1ab4382d2SGreg Kroah-Hartman /* 2ab4382d2SGreg Kroah-Hartman * Driver core for serial ports 3ab4382d2SGreg Kroah-Hartman * 4ab4382d2SGreg Kroah-Hartman * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. 5ab4382d2SGreg Kroah-Hartman * 6ab4382d2SGreg Kroah-Hartman * Copyright 1999 ARM Limited 7ab4382d2SGreg Kroah-Hartman * Copyright (C) 2000-2001 Deep Blue Solutions Ltd. 8ab4382d2SGreg Kroah-Hartman * 9ab4382d2SGreg Kroah-Hartman * This program is free software; you can redistribute it and/or modify 10ab4382d2SGreg Kroah-Hartman * it under the terms of the GNU General Public License as published by 11ab4382d2SGreg Kroah-Hartman * the Free Software Foundation; either version 2 of the License, or 12ab4382d2SGreg Kroah-Hartman * (at your option) any later version. 13ab4382d2SGreg Kroah-Hartman * 14ab4382d2SGreg Kroah-Hartman * This program is distributed in the hope that it will be useful, 15ab4382d2SGreg Kroah-Hartman * but WITHOUT ANY WARRANTY; without even the implied warranty of 16ab4382d2SGreg Kroah-Hartman * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17ab4382d2SGreg Kroah-Hartman * GNU General Public License for more details. 18ab4382d2SGreg Kroah-Hartman * 19ab4382d2SGreg Kroah-Hartman * You should have received a copy of the GNU General Public License 20ab4382d2SGreg Kroah-Hartman * along with this program; if not, write to the Free Software 21ab4382d2SGreg Kroah-Hartman * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 22ab4382d2SGreg Kroah-Hartman */ 23ab4382d2SGreg Kroah-Hartman #include <linux/module.h> 24ab4382d2SGreg Kroah-Hartman #include <linux/tty.h> 25027d7dacSJiri Slaby #include <linux/tty_flip.h> 26ab4382d2SGreg Kroah-Hartman #include <linux/slab.h> 27ab4382d2SGreg Kroah-Hartman #include <linux/init.h> 28ab4382d2SGreg Kroah-Hartman #include <linux/console.h> 29ab4382d2SGreg Kroah-Hartman #include <linux/proc_fs.h> 30ab4382d2SGreg Kroah-Hartman #include <linux/seq_file.h> 31ab4382d2SGreg Kroah-Hartman #include <linux/device.h> 32ab4382d2SGreg Kroah-Hartman #include <linux/serial.h> /* for serial_state and serial_icounter_struct */ 33ab4382d2SGreg Kroah-Hartman #include <linux/serial_core.h> 34ab4382d2SGreg Kroah-Hartman #include <linux/delay.h> 35ab4382d2SGreg Kroah-Hartman #include <linux/mutex.h> 36ab4382d2SGreg Kroah-Hartman 37ab4382d2SGreg Kroah-Hartman #include <asm/irq.h> 38ab4382d2SGreg Kroah-Hartman #include <asm/uaccess.h> 39ab4382d2SGreg Kroah-Hartman 40ab4382d2SGreg Kroah-Hartman /* 41ab4382d2SGreg Kroah-Hartman * This is used to lock changes in serial line configuration. 42ab4382d2SGreg Kroah-Hartman */ 43ab4382d2SGreg Kroah-Hartman static DEFINE_MUTEX(port_mutex); 44ab4382d2SGreg Kroah-Hartman 45ab4382d2SGreg Kroah-Hartman /* 46ab4382d2SGreg Kroah-Hartman * lockdep: port->lock is initialized in two places, but we 47ab4382d2SGreg Kroah-Hartman * want only one lock-class: 48ab4382d2SGreg Kroah-Hartman */ 49ab4382d2SGreg Kroah-Hartman static struct lock_class_key port_lock_key; 50ab4382d2SGreg Kroah-Hartman 51ab4382d2SGreg Kroah-Hartman #define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8) 52ab4382d2SGreg Kroah-Hartman 53ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_SERIAL_CORE_CONSOLE 54ab4382d2SGreg Kroah-Hartman #define uart_console(port) ((port)->cons && (port)->cons->index == (port)->line) 55ab4382d2SGreg Kroah-Hartman #else 56ab4382d2SGreg Kroah-Hartman #define uart_console(port) (0) 57ab4382d2SGreg Kroah-Hartman #endif 58ab4382d2SGreg Kroah-Hartman 59ab4382d2SGreg Kroah-Hartman static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, 60ab4382d2SGreg Kroah-Hartman struct ktermios *old_termios); 611f33a51dSJiri Slaby static void uart_wait_until_sent(struct tty_struct *tty, int timeout); 62ab4382d2SGreg Kroah-Hartman static void uart_change_pm(struct uart_state *state, int pm_state); 63ab4382d2SGreg Kroah-Hartman 64b922e19dSJiri Slaby static void uart_port_shutdown(struct tty_port *port); 65b922e19dSJiri Slaby 66ab4382d2SGreg Kroah-Hartman /* 67ab4382d2SGreg Kroah-Hartman * This routine is used by the interrupt handler to schedule processing in 68ab4382d2SGreg Kroah-Hartman * the software interrupt portion of the driver. 69ab4382d2SGreg Kroah-Hartman */ 70ab4382d2SGreg Kroah-Hartman void uart_write_wakeup(struct uart_port *port) 71ab4382d2SGreg Kroah-Hartman { 72ab4382d2SGreg Kroah-Hartman struct uart_state *state = port->state; 73ab4382d2SGreg Kroah-Hartman /* 74ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 75ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 76ab4382d2SGreg Kroah-Hartman */ 77ab4382d2SGreg Kroah-Hartman BUG_ON(!state); 786a3e492bSJiri Slaby tty_wakeup(state->port.tty); 79ab4382d2SGreg Kroah-Hartman } 80ab4382d2SGreg Kroah-Hartman 81ab4382d2SGreg Kroah-Hartman static void uart_stop(struct tty_struct *tty) 82ab4382d2SGreg Kroah-Hartman { 83ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 84ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 85ab4382d2SGreg Kroah-Hartman unsigned long flags; 86ab4382d2SGreg Kroah-Hartman 87ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 88ab4382d2SGreg Kroah-Hartman port->ops->stop_tx(port); 89ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 90ab4382d2SGreg Kroah-Hartman } 91ab4382d2SGreg Kroah-Hartman 92ab4382d2SGreg Kroah-Hartman static void __uart_start(struct tty_struct *tty) 93ab4382d2SGreg Kroah-Hartman { 94ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 95ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 96ab4382d2SGreg Kroah-Hartman 97ab4382d2SGreg Kroah-Hartman if (!uart_circ_empty(&state->xmit) && state->xmit.buf && 98ab4382d2SGreg Kroah-Hartman !tty->stopped && !tty->hw_stopped) 99ab4382d2SGreg Kroah-Hartman port->ops->start_tx(port); 100ab4382d2SGreg Kroah-Hartman } 101ab4382d2SGreg Kroah-Hartman 102ab4382d2SGreg Kroah-Hartman static void uart_start(struct tty_struct *tty) 103ab4382d2SGreg Kroah-Hartman { 104ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 105ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 106ab4382d2SGreg Kroah-Hartman unsigned long flags; 107ab4382d2SGreg Kroah-Hartman 108ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 109ab4382d2SGreg Kroah-Hartman __uart_start(tty); 110ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 111ab4382d2SGreg Kroah-Hartman } 112ab4382d2SGreg Kroah-Hartman 113ab4382d2SGreg Kroah-Hartman static inline void 114ab4382d2SGreg Kroah-Hartman uart_update_mctrl(struct uart_port *port, unsigned int set, unsigned int clear) 115ab4382d2SGreg Kroah-Hartman { 116ab4382d2SGreg Kroah-Hartman unsigned long flags; 117ab4382d2SGreg Kroah-Hartman unsigned int old; 118ab4382d2SGreg Kroah-Hartman 119ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 120ab4382d2SGreg Kroah-Hartman old = port->mctrl; 121ab4382d2SGreg Kroah-Hartman port->mctrl = (old & ~clear) | set; 122ab4382d2SGreg Kroah-Hartman if (old != port->mctrl) 123ab4382d2SGreg Kroah-Hartman port->ops->set_mctrl(port, port->mctrl); 124ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 125ab4382d2SGreg Kroah-Hartman } 126ab4382d2SGreg Kroah-Hartman 127ab4382d2SGreg Kroah-Hartman #define uart_set_mctrl(port, set) uart_update_mctrl(port, set, 0) 128ab4382d2SGreg Kroah-Hartman #define uart_clear_mctrl(port, clear) uart_update_mctrl(port, 0, clear) 129ab4382d2SGreg Kroah-Hartman 130ab4382d2SGreg Kroah-Hartman /* 131ab4382d2SGreg Kroah-Hartman * Startup the port. This will be called once per open. All calls 132ab4382d2SGreg Kroah-Hartman * will be serialised by the per-port mutex. 133ab4382d2SGreg Kroah-Hartman */ 134c0d92be6SJiri Slaby static int uart_port_startup(struct tty_struct *tty, struct uart_state *state, 135c0d92be6SJiri Slaby int init_hw) 136ab4382d2SGreg Kroah-Hartman { 137ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 138ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 139ab4382d2SGreg Kroah-Hartman unsigned long page; 140ab4382d2SGreg Kroah-Hartman int retval = 0; 141ab4382d2SGreg Kroah-Hartman 142ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) 143c0d92be6SJiri Slaby return 1; 144ab4382d2SGreg Kroah-Hartman 145ab4382d2SGreg Kroah-Hartman /* 146ab4382d2SGreg Kroah-Hartman * Initialise and allocate the transmit and temporary 147ab4382d2SGreg Kroah-Hartman * buffer. 148ab4382d2SGreg Kroah-Hartman */ 149ab4382d2SGreg Kroah-Hartman if (!state->xmit.buf) { 150ab4382d2SGreg Kroah-Hartman /* This is protected by the per port mutex */ 151ab4382d2SGreg Kroah-Hartman page = get_zeroed_page(GFP_KERNEL); 152ab4382d2SGreg Kroah-Hartman if (!page) 153ab4382d2SGreg Kroah-Hartman return -ENOMEM; 154ab4382d2SGreg Kroah-Hartman 155ab4382d2SGreg Kroah-Hartman state->xmit.buf = (unsigned char *) page; 156ab4382d2SGreg Kroah-Hartman uart_circ_clear(&state->xmit); 157ab4382d2SGreg Kroah-Hartman } 158ab4382d2SGreg Kroah-Hartman 159ab4382d2SGreg Kroah-Hartman retval = uport->ops->startup(uport); 160ab4382d2SGreg Kroah-Hartman if (retval == 0) { 161c7d7abffSJiri Slaby if (uart_console(uport) && uport->cons->cflag) { 162adc8d746SAlan Cox tty->termios.c_cflag = uport->cons->cflag; 163c7d7abffSJiri Slaby uport->cons->cflag = 0; 164c7d7abffSJiri Slaby } 165ab4382d2SGreg Kroah-Hartman /* 166ab4382d2SGreg Kroah-Hartman * Initialise the hardware port settings. 167ab4382d2SGreg Kroah-Hartman */ 168ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 169ab4382d2SGreg Kroah-Hartman 170c7d7abffSJiri Slaby if (init_hw) { 171ab4382d2SGreg Kroah-Hartman /* 172ab4382d2SGreg Kroah-Hartman * Setup the RTS and DTR signals once the 173ab4382d2SGreg Kroah-Hartman * port is open and ready to respond. 174ab4382d2SGreg Kroah-Hartman */ 175adc8d746SAlan Cox if (tty->termios.c_cflag & CBAUD) 176ab4382d2SGreg Kroah-Hartman uart_set_mctrl(uport, TIOCM_RTS | TIOCM_DTR); 177ab4382d2SGreg Kroah-Hartman } 178ab4382d2SGreg Kroah-Hartman 179f21ec3d2SHuang Shijie if (tty_port_cts_enabled(port)) { 180ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 181ab4382d2SGreg Kroah-Hartman if (!(uport->ops->get_mctrl(uport) & TIOCM_CTS)) 182ab4382d2SGreg Kroah-Hartman tty->hw_stopped = 1; 183ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 184ab4382d2SGreg Kroah-Hartman } 185ab4382d2SGreg Kroah-Hartman } 186ab4382d2SGreg Kroah-Hartman 1870055197eSJiri Slaby /* 1880055197eSJiri Slaby * This is to allow setserial on this port. People may want to set 1890055197eSJiri Slaby * port/irq/type and then reconfigure the port properly if it failed 1900055197eSJiri Slaby * now. 1910055197eSJiri Slaby */ 192ab4382d2SGreg Kroah-Hartman if (retval && capable(CAP_SYS_ADMIN)) 193c0d92be6SJiri Slaby return 1; 194c0d92be6SJiri Slaby 195c0d92be6SJiri Slaby return retval; 196c0d92be6SJiri Slaby } 197c0d92be6SJiri Slaby 198c0d92be6SJiri Slaby static int uart_startup(struct tty_struct *tty, struct uart_state *state, 199c0d92be6SJiri Slaby int init_hw) 200c0d92be6SJiri Slaby { 201c0d92be6SJiri Slaby struct tty_port *port = &state->port; 202c0d92be6SJiri Slaby int retval; 203c0d92be6SJiri Slaby 204c0d92be6SJiri Slaby if (port->flags & ASYNC_INITIALIZED) 205c0d92be6SJiri Slaby return 0; 206c0d92be6SJiri Slaby 207c0d92be6SJiri Slaby /* 208c0d92be6SJiri Slaby * Set the TTY IO error marker - we will only clear this 209c0d92be6SJiri Slaby * once we have successfully opened the port. 210c0d92be6SJiri Slaby */ 211c0d92be6SJiri Slaby set_bit(TTY_IO_ERROR, &tty->flags); 212c0d92be6SJiri Slaby 213c0d92be6SJiri Slaby retval = uart_port_startup(tty, state, init_hw); 214c0d92be6SJiri Slaby if (!retval) { 215c0d92be6SJiri Slaby set_bit(ASYNCB_INITIALIZED, &port->flags); 216c0d92be6SJiri Slaby clear_bit(TTY_IO_ERROR, &tty->flags); 217c0d92be6SJiri Slaby } else if (retval > 0) 218ab4382d2SGreg Kroah-Hartman retval = 0; 219ab4382d2SGreg Kroah-Hartman 220ab4382d2SGreg Kroah-Hartman return retval; 221ab4382d2SGreg Kroah-Hartman } 222ab4382d2SGreg Kroah-Hartman 223ab4382d2SGreg Kroah-Hartman /* 224ab4382d2SGreg Kroah-Hartman * This routine will shutdown a serial port; interrupts are disabled, and 225ab4382d2SGreg Kroah-Hartman * DTR is dropped if the hangup on close termio flag is on. Calls to 226ab4382d2SGreg Kroah-Hartman * uart_shutdown are serialised by the per-port semaphore. 227ab4382d2SGreg Kroah-Hartman */ 228ab4382d2SGreg Kroah-Hartman static void uart_shutdown(struct tty_struct *tty, struct uart_state *state) 229ab4382d2SGreg Kroah-Hartman { 230ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 231ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 232ab4382d2SGreg Kroah-Hartman 233ab4382d2SGreg Kroah-Hartman /* 234ab4382d2SGreg Kroah-Hartman * Set the TTY IO error marker 235ab4382d2SGreg Kroah-Hartman */ 236ab4382d2SGreg Kroah-Hartman if (tty) 237ab4382d2SGreg Kroah-Hartman set_bit(TTY_IO_ERROR, &tty->flags); 238ab4382d2SGreg Kroah-Hartman 239ab4382d2SGreg Kroah-Hartman if (test_and_clear_bit(ASYNCB_INITIALIZED, &port->flags)) { 240ab4382d2SGreg Kroah-Hartman /* 241ab4382d2SGreg Kroah-Hartman * Turn off DTR and RTS early. 242ab4382d2SGreg Kroah-Hartman */ 243adc8d746SAlan Cox if (!tty || (tty->termios.c_cflag & HUPCL)) 244ab4382d2SGreg Kroah-Hartman uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); 245ab4382d2SGreg Kroah-Hartman 246b922e19dSJiri Slaby uart_port_shutdown(port); 247ab4382d2SGreg Kroah-Hartman } 248ab4382d2SGreg Kroah-Hartman 249ab4382d2SGreg Kroah-Hartman /* 250d208a3bfSDoug Anderson * It's possible for shutdown to be called after suspend if we get 251d208a3bfSDoug Anderson * a DCD drop (hangup) at just the right time. Clear suspended bit so 252d208a3bfSDoug Anderson * we don't try to resume a port that has been shutdown. 253ab4382d2SGreg Kroah-Hartman */ 254d208a3bfSDoug Anderson clear_bit(ASYNCB_SUSPENDED, &port->flags); 255ab4382d2SGreg Kroah-Hartman 256ab4382d2SGreg Kroah-Hartman /* 257ab4382d2SGreg Kroah-Hartman * Free the transmit buffer page. 258ab4382d2SGreg Kroah-Hartman */ 259ab4382d2SGreg Kroah-Hartman if (state->xmit.buf) { 260ab4382d2SGreg Kroah-Hartman free_page((unsigned long)state->xmit.buf); 261ab4382d2SGreg Kroah-Hartman state->xmit.buf = NULL; 262ab4382d2SGreg Kroah-Hartman } 263ab4382d2SGreg Kroah-Hartman } 264ab4382d2SGreg Kroah-Hartman 265ab4382d2SGreg Kroah-Hartman /** 266ab4382d2SGreg Kroah-Hartman * uart_update_timeout - update per-port FIFO timeout. 267ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port 268ab4382d2SGreg Kroah-Hartman * @cflag: termios cflag value 269ab4382d2SGreg Kroah-Hartman * @baud: speed of the port 270ab4382d2SGreg Kroah-Hartman * 271ab4382d2SGreg Kroah-Hartman * Set the port FIFO timeout value. The @cflag value should 272ab4382d2SGreg Kroah-Hartman * reflect the actual hardware settings. 273ab4382d2SGreg Kroah-Hartman */ 274ab4382d2SGreg Kroah-Hartman void 275ab4382d2SGreg Kroah-Hartman uart_update_timeout(struct uart_port *port, unsigned int cflag, 276ab4382d2SGreg Kroah-Hartman unsigned int baud) 277ab4382d2SGreg Kroah-Hartman { 278ab4382d2SGreg Kroah-Hartman unsigned int bits; 279ab4382d2SGreg Kroah-Hartman 280ab4382d2SGreg Kroah-Hartman /* byte size and parity */ 281ab4382d2SGreg Kroah-Hartman switch (cflag & CSIZE) { 282ab4382d2SGreg Kroah-Hartman case CS5: 283ab4382d2SGreg Kroah-Hartman bits = 7; 284ab4382d2SGreg Kroah-Hartman break; 285ab4382d2SGreg Kroah-Hartman case CS6: 286ab4382d2SGreg Kroah-Hartman bits = 8; 287ab4382d2SGreg Kroah-Hartman break; 288ab4382d2SGreg Kroah-Hartman case CS7: 289ab4382d2SGreg Kroah-Hartman bits = 9; 290ab4382d2SGreg Kroah-Hartman break; 291ab4382d2SGreg Kroah-Hartman default: 292ab4382d2SGreg Kroah-Hartman bits = 10; 293ab4382d2SGreg Kroah-Hartman break; /* CS8 */ 294ab4382d2SGreg Kroah-Hartman } 295ab4382d2SGreg Kroah-Hartman 296ab4382d2SGreg Kroah-Hartman if (cflag & CSTOPB) 297ab4382d2SGreg Kroah-Hartman bits++; 298ab4382d2SGreg Kroah-Hartman if (cflag & PARENB) 299ab4382d2SGreg Kroah-Hartman bits++; 300ab4382d2SGreg Kroah-Hartman 301ab4382d2SGreg Kroah-Hartman /* 302ab4382d2SGreg Kroah-Hartman * The total number of bits to be transmitted in the fifo. 303ab4382d2SGreg Kroah-Hartman */ 304ab4382d2SGreg Kroah-Hartman bits = bits * port->fifosize; 305ab4382d2SGreg Kroah-Hartman 306ab4382d2SGreg Kroah-Hartman /* 307ab4382d2SGreg Kroah-Hartman * Figure the timeout to send the above number of bits. 308ab4382d2SGreg Kroah-Hartman * Add .02 seconds of slop 309ab4382d2SGreg Kroah-Hartman */ 310ab4382d2SGreg Kroah-Hartman port->timeout = (HZ * bits) / baud + HZ/50; 311ab4382d2SGreg Kroah-Hartman } 312ab4382d2SGreg Kroah-Hartman 313ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_update_timeout); 314ab4382d2SGreg Kroah-Hartman 315ab4382d2SGreg Kroah-Hartman /** 316ab4382d2SGreg Kroah-Hartman * uart_get_baud_rate - return baud rate for a particular port 317ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port in question. 318ab4382d2SGreg Kroah-Hartman * @termios: desired termios settings. 319ab4382d2SGreg Kroah-Hartman * @old: old termios (or NULL) 320ab4382d2SGreg Kroah-Hartman * @min: minimum acceptable baud rate 321ab4382d2SGreg Kroah-Hartman * @max: maximum acceptable baud rate 322ab4382d2SGreg Kroah-Hartman * 323ab4382d2SGreg Kroah-Hartman * Decode the termios structure into a numeric baud rate, 324ab4382d2SGreg Kroah-Hartman * taking account of the magic 38400 baud rate (with spd_* 325ab4382d2SGreg Kroah-Hartman * flags), and mapping the %B0 rate to 9600 baud. 326ab4382d2SGreg Kroah-Hartman * 327ab4382d2SGreg Kroah-Hartman * If the new baud rate is invalid, try the old termios setting. 