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> 18a208ffd2SGrant Likely #include <linux/of.h> 19ab4382d2SGreg Kroah-Hartman #include <linux/proc_fs.h> 20ab4382d2SGreg Kroah-Hartman #include <linux/seq_file.h> 21ab4382d2SGreg Kroah-Hartman #include <linux/device.h> 22ab4382d2SGreg Kroah-Hartman #include <linux/serial.h> /* for serial_state and serial_icounter_struct */ 23ab4382d2SGreg Kroah-Hartman #include <linux/serial_core.h> 2468af4317SDmitry Safonov #include <linux/sysrq.h> 25ab4382d2SGreg Kroah-Hartman #include <linux/delay.h> 26ab4382d2SGreg Kroah-Hartman #include <linux/mutex.h> 2731f6bd7fSIlpo Järvinen #include <linux/math64.h> 28794edf30SDavid Howells #include <linux/security.h> 29ab4382d2SGreg Kroah-Hartman 30aef3ad10SAndy Shevchenko #include <linux/irq.h> 317c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 32ab4382d2SGreg Kroah-Hartman 33ab4382d2SGreg Kroah-Hartman /* 34ab4382d2SGreg Kroah-Hartman * This is used to lock changes in serial line configuration. 35ab4382d2SGreg Kroah-Hartman */ 36ab4382d2SGreg Kroah-Hartman static DEFINE_MUTEX(port_mutex); 37ab4382d2SGreg Kroah-Hartman 38ab4382d2SGreg Kroah-Hartman /* 39ab4382d2SGreg Kroah-Hartman * lockdep: port->lock is initialized in two places, but we 40ab4382d2SGreg Kroah-Hartman * want only one lock-class: 41ab4382d2SGreg Kroah-Hartman */ 42ab4382d2SGreg Kroah-Hartman static struct lock_class_key port_lock_key; 43ab4382d2SGreg Kroah-Hartman 44ab4382d2SGreg Kroah-Hartman #define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8) 45ab4382d2SGreg Kroah-Hartman 460ed12afaSLino Sanfilippo /* 470ed12afaSLino Sanfilippo * Max time with active RTS before/after data is sent. 480ed12afaSLino Sanfilippo */ 490ed12afaSLino Sanfilippo #define RS485_MAX_RTS_DELAY 100 /* msecs */ 500ed12afaSLino Sanfilippo 51ab4382d2SGreg Kroah-Hartman static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, 52a8c11c15SIlpo Järvinen const struct ktermios *old_termios); 531f33a51dSJiri Slaby static void uart_wait_until_sent(struct tty_struct *tty, int timeout); 546f538fe3SLinus Walleij static void uart_change_pm(struct uart_state *state, 556f538fe3SLinus Walleij enum uart_pm_state pm_state); 56ab4382d2SGreg Kroah-Hartman 57b922e19dSJiri Slaby static void uart_port_shutdown(struct tty_port *port); 58b922e19dSJiri Slaby 59299245a1SPeter Hurley static int uart_dcd_enabled(struct uart_port *uport) 60299245a1SPeter Hurley { 61d4260b51SPeter Hurley return !!(uport->status & UPSTAT_DCD_ENABLE); 62299245a1SPeter Hurley } 63299245a1SPeter Hurley 649ed19428SPeter Hurley static inline struct uart_port *uart_port_ref(struct uart_state *state) 659ed19428SPeter Hurley { 669ed19428SPeter Hurley if (atomic_add_unless(&state->refcount, 1, 0)) 679ed19428SPeter Hurley return state->uart_port; 689ed19428SPeter Hurley return NULL; 699ed19428SPeter Hurley } 709ed19428SPeter Hurley 719ed19428SPeter Hurley static inline void uart_port_deref(struct uart_port *uport) 729ed19428SPeter Hurley { 73ef510beaSAndy Shevchenko if (atomic_dec_and_test(&uport->state->refcount)) 749ed19428SPeter Hurley wake_up(&uport->state->remove_wait); 759ed19428SPeter Hurley } 769ed19428SPeter Hurley 779ed19428SPeter Hurley #define uart_port_lock(state, flags) \ 789ed19428SPeter Hurley ({ \ 799ed19428SPeter Hurley struct uart_port *__uport = uart_port_ref(state); \ 809ed19428SPeter Hurley if (__uport) \ 819ed19428SPeter Hurley spin_lock_irqsave(&__uport->lock, flags); \ 829ed19428SPeter Hurley __uport; \ 839ed19428SPeter Hurley }) 849ed19428SPeter Hurley 859ed19428SPeter Hurley #define uart_port_unlock(uport, flags) \ 869ed19428SPeter Hurley ({ \ 879ed19428SPeter Hurley struct uart_port *__uport = uport; \ 88ef510beaSAndy Shevchenko if (__uport) { \ 899ed19428SPeter Hurley spin_unlock_irqrestore(&__uport->lock, flags); \ 909ed19428SPeter Hurley uart_port_deref(__uport); \ 91ef510beaSAndy Shevchenko } \ 929ed19428SPeter Hurley }) 939ed19428SPeter Hurley 944047b371SPeter Hurley static inline struct uart_port *uart_port_check(struct uart_state *state) 954047b371SPeter Hurley { 967da4b8b7SPeter Hurley lockdep_assert_held(&state->port.mutex); 974047b371SPeter Hurley return state->uart_port; 984047b371SPeter Hurley } 994047b371SPeter Hurley 100c4bd17a6SJiri Slaby /** 101c4bd17a6SJiri Slaby * uart_write_wakeup - schedule write processing 102c4bd17a6SJiri Slaby * @port: port to be processed 103c4bd17a6SJiri Slaby * 104c4bd17a6SJiri Slaby * This routine is used by the interrupt handler to schedule processing in the 105c4bd17a6SJiri Slaby * software interrupt portion of the driver. A driver is expected to call this 106c4bd17a6SJiri Slaby * function when the number of characters in the transmit buffer have dropped 107c4bd17a6SJiri Slaby * below a threshold. 108c4bd17a6SJiri Slaby * 109c4bd17a6SJiri Slaby * Locking: @port->lock should be held 110ab4382d2SGreg Kroah-Hartman */ 111ab4382d2SGreg Kroah-Hartman void uart_write_wakeup(struct uart_port *port) 112ab4382d2SGreg Kroah-Hartman { 113ab4382d2SGreg Kroah-Hartman struct uart_state *state = port->state; 114ab4382d2SGreg Kroah-Hartman /* 115ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 116ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 117ab4382d2SGreg Kroah-Hartman */ 118ab4382d2SGreg Kroah-Hartman BUG_ON(!state); 119d0f4bce2SRob Herring tty_port_tty_wakeup(&state->port); 120ab4382d2SGreg Kroah-Hartman } 12115dc475bSJiri Slaby EXPORT_SYMBOL(uart_write_wakeup); 122ab4382d2SGreg Kroah-Hartman 123ab4382d2SGreg Kroah-Hartman static void uart_stop(struct tty_struct *tty) 124ab4382d2SGreg Kroah-Hartman { 125ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1269ed19428SPeter Hurley struct uart_port *port; 127ab4382d2SGreg Kroah-Hartman unsigned long flags; 128ab4382d2SGreg Kroah-Hartman 1299ed19428SPeter Hurley port = uart_port_lock(state, flags); 1309ed19428SPeter Hurley if (port) 131ab4382d2SGreg Kroah-Hartman port->ops->stop_tx(port); 1329ed19428SPeter Hurley uart_port_unlock(port, flags); 133ab4382d2SGreg Kroah-Hartman } 134ab4382d2SGreg Kroah-Hartman 135ab4382d2SGreg Kroah-Hartman static void __uart_start(struct tty_struct *tty) 136ab4382d2SGreg Kroah-Hartman { 137ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 138ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 139ab4382d2SGreg Kroah-Hartman 1409ed19428SPeter Hurley if (port && !uart_tx_stopped(port)) 141ab4382d2SGreg Kroah-Hartman port->ops->start_tx(port); 142ab4382d2SGreg Kroah-Hartman } 143ab4382d2SGreg Kroah-Hartman 144ab4382d2SGreg Kroah-Hartman static void uart_start(struct tty_struct *tty) 145ab4382d2SGreg Kroah-Hartman { 146ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1479ed19428SPeter Hurley struct uart_port *port; 148ab4382d2SGreg Kroah-Hartman unsigned long flags; 149ab4382d2SGreg Kroah-Hartman 1509ed19428SPeter Hurley port = uart_port_lock(state, flags); 151ab4382d2SGreg Kroah-Hartman __uart_start(tty); 1529ed19428SPeter Hurley uart_port_unlock(port, flags); 153ab4382d2SGreg Kroah-Hartman } 154ab4382d2SGreg Kroah-Hartman 155f4581cabSDenys Vlasenko static void 156ab4382d2SGreg Kroah-Hartman uart_update_mctrl(struct uart_port *port, unsigned int set, unsigned int clear) 157ab4382d2SGreg Kroah-Hartman { 158ab4382d2SGreg Kroah-Hartman unsigned long flags; 159ab4382d2SGreg Kroah-Hartman unsigned int old; 160ab4382d2SGreg Kroah-Hartman 161ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 162ab4382d2SGreg Kroah-Hartman old = port->mctrl; 163ab4382d2SGreg Kroah-Hartman port->mctrl = (old & ~clear) | set; 1647c7f9bc9SLukas Wunner if (old != port->mctrl && !(port->rs485.flags & SER_RS485_ENABLED)) 165ab4382d2SGreg Kroah-Hartman port->ops->set_mctrl(port, port->mctrl); 166ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 167ab4382d2SGreg Kroah-Hartman } 168ab4382d2SGreg Kroah-Hartman 169ab4382d2SGreg Kroah-Hartman #define uart_set_mctrl(port, set) uart_update_mctrl(port, set, 0) 170ab4382d2SGreg Kroah-Hartman #define uart_clear_mctrl(port, clear) uart_update_mctrl(port, 0, clear) 171ab4382d2SGreg Kroah-Hartman 172a6845e1eSRafael Gago static void uart_port_dtr_rts(struct uart_port *uport, int raise) 173a6845e1eSRafael Gago { 1742dd8a74fSLukas Wunner if (raise) 175a6845e1eSRafael Gago uart_set_mctrl(uport, TIOCM_DTR | TIOCM_RTS); 1762dd8a74fSLukas Wunner else 1772dd8a74fSLukas Wunner uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); 178a6845e1eSRafael Gago } 179a6845e1eSRafael Gago 180ab4382d2SGreg Kroah-Hartman /* 181ab4382d2SGreg Kroah-Hartman * Startup the port. This will be called once per open. All calls 182ab4382d2SGreg Kroah-Hartman * will be serialised by the per-port mutex. 183ab4382d2SGreg Kroah-Hartman */ 184c0d92be6SJiri Slaby static int uart_port_startup(struct tty_struct *tty, struct uart_state *state, 185dcd794c6SIlpo Järvinen bool init_hw) 186ab4382d2SGreg Kroah-Hartman { 1874047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 18818ee37e1SJohan Hovold unsigned long flags; 189ab4382d2SGreg Kroah-Hartman unsigned long page; 190ab4382d2SGreg Kroah-Hartman int retval = 0; 191ab4382d2SGreg Kroah-Hartman 192ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) 193c0d92be6SJiri Slaby return 1; 194ab4382d2SGreg Kroah-Hartman 195ab4382d2SGreg Kroah-Hartman /* 1967deb39edSThomas Pfaff * Make sure the device is in D0 state. 1977deb39edSThomas Pfaff */ 1987deb39edSThomas Pfaff uart_change_pm(state, UART_PM_STATE_ON); 1997deb39edSThomas Pfaff 2007deb39edSThomas Pfaff /* 201ab4382d2SGreg Kroah-Hartman * Initialise and allocate the transmit and temporary 202ab4382d2SGreg Kroah-Hartman * buffer. 203ab4382d2SGreg Kroah-Hartman */ 204ab4382d2SGreg Kroah-Hartman page = get_zeroed_page(GFP_KERNEL); 205ab4382d2SGreg Kroah-Hartman if (!page) 206ab4382d2SGreg Kroah-Hartman return -ENOMEM; 207ab4382d2SGreg Kroah-Hartman 208a5ba1d95STycho Andersen uart_port_lock(state, flags); 209a5ba1d95STycho Andersen if (!state->xmit.buf) { 210ab4382d2SGreg Kroah-Hartman state->xmit.buf = (unsigned char *) page; 211ab4382d2SGreg Kroah-Hartman uart_circ_clear(&state->xmit); 212d7240214SSergey Senozhatsky uart_port_unlock(uport, flags); 213a5ba1d95STycho Andersen } else { 214d7240214SSergey Senozhatsky uart_port_unlock(uport, flags); 215d7240214SSergey Senozhatsky /* 216d7240214SSergey Senozhatsky * Do not free() the page under the port lock, see 217d7240214SSergey Senozhatsky * uart_shutdown(). 218d7240214SSergey Senozhatsky */ 219a5ba1d95STycho Andersen free_page(page); 220ab4382d2SGreg Kroah-Hartman } 221ab4382d2SGreg Kroah-Hartman 222ab4382d2SGreg Kroah-Hartman retval = uport->ops->startup(uport); 223ab4382d2SGreg Kroah-Hartman if (retval == 0) { 224c7d7abffSJiri Slaby if (uart_console(uport) && uport->cons->cflag) { 225adc8d746SAlan Cox tty->termios.c_cflag = uport->cons->cflag; 226027b5717SPali Rohár tty->termios.c_ispeed = uport->cons->ispeed; 227027b5717SPali Rohár tty->termios.c_ospeed = uport->cons->ospeed; 228c7d7abffSJiri Slaby uport->cons->cflag = 0; 229027b5717SPali Rohár uport->cons->ispeed = 0; 230027b5717SPali Rohár uport->cons->ospeed = 0; 231c7d7abffSJiri Slaby } 232ab4382d2SGreg Kroah-Hartman /* 233ab4382d2SGreg Kroah-Hartman * Initialise the hardware port settings. 234ab4382d2SGreg Kroah-Hartman */ 235ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 236ab4382d2SGreg Kroah-Hartman 237ab4382d2SGreg Kroah-Hartman /* 238ab4382d2SGreg Kroah-Hartman * Setup the RTS and DTR signals once the 239ab4382d2SGreg Kroah-Hartman * port is open and ready to respond. 240ab4382d2SGreg Kroah-Hartman */ 2419db276f8SPeter Hurley if (init_hw && C_BAUD(tty)) 242a6845e1eSRafael Gago uart_port_dtr_rts(uport, 1); 243ab4382d2SGreg Kroah-Hartman } 244ab4382d2SGreg Kroah-Hartman 2450055197eSJiri Slaby /* 2460055197eSJiri Slaby * This is to allow setserial on this port. People may want to set 2470055197eSJiri Slaby * port/irq/type and then reconfigure the port properly if it failed 2480055197eSJiri Slaby * now. 2490055197eSJiri Slaby */ 250ab4382d2SGreg Kroah-Hartman if (retval && capable(CAP_SYS_ADMIN)) 251c0d92be6SJiri Slaby return 1; 252c0d92be6SJiri Slaby 253c0d92be6SJiri Slaby return retval; 254c0d92be6SJiri Slaby } 255c0d92be6SJiri Slaby 256c0d92be6SJiri Slaby static int uart_startup(struct tty_struct *tty, struct uart_state *state, 257dcd794c6SIlpo Järvinen bool init_hw) 258c0d92be6SJiri Slaby { 259c0d92be6SJiri Slaby struct tty_port *port = &state->port; 260c0d92be6SJiri Slaby int retval; 261c0d92be6SJiri Slaby 262d41861caSPeter Hurley if (tty_port_initialized(port)) 263c0d92be6SJiri Slaby return 0; 264c0d92be6SJiri Slaby 265c0d92be6SJiri Slaby retval = uart_port_startup(tty, state, init_hw); 266b3b57646SRob Herring if (retval) 267b3b57646SRob Herring set_bit(TTY_IO_ERROR, &tty->flags); 268ab4382d2SGreg Kroah-Hartman 269ab4382d2SGreg Kroah-Hartman return retval; 270ab4382d2SGreg Kroah-Hartman } 271ab4382d2SGreg Kroah-Hartman 272ab4382d2SGreg Kroah-Hartman /* 273ab4382d2SGreg Kroah-Hartman * This routine will shutdown a serial port; interrupts are disabled, and 274ab4382d2SGreg Kroah-Hartman * DTR is dropped if the hangup on close termio flag is on. Calls to 275ab4382d2SGreg Kroah-Hartman * uart_shutdown are serialised by the per-port semaphore. 276af224ca2SPeter Hurley * 277af224ca2SPeter Hurley * uport == NULL if uart_port has already been removed 278ab4382d2SGreg Kroah-Hartman */ 279ab4382d2SGreg Kroah-Hartman static void uart_shutdown(struct tty_struct *tty, struct uart_state *state) 280ab4382d2SGreg Kroah-Hartman { 2814047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 282ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 28318ee37e1SJohan Hovold unsigned long flags; 284d7240214SSergey Senozhatsky char *xmit_buf = NULL; 285ab4382d2SGreg Kroah-Hartman 286ab4382d2SGreg Kroah-Hartman /* 287ab4382d2SGreg Kroah-Hartman * Set the TTY IO error marker 288ab4382d2SGreg Kroah-Hartman */ 289ab4382d2SGreg Kroah-Hartman if (tty) 290ab4382d2SGreg Kroah-Hartman set_bit(TTY_IO_ERROR, &tty->flags); 291ab4382d2SGreg Kroah-Hartman 292d41861caSPeter Hurley if (tty_port_initialized(port)) { 293515be7baSIlpo Järvinen tty_port_set_initialized(port, false); 294d41861caSPeter Hurley 295ab4382d2SGreg Kroah-Hartman /* 296ab4382d2SGreg Kroah-Hartman * Turn off DTR and RTS early. 297ab4382d2SGreg Kroah-Hartman */ 298027b5717SPali Rohár if (uport && uart_console(uport) && tty) { 299ae84db96SPeter Hurley uport->cons->cflag = tty->termios.c_cflag; 300027b5717SPali Rohár uport->cons->ispeed = tty->termios.c_ispeed; 301027b5717SPali Rohár uport->cons->ospeed = tty->termios.c_ospeed; 302027b5717SPali Rohár } 303ae84db96SPeter Hurley 3049db276f8SPeter Hurley if (!tty || C_HUPCL(tty)) 305a6845e1eSRafael Gago uart_port_dtr_rts(uport, 0); 306ab4382d2SGreg Kroah-Hartman 307b922e19dSJiri Slaby uart_port_shutdown(port); 308ab4382d2SGreg Kroah-Hartman } 309ab4382d2SGreg Kroah-Hartman 310ab4382d2SGreg Kroah-Hartman /* 311d208a3bfSDoug Anderson * It's possible for shutdown to be called after suspend if we get 312d208a3bfSDoug Anderson * a DCD drop (hangup) at just the right time. Clear suspended bit so 313d208a3bfSDoug Anderson * we don't try to resume a port that has been shutdown. 314ab4382d2SGreg Kroah-Hartman */ 31575b20a2aSIlpo Järvinen tty_port_set_suspended(port, false); 316ab4382d2SGreg Kroah-Hartman 317ab4382d2SGreg Kroah-Hartman /* 318d7240214SSergey Senozhatsky * Do not free() the transmit buffer page under the port lock since 319d7240214SSergey Senozhatsky * this can create various circular locking scenarios. For instance, 320d7240214SSergey Senozhatsky * console driver may need to allocate/free a debug object, which 321d7240214SSergey Senozhatsky * can endup in printk() recursion. 322ab4382d2SGreg Kroah-Hartman */ 323a5ba1d95STycho Andersen uart_port_lock(state, flags); 324d7240214SSergey Senozhatsky xmit_buf = state->xmit.buf; 325ab4382d2SGreg Kroah-Hartman state->xmit.buf = NULL; 326a5ba1d95STycho Andersen uart_port_unlock(uport, flags); 327d7240214SSergey Senozhatsky 328d7240214SSergey Senozhatsky free_page((unsigned long)xmit_buf); 329ab4382d2SGreg Kroah-Hartman } 330ab4382d2SGreg Kroah-Hartman 331ab4382d2SGreg Kroah-Hartman /** 332c4bd17a6SJiri Slaby * uart_update_timeout - update per-port frame timing information 333ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port 334ab4382d2SGreg Kroah-Hartman * @cflag: termios cflag value 335ab4382d2SGreg Kroah-Hartman * @baud: speed of the port 336ab4382d2SGreg Kroah-Hartman * 337c4bd17a6SJiri Slaby * Set the @port frame timing information from which the FIFO timeout value is 338c4bd17a6SJiri Slaby * derived. The @cflag value should reflect the actual hardware settings as 339c4bd17a6SJiri Slaby * number of bits, parity, stop bits and baud rate is taken into account here. 340c4bd17a6SJiri Slaby * 341c4bd17a6SJiri Slaby * Locking: caller is expected to take @port->lock 342ab4382d2SGreg Kroah-Hartman */ 343ab4382d2SGreg Kroah-Hartman void 344ab4382d2SGreg Kroah-Hartman uart_update_timeout(struct uart_port *port, unsigned int cflag, 345ab4382d2SGreg Kroah-Hartman unsigned int baud) 346ab4382d2SGreg Kroah-Hartman { 34731f6bd7fSIlpo Järvinen unsigned int size = tty_get_frame_size(cflag); 34831f6bd7fSIlpo Järvinen u64 frame_time; 349ab4382d2SGreg Kroah-Hartman 35031f6bd7fSIlpo Järvinen frame_time = (u64)size * NSEC_PER_SEC; 35131f6bd7fSIlpo Järvinen port->frame_time = DIV64_U64_ROUND_UP(frame_time, baud); 352ab4382d2SGreg Kroah-Hartman } 353ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_update_timeout); 354ab4382d2SGreg Kroah-Hartman 355ab4382d2SGreg Kroah-Hartman /** 356ab4382d2SGreg Kroah-Hartman * uart_get_baud_rate - return baud rate for a particular port 357ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port in question. 358c4bd17a6SJiri Slaby * @termios: desired termios settings 359c4bd17a6SJiri Slaby * @old: old termios (or %NULL) 360ab4382d2SGreg Kroah-Hartman * @min: minimum acceptable baud rate 361ab4382d2SGreg Kroah-Hartman * @max: maximum acceptable baud rate 362ab4382d2SGreg Kroah-Hartman * 363c4bd17a6SJiri Slaby * Decode the termios structure into a numeric baud rate, taking account of the 364c4bd17a6SJiri Slaby * magic 38400 baud rate (with spd_* flags), and mapping the %B0 rate to 9600 365c4bd17a6SJiri Slaby * baud. 366ab4382d2SGreg Kroah-Hartman * 367c4bd17a6SJiri Slaby * If the new baud rate is invalid, try the @old termios setting. If it's still 368c4bd17a6SJiri Slaby * invalid, we try 9600 baud. 369ab4382d2SGreg Kroah-Hartman * 370c4bd17a6SJiri Slaby * The @termios structure is updated to reflect the baud rate we're actually 371c4bd17a6SJiri Slaby * going to be using. Don't do this for the case where B0 is requested ("hang 372c4bd17a6SJiri Slaby * up"). 373c4bd17a6SJiri Slaby * 374c4bd17a6SJiri Slaby * Locking: caller dependent 375ab4382d2SGreg Kroah-Hartman */ 376ab4382d2SGreg Kroah-Hartman unsigned int 377ab4382d2SGreg Kroah-Hartman uart_get_baud_rate(struct uart_port *port, struct ktermios *termios, 378bec5b814SIlpo Järvinen const struct ktermios *old, unsigned int min, unsigned int max) 379ab4382d2SGreg Kroah-Hartman { 380f10a2233SJoakim Nordell unsigned int try; 381f10a2233SJoakim Nordell unsigned int baud; 382f10a2233SJoakim Nordell unsigned int altbaud; 383ab4382d2SGreg Kroah-Hartman int hung_up = 0; 384ab4382d2SGreg Kroah-Hartman upf_t flags = port->flags & UPF_SPD_MASK; 385ab4382d2SGreg Kroah-Hartman 386f10a2233SJoakim Nordell switch (flags) { 387f10a2233SJoakim Nordell case UPF_SPD_HI: 388ab4382d2SGreg Kroah-Hartman altbaud = 57600; 389f10a2233SJoakim Nordell break; 390f10a2233SJoakim Nordell case UPF_SPD_VHI: 391ab4382d2SGreg Kroah-Hartman altbaud = 115200; 392f10a2233SJoakim Nordell break; 393f10a2233SJoakim Nordell case UPF_SPD_SHI: 394ab4382d2SGreg Kroah-Hartman altbaud = 230400; 395f10a2233SJoakim Nordell break; 396f10a2233SJoakim Nordell case UPF_SPD_WARP: 397ab4382d2SGreg Kroah-Hartman altbaud = 460800; 398f10a2233SJoakim Nordell break; 399f10a2233SJoakim Nordell default: 400f10a2233SJoakim Nordell altbaud = 38400; 401f10a2233SJoakim Nordell break; 402f10a2233SJoakim Nordell } 403ab4382d2SGreg Kroah-Hartman 404ab4382d2SGreg Kroah-Hartman for (try = 0; try < 2; try++) { 405ab4382d2SGreg Kroah-Hartman baud = tty_termios_baud_rate(termios); 406ab4382d2SGreg Kroah-Hartman 407ab4382d2SGreg Kroah-Hartman /* 408ab4382d2SGreg Kroah-Hartman * The spd_hi, spd_vhi, spd_shi, spd_warp kludge... 