1ab4382d2SGreg Kroah-Hartman /* 2ab4382d2SGreg Kroah-Hartman * Driver core for serial ports 3ab4382d2SGreg Kroah-Hartman * 4ab4382d2SGreg Kroah-Hartman * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. 5ab4382d2SGreg Kroah-Hartman * 6ab4382d2SGreg Kroah-Hartman * Copyright 1999 ARM Limited 7ab4382d2SGreg Kroah-Hartman * Copyright (C) 2000-2001 Deep Blue Solutions Ltd. 8ab4382d2SGreg Kroah-Hartman * 9ab4382d2SGreg Kroah-Hartman * This program is free software; you can redistribute it and/or modify 10ab4382d2SGreg Kroah-Hartman * it under the terms of the GNU General Public License as published by 11ab4382d2SGreg Kroah-Hartman * the Free Software Foundation; either version 2 of the License, or 12ab4382d2SGreg Kroah-Hartman * (at your option) any later version. 13ab4382d2SGreg Kroah-Hartman * 14ab4382d2SGreg Kroah-Hartman * This program is distributed in the hope that it will be useful, 15ab4382d2SGreg Kroah-Hartman * but WITHOUT ANY WARRANTY; without even the implied warranty of 16ab4382d2SGreg Kroah-Hartman * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17ab4382d2SGreg Kroah-Hartman * GNU General Public License for more details. 18ab4382d2SGreg Kroah-Hartman * 19ab4382d2SGreg Kroah-Hartman * You should have received a copy of the GNU General Public License 20ab4382d2SGreg Kroah-Hartman * along with this program; if not, write to the Free Software 21ab4382d2SGreg Kroah-Hartman * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 22ab4382d2SGreg Kroah-Hartman */ 23ab4382d2SGreg Kroah-Hartman #include <linux/module.h> 24ab4382d2SGreg Kroah-Hartman #include <linux/tty.h> 25027d7dacSJiri Slaby #include <linux/tty_flip.h> 26ab4382d2SGreg Kroah-Hartman #include <linux/slab.h> 27ab4382d2SGreg Kroah-Hartman #include <linux/init.h> 28ab4382d2SGreg Kroah-Hartman #include <linux/console.h> 29ab4382d2SGreg Kroah-Hartman #include <linux/proc_fs.h> 30ab4382d2SGreg Kroah-Hartman #include <linux/seq_file.h> 31ab4382d2SGreg Kroah-Hartman #include <linux/device.h> 32ab4382d2SGreg Kroah-Hartman #include <linux/serial.h> /* for serial_state and serial_icounter_struct */ 33ab4382d2SGreg Kroah-Hartman #include <linux/serial_core.h> 34ab4382d2SGreg Kroah-Hartman #include <linux/delay.h> 35ab4382d2SGreg Kroah-Hartman #include <linux/mutex.h> 36ab4382d2SGreg Kroah-Hartman 37ab4382d2SGreg Kroah-Hartman #include <asm/irq.h> 38ab4382d2SGreg Kroah-Hartman #include <asm/uaccess.h> 39ab4382d2SGreg Kroah-Hartman 40ab4382d2SGreg Kroah-Hartman /* 41ab4382d2SGreg Kroah-Hartman * This is used to lock changes in serial line configuration. 42ab4382d2SGreg Kroah-Hartman */ 43ab4382d2SGreg Kroah-Hartman static DEFINE_MUTEX(port_mutex); 44ab4382d2SGreg Kroah-Hartman 45ab4382d2SGreg Kroah-Hartman /* 46ab4382d2SGreg Kroah-Hartman * lockdep: port->lock is initialized in two places, but we 47ab4382d2SGreg Kroah-Hartman * want only one lock-class: 48ab4382d2SGreg Kroah-Hartman */ 49ab4382d2SGreg Kroah-Hartman static struct lock_class_key port_lock_key; 50ab4382d2SGreg Kroah-Hartman 51ab4382d2SGreg Kroah-Hartman #define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8) 52ab4382d2SGreg Kroah-Hartman 53ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_SERIAL_CORE_CONSOLE 54ab4382d2SGreg Kroah-Hartman #define uart_console(port) ((port)->cons && (port)->cons->index == (port)->line) 55ab4382d2SGreg Kroah-Hartman #else 56ab4382d2SGreg Kroah-Hartman #define uart_console(port) (0) 57ab4382d2SGreg Kroah-Hartman #endif 58ab4382d2SGreg Kroah-Hartman 59ab4382d2SGreg Kroah-Hartman static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, 60ab4382d2SGreg Kroah-Hartman struct ktermios *old_termios); 611f33a51dSJiri Slaby static void uart_wait_until_sent(struct tty_struct *tty, int timeout); 62ab4382d2SGreg Kroah-Hartman static void uart_change_pm(struct uart_state *state, int pm_state); 63ab4382d2SGreg Kroah-Hartman 64ab4382d2SGreg Kroah-Hartman /* 65ab4382d2SGreg Kroah-Hartman * This routine is used by the interrupt handler to schedule processing in 66ab4382d2SGreg Kroah-Hartman * the software interrupt portion of the driver. 