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 /** 330ab4382d2SGreg Kroah-Hartman * uart_update_timeout - update per-port FIFO timeout. 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 * 335ab4382d2SGreg Kroah-Hartman * Set the port FIFO timeout value. The @cflag value should 336ab4382d2SGreg Kroah-Hartman * reflect the actual hardware settings. 337ab4382d2SGreg Kroah-Hartman */ 338ab4382d2SGreg Kroah-Hartman void 339ab4382d2SGreg Kroah-Hartman uart_update_timeout(struct uart_port *port, unsigned int cflag, 340ab4382d2SGreg Kroah-Hartman unsigned int baud) 341ab4382d2SGreg Kroah-Hartman { 34231f6bd7fSIlpo Järvinen unsigned int size = tty_get_frame_size(cflag); 34331f6bd7fSIlpo Järvinen u64 frame_time; 344ab4382d2SGreg Kroah-Hartman 34531f6bd7fSIlpo Järvinen frame_time = (u64)size * NSEC_PER_SEC; 34631f6bd7fSIlpo Järvinen size *= port->fifosize; 347ab4382d2SGreg Kroah-Hartman 348ab4382d2SGreg Kroah-Hartman /* 349ab4382d2SGreg Kroah-Hartman * Figure the timeout to send the above number of bits. 350ab4382d2SGreg Kroah-Hartman * Add .02 seconds of slop 351ab4382d2SGreg Kroah-Hartman */ 352654ee49bSJiri Slaby port->timeout = (HZ * size) / baud + HZ/50; 35331f6bd7fSIlpo Järvinen port->frame_time = DIV64_U64_ROUND_UP(frame_time, baud); 354ab4382d2SGreg Kroah-Hartman } 355ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_update_timeout); 356ab4382d2SGreg Kroah-Hartman 357ab4382d2SGreg Kroah-Hartman /** 358ab4382d2SGreg Kroah-Hartman * uart_get_baud_rate - return baud rate for a particular port 359ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port in question. 360ab4382d2SGreg Kroah-Hartman * @termios: desired termios settings. 361ab4382d2SGreg Kroah-Hartman * @old: old termios (or NULL) 362ab4382d2SGreg Kroah-Hartman * @min: minimum acceptable baud rate 363ab4382d2SGreg Kroah-Hartman * @max: maximum acceptable baud rate 364ab4382d2SGreg Kroah-Hartman * 365ab4382d2SGreg Kroah-Hartman * Decode the termios structure into a numeric baud rate, 366ab4382d2SGreg Kroah-Hartman * taking account of the magic 38400 baud rate (with spd_* 367ab4382d2SGreg Kroah-Hartman * flags), and mapping the %B0 rate to 9600 baud. 368ab4382d2SGreg Kroah-Hartman * 369ab4382d2SGreg Kroah-Hartman * If the new baud rate is invalid, try the old termios setting. 370ab4382d2SGreg Kroah-Hartman * If it's still invalid, we try 9600 baud. 371ab4382d2SGreg Kroah-Hartman * 372ab4382d2SGreg Kroah-Hartman * Update the @termios structure to reflect the baud rate 373ab4382d2SGreg Kroah-Hartman * we're actually going to be using. Don't do this for the case 374ab4382d2SGreg Kroah-Hartman * where B0 is requested ("hang up"). 375ab4382d2SGreg Kroah-Hartman */ 376ab4382d2SGreg Kroah-Hartman unsigned int 377ab4382d2SGreg Kroah-Hartman uart_get_baud_rate(struct uart_port *port, struct ktermios *termios, 378ab4382d2SGreg Kroah-Hartman struct ktermios *old, unsigned int min, unsigned int max) 379ab4382d2SGreg Kroah-Hartman { 380f10a2233SJoakim Nordell unsigned int try; 381f10a2233SJoakim Nordell unsigned int baud; 382f10a2233SJoakim Nordell unsigned int altbaud; 383ab4382d2SGreg Kroah-Hartman int hung_up = 0; 384ab4382d2SGreg Kroah-Hartman upf_t flags = port->flags & UPF_SPD_MASK; 385ab4382d2SGreg Kroah-Hartman 386f10a2233SJoakim Nordell switch (flags) { 387f10a2233SJoakim Nordell case UPF_SPD_HI: 388ab4382d2SGreg Kroah-Hartman altbaud = 57600; 389f10a2233SJoakim Nordell break; 390f10a2233SJoakim Nordell case UPF_SPD_VHI: 391ab4382d2SGreg Kroah-Hartman altbaud = 115200; 392f10a2233SJoakim Nordell break; 393f10a2233SJoakim Nordell case UPF_SPD_SHI: 394ab4382d2SGreg Kroah-Hartman altbaud = 230400; 395f10a2233SJoakim Nordell break; 396f10a2233SJoakim Nordell case UPF_SPD_WARP: 397ab4382d2SGreg Kroah-Hartman altbaud = 460800; 398f10a2233SJoakim Nordell break; 399f10a2233SJoakim Nordell default: 400f10a2233SJoakim Nordell altbaud = 38400; 401f10a2233SJoakim Nordell break; 402f10a2233SJoakim Nordell } 403ab4382d2SGreg Kroah-Hartman 404ab4382d2SGreg Kroah-Hartman for (try = 0; try < 2; try++) { 405ab4382d2SGreg Kroah-Hartman baud = tty_termios_baud_rate(termios); 406ab4382d2SGreg Kroah-Hartman 407ab4382d2SGreg Kroah-Hartman /* 408ab4382d2SGreg Kroah-Hartman * The spd_hi, spd_vhi, spd_shi, spd_warp kludge... 409ab4382d2SGreg Kroah-Hartman * Die! Die! Die! 410ab4382d2SGreg Kroah-Hartman */ 411547039ecSPeter Hurley if (try == 0 && baud == 38400) 412ab4382d2SGreg Kroah-Hartman baud = altbaud; 413ab4382d2SGreg Kroah-Hartman 414ab4382d2SGreg Kroah-Hartman /* 415ab4382d2SGreg Kroah-Hartman * Special case: B0 rate. 416ab4382d2SGreg Kroah-Hartman */ 417ab4382d2SGreg Kroah-Hartman if (baud == 0) { 418ab4382d2SGreg Kroah-Hartman hung_up = 1; 419ab4382d2SGreg Kroah-Hartman baud = 9600; 420ab4382d2SGreg Kroah-Hartman } 421ab4382d2SGreg Kroah-Hartman 422ab4382d2SGreg Kroah-Hartman if (baud >= min && baud <= max) 423ab4382d2SGreg Kroah-Hartman return baud; 424ab4382d2SGreg Kroah-Hartman 425ab4382d2SGreg Kroah-Hartman /* 426ab4382d2SGreg Kroah-Hartman * Oops, the quotient was zero. Try again with 427ab4382d2SGreg Kroah-Hartman * the old baud rate if possible. 428ab4382d2SGreg Kroah-Hartman */ 429ab4382d2SGreg Kroah-Hartman termios->c_cflag &= ~CBAUD; 430ab4382d2SGreg Kroah-Hartman if (old) { 431ab4382d2SGreg Kroah-Hartman baud = tty_termios_baud_rate(old); 432ab4382d2SGreg Kroah-Hartman if (!hung_up) 433ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 434ab4382d2SGreg Kroah-Hartman baud, baud); 435ab4382d2SGreg Kroah-Hartman old = NULL; 436ab4382d2SGreg Kroah-Hartman continue; 437ab4382d2SGreg Kroah-Hartman } 438ab4382d2SGreg Kroah-Hartman 439ab4382d2SGreg Kroah-Hartman /* 440ab4382d2SGreg Kroah-Hartman * As a last resort, if the range cannot be met then clip to 441ab4382d2SGreg Kroah-Hartman * the nearest chip supported rate. 442ab4382d2SGreg Kroah-Hartman */ 443ab4382d2SGreg Kroah-Hartman if (!hung_up) { 444ab4382d2SGreg Kroah-Hartman if (baud <= min) 445ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 446ab4382d2SGreg Kroah-Hartman min + 1, min + 1); 447ab4382d2SGreg Kroah-Hartman else 448ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 449ab4382d2SGreg Kroah-Hartman max - 1, max - 1); 450ab4382d2SGreg Kroah-Hartman } 451ab4382d2SGreg Kroah-Hartman } 452ab4382d2SGreg Kroah-Hartman /* Should never happen */ 453ab4382d2SGreg Kroah-Hartman WARN_ON(1); 454ab4382d2SGreg Kroah-Hartman return 0; 455ab4382d2SGreg Kroah-Hartman } 456ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_get_baud_rate); 457ab4382d2SGreg Kroah-Hartman 458ab4382d2SGreg Kroah-Hartman /** 459ab4382d2SGreg Kroah-Hartman * uart_get_divisor - return uart clock divisor 460ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port. 461ab4382d2SGreg Kroah-Hartman * @baud: desired baud rate 462ab4382d2SGreg Kroah-Hartman * 463ab4382d2SGreg Kroah-Hartman * Calculate the uart clock divisor for the port. 464ab4382d2SGreg Kroah-Hartman */ 465ab4382d2SGreg Kroah-Hartman unsigned int 466ab4382d2SGreg Kroah-Hartman uart_get_divisor(struct uart_port *port, unsigned int baud) 467ab4382d2SGreg Kroah-Hartman { 468ab4382d2SGreg Kroah-Hartman unsigned int quot; 469ab4382d2SGreg Kroah-Hartman 470ab4382d2SGreg Kroah-Hartman /* 471ab4382d2SGreg Kroah-Hartman * Old custom speed handling. 472ab4382d2SGreg Kroah-Hartman */ 473ab4382d2SGreg Kroah-Hartman if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) 474ab4382d2SGreg Kroah-Hartman quot = port->custom_divisor; 475ab4382d2SGreg Kroah-Hartman else 47697d24634SUwe Kleine-König quot = DIV_ROUND_CLOSEST(port->uartclk, 16 * baud); 477ab4382d2SGreg Kroah-Hartman 478ab4382d2SGreg Kroah-Hartman return quot; 479ab4382d2SGreg Kroah-Hartman } 480ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_get_divisor); 481ab4382d2SGreg Kroah-Hartman 4827c8ab967SPeter Hurley /* Caller holds port mutex */ 483ab4382d2SGreg Kroah-Hartman static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, 484ab4382d2SGreg Kroah-Hartman struct ktermios *old_termios) 485ab4382d2SGreg Kroah-Hartman { 4864047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 487ab4382d2SGreg Kroah-Hartman struct ktermios *termios; 488391f93f2SPeter Hurley int hw_stopped; 489ab4382d2SGreg Kroah-Hartman 490ab4382d2SGreg Kroah-Hartman /* 491ab4382d2SGreg Kroah-Hartman * If we have no tty, termios, or the port does not exist, 492ab4382d2SGreg Kroah-Hartman * then we can't set the parameters for this port. 493ab4382d2SGreg Kroah-Hartman */ 494adc8d746SAlan Cox if (!tty || uport->type == PORT_UNKNOWN) 495ab4382d2SGreg Kroah-Hartman return; 496ab4382d2SGreg Kroah-Hartman 497adc8d746SAlan Cox termios = &tty->termios; 498c18b55fdSPeter Hurley uport->ops->set_termios(uport, termios, old_termios); 499ab4382d2SGreg Kroah-Hartman 500ab4382d2SGreg Kroah-Hartman /* 501299245a1SPeter Hurley * Set modem status enables based on termios cflag 502ab4382d2SGreg Kroah-Hartman */ 503299245a1SPeter Hurley spin_lock_irq(&uport->lock); 504ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CRTSCTS) 505299245a1SPeter Hurley uport->status |= UPSTAT_CTS_ENABLE; 506ab4382d2SGreg Kroah-Hartman else 507299245a1SPeter Hurley uport->status &= ~UPSTAT_CTS_ENABLE; 508ab4382d2SGreg Kroah-Hartman 509ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CLOCAL) 510299245a1SPeter Hurley uport->status &= ~UPSTAT_DCD_ENABLE; 511ab4382d2SGreg Kroah-Hartman else 512299245a1SPeter Hurley uport->status |= UPSTAT_DCD_ENABLE; 513391f93f2SPeter Hurley 514391f93f2SPeter Hurley /* reset sw-assisted CTS flow control based on (possibly) new mode */ 515391f93f2SPeter Hurley hw_stopped = uport->hw_stopped; 516391f93f2SPeter Hurley uport->hw_stopped = uart_softcts_mode(uport) && 517391f93f2SPeter Hurley !(uport->ops->get_mctrl(uport) & TIOCM_CTS); 518391f93f2SPeter Hurley if (uport->hw_stopped) { 519391f93f2SPeter Hurley if (!hw_stopped) 520391f93f2SPeter Hurley uport->ops->stop_tx(uport); 521391f93f2SPeter Hurley } else { 522391f93f2SPeter Hurley if (hw_stopped) 523391f93f2SPeter Hurley __uart_start(tty); 524391f93f2SPeter Hurley } 525299245a1SPeter Hurley spin_unlock_irq(&uport->lock); 526ab4382d2SGreg Kroah-Hartman } 527ab4382d2SGreg Kroah-Hartman 528f5291eccSPeter Hurley static int uart_put_char(struct tty_struct *tty, unsigned char c) 529ab4382d2SGreg Kroah-Hartman { 530f5291eccSPeter Hurley struct uart_state *state = tty->driver_data; 5319ed19428SPeter Hurley struct uart_port *port; 532f5291eccSPeter Hurley struct circ_buf *circ; 533ab4382d2SGreg Kroah-Hartman unsigned long flags; 534ab4382d2SGreg Kroah-Hartman int ret = 0; 535ab4382d2SGreg Kroah-Hartman 536f5291eccSPeter Hurley circ = &state->xmit; 5379ed19428SPeter Hurley port = uart_port_lock(state, flags); 538aff9cf59SSamir Virmani if (!circ->buf) { 539aff9cf59SSamir Virmani uart_port_unlock(port, flags); 540aff9cf59SSamir Virmani return 0; 541aff9cf59SSamir Virmani } 542aff9cf59SSamir Virmani 5439ed19428SPeter Hurley if (port && uart_circ_chars_free(circ) != 0) { 544ab4382d2SGreg Kroah-Hartman circ->buf[circ->head] = c; 545ab4382d2SGreg Kroah-Hartman circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1); 546ab4382d2SGreg Kroah-Hartman ret = 1; 547ab4382d2SGreg Kroah-Hartman } 5489ed19428SPeter Hurley uart_port_unlock(port, flags); 549ab4382d2SGreg Kroah-Hartman return ret; 550ab4382d2SGreg Kroah-Hartman } 551ab4382d2SGreg Kroah-Hartman 552ab4382d2SGreg Kroah-Hartman static void uart_flush_chars(struct tty_struct *tty) 553ab4382d2SGreg Kroah-Hartman { 554ab4382d2SGreg Kroah-Hartman uart_start(tty); 555ab4382d2SGreg Kroah-Hartman } 556ab4382d2SGreg Kroah-Hartman 557ab4382d2SGreg Kroah-Hartman static int uart_write(struct tty_struct *tty, 558ab4382d2SGreg Kroah-Hartman const unsigned char *buf, int count) 559ab4382d2SGreg Kroah-Hartman { 560ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 561ab4382d2SGreg Kroah-Hartman struct uart_port *port; 562ab4382d2SGreg Kroah-Hartman struct circ_buf *circ; 563ab4382d2SGreg Kroah-Hartman unsigned long flags; 564ab4382d2SGreg Kroah-Hartman int c, ret = 0; 565ab4382d2SGreg Kroah-Hartman 566ab4382d2SGreg Kroah-Hartman /* 567ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 568ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 569ab4382d2SGreg Kroah-Hartman */ 570ab4382d2SGreg Kroah-Hartman if (!state) { 571ab4382d2SGreg Kroah-Hartman WARN_ON(1); 572ab4382d2SGreg Kroah-Hartman return -EL3HLT; 573ab4382d2SGreg Kroah-Hartman } 574ab4382d2SGreg Kroah-Hartman 5759ed19428SPeter Hurley port = uart_port_lock(state, flags); 576aff9cf59SSamir Virmani circ = &state->xmit; 577aff9cf59SSamir Virmani if (!circ->buf) { 578aff9cf59SSamir Virmani uart_port_unlock(port, flags); 579aff9cf59SSamir Virmani return 0; 580aff9cf59SSamir Virmani } 581aff9cf59SSamir Virmani 5829ed19428SPeter Hurley while (port) { 583ab4382d2SGreg Kroah-Hartman c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE); 584ab4382d2SGreg Kroah-Hartman if (count < c) 585ab4382d2SGreg Kroah-Hartman c = count; 586ab4382d2SGreg Kroah-Hartman if (c <= 0) 587ab4382d2SGreg Kroah-Hartman break; 588ab4382d2SGreg Kroah-Hartman memcpy(circ->buf + circ->head, buf, c); 589ab4382d2SGreg Kroah-Hartman circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1); 590ab4382d2SGreg Kroah-Hartman buf += c; 591ab4382d2SGreg Kroah-Hartman count -= c; 592ab4382d2SGreg Kroah-Hartman ret += c; 593ab4382d2SGreg Kroah-Hartman } 59464dbee31SPeter Hurley 59564dbee31SPeter Hurley __uart_start(tty); 5969ed19428SPeter Hurley uart_port_unlock(port, flags); 597ab4382d2SGreg Kroah-Hartman return ret; 598ab4382d2SGreg Kroah-Hartman } 599ab4382d2SGreg Kroah-Hartman 60003b3b1a2SJiri Slaby static unsigned int uart_write_room(struct tty_struct *tty) 601ab4382d2SGreg Kroah-Hartman { 602ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 6039ed19428SPeter Hurley struct uart_port *port; 604ab4382d2SGreg Kroah-Hartman unsigned long flags; 60503b3b1a2SJiri Slaby unsigned int ret; 606ab4382d2SGreg Kroah-Hartman 6079ed19428SPeter Hurley port = uart_port_lock(state, flags); 608ab4382d2SGreg Kroah-Hartman ret = uart_circ_chars_free(&state->xmit); 6099ed19428SPeter Hurley uart_port_unlock(port, flags); 610ab4382d2SGreg Kroah-Hartman return ret; 611ab4382d2SGreg Kroah-Hartman } 612ab4382d2SGreg Kroah-Hartman 613fff4ef17SJiri Slaby static unsigned int uart_chars_in_buffer(struct tty_struct *tty) 614ab4382d2SGreg Kroah-Hartman { 615ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 6169ed19428SPeter Hurley struct uart_port *port; 617ab4382d2SGreg Kroah-Hartman unsigned long flags; 618fff4ef17SJiri Slaby unsigned int ret; 619ab4382d2SGreg Kroah-Hartman 6209ed19428SPeter Hurley port = uart_port_lock(state, flags); 621ab4382d2SGreg Kroah-Hartman ret = uart_circ_chars_pending(&state->xmit); 6229ed19428SPeter Hurley uart_port_unlock(port, flags); 623ab4382d2SGreg Kroah-Hartman return ret; 624ab4382d2SGreg Kroah-Hartman } 625ab4382d2SGreg Kroah-Hartman 626ab4382d2SGreg Kroah-Hartman static void uart_flush_buffer(struct tty_struct *tty) 627ab4382d2SGreg Kroah-Hartman { 628ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 629ab4382d2SGreg Kroah-Hartman struct uart_port *port; 630ab4382d2SGreg Kroah-Hartman unsigned long flags; 631ab4382d2SGreg Kroah-Hartman 632ab4382d2SGreg Kroah-Hartman /* 633ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 634ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 635ab4382d2SGreg Kroah-Hartman */ 636ab4382d2SGreg Kroah-Hartman if (!state) { 637ab4382d2SGreg Kroah-Hartman WARN_ON(1); 638ab4382d2SGreg Kroah-Hartman return; 639ab4382d2SGreg Kroah-Hartman } 640ab4382d2SGreg Kroah-Hartman 641ab4382d2SGreg Kroah-Hartman pr_debug("uart_flush_buffer(%d) called\n", tty->index); 642ab4382d2SGreg Kroah-Hartman 6439ed19428SPeter Hurley port = uart_port_lock(state, flags); 6449ed19428SPeter Hurley if (!port) 6459ed19428SPeter Hurley return; 646ab4382d2SGreg Kroah-Hartman uart_circ_clear(&state->xmit); 647ab4382d2SGreg Kroah-Hartman if (port->ops->flush_buffer) 648ab4382d2SGreg Kroah-Hartman port->ops->flush_buffer(port); 6499ed19428SPeter Hurley uart_port_unlock(port, flags); 650d0f4bce2SRob Herring tty_port_tty_wakeup(&state->port); 651ab4382d2SGreg Kroah-Hartman } 652ab4382d2SGreg Kroah-Hartman 653ab4382d2SGreg Kroah-Hartman /* 654f58c252eSIlpo Järvinen * This function performs low-level write of high-priority XON/XOFF 655f58c252eSIlpo Järvinen * character and accounting for it. 656f58c252eSIlpo Järvinen * 657f58c252eSIlpo Järvinen * Requires uart_port to implement .serial_out(). 658f58c252eSIlpo Järvinen */ 659f58c252eSIlpo Järvinen void uart_xchar_out(struct uart_port *uport, int offset) 660f58c252eSIlpo Järvinen { 661f58c252eSIlpo Järvinen serial_port_out(uport, offset, uport->x_char); 662f58c252eSIlpo Järvinen uport->icount.tx++; 663f58c252eSIlpo Järvinen uport->x_char = 0; 664f58c252eSIlpo Järvinen } 665f58c252eSIlpo Järvinen EXPORT_SYMBOL_GPL(uart_xchar_out); 666f58c252eSIlpo Järvinen 667f58c252eSIlpo Järvinen /* 668ab4382d2SGreg Kroah-Hartman * This function is used to send a high-priority XON/XOFF character to 669ab4382d2SGreg Kroah-Hartman * the device 670ab4382d2SGreg Kroah-Hartman */ 671ab4382d2SGreg Kroah-Hartman static void uart_send_xchar(struct tty_struct *tty, char ch) 672ab4382d2SGreg Kroah-Hartman { 673ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 6749ed19428SPeter Hurley struct uart_port *port; 675ab4382d2SGreg Kroah-Hartman unsigned long flags; 676ab4382d2SGreg Kroah-Hartman 6779ed19428SPeter Hurley port = uart_port_ref(state); 6789ed19428SPeter Hurley if (!port) 6799ed19428SPeter Hurley return; 6809ed19428SPeter Hurley 681ab4382d2SGreg Kroah-Hartman if (port->ops->send_xchar) 682ab4382d2SGreg Kroah-Hartman port->ops->send_xchar(port, ch); 683ab4382d2SGreg Kroah-Hartman else { 684ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 685c235ccc1SPeter Hurley port->x_char = ch; 686c235ccc1SPeter Hurley if (ch) 687ab4382d2SGreg Kroah-Hartman port->ops->start_tx(port); 688ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 689ab4382d2SGreg Kroah-Hartman } 6909ed19428SPeter Hurley uart_port_deref(port); 691ab4382d2SGreg Kroah-Hartman } 692ab4382d2SGreg Kroah-Hartman 693ab4382d2SGreg Kroah-Hartman static void uart_throttle(struct tty_struct *tty) 694ab4382d2SGreg Kroah-Hartman { 695ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 696c5f78b1fSJeremy Kerr upstat_t mask = UPSTAT_SYNC_FIFO; 6979ed19428SPeter Hurley struct uart_port *port; 698ab4382d2SGreg Kroah-Hartman 6999ed19428SPeter Hurley port = uart_port_ref(state); 7009ed19428SPeter Hurley if (!port) 7019ed19428SPeter Hurley return; 7029ed19428SPeter Hurley 703ab4382d2SGreg Kroah-Hartman if (I_IXOFF(tty)) 704391f93f2SPeter Hurley mask |= UPSTAT_AUTOXOFF; 7059db276f8SPeter Hurley if (C_CRTSCTS(tty)) 706391f93f2SPeter Hurley mask |= UPSTAT_AUTORTS; 7079aba8d5bSRussell King 708391f93f2SPeter Hurley if (port->status & mask) { 7099aba8d5bSRussell King port->ops->throttle(port); 710391f93f2SPeter Hurley mask &= ~port->status; 7119aba8d5bSRussell King } 7129aba8d5bSRussell King 713391f93f2SPeter Hurley if (mask & UPSTAT_AUTORTS) 7149aba8d5bSRussell King uart_clear_mctrl(port, TIOCM_RTS); 715b4749b97SPeter Hurley 716b4749b97SPeter Hurley if (mask & UPSTAT_AUTOXOFF) 717b4749b97SPeter Hurley uart_send_xchar(tty, STOP_CHAR(tty)); 7189ed19428SPeter Hurley 7199ed19428SPeter Hurley uart_port_deref(port); 720ab4382d2SGreg Kroah-Hartman } 721ab4382d2SGreg Kroah-Hartman 722ab4382d2SGreg Kroah-Hartman static void uart_unthrottle(struct tty_struct *tty) 723ab4382d2SGreg Kroah-Hartman { 724ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 725c5f78b1fSJeremy Kerr upstat_t mask = UPSTAT_SYNC_FIFO; 7269ed19428SPeter Hurley struct uart_port *port; 727ab4382d2SGreg Kroah-Hartman 7289ed19428SPeter Hurley port = uart_port_ref(state); 7299ed19428SPeter Hurley if (!port) 7309ed19428SPeter Hurley return; 7319ed19428SPeter Hurley 7329aba8d5bSRussell King if (I_IXOFF(tty)) 733391f93f2SPeter Hurley mask |= UPSTAT_AUTOXOFF; 7349db276f8SPeter Hurley if (C_CRTSCTS(tty)) 735391f93f2SPeter Hurley mask |= UPSTAT_AUTORTS; 7369aba8d5bSRussell King 737391f93f2SPeter Hurley if (port->status & mask) { 7389aba8d5bSRussell King port->ops->unthrottle(port); 739391f93f2SPeter Hurley mask &= ~port->status; 7409aba8d5bSRussell King } 7419aba8d5bSRussell King 742391f93f2SPeter Hurley if (mask & UPSTAT_AUTORTS) 743ab4382d2SGreg Kroah-Hartman uart_set_mctrl(port, TIOCM_RTS); 744b4749b97SPeter Hurley 745b4749b97SPeter Hurley if (mask & UPSTAT_AUTOXOFF) 746b4749b97SPeter Hurley uart_send_xchar(tty, START_CHAR(tty)); 7479ed19428SPeter Hurley 7489ed19428SPeter Hurley uart_port_deref(port); 749ab4382d2SGreg Kroah-Hartman } 750ab4382d2SGreg Kroah-Hartman 7514047b371SPeter Hurley static int uart_get_info(struct tty_port *port, struct serial_struct *retinfo) 752ab4382d2SGreg Kroah-Hartman { 7539f109694SAlan Cox struct uart_state *state = container_of(port, struct uart_state, port); 7544047b371SPeter Hurley struct uart_port *uport; 7554047b371SPeter Hurley int ret = -ENODEV; 7567ba2e769SAlan Cox 7573abe8c76SPeter Hurley /* 7583abe8c76SPeter Hurley * Ensure the state we copy is consistent and no hardware changes 7593abe8c76SPeter Hurley * occur as we go 7603abe8c76SPeter Hurley */ 7613abe8c76SPeter Hurley mutex_lock(&port->mutex); 7624047b371SPeter Hurley uport = uart_port_check(state); 7634047b371SPeter Hurley if (!uport) 7644047b371SPeter Hurley goto out; 7654047b371SPeter Hurley 7667ba2e769SAlan Cox retinfo->type = uport->type; 7677ba2e769SAlan Cox retinfo->line = uport->line; 7687ba2e769SAlan Cox retinfo->port = uport->iobase; 7697ba2e769SAlan Cox if (HIGH_BITS_OFFSET) 7707ba2e769SAlan Cox retinfo->port_high = (long) uport->iobase >> HIGH_BITS_OFFSET; 7717ba2e769SAlan Cox retinfo->irq = uport->irq; 772a17e74c5SAndy Shevchenko retinfo->flags = (__force int)uport->flags; 7737ba2e769SAlan Cox retinfo->xmit_fifo_size = uport->fifosize; 7747ba2e769SAlan Cox retinfo->baud_base = uport->uartclk / 16; 7757ba2e769SAlan Cox retinfo->close_delay = jiffies_to_msecs(port->close_delay) / 10; 7767ba2e769SAlan Cox retinfo->closing_wait = port->closing_wait == ASYNC_CLOSING_WAIT_NONE ? 