409ab4382d2SGreg Kroah-Hartman * Die! Die! Die! 410ab4382d2SGreg Kroah-Hartman */ 411547039ecSPeter Hurley if (try == 0 && baud == 38400) 412ab4382d2SGreg Kroah-Hartman baud = altbaud; 413ab4382d2SGreg Kroah-Hartman 414ab4382d2SGreg Kroah-Hartman /* 415ab4382d2SGreg Kroah-Hartman * Special case: B0 rate. 416ab4382d2SGreg Kroah-Hartman */ 417ab4382d2SGreg Kroah-Hartman if (baud == 0) { 418ab4382d2SGreg Kroah-Hartman hung_up = 1; 419ab4382d2SGreg Kroah-Hartman baud = 9600; 420ab4382d2SGreg Kroah-Hartman } 421ab4382d2SGreg Kroah-Hartman 422ab4382d2SGreg Kroah-Hartman if (baud >= min && baud <= max) 423ab4382d2SGreg Kroah-Hartman return baud; 424ab4382d2SGreg Kroah-Hartman 425ab4382d2SGreg Kroah-Hartman /* 426ab4382d2SGreg Kroah-Hartman * Oops, the quotient was zero. Try again with 427ab4382d2SGreg Kroah-Hartman * the old baud rate if possible. 428ab4382d2SGreg Kroah-Hartman */ 429ab4382d2SGreg Kroah-Hartman termios->c_cflag &= ~CBAUD; 430ab4382d2SGreg Kroah-Hartman if (old) { 431ab4382d2SGreg Kroah-Hartman baud = tty_termios_baud_rate(old); 432ab4382d2SGreg Kroah-Hartman if (!hung_up) 433ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 434ab4382d2SGreg Kroah-Hartman baud, baud); 435ab4382d2SGreg Kroah-Hartman old = NULL; 436ab4382d2SGreg Kroah-Hartman continue; 437ab4382d2SGreg Kroah-Hartman } 438ab4382d2SGreg Kroah-Hartman 439ab4382d2SGreg Kroah-Hartman /* 440ab4382d2SGreg Kroah-Hartman * As a last resort, if the range cannot be met then clip to 441ab4382d2SGreg Kroah-Hartman * the nearest chip supported rate. 442ab4382d2SGreg Kroah-Hartman */ 443ab4382d2SGreg Kroah-Hartman if (!hung_up) { 444ab4382d2SGreg Kroah-Hartman if (baud <= min) 445ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 446ab4382d2SGreg Kroah-Hartman min + 1, min + 1); 447ab4382d2SGreg Kroah-Hartman else 448ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 449ab4382d2SGreg Kroah-Hartman max - 1, max - 1); 450ab4382d2SGreg Kroah-Hartman } 451ab4382d2SGreg Kroah-Hartman } 452ab4382d2SGreg Kroah-Hartman /* Should never happen */ 453ab4382d2SGreg Kroah-Hartman WARN_ON(1); 454ab4382d2SGreg Kroah-Hartman return 0; 455ab4382d2SGreg Kroah-Hartman } 456ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_get_baud_rate); 457ab4382d2SGreg Kroah-Hartman 458ab4382d2SGreg Kroah-Hartman /** 459ab4382d2SGreg Kroah-Hartman * uart_get_divisor - return uart clock divisor 460c4bd17a6SJiri Slaby * @port: uart_port structure describing the port 461ab4382d2SGreg Kroah-Hartman * @baud: desired baud rate 462ab4382d2SGreg Kroah-Hartman * 463c4bd17a6SJiri Slaby * Calculate the divisor (baud_base / baud) for the specified @baud, 464c4bd17a6SJiri Slaby * appropriately rounded. 465c4bd17a6SJiri Slaby * 466c4bd17a6SJiri Slaby * If 38400 baud and custom divisor is selected, return the custom divisor 467c4bd17a6SJiri Slaby * instead. 468c4bd17a6SJiri Slaby * 469c4bd17a6SJiri Slaby * Locking: caller dependent 470ab4382d2SGreg Kroah-Hartman */ 471ab4382d2SGreg Kroah-Hartman unsigned int 472ab4382d2SGreg Kroah-Hartman uart_get_divisor(struct uart_port *port, unsigned int baud) 473ab4382d2SGreg Kroah-Hartman { 474ab4382d2SGreg Kroah-Hartman unsigned int quot; 475ab4382d2SGreg Kroah-Hartman 476ab4382d2SGreg Kroah-Hartman /* 477ab4382d2SGreg Kroah-Hartman * Old custom speed handling. 478ab4382d2SGreg Kroah-Hartman */ 479ab4382d2SGreg Kroah-Hartman if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) 480ab4382d2SGreg Kroah-Hartman quot = port->custom_divisor; 481ab4382d2SGreg Kroah-Hartman else 48297d24634SUwe Kleine-König quot = DIV_ROUND_CLOSEST(port->uartclk, 16 * baud); 483ab4382d2SGreg Kroah-Hartman 484ab4382d2SGreg Kroah-Hartman return quot; 485ab4382d2SGreg Kroah-Hartman } 486ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_get_divisor); 487ab4382d2SGreg Kroah-Hartman 4887c8ab967SPeter Hurley /* Caller holds port mutex */ 489ab4382d2SGreg Kroah-Hartman static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, 490a8c11c15SIlpo Järvinen const struct ktermios *old_termios) 491ab4382d2SGreg Kroah-Hartman { 4924047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 493ab4382d2SGreg Kroah-Hartman struct ktermios *termios; 494391f93f2SPeter Hurley int hw_stopped; 495ab4382d2SGreg Kroah-Hartman 496ab4382d2SGreg Kroah-Hartman /* 497ab4382d2SGreg Kroah-Hartman * If we have no tty, termios, or the port does not exist, 498ab4382d2SGreg Kroah-Hartman * then we can't set the parameters for this port. 499ab4382d2SGreg Kroah-Hartman */ 500adc8d746SAlan Cox if (!tty || uport->type == PORT_UNKNOWN) 501ab4382d2SGreg Kroah-Hartman return; 502ab4382d2SGreg Kroah-Hartman 503adc8d746SAlan Cox termios = &tty->termios; 504c18b55fdSPeter Hurley uport->ops->set_termios(uport, termios, old_termios); 505ab4382d2SGreg Kroah-Hartman 506ab4382d2SGreg Kroah-Hartman /* 507299245a1SPeter Hurley * Set modem status enables based on termios cflag 508ab4382d2SGreg Kroah-Hartman */ 509299245a1SPeter Hurley spin_lock_irq(&uport->lock); 510ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CRTSCTS) 511299245a1SPeter Hurley uport->status |= UPSTAT_CTS_ENABLE; 512ab4382d2SGreg Kroah-Hartman else 513299245a1SPeter Hurley uport->status &= ~UPSTAT_CTS_ENABLE; 514ab4382d2SGreg Kroah-Hartman 515ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CLOCAL) 516299245a1SPeter Hurley uport->status &= ~UPSTAT_DCD_ENABLE; 517ab4382d2SGreg Kroah-Hartman else 518299245a1SPeter Hurley uport->status |= UPSTAT_DCD_ENABLE; 519391f93f2SPeter Hurley 520391f93f2SPeter Hurley /* reset sw-assisted CTS flow control based on (possibly) new mode */ 521391f93f2SPeter Hurley hw_stopped = uport->hw_stopped; 522391f93f2SPeter Hurley uport->hw_stopped = uart_softcts_mode(uport) && 523391f93f2SPeter Hurley !(uport->ops->get_mctrl(uport) & TIOCM_CTS); 524391f93f2SPeter Hurley if (uport->hw_stopped) { 525391f93f2SPeter Hurley if (!hw_stopped) 526391f93f2SPeter Hurley uport->ops->stop_tx(uport); 527391f93f2SPeter Hurley } else { 528391f93f2SPeter Hurley if (hw_stopped) 529391f93f2SPeter Hurley __uart_start(tty); 530391f93f2SPeter Hurley } 531299245a1SPeter Hurley spin_unlock_irq(&uport->lock); 532ab4382d2SGreg Kroah-Hartman } 533ab4382d2SGreg Kroah-Hartman 534f5291eccSPeter Hurley static int uart_put_char(struct tty_struct *tty, unsigned char c) 535ab4382d2SGreg Kroah-Hartman { 536f5291eccSPeter Hurley struct uart_state *state = tty->driver_data; 5379ed19428SPeter Hurley struct uart_port *port; 538f5291eccSPeter Hurley struct circ_buf *circ; 539ab4382d2SGreg Kroah-Hartman unsigned long flags; 540ab4382d2SGreg Kroah-Hartman int ret = 0; 541ab4382d2SGreg Kroah-Hartman 542f5291eccSPeter Hurley circ = &state->xmit; 5439ed19428SPeter Hurley port = uart_port_lock(state, flags); 544aff9cf59SSamir Virmani if (!circ->buf) { 545aff9cf59SSamir Virmani uart_port_unlock(port, flags); 546aff9cf59SSamir Virmani return 0; 547aff9cf59SSamir Virmani } 548aff9cf59SSamir Virmani 5499ed19428SPeter Hurley if (port && uart_circ_chars_free(circ) != 0) { 550ab4382d2SGreg Kroah-Hartman circ->buf[circ->head] = c; 551ab4382d2SGreg Kroah-Hartman circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1); 552ab4382d2SGreg Kroah-Hartman ret = 1; 553ab4382d2SGreg Kroah-Hartman } 5549ed19428SPeter Hurley uart_port_unlock(port, flags); 555ab4382d2SGreg Kroah-Hartman return ret; 556ab4382d2SGreg Kroah-Hartman } 557ab4382d2SGreg Kroah-Hartman 558ab4382d2SGreg Kroah-Hartman static void uart_flush_chars(struct tty_struct *tty) 559ab4382d2SGreg Kroah-Hartman { 560ab4382d2SGreg Kroah-Hartman uart_start(tty); 561ab4382d2SGreg Kroah-Hartman } 562ab4382d2SGreg Kroah-Hartman 563ab4382d2SGreg Kroah-Hartman static int uart_write(struct tty_struct *tty, 564ab4382d2SGreg Kroah-Hartman const unsigned char *buf, int count) 565ab4382d2SGreg Kroah-Hartman { 566ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 567ab4382d2SGreg Kroah-Hartman struct uart_port *port; 568ab4382d2SGreg Kroah-Hartman struct circ_buf *circ; 569ab4382d2SGreg Kroah-Hartman unsigned long flags; 570ab4382d2SGreg Kroah-Hartman int c, ret = 0; 571ab4382d2SGreg Kroah-Hartman 572ab4382d2SGreg Kroah-Hartman /* 573ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 574ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 575ab4382d2SGreg Kroah-Hartman */ 576ab4382d2SGreg Kroah-Hartman if (!state) { 577ab4382d2SGreg Kroah-Hartman WARN_ON(1); 578ab4382d2SGreg Kroah-Hartman return -EL3HLT; 579ab4382d2SGreg Kroah-Hartman } 580ab4382d2SGreg Kroah-Hartman 5819ed19428SPeter Hurley port = uart_port_lock(state, flags); 582aff9cf59SSamir Virmani circ = &state->xmit; 583aff9cf59SSamir Virmani if (!circ->buf) { 584aff9cf59SSamir Virmani uart_port_unlock(port, flags); 585aff9cf59SSamir Virmani return 0; 586aff9cf59SSamir Virmani } 587aff9cf59SSamir Virmani 5889ed19428SPeter Hurley while (port) { 589ab4382d2SGreg Kroah-Hartman c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE); 590ab4382d2SGreg Kroah-Hartman if (count < c) 591ab4382d2SGreg Kroah-Hartman c = count; 592ab4382d2SGreg Kroah-Hartman if (c <= 0) 593ab4382d2SGreg Kroah-Hartman break; 594ab4382d2SGreg Kroah-Hartman memcpy(circ->buf + circ->head, buf, c); 595ab4382d2SGreg Kroah-Hartman circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1); 596ab4382d2SGreg Kroah-Hartman buf += c; 597ab4382d2SGreg Kroah-Hartman count -= c; 598ab4382d2SGreg Kroah-Hartman ret += c; 599ab4382d2SGreg Kroah-Hartman } 60064dbee31SPeter Hurley 60164dbee31SPeter Hurley __uart_start(tty); 6029ed19428SPeter Hurley uart_port_unlock(port, flags); 603ab4382d2SGreg Kroah-Hartman return ret; 604ab4382d2SGreg Kroah-Hartman } 605ab4382d2SGreg Kroah-Hartman 60603b3b1a2SJiri Slaby static unsigned int uart_write_room(struct tty_struct *tty) 607ab4382d2SGreg Kroah-Hartman { 608ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 6099ed19428SPeter Hurley struct uart_port *port; 610ab4382d2SGreg Kroah-Hartman unsigned long flags; 61103b3b1a2SJiri Slaby unsigned int ret; 612ab4382d2SGreg Kroah-Hartman 6139ed19428SPeter Hurley port = uart_port_lock(state, flags); 614ab4382d2SGreg Kroah-Hartman ret = uart_circ_chars_free(&state->xmit); 6159ed19428SPeter Hurley uart_port_unlock(port, flags); 616ab4382d2SGreg Kroah-Hartman return ret; 617ab4382d2SGreg Kroah-Hartman } 618ab4382d2SGreg Kroah-Hartman 619fff4ef17SJiri Slaby static unsigned int uart_chars_in_buffer(struct tty_struct *tty) 620ab4382d2SGreg Kroah-Hartman { 621ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 6229ed19428SPeter Hurley struct uart_port *port; 623ab4382d2SGreg Kroah-Hartman unsigned long flags; 624fff4ef17SJiri Slaby unsigned int ret; 625ab4382d2SGreg Kroah-Hartman 6269ed19428SPeter Hurley port = uart_port_lock(state, flags); 627ab4382d2SGreg Kroah-Hartman ret = uart_circ_chars_pending(&state->xmit); 6289ed19428SPeter Hurley uart_port_unlock(port, flags); 629ab4382d2SGreg Kroah-Hartman return ret; 630ab4382d2SGreg Kroah-Hartman } 631ab4382d2SGreg Kroah-Hartman 632ab4382d2SGreg Kroah-Hartman static void uart_flush_buffer(struct tty_struct *tty) 633ab4382d2SGreg Kroah-Hartman { 634ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 635ab4382d2SGreg Kroah-Hartman struct uart_port *port; 636ab4382d2SGreg Kroah-Hartman unsigned long flags; 637ab4382d2SGreg Kroah-Hartman 638ab4382d2SGreg Kroah-Hartman /* 639ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 640ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 641ab4382d2SGreg Kroah-Hartman */ 642ab4382d2SGreg Kroah-Hartman if (!state) { 643ab4382d2SGreg Kroah-Hartman WARN_ON(1); 644ab4382d2SGreg Kroah-Hartman return; 645ab4382d2SGreg Kroah-Hartman } 646ab4382d2SGreg Kroah-Hartman 647ab4382d2SGreg Kroah-Hartman pr_debug("uart_flush_buffer(%d) called\n", tty->index); 648ab4382d2SGreg Kroah-Hartman 6499ed19428SPeter Hurley port = uart_port_lock(state, flags); 6509ed19428SPeter Hurley if (!port) 6519ed19428SPeter Hurley return; 652ab4382d2SGreg Kroah-Hartman uart_circ_clear(&state->xmit); 653ab4382d2SGreg Kroah-Hartman if (port->ops->flush_buffer) 654ab4382d2SGreg Kroah-Hartman port->ops->flush_buffer(port); 6559ed19428SPeter Hurley uart_port_unlock(port, flags); 656d0f4bce2SRob Herring tty_port_tty_wakeup(&state->port); 657ab4382d2SGreg Kroah-Hartman } 658ab4382d2SGreg Kroah-Hartman 659ab4382d2SGreg Kroah-Hartman /* 660f58c252eSIlpo Järvinen * This function performs low-level write of high-priority XON/XOFF 661f58c252eSIlpo Järvinen * character and accounting for it. 662f58c252eSIlpo Järvinen * 663f58c252eSIlpo Järvinen * Requires uart_port to implement .serial_out(). 664f58c252eSIlpo Järvinen */ 665f58c252eSIlpo Järvinen void uart_xchar_out(struct uart_port *uport, int offset) 666f58c252eSIlpo Järvinen { 667f58c252eSIlpo Järvinen serial_port_out(uport, offset, uport->x_char); 668f58c252eSIlpo Järvinen uport->icount.tx++; 669f58c252eSIlpo Järvinen uport->x_char = 0; 670f58c252eSIlpo Järvinen } 671f58c252eSIlpo Järvinen EXPORT_SYMBOL_GPL(uart_xchar_out); 672f58c252eSIlpo Järvinen 673f58c252eSIlpo Järvinen /* 674ab4382d2SGreg Kroah-Hartman * This function is used to send a high-priority XON/XOFF character to 675ab4382d2SGreg Kroah-Hartman * the device 676ab4382d2SGreg Kroah-Hartman */ 677ab4382d2SGreg Kroah-Hartman static void uart_send_xchar(struct tty_struct *tty, char ch) 678ab4382d2SGreg Kroah-Hartman { 679ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 6809ed19428SPeter Hurley struct uart_port *port; 681ab4382d2SGreg Kroah-Hartman unsigned long flags; 682ab4382d2SGreg Kroah-Hartman 6839ed19428SPeter Hurley port = uart_port_ref(state); 6849ed19428SPeter Hurley if (!port) 6859ed19428SPeter Hurley return; 6869ed19428SPeter Hurley 687ab4382d2SGreg Kroah-Hartman if (port->ops->send_xchar) 688ab4382d2SGreg Kroah-Hartman port->ops->send_xchar(port, ch); 689ab4382d2SGreg Kroah-Hartman else { 690ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 691c235ccc1SPeter Hurley port->x_char = ch; 692c235ccc1SPeter Hurley if (ch) 693ab4382d2SGreg Kroah-Hartman port->ops->start_tx(port); 694ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 695ab4382d2SGreg Kroah-Hartman } 6969ed19428SPeter Hurley uart_port_deref(port); 697ab4382d2SGreg Kroah-Hartman } 698ab4382d2SGreg Kroah-Hartman 699ab4382d2SGreg Kroah-Hartman static void uart_throttle(struct tty_struct *tty) 700ab4382d2SGreg Kroah-Hartman { 701ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 702c5f78b1fSJeremy Kerr upstat_t mask = UPSTAT_SYNC_FIFO; 7039ed19428SPeter Hurley struct uart_port *port; 704ab4382d2SGreg Kroah-Hartman 7059ed19428SPeter Hurley port = uart_port_ref(state); 7069ed19428SPeter Hurley if (!port) 7079ed19428SPeter Hurley return; 7089ed19428SPeter Hurley 709ab4382d2SGreg Kroah-Hartman if (I_IXOFF(tty)) 710391f93f2SPeter Hurley mask |= UPSTAT_AUTOXOFF; 7119db276f8SPeter Hurley if (C_CRTSCTS(tty)) 712391f93f2SPeter Hurley mask |= UPSTAT_AUTORTS; 7139aba8d5bSRussell King 714391f93f2SPeter Hurley if (port->status & mask) { 7159aba8d5bSRussell King port->ops->throttle(port); 716391f93f2SPeter Hurley mask &= ~port->status; 7179aba8d5bSRussell King } 7189aba8d5bSRussell King 719391f93f2SPeter Hurley if (mask & UPSTAT_AUTORTS) 7209aba8d5bSRussell King uart_clear_mctrl(port, TIOCM_RTS); 721b4749b97SPeter Hurley 722b4749b97SPeter Hurley if (mask & UPSTAT_AUTOXOFF) 723b4749b97SPeter Hurley uart_send_xchar(tty, STOP_CHAR(tty)); 7249ed19428SPeter Hurley 7259ed19428SPeter Hurley uart_port_deref(port); 726ab4382d2SGreg Kroah-Hartman } 727ab4382d2SGreg Kroah-Hartman 728ab4382d2SGreg Kroah-Hartman static void uart_unthrottle(struct tty_struct *tty) 729ab4382d2SGreg Kroah-Hartman { 730ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 731c5f78b1fSJeremy Kerr upstat_t mask = UPSTAT_SYNC_FIFO; 7329ed19428SPeter Hurley struct uart_port *port; 733ab4382d2SGreg Kroah-Hartman 7349ed19428SPeter Hurley port = uart_port_ref(state); 7359ed19428SPeter Hurley if (!port) 7369ed19428SPeter Hurley return; 7379ed19428SPeter Hurley 7389aba8d5bSRussell King if (I_IXOFF(tty)) 739391f93f2SPeter Hurley mask |= UPSTAT_AUTOXOFF; 7409db276f8SPeter Hurley if (C_CRTSCTS(tty)) 741391f93f2SPeter Hurley mask |= UPSTAT_AUTORTS; 7429aba8d5bSRussell King 743391f93f2SPeter Hurley if (port->status & mask) { 7449aba8d5bSRussell King port->ops->unthrottle(port); 745391f93f2SPeter Hurley mask &= ~port->status; 7469aba8d5bSRussell King } 7479aba8d5bSRussell King 748391f93f2SPeter Hurley if (mask & UPSTAT_AUTORTS) 749ab4382d2SGreg Kroah-Hartman uart_set_mctrl(port, TIOCM_RTS); 750b4749b97SPeter Hurley 751b4749b97SPeter Hurley if (mask & UPSTAT_AUTOXOFF) 752b4749b97SPeter Hurley uart_send_xchar(tty, START_CHAR(tty)); 7539ed19428SPeter Hurley 7549ed19428SPeter Hurley uart_port_deref(port); 755ab4382d2SGreg Kroah-Hartman } 756ab4382d2SGreg Kroah-Hartman 7574047b371SPeter Hurley static int uart_get_info(struct tty_port *port, struct serial_struct *retinfo) 758ab4382d2SGreg Kroah-Hartman { 7599f109694SAlan Cox struct uart_state *state = container_of(port, struct uart_state, port); 7604047b371SPeter Hurley struct uart_port *uport; 7614047b371SPeter Hurley int ret = -ENODEV; 7627ba2e769SAlan Cox 7633abe8c76SPeter Hurley /* 7643abe8c76SPeter Hurley * Ensure the state we copy is consistent and no hardware changes 7653abe8c76SPeter Hurley * occur as we go 7663abe8c76SPeter Hurley */ 7673abe8c76SPeter Hurley mutex_lock(&port->mutex); 7684047b371SPeter Hurley uport = uart_port_check(state); 7694047b371SPeter Hurley if (!uport) 7704047b371SPeter Hurley goto out; 7714047b371SPeter Hurley 7727ba2e769SAlan Cox retinfo->type = uport->type; 7737ba2e769SAlan Cox retinfo->line = uport->line; 7747ba2e769SAlan Cox retinfo->port = uport->iobase; 7757ba2e769SAlan Cox if (HIGH_BITS_OFFSET) 7767ba2e769SAlan Cox retinfo->port_high = (long) uport->iobase >> HIGH_BITS_OFFSET; 7777ba2e769SAlan Cox retinfo->irq = uport->irq; 778a17e74c5SAndy Shevchenko retinfo->flags = (__force int)uport->flags; 7797ba2e769SAlan Cox retinfo->xmit_fifo_size = uport->fifosize; 7807ba2e769SAlan Cox retinfo->baud_base = uport->uartclk / 16; 7817ba2e769SAlan Cox retinfo->close_delay = jiffies_to_msecs(port->close_delay) / 10; 7827ba2e769SAlan Cox retinfo->closing_wait = port->closing_wait == ASYNC_CLOSING_WAIT_NONE ? 7837ba2e769SAlan Cox ASYNC_CLOSING_WAIT_NONE : 7847ba2e769SAlan Cox jiffies_to_msecs(port->closing_wait) / 10; 7857ba2e769SAlan Cox retinfo->custom_divisor = uport->custom_divisor; 7867ba2e769SAlan Cox retinfo->hub6 = uport->hub6; 7877ba2e769SAlan Cox retinfo->io_type = uport->iotype; 7887ba2e769SAlan Cox retinfo->iomem_reg_shift = uport->regshift; 7897ba2e769SAlan Cox retinfo->iomem_base = (void *)(unsigned long)uport->mapbase; 7904047b371SPeter Hurley 7914047b371SPeter Hurley ret = 0; 7924047b371SPeter Hurley out: 793ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 7944047b371SPeter Hurley return ret; 7959f109694SAlan Cox } 7969f109694SAlan Cox 7975099d234SAl Viro static int uart_get_info_user(struct tty_struct *tty, 7985099d234SAl Viro struct serial_struct *ss) 7999f109694SAlan Cox { 8005099d234SAl Viro struct uart_state *state = tty->driver_data; 8015099d234SAl Viro struct tty_port *port = &state->port; 8023abe8c76SPeter Hurley 8035099d234SAl Viro return uart_get_info(port, ss) < 0 ? -EIO : 0; 804ab4382d2SGreg Kroah-Hartman } 805ab4382d2SGreg Kroah-Hartman 8067ba2e769SAlan Cox static int uart_set_info(struct tty_struct *tty, struct tty_port *port, 8077ba2e769SAlan Cox struct uart_state *state, 8087ba2e769SAlan Cox struct serial_struct *new_info) 809ab4382d2SGreg Kroah-Hartman { 8104047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 811ab4382d2SGreg Kroah-Hartman unsigned long new_port; 812ab4382d2SGreg Kroah-Hartman unsigned int change_irq, change_port, closing_wait; 813ab4382d2SGreg Kroah-Hartman unsigned int old_custom_divisor, close_delay; 814ab4382d2SGreg Kroah-Hartman upf_t old_flags, new_flags; 815ab4382d2SGreg Kroah-Hartman int retval = 0; 816ab4382d2SGreg Kroah-Hartman 8174047b371SPeter Hurley if (!uport) 8184047b371SPeter Hurley return -EIO; 8194047b371SPeter Hurley 8207ba2e769SAlan Cox new_port = new_info->port; 821ab4382d2SGreg Kroah-Hartman if (HIGH_BITS_OFFSET) 8227ba2e769SAlan Cox new_port += (unsigned long) new_info->port_high << HIGH_BITS_OFFSET; 823ab4382d2SGreg Kroah-Hartman 8247ba2e769SAlan Cox new_info->irq = irq_canonicalize(new_info->irq); 8257ba2e769SAlan Cox close_delay = msecs_to_jiffies(new_info->close_delay * 10); 8267ba2e769SAlan Cox closing_wait = new_info->closing_wait == ASYNC_CLOSING_WAIT_NONE ? 