67ab4382d2SGreg Kroah-Hartman */ 68ab4382d2SGreg Kroah-Hartman void uart_write_wakeup(struct uart_port *port) 69ab4382d2SGreg Kroah-Hartman { 70ab4382d2SGreg Kroah-Hartman struct uart_state *state = port->state; 71ab4382d2SGreg Kroah-Hartman /* 72ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 73ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 74ab4382d2SGreg Kroah-Hartman */ 75ab4382d2SGreg Kroah-Hartman BUG_ON(!state); 766a3e492bSJiri Slaby tty_wakeup(state->port.tty); 77ab4382d2SGreg Kroah-Hartman } 78ab4382d2SGreg Kroah-Hartman 79ab4382d2SGreg Kroah-Hartman static void uart_stop(struct tty_struct *tty) 80ab4382d2SGreg Kroah-Hartman { 81ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 82ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 83ab4382d2SGreg Kroah-Hartman unsigned long flags; 84ab4382d2SGreg Kroah-Hartman 85ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 86ab4382d2SGreg Kroah-Hartman port->ops->stop_tx(port); 87ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 88ab4382d2SGreg Kroah-Hartman } 89ab4382d2SGreg Kroah-Hartman 90ab4382d2SGreg Kroah-Hartman static void __uart_start(struct tty_struct *tty) 91ab4382d2SGreg Kroah-Hartman { 92ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 93ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 94ab4382d2SGreg Kroah-Hartman 95ab4382d2SGreg Kroah-Hartman if (!uart_circ_empty(&state->xmit) && state->xmit.buf && 96ab4382d2SGreg Kroah-Hartman !tty->stopped && !tty->hw_stopped) 97ab4382d2SGreg Kroah-Hartman port->ops->start_tx(port); 98ab4382d2SGreg Kroah-Hartman } 99ab4382d2SGreg Kroah-Hartman 100ab4382d2SGreg Kroah-Hartman static void uart_start(struct tty_struct *tty) 101ab4382d2SGreg Kroah-Hartman { 102ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 103ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 104ab4382d2SGreg Kroah-Hartman unsigned long flags; 105ab4382d2SGreg Kroah-Hartman 106ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 107ab4382d2SGreg Kroah-Hartman __uart_start(tty); 108ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 109ab4382d2SGreg Kroah-Hartman } 110ab4382d2SGreg Kroah-Hartman 111ab4382d2SGreg Kroah-Hartman static inline void 112ab4382d2SGreg Kroah-Hartman uart_update_mctrl(struct uart_port *port, unsigned int set, unsigned int clear) 113ab4382d2SGreg Kroah-Hartman { 114ab4382d2SGreg Kroah-Hartman unsigned long flags; 115ab4382d2SGreg Kroah-Hartman unsigned int old; 116ab4382d2SGreg Kroah-Hartman 117ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 118ab4382d2SGreg Kroah-Hartman old = port->mctrl; 119ab4382d2SGreg Kroah-Hartman port->mctrl = (old & ~clear) | set; 120ab4382d2SGreg Kroah-Hartman if (old != port->mctrl) 121ab4382d2SGreg Kroah-Hartman port->ops->set_mctrl(port, port->mctrl); 122ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 123ab4382d2SGreg Kroah-Hartman } 124ab4382d2SGreg Kroah-Hartman 125ab4382d2SGreg Kroah-Hartman #define uart_set_mctrl(port, set) uart_update_mctrl(port, set, 0) 126ab4382d2SGreg Kroah-Hartman #define uart_clear_mctrl(port, clear) uart_update_mctrl(port, 0, clear) 127ab4382d2SGreg Kroah-Hartman 128ab4382d2SGreg Kroah-Hartman /* 129ab4382d2SGreg Kroah-Hartman * Startup the port. This will be called once per open. All calls 130ab4382d2SGreg Kroah-Hartman * will be serialised by the per-port mutex. 