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> |
Jiri Slaby | 027d7da | 2011-11-09 21:33:43 +0100 | [diff] [blame] | 25 | #include <linux/tty_flip.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <linux/slab.h> |
| 27 | #include <linux/init.h> |
| 28 | #include <linux/console.h> |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 29 | #include <linux/proc_fs.h> |
| 30 | #include <linux/seq_file.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #include <linux/device.h> |
| 32 | #include <linux/serial.h> /* for serial_state and serial_icounter_struct */ |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 33 | #include <linux/serial_core.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #include <linux/delay.h> |
Arjan van de Ven | f392ecf | 2006-01-12 18:44:32 +0000 | [diff] [blame] | 35 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | |
| 37 | #include <asm/irq.h> |
| 38 | #include <asm/uaccess.h> |
| 39 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | /* |
| 41 | * This is used to lock changes in serial line configuration. |
| 42 | */ |
Arjan van de Ven | f392ecf | 2006-01-12 18:44:32 +0000 | [diff] [blame] | 43 | static DEFINE_MUTEX(port_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | |
Ingo Molnar | 13e8359 | 2006-07-03 00:25:03 -0700 | [diff] [blame] | 45 | /* |
| 46 | * lockdep: port->lock is initialized in two places, but we |
| 47 | * want only one lock-class: |
| 48 | */ |
| 49 | static struct lock_class_key port_lock_key; |
| 50 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | #define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8) |
| 52 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | #ifdef CONFIG_SERIAL_CORE_CONSOLE |
| 54 | #define uart_console(port) ((port)->cons && (port)->cons->index == (port)->line) |
| 55 | #else |
| 56 | #define uart_console(port) (0) |
| 57 | #endif |
| 58 | |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 59 | 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] | 60 | struct ktermios *old_termios); |
Jiri Slaby | 1f33a51 | 2011-07-14 14:35:10 +0200 | [diff] [blame] | 61 | static void uart_wait_until_sent(struct tty_struct *tty, int timeout); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | static void uart_change_pm(struct uart_state *state, int pm_state); |
| 63 | |
Jiri Slaby | b922e19 | 2011-11-09 21:33:51 +0100 | [diff] [blame] | 64 | static void uart_port_shutdown(struct tty_port *port); |
| 65 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | /* |
| 67 | * This routine is used by the interrupt handler to schedule processing in |
| 68 | * the software interrupt portion of the driver. |
| 69 | */ |
| 70 | void uart_write_wakeup(struct uart_port *port) |
| 71 | { |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 72 | struct uart_state *state = port->state; |
Pavel Machek | d5f735e | 2006-03-07 21:55:20 -0800 | [diff] [blame] | 73 | /* |
| 74 | * This means you called this function _after_ the port was |
| 75 | * closed. No cookie for you. |
| 76 | */ |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 77 | BUG_ON(!state); |
Jiri Slaby | 6a3e492b | 2011-07-14 14:35:12 +0200 | [diff] [blame] | 78 | tty_wakeup(state->port.tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | } |
| 80 | |
| 81 | static void uart_stop(struct tty_struct *tty) |
| 82 | { |
| 83 | struct uart_state *state = tty->driver_data; |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 84 | struct uart_port *port = state->uart_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | unsigned long flags; |
| 86 | |
| 87 | spin_lock_irqsave(&port->lock, flags); |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 88 | port->ops->stop_tx(port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | spin_unlock_irqrestore(&port->lock, flags); |
| 90 | } |
| 91 | |
| 92 | static void __uart_start(struct tty_struct *tty) |
| 93 | { |
| 94 | struct uart_state *state = tty->driver_data; |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 95 | struct uart_port *port = state->uart_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 97 | if (!uart_circ_empty(&state->xmit) && state->xmit.buf && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | !tty->stopped && !tty->hw_stopped) |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 99 | port->ops->start_tx(port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | } |
| 101 | |
| 102 | static void uart_start(struct tty_struct *tty) |
| 103 | { |
| 104 | struct uart_state *state = tty->driver_data; |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 105 | struct uart_port *port = state->uart_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | unsigned long flags; |
| 107 | |
| 108 | spin_lock_irqsave(&port->lock, flags); |
| 109 | __uart_start(tty); |
| 110 | spin_unlock_irqrestore(&port->lock, flags); |
| 111 | } |
| 112 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | static inline void |
| 114 | uart_update_mctrl(struct uart_port *port, unsigned int set, unsigned int clear) |
| 115 | { |
| 116 | unsigned long flags; |
| 117 | unsigned int old; |
| 118 | |
| 119 | spin_lock_irqsave(&port->lock, flags); |
| 120 | old = port->mctrl; |
| 121 | port->mctrl = (old & ~clear) | set; |
| 122 | if (old != port->mctrl) |
| 123 | port->ops->set_mctrl(port, port->mctrl); |
| 124 | spin_unlock_irqrestore(&port->lock, flags); |
| 125 | } |
| 126 | |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 127 | #define uart_set_mctrl(port, set) uart_update_mctrl(port, set, 0) |
| 128 | #define uart_clear_mctrl(port, clear) uart_update_mctrl(port, 0, clear) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | |
| 130 | /* |
| 131 | * Startup the port. This will be called once per open. All calls |
Alan Cox | df4f4dd | 2008-07-16 21:53:50 +0100 | [diff] [blame] | 132 | * will be serialised by the per-port mutex. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | */ |
Jiri Slaby | c0d92be | 2011-11-09 21:34:14 +0100 | [diff] [blame] | 134 | static int uart_port_startup(struct tty_struct *tty, struct uart_state *state, |
| 135 | int init_hw) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | { |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 137 | struct uart_port *uport = state->uart_port; |
| 138 | struct tty_port *port = &state->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | unsigned long page; |
| 140 | int retval = 0; |
| 141 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 142 | if (uport->type == PORT_UNKNOWN) |
Jiri Slaby | c0d92be | 2011-11-09 21:34:14 +0100 | [diff] [blame] | 143 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | |
| 145 | /* |
| 146 | * Initialise and allocate the transmit and temporary |
| 147 | * buffer. |
| 148 | */ |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 149 | if (!state->xmit.buf) { |
Alan Cox | df4f4dd | 2008-07-16 21:53:50 +0100 | [diff] [blame] | 150 | /* This is protected by the per port mutex */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | page = get_zeroed_page(GFP_KERNEL); |
| 152 | if (!page) |
| 153 | return -ENOMEM; |
| 154 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 155 | state->xmit.buf = (unsigned char *) page; |
| 156 | uart_circ_clear(&state->xmit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | } |
| 158 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 159 | retval = uport->ops->startup(uport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | if (retval == 0) { |
Jiri Slaby | c7d7abf | 2011-03-30 00:10:55 +0200 | [diff] [blame] | 161 | if (uart_console(uport) && uport->cons->cflag) { |
Alan Cox | adc8d74 | 2012-07-14 15:31:47 +0100 | [diff] [blame] | 162 | tty->termios.c_cflag = uport->cons->cflag; |
Jiri Slaby | c7d7abf | 2011-03-30 00:10:55 +0200 | [diff] [blame] | 163 | uport->cons->cflag = 0; |
| 164 | } |
| 165 | /* |
| 166 | * Initialise the hardware port settings. |
| 167 | */ |
| 168 | uart_change_speed(tty, state, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | |
Jiri Slaby | c7d7abf | 2011-03-30 00:10:55 +0200 | [diff] [blame] | 170 | if (init_hw) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | /* |
| 172 | * Setup the RTS and DTR signals once the |
| 173 | * port is open and ready to respond. |
| 174 | */ |
Alan Cox | adc8d74 | 2012-07-14 15:31:47 +0100 | [diff] [blame] | 175 | if (tty->termios.c_cflag & CBAUD) |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 176 | uart_set_mctrl(uport, TIOCM_RTS | TIOCM_DTR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | } |
| 178 | |
Huang Shijie | f21ec3d | 2012-08-22 22:13:36 -0400 | [diff] [blame] | 179 | if (tty_port_cts_enabled(port)) { |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 180 | spin_lock_irq(&uport->lock); |
| 181 | if (!(uport->ops->get_mctrl(uport) & TIOCM_CTS)) |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 182 | tty->hw_stopped = 1; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 183 | spin_unlock_irq(&uport->lock); |
Russell King | 0dd7a1a | 2005-06-29 18:40:53 +0100 | [diff] [blame] | 184 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | } |
| 186 | |
Jiri Slaby | 0055197 | 2011-08-17 13:48:15 +0200 | [diff] [blame] | 187 | /* |
| 188 | * This is to allow setserial on this port. People may want to set |
| 189 | * port/irq/type and then reconfigure the port properly if it failed |
| 190 | * now. |
| 191 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | if (retval && capable(CAP_SYS_ADMIN)) |
Jiri Slaby | c0d92be | 2011-11-09 21:34:14 +0100 | [diff] [blame] | 193 | return 1; |
| 194 | |
| 195 | return retval; |
| 196 | } |
| 197 | |
| 198 | static int uart_startup(struct tty_struct *tty, struct uart_state *state, |
| 199 | int init_hw) |
| 200 | { |
| 201 | struct tty_port *port = &state->port; |
| 202 | int retval; |
| 203 | |
| 204 | if (port->flags & ASYNC_INITIALIZED) |
| 205 | return 0; |
| 206 | |
| 207 | /* |
| 208 | * Set the TTY IO error marker - we will only clear this |
| 209 | * once we have successfully opened the port. |
| 210 | */ |
| 211 | set_bit(TTY_IO_ERROR, &tty->flags); |
| 212 | |
| 213 | retval = uart_port_startup(tty, state, init_hw); |
| 214 | if (!retval) { |
| 215 | set_bit(ASYNCB_INITIALIZED, &port->flags); |
| 216 | clear_bit(TTY_IO_ERROR, &tty->flags); |
| 217 | } else if (retval > 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | retval = 0; |
| 219 | |
| 220 | return retval; |
| 221 | } |
| 222 | |
| 223 | /* |
| 224 | * This routine will shutdown a serial port; interrupts are disabled, and |
| 225 | * DTR is dropped if the hangup on close termio flag is on. Calls to |
| 226 | * uart_shutdown are serialised by the per-port semaphore. |
| 227 | */ |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 228 | static void uart_shutdown(struct tty_struct *tty, struct uart_state *state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | { |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 230 | struct uart_port *uport = state->uart_port; |
Alan Cox | bdc04e3 | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 231 | struct tty_port *port = &state->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | |
Russell King | ee31b33 | 2005-11-13 15:28:51 +0000 | [diff] [blame] | 233 | /* |
| 234 | * Set the TTY IO error marker |
| 235 | */ |
Alan Cox | f751928 | 2009-01-02 13:49:21 +0000 | [diff] [blame] | 236 | if (tty) |
| 237 | set_bit(TTY_IO_ERROR, &tty->flags); |
Russell King | ee31b33 | 2005-11-13 15:28:51 +0000 | [diff] [blame] | 238 | |
Alan Cox | bdc04e3 | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 239 | if (test_and_clear_bit(ASYNCB_INITIALIZED, &port->flags)) { |
Russell King | ee31b33 | 2005-11-13 15:28:51 +0000 | [diff] [blame] | 240 | /* |
| 241 | * Turn off DTR and RTS early. |
| 242 | */ |
Alan Cox | adc8d74 | 2012-07-14 15:31:47 +0100 | [diff] [blame] | 243 | if (!tty || (tty->termios.c_cflag & HUPCL)) |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 244 | uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); |
Russell King | ee31b33 | 2005-11-13 15:28:51 +0000 | [diff] [blame] | 245 | |
Jiri Slaby | b922e19 | 2011-11-09 21:33:51 +0100 | [diff] [blame] | 246 | uart_port_shutdown(port); |
Russell King | ee31b33 | 2005-11-13 15:28:51 +0000 | [diff] [blame] | 247 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | |
| 249 | /* |
Doug Anderson | d208a3b | 2011-10-19 11:52:01 -0700 | [diff] [blame] | 250 | * It's possible for shutdown to be called after suspend if we get |
| 251 | * a DCD drop (hangup) at just the right time. Clear suspended bit so |
| 252 | * we don't try to resume a port that has been shutdown. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | */ |
Doug Anderson | d208a3b | 2011-10-19 11:52:01 -0700 | [diff] [blame] | 254 | clear_bit(ASYNCB_SUSPENDED, &port->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | |
| 256 | /* |
| 257 | * Free the transmit buffer page. |
| 258 | */ |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 259 | if (state->xmit.buf) { |
| 260 | free_page((unsigned long)state->xmit.buf); |
| 261 | state->xmit.buf = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | } |
| 264 | |
| 265 | /** |
| 266 | * uart_update_timeout - update per-port FIFO timeout. |
| 267 | * @port: uart_port structure describing the port |
| 268 | * @cflag: termios cflag value |
| 269 | * @baud: speed of the port |
| 270 | * |
| 271 | * Set the port FIFO timeout value. The @cflag value should |
| 272 | * reflect the actual hardware settings. |
| 273 | */ |
| 274 | void |
| 275 | uart_update_timeout(struct uart_port *port, unsigned int cflag, |
| 276 | unsigned int baud) |
| 277 | { |
| 278 | unsigned int bits; |
| 279 | |
| 280 | /* byte size and parity */ |
| 281 | switch (cflag & CSIZE) { |
| 282 | case CS5: |
| 283 | bits = 7; |
| 284 | break; |
| 285 | case CS6: |
| 286 | bits = 8; |
| 287 | break; |
| 288 | case CS7: |
| 289 | bits = 9; |
| 290 | break; |
| 291 | default: |
| 292 | bits = 10; |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 293 | break; /* CS8 */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | } |
| 295 | |
| 296 | if (cflag & CSTOPB) |
| 297 | bits++; |
| 298 | if (cflag & PARENB) |
| 299 | bits++; |
| 300 | |
| 301 | /* |
| 302 | * The total number of bits to be transmitted in the fifo. |
| 303 | */ |
| 304 | bits = bits * port->fifosize; |
| 305 | |
| 306 | /* |
| 307 | * Figure the timeout to send the above number of bits. |
| 308 | * Add .02 seconds of slop |
| 309 | */ |
| 310 | port->timeout = (HZ * bits) / baud + HZ/50; |
| 311 | } |
| 312 | |
| 313 | EXPORT_SYMBOL(uart_update_timeout); |
| 314 | |
| 315 | /** |
| 316 | * uart_get_baud_rate - return baud rate for a particular port |
| 317 | * @port: uart_port structure describing the port in question. |
| 318 | * @termios: desired termios settings. |
| 319 | * @old: old termios (or NULL) |
| 320 | * @min: minimum acceptable baud rate |
| 321 | * @max: maximum acceptable baud rate |
| 322 | * |
| 323 | * Decode the termios structure into a numeric baud rate, |
| 324 | * taking account of the magic 38400 baud rate (with spd_* |
| 325 | * flags), and mapping the %B0 rate to 9600 baud. |
| 326 | * |
| 327 | * If the new baud rate is invalid, try the old termios setting. |
| 328 | * If it's still invalid, we try 9600 baud. |
| 329 | * |
| 330 | * Update the @termios structure to reflect the baud rate |
Alan Cox | eb424fd | 2008-04-28 02:14:07 -0700 | [diff] [blame] | 331 | * we're actually going to be using. Don't do this for the case |
| 332 | * where B0 is requested ("hang up"). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | */ |
| 334 | unsigned int |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 335 | uart_get_baud_rate(struct uart_port *port, struct ktermios *termios, |
| 336 | struct ktermios *old, unsigned int min, unsigned int max) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | { |
| 338 | unsigned int try, baud, altbaud = 38400; |
Alan Cox | eb424fd | 2008-04-28 02:14:07 -0700 | [diff] [blame] | 339 | int hung_up = 0; |
Russell King | 0077d45 | 2006-01-21 23:03:28 +0000 | [diff] [blame] | 340 | upf_t flags = port->flags & UPF_SPD_MASK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | |
| 342 | if (flags == UPF_SPD_HI) |
| 343 | altbaud = 57600; |
André Goddard Rosa | 82cb7ba | 2009-10-25 11:18:26 -0200 | [diff] [blame] | 344 | else if (flags == UPF_SPD_VHI) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | altbaud = 115200; |
André Goddard Rosa | 82cb7ba | 2009-10-25 11:18:26 -0200 | [diff] [blame] | 346 | else if (flags == UPF_SPD_SHI) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | altbaud = 230400; |
André Goddard Rosa | 82cb7ba | 2009-10-25 11:18:26 -0200 | [diff] [blame] | 348 | else if (flags == UPF_SPD_WARP) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | altbaud = 460800; |
| 350 | |
| 351 | for (try = 0; try < 2; try++) { |
| 352 | baud = tty_termios_baud_rate(termios); |
| 353 | |
| 354 | /* |
| 355 | * The spd_hi, spd_vhi, spd_shi, spd_warp kludge... |
| 356 | * Die! Die! Die! |
| 357 | */ |
| 358 | if (baud == 38400) |
| 359 | baud = altbaud; |
| 360 | |
| 361 | /* |
| 362 | * Special case: B0 rate. |
| 363 | */ |
