1e3b3d0f5SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0+ 2ab4382d2SGreg Kroah-Hartman /* 3ab4382d2SGreg Kroah-Hartman * Driver core for serial ports 4ab4382d2SGreg Kroah-Hartman * 5ab4382d2SGreg Kroah-Hartman * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. 6ab4382d2SGreg Kroah-Hartman * 7ab4382d2SGreg Kroah-Hartman * Copyright 1999 ARM Limited 8ab4382d2SGreg Kroah-Hartman * Copyright (C) 2000-2001 Deep Blue Solutions Ltd. 9ab4382d2SGreg Kroah-Hartman */ 10ab4382d2SGreg Kroah-Hartman #include <linux/module.h> 11ab4382d2SGreg Kroah-Hartman #include <linux/tty.h> 12027d7dacSJiri Slaby #include <linux/tty_flip.h> 13ab4382d2SGreg Kroah-Hartman #include <linux/slab.h> 14174cd4b1SIngo Molnar #include <linux/sched/signal.h> 15ab4382d2SGreg Kroah-Hartman #include <linux/init.h> 16ab4382d2SGreg Kroah-Hartman #include <linux/console.h> 17167cbce2SJohan Hovold #include <linux/gpio/consumer.h> 18eff37b5eSIlpo Järvinen #include <linux/kernel.h> 19a208ffd2SGrant Likely #include <linux/of.h> 20ab4382d2SGreg Kroah-Hartman #include <linux/proc_fs.h> 21ab4382d2SGreg Kroah-Hartman #include <linux/seq_file.h> 22ab4382d2SGreg Kroah-Hartman #include <linux/device.h> 23ab4382d2SGreg Kroah-Hartman #include <linux/serial.h> /* for serial_state and serial_icounter_struct */ 24ab4382d2SGreg Kroah-Hartman #include <linux/serial_core.h> 2568af4317SDmitry Safonov #include <linux/sysrq.h> 26ab4382d2SGreg Kroah-Hartman #include <linux/delay.h> 27ab4382d2SGreg Kroah-Hartman #include <linux/mutex.h> 2831f6bd7fSIlpo Järvinen #include <linux/math64.h> 29794edf30SDavid Howells #include <linux/security.h> 30ab4382d2SGreg Kroah-Hartman 31aef3ad10SAndy Shevchenko #include <linux/irq.h> 327c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 33ab4382d2SGreg Kroah-Hartman 34ab4382d2SGreg Kroah-Hartman /* 35ab4382d2SGreg Kroah-Hartman * This is used to lock changes in serial line configuration. 36ab4382d2SGreg Kroah-Hartman */ 37ab4382d2SGreg Kroah-Hartman static DEFINE_MUTEX(port_mutex); 38ab4382d2SGreg Kroah-Hartman 39ab4382d2SGreg Kroah-Hartman /* 40ab4382d2SGreg Kroah-Hartman * lockdep: port->lock is initialized in two places, but we 41ab4382d2SGreg Kroah-Hartman * want only one lock-class: 42ab4382d2SGreg Kroah-Hartman */ 43ab4382d2SGreg Kroah-Hartman static struct lock_class_key port_lock_key; 44ab4382d2SGreg Kroah-Hartman 45ab4382d2SGreg Kroah-Hartman #define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8) 46ab4382d2SGreg Kroah-Hartman 470ed12afaSLino Sanfilippo /* 480ed12afaSLino Sanfilippo * Max time with active RTS before/after data is sent. 490ed12afaSLino Sanfilippo */ 500ed12afaSLino Sanfilippo #define RS485_MAX_RTS_DELAY 100 /* msecs */ 510ed12afaSLino Sanfilippo 526f538fe3SLinus Walleij static void uart_change_pm(struct uart_state *state, 536f538fe3SLinus Walleij enum uart_pm_state pm_state); 54ab4382d2SGreg Kroah-Hartman 55b922e19dSJiri Slaby static void uart_port_shutdown(struct tty_port *port); 56b922e19dSJiri Slaby 57299245a1SPeter Hurley static int uart_dcd_enabled(struct uart_port *uport) 58299245a1SPeter Hurley { 59d4260b51SPeter Hurley return !!(uport->status & UPSTAT_DCD_ENABLE); 60299245a1SPeter Hurley } 61299245a1SPeter Hurley 629ed19428SPeter Hurley static inline struct uart_port *uart_port_ref(struct uart_state *state) 639ed19428SPeter Hurley { 649ed19428SPeter Hurley if (atomic_add_unless(&state->refcount, 1, 0)) 659ed19428SPeter Hurley return state->uart_port; 669ed19428SPeter Hurley return NULL; 679ed19428SPeter Hurley } 689ed19428SPeter Hurley 699ed19428SPeter Hurley static inline void uart_port_deref(struct uart_port *uport) 709ed19428SPeter Hurley { 71ef510beaSAndy Shevchenko if (atomic_dec_and_test(&uport->state->refcount)) 729ed19428SPeter Hurley wake_up(&uport->state->remove_wait); 739ed19428SPeter Hurley } 749ed19428SPeter Hurley 759ed19428SPeter Hurley #define uart_port_lock(state, flags) \ 769ed19428SPeter Hurley ({ \ 779ed19428SPeter Hurley struct uart_port *__uport = uart_port_ref(state); \ 789ed19428SPeter Hurley if (__uport) \ 799ed19428SPeter Hurley spin_lock_irqsave(&__uport->lock, flags); \ 809ed19428SPeter Hurley __uport; \ 819ed19428SPeter Hurley }) 829ed19428SPeter Hurley 839ed19428SPeter Hurley #define uart_port_unlock(uport, flags) \ 849ed19428SPeter Hurley ({ \ 859ed19428SPeter Hurley struct uart_port *__uport = uport; \ 86ef510beaSAndy Shevchenko if (__uport) { \ 879ed19428SPeter Hurley spin_unlock_irqrestore(&__uport->lock, flags); \ 889ed19428SPeter Hurley uart_port_deref(__uport); \ 89ef510beaSAndy Shevchenko } \ 909ed19428SPeter Hurley }) 919ed19428SPeter Hurley 924047b371SPeter Hurley static inline struct uart_port *uart_port_check(struct uart_state *state) 934047b371SPeter Hurley { 947da4b8b7SPeter Hurley lockdep_assert_held(&state->port.mutex); 954047b371SPeter Hurley return state->uart_port; 964047b371SPeter Hurley } 974047b371SPeter Hurley 98c4bd17a6SJiri Slaby /** 99c4bd17a6SJiri Slaby * uart_write_wakeup - schedule write processing 100c4bd17a6SJiri Slaby * @port: port to be processed 101c4bd17a6SJiri Slaby * 102c4bd17a6SJiri Slaby * This routine is used by the interrupt handler to schedule processing in the 103c4bd17a6SJiri Slaby * software interrupt portion of the driver. A driver is expected to call this 104c4bd17a6SJiri Slaby * function when the number of characters in the transmit buffer have dropped 105c4bd17a6SJiri Slaby * below a threshold. 106c4bd17a6SJiri Slaby * 107c4bd17a6SJiri Slaby * Locking: @port->lock should be held 108ab4382d2SGreg Kroah-Hartman */ 109ab4382d2SGreg Kroah-Hartman void uart_write_wakeup(struct uart_port *port) 110ab4382d2SGreg Kroah-Hartman { 111ab4382d2SGreg Kroah-Hartman struct uart_state *state = port->state; 112ab4382d2SGreg Kroah-Hartman /* 113ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 114ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 115ab4382d2SGreg Kroah-Hartman */ 116ab4382d2SGreg Kroah-Hartman BUG_ON(!state); 117d0f4bce2SRob Herring tty_port_tty_wakeup(&state->port); 118ab4382d2SGreg Kroah-Hartman } 11915dc475bSJiri Slaby EXPORT_SYMBOL(uart_write_wakeup); 120ab4382d2SGreg Kroah-Hartman 121ab4382d2SGreg Kroah-Hartman static void uart_stop(struct tty_struct *tty) 122ab4382d2SGreg Kroah-Hartman { 123ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1249ed19428SPeter Hurley struct uart_port *port; 125ab4382d2SGreg Kroah-Hartman unsigned long flags; 126ab4382d2SGreg Kroah-Hartman 1279ed19428SPeter Hurley port = uart_port_lock(state, flags); 1289ed19428SPeter Hurley if (port) 129ab4382d2SGreg Kroah-Hartman port->ops->stop_tx(port); 1309ed19428SPeter Hurley uart_port_unlock(port, flags); 131ab4382d2SGreg Kroah-Hartman } 132ab4382d2SGreg Kroah-Hartman 133ab4382d2SGreg Kroah-Hartman static void __uart_start(struct tty_struct *tty) 134ab4382d2SGreg Kroah-Hartman { 135ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 136ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 137ab4382d2SGreg Kroah-Hartman 1389ed19428SPeter Hurley if (port && !uart_tx_stopped(port)) 139ab4382d2SGreg Kroah-Hartman port->ops->start_tx(port); 140ab4382d2SGreg Kroah-Hartman } 141ab4382d2SGreg Kroah-Hartman 142ab4382d2SGreg Kroah-Hartman static void uart_start(struct tty_struct *tty) 143ab4382d2SGreg Kroah-Hartman { 144ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1459ed19428SPeter Hurley struct uart_port *port; 146ab4382d2SGreg Kroah-Hartman unsigned long flags; 147ab4382d2SGreg Kroah-Hartman 1489ed19428SPeter Hurley port = uart_port_lock(state, flags); 149ab4382d2SGreg Kroah-Hartman __uart_start(tty); 1509ed19428SPeter Hurley uart_port_unlock(port, flags); 151ab4382d2SGreg Kroah-Hartman } 152ab4382d2SGreg Kroah-Hartman 153f4581cabSDenys Vlasenko static void 154ab4382d2SGreg Kroah-Hartman uart_update_mctrl(struct uart_port *port, unsigned int set, unsigned int clear) 155ab4382d2SGreg Kroah-Hartman { 156ab4382d2SGreg Kroah-Hartman unsigned long flags; 157ab4382d2SGreg Kroah-Hartman unsigned int old; 158ab4382d2SGreg Kroah-Hartman 159ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 160ab4382d2SGreg Kroah-Hartman old = port->mctrl; 161ab4382d2SGreg Kroah-Hartman port->mctrl = (old & ~clear) | set; 1627c7f9bc9SLukas Wunner if (old != port->mctrl && !(port->rs485.flags & SER_RS485_ENABLED)) 163ab4382d2SGreg Kroah-Hartman port->ops->set_mctrl(port, port->mctrl); 164ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 165ab4382d2SGreg Kroah-Hartman } 166ab4382d2SGreg Kroah-Hartman 167ab4382d2SGreg Kroah-Hartman #define uart_set_mctrl(port, set) uart_update_mctrl(port, set, 0) 168ab4382d2SGreg Kroah-Hartman #define uart_clear_mctrl(port, clear) uart_update_mctrl(port, 0, clear) 169ab4382d2SGreg Kroah-Hartman 1705701cb8bSIlpo Järvinen static void uart_port_dtr_rts(struct uart_port *uport, bool active) 171a6845e1eSRafael Gago { 1725701cb8bSIlpo Järvinen if (active) 173a6845e1eSRafael Gago uart_set_mctrl(uport, TIOCM_DTR | TIOCM_RTS); 1742dd8a74fSLukas Wunner else 1752dd8a74fSLukas Wunner uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); 176a6845e1eSRafael Gago } 177a6845e1eSRafael Gago 1788e90cf29SIlpo Järvinen /* Caller holds port mutex */ 179826736a6SIlpo Järvinen static void uart_change_line_settings(struct tty_struct *tty, struct uart_state *state, 1808e90cf29SIlpo Järvinen const struct ktermios *old_termios) 1818e90cf29SIlpo Järvinen { 1828e90cf29SIlpo Järvinen struct uart_port *uport = uart_port_check(state); 1838e90cf29SIlpo Järvinen struct ktermios *termios; 1841690ca51SIlpo Järvinen bool old_hw_stopped; 1858e90cf29SIlpo Järvinen 1868e90cf29SIlpo Järvinen /* 1878e90cf29SIlpo Järvinen * If we have no tty, termios, or the port does not exist, 1888e90cf29SIlpo Järvinen * then we can't set the parameters for this port. 1898e90cf29SIlpo Järvinen */ 1908e90cf29SIlpo Järvinen if (!tty || uport->type == PORT_UNKNOWN) 1918e90cf29SIlpo Järvinen return; 1928e90cf29SIlpo Järvinen 1938e90cf29SIlpo Järvinen termios = &tty->termios; 1948e90cf29SIlpo Järvinen uport->ops->set_termios(uport, termios, old_termios); 1958e90cf29SIlpo Järvinen 1968e90cf29SIlpo Järvinen /* 1978e90cf29SIlpo Järvinen * Set modem status enables based on termios cflag 1988e90cf29SIlpo Järvinen */ 1998e90cf29SIlpo Järvinen spin_lock_irq(&uport->lock); 2008e90cf29SIlpo Järvinen if (termios->c_cflag & CRTSCTS) 2018e90cf29SIlpo Järvinen uport->status |= UPSTAT_CTS_ENABLE; 2028e90cf29SIlpo Järvinen else 2038e90cf29SIlpo Järvinen uport->status &= ~UPSTAT_CTS_ENABLE; 2048e90cf29SIlpo Järvinen 2058e90cf29SIlpo Järvinen if (termios->c_cflag & CLOCAL) 2068e90cf29SIlpo Järvinen uport->status &= ~UPSTAT_DCD_ENABLE; 2078e90cf29SIlpo Järvinen else 2088e90cf29SIlpo Järvinen uport->status |= UPSTAT_DCD_ENABLE; 2098e90cf29SIlpo Järvinen 2108e90cf29SIlpo Järvinen /* reset sw-assisted CTS flow control based on (possibly) new mode */ 2111690ca51SIlpo Järvinen old_hw_stopped = uport->hw_stopped; 2128e90cf29SIlpo Järvinen uport->hw_stopped = uart_softcts_mode(uport) && 2138e90cf29SIlpo Järvinen !(uport->ops->get_mctrl(uport) & TIOCM_CTS); 2141690ca51SIlpo Järvinen if (uport->hw_stopped != old_hw_stopped) { 2151690ca51SIlpo Järvinen if (!old_hw_stopped) 2168e90cf29SIlpo Järvinen uport->ops->stop_tx(uport); 2171690ca51SIlpo Järvinen else 2188e90cf29SIlpo Järvinen __uart_start(tty); 2198e90cf29SIlpo Järvinen } 2208e90cf29SIlpo Järvinen spin_unlock_irq(&uport->lock); 2218e90cf29SIlpo Järvinen } 2228e90cf29SIlpo Järvinen 223ab4382d2SGreg Kroah-Hartman /* 224ab4382d2SGreg Kroah-Hartman * Startup the port. This will be called once per open. All calls 225ab4382d2SGreg Kroah-Hartman * will be serialised by the per-port mutex. 226ab4382d2SGreg Kroah-Hartman */ 227c0d92be6SJiri Slaby static int uart_port_startup(struct tty_struct *tty, struct uart_state *state, 228dcd794c6SIlpo Järvinen bool init_hw) 229ab4382d2SGreg Kroah-Hartman { 2304047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 23118ee37e1SJohan Hovold unsigned long flags; 232ab4382d2SGreg Kroah-Hartman unsigned long page; 233ab4382d2SGreg Kroah-Hartman int retval = 0; 234ab4382d2SGreg Kroah-Hartman 235ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) 236c0d92be6SJiri Slaby return 1; 237ab4382d2SGreg Kroah-Hartman 238ab4382d2SGreg Kroah-Hartman /* 2397deb39edSThomas Pfaff * Make sure the device is in D0 state. 2407deb39edSThomas Pfaff */ 2417deb39edSThomas Pfaff uart_change_pm(state, UART_PM_STATE_ON); 2427deb39edSThomas Pfaff 2437deb39edSThomas Pfaff /* 244ab4382d2SGreg Kroah-Hartman * Initialise and allocate the transmit and temporary 245ab4382d2SGreg Kroah-Hartman * buffer. 246ab4382d2SGreg Kroah-Hartman */ 247ab4382d2SGreg Kroah-Hartman page = get_zeroed_page(GFP_KERNEL); 248ab4382d2SGreg Kroah-Hartman if (!page) 249ab4382d2SGreg Kroah-Hartman return -ENOMEM; 250ab4382d2SGreg Kroah-Hartman 251a5ba1d95STycho Andersen uart_port_lock(state, flags); 252a5ba1d95STycho Andersen if (!state->xmit.buf) { 253ab4382d2SGreg Kroah-Hartman state->xmit.buf = (unsigned char *) page; 254ab4382d2SGreg Kroah-Hartman uart_circ_clear(&state->xmit); 255d7240214SSergey Senozhatsky uart_port_unlock(uport, flags); 256a5ba1d95STycho Andersen } else { 257d7240214SSergey Senozhatsky uart_port_unlock(uport, flags); 258d7240214SSergey Senozhatsky /* 259d7240214SSergey Senozhatsky * Do not free() the page under the port lock, see 260d7240214SSergey Senozhatsky * uart_shutdown(). 261d7240214SSergey Senozhatsky */ 262a5ba1d95STycho Andersen free_page(page); 263ab4382d2SGreg Kroah-Hartman } 264ab4382d2SGreg Kroah-Hartman 265ab4382d2SGreg Kroah-Hartman retval = uport->ops->startup(uport); 266ab4382d2SGreg Kroah-Hartman if (retval == 0) { 267c7d7abffSJiri Slaby if (uart_console(uport) && uport->cons->cflag) { 268adc8d746SAlan Cox tty->termios.c_cflag = uport->cons->cflag; 269027b5717SPali Rohár tty->termios.c_ispeed = uport->cons->ispeed; 270027b5717SPali Rohár tty->termios.c_ospeed = uport->cons->ospeed; 271c7d7abffSJiri Slaby uport->cons->cflag = 0; 272027b5717SPali Rohár uport->cons->ispeed = 0; 273027b5717SPali Rohár uport->cons->ospeed = 0; 274c7d7abffSJiri Slaby } 275ab4382d2SGreg Kroah-Hartman /* 276ab4382d2SGreg Kroah-Hartman * Initialise the hardware port settings. 277ab4382d2SGreg Kroah-Hartman */ 278826736a6SIlpo Järvinen uart_change_line_settings(tty, state, NULL); 279ab4382d2SGreg Kroah-Hartman 280ab4382d2SGreg Kroah-Hartman /* 281ab4382d2SGreg Kroah-Hartman * Setup the RTS and DTR signals once the 282ab4382d2SGreg Kroah-Hartman * port is open and ready to respond. 283ab4382d2SGreg Kroah-Hartman */ 2849db276f8SPeter Hurley if (init_hw && C_BAUD(tty)) 2855d420399SIlpo Järvinen uart_port_dtr_rts(uport, true); 286ab4382d2SGreg Kroah-Hartman } 287ab4382d2SGreg Kroah-Hartman 2880055197eSJiri Slaby /* 2890055197eSJiri Slaby * This is to allow setserial on this port. People may want to set 2900055197eSJiri Slaby * port/irq/type and then reconfigure the port properly if it failed 2910055197eSJiri Slaby * now. 2920055197eSJiri Slaby */ 293ab4382d2SGreg Kroah-Hartman if (retval && capable(CAP_SYS_ADMIN)) 294c0d92be6SJiri Slaby return 1; 295c0d92be6SJiri Slaby 296c0d92be6SJiri Slaby return retval; 297c0d92be6SJiri Slaby } 298c0d92be6SJiri Slaby 299c0d92be6SJiri Slaby static int uart_startup(struct tty_struct *tty, struct uart_state *state, 300dcd794c6SIlpo Järvinen bool init_hw) 301c0d92be6SJiri Slaby { 302c0d92be6SJiri Slaby struct tty_port *port = &state->port; 303c0d92be6SJiri Slaby int retval; 304c0d92be6SJiri Slaby 305d41861caSPeter Hurley if (tty_port_initialized(port)) 306c0d92be6SJiri Slaby return 0; 307c0d92be6SJiri Slaby 308c0d92be6SJiri Slaby retval = uart_port_startup(tty, state, init_hw); 309b3b57646SRob Herring if (retval) 310b3b57646SRob Herring set_bit(TTY_IO_ERROR, &tty->flags); 311ab4382d2SGreg Kroah-Hartman 312ab4382d2SGreg Kroah-Hartman return retval; 313ab4382d2SGreg Kroah-Hartman } 314ab4382d2SGreg Kroah-Hartman 315ab4382d2SGreg Kroah-Hartman /* 316ab4382d2SGreg Kroah-Hartman * This routine will shutdown a serial port; interrupts are disabled, and 317ab4382d2SGreg Kroah-Hartman * DTR is dropped if the hangup on close termio flag is on. Calls to 318ab4382d2SGreg Kroah-Hartman * uart_shutdown are serialised by the per-port semaphore. 319af224ca2SPeter Hurley * 320af224ca2SPeter Hurley * uport == NULL if uart_port has already been removed 321ab4382d2SGreg Kroah-Hartman */ 322ab4382d2SGreg Kroah-Hartman static void uart_shutdown(struct tty_struct *tty, struct uart_state *state) 323ab4382d2SGreg Kroah-Hartman { 3244047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 325ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 32618ee37e1SJohan Hovold unsigned long flags; 327d7240214SSergey Senozhatsky char *xmit_buf = NULL; 328ab4382d2SGreg Kroah-Hartman 329ab4382d2SGreg Kroah-Hartman /* 330ab4382d2SGreg Kroah-Hartman * Set the TTY IO error marker 331ab4382d2SGreg Kroah-Hartman */ 332ab4382d2SGreg Kroah-Hartman if (tty) 333ab4382d2SGreg Kroah-Hartman set_bit(TTY_IO_ERROR, &tty->flags); 334ab4382d2SGreg Kroah-Hartman 335d41861caSPeter Hurley if (tty_port_initialized(port)) { 336515be7baSIlpo Järvinen tty_port_set_initialized(port, false); 337d41861caSPeter Hurley 338ab4382d2SGreg Kroah-Hartman /* 339ab4382d2SGreg Kroah-Hartman * Turn off DTR and RTS early. 340ab4382d2SGreg Kroah-Hartman */ 341027b5717SPali Rohár if (uport && uart_console(uport) && tty) { 342ae84db96SPeter Hurley uport->cons->cflag = tty->termios.c_cflag; 343027b5717SPali Rohár uport->cons->ispeed = tty->termios.c_ispeed; 344027b5717SPali Rohár uport->cons->ospeed = tty->termios.c_ospeed; 345027b5717SPali Rohár } 346ae84db96SPeter Hurley 3479db276f8SPeter Hurley if (!tty || C_HUPCL(tty)) 3485d420399SIlpo Järvinen uart_port_dtr_rts(uport, false); 349ab4382d2SGreg Kroah-Hartman 350b922e19dSJiri Slaby uart_port_shutdown(port); 351ab4382d2SGreg Kroah-Hartman } 352ab4382d2SGreg Kroah-Hartman 353ab4382d2SGreg Kroah-Hartman /* 354d208a3bfSDoug Anderson * It's possible for shutdown to be called after suspend if we get 355d208a3bfSDoug Anderson * a DCD drop (hangup) at just the right time. Clear suspended bit so 356d208a3bfSDoug Anderson * we don't try to resume a port that has been shutdown. 357ab4382d2SGreg Kroah-Hartman */ 35875b20a2aSIlpo Järvinen tty_port_set_suspended(port, false); 359ab4382d2SGreg Kroah-Hartman 360ab4382d2SGreg Kroah-Hartman /* 361d7240214SSergey Senozhatsky * Do not free() the transmit buffer page under the port lock since 362d7240214SSergey Senozhatsky * this can create various circular locking scenarios. For instance, 363d7240214SSergey Senozhatsky * console driver may need to allocate/free a debug object, which 364d7240214SSergey Senozhatsky * can endup in printk() recursion. 365ab4382d2SGreg Kroah-Hartman */ 366a5ba1d95STycho Andersen uart_port_lock(state, flags); 367d7240214SSergey Senozhatsky xmit_buf = state->xmit.buf; 368ab4382d2SGreg Kroah-Hartman state->xmit.buf = NULL; 369a5ba1d95STycho Andersen uart_port_unlock(uport, flags); 370d7240214SSergey Senozhatsky 371d7240214SSergey Senozhatsky free_page((unsigned long)xmit_buf); 372ab4382d2SGreg Kroah-Hartman } 373ab4382d2SGreg Kroah-Hartman 374ab4382d2SGreg Kroah-Hartman /** 375c4bd17a6SJiri Slaby * uart_update_timeout - update per-port frame timing information 376ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port 377ab4382d2SGreg Kroah-Hartman * @cflag: termios cflag value 378ab4382d2SGreg Kroah-Hartman * @baud: speed of the port 379ab4382d2SGreg Kroah-Hartman * 380c4bd17a6SJiri Slaby * Set the @port frame timing information from which the FIFO timeout value is 381c4bd17a6SJiri Slaby * derived. The @cflag value should reflect the actual hardware settings as 382c4bd17a6SJiri Slaby * number of bits, parity, stop bits and baud rate is taken into account here. 383c4bd17a6SJiri Slaby * 384c4bd17a6SJiri Slaby * Locking: caller is expected to take @port->lock 385ab4382d2SGreg Kroah-Hartman */ 386ab4382d2SGreg Kroah-Hartman void 387ab4382d2SGreg Kroah-Hartman uart_update_timeout(struct uart_port *port, unsigned int cflag, 388ab4382d2SGreg Kroah-Hartman unsigned int baud) 389ab4382d2SGreg Kroah-Hartman { 39031f6bd7fSIlpo Järvinen unsigned int size = tty_get_frame_size(cflag); 39131f6bd7fSIlpo Järvinen u64 frame_time; 392ab4382d2SGreg Kroah-Hartman 39331f6bd7fSIlpo Järvinen frame_time = (u64)size * NSEC_PER_SEC; 39431f6bd7fSIlpo Järvinen port->frame_time = DIV64_U64_ROUND_UP(frame_time, baud); 395ab4382d2SGreg Kroah-Hartman } 396ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_update_timeout); 397ab4382d2SGreg Kroah-Hartman 398ab4382d2SGreg Kroah-Hartman /** 399ab4382d2SGreg Kroah-Hartman * uart_get_baud_rate - return baud rate for a particular port 400ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port in question. 401c4bd17a6SJiri Slaby * @termios: desired termios settings 402c4bd17a6SJiri Slaby * @old: old termios (or %NULL) 403ab4382d2SGreg Kroah-Hartman * @min: minimum acceptable baud rate 404ab4382d2SGreg Kroah-Hartman * @max: maximum acceptable baud rate 405ab4382d2SGreg Kroah-Hartman * 406c4bd17a6SJiri Slaby * Decode the termios structure into a numeric baud rate, taking account of the 407c4bd17a6SJiri Slaby * magic 38400 baud rate (with spd_* flags), and mapping the %B0 rate to 9600 408c4bd17a6SJiri Slaby * baud. 409ab4382d2SGreg Kroah-Hartman * 410c4bd17a6SJiri Slaby * If the new baud rate is invalid, try the @old termios setting. If it's still 411c4bd17a6SJiri Slaby * invalid, we try 9600 baud. 412ab4382d2SGreg Kroah-Hartman * 413c4bd17a6SJiri Slaby * The @termios structure is updated to reflect the baud rate we're actually 414c4bd17a6SJiri Slaby * going to be using. Don't do this for the case where B0 is requested ("hang 415c4bd17a6SJiri Slaby * up"). 416c4bd17a6SJiri Slaby * 417c4bd17a6SJiri Slaby * Locking: caller dependent 418ab4382d2SGreg Kroah-Hartman */ 419ab4382d2SGreg Kroah-Hartman unsigned int 420ab4382d2SGreg Kroah-Hartman uart_get_baud_rate(struct uart_port *port, struct ktermios *termios, 421bec5b814SIlpo Järvinen const struct ktermios *old, unsigned int min, unsigned int max) 422ab4382d2SGreg Kroah-Hartman { 423f10a2233SJoakim Nordell unsigned int try; 424f10a2233SJoakim Nordell unsigned int baud; 425f10a2233SJoakim Nordell unsigned int altbaud; 426ab4382d2SGreg Kroah-Hartman int hung_up = 0; 427ab4382d2SGreg Kroah-Hartman upf_t flags = port->flags & UPF_SPD_MASK; 428ab4382d2SGreg Kroah-Hartman 429f10a2233SJoakim Nordell switch (flags) { 430f10a2233SJoakim Nordell case UPF_SPD_HI: 431ab4382d2SGreg Kroah-Hartman altbaud = 57600; 432f10a2233SJoakim Nordell break; 433f10a2233SJoakim Nordell case UPF_SPD_VHI: 434ab4382d2SGreg Kroah-Hartman altbaud = 115200; 435f10a2233SJoakim Nordell break; 436f10a2233SJoakim Nordell case UPF_SPD_SHI: 437ab4382d2SGreg Kroah-Hartman altbaud = 230400; 438f10a2233SJoakim Nordell break; 439f10a2233SJoakim Nordell case UPF_SPD_WARP: 440ab4382d2SGreg Kroah-Hartman altbaud = 460800; 441f10a2233SJoakim Nordell break; 442f10a2233SJoakim Nordell default: 443f10a2233SJoakim Nordell altbaud = 38400; 444f10a2233SJoakim Nordell break; 445f10a2233SJoakim Nordell } 446ab4382d2SGreg Kroah-Hartman 447ab4382d2SGreg Kroah-Hartman for (try = 0; try < 2; try++) { 448ab4382d2SGreg Kroah-Hartman baud = tty_termios_baud_rate(termios); 449ab4382d2SGreg Kroah-Hartman 450ab4382d2SGreg Kroah-Hartman /* 451ab4382d2SGreg Kroah-Hartman * The spd_hi, spd_vhi, spd_shi, spd_warp kludge... 