Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/drivers/char/core.c |
| 3 | * |
| 4 | * Driver core for serial ports |
| 5 | * |
| 6 | * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. |
| 7 | * |
| 8 | * Copyright 1999 ARM Limited |
| 9 | * Copyright (C) 2000-2001 Deep Blue Solutions Ltd. |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or modify |
| 12 | * it under the terms of the GNU General Public License as published by |
| 13 | * the Free Software Foundation; either version 2 of the License, or |
| 14 | * (at your option) any later version. |
| 15 | * |
| 16 | * This program is distributed in the hope that it will be useful, |
| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 19 | * GNU General Public License for more details. |
| 20 | * |
| 21 | * You should have received a copy of the GNU General Public License |
| 22 | * along with this program; if not, write to the Free Software |
| 23 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 24 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <linux/module.h> |
| 26 | #include <linux/tty.h> |
| 27 | #include <linux/slab.h> |
| 28 | #include <linux/init.h> |
| 29 | #include <linux/console.h> |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 30 | #include <linux/proc_fs.h> |
| 31 | #include <linux/seq_file.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #include <linux/device.h> |
| 33 | #include <linux/serial.h> /* for serial_state and serial_icounter_struct */ |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 34 | #include <linux/serial_core.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include <linux/delay.h> |
Arjan van de Ven | f392ecf | 2006-01-12 18:44:32 +0000 | [diff] [blame] | 36 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | |
| 38 | #include <asm/irq.h> |
| 39 | #include <asm/uaccess.h> |
| 40 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | /* |
| 42 | * This is used to lock changes in serial line configuration. |
| 43 | */ |
Arjan van de Ven | f392ecf | 2006-01-12 18:44:32 +0000 | [diff] [blame] | 44 | static DEFINE_MUTEX(port_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | |
Ingo Molnar | 13e8359 | 2006-07-03 00:25:03 -0700 | [diff] [blame] | 46 | /* |
| 47 | * lockdep: port->lock is initialized in two places, but we |
| 48 | * want only one lock-class: |
| 49 | */ |
| 50 | static struct lock_class_key port_lock_key; |
| 51 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | #define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8) |
| 53 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | #ifdef CONFIG_SERIAL_CORE_CONSOLE |
| 55 | #define uart_console(port) ((port)->cons && (port)->cons->index == (port)->line) |
| 56 | #else |
| 57 | #define uart_console(port) (0) |
| 58 | #endif |
| 59 | |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 60 | static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 61 | struct ktermios *old_termios); |
Arnd Bergmann | 2036521 | 2010-06-01 22:53:07 +0200 | [diff] [blame] | 62 | static void __uart_wait_until_sent(struct uart_port *port, int timeout); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | static void uart_change_pm(struct uart_state *state, int pm_state); |
| 64 | |
| 65 | /* |
| 66 | * This routine is used by the interrupt handler to schedule processing in |
| 67 | * the software interrupt portion of the driver. |
| 68 | */ |
| 69 | void uart_write_wakeup(struct uart_port *port) |
| 70 | { |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 71 | struct uart_state *state = port->state; |
Pavel Machek | d5f735e | 2006-03-07 21:55:20 -0800 | [diff] [blame] | 72 | /* |
| 73 | * This means you called this function _after_ the port was |
| 74 | * closed. No cookie for you. |
| 75 | */ |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 76 | BUG_ON(!state); |
| 77 | tasklet_schedule(&state->tlet); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | } |
| 79 | |
| 80 | static void uart_stop(struct tty_struct *tty) |
| 81 | { |
| 82 | struct uart_state *state = tty->driver_data; |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 83 | struct uart_port *port = state->uart_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | unsigned long flags; |
| 85 | |
| 86 | spin_lock_irqsave(&port->lock, flags); |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 87 | port->ops->stop_tx(port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | spin_unlock_irqrestore(&port->lock, flags); |
| 89 | } |
| 90 | |
| 91 | static void __uart_start(struct tty_struct *tty) |
| 92 | { |
| 93 | struct uart_state *state = tty->driver_data; |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 94 | struct uart_port *port = state->uart_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 96 | if (!uart_circ_empty(&state->xmit) && state->xmit.buf && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | !tty->stopped && !tty->hw_stopped) |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 98 | port->ops->start_tx(port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | } |
| 100 | |
| 101 | static void uart_start(struct tty_struct *tty) |
| 102 | { |
| 103 | struct uart_state *state = tty->driver_data; |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 104 | struct uart_port *port = state->uart_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | unsigned long flags; |
| 106 | |
| 107 | spin_lock_irqsave(&port->lock, flags); |
| 108 | __uart_start(tty); |
| 109 | spin_unlock_irqrestore(&port->lock, flags); |
| 110 | } |
| 111 | |
| 112 | static void uart_tasklet_action(unsigned long data) |
| 113 | { |
| 114 | struct uart_state *state = (struct uart_state *)data; |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 115 | tty_wakeup(state->port.tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | } |
| 117 | |
| 118 | static inline void |
| 119 | uart_update_mctrl(struct uart_port *port, unsigned int set, unsigned int clear) |
| 120 | { |
| 121 | unsigned long flags; |
| 122 | unsigned int old; |
| 123 | |
| 124 | spin_lock_irqsave(&port->lock, flags); |
| 125 | old = port->mctrl; |
| 126 | port->mctrl = (old & ~clear) | set; |
| 127 | if (old != port->mctrl) |
| 128 | port->ops->set_mctrl(port, port->mctrl); |
| 129 | spin_unlock_irqrestore(&port->lock, flags); |
| 130 | } |
| 131 | |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 132 | #define uart_set_mctrl(port, set) uart_update_mctrl(port, set, 0) |
| 133 | #define uart_clear_mctrl(port, clear) uart_update_mctrl(port, 0, clear) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | |
| 135 | /* |
| 136 | * Startup the port. This will be called once per open. All calls |
Alan Cox | df4f4dd | 2008-07-16 21:53:50 +0100 | [diff] [blame] | 137 | * will be serialised by the per-port mutex. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | */ |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 139 | static int uart_startup(struct tty_struct *tty, struct uart_state *state, int init_hw) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | { |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 141 | struct uart_port *uport = state->uart_port; |
| 142 | struct tty_port *port = &state->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | unsigned long page; |
| 144 | int retval = 0; |
| 145 | |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 146 | if (port->flags & ASYNC_INITIALIZED) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | return 0; |
| 148 | |
| 149 | /* |
| 150 | * Set the TTY IO error marker - we will only clear this |
| 151 | * once we have successfully opened the port. Also set |
| 152 | * up the tty->alt_speed kludge |
| 153 | */ |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 154 | set_bit(TTY_IO_ERROR, &tty->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 156 | if (uport->type == PORT_UNKNOWN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | return 0; |
| 158 | |
| 159 | /* |
| 160 | * Initialise and allocate the transmit and temporary |
| 161 | * buffer. |
| 162 | */ |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 163 | if (!state->xmit.buf) { |
Alan Cox | df4f4dd | 2008-07-16 21:53:50 +0100 | [diff] [blame] | 164 | /* This is protected by the per port mutex */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | page = get_zeroed_page(GFP_KERNEL); |
| 166 | if (!page) |
| 167 | return -ENOMEM; |
| 168 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 169 | state->xmit.buf = (unsigned char *) page; |
| 170 | uart_circ_clear(&state->xmit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | } |
| 172 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 173 | retval = uport->ops->startup(uport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | if (retval == 0) { |
| 175 | if (init_hw) { |
| 176 | /* |
| 177 | * Initialise the hardware port settings. |
| 178 | */ |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 179 | uart_change_speed(tty, state, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | |
| 181 | /* |
| 182 | * Setup the RTS and DTR signals once the |
| 183 | * port is open and ready to respond. |
| 184 | */ |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 185 | if (tty->termios->c_cflag & CBAUD) |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 186 | uart_set_mctrl(uport, TIOCM_RTS | TIOCM_DTR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | } |
| 188 | |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 189 | if (port->flags & ASYNC_CTS_FLOW) { |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 190 | spin_lock_irq(&uport->lock); |
| 191 | if (!(uport->ops->get_mctrl(uport) & TIOCM_CTS)) |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 192 | tty->hw_stopped = 1; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 193 | spin_unlock_irq(&uport->lock); |
Russell King | 0dd7a1a | 2005-06-29 18:40:53 +0100 | [diff] [blame] | 194 | } |
| 195 | |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 196 | set_bit(ASYNCB_INITIALIZED, &port->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 198 | clear_bit(TTY_IO_ERROR, &tty->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | } |
| 200 | |
| 201 | if (retval && capable(CAP_SYS_ADMIN)) |
| 202 | retval = 0; |
| 203 | |
| 204 | return retval; |
| 205 | } |
| 206 | |
| 207 | /* |
| 208 | * This routine will shutdown a serial port; interrupts are disabled, and |
| 209 | * DTR is dropped if the hangup on close termio flag is on. Calls to |
| 210 | * uart_shutdown are serialised by the per-port semaphore. |
| 211 | */ |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 212 | static void uart_shutdown(struct tty_struct *tty, struct uart_state *state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | { |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 214 | struct uart_port *uport = state->uart_port; |
Alan Cox | bdc04e3 | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 215 | struct tty_port *port = &state->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | |
Russell King | ee31b33 | 2005-11-13 15:28:51 +0000 | [diff] [blame] | 217 | /* |
| 218 | * Set the TTY IO error marker |
| 219 | */ |
Alan Cox | f751928 | 2009-01-02 13:49:21 +0000 | [diff] [blame] | 220 | if (tty) |
| 221 | set_bit(TTY_IO_ERROR, &tty->flags); |
Russell King | ee31b33 | 2005-11-13 15:28:51 +0000 | [diff] [blame] | 222 | |
Alan Cox | bdc04e3 | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 223 | if (test_and_clear_bit(ASYNCB_INITIALIZED, &port->flags)) { |
Russell King | ee31b33 | 2005-11-13 15:28:51 +0000 | [diff] [blame] | 224 | /* |
| 225 | * Turn off DTR and RTS early. |
| 226 | */ |
Alan Cox | f751928 | 2009-01-02 13:49:21 +0000 | [diff] [blame] | 227 | if (!tty || (tty->termios->c_cflag & HUPCL)) |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 228 | uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); |
Russell King | ee31b33 | 2005-11-13 15:28:51 +0000 | [diff] [blame] | 229 | |
| 230 | /* |
| 231 | * clear delta_msr_wait queue to avoid mem leaks: we may free |
| 232 | * the irq here so the queue might never be woken up. Note |
| 233 | * that we won't end up waiting on delta_msr_wait again since |
| 234 | * any outstanding file descriptors should be pointing at |
| 235 | * hung_up_tty_fops now. |
| 236 | */ |
Alan Cox | bdc04e3 | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 237 | wake_up_interruptible(&port->delta_msr_wait); |
Russell King | ee31b33 | 2005-11-13 15:28:51 +0000 | [diff] [blame] | 238 | |
| 239 | /* |
| 240 | * Free the IRQ and disable the port. |
| 241 | */ |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 242 | uport->ops->shutdown(uport); |
Russell King | ee31b33 | 2005-11-13 15:28:51 +0000 | [diff] [blame] | 243 | |
| 244 | /* |
| 245 | * Ensure that the IRQ handler isn't running on another CPU. |
| 246 | */ |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 247 | synchronize_irq(uport->irq); |
Russell King | ee31b33 | 2005-11-13 15:28:51 +0000 | [diff] [blame] | 248 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | |
| 250 | /* |
Russell King | ee31b33 | 2005-11-13 15:28:51 +0000 | [diff] [blame] | 251 | * kill off our tasklet |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | */ |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 253 | tasklet_kill(&state->tlet); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | |
| 255 | /* |
| 256 | * Free the transmit buffer page. |
| 257 | */ |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 258 | if (state->xmit.buf) { |
| 259 | free_page((unsigned long)state->xmit.buf); |
| 260 | state->xmit.buf = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | } |
| 263 | |
| 264 | /** |
| 265 | * uart_update_timeout - update per-port FIFO timeout. |
| 266 | * @port: uart_port structure describing the port |
| 267 | * @cflag: termios cflag value |
| 268 | * @baud: speed of the port |
| 269 | * |
| 270 | * Set the port FIFO timeout value. The @cflag value should |
| 271 | * reflect the actual hardware settings. |
| 272 | */ |
| 273 | void |
| 274 | uart_update_timeout(struct uart_port *port, unsigned int cflag, |
| 275 | unsigned int baud) |
| 276 | { |
| 277 | unsigned int bits; |
| 278 | |
| 279 | /* byte size and parity */ |
| 280 | switch (cflag & CSIZE) { |
| 281 | case CS5: |
| 282 | bits = 7; |
| 283 | break; |
| 284 | case CS6: |
| 285 | bits = 8; |
| 286 | break; |
| 287 | case CS7: |
| 288 | bits = 9; |
| 289 | break; |
| 290 | default: |
| 291 | bits = 10; |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 292 | break; /* CS8 */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | } |
| 294 | |
| 295 | if (cflag & CSTOPB) |
| 296 | bits++; |
| 297 | if (cflag & PARENB) |
| 298 | bits++; |
| 299 | |
| 300 | /* |
| 301 | * The total number of bits to be transmitted in the fifo. |
| 302 | */ |
| 303 | bits = bits * port->fifosize; |
| 304 | |
| 305 | /* |
| 306 | * Figure the timeout to send the above number of bits. |
| 307 | * Add .02 seconds of slop |
| 308 | */ |
| 309 | port->timeout = (HZ * bits) / baud + HZ/50; |
| 310 | } |
| 311 | |
| 312 | EXPORT_SYMBOL(uart_update_timeout); |
| 313 | |
| 314 | /** |
| 315 | * uart_get_baud_rate - return baud rate for a particular port |
| 316 | * @port: uart_port structure describing the port in question. |
| 317 | * @termios: desired termios settings. |
| 318 | * @old: old termios (or NULL) |
| 319 | * @min: minimum acceptable baud rate |
| 320 | * @max: maximum acceptable baud rate |
| 321 | * |
| 322 | * Decode the termios structure into a numeric baud rate, |
| 323 | * taking account of the magic 38400 baud rate (with spd_* |
| 324 | * flags), and mapping the %B0 rate to 9600 baud. |
| 325 | * |
| 326 | * If the new baud rate is invalid, try the old termios setting. |
| 327 | * If it's still invalid, we try 9600 baud. |
| 328 | * |
| 329 | * Update the @termios structure to reflect the baud rate |
Alan Cox | eb424fd | 2008-04-28 02:14:07 -0700 | [diff] [blame] | 330 | * we're actually going to be using. Don't do this for the case |
| 331 | * where B0 is requested ("hang up"). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | */ |
| 333 | unsigned int |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 334 | uart_get_baud_rate(struct uart_port *port, struct ktermios *termios, |
| 335 | struct ktermios *old, unsigned int min, unsigned int max) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | { |
| 337 | unsigned int try, baud, altbaud = 38400; |
Alan Cox | eb424fd | 2008-04-28 02:14:07 -0700 | [diff] [blame] | 338 | int hung_up = 0; |
Russell King | 0077d45 | 2006-01-21 23:03:28 +0000 | [diff] [blame] | 339 | upf_t flags = port->flags & UPF_SPD_MASK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | |
| 341 | if (flags == UPF_SPD_HI) |
| 342 | altbaud = 57600; |
André Goddard Rosa | 82cb7ba | 2009-10-25 11:18:26 -0200 | [diff] [blame] | 343 | else if (flags == UPF_SPD_VHI) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | altbaud = 115200; |