131ab4382d2SGreg Kroah-Hartman */ 132ab4382d2SGreg Kroah-Hartman static int uart_startup(struct tty_struct *tty, struct uart_state *state, int init_hw) 133ab4382d2SGreg Kroah-Hartman { 134ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 135ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 136ab4382d2SGreg Kroah-Hartman unsigned long page; 137ab4382d2SGreg Kroah-Hartman int retval = 0; 138ab4382d2SGreg Kroah-Hartman 139ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_INITIALIZED) 140ab4382d2SGreg Kroah-Hartman return 0; 141ab4382d2SGreg Kroah-Hartman 142ab4382d2SGreg Kroah-Hartman /* 143ab4382d2SGreg Kroah-Hartman * Set the TTY IO error marker - we will only clear this 144b39c49a0SJiri Slaby * once we have successfully opened the port. 145ab4382d2SGreg Kroah-Hartman */ 146ab4382d2SGreg Kroah-Hartman set_bit(TTY_IO_ERROR, &tty->flags); 147ab4382d2SGreg Kroah-Hartman 148ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) 149ab4382d2SGreg Kroah-Hartman return 0; 150ab4382d2SGreg Kroah-Hartman 151ab4382d2SGreg Kroah-Hartman /* 152ab4382d2SGreg Kroah-Hartman * Initialise and allocate the transmit and temporary 153ab4382d2SGreg Kroah-Hartman * buffer. 154ab4382d2SGreg Kroah-Hartman */ 155ab4382d2SGreg Kroah-Hartman if (!state->xmit.buf) { 156ab4382d2SGreg Kroah-Hartman /* This is protected by the per port mutex */ 157ab4382d2SGreg Kroah-Hartman page = get_zeroed_page(GFP_KERNEL); 158ab4382d2SGreg Kroah-Hartman if (!page) 159ab4382d2SGreg Kroah-Hartman return -ENOMEM; 160ab4382d2SGreg Kroah-Hartman 161ab4382d2SGreg Kroah-Hartman state->xmit.buf = (unsigned char *) page; 162ab4382d2SGreg Kroah-Hartman uart_circ_clear(&state->xmit); 163ab4382d2SGreg Kroah-Hartman } 164ab4382d2SGreg Kroah-Hartman 165ab4382d2SGreg Kroah-Hartman retval = uport->ops->startup(uport); 166ab4382d2SGreg Kroah-Hartman if (retval == 0) { 167c7d7abffSJiri Slaby if (uart_console(uport) && uport->cons->cflag) { 168c7d7abffSJiri Slaby tty->termios->c_cflag = uport->cons->cflag; 169c7d7abffSJiri Slaby uport->cons->cflag = 0; 170c7d7abffSJiri Slaby } 171ab4382d2SGreg Kroah-Hartman /* 172ab4382d2SGreg Kroah-Hartman * Initialise the hardware port settings. 173ab4382d2SGreg Kroah-Hartman */ 174ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 175ab4382d2SGreg Kroah-Hartman 176c7d7abffSJiri Slaby if (init_hw) { 177ab4382d2SGreg Kroah-Hartman /* 178ab4382d2SGreg Kroah-Hartman * Setup the RTS and DTR signals once the 179ab4382d2SGreg Kroah-Hartman * port is open and ready to respond. 180ab4382d2SGreg Kroah-Hartman */ 181ab4382d2SGreg Kroah-Hartman if (tty->termios->c_cflag & CBAUD) 182ab4382d2SGreg Kroah-Hartman uart_set_mctrl(uport, TIOCM_RTS | TIOCM_DTR); 183ab4382d2SGreg Kroah-Hartman } 184ab4382d2SGreg Kroah-Hartman 185ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_CTS_FLOW) { 186ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 187ab4382d2SGreg Kroah-Hartman if (!