7777ba2e769SAlan Cox ASYNC_CLOSING_WAIT_NONE : 7787ba2e769SAlan Cox jiffies_to_msecs(port->closing_wait) / 10; 7797ba2e769SAlan Cox retinfo->custom_divisor = uport->custom_divisor; 7807ba2e769SAlan Cox retinfo->hub6 = uport->hub6; 7817ba2e769SAlan Cox retinfo->io_type = uport->iotype; 7827ba2e769SAlan Cox retinfo->iomem_reg_shift = uport->regshift; 7837ba2e769SAlan Cox retinfo->iomem_base = (void *)(unsigned long)uport->mapbase; 7844047b371SPeter Hurley 7854047b371SPeter Hurley ret = 0; 7864047b371SPeter Hurley out: 787ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 7884047b371SPeter Hurley return ret; 7899f109694SAlan Cox } 7909f109694SAlan Cox 7915099d234SAl Viro static int uart_get_info_user(struct tty_struct *tty, 7925099d234SAl Viro struct serial_struct *ss) 7939f109694SAlan Cox { 7945099d234SAl Viro struct uart_state *state = tty->driver_data; 7955099d234SAl Viro struct tty_port *port = &state->port; 7963abe8c76SPeter Hurley 7975099d234SAl Viro return uart_get_info(port, ss) < 0 ? -EIO : 0; 798ab4382d2SGreg Kroah-Hartman } 799ab4382d2SGreg Kroah-Hartman 8007ba2e769SAlan Cox static int uart_set_info(struct tty_struct *tty, struct tty_port *port, 8017ba2e769SAlan Cox struct uart_state *state, 8027ba2e769SAlan Cox struct serial_struct *new_info) 803ab4382d2SGreg Kroah-Hartman { 8044047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 805ab4382d2SGreg Kroah-Hartman unsigned long new_port; 806ab4382d2SGreg Kroah-Hartman unsigned int change_irq, change_port, closing_wait; 807ab4382d2SGreg Kroah-Hartman unsigned int old_custom_divisor, close_delay; 808ab4382d2SGreg Kroah-Hartman upf_t old_flags, new_flags; 809ab4382d2SGreg Kroah-Hartman int retval = 0; 810ab4382d2SGreg Kroah-Hartman 8114047b371SPeter Hurley if (!uport) 8124047b371SPeter Hurley return -EIO; 8134047b371SPeter Hurley 8147ba2e769SAlan Cox new_port = new_info->port; 815ab4382d2SGreg Kroah-Hartman if (HIGH_BITS_OFFSET) 8167ba2e769SAlan Cox new_port += (unsigned long) new_info->port_high << HIGH_BITS_OFFSET; 817ab4382d2SGreg Kroah-Hartman 8187ba2e769SAlan Cox new_info->irq = irq_canonicalize(new_info->irq); 8197ba2e769SAlan Cox close_delay = msecs_to_jiffies(new_info->close_delay * 10); 8207ba2e769SAlan Cox closing_wait = new_info->closing_wait == ASYNC_CLOSING_WAIT_NONE ? 8214cb0fbfdSJiri Slaby ASYNC_CLOSING_WAIT_NONE : 8227ba2e769SAlan Cox msecs_to_jiffies(new_info->closing_wait * 10); 823ab4382d2SGreg Kroah-Hartman 824ab4382d2SGreg Kroah-Hartman 825ab4382d2SGreg Kroah-Hartman change_irq = !(uport->flags & UPF_FIXED_PORT) 8267ba2e769SAlan Cox && new_info->irq != uport->irq; 827ab4382d2SGreg Kroah-Hartman 828ab4382d2SGreg Kroah-Hartman /* 829ab4382d2SGreg Kroah-Hartman * Since changing the 'type' of the port changes its resource 830ab4382d2SGreg Kroah-Hartman * allocations, we should treat type changes the same as 831ab4382d2SGreg Kroah-Hartman * IO port changes. 832ab4382d2SGreg Kroah-Hartman */ 833ab4382d2SGreg Kroah-Hartman change_port = !(uport->flags & UPF_FIXED_PORT) 834ab4382d2SGreg Kroah-Hartman && (new_port != uport->iobase || 8357ba2e769SAlan Cox (unsigned long)new_info->iomem_base != uport->mapbase || 8367ba2e769SAlan Cox new_info->hub6 != uport->hub6 || 8377ba2e769SAlan Cox new_info->io_type != uport->iotype || 8387ba2e769SAlan Cox new_info->iomem_reg_shift != uport->regshift || 8397ba2e769SAlan Cox new_info->type != uport->type); 840ab4382d2SGreg Kroah-Hartman 841ab4382d2SGreg Kroah-Hartman old_flags = uport->flags; 842a17e74c5SAndy Shevchenko new_flags = (__force upf_t)new_info->flags; 843ab4382d2SGreg Kroah-Hartman old_custom_divisor = uport->custom_divisor; 844ab4382d2SGreg Kroah-Hartman 845ab4382d2SGreg Kroah-Hartman if (!capable(CAP_SYS_ADMIN)) { 846ab4382d2SGreg Kroah-Hartman retval = -EPERM; 847ab4382d2SGreg Kroah-Hartman if (change_irq || change_port || 8487ba2e769SAlan Cox (new_info->baud_base != uport->uartclk / 16) || 849ab4382d2SGreg Kroah-Hartman (close_delay != port->close_delay) || 850ab4382d2SGreg Kroah-Hartman (closing_wait != port->closing_wait) || 8517ba2e769SAlan Cox (new_info->xmit_fifo_size && 8527ba2e769SAlan Cox new_info->xmit_fifo_size != uport->fifosize) || 853ab4382d2SGreg Kroah-Hartman (((new_flags ^ old_flags) & ~UPF_USR_MASK) != 0)) 854ab4382d2SGreg Kroah-Hartman goto exit; 855ab4382d2SGreg Kroah-Hartman uport->flags = ((uport->flags & ~UPF_USR_MASK) | 856ab4382d2SGreg Kroah-Hartman (new_flags & UPF_USR_MASK)); 8577ba2e769SAlan Cox uport->custom_divisor = new_info->custom_divisor; 858ab4382d2SGreg Kroah-Hartman goto check_and_exit; 859ab4382d2SGreg Kroah-Hartman } 860ab4382d2SGreg Kroah-Hartman 8615e722b21SOndrej Mosnacek if (change_irq || change_port) { 862794edf30SDavid Howells retval = security_locked_down(LOCKDOWN_TIOCSSERIAL); 8635e722b21SOndrej Mosnacek if (retval) 864794edf30SDavid Howells goto exit; 8655e722b21SOndrej Mosnacek } 866794edf30SDavid Howells 867ab4382d2SGreg Kroah-Hartman /* 868ab4382d2SGreg Kroah-Hartman * Ask the low level driver to verify the settings. 869ab4382d2SGreg Kroah-Hartman */ 870ab4382d2SGreg Kroah-Hartman if (uport->ops->verify_port) 8717ba2e769SAlan Cox retval = uport->ops->verify_port(uport, new_info); 872ab4382d2SGreg Kroah-Hartman 8737ba2e769SAlan Cox if ((new_info->irq >= nr_irqs) || (new_info->irq < 0) || 8747ba2e769SAlan Cox (new_info->baud_base < 9600)) 875ab4382d2SGreg Kroah-Hartman retval = -EINVAL; 876ab4382d2SGreg Kroah-Hartman 877ab4382d2SGreg Kroah-Hartman if (retval) 878ab4382d2SGreg Kroah-Hartman goto exit; 879ab4382d2SGreg Kroah-Hartman 880ab4382d2SGreg Kroah-Hartman if (change_port || change_irq) { 881ab4382d2SGreg Kroah-Hartman retval = -EBUSY; 882ab4382d2SGreg Kroah-Hartman 883ab4382d2SGreg Kroah-Hartman /* 884ab4382d2SGreg Kroah-Hartman * Make sure that we are the sole user of this port. 885ab4382d2SGreg Kroah-Hartman */ 886ab4382d2SGreg Kroah-Hartman if (tty_port_users(port) > 1) 887ab4382d2SGreg Kroah-Hartman goto exit; 888ab4382d2SGreg Kroah-Hartman 889ab4382d2SGreg Kroah-Hartman /* 890ab4382d2SGreg Kroah-Hartman * We need to shutdown the serial port at the old 891ab4382d2SGreg Kroah-Hartman * port/type/irq combination. 892ab4382d2SGreg Kroah-Hartman */ 893ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 894ab4382d2SGreg Kroah-Hartman } 895ab4382d2SGreg Kroah-Hartman 896ab4382d2SGreg Kroah-Hartman if (change_port) { 897ab4382d2SGreg Kroah-Hartman unsigned long old_iobase, old_mapbase; 898ab4382d2SGreg Kroah-Hartman unsigned int old_type, old_iotype, old_hub6, old_shift; 899ab4382d2SGreg Kroah-Hartman 900ab4382d2SGreg Kroah-Hartman old_iobase = uport->iobase; 901ab4382d2SGreg Kroah-Hartman old_mapbase = uport->mapbase; 902ab4382d2SGreg Kroah-Hartman old_type = uport->type; 903ab4382d2SGreg Kroah-Hartman old_hub6 = uport->hub6; 904ab4382d2SGreg Kroah-Hartman old_iotype = uport->iotype; 905ab4382d2SGreg Kroah-Hartman old_shift = uport->regshift; 906ab4382d2SGreg Kroah-Hartman 907ab4382d2SGreg Kroah-Hartman /* 908ab4382d2SGreg Kroah-Hartman * Free and release old regions 909ab4382d2SGreg Kroah-Hartman */ 910a7cfaf16SFabio Estevam if (old_type != PORT_UNKNOWN && uport->ops->release_port) 911ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 912ab4382d2SGreg Kroah-Hartman 913ab4382d2SGreg Kroah-Hartman uport->iobase = new_port; 9147ba2e769SAlan Cox uport->type = new_info->type; 9157ba2e769SAlan Cox uport->hub6 = new_info->hub6; 9167ba2e769SAlan Cox uport->iotype = new_info->io_type; 9177ba2e769SAlan Cox uport->regshift = new_info->iomem_reg_shift; 9187ba2e769SAlan Cox uport->mapbase = (unsigned long)new_info->iomem_base; 919ab4382d2SGreg Kroah-Hartman 920ab4382d2SGreg Kroah-Hartman /* 921ab4382d2SGreg Kroah-Hartman * Claim and map the new regions 922ab4382d2SGreg Kroah-Hartman */ 923a7cfaf16SFabio Estevam if (uport->type != PORT_UNKNOWN && uport->ops->request_port) { 924ab4382d2SGreg Kroah-Hartman retval = uport->ops->request_port(uport); 925ab4382d2SGreg Kroah-Hartman } else { 926ab4382d2SGreg Kroah-Hartman /* Always success - Jean II */ 927ab4382d2SGreg Kroah-Hartman retval = 0; 928ab4382d2SGreg Kroah-Hartman } 929ab4382d2SGreg Kroah-Hartman 930ab4382d2SGreg Kroah-Hartman /* 931ab4382d2SGreg Kroah-Hartman * If we fail to request resources for the 932ab4382d2SGreg Kroah-Hartman * new port, try to restore the old settings. 933ab4382d2SGreg Kroah-Hartman */ 9347deb39edSThomas Pfaff if (retval) { 935ab4382d2SGreg Kroah-Hartman uport->iobase = old_iobase; 936ab4382d2SGreg Kroah-Hartman uport->type = old_type; 937ab4382d2SGreg Kroah-Hartman uport->hub6 = old_hub6; 938ab4382d2SGreg Kroah-Hartman uport->iotype = old_iotype; 939ab4382d2SGreg Kroah-Hartman uport->regshift = old_shift; 940ab4382d2SGreg Kroah-Hartman uport->mapbase = old_mapbase; 9417deb39edSThomas Pfaff 9427deb39edSThomas Pfaff if (old_type != PORT_UNKNOWN) { 943ab4382d2SGreg Kroah-Hartman retval = uport->ops->request_port(uport); 944ab4382d2SGreg Kroah-Hartman /* 945ab4382d2SGreg Kroah-Hartman * If we failed to restore the old settings, 946ab4382d2SGreg Kroah-Hartman * we fail like this. 947ab4382d2SGreg Kroah-Hartman */ 948ab4382d2SGreg Kroah-Hartman if (retval) 949ab4382d2SGreg Kroah-Hartman uport->type = PORT_UNKNOWN; 950ab4382d2SGreg Kroah-Hartman 951ab4382d2SGreg Kroah-Hartman /* 952ab4382d2SGreg Kroah-Hartman * We failed anyway. 953ab4382d2SGreg Kroah-Hartman */ 954ab4382d2SGreg Kroah-Hartman retval = -EBUSY; 9557deb39edSThomas Pfaff } 9567deb39edSThomas Pfaff 957ab4382d2SGreg Kroah-Hartman /* Added to return the correct error -Ram Gupta */ 958ab4382d2SGreg Kroah-Hartman goto exit; 959ab4382d2SGreg Kroah-Hartman } 960ab4382d2SGreg Kroah-Hartman } 961ab4382d2SGreg Kroah-Hartman 962ab4382d2SGreg Kroah-Hartman if (change_irq) 9637ba2e769SAlan Cox uport->irq = new_info->irq; 964ab4382d2SGreg Kroah-Hartman if (!(uport->flags & UPF_FIXED_PORT)) 9657ba2e769SAlan Cox uport->uartclk = new_info->baud_base * 16; 966ab4382d2SGreg Kroah-Hartman uport->flags = (uport->flags & ~UPF_CHANGE_MASK) | 967ab4382d2SGreg Kroah-Hartman (new_flags & UPF_CHANGE_MASK); 9687ba2e769SAlan Cox uport->custom_divisor = new_info->custom_divisor; 969ab4382d2SGreg Kroah-Hartman port->close_delay = close_delay; 970ab4382d2SGreg Kroah-Hartman port->closing_wait = closing_wait; 9717ba2e769SAlan Cox if (new_info->xmit_fifo_size) 9727ba2e769SAlan Cox uport->fifosize = new_info->xmit_fifo_size; 973ab4382d2SGreg Kroah-Hartman 974ab4382d2SGreg Kroah-Hartman check_and_exit: 975ab4382d2SGreg Kroah-Hartman retval = 0; 976ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) 977ab4382d2SGreg Kroah-Hartman goto exit; 978d41861caSPeter Hurley if (tty_port_initialized(port)) { 979ab4382d2SGreg Kroah-Hartman if (((old_flags ^ uport->flags) & UPF_SPD_MASK) || 980ab4382d2SGreg Kroah-Hartman old_custom_divisor != uport->custom_divisor) { 981ab4382d2SGreg Kroah-Hartman /* 982ab4382d2SGreg Kroah-Hartman * If they're setting up a custom divisor or speed, 983dc2f7271SJohan Hovold * instead of clearing it, then bitch about it. 984ab4382d2SGreg Kroah-Hartman */ 985ab4382d2SGreg Kroah-Hartman if (uport->flags & UPF_SPD_MASK) { 986dc2f7271SJohan Hovold dev_notice_ratelimited(uport->dev, 9872f2dafe7SSudip Mukherjee "%s sets custom speed on %s. This is deprecated.\n", 9882f2dafe7SSudip Mukherjee current->comm, 989429b4749SRasmus Villemoes tty_name(port->tty)); 990ab4382d2SGreg Kroah-Hartman } 991ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 992ab4382d2SGreg Kroah-Hartman } 993b3b57646SRob Herring } else { 994ab4382d2SGreg Kroah-Hartman retval = uart_startup(tty, state, 1); 99544117a1dSSebastian Andrzej Siewior if (retval == 0) 99644117a1dSSebastian Andrzej Siewior tty_port_set_initialized(port, true); 997b3b57646SRob Herring if (retval > 0) 998b3b57646SRob Herring retval = 0; 999b3b57646SRob Herring } 1000ab4382d2SGreg Kroah-Hartman exit: 10017ba2e769SAlan Cox return retval; 10027ba2e769SAlan Cox } 10037ba2e769SAlan Cox 10045099d234SAl Viro static int uart_set_info_user(struct tty_struct *tty, struct serial_struct *ss) 10057ba2e769SAlan Cox { 10065099d234SAl Viro struct uart_state *state = tty->driver_data; 10077ba2e769SAlan Cox struct tty_port *port = &state->port; 10087ba2e769SAlan Cox int retval; 10097ba2e769SAlan Cox 10105099d234SAl Viro down_write(&tty->termios_rwsem); 10117ba2e769SAlan Cox /* 10127ba2e769SAlan Cox * This semaphore protects port->count. It is also 10137ba2e769SAlan Cox * very useful to prevent opens. Also, take the 10147ba2e769SAlan Cox * port configuration semaphore to make sure that a 10157ba2e769SAlan Cox * module insertion/removal doesn't change anything 10167ba2e769SAlan Cox * under us. 10177ba2e769SAlan Cox */ 10187ba2e769SAlan Cox mutex_lock(&port->mutex); 10195099d234SAl Viro retval = uart_set_info(tty, port, state, ss); 1020ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 10215099d234SAl Viro up_write(&tty->termios_rwsem); 1022ab4382d2SGreg Kroah-Hartman return retval; 1023ab4382d2SGreg Kroah-Hartman } 1024ab4382d2SGreg Kroah-Hartman 1025ab4382d2SGreg Kroah-Hartman /** 1026ab4382d2SGreg Kroah-Hartman * uart_get_lsr_info - get line status register info 1027ab4382d2SGreg Kroah-Hartman * @tty: tty associated with the UART 1028ab4382d2SGreg Kroah-Hartman * @state: UART being queried 1029ab4382d2SGreg Kroah-Hartman * @value: returned modem value 1030ab4382d2SGreg Kroah-Hartman */ 1031ab4382d2SGreg Kroah-Hartman static int uart_get_lsr_info(struct tty_struct *tty, 1032ab4382d2SGreg Kroah-Hartman struct uart_state *state, unsigned int __user *value) 1033ab4382d2SGreg Kroah-Hartman { 10344047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 1035ab4382d2SGreg Kroah-Hartman unsigned int result; 1036ab4382d2SGreg Kroah-Hartman 1037ab4382d2SGreg Kroah-Hartman result = uport->ops->tx_empty(uport); 1038ab4382d2SGreg Kroah-Hartman 1039ab4382d2SGreg Kroah-Hartman /* 1040ab4382d2SGreg Kroah-Hartman * If we're about to load something into the transmit 1041ab4382d2SGreg Kroah-Hartman * register, we'll pretend the transmitter isn't empty to 1042ab4382d2SGreg Kroah-Hartman * avoid a race condition (depending on when the transmit 1043ab4382d2SGreg Kroah-Hartman * interrupt happens). 1044ab4382d2SGreg Kroah-Hartman */ 1045ab4382d2SGreg Kroah-Hartman if (uport->x_char || 1046ab4382d2SGreg Kroah-Hartman ((uart_circ_chars_pending(&state->xmit) > 0) && 1047d01f4d18SPeter Hurley !uart_tx_stopped(uport))) 1048ab4382d2SGreg Kroah-Hartman result &= ~TIOCSER_TEMT; 1049ab4382d2SGreg Kroah-Hartman 1050ab4382d2SGreg Kroah-Hartman return put_user(result, value); 1051ab4382d2SGreg Kroah-Hartman } 1052ab4382d2SGreg Kroah-Hartman 105360b33c13SAlan Cox static int uart_tiocmget(struct tty_struct *tty) 1054ab4382d2SGreg Kroah-Hartman { 1055ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1056ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 10574047b371SPeter Hurley struct uart_port *uport; 1058ab4382d2SGreg Kroah-Hartman int result = -EIO; 1059ab4382d2SGreg Kroah-Hartman 1060ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 10614047b371SPeter Hurley uport = uart_port_check(state); 10624047b371SPeter Hurley if (!uport) 10634047b371SPeter Hurley goto out; 10644047b371SPeter Hurley 106518900ca6SPeter Hurley if (!tty_io_error(tty)) { 1066ab4382d2SGreg Kroah-Hartman result = uport->mctrl; 1067ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1068ab4382d2SGreg Kroah-Hartman result |= uport->ops->get_mctrl(uport); 1069ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1070ab4382d2SGreg Kroah-Hartman } 10714047b371SPeter Hurley out: 1072ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1073ab4382d2SGreg Kroah-Hartman return result; 1074ab4382d2SGreg Kroah-Hartman } 1075ab4382d2SGreg Kroah-Hartman 1076ab4382d2SGreg Kroah-Hartman static int 107720b9d177SAlan Cox uart_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear) 1078ab4382d2SGreg Kroah-Hartman { 1079ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1080ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 10814047b371SPeter Hurley struct uart_port *uport; 1082ab4382d2SGreg Kroah-Hartman int ret = -EIO; 1083ab4382d2SGreg Kroah-Hartman 1084ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 10854047b371SPeter Hurley uport = uart_port_check(state); 10864047b371SPeter Hurley if (!uport) 10874047b371SPeter Hurley goto out; 10884047b371SPeter Hurley 108918900ca6SPeter Hurley if (!tty_io_error(tty)) { 1090ab4382d2SGreg Kroah-Hartman uart_update_mctrl(uport, set, clear); 1091ab4382d2SGreg Kroah-Hartman ret = 0; 1092ab4382d2SGreg Kroah-Hartman } 10934047b371SPeter Hurley out: 1094ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1095ab4382d2SGreg Kroah-Hartman return ret; 1096ab4382d2SGreg Kroah-Hartman } 1097ab4382d2SGreg Kroah-Hartman 1098ab4382d2SGreg Kroah-Hartman static int uart_break_ctl(struct tty_struct *tty, int break_state) 1099ab4382d2SGreg Kroah-Hartman { 1100ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1101ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 11024047b371SPeter Hurley struct uart_port *uport; 11034047b371SPeter Hurley int ret = -EIO; 1104ab4382d2SGreg Kroah-Hartman 1105ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 11064047b371SPeter Hurley uport = uart_port_check(state); 11074047b371SPeter Hurley if (!uport) 11084047b371SPeter Hurley goto out; 1109ab4382d2SGreg Kroah-Hartman 11107d73170eSJiangfeng Xiao if (uport->type != PORT_UNKNOWN && uport->ops->break_ctl) 1111ab4382d2SGreg Kroah-Hartman uport->ops->break_ctl(uport, break_state); 11124047b371SPeter Hurley ret = 0; 11134047b371SPeter Hurley out: 1114ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 11154047b371SPeter Hurley return ret; 1116ab4382d2SGreg Kroah-Hartman } 1117ab4382d2SGreg Kroah-Hartman 1118ab4382d2SGreg Kroah-Hartman static int uart_do_autoconfig(struct tty_struct *tty, struct uart_state *state) 1119ab4382d2SGreg Kroah-Hartman { 1120ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 11214047b371SPeter Hurley struct uart_port *uport; 1122ab4382d2SGreg Kroah-Hartman int flags, ret; 1123ab4382d2SGreg Kroah-Hartman 1124ab4382d2SGreg Kroah-Hartman if (!capable(CAP_SYS_ADMIN)) 1125ab4382d2SGreg Kroah-Hartman return -EPERM; 1126ab4382d2SGreg Kroah-Hartman 1127ab4382d2SGreg Kroah-Hartman /* 1128ab4382d2SGreg Kroah-Hartman * Take the per-port semaphore. This prevents count from 1129ab4382d2SGreg Kroah-Hartman * changing, and hence any extra opens of the port while 1130ab4382d2SGreg Kroah-Hartman * we're auto-configuring. 