Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * Driver core for serial ports |
| 3 | * |
| 4 | * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. |
| 5 | * |
| 6 | * Copyright 1999 ARM Limited |
| 7 | * Copyright (C) 2000-2001 Deep Blue Solutions Ltd. |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License as published by |
| 11 | * the Free Software Foundation; either version 2 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License |
| 20 | * along with this program; if not, write to the Free Software |
| 21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 22 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include <linux/module.h> |
| 24 | #include <linux/tty.h> |
| 25 | #include <linux/slab.h> |
| 26 | #include <linux/init.h> |
| 27 | #include <linux/console.h> |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 28 | #include <linux/proc_fs.h> |
| 29 | #include <linux/seq_file.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include <linux/device.h> |
| 31 | #include <linux/serial.h> /* for serial_state and serial_icounter_struct */ |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 32 | #include <linux/serial_core.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #include <linux/delay.h> |
Arjan van de Ven | f392ecf | 2006-01-12 18:44:32 +0000 | [diff] [blame] | 34 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | |
| 36 | #include <asm/irq.h> |
| 37 | #include <asm/uaccess.h> |
| 38 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | /* |
| 40 | * This is used to lock changes in serial line configuration. |
| 41 | */ |
Arjan van de Ven | f392ecf | 2006-01-12 18:44:32 +0000 | [diff] [blame] | 42 | static DEFINE_MUTEX(port_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | |
Ingo Molnar | 13e8359 | 2006-07-03 00:25:03 -0700 | [diff] [blame] | 44 | /* |
| 45 | * lockdep: port->lock is initialized in two places, but we |
| 46 | * want only one lock-class: |
| 47 | */ |
| 48 | static struct lock_class_key port_lock_key; |
| 49 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | #define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8) |
| 51 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | #ifdef CONFIG_SERIAL_CORE_CONSOLE |
| 53 | #define uart_console(port) ((port)->cons && (port)->cons->index == (port)->line) |
| 54 | #else |
| 55 | #define uart_console(port) (0) |
| 56 | #endif |
| 57 | |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 58 | 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] | 59 | struct ktermios *old_termios); |
Jiri Slaby | 1f33a51 | 2011-07-14 14:35:10 +0200 | [diff] [blame] | 60 | static void uart_wait_until_sent(struct tty_struct *tty, int timeout); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | static void uart_change_pm(struct uart_state *state, int pm_state); |
| 62 | |
| 63 | /* |
| 64 | * This routine is used by the interrupt handler to schedule processing in |
| 65 | * the software interrupt portion of the driver. |
| 66 | */ |
| 67 | void uart_write_wakeup(struct uart_port *port) |
| 68 | { |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 69 | struct uart_state *state = port->state; |
Pavel Machek | d5f735e | 2006-03-07 21:55:20 -0800 | [diff] [blame] | 70 | /* |
| 71 | * This means you called this function _after_ the port was |
| 72 | * closed. No cookie for you. |
| 73 | */ |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 74 | BUG_ON(!state); |
Jiri Slaby | 6a3e492b | 2011-07-14 14:35:12 +0200 | [diff] [blame] | 75 | tty_wakeup(state->port.tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | } |
| 77 | |
| 78 | static void uart_stop(struct tty_struct *tty) |
| 79 | { |
| 80 | struct uart_state *state = tty->driver_data; |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 81 | struct uart_port *port = state->uart_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | unsigned long flags; |
| 83 | |
| 84 | spin_lock_irqsave(&port->lock, flags); |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 85 | port->ops->stop_tx(port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | spin_unlock_irqrestore(&port->lock, flags); |
| 87 | } |
| 88 | |
| 89 | static void __uart_start(struct tty_struct *tty) |
| 90 | { |
| 91 | struct uart_state *state = tty->driver_data; |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 92 | struct uart_port *port = state->uart_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 94 | if (!uart_circ_empty(&state->xmit) && state->xmit.buf && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | !tty->stopped && !tty->hw_stopped) |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 96 | port->ops->start_tx(port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | } |
| 98 | |
| 99 | static void uart_start(struct tty_struct *tty) |
| 100 | { |
| 101 | struct uart_state *state = tty->driver_data; |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 102 | struct uart_port *port = state->uart_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | unsigned long flags; |
| 104 | |
| 105 | spin_lock_irqsave(&port->lock, flags); |
| 106 | __uart_start(tty); |
| 107 | spin_unlock_irqrestore(&port->lock, flags); |
| 108 | } |
| 109 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | static inline void |
| 111 | uart_update_mctrl(struct uart_port *port, unsigned int set, unsigned int clear) |
| 112 | { |
| 113 | unsigned long flags; |
| 114 | unsigned int old; |
| 115 | |
| 116 | spin_lock_irqsave(&port->lock, flags); |
| 117 | old = port->mctrl; |
| 118 | port->mctrl = (old & ~clear) | set; |
| 119 | if (old != port->mctrl) |
| 120 | port->ops->set_mctrl(port, port->mctrl); |
| 121 | spin_unlock_irqrestore(&port->lock, flags); |
| 122 | } |
| 123 | |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 124 | #define uart_set_mctrl(port, set) uart_update_mctrl(port, set, 0) |
| 125 | #define uart_clear_mctrl(port, clear) uart_update_mctrl(port, 0, clear) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | |
| 127 | /* |
| 128 | * Startup the port. This will be called once per open. All calls |
Alan Cox | df4f4dd | 2008-07-16 21:53:50 +0100 | [diff] [blame] | 129 | * will be serialised by the per-port mutex. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | */ |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 131 | 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] | 132 | { |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 133 | struct uart_port *uport = state->uart_port; |
| 134 | struct tty_port *port = &state->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | unsigned long page; |
| 136 | int retval = 0; |
| 137 | |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 138 | if (port->flags & ASYNC_INITIALIZED) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | return 0; |
| 140 | |
| 141 | /* |
| 142 | * Set the TTY IO error marker - we will only clear this |
| 143 | * once we have successfully opened the port. Also set |
| 144 | * up the tty->alt_speed kludge |
| 145 | */ |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 146 | set_bit(TTY_IO_ERROR, &tty->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 148 | if (uport->type == PORT_UNKNOWN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | return 0; |
| 150 | |
| 151 | /* |
| 152 | * Initialise and allocate the transmit and temporary |
| 153 | * buffer. |
| 154 | */ |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 155 | if (!state->xmit.buf) { |
Alan Cox | df4f4dd | 2008-07-16 21:53:50 +0100 | [diff] [blame] | 156 | /* This is protected by the per port mutex */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | page = get_zeroed_page(GFP_KERNEL); |
| 158 | if (!page) |
| 159 | return -ENOMEM; |
| 160 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 161 | state->xmit.buf = (unsigned char *) page; |
| 162 | uart_circ_clear(&state->xmit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | } |
| 164 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 165 | retval = uport->ops->startup(uport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | if (retval == 0) { |
Jiri Slaby | c7d7abf | 2011-03-30 00:10:55 +0200 | [diff] [blame] | 167 | if (uart_console(uport) && uport->cons->cflag) { |
| 168 | tty->termios->c_cflag = uport->cons->cflag; |
| 169 | uport->cons->cflag = 0; |
| 170 | } |
| 171 | /* |
| 172 | * Initialise the hardware port settings. |
| 173 | */ |
| 174 | uart_change_speed(tty, state, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | |
Jiri Slaby | c7d7abf | 2011-03-30 00:10:55 +0200 | [diff] [blame] | 176 | if (init_hw) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | /* |
| 178 | * Setup the RTS and DTR signals once the |
| 179 | * port is open and ready to respond. |
| 180 | */ |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 181 | if (tty->termios->c_cflag & CBAUD) |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 182 | uart_set_mctrl(uport, TIOCM_RTS | TIOCM_DTR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | } |
| 184 | |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 185 | if (port->flags & ASYNC_CTS_FLOW) { |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 186 | spin_lock_irq(&uport->lock); |
| 187 | if (!(uport->ops->get_mctrl(uport) & TIOCM_CTS)) |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 188 | tty->hw_stopped = 1; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 189 | spin_unlock_irq(&uport->lock); |
Russell King | 0dd7a1a | 2005-06-29 18:40:53 +0100 | [diff] [blame] | 190 | } |
| 191 | |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 192 | set_bit(ASYNCB_INITIALIZED, &port->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 194 | clear_bit(TTY_IO_ERROR, &tty->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | } |
| 196 | |
| 197 | if (retval && capable(CAP_SYS_ADMIN)) |
| 198 | retval = 0; |
| 199 | |
| 200 | return retval; |
| 201 | } |
| 202 | |
| 203 | /* |
| 204 | * This routine will shutdown a serial port; interrupts are disabled, and |
| 205 | * DTR is dropped if the hangup on close termio flag is on. Calls to |
| 206 | * uart_shutdown are serialised by the per-port semaphore. |
| 207 | */ |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 208 | static void uart_shutdown(struct tty_struct *tty, struct uart_state *state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | { |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 210 | struct uart_port *uport = state->uart_port; |
Alan Cox | bdc04e3 | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 211 | struct tty_port *port = &state->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | |
Russell King | ee31b33 | 2005-11-13 15:28:51 +0000 | [diff] [blame] | 213 | /* |
| 214 | * Set the TTY IO error marker |
| 215 | */ |
Alan Cox | f751928 | 2009-01-02 13:49:21 +0000 | [diff] [blame] | 216 | if (tty) |
| 217 | set_bit(TTY_IO_ERROR, &tty->flags); |
Russell King | ee31b33 | 2005-11-13 15:28:51 +0000 | [diff] [blame] | 218 | |
Alan Cox | bdc04e3 | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 219 | if (test_and_clear_bit(ASYNCB_INITIALIZED, &port->flags)) { |
Russell King | ee31b33 | 2005-11-13 15:28:51 +0000 | [diff] [blame] | 220 | /* |
| 221 | * Turn off DTR and RTS early. |
| 222 | */ |
Alan Cox | f751928 | 2009-01-02 13:49:21 +0000 | [diff] [blame] | 223 | if (!tty || (tty->termios->c_cflag & HUPCL)) |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 224 | uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); |
Russell King | ee31b33 | 2005-11-13 15:28:51 +0000 | [diff] [blame] | 225 | |
| 226 | /* |
| 227 | * clear delta_msr_wait queue to avoid mem leaks: we may free |
| 228 | * the irq here so the queue might never be woken up. Note |
| 229 | * that we won't end up waiting on delta_msr_wait again since |
| 230 | * any outstanding file descriptors should be pointing at |
| 231 | * hung_up_tty_fops now. |
| 232 | */ |
Alan Cox | bdc04e3 | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 233 | wake_up_interruptible(&port->delta_msr_wait); |
Russell King | ee31b33 | 2005-11-13 15:28:51 +0000 | [diff] [blame] | 234 | |
| 235 | /* |
| 236 | * Free the IRQ and disable the port. |
| 237 | */ |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 238 | uport->ops->shutdown(uport); |
Russell King | ee31b33 | 2005-11-13 15:28:51 +0000 | [diff] [blame] | 239 | |
| 240 | /* |
| 241 | * Ensure that the IRQ handler isn't running on another CPU. |
| 242 | */ |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 243 | synchronize_irq(uport->irq); |
Russell King | ee31b33 | 2005-11-13 15:28:51 +0000 | [diff] [blame] | 244 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | |
| 246 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | * Free the transmit buffer page. |
| 248 | */ |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 249 | if (state->xmit.buf) { |
| 250 | free_page((unsigned long)state->xmit.buf); |
| 251 | state->xmit.buf = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | } |
| 254 | |
| 255 | /** |
| 256 | * uart_update_timeout - update per-port FIFO timeout. |
| 257 | * @port: uart_port structure describing the port |
| 258 | * @cflag: termios cflag value |
| 259 | * @baud: speed of the port |
| 260 | * |
| 261 | * Set the port FIFO timeout value. The @cflag value should |
| 262 | * reflect the actual hardware settings. |
| 263 | */ |
| 264 | void |
| 265 | uart_update_timeout(struct uart_port *port, unsigned int cflag, |
| 266 | unsigned int baud) |
| 267 | { |
| 268 | unsigned int bits; |
| 269 | |
| 270 | /* byte size and parity */ |
| 271 | switch (cflag & CSIZE) { |
| 272 | case CS5: |
| 273 | bits = 7; |
| 274 | break; |
| 275 | case CS6: |
| 276 | bits = 8; |
| 277 | break; |
| 278 | case CS7: |
| 279 | bits = 9; |
| 280 | break; |
| 281 | default: |
| 282 | bits = 10; |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 283 | break; /* CS8 */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | } |
| 285 | |
| 286 | if (cflag & CSTOPB) |
| 287 | bits++; |
| 288 | if (cflag & PARENB) |
| 289 | bits++; |
| 290 | |
| 291 | /* |
| 292 | * The total number of bits to be transmitted in the fifo. |
| 293 | */ |
| 294 | bits = bits * port->fifosize; |
| 295 | |
| 296 | /* |
| 297 | * Figure the timeout to send the above number of bits. |
| 298 | * Add .02 seconds of slop |
| 299 | */ |
| 300 | port->timeout = (HZ * bits) / baud + HZ/50; |
| 301 | } |
| 302 | |
| 303 | EXPORT_SYMBOL(uart_update_timeout); |
| 304 | |
| 305 | /** |
| 306 | * uart_get_baud_rate - return baud rate for a particular port |
| 307 | * @port: uart_port structure describing the port in question. |
| 308 | * @termios: desired termios settings. |
| 309 | * @old: old termios (or NULL) |
| 310 | * @min: minimum acceptable baud rate |
| 311 | * @max: maximum acceptable baud rate |
| 312 | * |
| 313 | * Decode the termios structure into a numeric baud rate, |
| 314 | * taking account of the magic 38400 baud rate (with spd_* |
| 315 | * flags), and mapping the %B0 rate to 9600 baud. |
| 316 | * |
| 317 | * If the new baud rate is invalid, try the old termios setting. |
| 318 | * If it's still invalid, we try 9600 baud. |
| 319 | * |
| 320 | * Update the @termios structure to reflect the baud rate |
Alan Cox | eb424fd | 2008-04-28 02:14:07 -0700 | [diff] [blame] | 321 | * we're actually going to be using. Don't do this for the case |
| 322 | * where B0 is requested ("hang up"). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | */ |
| 324 | unsigned int |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 325 | uart_get_baud_rate(struct uart_port *port, struct ktermios *termios, |
| 326 | struct ktermios *old, unsigned int min, unsigned int max) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | { |
| 328 | unsigned int try, baud, altbaud = 38400; |
Alan Cox | eb424fd | 2008-04-28 02:14:07 -0700 | [diff] [blame] | 329 | int hung_up = 0; |
Russell King | 0077d45 | 2006-01-21 23:03:28 +0000 | [diff] [blame] | 330 | upf_t flags = port->flags & UPF_SPD_MASK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | |
| 332 | if (flags == UPF_SPD_HI) |
| 333 | altbaud = 57600; |
André Goddard Rosa | 82cb7ba | 2009-10-25 11:18:26 -0200 | [diff] [blame] | 334 | else if (flags == UPF_SPD_VHI) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | altbaud = 115200; |
