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, 52ab4382d2SGreg Kroah-Hartman 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 100ab4382d2SGreg Kroah-Hartman /* 101ab4382d2SGreg Kroah-Hartman * This routine is used by the interrupt handler to schedule processing in 102ab4382d2SGreg Kroah-Hartman * the software interrupt portion of the driver. 103ab4382d2SGreg Kroah-Hartman */ 104ab4382d2SGreg Kroah-Hartman void uart_write_wakeup(struct uart_port *port) 105ab4382d2SGreg Kroah-Hartman { 106ab4382d2SGreg Kroah-Hartman struct uart_state *state = port->state; 107ab4382d2SGreg Kroah-Hartman /* 108ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 109ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 110ab4382d2SGreg Kroah-Hartman */ 111ab4382d2SGreg Kroah-Hartman BUG_ON(!state); 112d0f4bce2SRob Herring tty_port_tty_wakeup(&state->port); 113ab4382d2SGreg Kroah-Hartman } 11415dc475bSJiri Slaby EXPORT_SYMBOL(uart_write_wakeup); 115ab4382d2SGreg Kroah-Hartman 116ab4382d2SGreg Kroah-Hartman static void uart_stop(struct tty_struct *tty) 117ab4382d2SGreg Kroah-Hartman { 118ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1199ed19428SPeter Hurley struct uart_port *port; 120ab4382d2SGreg Kroah-Hartman unsigned long flags; 121ab4382d2SGreg Kroah-Hartman 1229ed19428SPeter Hurley port = uart_port_lock(state, flags); 1239ed19428SPeter Hurley if (port) 124ab4382d2SGreg Kroah-Hartman port->ops->stop_tx(port); 1259ed19428SPeter Hurley uart_port_unlock(port, flags); 126ab4382d2SGreg Kroah-Hartman } 127ab4382d2SGreg Kroah-Hartman 128ab4382d2SGreg Kroah-Hartman static void __uart_start(struct tty_struct *tty) 129ab4382d2SGreg Kroah-Hartman { 130ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 131ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 132ab4382d2SGreg Kroah-Hartman 1339ed19428SPeter Hurley if (port && !uart_tx_stopped(port)) 134ab4382d2SGreg Kroah-Hartman port->ops->start_tx(port); 135ab4382d2SGreg Kroah-Hartman } 136ab4382d2SGreg Kroah-Hartman 137ab4382d2SGreg Kroah-Hartman static void uart_start(struct tty_struct *tty) 138ab4382d2SGreg Kroah-Hartman { 139ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1409ed19428SPeter Hurley struct uart_port *port; 141ab4382d2SGreg Kroah-Hartman unsigned long flags; 142ab4382d2SGreg Kroah-Hartman 1439ed19428SPeter Hurley port = uart_port_lock(state, flags); 144ab4382d2SGreg Kroah-Hartman __uart_start(tty); 1459ed19428SPeter Hurley uart_port_unlock(port, flags); 146ab4382d2SGreg Kroah-Hartman } 147ab4382d2SGreg Kroah-Hartman 148f4581cabSDenys Vlasenko static void 149ab4382d2SGreg Kroah-Hartman uart_update_mctrl(struct uart_port *port, unsigned int set, unsigned int clear) 150ab4382d2SGreg Kroah-Hartman { 151ab4382d2SGreg Kroah-Hartman unsigned long flags; 152ab4382d2SGreg Kroah-Hartman unsigned int old; 153ab4382d2SGreg Kroah-Hartman 1542dd8a74fSLukas Wunner if (port->rs485.flags & SER_RS485_ENABLED) { 1552dd8a74fSLukas Wunner set &= ~TIOCM_RTS; 1562dd8a74fSLukas Wunner clear &= ~TIOCM_RTS; 1572dd8a74fSLukas Wunner } 1582dd8a74fSLukas Wunner 159ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 160ab4382d2SGreg Kroah-Hartman old = port->mctrl; 161ab4382d2SGreg Kroah-Hartman port->mctrl = (old & ~clear) | set; 162ab4382d2SGreg Kroah-Hartman if (old != port->mctrl) 163ab4382d2SGreg Kroah-Hartman port->ops->set_mctrl(port, port->mctrl); 164ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 165ab4382d2SGreg Kroah-Hartman } 166ab4382d2SGreg Kroah-Hartman 167ab4382d2SGreg Kroah-Hartman #define uart_set_mctrl(port, set) uart_update_mctrl(port, set, 0) 168ab4382d2SGreg Kroah-Hartman #define uart_clear_mctrl(port, clear) uart_update_mctrl(port, 0, clear) 169ab4382d2SGreg Kroah-Hartman 170a6845e1eSRafael Gago static void uart_port_dtr_rts(struct uart_port *uport, int raise) 171a6845e1eSRafael Gago { 1722dd8a74fSLukas Wunner if (raise) 173a6845e1eSRafael Gago uart_set_mctrl(uport, TIOCM_DTR | TIOCM_RTS); 1742dd8a74fSLukas Wunner else 1752dd8a74fSLukas Wunner uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); 176a6845e1eSRafael Gago } 177a6845e1eSRafael Gago 178ab4382d2SGreg Kroah-Hartman /* 179ab4382d2SGreg Kroah-Hartman * Startup the port. This will be called once per open. All calls 180ab4382d2SGreg Kroah-Hartman * will be serialised by the per-port mutex. 181ab4382d2SGreg Kroah-Hartman */ 182c0d92be6SJiri Slaby static int uart_port_startup(struct tty_struct *tty, struct uart_state *state, 183c0d92be6SJiri Slaby int init_hw) 184ab4382d2SGreg Kroah-Hartman { 1854047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 18618ee37e1SJohan Hovold unsigned long flags; 187ab4382d2SGreg Kroah-Hartman unsigned long page; 188ab4382d2SGreg Kroah-Hartman int retval = 0; 189ab4382d2SGreg Kroah-Hartman 190ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) 191c0d92be6SJiri Slaby return 1; 192ab4382d2SGreg Kroah-Hartman 193ab4382d2SGreg Kroah-Hartman /* 1947deb39edSThomas Pfaff * Make sure the device is in D0 state. 1957deb39edSThomas Pfaff */ 1967deb39edSThomas Pfaff uart_change_pm(state, UART_PM_STATE_ON); 1977deb39edSThomas Pfaff 1987deb39edSThomas Pfaff /* 199ab4382d2SGreg Kroah-Hartman * Initialise and allocate the transmit and temporary 200ab4382d2SGreg Kroah-Hartman * buffer. 201ab4382d2SGreg Kroah-Hartman */ 202ab4382d2SGreg Kroah-Hartman page = get_zeroed_page(GFP_KERNEL); 203ab4382d2SGreg Kroah-Hartman if (!page) 204ab4382d2SGreg Kroah-Hartman return -ENOMEM; 205ab4382d2SGreg Kroah-Hartman 206a5ba1d95STycho Andersen uart_port_lock(state, flags); 207a5ba1d95STycho Andersen if (!state->xmit.buf) { 208ab4382d2SGreg Kroah-Hartman state->xmit.buf = (unsigned char *) page; 209ab4382d2SGreg Kroah-Hartman uart_circ_clear(&state->xmit); 210d7240214SSergey Senozhatsky uart_port_unlock(uport, flags); 211a5ba1d95STycho Andersen } else { 212d7240214SSergey Senozhatsky uart_port_unlock(uport, flags); 213d7240214SSergey Senozhatsky /* 214d7240214SSergey Senozhatsky * Do not free() the page under the port lock, see 215d7240214SSergey Senozhatsky * uart_shutdown(). 216d7240214SSergey Senozhatsky */ 217a5ba1d95STycho Andersen free_page(page); 218ab4382d2SGreg Kroah-Hartman } 219ab4382d2SGreg Kroah-Hartman 220ab4382d2SGreg Kroah-Hartman retval = uport->ops->startup(uport); 221ab4382d2SGreg Kroah-Hartman if (retval == 0) { 222c7d7abffSJiri Slaby if (uart_console(uport) && uport->cons->cflag) { 223adc8d746SAlan Cox tty->termios.c_cflag = uport->cons->cflag; 224027b5717SPali Rohár tty->termios.c_ispeed = uport->cons->ispeed; 225027b5717SPali Rohár tty->termios.c_ospeed = uport->cons->ospeed; 226c7d7abffSJiri Slaby uport->cons->cflag = 0; 227027b5717SPali Rohár uport->cons->ispeed = 0; 228027b5717SPali Rohár uport->cons->ospeed = 0; 229c7d7abffSJiri Slaby } 230ab4382d2SGreg Kroah-Hartman /* 231ab4382d2SGreg Kroah-Hartman * Initialise the hardware port settings. 232ab4382d2SGreg Kroah-Hartman */ 233ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 234ab4382d2SGreg Kroah-Hartman 235ab4382d2SGreg Kroah-Hartman /* 236ab4382d2SGreg Kroah-Hartman * Setup the RTS and DTR signals once the 237ab4382d2SGreg Kroah-Hartman * port is open and ready to respond. 238ab4382d2SGreg Kroah-Hartman */ 2399db276f8SPeter Hurley if (init_hw && C_BAUD(tty)) 240a6845e1eSRafael Gago uart_port_dtr_rts(uport, 1); 241ab4382d2SGreg Kroah-Hartman } 242ab4382d2SGreg Kroah-Hartman 2430055197eSJiri Slaby /* 2440055197eSJiri Slaby * This is to allow setserial on this port. People may want to set 2450055197eSJiri Slaby * port/irq/type and then reconfigure the port properly if it failed 2460055197eSJiri Slaby * now. 2470055197eSJiri Slaby */ 248ab4382d2SGreg Kroah-Hartman if (retval && capable(CAP_SYS_ADMIN)) 249c0d92be6SJiri Slaby return 1; 250c0d92be6SJiri Slaby 251c0d92be6SJiri Slaby return retval; 252c0d92be6SJiri Slaby } 253c0d92be6SJiri Slaby 254c0d92be6SJiri Slaby static int uart_startup(struct tty_struct *tty, struct uart_state *state, 255c0d92be6SJiri Slaby int init_hw) 256c0d92be6SJiri Slaby { 257c0d92be6SJiri Slaby struct tty_port *port = &state->port; 258c0d92be6SJiri Slaby int retval; 259c0d92be6SJiri Slaby 260d41861caSPeter Hurley if (tty_port_initialized(port)) 261c0d92be6SJiri Slaby return 0; 262c0d92be6SJiri Slaby 263c0d92be6SJiri Slaby retval = uart_port_startup(tty, state, init_hw); 264b3b57646SRob Herring if (retval) 265b3b57646SRob Herring set_bit(TTY_IO_ERROR, &tty->flags); 266ab4382d2SGreg Kroah-Hartman 267ab4382d2SGreg Kroah-Hartman return retval; 268ab4382d2SGreg Kroah-Hartman } 269ab4382d2SGreg Kroah-Hartman 270ab4382d2SGreg Kroah-Hartman /* 271ab4382d2SGreg Kroah-Hartman * This routine will shutdown a serial port; interrupts are disabled, and 272ab4382d2SGreg Kroah-Hartman * DTR is dropped if the hangup on close termio flag is on. Calls to 273ab4382d2SGreg Kroah-Hartman * uart_shutdown are serialised by the per-port semaphore. 274af224ca2SPeter Hurley * 275af224ca2SPeter Hurley * uport == NULL if uart_port has already been removed 276ab4382d2SGreg Kroah-Hartman */ 277ab4382d2SGreg Kroah-Hartman static void uart_shutdown(struct tty_struct *tty, struct uart_state *state) 278ab4382d2SGreg Kroah-Hartman { 2794047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 280ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 28118ee37e1SJohan Hovold unsigned long flags; 282d7240214SSergey Senozhatsky char *xmit_buf = NULL; 283ab4382d2SGreg Kroah-Hartman 284ab4382d2SGreg Kroah-Hartman /* 285ab4382d2SGreg Kroah-Hartman * Set the TTY IO error marker 286ab4382d2SGreg Kroah-Hartman */ 287ab4382d2SGreg Kroah-Hartman if (tty) 288ab4382d2SGreg Kroah-Hartman set_bit(TTY_IO_ERROR, &tty->flags); 289ab4382d2SGreg Kroah-Hartman 290d41861caSPeter Hurley if (tty_port_initialized(port)) { 291d41861caSPeter Hurley tty_port_set_initialized(port, 0); 292d41861caSPeter Hurley 293ab4382d2SGreg Kroah-Hartman /* 294ab4382d2SGreg Kroah-Hartman * Turn off DTR and RTS early. 295ab4382d2SGreg Kroah-Hartman */ 296027b5717SPali Rohár if (uport && uart_console(uport) && tty) { 297ae84db96SPeter Hurley uport->cons->cflag = tty->termios.c_cflag; 298027b5717SPali Rohár uport->cons->ispeed = tty->termios.c_ispeed; 299027b5717SPali Rohár uport->cons->ospeed = tty->termios.c_ospeed; 300027b5717SPali Rohár } 301ae84db96SPeter Hurley 3029db276f8SPeter Hurley if (!tty || C_HUPCL(tty)) 303a6845e1eSRafael Gago uart_port_dtr_rts(uport, 0); 304ab4382d2SGreg Kroah-Hartman 305b922e19dSJiri Slaby uart_port_shutdown(port); 306ab4382d2SGreg Kroah-Hartman } 307ab4382d2SGreg Kroah-Hartman 308ab4382d2SGreg Kroah-Hartman /* 309d208a3bfSDoug Anderson * It's possible for shutdown to be called after suspend if we get 310d208a3bfSDoug Anderson * a DCD drop (hangup) at just the right time. Clear suspended bit so 311d208a3bfSDoug Anderson * we don't try to resume a port that has been shutdown. 312ab4382d2SGreg Kroah-Hartman */ 31380f02d54SPeter Hurley tty_port_set_suspended(port, 0); 314ab4382d2SGreg Kroah-Hartman 315ab4382d2SGreg Kroah-Hartman /* 316d7240214SSergey Senozhatsky * Do not free() the transmit buffer page under the port lock since 317d7240214SSergey Senozhatsky * this can create various circular locking scenarios. For instance, 318d7240214SSergey Senozhatsky * console driver may need to allocate/free a debug object, which 319d7240214SSergey Senozhatsky * can endup in printk() recursion. 320ab4382d2SGreg Kroah-Hartman */ 321a5ba1d95STycho Andersen uart_port_lock(state, flags); 322d7240214SSergey Senozhatsky xmit_buf = state->xmit.buf; 323ab4382d2SGreg Kroah-Hartman state->xmit.buf = NULL; 324a5ba1d95STycho Andersen uart_port_unlock(uport, flags); 325d7240214SSergey Senozhatsky 326d7240214SSergey Senozhatsky free_page((unsigned long)xmit_buf); 327ab4382d2SGreg Kroah-Hartman } 328ab4382d2SGreg Kroah-Hartman 329ab4382d2SGreg Kroah-Hartman /** 330*f9008285SIlpo Järvinen * uart_update_timeout - update per-port frame timing information. 331ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port 332ab4382d2SGreg Kroah-Hartman * @cflag: termios cflag value 333ab4382d2SGreg Kroah-Hartman * @baud: speed of the port 334ab4382d2SGreg Kroah-Hartman * 335*f9008285SIlpo Järvinen * Set the port frame timing information from which the FIFO timeout 336*f9008285SIlpo Järvinen * value is derived. The @cflag value should reflect the actual hardware 337*f9008285SIlpo Järvinen * settings. 338ab4382d2SGreg Kroah-Hartman */ 339ab4382d2SGreg Kroah-Hartman void 340ab4382d2SGreg Kroah-Hartman uart_update_timeout(struct uart_port *port, unsigned int cflag, 341ab4382d2SGreg Kroah-Hartman unsigned int baud) 342ab4382d2SGreg Kroah-Hartman { 34331f6bd7fSIlpo Järvinen unsigned int size = tty_get_frame_size(cflag); 34431f6bd7fSIlpo Järvinen u64 frame_time; 345ab4382d2SGreg Kroah-Hartman 34631f6bd7fSIlpo Järvinen frame_time = (u64)size * NSEC_PER_SEC; 34731f6bd7fSIlpo Järvinen port->frame_time = DIV64_U64_ROUND_UP(frame_time, baud); 348ab4382d2SGreg Kroah-Hartman } 349ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_update_timeout); 350ab4382d2SGreg Kroah-Hartman 351ab4382d2SGreg Kroah-Hartman /** 352ab4382d2SGreg Kroah-Hartman * uart_get_baud_rate - return baud rate for a particular port 353ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port in question. 354ab4382d2SGreg Kroah-Hartman * @termios: desired termios settings. 355ab4382d2SGreg Kroah-Hartman * @old: old termios (or NULL) 356ab4382d2SGreg Kroah-Hartman * @min: minimum acceptable baud rate 357ab4382d2SGreg Kroah-Hartman * @max: maximum acceptable baud rate 358ab4382d2SGreg Kroah-Hartman * 359ab4382d2SGreg Kroah-Hartman * Decode the termios structure into a numeric baud rate, 360ab4382d2SGreg Kroah-Hartman * taking account of the magic 38400 baud rate (with spd_* 361ab4382d2SGreg Kroah-Hartman * flags), and mapping the %B0 rate to 9600 baud. 362ab4382d2SGreg Kroah-Hartman * 363ab4382d2SGreg Kroah-Hartman * If the new baud rate is invalid, try the old termios setting. 364ab4382d2SGreg Kroah-Hartman * If it's still invalid, we try 9600 baud. 365ab4382d2SGreg Kroah-Hartman * 366ab4382d2SGreg Kroah-Hartman * Update the @termios structure to reflect the baud rate 367ab4382d2SGreg Kroah-Hartman * we're actually going to be using. Don't do this for the case 368ab4382d2SGreg Kroah-Hartman * where B0 is requested ("hang up"). 369ab4382d2SGreg Kroah-Hartman */ 370ab4382d2SGreg Kroah-Hartman unsigned int 371ab4382d2SGreg Kroah-Hartman uart_get_baud_rate(struct uart_port *port, struct ktermios *termios, 372ab4382d2SGreg Kroah-Hartman struct ktermios *old, unsigned int min, unsigned int max) 373ab4382d2SGreg Kroah-Hartman { 374f10a2233SJoakim Nordell unsigned int try; 375f10a2233SJoakim Nordell unsigned int baud; 376f10a2233SJoakim Nordell unsigned int altbaud; 377ab4382d2SGreg Kroah-Hartman int hung_up = 0; 378ab4382d2SGreg Kroah-Hartman upf_t flags = port->flags & UPF_SPD_MASK; 379ab4382d2SGreg Kroah-Hartman 380f10a2233SJoakim Nordell switch (flags) { 381f10a2233SJoakim Nordell case UPF_SPD_HI: 382ab4382d2SGreg Kroah-Hartman altbaud = 57600; 383f10a2233SJoakim Nordell break; 384f10a2233SJoakim Nordell case UPF_SPD_VHI: 385ab4382d2SGreg Kroah-Hartman altbaud = 115200; 386f10a2233SJoakim Nordell break; 387f10a2233SJoakim Nordell case UPF_SPD_SHI: 388ab4382d2SGreg Kroah-Hartman altbaud = 230400; 389f10a2233SJoakim Nordell break; 390f10a2233SJoakim Nordell case UPF_SPD_WARP: 391ab4382d2SGreg Kroah-Hartman altbaud = 460800; 392f10a2233SJoakim Nordell break; 393f10a2233SJoakim Nordell default: 394f10a2233SJoakim Nordell altbaud = 38400; 395f10a2233SJoakim Nordell break; 396f10a2233SJoakim Nordell } 397ab4382d2SGreg Kroah-Hartman 398ab4382d2SGreg Kroah-Hartman for (try = 0; try < 2; try++) { 399ab4382d2SGreg Kroah-Hartman baud = tty_termios_baud_rate(termios); 400ab4382d2SGreg Kroah-Hartman 401ab4382d2SGreg Kroah-Hartman /* 402ab4382d2SGreg Kroah-Hartman * The spd_hi, spd_vhi, spd_shi, spd_warp kludge... 403ab4382d2SGreg Kroah-Hartman * Die! Die! Die! 404ab4382d2SGreg Kroah-Hartman */ 405547039ecSPeter Hurley if (try == 0 && baud == 38400) 406ab4382d2SGreg Kroah-Hartman baud = altbaud; 407ab4382d2SGreg Kroah-Hartman 408ab4382d2SGreg Kroah-Hartman /* 409ab4382d2SGreg Kroah-Hartman * Special case: B0 rate. 410ab4382d2SGreg Kroah-Hartman */ 411ab4382d2SGreg Kroah-Hartman if (baud == 0) { 412ab4382d2SGreg Kroah-Hartman hung_up = 1; 413ab4382d2SGreg Kroah-Hartman baud = 9600; 414ab4382d2SGreg Kroah-Hartman } 415ab4382d2SGreg Kroah-Hartman 416ab4382d2SGreg Kroah-Hartman if (baud >= min && baud <= max) 417ab4382d2SGreg Kroah-Hartman return baud; 418ab4382d2SGreg Kroah-Hartman 419ab4382d2SGreg Kroah-Hartman /* 420ab4382d2SGreg Kroah-Hartman * Oops, the quotient was zero. Try again with 421ab4382d2SGreg Kroah-Hartman * the old baud rate if possible. 422ab4382d2SGreg Kroah-Hartman */ 423ab4382d2SGreg Kroah-Hartman termios->c_cflag &= ~CBAUD; 424ab4382d2SGreg Kroah-Hartman if (old) { 425ab4382d2SGreg Kroah-Hartman baud = tty_termios_baud_rate(old); 426ab4382d2SGreg Kroah-Hartman if (!hung_up) 427ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 428ab4382d2SGreg Kroah-Hartman baud, baud); 429ab4382d2SGreg Kroah-Hartman old = NULL; 430ab4382d2SGreg Kroah-Hartman continue; 431ab4382d2SGreg Kroah-Hartman } 432ab4382d2SGreg Kroah-Hartman 433ab4382d2SGreg Kroah-Hartman /* 434ab4382d2SGreg Kroah-Hartman * As a last resort, if the range cannot be met then clip to 435ab4382d2SGreg Kroah-Hartman * the nearest chip supported rate. 436ab4382d2SGreg Kroah-Hartman */ 437ab4382d2SGreg Kroah-Hartman if (!hung_up) { 438ab4382d2SGreg Kroah-Hartman if (baud <= min) 439ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 440ab4382d2SGreg Kroah-Hartman min + 1, min + 1); 441ab4382d2SGreg Kroah-Hartman else 442ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 443ab4382d2SGreg Kroah-Hartman max - 1, max - 1); 444ab4382d2SGreg Kroah-Hartman } 445ab4382d2SGreg Kroah-Hartman } 446ab4382d2SGreg Kroah-Hartman /* Should never happen */ 447ab4382d2SGreg Kroah-Hartman WARN_ON(1); 448ab4382d2SGreg Kroah-Hartman return 0; 449ab4382d2SGreg Kroah-Hartman } 450ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_get_baud_rate); 451ab4382d2SGreg Kroah-Hartman 452ab4382d2SGreg Kroah-Hartman /** 453ab4382d2SGreg Kroah-Hartman * uart_get_divisor - return uart clock divisor 454ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port. 455ab4382d2SGreg Kroah-Hartman * @baud: desired baud rate 456ab4382d2SGreg Kroah-Hartman * 457ab4382d2SGreg Kroah-Hartman * Calculate the uart clock divisor for the port. 458ab4382d2SGreg Kroah-Hartman */ 459ab4382d2SGreg Kroah-Hartman unsigned int 460ab4382d2SGreg Kroah-Hartman uart_get_divisor(struct uart_port *port, unsigned int baud) 461ab4382d2SGreg Kroah-Hartman { 462ab4382d2SGreg Kroah-Hartman unsigned int quot; 463ab4382d2SGreg Kroah-Hartman 464ab4382d2SGreg Kroah-Hartman /* 465ab4382d2SGreg Kroah-Hartman * Old custom speed handling. 466ab4382d2SGreg Kroah-Hartman */ 467ab4382d2SGreg Kroah-Hartman if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) 468ab4382d2SGreg Kroah-Hartman quot = port->custom_divisor; 469ab4382d2SGreg Kroah-Hartman else 47097d24634SUwe Kleine-König quot = DIV_ROUND_CLOSEST(port->uartclk, 16 * baud); 471ab4382d2SGreg Kroah-Hartman 472ab4382d2SGreg Kroah-Hartman return quot; 473ab4382d2SGreg Kroah-Hartman } 474ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_get_divisor); 475ab4382d2SGreg Kroah-Hartman 4767c8ab967SPeter Hurley /* Caller holds port mutex */ 477ab4382d2SGreg Kroah-Hartman static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, 478ab4382d2SGreg Kroah-Hartman struct ktermios *old_termios) 479ab4382d2SGreg Kroah-Hartman { 4804047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 481ab4382d2SGreg Kroah-Hartman struct ktermios *termios; 482391f93f2SPeter Hurley int hw_stopped; 483ab4382d2SGreg Kroah-Hartman 484ab4382d2SGreg Kroah-Hartman /* 485ab4382d2SGreg Kroah-Hartman * If we have no tty, termios, or the port does not exist, 486ab4382d2SGreg Kroah-Hartman * then we can't set the parameters for this port. 487ab4382d2SGreg Kroah-Hartman */ 488adc8d746SAlan Cox if (!tty || uport->type == PORT_UNKNOWN) 489ab4382d2SGreg Kroah-Hartman return; 490ab4382d2SGreg Kroah-Hartman 491adc8d746SAlan Cox termios = &tty->termios; 492c18b55fdSPeter Hurley uport->ops->set_termios(uport, termios, old_termios); 493ab4382d2SGreg Kroah-Hartman 494ab4382d2SGreg Kroah-Hartman /* 495299245a1SPeter Hurley * Set modem status enables based on termios cflag 496ab4382d2SGreg Kroah-Hartman */ 497299245a1SPeter Hurley spin_lock_irq(&uport->lock); 498ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CRTSCTS) 499299245a1SPeter Hurley uport->status |= UPSTAT_CTS_ENABLE; 500ab4382d2SGreg Kroah-Hartman else 501299245a1SPeter Hurley uport->status &= ~UPSTAT_CTS_ENABLE; 502ab4382d2SGreg Kroah-Hartman 503ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CLOCAL) 504299245a1SPeter Hurley uport->status &= ~UPSTAT_DCD_ENABLE; 505ab4382d2SGreg Kroah-Hartman else 506299245a1SPeter Hurley uport->status |= UPSTAT_DCD_ENABLE; 507391f93f2SPeter Hurley 508391f93f2SPeter Hurley /* reset sw-assisted CTS flow control based on (possibly) new mode */ 509391f93f2SPeter Hurley hw_stopped = uport->hw_stopped; 510391f93f2SPeter Hurley uport->hw_stopped = uart_softcts_mode(uport) && 511391f93f2SPeter Hurley !