328ab4382d2SGreg Kroah-Hartman * If it's still invalid, we try 9600 baud. 329ab4382d2SGreg Kroah-Hartman * 330ab4382d2SGreg Kroah-Hartman * Update the @termios structure to reflect the baud rate 331ab4382d2SGreg Kroah-Hartman * we're actually going to be using. Don't do this for the case 332ab4382d2SGreg Kroah-Hartman * where B0 is requested ("hang up"). 333ab4382d2SGreg Kroah-Hartman */ 334ab4382d2SGreg Kroah-Hartman unsigned int 335ab4382d2SGreg Kroah-Hartman uart_get_baud_rate(struct uart_port *port, struct ktermios *termios, 336ab4382d2SGreg Kroah-Hartman struct ktermios *old, unsigned int min, unsigned int max) 337ab4382d2SGreg Kroah-Hartman { 338ab4382d2SGreg Kroah-Hartman unsigned int try, baud, altbaud = 38400; 339ab4382d2SGreg Kroah-Hartman int hung_up = 0; 340ab4382d2SGreg Kroah-Hartman upf_t flags = port->flags & UPF_SPD_MASK; 341ab4382d2SGreg Kroah-Hartman 342ab4382d2SGreg Kroah-Hartman if (flags == UPF_SPD_HI) 343ab4382d2SGreg Kroah-Hartman altbaud = 57600; 344ab4382d2SGreg Kroah-Hartman else if (flags == UPF_SPD_VHI) 345ab4382d2SGreg Kroah-Hartman altbaud = 115200; 346ab4382d2SGreg Kroah-Hartman else if (flags == UPF_SPD_SHI) 347ab4382d2SGreg Kroah-Hartman altbaud = 230400; 348ab4382d2SGreg Kroah-Hartman else if (flags == UPF_SPD_WARP) 349ab4382d2SGreg Kroah-Hartman altbaud = 460800; 350ab4382d2SGreg Kroah-Hartman 351ab4382d2SGreg Kroah-Hartman for (try = 0; try < 2; try++) { 352ab4382d2SGreg Kroah-Hartman baud = tty_termios_baud_rate(termios); 353ab4382d2SGreg Kroah-Hartman 354ab4382d2SGreg Kroah-Hartman /* 355ab4382d2SGreg Kroah-Hartman * The spd_hi, spd_vhi, spd_shi, spd_warp kludge... 356ab4382d2SGreg Kroah-Hartman * Die! Die! Die! 357ab4382d2SGreg Kroah-Hartman */ 358ab4382d2SGreg Kroah-Hartman if (baud == 38400) 359ab4382d2SGreg Kroah-Hartman baud = altbaud; 360ab4382d2SGreg Kroah-Hartman 361ab4382d2SGreg Kroah-Hartman /* 362ab4382d2SGreg Kroah-Hartman * Special case: B0 rate. 363ab4382d2SGreg Kroah-Hartman */ 364ab4382d2SGreg Kroah-Hartman if (baud == 0) { 365ab4382d2SGreg Kroah-Hartman hung_up = 1; 366ab4382d2SGreg Kroah-Hartman baud = 9600; 367ab4382d2SGreg Kroah-Hartman } 368ab4382d2SGreg Kroah-Hartman 369ab4382d2SGreg Kroah-Hartman if (baud >= min && baud <= max) 370ab4382d2SGreg Kroah-Hartman return baud; 371ab4382d2SGreg Kroah-Hartman 372ab4382d2SGreg Kroah-Hartman /* 373ab4382d2SGreg Kroah-Hartman * Oops, the quotient was zero. Try again with 374ab4382d2SGreg Kroah-Hartman * the old baud rate if possible. 375ab4382d2SGreg Kroah-Hartman */ 376ab4382d2SGreg Kroah-Hartman termios->c_cflag &= ~CBAUD; 377ab4382d2SGreg Kroah-Hartman if (old) { 378ab4382d2SGreg Kroah-Hartman baud = tty_termios_baud_rate(old); 379ab4382d2SGreg Kroah-Hartman if (!hung_up) 380ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 381ab4382d2SGreg Kroah-Hartman baud, baud); 382ab4382d2SGreg Kroah-Hartman old = NULL; 383ab4382d2SGreg Kroah-Hartman continue; 384ab4382d2SGreg Kroah-Hartman } 385ab4382d2SGreg Kroah-Hartman 386ab4382d2SGreg Kroah-Hartman /* 387ab4382d2SGreg Kroah-Hartman * As a last resort, if the range cannot be met then clip to 388ab4382d2SGreg Kroah-Hartman * the nearest chip supported rate. 389ab4382d2SGreg Kroah-Hartman */ 390ab4382d2SGreg Kroah-Hartman if (!hung_up) { 391ab4382d2SGreg Kroah-Hartman if (baud <= min) 392ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 393ab4382d2SGreg Kroah-Hartman min + 1, min + 1); 394ab4382d2SGreg Kroah-Hartman else 395ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 396ab4382d2SGreg Kroah-Hartman max - 1, max - 1); 397ab4382d2SGreg Kroah-Hartman } 398ab4382d2SGreg Kroah-Hartman } 399ab4382d2SGreg Kroah-Hartman /* Should never happen */ 400ab4382d2SGreg Kroah-Hartman WARN_ON(1); 401ab4382d2SGreg Kroah-Hartman return 0; 402ab4382d2SGreg Kroah-Hartman } 403ab4382d2SGreg Kroah-Hartman 404ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_get_baud_rate); 405ab4382d2SGreg Kroah-Hartman 406ab4382d2SGreg Kroah-Hartman /** 407ab4382d2SGreg Kroah-Hartman * uart_get_divisor - return uart clock divisor 408ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port. 409ab4382d2SGreg Kroah-Hartman * @baud: desired baud rate 410ab4382d2SGreg Kroah-Hartman * 411ab4382d2SGreg Kroah-Hartman * Calculate the uart clock divisor for the port. 412ab4382d2SGreg Kroah-Hartman */ 413ab4382d2SGreg Kroah-Hartman unsigned int 414ab4382d2SGreg Kroah-Hartman uart_get_divisor(struct uart_port *port, unsigned int baud) 415ab4382d2SGreg Kroah-Hartman { 416ab4382d2SGreg Kroah-Hartman unsigned int quot; 417ab4382d2SGreg Kroah-Hartman 418ab4382d2SGreg Kroah-Hartman /* 419ab4382d2SGreg Kroah-Hartman * Old custom speed handling. 420ab4382d2SGreg Kroah-Hartman */ 421ab4382d2SGreg Kroah-Hartman if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) 422ab4382d2SGreg Kroah-Hartman quot = port->custom_divisor; 423ab4382d2SGreg Kroah-Hartman else 42497d24634SUwe Kleine-König quot = DIV_ROUND_CLOSEST(port->uartclk, 16 * baud); 425ab4382d2SGreg Kroah-Hartman 426ab4382d2SGreg Kroah-Hartman return quot; 427ab4382d2SGreg Kroah-Hartman } 428ab4382d2SGreg Kroah-Hartman 429ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_get_divisor); 430ab4382d2SGreg Kroah-Hartman 431ab4382d2SGreg Kroah-Hartman /* FIXME: Consistent locking policy */ 432ab4382d2SGreg Kroah-Hartman static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, 433ab4382d2SGreg Kroah-Hartman struct ktermios *old_termios) 434ab4382d2SGreg Kroah-Hartman { 435ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 436ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 437ab4382d2SGreg Kroah-Hartman struct ktermios *termios; 438ab4382d2SGreg Kroah-Hartman 439ab4382d2SGreg Kroah-Hartman /* 440ab4382d2SGreg Kroah-Hartman * If we have no tty, termios, or the port does not exist, 441ab4382d2SGreg Kroah-Hartman * then we can't set the parameters for this port. 442ab4382d2SGreg Kroah-Hartman */ 443adc8d746SAlan Cox if (!tty || uport->type == PORT_UNKNOWN) 444ab4382d2SGreg Kroah-Hartman return; 445ab4382d2SGreg Kroah-Hartman 446adc8d746SAlan Cox termios = &tty->termios; 447ab4382d2SGreg Kroah-Hartman 448ab4382d2SGreg Kroah-Hartman /* 449ab4382d2SGreg Kroah-Hartman * Set flags based on termios cflag 450ab4382d2SGreg Kroah-Hartman */ 451ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CRTSCTS) 452ab4382d2SGreg Kroah-Hartman set_bit(ASYNCB_CTS_FLOW, &port->flags); 453ab4382d2SGreg Kroah-Hartman else 454ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_CTS_FLOW, &port->flags); 455ab4382d2SGreg Kroah-Hartman 456ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CLOCAL) 457ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_CHECK_CD, &port->flags); 458ab4382d2SGreg Kroah-Hartman else 459ab4382d2SGreg Kroah-Hartman set_bit(ASYNCB_CHECK_CD, &port->flags); 460ab4382d2SGreg Kroah-Hartman 461ab4382d2SGreg Kroah-Hartman uport->ops->set_termios(uport, termios, old_termios); 462ab4382d2SGreg Kroah-Hartman } 463ab4382d2SGreg Kroah-Hartman 464ab4382d2SGreg Kroah-Hartman static inline int __uart_put_char(struct uart_port *port, 465ab4382d2SGreg Kroah-Hartman struct circ_buf *circ, unsigned char c) 466ab4382d2SGreg Kroah-Hartman { 467ab4382d2SGreg Kroah-Hartman unsigned long flags; 468ab4382d2SGreg Kroah-Hartman int ret = 0; 469ab4382d2SGreg Kroah-Hartman 470ab4382d2SGreg Kroah-Hartman if (!circ->buf) 471ab4382d2SGreg Kroah-Hartman return 0; 472ab4382d2SGreg Kroah-Hartman 473ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 474ab4382d2SGreg Kroah-Hartman if (uart_circ_chars_free(circ) != 0) { 475ab4382d2SGreg Kroah-Hartman circ->buf[circ->head] = c; 476ab4382d2SGreg Kroah-Hartman circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1); 477ab4382d2SGreg Kroah-Hartman ret = 1; 478ab4382d2SGreg Kroah-Hartman } 479ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 480ab4382d2SGreg Kroah-Hartman return ret; 481ab4382d2SGreg Kroah-Hartman } 482ab4382d2SGreg Kroah-Hartman 483ab4382d2SGreg Kroah-Hartman static int uart_put_char(struct tty_struct *tty, unsigned char ch) 484ab4382d2SGreg Kroah-Hartman { 485ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 486ab4382d2SGreg Kroah-Hartman 487ab4382d2SGreg Kroah-Hartman return __uart_put_char(state->uart_port, &state->xmit, ch); 488ab4382d2SGreg Kroah-Hartman } 489ab4382d2SGreg Kroah-Hartman 490ab4382d2SGreg Kroah-Hartman static void uart_flush_chars(struct tty_struct *tty) 491ab4382d2SGreg Kroah-Hartman { 492ab4382d2SGreg Kroah-Hartman uart_start(tty); 493ab4382d2SGreg Kroah-Hartman } 494ab4382d2SGreg Kroah-Hartman 495ab4382d2SGreg Kroah-Hartman static int uart_write(struct tty_struct *tty, 496ab4382d2SGreg Kroah-Hartman const unsigned char *buf, int count) 497ab4382d2SGreg Kroah-Hartman { 498ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 499ab4382d2SGreg Kroah-Hartman struct uart_port *port; 500ab4382d2SGreg Kroah-Hartman struct circ_buf *circ; 501ab4382d2SGreg Kroah-Hartman unsigned long flags; 502ab4382d2SGreg Kroah-Hartman int c, ret = 0; 503ab4382d2SGreg Kroah-Hartman 504ab4382d2SGreg Kroah-Hartman /* 505ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 506ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 507ab4382d2SGreg Kroah-Hartman */ 508ab4382d2SGreg Kroah-Hartman if (!state) { 509ab4382d2SGreg Kroah-Hartman WARN_ON(1); 510ab4382d2SGreg Kroah-Hartman return -EL3HLT; 511ab4382d2SGreg Kroah-Hartman } 512ab4382d2SGreg Kroah-Hartman 513ab4382d2SGreg Kroah-Hartman port = state->uart_port; 514ab4382d2SGreg Kroah-Hartman circ = &state->xmit; 515ab4382d2SGreg Kroah-Hartman 516ab4382d2SGreg Kroah-Hartman if (!circ->buf) 517ab4382d2SGreg Kroah-Hartman return 0; 518ab4382d2SGreg Kroah-Hartman 519ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 520ab4382d2SGreg Kroah-Hartman while (1) { 521ab4382d2SGreg Kroah-Hartman c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE); 522ab4382d2SGreg Kroah-Hartman if (count < c) 523ab4382d2SGreg Kroah-Hartman c = count; 524ab4382d2SGreg Kroah-Hartman if (c <= 0) 525ab4382d2SGreg Kroah-Hartman break; 526ab4382d2SGreg Kroah-Hartman memcpy(circ->buf + circ->head, buf, c); 527ab4382d2SGreg Kroah-Hartman circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1); 528ab4382d2SGreg Kroah-Hartman buf += c; 529ab4382d2SGreg Kroah-Hartman count -= c; 530ab4382d2SGreg Kroah-Hartman ret += c; 531ab4382d2SGreg Kroah-Hartman } 532ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 533ab4382d2SGreg Kroah-Hartman 534ab4382d2SGreg Kroah-Hartman uart_start(tty); 535ab4382d2SGreg Kroah-Hartman return ret; 536ab4382d2SGreg Kroah-Hartman } 537ab4382d2SGreg Kroah-Hartman 538ab4382d2SGreg Kroah-Hartman static int uart_write_room(struct tty_struct *tty) 539ab4382d2SGreg Kroah-Hartman { 540ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 541ab4382d2SGreg Kroah-Hartman unsigned long flags; 542ab4382d2SGreg Kroah-Hartman int ret; 543ab4382d2SGreg Kroah-Hartman 544ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&state->uart_port->lock, flags); 545ab4382d2SGreg Kroah-Hartman ret = uart_circ_chars_free(&state->xmit); 546ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&state->uart_port->lock, flags); 547ab4382d2SGreg Kroah-Hartman return ret; 548ab4382d2SGreg Kroah-Hartman } 549ab4382d2SGreg Kroah-Hartman 550ab4382d2SGreg Kroah-Hartman static int uart_chars_in_buffer(struct tty_struct *tty) 551ab4382d2SGreg Kroah-Hartman { 552ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 553ab4382d2SGreg Kroah-Hartman unsigned long flags; 554ab4382d2SGreg Kroah-Hartman int ret; 555ab4382d2SGreg Kroah-Hartman 556ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&state->uart_port->lock, flags); 557ab4382d2SGreg Kroah-Hartman ret = uart_circ_chars_pending(&state->xmit); 558ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&state->uart_port->lock, flags); 559ab4382d2SGreg Kroah-Hartman return ret; 560ab4382d2SGreg Kroah-Hartman } 561ab4382d2SGreg Kroah-Hartman 562ab4382d2SGreg Kroah-Hartman static void uart_flush_buffer(struct tty_struct *tty) 563ab4382d2SGreg Kroah-Hartman { 564ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 565ab4382d2SGreg Kroah-Hartman struct uart_port *port; 566ab4382d2SGreg Kroah-Hartman unsigned long flags; 567ab4382d2SGreg Kroah-Hartman 568ab4382d2SGreg Kroah-Hartman /* 569ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 570ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 571ab4382d2SGreg Kroah-Hartman */ 572ab4382d2SGreg Kroah-Hartman if (!state) { 573ab4382d2SGreg Kroah-Hartman WARN_ON(1); 574ab4382d2SGreg Kroah-Hartman return; 575ab4382d2SGreg Kroah-Hartman } 576ab4382d2SGreg Kroah-Hartman 577ab4382d2SGreg Kroah-Hartman port = state->uart_port; 578ab4382d2SGreg Kroah-Hartman pr_debug("uart_flush_buffer(%d) called\n", tty->index); 579ab4382d2SGreg Kroah-Hartman 580ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 581ab4382d2SGreg Kroah-Hartman uart_circ_clear(&state->xmit); 582ab4382d2SGreg Kroah-Hartman if (port->ops->flush_buffer) 583ab4382d2SGreg Kroah-Hartman port->ops->flush_buffer(port); 584ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 585ab4382d2SGreg Kroah-Hartman tty_wakeup(tty); 586ab4382d2SGreg Kroah-Hartman } 587ab4382d2SGreg Kroah-Hartman 588ab4382d2SGreg Kroah-Hartman /* 589ab4382d2SGreg Kroah-Hartman * This function is used to send a high-priority XON/XOFF character to 590ab4382d2SGreg Kroah-Hartman * the device 591ab4382d2SGreg Kroah-Hartman */ 592ab4382d2SGreg Kroah-Hartman static void uart_send_xchar(struct tty_struct *tty, char ch) 593ab4382d2SGreg Kroah-Hartman { 594ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 595ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 596ab4382d2SGreg Kroah-Hartman unsigned long flags; 597ab4382d2SGreg Kroah-Hartman 598ab4382d2SGreg Kroah-Hartman if (port->ops->send_xchar) 599ab4382d2SGreg Kroah-Hartman port->ops->send_xchar(port, ch); 600ab4382d2SGreg Kroah-Hartman else { 601ab4382d2SGreg Kroah-Hartman port->x_char = ch; 602ab4382d2SGreg Kroah-Hartman if (ch) { 603ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 604ab4382d2SGreg Kroah-Hartman port->ops->start_tx(port); 605ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 606ab4382d2SGreg Kroah-Hartman } 607ab4382d2SGreg Kroah-Hartman } 608ab4382d2SGreg Kroah-Hartman } 609ab4382d2SGreg Kroah-Hartman 610ab4382d2SGreg Kroah-Hartman static void uart_throttle(struct tty_struct *tty) 611ab4382d2SGreg Kroah-Hartman { 612ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 613ab4382d2SGreg Kroah-Hartman 614ab4382d2SGreg Kroah-Hartman if (I_IXOFF(tty)) 615ab4382d2SGreg Kroah-Hartman uart_send_xchar(tty, STOP_CHAR(tty)); 616ab4382d2SGreg Kroah-Hartman 617adc8d746SAlan Cox if (tty->termios.c_cflag & CRTSCTS) 618ab4382d2SGreg Kroah-Hartman uart_clear_mctrl(state->uart_port, TIOCM_RTS); 619ab4382d2SGreg Kroah-Hartman } 620ab4382d2SGreg Kroah-Hartman 621ab4382d2SGreg Kroah-Hartman static void uart_unthrottle(struct tty_struct *tty) 622ab4382d2SGreg Kroah-Hartman { 623ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 624ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 625ab4382d2SGreg Kroah-Hartman 626ab4382d2SGreg Kroah-Hartman if (I_IXOFF(tty)) { 627ab4382d2SGreg Kroah-Hartman if (port->x_char) 628ab4382d2SGreg Kroah-Hartman port->x_char = 0; 629ab4382d2SGreg Kroah-Hartman else 630ab4382d2SGreg Kroah-Hartman uart_send_xchar(tty, START_CHAR(tty)); 631ab4382d2SGreg Kroah-Hartman } 632ab4382d2SGreg Kroah-Hartman 633adc8d746SAlan Cox if (tty->termios.c_cflag & CRTSCTS) 634ab4382d2SGreg Kroah-Hartman uart_set_mctrl(port, TIOCM_RTS); 635ab4382d2SGreg Kroah-Hartman } 636ab4382d2SGreg Kroah-Hartman 6377ba2e769SAlan Cox static void uart_get_info(struct tty_port *port, 6387ba2e769SAlan Cox struct uart_state *state, 6397ba2e769SAlan Cox struct serial_struct *retinfo) 640ab4382d2SGreg Kroah-Hartman { 641ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 6427ba2e769SAlan Cox 64337cd0c99SFengguang Wu memset(retinfo, 0, sizeof(*retinfo)); 6447ba2e769SAlan Cox 6457ba2e769SAlan Cox retinfo->type = uport->type; 6467ba2e769SAlan Cox retinfo->line = uport->line; 6477ba2e769SAlan Cox retinfo->port = uport->iobase; 6487ba2e769SAlan Cox if (HIGH_BITS_OFFSET) 6497ba2e769SAlan Cox retinfo->port_high = (long) uport->iobase >> HIGH_BITS_OFFSET; 6507ba2e769SAlan Cox retinfo->irq = uport->irq; 6517ba2e769SAlan Cox retinfo->flags = uport->flags; 6527ba2e769SAlan Cox retinfo->xmit_fifo_size = uport->fifosize; 6537ba2e769SAlan Cox retinfo->baud_base = uport->uartclk / 16; 6547ba2e769SAlan Cox retinfo->close_delay = jiffies_to_msecs(port->close_delay) / 10; 6557ba2e769SAlan Cox retinfo->closing_wait = port->closing_wait == ASYNC_CLOSING_WAIT_NONE ? 