André Goddard Rosa | 82cb7ba | 2009-10-25 11:18:26 -0200 | [diff] [blame] | 336 | else if (flags == UPF_SPD_SHI) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | altbaud = 230400; |
André Goddard Rosa | 82cb7ba | 2009-10-25 11:18:26 -0200 | [diff] [blame] | 338 | else if (flags == UPF_SPD_WARP) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | altbaud = 460800; |
| 340 | |
| 341 | for (try = 0; try < 2; try++) { |
| 342 | baud = tty_termios_baud_rate(termios); |
| 343 | |
| 344 | /* |
| 345 | * The spd_hi, spd_vhi, spd_shi, spd_warp kludge... |
| 346 | * Die! Die! Die! |
| 347 | */ |
| 348 | if (baud == 38400) |
| 349 | baud = altbaud; |
| 350 | |
| 351 | /* |
| 352 | * Special case: B0 rate. |
| 353 | */ |
Alan Cox | eb424fd | 2008-04-28 02:14:07 -0700 | [diff] [blame] | 354 | if (baud == 0) { |
| 355 | hung_up = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | baud = 9600; |
Alan Cox | eb424fd | 2008-04-28 02:14:07 -0700 | [diff] [blame] | 357 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | |
| 359 | if (baud >= min && baud <= max) |
| 360 | return baud; |
| 361 | |
| 362 | /* |
| 363 | * Oops, the quotient was zero. Try again with |
| 364 | * the old baud rate if possible. |
| 365 | */ |
| 366 | termios->c_cflag &= ~CBAUD; |
| 367 | if (old) { |
Alan Cox | 6d4d67b | 2008-02-04 22:27:53 -0800 | [diff] [blame] | 368 | baud = tty_termios_baud_rate(old); |
Alan Cox | eb424fd | 2008-04-28 02:14:07 -0700 | [diff] [blame] | 369 | if (!hung_up) |
| 370 | tty_termios_encode_baud_rate(termios, |
| 371 | baud, baud); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | old = NULL; |
| 373 | continue; |
| 374 | } |
| 375 | |
| 376 | /* |
Alan Cox | 16ae2a8 | 2010-01-04 16:26:21 +0000 | [diff] [blame] | 377 | * As a last resort, if the range cannot be met then clip to |
| 378 | * the nearest chip supported rate. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | */ |
Alan Cox | 16ae2a8 | 2010-01-04 16:26:21 +0000 | [diff] [blame] | 380 | if (!hung_up) { |
| 381 | if (baud <= min) |
| 382 | tty_termios_encode_baud_rate(termios, |
| 383 | min + 1, min + 1); |
| 384 | else |
| 385 | tty_termios_encode_baud_rate(termios, |
| 386 | max - 1, max - 1); |
| 387 | } |
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 | /* Should never happen */ |
| 390 | WARN_ON(1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | return 0; |
| 392 | } |
| 393 | |
| 394 | EXPORT_SYMBOL(uart_get_baud_rate); |
| 395 | |
| 396 | /** |
| 397 | * uart_get_divisor - return uart clock divisor |
| 398 | * @port: uart_port structure describing the port. |
| 399 | * @baud: desired baud rate |
| 400 | * |
| 401 | * Calculate the uart clock divisor for the port. |
| 402 | */ |
| 403 | unsigned int |
| 404 | uart_get_divisor(struct uart_port *port, unsigned int baud) |
| 405 | { |
| 406 | unsigned int quot; |
| 407 | |
| 408 | /* |
| 409 | * Old custom speed handling. |
| 410 | */ |
| 411 | if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) |
| 412 | quot = port->custom_divisor; |
| 413 | else |
| 414 | quot = (port->uartclk + (8 * baud)) / (16 * baud); |
| 415 | |
| 416 | return quot; |
| 417 | } |
| 418 | |
| 419 | EXPORT_SYMBOL(uart_get_divisor); |
| 420 | |
Alan Cox | 23d22ce | 2008-04-30 00:54:11 -0700 | [diff] [blame] | 421 | /* FIXME: Consistent locking policy */ |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 422 | static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, |
| 423 | struct ktermios *old_termios) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | { |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 425 | struct tty_port *port = &state->port; |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 426 | struct uart_port *uport = state->uart_port; |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 427 | struct ktermios *termios; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | |
| 429 | /* |
| 430 | * If we have no tty, termios, or the port does not exist, |
| 431 | * then we can't set the parameters for this port. |
| 432 | */ |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 433 | if (!tty || !tty->termios || uport->type == PORT_UNKNOWN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | return; |
| 435 | |
| 436 | termios = tty->termios; |
| 437 | |
| 438 | /* |
| 439 | * Set flags based on termios cflag |
| 440 | */ |
| 441 | if (termios->c_cflag & CRTSCTS) |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 442 | set_bit(ASYNCB_CTS_FLOW, &port->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | else |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 444 | clear_bit(ASYNCB_CTS_FLOW, &port->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | |
| 446 | if (termios->c_cflag & CLOCAL) |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 447 | clear_bit(ASYNCB_CHECK_CD, &port->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | else |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 449 | set_bit(ASYNCB_CHECK_CD, &port->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 451 | uport->ops->set_termios(uport, termios, old_termios); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | } |
| 453 | |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 454 | static inline int __uart_put_char(struct uart_port *port, |
| 455 | struct circ_buf *circ, unsigned char c) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | { |
| 457 | unsigned long flags; |
Alan Cox | 23d22ce | 2008-04-30 00:54:11 -0700 | [diff] [blame] | 458 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | |
| 460 | if (!circ->buf) |
Alan Cox | 23d22ce | 2008-04-30 00:54:11 -0700 | [diff] [blame] | 461 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | |
| 463 | spin_lock_irqsave(&port->lock, flags); |
| 464 | if (uart_circ_chars_free(circ) != 0) { |
| 465 | circ->buf[circ->head] = c; |
| 466 | circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1); |
Alan Cox | 23d22ce | 2008-04-30 00:54:11 -0700 | [diff] [blame] | 467 | ret = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | } |
| 469 | spin_unlock_irqrestore(&port->lock, flags); |
Alan Cox | 23d22ce | 2008-04-30 00:54:11 -0700 | [diff] [blame] | 470 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | } |
| 472 | |
Alan Cox | 23d22ce | 2008-04-30 00:54:11 -0700 | [diff] [blame] | 473 | static int uart_put_char(struct tty_struct *tty, unsigned char ch) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | { |
| 475 | struct uart_state *state = tty->driver_data; |
| 476 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 477 | return __uart_put_char(state->uart_port, &state->xmit, ch); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | } |
| 479 | |
| 480 | static void uart_flush_chars(struct tty_struct *tty) |
| 481 | { |
| 482 | uart_start(tty); |
| 483 | } |
| 484 | |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 485 | static int uart_write(struct tty_struct *tty, |
| 486 | const unsigned char *buf, int count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | { |
| 488 | struct uart_state *state = tty->driver_data; |
Pavel Machek | d5f735e | 2006-03-07 21:55:20 -0800 | [diff] [blame] | 489 | struct uart_port *port; |
| 490 | struct circ_buf *circ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | unsigned long flags; |
| 492 | int c, ret = 0; |
| 493 | |
Pavel Machek | d5f735e | 2006-03-07 21:55:20 -0800 | [diff] [blame] | 494 | /* |
| 495 | * This means you called this function _after_ the port was |
| 496 | * closed. No cookie for you. |
| 497 | */ |
Alan Cox | f751928 | 2009-01-02 13:49:21 +0000 | [diff] [blame] | 498 | if (!state) { |
Pavel Machek | d5f735e | 2006-03-07 21:55:20 -0800 | [diff] [blame] | 499 | WARN_ON(1); |
| 500 | return -EL3HLT; |
| 501 | } |
| 502 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 503 | port = state->uart_port; |
| 504 | circ = &state->xmit; |
Pavel Machek | d5f735e | 2006-03-07 21:55:20 -0800 | [diff] [blame] | 505 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | if (!circ->buf) |
| 507 | return 0; |
| 508 | |
| 509 | spin_lock_irqsave(&port->lock, flags); |
| 510 | while (1) { |
| 511 | c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE); |
| 512 | if (count < c) |
| 513 | c = count; |
| 514 | if (c <= 0) |
| 515 | break; |
| 516 | memcpy(circ->buf + circ->head, buf, c); |
| 517 | circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1); |
| 518 | buf += c; |
| 519 | count -= c; |
| 520 | ret += c; |
| 521 | } |
| 522 | spin_unlock_irqrestore(&port->lock, flags); |
| 523 | |
| 524 | uart_start(tty); |
| 525 | return ret; |
| 526 | } |
| 527 | |
| 528 | static int uart_write_room(struct tty_struct *tty) |
| 529 | { |
| 530 | struct uart_state *state = tty->driver_data; |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 531 | unsigned long flags; |
| 532 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 534 | spin_lock_irqsave(&state->uart_port->lock, flags); |
| 535 | ret = uart_circ_chars_free(&state->xmit); |
| 536 | spin_unlock_irqrestore(&state->uart_port->lock, flags); |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 537 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | } |
| 539 | |
| 540 | static int uart_chars_in_buffer(struct tty_struct *tty) |
| 541 | { |
| 542 | struct uart_state *state = tty->driver_data; |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 543 | unsigned long flags; |
| 544 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 546 | spin_lock_irqsave(&state->uart_port->lock, flags); |
| 547 | ret = uart_circ_chars_pending(&state->xmit); |
| 548 | spin_unlock_irqrestore(&state->uart_port->lock, flags); |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 549 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | } |
| 551 | |
| 552 | static void uart_flush_buffer(struct tty_struct *tty) |
| 553 | { |
| 554 | struct uart_state *state = tty->driver_data; |
Tetsuo Handa | 55d7b68 | 2008-05-06 20:42:27 -0700 | [diff] [blame] | 555 | struct uart_port *port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | unsigned long flags; |
| 557 | |
Pavel Machek | d5f735e | 2006-03-07 21:55:20 -0800 | [diff] [blame] | 558 | /* |
| 559 | * This means you called this function _after_ the port was |
| 560 | * closed. No cookie for you. |
| 561 | */ |
Alan Cox | f751928 | 2009-01-02 13:49:21 +0000 | [diff] [blame] | 562 | if (!state) { |
Pavel Machek | d5f735e | 2006-03-07 21:55:20 -0800 | [diff] [blame] | 563 | WARN_ON(1); |
| 564 | return; |
| 565 | } |
| 566 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 567 | port = state->uart_port; |
Jiri Slaby | eb3a1e1 | 2007-05-06 14:48:52 -0700 | [diff] [blame] | 568 | pr_debug("uart_flush_buffer(%d) called\n", tty->index); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | |
| 570 | spin_lock_irqsave(&port->lock, flags); |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 571 | uart_circ_clear(&state->xmit); |
Haavard Skinnemoen | 6bb0e3a | 2008-07-16 21:52:36 +0100 | [diff] [blame] | 572 | if (port->ops->flush_buffer) |
| 573 | port->ops->flush_buffer(port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | spin_unlock_irqrestore(&port->lock, flags); |
| 575 | tty_wakeup(tty); |
| 576 | } |
| 577 | |
| 578 | /* |
| 579 | * This function is used to send a high-priority XON/XOFF character to |
| 580 | * the device |
| 581 | */ |
| 582 | static void uart_send_xchar(struct tty_struct *tty, char ch) |
| 583 | { |
| 584 | struct uart_state *state = tty->driver_data; |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 585 | struct uart_port *port = state->uart_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | unsigned long flags; |
| 587 | |
| 588 | if (port->ops->send_xchar) |
| 589 | port->ops->send_xchar(port, ch); |
| 590 | else { |
| 591 | port->x_char = ch; |
| 592 | if (ch) { |
| 593 | spin_lock_irqsave(&port->lock, flags); |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 594 | port->ops->start_tx(port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | spin_unlock_irqrestore(&port->lock, flags); |
| 596 | } |
| 597 | } |
| 598 | } |
| 599 | |
| 600 | static void uart_throttle(struct tty_struct *tty) |
| 601 | { |
| 602 | struct uart_state *state = tty->driver_data; |
| 603 | |
| 604 | if (I_IXOFF(tty)) |
| 605 | uart_send_xchar(tty, STOP_CHAR(tty)); |
| 606 | |
| 607 | if (tty->termios->c_cflag & CRTSCTS) |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 608 | uart_clear_mctrl(state->uart_port, TIOCM_RTS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | } |
| 610 | |
| 611 | static void uart_unthrottle(struct tty_struct *tty) |
| 612 | { |
| 613 | struct uart_state *state = tty->driver_data; |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 614 | struct uart_port *port = state->uart_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | |
| 616 | if (I_IXOFF(tty)) { |
| 617 | if (port->x_char) |
| 618 | port->x_char = 0; |
| 619 | else |
| 620 | uart_send_xchar(tty, START_CHAR(tty)); |
| 621 | } |
| 622 | |
| 623 | if (tty->termios->c_cflag & CRTSCTS) |
| 624 | uart_set_mctrl(port, TIOCM_RTS); |
| 625 | } |
| 626 | |
| 627 | static int uart_get_info(struct uart_state *state, |
| 628 | struct serial_struct __user *retinfo) |
| 629 | { |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 630 | struct uart_port *uport = state->uart_port; |
| 631 | struct tty_port *port = &state->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | struct serial_struct tmp; |
| 633 | |
| 634 | memset(&tmp, 0, sizeof(tmp)); |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 635 | |
| 636 | /* Ensure the state we copy is consistent and no hardware changes |
| 637 | occur as we go */ |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 638 | mutex_lock(&port->mutex); |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 639 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 640 | tmp.type = uport->type; |
| 641 | tmp.line = uport->line; |
| 642 | tmp.port = uport->iobase; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | if (HIGH_BITS_OFFSET) |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 644 | tmp.port_high = (long) uport->iobase >> HIGH_BITS_OFFSET; |
| 645 | tmp.irq = uport->irq; |
| 646 | tmp.flags = uport->flags; |
| 647 | tmp.xmit_fifo_size = uport->fifosize; |
| 648 | tmp.baud_base = uport->uartclk / 16; |
| 649 | tmp.close_delay = port->close_delay / 10; |
Alan Cox | 016af53 | 2009-09-19 13:13:32 -0700 | [diff] [blame] | 650 | tmp.closing_wait = port->closing_wait == ASYNC_CLOSING_WAIT_NONE ? |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | ASYNC_CLOSING_WAIT_NONE : |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 652 | port->closing_wait / 10; |
| 653 | tmp.custom_divisor = uport->custom_divisor; |
| 654 | tmp.hub6 = uport->hub6; |
| 655 | tmp.io_type = uport->iotype; |
| 656 | tmp.iomem_reg_shift = uport->regshift; |
| 657 | tmp.iomem_base = (void *)(unsigned long)uport->mapbase; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 659 | mutex_unlock(&port->mutex); |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 660 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) |
| 662 | return -EFAULT; |
| 663 | return 0; |
| 664 | } |
| 665 | |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 666 | 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] | 667 | struct serial_struct __user *newinfo) |
| 668 | { |
| 669 | struct serial_struct new_serial; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 670 | struct uart_port *uport = state->uart_port; |
| 671 | struct tty_port *port = &state->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | unsigned long new_port; |
Russell King | 0077d45 | 2006-01-21 23:03:28 +0000 | [diff] [blame] | 673 | unsigned int change_irq, change_port, closing_wait; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | unsigned int old_custom_divisor, close_delay; |
Russell King | 0077d45 | 2006-01-21 23:03:28 +0000 | [diff] [blame] | 675 | upf_t old_flags, new_flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | int retval = 0; |
| 677 | |
| 678 | if (copy_from_user(&new_serial, newinfo, sizeof(new_serial))) |
| 679 | return -EFAULT; |
| 680 | |
| 681 | new_port = new_serial.port; |