Alan Cox | eb424fd | 2008-04-28 02:14:07 -0700 | [diff] [blame] | 364 | if (baud == 0) { |
| 365 | hung_up = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | baud = 9600; |
Alan Cox | eb424fd | 2008-04-28 02:14:07 -0700 | [diff] [blame] | 367 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | |
| 369 | if (baud >= min && baud <= max) |
| 370 | return baud; |
| 371 | |
| 372 | /* |
| 373 | * Oops, the quotient was zero. Try again with |
| 374 | * the old baud rate if possible. |
| 375 | */ |
| 376 | termios->c_cflag &= ~CBAUD; |
| 377 | if (old) { |
Alan Cox | 6d4d67b | 2008-02-04 22:27:53 -0800 | [diff] [blame] | 378 | baud = tty_termios_baud_rate(old); |
Alan Cox | eb424fd | 2008-04-28 02:14:07 -0700 | [diff] [blame] | 379 | if (!hung_up) |
| 380 | tty_termios_encode_baud_rate(termios, |
| 381 | baud, baud); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | old = NULL; |
| 383 | continue; |
| 384 | } |
| 385 | |
| 386 | /* |
Alan Cox | 16ae2a8 | 2010-01-04 16:26:21 +0000 | [diff] [blame] | 387 | * As a last resort, if the range cannot be met then clip to |
| 388 | * the nearest chip supported rate. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | */ |
Alan Cox | 16ae2a8 | 2010-01-04 16:26:21 +0000 | [diff] [blame] | 390 | if (!hung_up) { |
| 391 | if (baud <= min) |
| 392 | tty_termios_encode_baud_rate(termios, |
| 393 | min + 1, min + 1); |
| 394 | else |
| 395 | tty_termios_encode_baud_rate(termios, |
| 396 | max - 1, max - 1); |
| 397 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | } |
Alan Cox | 16ae2a8 | 2010-01-04 16:26:21 +0000 | [diff] [blame] | 399 | /* Should never happen */ |
| 400 | WARN_ON(1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | return 0; |
| 402 | } |
| 403 | |
| 404 | EXPORT_SYMBOL(uart_get_baud_rate); |
| 405 | |
| 406 | /** |
| 407 | * uart_get_divisor - return uart clock divisor |
| 408 | * @port: uart_port structure describing the port. |
| 409 | * @baud: desired baud rate |
| 410 | * |
| 411 | * Calculate the uart clock divisor for the port. |
| 412 | */ |
| 413 | unsigned int |
| 414 | uart_get_divisor(struct uart_port *port, unsigned int baud) |
| 415 | { |
| 416 | unsigned int quot; |
| 417 | |
| 418 | /* |
| 419 | * Old custom speed handling. |
| 420 | */ |
| 421 | if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) |
| 422 | quot = port->custom_divisor; |
| 423 | else |
Uwe Kleine-König | 97d2463 | 2011-12-20 11:47:44 +0100 | [diff] [blame] | 424 | quot = DIV_ROUND_CLOSEST(port->uartclk, 16 * baud); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | |
| 426 | return quot; |
| 427 | } |
| 428 | |
| 429 | EXPORT_SYMBOL(uart_get_divisor); |
| 430 | |
Alan Cox | 23d22ce | 2008-04-30 00:54:11 -0700 | [diff] [blame] | 431 | /* FIXME: Consistent locking policy */ |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 432 | static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, |
| 433 | struct ktermios *old_termios) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | { |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 435 | struct tty_port *port = &state->port; |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 436 | struct uart_port *uport = state->uart_port; |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 437 | struct ktermios *termios; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | |
| 439 | /* |
| 440 | * If we have no tty, termios, or the port does not exist, |
| 441 | * then we can't set the parameters for this port. |
| 442 | */ |
Alan Cox | adc8d74 | 2012-07-14 15:31:47 +0100 | [diff] [blame] | 443 | if (!tty || uport->type == PORT_UNKNOWN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | return; |
| 445 | |
Alan Cox | adc8d74 | 2012-07-14 15:31:47 +0100 | [diff] [blame] | 446 | termios = &tty->termios; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | |
| 448 | /* |
| 449 | * Set flags based on termios cflag |
| 450 | */ |
| 451 | if (termios->c_cflag & CRTSCTS) |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 452 | set_bit(ASYNCB_CTS_FLOW, &port->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | else |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 454 | clear_bit(ASYNCB_CTS_FLOW, &port->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | |
| 456 | if (termios->c_cflag & CLOCAL) |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 457 | clear_bit(ASYNCB_CHECK_CD, &port->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | else |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 459 | set_bit(ASYNCB_CHECK_CD, &port->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 461 | uport->ops->set_termios(uport, termios, old_termios); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | } |
| 463 | |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 464 | static inline int __uart_put_char(struct uart_port *port, |
| 465 | struct circ_buf *circ, unsigned char c) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | { |
| 467 | unsigned long flags; |
Alan Cox | 23d22ce | 2008-04-30 00:54:11 -0700 | [diff] [blame] | 468 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | |
| 470 | if (!circ->buf) |
Alan Cox | 23d22ce | 2008-04-30 00:54:11 -0700 | [diff] [blame] | 471 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | |
| 473 | spin_lock_irqsave(&port->lock, flags); |
| 474 | if (uart_circ_chars_free(circ) != 0) { |
| 475 | circ->buf[circ->head] = c; |
| 476 | circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1); |
Alan Cox | 23d22ce | 2008-04-30 00:54:11 -0700 | [diff] [blame] | 477 | ret = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | } |
| 479 | spin_unlock_irqrestore(&port->lock, flags); |
Alan Cox | 23d22ce | 2008-04-30 00:54:11 -0700 | [diff] [blame] | 480 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | } |
| 482 | |
Alan Cox | 23d22ce | 2008-04-30 00:54:11 -0700 | [diff] [blame] | 483 | static int uart_put_char(struct tty_struct *tty, unsigned char ch) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | { |
| 485 | struct uart_state *state = tty->driver_data; |
| 486 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 487 | return __uart_put_char(state->uart_port, &state->xmit, ch); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | } |
| 489 | |
| 490 | static void uart_flush_chars(struct tty_struct *tty) |
| 491 | { |
| 492 | uart_start(tty); |
| 493 | } |
| 494 | |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 495 | static int uart_write(struct tty_struct *tty, |
| 496 | const unsigned char *buf, int count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | { |
| 498 | struct uart_state *state = tty->driver_data; |
Pavel Machek | d5f735e | 2006-03-07 21:55:20 -0800 | [diff] [blame] | 499 | struct uart_port *port; |
| 500 | struct circ_buf *circ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | unsigned long flags; |
| 502 | int c, ret = 0; |
| 503 | |
Pavel Machek | d5f735e | 2006-03-07 21:55:20 -0800 | [diff] [blame] | 504 | /* |
| 505 | * This means you called this function _after_ the port was |
| 506 | * closed. No cookie for you. |
| 507 | */ |
Alan Cox | f751928 | 2009-01-02 13:49:21 +0000 | [diff] [blame] | 508 | if (!state) { |
Pavel Machek | d5f735e | 2006-03-07 21:55:20 -0800 | [diff] [blame] | 509 | WARN_ON(1); |
| 510 | return -EL3HLT; |
| 511 | } |
| 512 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 513 | port = state->uart_port; |
| 514 | circ = &state->xmit; |
Pavel Machek | d5f735e | 2006-03-07 21:55:20 -0800 | [diff] [blame] | 515 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | if (!circ->buf) |
| 517 | return 0; |
| 518 | |
| 519 | spin_lock_irqsave(&port->lock, flags); |
| 520 | while (1) { |
| 521 | c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE); |
| 522 | if (count < c) |
| 523 | c = count; |
| 524 | if (c <= 0) |
| 525 | break; |
| 526 | memcpy(circ->buf + circ->head, buf, c); |
| 527 | circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1); |
| 528 | buf += c; |
| 529 | count -= c; |
| 530 | ret += c; |
| 531 | } |
| 532 | spin_unlock_irqrestore(&port->lock, flags); |
| 533 | |
| 534 | uart_start(tty); |
| 535 | return ret; |
| 536 | } |
| 537 | |
| 538 | static int uart_write_room(struct tty_struct *tty) |
| 539 | { |
| 540 | struct uart_state *state = tty->driver_data; |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 541 | unsigned long flags; |
| 542 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 544 | spin_lock_irqsave(&state->uart_port->lock, flags); |
| 545 | ret = uart_circ_chars_free(&state->xmit); |
| 546 | spin_unlock_irqrestore(&state->uart_port->lock, flags); |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 547 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | } |
| 549 | |
| 550 | static int uart_chars_in_buffer(struct tty_struct *tty) |
| 551 | { |
| 552 | struct uart_state *state = tty->driver_data; |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 553 | unsigned long flags; |
| 554 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 556 | spin_lock_irqsave(&state->uart_port->lock, flags); |
| 557 | ret = uart_circ_chars_pending(&state->xmit); |
| 558 | spin_unlock_irqrestore(&state->uart_port->lock, flags); |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 559 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | } |
| 561 | |
| 562 | static void uart_flush_buffer(struct tty_struct *tty) |
| 563 | { |
| 564 | struct uart_state *state = tty->driver_data; |
Tetsuo Handa | 55d7b68 | 2008-05-06 20:42:27 -0700 | [diff] [blame] | 565 | struct uart_port *port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | unsigned long flags; |
| 567 | |
Pavel Machek | d5f735e | 2006-03-07 21:55:20 -0800 | [diff] [blame] | 568 | /* |
| 569 | * This means you called this function _after_ the port was |
| 570 | * closed. No cookie for you. |
| 571 | */ |
Alan Cox | f751928 | 2009-01-02 13:49:21 +0000 | [diff] [blame] | 572 | if (!state) { |
Pavel Machek | d5f735e | 2006-03-07 21:55:20 -0800 | [diff] [blame] | 573 | WARN_ON(1); |
| 574 | return; |
| 575 | } |
| 576 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 577 | port = state->uart_port; |
Jiri Slaby | eb3a1e1 | 2007-05-06 14:48:52 -0700 | [diff] [blame] | 578 | pr_debug("uart_flush_buffer(%d) called\n", tty->index); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | |
| 580 | spin_lock_irqsave(&port->lock, flags); |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 581 | uart_circ_clear(&state->xmit); |
Haavard Skinnemoen | 6bb0e3a | 2008-07-16 21:52:36 +0100 | [diff] [blame] | 582 | if (port->ops->flush_buffer) |
| 583 | port->ops->flush_buffer(port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | spin_unlock_irqrestore(&port->lock, flags); |
| 585 | tty_wakeup(tty); |
| 586 | } |
| 587 | |
| 588 | /* |
| 589 | * This function is used to send a high-priority XON/XOFF character to |
| 590 | * the device |
| 591 | */ |
| 592 | static void uart_send_xchar(struct tty_struct *tty, char ch) |
| 593 | { |
| 594 | struct uart_state *state = tty->driver_data; |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 595 | struct uart_port *port = state->uart_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | unsigned long flags; |
| 597 | |
| 598 | if (port->ops->send_xchar) |
| 599 | port->ops->send_xchar(port, ch); |
| 600 | else { |
| 601 | port->x_char = ch; |
| 602 | if (ch) { |
| 603 | spin_lock_irqsave(&port->lock, flags); |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 604 | port->ops->start_tx(port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | spin_unlock_irqrestore(&port->lock, flags); |
| 606 | } |
| 607 | } |
| 608 | } |
| 609 | |
| 610 | static void uart_throttle(struct tty_struct *tty) |
| 611 | { |
| 612 | struct uart_state *state = tty->driver_data; |
| 613 | |
| 614 | if (I_IXOFF(tty)) |
| 615 | uart_send_xchar(tty, STOP_CHAR(tty)); |
| 616 | |
Alan Cox | adc8d74 | 2012-07-14 15:31:47 +0100 | [diff] [blame] | 617 | if (tty->termios.c_cflag & CRTSCTS) |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 618 | uart_clear_mctrl(state->uart_port, TIOCM_RTS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | } |
| 620 | |
| 621 | static void uart_unthrottle(struct tty_struct *tty) |
| 622 | { |
| 623 | struct uart_state *state = tty->driver_data; |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 624 | struct uart_port *port = state->uart_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | |
| 626 | if (I_IXOFF(tty)) { |
| 627 | if (port->x_char) |
| 628 | port->x_char = 0; |
| 629 | else |
| 630 | uart_send_xchar(tty, START_CHAR(tty)); |
| 631 | } |
| 632 | |
Alan Cox | adc8d74 | 2012-07-14 15:31:47 +0100 | [diff] [blame] | 633 | if (tty->termios.c_cflag & CRTSCTS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | uart_set_mctrl(port, TIOCM_RTS); |
| 635 | } |
| 636 | |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 637 | static void uart_get_info(struct tty_port *port, |
| 638 | struct uart_state *state, |
| 639 | struct serial_struct *retinfo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | { |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 641 | struct uart_port *uport = state->uart_port; |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 642 | |
Fengguang Wu | 37cd0c9 | 2012-09-06 10:27:51 +0800 | [diff] [blame] | 643 | memset(retinfo, 0, sizeof(*retinfo)); |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 644 | |
| 645 | retinfo->type = uport->type; |
| 646 | retinfo->line = uport->line; |
| 647 | retinfo->port = uport->iobase; |
| 648 | if (HIGH_BITS_OFFSET) |
| 649 | retinfo->port_high = (long) uport->iobase >> HIGH_BITS_OFFSET; |
| 650 | retinfo->irq = uport->irq; |
| 651 | retinfo->flags = uport->flags; |
| 652 | retinfo->xmit_fifo_size = uport->fifosize; |
| 653 | retinfo->baud_base = uport->uartclk / 16; |
| 654 | retinfo->close_delay = jiffies_to_msecs(port->close_delay) / 10; |
| 655 | retinfo->closing_wait = port->closing_wait == ASYNC_CLOSING_WAIT_NONE ? |
| 656 | ASYNC_CLOSING_WAIT_NONE : |
| 657 | jiffies_to_msecs(port->closing_wait) / 10; |
| 658 | retinfo->custom_divisor = uport->custom_divisor; |
| 659 | retinfo->hub6 = uport->hub6; |
| 660 | retinfo->io_type = uport->iotype; |
| 661 | retinfo->iomem_reg_shift = uport->regshift; |
| 662 | retinfo->iomem_base = (void *)(unsigned long)uport->mapbase; |
| 663 | } |
| 664 | |
| 665 | static int uart_get_info_user(struct uart_state *state, |
| 666 | struct serial_struct __user *retinfo) |
| 667 | { |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 668 | struct tty_port *port = &state->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | struct serial_struct tmp; |
| 670 | |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 671 | /* Ensure the state we copy is consistent and no hardware changes |
| 672 | occur as we go */ |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 673 | mutex_lock(&port->mutex); |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 674 | uart_get_info(port, state, &tmp); |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 675 | mutex_unlock(&port->mutex); |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 676 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) |
| 678 | return -EFAULT; |
| 679 | return 0; |
| 680 | } |
| 681 | |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 682 | static int uart_set_info(struct tty_struct *tty, struct tty_port *port, |
| 683 | struct uart_state *state, |
| 684 | struct serial_struct *new_info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | { |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 686 | struct uart_port *uport = state->uart_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | unsigned long new_port; |
Russell King | 0077d45 | 2006-01-21 23:03:28 +0000 | [diff] [blame] | 688 | unsigned int change_irq, change_port, closing_wait; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | unsigned int old_custom_divisor, close_delay; |
Russell King | 0077d45 | 2006-01-21 23:03:28 +0000 | [diff] [blame] | 690 | upf_t old_flags, new_flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | int retval = 0; |
| 692 | |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 693 | new_port = new_info->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 694 | if (HIGH_BITS_OFFSET) |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 695 | new_port += (unsigned long) new_info->port_high << HIGH_BITS_OFFSET; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 697 | new_info->irq = irq_canonicalize(new_info->irq); |
| 698 | close_delay = msecs_to_jiffies(new_info->close_delay * 10); |
| 699 | closing_wait = new_info->closing_wait == ASYNC_CLOSING_WAIT_NONE ? |
Jiri Slaby | 4cb0fbf | 2011-11-09 21:33:45 +0100 | [diff] [blame] | 700 | ASYNC_CLOSING_WAIT_NONE : |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 701 | msecs_to_jiffies(new_info->closing_wait * 10); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 704 | change_irq = !(uport->flags & UPF_FIXED_PORT) |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 705 | && new_info->irq != uport->irq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | |
| 707 | /* |
| 708 | * Since changing the 'type' of the port changes its resource |
| 709 | * allocations, we should treat type changes the same as |