André Goddard Rosa | 82cb7ba | 2009-10-25 11:18:26 -0200 | [diff] [blame] | 345 | else if (flags == UPF_SPD_SHI) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | altbaud = 230400; |
André Goddard Rosa | 82cb7ba | 2009-10-25 11:18:26 -0200 | [diff] [blame] | 347 | else if (flags == UPF_SPD_WARP) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | altbaud = 460800; |
| 349 | |
| 350 | for (try = 0; try < 2; try++) { |
| 351 | baud = tty_termios_baud_rate(termios); |
| 352 | |
| 353 | /* |
| 354 | * The spd_hi, spd_vhi, spd_shi, spd_warp kludge... |
| 355 | * Die! Die! Die! |
| 356 | */ |
| 357 | if (baud == 38400) |
| 358 | baud = altbaud; |
| 359 | |
| 360 | /* |
| 361 | * Special case: B0 rate. |
| 362 | */ |
Alan Cox | eb424fd | 2008-04-28 02:14:07 -0700 | [diff] [blame] | 363 | if (baud == 0) { |
| 364 | hung_up = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | baud = 9600; |
Alan Cox | eb424fd | 2008-04-28 02:14:07 -0700 | [diff] [blame] | 366 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | |
| 368 | if (baud >= min && baud <= max) |
| 369 | return baud; |
| 370 | |
| 371 | /* |
| 372 | * Oops, the quotient was zero. Try again with |
| 373 | * the old baud rate if possible. |
| 374 | */ |
| 375 | termios->c_cflag &= ~CBAUD; |
| 376 | if (old) { |
Alan Cox | 6d4d67b | 2008-02-04 22:27:53 -0800 | [diff] [blame] | 377 | baud = tty_termios_baud_rate(old); |
Alan Cox | eb424fd | 2008-04-28 02:14:07 -0700 | [diff] [blame] | 378 | if (!hung_up) |
| 379 | tty_termios_encode_baud_rate(termios, |
| 380 | baud, baud); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | old = NULL; |
| 382 | continue; |
| 383 | } |
| 384 | |
| 385 | /* |
Alan Cox | 16ae2a8 | 2010-01-04 16:26:21 +0000 | [diff] [blame] | 386 | * As a last resort, if the range cannot be met then clip to |
| 387 | * the nearest chip supported rate. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | */ |
Alan Cox | 16ae2a8 | 2010-01-04 16:26:21 +0000 | [diff] [blame] | 389 | if (!hung_up) { |
| 390 | if (baud <= min) |
| 391 | tty_termios_encode_baud_rate(termios, |
| 392 | min + 1, min + 1); |
| 393 | else |
| 394 | tty_termios_encode_baud_rate(termios, |
| 395 | max - 1, max - 1); |
| 396 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | } |
Alan Cox | 16ae2a8 | 2010-01-04 16:26:21 +0000 | [diff] [blame] | 398 | /* Should never happen */ |
| 399 | WARN_ON(1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | return 0; |
| 401 | } |
| 402 | |
| 403 | EXPORT_SYMBOL(uart_get_baud_rate); |
| 404 | |
| 405 | /** |
| 406 | * uart_get_divisor - return uart clock divisor |
| 407 | * @port: uart_port structure describing the port. |
| 408 | * @baud: desired baud rate |
| 409 | * |
| 410 | * Calculate the uart clock divisor for the port. |
| 411 | */ |
| 412 | unsigned int |
| 413 | uart_get_divisor(struct uart_port *port, unsigned int baud) |
| 414 | { |
| 415 | unsigned int quot; |
| 416 | |
| 417 | /* |
| 418 | * Old custom speed handling. |
| 419 | */ |
| 420 | if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) |
| 421 | quot = port->custom_divisor; |
| 422 | else |
| 423 | quot = (port->uartclk + (8 * baud)) / (16 * baud); |
| 424 | |
| 425 | return quot; |
| 426 | } |
| 427 | |
| 428 | EXPORT_SYMBOL(uart_get_divisor); |
| 429 | |
Alan Cox | 23d22ce | 2008-04-30 00:54:11 -0700 | [diff] [blame] | 430 | /* FIXME: Consistent locking policy */ |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 431 | static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, |
| 432 | struct ktermios *old_termios) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | { |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 434 | struct tty_port *port = &state->port; |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 435 | struct uart_port *uport = state->uart_port; |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 436 | struct ktermios *termios; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | |
| 438 | /* |
| 439 | * If we have no tty, termios, or the port does not exist, |
| 440 | * then we can't set the parameters for this port. |
| 441 | */ |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 442 | if (!tty || !tty->termios || uport->type == PORT_UNKNOWN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | return; |
| 444 | |
| 445 | termios = tty->termios; |
| 446 | |
| 447 | /* |
| 448 | * Set flags based on termios cflag |
| 449 | */ |
| 450 | if (termios->c_cflag & CRTSCTS) |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 451 | set_bit(ASYNCB_CTS_FLOW, &port->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | else |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 453 | clear_bit(ASYNCB_CTS_FLOW, &port->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | |
| 455 | if (termios->c_cflag & CLOCAL) |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 456 | clear_bit(ASYNCB_CHECK_CD, &port->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | else |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 458 | set_bit(ASYNCB_CHECK_CD, &port->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 460 | uport->ops->set_termios(uport, termios, old_termios); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | } |
| 462 | |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 463 | static inline int __uart_put_char(struct uart_port *port, |
| 464 | struct circ_buf *circ, unsigned char c) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | { |
| 466 | unsigned long flags; |
Alan Cox | 23d22ce | 2008-04-30 00:54:11 -0700 | [diff] [blame] | 467 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | |
| 469 | if (!circ->buf) |
Alan Cox | 23d22ce | 2008-04-30 00:54:11 -0700 | [diff] [blame] | 470 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | |
| 472 | spin_lock_irqsave(&port->lock, flags); |
| 473 | if (uart_circ_chars_free(circ) != 0) { |
| 474 | circ->buf[circ->head] = c; |
| 475 | circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1); |
Alan Cox | 23d22ce | 2008-04-30 00:54:11 -0700 | [diff] [blame] | 476 | ret = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | } |
| 478 | spin_unlock_irqrestore(&port->lock, flags); |
Alan Cox | 23d22ce | 2008-04-30 00:54:11 -0700 | [diff] [blame] | 479 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | } |
| 481 | |
Alan Cox | 23d22ce | 2008-04-30 00:54:11 -0700 | [diff] [blame] | 482 | static int uart_put_char(struct tty_struct *tty, unsigned char ch) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | { |
| 484 | struct uart_state *state = tty->driver_data; |
| 485 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 486 | return __uart_put_char(state->uart_port, &state->xmit, ch); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | } |
| 488 | |
| 489 | static void uart_flush_chars(struct tty_struct *tty) |
| 490 | { |
| 491 | uart_start(tty); |
| 492 | } |
| 493 | |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 494 | static int uart_write(struct tty_struct *tty, |
| 495 | const unsigned char *buf, int count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | { |
| 497 | struct uart_state *state = tty->driver_data; |
Pavel Machek | d5f735e | 2006-03-07 21:55:20 -0800 | [diff] [blame] | 498 | struct uart_port *port; |
| 499 | struct circ_buf *circ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | unsigned long flags; |
| 501 | int c, ret = 0; |
| 502 | |
Pavel Machek | d5f735e | 2006-03-07 21:55:20 -0800 | [diff] [blame] | 503 | /* |
| 504 | * This means you called this function _after_ the port was |
| 505 | * closed. No cookie for you. |
| 506 | */ |
Alan Cox | f751928 | 2009-01-02 13:49:21 +0000 | [diff] [blame] | 507 | if (!state) { |
Pavel Machek | d5f735e | 2006-03-07 21:55:20 -0800 | [diff] [blame] | 508 | WARN_ON(1); |
| 509 | return -EL3HLT; |
| 510 | } |
| 511 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 512 | port = state->uart_port; |
| 513 | circ = &state->xmit; |
Pavel Machek | d5f735e | 2006-03-07 21:55:20 -0800 | [diff] [blame] | 514 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | if (!circ->buf) |
| 516 | return 0; |
| 517 | |
| 518 | spin_lock_irqsave(&port->lock, flags); |
| 519 | while (1) { |
| 520 | c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE); |
| 521 | if (count < c) |
| 522 | c = count; |
| 523 | if (c <= 0) |
| 524 | break; |
| 525 | memcpy(circ->buf + circ->head, buf, c); |
| 526 | circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1); |
| 527 | buf += c; |
| 528 | count -= c; |
| 529 | ret += c; |
| 530 | } |
| 531 | spin_unlock_irqrestore(&port->lock, flags); |
| 532 | |
| 533 | uart_start(tty); |
| 534 | return ret; |
| 535 | } |
| 536 | |
| 537 | static int uart_write_room(struct tty_struct *tty) |
| 538 | { |
| 539 | struct uart_state *state = tty->driver_data; |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 540 | unsigned long flags; |
| 541 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 543 | spin_lock_irqsave(&state->uart_port->lock, flags); |
| 544 | ret = uart_circ_chars_free(&state->xmit); |
| 545 | spin_unlock_irqrestore(&state->uart_port->lock, flags); |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 546 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | } |
| 548 | |
| 549 | static int uart_chars_in_buffer(struct tty_struct *tty) |
| 550 | { |
| 551 | struct uart_state *state = tty->driver_data; |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 552 | unsigned long flags; |
| 553 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 555 | spin_lock_irqsave(&state->uart_port->lock, flags); |
| 556 | ret = uart_circ_chars_pending(&state->xmit); |
| 557 | spin_unlock_irqrestore(&state->uart_port->lock, flags); |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 558 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | } |
| 560 | |
| 561 | static void uart_flush_buffer(struct tty_struct *tty) |
| 562 | { |
| 563 | struct uart_state *state = tty->driver_data; |
Tetsuo Handa | 55d7b68 | 2008-05-06 20:42:27 -0700 | [diff] [blame] | 564 | struct uart_port *port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | unsigned long flags; |
| 566 | |
Pavel Machek | d5f735e | 2006-03-07 21:55:20 -0800 | [diff] [blame] | 567 | /* |
| 568 | * This means you called this function _after_ the port was |
| 569 | * closed. No cookie for you. |
| 570 | */ |
Alan Cox | f751928 | 2009-01-02 13:49:21 +0000 | [diff] [blame] | 571 | if (!state) { |
Pavel Machek | d5f735e | 2006-03-07 21:55:20 -0800 | [diff] [blame] | 572 | WARN_ON(1); |
| 573 | return; |
| 574 | } |
| 575 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 576 | port = state->uart_port; |
Jiri Slaby | eb3a1e1 | 2007-05-06 14:48:52 -0700 | [diff] [blame] | 577 | pr_debug("uart_flush_buffer(%d) called\n", tty->index); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | |
| 579 | spin_lock_irqsave(&port->lock, flags); |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 580 | uart_circ_clear(&state->xmit); |
Haavard Skinnemoen | 6bb0e3a | 2008-07-16 21:52:36 +0100 | [diff] [blame] | 581 | if (port->ops->flush_buffer) |
| 582 | port->ops->flush_buffer(port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | spin_unlock_irqrestore(&port->lock, flags); |
| 584 | tty_wakeup(tty); |
| 585 | } |
| 586 | |
| 587 | /* |
| 588 | * This function is used to send a high-priority XON/XOFF character to |
| 589 | * the device |
| 590 | */ |
| 591 | static void uart_send_xchar(struct tty_struct *tty, char ch) |
| 592 | { |
| 593 | struct uart_state *state = tty->driver_data; |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 594 | struct uart_port *port = state->uart_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | unsigned long flags; |
| 596 | |
| 597 | if (port->ops->send_xchar) |
| 598 | port->ops->send_xchar(port, ch); |
| 599 | else { |
| 600 | port->x_char = ch; |
| 601 | if (ch) { |
| 602 | spin_lock_irqsave(&port->lock, flags); |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 603 | port->ops->start_tx(port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | spin_unlock_irqrestore(&port->lock, flags); |
| 605 | } |
| 606 | } |
| 607 | } |
| 608 | |
| 609 | static void uart_throttle(struct tty_struct *tty) |
| 610 | { |
| 611 | struct uart_state *state = tty->driver_data; |
| 612 | |
| 613 | if (I_IXOFF(tty)) |
| 614 | uart_send_xchar(tty, STOP_CHAR(tty)); |
| 615 | |
| 616 | if (tty->termios->c_cflag & CRTSCTS) |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 617 | uart_clear_mctrl(state->uart_port, TIOCM_RTS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | } |
| 619 | |
| 620 | static void uart_unthrottle(struct tty_struct *tty) |
| 621 | { |
| 622 | struct uart_state *state = tty->driver_data; |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 623 | struct uart_port *port = state->uart_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | |
| 625 | if (I_IXOFF(tty)) { |
| 626 | if (port->x_char) |
| 627 | port->x_char = 0; |
| 628 | else |
| 629 | uart_send_xchar(tty, START_CHAR(tty)); |
| 630 | } |
| 631 | |
| 632 | if (tty->termios->c_cflag & CRTSCTS) |
| 633 | uart_set_mctrl(port, TIOCM_RTS); |
| 634 | } |
| 635 | |
| 636 | static int uart_get_info(struct uart_state *state, |
| 637 | struct serial_struct __user *retinfo) |
| 638 | { |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 639 | struct uart_port *uport = state->uart_port; |
| 640 | struct tty_port *port = &state->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | struct serial_struct tmp; |
| 642 | |
| 643 | memset(&tmp, 0, sizeof(tmp)); |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 644 | |
| 645 | /* Ensure the state we copy is consistent and no hardware changes |
| 646 | occur as we go */ |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 647 | mutex_lock(&port->mutex); |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 648 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 649 | tmp.type = uport->type; |
| 650 | tmp.line = uport->line; |
| 651 | tmp.port = uport->iobase; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | if (HIGH_BITS_OFFSET) |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 653 | tmp.port_high = (long) uport->iobase >> HIGH_BITS_OFFSET; |
| 654 | tmp.irq = uport->irq; |
| 655 | tmp.flags = uport->flags; |
| 656 | tmp.xmit_fifo_size = uport->fifosize; |
| 657 | tmp.baud_base = uport->uartclk / 16; |
| 658 | tmp.close_delay = port->close_delay / 10; |
Alan Cox | 016af53 | 2009-09-19 13:13:32 -0700 | [diff] [blame] | 659 | tmp.closing_wait = port->closing_wait == ASYNC_CLOSING_WAIT_NONE ? |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | ASYNC_CLOSING_WAIT_NONE : |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 661 | port->closing_wait / 10; |
| 662 | tmp.custom_divisor = uport->custom_divisor; |
| 663 | tmp.hub6 = uport->hub6; |
| 664 | tmp.io_type = uport->iotype; |
| 665 | tmp.iomem_reg_shift = uport->regshift; |
| 666 | tmp.iomem_base = (void *)(unsigned long)uport->mapbase; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 668 | mutex_unlock(&port->mutex); |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 669 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) |
| 671 | return -EFAULT; |
| 672 | return 0; |
| 673 | } |
| 674 | |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 675 | static int uart_set_info(struct tty_struct *tty, struct uart_state *state, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | struct serial_struct __user *newinfo) |
| 677 | { |
| 678 | struct serial_struct new_serial; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 679 | struct uart_port *uport = state->uart_port; |
| 680 | struct tty_port *port = &state->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | unsigned long new_port; |
Russell King | 0077d45 | 2006-01-21 23:03:28 +0000 | [diff] [blame] | 682 | unsigned int change_irq, change_port, closing_wait; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | unsigned int old_custom_divisor, close_delay; |
Russell King | 0077d45 | 2006-01-21 23:03:28 +0000 | [diff] [blame] | 684 | upf_t old_flags, new_flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | int retval = 0; |
| 686 | |
| 687 | if (copy_from_user(&new_serial, newinfo, sizeof(new_serial))) |
| 688 | return -EFAULT; |
| 689 | |
| 690 | new_port = new_serial.port; |
| 691 | if (HIGH_BITS_OFFSET) |
| 692 | new_port += (unsigned long) new_serial.port_high << HIGH_BITS_OFFSET; |
| 693 | |
| 694 | new_serial.irq = irq_canonicalize(new_serial.irq); |
| 695 | close_delay = new_serial.close_delay * 10; |
| 696 | closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ? |
Alan Cox | 016af53 | 2009-09-19 13:13:32 -0700 | [diff] [blame] | 697 | ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | |
| 699 | /* |
Alan Cox | 91312cd | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 700 | * This semaphore protects port->count. It is also |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | * very useful to prevent opens. Also, take the |
