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 /** 330f9008285SIlpo 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 * 335f9008285SIlpo Järvinen * Set the port frame timing information from which the FIFO timeout 336f9008285SIlpo Järvinen * value is derived. The @cflag value should reflect the actual hardware 337f9008285SIlpo 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 */ 12880139da50SIlpo Järvinen if (flags & ~port->rs485_supported.flags) 128951ad36baSIlpo Järvinen return -EINVAL; 129051ad36baSIlpo Järvinen 12914f768e94SIlpo Järvinen /* Asking for address w/o addressing mode? */ 12924f768e94SIlpo Järvinen if (!(rs485->flags & SER_RS485_ADDRB) && 12934f768e94SIlpo Järvinen (rs485->flags & (SER_RS485_ADDR_RECV|SER_RS485_ADDR_DEST))) 12944f768e94SIlpo Järvinen return -EINVAL; 12954f768e94SIlpo Järvinen 12964f768e94SIlpo Järvinen /* Address given but not enabled? */ 12974f768e94SIlpo Järvinen if (!(rs485->flags & SER_RS485_ADDR_RECV) && rs485->addr_recv) 12984f768e94SIlpo Järvinen return -EINVAL; 12994f768e94SIlpo Järvinen if (!(rs485->flags & SER_RS485_ADDR_DEST) && rs485->addr_dest) 13004f768e94SIlpo Järvinen return -EINVAL; 13014f768e94SIlpo Järvinen 130251ad36baSIlpo Järvinen return 0; 130351ad36baSIlpo Järvinen } 130451ad36baSIlpo Järvinen 13052dbd0c14SIlpo Järvinen static void uart_sanitize_serial_rs485(struct uart_port *port, struct serial_rs485 *rs485) 13062dbd0c14SIlpo Järvinen { 13070139da50SIlpo Järvinen u32 supported_flags = port->rs485_supported.flags; 1308be2e2cb1SIlpo Järvinen 1309596a9171SIlpo Järvinen if (!(rs485->flags & SER_RS485_ENABLED)) { 1310596a9171SIlpo Järvinen memset(rs485, 0, sizeof(*rs485)); 1311596a9171SIlpo Järvinen return; 1312596a9171SIlpo Järvinen } 1313596a9171SIlpo Järvinen 13142dbd0c14SIlpo Järvinen /* pick sane settings if the user hasn't */ 1315be2e2cb1SIlpo Järvinen if ((supported_flags & (SER_RS485_RTS_ON_SEND|SER_RS485_RTS_AFTER_SEND)) && 1316be2e2cb1SIlpo Järvinen !(rs485->flags & SER_RS485_RTS_ON_SEND) == 13172dbd0c14SIlpo Järvinen !(rs485->flags & SER_RS485_RTS_AFTER_SEND)) { 13182dbd0c14SIlpo Järvinen dev_warn_ratelimited(port->dev, 13192dbd0c14SIlpo Järvinen "%s (%d): invalid RTS setting, using RTS_ON_SEND instead\n", 13202dbd0c14SIlpo Järvinen port->name, port->line); 13212dbd0c14SIlpo Järvinen rs485->flags |= SER_RS485_RTS_ON_SEND; 13222dbd0c14SIlpo Järvinen rs485->flags &= ~SER_RS485_RTS_AFTER_SEND; 1323be2e2cb1SIlpo Järvinen supported_flags |= SER_RS485_RTS_ON_SEND|SER_RS485_RTS_AFTER_SEND; 13242dbd0c14SIlpo Järvinen } 13252dbd0c14SIlpo Järvinen 13260139da50SIlpo Järvinen if (!port->rs485_supported.delay_rts_before_send) { 1327be2e2cb1SIlpo Järvinen if (rs485->delay_rts_before_send) { 1328be2e2cb1SIlpo Järvinen dev_warn_ratelimited(port->dev, 1329be2e2cb1SIlpo Järvinen "%s (%d): RTS delay before sending not supported\n", 1330be2e2cb1SIlpo Järvinen port->name, port->line); 1331be2e2cb1SIlpo Järvinen } 1332be2e2cb1SIlpo Järvinen rs485->delay_rts_before_send = 0; 1333be2e2cb1SIlpo Järvinen } else if (rs485->delay_rts_before_send > RS485_MAX_RTS_DELAY) { 13342dbd0c14SIlpo Järvinen rs485->delay_rts_before_send = RS485_MAX_RTS_DELAY; 13352dbd0c14SIlpo Järvinen dev_warn_ratelimited(port->dev, 13362dbd0c14SIlpo Järvinen "%s (%d): RTS delay before sending clamped to %u ms\n", 13372dbd0c14SIlpo Järvinen port->name, port->line, rs485->delay_rts_before_send); 13382dbd0c14SIlpo Järvinen } 13392dbd0c14SIlpo Järvinen 13400139da50SIlpo Järvinen if (!port->rs485_supported.delay_rts_after_send) { 1341be2e2cb1SIlpo Järvinen if (rs485->delay_rts_after_send) { 1342be2e2cb1SIlpo Järvinen dev_warn_ratelimited(port->dev, 1343be2e2cb1SIlpo Järvinen "%s (%d): RTS delay after sending not supported\n", 1344be2e2cb1SIlpo Järvinen port->name, port->line); 1345be2e2cb1SIlpo Järvinen } 1346be2e2cb1SIlpo Järvinen rs485->delay_rts_after_send = 0; 1347be2e2cb1SIlpo Järvinen } else if (rs485->delay_rts_after_send > RS485_MAX_RTS_DELAY) { 13482dbd0c14SIlpo Järvinen rs485->delay_rts_after_send = RS485_MAX_RTS_DELAY; 13492dbd0c14SIlpo Järvinen dev_warn_ratelimited(port->dev, 13502dbd0c14SIlpo Järvinen "%s (%d): RTS delay after sending clamped to %u ms\n", 13512dbd0c14SIlpo Järvinen port->name, port->line, rs485->delay_rts_after_send); 13522dbd0c14SIlpo Järvinen } 1353be2e2cb1SIlpo Järvinen 1354be2e2cb1SIlpo Järvinen rs485->flags &= supported_flags; 1355be2e2cb1SIlpo Järvinen 13562dbd0c14SIlpo Järvinen /* Return clean padding area to userspace */ 13574f768e94SIlpo Järvinen memset(rs485->padding0, 0, sizeof(rs485->padding0)); 13584f768e94SIlpo Järvinen memset(rs485->padding1, 0, sizeof(rs485->padding1)); 13592dbd0c14SIlpo Järvinen } 13602dbd0c14SIlpo Järvinen 1361*44b27aecSLino Sanfilippo static void uart_set_rs485_termination(struct uart_port *port, 1362*44b27aecSLino Sanfilippo const struct serial_rs485 *rs485) 1363*44b27aecSLino Sanfilippo { 1364*44b27aecSLino Sanfilippo if (!(rs485->flags & SER_RS485_ENABLED)) 1365*44b27aecSLino Sanfilippo return; 1366*44b27aecSLino Sanfilippo 1367*44b27aecSLino Sanfilippo gpiod_set_value_cansleep(port->rs485_term_gpio, 1368*44b27aecSLino Sanfilippo !!(rs485->flags & SER_RS485_TERMINATE_BUS)); 1369*44b27aecSLino Sanfilippo } 1370*44b27aecSLino Sanfilippo 13718322b1f5SIlpo Järvinen int uart_rs485_config(struct uart_port *port) 13728322b1f5SIlpo Järvinen { 1373be2e2cb1SIlpo Järvinen struct serial_rs485 *rs485 = &port->rs485; 1374596a9171SIlpo Järvinen int ret; 1375be2e2cb1SIlpo Järvinen 1376be2e2cb1SIlpo Järvinen uart_sanitize_serial_rs485(port, rs485); 1377*44b27aecSLino Sanfilippo uart_set_rs485_termination(port, rs485); 1378be2e2cb1SIlpo Järvinen 1379ae50bb27SIlpo Järvinen ret = port->rs485_config(port, NULL, rs485); 1380596a9171SIlpo Järvinen if (ret) 1381596a9171SIlpo Järvinen memset(rs485, 0, sizeof(*rs485)); 1382596a9171SIlpo Järvinen 1383596a9171SIlpo Järvinen return ret; 13848322b1f5SIlpo Järvinen } 13858322b1f5SIlpo Järvinen EXPORT_SYMBOL_GPL(uart_rs485_config); 13868322b1f5SIlpo Järvinen 1387a5f276f1SRicardo Ribalda Delgado static int uart_get_rs485_config(struct uart_port *port, 1388a5f276f1SRicardo Ribalda Delgado struct serial_rs485 __user *rs485) 1389a5f276f1SRicardo Ribalda Delgado { 1390bd737f87SRicardo Ribalda Delgado unsigned long flags; 1391bd737f87SRicardo Ribalda Delgado struct serial_rs485 aux; 1392bd737f87SRicardo Ribalda Delgado 1393bd737f87SRicardo Ribalda Delgado spin_lock_irqsave(&port->lock, flags); 1394bd737f87SRicardo Ribalda Delgado aux = port->rs485; 1395bd737f87SRicardo Ribalda Delgado spin_unlock_irqrestore(&port->lock, flags); 1396bd737f87SRicardo Ribalda Delgado 1397bd737f87SRicardo Ribalda Delgado if (copy_to_user(rs485, &aux, sizeof(aux))) 1398a5f276f1SRicardo Ribalda Delgado return -EFAULT; 1399bd737f87SRicardo Ribalda Delgado 1400a5f276f1SRicardo Ribalda Delgado return 0; 1401a5f276f1SRicardo Ribalda Delgado } 1402a5f276f1SRicardo Ribalda Delgado 1403ae50bb27SIlpo Järvinen static int uart_set_rs485_config(struct tty_struct *tty, struct uart_port *port, 1404a5f276f1SRicardo Ribalda Delgado struct serial_rs485 __user *rs485_user) 1405a5f276f1SRicardo Ribalda Delgado { 1406a5f276f1SRicardo Ribalda Delgado struct serial_rs485 rs485; 1407a5f276f1SRicardo Ribalda Delgado int ret; 1408bd737f87SRicardo Ribalda Delgado unsigned long flags; 1409a5f276f1SRicardo Ribalda Delgado 1410a5f276f1SRicardo Ribalda Delgado if (!port->rs485_config) 141179c5966cSJohan Hovold return -ENOTTY; 1412a5f276f1SRicardo Ribalda Delgado 1413a5f276f1SRicardo Ribalda Delgado if (copy_from_user(&rs485, rs485_user, sizeof(*rs485_user))) 1414a5f276f1SRicardo Ribalda Delgado return -EFAULT; 1415a5f276f1SRicardo Ribalda Delgado 141651ad36baSIlpo Järvinen ret = uart_check_rs485_flags(port, &rs485); 141751ad36baSIlpo Järvinen if (ret) 141851ad36baSIlpo Järvinen return ret; 14192dbd0c14SIlpo Järvinen uart_sanitize_serial_rs485(port, &rs485); 1420*44b27aecSLino Sanfilippo uart_set_rs485_termination(port, &rs485); 14210ed12afaSLino Sanfilippo 1422bd737f87SRicardo Ribalda Delgado spin_lock_irqsave(&port->lock, flags); 1423ae50bb27SIlpo Järvinen ret = port->rs485_config(port, &tty->termios, &rs485); 14240ed12afaSLino Sanfilippo if (!ret) 14250ed12afaSLino Sanfilippo port->rs485 = rs485; 1426bd737f87SRicardo Ribalda Delgado spin_unlock_irqrestore(&port->lock, flags); 1427a5f276f1SRicardo Ribalda Delgado if (ret) 1428a5f276f1SRicardo Ribalda Delgado return ret; 1429a5f276f1SRicardo Ribalda Delgado 1430a5f276f1SRicardo Ribalda Delgado if (copy_to_user(rs485_user, &port->rs485, sizeof(port->rs485))) 1431a5f276f1SRicardo Ribalda Delgado return -EFAULT; 1432a5f276f1SRicardo Ribalda Delgado 1433a5f276f1SRicardo Ribalda Delgado return 0; 1434a5f276f1SRicardo Ribalda Delgado } 1435a5f276f1SRicardo Ribalda Delgado 1436ad8c0eaaSNicolas Ferre static int uart_get_iso7816_config(struct uart_port *port, 1437ad8c0eaaSNicolas Ferre struct serial_iso7816 __user *iso7816) 1438ad8c0eaaSNicolas Ferre { 1439ad8c0eaaSNicolas Ferre unsigned long flags; 1440ad8c0eaaSNicolas Ferre struct serial_iso7816 aux; 1441ad8c0eaaSNicolas Ferre 1442ad8c0eaaSNicolas Ferre if (!port->iso7816_config) 144379c5966cSJohan Hovold return -ENOTTY; 1444ad8c0eaaSNicolas Ferre 1445ad8c0eaaSNicolas Ferre spin_lock_irqsave(&port->lock, flags); 1446ad8c0eaaSNicolas Ferre aux = port->iso7816; 1447ad8c0eaaSNicolas Ferre spin_unlock_irqrestore(&port->lock, flags); 1448ad8c0eaaSNicolas Ferre 1449ad8c0eaaSNicolas Ferre if (copy_to_user(iso7816, &aux, sizeof(aux))) 1450ad8c0eaaSNicolas Ferre return -EFAULT; 1451ad8c0eaaSNicolas Ferre 1452ad8c0eaaSNicolas Ferre return 0; 1453ad8c0eaaSNicolas Ferre } 1454ad8c0eaaSNicolas Ferre 1455ad8c0eaaSNicolas Ferre static int uart_set_iso7816_config(struct uart_port *port, 1456ad8c0eaaSNicolas Ferre struct serial_iso7816 __user *iso7816_user) 1457ad8c0eaaSNicolas Ferre { 1458ad8c0eaaSNicolas Ferre struct serial_iso7816 iso7816; 1459ad8c0eaaSNicolas Ferre int i, ret; 1460ad8c0eaaSNicolas Ferre unsigned long flags; 1461ad8c0eaaSNicolas Ferre 1462ad8c0eaaSNicolas Ferre if (!port->iso7816_config) 146379c5966cSJohan Hovold return -ENOTTY; 1464ad8c0eaaSNicolas Ferre 1465ad8c0eaaSNicolas Ferre if (copy_from_user(&iso7816, iso7816_user, sizeof(*iso7816_user))) 1466ad8c0eaaSNicolas Ferre return -EFAULT; 1467ad8c0eaaSNicolas Ferre 1468ad8c0eaaSNicolas Ferre /* 1469ad8c0eaaSNicolas Ferre * There are 5 words reserved for future use. Check that userspace 1470ad8c0eaaSNicolas Ferre * doesn't put stuff in there to prevent breakages in the future. 1471ad8c0eaaSNicolas Ferre */ 1472ad8c0eaaSNicolas Ferre for (i = 0; i < 5; i++) 1473ad8c0eaaSNicolas Ferre if (iso7816.reserved[i]) 1474ad8c0eaaSNicolas Ferre return -EINVAL; 1475ad8c0eaaSNicolas Ferre 1476ad8c0eaaSNicolas Ferre spin_lock_irqsave(&port->lock, flags); 1477ad8c0eaaSNicolas Ferre ret = port->iso7816_config(port, &iso7816); 1478ad8c0eaaSNicolas Ferre spin_unlock_irqrestore(&port->lock, flags); 1479ad8c0eaaSNicolas Ferre if (ret) 1480ad8c0eaaSNicolas Ferre return ret; 1481ad8c0eaaSNicolas Ferre 1482ad8c0eaaSNicolas Ferre if (copy_to_user(iso7816_user, &port->iso7816, sizeof(port->iso7816))) 1483ad8c0eaaSNicolas Ferre return -EFAULT; 1484ad8c0eaaSNicolas Ferre 1485ad8c0eaaSNicolas Ferre return 0; 1486ad8c0eaaSNicolas Ferre } 1487ad8c0eaaSNicolas Ferre 1488ab4382d2SGreg Kroah-Hartman /* 1489ab4382d2SGreg Kroah-Hartman * Called via sys_ioctl. We can use spin_lock_irq() here. 1490ab4382d2SGreg Kroah-Hartman */ 1491ab4382d2SGreg Kroah-Hartman static int 14924047b371SPeter Hurley uart_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg) 1493ab4382d2SGreg Kroah-Hartman { 1494ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1495ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 14964047b371SPeter Hurley struct uart_port *uport; 1497ab4382d2SGreg Kroah-Hartman void __user *uarg = (void __user *)arg; 1498ab4382d2SGreg Kroah-Hartman int ret = -ENOIOCTLCMD; 1499ab4382d2SGreg Kroah-Hartman 1500ab4382d2SGreg Kroah-Hartman 1501ab4382d2SGreg Kroah-Hartman /* 1502ab4382d2SGreg Kroah-Hartman * These ioctls don't rely on the hardware to be present. 1503ab4382d2SGreg Kroah-Hartman */ 1504ab4382d2SGreg Kroah-Hartman switch (cmd) { 1505ab4382d2SGreg Kroah-Hartman case TIOCSERCONFIG: 15067c8ab967SPeter Hurley down_write(&tty->termios_rwsem); 1507ab4382d2SGreg Kroah-Hartman ret = uart_do_autoconfig(tty, state); 15087c8ab967SPeter Hurley up_write(&tty->termios_rwsem); 1509ab4382d2SGreg Kroah-Hartman break; 1510ab4382d2SGreg Kroah-Hartman } 1511ab4382d2SGreg Kroah-Hartman 1512ab4382d2SGreg Kroah-Hartman if (ret != -ENOIOCTLCMD) 1513ab4382d2SGreg Kroah-Hartman goto out; 1514ab4382d2SGreg Kroah-Hartman 151518900ca6SPeter Hurley if (tty_io_error(tty)) { 1516ab4382d2SGreg Kroah-Hartman ret = -EIO; 1517ab4382d2SGreg Kroah-Hartman goto out; 1518ab4382d2SGreg Kroah-Hartman } 1519ab4382d2SGreg Kroah-Hartman 1520ab4382d2SGreg Kroah-Hartman /* 1521ab4382d2SGreg Kroah-Hartman * The following should only be used when hardware is present. 