(uport->ops->get_mctrl(uport) & TIOCM_CTS); 512391f93f2SPeter Hurley if (uport->hw_stopped) { 513391f93f2SPeter Hurley if (!hw_stopped) 514391f93f2SPeter Hurley uport->ops->stop_tx(uport); 515391f93f2SPeter Hurley } else { 516391f93f2SPeter Hurley if (hw_stopped) 517391f93f2SPeter Hurley __uart_start(tty); 518391f93f2SPeter Hurley } 519299245a1SPeter Hurley spin_unlock_irq(&uport->lock); 520ab4382d2SGreg Kroah-Hartman } 521ab4382d2SGreg Kroah-Hartman 522f5291eccSPeter Hurley static int uart_put_char(struct tty_struct *tty, unsigned char c) 523ab4382d2SGreg Kroah-Hartman { 524f5291eccSPeter Hurley struct uart_state *state = tty->driver_data; 5259ed19428SPeter Hurley struct uart_port *port; 526f5291eccSPeter Hurley struct circ_buf *circ; 527ab4382d2SGreg Kroah-Hartman unsigned long flags; 528ab4382d2SGreg Kroah-Hartman int ret = 0; 529ab4382d2SGreg Kroah-Hartman 530f5291eccSPeter Hurley circ = &state->xmit; 5319ed19428SPeter Hurley port = uart_port_lock(state, flags); 532aff9cf59SSamir Virmani if (!circ->buf) { 533aff9cf59SSamir Virmani uart_port_unlock(port, flags); 534aff9cf59SSamir Virmani return 0; 535aff9cf59SSamir Virmani } 536aff9cf59SSamir Virmani 5379ed19428SPeter Hurley if (port && uart_circ_chars_free(circ) != 0) { 538ab4382d2SGreg Kroah-Hartman circ->buf[circ->head] = c; 539ab4382d2SGreg Kroah-Hartman circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1); 540ab4382d2SGreg Kroah-Hartman ret = 1; 541ab4382d2SGreg Kroah-Hartman } 5429ed19428SPeter Hurley uart_port_unlock(port, flags); 543ab4382d2SGreg Kroah-Hartman return ret; 544ab4382d2SGreg Kroah-Hartman } 545ab4382d2SGreg Kroah-Hartman 546ab4382d2SGreg Kroah-Hartman static void uart_flush_chars(struct tty_struct *tty) 547ab4382d2SGreg Kroah-Hartman { 548ab4382d2SGreg Kroah-Hartman uart_start(tty); 549ab4382d2SGreg Kroah-Hartman } 550ab4382d2SGreg Kroah-Hartman 551ab4382d2SGreg Kroah-Hartman static int uart_write(struct tty_struct *tty, 552ab4382d2SGreg Kroah-Hartman const unsigned char *buf, int count) 553ab4382d2SGreg Kroah-Hartman { 554ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 555ab4382d2SGreg Kroah-Hartman struct uart_port *port; 556ab4382d2SGreg Kroah-Hartman struct circ_buf *circ; 557ab4382d2SGreg Kroah-Hartman unsigned long flags; 558ab4382d2SGreg Kroah-Hartman int c, ret = 0; 559ab4382d2SGreg Kroah-Hartman 560ab4382d2SGreg Kroah-Hartman /* 561ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 562ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 563ab4382d2SGreg Kroah-Hartman */ 564ab4382d2SGreg Kroah-Hartman if (!state) { 565ab4382d2SGreg Kroah-Hartman WARN_ON(1); 566ab4382d2SGreg Kroah-Hartman return -EL3HLT; 567ab4382d2SGreg Kroah-Hartman } 568ab4382d2SGreg Kroah-Hartman 5699ed19428SPeter Hurley port = uart_port_lock(state, flags); 570aff9cf59SSamir Virmani circ = &state->xmit; 571aff9cf59SSamir Virmani if (!circ->buf) { 572aff9cf59SSamir Virmani uart_port_unlock(port, flags); 573aff9cf59SSamir Virmani return 0; 574aff9cf59SSamir Virmani } 575aff9cf59SSamir Virmani 5769ed19428SPeter Hurley while (port) { 577ab4382d2SGreg Kroah-Hartman c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE); 578ab4382d2SGreg Kroah-Hartman if (count < c) 579ab4382d2SGreg Kroah-Hartman c = count; 580ab4382d2SGreg Kroah-Hartman if (c <= 0) 581ab4382d2SGreg Kroah-Hartman break; 582ab4382d2SGreg Kroah-Hartman memcpy(circ->buf + circ->head, buf, c); 583ab4382d2SGreg Kroah-Hartman circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1); 584ab4382d2SGreg Kroah-Hartman buf += c; 585ab4382d2SGreg Kroah-Hartman count -= c; 586ab4382d2SGreg Kroah-Hartman ret += c; 587ab4382d2SGreg Kroah-Hartman } 58864dbee31SPeter Hurley 58964dbee31SPeter Hurley __uart_start(tty); 5909ed19428SPeter Hurley uart_port_unlock(port, flags); 591ab4382d2SGreg Kroah-Hartman return ret; 592ab4382d2SGreg Kroah-Hartman } 593ab4382d2SGreg Kroah-Hartman 59403b3b1a2SJiri Slaby static unsigned int uart_write_room(struct tty_struct *tty) 595ab4382d2SGreg Kroah-Hartman { 596ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 5979ed19428SPeter Hurley struct uart_port *port; 598ab4382d2SGreg Kroah-Hartman unsigned long flags; 59903b3b1a2SJiri Slaby unsigned int ret; 600ab4382d2SGreg Kroah-Hartman 6019ed19428SPeter Hurley port = uart_port_lock(state, flags); 602ab4382d2SGreg Kroah-Hartman ret = uart_circ_chars_free(&state->xmit); 6039ed19428SPeter Hurley uart_port_unlock(port, flags); 604ab4382d2SGreg Kroah-Hartman return ret; 605ab4382d2SGreg Kroah-Hartman } 606ab4382d2SGreg Kroah-Hartman 607fff4ef17SJiri Slaby static unsigned int uart_chars_in_buffer(struct tty_struct *tty) 608ab4382d2SGreg Kroah-Hartman { 609ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 6109ed19428SPeter Hurley struct uart_port *port; 611ab4382d2SGreg Kroah-Hartman unsigned long flags; 612fff4ef17SJiri Slaby unsigned int ret; 613ab4382d2SGreg Kroah-Hartman 6149ed19428SPeter Hurley port = uart_port_lock(state, flags); 615ab4382d2SGreg Kroah-Hartman ret = uart_circ_chars_pending(&state->xmit); 6169ed19428SPeter Hurley uart_port_unlock(port, flags); 617ab4382d2SGreg Kroah-Hartman return ret; 618ab4382d2SGreg Kroah-Hartman } 619ab4382d2SGreg Kroah-Hartman 620ab4382d2SGreg Kroah-Hartman static void uart_flush_buffer(struct tty_struct *tty) 621ab4382d2SGreg Kroah-Hartman { 622ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 623ab4382d2SGreg Kroah-Hartman struct uart_port *port; 624ab4382d2SGreg Kroah-Hartman unsigned long flags; 625ab4382d2SGreg Kroah-Hartman 626ab4382d2SGreg Kroah-Hartman /* 627ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 628ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 629ab4382d2SGreg Kroah-Hartman */ 630ab4382d2SGreg Kroah-Hartman if (!state) { 631ab4382d2SGreg Kroah-Hartman WARN_ON(1); 632ab4382d2SGreg Kroah-Hartman return; 633ab4382d2SGreg Kroah-Hartman } 634ab4382d2SGreg Kroah-Hartman 635ab4382d2SGreg Kroah-Hartman pr_debug("uart_flush_buffer(%d) called\n", tty->index); 636ab4382d2SGreg Kroah-Hartman 6379ed19428SPeter Hurley port = uart_port_lock(state, flags); 6389ed19428SPeter Hurley if (!port) 6399ed19428SPeter Hurley return; 640ab4382d2SGreg Kroah-Hartman uart_circ_clear(&state->xmit); 641ab4382d2SGreg Kroah-Hartman if (port->ops->flush_buffer) 642ab4382d2SGreg Kroah-Hartman port->ops->flush_buffer(port); 6439ed19428SPeter Hurley uart_port_unlock(port, flags); 644d0f4bce2SRob Herring tty_port_tty_wakeup(&state->port); 645ab4382d2SGreg Kroah-Hartman } 646ab4382d2SGreg Kroah-Hartman 647ab4382d2SGreg Kroah-Hartman /* 648f58c252eSIlpo Järvinen * This function performs low-level write of high-priority XON/XOFF 649f58c252eSIlpo Järvinen * character and accounting for it. 650f58c252eSIlpo Järvinen * 651f58c252eSIlpo Järvinen * Requires uart_port to implement .serial_out(). 652f58c252eSIlpo Järvinen */ 653f58c252eSIlpo Järvinen void uart_xchar_out(struct uart_port *uport, int offset) 654f58c252eSIlpo Järvinen { 655f58c252eSIlpo Järvinen serial_port_out(uport, offset, uport->x_char); 656f58c252eSIlpo Järvinen uport->icount.tx++; 657f58c252eSIlpo Järvinen uport->x_char = 0; 658f58c252eSIlpo Järvinen } 659f58c252eSIlpo Järvinen EXPORT_SYMBOL_GPL(uart_xchar_out); 660f58c252eSIlpo Järvinen 661f58c252eSIlpo Järvinen /* 662ab4382d2SGreg Kroah-Hartman * This function is used to send a high-priority XON/XOFF character to 663ab4382d2SGreg Kroah-Hartman * the device 664ab4382d2SGreg Kroah-Hartman */ 665ab4382d2SGreg Kroah-Hartman static void uart_send_xchar(struct tty_struct *tty, char ch) 666ab4382d2SGreg Kroah-Hartman { 667ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 6689ed19428SPeter Hurley struct uart_port *port; 669ab4382d2SGreg Kroah-Hartman unsigned long flags; 670ab4382d2SGreg Kroah-Hartman 6719ed19428SPeter Hurley port = uart_port_ref(state); 6729ed19428SPeter Hurley if (!port) 6739ed19428SPeter Hurley return; 6749ed19428SPeter Hurley 675ab4382d2SGreg Kroah-Hartman if (port->ops->send_xchar) 676ab4382d2SGreg Kroah-Hartman port->ops->send_xchar(port, ch); 677ab4382d2SGreg Kroah-Hartman else { 678ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 679c235ccc1SPeter Hurley port->x_char = ch; 680c235ccc1SPeter Hurley if (ch) 681ab4382d2SGreg Kroah-Hartman port->ops->start_tx(port); 682ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 683ab4382d2SGreg Kroah-Hartman } 6849ed19428SPeter Hurley uart_port_deref(port); 685ab4382d2SGreg Kroah-Hartman } 686ab4382d2SGreg Kroah-Hartman 687ab4382d2SGreg Kroah-Hartman static void uart_throttle(struct tty_struct *tty) 688ab4382d2SGreg Kroah-Hartman { 689ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 690c5f78b1fSJeremy Kerr upstat_t mask = UPSTAT_SYNC_FIFO; 6919ed19428SPeter Hurley struct uart_port *port; 692ab4382d2SGreg Kroah-Hartman 6939ed19428SPeter Hurley port = uart_port_ref(state); 6949ed19428SPeter Hurley if (!port) 6959ed19428SPeter Hurley return; 6969ed19428SPeter Hurley 697ab4382d2SGreg Kroah-Hartman if (I_IXOFF(tty)) 698391f93f2SPeter Hurley mask |= UPSTAT_AUTOXOFF; 6999db276f8SPeter Hurley if (C_CRTSCTS(tty)) 700391f93f2SPeter Hurley mask |= UPSTAT_AUTORTS; 7019aba8d5bSRussell King 702391f93f2SPeter Hurley if (port->status & mask) { 7039aba8d5bSRussell King port->ops->throttle(port); 704391f93f2SPeter Hurley mask &= ~port->status; 7059aba8d5bSRussell King } 7069aba8d5bSRussell King 707391f93f2SPeter Hurley if (mask & UPSTAT_AUTORTS) 7089aba8d5bSRussell King uart_clear_mctrl(port, TIOCM_RTS); 709b4749b97SPeter Hurley 710b4749b97SPeter Hurley if (mask & UPSTAT_AUTOXOFF) 711b4749b97SPeter Hurley uart_send_xchar(tty, STOP_CHAR(tty)); 7129ed19428SPeter Hurley 7139ed19428SPeter Hurley uart_port_deref(port); 714ab4382d2SGreg Kroah-Hartman } 715ab4382d2SGreg Kroah-Hartman 716ab4382d2SGreg Kroah-Hartman static void uart_unthrottle(struct tty_struct *tty) 717ab4382d2SGreg Kroah-Hartman { 718ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 719c5f78b1fSJeremy Kerr upstat_t mask = UPSTAT_SYNC_FIFO; 7209ed19428SPeter Hurley struct uart_port *port; 721ab4382d2SGreg Kroah-Hartman 7229ed19428SPeter Hurley port = uart_port_ref(state); 7239ed19428SPeter Hurley if (!port) 7249ed19428SPeter Hurley return; 7259ed19428SPeter Hurley 7269aba8d5bSRussell King if (I_IXOFF(tty)) 727391f93f2SPeter Hurley mask |= UPSTAT_AUTOXOFF; 7289db276f8SPeter Hurley if (C_CRTSCTS(tty)) 729391f93f2SPeter Hurley mask |= UPSTAT_AUTORTS; 7309aba8d5bSRussell King 731391f93f2SPeter Hurley if (port->status & mask) { 7329aba8d5bSRussell King port->ops->unthrottle(port); 733391f93f2SPeter Hurley mask &= ~port->status; 7349aba8d5bSRussell King } 7359aba8d5bSRussell King 736391f93f2SPeter Hurley if (mask & UPSTAT_AUTORTS) 737ab4382d2SGreg Kroah-Hartman uart_set_mctrl(port, TIOCM_RTS); 738b4749b97SPeter Hurley 739b4749b97SPeter Hurley if (mask & UPSTAT_AUTOXOFF) 740b4749b97SPeter Hurley uart_send_xchar(tty, START_CHAR(tty)); 7419ed19428SPeter Hurley 7429ed19428SPeter Hurley uart_port_deref(port); 743ab4382d2SGreg Kroah-Hartman } 744ab4382d2SGreg Kroah-Hartman 7454047b371SPeter Hurley static int uart_get_info(struct tty_port *port, struct serial_struct *retinfo) 746ab4382d2SGreg Kroah-Hartman { 7479f109694SAlan Cox struct uart_state *state = container_of(port, struct uart_state, port); 7484047b371SPeter Hurley struct uart_port *uport; 7494047b371SPeter Hurley int ret = -ENODEV; 7507ba2e769SAlan Cox 7513abe8c76SPeter Hurley /* 7523abe8c76SPeter Hurley * Ensure the state we copy is consistent and no hardware changes 7533abe8c76SPeter Hurley * occur as we go 7543abe8c76SPeter Hurley */ 7553abe8c76SPeter Hurley mutex_lock(&port->mutex); 7564047b371SPeter Hurley uport = uart_port_check(state); 7574047b371SPeter Hurley if (!uport) 7584047b371SPeter Hurley goto out; 7594047b371SPeter Hurley 7607ba2e769SAlan Cox retinfo->type = uport->type; 7617ba2e769SAlan Cox retinfo->line = uport->line; 7627ba2e769SAlan Cox retinfo->port = uport->iobase; 7637ba2e769SAlan Cox if (HIGH_BITS_OFFSET) 7647ba2e769SAlan Cox retinfo->port_high = (long) uport->iobase >> HIGH_BITS_OFFSET; 7657ba2e769SAlan Cox retinfo->irq = uport->irq; 766a17e74c5SAndy Shevchenko retinfo->flags = (__force int)uport->flags; 7677ba2e769SAlan Cox retinfo->xmit_fifo_size = uport->fifosize; 7687ba2e769SAlan Cox retinfo->baud_base = uport->uartclk / 16; 7697ba2e769SAlan Cox retinfo->close_delay = jiffies_to_msecs(port->close_delay) / 10; 7707ba2e769SAlan Cox retinfo->closing_wait = port->closing_wait == ASYNC_CLOSING_WAIT_NONE ? 7717ba2e769SAlan Cox ASYNC_CLOSING_WAIT_NONE : 7727ba2e769SAlan Cox jiffies_to_msecs(port->closing_wait) / 10; 7737ba2e769SAlan Cox retinfo->custom_divisor = uport->custom_divisor; 7747ba2e769SAlan Cox retinfo->hub6 = uport->hub6; 7757ba2e769SAlan Cox retinfo->io_type = uport->iotype; 7767ba2e769SAlan Cox retinfo->iomem_reg_shift = uport->regshift; 7777ba2e769SAlan Cox retinfo->iomem_base = (void *)(unsigned long)uport->mapbase; 7784047b371SPeter Hurley 7794047b371SPeter Hurley ret = 0; 7804047b371SPeter Hurley out: 781ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 7824047b371SPeter Hurley return ret; 7839f109694SAlan Cox } 7849f109694SAlan Cox 7855099d234SAl Viro static int uart_get_info_user(struct tty_struct *tty, 7865099d234SAl Viro struct serial_struct *ss) 7879f109694SAlan Cox { 7885099d234SAl Viro struct uart_state *state = tty->driver_data; 7895099d234SAl Viro struct tty_port *port = &state->port; 7903abe8c76SPeter Hurley 7915099d234SAl Viro return uart_get_info(port, ss) < 0 ? -EIO : 0; 792ab4382d2SGreg Kroah-Hartman } 793ab4382d2SGreg Kroah-Hartman 7947ba2e769SAlan Cox static int uart_set_info(struct tty_struct *tty, struct tty_port *port, 7957ba2e769SAlan Cox struct uart_state *state, 7967ba2e769SAlan Cox struct serial_struct *new_info) 797ab4382d2SGreg Kroah-Hartman { 7984047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 799ab4382d2SGreg Kroah-Hartman unsigned long new_port; 800ab4382d2SGreg Kroah-Hartman unsigned int change_irq, change_port, closing_wait; 801ab4382d2SGreg Kroah-Hartman unsigned int old_custom_divisor, close_delay; 802ab4382d2SGreg Kroah-Hartman upf_t old_flags, new_flags; 803ab4382d2SGreg Kroah-Hartman int retval = 0; 804ab4382d2SGreg Kroah-Hartman 8054047b371SPeter Hurley if (!uport) 8064047b371SPeter Hurley return -EIO; 8074047b371SPeter Hurley 8087ba2e769SAlan Cox new_port = new_info->port; 809ab4382d2SGreg Kroah-Hartman if (HIGH_BITS_OFFSET) 8107ba2e769SAlan Cox new_port += (unsigned long) new_info->port_high << HIGH_BITS_OFFSET; 811ab4382d2SGreg Kroah-Hartman 8127ba2e769SAlan Cox new_info->irq = irq_canonicalize(new_info->irq); 8137ba2e769SAlan Cox close_delay = msecs_to_jiffies(new_info->close_delay * 10); 8147ba2e769SAlan Cox closing_wait = new_info->closing_wait == ASYNC_CLOSING_WAIT_NONE ? 8154cb0fbfdSJiri Slaby ASYNC_CLOSING_WAIT_NONE : 8167ba2e769SAlan Cox msecs_to_jiffies(new_info->closing_wait * 10); 817ab4382d2SGreg Kroah-Hartman 818ab4382d2SGreg Kroah-Hartman 819ab4382d2SGreg Kroah-Hartman change_irq = !(uport->flags & UPF_FIXED_PORT) 8207ba2e769SAlan Cox && new_info->irq != uport->irq; 821ab4382d2SGreg Kroah-Hartman 822ab4382d2SGreg Kroah-Hartman /* 823ab4382d2SGreg Kroah-Hartman * Since changing the 'type' of the port changes its resource 824ab4382d2SGreg Kroah-Hartman * allocations, we should treat type changes the same as 825ab4382d2SGreg Kroah-Hartman * IO port changes. 826ab4382d2SGreg Kroah-Hartman */ 827ab4382d2SGreg Kroah-Hartman change_port = !(uport->flags & UPF_FIXED_PORT) 828ab4382d2SGreg Kroah-Hartman && (new_port != uport->iobase || 8297ba2e769SAlan Cox (unsigned long)new_info->iomem_base != uport->mapbase || 8307ba2e769SAlan Cox new_info->hub6 != uport->hub6 || 8317ba2e769SAlan Cox new_info->io_type != uport->iotype || 8327ba2e769SAlan Cox new_info->iomem_reg_shift != uport->regshift || 8337ba2e769SAlan Cox new_info->type != uport->type); 834ab4382d2SGreg Kroah-Hartman 835ab4382d2SGreg Kroah-Hartman old_flags = uport->flags; 836a17e74c5SAndy Shevchenko new_flags = (__force upf_t)new_info->flags; 837ab4382d2SGreg Kroah-Hartman old_custom_divisor = uport->custom_divisor; 838ab4382d2SGreg Kroah-Hartman 839ab4382d2SGreg Kroah-Hartman if (!capable(CAP_SYS_ADMIN)) { 840ab4382d2SGreg Kroah-Hartman retval = -EPERM; 841ab4382d2SGreg Kroah-Hartman if (change_irq || change_port || 8427ba2e769SAlan Cox (new_info->baud_base != uport->uartclk / 16) || 843ab4382d2SGreg Kroah-Hartman (close_delay != port->close_delay) || 844ab4382d2SGreg Kroah-Hartman (closing_wait != port->closing_wait) || 8457ba2e769SAlan Cox (new_info->xmit_fifo_size && 8467ba2e769SAlan Cox new_info->xmit_fifo_size != uport->fifosize) || 847ab4382d2SGreg Kroah-Hartman (((new_flags ^ old_flags) & ~UPF_USR_MASK) != 0)) 848ab4382d2SGreg Kroah-Hartman goto exit; 849ab4382d2SGreg Kroah-Hartman uport->flags = ((uport->flags & ~UPF_USR_MASK) | 850ab4382d2SGreg Kroah-Hartman (new_flags & UPF_USR_MASK)); 8517ba2e769SAlan Cox uport->custom_divisor = new_info->custom_divisor; 852ab4382d2SGreg Kroah-Hartman goto check_and_exit; 853ab4382d2SGreg Kroah-Hartman } 854ab4382d2SGreg Kroah-Hartman 8555e722b21SOndrej Mosnacek if (change_irq || change_port) { 856794edf30SDavid Howells retval = security_locked_down(LOCKDOWN_TIOCSSERIAL); 8575e722b21SOndrej Mosnacek if (retval) 858794edf30SDavid Howells goto exit; 8595e722b21SOndrej Mosnacek } 860794edf30SDavid Howells 861ab4382d2SGreg Kroah-Hartman /* 862ab4382d2SGreg Kroah-Hartman * Ask the low level driver to verify the settings. 863ab4382d2SGreg Kroah-Hartman */ 864ab4382d2SGreg Kroah-Hartman if (uport->ops->verify_port) 8657ba2e769SAlan Cox retval = uport->ops->verify_port(uport, new_info); 866ab4382d2SGreg Kroah-Hartman 8677ba2e769SAlan Cox if ((new_info->irq >= nr_irqs) || (new_info->irq < 0) || 8687ba2e769SAlan Cox (new_info->baud_base < 9600)) 869ab4382d2SGreg Kroah-Hartman retval = -EINVAL; 870ab4382d2SGreg Kroah-Hartman 871ab4382d2SGreg Kroah-Hartman if (retval) 872ab4382d2SGreg Kroah-Hartman goto exit; 873ab4382d2SGreg Kroah-Hartman 874ab4382d2SGreg Kroah-Hartman if (change_port || change_irq) { 875ab4382d2SGreg Kroah-Hartman retval = -EBUSY; 876ab4382d2SGreg Kroah-Hartman 877ab4382d2SGreg Kroah-Hartman /* 878ab4382d2SGreg Kroah-Hartman * Make sure that we are the sole user of this port. 879ab4382d2SGreg Kroah-Hartman */ 880ab4382d2SGreg Kroah-Hartman if (tty_port_users(port) > 1) 881ab4382d2SGreg Kroah-Hartman goto exit; 882ab4382d2SGreg Kroah-Hartman 883ab4382d2SGreg Kroah-Hartman /* 884ab4382d2SGreg Kroah-Hartman * We need to shutdown the serial port at the old 885ab4382d2SGreg Kroah-Hartman * port/type/irq combination. 886ab4382d2SGreg Kroah-Hartman */ 887ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 888ab4382d2SGreg Kroah-Hartman } 889ab4382d2SGreg Kroah-Hartman 890ab4382d2SGreg Kroah-Hartman if (change_port) { 891ab4382d2SGreg Kroah-Hartman unsigned long old_iobase, old_mapbase; 892ab4382d2SGreg Kroah-Hartman unsigned int old_type, old_iotype, old_hub6, old_shift; 893ab4382d2SGreg Kroah-Hartman 894ab4382d2SGreg Kroah-Hartman old_iobase = uport->iobase; 895ab4382d2SGreg Kroah-Hartman old_mapbase = uport->mapbase; 896ab4382d2SGreg Kroah-Hartman old_type = uport->type; 897ab4382d2SGreg Kroah-Hartman old_hub6 = uport->hub6; 898ab4382d2SGreg Kroah-Hartman old_iotype = uport->iotype; 899ab4382d2SGreg Kroah-Hartman old_shift = uport->regshift; 900ab4382d2SGreg Kroah-Hartman 901ab4382d2SGreg Kroah-Hartman /* 902ab4382d2SGreg Kroah-Hartman * Free and release old regions 903ab4382d2SGreg Kroah-Hartman */ 904a7cfaf16SFabio Estevam if (old_type != PORT_UNKNOWN && uport->ops->release_port) 905ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 906ab4382d2SGreg Kroah-Hartman 907ab4382d2SGreg Kroah-Hartman uport->iobase = new_port; 9087ba2e769SAlan Cox uport->type = new_info->type; 9097ba2e769SAlan Cox uport->hub6 = new_info->hub6; 9107ba2e769SAlan Cox uport->iotype = new_info->io_type; 9117ba2e769SAlan Cox uport->regshift = new_info->iomem_reg_shift; 9127ba2e769SAlan Cox uport->mapbase = (unsigned long)new_info->iomem_base; 913ab4382d2SGreg Kroah-Hartman 914ab4382d2SGreg Kroah-Hartman /* 915ab4382d2SGreg Kroah-Hartman * Claim and map the new regions 916ab4382d2SGreg Kroah-Hartman */ 917a7cfaf16SFabio Estevam if (uport->type != PORT_UNKNOWN && uport->ops->request_port) { 918ab4382d2SGreg Kroah-Hartman retval = uport->ops->request_port(uport); 919ab4382d2SGreg Kroah-Hartman } else { 920ab4382d2SGreg Kroah-Hartman /* Always success - Jean II */ 921ab4382d2SGreg Kroah-Hartman retval = 0; 922ab4382d2SGreg Kroah-Hartman } 923ab4382d2SGreg Kroah-Hartman 924ab4382d2SGreg Kroah-Hartman /* 925ab4382d2SGreg Kroah-Hartman * If we fail to request resources for the 926ab4382d2SGreg Kroah-Hartman * new port, try to restore the old settings. 927ab4382d2SGreg Kroah-Hartman */ 9287deb39edSThomas Pfaff if (retval) { 929ab4382d2SGreg Kroah-Hartman uport->iobase = old_iobase; 930ab4382d2SGreg Kroah-Hartman uport->type = old_type; 931ab4382d2SGreg Kroah-Hartman uport->hub6 = old_hub6; 932ab4382d2SGreg Kroah-Hartman uport->iotype = old_iotype; 933ab4382d2SGreg Kroah-Hartman uport->regshift = old_shift; 934ab4382d2SGreg Kroah-Hartman uport->mapbase = old_mapbase; 9357deb39edSThomas Pfaff 9367deb39edSThomas Pfaff if (old_type != PORT_UNKNOWN) { 937ab4382d2SGreg Kroah-Hartman retval = uport->ops->request_port(uport); 938ab4382d2SGreg Kroah-Hartman /* 939ab4382d2SGreg Kroah-Hartman * If we failed to restore the old settings, 940ab4382d2SGreg Kroah-Hartman * we fail like this. 941ab4382d2SGreg Kroah-Hartman */ 942ab4382d2SGreg Kroah-Hartman if (retval) 943ab4382d2SGreg Kroah-Hartman uport->type = PORT_UNKNOWN; 944ab4382d2SGreg Kroah-Hartman 945ab4382d2SGreg Kroah-Hartman /* 946ab4382d2SGreg Kroah-Hartman * We failed anyway. 947ab4382d2SGreg Kroah-Hartman */ 948ab4382d2SGreg Kroah-Hartman retval = -EBUSY; 9497deb39edSThomas Pfaff } 9507deb39edSThomas Pfaff 951ab4382d2SGreg Kroah-Hartman /* Added to return the correct error -Ram Gupta */ 952ab4382d2SGreg Kroah-Hartman goto exit; 953ab4382d2SGreg Kroah-Hartman } 954ab4382d2SGreg Kroah-Hartman } 955ab4382d2SGreg Kroah-Hartman 956ab4382d2SGreg Kroah-Hartman if (change_irq) 9577ba2e769SAlan Cox uport->irq = new_info->irq; 958ab4382d2SGreg Kroah-Hartman if (!