1131ab4382d2SGreg Kroah-Hartman */ 1132ab4382d2SGreg Kroah-Hartman if (mutex_lock_interruptible(&port->mutex)) 1133ab4382d2SGreg Kroah-Hartman return -ERESTARTSYS; 1134ab4382d2SGreg Kroah-Hartman 11354047b371SPeter Hurley uport = uart_port_check(state); 11364047b371SPeter Hurley if (!uport) { 11374047b371SPeter Hurley ret = -EIO; 11384047b371SPeter Hurley goto out; 11394047b371SPeter Hurley } 11404047b371SPeter Hurley 1141ab4382d2SGreg Kroah-Hartman ret = -EBUSY; 1142ab4382d2SGreg Kroah-Hartman if (tty_port_users(port) == 1) { 1143ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 1144ab4382d2SGreg Kroah-Hartman 1145ab4382d2SGreg Kroah-Hartman /* 1146ab4382d2SGreg Kroah-Hartman * If we already have a port type configured, 1147ab4382d2SGreg Kroah-Hartman * we must release its resources. 1148ab4382d2SGreg Kroah-Hartman */ 1149a7cfaf16SFabio Estevam if (uport->type != PORT_UNKNOWN && uport->ops->release_port) 1150ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 1151ab4382d2SGreg Kroah-Hartman 1152ab4382d2SGreg Kroah-Hartman flags = UART_CONFIG_TYPE; 1153ab4382d2SGreg Kroah-Hartman if (uport->flags & UPF_AUTO_IRQ) 1154ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_IRQ; 1155ab4382d2SGreg Kroah-Hartman 1156ab4382d2SGreg Kroah-Hartman /* 1157ab4382d2SGreg Kroah-Hartman * This will claim the ports resources if 1158ab4382d2SGreg Kroah-Hartman * a port is found. 1159ab4382d2SGreg Kroah-Hartman */ 1160ab4382d2SGreg Kroah-Hartman uport->ops->config_port(uport, flags); 1161ab4382d2SGreg Kroah-Hartman 1162ab4382d2SGreg Kroah-Hartman ret = uart_startup(tty, state, 1); 116371456906SSebastian Andrzej Siewior if (ret == 0) 116471456906SSebastian Andrzej Siewior tty_port_set_initialized(port, true); 1165b3b57646SRob Herring if (ret > 0) 1166b3b57646SRob Herring ret = 0; 1167ab4382d2SGreg Kroah-Hartman } 11684047b371SPeter Hurley out: 1169ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1170ab4382d2SGreg Kroah-Hartman return ret; 1171ab4382d2SGreg Kroah-Hartman } 1172ab4382d2SGreg Kroah-Hartman 11731fdc3106SAlexander Shiyan static void uart_enable_ms(struct uart_port *uport) 11741fdc3106SAlexander Shiyan { 11751fdc3106SAlexander Shiyan /* 11761fdc3106SAlexander Shiyan * Force modem status interrupts on 11771fdc3106SAlexander Shiyan */ 11781fdc3106SAlexander Shiyan if (uport->ops->enable_ms) 11791fdc3106SAlexander Shiyan uport->ops->enable_ms(uport); 11801fdc3106SAlexander Shiyan } 11811fdc3106SAlexander Shiyan 1182ab4382d2SGreg Kroah-Hartman /* 1183ab4382d2SGreg Kroah-Hartman * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change 1184ab4382d2SGreg Kroah-Hartman * - mask passed in arg for lines of interest 1185ab4382d2SGreg Kroah-Hartman * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) 1186ab4382d2SGreg Kroah-Hartman * Caller should use TIOCGICOUNT to see which one it was 1187ab4382d2SGreg Kroah-Hartman * 1188ab4382d2SGreg Kroah-Hartman * FIXME: This wants extracting into a common all driver implementation 1189ab4382d2SGreg Kroah-Hartman * of TIOCMWAIT using tty_port. 1190ab4382d2SGreg Kroah-Hartman */ 11919ed19428SPeter Hurley static int uart_wait_modem_status(struct uart_state *state, unsigned long arg) 1192ab4382d2SGreg Kroah-Hartman { 11939ed19428SPeter Hurley struct uart_port *uport; 1194ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1195ab4382d2SGreg Kroah-Hartman DECLARE_WAITQUEUE(wait, current); 1196ab4382d2SGreg Kroah-Hartman struct uart_icount cprev, cnow; 1197ab4382d2SGreg Kroah-Hartman int ret; 1198ab4382d2SGreg Kroah-Hartman 1199ab4382d2SGreg Kroah-Hartman /* 1200ab4382d2SGreg Kroah-Hartman * note the counters on entry 1201ab4382d2SGreg Kroah-Hartman */ 12029ed19428SPeter Hurley uport = uart_port_ref(state); 12039ed19428SPeter Hurley if (!uport) 12049ed19428SPeter Hurley return -EIO; 1205ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1206ab4382d2SGreg Kroah-Hartman memcpy(&cprev, &uport->icount, sizeof(struct uart_icount)); 12071fdc3106SAlexander Shiyan uart_enable_ms(uport); 1208ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1209ab4382d2SGreg Kroah-Hartman 1210ab4382d2SGreg Kroah-Hartman add_wait_queue(&port->delta_msr_wait, &wait); 1211ab4382d2SGreg Kroah-Hartman for (;;) { 1212ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1213ab4382d2SGreg Kroah-Hartman memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); 1214ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1215ab4382d2SGreg Kroah-Hartman 1216ab4382d2SGreg Kroah-Hartman set_current_state(TASK_INTERRUPTIBLE); 1217ab4382d2SGreg Kroah-Hartman 1218ab4382d2SGreg Kroah-Hartman if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || 1219ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || 1220ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || 1221ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) { 1222ab4382d2SGreg Kroah-Hartman ret = 0; 1223ab4382d2SGreg Kroah-Hartman break; 1224ab4382d2SGreg Kroah-Hartman } 1225ab4382d2SGreg Kroah-Hartman 1226ab4382d2SGreg Kroah-Hartman schedule(); 1227ab4382d2SGreg Kroah-Hartman 1228ab4382d2SGreg Kroah-Hartman /* see if a signal did it */ 1229ab4382d2SGreg Kroah-Hartman if (signal_pending(current)) { 1230ab4382d2SGreg Kroah-Hartman ret = -ERESTARTSYS; 1231ab4382d2SGreg Kroah-Hartman break; 1232ab4382d2SGreg Kroah-Hartman } 1233ab4382d2SGreg Kroah-Hartman 1234ab4382d2SGreg Kroah-Hartman cprev = cnow; 1235ab4382d2SGreg Kroah-Hartman } 123697f9f707SFabian Frederick __set_current_state(TASK_RUNNING); 1237ab4382d2SGreg Kroah-Hartman remove_wait_queue(&port->delta_msr_wait, &wait); 12389ed19428SPeter Hurley uart_port_deref(uport); 1239ab4382d2SGreg Kroah-Hartman 1240ab4382d2SGreg Kroah-Hartman return ret; 1241ab4382d2SGreg Kroah-Hartman } 1242ab4382d2SGreg Kroah-Hartman 1243ab4382d2SGreg Kroah-Hartman /* 1244ab4382d2SGreg Kroah-Hartman * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) 1245ab4382d2SGreg Kroah-Hartman * Return: write counters to the user passed counter struct 1246ab4382d2SGreg Kroah-Hartman * NB: both 1->0 and 0->1 transitions are counted except for 1247ab4382d2SGreg Kroah-Hartman * RI where only 0->1 is counted. 1248ab4382d2SGreg Kroah-Hartman */ 1249ab4382d2SGreg Kroah-Hartman static int uart_get_icount(struct tty_struct *tty, 1250ab4382d2SGreg Kroah-Hartman struct serial_icounter_struct *icount) 1251ab4382d2SGreg Kroah-Hartman { 1252ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1253ab4382d2SGreg Kroah-Hartman struct uart_icount cnow; 12549ed19428SPeter Hurley struct uart_port *uport; 1255ab4382d2SGreg Kroah-Hartman 12569ed19428SPeter Hurley uport = uart_port_ref(state); 12579ed19428SPeter Hurley if (!uport) 12589ed19428SPeter Hurley return -EIO; 1259ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1260ab4382d2SGreg Kroah-Hartman memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); 1261ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 12629ed19428SPeter Hurley uart_port_deref(uport); 1263ab4382d2SGreg Kroah-Hartman 1264ab4382d2SGreg Kroah-Hartman icount->cts = cnow.cts; 1265ab4382d2SGreg Kroah-Hartman icount->dsr = cnow.dsr; 1266ab4382d2SGreg Kroah-Hartman icount->rng = cnow.rng; 1267ab4382d2SGreg Kroah-Hartman icount->dcd = cnow.dcd; 1268ab4382d2SGreg Kroah-Hartman icount->rx = cnow.rx; 1269ab4382d2SGreg Kroah-Hartman icount->tx = cnow.tx; 1270ab4382d2SGreg Kroah-Hartman icount->frame = cnow.frame; 1271ab4382d2SGreg Kroah-Hartman icount->overrun = cnow.overrun; 1272ab4382d2SGreg Kroah-Hartman icount->parity = cnow.parity; 1273ab4382d2SGreg Kroah-Hartman icount->brk = cnow.brk; 1274ab4382d2SGreg Kroah-Hartman icount->buf_overrun = cnow.buf_overrun; 1275ab4382d2SGreg Kroah-Hartman 1276ab4382d2SGreg Kroah-Hartman return 0; 1277ab4382d2SGreg Kroah-Hartman } 1278ab4382d2SGreg Kroah-Hartman 1279*51ad36baSIlpo Järvinen #define SER_RS485_LEGACY_FLAGS (SER_RS485_ENABLED | SER_RS485_RTS_ON_SEND | \ 1280*51ad36baSIlpo Järvinen SER_RS485_RTS_AFTER_SEND | SER_RS485_RX_DURING_TX | \ 1281*51ad36baSIlpo Järvinen SER_RS485_TERMINATE_BUS) 1282*51ad36baSIlpo Järvinen 1283*51ad36baSIlpo Järvinen static int uart_check_rs485_flags(struct uart_port *port, struct serial_rs485 *rs485) 1284*51ad36baSIlpo Järvinen { 1285*51ad36baSIlpo Järvinen u32 flags = rs485->flags; 1286*51ad36baSIlpo Järvinen 1287*51ad36baSIlpo Järvinen /* Don't return -EINVAL for unsupported legacy flags */ 1288*51ad36baSIlpo Järvinen flags &= ~SER_RS485_LEGACY_FLAGS; 1289*51ad36baSIlpo Järvinen 1290*51ad36baSIlpo Järvinen /* 1291*51ad36baSIlpo Järvinen * For any bit outside of the legacy ones that is not supported by 1292*51ad36baSIlpo Järvinen * the driver, return -EINVAL. 1293*51ad36baSIlpo Järvinen */ 1294*51ad36baSIlpo Järvinen if (flags & ~port->rs485_supported->flags) 1295*51ad36baSIlpo Järvinen return -EINVAL; 1296*51ad36baSIlpo Järvinen 1297*51ad36baSIlpo Järvinen return 0; 1298*51ad36baSIlpo Järvinen } 1299*51ad36baSIlpo Järvinen 13002dbd0c14SIlpo Järvinen static void uart_sanitize_serial_rs485(struct uart_port *port, struct serial_rs485 *rs485) 13012dbd0c14SIlpo Järvinen { 1302be2e2cb1SIlpo Järvinen u32 supported_flags = port->rs485_supported->flags; 1303be2e2cb1SIlpo Järvinen 1304596a9171SIlpo Järvinen if (!(rs485->flags & SER_RS485_ENABLED)) { 1305596a9171SIlpo Järvinen memset(rs485, 0, sizeof(*rs485)); 1306596a9171SIlpo Järvinen return; 1307596a9171SIlpo Järvinen } 1308596a9171SIlpo Järvinen 13092dbd0c14SIlpo Järvinen /* pick sane settings if the user hasn't */ 1310be2e2cb1SIlpo Järvinen if ((supported_flags & (SER_RS485_RTS_ON_SEND|SER_RS485_RTS_AFTER_SEND)) && 1311be2e2cb1SIlpo Järvinen !(rs485->flags & SER_RS485_RTS_ON_SEND) == 13122dbd0c14SIlpo Järvinen !(rs485->flags & SER_RS485_RTS_AFTER_SEND)) { 13132dbd0c14SIlpo Järvinen dev_warn_ratelimited(port->dev, 13142dbd0c14SIlpo Järvinen "%s (%d): invalid RTS setting, using RTS_ON_SEND instead\n", 13152dbd0c14SIlpo Järvinen port->name, port->line); 13162dbd0c14SIlpo Järvinen rs485->flags |= SER_RS485_RTS_ON_SEND; 13172dbd0c14SIlpo Järvinen rs485->flags &= ~SER_RS485_RTS_AFTER_SEND; 1318be2e2cb1SIlpo Järvinen supported_flags |= SER_RS485_RTS_ON_SEND|SER_RS485_RTS_AFTER_SEND; 13192dbd0c14SIlpo Järvinen } 13202dbd0c14SIlpo Järvinen 1321be2e2cb1SIlpo Järvinen if (!port->rs485_supported->delay_rts_before_send) { 1322be2e2cb1SIlpo Järvinen if (rs485->delay_rts_before_send) { 1323be2e2cb1SIlpo Järvinen dev_warn_ratelimited(port->dev, 1324be2e2cb1SIlpo Järvinen "%s (%d): RTS delay before sending not supported\n", 1325be2e2cb1SIlpo Järvinen port->name, port->line); 1326be2e2cb1SIlpo Järvinen } 1327be2e2cb1SIlpo Järvinen rs485->delay_rts_before_send = 0; 1328be2e2cb1SIlpo Järvinen } else if (rs485->delay_rts_before_send > RS485_MAX_RTS_DELAY) { 13292dbd0c14SIlpo Järvinen rs485->delay_rts_before_send = RS485_MAX_RTS_DELAY; 13302dbd0c14SIlpo Järvinen dev_warn_ratelimited(port->dev, 13312dbd0c14SIlpo Järvinen "%s (%d): RTS delay before sending clamped to %u ms\n", 13322dbd0c14SIlpo Järvinen port->name, port->line, rs485->delay_rts_before_send); 13332dbd0c14SIlpo Järvinen } 13342dbd0c14SIlpo Järvinen 1335be2e2cb1SIlpo Järvinen if (!port->rs485_supported->delay_rts_after_send) { 1336be2e2cb1SIlpo Järvinen if (rs485->delay_rts_after_send) { 1337be2e2cb1SIlpo Järvinen dev_warn_ratelimited(port->dev, 1338be2e2cb1SIlpo Järvinen "%s (%d): RTS delay after sending not supported\n", 1339be2e2cb1SIlpo Järvinen port->name, port->line); 1340be2e2cb1SIlpo Järvinen } 1341be2e2cb1SIlpo Järvinen rs485->delay_rts_after_send = 0; 1342be2e2cb1SIlpo Järvinen } else if (rs485->delay_rts_after_send > RS485_MAX_RTS_DELAY) { 13432dbd0c14SIlpo Järvinen rs485->delay_rts_after_send = RS485_MAX_RTS_DELAY; 13442dbd0c14SIlpo Järvinen dev_warn_ratelimited(port->dev, 13452dbd0c14SIlpo Järvinen "%s (%d): RTS delay after sending clamped to %u ms\n", 13462dbd0c14SIlpo Järvinen port->name, port->line, rs485->delay_rts_after_send); 13472dbd0c14SIlpo Järvinen } 1348be2e2cb1SIlpo Järvinen 1349be2e2cb1SIlpo Järvinen rs485->flags &= supported_flags; 1350be2e2cb1SIlpo Järvinen 13512dbd0c14SIlpo Järvinen /* Return clean padding area to userspace */ 13522dbd0c14SIlpo Järvinen memset(rs485->padding, 0, sizeof(rs485->padding)); 13532dbd0c14SIlpo Järvinen } 13542dbd0c14SIlpo Järvinen 13558322b1f5SIlpo Järvinen int uart_rs485_config(struct uart_port *port) 13568322b1f5SIlpo Järvinen { 1357be2e2cb1SIlpo Järvinen struct serial_rs485 *rs485 = &port->rs485; 1358596a9171SIlpo Järvinen int ret; 1359be2e2cb1SIlpo Järvinen 1360be2e2cb1SIlpo Järvinen uart_sanitize_serial_rs485(port, rs485); 1361be2e2cb1SIlpo Järvinen 1362596a9171SIlpo Järvinen ret = port->rs485_config(port, rs485); 1363596a9171SIlpo Järvinen if (ret) 1364596a9171SIlpo Järvinen memset(rs485, 0, sizeof(*rs485)); 1365596a9171SIlpo Järvinen 1366596a9171SIlpo Järvinen return ret; 13678322b1f5SIlpo Järvinen } 13688322b1f5SIlpo Järvinen EXPORT_SYMBOL_GPL(uart_rs485_config); 13698322b1f5SIlpo Järvinen 1370a5f276f1SRicardo Ribalda Delgado static int uart_get_rs485_config(struct uart_port *port, 1371a5f276f1SRicardo Ribalda Delgado struct serial_rs485 __user *rs485) 1372a5f276f1SRicardo Ribalda Delgado { 1373bd737f87SRicardo Ribalda Delgado unsigned long flags; 1374bd737f87SRicardo Ribalda Delgado struct serial_rs485 aux; 1375bd737f87SRicardo Ribalda Delgado 1376bd737f87SRicardo Ribalda Delgado spin_lock_irqsave(&port->lock, flags); 1377bd737f87SRicardo Ribalda Delgado aux = port->rs485; 1378bd737f87SRicardo Ribalda Delgado spin_unlock_irqrestore(&port->lock, flags); 1379bd737f87SRicardo Ribalda Delgado 1380bd737f87SRicardo Ribalda Delgado if (copy_to_user(rs485, &aux, sizeof(aux))) 1381a5f276f1SRicardo Ribalda Delgado return -EFAULT; 1382bd737f87SRicardo Ribalda Delgado 1383a5f276f1SRicardo Ribalda Delgado return 0; 1384a5f276f1SRicardo Ribalda Delgado } 1385a5f276f1SRicardo Ribalda Delgado 1386a5f276f1SRicardo Ribalda Delgado static int uart_set_rs485_config(struct uart_port *port, 1387a5f276f1SRicardo Ribalda Delgado struct serial_rs485 __user *rs485_user) 1388a5f276f1SRicardo Ribalda Delgado { 1389a5f276f1SRicardo Ribalda Delgado struct serial_rs485 rs485; 1390a5f276f1SRicardo Ribalda Delgado int ret; 1391bd737f87SRicardo Ribalda Delgado unsigned long flags; 1392a5f276f1SRicardo Ribalda Delgado 1393a5f276f1SRicardo Ribalda Delgado if (!port->rs485_config) 139479c5966cSJohan Hovold return -ENOTTY; 1395a5f276f1SRicardo Ribalda Delgado 1396a5f276f1SRicardo Ribalda Delgado if (copy_from_user(&rs485, rs485_user, sizeof(*rs485_user))) 1397a5f276f1SRicardo Ribalda Delgado return -EFAULT; 1398a5f276f1SRicardo Ribalda Delgado 1399*51ad36baSIlpo Järvinen ret = uart_check_rs485_flags(port, &rs485); 1400*51ad36baSIlpo Järvinen if (ret) 1401*51ad36baSIlpo Järvinen return ret; 14022dbd0c14SIlpo Järvinen uart_sanitize_serial_rs485(port, &rs485); 14030ed12afaSLino Sanfilippo 1404bd737f87SRicardo Ribalda Delgado spin_lock_irqsave(&port->lock, flags); 1405a5f276f1SRicardo Ribalda Delgado ret = port->rs485_config(port, &rs485); 14060ed12afaSLino Sanfilippo if (!ret) 14070ed12afaSLino Sanfilippo port->rs485 = rs485; 1408bd737f87SRicardo Ribalda Delgado spin_unlock_irqrestore(&port->lock, flags); 1409a5f276f1SRicardo Ribalda Delgado if (ret) 1410a5f276f1SRicardo Ribalda Delgado return ret; 1411a5f276f1SRicardo Ribalda Delgado 1412a5f276f1SRicardo Ribalda Delgado if (copy_to_user(rs485_user, &port->rs485, sizeof(port->rs485))) 1413a5f276f1SRicardo Ribalda Delgado return -EFAULT; 1414a5f276f1SRicardo Ribalda Delgado 1415a5f276f1SRicardo Ribalda Delgado return 0; 1416a5f276f1SRicardo Ribalda Delgado } 1417a5f276f1SRicardo Ribalda Delgado 1418ad8c0eaaSNicolas Ferre static int uart_get_iso7816_config(struct uart_port *port, 1419ad8c0eaaSNicolas Ferre struct serial_iso7816 __user *iso7816) 1420ad8c0eaaSNicolas Ferre { 1421ad8c0eaaSNicolas Ferre unsigned long flags; 1422ad8c0eaaSNicolas Ferre struct serial_iso7816 aux; 1423ad8c0eaaSNicolas Ferre 1424ad8c0eaaSNicolas Ferre if (!port->iso7816_config) 142579c5966cSJohan Hovold return -ENOTTY; 1426ad8c0eaaSNicolas Ferre 1427ad8c0eaaSNicolas Ferre spin_lock_irqsave(&port->lock, flags); 1428ad8c0eaaSNicolas Ferre aux = port->iso7816; 1429ad8c0eaaSNicolas Ferre spin_unlock_irqrestore(&port->lock, flags); 1430ad8c0eaaSNicolas Ferre 1431ad8c0eaaSNicolas Ferre if (copy_to_user(iso7816, &aux, sizeof(aux))) 1432ad8c0eaaSNicolas Ferre return -EFAULT; 1433ad8c0eaaSNicolas Ferre 1434ad8c0eaaSNicolas Ferre return 0; 1435ad8c0eaaSNicolas Ferre } 1436ad8c0eaaSNicolas Ferre 1437ad8c0eaaSNicolas Ferre static int uart_set_iso7816_config(struct uart_port *port, 1438ad8c0eaaSNicolas Ferre struct serial_iso7816 __user *iso7816_user) 1439ad8c0eaaSNicolas Ferre { 1440ad8c0eaaSNicolas Ferre struct serial_iso7816 iso7816; 1441ad8c0eaaSNicolas Ferre int i, ret; 1442ad8c0eaaSNicolas Ferre unsigned long flags; 1443ad8c0eaaSNicolas Ferre 1444ad8c0eaaSNicolas Ferre if (!port->iso7816_config) 144579c5966cSJohan Hovold return -ENOTTY; 1446ad8c0eaaSNicolas Ferre 1447ad8c0eaaSNicolas Ferre if (copy_from_user(&iso7816, iso7816_user, sizeof(*iso7816_user))) 1448ad8c0eaaSNicolas Ferre return -EFAULT; 1449ad8c0eaaSNicolas Ferre 1450ad8c0eaaSNicolas Ferre /* 1451ad8c0eaaSNicolas Ferre * There are 5 words reserved for future use. Check that userspace 1452ad8c0eaaSNicolas Ferre * doesn't put stuff in there to prevent breakages in the future. 1453ad8c0eaaSNicolas Ferre */ 1454ad8c0eaaSNicolas Ferre for (i = 0; i < 5; i++) 1455ad8c0eaaSNicolas Ferre if (iso7816.reserved[i]) 1456ad8c0eaaSNicolas Ferre return -EINVAL; 1457ad8c0eaaSNicolas Ferre 1458ad8c0eaaSNicolas Ferre spin_lock_irqsave(&port->lock, flags); 1459ad8c0eaaSNicolas Ferre ret = port->iso7816_config(port, &iso7816); 1460ad8c0eaaSNicolas Ferre spin_unlock_irqrestore(&port->lock, flags); 1461ad8c0eaaSNicolas Ferre if (ret) 1462ad8c0eaaSNicolas Ferre return ret; 1463ad8c0eaaSNicolas Ferre 1464ad8c0eaaSNicolas Ferre if (copy_to_user(iso7816_user, &port->iso7816, sizeof(port->iso7816))) 1465ad8c0eaaSNicolas Ferre return -EFAULT; 1466ad8c0eaaSNicolas Ferre 1467ad8c0eaaSNicolas Ferre return 0; 1468ad8c0eaaSNicolas Ferre } 1469ad8c0eaaSNicolas Ferre 1470ab4382d2SGreg Kroah-Hartman /* 1471ab4382d2SGreg Kroah-Hartman * Called via sys_ioctl. We can use spin_lock_irq() here. 1472ab4382d2SGreg Kroah-Hartman */ 1473ab4382d2SGreg Kroah-Hartman static int 14744047b371SPeter Hurley uart_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg) 1475ab4382d2SGreg Kroah-Hartman { 1476ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1477ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 14784047b371SPeter Hurley struct uart_port *uport; 1479ab4382d2SGreg Kroah-Hartman void __user *uarg = (void __user *)arg; 1480ab4382d2SGreg Kroah-Hartman int ret = -ENOIOCTLCMD; 1481ab4382d2SGreg Kroah-Hartman 1482ab4382d2SGreg Kroah-Hartman 1483ab4382d2SGreg Kroah-Hartman /* 1484ab4382d2SGreg Kroah-Hartman * These ioctls don't rely on the hardware to be present. 1485ab4382d2SGreg Kroah-Hartman */ 1486ab4382d2SGreg Kroah-Hartman switch (cmd) { 1487ab4382d2SGreg Kroah-Hartman case TIOCSERCONFIG: 14887c8ab967SPeter Hurley down_write(&tty->termios_rwsem); 1489ab4382d2SGreg Kroah-Hartman ret = uart_do_autoconfig(tty, state); 14907c8ab967SPeter Hurley up_write(&tty->termios_rwsem); 1491ab4382d2SGreg Kroah-Hartman break; 1492ab4382d2SGreg Kroah-Hartman } 1493ab4382d2SGreg Kroah-Hartman 1494ab4382d2SGreg Kroah-Hartman if (ret != -ENOIOCTLCMD) 1495ab4382d2SGreg Kroah-Hartman goto out; 1496ab4382d2SGreg Kroah-Hartman 149718900ca6SPeter Hurley if (tty_io_error(tty)) { 1498ab4382d2SGreg Kroah-Hartman ret = -EIO; 1499ab4382d2SGreg Kroah-Hartman goto out; 1500ab4382d2SGreg Kroah-Hartman } 1501ab4382d2SGreg Kroah-Hartman 1502ab4382d2SGreg Kroah-Hartman /* 1503ab4382d2SGreg Kroah-Hartman * The following should only be used when hardware is present. 