1522ab4382d2SGreg Kroah-Hartman */ 1523ab4382d2SGreg Kroah-Hartman switch (cmd) { 1524ab4382d2SGreg Kroah-Hartman case TIOCMIWAIT: 1525ab4382d2SGreg Kroah-Hartman ret = uart_wait_modem_status(state, arg); 1526ab4382d2SGreg Kroah-Hartman break; 1527ab4382d2SGreg Kroah-Hartman } 1528ab4382d2SGreg Kroah-Hartman 1529ab4382d2SGreg Kroah-Hartman if (ret != -ENOIOCTLCMD) 1530ab4382d2SGreg Kroah-Hartman goto out; 1531ab4382d2SGreg Kroah-Hartman 1532ae50bb27SIlpo Järvinen /* rs485_config requires more locking than others */ 1533ae50bb27SIlpo Järvinen if (cmd == TIOCGRS485) 1534ae50bb27SIlpo Järvinen down_write(&tty->termios_rwsem); 1535ae50bb27SIlpo Järvinen 1536ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 15374047b371SPeter Hurley uport = uart_port_check(state); 1538ab4382d2SGreg Kroah-Hartman 15394047b371SPeter Hurley if (!uport || tty_io_error(tty)) { 1540ab4382d2SGreg Kroah-Hartman ret = -EIO; 1541ab4382d2SGreg Kroah-Hartman goto out_up; 1542ab4382d2SGreg Kroah-Hartman } 1543ab4382d2SGreg Kroah-Hartman 1544ab4382d2SGreg Kroah-Hartman /* 1545ab4382d2SGreg Kroah-Hartman * All these rely on hardware being present and need to be 1546ab4382d2SGreg Kroah-Hartman * protected against the tty being hung up. 1547ab4382d2SGreg Kroah-Hartman */ 1548a9c20a9cSRicardo Ribalda Delgado 1549ab4382d2SGreg Kroah-Hartman switch (cmd) { 1550a9c20a9cSRicardo Ribalda Delgado case TIOCSERGETLSR: /* Get line status register */ 1551a9c20a9cSRicardo Ribalda Delgado ret = uart_get_lsr_info(tty, state, uarg); 1552a9c20a9cSRicardo Ribalda Delgado break; 1553a9c20a9cSRicardo Ribalda Delgado 1554a5f276f1SRicardo Ribalda Delgado case TIOCGRS485: 15554047b371SPeter Hurley ret = uart_get_rs485_config(uport, uarg); 1556a5f276f1SRicardo Ribalda Delgado break; 1557a5f276f1SRicardo Ribalda Delgado 1558a5f276f1SRicardo Ribalda Delgado case TIOCSRS485: 1559ae50bb27SIlpo Järvinen ret = uart_set_rs485_config(tty, uport, uarg); 1560a5f276f1SRicardo Ribalda Delgado break; 1561ad8c0eaaSNicolas Ferre 1562ad8c0eaaSNicolas Ferre case TIOCSISO7816: 1563ad8c0eaaSNicolas Ferre ret = uart_set_iso7816_config(state->uart_port, uarg); 1564ad8c0eaaSNicolas Ferre break; 1565ad8c0eaaSNicolas Ferre 1566ad8c0eaaSNicolas Ferre case TIOCGISO7816: 1567ad8c0eaaSNicolas Ferre ret = uart_get_iso7816_config(state->uart_port, uarg); 1568ad8c0eaaSNicolas Ferre break; 15694047b371SPeter Hurley default: 1570ab4382d2SGreg Kroah-Hartman if (uport->ops->ioctl) 1571ab4382d2SGreg Kroah-Hartman ret = uport->ops->ioctl(uport, cmd, arg); 1572ab4382d2SGreg Kroah-Hartman break; 1573ab4382d2SGreg Kroah-Hartman } 1574ab4382d2SGreg Kroah-Hartman out_up: 1575ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1576ae50bb27SIlpo Järvinen if (cmd == TIOCGRS485) 1577ae50bb27SIlpo Järvinen up_write(&tty->termios_rwsem); 1578ab4382d2SGreg Kroah-Hartman out: 1579ab4382d2SGreg Kroah-Hartman return ret; 1580ab4382d2SGreg Kroah-Hartman } 1581ab4382d2SGreg Kroah-Hartman 1582ab4382d2SGreg Kroah-Hartman static void uart_set_ldisc(struct tty_struct *tty) 1583ab4382d2SGreg Kroah-Hartman { 1584ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 15854047b371SPeter Hurley struct uart_port *uport; 15862f70e49eSAlexey Kardashevskiy struct tty_port *port = &state->port; 15872f70e49eSAlexey Kardashevskiy 15882f70e49eSAlexey Kardashevskiy if (!tty_port_initialized(port)) 15892f70e49eSAlexey Kardashevskiy return; 1590ab4382d2SGreg Kroah-Hartman 1591db1b9dfcSPeter Hurley mutex_lock(&state->port.mutex); 15924047b371SPeter Hurley uport = uart_port_check(state); 15934047b371SPeter Hurley if (uport && uport->ops->set_ldisc) 1594732a84a0SPeter Hurley uport->ops->set_ldisc(uport, &tty->termios); 1595db1b9dfcSPeter Hurley mutex_unlock(&state->port.mutex); 1596db1b9dfcSPeter Hurley } 1597ab4382d2SGreg Kroah-Hartman 1598ab4382d2SGreg Kroah-Hartman static void uart_set_termios(struct tty_struct *tty, 1599ab4382d2SGreg Kroah-Hartman struct ktermios *old_termios) 1600ab4382d2SGreg Kroah-Hartman { 1601ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 16024047b371SPeter Hurley struct uart_port *uport; 1603adc8d746SAlan Cox unsigned int cflag = tty->termios.c_cflag; 16042cbacafdSRussell King unsigned int iflag_mask = IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK; 16052cbacafdSRussell King bool sw_changed = false; 1606ab4382d2SGreg Kroah-Hartman 16074047b371SPeter Hurley mutex_lock(&state->port.mutex); 16084047b371SPeter Hurley uport = uart_port_check(state); 16094047b371SPeter Hurley if (!uport) 16104047b371SPeter Hurley goto out; 16114047b371SPeter Hurley 16122cbacafdSRussell King /* 16132cbacafdSRussell King * Drivers doing software flow control also need to know 16142cbacafdSRussell King * about changes to these input settings. 16152cbacafdSRussell King */ 16162cbacafdSRussell King if (uport->flags & UPF_SOFT_FLOW) { 16172cbacafdSRussell King iflag_mask |= IXANY|IXON|IXOFF; 16182cbacafdSRussell King sw_changed = 16192cbacafdSRussell King tty->termios.c_cc[VSTART] != old_termios->c_cc[VSTART] || 16202cbacafdSRussell King tty->termios.c_cc[VSTOP] != old_termios->c_cc[VSTOP]; 16212cbacafdSRussell King } 1622ab4382d2SGreg Kroah-Hartman 1623ab4382d2SGreg Kroah-Hartman /* 1624ab4382d2SGreg Kroah-Hartman * These are the bits that are used to setup various 1625ab4382d2SGreg Kroah-Hartman * flags in the low level driver. We can ignore the Bfoo 1626ab4382d2SGreg Kroah-Hartman * bits in c_cflag; c_[io]speed will always be set 1627ab4382d2SGreg Kroah-Hartman * appropriately by set_termios() in tty_ioctl.c 1628ab4382d2SGreg Kroah-Hartman */ 1629ab4382d2SGreg Kroah-Hartman if ((cflag ^ old_termios->c_cflag) == 0 && 1630adc8d746SAlan Cox tty->termios.c_ospeed == old_termios->c_ospeed && 1631adc8d746SAlan Cox tty->termios.c_ispeed == old_termios->c_ispeed && 16322cbacafdSRussell King ((tty->termios.c_iflag ^ old_termios->c_iflag) & iflag_mask) == 0 && 16332cbacafdSRussell King !sw_changed) { 16344047b371SPeter Hurley goto out; 1635ab4382d2SGreg Kroah-Hartman } 1636ab4382d2SGreg Kroah-Hartman 1637ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, old_termios); 1638c7a6b9e4SHariprasad Kelam /* reload cflag from termios; port driver may have overridden flags */ 1639c18b55fdSPeter Hurley cflag = tty->termios.c_cflag; 1640ab4382d2SGreg Kroah-Hartman 1641ab4382d2SGreg Kroah-Hartman /* Handle transition to B0 status */ 1642ab4382d2SGreg Kroah-Hartman if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) 1643dec94e70SRussell King uart_clear_mctrl(uport, TIOCM_RTS | TIOCM_DTR); 1644ab4382d2SGreg Kroah-Hartman /* Handle transition away from B0 status */ 1645ab4382d2SGreg Kroah-Hartman else if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { 1646ab4382d2SGreg Kroah-Hartman unsigned int mask = TIOCM_DTR; 16474ed71addSTamseel Shams 164897ef38b8SPeter Hurley if (!(cflag & CRTSCTS) || !tty_throttled(tty)) 1649ab4382d2SGreg Kroah-Hartman mask |= TIOCM_RTS; 1650dec94e70SRussell King uart_set_mctrl(uport, mask); 1651ab4382d2SGreg Kroah-Hartman } 16524047b371SPeter Hurley out: 16534047b371SPeter Hurley mutex_unlock(&state->port.mutex); 1654ab4382d2SGreg Kroah-Hartman } 1655ab4382d2SGreg Kroah-Hartman 1656ab4382d2SGreg Kroah-Hartman /* 1657ef4f527cSKevin Cernekee * Calls to uart_close() are serialised via the tty_lock in 1658ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:tty_release() 1659ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:do_tty_hangup() 1660ab4382d2SGreg Kroah-Hartman */ 1661ab4382d2SGreg Kroah-Hartman static void uart_close(struct tty_struct *tty, struct file *filp) 1662ab4382d2SGreg Kroah-Hartman { 1663ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1664ab4382d2SGreg Kroah-Hartman 166591b32f54SPeter Hurley if (!state) { 166691b32f54SPeter Hurley struct uart_driver *drv = tty->driver->driver_state; 16679356335fSColin Ian King struct tty_port *port; 166891b32f54SPeter Hurley 166991b32f54SPeter Hurley state = drv->state + tty->index; 167091b32f54SPeter Hurley port = &state->port; 167191b32f54SPeter Hurley spin_lock_irq(&port->lock); 167291b32f54SPeter Hurley --port->count; 167391b32f54SPeter Hurley spin_unlock_irq(&port->lock); 1674ab4382d2SGreg Kroah-Hartman return; 167591b32f54SPeter Hurley } 1676ab4382d2SGreg Kroah-Hartman 167739b3d892SPeter Hurley pr_debug("uart_close(%d) called\n", tty->index); 1678ab4382d2SGreg Kroah-Hartman 1679761ed4a9SRob Herring tty_port_close(tty->port, tty, filp); 1680761ed4a9SRob Herring } 1681ab4382d2SGreg Kroah-Hartman 1682761ed4a9SRob Herring static void uart_tty_port_shutdown(struct tty_port *port) 1683761ed4a9SRob Herring { 1684761ed4a9SRob Herring struct uart_state *state = container_of(port, struct uart_state, port); 1685761ed4a9SRob Herring struct uart_port *uport = uart_port_check(state); 168600de977fSJohan Hovold char *buf; 1687af224ca2SPeter Hurley 1688ab4382d2SGreg Kroah-Hartman /* 1689ab4382d2SGreg Kroah-Hartman * At this point, we stop accepting input. To do this, we 1690ab4382d2SGreg Kroah-Hartman * disable the receive line status interrupts. 1691ab4382d2SGreg Kroah-Hartman */ 1692a5a2b130SAndy Shevchenko if (WARN(!uport, "detached port still initialized!\n")) 1693a5a2b130SAndy Shevchenko return; 1694761ed4a9SRob Herring 1695a5a2b130SAndy Shevchenko spin_lock_irq(&uport->lock); 1696ab4382d2SGreg Kroah-Hartman uport->ops->stop_rx(uport); 16976fb98fb3SPeter Hurley spin_unlock_irq(&uport->lock); 1698761ed4a9SRob Herring 1699761ed4a9SRob Herring uart_port_shutdown(port); 1700761ed4a9SRob Herring 1701ab4382d2SGreg Kroah-Hartman /* 1702761ed4a9SRob Herring * It's possible for shutdown to be called after suspend if we get 1703761ed4a9SRob Herring * a DCD drop (hangup) at just the right time. Clear suspended bit so 1704761ed4a9SRob Herring * we don't try to resume a port that has been shutdown. 1705ab4382d2SGreg Kroah-Hartman */ 1706761ed4a9SRob Herring tty_port_set_suspended(port, 0); 1707ab4382d2SGreg Kroah-Hartman 170800de977fSJohan Hovold /* 170900de977fSJohan Hovold * Free the transmit buffer. 171000de977fSJohan Hovold */ 171100de977fSJohan Hovold spin_lock_irq(&uport->lock); 171200de977fSJohan Hovold buf = state->xmit.buf; 171300de977fSJohan Hovold state->xmit.buf = NULL; 171400de977fSJohan Hovold spin_unlock_irq(&uport->lock); 1715ab4382d2SGreg Kroah-Hartman 171600de977fSJohan Hovold free_page((unsigned long)buf); 171700de977fSJohan Hovold 171800de977fSJohan Hovold uart_change_pm(state, UART_PM_STATE_OFF); 1719ab4382d2SGreg Kroah-Hartman } 1720ab4382d2SGreg Kroah-Hartman 17211f33a51dSJiri Slaby static void uart_wait_until_sent(struct tty_struct *tty, int timeout) 1722ab4382d2SGreg Kroah-Hartman { 17231f33a51dSJiri Slaby struct uart_state *state = tty->driver_data; 17249ed19428SPeter Hurley struct uart_port *port; 1725f9008285SIlpo Järvinen unsigned long char_time, expire, fifo_timeout; 1726ab4382d2SGreg Kroah-Hartman 17279ed19428SPeter Hurley port = uart_port_ref(state); 1728ef510beaSAndy Shevchenko if (!port) 1729ef510beaSAndy Shevchenko return; 1730ef510beaSAndy Shevchenko 1731ef510beaSAndy Shevchenko if (port->type == PORT_UNKNOWN || port->fifosize == 0) { 17329ed19428SPeter Hurley uart_port_deref(port); 1733ab4382d2SGreg Kroah-Hartman return; 17349ed19428SPeter Hurley } 1735ab4382d2SGreg Kroah-Hartman 1736ab4382d2SGreg Kroah-Hartman /* 1737ab4382d2SGreg Kroah-Hartman * Set the check interval to be 1/5 of the estimated time to 1738ab4382d2SGreg Kroah-Hartman * send a single character, and make it at least 1. The check 1739ab4382d2SGreg Kroah-Hartman * interval should also be less than the timeout. 1740ab4382d2SGreg Kroah-Hartman * 1741ab4382d2SGreg Kroah-Hartman * Note: we have to use pretty tight timings here to satisfy 1742ab4382d2SGreg Kroah-Hartman * the NIST-PCTS. 1743ab4382d2SGreg Kroah-Hartman */ 174431f6bd7fSIlpo Järvinen char_time = max(nsecs_to_jiffies(port->frame_time / 5), 1UL); 174531f6bd7fSIlpo Järvinen 1746ab4382d2SGreg Kroah-Hartman if (timeout && timeout < char_time) 1747ab4382d2SGreg Kroah-Hartman char_time = timeout; 1748ab4382d2SGreg Kroah-Hartman 1749b0e0bd9dSTomasz Moń if (!uart_cts_enabled(port)) { 1750ab4382d2SGreg Kroah-Hartman /* 1751ab4382d2SGreg Kroah-Hartman * If the transmitter hasn't cleared in twice the approximate 1752ab4382d2SGreg Kroah-Hartman * amount of time to send the entire FIFO, it probably won't 1753ab4382d2SGreg Kroah-Hartman * ever clear. This assumes the UART isn't doing flow 1754ab4382d2SGreg Kroah-Hartman * control, which is currently the case. Hence, if it ever 1755f9008285SIlpo Järvinen * takes longer than FIFO timeout, this is probably due to a 1756ab4382d2SGreg Kroah-Hartman * UART bug of some kind. So, we clamp the timeout parameter at 1757f9008285SIlpo Järvinen * 2 * FIFO timeout. 1758ab4382d2SGreg Kroah-Hartman */ 1759f9008285SIlpo Järvinen fifo_timeout = uart_fifo_timeout(port); 1760f9008285SIlpo Järvinen if (timeout == 0 || timeout > 2 * fifo_timeout) 1761f9008285SIlpo Järvinen timeout = 2 * fifo_timeout; 1762b0e0bd9dSTomasz Moń } 1763ab4382d2SGreg Kroah-Hartman 1764ab4382d2SGreg Kroah-Hartman expire = jiffies + timeout; 1765ab4382d2SGreg Kroah-Hartman 1766ab4382d2SGreg Kroah-Hartman pr_debug("uart_wait_until_sent(%d), jiffies=%lu, expire=%lu...\n", 1767ab4382d2SGreg Kroah-Hartman port->line, jiffies, expire); 1768ab4382d2SGreg Kroah-Hartman 1769ab4382d2SGreg Kroah-Hartman /* 1770ab4382d2SGreg Kroah-Hartman * Check whether the transmitter is empty every 'char_time'. 1771ab4382d2SGreg Kroah-Hartman * 'timeout' / 'expire' give us the maximum amount of time 1772ab4382d2SGreg Kroah-Hartman * we wait. 1773ab4382d2SGreg Kroah-Hartman */ 1774ab4382d2SGreg Kroah-Hartman while (!port->ops->tx_empty(port)) { 1775ab4382d2SGreg Kroah-Hartman msleep_interruptible(jiffies_to_msecs(char_time)); 1776ab4382d2SGreg Kroah-Hartman if (signal_pending(current)) 1777ab4382d2SGreg Kroah-Hartman break; 1778b0e0bd9dSTomasz Moń if (timeout && time_after(jiffies, expire)) 1779ab4382d2SGreg Kroah-Hartman break; 1780ab4382d2SGreg Kroah-Hartman } 17819ed19428SPeter Hurley uart_port_deref(port); 1782ab4382d2SGreg Kroah-Hartman } 1783ab4382d2SGreg Kroah-Hartman 1784ab4382d2SGreg Kroah-Hartman /* 1785ef4f527cSKevin Cernekee * Calls to uart_hangup() are serialised by the tty_lock in 1786ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:do_tty_hangup() 1787ef4f527cSKevin Cernekee * This runs from a workqueue and can sleep for a _short_ time only. 1788ab4382d2SGreg Kroah-Hartman */ 1789ab4382d2SGreg Kroah-Hartman static void uart_hangup(struct tty_struct *tty) 1790ab4382d2SGreg Kroah-Hartman { 1791ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1792ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1793af224ca2SPeter Hurley struct uart_port *uport; 1794ab4382d2SGreg Kroah-Hartman unsigned long flags; 1795ab4382d2SGreg Kroah-Hartman 179639b3d892SPeter Hurley pr_debug("uart_hangup(%d)\n", tty->index); 1797ab4382d2SGreg Kroah-Hartman 1798ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1799af224ca2SPeter Hurley uport = uart_port_check(state); 1800af224ca2SPeter Hurley WARN(!uport, "hangup of detached port!