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 static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, 54ab4382d2SGreg Kroah-Hartman struct ktermios *old_termios); 551f33a51dSJiri Slaby static void uart_wait_until_sent(struct tty_struct *tty, int timeout); 566f538fe3SLinus Walleij static void uart_change_pm(struct uart_state *state, 576f538fe3SLinus Walleij enum uart_pm_state pm_state); 58ab4382d2SGreg Kroah-Hartman 59b922e19dSJiri Slaby static void uart_port_shutdown(struct tty_port *port); 60b922e19dSJiri Slaby 61ab4382d2SGreg Kroah-Hartman /* 62ab4382d2SGreg Kroah-Hartman * This routine is used by the interrupt handler to schedule processing in 63ab4382d2SGreg Kroah-Hartman * the software interrupt portion of the driver. 64ab4382d2SGreg Kroah-Hartman */ 65ab4382d2SGreg Kroah-Hartman void uart_write_wakeup(struct uart_port *port) 66ab4382d2SGreg Kroah-Hartman { 67ab4382d2SGreg Kroah-Hartman struct uart_state *state = port->state; 68ab4382d2SGreg Kroah-Hartman /* 69ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 70ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 71ab4382d2SGreg Kroah-Hartman */ 72ab4382d2SGreg Kroah-Hartman BUG_ON(!state); 736a3e492bSJiri Slaby tty_wakeup(state->port.tty); 74ab4382d2SGreg Kroah-Hartman } 75ab4382d2SGreg Kroah-Hartman 76ab4382d2SGreg Kroah-Hartman static void uart_stop(struct tty_struct *tty) 77ab4382d2SGreg Kroah-Hartman { 78ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 79ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 80ab4382d2SGreg Kroah-Hartman unsigned long flags; 81ab4382d2SGreg Kroah-Hartman 82ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 83ab4382d2SGreg Kroah-Hartman port->ops->stop_tx(port); 84ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 85ab4382d2SGreg Kroah-Hartman } 86ab4382d2SGreg Kroah-Hartman 87ab4382d2SGreg Kroah-Hartman static void __uart_start(struct tty_struct *tty) 88ab4382d2SGreg Kroah-Hartman { 89ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 90ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 91ab4382d2SGreg Kroah-Hartman 92ab4382d2SGreg Kroah-Hartman if (!uart_circ_empty(&state->xmit) && state->xmit.buf && 93ab4382d2SGreg Kroah-Hartman !tty->stopped && !tty->hw_stopped) 94ab4382d2SGreg Kroah-Hartman port->ops->start_tx(port); 95ab4382d2SGreg Kroah-Hartman } 96ab4382d2SGreg Kroah-Hartman 97ab4382d2SGreg Kroah-Hartman static void uart_start(struct tty_struct *tty) 98ab4382d2SGreg Kroah-Hartman { 99ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 100ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 101ab4382d2SGreg Kroah-Hartman unsigned long flags; 102ab4382d2SGreg Kroah-Hartman 103ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 104ab4382d2SGreg Kroah-Hartman __uart_start(tty); 105ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 106ab4382d2SGreg Kroah-Hartman } 107ab4382d2SGreg Kroah-Hartman 108ab4382d2SGreg Kroah-Hartman static inline void 109ab4382d2SGreg Kroah-Hartman uart_update_mctrl(struct uart_port *port, unsigned int set, unsigned int clear) 110ab4382d2SGreg Kroah-Hartman { 111ab4382d2SGreg Kroah-Hartman unsigned long flags; 112ab4382d2SGreg Kroah-Hartman unsigned int old; 113ab4382d2SGreg Kroah-Hartman 114ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 115ab4382d2SGreg Kroah-Hartman old = port->mctrl; 116ab4382d2SGreg Kroah-Hartman port->mctrl = (old & ~clear) | set; 117ab4382d2SGreg Kroah-Hartman if (old != port->mctrl) 118ab4382d2SGreg Kroah-Hartman port->ops->set_mctrl(port, port->mctrl); 119ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 120ab4382d2SGreg Kroah-Hartman } 121ab4382d2SGreg Kroah-Hartman 122ab4382d2SGreg Kroah-Hartman #define uart_set_mctrl(port, set) uart_update_mctrl(port, set, 0) 123ab4382d2SGreg Kroah-Hartman #define uart_clear_mctrl(port, clear) uart_update_mctrl(port, 0, clear) 124ab4382d2SGreg Kroah-Hartman 125ab4382d2SGreg Kroah-Hartman /* 126ab4382d2SGreg Kroah-Hartman * Startup the port. This will be called once per open. All calls 127ab4382d2SGreg Kroah-Hartman * will be serialised by the per-port mutex. 128ab4382d2SGreg Kroah-Hartman */ 129c0d92be6SJiri Slaby static int uart_port_startup(struct tty_struct *tty, struct uart_state *state, 130c0d92be6SJiri Slaby int init_hw) 131ab4382d2SGreg Kroah-Hartman { 132ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 133ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 134ab4382d2SGreg Kroah-Hartman unsigned long page; 135ab4382d2SGreg Kroah-Hartman int retval = 0; 136ab4382d2SGreg Kroah-Hartman 137ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) 138c0d92be6SJiri Slaby return 1; 139ab4382d2SGreg Kroah-Hartman 140ab4382d2SGreg Kroah-Hartman /* 141ab4382d2SGreg Kroah-Hartman * Initialise and allocate the transmit and temporary 142ab4382d2SGreg Kroah-Hartman * buffer. 143ab4382d2SGreg Kroah-Hartman */ 144ab4382d2SGreg Kroah-Hartman if (!state->xmit.buf) { 145ab4382d2SGreg Kroah-Hartman /* This is protected by the per port mutex */ 146ab4382d2SGreg Kroah-Hartman page = get_zeroed_page(GFP_KERNEL); 147ab4382d2SGreg Kroah-Hartman if (!page) 148ab4382d2SGreg Kroah-Hartman return -ENOMEM; 149ab4382d2SGreg Kroah-Hartman 150ab4382d2SGreg Kroah-Hartman state->xmit.buf = (unsigned char *) page; 151ab4382d2SGreg Kroah-Hartman uart_circ_clear(&state->xmit); 152ab4382d2SGreg Kroah-Hartman } 153ab4382d2SGreg Kroah-Hartman 154ab4382d2SGreg Kroah-Hartman retval = uport->ops->startup(uport); 155ab4382d2SGreg Kroah-Hartman if (retval == 0) { 156c7d7abffSJiri Slaby if (uart_console(uport) && uport->cons->cflag) { 157adc8d746SAlan Cox tty->termios.c_cflag = uport->cons->cflag; 158c7d7abffSJiri Slaby uport->cons->cflag = 0; 159c7d7abffSJiri Slaby } 160ab4382d2SGreg Kroah-Hartman /* 161ab4382d2SGreg Kroah-Hartman * Initialise the hardware port settings. 162ab4382d2SGreg Kroah-Hartman */ 163ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 164ab4382d2SGreg Kroah-Hartman 165c7d7abffSJiri Slaby if (init_hw) { 166ab4382d2SGreg Kroah-Hartman /* 167ab4382d2SGreg Kroah-Hartman * Setup the RTS and DTR signals once the 168ab4382d2SGreg Kroah-Hartman * port is open and ready to respond. 169ab4382d2SGreg Kroah-Hartman */ 170adc8d746SAlan Cox if (tty->termios.c_cflag & CBAUD) 171ab4382d2SGreg Kroah-Hartman uart_set_mctrl(uport, TIOCM_RTS | TIOCM_DTR); 172ab4382d2SGreg Kroah-Hartman } 173ab4382d2SGreg Kroah-Hartman 174f21ec3d2SHuang Shijie if (tty_port_cts_enabled(port)) { 175ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 176ab4382d2SGreg Kroah-Hartman if (!(uport->ops->get_mctrl(uport) & TIOCM_CTS)) 177ab4382d2SGreg Kroah-Hartman tty->hw_stopped = 1; 178ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 179ab4382d2SGreg Kroah-Hartman } 180ab4382d2SGreg Kroah-Hartman } 181ab4382d2SGreg Kroah-Hartman 1820055197eSJiri Slaby /* 1830055197eSJiri Slaby * This is to allow setserial on this port. People may want to set 1840055197eSJiri Slaby * port/irq/type and then reconfigure the port properly if it failed 1850055197eSJiri Slaby * now. 1860055197eSJiri Slaby */ 187ab4382d2SGreg Kroah-Hartman if (retval && capable(CAP_SYS_ADMIN)) 188c0d92be6SJiri Slaby return 1; 189c0d92be6SJiri Slaby 190c0d92be6SJiri Slaby return retval; 191c0d92be6SJiri Slaby } 192c0d92be6SJiri Slaby 193c0d92be6SJiri Slaby static int uart_startup(struct tty_struct *tty, struct uart_state *state, 194c0d92be6SJiri Slaby int init_hw) 195c0d92be6SJiri Slaby { 196c0d92be6SJiri Slaby struct tty_port *port = &state->port; 197c0d92be6SJiri Slaby int retval; 198c0d92be6SJiri Slaby 199c0d92be6SJiri Slaby if (port->flags & ASYNC_INITIALIZED) 200c0d92be6SJiri Slaby return 0; 201c0d92be6SJiri Slaby 202c0d92be6SJiri Slaby /* 203c0d92be6SJiri Slaby * Set the TTY IO error marker - we will only clear this 204c0d92be6SJiri Slaby * once we have successfully opened the port. 205c0d92be6SJiri Slaby */ 206c0d92be6SJiri Slaby set_bit(TTY_IO_ERROR, &tty->flags); 207c0d92be6SJiri Slaby 208c0d92be6SJiri Slaby retval = uart_port_startup(tty, state, init_hw); 209c0d92be6SJiri Slaby if (!retval) { 210c0d92be6SJiri Slaby set_bit(ASYNCB_INITIALIZED, &port->flags); 211c0d92be6SJiri Slaby clear_bit(TTY_IO_ERROR, &tty->flags); 212c0d92be6SJiri Slaby } else if (retval > 0) 213ab4382d2SGreg Kroah-Hartman retval = 0; 214ab4382d2SGreg Kroah-Hartman 215ab4382d2SGreg Kroah-Hartman return retval; 216ab4382d2SGreg Kroah-Hartman } 217ab4382d2SGreg Kroah-Hartman 218ab4382d2SGreg Kroah-Hartman /* 219ab4382d2SGreg Kroah-Hartman * This routine will shutdown a serial port; interrupts are disabled, and 220ab4382d2SGreg Kroah-Hartman * DTR is dropped if the hangup on close termio flag is on. Calls to 221ab4382d2SGreg Kroah-Hartman * uart_shutdown are serialised by the per-port semaphore. 222ab4382d2SGreg Kroah-Hartman */ 223ab4382d2SGreg Kroah-Hartman static void uart_shutdown(struct tty_struct *tty, struct uart_state *state) 224ab4382d2SGreg Kroah-Hartman { 225ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 226ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 227ab4382d2SGreg Kroah-Hartman 228ab4382d2SGreg Kroah-Hartman /* 229ab4382d2SGreg Kroah-Hartman * Set the TTY IO error marker 230ab4382d2SGreg Kroah-Hartman */ 231ab4382d2SGreg Kroah-Hartman if (tty) 232ab4382d2SGreg Kroah-Hartman set_bit(TTY_IO_ERROR, &tty->flags); 233ab4382d2SGreg Kroah-Hartman 234ab4382d2SGreg Kroah-Hartman if (test_and_clear_bit(ASYNCB_INITIALIZED, &port->flags)) { 235ab4382d2SGreg Kroah-Hartman /* 236ab4382d2SGreg Kroah-Hartman * Turn off DTR and RTS early. 237ab4382d2SGreg Kroah-Hartman */ 238adc8d746SAlan Cox if (!tty || (tty->termios.c_cflag & HUPCL)) 239ab4382d2SGreg Kroah-Hartman uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); 240ab4382d2SGreg Kroah-Hartman 241b922e19dSJiri Slaby uart_port_shutdown(port); 242ab4382d2SGreg Kroah-Hartman } 243ab4382d2SGreg Kroah-Hartman 244ab4382d2SGreg Kroah-Hartman /* 245d208a3bfSDoug Anderson * It's possible for shutdown to be called after suspend if we get 246d208a3bfSDoug Anderson * a DCD drop (hangup) at just the right time. Clear suspended bit so 247d208a3bfSDoug Anderson * we don't try to resume a port that has been shutdown. 248ab4382d2SGreg Kroah-Hartman */ 249d208a3bfSDoug Anderson clear_bit(ASYNCB_SUSPENDED, &port->flags); 250ab4382d2SGreg Kroah-Hartman 251ab4382d2SGreg Kroah-Hartman /* 252ab4382d2SGreg Kroah-Hartman * Free the transmit buffer page. 253ab4382d2SGreg Kroah-Hartman */ 254ab4382d2SGreg Kroah-Hartman if (state->xmit.buf) { 255ab4382d2SGreg Kroah-Hartman free_page((unsigned long)state->xmit.buf); 256ab4382d2SGreg Kroah-Hartman state->xmit.buf = NULL; 257ab4382d2SGreg Kroah-Hartman } 258ab4382d2SGreg Kroah-Hartman } 259ab4382d2SGreg Kroah-Hartman 260ab4382d2SGreg Kroah-Hartman /** 261ab4382d2SGreg Kroah-Hartman * uart_update_timeout - update per-port FIFO timeout. 262ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port 263ab4382d2SGreg Kroah-Hartman * @cflag: termios cflag value 264ab4382d2SGreg Kroah-Hartman * @baud: speed of the port 265ab4382d2SGreg Kroah-Hartman * 266ab4382d2SGreg Kroah-Hartman * Set the port FIFO timeout value. The @cflag value should 267ab4382d2SGreg Kroah-Hartman * reflect the actual hardware settings. 268ab4382d2SGreg Kroah-Hartman */ 269ab4382d2SGreg Kroah-Hartman void 270ab4382d2SGreg Kroah-Hartman uart_update_timeout(struct uart_port *port, unsigned int cflag, 271ab4382d2SGreg Kroah-Hartman unsigned int baud) 272ab4382d2SGreg Kroah-Hartman { 273ab4382d2SGreg Kroah-Hartman unsigned int bits; 274ab4382d2SGreg Kroah-Hartman 275ab4382d2SGreg Kroah-Hartman /* byte size and parity */ 276ab4382d2SGreg Kroah-Hartman switch (cflag & CSIZE) { 277ab4382d2SGreg Kroah-Hartman case CS5: 278ab4382d2SGreg Kroah-Hartman bits = 7; 279ab4382d2SGreg Kroah-Hartman break; 280ab4382d2SGreg Kroah-Hartman case CS6: 281ab4382d2SGreg Kroah-Hartman bits = 8; 282ab4382d2SGreg Kroah-Hartman break; 283ab4382d2SGreg Kroah-Hartman case CS7: 284ab4382d2SGreg Kroah-Hartman bits = 9; 285ab4382d2SGreg Kroah-Hartman break; 286ab4382d2SGreg Kroah-Hartman default: 287ab4382d2SGreg Kroah-Hartman bits = 10; 288ab4382d2SGreg Kroah-Hartman break; /* CS8 */ 289ab4382d2SGreg Kroah-Hartman } 290ab4382d2SGreg Kroah-Hartman 291ab4382d2SGreg Kroah-Hartman if (cflag & CSTOPB) 292ab4382d2SGreg Kroah-Hartman bits++; 293ab4382d2SGreg Kroah-Hartman if (cflag & PARENB) 294ab4382d2SGreg Kroah-Hartman bits++; 295ab4382d2SGreg Kroah-Hartman 296ab4382d2SGreg Kroah-Hartman /* 297ab4382d2SGreg Kroah-Hartman * The total number of bits to be transmitted in the fifo. 298ab4382d2SGreg Kroah-Hartman */ 299ab4382d2SGreg Kroah-Hartman bits = bits * port->fifosize; 300ab4382d2SGreg Kroah-Hartman 301ab4382d2SGreg Kroah-Hartman /* 302ab4382d2SGreg Kroah-Hartman * Figure the timeout to send the above number of bits. 303ab4382d2SGreg Kroah-Hartman * Add .02 seconds of slop 304ab4382d2SGreg Kroah-Hartman */ 305ab4382d2SGreg Kroah-Hartman port->timeout = (HZ * bits) / baud + HZ/50; 306ab4382d2SGreg Kroah-Hartman } 307ab4382d2SGreg Kroah-Hartman 308ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_update_timeout); 309ab4382d2SGreg Kroah-Hartman 310ab4382d2SGreg Kroah-Hartman /** 311ab4382d2SGreg Kroah-Hartman * uart_get_baud_rate - return baud rate for a particular port 312ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port in question. 313ab4382d2SGreg Kroah-Hartman * @termios: desired termios settings. 314ab4382d2SGreg Kroah-Hartman * @old: old termios (or NULL) 315ab4382d2SGreg Kroah-Hartman * @min: minimum acceptable baud rate 316ab4382d2SGreg Kroah-Hartman * @max: maximum acceptable baud rate 317ab4382d2SGreg Kroah-Hartman * 318ab4382d2SGreg Kroah-Hartman * Decode the termios structure into a numeric baud rate, 319ab4382d2SGreg Kroah-Hartman * taking account of the magic 38400 baud rate (with spd_* 320ab4382d2SGreg Kroah-Hartman * flags), and mapping the %B0 rate to 9600 baud. 321ab4382d2SGreg Kroah-Hartman * 322ab4382d2SGreg Kroah-Hartman * If the new baud rate is invalid, try the old termios setting. 323ab4382d2SGreg Kroah-Hartman * If it's still invalid, we try 9600 baud. 324ab4382d2SGreg Kroah-Hartman * 325ab4382d2SGreg Kroah-Hartman * Update the @termios structure to reflect the baud rate 326ab4382d2SGreg Kroah-Hartman * we're actually going to be using. Don't do this for the case 327ab4382d2SGreg Kroah-Hartman * where B0 is requested ("hang up"). 328ab4382d2SGreg Kroah-Hartman */ 329ab4382d2SGreg Kroah-Hartman unsigned int 330ab4382d2SGreg Kroah-Hartman uart_get_baud_rate(struct uart_port *port, struct ktermios *termios, 331ab4382d2SGreg Kroah-Hartman struct ktermios *old, unsigned int min, unsigned int max) 332ab4382d2SGreg Kroah-Hartman { 333ab4382d2SGreg Kroah-Hartman unsigned int try, baud, altbaud = 38400; 334ab4382d2SGreg Kroah-Hartman int hung_up = 0; 335ab4382d2SGreg Kroah-Hartman upf_t flags = port->flags & UPF_SPD_MASK; 336ab4382d2SGreg Kroah-Hartman 337ab4382d2SGreg Kroah-Hartman if (flags == UPF_SPD_HI) 338ab4382d2SGreg Kroah-Hartman altbaud = 57600; 339ab4382d2SGreg Kroah-Hartman else if (flags == UPF_SPD_VHI) 340ab4382d2SGreg Kroah-Hartman altbaud = 115200; 341ab4382d2SGreg Kroah-Hartman else if (flags == UPF_SPD_SHI) 342ab4382d2SGreg Kroah-Hartman altbaud = 230400; 343ab4382d2SGreg Kroah-Hartman else if (flags == UPF_SPD_WARP) 344ab4382d2SGreg Kroah-Hartman altbaud = 460800; 345ab4382d2SGreg Kroah-Hartman 346ab4382d2SGreg Kroah-Hartman for (try = 0; try < 2; try++) { 347ab4382d2SGreg Kroah-Hartman baud = tty_termios_baud_rate(termios); 348ab4382d2SGreg Kroah-Hartman 349ab4382d2SGreg Kroah-Hartman /* 350ab4382d2SGreg Kroah-Hartman * The spd_hi, spd_vhi, spd_shi, spd_warp kludge... 351ab4382d2SGreg Kroah-Hartman * Die! Die! Die! 352ab4382d2SGreg Kroah-Hartman */ 353ab4382d2SGreg Kroah-Hartman if (baud == 38400) 354ab4382d2SGreg Kroah-Hartman baud = altbaud; 355ab4382d2SGreg Kroah-Hartman 356ab4382d2SGreg Kroah-Hartman /* 357ab4382d2SGreg Kroah-Hartman * Special case: B0 rate. 358ab4382d2SGreg Kroah-Hartman */ 359ab4382d2SGreg Kroah-Hartman if (baud == 0) { 360ab4382d2SGreg Kroah-Hartman hung_up = 1; 361ab4382d2SGreg Kroah-Hartman baud = 9600; 362ab4382d2SGreg Kroah-Hartman } 363ab4382d2SGreg Kroah-Hartman 364ab4382d2SGreg Kroah-Hartman if (baud >= min && baud <= max) 365ab4382d2SGreg Kroah-Hartman return baud; 366ab4382d2SGreg Kroah-Hartman 367ab4382d2SGreg Kroah-Hartman /* 368ab4382d2SGreg Kroah-Hartman * Oops, the quotient was zero. Try again with 369ab4382d2SGreg Kroah-Hartman * the old baud rate if possible. 370ab4382d2SGreg Kroah-Hartman */ 371ab4382d2SGreg Kroah-Hartman termios->c_cflag &= ~CBAUD; 372ab4382d2SGreg Kroah-Hartman if (old) { 373ab4382d2SGreg Kroah-Hartman baud = tty_termios_baud_rate(old); 374ab4382d2SGreg Kroah-Hartman if (!hung_up) 375ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 376ab4382d2SGreg Kroah-Hartman baud, baud); 377ab4382d2SGreg Kroah-Hartman old = NULL; 378ab4382d2SGreg Kroah-Hartman continue; 379ab4382d2SGreg Kroah-Hartman } 380ab4382d2SGreg Kroah-Hartman 381ab4382d2SGreg Kroah-Hartman /* 382ab4382d2SGreg Kroah-Hartman * As a last resort, if the range cannot be met then clip to 383ab4382d2SGreg Kroah-Hartman * the nearest chip supported rate. 384ab4382d2SGreg Kroah-Hartman */ 385ab4382d2SGreg Kroah-Hartman if (!hung_up) { 386ab4382d2SGreg Kroah-Hartman if (baud <= min) 387ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 388ab4382d2SGreg Kroah-Hartman min + 1, min + 1); 389ab4382d2SGreg Kroah-Hartman else 390ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 391ab4382d2SGreg Kroah-Hartman max - 1, max - 1); 392ab4382d2SGreg Kroah-Hartman } 393ab4382d2SGreg Kroah-Hartman } 394ab4382d2SGreg Kroah-Hartman /* Should never happen */ 395ab4382d2SGreg Kroah-Hartman WARN_ON(1); 396ab4382d2SGreg Kroah-Hartman return 0; 397ab4382d2SGreg Kroah-Hartman } 398ab4382d2SGreg Kroah-Hartman 399ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_get_baud_rate); 400ab4382d2SGreg Kroah-Hartman 401ab4382d2SGreg Kroah-Hartman /** 402ab4382d2SGreg Kroah-Hartman * uart_get_divisor - return uart clock divisor 403ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port. 404ab4382d2SGreg Kroah-Hartman * @baud: desired baud rate 405ab4382d2SGreg Kroah-Hartman * 406ab4382d2SGreg Kroah-Hartman * Calculate the uart clock divisor for the port. 407ab4382d2SGreg Kroah-Hartman */ 408ab4382d2SGreg Kroah-Hartman unsigned int 409ab4382d2SGreg Kroah-Hartman uart_get_divisor(struct uart_port *port, unsigned int baud) 410ab4382d2SGreg Kroah-Hartman { 411ab4382d2SGreg Kroah-Hartman unsigned int quot; 412ab4382d2SGreg Kroah-Hartman 413ab4382d2SGreg Kroah-Hartman /* 414ab4382d2SGreg Kroah-Hartman * Old custom speed handling. 