8274cb0fbfdSJiri Slaby ASYNC_CLOSING_WAIT_NONE : 8287ba2e769SAlan Cox msecs_to_jiffies(new_info->closing_wait * 10); 829ab4382d2SGreg Kroah-Hartman 830ab4382d2SGreg Kroah-Hartman 831ab4382d2SGreg Kroah-Hartman change_irq = !(uport->flags & UPF_FIXED_PORT) 8327ba2e769SAlan Cox && new_info->irq != uport->irq; 833ab4382d2SGreg Kroah-Hartman 834ab4382d2SGreg Kroah-Hartman /* 835ab4382d2SGreg Kroah-Hartman * Since changing the 'type' of the port changes its resource 836ab4382d2SGreg Kroah-Hartman * allocations, we should treat type changes the same as 837ab4382d2SGreg Kroah-Hartman * IO port changes. 838ab4382d2SGreg Kroah-Hartman */ 839ab4382d2SGreg Kroah-Hartman change_port = !(uport->flags & UPF_FIXED_PORT) 840ab4382d2SGreg Kroah-Hartman && (new_port != uport->iobase || 8417ba2e769SAlan Cox (unsigned long)new_info->iomem_base != uport->mapbase || 8427ba2e769SAlan Cox new_info->hub6 != uport->hub6 || 8437ba2e769SAlan Cox new_info->io_type != uport->iotype || 8447ba2e769SAlan Cox new_info->iomem_reg_shift != uport->regshift || 8457ba2e769SAlan Cox new_info->type != uport->type); 846ab4382d2SGreg Kroah-Hartman 847ab4382d2SGreg Kroah-Hartman old_flags = uport->flags; 848a17e74c5SAndy Shevchenko new_flags = (__force upf_t)new_info->flags; 849ab4382d2SGreg Kroah-Hartman old_custom_divisor = uport->custom_divisor; 850ab4382d2SGreg Kroah-Hartman 851ab4382d2SGreg Kroah-Hartman if (!capable(CAP_SYS_ADMIN)) { 852ab4382d2SGreg Kroah-Hartman retval = -EPERM; 853ab4382d2SGreg Kroah-Hartman if (change_irq || change_port || 8547ba2e769SAlan Cox (new_info->baud_base != uport->uartclk / 16) || 855ab4382d2SGreg Kroah-Hartman (close_delay != port->close_delay) || 856ab4382d2SGreg Kroah-Hartman (closing_wait != port->closing_wait) || 8577ba2e769SAlan Cox (new_info->xmit_fifo_size && 8587ba2e769SAlan Cox new_info->xmit_fifo_size != uport->fifosize) || 859ab4382d2SGreg Kroah-Hartman (((new_flags ^ old_flags) & ~UPF_USR_MASK) != 0)) 860ab4382d2SGreg Kroah-Hartman goto exit; 861ab4382d2SGreg Kroah-Hartman uport->flags = ((uport->flags & ~UPF_USR_MASK) | 862ab4382d2SGreg Kroah-Hartman (new_flags & UPF_USR_MASK)); 8637ba2e769SAlan Cox uport->custom_divisor = new_info->custom_divisor; 864ab4382d2SGreg Kroah-Hartman goto check_and_exit; 865ab4382d2SGreg Kroah-Hartman } 866ab4382d2SGreg Kroah-Hartman 8675e722b21SOndrej Mosnacek if (change_irq || change_port) { 868794edf30SDavid Howells retval = security_locked_down(LOCKDOWN_TIOCSSERIAL); 8695e722b21SOndrej Mosnacek if (retval) 870794edf30SDavid Howells goto exit; 8715e722b21SOndrej Mosnacek } 872794edf30SDavid Howells 873ab4382d2SGreg Kroah-Hartman /* 874ab4382d2SGreg Kroah-Hartman * Ask the low level driver to verify the settings. 875ab4382d2SGreg Kroah-Hartman */ 876ab4382d2SGreg Kroah-Hartman if (uport->ops->verify_port) 8777ba2e769SAlan Cox retval = uport->ops->verify_port(uport, new_info); 878ab4382d2SGreg Kroah-Hartman 8797ba2e769SAlan Cox if ((new_info->irq >= nr_irqs) || (new_info->irq < 0) || 8807ba2e769SAlan Cox (new_info->baud_base < 9600)) 881ab4382d2SGreg Kroah-Hartman retval = -EINVAL; 882ab4382d2SGreg Kroah-Hartman 883ab4382d2SGreg Kroah-Hartman if (retval) 884ab4382d2SGreg Kroah-Hartman goto exit; 885ab4382d2SGreg Kroah-Hartman 886ab4382d2SGreg Kroah-Hartman if (change_port || change_irq) { 887ab4382d2SGreg Kroah-Hartman retval = -EBUSY; 888ab4382d2SGreg Kroah-Hartman 889ab4382d2SGreg Kroah-Hartman /* 890ab4382d2SGreg Kroah-Hartman * Make sure that we are the sole user of this port. 891ab4382d2SGreg Kroah-Hartman */ 892ab4382d2SGreg Kroah-Hartman if (tty_port_users(port) > 1) 893ab4382d2SGreg Kroah-Hartman goto exit; 894ab4382d2SGreg Kroah-Hartman 895ab4382d2SGreg Kroah-Hartman /* 896ab4382d2SGreg Kroah-Hartman * We need to shutdown the serial port at the old 897ab4382d2SGreg Kroah-Hartman * port/type/irq combination. 898ab4382d2SGreg Kroah-Hartman */ 899ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 900ab4382d2SGreg Kroah-Hartman } 901ab4382d2SGreg Kroah-Hartman 902ab4382d2SGreg Kroah-Hartman if (change_port) { 903ab4382d2SGreg Kroah-Hartman unsigned long old_iobase, old_mapbase; 904ab4382d2SGreg Kroah-Hartman unsigned int old_type, old_iotype, old_hub6, old_shift; 905ab4382d2SGreg Kroah-Hartman 906ab4382d2SGreg Kroah-Hartman old_iobase = uport->iobase; 907ab4382d2SGreg Kroah-Hartman old_mapbase = uport->mapbase; 908ab4382d2SGreg Kroah-Hartman old_type = uport->type; 909ab4382d2SGreg Kroah-Hartman old_hub6 = uport->hub6; 910ab4382d2SGreg Kroah-Hartman old_iotype = uport->iotype; 911ab4382d2SGreg Kroah-Hartman old_shift = uport->regshift; 912ab4382d2SGreg Kroah-Hartman 913ab4382d2SGreg Kroah-Hartman /* 914ab4382d2SGreg Kroah-Hartman * Free and release old regions 915ab4382d2SGreg Kroah-Hartman */ 916a7cfaf16SFabio Estevam if (old_type != PORT_UNKNOWN && uport->ops->release_port) 917ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 918ab4382d2SGreg Kroah-Hartman 919ab4382d2SGreg Kroah-Hartman uport->iobase = new_port; 9207ba2e769SAlan Cox uport->type = new_info->type; 9217ba2e769SAlan Cox uport->hub6 = new_info->hub6; 9227ba2e769SAlan Cox uport->iotype = new_info->io_type; 9237ba2e769SAlan Cox uport->regshift = new_info->iomem_reg_shift; 9247ba2e769SAlan Cox uport->mapbase = (unsigned long)new_info->iomem_base; 925ab4382d2SGreg Kroah-Hartman 926ab4382d2SGreg Kroah-Hartman /* 927ab4382d2SGreg Kroah-Hartman * Claim and map the new regions 928ab4382d2SGreg Kroah-Hartman */ 929a7cfaf16SFabio Estevam if (uport->type != PORT_UNKNOWN && uport->ops->request_port) { 930ab4382d2SGreg Kroah-Hartman retval = uport->ops->request_port(uport); 931ab4382d2SGreg Kroah-Hartman } else { 932ab4382d2SGreg Kroah-Hartman /* Always success - Jean II */ 933ab4382d2SGreg Kroah-Hartman retval = 0; 934ab4382d2SGreg Kroah-Hartman } 935ab4382d2SGreg Kroah-Hartman 936ab4382d2SGreg Kroah-Hartman /* 937ab4382d2SGreg Kroah-Hartman * If we fail to request resources for the 938ab4382d2SGreg Kroah-Hartman * new port, try to restore the old settings. 939ab4382d2SGreg Kroah-Hartman */ 9407deb39edSThomas Pfaff if (retval) { 941ab4382d2SGreg Kroah-Hartman uport->iobase = old_iobase; 942ab4382d2SGreg Kroah-Hartman uport->type = old_type; 943ab4382d2SGreg Kroah-Hartman uport->hub6 = old_hub6; 944ab4382d2SGreg Kroah-Hartman uport->iotype = old_iotype; 945ab4382d2SGreg Kroah-Hartman uport->regshift = old_shift; 946ab4382d2SGreg Kroah-Hartman uport->mapbase = old_mapbase; 9477deb39edSThomas Pfaff 9487deb39edSThomas Pfaff if (old_type != PORT_UNKNOWN) { 949ab4382d2SGreg Kroah-Hartman retval = uport->ops->request_port(uport); 950ab4382d2SGreg Kroah-Hartman /* 951ab4382d2SGreg Kroah-Hartman * If we failed to restore the old settings, 952ab4382d2SGreg Kroah-Hartman * we fail like this. 953ab4382d2SGreg Kroah-Hartman */ 954ab4382d2SGreg Kroah-Hartman if (retval) 955ab4382d2SGreg Kroah-Hartman uport->type = PORT_UNKNOWN; 956ab4382d2SGreg Kroah-Hartman 957ab4382d2SGreg Kroah-Hartman /* 958ab4382d2SGreg Kroah-Hartman * We failed anyway. 959ab4382d2SGreg Kroah-Hartman */ 960ab4382d2SGreg Kroah-Hartman retval = -EBUSY; 9617deb39edSThomas Pfaff } 9627deb39edSThomas Pfaff 963ab4382d2SGreg Kroah-Hartman /* Added to return the correct error -Ram Gupta */ 964ab4382d2SGreg Kroah-Hartman goto exit; 965ab4382d2SGreg Kroah-Hartman } 966ab4382d2SGreg Kroah-Hartman } 967ab4382d2SGreg Kroah-Hartman 968ab4382d2SGreg Kroah-Hartman if (change_irq) 9697ba2e769SAlan Cox uport->irq = new_info->irq; 970ab4382d2SGreg Kroah-Hartman if (!(uport->flags & UPF_FIXED_PORT)) 9717ba2e769SAlan Cox uport->uartclk = new_info->baud_base * 16; 972ab4382d2SGreg Kroah-Hartman uport->flags = (uport->flags & ~UPF_CHANGE_MASK) | 973ab4382d2SGreg Kroah-Hartman (new_flags & UPF_CHANGE_MASK); 9747ba2e769SAlan Cox uport->custom_divisor = new_info->custom_divisor; 975ab4382d2SGreg Kroah-Hartman port->close_delay = close_delay; 976ab4382d2SGreg Kroah-Hartman port->closing_wait = closing_wait; 9777ba2e769SAlan Cox if (new_info->xmit_fifo_size) 9787ba2e769SAlan Cox uport->fifosize = new_info->xmit_fifo_size; 979ab4382d2SGreg Kroah-Hartman 980ab4382d2SGreg Kroah-Hartman check_and_exit: 981ab4382d2SGreg Kroah-Hartman retval = 0; 982ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) 983ab4382d2SGreg Kroah-Hartman goto exit; 984d41861caSPeter Hurley if (tty_port_initialized(port)) { 985ab4382d2SGreg Kroah-Hartman if (((old_flags ^ uport->flags) & UPF_SPD_MASK) || 986ab4382d2SGreg Kroah-Hartman old_custom_divisor != uport->custom_divisor) { 987ab4382d2SGreg Kroah-Hartman /* 988ab4382d2SGreg Kroah-Hartman * If they're setting up a custom divisor or speed, 989dc2f7271SJohan Hovold * instead of clearing it, then bitch about it. 990ab4382d2SGreg Kroah-Hartman */ 991ab4382d2SGreg Kroah-Hartman if (uport->flags & UPF_SPD_MASK) { 992dc2f7271SJohan Hovold dev_notice_ratelimited(uport->dev, 9932f2dafe7SSudip Mukherjee "%s sets custom speed on %s. This is deprecated.\n", 9942f2dafe7SSudip Mukherjee current->comm, 995429b4749SRasmus Villemoes tty_name(port->tty)); 996ab4382d2SGreg Kroah-Hartman } 997ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 998ab4382d2SGreg Kroah-Hartman } 999b3b57646SRob Herring } else { 1000dcd794c6SIlpo Järvinen retval = uart_startup(tty, state, true); 100144117a1dSSebastian Andrzej Siewior if (retval == 0) 100244117a1dSSebastian Andrzej Siewior tty_port_set_initialized(port, true); 1003b3b57646SRob Herring if (retval > 0) 1004b3b57646SRob Herring retval = 0; 1005b3b57646SRob Herring } 1006ab4382d2SGreg Kroah-Hartman exit: 10077ba2e769SAlan Cox return retval; 10087ba2e769SAlan Cox } 10097ba2e769SAlan Cox 10105099d234SAl Viro static int uart_set_info_user(struct tty_struct *tty, struct serial_struct *ss) 10117ba2e769SAlan Cox { 10125099d234SAl Viro struct uart_state *state = tty->driver_data; 10137ba2e769SAlan Cox struct tty_port *port = &state->port; 10147ba2e769SAlan Cox int retval; 10157ba2e769SAlan Cox 10165099d234SAl Viro down_write(&tty->termios_rwsem); 10177ba2e769SAlan Cox /* 10187ba2e769SAlan Cox * This semaphore protects port->count. It is also 10197ba2e769SAlan Cox * very useful to prevent opens. Also, take the 10207ba2e769SAlan Cox * port configuration semaphore to make sure that a 10217ba2e769SAlan Cox * module insertion/removal doesn't change anything 10227ba2e769SAlan Cox * under us. 10237ba2e769SAlan Cox */ 10247ba2e769SAlan Cox mutex_lock(&port->mutex); 10255099d234SAl Viro retval = uart_set_info(tty, port, state, ss); 1026ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 10275099d234SAl Viro up_write(&tty->termios_rwsem); 1028ab4382d2SGreg Kroah-Hartman return retval; 1029ab4382d2SGreg Kroah-Hartman } 1030ab4382d2SGreg Kroah-Hartman 1031ab4382d2SGreg Kroah-Hartman /** 1032ab4382d2SGreg Kroah-Hartman * uart_get_lsr_info - get line status register info 1033ab4382d2SGreg Kroah-Hartman * @tty: tty associated with the UART 1034ab4382d2SGreg Kroah-Hartman * @state: UART being queried 1035ab4382d2SGreg Kroah-Hartman * @value: returned modem value 1036ab4382d2SGreg Kroah-Hartman */ 1037ab4382d2SGreg Kroah-Hartman static int uart_get_lsr_info(struct tty_struct *tty, 1038ab4382d2SGreg Kroah-Hartman struct uart_state *state, unsigned int __user *value) 1039ab4382d2SGreg Kroah-Hartman { 10404047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 1041ab4382d2SGreg Kroah-Hartman unsigned int result; 1042ab4382d2SGreg Kroah-Hartman 1043ab4382d2SGreg Kroah-Hartman result = uport->ops->tx_empty(uport); 1044ab4382d2SGreg Kroah-Hartman 1045ab4382d2SGreg Kroah-Hartman /* 1046ab4382d2SGreg Kroah-Hartman * If we're about to load something into the transmit 1047ab4382d2SGreg Kroah-Hartman * register, we'll pretend the transmitter isn't empty to 1048ab4382d2SGreg Kroah-Hartman * avoid a race condition (depending on when the transmit 1049ab4382d2SGreg Kroah-Hartman * interrupt happens). 1050ab4382d2SGreg Kroah-Hartman */ 1051ab4382d2SGreg Kroah-Hartman if (uport->x_char || 1052ab4382d2SGreg Kroah-Hartman ((uart_circ_chars_pending(&state->xmit) > 0) && 1053d01f4d18SPeter Hurley !uart_tx_stopped(uport))) 1054ab4382d2SGreg Kroah-Hartman result &= ~TIOCSER_TEMT; 1055ab4382d2SGreg Kroah-Hartman 1056ab4382d2SGreg Kroah-Hartman return put_user(result, value); 1057ab4382d2SGreg Kroah-Hartman } 1058ab4382d2SGreg Kroah-Hartman 105960b33c13SAlan Cox static int uart_tiocmget(struct tty_struct *tty) 1060ab4382d2SGreg Kroah-Hartman { 1061ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1062ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 10634047b371SPeter Hurley struct uart_port *uport; 1064ab4382d2SGreg Kroah-Hartman int result = -EIO; 1065ab4382d2SGreg Kroah-Hartman 1066ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 10674047b371SPeter Hurley uport = uart_port_check(state); 10684047b371SPeter Hurley if (!uport) 10694047b371SPeter Hurley goto out; 10704047b371SPeter Hurley 107118900ca6SPeter Hurley if (!tty_io_error(tty)) { 1072ab4382d2SGreg Kroah-Hartman result = uport->mctrl; 1073ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1074ab4382d2SGreg Kroah-Hartman result |= uport->ops->get_mctrl(uport); 1075ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1076ab4382d2SGreg Kroah-Hartman } 10774047b371SPeter Hurley out: 1078ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1079ab4382d2SGreg Kroah-Hartman return result; 1080ab4382d2SGreg Kroah-Hartman } 1081ab4382d2SGreg Kroah-Hartman 1082ab4382d2SGreg Kroah-Hartman static int 108320b9d177SAlan Cox uart_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear) 1084ab4382d2SGreg Kroah-Hartman { 1085ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1086ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 10874047b371SPeter Hurley struct uart_port *uport; 1088ab4382d2SGreg Kroah-Hartman int ret = -EIO; 1089ab4382d2SGreg Kroah-Hartman 1090ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 10914047b371SPeter Hurley uport = uart_port_check(state); 10924047b371SPeter Hurley if (!uport) 10934047b371SPeter Hurley goto out; 10944047b371SPeter Hurley 109518900ca6SPeter Hurley if (!tty_io_error(tty)) { 1096ab4382d2SGreg Kroah-Hartman uart_update_mctrl(uport, set, clear); 1097ab4382d2SGreg Kroah-Hartman ret = 0; 1098ab4382d2SGreg Kroah-Hartman } 10994047b371SPeter Hurley out: 1100ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1101ab4382d2SGreg Kroah-Hartman return ret; 1102ab4382d2SGreg Kroah-Hartman } 1103ab4382d2SGreg Kroah-Hartman 1104ab4382d2SGreg Kroah-Hartman static int uart_break_ctl(struct tty_struct *tty, int break_state) 1105ab4382d2SGreg Kroah-Hartman { 1106ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1107ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 11084047b371SPeter Hurley struct uart_port *uport; 11094047b371SPeter Hurley int ret = -EIO; 1110ab4382d2SGreg Kroah-Hartman 1111ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 11124047b371SPeter Hurley uport = uart_port_check(state); 11134047b371SPeter Hurley if (!uport) 11144047b371SPeter Hurley goto out; 1115ab4382d2SGreg Kroah-Hartman 11167d73170eSJiangfeng Xiao if (uport->type != PORT_UNKNOWN && uport->ops->break_ctl) 1117ab4382d2SGreg Kroah-Hartman uport->ops->break_ctl(uport, break_state); 11184047b371SPeter Hurley ret = 0; 11194047b371SPeter Hurley out: 1120ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 11214047b371SPeter Hurley return ret; 1122ab4382d2SGreg Kroah-Hartman } 1123ab4382d2SGreg Kroah-Hartman 1124ab4382d2SGreg Kroah-Hartman static int uart_do_autoconfig(struct tty_struct *tty, struct uart_state *state) 1125ab4382d2SGreg Kroah-Hartman { 1126ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 11274047b371SPeter Hurley struct uart_port *uport; 1128ab4382d2SGreg Kroah-Hartman int flags, ret; 1129ab4382d2SGreg Kroah-Hartman 1130ab4382d2SGreg Kroah-Hartman if (!capable(CAP_SYS_ADMIN)) 1131ab4382d2SGreg Kroah-Hartman return -EPERM; 1132ab4382d2SGreg Kroah-Hartman 1133ab4382d2SGreg Kroah-Hartman /* 1134ab4382d2SGreg Kroah-Hartman * Take the per-port semaphore. This prevents count from 1135ab4382d2SGreg Kroah-Hartman * changing, and hence any extra opens of the port while 1136ab4382d2SGreg Kroah-Hartman * we're auto-configuring. 1137ab4382d2SGreg Kroah-Hartman */ 1138ab4382d2SGreg Kroah-Hartman if (mutex_lock_interruptible(&port->mutex)) 1139ab4382d2SGreg Kroah-Hartman return -ERESTARTSYS; 1140ab4382d2SGreg Kroah-Hartman 11414047b371SPeter Hurley uport = uart_port_check(state); 11424047b371SPeter Hurley if (!uport) { 11434047b371SPeter Hurley ret = -EIO; 11444047b371SPeter Hurley goto out; 11454047b371SPeter Hurley } 11464047b371SPeter Hurley 1147ab4382d2SGreg Kroah-Hartman ret = -EBUSY; 1148ab4382d2SGreg Kroah-Hartman if (tty_port_users(port) == 1) { 1149ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 1150ab4382d2SGreg Kroah-Hartman 1151ab4382d2SGreg Kroah-Hartman /* 1152ab4382d2SGreg Kroah-Hartman * If we already have a port type configured, 1153ab4382d2SGreg Kroah-Hartman * we must release its resources. 1154ab4382d2SGreg Kroah-Hartman */ 1155a7cfaf16SFabio Estevam if (uport->type != PORT_UNKNOWN && uport->ops->release_port) 1156ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 1157ab4382d2SGreg Kroah-Hartman 1158ab4382d2SGreg Kroah-Hartman flags = UART_CONFIG_TYPE; 1159ab4382d2SGreg Kroah-Hartman if (uport->flags & UPF_AUTO_IRQ) 1160ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_IRQ; 1161ab4382d2SGreg Kroah-Hartman 1162ab4382d2SGreg Kroah-Hartman /* 1163ab4382d2SGreg Kroah-Hartman * This will claim the ports resources if 1164ab4382d2SGreg Kroah-Hartman * a port is found. 1165ab4382d2SGreg Kroah-Hartman */ 1166ab4382d2SGreg Kroah-Hartman uport->ops->config_port(uport, flags); 1167ab4382d2SGreg Kroah-Hartman 1168dcd794c6SIlpo Järvinen ret = uart_startup(tty, state, true); 116971456906SSebastian Andrzej Siewior if (ret == 0) 117071456906SSebastian Andrzej Siewior tty_port_set_initialized(port, true); 1171b3b57646SRob Herring if (ret > 0) 1172b3b57646SRob Herring ret = 0; 1173ab4382d2SGreg Kroah-Hartman } 11744047b371SPeter Hurley out: 1175ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1176ab4382d2SGreg Kroah-Hartman return ret; 1177ab4382d2SGreg Kroah-Hartman } 1178ab4382d2SGreg Kroah-Hartman 11791fdc3106SAlexander Shiyan static void uart_enable_ms(struct uart_port *uport) 11801fdc3106SAlexander Shiyan { 11811fdc3106SAlexander Shiyan /* 11821fdc3106SAlexander Shiyan * Force modem status interrupts on 11831fdc3106SAlexander Shiyan */ 11841fdc3106SAlexander Shiyan if (uport->ops->enable_ms) 11851fdc3106SAlexander Shiyan uport->ops->enable_ms(uport); 11861fdc3106SAlexander Shiyan } 11871fdc3106SAlexander Shiyan 1188ab4382d2SGreg Kroah-Hartman /* 1189ab4382d2SGreg Kroah-Hartman * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change 1190ab4382d2SGreg Kroah-Hartman * - mask passed in arg for lines of interest 1191ab4382d2SGreg Kroah-Hartman * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) 1192ab4382d2SGreg Kroah-Hartman * Caller should use TIOCGICOUNT to see which one it was 1193ab4382d2SGreg Kroah-Hartman * 1194ab4382d2SGreg Kroah-Hartman * FIXME: This wants extracting into a common all driver implementation 1195ab4382d2SGreg Kroah-Hartman * of TIOCMWAIT using tty_port. 1196ab4382d2SGreg Kroah-Hartman */ 11979ed19428SPeter Hurley static int uart_wait_modem_status(struct uart_state *state, unsigned long arg) 1198ab4382d2SGreg Kroah-Hartman { 11999ed19428SPeter Hurley struct uart_port *uport; 1200ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1201ab4382d2SGreg Kroah-Hartman DECLARE_WAITQUEUE(wait, current); 1202ab4382d2SGreg Kroah-Hartman struct uart_icount cprev, cnow; 1203ab4382d2SGreg Kroah-Hartman int ret; 1204ab4382d2SGreg Kroah-Hartman 1205ab4382d2SGreg Kroah-Hartman /* 1206ab4382d2SGreg Kroah-Hartman * note the counters on entry 1207ab4382d2SGreg Kroah-Hartman */ 12089ed19428SPeter Hurley uport = uart_port_ref(state); 12099ed19428SPeter Hurley if (!uport) 12109ed19428SPeter Hurley return -EIO; 1211ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1212ab4382d2SGreg Kroah-Hartman memcpy(&cprev, &uport->icount, sizeof(struct uart_icount)); 12131fdc3106SAlexander Shiyan uart_enable_ms(uport); 1214ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1215ab4382d2SGreg Kroah-Hartman 1216ab4382d2SGreg Kroah-Hartman add_wait_queue(&port->delta_msr_wait, &wait); 1217ab4382d2SGreg Kroah-Hartman for (;;) { 1218ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1219ab4382d2SGreg Kroah-Hartman memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); 1220ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1221ab4382d2SGreg Kroah-Hartman 1222ab4382d2SGreg Kroah-Hartman set_current_state(TASK_INTERRUPTIBLE); 1223ab4382d2SGreg Kroah-Hartman 1224ab4382d2SGreg Kroah-Hartman if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || 1225ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || 1226ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || 1227ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) { 1228ab4382d2SGreg Kroah-Hartman ret = 0; 1229ab4382d2SGreg Kroah-Hartman break; 1230ab4382d2SGreg Kroah-Hartman } 1231ab4382d2SGreg Kroah-Hartman 1232ab4382d2SGreg Kroah-Hartman schedule(); 1233ab4382d2SGreg Kroah-Hartman 1234ab4382d2SGreg Kroah-Hartman /* see if a signal did it */ 1235ab4382d2SGreg Kroah-Hartman if (signal_pending(current)) { 1236ab4382d2SGreg Kroah-Hartman ret = -ERESTARTSYS; 1237ab4382d2SGreg Kroah-Hartman break; 1238ab4382d2SGreg Kroah-Hartman } 1239ab4382d2SGreg Kroah-Hartman 1240ab4382d2SGreg Kroah-Hartman cprev = cnow; 1241ab4382d2SGreg Kroah-Hartman } 124297f9f707SFabian Frederick __set_current_state(TASK_RUNNING); 1243ab4382d2SGreg Kroah-Hartman remove_wait_queue(&port->delta_msr_wait, &wait); 12449ed19428SPeter Hurley uart_port_deref(uport); 1245ab4382d2SGreg Kroah-Hartman 1246ab4382d2SGreg Kroah-Hartman return ret; 1247ab4382d2SGreg Kroah-Hartman } 1248ab4382d2SGreg Kroah-Hartman 1249ab4382d2SGreg Kroah-Hartman /* 1250ab4382d2SGreg Kroah-Hartman * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) 1251ab4382d2SGreg Kroah-Hartman * Return: write counters to the user passed counter struct 1252ab4382d2SGreg Kroah-Hartman * NB: both 1->0 and 0->1 transitions are counted except for 1253ab4382d2SGreg Kroah-Hartman * RI where only 0->1 is counted. 