\n"); 1801af224ca2SPeter Hurley 1802807c8d81SPeter Hurley if (tty_port_active(port)) { 1803ab4382d2SGreg Kroah-Hartman uart_flush_buffer(tty); 1804ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 1805ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 1806ab4382d2SGreg Kroah-Hartman port->count = 0; 1807ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 1808807c8d81SPeter Hurley tty_port_set_active(port, 0); 1809ab4382d2SGreg Kroah-Hartman tty_port_tty_set(port, NULL); 1810af224ca2SPeter Hurley if (uport && !uart_console(uport)) 1811bf903c0cSGeert Uytterhoeven uart_change_pm(state, UART_PM_STATE_OFF); 1812ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->open_wait); 1813ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->delta_msr_wait); 1814ab4382d2SGreg Kroah-Hartman } 1815ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1816ab4382d2SGreg Kroah-Hartman } 1817ab4382d2SGreg Kroah-Hartman 1818af224ca2SPeter Hurley /* uport == NULL if uart_port has already been removed */ 18190b1db830SJiri Slaby static void uart_port_shutdown(struct tty_port *port) 18200b1db830SJiri Slaby { 1821b922e19dSJiri Slaby struct uart_state *state = container_of(port, struct uart_state, port); 18224047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 1823b922e19dSJiri Slaby 1824b922e19dSJiri Slaby /* 1825b922e19dSJiri Slaby * clear delta_msr_wait queue to avoid mem leaks: we may free 1826b922e19dSJiri Slaby * the irq here so the queue might never be woken up. Note 1827b922e19dSJiri Slaby * that we won't end up waiting on delta_msr_wait again since 1828b922e19dSJiri Slaby * any outstanding file descriptors should be pointing at 1829b922e19dSJiri Slaby * hung_up_tty_fops now. 1830b922e19dSJiri Slaby */ 1831b922e19dSJiri Slaby wake_up_interruptible(&port->delta_msr_wait); 1832b922e19dSJiri Slaby 18332765852eSJiri Slaby if (uport) { 18342765852eSJiri Slaby /* Free the IRQ and disable the port. */ 1835b922e19dSJiri Slaby uport->ops->shutdown(uport); 1836b922e19dSJiri Slaby 18372765852eSJiri Slaby /* Ensure that the IRQ handler isn't running on another CPU. */ 1838b922e19dSJiri Slaby synchronize_irq(uport->irq); 18390b1db830SJiri Slaby } 18402765852eSJiri Slaby } 18410b1db830SJiri Slaby 1842ab4382d2SGreg Kroah-Hartman static int uart_carrier_raised(struct tty_port *port) 1843ab4382d2SGreg Kroah-Hartman { 1844ab4382d2SGreg Kroah-Hartman struct uart_state *state = container_of(port, struct uart_state, port); 18459ed19428SPeter Hurley struct uart_port *uport; 1846ab4382d2SGreg Kroah-Hartman int mctrl; 18479ed19428SPeter Hurley 18489ed19428SPeter Hurley uport = uart_port_ref(state); 18499ed19428SPeter Hurley /* 18509ed19428SPeter Hurley * Should never observe uport == NULL since checks for hangup should 18519ed19428SPeter Hurley * abort the tty_port_block_til_ready() loop before checking for carrier 18529ed19428SPeter Hurley * raised -- but report carrier raised if it does anyway so open will 18539ed19428SPeter Hurley * continue and not sleep 18549ed19428SPeter Hurley */ 18559ed19428SPeter Hurley if (WARN_ON(!uport)) 18569ed19428SPeter Hurley return 1; 1857ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 18581fdc3106SAlexander Shiyan uart_enable_ms(uport); 1859ab4382d2SGreg Kroah-Hartman mctrl = uport->ops->get_mctrl(uport); 1860ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 18619ed19428SPeter Hurley uart_port_deref(uport); 1862ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_CAR) 1863ab4382d2SGreg Kroah-Hartman return 1; 1864ab4382d2SGreg Kroah-Hartman return 0; 1865ab4382d2SGreg Kroah-Hartman } 1866ab4382d2SGreg Kroah-Hartman 1867a6845e1eSRafael Gago static void uart_dtr_rts(struct tty_port *port, int raise) 1868ab4382d2SGreg Kroah-Hartman { 1869ab4382d2SGreg Kroah-Hartman struct uart_state *state = container_of(port, struct uart_state, port); 18709ed19428SPeter Hurley struct uart_port *uport; 18719ed19428SPeter Hurley 18729ed19428SPeter Hurley uport = uart_port_ref(state); 18739ed19428SPeter Hurley if (!uport) 18749ed19428SPeter Hurley return; 1875a6845e1eSRafael Gago uart_port_dtr_rts(uport, raise); 18769ed19428SPeter Hurley uart_port_deref(uport); 1877ab4382d2SGreg Kroah-Hartman } 1878ab4382d2SGreg Kroah-Hartman 18794cdd17baSJiri Slaby static int uart_install(struct tty_driver *driver, struct tty_struct *tty) 18804cdd17baSJiri Slaby { 18814cdd17baSJiri Slaby struct uart_driver *drv = driver->driver_state; 18824cdd17baSJiri Slaby struct uart_state *state = drv->state + tty->index; 18834cdd17baSJiri Slaby 18844cdd17baSJiri Slaby tty->driver_data = state; 18854cdd17baSJiri Slaby 18864cdd17baSJiri Slaby return tty_standard_install(driver, tty); 18874cdd17baSJiri Slaby } 18884cdd17baSJiri Slaby 1889ab4382d2SGreg Kroah-Hartman /* 1890ef4f527cSKevin Cernekee * Calls to uart_open are serialised by the tty_lock in 1891ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:tty_open() 1892ab4382d2SGreg Kroah-Hartman * Note that if this fails, then uart_close() _will_ be called. 1893ab4382d2SGreg Kroah-Hartman * 1894ab4382d2SGreg Kroah-Hartman * In time, we want to scrap the "opening nonpresent ports" 1895ab4382d2SGreg Kroah-Hartman * behaviour and implement an alternative way for setserial 1896ab4382d2SGreg Kroah-Hartman * to set base addresses/ports/types. This will allow us to 1897ab4382d2SGreg Kroah-Hartman * get rid of a certain amount of extra tests. 1898ab4382d2SGreg Kroah-Hartman */ 1899ab4382d2SGreg Kroah-Hartman static int uart_open(struct tty_struct *tty, struct file *filp) 1900ab4382d2SGreg Kroah-Hartman { 19014cdd17baSJiri Slaby struct uart_state *state = tty->driver_data; 19024cdd17baSJiri Slaby int retval; 1903b3b57646SRob Herring 1904b3b57646SRob Herring retval = tty_port_open(&state->port, tty, filp); 1905b3b57646SRob Herring if (retval > 0) 1906b3b57646SRob Herring retval = 0; 1907b3b57646SRob Herring 1908b3b57646SRob Herring return retval; 1909b3b57646SRob Herring } 1910b3b57646SRob Herring 1911b3b57646SRob Herring static int uart_port_activate(struct tty_port *port, struct tty_struct *tty) 1912b3b57646SRob Herring { 1913b3b57646SRob Herring struct uart_state *state = container_of(port, struct uart_state, port); 1914b3b57646SRob Herring struct uart_port *uport; 191513b18d35SSerge Semin int ret; 1916b3b57646SRob Herring 1917b3b57646SRob Herring uport = uart_port_check(state); 1918b3b57646SRob Herring if (!uport || uport->flags & UPF_DEAD) 1919b3b57646SRob Herring return -ENXIO; 1920b3b57646SRob Herring 1921ab4382d2SGreg Kroah-Hartman /* 1922ab4382d2SGreg Kroah-Hartman * Start up the serial port. 1923ab4382d2SGreg Kroah-Hartman */ 192413b18d35SSerge Semin ret = uart_startup(tty, state, 0); 192513b18d35SSerge Semin if (ret > 0) 192613b18d35SSerge Semin tty_port_set_active(port, 1); 192713b18d35SSerge Semin 192813b18d35SSerge Semin return ret; 1929ab4382d2SGreg Kroah-Hartman } 1930ab4382d2SGreg Kroah-Hartman 1931ab4382d2SGreg Kroah-Hartman static const char *uart_type(struct uart_port *port) 1932ab4382d2SGreg Kroah-Hartman { 1933ab4382d2SGreg Kroah-Hartman const char *str = NULL; 1934ab4382d2SGreg Kroah-Hartman 1935ab4382d2SGreg Kroah-Hartman if (port->ops->type) 1936ab4382d2SGreg Kroah-Hartman str = port->ops->type(port); 1937ab4382d2SGreg Kroah-Hartman 1938ab4382d2SGreg Kroah-Hartman if (!str) 1939ab4382d2SGreg Kroah-Hartman str = "unknown"; 1940ab4382d2SGreg Kroah-Hartman 1941ab4382d2SGreg Kroah-Hartman return str; 1942ab4382d2SGreg Kroah-Hartman } 1943ab4382d2SGreg Kroah-Hartman 1944ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_PROC_FS 1945ab4382d2SGreg Kroah-Hartman 1946ab4382d2SGreg Kroah-Hartman static void uart_line_info(struct seq_file *m, struct uart_driver *drv, int i) 1947ab4382d2SGreg Kroah-Hartman { 1948ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + i; 1949ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 19506f538fe3SLinus Walleij enum uart_pm_state pm_state; 19514047b371SPeter Hurley struct uart_port *uport; 1952ab4382d2SGreg Kroah-Hartman char stat_buf[32]; 1953ab4382d2SGreg Kroah-Hartman unsigned int status; 1954ab4382d2SGreg Kroah-Hartman int mmio; 1955ab4382d2SGreg Kroah-Hartman 19564047b371SPeter Hurley mutex_lock(&port->mutex); 19574047b371SPeter Hurley uport = uart_port_check(state); 1958ab4382d2SGreg Kroah-Hartman if (!uport) 19594047b371SPeter Hurley goto out; 1960ab4382d2SGreg Kroah-Hartman 1961ab4382d2SGreg Kroah-Hartman mmio = uport->iotype >= UPIO_MEM; 1962ab4382d2SGreg Kroah-Hartman seq_printf(m, "%d: uart:%s %s%08llX irq:%d", 1963ab4382d2SGreg Kroah-Hartman uport->line, uart_type(uport), 1964ab4382d2SGreg Kroah-Hartman mmio ? "mmio:0x" : "port:", 1965ab4382d2SGreg Kroah-Hartman mmio ? (unsigned long long)uport->mapbase 1966ab4382d2SGreg Kroah-Hartman : (unsigned long long)uport->iobase, 1967ab4382d2SGreg Kroah-Hartman uport->irq); 1968ab4382d2SGreg Kroah-Hartman 1969ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) { 1970ab4382d2SGreg Kroah-Hartman seq_putc(m, '\n'); 19714047b371SPeter Hurley goto out; 1972ab4382d2SGreg Kroah-Hartman } 1973ab4382d2SGreg Kroah-Hartman 1974ab4382d2SGreg Kroah-Hartman if (capable(CAP_SYS_ADMIN)) { 1975ab4382d2SGreg Kroah-Hartman pm_state = state->pm_state; 19766f538fe3SLinus Walleij if (pm_state != UART_PM_STATE_ON) 19776f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 1978ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1979ab4382d2SGreg Kroah-Hartman status = uport->ops->get_mctrl(uport); 1980ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 19816f538fe3SLinus Walleij if (pm_state != UART_PM_STATE_ON) 1982ab4382d2SGreg Kroah-Hartman uart_change_pm(state, pm_state); 1983ab4382d2SGreg Kroah-Hartman 1984ab4382d2SGreg Kroah-Hartman seq_printf(m, " tx:%d rx:%d", 1985ab4382d2SGreg Kroah-Hartman uport->icount.tx, uport->icount.rx); 1986ab4382d2SGreg Kroah-Hartman if (uport->icount.frame) 1987968af298SPeter Hurley seq_printf(m, " fe:%d", uport->icount.frame); 1988ab4382d2SGreg Kroah-Hartman if (uport->icount.parity) 1989968af298SPeter Hurley seq_printf(m, " pe:%d", uport->icount.parity); 1990ab4382d2SGreg Kroah-Hartman if (uport->icount.brk) 1991968af298SPeter Hurley seq_printf(m, " brk:%d", uport->icount.brk); 1992ab4382d2SGreg Kroah-Hartman if (uport->icount.overrun) 1993968af298SPeter Hurley seq_printf(m, " oe:%d", uport->icount.overrun); 19944f794097SJeremy Kerr if (uport->icount.buf_overrun) 19954f794097SJeremy Kerr seq_printf(m, " bo:%d", uport->icount.buf_overrun); 1996ab4382d2SGreg Kroah-Hartman 1997ab4382d2SGreg Kroah-Hartman #define INFOBIT(bit, str) \ 1998ab4382d2SGreg Kroah-Hartman if (uport->mctrl & (bit)) \ 1999ab4382d2SGreg Kroah-Hartman strncat(stat_buf, (str), sizeof(stat_buf) - \ 2000ab4382d2SGreg Kroah-Hartman strlen(stat_buf) - 2) 2001ab4382d2SGreg Kroah-Hartman #define STATBIT(bit, str) \ 2002ab4382d2SGreg Kroah-Hartman if (status & (bit)) \ 2003ab4382d2SGreg Kroah-Hartman strncat(stat_buf, (str), sizeof(stat_buf) - \ 2004ab4382d2SGreg Kroah-Hartman strlen(stat_buf) - 2) 2005ab4382d2SGreg Kroah-Hartman 2006ab4382d2SGreg Kroah-Hartman stat_buf[0] = '\0'; 2007ab4382d2SGreg Kroah-Hartman stat_buf[1] = '\0'; 2008ab4382d2SGreg Kroah-Hartman INFOBIT(TIOCM_RTS, "|RTS"); 2009ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_CTS, "|CTS"); 2010ab4382d2SGreg Kroah-Hartman INFOBIT(TIOCM_DTR, "|DTR"); 2011ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_DSR, "|DSR"); 2012ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_CAR, "|CD"); 2013ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_RNG, "|RI"); 2014ab4382d2SGreg Kroah-Hartman if (stat_buf[0]) 2015ab4382d2SGreg Kroah-Hartman stat_buf[0] = ' '; 2016ab4382d2SGreg Kroah-Hartman 2017ab4382d2SGreg Kroah-Hartman seq_puts(m, stat_buf); 2018ab4382d2SGreg Kroah-Hartman } 2019ab4382d2SGreg Kroah-Hartman seq_putc(m, '\n'); 2020ab4382d2SGreg Kroah-Hartman #undef STATBIT 2021ab4382d2SGreg Kroah-Hartman #undef INFOBIT 20224047b371SPeter Hurley out: 20234047b371SPeter Hurley mutex_unlock(&port->mutex); 2024ab4382d2SGreg Kroah-Hartman } 2025ab4382d2SGreg Kroah-Hartman 2026ab4382d2SGreg Kroah-Hartman static int uart_proc_show(struct seq_file *m, void *v) 2027ab4382d2SGreg Kroah-Hartman { 2028ab4382d2SGreg Kroah-Hartman struct tty_driver *ttydrv = m->private; 2029ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = ttydrv->driver_state; 2030ab4382d2SGreg Kroah-Hartman int i; 2031ab4382d2SGreg Kroah-Hartman 2032968af298SPeter Hurley seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n", "", "", ""); 2033ab4382d2SGreg Kroah-Hartman for (i = 0; i < drv->nr; i++) 2034ab4382d2SGreg Kroah-Hartman uart_line_info(m, drv, i); 2035ab4382d2SGreg Kroah-Hartman return 0; 2036ab4382d2SGreg Kroah-Hartman } 2037ab4382d2SGreg Kroah-Hartman #endif 2038ab4382d2SGreg Kroah-Hartman 20397a49955aSAndy Shevchenko static inline bool uart_console_enabled(struct uart_port *port) 20407a49955aSAndy Shevchenko { 20417a49955aSAndy Shevchenko return uart_console(port) && (port->cons->flags & CON_ENABLED); 20427a49955aSAndy Shevchenko } 20437a49955aSAndy Shevchenko 2044e0830dbfSJohan Hovold static void uart_port_spin_lock_init(struct uart_port *port) 2045f743061aSAndy Shevchenko { 2046f743061aSAndy Shevchenko spin_lock_init(&port->lock); 2047f743061aSAndy Shevchenko lockdep_set_class(&port->lock, &port_lock_key); 2048f743061aSAndy Shevchenko } 2049f743061aSAndy Shevchenko 2050ab4382d2SGreg Kroah-Hartman #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL) 20511cfe42b7SPeter Hurley /** 2052ab4382d2SGreg Kroah-Hartman * uart_console_write - write a console message to a serial port 2053ab4382d2SGreg Kroah-Hartman * @port: the port to write the message 2054ab4382d2SGreg Kroah-Hartman * @s: array of characters 2055ab4382d2SGreg Kroah-Hartman * @count: number of characters in string to write 205610afbe34SPeter Hurley * @putchar: function to write character to port 2057ab4382d2SGreg Kroah-Hartman */ 2058ab4382d2SGreg Kroah-Hartman void uart_console_write(struct uart_port *port, const char *s, 2059ab4382d2SGreg Kroah-Hartman unsigned int count, 20603f8bab17SJiri Slaby void (*putchar)(struct uart_port *, unsigned char)) 2061ab4382d2SGreg Kroah-Hartman { 2062ab4382d2SGreg Kroah-Hartman unsigned int i; 2063ab4382d2SGreg Kroah-Hartman 2064ab4382d2SGreg Kroah-Hartman for (i = 0; i < count; i++, s++) { 2065ab4382d2SGreg Kroah-Hartman if (*s == '\n') 2066ab4382d2SGreg Kroah-Hartman putchar(port, '\r'); 2067ab4382d2SGreg Kroah-Hartman putchar(port, *s); 2068ab4382d2SGreg Kroah-Hartman } 2069ab4382d2SGreg Kroah-Hartman } 2070ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_console_write); 2071ab4382d2SGreg Kroah-Hartman 2072ab4382d2SGreg Kroah-Hartman /* 2073ab4382d2SGreg Kroah-Hartman * Check whether an invalid uart number has been specified, and 2074ab4382d2SGreg Kroah-Hartman * if so, search for the first available port that does have 2075ab4382d2SGreg Kroah-Hartman * console support. 