415ab4382d2SGreg Kroah-Hartman */ 416ab4382d2SGreg Kroah-Hartman if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) 417ab4382d2SGreg Kroah-Hartman quot = port->custom_divisor; 418ab4382d2SGreg Kroah-Hartman else 41997d24634SUwe Kleine-König quot = DIV_ROUND_CLOSEST(port->uartclk, 16 * baud); 420ab4382d2SGreg Kroah-Hartman 421ab4382d2SGreg Kroah-Hartman return quot; 422ab4382d2SGreg Kroah-Hartman } 423ab4382d2SGreg Kroah-Hartman 424ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_get_divisor); 425ab4382d2SGreg Kroah-Hartman 426ab4382d2SGreg Kroah-Hartman /* FIXME: Consistent locking policy */ 427ab4382d2SGreg Kroah-Hartman static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, 428ab4382d2SGreg Kroah-Hartman struct ktermios *old_termios) 429ab4382d2SGreg Kroah-Hartman { 430ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 431ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 432ab4382d2SGreg Kroah-Hartman struct ktermios *termios; 433ab4382d2SGreg Kroah-Hartman 434ab4382d2SGreg Kroah-Hartman /* 435ab4382d2SGreg Kroah-Hartman * If we have no tty, termios, or the port does not exist, 436ab4382d2SGreg Kroah-Hartman * then we can't set the parameters for this port. 437ab4382d2SGreg Kroah-Hartman */ 438adc8d746SAlan Cox if (!tty || uport->type == PORT_UNKNOWN) 439ab4382d2SGreg Kroah-Hartman return; 440ab4382d2SGreg Kroah-Hartman 441adc8d746SAlan Cox termios = &tty->termios; 442ab4382d2SGreg Kroah-Hartman 443ab4382d2SGreg Kroah-Hartman /* 444ab4382d2SGreg Kroah-Hartman * Set flags based on termios cflag 445ab4382d2SGreg Kroah-Hartman */ 446ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CRTSCTS) 447ab4382d2SGreg Kroah-Hartman set_bit(ASYNCB_CTS_FLOW, &port->flags); 448ab4382d2SGreg Kroah-Hartman else 449ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_CTS_FLOW, &port->flags); 450ab4382d2SGreg Kroah-Hartman 451ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CLOCAL) 452ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_CHECK_CD, &port->flags); 453ab4382d2SGreg Kroah-Hartman else 454ab4382d2SGreg Kroah-Hartman set_bit(ASYNCB_CHECK_CD, &port->flags); 455ab4382d2SGreg Kroah-Hartman 456ab4382d2SGreg Kroah-Hartman uport->ops->set_termios(uport, termios, old_termios); 457ab4382d2SGreg Kroah-Hartman } 458ab4382d2SGreg Kroah-Hartman 459ab4382d2SGreg Kroah-Hartman static inline int __uart_put_char(struct uart_port *port, 460ab4382d2SGreg Kroah-Hartman struct circ_buf *circ, unsigned char c) 461ab4382d2SGreg Kroah-Hartman { 462ab4382d2SGreg Kroah-Hartman unsigned long flags; 463ab4382d2SGreg Kroah-Hartman int ret = 0; 464ab4382d2SGreg Kroah-Hartman 465ab4382d2SGreg Kroah-Hartman if (!circ->buf) 466ab4382d2SGreg Kroah-Hartman return 0; 467ab4382d2SGreg Kroah-Hartman 468ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 469ab4382d2SGreg Kroah-Hartman if (uart_circ_chars_free(circ) != 0) { 470ab4382d2SGreg Kroah-Hartman circ->buf[circ->head] = c; 471ab4382d2SGreg Kroah-Hartman circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1); 472ab4382d2SGreg Kroah-Hartman ret = 1; 473ab4382d2SGreg Kroah-Hartman } 474ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 475ab4382d2SGreg Kroah-Hartman return ret; 476ab4382d2SGreg Kroah-Hartman } 477ab4382d2SGreg Kroah-Hartman 478ab4382d2SGreg Kroah-Hartman static int uart_put_char(struct tty_struct *tty, unsigned char ch) 479ab4382d2SGreg Kroah-Hartman { 480ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 481ab4382d2SGreg Kroah-Hartman 482ab4382d2SGreg Kroah-Hartman return __uart_put_char(state->uart_port, &state->xmit, ch); 483ab4382d2SGreg Kroah-Hartman } 484ab4382d2SGreg Kroah-Hartman 485ab4382d2SGreg Kroah-Hartman static void uart_flush_chars(struct tty_struct *tty) 486ab4382d2SGreg Kroah-Hartman { 487ab4382d2SGreg Kroah-Hartman uart_start(tty); 488ab4382d2SGreg Kroah-Hartman } 489ab4382d2SGreg Kroah-Hartman 490ab4382d2SGreg Kroah-Hartman static int uart_write(struct tty_struct *tty, 491ab4382d2SGreg Kroah-Hartman const unsigned char *buf, int count) 492ab4382d2SGreg Kroah-Hartman { 493ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 494ab4382d2SGreg Kroah-Hartman struct uart_port *port; 495ab4382d2SGreg Kroah-Hartman struct circ_buf *circ; 496ab4382d2SGreg Kroah-Hartman unsigned long flags; 497ab4382d2SGreg Kroah-Hartman int c, ret = 0; 498ab4382d2SGreg Kroah-Hartman 499ab4382d2SGreg Kroah-Hartman /* 500ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 501ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 502ab4382d2SGreg Kroah-Hartman */ 503ab4382d2SGreg Kroah-Hartman if (!state) { 504ab4382d2SGreg Kroah-Hartman WARN_ON(1); 505ab4382d2SGreg Kroah-Hartman return -EL3HLT; 506ab4382d2SGreg Kroah-Hartman } 507ab4382d2SGreg Kroah-Hartman 508ab4382d2SGreg Kroah-Hartman port = state->uart_port; 509ab4382d2SGreg Kroah-Hartman circ = &state->xmit; 510ab4382d2SGreg Kroah-Hartman 511ab4382d2SGreg Kroah-Hartman if (!circ->buf) 512ab4382d2SGreg Kroah-Hartman return 0; 513ab4382d2SGreg Kroah-Hartman 514ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 515ab4382d2SGreg Kroah-Hartman while (1) { 516ab4382d2SGreg Kroah-Hartman c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE); 517ab4382d2SGreg Kroah-Hartman if (count < c) 518ab4382d2SGreg Kroah-Hartman c = count; 519ab4382d2SGreg Kroah-Hartman if (c <= 0) 520ab4382d2SGreg Kroah-Hartman break; 521ab4382d2SGreg Kroah-Hartman memcpy(circ->buf + circ->head, buf, c); 522ab4382d2SGreg Kroah-Hartman circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1); 523ab4382d2SGreg Kroah-Hartman buf += c; 524ab4382d2SGreg Kroah-Hartman count -= c; 525ab4382d2SGreg Kroah-Hartman ret += c; 526ab4382d2SGreg Kroah-Hartman } 527ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 528ab4382d2SGreg Kroah-Hartman 529ab4382d2SGreg Kroah-Hartman uart_start(tty); 530ab4382d2SGreg Kroah-Hartman return ret; 531ab4382d2SGreg Kroah-Hartman } 532ab4382d2SGreg Kroah-Hartman 533ab4382d2SGreg Kroah-Hartman static int uart_write_room(struct tty_struct *tty) 534ab4382d2SGreg Kroah-Hartman { 535ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 536ab4382d2SGreg Kroah-Hartman unsigned long flags; 537ab4382d2SGreg Kroah-Hartman int ret; 538ab4382d2SGreg Kroah-Hartman 539ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&state->uart_port->lock, flags); 540ab4382d2SGreg Kroah-Hartman ret = uart_circ_chars_free(&state->xmit); 541ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&state->uart_port->lock, flags); 542ab4382d2SGreg Kroah-Hartman return ret; 543ab4382d2SGreg Kroah-Hartman } 544ab4382d2SGreg Kroah-Hartman 545ab4382d2SGreg Kroah-Hartman static int uart_chars_in_buffer(struct tty_struct *tty) 546ab4382d2SGreg Kroah-Hartman { 547ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 548ab4382d2SGreg Kroah-Hartman unsigned long flags; 549ab4382d2SGreg Kroah-Hartman int ret; 550ab4382d2SGreg Kroah-Hartman 551ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&state->uart_port->lock, flags); 552ab4382d2SGreg Kroah-Hartman ret = uart_circ_chars_pending(&state->xmit); 553ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&state->uart_port->lock, flags); 554ab4382d2SGreg Kroah-Hartman return ret; 555ab4382d2SGreg Kroah-Hartman } 556ab4382d2SGreg Kroah-Hartman 557ab4382d2SGreg Kroah-Hartman static void uart_flush_buffer(struct tty_struct *tty) 558ab4382d2SGreg Kroah-Hartman { 559ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 560ab4382d2SGreg Kroah-Hartman struct uart_port *port; 561ab4382d2SGreg Kroah-Hartman unsigned long flags; 562ab4382d2SGreg Kroah-Hartman 563ab4382d2SGreg Kroah-Hartman /* 564ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 565ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 566ab4382d2SGreg Kroah-Hartman */ 567ab4382d2SGreg Kroah-Hartman if (!state) { 568ab4382d2SGreg Kroah-Hartman WARN_ON(1); 569ab4382d2SGreg Kroah-Hartman return; 570ab4382d2SGreg Kroah-Hartman } 571ab4382d2SGreg Kroah-Hartman 572ab4382d2SGreg Kroah-Hartman port = state->uart_port; 573ab4382d2SGreg Kroah-Hartman pr_debug("uart_flush_buffer(%d) called\n", tty->index); 574ab4382d2SGreg Kroah-Hartman 575ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 576ab4382d2SGreg Kroah-Hartman uart_circ_clear(&state->xmit); 577ab4382d2SGreg Kroah-Hartman if (port->ops->flush_buffer) 578ab4382d2SGreg Kroah-Hartman port->ops->flush_buffer(port); 579ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 580ab4382d2SGreg Kroah-Hartman tty_wakeup(tty); 581ab4382d2SGreg Kroah-Hartman } 582ab4382d2SGreg Kroah-Hartman 583ab4382d2SGreg Kroah-Hartman /* 584ab4382d2SGreg Kroah-Hartman * This function is used to send a high-priority XON/XOFF character to 585ab4382d2SGreg Kroah-Hartman * the device 586ab4382d2SGreg Kroah-Hartman */ 587ab4382d2SGreg Kroah-Hartman static void uart_send_xchar(struct tty_struct *tty, char ch) 588ab4382d2SGreg Kroah-Hartman { 589ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 590ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 591ab4382d2SGreg Kroah-Hartman unsigned long flags; 592ab4382d2SGreg Kroah-Hartman 593ab4382d2SGreg Kroah-Hartman if (port->ops->send_xchar) 594ab4382d2SGreg Kroah-Hartman port->ops->send_xchar(port, ch); 595ab4382d2SGreg Kroah-Hartman else { 596ab4382d2SGreg Kroah-Hartman port->x_char = ch; 597ab4382d2SGreg Kroah-Hartman if (ch) { 598ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 599ab4382d2SGreg Kroah-Hartman port->ops->start_tx(port); 600ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 601ab4382d2SGreg Kroah-Hartman } 602ab4382d2SGreg Kroah-Hartman } 603ab4382d2SGreg Kroah-Hartman } 604ab4382d2SGreg Kroah-Hartman 605ab4382d2SGreg Kroah-Hartman static void uart_throttle(struct tty_struct *tty) 606ab4382d2SGreg Kroah-Hartman { 607ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 6089aba8d5bSRussell King struct uart_port *port = state->uart_port; 6099aba8d5bSRussell King uint32_t mask = 0; 610ab4382d2SGreg Kroah-Hartman 611ab4382d2SGreg Kroah-Hartman if (I_IXOFF(tty)) 6129aba8d5bSRussell King mask |= UPF_SOFT_FLOW; 6139aba8d5bSRussell King if (tty->termios.c_cflag & CRTSCTS) 6149aba8d5bSRussell King mask |= UPF_HARD_FLOW; 6159aba8d5bSRussell King 6169aba8d5bSRussell King if (port->flags & mask) { 6179aba8d5bSRussell King port->ops->throttle(port); 6189aba8d5bSRussell King mask &= ~port->flags; 6199aba8d5bSRussell King } 6209aba8d5bSRussell King 6219aba8d5bSRussell King if (mask & UPF_SOFT_FLOW) 622ab4382d2SGreg Kroah-Hartman uart_send_xchar(tty, STOP_CHAR(tty)); 623ab4382d2SGreg Kroah-Hartman 6249aba8d5bSRussell King if (mask & UPF_HARD_FLOW) 6259aba8d5bSRussell King uart_clear_mctrl(port, TIOCM_RTS); 626ab4382d2SGreg Kroah-Hartman } 627ab4382d2SGreg Kroah-Hartman 628ab4382d2SGreg Kroah-Hartman static void uart_unthrottle(struct tty_struct *tty) 629ab4382d2SGreg Kroah-Hartman { 630ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 631ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 6329aba8d5bSRussell King uint32_t mask = 0; 633ab4382d2SGreg Kroah-Hartman 6349aba8d5bSRussell King if (I_IXOFF(tty)) 6359aba8d5bSRussell King mask |= UPF_SOFT_FLOW; 6369aba8d5bSRussell King if (tty->termios.c_cflag & CRTSCTS) 6379aba8d5bSRussell King mask |= UPF_HARD_FLOW; 6389aba8d5bSRussell King 6399aba8d5bSRussell King if (port->flags & mask) { 6409aba8d5bSRussell King port->ops->unthrottle(port); 6419aba8d5bSRussell King mask &= ~port->flags; 6429aba8d5bSRussell King } 6439aba8d5bSRussell King 6449aba8d5bSRussell King if (mask & UPF_SOFT_FLOW) { 645ab4382d2SGreg Kroah-Hartman if (port->x_char) 646ab4382d2SGreg Kroah-Hartman port->x_char = 0; 647ab4382d2SGreg Kroah-Hartman else 648ab4382d2SGreg Kroah-Hartman uart_send_xchar(tty, START_CHAR(tty)); 649ab4382d2SGreg Kroah-Hartman } 650ab4382d2SGreg Kroah-Hartman 6519aba8d5bSRussell King if (mask & UPF_HARD_FLOW) 652ab4382d2SGreg Kroah-Hartman uart_set_mctrl(port, TIOCM_RTS); 653ab4382d2SGreg Kroah-Hartman } 654ab4382d2SGreg Kroah-Hartman 6559f109694SAlan Cox static void do_uart_get_info(struct tty_port *port, 6567ba2e769SAlan Cox struct serial_struct *retinfo) 657ab4382d2SGreg Kroah-Hartman { 6589f109694SAlan Cox struct uart_state *state = container_of(port, struct uart_state, port); 659ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 6607ba2e769SAlan Cox 66137cd0c99SFengguang Wu memset(retinfo, 0, sizeof(*retinfo)); 6627ba2e769SAlan Cox 6637ba2e769SAlan Cox retinfo->type = uport->type; 6647ba2e769SAlan Cox retinfo->line = uport->line; 6657ba2e769SAlan Cox retinfo->port = uport->iobase; 6667ba2e769SAlan Cox if (HIGH_BITS_OFFSET) 6677ba2e769SAlan Cox retinfo->port_high = (long) uport->iobase >> HIGH_BITS_OFFSET; 6687ba2e769SAlan Cox retinfo->irq = uport->irq; 6697ba2e769SAlan Cox retinfo->flags = uport->flags; 6707ba2e769SAlan Cox retinfo->xmit_fifo_size = uport->fifosize; 6717ba2e769SAlan Cox retinfo->baud_base = uport->uartclk / 16; 6727ba2e769SAlan Cox retinfo->close_delay = jiffies_to_msecs(port->close_delay) / 10; 6737ba2e769SAlan Cox retinfo->closing_wait = port->closing_wait == ASYNC_CLOSING_WAIT_NONE ? 6747ba2e769SAlan Cox ASYNC_CLOSING_WAIT_NONE : 6757ba2e769SAlan Cox jiffies_to_msecs(port->closing_wait) / 10; 6767ba2e769SAlan Cox retinfo->custom_divisor = uport->custom_divisor; 6777ba2e769SAlan Cox retinfo->hub6 = uport->hub6; 6787ba2e769SAlan Cox retinfo->io_type = uport->iotype; 6797ba2e769SAlan Cox retinfo->iomem_reg_shift = uport->regshift; 6807ba2e769SAlan Cox retinfo->iomem_base = (void *)(unsigned long)uport->mapbase; 6817ba2e769SAlan Cox } 6827ba2e769SAlan Cox 6839f109694SAlan Cox static void uart_get_info(struct tty_port *port, 6849f109694SAlan Cox struct serial_struct *retinfo) 6857ba2e769SAlan Cox { 686ab4382d2SGreg Kroah-Hartman /* Ensure the state we copy is consistent and no hardware changes 687ab4382d2SGreg Kroah-Hartman occur as we go */ 688ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 6899f109694SAlan Cox do_uart_get_info(port, retinfo); 690ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 6919f109694SAlan Cox } 6929f109694SAlan Cox 6939f109694SAlan Cox static int uart_get_info_user(struct tty_port *port, 6949f109694SAlan Cox struct serial_struct __user *retinfo) 6959f109694SAlan Cox { 6969f109694SAlan Cox struct serial_struct tmp; 6979f109694SAlan Cox uart_get_info(port, &tmp); 698ab4382d2SGreg Kroah-Hartman 699ab4382d2SGreg Kroah-Hartman if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) 700ab4382d2SGreg Kroah-Hartman return -EFAULT; 701ab4382d2SGreg Kroah-Hartman return 0; 702ab4382d2SGreg Kroah-Hartman } 703ab4382d2SGreg Kroah-Hartman 7047ba2e769SAlan Cox static int uart_set_info(struct tty_struct *tty, struct tty_port *port, 7057ba2e769SAlan Cox struct uart_state *state, 7067ba2e769SAlan Cox struct serial_struct *new_info) 707ab4382d2SGreg Kroah-Hartman { 708ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 709ab4382d2SGreg Kroah-Hartman unsigned long new_port; 710ab4382d2SGreg Kroah-Hartman unsigned int change_irq, change_port, closing_wait; 711ab4382d2SGreg Kroah-Hartman unsigned int old_custom_divisor, close_delay; 712ab4382d2SGreg Kroah-Hartman upf_t old_flags, new_flags; 713ab4382d2SGreg Kroah-Hartman int retval = 0; 714ab4382d2SGreg Kroah-Hartman 7157ba2e769SAlan Cox new_port = new_info->port; 716ab4382d2SGreg Kroah-Hartman if (HIGH_BITS_OFFSET) 7177ba2e769SAlan Cox new_port += (unsigned long) new_info->port_high << HIGH_BITS_OFFSET; 718ab4382d2SGreg Kroah-Hartman 7197ba2e769SAlan Cox new_info->irq = irq_canonicalize(new_info->irq); 7207ba2e769SAlan Cox close_delay = msecs_to_jiffies(new_info->close_delay * 10); 7217ba2e769SAlan Cox closing_wait = new_info->closing_wait == ASYNC_CLOSING_WAIT_NONE ? 7224cb0fbfdSJiri Slaby ASYNC_CLOSING_WAIT_NONE : 7237ba2e769SAlan Cox msecs_to_jiffies(new_info->closing_wait * 10); 724ab4382d2SGreg Kroah-Hartman 725ab4382d2SGreg Kroah-Hartman 726ab4382d2SGreg Kroah-Hartman change_irq = !(uport->flags & UPF_FIXED_PORT) 7277ba2e769SAlan Cox && new_info->irq != uport->irq; 728ab4382d2SGreg Kroah-Hartman 729ab4382d2SGreg Kroah-Hartman /* 730ab4382d2SGreg Kroah-Hartman * Since changing the 'type' of the port changes its resource 731ab4382d2SGreg Kroah-Hartman * allocations, we should treat type changes the same as 732ab4382d2SGreg Kroah-Hartman * IO port changes. 733ab4382d2SGreg Kroah-Hartman */ 734ab4382d2SGreg Kroah-Hartman change_port = !(uport->flags & UPF_FIXED_PORT) 735ab4382d2SGreg Kroah-Hartman && (new_port != uport->iobase || 7367ba2e769SAlan Cox (unsigned long)new_info->iomem_base != uport->mapbase || 7377ba2e769SAlan Cox new_info->hub6 != uport->hub6 || 7387ba2e769SAlan Cox new_info->io_type != uport->iotype || 7397ba2e769SAlan Cox new_info->iomem_reg_shift != uport->regshift || 7407ba2e769SAlan Cox new_info->type != uport->type); 741ab4382d2SGreg Kroah-Hartman 742ab4382d2SGreg Kroah-Hartman old_flags = uport->flags; 7437ba2e769SAlan Cox new_flags = new_info->flags; 744ab4382d2SGreg Kroah-Hartman old_custom_divisor = uport->custom_divisor; 745ab4382d2SGreg Kroah-Hartman 746ab4382d2SGreg Kroah-Hartman if (!capable(CAP_SYS_ADMIN)) { 747ab4382d2SGreg Kroah-Hartman retval = -EPERM; 748ab4382d2SGreg Kroah-Hartman if (change_irq || change_port || 7497ba2e769SAlan Cox (new_info->baud_base != uport->uartclk / 16) || 750ab4382d2SGreg Kroah-Hartman (close_delay != port->close_delay) || 751ab4382d2SGreg Kroah-Hartman (closing_wait != port->closing_wait) || 7527ba2e769SAlan Cox (new_info->xmit_fifo_size && 7537ba2e769SAlan Cox new_info->xmit_fifo_size != uport->fifosize) || 754ab4382d2SGreg Kroah-Hartman (((new_flags ^ old_flags) & ~UPF_USR_MASK) != 0)) 755ab4382d2SGreg Kroah-Hartman goto exit; 756ab4382d2SGreg Kroah-Hartman uport->flags = ((uport->flags & ~UPF_USR_MASK) | 757ab4382d2SGreg Kroah-Hartman (new_flags & UPF_USR_MASK)); 7587ba2e769SAlan Cox uport->custom_divisor = new_info->custom_divisor; 759ab4382d2SGreg Kroah-Hartman goto check_and_exit; 760ab4382d2SGreg Kroah-Hartman } 761ab4382d2SGreg Kroah-Hartman 762ab4382d2SGreg Kroah-Hartman /* 763ab4382d2SGreg Kroah-Hartman * Ask the low level driver to verify the settings. 