| 702 | * port configuration semaphore to make sure that a |
| 703 | * module insertion/removal doesn't change anything |
| 704 | * under us. |
| 705 | */ |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 706 | mutex_lock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 708 | change_irq = !(uport->flags & UPF_FIXED_PORT) |
| 709 | && new_serial.irq != uport->irq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | |
| 711 | /* |
| 712 | * Since changing the 'type' of the port changes its resource |
| 713 | * allocations, we should treat type changes the same as |
| 714 | * IO port changes. |
| 715 | */ |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 716 | change_port = !(uport->flags & UPF_FIXED_PORT) |
| 717 | && (new_port != uport->iobase || |
| 718 | (unsigned long)new_serial.iomem_base != uport->mapbase || |
| 719 | new_serial.hub6 != uport->hub6 || |
| 720 | new_serial.io_type != uport->iotype || |
| 721 | new_serial.iomem_reg_shift != uport->regshift || |
| 722 | new_serial.type != uport->type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 724 | old_flags = uport->flags; |
Russell King | 0077d45 | 2006-01-21 23:03:28 +0000 | [diff] [blame] | 725 | new_flags = new_serial.flags; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 726 | old_custom_divisor = uport->custom_divisor; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | |
| 728 | if (!capable(CAP_SYS_ADMIN)) { |
| 729 | retval = -EPERM; |
| 730 | if (change_irq || change_port || |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 731 | (new_serial.baud_base != uport->uartclk / 16) || |
| 732 | (close_delay != port->close_delay) || |
| 733 | (closing_wait != port->closing_wait) || |
Russell King | 947deee | 2006-07-02 20:45:51 +0100 | [diff] [blame] | 734 | (new_serial.xmit_fifo_size && |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 735 | new_serial.xmit_fifo_size != uport->fifosize) || |
Russell King | 0077d45 | 2006-01-21 23:03:28 +0000 | [diff] [blame] | 736 | (((new_flags ^ old_flags) & ~UPF_USR_MASK) != 0)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | goto exit; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 738 | uport->flags = ((uport->flags & ~UPF_USR_MASK) | |
Russell King | 0077d45 | 2006-01-21 23:03:28 +0000 | [diff] [blame] | 739 | (new_flags & UPF_USR_MASK)); |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 740 | uport->custom_divisor = new_serial.custom_divisor; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | goto check_and_exit; |
| 742 | } |
| 743 | |
| 744 | /* |
| 745 | * Ask the low level driver to verify the settings. |
| 746 | */ |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 747 | if (uport->ops->verify_port) |
| 748 | retval = uport->ops->verify_port(uport, &new_serial); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | |
Yinghai Lu | a62c413 | 2008-08-19 20:49:55 -0700 | [diff] [blame] | 750 | if ((new_serial.irq >= nr_irqs) || (new_serial.irq < 0) || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | (new_serial.baud_base < 9600)) |
| 752 | retval = -EINVAL; |
| 753 | |
| 754 | if (retval) |
| 755 | goto exit; |
| 756 | |
| 757 | if (change_port || change_irq) { |
| 758 | retval = -EBUSY; |
| 759 | |
| 760 | /* |
| 761 | * Make sure that we are the sole user of this port. |
| 762 | */ |
Alan Cox | b58d13a | 2009-09-19 13:13:32 -0700 | [diff] [blame] | 763 | if (tty_port_users(port) > 1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | goto exit; |
| 765 | |
| 766 | /* |
| 767 | * We need to shutdown the serial port at the old |
| 768 | * port/type/irq combination. |
| 769 | */ |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 770 | uart_shutdown(tty, state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | } |
| 772 | |
| 773 | if (change_port) { |
| 774 | unsigned long old_iobase, old_mapbase; |
| 775 | unsigned int old_type, old_iotype, old_hub6, old_shift; |
| 776 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 777 | old_iobase = uport->iobase; |
| 778 | old_mapbase = uport->mapbase; |
| 779 | old_type = uport->type; |
| 780 | old_hub6 = uport->hub6; |
| 781 | old_iotype = uport->iotype; |
| 782 | old_shift = uport->regshift; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | |
| 784 | /* |
| 785 | * Free and release old regions |
| 786 | */ |
| 787 | if (old_type != PORT_UNKNOWN) |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 788 | uport->ops->release_port(uport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 790 | uport->iobase = new_port; |
| 791 | uport->type = new_serial.type; |
| 792 | uport->hub6 = new_serial.hub6; |
| 793 | uport->iotype = new_serial.io_type; |
| 794 | uport->regshift = new_serial.iomem_reg_shift; |
| 795 | uport->mapbase = (unsigned long)new_serial.iomem_base; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | |
| 797 | /* |
| 798 | * Claim and map the new regions |
| 799 | */ |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 800 | if (uport->type != PORT_UNKNOWN) { |
| 801 | retval = uport->ops->request_port(uport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | } else { |
| 803 | /* Always success - Jean II */ |
| 804 | retval = 0; |
| 805 | } |
| 806 | |
| 807 | /* |
| 808 | * If we fail to request resources for the |
| 809 | * new port, try to restore the old settings. |
| 810 | */ |
| 811 | if (retval && old_type != PORT_UNKNOWN) { |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 812 | uport->iobase = old_iobase; |
| 813 | uport->type = old_type; |
| 814 | uport->hub6 = old_hub6; |
| 815 | uport->iotype = old_iotype; |
| 816 | uport->regshift = old_shift; |
| 817 | uport->mapbase = old_mapbase; |
| 818 | retval = uport->ops->request_port(uport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | /* |
| 820 | * If we failed to restore the old settings, |
| 821 | * we fail like this. |
| 822 | */ |
| 823 | if (retval) |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 824 | uport->type = PORT_UNKNOWN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | |
| 826 | /* |
| 827 | * We failed anyway. |
| 828 | */ |
| 829 | retval = -EBUSY; |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 830 | /* Added to return the correct error -Ram Gupta */ |
| 831 | goto exit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | } |
| 833 | } |
| 834 | |
David Gibson | abb4a23 | 2007-05-06 14:48:49 -0700 | [diff] [blame] | 835 | if (change_irq) |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 836 | uport->irq = new_serial.irq; |
| 837 | if (!(uport->flags & UPF_FIXED_PORT)) |
| 838 | uport->uartclk = new_serial.baud_base * 16; |
| 839 | uport->flags = (uport->flags & ~UPF_CHANGE_MASK) | |
Russell King | 0077d45 | 2006-01-21 23:03:28 +0000 | [diff] [blame] | 840 | (new_flags & UPF_CHANGE_MASK); |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 841 | uport->custom_divisor = new_serial.custom_divisor; |
| 842 | port->close_delay = close_delay; |
| 843 | port->closing_wait = closing_wait; |
Russell King | 947deee | 2006-07-02 20:45:51 +0100 | [diff] [blame] | 844 | if (new_serial.xmit_fifo_size) |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 845 | uport->fifosize = new_serial.xmit_fifo_size; |
| 846 | if (port->tty) |
| 847 | port->tty->low_latency = |
| 848 | (uport->flags & UPF_LOW_LATENCY) ? 1 : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | |
| 850 | check_and_exit: |
| 851 | retval = 0; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 852 | if (uport->type == PORT_UNKNOWN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | goto exit; |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 854 | if (port->flags & ASYNC_INITIALIZED) { |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 855 | if (((old_flags ^ uport->flags) & UPF_SPD_MASK) || |
| 856 | old_custom_divisor != uport->custom_divisor) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 857 | /* |
| 858 | * If they're setting up a custom divisor or speed, |
| 859 | * instead of clearing it, then bitch about it. No |
| 860 | * need to rate-limit; it's CAP_SYS_ADMIN only. |
| 861 | */ |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 862 | if (uport->flags & UPF_SPD_MASK) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | char buf[64]; |
| 864 | printk(KERN_NOTICE |
| 865 | "%s sets custom speed on %s. This " |
| 866 | "is deprecated.\n", current->comm, |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 867 | tty_name(port->tty, buf)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 868 | } |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 869 | uart_change_speed(tty, state, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 870 | } |
| 871 | } else |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 872 | retval = uart_startup(tty, state, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | exit: |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 874 | mutex_unlock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | return retval; |
| 876 | } |
| 877 | |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 878 | /** |
| 879 | * uart_get_lsr_info - get line status register info |
| 880 | * @tty: tty associated with the UART |
| 881 | * @state: UART being queried |
| 882 | * @value: returned modem value |
| 883 | * |
| 884 | * Note: uart_ioctl protects us against hangups. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | */ |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 886 | static int uart_get_lsr_info(struct tty_struct *tty, |
| 887 | struct uart_state *state, unsigned int __user *value) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | { |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 889 | struct uart_port *uport = state->uart_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 890 | unsigned int result; |
| 891 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 892 | result = uport->ops->tx_empty(uport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 893 | |
| 894 | /* |
| 895 | * If we're about to load something into the transmit |
| 896 | * register, we'll pretend the transmitter isn't empty to |
| 897 | * avoid a race condition (depending on when the transmit |
| 898 | * interrupt happens). |
| 899 | */ |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 900 | if (uport->x_char || |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 901 | ((uart_circ_chars_pending(&state->xmit) > 0) && |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 902 | !tty->stopped && !tty->hw_stopped)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 903 | result &= ~TIOCSER_TEMT; |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 904 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 905 | return put_user(result, value); |
| 906 | } |
| 907 | |
| 908 | static int uart_tiocmget(struct tty_struct *tty, struct file *file) |
| 909 | { |
| 910 | struct uart_state *state = tty->driver_data; |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 911 | struct tty_port *port = &state->port; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 912 | struct uart_port *uport = state->uart_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 913 | int result = -EIO; |
| 914 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 915 | mutex_lock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 916 | if ((!file || !tty_hung_up_p(file)) && |
| 917 | !(tty->flags & (1 << TTY_IO_ERROR))) { |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 918 | result = uport->mctrl; |
Russell King | c5f4644 | 2005-06-29 09:42:38 +0100 | [diff] [blame] | 919 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 920 | spin_lock_irq(&uport->lock); |
| 921 | result |= uport->ops->get_mctrl(uport); |
| 922 | spin_unlock_irq(&uport->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 923 | } |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 924 | mutex_unlock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 925 | |
| 926 | return result; |
| 927 | } |
| 928 | |
| 929 | static int |
| 930 | uart_tiocmset(struct tty_struct *tty, struct file *file, |
| 931 | unsigned int set, unsigned int clear) |
| 932 | { |
| 933 | struct uart_state *state = tty->driver_data; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 934 | struct uart_port *uport = state->uart_port; |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 935 | struct tty_port *port = &state->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 936 | int ret = -EIO; |
| 937 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 938 | mutex_lock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | if ((!file || !tty_hung_up_p(file)) && |
| 940 | !(tty->flags & (1 << TTY_IO_ERROR))) { |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 941 | uart_update_mctrl(uport, set, clear); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | ret = 0; |
| 943 | } |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 944 | mutex_unlock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 945 | return ret; |
| 946 | } |
| 947 | |
Alan Cox | 9e98966 | 2008-07-22 11:18:03 +0100 | [diff] [blame] | 948 | static int uart_break_ctl(struct tty_struct *tty, int break_state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 949 | { |
| 950 | struct uart_state *state = tty->driver_data; |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 951 | struct tty_port *port = &state->port; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 952 | struct uart_port *uport = state->uart_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 953 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 954 | mutex_lock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 955 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 956 | if (uport->type != PORT_UNKNOWN) |
| 957 | uport->ops->break_ctl(uport, break_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 958 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 959 | mutex_unlock(&port->mutex); |
Alan Cox | 9e98966 | 2008-07-22 11:18:03 +0100 | [diff] [blame] | 960 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | } |
| 962 | |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 963 | static int uart_do_autoconfig(struct tty_struct *tty,struct uart_state *state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 964 | { |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 965 | struct uart_port *uport = state->uart_port; |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 966 | struct tty_port *port = &state->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 967 | int flags, ret; |
| 968 | |
| 969 | if (!capable(CAP_SYS_ADMIN)) |
| 970 | return -EPERM; |
| 971 | |
| 972 | /* |
| 973 | * Take the per-port semaphore. This prevents count from |
| 974 | * changing, and hence any extra opens of the port while |
| 975 | * we're auto-configuring. |
| 976 | */ |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 977 | if (mutex_lock_interruptible(&port->mutex)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 978 | return -ERESTARTSYS; |
| 979 | |
| 980 | ret = -EBUSY; |
Alan Cox | b58d13a | 2009-09-19 13:13:32 -0700 | [diff] [blame] | 981 | if (tty_port_users(port) == 1) { |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 982 | uart_shutdown(tty, state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 983 | |
| 984 | /* |
| 985 | * If we already have a port type configured, |
| 986 | * we must release its resources. |
| 987 | */ |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 988 | if (uport->type != PORT_UNKNOWN) |
| 989 | uport->ops->release_port(uport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | |
| 991 | flags = UART_CONFIG_TYPE; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 992 | if (uport->flags & UPF_AUTO_IRQ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 993 | flags |= UART_CONFIG_IRQ; |
| 994 | |
| 995 | /* |
| 996 | * This will claim the ports resources if |
| 997 | * a port is found. |
| 998 | */ |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 999 | uport->ops->config_port(uport, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1000 | |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 1001 | ret = uart_startup(tty, state, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1002 | } |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1003 | mutex_unlock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | return ret; |
| 1005 | } |
| 1006 | |
| 1007 | /* |
| 1008 | * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change |
| 1009 | * - mask passed in arg for lines of interest |
| 1010 | * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) |
| 1011 | * Caller should use TIOCGICOUNT to see which one it was |
Alan Cox | bdc04e3 | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1012 | * |
| 1013 | * FIXME: This wants extracting into a common all driver implementation |
| 1014 | * of TIOCMWAIT using tty_port. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1015 | */ |