(uport->ops->get_mctrl(uport) & TIOCM_CTS)) 188ab4382d2SGreg Kroah-Hartman tty->hw_stopped = 1; 189ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 190ab4382d2SGreg Kroah-Hartman } 191ab4382d2SGreg Kroah-Hartman 192ab4382d2SGreg Kroah-Hartman set_bit(ASYNCB_INITIALIZED, &port->flags); 193ab4382d2SGreg Kroah-Hartman 194ab4382d2SGreg Kroah-Hartman clear_bit(TTY_IO_ERROR, &tty->flags); 195ab4382d2SGreg Kroah-Hartman } 196ab4382d2SGreg Kroah-Hartman 1970055197eSJiri Slaby /* 1980055197eSJiri Slaby * This is to allow setserial on this port. People may want to set 1990055197eSJiri Slaby * port/irq/type and then reconfigure the port properly if it failed 2000055197eSJiri Slaby * now. 2010055197eSJiri Slaby */ 202ab4382d2SGreg Kroah-Hartman if (retval && capable(CAP_SYS_ADMIN)) 203ab4382d2SGreg Kroah-Hartman retval = 0; 204ab4382d2SGreg Kroah-Hartman 205ab4382d2SGreg Kroah-Hartman return retval; 206ab4382d2SGreg Kroah-Hartman } 207ab4382d2SGreg Kroah-Hartman 208ab4382d2SGreg Kroah-Hartman /* 209ab4382d2SGreg Kroah-Hartman * This routine will shutdown a serial port; interrupts are disabled, and 210ab4382d2SGreg Kroah-Hartman * DTR is dropped if the hangup on close termio flag is on. Calls to 211ab4382d2SGreg Kroah-Hartman * uart_shutdown are serialised by the per-port semaphore. 212ab4382d2SGreg Kroah-Hartman */ 213ab4382d2SGreg Kroah-Hartman static void uart_shutdown(struct tty_struct *tty, struct uart_state *state) 214ab4382d2SGreg Kroah-Hartman { 215ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 216ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 217ab4382d2SGreg Kroah-Hartman 218ab4382d2SGreg Kroah-Hartman /* 219ab4382d2SGreg Kroah-Hartman * Set the TTY IO error marker 220ab4382d2SGreg Kroah-Hartman */ 221ab4382d2SGreg Kroah-Hartman if (tty) 222ab4382d2SGreg Kroah-Hartman set_bit(TTY_IO_ERROR, &tty->flags); 223ab4382d2SGreg Kroah-Hartman 224ab4382d2SGreg Kroah-Hartman if (test_and_clear_bit(ASYNCB_INITIALIZED, &port->flags)) { 225ab4382d2SGreg Kroah-Hartman /* 226ab4382d2SGreg Kroah-Hartman * Turn off DTR and RTS early. 227ab4382d2SGreg Kroah-Hartman */ 228ab4382d2SGreg Kroah-Hartman if (!tty || (tty->termios->c_cflag & HUPCL)) 229ab4382d2SGreg Kroah-Hartman uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); 230ab4382d2SGreg Kroah-Hartman 231ab4382d2SGreg Kroah-Hartman /* 232ab4382d2SGreg Kroah-Hartman * clear delta_msr_wait queue to avoid mem leaks: we may free 233ab4382d2SGreg Kroah-Hartman * the irq here so the queue might never be woken up. Note 234ab4382d2SGreg Kroah-Hartman * that we won't end up waiting on delta_msr_wait again since 235ab4382d2SGreg Kroah-Hartman * any outstanding file descriptors should be pointing at 236ab4382d2SGreg Kroah-Hartman * hung_up_tty_fops now. 237ab4382d2SGreg Kroah-Hartman */ 238ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->delta_msr_wait); 239ab4382d2SGreg Kroah-Hartman 240ab4382d2SGreg Kroah-Hartman /* 241ab4382d2SGreg Kroah-Hartman * Free the IRQ and disable the port. 242ab4382d2SGreg Kroah-Hartman */ 243ab4382d2SGreg Kroah-Hartman uport->ops->shutdown(uport); 244ab4382d2SGreg Kroah-Hartman 245ab4382d2SGreg Kroah-Hartman /* 246ab4382d2SGreg Kroah-Hartman * Ensure that the IRQ handler isn't running on another CPU. 247ab4382d2SGreg Kroah-Hartman */ 248ab4382d2SGreg Kroah-Hartman synchronize_irq(uport->irq); 249ab4382d2SGreg Kroah-Hartman } 250ab4382d2SGreg Kroah-Hartman 251ab4382d2SGreg Kroah-Hartman /* 252d208a3bfSDoug Anderson * It's possible for shutdown to be called after suspend if we get 253d208a3bfSDoug Anderson * a DCD drop (hangup) at just the right time. Clear suspended bit so 254d208a3bfSDoug Anderson * we don't try to resume a port that has been shutdown. 