(uport->flags & UPF_FIXED_PORT)) 9597ba2e769SAlan Cox uport->uartclk = new_info->baud_base * 16; 960ab4382d2SGreg Kroah-Hartman uport->flags = (uport->flags & ~UPF_CHANGE_MASK) | 961ab4382d2SGreg Kroah-Hartman (new_flags & UPF_CHANGE_MASK); 9627ba2e769SAlan Cox uport->custom_divisor = new_info->custom_divisor; 963ab4382d2SGreg Kroah-Hartman port->close_delay = close_delay; 964ab4382d2SGreg Kroah-Hartman port->closing_wait = closing_wait; 9657ba2e769SAlan Cox if (new_info->xmit_fifo_size) 9667ba2e769SAlan Cox uport->fifosize = new_info->xmit_fifo_size; 967ab4382d2SGreg Kroah-Hartman 968ab4382d2SGreg Kroah-Hartman check_and_exit: 969ab4382d2SGreg Kroah-Hartman retval = 0; 970ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) 971ab4382d2SGreg Kroah-Hartman goto exit; 972d41861caSPeter Hurley if (tty_port_initialized(port)) { 973ab4382d2SGreg Kroah-Hartman if (((old_flags ^ uport->flags) & UPF_SPD_MASK) || 974ab4382d2SGreg Kroah-Hartman old_custom_divisor != uport->custom_divisor) { 975ab4382d2SGreg Kroah-Hartman /* 976ab4382d2SGreg Kroah-Hartman * If they're setting up a custom divisor or speed, 977dc2f7271SJohan Hovold * instead of clearing it, then bitch about it. 978ab4382d2SGreg Kroah-Hartman */ 979ab4382d2SGreg Kroah-Hartman if (uport->flags & UPF_SPD_MASK) { 980dc2f7271SJohan Hovold dev_notice_ratelimited(uport->dev, 9812f2dafe7SSudip Mukherjee "%s sets custom speed on %s. This is deprecated.\n", 9822f2dafe7SSudip Mukherjee current->comm, 983429b4749SRasmus Villemoes tty_name(port->tty)); 984ab4382d2SGreg Kroah-Hartman } 985ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 986ab4382d2SGreg Kroah-Hartman } 987b3b57646SRob Herring } else { 988ab4382d2SGreg Kroah-Hartman retval = uart_startup(tty, state, 1); 98944117a1dSSebastian Andrzej Siewior if (retval == 0) 99044117a1dSSebastian Andrzej Siewior tty_port_set_initialized(port, true); 991b3b57646SRob Herring if (retval > 0) 992b3b57646SRob Herring retval = 0; 993b3b57646SRob Herring } 994ab4382d2SGreg Kroah-Hartman exit: 9957ba2e769SAlan Cox return retval; 9967ba2e769SAlan Cox } 9977ba2e769SAlan Cox 9985099d234SAl Viro static int uart_set_info_user(struct tty_struct *tty, struct serial_struct *ss) 9997ba2e769SAlan Cox { 10005099d234SAl Viro struct uart_state *state = tty->driver_data; 10017ba2e769SAlan Cox struct tty_port *port = &state->port; 10027ba2e769SAlan Cox int retval; 10037ba2e769SAlan Cox 10045099d234SAl Viro down_write(&tty->termios_rwsem); 10057ba2e769SAlan Cox /* 10067ba2e769SAlan Cox * This semaphore protects port->count. It is also 10077ba2e769SAlan Cox * very useful to prevent opens. Also, take the 10087ba2e769SAlan Cox * port configuration semaphore to make sure that a 10097ba2e769SAlan Cox * module insertion/removal doesn't change anything 10107ba2e769SAlan Cox * under us. 10117ba2e769SAlan Cox */ 10127ba2e769SAlan Cox mutex_lock(&port->mutex); 10135099d234SAl Viro retval = uart_set_info(tty, port, state, ss); 1014ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 10155099d234SAl Viro up_write(&tty->termios_rwsem); 1016ab4382d2SGreg Kroah-Hartman return retval; 1017ab4382d2SGreg Kroah-Hartman } 1018ab4382d2SGreg Kroah-Hartman 1019ab4382d2SGreg Kroah-Hartman /** 1020ab4382d2SGreg Kroah-Hartman * uart_get_lsr_info - get line status register info 1021ab4382d2SGreg Kroah-Hartman * @tty: tty associated with the UART 1022ab4382d2SGreg Kroah-Hartman * @state: UART being queried 1023ab4382d2SGreg Kroah-Hartman * @value: returned modem value 1024ab4382d2SGreg Kroah-Hartman */ 1025ab4382d2SGreg Kroah-Hartman static int uart_get_lsr_info(struct tty_struct *tty, 1026ab4382d2SGreg Kroah-Hartman struct uart_state *state, unsigned int __user *value) 1027ab4382d2SGreg Kroah-Hartman { 10284047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 1029ab4382d2SGreg Kroah-Hartman unsigned int result; 1030ab4382d2SGreg Kroah-Hartman 1031ab4382d2SGreg Kroah-Hartman result = uport->ops->tx_empty(uport); 1032ab4382d2SGreg Kroah-Hartman 1033ab4382d2SGreg Kroah-Hartman /* 1034ab4382d2SGreg Kroah-Hartman * If we're about to load something into the transmit 1035ab4382d2SGreg Kroah-Hartman * register, we'll pretend the transmitter isn't empty to 1036ab4382d2SGreg Kroah-Hartman * avoid a race condition (depending on when the transmit 1037ab4382d2SGreg Kroah-Hartman * interrupt happens). 1038ab4382d2SGreg Kroah-Hartman */ 1039ab4382d2SGreg Kroah-Hartman if (uport->x_char || 1040ab4382d2SGreg Kroah-Hartman ((uart_circ_chars_pending(&state->xmit) > 0) && 1041d01f4d18SPeter Hurley !uart_tx_stopped(uport))) 1042ab4382d2SGreg Kroah-Hartman result &= ~TIOCSER_TEMT; 1043ab4382d2SGreg Kroah-Hartman 1044ab4382d2SGreg Kroah-Hartman return put_user(result, value); 1045ab4382d2SGreg Kroah-Hartman } 1046ab4382d2SGreg Kroah-Hartman 104760b33c13SAlan Cox static int uart_tiocmget(struct tty_struct *tty) 1048ab4382d2SGreg Kroah-Hartman { 1049ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1050ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 10514047b371SPeter Hurley struct uart_port *uport; 1052ab4382d2SGreg Kroah-Hartman int result = -EIO; 1053ab4382d2SGreg Kroah-Hartman 1054ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 10554047b371SPeter Hurley uport = uart_port_check(state); 10564047b371SPeter Hurley if (!uport) 10574047b371SPeter Hurley goto out; 10584047b371SPeter Hurley 105918900ca6SPeter Hurley if (!tty_io_error(tty)) { 1060ab4382d2SGreg Kroah-Hartman result = uport->mctrl; 1061ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1062ab4382d2SGreg Kroah-Hartman result |= uport->ops->get_mctrl(uport); 1063ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1064ab4382d2SGreg Kroah-Hartman } 10654047b371SPeter Hurley out: 1066ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1067ab4382d2SGreg Kroah-Hartman return result; 1068ab4382d2SGreg Kroah-Hartman } 1069ab4382d2SGreg Kroah-Hartman 1070ab4382d2SGreg Kroah-Hartman static int 107120b9d177SAlan Cox uart_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear) 1072ab4382d2SGreg Kroah-Hartman { 1073ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1074ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 10754047b371SPeter Hurley struct uart_port *uport; 1076ab4382d2SGreg Kroah-Hartman int ret = -EIO; 1077ab4382d2SGreg Kroah-Hartman 1078ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 10794047b371SPeter Hurley uport = uart_port_check(state); 10804047b371SPeter Hurley if (!uport) 10814047b371SPeter Hurley goto out; 10824047b371SPeter Hurley 108318900ca6SPeter Hurley if (!tty_io_error(tty)) { 1084ab4382d2SGreg Kroah-Hartman uart_update_mctrl(uport, set, clear); 1085ab4382d2SGreg Kroah-Hartman ret = 0; 1086ab4382d2SGreg Kroah-Hartman } 10874047b371SPeter Hurley out: 1088ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1089ab4382d2SGreg Kroah-Hartman return ret; 1090ab4382d2SGreg Kroah-Hartman } 1091ab4382d2SGreg Kroah-Hartman 1092ab4382d2SGreg Kroah-Hartman static int uart_break_ctl(struct tty_struct *tty, int break_state) 1093ab4382d2SGreg Kroah-Hartman { 1094ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1095ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 10964047b371SPeter Hurley struct uart_port *uport; 10974047b371SPeter Hurley int ret = -EIO; 1098ab4382d2SGreg Kroah-Hartman 1099ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 11004047b371SPeter Hurley uport = uart_port_check(state); 11014047b371SPeter Hurley if (!uport) 11024047b371SPeter Hurley goto out; 1103ab4382d2SGreg Kroah-Hartman 11047d73170eSJiangfeng Xiao if (uport->type != PORT_UNKNOWN && uport->ops->break_ctl) 1105ab4382d2SGreg Kroah-Hartman uport->ops->break_ctl(uport, break_state); 11064047b371SPeter Hurley ret = 0; 11074047b371SPeter Hurley out: 1108ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 11094047b371SPeter Hurley return ret; 1110ab4382d2SGreg Kroah-Hartman } 1111ab4382d2SGreg Kroah-Hartman 1112ab4382d2SGreg Kroah-Hartman static int uart_do_autoconfig(struct tty_struct *tty, struct uart_state *state) 1113ab4382d2SGreg Kroah-Hartman { 1114ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 11154047b371SPeter Hurley struct uart_port *uport; 1116ab4382d2SGreg Kroah-Hartman int flags, ret; 1117ab4382d2SGreg Kroah-Hartman 1118ab4382d2SGreg Kroah-Hartman if (!capable(CAP_SYS_ADMIN)) 1119ab4382d2SGreg Kroah-Hartman return -EPERM; 1120ab4382d2SGreg Kroah-Hartman 1121ab4382d2SGreg Kroah-Hartman /* 1122ab4382d2SGreg Kroah-Hartman * Take the per-port semaphore. This prevents count from 1123ab4382d2SGreg Kroah-Hartman * changing, and hence any extra opens of the port while 1124ab4382d2SGreg Kroah-Hartman * we're auto-configuring. 1125ab4382d2SGreg Kroah-Hartman */ 1126ab4382d2SGreg Kroah-Hartman if (mutex_lock_interruptible(&port->mutex)) 1127ab4382d2SGreg Kroah-Hartman return -ERESTARTSYS; 1128ab4382d2SGreg Kroah-Hartman 11294047b371SPeter Hurley uport = uart_port_check(state); 11304047b371SPeter Hurley if (!uport) { 11314047b371SPeter Hurley ret = -EIO; 11324047b371SPeter Hurley goto out; 11334047b371SPeter Hurley } 11344047b371SPeter Hurley 1135ab4382d2SGreg Kroah-Hartman ret = -EBUSY; 1136ab4382d2SGreg Kroah-Hartman if (tty_port_users(port) == 1) { 1137ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 1138ab4382d2SGreg Kroah-Hartman 1139ab4382d2SGreg Kroah-Hartman /* 1140ab4382d2SGreg Kroah-Hartman * If we already have a port type configured, 1141ab4382d2SGreg Kroah-Hartman * we must release its resources. 1142ab4382d2SGreg Kroah-Hartman */ 1143a7cfaf16SFabio Estevam if (uport->type != PORT_UNKNOWN && uport->ops->release_port) 1144ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 1145ab4382d2SGreg Kroah-Hartman 1146ab4382d2SGreg Kroah-Hartman flags = UART_CONFIG_TYPE; 1147ab4382d2SGreg Kroah-Hartman if (uport->flags & UPF_AUTO_IRQ) 1148ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_IRQ; 1149ab4382d2SGreg Kroah-Hartman 1150ab4382d2SGreg Kroah-Hartman /* 1151ab4382d2SGreg Kroah-Hartman * This will claim the ports resources if 1152ab4382d2SGreg Kroah-Hartman * a port is found. 1153ab4382d2SGreg Kroah-Hartman */ 1154ab4382d2SGreg Kroah-Hartman uport->ops->config_port(uport, flags); 1155ab4382d2SGreg Kroah-Hartman 1156ab4382d2SGreg Kroah-Hartman ret = uart_startup(tty, state, 1); 115771456906SSebastian Andrzej Siewior if (ret == 0) 115871456906SSebastian Andrzej Siewior tty_port_set_initialized(port, true); 1159b3b57646SRob Herring if (ret > 0) 1160b3b57646SRob Herring ret = 0; 1161ab4382d2SGreg Kroah-Hartman } 11624047b371SPeter Hurley out: 1163ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1164ab4382d2SGreg Kroah-Hartman return ret; 1165ab4382d2SGreg Kroah-Hartman } 1166ab4382d2SGreg Kroah-Hartman 11671fdc3106SAlexander Shiyan static void uart_enable_ms(struct uart_port *uport) 11681fdc3106SAlexander Shiyan { 11691fdc3106SAlexander Shiyan /* 11701fdc3106SAlexander Shiyan * Force modem status interrupts on 11711fdc3106SAlexander Shiyan */ 11721fdc3106SAlexander Shiyan if (uport->ops->enable_ms) 11731fdc3106SAlexander Shiyan uport->ops->enable_ms(uport); 11741fdc3106SAlexander Shiyan } 11751fdc3106SAlexander Shiyan 1176ab4382d2SGreg Kroah-Hartman /* 1177ab4382d2SGreg Kroah-Hartman * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change 1178ab4382d2SGreg Kroah-Hartman * - mask passed in arg for lines of interest 1179ab4382d2SGreg Kroah-Hartman * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) 1180ab4382d2SGreg Kroah-Hartman * Caller should use TIOCGICOUNT to see which one it was 1181ab4382d2SGreg Kroah-Hartman * 1182ab4382d2SGreg Kroah-Hartman * FIXME: This wants extracting into a common all driver implementation 1183ab4382d2SGreg Kroah-Hartman * of TIOCMWAIT using tty_port. 1184ab4382d2SGreg Kroah-Hartman */ 11859ed19428SPeter Hurley static int uart_wait_modem_status(struct uart_state *state, unsigned long arg) 1186ab4382d2SGreg Kroah-Hartman { 11879ed19428SPeter Hurley struct uart_port *uport; 1188ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1189ab4382d2SGreg Kroah-Hartman DECLARE_WAITQUEUE(wait, current); 1190ab4382d2SGreg Kroah-Hartman struct uart_icount cprev, cnow; 1191ab4382d2SGreg Kroah-Hartman int ret; 1192ab4382d2SGreg Kroah-Hartman 1193ab4382d2SGreg Kroah-Hartman /* 1194ab4382d2SGreg Kroah-Hartman * note the counters on entry 1195ab4382d2SGreg Kroah-Hartman */ 11969ed19428SPeter Hurley uport = uart_port_ref(state); 11979ed19428SPeter Hurley if (!uport) 11989ed19428SPeter Hurley return -EIO; 1199ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1200ab4382d2SGreg Kroah-Hartman memcpy(&cprev, &uport->icount, sizeof(struct uart_icount)); 12011fdc3106SAlexander Shiyan uart_enable_ms(uport); 1202ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1203ab4382d2SGreg Kroah-Hartman 1204ab4382d2SGreg Kroah-Hartman add_wait_queue(&port->delta_msr_wait, &wait); 1205ab4382d2SGreg Kroah-Hartman for (;;) { 1206ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1207ab4382d2SGreg Kroah-Hartman memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); 1208ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1209ab4382d2SGreg Kroah-Hartman 1210ab4382d2SGreg Kroah-Hartman set_current_state(TASK_INTERRUPTIBLE); 1211ab4382d2SGreg Kroah-Hartman 1212ab4382d2SGreg Kroah-Hartman if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || 1213ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || 1214ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || 1215ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) { 1216ab4382d2SGreg Kroah-Hartman ret = 0; 1217ab4382d2SGreg Kroah-Hartman break; 1218ab4382d2SGreg Kroah-Hartman } 1219ab4382d2SGreg Kroah-Hartman 1220ab4382d2SGreg Kroah-Hartman schedule(); 1221ab4382d2SGreg Kroah-Hartman 1222ab4382d2SGreg Kroah-Hartman /* see if a signal did it */ 1223ab4382d2SGreg Kroah-Hartman if (signal_pending(current)) { 1224ab4382d2SGreg Kroah-Hartman ret = -ERESTARTSYS; 1225ab4382d2SGreg Kroah-Hartman break; 1226ab4382d2SGreg Kroah-Hartman } 1227ab4382d2SGreg Kroah-Hartman 1228ab4382d2SGreg Kroah-Hartman cprev = cnow; 1229ab4382d2SGreg Kroah-Hartman } 123097f9f707SFabian Frederick __set_current_state(TASK_RUNNING); 1231ab4382d2SGreg Kroah-Hartman remove_wait_queue(&port->delta_msr_wait, &wait); 12329ed19428SPeter Hurley uart_port_deref(uport); 1233ab4382d2SGreg Kroah-Hartman 1234ab4382d2SGreg Kroah-Hartman return ret; 1235ab4382d2SGreg Kroah-Hartman } 1236ab4382d2SGreg Kroah-Hartman 1237ab4382d2SGreg Kroah-Hartman /* 1238ab4382d2SGreg Kroah-Hartman * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) 1239ab4382d2SGreg Kroah-Hartman * Return: write counters to the user passed counter struct 1240ab4382d2SGreg Kroah-Hartman * NB: both 1->0 and 0->1 transitions are counted except for 1241ab4382d2SGreg Kroah-Hartman * RI where only 0->1 is counted. 1242ab4382d2SGreg Kroah-Hartman */ 1243ab4382d2SGreg Kroah-Hartman static int uart_get_icount(struct tty_struct *tty, 1244ab4382d2SGreg Kroah-Hartman struct serial_icounter_struct *icount) 1245ab4382d2SGreg Kroah-Hartman { 1246ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1247ab4382d2SGreg Kroah-Hartman struct uart_icount cnow; 12489ed19428SPeter Hurley struct uart_port *uport; 1249ab4382d2SGreg Kroah-Hartman 12509ed19428SPeter Hurley uport = uart_port_ref(state); 12519ed19428SPeter Hurley if (!uport) 12529ed19428SPeter Hurley return -EIO; 1253ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1254ab4382d2SGreg Kroah-Hartman memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); 1255ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 12569ed19428SPeter Hurley uart_port_deref(uport); 1257ab4382d2SGreg Kroah-Hartman 1258ab4382d2SGreg Kroah-Hartman icount->cts = cnow.cts; 1259ab4382d2SGreg Kroah-Hartman icount->dsr = cnow.dsr; 1260ab4382d2SGreg Kroah-Hartman icount->rng = cnow.rng; 1261ab4382d2SGreg Kroah-Hartman icount->dcd = cnow.dcd; 1262ab4382d2SGreg Kroah-Hartman icount->rx = cnow.rx; 1263ab4382d2SGreg Kroah-Hartman icount->tx = cnow.tx; 1264ab4382d2SGreg Kroah-Hartman icount->frame = cnow.frame; 1265ab4382d2SGreg Kroah-Hartman icount->overrun = cnow.overrun; 1266ab4382d2SGreg Kroah-Hartman icount->parity = cnow.parity; 1267ab4382d2SGreg Kroah-Hartman icount->brk = cnow.brk; 1268ab4382d2SGreg Kroah-Hartman icount->buf_overrun = cnow.buf_overrun; 1269ab4382d2SGreg Kroah-Hartman 1270ab4382d2SGreg Kroah-Hartman return 0; 1271ab4382d2SGreg Kroah-Hartman } 1272ab4382d2SGreg Kroah-Hartman 127351ad36baSIlpo Järvinen #define SER_RS485_LEGACY_FLAGS (SER_RS485_ENABLED | SER_RS485_RTS_ON_SEND | \ 127451ad36baSIlpo Järvinen SER_RS485_RTS_AFTER_SEND | SER_RS485_RX_DURING_TX | \ 127551ad36baSIlpo Järvinen SER_RS485_TERMINATE_BUS) 127651ad36baSIlpo Järvinen 127751ad36baSIlpo Järvinen static int uart_check_rs485_flags(struct uart_port *port, struct serial_rs485 *rs485) 127851ad36baSIlpo Järvinen { 127951ad36baSIlpo Järvinen u32 flags = rs485->flags; 128051ad36baSIlpo Järvinen 128151ad36baSIlpo Järvinen /* Don't return -EINVAL for unsupported legacy flags */ 128251ad36baSIlpo Järvinen flags &= ~SER_RS485_LEGACY_FLAGS; 128351ad36baSIlpo Järvinen 128451ad36baSIlpo Järvinen /* 128551ad36baSIlpo Järvinen * For any bit outside of the legacy ones that is not supported by 128651ad36baSIlpo Järvinen * the driver, return -EINVAL. 128751ad36baSIlpo Järvinen */ 128851ad36baSIlpo Järvinen if (flags & ~port->rs485_supported->flags) 128951ad36baSIlpo Järvinen return -EINVAL; 129051ad36baSIlpo Järvinen 129151ad36baSIlpo Järvinen return 0; 129251ad36baSIlpo Järvinen } 129351ad36baSIlpo Järvinen 12942dbd0c14SIlpo Järvinen static void uart_sanitize_serial_rs485(struct uart_port *port, struct serial_rs485 *rs485) 12952dbd0c14SIlpo Järvinen { 1296be2e2cb1SIlpo Järvinen u32 supported_flags = port->rs485_supported->flags; 1297be2e2cb1SIlpo Järvinen 1298596a9171SIlpo Järvinen if (!(rs485->flags & SER_RS485_ENABLED)) { 1299596a9171SIlpo Järvinen memset(rs485, 0, sizeof(*rs485)); 1300596a9171SIlpo Järvinen return; 1301596a9171SIlpo Järvinen } 1302596a9171SIlpo Järvinen 13032dbd0c14SIlpo Järvinen /* pick sane settings if the user hasn't */ 1304be2e2cb1SIlpo Järvinen if ((supported_flags & (SER_RS485_RTS_ON_SEND|SER_RS485_RTS_AFTER_SEND)) && 1305be2e2cb1SIlpo Järvinen !(rs485->flags & SER_RS485_RTS_ON_SEND) == 13062dbd0c14SIlpo Järvinen !(rs485->flags & SER_RS485_RTS_AFTER_SEND)) { 13072dbd0c14SIlpo Järvinen dev_warn_ratelimited(port->dev, 13082dbd0c14SIlpo Järvinen "%s (%d): invalid RTS setting, using RTS_ON_SEND instead\n", 13092dbd0c14SIlpo Järvinen port->name, port->line); 13102dbd0c14SIlpo Järvinen rs485->flags |= SER_RS485_RTS_ON_SEND; 13112dbd0c14SIlpo Järvinen rs485->flags &= ~SER_RS485_RTS_AFTER_SEND; 1312be2e2cb1SIlpo Järvinen supported_flags |= SER_RS485_RTS_ON_SEND|SER_RS485_RTS_AFTER_SEND; 13132dbd0c14SIlpo Järvinen } 13142dbd0c14SIlpo Järvinen 1315be2e2cb1SIlpo Järvinen if (!port->rs485_supported->delay_rts_before_send) { 1316be2e2cb1SIlpo Järvinen if (rs485->delay_rts_before_send) { 1317be2e2cb1SIlpo Järvinen dev_warn_ratelimited(port->dev, 1318be2e2cb1SIlpo Järvinen "%s (%d): RTS delay before sending not supported\n", 1319be2e2cb1SIlpo Järvinen port->name, port->line); 1320be2e2cb1SIlpo Järvinen } 1321be2e2cb1SIlpo Järvinen rs485->delay_rts_before_send = 0; 1322be2e2cb1SIlpo Järvinen } else if (rs485->delay_rts_before_send > RS485_MAX_RTS_DELAY) { 13232dbd0c14SIlpo Järvinen rs485->delay_rts_before_send = RS485_MAX_RTS_DELAY; 13242dbd0c14SIlpo Järvinen dev_warn_ratelimited(port->dev, 13252dbd0c14SIlpo Järvinen "%s (%d): RTS delay before sending clamped to %u ms\n", 13262dbd0c14SIlpo Järvinen port->name, port->line, rs485->delay_rts_before_send); 13272dbd0c14SIlpo Järvinen } 13282dbd0c14SIlpo Järvinen 1329be2e2cb1SIlpo Järvinen if (!port->rs485_supported->delay_rts_after_send) { 1330be2e2cb1SIlpo Järvinen if (rs485->delay_rts_after_send) { 1331be2e2cb1SIlpo Järvinen dev_warn_ratelimited(port->dev, 1332be2e2cb1SIlpo Järvinen "%s (%d): RTS delay after sending not supported\n", 1333be2e2cb1SIlpo Järvinen port->name, port->line); 1334be2e2cb1SIlpo Järvinen } 1335be2e2cb1SIlpo Järvinen rs485->delay_rts_after_send = 0; 1336be2e2cb1SIlpo Järvinen } else if (rs485->delay_rts_after_send > RS485_MAX_RTS_DELAY) { 13372dbd0c14SIlpo Järvinen rs485->delay_rts_after_send = RS485_MAX_RTS_DELAY; 13382dbd0c14SIlpo Järvinen dev_warn_ratelimited(port->dev, 13392dbd0c14SIlpo Järvinen "%s (%d): RTS delay after sending clamped to %u ms\n", 13402dbd0c14SIlpo Järvinen port->name, port->line, rs485->delay_rts_after_send); 13412dbd0c14SIlpo Järvinen } 1342be2e2cb1SIlpo Järvinen 1343be2e2cb1SIlpo Järvinen rs485->flags &= supported_flags; 1344be2e2cb1SIlpo Järvinen 13452dbd0c14SIlpo Järvinen /* Return clean padding area to userspace */ 13462dbd0c14SIlpo Järvinen memset(rs485->padding, 0, sizeof(rs485->padding)); 13472dbd0c14SIlpo Järvinen } 13482dbd0c14SIlpo Järvinen 13498322b1f5SIlpo Järvinen int uart_rs485_config(struct uart_port *port) 13508322b1f5SIlpo Järvinen { 1351be2e2cb1SIlpo Järvinen struct serial_rs485 *rs485 = &port->rs485; 1352596a9171SIlpo Järvinen int ret; 1353be2e2cb1SIlpo Järvinen 1354be2e2cb1SIlpo Järvinen uart_sanitize_serial_rs485(port, rs485); 1355be2e2cb1SIlpo Järvinen 1356596a9171SIlpo Järvinen ret = port->rs485_config(port, rs485); 1357596a9171SIlpo Järvinen if (ret) 1358596a9171SIlpo Järvinen memset(rs485, 0, sizeof(*rs485)); 1359596a9171SIlpo Järvinen 1360596a9171SIlpo Järvinen return ret; 13618322b1f5SIlpo Järvinen } 13628322b1f5SIlpo Järvinen EXPORT_SYMBOL_GPL(uart_rs485_config); 13638322b1f5SIlpo Järvinen 1364a5f276f1SRicardo Ribalda Delgado static int uart_get_rs485_config(struct uart_port *port, 1365a5f276f1SRicardo