1504ab4382d2SGreg Kroah-Hartman */ 1505ab4382d2SGreg Kroah-Hartman switch (cmd) { 1506ab4382d2SGreg Kroah-Hartman case TIOCMIWAIT: 1507ab4382d2SGreg Kroah-Hartman ret = uart_wait_modem_status(state, arg); 1508ab4382d2SGreg Kroah-Hartman break; 1509ab4382d2SGreg Kroah-Hartman } 1510ab4382d2SGreg Kroah-Hartman 1511ab4382d2SGreg Kroah-Hartman if (ret != -ENOIOCTLCMD) 1512ab4382d2SGreg Kroah-Hartman goto out; 1513ab4382d2SGreg Kroah-Hartman 1514ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 15154047b371SPeter Hurley uport = uart_port_check(state); 1516ab4382d2SGreg Kroah-Hartman 15174047b371SPeter Hurley if (!uport || tty_io_error(tty)) { 1518ab4382d2SGreg Kroah-Hartman ret = -EIO; 1519ab4382d2SGreg Kroah-Hartman goto out_up; 1520ab4382d2SGreg Kroah-Hartman } 1521ab4382d2SGreg Kroah-Hartman 1522ab4382d2SGreg Kroah-Hartman /* 1523ab4382d2SGreg Kroah-Hartman * All these rely on hardware being present and need to be 1524ab4382d2SGreg Kroah-Hartman * protected against the tty being hung up. 1525ab4382d2SGreg Kroah-Hartman */ 1526a9c20a9cSRicardo Ribalda Delgado 1527ab4382d2SGreg Kroah-Hartman switch (cmd) { 1528a9c20a9cSRicardo Ribalda Delgado case TIOCSERGETLSR: /* Get line status register */ 1529a9c20a9cSRicardo Ribalda Delgado ret = uart_get_lsr_info(tty, state, uarg); 1530a9c20a9cSRicardo Ribalda Delgado break; 1531a9c20a9cSRicardo Ribalda Delgado 1532a5f276f1SRicardo Ribalda Delgado case TIOCGRS485: 15334047b371SPeter Hurley ret = uart_get_rs485_config(uport, uarg); 1534a5f276f1SRicardo Ribalda Delgado break; 1535a5f276f1SRicardo Ribalda Delgado 1536a5f276f1SRicardo Ribalda Delgado case TIOCSRS485: 15374047b371SPeter Hurley ret = uart_set_rs485_config(uport, uarg); 1538a5f276f1SRicardo Ribalda Delgado break; 1539ad8c0eaaSNicolas Ferre 1540ad8c0eaaSNicolas Ferre case TIOCSISO7816: 1541ad8c0eaaSNicolas Ferre ret = uart_set_iso7816_config(state->uart_port, uarg); 1542ad8c0eaaSNicolas Ferre break; 1543ad8c0eaaSNicolas Ferre 1544ad8c0eaaSNicolas Ferre case TIOCGISO7816: 1545ad8c0eaaSNicolas Ferre ret = uart_get_iso7816_config(state->uart_port, uarg); 1546ad8c0eaaSNicolas Ferre break; 15474047b371SPeter Hurley default: 1548ab4382d2SGreg Kroah-Hartman if (uport->ops->ioctl) 1549ab4382d2SGreg Kroah-Hartman ret = uport->ops->ioctl(uport, cmd, arg); 1550ab4382d2SGreg Kroah-Hartman break; 1551ab4382d2SGreg Kroah-Hartman } 1552ab4382d2SGreg Kroah-Hartman out_up: 1553ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1554ab4382d2SGreg Kroah-Hartman out: 1555ab4382d2SGreg Kroah-Hartman return ret; 1556ab4382d2SGreg Kroah-Hartman } 1557ab4382d2SGreg Kroah-Hartman 1558ab4382d2SGreg Kroah-Hartman static void uart_set_ldisc(struct tty_struct *tty) 1559ab4382d2SGreg Kroah-Hartman { 1560ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 15614047b371SPeter Hurley struct uart_port *uport; 15622f70e49eSAlexey Kardashevskiy struct tty_port *port = &state->port; 15632f70e49eSAlexey Kardashevskiy 15642f70e49eSAlexey Kardashevskiy if (!tty_port_initialized(port)) 15652f70e49eSAlexey Kardashevskiy return; 1566ab4382d2SGreg Kroah-Hartman 1567db1b9dfcSPeter Hurley mutex_lock(&state->port.mutex); 15684047b371SPeter Hurley uport = uart_port_check(state); 15694047b371SPeter Hurley if (uport && uport->ops->set_ldisc) 1570732a84a0SPeter Hurley uport->ops->set_ldisc(uport, &tty->termios); 1571db1b9dfcSPeter Hurley mutex_unlock(&state->port.mutex); 1572db1b9dfcSPeter Hurley } 1573ab4382d2SGreg Kroah-Hartman 1574ab4382d2SGreg Kroah-Hartman static void uart_set_termios(struct tty_struct *tty, 1575ab4382d2SGreg Kroah-Hartman struct ktermios *old_termios) 1576ab4382d2SGreg Kroah-Hartman { 1577ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 15784047b371SPeter Hurley struct uart_port *uport; 1579adc8d746SAlan Cox unsigned int cflag = tty->termios.c_cflag; 15802cbacafdSRussell King unsigned int iflag_mask = IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK; 15812cbacafdSRussell King bool sw_changed = false; 1582ab4382d2SGreg Kroah-Hartman 15834047b371SPeter Hurley mutex_lock(&state->port.mutex); 15844047b371SPeter Hurley uport = uart_port_check(state); 15854047b371SPeter Hurley if (!uport) 15864047b371SPeter Hurley goto out; 15874047b371SPeter Hurley 15882cbacafdSRussell King /* 15892cbacafdSRussell King * Drivers doing software flow control also need to know 15902cbacafdSRussell King * about changes to these input settings. 15912cbacafdSRussell King */ 15922cbacafdSRussell King if (uport->flags & UPF_SOFT_FLOW) { 15932cbacafdSRussell King iflag_mask |= IXANY|IXON|IXOFF; 15942cbacafdSRussell King sw_changed = 15952cbacafdSRussell King tty->termios.c_cc[VSTART] != old_termios->c_cc[VSTART] || 15962cbacafdSRussell King tty->termios.c_cc[VSTOP] != old_termios->c_cc[VSTOP]; 15972cbacafdSRussell King } 1598ab4382d2SGreg Kroah-Hartman 1599ab4382d2SGreg Kroah-Hartman /* 1600ab4382d2SGreg Kroah-Hartman * These are the bits that are used to setup various 1601ab4382d2SGreg Kroah-Hartman * flags in the low level driver. We can ignore the Bfoo 1602ab4382d2SGreg Kroah-Hartman * bits in c_cflag; c_[io]speed will always be set 1603ab4382d2SGreg Kroah-Hartman * appropriately by set_termios() in tty_ioctl.c 1604ab4382d2SGreg Kroah-Hartman */ 1605ab4382d2SGreg Kroah-Hartman if ((cflag ^ old_termios->c_cflag) == 0 && 1606adc8d746SAlan Cox tty->termios.c_ospeed == old_termios->c_ospeed && 1607adc8d746SAlan Cox tty->termios.c_ispeed == old_termios->c_ispeed && 16082cbacafdSRussell King ((tty->termios.c_iflag ^ old_termios->c_iflag) & iflag_mask) == 0 && 16092cbacafdSRussell King !sw_changed) { 16104047b371SPeter Hurley goto out; 1611ab4382d2SGreg Kroah-Hartman } 1612ab4382d2SGreg Kroah-Hartman 1613ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, old_termios); 1614c7a6b9e4SHariprasad Kelam /* reload cflag from termios; port driver may have overridden flags */ 1615c18b55fdSPeter Hurley cflag = tty->termios.c_cflag; 1616ab4382d2SGreg Kroah-Hartman 1617ab4382d2SGreg Kroah-Hartman /* Handle transition to B0 status */ 1618ab4382d2SGreg Kroah-Hartman if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) 1619dec94e70SRussell King uart_clear_mctrl(uport, TIOCM_RTS | TIOCM_DTR); 1620ab4382d2SGreg Kroah-Hartman /* Handle transition away from B0 status */ 1621ab4382d2SGreg Kroah-Hartman else if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { 1622ab4382d2SGreg Kroah-Hartman unsigned int mask = TIOCM_DTR; 16234ed71addSTamseel Shams 162497ef38b8SPeter Hurley if (!(cflag & CRTSCTS) || !tty_throttled(tty)) 1625ab4382d2SGreg Kroah-Hartman mask |= TIOCM_RTS; 1626dec94e70SRussell King uart_set_mctrl(uport, mask); 1627ab4382d2SGreg Kroah-Hartman } 16284047b371SPeter Hurley out: 16294047b371SPeter Hurley mutex_unlock(&state->port.mutex); 1630ab4382d2SGreg Kroah-Hartman } 1631ab4382d2SGreg Kroah-Hartman 1632ab4382d2SGreg Kroah-Hartman /* 1633ef4f527cSKevin Cernekee * Calls to uart_close() are serialised via the tty_lock in 1634ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:tty_release() 1635ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:do_tty_hangup() 1636ab4382d2SGreg Kroah-Hartman */ 1637ab4382d2SGreg Kroah-Hartman static void uart_close(struct tty_struct *tty, struct file *filp) 1638ab4382d2SGreg Kroah-Hartman { 1639ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1640ab4382d2SGreg Kroah-Hartman 164191b32f54SPeter Hurley if (!state) { 164291b32f54SPeter Hurley struct uart_driver *drv = tty->driver->driver_state; 16439356335fSColin Ian King struct tty_port *port; 164491b32f54SPeter Hurley 164591b32f54SPeter Hurley state = drv->state + tty->index; 164691b32f54SPeter Hurley port = &state->port; 164791b32f54SPeter Hurley spin_lock_irq(&port->lock); 164891b32f54SPeter Hurley --port->count; 164991b32f54SPeter Hurley spin_unlock_irq(&port->lock); 1650ab4382d2SGreg Kroah-Hartman return; 165191b32f54SPeter Hurley } 1652ab4382d2SGreg Kroah-Hartman 165339b3d892SPeter Hurley pr_debug("uart_close(%d) called\n", tty->index); 1654ab4382d2SGreg Kroah-Hartman 1655761ed4a9SRob Herring tty_port_close(tty->port, tty, filp); 1656761ed4a9SRob Herring } 1657ab4382d2SGreg Kroah-Hartman 1658761ed4a9SRob Herring static void uart_tty_port_shutdown(struct tty_port *port) 1659761ed4a9SRob Herring { 1660761ed4a9SRob Herring struct uart_state *state = container_of(port, struct uart_state, port); 1661761ed4a9SRob Herring struct uart_port *uport = uart_port_check(state); 166200de977fSJohan Hovold char *buf; 1663af224ca2SPeter Hurley 1664ab4382d2SGreg Kroah-Hartman /* 1665ab4382d2SGreg Kroah-Hartman * At this point, we stop accepting input. To do this, we 1666ab4382d2SGreg Kroah-Hartman * disable the receive line status interrupts. 1667ab4382d2SGreg Kroah-Hartman */ 1668a5a2b130SAndy Shevchenko if (WARN(!uport, "detached port still initialized!\n")) 1669a5a2b130SAndy Shevchenko return; 1670761ed4a9SRob Herring 1671a5a2b130SAndy Shevchenko spin_lock_irq(&uport->lock); 1672ab4382d2SGreg Kroah-Hartman uport->ops->stop_rx(uport); 16736fb98fb3SPeter Hurley spin_unlock_irq(&uport->lock); 1674761ed4a9SRob Herring 1675761ed4a9SRob Herring uart_port_shutdown(port); 1676761ed4a9SRob Herring 1677ab4382d2SGreg Kroah-Hartman /* 1678761ed4a9SRob Herring * It's possible for shutdown to be called after suspend if we get 1679761ed4a9SRob Herring * a DCD drop (hangup) at just the right time. Clear suspended bit so 1680761ed4a9SRob Herring * we don't try to resume a port that has been shutdown. 1681ab4382d2SGreg Kroah-Hartman */ 1682761ed4a9SRob Herring tty_port_set_suspended(port, 0); 1683ab4382d2SGreg Kroah-Hartman 168400de977fSJohan Hovold /* 168500de977fSJohan Hovold * Free the transmit buffer. 168600de977fSJohan Hovold */ 168700de977fSJohan Hovold spin_lock_irq(&uport->lock); 168800de977fSJohan Hovold buf = state->xmit.buf; 168900de977fSJohan Hovold state->xmit.buf = NULL; 169000de977fSJohan Hovold spin_unlock_irq(&uport->lock); 1691ab4382d2SGreg Kroah-Hartman 169200de977fSJohan Hovold free_page((unsigned long)buf); 169300de977fSJohan Hovold 169400de977fSJohan Hovold uart_change_pm(state, UART_PM_STATE_OFF); 1695ab4382d2SGreg Kroah-Hartman } 1696ab4382d2SGreg Kroah-Hartman 16971f33a51dSJiri Slaby static void uart_wait_until_sent(struct tty_struct *tty, int timeout) 1698ab4382d2SGreg Kroah-Hartman { 16991f33a51dSJiri Slaby struct uart_state *state = tty->driver_data; 17009ed19428SPeter Hurley struct uart_port *port; 1701ab4382d2SGreg Kroah-Hartman unsigned long char_time, expire; 1702ab4382d2SGreg Kroah-Hartman 17039ed19428SPeter Hurley port = uart_port_ref(state); 1704ef510beaSAndy Shevchenko if (!port) 1705ef510beaSAndy Shevchenko return; 1706ef510beaSAndy Shevchenko 1707ef510beaSAndy Shevchenko if (port->type == PORT_UNKNOWN || port->fifosize == 0) { 17089ed19428SPeter Hurley uart_port_deref(port); 1709ab4382d2SGreg Kroah-Hartman return; 17109ed19428SPeter Hurley } 1711ab4382d2SGreg Kroah-Hartman 1712ab4382d2SGreg Kroah-Hartman /* 1713ab4382d2SGreg Kroah-Hartman * Set the check interval to be 1/5 of the estimated time to 1714ab4382d2SGreg Kroah-Hartman * send a single character, and make it at least 1. The check 1715ab4382d2SGreg Kroah-Hartman * interval should also be less than the timeout. 1716ab4382d2SGreg Kroah-Hartman * 1717ab4382d2SGreg Kroah-Hartman * Note: we have to use pretty tight timings here to satisfy 1718ab4382d2SGreg Kroah-Hartman * the NIST-PCTS. 1719ab4382d2SGreg Kroah-Hartman */ 172031f6bd7fSIlpo Järvinen char_time = max(nsecs_to_jiffies(port->frame_time / 5), 1UL); 172131f6bd7fSIlpo Järvinen 1722ab4382d2SGreg Kroah-Hartman if (timeout && timeout < char_time) 1723ab4382d2SGreg Kroah-Hartman char_time = timeout; 1724ab4382d2SGreg Kroah-Hartman 1725b0e0bd9dSTomasz Moń if (!uart_cts_enabled(port)) { 1726ab4382d2SGreg Kroah-Hartman /* 1727ab4382d2SGreg Kroah-Hartman * If the transmitter hasn't cleared in twice the approximate 1728ab4382d2SGreg Kroah-Hartman * amount of time to send the entire FIFO, it probably won't 1729ab4382d2SGreg Kroah-Hartman * ever clear. This assumes the UART isn't doing flow 1730ab4382d2SGreg Kroah-Hartman * control, which is currently the case. Hence, if it ever 1731ab4382d2SGreg Kroah-Hartman * takes longer than port->timeout, this is probably due to a 1732ab4382d2SGreg Kroah-Hartman * UART bug of some kind. So, we clamp the timeout parameter at 1733ab4382d2SGreg Kroah-Hartman * 2*port->timeout. 1734ab4382d2SGreg Kroah-Hartman */ 1735ab4382d2SGreg Kroah-Hartman if (timeout == 0 || timeout > 2 * port->timeout) 1736ab4382d2SGreg Kroah-Hartman timeout = 2 * port->timeout; 1737b0e0bd9dSTomasz Moń } 1738ab4382d2SGreg Kroah-Hartman 1739ab4382d2SGreg Kroah-Hartman expire = jiffies + timeout; 1740ab4382d2SGreg Kroah-Hartman 1741ab4382d2SGreg Kroah-Hartman pr_debug("uart_wait_until_sent(%d), jiffies=%lu, expire=%lu...\n", 1742ab4382d2SGreg Kroah-Hartman port->line, jiffies, expire); 1743ab4382d2SGreg Kroah-Hartman 1744ab4382d2SGreg Kroah-Hartman /* 1745ab4382d2SGreg Kroah-Hartman * Check whether the transmitter is empty every 'char_time'. 1746ab4382d2SGreg Kroah-Hartman * 'timeout' / 'expire' give us the maximum amount of time 1747ab4382d2SGreg Kroah-Hartman * we wait. 1748ab4382d2SGreg Kroah-Hartman */ 1749ab4382d2SGreg Kroah-Hartman while (!port->ops->tx_empty(port)) { 1750ab4382d2SGreg Kroah-Hartman msleep_interruptible(jiffies_to_msecs(char_time)); 1751ab4382d2SGreg Kroah-Hartman if (signal_pending(current)) 1752ab4382d2SGreg Kroah-Hartman break; 1753b0e0bd9dSTomasz Moń if (timeout && time_after(jiffies, expire)) 1754ab4382d2SGreg Kroah-Hartman break; 1755ab4382d2SGreg Kroah-Hartman } 17569ed19428SPeter Hurley uart_port_deref(port); 1757ab4382d2SGreg Kroah-Hartman } 1758ab4382d2SGreg Kroah-Hartman 1759ab4382d2SGreg Kroah-Hartman /* 1760ef4f527cSKevin Cernekee * Calls to uart_hangup() are serialised by the tty_lock in 1761ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:do_tty_hangup() 1762ef4f527cSKevin Cernekee * This runs from a workqueue and can sleep for a _short_ time only. 1763ab4382d2SGreg Kroah-Hartman */ 1764ab4382d2SGreg Kroah-Hartman static void uart_hangup(struct tty_struct *tty) 1765ab4382d2SGreg Kroah-Hartman { 1766ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1767ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1768af224ca2SPeter Hurley struct uart_port *uport; 1769ab4382d2SGreg Kroah-Hartman unsigned long flags; 1770ab4382d2SGreg Kroah-Hartman 177139b3d892SPeter Hurley pr_debug("uart_hangup(%d)\n", tty->index); 1772ab4382d2SGreg Kroah-Hartman 1773ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1774af224ca2SPeter Hurley uport = uart_port_check(state); 1775af224ca2SPeter Hurley WARN(!uport, "hangup of detached port!\n"); 1776af224ca2SPeter Hurley 1777807c8d81SPeter Hurley if (tty_port_active(port)) { 1778ab4382d2SGreg Kroah-Hartman uart_flush_buffer(tty); 1779ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 1780ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 1781ab4382d2SGreg Kroah-Hartman port->count = 0; 1782ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 1783807c8d81SPeter Hurley tty_port_set_active(port, 0); 1784ab4382d2SGreg Kroah-Hartman tty_port_tty_set(port, NULL); 1785af224ca2SPeter Hurley if (uport && !uart_console(uport)) 1786bf903c0cSGeert Uytterhoeven uart_change_pm(state, UART_PM_STATE_OFF); 1787ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->open_wait); 1788ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->delta_msr_wait); 1789ab4382d2SGreg Kroah-Hartman } 1790ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1791ab4382d2SGreg Kroah-Hartman } 1792ab4382d2SGreg Kroah-Hartman 1793af224ca2SPeter Hurley /* uport == NULL if uart_port has already been removed */ 17940b1db830SJiri Slaby static void uart_port_shutdown(struct tty_port *port) 17950b1db830SJiri Slaby { 1796b922e19dSJiri Slaby struct uart_state *state = container_of(port, struct uart_state, port); 17974047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 1798b922e19dSJiri Slaby 1799b922e19dSJiri Slaby /* 1800b922e19dSJiri Slaby * clear delta_msr_wait queue to avoid mem leaks: we may free 1801b922e19dSJiri Slaby * the irq here so the queue might never be woken up. Note 1802b922e19dSJiri Slaby * that we won't end up waiting on delta_msr_wait again since 1803b922e19dSJiri Slaby * any outstanding file descriptors should be pointing at 1804b922e19dSJiri Slaby * hung_up_tty_fops now. 1805b922e19dSJiri Slaby */ 1806b922e19dSJiri Slaby wake_up_interruptible(&port->delta_msr_wait); 1807b922e19dSJiri Slaby 18082765852eSJiri Slaby if (uport) { 18092765852eSJiri Slaby /* Free the IRQ and disable the port. */ 1810b922e19dSJiri Slaby uport->ops->shutdown(uport); 1811b922e19dSJiri Slaby 18122765852eSJiri Slaby /* Ensure that the IRQ handler isn't running on another CPU. */ 1813b922e19dSJiri Slaby synchronize_irq(uport->irq); 18140b1db830SJiri Slaby } 18152765852eSJiri Slaby } 18160b1db830SJiri Slaby 1817ab4382d2SGreg Kroah-Hartman static int uart_carrier_raised(struct tty_port *port) 1818ab4382d2SGreg Kroah-Hartman { 1819ab4382d2SGreg Kroah-Hartman struct uart_state *state = container_of(port, struct uart_state, port); 18209ed19428SPeter Hurley struct uart_port *uport; 1821ab4382d2SGreg Kroah-Hartman int mctrl; 18229ed19428SPeter Hurley 18239ed19428SPeter Hurley uport = uart_port_ref(state); 18249ed19428SPeter Hurley /* 18259ed19428SPeter Hurley * Should never observe uport == NULL since checks for hangup should 18269ed19428SPeter Hurley * abort the tty_port_block_til_ready() loop before checking for carrier 18279ed19428SPeter Hurley * raised -- but report carrier raised if it does anyway so open will 18289ed19428SPeter Hurley * continue and not sleep 18299ed19428SPeter Hurley */ 18309ed19428SPeter Hurley if (WARN_ON(!uport)) 18319ed19428SPeter Hurley return 1; 1832ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 18331fdc3106SAlexander Shiyan uart_enable_ms(uport); 1834ab4382d2SGreg Kroah-Hartman mctrl = uport->ops->get_mctrl(uport); 1835ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 18369ed19428SPeter Hurley uart_port_deref(uport); 1837ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_CAR) 1838ab4382d2SGreg Kroah-Hartman return 1; 1839ab4382d2SGreg Kroah-Hartman return 0; 1840ab4382d2SGreg Kroah-Hartman } 1841ab4382d2SGreg Kroah-Hartman 1842a6845e1eSRafael Gago static void uart_dtr_rts(struct tty_port *port, int raise) 1843ab4382d2SGreg Kroah-Hartman { 1844ab4382d2SGreg Kroah-Hartman struct uart_state *state = container_of(port, struct uart_state, port); 18459ed19428SPeter Hurley struct uart_port *uport; 18469ed19428SPeter Hurley 18479ed19428SPeter Hurley uport = uart_port_ref(state); 18489ed19428SPeter Hurley if (!uport) 18499ed19428SPeter Hurley return; 1850a6845e1eSRafael Gago uart_port_dtr_rts(uport, raise); 18519ed19428SPeter Hurley uart_port_deref(uport); 1852ab4382d2SGreg Kroah-Hartman } 1853ab4382d2SGreg Kroah-Hartman 18544cdd17baSJiri Slaby static int uart_install(struct tty_driver *driver, struct tty_struct *tty) 18554cdd17baSJiri Slaby { 18564cdd17baSJiri Slaby struct uart_driver *drv = driver->driver_state; 18574cdd17baSJiri Slaby struct uart_state *state = drv->state + tty->index; 18584cdd17baSJiri Slaby 18594cdd17baSJiri Slaby tty->driver_data = state; 18604cdd17baSJiri Slaby 18614cdd17baSJiri Slaby return tty_standard_install(driver, tty); 18624cdd17baSJiri Slaby } 18634cdd17baSJiri Slaby 1864ab4382d2SGreg Kroah-Hartman /* 1865ef4f527cSKevin Cernekee * Calls to uart_open are serialised by the tty_lock in 1866ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:tty_open() 1867ab4382d2SGreg Kroah-Hartman * Note that if this fails, then uart_close() _will_ be called. 1868ab4382d2SGreg Kroah-Hartman * 1869ab4382d2SGreg Kroah-Hartman * In time, we want to scrap the "opening nonpresent ports" 1870ab4382d2SGreg Kroah-Hartman * behaviour and implement an alternative way for setserial 1871ab4382d2SGreg Kroah-Hartman * to set base addresses/ports/types. This will allow us to 1872ab4382d2SGreg Kroah-Hartman * get rid of a certain amount of extra tests. 