452ab4382d2SGreg Kroah-Hartman * Die! Die! Die! 453ab4382d2SGreg Kroah-Hartman */ 454547039ecSPeter Hurley if (try == 0 && baud == 38400) 455ab4382d2SGreg Kroah-Hartman baud = altbaud; 456ab4382d2SGreg Kroah-Hartman 457ab4382d2SGreg Kroah-Hartman /* 458ab4382d2SGreg Kroah-Hartman * Special case: B0 rate. 459ab4382d2SGreg Kroah-Hartman */ 460ab4382d2SGreg Kroah-Hartman if (baud == 0) { 461ab4382d2SGreg Kroah-Hartman hung_up = 1; 462ab4382d2SGreg Kroah-Hartman baud = 9600; 463ab4382d2SGreg Kroah-Hartman } 464ab4382d2SGreg Kroah-Hartman 465ab4382d2SGreg Kroah-Hartman if (baud >= min && baud <= max) 466ab4382d2SGreg Kroah-Hartman return baud; 467ab4382d2SGreg Kroah-Hartman 468ab4382d2SGreg Kroah-Hartman /* 469ab4382d2SGreg Kroah-Hartman * Oops, the quotient was zero. Try again with 470ab4382d2SGreg Kroah-Hartman * the old baud rate if possible. 471ab4382d2SGreg Kroah-Hartman */ 472ab4382d2SGreg Kroah-Hartman termios->c_cflag &= ~CBAUD; 473ab4382d2SGreg Kroah-Hartman if (old) { 474ab4382d2SGreg Kroah-Hartman baud = tty_termios_baud_rate(old); 475ab4382d2SGreg Kroah-Hartman if (!hung_up) 476ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 477ab4382d2SGreg Kroah-Hartman baud, baud); 478ab4382d2SGreg Kroah-Hartman old = NULL; 479ab4382d2SGreg Kroah-Hartman continue; 480ab4382d2SGreg Kroah-Hartman } 481ab4382d2SGreg Kroah-Hartman 482ab4382d2SGreg Kroah-Hartman /* 483ab4382d2SGreg Kroah-Hartman * As a last resort, if the range cannot be met then clip to 484ab4382d2SGreg Kroah-Hartman * the nearest chip supported rate. 485ab4382d2SGreg Kroah-Hartman */ 486ab4382d2SGreg Kroah-Hartman if (!hung_up) { 487ab4382d2SGreg Kroah-Hartman if (baud <= min) 488ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 489ab4382d2SGreg Kroah-Hartman min + 1, min + 1); 490ab4382d2SGreg Kroah-Hartman else 491ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 492ab4382d2SGreg Kroah-Hartman max - 1, max - 1); 493ab4382d2SGreg Kroah-Hartman } 494ab4382d2SGreg Kroah-Hartman } 495ab4382d2SGreg Kroah-Hartman /* Should never happen */ 496ab4382d2SGreg Kroah-Hartman WARN_ON(1); 497ab4382d2SGreg Kroah-Hartman return 0; 498ab4382d2SGreg Kroah-Hartman } 499ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_get_baud_rate); 500ab4382d2SGreg Kroah-Hartman 501ab4382d2SGreg Kroah-Hartman /** 502ab4382d2SGreg Kroah-Hartman * uart_get_divisor - return uart clock divisor 503c4bd17a6SJiri Slaby * @port: uart_port structure describing the port 504ab4382d2SGreg Kroah-Hartman * @baud: desired baud rate 505ab4382d2SGreg Kroah-Hartman * 506c4bd17a6SJiri Slaby * Calculate the divisor (baud_base / baud) for the specified @baud, 507c4bd17a6SJiri Slaby * appropriately rounded. 508c4bd17a6SJiri Slaby * 509c4bd17a6SJiri Slaby * If 38400 baud and custom divisor is selected, return the custom divisor 510c4bd17a6SJiri Slaby * instead. 511c4bd17a6SJiri Slaby * 512c4bd17a6SJiri Slaby * Locking: caller dependent 513ab4382d2SGreg Kroah-Hartman */ 514ab4382d2SGreg Kroah-Hartman unsigned int 515ab4382d2SGreg Kroah-Hartman uart_get_divisor(struct uart_port *port, unsigned int baud) 516ab4382d2SGreg Kroah-Hartman { 517ab4382d2SGreg Kroah-Hartman unsigned int quot; 518ab4382d2SGreg Kroah-Hartman 519ab4382d2SGreg Kroah-Hartman /* 520ab4382d2SGreg Kroah-Hartman * Old custom speed handling. 521ab4382d2SGreg Kroah-Hartman */ 522ab4382d2SGreg Kroah-Hartman if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) 523ab4382d2SGreg Kroah-Hartman quot = port->custom_divisor; 524ab4382d2SGreg Kroah-Hartman else 52597d24634SUwe Kleine-König quot = DIV_ROUND_CLOSEST(port->uartclk, 16 * baud); 526ab4382d2SGreg Kroah-Hartman 527ab4382d2SGreg Kroah-Hartman return quot; 528ab4382d2SGreg Kroah-Hartman } 529ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_get_divisor); 530ab4382d2SGreg Kroah-Hartman 531f5291eccSPeter Hurley static int uart_put_char(struct tty_struct *tty, unsigned char c) 532ab4382d2SGreg Kroah-Hartman { 533f5291eccSPeter Hurley struct uart_state *state = tty->driver_data; 5349ed19428SPeter Hurley struct uart_port *port; 535f5291eccSPeter Hurley struct circ_buf *circ; 536ab4382d2SGreg Kroah-Hartman unsigned long flags; 537ab4382d2SGreg Kroah-Hartman int ret = 0; 538ab4382d2SGreg Kroah-Hartman 539f5291eccSPeter Hurley circ = &state->xmit; 5409ed19428SPeter Hurley port = uart_port_lock(state, flags); 541aff9cf59SSamir Virmani if (!circ->buf) { 542aff9cf59SSamir Virmani uart_port_unlock(port, flags); 543aff9cf59SSamir Virmani return 0; 544aff9cf59SSamir Virmani } 545aff9cf59SSamir Virmani 5469ed19428SPeter Hurley if (port && uart_circ_chars_free(circ) != 0) { 547ab4382d2SGreg Kroah-Hartman circ->buf[circ->head] = c; 548ab4382d2SGreg Kroah-Hartman circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1); 549ab4382d2SGreg Kroah-Hartman ret = 1; 550ab4382d2SGreg Kroah-Hartman } 5519ed19428SPeter Hurley uart_port_unlock(port, flags); 552ab4382d2SGreg Kroah-Hartman return ret; 553ab4382d2SGreg Kroah-Hartman } 554ab4382d2SGreg Kroah-Hartman 555ab4382d2SGreg Kroah-Hartman static void uart_flush_chars(struct tty_struct *tty) 556ab4382d2SGreg Kroah-Hartman { 557ab4382d2SGreg Kroah-Hartman uart_start(tty); 558ab4382d2SGreg Kroah-Hartman } 559ab4382d2SGreg Kroah-Hartman 560ab4382d2SGreg Kroah-Hartman static int uart_write(struct tty_struct *tty, 561ab4382d2SGreg Kroah-Hartman const unsigned char *buf, int count) 562ab4382d2SGreg Kroah-Hartman { 563ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 564ab4382d2SGreg Kroah-Hartman struct uart_port *port; 565ab4382d2SGreg Kroah-Hartman struct circ_buf *circ; 566ab4382d2SGreg Kroah-Hartman unsigned long flags; 567ab4382d2SGreg Kroah-Hartman int c, ret = 0; 568ab4382d2SGreg Kroah-Hartman 569ab4382d2SGreg Kroah-Hartman /* 570ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 571ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 572ab4382d2SGreg Kroah-Hartman */ 573ab4382d2SGreg Kroah-Hartman if (!state) { 574ab4382d2SGreg Kroah-Hartman WARN_ON(1); 575ab4382d2SGreg Kroah-Hartman return -EL3HLT; 576ab4382d2SGreg Kroah-Hartman } 577ab4382d2SGreg Kroah-Hartman 5789ed19428SPeter Hurley port = uart_port_lock(state, flags); 579aff9cf59SSamir Virmani circ = &state->xmit; 580aff9cf59SSamir Virmani if (!circ->buf) { 581aff9cf59SSamir Virmani uart_port_unlock(port, flags); 582aff9cf59SSamir Virmani return 0; 583aff9cf59SSamir Virmani } 584aff9cf59SSamir Virmani 5859ed19428SPeter Hurley while (port) { 586ab4382d2SGreg Kroah-Hartman c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE); 587ab4382d2SGreg Kroah-Hartman if (count < c) 588ab4382d2SGreg Kroah-Hartman c = count; 589ab4382d2SGreg Kroah-Hartman if (c <= 0) 590ab4382d2SGreg Kroah-Hartman break; 591ab4382d2SGreg Kroah-Hartman memcpy(circ->buf + circ->head, buf, c); 592ab4382d2SGreg Kroah-Hartman circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1); 593ab4382d2SGreg Kroah-Hartman buf += c; 594ab4382d2SGreg Kroah-Hartman count -= c; 595ab4382d2SGreg Kroah-Hartman ret += c; 596ab4382d2SGreg Kroah-Hartman } 59764dbee31SPeter Hurley 59864dbee31SPeter Hurley __uart_start(tty); 5999ed19428SPeter Hurley uart_port_unlock(port, flags); 600ab4382d2SGreg Kroah-Hartman return ret; 601ab4382d2SGreg Kroah-Hartman } 602ab4382d2SGreg Kroah-Hartman 60303b3b1a2SJiri Slaby static unsigned int uart_write_room(struct tty_struct *tty) 604ab4382d2SGreg Kroah-Hartman { 605ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 6069ed19428SPeter Hurley struct uart_port *port; 607ab4382d2SGreg Kroah-Hartman unsigned long flags; 60803b3b1a2SJiri Slaby unsigned int ret; 609ab4382d2SGreg Kroah-Hartman 6109ed19428SPeter Hurley port = uart_port_lock(state, flags); 611ab4382d2SGreg Kroah-Hartman ret = uart_circ_chars_free(&state->xmit); 6129ed19428SPeter Hurley uart_port_unlock(port, flags); 613ab4382d2SGreg Kroah-Hartman return ret; 614ab4382d2SGreg Kroah-Hartman } 615ab4382d2SGreg Kroah-Hartman 616fff4ef17SJiri Slaby static unsigned int uart_chars_in_buffer(struct tty_struct *tty) 617ab4382d2SGreg Kroah-Hartman { 618ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 6199ed19428SPeter Hurley struct uart_port *port; 620ab4382d2SGreg Kroah-Hartman unsigned long flags; 621fff4ef17SJiri Slaby unsigned int ret; 622ab4382d2SGreg Kroah-Hartman 6239ed19428SPeter Hurley port = uart_port_lock(state, flags); 624ab4382d2SGreg Kroah-Hartman ret = uart_circ_chars_pending(&state->xmit); 6259ed19428SPeter Hurley uart_port_unlock(port, flags); 626ab4382d2SGreg Kroah-Hartman return ret; 627ab4382d2SGreg Kroah-Hartman } 628ab4382d2SGreg Kroah-Hartman 629ab4382d2SGreg Kroah-Hartman static void uart_flush_buffer(struct tty_struct *tty) 630ab4382d2SGreg Kroah-Hartman { 631ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 632ab4382d2SGreg Kroah-Hartman struct uart_port *port; 633ab4382d2SGreg Kroah-Hartman unsigned long flags; 634ab4382d2SGreg Kroah-Hartman 635ab4382d2SGreg Kroah-Hartman /* 636ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 637ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 638ab4382d2SGreg Kroah-Hartman */ 639ab4382d2SGreg Kroah-Hartman if (!state) { 640ab4382d2SGreg Kroah-Hartman WARN_ON(1); 641ab4382d2SGreg Kroah-Hartman return; 642ab4382d2SGreg Kroah-Hartman } 643ab4382d2SGreg Kroah-Hartman 644ab4382d2SGreg Kroah-Hartman pr_debug("uart_flush_buffer(%d) called\n", tty->index); 645ab4382d2SGreg Kroah-Hartman 6469ed19428SPeter Hurley port = uart_port_lock(state, flags); 6479ed19428SPeter Hurley if (!port) 6489ed19428SPeter Hurley return; 649ab4382d2SGreg Kroah-Hartman uart_circ_clear(&state->xmit); 650ab4382d2SGreg Kroah-Hartman if (port->ops->flush_buffer) 651ab4382d2SGreg Kroah-Hartman port->ops->flush_buffer(port); 6529ed19428SPeter Hurley uart_port_unlock(port, flags); 653d0f4bce2SRob Herring tty_port_tty_wakeup(&state->port); 654ab4382d2SGreg Kroah-Hartman } 655ab4382d2SGreg Kroah-Hartman 656ab4382d2SGreg Kroah-Hartman /* 657f58c252eSIlpo Järvinen * This function performs low-level write of high-priority XON/XOFF 658f58c252eSIlpo Järvinen * character and accounting for it. 659f58c252eSIlpo Järvinen * 660f58c252eSIlpo Järvinen * Requires uart_port to implement .serial_out(). 661f58c252eSIlpo Järvinen */ 662f58c252eSIlpo Järvinen void uart_xchar_out(struct uart_port *uport, int offset) 663f58c252eSIlpo Järvinen { 664f58c252eSIlpo Järvinen serial_port_out(uport, offset, uport->x_char); 665f58c252eSIlpo Järvinen uport->icount.tx++; 666f58c252eSIlpo Järvinen uport->x_char = 0; 667f58c252eSIlpo Järvinen } 668f58c252eSIlpo Järvinen EXPORT_SYMBOL_GPL(uart_xchar_out); 669f58c252eSIlpo Järvinen 670f58c252eSIlpo Järvinen /* 671ab4382d2SGreg Kroah-Hartman * This function is used to send a high-priority XON/XOFF character to 672ab4382d2SGreg Kroah-Hartman * the device 673ab4382d2SGreg Kroah-Hartman */ 674ab4382d2SGreg Kroah-Hartman static void uart_send_xchar(struct tty_struct *tty, char ch) 675ab4382d2SGreg Kroah-Hartman { 676ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 6779ed19428SPeter Hurley struct uart_port *port; 678ab4382d2SGreg Kroah-Hartman unsigned long flags; 679ab4382d2SGreg Kroah-Hartman 6809ed19428SPeter Hurley port = uart_port_ref(state); 6819ed19428SPeter Hurley if (!port) 6829ed19428SPeter Hurley return; 6839ed19428SPeter Hurley 684ab4382d2SGreg Kroah-Hartman if (port->ops->send_xchar) 685ab4382d2SGreg Kroah-Hartman port->ops->send_xchar(port, ch); 686ab4382d2SGreg Kroah-Hartman else { 687ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 688c235ccc1SPeter Hurley port->x_char = ch; 689c235ccc1SPeter Hurley if (ch) 690ab4382d2SGreg Kroah-Hartman port->ops->start_tx(port); 691ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 692ab4382d2SGreg Kroah-Hartman } 6939ed19428SPeter Hurley uart_port_deref(port); 694ab4382d2SGreg Kroah-Hartman } 695ab4382d2SGreg Kroah-Hartman 696ab4382d2SGreg Kroah-Hartman static void uart_throttle(struct tty_struct *tty) 697ab4382d2SGreg Kroah-Hartman { 698ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 699c5f78b1fSJeremy Kerr upstat_t mask = UPSTAT_SYNC_FIFO; 7009ed19428SPeter Hurley struct uart_port *port; 701ab4382d2SGreg Kroah-Hartman 7029ed19428SPeter Hurley port = uart_port_ref(state); 7039ed19428SPeter Hurley if (!port) 7049ed19428SPeter Hurley return; 7059ed19428SPeter Hurley 706ab4382d2SGreg Kroah-Hartman if (I_IXOFF(tty)) 707391f93f2SPeter Hurley mask |= UPSTAT_AUTOXOFF; 7089db276f8SPeter Hurley if (C_CRTSCTS(tty)) 709391f93f2SPeter Hurley mask |= UPSTAT_AUTORTS; 7109aba8d5bSRussell King 711391f93f2SPeter Hurley if (port->status & mask) { 7129aba8d5bSRussell King port->ops->throttle(port); 713391f93f2SPeter Hurley mask &= ~port->status; 7149aba8d5bSRussell King } 7159aba8d5bSRussell King 716391f93f2SPeter Hurley if (mask & UPSTAT_AUTORTS) 7179aba8d5bSRussell King uart_clear_mctrl(port, TIOCM_RTS); 718b4749b97SPeter Hurley 719b4749b97SPeter Hurley if (mask & UPSTAT_AUTOXOFF) 720b4749b97SPeter Hurley uart_send_xchar(tty, STOP_CHAR(tty)); 7219ed19428SPeter Hurley 7229ed19428SPeter Hurley uart_port_deref(port); 723ab4382d2SGreg Kroah-Hartman } 724ab4382d2SGreg Kroah-Hartman 725ab4382d2SGreg Kroah-Hartman static void uart_unthrottle(struct tty_struct *tty) 726ab4382d2SGreg Kroah-Hartman { 727ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 728c5f78b1fSJeremy Kerr upstat_t mask = UPSTAT_SYNC_FIFO; 7299ed19428SPeter Hurley struct uart_port *port; 730ab4382d2SGreg Kroah-Hartman 7319ed19428SPeter Hurley port = uart_port_ref(state); 7329ed19428SPeter Hurley if (!port) 7339ed19428SPeter Hurley return; 7349ed19428SPeter Hurley 7359aba8d5bSRussell King if (I_IXOFF(tty)) 736391f93f2SPeter Hurley mask |= UPSTAT_AUTOXOFF; 7379db276f8SPeter Hurley if (C_CRTSCTS(tty)) 738391f93f2SPeter Hurley mask |= UPSTAT_AUTORTS; 7399aba8d5bSRussell King 740391f93f2SPeter Hurley if (port->status & mask) { 7419aba8d5bSRussell King port->ops->unthrottle(port); 742391f93f2SPeter Hurley mask &= ~port->status; 7439aba8d5bSRussell King } 7449aba8d5bSRussell King 745391f93f2SPeter Hurley if (mask & UPSTAT_AUTORTS) 746ab4382d2SGreg Kroah-Hartman uart_set_mctrl(port, TIOCM_RTS); 747b4749b97SPeter Hurley 748b4749b97SPeter Hurley if (mask & UPSTAT_AUTOXOFF) 749b4749b97SPeter Hurley uart_send_xchar(tty, START_CHAR(tty)); 7509ed19428SPeter Hurley 7519ed19428SPeter Hurley uart_port_deref(port); 752ab4382d2SGreg Kroah-Hartman } 753ab4382d2SGreg Kroah-Hartman 7544047b371SPeter Hurley static int uart_get_info(struct tty_port *port, struct serial_struct *retinfo) 755ab4382d2SGreg Kroah-Hartman { 7569f109694SAlan Cox struct uart_state *state = container_of(port, struct uart_state, port); 7574047b371SPeter Hurley struct uart_port *uport; 7584047b371SPeter Hurley int ret = -ENODEV; 7597ba2e769SAlan Cox 7603abe8c76SPeter Hurley /* 7613abe8c76SPeter Hurley * Ensure the state we copy is consistent and no hardware changes 7623abe8c76SPeter Hurley * occur as we go 7633abe8c76SPeter Hurley */ 7643abe8c76SPeter Hurley mutex_lock(&port->mutex); 7654047b371SPeter Hurley uport = uart_port_check(state); 7664047b371SPeter Hurley if (!uport) 7674047b371SPeter Hurley goto out; 7684047b371SPeter Hurley 7697ba2e769SAlan Cox retinfo->type = uport->type; 7707ba2e769SAlan Cox retinfo->line = uport->line; 7717ba2e769SAlan Cox retinfo->port = uport->iobase; 7727ba2e769SAlan Cox if (HIGH_BITS_OFFSET) 7737ba2e769SAlan Cox retinfo->port_high = (long) uport->iobase >> HIGH_BITS_OFFSET; 7747ba2e769SAlan Cox retinfo->irq = uport->irq; 775a17e74c5SAndy Shevchenko retinfo->flags = (__force int)uport->flags; 7767ba2e769SAlan Cox retinfo->xmit_fifo_size = uport->fifosize; 7777ba2e769SAlan Cox retinfo->baud_base = uport->uartclk / 16; 7787ba2e769SAlan Cox retinfo->close_delay = jiffies_to_msecs(port->close_delay) / 10; 7797ba2e769SAlan Cox retinfo->closing_wait = port->closing_wait == ASYNC_CLOSING_WAIT_NONE ? 7807ba2e769SAlan Cox ASYNC_CLOSING_WAIT_NONE : 7817ba2e769SAlan Cox jiffies_to_msecs(port->closing_wait) / 10; 7827ba2e769SAlan Cox retinfo->custom_divisor = uport->custom_divisor; 7837ba2e769SAlan Cox retinfo->hub6 = uport->hub6; 7847ba2e769SAlan Cox retinfo->io_type = uport->iotype; 7857ba2e769SAlan Cox retinfo->iomem_reg_shift = uport->regshift; 7867ba2e769SAlan Cox retinfo->iomem_base = (void *)(unsigned long)uport->mapbase; 7874047b371SPeter Hurley 7884047b371SPeter Hurley ret = 0; 7894047b371SPeter Hurley out: 790ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 7914047b371SPeter Hurley return ret; 7929f109694SAlan Cox } 7939f109694SAlan Cox 7945099d234SAl Viro static int uart_get_info_user(struct tty_struct *tty, 7955099d234SAl Viro struct serial_struct *ss) 7969f109694SAlan Cox { 7975099d234SAl Viro struct uart_state *state = tty->driver_data; 7985099d234SAl Viro struct tty_port *port = &state->port; 7993abe8c76SPeter Hurley 8005099d234SAl Viro return uart_get_info(port, ss) < 0 ? -EIO : 0; 801ab4382d2SGreg Kroah-Hartman } 802ab4382d2SGreg Kroah-Hartman 8037ba2e769SAlan Cox static int uart_set_info(struct tty_struct *tty, struct tty_port *port, 8047ba2e769SAlan Cox struct uart_state *state, 8057ba2e769SAlan Cox struct serial_struct *new_info) 806ab4382d2SGreg Kroah-Hartman { 8074047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 808ab4382d2SGreg Kroah-Hartman unsigned long new_port; 809ab4382d2SGreg Kroah-Hartman unsigned int change_irq, change_port, closing_wait; 810ab4382d2SGreg Kroah-Hartman unsigned int old_custom_divisor, close_delay; 811ab4382d2SGreg Kroah-Hartman upf_t old_flags, new_flags; 812ab4382d2SGreg Kroah-Hartman int retval = 0; 813ab4382d2SGreg Kroah-Hartman 8144047b371SPeter Hurley if (!uport) 8154047b371SPeter Hurley return -EIO; 8164047b371SPeter Hurley 8177ba2e769SAlan Cox new_port = new_info->port; 818ab4382d2SGreg Kroah-Hartman if (HIGH_BITS_OFFSET) 8197ba2e769SAlan Cox new_port += (unsigned long) new_info->port_high << HIGH_BITS_OFFSET; 820ab4382d2SGreg Kroah-Hartman 8217ba2e769SAlan Cox new_info->irq = irq_canonicalize(new_info->irq); 8227ba2e769SAlan Cox close_delay = msecs_to_jiffies(new_info->close_delay * 10); 8237ba2e769SAlan Cox closing_wait = new_info->closing_wait == ASYNC_CLOSING_WAIT_NONE ? 8244cb0fbfdSJiri Slaby ASYNC_CLOSING_WAIT_NONE : 8257ba2e769SAlan Cox msecs_to_jiffies(new_info->closing_wait * 10); 826ab4382d2SGreg Kroah-Hartman 827ab4382d2SGreg Kroah-Hartman 828ab4382d2SGreg Kroah-Hartman change_irq = !(uport->flags & UPF_FIXED_PORT) 8297ba2e769SAlan Cox && new_info->irq != uport->irq; 830ab4382d2SGreg Kroah-Hartman 831ab4382d2SGreg Kroah-Hartman /* 832ab4382d2SGreg Kroah-Hartman * Since changing the 'type' of the port changes its resource 833ab4382d2SGreg Kroah-Hartman * allocations, we should treat type changes the same as 834ab4382d2SGreg Kroah-Hartman * IO port changes. 835ab4382d2SGreg Kroah-Hartman */ 836ab4382d2SGreg Kroah-Hartman change_port = !(uport->flags & UPF_FIXED_PORT) 837ab4382d2SGreg Kroah-Hartman && (new_port != uport->iobase || 8387ba2e769SAlan Cox (unsigned long)new_info->iomem_base != uport->mapbase || 8397ba2e769SAlan Cox new_info->hub6 != uport->hub6 || 8407ba2e769SAlan Cox new_info->io_type != uport->iotype || 8417ba2e769SAlan Cox new_info->iomem_reg_shift != uport->regshift || 8427ba2e769SAlan Cox new_info->type != uport->type); 843ab4382d2SGreg Kroah-Hartman 844ab4382d2SGreg Kroah-Hartman old_flags = uport->flags; 845a17e74c5SAndy Shevchenko new_flags = (__force upf_t)new_info->flags; 846ab4382d2SGreg Kroah-Hartman old_custom_divisor = uport->custom_divisor; 847ab4382d2SGreg Kroah-Hartman 848ab4382d2SGreg Kroah-Hartman if (!capable(CAP_SYS_ADMIN)) { 849ab4382d2SGreg Kroah-Hartman retval = -EPERM; 850ab4382d2SGreg Kroah-Hartman if (change_irq || change_port || 8517ba2e769SAlan Cox (new_info->baud_base != uport->uartclk / 16) || 852ab4382d2SGreg Kroah-Hartman (close_delay != port->close_delay) || 853ab4382d2SGreg Kroah-Hartman (closing_wait != port->closing_wait) || 8547ba2e769SAlan Cox (new_info->xmit_fifo_size && 8557ba2e769SAlan Cox new_info->xmit_fifo_size != uport->fifosize) || 856ab4382d2SGreg Kroah-Hartman (((new_flags ^ old_flags) & ~UPF_USR_MASK) != 0)) 857ab4382d2SGreg Kroah-Hartman goto exit; 858ab4382d2SGreg Kroah-Hartman uport->flags = ((uport->flags & ~UPF_USR_MASK) | 859ab4382d2SGreg Kroah-Hartman (new_flags & UPF_USR_MASK)); 8607ba2e769SAlan Cox uport->custom_divisor = new_info->custom_divisor; 861ab4382d2SGreg Kroah-Hartman goto check_and_exit; 862ab4382d2SGreg Kroah-Hartman } 863ab4382d2SGreg Kroah-Hartman 8645e722b21SOndrej Mosnacek if (change_irq || change_port) { 865794edf30SDavid Howells retval = security_locked_down(LOCKDOWN_TIOCSSERIAL); 8665e722b21SOndrej Mosnacek if (retval) 867794edf30SDavid Howells goto exit; 8685e722b21SOndrej Mosnacek } 869794edf30SDavid Howells 870ab4382d2SGreg Kroah-Hartman /* 871ab4382d2SGreg Kroah-Hartman * Ask the low level driver to verify the settings. 872ab4382d2SGreg Kroah-Hartman */ 873ab4382d2SGreg Kroah-Hartman if (uport->ops->verify_port) 8747ba2e769SAlan Cox retval = uport->ops->verify_port(uport, new_info); 875ab4382d2SGreg Kroah-Hartman 8767ba2e769SAlan Cox if ((new_info->irq >= nr_irqs) || (new_info->irq < 0) || 8777ba2e769SAlan Cox (new_info->baud_base < 9600)) 878ab4382d2SGreg Kroah-Hartman retval = -EINVAL; 879ab4382d2SGreg Kroah-Hartman 880ab4382d2SGreg Kroah-Hartman if (retval) 881ab4382d2SGreg Kroah-Hartman goto exit; 882ab4382d2SGreg Kroah-Hartman 883ab4382d2SGreg Kroah-Hartman if (change_port || change_irq) { 884ab4382d2SGreg Kroah-Hartman retval = -EBUSY; 885ab4382d2SGreg Kroah-Hartman 886ab4382d2SGreg Kroah-Hartman /* 887ab4382d2SGreg Kroah-Hartman * Make sure that we are the sole user of this port. 888ab4382d2SGreg Kroah-Hartman */ 889ab4382d2SGreg Kroah-Hartman if (tty_port_users(port) > 1) 890ab4382d2SGreg Kroah-Hartman goto exit; 891ab4382d2SGreg Kroah-Hartman 892ab4382d2SGreg Kroah-Hartman /* 893ab4382d2SGreg Kroah-Hartman * We need to shutdown the serial port at the old 894ab4382d2SGreg Kroah-Hartman * port/type/irq combination. 