6567ba2e769SAlan Cox ASYNC_CLOSING_WAIT_NONE : 6577ba2e769SAlan Cox jiffies_to_msecs(port->closing_wait) / 10; 6587ba2e769SAlan Cox retinfo->custom_divisor = uport->custom_divisor; 6597ba2e769SAlan Cox retinfo->hub6 = uport->hub6; 6607ba2e769SAlan Cox retinfo->io_type = uport->iotype; 6617ba2e769SAlan Cox retinfo->iomem_reg_shift = uport->regshift; 6627ba2e769SAlan Cox retinfo->iomem_base = (void *)(unsigned long)uport->mapbase; 6637ba2e769SAlan Cox } 6647ba2e769SAlan Cox 6657ba2e769SAlan Cox static int uart_get_info_user(struct uart_state *state, 6667ba2e769SAlan Cox struct serial_struct __user *retinfo) 6677ba2e769SAlan Cox { 668ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 669ab4382d2SGreg Kroah-Hartman struct serial_struct tmp; 670ab4382d2SGreg Kroah-Hartman 671ab4382d2SGreg Kroah-Hartman /* Ensure the state we copy is consistent and no hardware changes 672ab4382d2SGreg Kroah-Hartman occur as we go */ 673ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 6747ba2e769SAlan Cox uart_get_info(port, state, &tmp); 675ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 676ab4382d2SGreg Kroah-Hartman 677ab4382d2SGreg Kroah-Hartman if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) 678ab4382d2SGreg Kroah-Hartman return -EFAULT; 679ab4382d2SGreg Kroah-Hartman return 0; 680ab4382d2SGreg Kroah-Hartman } 681ab4382d2SGreg Kroah-Hartman 6827ba2e769SAlan Cox static int uart_set_info(struct tty_struct *tty, struct tty_port *port, 6837ba2e769SAlan Cox struct uart_state *state, 6847ba2e769SAlan Cox struct serial_struct *new_info) 685ab4382d2SGreg Kroah-Hartman { 686ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 687ab4382d2SGreg Kroah-Hartman unsigned long new_port; 688ab4382d2SGreg Kroah-Hartman unsigned int change_irq, change_port, closing_wait; 689ab4382d2SGreg Kroah-Hartman unsigned int old_custom_divisor, close_delay; 690ab4382d2SGreg Kroah-Hartman upf_t old_flags, new_flags; 691ab4382d2SGreg Kroah-Hartman int retval = 0; 692ab4382d2SGreg Kroah-Hartman 6937ba2e769SAlan Cox new_port = new_info->port; 694ab4382d2SGreg Kroah-Hartman if (HIGH_BITS_OFFSET) 6957ba2e769SAlan Cox new_port += (unsigned long) new_info->port_high << HIGH_BITS_OFFSET; 696ab4382d2SGreg Kroah-Hartman 6977ba2e769SAlan Cox new_info->irq = irq_canonicalize(new_info->irq); 6987ba2e769SAlan Cox close_delay = msecs_to_jiffies(new_info->close_delay * 10); 6997ba2e769SAlan Cox closing_wait = new_info->closing_wait == ASYNC_CLOSING_WAIT_NONE ? 7004cb0fbfdSJiri Slaby ASYNC_CLOSING_WAIT_NONE : 7017ba2e769SAlan Cox msecs_to_jiffies(new_info->closing_wait * 10); 702ab4382d2SGreg Kroah-Hartman 703ab4382d2SGreg Kroah-Hartman 704ab4382d2SGreg Kroah-Hartman change_irq = !(uport->flags & UPF_FIXED_PORT) 7057ba2e769SAlan Cox && new_info->irq != uport->irq; 706ab4382d2SGreg Kroah-Hartman 707ab4382d2SGreg Kroah-Hartman /* 708ab4382d2SGreg Kroah-Hartman * Since changing the 'type' of the port changes its resource 709ab4382d2SGreg Kroah-Hartman * allocations, we should treat type changes the same as 710ab4382d2SGreg Kroah-Hartman * IO port changes. 711ab4382d2SGreg Kroah-Hartman */ 712ab4382d2SGreg Kroah-Hartman change_port = !(uport->flags & UPF_FIXED_PORT) 713ab4382d2SGreg Kroah-Hartman && (new_port != uport->iobase || 7147ba2e769SAlan Cox (unsigned long)new_info->iomem_base != uport->mapbase || 7157ba2e769SAlan Cox new_info->hub6 != uport->hub6 || 7167ba2e769SAlan Cox new_info->io_type != uport->iotype || 7177ba2e769SAlan Cox new_info->iomem_reg_shift != uport->regshift || 7187ba2e769SAlan Cox new_info->type != uport->type); 719ab4382d2SGreg Kroah-Hartman 720ab4382d2SGreg Kroah-Hartman old_flags = uport->flags; 7217ba2e769SAlan Cox new_flags = new_info->flags; 722ab4382d2SGreg Kroah-Hartman old_custom_divisor = uport->custom_divisor; 723ab4382d2SGreg Kroah-Hartman 724ab4382d2SGreg Kroah-Hartman if (!capable(CAP_SYS_ADMIN)) { 725ab4382d2SGreg Kroah-Hartman retval = -EPERM; 726ab4382d2SGreg Kroah-Hartman if (change_irq || change_port || 7277ba2e769SAlan Cox (new_info->baud_base != uport->uartclk / 16) || 728ab4382d2SGreg Kroah-Hartman (close_delay != port->close_delay) || 729ab4382d2SGreg Kroah-Hartman (closing_wait != port->closing_wait) || 7307ba2e769SAlan Cox (new_info->xmit_fifo_size && 7317ba2e769SAlan Cox new_info->xmit_fifo_size != uport->fifosize) || 732ab4382d2SGreg Kroah-Hartman (((new_flags ^ old_flags) & ~UPF_USR_MASK) != 0)) 733ab4382d2SGreg Kroah-Hartman goto exit; 734ab4382d2SGreg Kroah-Hartman uport->flags = ((uport->flags & ~UPF_USR_MASK) | 735ab4382d2SGreg Kroah-Hartman (new_flags & UPF_USR_MASK)); 7367ba2e769SAlan Cox uport->custom_divisor = new_info->custom_divisor; 737ab4382d2SGreg Kroah-Hartman goto check_and_exit; 738ab4382d2SGreg Kroah-Hartman } 739ab4382d2SGreg Kroah-Hartman 740ab4382d2SGreg Kroah-Hartman /* 741ab4382d2SGreg Kroah-Hartman * Ask the low level driver to verify the settings. 742ab4382d2SGreg Kroah-Hartman */ 743ab4382d2SGreg Kroah-Hartman if (uport->ops->verify_port) 7447ba2e769SAlan Cox retval = uport->ops->verify_port(uport, new_info); 745ab4382d2SGreg Kroah-Hartman 7467ba2e769SAlan Cox if ((new_info->irq >= nr_irqs) || (new_info->irq < 0) || 7477ba2e769SAlan Cox (new_info->baud_base < 9600)) 748ab4382d2SGreg Kroah-Hartman retval = -EINVAL; 749ab4382d2SGreg Kroah-Hartman 750ab4382d2SGreg Kroah-Hartman if (retval) 751ab4382d2SGreg Kroah-Hartman goto exit; 752ab4382d2SGreg Kroah-Hartman 753ab4382d2SGreg Kroah-Hartman if (change_port || change_irq) { 754ab4382d2SGreg Kroah-Hartman retval = -EBUSY; 755ab4382d2SGreg Kroah-Hartman 756ab4382d2SGreg Kroah-Hartman /* 757ab4382d2SGreg Kroah-Hartman * Make sure that we are the sole user of this port. 758ab4382d2SGreg Kroah-Hartman */ 759ab4382d2SGreg Kroah-Hartman if (tty_port_users(port) > 1) 760ab4382d2SGreg Kroah-Hartman goto exit; 761ab4382d2SGreg Kroah-Hartman 762ab4382d2SGreg Kroah-Hartman /* 763ab4382d2SGreg Kroah-Hartman * We need to shutdown the serial port at the old 764ab4382d2SGreg Kroah-Hartman * port/type/irq combination. 765ab4382d2SGreg Kroah-Hartman */ 766ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 767ab4382d2SGreg Kroah-Hartman } 768ab4382d2SGreg Kroah-Hartman 769ab4382d2SGreg Kroah-Hartman if (change_port) { 770ab4382d2SGreg Kroah-Hartman unsigned long old_iobase, old_mapbase; 771ab4382d2SGreg Kroah-Hartman unsigned int old_type, old_iotype, old_hub6, old_shift; 772ab4382d2SGreg Kroah-Hartman 773ab4382d2SGreg Kroah-Hartman old_iobase = uport->iobase; 774ab4382d2SGreg Kroah-Hartman old_mapbase = uport->mapbase; 775ab4382d2SGreg Kroah-Hartman old_type = uport->type; 776ab4382d2SGreg Kroah-Hartman old_hub6 = uport->hub6; 777ab4382d2SGreg Kroah-Hartman old_iotype = uport->iotype; 778ab4382d2SGreg Kroah-Hartman old_shift = uport->regshift; 779ab4382d2SGreg Kroah-Hartman 780ab4382d2SGreg Kroah-Hartman /* 781ab4382d2SGreg Kroah-Hartman * Free and release old regions 782ab4382d2SGreg Kroah-Hartman */ 783ab4382d2SGreg Kroah-Hartman if (old_type != PORT_UNKNOWN) 784ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 785ab4382d2SGreg Kroah-Hartman 786ab4382d2SGreg Kroah-Hartman uport->iobase = new_port; 7877ba2e769SAlan Cox uport->type = new_info->type; 7887ba2e769SAlan Cox uport->hub6 = new_info->hub6; 7897ba2e769SAlan Cox uport->iotype = new_info->io_type; 7907ba2e769SAlan Cox uport->regshift = new_info->iomem_reg_shift; 7917ba2e769SAlan Cox uport->mapbase = (unsigned long)new_info->iomem_base; 792ab4382d2SGreg Kroah-Hartman 793ab4382d2SGreg Kroah-Hartman /* 794ab4382d2SGreg Kroah-Hartman * Claim and map the new regions 795ab4382d2SGreg Kroah-Hartman */ 796ab4382d2SGreg Kroah-Hartman if (uport->type != PORT_UNKNOWN) { 797ab4382d2SGreg Kroah-Hartman retval = uport->ops->request_port(uport); 798ab4382d2SGreg Kroah-Hartman } else { 799ab4382d2SGreg Kroah-Hartman /* Always success - Jean II */ 800ab4382d2SGreg Kroah-Hartman retval = 0; 801ab4382d2SGreg Kroah-Hartman } 802ab4382d2SGreg Kroah-Hartman 803ab4382d2SGreg Kroah-Hartman /* 804ab4382d2SGreg Kroah-Hartman * If we fail to request resources for the 805ab4382d2SGreg Kroah-Hartman * new port, try to restore the old settings. 806ab4382d2SGreg Kroah-Hartman */ 807ab4382d2SGreg Kroah-Hartman if (retval && old_type != PORT_UNKNOWN) { 808ab4382d2SGreg Kroah-Hartman uport->iobase = old_iobase; 809ab4382d2SGreg Kroah-Hartman uport->type = old_type; 810ab4382d2SGreg Kroah-Hartman uport->hub6 = old_hub6; 811ab4382d2SGreg Kroah-Hartman uport->iotype = old_iotype; 812ab4382d2SGreg Kroah-Hartman uport->regshift = old_shift; 813ab4382d2SGreg Kroah-Hartman uport->mapbase = old_mapbase; 814ab4382d2SGreg Kroah-Hartman retval = uport->ops->request_port(uport); 815ab4382d2SGreg Kroah-Hartman /* 816ab4382d2SGreg Kroah-Hartman * If we failed to restore the old settings, 817ab4382d2SGreg Kroah-Hartman * we fail like this. 818ab4382d2SGreg Kroah-Hartman */ 819ab4382d2SGreg Kroah-Hartman if (retval) 820ab4382d2SGreg Kroah-Hartman uport->type = PORT_UNKNOWN; 821ab4382d2SGreg Kroah-Hartman 822ab4382d2SGreg Kroah-Hartman /* 823ab4382d2SGreg Kroah-Hartman * We failed anyway. 824ab4382d2SGreg Kroah-Hartman */ 825ab4382d2SGreg Kroah-Hartman retval = -EBUSY; 826ab4382d2SGreg Kroah-Hartman /* Added to return the correct error -Ram Gupta */ 827ab4382d2SGreg Kroah-Hartman goto exit; 828ab4382d2SGreg Kroah-Hartman } 829ab4382d2SGreg Kroah-Hartman } 830ab4382d2SGreg Kroah-Hartman 831ab4382d2SGreg Kroah-Hartman if (change_irq) 8327ba2e769SAlan Cox uport->irq = new_info->irq; 833ab4382d2SGreg Kroah-Hartman if (!(uport->flags & UPF_FIXED_PORT)) 8347ba2e769SAlan Cox uport->uartclk = new_info->baud_base * 16; 835ab4382d2SGreg Kroah-Hartman uport->flags = (uport->flags & ~UPF_CHANGE_MASK) | 836ab4382d2SGreg Kroah-Hartman (new_flags & UPF_CHANGE_MASK); 8377ba2e769SAlan Cox uport->custom_divisor = new_info->custom_divisor; 838ab4382d2SGreg Kroah-Hartman port->close_delay = close_delay; 839ab4382d2SGreg Kroah-Hartman port->closing_wait = closing_wait; 8407ba2e769SAlan Cox if (new_info->xmit_fifo_size) 8417ba2e769SAlan Cox uport->fifosize = new_info->xmit_fifo_size; 842ab4382d2SGreg Kroah-Hartman if (port->tty) 843ab4382d2SGreg Kroah-Hartman port->tty->low_latency = 844ab4382d2SGreg Kroah-Hartman (uport->flags & UPF_LOW_LATENCY) ? 1 : 0; 845ab4382d2SGreg Kroah-Hartman 846ab4382d2SGreg Kroah-Hartman check_and_exit: 847ab4382d2SGreg Kroah-Hartman retval = 0; 848ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) 849ab4382d2SGreg Kroah-Hartman goto exit; 850ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_INITIALIZED) { 851ab4382d2SGreg Kroah-Hartman if (((old_flags ^ uport->flags) & UPF_SPD_MASK) || 852ab4382d2SGreg Kroah-Hartman old_custom_divisor != uport->custom_divisor) { 853ab4382d2SGreg Kroah-Hartman /* 854ab4382d2SGreg Kroah-Hartman * If they're setting up a custom divisor or speed, 855ab4382d2SGreg Kroah-Hartman * instead of clearing it, then bitch about it. No 856ab4382d2SGreg Kroah-Hartman * need to rate-limit; it's CAP_SYS_ADMIN only. 857ab4382d2SGreg Kroah-Hartman */ 858ab4382d2SGreg Kroah-Hartman if (uport->flags & UPF_SPD_MASK) { 859ab4382d2SGreg Kroah-Hartman char buf[64]; 860ab4382d2SGreg Kroah-Hartman printk(KERN_NOTICE 861ab4382d2SGreg Kroah-Hartman "%s sets custom speed on %s. This " 862ab4382d2SGreg Kroah-Hartman "is deprecated.\n", current->comm, 863ab4382d2SGreg Kroah-Hartman tty_name(port->tty, buf)); 864ab4382d2SGreg Kroah-Hartman } 865ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 866ab4382d2SGreg Kroah-Hartman } 867ab4382d2SGreg Kroah-Hartman } else 868ab4382d2SGreg Kroah-Hartman retval = uart_startup(tty, state, 1); 869ab4382d2SGreg Kroah-Hartman exit: 8707ba2e769SAlan Cox return retval; 8717ba2e769SAlan Cox } 8727ba2e769SAlan Cox 8737ba2e769SAlan Cox static int uart_set_info_user(struct tty_struct *tty, struct uart_state *state, 8747ba2e769SAlan Cox struct serial_struct __user *newinfo) 8757ba2e769SAlan Cox { 8767ba2e769SAlan Cox struct serial_struct new_serial; 8777ba2e769SAlan Cox struct tty_port *port = &state->port; 8787ba2e769SAlan Cox int retval; 8797ba2e769SAlan Cox 8807ba2e769SAlan Cox if (copy_from_user(&new_serial, newinfo, sizeof(new_serial))) 8817ba2e769SAlan Cox return -EFAULT; 8827ba2e769SAlan Cox 8837ba2e769SAlan Cox /* 8847ba2e769SAlan Cox * This semaphore protects port->count. It is also 8857ba2e769SAlan Cox * very useful to prevent opens. Also, take the 8867ba2e769SAlan Cox * port configuration semaphore to make sure that a 8877ba2e769SAlan Cox * module insertion/removal doesn't change anything 8887ba2e769SAlan Cox * under us. 8897ba2e769SAlan Cox */ 8907ba2e769SAlan Cox mutex_lock(&port->mutex); 8917ba2e769SAlan Cox retval = uart_set_info(tty, port, state, &new_serial); 892ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 893ab4382d2SGreg Kroah-Hartman return retval; 894ab4382d2SGreg Kroah-Hartman } 895ab4382d2SGreg Kroah-Hartman 896ab4382d2SGreg Kroah-Hartman /** 897ab4382d2SGreg Kroah-Hartman * uart_get_lsr_info - get line status register info 898ab4382d2SGreg Kroah-Hartman * @tty: tty associated with the UART 899ab4382d2SGreg Kroah-Hartman * @state: UART being queried 900ab4382d2SGreg Kroah-Hartman * @value: returned modem value 901ab4382d2SGreg Kroah-Hartman * 902ab4382d2SGreg Kroah-Hartman * Note: uart_ioctl protects us against hangups. 903ab4382d2SGreg Kroah-Hartman */ 904ab4382d2SGreg Kroah-Hartman static int uart_get_lsr_info(struct tty_struct *tty, 905ab4382d2SGreg Kroah-Hartman struct uart_state *state, unsigned int __user *value) 906ab4382d2SGreg Kroah-Hartman { 907ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 908ab4382d2SGreg Kroah-Hartman unsigned int result; 909ab4382d2SGreg Kroah-Hartman 910ab4382d2SGreg Kroah-Hartman result = uport->ops->tx_empty(uport); 911ab4382d2SGreg Kroah-Hartman 912ab4382d2SGreg Kroah-Hartman /* 913ab4382d2SGreg Kroah-Hartman * If we're about to load something into the transmit 914ab4382d2SGreg Kroah-Hartman * register, we'll pretend the transmitter isn't empty to 915ab4382d2SGreg Kroah-Hartman * avoid a race condition (depending on when the transmit 916ab4382d2SGreg Kroah-Hartman * interrupt happens). 917ab4382d2SGreg Kroah-Hartman */ 918ab4382d2SGreg Kroah-Hartman if (uport->x_char || 919ab4382d2SGreg Kroah-Hartman ((uart_circ_chars_pending(&state->xmit) > 0) && 920ab4382d2SGreg Kroah-Hartman !tty->stopped && !tty->hw_stopped)) 921ab4382d2SGreg Kroah-Hartman result &= ~TIOCSER_TEMT; 922ab4382d2SGreg Kroah-Hartman 923ab4382d2SGreg Kroah-Hartman return put_user(result, value); 924ab4382d2SGreg Kroah-Hartman } 925ab4382d2SGreg Kroah-Hartman 92660b33c13SAlan Cox static int uart_tiocmget(struct tty_struct *tty) 927ab4382d2SGreg Kroah-Hartman { 928ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 929ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 930ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 931ab4382d2SGreg Kroah-Hartman int result = -EIO; 932ab4382d2SGreg Kroah-Hartman 933ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 93460b33c13SAlan Cox if (!(tty->flags & (1 << TTY_IO_ERROR))) { 935ab4382d2SGreg Kroah-Hartman result = uport->mctrl; 936ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 937ab4382d2SGreg Kroah-Hartman result |= uport->ops->get_mctrl(uport); 938ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 939ab4382d2SGreg Kroah-Hartman } 940ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 941ab4382d2SGreg Kroah-Hartman 942ab4382d2SGreg Kroah-Hartman return result; 943ab4382d2SGreg Kroah-Hartman } 944ab4382d2SGreg Kroah-Hartman 945ab4382d2SGreg Kroah-Hartman static int 94620b9d177SAlan Cox uart_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear) 947ab4382d2SGreg Kroah-Hartman { 948ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 949ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 950ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 951ab4382d2SGreg Kroah-Hartman int ret = -EIO; 952ab4382d2SGreg Kroah-Hartman 953ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 95420b9d177SAlan Cox if (!(tty->flags & (1 << TTY_IO_ERROR))) { 955ab4382d2SGreg Kroah-Hartman uart_update_mctrl(uport, set, clear); 956ab4382d2SGreg Kroah-Hartman ret = 0; 957ab4382d2SGreg Kroah-Hartman } 958ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 959ab4382d2SGreg Kroah-Hartman return ret; 960ab4382d2SGreg Kroah-Hartman } 961ab4382d2SGreg Kroah-Hartman 962ab4382d2SGreg Kroah-Hartman static int uart_break_ctl(struct tty_struct *tty, int break_state) 963ab4382d2SGreg Kroah-Hartman { 964ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 965ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 966ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 967ab4382d2SGreg Kroah-Hartman 968ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 969ab4382d2SGreg Kroah-Hartman 970ab4382d2SGreg Kroah-Hartman if (uport->type != PORT_UNKNOWN) 971ab4382d2SGreg Kroah-Hartman uport->ops->break_ctl(uport, break_state); 972ab4382d2SGreg Kroah-Hartman 973ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 974ab4382d2SGreg Kroah-Hartman return 0; 975ab4382d2SGreg Kroah-Hartman } 976ab4382d2SGreg Kroah-Hartman 977ab4382d2SGreg Kroah-Hartman static int uart_do_autoconfig(struct tty_struct *tty,struct uart_state *state) 978ab4382d2SGreg Kroah-Hartman { 979ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 980ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 981ab4382d2SGreg Kroah-Hartman int flags, ret; 982ab4382d2SGreg Kroah-Hartman 983ab4382d2SGreg Kroah-Hartman if (!capable(CAP_SYS_ADMIN)) 984ab4382d2SGreg Kroah-Hartman return -EPERM; 985ab4382d2SGreg Kroah-Hartman 986ab4382d2SGreg Kroah-Hartman /* 987ab4382d2SGreg Kroah-Hartman * Take the per-port semaphore. This prevents count from 988ab4382d2SGreg Kroah-Hartman * changing, and hence any extra opens of the port while 989ab4382d2SGreg Kroah-Hartman * we're auto-configuring. 990ab4382d2SGreg Kroah-Hartman */ 991ab4382d2SGreg Kroah-Hartman if (mutex_lock_interruptible(&port->mutex)) 992ab4382d2SGreg Kroah-Hartman return -ERESTARTSYS; 993ab4382d2SGreg Kroah-Hartman 994ab4382d2SGreg Kroah-Hartman ret = -EBUSY; 995ab4382d2SGreg Kroah-Hartman if (tty_port_users(port) == 1) { 996ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 997ab4382d2SGreg Kroah-Hartman 998ab4382d2SGreg Kroah-Hartman /* 999ab4382d2SGreg Kroah-Hartman * If we already have a port type configured, 1000ab4382d2SGreg Kroah-Hartman * we must release its resources. 