1873ab4382d2SGreg Kroah-Hartman */ 1874ab4382d2SGreg Kroah-Hartman static int uart_open(struct tty_struct *tty, struct file *filp) 1875ab4382d2SGreg Kroah-Hartman { 18764cdd17baSJiri Slaby struct uart_state *state = tty->driver_data; 18774cdd17baSJiri Slaby int retval; 1878b3b57646SRob Herring 1879b3b57646SRob Herring retval = tty_port_open(&state->port, tty, filp); 1880b3b57646SRob Herring if (retval > 0) 1881b3b57646SRob Herring retval = 0; 1882b3b57646SRob Herring 1883b3b57646SRob Herring return retval; 1884b3b57646SRob Herring } 1885b3b57646SRob Herring 1886b3b57646SRob Herring static int uart_port_activate(struct tty_port *port, struct tty_struct *tty) 1887b3b57646SRob Herring { 1888b3b57646SRob Herring struct uart_state *state = container_of(port, struct uart_state, port); 1889b3b57646SRob Herring struct uart_port *uport; 189013b18d35SSerge Semin int ret; 1891b3b57646SRob Herring 1892b3b57646SRob Herring uport = uart_port_check(state); 1893b3b57646SRob Herring if (!uport || uport->flags & UPF_DEAD) 1894b3b57646SRob Herring return -ENXIO; 1895b3b57646SRob Herring 1896ab4382d2SGreg Kroah-Hartman /* 1897ab4382d2SGreg Kroah-Hartman * Start up the serial port. 1898ab4382d2SGreg Kroah-Hartman */ 189913b18d35SSerge Semin ret = uart_startup(tty, state, 0); 190013b18d35SSerge Semin if (ret > 0) 190113b18d35SSerge Semin tty_port_set_active(port, 1); 190213b18d35SSerge Semin 190313b18d35SSerge Semin return ret; 1904ab4382d2SGreg Kroah-Hartman } 1905ab4382d2SGreg Kroah-Hartman 1906ab4382d2SGreg Kroah-Hartman static const char *uart_type(struct uart_port *port) 1907ab4382d2SGreg Kroah-Hartman { 1908ab4382d2SGreg Kroah-Hartman const char *str = NULL; 1909ab4382d2SGreg Kroah-Hartman 1910ab4382d2SGreg Kroah-Hartman if (port->ops->type) 1911ab4382d2SGreg Kroah-Hartman str = port->ops->type(port); 1912ab4382d2SGreg Kroah-Hartman 1913ab4382d2SGreg Kroah-Hartman if (!str) 1914ab4382d2SGreg Kroah-Hartman str = "unknown"; 1915ab4382d2SGreg Kroah-Hartman 1916ab4382d2SGreg Kroah-Hartman return str; 1917ab4382d2SGreg Kroah-Hartman } 1918ab4382d2SGreg Kroah-Hartman 1919ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_PROC_FS 1920ab4382d2SGreg Kroah-Hartman 1921ab4382d2SGreg Kroah-Hartman static void uart_line_info(struct seq_file *m, struct uart_driver *drv, int i) 1922ab4382d2SGreg Kroah-Hartman { 1923ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + i; 1924ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 19256f538fe3SLinus Walleij enum uart_pm_state pm_state; 19264047b371SPeter Hurley struct uart_port *uport; 1927ab4382d2SGreg Kroah-Hartman char stat_buf[32]; 1928ab4382d2SGreg Kroah-Hartman unsigned int status; 1929ab4382d2SGreg Kroah-Hartman int mmio; 1930ab4382d2SGreg Kroah-Hartman 19314047b371SPeter Hurley mutex_lock(&port->mutex); 19324047b371SPeter Hurley uport = uart_port_check(state); 1933ab4382d2SGreg Kroah-Hartman if (!uport) 19344047b371SPeter Hurley goto out; 1935ab4382d2SGreg Kroah-Hartman 1936ab4382d2SGreg Kroah-Hartman mmio = uport->iotype >= UPIO_MEM; 1937ab4382d2SGreg Kroah-Hartman seq_printf(m, "%d: uart:%s %s%08llX irq:%d", 1938ab4382d2SGreg Kroah-Hartman uport->line, uart_type(uport), 1939ab4382d2SGreg Kroah-Hartman mmio ? "mmio:0x" : "port:", 1940ab4382d2SGreg Kroah-Hartman mmio ? (unsigned long long)uport->mapbase 1941ab4382d2SGreg Kroah-Hartman : (unsigned long long)uport->iobase, 1942ab4382d2SGreg Kroah-Hartman uport->irq); 1943ab4382d2SGreg Kroah-Hartman 1944ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) { 1945ab4382d2SGreg Kroah-Hartman seq_putc(m, '\n'); 19464047b371SPeter Hurley goto out; 1947ab4382d2SGreg Kroah-Hartman } 1948ab4382d2SGreg Kroah-Hartman 1949ab4382d2SGreg Kroah-Hartman if (capable(CAP_SYS_ADMIN)) { 1950ab4382d2SGreg Kroah-Hartman pm_state = state->pm_state; 19516f538fe3SLinus Walleij if (pm_state != UART_PM_STATE_ON) 19526f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 1953ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1954ab4382d2SGreg Kroah-Hartman status = uport->ops->get_mctrl(uport); 1955ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 19566f538fe3SLinus Walleij if (pm_state != UART_PM_STATE_ON) 1957ab4382d2SGreg Kroah-Hartman uart_change_pm(state, pm_state); 1958ab4382d2SGreg Kroah-Hartman 1959ab4382d2SGreg Kroah-Hartman seq_printf(m, " tx:%d rx:%d", 1960ab4382d2SGreg Kroah-Hartman uport->icount.tx, uport->icount.rx); 1961ab4382d2SGreg Kroah-Hartman if (uport->icount.frame) 1962968af298SPeter Hurley seq_printf(m, " fe:%d", uport->icount.frame); 1963ab4382d2SGreg Kroah-Hartman if (uport->icount.parity) 1964968af298SPeter Hurley seq_printf(m, " pe:%d", uport->icount.parity); 1965ab4382d2SGreg Kroah-Hartman if (uport->icount.brk) 1966968af298SPeter Hurley seq_printf(m, " brk:%d", uport->icount.brk); 1967ab4382d2SGreg Kroah-Hartman if (uport->icount.overrun) 1968968af298SPeter Hurley seq_printf(m, " oe:%d", uport->icount.overrun); 19694f794097SJeremy Kerr if (uport->icount.buf_overrun) 19704f794097SJeremy Kerr seq_printf(m, " bo:%d", uport->icount.buf_overrun); 1971ab4382d2SGreg Kroah-Hartman 1972ab4382d2SGreg Kroah-Hartman #define INFOBIT(bit, str) \ 1973ab4382d2SGreg Kroah-Hartman if (uport->mctrl & (bit)) \ 1974ab4382d2SGreg Kroah-Hartman strncat(stat_buf, (str), sizeof(stat_buf) - \ 1975ab4382d2SGreg Kroah-Hartman strlen(stat_buf) - 2) 1976ab4382d2SGreg Kroah-Hartman #define STATBIT(bit, str) \ 1977ab4382d2SGreg Kroah-Hartman if (status & (bit)) \ 1978ab4382d2SGreg Kroah-Hartman strncat(stat_buf, (str), sizeof(stat_buf) - \ 1979ab4382d2SGreg Kroah-Hartman strlen(stat_buf) - 2) 1980ab4382d2SGreg Kroah-Hartman 1981ab4382d2SGreg Kroah-Hartman stat_buf[0] = '\0'; 1982ab4382d2SGreg Kroah-Hartman stat_buf[1] = '\0'; 1983ab4382d2SGreg Kroah-Hartman INFOBIT(TIOCM_RTS, "|RTS"); 1984ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_CTS, "|CTS"); 1985ab4382d2SGreg Kroah-Hartman INFOBIT(TIOCM_DTR, "|DTR"); 1986ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_DSR, "|DSR"); 1987ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_CAR, "|CD"); 1988ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_RNG, "|RI"); 1989ab4382d2SGreg Kroah-Hartman if (stat_buf[0]) 1990ab4382d2SGreg Kroah-Hartman stat_buf[0] = ' '; 1991ab4382d2SGreg Kroah-Hartman 1992ab4382d2SGreg Kroah-Hartman seq_puts(m, stat_buf); 1993ab4382d2SGreg Kroah-Hartman } 1994ab4382d2SGreg Kroah-Hartman seq_putc(m, '\n'); 1995ab4382d2SGreg Kroah-Hartman #undef STATBIT 1996ab4382d2SGreg Kroah-Hartman #undef INFOBIT 19974047b371SPeter Hurley out: 19984047b371SPeter Hurley mutex_unlock(&port->mutex); 1999ab4382d2SGreg Kroah-Hartman } 2000ab4382d2SGreg Kroah-Hartman 2001ab4382d2SGreg Kroah-Hartman static int uart_proc_show(struct seq_file *m, void *v) 2002ab4382d2SGreg Kroah-Hartman { 2003ab4382d2SGreg Kroah-Hartman struct tty_driver *ttydrv = m->private; 2004ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = ttydrv->driver_state; 2005ab4382d2SGreg Kroah-Hartman int i; 2006ab4382d2SGreg Kroah-Hartman 2007968af298SPeter Hurley seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n", "", "", ""); 2008ab4382d2SGreg Kroah-Hartman for (i = 0; i < drv->nr; i++) 2009ab4382d2SGreg Kroah-Hartman uart_line_info(m, drv, i); 2010ab4382d2SGreg Kroah-Hartman return 0; 2011ab4382d2SGreg Kroah-Hartman } 2012ab4382d2SGreg Kroah-Hartman #endif 2013ab4382d2SGreg Kroah-Hartman 20147a49955aSAndy Shevchenko static inline bool uart_console_enabled(struct uart_port *port) 20157a49955aSAndy Shevchenko { 20167a49955aSAndy Shevchenko return uart_console(port) && (port->cons->flags & CON_ENABLED); 20177a49955aSAndy Shevchenko } 20187a49955aSAndy Shevchenko 2019e0830dbfSJohan Hovold static void uart_port_spin_lock_init(struct uart_port *port) 2020f743061aSAndy Shevchenko { 2021f743061aSAndy Shevchenko spin_lock_init(&port->lock); 2022f743061aSAndy Shevchenko lockdep_set_class(&port->lock, &port_lock_key); 2023f743061aSAndy Shevchenko } 2024f743061aSAndy Shevchenko 2025ab4382d2SGreg Kroah-Hartman #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL) 20261cfe42b7SPeter Hurley /** 2027ab4382d2SGreg Kroah-Hartman * uart_console_write - write a console message to a serial port 2028ab4382d2SGreg Kroah-Hartman * @port: the port to write the message 2029ab4382d2SGreg Kroah-Hartman * @s: array of characters 2030ab4382d2SGreg Kroah-Hartman * @count: number of characters in string to write 203110afbe34SPeter Hurley * @putchar: function to write character to port 2032ab4382d2SGreg Kroah-Hartman */ 2033ab4382d2SGreg Kroah-Hartman void uart_console_write(struct uart_port *port, const char *s, 2034ab4382d2SGreg Kroah-Hartman unsigned int count, 20353f8bab17SJiri Slaby void (*putchar)(struct uart_port *, unsigned char)) 2036ab4382d2SGreg Kroah-Hartman { 2037ab4382d2SGreg Kroah-Hartman unsigned int i; 2038ab4382d2SGreg Kroah-Hartman 2039ab4382d2SGreg Kroah-Hartman for (i = 0; i < count; i++, s++) { 2040ab4382d2SGreg Kroah-Hartman if (*s == '\n') 2041ab4382d2SGreg Kroah-Hartman putchar(port, '\r'); 2042ab4382d2SGreg Kroah-Hartman putchar(port, *s); 2043ab4382d2SGreg Kroah-Hartman } 2044ab4382d2SGreg Kroah-Hartman } 2045ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_console_write); 2046ab4382d2SGreg Kroah-Hartman 2047ab4382d2SGreg Kroah-Hartman /* 2048ab4382d2SGreg Kroah-Hartman * Check whether an invalid uart number has been specified, and 2049ab4382d2SGreg Kroah-Hartman * if so, search for the first available port that does have 2050ab4382d2SGreg Kroah-Hartman * console support. 2051ab4382d2SGreg Kroah-Hartman */ 2052ab4382d2SGreg Kroah-Hartman struct uart_port * __init 2053ab4382d2SGreg Kroah-Hartman uart_get_console(struct uart_port *ports, int nr, struct console *co) 2054ab4382d2SGreg Kroah-Hartman { 2055ab4382d2SGreg Kroah-Hartman int idx = co->index; 2056ab4382d2SGreg Kroah-Hartman 2057ab4382d2SGreg Kroah-Hartman if (idx < 0 || idx >= nr || (ports[idx].iobase == 0 && 2058ab4382d2SGreg Kroah-Hartman ports[idx].membase == NULL)) 2059ab4382d2SGreg Kroah-Hartman for (idx = 0; idx < nr; idx++) 2060ab4382d2SGreg Kroah-Hartman if (ports[idx].iobase != 0 || 2061ab4382d2SGreg Kroah-Hartman ports[idx].membase != NULL) 2062ab4382d2SGreg Kroah-Hartman break; 2063ab4382d2SGreg Kroah-Hartman 2064ab4382d2SGreg Kroah-Hartman co->index = idx; 2065ab4382d2SGreg Kroah-Hartman 2066ab4382d2SGreg Kroah-Hartman return ports + idx; 2067ab4382d2SGreg Kroah-Hartman } 2068ab4382d2SGreg Kroah-Hartman 2069ab4382d2SGreg Kroah-Hartman /** 207073abaf87SPeter Hurley * uart_parse_earlycon - Parse earlycon options 207173abaf87SPeter Hurley * @p: ptr to 2nd field (ie., just beyond '<name>,') 207273abaf87SPeter Hurley * @iotype: ptr for decoded iotype (out) 207373abaf87SPeter Hurley * @addr: ptr for decoded mapbase/iobase (out) 207473abaf87SPeter Hurley * @options: ptr for <options> field; NULL if not present (out) 207573abaf87SPeter Hurley * 207673abaf87SPeter Hurley * Decodes earlycon kernel command line parameters of the form 2077bd94c407SMasahiro Yamada * earlycon=<name>,io|mmio|mmio16|mmio32|mmio32be|mmio32native,<addr>,<options> 2078bd94c407SMasahiro Yamada * console=<name>,io|mmio|mmio16|mmio32|mmio32be|mmio32native,<addr>,<options> 207973abaf87SPeter Hurley * 208073abaf87SPeter Hurley * The optional form 2081ff30283aSRandy Dunlap * 208273abaf87SPeter Hurley * earlycon=<name>,0x<addr>,<options> 208373abaf87SPeter Hurley * console=<name>,0x<addr>,<options> 2084ff30283aSRandy Dunlap * 208573abaf87SPeter Hurley * is also accepted; the returned @iotype will be UPIO_MEM. 208673abaf87SPeter Hurley * 20878b2303deSAlexander Sverdlin * Returns 0 on success or -EINVAL on failure 208873abaf87SPeter Hurley */ 208946e36683SAlexander Sverdlin int uart_parse_earlycon(char *p, unsigned char *iotype, resource_size_t *addr, 209073abaf87SPeter Hurley char **options) 209173abaf87SPeter Hurley { 209273abaf87SPeter Hurley if (strncmp(p, "mmio,", 5) == 0) { 209373abaf87SPeter Hurley *iotype = UPIO_MEM; 209473abaf87SPeter Hurley p += 5; 2095bd94c407SMasahiro Yamada } else if (strncmp(p, "mmio16,", 7) == 0) { 2096bd94c407SMasahiro Yamada *iotype = UPIO_MEM16; 2097bd94c407SMasahiro Yamada p += 7; 209873abaf87SPeter Hurley } else if (strncmp(p, "mmio32,", 7) == 0) { 209973abaf87SPeter Hurley *iotype = UPIO_MEM32; 210073abaf87SPeter Hurley p += 7; 21016e63be3fSNoam Camus } else if (strncmp(p, "mmio32be,", 9) == 0) { 21026e63be3fSNoam Camus *iotype = UPIO_MEM32BE; 21036e63be3fSNoam Camus p += 9; 2104d215d809SMax Filippov } else if (strncmp(p, "mmio32native,", 13) == 0) { 2105d215d809SMax Filippov *iotype = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) ? 2106d215d809SMax Filippov UPIO_MEM32BE : UPIO_MEM32; 2107d215d809SMax Filippov p += 13; 210873abaf87SPeter Hurley } else if (strncmp(p, "io,", 3) == 0) { 210973abaf87SPeter Hurley *iotype = UPIO_PORT; 211073abaf87SPeter Hurley p += 3; 211173abaf87SPeter Hurley } else if (strncmp(p, "0x", 2) == 0) { 211273abaf87SPeter Hurley *iotype = UPIO_MEM; 211373abaf87SPeter Hurley } else { 211473abaf87SPeter Hurley return -EINVAL; 211573abaf87SPeter Hurley } 211673abaf87SPeter Hurley 21178b2303deSAlexander Sverdlin /* 21188b2303deSAlexander Sverdlin * Before you replace it with kstrtoull(), think about options separator 21198b2303deSAlexander Sverdlin * (',') it will not tolerate 21208b2303deSAlexander Sverdlin */ 21218b2303deSAlexander Sverdlin *addr = simple_strtoull(p, NULL, 0); 212273abaf87SPeter Hurley p = strchr(p, ','); 212373abaf87SPeter Hurley if (p) 212473abaf87SPeter Hurley p++; 212573abaf87SPeter Hurley 212673abaf87SPeter Hurley *options = p; 212773abaf87SPeter Hurley return 0; 212873abaf87SPeter Hurley } 212973abaf87SPeter Hurley EXPORT_SYMBOL_GPL(uart_parse_earlycon); 213073abaf87SPeter Hurley 213173abaf87SPeter Hurley /** 213202088ca6SGeert Uytterhoeven * uart_parse_options - Parse serial port baud/parity/bits/flow control. 2133ab4382d2SGreg Kroah-Hartman * @options: pointer to option string 2134ab4382d2SGreg Kroah-Hartman * @baud: pointer to an 'int' variable for the baud rate. 2135ab4382d2SGreg Kroah-Hartman * @parity: pointer to an 'int' variable for the parity. 2136ab4382d2SGreg Kroah-Hartman * @bits: pointer to an 'int' variable for the number of data bits. 2137ab4382d2SGreg Kroah-Hartman * @flow: pointer to an 'int' variable for the flow control character. 2138ab4382d2SGreg Kroah-Hartman * 2139ab4382d2SGreg Kroah-Hartman * uart_parse_options decodes a string containing the serial console 2140ab4382d2SGreg Kroah-Hartman * options. The format of the string is <baud><parity><bits><flow>, 2141ab4382d2SGreg Kroah-Hartman * eg: 115200n8r 2142ab4382d2SGreg Kroah-Hartman */ 2143ab4382d2SGreg Kroah-Hartman void 21440f646b63SPaul Cercueil uart_parse_options(const char *options, int *baud, int *parity, 21450f646b63SPaul Cercueil int *bits, int *flow) 2146ab4382d2SGreg Kroah-Hartman { 21470f646b63SPaul Cercueil const char *s = options; 2148ab4382d2SGreg Kroah-Hartman 2149ab4382d2SGreg Kroah-Hartman *baud = simple_strtoul(s, NULL, 10); 2150ab4382d2SGreg Kroah-Hartman while (*s >= '0' && *s <= '9') 2151ab4382d2SGreg Kroah-Hartman s++; 2152ab4382d2SGreg Kroah-Hartman if (*s) 2153ab4382d2SGreg Kroah-Hartman *parity = *s++; 2154ab4382d2SGreg Kroah-Hartman if (*s) 2155ab4382d2SGreg Kroah-Hartman *bits = *s++ - '0'; 2156ab4382d2SGreg Kroah-Hartman if (*s) 2157ab4382d2SGreg Kroah-Hartman *flow = *s; 2158ab4382d2SGreg Kroah-Hartman } 2159ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_parse_options); 2160ab4382d2SGreg Kroah-Hartman 2161ab4382d2SGreg Kroah-Hartman /** 2162ab4382d2SGreg Kroah-Hartman * uart_set_options - setup the serial console parameters 2163ab4382d2SGreg Kroah-Hartman * @port: pointer to the serial ports uart_port structure 2164ab4382d2SGreg Kroah-Hartman * @co: console pointer 2165ab4382d2SGreg Kroah-Hartman * @baud: baud rate 2166ab4382d2SGreg Kroah-Hartman * @parity: parity character - 'n' (none), 'o' (odd), 'e' (even) 2167ab4382d2SGreg Kroah-Hartman * @bits: number of data bits 2168ab4382d2SGreg Kroah-Hartman * @flow: flow control character - 'r' (rts) 2169ab4382d2SGreg Kroah-Hartman */ 2170ab4382d2SGreg Kroah-Hartman int 2171ab4382d2SGreg Kroah-Hartman uart_set_options(struct uart_port *port, struct console *co, 2172ab4382d2SGreg Kroah-Hartman int baud, int parity, int bits, int flow) 2173ab4382d2SGreg Kroah-Hartman { 2174ab4382d2SGreg Kroah-Hartman struct ktermios termios; 2175ab4382d2SGreg Kroah-Hartman static struct ktermios dummy; 2176ab4382d2SGreg Kroah-Hartman 2177e0830dbfSJohan Hovold /* 2178e0830dbfSJohan Hovold * Ensure that the serial-console lock is initialised early. 2179e0830dbfSJohan Hovold * 2180e0830dbfSJohan Hovold * Note that the console-enabled check is needed because of kgdboc, 2181e0830dbfSJohan Hovold * which can end up calling uart_set_options() for an already enabled 2182e0830dbfSJohan Hovold * console via tty_find_polling_driver() and uart_poll_init(). 2183e0830dbfSJohan Hovold */ 2184e0830dbfSJohan Hovold if (!uart_console_enabled(port) && !port->console_reinit) 2185d2403cadSAndy Shevchenko uart_port_spin_lock_init(port); 2186ab4382d2SGreg Kroah-Hartman 2187ab4382d2SGreg Kroah-Hartman memset(&termios, 0, sizeof(struct ktermios)); 2188ab4382d2SGreg Kroah-Hartman 2189ba47f97aSJeffy Chen termios.c_cflag |= CREAD | HUPCL | CLOCAL; 2190ba47f97aSJeffy Chen tty_termios_encode_baud_rate(&termios, baud, baud); 2191ab4382d2SGreg Kroah-Hartman 2192ab4382d2SGreg Kroah-Hartman if (bits == 7) 2193ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CS7; 2194ab4382d2SGreg Kroah-Hartman else 2195ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CS8; 2196ab4382d2SGreg Kroah-Hartman 2197ab4382d2SGreg Kroah-Hartman switch (parity) { 2198ab4382d2SGreg Kroah-Hartman case 'o': case 'O': 2199ab4382d2SGreg Kroah-Hartman termios.c_cflag |= PARODD; 2200df561f66SGustavo A. R. Silva fallthrough; 2201ab4382d2SGreg Kroah-Hartman case 'e': case 'E': 2202ab4382d2SGreg Kroah-Hartman termios.c_cflag |= PARENB; 2203ab4382d2SGreg Kroah-Hartman break; 2204ab4382d2SGreg Kroah-Hartman } 2205ab4382d2SGreg Kroah-Hartman 2206ab4382d2SGreg Kroah-Hartman if (flow == 'r') 2207ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CRTSCTS; 2208ab4382d2SGreg Kroah-Hartman 2209ab4382d2SGreg Kroah-Hartman /* 2210ab4382d2SGreg Kroah-Hartman * some uarts on other side don't support no flow control. 