895ab4382d2SGreg Kroah-Hartman */ 896ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 897ab4382d2SGreg Kroah-Hartman } 898ab4382d2SGreg Kroah-Hartman 899ab4382d2SGreg Kroah-Hartman if (change_port) { 900ab4382d2SGreg Kroah-Hartman unsigned long old_iobase, old_mapbase; 901ab4382d2SGreg Kroah-Hartman unsigned int old_type, old_iotype, old_hub6, old_shift; 902ab4382d2SGreg Kroah-Hartman 903ab4382d2SGreg Kroah-Hartman old_iobase = uport->iobase; 904ab4382d2SGreg Kroah-Hartman old_mapbase = uport->mapbase; 905ab4382d2SGreg Kroah-Hartman old_type = uport->type; 906ab4382d2SGreg Kroah-Hartman old_hub6 = uport->hub6; 907ab4382d2SGreg Kroah-Hartman old_iotype = uport->iotype; 908ab4382d2SGreg Kroah-Hartman old_shift = uport->regshift; 909ab4382d2SGreg Kroah-Hartman 910ab4382d2SGreg Kroah-Hartman /* 911ab4382d2SGreg Kroah-Hartman * Free and release old regions 912ab4382d2SGreg Kroah-Hartman */ 913a7cfaf16SFabio Estevam if (old_type != PORT_UNKNOWN && uport->ops->release_port) 914ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 915ab4382d2SGreg Kroah-Hartman 916ab4382d2SGreg Kroah-Hartman uport->iobase = new_port; 9177ba2e769SAlan Cox uport->type = new_info->type; 9187ba2e769SAlan Cox uport->hub6 = new_info->hub6; 9197ba2e769SAlan Cox uport->iotype = new_info->io_type; 9207ba2e769SAlan Cox uport->regshift = new_info->iomem_reg_shift; 9217ba2e769SAlan Cox uport->mapbase = (unsigned long)new_info->iomem_base; 922ab4382d2SGreg Kroah-Hartman 923ab4382d2SGreg Kroah-Hartman /* 924ab4382d2SGreg Kroah-Hartman * Claim and map the new regions 925ab4382d2SGreg Kroah-Hartman */ 926a7cfaf16SFabio Estevam if (uport->type != PORT_UNKNOWN && uport->ops->request_port) { 927ab4382d2SGreg Kroah-Hartman retval = uport->ops->request_port(uport); 928ab4382d2SGreg Kroah-Hartman } else { 929ab4382d2SGreg Kroah-Hartman /* Always success - Jean II */ 930ab4382d2SGreg Kroah-Hartman retval = 0; 931ab4382d2SGreg Kroah-Hartman } 932ab4382d2SGreg Kroah-Hartman 933ab4382d2SGreg Kroah-Hartman /* 934ab4382d2SGreg Kroah-Hartman * If we fail to request resources for the 935ab4382d2SGreg Kroah-Hartman * new port, try to restore the old settings. 936ab4382d2SGreg Kroah-Hartman */ 9377deb39edSThomas Pfaff if (retval) { 938ab4382d2SGreg Kroah-Hartman uport->iobase = old_iobase; 939ab4382d2SGreg Kroah-Hartman uport->type = old_type; 940ab4382d2SGreg Kroah-Hartman uport->hub6 = old_hub6; 941ab4382d2SGreg Kroah-Hartman uport->iotype = old_iotype; 942ab4382d2SGreg Kroah-Hartman uport->regshift = old_shift; 943ab4382d2SGreg Kroah-Hartman uport->mapbase = old_mapbase; 9447deb39edSThomas Pfaff 9457deb39edSThomas Pfaff if (old_type != PORT_UNKNOWN) { 946ab4382d2SGreg Kroah-Hartman retval = uport->ops->request_port(uport); 947ab4382d2SGreg Kroah-Hartman /* 948ab4382d2SGreg Kroah-Hartman * If we failed to restore the old settings, 949ab4382d2SGreg Kroah-Hartman * we fail like this. 950ab4382d2SGreg Kroah-Hartman */ 951ab4382d2SGreg Kroah-Hartman if (retval) 952ab4382d2SGreg Kroah-Hartman uport->type = PORT_UNKNOWN; 953ab4382d2SGreg Kroah-Hartman 954ab4382d2SGreg Kroah-Hartman /* 955ab4382d2SGreg Kroah-Hartman * We failed anyway. 956ab4382d2SGreg Kroah-Hartman */ 957ab4382d2SGreg Kroah-Hartman retval = -EBUSY; 9587deb39edSThomas Pfaff } 9597deb39edSThomas Pfaff 960ab4382d2SGreg Kroah-Hartman /* Added to return the correct error -Ram Gupta */ 961ab4382d2SGreg Kroah-Hartman goto exit; 962ab4382d2SGreg Kroah-Hartman } 963ab4382d2SGreg Kroah-Hartman } 964ab4382d2SGreg Kroah-Hartman 965ab4382d2SGreg Kroah-Hartman if (change_irq) 9667ba2e769SAlan Cox uport->irq = new_info->irq; 967ab4382d2SGreg Kroah-Hartman if (!(uport->flags & UPF_FIXED_PORT)) 9687ba2e769SAlan Cox uport->uartclk = new_info->baud_base * 16; 969ab4382d2SGreg Kroah-Hartman uport->flags = (uport->flags & ~UPF_CHANGE_MASK) | 970ab4382d2SGreg Kroah-Hartman (new_flags & UPF_CHANGE_MASK); 9717ba2e769SAlan Cox uport->custom_divisor = new_info->custom_divisor; 972ab4382d2SGreg Kroah-Hartman port->close_delay = close_delay; 973ab4382d2SGreg Kroah-Hartman port->closing_wait = closing_wait; 9747ba2e769SAlan Cox if (new_info->xmit_fifo_size) 9757ba2e769SAlan Cox uport->fifosize = new_info->xmit_fifo_size; 976ab4382d2SGreg Kroah-Hartman 977ab4382d2SGreg Kroah-Hartman check_and_exit: 978ab4382d2SGreg Kroah-Hartman retval = 0; 979ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) 980ab4382d2SGreg Kroah-Hartman goto exit; 981d41861caSPeter Hurley if (tty_port_initialized(port)) { 982ab4382d2SGreg Kroah-Hartman if (((old_flags ^ uport->flags) & UPF_SPD_MASK) || 983ab4382d2SGreg Kroah-Hartman old_custom_divisor != uport->custom_divisor) { 984ab4382d2SGreg Kroah-Hartman /* 985ab4382d2SGreg Kroah-Hartman * If they're setting up a custom divisor or speed, 986dc2f7271SJohan Hovold * instead of clearing it, then bitch about it. 987ab4382d2SGreg Kroah-Hartman */ 988ab4382d2SGreg Kroah-Hartman if (uport->flags & UPF_SPD_MASK) { 989dc2f7271SJohan Hovold dev_notice_ratelimited(uport->dev, 9902f2dafe7SSudip Mukherjee "%s sets custom speed on %s. This is deprecated.\n", 9912f2dafe7SSudip Mukherjee current->comm, 992429b4749SRasmus Villemoes tty_name(port->tty)); 993ab4382d2SGreg Kroah-Hartman } 994826736a6SIlpo Järvinen uart_change_line_settings(tty, state, NULL); 995ab4382d2SGreg Kroah-Hartman } 996b3b57646SRob Herring } else { 997dcd794c6SIlpo Järvinen retval = uart_startup(tty, state, true); 99844117a1dSSebastian Andrzej Siewior if (retval == 0) 99944117a1dSSebastian Andrzej Siewior tty_port_set_initialized(port, true); 1000b3b57646SRob Herring if (retval > 0) 1001b3b57646SRob Herring retval = 0; 1002b3b57646SRob Herring } 1003ab4382d2SGreg Kroah-Hartman exit: 10047ba2e769SAlan Cox return retval; 10057ba2e769SAlan Cox } 10067ba2e769SAlan Cox 10075099d234SAl Viro static int uart_set_info_user(struct tty_struct *tty, struct serial_struct *ss) 10087ba2e769SAlan Cox { 10095099d234SAl Viro struct uart_state *state = tty->driver_data; 10107ba2e769SAlan Cox struct tty_port *port = &state->port; 10117ba2e769SAlan Cox int retval; 10127ba2e769SAlan Cox 10135099d234SAl Viro down_write(&tty->termios_rwsem); 10147ba2e769SAlan Cox /* 10157ba2e769SAlan Cox * This semaphore protects port->count. It is also 10167ba2e769SAlan Cox * very useful to prevent opens. Also, take the 10177ba2e769SAlan Cox * port configuration semaphore to make sure that a 10187ba2e769SAlan Cox * module insertion/removal doesn't change anything 10197ba2e769SAlan Cox * under us. 10207ba2e769SAlan Cox */ 10217ba2e769SAlan Cox mutex_lock(&port->mutex); 10225099d234SAl Viro retval = uart_set_info(tty, port, state, ss); 1023ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 10245099d234SAl Viro up_write(&tty->termios_rwsem); 1025ab4382d2SGreg Kroah-Hartman return retval; 1026ab4382d2SGreg Kroah-Hartman } 1027ab4382d2SGreg Kroah-Hartman 1028ab4382d2SGreg Kroah-Hartman /** 1029ab4382d2SGreg Kroah-Hartman * uart_get_lsr_info - get line status register info 1030ab4382d2SGreg Kroah-Hartman * @tty: tty associated with the UART 1031ab4382d2SGreg Kroah-Hartman * @state: UART being queried 1032ab4382d2SGreg Kroah-Hartman * @value: returned modem value 1033ab4382d2SGreg Kroah-Hartman */ 1034ab4382d2SGreg Kroah-Hartman static int uart_get_lsr_info(struct tty_struct *tty, 1035ab4382d2SGreg Kroah-Hartman struct uart_state *state, unsigned int __user *value) 1036ab4382d2SGreg Kroah-Hartman { 10374047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 1038ab4382d2SGreg Kroah-Hartman unsigned int result; 1039ab4382d2SGreg Kroah-Hartman 1040ab4382d2SGreg Kroah-Hartman result = uport->ops->tx_empty(uport); 1041ab4382d2SGreg Kroah-Hartman 1042ab4382d2SGreg Kroah-Hartman /* 1043ab4382d2SGreg Kroah-Hartman * If we're about to load something into the transmit 1044ab4382d2SGreg Kroah-Hartman * register, we'll pretend the transmitter isn't empty to 1045ab4382d2SGreg Kroah-Hartman * avoid a race condition (depending on when the transmit 1046ab4382d2SGreg Kroah-Hartman * interrupt happens). 1047ab4382d2SGreg Kroah-Hartman */ 1048ab4382d2SGreg Kroah-Hartman if (uport->x_char || 1049ab4382d2SGreg Kroah-Hartman ((uart_circ_chars_pending(&state->xmit) > 0) && 1050d01f4d18SPeter Hurley !uart_tx_stopped(uport))) 1051ab4382d2SGreg Kroah-Hartman result &= ~TIOCSER_TEMT; 1052ab4382d2SGreg Kroah-Hartman 1053ab4382d2SGreg Kroah-Hartman return put_user(result, value); 1054ab4382d2SGreg Kroah-Hartman } 1055ab4382d2SGreg Kroah-Hartman 105660b33c13SAlan Cox static int uart_tiocmget(struct tty_struct *tty) 1057ab4382d2SGreg Kroah-Hartman { 1058ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1059ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 10604047b371SPeter Hurley struct uart_port *uport; 1061ab4382d2SGreg Kroah-Hartman int result = -EIO; 1062ab4382d2SGreg Kroah-Hartman 1063ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 10644047b371SPeter Hurley uport = uart_port_check(state); 10654047b371SPeter Hurley if (!uport) 10664047b371SPeter Hurley goto out; 10674047b371SPeter Hurley 106818900ca6SPeter Hurley if (!tty_io_error(tty)) { 1069ab4382d2SGreg Kroah-Hartman result = uport->mctrl; 1070ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1071ab4382d2SGreg Kroah-Hartman result |= uport->ops->get_mctrl(uport); 1072ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1073ab4382d2SGreg Kroah-Hartman } 10744047b371SPeter Hurley out: 1075ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1076ab4382d2SGreg Kroah-Hartman return result; 1077ab4382d2SGreg Kroah-Hartman } 1078ab4382d2SGreg Kroah-Hartman 1079ab4382d2SGreg Kroah-Hartman static int 108020b9d177SAlan Cox uart_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear) 1081ab4382d2SGreg Kroah-Hartman { 1082ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1083ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 10844047b371SPeter Hurley struct uart_port *uport; 1085ab4382d2SGreg Kroah-Hartman int ret = -EIO; 1086ab4382d2SGreg Kroah-Hartman 1087ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 10884047b371SPeter Hurley uport = uart_port_check(state); 10894047b371SPeter Hurley if (!uport) 10904047b371SPeter Hurley goto out; 10914047b371SPeter Hurley 109218900ca6SPeter Hurley if (!tty_io_error(tty)) { 1093ab4382d2SGreg Kroah-Hartman uart_update_mctrl(uport, set, clear); 1094ab4382d2SGreg Kroah-Hartman ret = 0; 1095ab4382d2SGreg Kroah-Hartman } 10964047b371SPeter Hurley out: 1097ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1098ab4382d2SGreg Kroah-Hartman return ret; 1099ab4382d2SGreg Kroah-Hartman } 1100ab4382d2SGreg Kroah-Hartman 1101ab4382d2SGreg Kroah-Hartman static int uart_break_ctl(struct tty_struct *tty, int break_state) 1102ab4382d2SGreg Kroah-Hartman { 1103ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1104ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 11054047b371SPeter Hurley struct uart_port *uport; 11064047b371SPeter Hurley int ret = -EIO; 1107ab4382d2SGreg Kroah-Hartman 1108ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 11094047b371SPeter Hurley uport = uart_port_check(state); 11104047b371SPeter Hurley if (!uport) 11114047b371SPeter Hurley goto out; 1112ab4382d2SGreg Kroah-Hartman 11137d73170eSJiangfeng Xiao if (uport->type != PORT_UNKNOWN && uport->ops->break_ctl) 1114ab4382d2SGreg Kroah-Hartman uport->ops->break_ctl(uport, break_state); 11154047b371SPeter Hurley ret = 0; 11164047b371SPeter Hurley out: 1117ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 11184047b371SPeter Hurley return ret; 1119ab4382d2SGreg Kroah-Hartman } 1120ab4382d2SGreg Kroah-Hartman 1121ab4382d2SGreg Kroah-Hartman static int uart_do_autoconfig(struct tty_struct *tty, struct uart_state *state) 1122ab4382d2SGreg Kroah-Hartman { 1123ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 11244047b371SPeter Hurley struct uart_port *uport; 1125ab4382d2SGreg Kroah-Hartman int flags, ret; 1126ab4382d2SGreg Kroah-Hartman 1127ab4382d2SGreg Kroah-Hartman if (!capable(CAP_SYS_ADMIN)) 1128ab4382d2SGreg Kroah-Hartman return -EPERM; 1129ab4382d2SGreg Kroah-Hartman 1130ab4382d2SGreg Kroah-Hartman /* 1131ab4382d2SGreg Kroah-Hartman * Take the per-port semaphore. This prevents count from 1132ab4382d2SGreg Kroah-Hartman * changing, and hence any extra opens of the port while 1133ab4382d2SGreg Kroah-Hartman * we're auto-configuring. 1134ab4382d2SGreg Kroah-Hartman */ 1135ab4382d2SGreg Kroah-Hartman if (mutex_lock_interruptible(&port->mutex)) 1136ab4382d2SGreg Kroah-Hartman return -ERESTARTSYS; 1137ab4382d2SGreg Kroah-Hartman 11384047b371SPeter Hurley uport = uart_port_check(state); 11394047b371SPeter Hurley if (!uport) { 11404047b371SPeter Hurley ret = -EIO; 11414047b371SPeter Hurley goto out; 11424047b371SPeter Hurley } 11434047b371SPeter Hurley 1144ab4382d2SGreg Kroah-Hartman ret = -EBUSY; 1145ab4382d2SGreg Kroah-Hartman if (tty_port_users(port) == 1) { 1146ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 1147ab4382d2SGreg Kroah-Hartman 1148ab4382d2SGreg Kroah-Hartman /* 1149ab4382d2SGreg Kroah-Hartman * If we already have a port type configured, 1150ab4382d2SGreg Kroah-Hartman * we must release its resources. 1151ab4382d2SGreg Kroah-Hartman */ 1152a7cfaf16SFabio Estevam if (uport->type != PORT_UNKNOWN && uport->ops->release_port) 1153ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 1154ab4382d2SGreg Kroah-Hartman 1155ab4382d2SGreg Kroah-Hartman flags = UART_CONFIG_TYPE; 1156ab4382d2SGreg Kroah-Hartman if (uport->flags & UPF_AUTO_IRQ) 1157ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_IRQ; 1158ab4382d2SGreg Kroah-Hartman 1159ab4382d2SGreg Kroah-Hartman /* 1160ab4382d2SGreg Kroah-Hartman * This will claim the ports resources if 1161ab4382d2SGreg Kroah-Hartman * a port is found. 1162ab4382d2SGreg Kroah-Hartman */ 1163ab4382d2SGreg Kroah-Hartman uport->ops->config_port(uport, flags); 1164ab4382d2SGreg Kroah-Hartman 1165dcd794c6SIlpo Järvinen ret = uart_startup(tty, state, true); 116671456906SSebastian Andrzej Siewior if (ret == 0) 116771456906SSebastian Andrzej Siewior tty_port_set_initialized(port, true); 1168b3b57646SRob Herring if (ret > 0) 1169b3b57646SRob Herring ret = 0; 1170ab4382d2SGreg Kroah-Hartman } 11714047b371SPeter Hurley out: 1172ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1173ab4382d2SGreg Kroah-Hartman return ret; 1174ab4382d2SGreg Kroah-Hartman } 1175ab4382d2SGreg Kroah-Hartman 11761fdc3106SAlexander Shiyan static void uart_enable_ms(struct uart_port *uport) 11771fdc3106SAlexander Shiyan { 11781fdc3106SAlexander Shiyan /* 11791fdc3106SAlexander Shiyan * Force modem status interrupts on 11801fdc3106SAlexander Shiyan */ 11811fdc3106SAlexander Shiyan if (uport->ops->enable_ms) 11821fdc3106SAlexander Shiyan uport->ops->enable_ms(uport); 11831fdc3106SAlexander Shiyan } 11841fdc3106SAlexander Shiyan 1185ab4382d2SGreg Kroah-Hartman /* 1186ab4382d2SGreg Kroah-Hartman * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change 1187ab4382d2SGreg Kroah-Hartman * - mask passed in arg for lines of interest 1188ab4382d2SGreg Kroah-Hartman * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) 1189ab4382d2SGreg Kroah-Hartman * Caller should use TIOCGICOUNT to see which one it was 1190ab4382d2SGreg Kroah-Hartman * 1191ab4382d2SGreg Kroah-Hartman * FIXME: This wants extracting into a common all driver implementation 1192ab4382d2SGreg Kroah-Hartman * of TIOCMWAIT using tty_port. 1193ab4382d2SGreg Kroah-Hartman */ 11949ed19428SPeter Hurley static int uart_wait_modem_status(struct uart_state *state, unsigned long arg) 1195ab4382d2SGreg Kroah-Hartman { 11969ed19428SPeter Hurley struct uart_port *uport; 1197ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1198ab4382d2SGreg Kroah-Hartman DECLARE_WAITQUEUE(wait, current); 1199ab4382d2SGreg Kroah-Hartman struct uart_icount cprev, cnow; 1200ab4382d2SGreg Kroah-Hartman int ret; 1201ab4382d2SGreg Kroah-Hartman 1202ab4382d2SGreg Kroah-Hartman /* 1203ab4382d2SGreg Kroah-Hartman * note the counters on entry 1204ab4382d2SGreg Kroah-Hartman */ 12059ed19428SPeter Hurley uport = uart_port_ref(state); 12069ed19428SPeter Hurley if (!uport) 12079ed19428SPeter Hurley return -EIO; 1208ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1209ab4382d2SGreg Kroah-Hartman memcpy(&cprev, &uport->icount, sizeof(struct uart_icount)); 12101fdc3106SAlexander Shiyan uart_enable_ms(uport); 1211ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1212ab4382d2SGreg Kroah-Hartman 1213ab4382d2SGreg Kroah-Hartman add_wait_queue(&port->delta_msr_wait, &wait); 1214ab4382d2SGreg Kroah-Hartman for (;;) { 1215ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1216ab4382d2SGreg Kroah-Hartman memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); 1217ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1218ab4382d2SGreg Kroah-Hartman 1219ab4382d2SGreg Kroah-Hartman set_current_state(TASK_INTERRUPTIBLE); 1220ab4382d2SGreg Kroah-Hartman 1221ab4382d2SGreg Kroah-Hartman if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || 1222ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || 1223ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || 1224ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) { 1225ab4382d2SGreg Kroah-Hartman ret = 0; 1226ab4382d2SGreg Kroah-Hartman break; 1227ab4382d2SGreg Kroah-Hartman } 1228ab4382d2SGreg Kroah-Hartman 1229ab4382d2SGreg Kroah-Hartman schedule(); 1230ab4382d2SGreg Kroah-Hartman 1231ab4382d2SGreg Kroah-Hartman /* see if a signal did it */ 1232ab4382d2SGreg Kroah-Hartman if (signal_pending(current)) { 1233ab4382d2SGreg Kroah-Hartman ret = -ERESTARTSYS; 1234ab4382d2SGreg Kroah-Hartman break; 1235ab4382d2SGreg Kroah-Hartman } 1236ab4382d2SGreg Kroah-Hartman 1237ab4382d2SGreg Kroah-Hartman cprev = cnow; 1238ab4382d2SGreg Kroah-Hartman } 123997f9f707SFabian Frederick __set_current_state(TASK_RUNNING); 1240ab4382d2SGreg Kroah-Hartman remove_wait_queue(&port->delta_msr_wait, &wait); 12419ed19428SPeter Hurley uart_port_deref(uport); 1242ab4382d2SGreg Kroah-Hartman 1243ab4382d2SGreg Kroah-Hartman return ret; 1244ab4382d2SGreg Kroah-Hartman } 1245ab4382d2SGreg Kroah-Hartman 1246ab4382d2SGreg Kroah-Hartman /* 1247ab4382d2SGreg Kroah-Hartman * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) 1248ab4382d2SGreg Kroah-Hartman * Return: write counters to the user passed counter struct 1249ab4382d2SGreg Kroah-Hartman * NB: both 1->0 and 0->1 transitions are counted except for 1250ab4382d2SGreg Kroah-Hartman * RI where only 0->1 is counted. 1251ab4382d2SGreg Kroah-Hartman */ 1252ab4382d2SGreg Kroah-Hartman static int uart_get_icount(struct tty_struct *tty, 1253ab4382d2SGreg Kroah-Hartman struct serial_icounter_struct *icount) 1254ab4382d2SGreg Kroah-Hartman { 1255ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1256ab4382d2SGreg Kroah-Hartman struct uart_icount cnow; 12579ed19428SPeter Hurley struct uart_port *uport; 1258ab4382d2SGreg Kroah-Hartman 12599ed19428SPeter Hurley uport = uart_port_ref(state); 12609ed19428SPeter Hurley if (!uport) 12619ed19428SPeter Hurley return -EIO; 1262ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1263ab4382d2SGreg Kroah-Hartman memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); 1264ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 12659ed19428SPeter Hurley uart_port_deref(uport); 1266ab4382d2SGreg Kroah-Hartman 1267ab4382d2SGreg Kroah-Hartman icount->cts = cnow.cts; 1268ab4382d2SGreg Kroah-Hartman icount->dsr = cnow.dsr; 1269ab4382d2SGreg Kroah-Hartman icount->rng = cnow.rng; 1270ab4382d2SGreg Kroah-Hartman icount->dcd = cnow.dcd; 1271ab4382d2SGreg Kroah-Hartman icount->rx = cnow.rx; 1272ab4382d2SGreg Kroah-Hartman icount->tx = cnow.tx; 1273ab4382d2SGreg Kroah-Hartman icount->frame = cnow.frame; 1274ab4382d2SGreg Kroah-Hartman icount->overrun = cnow.overrun; 1275ab4382d2SGreg Kroah-Hartman icount->parity = cnow.parity; 1276ab4382d2SGreg Kroah-Hartman icount->brk = cnow.brk; 1277ab4382d2SGreg Kroah-Hartman icount->buf_overrun = cnow.buf_overrun; 1278ab4382d2SGreg Kroah-Hartman 1279ab4382d2SGreg Kroah-Hartman return 0; 1280ab4382d2SGreg Kroah-Hartman } 1281ab4382d2SGreg Kroah-Hartman 128251ad36baSIlpo Järvinen #define SER_RS485_LEGACY_FLAGS (SER_RS485_ENABLED | SER_RS485_RTS_ON_SEND | \ 128351ad36baSIlpo Järvinen SER_RS485_RTS_AFTER_SEND | SER_RS485_RX_DURING_TX | \ 128451ad36baSIlpo Järvinen SER_RS485_TERMINATE_BUS) 128551ad36baSIlpo Järvinen 128651ad36baSIlpo Järvinen static int uart_check_rs485_flags(struct uart_port *port, struct serial_rs485 *rs485) 128751ad36baSIlpo Järvinen { 128851ad36baSIlpo Järvinen u32 flags = rs485->flags; 128951ad36baSIlpo Järvinen 129051ad36baSIlpo Järvinen /* Don't return -EINVAL for unsupported legacy flags */ 129151ad36baSIlpo Järvinen flags &= ~SER_RS485_LEGACY_FLAGS; 129251ad36baSIlpo Järvinen 129351ad36baSIlpo Järvinen /* 129451ad36baSIlpo Järvinen * For any bit outside of the legacy ones that is not supported by 129551ad36baSIlpo Järvinen * the driver, return -EINVAL. 129651ad36baSIlpo Järvinen */ 12970139da50SIlpo Järvinen if (flags & ~port->rs485_supported.flags) 129851ad36baSIlpo Järvinen return -EINVAL; 129951ad36baSIlpo Järvinen 13004f768e94SIlpo Järvinen /* Asking for address w/o addressing mode? */ 13014f768e94SIlpo Järvinen if (!(rs485->flags & SER_RS485_ADDRB) && 13024f768e94SIlpo Järvinen (rs485->flags & (SER_RS485_ADDR_RECV|SER_RS485_ADDR_DEST))) 13034f768e94SIlpo Järvinen return -EINVAL; 13044f768e94SIlpo Järvinen 13054f768e94SIlpo Järvinen /* Address given but not enabled? */ 13064f768e94SIlpo Järvinen if (!(rs485->flags & SER_RS485_ADDR_RECV) && rs485->addr_recv) 13074f768e94SIlpo Järvinen return -EINVAL; 13084f768e94SIlpo Järvinen if (!(rs485->flags & SER_RS485_ADDR_DEST) && rs485->addr_dest) 13094f768e94SIlpo Järvinen return -EINVAL; 13104f768e94SIlpo Järvinen 131151ad36baSIlpo Järvinen return 0; 131251ad36baSIlpo Järvinen } 131351ad36baSIlpo Järvinen 1314d8fcd9cfSLino Sanfilippo static void uart_sanitize_serial_rs485_delays(struct uart_port *port, 1315d8fcd9cfSLino Sanfilippo struct serial_rs485 *rs485) 13162dbd0c14SIlpo Järvinen { 13170139da50SIlpo Järvinen if (!port->rs485_supported.delay_rts_before_send) { 1318be2e2cb1SIlpo Järvinen if (rs485->delay_rts_before_send) { 1319be2e2cb1SIlpo Järvinen dev_warn_ratelimited(port->dev, 1320be2e2cb1SIlpo Järvinen "%s (%d): RTS delay before sending not supported\n", 1321be2e2cb1SIlpo Järvinen port->name, port->line); 1322be2e2cb1SIlpo Järvinen } 1323be2e2cb1SIlpo Järvinen rs485->delay_rts_before_send = 0; 1324be2e2cb1SIlpo Järvinen } else if (rs485->delay_rts_before_send > RS485_MAX_RTS_DELAY) { 13252dbd0c14SIlpo Järvinen rs485->delay_rts_before_send = RS485_MAX_RTS_DELAY; 13262dbd0c14SIlpo Järvinen dev_warn_ratelimited(port->dev, 13272dbd0c14SIlpo Järvinen "%s (%d): RTS delay before sending clamped to %u ms\n", 13282dbd0c14SIlpo Järvinen port->name, port->line, rs485->delay_rts_before_send); 13292dbd0c14SIlpo Järvinen } 13302dbd0c14SIlpo Järvinen 13310139da50SIlpo Järvinen if (!port->rs485_supported.delay_rts_after_send) { 1332be2e2cb1SIlpo Järvinen if (rs485->delay_rts_after_send) { 1333be2e2cb1SIlpo Järvinen dev_warn_ratelimited(port->dev, 1334be2e2cb1SIlpo Järvinen "%s (%d): RTS delay after sending not supported\n", 1335be2e2cb1SIlpo Järvinen port->name, port->line); 1336be2e2cb1SIlpo Järvinen } 1337be2e2cb1SIlpo Järvinen rs485->delay_rts_after_send = 0; 1338be2e2cb1SIlpo Järvinen } else if (rs485->delay_rts_after_send > RS485_MAX_RTS_DELAY) { 13392dbd0c14SIlpo Järvinen rs485->delay_rts_after_send = RS485_MAX_RTS_DELAY; 13402dbd0c14SIlpo Järvinen dev_warn_ratelimited(port->dev, 13412dbd0c14SIlpo Järvinen "%s (%d): RTS delay after sending clamped to %u ms\n", 13422dbd0c14SIlpo Järvinen port->name, port->line, rs485->delay_rts_after_send); 13432dbd0c14SIlpo Järvinen } 1344d8fcd9cfSLino Sanfilippo } 1345d8fcd9cfSLino Sanfilippo 1346d8fcd9cfSLino Sanfilippo static void uart_sanitize_serial_rs485(struct uart_port *port, struct serial_rs485 *rs485) 1347d8fcd9cfSLino Sanfilippo { 1348d8fcd9cfSLino Sanfilippo u32 supported_flags = port->rs485_supported.flags; 1349d8fcd9cfSLino Sanfilippo 1350d8fcd9cfSLino Sanfilippo if (!