| 1016 | static int |
| 1017 | uart_wait_modem_status(struct uart_state *state, unsigned long arg) |
| 1018 | { |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1019 | struct uart_port *uport = state->uart_port; |
Alan Cox | bdc04e3 | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1020 | struct tty_port *port = &state->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1021 | DECLARE_WAITQUEUE(wait, current); |
| 1022 | struct uart_icount cprev, cnow; |
| 1023 | int ret; |
| 1024 | |
| 1025 | /* |
| 1026 | * note the counters on entry |
| 1027 | */ |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1028 | spin_lock_irq(&uport->lock); |
| 1029 | memcpy(&cprev, &uport->icount, sizeof(struct uart_icount)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1030 | |
| 1031 | /* |
| 1032 | * Force modem status interrupts on |
| 1033 | */ |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1034 | uport->ops->enable_ms(uport); |
| 1035 | spin_unlock_irq(&uport->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1036 | |
Alan Cox | bdc04e3 | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1037 | add_wait_queue(&port->delta_msr_wait, &wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1038 | for (;;) { |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1039 | spin_lock_irq(&uport->lock); |
| 1040 | memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); |
| 1041 | spin_unlock_irq(&uport->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1042 | |
| 1043 | set_current_state(TASK_INTERRUPTIBLE); |
| 1044 | |
| 1045 | if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || |
| 1046 | ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || |
| 1047 | ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || |
| 1048 | ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) { |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 1049 | ret = 0; |
| 1050 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1051 | } |
| 1052 | |
| 1053 | schedule(); |
| 1054 | |
| 1055 | /* see if a signal did it */ |
| 1056 | if (signal_pending(current)) { |
| 1057 | ret = -ERESTARTSYS; |
| 1058 | break; |
| 1059 | } |
| 1060 | |
| 1061 | cprev = cnow; |
| 1062 | } |
| 1063 | |
| 1064 | current->state = TASK_RUNNING; |
Alan Cox | bdc04e3 | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1065 | remove_wait_queue(&port->delta_msr_wait, &wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1066 | |
| 1067 | return ret; |
| 1068 | } |
| 1069 | |
| 1070 | /* |
| 1071 | * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) |
| 1072 | * Return: write counters to the user passed counter struct |
| 1073 | * NB: both 1->0 and 0->1 transitions are counted except for |
| 1074 | * RI where only 0->1 is counted. |
| 1075 | */ |
Alan Cox | d281da7 | 2010-09-16 18:21:24 +0100 | [diff] [blame] | 1076 | static int uart_get_icount(struct tty_struct *tty, |
| 1077 | struct serial_icounter_struct *icount) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1078 | { |
Alan Cox | d281da7 | 2010-09-16 18:21:24 +0100 | [diff] [blame] | 1079 | struct uart_state *state = tty->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1080 | struct uart_icount cnow; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1081 | struct uart_port *uport = state->uart_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1082 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1083 | spin_lock_irq(&uport->lock); |
| 1084 | memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); |
| 1085 | spin_unlock_irq(&uport->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1086 | |
Alan Cox | d281da7 | 2010-09-16 18:21:24 +0100 | [diff] [blame] | 1087 | icount->cts = cnow.cts; |
| 1088 | icount->dsr = cnow.dsr; |
| 1089 | icount->rng = cnow.rng; |
| 1090 | icount->dcd = cnow.dcd; |
| 1091 | icount->rx = cnow.rx; |
| 1092 | icount->tx = cnow.tx; |
| 1093 | icount->frame = cnow.frame; |
| 1094 | icount->overrun = cnow.overrun; |
| 1095 | icount->parity = cnow.parity; |
| 1096 | icount->brk = cnow.brk; |
| 1097 | icount->buf_overrun = cnow.buf_overrun; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1098 | |
Alan Cox | d281da7 | 2010-09-16 18:21:24 +0100 | [diff] [blame] | 1099 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1100 | } |
| 1101 | |
| 1102 | /* |
Alan Cox | e523844 | 2008-04-30 00:53:28 -0700 | [diff] [blame] | 1103 | * Called via sys_ioctl. We can use spin_lock_irq() here. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1104 | */ |
| 1105 | static int |
| 1106 | uart_ioctl(struct tty_struct *tty, struct file *filp, unsigned int cmd, |
| 1107 | unsigned long arg) |
| 1108 | { |
| 1109 | struct uart_state *state = tty->driver_data; |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1110 | struct tty_port *port = &state->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1111 | void __user *uarg = (void __user *)arg; |
| 1112 | int ret = -ENOIOCTLCMD; |
| 1113 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1114 | |
| 1115 | /* |
| 1116 | * These ioctls don't rely on the hardware to be present. |
| 1117 | */ |
| 1118 | switch (cmd) { |
| 1119 | case TIOCGSERIAL: |
| 1120 | ret = uart_get_info(state, uarg); |
| 1121 | break; |
| 1122 | |
| 1123 | case TIOCSSERIAL: |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 1124 | ret = uart_set_info(tty, state, uarg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1125 | break; |
| 1126 | |
| 1127 | case TIOCSERCONFIG: |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 1128 | ret = uart_do_autoconfig(tty, state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1129 | break; |
| 1130 | |
| 1131 | case TIOCSERGWILD: /* obsolete */ |
| 1132 | case TIOCSERSWILD: /* obsolete */ |
| 1133 | ret = 0; |
| 1134 | break; |
| 1135 | } |
| 1136 | |
| 1137 | if (ret != -ENOIOCTLCMD) |
| 1138 | goto out; |
| 1139 | |
| 1140 | if (tty->flags & (1 << TTY_IO_ERROR)) { |
| 1141 | ret = -EIO; |
| 1142 | goto out; |
| 1143 | } |
| 1144 | |
| 1145 | /* |
| 1146 | * The following should only be used when hardware is present. |
| 1147 | */ |
| 1148 | switch (cmd) { |
| 1149 | case TIOCMIWAIT: |
| 1150 | ret = uart_wait_modem_status(state, arg); |
| 1151 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1152 | } |
| 1153 | |
| 1154 | if (ret != -ENOIOCTLCMD) |
| 1155 | goto out; |
| 1156 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1157 | mutex_lock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1158 | |
| 1159 | if (tty_hung_up_p(filp)) { |
| 1160 | ret = -EIO; |
| 1161 | goto out_up; |
| 1162 | } |
| 1163 | |
| 1164 | /* |
| 1165 | * All these rely on hardware being present and need to be |
| 1166 | * protected against the tty being hung up. |
| 1167 | */ |
| 1168 | switch (cmd) { |
| 1169 | case TIOCSERGETLSR: /* Get line status register */ |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 1170 | ret = uart_get_lsr_info(tty, state, uarg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1171 | break; |
| 1172 | |
| 1173 | default: { |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1174 | struct uart_port *uport = state->uart_port; |
| 1175 | if (uport->ops->ioctl) |
| 1176 | ret = uport->ops->ioctl(uport, cmd, arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1177 | break; |
| 1178 | } |
| 1179 | } |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 1180 | out_up: |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1181 | mutex_unlock(&port->mutex); |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 1182 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1183 | return ret; |
| 1184 | } |
| 1185 | |
Linus Torvalds | edeb280 | 2008-06-04 10:35:03 -0700 | [diff] [blame] | 1186 | static void uart_set_ldisc(struct tty_struct *tty) |
Alan Cox | 64e9159 | 2008-06-03 15:18:54 +0100 | [diff] [blame] | 1187 | { |
| 1188 | struct uart_state *state = tty->driver_data; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1189 | struct uart_port *uport = state->uart_port; |
Alan Cox | 64e9159 | 2008-06-03 15:18:54 +0100 | [diff] [blame] | 1190 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1191 | if (uport->ops->set_ldisc) |
Alan Cox | d87d9b7 | 2010-06-01 22:52:53 +0200 | [diff] [blame] | 1192 | uport->ops->set_ldisc(uport, tty->termios->c_line); |
Alan Cox | 64e9159 | 2008-06-03 15:18:54 +0100 | [diff] [blame] | 1193 | } |
| 1194 | |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 1195 | static void uart_set_termios(struct tty_struct *tty, |
| 1196 | struct ktermios *old_termios) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1197 | { |
| 1198 | struct uart_state *state = tty->driver_data; |
| 1199 | unsigned long flags; |
| 1200 | unsigned int cflag = tty->termios->c_cflag; |
| 1201 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1202 | |
| 1203 | /* |
| 1204 | * These are the bits that are used to setup various |
David Woodhouse | 20620d6 | 2007-08-22 14:01:11 -0700 | [diff] [blame] | 1205 | * flags in the low level driver. We can ignore the Bfoo |
| 1206 | * bits in c_cflag; c_[io]speed will always be set |
| 1207 | * appropriately by set_termios() in tty_ioctl.c |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1208 | */ |
| 1209 | #define RELEVANT_IFLAG(iflag) ((iflag) & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1210 | if ((cflag ^ old_termios->c_cflag) == 0 && |
David Woodhouse | 20620d6 | 2007-08-22 14:01:11 -0700 | [diff] [blame] | 1211 | tty->termios->c_ospeed == old_termios->c_ospeed && |
| 1212 | tty->termios->c_ispeed == old_termios->c_ispeed && |
Alan Cox | e523844 | 2008-04-30 00:53:28 -0700 | [diff] [blame] | 1213 | RELEVANT_IFLAG(tty->termios->c_iflag ^ old_termios->c_iflag) == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1214 | return; |
Alan Cox | e523844 | 2008-04-30 00:53:28 -0700 | [diff] [blame] | 1215 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1216 | |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 1217 | uart_change_speed(tty, state, old_termios); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1218 | |
| 1219 | /* Handle transition to B0 status */ |
| 1220 | if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1221 | uart_clear_mctrl(state->uart_port, TIOCM_RTS | TIOCM_DTR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1222 | /* Handle transition away from B0 status */ |
André Goddard Rosa | 82cb7ba | 2009-10-25 11:18:26 -0200 | [diff] [blame] | 1223 | else if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1224 | unsigned int mask = TIOCM_DTR; |
| 1225 | if (!(cflag & CRTSCTS) || |
| 1226 | !test_bit(TTY_THROTTLED, &tty->flags)) |
| 1227 | mask |= TIOCM_RTS; |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1228 | uart_set_mctrl(state->uart_port, mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1229 | } |
| 1230 | |
| 1231 | /* Handle turning off CRTSCTS */ |
| 1232 | if ((old_termios->c_cflag & CRTSCTS) && !(cflag & CRTSCTS)) { |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1233 | spin_lock_irqsave(&state->uart_port->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1234 | tty->hw_stopped = 0; |
| 1235 | __uart_start(tty); |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1236 | spin_unlock_irqrestore(&state->uart_port->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1237 | } |
Russell King | 0dd7a1a | 2005-06-29 18:40:53 +0100 | [diff] [blame] | 1238 | /* Handle turning on CRTSCTS */ |
André Goddard Rosa | 82cb7ba | 2009-10-25 11:18:26 -0200 | [diff] [blame] | 1239 | else if (!(old_termios->c_cflag & CRTSCTS) && (cflag & CRTSCTS)) { |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1240 | spin_lock_irqsave(&state->uart_port->lock, flags); |
| 1241 | if (!(state->uart_port->ops->get_mctrl(state->uart_port) & TIOCM_CTS)) { |
Russell King | 0dd7a1a | 2005-06-29 18:40:53 +0100 | [diff] [blame] | 1242 | tty->hw_stopped = 1; |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1243 | state->uart_port->ops->stop_tx(state->uart_port); |
Russell King | 0dd7a1a | 2005-06-29 18:40:53 +0100 | [diff] [blame] | 1244 | } |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1245 | spin_unlock_irqrestore(&state->uart_port->lock, flags); |
Russell King | 0dd7a1a | 2005-06-29 18:40:53 +0100 | [diff] [blame] | 1246 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1247 | #if 0 |
| 1248 | /* |
| 1249 | * No need to wake up processes in open wait, since they |
| 1250 | * sample the CLOCAL flag once, and don't recheck it. |
| 1251 | * XXX It's not clear whether the current behavior is correct |
| 1252 | * or not. Hence, this may change..... |
| 1253 | */ |
| 1254 | if (!(old_termios->c_cflag & CLOCAL) && |
| 1255 | (tty->termios->c_cflag & CLOCAL)) |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1256 | wake_up_interruptible(&state->uart_port.open_wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1257 | #endif |
| 1258 | } |
| 1259 | |
| 1260 | /* |
| 1261 | * In 2.4.5, calls to this will be serialized via the BKL in |
| 1262 | * linux/drivers/char/tty_io.c:tty_release() |
| 1263 | * linux/drivers/char/tty_io.c:do_tty_handup() |
| 1264 | */ |
| 1265 | static void uart_close(struct tty_struct *tty, struct file *filp) |
| 1266 | { |
| 1267 | struct uart_state *state = tty->driver_data; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1268 | struct tty_port *port; |
| 1269 | struct uart_port *uport; |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1270 | unsigned long flags; |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 1271 | |
Arnd Bergmann | ec79d60 | 2010-06-01 22:53:01 +0200 | [diff] [blame] | 1272 | BUG_ON(!tty_locked()); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1273 | |
Linus Torvalds | eea7e17 | 2009-10-12 19:13:54 +0200 | [diff] [blame] | 1274 | if (!state) |
| 1275 | return; |
| 1276 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1277 | uport = state->uart_port; |
| 1278 | port = &state->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1279 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1280 | pr_debug("uart_close(%d) called\n", uport->line); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1281 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1282 | mutex_lock(&port->mutex); |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1283 | spin_lock_irqsave(&port->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1284 | |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1285 | if (tty_hung_up_p(filp)) { |
| 1286 | spin_unlock_irqrestore(&port->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1287 | goto done; |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1288 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1289 | |
Alan Cox | 91312cd | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1290 | if ((tty->count == 1) && (port->count != 1)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1291 | /* |
| 1292 | * Uh, oh. tty->count is 1, which means that the tty |
Alan Cox | 91312cd | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1293 | * structure will be freed. port->count should always |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1294 | * be one in these conditions. If it's greater than |
| 1295 | * one, we've got real problems, since it means the |
| 1296 | * serial port won't be shutdown. |
| 1297 | */ |
| 1298 | printk(KERN_ERR "uart_close: bad serial port count; tty->count is 1, " |
Alan Cox | 91312cd | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1299 | "port->count is %d\n", port->count); |
| 1300 | port->count = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1301 | } |
Alan Cox | 91312cd | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1302 | if (--port->count < 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1303 | printk(KERN_ERR "uart_close: bad serial port count for %s: %d\n", |
Alan Cox | 91312cd | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1304 | tty->name, port->count); |
| 1305 | port->count = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1306 | } |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1307 | if (port->count) { |
| 1308 | spin_unlock_irqrestore(&port->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1309 | goto done; |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1310 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1311 | |
| 1312 | /* |
| 1313 | * Now we wait for the transmit buffer to clear; and we notify |
| 1314 | * the line discipline to only process XON/XOFF characters by |
| 1315 | * setting tty->closing. |
| 1316 | */ |
| 1317 | tty->closing = 1; |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1318 | spin_unlock_irqrestore(&port->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1319 | |
Arnd Bergmann | 2036521 | 2010-06-01 22:53:07 +0200 | [diff] [blame] | 1320 | if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE) { |
| 1321 | /* |
| 1322 | * hack: open-coded tty_wait_until_sent to avoid |
| 1323 | * recursive tty_lock |
| 1324 | */ |