1254ab4382d2SGreg Kroah-Hartman */ 1255ab4382d2SGreg Kroah-Hartman static int uart_get_icount(struct tty_struct *tty, 1256ab4382d2SGreg Kroah-Hartman struct serial_icounter_struct *icount) 1257ab4382d2SGreg Kroah-Hartman { 1258ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1259ab4382d2SGreg Kroah-Hartman struct uart_icount cnow; 12609ed19428SPeter Hurley struct uart_port *uport; 1261ab4382d2SGreg Kroah-Hartman 12629ed19428SPeter Hurley uport = uart_port_ref(state); 12639ed19428SPeter Hurley if (!uport) 12649ed19428SPeter Hurley return -EIO; 1265ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1266ab4382d2SGreg Kroah-Hartman memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); 1267ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 12689ed19428SPeter Hurley uart_port_deref(uport); 1269ab4382d2SGreg Kroah-Hartman 1270ab4382d2SGreg Kroah-Hartman icount->cts = cnow.cts; 1271ab4382d2SGreg Kroah-Hartman icount->dsr = cnow.dsr; 1272ab4382d2SGreg Kroah-Hartman icount->rng = cnow.rng; 1273ab4382d2SGreg Kroah-Hartman icount->dcd = cnow.dcd; 1274ab4382d2SGreg Kroah-Hartman icount->rx = cnow.rx; 1275ab4382d2SGreg Kroah-Hartman icount->tx = cnow.tx; 1276ab4382d2SGreg Kroah-Hartman icount->frame = cnow.frame; 1277ab4382d2SGreg Kroah-Hartman icount->overrun = cnow.overrun; 1278ab4382d2SGreg Kroah-Hartman icount->parity = cnow.parity; 1279ab4382d2SGreg Kroah-Hartman icount->brk = cnow.brk; 1280ab4382d2SGreg Kroah-Hartman icount->buf_overrun = cnow.buf_overrun; 1281ab4382d2SGreg Kroah-Hartman 1282ab4382d2SGreg Kroah-Hartman return 0; 1283ab4382d2SGreg Kroah-Hartman } 1284ab4382d2SGreg Kroah-Hartman 128551ad36baSIlpo Järvinen #define SER_RS485_LEGACY_FLAGS (SER_RS485_ENABLED | SER_RS485_RTS_ON_SEND | \ 128651ad36baSIlpo Järvinen SER_RS485_RTS_AFTER_SEND | SER_RS485_RX_DURING_TX | \ 128751ad36baSIlpo Järvinen SER_RS485_TERMINATE_BUS) 128851ad36baSIlpo Järvinen 128951ad36baSIlpo Järvinen static int uart_check_rs485_flags(struct uart_port *port, struct serial_rs485 *rs485) 129051ad36baSIlpo Järvinen { 129151ad36baSIlpo Järvinen u32 flags = rs485->flags; 129251ad36baSIlpo Järvinen 129351ad36baSIlpo Järvinen /* Don't return -EINVAL for unsupported legacy flags */ 129451ad36baSIlpo Järvinen flags &= ~SER_RS485_LEGACY_FLAGS; 129551ad36baSIlpo Järvinen 129651ad36baSIlpo Järvinen /* 129751ad36baSIlpo Järvinen * For any bit outside of the legacy ones that is not supported by 129851ad36baSIlpo Järvinen * the driver, return -EINVAL. 129951ad36baSIlpo Järvinen */ 13000139da50SIlpo Järvinen if (flags & ~port->rs485_supported.flags) 130151ad36baSIlpo Järvinen return -EINVAL; 130251ad36baSIlpo Järvinen 13034f768e94SIlpo Järvinen /* Asking for address w/o addressing mode? */ 13044f768e94SIlpo Järvinen if (!(rs485->flags & SER_RS485_ADDRB) && 13054f768e94SIlpo Järvinen (rs485->flags & (SER_RS485_ADDR_RECV|SER_RS485_ADDR_DEST))) 13064f768e94SIlpo Järvinen return -EINVAL; 13074f768e94SIlpo Järvinen 13084f768e94SIlpo Järvinen /* Address given but not enabled? */ 13094f768e94SIlpo Järvinen if (!(rs485->flags & SER_RS485_ADDR_RECV) && rs485->addr_recv) 13104f768e94SIlpo Järvinen return -EINVAL; 13114f768e94SIlpo Järvinen if (!(rs485->flags & SER_RS485_ADDR_DEST) && rs485->addr_dest) 13124f768e94SIlpo Järvinen return -EINVAL; 13134f768e94SIlpo Järvinen 131451ad36baSIlpo Järvinen return 0; 131551ad36baSIlpo Järvinen } 131651ad36baSIlpo Järvinen 1317d8fcd9cfSLino Sanfilippo static void uart_sanitize_serial_rs485_delays(struct uart_port *port, 1318d8fcd9cfSLino Sanfilippo struct serial_rs485 *rs485) 13192dbd0c14SIlpo Järvinen { 13200139da50SIlpo Järvinen if (!port->rs485_supported.delay_rts_before_send) { 1321be2e2cb1SIlpo Järvinen if (rs485->delay_rts_before_send) { 1322be2e2cb1SIlpo Järvinen dev_warn_ratelimited(port->dev, 1323be2e2cb1SIlpo Järvinen "%s (%d): RTS delay before sending not supported\n", 1324be2e2cb1SIlpo Järvinen port->name, port->line); 1325be2e2cb1SIlpo Järvinen } 1326be2e2cb1SIlpo Järvinen rs485->delay_rts_before_send = 0; 1327be2e2cb1SIlpo Järvinen } else if (rs485->delay_rts_before_send > RS485_MAX_RTS_DELAY) { 13282dbd0c14SIlpo Järvinen rs485->delay_rts_before_send = RS485_MAX_RTS_DELAY; 13292dbd0c14SIlpo Järvinen dev_warn_ratelimited(port->dev, 13302dbd0c14SIlpo Järvinen "%s (%d): RTS delay before sending clamped to %u ms\n", 13312dbd0c14SIlpo Järvinen port->name, port->line, rs485->delay_rts_before_send); 13322dbd0c14SIlpo Järvinen } 13332dbd0c14SIlpo Järvinen 13340139da50SIlpo Järvinen if (!port->rs485_supported.delay_rts_after_send) { 1335be2e2cb1SIlpo Järvinen if (rs485->delay_rts_after_send) { 1336be2e2cb1SIlpo Järvinen dev_warn_ratelimited(port->dev, 1337be2e2cb1SIlpo Järvinen "%s (%d): RTS delay after sending not supported\n", 1338be2e2cb1SIlpo Järvinen port->name, port->line); 1339be2e2cb1SIlpo Järvinen } 1340be2e2cb1SIlpo Järvinen rs485->delay_rts_after_send = 0; 1341be2e2cb1SIlpo Järvinen } else if (rs485->delay_rts_after_send > RS485_MAX_RTS_DELAY) { 13422dbd0c14SIlpo Järvinen rs485->delay_rts_after_send = RS485_MAX_RTS_DELAY; 13432dbd0c14SIlpo Järvinen dev_warn_ratelimited(port->dev, 13442dbd0c14SIlpo Järvinen "%s (%d): RTS delay after sending clamped to %u ms\n", 13452dbd0c14SIlpo Järvinen port->name, port->line, rs485->delay_rts_after_send); 13462dbd0c14SIlpo Järvinen } 1347d8fcd9cfSLino Sanfilippo } 1348d8fcd9cfSLino Sanfilippo 1349d8fcd9cfSLino Sanfilippo static void uart_sanitize_serial_rs485(struct uart_port *port, struct serial_rs485 *rs485) 1350d8fcd9cfSLino Sanfilippo { 1351d8fcd9cfSLino Sanfilippo u32 supported_flags = port->rs485_supported.flags; 1352d8fcd9cfSLino Sanfilippo 1353d8fcd9cfSLino Sanfilippo if (!(rs485->flags & SER_RS485_ENABLED)) { 1354d8fcd9cfSLino Sanfilippo memset(rs485, 0, sizeof(*rs485)); 1355d8fcd9cfSLino Sanfilippo return; 1356d8fcd9cfSLino Sanfilippo } 1357d8fcd9cfSLino Sanfilippo 1358d8fcd9cfSLino Sanfilippo /* Pick sane settings if the user hasn't */ 1359d8fcd9cfSLino Sanfilippo if ((supported_flags & (SER_RS485_RTS_ON_SEND|SER_RS485_RTS_AFTER_SEND)) && 1360d8fcd9cfSLino Sanfilippo !(rs485->flags & SER_RS485_RTS_ON_SEND) == 1361d8fcd9cfSLino Sanfilippo !(rs485->flags & SER_RS485_RTS_AFTER_SEND)) { 1362d8fcd9cfSLino Sanfilippo dev_warn_ratelimited(port->dev, 1363d8fcd9cfSLino Sanfilippo "%s (%d): invalid RTS setting, using RTS_ON_SEND instead\n", 1364d8fcd9cfSLino Sanfilippo port->name, port->line); 1365d8fcd9cfSLino Sanfilippo rs485->flags |= SER_RS485_RTS_ON_SEND; 1366d8fcd9cfSLino Sanfilippo rs485->flags &= ~SER_RS485_RTS_AFTER_SEND; 1367d8fcd9cfSLino Sanfilippo supported_flags |= SER_RS485_RTS_ON_SEND|SER_RS485_RTS_AFTER_SEND; 1368d8fcd9cfSLino Sanfilippo } 1369be2e2cb1SIlpo Järvinen 1370be2e2cb1SIlpo Järvinen rs485->flags &= supported_flags; 1371be2e2cb1SIlpo Järvinen 1372d8fcd9cfSLino Sanfilippo uart_sanitize_serial_rs485_delays(port, rs485); 1373d8fcd9cfSLino Sanfilippo 13742dbd0c14SIlpo Järvinen /* Return clean padding area to userspace */ 13754f768e94SIlpo Järvinen memset(rs485->padding0, 0, sizeof(rs485->padding0)); 13764f768e94SIlpo Järvinen memset(rs485->padding1, 0, sizeof(rs485->padding1)); 13772dbd0c14SIlpo Järvinen } 13782dbd0c14SIlpo Järvinen 137944b27aecSLino Sanfilippo static void uart_set_rs485_termination(struct uart_port *port, 138044b27aecSLino Sanfilippo const struct serial_rs485 *rs485) 138144b27aecSLino Sanfilippo { 138244b27aecSLino Sanfilippo if (!(rs485->flags & SER_RS485_ENABLED)) 138344b27aecSLino Sanfilippo return; 138444b27aecSLino Sanfilippo 138544b27aecSLino Sanfilippo gpiod_set_value_cansleep(port->rs485_term_gpio, 138644b27aecSLino Sanfilippo !!(rs485->flags & SER_RS485_TERMINATE_BUS)); 138744b27aecSLino Sanfilippo } 138844b27aecSLino Sanfilippo 13897c7f9bc9SLukas Wunner static int uart_rs485_config(struct uart_port *port) 13908322b1f5SIlpo Järvinen { 1391be2e2cb1SIlpo Järvinen struct serial_rs485 *rs485 = &port->rs485; 1392596a9171SIlpo Järvinen int ret; 1393be2e2cb1SIlpo Järvinen 1394be2e2cb1SIlpo Järvinen uart_sanitize_serial_rs485(port, rs485); 139544b27aecSLino Sanfilippo uart_set_rs485_termination(port, rs485); 1396be2e2cb1SIlpo Järvinen 1397ae50bb27SIlpo Järvinen ret = port->rs485_config(port, NULL, rs485); 1398596a9171SIlpo Järvinen if (ret) 1399596a9171SIlpo Järvinen memset(rs485, 0, sizeof(*rs485)); 1400596a9171SIlpo Järvinen 1401596a9171SIlpo Järvinen return ret; 14028322b1f5SIlpo Järvinen } 14038322b1f5SIlpo Järvinen 1404a5f276f1SRicardo Ribalda Delgado static int uart_get_rs485_config(struct uart_port *port, 1405a5f276f1SRicardo Ribalda Delgado struct serial_rs485 __user *rs485) 1406a5f276f1SRicardo Ribalda Delgado { 1407bd737f87SRicardo Ribalda Delgado unsigned long flags; 1408bd737f87SRicardo Ribalda Delgado struct serial_rs485 aux; 1409bd737f87SRicardo Ribalda Delgado 1410bd737f87SRicardo Ribalda Delgado spin_lock_irqsave(&port->lock, flags); 1411bd737f87SRicardo Ribalda Delgado aux = port->rs485; 1412bd737f87SRicardo Ribalda Delgado spin_unlock_irqrestore(&port->lock, flags); 1413bd737f87SRicardo Ribalda Delgado 1414bd737f87SRicardo Ribalda Delgado if (copy_to_user(rs485, &aux, sizeof(aux))) 1415a5f276f1SRicardo Ribalda Delgado return -EFAULT; 1416bd737f87SRicardo Ribalda Delgado 1417a5f276f1SRicardo Ribalda Delgado return 0; 1418a5f276f1SRicardo Ribalda Delgado } 1419a5f276f1SRicardo Ribalda Delgado 1420ae50bb27SIlpo Järvinen static int uart_set_rs485_config(struct tty_struct *tty, struct uart_port *port, 1421a5f276f1SRicardo Ribalda Delgado struct serial_rs485 __user *rs485_user) 1422a5f276f1SRicardo Ribalda Delgado { 1423a5f276f1SRicardo Ribalda Delgado struct serial_rs485 rs485; 1424a5f276f1SRicardo Ribalda Delgado int ret; 1425bd737f87SRicardo Ribalda Delgado unsigned long flags; 1426a5f276f1SRicardo Ribalda Delgado 1427a5f276f1SRicardo Ribalda Delgado if (!port->rs485_config) 142879c5966cSJohan Hovold return -ENOTTY; 1429a5f276f1SRicardo Ribalda Delgado 1430a5f276f1SRicardo Ribalda Delgado if (copy_from_user(&rs485, rs485_user, sizeof(*rs485_user))) 1431a5f276f1SRicardo Ribalda Delgado return -EFAULT; 1432a5f276f1SRicardo Ribalda Delgado 143351ad36baSIlpo Järvinen ret = uart_check_rs485_flags(port, &rs485); 143451ad36baSIlpo Järvinen if (ret) 143551ad36baSIlpo Järvinen return ret; 14362dbd0c14SIlpo Järvinen uart_sanitize_serial_rs485(port, &rs485); 143744b27aecSLino Sanfilippo uart_set_rs485_termination(port, &rs485); 14380ed12afaSLino Sanfilippo 1439bd737f87SRicardo Ribalda Delgado spin_lock_irqsave(&port->lock, flags); 1440ae50bb27SIlpo Järvinen ret = port->rs485_config(port, &tty->termios, &rs485); 14417c7f9bc9SLukas Wunner if (!ret) { 14420ed12afaSLino Sanfilippo port->rs485 = rs485; 14437c7f9bc9SLukas Wunner 14447c7f9bc9SLukas Wunner /* Reset RTS and other mctrl lines when disabling RS485 */ 14457c7f9bc9SLukas Wunner if (!(rs485.flags & SER_RS485_ENABLED)) 14467c7f9bc9SLukas Wunner port->ops->set_mctrl(port, port->mctrl); 14477c7f9bc9SLukas Wunner } 1448bd737f87SRicardo Ribalda Delgado spin_unlock_irqrestore(&port->lock, flags); 1449a5f276f1SRicardo Ribalda Delgado if (ret) 1450a5f276f1SRicardo Ribalda Delgado return ret; 1451a5f276f1SRicardo Ribalda Delgado 1452a5f276f1SRicardo Ribalda Delgado if (copy_to_user(rs485_user, &port->rs485, sizeof(port->rs485))) 1453a5f276f1SRicardo Ribalda Delgado return -EFAULT; 1454a5f276f1SRicardo Ribalda Delgado 1455a5f276f1SRicardo Ribalda Delgado return 0; 1456a5f276f1SRicardo Ribalda Delgado } 1457a5f276f1SRicardo Ribalda Delgado 1458ad8c0eaaSNicolas Ferre static int uart_get_iso7816_config(struct uart_port *port, 1459ad8c0eaaSNicolas Ferre struct serial_iso7816 __user *iso7816) 1460ad8c0eaaSNicolas Ferre { 1461ad8c0eaaSNicolas Ferre unsigned long flags; 1462ad8c0eaaSNicolas Ferre struct serial_iso7816 aux; 1463ad8c0eaaSNicolas Ferre 1464ad8c0eaaSNicolas Ferre if (!port->iso7816_config) 146579c5966cSJohan Hovold return -ENOTTY; 1466ad8c0eaaSNicolas Ferre 1467ad8c0eaaSNicolas Ferre spin_lock_irqsave(&port->lock, flags); 1468ad8c0eaaSNicolas Ferre aux = port->iso7816; 1469ad8c0eaaSNicolas Ferre spin_unlock_irqrestore(&port->lock, flags); 1470ad8c0eaaSNicolas Ferre 1471ad8c0eaaSNicolas Ferre if (copy_to_user(iso7816, &aux, sizeof(aux))) 1472ad8c0eaaSNicolas Ferre return -EFAULT; 1473ad8c0eaaSNicolas Ferre 1474ad8c0eaaSNicolas Ferre return 0; 1475ad8c0eaaSNicolas Ferre } 1476ad8c0eaaSNicolas Ferre 1477ad8c0eaaSNicolas Ferre static int uart_set_iso7816_config(struct uart_port *port, 1478ad8c0eaaSNicolas Ferre struct serial_iso7816 __user *iso7816_user) 1479ad8c0eaaSNicolas Ferre { 1480ad8c0eaaSNicolas Ferre struct serial_iso7816 iso7816; 1481ad8c0eaaSNicolas Ferre int i, ret; 1482ad8c0eaaSNicolas Ferre unsigned long flags; 1483ad8c0eaaSNicolas Ferre 1484ad8c0eaaSNicolas Ferre if (!port->iso7816_config) 148579c5966cSJohan Hovold return -ENOTTY; 1486ad8c0eaaSNicolas Ferre 1487ad8c0eaaSNicolas Ferre if (copy_from_user(&iso7816, iso7816_user, sizeof(*iso7816_user))) 1488ad8c0eaaSNicolas Ferre return -EFAULT; 1489ad8c0eaaSNicolas Ferre 1490ad8c0eaaSNicolas Ferre /* 1491ad8c0eaaSNicolas Ferre * There are 5 words reserved for future use. Check that userspace 1492ad8c0eaaSNicolas Ferre * doesn't put stuff in there to prevent breakages in the future. 1493ad8c0eaaSNicolas Ferre */ 1494ad8c0eaaSNicolas Ferre for (i = 0; i < 5; i++) 1495ad8c0eaaSNicolas Ferre if (iso7816.reserved[i]) 1496ad8c0eaaSNicolas Ferre return -EINVAL; 1497ad8c0eaaSNicolas Ferre 1498ad8c0eaaSNicolas Ferre spin_lock_irqsave(&port->lock, flags); 1499ad8c0eaaSNicolas Ferre ret = port->iso7816_config(port, &iso7816); 1500ad8c0eaaSNicolas Ferre spin_unlock_irqrestore(&port->lock, flags); 1501ad8c0eaaSNicolas Ferre if (ret) 1502ad8c0eaaSNicolas Ferre return ret; 1503ad8c0eaaSNicolas Ferre 1504ad8c0eaaSNicolas Ferre if (copy_to_user(iso7816_user, &port->iso7816, sizeof(port->iso7816))) 1505ad8c0eaaSNicolas Ferre return -EFAULT; 1506ad8c0eaaSNicolas Ferre 1507ad8c0eaaSNicolas Ferre return 0; 1508ad8c0eaaSNicolas Ferre } 1509ad8c0eaaSNicolas Ferre 1510ab4382d2SGreg Kroah-Hartman /* 1511ab4382d2SGreg Kroah-Hartman * Called via sys_ioctl. We can use spin_lock_irq() here. 1512ab4382d2SGreg Kroah-Hartman */ 1513ab4382d2SGreg Kroah-Hartman static int 15144047b371SPeter Hurley uart_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg) 1515ab4382d2SGreg Kroah-Hartman { 1516ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1517ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 15184047b371SPeter Hurley struct uart_port *uport; 1519ab4382d2SGreg Kroah-Hartman void __user *uarg = (void __user *)arg; 1520ab4382d2SGreg Kroah-Hartman int ret = -ENOIOCTLCMD; 1521ab4382d2SGreg Kroah-Hartman 1522ab4382d2SGreg Kroah-Hartman 1523ab4382d2SGreg Kroah-Hartman /* 1524ab4382d2SGreg Kroah-Hartman * These ioctls don't rely on the hardware to be present. 1525ab4382d2SGreg Kroah-Hartman */ 1526ab4382d2SGreg Kroah-Hartman switch (cmd) { 1527ab4382d2SGreg Kroah-Hartman case TIOCSERCONFIG: 15287c8ab967SPeter Hurley down_write(&tty->termios_rwsem); 1529ab4382d2SGreg Kroah-Hartman ret = uart_do_autoconfig(tty, state); 15307c8ab967SPeter Hurley up_write(&tty->termios_rwsem); 1531ab4382d2SGreg Kroah-Hartman break; 1532ab4382d2SGreg Kroah-Hartman } 1533ab4382d2SGreg Kroah-Hartman 1534ab4382d2SGreg Kroah-Hartman if (ret != -ENOIOCTLCMD) 1535ab4382d2SGreg Kroah-Hartman goto out; 1536ab4382d2SGreg Kroah-Hartman 153718900ca6SPeter Hurley if (tty_io_error(tty)) { 1538ab4382d2SGreg Kroah-Hartman ret = -EIO; 1539ab4382d2SGreg Kroah-Hartman goto out; 1540ab4382d2SGreg Kroah-Hartman } 1541ab4382d2SGreg Kroah-Hartman 1542ab4382d2SGreg Kroah-Hartman /* 1543ab4382d2SGreg Kroah-Hartman * The following should only be used when hardware is present. 1544ab4382d2SGreg Kroah-Hartman */ 1545ab4382d2SGreg Kroah-Hartman switch (cmd) { 1546ab4382d2SGreg Kroah-Hartman case TIOCMIWAIT: 1547ab4382d2SGreg Kroah-Hartman ret = uart_wait_modem_status(state, arg); 1548ab4382d2SGreg Kroah-Hartman break; 1549ab4382d2SGreg Kroah-Hartman } 1550ab4382d2SGreg Kroah-Hartman 1551ab4382d2SGreg Kroah-Hartman if (ret != -ENOIOCTLCMD) 1552ab4382d2SGreg Kroah-Hartman goto out; 1553ab4382d2SGreg Kroah-Hartman 1554ae50bb27SIlpo Järvinen /* rs485_config requires more locking than others */ 1555ae50bb27SIlpo Järvinen if (cmd == TIOCGRS485) 1556ae50bb27SIlpo Järvinen down_write(&tty->termios_rwsem); 1557ae50bb27SIlpo Järvinen 1558ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 15594047b371SPeter Hurley uport = uart_port_check(state); 1560ab4382d2SGreg Kroah-Hartman 15614047b371SPeter Hurley if (!uport || tty_io_error(tty)) { 1562ab4382d2SGreg Kroah-Hartman ret = -EIO; 1563ab4382d2SGreg Kroah-Hartman goto out_up; 1564ab4382d2SGreg Kroah-Hartman } 1565ab4382d2SGreg Kroah-Hartman 1566ab4382d2SGreg Kroah-Hartman /* 1567ab4382d2SGreg Kroah-Hartman * All these rely on hardware being present and need to be 1568ab4382d2SGreg Kroah-Hartman * protected against the tty being hung up. 1569ab4382d2SGreg Kroah-Hartman */ 1570a9c20a9cSRicardo Ribalda Delgado 1571ab4382d2SGreg Kroah-Hartman switch (cmd) { 1572a9c20a9cSRicardo Ribalda Delgado case TIOCSERGETLSR: /* Get line status register */ 1573a9c20a9cSRicardo Ribalda Delgado ret = uart_get_lsr_info(tty, state, uarg); 1574a9c20a9cSRicardo Ribalda Delgado break; 1575a9c20a9cSRicardo Ribalda Delgado 1576a5f276f1SRicardo Ribalda Delgado case TIOCGRS485: 15774047b371SPeter Hurley ret = uart_get_rs485_config(uport, uarg); 1578a5f276f1SRicardo Ribalda Delgado break; 1579a5f276f1SRicardo Ribalda Delgado 1580a5f276f1SRicardo Ribalda Delgado case TIOCSRS485: 1581ae50bb27SIlpo Järvinen ret = uart_set_rs485_config(tty, uport, uarg); 1582a5f276f1SRicardo Ribalda Delgado break; 1583ad8c0eaaSNicolas Ferre 1584ad8c0eaaSNicolas Ferre case TIOCSISO7816: 1585ad8c0eaaSNicolas Ferre ret = uart_set_iso7816_config(state->uart_port, uarg); 1586ad8c0eaaSNicolas Ferre break; 1587ad8c0eaaSNicolas Ferre 1588ad8c0eaaSNicolas Ferre case TIOCGISO7816: 1589ad8c0eaaSNicolas Ferre ret = uart_get_iso7816_config(state->uart_port, uarg); 1590ad8c0eaaSNicolas Ferre break; 15914047b371SPeter Hurley default: 1592ab4382d2SGreg Kroah-Hartman if (uport->ops->ioctl) 1593ab4382d2SGreg Kroah-Hartman ret = uport->ops->ioctl(uport, cmd, arg); 1594ab4382d2SGreg Kroah-Hartman break; 1595ab4382d2SGreg Kroah-Hartman } 1596ab4382d2SGreg Kroah-Hartman out_up: 1597ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1598ae50bb27SIlpo Järvinen if (cmd == TIOCGRS485) 1599ae50bb27SIlpo Järvinen up_write(&tty->termios_rwsem); 1600ab4382d2SGreg Kroah-Hartman out: 1601ab4382d2SGreg Kroah-Hartman return ret; 1602ab4382d2SGreg Kroah-Hartman } 1603ab4382d2SGreg Kroah-Hartman 1604ab4382d2SGreg Kroah-Hartman static void uart_set_ldisc(struct tty_struct *tty) 1605ab4382d2SGreg Kroah-Hartman { 1606ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 16074047b371SPeter Hurley struct uart_port *uport; 16082f70e49eSAlexey Kardashevskiy struct tty_port *port = &state->port; 16092f70e49eSAlexey Kardashevskiy 16102f70e49eSAlexey Kardashevskiy if (!tty_port_initialized(port)) 16112f70e49eSAlexey Kardashevskiy return; 1612ab4382d2SGreg Kroah-Hartman 1613db1b9dfcSPeter Hurley mutex_lock(&state->port.mutex); 16144047b371SPeter Hurley uport = uart_port_check(state); 16154047b371SPeter Hurley if (uport && uport->ops->set_ldisc) 1616732a84a0SPeter Hurley uport->ops->set_ldisc(uport, &tty->termios); 1617db1b9dfcSPeter Hurley mutex_unlock(&state->port.mutex); 1618db1b9dfcSPeter Hurley } 1619ab4382d2SGreg Kroah-Hartman 1620ab4382d2SGreg Kroah-Hartman static void uart_set_termios(struct tty_struct *tty, 1621a8c11c15SIlpo Järvinen const struct ktermios *old_termios) 1622ab4382d2SGreg Kroah-Hartman { 1623ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 16244047b371SPeter Hurley struct uart_port *uport; 1625adc8d746SAlan Cox unsigned int cflag = tty->termios.c_cflag; 16262cbacafdSRussell King unsigned int iflag_mask = IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK; 16272cbacafdSRussell King bool sw_changed = false; 1628ab4382d2SGreg Kroah-Hartman 16294047b371SPeter Hurley mutex_lock(&state->port.mutex); 16304047b371SPeter Hurley uport = uart_port_check(state); 16314047b371SPeter Hurley if (!uport) 16324047b371SPeter Hurley goto out; 16334047b371SPeter Hurley 16342cbacafdSRussell King /* 16352cbacafdSRussell King * Drivers doing software flow control also need to know 16362cbacafdSRussell King * about changes to these input settings. 