1001ab4382d2SGreg Kroah-Hartman */ 1002ab4382d2SGreg Kroah-Hartman if (uport->type != PORT_UNKNOWN) 1003ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 1004ab4382d2SGreg Kroah-Hartman 1005ab4382d2SGreg Kroah-Hartman flags = UART_CONFIG_TYPE; 1006ab4382d2SGreg Kroah-Hartman if (uport->flags & UPF_AUTO_IRQ) 1007ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_IRQ; 1008ab4382d2SGreg Kroah-Hartman 1009ab4382d2SGreg Kroah-Hartman /* 1010ab4382d2SGreg Kroah-Hartman * This will claim the ports resources if 1011ab4382d2SGreg Kroah-Hartman * a port is found. 1012ab4382d2SGreg Kroah-Hartman */ 1013ab4382d2SGreg Kroah-Hartman uport->ops->config_port(uport, flags); 1014ab4382d2SGreg Kroah-Hartman 1015ab4382d2SGreg Kroah-Hartman ret = uart_startup(tty, state, 1); 1016ab4382d2SGreg Kroah-Hartman } 1017ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1018ab4382d2SGreg Kroah-Hartman return ret; 1019ab4382d2SGreg Kroah-Hartman } 1020ab4382d2SGreg Kroah-Hartman 1021ab4382d2SGreg Kroah-Hartman /* 1022ab4382d2SGreg Kroah-Hartman * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change 1023ab4382d2SGreg Kroah-Hartman * - mask passed in arg for lines of interest 1024ab4382d2SGreg Kroah-Hartman * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) 1025ab4382d2SGreg Kroah-Hartman * Caller should use TIOCGICOUNT to see which one it was 1026ab4382d2SGreg Kroah-Hartman * 1027ab4382d2SGreg Kroah-Hartman * FIXME: This wants extracting into a common all driver implementation 1028ab4382d2SGreg Kroah-Hartman * of TIOCMWAIT using tty_port. 1029ab4382d2SGreg Kroah-Hartman */ 1030ab4382d2SGreg Kroah-Hartman static int 1031ab4382d2SGreg Kroah-Hartman uart_wait_modem_status(struct uart_state *state, unsigned long arg) 1032ab4382d2SGreg Kroah-Hartman { 1033ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1034ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1035ab4382d2SGreg Kroah-Hartman DECLARE_WAITQUEUE(wait, current); 1036ab4382d2SGreg Kroah-Hartman struct uart_icount cprev, cnow; 1037ab4382d2SGreg Kroah-Hartman int ret; 1038ab4382d2SGreg Kroah-Hartman 1039ab4382d2SGreg Kroah-Hartman /* 1040ab4382d2SGreg Kroah-Hartman * note the counters on entry 1041ab4382d2SGreg Kroah-Hartman */ 1042ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1043ab4382d2SGreg Kroah-Hartman memcpy(&cprev, &uport->icount, sizeof(struct uart_icount)); 1044ab4382d2SGreg Kroah-Hartman 1045ab4382d2SGreg Kroah-Hartman /* 1046ab4382d2SGreg Kroah-Hartman * Force modem status interrupts on 1047ab4382d2SGreg Kroah-Hartman */ 1048ab4382d2SGreg Kroah-Hartman uport->ops->enable_ms(uport); 1049ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1050ab4382d2SGreg Kroah-Hartman 1051ab4382d2SGreg Kroah-Hartman add_wait_queue(&port->delta_msr_wait, &wait); 1052ab4382d2SGreg Kroah-Hartman for (;;) { 1053ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1054ab4382d2SGreg Kroah-Hartman memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); 1055ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1056ab4382d2SGreg Kroah-Hartman 1057ab4382d2SGreg Kroah-Hartman set_current_state(TASK_INTERRUPTIBLE); 1058ab4382d2SGreg Kroah-Hartman 1059ab4382d2SGreg Kroah-Hartman if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || 1060ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || 1061ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || 1062ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) { 1063ab4382d2SGreg Kroah-Hartman ret = 0; 1064ab4382d2SGreg Kroah-Hartman break; 1065ab4382d2SGreg Kroah-Hartman } 1066ab4382d2SGreg Kroah-Hartman 1067ab4382d2SGreg Kroah-Hartman schedule(); 1068ab4382d2SGreg Kroah-Hartman 1069ab4382d2SGreg Kroah-Hartman /* see if a signal did it */ 1070ab4382d2SGreg Kroah-Hartman if (signal_pending(current)) { 1071ab4382d2SGreg Kroah-Hartman ret = -ERESTARTSYS; 1072ab4382d2SGreg Kroah-Hartman break; 1073ab4382d2SGreg Kroah-Hartman } 1074ab4382d2SGreg Kroah-Hartman 1075ab4382d2SGreg Kroah-Hartman cprev = cnow; 1076ab4382d2SGreg Kroah-Hartman } 1077ab4382d2SGreg Kroah-Hartman 1078ab4382d2SGreg Kroah-Hartman current->state = TASK_RUNNING; 1079ab4382d2SGreg Kroah-Hartman remove_wait_queue(&port->delta_msr_wait, &wait); 1080ab4382d2SGreg Kroah-Hartman 1081ab4382d2SGreg Kroah-Hartman return ret; 1082ab4382d2SGreg Kroah-Hartman } 1083ab4382d2SGreg Kroah-Hartman 1084ab4382d2SGreg Kroah-Hartman /* 1085ab4382d2SGreg Kroah-Hartman * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) 1086ab4382d2SGreg Kroah-Hartman * Return: write counters to the user passed counter struct 1087ab4382d2SGreg Kroah-Hartman * NB: both 1->0 and 0->1 transitions are counted except for 1088ab4382d2SGreg Kroah-Hartman * RI where only 0->1 is counted. 1089ab4382d2SGreg Kroah-Hartman */ 1090ab4382d2SGreg Kroah-Hartman static int uart_get_icount(struct tty_struct *tty, 1091ab4382d2SGreg Kroah-Hartman struct serial_icounter_struct *icount) 1092ab4382d2SGreg Kroah-Hartman { 1093ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1094ab4382d2SGreg Kroah-Hartman struct uart_icount cnow; 1095ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1096ab4382d2SGreg Kroah-Hartman 1097ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1098ab4382d2SGreg Kroah-Hartman memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); 1099ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1100ab4382d2SGreg Kroah-Hartman 1101ab4382d2SGreg Kroah-Hartman icount->cts = cnow.cts; 1102ab4382d2SGreg Kroah-Hartman icount->dsr = cnow.dsr; 1103ab4382d2SGreg Kroah-Hartman icount->rng = cnow.rng; 1104ab4382d2SGreg Kroah-Hartman icount->dcd = cnow.dcd; 1105ab4382d2SGreg Kroah-Hartman icount->rx = cnow.rx; 1106ab4382d2SGreg Kroah-Hartman icount->tx = cnow.tx; 1107ab4382d2SGreg Kroah-Hartman icount->frame = cnow.frame; 1108ab4382d2SGreg Kroah-Hartman icount->overrun = cnow.overrun; 1109ab4382d2SGreg Kroah-Hartman icount->parity = cnow.parity; 1110ab4382d2SGreg Kroah-Hartman icount->brk = cnow.brk; 1111ab4382d2SGreg Kroah-Hartman icount->buf_overrun = cnow.buf_overrun; 1112ab4382d2SGreg Kroah-Hartman 1113ab4382d2SGreg Kroah-Hartman return 0; 1114ab4382d2SGreg Kroah-Hartman } 1115ab4382d2SGreg Kroah-Hartman 1116ab4382d2SGreg Kroah-Hartman /* 1117ab4382d2SGreg Kroah-Hartman * Called via sys_ioctl. We can use spin_lock_irq() here. 1118ab4382d2SGreg Kroah-Hartman */ 1119ab4382d2SGreg Kroah-Hartman static int 11206caa76b7SAlan Cox uart_ioctl(struct tty_struct *tty, unsigned int cmd, 1121ab4382d2SGreg Kroah-Hartman unsigned long arg) 1122ab4382d2SGreg Kroah-Hartman { 1123ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1124ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1125ab4382d2SGreg Kroah-Hartman void __user *uarg = (void __user *)arg; 1126ab4382d2SGreg Kroah-Hartman int ret = -ENOIOCTLCMD; 1127ab4382d2SGreg Kroah-Hartman 1128ab4382d2SGreg Kroah-Hartman 1129ab4382d2SGreg Kroah-Hartman /* 1130ab4382d2SGreg Kroah-Hartman * These ioctls don't rely on the hardware to be present. 1131ab4382d2SGreg Kroah-Hartman */ 1132ab4382d2SGreg Kroah-Hartman switch (cmd) { 1133ab4382d2SGreg Kroah-Hartman case TIOCGSERIAL: 11347ba2e769SAlan Cox ret = uart_get_info_user(state, uarg); 1135ab4382d2SGreg Kroah-Hartman break; 1136ab4382d2SGreg Kroah-Hartman 1137ab4382d2SGreg Kroah-Hartman case TIOCSSERIAL: 11387ba2e769SAlan Cox ret = uart_set_info_user(tty, state, uarg); 1139ab4382d2SGreg Kroah-Hartman break; 1140ab4382d2SGreg Kroah-Hartman 1141ab4382d2SGreg Kroah-Hartman case TIOCSERCONFIG: 1142ab4382d2SGreg Kroah-Hartman ret = uart_do_autoconfig(tty, state); 1143ab4382d2SGreg Kroah-Hartman break; 1144ab4382d2SGreg Kroah-Hartman 1145ab4382d2SGreg Kroah-Hartman case TIOCSERGWILD: /* obsolete */ 1146ab4382d2SGreg Kroah-Hartman case TIOCSERSWILD: /* obsolete */ 1147ab4382d2SGreg Kroah-Hartman ret = 0; 1148ab4382d2SGreg Kroah-Hartman break; 1149ab4382d2SGreg Kroah-Hartman } 1150ab4382d2SGreg Kroah-Hartman 1151ab4382d2SGreg Kroah-Hartman if (ret != -ENOIOCTLCMD) 1152ab4382d2SGreg Kroah-Hartman goto out; 1153ab4382d2SGreg Kroah-Hartman 1154ab4382d2SGreg Kroah-Hartman if (tty->flags & (1 << TTY_IO_ERROR)) { 1155ab4382d2SGreg Kroah-Hartman ret = -EIO; 1156ab4382d2SGreg Kroah-Hartman goto out; 1157ab4382d2SGreg Kroah-Hartman } 1158ab4382d2SGreg Kroah-Hartman 1159ab4382d2SGreg Kroah-Hartman /* 1160ab4382d2SGreg Kroah-Hartman * The following should only be used when hardware is present. 1161ab4382d2SGreg Kroah-Hartman */ 1162ab4382d2SGreg Kroah-Hartman switch (cmd) { 1163ab4382d2SGreg Kroah-Hartman case TIOCMIWAIT: 1164ab4382d2SGreg Kroah-Hartman ret = uart_wait_modem_status(state, arg); 1165ab4382d2SGreg Kroah-Hartman break; 1166ab4382d2SGreg Kroah-Hartman } 1167ab4382d2SGreg Kroah-Hartman 1168ab4382d2SGreg Kroah-Hartman if (ret != -ENOIOCTLCMD) 1169ab4382d2SGreg Kroah-Hartman goto out; 1170ab4382d2SGreg Kroah-Hartman 1171ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1172ab4382d2SGreg Kroah-Hartman 11736caa76b7SAlan Cox if (tty->flags & (1 << TTY_IO_ERROR)) { 1174ab4382d2SGreg Kroah-Hartman ret = -EIO; 1175ab4382d2SGreg Kroah-Hartman goto out_up; 1176ab4382d2SGreg Kroah-Hartman } 1177ab4382d2SGreg Kroah-Hartman 1178ab4382d2SGreg Kroah-Hartman /* 1179ab4382d2SGreg Kroah-Hartman * All these rely on hardware being present and need to be 1180ab4382d2SGreg Kroah-Hartman * protected against the tty being hung up. 1181ab4382d2SGreg Kroah-Hartman */ 1182ab4382d2SGreg Kroah-Hartman switch (cmd) { 1183ab4382d2SGreg Kroah-Hartman case TIOCSERGETLSR: /* Get line status register */ 1184ab4382d2SGreg Kroah-Hartman ret = uart_get_lsr_info(tty, state, uarg); 1185ab4382d2SGreg Kroah-Hartman break; 1186ab4382d2SGreg Kroah-Hartman 1187ab4382d2SGreg Kroah-Hartman default: { 1188ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1189ab4382d2SGreg Kroah-Hartman if (uport->ops->ioctl) 1190ab4382d2SGreg Kroah-Hartman ret = uport->ops->ioctl(uport, cmd, arg); 1191ab4382d2SGreg Kroah-Hartman break; 1192ab4382d2SGreg Kroah-Hartman } 1193ab4382d2SGreg Kroah-Hartman } 1194ab4382d2SGreg Kroah-Hartman out_up: 1195ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1196ab4382d2SGreg Kroah-Hartman out: 1197ab4382d2SGreg Kroah-Hartman return ret; 1198ab4382d2SGreg Kroah-Hartman } 1199ab4382d2SGreg Kroah-Hartman 1200ab4382d2SGreg Kroah-Hartman static void uart_set_ldisc(struct tty_struct *tty) 1201ab4382d2SGreg Kroah-Hartman { 1202ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1203ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1204ab4382d2SGreg Kroah-Hartman 1205ab4382d2SGreg Kroah-Hartman if (uport->ops->set_ldisc) 1206adc8d746SAlan Cox uport->ops->set_ldisc(uport, tty->termios.c_line); 1207ab4382d2SGreg Kroah-Hartman } 1208ab4382d2SGreg Kroah-Hartman 1209ab4382d2SGreg Kroah-Hartman static void uart_set_termios(struct tty_struct *tty, 1210ab4382d2SGreg Kroah-Hartman struct ktermios *old_termios) 1211ab4382d2SGreg Kroah-Hartman { 1212ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1213ab4382d2SGreg Kroah-Hartman unsigned long flags; 1214adc8d746SAlan Cox unsigned int cflag = tty->termios.c_cflag; 1215ab4382d2SGreg Kroah-Hartman 1216ab4382d2SGreg Kroah-Hartman 1217ab4382d2SGreg Kroah-Hartman /* 1218ab4382d2SGreg Kroah-Hartman * These are the bits that are used to setup various 1219ab4382d2SGreg Kroah-Hartman * flags in the low level driver. We can ignore the Bfoo 1220ab4382d2SGreg Kroah-Hartman * bits in c_cflag; c_[io]speed will always be set 1221ab4382d2SGreg Kroah-Hartman * appropriately by set_termios() in tty_ioctl.c 1222ab4382d2SGreg Kroah-Hartman */ 1223ab4382d2SGreg Kroah-Hartman #define RELEVANT_IFLAG(iflag) ((iflag) & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK)) 1224ab4382d2SGreg Kroah-Hartman if ((cflag ^ old_termios->c_cflag) == 0 && 1225adc8d746SAlan Cox tty->termios.c_ospeed == old_termios->c_ospeed && 1226adc8d746SAlan Cox tty->termios.c_ispeed == old_termios->c_ispeed && 1227adc8d746SAlan Cox RELEVANT_IFLAG(tty->termios.c_iflag ^ old_termios->c_iflag) == 0) { 1228ab4382d2SGreg Kroah-Hartman return; 1229ab4382d2SGreg Kroah-Hartman } 1230ab4382d2SGreg Kroah-Hartman 1231ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, old_termios); 1232ab4382d2SGreg Kroah-Hartman 1233ab4382d2SGreg Kroah-Hartman /* Handle transition to B0 status */ 1234ab4382d2SGreg Kroah-Hartman if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) 1235ab4382d2SGreg Kroah-Hartman uart_clear_mctrl(state->uart_port, TIOCM_RTS | TIOCM_DTR); 1236ab4382d2SGreg Kroah-Hartman /* Handle transition away from B0 status */ 1237ab4382d2SGreg Kroah-Hartman else if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { 1238ab4382d2SGreg Kroah-Hartman unsigned int mask = TIOCM_DTR; 1239ab4382d2SGreg Kroah-Hartman if (!(cflag & CRTSCTS) || 1240ab4382d2SGreg Kroah-Hartman !test_bit(TTY_THROTTLED, &tty->flags)) 1241ab4382d2SGreg Kroah-Hartman mask |= TIOCM_RTS; 1242ab4382d2SGreg Kroah-Hartman uart_set_mctrl(state->uart_port, mask); 1243ab4382d2SGreg Kroah-Hartman } 1244ab4382d2SGreg Kroah-Hartman 1245ab4382d2SGreg Kroah-Hartman /* Handle turning off CRTSCTS */ 1246ab4382d2SGreg Kroah-Hartman if ((old_termios->c_cflag & CRTSCTS) && !(cflag & CRTSCTS)) { 1247ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&state->uart_port->lock, flags); 1248ab4382d2SGreg Kroah-Hartman tty->hw_stopped = 0; 1249ab4382d2SGreg Kroah-Hartman __uart_start(tty); 1250ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&state->uart_port->lock, flags); 1251ab4382d2SGreg Kroah-Hartman } 1252ab4382d2SGreg Kroah-Hartman /* Handle turning on CRTSCTS */ 1253ab4382d2SGreg Kroah-Hartman else if (!(old_termios->c_cflag & CRTSCTS) && (cflag & CRTSCTS)) { 1254ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&state->uart_port->lock, flags); 1255ab4382d2SGreg Kroah-Hartman if (!(state->uart_port->ops->get_mctrl(state->uart_port) & TIOCM_CTS)) { 1256ab4382d2SGreg Kroah-Hartman tty->hw_stopped = 1; 1257ab4382d2SGreg Kroah-Hartman state->uart_port->ops->stop_tx(state->uart_port); 1258ab4382d2SGreg Kroah-Hartman } 1259ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&state->uart_port->lock, flags); 1260ab4382d2SGreg Kroah-Hartman } 1261ab4382d2SGreg Kroah-Hartman } 1262ab4382d2SGreg Kroah-Hartman 1263ab4382d2SGreg Kroah-Hartman /* 1264ab4382d2SGreg Kroah-Hartman * In 2.4.5, calls to this will be serialized via the BKL in 1265ab4382d2SGreg Kroah-Hartman * linux/drivers/char/tty_io.c:tty_release() 1266ab4382d2SGreg Kroah-Hartman * linux/drivers/char/tty_io.c:do_tty_handup() 1267ab4382d2SGreg Kroah-Hartman */ 1268ab4382d2SGreg Kroah-Hartman static void uart_close(struct tty_struct *tty, struct file *filp) 1269ab4382d2SGreg Kroah-Hartman { 1270ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1271ab4382d2SGreg Kroah-Hartman struct tty_port *port; 1272ab4382d2SGreg Kroah-Hartman struct uart_port *uport; 1273ab4382d2SGreg Kroah-Hartman unsigned long flags; 1274ab4382d2SGreg Kroah-Hartman 1275ab4382d2SGreg Kroah-Hartman if (!state) 1276ab4382d2SGreg Kroah-Hartman return; 1277ab4382d2SGreg Kroah-Hartman 1278ab4382d2SGreg Kroah-Hartman uport = state->uart_port; 1279ab4382d2SGreg Kroah-Hartman port = &state->port; 1280ab4382d2SGreg Kroah-Hartman 1281ab4382d2SGreg Kroah-Hartman pr_debug("uart_close(%d) called\n", uport->line); 1282ab4382d2SGreg Kroah-Hartman 1283d30ccf08SJiri Slaby if (tty_port_close_start(port, tty, filp) == 0) 128455956216SNobuhiro Iwamatsu return; 1285ab4382d2SGreg Kroah-Hartman 1286ab4382d2SGreg Kroah-Hartman /* 1287ab4382d2SGreg Kroah-Hartman * At this point, we stop accepting input. To do this, we 1288ab4382d2SGreg Kroah-Hartman * disable the receive line status interrupts. 1289ab4382d2SGreg Kroah-Hartman */ 1290ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_INITIALIZED) { 1291ab4382d2SGreg Kroah-Hartman unsigned long flags; 1292ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&uport->lock, flags); 1293ab4382d2SGreg Kroah-Hartman uport->ops->stop_rx(uport); 1294ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&uport->lock, flags); 1295ab4382d2SGreg Kroah-Hartman /* 1296ab4382d2SGreg Kroah-Hartman * Before we drop DTR, make sure the UART transmitter 1297ab4382d2SGreg Kroah-Hartman * has completely drained; this is especially 1298ab4382d2SGreg Kroah-Hartman * important if there is a transmit FIFO! 1299ab4382d2SGreg Kroah-Hartman */ 13001f33a51dSJiri Slaby uart_wait_until_sent(tty, uport->timeout); 1301ab4382d2SGreg Kroah-Hartman } 1302ab4382d2SGreg Kroah-Hartman 1303bafb0bd2SJiri Slaby mutex_lock(&port->mutex); 1304ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 1305ab4382d2SGreg Kroah-Hartman uart_flush_buffer(tty); 1306ab4382d2SGreg Kroah-Hartman 1307ab4382d2SGreg Kroah-Hartman tty_ldisc_flush(tty); 1308ab4382d2SGreg Kroah-Hartman 1309ab4382d2SGreg Kroah-Hartman tty_port_tty_set(port, NULL); 1310ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 1311ab4382d2SGreg Kroah-Hartman tty->closing = 0; 1312ab4382d2SGreg Kroah-Hartman 1313ab4382d2SGreg Kroah-Hartman if (port->blocked_open) { 1314ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 1315ab4382d2SGreg Kroah-Hartman if (port->close_delay) 13164cb0fbfdSJiri Slaby msleep_interruptible( 13174cb0fbfdSJiri Slaby jiffies_to_msecs(port->close_delay)); 1318ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 1319ab4382d2SGreg Kroah-Hartman } else if (!uart_console(uport)) { 1320ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 1321ab4382d2SGreg Kroah-Hartman uart_change_pm(state, 3); 1322ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 1323ab4382d2SGreg Kroah-Hartman } 1324ab4382d2SGreg Kroah-Hartman 1325ab4382d2SGreg Kroah-Hartman /* 1326ab4382d2SGreg Kroah-Hartman * Wake up anyone trying to open this port. 1327ab4382d2SGreg Kroah-Hartman */ 1328ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); 1329426929f8SJiri Slaby clear_bit(ASYNCB_CLOSING, &port->flags); 1330ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 1331ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->open_wait); 1332426929f8SJiri Slaby wake_up_interruptible(&port->close_wait); 1333ab4382d2SGreg Kroah-Hartman 1334ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1335ab4382d2SGreg Kroah-Hartman } 1336ab4382d2SGreg Kroah-Hartman 13371f33a51dSJiri Slaby static void uart_wait_until_sent(struct tty_struct *tty, int timeout) 1338ab4382d2SGreg Kroah-Hartman { 13391f33a51dSJiri Slaby struct uart_state *state = tty->driver_data; 13401f33a51dSJiri Slaby struct uart_port *port = state->uart_port; 1341ab4382d2SGreg Kroah-Hartman unsigned long char_time, expire; 1342ab4382d2SGreg Kroah-Hartman 1343ab4382d2SGreg Kroah-Hartman if (port->type == PORT_UNKNOWN || port->fifosize == 0) 1344ab4382d2SGreg Kroah-Hartman return; 1345ab4382d2SGreg Kroah-Hartman 1346ab4382d2SGreg Kroah-Hartman /* 1347ab4382d2SGreg Kroah-Hartman * Set the check interval to be 1/5 of the estimated time to 1348ab4382d2SGreg Kroah-Hartman * send a single character, and make it at least 1. The check 1349ab4382d2SGreg Kroah-Hartman * interval should also be less than the timeout. 