Ribalda Delgado struct serial_rs485 __user *rs485) 1366a5f276f1SRicardo Ribalda Delgado { 1367bd737f87SRicardo Ribalda Delgado unsigned long flags; 1368bd737f87SRicardo Ribalda Delgado struct serial_rs485 aux; 1369bd737f87SRicardo Ribalda Delgado 1370bd737f87SRicardo Ribalda Delgado spin_lock_irqsave(&port->lock, flags); 1371bd737f87SRicardo Ribalda Delgado aux = port->rs485; 1372bd737f87SRicardo Ribalda Delgado spin_unlock_irqrestore(&port->lock, flags); 1373bd737f87SRicardo Ribalda Delgado 1374bd737f87SRicardo Ribalda Delgado if (copy_to_user(rs485, &aux, sizeof(aux))) 1375a5f276f1SRicardo Ribalda Delgado return -EFAULT; 1376bd737f87SRicardo Ribalda Delgado 1377a5f276f1SRicardo Ribalda Delgado return 0; 1378a5f276f1SRicardo Ribalda Delgado } 1379a5f276f1SRicardo Ribalda Delgado 1380a5f276f1SRicardo Ribalda Delgado static int uart_set_rs485_config(struct uart_port *port, 1381a5f276f1SRicardo Ribalda Delgado struct serial_rs485 __user *rs485_user) 1382a5f276f1SRicardo Ribalda Delgado { 1383a5f276f1SRicardo Ribalda Delgado struct serial_rs485 rs485; 1384a5f276f1SRicardo Ribalda Delgado int ret; 1385bd737f87SRicardo Ribalda Delgado unsigned long flags; 1386a5f276f1SRicardo Ribalda Delgado 1387a5f276f1SRicardo Ribalda Delgado if (!port->rs485_config) 138879c5966cSJohan Hovold return -ENOTTY; 1389a5f276f1SRicardo Ribalda Delgado 1390a5f276f1SRicardo Ribalda Delgado if (copy_from_user(&rs485, rs485_user, sizeof(*rs485_user))) 1391a5f276f1SRicardo Ribalda Delgado return -EFAULT; 1392a5f276f1SRicardo Ribalda Delgado 139351ad36baSIlpo Järvinen ret = uart_check_rs485_flags(port, &rs485); 139451ad36baSIlpo Järvinen if (ret) 139551ad36baSIlpo Järvinen return ret; 13962dbd0c14SIlpo Järvinen uart_sanitize_serial_rs485(port, &rs485); 13970ed12afaSLino Sanfilippo 1398bd737f87SRicardo Ribalda Delgado spin_lock_irqsave(&port->lock, flags); 1399a5f276f1SRicardo Ribalda Delgado ret = port->rs485_config(port, &rs485); 14000ed12afaSLino Sanfilippo if (!ret) 14010ed12afaSLino Sanfilippo port->rs485 = rs485; 1402bd737f87SRicardo Ribalda Delgado spin_unlock_irqrestore(&port->lock, flags); 1403a5f276f1SRicardo Ribalda Delgado if (ret) 1404a5f276f1SRicardo Ribalda Delgado return ret; 1405a5f276f1SRicardo Ribalda Delgado 1406a5f276f1SRicardo Ribalda Delgado if (copy_to_user(rs485_user, &port->rs485, sizeof(port->rs485))) 1407a5f276f1SRicardo Ribalda Delgado return -EFAULT; 1408a5f276f1SRicardo Ribalda Delgado 1409a5f276f1SRicardo Ribalda Delgado return 0; 1410a5f276f1SRicardo Ribalda Delgado } 1411a5f276f1SRicardo Ribalda Delgado 1412ad8c0eaaSNicolas Ferre static int uart_get_iso7816_config(struct uart_port *port, 1413ad8c0eaaSNicolas Ferre struct serial_iso7816 __user *iso7816) 1414ad8c0eaaSNicolas Ferre { 1415ad8c0eaaSNicolas Ferre unsigned long flags; 1416ad8c0eaaSNicolas Ferre struct serial_iso7816 aux; 1417ad8c0eaaSNicolas Ferre 1418ad8c0eaaSNicolas Ferre if (!port->iso7816_config) 141979c5966cSJohan Hovold return -ENOTTY; 1420ad8c0eaaSNicolas Ferre 1421ad8c0eaaSNicolas Ferre spin_lock_irqsave(&port->lock, flags); 1422ad8c0eaaSNicolas Ferre aux = port->iso7816; 1423ad8c0eaaSNicolas Ferre spin_unlock_irqrestore(&port->lock, flags); 1424ad8c0eaaSNicolas Ferre 1425ad8c0eaaSNicolas Ferre if (copy_to_user(iso7816, &aux, sizeof(aux))) 1426ad8c0eaaSNicolas Ferre return -EFAULT; 1427ad8c0eaaSNicolas Ferre 1428ad8c0eaaSNicolas Ferre return 0; 1429ad8c0eaaSNicolas Ferre } 1430ad8c0eaaSNicolas Ferre 1431ad8c0eaaSNicolas Ferre static int uart_set_iso7816_config(struct uart_port *port, 1432ad8c0eaaSNicolas Ferre struct serial_iso7816 __user *iso7816_user) 1433ad8c0eaaSNicolas Ferre { 1434ad8c0eaaSNicolas Ferre struct serial_iso7816 iso7816; 1435ad8c0eaaSNicolas Ferre int i, ret; 1436ad8c0eaaSNicolas Ferre unsigned long flags; 1437ad8c0eaaSNicolas Ferre 1438ad8c0eaaSNicolas Ferre if (!port->iso7816_config) 143979c5966cSJohan Hovold return -ENOTTY; 1440ad8c0eaaSNicolas Ferre 1441ad8c0eaaSNicolas Ferre if (copy_from_user(&iso7816, iso7816_user, sizeof(*iso7816_user))) 1442ad8c0eaaSNicolas Ferre return -EFAULT; 1443ad8c0eaaSNicolas Ferre 1444ad8c0eaaSNicolas Ferre /* 1445ad8c0eaaSNicolas Ferre * There are 5 words reserved for future use. Check that userspace 1446ad8c0eaaSNicolas Ferre * doesn't put stuff in there to prevent breakages in the future. 1447ad8c0eaaSNicolas Ferre */ 1448ad8c0eaaSNicolas Ferre for (i = 0; i < 5; i++) 1449ad8c0eaaSNicolas Ferre if (iso7816.reserved[i]) 1450ad8c0eaaSNicolas Ferre return -EINVAL; 1451ad8c0eaaSNicolas Ferre 1452ad8c0eaaSNicolas Ferre spin_lock_irqsave(&port->lock, flags); 1453ad8c0eaaSNicolas Ferre ret = port->iso7816_config(port, &iso7816); 1454ad8c0eaaSNicolas Ferre spin_unlock_irqrestore(&port->lock, flags); 1455ad8c0eaaSNicolas Ferre if (ret) 1456ad8c0eaaSNicolas Ferre return ret; 1457ad8c0eaaSNicolas Ferre 1458ad8c0eaaSNicolas Ferre if (copy_to_user(iso7816_user, &port->iso7816, sizeof(port->iso7816))) 1459ad8c0eaaSNicolas Ferre return -EFAULT; 1460ad8c0eaaSNicolas Ferre 1461ad8c0eaaSNicolas Ferre return 0; 1462ad8c0eaaSNicolas Ferre } 1463ad8c0eaaSNicolas Ferre 1464ab4382d2SGreg Kroah-Hartman /* 1465ab4382d2SGreg Kroah-Hartman * Called via sys_ioctl. We can use spin_lock_irq() here. 1466ab4382d2SGreg Kroah-Hartman */ 1467ab4382d2SGreg Kroah-Hartman static int 14684047b371SPeter Hurley uart_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg) 1469ab4382d2SGreg Kroah-Hartman { 1470ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1471ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 14724047b371SPeter Hurley struct uart_port *uport; 1473ab4382d2SGreg Kroah-Hartman void __user *uarg = (void __user *)arg; 1474ab4382d2SGreg Kroah-Hartman int ret = -ENOIOCTLCMD; 1475ab4382d2SGreg Kroah-Hartman 1476ab4382d2SGreg Kroah-Hartman 1477ab4382d2SGreg Kroah-Hartman /* 1478ab4382d2SGreg Kroah-Hartman * These ioctls don't rely on the hardware to be present. 1479ab4382d2SGreg Kroah-Hartman */ 1480ab4382d2SGreg Kroah-Hartman switch (cmd) { 1481ab4382d2SGreg Kroah-Hartman case TIOCSERCONFIG: 14827c8ab967SPeter Hurley down_write(&tty->termios_rwsem); 1483ab4382d2SGreg Kroah-Hartman ret = uart_do_autoconfig(tty, state); 14847c8ab967SPeter Hurley up_write(&tty->termios_rwsem); 1485ab4382d2SGreg Kroah-Hartman break; 1486ab4382d2SGreg Kroah-Hartman } 1487ab4382d2SGreg Kroah-Hartman 1488ab4382d2SGreg Kroah-Hartman if (ret != -ENOIOCTLCMD) 1489ab4382d2SGreg Kroah-Hartman goto out; 1490ab4382d2SGreg Kroah-Hartman 149118900ca6SPeter Hurley if (tty_io_error(tty)) { 1492ab4382d2SGreg Kroah-Hartman ret = -EIO; 1493ab4382d2SGreg Kroah-Hartman goto out; 1494ab4382d2SGreg Kroah-Hartman } 1495ab4382d2SGreg Kroah-Hartman 1496ab4382d2SGreg Kroah-Hartman /* 1497ab4382d2SGreg Kroah-Hartman * The following should only be used when hardware is present. 1498ab4382d2SGreg Kroah-Hartman */ 1499ab4382d2SGreg Kroah-Hartman switch (cmd) { 1500ab4382d2SGreg Kroah-Hartman case TIOCMIWAIT: 1501ab4382d2SGreg Kroah-Hartman ret = uart_wait_modem_status(state, arg); 1502ab4382d2SGreg Kroah-Hartman break; 1503ab4382d2SGreg Kroah-Hartman } 1504ab4382d2SGreg Kroah-Hartman 1505ab4382d2SGreg Kroah-Hartman if (ret != -ENOIOCTLCMD) 1506ab4382d2SGreg Kroah-Hartman goto out; 1507ab4382d2SGreg Kroah-Hartman 1508ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 15094047b371SPeter Hurley uport = uart_port_check(state); 1510ab4382d2SGreg Kroah-Hartman 15114047b371SPeter Hurley if (!uport || tty_io_error(tty)) { 1512ab4382d2SGreg Kroah-Hartman ret = -EIO; 1513ab4382d2SGreg Kroah-Hartman goto out_up; 1514ab4382d2SGreg Kroah-Hartman } 1515ab4382d2SGreg Kroah-Hartman 1516ab4382d2SGreg Kroah-Hartman /* 1517ab4382d2SGreg Kroah-Hartman * All these rely on hardware being present and need to be 1518ab4382d2SGreg Kroah-Hartman * protected against the tty being hung up. 1519ab4382d2SGreg Kroah-Hartman */ 1520a9c20a9cSRicardo Ribalda Delgado 1521ab4382d2SGreg Kroah-Hartman switch (cmd) { 1522a9c20a9cSRicardo Ribalda Delgado case TIOCSERGETLSR: /* Get line status register */ 1523a9c20a9cSRicardo Ribalda Delgado ret = uart_get_lsr_info(tty, state, uarg); 1524a9c20a9cSRicardo Ribalda Delgado break; 1525a9c20a9cSRicardo Ribalda Delgado 1526a5f276f1SRicardo Ribalda Delgado case TIOCGRS485: 15274047b371SPeter Hurley ret = uart_get_rs485_config(uport, uarg); 1528a5f276f1SRicardo Ribalda Delgado break; 1529a5f276f1SRicardo Ribalda Delgado 1530a5f276f1SRicardo Ribalda Delgado case TIOCSRS485: 15314047b371SPeter Hurley ret = uart_set_rs485_config(uport, uarg); 1532a5f276f1SRicardo Ribalda Delgado break; 1533ad8c0eaaSNicolas Ferre 1534ad8c0eaaSNicolas Ferre case TIOCSISO7816: 1535ad8c0eaaSNicolas Ferre ret = uart_set_iso7816_config(state->uart_port, uarg); 1536ad8c0eaaSNicolas Ferre break; 1537ad8c0eaaSNicolas Ferre 1538ad8c0eaaSNicolas Ferre case TIOCGISO7816: 1539ad8c0eaaSNicolas Ferre ret = uart_get_iso7816_config(state->uart_port, uarg); 1540ad8c0eaaSNicolas Ferre break; 15414047b371SPeter Hurley default: 1542ab4382d2SGreg Kroah-Hartman if (uport->ops->ioctl) 1543ab4382d2SGreg Kroah-Hartman ret = uport->ops->ioctl(uport, cmd, arg); 1544ab4382d2SGreg Kroah-Hartman break; 1545ab4382d2SGreg Kroah-Hartman } 1546ab4382d2SGreg Kroah-Hartman out_up: 1547ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1548ab4382d2SGreg Kroah-Hartman out: 1549ab4382d2SGreg Kroah-Hartman return ret; 1550ab4382d2SGreg Kroah-Hartman } 1551ab4382d2SGreg Kroah-Hartman 1552ab4382d2SGreg Kroah-Hartman static void uart_set_ldisc(struct tty_struct *tty) 1553ab4382d2SGreg Kroah-Hartman { 1554ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 15554047b371SPeter Hurley struct uart_port *uport; 15562f70e49eSAlexey Kardashevskiy struct tty_port *port = &state->port; 15572f70e49eSAlexey Kardashevskiy 15582f70e49eSAlexey Kardashevskiy if (!tty_port_initialized(port)) 15592f70e49eSAlexey Kardashevskiy return; 1560ab4382d2SGreg Kroah-Hartman 1561db1b9dfcSPeter Hurley mutex_lock(&state->port.mutex); 15624047b371SPeter Hurley uport = uart_port_check(state); 15634047b371SPeter Hurley if (uport && uport->ops->set_ldisc) 1564732a84a0SPeter Hurley uport->ops->set_ldisc(uport, &tty->termios); 1565db1b9dfcSPeter Hurley mutex_unlock(&state->port.mutex); 1566db1b9dfcSPeter Hurley } 1567ab4382d2SGreg Kroah-Hartman 1568ab4382d2SGreg Kroah-Hartman static void uart_set_termios(struct tty_struct *tty, 1569ab4382d2SGreg Kroah-Hartman struct ktermios *old_termios) 1570ab4382d2SGreg Kroah-Hartman { 1571ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 15724047b371SPeter Hurley struct uart_port *uport; 1573adc8d746SAlan Cox unsigned int cflag = tty->termios.c_cflag; 15742cbacafdSRussell King unsigned int iflag_mask = IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK; 15752cbacafdSRussell King bool sw_changed = false; 1576ab4382d2SGreg Kroah-Hartman 15774047b371SPeter Hurley mutex_lock(&state->port.mutex); 15784047b371SPeter Hurley uport = uart_port_check(state); 15794047b371SPeter Hurley if (!uport) 15804047b371SPeter Hurley goto out; 15814047b371SPeter Hurley 15822cbacafdSRussell King /* 15832cbacafdSRussell King * Drivers doing software flow control also need to know 15842cbacafdSRussell King * about changes to these input settings. 15852cbacafdSRussell King */ 15862cbacafdSRussell King if (uport->flags & UPF_SOFT_FLOW) { 15872cbacafdSRussell King iflag_mask |= IXANY|IXON|IXOFF; 15882cbacafdSRussell King sw_changed = 15892cbacafdSRussell King tty->termios.c_cc[VSTART] != old_termios->c_cc[VSTART] || 15902cbacafdSRussell King tty->termios.c_cc[VSTOP] != old_termios->c_cc[VSTOP]; 15912cbacafdSRussell King } 1592ab4382d2SGreg Kroah-Hartman 1593ab4382d2SGreg Kroah-Hartman /* 1594ab4382d2SGreg Kroah-Hartman * These are the bits that are used to setup various 1595ab4382d2SGreg Kroah-Hartman * flags in the low level driver. We can ignore the Bfoo 1596ab4382d2SGreg Kroah-Hartman * bits in c_cflag; c_[io]speed will always be set 1597ab4382d2SGreg Kroah-Hartman * appropriately by set_termios() in tty_ioctl.c 1598ab4382d2SGreg Kroah-Hartman */ 1599ab4382d2SGreg Kroah-Hartman if ((cflag ^ old_termios->c_cflag) == 0 && 1600adc8d746SAlan Cox tty->termios.c_ospeed == old_termios->c_ospeed && 1601adc8d746SAlan Cox tty->termios.c_ispeed == old_termios->c_ispeed && 16022cbacafdSRussell King ((tty->termios.c_iflag ^ old_termios->c_iflag) & iflag_mask) == 0 && 16032cbacafdSRussell King !sw_changed) { 16044047b371SPeter Hurley goto out; 1605ab4382d2SGreg Kroah-Hartman } 1606ab4382d2SGreg Kroah-Hartman 1607ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, old_termios); 1608c7a6b9e4SHariprasad Kelam /* reload cflag from termios; port driver may have overridden flags */ 1609c18b55fdSPeter Hurley cflag = tty->termios.c_cflag; 1610ab4382d2SGreg Kroah-Hartman 1611ab4382d2SGreg Kroah-Hartman /* Handle transition to B0 status */ 1612ab4382d2SGreg Kroah-Hartman if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) 1613dec94e70SRussell King uart_clear_mctrl(uport, TIOCM_RTS | TIOCM_DTR); 1614ab4382d2SGreg Kroah-Hartman /* Handle transition away from B0 status */ 1615ab4382d2SGreg Kroah-Hartman else if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { 1616ab4382d2SGreg Kroah-Hartman unsigned int mask = TIOCM_DTR; 16174ed71addSTamseel Shams 161897ef38b8SPeter Hurley if (!(cflag & CRTSCTS) || !tty_throttled(tty)) 1619ab4382d2SGreg Kroah-Hartman mask |= TIOCM_RTS; 1620dec94e70SRussell King uart_set_mctrl(uport, mask); 1621ab4382d2SGreg Kroah-Hartman } 16224047b371SPeter Hurley out: 16234047b371SPeter Hurley mutex_unlock(&state->port.mutex); 1624ab4382d2SGreg Kroah-Hartman } 1625ab4382d2SGreg Kroah-Hartman 1626ab4382d2SGreg Kroah-Hartman /* 1627ef4f527cSKevin Cernekee * Calls to uart_close() are serialised via the tty_lock in 1628ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:tty_release() 1629ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:do_tty_hangup() 1630ab4382d2SGreg Kroah-Hartman */ 1631ab4382d2SGreg Kroah-Hartman static void uart_close(struct tty_struct *tty, struct file *filp) 1632ab4382d2SGreg Kroah-Hartman { 1633ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1634ab4382d2SGreg Kroah-Hartman 163591b32f54SPeter Hurley if (!state) { 163691b32f54SPeter Hurley struct uart_driver *drv = tty->driver->driver_state; 16379356335fSColin Ian King struct tty_port *port; 163891b32f54SPeter Hurley 163991b32f54SPeter Hurley state = drv->state + tty->index; 164091b32f54SPeter Hurley port = &state->port; 164191b32f54SPeter Hurley spin_lock_irq(&port->lock); 164291b32f54SPeter Hurley --port->count; 164391b32f54SPeter Hurley spin_unlock_irq(&port->lock); 1644ab4382d2SGreg Kroah-Hartman return; 164591b32f54SPeter Hurley } 1646ab4382d2SGreg Kroah-Hartman 164739b3d892SPeter Hurley pr_debug("uart_close(%d) called\n", tty->index); 1648ab4382d2SGreg Kroah-Hartman 1649761ed4a9SRob Herring tty_port_close(tty->port, tty, filp); 1650761ed4a9SRob Herring } 1651ab4382d2SGreg Kroah-Hartman 1652761ed4a9SRob Herring static void uart_tty_port_shutdown(struct tty_port *port) 1653761ed4a9SRob Herring { 1654761ed4a9SRob Herring struct uart_state *state = container_of(port, struct uart_state, port); 1655761ed4a9SRob Herring struct uart_port *uport = uart_port_check(state); 165600de977fSJohan Hovold char *buf; 1657af224ca2SPeter Hurley 1658ab4382d2SGreg Kroah-Hartman /* 1659ab4382d2SGreg Kroah-Hartman * At this point, we stop accepting input. To do this, we 1660ab4382d2SGreg Kroah-Hartman * disable the receive line status interrupts. 1661ab4382d2SGreg Kroah-Hartman */ 1662a5a2b130SAndy Shevchenko if (WARN(!uport, "detached port still initialized!\n")) 1663a5a2b130SAndy Shevchenko return; 1664761ed4a9SRob Herring 1665a5a2b130SAndy Shevchenko spin_lock_irq(&uport->lock); 1666ab4382d2SGreg Kroah-Hartman uport->ops->stop_rx(uport); 16676fb98fb3SPeter Hurley spin_unlock_irq(&uport->lock); 1668761ed4a9SRob Herring 1669761ed4a9SRob Herring uart_port_shutdown(port); 1670761ed4a9SRob Herring 1671ab4382d2SGreg Kroah-Hartman /* 1672761ed4a9SRob Herring * It's possible for shutdown to be called after suspend if we get 1673761ed4a9SRob Herring * a DCD drop (hangup) at just the right time. Clear suspended bit so 1674761ed4a9SRob Herring * we don't try to resume a port that has been shutdown. 1675ab4382d2SGreg Kroah-Hartman */ 1676761ed4a9SRob Herring tty_port_set_suspended(port, 0); 1677ab4382d2SGreg Kroah-Hartman 167800de977fSJohan Hovold /* 167900de977fSJohan Hovold * Free the transmit buffer. 168000de977fSJohan Hovold */ 168100de977fSJohan Hovold spin_lock_irq(&uport->lock); 168200de977fSJohan Hovold buf = state->xmit.buf; 168300de977fSJohan Hovold state->xmit.buf = NULL; 168400de977fSJohan Hovold spin_unlock_irq(&uport->lock); 1685ab4382d2SGreg Kroah-Hartman 168600de977fSJohan Hovold free_page((unsigned long)buf); 168700de977fSJohan Hovold 168800de977fSJohan Hovold uart_change_pm(state, UART_PM_STATE_OFF); 1689ab4382d2SGreg Kroah-Hartman } 1690ab4382d2SGreg Kroah-Hartman 16911f33a51dSJiri Slaby static void uart_wait_until_sent(struct tty_struct *tty, int timeout) 1692ab4382d2SGreg Kroah-Hartman { 16931f33a51dSJiri Slaby struct uart_state *state = tty->driver_data; 16949ed19428SPeter Hurley struct uart_port *port; 1695*f9008285SIlpo Järvinen unsigned long char_time, expire, fifo_timeout; 1696ab4382d2SGreg Kroah-Hartman 16979ed19428SPeter Hurley port = uart_port_ref(state); 1698ef510beaSAndy Shevchenko if (!port) 1699ef510beaSAndy Shevchenko return; 1700ef510beaSAndy Shevchenko 1701ef510beaSAndy Shevchenko if (port->type == PORT_UNKNOWN || port->fifosize == 0) { 17029ed19428SPeter Hurley uart_port_deref(port); 1703ab4382d2SGreg Kroah-Hartman return; 17049ed19428SPeter Hurley } 1705ab4382d2SGreg Kroah-Hartman 1706ab4382d2SGreg Kroah-Hartman /* 1707ab4382d2SGreg Kroah-Hartman * Set the check interval to be 1/5 of the estimated time to 1708ab4382d2SGreg Kroah-Hartman * send a single character, and make it at least 1. The check 1709ab4382d2SGreg Kroah-Hartman * interval should also be less than the timeout. 1710ab4382d2SGreg Kroah-Hartman * 1711ab4382d2SGreg Kroah-Hartman * Note: we have to use pretty tight timings here to satisfy 1712ab4382d2SGreg Kroah-Hartman * the NIST-PCTS. 1713ab4382d2SGreg Kroah-Hartman */ 171431f6bd7fSIlpo Järvinen char_time = max(nsecs_to_jiffies(port->frame_time / 5), 1UL); 171531f6bd7fSIlpo Järvinen 1716ab4382d2SGreg Kroah-Hartman if (timeout && timeout < char_time) 1717ab4382d2SGreg Kroah-Hartman char_time = timeout; 1718ab4382d2SGreg Kroah-Hartman 1719b0e0bd9dSTomasz Moń if (!uart_cts_enabled(port)) { 1720ab4382d2SGreg Kroah-Hartman /* 1721ab4382d2SGreg Kroah-Hartman * If the transmitter hasn't cleared in twice the approximate 1722ab4382d2SGreg Kroah-Hartman * amount of time to send the entire FIFO, it probably won't 1723ab4382d2SGreg Kroah-Hartman * ever clear. This assumes the UART isn't doing flow 1724ab4382d2SGreg Kroah-Hartman * control, which is currently the case. Hence, if it ever 1725*f9008285SIlpo Järvinen * takes longer than FIFO timeout, this is probably due to a 1726ab4382d2SGreg Kroah-Hartman * UART bug of some kind. So, we clamp the timeout parameter at 1727*f9008285SIlpo Järvinen * 2 * FIFO timeout. 1728ab4382d2SGreg Kroah-Hartman */ 1729*f9008285SIlpo Järvinen fifo_timeout = uart_fifo_timeout(port); 1730*f9008285SIlpo Järvinen if (timeout == 0 || timeout > 2 * fifo_timeout) 1731*f9008285SIlpo Järvinen timeout = 2 * fifo_timeout; 1732b0e0bd9dSTomasz Moń } 1733ab4382d2SGreg Kroah-Hartman 1734ab4382d2SGreg Kroah-Hartman expire = jiffies + timeout; 1735ab4382d2SGreg Kroah-Hartman 1736ab4382d2SGreg Kroah-Hartman pr_debug("uart_wait_until_sent(%d), jiffies=%lu, expire=%lu...\n", 1737ab4382d2SGreg Kroah-Hartman port->line, jiffies, expire); 1738ab4382d2SGreg Kroah-Hartman 1739ab4382d2SGreg Kroah-Hartman /* 1740ab4382d2SGreg Kroah-Hartman * Check whether the transmitter is empty every 'char_time'. 1741ab4382d2SGreg Kroah-Hartman * 'timeout' / 'expire' give us the maximum amount of time 1742ab4382d2SGreg Kroah-Hartman * we wait. 1743ab4382d2SGreg Kroah-Hartman */ 1744ab4382d2SGreg Kroah-Hartman while (!port->ops->tx_empty(port)) { 1745ab4382d2SGreg Kroah-Hartman msleep_interruptible(jiffies_to_msecs(char_time)); 1746ab4382d2SGreg Kroah-Hartman if (signal_pending(current)) 1747ab4382d2SGreg Kroah-Hartman break; 1748b0e0bd9dSTomasz Moń if (timeout && time_after(jiffies, expire)) 1749ab4382d2SGreg Kroah-Hartman break; 1750ab4382d2SGreg Kroah-Hartman } 17519ed19428SPeter Hurley uart_port_deref(port); 1752ab4382d2SGreg Kroah-Hartman } 1753ab4382d2SGreg Kroah-Hartman 1754ab4382d2SGreg Kroah-Hartman /* 1755ef4f527cSKevin Cernekee * Calls to uart_hangup() are serialised by the tty_lock in 1756ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:do_tty_hangup() 1757ef4f527cSKevin Cernekee * This runs from a workqueue and can sleep for a _short_ time only. 1758ab4382d2SGreg Kroah-Hartman */ 1759ab4382d2SGreg Kroah-Hartman static void uart_hangup(struct tty_struct *tty) 1760ab4382d2SGreg Kroah-Hartman { 1761ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1762ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1763af224ca2SPeter Hurley struct uart_port *uport; 1764ab4382d2SGreg Kroah-Hartman unsigned long flags; 1765ab4382d2SGreg Kroah-Hartman 176639b3d892SPeter Hurley pr_debug("uart_hangup(%d)\n", tty->index); 1767ab4382d2SGreg Kroah-Hartman 1768ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1769af224ca2SPeter Hurley uport = uart_port_check(state); 1770af224ca2SPeter Hurley WARN(!uport, "hangup of detached port!