16372cbacafdSRussell King */ 16382cbacafdSRussell King if (uport->flags & UPF_SOFT_FLOW) { 16392cbacafdSRussell King iflag_mask |= IXANY|IXON|IXOFF; 16402cbacafdSRussell King sw_changed = 16412cbacafdSRussell King tty->termios.c_cc[VSTART] != old_termios->c_cc[VSTART] || 16422cbacafdSRussell King tty->termios.c_cc[VSTOP] != old_termios->c_cc[VSTOP]; 16432cbacafdSRussell King } 1644ab4382d2SGreg Kroah-Hartman 1645ab4382d2SGreg Kroah-Hartman /* 1646ab4382d2SGreg Kroah-Hartman * These are the bits that are used to setup various 1647ab4382d2SGreg Kroah-Hartman * flags in the low level driver. We can ignore the Bfoo 1648ab4382d2SGreg Kroah-Hartman * bits in c_cflag; c_[io]speed will always be set 1649ab4382d2SGreg Kroah-Hartman * appropriately by set_termios() in tty_ioctl.c 1650ab4382d2SGreg Kroah-Hartman */ 1651ab4382d2SGreg Kroah-Hartman if ((cflag ^ old_termios->c_cflag) == 0 && 1652adc8d746SAlan Cox tty->termios.c_ospeed == old_termios->c_ospeed && 1653adc8d746SAlan Cox tty->termios.c_ispeed == old_termios->c_ispeed && 16542cbacafdSRussell King ((tty->termios.c_iflag ^ old_termios->c_iflag) & iflag_mask) == 0 && 16552cbacafdSRussell King !sw_changed) { 16564047b371SPeter Hurley goto out; 1657ab4382d2SGreg Kroah-Hartman } 1658ab4382d2SGreg Kroah-Hartman 1659ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, old_termios); 1660c7a6b9e4SHariprasad Kelam /* reload cflag from termios; port driver may have overridden flags */ 1661c18b55fdSPeter Hurley cflag = tty->termios.c_cflag; 1662ab4382d2SGreg Kroah-Hartman 1663ab4382d2SGreg Kroah-Hartman /* Handle transition to B0 status */ 1664ab4382d2SGreg Kroah-Hartman if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) 1665dec94e70SRussell King uart_clear_mctrl(uport, TIOCM_RTS | TIOCM_DTR); 1666ab4382d2SGreg Kroah-Hartman /* Handle transition away from B0 status */ 1667ab4382d2SGreg Kroah-Hartman else if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { 1668ab4382d2SGreg Kroah-Hartman unsigned int mask = TIOCM_DTR; 16694ed71addSTamseel Shams 167097ef38b8SPeter Hurley if (!(cflag & CRTSCTS) || !tty_throttled(tty)) 1671ab4382d2SGreg Kroah-Hartman mask |= TIOCM_RTS; 1672dec94e70SRussell King uart_set_mctrl(uport, mask); 1673ab4382d2SGreg Kroah-Hartman } 16744047b371SPeter Hurley out: 16754047b371SPeter Hurley mutex_unlock(&state->port.mutex); 1676ab4382d2SGreg Kroah-Hartman } 1677ab4382d2SGreg Kroah-Hartman 1678ab4382d2SGreg Kroah-Hartman /* 1679ef4f527cSKevin Cernekee * Calls to uart_close() are serialised via the tty_lock in 1680ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:tty_release() 1681ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:do_tty_hangup() 1682ab4382d2SGreg Kroah-Hartman */ 1683ab4382d2SGreg Kroah-Hartman static void uart_close(struct tty_struct *tty, struct file *filp) 1684ab4382d2SGreg Kroah-Hartman { 1685ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1686ab4382d2SGreg Kroah-Hartman 168791b32f54SPeter Hurley if (!state) { 168891b32f54SPeter Hurley struct uart_driver *drv = tty->driver->driver_state; 16899356335fSColin Ian King struct tty_port *port; 169091b32f54SPeter Hurley 169191b32f54SPeter Hurley state = drv->state + tty->index; 169291b32f54SPeter Hurley port = &state->port; 169391b32f54SPeter Hurley spin_lock_irq(&port->lock); 169491b32f54SPeter Hurley --port->count; 169591b32f54SPeter Hurley spin_unlock_irq(&port->lock); 1696ab4382d2SGreg Kroah-Hartman return; 169791b32f54SPeter Hurley } 1698ab4382d2SGreg Kroah-Hartman 169939b3d892SPeter Hurley pr_debug("uart_close(%d) called\n", tty->index); 1700ab4382d2SGreg Kroah-Hartman 1701761ed4a9SRob Herring tty_port_close(tty->port, tty, filp); 1702761ed4a9SRob Herring } 1703ab4382d2SGreg Kroah-Hartman 1704761ed4a9SRob Herring static void uart_tty_port_shutdown(struct tty_port *port) 1705761ed4a9SRob Herring { 1706761ed4a9SRob Herring struct uart_state *state = container_of(port, struct uart_state, port); 1707761ed4a9SRob Herring struct uart_port *uport = uart_port_check(state); 170800de977fSJohan Hovold char *buf; 1709af224ca2SPeter Hurley 1710ab4382d2SGreg Kroah-Hartman /* 1711ab4382d2SGreg Kroah-Hartman * At this point, we stop accepting input. To do this, we 1712ab4382d2SGreg Kroah-Hartman * disable the receive line status interrupts. 1713ab4382d2SGreg Kroah-Hartman */ 1714a5a2b130SAndy Shevchenko if (WARN(!uport, "detached port still initialized!\n")) 1715a5a2b130SAndy Shevchenko return; 1716761ed4a9SRob Herring 1717a5a2b130SAndy Shevchenko spin_lock_irq(&uport->lock); 1718ab4382d2SGreg Kroah-Hartman uport->ops->stop_rx(uport); 17196fb98fb3SPeter Hurley spin_unlock_irq(&uport->lock); 1720761ed4a9SRob Herring 1721761ed4a9SRob Herring uart_port_shutdown(port); 1722761ed4a9SRob Herring 1723ab4382d2SGreg Kroah-Hartman /* 1724761ed4a9SRob Herring * It's possible for shutdown to be called after suspend if we get 1725761ed4a9SRob Herring * a DCD drop (hangup) at just the right time. Clear suspended bit so 1726761ed4a9SRob Herring * we don't try to resume a port that has been shutdown. 1727ab4382d2SGreg Kroah-Hartman */ 172875b20a2aSIlpo Järvinen tty_port_set_suspended(port, false); 1729ab4382d2SGreg Kroah-Hartman 173000de977fSJohan Hovold /* 173100de977fSJohan Hovold * Free the transmit buffer. 173200de977fSJohan Hovold */ 173300de977fSJohan Hovold spin_lock_irq(&uport->lock); 173400de977fSJohan Hovold buf = state->xmit.buf; 173500de977fSJohan Hovold state->xmit.buf = NULL; 173600de977fSJohan Hovold spin_unlock_irq(&uport->lock); 1737ab4382d2SGreg Kroah-Hartman 173800de977fSJohan Hovold free_page((unsigned long)buf); 173900de977fSJohan Hovold 174000de977fSJohan Hovold uart_change_pm(state, UART_PM_STATE_OFF); 1741ab4382d2SGreg Kroah-Hartman } 1742ab4382d2SGreg Kroah-Hartman 17431f33a51dSJiri Slaby static void uart_wait_until_sent(struct tty_struct *tty, int timeout) 1744ab4382d2SGreg Kroah-Hartman { 17451f33a51dSJiri Slaby struct uart_state *state = tty->driver_data; 17469ed19428SPeter Hurley struct uart_port *port; 1747f9008285SIlpo Järvinen unsigned long char_time, expire, fifo_timeout; 1748ab4382d2SGreg Kroah-Hartman 17499ed19428SPeter Hurley port = uart_port_ref(state); 1750ef510beaSAndy Shevchenko if (!port) 1751ef510beaSAndy Shevchenko return; 1752ef510beaSAndy Shevchenko 1753ef510beaSAndy Shevchenko if (port->type == PORT_UNKNOWN || port->fifosize == 0) { 17549ed19428SPeter Hurley uart_port_deref(port); 1755ab4382d2SGreg Kroah-Hartman return; 17569ed19428SPeter Hurley } 1757ab4382d2SGreg Kroah-Hartman 1758ab4382d2SGreg Kroah-Hartman /* 1759ab4382d2SGreg Kroah-Hartman * Set the check interval to be 1/5 of the estimated time to 1760ab4382d2SGreg Kroah-Hartman * send a single character, and make it at least 1. The check 1761ab4382d2SGreg Kroah-Hartman * interval should also be less than the timeout. 1762ab4382d2SGreg Kroah-Hartman * 1763ab4382d2SGreg Kroah-Hartman * Note: we have to use pretty tight timings here to satisfy 1764ab4382d2SGreg Kroah-Hartman * the NIST-PCTS. 1765ab4382d2SGreg Kroah-Hartman */ 176631f6bd7fSIlpo Järvinen char_time = max(nsecs_to_jiffies(port->frame_time / 5), 1UL); 176731f6bd7fSIlpo Järvinen 1768ab4382d2SGreg Kroah-Hartman if (timeout && timeout < char_time) 1769ab4382d2SGreg Kroah-Hartman char_time = timeout; 1770ab4382d2SGreg Kroah-Hartman 1771b0e0bd9dSTomasz Moń if (!uart_cts_enabled(port)) { 1772ab4382d2SGreg Kroah-Hartman /* 1773ab4382d2SGreg Kroah-Hartman * If the transmitter hasn't cleared in twice the approximate 1774ab4382d2SGreg Kroah-Hartman * amount of time to send the entire FIFO, it probably won't 1775ab4382d2SGreg Kroah-Hartman * ever clear. This assumes the UART isn't doing flow 1776ab4382d2SGreg Kroah-Hartman * control, which is currently the case. Hence, if it ever 1777f9008285SIlpo Järvinen * takes longer than FIFO timeout, this is probably due to a 1778ab4382d2SGreg Kroah-Hartman * UART bug of some kind. So, we clamp the timeout parameter at 1779f9008285SIlpo Järvinen * 2 * FIFO timeout. 1780ab4382d2SGreg Kroah-Hartman */ 1781f9008285SIlpo Järvinen fifo_timeout = uart_fifo_timeout(port); 1782f9008285SIlpo Järvinen if (timeout == 0 || timeout > 2 * fifo_timeout) 1783f9008285SIlpo Järvinen timeout = 2 * fifo_timeout; 1784b0e0bd9dSTomasz Moń } 1785ab4382d2SGreg Kroah-Hartman 1786ab4382d2SGreg Kroah-Hartman expire = jiffies + timeout; 1787ab4382d2SGreg Kroah-Hartman 1788ab4382d2SGreg Kroah-Hartman pr_debug("uart_wait_until_sent(%d), jiffies=%lu, expire=%lu...\n", 1789ab4382d2SGreg Kroah-Hartman port->line, jiffies, expire); 1790ab4382d2SGreg Kroah-Hartman 1791ab4382d2SGreg Kroah-Hartman /* 1792ab4382d2SGreg Kroah-Hartman * Check whether the transmitter is empty every 'char_time'. 1793ab4382d2SGreg Kroah-Hartman * 'timeout' / 'expire' give us the maximum amount of time 1794ab4382d2SGreg Kroah-Hartman * we wait. 1795ab4382d2SGreg Kroah-Hartman */ 1796ab4382d2SGreg Kroah-Hartman while (!port->ops->tx_empty(port)) { 1797ab4382d2SGreg Kroah-Hartman msleep_interruptible(jiffies_to_msecs(char_time)); 1798ab4382d2SGreg Kroah-Hartman if (signal_pending(current)) 1799ab4382d2SGreg Kroah-Hartman break; 1800b0e0bd9dSTomasz Moń if (timeout && time_after(jiffies, expire)) 1801ab4382d2SGreg Kroah-Hartman break; 1802ab4382d2SGreg Kroah-Hartman } 18039ed19428SPeter Hurley uart_port_deref(port); 1804ab4382d2SGreg Kroah-Hartman } 1805ab4382d2SGreg Kroah-Hartman 1806ab4382d2SGreg Kroah-Hartman /* 1807ef4f527cSKevin Cernekee * Calls to uart_hangup() are serialised by the tty_lock in 1808ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:do_tty_hangup() 1809ef4f527cSKevin Cernekee * This runs from a workqueue and can sleep for a _short_ time only. 1810ab4382d2SGreg Kroah-Hartman */ 1811ab4382d2SGreg Kroah-Hartman static void uart_hangup(struct tty_struct *tty) 1812ab4382d2SGreg Kroah-Hartman { 1813ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1814ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1815af224ca2SPeter Hurley struct uart_port *uport; 1816ab4382d2SGreg Kroah-Hartman unsigned long flags; 1817ab4382d2SGreg Kroah-Hartman 181839b3d892SPeter Hurley pr_debug("uart_hangup(%d)\n", tty->index); 1819ab4382d2SGreg Kroah-Hartman 1820ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1821af224ca2SPeter Hurley uport = uart_port_check(state); 1822af224ca2SPeter Hurley WARN(!uport, "hangup of detached port!\n"); 1823af224ca2SPeter Hurley 1824807c8d81SPeter Hurley if (tty_port_active(port)) { 1825ab4382d2SGreg Kroah-Hartman uart_flush_buffer(tty); 1826ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 1827ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 1828ab4382d2SGreg Kroah-Hartman port->count = 0; 1829ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 18309b5aa549SIlpo Järvinen tty_port_set_active(port, false); 1831ab4382d2SGreg Kroah-Hartman tty_port_tty_set(port, NULL); 1832af224ca2SPeter Hurley if (uport && !uart_console(uport)) 1833bf903c0cSGeert Uytterhoeven uart_change_pm(state, UART_PM_STATE_OFF); 1834ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->open_wait); 1835ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->delta_msr_wait); 1836ab4382d2SGreg Kroah-Hartman } 1837ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1838ab4382d2SGreg Kroah-Hartman } 1839ab4382d2SGreg Kroah-Hartman 1840af224ca2SPeter Hurley /* uport == NULL if uart_port has already been removed */ 18410b1db830SJiri Slaby static void uart_port_shutdown(struct tty_port *port) 18420b1db830SJiri Slaby { 1843b922e19dSJiri Slaby struct uart_state *state = container_of(port, struct uart_state, port); 18444047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 1845b922e19dSJiri Slaby 1846b922e19dSJiri Slaby /* 1847b922e19dSJiri Slaby * clear delta_msr_wait queue to avoid mem leaks: we may free 1848b922e19dSJiri Slaby * the irq here so the queue might never be woken up. Note 1849b922e19dSJiri Slaby * that we won't end up waiting on delta_msr_wait again since 1850b922e19dSJiri Slaby * any outstanding file descriptors should be pointing at 1851b922e19dSJiri Slaby * hung_up_tty_fops now. 1852b922e19dSJiri Slaby */ 1853b922e19dSJiri Slaby wake_up_interruptible(&port->delta_msr_wait); 1854b922e19dSJiri Slaby 18552765852eSJiri Slaby if (uport) { 18562765852eSJiri Slaby /* Free the IRQ and disable the port. */ 1857b922e19dSJiri Slaby uport->ops->shutdown(uport); 1858b922e19dSJiri Slaby 18592765852eSJiri Slaby /* Ensure that the IRQ handler isn't running on another CPU. */ 1860b922e19dSJiri Slaby synchronize_irq(uport->irq); 18610b1db830SJiri Slaby } 18622765852eSJiri Slaby } 18630b1db830SJiri Slaby 1864*b300fb26SIlpo Järvinen static bool uart_carrier_raised(struct tty_port *port) 1865ab4382d2SGreg Kroah-Hartman { 1866ab4382d2SGreg Kroah-Hartman struct uart_state *state = container_of(port, struct uart_state, port); 18679ed19428SPeter Hurley struct uart_port *uport; 1868ab4382d2SGreg Kroah-Hartman int mctrl; 18699ed19428SPeter Hurley 18709ed19428SPeter Hurley uport = uart_port_ref(state); 18719ed19428SPeter Hurley /* 18729ed19428SPeter Hurley * Should never observe uport == NULL since checks for hangup should 18739ed19428SPeter Hurley * abort the tty_port_block_til_ready() loop before checking for carrier 18749ed19428SPeter Hurley * raised -- but report carrier raised if it does anyway so open will 18759ed19428SPeter Hurley * continue and not sleep 18769ed19428SPeter Hurley */ 18779ed19428SPeter Hurley if (WARN_ON(!uport)) 1878*b300fb26SIlpo Järvinen return true; 1879ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 18801fdc3106SAlexander Shiyan uart_enable_ms(uport); 1881ab4382d2SGreg Kroah-Hartman mctrl = uport->ops->get_mctrl(uport); 1882ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 18839ed19428SPeter Hurley uart_port_deref(uport); 1884*b300fb26SIlpo Järvinen 1885*b300fb26SIlpo Järvinen return mctrl & TIOCM_CAR; 1886ab4382d2SGreg Kroah-Hartman } 1887ab4382d2SGreg Kroah-Hartman 1888a6845e1eSRafael Gago static void uart_dtr_rts(struct tty_port *port, int raise) 1889ab4382d2SGreg Kroah-Hartman { 1890ab4382d2SGreg Kroah-Hartman struct uart_state *state = container_of(port, struct uart_state, port); 18919ed19428SPeter Hurley struct uart_port *uport; 18929ed19428SPeter Hurley 18939ed19428SPeter Hurley uport = uart_port_ref(state); 18949ed19428SPeter Hurley if (!uport) 18959ed19428SPeter Hurley return; 1896a6845e1eSRafael Gago uart_port_dtr_rts(uport, raise); 18979ed19428SPeter Hurley uart_port_deref(uport); 1898ab4382d2SGreg Kroah-Hartman } 1899ab4382d2SGreg Kroah-Hartman 19004cdd17baSJiri Slaby static int uart_install(struct tty_driver *driver, struct tty_struct *tty) 19014cdd17baSJiri Slaby { 19024cdd17baSJiri Slaby struct uart_driver *drv = driver->driver_state; 19034cdd17baSJiri Slaby struct uart_state *state = drv->state + tty->index; 19044cdd17baSJiri Slaby 19054cdd17baSJiri Slaby tty->driver_data = state; 19064cdd17baSJiri Slaby 19074cdd17baSJiri Slaby return tty_standard_install(driver, tty); 19084cdd17baSJiri Slaby } 19094cdd17baSJiri Slaby 1910ab4382d2SGreg Kroah-Hartman /* 1911ef4f527cSKevin Cernekee * Calls to uart_open are serialised by the tty_lock in 1912ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:tty_open() 1913ab4382d2SGreg Kroah-Hartman * Note that if this fails, then uart_close() _will_ be called. 1914ab4382d2SGreg Kroah-Hartman * 1915ab4382d2SGreg Kroah-Hartman * In time, we want to scrap the "opening nonpresent ports" 1916ab4382d2SGreg Kroah-Hartman * behaviour and implement an alternative way for setserial 1917ab4382d2SGreg Kroah-Hartman * to set base addresses/ports/types. This will allow us to 1918ab4382d2SGreg Kroah-Hartman * get rid of a certain amount of extra tests. 