1350ab4382d2SGreg Kroah-Hartman * 1351ab4382d2SGreg Kroah-Hartman * Note: we have to use pretty tight timings here to satisfy 1352ab4382d2SGreg Kroah-Hartman * the NIST-PCTS. 1353ab4382d2SGreg Kroah-Hartman */ 1354ab4382d2SGreg Kroah-Hartman char_time = (port->timeout - HZ/50) / port->fifosize; 1355ab4382d2SGreg Kroah-Hartman char_time = char_time / 5; 1356ab4382d2SGreg Kroah-Hartman if (char_time == 0) 1357ab4382d2SGreg Kroah-Hartman char_time = 1; 1358ab4382d2SGreg Kroah-Hartman if (timeout && timeout < char_time) 1359ab4382d2SGreg Kroah-Hartman char_time = timeout; 1360ab4382d2SGreg Kroah-Hartman 1361ab4382d2SGreg Kroah-Hartman /* 1362ab4382d2SGreg Kroah-Hartman * If the transmitter hasn't cleared in twice the approximate 1363ab4382d2SGreg Kroah-Hartman * amount of time to send the entire FIFO, it probably won't 1364ab4382d2SGreg Kroah-Hartman * ever clear. This assumes the UART isn't doing flow 1365ab4382d2SGreg Kroah-Hartman * control, which is currently the case. Hence, if it ever 1366ab4382d2SGreg Kroah-Hartman * takes longer than port->timeout, this is probably due to a 1367ab4382d2SGreg Kroah-Hartman * UART bug of some kind. So, we clamp the timeout parameter at 1368ab4382d2SGreg Kroah-Hartman * 2*port->timeout. 1369ab4382d2SGreg Kroah-Hartman */ 1370ab4382d2SGreg Kroah-Hartman if (timeout == 0 || timeout > 2 * port->timeout) 1371ab4382d2SGreg Kroah-Hartman timeout = 2 * port->timeout; 1372ab4382d2SGreg Kroah-Hartman 1373ab4382d2SGreg Kroah-Hartman expire = jiffies + timeout; 1374ab4382d2SGreg Kroah-Hartman 1375ab4382d2SGreg Kroah-Hartman pr_debug("uart_wait_until_sent(%d), jiffies=%lu, expire=%lu...\n", 1376ab4382d2SGreg Kroah-Hartman port->line, jiffies, expire); 1377ab4382d2SGreg Kroah-Hartman 1378ab4382d2SGreg Kroah-Hartman /* 1379ab4382d2SGreg Kroah-Hartman * Check whether the transmitter is empty every 'char_time'. 1380ab4382d2SGreg Kroah-Hartman * 'timeout' / 'expire' give us the maximum amount of time 1381ab4382d2SGreg Kroah-Hartman * we wait. 1382ab4382d2SGreg Kroah-Hartman */ 1383ab4382d2SGreg Kroah-Hartman while (!port->ops->tx_empty(port)) { 1384ab4382d2SGreg Kroah-Hartman msleep_interruptible(jiffies_to_msecs(char_time)); 1385ab4382d2SGreg Kroah-Hartman if (signal_pending(current)) 1386ab4382d2SGreg Kroah-Hartman break; 1387ab4382d2SGreg Kroah-Hartman if (time_after(jiffies, expire)) 1388ab4382d2SGreg Kroah-Hartman break; 1389ab4382d2SGreg Kroah-Hartman } 1390ab4382d2SGreg Kroah-Hartman } 1391ab4382d2SGreg Kroah-Hartman 1392ab4382d2SGreg Kroah-Hartman /* 1393ab4382d2SGreg Kroah-Hartman * This is called with the BKL held in 1394ab4382d2SGreg Kroah-Hartman * linux/drivers/char/tty_io.c:do_tty_hangup() 1395ab4382d2SGreg Kroah-Hartman * We're called from the eventd thread, so we can sleep for 1396ab4382d2SGreg Kroah-Hartman * a _short_ time only. 1397ab4382d2SGreg Kroah-Hartman */ 1398ab4382d2SGreg Kroah-Hartman static void uart_hangup(struct tty_struct *tty) 1399ab4382d2SGreg Kroah-Hartman { 1400ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1401ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1402ab4382d2SGreg Kroah-Hartman unsigned long flags; 1403ab4382d2SGreg Kroah-Hartman 1404ab4382d2SGreg Kroah-Hartman pr_debug("uart_hangup(%d)\n", state->uart_port->line); 1405ab4382d2SGreg Kroah-Hartman 1406ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1407ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_NORMAL_ACTIVE) { 1408ab4382d2SGreg Kroah-Hartman uart_flush_buffer(tty); 1409ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 1410ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 1411ab4382d2SGreg Kroah-Hartman port->count = 0; 1412ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); 1413ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 1414ab4382d2SGreg Kroah-Hartman tty_port_tty_set(port, NULL); 1415ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->open_wait); 1416ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->delta_msr_wait); 1417ab4382d2SGreg Kroah-Hartman } 1418ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1419ab4382d2SGreg Kroah-Hartman } 1420ab4382d2SGreg Kroah-Hartman 14210b1db830SJiri Slaby static int uart_port_activate(struct tty_port *port, struct tty_struct *tty) 14220b1db830SJiri Slaby { 14230b1db830SJiri Slaby return 0; 14240b1db830SJiri Slaby } 14250b1db830SJiri Slaby 14260b1db830SJiri Slaby static void uart_port_shutdown(struct tty_port *port) 14270b1db830SJiri Slaby { 1428b922e19dSJiri Slaby struct uart_state *state = container_of(port, struct uart_state, port); 1429b922e19dSJiri Slaby struct uart_port *uport = state->uart_port; 1430b922e19dSJiri Slaby 1431b922e19dSJiri Slaby /* 1432b922e19dSJiri Slaby * clear delta_msr_wait queue to avoid mem leaks: we may free 1433b922e19dSJiri Slaby * the irq here so the queue might never be woken up. Note 1434b922e19dSJiri Slaby * that we won't end up waiting on delta_msr_wait again since 1435b922e19dSJiri Slaby * any outstanding file descriptors should be pointing at 1436b922e19dSJiri Slaby * hung_up_tty_fops now. 1437b922e19dSJiri Slaby */ 1438b922e19dSJiri Slaby wake_up_interruptible(&port->delta_msr_wait); 1439b922e19dSJiri Slaby 1440b922e19dSJiri Slaby /* 1441b922e19dSJiri Slaby * Free the IRQ and disable the port. 1442b922e19dSJiri Slaby */ 1443b922e19dSJiri Slaby uport->ops->shutdown(uport); 1444b922e19dSJiri Slaby 1445b922e19dSJiri Slaby /* 1446b922e19dSJiri Slaby * Ensure that the IRQ handler isn't running on another CPU. 1447b922e19dSJiri Slaby */ 1448b922e19dSJiri Slaby synchronize_irq(uport->irq); 14490b1db830SJiri Slaby } 14500b1db830SJiri Slaby 1451ab4382d2SGreg Kroah-Hartman static int uart_carrier_raised(struct tty_port *port) 1452ab4382d2SGreg Kroah-Hartman { 1453ab4382d2SGreg Kroah-Hartman struct uart_state *state = container_of(port, struct uart_state, port); 1454ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1455ab4382d2SGreg Kroah-Hartman int mctrl; 1456ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1457ab4382d2SGreg Kroah-Hartman uport->ops->enable_ms(uport); 1458ab4382d2SGreg Kroah-Hartman mctrl = uport->ops->get_mctrl(uport); 1459ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1460ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_CAR) 1461ab4382d2SGreg Kroah-Hartman return 1; 1462ab4382d2SGreg Kroah-Hartman return 0; 1463ab4382d2SGreg Kroah-Hartman } 1464ab4382d2SGreg Kroah-Hartman 1465ab4382d2SGreg Kroah-Hartman static void uart_dtr_rts(struct tty_port *port, int onoff) 1466ab4382d2SGreg Kroah-Hartman { 1467ab4382d2SGreg Kroah-Hartman struct uart_state *state = container_of(port, struct uart_state, port); 1468ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1469ab4382d2SGreg Kroah-Hartman 14706f5c24adSJiri Slaby if (onoff) 1471ab4382d2SGreg Kroah-Hartman uart_set_mctrl(uport, TIOCM_DTR | TIOCM_RTS); 1472ab4382d2SGreg Kroah-Hartman else 1473ab4382d2SGreg Kroah-Hartman uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); 1474ab4382d2SGreg Kroah-Hartman } 1475ab4382d2SGreg Kroah-Hartman 1476ab4382d2SGreg Kroah-Hartman /* 1477ab4382d2SGreg Kroah-Hartman * calls to uart_open are serialised by the BKL in 1478ab4382d2SGreg Kroah-Hartman * fs/char_dev.c:chrdev_open() 1479ab4382d2SGreg Kroah-Hartman * Note that if this fails, then uart_close() _will_ be called. 1480ab4382d2SGreg Kroah-Hartman * 1481ab4382d2SGreg Kroah-Hartman * In time, we want to scrap the "opening nonpresent ports" 1482ab4382d2SGreg Kroah-Hartman * behaviour and implement an alternative way for setserial 1483ab4382d2SGreg Kroah-Hartman * to set base addresses/ports/types. This will allow us to 1484ab4382d2SGreg Kroah-Hartman * get rid of a certain amount of extra tests. 1485ab4382d2SGreg Kroah-Hartman */ 1486ab4382d2SGreg Kroah-Hartman static int uart_open(struct tty_struct *tty, struct file *filp) 1487ab4382d2SGreg Kroah-Hartman { 1488ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = (struct uart_driver *)tty->driver->driver_state; 1489ab4382d2SGreg Kroah-Hartman int retval, line = tty->index; 14901c7b13c4SJiri Slaby struct uart_state *state = drv->state + line; 14911c7b13c4SJiri Slaby struct tty_port *port = &state->port; 1492ab4382d2SGreg Kroah-Hartman 1493ab4382d2SGreg Kroah-Hartman pr_debug("uart_open(%d) called\n", line); 1494ab4382d2SGreg Kroah-Hartman 1495ab4382d2SGreg Kroah-Hartman /* 14961c7b13c4SJiri Slaby * We take the semaphore here to guarantee that we won't be re-entered 14971c7b13c4SJiri Slaby * while allocating the state structure, or while we request any IRQs 14981c7b13c4SJiri Slaby * that the driver may need. This also has the nice side-effect that 14991c7b13c4SJiri Slaby * it delays the action of uart_hangup, so we can guarantee that 15001c7b13c4SJiri Slaby * state->port.tty will always contain something reasonable. 1501ab4382d2SGreg Kroah-Hartman */ 15021c7b13c4SJiri Slaby if (mutex_lock_interruptible(&port->mutex)) { 15031c7b13c4SJiri Slaby retval = -ERESTARTSYS; 15041c7b13c4SJiri Slaby goto end; 1505ab4382d2SGreg Kroah-Hartman } 15061c7b13c4SJiri Slaby 15071c7b13c4SJiri Slaby port->count++; 15081c7b13c4SJiri Slaby if (!state->uart_port || state->uart_port->flags & UPF_DEAD) { 15091c7b13c4SJiri Slaby retval = -ENXIO; 15101c7b13c4SJiri Slaby goto err_dec_count; 15111c7b13c4SJiri Slaby } 1512ab4382d2SGreg Kroah-Hartman 1513ab4382d2SGreg Kroah-Hartman /* 1514ab4382d2SGreg Kroah-Hartman * Once we set tty->driver_data here, we are guaranteed that 1515ab4382d2SGreg Kroah-Hartman * uart_close() will decrement the driver module use count. 1516ab4382d2SGreg Kroah-Hartman * Any failures from here onwards should not touch the count. 1517ab4382d2SGreg Kroah-Hartman */ 1518ab4382d2SGreg Kroah-Hartman tty->driver_data = state; 1519ab4382d2SGreg Kroah-Hartman state->uart_port->state = state; 1520ab4382d2SGreg Kroah-Hartman tty->low_latency = (state->uart_port->flags & UPF_LOW_LATENCY) ? 1 : 0; 1521ab4382d2SGreg Kroah-Hartman tty_port_tty_set(port, tty); 1522ab4382d2SGreg Kroah-Hartman 1523ab4382d2SGreg Kroah-Hartman /* 1524ab4382d2SGreg Kroah-Hartman * If the port is in the middle of closing, bail out now. 1525ab4382d2SGreg Kroah-Hartman */ 1526ab4382d2SGreg Kroah-Hartman if (tty_hung_up_p(filp)) { 1527ab4382d2SGreg Kroah-Hartman retval = -EAGAIN; 15281c7b13c4SJiri Slaby goto err_dec_count; 1529ab4382d2SGreg Kroah-Hartman } 1530ab4382d2SGreg Kroah-Hartman 1531ab4382d2SGreg Kroah-Hartman /* 1532ab4382d2SGreg Kroah-Hartman * Make sure the device is in D0 state. 1533ab4382d2SGreg Kroah-Hartman */ 1534ab4382d2SGreg Kroah-Hartman if (port->count == 1) 1535ab4382d2SGreg Kroah-Hartman uart_change_pm(state, 0); 1536ab4382d2SGreg Kroah-Hartman 1537ab4382d2SGreg Kroah-Hartman /* 1538ab4382d2SGreg Kroah-Hartman * Start up the serial port. 1539ab4382d2SGreg Kroah-Hartman */ 1540ab4382d2SGreg Kroah-Hartman retval = uart_startup(tty, state, 0); 1541ab4382d2SGreg Kroah-Hartman 1542ab4382d2SGreg Kroah-Hartman /* 1543ab4382d2SGreg Kroah-Hartman * If we succeeded, wait until the port is ready. 1544ab4382d2SGreg Kroah-Hartman */ 1545ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1546ab4382d2SGreg Kroah-Hartman if (retval == 0) 1547ab4382d2SGreg Kroah-Hartman retval = tty_port_block_til_ready(port, tty, filp); 1548ab4382d2SGreg Kroah-Hartman 15491c7b13c4SJiri Slaby end: 1550ab4382d2SGreg Kroah-Hartman return retval; 15511c7b13c4SJiri Slaby err_dec_count: 15521c7b13c4SJiri Slaby port->count--; 15531c7b13c4SJiri Slaby mutex_unlock(&port->mutex); 15541c7b13c4SJiri Slaby goto end; 1555ab4382d2SGreg Kroah-Hartman } 1556ab4382d2SGreg Kroah-Hartman 1557ab4382d2SGreg Kroah-Hartman static const char *uart_type(struct uart_port *port) 1558ab4382d2SGreg Kroah-Hartman { 1559ab4382d2SGreg Kroah-Hartman const char *str = NULL; 1560ab4382d2SGreg Kroah-Hartman 1561ab4382d2SGreg Kroah-Hartman if (port->ops->type) 1562ab4382d2SGreg Kroah-Hartman str = port->ops->type(port); 1563ab4382d2SGreg Kroah-Hartman 1564ab4382d2SGreg Kroah-Hartman if (!str) 1565ab4382d2SGreg Kroah-Hartman str = "unknown"; 1566ab4382d2SGreg Kroah-Hartman 1567ab4382d2SGreg Kroah-Hartman return str; 1568ab4382d2SGreg Kroah-Hartman } 1569ab4382d2SGreg Kroah-Hartman 1570ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_PROC_FS 1571ab4382d2SGreg Kroah-Hartman 1572ab4382d2SGreg Kroah-Hartman static void uart_line_info(struct seq_file *m, struct uart_driver *drv, int i) 1573ab4382d2SGreg Kroah-Hartman { 1574ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + i; 1575ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1576ab4382d2SGreg Kroah-Hartman int pm_state; 1577ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1578ab4382d2SGreg Kroah-Hartman char stat_buf[32]; 1579ab4382d2SGreg Kroah-Hartman unsigned int status; 1580ab4382d2SGreg Kroah-Hartman int mmio; 1581ab4382d2SGreg Kroah-Hartman 1582ab4382d2SGreg Kroah-Hartman if (!uport) 1583ab4382d2SGreg Kroah-Hartman return; 1584ab4382d2SGreg Kroah-Hartman 1585ab4382d2SGreg Kroah-Hartman mmio = uport->iotype >= UPIO_MEM; 1586ab4382d2SGreg Kroah-Hartman seq_printf(m, "%d: uart:%s %s%08llX irq:%d", 1587ab4382d2SGreg Kroah-Hartman uport->line, uart_type(uport), 1588ab4382d2SGreg Kroah-Hartman mmio ? "mmio:0x" : "port:", 1589ab4382d2SGreg Kroah-Hartman mmio ? (unsigned long long)uport->mapbase 1590ab4382d2SGreg Kroah-Hartman : (unsigned long long)uport->iobase, 1591ab4382d2SGreg Kroah-Hartman uport->irq); 1592ab4382d2SGreg Kroah-Hartman 1593ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) { 1594ab4382d2SGreg Kroah-Hartman seq_putc(m, '\n'); 1595ab4382d2SGreg Kroah-Hartman return; 1596ab4382d2SGreg Kroah-Hartman } 1597ab4382d2SGreg Kroah-Hartman 1598ab4382d2SGreg Kroah-Hartman if (capable(CAP_SYS_ADMIN)) { 1599ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1600ab4382d2SGreg Kroah-Hartman pm_state = state->pm_state; 1601ab4382d2SGreg Kroah-Hartman if (pm_state) 1602ab4382d2SGreg Kroah-Hartman uart_change_pm(state, 0); 1603ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1604ab4382d2SGreg Kroah-Hartman status = uport->ops->get_mctrl(uport); 1605ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1606ab4382d2SGreg Kroah-Hartman if (pm_state) 1607ab4382d2SGreg Kroah-Hartman uart_change_pm(state, pm_state); 1608ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1609ab4382d2SGreg Kroah-Hartman 1610ab4382d2SGreg Kroah-Hartman seq_printf(m, " tx:%d rx:%d", 1611ab4382d2SGreg Kroah-Hartman uport->icount.tx, uport->icount.rx); 1612ab4382d2SGreg Kroah-Hartman if (uport->icount.frame) 1613ab4382d2SGreg Kroah-Hartman seq_printf(m, " fe:%d", 1614ab4382d2SGreg Kroah-Hartman uport->icount.frame); 1615ab4382d2SGreg Kroah-Hartman if (uport->icount.parity) 1616ab4382d2SGreg Kroah-Hartman seq_printf(m, " pe:%d", 1617ab4382d2SGreg Kroah-Hartman uport->icount.parity); 1618ab4382d2SGreg Kroah-Hartman if (uport->icount.brk) 1619ab4382d2SGreg Kroah-Hartman seq_printf(m, " brk:%d", 1620ab4382d2SGreg Kroah-Hartman uport->icount.brk); 1621ab4382d2SGreg Kroah-Hartman if (uport->icount.overrun) 1622ab4382d2SGreg Kroah-Hartman seq_printf(m, " oe:%d", 1623ab4382d2SGreg Kroah-Hartman uport->icount.overrun); 1624ab4382d2SGreg Kroah-Hartman 1625ab4382d2SGreg Kroah-Hartman #define INFOBIT(bit, str) \ 1626ab4382d2SGreg Kroah-Hartman if (uport->mctrl & (bit)) \ 1627ab4382d2SGreg Kroah-Hartman strncat(stat_buf, (str), sizeof(stat_buf) - \ 1628ab4382d2SGreg Kroah-Hartman strlen(stat_buf) - 2) 1629ab4382d2SGreg Kroah-Hartman #define STATBIT(bit, str) \ 1630ab4382d2SGreg Kroah-Hartman if (status & (bit)) \ 1631ab4382d2SGreg Kroah-Hartman strncat(stat_buf, (str), sizeof(stat_buf) - \ 1632ab4382d2SGreg Kroah-Hartman strlen(stat_buf) - 2) 1633ab4382d2SGreg Kroah-Hartman 1634ab4382d2SGreg Kroah-Hartman stat_buf[0] = '\0'; 1635ab4382d2SGreg Kroah-Hartman stat_buf[1] = '\0'; 1636ab4382d2SGreg Kroah-Hartman INFOBIT(TIOCM_RTS, "|RTS"); 1637ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_CTS, "|CTS"); 1638ab4382d2SGreg Kroah-Hartman INFOBIT(TIOCM_DTR, "|DTR"); 1639ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_DSR, "|DSR"); 1640ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_CAR, "|CD"); 1641ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_RNG, "|RI"); 1642ab4382d2SGreg Kroah-Hartman if (stat_buf[0]) 1643ab4382d2SGreg Kroah-Hartman stat_buf[0] = ' '; 1644ab4382d2SGreg Kroah-Hartman 1645ab4382d2SGreg Kroah-Hartman