\n"); 1771af224ca2SPeter Hurley 1772807c8d81SPeter Hurley if (tty_port_active(port)) { 1773ab4382d2SGreg Kroah-Hartman uart_flush_buffer(tty); 1774ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 1775ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 1776ab4382d2SGreg Kroah-Hartman port->count = 0; 1777ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 1778807c8d81SPeter Hurley tty_port_set_active(port, 0); 1779ab4382d2SGreg Kroah-Hartman tty_port_tty_set(port, NULL); 1780af224ca2SPeter Hurley if (uport && !uart_console(uport)) 1781bf903c0cSGeert Uytterhoeven uart_change_pm(state, UART_PM_STATE_OFF); 1782ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->open_wait); 1783ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->delta_msr_wait); 1784ab4382d2SGreg Kroah-Hartman } 1785ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1786ab4382d2SGreg Kroah-Hartman } 1787ab4382d2SGreg Kroah-Hartman 1788af224ca2SPeter Hurley /* uport == NULL if uart_port has already been removed */ 17890b1db830SJiri Slaby static void uart_port_shutdown(struct tty_port *port) 17900b1db830SJiri Slaby { 1791b922e19dSJiri Slaby struct uart_state *state = container_of(port, struct uart_state, port); 17924047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 1793b922e19dSJiri Slaby 1794b922e19dSJiri Slaby /* 1795b922e19dSJiri Slaby * clear delta_msr_wait queue to avoid mem leaks: we may free 1796b922e19dSJiri Slaby * the irq here so the queue might never be woken up. Note 1797b922e19dSJiri Slaby * that we won't end up waiting on delta_msr_wait again since 1798b922e19dSJiri Slaby * any outstanding file descriptors should be pointing at 1799b922e19dSJiri Slaby * hung_up_tty_fops now. 1800b922e19dSJiri Slaby */ 1801b922e19dSJiri Slaby wake_up_interruptible(&port->delta_msr_wait); 1802b922e19dSJiri Slaby 18032765852eSJiri Slaby if (uport) { 18042765852eSJiri Slaby /* Free the IRQ and disable the port. */ 1805b922e19dSJiri Slaby uport->ops->shutdown(uport); 1806b922e19dSJiri Slaby 18072765852eSJiri Slaby /* Ensure that the IRQ handler isn't running on another CPU. */ 1808b922e19dSJiri Slaby synchronize_irq(uport->irq); 18090b1db830SJiri Slaby } 18102765852eSJiri Slaby } 18110b1db830SJiri Slaby 1812ab4382d2SGreg Kroah-Hartman static int uart_carrier_raised(struct tty_port *port) 1813ab4382d2SGreg Kroah-Hartman { 1814ab4382d2SGreg Kroah-Hartman struct uart_state *state = container_of(port, struct uart_state, port); 18159ed19428SPeter Hurley struct uart_port *uport; 1816ab4382d2SGreg Kroah-Hartman int mctrl; 18179ed19428SPeter Hurley 18189ed19428SPeter Hurley uport = uart_port_ref(state); 18199ed19428SPeter Hurley /* 18209ed19428SPeter Hurley * Should never observe uport == NULL since checks for hangup should 18219ed19428SPeter Hurley * abort the tty_port_block_til_ready() loop before checking for carrier 18229ed19428SPeter Hurley * raised -- but report carrier raised if it does anyway so open will 18239ed19428SPeter Hurley * continue and not sleep 18249ed19428SPeter Hurley */ 18259ed19428SPeter Hurley if (WARN_ON(!uport)) 18269ed19428SPeter Hurley return 1; 1827ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 18281fdc3106SAlexander Shiyan uart_enable_ms(uport); 1829ab4382d2SGreg Kroah-Hartman mctrl = uport->ops->get_mctrl(uport); 1830ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 18319ed19428SPeter Hurley uart_port_deref(uport); 1832ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_CAR) 1833ab4382d2SGreg Kroah-Hartman return 1; 1834ab4382d2SGreg Kroah-Hartman return 0; 1835ab4382d2SGreg Kroah-Hartman } 1836ab4382d2SGreg Kroah-Hartman 1837a6845e1eSRafael Gago static void uart_dtr_rts(struct tty_port *port, int raise) 1838ab4382d2SGreg Kroah-Hartman { 1839ab4382d2SGreg Kroah-Hartman struct uart_state *state = container_of(port, struct uart_state, port); 18409ed19428SPeter Hurley struct uart_port *uport; 18419ed19428SPeter Hurley 18429ed19428SPeter Hurley uport = uart_port_ref(state); 18439ed19428SPeter Hurley if (!uport) 18449ed19428SPeter Hurley return; 1845a6845e1eSRafael Gago uart_port_dtr_rts(uport, raise); 18469ed19428SPeter Hurley uart_port_deref(uport); 1847ab4382d2SGreg Kroah-Hartman } 1848ab4382d2SGreg Kroah-Hartman 18494cdd17baSJiri Slaby static int uart_install(struct tty_driver *driver, struct tty_struct *tty) 18504cdd17baSJiri Slaby { 18514cdd17baSJiri Slaby struct uart_driver *drv = driver->driver_state; 18524cdd17baSJiri Slaby struct uart_state *state = drv->state + tty->index; 18534cdd17baSJiri Slaby 18544cdd17baSJiri Slaby tty->driver_data = state; 18554cdd17baSJiri Slaby 18564cdd17baSJiri Slaby return tty_standard_install(driver, tty); 18574cdd17baSJiri Slaby } 18584cdd17baSJiri Slaby 1859ab4382d2SGreg Kroah-Hartman /* 1860ef4f527cSKevin Cernekee * Calls to uart_open are serialised by the tty_lock in 1861ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:tty_open() 1862ab4382d2SGreg Kroah-Hartman * Note that if this fails, then uart_close() _will_ be called. 1863ab4382d2SGreg Kroah-Hartman * 1864ab4382d2SGreg Kroah-Hartman * In time, we want to scrap the "opening nonpresent ports" 1865ab4382d2SGreg Kroah-Hartman * behaviour and implement an alternative way for setserial 1866ab4382d2SGreg Kroah-Hartman * to set base addresses/ports/types. This will allow us to 1867ab4382d2SGreg Kroah-Hartman * get rid of a certain amount of extra tests. 1868ab4382d2SGreg Kroah-Hartman */ 1869ab4382d2SGreg Kroah-Hartman static int uart_open(struct tty_struct *tty, struct file *filp) 1870ab4382d2SGreg Kroah-Hartman { 18714cdd17baSJiri Slaby struct uart_state *state = tty->driver_data; 18724cdd17baSJiri Slaby int retval; 1873b3b57646SRob Herring 1874b3b57646SRob Herring retval = tty_port_open(&state->port, tty, filp); 1875b3b57646SRob Herring if (retval > 0) 1876b3b57646SRob Herring retval = 0; 1877b3b57646SRob Herring 1878b3b57646SRob Herring return retval; 1879b3b57646SRob Herring } 1880b3b57646SRob Herring 1881b3b57646SRob Herring static int uart_port_activate(struct tty_port *port, struct tty_struct *tty) 1882b3b57646SRob Herring { 1883b3b57646SRob Herring struct uart_state *state = container_of(port, struct uart_state, port); 1884b3b57646SRob Herring struct uart_port *uport; 188513b18d35SSerge Semin int ret; 1886b3b57646SRob Herring 1887b3b57646SRob Herring uport = uart_port_check(state); 1888b3b57646SRob Herring if (!uport || uport->flags & UPF_DEAD) 1889b3b57646SRob Herring return -ENXIO; 1890b3b57646SRob Herring 1891ab4382d2SGreg Kroah-Hartman /* 1892ab4382d2SGreg Kroah-Hartman * Start up the serial port. 1893ab4382d2SGreg Kroah-Hartman */ 189413b18d35SSerge Semin ret = uart_startup(tty, state, 0); 189513b18d35SSerge Semin if (ret > 0) 189613b18d35SSerge Semin tty_port_set_active(port, 1); 189713b18d35SSerge Semin 189813b18d35SSerge Semin return ret; 1899ab4382d2SGreg Kroah-Hartman } 1900ab4382d2SGreg Kroah-Hartman 1901ab4382d2SGreg Kroah-Hartman static const char *uart_type(struct uart_port *port) 1902ab4382d2SGreg Kroah-Hartman { 1903ab4382d2SGreg Kroah-Hartman const char *str = NULL; 1904ab4382d2SGreg Kroah-Hartman 1905ab4382d2SGreg Kroah-Hartman if (port->ops->type) 1906ab4382d2SGreg Kroah-Hartman str = port->ops->type(port); 1907ab4382d2SGreg Kroah-Hartman 1908ab4382d2SGreg Kroah-Hartman if (!str) 1909ab4382d2SGreg Kroah-Hartman str = "unknown"; 1910ab4382d2SGreg Kroah-Hartman 1911ab4382d2SGreg Kroah-Hartman return str; 1912ab4382d2SGreg Kroah-Hartman } 1913ab4382d2SGreg Kroah-Hartman 1914ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_PROC_FS 1915ab4382d2SGreg Kroah-Hartman 1916ab4382d2SGreg Kroah-Hartman static void uart_line_info(struct seq_file *m, struct uart_driver *drv, int i) 1917ab4382d2SGreg Kroah-Hartman { 1918ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + i; 1919ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 19206f538fe3SLinus Walleij enum uart_pm_state pm_state; 19214047b371SPeter Hurley struct uart_port *uport; 1922ab4382d2SGreg Kroah-Hartman char stat_buf[32]; 1923ab4382d2SGreg Kroah-Hartman unsigned int status; 1924ab4382d2SGreg Kroah-Hartman int mmio; 1925ab4382d2SGreg Kroah-Hartman 19264047b371SPeter Hurley mutex_lock(&port->mutex); 19274047b371SPeter Hurley uport = uart_port_check(state); 1928ab4382d2SGreg Kroah-Hartman if (!uport) 19294047b371SPeter Hurley goto out; 1930ab4382d2SGreg Kroah-Hartman 1931ab4382d2SGreg Kroah-Hartman mmio = uport->iotype >= UPIO_MEM; 1932ab4382d2SGreg Kroah-Hartman seq_printf(m, "%d: uart:%s %s%08llX irq:%d", 1933ab4382d2SGreg Kroah-Hartman uport->line, uart_type(uport), 1934ab4382d2SGreg Kroah-Hartman mmio ? "mmio:0x" : "port:", 1935ab4382d2SGreg Kroah-Hartman mmio ? (unsigned long long)uport->mapbase 1936ab4382d2SGreg Kroah-Hartman : (unsigned long long)uport->iobase, 1937ab4382d2SGreg Kroah-Hartman uport->irq); 1938ab4382d2SGreg Kroah-Hartman 1939ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) { 1940ab4382d2SGreg Kroah-Hartman seq_putc(m, '\n'); 19414047b371SPeter Hurley goto out; 1942ab4382d2SGreg Kroah-Hartman } 1943ab4382d2SGreg Kroah-Hartman 1944ab4382d2SGreg Kroah-Hartman if (capable(CAP_SYS_ADMIN)) { 1945ab4382d2SGreg Kroah-Hartman pm_state = state->pm_state; 19466f538fe3SLinus Walleij if (pm_state != UART_PM_STATE_ON) 19476f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 1948ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1949ab4382d2SGreg Kroah-Hartman status = uport->ops->get_mctrl(uport); 1950ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 19516f538fe3SLinus Walleij if (pm_state != UART_PM_STATE_ON) 1952ab4382d2SGreg Kroah-Hartman uart_change_pm(state, pm_state); 1953ab4382d2SGreg Kroah-Hartman 1954ab4382d2SGreg Kroah-Hartman seq_printf(m, " tx:%d rx:%d", 1955ab4382d2SGreg Kroah-Hartman uport->icount.tx, uport->icount.rx); 1956ab4382d2SGreg Kroah-Hartman if (uport->icount.frame) 1957968af298SPeter Hurley seq_printf(m, " fe:%d", uport->icount.frame); 1958ab4382d2SGreg Kroah-Hartman if (uport->icount.parity) 1959968af298SPeter Hurley seq_printf(m, " pe:%d", uport->icount.parity); 1960ab4382d2SGreg Kroah-Hartman if (uport->icount.brk) 1961968af298SPeter Hurley seq_printf(m, " brk:%d", uport->icount.brk); 1962ab4382d2SGreg Kroah-Hartman if (uport->icount.overrun) 1963968af298SPeter Hurley seq_printf(m, " oe:%d", uport->icount.overrun); 19644f794097SJeremy Kerr if (uport->icount.buf_overrun) 19654f794097SJeremy Kerr seq_printf(m, " bo:%d", uport->icount.buf_overrun); 1966ab4382d2SGreg Kroah-Hartman 1967ab4382d2SGreg Kroah-Hartman #define INFOBIT(bit, str) \ 1968ab4382d2SGreg Kroah-Hartman if (uport->mctrl & (bit)) \ 1969ab4382d2SGreg Kroah-Hartman strncat(stat_buf, (str), sizeof(stat_buf) - \ 1970ab4382d2SGreg Kroah-Hartman strlen(stat_buf) - 2) 1971ab4382d2SGreg Kroah-Hartman #define STATBIT(bit, str) \ 1972ab4382d2SGreg Kroah-Hartman if (status & (bit)) \ 1973ab4382d2SGreg Kroah-Hartman strncat(stat_buf, (str), sizeof(stat_buf) - \ 1974ab4382d2SGreg Kroah-Hartman strlen(stat_buf) - 2) 1975ab4382d2SGreg Kroah-Hartman 1976ab4382d2SGreg Kroah-Hartman stat_buf[0] = '\0'; 1977ab4382d2SGreg Kroah-Hartman stat_buf[1] = '\0'; 1978ab4382d2SGreg Kroah-Hartman INFOBIT(TIOCM_RTS, "|RTS"); 1979ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_CTS, "|CTS"); 1980ab4382d2SGreg Kroah-Hartman INFOBIT(TIOCM_DTR, "|DTR"); 1981ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_DSR, "|DSR"); 1982ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_CAR, "|CD"); 1983ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_RNG, "|RI"); 1984ab4382d2SGreg Kroah-Hartman if (stat_buf[0]) 1985ab4382d2SGreg Kroah-Hartman stat_buf[0] = ' '; 1986ab4382d2SGreg Kroah-Hartman 1987ab4382d2SGreg Kroah-Hartman seq_puts(m, stat_buf); 1988ab4382d2SGreg Kroah-Hartman } 1989ab4382d2SGreg Kroah-Hartman seq_putc(m, '\n'); 1990ab4382d2SGreg Kroah-Hartman #undef STATBIT 1991ab4382d2SGreg Kroah-Hartman #undef INFOBIT 19924047b371SPeter Hurley out: 19934047b371SPeter Hurley mutex_unlock(&port->mutex); 1994ab4382d2SGreg Kroah-Hartman } 1995ab4382d2SGreg Kroah-Hartman 1996ab4382d2SGreg Kroah-Hartman static int uart_proc_show(struct seq_file *m, void *v) 1997ab4382d2SGreg Kroah-Hartman { 1998ab4382d2SGreg Kroah-Hartman struct tty_driver *ttydrv = m->private; 1999ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = ttydrv->driver_state; 2000ab4382d2SGreg Kroah-Hartman int i; 2001ab4382d2SGreg Kroah-Hartman 2002968af298SPeter Hurley seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n", "", "", ""); 2003ab4382d2SGreg Kroah-Hartman for (i = 0; i < drv->nr; i++) 2004ab4382d2SGreg Kroah-Hartman uart_line_info(m, drv, i); 2005ab4382d2SGreg Kroah-Hartman return 0; 2006ab4382d2SGreg Kroah-Hartman } 2007ab4382d2SGreg Kroah-Hartman #endif 2008ab4382d2SGreg Kroah-Hartman 20097a49955aSAndy Shevchenko static inline bool uart_console_enabled(struct uart_port *port) 20107a49955aSAndy Shevchenko { 20117a49955aSAndy Shevchenko return uart_console(port) && (port->cons->flags & CON_ENABLED); 20127a49955aSAndy Shevchenko } 20137a49955aSAndy Shevchenko 2014e0830dbfSJohan Hovold static void uart_port_spin_lock_init(struct uart_port *port) 2015f743061aSAndy Shevchenko { 2016f743061aSAndy Shevchenko spin_lock_init(&port->lock); 2017f743061aSAndy Shevchenko lockdep_set_class(&port->lock, &port_lock_key); 2018f743061aSAndy Shevchenko } 2019f743061aSAndy Shevchenko 2020ab4382d2SGreg Kroah-Hartman #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL) 20211cfe42b7SPeter Hurley /** 2022ab4382d2SGreg Kroah-Hartman * uart_console_write - write a console message to a serial port 2023ab4382d2SGreg Kroah-Hartman * @port: the port to write the message 2024ab4382d2SGreg Kroah-Hartman * @s: array of characters 2025ab4382d2SGreg Kroah-Hartman * @count: number of characters in string to write 202610afbe34SPeter Hurley * @putchar: function to write character to port 2027ab4382d2SGreg Kroah-Hartman */ 2028ab4382d2SGreg Kroah-Hartman void uart_console_write(struct uart_port *port, const char *s, 2029ab4382d2SGreg Kroah-Hartman unsigned int count, 20303f8bab17SJiri Slaby void (*putchar)(struct uart_port *, unsigned char)) 2031ab4382d2SGreg Kroah-Hartman { 2032ab4382d2SGreg Kroah-Hartman unsigned int i; 2033ab4382d2SGreg Kroah-Hartman 2034ab4382d2SGreg Kroah-Hartman for (i = 0; i < count; i++, s++) { 2035ab4382d2SGreg Kroah-Hartman if (*s == '\n') 2036ab4382d2SGreg Kroah-Hartman putchar(port, '\r'); 2037ab4382d2SGreg Kroah-Hartman putchar(port, *s); 2038ab4382d2SGreg Kroah-Hartman } 2039ab4382d2SGreg Kroah-Hartman } 2040ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_console_write); 2041ab4382d2SGreg Kroah-Hartman 2042ab4382d2SGreg Kroah-Hartman /* 2043ab4382d2SGreg Kroah-Hartman * Check whether an invalid uart number has been specified, and 2044ab4382d2SGreg Kroah-Hartman * if so, search for the first available port that does have 2045ab4382d2SGreg Kroah-Hartman * console support. 2046ab4382d2SGreg Kroah-Hartman */ 2047ab4382d2SGreg Kroah-Hartman struct uart_port * __init 2048ab4382d2SGreg Kroah-Hartman uart_get_console(struct uart_port *ports, int nr, struct console *co) 2049ab4382d2SGreg Kroah-Hartman { 2050ab4382d2SGreg Kroah-Hartman int idx = co->index; 2051ab4382d2SGreg Kroah-Hartman 2052ab4382d2SGreg Kroah-Hartman if (idx < 0 || idx >= nr || (ports[idx].iobase == 0 && 2053ab4382d2SGreg Kroah-Hartman ports[idx].membase == NULL)) 2054ab4382d2SGreg Kroah-Hartman for (idx = 0; idx < nr; idx++) 2055ab4382d2SGreg Kroah-Hartman if (ports[idx].iobase != 0 || 2056ab4382d2SGreg Kroah-Hartman ports[idx].membase != NULL) 2057ab4382d2SGreg Kroah-Hartman break; 2058ab4382d2SGreg Kroah-Hartman 2059ab4382d2SGreg Kroah-Hartman co->index = idx; 2060ab4382d2SGreg Kroah-Hartman 2061ab4382d2SGreg Kroah-Hartman return ports + idx; 2062ab4382d2SGreg Kroah-Hartman } 2063ab4382d2SGreg Kroah-Hartman 2064ab4382d2SGreg Kroah-Hartman /** 206573abaf87SPeter Hurley * uart_parse_earlycon - Parse earlycon options 206673abaf87SPeter Hurley * @p: ptr to 2nd field (ie., just beyond '<name>,') 206773abaf87SPeter Hurley * @iotype: ptr for decoded iotype (out) 206873abaf87SPeter Hurley * @addr: ptr for decoded mapbase/iobase (out) 206973abaf87SPeter Hurley * @options: ptr for <options> field; NULL if not present (out) 207073abaf87SPeter Hurley * 207173abaf87SPeter Hurley * Decodes earlycon kernel command line parameters of the form 2072bd94c407SMasahiro Yamada * earlycon=<name>,io|mmio|mmio16|mmio32|mmio32be|mmio32native,<addr>,<options> 2073bd94c407SMasahiro Yamada * console=<name>,io|mmio|mmio16|mmio32|mmio32be|mmio32native,<addr>,<options> 207473abaf87SPeter Hurley * 207573abaf87SPeter Hurley * The optional form 2076ff30283aSRandy Dunlap * 207773abaf87SPeter Hurley * earlycon=<name>,0x<addr>,<options> 207873abaf87SPeter Hurley * console=<name>,0x<addr>,<options> 2079ff30283aSRandy Dunlap * 208073abaf87SPeter Hurley * is also accepted; the returned @iotype will be UPIO_MEM. 208173abaf87SPeter Hurley * 20828b2303deSAlexander Sverdlin * Returns 0 on success or -EINVAL on failure 208373abaf87SPeter Hurley */ 208446e36683SAlexander Sverdlin int uart_parse_earlycon(char *p, unsigned char *iotype, resource_size_t *addr, 208573abaf87SPeter Hurley char **options) 208673abaf87SPeter Hurley { 208773abaf87SPeter Hurley if (strncmp(p, "mmio,", 5) == 0) { 208873abaf87SPeter Hurley *iotype = UPIO_MEM; 208973abaf87SPeter Hurley p += 5; 2090bd94c407SMasahiro Yamada } else if (strncmp(p, "mmio16,", 7) == 0) { 2091bd94c407SMasahiro Yamada *iotype = UPIO_MEM16; 2092bd94c407SMasahiro Yamada p += 7; 209373abaf87SPeter Hurley } else if (strncmp(p, "mmio32,", 7) == 0) { 209473abaf87SPeter Hurley *iotype = UPIO_MEM32; 209573abaf87SPeter Hurley p += 7; 20966e63be3fSNoam Camus } else if (strncmp(p, "mmio32be,", 9) == 0) { 20976e63be3fSNoam Camus *iotype = UPIO_MEM32BE; 20986e63be3fSNoam Camus p += 9; 2099d215d809SMax Filippov } else if (strncmp(p, "mmio32native,", 13) == 0) { 2100d215d809SMax Filippov *iotype = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) ? 2101d215d809SMax Filippov UPIO_MEM32BE : UPIO_MEM32; 2102d215d809SMax Filippov p += 13; 210373abaf87SPeter Hurley } else if (strncmp(p, "io,", 3) == 0) { 210473abaf87SPeter Hurley *iotype = UPIO_PORT; 210573abaf87SPeter Hurley p += 3; 210673abaf87SPeter Hurley } else if (strncmp(p, "0x", 2) == 0) { 210773abaf87SPeter Hurley *iotype = UPIO_MEM; 210873abaf87SPeter Hurley } else { 210973abaf87SPeter Hurley return -EINVAL; 211073abaf87SPeter Hurley } 211173abaf87SPeter Hurley 21128b2303deSAlexander Sverdlin /* 21138b2303deSAlexander Sverdlin * Before you replace it with kstrtoull(), think about options separator 21148b2303deSAlexander Sverdlin * (',') it will not tolerate 21158b2303deSAlexander Sverdlin */ 21168b2303deSAlexander Sverdlin *addr = simple_strtoull(p, NULL, 0); 211773abaf87SPeter Hurley p = strchr(p, ','); 211873abaf87SPeter Hurley if (p) 211973abaf87SPeter Hurley p++; 212073abaf87SPeter Hurley 212173abaf87SPeter Hurley *options = p; 212273abaf87SPeter Hurley return 0; 212373abaf87SPeter Hurley } 212473abaf87SPeter Hurley EXPORT_SYMBOL_GPL(uart_parse_earlycon); 212573abaf87SPeter Hurley 212673abaf87SPeter Hurley /** 212702088ca6SGeert Uytterhoeven * uart_parse_options - Parse serial port baud/parity/bits/flow control. 2128ab4382d2SGreg Kroah-Hartman * @options: pointer to option string 2129ab4382d2SGreg Kroah-Hartman * @baud: pointer to an 'int' variable for the baud rate. 2130ab4382d2SGreg Kroah-Hartman * @parity: pointer to an 'int' variable for the parity. 2131ab4382d2SGreg Kroah-Hartman * @bits: pointer to an 'int' variable for the number of data bits. 2132ab4382d2SGreg Kroah-Hartman * @flow: pointer to an 'int' variable for the flow control character. 2133ab4382d2SGreg Kroah-Hartman * 2134ab4382d2SGreg Kroah-Hartman * uart_parse_options decodes a string containing the serial console 2135ab4382d2SGreg Kroah-Hartman * options. The format of the string is <baud><parity><bits><flow>, 2136ab4382d2SGreg Kroah-Hartman * eg: 115200n8r 2137ab4382d2SGreg Kroah-Hartman */ 2138ab4382d2SGreg Kroah-Hartman void 21390f646b63SPaul Cercueil uart_parse_options(const char *options, int *baud, int *parity, 21400f646b63SPaul Cercueil int *bits, int *flow) 2141ab4382d2SGreg Kroah-Hartman { 21420f646b63SPaul Cercueil const char *s = options; 2143ab4382d2SGreg Kroah-Hartman 2144ab4382d2SGreg Kroah-Hartman *baud = simple_strtoul(s, NULL, 10); 2145ab4382d2SGreg Kroah-Hartman while (*s >= '0' && *s <= '9') 2146ab4382d2SGreg Kroah-Hartman s++; 2147ab4382d2SGreg Kroah-Hartman if (*s) 2148ab4382d2SGreg Kroah-Hartman *parity = *s++; 2149ab4382d2SGreg Kroah-Hartman if (*s) 2150ab4382d2SGreg Kroah-Hartman *bits = *s++ - '0'; 2151ab4382d2SGreg Kroah-Hartman if (*s) 2152ab4382d2SGreg Kroah-Hartman *flow = *s; 2153ab4382d2SGreg Kroah-Hartman } 2154ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_parse_options); 2155ab4382d2SGreg Kroah-Hartman 2156ab4382d2SGreg Kroah-Hartman /** 2157ab4382d2SGreg Kroah-Hartman * uart_set_options - setup the serial console parameters 2158ab4382d2SGreg Kroah-Hartman * @port: pointer to the serial ports uart_port structure 2159ab4382d2SGreg Kroah-Hartman * @co: console pointer 2160ab4382d2SGreg Kroah-Hartman * @baud: baud rate 2161ab4382d2SGreg Kroah-Hartman * @parity: parity character - 'n' (none), 'o' (odd), 'e' (even) 2162ab4382d2SGreg Kroah-Hartman * @bits: number of data bits 2163ab4382d2SGreg Kroah-Hartman * @flow: flow control character - 'r' (rts) 2164ab4382d2SGreg Kroah-Hartman */ 2165ab4382d2SGreg Kroah-Hartman int 2166ab4382d2SGreg Kroah-Hartman uart_set_options(struct uart_port *port, struct console *co, 2167ab4382d2SGreg Kroah-Hartman int baud, int parity, int bits, int flow) 2168ab4382d2SGreg Kroah-Hartman { 2169ab4382d2SGreg Kroah-Hartman struct ktermios termios; 2170ab4382d2SGreg Kroah-Hartman static struct ktermios dummy; 2171ab4382d2SGreg Kroah-Hartman 2172e0830dbfSJohan Hovold /* 2173e0830dbfSJohan Hovold * Ensure that the serial-console lock is initialised early. 