| 710 | * IO port changes. |
| 711 | */ |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 712 | change_port = !(uport->flags & UPF_FIXED_PORT) |
| 713 | && (new_port != uport->iobase || |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 714 | (unsigned long)new_info->iomem_base != uport->mapbase || |
| 715 | new_info->hub6 != uport->hub6 || |
| 716 | new_info->io_type != uport->iotype || |
| 717 | new_info->iomem_reg_shift != uport->regshift || |
| 718 | new_info->type != uport->type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 720 | old_flags = uport->flags; |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 721 | new_flags = new_info->flags; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 722 | old_custom_divisor = uport->custom_divisor; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | |
| 724 | if (!capable(CAP_SYS_ADMIN)) { |
| 725 | retval = -EPERM; |
| 726 | if (change_irq || change_port || |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 727 | (new_info->baud_base != uport->uartclk / 16) || |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 728 | (close_delay != port->close_delay) || |
| 729 | (closing_wait != port->closing_wait) || |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 730 | (new_info->xmit_fifo_size && |
| 731 | new_info->xmit_fifo_size != uport->fifosize) || |
Russell King | 0077d45 | 2006-01-21 23:03:28 +0000 | [diff] [blame] | 732 | (((new_flags ^ old_flags) & ~UPF_USR_MASK) != 0)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | goto exit; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 734 | uport->flags = ((uport->flags & ~UPF_USR_MASK) | |
Russell King | 0077d45 | 2006-01-21 23:03:28 +0000 | [diff] [blame] | 735 | (new_flags & UPF_USR_MASK)); |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 736 | uport->custom_divisor = new_info->custom_divisor; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | goto check_and_exit; |
| 738 | } |
| 739 | |
| 740 | /* |
| 741 | * Ask the low level driver to verify the settings. |
| 742 | */ |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 743 | if (uport->ops->verify_port) |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 744 | retval = uport->ops->verify_port(uport, new_info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 746 | if ((new_info->irq >= nr_irqs) || (new_info->irq < 0) || |
| 747 | (new_info->baud_base < 9600)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | retval = -EINVAL; |
| 749 | |
| 750 | if (retval) |
| 751 | goto exit; |
| 752 | |
| 753 | if (change_port || change_irq) { |
| 754 | retval = -EBUSY; |
| 755 | |
| 756 | /* |
| 757 | * Make sure that we are the sole user of this port. |
| 758 | */ |
Alan Cox | b58d13a | 2009-09-19 13:13:32 -0700 | [diff] [blame] | 759 | if (tty_port_users(port) > 1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | goto exit; |
| 761 | |
| 762 | /* |
| 763 | * We need to shutdown the serial port at the old |
| 764 | * port/type/irq combination. |
| 765 | */ |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 766 | uart_shutdown(tty, state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 767 | } |
| 768 | |
| 769 | if (change_port) { |
| 770 | unsigned long old_iobase, old_mapbase; |
| 771 | unsigned int old_type, old_iotype, old_hub6, old_shift; |
| 772 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 773 | old_iobase = uport->iobase; |
| 774 | old_mapbase = uport->mapbase; |
| 775 | old_type = uport->type; |
| 776 | old_hub6 = uport->hub6; |
| 777 | old_iotype = uport->iotype; |
| 778 | old_shift = uport->regshift; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | |
| 780 | /* |
| 781 | * Free and release old regions |
| 782 | */ |
| 783 | if (old_type != PORT_UNKNOWN) |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 784 | uport->ops->release_port(uport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 786 | uport->iobase = new_port; |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 787 | uport->type = new_info->type; |
| 788 | uport->hub6 = new_info->hub6; |
| 789 | uport->iotype = new_info->io_type; |
| 790 | uport->regshift = new_info->iomem_reg_shift; |
| 791 | uport->mapbase = (unsigned long)new_info->iomem_base; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | |
| 793 | /* |
| 794 | * Claim and map the new regions |
| 795 | */ |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 796 | if (uport->type != PORT_UNKNOWN) { |
| 797 | retval = uport->ops->request_port(uport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | } else { |
| 799 | /* Always success - Jean II */ |
| 800 | retval = 0; |
| 801 | } |
| 802 | |
| 803 | /* |
| 804 | * If we fail to request resources for the |
| 805 | * new port, try to restore the old settings. |
| 806 | */ |
| 807 | if (retval && old_type != PORT_UNKNOWN) { |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 808 | uport->iobase = old_iobase; |
| 809 | uport->type = old_type; |
| 810 | uport->hub6 = old_hub6; |
| 811 | uport->iotype = old_iotype; |
| 812 | uport->regshift = old_shift; |
| 813 | uport->mapbase = old_mapbase; |
| 814 | retval = uport->ops->request_port(uport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | /* |
| 816 | * If we failed to restore the old settings, |
| 817 | * we fail like this. |
| 818 | */ |
| 819 | if (retval) |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 820 | uport->type = PORT_UNKNOWN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | |
| 822 | /* |
| 823 | * We failed anyway. |
| 824 | */ |
| 825 | retval = -EBUSY; |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 826 | /* Added to return the correct error -Ram Gupta */ |
| 827 | goto exit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | } |
| 829 | } |
| 830 | |
David Gibson | abb4a23 | 2007-05-06 14:48:49 -0700 | [diff] [blame] | 831 | if (change_irq) |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 832 | uport->irq = new_info->irq; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 833 | if (!(uport->flags & UPF_FIXED_PORT)) |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 834 | uport->uartclk = new_info->baud_base * 16; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 835 | uport->flags = (uport->flags & ~UPF_CHANGE_MASK) | |
Russell King | 0077d45 | 2006-01-21 23:03:28 +0000 | [diff] [blame] | 836 | (new_flags & UPF_CHANGE_MASK); |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 837 | uport->custom_divisor = new_info->custom_divisor; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 838 | port->close_delay = close_delay; |
| 839 | port->closing_wait = closing_wait; |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 840 | if (new_info->xmit_fifo_size) |
| 841 | uport->fifosize = new_info->xmit_fifo_size; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 842 | if (port->tty) |
| 843 | port->tty->low_latency = |
| 844 | (uport->flags & UPF_LOW_LATENCY) ? 1 : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | |
| 846 | check_and_exit: |
| 847 | retval = 0; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 848 | if (uport->type == PORT_UNKNOWN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | goto exit; |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 850 | if (port->flags & ASYNC_INITIALIZED) { |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 851 | if (((old_flags ^ uport->flags) & UPF_SPD_MASK) || |
| 852 | old_custom_divisor != uport->custom_divisor) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | /* |
| 854 | * If they're setting up a custom divisor or speed, |
| 855 | * instead of clearing it, then bitch about it. No |
| 856 | * need to rate-limit; it's CAP_SYS_ADMIN only. |
| 857 | */ |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 858 | if (uport->flags & UPF_SPD_MASK) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | char buf[64]; |
| 860 | printk(KERN_NOTICE |
| 861 | "%s sets custom speed on %s. This " |
| 862 | "is deprecated.\n", current->comm, |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 863 | tty_name(port->tty, buf)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | } |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 865 | uart_change_speed(tty, state, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 866 | } |
| 867 | } else |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 868 | retval = uart_startup(tty, state, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | exit: |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 870 | return retval; |
| 871 | } |
| 872 | |
| 873 | static int uart_set_info_user(struct tty_struct *tty, struct uart_state *state, |
| 874 | struct serial_struct __user *newinfo) |
| 875 | { |
| 876 | struct serial_struct new_serial; |
| 877 | struct tty_port *port = &state->port; |
| 878 | int retval; |
| 879 | |
| 880 | if (copy_from_user(&new_serial, newinfo, sizeof(new_serial))) |
| 881 | return -EFAULT; |
| 882 | |
| 883 | /* |
| 884 | * This semaphore protects port->count. It is also |
| 885 | * very useful to prevent opens. Also, take the |
| 886 | * port configuration semaphore to make sure that a |
| 887 | * module insertion/removal doesn't change anything |
| 888 | * under us. |
| 889 | */ |
| 890 | mutex_lock(&port->mutex); |
| 891 | retval = uart_set_info(tty, port, state, &new_serial); |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 892 | mutex_unlock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 893 | return retval; |
| 894 | } |
| 895 | |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 896 | /** |
| 897 | * uart_get_lsr_info - get line status register info |
| 898 | * @tty: tty associated with the UART |
| 899 | * @state: UART being queried |
| 900 | * @value: returned modem value |
| 901 | * |
| 902 | * Note: uart_ioctl protects us against hangups. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 903 | */ |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 904 | static int uart_get_lsr_info(struct tty_struct *tty, |
| 905 | struct uart_state *state, unsigned int __user *value) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | { |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 907 | struct uart_port *uport = state->uart_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | unsigned int result; |
| 909 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 910 | result = uport->ops->tx_empty(uport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 911 | |
| 912 | /* |
| 913 | * If we're about to load something into the transmit |
| 914 | * register, we'll pretend the transmitter isn't empty to |
| 915 | * avoid a race condition (depending on when the transmit |
| 916 | * interrupt happens). |
| 917 | */ |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 918 | if (uport->x_char || |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 919 | ((uart_circ_chars_pending(&state->xmit) > 0) && |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 920 | !tty->stopped && !tty->hw_stopped)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 921 | result &= ~TIOCSER_TEMT; |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 922 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 923 | return put_user(result, value); |
| 924 | } |
| 925 | |
Alan Cox | 60b33c1 | 2011-02-14 16:26:14 +0000 | [diff] [blame] | 926 | static int uart_tiocmget(struct tty_struct *tty) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | { |
| 928 | struct uart_state *state = tty->driver_data; |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 929 | struct tty_port *port = &state->port; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 930 | struct uart_port *uport = state->uart_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 931 | int result = -EIO; |
| 932 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 933 | mutex_lock(&port->mutex); |
Alan Cox | 60b33c1 | 2011-02-14 16:26:14 +0000 | [diff] [blame] | 934 | if (!(tty->flags & (1 << TTY_IO_ERROR))) { |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 935 | result = uport->mctrl; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 936 | spin_lock_irq(&uport->lock); |
| 937 | result |= uport->ops->get_mctrl(uport); |
| 938 | spin_unlock_irq(&uport->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | } |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 940 | mutex_unlock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 941 | |
| 942 | return result; |
| 943 | } |
| 944 | |
| 945 | static int |
Alan Cox | 20b9d17 | 2011-02-14 16:26:50 +0000 | [diff] [blame] | 946 | uart_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 947 | { |
| 948 | struct uart_state *state = tty->driver_data; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 949 | struct uart_port *uport = state->uart_port; |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 950 | struct tty_port *port = &state->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 951 | int ret = -EIO; |
| 952 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 953 | mutex_lock(&port->mutex); |
Alan Cox | 20b9d17 | 2011-02-14 16:26:50 +0000 | [diff] [blame] | 954 | if (!(tty->flags & (1 << TTY_IO_ERROR))) { |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 955 | uart_update_mctrl(uport, set, clear); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 956 | ret = 0; |
| 957 | } |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 958 | mutex_unlock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | return ret; |
| 960 | } |
| 961 | |
Alan Cox | 9e98966 | 2008-07-22 11:18:03 +0100 | [diff] [blame] | 962 | static int uart_break_ctl(struct tty_struct *tty, int break_state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | { |
| 964 | struct uart_state *state = tty->driver_data; |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 965 | struct tty_port *port = &state->port; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 966 | struct uart_port *uport = state->uart_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 967 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 968 | mutex_lock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 969 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 970 | if (uport->type != PORT_UNKNOWN) |
| 971 | uport->ops->break_ctl(uport, break_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 973 | mutex_unlock(&port->mutex); |
Alan Cox | 9e98966 | 2008-07-22 11:18:03 +0100 | [diff] [blame] | 974 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 975 | } |
| 976 | |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 977 | 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] | 978 | { |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 979 | struct uart_port *uport = state->uart_port; |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 980 | struct tty_port *port = &state->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 981 | int flags, ret; |
| 982 | |
| 983 | if (!capable(CAP_SYS_ADMIN)) |
| 984 | return -EPERM; |
| 985 | |
| 986 | /* |
| 987 | * Take the per-port semaphore. This prevents count from |
| 988 | * changing, and hence any extra opens of the port while |
| 989 | * we're auto-configuring. |
| 990 | */ |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 991 | if (mutex_lock_interruptible(&port->mutex)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 992 | return -ERESTARTSYS; |
| 993 | |
| 994 | ret = -EBUSY; |
Alan Cox | b58d13a | 2009-09-19 13:13:32 -0700 | [diff] [blame] | 995 | if (tty_port_users(port) == 1) { |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 996 | uart_shutdown(tty, state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | |
| 998 | /* |
| 999 | * If we already have a port type configured, |
| 1000 | * we must release its resources. |
| 1001 | */ |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1002 | if (uport->type != PORT_UNKNOWN) |
| 1003 | uport->ops->release_port(uport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | |
| 1005 | flags = UART_CONFIG_TYPE; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1006 | if (uport->flags & UPF_AUTO_IRQ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1007 | flags |= UART_CONFIG_IRQ; |
| 1008 | |
| 1009 | /* |
| 1010 | * This will claim the ports resources if |
| 1011 | * a port is found. |
| 1012 | */ |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1013 | uport->ops->config_port(uport, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1014 | |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 1015 | ret = uart_startup(tty, state, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1016 | } |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1017 | mutex_unlock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1018 | return ret; |
| 1019 | } |
| 1020 | |
| 1021 | /* |
| 1022 | * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change |
| 1023 | * - mask passed in arg for lines of interest |
| 1024 | * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) |
| 1025 | * Caller should use TIOCGICOUNT to see which one it was |
Alan Cox | bdc04e3 | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1026 | * |
| 1027 | * FIXME: This wants extracting into a common all driver implementation |