764ab4382d2SGreg Kroah-Hartman */ 765ab4382d2SGreg Kroah-Hartman if (uport->ops->verify_port) 7667ba2e769SAlan Cox retval = uport->ops->verify_port(uport, new_info); 767ab4382d2SGreg Kroah-Hartman 7687ba2e769SAlan Cox if ((new_info->irq >= nr_irqs) || (new_info->irq < 0) || 7697ba2e769SAlan Cox (new_info->baud_base < 9600)) 770ab4382d2SGreg Kroah-Hartman retval = -EINVAL; 771ab4382d2SGreg Kroah-Hartman 772ab4382d2SGreg Kroah-Hartman if (retval) 773ab4382d2SGreg Kroah-Hartman goto exit; 774ab4382d2SGreg Kroah-Hartman 775ab4382d2SGreg Kroah-Hartman if (change_port || change_irq) { 776ab4382d2SGreg Kroah-Hartman retval = -EBUSY; 777ab4382d2SGreg Kroah-Hartman 778ab4382d2SGreg Kroah-Hartman /* 779ab4382d2SGreg Kroah-Hartman * Make sure that we are the sole user of this port. 780ab4382d2SGreg Kroah-Hartman */ 781ab4382d2SGreg Kroah-Hartman if (tty_port_users(port) > 1) 782ab4382d2SGreg Kroah-Hartman goto exit; 783ab4382d2SGreg Kroah-Hartman 784ab4382d2SGreg Kroah-Hartman /* 785ab4382d2SGreg Kroah-Hartman * We need to shutdown the serial port at the old 786ab4382d2SGreg Kroah-Hartman * port/type/irq combination. 787ab4382d2SGreg Kroah-Hartman */ 788ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 789ab4382d2SGreg Kroah-Hartman } 790ab4382d2SGreg Kroah-Hartman 791ab4382d2SGreg Kroah-Hartman if (change_port) { 792ab4382d2SGreg Kroah-Hartman unsigned long old_iobase, old_mapbase; 793ab4382d2SGreg Kroah-Hartman unsigned int old_type, old_iotype, old_hub6, old_shift; 794ab4382d2SGreg Kroah-Hartman 795ab4382d2SGreg Kroah-Hartman old_iobase = uport->iobase; 796ab4382d2SGreg Kroah-Hartman old_mapbase = uport->mapbase; 797ab4382d2SGreg Kroah-Hartman old_type = uport->type; 798ab4382d2SGreg Kroah-Hartman old_hub6 = uport->hub6; 799ab4382d2SGreg Kroah-Hartman old_iotype = uport->iotype; 800ab4382d2SGreg Kroah-Hartman old_shift = uport->regshift; 801ab4382d2SGreg Kroah-Hartman 802ab4382d2SGreg Kroah-Hartman /* 803ab4382d2SGreg Kroah-Hartman * Free and release old regions 804ab4382d2SGreg Kroah-Hartman */ 805ab4382d2SGreg Kroah-Hartman if (old_type != PORT_UNKNOWN) 806ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 807ab4382d2SGreg Kroah-Hartman 808ab4382d2SGreg Kroah-Hartman uport->iobase = new_port; 8097ba2e769SAlan Cox uport->type = new_info->type; 8107ba2e769SAlan Cox uport->hub6 = new_info->hub6; 8117ba2e769SAlan Cox uport->iotype = new_info->io_type; 8127ba2e769SAlan Cox uport->regshift = new_info->iomem_reg_shift; 8137ba2e769SAlan Cox uport->mapbase = (unsigned long)new_info->iomem_base; 814ab4382d2SGreg Kroah-Hartman 815ab4382d2SGreg Kroah-Hartman /* 816ab4382d2SGreg Kroah-Hartman * Claim and map the new regions 817ab4382d2SGreg Kroah-Hartman */ 818ab4382d2SGreg Kroah-Hartman if (uport->type != PORT_UNKNOWN) { 819ab4382d2SGreg Kroah-Hartman retval = uport->ops->request_port(uport); 820ab4382d2SGreg Kroah-Hartman } else { 821ab4382d2SGreg Kroah-Hartman /* Always success - Jean II */ 822ab4382d2SGreg Kroah-Hartman retval = 0; 823ab4382d2SGreg Kroah-Hartman } 824ab4382d2SGreg Kroah-Hartman 825ab4382d2SGreg Kroah-Hartman /* 826ab4382d2SGreg Kroah-Hartman * If we fail to request resources for the 827ab4382d2SGreg Kroah-Hartman * new port, try to restore the old settings. 828ab4382d2SGreg Kroah-Hartman */ 829ab4382d2SGreg Kroah-Hartman if (retval && old_type != PORT_UNKNOWN) { 830ab4382d2SGreg Kroah-Hartman uport->iobase = old_iobase; 831ab4382d2SGreg Kroah-Hartman uport->type = old_type; 832ab4382d2SGreg Kroah-Hartman uport->hub6 = old_hub6; 833ab4382d2SGreg Kroah-Hartman uport->iotype = old_iotype; 834ab4382d2SGreg Kroah-Hartman uport->regshift = old_shift; 835ab4382d2SGreg Kroah-Hartman uport->mapbase = old_mapbase; 836ab4382d2SGreg Kroah-Hartman retval = uport->ops->request_port(uport); 837ab4382d2SGreg Kroah-Hartman /* 838ab4382d2SGreg Kroah-Hartman * If we failed to restore the old settings, 839ab4382d2SGreg Kroah-Hartman * we fail like this. 840ab4382d2SGreg Kroah-Hartman */ 841ab4382d2SGreg Kroah-Hartman if (retval) 842ab4382d2SGreg Kroah-Hartman uport->type = PORT_UNKNOWN; 843ab4382d2SGreg Kroah-Hartman 844ab4382d2SGreg Kroah-Hartman /* 845ab4382d2SGreg Kroah-Hartman * We failed anyway. 846ab4382d2SGreg Kroah-Hartman */ 847ab4382d2SGreg Kroah-Hartman retval = -EBUSY; 848ab4382d2SGreg Kroah-Hartman /* Added to return the correct error -Ram Gupta */ 849ab4382d2SGreg Kroah-Hartman goto exit; 850ab4382d2SGreg Kroah-Hartman } 851ab4382d2SGreg Kroah-Hartman } 852ab4382d2SGreg Kroah-Hartman 853ab4382d2SGreg Kroah-Hartman if (change_irq) 8547ba2e769SAlan Cox uport->irq = new_info->irq; 855ab4382d2SGreg Kroah-Hartman if (!(uport->flags & UPF_FIXED_PORT)) 8567ba2e769SAlan Cox uport->uartclk = new_info->baud_base * 16; 857ab4382d2SGreg Kroah-Hartman uport->flags = (uport->flags & ~UPF_CHANGE_MASK) | 858ab4382d2SGreg Kroah-Hartman (new_flags & UPF_CHANGE_MASK); 8597ba2e769SAlan Cox uport->custom_divisor = new_info->custom_divisor; 860ab4382d2SGreg Kroah-Hartman port->close_delay = close_delay; 861ab4382d2SGreg Kroah-Hartman port->closing_wait = closing_wait; 8627ba2e769SAlan Cox if (new_info->xmit_fifo_size) 8637ba2e769SAlan Cox uport->fifosize = new_info->xmit_fifo_size; 864d6c53c0eSJiri Slaby port->low_latency = (uport->flags & UPF_LOW_LATENCY) ? 1 : 0; 865ab4382d2SGreg Kroah-Hartman 866ab4382d2SGreg Kroah-Hartman check_and_exit: 867ab4382d2SGreg Kroah-Hartman retval = 0; 868ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) 869ab4382d2SGreg Kroah-Hartman goto exit; 870ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_INITIALIZED) { 871ab4382d2SGreg Kroah-Hartman if (((old_flags ^ uport->flags) & UPF_SPD_MASK) || 872ab4382d2SGreg Kroah-Hartman old_custom_divisor != uport->custom_divisor) { 873ab4382d2SGreg Kroah-Hartman /* 874ab4382d2SGreg Kroah-Hartman * If they're setting up a custom divisor or speed, 875ab4382d2SGreg Kroah-Hartman * instead of clearing it, then bitch about it. No 876ab4382d2SGreg Kroah-Hartman * need to rate-limit; it's CAP_SYS_ADMIN only. 877ab4382d2SGreg Kroah-Hartman */ 878ab4382d2SGreg Kroah-Hartman if (uport->flags & UPF_SPD_MASK) { 879ab4382d2SGreg Kroah-Hartman char buf[64]; 880ab4382d2SGreg Kroah-Hartman printk(KERN_NOTICE 881ab4382d2SGreg Kroah-Hartman "%s sets custom speed on %s. This " 882ab4382d2SGreg Kroah-Hartman "is deprecated.\n", current->comm, 883ab4382d2SGreg Kroah-Hartman tty_name(port->tty, buf)); 884ab4382d2SGreg Kroah-Hartman } 885ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 886ab4382d2SGreg Kroah-Hartman } 887ab4382d2SGreg Kroah-Hartman } else 888ab4382d2SGreg Kroah-Hartman retval = uart_startup(tty, state, 1); 889ab4382d2SGreg Kroah-Hartman exit: 8907ba2e769SAlan Cox return retval; 8917ba2e769SAlan Cox } 8927ba2e769SAlan Cox 8937ba2e769SAlan Cox static int uart_set_info_user(struct tty_struct *tty, struct uart_state *state, 8947ba2e769SAlan Cox struct serial_struct __user *newinfo) 8957ba2e769SAlan Cox { 8967ba2e769SAlan Cox struct serial_struct new_serial; 8977ba2e769SAlan Cox struct tty_port *port = &state->port; 8987ba2e769SAlan Cox int retval; 8997ba2e769SAlan Cox 9007ba2e769SAlan Cox if (copy_from_user(&new_serial, newinfo, sizeof(new_serial))) 9017ba2e769SAlan Cox return -EFAULT; 9027ba2e769SAlan Cox 9037ba2e769SAlan Cox /* 9047ba2e769SAlan Cox * This semaphore protects port->count. It is also 9057ba2e769SAlan Cox * very useful to prevent opens. Also, take the 9067ba2e769SAlan Cox * port configuration semaphore to make sure that a 9077ba2e769SAlan Cox * module insertion/removal doesn't change anything 9087ba2e769SAlan Cox * under us. 9097ba2e769SAlan Cox */ 9107ba2e769SAlan Cox mutex_lock(&port->mutex); 9117ba2e769SAlan Cox retval = uart_set_info(tty, port, state, &new_serial); 912ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 913ab4382d2SGreg Kroah-Hartman return retval; 914ab4382d2SGreg Kroah-Hartman } 915ab4382d2SGreg Kroah-Hartman 916ab4382d2SGreg Kroah-Hartman /** 917ab4382d2SGreg Kroah-Hartman * uart_get_lsr_info - get line status register info 918ab4382d2SGreg Kroah-Hartman * @tty: tty associated with the UART 919ab4382d2SGreg Kroah-Hartman * @state: UART being queried 920ab4382d2SGreg Kroah-Hartman * @value: returned modem value 921ab4382d2SGreg Kroah-Hartman * 922ab4382d2SGreg Kroah-Hartman * Note: uart_ioctl protects us against hangups. 923ab4382d2SGreg Kroah-Hartman */ 924ab4382d2SGreg Kroah-Hartman static int uart_get_lsr_info(struct tty_struct *tty, 925ab4382d2SGreg Kroah-Hartman struct uart_state *state, unsigned int __user *value) 926ab4382d2SGreg Kroah-Hartman { 927ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 928ab4382d2SGreg Kroah-Hartman unsigned int result; 929ab4382d2SGreg Kroah-Hartman 930ab4382d2SGreg Kroah-Hartman result = uport->ops->tx_empty(uport); 931ab4382d2SGreg Kroah-Hartman 932ab4382d2SGreg Kroah-Hartman /* 933ab4382d2SGreg Kroah-Hartman * If we're about to load something into the transmit 934ab4382d2SGreg Kroah-Hartman * register, we'll pretend the transmitter isn't empty to 935ab4382d2SGreg Kroah-Hartman * avoid a race condition (depending on when the transmit 936ab4382d2SGreg Kroah-Hartman * interrupt happens). 937ab4382d2SGreg Kroah-Hartman */ 938ab4382d2SGreg Kroah-Hartman if (uport->x_char || 939ab4382d2SGreg Kroah-Hartman ((uart_circ_chars_pending(&state->xmit) > 0) && 940ab4382d2SGreg Kroah-Hartman !tty->stopped && !tty->hw_stopped)) 941ab4382d2SGreg Kroah-Hartman result &= ~TIOCSER_TEMT; 942ab4382d2SGreg Kroah-Hartman 943ab4382d2SGreg Kroah-Hartman return put_user(result, value); 944ab4382d2SGreg Kroah-Hartman } 945ab4382d2SGreg Kroah-Hartman 94660b33c13SAlan Cox static int uart_tiocmget(struct tty_struct *tty) 947ab4382d2SGreg Kroah-Hartman { 948ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 949ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 950ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 951ab4382d2SGreg Kroah-Hartman int result = -EIO; 952ab4382d2SGreg Kroah-Hartman 953ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 95460b33c13SAlan Cox if (!(tty->flags & (1 << TTY_IO_ERROR))) { 955ab4382d2SGreg Kroah-Hartman result = uport->mctrl; 956ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 957ab4382d2SGreg Kroah-Hartman result |= uport->ops->get_mctrl(uport); 958ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 959ab4382d2SGreg Kroah-Hartman } 960ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 961ab4382d2SGreg Kroah-Hartman 962ab4382d2SGreg Kroah-Hartman return result; 963ab4382d2SGreg Kroah-Hartman } 964ab4382d2SGreg Kroah-Hartman 965ab4382d2SGreg Kroah-Hartman static int 96620b9d177SAlan Cox uart_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear) 967ab4382d2SGreg Kroah-Hartman { 968ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 969ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 970ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 971ab4382d2SGreg Kroah-Hartman int ret = -EIO; 972ab4382d2SGreg Kroah-Hartman 973ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 97420b9d177SAlan Cox if (!(tty->flags & (1 << TTY_IO_ERROR))) { 975ab4382d2SGreg Kroah-Hartman uart_update_mctrl(uport, set, clear); 976ab4382d2SGreg Kroah-Hartman ret = 0; 977ab4382d2SGreg Kroah-Hartman } 978ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 979ab4382d2SGreg Kroah-Hartman return ret; 980ab4382d2SGreg Kroah-Hartman } 981ab4382d2SGreg Kroah-Hartman 982ab4382d2SGreg Kroah-Hartman static int uart_break_ctl(struct tty_struct *tty, int break_state) 983ab4382d2SGreg Kroah-Hartman { 984ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 985ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 986ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 987ab4382d2SGreg Kroah-Hartman 988ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 989ab4382d2SGreg Kroah-Hartman 990ab4382d2SGreg Kroah-Hartman if (uport->type != PORT_UNKNOWN) 991ab4382d2SGreg Kroah-Hartman uport->ops->break_ctl(uport, break_state); 992ab4382d2SGreg Kroah-Hartman 993ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 994ab4382d2SGreg Kroah-Hartman return 0; 995ab4382d2SGreg Kroah-Hartman } 996ab4382d2SGreg Kroah-Hartman 997ab4382d2SGreg Kroah-Hartman static int uart_do_autoconfig(struct tty_struct *tty,struct uart_state *state) 998ab4382d2SGreg Kroah-Hartman { 999ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1000ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1001ab4382d2SGreg Kroah-Hartman int flags, ret; 1002ab4382d2SGreg Kroah-Hartman 1003ab4382d2SGreg Kroah-Hartman if (!capable(CAP_SYS_ADMIN)) 1004ab4382d2SGreg Kroah-Hartman return -EPERM; 1005ab4382d2SGreg Kroah-Hartman 1006ab4382d2SGreg Kroah-Hartman /* 1007ab4382d2SGreg Kroah-Hartman * Take the per-port semaphore. This prevents count from 1008ab4382d2SGreg Kroah-Hartman * changing, and hence any extra opens of the port while 1009ab4382d2SGreg Kroah-Hartman * we're auto-configuring. 1010ab4382d2SGreg Kroah-Hartman */ 1011ab4382d2SGreg Kroah-Hartman if (mutex_lock_interruptible(&port->mutex)) 1012ab4382d2SGreg Kroah-Hartman return -ERESTARTSYS; 1013ab4382d2SGreg Kroah-Hartman 1014ab4382d2SGreg Kroah-Hartman ret = -EBUSY; 1015ab4382d2SGreg Kroah-Hartman if (tty_port_users(port) == 1) { 1016ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 1017ab4382d2SGreg Kroah-Hartman 1018ab4382d2SGreg Kroah-Hartman /* 1019ab4382d2SGreg Kroah-Hartman * If we already have a port type configured, 1020ab4382d2SGreg Kroah-Hartman * we must release its resources. 1021ab4382d2SGreg Kroah-Hartman */ 1022ab4382d2SGreg Kroah-Hartman if (uport->type != PORT_UNKNOWN) 1023ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 1024ab4382d2SGreg Kroah-Hartman 1025ab4382d2SGreg Kroah-Hartman flags = UART_CONFIG_TYPE; 1026ab4382d2SGreg Kroah-Hartman if (uport->flags & UPF_AUTO_IRQ) 1027ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_IRQ; 1028ab4382d2SGreg Kroah-Hartman 1029ab4382d2SGreg Kroah-Hartman /* 1030ab4382d2SGreg Kroah-Hartman * This will claim the ports resources if 1031ab4382d2SGreg Kroah-Hartman * a port is found. 1032ab4382d2SGreg Kroah-Hartman */ 1033ab4382d2SGreg Kroah-Hartman uport->ops->config_port(uport, flags); 1034ab4382d2SGreg Kroah-Hartman 1035ab4382d2SGreg Kroah-Hartman ret = uart_startup(tty, state, 1); 1036ab4382d2SGreg Kroah-Hartman } 1037ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1038ab4382d2SGreg Kroah-Hartman return ret; 1039ab4382d2SGreg Kroah-Hartman } 1040ab4382d2SGreg Kroah-Hartman 1041ab4382d2SGreg Kroah-Hartman /* 1042ab4382d2SGreg Kroah-Hartman * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change 1043ab4382d2SGreg Kroah-Hartman * - mask passed in arg for lines of interest 1044ab4382d2SGreg Kroah-Hartman * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) 1045ab4382d2SGreg Kroah-Hartman * Caller should use TIOCGICOUNT to see which one it was 1046ab4382d2SGreg Kroah-Hartman * 1047ab4382d2SGreg Kroah-Hartman * FIXME: This wants extracting into a common all driver implementation 1048ab4382d2SGreg Kroah-Hartman * of TIOCMWAIT using tty_port. 1049ab4382d2SGreg Kroah-Hartman */ 1050ab4382d2SGreg Kroah-Hartman static int 1051ab4382d2SGreg Kroah-Hartman uart_wait_modem_status(struct uart_state *state, unsigned long arg) 1052ab4382d2SGreg Kroah-Hartman { 1053ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1054ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1055ab4382d2SGreg Kroah-Hartman DECLARE_WAITQUEUE(wait, current); 1056ab4382d2SGreg Kroah-Hartman struct uart_icount cprev, cnow; 1057ab4382d2SGreg Kroah-Hartman int ret; 1058ab4382d2SGreg Kroah-Hartman 1059ab4382d2SGreg Kroah-Hartman /* 1060ab4382d2SGreg Kroah-Hartman * note the counters on entry 1061ab4382d2SGreg Kroah-Hartman */ 1062ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1063ab4382d2SGreg Kroah-Hartman memcpy(&cprev, &uport->icount, sizeof(struct uart_icount)); 1064ab4382d2SGreg Kroah-Hartman 1065ab4382d2SGreg Kroah-Hartman /* 1066ab4382d2SGreg Kroah-Hartman * Force modem status interrupts on 1067ab4382d2SGreg Kroah-Hartman */ 1068ab4382d2SGreg Kroah-Hartman uport->ops->enable_ms(uport); 1069ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1070ab4382d2SGreg Kroah-Hartman 1071ab4382d2SGreg Kroah-Hartman add_wait_queue(&port->delta_msr_wait, &wait); 1072ab4382d2SGreg Kroah-Hartman for (;;) { 1073ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1074ab4382d2SGreg Kroah-Hartman memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); 1075ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1076ab4382d2SGreg Kroah-Hartman 1077ab4382d2SGreg Kroah-Hartman set_current_state(TASK_INTERRUPTIBLE); 1078ab4382d2SGreg Kroah-Hartman 1079ab4382d2SGreg Kroah-Hartman if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || 1080ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || 1081ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || 1082ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) { 1083ab4382d2SGreg Kroah-Hartman ret = 0; 1084ab4382d2SGreg Kroah-Hartman break; 1085ab4382d2SGreg Kroah-Hartman } 1086ab4382d2SGreg Kroah-Hartman 1087ab4382d2SGreg Kroah-Hartman schedule(); 1088ab4382d2SGreg Kroah-Hartman 1089ab4382d2SGreg Kroah-Hartman /* see if a signal did it */ 1090ab4382d2SGreg Kroah-Hartman if (signal_pending(current)) { 1091ab4382d2SGreg Kroah-Hartman ret = -ERESTARTSYS; 1092ab4382d2SGreg Kroah-Hartman break; 1093ab4382d2SGreg Kroah-Hartman } 1094ab4382d2SGreg Kroah-Hartman 1095ab4382d2SGreg Kroah-Hartman cprev = cnow; 1096ab4382d2SGreg Kroah-Hartman } 1097ab4382d2SGreg Kroah-Hartman 1098ab4382d2SGreg Kroah-Hartman current->state = TASK_RUNNING; 1099ab4382d2SGreg Kroah-Hartman remove_wait_queue(&port->delta_msr_wait, &wait); 1100ab4382d2SGreg Kroah-Hartman 1101ab4382d2SGreg Kroah-Hartman return ret; 1102ab4382d2SGreg Kroah-Hartman } 1103ab4382d2SGreg Kroah-Hartman 1104ab4382d2SGreg Kroah-Hartman /* 1105ab4382d2SGreg Kroah-Hartman * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) 1106ab4382d2SGreg Kroah-Hartman * Return: write counters to the user passed counter struct 1107ab4382d2SGreg Kroah-Hartman * NB: both 1->0 and 0->1 transitions are counted except for 1108ab4382d2SGreg Kroah-Hartman * RI where only 0->1 is counted. 