seq_puts(m, stat_buf); 1646ab4382d2SGreg Kroah-Hartman } 1647ab4382d2SGreg Kroah-Hartman seq_putc(m, '\n'); 1648ab4382d2SGreg Kroah-Hartman #undef STATBIT 1649ab4382d2SGreg Kroah-Hartman #undef INFOBIT 1650ab4382d2SGreg Kroah-Hartman } 1651ab4382d2SGreg Kroah-Hartman 1652ab4382d2SGreg Kroah-Hartman static int uart_proc_show(struct seq_file *m, void *v) 1653ab4382d2SGreg Kroah-Hartman { 1654ab4382d2SGreg Kroah-Hartman struct tty_driver *ttydrv = m->private; 1655ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = ttydrv->driver_state; 1656ab4382d2SGreg Kroah-Hartman int i; 1657ab4382d2SGreg Kroah-Hartman 1658ab4382d2SGreg Kroah-Hartman seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n", 1659ab4382d2SGreg Kroah-Hartman "", "", ""); 1660ab4382d2SGreg Kroah-Hartman for (i = 0; i < drv->nr; i++) 1661ab4382d2SGreg Kroah-Hartman uart_line_info(m, drv, i); 1662ab4382d2SGreg Kroah-Hartman return 0; 1663ab4382d2SGreg Kroah-Hartman } 1664ab4382d2SGreg Kroah-Hartman 1665ab4382d2SGreg Kroah-Hartman static int uart_proc_open(struct inode *inode, struct file *file) 1666ab4382d2SGreg Kroah-Hartman { 1667ab4382d2SGreg Kroah-Hartman return single_open(file, uart_proc_show, PDE(inode)->data); 1668ab4382d2SGreg Kroah-Hartman } 1669ab4382d2SGreg Kroah-Hartman 1670ab4382d2SGreg Kroah-Hartman static const struct file_operations uart_proc_fops = { 1671ab4382d2SGreg Kroah-Hartman .owner = THIS_MODULE, 1672ab4382d2SGreg Kroah-Hartman .open = uart_proc_open, 1673ab4382d2SGreg Kroah-Hartman .read = seq_read, 1674ab4382d2SGreg Kroah-Hartman .llseek = seq_lseek, 1675ab4382d2SGreg Kroah-Hartman .release = single_release, 1676ab4382d2SGreg Kroah-Hartman }; 1677ab4382d2SGreg Kroah-Hartman #endif 1678ab4382d2SGreg Kroah-Hartman 1679ab4382d2SGreg Kroah-Hartman #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL) 1680ab4382d2SGreg Kroah-Hartman /* 1681ab4382d2SGreg Kroah-Hartman * uart_console_write - write a console message to a serial port 1682ab4382d2SGreg Kroah-Hartman * @port: the port to write the message 1683ab4382d2SGreg Kroah-Hartman * @s: array of characters 1684ab4382d2SGreg Kroah-Hartman * @count: number of characters in string to write 1685ab4382d2SGreg Kroah-Hartman * @write: function to write character to port 1686ab4382d2SGreg Kroah-Hartman */ 1687ab4382d2SGreg Kroah-Hartman void uart_console_write(struct uart_port *port, const char *s, 1688ab4382d2SGreg Kroah-Hartman unsigned int count, 1689ab4382d2SGreg Kroah-Hartman void (*putchar)(struct uart_port *, int)) 1690ab4382d2SGreg Kroah-Hartman { 1691ab4382d2SGreg Kroah-Hartman unsigned int i; 1692ab4382d2SGreg Kroah-Hartman 1693ab4382d2SGreg Kroah-Hartman for (i = 0; i < count; i++, s++) { 1694ab4382d2SGreg Kroah-Hartman if (*s == '\n') 1695ab4382d2SGreg Kroah-Hartman putchar(port, '\r'); 1696ab4382d2SGreg Kroah-Hartman putchar(port, *s); 1697ab4382d2SGreg Kroah-Hartman } 1698ab4382d2SGreg Kroah-Hartman } 1699ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_console_write); 1700ab4382d2SGreg Kroah-Hartman 1701ab4382d2SGreg Kroah-Hartman /* 1702ab4382d2SGreg Kroah-Hartman * Check whether an invalid uart number has been specified, and 1703ab4382d2SGreg Kroah-Hartman * if so, search for the first available port that does have 1704ab4382d2SGreg Kroah-Hartman * console support. 1705ab4382d2SGreg Kroah-Hartman */ 1706ab4382d2SGreg Kroah-Hartman struct uart_port * __init 1707ab4382d2SGreg Kroah-Hartman uart_get_console(struct uart_port *ports, int nr, struct console *co) 1708ab4382d2SGreg Kroah-Hartman { 1709ab4382d2SGreg Kroah-Hartman int idx = co->index; 1710ab4382d2SGreg Kroah-Hartman 1711ab4382d2SGreg Kroah-Hartman if (idx < 0 || idx >= nr || (ports[idx].iobase == 0 && 1712ab4382d2SGreg Kroah-Hartman ports[idx].membase == NULL)) 1713ab4382d2SGreg Kroah-Hartman for (idx = 0; idx < nr; idx++) 1714ab4382d2SGreg Kroah-Hartman if (ports[idx].iobase != 0 || 1715ab4382d2SGreg Kroah-Hartman ports[idx].membase != NULL) 1716ab4382d2SGreg Kroah-Hartman break; 1717ab4382d2SGreg Kroah-Hartman 1718ab4382d2SGreg Kroah-Hartman co->index = idx; 1719ab4382d2SGreg Kroah-Hartman 1720ab4382d2SGreg Kroah-Hartman return ports + idx; 1721ab4382d2SGreg Kroah-Hartman } 1722ab4382d2SGreg Kroah-Hartman 1723ab4382d2SGreg Kroah-Hartman /** 1724ab4382d2SGreg Kroah-Hartman * uart_parse_options - Parse serial port baud/parity/bits/flow contro. 1725ab4382d2SGreg Kroah-Hartman * @options: pointer to option string 1726ab4382d2SGreg Kroah-Hartman * @baud: pointer to an 'int' variable for the baud rate. 1727ab4382d2SGreg Kroah-Hartman * @parity: pointer to an 'int' variable for the parity. 1728ab4382d2SGreg Kroah-Hartman * @bits: pointer to an 'int' variable for the number of data bits. 1729ab4382d2SGreg Kroah-Hartman * @flow: pointer to an 'int' variable for the flow control character. 1730ab4382d2SGreg Kroah-Hartman * 1731ab4382d2SGreg Kroah-Hartman * uart_parse_options decodes a string containing the serial console 1732ab4382d2SGreg Kroah-Hartman * options. The format of the string is <baud><parity><bits><flow>, 1733ab4382d2SGreg Kroah-Hartman * eg: 115200n8r 1734ab4382d2SGreg Kroah-Hartman */ 1735ab4382d2SGreg Kroah-Hartman void 1736ab4382d2SGreg Kroah-Hartman uart_parse_options(char *options, int *baud, int *parity, int *bits, int *flow) 1737ab4382d2SGreg Kroah-Hartman { 1738ab4382d2SGreg Kroah-Hartman char *s = options; 1739ab4382d2SGreg Kroah-Hartman 1740ab4382d2SGreg Kroah-Hartman *baud = simple_strtoul(s, NULL, 10); 1741ab4382d2SGreg Kroah-Hartman while (*s >= '0' && *s <= '9') 1742ab4382d2SGreg Kroah-Hartman s++; 1743ab4382d2SGreg Kroah-Hartman if (*s) 1744ab4382d2SGreg Kroah-Hartman *parity = *s++; 1745ab4382d2SGreg Kroah-Hartman if (*s) 1746ab4382d2SGreg Kroah-Hartman *bits = *s++ - '0'; 1747ab4382d2SGreg Kroah-Hartman if (*s) 1748ab4382d2SGreg Kroah-Hartman *flow = *s; 1749ab4382d2SGreg Kroah-Hartman } 1750ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_parse_options); 1751ab4382d2SGreg Kroah-Hartman 1752ab4382d2SGreg Kroah-Hartman struct baud_rates { 1753ab4382d2SGreg Kroah-Hartman unsigned int rate; 1754ab4382d2SGreg Kroah-Hartman unsigned int cflag; 1755ab4382d2SGreg Kroah-Hartman }; 1756ab4382d2SGreg Kroah-Hartman 1757ab4382d2SGreg Kroah-Hartman static const struct baud_rates baud_rates[] = { 1758ab4382d2SGreg Kroah-Hartman { 921600, B921600 }, 1759ab4382d2SGreg Kroah-Hartman { 460800, B460800 }, 1760ab4382d2SGreg Kroah-Hartman { 230400, B230400 }, 1761ab4382d2SGreg Kroah-Hartman { 115200, B115200 }, 1762ab4382d2SGreg Kroah-Hartman { 57600, B57600 }, 1763ab4382d2SGreg Kroah-Hartman { 38400, B38400 }, 1764ab4382d2SGreg Kroah-Hartman { 19200, B19200 }, 1765ab4382d2SGreg Kroah-Hartman { 9600, B9600 }, 1766ab4382d2SGreg Kroah-Hartman { 4800, B4800 }, 1767ab4382d2SGreg Kroah-Hartman { 2400, B2400 }, 1768ab4382d2SGreg Kroah-Hartman { 1200, B1200 }, 1769ab4382d2SGreg Kroah-Hartman { 0, B38400 } 1770ab4382d2SGreg Kroah-Hartman }; 1771ab4382d2SGreg Kroah-Hartman 1772ab4382d2SGreg Kroah-Hartman /** 1773ab4382d2SGreg Kroah-Hartman * uart_set_options - setup the serial console parameters 1774ab4382d2SGreg Kroah-Hartman * @port: pointer to the serial ports uart_port structure 1775ab4382d2SGreg Kroah-Hartman * @co: console pointer 1776ab4382d2SGreg Kroah-Hartman * @baud: baud rate 1777ab4382d2SGreg Kroah-Hartman * @parity: parity character - 'n' (none), 'o' (odd), 'e' (even) 1778ab4382d2SGreg Kroah-Hartman * @bits: number of data bits 1779ab4382d2SGreg Kroah-Hartman * @flow: flow control character - 'r' (rts) 1780ab4382d2SGreg Kroah-Hartman */ 1781ab4382d2SGreg Kroah-Hartman int 1782ab4382d2SGreg Kroah-Hartman uart_set_options(struct uart_port *port, struct console *co, 1783ab4382d2SGreg Kroah-Hartman int baud, int parity, int bits, int flow) 1784ab4382d2SGreg Kroah-Hartman { 1785ab4382d2SGreg Kroah-Hartman struct ktermios termios; 1786ab4382d2SGreg Kroah-Hartman static struct ktermios dummy; 1787ab4382d2SGreg Kroah-Hartman int i; 1788ab4382d2SGreg Kroah-Hartman 1789ab4382d2SGreg Kroah-Hartman /* 1790ab4382d2SGreg Kroah-Hartman * Ensure that the serial console lock is initialised 1791ab4382d2SGreg Kroah-Hartman * early. 1792ab4382d2SGreg Kroah-Hartman */ 1793ab4382d2SGreg Kroah-Hartman spin_lock_init(&port->lock); 1794ab4382d2SGreg Kroah-Hartman lockdep_set_class(&port->lock, &port_lock_key); 1795ab4382d2SGreg Kroah-Hartman 1796ab4382d2SGreg Kroah-Hartman memset(&termios, 0, sizeof(struct ktermios)); 1797ab4382d2SGreg Kroah-Hartman 1798ab4382d2SGreg Kroah-Hartman termios.c_cflag = CREAD | HUPCL | CLOCAL; 1799ab4382d2SGreg Kroah-Hartman 1800ab4382d2SGreg Kroah-Hartman /* 1801ab4382d2SGreg Kroah-Hartman * Construct a cflag setting. 1802ab4382d2SGreg Kroah-Hartman */ 1803ab4382d2SGreg Kroah-Hartman for (i = 0; baud_rates[i].rate; i++) 1804ab4382d2SGreg Kroah-Hartman if (baud_rates[i].rate <= baud) 1805ab4382d2SGreg Kroah-Hartman break; 1806ab4382d2SGreg Kroah-Hartman 1807ab4382d2SGreg Kroah-Hartman termios.c_cflag |= baud_rates[i].cflag; 1808ab4382d2SGreg Kroah-Hartman 1809ab4382d2SGreg Kroah-Hartman if (bits == 7) 1810ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CS7; 1811ab4382d2SGreg Kroah-Hartman else 1812ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CS8; 1813ab4382d2SGreg Kroah-Hartman 1814ab4382d2SGreg Kroah-Hartman switch (parity) { 1815ab4382d2SGreg Kroah-Hartman case 'o': case 'O': 1816ab4382d2SGreg Kroah-Hartman termios.c_cflag |= PARODD; 1817ab4382d2SGreg Kroah-Hartman /*fall through*/ 1818ab4382d2SGreg Kroah-Hartman case 'e': case 'E': 1819ab4382d2SGreg Kroah-Hartman termios.c_cflag |= PARENB; 1820ab4382d2SGreg Kroah-Hartman break; 1821ab4382d2SGreg Kroah-Hartman } 1822ab4382d2SGreg Kroah-Hartman 1823ab4382d2SGreg Kroah-Hartman if (flow == 'r') 1824ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CRTSCTS; 1825ab4382d2SGreg Kroah-Hartman 1826ab4382d2SGreg Kroah-Hartman /* 1827ab4382d2SGreg Kroah-Hartman * some uarts on other side don't support no flow control. 1828ab4382d2SGreg Kroah-Hartman * So we set * DTR in host uart to make them happy 1829ab4382d2SGreg Kroah-Hartman */ 1830ab4382d2SGreg Kroah-Hartman port->mctrl |= TIOCM_DTR; 1831ab4382d2SGreg Kroah-Hartman 1832ab4382d2SGreg Kroah-Hartman port->ops->set_termios(port, &termios, &dummy); 1833ab4382d2SGreg Kroah-Hartman /* 1834ab4382d2SGreg Kroah-Hartman * Allow the setting of the UART parameters with a NULL console 1835ab4382d2SGreg Kroah-Hartman * too: 1836ab4382d2SGreg Kroah-Hartman */ 1837ab4382d2SGreg Kroah-Hartman if (co) 1838ab4382d2SGreg Kroah-Hartman co->cflag = termios.c_cflag; 1839ab4382d2SGreg Kroah-Hartman 1840ab4382d2SGreg Kroah-Hartman return 0; 1841ab4382d2SGreg Kroah-Hartman } 1842ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_set_options); 1843ab4382d2SGreg Kroah-Hartman #endif /* CONFIG_SERIAL_CORE_CONSOLE */ 1844ab4382d2SGreg Kroah-Hartman 1845cf75525fSJiri Slaby /** 1846cf75525fSJiri Slaby * uart_change_pm - set power state of the port 1847cf75525fSJiri Slaby * 1848cf75525fSJiri Slaby * @state: port descriptor 1849cf75525fSJiri Slaby * @pm_state: new state 1850cf75525fSJiri Slaby * 1851cf75525fSJiri Slaby * Locking: port->mutex has to be held 1852cf75525fSJiri Slaby */ 1853ab4382d2SGreg Kroah-Hartman static void uart_change_pm(struct uart_state *state, int pm_state) 1854ab4382d2SGreg Kroah-Hartman { 1855ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 1856ab4382d2SGreg Kroah-Hartman 1857ab4382d2SGreg Kroah-Hartman if (state->pm_state != pm_state) { 1858ab4382d2SGreg Kroah-Hartman if (port->ops->pm) 1859ab4382d2SGreg Kroah-Hartman port->ops->pm(port, pm_state, state->pm_state); 1860ab4382d2SGreg Kroah-Hartman state->pm_state = pm_state; 1861ab4382d2SGreg Kroah-Hartman } 1862ab4382d2SGreg Kroah-Hartman } 1863ab4382d2SGreg Kroah-Hartman 1864ab4382d2SGreg Kroah-Hartman struct uart_match { 1865ab4382d2SGreg Kroah-Hartman struct uart_port *port; 1866ab4382d2SGreg Kroah-Hartman struct uart_driver *driver; 1867ab4382d2SGreg Kroah-Hartman }; 1868ab4382d2SGreg Kroah-Hartman 1869ab4382d2SGreg Kroah-Hartman static int serial_match_port(struct device *dev, void *data) 1870ab4382d2SGreg Kroah-Hartman { 1871ab4382d2SGreg Kroah-Hartman struct uart_match *match = data; 1872ab4382d2SGreg Kroah-Hartman struct tty_driver *tty_drv = match->driver->tty_driver; 1873ab4382d2SGreg Kroah-Hartman dev_t devt = MKDEV(tty_drv->major, tty_drv->minor_start) + 1874ab4382d2SGreg Kroah-Hartman match->port->line; 1875ab4382d2SGreg Kroah-Hartman 1876ab4382d2SGreg Kroah-Hartman return dev->devt == devt; /* Actually, only one tty per port */ 1877ab4382d2SGreg Kroah-Hartman } 1878ab4382d2SGreg Kroah-Hartman 1879ab4382d2SGreg Kroah-Hartman int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport) 1880ab4382d2SGreg Kroah-Hartman { 1881ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 1882ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1883ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 1884ab4382d2SGreg Kroah-Hartman struct uart_match match = {uport, drv}; 1885ab4382d2SGreg Kroah-Hartman 1886ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1887ab4382d2SGreg Kroah-Hartman 1888ab4382d2SGreg Kroah-Hartman tty_dev = device_find_child(uport->dev, &match, serial_match_port); 1889ab4382d2SGreg Kroah-Hartman if (device_may_wakeup(tty_dev)) { 1890ab4382d2SGreg Kroah-Hartman if (!enable_irq_wake(uport->irq)) 1891ab4382d2SGreg Kroah-Hartman uport->irq_wake = 1; 1892ab4382d2SGreg Kroah-Hartman put_device(tty_dev); 1893ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1894ab4382d2SGreg Kroah-Hartman return 0; 1895ab4382d2SGreg Kroah-Hartman } 1896ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) 1897ab4382d2SGreg Kroah-Hartman uport->suspended = 1; 1898ab4382d2SGreg Kroah-Hartman 1899ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_INITIALIZED) { 1900ab4382d2SGreg Kroah-Hartman const struct uart_ops *ops = uport->ops; 1901ab4382d2SGreg Kroah-Hartman int tries; 1902ab4382d2SGreg Kroah-Hartman 1903ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) { 1904ab4382d2SGreg Kroah-Hartman set_bit(ASYNCB_SUSPENDED, &port->flags); 1905ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_INITIALIZED, &port->flags); 1906ab4382d2SGreg Kroah-Hartman 1907ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1908ab4382d2SGreg Kroah-Hartman ops->stop_tx(uport); 1909ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, 0); 1910ab4382d2SGreg Kroah-Hartman ops->stop_rx(uport); 1911ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1912ab4382d2SGreg Kroah-Hartman } 1913ab4382d2SGreg Kroah-Hartman 1914ab4382d2SGreg Kroah-Hartman /* 1915ab4382d2SGreg Kroah-Hartman * Wait for the transmitter to empty. 1916ab4382d2SGreg Kroah-Hartman */ 1917ab4382d2SGreg Kroah-Hartman for (tries = 3; !ops->tx_empty(uport) && tries; tries--) 1918ab4382d2SGreg Kroah-Hartman msleep(10); 1919ab4382d2SGreg Kroah-Hartman if (!tries) 1920ab4382d2SGreg Kroah-Hartman printk(KERN_ERR "%s%s%s%d: Unable to drain " 1921ab4382d2SGreg Kroah-Hartman "transmitter\n", 1922ab4382d2SGreg Kroah-Hartman uport->dev ? dev_name(uport->dev) : "", 1923ab4382d2SGreg Kroah-Hartman uport->dev ? ": " : "", 1924ab4382d2SGreg Kroah-Hartman drv->dev_name, 1925ab4382d2SGreg Kroah-Hartman drv->tty_driver->name_base + uport->line); 1926ab4382d2SGreg Kroah-Hartman 1927ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) 1928ab4382d2SGreg Kroah-Hartman ops->shutdown(uport); 1929ab4382d2SGreg Kroah-Hartman } 1930ab4382d2SGreg Kroah-Hartman 1931ab4382d2SGreg Kroah-Hartman /* 1932ab4382d2SGreg Kroah-Hartman * Disable the console device before suspending. 1933ab4382d2SGreg Kroah-Hartman */ 1934ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled && uart_console(uport)) 1935ab4382d2SGreg Kroah-Hartman console_stop(uport->cons); 1936ab4382d2SGreg Kroah-Hartman 1937ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) 1938ab4382d2SGreg Kroah-Hartman uart_change_pm(state, 3); 1939ab4382d2SGreg Kroah-Hartman 1940ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1941ab4382d2SGreg Kroah-Hartman 1942ab4382d2SGreg Kroah-Hartman return 0; 1943ab4382d2SGreg Kroah-Hartman } 1944ab4382d2SGreg Kroah-Hartman 1945ab4382d2SGreg Kroah-Hartman int uart_resume_port(struct uart_driver *drv, struct uart_port *uport) 1946ab4382d2SGreg Kroah-Hartman { 1947ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 1948ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1949ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 1950ab4382d2SGreg Kroah-Hartman struct uart_match match = {uport, drv}; 1951ab4382d2SGreg Kroah-Hartman struct ktermios termios; 1952ab4382d2SGreg Kroah-Hartman 1953ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1954ab4382d2SGreg Kroah-Hartman 1955ab4382d2SGreg Kroah-Hartman tty_dev = device_find_child(uport->dev, &match, serial_match_port); 1956ab4382d2SGreg Kroah-Hartman if (!uport->suspended && device_may_wakeup(tty_dev)) { 1957ab4382d2SGreg Kroah-Hartman if (uport->irq_wake) { 1958ab4382d2SGreg Kroah-Hartman disable_irq_wake(uport->irq); 1959ab4382d2SGreg Kroah-Hartman uport->irq_wake = 0; 1960ab4382d2SGreg Kroah-Hartman } 1961ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1962ab4382d2SGreg Kroah-Hartman return 0; 1963ab4382d2SGreg Kroah-Hartman } 1964ab4382d2SGreg Kroah-Hartman uport->suspended = 0; 1965ab4382d2SGreg Kroah-Hartman 1966ab4382d2SGreg Kroah-Hartman /* 1967ab4382d2SGreg Kroah-Hartman * Re-enable the console device after suspending. 1968ab4382d2SGreg Kroah-Hartman */ 19695933a161SYin Kangkai if (uart_console(uport)) { 1970ab4382d2SGreg Kroah-Hartman /* 1971ab4382d2SGreg Kroah-Hartman * First try to use the console cflag setting. 