| 682 | if (HIGH_BITS_OFFSET) |
| 683 | new_port += (unsigned long) new_serial.port_high << HIGH_BITS_OFFSET; |
| 684 | |
| 685 | new_serial.irq = irq_canonicalize(new_serial.irq); |
| 686 | close_delay = new_serial.close_delay * 10; |
| 687 | closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ? |
Alan Cox | 016af53 | 2009-09-19 13:13:32 -0700 | [diff] [blame] | 688 | ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | |
| 690 | /* |
Alan Cox | 91312cd | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 691 | * This semaphore protects port->count. It is also |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | * very useful to prevent opens. Also, take the |
| 693 | * port configuration semaphore to make sure that a |
| 694 | * module insertion/removal doesn't change anything |
| 695 | * under us. |
| 696 | */ |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 697 | mutex_lock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 699 | change_irq = !(uport->flags & UPF_FIXED_PORT) |
| 700 | && new_serial.irq != uport->irq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | |
| 702 | /* |
| 703 | * Since changing the 'type' of the port changes its resource |
| 704 | * allocations, we should treat type changes the same as |
| 705 | * IO port changes. |
| 706 | */ |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 707 | change_port = !(uport->flags & UPF_FIXED_PORT) |
| 708 | && (new_port != uport->iobase || |
| 709 | (unsigned long)new_serial.iomem_base != uport->mapbase || |
| 710 | new_serial.hub6 != uport->hub6 || |
| 711 | new_serial.io_type != uport->iotype || |
| 712 | new_serial.iomem_reg_shift != uport->regshift || |
| 713 | new_serial.type != uport->type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 715 | old_flags = uport->flags; |
Russell King | 0077d45 | 2006-01-21 23:03:28 +0000 | [diff] [blame] | 716 | new_flags = new_serial.flags; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 717 | old_custom_divisor = uport->custom_divisor; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | |
| 719 | if (!capable(CAP_SYS_ADMIN)) { |
| 720 | retval = -EPERM; |
| 721 | if (change_irq || change_port || |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 722 | (new_serial.baud_base != uport->uartclk / 16) || |
| 723 | (close_delay != port->close_delay) || |
| 724 | (closing_wait != port->closing_wait) || |
Russell King | 947deee | 2006-07-02 20:45:51 +0100 | [diff] [blame] | 725 | (new_serial.xmit_fifo_size && |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 726 | new_serial.xmit_fifo_size != uport->fifosize) || |
Russell King | 0077d45 | 2006-01-21 23:03:28 +0000 | [diff] [blame] | 727 | (((new_flags ^ old_flags) & ~UPF_USR_MASK) != 0)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | goto exit; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 729 | uport->flags = ((uport->flags & ~UPF_USR_MASK) | |
Russell King | 0077d45 | 2006-01-21 23:03:28 +0000 | [diff] [blame] | 730 | (new_flags & UPF_USR_MASK)); |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 731 | uport->custom_divisor = new_serial.custom_divisor; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | goto check_and_exit; |
| 733 | } |
| 734 | |
| 735 | /* |
| 736 | * Ask the low level driver to verify the settings. |
| 737 | */ |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 738 | if (uport->ops->verify_port) |
| 739 | retval = uport->ops->verify_port(uport, &new_serial); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | |
Yinghai Lu | a62c413 | 2008-08-19 20:49:55 -0700 | [diff] [blame] | 741 | if ((new_serial.irq >= nr_irqs) || (new_serial.irq < 0) || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | (new_serial.baud_base < 9600)) |
| 743 | retval = -EINVAL; |
| 744 | |
| 745 | if (retval) |
| 746 | goto exit; |
| 747 | |
| 748 | if (change_port || change_irq) { |
| 749 | retval = -EBUSY; |
| 750 | |
| 751 | /* |
| 752 | * Make sure that we are the sole user of this port. |
| 753 | */ |
Alan Cox | b58d13a | 2009-09-19 13:13:32 -0700 | [diff] [blame] | 754 | if (tty_port_users(port) > 1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 755 | goto exit; |
| 756 | |
| 757 | /* |
| 758 | * We need to shutdown the serial port at the old |
| 759 | * port/type/irq combination. |
| 760 | */ |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 761 | uart_shutdown(tty, state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | } |
| 763 | |
| 764 | if (change_port) { |
| 765 | unsigned long old_iobase, old_mapbase; |
| 766 | unsigned int old_type, old_iotype, old_hub6, old_shift; |
| 767 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 768 | old_iobase = uport->iobase; |
| 769 | old_mapbase = uport->mapbase; |
| 770 | old_type = uport->type; |
| 771 | old_hub6 = uport->hub6; |
| 772 | old_iotype = uport->iotype; |
| 773 | old_shift = uport->regshift; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | |
| 775 | /* |
| 776 | * Free and release old regions |
| 777 | */ |
| 778 | if (old_type != PORT_UNKNOWN) |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 779 | uport->ops->release_port(uport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 781 | uport->iobase = new_port; |
| 782 | uport->type = new_serial.type; |
| 783 | uport->hub6 = new_serial.hub6; |
| 784 | uport->iotype = new_serial.io_type; |
| 785 | uport->regshift = new_serial.iomem_reg_shift; |
| 786 | uport->mapbase = (unsigned long)new_serial.iomem_base; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | |
| 788 | /* |
| 789 | * Claim and map the new regions |
| 790 | */ |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 791 | if (uport->type != PORT_UNKNOWN) { |
| 792 | retval = uport->ops->request_port(uport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | } else { |
| 794 | /* Always success - Jean II */ |
| 795 | retval = 0; |
| 796 | } |
| 797 | |
| 798 | /* |
| 799 | * If we fail to request resources for the |
| 800 | * new port, try to restore the old settings. |
| 801 | */ |
| 802 | if (retval && old_type != PORT_UNKNOWN) { |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 803 | uport->iobase = old_iobase; |
| 804 | uport->type = old_type; |
| 805 | uport->hub6 = old_hub6; |
| 806 | uport->iotype = old_iotype; |
| 807 | uport->regshift = old_shift; |
| 808 | uport->mapbase = old_mapbase; |
| 809 | retval = uport->ops->request_port(uport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | /* |
| 811 | * If we failed to restore the old settings, |
| 812 | * we fail like this. |
| 813 | */ |
| 814 | if (retval) |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 815 | uport->type = PORT_UNKNOWN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 816 | |
| 817 | /* |
| 818 | * We failed anyway. |
| 819 | */ |
| 820 | retval = -EBUSY; |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 821 | /* Added to return the correct error -Ram Gupta */ |
| 822 | goto exit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 823 | } |
| 824 | } |
| 825 | |
David Gibson | abb4a23 | 2007-05-06 14:48:49 -0700 | [diff] [blame] | 826 | if (change_irq) |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 827 | uport->irq = new_serial.irq; |
| 828 | if (!(uport->flags & UPF_FIXED_PORT)) |
| 829 | uport->uartclk = new_serial.baud_base * 16; |
| 830 | uport->flags = (uport->flags & ~UPF_CHANGE_MASK) | |
Russell King | 0077d45 | 2006-01-21 23:03:28 +0000 | [diff] [blame] | 831 | (new_flags & UPF_CHANGE_MASK); |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 832 | uport->custom_divisor = new_serial.custom_divisor; |
| 833 | port->close_delay = close_delay; |
| 834 | port->closing_wait = closing_wait; |
Russell King | 947deee | 2006-07-02 20:45:51 +0100 | [diff] [blame] | 835 | if (new_serial.xmit_fifo_size) |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 836 | uport->fifosize = new_serial.xmit_fifo_size; |
| 837 | if (port->tty) |
| 838 | port->tty->low_latency = |
| 839 | (uport->flags & UPF_LOW_LATENCY) ? 1 : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | |
| 841 | check_and_exit: |
| 842 | retval = 0; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 843 | if (uport->type == PORT_UNKNOWN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | goto exit; |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 845 | if (port->flags & ASYNC_INITIALIZED) { |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 846 | if (((old_flags ^ uport->flags) & UPF_SPD_MASK) || |
| 847 | old_custom_divisor != uport->custom_divisor) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | /* |
| 849 | * If they're setting up a custom divisor or speed, |
| 850 | * instead of clearing it, then bitch about it. No |
| 851 | * need to rate-limit; it's CAP_SYS_ADMIN only. |
| 852 | */ |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 853 | if (uport->flags & UPF_SPD_MASK) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 854 | char buf[64]; |
| 855 | printk(KERN_NOTICE |
| 856 | "%s sets custom speed on %s. This " |
| 857 | "is deprecated.\n", current->comm, |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 858 | tty_name(port->tty, buf)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | } |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 860 | uart_change_speed(tty, state, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | } |
| 862 | } else |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 863 | retval = uart_startup(tty, state, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | exit: |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 865 | mutex_unlock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 866 | return retval; |
| 867 | } |
| 868 | |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 869 | /** |
| 870 | * uart_get_lsr_info - get line status register info |
| 871 | * @tty: tty associated with the UART |
| 872 | * @state: UART being queried |
| 873 | * @value: returned modem value |
| 874 | * |
| 875 | * Note: uart_ioctl protects us against hangups. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 876 | */ |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 877 | static int uart_get_lsr_info(struct tty_struct *tty, |
| 878 | struct uart_state *state, unsigned int __user *value) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | { |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 880 | struct uart_port *uport = state->uart_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 881 | unsigned int result; |
| 882 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 883 | result = uport->ops->tx_empty(uport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 884 | |
| 885 | /* |
| 886 | * If we're about to load something into the transmit |
| 887 | * register, we'll pretend the transmitter isn't empty to |
| 888 | * avoid a race condition (depending on when the transmit |
| 889 | * interrupt happens). |
| 890 | */ |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 891 | if (uport->x_char || |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 892 | ((uart_circ_chars_pending(&state->xmit) > 0) && |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 893 | !tty->stopped && !tty->hw_stopped)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 894 | result &= ~TIOCSER_TEMT; |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 895 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | return put_user(result, value); |
| 897 | } |
| 898 | |
Alan Cox | 60b33c1 | 2011-02-14 16:26:14 +0000 | [diff] [blame] | 899 | static int uart_tiocmget(struct tty_struct *tty) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | { |
| 901 | struct uart_state *state = tty->driver_data; |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 902 | struct tty_port *port = &state->port; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 903 | struct uart_port *uport = state->uart_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 904 | int result = -EIO; |
| 905 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 906 | mutex_lock(&port->mutex); |
Alan Cox | 60b33c1 | 2011-02-14 16:26:14 +0000 | [diff] [blame] | 907 | if (!(tty->flags & (1 << TTY_IO_ERROR))) { |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 908 | result = uport->mctrl; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 909 | spin_lock_irq(&uport->lock); |
| 910 | result |= uport->ops->get_mctrl(uport); |
| 911 | spin_unlock_irq(&uport->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | } |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 913 | mutex_unlock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | |
| 915 | return result; |
| 916 | } |
| 917 | |
| 918 | static int |
Alan Cox | 20b9d17 | 2011-02-14 16:26:50 +0000 | [diff] [blame] | 919 | uart_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 920 | { |
| 921 | struct uart_state *state = tty->driver_data; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 922 | struct uart_port *uport = state->uart_port; |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 923 | struct tty_port *port = &state->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | int ret = -EIO; |
| 925 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 926 | mutex_lock(&port->mutex); |
Alan Cox | 20b9d17 | 2011-02-14 16:26:50 +0000 | [diff] [blame] | 927 | if (!(tty->flags & (1 << TTY_IO_ERROR))) { |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 928 | uart_update_mctrl(uport, set, clear); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 929 | ret = 0; |
| 930 | } |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 931 | mutex_unlock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 932 | return ret; |
| 933 | } |
| 934 | |
Alan Cox | 9e98966 | 2008-07-22 11:18:03 +0100 | [diff] [blame] | 935 | static int uart_break_ctl(struct tty_struct *tty, int break_state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 936 | { |
| 937 | struct uart_state *state = tty->driver_data; |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 938 | struct tty_port *port = &state->port; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 939 | struct uart_port *uport = state->uart_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 940 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 941 | mutex_lock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 943 | if (uport->type != PORT_UNKNOWN) |
| 944 | uport->ops->break_ctl(uport, break_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 945 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 946 | mutex_unlock(&port->mutex); |
Alan Cox | 9e98966 | 2008-07-22 11:18:03 +0100 | [diff] [blame] | 947 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 948 | } |
| 949 | |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 950 | 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] | 951 | { |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 952 | struct uart_port *uport = state->uart_port; |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 953 | struct tty_port *port = &state->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | int flags, ret; |
| 955 | |
| 956 | if (!capable(CAP_SYS_ADMIN)) |
| 957 | return -EPERM; |
| 958 | |
| 959 | /* |
| 960 | * Take the per-port semaphore. This prevents count from |
| 961 | * changing, and hence any extra opens of the port while |
| 962 | * we're auto-configuring. |
| 963 | */ |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 964 | if (mutex_lock_interruptible(&port->mutex)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 965 | return -ERESTARTSYS; |
| 966 | |
| 967 | ret = -EBUSY; |
Alan Cox | b58d13a | 2009-09-19 13:13:32 -0700 | [diff] [blame] | 968 | if (tty_port_users(port) == 1) { |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 969 | uart_shutdown(tty, state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | |
| 971 | /* |
| 972 | * If we already have a port type configured, |
| 973 | * we must release its resources. |
| 974 | */ |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 975 | if (uport->type != PORT_UNKNOWN) |
| 976 | uport->ops->release_port(uport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 977 | |