1109ab4382d2SGreg Kroah-Hartman */ 1110ab4382d2SGreg Kroah-Hartman static int uart_get_icount(struct tty_struct *tty, 1111ab4382d2SGreg Kroah-Hartman struct serial_icounter_struct *icount) 1112ab4382d2SGreg Kroah-Hartman { 1113ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1114ab4382d2SGreg Kroah-Hartman struct uart_icount cnow; 1115ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1116ab4382d2SGreg Kroah-Hartman 1117ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1118ab4382d2SGreg Kroah-Hartman memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); 1119ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1120ab4382d2SGreg Kroah-Hartman 1121ab4382d2SGreg Kroah-Hartman icount->cts = cnow.cts; 1122ab4382d2SGreg Kroah-Hartman icount->dsr = cnow.dsr; 1123ab4382d2SGreg Kroah-Hartman icount->rng = cnow.rng; 1124ab4382d2SGreg Kroah-Hartman icount->dcd = cnow.dcd; 1125ab4382d2SGreg Kroah-Hartman icount->rx = cnow.rx; 1126ab4382d2SGreg Kroah-Hartman icount->tx = cnow.tx; 1127ab4382d2SGreg Kroah-Hartman icount->frame = cnow.frame; 1128ab4382d2SGreg Kroah-Hartman icount->overrun = cnow.overrun; 1129ab4382d2SGreg Kroah-Hartman icount->parity = cnow.parity; 1130ab4382d2SGreg Kroah-Hartman icount->brk = cnow.brk; 1131ab4382d2SGreg Kroah-Hartman icount->buf_overrun = cnow.buf_overrun; 1132ab4382d2SGreg Kroah-Hartman 1133ab4382d2SGreg Kroah-Hartman return 0; 1134ab4382d2SGreg Kroah-Hartman } 1135ab4382d2SGreg Kroah-Hartman 1136ab4382d2SGreg Kroah-Hartman /* 1137ab4382d2SGreg Kroah-Hartman * Called via sys_ioctl. We can use spin_lock_irq() here. 1138ab4382d2SGreg Kroah-Hartman */ 1139ab4382d2SGreg Kroah-Hartman static int 11406caa76b7SAlan Cox uart_ioctl(struct tty_struct *tty, unsigned int cmd, 1141ab4382d2SGreg Kroah-Hartman unsigned long arg) 1142ab4382d2SGreg Kroah-Hartman { 1143ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1144ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1145ab4382d2SGreg Kroah-Hartman void __user *uarg = (void __user *)arg; 1146ab4382d2SGreg Kroah-Hartman int ret = -ENOIOCTLCMD; 1147ab4382d2SGreg Kroah-Hartman 1148ab4382d2SGreg Kroah-Hartman 1149ab4382d2SGreg Kroah-Hartman /* 1150ab4382d2SGreg Kroah-Hartman * These ioctls don't rely on the hardware to be present. 1151ab4382d2SGreg Kroah-Hartman */ 1152ab4382d2SGreg Kroah-Hartman switch (cmd) { 1153ab4382d2SGreg Kroah-Hartman case TIOCGSERIAL: 11549f109694SAlan Cox ret = uart_get_info_user(port, uarg); 1155ab4382d2SGreg Kroah-Hartman break; 1156ab4382d2SGreg Kroah-Hartman 1157ab4382d2SGreg Kroah-Hartman case TIOCSSERIAL: 11587ba2e769SAlan Cox ret = uart_set_info_user(tty, state, uarg); 1159ab4382d2SGreg Kroah-Hartman break; 1160ab4382d2SGreg Kroah-Hartman 1161ab4382d2SGreg Kroah-Hartman case TIOCSERCONFIG: 1162ab4382d2SGreg Kroah-Hartman ret = uart_do_autoconfig(tty, state); 1163ab4382d2SGreg Kroah-Hartman break; 1164ab4382d2SGreg Kroah-Hartman 1165ab4382d2SGreg Kroah-Hartman case TIOCSERGWILD: /* obsolete */ 1166ab4382d2SGreg Kroah-Hartman case TIOCSERSWILD: /* obsolete */ 1167ab4382d2SGreg Kroah-Hartman ret = 0; 1168ab4382d2SGreg Kroah-Hartman break; 1169ab4382d2SGreg Kroah-Hartman } 1170ab4382d2SGreg Kroah-Hartman 1171ab4382d2SGreg Kroah-Hartman if (ret != -ENOIOCTLCMD) 1172ab4382d2SGreg Kroah-Hartman goto out; 1173ab4382d2SGreg Kroah-Hartman 1174ab4382d2SGreg Kroah-Hartman if (tty->flags & (1 << TTY_IO_ERROR)) { 1175ab4382d2SGreg Kroah-Hartman ret = -EIO; 1176ab4382d2SGreg Kroah-Hartman goto out; 1177ab4382d2SGreg Kroah-Hartman } 1178ab4382d2SGreg Kroah-Hartman 1179ab4382d2SGreg Kroah-Hartman /* 1180ab4382d2SGreg Kroah-Hartman * The following should only be used when hardware is present. 1181ab4382d2SGreg Kroah-Hartman */ 1182ab4382d2SGreg Kroah-Hartman switch (cmd) { 1183ab4382d2SGreg Kroah-Hartman case TIOCMIWAIT: 1184ab4382d2SGreg Kroah-Hartman ret = uart_wait_modem_status(state, arg); 1185ab4382d2SGreg Kroah-Hartman break; 1186ab4382d2SGreg Kroah-Hartman } 1187ab4382d2SGreg Kroah-Hartman 1188ab4382d2SGreg Kroah-Hartman if (ret != -ENOIOCTLCMD) 1189ab4382d2SGreg Kroah-Hartman goto out; 1190ab4382d2SGreg Kroah-Hartman 1191ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1192ab4382d2SGreg Kroah-Hartman 11936caa76b7SAlan Cox if (tty->flags & (1 << TTY_IO_ERROR)) { 1194ab4382d2SGreg Kroah-Hartman ret = -EIO; 1195ab4382d2SGreg Kroah-Hartman goto out_up; 1196ab4382d2SGreg Kroah-Hartman } 1197ab4382d2SGreg Kroah-Hartman 1198ab4382d2SGreg Kroah-Hartman /* 1199ab4382d2SGreg Kroah-Hartman * All these rely on hardware being present and need to be 1200ab4382d2SGreg Kroah-Hartman * protected against the tty being hung up. 1201ab4382d2SGreg Kroah-Hartman */ 1202ab4382d2SGreg Kroah-Hartman switch (cmd) { 1203ab4382d2SGreg Kroah-Hartman case TIOCSERGETLSR: /* Get line status register */ 1204ab4382d2SGreg Kroah-Hartman ret = uart_get_lsr_info(tty, state, uarg); 1205ab4382d2SGreg Kroah-Hartman break; 1206ab4382d2SGreg Kroah-Hartman 1207ab4382d2SGreg Kroah-Hartman default: { 1208ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1209ab4382d2SGreg Kroah-Hartman if (uport->ops->ioctl) 1210ab4382d2SGreg Kroah-Hartman ret = uport->ops->ioctl(uport, cmd, arg); 1211ab4382d2SGreg Kroah-Hartman break; 1212ab4382d2SGreg Kroah-Hartman } 1213ab4382d2SGreg Kroah-Hartman } 1214ab4382d2SGreg Kroah-Hartman out_up: 1215ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1216ab4382d2SGreg Kroah-Hartman out: 1217ab4382d2SGreg Kroah-Hartman return ret; 1218ab4382d2SGreg Kroah-Hartman } 1219ab4382d2SGreg Kroah-Hartman 1220ab4382d2SGreg Kroah-Hartman static void uart_set_ldisc(struct tty_struct *tty) 1221ab4382d2SGreg Kroah-Hartman { 1222ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1223ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1224ab4382d2SGreg Kroah-Hartman 1225ab4382d2SGreg Kroah-Hartman if (uport->ops->set_ldisc) 1226adc8d746SAlan Cox uport->ops->set_ldisc(uport, tty->termios.c_line); 1227ab4382d2SGreg Kroah-Hartman } 1228ab4382d2SGreg Kroah-Hartman 1229ab4382d2SGreg Kroah-Hartman static void uart_set_termios(struct tty_struct *tty, 1230ab4382d2SGreg Kroah-Hartman struct ktermios *old_termios) 1231ab4382d2SGreg Kroah-Hartman { 1232ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1233dec94e70SRussell King struct uart_port *uport = state->uart_port; 1234ab4382d2SGreg Kroah-Hartman unsigned long flags; 1235adc8d746SAlan Cox unsigned int cflag = tty->termios.c_cflag; 12362cbacafdSRussell King unsigned int iflag_mask = IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK; 12372cbacafdSRussell King bool sw_changed = false; 1238ab4382d2SGreg Kroah-Hartman 12392cbacafdSRussell King /* 12402cbacafdSRussell King * Drivers doing software flow control also need to know 12412cbacafdSRussell King * about changes to these input settings. 12422cbacafdSRussell King */ 12432cbacafdSRussell King if (uport->flags & UPF_SOFT_FLOW) { 12442cbacafdSRussell King iflag_mask |= IXANY|IXON|IXOFF; 12452cbacafdSRussell King sw_changed = 12462cbacafdSRussell King tty->termios.c_cc[VSTART] != old_termios->c_cc[VSTART] || 12472cbacafdSRussell King tty->termios.c_cc[VSTOP] != old_termios->c_cc[VSTOP]; 12482cbacafdSRussell King } 1249ab4382d2SGreg Kroah-Hartman 1250ab4382d2SGreg Kroah-Hartman /* 1251ab4382d2SGreg Kroah-Hartman * These are the bits that are used to setup various 1252ab4382d2SGreg Kroah-Hartman * flags in the low level driver. We can ignore the Bfoo 1253ab4382d2SGreg Kroah-Hartman * bits in c_cflag; c_[io]speed will always be set 1254ab4382d2SGreg Kroah-Hartman * appropriately by set_termios() in tty_ioctl.c 1255ab4382d2SGreg Kroah-Hartman */ 1256ab4382d2SGreg Kroah-Hartman if ((cflag ^ old_termios->c_cflag) == 0 && 1257adc8d746SAlan Cox tty->termios.c_ospeed == old_termios->c_ospeed && 1258adc8d746SAlan Cox tty->termios.c_ispeed == old_termios->c_ispeed && 12592cbacafdSRussell King ((tty->termios.c_iflag ^ old_termios->c_iflag) & iflag_mask) == 0 && 12602cbacafdSRussell King !sw_changed) { 1261ab4382d2SGreg Kroah-Hartman return; 1262ab4382d2SGreg Kroah-Hartman } 1263ab4382d2SGreg Kroah-Hartman 1264ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, old_termios); 1265ab4382d2SGreg Kroah-Hartman 1266ab4382d2SGreg Kroah-Hartman /* Handle transition to B0 status */ 1267ab4382d2SGreg Kroah-Hartman if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) 1268dec94e70SRussell King uart_clear_mctrl(uport, TIOCM_RTS | TIOCM_DTR); 1269ab4382d2SGreg Kroah-Hartman /* Handle transition away from B0 status */ 1270ab4382d2SGreg Kroah-Hartman else if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { 1271ab4382d2SGreg Kroah-Hartman unsigned int mask = TIOCM_DTR; 1272ab4382d2SGreg Kroah-Hartman if (!(cflag & CRTSCTS) || 1273ab4382d2SGreg Kroah-Hartman !test_bit(TTY_THROTTLED, &tty->flags)) 1274ab4382d2SGreg Kroah-Hartman mask |= TIOCM_RTS; 1275dec94e70SRussell King uart_set_mctrl(uport, mask); 1276ab4382d2SGreg Kroah-Hartman } 1277ab4382d2SGreg Kroah-Hartman 1278dba05832SRussell King /* 1279dba05832SRussell King * If the port is doing h/w assisted flow control, do nothing. 1280dba05832SRussell King * We assume that tty->hw_stopped has never been set. 1281dba05832SRussell King */ 1282dba05832SRussell King if (uport->flags & UPF_HARD_FLOW) 1283dba05832SRussell King return; 1284dba05832SRussell King 1285ab4382d2SGreg Kroah-Hartman /* Handle turning off CRTSCTS */ 1286ab4382d2SGreg Kroah-Hartman if ((old_termios->c_cflag & CRTSCTS) && !(cflag & CRTSCTS)) { 1287dec94e70SRussell King spin_lock_irqsave(&uport->lock, flags); 1288ab4382d2SGreg Kroah-Hartman tty->hw_stopped = 0; 1289ab4382d2SGreg Kroah-Hartman __uart_start(tty); 1290dec94e70SRussell King spin_unlock_irqrestore(&uport->lock, flags); 1291ab4382d2SGreg Kroah-Hartman } 1292ab4382d2SGreg Kroah-Hartman /* Handle turning on CRTSCTS */ 1293ab4382d2SGreg Kroah-Hartman else if (!(old_termios->c_cflag & CRTSCTS) && (cflag & CRTSCTS)) { 1294dec94e70SRussell King spin_lock_irqsave(&uport->lock, flags); 1295dec94e70SRussell King if (!(uport->ops->get_mctrl(uport) & TIOCM_CTS)) { 1296ab4382d2SGreg Kroah-Hartman tty->hw_stopped = 1; 1297dec94e70SRussell King uport->ops->stop_tx(uport); 1298ab4382d2SGreg Kroah-Hartman } 1299dec94e70SRussell King spin_unlock_irqrestore(&uport->lock, flags); 1300ab4382d2SGreg Kroah-Hartman } 1301ab4382d2SGreg Kroah-Hartman } 1302ab4382d2SGreg Kroah-Hartman 1303ab4382d2SGreg Kroah-Hartman /* 1304ef4f527cSKevin Cernekee * Calls to uart_close() are serialised via the tty_lock in 1305ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:tty_release() 1306ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:do_tty_hangup() 1307ef4f527cSKevin Cernekee * This runs from a workqueue and can sleep for a _short_ time only. 1308ab4382d2SGreg Kroah-Hartman */ 1309ab4382d2SGreg Kroah-Hartman static void uart_close(struct tty_struct *tty, struct file *filp) 1310ab4382d2SGreg Kroah-Hartman { 1311ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1312ab4382d2SGreg Kroah-Hartman struct tty_port *port; 1313ab4382d2SGreg Kroah-Hartman struct uart_port *uport; 1314ab4382d2SGreg Kroah-Hartman unsigned long flags; 1315ab4382d2SGreg Kroah-Hartman 1316ab4382d2SGreg Kroah-Hartman if (!state) 1317ab4382d2SGreg Kroah-Hartman return; 1318ab4382d2SGreg Kroah-Hartman 1319ab4382d2SGreg Kroah-Hartman uport = state->uart_port; 1320ab4382d2SGreg Kroah-Hartman port = &state->port; 1321ab4382d2SGreg Kroah-Hartman 1322ab4382d2SGreg Kroah-Hartman pr_debug("uart_close(%d) called\n", uport->line); 1323ab4382d2SGreg Kroah-Hartman 1324d30ccf08SJiri Slaby if (tty_port_close_start(port, tty, filp) == 0) 132555956216SNobuhiro Iwamatsu return; 1326ab4382d2SGreg Kroah-Hartman 1327ab4382d2SGreg Kroah-Hartman /* 1328ab4382d2SGreg Kroah-Hartman * At this point, we stop accepting input. To do this, we 1329ab4382d2SGreg Kroah-Hartman * disable the receive line status interrupts. 1330ab4382d2SGreg Kroah-Hartman */ 1331ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_INITIALIZED) { 1332ab4382d2SGreg Kroah-Hartman unsigned long flags; 1333ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&uport->lock, flags); 1334ab4382d2SGreg Kroah-Hartman uport->ops->stop_rx(uport); 1335ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&uport->lock, flags); 1336ab4382d2SGreg Kroah-Hartman /* 1337ab4382d2SGreg Kroah-Hartman * Before we drop DTR, make sure the UART transmitter 1338ab4382d2SGreg Kroah-Hartman * has completely drained; this is especially 1339ab4382d2SGreg Kroah-Hartman * important if there is a transmit FIFO! 1340ab4382d2SGreg Kroah-Hartman */ 13411f33a51dSJiri Slaby uart_wait_until_sent(tty, uport->timeout); 1342ab4382d2SGreg Kroah-Hartman } 1343ab4382d2SGreg Kroah-Hartman 1344bafb0bd2SJiri Slaby mutex_lock(&port->mutex); 1345ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 1346ab4382d2SGreg Kroah-Hartman uart_flush_buffer(tty); 1347ab4382d2SGreg Kroah-Hartman 1348ab4382d2SGreg Kroah-Hartman tty_ldisc_flush(tty); 1349ab4382d2SGreg Kroah-Hartman 1350ab4382d2SGreg Kroah-Hartman tty_port_tty_set(port, NULL); 1351ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 1352ab4382d2SGreg Kroah-Hartman tty->closing = 0; 1353ab4382d2SGreg Kroah-Hartman 1354ab4382d2SGreg Kroah-Hartman if (port->blocked_open) { 1355ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 1356ab4382d2SGreg Kroah-Hartman if (port->close_delay) 13574cb0fbfdSJiri Slaby msleep_interruptible( 13584cb0fbfdSJiri Slaby jiffies_to_msecs(port->close_delay)); 1359ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 1360ab4382d2SGreg Kroah-Hartman } else if (!uart_console(uport)) { 1361ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 13626f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_OFF); 1363ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 1364ab4382d2SGreg Kroah-Hartman } 1365ab4382d2SGreg Kroah-Hartman 1366ab4382d2SGreg Kroah-Hartman /* 1367ab4382d2SGreg Kroah-Hartman * Wake up anyone trying to open this port. 1368ab4382d2SGreg Kroah-Hartman */ 1369ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); 1370426929f8SJiri Slaby clear_bit(ASYNCB_CLOSING, &port->flags); 1371ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 1372ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->open_wait); 1373426929f8SJiri Slaby wake_up_interruptible(&port->close_wait); 1374ab4382d2SGreg Kroah-Hartman 1375ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1376ab4382d2SGreg Kroah-Hartman } 1377ab4382d2SGreg Kroah-Hartman 13781f33a51dSJiri Slaby static void uart_wait_until_sent(struct tty_struct *tty, int timeout) 1379ab4382d2SGreg Kroah-Hartman { 13801f33a51dSJiri Slaby struct uart_state *state = tty->driver_data; 13811f33a51dSJiri Slaby struct uart_port *port = state->uart_port; 1382ab4382d2SGreg Kroah-Hartman unsigned long char_time, expire; 1383ab4382d2SGreg Kroah-Hartman 1384ab4382d2SGreg Kroah-Hartman if (port->type == PORT_UNKNOWN || port->fifosize == 0) 1385ab4382d2SGreg Kroah-Hartman return; 1386ab4382d2SGreg Kroah-Hartman 1387ab4382d2SGreg Kroah-Hartman /* 1388ab4382d2SGreg Kroah-Hartman * Set the check interval to be 1/5 of the estimated time to 1389ab4382d2SGreg Kroah-Hartman * send a single character, and make it at least 1. The check 1390ab4382d2SGreg Kroah-Hartman * interval should also be less than the timeout. 1391ab4382d2SGreg Kroah-Hartman * 1392ab4382d2SGreg Kroah-Hartman * Note: we have to use pretty tight timings here to satisfy 1393ab4382d2SGreg Kroah-Hartman * the NIST-PCTS. 1394ab4382d2SGreg Kroah-Hartman */ 1395ab4382d2SGreg Kroah-Hartman char_time = (port->timeout - HZ/50) / port->fifosize; 1396ab4382d2SGreg Kroah-Hartman char_time = char_time / 5; 1397ab4382d2SGreg Kroah-Hartman if (char_time == 0) 1398ab4382d2SGreg Kroah-Hartman char_time = 1; 1399ab4382d2SGreg Kroah-Hartman if (timeout && timeout < char_time) 1400ab4382d2SGreg Kroah-Hartman char_time = timeout; 1401ab4382d2SGreg Kroah-Hartman 1402ab4382d2SGreg Kroah-Hartman /* 1403ab4382d2SGreg Kroah-Hartman * If the transmitter hasn't cleared in twice the approximate 1404ab4382d2SGreg Kroah-Hartman * amount of time to send the entire FIFO, it probably won't 1405ab4382d2SGreg Kroah-Hartman * ever clear. This assumes the UART isn't doing flow 1406ab4382d2SGreg Kroah-Hartman * control, which is currently the case. Hence, if it ever 1407ab4382d2SGreg Kroah-Hartman * takes longer than port->timeout, this is probably due to a 1408ab4382d2SGreg Kroah-Hartman * UART bug of some kind. So, we clamp the timeout parameter at 1409ab4382d2SGreg Kroah-Hartman * 2*port->timeout. 1410ab4382d2SGreg Kroah-Hartman */ 1411ab4382d2SGreg Kroah-Hartman if (timeout == 0 || timeout > 2 * port->timeout) 1412ab4382d2SGreg Kroah-Hartman timeout = 2 * port->timeout; 1413ab4382d2SGreg Kroah-Hartman 1414ab4382d2SGreg Kroah-Hartman expire = jiffies + timeout; 1415ab4382d2SGreg Kroah-Hartman 1416ab4382d2SGreg Kroah-Hartman pr_debug("uart_wait_until_sent(%d), jiffies=%lu, expire=%lu...\n", 1417ab4382d2SGreg Kroah-Hartman port->line, jiffies, expire); 1418ab4382d2SGreg Kroah-Hartman 1419ab4382d2SGreg Kroah-Hartman /* 1420ab4382d2SGreg Kroah-Hartman * Check whether the transmitter is empty every 'char_time'. 