2076ab4382d2SGreg Kroah-Hartman */ 2077ab4382d2SGreg Kroah-Hartman struct uart_port * __init 2078ab4382d2SGreg Kroah-Hartman uart_get_console(struct uart_port *ports, int nr, struct console *co) 2079ab4382d2SGreg Kroah-Hartman { 2080ab4382d2SGreg Kroah-Hartman int idx = co->index; 2081ab4382d2SGreg Kroah-Hartman 2082ab4382d2SGreg Kroah-Hartman if (idx < 0 || idx >= nr || (ports[idx].iobase == 0 && 2083ab4382d2SGreg Kroah-Hartman ports[idx].membase == NULL)) 2084ab4382d2SGreg Kroah-Hartman for (idx = 0; idx < nr; idx++) 2085ab4382d2SGreg Kroah-Hartman if (ports[idx].iobase != 0 || 2086ab4382d2SGreg Kroah-Hartman ports[idx].membase != NULL) 2087ab4382d2SGreg Kroah-Hartman break; 2088ab4382d2SGreg Kroah-Hartman 2089ab4382d2SGreg Kroah-Hartman co->index = idx; 2090ab4382d2SGreg Kroah-Hartman 2091ab4382d2SGreg Kroah-Hartman return ports + idx; 2092ab4382d2SGreg Kroah-Hartman } 2093ab4382d2SGreg Kroah-Hartman 2094ab4382d2SGreg Kroah-Hartman /** 209573abaf87SPeter Hurley * uart_parse_earlycon - Parse earlycon options 209673abaf87SPeter Hurley * @p: ptr to 2nd field (ie., just beyond '<name>,') 209773abaf87SPeter Hurley * @iotype: ptr for decoded iotype (out) 209873abaf87SPeter Hurley * @addr: ptr for decoded mapbase/iobase (out) 209973abaf87SPeter Hurley * @options: ptr for <options> field; NULL if not present (out) 210073abaf87SPeter Hurley * 210173abaf87SPeter Hurley * Decodes earlycon kernel command line parameters of the form 2102bd94c407SMasahiro Yamada * earlycon=<name>,io|mmio|mmio16|mmio32|mmio32be|mmio32native,<addr>,<options> 2103bd94c407SMasahiro Yamada * console=<name>,io|mmio|mmio16|mmio32|mmio32be|mmio32native,<addr>,<options> 210473abaf87SPeter Hurley * 210573abaf87SPeter Hurley * The optional form 2106ff30283aSRandy Dunlap * 210773abaf87SPeter Hurley * earlycon=<name>,0x<addr>,<options> 210873abaf87SPeter Hurley * console=<name>,0x<addr>,<options> 2109ff30283aSRandy Dunlap * 211073abaf87SPeter Hurley * is also accepted; the returned @iotype will be UPIO_MEM. 211173abaf87SPeter Hurley * 21128b2303deSAlexander Sverdlin * Returns 0 on success or -EINVAL on failure 211373abaf87SPeter Hurley */ 211446e36683SAlexander Sverdlin int uart_parse_earlycon(char *p, unsigned char *iotype, resource_size_t *addr, 211573abaf87SPeter Hurley char **options) 211673abaf87SPeter Hurley { 211773abaf87SPeter Hurley if (strncmp(p, "mmio,", 5) == 0) { 211873abaf87SPeter Hurley *iotype = UPIO_MEM; 211973abaf87SPeter Hurley p += 5; 2120bd94c407SMasahiro Yamada } else if (strncmp(p, "mmio16,", 7) == 0) { 2121bd94c407SMasahiro Yamada *iotype = UPIO_MEM16; 2122bd94c407SMasahiro Yamada p += 7; 212373abaf87SPeter Hurley } else if (strncmp(p, "mmio32,", 7) == 0) { 212473abaf87SPeter Hurley *iotype = UPIO_MEM32; 212573abaf87SPeter Hurley p += 7; 21266e63be3fSNoam Camus } else if (strncmp(p, "mmio32be,", 9) == 0) { 21276e63be3fSNoam Camus *iotype = UPIO_MEM32BE; 21286e63be3fSNoam Camus p += 9; 2129d215d809SMax Filippov } else if (strncmp(p, "mmio32native,", 13) == 0) { 2130d215d809SMax Filippov *iotype = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) ? 2131d215d809SMax Filippov UPIO_MEM32BE : UPIO_MEM32; 2132d215d809SMax Filippov p += 13; 213373abaf87SPeter Hurley } else if (strncmp(p, "io,", 3) == 0) { 213473abaf87SPeter Hurley *iotype = UPIO_PORT; 213573abaf87SPeter Hurley p += 3; 213673abaf87SPeter Hurley } else if (strncmp(p, "0x", 2) == 0) { 213773abaf87SPeter Hurley *iotype = UPIO_MEM; 213873abaf87SPeter Hurley } else { 213973abaf87SPeter Hurley return -EINVAL; 214073abaf87SPeter Hurley } 214173abaf87SPeter Hurley 21428b2303deSAlexander Sverdlin /* 21438b2303deSAlexander Sverdlin * Before you replace it with kstrtoull(), think about options separator 21448b2303deSAlexander Sverdlin * (',') it will not tolerate 21458b2303deSAlexander Sverdlin */ 21468b2303deSAlexander Sverdlin *addr = simple_strtoull(p, NULL, 0); 214773abaf87SPeter Hurley p = strchr(p, ','); 214873abaf87SPeter Hurley if (p) 214973abaf87SPeter Hurley p++; 215073abaf87SPeter Hurley 215173abaf87SPeter Hurley *options = p; 215273abaf87SPeter Hurley return 0; 215373abaf87SPeter Hurley } 215473abaf87SPeter Hurley EXPORT_SYMBOL_GPL(uart_parse_earlycon); 215573abaf87SPeter Hurley 215673abaf87SPeter Hurley /** 215702088ca6SGeert Uytterhoeven * uart_parse_options - Parse serial port baud/parity/bits/flow control. 2158ab4382d2SGreg Kroah-Hartman * @options: pointer to option string 2159ab4382d2SGreg Kroah-Hartman * @baud: pointer to an 'int' variable for the baud rate. 2160ab4382d2SGreg Kroah-Hartman * @parity: pointer to an 'int' variable for the parity. 2161ab4382d2SGreg Kroah-Hartman * @bits: pointer to an 'int' variable for the number of data bits. 2162ab4382d2SGreg Kroah-Hartman * @flow: pointer to an 'int' variable for the flow control character. 2163ab4382d2SGreg Kroah-Hartman * 2164ab4382d2SGreg Kroah-Hartman * uart_parse_options decodes a string containing the serial console 2165ab4382d2SGreg Kroah-Hartman * options. The format of the string is <baud><parity><bits><flow>, 2166ab4382d2SGreg Kroah-Hartman * eg: 115200n8r 2167ab4382d2SGreg Kroah-Hartman */ 2168ab4382d2SGreg Kroah-Hartman void 21690f646b63SPaul Cercueil uart_parse_options(const char *options, int *baud, int *parity, 21700f646b63SPaul Cercueil int *bits, int *flow) 2171ab4382d2SGreg Kroah-Hartman { 21720f646b63SPaul Cercueil const char *s = options; 2173ab4382d2SGreg Kroah-Hartman 2174ab4382d2SGreg Kroah-Hartman *baud = simple_strtoul(s, NULL, 10); 2175ab4382d2SGreg Kroah-Hartman while (*s >= '0' && *s <= '9') 2176ab4382d2SGreg Kroah-Hartman s++; 2177ab4382d2SGreg Kroah-Hartman if (*s) 2178ab4382d2SGreg Kroah-Hartman *parity = *s++; 2179ab4382d2SGreg Kroah-Hartman if (*s) 2180ab4382d2SGreg Kroah-Hartman *bits = *s++ - '0'; 2181ab4382d2SGreg Kroah-Hartman if (*s) 2182ab4382d2SGreg Kroah-Hartman *flow = *s; 2183ab4382d2SGreg Kroah-Hartman } 2184ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_parse_options); 2185ab4382d2SGreg Kroah-Hartman 2186ab4382d2SGreg Kroah-Hartman /** 2187ab4382d2SGreg Kroah-Hartman * uart_set_options - setup the serial console parameters 2188ab4382d2SGreg Kroah-Hartman * @port: pointer to the serial ports uart_port structure 2189ab4382d2SGreg Kroah-Hartman * @co: console pointer 2190ab4382d2SGreg Kroah-Hartman * @baud: baud rate 2191ab4382d2SGreg Kroah-Hartman * @parity: parity character - 'n' (none), 'o' (odd), 'e' (even) 2192ab4382d2SGreg Kroah-Hartman * @bits: number of data bits 2193ab4382d2SGreg Kroah-Hartman * @flow: flow control character - 'r' (rts) 2194ab4382d2SGreg Kroah-Hartman */ 2195ab4382d2SGreg Kroah-Hartman int 2196ab4382d2SGreg Kroah-Hartman uart_set_options(struct uart_port *port, struct console *co, 2197ab4382d2SGreg Kroah-Hartman int baud, int parity, int bits, int flow) 2198ab4382d2SGreg Kroah-Hartman { 2199ab4382d2SGreg Kroah-Hartman struct ktermios termios; 2200ab4382d2SGreg Kroah-Hartman static struct ktermios dummy; 2201ab4382d2SGreg Kroah-Hartman 2202e0830dbfSJohan Hovold /* 2203e0830dbfSJohan Hovold * Ensure that the serial-console lock is initialised early. 2204e0830dbfSJohan Hovold * 2205e0830dbfSJohan Hovold * Note that the console-enabled check is needed because of kgdboc, 2206e0830dbfSJohan Hovold * which can end up calling uart_set_options() for an already enabled 2207e0830dbfSJohan Hovold * console via tty_find_polling_driver() and uart_poll_init(). 2208e0830dbfSJohan Hovold */ 2209e0830dbfSJohan Hovold if (!uart_console_enabled(port) && !port->console_reinit) 2210d2403cadSAndy Shevchenko uart_port_spin_lock_init(port); 2211ab4382d2SGreg Kroah-Hartman 2212ab4382d2SGreg Kroah-Hartman memset(&termios, 0, sizeof(struct ktermios)); 2213ab4382d2SGreg Kroah-Hartman 2214ba47f97aSJeffy Chen termios.c_cflag |= CREAD | HUPCL | CLOCAL; 2215ba47f97aSJeffy Chen tty_termios_encode_baud_rate(&termios, baud, baud); 2216ab4382d2SGreg Kroah-Hartman 2217ab4382d2SGreg Kroah-Hartman if (bits == 7) 2218ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CS7; 2219ab4382d2SGreg Kroah-Hartman else 2220ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CS8; 2221ab4382d2SGreg Kroah-Hartman 2222ab4382d2SGreg Kroah-Hartman switch (parity) { 2223ab4382d2SGreg Kroah-Hartman case 'o': case 'O': 2224ab4382d2SGreg Kroah-Hartman termios.c_cflag |= PARODD; 2225df561f66SGustavo A. R. Silva fallthrough; 2226ab4382d2SGreg Kroah-Hartman case 'e': case 'E': 2227ab4382d2SGreg Kroah-Hartman termios.c_cflag |= PARENB; 2228ab4382d2SGreg Kroah-Hartman break; 2229ab4382d2SGreg Kroah-Hartman } 2230ab4382d2SGreg Kroah-Hartman 2231ab4382d2SGreg Kroah-Hartman if (flow == 'r') 2232ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CRTSCTS; 2233ab4382d2SGreg Kroah-Hartman 2234ab4382d2SGreg Kroah-Hartman /* 2235ab4382d2SGreg Kroah-Hartman * some uarts on other side don't support no flow control. 2236ab4382d2SGreg Kroah-Hartman * So we set * DTR in host uart to make them happy 2237ab4382d2SGreg Kroah-Hartman */ 2238ab4382d2SGreg Kroah-Hartman port->mctrl |= TIOCM_DTR; 2239ab4382d2SGreg Kroah-Hartman 2240ab4382d2SGreg Kroah-Hartman port->ops->set_termios(port, &termios, &dummy); 2241ab4382d2SGreg Kroah-Hartman /* 2242ab4382d2SGreg Kroah-Hartman * Allow the setting of the UART parameters with a NULL console 2243ab4382d2SGreg Kroah-Hartman * too: 2244ab4382d2SGreg Kroah-Hartman */ 2245027b5717SPali Rohár if (co) { 2246ab4382d2SGreg Kroah-Hartman co->cflag = termios.c_cflag; 2247027b5717SPali Rohár co->ispeed = termios.c_ispeed; 2248027b5717SPali Rohár co->ospeed = termios.c_ospeed; 2249027b5717SPali Rohár } 2250ab4382d2SGreg Kroah-Hartman 2251ab4382d2SGreg Kroah-Hartman return 0; 2252ab4382d2SGreg Kroah-Hartman } 2253ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_set_options); 2254ab4382d2SGreg Kroah-Hartman #endif /* CONFIG_SERIAL_CORE_CONSOLE */ 2255ab4382d2SGreg Kroah-Hartman 2256cf75525fSJiri Slaby /** 2257cf75525fSJiri Slaby * uart_change_pm - set power state of the port 2258cf75525fSJiri Slaby * 2259cf75525fSJiri Slaby * @state: port descriptor 2260cf75525fSJiri Slaby * @pm_state: new state 2261cf75525fSJiri Slaby * 2262cf75525fSJiri Slaby * Locking: port->mutex has to be held 2263cf75525fSJiri Slaby */ 22646f538fe3SLinus Walleij static void uart_change_pm(struct uart_state *state, 22656f538fe3SLinus Walleij enum uart_pm_state pm_state) 2266ab4382d2SGreg Kroah-Hartman { 22674047b371SPeter Hurley struct uart_port *port = uart_port_check(state); 2268ab4382d2SGreg Kroah-Hartman 2269ab4382d2SGreg Kroah-Hartman if (state->pm_state != pm_state) { 22704047b371SPeter Hurley if (port && port->ops->pm) 2271ab4382d2SGreg Kroah-Hartman port->ops->pm(port, pm_state, state->pm_state); 2272ab4382d2SGreg Kroah-Hartman state->pm_state = pm_state; 2273ab4382d2SGreg Kroah-Hartman } 2274ab4382d2SGreg Kroah-Hartman } 2275ab4382d2SGreg Kroah-Hartman 2276ab4382d2SGreg Kroah-Hartman struct uart_match { 2277ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2278ab4382d2SGreg Kroah-Hartman struct uart_driver *driver; 2279ab4382d2SGreg Kroah-Hartman }; 2280ab4382d2SGreg Kroah-Hartman 2281ab4382d2SGreg Kroah-Hartman static int serial_match_port(struct device *dev, void *data) 2282ab4382d2SGreg Kroah-Hartman { 2283ab4382d2SGreg Kroah-Hartman struct uart_match *match = data; 2284ab4382d2SGreg Kroah-Hartman struct tty_driver *tty_drv = match->driver->tty_driver; 2285ab4382d2SGreg Kroah-Hartman dev_t devt = MKDEV(tty_drv->major, tty_drv->minor_start) + 2286ab4382d2SGreg Kroah-Hartman match->port->line; 2287ab4382d2SGreg Kroah-Hartman 2288ab4382d2SGreg Kroah-Hartman return dev->devt == devt; /* Actually, only one tty per port */ 2289ab4382d2SGreg Kroah-Hartman } 2290ab4382d2SGreg Kroah-Hartman 2291ab4382d2SGreg Kroah-Hartman int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport) 2292ab4382d2SGreg Kroah-Hartman { 2293ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 2294ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2295ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 2296ab4382d2SGreg Kroah-Hartman struct uart_match match = {uport, drv}; 2297ab4382d2SGreg Kroah-Hartman 2298ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2299ab4382d2SGreg Kroah-Hartman 2300ab4382d2SGreg Kroah-Hartman tty_dev = device_find_child(uport->dev, &match, serial_match_port); 230188e2582eSLucas Stach if (tty_dev && device_may_wakeup(tty_dev)) { 2302aef3ad10SAndy Shevchenko enable_irq_wake(uport->irq); 2303ab4382d2SGreg Kroah-Hartman put_device(tty_dev); 2304ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2305ab4382d2SGreg Kroah-Hartman return 0; 2306ab4382d2SGreg Kroah-Hartman } 23075a65dcc0SFederico Vaga put_device(tty_dev); 23085a65dcc0SFederico Vaga 2309c9d2325cSVijaya Krishna Nivarthi /* 2310c9d2325cSVijaya Krishna Nivarthi * Nothing to do if the console is not suspending 2311c9d2325cSVijaya Krishna Nivarthi * except stop_rx to prevent any asynchronous data 2312cfab87c2SVijaya Krishna Nivarthi * over RX line. However ensure that we will be 2313cfab87c2SVijaya Krishna Nivarthi * able to Re-start_rx later. 2314c9d2325cSVijaya Krishna Nivarthi */ 2315c9d2325cSVijaya Krishna Nivarthi if (!console_suspend_enabled && uart_console(uport)) { 2316cfab87c2SVijaya Krishna Nivarthi if (uport->ops->start_rx) 2317c9d2325cSVijaya Krishna Nivarthi uport->ops->stop_rx(uport); 2318b164c972SPeter Hurley goto unlock; 2319c9d2325cSVijaya Krishna Nivarthi } 2320b164c972SPeter Hurley 2321ab4382d2SGreg Kroah-Hartman uport->suspended = 1; 2322ab4382d2SGreg Kroah-Hartman 2323d41861caSPeter Hurley if (tty_port_initialized(port)) { 2324ab4382d2SGreg Kroah-Hartman const struct uart_ops *ops = uport->ops; 2325ab4382d2SGreg Kroah-Hartman int tries; 232618c9d4a3SAl Cooper unsigned int mctrl; 2327ab4382d2SGreg Kroah-Hartman 232880f02d54SPeter Hurley tty_port_set_suspended(port, 1); 2329d41861caSPeter Hurley tty_port_set_initialized(port, 0); 2330ab4382d2SGreg Kroah-Hartman 2331ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 2332ab4382d2SGreg Kroah-Hartman ops->stop_tx(uport); 2333ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, 0); 233418c9d4a3SAl Cooper /* save mctrl so it can be restored on resume */ 233518c9d4a3SAl Cooper mctrl = uport->mctrl; 233618c9d4a3SAl Cooper uport->mctrl = 0; 2337ab4382d2SGreg Kroah-Hartman ops->stop_rx(uport); 2338ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2339ab4382d2SGreg Kroah-Hartman 2340ab4382d2SGreg Kroah-Hartman /* 2341ab4382d2SGreg Kroah-Hartman * Wait for the transmitter to empty. 