| 978 | flags = UART_CONFIG_TYPE; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 979 | if (uport->flags & UPF_AUTO_IRQ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 980 | flags |= UART_CONFIG_IRQ; |
| 981 | |
| 982 | /* |
| 983 | * This will claim the ports resources if |
| 984 | * a port is found. |
| 985 | */ |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 986 | uport->ops->config_port(uport, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 987 | |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 988 | ret = uart_startup(tty, state, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 989 | } |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 990 | mutex_unlock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | return ret; |
| 992 | } |
| 993 | |
| 994 | /* |
| 995 | * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change |
| 996 | * - mask passed in arg for lines of interest |
| 997 | * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) |
| 998 | * Caller should use TIOCGICOUNT to see which one it was |
Alan Cox | bdc04e3 | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 999 | * |
| 1000 | * FIXME: This wants extracting into a common all driver implementation |
| 1001 | * of TIOCMWAIT using tty_port. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1002 | */ |
| 1003 | static int |
| 1004 | uart_wait_modem_status(struct uart_state *state, unsigned long arg) |
| 1005 | { |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1006 | struct uart_port *uport = state->uart_port; |
Alan Cox | bdc04e3 | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1007 | struct tty_port *port = &state->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1008 | DECLARE_WAITQUEUE(wait, current); |
| 1009 | struct uart_icount cprev, cnow; |
| 1010 | int ret; |
| 1011 | |
| 1012 | /* |
| 1013 | * note the counters on entry |
| 1014 | */ |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1015 | spin_lock_irq(&uport->lock); |
| 1016 | memcpy(&cprev, &uport->icount, sizeof(struct uart_icount)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1017 | |
| 1018 | /* |
| 1019 | * Force modem status interrupts on |
| 1020 | */ |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1021 | uport->ops->enable_ms(uport); |
| 1022 | spin_unlock_irq(&uport->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1023 | |
Alan Cox | bdc04e3 | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1024 | add_wait_queue(&port->delta_msr_wait, &wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1025 | for (;;) { |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1026 | spin_lock_irq(&uport->lock); |
| 1027 | memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); |
| 1028 | spin_unlock_irq(&uport->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1029 | |
| 1030 | set_current_state(TASK_INTERRUPTIBLE); |
| 1031 | |
| 1032 | if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || |
| 1033 | ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || |
| 1034 | ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || |
| 1035 | ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) { |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 1036 | ret = 0; |
| 1037 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1038 | } |
| 1039 | |
| 1040 | schedule(); |
| 1041 | |
| 1042 | /* see if a signal did it */ |
| 1043 | if (signal_pending(current)) { |
| 1044 | ret = -ERESTARTSYS; |
| 1045 | break; |
| 1046 | } |
| 1047 | |
| 1048 | cprev = cnow; |
| 1049 | } |
| 1050 | |
| 1051 | current->state = TASK_RUNNING; |
Alan Cox | bdc04e3 | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1052 | remove_wait_queue(&port->delta_msr_wait, &wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1053 | |
| 1054 | return ret; |
| 1055 | } |
| 1056 | |
| 1057 | /* |
| 1058 | * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) |
| 1059 | * Return: write counters to the user passed counter struct |
| 1060 | * NB: both 1->0 and 0->1 transitions are counted except for |
| 1061 | * RI where only 0->1 is counted. |
| 1062 | */ |
Alan Cox | d281da7 | 2010-09-16 18:21:24 +0100 | [diff] [blame] | 1063 | static int uart_get_icount(struct tty_struct *tty, |
| 1064 | struct serial_icounter_struct *icount) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1065 | { |
Alan Cox | d281da7 | 2010-09-16 18:21:24 +0100 | [diff] [blame] | 1066 | struct uart_state *state = tty->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1067 | struct uart_icount cnow; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1068 | struct uart_port *uport = state->uart_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1069 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1070 | spin_lock_irq(&uport->lock); |
| 1071 | memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); |
| 1072 | spin_unlock_irq(&uport->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1073 | |
Alan Cox | d281da7 | 2010-09-16 18:21:24 +0100 | [diff] [blame] | 1074 | icount->cts = cnow.cts; |
| 1075 | icount->dsr = cnow.dsr; |
| 1076 | icount->rng = cnow.rng; |
| 1077 | icount->dcd = cnow.dcd; |
| 1078 | icount->rx = cnow.rx; |
| 1079 | icount->tx = cnow.tx; |
| 1080 | icount->frame = cnow.frame; |
| 1081 | icount->overrun = cnow.overrun; |
| 1082 | icount->parity = cnow.parity; |
| 1083 | icount->brk = cnow.brk; |
| 1084 | icount->buf_overrun = cnow.buf_overrun; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1085 | |
Alan Cox | d281da7 | 2010-09-16 18:21:24 +0100 | [diff] [blame] | 1086 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1087 | } |
| 1088 | |
| 1089 | /* |
Alan Cox | e523844 | 2008-04-30 00:53:28 -0700 | [diff] [blame] | 1090 | * Called via sys_ioctl. We can use spin_lock_irq() here. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1091 | */ |
| 1092 | static int |
Alan Cox | 6caa76b | 2011-02-14 16:27:22 +0000 | [diff] [blame] | 1093 | uart_ioctl(struct tty_struct *tty, unsigned int cmd, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1094 | unsigned long arg) |
| 1095 | { |
| 1096 | struct uart_state *state = tty->driver_data; |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1097 | struct tty_port *port = &state->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1098 | void __user *uarg = (void __user *)arg; |
| 1099 | int ret = -ENOIOCTLCMD; |
| 1100 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1101 | |
| 1102 | /* |
| 1103 | * These ioctls don't rely on the hardware to be present. |
| 1104 | */ |
| 1105 | switch (cmd) { |
| 1106 | case TIOCGSERIAL: |
| 1107 | ret = uart_get_info(state, uarg); |
| 1108 | break; |
| 1109 | |
| 1110 | case TIOCSSERIAL: |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 1111 | ret = uart_set_info(tty, state, uarg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1112 | break; |
| 1113 | |
| 1114 | case TIOCSERCONFIG: |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 1115 | ret = uart_do_autoconfig(tty, state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1116 | break; |
| 1117 | |
| 1118 | case TIOCSERGWILD: /* obsolete */ |
| 1119 | case TIOCSERSWILD: /* obsolete */ |
| 1120 | ret = 0; |
| 1121 | break; |
| 1122 | } |
| 1123 | |
| 1124 | if (ret != -ENOIOCTLCMD) |
| 1125 | goto out; |
| 1126 | |
| 1127 | if (tty->flags & (1 << TTY_IO_ERROR)) { |
| 1128 | ret = -EIO; |
| 1129 | goto out; |
| 1130 | } |
| 1131 | |
| 1132 | /* |
| 1133 | * The following should only be used when hardware is present. |
| 1134 | */ |
| 1135 | switch (cmd) { |
| 1136 | case TIOCMIWAIT: |
| 1137 | ret = uart_wait_modem_status(state, arg); |
| 1138 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1139 | } |
| 1140 | |
| 1141 | if (ret != -ENOIOCTLCMD) |
| 1142 | goto out; |
| 1143 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1144 | mutex_lock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1145 | |
Alan Cox | 6caa76b | 2011-02-14 16:27:22 +0000 | [diff] [blame] | 1146 | if (tty->flags & (1 << TTY_IO_ERROR)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1147 | ret = -EIO; |
| 1148 | goto out_up; |
| 1149 | } |
| 1150 | |
| 1151 | /* |
| 1152 | * All these rely on hardware being present and need to be |
| 1153 | * protected against the tty being hung up. |
| 1154 | */ |
| 1155 | switch (cmd) { |
| 1156 | case TIOCSERGETLSR: /* Get line status register */ |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 1157 | ret = uart_get_lsr_info(tty, state, uarg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1158 | break; |
| 1159 | |
| 1160 | default: { |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1161 | struct uart_port *uport = state->uart_port; |
| 1162 | if (uport->ops->ioctl) |
| 1163 | ret = uport->ops->ioctl(uport, cmd, arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1164 | break; |
| 1165 | } |
| 1166 | } |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 1167 | out_up: |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1168 | mutex_unlock(&port->mutex); |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 1169 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1170 | return ret; |
| 1171 | } |
| 1172 | |
Linus Torvalds | edeb280 | 2008-06-04 10:35:03 -0700 | [diff] [blame] | 1173 | static void uart_set_ldisc(struct tty_struct *tty) |
Alan Cox | 64e9159 | 2008-06-03 15:18:54 +0100 | [diff] [blame] | 1174 | { |
| 1175 | struct uart_state *state = tty->driver_data; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1176 | struct uart_port *uport = state->uart_port; |
Alan Cox | 64e9159 | 2008-06-03 15:18:54 +0100 | [diff] [blame] | 1177 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1178 | if (uport->ops->set_ldisc) |
Alan Cox | d87d9b7 | 2010-06-01 22:52:53 +0200 | [diff] [blame] | 1179 | uport->ops->set_ldisc(uport, tty->termios->c_line); |
Alan Cox | 64e9159 | 2008-06-03 15:18:54 +0100 | [diff] [blame] | 1180 | } |
| 1181 | |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 1182 | static void uart_set_termios(struct tty_struct *tty, |
| 1183 | struct ktermios *old_termios) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1184 | { |
| 1185 | struct uart_state *state = tty->driver_data; |
| 1186 | unsigned long flags; |
| 1187 | unsigned int cflag = tty->termios->c_cflag; |
| 1188 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1189 | |
| 1190 | /* |
| 1191 | * These are the bits that are used to setup various |
David Woodhouse | 20620d6 | 2007-08-22 14:01:11 -0700 | [diff] [blame] | 1192 | * flags in the low level driver. We can ignore the Bfoo |
| 1193 | * bits in c_cflag; c_[io]speed will always be set |
| 1194 | * appropriately by set_termios() in tty_ioctl.c |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1195 | */ |
| 1196 | #define RELEVANT_IFLAG(iflag) ((iflag) & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1197 | if ((cflag ^ old_termios->c_cflag) == 0 && |
David Woodhouse | 20620d6 | 2007-08-22 14:01:11 -0700 | [diff] [blame] | 1198 | tty->termios->c_ospeed == old_termios->c_ospeed && |
| 1199 | tty->termios->c_ispeed == old_termios->c_ispeed && |
Alan Cox | e523844 | 2008-04-30 00:53:28 -0700 | [diff] [blame] | 1200 | RELEVANT_IFLAG(tty->termios->c_iflag ^ old_termios->c_iflag) == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1201 | return; |
Alan Cox | e523844 | 2008-04-30 00:53:28 -0700 | [diff] [blame] | 1202 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1203 | |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 1204 | uart_change_speed(tty, state, old_termios); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1205 | |
| 1206 | /* Handle transition to B0 status */ |
| 1207 | if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1208 | uart_clear_mctrl(state->uart_port, TIOCM_RTS | TIOCM_DTR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1209 | /* Handle transition away from B0 status */ |
André Goddard Rosa | 82cb7ba | 2009-10-25 11:18:26 -0200 | [diff] [blame] | 1210 | else if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1211 | unsigned int mask = TIOCM_DTR; |
| 1212 | if (!(cflag & CRTSCTS) || |
| 1213 | !test_bit(TTY_THROTTLED, &tty->flags)) |
| 1214 | mask |= TIOCM_RTS; |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1215 | uart_set_mctrl(state->uart_port, mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1216 | } |
| 1217 | |
| 1218 | /* Handle turning off CRTSCTS */ |
| 1219 | if ((old_termios->c_cflag & CRTSCTS) && !(cflag & CRTSCTS)) { |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1220 | spin_lock_irqsave(&state->uart_port->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1221 | tty->hw_stopped = 0; |
| 1222 | __uart_start(tty); |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1223 | spin_unlock_irqrestore(&state->uart_port->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1224 | } |
Russell King | 0dd7a1a | 2005-06-29 18:40:53 +0100 | [diff] [blame] | 1225 | /* Handle turning on CRTSCTS */ |
André Goddard Rosa | 82cb7ba | 2009-10-25 11:18:26 -0200 | [diff] [blame] | 1226 | else if (!(old_termios->c_cflag & CRTSCTS) && (cflag & CRTSCTS)) { |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1227 | spin_lock_irqsave(&state->uart_port->lock, flags); |
| 1228 | if (!(state->uart_port->ops->get_mctrl(state->uart_port) & TIOCM_CTS)) { |
Russell King | 0dd7a1a | 2005-06-29 18:40:53 +0100 | [diff] [blame] | 1229 | tty->hw_stopped = 1; |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1230 | state->uart_port->ops->stop_tx(state->uart_port); |
Russell King | 0dd7a1a | 2005-06-29 18:40:53 +0100 | [diff] [blame] | 1231 | } |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1232 | spin_unlock_irqrestore(&state->uart_port->lock, flags); |
Russell King | 0dd7a1a | 2005-06-29 18:40:53 +0100 | [diff] [blame] | 1233 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1234 | } |
| 1235 | |
| 1236 | /* |
| 1237 | * In 2.4.5, calls to this will be serialized via the BKL in |
| 1238 | * linux/drivers/char/tty_io.c:tty_release() |
| 1239 | * linux/drivers/char/tty_io.c:do_tty_handup() |
| 1240 | */ |
| 1241 | static void uart_close(struct tty_struct *tty, struct file *filp) |
| 1242 | { |
| 1243 | struct uart_state *state = tty->driver_data; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1244 | struct tty_port *port; |
| 1245 | struct uart_port *uport; |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1246 | unsigned long flags; |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 1247 | |
Linus Torvalds | eea7e17 | 2009-10-12 19:13:54 +0200 | [diff] [blame] | 1248 | if (!state) |
| 1249 | return; |
| 1250 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1251 | uport = state->uart_port; |
| 1252 | port = &state->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1253 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1254 | pr_debug("uart_close(%d) called\n", uport->line); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1255 | |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1256 | spin_lock_irqsave(&port->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1257 | |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1258 | if (tty_hung_up_p(filp)) { |
| 1259 | spin_unlock_irqrestore(&port->lock, flags); |
Nobuhiro Iwamatsu | 5595621 | 2011-08-29 15:43:36 +0900 | [diff] [blame^] | 1260 | return; |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1261 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1262 | |
Alan Cox | 91312cd | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1263 | if ((tty->count == 1) && (port->count != 1)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1264 | /* |
| 1265 | * Uh, oh. tty->count is 1, which means that the tty |
Alan Cox | 91312cd | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1266 | * structure will be freed. port->count should always |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1267 | * be one in these conditions. If it's greater than |
| 1268 | * one, we've got real problems, since it means the |
| 1269 | * serial port won't be shutdown. |
| 1270 | */ |
| 1271 | 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] | 1272 | "port->count is %d\n", port->count); |
| 1273 | port->count = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1274 | } |