(rs485->flags & SER_RS485_ENABLED)) { 1351d8fcd9cfSLino Sanfilippo memset(rs485, 0, sizeof(*rs485)); 1352d8fcd9cfSLino Sanfilippo return; 1353d8fcd9cfSLino Sanfilippo } 1354d8fcd9cfSLino Sanfilippo 1355d8fcd9cfSLino Sanfilippo /* Pick sane settings if the user hasn't */ 1356d8fcd9cfSLino Sanfilippo if ((supported_flags & (SER_RS485_RTS_ON_SEND|SER_RS485_RTS_AFTER_SEND)) && 1357d8fcd9cfSLino Sanfilippo !(rs485->flags & SER_RS485_RTS_ON_SEND) == 1358d8fcd9cfSLino Sanfilippo !(rs485->flags & SER_RS485_RTS_AFTER_SEND)) { 1359d8fcd9cfSLino Sanfilippo dev_warn_ratelimited(port->dev, 1360d8fcd9cfSLino Sanfilippo "%s (%d): invalid RTS setting, using RTS_ON_SEND instead\n", 1361d8fcd9cfSLino Sanfilippo port->name, port->line); 1362d8fcd9cfSLino Sanfilippo rs485->flags |= SER_RS485_RTS_ON_SEND; 1363d8fcd9cfSLino Sanfilippo rs485->flags &= ~SER_RS485_RTS_AFTER_SEND; 1364d8fcd9cfSLino Sanfilippo supported_flags |= SER_RS485_RTS_ON_SEND|SER_RS485_RTS_AFTER_SEND; 1365d8fcd9cfSLino Sanfilippo } 1366be2e2cb1SIlpo Järvinen 1367be2e2cb1SIlpo Järvinen rs485->flags &= supported_flags; 1368be2e2cb1SIlpo Järvinen 1369d8fcd9cfSLino Sanfilippo uart_sanitize_serial_rs485_delays(port, rs485); 1370d8fcd9cfSLino Sanfilippo 13712dbd0c14SIlpo Järvinen /* Return clean padding area to userspace */ 13724f768e94SIlpo Järvinen memset(rs485->padding0, 0, sizeof(rs485->padding0)); 13734f768e94SIlpo Järvinen memset(rs485->padding1, 0, sizeof(rs485->padding1)); 13742dbd0c14SIlpo Järvinen } 13752dbd0c14SIlpo Järvinen 137644b27aecSLino Sanfilippo static void uart_set_rs485_termination(struct uart_port *port, 137744b27aecSLino Sanfilippo const struct serial_rs485 *rs485) 137844b27aecSLino Sanfilippo { 137944b27aecSLino Sanfilippo if (!(rs485->flags & SER_RS485_ENABLED)) 138044b27aecSLino Sanfilippo return; 138144b27aecSLino Sanfilippo 138244b27aecSLino Sanfilippo gpiod_set_value_cansleep(port->rs485_term_gpio, 138344b27aecSLino Sanfilippo !!(rs485->flags & SER_RS485_TERMINATE_BUS)); 138444b27aecSLino Sanfilippo } 138544b27aecSLino Sanfilippo 13867c7f9bc9SLukas Wunner static int uart_rs485_config(struct uart_port *port) 13878322b1f5SIlpo Järvinen { 1388be2e2cb1SIlpo Järvinen struct serial_rs485 *rs485 = &port->rs485; 1389596a9171SIlpo Järvinen int ret; 1390be2e2cb1SIlpo Järvinen 1391be2e2cb1SIlpo Järvinen uart_sanitize_serial_rs485(port, rs485); 139244b27aecSLino Sanfilippo uart_set_rs485_termination(port, rs485); 1393be2e2cb1SIlpo Järvinen 1394ae50bb27SIlpo Järvinen ret = port->rs485_config(port, NULL, rs485); 1395596a9171SIlpo Järvinen if (ret) 1396596a9171SIlpo Järvinen memset(rs485, 0, sizeof(*rs485)); 1397596a9171SIlpo Järvinen 1398596a9171SIlpo Järvinen return ret; 13998322b1f5SIlpo Järvinen } 14008322b1f5SIlpo Järvinen 1401a5f276f1SRicardo Ribalda Delgado static int uart_get_rs485_config(struct uart_port *port, 1402a5f276f1SRicardo Ribalda Delgado struct serial_rs485 __user *rs485) 1403a5f276f1SRicardo Ribalda Delgado { 1404bd737f87SRicardo Ribalda Delgado unsigned long flags; 1405bd737f87SRicardo Ribalda Delgado struct serial_rs485 aux; 1406bd737f87SRicardo Ribalda Delgado 1407bd737f87SRicardo Ribalda Delgado spin_lock_irqsave(&port->lock, flags); 1408bd737f87SRicardo Ribalda Delgado aux = port->rs485; 1409bd737f87SRicardo Ribalda Delgado spin_unlock_irqrestore(&port->lock, flags); 1410bd737f87SRicardo Ribalda Delgado 1411bd737f87SRicardo Ribalda Delgado if (copy_to_user(rs485, &aux, sizeof(aux))) 1412a5f276f1SRicardo Ribalda Delgado return -EFAULT; 1413bd737f87SRicardo Ribalda Delgado 1414a5f276f1SRicardo Ribalda Delgado return 0; 1415a5f276f1SRicardo Ribalda Delgado } 1416a5f276f1SRicardo Ribalda Delgado 1417ae50bb27SIlpo Järvinen static int uart_set_rs485_config(struct tty_struct *tty, struct uart_port *port, 1418a5f276f1SRicardo Ribalda Delgado struct serial_rs485 __user *rs485_user) 1419a5f276f1SRicardo Ribalda Delgado { 1420a5f276f1SRicardo Ribalda Delgado struct serial_rs485 rs485; 1421a5f276f1SRicardo Ribalda Delgado int ret; 1422bd737f87SRicardo Ribalda Delgado unsigned long flags; 1423a5f276f1SRicardo Ribalda Delgado 1424a5f276f1SRicardo Ribalda Delgado if (!port->rs485_config) 142579c5966cSJohan Hovold return -ENOTTY; 1426a5f276f1SRicardo Ribalda Delgado 1427a5f276f1SRicardo Ribalda Delgado if (copy_from_user(&rs485, rs485_user, sizeof(*rs485_user))) 1428a5f276f1SRicardo Ribalda Delgado return -EFAULT; 1429a5f276f1SRicardo Ribalda Delgado 143051ad36baSIlpo Järvinen ret = uart_check_rs485_flags(port, &rs485); 143151ad36baSIlpo Järvinen if (ret) 143251ad36baSIlpo Järvinen return ret; 14332dbd0c14SIlpo Järvinen uart_sanitize_serial_rs485(port, &rs485); 143444b27aecSLino Sanfilippo uart_set_rs485_termination(port, &rs485); 14350ed12afaSLino Sanfilippo 1436bd737f87SRicardo Ribalda Delgado spin_lock_irqsave(&port->lock, flags); 1437ae50bb27SIlpo Järvinen ret = port->rs485_config(port, &tty->termios, &rs485); 14387c7f9bc9SLukas Wunner if (!ret) { 14390ed12afaSLino Sanfilippo port->rs485 = rs485; 14407c7f9bc9SLukas Wunner 14417c7f9bc9SLukas Wunner /* Reset RTS and other mctrl lines when disabling RS485 */ 14427c7f9bc9SLukas Wunner if (!(rs485.flags & SER_RS485_ENABLED)) 14437c7f9bc9SLukas Wunner port->ops->set_mctrl(port, port->mctrl); 14447c7f9bc9SLukas Wunner } 1445bd737f87SRicardo Ribalda Delgado spin_unlock_irqrestore(&port->lock, flags); 1446a5f276f1SRicardo Ribalda Delgado if (ret) 1447a5f276f1SRicardo Ribalda Delgado return ret; 1448a5f276f1SRicardo Ribalda Delgado 1449a5f276f1SRicardo Ribalda Delgado if (copy_to_user(rs485_user, &port->rs485, sizeof(port->rs485))) 1450a5f276f1SRicardo Ribalda Delgado return -EFAULT; 1451a5f276f1SRicardo Ribalda Delgado 1452a5f276f1SRicardo Ribalda Delgado return 0; 1453a5f276f1SRicardo Ribalda Delgado } 1454a5f276f1SRicardo Ribalda Delgado 1455ad8c0eaaSNicolas Ferre static int uart_get_iso7816_config(struct uart_port *port, 1456ad8c0eaaSNicolas Ferre struct serial_iso7816 __user *iso7816) 1457ad8c0eaaSNicolas Ferre { 1458ad8c0eaaSNicolas Ferre unsigned long flags; 1459ad8c0eaaSNicolas Ferre struct serial_iso7816 aux; 1460ad8c0eaaSNicolas Ferre 1461ad8c0eaaSNicolas Ferre if (!port->iso7816_config) 146279c5966cSJohan Hovold return -ENOTTY; 1463ad8c0eaaSNicolas Ferre 1464ad8c0eaaSNicolas Ferre spin_lock_irqsave(&port->lock, flags); 1465ad8c0eaaSNicolas Ferre aux = port->iso7816; 1466ad8c0eaaSNicolas Ferre spin_unlock_irqrestore(&port->lock, flags); 1467ad8c0eaaSNicolas Ferre 1468ad8c0eaaSNicolas Ferre if (copy_to_user(iso7816, &aux, sizeof(aux))) 1469ad8c0eaaSNicolas Ferre return -EFAULT; 1470ad8c0eaaSNicolas Ferre 1471ad8c0eaaSNicolas Ferre return 0; 1472ad8c0eaaSNicolas Ferre } 1473ad8c0eaaSNicolas Ferre 1474ad8c0eaaSNicolas Ferre static int uart_set_iso7816_config(struct uart_port *port, 1475ad8c0eaaSNicolas Ferre struct serial_iso7816 __user *iso7816_user) 1476ad8c0eaaSNicolas Ferre { 1477ad8c0eaaSNicolas Ferre struct serial_iso7816 iso7816; 1478ad8c0eaaSNicolas Ferre int i, ret; 1479ad8c0eaaSNicolas Ferre unsigned long flags; 1480ad8c0eaaSNicolas Ferre 1481ad8c0eaaSNicolas Ferre if (!port->iso7816_config) 148279c5966cSJohan Hovold return -ENOTTY; 1483ad8c0eaaSNicolas Ferre 1484ad8c0eaaSNicolas Ferre if (copy_from_user(&iso7816, iso7816_user, sizeof(*iso7816_user))) 1485ad8c0eaaSNicolas Ferre return -EFAULT; 1486ad8c0eaaSNicolas Ferre 1487ad8c0eaaSNicolas Ferre /* 1488ad8c0eaaSNicolas Ferre * There are 5 words reserved for future use. Check that userspace 1489ad8c0eaaSNicolas Ferre * doesn't put stuff in there to prevent breakages in the future. 1490ad8c0eaaSNicolas Ferre */ 1491eff37b5eSIlpo Järvinen for (i = 0; i < ARRAY_SIZE(iso7816.reserved); i++) 1492ad8c0eaaSNicolas Ferre if (iso7816.reserved[i]) 1493ad8c0eaaSNicolas Ferre return -EINVAL; 1494ad8c0eaaSNicolas Ferre 1495ad8c0eaaSNicolas Ferre spin_lock_irqsave(&port->lock, flags); 1496ad8c0eaaSNicolas Ferre ret = port->iso7816_config(port, &iso7816); 1497ad8c0eaaSNicolas Ferre spin_unlock_irqrestore(&port->lock, flags); 1498ad8c0eaaSNicolas Ferre if (ret) 1499ad8c0eaaSNicolas Ferre return ret; 1500ad8c0eaaSNicolas Ferre 1501ad8c0eaaSNicolas Ferre if (copy_to_user(iso7816_user, &port->iso7816, sizeof(port->iso7816))) 1502ad8c0eaaSNicolas Ferre return -EFAULT; 1503ad8c0eaaSNicolas Ferre 1504ad8c0eaaSNicolas Ferre return 0; 1505ad8c0eaaSNicolas Ferre } 1506ad8c0eaaSNicolas Ferre 1507ab4382d2SGreg Kroah-Hartman /* 1508ab4382d2SGreg Kroah-Hartman * Called via sys_ioctl. We can use spin_lock_irq() here. 1509ab4382d2SGreg Kroah-Hartman */ 1510ab4382d2SGreg Kroah-Hartman static int 15114047b371SPeter Hurley uart_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg) 1512ab4382d2SGreg Kroah-Hartman { 1513ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1514ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 15154047b371SPeter Hurley struct uart_port *uport; 1516ab4382d2SGreg Kroah-Hartman void __user *uarg = (void __user *)arg; 1517ab4382d2SGreg Kroah-Hartman int ret = -ENOIOCTLCMD; 1518ab4382d2SGreg Kroah-Hartman 1519ab4382d2SGreg Kroah-Hartman 1520ab4382d2SGreg Kroah-Hartman /* 1521ab4382d2SGreg Kroah-Hartman * These ioctls don't rely on the hardware to be present. 1522ab4382d2SGreg Kroah-Hartman */ 1523ab4382d2SGreg Kroah-Hartman switch (cmd) { 1524ab4382d2SGreg Kroah-Hartman case TIOCSERCONFIG: 15257c8ab967SPeter Hurley down_write(&tty->termios_rwsem); 1526ab4382d2SGreg Kroah-Hartman ret = uart_do_autoconfig(tty, state); 15277c8ab967SPeter Hurley up_write(&tty->termios_rwsem); 1528ab4382d2SGreg Kroah-Hartman break; 1529ab4382d2SGreg Kroah-Hartman } 1530ab4382d2SGreg Kroah-Hartman 1531ab4382d2SGreg Kroah-Hartman if (ret != -ENOIOCTLCMD) 1532ab4382d2SGreg Kroah-Hartman goto out; 1533ab4382d2SGreg Kroah-Hartman 153418900ca6SPeter Hurley if (tty_io_error(tty)) { 1535ab4382d2SGreg Kroah-Hartman ret = -EIO; 1536ab4382d2SGreg Kroah-Hartman goto out; 1537ab4382d2SGreg Kroah-Hartman } 1538ab4382d2SGreg Kroah-Hartman 1539ab4382d2SGreg Kroah-Hartman /* 1540ab4382d2SGreg Kroah-Hartman * The following should only be used when hardware is present. 1541ab4382d2SGreg Kroah-Hartman */ 1542ab4382d2SGreg Kroah-Hartman switch (cmd) { 1543ab4382d2SGreg Kroah-Hartman case TIOCMIWAIT: 1544ab4382d2SGreg Kroah-Hartman ret = uart_wait_modem_status(state, arg); 1545ab4382d2SGreg Kroah-Hartman break; 1546ab4382d2SGreg Kroah-Hartman } 1547ab4382d2SGreg Kroah-Hartman 1548ab4382d2SGreg Kroah-Hartman if (ret != -ENOIOCTLCMD) 1549ab4382d2SGreg Kroah-Hartman goto out; 1550ab4382d2SGreg Kroah-Hartman 1551ae50bb27SIlpo Järvinen /* rs485_config requires more locking than others */ 1552ae50bb27SIlpo Järvinen if (cmd == TIOCGRS485) 1553ae50bb27SIlpo Järvinen down_write(&tty->termios_rwsem); 1554ae50bb27SIlpo Järvinen 1555ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 15564047b371SPeter Hurley uport = uart_port_check(state); 1557ab4382d2SGreg Kroah-Hartman 15584047b371SPeter Hurley if (!uport || tty_io_error(tty)) { 1559ab4382d2SGreg Kroah-Hartman ret = -EIO; 1560ab4382d2SGreg Kroah-Hartman goto out_up; 1561ab4382d2SGreg Kroah-Hartman } 1562ab4382d2SGreg Kroah-Hartman 1563ab4382d2SGreg Kroah-Hartman /* 1564ab4382d2SGreg Kroah-Hartman * All these rely on hardware being present and need to be 1565ab4382d2SGreg Kroah-Hartman * protected against the tty being hung up. 1566ab4382d2SGreg Kroah-Hartman */ 1567a9c20a9cSRicardo Ribalda Delgado 1568ab4382d2SGreg Kroah-Hartman switch (cmd) { 1569a9c20a9cSRicardo Ribalda Delgado case TIOCSERGETLSR: /* Get line status register */ 1570a9c20a9cSRicardo Ribalda Delgado ret = uart_get_lsr_info(tty, state, uarg); 1571a9c20a9cSRicardo Ribalda Delgado break; 1572a9c20a9cSRicardo Ribalda Delgado 1573a5f276f1SRicardo Ribalda Delgado case TIOCGRS485: 15744047b371SPeter Hurley ret = uart_get_rs485_config(uport, uarg); 1575a5f276f1SRicardo Ribalda Delgado break; 1576a5f276f1SRicardo Ribalda Delgado 1577a5f276f1SRicardo Ribalda Delgado case TIOCSRS485: 1578ae50bb27SIlpo Järvinen ret = uart_set_rs485_config(tty, uport, uarg); 1579a5f276f1SRicardo Ribalda Delgado break; 1580ad8c0eaaSNicolas Ferre 1581ad8c0eaaSNicolas Ferre case TIOCSISO7816: 1582ad8c0eaaSNicolas Ferre ret = uart_set_iso7816_config(state->uart_port, uarg); 1583ad8c0eaaSNicolas Ferre break; 1584ad8c0eaaSNicolas Ferre 1585ad8c0eaaSNicolas Ferre case TIOCGISO7816: 1586ad8c0eaaSNicolas Ferre ret = uart_get_iso7816_config(state->uart_port, uarg); 1587ad8c0eaaSNicolas Ferre break; 15884047b371SPeter Hurley default: 1589ab4382d2SGreg Kroah-Hartman if (uport->ops->ioctl) 1590ab4382d2SGreg Kroah-Hartman ret = uport->ops->ioctl(uport, cmd, arg); 1591ab4382d2SGreg Kroah-Hartman break; 1592ab4382d2SGreg Kroah-Hartman } 1593ab4382d2SGreg Kroah-Hartman out_up: 1594ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1595ae50bb27SIlpo Järvinen if (cmd == TIOCGRS485) 1596ae50bb27SIlpo Järvinen up_write(&tty->termios_rwsem); 1597ab4382d2SGreg Kroah-Hartman out: 1598ab4382d2SGreg Kroah-Hartman return ret; 1599ab4382d2SGreg Kroah-Hartman } 1600ab4382d2SGreg Kroah-Hartman 1601ab4382d2SGreg Kroah-Hartman static void uart_set_ldisc(struct tty_struct *tty) 1602ab4382d2SGreg Kroah-Hartman { 1603ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 16044047b371SPeter Hurley struct uart_port *uport; 16052f70e49eSAlexey Kardashevskiy struct tty_port *port = &state->port; 16062f70e49eSAlexey Kardashevskiy 16072f70e49eSAlexey Kardashevskiy if (!tty_port_initialized(port)) 16082f70e49eSAlexey Kardashevskiy return; 1609ab4382d2SGreg Kroah-Hartman 1610db1b9dfcSPeter Hurley mutex_lock(&state->port.mutex); 16114047b371SPeter Hurley uport = uart_port_check(state); 16124047b371SPeter Hurley if (uport && uport->ops->set_ldisc) 1613732a84a0SPeter Hurley uport->ops->set_ldisc(uport, &tty->termios); 1614db1b9dfcSPeter Hurley mutex_unlock(&state->port.mutex); 1615db1b9dfcSPeter Hurley } 1616ab4382d2SGreg Kroah-Hartman 1617ab4382d2SGreg Kroah-Hartman static void uart_set_termios(struct tty_struct *tty, 1618a8c11c15SIlpo Järvinen const struct ktermios *old_termios) 1619ab4382d2SGreg Kroah-Hartman { 1620ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 16214047b371SPeter Hurley struct uart_port *uport; 1622adc8d746SAlan Cox unsigned int cflag = tty->termios.c_cflag; 16232cbacafdSRussell King unsigned int iflag_mask = IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK; 16242cbacafdSRussell King bool sw_changed = false; 1625ab4382d2SGreg Kroah-Hartman 16264047b371SPeter Hurley mutex_lock(&state->port.mutex); 16274047b371SPeter Hurley uport = uart_port_check(state); 16284047b371SPeter Hurley if (!uport) 16294047b371SPeter Hurley goto out; 16304047b371SPeter Hurley 16312cbacafdSRussell King /* 16322cbacafdSRussell King * Drivers doing software flow control also need to know 16332cbacafdSRussell King * about changes to these input settings. 16342cbacafdSRussell King */ 16352cbacafdSRussell King if (uport->flags & UPF_SOFT_FLOW) { 16362cbacafdSRussell King iflag_mask |= IXANY|IXON|IXOFF; 16372cbacafdSRussell King sw_changed = 16382cbacafdSRussell King tty->termios.c_cc[VSTART] != old_termios->c_cc[VSTART] || 16392cbacafdSRussell King tty->termios.c_cc[VSTOP] != old_termios->c_cc[VSTOP]; 16402cbacafdSRussell King } 1641ab4382d2SGreg Kroah-Hartman 1642ab4382d2SGreg Kroah-Hartman /* 1643ab4382d2SGreg Kroah-Hartman * These are the bits that are used to setup various 1644ab4382d2SGreg Kroah-Hartman * flags in the low level driver. We can ignore the Bfoo 1645ab4382d2SGreg Kroah-Hartman * bits in c_cflag; c_[io]speed will always be set 1646ab4382d2SGreg Kroah-Hartman * appropriately by set_termios() in tty_ioctl.c 1647ab4382d2SGreg Kroah-Hartman */ 1648ab4382d2SGreg Kroah-Hartman if ((cflag ^ old_termios->c_cflag) == 0 && 1649adc8d746SAlan Cox tty->termios.c_ospeed == old_termios->c_ospeed && 1650adc8d746SAlan Cox tty->termios.c_ispeed == old_termios->c_ispeed && 16512cbacafdSRussell King ((tty->termios.c_iflag ^ old_termios->c_iflag) & iflag_mask) == 0 && 16522cbacafdSRussell King !sw_changed) { 16534047b371SPeter Hurley goto out; 1654ab4382d2SGreg Kroah-Hartman } 1655ab4382d2SGreg Kroah-Hartman 1656826736a6SIlpo Järvinen uart_change_line_settings(tty, state, old_termios); 1657c7a6b9e4SHariprasad Kelam /* reload cflag from termios; port driver may have overridden flags */ 1658c18b55fdSPeter Hurley cflag = tty->termios.c_cflag; 1659ab4382d2SGreg Kroah-Hartman 1660ab4382d2SGreg Kroah-Hartman /* Handle transition to B0 status */ 1661807fccf7SIlpo Järvinen if (((old_termios->c_cflag & CBAUD) != B0) && ((cflag & CBAUD) == B0)) 1662dec94e70SRussell King uart_clear_mctrl(uport, TIOCM_RTS | TIOCM_DTR); 1663ab4382d2SGreg Kroah-Hartman /* Handle transition away from B0 status */ 1664807fccf7SIlpo Järvinen else if (((old_termios->c_cflag & CBAUD) == B0) && ((cflag & CBAUD) != B0)) { 1665ab4382d2SGreg Kroah-Hartman unsigned int mask = TIOCM_DTR; 16664ed71addSTamseel Shams 166797ef38b8SPeter Hurley if (!(cflag & CRTSCTS) || !tty_throttled(tty)) 1668ab4382d2SGreg Kroah-Hartman mask |= TIOCM_RTS; 1669dec94e70SRussell King uart_set_mctrl(uport, mask); 1670ab4382d2SGreg Kroah-Hartman } 16714047b371SPeter Hurley out: 16724047b371SPeter Hurley mutex_unlock(&state->port.mutex); 1673ab4382d2SGreg Kroah-Hartman } 1674ab4382d2SGreg Kroah-Hartman 1675ab4382d2SGreg Kroah-Hartman /* 1676ef4f527cSKevin Cernekee * Calls to uart_close() are serialised via the tty_lock in 1677ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:tty_release() 1678ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:do_tty_hangup() 1679ab4382d2SGreg Kroah-Hartman */ 1680ab4382d2SGreg Kroah-Hartman static void uart_close(struct tty_struct *tty, struct file *filp) 1681ab4382d2SGreg Kroah-Hartman { 1682ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1683ab4382d2SGreg Kroah-Hartman 168491b32f54SPeter Hurley if (!state) { 168591b32f54SPeter Hurley struct uart_driver *drv = tty->driver->driver_state; 16869356335fSColin Ian King struct tty_port *port; 168791b32f54SPeter Hurley 168891b32f54SPeter Hurley state = drv->state + tty->index; 168991b32f54SPeter Hurley port = &state->port; 169091b32f54SPeter Hurley spin_lock_irq(&port->lock); 169191b32f54SPeter Hurley --port->count; 169291b32f54SPeter Hurley spin_unlock_irq(&port->lock); 1693ab4382d2SGreg Kroah-Hartman return; 169491b32f54SPeter Hurley } 1695ab4382d2SGreg Kroah-Hartman 169639b3d892SPeter Hurley pr_debug("uart_close(%d) called\n", tty->index); 1697ab4382d2SGreg Kroah-Hartman 1698761ed4a9SRob Herring tty_port_close(tty->port, tty, filp); 1699761ed4a9SRob Herring } 1700ab4382d2SGreg Kroah-Hartman 1701761ed4a9SRob Herring static void uart_tty_port_shutdown(struct tty_port *port) 1702761ed4a9SRob Herring { 1703761ed4a9SRob Herring struct uart_state *state = container_of(port, struct uart_state, port); 1704761ed4a9SRob Herring struct uart_port *uport = uart_port_check(state); 170500de977fSJohan Hovold char *buf; 1706af224ca2SPeter Hurley 1707ab4382d2SGreg Kroah-Hartman /* 1708ab4382d2SGreg Kroah-Hartman * At this point, we stop accepting input. To do this, we 1709ab4382d2SGreg Kroah-Hartman * disable the receive line status interrupts. 1710ab4382d2SGreg Kroah-Hartman */ 1711a5a2b130SAndy Shevchenko if (WARN(!uport, "detached port still initialized!\n")) 1712a5a2b130SAndy Shevchenko return; 1713761ed4a9SRob Herring 1714a5a2b130SAndy Shevchenko spin_lock_irq(&uport->lock); 1715ab4382d2SGreg Kroah-Hartman uport->ops->stop_rx(uport); 17166fb98fb3SPeter Hurley spin_unlock_irq(&uport->lock); 1717761ed4a9SRob Herring 1718761ed4a9SRob Herring uart_port_shutdown(port); 1719761ed4a9SRob Herring 1720ab4382d2SGreg Kroah-Hartman /* 1721761ed4a9SRob Herring * It's possible for shutdown to be called after suspend if we get 1722761ed4a9SRob Herring * a DCD drop (hangup) at just the right time. Clear suspended bit so 1723761ed4a9SRob Herring * we don't try to resume a port that has been shutdown. 1724ab4382d2SGreg Kroah-Hartman */ 172575b20a2aSIlpo Järvinen tty_port_set_suspended(port, false); 1726ab4382d2SGreg Kroah-Hartman 172700de977fSJohan Hovold /* 172800de977fSJohan Hovold * Free the transmit buffer. 172900de977fSJohan Hovold */ 173000de977fSJohan Hovold spin_lock_irq(&uport->lock); 173100de977fSJohan Hovold buf = state->xmit.buf; 173200de977fSJohan Hovold state->xmit.buf = NULL; 173300de977fSJohan Hovold spin_unlock_irq(&uport->lock); 1734ab4382d2SGreg Kroah-Hartman 173500de977fSJohan Hovold free_page((unsigned long)buf); 173600de977fSJohan Hovold 173700de977fSJohan Hovold uart_change_pm(state, UART_PM_STATE_OFF); 1738ab4382d2SGreg Kroah-Hartman } 1739ab4382d2SGreg Kroah-Hartman 17401f33a51dSJiri Slaby static void uart_wait_until_sent(struct tty_struct *tty, int timeout) 1741ab4382d2SGreg Kroah-Hartman { 17421f33a51dSJiri Slaby struct uart_state *state = tty->driver_data; 17439ed19428SPeter Hurley struct uart_port *port; 1744f9008285SIlpo Järvinen unsigned long char_time, expire, fifo_timeout; 1745ab4382d2SGreg Kroah-Hartman 17469ed19428SPeter Hurley port = uart_port_ref(state); 1747ef510beaSAndy Shevchenko if (!port) 1748ef510beaSAndy Shevchenko return; 1749ef510beaSAndy Shevchenko 1750ef510beaSAndy Shevchenko if (port->type == PORT_UNKNOWN || port->fifosize == 0) { 17519ed19428SPeter Hurley uart_port_deref(port); 1752ab4382d2SGreg Kroah-Hartman return; 17539ed19428SPeter Hurley } 1754ab4382d2SGreg Kroah-Hartman 1755ab4382d2SGreg Kroah-Hartman /* 1756ab4382d2SGreg Kroah-Hartman * Set the check interval to be 1/5 of the estimated time to 1757ab4382d2SGreg Kroah-Hartman * send a single character, and make it at least 1. The check 1758ab4382d2SGreg Kroah-Hartman * interval should also be less than the timeout. 1759ab4382d2SGreg Kroah-Hartman * 1760ab4382d2SGreg Kroah-Hartman * Note: we have to use pretty tight timings here to satisfy 1761ab4382d2SGreg Kroah-Hartman * the NIST-PCTS. 1762ab4382d2SGreg Kroah-Hartman */ 176331f6bd7fSIlpo Järvinen char_time = max(nsecs_to_jiffies(port->frame_time / 5), 1UL); 176431f6bd7fSIlpo Järvinen 1765ab4382d2SGreg Kroah-Hartman if (timeout && timeout < char_time) 1766ab4382d2SGreg Kroah-Hartman char_time = timeout; 1767ab4382d2SGreg Kroah-Hartman 1768b0e0bd9dSTomasz Moń if (!uart_cts_enabled(port)) { 1769ab4382d2SGreg Kroah-Hartman /* 1770ab4382d2SGreg Kroah-Hartman * If the transmitter hasn't cleared in twice the approximate 1771ab4382d2SGreg Kroah-Hartman * amount of time to send the entire FIFO, it probably won't 1772ab4382d2SGreg Kroah-Hartman * ever clear. This assumes the UART isn't doing flow 1773ab4382d2SGreg Kroah-Hartman * control, which is currently the case. Hence, if it ever 1774f9008285SIlpo Järvinen * takes longer than FIFO timeout, this is probably due to a 1775ab4382d2SGreg Kroah-Hartman * UART bug of some kind. So, we clamp the timeout parameter at 1776f9008285SIlpo Järvinen * 2 * FIFO timeout. 