1421ab4382d2SGreg Kroah-Hartman * 'timeout' / 'expire' give us the maximum amount of time 1422ab4382d2SGreg Kroah-Hartman * we wait. 1423ab4382d2SGreg Kroah-Hartman */ 1424ab4382d2SGreg Kroah-Hartman while (!port->ops->tx_empty(port)) { 1425ab4382d2SGreg Kroah-Hartman msleep_interruptible(jiffies_to_msecs(char_time)); 1426ab4382d2SGreg Kroah-Hartman if (signal_pending(current)) 1427ab4382d2SGreg Kroah-Hartman break; 1428ab4382d2SGreg Kroah-Hartman if (time_after(jiffies, expire)) 1429ab4382d2SGreg Kroah-Hartman break; 1430ab4382d2SGreg Kroah-Hartman } 1431ab4382d2SGreg Kroah-Hartman } 1432ab4382d2SGreg Kroah-Hartman 1433ab4382d2SGreg Kroah-Hartman /* 1434ef4f527cSKevin Cernekee * Calls to uart_hangup() are serialised by the tty_lock in 1435ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:do_tty_hangup() 1436ef4f527cSKevin Cernekee * This runs from a workqueue and can sleep for a _short_ time only. 1437ab4382d2SGreg Kroah-Hartman */ 1438ab4382d2SGreg Kroah-Hartman static void uart_hangup(struct tty_struct *tty) 1439ab4382d2SGreg Kroah-Hartman { 1440ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1441ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1442ab4382d2SGreg Kroah-Hartman unsigned long flags; 1443ab4382d2SGreg Kroah-Hartman 1444ab4382d2SGreg Kroah-Hartman pr_debug("uart_hangup(%d)\n", state->uart_port->line); 1445ab4382d2SGreg Kroah-Hartman 1446ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1447ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_NORMAL_ACTIVE) { 1448ab4382d2SGreg Kroah-Hartman uart_flush_buffer(tty); 1449ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 1450ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 1451ab4382d2SGreg Kroah-Hartman port->count = 0; 1452ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); 1453ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 1454ab4382d2SGreg Kroah-Hartman tty_port_tty_set(port, NULL); 1455ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->open_wait); 1456ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->delta_msr_wait); 1457ab4382d2SGreg Kroah-Hartman } 1458ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1459ab4382d2SGreg Kroah-Hartman } 1460ab4382d2SGreg Kroah-Hartman 14610b1db830SJiri Slaby static int uart_port_activate(struct tty_port *port, struct tty_struct *tty) 14620b1db830SJiri Slaby { 14630b1db830SJiri Slaby return 0; 14640b1db830SJiri Slaby } 14650b1db830SJiri Slaby 14660b1db830SJiri Slaby static void uart_port_shutdown(struct tty_port *port) 14670b1db830SJiri Slaby { 1468b922e19dSJiri Slaby struct uart_state *state = container_of(port, struct uart_state, port); 1469b922e19dSJiri Slaby struct uart_port *uport = state->uart_port; 1470b922e19dSJiri Slaby 1471b922e19dSJiri Slaby /* 1472b922e19dSJiri Slaby * clear delta_msr_wait queue to avoid mem leaks: we may free 1473b922e19dSJiri Slaby * the irq here so the queue might never be woken up. Note 1474b922e19dSJiri Slaby * that we won't end up waiting on delta_msr_wait again since 1475b922e19dSJiri Slaby * any outstanding file descriptors should be pointing at 1476b922e19dSJiri Slaby * hung_up_tty_fops now. 1477b922e19dSJiri Slaby */ 1478b922e19dSJiri Slaby wake_up_interruptible(&port->delta_msr_wait); 1479b922e19dSJiri Slaby 1480b922e19dSJiri Slaby /* 1481b922e19dSJiri Slaby * Free the IRQ and disable the port. 1482b922e19dSJiri Slaby */ 1483b922e19dSJiri Slaby uport->ops->shutdown(uport); 1484b922e19dSJiri Slaby 1485b922e19dSJiri Slaby /* 1486b922e19dSJiri Slaby * Ensure that the IRQ handler isn't running on another CPU. 1487b922e19dSJiri Slaby */ 1488b922e19dSJiri Slaby synchronize_irq(uport->irq); 14890b1db830SJiri Slaby } 14900b1db830SJiri Slaby 1491ab4382d2SGreg Kroah-Hartman static int uart_carrier_raised(struct tty_port *port) 1492ab4382d2SGreg Kroah-Hartman { 1493ab4382d2SGreg Kroah-Hartman struct uart_state *state = container_of(port, struct uart_state, port); 1494ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1495ab4382d2SGreg Kroah-Hartman int mctrl; 1496ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1497ab4382d2SGreg Kroah-Hartman uport->ops->enable_ms(uport); 1498ab4382d2SGreg Kroah-Hartman mctrl = uport->ops->get_mctrl(uport); 1499ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1500ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_CAR) 1501ab4382d2SGreg Kroah-Hartman return 1; 1502ab4382d2SGreg Kroah-Hartman return 0; 1503ab4382d2SGreg Kroah-Hartman } 1504ab4382d2SGreg Kroah-Hartman 1505ab4382d2SGreg Kroah-Hartman static void uart_dtr_rts(struct tty_port *port, int onoff) 1506ab4382d2SGreg Kroah-Hartman { 1507ab4382d2SGreg Kroah-Hartman struct uart_state *state = container_of(port, struct uart_state, port); 1508ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1509ab4382d2SGreg Kroah-Hartman 15106f5c24adSJiri Slaby if (onoff) 1511ab4382d2SGreg Kroah-Hartman uart_set_mctrl(uport, TIOCM_DTR | TIOCM_RTS); 1512ab4382d2SGreg Kroah-Hartman else 1513ab4382d2SGreg Kroah-Hartman uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); 1514ab4382d2SGreg Kroah-Hartman } 1515ab4382d2SGreg Kroah-Hartman 1516ab4382d2SGreg Kroah-Hartman /* 1517ef4f527cSKevin Cernekee * Calls to uart_open are serialised by the tty_lock in 1518ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:tty_open() 1519ab4382d2SGreg Kroah-Hartman * Note that if this fails, then uart_close() _will_ be called. 1520ab4382d2SGreg Kroah-Hartman * 1521ab4382d2SGreg Kroah-Hartman * In time, we want to scrap the "opening nonpresent ports" 1522ab4382d2SGreg Kroah-Hartman * behaviour and implement an alternative way for setserial 1523ab4382d2SGreg Kroah-Hartman * to set base addresses/ports/types. This will allow us to 1524ab4382d2SGreg Kroah-Hartman * get rid of a certain amount of extra tests. 1525ab4382d2SGreg Kroah-Hartman */ 1526ab4382d2SGreg Kroah-Hartman static int uart_open(struct tty_struct *tty, struct file *filp) 1527ab4382d2SGreg Kroah-Hartman { 1528ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = (struct uart_driver *)tty->driver->driver_state; 1529ab4382d2SGreg Kroah-Hartman int retval, line = tty->index; 15301c7b13c4SJiri Slaby struct uart_state *state = drv->state + line; 15311c7b13c4SJiri Slaby struct tty_port *port = &state->port; 1532ab4382d2SGreg Kroah-Hartman 1533ab4382d2SGreg Kroah-Hartman pr_debug("uart_open(%d) called\n", line); 1534ab4382d2SGreg Kroah-Hartman 1535ab4382d2SGreg Kroah-Hartman /* 15361c7b13c4SJiri Slaby * We take the semaphore here to guarantee that we won't be re-entered 15371c7b13c4SJiri Slaby * while allocating the state structure, or while we request any IRQs 15381c7b13c4SJiri Slaby * that the driver may need. This also has the nice side-effect that 15391c7b13c4SJiri Slaby * it delays the action of uart_hangup, so we can guarantee that 15401c7b13c4SJiri Slaby * state->port.tty will always contain something reasonable. 1541ab4382d2SGreg Kroah-Hartman */ 15421c7b13c4SJiri Slaby if (mutex_lock_interruptible(&port->mutex)) { 15431c7b13c4SJiri Slaby retval = -ERESTARTSYS; 15441c7b13c4SJiri Slaby goto end; 1545ab4382d2SGreg Kroah-Hartman } 15461c7b13c4SJiri Slaby 15471c7b13c4SJiri Slaby port->count++; 15481c7b13c4SJiri Slaby if (!state->uart_port || state->uart_port->flags & UPF_DEAD) { 15491c7b13c4SJiri Slaby retval = -ENXIO; 15501c7b13c4SJiri Slaby goto err_dec_count; 15511c7b13c4SJiri Slaby } 1552ab4382d2SGreg Kroah-Hartman 1553ab4382d2SGreg Kroah-Hartman /* 1554ab4382d2SGreg Kroah-Hartman * Once we set tty->driver_data here, we are guaranteed that 1555ab4382d2SGreg Kroah-Hartman * uart_close() will decrement the driver module use count. 1556ab4382d2SGreg Kroah-Hartman * Any failures from here onwards should not touch the count. 1557ab4382d2SGreg Kroah-Hartman */ 1558ab4382d2SGreg Kroah-Hartman tty->driver_data = state; 1559ab4382d2SGreg Kroah-Hartman state->uart_port->state = state; 1560d6c53c0eSJiri Slaby state->port.low_latency = 1561d6c53c0eSJiri Slaby (state->uart_port->flags & UPF_LOW_LATENCY) ? 1 : 0; 1562ab4382d2SGreg Kroah-Hartman tty_port_tty_set(port, tty); 1563ab4382d2SGreg Kroah-Hartman 1564ab4382d2SGreg Kroah-Hartman /* 1565ab4382d2SGreg Kroah-Hartman * If the port is in the middle of closing, bail out now. 1566ab4382d2SGreg Kroah-Hartman */ 1567ab4382d2SGreg Kroah-Hartman if (tty_hung_up_p(filp)) { 1568ab4382d2SGreg Kroah-Hartman retval = -EAGAIN; 15691c7b13c4SJiri Slaby goto err_dec_count; 1570ab4382d2SGreg Kroah-Hartman } 1571ab4382d2SGreg Kroah-Hartman 1572ab4382d2SGreg Kroah-Hartman /* 1573ab4382d2SGreg Kroah-Hartman * Make sure the device is in D0 state. 1574ab4382d2SGreg Kroah-Hartman */ 1575ab4382d2SGreg Kroah-Hartman if (port->count == 1) 15766f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 1577ab4382d2SGreg Kroah-Hartman 1578ab4382d2SGreg Kroah-Hartman /* 1579ab4382d2SGreg Kroah-Hartman * Start up the serial port. 1580ab4382d2SGreg Kroah-Hartman */ 1581ab4382d2SGreg Kroah-Hartman retval = uart_startup(tty, state, 0); 1582ab4382d2SGreg Kroah-Hartman 1583ab4382d2SGreg Kroah-Hartman /* 1584ab4382d2SGreg Kroah-Hartman * If we succeeded, wait until the port is ready. 1585ab4382d2SGreg Kroah-Hartman */ 1586ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1587ab4382d2SGreg Kroah-Hartman if (retval == 0) 1588ab4382d2SGreg Kroah-Hartman retval = tty_port_block_til_ready(port, tty, filp); 1589ab4382d2SGreg Kroah-Hartman 15901c7b13c4SJiri Slaby end: 1591ab4382d2SGreg Kroah-Hartman return retval; 15921c7b13c4SJiri Slaby err_dec_count: 15931c7b13c4SJiri Slaby port->count--; 15941c7b13c4SJiri Slaby mutex_unlock(&port->mutex); 15951c7b13c4SJiri Slaby goto end; 1596ab4382d2SGreg Kroah-Hartman } 1597ab4382d2SGreg Kroah-Hartman 1598ab4382d2SGreg Kroah-Hartman static const char *uart_type(struct uart_port *port) 1599ab4382d2SGreg Kroah-Hartman { 1600ab4382d2SGreg Kroah-Hartman const char *str = NULL; 1601ab4382d2SGreg Kroah-Hartman 1602ab4382d2SGreg Kroah-Hartman if (port->ops->type) 1603ab4382d2SGreg Kroah-Hartman str = port->ops->type(port); 1604ab4382d2SGreg Kroah-Hartman 1605ab4382d2SGreg Kroah-Hartman if (!str) 1606ab4382d2SGreg Kroah-Hartman str = "unknown"; 1607ab4382d2SGreg Kroah-Hartman 1608ab4382d2SGreg Kroah-Hartman return str; 1609ab4382d2SGreg Kroah-Hartman } 1610ab4382d2SGreg Kroah-Hartman 1611ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_PROC_FS 1612ab4382d2SGreg Kroah-Hartman 1613ab4382d2SGreg Kroah-Hartman static void uart_line_info(struct seq_file *m, struct uart_driver *drv, int i) 1614ab4382d2SGreg Kroah-Hartman { 1615ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + i; 1616ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 16176f538fe3SLinus Walleij enum uart_pm_state pm_state; 1618ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1619ab4382d2SGreg Kroah-Hartman char stat_buf[32]; 1620ab4382d2SGreg Kroah-Hartman unsigned int status; 1621ab4382d2SGreg Kroah-Hartman int mmio; 1622ab4382d2SGreg Kroah-Hartman 1623ab4382d2SGreg Kroah-Hartman if (!uport) 1624ab4382d2SGreg Kroah-Hartman return; 1625ab4382d2SGreg Kroah-Hartman 1626ab4382d2SGreg Kroah-Hartman mmio = uport->iotype >= UPIO_MEM; 1627ab4382d2SGreg Kroah-Hartman seq_printf(m, "%d: uart:%s %s%08llX irq:%d", 1628ab4382d2SGreg Kroah-Hartman uport->line, uart_type(uport), 1629ab4382d2SGreg Kroah-Hartman mmio ? "mmio:0x" : "port:", 1630ab4382d2SGreg Kroah-Hartman mmio ? (unsigned long long)uport->mapbase 1631ab4382d2SGreg Kroah-Hartman : (unsigned long long)uport->iobase, 1632ab4382d2SGreg Kroah-Hartman uport->irq); 1633ab4382d2SGreg Kroah-Hartman 1634ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) { 1635ab4382d2SGreg Kroah-Hartman seq_putc(m, '\n'); 1636ab4382d2SGreg Kroah-Hartman return; 1637ab4382d2SGreg Kroah-Hartman } 1638ab4382d2SGreg Kroah-Hartman 1639ab4382d2SGreg Kroah-Hartman if (capable(CAP_SYS_ADMIN)) { 1640ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1641ab4382d2SGreg Kroah-Hartman pm_state = state->pm_state; 16426f538fe3SLinus Walleij if (pm_state != UART_PM_STATE_ON) 16436f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 1644ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1645ab4382d2SGreg Kroah-Hartman status = uport->ops->get_mctrl(uport); 1646ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 16476f538fe3SLinus Walleij if (pm_state != UART_PM_STATE_ON) 1648ab4382d2SGreg Kroah-Hartman uart_change_pm(state, pm_state); 1649ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1650ab4382d2SGreg Kroah-Hartman 1651ab4382d2SGreg Kroah-Hartman seq_printf(m, " tx:%d rx:%d", 1652ab4382d2SGreg Kroah-Hartman uport->icount.tx, uport->icount.rx); 1653ab4382d2SGreg Kroah-Hartman if (uport->icount.frame) 1654ab4382d2SGreg Kroah-Hartman seq_printf(m, " fe:%d", 1655ab4382d2SGreg Kroah-Hartman uport->icount.frame); 1656ab4382d2SGreg Kroah-Hartman if (uport->icount.parity) 1657ab4382d2SGreg Kroah-Hartman seq_printf(m, " pe:%d", 1658ab4382d2SGreg Kroah-Hartman uport->icount.parity); 1659ab4382d2SGreg Kroah-Hartman if (uport->icount.brk) 1660ab4382d2SGreg Kroah-Hartman seq_printf(m, " brk:%d", 1661ab4382d2SGreg Kroah-Hartman uport->icount.brk); 1662ab4382d2SGreg Kroah-Hartman if (uport->icount.overrun) 1663ab4382d2SGreg Kroah-Hartman seq_printf(m, " oe:%d", 1664ab4382d2SGreg Kroah-Hartman uport->icount.overrun); 1665ab4382d2SGreg Kroah-Hartman 1666ab4382d2SGreg Kroah-Hartman #define INFOBIT(bit, str) \ 1667ab4382d2SGreg Kroah-Hartman if (uport->mctrl & (bit)) \ 1668ab4382d2SGreg Kroah-Hartman strncat(stat_buf, (str), sizeof(stat_buf) - \ 1669ab4382d2SGreg Kroah-Hartman strlen(stat_buf) - 2) 1670ab4382d2SGreg Kroah-Hartman #define STATBIT(bit, str) \ 1671ab4382d2SGreg Kroah-Hartman if (status & (bit)) \ 1672ab4382d2SGreg Kroah-Hartman strncat(stat_buf, (str), sizeof(stat_buf) - \ 1673ab4382d2SGreg Kroah-Hartman strlen(stat_buf) - 2) 1674ab4382d2SGreg Kroah-Hartman 1675ab4382d2SGreg Kroah-Hartman stat_buf[0] = '\0'; 1676ab4382d2SGreg Kroah-Hartman stat_buf[1] = '\0'; 1677ab4382d2SGreg Kroah-Hartman INFOBIT(TIOCM_RTS, "|RTS"); 1678ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_CTS, "|CTS"); 1679ab4382d2SGreg Kroah-Hartman INFOBIT(TIOCM_DTR, "|DTR"); 1680ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_DSR, "|DSR"); 1681ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_CAR, "|CD"); 1682ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_RNG, "|RI"); 1683ab4382d2SGreg Kroah-Hartman if (stat_buf[0]) 1684ab4382d2SGreg Kroah-Hartman stat_buf[0] = ' '; 1685ab4382d2SGreg Kroah-Hartman 1686ab4382d2SGreg Kroah-Hartman seq_puts(m, stat_buf); 1687ab4382d2SGreg Kroah-Hartman } 1688ab4382d2SGreg Kroah-Hartman seq_putc(m, '\n'); 1689ab4382d2SGreg Kroah-Hartman #undef STATBIT 1690ab4382d2SGreg Kroah-Hartman #undef INFOBIT 1691ab4382d2SGreg Kroah-Hartman } 1692ab4382d2SGreg Kroah-Hartman 1693ab4382d2SGreg Kroah-Hartman static int uart_proc_show(struct seq_file *m, void *v) 1694ab4382d2SGreg Kroah-Hartman { 1695ab4382d2SGreg Kroah-Hartman struct tty_driver *ttydrv = m->private; 1696ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = ttydrv->driver_state; 1697ab4382d2SGreg Kroah-Hartman int i; 1698ab4382d2SGreg Kroah-Hartman 1699ab4382d2SGreg Kroah-Hartman seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n", 1700ab4382d2SGreg Kroah-Hartman "", "", ""); 1701ab4382d2SGreg Kroah-Hartman for (i = 0; i < drv->nr; i++) 1702ab4382d2SGreg Kroah-Hartman uart_line_info(m, drv, i); 1703ab4382d2SGreg Kroah-Hartman return 0; 1704ab4382d2SGreg Kroah-Hartman } 1705ab4382d2SGreg Kroah-Hartman 1706ab4382d2SGreg Kroah-Hartman static int uart_proc_open(struct inode *inode, struct file *file) 1707ab4382d2SGreg Kroah-Hartman { 1708d9dda78bSAl Viro return single_open(file, uart_proc_show, PDE_DATA(inode)); 1709ab4382d2SGreg Kroah-Hartman } 1710ab4382d2SGreg Kroah-Hartman 1711ab4382d2SGreg Kroah-Hartman static const struct file_operations uart_proc_fops = { 1712ab4382d2SGreg Kroah-Hartman .owner = THIS_MODULE, 1713ab4382d2SGreg Kroah-Hartman .open = uart_proc_open, 1714ab4382d2SGreg Kroah-Hartman .read = seq_read, 1715ab4382d2SGreg Kroah-Hartman .llseek = seq_lseek, 1716ab4382d2SGreg Kroah-Hartman .release = single_release, 1717ab4382d2SGreg Kroah-Hartman }; 1718ab4382d2SGreg Kroah-Hartman #endif 1719ab4382d2SGreg Kroah-Hartman 1720ab4382d2SGreg Kroah-Hartman #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL) 1721ab4382d2SGreg Kroah-Hartman /* 1722ab4382d2SGreg Kroah-Hartman * uart_console_write - write a console message to a serial port 1723ab4382d2SGreg Kroah-Hartman * @port: the port to write the message 1724ab4382d2SGreg Kroah-Hartman * @s: array of characters 1725ab4382d2SGreg Kroah-Hartman * @count: number of characters in string to write 1726ab4382d2SGreg Kroah-Hartman * @write: function to write character to port 1727ab4382d2SGreg Kroah-Hartman */ 1728ab4382d2SGreg Kroah-Hartman void uart_console_write(struct uart_port *port, const char *s, 1729ab4382d2SGreg Kroah-Hartman unsigned int count, 1730ab4382d2SGreg Kroah-Hartman void (*putchar)(struct uart_port *, int)) 1731ab4382d2SGreg Kroah-Hartman { 1732ab4382d2SGreg Kroah-Hartman unsigned int i; 1733ab4382d2SGreg Kroah-Hartman 1734ab4382d2SGreg Kroah-Hartman for (i = 0; i < count; i++, s++) { 1735ab4382d2SGreg Kroah-Hartman if (*s == '\n') 1736ab4382d2SGreg Kroah-Hartman putchar(port, '\r'); 1737ab4382d2SGreg Kroah-Hartman putchar(port, *s); 1738ab4382d2SGreg Kroah-Hartman } 1739ab4382d2SGreg Kroah-Hartman } 1740ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_console_write); 1741ab4382d2SGreg Kroah-Hartman 1742ab4382d2SGreg Kroah-Hartman /* 1743ab4382d2SGreg Kroah-Hartman * Check whether an invalid uart number has been specified, and 1744ab4382d2SGreg Kroah-Hartman * if so, search for the first available port that does have 1745ab4382d2SGreg Kroah-Hartman * console support. 1746ab4382d2SGreg Kroah-Hartman */ 1747ab4382d2SGreg Kroah-Hartman struct uart_port * __init 1748ab4382d2SGreg Kroah-Hartman uart_get_console(struct uart_port *ports, int nr, struct console *co) 1749ab4382d2SGreg Kroah-Hartman { 1750ab4382d2SGreg Kroah-Hartman int idx = co->index; 1751ab4382d2SGreg Kroah-Hartman 1752ab4382d2SGreg Kroah-Hartman if (idx < 0 || idx >= nr || (ports[idx].iobase == 0 && 1753ab4382d2SGreg Kroah-Hartman ports[idx].membase == NULL)) 1754ab4382d2SGreg Kroah-Hartman for (idx = 0; idx < nr; idx++) 1755ab4382d2SGreg Kroah-Hartman if (ports[idx].iobase != 0 || 1756ab4382d2SGreg Kroah-Hartman ports[idx].membase != NULL) 1757ab4382d2SGreg Kroah-Hartman break; 1758ab4382d2SGreg Kroah-Hartman 1759ab4382d2SGreg Kroah-Hartman co->index = idx; 1760ab4382d2SGreg Kroah-Hartman 1761ab4382d2SGreg Kroah-Hartman return ports + idx; 1762ab4382d2SGreg Kroah-Hartman } 1763ab4382d2SGreg Kroah-Hartman 1764ab4382d2SGreg Kroah-Hartman /** 1765ab4382d2SGreg Kroah-Hartman * uart_parse_options - Parse serial port baud/parity/bits/flow contro. 1766ab4382d2SGreg Kroah-Hartman * @options: pointer to option string 1767ab4382d2SGreg Kroah-Hartman * @baud: pointer to an 'int' variable for the baud rate. 1768ab4382d2SGreg Kroah-Hartman * @parity: pointer to an 'int' variable for the parity. 1769ab4382d2SGreg Kroah-Hartman * @bits: pointer to an 'int' variable for the number of data bits. 1770ab4382d2SGreg Kroah-Hartman * @flow: pointer to an 'int' variable for the flow control character. 