| 1325 | long timeout = msecs_to_jiffies(port->closing_wait); |
| 1326 | if (wait_event_interruptible_timeout(tty->write_wait, |
| 1327 | !tty_chars_in_buffer(tty), timeout) >= 0) |
| 1328 | __uart_wait_until_sent(uport, timeout); |
| 1329 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1330 | |
| 1331 | /* |
| 1332 | * At this point, we stop accepting input. To do this, we |
| 1333 | * disable the receive line status interrupts. |
| 1334 | */ |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1335 | if (port->flags & ASYNC_INITIALIZED) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1336 | unsigned long flags; |
Linus Torvalds | eea7e17 | 2009-10-12 19:13:54 +0200 | [diff] [blame] | 1337 | spin_lock_irqsave(&uport->lock, flags); |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1338 | uport->ops->stop_rx(uport); |
Linus Torvalds | eea7e17 | 2009-10-12 19:13:54 +0200 | [diff] [blame] | 1339 | spin_unlock_irqrestore(&uport->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1340 | /* |
| 1341 | * Before we drop DTR, make sure the UART transmitter |
| 1342 | * has completely drained; this is especially |
| 1343 | * important if there is a transmit FIFO! |
| 1344 | */ |
Arnd Bergmann | 2036521 | 2010-06-01 22:53:07 +0200 | [diff] [blame] | 1345 | __uart_wait_until_sent(uport, uport->timeout); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1346 | } |
| 1347 | |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 1348 | uart_shutdown(tty, state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1349 | uart_flush_buffer(tty); |
| 1350 | |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 1351 | tty_ldisc_flush(tty); |
| 1352 | |
Alan Cox | 7b01478 | 2009-09-19 13:13:33 -0700 | [diff] [blame] | 1353 | tty_port_tty_set(port, NULL); |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1354 | spin_lock_irqsave(&port->lock, flags); |
| 1355 | tty->closing = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1356 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1357 | if (port->blocked_open) { |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1358 | spin_unlock_irqrestore(&port->lock, flags); |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1359 | if (port->close_delay) |
| 1360 | msleep_interruptible(port->close_delay); |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1361 | spin_lock_irqsave(&port->lock, flags); |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1362 | } else if (!uart_console(uport)) { |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1363 | spin_unlock_irqrestore(&port->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1364 | uart_change_pm(state, 3); |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1365 | spin_lock_irqsave(&port->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1366 | } |
| 1367 | |
| 1368 | /* |
| 1369 | * Wake up anyone trying to open this port. |
| 1370 | */ |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1371 | clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1372 | spin_unlock_irqrestore(&port->lock, flags); |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1373 | wake_up_interruptible(&port->open_wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1374 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1375 | done: |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1376 | mutex_unlock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1377 | } |
| 1378 | |
Arnd Bergmann | 2036521 | 2010-06-01 22:53:07 +0200 | [diff] [blame] | 1379 | static void __uart_wait_until_sent(struct uart_port *port, int timeout) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1380 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1381 | unsigned long char_time, expire; |
| 1382 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1383 | if (port->type == PORT_UNKNOWN || port->fifosize == 0) |
| 1384 | return; |
| 1385 | |
| 1386 | /* |
| 1387 | * Set the check interval to be 1/5 of the estimated time to |
| 1388 | * send a single character, and make it at least 1. The check |
| 1389 | * interval should also be less than the timeout. |
| 1390 | * |
| 1391 | * Note: we have to use pretty tight timings here to satisfy |
| 1392 | * the NIST-PCTS. |
| 1393 | */ |
| 1394 | char_time = (port->timeout - HZ/50) / port->fifosize; |
| 1395 | char_time = char_time / 5; |
| 1396 | if (char_time == 0) |
| 1397 | char_time = 1; |
| 1398 | if (timeout && timeout < char_time) |
| 1399 | char_time = timeout; |
| 1400 | |
| 1401 | /* |
| 1402 | * If the transmitter hasn't cleared in twice the approximate |
| 1403 | * amount of time to send the entire FIFO, it probably won't |
| 1404 | * ever clear. This assumes the UART isn't doing flow |
| 1405 | * control, which is currently the case. Hence, if it ever |
| 1406 | * takes longer than port->timeout, this is probably due to a |
| 1407 | * UART bug of some kind. So, we clamp the timeout parameter at |
| 1408 | * 2*port->timeout. |
| 1409 | */ |
| 1410 | if (timeout == 0 || timeout > 2 * port->timeout) |
| 1411 | timeout = 2 * port->timeout; |
| 1412 | |
| 1413 | expire = jiffies + timeout; |
| 1414 | |
Jiri Slaby | eb3a1e1 | 2007-05-06 14:48:52 -0700 | [diff] [blame] | 1415 | pr_debug("uart_wait_until_sent(%d), jiffies=%lu, expire=%lu...\n", |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 1416 | port->line, jiffies, expire); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1417 | |
| 1418 | /* |
| 1419 | * Check whether the transmitter is empty every 'char_time'. |
| 1420 | * 'timeout' / 'expire' give us the maximum amount of time |
| 1421 | * we wait. |
| 1422 | */ |
| 1423 | while (!port->ops->tx_empty(port)) { |
| 1424 | msleep_interruptible(jiffies_to_msecs(char_time)); |
| 1425 | if (signal_pending(current)) |
| 1426 | break; |
| 1427 | if (time_after(jiffies, expire)) |
| 1428 | break; |
| 1429 | } |
| 1430 | set_current_state(TASK_RUNNING); /* might not be needed */ |
Arnd Bergmann | 2036521 | 2010-06-01 22:53:07 +0200 | [diff] [blame] | 1431 | } |
| 1432 | |
| 1433 | static void uart_wait_until_sent(struct tty_struct *tty, int timeout) |
| 1434 | { |
| 1435 | struct uart_state *state = tty->driver_data; |
| 1436 | struct uart_port *port = state->uart_port; |
| 1437 | |
| 1438 | tty_lock(); |
| 1439 | __uart_wait_until_sent(port, timeout); |
Arnd Bergmann | ec79d60 | 2010-06-01 22:53:01 +0200 | [diff] [blame] | 1440 | tty_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1441 | } |
| 1442 | |
| 1443 | /* |
| 1444 | * This is called with the BKL held in |
| 1445 | * linux/drivers/char/tty_io.c:do_tty_hangup() |
| 1446 | * We're called from the eventd thread, so we can sleep for |
| 1447 | * a _short_ time only. |
| 1448 | */ |
| 1449 | static void uart_hangup(struct tty_struct *tty) |
| 1450 | { |
| 1451 | struct uart_state *state = tty->driver_data; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1452 | struct tty_port *port = &state->port; |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1453 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1454 | |
Arnd Bergmann | ec79d60 | 2010-06-01 22:53:01 +0200 | [diff] [blame] | 1455 | BUG_ON(!tty_locked()); |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1456 | pr_debug("uart_hangup(%d)\n", state->uart_port->line); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1457 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1458 | mutex_lock(&port->mutex); |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1459 | if (port->flags & ASYNC_NORMAL_ACTIVE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1460 | uart_flush_buffer(tty); |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 1461 | uart_shutdown(tty, state); |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1462 | spin_lock_irqsave(&port->lock, flags); |
Alan Cox | 91312cd | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1463 | port->count = 0; |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1464 | clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1465 | spin_unlock_irqrestore(&port->lock, flags); |
Alan Cox | 7b01478 | 2009-09-19 13:13:33 -0700 | [diff] [blame] | 1466 | tty_port_tty_set(port, NULL); |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1467 | wake_up_interruptible(&port->open_wait); |
Alan Cox | bdc04e3 | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1468 | wake_up_interruptible(&port->delta_msr_wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1469 | } |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1470 | mutex_unlock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1471 | } |
| 1472 | |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 1473 | /** |
| 1474 | * uart_update_termios - update the terminal hw settings |
| 1475 | * @tty: tty associated with UART |
| 1476 | * @state: UART to update |
| 1477 | * |
| 1478 | * Copy across the serial console cflag setting into the termios settings |
| 1479 | * for the initial open of the port. This allows continuity between the |
| 1480 | * kernel settings, and the settings init adopts when it opens the port |
| 1481 | * for the first time. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1482 | */ |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 1483 | static void uart_update_termios(struct tty_struct *tty, |
| 1484 | struct uart_state *state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1485 | { |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1486 | struct uart_port *port = state->uart_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1487 | |
| 1488 | if (uart_console(port) && port->cons->cflag) { |
| 1489 | tty->termios->c_cflag = port->cons->cflag; |
| 1490 | port->cons->cflag = 0; |
| 1491 | } |
| 1492 | |
| 1493 | /* |
| 1494 | * If the device failed to grab its irq resources, |
| 1495 | * or some other error occurred, don't try to talk |
| 1496 | * to the port hardware. |
| 1497 | */ |
| 1498 | if (!(tty->flags & (1 << TTY_IO_ERROR))) { |
| 1499 | /* |
| 1500 | * Make termios settings take effect. |
| 1501 | */ |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 1502 | uart_change_speed(tty, state, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1503 | |
| 1504 | /* |
| 1505 | * And finally enable the RTS and DTR signals. |
| 1506 | */ |
| 1507 | if (tty->termios->c_cflag & CBAUD) |
| 1508 | uart_set_mctrl(port, TIOCM_DTR | TIOCM_RTS); |
| 1509 | } |
| 1510 | } |
| 1511 | |
Alan Cox | de0c8cb | 2010-06-01 22:52:58 +0200 | [diff] [blame] | 1512 | static int uart_carrier_raised(struct tty_port *port) |
| 1513 | { |
| 1514 | struct uart_state *state = container_of(port, struct uart_state, port); |
| 1515 | struct uart_port *uport = state->uart_port; |
| 1516 | int mctrl; |
Alan Cox | de0c8cb | 2010-06-01 22:52:58 +0200 | [diff] [blame] | 1517 | spin_lock_irq(&uport->lock); |
| 1518 | uport->ops->enable_ms(uport); |
| 1519 | mctrl = uport->ops->get_mctrl(uport); |
| 1520 | spin_unlock_irq(&uport->lock); |
Alan Cox | de0c8cb | 2010-06-01 22:52:58 +0200 | [diff] [blame] | 1521 | if (mctrl & TIOCM_CAR) |
| 1522 | return 1; |
| 1523 | return 0; |
| 1524 | } |
| 1525 | |
| 1526 | static void uart_dtr_rts(struct tty_port *port, int onoff) |
| 1527 | { |
| 1528 | struct uart_state *state = container_of(port, struct uart_state, port); |
| 1529 | struct uart_port *uport = state->uart_port; |
Alan Cox | 24fcc7c | 2010-06-01 22:52:59 +0200 | [diff] [blame] | 1530 | |
Arnd Bergmann | 3f582b8 | 2010-06-29 22:31:40 +0200 | [diff] [blame] | 1531 | if (onoff) { |
Alan Cox | de0c8cb | 2010-06-01 22:52:58 +0200 | [diff] [blame] | 1532 | uart_set_mctrl(uport, TIOCM_DTR | TIOCM_RTS); |
Arnd Bergmann | 3f582b8 | 2010-06-29 22:31:40 +0200 | [diff] [blame] | 1533 | |
| 1534 | /* |
| 1535 | * If this is the first open to succeed, |
| 1536 | * adjust things to suit. |
| 1537 | */ |
| 1538 | if (!test_and_set_bit(ASYNCB_NORMAL_ACTIVE, &port->flags)) |
| 1539 | uart_update_termios(port->tty, state); |
| 1540 | } |
Alan Cox | de0c8cb | 2010-06-01 22:52:58 +0200 | [diff] [blame] | 1541 | else |
| 1542 | uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); |
Alan Cox | de0c8cb | 2010-06-01 22:52:58 +0200 | [diff] [blame] | 1543 | } |
| 1544 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1545 | static struct uart_state *uart_get(struct uart_driver *drv, int line) |
| 1546 | { |
| 1547 | struct uart_state *state; |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1548 | struct tty_port *port; |
Russell King | 68ac64c | 2006-04-30 11:13:50 +0100 | [diff] [blame] | 1549 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1550 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1551 | state = drv->state + line; |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1552 | port = &state->port; |
| 1553 | if (mutex_lock_interruptible(&port->mutex)) { |
Russell King | 68ac64c | 2006-04-30 11:13:50 +0100 | [diff] [blame] | 1554 | ret = -ERESTARTSYS; |
| 1555 | goto err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1556 | } |
| 1557 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1558 | port->count++; |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1559 | if (!state->uart_port || state->uart_port->flags & UPF_DEAD) { |
Russell King | 68ac64c | 2006-04-30 11:13:50 +0100 | [diff] [blame] | 1560 | ret = -ENXIO; |
| 1561 | goto err_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1562 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1563 | return state; |
Russell King | 68ac64c | 2006-04-30 11:13:50 +0100 | [diff] [blame] | 1564 | |
| 1565 | err_unlock: |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1566 | port->count--; |
| 1567 | mutex_unlock(&port->mutex); |
Russell King | 68ac64c | 2006-04-30 11:13:50 +0100 | [diff] [blame] | 1568 | err: |
| 1569 | return ERR_PTR(ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1570 | } |
| 1571 | |
| 1572 | /* |
Denis Cheng | 922f9cf | 2008-02-08 04:22:00 -0800 | [diff] [blame] | 1573 | * calls to uart_open are serialised by the BKL in |
| 1574 | * fs/char_dev.c:chrdev_open() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1575 | * Note that if this fails, then uart_close() _will_ be called. |
| 1576 | * |
| 1577 | * In time, we want to scrap the "opening nonpresent ports" |
| 1578 | * behaviour and implement an alternative way for setserial |
| 1579 | * to set base addresses/ports/types. This will allow us to |
| 1580 | * get rid of a certain amount of extra tests. |
| 1581 | */ |
| 1582 | static int uart_open(struct tty_struct *tty, struct file *filp) |
| 1583 | { |
| 1584 | struct uart_driver *drv = (struct uart_driver *)tty->driver->driver_state; |
| 1585 | struct uart_state *state; |
Alan Cox | 91312cd | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1586 | struct tty_port *port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1587 | int retval, line = tty->index; |
| 1588 | |
Arnd Bergmann | ec79d60 | 2010-06-01 22:53:01 +0200 | [diff] [blame] | 1589 | BUG_ON(!tty_locked()); |
Jiri Slaby | eb3a1e1 | 2007-05-06 14:48:52 -0700 | [diff] [blame] | 1590 | pr_debug("uart_open(%d) called\n", line); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1591 | |
| 1592 | /* |
| 1593 | * tty->driver->num won't change, so we won't fail here with |
| 1594 | * tty->driver_data set to something non-NULL (and therefore |
| 1595 | * we won't get caught by uart_close()). |
| 1596 | */ |
| 1597 | retval = -ENODEV; |
| 1598 | if (line >= tty->driver->num) |
| 1599 | goto fail; |
| 1600 | |
| 1601 | /* |
| 1602 | * We take the semaphore inside uart_get to guarantee that we won't |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1603 | * be re-entered while allocating the state structure, or while we |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1604 | * request any IRQs that the driver may need. This also has the nice |
| 1605 | * side-effect that it delays the action of uart_hangup, so we can |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1606 | * guarantee that state->port.tty will always contain something |
| 1607 | * reasonable. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1608 | */ |
| 1609 | state = uart_get(drv, line); |
| 1610 | if (IS_ERR(state)) { |
| 1611 | retval = PTR_ERR(state); |
| 1612 | goto fail; |
| 1613 | } |
Alan Cox | 91312cd | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1614 | port = &state->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1615 | |
| 1616 | /* |
| 1617 | * Once we set tty->driver_data here, we are guaranteed that |
| 1618 | * uart_close() will decrement the driver module use count. |
| 1619 | * Any failures from here onwards should not touch the count. |
| 1620 | */ |
| 1621 | tty->driver_data = state; |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1622 | state->uart_port->state = state; |
| 1623 | tty->low_latency = (state->uart_port->flags & UPF_LOW_LATENCY) ? 1 : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1624 | tty->alt_speed = 0; |
Alan Cox | 7b01478 | 2009-09-19 13:13:33 -0700 | [diff] [blame] | 1625 | tty_port_tty_set(port, tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1626 | |