1777ab4382d2SGreg Kroah-Hartman */ 1778f9008285SIlpo Järvinen fifo_timeout = uart_fifo_timeout(port); 1779f9008285SIlpo Järvinen if (timeout == 0 || timeout > 2 * fifo_timeout) 1780f9008285SIlpo Järvinen timeout = 2 * fifo_timeout; 1781b0e0bd9dSTomasz Moń } 1782ab4382d2SGreg Kroah-Hartman 1783ab4382d2SGreg Kroah-Hartman expire = jiffies + timeout; 1784ab4382d2SGreg Kroah-Hartman 1785ab4382d2SGreg Kroah-Hartman pr_debug("uart_wait_until_sent(%d), jiffies=%lu, expire=%lu...\n", 1786ab4382d2SGreg Kroah-Hartman port->line, jiffies, expire); 1787ab4382d2SGreg Kroah-Hartman 1788ab4382d2SGreg Kroah-Hartman /* 1789ab4382d2SGreg Kroah-Hartman * Check whether the transmitter is empty every 'char_time'. 1790ab4382d2SGreg Kroah-Hartman * 'timeout' / 'expire' give us the maximum amount of time 1791ab4382d2SGreg Kroah-Hartman * we wait. 1792ab4382d2SGreg Kroah-Hartman */ 1793ab4382d2SGreg Kroah-Hartman while (!port->ops->tx_empty(port)) { 1794ab4382d2SGreg Kroah-Hartman msleep_interruptible(jiffies_to_msecs(char_time)); 1795ab4382d2SGreg Kroah-Hartman if (signal_pending(current)) 1796ab4382d2SGreg Kroah-Hartman break; 1797b0e0bd9dSTomasz Moń if (timeout && time_after(jiffies, expire)) 1798ab4382d2SGreg Kroah-Hartman break; 1799ab4382d2SGreg Kroah-Hartman } 18009ed19428SPeter Hurley uart_port_deref(port); 1801ab4382d2SGreg Kroah-Hartman } 1802ab4382d2SGreg Kroah-Hartman 1803ab4382d2SGreg Kroah-Hartman /* 1804ef4f527cSKevin Cernekee * Calls to uart_hangup() are serialised by the tty_lock in 1805ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:do_tty_hangup() 1806ef4f527cSKevin Cernekee * This runs from a workqueue and can sleep for a _short_ time only. 1807ab4382d2SGreg Kroah-Hartman */ 1808ab4382d2SGreg Kroah-Hartman static void uart_hangup(struct tty_struct *tty) 1809ab4382d2SGreg Kroah-Hartman { 1810ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1811ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1812af224ca2SPeter Hurley struct uart_port *uport; 1813ab4382d2SGreg Kroah-Hartman unsigned long flags; 1814ab4382d2SGreg Kroah-Hartman 181539b3d892SPeter Hurley pr_debug("uart_hangup(%d)\n", tty->index); 1816ab4382d2SGreg Kroah-Hartman 1817ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1818af224ca2SPeter Hurley uport = uart_port_check(state); 1819af224ca2SPeter Hurley WARN(!uport, "hangup of detached port!\n"); 1820af224ca2SPeter Hurley 1821807c8d81SPeter Hurley if (tty_port_active(port)) { 1822ab4382d2SGreg Kroah-Hartman uart_flush_buffer(tty); 1823ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 1824ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 1825ab4382d2SGreg Kroah-Hartman port->count = 0; 1826ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 18279b5aa549SIlpo Järvinen tty_port_set_active(port, false); 1828ab4382d2SGreg Kroah-Hartman tty_port_tty_set(port, NULL); 1829af224ca2SPeter Hurley if (uport && !uart_console(uport)) 1830bf903c0cSGeert Uytterhoeven uart_change_pm(state, UART_PM_STATE_OFF); 1831ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->open_wait); 1832ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->delta_msr_wait); 1833ab4382d2SGreg Kroah-Hartman } 1834ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1835ab4382d2SGreg Kroah-Hartman } 1836ab4382d2SGreg Kroah-Hartman 1837af224ca2SPeter Hurley /* uport == NULL if uart_port has already been removed */ 18380b1db830SJiri Slaby static void uart_port_shutdown(struct tty_port *port) 18390b1db830SJiri Slaby { 1840b922e19dSJiri Slaby struct uart_state *state = container_of(port, struct uart_state, port); 18414047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 1842b922e19dSJiri Slaby 1843b922e19dSJiri Slaby /* 1844b922e19dSJiri Slaby * clear delta_msr_wait queue to avoid mem leaks: we may free 1845b922e19dSJiri Slaby * the irq here so the queue might never be woken up. Note 1846b922e19dSJiri Slaby * that we won't end up waiting on delta_msr_wait again since 1847b922e19dSJiri Slaby * any outstanding file descriptors should be pointing at 1848b922e19dSJiri Slaby * hung_up_tty_fops now. 1849b922e19dSJiri Slaby */ 1850b922e19dSJiri Slaby wake_up_interruptible(&port->delta_msr_wait); 1851b922e19dSJiri Slaby 18522765852eSJiri Slaby if (uport) { 18532765852eSJiri Slaby /* Free the IRQ and disable the port. */ 1854b922e19dSJiri Slaby uport->ops->shutdown(uport); 1855b922e19dSJiri Slaby 18562765852eSJiri Slaby /* Ensure that the IRQ handler isn't running on another CPU. */ 1857b922e19dSJiri Slaby synchronize_irq(uport->irq); 18580b1db830SJiri Slaby } 18592765852eSJiri Slaby } 18600b1db830SJiri Slaby 1861b300fb26SIlpo Järvinen static bool uart_carrier_raised(struct tty_port *port) 1862ab4382d2SGreg Kroah-Hartman { 1863ab4382d2SGreg Kroah-Hartman struct uart_state *state = container_of(port, struct uart_state, port); 18649ed19428SPeter Hurley struct uart_port *uport; 1865ab4382d2SGreg Kroah-Hartman int mctrl; 18669ed19428SPeter Hurley 18679ed19428SPeter Hurley uport = uart_port_ref(state); 18689ed19428SPeter Hurley /* 18699ed19428SPeter Hurley * Should never observe uport == NULL since checks for hangup should 18709ed19428SPeter Hurley * abort the tty_port_block_til_ready() loop before checking for carrier 18719ed19428SPeter Hurley * raised -- but report carrier raised if it does anyway so open will 18729ed19428SPeter Hurley * continue and not sleep 18739ed19428SPeter Hurley */ 18749ed19428SPeter Hurley if (WARN_ON(!uport)) 1875b300fb26SIlpo Järvinen return true; 1876ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 18771fdc3106SAlexander Shiyan uart_enable_ms(uport); 1878ab4382d2SGreg Kroah-Hartman mctrl = uport->ops->get_mctrl(uport); 1879ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 18809ed19428SPeter Hurley uart_port_deref(uport); 1881b300fb26SIlpo Järvinen 1882b300fb26SIlpo Järvinen return mctrl & TIOCM_CAR; 1883ab4382d2SGreg Kroah-Hartman } 1884ab4382d2SGreg Kroah-Hartman 18855701cb8bSIlpo Järvinen static void uart_dtr_rts(struct tty_port *port, bool active) 1886ab4382d2SGreg Kroah-Hartman { 1887ab4382d2SGreg Kroah-Hartman struct uart_state *state = container_of(port, struct uart_state, port); 18889ed19428SPeter Hurley struct uart_port *uport; 18899ed19428SPeter Hurley 18909ed19428SPeter Hurley uport = uart_port_ref(state); 18919ed19428SPeter Hurley if (!uport) 18929ed19428SPeter Hurley return; 18935701cb8bSIlpo Järvinen uart_port_dtr_rts(uport, active); 18949ed19428SPeter Hurley uart_port_deref(uport); 1895ab4382d2SGreg Kroah-Hartman } 1896ab4382d2SGreg Kroah-Hartman 18974cdd17baSJiri Slaby static int uart_install(struct tty_driver *driver, struct tty_struct *tty) 18984cdd17baSJiri Slaby { 18994cdd17baSJiri Slaby struct uart_driver *drv = driver->driver_state; 19004cdd17baSJiri Slaby struct uart_state *state = drv->state + tty->index; 19014cdd17baSJiri Slaby 19024cdd17baSJiri Slaby tty->driver_data = state; 19034cdd17baSJiri Slaby 19044cdd17baSJiri Slaby return tty_standard_install(driver, tty); 19054cdd17baSJiri Slaby } 19064cdd17baSJiri Slaby 1907ab4382d2SGreg Kroah-Hartman /* 1908ef4f527cSKevin Cernekee * Calls to uart_open are serialised by the tty_lock in 1909ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:tty_open() 1910ab4382d2SGreg Kroah-Hartman * Note that if this fails, then uart_close() _will_ be called. 1911ab4382d2SGreg Kroah-Hartman * 1912ab4382d2SGreg Kroah-Hartman * In time, we want to scrap the "opening nonpresent ports" 1913ab4382d2SGreg Kroah-Hartman * behaviour and implement an alternative way for setserial 1914ab4382d2SGreg Kroah-Hartman * to set base addresses/ports/types. This will allow us to 1915ab4382d2SGreg Kroah-Hartman * get rid of a certain amount of extra tests. 1916ab4382d2SGreg Kroah-Hartman */ 1917ab4382d2SGreg Kroah-Hartman static int uart_open(struct tty_struct *tty, struct file *filp) 1918ab4382d2SGreg Kroah-Hartman { 19194cdd17baSJiri Slaby struct uart_state *state = tty->driver_data; 19204cdd17baSJiri Slaby int retval; 1921b3b57646SRob Herring 1922b3b57646SRob Herring retval = tty_port_open(&state->port, tty, filp); 1923b3b57646SRob Herring if (retval > 0) 1924b3b57646SRob Herring retval = 0; 1925b3b57646SRob Herring 1926b3b57646SRob Herring return retval; 1927b3b57646SRob Herring } 1928b3b57646SRob Herring 1929b3b57646SRob Herring static int uart_port_activate(struct tty_port *port, struct tty_struct *tty) 1930b3b57646SRob Herring { 1931b3b57646SRob Herring struct uart_state *state = container_of(port, struct uart_state, port); 1932b3b57646SRob Herring struct uart_port *uport; 193313b18d35SSerge Semin int ret; 1934b3b57646SRob Herring 1935b3b57646SRob Herring uport = uart_port_check(state); 1936b3b57646SRob Herring if (!uport || uport->flags & UPF_DEAD) 1937b3b57646SRob Herring return -ENXIO; 1938b3b57646SRob Herring 1939ab4382d2SGreg Kroah-Hartman /* 1940ab4382d2SGreg Kroah-Hartman * Start up the serial port. 1941ab4382d2SGreg Kroah-Hartman */ 1942dcd794c6SIlpo Järvinen ret = uart_startup(tty, state, false); 194313b18d35SSerge Semin if (ret > 0) 19449b5aa549SIlpo Järvinen tty_port_set_active(port, true); 194513b18d35SSerge Semin 194613b18d35SSerge Semin return ret; 1947ab4382d2SGreg Kroah-Hartman } 1948ab4382d2SGreg Kroah-Hartman 1949ab4382d2SGreg Kroah-Hartman static const char *uart_type(struct uart_port *port) 1950ab4382d2SGreg Kroah-Hartman { 1951ab4382d2SGreg Kroah-Hartman const char *str = NULL; 1952ab4382d2SGreg Kroah-Hartman 1953ab4382d2SGreg Kroah-Hartman if (port->ops->type) 1954ab4382d2SGreg Kroah-Hartman str = port->ops->type(port); 1955ab4382d2SGreg Kroah-Hartman 1956ab4382d2SGreg Kroah-Hartman if (!str) 1957ab4382d2SGreg Kroah-Hartman str = "unknown"; 1958ab4382d2SGreg Kroah-Hartman 1959ab4382d2SGreg Kroah-Hartman return str; 1960ab4382d2SGreg Kroah-Hartman } 1961ab4382d2SGreg Kroah-Hartman 1962ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_PROC_FS 1963ab4382d2SGreg Kroah-Hartman 1964ab4382d2SGreg Kroah-Hartman static void uart_line_info(struct seq_file *m, struct uart_driver *drv, int i) 1965ab4382d2SGreg Kroah-Hartman { 1966ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + i; 1967ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 19686f538fe3SLinus Walleij enum uart_pm_state pm_state; 19694047b371SPeter Hurley struct uart_port *uport; 1970ab4382d2SGreg Kroah-Hartman char stat_buf[32]; 1971ab4382d2SGreg Kroah-Hartman unsigned int status; 1972ab4382d2SGreg Kroah-Hartman int mmio; 1973ab4382d2SGreg Kroah-Hartman 19744047b371SPeter Hurley mutex_lock(&port->mutex); 19754047b371SPeter Hurley uport = uart_port_check(state); 1976ab4382d2SGreg Kroah-Hartman if (!uport) 19774047b371SPeter Hurley goto out; 1978ab4382d2SGreg Kroah-Hartman 1979ab4382d2SGreg Kroah-Hartman mmio = uport->iotype >= UPIO_MEM; 1980ab4382d2SGreg Kroah-Hartman seq_printf(m, "%d: uart:%s %s%08llX irq:%d", 1981ab4382d2SGreg Kroah-Hartman uport->line, uart_type(uport), 1982ab4382d2SGreg Kroah-Hartman mmio ? "mmio:0x" : "port:", 1983ab4382d2SGreg Kroah-Hartman mmio ? (unsigned long long)uport->mapbase 1984ab4382d2SGreg Kroah-Hartman : (unsigned long long)uport->iobase, 1985ab4382d2SGreg Kroah-Hartman uport->irq); 1986ab4382d2SGreg Kroah-Hartman 1987ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) { 1988ab4382d2SGreg Kroah-Hartman seq_putc(m, '\n'); 19894047b371SPeter Hurley goto out; 1990ab4382d2SGreg Kroah-Hartman } 1991ab4382d2SGreg Kroah-Hartman 1992ab4382d2SGreg Kroah-Hartman if (capable(CAP_SYS_ADMIN)) { 1993ab4382d2SGreg Kroah-Hartman pm_state = state->pm_state; 19946f538fe3SLinus Walleij if (pm_state != UART_PM_STATE_ON) 19956f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 1996ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1997ab4382d2SGreg Kroah-Hartman status = uport->ops->get_mctrl(uport); 1998ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 19996f538fe3SLinus Walleij if (pm_state != UART_PM_STATE_ON) 2000ab4382d2SGreg Kroah-Hartman uart_change_pm(state, pm_state); 2001ab4382d2SGreg Kroah-Hartman 2002ab4382d2SGreg Kroah-Hartman seq_printf(m, " tx:%d rx:%d", 2003ab4382d2SGreg Kroah-Hartman uport->icount.tx, uport->icount.rx); 2004ab4382d2SGreg Kroah-Hartman if (uport->icount.frame) 2005968af298SPeter Hurley seq_printf(m, " fe:%d", uport->icount.frame); 2006ab4382d2SGreg Kroah-Hartman if (uport->icount.parity) 2007968af298SPeter Hurley seq_printf(m, " pe:%d", uport->icount.parity); 2008ab4382d2SGreg Kroah-Hartman if (uport->icount.brk) 2009968af298SPeter Hurley seq_printf(m, " brk:%d", uport->icount.brk); 2010ab4382d2SGreg Kroah-Hartman if (uport->icount.overrun) 2011968af298SPeter Hurley seq_printf(m, " oe:%d", uport->icount.overrun); 20124f794097SJeremy Kerr if (uport->icount.buf_overrun) 20134f794097SJeremy Kerr seq_printf(m, " bo:%d", uport->icount.buf_overrun); 2014ab4382d2SGreg Kroah-Hartman 2015ab4382d2SGreg Kroah-Hartman #define INFOBIT(bit, str) \ 2016ab4382d2SGreg Kroah-Hartman if (uport->mctrl & (bit)) \ 2017ab4382d2SGreg Kroah-Hartman strncat(stat_buf, (str), sizeof(stat_buf) - \ 2018ab4382d2SGreg Kroah-Hartman strlen(stat_buf) - 2) 2019ab4382d2SGreg Kroah-Hartman #define STATBIT(bit, str) \ 2020ab4382d2SGreg Kroah-Hartman if (status & (bit)) \ 2021ab4382d2SGreg Kroah-Hartman strncat(stat_buf, (str), sizeof(stat_buf) - \ 2022ab4382d2SGreg Kroah-Hartman strlen(stat_buf) - 2) 2023ab4382d2SGreg Kroah-Hartman 2024ab4382d2SGreg Kroah-Hartman stat_buf[0] = '\0'; 2025ab4382d2SGreg Kroah-Hartman stat_buf[1] = '\0'; 2026ab4382d2SGreg Kroah-Hartman INFOBIT(TIOCM_RTS, "|RTS"); 2027ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_CTS, "|CTS"); 2028ab4382d2SGreg Kroah-Hartman INFOBIT(TIOCM_DTR, "|DTR"); 2029ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_DSR, "|DSR"); 2030ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_CAR, "|CD"); 2031ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_RNG, "|RI"); 2032ab4382d2SGreg Kroah-Hartman if (stat_buf[0]) 2033ab4382d2SGreg Kroah-Hartman stat_buf[0] = ' '; 2034ab4382d2SGreg Kroah-Hartman 2035ab4382d2SGreg Kroah-Hartman seq_puts(m, stat_buf); 2036ab4382d2SGreg Kroah-Hartman } 2037ab4382d2SGreg Kroah-Hartman seq_putc(m, '\n'); 2038ab4382d2SGreg Kroah-Hartman #undef STATBIT 2039ab4382d2SGreg Kroah-Hartman #undef INFOBIT 20404047b371SPeter Hurley out: 20414047b371SPeter Hurley mutex_unlock(&port->mutex); 2042ab4382d2SGreg Kroah-Hartman } 2043ab4382d2SGreg Kroah-Hartman 2044ab4382d2SGreg Kroah-Hartman static int uart_proc_show(struct seq_file *m, void *v) 2045ab4382d2SGreg Kroah-Hartman { 2046ab4382d2SGreg Kroah-Hartman struct tty_driver *ttydrv = m->private; 2047ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = ttydrv->driver_state; 2048ab4382d2SGreg Kroah-Hartman int i; 2049ab4382d2SGreg Kroah-Hartman 2050968af298SPeter Hurley seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n", "", "", ""); 2051ab4382d2SGreg Kroah-Hartman for (i = 0; i < drv->nr; i++) 2052ab4382d2SGreg Kroah-Hartman uart_line_info(m, drv, i); 2053ab4382d2SGreg Kroah-Hartman return 0; 2054ab4382d2SGreg Kroah-Hartman } 2055ab4382d2SGreg Kroah-Hartman #endif 2056ab4382d2SGreg Kroah-Hartman 2057e0830dbfSJohan Hovold static void uart_port_spin_lock_init(struct uart_port *port) 2058f743061aSAndy Shevchenko { 2059f743061aSAndy Shevchenko spin_lock_init(&port->lock); 2060f743061aSAndy Shevchenko lockdep_set_class(&port->lock, &port_lock_key); 2061f743061aSAndy Shevchenko } 2062f743061aSAndy Shevchenko 2063ab4382d2SGreg Kroah-Hartman #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL) 20641cfe42b7SPeter Hurley /** 2065ab4382d2SGreg Kroah-Hartman * uart_console_write - write a console message to a serial port 2066ab4382d2SGreg Kroah-Hartman * @port: the port to write the message 2067ab4382d2SGreg Kroah-Hartman * @s: array of characters 2068ab4382d2SGreg Kroah-Hartman * @count: number of characters in string to write 206910afbe34SPeter Hurley * @putchar: function to write character to port 2070ab4382d2SGreg Kroah-Hartman */ 2071ab4382d2SGreg Kroah-Hartman void uart_console_write(struct uart_port *port, const char *s, 2072ab4382d2SGreg Kroah-Hartman unsigned int count, 20733f8bab17SJiri Slaby void (*putchar)(struct uart_port *, unsigned char)) 2074ab4382d2SGreg Kroah-Hartman { 2075ab4382d2SGreg Kroah-Hartman unsigned int i; 2076ab4382d2SGreg Kroah-Hartman 2077ab4382d2SGreg Kroah-Hartman for (i = 0; i < count; i++, s++) { 2078ab4382d2SGreg Kroah-Hartman if (*s == '\n') 2079ab4382d2SGreg Kroah-Hartman putchar(port, '\r'); 2080ab4382d2SGreg Kroah-Hartman putchar(port, *s); 2081ab4382d2SGreg Kroah-Hartman } 2082ab4382d2SGreg Kroah-Hartman } 2083ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_console_write); 2084ab4382d2SGreg Kroah-Hartman 20859e5f399fSJiri Slaby /** 20869e5f399fSJiri Slaby * uart_get_console - get uart port for console 20879e5f399fSJiri Slaby * @ports: ports to search in 20889e5f399fSJiri Slaby * @nr: number of @ports 20899e5f399fSJiri Slaby * @co: console to search for 20909e5f399fSJiri Slaby * Returns: uart_port for the console @co 20919e5f399fSJiri Slaby * 20929e5f399fSJiri Slaby * Check whether an invalid uart number has been specified (as @co->index), and 20939e5f399fSJiri Slaby * if so, search for the first available port that does have console support. 2094ab4382d2SGreg Kroah-Hartman */ 2095ab4382d2SGreg Kroah-Hartman struct uart_port * __init 2096ab4382d2SGreg Kroah-Hartman uart_get_console(struct uart_port *ports, int nr, struct console *co) 2097ab4382d2SGreg Kroah-Hartman { 2098ab4382d2SGreg Kroah-Hartman int idx = co->index; 2099ab4382d2SGreg Kroah-Hartman 2100ab4382d2SGreg Kroah-Hartman if (idx < 0 || idx >= nr || (ports[idx].iobase == 0 && 2101ab4382d2SGreg Kroah-Hartman ports[idx].membase == NULL)) 2102ab4382d2SGreg Kroah-Hartman for (idx = 0; idx < nr; idx++) 2103ab4382d2SGreg Kroah-Hartman if (ports[idx].iobase != 0 || 2104ab4382d2SGreg Kroah-Hartman ports[idx].membase != NULL) 2105ab4382d2SGreg Kroah-Hartman break; 2106ab4382d2SGreg Kroah-Hartman 2107ab4382d2SGreg Kroah-Hartman co->index = idx; 2108ab4382d2SGreg Kroah-Hartman 2109ab4382d2SGreg Kroah-Hartman return ports + idx; 2110ab4382d2SGreg Kroah-Hartman } 2111ab4382d2SGreg Kroah-Hartman 2112ab4382d2SGreg Kroah-Hartman /** 211373abaf87SPeter Hurley * uart_parse_earlycon - Parse earlycon options 211473abaf87SPeter Hurley * @p: ptr to 2nd field (ie., just beyond '<name>,') 211573abaf87SPeter Hurley * @iotype: ptr for decoded iotype (out) 211673abaf87SPeter Hurley * @addr: ptr for decoded mapbase/iobase (out) 2117987233b3SJiri Slaby * @options: ptr for <options> field; %NULL if not present (out) 211873abaf87SPeter Hurley * 2119987233b3SJiri Slaby * Decodes earlycon kernel command line parameters of the form: 2120987233b3SJiri Slaby * * earlycon=<name>,io|mmio|mmio16|mmio32|mmio32be|mmio32native,<addr>,<options> 2121987233b3SJiri Slaby * * console=<name>,io|mmio|mmio16|mmio32|mmio32be|mmio32native,<addr>,<options> 212273abaf87SPeter Hurley * 2123987233b3SJiri Slaby * The optional form: 2124987233b3SJiri Slaby * * earlycon=<name>,0x<addr>,<options> 2125987233b3SJiri Slaby * * console=<name>,0x<addr>,<options> 2126ff30283aSRandy Dunlap * 2127987233b3SJiri Slaby * is also accepted; the returned @iotype will be %UPIO_MEM. 2128ff30283aSRandy Dunlap * 2129987233b3SJiri Slaby * Returns: 0 on success or -%EINVAL on failure 213073abaf87SPeter Hurley */ 213146e36683SAlexander Sverdlin int uart_parse_earlycon(char *p, unsigned char *iotype, resource_size_t *addr, 213273abaf87SPeter Hurley char **options) 213373abaf87SPeter Hurley { 213473abaf87SPeter Hurley if (strncmp(p, "mmio,", 5) == 0) { 213573abaf87SPeter Hurley *iotype = UPIO_MEM; 213673abaf87SPeter Hurley p += 5; 2137bd94c407SMasahiro Yamada } else if (strncmp(p, "mmio16,", 7) == 0) { 2138bd94c407SMasahiro Yamada *iotype = UPIO_MEM16; 2139bd94c407SMasahiro Yamada p += 7; 214073abaf87SPeter Hurley } else if (strncmp(p, "mmio32,", 7) == 0) { 214173abaf87SPeter Hurley *iotype = UPIO_MEM32; 214273abaf87SPeter Hurley p += 7; 21436e63be3fSNoam Camus } else if (strncmp(p, "mmio32be,", 9) == 0) { 21446e63be3fSNoam Camus *iotype = UPIO_MEM32BE; 21456e63be3fSNoam Camus p += 9; 2146d215d809SMax Filippov } else if (strncmp(p, "mmio32native,", 13) == 0) { 2147d215d809SMax Filippov *iotype = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) ? 2148d215d809SMax Filippov UPIO_MEM32BE : UPIO_MEM32; 2149d215d809SMax Filippov p += 13; 215073abaf87SPeter Hurley } else if (strncmp(p, "io,", 3) == 0) { 215173abaf87SPeter Hurley *iotype = UPIO_PORT; 215273abaf87SPeter Hurley p += 3; 215373abaf87SPeter Hurley } else if (strncmp(p, "0x", 2) == 0) { 215473abaf87SPeter Hurley *iotype = UPIO_MEM; 215573abaf87SPeter Hurley } else { 215673abaf87SPeter Hurley return -EINVAL; 215773abaf87SPeter Hurley } 215873abaf87SPeter Hurley 21598b2303deSAlexander Sverdlin /* 21608b2303deSAlexander Sverdlin * Before you replace it with kstrtoull(), think about options separator 21618b2303deSAlexander Sverdlin * (',') it will not tolerate 21628b2303deSAlexander Sverdlin */ 21638b2303deSAlexander Sverdlin *addr = simple_strtoull(p, NULL, 0); 216473abaf87SPeter Hurley p = strchr(p, ','); 216573abaf87SPeter Hurley if (p) 216673abaf87SPeter Hurley p++; 216773abaf87SPeter Hurley 216873abaf87SPeter Hurley *options = p; 216973abaf87SPeter Hurley return 0; 217073abaf87SPeter Hurley } 217173abaf87SPeter Hurley EXPORT_SYMBOL_GPL(uart_parse_earlycon); 217273abaf87SPeter Hurley 217373abaf87SPeter Hurley /** 217402088ca6SGeert Uytterhoeven * uart_parse_options - Parse serial port baud/parity/bits/flow control. 2175ab4382d2SGreg Kroah-Hartman * @options: pointer to option string 2176ab4382d2SGreg Kroah-Hartman * @baud: pointer to an 'int' variable for the baud rate. 2177ab4382d2SGreg Kroah-Hartman * @parity: pointer to an 'int' variable for the parity. 2178ab4382d2SGreg Kroah-Hartman * @bits: pointer to an 'int' variable for the number of data bits. 2179ab4382d2SGreg Kroah-Hartman * @flow: pointer to an 'int' variable for the flow control character. 