1771ab4382d2SGreg Kroah-Hartman * 1772ab4382d2SGreg Kroah-Hartman * uart_parse_options decodes a string containing the serial console 1773ab4382d2SGreg Kroah-Hartman * options. The format of the string is <baud><parity><bits><flow>, 1774ab4382d2SGreg Kroah-Hartman * eg: 115200n8r 1775ab4382d2SGreg Kroah-Hartman */ 1776ab4382d2SGreg Kroah-Hartman void 1777ab4382d2SGreg Kroah-Hartman uart_parse_options(char *options, int *baud, int *parity, int *bits, int *flow) 1778ab4382d2SGreg Kroah-Hartman { 1779ab4382d2SGreg Kroah-Hartman char *s = options; 1780ab4382d2SGreg Kroah-Hartman 1781ab4382d2SGreg Kroah-Hartman *baud = simple_strtoul(s, NULL, 10); 1782ab4382d2SGreg Kroah-Hartman while (*s >= '0' && *s <= '9') 1783ab4382d2SGreg Kroah-Hartman s++; 1784ab4382d2SGreg Kroah-Hartman if (*s) 1785ab4382d2SGreg Kroah-Hartman *parity = *s++; 1786ab4382d2SGreg Kroah-Hartman if (*s) 1787ab4382d2SGreg Kroah-Hartman *bits = *s++ - '0'; 1788ab4382d2SGreg Kroah-Hartman if (*s) 1789ab4382d2SGreg Kroah-Hartman *flow = *s; 1790ab4382d2SGreg Kroah-Hartman } 1791ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_parse_options); 1792ab4382d2SGreg Kroah-Hartman 1793ab4382d2SGreg Kroah-Hartman struct baud_rates { 1794ab4382d2SGreg Kroah-Hartman unsigned int rate; 1795ab4382d2SGreg Kroah-Hartman unsigned int cflag; 1796ab4382d2SGreg Kroah-Hartman }; 1797ab4382d2SGreg Kroah-Hartman 1798ab4382d2SGreg Kroah-Hartman static const struct baud_rates baud_rates[] = { 1799ab4382d2SGreg Kroah-Hartman { 921600, B921600 }, 1800ab4382d2SGreg Kroah-Hartman { 460800, B460800 }, 1801ab4382d2SGreg Kroah-Hartman { 230400, B230400 }, 1802ab4382d2SGreg Kroah-Hartman { 115200, B115200 }, 1803ab4382d2SGreg Kroah-Hartman { 57600, B57600 }, 1804ab4382d2SGreg Kroah-Hartman { 38400, B38400 }, 1805ab4382d2SGreg Kroah-Hartman { 19200, B19200 }, 1806ab4382d2SGreg Kroah-Hartman { 9600, B9600 }, 1807ab4382d2SGreg Kroah-Hartman { 4800, B4800 }, 1808ab4382d2SGreg Kroah-Hartman { 2400, B2400 }, 1809ab4382d2SGreg Kroah-Hartman { 1200, B1200 }, 1810ab4382d2SGreg Kroah-Hartman { 0, B38400 } 1811ab4382d2SGreg Kroah-Hartman }; 1812ab4382d2SGreg Kroah-Hartman 1813ab4382d2SGreg Kroah-Hartman /** 1814ab4382d2SGreg Kroah-Hartman * uart_set_options - setup the serial console parameters 1815ab4382d2SGreg Kroah-Hartman * @port: pointer to the serial ports uart_port structure 1816ab4382d2SGreg Kroah-Hartman * @co: console pointer 1817ab4382d2SGreg Kroah-Hartman * @baud: baud rate 1818ab4382d2SGreg Kroah-Hartman * @parity: parity character - 'n' (none), 'o' (odd), 'e' (even) 1819ab4382d2SGreg Kroah-Hartman * @bits: number of data bits 1820ab4382d2SGreg Kroah-Hartman * @flow: flow control character - 'r' (rts) 1821ab4382d2SGreg Kroah-Hartman */ 1822ab4382d2SGreg Kroah-Hartman int 1823ab4382d2SGreg Kroah-Hartman uart_set_options(struct uart_port *port, struct console *co, 1824ab4382d2SGreg Kroah-Hartman int baud, int parity, int bits, int flow) 1825ab4382d2SGreg Kroah-Hartman { 1826ab4382d2SGreg Kroah-Hartman struct ktermios termios; 1827ab4382d2SGreg Kroah-Hartman static struct ktermios dummy; 1828ab4382d2SGreg Kroah-Hartman int i; 1829ab4382d2SGreg Kroah-Hartman 1830ab4382d2SGreg Kroah-Hartman /* 1831ab4382d2SGreg Kroah-Hartman * Ensure that the serial console lock is initialised 1832ab4382d2SGreg Kroah-Hartman * early. 183342b6a1baSRandy Witt * If this port is a console, then the spinlock is already 183442b6a1baSRandy Witt * initialised. 1835ab4382d2SGreg Kroah-Hartman */ 183642b6a1baSRandy Witt if (!(uart_console(port) && (port->cons->flags & CON_ENABLED))) { 1837ab4382d2SGreg Kroah-Hartman spin_lock_init(&port->lock); 1838ab4382d2SGreg Kroah-Hartman lockdep_set_class(&port->lock, &port_lock_key); 183942b6a1baSRandy Witt } 1840ab4382d2SGreg Kroah-Hartman 1841ab4382d2SGreg Kroah-Hartman memset(&termios, 0, sizeof(struct ktermios)); 1842ab4382d2SGreg Kroah-Hartman 1843ab4382d2SGreg Kroah-Hartman termios.c_cflag = CREAD | HUPCL | CLOCAL; 1844ab4382d2SGreg Kroah-Hartman 1845ab4382d2SGreg Kroah-Hartman /* 1846ab4382d2SGreg Kroah-Hartman * Construct a cflag setting. 1847ab4382d2SGreg Kroah-Hartman */ 1848ab4382d2SGreg Kroah-Hartman for (i = 0; baud_rates[i].rate; i++) 1849ab4382d2SGreg Kroah-Hartman if (baud_rates[i].rate <= baud) 1850ab4382d2SGreg Kroah-Hartman break; 1851ab4382d2SGreg Kroah-Hartman 1852ab4382d2SGreg Kroah-Hartman termios.c_cflag |= baud_rates[i].cflag; 1853ab4382d2SGreg Kroah-Hartman 1854ab4382d2SGreg Kroah-Hartman if (bits == 7) 1855ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CS7; 1856ab4382d2SGreg Kroah-Hartman else 1857ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CS8; 1858ab4382d2SGreg Kroah-Hartman 1859ab4382d2SGreg Kroah-Hartman switch (parity) { 1860ab4382d2SGreg Kroah-Hartman case 'o': case 'O': 1861ab4382d2SGreg Kroah-Hartman termios.c_cflag |= PARODD; 1862ab4382d2SGreg Kroah-Hartman /*fall through*/ 1863ab4382d2SGreg Kroah-Hartman case 'e': case 'E': 1864ab4382d2SGreg Kroah-Hartman termios.c_cflag |= PARENB; 1865ab4382d2SGreg Kroah-Hartman break; 1866ab4382d2SGreg Kroah-Hartman } 1867ab4382d2SGreg Kroah-Hartman 1868ab4382d2SGreg Kroah-Hartman if (flow == 'r') 1869ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CRTSCTS; 1870ab4382d2SGreg Kroah-Hartman 1871ab4382d2SGreg Kroah-Hartman /* 1872ab4382d2SGreg Kroah-Hartman * some uarts on other side don't support no flow control. 1873ab4382d2SGreg Kroah-Hartman * So we set * DTR in host uart to make them happy 1874ab4382d2SGreg Kroah-Hartman */ 1875ab4382d2SGreg Kroah-Hartman port->mctrl |= TIOCM_DTR; 1876ab4382d2SGreg Kroah-Hartman 1877ab4382d2SGreg Kroah-Hartman port->ops->set_termios(port, &termios, &dummy); 1878ab4382d2SGreg Kroah-Hartman /* 1879ab4382d2SGreg Kroah-Hartman * Allow the setting of the UART parameters with a NULL console 1880ab4382d2SGreg Kroah-Hartman * too: 1881ab4382d2SGreg Kroah-Hartman */ 1882ab4382d2SGreg Kroah-Hartman if (co) 1883ab4382d2SGreg Kroah-Hartman co->cflag = termios.c_cflag; 1884ab4382d2SGreg Kroah-Hartman 1885ab4382d2SGreg Kroah-Hartman return 0; 1886ab4382d2SGreg Kroah-Hartman } 1887ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_set_options); 1888ab4382d2SGreg Kroah-Hartman #endif /* CONFIG_SERIAL_CORE_CONSOLE */ 1889ab4382d2SGreg Kroah-Hartman 1890cf75525fSJiri Slaby /** 1891cf75525fSJiri Slaby * uart_change_pm - set power state of the port 1892cf75525fSJiri Slaby * 1893cf75525fSJiri Slaby * @state: port descriptor 1894cf75525fSJiri Slaby * @pm_state: new state 1895cf75525fSJiri Slaby * 1896cf75525fSJiri Slaby * Locking: port->mutex has to be held 1897cf75525fSJiri Slaby */ 18986f538fe3SLinus Walleij static void uart_change_pm(struct uart_state *state, 18996f538fe3SLinus Walleij enum uart_pm_state pm_state) 1900ab4382d2SGreg Kroah-Hartman { 1901ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 1902ab4382d2SGreg Kroah-Hartman 1903ab4382d2SGreg Kroah-Hartman if (state->pm_state != pm_state) { 1904ab4382d2SGreg Kroah-Hartman if (port->ops->pm) 1905ab4382d2SGreg Kroah-Hartman port->ops->pm(port, pm_state, state->pm_state); 1906ab4382d2SGreg Kroah-Hartman state->pm_state = pm_state; 1907ab4382d2SGreg Kroah-Hartman } 1908ab4382d2SGreg Kroah-Hartman } 1909ab4382d2SGreg Kroah-Hartman 1910ab4382d2SGreg Kroah-Hartman struct uart_match { 1911ab4382d2SGreg Kroah-Hartman struct uart_port *port; 1912ab4382d2SGreg Kroah-Hartman struct uart_driver *driver; 1913ab4382d2SGreg Kroah-Hartman }; 1914ab4382d2SGreg Kroah-Hartman 1915ab4382d2SGreg Kroah-Hartman static int serial_match_port(struct device *dev, void *data) 1916ab4382d2SGreg Kroah-Hartman { 1917ab4382d2SGreg Kroah-Hartman struct uart_match *match = data; 1918ab4382d2SGreg Kroah-Hartman struct tty_driver *tty_drv = match->driver->tty_driver; 1919ab4382d2SGreg Kroah-Hartman dev_t devt = MKDEV(tty_drv->major, tty_drv->minor_start) + 1920ab4382d2SGreg Kroah-Hartman match->port->line; 1921ab4382d2SGreg Kroah-Hartman 1922ab4382d2SGreg Kroah-Hartman return dev->devt == devt; /* Actually, only one tty per port */ 1923ab4382d2SGreg Kroah-Hartman } 1924ab4382d2SGreg Kroah-Hartman 1925ab4382d2SGreg Kroah-Hartman int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport) 1926ab4382d2SGreg Kroah-Hartman { 1927ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 1928ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1929ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 1930ab4382d2SGreg Kroah-Hartman struct uart_match match = {uport, drv}; 1931ab4382d2SGreg Kroah-Hartman 1932ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1933ab4382d2SGreg Kroah-Hartman 1934ab4382d2SGreg Kroah-Hartman tty_dev = device_find_child(uport->dev, &match, serial_match_port); 1935ab4382d2SGreg Kroah-Hartman if (device_may_wakeup(tty_dev)) { 1936ab4382d2SGreg Kroah-Hartman if (!enable_irq_wake(uport->irq)) 1937ab4382d2SGreg Kroah-Hartman uport->irq_wake = 1; 1938ab4382d2SGreg Kroah-Hartman put_device(tty_dev); 1939ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1940ab4382d2SGreg Kroah-Hartman return 0; 1941ab4382d2SGreg Kroah-Hartman } 19425a65dcc0SFederico Vaga put_device(tty_dev); 19435a65dcc0SFederico Vaga 1944ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) 1945ab4382d2SGreg Kroah-Hartman uport->suspended = 1; 1946ab4382d2SGreg Kroah-Hartman 1947ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_INITIALIZED) { 1948ab4382d2SGreg Kroah-Hartman const struct uart_ops *ops = uport->ops; 1949ab4382d2SGreg Kroah-Hartman int tries; 1950ab4382d2SGreg Kroah-Hartman 1951ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) { 1952ab4382d2SGreg Kroah-Hartman set_bit(ASYNCB_SUSPENDED, &port->flags); 1953ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_INITIALIZED, &port->flags); 1954ab4382d2SGreg Kroah-Hartman 1955ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1956ab4382d2SGreg Kroah-Hartman ops->stop_tx(uport); 1957ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, 0); 1958ab4382d2SGreg Kroah-Hartman ops->stop_rx(uport); 1959ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1960ab4382d2SGreg Kroah-Hartman } 1961ab4382d2SGreg Kroah-Hartman 1962ab4382d2SGreg Kroah-Hartman /* 1963ab4382d2SGreg Kroah-Hartman * Wait for the transmitter to empty. 1964ab4382d2SGreg Kroah-Hartman */ 1965ab4382d2SGreg Kroah-Hartman for (tries = 3; !ops->tx_empty(uport) && tries; tries--) 1966ab4382d2SGreg Kroah-Hartman msleep(10); 1967ab4382d2SGreg Kroah-Hartman if (!tries) 1968ab4382d2SGreg Kroah-Hartman printk(KERN_ERR "%s%s%s%d: Unable to drain " 1969ab4382d2SGreg Kroah-Hartman "transmitter\n", 1970ab4382d2SGreg Kroah-Hartman uport->dev ? dev_name(uport->dev) : "", 1971ab4382d2SGreg Kroah-Hartman uport->dev ? ": " : "", 1972ab4382d2SGreg Kroah-Hartman drv->dev_name, 1973ab4382d2SGreg Kroah-Hartman drv->tty_driver->name_base + uport->line); 1974ab4382d2SGreg Kroah-Hartman 1975ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) 1976ab4382d2SGreg Kroah-Hartman ops->shutdown(uport); 1977ab4382d2SGreg Kroah-Hartman } 1978ab4382d2SGreg Kroah-Hartman 1979ab4382d2SGreg Kroah-Hartman /* 1980ab4382d2SGreg Kroah-Hartman * Disable the console device before suspending. 1981ab4382d2SGreg Kroah-Hartman */ 1982ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled && uart_console(uport)) 1983ab4382d2SGreg Kroah-Hartman console_stop(uport->cons); 1984ab4382d2SGreg Kroah-Hartman 1985ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) 19866f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_OFF); 1987ab4382d2SGreg Kroah-Hartman 1988ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1989ab4382d2SGreg Kroah-Hartman 1990ab4382d2SGreg Kroah-Hartman return 0; 1991ab4382d2SGreg Kroah-Hartman } 1992ab4382d2SGreg Kroah-Hartman 1993ab4382d2SGreg Kroah-Hartman int uart_resume_port(struct uart_driver *drv, struct uart_port *uport) 1994ab4382d2SGreg Kroah-Hartman { 1995ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 1996ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1997ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 1998ab4382d2SGreg Kroah-Hartman struct uart_match match = {uport, drv}; 1999ab4382d2SGreg Kroah-Hartman struct ktermios termios; 2000ab4382d2SGreg Kroah-Hartman 2001ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2002ab4382d2SGreg Kroah-Hartman 2003ab4382d2SGreg Kroah-Hartman tty_dev = device_find_child(uport->dev, &match, serial_match_port); 2004ab4382d2SGreg Kroah-Hartman if (!uport->suspended && device_may_wakeup(tty_dev)) { 2005ab4382d2SGreg Kroah-Hartman if (uport->irq_wake) { 2006ab4382d2SGreg Kroah-Hartman disable_irq_wake(uport->irq); 2007ab4382d2SGreg Kroah-Hartman uport->irq_wake = 0; 2008ab4382d2SGreg Kroah-Hartman } 20095a65dcc0SFederico Vaga put_device(tty_dev); 2010ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2011ab4382d2SGreg Kroah-Hartman return 0; 2012ab4382d2SGreg Kroah-Hartman } 20135a65dcc0SFederico Vaga put_device(tty_dev); 2014ab4382d2SGreg Kroah-Hartman uport->suspended = 0; 2015ab4382d2SGreg Kroah-Hartman 2016ab4382d2SGreg Kroah-Hartman /* 2017ab4382d2SGreg Kroah-Hartman * Re-enable the console device after suspending. 2018ab4382d2SGreg Kroah-Hartman */ 20195933a161SYin Kangkai if (uart_console(uport)) { 2020ab4382d2SGreg Kroah-Hartman /* 2021ab4382d2SGreg Kroah-Hartman * First try to use the console cflag setting. 2022ab4382d2SGreg Kroah-Hartman */ 2023ab4382d2SGreg Kroah-Hartman memset(&termios, 0, sizeof(struct ktermios)); 2024ab4382d2SGreg Kroah-Hartman termios.c_cflag = uport->cons->cflag; 2025ab4382d2SGreg Kroah-Hartman 2026ab4382d2SGreg Kroah-Hartman /* 2027ab4382d2SGreg Kroah-Hartman * If that's unset, use the tty termios setting. 2028ab4382d2SGreg Kroah-Hartman */ 2029adc8d746SAlan Cox if (port->tty && termios.c_cflag == 0) 2030adc8d746SAlan Cox termios = port->tty->termios; 2031ab4382d2SGreg Kroah-Hartman 203294abc56fSNing Jiang if (console_suspend_enabled) 20336f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2034ab4382d2SGreg Kroah-Hartman uport->ops->set_termios(uport, &termios, NULL); 20355933a161SYin Kangkai if (console_suspend_enabled) 2036ab4382d2SGreg Kroah-Hartman console_start(uport->cons); 2037ab4382d2SGreg Kroah-Hartman } 2038ab4382d2SGreg Kroah-Hartman 2039ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_SUSPENDED) { 2040ab4382d2SGreg Kroah-Hartman const struct uart_ops *ops = uport->ops; 2041ab4382d2SGreg Kroah-Hartman int ret; 2042ab4382d2SGreg Kroah-Hartman 20436f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2044ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 2045ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, 0); 2046ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2047ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) { 2048ab4382d2SGreg Kroah-Hartman /* Protected by port mutex for now */ 2049ab4382d2SGreg Kroah-Hartman struct tty_struct *tty = port->tty; 2050ab4382d2SGreg Kroah-Hartman ret = ops->startup(uport); 2051ab4382d2SGreg Kroah-Hartman if (ret == 0) { 2052ab4382d2SGreg Kroah-Hartman if (tty) 2053ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 2054ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 2055ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, uport->mctrl); 2056ab4382d2SGreg Kroah-Hartman ops->start_tx(uport); 2057ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2058ab4382d2SGreg Kroah-Hartman set_bit(ASYNCB_INITIALIZED, &port->flags); 2059ab4382d2SGreg Kroah-Hartman } else { 2060ab4382d2SGreg Kroah-Hartman /* 2061ab4382d2SGreg Kroah-Hartman * Failed to resume - maybe hardware went away? 2062ab4382d2SGreg Kroah-Hartman * Clear the "initialized" flag so we won't try 2063ab4382d2SGreg Kroah-Hartman * to call the low level drivers shutdown method. 2064ab4382d2SGreg Kroah-Hartman */ 2065ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 2066ab4382d2SGreg Kroah-Hartman } 2067ab4382d2SGreg Kroah-Hartman } 2068ab4382d2SGreg Kroah-Hartman 2069ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_SUSPENDED, &port->flags); 2070ab4382d2SGreg Kroah-Hartman } 2071ab4382d2SGreg Kroah-Hartman 2072ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2073ab4382d2SGreg Kroah-Hartman 2074ab4382d2SGreg Kroah-Hartman return 0; 2075ab4382d2SGreg Kroah-Hartman } 2076ab4382d2SGreg Kroah-Hartman 2077ab4382d2SGreg Kroah-Hartman static inline void 2078ab4382d2SGreg Kroah-Hartman uart_report_port(struct uart_driver *drv, struct uart_port *port) 2079ab4382d2SGreg Kroah-Hartman { 2080ab4382d2SGreg Kroah-Hartman char address[64]; 2081ab4382d2SGreg Kroah-Hartman 2082ab4382d2SGreg Kroah-Hartman switch (port->iotype) { 2083ab4382d2SGreg Kroah-Hartman case UPIO_PORT: 2084ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), "I/O 0x%lx", port->iobase); 2085ab4382d2SGreg Kroah-Hartman break; 2086ab4382d2SGreg Kroah-Hartman case UPIO_HUB6: 2087ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), 2088ab4382d2SGreg Kroah-Hartman "I/O 0x%lx offset 0x%x", port->iobase, port->hub6); 2089ab4382d2SGreg Kroah-Hartman break; 2090ab4382d2SGreg Kroah-Hartman case UPIO_MEM: 2091ab4382d2SGreg Kroah-Hartman case UPIO_MEM32: 2092ab4382d2SGreg Kroah-Hartman case UPIO_AU: 2093ab4382d2SGreg Kroah-Hartman case UPIO_TSI: 2094ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), 2095ab4382d2SGreg Kroah-Hartman "MMIO 0x%llx", (unsigned long long)port->mapbase); 2096ab4382d2SGreg Kroah-Hartman break; 2097ab4382d2SGreg Kroah-Hartman default: 2098ab4382d2SGreg Kroah-Hartman strlcpy(address, "*unknown*", sizeof(address)); 2099ab4382d2SGreg Kroah-Hartman break; 2100ab4382d2SGreg Kroah-Hartman } 2101ab4382d2SGreg Kroah-Hartman 21027d12b976SKees Cook printk(KERN_INFO "%s%s%s%d at %s (irq = %d, base_baud = %d) is a %s\n", 2103ab4382d2SGreg Kroah-Hartman port->dev ? dev_name(port->dev) : "", 2104ab4382d2SGreg Kroah-Hartman port->dev ? ": " : "", 2105ab4382d2SGreg Kroah-Hartman drv->dev_name, 2106ab4382d2SGreg Kroah-Hartman drv->tty_driver->name_base + port->line, 21077d12b976SKees Cook address, port->irq, port->uartclk / 16, uart_type(port)); 2108ab4382d2SGreg Kroah-Hartman } 2109ab4382d2SGreg Kroah-Hartman 2110ab4382d2SGreg Kroah-Hartman static void 2111ab4382d2SGreg Kroah-Hartman uart_configure_port(struct uart_driver *drv, struct uart_state *state, 2112ab4382d2SGreg Kroah-Hartman struct uart_port *port) 2113ab4382d2SGreg Kroah-Hartman { 2114ab4382d2SGreg Kroah-Hartman unsigned int flags; 2115ab4382d2SGreg Kroah-Hartman 2116ab4382d2SGreg Kroah-Hartman /* 2117ab4382d2SGreg Kroah-Hartman * If there isn't a port here, don't do anything further. 2118ab4382d2SGreg Kroah-Hartman */ 2119ab4382d2SGreg Kroah-Hartman if (!port->iobase && !port->mapbase && !port->membase) 2120ab4382d2SGreg Kroah-Hartman return; 2121ab4382d2SGreg Kroah-Hartman 2122ab4382d2SGreg Kroah-Hartman /* 2123ab4382d2SGreg Kroah-Hartman * Now do the auto configuration stuff. Note that config_port 2124ab4382d2SGreg Kroah-Hartman * is expected to claim the resources and map the port for us. 2125ab4382d2SGreg Kroah-Hartman */ 2126ab4382d2SGreg Kroah-Hartman flags = 0; 2127ab4382d2SGreg Kroah-Hartman if (port->flags & UPF_AUTO_IRQ) 2128ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_IRQ; 2129ab4382d2SGreg Kroah-Hartman if (port->flags & UPF_BOOT_AUTOCONF) { 2130ab4382d2SGreg Kroah-Hartman if (!