| 1627 | /* |
| 1628 | * If the port is in the middle of closing, bail out now. |
| 1629 | */ |
| 1630 | if (tty_hung_up_p(filp)) { |
| 1631 | retval = -EAGAIN; |
Alan Cox | 91312cd | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1632 | port->count--; |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1633 | mutex_unlock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1634 | goto fail; |
| 1635 | } |
| 1636 | |
| 1637 | /* |
| 1638 | * Make sure the device is in D0 state. |
| 1639 | */ |
Alan Cox | 91312cd | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1640 | if (port->count == 1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1641 | uart_change_pm(state, 0); |
| 1642 | |
| 1643 | /* |
| 1644 | * Start up the serial port. |
| 1645 | */ |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 1646 | retval = uart_startup(tty, state, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1647 | |
| 1648 | /* |
| 1649 | * If we succeeded, wait until the port is ready. |
| 1650 | */ |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1651 | mutex_unlock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1652 | if (retval == 0) |
Alan Cox | 74c2107 | 2010-06-01 22:53:00 +0200 | [diff] [blame] | 1653 | retval = tty_port_block_til_ready(port, tty, filp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1654 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1655 | fail: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1656 | return retval; |
| 1657 | } |
| 1658 | |
| 1659 | static const char *uart_type(struct uart_port *port) |
| 1660 | { |
| 1661 | const char *str = NULL; |
| 1662 | |
| 1663 | if (port->ops->type) |
| 1664 | str = port->ops->type(port); |
| 1665 | |
| 1666 | if (!str) |
| 1667 | str = "unknown"; |
| 1668 | |
| 1669 | return str; |
| 1670 | } |
| 1671 | |
| 1672 | #ifdef CONFIG_PROC_FS |
| 1673 | |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1674 | static void uart_line_info(struct seq_file *m, struct uart_driver *drv, int i) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1675 | { |
| 1676 | struct uart_state *state = drv->state + i; |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1677 | struct tty_port *port = &state->port; |
George G. Davis | 3689a0e | 2007-02-14 00:33:06 -0800 | [diff] [blame] | 1678 | int pm_state; |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1679 | struct uart_port *uport = state->uart_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1680 | char stat_buf[32]; |
| 1681 | unsigned int status; |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1682 | int mmio; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1683 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1684 | if (!uport) |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1685 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1686 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1687 | mmio = uport->iotype >= UPIO_MEM; |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1688 | seq_printf(m, "%d: uart:%s %s%08llX irq:%d", |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1689 | uport->line, uart_type(uport), |
Sergei Shtylyov | 6c6a233 | 2006-09-04 00:04:20 +0400 | [diff] [blame] | 1690 | mmio ? "mmio:0x" : "port:", |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1691 | mmio ? (unsigned long long)uport->mapbase |
| 1692 | : (unsigned long long)uport->iobase, |
| 1693 | uport->irq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1694 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1695 | if (uport->type == PORT_UNKNOWN) { |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1696 | seq_putc(m, '\n'); |
| 1697 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1698 | } |
| 1699 | |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 1700 | if (capable(CAP_SYS_ADMIN)) { |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1701 | mutex_lock(&port->mutex); |
George G. Davis | 3689a0e | 2007-02-14 00:33:06 -0800 | [diff] [blame] | 1702 | pm_state = state->pm_state; |
| 1703 | if (pm_state) |
| 1704 | uart_change_pm(state, 0); |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1705 | spin_lock_irq(&uport->lock); |
| 1706 | status = uport->ops->get_mctrl(uport); |
| 1707 | spin_unlock_irq(&uport->lock); |
George G. Davis | 3689a0e | 2007-02-14 00:33:06 -0800 | [diff] [blame] | 1708 | if (pm_state) |
| 1709 | uart_change_pm(state, pm_state); |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1710 | mutex_unlock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1711 | |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1712 | seq_printf(m, " tx:%d rx:%d", |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1713 | uport->icount.tx, uport->icount.rx); |
| 1714 | if (uport->icount.frame) |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1715 | seq_printf(m, " fe:%d", |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1716 | uport->icount.frame); |
| 1717 | if (uport->icount.parity) |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1718 | seq_printf(m, " pe:%d", |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1719 | uport->icount.parity); |
| 1720 | if (uport->icount.brk) |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1721 | seq_printf(m, " brk:%d", |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1722 | uport->icount.brk); |
| 1723 | if (uport->icount.overrun) |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1724 | seq_printf(m, " oe:%d", |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1725 | uport->icount.overrun); |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 1726 | |
| 1727 | #define INFOBIT(bit, str) \ |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1728 | if (uport->mctrl & (bit)) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1729 | strncat(stat_buf, (str), sizeof(stat_buf) - \ |
| 1730 | strlen(stat_buf) - 2) |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 1731 | #define STATBIT(bit, str) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1732 | if (status & (bit)) \ |
| 1733 | strncat(stat_buf, (str), sizeof(stat_buf) - \ |
| 1734 | strlen(stat_buf) - 2) |
| 1735 | |
| 1736 | stat_buf[0] = '\0'; |
| 1737 | stat_buf[1] = '\0'; |
| 1738 | INFOBIT(TIOCM_RTS, "|RTS"); |
| 1739 | STATBIT(TIOCM_CTS, "|CTS"); |
| 1740 | INFOBIT(TIOCM_DTR, "|DTR"); |
| 1741 | STATBIT(TIOCM_DSR, "|DSR"); |
| 1742 | STATBIT(TIOCM_CAR, "|CD"); |
| 1743 | STATBIT(TIOCM_RNG, "|RI"); |
| 1744 | if (stat_buf[0]) |
| 1745 | stat_buf[0] = ' '; |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 1746 | |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1747 | seq_puts(m, stat_buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1748 | } |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1749 | seq_putc(m, '\n'); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1750 | #undef STATBIT |
| 1751 | #undef INFOBIT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1752 | } |
| 1753 | |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1754 | static int uart_proc_show(struct seq_file *m, void *v) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1755 | { |
Alexey Dobriyan | 833bb30 | 2009-04-02 01:30:04 +0400 | [diff] [blame] | 1756 | struct tty_driver *ttydrv = m->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1757 | struct uart_driver *drv = ttydrv->driver_state; |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1758 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1759 | |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1760 | seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1761 | "", "", ""); |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1762 | for (i = 0; i < drv->nr; i++) |
| 1763 | uart_line_info(m, drv, i); |
| 1764 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1765 | } |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1766 | |
| 1767 | static int uart_proc_open(struct inode *inode, struct file *file) |
| 1768 | { |
| 1769 | return single_open(file, uart_proc_show, PDE(inode)->data); |
| 1770 | } |
| 1771 | |
| 1772 | static const struct file_operations uart_proc_fops = { |
| 1773 | .owner = THIS_MODULE, |
| 1774 | .open = uart_proc_open, |
| 1775 | .read = seq_read, |
| 1776 | .llseek = seq_lseek, |
| 1777 | .release = single_release, |
| 1778 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1779 | #endif |
| 1780 | |
Andrew Morton | 4a1b550 | 2008-03-07 15:51:16 -0800 | [diff] [blame] | 1781 | #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1782 | /* |
Russell King | d358788 | 2006-03-20 20:00:09 +0000 | [diff] [blame] | 1783 | * uart_console_write - write a console message to a serial port |
| 1784 | * @port: the port to write the message |
| 1785 | * @s: array of characters |
| 1786 | * @count: number of characters in string to write |
| 1787 | * @write: function to write character to port |
| 1788 | */ |
| 1789 | void uart_console_write(struct uart_port *port, const char *s, |
| 1790 | unsigned int count, |
| 1791 | void (*putchar)(struct uart_port *, int)) |
| 1792 | { |
| 1793 | unsigned int i; |
| 1794 | |
| 1795 | for (i = 0; i < count; i++, s++) { |
| 1796 | if (*s == '\n') |
| 1797 | putchar(port, '\r'); |
| 1798 | putchar(port, *s); |
| 1799 | } |
| 1800 | } |
| 1801 | EXPORT_SYMBOL_GPL(uart_console_write); |
| 1802 | |
| 1803 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1804 | * Check whether an invalid uart number has been specified, and |
| 1805 | * if so, search for the first available port that does have |
| 1806 | * console support. |
| 1807 | */ |
| 1808 | struct uart_port * __init |
| 1809 | uart_get_console(struct uart_port *ports, int nr, struct console *co) |
| 1810 | { |
| 1811 | int idx = co->index; |
| 1812 | |
| 1813 | if (idx < 0 || idx >= nr || (ports[idx].iobase == 0 && |
| 1814 | ports[idx].membase == NULL)) |
| 1815 | for (idx = 0; idx < nr; idx++) |
| 1816 | if (ports[idx].iobase != 0 || |
| 1817 | ports[idx].membase != NULL) |
| 1818 | break; |
| 1819 | |
| 1820 | co->index = idx; |
| 1821 | |
| 1822 | return ports + idx; |
| 1823 | } |
| 1824 | |
| 1825 | /** |
| 1826 | * uart_parse_options - Parse serial port baud/parity/bits/flow contro. |
| 1827 | * @options: pointer to option string |
| 1828 | * @baud: pointer to an 'int' variable for the baud rate. |
| 1829 | * @parity: pointer to an 'int' variable for the parity. |
| 1830 | * @bits: pointer to an 'int' variable for the number of data bits. |
| 1831 | * @flow: pointer to an 'int' variable for the flow control character. |
| 1832 | * |
| 1833 | * uart_parse_options decodes a string containing the serial console |
| 1834 | * options. The format of the string is <baud><parity><bits><flow>, |
| 1835 | * eg: 115200n8r |
| 1836 | */ |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 1837 | void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1838 | uart_parse_options(char *options, int *baud, int *parity, int *bits, int *flow) |
| 1839 | { |
| 1840 | char *s = options; |
| 1841 | |
| 1842 | *baud = simple_strtoul(s, NULL, 10); |
| 1843 | while (*s >= '0' && *s <= '9') |
| 1844 | s++; |
| 1845 | if (*s) |
| 1846 | *parity = *s++; |
| 1847 | if (*s) |
| 1848 | *bits = *s++ - '0'; |
| 1849 | if (*s) |
| 1850 | *flow = *s; |
| 1851 | } |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 1852 | EXPORT_SYMBOL_GPL(uart_parse_options); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1853 | |
| 1854 | struct baud_rates { |
| 1855 | unsigned int rate; |
| 1856 | unsigned int cflag; |
| 1857 | }; |
| 1858 | |
Arjan van de Ven | cb3592b | 2005-11-28 21:04:11 +0000 | [diff] [blame] | 1859 | static const struct baud_rates baud_rates[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1860 | { 921600, B921600 }, |
| 1861 | { 460800, B460800 }, |
| 1862 | { 230400, B230400 }, |
| 1863 | { 115200, B115200 }, |
| 1864 | { 57600, B57600 }, |
| 1865 | { 38400, B38400 }, |
| 1866 | { 19200, B19200 }, |
| 1867 | { 9600, B9600 }, |
| 1868 | { 4800, B4800 }, |
| 1869 | { 2400, B2400 }, |
| 1870 | { 1200, B1200 }, |
| 1871 | { 0, B38400 } |
| 1872 | }; |
| 1873 | |
| 1874 | /** |
| 1875 | * uart_set_options - setup the serial console parameters |
| 1876 | * @port: pointer to the serial ports uart_port structure |
| 1877 | * @co: console pointer |
| 1878 | * @baud: baud rate |
| 1879 | * @parity: parity character - 'n' (none), 'o' (odd), 'e' (even) |
| 1880 | * @bits: number of data bits |
| 1881 | * @flow: flow control character - 'r' (rts) |
| 1882 | */ |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 1883 | int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1884 | uart_set_options(struct uart_port *port, struct console *co, |
| 1885 | int baud, int parity, int bits, int flow) |
| 1886 | { |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 1887 | struct ktermios termios; |
Alan Cox | 149b36e | 2007-10-18 01:24:16 -0700 | [diff] [blame] | 1888 | static struct ktermios dummy; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1889 | int i; |
| 1890 | |
Russell King | 976ecd1 | 2005-07-03 21:05:45 +0100 | [diff] [blame] | 1891 | /* |
| 1892 | * Ensure that the serial console lock is initialised |
| 1893 | * early. |
| 1894 | */ |
| 1895 | spin_lock_init(&port->lock); |
Ingo Molnar | 13e8359 | 2006-07-03 00:25:03 -0700 | [diff] [blame] | 1896 | lockdep_set_class(&port->lock, &port_lock_key); |
Russell King | 976ecd1 | 2005-07-03 21:05:45 +0100 | [diff] [blame] | 1897 | |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 1898 | memset(&termios, 0, sizeof(struct ktermios)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1899 | |
| 1900 | termios.c_cflag = CREAD | HUPCL | CLOCAL; |
| 1901 | |
| 1902 | /* |
| 1903 | * Construct a cflag setting. |
| 1904 | */ |
| 1905 | for (i = 0; baud_rates[i].rate; i++) |
| 1906 | if (baud_rates[i].rate <= baud) |
| 1907 | break; |
| 1908 | |
| 1909 | termios.c_cflag |= baud_rates[i].cflag; |
| 1910 | |
| 1911 | if (bits == 7) |
| 1912 | termios.c_cflag |= CS7; |
| 1913 | else |
| 1914 | termios.c_cflag |= CS8; |
| 1915 | |
| 1916 | switch (parity) { |
| 1917 | case 'o': case 'O': |
| 1918 | termios.c_cflag |= PARODD; |
| 1919 | /*fall through*/ |
| 1920 | case 'e': case 'E': |
| 1921 | termios.c_cflag |= PARENB; |
| 1922 | break; |
| 1923 | } |
| 1924 | |
| 1925 | if (flow == 'r') |
| 1926 | termios.c_cflag |= CRTSCTS; |
| 1927 | |
Yinghai Lu | 7949268 | 2007-07-15 23:37:25 -0700 | [diff] [blame] | 1928 | /* |
| 1929 | * some uarts on other side don't support no flow control. |
| 1930 | * So we set * DTR in host uart to make them happy |
| 1931 | */ |
| 1932 | port->mctrl |= TIOCM_DTR; |
| 1933 | |
Alan Cox | 149b36e | 2007-10-18 01:24:16 -0700 | [diff] [blame] | 1934 | port->ops->set_termios(port, &termios, &dummy); |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 1935 | /* |
| 1936 | * Allow the setting of the UART parameters with a NULL console |
| 1937 | * too: |
| 1938 | */ |
| 1939 | if (co) |
| 1940 | co->cflag = termios.c_cflag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1941 | |
| 1942 | return 0; |
| 1943 | } |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 1944 | EXPORT_SYMBOL_GPL(uart_set_options); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1945 | #endif /* CONFIG_SERIAL_CORE_CONSOLE */ |
| 1946 | |
| 1947 | static void uart_change_pm(struct uart_state *state, int pm_state) |
| 1948 | { |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1949 | struct uart_port *port = state->uart_port; |
Andrew Victor | 1281e36 | 2006-05-16 11:28:49 +0100 | [diff] [blame] | 1950 | |
| 1951 | if (state->pm_state != pm_state) { |
| 1952 | if (port->ops->pm) |
| 1953 | port->ops->pm(port, pm_state, state->pm_state); |
| 1954 | state->pm_state = pm_state; |
| 1955 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1956 | } |
| 1957 | |
Guennadi Liakhovetski | b3b708f | 2007-10-16 01:24:02 -0700 | [diff] [blame] | 1958 | struct uart_match { |
| 1959 | struct uart_port *port; |
| 1960 | struct uart_driver *driver; |
| 1961 | }; |
| 1962 | |
| 1963 | static int serial_match_port(struct device *dev, void *data) |
| 1964 | { |
| 1965 | struct uart_match *match = data; |
Guennadi Liakhovetski | 7ca796f | 2008-07-04 09:59:28 -0700 | [diff] [blame] | 1966 | struct tty_driver *tty_drv = match->driver->tty_driver; |
| 1967 | dev_t devt = MKDEV(tty_drv->major, tty_drv->minor_start) + |
| 1968 | match->port->line; |
Guennadi Liakhovetski | b3b708f | 2007-10-16 01:24:02 -0700 | [diff] [blame] | 1969 | |
| 1970 | return dev->devt == devt; /* Actually, only one tty per port */ |
| 1971 | } |
| 1972 | |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1973 | int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1974 | { |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1975 | struct uart_state *state = drv->state + uport->line; |
| 1976 | struct tty_port *port = &state->port; |