| 1028 | * of TIOCMWAIT using tty_port. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1029 | */ |
| 1030 | static int |
| 1031 | uart_wait_modem_status(struct uart_state *state, unsigned long arg) |
| 1032 | { |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1033 | struct uart_port *uport = state->uart_port; |
Alan Cox | bdc04e3 | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1034 | struct tty_port *port = &state->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1035 | DECLARE_WAITQUEUE(wait, current); |
| 1036 | struct uart_icount cprev, cnow; |
| 1037 | int ret; |
| 1038 | |
| 1039 | /* |
| 1040 | * note the counters on entry |
| 1041 | */ |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1042 | spin_lock_irq(&uport->lock); |
| 1043 | memcpy(&cprev, &uport->icount, sizeof(struct uart_icount)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1044 | |
| 1045 | /* |
| 1046 | * Force modem status interrupts on |
| 1047 | */ |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1048 | uport->ops->enable_ms(uport); |
| 1049 | spin_unlock_irq(&uport->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1050 | |
Alan Cox | bdc04e3 | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1051 | add_wait_queue(&port->delta_msr_wait, &wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1052 | for (;;) { |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1053 | spin_lock_irq(&uport->lock); |
| 1054 | memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); |
| 1055 | spin_unlock_irq(&uport->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1056 | |
| 1057 | set_current_state(TASK_INTERRUPTIBLE); |
| 1058 | |
| 1059 | if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || |
| 1060 | ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || |
| 1061 | ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || |
| 1062 | ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) { |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 1063 | ret = 0; |
| 1064 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1065 | } |
| 1066 | |
| 1067 | schedule(); |
| 1068 | |
| 1069 | /* see if a signal did it */ |
| 1070 | if (signal_pending(current)) { |
| 1071 | ret = -ERESTARTSYS; |
| 1072 | break; |
| 1073 | } |
| 1074 | |
| 1075 | cprev = cnow; |
| 1076 | } |
| 1077 | |
| 1078 | current->state = TASK_RUNNING; |
Alan Cox | bdc04e3 | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1079 | remove_wait_queue(&port->delta_msr_wait, &wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1080 | |
| 1081 | return ret; |
| 1082 | } |
| 1083 | |
| 1084 | /* |
| 1085 | * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) |
| 1086 | * Return: write counters to the user passed counter struct |
| 1087 | * NB: both 1->0 and 0->1 transitions are counted except for |
| 1088 | * RI where only 0->1 is counted. |
| 1089 | */ |
Alan Cox | d281da7 | 2010-09-16 18:21:24 +0100 | [diff] [blame] | 1090 | static int uart_get_icount(struct tty_struct *tty, |
| 1091 | struct serial_icounter_struct *icount) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1092 | { |
Alan Cox | d281da7 | 2010-09-16 18:21:24 +0100 | [diff] [blame] | 1093 | struct uart_state *state = tty->driver_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1094 | struct uart_icount cnow; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1095 | struct uart_port *uport = state->uart_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1096 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1097 | spin_lock_irq(&uport->lock); |
| 1098 | memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); |
| 1099 | spin_unlock_irq(&uport->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1100 | |
Alan Cox | d281da7 | 2010-09-16 18:21:24 +0100 | [diff] [blame] | 1101 | icount->cts = cnow.cts; |
| 1102 | icount->dsr = cnow.dsr; |
| 1103 | icount->rng = cnow.rng; |
| 1104 | icount->dcd = cnow.dcd; |
| 1105 | icount->rx = cnow.rx; |
| 1106 | icount->tx = cnow.tx; |
| 1107 | icount->frame = cnow.frame; |
| 1108 | icount->overrun = cnow.overrun; |
| 1109 | icount->parity = cnow.parity; |
| 1110 | icount->brk = cnow.brk; |
| 1111 | icount->buf_overrun = cnow.buf_overrun; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1112 | |
Alan Cox | d281da7 | 2010-09-16 18:21:24 +0100 | [diff] [blame] | 1113 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1114 | } |
| 1115 | |
| 1116 | /* |
Alan Cox | e523844 | 2008-04-30 00:53:28 -0700 | [diff] [blame] | 1117 | * Called via sys_ioctl. We can use spin_lock_irq() here. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1118 | */ |
| 1119 | static int |
Alan Cox | 6caa76b | 2011-02-14 16:27:22 +0000 | [diff] [blame] | 1120 | uart_ioctl(struct tty_struct *tty, unsigned int cmd, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1121 | unsigned long arg) |
| 1122 | { |
| 1123 | struct uart_state *state = tty->driver_data; |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1124 | struct tty_port *port = &state->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1125 | void __user *uarg = (void __user *)arg; |
| 1126 | int ret = -ENOIOCTLCMD; |
| 1127 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1128 | |
| 1129 | /* |
| 1130 | * These ioctls don't rely on the hardware to be present. |
| 1131 | */ |
| 1132 | switch (cmd) { |
| 1133 | case TIOCGSERIAL: |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 1134 | ret = uart_get_info_user(state, uarg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1135 | break; |
| 1136 | |
| 1137 | case TIOCSSERIAL: |
Alan Cox | 7ba2e76 | 2012-09-04 16:34:45 +0100 | [diff] [blame] | 1138 | ret = uart_set_info_user(tty, state, uarg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1139 | break; |
| 1140 | |
| 1141 | case TIOCSERCONFIG: |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 1142 | ret = uart_do_autoconfig(tty, state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1143 | break; |
| 1144 | |
| 1145 | case TIOCSERGWILD: /* obsolete */ |
| 1146 | case TIOCSERSWILD: /* obsolete */ |
| 1147 | ret = 0; |
| 1148 | break; |
| 1149 | } |
| 1150 | |
| 1151 | if (ret != -ENOIOCTLCMD) |
| 1152 | goto out; |
| 1153 | |
| 1154 | if (tty->flags & (1 << TTY_IO_ERROR)) { |
| 1155 | ret = -EIO; |
| 1156 | goto out; |
| 1157 | } |
| 1158 | |
| 1159 | /* |
| 1160 | * The following should only be used when hardware is present. |
| 1161 | */ |
| 1162 | switch (cmd) { |
| 1163 | case TIOCMIWAIT: |
| 1164 | ret = uart_wait_modem_status(state, arg); |
| 1165 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1166 | } |
| 1167 | |
| 1168 | if (ret != -ENOIOCTLCMD) |
| 1169 | goto out; |
| 1170 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1171 | mutex_lock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1172 | |
Alan Cox | 6caa76b | 2011-02-14 16:27:22 +0000 | [diff] [blame] | 1173 | if (tty->flags & (1 << TTY_IO_ERROR)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1174 | ret = -EIO; |
| 1175 | goto out_up; |
| 1176 | } |
| 1177 | |
| 1178 | /* |
| 1179 | * All these rely on hardware being present and need to be |
| 1180 | * protected against the tty being hung up. |
| 1181 | */ |
| 1182 | switch (cmd) { |
| 1183 | case TIOCSERGETLSR: /* Get line status register */ |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 1184 | ret = uart_get_lsr_info(tty, state, uarg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1185 | break; |
| 1186 | |
| 1187 | default: { |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1188 | struct uart_port *uport = state->uart_port; |
| 1189 | if (uport->ops->ioctl) |
| 1190 | ret = uport->ops->ioctl(uport, cmd, arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1191 | break; |
| 1192 | } |
| 1193 | } |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 1194 | out_up: |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1195 | mutex_unlock(&port->mutex); |
Alan Cox | f34d7a5 | 2008-04-30 00:54:13 -0700 | [diff] [blame] | 1196 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1197 | return ret; |
| 1198 | } |
| 1199 | |
Linus Torvalds | edeb280 | 2008-06-04 10:35:03 -0700 | [diff] [blame] | 1200 | static void uart_set_ldisc(struct tty_struct *tty) |
Alan Cox | 64e9159 | 2008-06-03 15:18:54 +0100 | [diff] [blame] | 1201 | { |
| 1202 | struct uart_state *state = tty->driver_data; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1203 | struct uart_port *uport = state->uart_port; |
Alan Cox | 64e9159 | 2008-06-03 15:18:54 +0100 | [diff] [blame] | 1204 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1205 | if (uport->ops->set_ldisc) |
Alan Cox | adc8d74 | 2012-07-14 15:31:47 +0100 | [diff] [blame] | 1206 | uport->ops->set_ldisc(uport, tty->termios.c_line); |
Alan Cox | 64e9159 | 2008-06-03 15:18:54 +0100 | [diff] [blame] | 1207 | } |
| 1208 | |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 1209 | static void uart_set_termios(struct tty_struct *tty, |
| 1210 | struct ktermios *old_termios) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1211 | { |
| 1212 | struct uart_state *state = tty->driver_data; |
| 1213 | unsigned long flags; |
Alan Cox | adc8d74 | 2012-07-14 15:31:47 +0100 | [diff] [blame] | 1214 | unsigned int cflag = tty->termios.c_cflag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1215 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1216 | |
| 1217 | /* |
| 1218 | * These are the bits that are used to setup various |
David Woodhouse | 20620d6 | 2007-08-22 14:01:11 -0700 | [diff] [blame] | 1219 | * flags in the low level driver. We can ignore the Bfoo |
| 1220 | * bits in c_cflag; c_[io]speed will always be set |
| 1221 | * appropriately by set_termios() in tty_ioctl.c |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1222 | */ |
| 1223 | #define RELEVANT_IFLAG(iflag) ((iflag) & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1224 | if ((cflag ^ old_termios->c_cflag) == 0 && |
Alan Cox | adc8d74 | 2012-07-14 15:31:47 +0100 | [diff] [blame] | 1225 | tty->termios.c_ospeed == old_termios->c_ospeed && |
| 1226 | tty->termios.c_ispeed == old_termios->c_ispeed && |
| 1227 | RELEVANT_IFLAG(tty->termios.c_iflag ^ old_termios->c_iflag) == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1228 | return; |
Alan Cox | e523844 | 2008-04-30 00:53:28 -0700 | [diff] [blame] | 1229 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1230 | |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 1231 | uart_change_speed(tty, state, old_termios); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1232 | |
| 1233 | /* Handle transition to B0 status */ |
| 1234 | if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1235 | uart_clear_mctrl(state->uart_port, TIOCM_RTS | TIOCM_DTR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1236 | /* Handle transition away from B0 status */ |
André Goddard Rosa | 82cb7ba | 2009-10-25 11:18:26 -0200 | [diff] [blame] | 1237 | else if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1238 | unsigned int mask = TIOCM_DTR; |
| 1239 | if (!(cflag & CRTSCTS) || |
| 1240 | !test_bit(TTY_THROTTLED, &tty->flags)) |
| 1241 | mask |= TIOCM_RTS; |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1242 | uart_set_mctrl(state->uart_port, mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1243 | } |
| 1244 | |
| 1245 | /* Handle turning off CRTSCTS */ |
| 1246 | if ((old_termios->c_cflag & CRTSCTS) && !(cflag & CRTSCTS)) { |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1247 | spin_lock_irqsave(&state->uart_port->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1248 | tty->hw_stopped = 0; |
| 1249 | __uart_start(tty); |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1250 | spin_unlock_irqrestore(&state->uart_port->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1251 | } |
Russell King | 0dd7a1a | 2005-06-29 18:40:53 +0100 | [diff] [blame] | 1252 | /* Handle turning on CRTSCTS */ |
André Goddard Rosa | 82cb7ba | 2009-10-25 11:18:26 -0200 | [diff] [blame] | 1253 | else if (!(old_termios->c_cflag & CRTSCTS) && (cflag & CRTSCTS)) { |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1254 | spin_lock_irqsave(&state->uart_port->lock, flags); |
| 1255 | if (!(state->uart_port->ops->get_mctrl(state->uart_port) & TIOCM_CTS)) { |
Russell King | 0dd7a1a | 2005-06-29 18:40:53 +0100 | [diff] [blame] | 1256 | tty->hw_stopped = 1; |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1257 | state->uart_port->ops->stop_tx(state->uart_port); |
Russell King | 0dd7a1a | 2005-06-29 18:40:53 +0100 | [diff] [blame] | 1258 | } |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1259 | spin_unlock_irqrestore(&state->uart_port->lock, flags); |
Russell King | 0dd7a1a | 2005-06-29 18:40:53 +0100 | [diff] [blame] | 1260 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1261 | } |
| 1262 | |
| 1263 | /* |
| 1264 | * In 2.4.5, calls to this will be serialized via the BKL in |
| 1265 | * linux/drivers/char/tty_io.c:tty_release() |
| 1266 | * linux/drivers/char/tty_io.c:do_tty_handup() |
| 1267 | */ |
| 1268 | static void uart_close(struct tty_struct *tty, struct file *filp) |
| 1269 | { |
| 1270 | struct uart_state *state = tty->driver_data; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1271 | struct tty_port *port; |
| 1272 | struct uart_port *uport; |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1273 | unsigned long flags; |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 1274 | |
Linus Torvalds | eea7e17 | 2009-10-12 19:13:54 +0200 | [diff] [blame] | 1275 | if (!state) |
| 1276 | return; |
| 1277 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1278 | uport = state->uart_port; |
| 1279 | port = &state->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1280 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1281 | pr_debug("uart_close(%d) called\n", uport->line); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1282 | |
Jiri Slaby | d30ccf0 | 2011-11-09 21:33:46 +0100 | [diff] [blame] | 1283 | if (tty_port_close_start(port, tty, filp) == 0) |
Nobuhiro Iwamatsu | 5595621 | 2011-08-29 15:43:36 +0900 | [diff] [blame] | 1284 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1285 | |
| 1286 | /* |
| 1287 | * At this point, we stop accepting input. To do this, we |
| 1288 | * disable the receive line status interrupts. |
| 1289 | */ |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1290 | if (port->flags & ASYNC_INITIALIZED) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1291 | unsigned long flags; |
Linus Torvalds | eea7e17 | 2009-10-12 19:13:54 +0200 | [diff] [blame] | 1292 | spin_lock_irqsave(&uport->lock, flags); |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1293 | uport->ops->stop_rx(uport); |
Linus Torvalds | eea7e17 | 2009-10-12 19:13:54 +0200 | [diff] [blame] | 1294 | spin_unlock_irqrestore(&uport->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1295 | /* |
| 1296 | * Before we drop DTR, make sure the UART transmitter |
| 1297 | * has completely drained; this is especially |
| 1298 | * important if there is a transmit FIFO! |
| 1299 | */ |
Jiri Slaby | 1f33a51 | 2011-07-14 14:35:10 +0200 | [diff] [blame] | 1300 | uart_wait_until_sent(tty, uport->timeout); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1301 | } |
| 1302 | |
Jiri Slaby | bafb0bd | 2011-08-25 15:12:05 +0200 | [diff] [blame] | 1303 | mutex_lock(&port->mutex); |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 1304 | uart_shutdown(tty, state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1305 | uart_flush_buffer(tty); |
| 1306 | |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 1307 | tty_ldisc_flush(tty); |
| 1308 | |
Alan Cox | 7b01478 | 2009-09-19 13:13:33 -0700 | [diff] [blame] | 1309 | tty_port_tty_set(port, NULL); |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1310 | spin_lock_irqsave(&port->lock, flags); |
| 1311 | tty->closing = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1312 | |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1313 | if (port->blocked_open) { |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1314 | spin_unlock_irqrestore(&port->lock, flags); |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1315 | if (port->close_delay) |
Jiri Slaby | 4cb0fbf | 2011-11-09 21:33:45 +0100 | [diff] [blame] | 1316 | msleep_interruptible( |
| 1317 | jiffies_to_msecs(port->close_delay)); |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1318 | spin_lock_irqsave(&port->lock, flags); |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1319 | } else if (!uart_console(uport)) { |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1320 | spin_unlock_irqrestore(&port->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1321 | uart_change_pm(state, 3); |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1322 | spin_lock_irqsave(&port->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1323 | } |
| 1324 | |
| 1325 | /* |
| 1326 | * Wake up anyone trying to open this port. |
| 1327 | */ |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1328 | clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); |