Alan Cox | 91312cd | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1275 | if (--port->count < 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1276 | 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] | 1277 | tty->name, port->count); |
| 1278 | port->count = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1279 | } |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1280 | if (port->count) { |
| 1281 | spin_unlock_irqrestore(&port->lock, flags); |
Nobuhiro Iwamatsu | 5595621 | 2011-08-29 15:43:36 +0900 | [diff] [blame^] | 1282 | return; |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1283 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1284 | |
| 1285 | /* |
| 1286 | * Now we wait for the transmit buffer to clear; and we notify |
| 1287 | * the line discipline to only process XON/XOFF characters by |
| 1288 | * setting tty->closing. |
| 1289 | */ |
Jiri Slaby | 426929f | 2011-08-25 15:12:04 +0200 | [diff] [blame] | 1290 | set_bit(ASYNCB_CLOSING, &port->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1291 | tty->closing = 1; |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1292 | spin_unlock_irqrestore(&port->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1293 | |
Jiri Slaby | 1f33a51 | 2011-07-14 14:35:10 +0200 | [diff] [blame] | 1294 | if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE) |
Jiri Slaby | 0b05835 | 2011-08-25 15:12:08 +0200 | [diff] [blame] | 1295 | tty_wait_until_sent_from_close(tty, |
| 1296 | msecs_to_jiffies(port->closing_wait)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1297 | |
| 1298 | /* |
| 1299 | * At this point, we stop accepting input. To do this, we |
| 1300 | * disable the receive line status interrupts. |
| 1301 | */ |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1302 | if (port->flags & ASYNC_INITIALIZED) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1303 | unsigned long flags; |
Linus Torvalds | eea7e17 | 2009-10-12 19:13:54 +0200 | [diff] [blame] | 1304 | spin_lock_irqsave(&uport->lock, flags); |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1305 | uport->ops->stop_rx(uport); |
Linus Torvalds | eea7e17 | 2009-10-12 19:13:54 +0200 | [diff] [blame] | 1306 | spin_unlock_irqrestore(&uport->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1307 | /* |
| 1308 | * Before we drop DTR, make sure the UART transmitter |
| 1309 | * has completely drained; this is especially |
| 1310 | * important if there is a transmit FIFO! |
| 1311 | */ |
Jiri Slaby | 1f33a51 | 2011-07-14 14:35:10 +0200 | [diff] [blame] | 1312 | uart_wait_until_sent(tty, uport->timeout); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1313 | } |
| 1314 | |
Jiri Slaby | bafb0bd | 2011-08-25 15:12:05 +0200 | [diff] [blame] | 1315 | mutex_lock(&port->mutex); |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 1316 | uart_shutdown(tty, state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1317 | uart_flush_buffer(tty); |
| 1318 | |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 1319 | tty_ldisc_flush(tty); |
| 1320 | |
Alan Cox | 7b01478 | 2009-09-19 13:13:33 -0700 | [diff] [blame] | 1321 | tty_port_tty_set(port, NULL); |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1322 | spin_lock_irqsave(&port->lock, flags); |
| 1323 | tty->closing = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1324 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1325 | if (port->blocked_open) { |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1326 | spin_unlock_irqrestore(&port->lock, flags); |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1327 | if (port->close_delay) |
| 1328 | msleep_interruptible(port->close_delay); |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1329 | spin_lock_irqsave(&port->lock, flags); |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1330 | } else if (!uart_console(uport)) { |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1331 | spin_unlock_irqrestore(&port->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1332 | uart_change_pm(state, 3); |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1333 | spin_lock_irqsave(&port->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1334 | } |
| 1335 | |
| 1336 | /* |
| 1337 | * Wake up anyone trying to open this port. |
| 1338 | */ |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1339 | clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); |
Jiri Slaby | 426929f | 2011-08-25 15:12:04 +0200 | [diff] [blame] | 1340 | clear_bit(ASYNCB_CLOSING, &port->flags); |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1341 | spin_unlock_irqrestore(&port->lock, flags); |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1342 | wake_up_interruptible(&port->open_wait); |
Jiri Slaby | 426929f | 2011-08-25 15:12:04 +0200 | [diff] [blame] | 1343 | wake_up_interruptible(&port->close_wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1344 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1345 | mutex_unlock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1346 | } |
| 1347 | |
Jiri Slaby | 1f33a51 | 2011-07-14 14:35:10 +0200 | [diff] [blame] | 1348 | static void uart_wait_until_sent(struct tty_struct *tty, int timeout) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1349 | { |
Jiri Slaby | 1f33a51 | 2011-07-14 14:35:10 +0200 | [diff] [blame] | 1350 | struct uart_state *state = tty->driver_data; |
| 1351 | struct uart_port *port = state->uart_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1352 | unsigned long char_time, expire; |
| 1353 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1354 | if (port->type == PORT_UNKNOWN || port->fifosize == 0) |
| 1355 | return; |
| 1356 | |
| 1357 | /* |
| 1358 | * Set the check interval to be 1/5 of the estimated time to |
| 1359 | * send a single character, and make it at least 1. The check |
| 1360 | * interval should also be less than the timeout. |
| 1361 | * |
| 1362 | * Note: we have to use pretty tight timings here to satisfy |
| 1363 | * the NIST-PCTS. |
| 1364 | */ |
| 1365 | char_time = (port->timeout - HZ/50) / port->fifosize; |
| 1366 | char_time = char_time / 5; |
| 1367 | if (char_time == 0) |
| 1368 | char_time = 1; |
| 1369 | if (timeout && timeout < char_time) |
| 1370 | char_time = timeout; |
| 1371 | |
| 1372 | /* |
| 1373 | * If the transmitter hasn't cleared in twice the approximate |
| 1374 | * amount of time to send the entire FIFO, it probably won't |
| 1375 | * ever clear. This assumes the UART isn't doing flow |
| 1376 | * control, which is currently the case. Hence, if it ever |
| 1377 | * takes longer than port->timeout, this is probably due to a |
| 1378 | * UART bug of some kind. So, we clamp the timeout parameter at |
| 1379 | * 2*port->timeout. |
| 1380 | */ |
| 1381 | if (timeout == 0 || timeout > 2 * port->timeout) |
| 1382 | timeout = 2 * port->timeout; |
| 1383 | |
| 1384 | expire = jiffies + timeout; |
| 1385 | |
Jiri Slaby | eb3a1e1 | 2007-05-06 14:48:52 -0700 | [diff] [blame] | 1386 | pr_debug("uart_wait_until_sent(%d), jiffies=%lu, expire=%lu...\n", |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 1387 | port->line, jiffies, expire); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1388 | |
| 1389 | /* |
| 1390 | * Check whether the transmitter is empty every 'char_time'. |
| 1391 | * 'timeout' / 'expire' give us the maximum amount of time |
| 1392 | * we wait. |
| 1393 | */ |
| 1394 | while (!port->ops->tx_empty(port)) { |
| 1395 | msleep_interruptible(jiffies_to_msecs(char_time)); |
| 1396 | if (signal_pending(current)) |
| 1397 | break; |
| 1398 | if (time_after(jiffies, expire)) |
| 1399 | break; |
| 1400 | } |
Arnd Bergmann | 2036521 | 2010-06-01 22:53:07 +0200 | [diff] [blame] | 1401 | } |
| 1402 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1403 | /* |
| 1404 | * This is called with the BKL held in |
| 1405 | * linux/drivers/char/tty_io.c:do_tty_hangup() |
| 1406 | * We're called from the eventd thread, so we can sleep for |
| 1407 | * a _short_ time only. |
| 1408 | */ |
| 1409 | static void uart_hangup(struct tty_struct *tty) |
| 1410 | { |
| 1411 | struct uart_state *state = tty->driver_data; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1412 | struct tty_port *port = &state->port; |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1413 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1414 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1415 | pr_debug("uart_hangup(%d)\n", state->uart_port->line); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1416 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1417 | mutex_lock(&port->mutex); |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1418 | if (port->flags & ASYNC_NORMAL_ACTIVE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1419 | uart_flush_buffer(tty); |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 1420 | uart_shutdown(tty, state); |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1421 | spin_lock_irqsave(&port->lock, flags); |
Alan Cox | 91312cd | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1422 | port->count = 0; |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1423 | clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1424 | spin_unlock_irqrestore(&port->lock, flags); |
Alan Cox | 7b01478 | 2009-09-19 13:13:33 -0700 | [diff] [blame] | 1425 | tty_port_tty_set(port, NULL); |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1426 | wake_up_interruptible(&port->open_wait); |
Alan Cox | bdc04e3 | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1427 | wake_up_interruptible(&port->delta_msr_wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1428 | } |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1429 | mutex_unlock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1430 | } |
| 1431 | |
Alan Cox | de0c8cb | 2010-06-01 22:52:58 +0200 | [diff] [blame] | 1432 | static int uart_carrier_raised(struct tty_port *port) |
| 1433 | { |
| 1434 | struct uart_state *state = container_of(port, struct uart_state, port); |
| 1435 | struct uart_port *uport = state->uart_port; |
| 1436 | int mctrl; |
Alan Cox | de0c8cb | 2010-06-01 22:52:58 +0200 | [diff] [blame] | 1437 | spin_lock_irq(&uport->lock); |
| 1438 | uport->ops->enable_ms(uport); |
| 1439 | mctrl = uport->ops->get_mctrl(uport); |
| 1440 | spin_unlock_irq(&uport->lock); |
Alan Cox | de0c8cb | 2010-06-01 22:52:58 +0200 | [diff] [blame] | 1441 | if (mctrl & TIOCM_CAR) |
| 1442 | return 1; |
| 1443 | return 0; |
| 1444 | } |
| 1445 | |
| 1446 | static void uart_dtr_rts(struct tty_port *port, int onoff) |
| 1447 | { |
| 1448 | struct uart_state *state = container_of(port, struct uart_state, port); |
| 1449 | struct uart_port *uport = state->uart_port; |
Alan Cox | 24fcc7c | 2010-06-01 22:52:59 +0200 | [diff] [blame] | 1450 | |
Jiri Slaby | 6f5c24a | 2011-03-30 00:10:57 +0200 | [diff] [blame] | 1451 | if (onoff) |
Alan Cox | de0c8cb | 2010-06-01 22:52:58 +0200 | [diff] [blame] | 1452 | uart_set_mctrl(uport, TIOCM_DTR | TIOCM_RTS); |
| 1453 | else |
| 1454 | uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); |
Alan Cox | de0c8cb | 2010-06-01 22:52:58 +0200 | [diff] [blame] | 1455 | } |
| 1456 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1457 | static struct uart_state *uart_get(struct uart_driver *drv, int line) |
| 1458 | { |
| 1459 | struct uart_state *state; |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1460 | struct tty_port *port; |
Russell King | 68ac64c | 2006-04-30 11:13:50 +0100 | [diff] [blame] | 1461 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1462 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1463 | state = drv->state + line; |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1464 | port = &state->port; |
| 1465 | if (mutex_lock_interruptible(&port->mutex)) { |
Russell King | 68ac64c | 2006-04-30 11:13:50 +0100 | [diff] [blame] | 1466 | ret = -ERESTARTSYS; |
| 1467 | goto err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1468 | } |
| 1469 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1470 | port->count++; |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1471 | if (!state->uart_port || state->uart_port->flags & UPF_DEAD) { |
Russell King | 68ac64c | 2006-04-30 11:13:50 +0100 | [diff] [blame] | 1472 | ret = -ENXIO; |
| 1473 | goto err_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1474 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1475 | return state; |
Russell King | 68ac64c | 2006-04-30 11:13:50 +0100 | [diff] [blame] | 1476 | |
| 1477 | err_unlock: |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1478 | port->count--; |
| 1479 | mutex_unlock(&port->mutex); |
Russell King | 68ac64c | 2006-04-30 11:13:50 +0100 | [diff] [blame] | 1480 | err: |
| 1481 | return ERR_PTR(ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1482 | } |
| 1483 | |
| 1484 | /* |
Denis Cheng | 922f9cf | 2008-02-08 04:22:00 -0800 | [diff] [blame] | 1485 | * calls to uart_open are serialised by the BKL in |
| 1486 | * fs/char_dev.c:chrdev_open() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1487 | * Note that if this fails, then uart_close() _will_ be called. |
| 1488 | * |
| 1489 | * In time, we want to scrap the "opening nonpresent ports" |
| 1490 | * behaviour and implement an alternative way for setserial |
| 1491 | * to set base addresses/ports/types. This will allow us to |
| 1492 | * get rid of a certain amount of extra tests. |
| 1493 | */ |
| 1494 | static int uart_open(struct tty_struct *tty, struct file *filp) |
| 1495 | { |
| 1496 | struct uart_driver *drv = (struct uart_driver *)tty->driver->driver_state; |
| 1497 | struct uart_state *state; |
Alan Cox | 91312cd | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1498 | struct tty_port *port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1499 | int retval, line = tty->index; |
| 1500 | |
Jiri Slaby | eb3a1e1 | 2007-05-06 14:48:52 -0700 | [diff] [blame] | 1501 | pr_debug("uart_open(%d) called\n", line); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1502 | |
| 1503 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1504 | * 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] | 1505 | * be re-entered while allocating the state structure, or while we |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1506 | * request any IRQs that the driver may need. This also has the nice |
| 1507 | * 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] | 1508 | * guarantee that state->port.tty will always contain something |
| 1509 | * reasonable. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1510 | */ |
| 1511 | state = uart_get(drv, line); |
| 1512 | if (IS_ERR(state)) { |
| 1513 | retval = PTR_ERR(state); |
| 1514 | goto fail; |
| 1515 | } |
Alan Cox | 91312cd | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1516 | port = &state->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1517 | |
| 1518 | /* |
| 1519 | * Once we set tty->driver_data here, we are guaranteed that |
| 1520 | * uart_close() will decrement the driver module use count. |
| 1521 | * Any failures from here onwards should not touch the count. |
| 1522 | */ |
| 1523 | tty->driver_data = state; |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1524 | state->uart_port->state = state; |
| 1525 | tty->low_latency = (state->uart_port->flags & UPF_LOW_LATENCY) ? 1 : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1526 | tty->alt_speed = 0; |
Alan Cox | 7b01478 | 2009-09-19 13:13:33 -0700 | [diff] [blame] | 1527 | tty_port_tty_set(port, tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1528 | |
| 1529 | /* |
| 1530 | * If the port is in the middle of closing, bail out now. |
| 1531 | */ |
| 1532 | if (tty_hung_up_p(filp)) { |
| 1533 | retval = -EAGAIN; |
Alan Cox | 91312cd | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1534 | port->count--; |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1535 | mutex_unlock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1536 | goto fail; |
| 1537 | } |
| 1538 | |
| 1539 | /* |
| 1540 | * Make sure the device is in D0 state. |
| 1541 | */ |
Alan Cox | 91312cd | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1542 | if (port->count == 1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1543 | uart_change_pm(state, 0); |
| 1544 | |
| 1545 | /* |
| 1546 | * Start up the serial port. |