1919ab4382d2SGreg Kroah-Hartman */ 1920ab4382d2SGreg Kroah-Hartman static int uart_open(struct tty_struct *tty, struct file *filp) 1921ab4382d2SGreg Kroah-Hartman { 19224cdd17baSJiri Slaby struct uart_state *state = tty->driver_data; 19234cdd17baSJiri Slaby int retval; 1924b3b57646SRob Herring 1925b3b57646SRob Herring retval = tty_port_open(&state->port, tty, filp); 1926b3b57646SRob Herring if (retval > 0) 1927b3b57646SRob Herring retval = 0; 1928b3b57646SRob Herring 1929b3b57646SRob Herring return retval; 1930b3b57646SRob Herring } 1931b3b57646SRob Herring 1932b3b57646SRob Herring static int uart_port_activate(struct tty_port *port, struct tty_struct *tty) 1933b3b57646SRob Herring { 1934b3b57646SRob Herring struct uart_state *state = container_of(port, struct uart_state, port); 1935b3b57646SRob Herring struct uart_port *uport; 193613b18d35SSerge Semin int ret; 1937b3b57646SRob Herring 1938b3b57646SRob Herring uport = uart_port_check(state); 1939b3b57646SRob Herring if (!uport || uport->flags & UPF_DEAD) 1940b3b57646SRob Herring return -ENXIO; 1941b3b57646SRob Herring 1942ab4382d2SGreg Kroah-Hartman /* 1943ab4382d2SGreg Kroah-Hartman * Start up the serial port. 1944ab4382d2SGreg Kroah-Hartman */ 1945dcd794c6SIlpo Järvinen ret = uart_startup(tty, state, false); 194613b18d35SSerge Semin if (ret > 0) 19479b5aa549SIlpo Järvinen tty_port_set_active(port, true); 194813b18d35SSerge Semin 194913b18d35SSerge Semin return ret; 1950ab4382d2SGreg Kroah-Hartman } 1951ab4382d2SGreg Kroah-Hartman 1952ab4382d2SGreg Kroah-Hartman static const char *uart_type(struct uart_port *port) 1953ab4382d2SGreg Kroah-Hartman { 1954ab4382d2SGreg Kroah-Hartman const char *str = NULL; 1955ab4382d2SGreg Kroah-Hartman 1956ab4382d2SGreg Kroah-Hartman if (port->ops->type) 1957ab4382d2SGreg Kroah-Hartman str = port->ops->type(port); 1958ab4382d2SGreg Kroah-Hartman 1959ab4382d2SGreg Kroah-Hartman if (!str) 1960ab4382d2SGreg Kroah-Hartman str = "unknown"; 1961ab4382d2SGreg Kroah-Hartman 1962ab4382d2SGreg Kroah-Hartman return str; 1963ab4382d2SGreg Kroah-Hartman } 1964ab4382d2SGreg Kroah-Hartman 1965ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_PROC_FS 1966ab4382d2SGreg Kroah-Hartman 1967ab4382d2SGreg Kroah-Hartman static void uart_line_info(struct seq_file *m, struct uart_driver *drv, int i) 1968ab4382d2SGreg Kroah-Hartman { 1969ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + i; 1970ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 19716f538fe3SLinus Walleij enum uart_pm_state pm_state; 19724047b371SPeter Hurley struct uart_port *uport; 1973ab4382d2SGreg Kroah-Hartman char stat_buf[32]; 1974ab4382d2SGreg Kroah-Hartman unsigned int status; 1975ab4382d2SGreg Kroah-Hartman int mmio; 1976ab4382d2SGreg Kroah-Hartman 19774047b371SPeter Hurley mutex_lock(&port->mutex); 19784047b371SPeter Hurley uport = uart_port_check(state); 1979ab4382d2SGreg Kroah-Hartman if (!uport) 19804047b371SPeter Hurley goto out; 1981ab4382d2SGreg Kroah-Hartman 1982ab4382d2SGreg Kroah-Hartman mmio = uport->iotype >= UPIO_MEM; 1983ab4382d2SGreg Kroah-Hartman seq_printf(m, "%d: uart:%s %s%08llX irq:%d", 1984ab4382d2SGreg Kroah-Hartman uport->line, uart_type(uport), 1985ab4382d2SGreg Kroah-Hartman mmio ? "mmio:0x" : "port:", 1986ab4382d2SGreg Kroah-Hartman mmio ? (unsigned long long)uport->mapbase 1987ab4382d2SGreg Kroah-Hartman : (unsigned long long)uport->iobase, 1988ab4382d2SGreg Kroah-Hartman uport->irq); 1989ab4382d2SGreg Kroah-Hartman 1990ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) { 1991ab4382d2SGreg Kroah-Hartman seq_putc(m, '\n'); 19924047b371SPeter Hurley goto out; 1993ab4382d2SGreg Kroah-Hartman } 1994ab4382d2SGreg Kroah-Hartman 1995ab4382d2SGreg Kroah-Hartman if (capable(CAP_SYS_ADMIN)) { 1996ab4382d2SGreg Kroah-Hartman pm_state = state->pm_state; 19976f538fe3SLinus Walleij if (pm_state != UART_PM_STATE_ON) 19986f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 1999ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 2000ab4382d2SGreg Kroah-Hartman status = uport->ops->get_mctrl(uport); 2001ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 20026f538fe3SLinus Walleij if (pm_state != UART_PM_STATE_ON) 2003ab4382d2SGreg Kroah-Hartman uart_change_pm(state, pm_state); 2004ab4382d2SGreg Kroah-Hartman 2005ab4382d2SGreg Kroah-Hartman seq_printf(m, " tx:%d rx:%d", 2006ab4382d2SGreg Kroah-Hartman uport->icount.tx, uport->icount.rx); 2007ab4382d2SGreg Kroah-Hartman if (uport->icount.frame) 2008968af298SPeter Hurley seq_printf(m, " fe:%d", uport->icount.frame); 2009ab4382d2SGreg Kroah-Hartman if (uport->icount.parity) 2010968af298SPeter Hurley seq_printf(m, " pe:%d", uport->icount.parity); 2011ab4382d2SGreg Kroah-Hartman if (uport->icount.brk) 2012968af298SPeter Hurley seq_printf(m, " brk:%d", uport->icount.brk); 2013ab4382d2SGreg Kroah-Hartman if (uport->icount.overrun) 2014968af298SPeter Hurley seq_printf(m, " oe:%d", uport->icount.overrun); 20154f794097SJeremy Kerr if (uport->icount.buf_overrun) 20164f794097SJeremy Kerr seq_printf(m, " bo:%d", uport->icount.buf_overrun); 2017ab4382d2SGreg Kroah-Hartman 2018ab4382d2SGreg Kroah-Hartman #define INFOBIT(bit, str) \ 2019ab4382d2SGreg Kroah-Hartman if (uport->mctrl & (bit)) \ 2020ab4382d2SGreg Kroah-Hartman strncat(stat_buf, (str), sizeof(stat_buf) - \ 2021ab4382d2SGreg Kroah-Hartman strlen(stat_buf) - 2) 2022ab4382d2SGreg Kroah-Hartman #define STATBIT(bit, str) \ 2023ab4382d2SGreg Kroah-Hartman if (status & (bit)) \ 2024ab4382d2SGreg Kroah-Hartman strncat(stat_buf, (str), sizeof(stat_buf) - \ 2025ab4382d2SGreg Kroah-Hartman strlen(stat_buf) - 2) 2026ab4382d2SGreg Kroah-Hartman 2027ab4382d2SGreg Kroah-Hartman stat_buf[0] = '\0'; 2028ab4382d2SGreg Kroah-Hartman stat_buf[1] = '\0'; 2029ab4382d2SGreg Kroah-Hartman INFOBIT(TIOCM_RTS, "|RTS"); 2030ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_CTS, "|CTS"); 2031ab4382d2SGreg Kroah-Hartman INFOBIT(TIOCM_DTR, "|DTR"); 2032ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_DSR, "|DSR"); 2033ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_CAR, "|CD"); 2034ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_RNG, "|RI"); 2035ab4382d2SGreg Kroah-Hartman if (stat_buf[0]) 2036ab4382d2SGreg Kroah-Hartman stat_buf[0] = ' '; 2037ab4382d2SGreg Kroah-Hartman 2038ab4382d2SGreg Kroah-Hartman seq_puts(m, stat_buf); 2039ab4382d2SGreg Kroah-Hartman } 2040ab4382d2SGreg Kroah-Hartman seq_putc(m, '\n'); 2041ab4382d2SGreg Kroah-Hartman #undef STATBIT 2042ab4382d2SGreg Kroah-Hartman #undef INFOBIT 20434047b371SPeter Hurley out: 20444047b371SPeter Hurley mutex_unlock(&port->mutex); 2045ab4382d2SGreg Kroah-Hartman } 2046ab4382d2SGreg Kroah-Hartman 2047ab4382d2SGreg Kroah-Hartman static int uart_proc_show(struct seq_file *m, void *v) 2048ab4382d2SGreg Kroah-Hartman { 2049ab4382d2SGreg Kroah-Hartman struct tty_driver *ttydrv = m->private; 2050ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = ttydrv->driver_state; 2051ab4382d2SGreg Kroah-Hartman int i; 2052ab4382d2SGreg Kroah-Hartman 2053968af298SPeter Hurley seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n", "", "", ""); 2054ab4382d2SGreg Kroah-Hartman for (i = 0; i < drv->nr; i++) 2055ab4382d2SGreg Kroah-Hartman uart_line_info(m, drv, i); 2056ab4382d2SGreg Kroah-Hartman return 0; 2057ab4382d2SGreg Kroah-Hartman } 2058ab4382d2SGreg Kroah-Hartman #endif 2059ab4382d2SGreg Kroah-Hartman 2060e0830dbfSJohan Hovold static void uart_port_spin_lock_init(struct uart_port *port) 2061f743061aSAndy Shevchenko { 2062f743061aSAndy Shevchenko spin_lock_init(&port->lock); 2063f743061aSAndy Shevchenko lockdep_set_class(&port->lock, &port_lock_key); 2064f743061aSAndy Shevchenko } 2065f743061aSAndy Shevchenko 2066ab4382d2SGreg Kroah-Hartman #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL) 20671cfe42b7SPeter Hurley /** 2068ab4382d2SGreg Kroah-Hartman * uart_console_write - write a console message to a serial port 2069ab4382d2SGreg Kroah-Hartman * @port: the port to write the message 2070ab4382d2SGreg Kroah-Hartman * @s: array of characters 2071ab4382d2SGreg Kroah-Hartman * @count: number of characters in string to write 207210afbe34SPeter Hurley * @putchar: function to write character to port 2073ab4382d2SGreg Kroah-Hartman */ 2074ab4382d2SGreg Kroah-Hartman void uart_console_write(struct uart_port *port, const char *s, 2075ab4382d2SGreg Kroah-Hartman unsigned int count, 20763f8bab17SJiri Slaby void (*putchar)(struct uart_port *, unsigned char)) 2077ab4382d2SGreg Kroah-Hartman { 2078ab4382d2SGreg Kroah-Hartman unsigned int i; 2079ab4382d2SGreg Kroah-Hartman 2080ab4382d2SGreg Kroah-Hartman for (i = 0; i < count; i++, s++) { 2081ab4382d2SGreg Kroah-Hartman if (*s == '\n') 2082ab4382d2SGreg Kroah-Hartman putchar(port, '\r'); 2083ab4382d2SGreg Kroah-Hartman putchar(port, *s); 2084ab4382d2SGreg Kroah-Hartman } 2085ab4382d2SGreg Kroah-Hartman } 2086ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_console_write); 2087ab4382d2SGreg Kroah-Hartman 20889e5f399fSJiri Slaby /** 20899e5f399fSJiri Slaby * uart_get_console - get uart port for console 20909e5f399fSJiri Slaby * @ports: ports to search in 20919e5f399fSJiri Slaby * @nr: number of @ports 20929e5f399fSJiri Slaby * @co: console to search for 20939e5f399fSJiri Slaby * Returns: uart_port for the console @co 20949e5f399fSJiri Slaby * 20959e5f399fSJiri Slaby * Check whether an invalid uart number has been specified (as @co->index), and 20969e5f399fSJiri Slaby * if so, search for the first available port that does have console support. 2097ab4382d2SGreg Kroah-Hartman */ 2098ab4382d2SGreg Kroah-Hartman struct uart_port * __init 2099ab4382d2SGreg Kroah-Hartman uart_get_console(struct uart_port *ports, int nr, struct console *co) 2100ab4382d2SGreg Kroah-Hartman { 2101ab4382d2SGreg Kroah-Hartman int idx = co->index; 2102ab4382d2SGreg Kroah-Hartman 2103ab4382d2SGreg Kroah-Hartman if (idx < 0 || idx >= nr || (ports[idx].iobase == 0 && 2104ab4382d2SGreg Kroah-Hartman ports[idx].membase == NULL)) 2105ab4382d2SGreg Kroah-Hartman for (idx = 0; idx < nr; idx++) 2106ab4382d2SGreg Kroah-Hartman if (ports[idx].iobase != 0 || 2107ab4382d2SGreg Kroah-Hartman ports[idx].membase != NULL) 2108ab4382d2SGreg Kroah-Hartman break; 2109ab4382d2SGreg Kroah-Hartman 2110ab4382d2SGreg Kroah-Hartman co->index = idx; 2111ab4382d2SGreg Kroah-Hartman 2112ab4382d2SGreg Kroah-Hartman return ports + idx; 2113ab4382d2SGreg Kroah-Hartman } 2114ab4382d2SGreg Kroah-Hartman 2115ab4382d2SGreg Kroah-Hartman /** 211673abaf87SPeter Hurley * uart_parse_earlycon - Parse earlycon options 211773abaf87SPeter Hurley * @p: ptr to 2nd field (ie., just beyond '<name>,') 211873abaf87SPeter Hurley * @iotype: ptr for decoded iotype (out) 211973abaf87SPeter Hurley * @addr: ptr for decoded mapbase/iobase (out) 2120987233b3SJiri Slaby * @options: ptr for <options> field; %NULL if not present (out) 212173abaf87SPeter Hurley * 2122987233b3SJiri Slaby * Decodes earlycon kernel command line parameters of the form: 2123987233b3SJiri Slaby * * earlycon=<name>,io|mmio|mmio16|mmio32|mmio32be|mmio32native,<addr>,<options> 2124987233b3SJiri Slaby * * console=<name>,io|mmio|mmio16|mmio32|mmio32be|mmio32native,<addr>,<options> 212573abaf87SPeter Hurley * 2126987233b3SJiri Slaby * The optional form: 2127987233b3SJiri Slaby * * earlycon=<name>,0x<addr>,<options> 2128987233b3SJiri Slaby * * console=<name>,0x<addr>,<options> 2129ff30283aSRandy Dunlap * 2130987233b3SJiri Slaby * is also accepted; the returned @iotype will be %UPIO_MEM. 2131ff30283aSRandy Dunlap * 2132987233b3SJiri Slaby * Returns: 0 on success or -%EINVAL on failure 213373abaf87SPeter Hurley */ 213446e36683SAlexander Sverdlin int uart_parse_earlycon(char *p, unsigned char *iotype, resource_size_t *addr, 213573abaf87SPeter Hurley char **options) 213673abaf87SPeter Hurley { 213773abaf87SPeter Hurley if (strncmp(p, "mmio,", 5) == 0) { 213873abaf87SPeter Hurley *iotype = UPIO_MEM; 213973abaf87SPeter Hurley p += 5; 2140bd94c407SMasahiro Yamada } else if (strncmp(p, "mmio16,", 7) == 0) { 2141bd94c407SMasahiro Yamada *iotype = UPIO_MEM16; 2142bd94c407SMasahiro Yamada p += 7; 214373abaf87SPeter Hurley } else if (strncmp(p, "mmio32,", 7) == 0) { 214473abaf87SPeter Hurley *iotype = UPIO_MEM32; 214573abaf87SPeter Hurley p += 7; 21466e63be3fSNoam Camus } else if (strncmp(p, "mmio32be,", 9) == 0) { 21476e63be3fSNoam Camus *iotype = UPIO_MEM32BE; 21486e63be3fSNoam Camus p += 9; 2149d215d809SMax Filippov } else if (strncmp(p, "mmio32native,", 13) == 0) { 2150d215d809SMax Filippov *iotype = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) ? 2151d215d809SMax Filippov UPIO_MEM32BE : UPIO_MEM32; 2152d215d809SMax Filippov p += 13; 215373abaf87SPeter Hurley } else if (strncmp(p, "io,", 3) == 0) { 215473abaf87SPeter Hurley *iotype = UPIO_PORT; 215573abaf87SPeter Hurley p += 3; 215673abaf87SPeter Hurley } else if (strncmp(p, "0x", 2) == 0) { 215773abaf87SPeter Hurley *iotype = UPIO_MEM; 215873abaf87SPeter Hurley } else { 215973abaf87SPeter Hurley return -EINVAL; 216073abaf87SPeter Hurley } 216173abaf87SPeter Hurley 21628b2303deSAlexander Sverdlin /* 21638b2303deSAlexander Sverdlin * Before you replace it with kstrtoull(), think about options separator 21648b2303deSAlexander Sverdlin * (',') it will not tolerate 21658b2303deSAlexander Sverdlin */ 21668b2303deSAlexander Sverdlin *addr = simple_strtoull(p, NULL, 0); 216773abaf87SPeter Hurley p = strchr(p, ','); 216873abaf87SPeter Hurley if (p) 216973abaf87SPeter Hurley p++; 217073abaf87SPeter Hurley 217173abaf87SPeter Hurley *options = p; 217273abaf87SPeter Hurley return 0; 217373abaf87SPeter Hurley } 217473abaf87SPeter Hurley EXPORT_SYMBOL_GPL(uart_parse_earlycon); 217573abaf87SPeter Hurley 217673abaf87SPeter Hurley /** 217702088ca6SGeert Uytterhoeven * uart_parse_options - Parse serial port baud/parity/bits/flow control. 2178ab4382d2SGreg Kroah-Hartman * @options: pointer to option string 2179ab4382d2SGreg Kroah-Hartman * @baud: pointer to an 'int' variable for the baud rate. 2180ab4382d2SGreg Kroah-Hartman * @parity: pointer to an 'int' variable for the parity. 2181ab4382d2SGreg Kroah-Hartman * @bits: pointer to an 'int' variable for the number of data bits. 2182ab4382d2SGreg Kroah-Hartman * @flow: pointer to an 'int' variable for the flow control character. 2183ab4382d2SGreg Kroah-Hartman * 2184987233b3SJiri Slaby * uart_parse_options() decodes a string containing the serial console 2185ab4382d2SGreg Kroah-Hartman * options. The format of the string is <baud><parity><bits><flow>, 2186ab4382d2SGreg Kroah-Hartman * eg: 115200n8r 2187ab4382d2SGreg Kroah-Hartman */ 2188ab4382d2SGreg Kroah-Hartman void 21890f646b63SPaul Cercueil uart_parse_options(const char *options, int *baud, int *parity, 21900f646b63SPaul Cercueil int *bits, int *flow) 2191ab4382d2SGreg Kroah-Hartman { 21920f646b63SPaul Cercueil const char *s = options; 2193ab4382d2SGreg Kroah-Hartman 2194ab4382d2SGreg Kroah-Hartman *baud = simple_strtoul(s, NULL, 10); 2195ab4382d2SGreg Kroah-Hartman while (*s >= '0' && *s <= '9') 2196ab4382d2SGreg Kroah-Hartman s++; 2197ab4382d2SGreg Kroah-Hartman if (*s) 2198ab4382d2SGreg Kroah-Hartman *parity = *s++; 2199ab4382d2SGreg Kroah-Hartman if (*s) 2200ab4382d2SGreg Kroah-Hartman *bits = *s++ - '0'; 2201ab4382d2SGreg Kroah-Hartman if (*s) 2202ab4382d2SGreg Kroah-Hartman *flow = *s; 2203ab4382d2SGreg Kroah-Hartman } 2204ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_parse_options); 2205ab4382d2SGreg Kroah-Hartman 2206ab4382d2SGreg Kroah-Hartman /** 2207ab4382d2SGreg Kroah-Hartman * uart_set_options - setup the serial console parameters 2208ab4382d2SGreg Kroah-Hartman * @port: pointer to the serial ports uart_port structure 2209ab4382d2SGreg Kroah-Hartman * @co: console pointer 2210ab4382d2SGreg Kroah-Hartman * @baud: baud rate 2211ab4382d2SGreg Kroah-Hartman * @parity: parity character - 'n' (none), 'o' (odd), 'e' (even) 2212ab4382d2SGreg Kroah-Hartman * @bits: number of data bits 2213ab4382d2SGreg Kroah-Hartman * @flow: flow control character - 'r' (rts) 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) 2452ab4382d2SGreg Kroah-Hartman uart_change_speed(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; 259349c02304SPeter Hurley struct tty_port *tport; 2594ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2595ab4382d2SGreg Kroah-Hartman int baud = 9600; 2596ab4382d2SGreg Kroah-Hartman int bits = 8; 2597ab4382d2SGreg Kroah-Hartman int parity = 'n'; 2598ab4382d2SGreg Kroah-Hartman int flow = 'n'; 259949c02304SPeter Hurley int ret = 0; 2600ab4382d2SGreg Kroah-Hartman 260149c02304SPeter Hurley tport = &state->port; 260249c02304SPeter Hurley mutex_lock(&tport->mutex); 260349c02304SPeter Hurley 26044047b371SPeter Hurley port = uart_port_check(state); 26054047b371SPeter Hurley if (!port || !(port->ops->poll_get_char && port->ops->poll_put_char)) { 260649c02304SPeter Hurley ret = -1; 260749c02304SPeter Hurley goto out; 260849c02304SPeter Hurley } 2609ab4382d2SGreg Kroah-Hartman 2610c7f3e708SAnton Vorontsov if (port->ops->poll_init) { 2611c7f3e708SAnton Vorontsov /* 2612d41861caSPeter Hurley * We don't set initialized as we only initialized the hw, 2613d41861caSPeter Hurley * e.g. state->xmit is still uninitialized. 2614c7f3e708SAnton Vorontsov */ 2615d41861caSPeter Hurley if (!tty_port_initialized(tport)) 2616c7f3e708SAnton Vorontsov ret = port->ops->poll_init(port); 2617c7f3e708SAnton Vorontsov } 2618c7f3e708SAnton Vorontsov 261949c02304SPeter Hurley if (!ret && options) { 2620ab4382d2SGreg Kroah-Hartman uart_parse_options(options, &baud, &parity, &bits, &flow); 262149c02304SPeter Hurley ret = uart_set_options(port, NULL, baud, parity, bits, flow); 2622ab4382d2SGreg Kroah-Hartman } 262349c02304SPeter Hurley out: 262449c02304SPeter Hurley mutex_unlock(&tport->mutex); 262549c02304SPeter Hurley return ret; 2626ab4382d2SGreg Kroah-Hartman } 2627ab4382d2SGreg Kroah-Hartman 2628ab4382d2SGreg Kroah-Hartman static int uart_poll_get_char(struct tty_driver *driver, int line) 2629ab4382d2SGreg Kroah-Hartman { 2630ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2631ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2632ab4382d2SGreg Kroah-Hartman struct uart_port *port; 26339ed19428SPeter Hurley int ret = -1; 2634ab4382d2SGreg Kroah-Hartman 26359ed19428SPeter Hurley port = uart_port_ref(state); 2636ef510beaSAndy Shevchenko if (port) { 26379ed19428SPeter Hurley ret = port->ops->poll_get_char(port); 26389ed19428SPeter Hurley uart_port_deref(port); 26399ed19428SPeter Hurley } 264022077b09SJiri Slaby 26419ed19428SPeter Hurley return ret; 2642ab4382d2SGreg Kroah-Hartman } 2643ab4382d2SGreg Kroah-Hartman 2644ab4382d2SGreg Kroah-Hartman static void uart_poll_put_char(struct tty_driver *driver, int line, char ch) 2645ab4382d2SGreg Kroah-Hartman { 2646ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2647ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2648ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2649ab4382d2SGreg Kroah-Hartman 26509ed19428SPeter Hurley port = uart_port_ref(state); 26519ed19428SPeter Hurley if (!port) 26529ed19428SPeter Hurley return; 2653c7d44a02SDoug Anderson 2654c7d44a02SDoug Anderson if (ch == '\n') 2655c7d44a02SDoug Anderson port->ops->poll_put_char(port, '\r'); 2656ab4382d2SGreg Kroah-Hartman port->ops->poll_put_char(port, ch); 26579ed19428SPeter Hurley uart_port_deref(port); 2658ab4382d2SGreg Kroah-Hartman } 2659ab4382d2SGreg Kroah-Hartman #endif 2660ab4382d2SGreg Kroah-Hartman 2661ab4382d2SGreg Kroah-Hartman static const struct tty_operations uart_ops = { 26624cdd17baSJiri Slaby .install = uart_install, 2663ab4382d2SGreg Kroah-Hartman .open = uart_open, 2664ab4382d2SGreg Kroah-Hartman .close = uart_close, 2665ab4382d2SGreg Kroah-Hartman .write = uart_write, 2666ab4382d2SGreg Kroah-Hartman .put_char = uart_put_char, 2667ab4382d2SGreg Kroah-Hartman .flush_chars = uart_flush_chars, 2668ab4382d2SGreg Kroah-Hartman .write_room = uart_write_room, 2669ab4382d2SGreg Kroah-Hartman .chars_in_buffer= uart_chars_in_buffer, 2670ab4382d2SGreg Kroah-Hartman .flush_buffer = uart_flush_buffer, 2671ab4382d2SGreg Kroah-Hartman .ioctl = uart_ioctl, 2672ab4382d2SGreg Kroah-Hartman .throttle = uart_throttle, 2673ab4382d2SGreg Kroah-Hartman .unthrottle = uart_unthrottle, 2674ab4382d2SGreg Kroah-Hartman .send_xchar = uart_send_xchar, 2675ab4382d2SGreg Kroah-Hartman .set_termios = uart_set_termios, 2676ab4382d2SGreg Kroah-Hartman .set_ldisc = uart_set_ldisc, 2677ab4382d2SGreg Kroah-Hartman .stop = uart_stop, 2678ab4382d2SGreg Kroah-Hartman .start = uart_start, 2679ab4382d2SGreg Kroah-Hartman .hangup = uart_hangup, 2680ab4382d2SGreg Kroah-Hartman .break_ctl = uart_break_ctl, 2681ab4382d2SGreg Kroah-Hartman .wait_until_sent= uart_wait_until_sent, 2682ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_PROC_FS 26838a8dcabfSChristoph Hellwig .proc_show = uart_proc_show, 2684ab4382d2SGreg Kroah-Hartman #endif 2685ab4382d2SGreg Kroah-Hartman .tiocmget = uart_tiocmget, 2686ab4382d2SGreg Kroah-Hartman .tiocmset = uart_tiocmset, 26875099d234SAl Viro .set_serial = uart_set_info_user, 26885099d234SAl Viro .get_serial = uart_get_info_user, 2689ab4382d2SGreg Kroah-Hartman .get_icount = uart_get_icount, 2690ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 2691ab4382d2SGreg Kroah-Hartman .poll_init = uart_poll_init, 2692ab4382d2SGreg Kroah-Hartman .poll_get_char = uart_poll_get_char, 2693ab4382d2SGreg Kroah-Hartman .poll_put_char = uart_poll_put_char, 2694ab4382d2SGreg Kroah-Hartman #endif 2695ab4382d2SGreg Kroah-Hartman }; 2696ab4382d2SGreg Kroah-Hartman 2697ab4382d2SGreg Kroah-Hartman static const struct tty_port_operations uart_port_ops = { 2698ab4382d2SGreg Kroah-Hartman .carrier_raised = uart_carrier_raised, 2699ab4382d2SGreg Kroah-Hartman .dtr_rts = uart_dtr_rts, 2700b3b57646SRob Herring .activate = uart_port_activate, 2701761ed4a9SRob Herring .shutdown = uart_tty_port_shutdown, 2702ab4382d2SGreg Kroah-Hartman }; 2703ab4382d2SGreg Kroah-Hartman 2704ab4382d2SGreg Kroah-Hartman /** 2705ab4382d2SGreg Kroah-Hartman * uart_register_driver - register a driver with the uart core layer 2706ab4382d2SGreg Kroah-Hartman * @drv: low level driver structure 2707ab4382d2SGreg Kroah-Hartman * 2708c4bd17a6SJiri Slaby * Register a uart driver with the core driver. We in turn register with the 2709c4bd17a6SJiri Slaby * tty layer, and initialise the core driver per-port state. 2710ab4382d2SGreg Kroah-Hartman * 2711c4bd17a6SJiri Slaby * We have a proc file in /proc/tty/driver which is named after the normal 2712c4bd17a6SJiri Slaby * driver. 2713ab4382d2SGreg Kroah-Hartman * 2714c4bd17a6SJiri Slaby * @drv->port should be %NULL, and the per-port structures should be registered 2715c4bd17a6SJiri Slaby * using uart_add_one_port() after this call has succeeded. 