255ab4382d2SGreg Kroah-Hartman */ 256d208a3bfSDoug Anderson clear_bit(ASYNCB_SUSPENDED, &port->flags); 257ab4382d2SGreg Kroah-Hartman 258ab4382d2SGreg Kroah-Hartman /* 259ab4382d2SGreg Kroah-Hartman * Free the transmit buffer page. 260ab4382d2SGreg Kroah-Hartman */ 261ab4382d2SGreg Kroah-Hartman if (state->xmit.buf) { 262ab4382d2SGreg Kroah-Hartman free_page((unsigned long)state->xmit.buf); 263ab4382d2SGreg Kroah-Hartman state->xmit.buf = NULL; 264ab4382d2SGreg Kroah-Hartman } 265ab4382d2SGreg Kroah-Hartman } 266ab4382d2SGreg Kroah-Hartman 267ab4382d2SGreg Kroah-Hartman /** 268ab4382d2SGreg Kroah-Hartman * uart_update_timeout - update per-port FIFO timeout. 269ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port 270ab4382d2SGreg Kroah-Hartman * @cflag: termios cflag value 271ab4382d2SGreg Kroah-Hartman * @baud: speed of the port 272ab4382d2SGreg Kroah-Hartman * 273ab4382d2SGreg Kroah-Hartman * Set the port FIFO timeout value. The @cflag value should 274ab4382d2SGreg Kroah-Hartman * reflect the actual hardware settings. 275ab4382d2SGreg Kroah-Hartman */ 276ab4382d2SGreg Kroah-Hartman void 277ab4382d2SGreg Kroah-Hartman uart_update_timeout(struct uart_port *port, unsigned int cflag, 278ab4382d2SGreg Kroah-Hartman unsigned int baud) 279ab4382d2SGreg Kroah-Hartman { 280ab4382d2SGreg Kroah-Hartman unsigned int bits; 281ab4382d2SGreg Kroah-Hartman 282ab4382d2SGreg Kroah-Hartman /* byte size and parity */ 283ab4382d2SGreg Kroah-Hartman switch (cflag & CSIZE) { 284ab4382d2SGreg Kroah-Hartman case CS5: 285ab4382d2SGreg Kroah-Hartman bits = 7; 286ab4382d2SGreg Kroah-Hartman break; 287ab4382d2SGreg Kroah-Hartman case CS6: 288ab4382d2SGreg Kroah-Hartman bits = 8; 289ab4382d2SGreg Kroah-Hartman break; 290ab4382d2SGreg Kroah-Hartman case CS7: 291ab4382d2SGreg Kroah-Hartman bits = 9; 292ab4382d2SGreg Kroah-Hartman break; 293ab4382d2SGreg Kroah-Hartman default: 294ab4382d2SGreg Kroah-Hartman bits = 10; 295ab4382d2SGreg Kroah-Hartman break; /* CS8 */ 296ab4382d2SGreg Kroah-Hartman } 297ab4382d2SGreg Kroah-Hartman 298ab4382d2SGreg Kroah-Hartman if (cflag & CSTOPB) 299ab4382d2SGreg Kroah-Hartman bits++; 300ab4382d2SGreg Kroah-Hartman if (cflag & PARENB) 301ab4382d2SGreg Kroah-Hartman bits++; 302ab4382d2SGreg Kroah-Hartman 303ab4382d2SGreg Kroah-Hartman /* 304ab4382d2SGreg Kroah-Hartman * The total number of bits to be transmitted in the fifo. 305ab4382d2SGreg Kroah-Hartman */ 306ab4382d2SGreg Kroah-Hartman bits = bits * port->fifosize; 307ab4382d2SGreg Kroah-Hartman 308ab4382d2SGreg Kroah-Hartman /* 309ab4382d2SGreg Kroah-Hartman * Figure the timeout to send the above number of bits. 310ab4382d2SGreg Kroah-Hartman * Add .02 seconds of slop 311ab4382d2SGreg Kroah-Hartman */ 312ab4382d2SGreg Kroah-Hartman port->timeout = (HZ * bits) / baud + HZ/50; 313ab4382d2SGreg Kroah-Hartman } 314ab4382d2SGreg Kroah-Hartman 315ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_update_timeout); 316ab4382d2SGreg Kroah-Hartman 317ab4382d2SGreg Kroah-Hartman /** 318ab4382d2SGreg Kroah-Hartman * uart_get_baud_rate - return baud rate for a particular port 319ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port in question. 320ab4382d2SGreg Kroah-Hartman * @termios: desired termios settings. 321ab4382d2SGreg Kroah-Hartman * @old: old termios (or NULL) 322ab4382d2SGreg Kroah-Hartman * @min: minimum acceptable baud rate 323ab4382d2SGreg Kroah-Hartman * @max: maximum acceptable baud rate 324ab4382d2SGreg Kroah-Hartman * 325ab4382d2SGreg Kroah-Hartman * Decode the termios structure into a numeric baud rate, 326ab4382d2SGreg Kroah-Hartman * taking account of the magic 38400 baud rate (with spd_* 327ab4382d2SGreg Kroah-Hartman * flags), and mapping the %B0 rate to 9600 baud. 328ab4382d2SGreg Kroah-Hartman * 329ab4382d2SGreg Kroah-Hartman * If the new baud rate is invalid, try the old termios setting. 