Jiri Slaby | 426929f | 2011-08-25 15:12:04 +0200 | [diff] [blame] | 1329 | clear_bit(ASYNCB_CLOSING, &port->flags); |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1330 | spin_unlock_irqrestore(&port->lock, flags); |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1331 | wake_up_interruptible(&port->open_wait); |
Jiri Slaby | 426929f | 2011-08-25 15:12:04 +0200 | [diff] [blame] | 1332 | wake_up_interruptible(&port->close_wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1333 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1334 | mutex_unlock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1335 | } |
| 1336 | |
Jiri Slaby | 1f33a51 | 2011-07-14 14:35:10 +0200 | [diff] [blame] | 1337 | static void uart_wait_until_sent(struct tty_struct *tty, int timeout) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1338 | { |
Jiri Slaby | 1f33a51 | 2011-07-14 14:35:10 +0200 | [diff] [blame] | 1339 | struct uart_state *state = tty->driver_data; |
| 1340 | struct uart_port *port = state->uart_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1341 | unsigned long char_time, expire; |
| 1342 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1343 | if (port->type == PORT_UNKNOWN || port->fifosize == 0) |
| 1344 | return; |
| 1345 | |
| 1346 | /* |
| 1347 | * Set the check interval to be 1/5 of the estimated time to |
| 1348 | * send a single character, and make it at least 1. The check |
| 1349 | * interval should also be less than the timeout. |
| 1350 | * |
| 1351 | * Note: we have to use pretty tight timings here to satisfy |
| 1352 | * the NIST-PCTS. |
| 1353 | */ |
| 1354 | char_time = (port->timeout - HZ/50) / port->fifosize; |
| 1355 | char_time = char_time / 5; |
| 1356 | if (char_time == 0) |
| 1357 | char_time = 1; |
| 1358 | if (timeout && timeout < char_time) |
| 1359 | char_time = timeout; |
| 1360 | |
| 1361 | /* |
| 1362 | * If the transmitter hasn't cleared in twice the approximate |
| 1363 | * amount of time to send the entire FIFO, it probably won't |
| 1364 | * ever clear. This assumes the UART isn't doing flow |
| 1365 | * control, which is currently the case. Hence, if it ever |
| 1366 | * takes longer than port->timeout, this is probably due to a |
| 1367 | * UART bug of some kind. So, we clamp the timeout parameter at |
| 1368 | * 2*port->timeout. |
| 1369 | */ |
| 1370 | if (timeout == 0 || timeout > 2 * port->timeout) |
| 1371 | timeout = 2 * port->timeout; |
| 1372 | |
| 1373 | expire = jiffies + timeout; |
| 1374 | |
Jiri Slaby | eb3a1e1 | 2007-05-06 14:48:52 -0700 | [diff] [blame] | 1375 | pr_debug("uart_wait_until_sent(%d), jiffies=%lu, expire=%lu...\n", |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 1376 | port->line, jiffies, expire); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1377 | |
| 1378 | /* |
| 1379 | * Check whether the transmitter is empty every 'char_time'. |
| 1380 | * 'timeout' / 'expire' give us the maximum amount of time |
| 1381 | * we wait. |
| 1382 | */ |
| 1383 | while (!port->ops->tx_empty(port)) { |
| 1384 | msleep_interruptible(jiffies_to_msecs(char_time)); |
| 1385 | if (signal_pending(current)) |
| 1386 | break; |
| 1387 | if (time_after(jiffies, expire)) |
| 1388 | break; |
| 1389 | } |
Arnd Bergmann | 2036521 | 2010-06-01 22:53:07 +0200 | [diff] [blame] | 1390 | } |
| 1391 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1392 | /* |
| 1393 | * This is called with the BKL held in |
| 1394 | * linux/drivers/char/tty_io.c:do_tty_hangup() |
| 1395 | * We're called from the eventd thread, so we can sleep for |
| 1396 | * a _short_ time only. |
| 1397 | */ |
| 1398 | static void uart_hangup(struct tty_struct *tty) |
| 1399 | { |
| 1400 | struct uart_state *state = tty->driver_data; |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1401 | struct tty_port *port = &state->port; |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1402 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1403 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1404 | pr_debug("uart_hangup(%d)\n", state->uart_port->line); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1405 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1406 | mutex_lock(&port->mutex); |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1407 | if (port->flags & ASYNC_NORMAL_ACTIVE) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1408 | uart_flush_buffer(tty); |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 1409 | uart_shutdown(tty, state); |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1410 | spin_lock_irqsave(&port->lock, flags); |
Alan Cox | 91312cd | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1411 | port->count = 0; |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1412 | clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1413 | spin_unlock_irqrestore(&port->lock, flags); |
Alan Cox | 7b01478 | 2009-09-19 13:13:33 -0700 | [diff] [blame] | 1414 | tty_port_tty_set(port, NULL); |
Alan Cox | 46d57a4 | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1415 | wake_up_interruptible(&port->open_wait); |
Alan Cox | bdc04e3 | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1416 | wake_up_interruptible(&port->delta_msr_wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1417 | } |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1418 | mutex_unlock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1419 | } |
| 1420 | |
Jiri Slaby | 0b1db83 | 2011-11-09 21:33:50 +0100 | [diff] [blame] | 1421 | static int uart_port_activate(struct tty_port *port, struct tty_struct *tty) |
| 1422 | { |
| 1423 | return 0; |
| 1424 | } |
| 1425 | |
| 1426 | static void uart_port_shutdown(struct tty_port *port) |
| 1427 | { |
Jiri Slaby | b922e19 | 2011-11-09 21:33:51 +0100 | [diff] [blame] | 1428 | struct uart_state *state = container_of(port, struct uart_state, port); |
| 1429 | struct uart_port *uport = state->uart_port; |
| 1430 | |
| 1431 | /* |
| 1432 | * clear delta_msr_wait queue to avoid mem leaks: we may free |
| 1433 | * the irq here so the queue might never be woken up. Note |
| 1434 | * that we won't end up waiting on delta_msr_wait again since |
| 1435 | * any outstanding file descriptors should be pointing at |
| 1436 | * hung_up_tty_fops now. |
| 1437 | */ |
| 1438 | wake_up_interruptible(&port->delta_msr_wait); |
| 1439 | |
| 1440 | /* |
| 1441 | * Free the IRQ and disable the port. |
| 1442 | */ |
| 1443 | uport->ops->shutdown(uport); |
| 1444 | |
| 1445 | /* |
| 1446 | * Ensure that the IRQ handler isn't running on another CPU. |
| 1447 | */ |
| 1448 | synchronize_irq(uport->irq); |
Jiri Slaby | 0b1db83 | 2011-11-09 21:33:50 +0100 | [diff] [blame] | 1449 | } |
| 1450 | |
Alan Cox | de0c8cb | 2010-06-01 22:52:58 +0200 | [diff] [blame] | 1451 | static int uart_carrier_raised(struct tty_port *port) |
| 1452 | { |
| 1453 | struct uart_state *state = container_of(port, struct uart_state, port); |
| 1454 | struct uart_port *uport = state->uart_port; |
| 1455 | int mctrl; |
Alan Cox | de0c8cb | 2010-06-01 22:52:58 +0200 | [diff] [blame] | 1456 | spin_lock_irq(&uport->lock); |
| 1457 | uport->ops->enable_ms(uport); |
| 1458 | mctrl = uport->ops->get_mctrl(uport); |
| 1459 | spin_unlock_irq(&uport->lock); |
Alan Cox | de0c8cb | 2010-06-01 22:52:58 +0200 | [diff] [blame] | 1460 | if (mctrl & TIOCM_CAR) |
| 1461 | return 1; |
| 1462 | return 0; |
| 1463 | } |
| 1464 | |
| 1465 | static void uart_dtr_rts(struct tty_port *port, int onoff) |
| 1466 | { |
| 1467 | struct uart_state *state = container_of(port, struct uart_state, port); |
| 1468 | struct uart_port *uport = state->uart_port; |
Alan Cox | 24fcc7c | 2010-06-01 22:52:59 +0200 | [diff] [blame] | 1469 | |
Jiri Slaby | 6f5c24a | 2011-03-30 00:10:57 +0200 | [diff] [blame] | 1470 | if (onoff) |
Alan Cox | de0c8cb | 2010-06-01 22:52:58 +0200 | [diff] [blame] | 1471 | uart_set_mctrl(uport, TIOCM_DTR | TIOCM_RTS); |
| 1472 | else |
| 1473 | uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); |
Alan Cox | de0c8cb | 2010-06-01 22:52:58 +0200 | [diff] [blame] | 1474 | } |
| 1475 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1476 | /* |
Denis Cheng | 922f9cf | 2008-02-08 04:22:00 -0800 | [diff] [blame] | 1477 | * calls to uart_open are serialised by the BKL in |
| 1478 | * fs/char_dev.c:chrdev_open() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1479 | * Note that if this fails, then uart_close() _will_ be called. |
| 1480 | * |
| 1481 | * In time, we want to scrap the "opening nonpresent ports" |
| 1482 | * behaviour and implement an alternative way for setserial |
| 1483 | * to set base addresses/ports/types. This will allow us to |
| 1484 | * get rid of a certain amount of extra tests. |
| 1485 | */ |
| 1486 | static int uart_open(struct tty_struct *tty, struct file *filp) |
| 1487 | { |
| 1488 | struct uart_driver *drv = (struct uart_driver *)tty->driver->driver_state; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1489 | int retval, line = tty->index; |
Jiri Slaby | 1c7b13c | 2011-11-09 21:33:49 +0100 | [diff] [blame] | 1490 | struct uart_state *state = drv->state + line; |
| 1491 | struct tty_port *port = &state->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1492 | |
Jiri Slaby | eb3a1e1 | 2007-05-06 14:48:52 -0700 | [diff] [blame] | 1493 | pr_debug("uart_open(%d) called\n", line); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1494 | |
| 1495 | /* |
Jiri Slaby | 1c7b13c | 2011-11-09 21:33:49 +0100 | [diff] [blame] | 1496 | * We take the semaphore here to guarantee that we won't be re-entered |
| 1497 | * while allocating the state structure, or while we request any IRQs |
| 1498 | * that the driver may need. This also has the nice side-effect that |
| 1499 | * it delays the action of uart_hangup, so we can guarantee that |
| 1500 | * state->port.tty will always contain something reasonable. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1501 | */ |
Jiri Slaby | 1c7b13c | 2011-11-09 21:33:49 +0100 | [diff] [blame] | 1502 | if (mutex_lock_interruptible(&port->mutex)) { |
| 1503 | retval = -ERESTARTSYS; |
| 1504 | goto end; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1505 | } |
Jiri Slaby | 1c7b13c | 2011-11-09 21:33:49 +0100 | [diff] [blame] | 1506 | |
| 1507 | port->count++; |
| 1508 | if (!state->uart_port || state->uart_port->flags & UPF_DEAD) { |
| 1509 | retval = -ENXIO; |
| 1510 | goto err_dec_count; |
| 1511 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1512 | |
| 1513 | /* |
| 1514 | * Once we set tty->driver_data here, we are guaranteed that |
| 1515 | * uart_close() will decrement the driver module use count. |
| 1516 | * Any failures from here onwards should not touch the count. |
| 1517 | */ |
| 1518 | tty->driver_data = state; |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1519 | state->uart_port->state = state; |
| 1520 | tty->low_latency = (state->uart_port->flags & UPF_LOW_LATENCY) ? 1 : 0; |
Alan Cox | 7b01478 | 2009-09-19 13:13:33 -0700 | [diff] [blame] | 1521 | tty_port_tty_set(port, tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1522 | |
| 1523 | /* |
| 1524 | * If the port is in the middle of closing, bail out now. |
| 1525 | */ |
| 1526 | if (tty_hung_up_p(filp)) { |
| 1527 | retval = -EAGAIN; |
Jiri Slaby | 1c7b13c | 2011-11-09 21:33:49 +0100 | [diff] [blame] | 1528 | goto err_dec_count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1529 | } |
| 1530 | |
| 1531 | /* |
| 1532 | * Make sure the device is in D0 state. |
| 1533 | */ |
Alan Cox | 91312cd | 2009-09-19 13:13:29 -0700 | [diff] [blame] | 1534 | if (port->count == 1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1535 | uart_change_pm(state, 0); |
| 1536 | |
| 1537 | /* |
| 1538 | * Start up the serial port. |
| 1539 | */ |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 1540 | retval = uart_startup(tty, state, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1541 | |
| 1542 | /* |
| 1543 | * If we succeeded, wait until the port is ready. |
| 1544 | */ |
Alan Cox | 61cd8a2 | 2010-06-01 22:52:57 +0200 | [diff] [blame] | 1545 | mutex_unlock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1546 | if (retval == 0) |
Alan Cox | 74c2107 | 2010-06-01 22:53:00 +0200 | [diff] [blame] | 1547 | retval = tty_port_block_til_ready(port, tty, filp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1548 | |
Jiri Slaby | 1c7b13c | 2011-11-09 21:33:49 +0100 | [diff] [blame] | 1549 | end: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1550 | return retval; |
Jiri Slaby | 1c7b13c | 2011-11-09 21:33:49 +0100 | [diff] [blame] | 1551 | err_dec_count: |
| 1552 | port->count--; |
| 1553 | mutex_unlock(&port->mutex); |
| 1554 | goto end; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1555 | } |
| 1556 | |
| 1557 | static const char *uart_type(struct uart_port *port) |
| 1558 | { |
| 1559 | const char *str = NULL; |
| 1560 | |
| 1561 | if (port->ops->type) |
| 1562 | str = port->ops->type(port); |
| 1563 | |
| 1564 | if (!str) |
| 1565 | str = "unknown"; |
| 1566 | |
| 1567 | return str; |
| 1568 | } |
| 1569 | |
| 1570 | #ifdef CONFIG_PROC_FS |
| 1571 | |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1572 | 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] | 1573 | { |
| 1574 | struct uart_state *state = drv->state + i; |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1575 | struct tty_port *port = &state->port; |
George G. Davis | 3689a0e | 2007-02-14 00:33:06 -0800 | [diff] [blame] | 1576 | int pm_state; |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1577 | struct uart_port *uport = state->uart_port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1578 | char stat_buf[32]; |
| 1579 | unsigned int status; |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1580 | int mmio; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1581 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1582 | if (!uport) |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1583 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1584 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1585 | mmio = uport->iotype >= UPIO_MEM; |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1586 | seq_printf(m, "%d: uart:%s %s%08llX irq:%d", |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1587 | uport->line, uart_type(uport), |
Sergei Shtylyov | 6c6a233 | 2006-09-04 00:04:20 +0400 | [diff] [blame] | 1588 | mmio ? "mmio:0x" : "port:", |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1589 | mmio ? (unsigned long long)uport->mapbase |
| 1590 | : (unsigned long long)uport->iobase, |
| 1591 | uport->irq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1592 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1593 | if (uport->type == PORT_UNKNOWN) { |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1594 | seq_putc(m, '\n'); |
| 1595 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1596 | } |
| 1597 | |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 1598 | if (capable(CAP_SYS_ADMIN)) { |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1599 | mutex_lock(&port->mutex); |
George G. Davis | 3689a0e | 2007-02-14 00:33:06 -0800 | [diff] [blame] | 1600 | pm_state = state->pm_state; |
| 1601 | if (pm_state) |
| 1602 | uart_change_pm(state, 0); |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1603 | spin_lock_irq(&uport->lock); |
| 1604 | status = uport->ops->get_mctrl(uport); |
| 1605 | spin_unlock_irq(&uport->lock); |
George G. Davis | 3689a0e | 2007-02-14 00:33:06 -0800 | [diff] [blame] | 1606 | if (pm_state) |
| 1607 | uart_change_pm(state, pm_state); |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1608 | mutex_unlock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1609 | |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1610 | seq_printf(m, " tx:%d rx:%d", |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1611 | uport->icount.tx, uport->icount.rx); |
| 1612 | if (uport->icount.frame) |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1613 | seq_printf(m, " fe:%d", |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1614 | uport->icount.frame); |
| 1615 | if (uport->icount.parity) |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1616 | seq_printf(m, " pe:%d", |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1617 | uport->icount.parity); |
| 1618 | if (uport->icount.brk) |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1619 | seq_printf(m, " brk:%d", |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1620 | uport->icount.brk); |
| 1621 | if (uport->icount.overrun) |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1622 | seq_printf(m, " oe:%d", |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1623 | uport->icount.overrun); |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 1624 | |
| 1625 | #define INFOBIT(bit, str) \ |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1626 | if (uport->mctrl & (bit)) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1627 | strncat(stat_buf, (str), sizeof(stat_buf) - \ |
| 1628 | strlen(stat_buf) - 2) |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 1629 | #define STATBIT(bit, str) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1630 | if (status & (bit)) \ |
| 1631 | strncat(stat_buf, (str), sizeof(stat_buf) - \ |
| 1632 | strlen(stat_buf) - 2) |
| 1633 | |
| 1634 | stat_buf[0] = '\0'; |