| 1547 | */ |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 1548 | retval = uart_startup(tty, state, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1549 | |
| 1550 | /* |
| 1551 | * If we succeeded, wait until the port is ready. |
| 1552 | */ |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1553 | mutex_unlock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1554 | if (retval == 0) |
Alan Cox | 74c2107 | 2010-06-01 22:53:00 +0200 | [diff] [blame] | 1555 | retval = tty_port_block_til_ready(port, tty, filp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1556 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1557 | fail: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1558 | return retval; |
| 1559 | } |
| 1560 | |
| 1561 | static const char *uart_type(struct uart_port *port) |
| 1562 | { |
| 1563 | const char *str = NULL; |
| 1564 | |
| 1565 | if (port->ops->type) |
| 1566 | str = port->ops->type(port); |
| 1567 | |
| 1568 | if (!str) |
| 1569 | str = "unknown"; |
| 1570 | |
| 1571 | return str; |
| 1572 | } |
| 1573 | |
| 1574 | #ifdef CONFIG_PROC_FS |
| 1575 | |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1576 | 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] | 1577 | { |
| 1578 | struct uart_state *state = drv->state + i; |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1579 | struct tty_port *port = &state->port; |
George G. Davis | 3689a0e | 2007-02-14 00:33:06 -0800 | [diff] [blame] | 1580 | int pm_state; |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1581 | struct uart_port *uport = state->uart_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1582 | char stat_buf[32]; |
| 1583 | unsigned int status; |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1584 | int mmio; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1585 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1586 | if (!uport) |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1587 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1588 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1589 | mmio = uport->iotype >= UPIO_MEM; |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1590 | seq_printf(m, "%d: uart:%s %s%08llX irq:%d", |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1591 | uport->line, uart_type(uport), |
Sergei Shtylyov | 6c6a233 | 2006-09-04 00:04:20 +0400 | [diff] [blame] | 1592 | mmio ? "mmio:0x" : "port:", |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1593 | mmio ? (unsigned long long)uport->mapbase |
| 1594 | : (unsigned long long)uport->iobase, |
| 1595 | uport->irq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1596 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1597 | if (uport->type == PORT_UNKNOWN) { |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1598 | seq_putc(m, '\n'); |
| 1599 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1600 | } |
| 1601 | |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 1602 | if (capable(CAP_SYS_ADMIN)) { |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1603 | mutex_lock(&port->mutex); |
George G. Davis | 3689a0e | 2007-02-14 00:33:06 -0800 | [diff] [blame] | 1604 | pm_state = state->pm_state; |
| 1605 | if (pm_state) |
| 1606 | uart_change_pm(state, 0); |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1607 | spin_lock_irq(&uport->lock); |
| 1608 | status = uport->ops->get_mctrl(uport); |
| 1609 | spin_unlock_irq(&uport->lock); |
George G. Davis | 3689a0e | 2007-02-14 00:33:06 -0800 | [diff] [blame] | 1610 | if (pm_state) |
| 1611 | uart_change_pm(state, pm_state); |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1612 | mutex_unlock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1613 | |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1614 | seq_printf(m, " tx:%d rx:%d", |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1615 | uport->icount.tx, uport->icount.rx); |
| 1616 | if (uport->icount.frame) |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1617 | seq_printf(m, " fe:%d", |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1618 | uport->icount.frame); |
| 1619 | if (uport->icount.parity) |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1620 | seq_printf(m, " pe:%d", |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1621 | uport->icount.parity); |
| 1622 | if (uport->icount.brk) |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1623 | seq_printf(m, " brk:%d", |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1624 | uport->icount.brk); |
| 1625 | if (uport->icount.overrun) |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1626 | seq_printf(m, " oe:%d", |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1627 | uport->icount.overrun); |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 1628 | |
| 1629 | #define INFOBIT(bit, str) \ |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1630 | if (uport->mctrl & (bit)) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1631 | strncat(stat_buf, (str), sizeof(stat_buf) - \ |
| 1632 | strlen(stat_buf) - 2) |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 1633 | #define STATBIT(bit, str) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1634 | if (status & (bit)) \ |
| 1635 | strncat(stat_buf, (str), sizeof(stat_buf) - \ |
| 1636 | strlen(stat_buf) - 2) |
| 1637 | |
| 1638 | stat_buf[0] = '\0'; |
| 1639 | stat_buf[1] = '\0'; |
| 1640 | INFOBIT(TIOCM_RTS, "|RTS"); |
| 1641 | STATBIT(TIOCM_CTS, "|CTS"); |
| 1642 | INFOBIT(TIOCM_DTR, "|DTR"); |
| 1643 | STATBIT(TIOCM_DSR, "|DSR"); |
| 1644 | STATBIT(TIOCM_CAR, "|CD"); |
| 1645 | STATBIT(TIOCM_RNG, "|RI"); |
| 1646 | if (stat_buf[0]) |
| 1647 | stat_buf[0] = ' '; |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 1648 | |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1649 | seq_puts(m, stat_buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1650 | } |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1651 | seq_putc(m, '\n'); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1652 | #undef STATBIT |
| 1653 | #undef INFOBIT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1654 | } |
| 1655 | |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1656 | static int uart_proc_show(struct seq_file *m, void *v) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1657 | { |
Alexey Dobriyan | 833bb30 | 2009-04-02 01:30:04 +0400 | [diff] [blame] | 1658 | struct tty_driver *ttydrv = m->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1659 | struct uart_driver *drv = ttydrv->driver_state; |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1660 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1661 | |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1662 | seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1663 | "", "", ""); |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1664 | for (i = 0; i < drv->nr; i++) |
| 1665 | uart_line_info(m, drv, i); |
| 1666 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1667 | } |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1668 | |
| 1669 | static int uart_proc_open(struct inode *inode, struct file *file) |
| 1670 | { |
| 1671 | return single_open(file, uart_proc_show, PDE(inode)->data); |
| 1672 | } |
| 1673 | |
| 1674 | static const struct file_operations uart_proc_fops = { |
| 1675 | .owner = THIS_MODULE, |
| 1676 | .open = uart_proc_open, |
| 1677 | .read = seq_read, |
| 1678 | .llseek = seq_lseek, |
| 1679 | .release = single_release, |
| 1680 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1681 | #endif |
| 1682 | |
Andrew Morton | 4a1b550 | 2008-03-07 15:51:16 -0800 | [diff] [blame] | 1683 | #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1684 | /* |
Russell King | d358788 | 2006-03-20 20:00:09 +0000 | [diff] [blame] | 1685 | * uart_console_write - write a console message to a serial port |
| 1686 | * @port: the port to write the message |
| 1687 | * @s: array of characters |
| 1688 | * @count: number of characters in string to write |
| 1689 | * @write: function to write character to port |
| 1690 | */ |
| 1691 | void uart_console_write(struct uart_port *port, const char *s, |
| 1692 | unsigned int count, |
| 1693 | void (*putchar)(struct uart_port *, int)) |
| 1694 | { |
| 1695 | unsigned int i; |
| 1696 | |
| 1697 | for (i = 0; i < count; i++, s++) { |
| 1698 | if (*s == '\n') |
| 1699 | putchar(port, '\r'); |
| 1700 | putchar(port, *s); |
| 1701 | } |
| 1702 | } |
| 1703 | EXPORT_SYMBOL_GPL(uart_console_write); |
| 1704 | |
| 1705 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1706 | * Check whether an invalid uart number has been specified, and |
| 1707 | * if so, search for the first available port that does have |
| 1708 | * console support. |
| 1709 | */ |
| 1710 | struct uart_port * __init |
| 1711 | uart_get_console(struct uart_port *ports, int nr, struct console *co) |
| 1712 | { |
| 1713 | int idx = co->index; |
| 1714 | |
| 1715 | if (idx < 0 || idx >= nr || (ports[idx].iobase == 0 && |
| 1716 | ports[idx].membase == NULL)) |
| 1717 | for (idx = 0; idx < nr; idx++) |
| 1718 | if (ports[idx].iobase != 0 || |
| 1719 | ports[idx].membase != NULL) |
| 1720 | break; |
| 1721 | |
| 1722 | co->index = idx; |
| 1723 | |
| 1724 | return ports + idx; |
| 1725 | } |
| 1726 | |
| 1727 | /** |
| 1728 | * uart_parse_options - Parse serial port baud/parity/bits/flow contro. |
| 1729 | * @options: pointer to option string |
| 1730 | * @baud: pointer to an 'int' variable for the baud rate. |
| 1731 | * @parity: pointer to an 'int' variable for the parity. |
| 1732 | * @bits: pointer to an 'int' variable for the number of data bits. |
| 1733 | * @flow: pointer to an 'int' variable for the flow control character. |
| 1734 | * |
| 1735 | * uart_parse_options decodes a string containing the serial console |
| 1736 | * options. The format of the string is <baud><parity><bits><flow>, |
| 1737 | * eg: 115200n8r |
| 1738 | */ |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 1739 | void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1740 | uart_parse_options(char *options, int *baud, int *parity, int *bits, int *flow) |
| 1741 | { |
| 1742 | char *s = options; |
| 1743 | |
| 1744 | *baud = simple_strtoul(s, NULL, 10); |
| 1745 | while (*s >= '0' && *s <= '9') |
| 1746 | s++; |
| 1747 | if (*s) |
| 1748 | *parity = *s++; |
| 1749 | if (*s) |
| 1750 | *bits = *s++ - '0'; |
| 1751 | if (*s) |
| 1752 | *flow = *s; |
| 1753 | } |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 1754 | EXPORT_SYMBOL_GPL(uart_parse_options); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1755 | |
| 1756 | struct baud_rates { |
| 1757 | unsigned int rate; |
| 1758 | unsigned int cflag; |
| 1759 | }; |
| 1760 | |
Arjan van de Ven | cb3592b | 2005-11-28 21:04:11 +0000 | [diff] [blame] | 1761 | static const struct baud_rates baud_rates[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1762 | { 921600, B921600 }, |
| 1763 | { 460800, B460800 }, |
| 1764 | { 230400, B230400 }, |
| 1765 | { 115200, B115200 }, |
| 1766 | { 57600, B57600 }, |
| 1767 | { 38400, B38400 }, |
| 1768 | { 19200, B19200 }, |
| 1769 | { 9600, B9600 }, |
| 1770 | { 4800, B4800 }, |
| 1771 | { 2400, B2400 }, |
| 1772 | { 1200, B1200 }, |
| 1773 | { 0, B38400 } |
| 1774 | }; |
| 1775 | |
| 1776 | /** |
| 1777 | * uart_set_options - setup the serial console parameters |
| 1778 | * @port: pointer to the serial ports uart_port structure |
| 1779 | * @co: console pointer |
| 1780 | * @baud: baud rate |
| 1781 | * @parity: parity character - 'n' (none), 'o' (odd), 'e' (even) |
| 1782 | * @bits: number of data bits |
| 1783 | * @flow: flow control character - 'r' (rts) |
| 1784 | */ |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 1785 | int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1786 | uart_set_options(struct uart_port *port, struct console *co, |
| 1787 | int baud, int parity, int bits, int flow) |
| 1788 | { |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 1789 | struct ktermios termios; |
Alan Cox | 149b36e | 2007-10-18 01:24:16 -0700 | [diff] [blame] | 1790 | static struct ktermios dummy; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1791 | int i; |
| 1792 | |
Russell King | 976ecd1 | 2005-07-03 21:05:45 +0100 | [diff] [blame] | 1793 | /* |
| 1794 | * Ensure that the serial console lock is initialised |
| 1795 | * early. |
| 1796 | */ |
| 1797 | spin_lock_init(&port->lock); |
Ingo Molnar | 13e8359 | 2006-07-03 00:25:03 -0700 | [diff] [blame] | 1798 | lockdep_set_class(&port->lock, &port_lock_key); |
Russell King | 976ecd1 | 2005-07-03 21:05:45 +0100 | [diff] [blame] | 1799 | |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 1800 | memset(&termios, 0, sizeof(struct ktermios)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1801 | |
| 1802 | termios.c_cflag = CREAD | HUPCL | CLOCAL; |
| 1803 | |
| 1804 | /* |
| 1805 | * Construct a cflag setting. |
| 1806 | */ |
| 1807 | for (i = 0; baud_rates[i].rate; i++) |
| 1808 | if (baud_rates[i].rate <= baud) |
| 1809 | break; |
| 1810 | |
| 1811 | termios.c_cflag |= baud_rates[i].cflag; |
| 1812 | |
| 1813 | if (bits == 7) |
| 1814 | termios.c_cflag |= CS7; |
| 1815 | else |
| 1816 | termios.c_cflag |= CS8; |
| 1817 | |
| 1818 | switch (parity) { |
| 1819 | case 'o': case 'O': |
| 1820 | termios.c_cflag |= PARODD; |
| 1821 | /*fall through*/ |
| 1822 | case 'e': case 'E': |
| 1823 | termios.c_cflag |= PARENB; |
| 1824 | break; |
| 1825 | } |
| 1826 | |
| 1827 | if (flow == 'r') |
| 1828 | termios.c_cflag |= CRTSCTS; |
| 1829 | |
Yinghai Lu | 7949268 | 2007-07-15 23:37:25 -0700 | [diff] [blame] | 1830 | /* |
| 1831 | * some uarts on other side don't support no flow control. |
| 1832 | * So we set * DTR in host uart to make them happy |
| 1833 | */ |
| 1834 | port->mctrl |= TIOCM_DTR; |
| 1835 | |
Alan Cox | 149b36e | 2007-10-18 01:24:16 -0700 | [diff] [blame] | 1836 | port->ops->set_termios(port, &termios, &dummy); |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 1837 | /* |
| 1838 | * Allow the setting of the UART parameters with a NULL console |
| 1839 | * too: |
| 1840 | */ |
| 1841 | if (co) |
| 1842 | co->cflag = termios.c_cflag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1843 | |
| 1844 | return 0; |
| 1845 | } |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 1846 | EXPORT_SYMBOL_GPL(uart_set_options); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1847 | #endif /* CONFIG_SERIAL_CORE_CONSOLE */ |
| 1848 | |
| 1849 | static void uart_change_pm(struct uart_state *state, int pm_state) |
| 1850 | { |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1851 | struct uart_port *port = state->uart_port; |
Andrew Victor | 1281e36 | 2006-05-16 11:28:49 +0100 | [diff] [blame] | 1852 | |
| 1853 | if (state->pm_state != pm_state) { |
| 1854 | if (port->ops->pm) |
| 1855 | port->ops->pm(port, pm_state, state->pm_state); |
| 1856 | state->pm_state = pm_state; |
| 1857 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1858 | } |
| 1859 | |
Guennadi Liakhovetski | b3b708f | 2007-10-16 01:24:02 -0700 | [diff] [blame] | 1860 | struct uart_match { |
| 1861 | struct uart_port *port; |
| 1862 | struct uart_driver *driver; |
| 1863 | }; |
| 1864 | |
| 1865 | static int serial_match_port(struct device *dev, void *data) |
| 1866 | { |
| 1867 | struct uart_match *match = data; |
Guennadi Liakhovetski | 7ca796f | 2008-07-04 09:59:28 -0700 | [diff] [blame] | 1868 | struct tty_driver *tty_drv = match->driver->tty_driver; |
| 1869 | dev_t devt = MKDEV(tty_drv->major, tty_drv->minor_start) + |
| 1870 | match->port->line; |
Guennadi Liakhovetski | b3b708f | 2007-10-16 01:24:02 -0700 | [diff] [blame] | 1871 | |
| 1872 | return dev->devt == devt; /* Actually, only one tty per port */ |
| 1873 | } |
| 1874 | |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1875 | int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1876 | { |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1877 | struct uart_state *state = drv->state + uport->line; |
| 1878 | struct tty_port *port = &state->port; |