2174e0830dbfSJohan Hovold * 2175e0830dbfSJohan Hovold * Note that the console-enabled check is needed because of kgdboc, 2176e0830dbfSJohan Hovold * which can end up calling uart_set_options() for an already enabled 2177e0830dbfSJohan Hovold * console via tty_find_polling_driver() and uart_poll_init(). 2178e0830dbfSJohan Hovold */ 2179e0830dbfSJohan Hovold if (!uart_console_enabled(port) && !port->console_reinit) 2180d2403cadSAndy Shevchenko uart_port_spin_lock_init(port); 2181ab4382d2SGreg Kroah-Hartman 2182ab4382d2SGreg Kroah-Hartman memset(&termios, 0, sizeof(struct ktermios)); 2183ab4382d2SGreg Kroah-Hartman 2184ba47f97aSJeffy Chen termios.c_cflag |= CREAD | HUPCL | CLOCAL; 2185ba47f97aSJeffy Chen tty_termios_encode_baud_rate(&termios, baud, baud); 2186ab4382d2SGreg Kroah-Hartman 2187ab4382d2SGreg Kroah-Hartman if (bits == 7) 2188ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CS7; 2189ab4382d2SGreg Kroah-Hartman else 2190ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CS8; 2191ab4382d2SGreg Kroah-Hartman 2192ab4382d2SGreg Kroah-Hartman switch (parity) { 2193ab4382d2SGreg Kroah-Hartman case 'o': case 'O': 2194ab4382d2SGreg Kroah-Hartman termios.c_cflag |= PARODD; 2195df561f66SGustavo A. R. Silva fallthrough; 2196ab4382d2SGreg Kroah-Hartman case 'e': case 'E': 2197ab4382d2SGreg Kroah-Hartman termios.c_cflag |= PARENB; 2198ab4382d2SGreg Kroah-Hartman break; 2199ab4382d2SGreg Kroah-Hartman } 2200ab4382d2SGreg Kroah-Hartman 2201ab4382d2SGreg Kroah-Hartman if (flow == 'r') 2202ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CRTSCTS; 2203ab4382d2SGreg Kroah-Hartman 2204ab4382d2SGreg Kroah-Hartman /* 2205ab4382d2SGreg Kroah-Hartman * some uarts on other side don't support no flow control. 2206ab4382d2SGreg Kroah-Hartman * So we set * DTR in host uart to make them happy 2207ab4382d2SGreg Kroah-Hartman */ 2208ab4382d2SGreg Kroah-Hartman port->mctrl |= TIOCM_DTR; 2209ab4382d2SGreg Kroah-Hartman 2210ab4382d2SGreg Kroah-Hartman port->ops->set_termios(port, &termios, &dummy); 2211ab4382d2SGreg Kroah-Hartman /* 2212ab4382d2SGreg Kroah-Hartman * Allow the setting of the UART parameters with a NULL console 2213ab4382d2SGreg Kroah-Hartman * too: 2214ab4382d2SGreg Kroah-Hartman */ 2215027b5717SPali Rohár if (co) { 2216ab4382d2SGreg Kroah-Hartman co->cflag = termios.c_cflag; 2217027b5717SPali Rohár co->ispeed = termios.c_ispeed; 2218027b5717SPali Rohár co->ospeed = termios.c_ospeed; 2219027b5717SPali Rohár } 2220ab4382d2SGreg Kroah-Hartman 2221ab4382d2SGreg Kroah-Hartman return 0; 2222ab4382d2SGreg Kroah-Hartman } 2223ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_set_options); 2224ab4382d2SGreg Kroah-Hartman #endif /* CONFIG_SERIAL_CORE_CONSOLE */ 2225ab4382d2SGreg Kroah-Hartman 2226cf75525fSJiri Slaby /** 2227cf75525fSJiri Slaby * uart_change_pm - set power state of the port 2228cf75525fSJiri Slaby * 2229cf75525fSJiri Slaby * @state: port descriptor 2230cf75525fSJiri Slaby * @pm_state: new state 2231cf75525fSJiri Slaby * 2232cf75525fSJiri Slaby * Locking: port->mutex has to be held 2233cf75525fSJiri Slaby */ 22346f538fe3SLinus Walleij static void uart_change_pm(struct uart_state *state, 22356f538fe3SLinus Walleij enum uart_pm_state pm_state) 2236ab4382d2SGreg Kroah-Hartman { 22374047b371SPeter Hurley struct uart_port *port = uart_port_check(state); 2238ab4382d2SGreg Kroah-Hartman 2239ab4382d2SGreg Kroah-Hartman if (state->pm_state != pm_state) { 22404047b371SPeter Hurley if (port && port->ops->pm) 2241ab4382d2SGreg Kroah-Hartman port->ops->pm(port, pm_state, state->pm_state); 2242ab4382d2SGreg Kroah-Hartman state->pm_state = pm_state; 2243ab4382d2SGreg Kroah-Hartman } 2244ab4382d2SGreg Kroah-Hartman } 2245ab4382d2SGreg Kroah-Hartman 2246ab4382d2SGreg Kroah-Hartman struct uart_match { 2247ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2248ab4382d2SGreg Kroah-Hartman struct uart_driver *driver; 2249ab4382d2SGreg Kroah-Hartman }; 2250ab4382d2SGreg Kroah-Hartman 2251ab4382d2SGreg Kroah-Hartman static int serial_match_port(struct device *dev, void *data) 2252ab4382d2SGreg Kroah-Hartman { 2253ab4382d2SGreg Kroah-Hartman struct uart_match *match = data; 2254ab4382d2SGreg Kroah-Hartman struct tty_driver *tty_drv = match->driver->tty_driver; 2255ab4382d2SGreg Kroah-Hartman dev_t devt = MKDEV(tty_drv->major, tty_drv->minor_start) + 2256ab4382d2SGreg Kroah-Hartman match->port->line; 2257ab4382d2SGreg Kroah-Hartman 2258ab4382d2SGreg Kroah-Hartman return dev->devt == devt; /* Actually, only one tty per port */ 2259ab4382d2SGreg Kroah-Hartman } 2260ab4382d2SGreg Kroah-Hartman 2261ab4382d2SGreg Kroah-Hartman int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport) 2262ab4382d2SGreg Kroah-Hartman { 2263ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 2264ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2265ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 2266ab4382d2SGreg Kroah-Hartman struct uart_match match = {uport, drv}; 2267ab4382d2SGreg Kroah-Hartman 2268ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2269ab4382d2SGreg Kroah-Hartman 2270ab4382d2SGreg Kroah-Hartman tty_dev = device_find_child(uport->dev, &match, serial_match_port); 227188e2582eSLucas Stach if (tty_dev && device_may_wakeup(tty_dev)) { 2272aef3ad10SAndy Shevchenko enable_irq_wake(uport->irq); 2273ab4382d2SGreg Kroah-Hartman put_device(tty_dev); 2274ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2275ab4382d2SGreg Kroah-Hartman return 0; 2276ab4382d2SGreg Kroah-Hartman } 22775a65dcc0SFederico Vaga put_device(tty_dev); 22785a65dcc0SFederico Vaga 2279c9d2325cSVijaya Krishna Nivarthi /* 2280c9d2325cSVijaya Krishna Nivarthi * Nothing to do if the console is not suspending 2281c9d2325cSVijaya Krishna Nivarthi * except stop_rx to prevent any asynchronous data 2282cfab87c2SVijaya Krishna Nivarthi * over RX line. However ensure that we will be 2283cfab87c2SVijaya Krishna Nivarthi * able to Re-start_rx later. 2284c9d2325cSVijaya Krishna Nivarthi */ 2285c9d2325cSVijaya Krishna Nivarthi if (!console_suspend_enabled && uart_console(uport)) { 2286cfab87c2SVijaya Krishna Nivarthi if (uport->ops->start_rx) 2287c9d2325cSVijaya Krishna Nivarthi uport->ops->stop_rx(uport); 2288b164c972SPeter Hurley goto unlock; 2289c9d2325cSVijaya Krishna Nivarthi } 2290b164c972SPeter Hurley 2291ab4382d2SGreg Kroah-Hartman uport->suspended = 1; 2292ab4382d2SGreg Kroah-Hartman 2293d41861caSPeter Hurley if (tty_port_initialized(port)) { 2294ab4382d2SGreg Kroah-Hartman const struct uart_ops *ops = uport->ops; 2295ab4382d2SGreg Kroah-Hartman int tries; 229618c9d4a3SAl Cooper unsigned int mctrl; 2297ab4382d2SGreg Kroah-Hartman 229880f02d54SPeter Hurley tty_port_set_suspended(port, 1); 2299d41861caSPeter Hurley tty_port_set_initialized(port, 0); 2300ab4382d2SGreg Kroah-Hartman 2301ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 2302ab4382d2SGreg Kroah-Hartman ops->stop_tx(uport); 2303ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, 0); 230418c9d4a3SAl Cooper /* save mctrl so it can be restored on resume */ 230518c9d4a3SAl Cooper mctrl = uport->mctrl; 230618c9d4a3SAl Cooper uport->mctrl = 0; 2307ab4382d2SGreg Kroah-Hartman ops->stop_rx(uport); 2308ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2309ab4382d2SGreg Kroah-Hartman 2310ab4382d2SGreg Kroah-Hartman /* 2311ab4382d2SGreg Kroah-Hartman * Wait for the transmitter to empty. 2312ab4382d2SGreg Kroah-Hartman */ 2313ab4382d2SGreg Kroah-Hartman for (tries = 3; !ops->tx_empty(uport) && tries; tries--) 2314ab4382d2SGreg Kroah-Hartman msleep(10); 2315ab4382d2SGreg Kroah-Hartman if (!tries) 2316cade3580SAndy Shevchenko dev_err(uport->dev, "%s: Unable to drain transmitter\n", 2317cade3580SAndy Shevchenko uport->name); 2318ab4382d2SGreg Kroah-Hartman 2319ab4382d2SGreg Kroah-Hartman ops->shutdown(uport); 232018c9d4a3SAl Cooper uport->mctrl = mctrl; 2321ab4382d2SGreg Kroah-Hartman } 2322ab4382d2SGreg Kroah-Hartman 2323ab4382d2SGreg Kroah-Hartman /* 2324ab4382d2SGreg Kroah-Hartman * Disable the console device before suspending. 2325ab4382d2SGreg Kroah-Hartman */ 2326b164c972SPeter Hurley if (uart_console(uport)) 2327ab4382d2SGreg Kroah-Hartman console_stop(uport->cons); 2328ab4382d2SGreg Kroah-Hartman 23296f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_OFF); 2330b164c972SPeter Hurley unlock: 2331ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2332ab4382d2SGreg Kroah-Hartman 2333ab4382d2SGreg Kroah-Hartman return 0; 2334ab4382d2SGreg Kroah-Hartman } 233515dc475bSJiri Slaby EXPORT_SYMBOL(uart_suspend_port); 2336ab4382d2SGreg Kroah-Hartman 2337ab4382d2SGreg Kroah-Hartman int uart_resume_port(struct uart_driver *drv, struct uart_port *uport) 2338ab4382d2SGreg Kroah-Hartman { 2339ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 2340ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2341ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 2342ab4382d2SGreg Kroah-Hartman struct uart_match match = {uport, drv}; 2343ab4382d2SGreg Kroah-Hartman struct ktermios termios; 2344ab4382d2SGreg Kroah-Hartman 2345ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2346ab4382d2SGreg Kroah-Hartman 2347ab4382d2SGreg Kroah-Hartman tty_dev = device_find_child(uport->dev, &match, serial_match_port); 2348ab4382d2SGreg Kroah-Hartman if (!uport->suspended && device_may_wakeup(tty_dev)) { 2349aef3ad10SAndy Shevchenko if (irqd_is_wakeup_set(irq_get_irq_data((uport->irq)))) 2350ab4382d2SGreg Kroah-Hartman disable_irq_wake(uport->irq); 23515a65dcc0SFederico Vaga put_device(tty_dev); 2352ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2353ab4382d2SGreg Kroah-Hartman return 0; 2354ab4382d2SGreg Kroah-Hartman } 23555a65dcc0SFederico Vaga put_device(tty_dev); 2356ab4382d2SGreg Kroah-Hartman uport->suspended = 0; 2357ab4382d2SGreg Kroah-Hartman 2358ab4382d2SGreg Kroah-Hartman /* 2359ab4382d2SGreg Kroah-Hartman * Re-enable the console device after suspending. 2360ab4382d2SGreg Kroah-Hartman */ 23615933a161SYin Kangkai if (uart_console(uport)) { 2362ab4382d2SGreg Kroah-Hartman /* 2363ab4382d2SGreg Kroah-Hartman * First try to use the console cflag setting. 2364ab4382d2SGreg Kroah-Hartman */ 2365ab4382d2SGreg Kroah-Hartman memset(&termios, 0, sizeof(struct ktermios)); 2366ab4382d2SGreg Kroah-Hartman termios.c_cflag = uport->cons->cflag; 2367027b5717SPali Rohár termios.c_ispeed = uport->cons->ispeed; 2368027b5717SPali Rohár termios.c_ospeed = uport->cons->ospeed; 2369ab4382d2SGreg Kroah-Hartman 2370ab4382d2SGreg Kroah-Hartman /* 2371ab4382d2SGreg Kroah-Hartman * If that's unset, use the tty termios setting. 2372ab4382d2SGreg Kroah-Hartman */ 2373adc8d746SAlan Cox if (port->tty && termios.c_cflag == 0) 2374adc8d746SAlan Cox termios = port->tty->termios; 2375ab4382d2SGreg Kroah-Hartman 237694abc56fSNing Jiang if (console_suspend_enabled) 23776f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2378ab4382d2SGreg Kroah-Hartman uport->ops->set_termios(uport, &termios, NULL); 2379cfab87c2SVijaya Krishna Nivarthi if (!console_suspend_enabled && uport->ops->start_rx) 2380cfab87c2SVijaya Krishna Nivarthi uport->ops->start_rx(uport); 23815933a161SYin Kangkai if (console_suspend_enabled) 2382ab4382d2SGreg Kroah-Hartman console_start(uport->cons); 2383ab4382d2SGreg Kroah-Hartman } 2384ab4382d2SGreg Kroah-Hartman 238580f02d54SPeter Hurley if (tty_port_suspended(port)) { 2386ab4382d2SGreg Kroah-Hartman const struct uart_ops *ops = uport->ops; 2387ab4382d2SGreg Kroah-Hartman int ret; 2388ab4382d2SGreg Kroah-Hartman 23896f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2390ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 2391ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, 0); 2392ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2393ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) { 2394ab4382d2SGreg Kroah-Hartman /* Protected by port mutex for now */ 2395ab4382d2SGreg Kroah-Hartman struct tty_struct *tty = port->tty; 23964ed71addSTamseel Shams 2397ab4382d2SGreg Kroah-Hartman ret = ops->startup(uport); 2398ab4382d2SGreg Kroah-Hartman if (ret == 0) { 2399ab4382d2SGreg Kroah-Hartman if (tty) 2400ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 2401ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 2402ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, uport->mctrl); 2403ab4382d2SGreg Kroah-Hartman ops->start_tx(uport); 2404ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2405d41861caSPeter Hurley tty_port_set_initialized(port, 1); 2406ab4382d2SGreg Kroah-Hartman } else { 2407ab4382d2SGreg Kroah-Hartman /* 2408ab4382d2SGreg Kroah-Hartman * Failed to resume - maybe hardware went away? 2409ab4382d2SGreg Kroah-Hartman * Clear the "initialized" flag so we won't try 2410ab4382d2SGreg Kroah-Hartman * to call the low level drivers shutdown method. 2411ab4382d2SGreg Kroah-Hartman */ 2412ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 2413ab4382d2SGreg Kroah-Hartman } 2414ab4382d2SGreg Kroah-Hartman } 2415ab4382d2SGreg Kroah-Hartman 241680f02d54SPeter Hurley tty_port_set_suspended(port, 0); 2417ab4382d2SGreg Kroah-Hartman } 2418ab4382d2SGreg Kroah-Hartman 2419ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2420ab4382d2SGreg Kroah-Hartman 2421ab4382d2SGreg Kroah-Hartman return 0; 2422ab4382d2SGreg Kroah-Hartman } 242315dc475bSJiri Slaby EXPORT_SYMBOL(uart_resume_port); 2424ab4382d2SGreg Kroah-Hartman 2425ab4382d2SGreg Kroah-Hartman static inline void 2426ab4382d2SGreg Kroah-Hartman uart_report_port(struct uart_driver *drv, struct uart_port *port) 2427ab4382d2SGreg Kroah-Hartman { 2428ab4382d2SGreg Kroah-Hartman char address[64]; 2429ab4382d2SGreg Kroah-Hartman 2430ab4382d2SGreg Kroah-Hartman switch (port->iotype) { 2431ab4382d2SGreg Kroah-Hartman case UPIO_PORT: 2432ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), "I/O 0x%lx", port->iobase); 2433ab4382d2SGreg Kroah-Hartman break; 2434ab4382d2SGreg Kroah-Hartman case UPIO_HUB6: 2435ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), 2436ab4382d2SGreg Kroah-Hartman "I/O 0x%lx offset 0x%x", port->iobase, port->hub6); 2437ab4382d2SGreg Kroah-Hartman break; 2438ab4382d2SGreg Kroah-Hartman case UPIO_MEM: 2439bd94c407SMasahiro Yamada case UPIO_MEM16: 2440ab4382d2SGreg Kroah-Hartman case UPIO_MEM32: 24413ffb1a81SKevin Cernekee case UPIO_MEM32BE: 2442ab4382d2SGreg Kroah-Hartman case UPIO_AU: 2443ab4382d2SGreg Kroah-Hartman case UPIO_TSI: 2444ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), 2445ab4382d2SGreg Kroah-Hartman "MMIO 0x%llx", (unsigned long long)port->mapbase); 2446ab4382d2SGreg Kroah-Hartman break; 2447ab4382d2SGreg Kroah-Hartman default: 2448ab4382d2SGreg Kroah-Hartman strlcpy(address, "*unknown*", sizeof(address)); 2449ab4382d2SGreg Kroah-Hartman break; 2450ab4382d2SGreg Kroah-Hartman } 2451ab4382d2SGreg Kroah-Hartman 2452cade3580SAndy Shevchenko pr_info("%s%s%s at %s (irq = %d, base_baud = %d) is a %s\n", 245368ed7e1cSJames Bottomley port->dev ? dev_name(port->dev) : "", 245468ed7e1cSJames Bottomley port->dev ? ": " : "", 2455cade3580SAndy Shevchenko port->name, 24567d12b976SKees Cook address, port->irq, port->uartclk / 16, uart_type(port)); 2457e7b91932SMaciej W. Rozycki 2458e7b91932SMaciej W. Rozycki /* The magic multiplier feature is a bit obscure, so report it too. */ 2459e7b91932SMaciej W. Rozycki if (port->flags & UPF_MAGIC_MULTIPLIER) 2460e7b91932SMaciej W. Rozycki pr_info("%s%s%s extra baud rates supported: %d, %d", 2461e7b91932SMaciej W. Rozycki port->dev ? dev_name(port->dev) : "", 2462e7b91932SMaciej W. Rozycki port->dev ? ": " : "", 2463e7b91932SMaciej W. Rozycki port->name, 2464e7b91932SMaciej W. Rozycki port->uartclk / 8, port->uartclk / 4); 2465ab4382d2SGreg Kroah-Hartman } 2466ab4382d2SGreg Kroah-Hartman 2467ab4382d2SGreg Kroah-Hartman static void 2468ab4382d2SGreg Kroah-Hartman uart_configure_port(struct uart_driver *drv, struct uart_state *state, 2469ab4382d2SGreg Kroah-Hartman struct uart_port *port) 2470ab4382d2SGreg Kroah-Hartman { 2471ab4382d2SGreg Kroah-Hartman unsigned int flags; 2472ab4382d2SGreg Kroah-Hartman 2473ab4382d2SGreg Kroah-Hartman /* 2474ab4382d2SGreg Kroah-Hartman * If there isn't a port here, don't do anything further. 2475ab4382d2SGreg Kroah-Hartman */ 2476ab4382d2SGreg Kroah-Hartman if (!port->iobase && !port->mapbase && !port->membase) 2477ab4382d2SGreg Kroah-Hartman return; 2478ab4382d2SGreg Kroah-Hartman 2479ab4382d2SGreg Kroah-Hartman /* 2480ab4382d2SGreg Kroah-Hartman * Now do the auto configuration stuff. Note that config_port 2481ab4382d2SGreg Kroah-Hartman * is expected to claim the resources and map the port for us. 2482ab4382d2SGreg Kroah-Hartman */ 2483ab4382d2SGreg Kroah-Hartman flags = 0; 2484ab4382d2SGreg Kroah-Hartman if (port->flags & UPF_AUTO_IRQ) 2485ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_IRQ; 2486ab4382d2SGreg Kroah-Hartman if (port->flags & UPF_BOOT_AUTOCONF) { 2487ab4382d2SGreg Kroah-Hartman if (!(port->flags & UPF_FIXED_TYPE)) { 2488ab4382d2SGreg Kroah-Hartman port->type = PORT_UNKNOWN; 2489ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_TYPE; 2490ab4382d2SGreg Kroah-Hartman } 2491ab4382d2SGreg Kroah-Hartman port->ops->config_port(port, flags); 2492ab4382d2SGreg Kroah-Hartman } 2493ab4382d2SGreg Kroah-Hartman 2494ab4382d2SGreg Kroah-Hartman if (port->type != PORT_UNKNOWN) { 2495ab4382d2SGreg Kroah-Hartman unsigned long flags; 2496ab4382d2SGreg Kroah-Hartman 2497ab4382d2SGreg Kroah-Hartman uart_report_port(drv, port); 2498ab4382d2SGreg Kroah-Hartman 2499ab4382d2SGreg Kroah-Hartman /* Power up port for set_mctrl() */ 25006f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2501ab4382d2SGreg Kroah-Hartman 2502ab4382d2SGreg Kroah-Hartman /* 2503ab4382d2SGreg Kroah-Hartman * Ensure that the modem control lines are de-activated. 2504ab4382d2SGreg Kroah-Hartman * keep the DTR setting that is set in uart_set_options() 2505ab4382d2SGreg Kroah-Hartman * We probably don't need a spinlock around this, but 2506ab4382d2SGreg Kroah-Hartman */ 2507ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 250893a770b7SLukas Wunner port->mctrl &= TIOCM_DTR; 25092dd8a74fSLukas Wunner if (port->rs485.flags & SER_RS485_ENABLED && 25102dd8a74fSLukas Wunner !(port->rs485.flags & SER_RS485_RTS_AFTER_SEND)) 25112dd8a74fSLukas Wunner port->mctrl |= TIOCM_RTS; 251293a770b7SLukas Wunner port->ops->set_mctrl(port, port->mctrl); 2513ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 2514ab4382d2SGreg Kroah-Hartman 2515ab4382d2SGreg Kroah-Hartman /* 2516ab4382d2SGreg Kroah-Hartman * If this driver supports console, and it hasn't been 2517ab4382d2SGreg Kroah-Hartman * successfully registered yet, try to re-register it. 2518ab4382d2SGreg Kroah-Hartman * It may be that the port was not available. 2519ab4382d2SGreg Kroah-Hartman */ 2520ab4382d2SGreg Kroah-Hartman if (port->cons && !(port->cons->flags & CON_ENABLED)) 2521ab4382d2SGreg Kroah-Hartman register_console(port->cons); 2522ab4382d2SGreg Kroah-Hartman 2523ab4382d2SGreg Kroah-Hartman /* 2524ab4382d2SGreg Kroah-Hartman * Power down all ports by default, except the 2525ab4382d2SGreg Kroah-Hartman * console if we have one. 2526ab4382d2SGreg Kroah-Hartman */ 2527ab4382d2SGreg Kroah-Hartman if (!uart_console(port)) 25286f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_OFF); 2529ab4382d2SGreg Kroah-Hartman } 2530ab4382d2SGreg Kroah-Hartman } 2531ab4382d2SGreg Kroah-Hartman 2532ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 2533ab4382d2SGreg Kroah-Hartman 2534ab4382d2SGreg Kroah-Hartman static int uart_poll_init(struct tty_driver *driver, int line, char *options) 2535ab4382d2SGreg Kroah-Hartman { 2536ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2537ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 253849c02304SPeter Hurley struct tty_port *tport; 2539ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2540ab4382d2SGreg Kroah-Hartman int baud = 9600; 2541ab4382d2SGreg Kroah-Hartman int bits = 8; 2542ab4382d2SGreg Kroah-Hartman int parity = 'n'; 2543ab4382d2SGreg Kroah-Hartman int flow = 'n'; 254449c02304SPeter Hurley int ret = 0; 2545ab4382d2SGreg Kroah-Hartman 254649c02304SPeter Hurley tport = &state->port; 254749c02304SPeter Hurley mutex_lock(&tport->mutex); 254849c02304SPeter Hurley 25494047b371SPeter Hurley port = uart_port_check(state); 25504047b371SPeter Hurley if (!port || !(port->ops->poll_get_char && port->ops->poll_put_char)) { 255149c02304SPeter Hurley ret = -1; 255249c02304SPeter Hurley goto out; 255349c02304SPeter Hurley } 2554ab4382d2SGreg Kroah-Hartman 2555c7f3e708SAnton Vorontsov if (port->ops->poll_init) { 2556c7f3e708SAnton Vorontsov /* 2557d41861caSPeter Hurley * We don't set initialized as we only initialized the hw, 2558d41861caSPeter Hurley * e.g. state->xmit is still uninitialized. 