| 1635 | stat_buf[1] = '\0'; |
| 1636 | INFOBIT(TIOCM_RTS, "|RTS"); |
| 1637 | STATBIT(TIOCM_CTS, "|CTS"); |
| 1638 | INFOBIT(TIOCM_DTR, "|DTR"); |
| 1639 | STATBIT(TIOCM_DSR, "|DSR"); |
| 1640 | STATBIT(TIOCM_CAR, "|CD"); |
| 1641 | STATBIT(TIOCM_RNG, "|RI"); |
| 1642 | if (stat_buf[0]) |
| 1643 | stat_buf[0] = ' '; |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 1644 | |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1645 | seq_puts(m, stat_buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1646 | } |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1647 | seq_putc(m, '\n'); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1648 | #undef STATBIT |
| 1649 | #undef INFOBIT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1650 | } |
| 1651 | |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1652 | static int uart_proc_show(struct seq_file *m, void *v) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1653 | { |
Alexey Dobriyan | 833bb30 | 2009-04-02 01:30:04 +0400 | [diff] [blame] | 1654 | struct tty_driver *ttydrv = m->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1655 | struct uart_driver *drv = ttydrv->driver_state; |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1656 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1657 | |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1658 | seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1659 | "", "", ""); |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 1660 | for (i = 0; i < drv->nr; i++) |
| 1661 | uart_line_info(m, drv, i); |
| 1662 | return 0; |
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 | |
| 1665 | static int uart_proc_open(struct inode *inode, struct file *file) |
| 1666 | { |
| 1667 | return single_open(file, uart_proc_show, PDE(inode)->data); |
| 1668 | } |
| 1669 | |
| 1670 | static const struct file_operations uart_proc_fops = { |
| 1671 | .owner = THIS_MODULE, |
| 1672 | .open = uart_proc_open, |
| 1673 | .read = seq_read, |
| 1674 | .llseek = seq_lseek, |
| 1675 | .release = single_release, |
| 1676 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1677 | #endif |
| 1678 | |
Andrew Morton | 4a1b550 | 2008-03-07 15:51:16 -0800 | [diff] [blame] | 1679 | #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1680 | /* |
Russell King | d358788 | 2006-03-20 20:00:09 +0000 | [diff] [blame] | 1681 | * uart_console_write - write a console message to a serial port |
| 1682 | * @port: the port to write the message |
| 1683 | * @s: array of characters |
| 1684 | * @count: number of characters in string to write |
| 1685 | * @write: function to write character to port |
| 1686 | */ |
| 1687 | void uart_console_write(struct uart_port *port, const char *s, |
| 1688 | unsigned int count, |
| 1689 | void (*putchar)(struct uart_port *, int)) |
| 1690 | { |
| 1691 | unsigned int i; |
| 1692 | |
| 1693 | for (i = 0; i < count; i++, s++) { |
| 1694 | if (*s == '\n') |
| 1695 | putchar(port, '\r'); |
| 1696 | putchar(port, *s); |
| 1697 | } |
| 1698 | } |
| 1699 | EXPORT_SYMBOL_GPL(uart_console_write); |
| 1700 | |
| 1701 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1702 | * Check whether an invalid uart number has been specified, and |
| 1703 | * if so, search for the first available port that does have |
| 1704 | * console support. |
| 1705 | */ |
| 1706 | struct uart_port * __init |
| 1707 | uart_get_console(struct uart_port *ports, int nr, struct console *co) |
| 1708 | { |
| 1709 | int idx = co->index; |
| 1710 | |
| 1711 | if (idx < 0 || idx >= nr || (ports[idx].iobase == 0 && |
| 1712 | ports[idx].membase == NULL)) |
| 1713 | for (idx = 0; idx < nr; idx++) |
| 1714 | if (ports[idx].iobase != 0 || |
| 1715 | ports[idx].membase != NULL) |
| 1716 | break; |
| 1717 | |
| 1718 | co->index = idx; |
| 1719 | |
| 1720 | return ports + idx; |
| 1721 | } |
| 1722 | |
| 1723 | /** |
| 1724 | * uart_parse_options - Parse serial port baud/parity/bits/flow contro. |
| 1725 | * @options: pointer to option string |
| 1726 | * @baud: pointer to an 'int' variable for the baud rate. |
| 1727 | * @parity: pointer to an 'int' variable for the parity. |
| 1728 | * @bits: pointer to an 'int' variable for the number of data bits. |
| 1729 | * @flow: pointer to an 'int' variable for the flow control character. |
| 1730 | * |
| 1731 | * uart_parse_options decodes a string containing the serial console |
| 1732 | * options. The format of the string is <baud><parity><bits><flow>, |
| 1733 | * eg: 115200n8r |
| 1734 | */ |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 1735 | void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1736 | uart_parse_options(char *options, int *baud, int *parity, int *bits, int *flow) |
| 1737 | { |
| 1738 | char *s = options; |
| 1739 | |
| 1740 | *baud = simple_strtoul(s, NULL, 10); |
| 1741 | while (*s >= '0' && *s <= '9') |
| 1742 | s++; |
| 1743 | if (*s) |
| 1744 | *parity = *s++; |
| 1745 | if (*s) |
| 1746 | *bits = *s++ - '0'; |
| 1747 | if (*s) |
| 1748 | *flow = *s; |
| 1749 | } |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 1750 | EXPORT_SYMBOL_GPL(uart_parse_options); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1751 | |
| 1752 | struct baud_rates { |
| 1753 | unsigned int rate; |
| 1754 | unsigned int cflag; |
| 1755 | }; |
| 1756 | |
Arjan van de Ven | cb3592b | 2005-11-28 21:04:11 +0000 | [diff] [blame] | 1757 | static const struct baud_rates baud_rates[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1758 | { 921600, B921600 }, |
| 1759 | { 460800, B460800 }, |
| 1760 | { 230400, B230400 }, |
| 1761 | { 115200, B115200 }, |
| 1762 | { 57600, B57600 }, |
| 1763 | { 38400, B38400 }, |
| 1764 | { 19200, B19200 }, |
| 1765 | { 9600, B9600 }, |
| 1766 | { 4800, B4800 }, |
| 1767 | { 2400, B2400 }, |
| 1768 | { 1200, B1200 }, |
| 1769 | { 0, B38400 } |
| 1770 | }; |
| 1771 | |
| 1772 | /** |
| 1773 | * uart_set_options - setup the serial console parameters |
| 1774 | * @port: pointer to the serial ports uart_port structure |
| 1775 | * @co: console pointer |
| 1776 | * @baud: baud rate |
| 1777 | * @parity: parity character - 'n' (none), 'o' (odd), 'e' (even) |
| 1778 | * @bits: number of data bits |
| 1779 | * @flow: flow control character - 'r' (rts) |
| 1780 | */ |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 1781 | int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1782 | uart_set_options(struct uart_port *port, struct console *co, |
| 1783 | int baud, int parity, int bits, int flow) |
| 1784 | { |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 1785 | struct ktermios termios; |
Alan Cox | 149b36e | 2007-10-18 01:24:16 -0700 | [diff] [blame] | 1786 | static struct ktermios dummy; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1787 | int i; |
| 1788 | |
Russell King | 976ecd1 | 2005-07-03 21:05:45 +0100 | [diff] [blame] | 1789 | /* |
| 1790 | * Ensure that the serial console lock is initialised |
| 1791 | * early. |
| 1792 | */ |
| 1793 | spin_lock_init(&port->lock); |
Ingo Molnar | 13e8359 | 2006-07-03 00:25:03 -0700 | [diff] [blame] | 1794 | lockdep_set_class(&port->lock, &port_lock_key); |
Russell King | 976ecd1 | 2005-07-03 21:05:45 +0100 | [diff] [blame] | 1795 | |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 1796 | memset(&termios, 0, sizeof(struct ktermios)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1797 | |
| 1798 | termios.c_cflag = CREAD | HUPCL | CLOCAL; |
| 1799 | |
| 1800 | /* |
| 1801 | * Construct a cflag setting. |
| 1802 | */ |
| 1803 | for (i = 0; baud_rates[i].rate; i++) |
| 1804 | if (baud_rates[i].rate <= baud) |
| 1805 | break; |
| 1806 | |
| 1807 | termios.c_cflag |= baud_rates[i].cflag; |
| 1808 | |
| 1809 | if (bits == 7) |
| 1810 | termios.c_cflag |= CS7; |
| 1811 | else |
| 1812 | termios.c_cflag |= CS8; |
| 1813 | |
| 1814 | switch (parity) { |
| 1815 | case 'o': case 'O': |
| 1816 | termios.c_cflag |= PARODD; |
| 1817 | /*fall through*/ |
| 1818 | case 'e': case 'E': |
| 1819 | termios.c_cflag |= PARENB; |
| 1820 | break; |
| 1821 | } |
| 1822 | |
| 1823 | if (flow == 'r') |
| 1824 | termios.c_cflag |= CRTSCTS; |
| 1825 | |
Yinghai Lu | 7949268 | 2007-07-15 23:37:25 -0700 | [diff] [blame] | 1826 | /* |
| 1827 | * some uarts on other side don't support no flow control. |
| 1828 | * So we set * DTR in host uart to make them happy |
| 1829 | */ |
| 1830 | port->mctrl |= TIOCM_DTR; |
| 1831 | |
Alan Cox | 149b36e | 2007-10-18 01:24:16 -0700 | [diff] [blame] | 1832 | port->ops->set_termios(port, &termios, &dummy); |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 1833 | /* |
| 1834 | * Allow the setting of the UART parameters with a NULL console |
| 1835 | * too: |
| 1836 | */ |
| 1837 | if (co) |
| 1838 | co->cflag = termios.c_cflag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1839 | |
| 1840 | return 0; |
| 1841 | } |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 1842 | EXPORT_SYMBOL_GPL(uart_set_options); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1843 | #endif /* CONFIG_SERIAL_CORE_CONSOLE */ |
| 1844 | |
Jiri Slaby | cf75525 | 2011-11-09 21:33:47 +0100 | [diff] [blame] | 1845 | /** |
| 1846 | * uart_change_pm - set power state of the port |
| 1847 | * |
| 1848 | * @state: port descriptor |
| 1849 | * @pm_state: new state |
| 1850 | * |
| 1851 | * Locking: port->mutex has to be held |
| 1852 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1853 | static void uart_change_pm(struct uart_state *state, int pm_state) |
| 1854 | { |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 1855 | struct uart_port *port = state->uart_port; |
Andrew Victor | 1281e36 | 2006-05-16 11:28:49 +0100 | [diff] [blame] | 1856 | |
| 1857 | if (state->pm_state != pm_state) { |
| 1858 | if (port->ops->pm) |
| 1859 | port->ops->pm(port, pm_state, state->pm_state); |
| 1860 | state->pm_state = pm_state; |
| 1861 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1862 | } |
| 1863 | |
Guennadi Liakhovetski | b3b708f | 2007-10-16 01:24:02 -0700 | [diff] [blame] | 1864 | struct uart_match { |
| 1865 | struct uart_port *port; |
| 1866 | struct uart_driver *driver; |
| 1867 | }; |
| 1868 | |
| 1869 | static int serial_match_port(struct device *dev, void *data) |
| 1870 | { |
| 1871 | struct uart_match *match = data; |
Guennadi Liakhovetski | 7ca796f | 2008-07-04 09:59:28 -0700 | [diff] [blame] | 1872 | struct tty_driver *tty_drv = match->driver->tty_driver; |
| 1873 | dev_t devt = MKDEV(tty_drv->major, tty_drv->minor_start) + |
| 1874 | match->port->line; |
Guennadi Liakhovetski | b3b708f | 2007-10-16 01:24:02 -0700 | [diff] [blame] | 1875 | |
| 1876 | return dev->devt == devt; /* Actually, only one tty per port */ |
| 1877 | } |
| 1878 | |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1879 | int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1880 | { |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1881 | struct uart_state *state = drv->state + uport->line; |
| 1882 | struct tty_port *port = &state->port; |
Guennadi Liakhovetski | b3b708f | 2007-10-16 01:24:02 -0700 | [diff] [blame] | 1883 | struct device *tty_dev; |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1884 | struct uart_match match = {uport, drv}; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1885 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1886 | mutex_lock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1887 | |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1888 | tty_dev = device_find_child(uport->dev, &match, serial_match_port); |
Guennadi Liakhovetski | b3b708f | 2007-10-16 01:24:02 -0700 | [diff] [blame] | 1889 | if (device_may_wakeup(tty_dev)) { |
Govindraj.R | 3f960db | 2010-12-16 18:12:47 +0530 | [diff] [blame] | 1890 | if (!enable_irq_wake(uport->irq)) |
| 1891 | uport->irq_wake = 1; |
Guennadi Liakhovetski | b3b708f | 2007-10-16 01:24:02 -0700 | [diff] [blame] | 1892 | put_device(tty_dev); |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1893 | mutex_unlock(&port->mutex); |
Guennadi Liakhovetski | b3b708f | 2007-10-16 01:24:02 -0700 | [diff] [blame] | 1894 | return 0; |
| 1895 | } |
Stanislav Brabec | 4547be7 | 2009-12-02 16:20:56 +0100 | [diff] [blame] | 1896 | if (console_suspend_enabled || !uart_console(uport)) |
| 1897 | uport->suspended = 1; |
Guennadi Liakhovetski | b3b708f | 2007-10-16 01:24:02 -0700 | [diff] [blame] | 1898 | |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1899 | if (port->flags & ASYNC_INITIALIZED) { |
| 1900 | const struct uart_ops *ops = uport->ops; |
Russell King | c8c6bfa | 2008-02-04 22:27:52 -0800 | [diff] [blame] | 1901 | int tries; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1902 | |
Stanislav Brabec | 4547be7 | 2009-12-02 16:20:56 +0100 | [diff] [blame] | 1903 | if (console_suspend_enabled || !uart_console(uport)) { |
| 1904 | set_bit(ASYNCB_SUSPENDED, &port->flags); |
| 1905 | clear_bit(ASYNCB_INITIALIZED, &port->flags); |
Russell King | a6b93a9 | 2006-10-01 17:17:40 +0100 | [diff] [blame] | 1906 | |
Stanislav Brabec | 4547be7 | 2009-12-02 16:20:56 +0100 | [diff] [blame] | 1907 | spin_lock_irq(&uport->lock); |
| 1908 | ops->stop_tx(uport); |
| 1909 | ops->set_mctrl(uport, 0); |
| 1910 | ops->stop_rx(uport); |
| 1911 | spin_unlock_irq(&uport->lock); |
| 1912 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1913 | |
| 1914 | /* |
| 1915 | * Wait for the transmitter to empty. |
| 1916 | */ |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1917 | for (tries = 3; !ops->tx_empty(uport) && tries; tries--) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1918 | msleep(10); |
Russell King | c8c6bfa | 2008-02-04 22:27:52 -0800 | [diff] [blame] | 1919 | if (!tries) |
Alan Cox | a46c999 | 2008-02-08 04:18:53 -0800 | [diff] [blame] | 1920 | printk(KERN_ERR "%s%s%s%d: Unable to drain " |
| 1921 | "transmitter\n", |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1922 | uport->dev ? dev_name(uport->dev) : "", |
| 1923 | uport->dev ? ": " : "", |
David S. Miller | 8440838 | 2008-10-13 10:45:26 +0100 | [diff] [blame] | 1924 | drv->dev_name, |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1925 | drv->tty_driver->name_base + uport->line); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1926 | |
Stanislav Brabec | 4547be7 | 2009-12-02 16:20:56 +0100 | [diff] [blame] | 1927 | if (console_suspend_enabled || !uart_console(uport)) |
| 1928 | ops->shutdown(uport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1929 | } |
| 1930 | |
| 1931 | /* |
| 1932 | * Disable the console device before suspending. |
| 1933 | */ |
Stanislav Brabec | 4547be7 | 2009-12-02 16:20:56 +0100 | [diff] [blame] | 1934 | if (console_suspend_enabled && uart_console(uport)) |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1935 | console_stop(uport->cons); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1936 | |
Stanislav Brabec | 4547be7 | 2009-12-02 16:20:56 +0100 | [diff] [blame] | 1937 | if (console_suspend_enabled || !uart_console(uport)) |
| 1938 | uart_change_pm(state, 3); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1939 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1940 | mutex_unlock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1941 | |
| 1942 | return 0; |
| 1943 | } |
| 1944 | |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1945 | int uart_resume_port(struct uart_driver *drv, struct uart_port *uport) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1946 | { |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1947 | struct uart_state *state = drv->state + uport->line; |
| 1948 | struct tty_port *port = &state->port; |
Arjan van de Ven | 03a74dc | 2008-05-23 13:04:49 -0700 | [diff] [blame] | 1949 | struct device *tty_dev; |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1950 | struct uart_match match = {uport, drv}; |
Deepak Saxena | ba15ab0 | 2009-09-19 13:13:33 -0700 | [diff] [blame] | 1951 | struct ktermios termios; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1952 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1953 | mutex_lock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1954 | |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1955 | tty_dev = device_find_child(uport->dev, &match, serial_match_port); |
| 1956 | if (!uport->suspended && device_may_wakeup(tty_dev)) { |
Govindraj.R | 3f960db | 2010-12-16 18:12:47 +0530 | [diff] [blame] | 1957 | if (uport->irq_wake) { |
| 1958 | disable_irq_wake(uport->irq); |
| 1959 | uport->irq_wake = 0; |
| 1960 | } |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 1961 | mutex_unlock(&port->mutex); |
Guennadi Liakhovetski | b3b708f | 2007-10-16 01:24:02 -0700 | [diff] [blame] | 1962 | return 0; |
| 1963 | } |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1964 | uport->suspended = 0; |
Guennadi Liakhovetski | b3b708f | 2007-10-16 01:24:02 -0700 | [diff] [blame] | 1965 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1966 | /* |
| 1967 | * Re-enable the console device after suspending. |
| 1968 | */ |
Yin Kangkai | 5933a16 | 2011-01-30 11:15:30 +0800 | [diff] [blame] | 1969 | if (uart_console(uport)) { |
Jason Wang | 891b9dd | 2010-08-21 15:14:42 +0800 | [diff] [blame] | 1970 | /* |
| 1971 | * First try to use the console cflag setting. |