2342ab4382d2SGreg Kroah-Hartman */ 2343ab4382d2SGreg Kroah-Hartman for (tries = 3; !ops->tx_empty(uport) && tries; tries--) 2344ab4382d2SGreg Kroah-Hartman msleep(10); 2345ab4382d2SGreg Kroah-Hartman if (!tries) 2346cade3580SAndy Shevchenko dev_err(uport->dev, "%s: Unable to drain transmitter\n", 2347cade3580SAndy Shevchenko uport->name); 2348ab4382d2SGreg Kroah-Hartman 2349ab4382d2SGreg Kroah-Hartman ops->shutdown(uport); 235018c9d4a3SAl Cooper uport->mctrl = mctrl; 2351ab4382d2SGreg Kroah-Hartman } 2352ab4382d2SGreg Kroah-Hartman 2353ab4382d2SGreg Kroah-Hartman /* 2354ab4382d2SGreg Kroah-Hartman * Disable the console device before suspending. 2355ab4382d2SGreg Kroah-Hartman */ 2356b164c972SPeter Hurley if (uart_console(uport)) 2357ab4382d2SGreg Kroah-Hartman console_stop(uport->cons); 2358ab4382d2SGreg Kroah-Hartman 23596f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_OFF); 2360b164c972SPeter Hurley unlock: 2361ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2362ab4382d2SGreg Kroah-Hartman 2363ab4382d2SGreg Kroah-Hartman return 0; 2364ab4382d2SGreg Kroah-Hartman } 236515dc475bSJiri Slaby EXPORT_SYMBOL(uart_suspend_port); 2366ab4382d2SGreg Kroah-Hartman 2367ab4382d2SGreg Kroah-Hartman int uart_resume_port(struct uart_driver *drv, struct uart_port *uport) 2368ab4382d2SGreg Kroah-Hartman { 2369ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 2370ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2371ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 2372ab4382d2SGreg Kroah-Hartman struct uart_match match = {uport, drv}; 2373ab4382d2SGreg Kroah-Hartman struct ktermios termios; 2374ab4382d2SGreg Kroah-Hartman 2375ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2376ab4382d2SGreg Kroah-Hartman 2377ab4382d2SGreg Kroah-Hartman tty_dev = device_find_child(uport->dev, &match, serial_match_port); 2378ab4382d2SGreg Kroah-Hartman if (!uport->suspended && device_may_wakeup(tty_dev)) { 2379aef3ad10SAndy Shevchenko if (irqd_is_wakeup_set(irq_get_irq_data((uport->irq)))) 2380ab4382d2SGreg Kroah-Hartman disable_irq_wake(uport->irq); 23815a65dcc0SFederico Vaga put_device(tty_dev); 2382ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2383ab4382d2SGreg Kroah-Hartman return 0; 2384ab4382d2SGreg Kroah-Hartman } 23855a65dcc0SFederico Vaga put_device(tty_dev); 2386ab4382d2SGreg Kroah-Hartman uport->suspended = 0; 2387ab4382d2SGreg Kroah-Hartman 2388ab4382d2SGreg Kroah-Hartman /* 2389ab4382d2SGreg Kroah-Hartman * Re-enable the console device after suspending. 2390ab4382d2SGreg Kroah-Hartman */ 23915933a161SYin Kangkai if (uart_console(uport)) { 2392ab4382d2SGreg Kroah-Hartman /* 2393ab4382d2SGreg Kroah-Hartman * First try to use the console cflag setting. 2394ab4382d2SGreg Kroah-Hartman */ 2395ab4382d2SGreg Kroah-Hartman memset(&termios, 0, sizeof(struct ktermios)); 2396ab4382d2SGreg Kroah-Hartman termios.c_cflag = uport->cons->cflag; 2397027b5717SPali Rohár termios.c_ispeed = uport->cons->ispeed; 2398027b5717SPali Rohár termios.c_ospeed = uport->cons->ospeed; 2399ab4382d2SGreg Kroah-Hartman 2400ab4382d2SGreg Kroah-Hartman /* 2401ab4382d2SGreg Kroah-Hartman * If that's unset, use the tty termios setting. 2402ab4382d2SGreg Kroah-Hartman */ 2403adc8d746SAlan Cox if (port->tty && termios.c_cflag == 0) 2404adc8d746SAlan Cox termios = port->tty->termios; 2405ab4382d2SGreg Kroah-Hartman 240694abc56fSNing Jiang if (console_suspend_enabled) 24076f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2408ab4382d2SGreg Kroah-Hartman uport->ops->set_termios(uport, &termios, NULL); 2409cfab87c2SVijaya Krishna Nivarthi if (!console_suspend_enabled && uport->ops->start_rx) 2410cfab87c2SVijaya Krishna Nivarthi uport->ops->start_rx(uport); 24115933a161SYin Kangkai if (console_suspend_enabled) 2412ab4382d2SGreg Kroah-Hartman console_start(uport->cons); 2413ab4382d2SGreg Kroah-Hartman } 2414ab4382d2SGreg Kroah-Hartman 241580f02d54SPeter Hurley if (tty_port_suspended(port)) { 2416ab4382d2SGreg Kroah-Hartman const struct uart_ops *ops = uport->ops; 2417ab4382d2SGreg Kroah-Hartman int ret; 2418ab4382d2SGreg Kroah-Hartman 24196f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2420ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 2421ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, 0); 2422ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2423ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) { 2424ab4382d2SGreg Kroah-Hartman /* Protected by port mutex for now */ 2425ab4382d2SGreg Kroah-Hartman struct tty_struct *tty = port->tty; 24264ed71addSTamseel Shams 2427ab4382d2SGreg Kroah-Hartman ret = ops->startup(uport); 2428ab4382d2SGreg Kroah-Hartman if (ret == 0) { 2429ab4382d2SGreg Kroah-Hartman if (tty) 2430ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 2431ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 2432ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, uport->mctrl); 2433ab4382d2SGreg Kroah-Hartman ops->start_tx(uport); 2434ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2435d41861caSPeter Hurley tty_port_set_initialized(port, 1); 2436ab4382d2SGreg Kroah-Hartman } else { 2437ab4382d2SGreg Kroah-Hartman /* 2438ab4382d2SGreg Kroah-Hartman * Failed to resume - maybe hardware went away? 2439ab4382d2SGreg Kroah-Hartman * Clear the "initialized" flag so we won't try 2440ab4382d2SGreg Kroah-Hartman * to call the low level drivers shutdown method. 2441ab4382d2SGreg Kroah-Hartman */ 2442ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 2443ab4382d2SGreg Kroah-Hartman } 2444ab4382d2SGreg Kroah-Hartman } 2445ab4382d2SGreg Kroah-Hartman 244680f02d54SPeter Hurley tty_port_set_suspended(port, 0); 2447ab4382d2SGreg Kroah-Hartman } 2448ab4382d2SGreg Kroah-Hartman 2449ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2450ab4382d2SGreg Kroah-Hartman 2451ab4382d2SGreg Kroah-Hartman return 0; 2452ab4382d2SGreg Kroah-Hartman } 245315dc475bSJiri Slaby EXPORT_SYMBOL(uart_resume_port); 2454ab4382d2SGreg Kroah-Hartman 2455ab4382d2SGreg Kroah-Hartman static inline void 2456ab4382d2SGreg Kroah-Hartman uart_report_port(struct uart_driver *drv, struct uart_port *port) 2457ab4382d2SGreg Kroah-Hartman { 2458ab4382d2SGreg Kroah-Hartman char address[64]; 2459ab4382d2SGreg Kroah-Hartman 2460ab4382d2SGreg Kroah-Hartman switch (port->iotype) { 2461ab4382d2SGreg Kroah-Hartman case UPIO_PORT: 2462ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), "I/O 0x%lx", port->iobase); 2463ab4382d2SGreg Kroah-Hartman break; 2464ab4382d2SGreg Kroah-Hartman case UPIO_HUB6: 2465ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), 2466ab4382d2SGreg Kroah-Hartman "I/O 0x%lx offset 0x%x", port->iobase, port->hub6); 2467ab4382d2SGreg Kroah-Hartman break; 2468ab4382d2SGreg Kroah-Hartman case UPIO_MEM: 2469bd94c407SMasahiro Yamada case UPIO_MEM16: 2470ab4382d2SGreg Kroah-Hartman case UPIO_MEM32: 24713ffb1a81SKevin Cernekee case UPIO_MEM32BE: 2472ab4382d2SGreg Kroah-Hartman case UPIO_AU: 2473ab4382d2SGreg Kroah-Hartman case UPIO_TSI: 2474ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), 2475ab4382d2SGreg Kroah-Hartman "MMIO 0x%llx", (unsigned long long)port->mapbase); 2476ab4382d2SGreg Kroah-Hartman break; 2477ab4382d2SGreg Kroah-Hartman default: 2478ab4382d2SGreg Kroah-Hartman strlcpy(address, "*unknown*", sizeof(address)); 2479ab4382d2SGreg Kroah-Hartman break; 2480ab4382d2SGreg Kroah-Hartman } 2481ab4382d2SGreg Kroah-Hartman 2482cade3580SAndy Shevchenko pr_info("%s%s%s at %s (irq = %d, base_baud = %d) is a %s\n", 248368ed7e1cSJames Bottomley port->dev ? dev_name(port->dev) : "", 248468ed7e1cSJames Bottomley port->dev ? ": " : "", 2485cade3580SAndy Shevchenko port->name, 24867d12b976SKees Cook address, port->irq, port->uartclk / 16, uart_type(port)); 2487e7b91932SMaciej W. Rozycki 2488e7b91932SMaciej W. Rozycki /* The magic multiplier feature is a bit obscure, so report it too. */ 2489e7b91932SMaciej W. Rozycki if (port->flags & UPF_MAGIC_MULTIPLIER) 2490e7b91932SMaciej W. Rozycki pr_info("%s%s%s extra baud rates supported: %d, %d", 2491e7b91932SMaciej W. Rozycki port->dev ? dev_name(port->dev) : "", 2492e7b91932SMaciej W. Rozycki port->dev ? ": " : "", 2493e7b91932SMaciej W. Rozycki port->name, 2494e7b91932SMaciej W. Rozycki port->uartclk / 8, port->uartclk / 4); 2495ab4382d2SGreg Kroah-Hartman } 2496ab4382d2SGreg Kroah-Hartman 2497ab4382d2SGreg Kroah-Hartman static void 2498ab4382d2SGreg Kroah-Hartman uart_configure_port(struct uart_driver *drv, struct uart_state *state, 2499ab4382d2SGreg Kroah-Hartman struct uart_port *port) 2500ab4382d2SGreg Kroah-Hartman { 2501ab4382d2SGreg Kroah-Hartman unsigned int flags; 2502ab4382d2SGreg Kroah-Hartman 2503ab4382d2SGreg Kroah-Hartman /* 2504ab4382d2SGreg Kroah-Hartman * If there isn't a port here, don't do anything further. 2505ab4382d2SGreg Kroah-Hartman */ 2506ab4382d2SGreg Kroah-Hartman if (!port->iobase && !port->mapbase && !port->membase) 2507ab4382d2SGreg Kroah-Hartman return; 2508ab4382d2SGreg Kroah-Hartman 2509ab4382d2SGreg Kroah-Hartman /* 2510ab4382d2SGreg Kroah-Hartman * Now do the auto configuration stuff. Note that config_port 2511ab4382d2SGreg Kroah-Hartman * is expected to claim the resources and map the port for us. 2512ab4382d2SGreg Kroah-Hartman */ 2513ab4382d2SGreg Kroah-Hartman flags = 0; 2514ab4382d2SGreg Kroah-Hartman if (port->flags & UPF_AUTO_IRQ) 2515ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_IRQ; 2516ab4382d2SGreg Kroah-Hartman if (port->flags & UPF_BOOT_AUTOCONF) { 2517ab4382d2SGreg Kroah-Hartman if (!(port->flags & UPF_FIXED_TYPE)) { 2518ab4382d2SGreg Kroah-Hartman port->type = PORT_UNKNOWN; 2519ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_TYPE; 2520ab4382d2SGreg Kroah-Hartman } 2521ab4382d2SGreg Kroah-Hartman port->ops->config_port(port, flags); 2522ab4382d2SGreg Kroah-Hartman } 2523ab4382d2SGreg Kroah-Hartman 2524ab4382d2SGreg Kroah-Hartman if (port->type != PORT_UNKNOWN) { 2525ab4382d2SGreg Kroah-Hartman unsigned long flags; 2526ab4382d2SGreg Kroah-Hartman 2527ab4382d2SGreg Kroah-Hartman uart_report_port(drv, port); 2528ab4382d2SGreg Kroah-Hartman 2529ab4382d2SGreg Kroah-Hartman /* Power up port for set_mctrl() */ 25306f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2531ab4382d2SGreg Kroah-Hartman 2532ab4382d2SGreg Kroah-Hartman /* 2533ab4382d2SGreg Kroah-Hartman * Ensure that the modem control lines are de-activated. 2534ab4382d2SGreg Kroah-Hartman * keep the DTR setting that is set in uart_set_options() 2535ab4382d2SGreg Kroah-Hartman * We probably don't need a spinlock around this, but 2536ab4382d2SGreg Kroah-Hartman */ 2537ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 253893a770b7SLukas Wunner port->mctrl &= TIOCM_DTR; 25392dd8a74fSLukas Wunner if (port->rs485.flags & SER_RS485_ENABLED && 25402dd8a74fSLukas Wunner !(port->rs485.flags & SER_RS485_RTS_AFTER_SEND)) 25412dd8a74fSLukas Wunner port->mctrl |= TIOCM_RTS; 254293a770b7SLukas Wunner port->ops->set_mctrl(port, port->mctrl); 2543ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 2544ab4382d2SGreg Kroah-Hartman 2545ab4382d2SGreg Kroah-Hartman /* 2546ab4382d2SGreg Kroah-Hartman * If this driver supports console, and it hasn't been 2547ab4382d2SGreg Kroah-Hartman * successfully registered yet, try to re-register it. 2548ab4382d2SGreg Kroah-Hartman * It may be that the port was not available. 2549ab4382d2SGreg Kroah-Hartman */ 2550ab4382d2SGreg Kroah-Hartman if (port->cons && !(port->cons->flags & CON_ENABLED)) 2551ab4382d2SGreg Kroah-Hartman register_console(port->cons); 2552ab4382d2SGreg Kroah-Hartman 2553ab4382d2SGreg Kroah-Hartman /* 2554ab4382d2SGreg Kroah-Hartman * Power down all ports by default, except the 2555ab4382d2SGreg Kroah-Hartman * console if we have one. 2556ab4382d2SGreg Kroah-Hartman */ 2557ab4382d2SGreg Kroah-Hartman if (!uart_console(port)) 25586f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_OFF); 2559ab4382d2SGreg Kroah-Hartman } 2560ab4382d2SGreg Kroah-Hartman } 2561ab4382d2SGreg Kroah-Hartman 2562ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 2563ab4382d2SGreg Kroah-Hartman 2564ab4382d2SGreg Kroah-Hartman static int uart_poll_init(struct tty_driver *driver, int line, char *options) 2565ab4382d2SGreg Kroah-Hartman { 2566ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2567ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 256849c02304SPeter Hurley struct tty_port *tport; 2569ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2570ab4382d2SGreg Kroah-Hartman int baud = 9600; 2571ab4382d2SGreg Kroah-Hartman int bits = 8; 2572ab4382d2SGreg Kroah-Hartman int parity = 'n'; 2573ab4382d2SGreg Kroah-Hartman int flow = 'n'; 257449c02304SPeter Hurley int ret = 0; 2575ab4382d2SGreg Kroah-Hartman 257649c02304SPeter Hurley tport = &state->port; 257749c02304SPeter Hurley mutex_lock(&tport->mutex); 257849c02304SPeter Hurley 25794047b371SPeter Hurley port = uart_port_check(state); 25804047b371SPeter Hurley if (!port || !(port->ops->poll_get_char && port->ops->poll_put_char)) { 258149c02304SPeter Hurley ret = -1; 258249c02304SPeter Hurley goto out; 258349c02304SPeter Hurley } 2584ab4382d2SGreg Kroah-Hartman 2585c7f3e708SAnton Vorontsov if (port->ops->poll_init) { 2586c7f3e708SAnton Vorontsov /* 2587d41861caSPeter Hurley * We don't set initialized as we only initialized the hw, 2588d41861caSPeter Hurley * e.g. state->xmit is still uninitialized. 