2559c7f3e708SAnton Vorontsov */ 2560d41861caSPeter Hurley if (!tty_port_initialized(tport)) 2561c7f3e708SAnton Vorontsov ret = port->ops->poll_init(port); 2562c7f3e708SAnton Vorontsov } 2563c7f3e708SAnton Vorontsov 256449c02304SPeter Hurley if (!ret && options) { 2565ab4382d2SGreg Kroah-Hartman uart_parse_options(options, &baud, &parity, &bits, &flow); 256649c02304SPeter Hurley ret = uart_set_options(port, NULL, baud, parity, bits, flow); 2567ab4382d2SGreg Kroah-Hartman } 256849c02304SPeter Hurley out: 256949c02304SPeter Hurley mutex_unlock(&tport->mutex); 257049c02304SPeter Hurley return ret; 2571ab4382d2SGreg Kroah-Hartman } 2572ab4382d2SGreg Kroah-Hartman 2573ab4382d2SGreg Kroah-Hartman static int uart_poll_get_char(struct tty_driver *driver, int line) 2574ab4382d2SGreg Kroah-Hartman { 2575ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2576ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2577ab4382d2SGreg Kroah-Hartman struct uart_port *port; 25789ed19428SPeter Hurley int ret = -1; 2579ab4382d2SGreg Kroah-Hartman 25809ed19428SPeter Hurley port = uart_port_ref(state); 2581ef510beaSAndy Shevchenko if (port) { 25829ed19428SPeter Hurley ret = port->ops->poll_get_char(port); 25839ed19428SPeter Hurley uart_port_deref(port); 25849ed19428SPeter Hurley } 258522077b09SJiri Slaby 25869ed19428SPeter Hurley return ret; 2587ab4382d2SGreg Kroah-Hartman } 2588ab4382d2SGreg Kroah-Hartman 2589ab4382d2SGreg Kroah-Hartman static void uart_poll_put_char(struct tty_driver *driver, int line, char ch) 2590ab4382d2SGreg Kroah-Hartman { 2591ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2592ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2593ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2594ab4382d2SGreg Kroah-Hartman 25959ed19428SPeter Hurley port = uart_port_ref(state); 25969ed19428SPeter Hurley if (!port) 25979ed19428SPeter Hurley return; 2598c7d44a02SDoug Anderson 2599c7d44a02SDoug Anderson if (ch == '\n') 2600c7d44a02SDoug Anderson port->ops->poll_put_char(port, '\r'); 2601ab4382d2SGreg Kroah-Hartman port->ops->poll_put_char(port, ch); 26029ed19428SPeter Hurley uart_port_deref(port); 2603ab4382d2SGreg Kroah-Hartman } 2604ab4382d2SGreg Kroah-Hartman #endif 2605ab4382d2SGreg Kroah-Hartman 2606ab4382d2SGreg Kroah-Hartman static const struct tty_operations uart_ops = { 26074cdd17baSJiri Slaby .install = uart_install, 2608ab4382d2SGreg Kroah-Hartman .open = uart_open, 2609ab4382d2SGreg Kroah-Hartman .close = uart_close, 2610ab4382d2SGreg Kroah-Hartman .write = uart_write, 2611ab4382d2SGreg Kroah-Hartman .put_char = uart_put_char, 2612ab4382d2SGreg Kroah-Hartman .flush_chars = uart_flush_chars, 2613ab4382d2SGreg Kroah-Hartman .write_room = uart_write_room, 2614ab4382d2SGreg Kroah-Hartman .chars_in_buffer= uart_chars_in_buffer, 2615ab4382d2SGreg Kroah-Hartman .flush_buffer = uart_flush_buffer, 2616ab4382d2SGreg Kroah-Hartman .ioctl = uart_ioctl, 2617ab4382d2SGreg Kroah-Hartman .throttle = uart_throttle, 2618ab4382d2SGreg Kroah-Hartman .unthrottle = uart_unthrottle, 2619ab4382d2SGreg Kroah-Hartman .send_xchar = uart_send_xchar, 2620ab4382d2SGreg Kroah-Hartman .set_termios = uart_set_termios, 2621ab4382d2SGreg Kroah-Hartman .set_ldisc = uart_set_ldisc, 2622ab4382d2SGreg Kroah-Hartman .stop = uart_stop, 2623ab4382d2SGreg Kroah-Hartman .start = uart_start, 2624ab4382d2SGreg Kroah-Hartman .hangup = uart_hangup, 2625ab4382d2SGreg Kroah-Hartman .break_ctl = uart_break_ctl, 2626ab4382d2SGreg Kroah-Hartman .wait_until_sent= uart_wait_until_sent, 2627ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_PROC_FS 26288a8dcabfSChristoph Hellwig .proc_show = uart_proc_show, 2629ab4382d2SGreg Kroah-Hartman #endif 2630ab4382d2SGreg Kroah-Hartman .tiocmget = uart_tiocmget, 2631ab4382d2SGreg Kroah-Hartman .tiocmset = uart_tiocmset, 26325099d234SAl Viro .set_serial = uart_set_info_user, 26335099d234SAl Viro .get_serial = uart_get_info_user, 2634ab4382d2SGreg Kroah-Hartman .get_icount = uart_get_icount, 2635ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 2636ab4382d2SGreg Kroah-Hartman .poll_init = uart_poll_init, 2637ab4382d2SGreg Kroah-Hartman .poll_get_char = uart_poll_get_char, 2638ab4382d2SGreg Kroah-Hartman .poll_put_char = uart_poll_put_char, 2639ab4382d2SGreg Kroah-Hartman #endif 2640ab4382d2SGreg Kroah-Hartman }; 2641ab4382d2SGreg Kroah-Hartman 2642ab4382d2SGreg Kroah-Hartman static const struct tty_port_operations uart_port_ops = { 2643ab4382d2SGreg Kroah-Hartman .carrier_raised = uart_carrier_raised, 2644ab4382d2SGreg Kroah-Hartman .dtr_rts = uart_dtr_rts, 2645b3b57646SRob Herring .activate = uart_port_activate, 2646761ed4a9SRob Herring .shutdown = uart_tty_port_shutdown, 2647ab4382d2SGreg Kroah-Hartman }; 2648ab4382d2SGreg Kroah-Hartman 2649ab4382d2SGreg Kroah-Hartman /** 2650ab4382d2SGreg Kroah-Hartman * uart_register_driver - register a driver with the uart core layer 2651ab4382d2SGreg Kroah-Hartman * @drv: low level driver structure 2652ab4382d2SGreg Kroah-Hartman * 2653ab4382d2SGreg Kroah-Hartman * Register a uart driver with the core driver. We in turn register 2654ab4382d2SGreg Kroah-Hartman * with the tty layer, and initialise the core driver per-port state. 2655ab4382d2SGreg Kroah-Hartman * 2656ab4382d2SGreg Kroah-Hartman * We have a proc file in /proc/tty/driver which is named after the 2657ab4382d2SGreg Kroah-Hartman * normal driver. 2658ab4382d2SGreg Kroah-Hartman * 2659ab4382d2SGreg Kroah-Hartman * drv->port should be NULL, and the per-port structures should be 2660ab4382d2SGreg Kroah-Hartman * registered using uart_add_one_port after this call has succeeded. 2661ab4382d2SGreg Kroah-Hartman */ 2662ab4382d2SGreg Kroah-Hartman int uart_register_driver(struct uart_driver *drv) 2663ab4382d2SGreg Kroah-Hartman { 2664ab4382d2SGreg Kroah-Hartman struct tty_driver *normal; 2665050dfc09SSergey Organov int i, retval = -ENOMEM; 2666ab4382d2SGreg Kroah-Hartman 2667ab4382d2SGreg Kroah-Hartman BUG_ON(drv->state); 2668ab4382d2SGreg Kroah-Hartman 2669ab4382d2SGreg Kroah-Hartman /* 2670ab4382d2SGreg Kroah-Hartman * Maybe we should be using a slab cache for this, especially if 2671ab4382d2SGreg Kroah-Hartman * we have a large number of ports to handle. 2672ab4382d2SGreg Kroah-Hartman */ 26736396bb22SKees Cook drv->state = kcalloc(drv->nr, sizeof(struct uart_state), GFP_KERNEL); 2674ab4382d2SGreg Kroah-Hartman if (!drv->state) 2675ab4382d2SGreg Kroah-Hartman goto out; 2676ab4382d2SGreg Kroah-Hartman 267739b7b42bSJiri Slaby normal = tty_alloc_driver(drv->nr, TTY_DRIVER_REAL_RAW | 267839b7b42bSJiri Slaby TTY_DRIVER_DYNAMIC_DEV); 267939b7b42bSJiri Slaby if (IS_ERR(normal)) { 268039b7b42bSJiri Slaby retval = PTR_ERR(normal); 2681ab4382d2SGreg Kroah-Hartman goto out_kfree; 268239b7b42bSJiri Slaby } 2683ab4382d2SGreg Kroah-Hartman 2684ab4382d2SGreg Kroah-Hartman drv->tty_driver = normal; 2685ab4382d2SGreg Kroah-Hartman 2686ab4382d2SGreg Kroah-Hartman normal->driver_name = drv->driver_name; 2687ab4382d2SGreg Kroah-Hartman normal->name = drv->dev_name; 2688ab4382d2SGreg Kroah-Hartman normal->major = drv->major; 2689ab4382d2SGreg Kroah-Hartman normal->minor_start = drv->minor; 2690ab4382d2SGreg Kroah-Hartman normal->type = TTY_DRIVER_TYPE_SERIAL; 2691ab4382d2SGreg Kroah-Hartman normal->subtype = SERIAL_TYPE_NORMAL; 2692ab4382d2SGreg Kroah-Hartman normal->init_termios = tty_std_termios; 2693ab4382d2SGreg Kroah-Hartman normal->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; 2694ab4382d2SGreg Kroah-Hartman normal->init_termios.c_ispeed = normal->init_termios.c_ospeed = 9600; 2695ab4382d2SGreg Kroah-Hartman normal->driver_state = drv; 2696ab4382d2SGreg Kroah-Hartman tty_set_operations(normal, &uart_ops); 2697ab4382d2SGreg Kroah-Hartman 2698ab4382d2SGreg Kroah-Hartman /* 2699ab4382d2SGreg Kroah-Hartman * Initialise the UART state(s). 2700ab4382d2SGreg Kroah-Hartman */ 2701ab4382d2SGreg Kroah-Hartman for (i = 0; i < drv->nr; i++) { 2702ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + i; 2703ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2704ab4382d2SGreg Kroah-Hartman 2705ab4382d2SGreg Kroah-Hartman tty_port_init(port); 2706ab4382d2SGreg Kroah-Hartman port->ops = &uart_port_ops; 2707ab4382d2SGreg Kroah-Hartman } 2708ab4382d2SGreg Kroah-Hartman 2709ab4382d2SGreg Kroah-Hartman retval = tty_register_driver(normal); 2710ab4382d2SGreg Kroah-Hartman if (retval >= 0) 2711ab4382d2SGreg Kroah-Hartman return retval; 2712ab4382d2SGreg Kroah-Hartman 2713191c5f10SJiri Slaby for (i = 0; i < drv->nr; i++) 2714191c5f10SJiri Slaby tty_port_destroy(&drv->state[i].port); 27159f90a4ddSJiri Slaby tty_driver_kref_put(normal); 2716ab4382d2SGreg Kroah-Hartman out_kfree: 2717ab4382d2SGreg Kroah-Hartman kfree(drv->state); 2718ab4382d2SGreg Kroah-Hartman out: 2719050dfc09SSergey Organov return retval; 2720ab4382d2SGreg Kroah-Hartman } 272115dc475bSJiri Slaby EXPORT_SYMBOL(uart_register_driver); 2722ab4382d2SGreg Kroah-Hartman 2723ab4382d2SGreg Kroah-Hartman /** 2724ab4382d2SGreg Kroah-Hartman * uart_unregister_driver - remove a driver from the uart core layer 2725ab4382d2SGreg Kroah-Hartman * @drv: low level driver structure 2726ab4382d2SGreg Kroah-Hartman * 2727ab4382d2SGreg Kroah-Hartman * Remove all references to a driver from the core driver. The low 2728ab4382d2SGreg Kroah-Hartman * level driver must have removed all its ports via the 2729ab4382d2SGreg Kroah-Hartman * uart_remove_one_port() if it registered them with uart_add_one_port(). 2730ab4382d2SGreg Kroah-Hartman * (ie, drv->port == NULL) 2731ab4382d2SGreg Kroah-Hartman */ 2732ab4382d2SGreg Kroah-Hartman void uart_unregister_driver(struct uart_driver *drv) 2733ab4382d2SGreg Kroah-Hartman { 2734ab4382d2SGreg Kroah-Hartman struct tty_driver *p = drv->tty_driver; 2735191c5f10SJiri Slaby unsigned int i; 2736191c5f10SJiri Slaby 2737ab4382d2SGreg Kroah-Hartman tty_unregister_driver(p); 27389f90a4ddSJiri Slaby tty_driver_kref_put(p); 2739191c5f10SJiri Slaby for (i = 0; i < drv->nr; i++) 2740191c5f10SJiri Slaby tty_port_destroy(&drv->state[i].port); 2741ab4382d2SGreg Kroah-Hartman kfree(drv->state); 27421e66cdedSAlan Cox drv->state = NULL; 2743ab4382d2SGreg Kroah-Hartman drv->tty_driver = NULL; 2744ab4382d2SGreg Kroah-Hartman } 274515dc475bSJiri Slaby EXPORT_SYMBOL(uart_unregister_driver); 2746ab4382d2SGreg Kroah-Hartman 2747ab4382d2SGreg Kroah-Hartman struct tty_driver *uart_console_device(struct console *co, int *index) 2748ab4382d2SGreg Kroah-Hartman { 2749ab4382d2SGreg Kroah-Hartman struct uart_driver *p = co->data; 2750ab4382d2SGreg Kroah-Hartman *index = co->index; 2751ab4382d2SGreg Kroah-Hartman return p->tty_driver; 2752ab4382d2SGreg Kroah-Hartman } 2753488f49acSJohn Stultz EXPORT_SYMBOL_GPL(uart_console_device); 2754ab4382d2SGreg Kroah-Hartman 2755143c02c8SAndy Shevchenko static ssize_t uartclk_show(struct device *dev, 27566915c0e4STomas Hlavacek struct device_attribute *attr, char *buf) 27576915c0e4STomas Hlavacek { 2758bebe73e3SAlan Cox struct serial_struct tmp; 27596915c0e4STomas Hlavacek struct tty_port *port = dev_get_drvdata(dev); 2760b1b79916STomas Hlavacek 27619f109694SAlan Cox uart_get_info(port, &tmp); 27629cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.baud_base * 16); 27636915c0e4STomas Hlavacek } 27646915c0e4STomas Hlavacek 2765143c02c8SAndy Shevchenko static ssize_t type_show(struct device *dev, 2766373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2767373bac4cSAlan Cox { 2768373bac4cSAlan Cox struct serial_struct tmp; 2769373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2770373bac4cSAlan Cox 2771373bac4cSAlan Cox uart_get_info(port, &tmp); 27729cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.type); 2773373bac4cSAlan Cox } 2774143c02c8SAndy Shevchenko 2775143c02c8SAndy Shevchenko static ssize_t line_show(struct device *dev, 2776373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2777373bac4cSAlan Cox { 2778373bac4cSAlan Cox struct serial_struct tmp; 2779373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2780373bac4cSAlan Cox 2781373bac4cSAlan Cox uart_get_info(port, &tmp); 27829cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.line); 2783373bac4cSAlan Cox } 2784373bac4cSAlan Cox 2785143c02c8SAndy Shevchenko static ssize_t port_show(struct device *dev, 2786373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2787373bac4cSAlan Cox { 2788373bac4cSAlan Cox struct serial_struct tmp; 2789373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2790fd985e1dSAndrew Morton unsigned long ioaddr; 2791373bac4cSAlan Cox 2792373bac4cSAlan Cox uart_get_info(port, &tmp); 2793fd985e1dSAndrew Morton ioaddr = tmp.port; 2794fd985e1dSAndrew Morton if (HIGH_BITS_OFFSET) 2795fd985e1dSAndrew Morton ioaddr |= (unsigned long)tmp.port_high << HIGH_BITS_OFFSET; 27969cfbf7a6SAlex Dewar return sprintf(buf, "0x%lX\n", ioaddr); 2797373bac4cSAlan Cox } 2798373bac4cSAlan Cox 2799143c02c8SAndy Shevchenko static ssize_t irq_show(struct device *dev, 2800373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2801373bac4cSAlan Cox { 2802373bac4cSAlan Cox struct serial_struct tmp; 2803373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2804373bac4cSAlan Cox 2805373bac4cSAlan Cox uart_get_info(port, &tmp); 28069cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.irq); 2807373bac4cSAlan Cox } 2808373bac4cSAlan Cox 2809143c02c8SAndy Shevchenko static ssize_t flags_show(struct device *dev, 2810373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2811373bac4cSAlan Cox { 2812373bac4cSAlan Cox struct serial_struct tmp; 2813373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2814373bac4cSAlan Cox 2815373bac4cSAlan Cox uart_get_info(port, &tmp); 28169cfbf7a6SAlex Dewar return sprintf(buf, "0x%X\n", tmp.flags); 2817373bac4cSAlan Cox } 2818373bac4cSAlan Cox 2819143c02c8SAndy Shevchenko static ssize_t xmit_fifo_size_show(struct device *dev, 2820373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2821373bac4cSAlan Cox { 2822373bac4cSAlan Cox struct serial_struct tmp; 2823373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2824373bac4cSAlan Cox 2825373bac4cSAlan Cox uart_get_info(port, &tmp); 28269cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.xmit_fifo_size); 2827373bac4cSAlan Cox } 2828373bac4cSAlan Cox 2829143c02c8SAndy Shevchenko static ssize_t close_delay_show(struct device *dev, 2830373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2831373bac4cSAlan Cox { 2832373bac4cSAlan Cox struct serial_struct tmp; 2833373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2834373bac4cSAlan Cox 2835373bac4cSAlan Cox uart_get_info(port, &tmp); 28369cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.close_delay); 2837373bac4cSAlan Cox } 2838373bac4cSAlan Cox 2839143c02c8SAndy Shevchenko static ssize_t closing_wait_show(struct device *dev, 2840373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2841373bac4cSAlan Cox { 2842373bac4cSAlan Cox struct serial_struct tmp; 2843373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2844373bac4cSAlan Cox 2845373bac4cSAlan Cox uart_get_info(port, &tmp); 28469cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.closing_wait); 2847373bac4cSAlan Cox } 2848373bac4cSAlan Cox 2849143c02c8SAndy Shevchenko static ssize_t custom_divisor_show(struct device *dev, 2850373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2851373bac4cSAlan Cox { 2852373bac4cSAlan Cox struct serial_struct tmp; 2853373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2854373bac4cSAlan Cox 2855373bac4cSAlan Cox uart_get_info(port, &tmp); 28569cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.custom_divisor); 2857373bac4cSAlan Cox } 2858373bac4cSAlan Cox 2859143c02c8SAndy Shevchenko static ssize_t io_type_show(struct device *dev, 2860373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2861373bac4cSAlan Cox { 2862373bac4cSAlan Cox struct serial_struct tmp; 2863373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2864373bac4cSAlan Cox 2865373bac4cSAlan Cox uart_get_info(port, &tmp); 28669cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.io_type); 2867373bac4cSAlan Cox } 2868373bac4cSAlan Cox 2869143c02c8SAndy Shevchenko static ssize_t iomem_base_show(struct device *dev, 2870373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2871373bac4cSAlan Cox { 2872373bac4cSAlan Cox struct serial_struct tmp; 2873373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2874373bac4cSAlan Cox 2875373bac4cSAlan Cox uart_get_info(port, &tmp); 28769cfbf7a6SAlex Dewar return sprintf(buf, "0x%lX\n", (unsigned long)tmp.iomem_base); 2877373bac4cSAlan Cox } 2878373bac4cSAlan Cox 2879143c02c8SAndy Shevchenko static ssize_t iomem_reg_shift_show(struct device *dev, 2880373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2881373bac4cSAlan Cox { 2882373bac4cSAlan Cox struct serial_struct tmp; 2883373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2884373bac4cSAlan Cox 2885373bac4cSAlan Cox uart_get_info(port, &tmp); 28869cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.iomem_reg_shift); 2887373bac4cSAlan Cox } 2888373bac4cSAlan Cox 2889a3cb39d2SAndy Shevchenko static ssize_t console_show(struct device *dev, 2890a3cb39d2SAndy Shevchenko struct device_attribute *attr, char *buf) 2891a3cb39d2SAndy Shevchenko { 2892a3cb39d2SAndy Shevchenko struct tty_port *port = dev_get_drvdata(dev); 2893a3cb39d2SAndy Shevchenko struct uart_state *state = container_of(port, struct uart_state, port); 2894a3cb39d2SAndy Shevchenko struct uart_port *uport; 2895a3cb39d2SAndy Shevchenko bool console = false; 2896a3cb39d2SAndy Shevchenko 2897a3cb39d2SAndy Shevchenko mutex_lock(&port->mutex); 2898a3cb39d2SAndy Shevchenko uport = uart_port_check(state); 2899a3cb39d2SAndy Shevchenko if (uport) 2900a3cb39d2SAndy Shevchenko console = uart_console_enabled(uport); 2901a3cb39d2SAndy Shevchenko mutex_unlock(&port->mutex); 2902a3cb39d2SAndy Shevchenko 2903a3cb39d2SAndy Shevchenko return sprintf(buf, "%c\n", console ? 'Y' : 'N'); 2904a3cb39d2SAndy Shevchenko } 2905a3cb39d2SAndy Shevchenko 2906a3cb39d2SAndy Shevchenko static ssize_t console_store(struct device *dev, 2907a3cb39d2SAndy Shevchenko struct device_attribute *attr, const char *buf, size_t count) 2908a3cb39d2SAndy Shevchenko { 2909a3cb39d2SAndy Shevchenko struct tty_port *port = dev_get_drvdata(dev); 2910a3cb39d2SAndy Shevchenko struct uart_state *state = container_of(port, struct uart_state, port); 2911a3cb39d2SAndy Shevchenko struct uart_port *uport; 2912a3cb39d2SAndy Shevchenko bool oldconsole, newconsole; 2913a3cb39d2SAndy Shevchenko int ret; 2914a3cb39d2SAndy Shevchenko 2915a3cb39d2SAndy Shevchenko ret = kstrtobool(buf, &newconsole); 2916a3cb39d2SAndy Shevchenko if (ret) 2917a3cb39d2SAndy Shevchenko return ret; 2918a3cb39d2SAndy Shevchenko 2919a3cb39d2SAndy Shevchenko mutex_lock(&port->mutex); 2920a3cb39d2SAndy Shevchenko uport = uart_port_check(state); 2921a3cb39d2SAndy Shevchenko if (uport) { 2922a3cb39d2SAndy Shevchenko oldconsole = uart_console_enabled(uport); 2923a3cb39d2SAndy Shevchenko if (oldconsole && !newconsole) { 2924a3cb39d2SAndy Shevchenko ret = unregister_console(uport->cons); 2925a3cb39d2SAndy Shevchenko } else if (!oldconsole && newconsole) { 2926e0830dbfSJohan Hovold if (uart_console(uport)) { 2927e0830dbfSJohan Hovold uport->console_reinit = 1; 2928a3cb39d2SAndy Shevchenko register_console(uport->cons); 2929e0830dbfSJohan Hovold } else { 2930a3cb39d2SAndy Shevchenko ret = -ENOENT; 2931a3cb39d2SAndy Shevchenko } 2932e0830dbfSJohan Hovold } 2933a3cb39d2SAndy Shevchenko } else { 2934a3cb39d2SAndy Shevchenko ret = -ENXIO; 2935a3cb39d2SAndy Shevchenko } 2936a3cb39d2SAndy Shevchenko mutex_unlock(&port->mutex); 2937a3cb39d2SAndy Shevchenko 2938a3cb39d2SAndy Shevchenko return ret < 0 ? ret : count; 2939a3cb39d2SAndy Shevchenko } 2940a3cb39d2SAndy Shevchenko 2941143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(uartclk); 2942143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(type); 2943143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(line); 2944143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(port); 2945143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(irq); 2946143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(flags); 2947143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(xmit_fifo_size); 2948143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(close_delay); 2949143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(closing_wait); 2950143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(custom_divisor); 2951143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(io_type); 2952143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(iomem_base); 2953143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(iomem_reg_shift); 2954a3cb39d2SAndy Shevchenko static DEVICE_ATTR_RW(console); 29556915c0e4STomas Hlavacek 29566915c0e4STomas Hlavacek static struct attribute *tty_dev_attrs[] = { 2957143c02c8SAndy Shevchenko &dev_attr_uartclk.attr, 2958373bac4cSAlan Cox &dev_attr_type.attr, 2959373bac4cSAlan Cox &dev_attr_line.attr, 2960373bac4cSAlan Cox &dev_attr_port.attr, 2961373bac4cSAlan Cox &dev_attr_irq.attr, 2962373bac4cSAlan Cox &dev_attr_flags.attr, 2963373bac4cSAlan Cox &dev_attr_xmit_fifo_size.attr, 2964373bac4cSAlan Cox &dev_attr_close_delay.attr, 2965373bac4cSAlan Cox &dev_attr_closing_wait.attr, 2966373bac4cSAlan Cox &dev_attr_custom_divisor.attr, 2967373bac4cSAlan Cox &dev_attr_io_type.attr, 2968373bac4cSAlan Cox &dev_attr_iomem_base.attr, 2969373bac4cSAlan Cox &dev_attr_iomem_reg_shift.attr, 2970a3cb39d2SAndy Shevchenko &dev_attr_console.attr, 2971a3cb39d2SAndy Shevchenko NULL 29726915c0e4STomas Hlavacek }; 29736915c0e4STomas Hlavacek 2974b1b79916STomas Hlavacek static const struct attribute_group tty_dev_attr_group = { 29756915c0e4STomas Hlavacek .attrs = tty_dev_attrs, 29766915c0e4STomas Hlavacek }; 29776915c0e4STomas Hlavacek 2978ab4382d2SGreg Kroah-Hartman /** 2979ab4382d2SGreg Kroah-Hartman * uart_add_one_port - attach a driver-defined port structure 2980ab4382d2SGreg Kroah-Hartman * @drv: pointer to the uart low level driver structure for this port 2981ab4382d2SGreg Kroah-Hartman * @uport: uart port structure to use for this port. 2982ab4382d2SGreg Kroah-Hartman * 2983a157270fSAhmed S. Darwish * Context: task context, might sleep 2984a157270fSAhmed S. Darwish * 2985ab4382d2SGreg Kroah-Hartman * This allows the driver to register its own uart_port structure 2986ab4382d2SGreg Kroah-Hartman * with the core driver. The main purpose is to allow the low 2987ab4382d2SGreg Kroah-Hartman * level uart drivers to expand uart_port, rather than having yet 2988ab4382d2SGreg Kroah-Hartman * more levels of structures. 