2211ab4382d2SGreg Kroah-Hartman * So we set * DTR in host uart to make them happy 2212ab4382d2SGreg Kroah-Hartman */ 2213ab4382d2SGreg Kroah-Hartman port->mctrl |= TIOCM_DTR; 2214ab4382d2SGreg Kroah-Hartman 2215ab4382d2SGreg Kroah-Hartman port->ops->set_termios(port, &termios, &dummy); 2216ab4382d2SGreg Kroah-Hartman /* 2217ab4382d2SGreg Kroah-Hartman * Allow the setting of the UART parameters with a NULL console 2218ab4382d2SGreg Kroah-Hartman * too: 2219ab4382d2SGreg Kroah-Hartman */ 2220027b5717SPali Rohár if (co) { 2221ab4382d2SGreg Kroah-Hartman co->cflag = termios.c_cflag; 2222027b5717SPali Rohár co->ispeed = termios.c_ispeed; 2223027b5717SPali Rohár co->ospeed = termios.c_ospeed; 2224027b5717SPali Rohár } 2225ab4382d2SGreg Kroah-Hartman 2226ab4382d2SGreg Kroah-Hartman return 0; 2227ab4382d2SGreg Kroah-Hartman } 2228ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_set_options); 2229ab4382d2SGreg Kroah-Hartman #endif /* CONFIG_SERIAL_CORE_CONSOLE */ 2230ab4382d2SGreg Kroah-Hartman 2231cf75525fSJiri Slaby /** 2232cf75525fSJiri Slaby * uart_change_pm - set power state of the port 2233cf75525fSJiri Slaby * 2234cf75525fSJiri Slaby * @state: port descriptor 2235cf75525fSJiri Slaby * @pm_state: new state 2236cf75525fSJiri Slaby * 2237cf75525fSJiri Slaby * Locking: port->mutex has to be held 2238cf75525fSJiri Slaby */ 22396f538fe3SLinus Walleij static void uart_change_pm(struct uart_state *state, 22406f538fe3SLinus Walleij enum uart_pm_state pm_state) 2241ab4382d2SGreg Kroah-Hartman { 22424047b371SPeter Hurley struct uart_port *port = uart_port_check(state); 2243ab4382d2SGreg Kroah-Hartman 2244ab4382d2SGreg Kroah-Hartman if (state->pm_state != pm_state) { 22454047b371SPeter Hurley if (port && port->ops->pm) 2246ab4382d2SGreg Kroah-Hartman port->ops->pm(port, pm_state, state->pm_state); 2247ab4382d2SGreg Kroah-Hartman state->pm_state = pm_state; 2248ab4382d2SGreg Kroah-Hartman } 2249ab4382d2SGreg Kroah-Hartman } 2250ab4382d2SGreg Kroah-Hartman 2251ab4382d2SGreg Kroah-Hartman struct uart_match { 2252ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2253ab4382d2SGreg Kroah-Hartman struct uart_driver *driver; 2254ab4382d2SGreg Kroah-Hartman }; 2255ab4382d2SGreg Kroah-Hartman 2256ab4382d2SGreg Kroah-Hartman static int serial_match_port(struct device *dev, void *data) 2257ab4382d2SGreg Kroah-Hartman { 2258ab4382d2SGreg Kroah-Hartman struct uart_match *match = data; 2259ab4382d2SGreg Kroah-Hartman struct tty_driver *tty_drv = match->driver->tty_driver; 2260ab4382d2SGreg Kroah-Hartman dev_t devt = MKDEV(tty_drv->major, tty_drv->minor_start) + 2261ab4382d2SGreg Kroah-Hartman match->port->line; 2262ab4382d2SGreg Kroah-Hartman 2263ab4382d2SGreg Kroah-Hartman return dev->devt == devt; /* Actually, only one tty per port */ 2264ab4382d2SGreg Kroah-Hartman } 2265ab4382d2SGreg Kroah-Hartman 2266ab4382d2SGreg Kroah-Hartman int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport) 2267ab4382d2SGreg Kroah-Hartman { 2268ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 2269ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2270ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 2271ab4382d2SGreg Kroah-Hartman struct uart_match match = {uport, drv}; 2272ab4382d2SGreg Kroah-Hartman 2273ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2274ab4382d2SGreg Kroah-Hartman 2275ab4382d2SGreg Kroah-Hartman tty_dev = device_find_child(uport->dev, &match, serial_match_port); 227688e2582eSLucas Stach if (tty_dev && device_may_wakeup(tty_dev)) { 2277aef3ad10SAndy Shevchenko enable_irq_wake(uport->irq); 2278ab4382d2SGreg Kroah-Hartman put_device(tty_dev); 2279ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2280ab4382d2SGreg Kroah-Hartman return 0; 2281ab4382d2SGreg Kroah-Hartman } 22825a65dcc0SFederico Vaga put_device(tty_dev); 22835a65dcc0SFederico Vaga 2284c9d2325cSVijaya Krishna Nivarthi /* 2285c9d2325cSVijaya Krishna Nivarthi * Nothing to do if the console is not suspending 2286c9d2325cSVijaya Krishna Nivarthi * except stop_rx to prevent any asynchronous data 2287c9d2325cSVijaya Krishna Nivarthi * over RX line. Re-start_rx, when required, is 2288c9d2325cSVijaya Krishna Nivarthi * done by set_termios in resume sequence 2289c9d2325cSVijaya Krishna Nivarthi */ 2290c9d2325cSVijaya Krishna Nivarthi if (!console_suspend_enabled && uart_console(uport)) { 2291c9d2325cSVijaya Krishna Nivarthi uport->ops->stop_rx(uport); 2292b164c972SPeter Hurley goto unlock; 2293c9d2325cSVijaya Krishna Nivarthi } 2294b164c972SPeter Hurley 2295ab4382d2SGreg Kroah-Hartman uport->suspended = 1; 2296ab4382d2SGreg Kroah-Hartman 2297d41861caSPeter Hurley if (tty_port_initialized(port)) { 2298ab4382d2SGreg Kroah-Hartman const struct uart_ops *ops = uport->ops; 2299ab4382d2SGreg Kroah-Hartman int tries; 230018c9d4a3SAl Cooper unsigned int mctrl; 2301ab4382d2SGreg Kroah-Hartman 230280f02d54SPeter Hurley tty_port_set_suspended(port, 1); 2303d41861caSPeter Hurley tty_port_set_initialized(port, 0); 2304ab4382d2SGreg Kroah-Hartman 2305ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 2306ab4382d2SGreg Kroah-Hartman ops->stop_tx(uport); 2307ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, 0); 230818c9d4a3SAl Cooper /* save mctrl so it can be restored on resume */ 230918c9d4a3SAl Cooper mctrl = uport->mctrl; 231018c9d4a3SAl Cooper uport->mctrl = 0; 2311ab4382d2SGreg Kroah-Hartman ops->stop_rx(uport); 2312ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2313ab4382d2SGreg Kroah-Hartman 2314ab4382d2SGreg Kroah-Hartman /* 2315ab4382d2SGreg Kroah-Hartman * Wait for the transmitter to empty. 2316ab4382d2SGreg Kroah-Hartman */ 2317ab4382d2SGreg Kroah-Hartman for (tries = 3; !ops->tx_empty(uport) && tries; tries--) 2318ab4382d2SGreg Kroah-Hartman msleep(10); 2319ab4382d2SGreg Kroah-Hartman if (!tries) 2320cade3580SAndy Shevchenko dev_err(uport->dev, "%s: Unable to drain transmitter\n", 2321cade3580SAndy Shevchenko uport->name); 2322ab4382d2SGreg Kroah-Hartman 2323ab4382d2SGreg Kroah-Hartman ops->shutdown(uport); 232418c9d4a3SAl Cooper uport->mctrl = mctrl; 2325ab4382d2SGreg Kroah-Hartman } 2326ab4382d2SGreg Kroah-Hartman 2327ab4382d2SGreg Kroah-Hartman /* 2328ab4382d2SGreg Kroah-Hartman * Disable the console device before suspending. 2329ab4382d2SGreg Kroah-Hartman */ 2330b164c972SPeter Hurley if (uart_console(uport)) 2331ab4382d2SGreg Kroah-Hartman console_stop(uport->cons); 2332ab4382d2SGreg Kroah-Hartman 23336f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_OFF); 2334b164c972SPeter Hurley unlock: 2335ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2336ab4382d2SGreg Kroah-Hartman 2337ab4382d2SGreg Kroah-Hartman return 0; 2338ab4382d2SGreg Kroah-Hartman } 233915dc475bSJiri Slaby EXPORT_SYMBOL(uart_suspend_port); 2340ab4382d2SGreg Kroah-Hartman 2341ab4382d2SGreg Kroah-Hartman int uart_resume_port(struct uart_driver *drv, struct uart_port *uport) 2342ab4382d2SGreg Kroah-Hartman { 2343ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 2344ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2345ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 2346ab4382d2SGreg Kroah-Hartman struct uart_match match = {uport, drv}; 2347ab4382d2SGreg Kroah-Hartman struct ktermios termios; 2348ab4382d2SGreg Kroah-Hartman 2349ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2350ab4382d2SGreg Kroah-Hartman 2351ab4382d2SGreg Kroah-Hartman tty_dev = device_find_child(uport->dev, &match, serial_match_port); 2352ab4382d2SGreg Kroah-Hartman if (!uport->suspended && device_may_wakeup(tty_dev)) { 2353aef3ad10SAndy Shevchenko if (irqd_is_wakeup_set(irq_get_irq_data((uport->irq)))) 2354ab4382d2SGreg Kroah-Hartman disable_irq_wake(uport->irq); 23555a65dcc0SFederico Vaga put_device(tty_dev); 2356ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2357ab4382d2SGreg Kroah-Hartman return 0; 2358ab4382d2SGreg Kroah-Hartman } 23595a65dcc0SFederico Vaga put_device(tty_dev); 2360ab4382d2SGreg Kroah-Hartman uport->suspended = 0; 2361ab4382d2SGreg Kroah-Hartman 2362ab4382d2SGreg Kroah-Hartman /* 2363ab4382d2SGreg Kroah-Hartman * Re-enable the console device after suspending. 2364ab4382d2SGreg Kroah-Hartman */ 23655933a161SYin Kangkai if (uart_console(uport)) { 2366ab4382d2SGreg Kroah-Hartman /* 2367ab4382d2SGreg Kroah-Hartman * First try to use the console cflag setting. 2368ab4382d2SGreg Kroah-Hartman */ 2369ab4382d2SGreg Kroah-Hartman memset(&termios, 0, sizeof(struct ktermios)); 2370ab4382d2SGreg Kroah-Hartman termios.c_cflag = uport->cons->cflag; 2371027b5717SPali Rohár termios.c_ispeed = uport->cons->ispeed; 2372027b5717SPali Rohár termios.c_ospeed = uport->cons->ospeed; 2373ab4382d2SGreg Kroah-Hartman 2374ab4382d2SGreg Kroah-Hartman /* 2375ab4382d2SGreg Kroah-Hartman * If that's unset, use the tty termios setting. 2376ab4382d2SGreg Kroah-Hartman */ 2377adc8d746SAlan Cox if (port->tty && termios.c_cflag == 0) 2378adc8d746SAlan Cox termios = port->tty->termios; 2379ab4382d2SGreg Kroah-Hartman 238094abc56fSNing Jiang if (console_suspend_enabled) 23816f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2382ab4382d2SGreg Kroah-Hartman uport->ops->set_termios(uport, &termios, NULL); 23835933a161SYin Kangkai if (console_suspend_enabled) 2384ab4382d2SGreg Kroah-Hartman console_start(uport->cons); 2385ab4382d2SGreg Kroah-Hartman } 2386ab4382d2SGreg Kroah-Hartman 238780f02d54SPeter Hurley if (tty_port_suspended(port)) { 2388ab4382d2SGreg Kroah-Hartman const struct uart_ops *ops = uport->ops; 2389ab4382d2SGreg Kroah-Hartman int ret; 2390ab4382d2SGreg Kroah-Hartman 23916f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2392ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 2393ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, 0); 2394ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2395ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) { 2396ab4382d2SGreg Kroah-Hartman /* Protected by port mutex for now */ 2397ab4382d2SGreg Kroah-Hartman struct tty_struct *tty = port->tty; 23984ed71addSTamseel Shams 2399ab4382d2SGreg Kroah-Hartman ret = ops->startup(uport); 2400ab4382d2SGreg Kroah-Hartman if (ret == 0) { 2401ab4382d2SGreg Kroah-Hartman if (tty) 2402ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 2403ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 2404ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, uport->mctrl); 2405ab4382d2SGreg Kroah-Hartman ops->start_tx(uport); 2406ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2407d41861caSPeter Hurley tty_port_set_initialized(port, 1); 2408ab4382d2SGreg Kroah-Hartman } else { 2409ab4382d2SGreg Kroah-Hartman /* 2410ab4382d2SGreg Kroah-Hartman * Failed to resume - maybe hardware went away? 2411ab4382d2SGreg Kroah-Hartman * Clear the "initialized" flag so we won't try 2412ab4382d2SGreg Kroah-Hartman * to call the low level drivers shutdown method. 2413ab4382d2SGreg Kroah-Hartman */ 2414ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 2415ab4382d2SGreg Kroah-Hartman } 2416ab4382d2SGreg Kroah-Hartman } 2417ab4382d2SGreg Kroah-Hartman 241880f02d54SPeter Hurley tty_port_set_suspended(port, 0); 2419ab4382d2SGreg Kroah-Hartman } 2420ab4382d2SGreg Kroah-Hartman 2421ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2422ab4382d2SGreg Kroah-Hartman 2423ab4382d2SGreg Kroah-Hartman return 0; 2424ab4382d2SGreg Kroah-Hartman } 242515dc475bSJiri Slaby EXPORT_SYMBOL(uart_resume_port); 2426ab4382d2SGreg Kroah-Hartman 2427ab4382d2SGreg Kroah-Hartman static inline void 2428ab4382d2SGreg Kroah-Hartman uart_report_port(struct uart_driver *drv, struct uart_port *port) 2429ab4382d2SGreg Kroah-Hartman { 2430ab4382d2SGreg Kroah-Hartman char address[64]; 2431ab4382d2SGreg Kroah-Hartman 2432ab4382d2SGreg Kroah-Hartman switch (port->iotype) { 2433ab4382d2SGreg Kroah-Hartman case UPIO_PORT: 2434ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), "I/O 0x%lx", port->iobase); 2435ab4382d2SGreg Kroah-Hartman break; 2436ab4382d2SGreg Kroah-Hartman case UPIO_HUB6: 2437ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), 2438ab4382d2SGreg Kroah-Hartman "I/O 0x%lx offset 0x%x", port->iobase, port->hub6); 2439ab4382d2SGreg Kroah-Hartman break; 2440ab4382d2SGreg Kroah-Hartman case UPIO_MEM: 2441bd94c407SMasahiro Yamada case UPIO_MEM16: 2442ab4382d2SGreg Kroah-Hartman case UPIO_MEM32: 24433ffb1a81SKevin Cernekee case UPIO_MEM32BE: 2444ab4382d2SGreg Kroah-Hartman case UPIO_AU: 2445ab4382d2SGreg Kroah-Hartman case UPIO_TSI: 2446ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), 2447ab4382d2SGreg Kroah-Hartman "MMIO 0x%llx", (unsigned long long)port->mapbase); 2448ab4382d2SGreg Kroah-Hartman break; 2449ab4382d2SGreg Kroah-Hartman default: 2450ab4382d2SGreg Kroah-Hartman strlcpy(address, "*unknown*", sizeof(address)); 2451ab4382d2SGreg Kroah-Hartman break; 2452ab4382d2SGreg Kroah-Hartman } 2453ab4382d2SGreg Kroah-Hartman 2454cade3580SAndy Shevchenko pr_info("%s%s%s at %s (irq = %d, base_baud = %d) is a %s\n", 245568ed7e1cSJames Bottomley port->dev ? dev_name(port->dev) : "", 245668ed7e1cSJames Bottomley port->dev ? ": " : "", 2457cade3580SAndy Shevchenko port->name, 24587d12b976SKees Cook address, port->irq, port->uartclk / 16, uart_type(port)); 2459e7b91932SMaciej W. Rozycki 2460e7b91932SMaciej W. Rozycki /* The magic multiplier feature is a bit obscure, so report it too. */ 2461e7b91932SMaciej W. Rozycki if (port->flags & UPF_MAGIC_MULTIPLIER) 2462e7b91932SMaciej W. Rozycki pr_info("%s%s%s extra baud rates supported: %d, %d", 2463e7b91932SMaciej W. Rozycki port->dev ? dev_name(port->dev) : "", 2464e7b91932SMaciej W. Rozycki port->dev ? ": " : "", 2465e7b91932SMaciej W. Rozycki port->name, 2466e7b91932SMaciej W. Rozycki port->uartclk / 8, port->uartclk / 4); 2467ab4382d2SGreg Kroah-Hartman } 2468ab4382d2SGreg Kroah-Hartman 2469ab4382d2SGreg Kroah-Hartman static void 2470ab4382d2SGreg Kroah-Hartman uart_configure_port(struct uart_driver *drv, struct uart_state *state, 2471ab4382d2SGreg Kroah-Hartman struct uart_port *port) 2472ab4382d2SGreg Kroah-Hartman { 2473ab4382d2SGreg Kroah-Hartman unsigned int flags; 2474ab4382d2SGreg Kroah-Hartman 2475ab4382d2SGreg Kroah-Hartman /* 2476ab4382d2SGreg Kroah-Hartman * If there isn't a port here, don't do anything further. 2477ab4382d2SGreg Kroah-Hartman */ 2478ab4382d2SGreg Kroah-Hartman if (!port->iobase && !port->mapbase && !port->membase) 2479ab4382d2SGreg Kroah-Hartman return; 2480ab4382d2SGreg Kroah-Hartman 2481ab4382d2SGreg Kroah-Hartman /* 2482ab4382d2SGreg Kroah-Hartman * Now do the auto configuration stuff. Note that config_port 2483ab4382d2SGreg Kroah-Hartman * is expected to claim the resources and map the port for us. 2484ab4382d2SGreg Kroah-Hartman */ 2485ab4382d2SGreg Kroah-Hartman flags = 0; 2486ab4382d2SGreg Kroah-Hartman if (port->flags & UPF_AUTO_IRQ) 2487ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_IRQ; 2488ab4382d2SGreg Kroah-Hartman if (port->flags & UPF_BOOT_AUTOCONF) { 2489ab4382d2SGreg Kroah-Hartman if (!(port->flags & UPF_FIXED_TYPE)) { 2490ab4382d2SGreg Kroah-Hartman port->type = PORT_UNKNOWN; 2491ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_TYPE; 2492ab4382d2SGreg Kroah-Hartman } 2493ab4382d2SGreg Kroah-Hartman port->ops->config_port(port, flags); 2494ab4382d2SGreg Kroah-Hartman } 2495ab4382d2SGreg Kroah-Hartman 2496ab4382d2SGreg Kroah-Hartman if (port->type != PORT_UNKNOWN) { 2497ab4382d2SGreg Kroah-Hartman unsigned long flags; 2498ab4382d2SGreg Kroah-Hartman 2499ab4382d2SGreg Kroah-Hartman uart_report_port(drv, port); 2500ab4382d2SGreg Kroah-Hartman 2501ab4382d2SGreg Kroah-Hartman /* Power up port for set_mctrl() */ 25026f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2503ab4382d2SGreg Kroah-Hartman 2504ab4382d2SGreg Kroah-Hartman /* 2505ab4382d2SGreg Kroah-Hartman * Ensure that the modem control lines are de-activated. 2506ab4382d2SGreg Kroah-Hartman * keep the DTR setting that is set in uart_set_options() 2507ab4382d2SGreg Kroah-Hartman * We probably don't need a spinlock around this, but 2508ab4382d2SGreg Kroah-Hartman */ 2509ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 251093a770b7SLukas Wunner port->mctrl &= TIOCM_DTR; 25112dd8a74fSLukas Wunner if (port->rs485.flags & SER_RS485_ENABLED && 25122dd8a74fSLukas Wunner !(port->rs485.flags & SER_RS485_RTS_AFTER_SEND)) 25132dd8a74fSLukas Wunner port->mctrl |= TIOCM_RTS; 251493a770b7SLukas Wunner port->ops->set_mctrl(port, port->mctrl); 2515ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 2516ab4382d2SGreg Kroah-Hartman 2517ab4382d2SGreg Kroah-Hartman /* 2518ab4382d2SGreg Kroah-Hartman * If this driver supports console, and it hasn't been 2519ab4382d2SGreg Kroah-Hartman * successfully registered yet, try to re-register it. 2520ab4382d2SGreg Kroah-Hartman * It may be that the port was not available. 2521ab4382d2SGreg Kroah-Hartman */ 2522ab4382d2SGreg Kroah-Hartman if (port->cons && !(port->cons->flags & CON_ENABLED)) 2523ab4382d2SGreg Kroah-Hartman register_console(port->cons); 2524ab4382d2SGreg Kroah-Hartman 2525ab4382d2SGreg Kroah-Hartman /* 2526ab4382d2SGreg Kroah-Hartman * Power down all ports by default, except the 2527ab4382d2SGreg Kroah-Hartman * console if we have one. 2528ab4382d2SGreg Kroah-Hartman */ 2529ab4382d2SGreg Kroah-Hartman if (!uart_console(port)) 25306f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_OFF); 2531ab4382d2SGreg Kroah-Hartman } 2532ab4382d2SGreg Kroah-Hartman } 2533ab4382d2SGreg Kroah-Hartman 2534ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 2535ab4382d2SGreg Kroah-Hartman 2536ab4382d2SGreg Kroah-Hartman static int uart_poll_init(struct tty_driver *driver, int line, char *options) 2537ab4382d2SGreg Kroah-Hartman { 2538ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2539ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 254049c02304SPeter Hurley struct tty_port *tport; 2541ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2542ab4382d2SGreg Kroah-Hartman int baud = 9600; 2543ab4382d2SGreg Kroah-Hartman int bits = 8; 2544ab4382d2SGreg Kroah-Hartman int parity = 'n'; 2545ab4382d2SGreg Kroah-Hartman int flow = 'n'; 254649c02304SPeter Hurley int ret = 0; 2547ab4382d2SGreg Kroah-Hartman 254849c02304SPeter Hurley tport = &state->port; 254949c02304SPeter Hurley mutex_lock(&tport->mutex); 255049c02304SPeter Hurley 25514047b371SPeter Hurley port = uart_port_check(state); 25524047b371SPeter Hurley if (!port || !(port->ops->poll_get_char && port->ops->poll_put_char)) { 255349c02304SPeter Hurley ret = -1; 255449c02304SPeter Hurley goto out; 255549c02304SPeter Hurley } 2556ab4382d2SGreg Kroah-Hartman 2557c7f3e708SAnton Vorontsov if (port->ops->poll_init) { 2558c7f3e708SAnton Vorontsov /* 2559d41861caSPeter Hurley * We don't set initialized as we only initialized the hw, 2560d41861caSPeter Hurley * e.g. state->xmit is still uninitialized. 2561c7f3e708SAnton Vorontsov */ 2562d41861caSPeter Hurley if (!tty_port_initialized(tport)) 2563c7f3e708SAnton Vorontsov ret = port->ops->poll_init(port); 2564c7f3e708SAnton Vorontsov } 2565c7f3e708SAnton Vorontsov 256649c02304SPeter Hurley if (!ret && options) { 2567ab4382d2SGreg Kroah-Hartman uart_parse_options(options, &baud, &parity, &bits, &flow); 256849c02304SPeter Hurley ret = uart_set_options(port, NULL, baud, parity, bits, flow); 2569ab4382d2SGreg Kroah-Hartman } 257049c02304SPeter Hurley out: 257149c02304SPeter Hurley mutex_unlock(&tport->mutex); 257249c02304SPeter Hurley return ret; 2573ab4382d2SGreg Kroah-Hartman } 2574ab4382d2SGreg Kroah-Hartman 2575ab4382d2SGreg Kroah-Hartman static int uart_poll_get_char(struct tty_driver *driver, int line) 2576ab4382d2SGreg Kroah-Hartman { 2577ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2578ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2579ab4382d2SGreg Kroah-Hartman struct uart_port *port; 25809ed19428SPeter Hurley int ret = -1; 2581ab4382d2SGreg Kroah-Hartman 25829ed19428SPeter Hurley port = uart_port_ref(state); 2583ef510beaSAndy Shevchenko if (port) { 25849ed19428SPeter Hurley ret = port->ops->poll_get_char(port); 25859ed19428SPeter Hurley uart_port_deref(port); 25869ed19428SPeter Hurley } 258722077b09SJiri Slaby 25889ed19428SPeter Hurley return ret; 2589ab4382d2SGreg Kroah-Hartman } 2590ab4382d2SGreg Kroah-Hartman 2591ab4382d2SGreg Kroah-Hartman static void uart_poll_put_char(struct tty_driver *driver, int line, char ch) 2592ab4382d2SGreg Kroah-Hartman { 2593ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2594ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2595ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2596ab4382d2SGreg Kroah-Hartman 25979ed19428SPeter Hurley port = uart_port_ref(state); 25989ed19428SPeter Hurley if (!port) 25999ed19428SPeter Hurley return; 2600c7d44a02SDoug Anderson 2601c7d44a02SDoug Anderson if (ch == '\n') 2602c7d44a02SDoug Anderson port->ops->poll_put_char(port, '\r'); 2603ab4382d2SGreg Kroah-Hartman port->ops->poll_put_char(port, ch); 26049ed19428SPeter Hurley uart_port_deref(port); 2605ab4382d2SGreg Kroah-Hartman } 2606ab4382d2SGreg Kroah-Hartman #endif 2607ab4382d2SGreg Kroah-Hartman 2608ab4382d2SGreg Kroah-Hartman static const struct tty_operations uart_ops = { 26094cdd17baSJiri Slaby .install = uart_install, 2610ab4382d2SGreg Kroah-Hartman .open = uart_open, 2611ab4382d2SGreg Kroah-Hartman .close = uart_close, 2612ab4382d2SGreg Kroah-Hartman .write = uart_write, 2613ab4382d2SGreg Kroah-Hartman .put_char = uart_put_char, 2614ab4382d2SGreg Kroah-Hartman .flush_chars = uart_flush_chars, 2615ab4382d2SGreg Kroah-Hartman .write_room = uart_write_room, 2616ab4382d2SGreg Kroah-Hartman .chars_in_buffer= uart_chars_in_buffer, 2617ab4382d2SGreg Kroah-Hartman .flush_buffer = uart_flush_buffer, 2618ab4382d2SGreg Kroah-Hartman .ioctl = uart_ioctl, 2619ab4382d2SGreg Kroah-Hartman .throttle = uart_throttle, 2620ab4382d2SGreg Kroah-Hartman .unthrottle = uart_unthrottle, 2621ab4382d2SGreg Kroah-Hartman .send_xchar = uart_send_xchar, 2622ab4382d2SGreg Kroah-Hartman .set_termios = uart_set_termios, 2623ab4382d2SGreg Kroah-Hartman .set_ldisc = uart_set_ldisc, 2624ab4382d2SGreg Kroah-Hartman .stop = uart_stop, 2625ab4382d2SGreg Kroah-Hartman .start = uart_start, 2626ab4382d2SGreg Kroah-Hartman .hangup = uart_hangup, 2627ab4382d2SGreg Kroah-Hartman .break_ctl = uart_break_ctl, 2628ab4382d2SGreg Kroah-Hartman .wait_until_sent= uart_wait_until_sent, 2629ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_PROC_FS 26308a8dcabfSChristoph Hellwig .proc_show = uart_proc_show, 2631ab4382d2SGreg Kroah-Hartman #endif 2632ab4382d2SGreg Kroah-Hartman .tiocmget = uart_tiocmget, 2633ab4382d2SGreg Kroah-Hartman .tiocmset = uart_tiocmset, 26345099d234SAl Viro .set_serial = uart_set_info_user, 26355099d234SAl Viro .get_serial = uart_get_info_user, 2636ab4382d2SGreg Kroah-Hartman .get_icount = uart_get_icount, 2637ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 2638ab4382d2SGreg Kroah-Hartman .poll_init = uart_poll_init, 2639ab4382d2SGreg Kroah-Hartman .poll_get_char = uart_poll_get_char, 2640ab4382d2SGreg Kroah-Hartman .poll_put_char = uart_poll_put_char, 2641ab4382d2SGreg Kroah-Hartman #endif 2642ab4382d2SGreg Kroah-Hartman }; 2643ab4382d2SGreg Kroah-Hartman 2644ab4382d2SGreg Kroah-Hartman static const struct tty_port_operations uart_port_ops = { 2645ab4382d2SGreg Kroah-Hartman .carrier_raised = uart_carrier_raised, 2646ab4382d2SGreg Kroah-Hartman .dtr_rts = uart_dtr_rts, 2647b3b57646SRob Herring .activate = uart_port_activate, 2648761ed4a9SRob Herring .shutdown = uart_tty_port_shutdown, 2649ab4382d2SGreg Kroah-Hartman }; 2650ab4382d2SGreg Kroah-Hartman 2651ab4382d2SGreg Kroah-Hartman /** 2652ab4382d2SGreg Kroah-Hartman * uart_register_driver - register a driver with the uart core layer 2653ab4382d2SGreg Kroah-Hartman * @drv: low level driver structure 2654ab4382d2SGreg Kroah-Hartman * 2655ab4382d2SGreg Kroah-Hartman * Register a uart driver with the core driver. We in turn register 2656ab4382d2SGreg Kroah-Hartman * with the tty layer, and initialise the core driver per-port state. 