2589c7f3e708SAnton Vorontsov */ 2590d41861caSPeter Hurley if (!tty_port_initialized(tport)) 2591c7f3e708SAnton Vorontsov ret = port->ops->poll_init(port); 2592c7f3e708SAnton Vorontsov } 2593c7f3e708SAnton Vorontsov 259449c02304SPeter Hurley if (!ret && options) { 2595ab4382d2SGreg Kroah-Hartman uart_parse_options(options, &baud, &parity, &bits, &flow); 259649c02304SPeter Hurley ret = uart_set_options(port, NULL, baud, parity, bits, flow); 2597ab4382d2SGreg Kroah-Hartman } 259849c02304SPeter Hurley out: 259949c02304SPeter Hurley mutex_unlock(&tport->mutex); 260049c02304SPeter Hurley return ret; 2601ab4382d2SGreg Kroah-Hartman } 2602ab4382d2SGreg Kroah-Hartman 2603ab4382d2SGreg Kroah-Hartman static int uart_poll_get_char(struct tty_driver *driver, int line) 2604ab4382d2SGreg Kroah-Hartman { 2605ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2606ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2607ab4382d2SGreg Kroah-Hartman struct uart_port *port; 26089ed19428SPeter Hurley int ret = -1; 2609ab4382d2SGreg Kroah-Hartman 26109ed19428SPeter Hurley port = uart_port_ref(state); 2611ef510beaSAndy Shevchenko if (port) { 26129ed19428SPeter Hurley ret = port->ops->poll_get_char(port); 26139ed19428SPeter Hurley uart_port_deref(port); 26149ed19428SPeter Hurley } 261522077b09SJiri Slaby 26169ed19428SPeter Hurley return ret; 2617ab4382d2SGreg Kroah-Hartman } 2618ab4382d2SGreg Kroah-Hartman 2619ab4382d2SGreg Kroah-Hartman static void uart_poll_put_char(struct tty_driver *driver, int line, char ch) 2620ab4382d2SGreg Kroah-Hartman { 2621ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2622ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2623ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2624ab4382d2SGreg Kroah-Hartman 26259ed19428SPeter Hurley port = uart_port_ref(state); 26269ed19428SPeter Hurley if (!port) 26279ed19428SPeter Hurley return; 2628c7d44a02SDoug Anderson 2629c7d44a02SDoug Anderson if (ch == '\n') 2630c7d44a02SDoug Anderson port->ops->poll_put_char(port, '\r'); 2631ab4382d2SGreg Kroah-Hartman port->ops->poll_put_char(port, ch); 26329ed19428SPeter Hurley uart_port_deref(port); 2633ab4382d2SGreg Kroah-Hartman } 2634ab4382d2SGreg Kroah-Hartman #endif 2635ab4382d2SGreg Kroah-Hartman 2636ab4382d2SGreg Kroah-Hartman static const struct tty_operations uart_ops = { 26374cdd17baSJiri Slaby .install = uart_install, 2638ab4382d2SGreg Kroah-Hartman .open = uart_open, 2639ab4382d2SGreg Kroah-Hartman .close = uart_close, 2640ab4382d2SGreg Kroah-Hartman .write = uart_write, 2641ab4382d2SGreg Kroah-Hartman .put_char = uart_put_char, 2642ab4382d2SGreg Kroah-Hartman .flush_chars = uart_flush_chars, 2643ab4382d2SGreg Kroah-Hartman .write_room = uart_write_room, 2644ab4382d2SGreg Kroah-Hartman .chars_in_buffer= uart_chars_in_buffer, 2645ab4382d2SGreg Kroah-Hartman .flush_buffer = uart_flush_buffer, 2646ab4382d2SGreg Kroah-Hartman .ioctl = uart_ioctl, 2647ab4382d2SGreg Kroah-Hartman .throttle = uart_throttle, 2648ab4382d2SGreg Kroah-Hartman .unthrottle = uart_unthrottle, 2649ab4382d2SGreg Kroah-Hartman .send_xchar = uart_send_xchar, 2650ab4382d2SGreg Kroah-Hartman .set_termios = uart_set_termios, 2651ab4382d2SGreg Kroah-Hartman .set_ldisc = uart_set_ldisc, 2652ab4382d2SGreg Kroah-Hartman .stop = uart_stop, 2653ab4382d2SGreg Kroah-Hartman .start = uart_start, 2654ab4382d2SGreg Kroah-Hartman .hangup = uart_hangup, 2655ab4382d2SGreg Kroah-Hartman .break_ctl = uart_break_ctl, 2656ab4382d2SGreg Kroah-Hartman .wait_until_sent= uart_wait_until_sent, 2657ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_PROC_FS 26588a8dcabfSChristoph Hellwig .proc_show = uart_proc_show, 2659ab4382d2SGreg Kroah-Hartman #endif 2660ab4382d2SGreg Kroah-Hartman .tiocmget = uart_tiocmget, 2661ab4382d2SGreg Kroah-Hartman .tiocmset = uart_tiocmset, 26625099d234SAl Viro .set_serial = uart_set_info_user, 26635099d234SAl Viro .get_serial = uart_get_info_user, 2664ab4382d2SGreg Kroah-Hartman .get_icount = uart_get_icount, 2665ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 2666ab4382d2SGreg Kroah-Hartman .poll_init = uart_poll_init, 2667ab4382d2SGreg Kroah-Hartman .poll_get_char = uart_poll_get_char, 2668ab4382d2SGreg Kroah-Hartman .poll_put_char = uart_poll_put_char, 2669ab4382d2SGreg Kroah-Hartman #endif 2670ab4382d2SGreg Kroah-Hartman }; 2671ab4382d2SGreg Kroah-Hartman 2672ab4382d2SGreg Kroah-Hartman static const struct tty_port_operations uart_port_ops = { 2673ab4382d2SGreg Kroah-Hartman .carrier_raised = uart_carrier_raised, 2674ab4382d2SGreg Kroah-Hartman .dtr_rts = uart_dtr_rts, 2675b3b57646SRob Herring .activate = uart_port_activate, 2676761ed4a9SRob Herring .shutdown = uart_tty_port_shutdown, 2677ab4382d2SGreg Kroah-Hartman }; 2678ab4382d2SGreg Kroah-Hartman 2679ab4382d2SGreg Kroah-Hartman /** 2680ab4382d2SGreg Kroah-Hartman * uart_register_driver - register a driver with the uart core layer 2681ab4382d2SGreg Kroah-Hartman * @drv: low level driver structure 2682ab4382d2SGreg Kroah-Hartman * 2683ab4382d2SGreg Kroah-Hartman * Register a uart driver with the core driver. We in turn register 2684ab4382d2SGreg Kroah-Hartman * with the tty layer, and initialise the core driver per-port state. 2685ab4382d2SGreg Kroah-Hartman * 2686ab4382d2SGreg Kroah-Hartman * We have a proc file in /proc/tty/driver which is named after the 2687ab4382d2SGreg Kroah-Hartman * normal driver. 2688ab4382d2SGreg Kroah-Hartman * 2689ab4382d2SGreg Kroah-Hartman * drv->port should be NULL, and the per-port structures should be 2690ab4382d2SGreg Kroah-Hartman * registered using uart_add_one_port after this call has succeeded. 2691ab4382d2SGreg Kroah-Hartman */ 2692ab4382d2SGreg Kroah-Hartman int uart_register_driver(struct uart_driver *drv) 2693ab4382d2SGreg Kroah-Hartman { 2694ab4382d2SGreg Kroah-Hartman struct tty_driver *normal; 2695050dfc09SSergey Organov int i, retval = -ENOMEM; 2696ab4382d2SGreg Kroah-Hartman 2697ab4382d2SGreg Kroah-Hartman BUG_ON(drv->state); 2698ab4382d2SGreg Kroah-Hartman 2699ab4382d2SGreg Kroah-Hartman /* 2700ab4382d2SGreg Kroah-Hartman * Maybe we should be using a slab cache for this, especially if 2701ab4382d2SGreg Kroah-Hartman * we have a large number of ports to handle. 2702ab4382d2SGreg Kroah-Hartman */ 27036396bb22SKees Cook drv->state = kcalloc(drv->nr, sizeof(struct uart_state), GFP_KERNEL); 2704ab4382d2SGreg Kroah-Hartman if (!drv->state) 2705ab4382d2SGreg Kroah-Hartman goto out; 2706ab4382d2SGreg Kroah-Hartman 270739b7b42bSJiri Slaby normal = tty_alloc_driver(drv->nr, TTY_DRIVER_REAL_RAW | 270839b7b42bSJiri Slaby TTY_DRIVER_DYNAMIC_DEV); 270939b7b42bSJiri Slaby if (IS_ERR(normal)) { 271039b7b42bSJiri Slaby retval = PTR_ERR(normal); 2711ab4382d2SGreg Kroah-Hartman goto out_kfree; 271239b7b42bSJiri Slaby } 2713ab4382d2SGreg Kroah-Hartman 2714ab4382d2SGreg Kroah-Hartman drv->tty_driver = normal; 2715ab4382d2SGreg Kroah-Hartman 2716ab4382d2SGreg Kroah-Hartman normal->driver_name = drv->driver_name; 2717ab4382d2SGreg Kroah-Hartman normal->name = drv->dev_name; 2718ab4382d2SGreg Kroah-Hartman normal->major = drv->major; 2719ab4382d2SGreg Kroah-Hartman normal->minor_start = drv->minor; 2720ab4382d2SGreg Kroah-Hartman normal->type = TTY_DRIVER_TYPE_SERIAL; 2721ab4382d2SGreg Kroah-Hartman normal->subtype = SERIAL_TYPE_NORMAL; 2722ab4382d2SGreg Kroah-Hartman normal->init_termios = tty_std_termios; 2723ab4382d2SGreg Kroah-Hartman normal->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; 2724ab4382d2SGreg Kroah-Hartman normal->init_termios.c_ispeed = normal->init_termios.c_ospeed = 9600; 2725ab4382d2SGreg Kroah-Hartman normal->driver_state = drv; 2726ab4382d2SGreg Kroah-Hartman tty_set_operations(normal, &uart_ops); 2727ab4382d2SGreg Kroah-Hartman 2728ab4382d2SGreg Kroah-Hartman /* 2729ab4382d2SGreg Kroah-Hartman * Initialise the UART state(s). 2730ab4382d2SGreg Kroah-Hartman */ 2731ab4382d2SGreg Kroah-Hartman for (i = 0; i < drv->nr; i++) { 2732ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + i; 2733ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2734ab4382d2SGreg Kroah-Hartman 2735ab4382d2SGreg Kroah-Hartman tty_port_init(port); 2736ab4382d2SGreg Kroah-Hartman port->ops = &uart_port_ops; 2737ab4382d2SGreg Kroah-Hartman } 2738ab4382d2SGreg Kroah-Hartman 2739ab4382d2SGreg Kroah-Hartman retval = tty_register_driver(normal); 2740ab4382d2SGreg Kroah-Hartman if (retval >= 0) 2741ab4382d2SGreg Kroah-Hartman return retval; 2742ab4382d2SGreg Kroah-Hartman 2743191c5f10SJiri Slaby for (i = 0; i < drv->nr; i++) 2744191c5f10SJiri Slaby tty_port_destroy(&drv->state[i].port); 27459f90a4ddSJiri Slaby tty_driver_kref_put(normal); 2746ab4382d2SGreg Kroah-Hartman out_kfree: 2747ab4382d2SGreg Kroah-Hartman kfree(drv->state); 2748ab4382d2SGreg Kroah-Hartman out: 2749050dfc09SSergey Organov return retval; 2750ab4382d2SGreg Kroah-Hartman } 275115dc475bSJiri Slaby EXPORT_SYMBOL(uart_register_driver); 2752ab4382d2SGreg Kroah-Hartman 2753ab4382d2SGreg Kroah-Hartman /** 2754ab4382d2SGreg Kroah-Hartman * uart_unregister_driver - remove a driver from the uart core layer 2755ab4382d2SGreg Kroah-Hartman * @drv: low level driver structure 2756ab4382d2SGreg Kroah-Hartman * 2757ab4382d2SGreg Kroah-Hartman * Remove all references to a driver from the core driver. The low 2758ab4382d2SGreg Kroah-Hartman * level driver must have removed all its ports via the 2759ab4382d2SGreg Kroah-Hartman * uart_remove_one_port() if it registered them with uart_add_one_port(). 2760ab4382d2SGreg Kroah-Hartman * (ie, drv->port == NULL) 2761ab4382d2SGreg Kroah-Hartman */ 2762ab4382d2SGreg Kroah-Hartman void uart_unregister_driver(struct uart_driver *drv) 2763ab4382d2SGreg Kroah-Hartman { 2764ab4382d2SGreg Kroah-Hartman struct tty_driver *p = drv->tty_driver; 2765191c5f10SJiri Slaby unsigned int i; 2766191c5f10SJiri Slaby 2767ab4382d2SGreg Kroah-Hartman tty_unregister_driver(p); 27689f90a4ddSJiri Slaby tty_driver_kref_put(p); 2769191c5f10SJiri Slaby for (i = 0; i < drv->nr; i++) 2770191c5f10SJiri Slaby tty_port_destroy(&drv->state[i].port); 2771ab4382d2SGreg Kroah-Hartman kfree(drv->state); 27721e66cdedSAlan Cox drv->state = NULL; 2773ab4382d2SGreg Kroah-Hartman drv->tty_driver = NULL; 2774ab4382d2SGreg Kroah-Hartman } 277515dc475bSJiri Slaby EXPORT_SYMBOL(uart_unregister_driver); 2776ab4382d2SGreg Kroah-Hartman 2777ab4382d2SGreg Kroah-Hartman struct tty_driver *uart_console_device(struct console *co, int *index) 2778ab4382d2SGreg Kroah-Hartman { 2779ab4382d2SGreg Kroah-Hartman struct uart_driver *p = co->data; 2780ab4382d2SGreg Kroah-Hartman *index = co->index; 2781ab4382d2SGreg Kroah-Hartman return p->tty_driver; 2782ab4382d2SGreg Kroah-Hartman } 2783488f49acSJohn Stultz EXPORT_SYMBOL_GPL(uart_console_device); 2784ab4382d2SGreg Kroah-Hartman 2785143c02c8SAndy Shevchenko static ssize_t uartclk_show(struct device *dev, 27866915c0e4STomas Hlavacek struct device_attribute *attr, char *buf) 27876915c0e4STomas Hlavacek { 2788bebe73e3SAlan Cox struct serial_struct tmp; 27896915c0e4STomas Hlavacek struct tty_port *port = dev_get_drvdata(dev); 2790b1b79916STomas Hlavacek 27919f109694SAlan Cox uart_get_info(port, &tmp); 27929cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.baud_base * 16); 27936915c0e4STomas Hlavacek } 27946915c0e4STomas Hlavacek 2795143c02c8SAndy Shevchenko static ssize_t type_show(struct device *dev, 2796373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2797373bac4cSAlan Cox { 2798373bac4cSAlan Cox struct serial_struct tmp; 2799373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2800373bac4cSAlan Cox 2801373bac4cSAlan Cox uart_get_info(port, &tmp); 28029cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.type); 2803373bac4cSAlan Cox } 2804143c02c8SAndy Shevchenko 2805143c02c8SAndy Shevchenko static ssize_t line_show(struct device *dev, 2806373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2807373bac4cSAlan Cox { 2808373bac4cSAlan Cox struct serial_struct tmp; 2809373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2810373bac4cSAlan Cox 2811373bac4cSAlan Cox uart_get_info(port, &tmp); 28129cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.line); 2813373bac4cSAlan Cox } 2814373bac4cSAlan Cox 2815143c02c8SAndy Shevchenko static ssize_t port_show(struct device *dev, 2816373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2817373bac4cSAlan Cox { 2818373bac4cSAlan Cox struct serial_struct tmp; 2819373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2820fd985e1dSAndrew Morton unsigned long ioaddr; 2821373bac4cSAlan Cox 2822373bac4cSAlan Cox uart_get_info(port, &tmp); 2823fd985e1dSAndrew Morton ioaddr = tmp.port; 2824fd985e1dSAndrew Morton if (HIGH_BITS_OFFSET) 2825fd985e1dSAndrew Morton ioaddr |= (unsigned long)tmp.port_high << HIGH_BITS_OFFSET; 28269cfbf7a6SAlex Dewar return sprintf(buf, "0x%lX\n", ioaddr); 2827373bac4cSAlan Cox } 2828373bac4cSAlan Cox 2829143c02c8SAndy Shevchenko static ssize_t irq_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.irq); 2837373bac4cSAlan Cox } 2838373bac4cSAlan Cox 2839143c02c8SAndy Shevchenko static ssize_t flags_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, "0x%X\n", tmp.flags); 2847373bac4cSAlan Cox } 2848373bac4cSAlan Cox 2849143c02c8SAndy Shevchenko static ssize_t xmit_fifo_size_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.xmit_fifo_size); 2857373bac4cSAlan Cox } 2858373bac4cSAlan Cox 2859143c02c8SAndy Shevchenko static ssize_t close_delay_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.close_delay); 2867373bac4cSAlan Cox } 2868373bac4cSAlan Cox 2869143c02c8SAndy Shevchenko static ssize_t closing_wait_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, "%d\n", tmp.closing_wait); 2877373bac4cSAlan Cox } 2878373bac4cSAlan Cox 2879143c02c8SAndy Shevchenko static ssize_t custom_divisor_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.custom_divisor); 2887373bac4cSAlan Cox } 2888373bac4cSAlan Cox 2889143c02c8SAndy Shevchenko static ssize_t io_type_show(struct device *dev, 2890373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2891373bac4cSAlan Cox { 2892373bac4cSAlan Cox struct serial_struct tmp; 2893373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2894373bac4cSAlan Cox 2895373bac4cSAlan Cox uart_get_info(port, &tmp); 28969cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.io_type); 2897373bac4cSAlan Cox } 2898373bac4cSAlan Cox 2899143c02c8SAndy Shevchenko static ssize_t iomem_base_show(struct device *dev, 2900373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2901373bac4cSAlan Cox { 2902373bac4cSAlan Cox struct serial_struct tmp; 2903373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2904373bac4cSAlan Cox 2905373bac4cSAlan Cox uart_get_info(port, &tmp); 29069cfbf7a6SAlex Dewar return sprintf(buf, "0x%lX\n", (unsigned long)tmp.iomem_base); 2907373bac4cSAlan Cox } 2908373bac4cSAlan Cox 2909143c02c8SAndy Shevchenko static ssize_t iomem_reg_shift_show(struct device *dev, 2910373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2911373bac4cSAlan Cox { 2912373bac4cSAlan Cox struct serial_struct tmp; 2913373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2914373bac4cSAlan Cox 2915373bac4cSAlan Cox uart_get_info(port, &tmp); 29169cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.iomem_reg_shift); 2917373bac4cSAlan Cox } 2918373bac4cSAlan Cox 2919a3cb39d2SAndy Shevchenko static ssize_t console_show(struct device *dev, 2920a3cb39d2SAndy Shevchenko struct device_attribute *attr, char *buf) 2921a3cb39d2SAndy Shevchenko { 2922a3cb39d2SAndy Shevchenko struct tty_port *port = dev_get_drvdata(dev); 2923a3cb39d2SAndy Shevchenko struct uart_state *state = container_of(port, struct uart_state, port); 2924a3cb39d2SAndy Shevchenko struct uart_port *uport; 2925a3cb39d2SAndy Shevchenko bool console = false; 2926a3cb39d2SAndy Shevchenko 2927a3cb39d2SAndy Shevchenko mutex_lock(&port->mutex); 2928a3cb39d2SAndy Shevchenko uport = uart_port_check(state); 2929a3cb39d2SAndy Shevchenko if (uport) 2930a3cb39d2SAndy Shevchenko console = uart_console_enabled(uport); 2931a3cb39d2SAndy Shevchenko mutex_unlock(&port->mutex); 2932a3cb39d2SAndy Shevchenko 2933a3cb39d2SAndy Shevchenko return sprintf(buf, "%c\n", console ? 