2716c4bd17a6SJiri Slaby * 2717c4bd17a6SJiri Slaby * Locking: none, Interrupts: enabled 2718ab4382d2SGreg Kroah-Hartman */ 2719ab4382d2SGreg Kroah-Hartman int uart_register_driver(struct uart_driver *drv) 2720ab4382d2SGreg Kroah-Hartman { 2721ab4382d2SGreg Kroah-Hartman struct tty_driver *normal; 2722050dfc09SSergey Organov int i, retval = -ENOMEM; 2723ab4382d2SGreg Kroah-Hartman 2724ab4382d2SGreg Kroah-Hartman BUG_ON(drv->state); 2725ab4382d2SGreg Kroah-Hartman 2726ab4382d2SGreg Kroah-Hartman /* 2727ab4382d2SGreg Kroah-Hartman * Maybe we should be using a slab cache for this, especially if 2728ab4382d2SGreg Kroah-Hartman * we have a large number of ports to handle. 2729ab4382d2SGreg Kroah-Hartman */ 27306396bb22SKees Cook drv->state = kcalloc(drv->nr, sizeof(struct uart_state), GFP_KERNEL); 2731ab4382d2SGreg Kroah-Hartman if (!drv->state) 2732ab4382d2SGreg Kroah-Hartman goto out; 2733ab4382d2SGreg Kroah-Hartman 273439b7b42bSJiri Slaby normal = tty_alloc_driver(drv->nr, TTY_DRIVER_REAL_RAW | 273539b7b42bSJiri Slaby TTY_DRIVER_DYNAMIC_DEV); 273639b7b42bSJiri Slaby if (IS_ERR(normal)) { 273739b7b42bSJiri Slaby retval = PTR_ERR(normal); 2738ab4382d2SGreg Kroah-Hartman goto out_kfree; 273939b7b42bSJiri Slaby } 2740ab4382d2SGreg Kroah-Hartman 2741ab4382d2SGreg Kroah-Hartman drv->tty_driver = normal; 2742ab4382d2SGreg Kroah-Hartman 2743ab4382d2SGreg Kroah-Hartman normal->driver_name = drv->driver_name; 2744ab4382d2SGreg Kroah-Hartman normal->name = drv->dev_name; 2745ab4382d2SGreg Kroah-Hartman normal->major = drv->major; 2746ab4382d2SGreg Kroah-Hartman normal->minor_start = drv->minor; 2747ab4382d2SGreg Kroah-Hartman normal->type = TTY_DRIVER_TYPE_SERIAL; 2748ab4382d2SGreg Kroah-Hartman normal->subtype = SERIAL_TYPE_NORMAL; 2749ab4382d2SGreg Kroah-Hartman normal->init_termios = tty_std_termios; 2750ab4382d2SGreg Kroah-Hartman normal->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; 2751ab4382d2SGreg Kroah-Hartman normal->init_termios.c_ispeed = normal->init_termios.c_ospeed = 9600; 2752ab4382d2SGreg Kroah-Hartman normal->driver_state = drv; 2753ab4382d2SGreg Kroah-Hartman tty_set_operations(normal, &uart_ops); 2754ab4382d2SGreg Kroah-Hartman 2755ab4382d2SGreg Kroah-Hartman /* 2756ab4382d2SGreg Kroah-Hartman * Initialise the UART state(s). 2757ab4382d2SGreg Kroah-Hartman */ 2758ab4382d2SGreg Kroah-Hartman for (i = 0; i < drv->nr; i++) { 2759ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + i; 2760ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2761ab4382d2SGreg Kroah-Hartman 2762ab4382d2SGreg Kroah-Hartman tty_port_init(port); 2763ab4382d2SGreg Kroah-Hartman port->ops = &uart_port_ops; 2764ab4382d2SGreg Kroah-Hartman } 2765ab4382d2SGreg Kroah-Hartman 2766ab4382d2SGreg Kroah-Hartman retval = tty_register_driver(normal); 2767ab4382d2SGreg Kroah-Hartman if (retval >= 0) 2768ab4382d2SGreg Kroah-Hartman return retval; 2769ab4382d2SGreg Kroah-Hartman 2770191c5f10SJiri Slaby for (i = 0; i < drv->nr; i++) 2771191c5f10SJiri Slaby tty_port_destroy(&drv->state[i].port); 27729f90a4ddSJiri Slaby tty_driver_kref_put(normal); 2773ab4382d2SGreg Kroah-Hartman out_kfree: 2774ab4382d2SGreg Kroah-Hartman kfree(drv->state); 2775ab4382d2SGreg Kroah-Hartman out: 2776050dfc09SSergey Organov return retval; 2777ab4382d2SGreg Kroah-Hartman } 277815dc475bSJiri Slaby EXPORT_SYMBOL(uart_register_driver); 2779ab4382d2SGreg Kroah-Hartman 2780ab4382d2SGreg Kroah-Hartman /** 2781ab4382d2SGreg Kroah-Hartman * uart_unregister_driver - remove a driver from the uart core layer 2782ab4382d2SGreg Kroah-Hartman * @drv: low level driver structure 2783ab4382d2SGreg Kroah-Hartman * 2784c4bd17a6SJiri Slaby * Remove all references to a driver from the core driver. The low level 2785c4bd17a6SJiri Slaby * driver must have removed all its ports via the uart_remove_one_port() if it 2786c4bd17a6SJiri Slaby * registered them with uart_add_one_port(). (I.e. @drv->port is %NULL.) 2787c4bd17a6SJiri Slaby * 2788c4bd17a6SJiri Slaby * Locking: none, Interrupts: enabled 2789ab4382d2SGreg Kroah-Hartman */ 2790ab4382d2SGreg Kroah-Hartman void uart_unregister_driver(struct uart_driver *drv) 2791ab4382d2SGreg Kroah-Hartman { 2792ab4382d2SGreg Kroah-Hartman struct tty_driver *p = drv->tty_driver; 2793191c5f10SJiri Slaby unsigned int i; 2794191c5f10SJiri Slaby 2795ab4382d2SGreg Kroah-Hartman tty_unregister_driver(p); 27969f90a4ddSJiri Slaby tty_driver_kref_put(p); 2797191c5f10SJiri Slaby for (i = 0; i < drv->nr; i++) 2798191c5f10SJiri Slaby tty_port_destroy(&drv->state[i].port); 2799ab4382d2SGreg Kroah-Hartman kfree(drv->state); 28001e66cdedSAlan Cox drv->state = NULL; 2801ab4382d2SGreg Kroah-Hartman drv->tty_driver = NULL; 2802ab4382d2SGreg Kroah-Hartman } 280315dc475bSJiri Slaby EXPORT_SYMBOL(uart_unregister_driver); 2804ab4382d2SGreg Kroah-Hartman 2805ab4382d2SGreg Kroah-Hartman struct tty_driver *uart_console_device(struct console *co, int *index) 2806ab4382d2SGreg Kroah-Hartman { 2807ab4382d2SGreg Kroah-Hartman struct uart_driver *p = co->data; 2808ab4382d2SGreg Kroah-Hartman *index = co->index; 2809ab4382d2SGreg Kroah-Hartman return p->tty_driver; 2810ab4382d2SGreg Kroah-Hartman } 2811488f49acSJohn Stultz EXPORT_SYMBOL_GPL(uart_console_device); 2812ab4382d2SGreg Kroah-Hartman 2813143c02c8SAndy Shevchenko static ssize_t uartclk_show(struct device *dev, 28146915c0e4STomas Hlavacek struct device_attribute *attr, char *buf) 28156915c0e4STomas Hlavacek { 2816bebe73e3SAlan Cox struct serial_struct tmp; 28176915c0e4STomas Hlavacek struct tty_port *port = dev_get_drvdata(dev); 2818b1b79916STomas Hlavacek 28199f109694SAlan Cox uart_get_info(port, &tmp); 28209cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.baud_base * 16); 28216915c0e4STomas Hlavacek } 28226915c0e4STomas Hlavacek 2823143c02c8SAndy Shevchenko static ssize_t type_show(struct device *dev, 2824373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2825373bac4cSAlan Cox { 2826373bac4cSAlan Cox struct serial_struct tmp; 2827373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2828373bac4cSAlan Cox 2829373bac4cSAlan Cox uart_get_info(port, &tmp); 28309cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.type); 2831373bac4cSAlan Cox } 2832143c02c8SAndy Shevchenko 2833143c02c8SAndy Shevchenko static ssize_t line_show(struct device *dev, 2834373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2835373bac4cSAlan Cox { 2836373bac4cSAlan Cox struct serial_struct tmp; 2837373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2838373bac4cSAlan Cox 2839373bac4cSAlan Cox uart_get_info(port, &tmp); 28409cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.line); 2841373bac4cSAlan Cox } 2842373bac4cSAlan Cox 2843143c02c8SAndy Shevchenko static ssize_t port_show(struct device *dev, 2844373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2845373bac4cSAlan Cox { 2846373bac4cSAlan Cox struct serial_struct tmp; 2847373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2848fd985e1dSAndrew Morton unsigned long ioaddr; 2849373bac4cSAlan Cox 2850373bac4cSAlan Cox uart_get_info(port, &tmp); 2851fd985e1dSAndrew Morton ioaddr = tmp.port; 2852fd985e1dSAndrew Morton if (HIGH_BITS_OFFSET) 2853fd985e1dSAndrew Morton ioaddr |= (unsigned long)tmp.port_high << HIGH_BITS_OFFSET; 28549cfbf7a6SAlex Dewar return sprintf(buf, "0x%lX\n", ioaddr); 2855373bac4cSAlan Cox } 2856373bac4cSAlan Cox 2857143c02c8SAndy Shevchenko static ssize_t irq_show(struct device *dev, 2858373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2859373bac4cSAlan Cox { 2860373bac4cSAlan Cox struct serial_struct tmp; 2861373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2862373bac4cSAlan Cox 2863373bac4cSAlan Cox uart_get_info(port, &tmp); 28649cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.irq); 2865373bac4cSAlan Cox } 2866373bac4cSAlan Cox 2867143c02c8SAndy Shevchenko static ssize_t flags_show(struct device *dev, 2868373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2869373bac4cSAlan Cox { 2870373bac4cSAlan Cox struct serial_struct tmp; 2871373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2872373bac4cSAlan Cox 2873373bac4cSAlan Cox uart_get_info(port, &tmp); 28749cfbf7a6SAlex Dewar return sprintf(buf, "0x%X\n", tmp.flags); 2875373bac4cSAlan Cox } 2876373bac4cSAlan Cox 2877143c02c8SAndy Shevchenko static ssize_t xmit_fifo_size_show(struct device *dev, 2878373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2879373bac4cSAlan Cox { 2880373bac4cSAlan Cox struct serial_struct tmp; 2881373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2882373bac4cSAlan Cox 2883373bac4cSAlan Cox uart_get_info(port, &tmp); 28849cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.xmit_fifo_size); 2885373bac4cSAlan Cox } 2886373bac4cSAlan Cox 2887143c02c8SAndy Shevchenko static ssize_t close_delay_show(struct device *dev, 2888373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2889373bac4cSAlan Cox { 2890373bac4cSAlan Cox struct serial_struct tmp; 2891373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2892373bac4cSAlan Cox 2893373bac4cSAlan Cox uart_get_info(port, &tmp); 28949cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.close_delay); 2895373bac4cSAlan Cox } 2896373bac4cSAlan Cox 2897143c02c8SAndy Shevchenko static ssize_t closing_wait_show(struct device *dev, 2898373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2899373bac4cSAlan Cox { 2900373bac4cSAlan Cox struct serial_struct tmp; 2901373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2902373bac4cSAlan Cox 2903373bac4cSAlan Cox uart_get_info(port, &tmp); 29049cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.closing_wait); 2905373bac4cSAlan Cox } 2906373bac4cSAlan Cox 2907143c02c8SAndy Shevchenko static ssize_t custom_divisor_show(struct device *dev, 2908373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2909373bac4cSAlan Cox { 2910373bac4cSAlan Cox struct serial_struct tmp; 2911373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2912373bac4cSAlan Cox 2913373bac4cSAlan Cox uart_get_info(port, &tmp); 29149cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.custom_divisor); 2915373bac4cSAlan Cox } 2916373bac4cSAlan Cox 2917143c02c8SAndy Shevchenko static ssize_t io_type_show(struct device *dev, 2918373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2919373bac4cSAlan Cox { 2920373bac4cSAlan Cox struct serial_struct tmp; 2921373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2922373bac4cSAlan Cox 2923373bac4cSAlan Cox uart_get_info(port, &tmp); 29249cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.io_type); 2925373bac4cSAlan Cox } 2926373bac4cSAlan Cox 2927143c02c8SAndy Shevchenko static ssize_t iomem_base_show(struct device *dev, 2928373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2929373bac4cSAlan Cox { 2930373bac4cSAlan Cox struct serial_struct tmp; 2931373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2932373bac4cSAlan Cox 2933373bac4cSAlan Cox uart_get_info(port, &tmp); 29349cfbf7a6SAlex Dewar return sprintf(buf, "0x%lX\n", (unsigned long)tmp.iomem_base); 2935373bac4cSAlan Cox } 2936373bac4cSAlan Cox 2937143c02c8SAndy Shevchenko static ssize_t iomem_reg_shift_show(struct device *dev, 2938373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2939373bac4cSAlan Cox { 2940373bac4cSAlan Cox struct serial_struct tmp; 2941373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2942373bac4cSAlan Cox 2943373bac4cSAlan Cox uart_get_info(port, &tmp); 29449cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.iomem_reg_shift); 2945373bac4cSAlan Cox } 2946373bac4cSAlan Cox 2947a3cb39d2SAndy Shevchenko static ssize_t console_show(struct device *dev, 2948a3cb39d2SAndy Shevchenko struct device_attribute *attr, char *buf) 2949a3cb39d2SAndy Shevchenko { 2950a3cb39d2SAndy Shevchenko struct tty_port *port = dev_get_drvdata(dev); 2951a3cb39d2SAndy Shevchenko struct uart_state *state = container_of(port, struct uart_state, port); 2952a3cb39d2SAndy Shevchenko struct uart_port *uport; 2953a3cb39d2SAndy Shevchenko bool console = false; 2954a3cb39d2SAndy Shevchenko 2955a3cb39d2SAndy Shevchenko mutex_lock(&port->mutex); 2956a3cb39d2SAndy Shevchenko uport = uart_port_check(state); 2957a3cb39d2SAndy Shevchenko if (uport) 2958452b9b24SJohn Ogness console = uart_console_registered(uport); 2959a3cb39d2SAndy Shevchenko mutex_unlock(&port->mutex); 2960a3cb39d2SAndy Shevchenko 2961a3cb39d2SAndy Shevchenko return sprintf(buf, "%c\n", console ? 'Y' : 'N'); 2962a3cb39d2SAndy Shevchenko } 2963a3cb39d2SAndy Shevchenko 2964a3cb39d2SAndy Shevchenko static ssize_t console_store(struct device *dev, 2965a3cb39d2SAndy Shevchenko struct device_attribute *attr, const char *buf, size_t count) 2966a3cb39d2SAndy Shevchenko { 2967a3cb39d2SAndy Shevchenko struct tty_port *port = dev_get_drvdata(dev); 2968a3cb39d2SAndy Shevchenko struct uart_state *state = container_of(port, struct uart_state, port); 2969a3cb39d2SAndy Shevchenko struct uart_port *uport; 2970a3cb39d2SAndy Shevchenko bool oldconsole, newconsole; 2971a3cb39d2SAndy Shevchenko int ret; 2972a3cb39d2SAndy Shevchenko 2973a3cb39d2SAndy Shevchenko ret = kstrtobool(buf, &newconsole); 2974a3cb39d2SAndy Shevchenko if (ret) 2975a3cb39d2SAndy Shevchenko return ret; 2976a3cb39d2SAndy Shevchenko 2977a3cb39d2SAndy Shevchenko mutex_lock(&port->mutex); 2978a3cb39d2SAndy Shevchenko uport = uart_port_check(state); 2979a3cb39d2SAndy Shevchenko if (uport) { 2980452b9b24SJohn Ogness oldconsole = uart_console_registered(uport); 2981a3cb39d2SAndy Shevchenko if (oldconsole && !newconsole) { 2982a3cb39d2SAndy Shevchenko ret = unregister_console(uport->cons); 2983a3cb39d2SAndy Shevchenko } else if (!oldconsole && newconsole) { 2984e0830dbfSJohan Hovold if (uart_console(uport)) { 2985e0830dbfSJohan Hovold uport->console_reinit = 1; 2986a3cb39d2SAndy Shevchenko register_console(uport->cons); 2987e0830dbfSJohan Hovold } else { 2988a3cb39d2SAndy Shevchenko ret = -ENOENT; 2989a3cb39d2SAndy Shevchenko } 2990e0830dbfSJohan Hovold } 2991a3cb39d2SAndy Shevchenko } else { 2992a3cb39d2SAndy Shevchenko ret = -ENXIO; 2993a3cb39d2SAndy Shevchenko } 2994a3cb39d2SAndy Shevchenko mutex_unlock(&port->mutex); 2995a3cb39d2SAndy Shevchenko 2996a3cb39d2SAndy Shevchenko return ret < 0 ? ret : count; 2997a3cb39d2SAndy Shevchenko } 2998a3cb39d2SAndy Shevchenko 2999143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(uartclk); 3000143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(type); 3001143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(line); 3002143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(port); 3003143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(irq); 3004143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(flags); 3005143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(xmit_fifo_size); 3006143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(close_delay); 3007143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(closing_wait); 3008143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(custom_divisor); 3009143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(io_type); 3010143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(iomem_base); 3011143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(iomem_reg_shift); 3012a3cb39d2SAndy Shevchenko static DEVICE_ATTR_RW(console); 30136915c0e4STomas Hlavacek 30146915c0e4STomas Hlavacek static struct attribute *tty_dev_attrs[] = { 3015143c02c8SAndy Shevchenko &dev_attr_uartclk.attr, 3016373bac4cSAlan Cox &dev_attr_type.attr, 3017373bac4cSAlan Cox &dev_attr_line.attr, 3018373bac4cSAlan Cox &dev_attr_port.attr, 3019373bac4cSAlan Cox &dev_attr_irq.attr, 3020373bac4cSAlan Cox &dev_attr_flags.attr, 3021373bac4cSAlan Cox &dev_attr_xmit_fifo_size.attr, 3022373bac4cSAlan Cox &dev_attr_close_delay.attr, 3023373bac4cSAlan Cox &dev_attr_closing_wait.attr, 3024373bac4cSAlan Cox &dev_attr_custom_divisor.attr, 3025373bac4cSAlan Cox &dev_attr_io_type.attr, 3026373bac4cSAlan Cox &dev_attr_iomem_base.attr, 3027373bac4cSAlan Cox &dev_attr_iomem_reg_shift.attr, 3028a3cb39d2SAndy Shevchenko &dev_attr_console.attr, 3029a3cb39d2SAndy Shevchenko NULL 30306915c0e4STomas Hlavacek }; 30316915c0e4STomas Hlavacek 3032b1b79916STomas Hlavacek static const struct attribute_group tty_dev_attr_group = { 30336915c0e4STomas Hlavacek .attrs = tty_dev_attrs, 30346915c0e4STomas Hlavacek }; 30356915c0e4STomas Hlavacek 3036ab4382d2SGreg Kroah-Hartman /** 3037ab4382d2SGreg Kroah-Hartman * uart_add_one_port - attach a driver-defined port structure 3038ab4382d2SGreg Kroah-Hartman * @drv: pointer to the uart low level driver structure for this port 3039ab4382d2SGreg Kroah-Hartman * @uport: uart port structure to use for this port. 3040ab4382d2SGreg Kroah-Hartman * 3041a157270fSAhmed S. Darwish * Context: task context, might sleep 3042a157270fSAhmed S. Darwish * 3043c4bd17a6SJiri Slaby * This allows the driver @drv to register its own uart_port structure with the 3044c4bd17a6SJiri Slaby * core driver. The main purpose is to allow the low level uart drivers to 3045c4bd17a6SJiri Slaby * expand uart_port, rather than having yet more levels of structures. 3046ab4382d2SGreg Kroah-Hartman */ 3047ab4382d2SGreg Kroah-Hartman int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport) 3048ab4382d2SGreg Kroah-Hartman { 3049ab4382d2SGreg Kroah-Hartman struct uart_state *state; 3050ab4382d2SGreg Kroah-Hartman struct tty_port *port; 3051ab4382d2SGreg Kroah-Hartman int ret = 0; 3052ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 3053266dcff0SGreg Kroah-Hartman int num_groups; 3054ab4382d2SGreg Kroah-Hartman 3055ab4382d2SGreg Kroah-Hartman if (uport->line >= drv->nr) 3056ab4382d2SGreg Kroah-Hartman return -EINVAL; 3057ab4382d2SGreg Kroah-Hartman 3058ab4382d2SGreg Kroah-Hartman state = drv->state + uport->line; 3059ab4382d2SGreg Kroah-Hartman port = &state->port; 3060ab4382d2SGreg Kroah-Hartman 3061ab4382d2SGreg Kroah-Hartman mutex_lock(&port_mutex); 3062ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 3063ab4382d2SGreg Kroah-Hartman if (state->uart_port) { 3064ab4382d2SGreg Kroah-Hartman ret = -EINVAL; 3065ab4382d2SGreg Kroah-Hartman goto out; 3066ab4382d2SGreg Kroah-Hartman } 3067ab4382d2SGreg Kroah-Hartman 30682b702b9bSPeter Hurley /* Link the port to the driver state table and vice versa */ 30699ed19428SPeter Hurley atomic_set(&state->refcount, 1); 30709ed19428SPeter Hurley init_waitqueue_head(&state->remove_wait); 3071ab4382d2SGreg Kroah-Hartman state->uart_port = uport; 3072ab4382d2SGreg Kroah-Hartman uport->state = state; 3073ab4382d2SGreg Kroah-Hartman 30742b702b9bSPeter Hurley state->pm_state = UART_PM_STATE_UNDEFINED; 30752b702b9bSPeter Hurley uport->cons = drv->cons; 3076959801feSPeter Hurley uport->minor = drv->tty_driver->minor_start + uport->line; 3077f7048b15SVignesh R uport->name = kasprintf(GFP_KERNEL, "%s%d", drv->dev_name, 3078f7048b15SVignesh R drv->tty_driver->name_base + uport->line); 3079f7048b15SVignesh R if (!uport->name) { 3080f7048b15SVignesh R ret = -ENOMEM; 3081f7048b15SVignesh R goto out; 3082f7048b15SVignesh R } 30832b702b9bSPeter Hurley 3084fe88c648SJohan Hovold /* 3085fe88c648SJohan Hovold * If this port is in use as a console then the spinlock is already 3086fe88c648SJohan Hovold * initialised. 3087fe88c648SJohan Hovold */ 3088452b9b24SJohn Ogness if (!uart_console_registered(uport)) 3089d2403cadSAndy Shevchenko uart_port_spin_lock_init(uport); 3090d2403cadSAndy Shevchenko 3091a208ffd2SGrant Likely if (uport->cons && uport->dev) 3092dd8b7a1dSMichal Simek of_console_check(uport->dev->of_node, uport->cons->name, uport->line); 3093ab4382d2SGreg Kroah-Hartman 3094fb2b9001SSudip Mukherjee tty_port_link_device(port, drv->tty_driver, uport->line); 3095ab4382d2SGreg Kroah-Hartman uart_configure_port(drv, state, uport); 3096ab4382d2SGreg Kroah-Hartman 30974dda864dSGeert Uytterhoeven port->console = uart_console(uport); 30984dda864dSGeert Uytterhoeven 3099266dcff0SGreg Kroah-Hartman num_groups = 2; 3100266dcff0SGreg Kroah-Hartman if (uport->attr_group) 3101266dcff0SGreg Kroah-Hartman num_groups++; 3102266dcff0SGreg Kroah-Hartman 3103c2b703b8SYoshihiro YUNOMAE uport->tty_groups = kcalloc(num_groups, sizeof(*uport->tty_groups), 3104266dcff0SGreg Kroah-Hartman GFP_KERNEL); 3105266dcff0SGreg Kroah-Hartman if (!uport->tty_groups) { 3106266dcff0SGreg Kroah-Hartman ret = -ENOMEM; 3107266dcff0SGreg Kroah-Hartman goto out; 3108266dcff0SGreg Kroah-Hartman } 3109266dcff0SGreg Kroah-Hartman uport->tty_groups[0] = &tty_dev_attr_group; 3110266dcff0SGreg Kroah-Hartman if (uport->attr_group) 3111266dcff0SGreg Kroah-Hartman uport->tty_groups[1] = uport->attr_group; 3112266dcff0SGreg Kroah-Hartman 3113ab4382d2SGreg Kroah-Hartman /* 3114ab4382d2SGreg Kroah-Hartman * Register the port whether it's detected or not. This allows 3115015355b7SGeert Uytterhoeven * setserial to be used to alter this port's parameters. 