| 1972 | */ |
| 1973 | memset(&termios, 0, sizeof(struct ktermios)); |
| 1974 | termios.c_cflag = uport->cons->cflag; |
| 1975 | |
| 1976 | /* |
| 1977 | * If that's unset, use the tty termios setting. |
| 1978 | */ |
Alan Cox | adc8d74 | 2012-07-14 15:31:47 +0100 | [diff] [blame] | 1979 | if (port->tty && termios.c_cflag == 0) |
| 1980 | termios = port->tty->termios; |
Jason Wang | 891b9dd | 2010-08-21 15:14:42 +0800 | [diff] [blame] | 1981 | |
Ning Jiang | 94abc56 | 2011-09-05 16:28:18 +0800 | [diff] [blame] | 1982 | if (console_suspend_enabled) |
| 1983 | uart_change_pm(state, 0); |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1984 | uport->ops->set_termios(uport, &termios, NULL); |
Yin Kangkai | 5933a16 | 2011-01-30 11:15:30 +0800 | [diff] [blame] | 1985 | if (console_suspend_enabled) |
| 1986 | console_start(uport->cons); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1987 | } |
| 1988 | |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1989 | if (port->flags & ASYNC_SUSPENDED) { |
| 1990 | const struct uart_ops *ops = uport->ops; |
Russell King | ee31b33 | 2005-11-13 15:28:51 +0000 | [diff] [blame] | 1991 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1992 | |
Russell King | 9d778a6 | 2008-02-04 22:27:51 -0800 | [diff] [blame] | 1993 | uart_change_pm(state, 0); |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 1994 | spin_lock_irq(&uport->lock); |
| 1995 | ops->set_mctrl(uport, 0); |
| 1996 | spin_unlock_irq(&uport->lock); |
Stanislav Brabec | 4547be7 | 2009-12-02 16:20:56 +0100 | [diff] [blame] | 1997 | if (console_suspend_enabled || !uart_console(uport)) { |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 1998 | /* Protected by port mutex for now */ |
| 1999 | struct tty_struct *tty = port->tty; |
Stanislav Brabec | 4547be7 | 2009-12-02 16:20:56 +0100 | [diff] [blame] | 2000 | ret = ops->startup(uport); |
| 2001 | if (ret == 0) { |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 2002 | if (tty) |
| 2003 | uart_change_speed(tty, state, NULL); |
Stanislav Brabec | 4547be7 | 2009-12-02 16:20:56 +0100 | [diff] [blame] | 2004 | spin_lock_irq(&uport->lock); |
| 2005 | ops->set_mctrl(uport, uport->mctrl); |
| 2006 | ops->start_tx(uport); |
| 2007 | spin_unlock_irq(&uport->lock); |
| 2008 | set_bit(ASYNCB_INITIALIZED, &port->flags); |
| 2009 | } else { |
| 2010 | /* |
| 2011 | * Failed to resume - maybe hardware went away? |
| 2012 | * Clear the "initialized" flag so we won't try |
| 2013 | * to call the low level drivers shutdown method. |
| 2014 | */ |
Alan Cox | 1922513 | 2010-06-01 22:52:51 +0200 | [diff] [blame] | 2015 | uart_shutdown(tty, state); |
Stanislav Brabec | 4547be7 | 2009-12-02 16:20:56 +0100 | [diff] [blame] | 2016 | } |
Russell King | ee31b33 | 2005-11-13 15:28:51 +0000 | [diff] [blame] | 2017 | } |
Russell King | a6b93a9 | 2006-10-01 17:17:40 +0100 | [diff] [blame] | 2018 | |
Alan Cox | ccce6de | 2009-09-19 13:13:30 -0700 | [diff] [blame] | 2019 | clear_bit(ASYNCB_SUSPENDED, &port->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2020 | } |
| 2021 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2022 | mutex_unlock(&port->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2023 | |
| 2024 | return 0; |
| 2025 | } |
| 2026 | |
| 2027 | static inline void |
| 2028 | uart_report_port(struct uart_driver *drv, struct uart_port *port) |
| 2029 | { |
Russell King | 30b7a3b | 2005-09-03 15:30:21 +0100 | [diff] [blame] | 2030 | char address[64]; |
| 2031 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2032 | switch (port->iotype) { |
| 2033 | case UPIO_PORT: |
Andrew Morton | 9bde10a | 2008-10-13 10:35:42 +0100 | [diff] [blame] | 2034 | snprintf(address, sizeof(address), "I/O 0x%lx", port->iobase); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2035 | break; |
| 2036 | case UPIO_HUB6: |
Russell King | 30b7a3b | 2005-09-03 15:30:21 +0100 | [diff] [blame] | 2037 | snprintf(address, sizeof(address), |
Andrew Morton | 9bde10a | 2008-10-13 10:35:42 +0100 | [diff] [blame] | 2038 | "I/O 0x%lx offset 0x%x", port->iobase, port->hub6); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2039 | break; |
| 2040 | case UPIO_MEM: |
| 2041 | case UPIO_MEM32: |
Pantelis Antoniou | 21c614a | 2005-11-06 09:07:03 +0000 | [diff] [blame] | 2042 | case UPIO_AU: |
Zang Roy-r61911 | 3be91ec | 2006-06-30 02:29:58 -0700 | [diff] [blame] | 2043 | case UPIO_TSI: |
Russell King | 30b7a3b | 2005-09-03 15:30:21 +0100 | [diff] [blame] | 2044 | snprintf(address, sizeof(address), |
Josh Boyer | 4f640ef | 2007-07-23 18:43:44 -0700 | [diff] [blame] | 2045 | "MMIO 0x%llx", (unsigned long long)port->mapbase); |
Russell King | 30b7a3b | 2005-09-03 15:30:21 +0100 | [diff] [blame] | 2046 | break; |
| 2047 | default: |
| 2048 | strlcpy(address, "*unknown*", sizeof(address)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2049 | break; |
| 2050 | } |
Russell King | 30b7a3b | 2005-09-03 15:30:21 +0100 | [diff] [blame] | 2051 | |
Russell King | 0cf669d | 2005-10-31 11:42:22 +0000 | [diff] [blame] | 2052 | 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] | 2053 | port->dev ? dev_name(port->dev) : "", |
Russell King | 0cf669d | 2005-10-31 11:42:22 +0000 | [diff] [blame] | 2054 | port->dev ? ": " : "", |
David S. Miller | 8440838 | 2008-10-13 10:45:26 +0100 | [diff] [blame] | 2055 | drv->dev_name, |
| 2056 | drv->tty_driver->name_base + port->line, |
| 2057 | address, port->irq, uart_type(port)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2058 | } |
| 2059 | |
| 2060 | static void |
| 2061 | uart_configure_port(struct uart_driver *drv, struct uart_state *state, |
| 2062 | struct uart_port *port) |
| 2063 | { |
| 2064 | unsigned int flags; |
| 2065 | |
| 2066 | /* |
| 2067 | * If there isn't a port here, don't do anything further. |
| 2068 | */ |
| 2069 | if (!port->iobase && !port->mapbase && !port->membase) |
| 2070 | return; |
| 2071 | |
| 2072 | /* |
| 2073 | * Now do the auto configuration stuff. Note that config_port |
| 2074 | * is expected to claim the resources and map the port for us. |
| 2075 | */ |
David Daney | 8e23fcc | 2009-01-02 13:49:54 +0000 | [diff] [blame] | 2076 | flags = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2077 | if (port->flags & UPF_AUTO_IRQ) |
| 2078 | flags |= UART_CONFIG_IRQ; |
| 2079 | if (port->flags & UPF_BOOT_AUTOCONF) { |
David Daney | 8e23fcc | 2009-01-02 13:49:54 +0000 | [diff] [blame] | 2080 | if (!(port->flags & UPF_FIXED_TYPE)) { |
| 2081 | port->type = PORT_UNKNOWN; |
| 2082 | flags |= UART_CONFIG_TYPE; |
| 2083 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2084 | port->ops->config_port(port, flags); |
| 2085 | } |
| 2086 | |
| 2087 | if (port->type != PORT_UNKNOWN) { |
| 2088 | unsigned long flags; |
| 2089 | |
| 2090 | uart_report_port(drv, port); |
| 2091 | |
George G. Davis | 3689a0e | 2007-02-14 00:33:06 -0800 | [diff] [blame] | 2092 | /* Power up port for set_mctrl() */ |
| 2093 | uart_change_pm(state, 0); |
| 2094 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2095 | /* |
| 2096 | * Ensure that the modem control lines are de-activated. |
Yinghai Lu | c3e4642 | 2008-02-04 22:27:46 -0800 | [diff] [blame] | 2097 | * keep the DTR setting that is set in uart_set_options() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2098 | * We probably don't need a spinlock around this, but |
| 2099 | */ |
| 2100 | spin_lock_irqsave(&port->lock, flags); |
Yinghai Lu | c3e4642 | 2008-02-04 22:27:46 -0800 | [diff] [blame] | 2101 | port->ops->set_mctrl(port, port->mctrl & TIOCM_DTR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2102 | spin_unlock_irqrestore(&port->lock, flags); |
| 2103 | |
| 2104 | /* |
Russell King | 97d9722 | 2007-09-01 21:25:09 +0100 | [diff] [blame] | 2105 | * If this driver supports console, and it hasn't been |
| 2106 | * successfully registered yet, try to re-register it. |
| 2107 | * It may be that the port was not available. |
| 2108 | */ |
| 2109 | if (port->cons && !(port->cons->flags & CON_ENABLED)) |
| 2110 | register_console(port->cons); |
| 2111 | |
| 2112 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2113 | * Power down all ports by default, except the |
| 2114 | * console if we have one. |
| 2115 | */ |
| 2116 | if (!uart_console(port)) |
| 2117 | uart_change_pm(state, 3); |
| 2118 | } |
| 2119 | } |
| 2120 | |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 2121 | #ifdef CONFIG_CONSOLE_POLL |
| 2122 | |
| 2123 | static int uart_poll_init(struct tty_driver *driver, int line, char *options) |
| 2124 | { |
| 2125 | struct uart_driver *drv = driver->driver_state; |
| 2126 | struct uart_state *state = drv->state + line; |
| 2127 | struct uart_port *port; |
| 2128 | int baud = 9600; |
| 2129 | int bits = 8; |
| 2130 | int parity = 'n'; |
| 2131 | int flow = 'n'; |
Anton Vorontsov | c7f3e70 | 2012-09-24 14:27:53 -0700 | [diff] [blame] | 2132 | int ret; |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 2133 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 2134 | if (!state || !state->uart_port) |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 2135 | return -1; |
| 2136 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 2137 | port = state->uart_port; |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 2138 | if (!(port->ops->poll_get_char && port->ops->poll_put_char)) |
| 2139 | return -1; |
| 2140 | |
Anton Vorontsov | c7f3e70 | 2012-09-24 14:27:53 -0700 | [diff] [blame] | 2141 | if (port->ops->poll_init) { |
| 2142 | struct tty_port *tport = &state->port; |
| 2143 | |
| 2144 | ret = 0; |
| 2145 | mutex_lock(&tport->mutex); |
| 2146 | /* |
| 2147 | * We don't set ASYNCB_INITIALIZED as we only initialized the |
| 2148 | * hw, e.g. state->xmit is still uninitialized. |
| 2149 | */ |
| 2150 | if (!test_bit(ASYNCB_INITIALIZED, &tport->flags)) |
| 2151 | ret = port->ops->poll_init(port); |
| 2152 | mutex_unlock(&tport->mutex); |
| 2153 | if (ret) |
| 2154 | return ret; |
| 2155 | } |
| 2156 | |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 2157 | if (options) { |
| 2158 | uart_parse_options(options, &baud, &parity, &bits, &flow); |
| 2159 | return uart_set_options(port, NULL, baud, parity, bits, flow); |
| 2160 | } |
| 2161 | |
| 2162 | return 0; |
| 2163 | } |
| 2164 | |
| 2165 | static int uart_poll_get_char(struct tty_driver *driver, int line) |
| 2166 | { |
| 2167 | struct uart_driver *drv = driver->driver_state; |
| 2168 | struct uart_state *state = drv->state + line; |
| 2169 | struct uart_port *port; |
| 2170 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 2171 | if (!state || !state->uart_port) |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 2172 | return -1; |
| 2173 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 2174 | port = state->uart_port; |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 2175 | return port->ops->poll_get_char(port); |
| 2176 | } |
| 2177 | |
| 2178 | static void uart_poll_put_char(struct tty_driver *driver, int line, char ch) |
| 2179 | { |
| 2180 | struct uart_driver *drv = driver->driver_state; |
| 2181 | struct uart_state *state = drv->state + line; |
| 2182 | struct uart_port *port; |
| 2183 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 2184 | if (!state || !state->uart_port) |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 2185 | return; |
| 2186 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 2187 | port = state->uart_port; |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 2188 | port->ops->poll_put_char(port, ch); |
| 2189 | } |
| 2190 | #endif |
| 2191 | |
Jeff Dike | b68e31d | 2006-10-02 02:17:18 -0700 | [diff] [blame] | 2192 | static const struct tty_operations uart_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2193 | .open = uart_open, |
| 2194 | .close = uart_close, |
| 2195 | .write = uart_write, |
| 2196 | .put_char = uart_put_char, |
| 2197 | .flush_chars = uart_flush_chars, |
| 2198 | .write_room = uart_write_room, |
| 2199 | .chars_in_buffer= uart_chars_in_buffer, |
| 2200 | .flush_buffer = uart_flush_buffer, |
| 2201 | .ioctl = uart_ioctl, |
| 2202 | .throttle = uart_throttle, |
| 2203 | .unthrottle = uart_unthrottle, |
| 2204 | .send_xchar = uart_send_xchar, |
| 2205 | .set_termios = uart_set_termios, |
Alan Cox | 64e9159 | 2008-06-03 15:18:54 +0100 | [diff] [blame] | 2206 | .set_ldisc = uart_set_ldisc, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2207 | .stop = uart_stop, |
| 2208 | .start = uart_start, |
| 2209 | .hangup = uart_hangup, |
| 2210 | .break_ctl = uart_break_ctl, |
| 2211 | .wait_until_sent= uart_wait_until_sent, |
| 2212 | #ifdef CONFIG_PROC_FS |
Alexey Dobriyan | d196a94 | 2009-03-31 15:19:21 -0700 | [diff] [blame] | 2213 | .proc_fops = &uart_proc_fops, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2214 | #endif |
| 2215 | .tiocmget = uart_tiocmget, |
| 2216 | .tiocmset = uart_tiocmset, |
Alan Cox | d281da7 | 2010-09-16 18:21:24 +0100 | [diff] [blame] | 2217 | .get_icount = uart_get_icount, |
Jason Wessel | f2d937f | 2008-04-17 20:05:37 +0200 | [diff] [blame] | 2218 | #ifdef CONFIG_CONSOLE_POLL |
| 2219 | .poll_init = uart_poll_init, |
| 2220 | .poll_get_char = uart_poll_get_char, |
| 2221 | .poll_put_char = uart_poll_put_char, |
| 2222 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2223 | }; |
| 2224 | |
Alan Cox | de0c8cb | 2010-06-01 22:52:58 +0200 | [diff] [blame] | 2225 | static const struct tty_port_operations uart_port_ops = { |
Jiri Slaby | 0b1db83 | 2011-11-09 21:33:50 +0100 | [diff] [blame] | 2226 | .activate = uart_port_activate, |
| 2227 | .shutdown = uart_port_shutdown, |
Alan Cox | de0c8cb | 2010-06-01 22:52:58 +0200 | [diff] [blame] | 2228 | .carrier_raised = uart_carrier_raised, |
| 2229 | .dtr_rts = uart_dtr_rts, |
| 2230 | }; |
| 2231 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2232 | /** |
| 2233 | * uart_register_driver - register a driver with the uart core layer |
| 2234 | * @drv: low level driver structure |
| 2235 | * |
| 2236 | * Register a uart driver with the core driver. We in turn register |
| 2237 | * with the tty layer, and initialise the core driver per-port state. |
| 2238 | * |
| 2239 | * We have a proc file in /proc/tty/driver which is named after the |
| 2240 | * normal driver. |
| 2241 | * |
| 2242 | * drv->port should be NULL, and the per-port structures should be |
| 2243 | * registered using uart_add_one_port after this call has succeeded. |
| 2244 | */ |
| 2245 | int uart_register_driver(struct uart_driver *drv) |
| 2246 | { |
André Goddard Rosa | 9e845ab | 2009-10-25 11:16:32 -0200 | [diff] [blame] | 2247 | struct tty_driver *normal; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2248 | int i, retval; |
| 2249 | |
| 2250 | BUG_ON(drv->state); |
| 2251 | |
| 2252 | /* |
| 2253 | * Maybe we should be using a slab cache for this, especially if |
| 2254 | * we have a large number of ports to handle. |
| 2255 | */ |
Burman Yan | 8f31bb3 | 2007-02-14 00:33:07 -0800 | [diff] [blame] | 2256 | drv->state = kzalloc(sizeof(struct uart_state) * drv->nr, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2257 | if (!drv->state) |
| 2258 | goto out; |
| 2259 | |
André Goddard Rosa | 9e845ab | 2009-10-25 11:16:32 -0200 | [diff] [blame] | 2260 | normal = alloc_tty_driver(drv->nr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2261 | if (!normal) |
André Goddard Rosa | 9e845ab | 2009-10-25 11:16:32 -0200 | [diff] [blame] | 2262 | goto out_kfree; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2263 | |
| 2264 | drv->tty_driver = normal; |
| 2265 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2266 | normal->driver_name = drv->driver_name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2267 | normal->name = drv->dev_name; |
| 2268 | normal->major = drv->major; |
| 2269 | normal->minor_start = drv->minor; |
| 2270 | normal->type = TTY_DRIVER_TYPE_SERIAL; |
| 2271 | normal->subtype = SERIAL_TYPE_NORMAL; |
| 2272 | normal->init_termios = tty_std_termios; |
| 2273 | normal->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 2274 | normal->init_termios.c_ispeed = normal->init_termios.c_ospeed = 9600; |
Greg Kroah-Hartman | 331b831 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 2275 | normal->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2276 | normal->driver_state = drv; |
| 2277 | tty_set_operations(normal, &uart_ops); |
| 2278 | |
| 2279 | /* |
| 2280 | * Initialise the UART state(s). |
| 2281 | */ |
| 2282 | for (i = 0; i < drv->nr; i++) { |
| 2283 | struct uart_state *state = drv->state + i; |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2284 | struct tty_port *port = &state->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2285 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2286 | tty_port_init(port); |
Alan Cox | de0c8cb | 2010-06-01 22:52:58 +0200 | [diff] [blame] | 2287 | port->ops = &uart_port_ops; |
Jiri Slaby | 4cb0fbf | 2011-11-09 21:33:45 +0100 | [diff] [blame] | 2288 | port->close_delay = HZ / 2; /* .5 seconds */ |
| 2289 | port->closing_wait = 30 * HZ;/* 30 seconds */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2290 | } |
| 2291 | |
| 2292 | retval = tty_register_driver(normal); |
André Goddard Rosa | 9e845ab | 2009-10-25 11:16:32 -0200 | [diff] [blame] | 2293 | if (retval >= 0) |