(port->flags & UPF_FIXED_TYPE)) { 2131ab4382d2SGreg Kroah-Hartman port->type = PORT_UNKNOWN; 2132ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_TYPE; 2133ab4382d2SGreg Kroah-Hartman } 2134ab4382d2SGreg Kroah-Hartman port->ops->config_port(port, flags); 2135ab4382d2SGreg Kroah-Hartman } 2136ab4382d2SGreg Kroah-Hartman 2137ab4382d2SGreg Kroah-Hartman if (port->type != PORT_UNKNOWN) { 2138ab4382d2SGreg Kroah-Hartman unsigned long flags; 2139ab4382d2SGreg Kroah-Hartman 2140ab4382d2SGreg Kroah-Hartman uart_report_port(drv, port); 2141ab4382d2SGreg Kroah-Hartman 2142ab4382d2SGreg Kroah-Hartman /* Power up port for set_mctrl() */ 21436f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2144ab4382d2SGreg Kroah-Hartman 2145ab4382d2SGreg Kroah-Hartman /* 2146ab4382d2SGreg Kroah-Hartman * Ensure that the modem control lines are de-activated. 2147ab4382d2SGreg Kroah-Hartman * keep the DTR setting that is set in uart_set_options() 2148ab4382d2SGreg Kroah-Hartman * We probably don't need a spinlock around this, but 2149ab4382d2SGreg Kroah-Hartman */ 2150ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 2151ab4382d2SGreg Kroah-Hartman port->ops->set_mctrl(port, port->mctrl & TIOCM_DTR); 2152ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 2153ab4382d2SGreg Kroah-Hartman 2154ab4382d2SGreg Kroah-Hartman /* 2155ab4382d2SGreg Kroah-Hartman * If this driver supports console, and it hasn't been 2156ab4382d2SGreg Kroah-Hartman * successfully registered yet, try to re-register it. 2157ab4382d2SGreg Kroah-Hartman * It may be that the port was not available. 2158ab4382d2SGreg Kroah-Hartman */ 2159ab4382d2SGreg Kroah-Hartman if (port->cons && !(port->cons->flags & CON_ENABLED)) 2160ab4382d2SGreg Kroah-Hartman register_console(port->cons); 2161ab4382d2SGreg Kroah-Hartman 2162ab4382d2SGreg Kroah-Hartman /* 2163ab4382d2SGreg Kroah-Hartman * Power down all ports by default, except the 2164ab4382d2SGreg Kroah-Hartman * console if we have one. 2165ab4382d2SGreg Kroah-Hartman */ 2166ab4382d2SGreg Kroah-Hartman if (!uart_console(port)) 21676f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_OFF); 2168ab4382d2SGreg Kroah-Hartman } 2169ab4382d2SGreg Kroah-Hartman } 2170ab4382d2SGreg Kroah-Hartman 2171ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 2172ab4382d2SGreg Kroah-Hartman 2173ab4382d2SGreg Kroah-Hartman static int uart_poll_init(struct tty_driver *driver, int line, char *options) 2174ab4382d2SGreg Kroah-Hartman { 2175ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2176ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2177ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2178ab4382d2SGreg Kroah-Hartman int baud = 9600; 2179ab4382d2SGreg Kroah-Hartman int bits = 8; 2180ab4382d2SGreg Kroah-Hartman int parity = 'n'; 2181ab4382d2SGreg Kroah-Hartman int flow = 'n'; 2182c7f3e708SAnton Vorontsov int ret; 2183ab4382d2SGreg Kroah-Hartman 2184ab4382d2SGreg Kroah-Hartman if (!state || !state->uart_port) 2185ab4382d2SGreg Kroah-Hartman return -1; 2186ab4382d2SGreg Kroah-Hartman 2187ab4382d2SGreg Kroah-Hartman port = state->uart_port; 2188ab4382d2SGreg Kroah-Hartman if (!(port->ops->poll_get_char && port->ops->poll_put_char)) 2189ab4382d2SGreg Kroah-Hartman return -1; 2190ab4382d2SGreg Kroah-Hartman 2191c7f3e708SAnton Vorontsov if (port->ops->poll_init) { 2192c7f3e708SAnton Vorontsov struct tty_port *tport = &state->port; 2193c7f3e708SAnton Vorontsov 2194c7f3e708SAnton Vorontsov ret = 0; 2195c7f3e708SAnton Vorontsov mutex_lock(&tport->mutex); 2196c7f3e708SAnton Vorontsov /* 2197c7f3e708SAnton Vorontsov * We don't set ASYNCB_INITIALIZED as we only initialized the 2198c7f3e708SAnton Vorontsov * hw, e.g. state->xmit is still uninitialized. 2199c7f3e708SAnton Vorontsov */ 2200c7f3e708SAnton Vorontsov if (!test_bit(ASYNCB_INITIALIZED, &tport->flags)) 2201c7f3e708SAnton Vorontsov ret = port->ops->poll_init(port); 2202c7f3e708SAnton Vorontsov mutex_unlock(&tport->mutex); 2203c7f3e708SAnton Vorontsov if (ret) 2204c7f3e708SAnton Vorontsov return ret; 2205c7f3e708SAnton Vorontsov } 2206c7f3e708SAnton Vorontsov 2207ab4382d2SGreg Kroah-Hartman if (options) { 2208ab4382d2SGreg Kroah-Hartman uart_parse_options(options, &baud, &parity, &bits, &flow); 2209ab4382d2SGreg Kroah-Hartman return uart_set_options(port, NULL, baud, parity, bits, flow); 2210ab4382d2SGreg Kroah-Hartman } 2211ab4382d2SGreg Kroah-Hartman 2212ab4382d2SGreg Kroah-Hartman return 0; 2213ab4382d2SGreg Kroah-Hartman } 2214ab4382d2SGreg Kroah-Hartman 2215ab4382d2SGreg Kroah-Hartman static int uart_poll_get_char(struct tty_driver *driver, int line) 2216ab4382d2SGreg Kroah-Hartman { 2217ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2218ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2219ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2220ab4382d2SGreg Kroah-Hartman 2221ab4382d2SGreg Kroah-Hartman if (!state || !state->uart_port) 2222ab4382d2SGreg Kroah-Hartman return -1; 2223ab4382d2SGreg Kroah-Hartman 2224ab4382d2SGreg Kroah-Hartman port = state->uart_port; 2225ab4382d2SGreg Kroah-Hartman return port->ops->poll_get_char(port); 2226ab4382d2SGreg Kroah-Hartman } 2227ab4382d2SGreg Kroah-Hartman 2228ab4382d2SGreg Kroah-Hartman static void uart_poll_put_char(struct tty_driver *driver, int line, char ch) 2229ab4382d2SGreg Kroah-Hartman { 2230ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2231ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2232ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2233ab4382d2SGreg Kroah-Hartman 2234ab4382d2SGreg Kroah-Hartman if (!state || !state->uart_port) 2235ab4382d2SGreg Kroah-Hartman return; 2236ab4382d2SGreg Kroah-Hartman 2237ab4382d2SGreg Kroah-Hartman port = state->uart_port; 2238ab4382d2SGreg Kroah-Hartman port->ops->poll_put_char(port, ch); 2239ab4382d2SGreg Kroah-Hartman } 2240ab4382d2SGreg Kroah-Hartman #endif 2241ab4382d2SGreg Kroah-Hartman 2242ab4382d2SGreg Kroah-Hartman static const struct tty_operations uart_ops = { 2243ab4382d2SGreg Kroah-Hartman .open = uart_open, 2244ab4382d2SGreg Kroah-Hartman .close = uart_close, 2245ab4382d2SGreg Kroah-Hartman .write = uart_write, 2246ab4382d2SGreg Kroah-Hartman .put_char = uart_put_char, 2247ab4382d2SGreg Kroah-Hartman .flush_chars = uart_flush_chars, 2248ab4382d2SGreg Kroah-Hartman .write_room = uart_write_room, 2249ab4382d2SGreg Kroah-Hartman .chars_in_buffer= uart_chars_in_buffer, 2250ab4382d2SGreg Kroah-Hartman .flush_buffer = uart_flush_buffer, 2251ab4382d2SGreg Kroah-Hartman .ioctl = uart_ioctl, 2252ab4382d2SGreg Kroah-Hartman .throttle = uart_throttle, 2253ab4382d2SGreg Kroah-Hartman .unthrottle = uart_unthrottle, 2254ab4382d2SGreg Kroah-Hartman .send_xchar = uart_send_xchar, 2255ab4382d2SGreg Kroah-Hartman .set_termios = uart_set_termios, 2256ab4382d2SGreg Kroah-Hartman .set_ldisc = uart_set_ldisc, 2257ab4382d2SGreg Kroah-Hartman .stop = uart_stop, 2258ab4382d2SGreg Kroah-Hartman .start = uart_start, 2259ab4382d2SGreg Kroah-Hartman .hangup = uart_hangup, 2260ab4382d2SGreg Kroah-Hartman .break_ctl = uart_break_ctl, 2261ab4382d2SGreg Kroah-Hartman .wait_until_sent= uart_wait_until_sent, 2262ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_PROC_FS 2263ab4382d2SGreg Kroah-Hartman .proc_fops = &uart_proc_fops, 2264ab4382d2SGreg Kroah-Hartman #endif 2265ab4382d2SGreg Kroah-Hartman .tiocmget = uart_tiocmget, 2266ab4382d2SGreg Kroah-Hartman .tiocmset = uart_tiocmset, 2267ab4382d2SGreg Kroah-Hartman .get_icount = uart_get_icount, 2268ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 2269ab4382d2SGreg Kroah-Hartman .poll_init = uart_poll_init, 2270ab4382d2SGreg Kroah-Hartman .poll_get_char = uart_poll_get_char, 2271ab4382d2SGreg Kroah-Hartman .poll_put_char = uart_poll_put_char, 2272ab4382d2SGreg Kroah-Hartman #endif 2273ab4382d2SGreg Kroah-Hartman }; 2274ab4382d2SGreg Kroah-Hartman 2275ab4382d2SGreg Kroah-Hartman static const struct tty_port_operations uart_port_ops = { 22760b1db830SJiri Slaby .activate = uart_port_activate, 22770b1db830SJiri Slaby .shutdown = uart_port_shutdown, 2278ab4382d2SGreg Kroah-Hartman .carrier_raised = uart_carrier_raised, 2279ab4382d2SGreg Kroah-Hartman .dtr_rts = uart_dtr_rts, 2280ab4382d2SGreg Kroah-Hartman }; 2281ab4382d2SGreg Kroah-Hartman 2282ab4382d2SGreg Kroah-Hartman /** 2283ab4382d2SGreg Kroah-Hartman * uart_register_driver - register a driver with the uart core layer 2284ab4382d2SGreg Kroah-Hartman * @drv: low level driver structure 2285ab4382d2SGreg Kroah-Hartman * 2286ab4382d2SGreg Kroah-Hartman * Register a uart driver with the core driver. We in turn register 2287ab4382d2SGreg Kroah-Hartman * with the tty layer, and initialise the core driver per-port state. 2288ab4382d2SGreg Kroah-Hartman * 2289ab4382d2SGreg Kroah-Hartman * We have a proc file in /proc/tty/driver which is named after the 2290ab4382d2SGreg Kroah-Hartman * normal driver. 2291ab4382d2SGreg Kroah-Hartman * 2292ab4382d2SGreg Kroah-Hartman * drv->port should be NULL, and the per-port structures should be 2293ab4382d2SGreg Kroah-Hartman * registered using uart_add_one_port after this call has succeeded. 2294ab4382d2SGreg Kroah-Hartman */ 2295ab4382d2SGreg Kroah-Hartman int uart_register_driver(struct uart_driver *drv) 2296ab4382d2SGreg Kroah-Hartman { 2297ab4382d2SGreg Kroah-Hartman struct tty_driver *normal; 2298ab4382d2SGreg Kroah-Hartman int i, retval; 2299ab4382d2SGreg Kroah-Hartman 2300ab4382d2SGreg Kroah-Hartman BUG_ON(drv->state); 2301ab4382d2SGreg Kroah-Hartman 2302ab4382d2SGreg Kroah-Hartman /* 2303ab4382d2SGreg Kroah-Hartman * Maybe we should be using a slab cache for this, especially if 2304ab4382d2SGreg Kroah-Hartman * we have a large number of ports to handle. 2305ab4382d2SGreg Kroah-Hartman */ 2306ab4382d2SGreg Kroah-Hartman drv->state = kzalloc(sizeof(struct uart_state) * drv->nr, GFP_KERNEL); 2307ab4382d2SGreg Kroah-Hartman if (!drv->state) 2308ab4382d2SGreg Kroah-Hartman goto out; 2309ab4382d2SGreg Kroah-Hartman 2310ab4382d2SGreg Kroah-Hartman normal = alloc_tty_driver(drv->nr); 2311ab4382d2SGreg Kroah-Hartman if (!normal) 2312ab4382d2SGreg Kroah-Hartman goto out_kfree; 2313ab4382d2SGreg Kroah-Hartman 2314ab4382d2SGreg Kroah-Hartman drv->tty_driver = normal; 2315ab4382d2SGreg Kroah-Hartman 2316ab4382d2SGreg Kroah-Hartman normal->driver_name = drv->driver_name; 2317ab4382d2SGreg Kroah-Hartman normal->name = drv->dev_name; 2318ab4382d2SGreg Kroah-Hartman normal->major = drv->major; 2319ab4382d2SGreg Kroah-Hartman normal->minor_start = drv->minor; 2320ab4382d2SGreg Kroah-Hartman normal->type = TTY_DRIVER_TYPE_SERIAL; 2321ab4382d2SGreg Kroah-Hartman normal->subtype = SERIAL_TYPE_NORMAL; 2322ab4382d2SGreg Kroah-Hartman normal->init_termios = tty_std_termios; 2323ab4382d2SGreg Kroah-Hartman normal->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; 2324ab4382d2SGreg Kroah-Hartman normal->init_termios.c_ispeed = normal->init_termios.c_ospeed = 9600; 2325ab4382d2SGreg Kroah-Hartman normal->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; 2326ab4382d2SGreg Kroah-Hartman normal->driver_state = drv; 2327ab4382d2SGreg Kroah-Hartman tty_set_operations(normal, &uart_ops); 2328ab4382d2SGreg Kroah-Hartman 2329ab4382d2SGreg Kroah-Hartman /* 2330ab4382d2SGreg Kroah-Hartman * Initialise the UART state(s). 2331ab4382d2SGreg Kroah-Hartman */ 2332ab4382d2SGreg Kroah-Hartman for (i = 0; i < drv->nr; i++) { 2333ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + i; 2334ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2335ab4382d2SGreg Kroah-Hartman 2336ab4382d2SGreg Kroah-Hartman tty_port_init(port); 2337ab4382d2SGreg Kroah-Hartman port->ops = &uart_port_ops; 23384cb0fbfdSJiri Slaby port->close_delay = HZ / 2; /* .5 seconds */ 23394cb0fbfdSJiri Slaby port->closing_wait = 30 * HZ;/* 30 seconds */ 2340ab4382d2SGreg Kroah-Hartman } 2341ab4382d2SGreg Kroah-Hartman 2342ab4382d2SGreg Kroah-Hartman retval = tty_register_driver(normal); 2343ab4382d2SGreg Kroah-Hartman if (retval >= 0) 2344ab4382d2SGreg Kroah-Hartman return retval; 2345ab4382d2SGreg Kroah-Hartman 2346191c5f10SJiri Slaby for (i = 0; i < drv->nr; i++) 2347191c5f10SJiri Slaby tty_port_destroy(&drv->state[i].port); 2348ab4382d2SGreg Kroah-Hartman put_tty_driver(normal); 2349ab4382d2SGreg Kroah-Hartman out_kfree: 2350ab4382d2SGreg Kroah-Hartman kfree(drv->state); 2351ab4382d2SGreg Kroah-Hartman out: 2352ab4382d2SGreg Kroah-Hartman return -ENOMEM; 2353ab4382d2SGreg Kroah-Hartman } 2354ab4382d2SGreg Kroah-Hartman 2355ab4382d2SGreg Kroah-Hartman /** 2356ab4382d2SGreg Kroah-Hartman * uart_unregister_driver - remove a driver from the uart core layer 2357ab4382d2SGreg Kroah-Hartman * @drv: low level driver structure 2358ab4382d2SGreg Kroah-Hartman * 2359ab4382d2SGreg Kroah-Hartman * Remove all references to a driver from the core driver. The low 2360ab4382d2SGreg Kroah-Hartman * level driver must have removed all its ports via the 2361ab4382d2SGreg Kroah-Hartman * uart_remove_one_port() if it registered them with uart_add_one_port(). 2362ab4382d2SGreg Kroah-Hartman * (ie, drv->port == NULL) 2363ab4382d2SGreg Kroah-Hartman */ 2364ab4382d2SGreg Kroah-Hartman void uart_unregister_driver(struct uart_driver *drv) 2365ab4382d2SGreg Kroah-Hartman { 2366ab4382d2SGreg Kroah-Hartman struct tty_driver *p = drv->tty_driver; 2367191c5f10SJiri Slaby unsigned int i; 2368191c5f10SJiri Slaby 2369ab4382d2SGreg Kroah-Hartman tty_unregister_driver(p); 2370ab4382d2SGreg Kroah-Hartman put_tty_driver(p); 2371191c5f10SJiri Slaby for (i = 0; i < drv->nr; i++) 2372191c5f10SJiri Slaby tty_port_destroy(&drv->state[i].port); 2373ab4382d2SGreg Kroah-Hartman kfree(drv->state); 23741e66cdedSAlan Cox drv->state = NULL; 2375ab4382d2SGreg Kroah-Hartman drv->tty_driver = NULL; 2376ab4382d2SGreg Kroah-Hartman } 2377ab4382d2SGreg Kroah-Hartman 2378ab4382d2SGreg Kroah-Hartman struct tty_driver *uart_console_device(struct console *co, int *index) 2379ab4382d2SGreg Kroah-Hartman { 2380ab4382d2SGreg Kroah-Hartman struct uart_driver *p = co->data; 2381ab4382d2SGreg Kroah-Hartman *index = co->index; 2382ab4382d2SGreg Kroah-Hartman return p->tty_driver; 2383ab4382d2SGreg Kroah-Hartman } 2384ab4382d2SGreg Kroah-Hartman 23856915c0e4STomas Hlavacek static ssize_t uart_get_attr_uartclk(struct device *dev, 23866915c0e4STomas Hlavacek struct device_attribute *attr, char *buf) 23876915c0e4STomas Hlavacek { 2388bebe73e3SAlan Cox struct serial_struct tmp; 23896915c0e4STomas Hlavacek struct tty_port *port = dev_get_drvdata(dev); 2390b1b79916STomas Hlavacek 23919f109694SAlan Cox uart_get_info(port, &tmp); 2392bebe73e3SAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.baud_base * 16); 23936915c0e4STomas Hlavacek } 23946915c0e4STomas Hlavacek 2395373bac4cSAlan Cox static ssize_t uart_get_attr_type(struct device *dev, 2396373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2397373bac4cSAlan Cox { 2398373bac4cSAlan Cox struct serial_struct tmp; 2399373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2400373bac4cSAlan Cox 2401373bac4cSAlan Cox uart_get_info(port, &tmp); 2402373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.type); 2403373bac4cSAlan Cox } 2404373bac4cSAlan Cox static ssize_t uart_get_attr_line(struct device *dev, 2405373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2406373bac4cSAlan Cox { 2407373bac4cSAlan Cox struct serial_struct tmp; 2408373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2409373bac4cSAlan Cox 2410373bac4cSAlan Cox uart_get_info(port, &tmp); 2411373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.line); 2412373bac4cSAlan Cox } 2413373bac4cSAlan Cox 2414373bac4cSAlan Cox static ssize_t uart_get_attr_port(struct device *dev, 2415373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2416373bac4cSAlan Cox { 2417373bac4cSAlan Cox struct serial_struct tmp; 2418373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2419fd985e1dSAndrew Morton unsigned long ioaddr; 2420373bac4cSAlan Cox 2421373bac4cSAlan Cox uart_get_info(port, &tmp); 2422fd985e1dSAndrew Morton ioaddr = tmp.port; 2423fd985e1dSAndrew Morton if (HIGH_BITS_OFFSET) 2424fd985e1dSAndrew Morton ioaddr |= (unsigned long)tmp.port_high << HIGH_BITS_OFFSET; 2425fd985e1dSAndrew Morton return snprintf(buf, PAGE_SIZE, "0x%lX\n", ioaddr); 2426373bac4cSAlan Cox } 2427373bac4cSAlan Cox 2428373bac4cSAlan Cox static ssize_t uart_get_attr_irq(struct device *dev, 2429373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2430373bac4cSAlan Cox { 2431373bac4cSAlan Cox struct serial_struct tmp; 2432373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2433373bac4cSAlan Cox 2434373bac4cSAlan Cox uart_get_info(port, &tmp); 2435373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.irq); 2436373bac4cSAlan Cox } 2437373bac4cSAlan Cox 2438373bac4cSAlan Cox static ssize_t uart_get_attr_flags(struct device *dev, 2439373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2440373bac4cSAlan Cox { 2441373bac4cSAlan Cox struct serial_struct tmp; 2442373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2443373bac4cSAlan Cox 2444373bac4cSAlan Cox uart_get_info(port, &tmp); 2445373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "0x%X\n", tmp.flags); 2446373bac4cSAlan Cox } 2447373bac4cSAlan Cox 2448373bac4cSAlan Cox static ssize_t uart_get_attr_xmit_fifo_size(struct device *dev, 2449373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2450373bac4cSAlan Cox { 2451373bac4cSAlan Cox struct serial_struct tmp; 2452373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2453373bac4cSAlan Cox 2454373bac4cSAlan Cox uart_get_info(port, &tmp); 2455373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.xmit_fifo_size); 2456373bac4cSAlan Cox } 2457373bac4cSAlan Cox 2458373bac4cSAlan Cox 2459373bac4cSAlan Cox static ssize_t uart_get_attr_close_delay(struct device *dev, 2460373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2461373bac4cSAlan Cox { 2462373bac4cSAlan Cox struct serial_struct tmp; 2463373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2464373bac4cSAlan Cox 2465373bac4cSAlan Cox uart_get_info(port, &tmp); 2466373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.close_delay); 2467373bac4cSAlan Cox } 2468373bac4cSAlan Cox 2469373bac4cSAlan Cox 2470373bac4cSAlan Cox static ssize_t uart_get_attr_closing_wait(struct device *dev, 2471373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2472373bac4cSAlan Cox { 2473373bac4cSAlan Cox struct serial_struct tmp; 