2180ab4382d2SGreg Kroah-Hartman * 2181987233b3SJiri Slaby * uart_parse_options() decodes a string containing the serial console 2182ab4382d2SGreg Kroah-Hartman * options. The format of the string is <baud><parity><bits><flow>, 2183ab4382d2SGreg Kroah-Hartman * eg: 115200n8r 2184ab4382d2SGreg Kroah-Hartman */ 2185ab4382d2SGreg Kroah-Hartman void 21860f646b63SPaul Cercueil uart_parse_options(const char *options, int *baud, int *parity, 21870f646b63SPaul Cercueil int *bits, int *flow) 2188ab4382d2SGreg Kroah-Hartman { 21890f646b63SPaul Cercueil const char *s = options; 2190ab4382d2SGreg Kroah-Hartman 2191ab4382d2SGreg Kroah-Hartman *baud = simple_strtoul(s, NULL, 10); 2192ab4382d2SGreg Kroah-Hartman while (*s >= '0' && *s <= '9') 2193ab4382d2SGreg Kroah-Hartman s++; 2194ab4382d2SGreg Kroah-Hartman if (*s) 2195ab4382d2SGreg Kroah-Hartman *parity = *s++; 2196ab4382d2SGreg Kroah-Hartman if (*s) 2197ab4382d2SGreg Kroah-Hartman *bits = *s++ - '0'; 2198ab4382d2SGreg Kroah-Hartman if (*s) 2199ab4382d2SGreg Kroah-Hartman *flow = *s; 2200ab4382d2SGreg Kroah-Hartman } 2201ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_parse_options); 2202ab4382d2SGreg Kroah-Hartman 2203ab4382d2SGreg Kroah-Hartman /** 2204ab4382d2SGreg Kroah-Hartman * uart_set_options - setup the serial console parameters 2205ab4382d2SGreg Kroah-Hartman * @port: pointer to the serial ports uart_port structure 2206ab4382d2SGreg Kroah-Hartman * @co: console pointer 2207ab4382d2SGreg Kroah-Hartman * @baud: baud rate 2208ab4382d2SGreg Kroah-Hartman * @parity: parity character - 'n' (none), 'o' (odd), 'e' (even) 2209ab4382d2SGreg Kroah-Hartman * @bits: number of data bits 2210ab4382d2SGreg Kroah-Hartman * @flow: flow control character - 'r' (rts) 22113ef5abd9SJohn Ogness * 22123ef5abd9SJohn Ogness * Locking: Caller must hold console_list_lock in order to serialize 22133ef5abd9SJohn Ogness * early initialization of the serial-console lock. 2214ab4382d2SGreg Kroah-Hartman */ 2215ab4382d2SGreg Kroah-Hartman int 2216ab4382d2SGreg Kroah-Hartman uart_set_options(struct uart_port *port, struct console *co, 2217ab4382d2SGreg Kroah-Hartman int baud, int parity, int bits, int flow) 2218ab4382d2SGreg Kroah-Hartman { 2219ab4382d2SGreg Kroah-Hartman struct ktermios termios; 2220ab4382d2SGreg Kroah-Hartman static struct ktermios dummy; 2221ab4382d2SGreg Kroah-Hartman 2222e0830dbfSJohan Hovold /* 2223e0830dbfSJohan Hovold * Ensure that the serial-console lock is initialised early. 2224e0830dbfSJohan Hovold * 2225452b9b24SJohn Ogness * Note that the console-registered check is needed because 2226452b9b24SJohn Ogness * kgdboc can call uart_set_options() for an already registered 2227e0830dbfSJohan Hovold * console via tty_find_polling_driver() and uart_poll_init(). 2228e0830dbfSJohan Hovold */ 2229452b9b24SJohn Ogness if (!uart_console_registered_locked(port) && !port->console_reinit) 2230d2403cadSAndy Shevchenko uart_port_spin_lock_init(port); 2231ab4382d2SGreg Kroah-Hartman 2232ab4382d2SGreg Kroah-Hartman memset(&termios, 0, sizeof(struct ktermios)); 2233ab4382d2SGreg Kroah-Hartman 2234ba47f97aSJeffy Chen termios.c_cflag |= CREAD | HUPCL | CLOCAL; 2235ba47f97aSJeffy Chen tty_termios_encode_baud_rate(&termios, baud, baud); 2236ab4382d2SGreg Kroah-Hartman 2237ab4382d2SGreg Kroah-Hartman if (bits == 7) 2238ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CS7; 2239ab4382d2SGreg Kroah-Hartman else 2240ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CS8; 2241ab4382d2SGreg Kroah-Hartman 2242ab4382d2SGreg Kroah-Hartman switch (parity) { 2243ab4382d2SGreg Kroah-Hartman case 'o': case 'O': 2244ab4382d2SGreg Kroah-Hartman termios.c_cflag |= PARODD; 2245df561f66SGustavo A. R. Silva fallthrough; 2246ab4382d2SGreg Kroah-Hartman case 'e': case 'E': 2247ab4382d2SGreg Kroah-Hartman termios.c_cflag |= PARENB; 2248ab4382d2SGreg Kroah-Hartman break; 2249ab4382d2SGreg Kroah-Hartman } 2250ab4382d2SGreg Kroah-Hartman 2251ab4382d2SGreg Kroah-Hartman if (flow == 'r') 2252ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CRTSCTS; 2253ab4382d2SGreg Kroah-Hartman 2254ab4382d2SGreg Kroah-Hartman /* 2255ab4382d2SGreg Kroah-Hartman * some uarts on other side don't support no flow control. 2256ab4382d2SGreg Kroah-Hartman * So we set * DTR in host uart to make them happy 2257ab4382d2SGreg Kroah-Hartman */ 2258ab4382d2SGreg Kroah-Hartman port->mctrl |= TIOCM_DTR; 2259ab4382d2SGreg Kroah-Hartman 2260ab4382d2SGreg Kroah-Hartman port->ops->set_termios(port, &termios, &dummy); 2261ab4382d2SGreg Kroah-Hartman /* 2262ab4382d2SGreg Kroah-Hartman * Allow the setting of the UART parameters with a NULL console 2263ab4382d2SGreg Kroah-Hartman * too: 2264ab4382d2SGreg Kroah-Hartman */ 2265027b5717SPali Rohár if (co) { 2266ab4382d2SGreg Kroah-Hartman co->cflag = termios.c_cflag; 2267027b5717SPali Rohár co->ispeed = termios.c_ispeed; 2268027b5717SPali Rohár co->ospeed = termios.c_ospeed; 2269027b5717SPali Rohár } 2270ab4382d2SGreg Kroah-Hartman 2271ab4382d2SGreg Kroah-Hartman return 0; 2272ab4382d2SGreg Kroah-Hartman } 2273ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_set_options); 2274ab4382d2SGreg Kroah-Hartman #endif /* CONFIG_SERIAL_CORE_CONSOLE */ 2275ab4382d2SGreg Kroah-Hartman 2276cf75525fSJiri Slaby /** 2277cf75525fSJiri Slaby * uart_change_pm - set power state of the port 2278cf75525fSJiri Slaby * 2279cf75525fSJiri Slaby * @state: port descriptor 2280cf75525fSJiri Slaby * @pm_state: new state 2281cf75525fSJiri Slaby * 2282cf75525fSJiri Slaby * Locking: port->mutex has to be held 2283cf75525fSJiri Slaby */ 22846f538fe3SLinus Walleij static void uart_change_pm(struct uart_state *state, 22856f538fe3SLinus Walleij enum uart_pm_state pm_state) 2286ab4382d2SGreg Kroah-Hartman { 22874047b371SPeter Hurley struct uart_port *port = uart_port_check(state); 2288ab4382d2SGreg Kroah-Hartman 2289ab4382d2SGreg Kroah-Hartman if (state->pm_state != pm_state) { 22904047b371SPeter Hurley if (port && port->ops->pm) 2291ab4382d2SGreg Kroah-Hartman port->ops->pm(port, pm_state, state->pm_state); 2292ab4382d2SGreg Kroah-Hartman state->pm_state = pm_state; 2293ab4382d2SGreg Kroah-Hartman } 2294ab4382d2SGreg Kroah-Hartman } 2295ab4382d2SGreg Kroah-Hartman 2296ab4382d2SGreg Kroah-Hartman struct uart_match { 2297ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2298ab4382d2SGreg Kroah-Hartman struct uart_driver *driver; 2299ab4382d2SGreg Kroah-Hartman }; 2300ab4382d2SGreg Kroah-Hartman 2301ab4382d2SGreg Kroah-Hartman static int serial_match_port(struct device *dev, void *data) 2302ab4382d2SGreg Kroah-Hartman { 2303ab4382d2SGreg Kroah-Hartman struct uart_match *match = data; 2304ab4382d2SGreg Kroah-Hartman struct tty_driver *tty_drv = match->driver->tty_driver; 2305ab4382d2SGreg Kroah-Hartman dev_t devt = MKDEV(tty_drv->major, tty_drv->minor_start) + 2306ab4382d2SGreg Kroah-Hartman match->port->line; 2307ab4382d2SGreg Kroah-Hartman 2308ab4382d2SGreg Kroah-Hartman return dev->devt == devt; /* Actually, only one tty per port */ 2309ab4382d2SGreg Kroah-Hartman } 2310ab4382d2SGreg Kroah-Hartman 2311ab4382d2SGreg Kroah-Hartman int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport) 2312ab4382d2SGreg Kroah-Hartman { 2313ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 2314ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2315ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 2316ab4382d2SGreg Kroah-Hartman struct uart_match match = {uport, drv}; 2317ab4382d2SGreg Kroah-Hartman 2318ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2319ab4382d2SGreg Kroah-Hartman 2320ab4382d2SGreg Kroah-Hartman tty_dev = device_find_child(uport->dev, &match, serial_match_port); 232188e2582eSLucas Stach if (tty_dev && device_may_wakeup(tty_dev)) { 2322aef3ad10SAndy Shevchenko enable_irq_wake(uport->irq); 2323ab4382d2SGreg Kroah-Hartman put_device(tty_dev); 2324ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2325ab4382d2SGreg Kroah-Hartman return 0; 2326ab4382d2SGreg Kroah-Hartman } 23275a65dcc0SFederico Vaga put_device(tty_dev); 23285a65dcc0SFederico Vaga 2329c9d2325cSVijaya Krishna Nivarthi /* 2330c9d2325cSVijaya Krishna Nivarthi * Nothing to do if the console is not suspending 2331c9d2325cSVijaya Krishna Nivarthi * except stop_rx to prevent any asynchronous data 2332cfab87c2SVijaya Krishna Nivarthi * over RX line. However ensure that we will be 2333cfab87c2SVijaya Krishna Nivarthi * able to Re-start_rx later. 2334c9d2325cSVijaya Krishna Nivarthi */ 2335c9d2325cSVijaya Krishna Nivarthi if (!console_suspend_enabled && uart_console(uport)) { 2336cfab87c2SVijaya Krishna Nivarthi if (uport->ops->start_rx) 2337c9d2325cSVijaya Krishna Nivarthi uport->ops->stop_rx(uport); 2338b164c972SPeter Hurley goto unlock; 2339c9d2325cSVijaya Krishna Nivarthi } 2340b164c972SPeter Hurley 2341ab4382d2SGreg Kroah-Hartman uport->suspended = 1; 2342ab4382d2SGreg Kroah-Hartman 2343d41861caSPeter Hurley if (tty_port_initialized(port)) { 2344ab4382d2SGreg Kroah-Hartman const struct uart_ops *ops = uport->ops; 2345ab4382d2SGreg Kroah-Hartman int tries; 234618c9d4a3SAl Cooper unsigned int mctrl; 2347ab4382d2SGreg Kroah-Hartman 234875b20a2aSIlpo Järvinen tty_port_set_suspended(port, true); 2349515be7baSIlpo Järvinen tty_port_set_initialized(port, false); 2350ab4382d2SGreg Kroah-Hartman 2351ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 2352ab4382d2SGreg Kroah-Hartman ops->stop_tx(uport); 23537c7f9bc9SLukas Wunner if (!(uport->rs485.flags & SER_RS485_ENABLED)) 2354ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, 0); 235518c9d4a3SAl Cooper /* save mctrl so it can be restored on resume */ 235618c9d4a3SAl Cooper mctrl = uport->mctrl; 235718c9d4a3SAl Cooper uport->mctrl = 0; 2358ab4382d2SGreg Kroah-Hartman ops->stop_rx(uport); 2359ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2360ab4382d2SGreg Kroah-Hartman 2361ab4382d2SGreg Kroah-Hartman /* 2362ab4382d2SGreg Kroah-Hartman * Wait for the transmitter to empty. 2363ab4382d2SGreg Kroah-Hartman */ 2364ab4382d2SGreg Kroah-Hartman for (tries = 3; !ops->tx_empty(uport) && tries; tries--) 2365ab4382d2SGreg Kroah-Hartman msleep(10); 2366ab4382d2SGreg Kroah-Hartman if (!tries) 2367cade3580SAndy Shevchenko dev_err(uport->dev, "%s: Unable to drain transmitter\n", 2368cade3580SAndy Shevchenko uport->name); 2369ab4382d2SGreg Kroah-Hartman 2370ab4382d2SGreg Kroah-Hartman ops->shutdown(uport); 237118c9d4a3SAl Cooper uport->mctrl = mctrl; 2372ab4382d2SGreg Kroah-Hartman } 2373ab4382d2SGreg Kroah-Hartman 2374ab4382d2SGreg Kroah-Hartman /* 2375ab4382d2SGreg Kroah-Hartman * Disable the console device before suspending. 2376ab4382d2SGreg Kroah-Hartman */ 2377b164c972SPeter Hurley if (uart_console(uport)) 2378ab4382d2SGreg Kroah-Hartman console_stop(uport->cons); 2379ab4382d2SGreg Kroah-Hartman 23806f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_OFF); 2381b164c972SPeter Hurley unlock: 2382ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2383ab4382d2SGreg Kroah-Hartman 2384ab4382d2SGreg Kroah-Hartman return 0; 2385ab4382d2SGreg Kroah-Hartman } 238615dc475bSJiri Slaby EXPORT_SYMBOL(uart_suspend_port); 2387ab4382d2SGreg Kroah-Hartman 2388ab4382d2SGreg Kroah-Hartman int uart_resume_port(struct uart_driver *drv, struct uart_port *uport) 2389ab4382d2SGreg Kroah-Hartman { 2390ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 2391ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2392ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 2393ab4382d2SGreg Kroah-Hartman struct uart_match match = {uport, drv}; 2394ab4382d2SGreg Kroah-Hartman struct ktermios termios; 2395ab4382d2SGreg Kroah-Hartman 2396ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2397ab4382d2SGreg Kroah-Hartman 2398ab4382d2SGreg Kroah-Hartman tty_dev = device_find_child(uport->dev, &match, serial_match_port); 2399ab4382d2SGreg Kroah-Hartman if (!uport->suspended && device_may_wakeup(tty_dev)) { 2400aef3ad10SAndy Shevchenko if (irqd_is_wakeup_set(irq_get_irq_data((uport->irq)))) 2401ab4382d2SGreg Kroah-Hartman disable_irq_wake(uport->irq); 24025a65dcc0SFederico Vaga put_device(tty_dev); 2403ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2404ab4382d2SGreg Kroah-Hartman return 0; 2405ab4382d2SGreg Kroah-Hartman } 24065a65dcc0SFederico Vaga put_device(tty_dev); 2407ab4382d2SGreg Kroah-Hartman uport->suspended = 0; 2408ab4382d2SGreg Kroah-Hartman 2409ab4382d2SGreg Kroah-Hartman /* 2410ab4382d2SGreg Kroah-Hartman * Re-enable the console device after suspending. 2411ab4382d2SGreg Kroah-Hartman */ 24125933a161SYin Kangkai if (uart_console(uport)) { 2413ab4382d2SGreg Kroah-Hartman /* 2414ab4382d2SGreg Kroah-Hartman * First try to use the console cflag setting. 2415ab4382d2SGreg Kroah-Hartman */ 2416ab4382d2SGreg Kroah-Hartman memset(&termios, 0, sizeof(struct ktermios)); 2417ab4382d2SGreg Kroah-Hartman termios.c_cflag = uport->cons->cflag; 2418027b5717SPali Rohár termios.c_ispeed = uport->cons->ispeed; 2419027b5717SPali Rohár termios.c_ospeed = uport->cons->ospeed; 2420ab4382d2SGreg Kroah-Hartman 2421ab4382d2SGreg Kroah-Hartman /* 2422ab4382d2SGreg Kroah-Hartman * If that's unset, use the tty termios setting. 2423ab4382d2SGreg Kroah-Hartman */ 2424adc8d746SAlan Cox if (port->tty && termios.c_cflag == 0) 2425adc8d746SAlan Cox termios = port->tty->termios; 2426ab4382d2SGreg Kroah-Hartman 242794abc56fSNing Jiang if (console_suspend_enabled) 24286f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2429ab4382d2SGreg Kroah-Hartman uport->ops->set_termios(uport, &termios, NULL); 2430cfab87c2SVijaya Krishna Nivarthi if (!console_suspend_enabled && uport->ops->start_rx) 2431cfab87c2SVijaya Krishna Nivarthi uport->ops->start_rx(uport); 24325933a161SYin Kangkai if (console_suspend_enabled) 2433ab4382d2SGreg Kroah-Hartman console_start(uport->cons); 2434ab4382d2SGreg Kroah-Hartman } 2435ab4382d2SGreg Kroah-Hartman 243680f02d54SPeter Hurley if (tty_port_suspended(port)) { 2437ab4382d2SGreg Kroah-Hartman const struct uart_ops *ops = uport->ops; 2438ab4382d2SGreg Kroah-Hartman int ret; 2439ab4382d2SGreg Kroah-Hartman 24406f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2441ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 24427c7f9bc9SLukas Wunner if (!(uport->rs485.flags & SER_RS485_ENABLED)) 2443ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, 0); 2444ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2445ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) { 2446ab4382d2SGreg Kroah-Hartman /* Protected by port mutex for now */ 2447ab4382d2SGreg Kroah-Hartman struct tty_struct *tty = port->tty; 24484ed71addSTamseel Shams 2449ab4382d2SGreg Kroah-Hartman ret = ops->startup(uport); 2450ab4382d2SGreg Kroah-Hartman if (ret == 0) { 2451ab4382d2SGreg Kroah-Hartman if (tty) 2452826736a6SIlpo Järvinen uart_change_line_settings(tty, state, NULL); 2453ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 24547c7f9bc9SLukas Wunner if (!(uport->rs485.flags & SER_RS485_ENABLED)) 2455ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, uport->mctrl); 24567c7f9bc9SLukas Wunner else 24577c7f9bc9SLukas Wunner uart_rs485_config(uport); 2458ab4382d2SGreg Kroah-Hartman ops->start_tx(uport); 2459ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2460515be7baSIlpo Järvinen tty_port_set_initialized(port, true); 2461ab4382d2SGreg Kroah-Hartman } else { 2462ab4382d2SGreg Kroah-Hartman /* 2463ab4382d2SGreg Kroah-Hartman * Failed to resume - maybe hardware went away? 2464ab4382d2SGreg Kroah-Hartman * Clear the "initialized" flag so we won't try 2465ab4382d2SGreg Kroah-Hartman * to call the low level drivers shutdown method. 2466ab4382d2SGreg Kroah-Hartman */ 2467ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 2468ab4382d2SGreg Kroah-Hartman } 2469ab4382d2SGreg Kroah-Hartman } 2470ab4382d2SGreg Kroah-Hartman 247175b20a2aSIlpo Järvinen tty_port_set_suspended(port, false); 2472ab4382d2SGreg Kroah-Hartman } 2473ab4382d2SGreg Kroah-Hartman 2474ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2475ab4382d2SGreg Kroah-Hartman 2476ab4382d2SGreg Kroah-Hartman return 0; 2477ab4382d2SGreg Kroah-Hartman } 247815dc475bSJiri Slaby EXPORT_SYMBOL(uart_resume_port); 2479ab4382d2SGreg Kroah-Hartman 2480ab4382d2SGreg Kroah-Hartman static inline void 2481ab4382d2SGreg Kroah-Hartman uart_report_port(struct uart_driver *drv, struct uart_port *port) 2482ab4382d2SGreg Kroah-Hartman { 2483ab4382d2SGreg Kroah-Hartman char address[64]; 2484ab4382d2SGreg Kroah-Hartman 2485ab4382d2SGreg Kroah-Hartman switch (port->iotype) { 2486ab4382d2SGreg Kroah-Hartman case UPIO_PORT: 2487ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), "I/O 0x%lx", port->iobase); 2488ab4382d2SGreg Kroah-Hartman break; 2489ab4382d2SGreg Kroah-Hartman case UPIO_HUB6: 2490ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), 2491ab4382d2SGreg Kroah-Hartman "I/O 0x%lx offset 0x%x", port->iobase, port->hub6); 2492ab4382d2SGreg Kroah-Hartman break; 2493ab4382d2SGreg Kroah-Hartman case UPIO_MEM: 2494bd94c407SMasahiro Yamada case UPIO_MEM16: 2495ab4382d2SGreg Kroah-Hartman case UPIO_MEM32: 24963ffb1a81SKevin Cernekee case UPIO_MEM32BE: 2497ab4382d2SGreg Kroah-Hartman case UPIO_AU: 2498ab4382d2SGreg Kroah-Hartman case UPIO_TSI: 2499ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), 2500ab4382d2SGreg Kroah-Hartman "MMIO 0x%llx", (unsigned long long)port->mapbase); 2501ab4382d2SGreg Kroah-Hartman break; 2502ab4382d2SGreg Kroah-Hartman default: 2503eb9e109dSWolfram Sang strscpy(address, "*unknown*", sizeof(address)); 2504ab4382d2SGreg Kroah-Hartman break; 2505ab4382d2SGreg Kroah-Hartman } 2506ab4382d2SGreg Kroah-Hartman 2507cade3580SAndy Shevchenko pr_info("%s%s%s at %s (irq = %d, base_baud = %d) is a %s\n", 250868ed7e1cSJames Bottomley port->dev ? dev_name(port->dev) : "", 250968ed7e1cSJames Bottomley port->dev ? ": " : "", 2510cade3580SAndy Shevchenko port->name, 25117d12b976SKees Cook address, port->irq, port->uartclk / 16, uart_type(port)); 2512e7b91932SMaciej W. Rozycki 2513e7b91932SMaciej W. Rozycki /* The magic multiplier feature is a bit obscure, so report it too. */ 2514e7b91932SMaciej W. Rozycki if (port->flags & UPF_MAGIC_MULTIPLIER) 2515e7b91932SMaciej W. Rozycki pr_info("%s%s%s extra baud rates supported: %d, %d", 2516e7b91932SMaciej W. Rozycki port->dev ? dev_name(port->dev) : "", 2517e7b91932SMaciej W. Rozycki port->dev ? ": " : "", 2518e7b91932SMaciej W. Rozycki port->name, 2519e7b91932SMaciej W. Rozycki port->uartclk / 8, port->uartclk / 4); 2520ab4382d2SGreg Kroah-Hartman } 2521ab4382d2SGreg Kroah-Hartman 2522ab4382d2SGreg Kroah-Hartman static void 2523ab4382d2SGreg Kroah-Hartman uart_configure_port(struct uart_driver *drv, struct uart_state *state, 2524ab4382d2SGreg Kroah-Hartman struct uart_port *port) 2525ab4382d2SGreg Kroah-Hartman { 2526ab4382d2SGreg Kroah-Hartman unsigned int flags; 2527ab4382d2SGreg Kroah-Hartman 2528ab4382d2SGreg Kroah-Hartman /* 2529ab4382d2SGreg Kroah-Hartman * If there isn't a port here, don't do anything further. 2530ab4382d2SGreg Kroah-Hartman */ 2531ab4382d2SGreg Kroah-Hartman if (!port->iobase && !port->mapbase && !port->membase) 2532ab4382d2SGreg Kroah-Hartman return; 2533ab4382d2SGreg Kroah-Hartman 2534ab4382d2SGreg Kroah-Hartman /* 2535ab4382d2SGreg Kroah-Hartman * Now do the auto configuration stuff. Note that config_port 2536ab4382d2SGreg Kroah-Hartman * is expected to claim the resources and map the port for us. 2537ab4382d2SGreg Kroah-Hartman */ 2538ab4382d2SGreg Kroah-Hartman flags = 0; 2539ab4382d2SGreg Kroah-Hartman if (port->flags & UPF_AUTO_IRQ) 2540ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_IRQ; 2541ab4382d2SGreg Kroah-Hartman if (port->flags & UPF_BOOT_AUTOCONF) { 2542ab4382d2SGreg Kroah-Hartman if (!(port->flags & UPF_FIXED_TYPE)) { 2543ab4382d2SGreg Kroah-Hartman port->type = PORT_UNKNOWN; 2544ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_TYPE; 2545ab4382d2SGreg Kroah-Hartman } 2546ab4382d2SGreg Kroah-Hartman port->ops->config_port(port, flags); 2547ab4382d2SGreg Kroah-Hartman } 2548ab4382d2SGreg Kroah-Hartman 2549ab4382d2SGreg Kroah-Hartman if (port->type != PORT_UNKNOWN) { 2550ab4382d2SGreg Kroah-Hartman unsigned long flags; 2551ab4382d2SGreg Kroah-Hartman 2552ab4382d2SGreg Kroah-Hartman uart_report_port(drv, port); 2553ab4382d2SGreg Kroah-Hartman 2554ab4382d2SGreg Kroah-Hartman /* Power up port for set_mctrl() */ 25556f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2556ab4382d2SGreg Kroah-Hartman 2557ab4382d2SGreg Kroah-Hartman /* 2558ab4382d2SGreg Kroah-Hartman * Ensure that the modem control lines are de-activated. 2559ab4382d2SGreg Kroah-Hartman * keep the DTR setting that is set in uart_set_options() 2560ab4382d2SGreg Kroah-Hartman * We probably don't need a spinlock around this, but 2561ab4382d2SGreg Kroah-Hartman */ 2562ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 256393a770b7SLukas Wunner port->mctrl &= TIOCM_DTR; 25647c7f9bc9SLukas Wunner if (!(port->rs485.flags & SER_RS485_ENABLED)) 256593a770b7SLukas Wunner port->ops->set_mctrl(port, port->mctrl); 25667c7f9bc9SLukas Wunner else 25677c7f9bc9SLukas Wunner uart_rs485_config(port); 2568ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 2569ab4382d2SGreg Kroah-Hartman 2570ab4382d2SGreg Kroah-Hartman /* 2571ab4382d2SGreg Kroah-Hartman * If this driver supports console, and it hasn't been 2572ab4382d2SGreg Kroah-Hartman * successfully registered yet, try to re-register it. 2573ab4382d2SGreg Kroah-Hartman * It may be that the port was not available. 2574ab4382d2SGreg Kroah-Hartman */ 2575452b9b24SJohn Ogness if (port->cons && !console_is_registered(port->cons)) 2576ab4382d2SGreg Kroah-Hartman register_console(port->cons); 2577ab4382d2SGreg Kroah-Hartman 2578ab4382d2SGreg Kroah-Hartman /* 2579ab4382d2SGreg Kroah-Hartman * Power down all ports by default, except the 2580ab4382d2SGreg Kroah-Hartman * console if we have one. 2581ab4382d2SGreg Kroah-Hartman */ 2582ab4382d2SGreg Kroah-Hartman if (!uart_console(port)) 25836f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_OFF); 2584ab4382d2SGreg Kroah-Hartman } 2585ab4382d2SGreg Kroah-Hartman } 2586ab4382d2SGreg Kroah-Hartman 2587ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 2588ab4382d2SGreg Kroah-Hartman 2589ab4382d2SGreg Kroah-Hartman static int uart_poll_init(struct tty_driver *driver, int line, char *options) 2590ab4382d2SGreg Kroah-Hartman { 2591ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2592ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2593*5e227ef2SDouglas Anderson enum uart_pm_state pm_state; 259449c02304SPeter Hurley struct tty_port *tport; 2595ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2596ab4382d2SGreg Kroah-Hartman int baud = 9600; 2597ab4382d2SGreg Kroah-Hartman int bits = 8; 2598ab4382d2SGreg Kroah-Hartman int parity = 'n'; 2599ab4382d2SGreg Kroah-Hartman int flow = 'n'; 260049c02304SPeter Hurley int ret = 0; 2601ab4382d2SGreg Kroah-Hartman 260249c02304SPeter Hurley tport = &state->port; 260349c02304SPeter Hurley mutex_lock(&tport->mutex); 260449c02304SPeter Hurley 26054047b371SPeter Hurley port = uart_port_check(state); 26064047b371SPeter Hurley if (!port || !(port->ops->poll_get_char && port->ops->poll_put_char)) { 260749c02304SPeter Hurley ret = -1; 260849c02304SPeter Hurley goto out; 260949c02304SPeter Hurley } 2610ab4382d2SGreg Kroah-Hartman 2611*5e227ef2SDouglas Anderson pm_state = state->pm_state; 2612*5e227ef2SDouglas Anderson uart_change_pm(state, UART_PM_STATE_ON); 2613*5e227ef2SDouglas Anderson 2614c7f3e708SAnton Vorontsov if (port->ops->poll_init) { 2615c7f3e708SAnton Vorontsov /* 2616d41861caSPeter Hurley * We don't set initialized as we only initialized the hw, 2617d41861caSPeter Hurley * e.g. state->xmit is still uninitialized. 