| 2294 | return retval; |
| 2295 | |
| 2296 | put_tty_driver(normal); |
| 2297 | out_kfree: |
| 2298 | kfree(drv->state); |
| 2299 | out: |
| 2300 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2301 | } |
| 2302 | |
| 2303 | /** |
| 2304 | * uart_unregister_driver - remove a driver from the uart core layer |
| 2305 | * @drv: low level driver structure |
| 2306 | * |
| 2307 | * Remove all references to a driver from the core driver. The low |
| 2308 | * level driver must have removed all its ports via the |
| 2309 | * uart_remove_one_port() if it registered them with uart_add_one_port(). |
| 2310 | * (ie, drv->port == NULL) |
| 2311 | */ |
| 2312 | void uart_unregister_driver(struct uart_driver *drv) |
| 2313 | { |
| 2314 | struct tty_driver *p = drv->tty_driver; |
| 2315 | tty_unregister_driver(p); |
| 2316 | put_tty_driver(p); |
| 2317 | kfree(drv->state); |
Alan Cox | 1e66cded | 2012-05-14 14:51:22 +0100 | [diff] [blame] | 2318 | drv->state = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2319 | drv->tty_driver = NULL; |
| 2320 | } |
| 2321 | |
| 2322 | struct tty_driver *uart_console_device(struct console *co, int *index) |
| 2323 | { |
| 2324 | struct uart_driver *p = co->data; |
| 2325 | *index = co->index; |
| 2326 | return p->tty_driver; |
| 2327 | } |
| 2328 | |
Tomas Hlavacek | 6915c0e | 2012-09-06 03:17:18 +0200 | [diff] [blame] | 2329 | static ssize_t uart_get_attr_uartclk(struct device *dev, |
| 2330 | struct device_attribute *attr, char *buf) |
| 2331 | { |
| 2332 | int ret; |
Tomas Hlavacek | 6915c0e | 2012-09-06 03:17:18 +0200 | [diff] [blame] | 2333 | struct tty_port *port = dev_get_drvdata(dev); |
| 2334 | struct uart_state *state = container_of(port, struct uart_state, port); |
Tomas Hlavacek | b1b7991 | 2012-09-06 23:17:47 +0200 | [diff] [blame] | 2335 | |
Tomas Hlavacek | 6915c0e | 2012-09-06 03:17:18 +0200 | [diff] [blame] | 2336 | mutex_lock(&state->port.mutex); |
| 2337 | ret = snprintf(buf, PAGE_SIZE, "%d\n", state->uart_port->uartclk); |
| 2338 | mutex_unlock(&state->port.mutex); |
| 2339 | |
| 2340 | return ret; |
| 2341 | } |
| 2342 | |
| 2343 | static DEVICE_ATTR(uartclk, S_IRUSR | S_IRGRP, uart_get_attr_uartclk, NULL); |
| 2344 | |
| 2345 | static struct attribute *tty_dev_attrs[] = { |
| 2346 | &dev_attr_uartclk.attr, |
| 2347 | NULL, |
| 2348 | }; |
| 2349 | |
Tomas Hlavacek | b1b7991 | 2012-09-06 23:17:47 +0200 | [diff] [blame] | 2350 | static const struct attribute_group tty_dev_attr_group = { |
Tomas Hlavacek | 6915c0e | 2012-09-06 03:17:18 +0200 | [diff] [blame] | 2351 | .attrs = tty_dev_attrs, |
| 2352 | }; |
| 2353 | |
| 2354 | static const struct attribute_group *tty_dev_attr_groups[] = { |
| 2355 | &tty_dev_attr_group, |
| 2356 | NULL |
| 2357 | }; |
| 2358 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2359 | /** |
| 2360 | * uart_add_one_port - attach a driver-defined port structure |
| 2361 | * @drv: pointer to the uart low level driver structure for this port |
Randy Dunlap | 1b9894f | 2009-09-21 11:12:03 -0700 | [diff] [blame] | 2362 | * @uport: uart port structure to use for this port. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2363 | * |
| 2364 | * This allows the driver to register its own uart_port structure |
| 2365 | * with the core driver. The main purpose is to allow the low |
| 2366 | * level uart drivers to expand uart_port, rather than having yet |
| 2367 | * more levels of structures. |
| 2368 | */ |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2369 | 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] | 2370 | { |
| 2371 | struct uart_state *state; |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2372 | struct tty_port *port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2373 | int ret = 0; |
Guennadi Liakhovetski | b3b708f | 2007-10-16 01:24:02 -0700 | [diff] [blame] | 2374 | struct device *tty_dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2375 | |
| 2376 | BUG_ON(in_interrupt()); |
| 2377 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2378 | if (uport->line >= drv->nr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2379 | return -EINVAL; |
| 2380 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2381 | state = drv->state + uport->line; |
| 2382 | port = &state->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2383 | |
Arjan van de Ven | f392ecf | 2006-01-12 18:44:32 +0000 | [diff] [blame] | 2384 | mutex_lock(&port_mutex); |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2385 | mutex_lock(&port->mutex); |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 2386 | if (state->uart_port) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2387 | ret = -EINVAL; |
| 2388 | goto out; |
| 2389 | } |
| 2390 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2391 | state->uart_port = uport; |
Russell King | 97d9722 | 2007-09-01 21:25:09 +0100 | [diff] [blame] | 2392 | state->pm_state = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2393 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2394 | uport->cons = drv->cons; |
| 2395 | uport->state = state; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2396 | |
Russell King | 976ecd1 | 2005-07-03 21:05:45 +0100 | [diff] [blame] | 2397 | /* |
| 2398 | * If this port is a console, then the spinlock is already |
| 2399 | * initialised. |
| 2400 | */ |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2401 | if (!(uart_console(uport) && (uport->cons->flags & CON_ENABLED))) { |
| 2402 | spin_lock_init(&uport->lock); |
| 2403 | lockdep_set_class(&uport->lock, &port_lock_key); |
Ingo Molnar | 13e8359 | 2006-07-03 00:25:03 -0700 | [diff] [blame] | 2404 | } |
Russell King | 976ecd1 | 2005-07-03 21:05:45 +0100 | [diff] [blame] | 2405 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2406 | uart_configure_port(drv, state, uport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2407 | |
| 2408 | /* |
| 2409 | * Register the port whether it's detected or not. This allows |
| 2410 | * setserial to be used to alter this ports parameters. |
| 2411 | */ |
Tomas Hlavacek | b1b7991 | 2012-09-06 23:17:47 +0200 | [diff] [blame] | 2412 | tty_dev = tty_port_register_device_attr(port, drv->tty_driver, |
| 2413 | uport->line, uport->dev, port, tty_dev_attr_groups); |
Guennadi Liakhovetski | b3b708f | 2007-10-16 01:24:02 -0700 | [diff] [blame] | 2414 | if (likely(!IS_ERR(tty_dev))) { |
Simon Glass | 7735983 | 2012-01-19 11:28:56 -0800 | [diff] [blame] | 2415 | device_set_wakeup_capable(tty_dev, 1); |
| 2416 | } else { |
Guennadi Liakhovetski | b3b708f | 2007-10-16 01:24:02 -0700 | [diff] [blame] | 2417 | printk(KERN_ERR "Cannot register tty device on line %d\n", |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2418 | uport->line); |
Simon Glass | 7735983 | 2012-01-19 11:28:56 -0800 | [diff] [blame] | 2419 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2420 | |
| 2421 | /* |
Russell King | 68ac64c | 2006-04-30 11:13:50 +0100 | [diff] [blame] | 2422 | * Ensure UPF_DEAD is not set. |
| 2423 | */ |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2424 | uport->flags &= ~UPF_DEAD; |
Russell King | 68ac64c | 2006-04-30 11:13:50 +0100 | [diff] [blame] | 2425 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2426 | out: |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2427 | mutex_unlock(&port->mutex); |
Arjan van de Ven | f392ecf | 2006-01-12 18:44:32 +0000 | [diff] [blame] | 2428 | mutex_unlock(&port_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2429 | |
| 2430 | return ret; |
| 2431 | } |
| 2432 | |
| 2433 | /** |
| 2434 | * uart_remove_one_port - detach a driver defined port structure |
| 2435 | * @drv: pointer to the uart low level driver structure for this port |
Randy Dunlap | 1b9894f | 2009-09-21 11:12:03 -0700 | [diff] [blame] | 2436 | * @uport: uart port structure for this port |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2437 | * |
| 2438 | * This unhooks (and hangs up) the specified port structure from the |
| 2439 | * core driver. No further calls will be made to the low-level code |
| 2440 | * for this port. |
| 2441 | */ |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2442 | 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] | 2443 | { |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2444 | struct uart_state *state = drv->state + uport->line; |
| 2445 | struct tty_port *port = &state->port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2446 | |
| 2447 | BUG_ON(in_interrupt()); |
| 2448 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2449 | if (state->uart_port != uport) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2450 | printk(KERN_ALERT "Removing wrong port: %p != %p\n", |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2451 | state->uart_port, uport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2452 | |
Arjan van de Ven | f392ecf | 2006-01-12 18:44:32 +0000 | [diff] [blame] | 2453 | mutex_lock(&port_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2454 | |
| 2455 | /* |
Russell King | 68ac64c | 2006-04-30 11:13:50 +0100 | [diff] [blame] | 2456 | * Mark the port "dead" - this prevents any opens from |
| 2457 | * succeeding while we shut down the port. |
| 2458 | */ |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2459 | mutex_lock(&port->mutex); |
| 2460 | uport->flags |= UPF_DEAD; |
| 2461 | mutex_unlock(&port->mutex); |
Russell King | 68ac64c | 2006-04-30 11:13:50 +0100 | [diff] [blame] | 2462 | |
| 2463 | /* |
Greg Kroah-Hartman | aa4148c | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 2464 | * Remove the devices from the tty layer |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2465 | */ |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2466 | tty_unregister_device(drv->tty_driver, uport->line); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2467 | |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2468 | if (port->tty) |
| 2469 | tty_vhangup(port->tty); |
Russell King | 68ac64c | 2006-04-30 11:13:50 +0100 | [diff] [blame] | 2470 | |
| 2471 | /* |
Russell King | 68ac64c | 2006-04-30 11:13:50 +0100 | [diff] [blame] | 2472 | * Free the port IO and memory resources, if any. |
| 2473 | */ |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2474 | if (uport->type != PORT_UNKNOWN) |
| 2475 | uport->ops->release_port(uport); |
Russell King | 68ac64c | 2006-04-30 11:13:50 +0100 | [diff] [blame] | 2476 | |
| 2477 | /* |
| 2478 | * Indicate that there isn't a port here anymore. |
| 2479 | */ |
Alan Cox | a2bceae | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 2480 | uport->type = PORT_UNKNOWN; |
Russell King | 68ac64c | 2006-04-30 11:13:50 +0100 | [diff] [blame] | 2481 | |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 2482 | state->uart_port = NULL; |
Arjan van de Ven | f392ecf | 2006-01-12 18:44:32 +0000 | [diff] [blame] | 2483 | mutex_unlock(&port_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2484 | |
| 2485 | return 0; |
| 2486 | } |
| 2487 | |
| 2488 | /* |
| 2489 | * Are the two ports equivalent? |
| 2490 | */ |
| 2491 | int uart_match_port(struct uart_port *port1, struct uart_port *port2) |
| 2492 | { |
| 2493 | if (port1->iotype != port2->iotype) |
| 2494 | return 0; |
| 2495 | |
| 2496 | switch (port1->iotype) { |
| 2497 | case UPIO_PORT: |
| 2498 | return (port1->iobase == port2->iobase); |
| 2499 | case UPIO_HUB6: |
| 2500 | return (port1->iobase == port2->iobase) && |
| 2501 | (port1->hub6 == port2->hub6); |
| 2502 | case UPIO_MEM: |
Sergei Shtylyov | d21b55d | 2006-08-28 19:49:03 +0400 | [diff] [blame] | 2503 | case UPIO_MEM32: |
| 2504 | case UPIO_AU: |
| 2505 | case UPIO_TSI: |
Benjamin Herrenschmidt | 1624f00 | 2006-01-04 18:09:44 +0000 | [diff] [blame] | 2506 | return (port1->mapbase == port2->mapbase); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2507 | } |
| 2508 | return 0; |
| 2509 | } |
| 2510 | EXPORT_SYMBOL(uart_match_port); |
| 2511 | |
Jiri Slaby | 027d7da | 2011-11-09 21:33:43 +0100 | [diff] [blame] | 2512 | /** |
| 2513 | * uart_handle_dcd_change - handle a change of carrier detect state |
| 2514 | * @uport: uart_port structure for the open port |
| 2515 | * @status: new carrier detect status, nonzero if active |
| 2516 | */ |
| 2517 | void uart_handle_dcd_change(struct uart_port *uport, unsigned int status) |
| 2518 | { |
| 2519 | struct uart_state *state = uport->state; |
| 2520 | struct tty_port *port = &state->port; |
Alan Cox | 43eca0a | 2012-09-19 15:35:46 +0100 | [diff] [blame] | 2521 | struct tty_ldisc *ld = NULL; |
Jiri Slaby | 027d7da | 2011-11-09 21:33:43 +0100 | [diff] [blame] | 2522 | struct pps_event_time ts; |
Alan Cox | 43eca0a | 2012-09-19 15:35:46 +0100 | [diff] [blame] | 2523 | struct tty_struct *tty = port->tty; |
Jiri Slaby | 027d7da | 2011-11-09 21:33:43 +0100 | [diff] [blame] | 2524 | |
Alan Cox | 43eca0a | 2012-09-19 15:35:46 +0100 | [diff] [blame] | 2525 | if (tty) |
| 2526 | ld = tty_ldisc_ref(tty); |
Jiri Slaby | 027d7da | 2011-11-09 21:33:43 +0100 | [diff] [blame] | 2527 | if (ld && ld->ops->dcd_change) |
| 2528 | pps_get_ts(&ts); |
| 2529 | |
| 2530 | uport->icount.dcd++; |
| 2531 | #ifdef CONFIG_HARD_PPS |
| 2532 | if ((uport->flags & UPF_HARDPPS_CD) && status) |
| 2533 | hardpps(); |
| 2534 | #endif |
| 2535 | |
| 2536 | if (port->flags & ASYNC_CHECK_CD) { |
| 2537 | if (status) |
| 2538 | wake_up_interruptible(&port->open_wait); |
Alan Cox | 43eca0a | 2012-09-19 15:35:46 +0100 | [diff] [blame] | 2539 | else if (tty) |
| 2540 | tty_hangup(tty); |
Jiri Slaby | 027d7da | 2011-11-09 21:33:43 +0100 | [diff] [blame] | 2541 | } |
| 2542 | |
| 2543 | if (ld && ld->ops->dcd_change) |
Alan Cox | 43eca0a | 2012-09-19 15:35:46 +0100 | [diff] [blame] | 2544 | ld->ops->dcd_change(tty, status, &ts); |
Jiri Slaby | 027d7da | 2011-11-09 21:33:43 +0100 | [diff] [blame] | 2545 | if (ld) |
| 2546 | tty_ldisc_deref(ld); |
| 2547 | } |
| 2548 | EXPORT_SYMBOL_GPL(uart_handle_dcd_change); |
| 2549 | |
| 2550 | /** |
| 2551 | * uart_handle_cts_change - handle a change of clear-to-send state |
| 2552 | * @uport: uart_port structure for the open port |
| 2553 | * @status: new clear to send status, nonzero if active |
| 2554 | */ |
| 2555 | void uart_handle_cts_change(struct uart_port *uport, unsigned int status) |
| 2556 | { |
| 2557 | struct tty_port *port = &uport->state->port; |
| 2558 | struct tty_struct *tty = port->tty; |
| 2559 | |
| 2560 | uport->icount.cts++; |
| 2561 | |
Huang Shijie | f21ec3d | 2012-08-22 22:13:36 -0400 | [diff] [blame] | 2562 | if (tty_port_cts_enabled(port)) { |
Jiri Slaby | 027d7da | 2011-11-09 21:33:43 +0100 | [diff] [blame] | 2563 | if (tty->hw_stopped) { |
| 2564 | if (status) { |
| 2565 | tty->hw_stopped = 0; |
| 2566 | uport->ops->start_tx(uport); |
| 2567 | uart_write_wakeup(uport); |
| 2568 | } |
| 2569 | } else { |
| 2570 | if (!status) { |
| 2571 | tty->hw_stopped = 1; |
| 2572 | uport->ops->stop_tx(uport); |
| 2573 | } |
| 2574 | } |
| 2575 | } |
| 2576 | } |
| 2577 | EXPORT_SYMBOL_GPL(uart_handle_cts_change); |
| 2578 | |
Jiri Slaby | cf75525 | 2011-11-09 21:33:47 +0100 | [diff] [blame] | 2579 | /** |
| 2580 | * uart_insert_char - push a char to the uart layer |
| 2581 | * |
| 2582 | * User is responsible to call tty_flip_buffer_push when they are done with |
| 2583 | * insertion. |
| 2584 | * |
| 2585 | * @port: corresponding port |
| 2586 | * @status: state of the serial port RX buffer (LSR for 8250) |
| 2587 | * @overrun: mask of overrun bits in @status |
| 2588 | * @ch: character to push |
| 2589 | * @flag: flag for the character (see TTY_NORMAL and friends) |
| 2590 | */ |
Jiri Slaby | 027d7da | 2011-11-09 21:33:43 +0100 | [diff] [blame] | 2591 | void uart_insert_char(struct uart_port *port, unsigned int status, |
| 2592 | unsigned int overrun, unsigned int ch, unsigned int flag) |
| 2593 | { |
| 2594 | struct tty_struct *tty = port->state->port.tty; |
| 2595 | |
| 2596 | if ((status & port->ignore_status_mask & ~overrun) == 0) |
Corbin | dabfb35 | 2012-05-23 09:37:31 -0500 | [diff] [blame] | 2597 | if (tty_insert_flip_char(tty, ch, flag) == 0) |
| 2598 | ++port->icount.buf_overrun; |
Jiri Slaby | 027d7da | 2011-11-09 21:33:43 +0100 | [diff] [blame] | 2599 | |
| 2600 | /* |
| 2601 | * Overrun is special. Since it's reported immediately, |
| 2602 | * it doesn't affect the current character. |
| 2603 | */ |
| 2604 | if (status & ~port->ignore_status_mask & overrun) |
Corbin | dabfb35 | 2012-05-23 09:37:31 -0500 | [diff] [blame] | 2605 | if (tty_insert_flip_char(tty, 0, TTY_OVERRUN) == 0) |
| 2606 | ++port->icount.buf_overrun; |
Jiri Slaby | 027d7da | 2011-11-09 21:33:43 +0100 | [diff] [blame] | 2607 | } |
| 2608 | EXPORT_SYMBOL_GPL(uart_insert_char); |
| 2609 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2610 | EXPORT_SYMBOL(uart_write_wakeup); |
| 2611 | EXPORT_SYMBOL(uart_register_driver); |
| 2612 | EXPORT_SYMBOL(uart_unregister_driver); |
| 2613 | EXPORT_SYMBOL(uart_suspend_port); |
| 2614 | EXPORT_SYMBOL(uart_resume_port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2615 | EXPORT_SYMBOL(uart_add_one_port); |
| 2616 | EXPORT_SYMBOL(uart_remove_one_port); |
| 2617 | |
| 2618 | MODULE_DESCRIPTION("Serial driver core"); |
| 2619 | MODULE_LICENSE("GPL"); |