2657ab4382d2SGreg Kroah-Hartman * 2658ab4382d2SGreg Kroah-Hartman * We have a proc file in /proc/tty/driver which is named after the 2659ab4382d2SGreg Kroah-Hartman * normal driver. 2660ab4382d2SGreg Kroah-Hartman * 2661ab4382d2SGreg Kroah-Hartman * drv->port should be NULL, and the per-port structures should be 2662ab4382d2SGreg Kroah-Hartman * registered using uart_add_one_port after this call has succeeded. 2663ab4382d2SGreg Kroah-Hartman */ 2664ab4382d2SGreg Kroah-Hartman int uart_register_driver(struct uart_driver *drv) 2665ab4382d2SGreg Kroah-Hartman { 2666ab4382d2SGreg Kroah-Hartman struct tty_driver *normal; 2667050dfc09SSergey Organov int i, retval = -ENOMEM; 2668ab4382d2SGreg Kroah-Hartman 2669ab4382d2SGreg Kroah-Hartman BUG_ON(drv->state); 2670ab4382d2SGreg Kroah-Hartman 2671ab4382d2SGreg Kroah-Hartman /* 2672ab4382d2SGreg Kroah-Hartman * Maybe we should be using a slab cache for this, especially if 2673ab4382d2SGreg Kroah-Hartman * we have a large number of ports to handle. 2674ab4382d2SGreg Kroah-Hartman */ 26756396bb22SKees Cook drv->state = kcalloc(drv->nr, sizeof(struct uart_state), GFP_KERNEL); 2676ab4382d2SGreg Kroah-Hartman if (!drv->state) 2677ab4382d2SGreg Kroah-Hartman goto out; 2678ab4382d2SGreg Kroah-Hartman 267939b7b42bSJiri Slaby normal = tty_alloc_driver(drv->nr, TTY_DRIVER_REAL_RAW | 268039b7b42bSJiri Slaby TTY_DRIVER_DYNAMIC_DEV); 268139b7b42bSJiri Slaby if (IS_ERR(normal)) { 268239b7b42bSJiri Slaby retval = PTR_ERR(normal); 2683ab4382d2SGreg Kroah-Hartman goto out_kfree; 268439b7b42bSJiri Slaby } 2685ab4382d2SGreg Kroah-Hartman 2686ab4382d2SGreg Kroah-Hartman drv->tty_driver = normal; 2687ab4382d2SGreg Kroah-Hartman 2688ab4382d2SGreg Kroah-Hartman normal->driver_name = drv->driver_name; 2689ab4382d2SGreg Kroah-Hartman normal->name = drv->dev_name; 2690ab4382d2SGreg Kroah-Hartman normal->major = drv->major; 2691ab4382d2SGreg Kroah-Hartman normal->minor_start = drv->minor; 2692ab4382d2SGreg Kroah-Hartman normal->type = TTY_DRIVER_TYPE_SERIAL; 2693ab4382d2SGreg Kroah-Hartman normal->subtype = SERIAL_TYPE_NORMAL; 2694ab4382d2SGreg Kroah-Hartman normal->init_termios = tty_std_termios; 2695ab4382d2SGreg Kroah-Hartman normal->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; 2696ab4382d2SGreg Kroah-Hartman normal->init_termios.c_ispeed = normal->init_termios.c_ospeed = 9600; 2697ab4382d2SGreg Kroah-Hartman normal->driver_state = drv; 2698ab4382d2SGreg Kroah-Hartman tty_set_operations(normal, &uart_ops); 2699ab4382d2SGreg Kroah-Hartman 2700ab4382d2SGreg Kroah-Hartman /* 2701ab4382d2SGreg Kroah-Hartman * Initialise the UART state(s). 2702ab4382d2SGreg Kroah-Hartman */ 2703ab4382d2SGreg Kroah-Hartman for (i = 0; i < drv->nr; i++) { 2704ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + i; 2705ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2706ab4382d2SGreg Kroah-Hartman 2707ab4382d2SGreg Kroah-Hartman tty_port_init(port); 2708ab4382d2SGreg Kroah-Hartman port->ops = &uart_port_ops; 2709ab4382d2SGreg Kroah-Hartman } 2710ab4382d2SGreg Kroah-Hartman 2711ab4382d2SGreg Kroah-Hartman retval = tty_register_driver(normal); 2712ab4382d2SGreg Kroah-Hartman if (retval >= 0) 2713ab4382d2SGreg Kroah-Hartman return retval; 2714ab4382d2SGreg Kroah-Hartman 2715191c5f10SJiri Slaby for (i = 0; i < drv->nr; i++) 2716191c5f10SJiri Slaby tty_port_destroy(&drv->state[i].port); 27179f90a4ddSJiri Slaby tty_driver_kref_put(normal); 2718ab4382d2SGreg Kroah-Hartman out_kfree: 2719ab4382d2SGreg Kroah-Hartman kfree(drv->state); 2720ab4382d2SGreg Kroah-Hartman out: 2721050dfc09SSergey Organov return retval; 2722ab4382d2SGreg Kroah-Hartman } 272315dc475bSJiri Slaby EXPORT_SYMBOL(uart_register_driver); 2724ab4382d2SGreg Kroah-Hartman 2725ab4382d2SGreg Kroah-Hartman /** 2726ab4382d2SGreg Kroah-Hartman * uart_unregister_driver - remove a driver from the uart core layer 2727ab4382d2SGreg Kroah-Hartman * @drv: low level driver structure 2728ab4382d2SGreg Kroah-Hartman * 2729ab4382d2SGreg Kroah-Hartman * Remove all references to a driver from the core driver. The low 2730ab4382d2SGreg Kroah-Hartman * level driver must have removed all its ports via the 2731ab4382d2SGreg Kroah-Hartman * uart_remove_one_port() if it registered them with uart_add_one_port(). 2732ab4382d2SGreg Kroah-Hartman * (ie, drv->port == NULL) 2733ab4382d2SGreg Kroah-Hartman */ 2734ab4382d2SGreg Kroah-Hartman void uart_unregister_driver(struct uart_driver *drv) 2735ab4382d2SGreg Kroah-Hartman { 2736ab4382d2SGreg Kroah-Hartman struct tty_driver *p = drv->tty_driver; 2737191c5f10SJiri Slaby unsigned int i; 2738191c5f10SJiri Slaby 2739ab4382d2SGreg Kroah-Hartman tty_unregister_driver(p); 27409f90a4ddSJiri Slaby tty_driver_kref_put(p); 2741191c5f10SJiri Slaby for (i = 0; i < drv->nr; i++) 2742191c5f10SJiri Slaby tty_port_destroy(&drv->state[i].port); 2743ab4382d2SGreg Kroah-Hartman kfree(drv->state); 27441e66cdedSAlan Cox drv->state = NULL; 2745ab4382d2SGreg Kroah-Hartman drv->tty_driver = NULL; 2746ab4382d2SGreg Kroah-Hartman } 274715dc475bSJiri Slaby EXPORT_SYMBOL(uart_unregister_driver); 2748ab4382d2SGreg Kroah-Hartman 2749ab4382d2SGreg Kroah-Hartman struct tty_driver *uart_console_device(struct console *co, int *index) 2750ab4382d2SGreg Kroah-Hartman { 2751ab4382d2SGreg Kroah-Hartman struct uart_driver *p = co->data; 2752ab4382d2SGreg Kroah-Hartman *index = co->index; 2753ab4382d2SGreg Kroah-Hartman return p->tty_driver; 2754ab4382d2SGreg Kroah-Hartman } 2755488f49acSJohn Stultz EXPORT_SYMBOL_GPL(uart_console_device); 2756ab4382d2SGreg Kroah-Hartman 2757143c02c8SAndy Shevchenko static ssize_t uartclk_show(struct device *dev, 27586915c0e4STomas Hlavacek struct device_attribute *attr, char *buf) 27596915c0e4STomas Hlavacek { 2760bebe73e3SAlan Cox struct serial_struct tmp; 27616915c0e4STomas Hlavacek struct tty_port *port = dev_get_drvdata(dev); 2762b1b79916STomas Hlavacek 27639f109694SAlan Cox uart_get_info(port, &tmp); 27649cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.baud_base * 16); 27656915c0e4STomas Hlavacek } 27666915c0e4STomas Hlavacek 2767143c02c8SAndy Shevchenko static ssize_t type_show(struct device *dev, 2768373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2769373bac4cSAlan Cox { 2770373bac4cSAlan Cox struct serial_struct tmp; 2771373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2772373bac4cSAlan Cox 2773373bac4cSAlan Cox uart_get_info(port, &tmp); 27749cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.type); 2775373bac4cSAlan Cox } 2776143c02c8SAndy Shevchenko 2777143c02c8SAndy Shevchenko static ssize_t line_show(struct device *dev, 2778373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2779373bac4cSAlan Cox { 2780373bac4cSAlan Cox struct serial_struct tmp; 2781373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2782373bac4cSAlan Cox 2783373bac4cSAlan Cox uart_get_info(port, &tmp); 27849cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.line); 2785373bac4cSAlan Cox } 2786373bac4cSAlan Cox 2787143c02c8SAndy Shevchenko static ssize_t port_show(struct device *dev, 2788373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2789373bac4cSAlan Cox { 2790373bac4cSAlan Cox struct serial_struct tmp; 2791373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2792fd985e1dSAndrew Morton unsigned long ioaddr; 2793373bac4cSAlan Cox 2794373bac4cSAlan Cox uart_get_info(port, &tmp); 2795fd985e1dSAndrew Morton ioaddr = tmp.port; 2796fd985e1dSAndrew Morton if (HIGH_BITS_OFFSET) 2797fd985e1dSAndrew Morton ioaddr |= (unsigned long)tmp.port_high << HIGH_BITS_OFFSET; 27989cfbf7a6SAlex Dewar return sprintf(buf, "0x%lX\n", ioaddr); 2799373bac4cSAlan Cox } 2800373bac4cSAlan Cox 2801143c02c8SAndy Shevchenko static ssize_t irq_show(struct device *dev, 2802373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2803373bac4cSAlan Cox { 2804373bac4cSAlan Cox struct serial_struct tmp; 2805373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2806373bac4cSAlan Cox 2807373bac4cSAlan Cox uart_get_info(port, &tmp); 28089cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.irq); 2809373bac4cSAlan Cox } 2810373bac4cSAlan Cox 2811143c02c8SAndy Shevchenko static ssize_t flags_show(struct device *dev, 2812373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2813373bac4cSAlan Cox { 2814373bac4cSAlan Cox struct serial_struct tmp; 2815373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2816373bac4cSAlan Cox 2817373bac4cSAlan Cox uart_get_info(port, &tmp); 28189cfbf7a6SAlex Dewar return sprintf(buf, "0x%X\n", tmp.flags); 2819373bac4cSAlan Cox } 2820373bac4cSAlan Cox 2821143c02c8SAndy Shevchenko static ssize_t xmit_fifo_size_show(struct device *dev, 2822373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2823373bac4cSAlan Cox { 2824373bac4cSAlan Cox struct serial_struct tmp; 2825373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2826373bac4cSAlan Cox 2827373bac4cSAlan Cox uart_get_info(port, &tmp); 28289cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.xmit_fifo_size); 2829373bac4cSAlan Cox } 2830373bac4cSAlan Cox 2831143c02c8SAndy Shevchenko static ssize_t close_delay_show(struct device *dev, 2832373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2833373bac4cSAlan Cox { 2834373bac4cSAlan Cox struct serial_struct tmp; 2835373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2836373bac4cSAlan Cox 2837373bac4cSAlan Cox uart_get_info(port, &tmp); 28389cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.close_delay); 2839373bac4cSAlan Cox } 2840373bac4cSAlan Cox 2841143c02c8SAndy Shevchenko static ssize_t closing_wait_show(struct device *dev, 2842373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2843373bac4cSAlan Cox { 2844373bac4cSAlan Cox struct serial_struct tmp; 2845373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2846373bac4cSAlan Cox 2847373bac4cSAlan Cox uart_get_info(port, &tmp); 28489cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.closing_wait); 2849373bac4cSAlan Cox } 2850373bac4cSAlan Cox 2851143c02c8SAndy Shevchenko static ssize_t custom_divisor_show(struct device *dev, 2852373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2853373bac4cSAlan Cox { 2854373bac4cSAlan Cox struct serial_struct tmp; 2855373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2856373bac4cSAlan Cox 2857373bac4cSAlan Cox uart_get_info(port, &tmp); 28589cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.custom_divisor); 2859373bac4cSAlan Cox } 2860373bac4cSAlan Cox 2861143c02c8SAndy Shevchenko static ssize_t io_type_show(struct device *dev, 2862373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2863373bac4cSAlan Cox { 2864373bac4cSAlan Cox struct serial_struct tmp; 2865373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2866373bac4cSAlan Cox 2867373bac4cSAlan Cox uart_get_info(port, &tmp); 28689cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.io_type); 2869373bac4cSAlan Cox } 2870373bac4cSAlan Cox 2871143c02c8SAndy Shevchenko static ssize_t iomem_base_show(struct device *dev, 2872373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2873373bac4cSAlan Cox { 2874373bac4cSAlan Cox struct serial_struct tmp; 2875373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2876373bac4cSAlan Cox 2877373bac4cSAlan Cox uart_get_info(port, &tmp); 28789cfbf7a6SAlex Dewar return sprintf(buf, "0x%lX\n", (unsigned long)tmp.iomem_base); 2879373bac4cSAlan Cox } 2880373bac4cSAlan Cox 2881143c02c8SAndy Shevchenko static ssize_t iomem_reg_shift_show(struct device *dev, 2882373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2883373bac4cSAlan Cox { 2884373bac4cSAlan Cox struct serial_struct tmp; 2885373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2886373bac4cSAlan Cox 2887373bac4cSAlan Cox uart_get_info(port, &tmp); 28889cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.iomem_reg_shift); 2889373bac4cSAlan Cox } 2890373bac4cSAlan Cox 2891a3cb39d2SAndy Shevchenko static ssize_t console_show(struct device *dev, 2892a3cb39d2SAndy Shevchenko struct device_attribute *attr, char *buf) 2893a3cb39d2SAndy Shevchenko { 2894a3cb39d2SAndy Shevchenko struct tty_port *port = dev_get_drvdata(dev); 2895a3cb39d2SAndy Shevchenko struct uart_state *state = container_of(port, struct uart_state, port); 2896a3cb39d2SAndy Shevchenko struct uart_port *uport; 2897a3cb39d2SAndy Shevchenko bool console = false; 2898a3cb39d2SAndy Shevchenko 2899a3cb39d2SAndy Shevchenko mutex_lock(&port->mutex); 2900a3cb39d2SAndy Shevchenko uport = uart_port_check(state); 2901a3cb39d2SAndy Shevchenko if (uport) 2902a3cb39d2SAndy Shevchenko console = uart_console_enabled(uport); 2903a3cb39d2SAndy Shevchenko mutex_unlock(&port->mutex); 2904a3cb39d2SAndy Shevchenko 2905a3cb39d2SAndy Shevchenko return sprintf(buf, "%c\n", console ? 'Y' : 'N'); 2906a3cb39d2SAndy Shevchenko } 2907a3cb39d2SAndy Shevchenko 2908a3cb39d2SAndy Shevchenko static ssize_t console_store(struct device *dev, 2909a3cb39d2SAndy Shevchenko struct device_attribute *attr, const char *buf, size_t count) 2910a3cb39d2SAndy Shevchenko { 2911a3cb39d2SAndy Shevchenko struct tty_port *port = dev_get_drvdata(dev); 2912a3cb39d2SAndy Shevchenko struct uart_state *state = container_of(port, struct uart_state, port); 2913a3cb39d2SAndy Shevchenko struct uart_port *uport; 2914a3cb39d2SAndy Shevchenko bool oldconsole, newconsole; 2915a3cb39d2SAndy Shevchenko int ret; 2916a3cb39d2SAndy Shevchenko 2917a3cb39d2SAndy Shevchenko ret = kstrtobool(buf, &newconsole); 2918a3cb39d2SAndy Shevchenko if (ret) 2919a3cb39d2SAndy Shevchenko return ret; 2920a3cb39d2SAndy Shevchenko 2921a3cb39d2SAndy Shevchenko mutex_lock(&port->mutex); 2922a3cb39d2SAndy Shevchenko uport = uart_port_check(state); 2923a3cb39d2SAndy Shevchenko if (uport) { 2924a3cb39d2SAndy Shevchenko oldconsole = uart_console_enabled(uport); 2925a3cb39d2SAndy Shevchenko if (oldconsole && !newconsole) { 2926a3cb39d2SAndy Shevchenko ret = unregister_console(uport->cons); 2927a3cb39d2SAndy Shevchenko } else if (!oldconsole && newconsole) { 2928e0830dbfSJohan Hovold if (uart_console(uport)) { 2929e0830dbfSJohan Hovold uport->console_reinit = 1; 2930a3cb39d2SAndy Shevchenko register_console(uport->cons); 2931e0830dbfSJohan Hovold } else { 2932a3cb39d2SAndy Shevchenko ret = -ENOENT; 2933a3cb39d2SAndy Shevchenko } 2934e0830dbfSJohan Hovold } 2935a3cb39d2SAndy Shevchenko } else { 2936a3cb39d2SAndy Shevchenko ret = -ENXIO; 2937a3cb39d2SAndy Shevchenko } 2938a3cb39d2SAndy Shevchenko mutex_unlock(&port->mutex); 2939a3cb39d2SAndy Shevchenko 2940a3cb39d2SAndy Shevchenko return ret < 0 ? ret : count; 2941a3cb39d2SAndy Shevchenko } 2942a3cb39d2SAndy Shevchenko 2943143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(uartclk); 2944143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(type); 2945143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(line); 2946143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(port); 2947143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(irq); 2948143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(flags); 2949143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(xmit_fifo_size); 2950143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(close_delay); 2951143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(closing_wait); 2952143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(custom_divisor); 2953143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(io_type); 2954143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(iomem_base); 2955143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(iomem_reg_shift); 2956a3cb39d2SAndy Shevchenko static DEVICE_ATTR_RW(console); 29576915c0e4STomas Hlavacek 29586915c0e4STomas Hlavacek static struct attribute *tty_dev_attrs[] = { 2959143c02c8SAndy Shevchenko &dev_attr_uartclk.attr, 2960373bac4cSAlan Cox &dev_attr_type.attr, 2961373bac4cSAlan Cox &dev_attr_line.attr, 2962373bac4cSAlan Cox &dev_attr_port.attr, 2963373bac4cSAlan Cox &dev_attr_irq.attr, 2964373bac4cSAlan Cox &dev_attr_flags.attr, 2965373bac4cSAlan Cox &dev_attr_xmit_fifo_size.attr, 2966373bac4cSAlan Cox &dev_attr_close_delay.attr, 2967373bac4cSAlan Cox &dev_attr_closing_wait.attr, 2968373bac4cSAlan Cox &dev_attr_custom_divisor.attr, 2969373bac4cSAlan Cox &dev_attr_io_type.attr, 2970373bac4cSAlan Cox &dev_attr_iomem_base.attr, 2971373bac4cSAlan Cox &dev_attr_iomem_reg_shift.attr, 2972a3cb39d2SAndy Shevchenko &dev_attr_console.attr, 2973a3cb39d2SAndy Shevchenko NULL 29746915c0e4STomas Hlavacek }; 29756915c0e4STomas Hlavacek 2976b1b79916STomas Hlavacek static const struct attribute_group tty_dev_attr_group = { 29776915c0e4STomas Hlavacek .attrs = tty_dev_attrs, 29786915c0e4STomas Hlavacek }; 29796915c0e4STomas Hlavacek 2980ab4382d2SGreg Kroah-Hartman /** 2981ab4382d2SGreg Kroah-Hartman * uart_add_one_port - attach a driver-defined port structure 2982ab4382d2SGreg Kroah-Hartman * @drv: pointer to the uart low level driver structure for this port 2983ab4382d2SGreg Kroah-Hartman * @uport: uart port structure to use for this port. 2984ab4382d2SGreg Kroah-Hartman * 2985a157270fSAhmed S. Darwish * Context: task context, might sleep 2986a157270fSAhmed S. Darwish * 2987ab4382d2SGreg Kroah-Hartman * This allows the driver to register its own uart_port structure 2988ab4382d2SGreg Kroah-Hartman * with the core driver. The main purpose is to allow the low 2989ab4382d2SGreg Kroah-Hartman * level uart drivers to expand uart_port, rather than having yet 2990ab4382d2SGreg Kroah-Hartman * more levels of structures. 2991ab4382d2SGreg Kroah-Hartman */ 2992ab4382d2SGreg Kroah-Hartman int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport) 2993ab4382d2SGreg Kroah-Hartman { 2994ab4382d2SGreg Kroah-Hartman struct uart_state *state; 2995ab4382d2SGreg Kroah-Hartman struct tty_port *port; 2996ab4382d2SGreg Kroah-Hartman int ret = 0; 2997ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 2998266dcff0SGreg Kroah-Hartman int num_groups; 2999ab4382d2SGreg Kroah-Hartman 3000ab4382d2SGreg Kroah-Hartman if (uport->line >= drv->nr) 3001ab4382d2SGreg Kroah-Hartman return -EINVAL; 3002ab4382d2SGreg Kroah-Hartman 3003ab4382d2SGreg Kroah-Hartman state = drv->state + uport->line; 3004ab4382d2SGreg Kroah-Hartman port = &state->port; 3005ab4382d2SGreg Kroah-Hartman 3006ab4382d2SGreg Kroah-Hartman mutex_lock(&port_mutex); 3007ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 3008ab4382d2SGreg Kroah-Hartman if (state->uart_port) { 3009ab4382d2SGreg Kroah-Hartman ret = -EINVAL; 3010ab4382d2SGreg Kroah-Hartman goto out; 3011ab4382d2SGreg Kroah-Hartman } 3012ab4382d2SGreg Kroah-Hartman 30132b702b9bSPeter Hurley /* Link the port to the driver state table and vice versa */ 30149ed19428SPeter Hurley atomic_set(&state->refcount, 1); 30159ed19428SPeter Hurley init_waitqueue_head(&state->remove_wait); 3016ab4382d2SGreg Kroah-Hartman state->uart_port = uport; 3017ab4382d2SGreg Kroah-Hartman uport->state = state; 3018ab4382d2SGreg Kroah-Hartman 30192b702b9bSPeter Hurley state->pm_state = UART_PM_STATE_UNDEFINED; 30202b702b9bSPeter Hurley uport->cons = drv->cons; 3021959801feSPeter Hurley uport->minor = drv->tty_driver->minor_start + uport->line; 3022f7048b15SVignesh R uport->name = kasprintf(GFP_KERNEL, "%s%d", drv->dev_name, 3023f7048b15SVignesh R drv->tty_driver->name_base + uport->line); 3024f7048b15SVignesh R if (!uport->name) { 3025f7048b15SVignesh R ret = -ENOMEM; 3026f7048b15SVignesh R goto out; 3027f7048b15SVignesh R } 30282b702b9bSPeter Hurley 3029fe88c648SJohan Hovold /* 3030fe88c648SJohan Hovold * If this port is in use as a console then the spinlock is already 3031fe88c648SJohan Hovold * initialised. 