Guennadi Liakhovetski | b3b708f | 2007-10-16 01:24:02 -0700 | [diff] [blame] | 1977 | struct device *tty_dev; |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1978 | struct uart_match match = {uport, drv}; |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 1979 | struct tty_struct *tty; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1980 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1981 | mutex_lock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1982 | |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 1983 | /* Must be inside the mutex lock until we convert to tty_port */ |
| 1984 | tty = port->tty; |
| 1985 | |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1986 | tty_dev = device_find_child(uport->dev, &match, serial_match_port); |
Guennadi Liakhovetski | b3b708f | 2007-10-16 01:24:02 -0700 | [diff] [blame] | 1987 | if (device_may_wakeup(tty_dev)) { |
Govindraj.R | 3f960db | 2010-12-16 18:12:47 +0530 | [diff] [blame] | 1988 | if (!enable_irq_wake(uport->irq)) |
| 1989 | uport->irq_wake = 1; |
Guennadi Liakhovetski | b3b708f | 2007-10-16 01:24:02 -0700 | [diff] [blame] | 1990 | put_device(tty_dev); |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1991 | mutex_unlock(&port->mutex); |
Guennadi Liakhovetski | b3b708f | 2007-10-16 01:24:02 -0700 | [diff] [blame] | 1992 | return 0; |
| 1993 | } |
Stanislav Brabec | 4547be7 | 2009-12-02 16:20:56 +0100 | [diff] [blame] | 1994 | if (console_suspend_enabled || !uart_console(uport)) |
| 1995 | uport->suspended = 1; |
Guennadi Liakhovetski | b3b708f | 2007-10-16 01:24:02 -0700 | [diff] [blame] | 1996 | |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1997 | if (port->flags & ASYNC_INITIALIZED) { |
| 1998 | const struct uart_ops *ops = uport->ops; |
Russell King | c8c6bfa | 2008-02-04 22:27:52 -0800 | [diff] [blame] | 1999 | int tries; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2000 | |
Stanislav Brabec | 4547be7 | 2009-12-02 16:20:56 +0100 | [diff] [blame] | 2001 | if (console_suspend_enabled || !uart_console(uport)) { |
| 2002 | set_bit(ASYNCB_SUSPENDED, &port->flags); |
| 2003 | clear_bit(ASYNCB_INITIALIZED, &port->flags); |
Russell King | a6b93a9 | 2006-10-01 17:17:40 +0100 | [diff] [blame] | 2004 | |
Stanislav Brabec | 4547be7 | 2009-12-02 16:20:56 +0100 | [diff] [blame] | 2005 | spin_lock_irq(&uport->lock); |
| 2006 | ops->stop_tx(uport); |
| 2007 | ops->set_mctrl(uport, 0); |
| 2008 | ops->stop_rx(uport); |
| 2009 | spin_unlock_irq(&uport->lock); |
| 2010 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2011 | |
| 2012 | /* |
| 2013 | * Wait for the transmitter to empty. |
| 2014 | */ |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 2015 | for (tries = 3; !ops->tx_empty(uport) && tries; tries--) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2016 | msleep(10); |
Russell King | c8c6bfa | 2008-02-04 22:27:52 -0800 | [diff] [blame] | 2017 | if (!tries) |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 2018 | printk(KERN_ERR "%s%s%s%d: Unable to drain " |
| 2019 | "transmitter\n", |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 2020 | uport->dev ? dev_name(uport->dev) : "", |
| 2021 | uport->dev ? ": " : "", |
David S. Miller | 8440838 | 2008-10-13 10:45:26 +0100 | [diff] [blame] | 2022 | drv->dev_name, |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 2023 | drv->tty_driver->name_base + uport->line); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2024 | |
Stanislav Brabec | 4547be7 | 2009-12-02 16:20:56 +0100 | [diff] [blame] | 2025 | if (console_suspend_enabled || !uart_console(uport)) |
| 2026 | ops->shutdown(uport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2027 | } |
| 2028 | |
| 2029 | /* |
| 2030 | * Disable the console device before suspending. |
| 2031 | */ |
Stanislav Brabec | 4547be7 | 2009-12-02 16:20:56 +0100 | [diff] [blame] | 2032 | if (console_suspend_enabled && uart_console(uport)) |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 2033 | console_stop(uport->cons); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2034 | |
Stanislav Brabec | 4547be7 | 2009-12-02 16:20:56 +0100 | [diff] [blame] | 2035 | if (console_suspend_enabled || !uart_console(uport)) |
| 2036 | uart_change_pm(state, 3); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2037 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2038 | mutex_unlock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2039 | |
| 2040 | return 0; |
| 2041 | } |
| 2042 | |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 2043 | int uart_resume_port(struct uart_driver *drv, struct uart_port *uport) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2044 | { |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 2045 | struct uart_state *state = drv->state + uport->line; |
| 2046 | struct tty_port *port = &state->port; |
Arjan van de Ven | 03a74dc | 2008-05-23 13:04:49 -0700 | [diff] [blame] | 2047 | struct device *tty_dev; |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 2048 | struct uart_match match = {uport, drv}; |
Deepak Saxena | ba15ab0 | 2009-09-19 13:13:33 -0700 | [diff] [blame] | 2049 | struct ktermios termios; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2050 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2051 | mutex_lock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2052 | |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 2053 | tty_dev = device_find_child(uport->dev, &match, serial_match_port); |
| 2054 | if (!uport->suspended && device_may_wakeup(tty_dev)) { |
Govindraj.R | 3f960db | 2010-12-16 18:12:47 +0530 | [diff] [blame] | 2055 | if (uport->irq_wake) { |
| 2056 | disable_irq_wake(uport->irq); |
| 2057 | uport->irq_wake = 0; |
| 2058 | } |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2059 | mutex_unlock(&port->mutex); |
Guennadi Liakhovetski | b3b708f | 2007-10-16 01:24:02 -0700 | [diff] [blame] | 2060 | return 0; |
| 2061 | } |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 2062 | uport->suspended = 0; |
Guennadi Liakhovetski | b3b708f | 2007-10-16 01:24:02 -0700 | [diff] [blame] | 2063 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2064 | /* |
| 2065 | * Re-enable the console device after suspending. |
| 2066 | */ |
Jason Wang | ca2e71a | 2010-08-21 15:14:41 +0800 | [diff] [blame] | 2067 | if (console_suspend_enabled && uart_console(uport)) { |
Jason Wang | 891b9dd | 2010-08-21 15:14:42 +0800 | [diff] [blame] | 2068 | /* |
| 2069 | * First try to use the console cflag setting. |
| 2070 | */ |
| 2071 | memset(&termios, 0, sizeof(struct ktermios)); |
| 2072 | termios.c_cflag = uport->cons->cflag; |
| 2073 | |
| 2074 | /* |
| 2075 | * If that's unset, use the tty termios setting. |
| 2076 | */ |
| 2077 | if (port->tty && port->tty->termios && termios.c_cflag == 0) |
| 2078 | termios = *(port->tty->termios); |
| 2079 | |
Russell King | 9d778a6 | 2008-02-04 22:27:51 -0800 | [diff] [blame] | 2080 | uart_change_pm(state, 0); |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 2081 | uport->ops->set_termios(uport, &termios, NULL); |
| 2082 | console_start(uport->cons); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2083 | } |
| 2084 | |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 2085 | if (port->flags & ASYNC_SUSPENDED) { |
| 2086 | const struct uart_ops *ops = uport->ops; |
Russell King | ee31b33 | 2005-11-13 15:28:51 +0000 | [diff] [blame] | 2087 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2088 | |
Russell King | 9d778a6 | 2008-02-04 22:27:51 -0800 | [diff] [blame] | 2089 | uart_change_pm(state, 0); |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 2090 | spin_lock_irq(&uport->lock); |
| 2091 | ops->set_mctrl(uport, 0); |
| 2092 | spin_unlock_irq(&uport->lock); |
Stanislav Brabec | 4547be7 | 2009-12-02 16:20:56 +0100 | [diff] [blame] | 2093 | if (console_suspend_enabled || !uart_console(uport)) { |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 2094 | /* Protected by port mutex for now */ |
| 2095 | struct tty_struct *tty = port->tty; |
Stanislav Brabec | 4547be7 | 2009-12-02 16:20:56 +0100 | [diff] [blame] | 2096 | ret = ops->startup(uport); |
| 2097 | if (ret == 0) { |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 2098 | if (tty) |
| 2099 | uart_change_speed(tty, state, NULL); |
Stanislav Brabec | 4547be7 | 2009-12-02 16:20:56 +0100 | [diff] [blame] | 2100 | spin_lock_irq(&uport->lock); |
| 2101 | ops->set_mctrl(uport, uport->mctrl); |
| 2102 | ops->start_tx(uport); |
| 2103 | spin_unlock_irq(&uport->lock); |
| 2104 | set_bit(ASYNCB_INITIALIZED, &port->flags); |
| 2105 | } else { |
| 2106 | /* |
| 2107 | * Failed to resume - maybe hardware went away? |
| 2108 | * Clear the "initialized" flag so we won't try |
| 2109 | * to call the low level drivers shutdown method. |
| 2110 | */ |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 2111 | uart_shutdown(tty, state); |
Stanislav Brabec | 4547be7 | 2009-12-02 16:20:56 +0100 | [diff] [blame] | 2112 | } |
Russell King | ee31b33 | 2005-11-13 15:28:51 +0000 | [diff] [blame] | 2113 | } |
Russell King | a6b93a9 | 2006-10-01 17:17:40 +0100 | [diff] [blame] | 2114 | |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 2115 | clear_bit(ASYNCB_SUSPENDED, &port->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2116 | } |
| 2117 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2118 | mutex_unlock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2119 | |
| 2120 | return 0; |
| 2121 | } |
| 2122 | |
| 2123 | static inline void |
| 2124 | uart_report_port(struct uart_driver *drv, struct uart_port *port) |
| 2125 | { |
Russell King | 30b7a3b | 2005-09-03 15:30:21 +0100 | [diff] [blame] | 2126 | char address[64]; |
| 2127 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2128 | switch (port->iotype) { |
| 2129 | case UPIO_PORT: |
Andrew Morton | 9bde10a | 2008-10-13 10:35:42 +0100 | [diff] [blame] | 2130 | snprintf(address, sizeof(address), "I/O 0x%lx", port->iobase); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2131 | break; |
| 2132 | case UPIO_HUB6: |
Russell King | 30b7a3b | 2005-09-03 15:30:21 +0100 | [diff] [blame] | 2133 | snprintf(address, sizeof(address), |
Andrew Morton | 9bde10a | 2008-10-13 10:35:42 +0100 | [diff] [blame] | 2134 | "I/O 0x%lx offset 0x%x", port->iobase, port->hub6); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2135 | break; |
| 2136 | case UPIO_MEM: |
| 2137 | case UPIO_MEM32: |
Pantelis Antoniou | 21c614a | 2005-11-06 09:07:03 +0000 | [diff] [blame] | 2138 | case UPIO_AU: |
Zang Roy-r61911 | 3be91ec | 2006-06-30 02:29:58 -0700 | [diff] [blame] | 2139 | case UPIO_TSI: |
Marc St-Jean | beab697 | 2007-05-06 14:48:45 -0700 | [diff] [blame] | 2140 | case UPIO_DWAPB: |
Jamie Iles | a3ae0fc | 2010-12-01 23:39:36 +0000 | [diff] [blame] | 2141 | case UPIO_DWAPB32: |
Russell King | 30b7a3b | 2005-09-03 15:30:21 +0100 | [diff] [blame] | 2142 | snprintf(address, sizeof(address), |
Josh Boyer | 4f640ef | 2007-07-23 18:43:44 -0700 | [diff] [blame] | 2143 | "MMIO 0x%llx", (unsigned long long)port->mapbase); |
Russell King | 30b7a3b | 2005-09-03 15:30:21 +0100 | [diff] [blame] | 2144 | break; |
| 2145 | default: |
| 2146 | strlcpy(address, "*unknown*", sizeof(address)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2147 | break; |
| 2148 | } |
Russell King | 30b7a3b | 2005-09-03 15:30:21 +0100 | [diff] [blame] | 2149 | |
Russell King | 0cf669d | 2005-10-31 11:42:22 +0000 | [diff] [blame] | 2150 | printk(KERN_INFO "%s%s%s%d at %s (irq = %d) is a %s\n", |
Kay Sievers | 4bfe090 | 2009-01-06 10:44:37 -0800 | [diff] [blame] | 2151 | port->dev ? dev_name(port->dev) : "", |
Russell King | 0cf669d | 2005-10-31 11:42:22 +0000 | [diff] [blame] | 2152 | port->dev ? ": " : "", |
David S. Miller | 8440838 | 2008-10-13 10:45:26 +0100 | [diff] [blame] | 2153 | drv->dev_name, |
| 2154 | drv->tty_driver->name_base + port->line, |
| 2155 | address, port->irq, uart_type(port)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2156 | } |
| 2157 | |
| 2158 | static void |
| 2159 | uart_configure_port(struct uart_driver *drv, struct uart_state *state, |
| 2160 | struct uart_port *port) |
| 2161 | { |
| 2162 | unsigned int flags; |
| 2163 | |
| 2164 | /* |
| 2165 | * If there isn't a port here, don't do anything further. |
| 2166 | */ |
| 2167 | if (!port->iobase && !port->mapbase && !port->membase) |
| 2168 | return; |
| 2169 | |
| 2170 | /* |
| 2171 | * Now do the auto configuration stuff. Note that config_port |
| 2172 | * is expected to claim the resources and map the port for us. |
| 2173 | */ |
David Daney | 8e23fcc | 2009-01-02 13:49:54 +0000 | [diff] [blame] | 2174 | flags = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2175 | if (port->flags & UPF_AUTO_IRQ) |
| 2176 | flags |= UART_CONFIG_IRQ; |
| 2177 | if (port->flags & UPF_BOOT_AUTOCONF) { |
David Daney | 8e23fcc | 2009-01-02 13:49:54 +0000 | [diff] [blame] | 2178 | if (!(port->flags & UPF_FIXED_TYPE)) { |
| 2179 | port->type = PORT_UNKNOWN; |
| 2180 | flags |= UART_CONFIG_TYPE; |
| 2181 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2182 | port->ops->config_port(port, flags); |
| 2183 | } |
| 2184 | |
| 2185 | if (port->type != PORT_UNKNOWN) { |
| 2186 | unsigned long flags; |
| 2187 | |
| 2188 | uart_report_port(drv, port); |
| 2189 | |
George G. Davis | 3689a0e | 2007-02-14 00:33:06 -0800 | [diff] [blame] | 2190 | /* Power up port for set_mctrl() */ |
| 2191 | uart_change_pm(state, 0); |
| 2192 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2193 | /* |
| 2194 | * Ensure that the modem control lines are de-activated. |
Yinghai Lu | c3e4642 | 2008-02-04 22:27:46 -0800 | [diff] [blame] | 2195 | * keep the DTR setting that is set in uart_set_options() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2196 | * We probably don't need a spinlock around this, but |
| 2197 | */ |
| 2198 | spin_lock_irqsave(&port->lock, flags); |
Yinghai Lu | c3e4642 | 2008-02-04 22:27:46 -0800 | [diff] [blame] | 2199 | port->ops->set_mctrl(port, port->mctrl & TIOCM_DTR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2200 | spin_unlock_irqrestore(&port->lock, flags); |
| 2201 | |
| 2202 | /* |
Russell King | 97d9722 | 2007-09-01 21:25:09 +0100 | [diff] [blame] | 2203 | * If this driver supports console, and it hasn't been |
| 2204 | * successfully registered yet, try to re-register it. |
| 2205 | * It may be that the port was not available. |
| 2206 | */ |
| 2207 | if (port->cons && !(port->cons->flags & CON_ENABLED)) |
| 2208 | register_console(port->cons); |
| 2209 | |
| 2210 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2211 | * Power down all ports by default, except the |
| 2212 | * console if we have one. |
| 2213 | */ |
| 2214 | if (!uart_console(port)) |
| 2215 | uart_change_pm(state, 3); |
| 2216 | } |
| 2217 | } |
| 2218 | |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 2219 | #ifdef CONFIG_CONSOLE_POLL |
| 2220 | |
| 2221 | static int uart_poll_init(struct tty_driver *driver, int line, char *options) |
| 2222 | { |
| 2223 | struct uart_driver *drv = driver->driver_state; |
| 2224 | struct uart_state *state = drv->state + line; |
| 2225 | struct uart_port *port; |
| 2226 | int baud = 9600; |
| 2227 | int bits = 8; |
| 2228 | int parity = 'n'; |
| 2229 | int flow = 'n'; |
| 2230 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 2231 | if (!state || !state->uart_port) |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 2232 | return -1; |
| 2233 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 2234 | port = state->uart_port; |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 2235 | if (!(port->ops->poll_get_char && port->ops->poll_put_char)) |
| 2236 | return -1; |
| 2237 | |
| 2238 | if (options) { |
| 2239 | uart_parse_options(options, &baud, &parity, &bits, &flow); |
| 2240 | return uart_set_options(port, NULL, baud, parity, bits, flow); |
| 2241 | } |
| 2242 | |
| 2243 | return 0; |
| 2244 | } |
| 2245 | |
| 2246 | static int uart_poll_get_char(struct tty_driver *driver, int line) |
| 2247 | { |
| 2248 | struct uart_driver *drv = driver->driver_state; |
| 2249 | struct uart_state *state = drv->state + line; |
| 2250 | struct uart_port *port; |
| 2251 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 2252 | if (!state || !state->uart_port) |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 2253 | return -1; |
| 2254 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 2255 | port = state->uart_port; |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 2256 | return port->ops->poll_get_char(port); |
| 2257 | } |
| 2258 | |
| 2259 | static void uart_poll_put_char(struct tty_driver *driver, int line, char ch) |
| 2260 | { |
| 2261 | struct uart_driver *drv = driver->driver_state; |
| 2262 | struct uart_state *state = drv->state + line; |
| 2263 | struct uart_port *port; |
| 2264 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 2265 | if (!state || !state->uart_port) |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 2266 | return; |