3116ab4382d2SGreg Kroah-Hartman */ 3117da4c2799SJohan Hovold tty_dev = tty_port_register_device_attr_serdev(port, drv->tty_driver, 3118266dcff0SGreg Kroah-Hartman uport->line, uport->dev, port, uport->tty_groups); 3119b289c496SChengguang Xu if (!IS_ERR(tty_dev)) { 312077359835SSimon Glass device_set_wakeup_capable(tty_dev, 1); 312177359835SSimon Glass } else { 31222f2dafe7SSudip Mukherjee dev_err(uport->dev, "Cannot register tty device on line %d\n", 3123ab4382d2SGreg Kroah-Hartman uport->line); 312477359835SSimon Glass } 3125ab4382d2SGreg Kroah-Hartman 3126ab4382d2SGreg Kroah-Hartman /* 3127ab4382d2SGreg Kroah-Hartman * Ensure UPF_DEAD is not set. 3128ab4382d2SGreg Kroah-Hartman */ 3129ab4382d2SGreg Kroah-Hartman uport->flags &= ~UPF_DEAD; 3130ab4382d2SGreg Kroah-Hartman 3131ab4382d2SGreg Kroah-Hartman out: 3132ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 3133ab4382d2SGreg Kroah-Hartman mutex_unlock(&port_mutex); 3134ab4382d2SGreg Kroah-Hartman 3135ab4382d2SGreg Kroah-Hartman return ret; 3136ab4382d2SGreg Kroah-Hartman } 313715dc475bSJiri Slaby EXPORT_SYMBOL(uart_add_one_port); 3138ab4382d2SGreg Kroah-Hartman 3139ab4382d2SGreg Kroah-Hartman /** 3140ab4382d2SGreg Kroah-Hartman * uart_remove_one_port - detach a driver defined port structure 3141ab4382d2SGreg Kroah-Hartman * @drv: pointer to the uart low level driver structure for this port 3142ab4382d2SGreg Kroah-Hartman * @uport: uart port structure for this port 3143ab4382d2SGreg Kroah-Hartman * 3144a157270fSAhmed S. Darwish * Context: task context, might sleep 3145a157270fSAhmed S. Darwish * 3146c4bd17a6SJiri Slaby * This unhooks (and hangs up) the specified port structure from the core 3147c4bd17a6SJiri Slaby * driver. No further calls will be made to the low-level code for this port. 3148ab4382d2SGreg Kroah-Hartman */ 3149ab4382d2SGreg Kroah-Hartman int uart_remove_one_port(struct uart_driver *drv, struct uart_port *uport) 3150ab4382d2SGreg Kroah-Hartman { 3151ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 3152ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 31534047b371SPeter Hurley struct uart_port *uart_port; 31544c6d5b4dSGeert Uytterhoeven struct tty_struct *tty; 3155b342dd51SChen Gang int ret = 0; 3156ab4382d2SGreg Kroah-Hartman 3157ab4382d2SGreg Kroah-Hartman mutex_lock(&port_mutex); 3158ab4382d2SGreg Kroah-Hartman 3159ab4382d2SGreg Kroah-Hartman /* 3160ab4382d2SGreg Kroah-Hartman * Mark the port "dead" - this prevents any opens from 3161ab4382d2SGreg Kroah-Hartman * succeeding while we shut down the port. 3162ab4382d2SGreg Kroah-Hartman */ 3163ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 31644047b371SPeter Hurley uart_port = uart_port_check(state); 31654047b371SPeter Hurley if (uart_port != uport) 31664047b371SPeter Hurley dev_alert(uport->dev, "Removing wrong port: %p != %p\n", 31674047b371SPeter Hurley uart_port, uport); 31684047b371SPeter Hurley 31694047b371SPeter Hurley if (!uart_port) { 3170b342dd51SChen Gang mutex_unlock(&port->mutex); 3171b342dd51SChen Gang ret = -EINVAL; 3172b342dd51SChen Gang goto out; 3173b342dd51SChen Gang } 3174ab4382d2SGreg Kroah-Hartman uport->flags |= UPF_DEAD; 3175ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 3176ab4382d2SGreg Kroah-Hartman 3177ab4382d2SGreg Kroah-Hartman /* 3178ab4382d2SGreg Kroah-Hartman * Remove the devices from the tty layer 3179ab4382d2SGreg Kroah-Hartman */ 3180da4c2799SJohan Hovold tty_port_unregister_device(port, drv->tty_driver, uport->line); 3181ab4382d2SGreg Kroah-Hartman 31824c6d5b4dSGeert Uytterhoeven tty = tty_port_tty_get(port); 31834c6d5b4dSGeert Uytterhoeven if (tty) { 3184ab4382d2SGreg Kroah-Hartman tty_vhangup(port->tty); 31854c6d5b4dSGeert Uytterhoeven tty_kref_put(tty); 31864c6d5b4dSGeert Uytterhoeven } 3187ab4382d2SGreg Kroah-Hartman 3188ab4382d2SGreg Kroah-Hartman /* 31895f5c9ae5SGeert Uytterhoeven * If the port is used as a console, unregister it 31905f5c9ae5SGeert Uytterhoeven */ 31915f5c9ae5SGeert Uytterhoeven if (uart_console(uport)) 31925f5c9ae5SGeert Uytterhoeven unregister_console(uport->cons); 31935f5c9ae5SGeert Uytterhoeven 31945f5c9ae5SGeert Uytterhoeven /* 3195ab4382d2SGreg Kroah-Hartman * Free the port IO and memory resources, if any. 3196ab4382d2SGreg Kroah-Hartman */ 3197a7cfaf16SFabio Estevam if (uport->type != PORT_UNKNOWN && uport->ops->release_port) 3198ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 3199266dcff0SGreg Kroah-Hartman kfree(uport->tty_groups); 3200f7048b15SVignesh R kfree(uport->name); 3201ab4382d2SGreg Kroah-Hartman 3202ab4382d2SGreg Kroah-Hartman /* 3203ab4382d2SGreg Kroah-Hartman * Indicate that there isn't a port here anymore. 3204ab4382d2SGreg Kroah-Hartman */ 3205ab4382d2SGreg Kroah-Hartman uport->type = PORT_UNKNOWN; 3206ab4382d2SGreg Kroah-Hartman 32074047b371SPeter Hurley mutex_lock(&port->mutex); 32089ed19428SPeter Hurley WARN_ON(atomic_dec_return(&state->refcount) < 0); 32099ed19428SPeter Hurley wait_event(state->remove_wait, !atomic_read(&state->refcount)); 3210ab4382d2SGreg Kroah-Hartman state->uart_port = NULL; 32114047b371SPeter Hurley mutex_unlock(&port->mutex); 3212b342dd51SChen Gang out: 3213ab4382d2SGreg Kroah-Hartman mutex_unlock(&port_mutex); 3214ab4382d2SGreg Kroah-Hartman 3215b342dd51SChen Gang return ret; 3216ab4382d2SGreg Kroah-Hartman } 321715dc475bSJiri Slaby EXPORT_SYMBOL(uart_remove_one_port); 3218ab4382d2SGreg Kroah-Hartman 3219c4bd17a6SJiri Slaby /** 3220c4bd17a6SJiri Slaby * uart_match_port - are the two ports equivalent? 3221c4bd17a6SJiri Slaby * @port1: first port 3222c4bd17a6SJiri Slaby * @port2: second port 3223c4bd17a6SJiri Slaby * 3224c4bd17a6SJiri Slaby * This utility function can be used to determine whether two uart_port 3225c4bd17a6SJiri Slaby * structures describe the same port. 3226ab4382d2SGreg Kroah-Hartman */ 3227b8be5db5SJiri Slaby bool uart_match_port(const struct uart_port *port1, 3228b8be5db5SJiri Slaby const struct uart_port *port2) 3229ab4382d2SGreg Kroah-Hartman { 3230ab4382d2SGreg Kroah-Hartman if (port1->iotype != port2->iotype) 3231b8be5db5SJiri Slaby return false; 3232ab4382d2SGreg Kroah-Hartman 3233ab4382d2SGreg Kroah-Hartman switch (port1->iotype) { 3234ab4382d2SGreg Kroah-Hartman case UPIO_PORT: 3235b8be5db5SJiri Slaby return port1->iobase == port2->iobase; 3236ab4382d2SGreg Kroah-Hartman case UPIO_HUB6: 3237b8be5db5SJiri Slaby return port1->iobase == port2->iobase && 3238b8be5db5SJiri Slaby port1->hub6 == port2->hub6; 3239ab4382d2SGreg Kroah-Hartman case UPIO_MEM: 3240bd94c407SMasahiro Yamada case UPIO_MEM16: 3241ab4382d2SGreg Kroah-Hartman case UPIO_MEM32: 32423ffb1a81SKevin Cernekee case UPIO_MEM32BE: 3243ab4382d2SGreg Kroah-Hartman case UPIO_AU: 3244ab4382d2SGreg Kroah-Hartman case UPIO_TSI: 3245b8be5db5SJiri Slaby return port1->mapbase == port2->mapbase; 3246ab4382d2SGreg Kroah-Hartman } 3247b8be5db5SJiri Slaby 3248b8be5db5SJiri Slaby return false; 3249ab4382d2SGreg Kroah-Hartman } 3250ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_match_port); 3251ab4382d2SGreg Kroah-Hartman 3252027d7dacSJiri Slaby /** 3253027d7dacSJiri Slaby * uart_handle_dcd_change - handle a change of carrier detect state 3254027d7dacSJiri Slaby * @uport: uart_port structure for the open port 3255027d7dacSJiri Slaby * @status: new carrier detect status, nonzero if active 32564d90bb14SPeter Hurley * 3257987233b3SJiri Slaby * Caller must hold uport->lock. 3258027d7dacSJiri Slaby */ 3259027d7dacSJiri Slaby void uart_handle_dcd_change(struct uart_port *uport, unsigned int status) 3260027d7dacSJiri Slaby { 326142381572SGeorge Spelvin struct tty_port *port = &uport->state->port; 326243eca0aeSAlan Cox struct tty_struct *tty = port->tty; 3263c993257bSPeter Hurley struct tty_ldisc *ld; 3264027d7dacSJiri Slaby 32654d90bb14SPeter Hurley lockdep_assert_held_once(&uport->lock); 32664d90bb14SPeter Hurley 3267c993257bSPeter Hurley if (tty) { 3268c993257bSPeter Hurley ld = tty_ldisc_ref(tty); 326942381572SGeorge Spelvin if (ld) { 327042381572SGeorge Spelvin if (ld->ops->dcd_change) 3271593fb1aeSGeorge Spelvin ld->ops->dcd_change(tty, status); 327242381572SGeorge Spelvin tty_ldisc_deref(ld); 327342381572SGeorge Spelvin } 3274c993257bSPeter Hurley } 3275027d7dacSJiri Slaby 3276027d7dacSJiri Slaby uport->icount.dcd++; 3277027d7dacSJiri Slaby 3278299245a1SPeter Hurley if (uart_dcd_enabled(uport)) { 3279027d7dacSJiri Slaby if (status) 3280027d7dacSJiri Slaby wake_up_interruptible(&port->open_wait); 328143eca0aeSAlan Cox else if (tty) 328243eca0aeSAlan Cox tty_hangup(tty); 3283027d7dacSJiri Slaby } 3284027d7dacSJiri Slaby } 3285027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_handle_dcd_change); 3286027d7dacSJiri Slaby 3287027d7dacSJiri Slaby /** 3288027d7dacSJiri Slaby * uart_handle_cts_change - handle a change of clear-to-send state 3289027d7dacSJiri Slaby * @uport: uart_port structure for the open port 3290027d7dacSJiri Slaby * @status: new clear to send status, nonzero if active 32914d90bb14SPeter Hurley * 3292987233b3SJiri Slaby * Caller must hold uport->lock. 3293027d7dacSJiri Slaby */ 3294027d7dacSJiri Slaby void uart_handle_cts_change(struct uart_port *uport, unsigned int status) 3295027d7dacSJiri Slaby { 32964d90bb14SPeter Hurley lockdep_assert_held_once(&uport->lock); 32974d90bb14SPeter Hurley 3298027d7dacSJiri Slaby uport->icount.cts++; 3299027d7dacSJiri Slaby 3300391f93f2SPeter Hurley if (uart_softcts_mode(uport)) { 3301d01f4d18SPeter Hurley if (uport->hw_stopped) { 3302027d7dacSJiri Slaby if (status) { 3303d01f4d18SPeter Hurley uport->hw_stopped = 0; 3304027d7dacSJiri Slaby uport->ops->start_tx(uport); 3305027d7dacSJiri Slaby uart_write_wakeup(uport); 3306027d7dacSJiri Slaby } 3307027d7dacSJiri Slaby } else { 3308027d7dacSJiri Slaby if (!status) { 3309d01f4d18SPeter Hurley uport->hw_stopped = 1; 3310027d7dacSJiri Slaby uport->ops->stop_tx(uport); 3311027d7dacSJiri Slaby } 3312027d7dacSJiri Slaby } 3313391f93f2SPeter Hurley 3314027d7dacSJiri Slaby } 3315027d7dacSJiri Slaby } 3316027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_handle_cts_change); 3317027d7dacSJiri Slaby 3318cf75525fSJiri Slaby /** 3319cf75525fSJiri Slaby * uart_insert_char - push a char to the uart layer 3320cf75525fSJiri Slaby * 3321cf75525fSJiri Slaby * User is responsible to call tty_flip_buffer_push when they are done with 3322cf75525fSJiri Slaby * insertion. 3323cf75525fSJiri Slaby * 3324cf75525fSJiri Slaby * @port: corresponding port 3325cf75525fSJiri Slaby * @status: state of the serial port RX buffer (LSR for 8250) 3326cf75525fSJiri Slaby * @overrun: mask of overrun bits in @status 3327cf75525fSJiri Slaby * @ch: character to push 3328cf75525fSJiri Slaby * @flag: flag for the character (see TTY_NORMAL and friends) 3329cf75525fSJiri Slaby */ 3330027d7dacSJiri Slaby void uart_insert_char(struct uart_port *port, unsigned int status, 3331027d7dacSJiri Slaby unsigned int overrun, unsigned int ch, unsigned int flag) 3332027d7dacSJiri Slaby { 333392a19f9cSJiri Slaby struct tty_port *tport = &port->state->port; 3334027d7dacSJiri Slaby 3335027d7dacSJiri Slaby if ((status & port->ignore_status_mask & ~overrun) == 0) 333692a19f9cSJiri Slaby if (tty_insert_flip_char(tport, ch, flag) == 0) 3337dabfb351SCorbin ++port->icount.buf_overrun; 3338027d7dacSJiri Slaby 3339027d7dacSJiri Slaby /* 3340027d7dacSJiri Slaby * Overrun is special. Since it's reported immediately, 3341027d7dacSJiri Slaby * it doesn't affect the current character. 3342027d7dacSJiri Slaby */ 3343027d7dacSJiri Slaby if (status & ~port->ignore_status_mask & overrun) 334492a19f9cSJiri Slaby if (tty_insert_flip_char(tport, 0, TTY_OVERRUN) == 0) 3345dabfb351SCorbin ++port->icount.buf_overrun; 3346027d7dacSJiri Slaby } 3347027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_insert_char); 3348027d7dacSJiri Slaby 334968af4317SDmitry Safonov #ifdef CONFIG_MAGIC_SYSRQ_SERIAL 335068af4317SDmitry Safonov static const char sysrq_toggle_seq[] = CONFIG_MAGIC_SYSRQ_SERIAL_SEQUENCE; 335168af4317SDmitry Safonov 335268af4317SDmitry Safonov static void uart_sysrq_on(struct work_struct *w) 335368af4317SDmitry Safonov { 3354b18896ffSAndy Shevchenko int sysrq_toggle_seq_len = strlen(sysrq_toggle_seq); 3355b18896ffSAndy Shevchenko 335668af4317SDmitry Safonov sysrq_toggle_support(1); 3357b18896ffSAndy Shevchenko pr_info("SysRq is enabled by magic sequence '%*pE' on serial\n", 3358b18896ffSAndy Shevchenko sysrq_toggle_seq_len, sysrq_toggle_seq); 335968af4317SDmitry Safonov } 336068af4317SDmitry Safonov static DECLARE_WORK(sysrq_enable_work, uart_sysrq_on); 336168af4317SDmitry Safonov 336268af4317SDmitry Safonov /** 336368af4317SDmitry Safonov * uart_try_toggle_sysrq - Enables SysRq from serial line 336468af4317SDmitry Safonov * @port: uart_port structure where char(s) after BREAK met 336568af4317SDmitry Safonov * @ch: new character in the sequence after received BREAK 336668af4317SDmitry Safonov * 336768af4317SDmitry Safonov * Enables magic SysRq when the required sequence is met on port 336868af4317SDmitry Safonov * (see CONFIG_MAGIC_SYSRQ_SERIAL_SEQUENCE). 336968af4317SDmitry Safonov * 3370987233b3SJiri Slaby * Returns: %false if @ch is out of enabling sequence and should be 3371987233b3SJiri Slaby * handled some other way, %true if @ch was consumed. 337268af4317SDmitry Safonov */ 337308d54703SJohan Hovold bool uart_try_toggle_sysrq(struct uart_port *port, unsigned int ch) 337468af4317SDmitry Safonov { 33752ce5eaceSAndy Shevchenko int sysrq_toggle_seq_len = strlen(sysrq_toggle_seq); 33762ce5eaceSAndy Shevchenko 33772ce5eaceSAndy Shevchenko if (!sysrq_toggle_seq_len) 337868af4317SDmitry Safonov return false; 337968af4317SDmitry Safonov 338068af4317SDmitry Safonov BUILD_BUG_ON(ARRAY_SIZE(sysrq_toggle_seq) >= U8_MAX); 338168af4317SDmitry Safonov if (sysrq_toggle_seq[port->sysrq_seq] != ch) { 338268af4317SDmitry Safonov port->sysrq_seq = 0; 338368af4317SDmitry Safonov return false; 338468af4317SDmitry Safonov } 338568af4317SDmitry Safonov 33862ce5eaceSAndy Shevchenko if (++port->sysrq_seq < sysrq_toggle_seq_len) { 338768af4317SDmitry Safonov port->sysrq = jiffies + SYSRQ_TIMEOUT; 338868af4317SDmitry Safonov return true; 338968af4317SDmitry Safonov } 339068af4317SDmitry Safonov 339168af4317SDmitry Safonov schedule_work(&sysrq_enable_work); 339268af4317SDmitry Safonov 339368af4317SDmitry Safonov port->sysrq = 0; 339468af4317SDmitry Safonov return true; 339568af4317SDmitry Safonov } 339608d54703SJohan Hovold EXPORT_SYMBOL_GPL(uart_try_toggle_sysrq); 339768af4317SDmitry Safonov #endif 339868af4317SDmitry Safonov 3399ef838a81SUwe Kleine-König /** 3400743f93f8SLukas Wunner * uart_get_rs485_mode() - retrieve rs485 properties for given uart 3401a7172561SRandy Dunlap * @port: uart device's target port 3402ef838a81SUwe Kleine-König * 3403ef838a81SUwe Kleine-König * This function implements the device tree binding described in 3404ef838a81SUwe Kleine-König * Documentation/devicetree/bindings/serial/rs485.txt. 3405ef838a81SUwe Kleine-König */ 3406c150c0f3SLukas Wunner int uart_get_rs485_mode(struct uart_port *port) 3407ef838a81SUwe Kleine-König { 3408c150c0f3SLukas Wunner struct serial_rs485 *rs485conf = &port->rs485; 3409c150c0f3SLukas Wunner struct device *dev = port->dev; 3410ef838a81SUwe Kleine-König u32 rs485_delay[2]; 3411ef838a81SUwe Kleine-König int ret; 3412163f080eSChristoph Niedermaier int rx_during_tx_gpio_flag; 3413ef838a81SUwe Kleine-König 3414743f93f8SLukas Wunner ret = device_property_read_u32_array(dev, "rs485-rts-delay", 3415743f93f8SLukas Wunner rs485_delay, 2); 3416ef838a81SUwe Kleine-König if (!ret) { 3417ef838a81SUwe Kleine-König rs485conf->delay_rts_before_send = rs485_delay[0]; 3418ef838a81SUwe Kleine-König rs485conf->delay_rts_after_send = rs485_delay[1]; 3419ef838a81SUwe Kleine-König } else { 3420ef838a81SUwe Kleine-König rs485conf->delay_rts_before_send = 0; 3421ef838a81SUwe Kleine-König rs485conf->delay_rts_after_send = 0; 3422ef838a81SUwe Kleine-König } 3423ef838a81SUwe Kleine-König 34244dfd1035SLino Sanfilippo uart_sanitize_serial_rs485_delays(port, rs485conf); 34254dfd1035SLino Sanfilippo 3426ef838a81SUwe Kleine-König /* 3427f1e5b618SLukas Wunner * Clear full-duplex and enabled flags, set RTS polarity to active high 3428f1e5b618SLukas Wunner * to get to a defined state with the following properties: 3429ef838a81SUwe Kleine-König */ 3430f1e5b618SLukas Wunner rs485conf->flags &= ~(SER_RS485_RX_DURING_TX | SER_RS485_ENABLED | 3431d58a2df3SLukas Wunner SER_RS485_TERMINATE_BUS | 3432f1e5b618SLukas Wunner SER_RS485_RTS_AFTER_SEND); 3433f1e5b618SLukas Wunner rs485conf->flags |= SER_RS485_RTS_ON_SEND; 3434ef838a81SUwe Kleine-König 3435743f93f8SLukas Wunner if (device_property_read_bool(dev, "rs485-rx-during-tx")) 3436ef838a81SUwe Kleine-König rs485conf->flags |= SER_RS485_RX_DURING_TX; 3437ef838a81SUwe Kleine-König 3438743f93f8SLukas Wunner if (device_property_read_bool(dev, "linux,rs485-enabled-at-boot-time")) 3439ef838a81SUwe Kleine-König rs485conf->flags |= SER_RS485_ENABLED; 3440f1e5b618SLukas Wunner 3441f1e5b618SLukas Wunner if (device_property_read_bool(dev, "rs485-rts-active-low")) { 3442f1e5b618SLukas Wunner rs485conf->flags &= ~SER_RS485_RTS_ON_SEND; 3443f1e5b618SLukas Wunner rs485conf->flags |= SER_RS485_RTS_AFTER_SEND; 3444f1e5b618SLukas Wunner } 3445c150c0f3SLukas Wunner 3446d58a2df3SLukas Wunner /* 3447d58a2df3SLukas Wunner * Disabling termination by default is the safe choice: Else if many 3448d58a2df3SLukas Wunner * bus participants enable it, no communication is possible at all. 3449d58a2df3SLukas Wunner * Works fine for short cables and users may enable for longer cables. 3450d58a2df3SLukas Wunner */ 3451d58a2df3SLukas Wunner port->rs485_term_gpio = devm_gpiod_get_optional(dev, "rs485-term", 3452d58a2df3SLukas Wunner GPIOD_OUT_LOW); 3453d58a2df3SLukas Wunner if (IS_ERR(port->rs485_term_gpio)) { 3454d58a2df3SLukas Wunner ret = PTR_ERR(port->rs485_term_gpio); 3455d58a2df3SLukas Wunner port->rs485_term_gpio = NULL; 345689c65d66SKrzysztof Kozlowski return dev_err_probe(dev, ret, "Cannot get rs485-term-gpios\n"); 3457d58a2df3SLukas Wunner } 34588bec874fSIlpo Järvinen if (port->rs485_term_gpio) 34598bec874fSIlpo Järvinen port->rs485_supported.flags |= SER_RS485_TERMINATE_BUS; 3460d58a2df3SLukas Wunner 3461163f080eSChristoph Niedermaier rx_during_tx_gpio_flag = (rs485conf->flags & SER_RS485_RX_DURING_TX) ? 3462163f080eSChristoph Niedermaier GPIOD_OUT_HIGH : GPIOD_OUT_LOW; 3463163f080eSChristoph Niedermaier port->rs485_rx_during_tx_gpio = devm_gpiod_get_optional(dev, 3464163f080eSChristoph Niedermaier "rs485-rx-during-tx", 3465163f080eSChristoph Niedermaier rx_during_tx_gpio_flag); 3466163f080eSChristoph Niedermaier if (IS_ERR(port->rs485_rx_during_tx_gpio)) { 3467163f080eSChristoph Niedermaier ret = PTR_ERR(port->rs485_rx_during_tx_gpio); 3468163f080eSChristoph Niedermaier port->rs485_rx_during_tx_gpio = NULL; 3469163f080eSChristoph Niedermaier return dev_err_probe(dev, ret, "Cannot get rs485-rx-during-tx-gpios\n"); 3470163f080eSChristoph Niedermaier } 3471163f080eSChristoph Niedermaier 3472c150c0f3SLukas Wunner return 0; 3473ef838a81SUwe Kleine-König } 3474743f93f8SLukas Wunner EXPORT_SYMBOL_GPL(uart_get_rs485_mode); 3475ef838a81SUwe Kleine-König 34764f768e94SIlpo Järvinen /* Compile-time assertions for serial_rs485 layout */ 34774f768e94SIlpo Järvinen static_assert(offsetof(struct serial_rs485, padding) == 34784f768e94SIlpo Järvinen (offsetof(struct serial_rs485, delay_rts_after_send) + sizeof(__u32))); 34794f768e94SIlpo Järvinen static_assert(offsetof(struct serial_rs485, padding1) == 34804f768e94SIlpo Järvinen offsetof(struct serial_rs485, padding[1])); 34814f768e94SIlpo Järvinen static_assert((offsetof(struct serial_rs485, padding[4]) + sizeof(__u32)) == 34824f768e94SIlpo Järvinen sizeof(struct serial_rs485)); 34834f768e94SIlpo Järvinen 3484ab4382d2SGreg Kroah-Hartman MODULE_DESCRIPTION("Serial driver core"); 3485ab4382d2SGreg Kroah-Hartman MODULE_LICENSE("GPL"); 3486