1972ab4382d2SGreg Kroah-Hartman */ 1973ab4382d2SGreg Kroah-Hartman memset(&termios, 0, sizeof(struct ktermios)); 1974ab4382d2SGreg Kroah-Hartman termios.c_cflag = uport->cons->cflag; 1975ab4382d2SGreg Kroah-Hartman 1976ab4382d2SGreg Kroah-Hartman /* 1977ab4382d2SGreg Kroah-Hartman * If that's unset, use the tty termios setting. 1978ab4382d2SGreg Kroah-Hartman */ 1979adc8d746SAlan Cox if (port->tty && termios.c_cflag == 0) 1980adc8d746SAlan Cox termios = port->tty->termios; 1981ab4382d2SGreg Kroah-Hartman 198294abc56fSNing Jiang if (console_suspend_enabled) 198394abc56fSNing Jiang uart_change_pm(state, 0); 1984ab4382d2SGreg Kroah-Hartman uport->ops->set_termios(uport, &termios, NULL); 19855933a161SYin Kangkai if (console_suspend_enabled) 1986ab4382d2SGreg Kroah-Hartman console_start(uport->cons); 1987ab4382d2SGreg Kroah-Hartman } 1988ab4382d2SGreg Kroah-Hartman 1989ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_SUSPENDED) { 1990ab4382d2SGreg Kroah-Hartman const struct uart_ops *ops = uport->ops; 1991ab4382d2SGreg Kroah-Hartman int ret; 1992ab4382d2SGreg Kroah-Hartman 1993ab4382d2SGreg Kroah-Hartman uart_change_pm(state, 0); 1994ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1995ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, 0); 1996ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1997ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) { 1998ab4382d2SGreg Kroah-Hartman /* Protected by port mutex for now */ 1999ab4382d2SGreg Kroah-Hartman struct tty_struct *tty = port->tty; 2000ab4382d2SGreg Kroah-Hartman ret = ops->startup(uport); 2001ab4382d2SGreg Kroah-Hartman if (ret == 0) { 2002ab4382d2SGreg Kroah-Hartman if (tty) 2003ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 2004ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 2005ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, uport->mctrl); 2006ab4382d2SGreg Kroah-Hartman ops->start_tx(uport); 2007ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2008ab4382d2SGreg Kroah-Hartman set_bit(ASYNCB_INITIALIZED, &port->flags); 2009ab4382d2SGreg Kroah-Hartman } else { 2010ab4382d2SGreg Kroah-Hartman /* 2011ab4382d2SGreg Kroah-Hartman * Failed to resume - maybe hardware went away? 2012ab4382d2SGreg Kroah-Hartman * Clear the "initialized" flag so we won't try 2013ab4382d2SGreg Kroah-Hartman * to call the low level drivers shutdown method. 2014ab4382d2SGreg Kroah-Hartman */ 2015ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 2016ab4382d2SGreg Kroah-Hartman } 2017ab4382d2SGreg Kroah-Hartman } 2018ab4382d2SGreg Kroah-Hartman 2019ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_SUSPENDED, &port->flags); 2020ab4382d2SGreg Kroah-Hartman } 2021ab4382d2SGreg Kroah-Hartman 2022ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2023ab4382d2SGreg Kroah-Hartman 2024ab4382d2SGreg Kroah-Hartman return 0; 2025ab4382d2SGreg Kroah-Hartman } 2026ab4382d2SGreg Kroah-Hartman 2027ab4382d2SGreg Kroah-Hartman static inline void 2028ab4382d2SGreg Kroah-Hartman uart_report_port(struct uart_driver *drv, struct uart_port *port) 2029ab4382d2SGreg Kroah-Hartman { 2030ab4382d2SGreg Kroah-Hartman char address[64]; 2031ab4382d2SGreg Kroah-Hartman 2032ab4382d2SGreg Kroah-Hartman switch (port->iotype) { 2033ab4382d2SGreg Kroah-Hartman case UPIO_PORT: 2034ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), "I/O 0x%lx", port->iobase); 2035ab4382d2SGreg Kroah-Hartman break; 2036ab4382d2SGreg Kroah-Hartman case UPIO_HUB6: 2037ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), 2038ab4382d2SGreg Kroah-Hartman "I/O 0x%lx offset 0x%x", port->iobase, port->hub6); 2039ab4382d2SGreg Kroah-Hartman break; 2040ab4382d2SGreg Kroah-Hartman case UPIO_MEM: 2041ab4382d2SGreg Kroah-Hartman case UPIO_MEM32: 2042ab4382d2SGreg Kroah-Hartman case UPIO_AU: 2043ab4382d2SGreg Kroah-Hartman case UPIO_TSI: 2044ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), 2045ab4382d2SGreg Kroah-Hartman "MMIO 0x%llx", (unsigned long long)port->mapbase); 2046ab4382d2SGreg Kroah-Hartman break; 2047ab4382d2SGreg Kroah-Hartman default: 2048ab4382d2SGreg Kroah-Hartman strlcpy(address, "*unknown*", sizeof(address)); 2049ab4382d2SGreg Kroah-Hartman break; 2050ab4382d2SGreg Kroah-Hartman } 2051ab4382d2SGreg Kroah-Hartman 2052ab4382d2SGreg Kroah-Hartman printk(KERN_INFO "%s%s%s%d at %s (irq = %d) is a %s\n", 2053ab4382d2SGreg Kroah-Hartman port->dev ? dev_name(port->dev) : "", 2054ab4382d2SGreg Kroah-Hartman port->dev ? ": " : "", 2055ab4382d2SGreg Kroah-Hartman drv->dev_name, 2056ab4382d2SGreg Kroah-Hartman drv->tty_driver->name_base + port->line, 2057ab4382d2SGreg Kroah-Hartman address, port->irq, uart_type(port)); 2058ab4382d2SGreg Kroah-Hartman } 2059ab4382d2SGreg Kroah-Hartman 2060ab4382d2SGreg Kroah-Hartman static void 2061ab4382d2SGreg Kroah-Hartman uart_configure_port(struct uart_driver *drv, struct uart_state *state, 2062ab4382d2SGreg Kroah-Hartman struct uart_port *port) 2063ab4382d2SGreg Kroah-Hartman { 2064ab4382d2SGreg Kroah-Hartman unsigned int flags; 2065ab4382d2SGreg Kroah-Hartman 2066ab4382d2SGreg Kroah-Hartman /* 2067ab4382d2SGreg Kroah-Hartman * If there isn't a port here, don't do anything further. 2068ab4382d2SGreg Kroah-Hartman */ 2069ab4382d2SGreg Kroah-Hartman if (!port->iobase && !port->mapbase && !port->membase) 2070ab4382d2SGreg Kroah-Hartman return; 2071ab4382d2SGreg Kroah-Hartman 2072ab4382d2SGreg Kroah-Hartman /* 2073ab4382d2SGreg Kroah-Hartman * Now do the auto configuration stuff. Note that config_port 2074ab4382d2SGreg Kroah-Hartman * is expected to claim the resources and map the port for us. 2075ab4382d2SGreg Kroah-Hartman */ 2076ab4382d2SGreg Kroah-Hartman flags = 0; 2077ab4382d2SGreg Kroah-Hartman if (port->flags & UPF_AUTO_IRQ) 2078ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_IRQ; 2079ab4382d2SGreg Kroah-Hartman if (port->flags & UPF_BOOT_AUTOCONF) { 2080ab4382d2SGreg Kroah-Hartman if (!(port->flags & UPF_FIXED_TYPE)) { 2081ab4382d2SGreg Kroah-Hartman port->type = PORT_UNKNOWN; 2082ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_TYPE; 2083ab4382d2SGreg Kroah-Hartman } 2084ab4382d2SGreg Kroah-Hartman port->ops->config_port(port, flags); 2085ab4382d2SGreg Kroah-Hartman } 2086ab4382d2SGreg Kroah-Hartman 2087ab4382d2SGreg Kroah-Hartman if (port->type != PORT_UNKNOWN) { 2088ab4382d2SGreg Kroah-Hartman unsigned long flags; 2089ab4382d2SGreg Kroah-Hartman 2090ab4382d2SGreg Kroah-Hartman uart_report_port(drv, port); 2091ab4382d2SGreg Kroah-Hartman 2092ab4382d2SGreg Kroah-Hartman /* Power up port for set_mctrl() */ 2093ab4382d2SGreg Kroah-Hartman uart_change_pm(state, 0); 2094ab4382d2SGreg Kroah-Hartman 2095ab4382d2SGreg Kroah-Hartman /* 2096ab4382d2SGreg Kroah-Hartman * Ensure that the modem control lines are de-activated. 2097ab4382d2SGreg Kroah-Hartman * keep the DTR setting that is set in uart_set_options() 2098ab4382d2SGreg Kroah-Hartman * We probably don't need a spinlock around this, but 2099ab4382d2SGreg Kroah-Hartman */ 2100ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 2101ab4382d2SGreg Kroah-Hartman port->ops->set_mctrl(port, port->mctrl & TIOCM_DTR); 2102ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 2103ab4382d2SGreg Kroah-Hartman 2104ab4382d2SGreg Kroah-Hartman /* 2105ab4382d2SGreg Kroah-Hartman * If this driver supports console, and it hasn't been 2106ab4382d2SGreg Kroah-Hartman * successfully registered yet, try to re-register it. 2107ab4382d2SGreg Kroah-Hartman * It may be that the port was not available. 2108ab4382d2SGreg Kroah-Hartman */ 2109ab4382d2SGreg Kroah-Hartman if (port->cons && !(port->cons->flags & CON_ENABLED)) 2110ab4382d2SGreg Kroah-Hartman register_console(port->cons); 2111ab4382d2SGreg Kroah-Hartman 2112ab4382d2SGreg Kroah-Hartman /* 2113ab4382d2SGreg Kroah-Hartman * Power down all ports by default, except the 2114ab4382d2SGreg Kroah-Hartman * console if we have one. 2115ab4382d2SGreg Kroah-Hartman */ 2116ab4382d2SGreg Kroah-Hartman if (!uart_console(port)) 2117ab4382d2SGreg Kroah-Hartman uart_change_pm(state, 3); 2118ab4382d2SGreg Kroah-Hartman } 2119ab4382d2SGreg Kroah-Hartman } 2120ab4382d2SGreg Kroah-Hartman 2121ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 2122ab4382d2SGreg Kroah-Hartman 2123ab4382d2SGreg Kroah-Hartman static int uart_poll_init(struct tty_driver *driver, int line, char *options) 2124ab4382d2SGreg Kroah-Hartman { 2125ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2126ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2127ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2128ab4382d2SGreg Kroah-Hartman int baud = 9600; 2129ab4382d2SGreg Kroah-Hartman int bits = 8; 2130ab4382d2SGreg Kroah-Hartman int parity = 'n'; 2131ab4382d2SGreg Kroah-Hartman int flow = 'n'; 2132c7f3e708SAnton Vorontsov int ret; 2133ab4382d2SGreg Kroah-Hartman 2134ab4382d2SGreg Kroah-Hartman if (!state || !state->uart_port) 2135ab4382d2SGreg Kroah-Hartman return -1; 2136ab4382d2SGreg Kroah-Hartman 2137ab4382d2SGreg Kroah-Hartman port = state->uart_port; 2138ab4382d2SGreg Kroah-Hartman if (!(port->ops->poll_get_char && port->ops->poll_put_char)) 2139ab4382d2SGreg Kroah-Hartman return -1; 2140ab4382d2SGreg Kroah-Hartman 2141c7f3e708SAnton Vorontsov if (port->ops->poll_init) { 2142c7f3e708SAnton Vorontsov struct tty_port *tport = &state->port; 2143c7f3e708SAnton Vorontsov 2144c7f3e708SAnton Vorontsov ret = 0; 2145c7f3e708SAnton Vorontsov mutex_lock(&tport->mutex); 2146c7f3e708SAnton Vorontsov /* 2147c7f3e708SAnton Vorontsov * We don't set ASYNCB_INITIALIZED as we only initialized the 2148c7f3e708SAnton Vorontsov * hw, e.g. state->xmit is still uninitialized. 2149c7f3e708SAnton Vorontsov */ 2150c7f3e708SAnton Vorontsov if (!test_bit(ASYNCB_INITIALIZED, &tport->flags)) 2151c7f3e708SAnton Vorontsov ret = port->ops->poll_init(port); 2152c7f3e708SAnton Vorontsov mutex_unlock(&tport->mutex); 2153c7f3e708SAnton Vorontsov if (ret) 2154c7f3e708SAnton Vorontsov return ret; 2155c7f3e708SAnton Vorontsov } 2156c7f3e708SAnton Vorontsov 2157ab4382d2SGreg Kroah-Hartman if (options) { 2158ab4382d2SGreg Kroah-Hartman uart_parse_options(options, &baud, &parity, &bits, &flow); 2159ab4382d2SGreg Kroah-Hartman return uart_set_options(port, NULL, baud, parity, bits, flow); 2160ab4382d2SGreg Kroah-Hartman } 2161ab4382d2SGreg Kroah-Hartman 2162ab4382d2SGreg Kroah-Hartman return 0; 2163ab4382d2SGreg Kroah-Hartman } 2164ab4382d2SGreg Kroah-Hartman 2165ab4382d2SGreg Kroah-Hartman static int uart_poll_get_char(struct tty_driver *driver, int line) 2166ab4382d2SGreg Kroah-Hartman { 2167ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2168ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2169ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2170ab4382d2SGreg Kroah-Hartman 2171ab4382d2SGreg Kroah-Hartman if (!state || !state->uart_port) 2172ab4382d2SGreg Kroah-Hartman return -1; 2173ab4382d2SGreg Kroah-Hartman 2174ab4382d2SGreg Kroah-Hartman port = state->uart_port; 2175ab4382d2SGreg Kroah-Hartman return port->ops->poll_get_char(port); 2176ab4382d2SGreg Kroah-Hartman } 2177ab4382d2SGreg Kroah-Hartman 2178ab4382d2SGreg Kroah-Hartman static void uart_poll_put_char(struct tty_driver *driver, int line, char ch) 2179ab4382d2SGreg Kroah-Hartman { 2180ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2181ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2182ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2183ab4382d2SGreg Kroah-Hartman 2184ab4382d2SGreg Kroah-Hartman if (!state || !state->uart_port) 2185ab4382d2SGreg Kroah-Hartman return; 2186ab4382d2SGreg Kroah-Hartman 2187ab4382d2SGreg Kroah-Hartman port = state->uart_port; 2188ab4382d2SGreg Kroah-Hartman port->ops->poll_put_char(port, ch); 2189ab4382d2SGreg Kroah-Hartman } 2190ab4382d2SGreg Kroah-Hartman #endif 2191ab4382d2SGreg Kroah-Hartman 2192ab4382d2SGreg Kroah-Hartman static const struct tty_operations uart_ops = { 2193ab4382d2SGreg Kroah-Hartman .open = uart_open, 2194ab4382d2SGreg Kroah-Hartman .close = uart_close, 2195ab4382d2SGreg Kroah-Hartman .write = uart_write, 2196ab4382d2SGreg Kroah-Hartman .put_char = uart_put_char, 2197ab4382d2SGreg Kroah-Hartman .flush_chars = uart_flush_chars, 2198ab4382d2SGreg Kroah-Hartman .write_room = uart_write_room, 2199ab4382d2SGreg Kroah-Hartman .chars_in_buffer= uart_chars_in_buffer, 2200ab4382d2SGreg Kroah-Hartman .flush_buffer = uart_flush_buffer, 2201ab4382d2SGreg Kroah-Hartman .ioctl = uart_ioctl, 2202ab4382d2SGreg Kroah-Hartman .throttle = uart_throttle, 2203ab4382d2SGreg Kroah-Hartman .unthrottle = uart_unthrottle, 2204ab4382d2SGreg Kroah-Hartman .send_xchar = uart_send_xchar, 2205ab4382d2SGreg Kroah-Hartman .set_termios = uart_set_termios, 2206ab4382d2SGreg Kroah-Hartman .set_ldisc = uart_set_ldisc, 2207ab4382d2SGreg Kroah-Hartman .stop = uart_stop, 2208ab4382d2SGreg Kroah-Hartman .start = uart_start, 2209ab4382d2SGreg Kroah-Hartman .hangup = uart_hangup, 2210ab4382d2SGreg Kroah-Hartman .break_ctl = uart_break_ctl, 2211ab4382d2SGreg Kroah-Hartman .wait_until_sent= uart_wait_until_sent, 2212ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_PROC_FS 2213ab4382d2SGreg Kroah-Hartman .proc_fops = &uart_proc_fops, 2214ab4382d2SGreg Kroah-Hartman #endif 2215ab4382d2SGreg Kroah-Hartman .tiocmget = uart_tiocmget, 2216ab4382d2SGreg Kroah-Hartman .tiocmset = uart_tiocmset, 2217ab4382d2SGreg Kroah-Hartman .get_icount = uart_get_icount, 2218ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 2219ab4382d2SGreg Kroah-Hartman .poll_init = uart_poll_init, 2220ab4382d2SGreg Kroah-Hartman .poll_get_char = uart_poll_get_char, 2221ab4382d2SGreg Kroah-Hartman .poll_put_char = uart_poll_put_char, 2222ab4382d2SGreg Kroah-Hartman #endif 2223ab4382d2SGreg Kroah-Hartman }; 2224ab4382d2SGreg Kroah-Hartman 2225ab4382d2SGreg Kroah-Hartman static const struct tty_port_operations uart_port_ops = { 22260b1db830SJiri Slaby .activate = uart_port_activate, 22270b1db830SJiri Slaby .shutdown = uart_port_shutdown, 2228ab4382d2SGreg Kroah-Hartman .carrier_raised = uart_carrier_raised, 2229ab4382d2SGreg Kroah-Hartman .dtr_rts = uart_dtr_rts, 2230ab4382d2SGreg Kroah-Hartman }; 2231ab4382d2SGreg Kroah-Hartman 2232ab4382d2SGreg Kroah-Hartman /** 2233ab4382d2SGreg Kroah-Hartman * uart_register_driver - register a driver with the uart core layer 2234ab4382d2SGreg Kroah-Hartman * @drv: low level driver structure 2235ab4382d2SGreg Kroah-Hartman * 2236ab4382d2SGreg Kroah-Hartman * Register a uart driver with the core driver. We in turn register 2237ab4382d2SGreg Kroah-Hartman * with the tty layer, and initialise the core driver per-port state. 2238ab4382d2SGreg Kroah-Hartman * 2239ab4382d2SGreg Kroah-Hartman * We have a proc file in /proc/tty/driver which is named after the 2240ab4382d2SGreg Kroah-Hartman * normal driver. 2241ab4382d2SGreg Kroah-Hartman * 2242ab4382d2SGreg Kroah-Hartman * drv->port should be NULL, and the per-port structures should be 2243ab4382d2SGreg Kroah-Hartman * registered using uart_add_one_port after this call has succeeded. 2244ab4382d2SGreg Kroah-Hartman */ 2245ab4382d2SGreg Kroah-Hartman int uart_register_driver(struct uart_driver *drv) 2246ab4382d2SGreg Kroah-Hartman { 2247ab4382d2SGreg Kroah-Hartman struct tty_driver *normal; 2248ab4382d2SGreg Kroah-Hartman int i, retval; 2249ab4382d2SGreg Kroah-Hartman 2250ab4382d2SGreg Kroah-Hartman BUG_ON(drv->state); 2251ab4382d2SGreg Kroah-Hartman 2252ab4382d2SGreg Kroah-Hartman /* 2253ab4382d2SGreg Kroah-Hartman * Maybe we should be using a slab cache for this, especially if 2254ab4382d2SGreg Kroah-Hartman * we have a large number of ports to handle. 2255ab4382d2SGreg Kroah-Hartman */ 2256ab4382d2SGreg Kroah-Hartman drv->state = kzalloc(sizeof(struct uart_state) * drv->nr, GFP_KERNEL); 2257ab4382d2SGreg Kroah-Hartman if (!drv->state) 2258ab4382d2SGreg Kroah-Hartman goto out; 2259ab4382d2SGreg Kroah-Hartman 2260ab4382d2SGreg Kroah-Hartman normal = alloc_tty_driver(drv->nr); 2261ab4382d2SGreg Kroah-Hartman if (!normal) 2262ab4382d2SGreg Kroah-Hartman goto out_kfree; 2263ab4382d2SGreg Kroah-Hartman 2264ab4382d2SGreg Kroah-Hartman drv->tty_driver = normal; 2265ab4382d2SGreg Kroah-Hartman 2266ab4382d2SGreg Kroah-Hartman normal->driver_name = drv->driver_name; 2267ab4382d2SGreg Kroah-Hartman normal->name = drv->dev_name; 2268ab4382d2SGreg Kroah-Hartman normal->major = drv->major; 2269ab4382d2SGreg Kroah-Hartman normal->minor_start = drv->minor; 2270ab4382d2SGreg Kroah-Hartman normal->type = TTY_DRIVER_TYPE_SERIAL; 2271ab4382d2SGreg Kroah-Hartman normal->subtype = SERIAL_TYPE_NORMAL; 2272ab4382d2SGreg Kroah-Hartman normal->init_termios = tty_std_termios; 2273ab4382d2SGreg Kroah-Hartman normal->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; 2274ab4382d2SGreg Kroah-Hartman normal->init_termios.c_ispeed = normal->init_termios.c_ospeed = 9600; 2275ab4382d2SGreg Kroah-Hartman normal->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; 2276ab4382d2SGreg Kroah-Hartman normal->driver_state = drv; 2277ab4382d2SGreg Kroah-Hartman tty_set_operations(normal, &uart_ops); 2278ab4382d2SGreg Kroah-Hartman 2279ab4382d2SGreg Kroah-Hartman /* 2280ab4382d2SGreg Kroah-Hartman * Initialise the UART state(s). 