| 2267 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 2268 | port = state->uart_port; |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 2269 | port->ops->poll_put_char(port, ch); |
| 2270 | } |
| 2271 | #endif |
| 2272 | |
Jeff Dike | b68e31d | 2006-10-02 02:17:18 -0700 | [diff] [blame] | 2273 | static const struct tty_operations uart_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2274 | .open = uart_open, |
| 2275 | .close = uart_close, |
| 2276 | .write = uart_write, |
| 2277 | .put_char = uart_put_char, |
| 2278 | .flush_chars = uart_flush_chars, |
| 2279 | .write_room = uart_write_room, |
| 2280 | .chars_in_buffer= uart_chars_in_buffer, |
| 2281 | .flush_buffer = uart_flush_buffer, |
| 2282 | .ioctl = uart_ioctl, |
| 2283 | .throttle = uart_throttle, |
| 2284 | .unthrottle = uart_unthrottle, |
| 2285 | .send_xchar = uart_send_xchar, |
| 2286 | .set_termios = uart_set_termios, |
Alan Cox | 64e9159 | 2008-06-03 15:18:54 +0100 | [diff] [blame] | 2287 | .set_ldisc = uart_set_ldisc, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2288 | .stop = uart_stop, |
| 2289 | .start = uart_start, |
| 2290 | .hangup = uart_hangup, |
| 2291 | .break_ctl = uart_break_ctl, |
| 2292 | .wait_until_sent= uart_wait_until_sent, |
| 2293 | #ifdef CONFIG_PROC_FS |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 2294 | .proc_fops = &uart_proc_fops, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2295 | #endif |
| 2296 | .tiocmget = uart_tiocmget, |
| 2297 | .tiocmset = uart_tiocmset, |
Alan Cox | d281da7 | 2010-09-16 18:21:24 +0100 | [diff] [blame] | 2298 | .get_icount = uart_get_icount, |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 2299 | #ifdef CONFIG_CONSOLE_POLL |
| 2300 | .poll_init = uart_poll_init, |
| 2301 | .poll_get_char = uart_poll_get_char, |
| 2302 | .poll_put_char = uart_poll_put_char, |
| 2303 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2304 | }; |
| 2305 | |
Alan Cox | de0c8cb | 2010-06-01 22:52:58 +0200 | [diff] [blame] | 2306 | static const struct tty_port_operations uart_port_ops = { |
| 2307 | .carrier_raised = uart_carrier_raised, |
| 2308 | .dtr_rts = uart_dtr_rts, |
| 2309 | }; |
| 2310 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2311 | /** |
| 2312 | * uart_register_driver - register a driver with the uart core layer |
| 2313 | * @drv: low level driver structure |
| 2314 | * |
| 2315 | * Register a uart driver with the core driver. We in turn register |
| 2316 | * with the tty layer, and initialise the core driver per-port state. |
| 2317 | * |
| 2318 | * We have a proc file in /proc/tty/driver which is named after the |
| 2319 | * normal driver. |
| 2320 | * |
| 2321 | * drv->port should be NULL, and the per-port structures should be |
| 2322 | * registered using uart_add_one_port after this call has succeeded. |
| 2323 | */ |
| 2324 | int uart_register_driver(struct uart_driver *drv) |
| 2325 | { |
André Goddard Rosa | 9e845ab | 2009-10-25 11:16:32 -0200 | [diff] [blame] | 2326 | struct tty_driver *normal; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2327 | int i, retval; |
| 2328 | |
| 2329 | BUG_ON(drv->state); |
| 2330 | |
| 2331 | /* |
| 2332 | * Maybe we should be using a slab cache for this, especially if |
| 2333 | * we have a large number of ports to handle. |
| 2334 | */ |
Burman Yan | 8f31bb3 | 2007-02-14 00:33:07 -0800 | [diff] [blame] | 2335 | drv->state = kzalloc(sizeof(struct uart_state) * drv->nr, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2336 | if (!drv->state) |
| 2337 | goto out; |
| 2338 | |
André Goddard Rosa | 9e845ab | 2009-10-25 11:16:32 -0200 | [diff] [blame] | 2339 | normal = alloc_tty_driver(drv->nr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2340 | if (!normal) |
André Goddard Rosa | 9e845ab | 2009-10-25 11:16:32 -0200 | [diff] [blame] | 2341 | goto out_kfree; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2342 | |
| 2343 | drv->tty_driver = normal; |
| 2344 | |
| 2345 | normal->owner = drv->owner; |
| 2346 | normal->driver_name = drv->driver_name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2347 | normal->name = drv->dev_name; |
| 2348 | normal->major = drv->major; |
| 2349 | normal->minor_start = drv->minor; |
| 2350 | normal->type = TTY_DRIVER_TYPE_SERIAL; |
| 2351 | normal->subtype = SERIAL_TYPE_NORMAL; |
| 2352 | normal->init_termios = tty_std_termios; |
| 2353 | normal->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 2354 | normal->init_termios.c_ispeed = normal->init_termios.c_ospeed = 9600; |
Greg Kroah-Hartman | 331b831 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 2355 | normal->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2356 | normal->driver_state = drv; |
| 2357 | tty_set_operations(normal, &uart_ops); |
| 2358 | |
| 2359 | /* |
| 2360 | * Initialise the UART state(s). |
| 2361 | */ |
| 2362 | for (i = 0; i < drv->nr; i++) { |
| 2363 | struct uart_state *state = drv->state + i; |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2364 | struct tty_port *port = &state->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2365 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2366 | tty_port_init(port); |
Alan Cox | de0c8cb | 2010-06-01 22:52:58 +0200 | [diff] [blame] | 2367 | port->ops = &uart_port_ops; |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2368 | port->close_delay = 500; /* .5 seconds */ |
| 2369 | port->closing_wait = 30000; /* 30 seconds */ |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 2370 | tasklet_init(&state->tlet, uart_tasklet_action, |
Alan Cox | f751928 | 2009-01-02 13:49:21 +0000 | [diff] [blame] | 2371 | (unsigned long)state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2372 | } |
| 2373 | |
| 2374 | retval = tty_register_driver(normal); |
André Goddard Rosa | 9e845ab | 2009-10-25 11:16:32 -0200 | [diff] [blame] | 2375 | if (retval >= 0) |
| 2376 | return retval; |
| 2377 | |
| 2378 | put_tty_driver(normal); |
| 2379 | out_kfree: |
| 2380 | kfree(drv->state); |
| 2381 | out: |
| 2382 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2383 | } |
| 2384 | |
| 2385 | /** |
| 2386 | * uart_unregister_driver - remove a driver from the uart core layer |
| 2387 | * @drv: low level driver structure |
| 2388 | * |
| 2389 | * Remove all references to a driver from the core driver. The low |
| 2390 | * level driver must have removed all its ports via the |
| 2391 | * uart_remove_one_port() if it registered them with uart_add_one_port(). |
| 2392 | * (ie, drv->port == NULL) |
| 2393 | */ |
| 2394 | void uart_unregister_driver(struct uart_driver *drv) |
| 2395 | { |
| 2396 | struct tty_driver *p = drv->tty_driver; |
| 2397 | tty_unregister_driver(p); |
| 2398 | put_tty_driver(p); |
| 2399 | kfree(drv->state); |
| 2400 | drv->tty_driver = NULL; |
| 2401 | } |
| 2402 | |
| 2403 | struct tty_driver *uart_console_device(struct console *co, int *index) |
| 2404 | { |
| 2405 | struct uart_driver *p = co->data; |
| 2406 | *index = co->index; |
| 2407 | return p->tty_driver; |
| 2408 | } |
| 2409 | |
| 2410 | /** |
| 2411 | * uart_add_one_port - attach a driver-defined port structure |
| 2412 | * @drv: pointer to the uart low level driver structure for this port |
Randy Dunlap | 1b9894f | 2009-09-21 11:12:03 -0700 | [diff] [blame] | 2413 | * @uport: uart port structure to use for this port. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2414 | * |
| 2415 | * This allows the driver to register its own uart_port structure |
| 2416 | * with the core driver. The main purpose is to allow the low |
| 2417 | * level uart drivers to expand uart_port, rather than having yet |
| 2418 | * more levels of structures. |
| 2419 | */ |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2420 | int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2421 | { |
| 2422 | struct uart_state *state; |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2423 | struct tty_port *port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2424 | int ret = 0; |
Guennadi Liakhovetski | b3b708f | 2007-10-16 01:24:02 -0700 | [diff] [blame] | 2425 | struct device *tty_dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2426 | |
| 2427 | BUG_ON(in_interrupt()); |
| 2428 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2429 | if (uport->line >= drv->nr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2430 | return -EINVAL; |
| 2431 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2432 | state = drv->state + uport->line; |
| 2433 | port = &state->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2434 | |
Arjan van de Ven | f392ecf | 2006-01-12 18:44:32 +0000 | [diff] [blame] | 2435 | mutex_lock(&port_mutex); |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2436 | mutex_lock(&port->mutex); |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 2437 | if (state->uart_port) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2438 | ret = -EINVAL; |
| 2439 | goto out; |
| 2440 | } |
| 2441 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2442 | state->uart_port = uport; |
Russell King | 97d9722 | 2007-09-01 21:25:09 +0100 | [diff] [blame] | 2443 | state->pm_state = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2444 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2445 | uport->cons = drv->cons; |
| 2446 | uport->state = state; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2447 | |
Russell King | 976ecd1 | 2005-07-03 21:05:45 +0100 | [diff] [blame] | 2448 | /* |
| 2449 | * If this port is a console, then the spinlock is already |
| 2450 | * initialised. |
| 2451 | */ |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2452 | if (!(uart_console(uport) && (uport->cons->flags & CON_ENABLED))) { |
| 2453 | spin_lock_init(&uport->lock); |
| 2454 | lockdep_set_class(&uport->lock, &port_lock_key); |
Ingo Molnar | 13e8359 | 2006-07-03 00:25:03 -0700 | [diff] [blame] | 2455 | } |
Russell King | 976ecd1 | 2005-07-03 21:05:45 +0100 | [diff] [blame] | 2456 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2457 | uart_configure_port(drv, state, uport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2458 | |
| 2459 | /* |
| 2460 | * Register the port whether it's detected or not. This allows |
| 2461 | * setserial to be used to alter this ports parameters. |
| 2462 | */ |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2463 | tty_dev = tty_register_device(drv->tty_driver, uport->line, uport->dev); |
Guennadi Liakhovetski | b3b708f | 2007-10-16 01:24:02 -0700 | [diff] [blame] | 2464 | if (likely(!IS_ERR(tty_dev))) { |
Alan Stern | 74081f8 | 2008-03-19 22:35:13 +0100 | [diff] [blame] | 2465 | device_init_wakeup(tty_dev, 1); |
Guennadi Liakhovetski | b3b708f | 2007-10-16 01:24:02 -0700 | [diff] [blame] | 2466 | device_set_wakeup_enable(tty_dev, 0); |
| 2467 | } else |
| 2468 | printk(KERN_ERR "Cannot register tty device on line %d\n", |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2469 | uport->line); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2470 | |
| 2471 | /* |
Russell King | 68ac64c | 2006-04-30 11:13:50 +0100 | [diff] [blame] | 2472 | * Ensure UPF_DEAD is not set. |
| 2473 | */ |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2474 | uport->flags &= ~UPF_DEAD; |
Russell King | 68ac64c | 2006-04-30 11:13:50 +0100 | [diff] [blame] | 2475 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2476 | out: |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2477 | mutex_unlock(&port->mutex); |
Arjan van de Ven | f392ecf | 2006-01-12 18:44:32 +0000 | [diff] [blame] | 2478 | mutex_unlock(&port_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2479 | |
| 2480 | return ret; |
| 2481 | } |
| 2482 | |
| 2483 | /** |
| 2484 | * uart_remove_one_port - detach a driver defined port structure |
| 2485 | * @drv: pointer to the uart low level driver structure for this port |
Randy Dunlap | 1b9894f | 2009-09-21 11:12:03 -0700 | [diff] [blame] | 2486 | * @uport: uart port structure for this port |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2487 | * |
| 2488 | * This unhooks (and hangs up) the specified port structure from the |
| 2489 | * core driver. No further calls will be made to the low-level code |
| 2490 | * for this port. |
| 2491 | */ |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2492 | int uart_remove_one_port(struct uart_driver *drv, struct uart_port *uport) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2493 | { |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2494 | struct uart_state *state = drv->state + uport->line; |
| 2495 | struct tty_port *port = &state->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2496 | |
| 2497 | BUG_ON(in_interrupt()); |
| 2498 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2499 | if (state->uart_port != uport) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2500 | printk(KERN_ALERT "Removing wrong port: %p != %p\n", |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2501 | state->uart_port, uport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2502 | |
Arjan van de Ven | f392ecf | 2006-01-12 18:44:32 +0000 | [diff] [blame] | 2503 | mutex_lock(&port_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2504 | |
| 2505 | /* |
Russell King | 68ac64c | 2006-04-30 11:13:50 +0100 | [diff] [blame] | 2506 | * Mark the port "dead" - this prevents any opens from |
| 2507 | * succeeding while we shut down the port. |
| 2508 | */ |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2509 | mutex_lock(&port->mutex); |
| 2510 | uport->flags |= UPF_DEAD; |
| 2511 | mutex_unlock(&port->mutex); |
Russell King | 68ac64c | 2006-04-30 11:13:50 +0100 | [diff] [blame] | 2512 | |
| 2513 | /* |
Greg Kroah-Hartman | aa4148c | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 2514 | * Remove the devices from the tty layer |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2515 | */ |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2516 | tty_unregister_device(drv->tty_driver, uport->line); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2517 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2518 | if (port->tty) |
| 2519 | tty_vhangup(port->tty); |
Russell King | 68ac64c | 2006-04-30 11:13:50 +0100 | [diff] [blame] | 2520 | |
| 2521 | /* |
Russell King | 68ac64c | 2006-04-30 11:13:50 +0100 | [diff] [blame] | 2522 | * Free the port IO and memory resources, if any. |
| 2523 | */ |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2524 | if (uport->type != PORT_UNKNOWN) |
| 2525 | uport->ops->release_port(uport); |
Russell King | 68ac64c | 2006-04-30 11:13:50 +0100 | [diff] [blame] | 2526 | |
| 2527 | /* |
| 2528 | * Indicate that there isn't a port here anymore. |
| 2529 | */ |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2530 | uport->type = PORT_UNKNOWN; |
Russell King | 68ac64c | 2006-04-30 11:13:50 +0100 | [diff] [blame] | 2531 | |
| 2532 | /* |
| 2533 | * Kill the tasklet, and free resources. |
| 2534 | */ |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 2535 | tasklet_kill(&state->tlet); |
Russell King | 68ac64c | 2006-04-30 11:13:50 +0100 | [diff] [blame] | 2536 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 2537 | state->uart_port = NULL; |
Arjan van de Ven | f392ecf | 2006-01-12 18:44:32 +0000 | [diff] [blame] | 2538 | mutex_unlock(&port_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2539 | |
| 2540 | return 0; |
| 2541 | } |
| 2542 | |
| 2543 | /* |
| 2544 | * Are the two ports equivalent? |
| 2545 | */ |
| 2546 | int uart_match_port(struct uart_port *port1, struct uart_port *port2) |
| 2547 | { |
| 2548 | if (port1->iotype != port2->iotype) |
| 2549 | return 0; |
| 2550 | |
| 2551 | switch (port1->iotype) { |
| 2552 | case UPIO_PORT: |
| 2553 | return (port1->iobase == port2->iobase); |
| 2554 | case UPIO_HUB6: |
| 2555 | return (port1->iobase == port2->iobase) && |
| 2556 | (port1->hub6 == port2->hub6); |
| 2557 | case UPIO_MEM: |
Sergei Shtylyov | d21b55d | 2006-08-28 19:49:03 +0400 | [diff] [blame] | 2558 | case UPIO_MEM32: |
| 2559 | case UPIO_AU: |
| 2560 | case UPIO_TSI: |
Marc St-Jean | beab697 | 2007-05-06 14:48:45 -0700 | [diff] [blame] | 2561 | case UPIO_DWAPB: |
Jamie Iles | a3ae0fc | 2010-12-01 23:39:36 +0000 | [diff] [blame] | 2562 | case UPIO_DWAPB32: |
Benjamin Herrenschmidt | 1624f00 | 2006-01-04 18:09:44 +0000 | [diff] [blame] | 2563 | return (port1->mapbase == port2->mapbase); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2564 | } |
| 2565 | return 0; |
| 2566 | } |
| 2567 | EXPORT_SYMBOL(uart_match_port); |
| 2568 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2569 | EXPORT_SYMBOL(uart_write_wakeup); |
| 2570 | EXPORT_SYMBOL(uart_register_driver); |
| 2571 | EXPORT_SYMBOL(uart_unregister_driver); |
| 2572 | EXPORT_SYMBOL(uart_suspend_port); |
| 2573 | EXPORT_SYMBOL(uart_resume_port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2574 | EXPORT_SYMBOL(uart_add_one_port); |
| 2575 | EXPORT_SYMBOL(uart_remove_one_port); |
| 2576 | |
| 2577 | MODULE_DESCRIPTION("Serial driver core"); |
| 2578 | MODULE_LICENSE("GPL"); |