2989ab4382d2SGreg Kroah-Hartman */ 2990ab4382d2SGreg Kroah-Hartman int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport) 2991ab4382d2SGreg Kroah-Hartman { 2992ab4382d2SGreg Kroah-Hartman struct uart_state *state; 2993ab4382d2SGreg Kroah-Hartman struct tty_port *port; 2994ab4382d2SGreg Kroah-Hartman int ret = 0; 2995ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 2996266dcff0SGreg Kroah-Hartman int num_groups; 2997ab4382d2SGreg Kroah-Hartman 2998ab4382d2SGreg Kroah-Hartman if (uport->line >= drv->nr) 2999ab4382d2SGreg Kroah-Hartman return -EINVAL; 3000ab4382d2SGreg Kroah-Hartman 3001ab4382d2SGreg Kroah-Hartman state = drv->state + uport->line; 3002ab4382d2SGreg Kroah-Hartman port = &state->port; 3003ab4382d2SGreg Kroah-Hartman 3004ab4382d2SGreg Kroah-Hartman mutex_lock(&port_mutex); 3005ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 3006ab4382d2SGreg Kroah-Hartman if (state->uart_port) { 3007ab4382d2SGreg Kroah-Hartman ret = -EINVAL; 3008ab4382d2SGreg Kroah-Hartman goto out; 3009ab4382d2SGreg Kroah-Hartman } 3010ab4382d2SGreg Kroah-Hartman 30112b702b9bSPeter Hurley /* Link the port to the driver state table and vice versa */ 30129ed19428SPeter Hurley atomic_set(&state->refcount, 1); 30139ed19428SPeter Hurley init_waitqueue_head(&state->remove_wait); 3014ab4382d2SGreg Kroah-Hartman state->uart_port = uport; 3015ab4382d2SGreg Kroah-Hartman uport->state = state; 3016ab4382d2SGreg Kroah-Hartman 30172b702b9bSPeter Hurley state->pm_state = UART_PM_STATE_UNDEFINED; 30182b702b9bSPeter Hurley uport->cons = drv->cons; 3019959801feSPeter Hurley uport->minor = drv->tty_driver->minor_start + uport->line; 3020f7048b15SVignesh R uport->name = kasprintf(GFP_KERNEL, "%s%d", drv->dev_name, 3021f7048b15SVignesh R drv->tty_driver->name_base + uport->line); 3022f7048b15SVignesh R if (!uport->name) { 3023f7048b15SVignesh R ret = -ENOMEM; 3024f7048b15SVignesh R goto out; 3025f7048b15SVignesh R } 30262b702b9bSPeter Hurley 3027fe88c648SJohan Hovold /* 3028fe88c648SJohan Hovold * If this port is in use as a console then the spinlock is already 3029fe88c648SJohan Hovold * initialised. 3030fe88c648SJohan Hovold */ 3031fe88c648SJohan Hovold if (!uart_console_enabled(uport)) 3032d2403cadSAndy Shevchenko uart_port_spin_lock_init(uport); 3033d2403cadSAndy Shevchenko 3034a208ffd2SGrant Likely if (uport->cons && uport->dev) 3035dd8b7a1dSMichal Simek of_console_check(uport->dev->of_node, uport->cons->name, uport->line); 3036ab4382d2SGreg Kroah-Hartman 3037fb2b9001SSudip Mukherjee tty_port_link_device(port, drv->tty_driver, uport->line); 3038ab4382d2SGreg Kroah-Hartman uart_configure_port(drv, state, uport); 3039ab4382d2SGreg Kroah-Hartman 30404dda864dSGeert Uytterhoeven port->console = uart_console(uport); 30414dda864dSGeert Uytterhoeven 3042266dcff0SGreg Kroah-Hartman num_groups = 2; 3043266dcff0SGreg Kroah-Hartman if (uport->attr_group) 3044266dcff0SGreg Kroah-Hartman num_groups++; 3045266dcff0SGreg Kroah-Hartman 3046c2b703b8SYoshihiro YUNOMAE uport->tty_groups = kcalloc(num_groups, sizeof(*uport->tty_groups), 3047266dcff0SGreg Kroah-Hartman GFP_KERNEL); 3048266dcff0SGreg Kroah-Hartman if (!uport->tty_groups) { 3049266dcff0SGreg Kroah-Hartman ret = -ENOMEM; 3050266dcff0SGreg Kroah-Hartman goto out; 3051266dcff0SGreg Kroah-Hartman } 3052266dcff0SGreg Kroah-Hartman uport->tty_groups[0] = &tty_dev_attr_group; 3053266dcff0SGreg Kroah-Hartman if (uport->attr_group) 3054266dcff0SGreg Kroah-Hartman uport->tty_groups[1] = uport->attr_group; 3055266dcff0SGreg Kroah-Hartman 3056ab4382d2SGreg Kroah-Hartman /* 3057ab4382d2SGreg Kroah-Hartman * Register the port whether it's detected or not. This allows 3058015355b7SGeert Uytterhoeven * setserial to be used to alter this port's parameters. 3059ab4382d2SGreg Kroah-Hartman */ 3060da4c2799SJohan Hovold tty_dev = tty_port_register_device_attr_serdev(port, drv->tty_driver, 3061266dcff0SGreg Kroah-Hartman uport->line, uport->dev, port, uport->tty_groups); 3062b289c496SChengguang Xu if (!IS_ERR(tty_dev)) { 306377359835SSimon Glass device_set_wakeup_capable(tty_dev, 1); 306477359835SSimon Glass } else { 30652f2dafe7SSudip Mukherjee dev_err(uport->dev, "Cannot register tty device on line %d\n", 3066ab4382d2SGreg Kroah-Hartman uport->line); 306777359835SSimon Glass } 3068ab4382d2SGreg Kroah-Hartman 3069ab4382d2SGreg Kroah-Hartman /* 3070ab4382d2SGreg Kroah-Hartman * Ensure UPF_DEAD is not set. 3071ab4382d2SGreg Kroah-Hartman */ 3072ab4382d2SGreg Kroah-Hartman uport->flags &= ~UPF_DEAD; 3073ab4382d2SGreg Kroah-Hartman 3074ab4382d2SGreg Kroah-Hartman out: 3075ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 3076ab4382d2SGreg Kroah-Hartman mutex_unlock(&port_mutex); 3077ab4382d2SGreg Kroah-Hartman 3078ab4382d2SGreg Kroah-Hartman return ret; 3079ab4382d2SGreg Kroah-Hartman } 308015dc475bSJiri Slaby EXPORT_SYMBOL(uart_add_one_port); 3081ab4382d2SGreg Kroah-Hartman 3082ab4382d2SGreg Kroah-Hartman /** 3083ab4382d2SGreg Kroah-Hartman * uart_remove_one_port - detach a driver defined port structure 3084ab4382d2SGreg Kroah-Hartman * @drv: pointer to the uart low level driver structure for this port 3085ab4382d2SGreg Kroah-Hartman * @uport: uart port structure for this port 3086ab4382d2SGreg Kroah-Hartman * 3087a157270fSAhmed S. Darwish * Context: task context, might sleep 3088a157270fSAhmed S. Darwish * 3089ab4382d2SGreg Kroah-Hartman * This unhooks (and hangs up) the specified port structure from the 3090ab4382d2SGreg Kroah-Hartman * core driver. No further calls will be made to the low-level code 3091ab4382d2SGreg Kroah-Hartman * for this port. 3092ab4382d2SGreg Kroah-Hartman */ 3093ab4382d2SGreg Kroah-Hartman int uart_remove_one_port(struct uart_driver *drv, struct uart_port *uport) 3094ab4382d2SGreg Kroah-Hartman { 3095ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 3096ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 30974047b371SPeter Hurley struct uart_port *uart_port; 30984c6d5b4dSGeert Uytterhoeven struct tty_struct *tty; 3099b342dd51SChen Gang int ret = 0; 3100ab4382d2SGreg Kroah-Hartman 3101ab4382d2SGreg Kroah-Hartman mutex_lock(&port_mutex); 3102ab4382d2SGreg Kroah-Hartman 3103ab4382d2SGreg Kroah-Hartman /* 3104ab4382d2SGreg Kroah-Hartman * Mark the port "dead" - this prevents any opens from 3105ab4382d2SGreg Kroah-Hartman * succeeding while we shut down the port. 3106ab4382d2SGreg Kroah-Hartman */ 3107ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 31084047b371SPeter Hurley uart_port = uart_port_check(state); 31094047b371SPeter Hurley if (uart_port != uport) 31104047b371SPeter Hurley dev_alert(uport->dev, "Removing wrong port: %p != %p\n", 31114047b371SPeter Hurley uart_port, uport); 31124047b371SPeter Hurley 31134047b371SPeter Hurley if (!uart_port) { 3114b342dd51SChen Gang mutex_unlock(&port->mutex); 3115b342dd51SChen Gang ret = -EINVAL; 3116b342dd51SChen Gang goto out; 3117b342dd51SChen Gang } 3118ab4382d2SGreg Kroah-Hartman uport->flags |= UPF_DEAD; 3119ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 3120ab4382d2SGreg Kroah-Hartman 3121ab4382d2SGreg Kroah-Hartman /* 3122ab4382d2SGreg Kroah-Hartman * Remove the devices from the tty layer 3123ab4382d2SGreg Kroah-Hartman */ 3124da4c2799SJohan Hovold tty_port_unregister_device(port, drv->tty_driver, uport->line); 3125ab4382d2SGreg Kroah-Hartman 31264c6d5b4dSGeert Uytterhoeven tty = tty_port_tty_get(port); 31274c6d5b4dSGeert Uytterhoeven if (tty) { 3128ab4382d2SGreg Kroah-Hartman tty_vhangup(port->tty); 31294c6d5b4dSGeert Uytterhoeven tty_kref_put(tty); 31304c6d5b4dSGeert Uytterhoeven } 3131ab4382d2SGreg Kroah-Hartman 3132ab4382d2SGreg Kroah-Hartman /* 31335f5c9ae5SGeert Uytterhoeven * If the port is used as a console, unregister it 31345f5c9ae5SGeert Uytterhoeven */ 31355f5c9ae5SGeert Uytterhoeven if (uart_console(uport)) 31365f5c9ae5SGeert Uytterhoeven unregister_console(uport->cons); 31375f5c9ae5SGeert Uytterhoeven 31385f5c9ae5SGeert Uytterhoeven /* 3139ab4382d2SGreg Kroah-Hartman * Free the port IO and memory resources, if any. 3140ab4382d2SGreg Kroah-Hartman */ 3141a7cfaf16SFabio Estevam if (uport->type != PORT_UNKNOWN && uport->ops->release_port) 3142ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 3143266dcff0SGreg Kroah-Hartman kfree(uport->tty_groups); 3144f7048b15SVignesh R kfree(uport->name); 3145ab4382d2SGreg Kroah-Hartman 3146ab4382d2SGreg Kroah-Hartman /* 3147ab4382d2SGreg Kroah-Hartman * Indicate that there isn't a port here anymore. 3148ab4382d2SGreg Kroah-Hartman */ 3149ab4382d2SGreg Kroah-Hartman uport->type = PORT_UNKNOWN; 3150ab4382d2SGreg Kroah-Hartman 31514047b371SPeter Hurley mutex_lock(&port->mutex); 31529ed19428SPeter Hurley WARN_ON(atomic_dec_return(&state->refcount) < 0); 31539ed19428SPeter Hurley wait_event(state->remove_wait, !atomic_read(&state->refcount)); 3154ab4382d2SGreg Kroah-Hartman state->uart_port = NULL; 31554047b371SPeter Hurley mutex_unlock(&port->mutex); 3156b342dd51SChen Gang out: 3157ab4382d2SGreg Kroah-Hartman mutex_unlock(&port_mutex); 3158ab4382d2SGreg Kroah-Hartman 3159b342dd51SChen Gang return ret; 3160ab4382d2SGreg Kroah-Hartman } 316115dc475bSJiri Slaby EXPORT_SYMBOL(uart_remove_one_port); 3162ab4382d2SGreg Kroah-Hartman 3163ab4382d2SGreg Kroah-Hartman /* 3164ab4382d2SGreg Kroah-Hartman * Are the two ports equivalent? 3165ab4382d2SGreg Kroah-Hartman */ 3166b8be5db5SJiri Slaby bool uart_match_port(const struct uart_port *port1, 3167b8be5db5SJiri Slaby const struct uart_port *port2) 3168ab4382d2SGreg Kroah-Hartman { 3169ab4382d2SGreg Kroah-Hartman if (port1->iotype != port2->iotype) 3170b8be5db5SJiri Slaby return false; 3171ab4382d2SGreg Kroah-Hartman 3172ab4382d2SGreg Kroah-Hartman switch (port1->iotype) { 3173ab4382d2SGreg Kroah-Hartman case UPIO_PORT: 3174b8be5db5SJiri Slaby return port1->iobase == port2->iobase; 3175ab4382d2SGreg Kroah-Hartman case UPIO_HUB6: 3176b8be5db5SJiri Slaby return port1->iobase == port2->iobase && 3177b8be5db5SJiri Slaby port1->hub6 == port2->hub6; 3178ab4382d2SGreg Kroah-Hartman case UPIO_MEM: 3179bd94c407SMasahiro Yamada case UPIO_MEM16: 3180ab4382d2SGreg Kroah-Hartman case UPIO_MEM32: 31813ffb1a81SKevin Cernekee case UPIO_MEM32BE: 3182ab4382d2SGreg Kroah-Hartman case UPIO_AU: 3183ab4382d2SGreg Kroah-Hartman case UPIO_TSI: 3184b8be5db5SJiri Slaby return port1->mapbase == port2->mapbase; 3185ab4382d2SGreg Kroah-Hartman } 3186b8be5db5SJiri Slaby 3187b8be5db5SJiri Slaby return false; 3188ab4382d2SGreg Kroah-Hartman } 3189ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_match_port); 3190ab4382d2SGreg Kroah-Hartman 3191027d7dacSJiri Slaby /** 3192027d7dacSJiri Slaby * uart_handle_dcd_change - handle a change of carrier detect state 3193027d7dacSJiri Slaby * @uport: uart_port structure for the open port 3194027d7dacSJiri Slaby * @status: new carrier detect status, nonzero if active 31954d90bb14SPeter Hurley * 31964d90bb14SPeter Hurley * Caller must hold uport->lock 3197027d7dacSJiri Slaby */ 3198027d7dacSJiri Slaby void uart_handle_dcd_change(struct uart_port *uport, unsigned int status) 3199027d7dacSJiri Slaby { 320042381572SGeorge Spelvin struct tty_port *port = &uport->state->port; 320143eca0aeSAlan Cox struct tty_struct *tty = port->tty; 3202c993257bSPeter Hurley struct tty_ldisc *ld; 3203027d7dacSJiri Slaby 32044d90bb14SPeter Hurley lockdep_assert_held_once(&uport->lock); 32054d90bb14SPeter Hurley 3206c993257bSPeter Hurley if (tty) { 3207c993257bSPeter Hurley ld = tty_ldisc_ref(tty); 320842381572SGeorge Spelvin if (ld) { 320942381572SGeorge Spelvin if (ld->ops->dcd_change) 3210593fb1aeSGeorge Spelvin ld->ops->dcd_change(tty, status); 321142381572SGeorge Spelvin tty_ldisc_deref(ld); 321242381572SGeorge Spelvin } 3213c993257bSPeter Hurley } 3214027d7dacSJiri Slaby 3215027d7dacSJiri Slaby uport->icount.dcd++; 3216027d7dacSJiri Slaby 3217299245a1SPeter Hurley if (uart_dcd_enabled(uport)) { 3218027d7dacSJiri Slaby if (status) 3219027d7dacSJiri Slaby wake_up_interruptible(&port->open_wait); 322043eca0aeSAlan Cox else if (tty) 322143eca0aeSAlan Cox tty_hangup(tty); 3222027d7dacSJiri Slaby } 3223027d7dacSJiri Slaby } 3224027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_handle_dcd_change); 3225027d7dacSJiri Slaby 3226027d7dacSJiri Slaby /** 3227027d7dacSJiri Slaby * uart_handle_cts_change - handle a change of clear-to-send state 3228027d7dacSJiri Slaby * @uport: uart_port structure for the open port 3229027d7dacSJiri Slaby * @status: new clear to send status, nonzero if active 32304d90bb14SPeter Hurley * 32314d90bb14SPeter Hurley * Caller must hold uport->lock 3232027d7dacSJiri Slaby */ 3233027d7dacSJiri Slaby void uart_handle_cts_change(struct uart_port *uport, unsigned int status) 3234027d7dacSJiri Slaby { 32354d90bb14SPeter Hurley lockdep_assert_held_once(&uport->lock); 32364d90bb14SPeter Hurley 3237027d7dacSJiri Slaby uport->icount.cts++; 3238027d7dacSJiri Slaby 3239391f93f2SPeter Hurley if (uart_softcts_mode(uport)) { 3240d01f4d18SPeter Hurley if (uport->hw_stopped) { 3241027d7dacSJiri Slaby if (status) { 3242d01f4d18SPeter Hurley uport->hw_stopped = 0; 3243027d7dacSJiri Slaby uport->ops->start_tx(uport); 3244027d7dacSJiri Slaby uart_write_wakeup(uport); 3245027d7dacSJiri Slaby } 3246027d7dacSJiri Slaby } else { 3247027d7dacSJiri Slaby if (!status) { 3248d01f4d18SPeter Hurley uport->hw_stopped = 1; 3249027d7dacSJiri Slaby uport->ops->stop_tx(uport); 3250027d7dacSJiri Slaby } 3251027d7dacSJiri Slaby } 3252391f93f2SPeter Hurley 3253027d7dacSJiri Slaby } 3254027d7dacSJiri Slaby } 3255027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_handle_cts_change); 3256027d7dacSJiri Slaby 3257cf75525fSJiri Slaby /** 3258cf75525fSJiri Slaby * uart_insert_char - push a char to the uart layer 3259cf75525fSJiri Slaby * 3260cf75525fSJiri Slaby * User is responsible to call tty_flip_buffer_push when they are done with 3261cf75525fSJiri Slaby * insertion. 3262cf75525fSJiri Slaby * 3263cf75525fSJiri Slaby * @port: corresponding port 3264cf75525fSJiri Slaby * @status: state of the serial port RX buffer (LSR for 8250) 3265cf75525fSJiri Slaby * @overrun: mask of overrun bits in @status 3266cf75525fSJiri Slaby * @ch: character to push 3267cf75525fSJiri Slaby * @flag: flag for the character (see TTY_NORMAL and friends) 3268cf75525fSJiri Slaby */ 3269027d7dacSJiri Slaby void uart_insert_char(struct uart_port *port, unsigned int status, 3270027d7dacSJiri Slaby unsigned int overrun, unsigned int ch, unsigned int flag) 3271027d7dacSJiri Slaby { 327292a19f9cSJiri Slaby struct tty_port *tport = &port->state->port; 3273027d7dacSJiri Slaby 3274027d7dacSJiri Slaby if ((status & port->ignore_status_mask & ~overrun) == 0) 327592a19f9cSJiri Slaby if (tty_insert_flip_char(tport, ch, flag) == 0) 3276dabfb351SCorbin ++port->icount.buf_overrun; 3277027d7dacSJiri Slaby 3278027d7dacSJiri Slaby /* 3279027d7dacSJiri Slaby * Overrun is special. Since it's reported immediately, 3280027d7dacSJiri Slaby * it doesn't affect the current character. 3281027d7dacSJiri Slaby */ 3282027d7dacSJiri Slaby if (status & ~port->ignore_status_mask & overrun) 328392a19f9cSJiri Slaby if (tty_insert_flip_char(tport, 0, TTY_OVERRUN) == 0) 3284dabfb351SCorbin ++port->icount.buf_overrun; 3285027d7dacSJiri Slaby } 3286027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_insert_char); 3287027d7dacSJiri Slaby 328868af4317SDmitry Safonov #ifdef CONFIG_MAGIC_SYSRQ_SERIAL 328968af4317SDmitry Safonov static const char sysrq_toggle_seq[] = CONFIG_MAGIC_SYSRQ_SERIAL_SEQUENCE; 329068af4317SDmitry Safonov 329168af4317SDmitry Safonov static void uart_sysrq_on(struct work_struct *w) 329268af4317SDmitry Safonov { 3293b18896ffSAndy Shevchenko int sysrq_toggle_seq_len = strlen(sysrq_toggle_seq); 3294b18896ffSAndy Shevchenko 329568af4317SDmitry Safonov sysrq_toggle_support(1); 3296b18896ffSAndy Shevchenko pr_info("SysRq is enabled by magic sequence '%*pE' on serial\n", 3297b18896ffSAndy Shevchenko sysrq_toggle_seq_len, sysrq_toggle_seq); 329868af4317SDmitry Safonov } 329968af4317SDmitry Safonov static DECLARE_WORK(sysrq_enable_work, uart_sysrq_on); 330068af4317SDmitry Safonov 330168af4317SDmitry Safonov /** 330268af4317SDmitry Safonov * uart_try_toggle_sysrq - Enables SysRq from serial line 330368af4317SDmitry Safonov * @port: uart_port structure where char(s) after BREAK met 330468af4317SDmitry Safonov * @ch: new character in the sequence after received BREAK 330568af4317SDmitry Safonov * 330668af4317SDmitry Safonov * Enables magic SysRq when the required sequence is met on port 330768af4317SDmitry Safonov * (see CONFIG_MAGIC_SYSRQ_SERIAL_SEQUENCE). 330868af4317SDmitry Safonov * 330968af4317SDmitry Safonov * Returns false if @ch is out of enabling sequence and should be 331068af4317SDmitry Safonov * handled some other way, true if @ch was consumed. 331168af4317SDmitry Safonov */ 331208d54703SJohan Hovold bool uart_try_toggle_sysrq(struct uart_port *port, unsigned int ch) 331368af4317SDmitry Safonov { 33142ce5eaceSAndy Shevchenko int sysrq_toggle_seq_len = strlen(sysrq_toggle_seq); 33152ce5eaceSAndy Shevchenko 33162ce5eaceSAndy Shevchenko if (!sysrq_toggle_seq_len) 331768af4317SDmitry Safonov return false; 331868af4317SDmitry Safonov 331968af4317SDmitry Safonov BUILD_BUG_ON(ARRAY_SIZE(sysrq_toggle_seq) >= U8_MAX); 332068af4317SDmitry Safonov if (sysrq_toggle_seq[port->sysrq_seq] != ch) { 332168af4317SDmitry Safonov port->sysrq_seq = 0; 332268af4317SDmitry Safonov return false; 332368af4317SDmitry Safonov } 332468af4317SDmitry Safonov 33252ce5eaceSAndy Shevchenko if (++port->sysrq_seq < sysrq_toggle_seq_len) { 332668af4317SDmitry Safonov port->sysrq = jiffies + SYSRQ_TIMEOUT; 332768af4317SDmitry Safonov return true; 332868af4317SDmitry Safonov } 332968af4317SDmitry Safonov 333068af4317SDmitry Safonov schedule_work(&sysrq_enable_work); 333168af4317SDmitry Safonov 333268af4317SDmitry Safonov port->sysrq = 0; 333368af4317SDmitry Safonov return true; 333468af4317SDmitry Safonov } 333508d54703SJohan Hovold EXPORT_SYMBOL_GPL(uart_try_toggle_sysrq); 333668af4317SDmitry Safonov #endif 333768af4317SDmitry Safonov 3338ef838a81SUwe Kleine-König /** 3339743f93f8SLukas Wunner * uart_get_rs485_mode() - retrieve rs485 properties for given uart 3340a7172561SRandy Dunlap * @port: uart device's target port 3341ef838a81SUwe Kleine-König * 3342ef838a81SUwe Kleine-König * This function implements the device tree binding described in 3343ef838a81SUwe Kleine-König * Documentation/devicetree/bindings/serial/rs485.txt. 3344ef838a81SUwe Kleine-König */ 3345c150c0f3SLukas Wunner int uart_get_rs485_mode(struct uart_port *port) 3346ef838a81SUwe Kleine-König { 3347c150c0f3SLukas Wunner struct serial_rs485 *rs485conf = &port->rs485; 3348c150c0f3SLukas Wunner struct device *dev = port->dev; 3349ef838a81SUwe Kleine-König u32 rs485_delay[2]; 3350ef838a81SUwe Kleine-König int ret; 3351ef838a81SUwe Kleine-König 3352743f93f8SLukas Wunner ret = device_property_read_u32_array(dev, "rs485-rts-delay", 3353743f93f8SLukas Wunner rs485_delay, 2); 3354ef838a81SUwe Kleine-König if (!ret) { 3355ef838a81SUwe Kleine-König rs485conf->delay_rts_before_send = rs485_delay[0]; 3356ef838a81SUwe Kleine-König rs485conf->delay_rts_after_send = rs485_delay[1]; 3357ef838a81SUwe Kleine-König } else { 3358ef838a81SUwe Kleine-König rs485conf->delay_rts_before_send = 0; 3359ef838a81SUwe Kleine-König rs485conf->delay_rts_after_send = 0; 3360ef838a81SUwe Kleine-König } 3361ef838a81SUwe Kleine-König 3362ef838a81SUwe Kleine-König /* 3363f1e5b618SLukas Wunner * Clear full-duplex and enabled flags, set RTS polarity to active high 3364f1e5b618SLukas Wunner * to get to a defined state with the following properties: 3365ef838a81SUwe Kleine-König */ 3366f1e5b618SLukas Wunner rs485conf->flags &= ~(SER_RS485_RX_DURING_TX | SER_RS485_ENABLED | 3367d58a2df3SLukas Wunner SER_RS485_TERMINATE_BUS | 3368f1e5b618SLukas Wunner SER_RS485_RTS_AFTER_SEND); 3369f1e5b618SLukas Wunner rs485conf->flags |= SER_RS485_RTS_ON_SEND; 3370ef838a81SUwe Kleine-König 3371743f93f8SLukas Wunner if (device_property_read_bool(dev, "rs485-rx-during-tx")) 3372ef838a81SUwe Kleine-König rs485conf->flags |= SER_RS485_RX_DURING_TX; 3373ef838a81SUwe Kleine-König 3374743f93f8SLukas Wunner if (device_property_read_bool(dev, "linux,rs485-enabled-at-boot-time")) 3375ef838a81SUwe Kleine-König rs485conf->flags |= SER_RS485_ENABLED; 3376f1e5b618SLukas Wunner 3377f1e5b618SLukas Wunner if (device_property_read_bool(dev, "rs485-rts-active-low")) { 3378f1e5b618SLukas Wunner rs485conf->flags &= ~SER_RS485_RTS_ON_SEND; 3379f1e5b618SLukas Wunner rs485conf->flags |= SER_RS485_RTS_AFTER_SEND; 3380f1e5b618SLukas Wunner } 3381c150c0f3SLukas Wunner 3382d58a2df3SLukas Wunner /* 3383d58a2df3SLukas Wunner * Disabling termination by default is the safe choice: Else if many 3384d58a2df3SLukas Wunner * bus participants enable it, no communication is possible at all. 3385d58a2df3SLukas Wunner * Works fine for short cables and users may enable for longer cables. 3386d58a2df3SLukas Wunner */ 3387d58a2df3SLukas Wunner port->rs485_term_gpio = devm_gpiod_get_optional(dev, "rs485-term", 3388d58a2df3SLukas Wunner GPIOD_OUT_LOW); 3389d58a2df3SLukas Wunner if (IS_ERR(port->rs485_term_gpio)) { 3390d58a2df3SLukas Wunner ret = PTR_ERR(port->rs485_term_gpio); 3391d58a2df3SLukas Wunner port->rs485_term_gpio = NULL; 339289c65d66SKrzysztof Kozlowski return dev_err_probe(dev, ret, "Cannot get rs485-term-gpios\n"); 3393d58a2df3SLukas Wunner } 3394d58a2df3SLukas Wunner 3395c150c0f3SLukas Wunner return 0; 3396ef838a81SUwe Kleine-König } 3397743f93f8SLukas Wunner EXPORT_SYMBOL_GPL(uart_get_rs485_mode); 3398ef838a81SUwe Kleine-König 3399ab4382d2SGreg Kroah-Hartman MODULE_DESCRIPTION("Serial driver core"); 3400ab4382d2SGreg Kroah-Hartman MODULE_LICENSE("GPL"); 3401