'Y' : 'N'); 2934a3cb39d2SAndy Shevchenko } 2935a3cb39d2SAndy Shevchenko 2936a3cb39d2SAndy Shevchenko static ssize_t console_store(struct device *dev, 2937a3cb39d2SAndy Shevchenko struct device_attribute *attr, const char *buf, size_t count) 2938a3cb39d2SAndy Shevchenko { 2939a3cb39d2SAndy Shevchenko struct tty_port *port = dev_get_drvdata(dev); 2940a3cb39d2SAndy Shevchenko struct uart_state *state = container_of(port, struct uart_state, port); 2941a3cb39d2SAndy Shevchenko struct uart_port *uport; 2942a3cb39d2SAndy Shevchenko bool oldconsole, newconsole; 2943a3cb39d2SAndy Shevchenko int ret; 2944a3cb39d2SAndy Shevchenko 2945a3cb39d2SAndy Shevchenko ret = kstrtobool(buf, &newconsole); 2946a3cb39d2SAndy Shevchenko if (ret) 2947a3cb39d2SAndy Shevchenko return ret; 2948a3cb39d2SAndy Shevchenko 2949a3cb39d2SAndy Shevchenko mutex_lock(&port->mutex); 2950a3cb39d2SAndy Shevchenko uport = uart_port_check(state); 2951a3cb39d2SAndy Shevchenko if (uport) { 2952a3cb39d2SAndy Shevchenko oldconsole = uart_console_enabled(uport); 2953a3cb39d2SAndy Shevchenko if (oldconsole && !newconsole) { 2954a3cb39d2SAndy Shevchenko ret = unregister_console(uport->cons); 2955a3cb39d2SAndy Shevchenko } else if (!oldconsole && newconsole) { 2956e0830dbfSJohan Hovold if (uart_console(uport)) { 2957e0830dbfSJohan Hovold uport->console_reinit = 1; 2958a3cb39d2SAndy Shevchenko register_console(uport->cons); 2959e0830dbfSJohan Hovold } else { 2960a3cb39d2SAndy Shevchenko ret = -ENOENT; 2961a3cb39d2SAndy Shevchenko } 2962e0830dbfSJohan Hovold } 2963a3cb39d2SAndy Shevchenko } else { 2964a3cb39d2SAndy Shevchenko ret = -ENXIO; 2965a3cb39d2SAndy Shevchenko } 2966a3cb39d2SAndy Shevchenko mutex_unlock(&port->mutex); 2967a3cb39d2SAndy Shevchenko 2968a3cb39d2SAndy Shevchenko return ret < 0 ? ret : count; 2969a3cb39d2SAndy Shevchenko } 2970a3cb39d2SAndy Shevchenko 2971143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(uartclk); 2972143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(type); 2973143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(line); 2974143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(port); 2975143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(irq); 2976143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(flags); 2977143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(xmit_fifo_size); 2978143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(close_delay); 2979143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(closing_wait); 2980143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(custom_divisor); 2981143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(io_type); 2982143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(iomem_base); 2983143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(iomem_reg_shift); 2984a3cb39d2SAndy Shevchenko static DEVICE_ATTR_RW(console); 29856915c0e4STomas Hlavacek 29866915c0e4STomas Hlavacek static struct attribute *tty_dev_attrs[] = { 2987143c02c8SAndy Shevchenko &dev_attr_uartclk.attr, 2988373bac4cSAlan Cox &dev_attr_type.attr, 2989373bac4cSAlan Cox &dev_attr_line.attr, 2990373bac4cSAlan Cox &dev_attr_port.attr, 2991373bac4cSAlan Cox &dev_attr_irq.attr, 2992373bac4cSAlan Cox &dev_attr_flags.attr, 2993373bac4cSAlan Cox &dev_attr_xmit_fifo_size.attr, 2994373bac4cSAlan Cox &dev_attr_close_delay.attr, 2995373bac4cSAlan Cox &dev_attr_closing_wait.attr, 2996373bac4cSAlan Cox &dev_attr_custom_divisor.attr, 2997373bac4cSAlan Cox &dev_attr_io_type.attr, 2998373bac4cSAlan Cox &dev_attr_iomem_base.attr, 2999373bac4cSAlan Cox &dev_attr_iomem_reg_shift.attr, 3000a3cb39d2SAndy Shevchenko &dev_attr_console.attr, 3001a3cb39d2SAndy Shevchenko NULL 30026915c0e4STomas Hlavacek }; 30036915c0e4STomas Hlavacek 3004b1b79916STomas Hlavacek static const struct attribute_group tty_dev_attr_group = { 30056915c0e4STomas Hlavacek .attrs = tty_dev_attrs, 30066915c0e4STomas Hlavacek }; 30076915c0e4STomas Hlavacek 3008ab4382d2SGreg Kroah-Hartman /** 3009ab4382d2SGreg Kroah-Hartman * uart_add_one_port - attach a driver-defined port structure 3010ab4382d2SGreg Kroah-Hartman * @drv: pointer to the uart low level driver structure for this port 3011ab4382d2SGreg Kroah-Hartman * @uport: uart port structure to use for this port. 3012ab4382d2SGreg Kroah-Hartman * 3013a157270fSAhmed S. Darwish * Context: task context, might sleep 3014a157270fSAhmed S. Darwish * 3015ab4382d2SGreg Kroah-Hartman * This allows the driver to register its own uart_port structure 3016ab4382d2SGreg Kroah-Hartman * with the core driver. The main purpose is to allow the low 3017ab4382d2SGreg Kroah-Hartman * level uart drivers to expand uart_port, rather than having yet 3018ab4382d2SGreg Kroah-Hartman * more levels of structures. 3019ab4382d2SGreg Kroah-Hartman */ 3020ab4382d2SGreg Kroah-Hartman int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport) 3021ab4382d2SGreg Kroah-Hartman { 3022ab4382d2SGreg Kroah-Hartman struct uart_state *state; 3023ab4382d2SGreg Kroah-Hartman struct tty_port *port; 3024ab4382d2SGreg Kroah-Hartman int ret = 0; 3025ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 3026266dcff0SGreg Kroah-Hartman int num_groups; 3027ab4382d2SGreg Kroah-Hartman 3028ab4382d2SGreg Kroah-Hartman if (uport->line >= drv->nr) 3029ab4382d2SGreg Kroah-Hartman return -EINVAL; 3030ab4382d2SGreg Kroah-Hartman 3031ab4382d2SGreg Kroah-Hartman state = drv->state + uport->line; 3032ab4382d2SGreg Kroah-Hartman port = &state->port; 3033ab4382d2SGreg Kroah-Hartman 3034ab4382d2SGreg Kroah-Hartman mutex_lock(&port_mutex); 3035ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 3036ab4382d2SGreg Kroah-Hartman if (state->uart_port) { 3037ab4382d2SGreg Kroah-Hartman ret = -EINVAL; 3038ab4382d2SGreg Kroah-Hartman goto out; 3039ab4382d2SGreg Kroah-Hartman } 3040ab4382d2SGreg Kroah-Hartman 30412b702b9bSPeter Hurley /* Link the port to the driver state table and vice versa */ 30429ed19428SPeter Hurley atomic_set(&state->refcount, 1); 30439ed19428SPeter Hurley init_waitqueue_head(&state->remove_wait); 3044ab4382d2SGreg Kroah-Hartman state->uart_port = uport; 3045ab4382d2SGreg Kroah-Hartman uport->state = state; 3046ab4382d2SGreg Kroah-Hartman 30472b702b9bSPeter Hurley state->pm_state = UART_PM_STATE_UNDEFINED; 30482b702b9bSPeter Hurley uport->cons = drv->cons; 3049959801feSPeter Hurley uport->minor = drv->tty_driver->minor_start + uport->line; 3050f7048b15SVignesh R uport->name = kasprintf(GFP_KERNEL, "%s%d", drv->dev_name, 3051f7048b15SVignesh R drv->tty_driver->name_base + uport->line); 3052f7048b15SVignesh R if (!uport->name) { 3053f7048b15SVignesh R ret = -ENOMEM; 3054f7048b15SVignesh R goto out; 3055f7048b15SVignesh R } 30562b702b9bSPeter Hurley 3057fe88c648SJohan Hovold /* 3058fe88c648SJohan Hovold * If this port is in use as a console then the spinlock is already 3059fe88c648SJohan Hovold * initialised. 3060fe88c648SJohan Hovold */ 3061fe88c648SJohan Hovold if (!uart_console_enabled(uport)) 3062d2403cadSAndy Shevchenko uart_port_spin_lock_init(uport); 3063d2403cadSAndy Shevchenko 3064a208ffd2SGrant Likely if (uport->cons && uport->dev) 3065dd8b7a1dSMichal Simek of_console_check(uport->dev->of_node, uport->cons->name, uport->line); 3066ab4382d2SGreg Kroah-Hartman 3067fb2b9001SSudip Mukherjee tty_port_link_device(port, drv->tty_driver, uport->line); 3068ab4382d2SGreg Kroah-Hartman uart_configure_port(drv, state, uport); 3069ab4382d2SGreg Kroah-Hartman 30704dda864dSGeert Uytterhoeven port->console = uart_console(uport); 30714dda864dSGeert Uytterhoeven 3072266dcff0SGreg Kroah-Hartman num_groups = 2; 3073266dcff0SGreg Kroah-Hartman if (uport->attr_group) 3074266dcff0SGreg Kroah-Hartman num_groups++; 3075266dcff0SGreg Kroah-Hartman 3076c2b703b8SYoshihiro YUNOMAE uport->tty_groups = kcalloc(num_groups, sizeof(*uport->tty_groups), 3077266dcff0SGreg Kroah-Hartman GFP_KERNEL); 3078266dcff0SGreg Kroah-Hartman if (!uport->tty_groups) { 3079266dcff0SGreg Kroah-Hartman ret = -ENOMEM; 3080266dcff0SGreg Kroah-Hartman goto out; 3081266dcff0SGreg Kroah-Hartman } 3082266dcff0SGreg Kroah-Hartman uport->tty_groups[0] = &tty_dev_attr_group; 3083266dcff0SGreg Kroah-Hartman if (uport->attr_group) 3084266dcff0SGreg Kroah-Hartman uport->tty_groups[1] = uport->attr_group; 3085266dcff0SGreg Kroah-Hartman 3086ab4382d2SGreg Kroah-Hartman /* 3087ab4382d2SGreg Kroah-Hartman * Register the port whether it's detected or not. This allows 3088015355b7SGeert Uytterhoeven * setserial to be used to alter this port's parameters. 3089ab4382d2SGreg Kroah-Hartman */ 3090da4c2799SJohan Hovold tty_dev = tty_port_register_device_attr_serdev(port, drv->tty_driver, 3091266dcff0SGreg Kroah-Hartman uport->line, uport->dev, port, uport->tty_groups); 3092b289c496SChengguang Xu if (!IS_ERR(tty_dev)) { 309377359835SSimon Glass device_set_wakeup_capable(tty_dev, 1); 309477359835SSimon Glass } else { 30952f2dafe7SSudip Mukherjee dev_err(uport->dev, "Cannot register tty device on line %d\n", 3096ab4382d2SGreg Kroah-Hartman uport->line); 309777359835SSimon Glass } 3098ab4382d2SGreg Kroah-Hartman 3099ab4382d2SGreg Kroah-Hartman /* 3100ab4382d2SGreg Kroah-Hartman * Ensure UPF_DEAD is not set. 3101ab4382d2SGreg Kroah-Hartman */ 3102ab4382d2SGreg Kroah-Hartman uport->flags &= ~UPF_DEAD; 3103ab4382d2SGreg Kroah-Hartman 3104ab4382d2SGreg Kroah-Hartman out: 3105ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 3106ab4382d2SGreg Kroah-Hartman mutex_unlock(&port_mutex); 3107ab4382d2SGreg Kroah-Hartman 3108ab4382d2SGreg Kroah-Hartman return ret; 3109ab4382d2SGreg Kroah-Hartman } 311015dc475bSJiri Slaby EXPORT_SYMBOL(uart_add_one_port); 3111ab4382d2SGreg Kroah-Hartman 3112ab4382d2SGreg Kroah-Hartman /** 3113ab4382d2SGreg Kroah-Hartman * uart_remove_one_port - detach a driver defined port structure 3114ab4382d2SGreg Kroah-Hartman * @drv: pointer to the uart low level driver structure for this port 3115ab4382d2SGreg Kroah-Hartman * @uport: uart port structure for this port 3116ab4382d2SGreg Kroah-Hartman * 3117a157270fSAhmed S. Darwish * Context: task context, might sleep 3118a157270fSAhmed S. Darwish * 3119ab4382d2SGreg Kroah-Hartman * This unhooks (and hangs up) the specified port structure from the 3120ab4382d2SGreg Kroah-Hartman * core driver. No further calls will be made to the low-level code 3121ab4382d2SGreg Kroah-Hartman * for this port. 3122ab4382d2SGreg Kroah-Hartman */ 3123ab4382d2SGreg Kroah-Hartman int uart_remove_one_port(struct uart_driver *drv, struct uart_port *uport) 3124ab4382d2SGreg Kroah-Hartman { 3125ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 3126ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 31274047b371SPeter Hurley struct uart_port *uart_port; 31284c6d5b4dSGeert Uytterhoeven struct tty_struct *tty; 3129b342dd51SChen Gang int ret = 0; 3130ab4382d2SGreg Kroah-Hartman 3131ab4382d2SGreg Kroah-Hartman mutex_lock(&port_mutex); 3132ab4382d2SGreg Kroah-Hartman 3133ab4382d2SGreg Kroah-Hartman /* 3134ab4382d2SGreg Kroah-Hartman * Mark the port "dead" - this prevents any opens from 3135ab4382d2SGreg Kroah-Hartman * succeeding while we shut down the port. 3136ab4382d2SGreg Kroah-Hartman */ 3137ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 31384047b371SPeter Hurley uart_port = uart_port_check(state); 31394047b371SPeter Hurley if (uart_port != uport) 31404047b371SPeter Hurley dev_alert(uport->dev, "Removing wrong port: %p != %p\n", 31414047b371SPeter Hurley uart_port, uport); 31424047b371SPeter Hurley 31434047b371SPeter Hurley if (!uart_port) { 3144b342dd51SChen Gang mutex_unlock(&port->mutex); 3145b342dd51SChen Gang ret = -EINVAL; 3146b342dd51SChen Gang goto out; 3147b342dd51SChen Gang } 3148ab4382d2SGreg Kroah-Hartman uport->flags |= UPF_DEAD; 3149ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 3150ab4382d2SGreg Kroah-Hartman 3151ab4382d2SGreg Kroah-Hartman /* 3152ab4382d2SGreg Kroah-Hartman * Remove the devices from the tty layer 3153ab4382d2SGreg Kroah-Hartman */ 3154da4c2799SJohan Hovold tty_port_unregister_device(port, drv->tty_driver, uport->line); 3155ab4382d2SGreg Kroah-Hartman 31564c6d5b4dSGeert Uytterhoeven tty = tty_port_tty_get(port); 31574c6d5b4dSGeert Uytterhoeven if (tty) { 3158ab4382d2SGreg Kroah-Hartman tty_vhangup(port->tty); 31594c6d5b4dSGeert Uytterhoeven tty_kref_put(tty); 31604c6d5b4dSGeert Uytterhoeven } 3161ab4382d2SGreg Kroah-Hartman 3162ab4382d2SGreg Kroah-Hartman /* 31635f5c9ae5SGeert Uytterhoeven * If the port is used as a console, unregister it 31645f5c9ae5SGeert Uytterhoeven */ 31655f5c9ae5SGeert Uytterhoeven if (uart_console(uport)) 31665f5c9ae5SGeert Uytterhoeven unregister_console(uport->cons); 31675f5c9ae5SGeert Uytterhoeven 31685f5c9ae5SGeert Uytterhoeven /* 3169ab4382d2SGreg Kroah-Hartman * Free the port IO and memory resources, if any. 3170ab4382d2SGreg Kroah-Hartman */ 3171a7cfaf16SFabio Estevam if (uport->type != PORT_UNKNOWN && uport->ops->release_port) 3172ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 3173266dcff0SGreg Kroah-Hartman kfree(uport->tty_groups); 3174f7048b15SVignesh R kfree(uport->name); 3175ab4382d2SGreg Kroah-Hartman 3176ab4382d2SGreg Kroah-Hartman /* 3177ab4382d2SGreg Kroah-Hartman * Indicate that there isn't a port here anymore. 