Guennadi Liakhovetski | b3b708f | 2007-10-16 01:24:02 -0700 | [diff] [blame] | 1879 | struct device *tty_dev; |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1880 | struct uart_match match = {uport, drv}; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1881 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1882 | mutex_lock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1883 | |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1884 | tty_dev = device_find_child(uport->dev, &match, serial_match_port); |
Guennadi Liakhovetski | b3b708f | 2007-10-16 01:24:02 -0700 | [diff] [blame] | 1885 | if (device_may_wakeup(tty_dev)) { |
Govindraj.R | 3f960db | 2010-12-16 18:12:47 +0530 | [diff] [blame] | 1886 | if (!enable_irq_wake(uport->irq)) |
| 1887 | uport->irq_wake = 1; |
Guennadi Liakhovetski | b3b708f | 2007-10-16 01:24:02 -0700 | [diff] [blame] | 1888 | put_device(tty_dev); |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1889 | mutex_unlock(&port->mutex); |
Guennadi Liakhovetski | b3b708f | 2007-10-16 01:24:02 -0700 | [diff] [blame] | 1890 | return 0; |
| 1891 | } |
Stanislav Brabec | 4547be7 | 2009-12-02 16:20:56 +0100 | [diff] [blame] | 1892 | if (console_suspend_enabled || !uart_console(uport)) |
| 1893 | uport->suspended = 1; |
Guennadi Liakhovetski | b3b708f | 2007-10-16 01:24:02 -0700 | [diff] [blame] | 1894 | |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1895 | if (port->flags & ASYNC_INITIALIZED) { |
| 1896 | const struct uart_ops *ops = uport->ops; |
Russell King | c8c6bfa | 2008-02-04 22:27:52 -0800 | [diff] [blame] | 1897 | int tries; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1898 | |
Stanislav Brabec | 4547be7 | 2009-12-02 16:20:56 +0100 | [diff] [blame] | 1899 | if (console_suspend_enabled || !uart_console(uport)) { |
| 1900 | set_bit(ASYNCB_SUSPENDED, &port->flags); |
| 1901 | clear_bit(ASYNCB_INITIALIZED, &port->flags); |
Russell King | a6b93a9 | 2006-10-01 17:17:40 +0100 | [diff] [blame] | 1902 | |
Stanislav Brabec | 4547be7 | 2009-12-02 16:20:56 +0100 | [diff] [blame] | 1903 | spin_lock_irq(&uport->lock); |
| 1904 | ops->stop_tx(uport); |
| 1905 | ops->set_mctrl(uport, 0); |
| 1906 | ops->stop_rx(uport); |
| 1907 | spin_unlock_irq(&uport->lock); |
| 1908 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1909 | |
| 1910 | /* |
| 1911 | * Wait for the transmitter to empty. |
| 1912 | */ |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1913 | for (tries = 3; !ops->tx_empty(uport) && tries; tries--) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1914 | msleep(10); |
Russell King | c8c6bfa | 2008-02-04 22:27:52 -0800 | [diff] [blame] | 1915 | if (!tries) |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 1916 | printk(KERN_ERR "%s%s%s%d: Unable to drain " |
| 1917 | "transmitter\n", |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1918 | uport->dev ? dev_name(uport->dev) : "", |
| 1919 | uport->dev ? ": " : "", |
David S. Miller | 8440838 | 2008-10-13 10:45:26 +0100 | [diff] [blame] | 1920 | drv->dev_name, |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1921 | drv->tty_driver->name_base + uport->line); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1922 | |
Stanislav Brabec | 4547be7 | 2009-12-02 16:20:56 +0100 | [diff] [blame] | 1923 | if (console_suspend_enabled || !uart_console(uport)) |
| 1924 | ops->shutdown(uport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1925 | } |
| 1926 | |
| 1927 | /* |
| 1928 | * Disable the console device before suspending. |
| 1929 | */ |
Stanislav Brabec | 4547be7 | 2009-12-02 16:20:56 +0100 | [diff] [blame] | 1930 | if (console_suspend_enabled && uart_console(uport)) |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1931 | console_stop(uport->cons); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1932 | |
Stanislav Brabec | 4547be7 | 2009-12-02 16:20:56 +0100 | [diff] [blame] | 1933 | if (console_suspend_enabled || !uart_console(uport)) |
| 1934 | uart_change_pm(state, 3); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1935 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1936 | mutex_unlock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1937 | |
| 1938 | return 0; |
| 1939 | } |
| 1940 | |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1941 | int uart_resume_port(struct uart_driver *drv, struct uart_port *uport) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1942 | { |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1943 | struct uart_state *state = drv->state + uport->line; |
| 1944 | struct tty_port *port = &state->port; |
Arjan van de Ven | 03a74dc | 2008-05-23 13:04:49 -0700 | [diff] [blame] | 1945 | struct device *tty_dev; |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1946 | struct uart_match match = {uport, drv}; |
Deepak Saxena | ba15ab0 | 2009-09-19 13:13:33 -0700 | [diff] [blame] | 1947 | struct ktermios termios; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1948 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1949 | mutex_lock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1950 | |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1951 | tty_dev = device_find_child(uport->dev, &match, serial_match_port); |
| 1952 | if (!uport->suspended && device_may_wakeup(tty_dev)) { |
Govindraj.R | 3f960db | 2010-12-16 18:12:47 +0530 | [diff] [blame] | 1953 | if (uport->irq_wake) { |
| 1954 | disable_irq_wake(uport->irq); |
| 1955 | uport->irq_wake = 0; |
| 1956 | } |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1957 | mutex_unlock(&port->mutex); |
Guennadi Liakhovetski | b3b708f | 2007-10-16 01:24:02 -0700 | [diff] [blame] | 1958 | return 0; |
| 1959 | } |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1960 | uport->suspended = 0; |
Guennadi Liakhovetski | b3b708f | 2007-10-16 01:24:02 -0700 | [diff] [blame] | 1961 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1962 | /* |
| 1963 | * Re-enable the console device after suspending. |
| 1964 | */ |
Yin Kangkai | 5933a16 | 2011-01-30 11:15:30 +0800 | [diff] [blame] | 1965 | if (uart_console(uport)) { |
Jason Wang | 891b9dd | 2010-08-21 15:14:42 +0800 | [diff] [blame] | 1966 | /* |
| 1967 | * First try to use the console cflag setting. |
| 1968 | */ |
| 1969 | memset(&termios, 0, sizeof(struct ktermios)); |
| 1970 | termios.c_cflag = uport->cons->cflag; |
| 1971 | |
| 1972 | /* |
| 1973 | * If that's unset, use the tty termios setting. |
| 1974 | */ |
| 1975 | if (port->tty && port->tty->termios && termios.c_cflag == 0) |
| 1976 | termios = *(port->tty->termios); |
| 1977 | |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1978 | uport->ops->set_termios(uport, &termios, NULL); |
Yin Kangkai | 5933a16 | 2011-01-30 11:15:30 +0800 | [diff] [blame] | 1979 | if (console_suspend_enabled) |
| 1980 | console_start(uport->cons); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1981 | } |
| 1982 | |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1983 | if (port->flags & ASYNC_SUSPENDED) { |
| 1984 | const struct uart_ops *ops = uport->ops; |
Russell King | ee31b33 | 2005-11-13 15:28:51 +0000 | [diff] [blame] | 1985 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1986 | |
Russell King | 9d778a6 | 2008-02-04 22:27:51 -0800 | [diff] [blame] | 1987 | uart_change_pm(state, 0); |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1988 | spin_lock_irq(&uport->lock); |
| 1989 | ops->set_mctrl(uport, 0); |
| 1990 | spin_unlock_irq(&uport->lock); |
Stanislav Brabec | 4547be7 | 2009-12-02 16:20:56 +0100 | [diff] [blame] | 1991 | if (console_suspend_enabled || !uart_console(uport)) { |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 1992 | /* Protected by port mutex for now */ |
| 1993 | struct tty_struct *tty = port->tty; |
Stanislav Brabec | 4547be7 | 2009-12-02 16:20:56 +0100 | [diff] [blame] | 1994 | ret = ops->startup(uport); |
| 1995 | if (ret == 0) { |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 1996 | if (tty) |
| 1997 | uart_change_speed(tty, state, NULL); |
Stanislav Brabec | 4547be7 | 2009-12-02 16:20:56 +0100 | [diff] [blame] | 1998 | spin_lock_irq(&uport->lock); |
| 1999 | ops->set_mctrl(uport, uport->mctrl); |
| 2000 | ops->start_tx(uport); |
| 2001 | spin_unlock_irq(&uport->lock); |
| 2002 | set_bit(ASYNCB_INITIALIZED, &port->flags); |
| 2003 | } else { |
| 2004 | /* |
| 2005 | * Failed to resume - maybe hardware went away? |
| 2006 | * Clear the "initialized" flag so we won't try |
| 2007 | * to call the low level drivers shutdown method. |
| 2008 | */ |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 2009 | uart_shutdown(tty, state); |
Stanislav Brabec | 4547be7 | 2009-12-02 16:20:56 +0100 | [diff] [blame] | 2010 | } |
Russell King | ee31b33 | 2005-11-13 15:28:51 +0000 | [diff] [blame] | 2011 | } |
Russell King | a6b93a9 | 2006-10-01 17:17:40 +0100 | [diff] [blame] | 2012 | |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 2013 | clear_bit(ASYNCB_SUSPENDED, &port->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2014 | } |
| 2015 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2016 | mutex_unlock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2017 | |
| 2018 | return 0; |
| 2019 | } |
| 2020 | |
| 2021 | static inline void |
| 2022 | uart_report_port(struct uart_driver *drv, struct uart_port *port) |
| 2023 | { |
Russell King | 30b7a3b | 2005-09-03 15:30:21 +0100 | [diff] [blame] | 2024 | char address[64]; |
| 2025 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2026 | switch (port->iotype) { |
| 2027 | case UPIO_PORT: |
Andrew Morton | 9bde10a | 2008-10-13 10:35:42 +0100 | [diff] [blame] | 2028 | snprintf(address, sizeof(address), "I/O 0x%lx", port->iobase); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2029 | break; |
| 2030 | case UPIO_HUB6: |
Russell King | 30b7a3b | 2005-09-03 15:30:21 +0100 | [diff] [blame] | 2031 | snprintf(address, sizeof(address), |
Andrew Morton | 9bde10a | 2008-10-13 10:35:42 +0100 | [diff] [blame] | 2032 | "I/O 0x%lx offset 0x%x", port->iobase, port->hub6); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2033 | break; |
| 2034 | case UPIO_MEM: |
| 2035 | case UPIO_MEM32: |
Pantelis Antoniou | 21c614a | 2005-11-06 09:07:03 +0000 | [diff] [blame] | 2036 | case UPIO_AU: |
Zang Roy-r61911 | 3be91ec | 2006-06-30 02:29:58 -0700 | [diff] [blame] | 2037 | case UPIO_TSI: |
Russell King | 30b7a3b | 2005-09-03 15:30:21 +0100 | [diff] [blame] | 2038 | snprintf(address, sizeof(address), |
Josh Boyer | 4f640ef | 2007-07-23 18:43:44 -0700 | [diff] [blame] | 2039 | "MMIO 0x%llx", (unsigned long long)port->mapbase); |
Russell King | 30b7a3b | 2005-09-03 15:30:21 +0100 | [diff] [blame] | 2040 | break; |
| 2041 | default: |
| 2042 | strlcpy(address, "*unknown*", sizeof(address)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2043 | break; |
| 2044 | } |
Russell King | 30b7a3b | 2005-09-03 15:30:21 +0100 | [diff] [blame] | 2045 | |
Russell King | 0cf669d | 2005-10-31 11:42:22 +0000 | [diff] [blame] | 2046 | 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] | 2047 | port->dev ? dev_name(port->dev) : "", |
Russell King | 0cf669d | 2005-10-31 11:42:22 +0000 | [diff] [blame] | 2048 | port->dev ? ": " : "", |
David S. Miller | 8440838 | 2008-10-13 10:45:26 +0100 | [diff] [blame] | 2049 | drv->dev_name, |
| 2050 | drv->tty_driver->name_base + port->line, |
| 2051 | address, port->irq, uart_type(port)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2052 | } |
| 2053 | |
| 2054 | static void |
| 2055 | uart_configure_port(struct uart_driver *drv, struct uart_state *state, |
| 2056 | struct uart_port *port) |
| 2057 | { |
| 2058 | unsigned int flags; |
| 2059 | |
| 2060 | /* |
| 2061 | * If there isn't a port here, don't do anything further. |
| 2062 | */ |
| 2063 | if (!port->iobase && !port->mapbase && !port->membase) |
| 2064 | return; |
| 2065 | |
| 2066 | /* |
| 2067 | * Now do the auto configuration stuff. Note that config_port |
| 2068 | * is expected to claim the resources and map the port for us. |
| 2069 | */ |
David Daney | 8e23fcc | 2009-01-02 13:49:54 +0000 | [diff] [blame] | 2070 | flags = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2071 | if (port->flags & UPF_AUTO_IRQ) |
| 2072 | flags |= UART_CONFIG_IRQ; |
| 2073 | if (port->flags & UPF_BOOT_AUTOCONF) { |
David Daney | 8e23fcc | 2009-01-02 13:49:54 +0000 | [diff] [blame] | 2074 | if (!(port->flags & UPF_FIXED_TYPE)) { |
| 2075 | port->type = PORT_UNKNOWN; |
| 2076 | flags |= UART_CONFIG_TYPE; |
| 2077 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2078 | port->ops->config_port(port, flags); |
| 2079 | } |
| 2080 | |
| 2081 | if (port->type != PORT_UNKNOWN) { |
| 2082 | unsigned long flags; |
| 2083 | |
| 2084 | uart_report_port(drv, port); |
| 2085 | |
George G. Davis | 3689a0e | 2007-02-14 00:33:06 -0800 | [diff] [blame] | 2086 | /* Power up port for set_mctrl() */ |
| 2087 | uart_change_pm(state, 0); |
| 2088 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2089 | /* |
| 2090 | * Ensure that the modem control lines are de-activated. |
Yinghai Lu | c3e4642 | 2008-02-04 22:27:46 -0800 | [diff] [blame] | 2091 | * keep the DTR setting that is set in uart_set_options() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2092 | * We probably don't need a spinlock around this, but |
| 2093 | */ |
| 2094 | spin_lock_irqsave(&port->lock, flags); |
Yinghai Lu | c3e4642 | 2008-02-04 22:27:46 -0800 | [diff] [blame] | 2095 | port->ops->set_mctrl(port, port->mctrl & TIOCM_DTR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2096 | spin_unlock_irqrestore(&port->lock, flags); |
| 2097 | |
| 2098 | /* |
Russell King | 97d9722 | 2007-09-01 21:25:09 +0100 | [diff] [blame] | 2099 | * If this driver supports console, and it hasn't been |
| 2100 | * successfully registered yet, try to re-register it. |
| 2101 | * It may be that the port was not available. |
| 2102 | */ |
| 2103 | if (port->cons && !(port->cons->flags & CON_ENABLED)) |
| 2104 | register_console(port->cons); |
| 2105 | |
| 2106 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2107 | * Power down all ports by default, except the |
| 2108 | * console if we have one. |
| 2109 | */ |
| 2110 | if (!uart_console(port)) |
| 2111 | uart_change_pm(state, 3); |
| 2112 | } |
| 2113 | } |
| 2114 | |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 2115 | #ifdef CONFIG_CONSOLE_POLL |
| 2116 | |
| 2117 | static int uart_poll_init(struct tty_driver *driver, int line, char *options) |
| 2118 | { |
| 2119 | struct uart_driver *drv = driver->driver_state; |
| 2120 | struct uart_state *state = drv->state + line; |
| 2121 | struct uart_port *port; |
| 2122 | int baud = 9600; |
| 2123 | int bits = 8; |
| 2124 | int parity = 'n'; |
| 2125 | int flow = 'n'; |
| 2126 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 2127 | if (!state || !state->uart_port) |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 2128 | return -1; |
| 2129 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 2130 | port = state->uart_port; |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 2131 | if (!(port->ops->poll_get_char && port->ops->poll_put_char)) |
| 2132 | return -1; |
| 2133 | |
| 2134 | if (options) { |
| 2135 | uart_parse_options(options, &baud, &parity, &bits, &flow); |
| 2136 | return uart_set_options(port, NULL, baud, parity, bits, flow); |
| 2137 | } |
| 2138 | |
| 2139 | return 0; |
| 2140 | } |
| 2141 | |
| 2142 | static int uart_poll_get_char(struct tty_driver *driver, int line) |
| 2143 | { |
| 2144 | struct uart_driver *drv = driver->driver_state; |
| 2145 | struct uart_state *state = drv->state + line; |
| 2146 | struct uart_port *port; |
| 2147 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 2148 | if (!state || !state->uart_port) |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 2149 | return -1; |
| 2150 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 2151 | port = state->uart_port; |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 2152 | return port->ops->poll_get_char(port); |
| 2153 | } |
| 2154 | |
| 2155 | static void uart_poll_put_char(struct tty_driver *driver, int line, char ch) |
| 2156 | { |
| 2157 | struct uart_driver *drv = driver->driver_state; |
| 2158 | struct uart_state *state = drv->state + line; |
| 2159 | struct uart_port *port; |
| 2160 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 2161 | if (!state || !state->uart_port) |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 2162 | return; |