3032fe88c648SJohan Hovold */ 3033fe88c648SJohan Hovold if (!uart_console_enabled(uport)) 3034d2403cadSAndy Shevchenko uart_port_spin_lock_init(uport); 3035d2403cadSAndy Shevchenko 3036a208ffd2SGrant Likely if (uport->cons && uport->dev) 3037dd8b7a1dSMichal Simek of_console_check(uport->dev->of_node, uport->cons->name, uport->line); 3038ab4382d2SGreg Kroah-Hartman 3039fb2b9001SSudip Mukherjee tty_port_link_device(port, drv->tty_driver, uport->line); 3040ab4382d2SGreg Kroah-Hartman uart_configure_port(drv, state, uport); 3041ab4382d2SGreg Kroah-Hartman 30424dda864dSGeert Uytterhoeven port->console = uart_console(uport); 30434dda864dSGeert Uytterhoeven 3044266dcff0SGreg Kroah-Hartman num_groups = 2; 3045266dcff0SGreg Kroah-Hartman if (uport->attr_group) 3046266dcff0SGreg Kroah-Hartman num_groups++; 3047266dcff0SGreg Kroah-Hartman 3048c2b703b8SYoshihiro YUNOMAE uport->tty_groups = kcalloc(num_groups, sizeof(*uport->tty_groups), 3049266dcff0SGreg Kroah-Hartman GFP_KERNEL); 3050266dcff0SGreg Kroah-Hartman if (!uport->tty_groups) { 3051266dcff0SGreg Kroah-Hartman ret = -ENOMEM; 3052266dcff0SGreg Kroah-Hartman goto out; 3053266dcff0SGreg Kroah-Hartman } 3054266dcff0SGreg Kroah-Hartman uport->tty_groups[0] = &tty_dev_attr_group; 3055266dcff0SGreg Kroah-Hartman if (uport->attr_group) 3056266dcff0SGreg Kroah-Hartman uport->tty_groups[1] = uport->attr_group; 3057266dcff0SGreg Kroah-Hartman 3058ab4382d2SGreg Kroah-Hartman /* 3059ab4382d2SGreg Kroah-Hartman * Register the port whether it's detected or not. This allows 3060015355b7SGeert Uytterhoeven * setserial to be used to alter this port's parameters. 3061ab4382d2SGreg Kroah-Hartman */ 3062da4c2799SJohan Hovold tty_dev = tty_port_register_device_attr_serdev(port, drv->tty_driver, 3063266dcff0SGreg Kroah-Hartman uport->line, uport->dev, port, uport->tty_groups); 3064b289c496SChengguang Xu if (!IS_ERR(tty_dev)) { 306577359835SSimon Glass device_set_wakeup_capable(tty_dev, 1); 306677359835SSimon Glass } else { 30672f2dafe7SSudip Mukherjee dev_err(uport->dev, "Cannot register tty device on line %d\n", 3068ab4382d2SGreg Kroah-Hartman uport->line); 306977359835SSimon Glass } 3070ab4382d2SGreg Kroah-Hartman 3071ab4382d2SGreg Kroah-Hartman /* 3072ab4382d2SGreg Kroah-Hartman * Ensure UPF_DEAD is not set. 3073ab4382d2SGreg Kroah-Hartman */ 3074ab4382d2SGreg Kroah-Hartman uport->flags &= ~UPF_DEAD; 3075ab4382d2SGreg Kroah-Hartman 3076ab4382d2SGreg Kroah-Hartman out: 3077ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 3078ab4382d2SGreg Kroah-Hartman mutex_unlock(&port_mutex); 3079ab4382d2SGreg Kroah-Hartman 3080ab4382d2SGreg Kroah-Hartman return ret; 3081ab4382d2SGreg Kroah-Hartman } 308215dc475bSJiri Slaby EXPORT_SYMBOL(uart_add_one_port); 3083ab4382d2SGreg Kroah-Hartman 3084ab4382d2SGreg Kroah-Hartman /** 3085ab4382d2SGreg Kroah-Hartman * uart_remove_one_port - detach a driver defined port structure 3086ab4382d2SGreg Kroah-Hartman * @drv: pointer to the uart low level driver structure for this port 3087ab4382d2SGreg Kroah-Hartman * @uport: uart port structure for this port 3088ab4382d2SGreg Kroah-Hartman * 3089a157270fSAhmed S. Darwish * Context: task context, might sleep 3090a157270fSAhmed S. Darwish * 3091ab4382d2SGreg Kroah-Hartman * This unhooks (and hangs up) the specified port structure from the 3092ab4382d2SGreg Kroah-Hartman * core driver. No further calls will be made to the low-level code 3093ab4382d2SGreg Kroah-Hartman * for this port. 3094ab4382d2SGreg Kroah-Hartman */ 3095ab4382d2SGreg Kroah-Hartman int uart_remove_one_port(struct uart_driver *drv, struct uart_port *uport) 3096ab4382d2SGreg Kroah-Hartman { 3097ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 3098ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 30994047b371SPeter Hurley struct uart_port *uart_port; 31004c6d5b4dSGeert Uytterhoeven struct tty_struct *tty; 3101b342dd51SChen Gang int ret = 0; 3102ab4382d2SGreg Kroah-Hartman 3103ab4382d2SGreg Kroah-Hartman mutex_lock(&port_mutex); 3104ab4382d2SGreg Kroah-Hartman 3105ab4382d2SGreg Kroah-Hartman /* 3106ab4382d2SGreg Kroah-Hartman * Mark the port "dead" - this prevents any opens from 3107ab4382d2SGreg Kroah-Hartman * succeeding while we shut down the port. 3108ab4382d2SGreg Kroah-Hartman */ 3109ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 31104047b371SPeter Hurley uart_port = uart_port_check(state); 31114047b371SPeter Hurley if (uart_port != uport) 31124047b371SPeter Hurley dev_alert(uport->dev, "Removing wrong port: %p != %p\n", 31134047b371SPeter Hurley uart_port, uport); 31144047b371SPeter Hurley 31154047b371SPeter Hurley if (!uart_port) { 3116b342dd51SChen Gang mutex_unlock(&port->mutex); 3117b342dd51SChen Gang ret = -EINVAL; 3118b342dd51SChen Gang goto out; 3119b342dd51SChen Gang } 3120ab4382d2SGreg Kroah-Hartman uport->flags |= UPF_DEAD; 3121ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 3122ab4382d2SGreg Kroah-Hartman 3123ab4382d2SGreg Kroah-Hartman /* 3124ab4382d2SGreg Kroah-Hartman * Remove the devices from the tty layer 3125ab4382d2SGreg Kroah-Hartman */ 3126da4c2799SJohan Hovold tty_port_unregister_device(port, drv->tty_driver, uport->line); 3127ab4382d2SGreg Kroah-Hartman 31284c6d5b4dSGeert Uytterhoeven tty = tty_port_tty_get(port); 31294c6d5b4dSGeert Uytterhoeven if (tty) { 3130ab4382d2SGreg Kroah-Hartman tty_vhangup(port->tty); 31314c6d5b4dSGeert Uytterhoeven tty_kref_put(tty); 31324c6d5b4dSGeert Uytterhoeven } 3133ab4382d2SGreg Kroah-Hartman 3134ab4382d2SGreg Kroah-Hartman /* 31355f5c9ae5SGeert Uytterhoeven * If the port is used as a console, unregister it 31365f5c9ae5SGeert Uytterhoeven */ 31375f5c9ae5SGeert Uytterhoeven if (uart_console(uport)) 31385f5c9ae5SGeert Uytterhoeven unregister_console(uport->cons); 31395f5c9ae5SGeert Uytterhoeven 31405f5c9ae5SGeert Uytterhoeven /* 3141ab4382d2SGreg Kroah-Hartman * Free the port IO and memory resources, if any. 3142ab4382d2SGreg Kroah-Hartman */ 3143a7cfaf16SFabio Estevam if (uport->type != PORT_UNKNOWN && uport->ops->release_port) 3144ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 3145266dcff0SGreg Kroah-Hartman kfree(uport->tty_groups); 3146f7048b15SVignesh R kfree(uport->name); 3147ab4382d2SGreg Kroah-Hartman 3148ab4382d2SGreg Kroah-Hartman /* 3149ab4382d2SGreg Kroah-Hartman * Indicate that there isn't a port here anymore. 3150ab4382d2SGreg Kroah-Hartman */ 3151ab4382d2SGreg Kroah-Hartman uport->type = PORT_UNKNOWN; 3152ab4382d2SGreg Kroah-Hartman 31534047b371SPeter Hurley mutex_lock(&port->mutex); 31549ed19428SPeter Hurley WARN_ON(atomic_dec_return(&state->refcount) < 0); 31559ed19428SPeter Hurley wait_event(state->remove_wait, !atomic_read(&state->refcount)); 3156ab4382d2SGreg Kroah-Hartman state->uart_port = NULL; 31574047b371SPeter Hurley mutex_unlock(&port->mutex); 3158b342dd51SChen Gang out: 3159ab4382d2SGreg Kroah-Hartman mutex_unlock(&port_mutex); 3160ab4382d2SGreg Kroah-Hartman 3161b342dd51SChen Gang return ret; 3162ab4382d2SGreg Kroah-Hartman } 316315dc475bSJiri Slaby EXPORT_SYMBOL(uart_remove_one_port); 3164ab4382d2SGreg Kroah-Hartman 3165ab4382d2SGreg Kroah-Hartman /* 3166ab4382d2SGreg Kroah-Hartman * Are the two ports equivalent? 3167ab4382d2SGreg Kroah-Hartman */ 3168b8be5db5SJiri Slaby bool uart_match_port(const struct uart_port *port1, 3169b8be5db5SJiri Slaby const struct uart_port *port2) 3170ab4382d2SGreg Kroah-Hartman { 3171ab4382d2SGreg Kroah-Hartman if (port1->iotype != port2->iotype) 3172b8be5db5SJiri Slaby return false; 3173ab4382d2SGreg Kroah-Hartman 3174ab4382d2SGreg Kroah-Hartman switch (port1->iotype) { 3175ab4382d2SGreg Kroah-Hartman case UPIO_PORT: 3176b8be5db5SJiri Slaby return port1->iobase == port2->iobase; 3177ab4382d2SGreg Kroah-Hartman case UPIO_HUB6: 3178b8be5db5SJiri Slaby return port1->iobase == port2->iobase && 3179b8be5db5SJiri Slaby port1->hub6 == port2->hub6; 3180ab4382d2SGreg Kroah-Hartman case UPIO_MEM: 3181bd94c407SMasahiro Yamada case UPIO_MEM16: 3182ab4382d2SGreg Kroah-Hartman case UPIO_MEM32: 31833ffb1a81SKevin Cernekee case UPIO_MEM32BE: 3184ab4382d2SGreg Kroah-Hartman case UPIO_AU: 3185ab4382d2SGreg Kroah-Hartman case UPIO_TSI: 3186b8be5db5SJiri Slaby return port1->mapbase == port2->mapbase; 3187ab4382d2SGreg Kroah-Hartman } 3188b8be5db5SJiri Slaby 3189b8be5db5SJiri Slaby return false; 3190ab4382d2SGreg Kroah-Hartman } 3191ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_match_port); 3192ab4382d2SGreg Kroah-Hartman 3193027d7dacSJiri Slaby /** 3194027d7dacSJiri Slaby * uart_handle_dcd_change - handle a change of carrier detect state 3195027d7dacSJiri Slaby * @uport: uart_port structure for the open port 3196027d7dacSJiri Slaby * @status: new carrier detect status, nonzero if active 31974d90bb14SPeter Hurley * 31984d90bb14SPeter Hurley * Caller must hold uport->lock 3199027d7dacSJiri Slaby */ 3200027d7dacSJiri Slaby void uart_handle_dcd_change(struct uart_port *uport, unsigned int status) 3201027d7dacSJiri Slaby { 320242381572SGeorge Spelvin struct tty_port *port = &uport->state->port; 320343eca0aeSAlan Cox struct tty_struct *tty = port->tty; 3204c993257bSPeter Hurley struct tty_ldisc *ld; 3205027d7dacSJiri Slaby 32064d90bb14SPeter Hurley lockdep_assert_held_once(&uport->lock); 32074d90bb14SPeter Hurley 3208c993257bSPeter Hurley if (tty) { 3209c993257bSPeter Hurley ld = tty_ldisc_ref(tty); 321042381572SGeorge Spelvin if (ld) { 321142381572SGeorge Spelvin if (ld->ops->dcd_change) 3212593fb1aeSGeorge Spelvin ld->ops->dcd_change(tty, status); 321342381572SGeorge Spelvin tty_ldisc_deref(ld); 321442381572SGeorge Spelvin } 3215c993257bSPeter Hurley } 3216027d7dacSJiri Slaby 3217027d7dacSJiri Slaby uport->icount.dcd++; 3218027d7dacSJiri Slaby 3219299245a1SPeter Hurley if (uart_dcd_enabled(uport)) { 3220027d7dacSJiri Slaby if (status) 3221027d7dacSJiri Slaby wake_up_interruptible(&port->open_wait); 322243eca0aeSAlan Cox else if (tty) 322343eca0aeSAlan Cox tty_hangup(tty); 3224027d7dacSJiri Slaby } 3225027d7dacSJiri Slaby } 3226027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_handle_dcd_change); 3227027d7dacSJiri Slaby 3228027d7dacSJiri Slaby /** 3229027d7dacSJiri Slaby * uart_handle_cts_change - handle a change of clear-to-send state 3230027d7dacSJiri Slaby * @uport: uart_port structure for the open port 3231027d7dacSJiri Slaby * @status: new clear to send status, nonzero if active 32324d90bb14SPeter Hurley * 32334d90bb14SPeter Hurley * Caller must hold uport->lock 3234027d7dacSJiri Slaby */ 3235027d7dacSJiri Slaby void uart_handle_cts_change(struct uart_port *uport, unsigned int status) 3236027d7dacSJiri Slaby { 32374d90bb14SPeter Hurley lockdep_assert_held_once(&uport->lock); 32384d90bb14SPeter Hurley 3239027d7dacSJiri Slaby uport->icount.cts++; 3240027d7dacSJiri Slaby 3241391f93f2SPeter Hurley if (uart_softcts_mode(uport)) { 3242d01f4d18SPeter Hurley if (uport->hw_stopped) { 3243027d7dacSJiri Slaby if (status) { 3244d01f4d18SPeter Hurley uport->hw_stopped = 0; 3245027d7dacSJiri Slaby uport->ops->start_tx(uport); 3246027d7dacSJiri Slaby uart_write_wakeup(uport); 3247027d7dacSJiri Slaby } 3248027d7dacSJiri Slaby } else { 3249027d7dacSJiri Slaby if (!status) { 3250d01f4d18SPeter Hurley uport->hw_stopped = 1; 3251027d7dacSJiri Slaby uport->ops->stop_tx(uport); 3252027d7dacSJiri Slaby } 3253027d7dacSJiri Slaby } 3254391f93f2SPeter Hurley 3255027d7dacSJiri Slaby } 3256027d7dacSJiri Slaby } 3257027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_handle_cts_change); 3258027d7dacSJiri Slaby 3259cf75525fSJiri Slaby /** 3260cf75525fSJiri Slaby * uart_insert_char - push a char to the uart layer 3261cf75525fSJiri Slaby * 3262cf75525fSJiri Slaby * User is responsible to call tty_flip_buffer_push when they are done with 3263cf75525fSJiri Slaby * insertion. 3264cf75525fSJiri Slaby * 3265cf75525fSJiri Slaby * @port: corresponding port 3266cf75525fSJiri Slaby * @status: state of the serial port RX buffer (LSR for 8250) 3267cf75525fSJiri Slaby * @overrun: mask of overrun bits in @status 3268cf75525fSJiri Slaby * @ch: character to push 3269cf75525fSJiri Slaby * @flag: flag for the character (see TTY_NORMAL and friends) 3270cf75525fSJiri Slaby */ 3271027d7dacSJiri Slaby void uart_insert_char(struct uart_port *port, unsigned int status, 3272027d7dacSJiri Slaby unsigned int overrun, unsigned int ch, unsigned int flag) 3273027d7dacSJiri Slaby { 327492a19f9cSJiri Slaby struct tty_port *tport = &port->state->port; 3275027d7dacSJiri Slaby 3276027d7dacSJiri Slaby if ((status & port->ignore_status_mask & ~overrun) == 0) 327792a19f9cSJiri Slaby if (tty_insert_flip_char(tport, ch, flag) == 0) 3278dabfb351SCorbin ++port->icount.buf_overrun; 3279027d7dacSJiri Slaby 3280027d7dacSJiri Slaby /* 3281027d7dacSJiri Slaby * Overrun is special. Since it's reported immediately, 3282027d7dacSJiri Slaby * it doesn't affect the current character. 3283027d7dacSJiri Slaby */ 3284027d7dacSJiri Slaby if (status & ~port->ignore_status_mask & overrun) 328592a19f9cSJiri Slaby if (tty_insert_flip_char(tport, 0, TTY_OVERRUN) == 0) 3286dabfb351SCorbin ++port->icount.buf_overrun; 3287027d7dacSJiri Slaby } 3288027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_insert_char); 3289027d7dacSJiri Slaby 329068af4317SDmitry Safonov #ifdef CONFIG_MAGIC_SYSRQ_SERIAL 329168af4317SDmitry Safonov static const char sysrq_toggle_seq[] = CONFIG_MAGIC_SYSRQ_SERIAL_SEQUENCE; 329268af4317SDmitry Safonov 329368af4317SDmitry Safonov static void uart_sysrq_on(struct work_struct *w) 329468af4317SDmitry Safonov { 3295b18896ffSAndy Shevchenko int sysrq_toggle_seq_len = strlen(sysrq_toggle_seq); 3296b18896ffSAndy Shevchenko 329768af4317SDmitry Safonov sysrq_toggle_support(1); 3298b18896ffSAndy Shevchenko pr_info("SysRq is enabled by magic sequence '%*pE' on serial\n", 3299b18896ffSAndy Shevchenko sysrq_toggle_seq_len, sysrq_toggle_seq); 330068af4317SDmitry Safonov } 330168af4317SDmitry Safonov static DECLARE_WORK(sysrq_enable_work, uart_sysrq_on); 330268af4317SDmitry Safonov 330368af4317SDmitry Safonov /** 330468af4317SDmitry Safonov * uart_try_toggle_sysrq - Enables SysRq from serial line 330568af4317SDmitry Safonov * @port: uart_port structure where char(s) after BREAK met 330668af4317SDmitry Safonov * @ch: new character in the sequence after received BREAK 330768af4317SDmitry Safonov * 330868af4317SDmitry Safonov * Enables magic SysRq when the required sequence is met on port 330968af4317SDmitry Safonov * (see CONFIG_MAGIC_SYSRQ_SERIAL_SEQUENCE). 331068af4317SDmitry Safonov * 331168af4317SDmitry Safonov * Returns false if @ch is out of enabling sequence and should be 331268af4317SDmitry Safonov * handled some other way, true if @ch was consumed. 331368af4317SDmitry Safonov */ 331408d54703SJohan Hovold bool uart_try_toggle_sysrq(struct uart_port *port, unsigned int ch) 331568af4317SDmitry Safonov { 33162ce5eaceSAndy Shevchenko int sysrq_toggle_seq_len = strlen(sysrq_toggle_seq); 33172ce5eaceSAndy Shevchenko 33182ce5eaceSAndy Shevchenko if (!sysrq_toggle_seq_len) 331968af4317SDmitry Safonov return false; 332068af4317SDmitry Safonov 332168af4317SDmitry Safonov BUILD_BUG_ON(ARRAY_SIZE(sysrq_toggle_seq) >= U8_MAX); 332268af4317SDmitry Safonov if (sysrq_toggle_seq[port->sysrq_seq] != ch) { 332368af4317SDmitry Safonov port->sysrq_seq = 0; 332468af4317SDmitry Safonov return false; 332568af4317SDmitry Safonov } 332668af4317SDmitry Safonov 33272ce5eaceSAndy Shevchenko if (++port->sysrq_seq < sysrq_toggle_seq_len) { 332868af4317SDmitry Safonov port->sysrq = jiffies + SYSRQ_TIMEOUT; 332968af4317SDmitry Safonov return true; 333068af4317SDmitry Safonov } 333168af4317SDmitry Safonov 333268af4317SDmitry Safonov schedule_work(&sysrq_enable_work); 333368af4317SDmitry Safonov 333468af4317SDmitry Safonov port->sysrq = 0; 333568af4317SDmitry Safonov return true; 333668af4317SDmitry Safonov } 333708d54703SJohan Hovold EXPORT_SYMBOL_GPL(uart_try_toggle_sysrq); 333868af4317SDmitry Safonov #endif 333968af4317SDmitry Safonov 3340ef838a81SUwe Kleine-König /** 3341743f93f8SLukas Wunner * uart_get_rs485_mode() - retrieve rs485 properties for given uart 3342a7172561SRandy Dunlap * @port: uart device's target port 3343ef838a81SUwe Kleine-König * 3344ef838a81SUwe Kleine-König * This function implements the device tree binding described in 3345ef838a81SUwe Kleine-König * Documentation/devicetree/bindings/serial/rs485.txt. 3346ef838a81SUwe Kleine-König */ 3347c150c0f3SLukas Wunner int uart_get_rs485_mode(struct uart_port *port) 3348ef838a81SUwe Kleine-König { 3349c150c0f3SLukas Wunner struct serial_rs485 *rs485conf = &port->rs485; 3350c150c0f3SLukas Wunner struct device *dev = port->dev; 3351ef838a81SUwe Kleine-König u32 rs485_delay[2]; 3352ef838a81SUwe Kleine-König int ret; 3353ef838a81SUwe Kleine-König 3354743f93f8SLukas Wunner ret = device_property_read_u32_array(dev, "rs485-rts-delay", 3355743f93f8SLukas Wunner rs485_delay, 2); 3356ef838a81SUwe Kleine-König if (!ret) { 3357ef838a81SUwe Kleine-König rs485conf->delay_rts_before_send = rs485_delay[0]; 3358ef838a81SUwe Kleine-König rs485conf->delay_rts_after_send = rs485_delay[1]; 3359ef838a81SUwe Kleine-König } else { 3360ef838a81SUwe Kleine-König rs485conf->delay_rts_before_send = 0; 3361ef838a81SUwe Kleine-König rs485conf->delay_rts_after_send = 0; 3362ef838a81SUwe Kleine-König } 3363ef838a81SUwe Kleine-König 3364ef838a81SUwe Kleine-König /* 3365f1e5b618SLukas Wunner * Clear full-duplex and enabled flags, set RTS polarity to active high 3366f1e5b618SLukas Wunner * to get to a defined state with the following properties: 3367ef838a81SUwe Kleine-König */ 3368f1e5b618SLukas Wunner rs485conf->flags &= ~(SER_RS485_RX_DURING_TX | SER_RS485_ENABLED | 3369d58a2df3SLukas Wunner SER_RS485_TERMINATE_BUS | 3370f1e5b618SLukas Wunner SER_RS485_RTS_AFTER_SEND); 3371f1e5b618SLukas Wunner rs485conf->flags |= SER_RS485_RTS_ON_SEND; 3372ef838a81SUwe Kleine-König 3373743f93f8SLukas Wunner if (device_property_read_bool(dev, "rs485-rx-during-tx")) 3374ef838a81SUwe Kleine-König rs485conf->flags |= SER_RS485_RX_DURING_TX; 3375ef838a81SUwe Kleine-König 3376743f93f8SLukas Wunner if (device_property_read_bool(dev, "linux,rs485-enabled-at-boot-time")) 3377ef838a81SUwe Kleine-König rs485conf->flags |= SER_RS485_ENABLED; 3378f1e5b618SLukas Wunner 3379f1e5b618SLukas Wunner if (device_property_read_bool(dev, "rs485-rts-active-low")) { 3380f1e5b618SLukas Wunner rs485conf->flags &= ~SER_RS485_RTS_ON_SEND; 3381f1e5b618SLukas Wunner rs485conf->flags |= SER_RS485_RTS_AFTER_SEND; 3382f1e5b618SLukas Wunner } 3383c150c0f3SLukas Wunner 3384d58a2df3SLukas Wunner /* 3385d58a2df3SLukas Wunner * Disabling termination by default is the safe choice: Else if many 3386d58a2df3SLukas Wunner * bus participants enable it, no communication is possible at all. 3387d58a2df3SLukas Wunner * Works fine for short cables and users may enable for longer cables. 3388d58a2df3SLukas Wunner */ 3389d58a2df3SLukas Wunner port->rs485_term_gpio = devm_gpiod_get_optional(dev, "rs485-term", 3390d58a2df3SLukas Wunner GPIOD_OUT_LOW); 3391d58a2df3SLukas Wunner if (IS_ERR(port->rs485_term_gpio)) { 3392d58a2df3SLukas Wunner ret = PTR_ERR(port->rs485_term_gpio); 3393d58a2df3SLukas Wunner port->rs485_term_gpio = NULL; 339489c65d66SKrzysztof Kozlowski return dev_err_probe(dev, ret, "Cannot get rs485-term-gpios\n"); 3395d58a2df3SLukas Wunner } 3396d58a2df3SLukas Wunner 3397c150c0f3SLukas Wunner return 0; 3398ef838a81SUwe Kleine-König } 3399743f93f8SLukas Wunner EXPORT_SYMBOL_GPL(uart_get_rs485_mode); 3400ef838a81SUwe Kleine-König 3401ab4382d2SGreg Kroah-Hartman MODULE_DESCRIPTION("Serial driver core"); 3402ab4382d2SGreg Kroah-Hartman MODULE_LICENSE("GPL"); 3403