3178ab4382d2SGreg Kroah-Hartman */ 3179ab4382d2SGreg Kroah-Hartman uport->type = PORT_UNKNOWN; 3180ab4382d2SGreg Kroah-Hartman 31814047b371SPeter Hurley mutex_lock(&port->mutex); 31829ed19428SPeter Hurley WARN_ON(atomic_dec_return(&state->refcount) < 0); 31839ed19428SPeter Hurley wait_event(state->remove_wait, !atomic_read(&state->refcount)); 3184ab4382d2SGreg Kroah-Hartman state->uart_port = NULL; 31854047b371SPeter Hurley mutex_unlock(&port->mutex); 3186b342dd51SChen Gang out: 3187ab4382d2SGreg Kroah-Hartman mutex_unlock(&port_mutex); 3188ab4382d2SGreg Kroah-Hartman 3189b342dd51SChen Gang return ret; 3190ab4382d2SGreg Kroah-Hartman } 319115dc475bSJiri Slaby EXPORT_SYMBOL(uart_remove_one_port); 3192ab4382d2SGreg Kroah-Hartman 3193ab4382d2SGreg Kroah-Hartman /* 3194ab4382d2SGreg Kroah-Hartman * Are the two ports equivalent? 3195ab4382d2SGreg Kroah-Hartman */ 3196b8be5db5SJiri Slaby bool uart_match_port(const struct uart_port *port1, 3197b8be5db5SJiri Slaby const struct uart_port *port2) 3198ab4382d2SGreg Kroah-Hartman { 3199ab4382d2SGreg Kroah-Hartman if (port1->iotype != port2->iotype) 3200b8be5db5SJiri Slaby return false; 3201ab4382d2SGreg Kroah-Hartman 3202ab4382d2SGreg Kroah-Hartman switch (port1->iotype) { 3203ab4382d2SGreg Kroah-Hartman case UPIO_PORT: 3204b8be5db5SJiri Slaby return port1->iobase == port2->iobase; 3205ab4382d2SGreg Kroah-Hartman case UPIO_HUB6: 3206b8be5db5SJiri Slaby return port1->iobase == port2->iobase && 3207b8be5db5SJiri Slaby port1->hub6 == port2->hub6; 3208ab4382d2SGreg Kroah-Hartman case UPIO_MEM: 3209bd94c407SMasahiro Yamada case UPIO_MEM16: 3210ab4382d2SGreg Kroah-Hartman case UPIO_MEM32: 32113ffb1a81SKevin Cernekee case UPIO_MEM32BE: 3212ab4382d2SGreg Kroah-Hartman case UPIO_AU: 3213ab4382d2SGreg Kroah-Hartman case UPIO_TSI: 3214b8be5db5SJiri Slaby return port1->mapbase == port2->mapbase; 3215ab4382d2SGreg Kroah-Hartman } 3216b8be5db5SJiri Slaby 3217b8be5db5SJiri Slaby return false; 3218ab4382d2SGreg Kroah-Hartman } 3219ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_match_port); 3220ab4382d2SGreg Kroah-Hartman 3221027d7dacSJiri Slaby /** 3222027d7dacSJiri Slaby * uart_handle_dcd_change - handle a change of carrier detect state 3223027d7dacSJiri Slaby * @uport: uart_port structure for the open port 3224027d7dacSJiri Slaby * @status: new carrier detect status, nonzero if active 32254d90bb14SPeter Hurley * 32264d90bb14SPeter Hurley * Caller must hold uport->lock 3227027d7dacSJiri Slaby */ 3228027d7dacSJiri Slaby void uart_handle_dcd_change(struct uart_port *uport, unsigned int status) 3229027d7dacSJiri Slaby { 323042381572SGeorge Spelvin struct tty_port *port = &uport->state->port; 323143eca0aeSAlan Cox struct tty_struct *tty = port->tty; 3232c993257bSPeter Hurley struct tty_ldisc *ld; 3233027d7dacSJiri Slaby 32344d90bb14SPeter Hurley lockdep_assert_held_once(&uport->lock); 32354d90bb14SPeter Hurley 3236c993257bSPeter Hurley if (tty) { 3237c993257bSPeter Hurley ld = tty_ldisc_ref(tty); 323842381572SGeorge Spelvin if (ld) { 323942381572SGeorge Spelvin if (ld->ops->dcd_change) 3240593fb1aeSGeorge Spelvin ld->ops->dcd_change(tty, status); 324142381572SGeorge Spelvin tty_ldisc_deref(ld); 324242381572SGeorge Spelvin } 3243c993257bSPeter Hurley } 3244027d7dacSJiri Slaby 3245027d7dacSJiri Slaby uport->icount.dcd++; 3246027d7dacSJiri Slaby 3247299245a1SPeter Hurley if (uart_dcd_enabled(uport)) { 3248027d7dacSJiri Slaby if (status) 3249027d7dacSJiri Slaby wake_up_interruptible(&port->open_wait); 325043eca0aeSAlan Cox else if (tty) 325143eca0aeSAlan Cox tty_hangup(tty); 3252027d7dacSJiri Slaby } 3253027d7dacSJiri Slaby } 3254027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_handle_dcd_change); 3255027d7dacSJiri Slaby 3256027d7dacSJiri Slaby /** 3257027d7dacSJiri Slaby * uart_handle_cts_change - handle a change of clear-to-send state 3258027d7dacSJiri Slaby * @uport: uart_port structure for the open port 3259027d7dacSJiri Slaby * @status: new clear to send status, nonzero if active 32604d90bb14SPeter Hurley * 32614d90bb14SPeter Hurley * Caller must hold uport->lock 3262027d7dacSJiri Slaby */ 3263027d7dacSJiri Slaby void uart_handle_cts_change(struct uart_port *uport, unsigned int status) 3264027d7dacSJiri Slaby { 32654d90bb14SPeter Hurley lockdep_assert_held_once(&uport->lock); 32664d90bb14SPeter Hurley 3267027d7dacSJiri Slaby uport->icount.cts++; 3268027d7dacSJiri Slaby 3269391f93f2SPeter Hurley if (uart_softcts_mode(uport)) { 3270d01f4d18SPeter Hurley if (uport->hw_stopped) { 3271027d7dacSJiri Slaby if (status) { 3272d01f4d18SPeter Hurley uport->hw_stopped = 0; 3273027d7dacSJiri Slaby uport->ops->start_tx(uport); 3274027d7dacSJiri Slaby uart_write_wakeup(uport); 3275027d7dacSJiri Slaby } 3276027d7dacSJiri Slaby } else { 3277027d7dacSJiri Slaby if (!status) { 3278d01f4d18SPeter Hurley uport->hw_stopped = 1; 3279027d7dacSJiri Slaby uport->ops->stop_tx(uport); 3280027d7dacSJiri Slaby } 3281027d7dacSJiri Slaby } 3282391f93f2SPeter Hurley 3283027d7dacSJiri Slaby } 3284027d7dacSJiri Slaby } 3285027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_handle_cts_change); 3286027d7dacSJiri Slaby 3287cf75525fSJiri Slaby /** 3288cf75525fSJiri Slaby * uart_insert_char - push a char to the uart layer 3289cf75525fSJiri Slaby * 3290cf75525fSJiri Slaby * User is responsible to call tty_flip_buffer_push when they are done with 3291cf75525fSJiri Slaby * insertion. 3292cf75525fSJiri Slaby * 3293cf75525fSJiri Slaby * @port: corresponding port 3294cf75525fSJiri Slaby * @status: state of the serial port RX buffer (LSR for 8250) 3295cf75525fSJiri Slaby * @overrun: mask of overrun bits in @status 3296cf75525fSJiri Slaby * @ch: character to push 3297cf75525fSJiri Slaby * @flag: flag for the character (see TTY_NORMAL and friends) 3298cf75525fSJiri Slaby */ 3299027d7dacSJiri Slaby void uart_insert_char(struct uart_port *port, unsigned int status, 3300027d7dacSJiri Slaby unsigned int overrun, unsigned int ch, unsigned int flag) 3301027d7dacSJiri Slaby { 330292a19f9cSJiri Slaby struct tty_port *tport = &port->state->port; 3303027d7dacSJiri Slaby 3304027d7dacSJiri Slaby if ((status & port->ignore_status_mask & ~overrun) == 0) 330592a19f9cSJiri Slaby if (tty_insert_flip_char(tport, ch, flag) == 0) 3306dabfb351SCorbin ++port->icount.buf_overrun; 3307027d7dacSJiri Slaby 3308027d7dacSJiri Slaby /* 3309027d7dacSJiri Slaby * Overrun is special. Since it's reported immediately, 3310027d7dacSJiri Slaby * it doesn't affect the current character. 3311027d7dacSJiri Slaby */ 3312027d7dacSJiri Slaby if (status & ~port->ignore_status_mask & overrun) 331392a19f9cSJiri Slaby if (tty_insert_flip_char(tport, 0, TTY_OVERRUN) == 0) 3314dabfb351SCorbin ++port->icount.buf_overrun; 3315027d7dacSJiri Slaby } 3316027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_insert_char); 3317027d7dacSJiri Slaby 331868af4317SDmitry Safonov #ifdef CONFIG_MAGIC_SYSRQ_SERIAL 331968af4317SDmitry Safonov static const char sysrq_toggle_seq[] = CONFIG_MAGIC_SYSRQ_SERIAL_SEQUENCE; 332068af4317SDmitry Safonov 332168af4317SDmitry Safonov static void uart_sysrq_on(struct work_struct *w) 332268af4317SDmitry Safonov { 3323b18896ffSAndy Shevchenko int sysrq_toggle_seq_len = strlen(sysrq_toggle_seq); 3324b18896ffSAndy Shevchenko 332568af4317SDmitry Safonov sysrq_toggle_support(1); 3326b18896ffSAndy Shevchenko pr_info("SysRq is enabled by magic sequence '%*pE' on serial\n", 3327b18896ffSAndy Shevchenko sysrq_toggle_seq_len, sysrq_toggle_seq); 332868af4317SDmitry Safonov } 332968af4317SDmitry Safonov static DECLARE_WORK(sysrq_enable_work, uart_sysrq_on); 333068af4317SDmitry Safonov 333168af4317SDmitry Safonov /** 333268af4317SDmitry Safonov * uart_try_toggle_sysrq - Enables SysRq from serial line 333368af4317SDmitry Safonov * @port: uart_port structure where char(s) after BREAK met 333468af4317SDmitry Safonov * @ch: new character in the sequence after received BREAK 333568af4317SDmitry Safonov * 333668af4317SDmitry Safonov * Enables magic SysRq when the required sequence is met on port 333768af4317SDmitry Safonov * (see CONFIG_MAGIC_SYSRQ_SERIAL_SEQUENCE). 333868af4317SDmitry Safonov * 333968af4317SDmitry Safonov * Returns false if @ch is out of enabling sequence and should be 334068af4317SDmitry Safonov * handled some other way, true if @ch was consumed. 334168af4317SDmitry Safonov */ 334208d54703SJohan Hovold bool uart_try_toggle_sysrq(struct uart_port *port, unsigned int ch) 334368af4317SDmitry Safonov { 33442ce5eaceSAndy Shevchenko int sysrq_toggle_seq_len = strlen(sysrq_toggle_seq); 33452ce5eaceSAndy Shevchenko 33462ce5eaceSAndy Shevchenko if (!sysrq_toggle_seq_len) 334768af4317SDmitry Safonov return false; 334868af4317SDmitry Safonov 334968af4317SDmitry Safonov BUILD_BUG_ON(ARRAY_SIZE(sysrq_toggle_seq) >= U8_MAX); 335068af4317SDmitry Safonov if (sysrq_toggle_seq[port->sysrq_seq] != ch) { 335168af4317SDmitry Safonov port->sysrq_seq = 0; 335268af4317SDmitry Safonov return false; 335368af4317SDmitry Safonov } 335468af4317SDmitry Safonov 33552ce5eaceSAndy Shevchenko if (++port->sysrq_seq < sysrq_toggle_seq_len) { 335668af4317SDmitry Safonov port->sysrq = jiffies + SYSRQ_TIMEOUT; 335768af4317SDmitry Safonov return true; 335868af4317SDmitry Safonov } 335968af4317SDmitry Safonov 336068af4317SDmitry Safonov schedule_work(&sysrq_enable_work); 336168af4317SDmitry Safonov 336268af4317SDmitry Safonov port->sysrq = 0; 336368af4317SDmitry Safonov return true; 336468af4317SDmitry Safonov } 336508d54703SJohan Hovold EXPORT_SYMBOL_GPL(uart_try_toggle_sysrq); 336668af4317SDmitry Safonov #endif 336768af4317SDmitry Safonov 3368ef838a81SUwe Kleine-König /** 3369743f93f8SLukas Wunner * uart_get_rs485_mode() - retrieve rs485 properties for given uart 3370a7172561SRandy Dunlap * @port: uart device's target port 3371ef838a81SUwe Kleine-König * 3372ef838a81SUwe Kleine-König * This function implements the device tree binding described in 3373ef838a81SUwe Kleine-König * Documentation/devicetree/bindings/serial/rs485.txt. 3374ef838a81SUwe Kleine-König */ 3375c150c0f3SLukas Wunner int uart_get_rs485_mode(struct uart_port *port) 3376ef838a81SUwe Kleine-König { 3377c150c0f3SLukas Wunner struct serial_rs485 *rs485conf = &port->rs485; 3378c150c0f3SLukas Wunner struct device *dev = port->dev; 3379ef838a81SUwe Kleine-König u32 rs485_delay[2]; 3380ef838a81SUwe Kleine-König int ret; 3381ef838a81SUwe Kleine-König 3382743f93f8SLukas Wunner ret = device_property_read_u32_array(dev, "rs485-rts-delay", 3383743f93f8SLukas Wunner rs485_delay, 2); 3384ef838a81SUwe Kleine-König if (!ret) { 3385ef838a81SUwe Kleine-König rs485conf->delay_rts_before_send = rs485_delay[0]; 3386ef838a81SUwe Kleine-König rs485conf->delay_rts_after_send = rs485_delay[1]; 3387ef838a81SUwe Kleine-König } else { 3388ef838a81SUwe Kleine-König rs485conf->delay_rts_before_send = 0; 3389ef838a81SUwe Kleine-König rs485conf->delay_rts_after_send = 0; 3390ef838a81SUwe Kleine-König } 3391ef838a81SUwe Kleine-König 3392ef838a81SUwe Kleine-König /* 3393f1e5b618SLukas Wunner * Clear full-duplex and enabled flags, set RTS polarity to active high 3394f1e5b618SLukas Wunner * to get to a defined state with the following properties: 3395ef838a81SUwe Kleine-König */ 3396f1e5b618SLukas Wunner rs485conf->flags &= ~(SER_RS485_RX_DURING_TX | SER_RS485_ENABLED | 3397d58a2df3SLukas Wunner SER_RS485_TERMINATE_BUS | 3398f1e5b618SLukas Wunner SER_RS485_RTS_AFTER_SEND); 3399f1e5b618SLukas Wunner rs485conf->flags |= SER_RS485_RTS_ON_SEND; 3400ef838a81SUwe Kleine-König 3401743f93f8SLukas Wunner if (device_property_read_bool(dev, "rs485-rx-during-tx")) 3402ef838a81SUwe Kleine-König rs485conf->flags |= SER_RS485_RX_DURING_TX; 3403ef838a81SUwe Kleine-König 3404743f93f8SLukas Wunner if (device_property_read_bool(dev, "linux,rs485-enabled-at-boot-time")) 3405ef838a81SUwe Kleine-König rs485conf->flags |= SER_RS485_ENABLED; 3406f1e5b618SLukas Wunner 3407f1e5b618SLukas Wunner if (device_property_read_bool(dev, "rs485-rts-active-low")) { 3408f1e5b618SLukas Wunner rs485conf->flags &= ~SER_RS485_RTS_ON_SEND; 3409f1e5b618SLukas Wunner rs485conf->flags |= SER_RS485_RTS_AFTER_SEND; 3410f1e5b618SLukas Wunner } 3411c150c0f3SLukas Wunner 3412d58a2df3SLukas Wunner /* 3413d58a2df3SLukas Wunner * Disabling termination by default is the safe choice: Else if many 3414d58a2df3SLukas Wunner * bus participants enable it, no communication is possible at all. 3415d58a2df3SLukas Wunner * Works fine for short cables and users may enable for longer cables. 3416d58a2df3SLukas Wunner */ 3417d58a2df3SLukas Wunner port->rs485_term_gpio = devm_gpiod_get_optional(dev, "rs485-term", 3418d58a2df3SLukas Wunner GPIOD_OUT_LOW); 3419d58a2df3SLukas Wunner if (IS_ERR(port->rs485_term_gpio)) { 3420d58a2df3SLukas Wunner ret = PTR_ERR(port->rs485_term_gpio); 3421d58a2df3SLukas Wunner port->rs485_term_gpio = NULL; 342289c65d66SKrzysztof Kozlowski return dev_err_probe(dev, ret, "Cannot get rs485-term-gpios\n"); 3423d58a2df3SLukas Wunner } 34248bec874fSIlpo Järvinen if (port->rs485_term_gpio) 34258bec874fSIlpo Järvinen port->rs485_supported.flags |= SER_RS485_TERMINATE_BUS; 3426d58a2df3SLukas Wunner 3427c150c0f3SLukas Wunner return 0; 3428ef838a81SUwe Kleine-König } 3429743f93f8SLukas Wunner EXPORT_SYMBOL_GPL(uart_get_rs485_mode); 3430ef838a81SUwe Kleine-König 34314f768e94SIlpo Järvinen /* Compile-time assertions for serial_rs485 layout */ 34324f768e94SIlpo Järvinen static_assert(offsetof(struct serial_rs485, padding) == 34334f768e94SIlpo Järvinen (offsetof(struct serial_rs485, delay_rts_after_send) + sizeof(__u32))); 34344f768e94SIlpo Järvinen static_assert(offsetof(struct serial_rs485, padding1) == 34354f768e94SIlpo Järvinen offsetof(struct serial_rs485, padding[1])); 34364f768e94SIlpo Järvinen static_assert((offsetof(struct serial_rs485, padding[4]) + sizeof(__u32)) == 34374f768e94SIlpo Järvinen sizeof(struct serial_rs485)); 34384f768e94SIlpo Järvinen 3439ab4382d2SGreg Kroah-Hartman MODULE_DESCRIPTION("Serial driver core"); 3440ab4382d2SGreg Kroah-Hartman MODULE_LICENSE("GPL"); 3441