| 2163 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 2164 | port = state->uart_port; |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 2165 | port->ops->poll_put_char(port, ch); |
| 2166 | } |
| 2167 | #endif |
| 2168 | |
Jeff Dike | b68e31d | 2006-10-02 02:17:18 -0700 | [diff] [blame] | 2169 | static const struct tty_operations uart_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2170 | .open = uart_open, |
| 2171 | .close = uart_close, |
| 2172 | .write = uart_write, |
| 2173 | .put_char = uart_put_char, |
| 2174 | .flush_chars = uart_flush_chars, |
| 2175 | .write_room = uart_write_room, |
| 2176 | .chars_in_buffer= uart_chars_in_buffer, |
| 2177 | .flush_buffer = uart_flush_buffer, |
| 2178 | .ioctl = uart_ioctl, |
| 2179 | .throttle = uart_throttle, |
| 2180 | .unthrottle = uart_unthrottle, |
| 2181 | .send_xchar = uart_send_xchar, |
| 2182 | .set_termios = uart_set_termios, |
Alan Cox | 64e9159 | 2008-06-03 15:18:54 +0100 | [diff] [blame] | 2183 | .set_ldisc = uart_set_ldisc, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2184 | .stop = uart_stop, |
| 2185 | .start = uart_start, |
| 2186 | .hangup = uart_hangup, |
| 2187 | .break_ctl = uart_break_ctl, |
| 2188 | .wait_until_sent= uart_wait_until_sent, |
| 2189 | #ifdef CONFIG_PROC_FS |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 2190 | .proc_fops = &uart_proc_fops, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2191 | #endif |
| 2192 | .tiocmget = uart_tiocmget, |
| 2193 | .tiocmset = uart_tiocmset, |
Alan Cox | d281da7 | 2010-09-16 18:21:24 +0100 | [diff] [blame] | 2194 | .get_icount = uart_get_icount, |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 2195 | #ifdef CONFIG_CONSOLE_POLL |
| 2196 | .poll_init = uart_poll_init, |
| 2197 | .poll_get_char = uart_poll_get_char, |
| 2198 | .poll_put_char = uart_poll_put_char, |
| 2199 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2200 | }; |
| 2201 | |
Alan Cox | de0c8cb | 2010-06-01 22:52:58 +0200 | [diff] [blame] | 2202 | static const struct tty_port_operations uart_port_ops = { |
| 2203 | .carrier_raised = uart_carrier_raised, |
| 2204 | .dtr_rts = uart_dtr_rts, |
| 2205 | }; |
| 2206 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2207 | /** |
| 2208 | * uart_register_driver - register a driver with the uart core layer |
| 2209 | * @drv: low level driver structure |
| 2210 | * |
| 2211 | * Register a uart driver with the core driver. We in turn register |
| 2212 | * with the tty layer, and initialise the core driver per-port state. |
| 2213 | * |
| 2214 | * We have a proc file in /proc/tty/driver which is named after the |
| 2215 | * normal driver. |
| 2216 | * |
| 2217 | * drv->port should be NULL, and the per-port structures should be |
| 2218 | * registered using uart_add_one_port after this call has succeeded. |
| 2219 | */ |
| 2220 | int uart_register_driver(struct uart_driver *drv) |
| 2221 | { |
André Goddard Rosa | 9e845ab | 2009-10-25 11:16:32 -0200 | [diff] [blame] | 2222 | struct tty_driver *normal; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2223 | int i, retval; |
| 2224 | |
| 2225 | BUG_ON(drv->state); |
| 2226 | |
| 2227 | /* |
| 2228 | * Maybe we should be using a slab cache for this, especially if |
| 2229 | * we have a large number of ports to handle. |
| 2230 | */ |
Burman Yan | 8f31bb3 | 2007-02-14 00:33:07 -0800 | [diff] [blame] | 2231 | drv->state = kzalloc(sizeof(struct uart_state) * drv->nr, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2232 | if (!drv->state) |
| 2233 | goto out; |
| 2234 | |
André Goddard Rosa | 9e845ab | 2009-10-25 11:16:32 -0200 | [diff] [blame] | 2235 | normal = alloc_tty_driver(drv->nr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2236 | if (!normal) |
André Goddard Rosa | 9e845ab | 2009-10-25 11:16:32 -0200 | [diff] [blame] | 2237 | goto out_kfree; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2238 | |
| 2239 | drv->tty_driver = normal; |
| 2240 | |
| 2241 | normal->owner = drv->owner; |
| 2242 | normal->driver_name = drv->driver_name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2243 | normal->name = drv->dev_name; |
| 2244 | normal->major = drv->major; |
| 2245 | normal->minor_start = drv->minor; |
| 2246 | normal->type = TTY_DRIVER_TYPE_SERIAL; |
| 2247 | normal->subtype = SERIAL_TYPE_NORMAL; |
| 2248 | normal->init_termios = tty_std_termios; |
| 2249 | normal->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 2250 | normal->init_termios.c_ispeed = normal->init_termios.c_ospeed = 9600; |
Greg Kroah-Hartman | 331b831 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 2251 | normal->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2252 | normal->driver_state = drv; |
| 2253 | tty_set_operations(normal, &uart_ops); |
| 2254 | |
| 2255 | /* |
| 2256 | * Initialise the UART state(s). |
| 2257 | */ |
| 2258 | for (i = 0; i < drv->nr; i++) { |
| 2259 | struct uart_state *state = drv->state + i; |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2260 | struct tty_port *port = &state->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2261 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2262 | tty_port_init(port); |
Alan Cox | de0c8cb | 2010-06-01 22:52:58 +0200 | [diff] [blame] | 2263 | port->ops = &uart_port_ops; |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2264 | port->close_delay = 500; /* .5 seconds */ |
| 2265 | port->closing_wait = 30000; /* 30 seconds */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2266 | } |
| 2267 | |
| 2268 | retval = tty_register_driver(normal); |
André Goddard Rosa | 9e845ab | 2009-10-25 11:16:32 -0200 | [diff] [blame] | 2269 | if (retval >= 0) |
| 2270 | return retval; |
| 2271 | |
| 2272 | put_tty_driver(normal); |
| 2273 | out_kfree: |
| 2274 | kfree(drv->state); |
| 2275 | out: |
| 2276 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2277 | } |
| 2278 | |
| 2279 | /** |
| 2280 | * uart_unregister_driver - remove a driver from the uart core layer |
| 2281 | * @drv: low level driver structure |
| 2282 | * |
| 2283 | * Remove all references to a driver from the core driver. The low |
| 2284 | * level driver must have removed all its ports via the |
| 2285 | * uart_remove_one_port() if it registered them with uart_add_one_port(). |
| 2286 | * (ie, drv->port == NULL) |
| 2287 | */ |
| 2288 | void uart_unregister_driver(struct uart_driver *drv) |
| 2289 | { |
| 2290 | struct tty_driver *p = drv->tty_driver; |
| 2291 | tty_unregister_driver(p); |
| 2292 | put_tty_driver(p); |
| 2293 | kfree(drv->state); |
| 2294 | drv->tty_driver = NULL; |
| 2295 | } |
| 2296 | |
| 2297 | struct tty_driver *uart_console_device(struct console *co, int *index) |
| 2298 | { |
| 2299 | struct uart_driver *p = co->data; |
| 2300 | *index = co->index; |
| 2301 | return p->tty_driver; |
| 2302 | } |
| 2303 | |
| 2304 | /** |
| 2305 | * uart_add_one_port - attach a driver-defined port structure |
| 2306 | * @drv: pointer to the uart low level driver structure for this port |
Randy Dunlap | 1b9894f | 2009-09-21 11:12:03 -0700 | [diff] [blame] | 2307 | * @uport: uart port structure to use for this port. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2308 | * |
| 2309 | * This allows the driver to register its own uart_port structure |
| 2310 | * with the core driver. The main purpose is to allow the low |
| 2311 | * level uart drivers to expand uart_port, rather than having yet |
| 2312 | * more levels of structures. |
| 2313 | */ |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2314 | 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] | 2315 | { |
| 2316 | struct uart_state *state; |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2317 | struct tty_port *port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2318 | int ret = 0; |
Guennadi Liakhovetski | b3b708f | 2007-10-16 01:24:02 -0700 | [diff] [blame] | 2319 | struct device *tty_dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2320 | |
| 2321 | BUG_ON(in_interrupt()); |
| 2322 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2323 | if (uport->line >= drv->nr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2324 | return -EINVAL; |
| 2325 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2326 | state = drv->state + uport->line; |
| 2327 | port = &state->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2328 | |
Arjan van de Ven | f392ecf | 2006-01-12 18:44:32 +0000 | [diff] [blame] | 2329 | mutex_lock(&port_mutex); |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2330 | mutex_lock(&port->mutex); |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 2331 | if (state->uart_port) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2332 | ret = -EINVAL; |
| 2333 | goto out; |
| 2334 | } |
| 2335 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2336 | state->uart_port = uport; |
Russell King | 97d9722 | 2007-09-01 21:25:09 +0100 | [diff] [blame] | 2337 | state->pm_state = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2338 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2339 | uport->cons = drv->cons; |
| 2340 | uport->state = state; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2341 | |
Russell King | 976ecd1 | 2005-07-03 21:05:45 +0100 | [diff] [blame] | 2342 | /* |
| 2343 | * If this port is a console, then the spinlock is already |
| 2344 | * initialised. |
| 2345 | */ |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2346 | if (!(uart_console(uport) && (uport->cons->flags & CON_ENABLED))) { |
| 2347 | spin_lock_init(&uport->lock); |
| 2348 | lockdep_set_class(&uport->lock, &port_lock_key); |
Ingo Molnar | 13e8359 | 2006-07-03 00:25:03 -0700 | [diff] [blame] | 2349 | } |
Russell King | 976ecd1 | 2005-07-03 21:05:45 +0100 | [diff] [blame] | 2350 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2351 | uart_configure_port(drv, state, uport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2352 | |
| 2353 | /* |
| 2354 | * Register the port whether it's detected or not. This allows |
| 2355 | * setserial to be used to alter this ports parameters. |
| 2356 | */ |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2357 | tty_dev = tty_register_device(drv->tty_driver, uport->line, uport->dev); |
Guennadi Liakhovetski | b3b708f | 2007-10-16 01:24:02 -0700 | [diff] [blame] | 2358 | if (likely(!IS_ERR(tty_dev))) { |
Alan Stern | 74081f8 | 2008-03-19 22:35:13 +0100 | [diff] [blame] | 2359 | device_init_wakeup(tty_dev, 1); |
Guennadi Liakhovetski | b3b708f | 2007-10-16 01:24:02 -0700 | [diff] [blame] | 2360 | device_set_wakeup_enable(tty_dev, 0); |
| 2361 | } else |
| 2362 | printk(KERN_ERR "Cannot register tty device on line %d\n", |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2363 | uport->line); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2364 | |
| 2365 | /* |
Russell King | 68ac64c | 2006-04-30 11:13:50 +0100 | [diff] [blame] | 2366 | * Ensure UPF_DEAD is not set. |
| 2367 | */ |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2368 | uport->flags &= ~UPF_DEAD; |
Russell King | 68ac64c | 2006-04-30 11:13:50 +0100 | [diff] [blame] | 2369 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2370 | out: |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2371 | mutex_unlock(&port->mutex); |
Arjan van de Ven | f392ecf | 2006-01-12 18:44:32 +0000 | [diff] [blame] | 2372 | mutex_unlock(&port_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2373 | |
| 2374 | return ret; |
| 2375 | } |
| 2376 | |
| 2377 | /** |
| 2378 | * uart_remove_one_port - detach a driver defined port structure |
| 2379 | * @drv: pointer to the uart low level driver structure for this port |
Randy Dunlap | 1b9894f | 2009-09-21 11:12:03 -0700 | [diff] [blame] | 2380 | * @uport: uart port structure for this port |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2381 | * |
| 2382 | * This unhooks (and hangs up) the specified port structure from the |
| 2383 | * core driver. No further calls will be made to the low-level code |
| 2384 | * for this port. |
| 2385 | */ |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2386 | 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] | 2387 | { |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2388 | struct uart_state *state = drv->state + uport->line; |
| 2389 | struct tty_port *port = &state->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2390 | |
| 2391 | BUG_ON(in_interrupt()); |
| 2392 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2393 | if (state->uart_port != uport) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2394 | printk(KERN_ALERT "Removing wrong port: %p != %p\n", |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2395 | state->uart_port, uport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2396 | |
Arjan van de Ven | f392ecf | 2006-01-12 18:44:32 +0000 | [diff] [blame] | 2397 | mutex_lock(&port_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2398 | |
| 2399 | /* |
Russell King | 68ac64c | 2006-04-30 11:13:50 +0100 | [diff] [blame] | 2400 | * Mark the port "dead" - this prevents any opens from |
| 2401 | * succeeding while we shut down the port. |
| 2402 | */ |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2403 | mutex_lock(&port->mutex); |
| 2404 | uport->flags |= UPF_DEAD; |
| 2405 | mutex_unlock(&port->mutex); |
Russell King | 68ac64c | 2006-04-30 11:13:50 +0100 | [diff] [blame] | 2406 | |
| 2407 | /* |
Greg Kroah-Hartman | aa4148c | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 2408 | * Remove the devices from the tty layer |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2409 | */ |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2410 | tty_unregister_device(drv->tty_driver, uport->line); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2411 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2412 | if (port->tty) |
| 2413 | tty_vhangup(port->tty); |
Russell King | 68ac64c | 2006-04-30 11:13:50 +0100 | [diff] [blame] | 2414 | |
| 2415 | /* |
Russell King | 68ac64c | 2006-04-30 11:13:50 +0100 | [diff] [blame] | 2416 | * Free the port IO and memory resources, if any. |
| 2417 | */ |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2418 | if (uport->type != PORT_UNKNOWN) |
| 2419 | uport->ops->release_port(uport); |
Russell King | 68ac64c | 2006-04-30 11:13:50 +0100 | [diff] [blame] | 2420 | |
| 2421 | /* |
| 2422 | * Indicate that there isn't a port here anymore. |
| 2423 | */ |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2424 | uport->type = PORT_UNKNOWN; |
Russell King | 68ac64c | 2006-04-30 11:13:50 +0100 | [diff] [blame] | 2425 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 2426 | state->uart_port = NULL; |
Arjan van de Ven | f392ecf | 2006-01-12 18:44:32 +0000 | [diff] [blame] | 2427 | mutex_unlock(&port_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2428 | |
| 2429 | return 0; |
| 2430 | } |
| 2431 | |
| 2432 | /* |
| 2433 | * Are the two ports equivalent? |
| 2434 | */ |
| 2435 | int uart_match_port(struct uart_port *port1, struct uart_port *port2) |
| 2436 | { |
| 2437 | if (port1->iotype != port2->iotype) |
| 2438 | return 0; |
| 2439 | |
| 2440 | switch (port1->iotype) { |
| 2441 | case UPIO_PORT: |
| 2442 | return (port1->iobase == port2->iobase); |
| 2443 | case UPIO_HUB6: |
| 2444 | return (port1->iobase == port2->iobase) && |
| 2445 | (port1->hub6 == port2->hub6); |
| 2446 | case UPIO_MEM: |
Sergei Shtylyov | d21b55d | 2006-08-28 19:49:03 +0400 | [diff] [blame] | 2447 | case UPIO_MEM32: |
| 2448 | case UPIO_AU: |
| 2449 | case UPIO_TSI: |
Benjamin Herrenschmidt | 1624f00 | 2006-01-04 18:09:44 +0000 | [diff] [blame] | 2450 | return (port1->mapbase == port2->mapbase); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2451 | } |
| 2452 | return 0; |
| 2453 | } |
| 2454 | EXPORT_SYMBOL(uart_match_port); |
| 2455 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2456 | EXPORT_SYMBOL(uart_write_wakeup); |
| 2457 | EXPORT_SYMBOL(uart_register_driver); |
| 2458 | EXPORT_SYMBOL(uart_unregister_driver); |
| 2459 | EXPORT_SYMBOL(uart_suspend_port); |
| 2460 | EXPORT_SYMBOL(uart_resume_port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2461 | EXPORT_SYMBOL(uart_add_one_port); |
| 2462 | EXPORT_SYMBOL(uart_remove_one_port); |
| 2463 | |
| 2464 | MODULE_DESCRIPTION("Serial driver core"); |
| 2465 | MODULE_LICENSE("GPL"); |