330ab4382d2SGreg Kroah-Hartman * If it's still invalid, we try 9600 baud. 331ab4382d2SGreg Kroah-Hartman * 332ab4382d2SGreg Kroah-Hartman * Update the @termios structure to reflect the baud rate 333ab4382d2SGreg Kroah-Hartman * we're actually going to be using. Don't do this for the case 334ab4382d2SGreg Kroah-Hartman * where B0 is requested ("hang up"). 335ab4382d2SGreg Kroah-Hartman */ 336ab4382d2SGreg Kroah-Hartman unsigned int 337ab4382d2SGreg Kroah-Hartman uart_get_baud_rate(struct uart_port *port, struct ktermios *termios, 338ab4382d2SGreg Kroah-Hartman struct ktermios *old, unsigned int min, unsigned int max) 339ab4382d2SGreg Kroah-Hartman { 340ab4382d2SGreg Kroah-Hartman unsigned int try, baud, altbaud = 38400; 341ab4382d2SGreg Kroah-Hartman int hung_up = 0; 342ab4382d2SGreg Kroah-Hartman upf_t flags = port->flags & UPF_SPD_MASK; 343ab4382d2SGreg Kroah-Hartman 344ab4382d2SGreg Kroah-Hartman if (flags == UPF_SPD_HI) 345ab4382d2SGreg Kroah-Hartman altbaud = 57600; 346ab4382d2SGreg Kroah-Hartman else if (flags == UPF_SPD_VHI) 347ab4382d2SGreg Kroah-Hartman altbaud = 115200; 348ab4382d2SGreg Kroah-Hartman else if (flags == UPF_SPD_SHI) 349ab4382d2SGreg Kroah-Hartman altbaud = 230400; 350ab4382d2SGreg Kroah-Hartman else if (flags == UPF_SPD_WARP) 351ab4382d2SGreg Kroah-Hartman altbaud = 460800; 352ab4382d2SGreg Kroah-Hartman 353ab4382d2SGreg Kroah-Hartman for (try = 0; try < 2; try++) { 354ab4382d2SGreg Kroah-Hartman baud = tty_termios_baud_rate(termios); 355ab4382d2SGreg Kroah-Hartman 356ab4382d2SGreg Kroah-Hartman /* 357ab4382d2SGreg Kroah-Hartman * The spd_hi, spd_vhi, spd_shi, spd_warp kludge... 358ab4382d2SGreg Kroah-Hartman * Die! Die! Die! 359ab4382d2SGreg Kroah-Hartman */ 360ab4382d2SGreg Kroah-Hartman if (baud == 38400) 361ab4382d2SGreg Kroah-Hartman baud = altbaud; 362ab4382d2SGreg Kroah-Hartman 363ab4382d2SGreg Kroah-Hartman /* 364ab4382d2SGreg Kroah-Hartman * Special case: B0 rate. 365ab4382d2SGreg Kroah-Hartman */ 366ab4382d2SGreg Kroah-Hartman if (baud == 0) { 367ab4382d2SGreg Kroah-Hartman hung_up = 1; 368ab4382d2SGreg Kroah-Hartman baud = 9600; 369ab4382d2SGreg Kroah-Hartman } 370ab4382d2SGreg Kroah-Hartman 371ab4382d2SGreg Kroah-Hartman if (baud >= min && baud <= max) 372ab4382d2SGreg Kroah-Hartman return baud; 373ab4382d2SGreg Kroah-Hartman 374ab4382d2SGreg Kroah-Hartman /* 375ab4382d2SGreg Kroah-Hartman * Oops, the quotient was zero. Try again with 376ab4382d2SGreg Kroah-Hartman * the old baud rate if possible. 377ab4382d2SGreg Kroah-Hartman */ 378ab4382d2SGreg Kroah-Hartman termios->c_cflag &= ~CBAUD; 379ab4382d2SGreg Kroah-Hartman if (old) { 380ab4382d2SGreg Kroah-Hartman baud = tty_termios_baud_rate(old); 381ab4382d2SGreg Kroah-Hartman if (!hung_up) 382ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 383ab4382d2SGreg Kroah-Hartman baud, baud); 384ab4382d2SGreg Kroah-Hartman old = NULL; 385ab4382d2SGreg Kroah-Hartman continue; 386ab4382d2SGreg Kroah-Hartman } 387ab4382d2SGreg Kroah-Hartman 388ab4382d2SGreg Kroah-Hartman /* 389ab4382d2SGreg Kroah-Hartman * As a last resort, if the range cannot be met then clip to 390ab4382d2SGreg Kroah-Hartman * the nearest chip supported rate. 391ab4382d2SGreg Kroah-Hartman */ 392ab4382d2SGreg Kroah-Hartman if (!hung_up) { 393ab4382d2SGreg Kroah-Hartman if (baud <= min) 394ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 395ab4382d2SGreg Kroah-Hartman min + 1, min + 1); 396ab4382d2SGreg Kroah-Hartman else 397ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 