2281ab4382d2SGreg Kroah-Hartman */ 2282ab4382d2SGreg Kroah-Hartman for (i = 0; i < drv->nr; i++) { 2283ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + i; 2284ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2285ab4382d2SGreg Kroah-Hartman 2286ab4382d2SGreg Kroah-Hartman tty_port_init(port); 2287ab4382d2SGreg Kroah-Hartman port->ops = &uart_port_ops; 22884cb0fbfdSJiri Slaby port->close_delay = HZ / 2; /* .5 seconds */ 22894cb0fbfdSJiri Slaby port->closing_wait = 30 * HZ;/* 30 seconds */ 2290ab4382d2SGreg Kroah-Hartman } 2291ab4382d2SGreg Kroah-Hartman 2292ab4382d2SGreg Kroah-Hartman retval = tty_register_driver(normal); 2293ab4382d2SGreg Kroah-Hartman if (retval >= 0) 2294ab4382d2SGreg Kroah-Hartman return retval; 2295ab4382d2SGreg Kroah-Hartman 2296ab4382d2SGreg Kroah-Hartman put_tty_driver(normal); 2297ab4382d2SGreg Kroah-Hartman out_kfree: 2298ab4382d2SGreg Kroah-Hartman kfree(drv->state); 2299ab4382d2SGreg Kroah-Hartman out: 2300ab4382d2SGreg Kroah-Hartman return -ENOMEM; 2301ab4382d2SGreg Kroah-Hartman } 2302ab4382d2SGreg Kroah-Hartman 2303ab4382d2SGreg Kroah-Hartman /** 2304ab4382d2SGreg Kroah-Hartman * uart_unregister_driver - remove a driver from the uart core layer 2305ab4382d2SGreg Kroah-Hartman * @drv: low level driver structure 2306ab4382d2SGreg Kroah-Hartman * 2307ab4382d2SGreg Kroah-Hartman * Remove all references to a driver from the core driver. The low 2308ab4382d2SGreg Kroah-Hartman * level driver must have removed all its ports via the 2309ab4382d2SGreg Kroah-Hartman * uart_remove_one_port() if it registered them with uart_add_one_port(). 2310ab4382d2SGreg Kroah-Hartman * (ie, drv->port == NULL) 2311ab4382d2SGreg Kroah-Hartman */ 2312ab4382d2SGreg Kroah-Hartman void uart_unregister_driver(struct uart_driver *drv) 2313ab4382d2SGreg Kroah-Hartman { 2314ab4382d2SGreg Kroah-Hartman struct tty_driver *p = drv->tty_driver; 2315ab4382d2SGreg Kroah-Hartman tty_unregister_driver(p); 2316ab4382d2SGreg Kroah-Hartman put_tty_driver(p); 2317ab4382d2SGreg Kroah-Hartman kfree(drv->state); 23181e66cdedSAlan Cox drv->state = NULL; 2319ab4382d2SGreg Kroah-Hartman drv->tty_driver = NULL; 2320ab4382d2SGreg Kroah-Hartman } 2321ab4382d2SGreg Kroah-Hartman 2322ab4382d2SGreg Kroah-Hartman struct tty_driver *uart_console_device(struct console *co, int *index) 2323ab4382d2SGreg Kroah-Hartman { 2324ab4382d2SGreg Kroah-Hartman struct uart_driver *p = co->data; 2325ab4382d2SGreg Kroah-Hartman *index = co->index; 2326ab4382d2SGreg Kroah-Hartman return p->tty_driver; 2327ab4382d2SGreg Kroah-Hartman } 2328ab4382d2SGreg Kroah-Hartman 23296915c0e4STomas Hlavacek static ssize_t uart_get_attr_uartclk(struct device *dev, 23306915c0e4STomas Hlavacek struct device_attribute *attr, char *buf) 23316915c0e4STomas Hlavacek { 2332bebe73e3SAlan Cox struct serial_struct tmp; 23336915c0e4STomas Hlavacek struct tty_port *port = dev_get_drvdata(dev); 23346915c0e4STomas Hlavacek struct uart_state *state = container_of(port, struct uart_state, port); 2335b1b79916STomas Hlavacek 2336bebe73e3SAlan Cox mutex_lock(&port->mutex); 2337bebe73e3SAlan Cox uart_get_info(port, state, &tmp); 2338bebe73e3SAlan Cox mutex_unlock(&port->mutex); 23396915c0e4STomas Hlavacek 2340bebe73e3SAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.baud_base * 16); 23416915c0e4STomas Hlavacek } 23426915c0e4STomas Hlavacek 23436915c0e4STomas Hlavacek static DEVICE_ATTR(uartclk, S_IRUSR | S_IRGRP, uart_get_attr_uartclk, NULL); 23446915c0e4STomas Hlavacek 23456915c0e4STomas Hlavacek static struct attribute *tty_dev_attrs[] = { 23466915c0e4STomas Hlavacek &dev_attr_uartclk.attr, 23476915c0e4STomas Hlavacek NULL, 23486915c0e4STomas Hlavacek }; 23496915c0e4STomas Hlavacek 2350b1b79916STomas Hlavacek static const struct attribute_group tty_dev_attr_group = { 23516915c0e4STomas Hlavacek .attrs = tty_dev_attrs, 23526915c0e4STomas Hlavacek }; 23536915c0e4STomas Hlavacek 23546915c0e4STomas Hlavacek static const struct attribute_group *tty_dev_attr_groups[] = { 23556915c0e4STomas Hlavacek &tty_dev_attr_group, 23566915c0e4STomas Hlavacek NULL 23576915c0e4STomas Hlavacek }; 23586915c0e4STomas Hlavacek 2359ab4382d2SGreg Kroah-Hartman /** 2360ab4382d2SGreg Kroah-Hartman * uart_add_one_port - attach a driver-defined port structure 2361ab4382d2SGreg Kroah-Hartman * @drv: pointer to the uart low level driver structure for this port 2362ab4382d2SGreg Kroah-Hartman * @uport: uart port structure to use for this port. 2363ab4382d2SGreg Kroah-Hartman * 2364ab4382d2SGreg Kroah-Hartman * This allows the driver to register its own uart_port structure 2365ab4382d2SGreg Kroah-Hartman * with the core driver. The main purpose is to allow the low 2366ab4382d2SGreg Kroah-Hartman * level uart drivers to expand uart_port, rather than having yet 2367ab4382d2SGreg Kroah-Hartman * more levels of structures. 2368ab4382d2SGreg Kroah-Hartman */ 2369ab4382d2SGreg Kroah-Hartman int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport) 2370ab4382d2SGreg Kroah-Hartman { 2371ab4382d2SGreg Kroah-Hartman struct uart_state *state; 2372ab4382d2SGreg Kroah-Hartman struct tty_port *port; 2373ab4382d2SGreg Kroah-Hartman int ret = 0; 2374ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 2375ab4382d2SGreg Kroah-Hartman 2376ab4382d2SGreg Kroah-Hartman BUG_ON(in_interrupt()); 2377ab4382d2SGreg Kroah-Hartman 2378ab4382d2SGreg Kroah-Hartman if (uport->line >= drv->nr) 2379ab4382d2SGreg Kroah-Hartman return -EINVAL; 2380ab4382d2SGreg Kroah-Hartman 2381ab4382d2SGreg Kroah-Hartman state = drv->state + uport->line; 2382ab4382d2SGreg Kroah-Hartman port = &state->port; 2383ab4382d2SGreg Kroah-Hartman 2384ab4382d2SGreg Kroah-Hartman mutex_lock(&port_mutex); 2385ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2386ab4382d2SGreg Kroah-Hartman if (state->uart_port) { 2387ab4382d2SGreg Kroah-Hartman ret = -EINVAL; 2388ab4382d2SGreg Kroah-Hartman goto out; 2389ab4382d2SGreg Kroah-Hartman } 2390ab4382d2SGreg Kroah-Hartman 2391ab4382d2SGreg Kroah-Hartman state->uart_port = uport; 2392ab4382d2SGreg Kroah-Hartman state->pm_state = -1; 2393ab4382d2SGreg Kroah-Hartman 2394ab4382d2SGreg Kroah-Hartman uport->cons = drv->cons; 2395ab4382d2SGreg Kroah-Hartman uport->state = state; 2396ab4382d2SGreg Kroah-Hartman 2397ab4382d2SGreg Kroah-Hartman /* 2398ab4382d2SGreg Kroah-Hartman * If this port is a console, then the spinlock is already 2399ab4382d2SGreg Kroah-Hartman * initialised. 2400ab4382d2SGreg Kroah-Hartman */ 2401ab4382d2SGreg Kroah-Hartman if (!(uart_console(uport) && (uport->cons->flags & CON_ENABLED))) { 2402ab4382d2SGreg Kroah-Hartman spin_lock_init(&uport->lock); 2403ab4382d2SGreg Kroah-Hartman lockdep_set_class(&uport->lock, &port_lock_key); 2404ab4382d2SGreg Kroah-Hartman } 2405ab4382d2SGreg Kroah-Hartman 2406ab4382d2SGreg Kroah-Hartman uart_configure_port(drv, state, uport); 2407ab4382d2SGreg Kroah-Hartman 2408ab4382d2SGreg Kroah-Hartman /* 2409ab4382d2SGreg Kroah-Hartman * Register the port whether it's detected or not. This allows 2410ab4382d2SGreg Kroah-Hartman * setserial to be used to alter this ports parameters. 2411ab4382d2SGreg Kroah-Hartman */ 2412b1b79916STomas Hlavacek tty_dev = tty_port_register_device_attr(port, drv->tty_driver, 2413b1b79916STomas Hlavacek uport->line, uport->dev, port, tty_dev_attr_groups); 2414ab4382d2SGreg Kroah-Hartman if (likely(!IS_ERR(tty_dev))) { 241577359835SSimon Glass device_set_wakeup_capable(tty_dev, 1); 241677359835SSimon Glass } else { 2417ab4382d2SGreg Kroah-Hartman printk(KERN_ERR "Cannot register tty device on line %d\n", 2418ab4382d2SGreg Kroah-Hartman uport->line); 241977359835SSimon Glass } 2420ab4382d2SGreg Kroah-Hartman 2421ab4382d2SGreg Kroah-Hartman /* 2422ab4382d2SGreg Kroah-Hartman * Ensure UPF_DEAD is not set. 2423ab4382d2SGreg Kroah-Hartman */ 2424ab4382d2SGreg Kroah-Hartman uport->flags &= ~UPF_DEAD; 2425ab4382d2SGreg Kroah-Hartman 2426ab4382d2SGreg Kroah-Hartman out: 2427ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2428ab4382d2SGreg Kroah-Hartman mutex_unlock(&port_mutex); 2429ab4382d2SGreg Kroah-Hartman 2430ab4382d2SGreg Kroah-Hartman return ret; 2431ab4382d2SGreg Kroah-Hartman } 2432ab4382d2SGreg Kroah-Hartman 2433ab4382d2SGreg Kroah-Hartman /** 2434ab4382d2SGreg Kroah-Hartman * uart_remove_one_port - detach a driver defined port structure 2435ab4382d2SGreg Kroah-Hartman * @drv: pointer to the uart low level driver structure for this port 2436ab4382d2SGreg Kroah-Hartman * @uport: uart port structure for this port 2437ab4382d2SGreg Kroah-Hartman * 2438ab4382d2SGreg Kroah-Hartman * This unhooks (and hangs up) the specified port structure from the 2439ab4382d2SGreg Kroah-Hartman * core driver. No further calls will be made to the low-level code 2440ab4382d2SGreg Kroah-Hartman * for this port. 2441ab4382d2SGreg Kroah-Hartman */ 2442ab4382d2SGreg Kroah-Hartman int uart_remove_one_port(struct uart_driver *drv, struct uart_port *uport) 2443ab4382d2SGreg Kroah-Hartman { 2444ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 2445ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2446ab4382d2SGreg Kroah-Hartman 2447ab4382d2SGreg Kroah-Hartman BUG_ON(in_interrupt()); 2448ab4382d2SGreg Kroah-Hartman 2449ab4382d2SGreg Kroah-Hartman if (state->uart_port != uport) 2450ab4382d2SGreg Kroah-Hartman printk(KERN_ALERT "Removing wrong port: %p != %p\n", 2451ab4382d2SGreg Kroah-Hartman state->uart_port, uport); 2452ab4382d2SGreg Kroah-Hartman 2453ab4382d2SGreg Kroah-Hartman mutex_lock(&port_mutex); 2454ab4382d2SGreg Kroah-Hartman 2455ab4382d2SGreg Kroah-Hartman /* 2456ab4382d2SGreg Kroah-Hartman * Mark the port "dead" - this prevents any opens from 2457ab4382d2SGreg Kroah-Hartman * succeeding while we shut down the port. 2458ab4382d2SGreg Kroah-Hartman */ 2459ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2460ab4382d2SGreg Kroah-Hartman uport->flags |= UPF_DEAD; 2461ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2462ab4382d2SGreg Kroah-Hartman 2463ab4382d2SGreg Kroah-Hartman /* 2464ab4382d2SGreg Kroah-Hartman * Remove the devices from the tty layer 2465ab4382d2SGreg Kroah-Hartman */ 2466ab4382d2SGreg Kroah-Hartman tty_unregister_device(drv->tty_driver, uport->line); 2467ab4382d2SGreg Kroah-Hartman 2468ab4382d2SGreg Kroah-Hartman if (port->tty) 2469ab4382d2SGreg Kroah-Hartman tty_vhangup(port->tty); 2470ab4382d2SGreg Kroah-Hartman 2471ab4382d2SGreg Kroah-Hartman /* 2472ab4382d2SGreg Kroah-Hartman * Free the port IO and memory resources, if any. 2473ab4382d2SGreg Kroah-Hartman */ 2474ab4382d2SGreg Kroah-Hartman if (uport->type != PORT_UNKNOWN) 2475ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 2476ab4382d2SGreg Kroah-Hartman 2477ab4382d2SGreg Kroah-Hartman /* 2478ab4382d2SGreg Kroah-Hartman * Indicate that there isn't a port here anymore. 2479ab4382d2SGreg Kroah-Hartman */ 2480ab4382d2SGreg Kroah-Hartman uport->type = PORT_UNKNOWN; 2481ab4382d2SGreg Kroah-Hartman 2482ab4382d2SGreg Kroah-Hartman state->uart_port = NULL; 2483ab4382d2SGreg Kroah-Hartman mutex_unlock(&port_mutex); 2484ab4382d2SGreg Kroah-Hartman 2485ab4382d2SGreg Kroah-Hartman return 0; 2486ab4382d2SGreg Kroah-Hartman } 2487ab4382d2SGreg Kroah-Hartman 2488ab4382d2SGreg Kroah-Hartman /* 2489ab4382d2SGreg Kroah-Hartman * Are the two ports equivalent? 2490ab4382d2SGreg Kroah-Hartman */ 2491ab4382d2SGreg Kroah-Hartman int uart_match_port(struct uart_port *port1, struct uart_port *port2) 2492ab4382d2SGreg Kroah-Hartman { 2493ab4382d2SGreg Kroah-Hartman if (port1->iotype != port2->iotype) 2494ab4382d2SGreg Kroah-Hartman return 0; 2495ab4382d2SGreg Kroah-Hartman 2496ab4382d2SGreg Kroah-Hartman switch (port1->iotype) { 2497ab4382d2SGreg Kroah-Hartman case UPIO_PORT: 2498ab4382d2SGreg Kroah-Hartman return (port1->iobase == port2->iobase); 2499ab4382d2SGreg Kroah-Hartman case UPIO_HUB6: 2500ab4382d2SGreg Kroah-Hartman return (port1->iobase == port2->iobase) && 2501ab4382d2SGreg Kroah-Hartman (port1->hub6 == port2->hub6); 2502ab4382d2SGreg Kroah-Hartman case UPIO_MEM: 2503ab4382d2SGreg Kroah-Hartman case UPIO_MEM32: 2504ab4382d2SGreg Kroah-Hartman case UPIO_AU: 2505ab4382d2SGreg Kroah-Hartman case UPIO_TSI: 2506ab4382d2SGreg Kroah-Hartman return (port1->mapbase == port2->mapbase); 2507ab4382d2SGreg Kroah-Hartman } 2508ab4382d2SGreg Kroah-Hartman return 0; 2509ab4382d2SGreg Kroah-Hartman } 2510ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_match_port); 2511ab4382d2SGreg Kroah-Hartman 2512027d7dacSJiri Slaby /** 2513027d7dacSJiri Slaby * uart_handle_dcd_change - handle a change of carrier detect state 2514027d7dacSJiri Slaby * @uport: uart_port structure for the open port 2515027d7dacSJiri Slaby * @status: new carrier detect status, nonzero if active 2516027d7dacSJiri Slaby */ 2517027d7dacSJiri Slaby void uart_handle_dcd_change(struct uart_port *uport, unsigned int status) 2518027d7dacSJiri Slaby { 2519027d7dacSJiri Slaby struct uart_state *state = uport->state; 2520027d7dacSJiri Slaby struct tty_port *port = &state->port; 252143eca0aeSAlan Cox struct tty_ldisc *ld = NULL; 2522027d7dacSJiri Slaby struct pps_event_time ts; 252343eca0aeSAlan Cox struct tty_struct *tty = port->tty; 2524027d7dacSJiri Slaby 252543eca0aeSAlan Cox if (tty) 252643eca0aeSAlan Cox ld = tty_ldisc_ref(tty); 2527027d7dacSJiri Slaby if (ld && ld->ops->dcd_change) 2528027d7dacSJiri Slaby pps_get_ts(&ts); 2529027d7dacSJiri Slaby 2530027d7dacSJiri Slaby uport->icount.dcd++; 2531027d7dacSJiri Slaby #ifdef CONFIG_HARD_PPS 2532027d7dacSJiri Slaby if ((uport->flags & UPF_HARDPPS_CD) && status) 2533027d7dacSJiri Slaby hardpps(); 2534027d7dacSJiri Slaby #endif 2535027d7dacSJiri Slaby 2536027d7dacSJiri Slaby if (port->flags & ASYNC_CHECK_CD) { 2537027d7dacSJiri Slaby if (status) 2538027d7dacSJiri Slaby wake_up_interruptible(&port->open_wait); 253943eca0aeSAlan Cox else if (tty) 254043eca0aeSAlan Cox tty_hangup(tty); 2541027d7dacSJiri Slaby } 2542027d7dacSJiri Slaby 2543027d7dacSJiri Slaby if (ld && ld->ops->dcd_change) 254443eca0aeSAlan Cox ld->ops->dcd_change(tty, status, &ts); 2545027d7dacSJiri Slaby if (ld) 2546027d7dacSJiri Slaby tty_ldisc_deref(ld); 2547027d7dacSJiri Slaby } 2548027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_handle_dcd_change); 2549027d7dacSJiri Slaby 2550027d7dacSJiri Slaby /** 2551027d7dacSJiri Slaby * uart_handle_cts_change - handle a change of clear-to-send state 2552027d7dacSJiri Slaby * @uport: uart_port structure for the open port 2553027d7dacSJiri Slaby * @status: new clear to send status, nonzero if active 2554027d7dacSJiri Slaby */ 2555027d7dacSJiri Slaby void uart_handle_cts_change(struct uart_port *uport, unsigned int status) 2556027d7dacSJiri Slaby { 2557027d7dacSJiri Slaby struct tty_port *port = &uport->state->port; 2558027d7dacSJiri Slaby struct tty_struct *tty = port->tty; 2559027d7dacSJiri Slaby 2560027d7dacSJiri Slaby uport->icount.cts++; 2561027d7dacSJiri Slaby 2562f21ec3d2SHuang Shijie if (tty_port_cts_enabled(port)) { 2563027d7dacSJiri Slaby if (tty->hw_stopped) { 2564027d7dacSJiri Slaby if (status) { 2565027d7dacSJiri Slaby tty->hw_stopped = 0; 2566027d7dacSJiri Slaby uport->ops->start_tx(uport); 2567027d7dacSJiri Slaby uart_write_wakeup(uport); 2568027d7dacSJiri Slaby } 2569027d7dacSJiri Slaby } else { 2570027d7dacSJiri Slaby if (!status) { 2571027d7dacSJiri Slaby tty->hw_stopped = 1; 2572027d7dacSJiri Slaby uport->ops->stop_tx(uport); 2573027d7dacSJiri Slaby } 2574027d7dacSJiri Slaby } 2575027d7dacSJiri Slaby } 2576027d7dacSJiri Slaby } 2577027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_handle_cts_change); 2578027d7dacSJiri Slaby 2579cf75525fSJiri Slaby /** 2580cf75525fSJiri Slaby * uart_insert_char - push a char to the uart layer 2581cf75525fSJiri Slaby * 2582cf75525fSJiri Slaby * User is responsible to call tty_flip_buffer_push when they are done with 2583cf75525fSJiri Slaby * insertion. 2584cf75525fSJiri Slaby * 2585cf75525fSJiri Slaby * @port: corresponding port 2586cf75525fSJiri Slaby * @status: state of the serial port RX buffer (LSR for 8250) 2587cf75525fSJiri Slaby * @overrun: mask of overrun bits in @status 2588cf75525fSJiri Slaby * @ch: character to push 2589cf75525fSJiri Slaby * @flag: flag for the character (see TTY_NORMAL and friends) 2590cf75525fSJiri Slaby */ 2591027d7dacSJiri Slaby void uart_insert_char(struct uart_port *port, unsigned int status, 2592027d7dacSJiri Slaby unsigned int overrun, unsigned int ch, unsigned int flag) 2593027d7dacSJiri Slaby { 2594027d7dacSJiri Slaby struct tty_struct *tty = port->state->port.tty; 2595027d7dacSJiri Slaby 2596027d7dacSJiri Slaby if ((status & port->ignore_status_mask & ~overrun) == 0) 2597dabfb351SCorbin if (tty_insert_flip_char(tty, ch, flag) == 0) 2598dabfb351SCorbin ++port->icount.buf_overrun; 2599027d7dacSJiri Slaby 2600027d7dacSJiri Slaby /* 2601027d7dacSJiri Slaby * Overrun is special. Since it's reported immediately, 2602027d7dacSJiri Slaby * it doesn't affect the current character. 2603027d7dacSJiri Slaby */ 2604027d7dacSJiri Slaby if (status & ~port->ignore_status_mask & overrun) 2605dabfb351SCorbin if (tty_insert_flip_char(tty, 0, TTY_OVERRUN) == 0) 2606dabfb351SCorbin ++port->icount.buf_overrun; 2607027d7dacSJiri Slaby } 2608027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_insert_char); 2609027d7dacSJiri Slaby 2610ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_write_wakeup); 2611ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_register_driver); 2612ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_unregister_driver); 2613ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_suspend_port); 2614ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_resume_port); 2615ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_add_one_port); 2616ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_remove_one_port); 2617ab4382d2SGreg Kroah-Hartman 2618ab4382d2SGreg Kroah-Hartman MODULE_DESCRIPTION("Serial driver core"); 2619ab4382d2SGreg Kroah-Hartman MODULE_LICENSE("GPL"); 2620