2618c7f3e708SAnton Vorontsov */ 2619d41861caSPeter Hurley if (!tty_port_initialized(tport)) 2620c7f3e708SAnton Vorontsov ret = port->ops->poll_init(port); 2621c7f3e708SAnton Vorontsov } 2622c7f3e708SAnton Vorontsov 262349c02304SPeter Hurley if (!ret && options) { 2624ab4382d2SGreg Kroah-Hartman uart_parse_options(options, &baud, &parity, &bits, &flow); 26253ef5abd9SJohn Ogness console_list_lock(); 262649c02304SPeter Hurley ret = uart_set_options(port, NULL, baud, parity, bits, flow); 26273ef5abd9SJohn Ogness console_list_unlock(); 2628ab4382d2SGreg Kroah-Hartman } 262949c02304SPeter Hurley out: 2630*5e227ef2SDouglas Anderson if (ret) 2631*5e227ef2SDouglas Anderson uart_change_pm(state, pm_state); 263249c02304SPeter Hurley mutex_unlock(&tport->mutex); 263349c02304SPeter Hurley return ret; 2634ab4382d2SGreg Kroah-Hartman } 2635ab4382d2SGreg Kroah-Hartman 2636ab4382d2SGreg Kroah-Hartman static int uart_poll_get_char(struct tty_driver *driver, int line) 2637ab4382d2SGreg Kroah-Hartman { 2638ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2639ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2640ab4382d2SGreg Kroah-Hartman struct uart_port *port; 26419ed19428SPeter Hurley int ret = -1; 2642ab4382d2SGreg Kroah-Hartman 26439ed19428SPeter Hurley port = uart_port_ref(state); 2644ef510beaSAndy Shevchenko if (port) { 26459ed19428SPeter Hurley ret = port->ops->poll_get_char(port); 26469ed19428SPeter Hurley uart_port_deref(port); 26479ed19428SPeter Hurley } 264822077b09SJiri Slaby 26499ed19428SPeter Hurley return ret; 2650ab4382d2SGreg Kroah-Hartman } 2651ab4382d2SGreg Kroah-Hartman 2652ab4382d2SGreg Kroah-Hartman static void uart_poll_put_char(struct tty_driver *driver, int line, char ch) 2653ab4382d2SGreg Kroah-Hartman { 2654ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2655ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2656ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2657ab4382d2SGreg Kroah-Hartman 26589ed19428SPeter Hurley port = uart_port_ref(state); 26599ed19428SPeter Hurley if (!port) 26609ed19428SPeter Hurley return; 2661c7d44a02SDoug Anderson 2662c7d44a02SDoug Anderson if (ch == '\n') 2663c7d44a02SDoug Anderson port->ops->poll_put_char(port, '\r'); 2664ab4382d2SGreg Kroah-Hartman port->ops->poll_put_char(port, ch); 26659ed19428SPeter Hurley uart_port_deref(port); 2666ab4382d2SGreg Kroah-Hartman } 2667ab4382d2SGreg Kroah-Hartman #endif 2668ab4382d2SGreg Kroah-Hartman 2669ab4382d2SGreg Kroah-Hartman static const struct tty_operations uart_ops = { 26704cdd17baSJiri Slaby .install = uart_install, 2671ab4382d2SGreg Kroah-Hartman .open = uart_open, 2672ab4382d2SGreg Kroah-Hartman .close = uart_close, 2673ab4382d2SGreg Kroah-Hartman .write = uart_write, 2674ab4382d2SGreg Kroah-Hartman .put_char = uart_put_char, 2675ab4382d2SGreg Kroah-Hartman .flush_chars = uart_flush_chars, 2676ab4382d2SGreg Kroah-Hartman .write_room = uart_write_room, 2677ab4382d2SGreg Kroah-Hartman .chars_in_buffer= uart_chars_in_buffer, 2678ab4382d2SGreg Kroah-Hartman .flush_buffer = uart_flush_buffer, 2679ab4382d2SGreg Kroah-Hartman .ioctl = uart_ioctl, 2680ab4382d2SGreg Kroah-Hartman .throttle = uart_throttle, 2681ab4382d2SGreg Kroah-Hartman .unthrottle = uart_unthrottle, 2682ab4382d2SGreg Kroah-Hartman .send_xchar = uart_send_xchar, 2683ab4382d2SGreg Kroah-Hartman .set_termios = uart_set_termios, 2684ab4382d2SGreg Kroah-Hartman .set_ldisc = uart_set_ldisc, 2685ab4382d2SGreg Kroah-Hartman .stop = uart_stop, 2686ab4382d2SGreg Kroah-Hartman .start = uart_start, 2687ab4382d2SGreg Kroah-Hartman .hangup = uart_hangup, 2688ab4382d2SGreg Kroah-Hartman .break_ctl = uart_break_ctl, 2689ab4382d2SGreg Kroah-Hartman .wait_until_sent= uart_wait_until_sent, 2690ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_PROC_FS 26918a8dcabfSChristoph Hellwig .proc_show = uart_proc_show, 2692ab4382d2SGreg Kroah-Hartman #endif 2693ab4382d2SGreg Kroah-Hartman .tiocmget = uart_tiocmget, 2694ab4382d2SGreg Kroah-Hartman .tiocmset = uart_tiocmset, 26955099d234SAl Viro .set_serial = uart_set_info_user, 26965099d234SAl Viro .get_serial = uart_get_info_user, 2697ab4382d2SGreg Kroah-Hartman .get_icount = uart_get_icount, 2698ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 2699ab4382d2SGreg Kroah-Hartman .poll_init = uart_poll_init, 2700ab4382d2SGreg Kroah-Hartman .poll_get_char = uart_poll_get_char, 2701ab4382d2SGreg Kroah-Hartman .poll_put_char = uart_poll_put_char, 2702ab4382d2SGreg Kroah-Hartman #endif 2703ab4382d2SGreg Kroah-Hartman }; 2704ab4382d2SGreg Kroah-Hartman 2705ab4382d2SGreg Kroah-Hartman static const struct tty_port_operations uart_port_ops = { 2706ab4382d2SGreg Kroah-Hartman .carrier_raised = uart_carrier_raised, 2707ab4382d2SGreg Kroah-Hartman .dtr_rts = uart_dtr_rts, 2708b3b57646SRob Herring .activate = uart_port_activate, 2709761ed4a9SRob Herring .shutdown = uart_tty_port_shutdown, 2710ab4382d2SGreg Kroah-Hartman }; 2711ab4382d2SGreg Kroah-Hartman 2712ab4382d2SGreg Kroah-Hartman /** 2713ab4382d2SGreg Kroah-Hartman * uart_register_driver - register a driver with the uart core layer 2714ab4382d2SGreg Kroah-Hartman * @drv: low level driver structure 2715ab4382d2SGreg Kroah-Hartman * 2716c4bd17a6SJiri Slaby * Register a uart driver with the core driver. We in turn register with the 2717c4bd17a6SJiri Slaby * tty layer, and initialise the core driver per-port state. 2718ab4382d2SGreg Kroah-Hartman * 2719c4bd17a6SJiri Slaby * We have a proc file in /proc/tty/driver which is named after the normal 2720c4bd17a6SJiri Slaby * driver. 2721ab4382d2SGreg Kroah-Hartman * 2722c4bd17a6SJiri Slaby * @drv->port should be %NULL, and the per-port structures should be registered 2723c4bd17a6SJiri Slaby * using uart_add_one_port() after this call has succeeded. 2724c4bd17a6SJiri Slaby * 2725c4bd17a6SJiri Slaby * Locking: none, Interrupts: enabled 2726ab4382d2SGreg Kroah-Hartman */ 2727ab4382d2SGreg Kroah-Hartman int uart_register_driver(struct uart_driver *drv) 2728ab4382d2SGreg Kroah-Hartman { 2729ab4382d2SGreg Kroah-Hartman struct tty_driver *normal; 2730050dfc09SSergey Organov int i, retval = -ENOMEM; 2731ab4382d2SGreg Kroah-Hartman 2732ab4382d2SGreg Kroah-Hartman BUG_ON(drv->state); 2733ab4382d2SGreg Kroah-Hartman 2734ab4382d2SGreg Kroah-Hartman /* 2735ab4382d2SGreg Kroah-Hartman * Maybe we should be using a slab cache for this, especially if 2736ab4382d2SGreg Kroah-Hartman * we have a large number of ports to handle. 2737ab4382d2SGreg Kroah-Hartman */ 27386396bb22SKees Cook drv->state = kcalloc(drv->nr, sizeof(struct uart_state), GFP_KERNEL); 2739ab4382d2SGreg Kroah-Hartman if (!drv->state) 2740ab4382d2SGreg Kroah-Hartman goto out; 2741ab4382d2SGreg Kroah-Hartman 274239b7b42bSJiri Slaby normal = tty_alloc_driver(drv->nr, TTY_DRIVER_REAL_RAW | 274339b7b42bSJiri Slaby TTY_DRIVER_DYNAMIC_DEV); 274439b7b42bSJiri Slaby if (IS_ERR(normal)) { 274539b7b42bSJiri Slaby retval = PTR_ERR(normal); 2746ab4382d2SGreg Kroah-Hartman goto out_kfree; 274739b7b42bSJiri Slaby } 2748ab4382d2SGreg Kroah-Hartman 2749ab4382d2SGreg Kroah-Hartman drv->tty_driver = normal; 2750ab4382d2SGreg Kroah-Hartman 2751ab4382d2SGreg Kroah-Hartman normal->driver_name = drv->driver_name; 2752ab4382d2SGreg Kroah-Hartman normal->name = drv->dev_name; 2753ab4382d2SGreg Kroah-Hartman normal->major = drv->major; 2754ab4382d2SGreg Kroah-Hartman normal->minor_start = drv->minor; 2755ab4382d2SGreg Kroah-Hartman normal->type = TTY_DRIVER_TYPE_SERIAL; 2756ab4382d2SGreg Kroah-Hartman normal->subtype = SERIAL_TYPE_NORMAL; 2757ab4382d2SGreg Kroah-Hartman normal->init_termios = tty_std_termios; 2758ab4382d2SGreg Kroah-Hartman normal->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; 2759ab4382d2SGreg Kroah-Hartman normal->init_termios.c_ispeed = normal->init_termios.c_ospeed = 9600; 2760ab4382d2SGreg Kroah-Hartman normal->driver_state = drv; 2761ab4382d2SGreg Kroah-Hartman tty_set_operations(normal, &uart_ops); 2762ab4382d2SGreg Kroah-Hartman 2763ab4382d2SGreg Kroah-Hartman /* 2764ab4382d2SGreg Kroah-Hartman * Initialise the UART state(s). 2765ab4382d2SGreg Kroah-Hartman */ 2766ab4382d2SGreg Kroah-Hartman for (i = 0; i < drv->nr; i++) { 2767ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + i; 2768ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2769ab4382d2SGreg Kroah-Hartman 2770ab4382d2SGreg Kroah-Hartman tty_port_init(port); 2771ab4382d2SGreg Kroah-Hartman port->ops = &uart_port_ops; 2772ab4382d2SGreg Kroah-Hartman } 2773ab4382d2SGreg Kroah-Hartman 2774ab4382d2SGreg Kroah-Hartman retval = tty_register_driver(normal); 2775ab4382d2SGreg Kroah-Hartman if (retval >= 0) 2776ab4382d2SGreg Kroah-Hartman return retval; 2777ab4382d2SGreg Kroah-Hartman 2778191c5f10SJiri Slaby for (i = 0; i < drv->nr; i++) 2779191c5f10SJiri Slaby tty_port_destroy(&drv->state[i].port); 27809f90a4ddSJiri Slaby tty_driver_kref_put(normal); 2781ab4382d2SGreg Kroah-Hartman out_kfree: 2782ab4382d2SGreg Kroah-Hartman kfree(drv->state); 2783ab4382d2SGreg Kroah-Hartman out: 2784050dfc09SSergey Organov return retval; 2785ab4382d2SGreg Kroah-Hartman } 278615dc475bSJiri Slaby EXPORT_SYMBOL(uart_register_driver); 2787ab4382d2SGreg Kroah-Hartman 2788ab4382d2SGreg Kroah-Hartman /** 2789ab4382d2SGreg Kroah-Hartman * uart_unregister_driver - remove a driver from the uart core layer 2790ab4382d2SGreg Kroah-Hartman * @drv: low level driver structure 2791ab4382d2SGreg Kroah-Hartman * 2792c4bd17a6SJiri Slaby * Remove all references to a driver from the core driver. The low level 2793c4bd17a6SJiri Slaby * driver must have removed all its ports via the uart_remove_one_port() if it 2794c4bd17a6SJiri Slaby * registered them with uart_add_one_port(). (I.e. @drv->port is %NULL.) 2795c4bd17a6SJiri Slaby * 2796c4bd17a6SJiri Slaby * Locking: none, Interrupts: enabled 2797ab4382d2SGreg Kroah-Hartman */ 2798ab4382d2SGreg Kroah-Hartman void uart_unregister_driver(struct uart_driver *drv) 2799ab4382d2SGreg Kroah-Hartman { 2800ab4382d2SGreg Kroah-Hartman struct tty_driver *p = drv->tty_driver; 2801191c5f10SJiri Slaby unsigned int i; 2802191c5f10SJiri Slaby 2803ab4382d2SGreg Kroah-Hartman tty_unregister_driver(p); 28049f90a4ddSJiri Slaby tty_driver_kref_put(p); 2805191c5f10SJiri Slaby for (i = 0; i < drv->nr; i++) 2806191c5f10SJiri Slaby tty_port_destroy(&drv->state[i].port); 2807ab4382d2SGreg Kroah-Hartman kfree(drv->state); 28081e66cdedSAlan Cox drv->state = NULL; 2809ab4382d2SGreg Kroah-Hartman drv->tty_driver = NULL; 2810ab4382d2SGreg Kroah-Hartman } 281115dc475bSJiri Slaby EXPORT_SYMBOL(uart_unregister_driver); 2812ab4382d2SGreg Kroah-Hartman 2813ab4382d2SGreg Kroah-Hartman struct tty_driver *uart_console_device(struct console *co, int *index) 2814ab4382d2SGreg Kroah-Hartman { 2815ab4382d2SGreg Kroah-Hartman struct uart_driver *p = co->data; 2816ab4382d2SGreg Kroah-Hartman *index = co->index; 2817ab4382d2SGreg Kroah-Hartman return p->tty_driver; 2818ab4382d2SGreg Kroah-Hartman } 2819488f49acSJohn Stultz EXPORT_SYMBOL_GPL(uart_console_device); 2820ab4382d2SGreg Kroah-Hartman 2821143c02c8SAndy Shevchenko static ssize_t uartclk_show(struct device *dev, 28226915c0e4STomas Hlavacek struct device_attribute *attr, char *buf) 28236915c0e4STomas Hlavacek { 2824bebe73e3SAlan Cox struct serial_struct tmp; 28256915c0e4STomas Hlavacek struct tty_port *port = dev_get_drvdata(dev); 2826b1b79916STomas Hlavacek 28279f109694SAlan Cox uart_get_info(port, &tmp); 28289cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.baud_base * 16); 28296915c0e4STomas Hlavacek } 28306915c0e4STomas Hlavacek 2831143c02c8SAndy Shevchenko static ssize_t type_show(struct device *dev, 2832373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2833373bac4cSAlan Cox { 2834373bac4cSAlan Cox struct serial_struct tmp; 2835373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2836373bac4cSAlan Cox 2837373bac4cSAlan Cox uart_get_info(port, &tmp); 28389cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.type); 2839373bac4cSAlan Cox } 2840143c02c8SAndy Shevchenko 2841143c02c8SAndy Shevchenko static ssize_t line_show(struct device *dev, 2842373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2843373bac4cSAlan Cox { 2844373bac4cSAlan Cox struct serial_struct tmp; 2845373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2846373bac4cSAlan Cox 2847373bac4cSAlan Cox uart_get_info(port, &tmp); 28489cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.line); 2849373bac4cSAlan Cox } 2850373bac4cSAlan Cox 2851143c02c8SAndy Shevchenko static ssize_t port_show(struct device *dev, 2852373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2853373bac4cSAlan Cox { 2854373bac4cSAlan Cox struct serial_struct tmp; 2855373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2856fd985e1dSAndrew Morton unsigned long ioaddr; 2857373bac4cSAlan Cox 2858373bac4cSAlan Cox uart_get_info(port, &tmp); 2859fd985e1dSAndrew Morton ioaddr = tmp.port; 2860fd985e1dSAndrew Morton if (HIGH_BITS_OFFSET) 2861fd985e1dSAndrew Morton ioaddr |= (unsigned long)tmp.port_high << HIGH_BITS_OFFSET; 28629cfbf7a6SAlex Dewar return sprintf(buf, "0x%lX\n", ioaddr); 2863373bac4cSAlan Cox } 2864373bac4cSAlan Cox 2865143c02c8SAndy Shevchenko static ssize_t irq_show(struct device *dev, 2866373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2867373bac4cSAlan Cox { 2868373bac4cSAlan Cox struct serial_struct tmp; 2869373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2870373bac4cSAlan Cox 2871373bac4cSAlan Cox uart_get_info(port, &tmp); 28729cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.irq); 2873373bac4cSAlan Cox } 2874373bac4cSAlan Cox 2875143c02c8SAndy Shevchenko static ssize_t flags_show(struct device *dev, 2876373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2877373bac4cSAlan Cox { 2878373bac4cSAlan Cox struct serial_struct tmp; 2879373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2880373bac4cSAlan Cox 2881373bac4cSAlan Cox uart_get_info(port, &tmp); 28829cfbf7a6SAlex Dewar return sprintf(buf, "0x%X\n", tmp.flags); 2883373bac4cSAlan Cox } 2884373bac4cSAlan Cox 2885143c02c8SAndy Shevchenko static ssize_t xmit_fifo_size_show(struct device *dev, 2886373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2887373bac4cSAlan Cox { 2888373bac4cSAlan Cox struct serial_struct tmp; 2889373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2890373bac4cSAlan Cox 2891373bac4cSAlan Cox uart_get_info(port, &tmp); 28929cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.xmit_fifo_size); 2893373bac4cSAlan Cox } 2894373bac4cSAlan Cox 2895143c02c8SAndy Shevchenko static ssize_t close_delay_show(struct device *dev, 2896373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2897373bac4cSAlan Cox { 2898373bac4cSAlan Cox struct serial_struct tmp; 2899373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2900373bac4cSAlan Cox 2901373bac4cSAlan Cox uart_get_info(port, &tmp); 29029cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.close_delay); 2903373bac4cSAlan Cox } 2904373bac4cSAlan Cox 2905143c02c8SAndy Shevchenko static ssize_t closing_wait_show(struct device *dev, 2906373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2907373bac4cSAlan Cox { 2908373bac4cSAlan Cox struct serial_struct tmp; 2909373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2910373bac4cSAlan Cox 2911373bac4cSAlan Cox uart_get_info(port, &tmp); 29129cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.closing_wait); 2913373bac4cSAlan Cox } 2914373bac4cSAlan Cox 2915143c02c8SAndy Shevchenko static ssize_t custom_divisor_show(struct device *dev, 2916373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2917373bac4cSAlan Cox { 2918373bac4cSAlan Cox struct serial_struct tmp; 2919373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2920373bac4cSAlan Cox 2921373bac4cSAlan Cox uart_get_info(port, &tmp); 29229cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.custom_divisor); 2923373bac4cSAlan Cox } 2924373bac4cSAlan Cox 2925143c02c8SAndy Shevchenko static ssize_t io_type_show(struct device *dev, 2926373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2927373bac4cSAlan Cox { 2928373bac4cSAlan Cox struct serial_struct tmp; 2929373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2930373bac4cSAlan Cox 2931373bac4cSAlan Cox uart_get_info(port, &tmp); 29329cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.io_type); 2933373bac4cSAlan Cox } 2934373bac4cSAlan Cox 2935143c02c8SAndy Shevchenko static ssize_t iomem_base_show(struct device *dev, 2936373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2937373bac4cSAlan Cox { 2938373bac4cSAlan Cox struct serial_struct tmp; 2939373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2940373bac4cSAlan Cox 2941373bac4cSAlan Cox uart_get_info(port, &tmp); 29429cfbf7a6SAlex Dewar return sprintf(buf, "0x%lX\n", (unsigned long)tmp.iomem_base); 2943373bac4cSAlan Cox } 2944373bac4cSAlan Cox 2945143c02c8SAndy Shevchenko static ssize_t iomem_reg_shift_show(struct device *dev, 2946373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2947373bac4cSAlan Cox { 2948373bac4cSAlan Cox struct serial_struct tmp; 2949373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2950373bac4cSAlan Cox 2951373bac4cSAlan Cox uart_get_info(port, &tmp); 29529cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.iomem_reg_shift); 2953373bac4cSAlan Cox } 2954373bac4cSAlan Cox 2955a3cb39d2SAndy Shevchenko static ssize_t console_show(struct device *dev, 2956a3cb39d2SAndy Shevchenko struct device_attribute *attr, char *buf) 2957a3cb39d2SAndy Shevchenko { 2958a3cb39d2SAndy Shevchenko struct tty_port *port = dev_get_drvdata(dev); 2959a3cb39d2SAndy Shevchenko struct uart_state *state = container_of(port, struct uart_state, port); 2960a3cb39d2SAndy Shevchenko struct uart_port *uport; 2961a3cb39d2SAndy Shevchenko bool console = false; 2962a3cb39d2SAndy Shevchenko 2963a3cb39d2SAndy Shevchenko mutex_lock(&port->mutex); 2964a3cb39d2SAndy Shevchenko uport = uart_port_check(state); 2965a3cb39d2SAndy Shevchenko if (uport) 2966452b9b24SJohn Ogness console = uart_console_registered(uport); 2967a3cb39d2SAndy Shevchenko mutex_unlock(&port->mutex); 2968a3cb39d2SAndy Shevchenko 2969a3cb39d2SAndy Shevchenko return sprintf(buf, "%c\n", console ? 'Y' : 'N'); 2970a3cb39d2SAndy Shevchenko } 2971a3cb39d2SAndy Shevchenko 2972a3cb39d2SAndy Shevchenko static ssize_t console_store(struct device *dev, 2973a3cb39d2SAndy Shevchenko struct device_attribute *attr, const char *buf, size_t count) 2974a3cb39d2SAndy Shevchenko { 2975a3cb39d2SAndy Shevchenko struct tty_port *port = dev_get_drvdata(dev); 2976a3cb39d2SAndy Shevchenko struct uart_state *state = container_of(port, struct uart_state, port); 2977a3cb39d2SAndy Shevchenko struct uart_port *uport; 2978a3cb39d2SAndy Shevchenko bool oldconsole, newconsole; 2979a3cb39d2SAndy Shevchenko int ret; 2980a3cb39d2SAndy Shevchenko 2981a3cb39d2SAndy Shevchenko ret = kstrtobool(buf, &newconsole); 2982a3cb39d2SAndy Shevchenko if (ret) 2983a3cb39d2SAndy Shevchenko return ret; 2984a3cb39d2SAndy Shevchenko 2985a3cb39d2SAndy Shevchenko mutex_lock(&port->mutex); 2986a3cb39d2SAndy Shevchenko uport = uart_port_check(state); 2987a3cb39d2SAndy Shevchenko if (uport) { 2988452b9b24SJohn Ogness oldconsole = uart_console_registered(uport); 2989a3cb39d2SAndy Shevchenko if (oldconsole && !newconsole) { 2990a3cb39d2SAndy Shevchenko ret = unregister_console(uport->cons); 2991a3cb39d2SAndy Shevchenko } else if (!oldconsole && newconsole) { 2992e0830dbfSJohan Hovold if (uart_console(uport)) { 2993e0830dbfSJohan Hovold uport->console_reinit = 1; 2994a3cb39d2SAndy Shevchenko register_console(uport->cons); 2995e0830dbfSJohan Hovold } else { 2996a3cb39d2SAndy Shevchenko ret = -ENOENT; 2997a3cb39d2SAndy Shevchenko } 2998e0830dbfSJohan Hovold } 2999a3cb39d2SAndy Shevchenko } else { 3000a3cb39d2SAndy Shevchenko ret = -ENXIO; 3001a3cb39d2SAndy Shevchenko } 3002a3cb39d2SAndy Shevchenko mutex_unlock(&port->mutex); 3003a3cb39d2SAndy Shevchenko 3004a3cb39d2SAndy Shevchenko return ret < 0 ? ret : count; 3005a3cb39d2SAndy Shevchenko } 3006a3cb39d2SAndy Shevchenko 3007143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(uartclk); 3008143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(type); 3009143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(line); 3010143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(port); 3011143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(irq); 3012143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(flags); 3013143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(xmit_fifo_size); 3014143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(close_delay); 3015143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(closing_wait); 3016143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(custom_divisor); 3017143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(io_type); 3018143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(iomem_base); 3019143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(iomem_reg_shift); 3020a3cb39d2SAndy Shevchenko static DEVICE_ATTR_RW(console); 30216915c0e4STomas Hlavacek 30226915c0e4STomas Hlavacek static struct attribute *tty_dev_attrs[] = { 3023143c02c8SAndy Shevchenko &dev_attr_uartclk.attr, 3024373bac4cSAlan Cox &dev_attr_type.attr, 3025373bac4cSAlan Cox &dev_attr_line.attr, 3026373bac4cSAlan Cox &dev_attr_port.attr, 3027373bac4cSAlan Cox &dev_attr_irq.attr, 3028373bac4cSAlan Cox &dev_attr_flags.attr, 3029373bac4cSAlan Cox &dev_attr_xmit_fifo_size.attr, 3030373bac4cSAlan Cox &dev_attr_close_delay.attr, 3031373bac4cSAlan Cox &dev_attr_closing_wait.attr, 3032373bac4cSAlan Cox &dev_attr_custom_divisor.attr, 3033373bac4cSAlan Cox &dev_attr_io_type.attr, 3034373bac4cSAlan Cox &dev_attr_iomem_base.attr, 3035373bac4cSAlan Cox &dev_attr_iomem_reg_shift.attr, 3036a3cb39d2SAndy Shevchenko &dev_attr_console.attr, 3037a3cb39d2SAndy Shevchenko NULL 30386915c0e4STomas Hlavacek }; 30396915c0e4STomas Hlavacek 3040b1b79916STomas Hlavacek static const struct attribute_group tty_dev_attr_group = { 30416915c0e4STomas Hlavacek .attrs = tty_dev_attrs, 30426915c0e4STomas Hlavacek }; 30436915c0e4STomas Hlavacek 3044ab4382d2SGreg Kroah-Hartman /** 3045ab4382d2SGreg Kroah-Hartman * uart_add_one_port - attach a driver-defined port structure 3046ab4382d2SGreg Kroah-Hartman * @drv: pointer to the uart low level driver structure for this port 3047ab4382d2SGreg Kroah-Hartman * @uport: uart port structure to use for this port. 3048ab4382d2SGreg Kroah-Hartman * 3049a157270fSAhmed S. Darwish * Context: task context, might sleep 3050a157270fSAhmed S. Darwish * 3051c4bd17a6SJiri Slaby * This allows the driver @drv to register its own uart_port structure with the 3052c4bd17a6SJiri Slaby * core driver. The main purpose is to allow the low level uart drivers to 3053c4bd17a6SJiri Slaby * expand uart_port, rather than having yet more levels of structures. 