398ab4382d2SGreg Kroah-Hartman max - 1, max - 1); 399ab4382d2SGreg Kroah-Hartman } 400ab4382d2SGreg Kroah-Hartman } 401ab4382d2SGreg Kroah-Hartman /* Should never happen */ 402ab4382d2SGreg Kroah-Hartman WARN_ON(1); 403ab4382d2SGreg Kroah-Hartman return 0; 404ab4382d2SGreg Kroah-Hartman } 405ab4382d2SGreg Kroah-Hartman 406ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_get_baud_rate); 407ab4382d2SGreg Kroah-Hartman 408ab4382d2SGreg Kroah-Hartman /** 409ab4382d2SGreg Kroah-Hartman * uart_get_divisor - return uart clock divisor 410ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port. 411ab4382d2SGreg Kroah-Hartman * @baud: desired baud rate 412ab4382d2SGreg Kroah-Hartman * 413ab4382d2SGreg Kroah-Hartman * Calculate the uart clock divisor for the port. 414ab4382d2SGreg Kroah-Hartman */ 415ab4382d2SGreg Kroah-Hartman unsigned int 416ab4382d2SGreg Kroah-Hartman uart_get_divisor(struct uart_port *port, unsigned int baud) 417ab4382d2SGreg Kroah-Hartman { 418ab4382d2SGreg Kroah-Hartman unsigned int quot; 419ab4382d2SGreg Kroah-Hartman 420ab4382d2SGreg Kroah-Hartman /* 421ab4382d2SGreg Kroah-Hartman * Old custom speed handling. 422ab4382d2SGreg Kroah-Hartman */ 423ab4382d2SGreg Kroah-Hartman if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) 424ab4382d2SGreg Kroah-Hartman quot = port->custom_divisor; 425ab4382d2SGreg Kroah-Hartman else 426ab4382d2SGreg Kroah-Hartman quot = (port->uartclk + (8 * baud)) / (16 * baud); 427ab4382d2SGreg Kroah-Hartman 428ab4382d2SGreg Kroah-Hartman return quot; 429ab4382d2SGreg Kroah-Hartman } 430ab4382d2SGreg Kroah-Hartman 431ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_get_divisor); 432ab4382d2SGreg Kroah-Hartman 433ab4382d2SGreg Kroah-Hartman /* FIXME: Consistent locking policy */ 434ab4382d2SGreg Kroah-Hartman static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, 435ab4382d2SGreg Kroah-Hartman struct ktermios *old_termios) 436ab4382d2SGreg Kroah-Hartman { 437ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 438ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 439ab4382d2SGreg Kroah-Hartman struct ktermios *termios; 440ab4382d2SGreg Kroah-Hartman 441ab4382d2SGreg Kroah-Hartman /* 442ab4382d2SGreg Kroah-Hartman * If we have no tty, termios, or the port does not exist, 443ab4382d2SGreg Kroah-Hartman * then we can't set the parameters for this port. 444ab4382d2SGreg Kroah-Hartman */ 445ab4382d2SGreg Kroah-Hartman if (!tty || !tty->termios || uport->type == PORT_UNKNOWN) 446ab4382d2SGreg Kroah-Hartman return; 447ab4382d2SGreg Kroah-Hartman 448ab4382d2SGreg Kroah-Hartman termios = tty->termios; 449ab4382d2SGreg Kroah-Hartman 450ab4382d2SGreg Kroah-Hartman /* 451ab4382d2SGreg Kroah-Hartman * Set flags based on termios cflag 452ab4382d2SGreg Kroah-Hartman */ 453ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CRTSCTS) 454ab4382d2SGreg Kroah-Hartman set_bit(ASYNCB_CTS_FLOW, &port->flags); 455ab4382d2SGreg Kroah-Hartman else 456ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_CTS_FLOW, &port->flags); 457ab4382d2SGreg Kroah-Hartman 458ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CLOCAL) 459ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_CHECK_CD, &port->flags); 460ab4382d2SGreg Kroah-Hartman else 461ab4382d2SGreg Kroah-Hartman set_bit(ASYNCB_CHECK_CD, &port->flags); 462ab4382d2SGreg Kroah-Hartman 463ab4382d2SGreg Kroah-Hartman uport->ops->set_termios(uport, termios, old_termios); 464ab4382d2SGreg Kroah-Hartman } 465ab4382d2SGreg Kroah-Hartman 466ab4382d2SGreg Kroah-Hartman static inline