2474373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2475373bac4cSAlan Cox 2476373bac4cSAlan Cox uart_get_info(port, &tmp); 2477373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.closing_wait); 2478373bac4cSAlan Cox } 2479373bac4cSAlan Cox 2480373bac4cSAlan Cox static ssize_t uart_get_attr_custom_divisor(struct device *dev, 2481373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2482373bac4cSAlan Cox { 2483373bac4cSAlan Cox struct serial_struct tmp; 2484373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2485373bac4cSAlan Cox 2486373bac4cSAlan Cox uart_get_info(port, &tmp); 2487373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.custom_divisor); 2488373bac4cSAlan Cox } 2489373bac4cSAlan Cox 2490373bac4cSAlan Cox static ssize_t uart_get_attr_io_type(struct device *dev, 2491373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2492373bac4cSAlan Cox { 2493373bac4cSAlan Cox struct serial_struct tmp; 2494373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2495373bac4cSAlan Cox 2496373bac4cSAlan Cox uart_get_info(port, &tmp); 2497373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.io_type); 2498373bac4cSAlan Cox } 2499373bac4cSAlan Cox 2500373bac4cSAlan Cox static ssize_t uart_get_attr_iomem_base(struct device *dev, 2501373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2502373bac4cSAlan Cox { 2503373bac4cSAlan Cox struct serial_struct tmp; 2504373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2505373bac4cSAlan Cox 2506373bac4cSAlan Cox uart_get_info(port, &tmp); 2507373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "0x%lX\n", (unsigned long)tmp.iomem_base); 2508373bac4cSAlan Cox } 2509373bac4cSAlan Cox 2510373bac4cSAlan Cox static ssize_t uart_get_attr_iomem_reg_shift(struct device *dev, 2511373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2512373bac4cSAlan Cox { 2513373bac4cSAlan Cox struct serial_struct tmp; 2514373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2515373bac4cSAlan Cox 2516373bac4cSAlan Cox uart_get_info(port, &tmp); 2517373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.iomem_reg_shift); 2518373bac4cSAlan Cox } 2519373bac4cSAlan Cox 2520373bac4cSAlan Cox static DEVICE_ATTR(type, S_IRUSR | S_IRGRP, uart_get_attr_type, NULL); 2521373bac4cSAlan Cox static DEVICE_ATTR(line, S_IRUSR | S_IRGRP, uart_get_attr_line, NULL); 2522373bac4cSAlan Cox static DEVICE_ATTR(port, S_IRUSR | S_IRGRP, uart_get_attr_port, NULL); 2523373bac4cSAlan Cox static DEVICE_ATTR(irq, S_IRUSR | S_IRGRP, uart_get_attr_irq, NULL); 2524373bac4cSAlan Cox static DEVICE_ATTR(flags, S_IRUSR | S_IRGRP, uart_get_attr_flags, NULL); 2525373bac4cSAlan Cox static DEVICE_ATTR(xmit_fifo_size, S_IRUSR | S_IRGRP, uart_get_attr_xmit_fifo_size, NULL); 25266915c0e4STomas Hlavacek static DEVICE_ATTR(uartclk, S_IRUSR | S_IRGRP, uart_get_attr_uartclk, NULL); 2527373bac4cSAlan Cox static DEVICE_ATTR(close_delay, S_IRUSR | S_IRGRP, uart_get_attr_close_delay, NULL); 2528373bac4cSAlan Cox static DEVICE_ATTR(closing_wait, S_IRUSR | S_IRGRP, uart_get_attr_closing_wait, NULL); 2529373bac4cSAlan Cox static DEVICE_ATTR(custom_divisor, S_IRUSR | S_IRGRP, uart_get_attr_custom_divisor, NULL); 2530373bac4cSAlan Cox static DEVICE_ATTR(io_type, S_IRUSR | S_IRGRP, uart_get_attr_io_type, NULL); 2531373bac4cSAlan Cox static DEVICE_ATTR(iomem_base, S_IRUSR | S_IRGRP, uart_get_attr_iomem_base, NULL); 2532373bac4cSAlan Cox static DEVICE_ATTR(iomem_reg_shift, S_IRUSR | S_IRGRP, uart_get_attr_iomem_reg_shift, NULL); 25336915c0e4STomas Hlavacek 25346915c0e4STomas Hlavacek static struct attribute *tty_dev_attrs[] = { 2535373bac4cSAlan Cox &dev_attr_type.attr, 2536373bac4cSAlan Cox &dev_attr_line.attr, 2537373bac4cSAlan Cox &dev_attr_port.attr, 2538373bac4cSAlan Cox &dev_attr_irq.attr, 2539373bac4cSAlan Cox &dev_attr_flags.attr, 2540373bac4cSAlan Cox &dev_attr_xmit_fifo_size.attr, 25416915c0e4STomas Hlavacek &dev_attr_uartclk.attr, 2542373bac4cSAlan Cox &dev_attr_close_delay.attr, 2543373bac4cSAlan Cox &dev_attr_closing_wait.attr, 2544373bac4cSAlan Cox &dev_attr_custom_divisor.attr, 2545373bac4cSAlan Cox &dev_attr_io_type.attr, 2546373bac4cSAlan Cox &dev_attr_iomem_base.attr, 2547373bac4cSAlan Cox &dev_attr_iomem_reg_shift.attr, 25486915c0e4STomas Hlavacek NULL, 25496915c0e4STomas Hlavacek }; 25506915c0e4STomas Hlavacek 2551b1b79916STomas Hlavacek static const struct attribute_group tty_dev_attr_group = { 25526915c0e4STomas Hlavacek .attrs = tty_dev_attrs, 25536915c0e4STomas Hlavacek }; 25546915c0e4STomas Hlavacek 25556915c0e4STomas Hlavacek static const struct attribute_group *tty_dev_attr_groups[] = { 25566915c0e4STomas Hlavacek &tty_dev_attr_group, 25576915c0e4STomas Hlavacek NULL 25586915c0e4STomas Hlavacek }; 25596915c0e4STomas Hlavacek 25609f109694SAlan Cox 2561ab4382d2SGreg Kroah-Hartman /** 2562ab4382d2SGreg Kroah-Hartman * uart_add_one_port - attach a driver-defined port structure 2563ab4382d2SGreg Kroah-Hartman * @drv: pointer to the uart low level driver structure for this port 2564ab4382d2SGreg Kroah-Hartman * @uport: uart port structure to use for this port. 2565ab4382d2SGreg Kroah-Hartman * 2566ab4382d2SGreg Kroah-Hartman * This allows the driver to register its own uart_port structure 2567ab4382d2SGreg Kroah-Hartman * with the core driver. The main purpose is to allow the low 2568ab4382d2SGreg Kroah-Hartman * level uart drivers to expand uart_port, rather than having yet 2569ab4382d2SGreg Kroah-Hartman * more levels of structures. 2570ab4382d2SGreg Kroah-Hartman */ 2571ab4382d2SGreg Kroah-Hartman int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport) 2572ab4382d2SGreg Kroah-Hartman { 2573ab4382d2SGreg Kroah-Hartman struct uart_state *state; 2574ab4382d2SGreg Kroah-Hartman struct tty_port *port; 2575ab4382d2SGreg Kroah-Hartman int ret = 0; 2576ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 2577ab4382d2SGreg Kroah-Hartman 2578ab4382d2SGreg Kroah-Hartman BUG_ON(in_interrupt()); 2579ab4382d2SGreg Kroah-Hartman 2580ab4382d2SGreg Kroah-Hartman if (uport->line >= drv->nr) 2581ab4382d2SGreg Kroah-Hartman return -EINVAL; 2582ab4382d2SGreg Kroah-Hartman 2583ab4382d2SGreg Kroah-Hartman state = drv->state + uport->line; 2584ab4382d2SGreg Kroah-Hartman port = &state->port; 2585ab4382d2SGreg Kroah-Hartman 2586ab4382d2SGreg Kroah-Hartman mutex_lock(&port_mutex); 2587ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2588ab4382d2SGreg Kroah-Hartman if (state->uart_port) { 2589ab4382d2SGreg Kroah-Hartman ret = -EINVAL; 2590ab4382d2SGreg Kroah-Hartman goto out; 2591ab4382d2SGreg Kroah-Hartman } 2592ab4382d2SGreg Kroah-Hartman 2593ab4382d2SGreg Kroah-Hartman state->uart_port = uport; 25946f538fe3SLinus Walleij state->pm_state = UART_PM_STATE_UNDEFINED; 2595ab4382d2SGreg Kroah-Hartman 2596ab4382d2SGreg Kroah-Hartman uport->cons = drv->cons; 2597ab4382d2SGreg Kroah-Hartman uport->state = state; 2598ab4382d2SGreg Kroah-Hartman 2599ab4382d2SGreg Kroah-Hartman /* 2600ab4382d2SGreg Kroah-Hartman * If this port is a console, then the spinlock is already 2601ab4382d2SGreg Kroah-Hartman * initialised. 2602ab4382d2SGreg Kroah-Hartman */ 2603ab4382d2SGreg Kroah-Hartman if (!(uart_console(uport) && (uport->cons->flags & CON_ENABLED))) { 2604ab4382d2SGreg Kroah-Hartman spin_lock_init(&uport->lock); 2605ab4382d2SGreg Kroah-Hartman lockdep_set_class(&uport->lock, &port_lock_key); 2606ab4382d2SGreg Kroah-Hartman } 2607ab4382d2SGreg Kroah-Hartman 2608ab4382d2SGreg Kroah-Hartman uart_configure_port(drv, state, uport); 2609ab4382d2SGreg Kroah-Hartman 2610ab4382d2SGreg Kroah-Hartman /* 2611ab4382d2SGreg Kroah-Hartman * Register the port whether it's detected or not. This allows 2612ab4382d2SGreg Kroah-Hartman * setserial to be used to alter this ports parameters. 2613ab4382d2SGreg Kroah-Hartman */ 2614b1b79916STomas Hlavacek tty_dev = tty_port_register_device_attr(port, drv->tty_driver, 2615b1b79916STomas Hlavacek uport->line, uport->dev, port, tty_dev_attr_groups); 2616ab4382d2SGreg Kroah-Hartman if (likely(!IS_ERR(tty_dev))) { 261777359835SSimon Glass device_set_wakeup_capable(tty_dev, 1); 261877359835SSimon Glass } else { 2619ab4382d2SGreg Kroah-Hartman printk(KERN_ERR "Cannot register tty device on line %d\n", 2620ab4382d2SGreg Kroah-Hartman uport->line); 262177359835SSimon Glass } 2622ab4382d2SGreg Kroah-Hartman 2623ab4382d2SGreg Kroah-Hartman /* 2624ab4382d2SGreg Kroah-Hartman * Ensure UPF_DEAD is not set. 2625ab4382d2SGreg Kroah-Hartman */ 2626ab4382d2SGreg Kroah-Hartman uport->flags &= ~UPF_DEAD; 2627ab4382d2SGreg Kroah-Hartman 2628ab4382d2SGreg Kroah-Hartman out: 2629ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2630ab4382d2SGreg Kroah-Hartman mutex_unlock(&port_mutex); 2631ab4382d2SGreg Kroah-Hartman 2632ab4382d2SGreg Kroah-Hartman return ret; 2633ab4382d2SGreg Kroah-Hartman } 2634ab4382d2SGreg Kroah-Hartman 2635ab4382d2SGreg Kroah-Hartman /** 2636ab4382d2SGreg Kroah-Hartman * uart_remove_one_port - detach a driver defined port structure 2637ab4382d2SGreg Kroah-Hartman * @drv: pointer to the uart low level driver structure for this port 2638ab4382d2SGreg Kroah-Hartman * @uport: uart port structure for this port 2639ab4382d2SGreg Kroah-Hartman * 2640ab4382d2SGreg Kroah-Hartman * This unhooks (and hangs up) the specified port structure from the 2641ab4382d2SGreg Kroah-Hartman * core driver. No further calls will be made to the low-level code 2642ab4382d2SGreg Kroah-Hartman * for this port. 2643ab4382d2SGreg Kroah-Hartman */ 2644ab4382d2SGreg Kroah-Hartman int uart_remove_one_port(struct uart_driver *drv, struct uart_port *uport) 2645ab4382d2SGreg Kroah-Hartman { 2646ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 2647ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2648b342dd51SChen Gang int ret = 0; 2649ab4382d2SGreg Kroah-Hartman 2650ab4382d2SGreg Kroah-Hartman BUG_ON(in_interrupt()); 2651ab4382d2SGreg Kroah-Hartman 2652ab4382d2SGreg Kroah-Hartman if (state->uart_port != uport) 2653ab4382d2SGreg Kroah-Hartman printk(KERN_ALERT "Removing wrong port: %p != %p\n", 2654ab4382d2SGreg Kroah-Hartman state->uart_port, uport); 2655ab4382d2SGreg Kroah-Hartman 2656ab4382d2SGreg Kroah-Hartman mutex_lock(&port_mutex); 2657ab4382d2SGreg Kroah-Hartman 2658ab4382d2SGreg Kroah-Hartman /* 2659ab4382d2SGreg Kroah-Hartman * Mark the port "dead" - this prevents any opens from 2660ab4382d2SGreg Kroah-Hartman * succeeding while we shut down the port. 2661ab4382d2SGreg Kroah-Hartman */ 2662ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2663b342dd51SChen Gang if (!state->uart_port) { 2664b342dd51SChen Gang mutex_unlock(&port->mutex); 2665b342dd51SChen Gang ret = -EINVAL; 2666b342dd51SChen Gang goto out; 2667b342dd51SChen Gang } 2668ab4382d2SGreg Kroah-Hartman uport->flags |= UPF_DEAD; 2669ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2670ab4382d2SGreg Kroah-Hartman 2671ab4382d2SGreg Kroah-Hartman /* 2672ab4382d2SGreg Kroah-Hartman * Remove the devices from the tty layer 2673ab4382d2SGreg Kroah-Hartman */ 2674ab4382d2SGreg Kroah-Hartman tty_unregister_device(drv->tty_driver, uport->line); 2675ab4382d2SGreg Kroah-Hartman 2676ab4382d2SGreg Kroah-Hartman if (port->tty) 2677ab4382d2SGreg Kroah-Hartman tty_vhangup(port->tty); 2678ab4382d2SGreg Kroah-Hartman 2679ab4382d2SGreg Kroah-Hartman /* 2680ab4382d2SGreg Kroah-Hartman * Free the port IO and memory resources, if any. 2681ab4382d2SGreg Kroah-Hartman */ 2682ab4382d2SGreg Kroah-Hartman if (uport->type != PORT_UNKNOWN) 2683ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 2684ab4382d2SGreg Kroah-Hartman 2685ab4382d2SGreg Kroah-Hartman /* 2686ab4382d2SGreg Kroah-Hartman * Indicate that there isn't a port here anymore. 2687ab4382d2SGreg Kroah-Hartman */ 2688ab4382d2SGreg Kroah-Hartman uport->type = PORT_UNKNOWN; 2689ab4382d2SGreg Kroah-Hartman 2690ab4382d2SGreg Kroah-Hartman state->uart_port = NULL; 2691b342dd51SChen Gang out: 2692ab4382d2SGreg Kroah-Hartman mutex_unlock(&port_mutex); 2693ab4382d2SGreg Kroah-Hartman 2694b342dd51SChen Gang return ret; 2695ab4382d2SGreg Kroah-Hartman } 2696ab4382d2SGreg Kroah-Hartman 2697ab4382d2SGreg Kroah-Hartman /* 2698ab4382d2SGreg Kroah-Hartman * Are the two ports equivalent? 2699ab4382d2SGreg Kroah-Hartman */ 2700ab4382d2SGreg Kroah-Hartman int uart_match_port(struct uart_port *port1, struct uart_port *port2) 2701ab4382d2SGreg Kroah-Hartman { 2702ab4382d2SGreg Kroah-Hartman if (port1->iotype != port2->iotype) 2703ab4382d2SGreg Kroah-Hartman return 0; 2704ab4382d2SGreg Kroah-Hartman 2705ab4382d2SGreg Kroah-Hartman switch (port1->iotype) { 2706ab4382d2SGreg Kroah-Hartman case UPIO_PORT: 2707ab4382d2SGreg Kroah-Hartman return (port1->iobase == port2->iobase); 2708ab4382d2SGreg Kroah-Hartman case UPIO_HUB6: 2709ab4382d2SGreg Kroah-Hartman return (port1->iobase == port2->iobase) && 2710ab4382d2SGreg Kroah-Hartman (port1->hub6 == port2->hub6); 2711ab4382d2SGreg Kroah-Hartman case UPIO_MEM: 2712ab4382d2SGreg Kroah-Hartman case UPIO_MEM32: 2713ab4382d2SGreg Kroah-Hartman case UPIO_AU: 2714ab4382d2SGreg Kroah-Hartman case UPIO_TSI: 2715ab4382d2SGreg Kroah-Hartman return (port1->mapbase == port2->mapbase); 2716ab4382d2SGreg Kroah-Hartman } 2717ab4382d2SGreg Kroah-Hartman return 0; 2718ab4382d2SGreg Kroah-Hartman } 2719ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_match_port); 2720ab4382d2SGreg Kroah-Hartman 2721027d7dacSJiri Slaby /** 2722027d7dacSJiri Slaby * uart_handle_dcd_change - handle a change of carrier detect state 2723027d7dacSJiri Slaby * @uport: uart_port structure for the open port 2724027d7dacSJiri Slaby * @status: new carrier detect status, nonzero if active 2725027d7dacSJiri Slaby */ 2726027d7dacSJiri Slaby void uart_handle_dcd_change(struct uart_port *uport, unsigned int status) 2727027d7dacSJiri Slaby { 272842381572SGeorge Spelvin struct tty_port *port = &uport->state->port; 272943eca0aeSAlan Cox struct tty_struct *tty = port->tty; 273042381572SGeorge Spelvin struct tty_ldisc *ld = tty ? tty_ldisc_ref(tty) : NULL; 2731027d7dacSJiri Slaby 273242381572SGeorge Spelvin if (ld) { 273342381572SGeorge Spelvin if (ld->ops->dcd_change) 2734593fb1aeSGeorge Spelvin ld->ops->dcd_change(tty, status); 273542381572SGeorge Spelvin tty_ldisc_deref(ld); 273642381572SGeorge Spelvin } 2737027d7dacSJiri Slaby 2738027d7dacSJiri Slaby uport->icount.dcd++; 2739027d7dacSJiri Slaby 2740027d7dacSJiri Slaby if (port->flags & ASYNC_CHECK_CD) { 2741027d7dacSJiri Slaby if (status) 2742027d7dacSJiri Slaby wake_up_interruptible(&port->open_wait); 274343eca0aeSAlan Cox else if (tty) 274443eca0aeSAlan Cox tty_hangup(tty); 2745027d7dacSJiri Slaby } 2746027d7dacSJiri Slaby } 2747027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_handle_dcd_change); 2748027d7dacSJiri Slaby 2749027d7dacSJiri Slaby /** 2750027d7dacSJiri Slaby * uart_handle_cts_change - handle a change of clear-to-send state 2751027d7dacSJiri Slaby * @uport: uart_port structure for the open port 2752027d7dacSJiri Slaby * @status: new clear to send status, nonzero if active 2753027d7dacSJiri Slaby */ 2754027d7dacSJiri Slaby void uart_handle_cts_change(struct uart_port *uport, unsigned int status) 2755027d7dacSJiri Slaby { 2756027d7dacSJiri Slaby struct tty_port *port = &uport->state->port; 2757027d7dacSJiri Slaby struct tty_struct *tty = port->tty; 2758027d7dacSJiri Slaby 2759027d7dacSJiri Slaby uport->icount.cts++; 2760027d7dacSJiri Slaby 2761f21ec3d2SHuang Shijie if (tty_port_cts_enabled(port)) { 2762027d7dacSJiri Slaby if (tty->hw_stopped) { 2763027d7dacSJiri Slaby if (status) { 2764027d7dacSJiri Slaby tty->hw_stopped = 0; 2765027d7dacSJiri Slaby uport->ops->start_tx(uport); 2766027d7dacSJiri Slaby uart_write_wakeup(uport); 2767027d7dacSJiri Slaby } 2768027d7dacSJiri Slaby } else { 2769027d7dacSJiri Slaby if (!status) { 2770027d7dacSJiri Slaby tty->hw_stopped = 1; 2771027d7dacSJiri Slaby uport->ops->stop_tx(uport); 2772027d7dacSJiri Slaby } 2773027d7dacSJiri Slaby } 2774027d7dacSJiri Slaby } 2775027d7dacSJiri Slaby } 2776027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_handle_cts_change); 2777027d7dacSJiri Slaby 2778cf75525fSJiri Slaby /** 2779cf75525fSJiri Slaby * uart_insert_char - push a char to the uart layer 2780cf75525fSJiri Slaby * 2781cf75525fSJiri Slaby * User is responsible to call tty_flip_buffer_push when they are done with 2782cf75525fSJiri Slaby * insertion. 2783cf75525fSJiri Slaby * 2784cf75525fSJiri Slaby * @port: corresponding port 2785cf75525fSJiri Slaby * @status: state of the serial port RX buffer (LSR for 8250) 2786cf75525fSJiri Slaby * @overrun: mask of overrun bits in @status 2787cf75525fSJiri Slaby * @ch: character to push 2788cf75525fSJiri Slaby * @flag: flag for the character (see TTY_NORMAL and friends) 2789cf75525fSJiri Slaby */ 2790027d7dacSJiri Slaby void uart_insert_char(struct uart_port *port, unsigned int status, 2791027d7dacSJiri Slaby unsigned int overrun, unsigned int ch, unsigned int flag) 2792027d7dacSJiri Slaby { 279392a19f9cSJiri Slaby struct tty_port *tport = &port->state->port; 2794027d7dacSJiri Slaby 2795027d7dacSJiri Slaby if ((status & port->ignore_status_mask & ~overrun) == 0) 279692a19f9cSJiri Slaby if (tty_insert_flip_char(tport, ch, flag) == 0) 2797dabfb351SCorbin ++port->icount.buf_overrun; 2798027d7dacSJiri Slaby 2799027d7dacSJiri Slaby /* 2800027d7dacSJiri Slaby * Overrun is special. Since it's reported immediately, 2801027d7dacSJiri Slaby * it doesn't affect the current character. 2802027d7dacSJiri Slaby */ 2803027d7dacSJiri Slaby if (status & ~port->ignore_status_mask & overrun) 280492a19f9cSJiri Slaby if (tty_insert_flip_char(tport, 0, TTY_OVERRUN) == 0) 2805dabfb351SCorbin ++port->icount.buf_overrun; 2806027d7dacSJiri Slaby } 2807027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_insert_char); 2808027d7dacSJiri Slaby 2809ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_write_wakeup); 2810ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_register_driver); 2811ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_unregister_driver); 2812ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_suspend_port); 2813ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_resume_port); 2814ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_add_one_port); 2815ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_remove_one_port); 2816ab4382d2SGreg Kroah-Hartman 2817ab4382d2SGreg Kroah-Hartman MODULE_DESCRIPTION("Serial driver core"); 2818ab4382d2SGreg Kroah-Hartman MODULE_LICENSE("GPL"); 2819