3054ab4382d2SGreg Kroah-Hartman */ 3055ab4382d2SGreg Kroah-Hartman int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport) 3056ab4382d2SGreg Kroah-Hartman { 3057ab4382d2SGreg Kroah-Hartman struct uart_state *state; 3058ab4382d2SGreg Kroah-Hartman struct tty_port *port; 3059ab4382d2SGreg Kroah-Hartman int ret = 0; 3060ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 3061266dcff0SGreg Kroah-Hartman int num_groups; 3062ab4382d2SGreg Kroah-Hartman 3063ab4382d2SGreg Kroah-Hartman if (uport->line >= drv->nr) 3064ab4382d2SGreg Kroah-Hartman return -EINVAL; 3065ab4382d2SGreg Kroah-Hartman 3066ab4382d2SGreg Kroah-Hartman state = drv->state + uport->line; 3067ab4382d2SGreg Kroah-Hartman port = &state->port; 3068ab4382d2SGreg Kroah-Hartman 3069ab4382d2SGreg Kroah-Hartman mutex_lock(&port_mutex); 3070ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 3071ab4382d2SGreg Kroah-Hartman if (state->uart_port) { 3072ab4382d2SGreg Kroah-Hartman ret = -EINVAL; 3073ab4382d2SGreg Kroah-Hartman goto out; 3074ab4382d2SGreg Kroah-Hartman } 3075ab4382d2SGreg Kroah-Hartman 30762b702b9bSPeter Hurley /* Link the port to the driver state table and vice versa */ 30779ed19428SPeter Hurley atomic_set(&state->refcount, 1); 30789ed19428SPeter Hurley init_waitqueue_head(&state->remove_wait); 3079ab4382d2SGreg Kroah-Hartman state->uart_port = uport; 3080ab4382d2SGreg Kroah-Hartman uport->state = state; 3081ab4382d2SGreg Kroah-Hartman 30822b702b9bSPeter Hurley state->pm_state = UART_PM_STATE_UNDEFINED; 30832b702b9bSPeter Hurley uport->cons = drv->cons; 3084959801feSPeter Hurley uport->minor = drv->tty_driver->minor_start + uport->line; 3085f7048b15SVignesh R uport->name = kasprintf(GFP_KERNEL, "%s%d", drv->dev_name, 3086f7048b15SVignesh R drv->tty_driver->name_base + uport->line); 3087f7048b15SVignesh R if (!uport->name) { 3088f7048b15SVignesh R ret = -ENOMEM; 3089f7048b15SVignesh R goto out; 3090f7048b15SVignesh R } 30912b702b9bSPeter Hurley 3092fe88c648SJohan Hovold /* 3093fe88c648SJohan Hovold * If this port is in use as a console then the spinlock is already 3094fe88c648SJohan Hovold * initialised. 3095fe88c648SJohan Hovold */ 3096452b9b24SJohn Ogness if (!uart_console_registered(uport)) 3097d2403cadSAndy Shevchenko uart_port_spin_lock_init(uport); 3098d2403cadSAndy Shevchenko 3099a208ffd2SGrant Likely if (uport->cons && uport->dev) 3100dd8b7a1dSMichal Simek of_console_check(uport->dev->of_node, uport->cons->name, uport->line); 3101ab4382d2SGreg Kroah-Hartman 3102fb2b9001SSudip Mukherjee tty_port_link_device(port, drv->tty_driver, uport->line); 3103ab4382d2SGreg Kroah-Hartman uart_configure_port(drv, state, uport); 3104ab4382d2SGreg Kroah-Hartman 31054dda864dSGeert Uytterhoeven port->console = uart_console(uport); 31064dda864dSGeert Uytterhoeven 3107266dcff0SGreg Kroah-Hartman num_groups = 2; 3108266dcff0SGreg Kroah-Hartman if (uport->attr_group) 3109266dcff0SGreg Kroah-Hartman num_groups++; 3110266dcff0SGreg Kroah-Hartman 3111c2b703b8SYoshihiro YUNOMAE uport->tty_groups = kcalloc(num_groups, sizeof(*uport->tty_groups), 3112266dcff0SGreg Kroah-Hartman GFP_KERNEL); 3113266dcff0SGreg Kroah-Hartman if (!uport->tty_groups) { 3114266dcff0SGreg Kroah-Hartman ret = -ENOMEM; 3115266dcff0SGreg Kroah-Hartman goto out; 3116266dcff0SGreg Kroah-Hartman } 3117266dcff0SGreg Kroah-Hartman uport->tty_groups[0] = &tty_dev_attr_group; 3118266dcff0SGreg Kroah-Hartman if (uport->attr_group) 3119266dcff0SGreg Kroah-Hartman uport->tty_groups[1] = uport->attr_group; 3120266dcff0SGreg Kroah-Hartman 3121ab4382d2SGreg Kroah-Hartman /* 3122ab4382d2SGreg Kroah-Hartman * Register the port whether it's detected or not. This allows 3123015355b7SGeert Uytterhoeven * setserial to be used to alter this port's parameters. 3124ab4382d2SGreg Kroah-Hartman */ 3125da4c2799SJohan Hovold tty_dev = tty_port_register_device_attr_serdev(port, drv->tty_driver, 3126266dcff0SGreg Kroah-Hartman uport->line, uport->dev, port, uport->tty_groups); 3127b289c496SChengguang Xu if (!IS_ERR(tty_dev)) { 312877359835SSimon Glass device_set_wakeup_capable(tty_dev, 1); 312977359835SSimon Glass } else { 31302f2dafe7SSudip Mukherjee dev_err(uport->dev, "Cannot register tty device on line %d\n", 3131ab4382d2SGreg Kroah-Hartman uport->line); 313277359835SSimon Glass } 3133ab4382d2SGreg Kroah-Hartman 3134ab4382d2SGreg Kroah-Hartman /* 3135ab4382d2SGreg Kroah-Hartman * Ensure UPF_DEAD is not set. 3136ab4382d2SGreg Kroah-Hartman */ 3137ab4382d2SGreg Kroah-Hartman uport->flags &= ~UPF_DEAD; 3138ab4382d2SGreg Kroah-Hartman 3139ab4382d2SGreg Kroah-Hartman out: 3140ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 3141ab4382d2SGreg Kroah-Hartman mutex_unlock(&port_mutex); 3142ab4382d2SGreg Kroah-Hartman 3143ab4382d2SGreg Kroah-Hartman return ret; 3144ab4382d2SGreg Kroah-Hartman } 314515dc475bSJiri Slaby EXPORT_SYMBOL(uart_add_one_port); 3146ab4382d2SGreg Kroah-Hartman 3147ab4382d2SGreg Kroah-Hartman /** 3148ab4382d2SGreg Kroah-Hartman * uart_remove_one_port - detach a driver defined port structure 3149ab4382d2SGreg Kroah-Hartman * @drv: pointer to the uart low level driver structure for this port 3150ab4382d2SGreg Kroah-Hartman * @uport: uart port structure for this port 3151ab4382d2SGreg Kroah-Hartman * 3152a157270fSAhmed S. Darwish * Context: task context, might sleep 3153a157270fSAhmed S. Darwish * 3154c4bd17a6SJiri Slaby * This unhooks (and hangs up) the specified port structure from the core 3155c4bd17a6SJiri Slaby * driver. No further calls will be made to the low-level code for this port. 3156ab4382d2SGreg Kroah-Hartman */ 3157ab4382d2SGreg Kroah-Hartman int uart_remove_one_port(struct uart_driver *drv, struct uart_port *uport) 3158ab4382d2SGreg Kroah-Hartman { 3159ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 3160ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 31614047b371SPeter Hurley struct uart_port *uart_port; 31624c6d5b4dSGeert Uytterhoeven struct tty_struct *tty; 3163b342dd51SChen Gang int ret = 0; 3164ab4382d2SGreg Kroah-Hartman 3165ab4382d2SGreg Kroah-Hartman mutex_lock(&port_mutex); 3166ab4382d2SGreg Kroah-Hartman 3167ab4382d2SGreg Kroah-Hartman /* 3168ab4382d2SGreg Kroah-Hartman * Mark the port "dead" - this prevents any opens from 3169ab4382d2SGreg Kroah-Hartman * succeeding while we shut down the port. 3170ab4382d2SGreg Kroah-Hartman */ 3171ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 31724047b371SPeter Hurley uart_port = uart_port_check(state); 31734047b371SPeter Hurley if (uart_port != uport) 31744047b371SPeter Hurley dev_alert(uport->dev, "Removing wrong port: %p != %p\n", 31754047b371SPeter Hurley uart_port, uport); 31764047b371SPeter Hurley 31774047b371SPeter Hurley if (!uart_port) { 3178b342dd51SChen Gang mutex_unlock(&port->mutex); 3179b342dd51SChen Gang ret = -EINVAL; 3180b342dd51SChen Gang goto out; 3181b342dd51SChen Gang } 3182ab4382d2SGreg Kroah-Hartman uport->flags |= UPF_DEAD; 3183ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 3184ab4382d2SGreg Kroah-Hartman 3185ab4382d2SGreg Kroah-Hartman /* 3186ab4382d2SGreg Kroah-Hartman * Remove the devices from the tty layer 3187ab4382d2SGreg Kroah-Hartman */ 3188da4c2799SJohan Hovold tty_port_unregister_device(port, drv->tty_driver, uport->line); 3189ab4382d2SGreg Kroah-Hartman 31904c6d5b4dSGeert Uytterhoeven tty = tty_port_tty_get(port); 31914c6d5b4dSGeert Uytterhoeven if (tty) { 3192ab4382d2SGreg Kroah-Hartman tty_vhangup(port->tty); 31934c6d5b4dSGeert Uytterhoeven tty_kref_put(tty); 31944c6d5b4dSGeert Uytterhoeven } 3195ab4382d2SGreg Kroah-Hartman 3196ab4382d2SGreg Kroah-Hartman /* 31975f5c9ae5SGeert Uytterhoeven * If the port is used as a console, unregister it 31985f5c9ae5SGeert Uytterhoeven */ 31995f5c9ae5SGeert Uytterhoeven if (uart_console(uport)) 32005f5c9ae5SGeert Uytterhoeven unregister_console(uport->cons); 32015f5c9ae5SGeert Uytterhoeven 32025f5c9ae5SGeert Uytterhoeven /* 3203ab4382d2SGreg Kroah-Hartman * Free the port IO and memory resources, if any. 3204ab4382d2SGreg Kroah-Hartman */ 3205a7cfaf16SFabio Estevam if (uport->type != PORT_UNKNOWN && uport->ops->release_port) 3206ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 3207266dcff0SGreg Kroah-Hartman kfree(uport->tty_groups); 3208f7048b15SVignesh R kfree(uport->name); 3209ab4382d2SGreg Kroah-Hartman 3210ab4382d2SGreg Kroah-Hartman /* 3211ab4382d2SGreg Kroah-Hartman * Indicate that there isn't a port here anymore. 3212ab4382d2SGreg Kroah-Hartman */ 3213ab4382d2SGreg Kroah-Hartman uport->type = PORT_UNKNOWN; 3214ab4382d2SGreg Kroah-Hartman 32154047b371SPeter Hurley mutex_lock(&port->mutex); 32169ed19428SPeter Hurley WARN_ON(atomic_dec_return(&state->refcount) < 0); 32179ed19428SPeter Hurley wait_event(state->remove_wait, !atomic_read(&state->refcount)); 3218ab4382d2SGreg Kroah-Hartman state->uart_port = NULL; 32194047b371SPeter Hurley mutex_unlock(&port->mutex); 3220b342dd51SChen Gang out: 3221ab4382d2SGreg Kroah-Hartman mutex_unlock(&port_mutex); 3222ab4382d2SGreg Kroah-Hartman 3223b342dd51SChen Gang return ret; 3224ab4382d2SGreg Kroah-Hartman } 322515dc475bSJiri Slaby EXPORT_SYMBOL(uart_remove_one_port); 3226ab4382d2SGreg Kroah-Hartman 3227c4bd17a6SJiri Slaby /** 3228c4bd17a6SJiri Slaby * uart_match_port - are the two ports equivalent? 3229c4bd17a6SJiri Slaby * @port1: first port 3230c4bd17a6SJiri Slaby * @port2: second port 3231c4bd17a6SJiri Slaby * 3232c4bd17a6SJiri Slaby * This utility function can be used to determine whether two uart_port 3233c4bd17a6SJiri Slaby * structures describe the same port. 3234ab4382d2SGreg Kroah-Hartman */ 3235b8be5db5SJiri Slaby bool uart_match_port(const struct uart_port *port1, 3236b8be5db5SJiri Slaby const struct uart_port *port2) 3237ab4382d2SGreg Kroah-Hartman { 3238ab4382d2SGreg Kroah-Hartman if (port1->iotype != port2->iotype) 3239b8be5db5SJiri Slaby return false; 3240ab4382d2SGreg Kroah-Hartman 3241ab4382d2SGreg Kroah-Hartman switch (port1->iotype) { 3242ab4382d2SGreg Kroah-Hartman case UPIO_PORT: 3243b8be5db5SJiri Slaby return port1->iobase == port2->iobase; 3244ab4382d2SGreg Kroah-Hartman case UPIO_HUB6: 3245b8be5db5SJiri Slaby return port1->iobase == port2->iobase && 3246b8be5db5SJiri Slaby port1->hub6 == port2->hub6; 3247ab4382d2SGreg Kroah-Hartman case UPIO_MEM: 3248bd94c407SMasahiro Yamada case UPIO_MEM16: 3249ab4382d2SGreg Kroah-Hartman case UPIO_MEM32: 32503ffb1a81SKevin Cernekee case UPIO_MEM32BE: 3251ab4382d2SGreg Kroah-Hartman case UPIO_AU: 3252ab4382d2SGreg Kroah-Hartman case UPIO_TSI: 3253b8be5db5SJiri Slaby return port1->mapbase == port2->mapbase; 3254ab4382d2SGreg Kroah-Hartman } 3255b8be5db5SJiri Slaby 3256b8be5db5SJiri Slaby return false; 3257ab4382d2SGreg Kroah-Hartman } 3258ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_match_port); 3259ab4382d2SGreg Kroah-Hartman 3260027d7dacSJiri Slaby /** 3261027d7dacSJiri Slaby * uart_handle_dcd_change - handle a change of carrier detect state 3262027d7dacSJiri Slaby * @uport: uart_port structure for the open port 32630388a152SIlpo Järvinen * @active: new carrier detect status 32644d90bb14SPeter Hurley * 3265987233b3SJiri Slaby * Caller must hold uport->lock. 3266027d7dacSJiri Slaby */ 32670388a152SIlpo Järvinen void uart_handle_dcd_change(struct uart_port *uport, bool active) 3268027d7dacSJiri Slaby { 326942381572SGeorge Spelvin struct tty_port *port = &uport->state->port; 327043eca0aeSAlan Cox struct tty_struct *tty = port->tty; 3271c993257bSPeter Hurley struct tty_ldisc *ld; 3272027d7dacSJiri Slaby 32734d90bb14SPeter Hurley lockdep_assert_held_once(&uport->lock); 32744d90bb14SPeter Hurley 3275c993257bSPeter Hurley if (tty) { 3276c993257bSPeter Hurley ld = tty_ldisc_ref(tty); 327742381572SGeorge Spelvin if (ld) { 327842381572SGeorge Spelvin if (ld->ops->dcd_change) 32790388a152SIlpo Järvinen ld->ops->dcd_change(tty, active); 328042381572SGeorge Spelvin tty_ldisc_deref(ld); 328142381572SGeorge Spelvin } 3282c993257bSPeter Hurley } 3283027d7dacSJiri Slaby 3284027d7dacSJiri Slaby uport->icount.dcd++; 3285027d7dacSJiri Slaby 3286299245a1SPeter Hurley if (uart_dcd_enabled(uport)) { 32870388a152SIlpo Järvinen if (active) 3288027d7dacSJiri Slaby wake_up_interruptible(&port->open_wait); 328943eca0aeSAlan Cox else if (tty) 329043eca0aeSAlan Cox tty_hangup(tty); 3291027d7dacSJiri Slaby } 3292027d7dacSJiri Slaby } 3293027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_handle_dcd_change); 3294027d7dacSJiri Slaby 3295027d7dacSJiri Slaby /** 3296027d7dacSJiri Slaby * uart_handle_cts_change - handle a change of clear-to-send state 3297027d7dacSJiri Slaby * @uport: uart_port structure for the open port 3298968d6457SIlpo Järvinen * @active: new clear-to-send status 32994d90bb14SPeter Hurley * 3300987233b3SJiri Slaby * Caller must hold uport->lock. 3301027d7dacSJiri Slaby */ 3302968d6457SIlpo Järvinen void uart_handle_cts_change(struct uart_port *uport, bool active) 3303027d7dacSJiri Slaby { 33044d90bb14SPeter Hurley lockdep_assert_held_once(&uport->lock); 33054d90bb14SPeter Hurley 3306027d7dacSJiri Slaby uport->icount.cts++; 3307027d7dacSJiri Slaby 3308391f93f2SPeter Hurley if (uart_softcts_mode(uport)) { 3309d01f4d18SPeter Hurley if (uport->hw_stopped) { 3310968d6457SIlpo Järvinen if (active) { 3311b5def43aSIlpo Järvinen uport->hw_stopped = false; 3312027d7dacSJiri Slaby uport->ops->start_tx(uport); 3313027d7dacSJiri Slaby uart_write_wakeup(uport); 3314027d7dacSJiri Slaby } 3315027d7dacSJiri Slaby } else { 3316968d6457SIlpo Järvinen if (!active) { 3317b5def43aSIlpo Järvinen uport->hw_stopped = true; 3318027d7dacSJiri Slaby uport->ops->stop_tx(uport); 3319027d7dacSJiri Slaby } 3320027d7dacSJiri Slaby } 3321391f93f2SPeter Hurley 3322027d7dacSJiri Slaby } 3323027d7dacSJiri Slaby } 3324027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_handle_cts_change); 3325027d7dacSJiri Slaby 3326cf75525fSJiri Slaby /** 3327cf75525fSJiri Slaby * uart_insert_char - push a char to the uart layer 3328cf75525fSJiri Slaby * 3329cf75525fSJiri Slaby * User is responsible to call tty_flip_buffer_push when they are done with 3330cf75525fSJiri Slaby * insertion. 3331cf75525fSJiri Slaby * 3332cf75525fSJiri Slaby * @port: corresponding port 3333cf75525fSJiri Slaby * @status: state of the serial port RX buffer (LSR for 8250) 3334cf75525fSJiri Slaby * @overrun: mask of overrun bits in @status 3335cf75525fSJiri Slaby * @ch: character to push 3336cf75525fSJiri Slaby * @flag: flag for the character (see TTY_NORMAL and friends) 3337cf75525fSJiri Slaby */ 3338027d7dacSJiri Slaby void uart_insert_char(struct uart_port *port, unsigned int status, 3339027d7dacSJiri Slaby unsigned int overrun, unsigned int ch, unsigned int flag) 3340027d7dacSJiri Slaby { 334192a19f9cSJiri Slaby struct tty_port *tport = &port->state->port; 3342027d7dacSJiri Slaby 3343027d7dacSJiri Slaby if ((status & port->ignore_status_mask & ~overrun) == 0) 334492a19f9cSJiri Slaby if (tty_insert_flip_char(tport, ch, flag) == 0) 3345dabfb351SCorbin ++port->icount.buf_overrun; 3346027d7dacSJiri Slaby 3347027d7dacSJiri Slaby /* 3348027d7dacSJiri Slaby * Overrun is special. Since it's reported immediately, 3349027d7dacSJiri Slaby * it doesn't affect the current character. 3350027d7dacSJiri Slaby */ 3351027d7dacSJiri Slaby if (status & ~port->ignore_status_mask & overrun) 335292a19f9cSJiri Slaby if (tty_insert_flip_char(tport, 0, TTY_OVERRUN) == 0) 3353dabfb351SCorbin ++port->icount.buf_overrun; 3354027d7dacSJiri Slaby } 3355027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_insert_char); 3356027d7dacSJiri Slaby 335768af4317SDmitry Safonov #ifdef CONFIG_MAGIC_SYSRQ_SERIAL 335868af4317SDmitry Safonov static const char sysrq_toggle_seq[] = CONFIG_MAGIC_SYSRQ_SERIAL_SEQUENCE; 335968af4317SDmitry Safonov 336068af4317SDmitry Safonov static void uart_sysrq_on(struct work_struct *w) 336168af4317SDmitry Safonov { 3362b18896ffSAndy Shevchenko int sysrq_toggle_seq_len = strlen(sysrq_toggle_seq); 3363b18896ffSAndy Shevchenko 336468af4317SDmitry Safonov sysrq_toggle_support(1); 3365b18896ffSAndy Shevchenko pr_info("SysRq is enabled by magic sequence '%*pE' on serial\n", 3366b18896ffSAndy Shevchenko sysrq_toggle_seq_len, sysrq_toggle_seq); 336768af4317SDmitry Safonov } 336868af4317SDmitry Safonov static DECLARE_WORK(sysrq_enable_work, uart_sysrq_on); 336968af4317SDmitry Safonov 337068af4317SDmitry Safonov /** 337168af4317SDmitry Safonov * uart_try_toggle_sysrq - Enables SysRq from serial line 337268af4317SDmitry Safonov * @port: uart_port structure where char(s) after BREAK met 337368af4317SDmitry Safonov * @ch: new character in the sequence after received BREAK 337468af4317SDmitry Safonov * 337568af4317SDmitry Safonov * Enables magic SysRq when the required sequence is met on port 337668af4317SDmitry Safonov * (see CONFIG_MAGIC_SYSRQ_SERIAL_SEQUENCE). 337768af4317SDmitry Safonov * 3378987233b3SJiri Slaby * Returns: %false if @ch is out of enabling sequence and should be 3379987233b3SJiri Slaby * handled some other way, %true if @ch was consumed. 338068af4317SDmitry Safonov */ 338108d54703SJohan Hovold bool uart_try_toggle_sysrq(struct uart_port *port, unsigned int ch) 338268af4317SDmitry Safonov { 33832ce5eaceSAndy Shevchenko int sysrq_toggle_seq_len = strlen(sysrq_toggle_seq); 33842ce5eaceSAndy Shevchenko 33852ce5eaceSAndy Shevchenko if (!sysrq_toggle_seq_len) 338668af4317SDmitry Safonov return false; 338768af4317SDmitry Safonov 338868af4317SDmitry Safonov BUILD_BUG_ON(ARRAY_SIZE(sysrq_toggle_seq) >= U8_MAX); 338968af4317SDmitry Safonov if (sysrq_toggle_seq[port->sysrq_seq] != ch) { 339068af4317SDmitry Safonov port->sysrq_seq = 0; 339168af4317SDmitry Safonov return false; 339268af4317SDmitry Safonov } 339368af4317SDmitry Safonov 33942ce5eaceSAndy Shevchenko if (++port->sysrq_seq < sysrq_toggle_seq_len) { 339568af4317SDmitry Safonov port->sysrq = jiffies + SYSRQ_TIMEOUT; 339668af4317SDmitry Safonov return true; 339768af4317SDmitry Safonov } 339868af4317SDmitry Safonov 339968af4317SDmitry Safonov schedule_work(&sysrq_enable_work); 340068af4317SDmitry Safonov 340168af4317SDmitry Safonov port->sysrq = 0; 340268af4317SDmitry Safonov return true; 340368af4317SDmitry Safonov } 340408d54703SJohan Hovold EXPORT_SYMBOL_GPL(uart_try_toggle_sysrq); 340568af4317SDmitry Safonov #endif 340668af4317SDmitry Safonov 3407ef838a81SUwe Kleine-König /** 3408743f93f8SLukas Wunner * uart_get_rs485_mode() - retrieve rs485 properties for given uart 3409a7172561SRandy Dunlap * @port: uart device's target port 3410ef838a81SUwe Kleine-König * 3411ef838a81SUwe Kleine-König * This function implements the device tree binding described in 3412ef838a81SUwe Kleine-König * Documentation/devicetree/bindings/serial/rs485.txt. 3413ef838a81SUwe Kleine-König */ 3414c150c0f3SLukas Wunner int uart_get_rs485_mode(struct uart_port *port) 3415ef838a81SUwe Kleine-König { 3416c150c0f3SLukas Wunner struct serial_rs485 *rs485conf = &port->rs485; 3417c150c0f3SLukas Wunner struct device *dev = port->dev; 3418ef838a81SUwe Kleine-König u32 rs485_delay[2]; 3419ef838a81SUwe Kleine-König int ret; 3420163f080eSChristoph Niedermaier int rx_during_tx_gpio_flag; 3421ef838a81SUwe Kleine-König 3422743f93f8SLukas Wunner ret = device_property_read_u32_array(dev, "rs485-rts-delay", 3423743f93f8SLukas Wunner rs485_delay, 2); 3424ef838a81SUwe Kleine-König if (!ret) { 3425ef838a81SUwe Kleine-König rs485conf->delay_rts_before_send = rs485_delay[0]; 3426ef838a81SUwe Kleine-König rs485conf->delay_rts_after_send = rs485_delay[1]; 3427ef838a81SUwe Kleine-König } else { 3428ef838a81SUwe Kleine-König rs485conf->delay_rts_before_send = 0; 3429ef838a81SUwe Kleine-König rs485conf->delay_rts_after_send = 0; 3430ef838a81SUwe Kleine-König } 3431ef838a81SUwe Kleine-König 34324dfd1035SLino Sanfilippo uart_sanitize_serial_rs485_delays(port, rs485conf); 34334dfd1035SLino Sanfilippo 3434ef838a81SUwe Kleine-König /* 3435f1e5b618SLukas Wunner * Clear full-duplex and enabled flags, set RTS polarity to active high 3436f1e5b618SLukas Wunner * to get to a defined state with the following properties: 3437ef838a81SUwe Kleine-König */ 3438f1e5b618SLukas Wunner rs485conf->flags &= ~(SER_RS485_RX_DURING_TX | SER_RS485_ENABLED | 3439d58a2df3SLukas Wunner SER_RS485_TERMINATE_BUS | 3440f1e5b618SLukas Wunner SER_RS485_RTS_AFTER_SEND); 3441f1e5b618SLukas Wunner rs485conf->flags |= SER_RS485_RTS_ON_SEND; 3442ef838a81SUwe Kleine-König 3443743f93f8SLukas Wunner if (device_property_read_bool(dev, "rs485-rx-during-tx")) 3444ef838a81SUwe Kleine-König rs485conf->flags |= SER_RS485_RX_DURING_TX; 3445ef838a81SUwe Kleine-König 3446743f93f8SLukas Wunner if (device_property_read_bool(dev, "linux,rs485-enabled-at-boot-time")) 3447ef838a81SUwe Kleine-König rs485conf->flags |= SER_RS485_ENABLED; 3448f1e5b618SLukas Wunner 3449f1e5b618SLukas Wunner if (device_property_read_bool(dev, "rs485-rts-active-low")) { 3450f1e5b618SLukas Wunner rs485conf->flags &= ~SER_RS485_RTS_ON_SEND; 3451f1e5b618SLukas Wunner rs485conf->flags |= SER_RS485_RTS_AFTER_SEND; 3452f1e5b618SLukas Wunner } 3453c150c0f3SLukas Wunner 3454d58a2df3SLukas Wunner /* 3455d58a2df3SLukas Wunner * Disabling termination by default is the safe choice: Else if many 3456d58a2df3SLukas Wunner * bus participants enable it, no communication is possible at all. 3457d58a2df3SLukas Wunner * Works fine for short cables and users may enable for longer cables. 3458d58a2df3SLukas Wunner */ 3459d58a2df3SLukas Wunner port->rs485_term_gpio = devm_gpiod_get_optional(dev, "rs485-term", 3460d58a2df3SLukas Wunner GPIOD_OUT_LOW); 3461d58a2df3SLukas Wunner if (IS_ERR(port->rs485_term_gpio)) { 3462d58a2df3SLukas Wunner ret = PTR_ERR(port->rs485_term_gpio); 3463d58a2df3SLukas Wunner port->rs485_term_gpio = NULL; 346489c65d66SKrzysztof Kozlowski return dev_err_probe(dev, ret, "Cannot get rs485-term-gpios\n"); 3465d58a2df3SLukas Wunner } 34668bec874fSIlpo Järvinen if (port->rs485_term_gpio) 34678bec874fSIlpo Järvinen port->rs485_supported.flags |= SER_RS485_TERMINATE_BUS; 3468d58a2df3SLukas Wunner 3469163f080eSChristoph Niedermaier rx_during_tx_gpio_flag = (rs485conf->flags & SER_RS485_RX_DURING_TX) ? 3470163f080eSChristoph Niedermaier GPIOD_OUT_HIGH : GPIOD_OUT_LOW; 3471163f080eSChristoph Niedermaier port->rs485_rx_during_tx_gpio = devm_gpiod_get_optional(dev, 3472163f080eSChristoph Niedermaier "rs485-rx-during-tx", 3473163f080eSChristoph Niedermaier rx_during_tx_gpio_flag); 3474163f080eSChristoph Niedermaier if (IS_ERR(port->rs485_rx_during_tx_gpio)) { 3475163f080eSChristoph Niedermaier ret = PTR_ERR(port->rs485_rx_during_tx_gpio); 3476163f080eSChristoph Niedermaier port->rs485_rx_during_tx_gpio = NULL; 3477163f080eSChristoph Niedermaier return dev_err_probe(dev, ret, "Cannot get rs485-rx-during-tx-gpios\n"); 3478163f080eSChristoph Niedermaier } 3479163f080eSChristoph Niedermaier 3480c150c0f3SLukas Wunner return 0; 3481ef838a81SUwe Kleine-König } 3482743f93f8SLukas Wunner EXPORT_SYMBOL_GPL(uart_get_rs485_mode); 3483ef838a81SUwe Kleine-König 34844f768e94SIlpo Järvinen /* Compile-time assertions for serial_rs485 layout */ 34854f768e94SIlpo Järvinen static_assert(offsetof(struct serial_rs485, padding) == 34864f768e94SIlpo Järvinen (offsetof(struct serial_rs485, delay_rts_after_send) + sizeof(__u32))); 34874f768e94SIlpo Järvinen static_assert(offsetof(struct serial_rs485, padding1) == 34884f768e94SIlpo Järvinen offsetof(struct serial_rs485, padding[1])); 34894f768e94SIlpo Järvinen static_assert((offsetof(struct serial_rs485, padding[4]) + sizeof(__u32)) == 34904f768e94SIlpo Järvinen sizeof(struct serial_rs485)); 34914f768e94SIlpo Järvinen 3492ab4382d2SGreg Kroah-Hartman MODULE_DESCRIPTION("Serial driver core"); 3493ab4382d2SGreg Kroah-Hartman MODULE_LICENSE("GPL"); 3494