int __uart_put_char(struct uart_port *port, 467ab4382d2SGreg Kroah-Hartman struct circ_buf *circ, unsigned char c) 468ab4382d2SGreg Kroah-Hartman { 469ab4382d2SGreg Kroah-Hartman unsigned long flags; 470ab4382d2SGreg Kroah-Hartman int ret = 0; 471ab4382d2SGreg Kroah-Hartman 472ab4382d2SGreg Kroah-Hartman if (!circ->buf) 473ab4382d2SGreg Kroah-Hartman return 0; 474ab4382d2SGreg Kroah-Hartman 475ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 476ab4382d2SGreg Kroah-Hartman if (uart_circ_chars_free(circ) != 0) { 477ab4382d2SGreg Kroah-Hartman circ->buf[circ->head] = c; 478ab4382d2SGreg Kroah-Hartman circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1); 479ab4382d2SGreg Kroah-Hartman ret = 1; 480ab4382d2SGreg Kroah-Hartman } 481ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 482ab4382d2SGreg Kroah-Hartman return ret; 483ab4382d2SGreg Kroah-Hartman } 484ab4382d2SGreg Kroah-Hartman 485ab4382d2SGreg Kroah-Hartman static int uart_put_char(struct tty_struct *tty, unsigned char ch) 486ab4382d2SGreg Kroah-Hartman { 487ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 488ab4382d2SGreg Kroah-Hartman 489ab4382d2SGreg Kroah-Hartman return __uart_put_char(state->uart_port, &state->xmit, ch); 490ab4382d2SGreg Kroah-Hartman } 491ab4382d2SGreg Kroah-Hartman 492ab4382d2SGreg Kroah-Hartman static void uart_flush_chars(struct tty_struct *tty) 493ab4382d2SGreg Kroah-Hartman { 494ab4382d2SGreg Kroah-Hartman uart_start(tty); 495ab4382d2SGreg Kroah-Hartman } 496ab4382d2SGreg Kroah-Hartman 497ab4382d2SGreg Kroah-Hartman static int uart_write(struct tty_struct *tty, 498ab4382d2SGreg Kroah-Hartman const unsigned char *buf, int count) 499ab4382d2SGreg Kroah-Hartman { 500ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 501ab4382d2SGreg Kroah-Hartman struct uart_port *port; 502ab4382d2SGreg Kroah-Hartman struct circ_buf *circ; 503ab4382d2SGreg Kroah-Hartman unsigned long flags; 504ab4382d2SGreg Kroah-Hartman int c, ret = 0; 505ab4382d2SGreg Kroah-Hartman 506ab4382d2SGreg Kroah-Hartman /* 507ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 508ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 509ab4382d2SGreg Kroah-Hartman */ 510ab4382d2SGreg Kroah-Hartman if (!state) { 511ab4382d2SGreg Kroah-Hartman WARN_ON(1); 512ab4382d2SGreg Kroah-Hartman return -EL3HLT; 513ab4382d2SGreg Kroah-Hartman } 514ab4382d2SGreg Kroah-Hartman 515ab4382d2SGreg Kroah-Hartman port = state->uart_port; 516ab4382d2SGreg Kroah-Hartman circ = &state->xmit; 517ab4382d2SGreg Kroah-Hartman 518ab4382d2SGreg Kroah-Hartman if (!circ->buf) 519ab4382d2SGreg Kroah-Hartman return 0; 520ab4382d2SGreg Kroah-Hartman 521ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 522ab4382d2SGreg Kroah-Hartman while (1) { 523ab4382d2SGreg Kroah-Hartman c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE); 524ab4382d2SGreg Kroah-Hartman if (count < c) 525ab4382d2SGreg Kroah-Hartman c = count; 526ab4382d2SGreg Kroah-Hartman if (c <= 0) 527ab4382d2SGreg Kroah-Hartman break; 528ab4382d2SGreg Kroah-Hartman memcpy(circ->buf + circ->head, buf, c); 529ab4382d2SGreg Kroah-Hartman circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1); 530ab4382d2SGreg Kroah-Hartman buf += c; 531ab4382d2SGreg Kroah-Hartman count -= c; 532ab4382d2SGreg Kroah-Hartman ret += c; 533ab4382d2SGreg Kroah-Hartman } 534ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 535ab4382d2SGreg Kroah-Hartman 536ab4382d2SGreg Kroah-Hartman uart_start(tty); 537ab4382d2SGreg Kroah-Hartman return ret; 538ab4382d2SGreg Kroah-Hartman } 539ab4382d2SGreg Kroah-Hartman 540ab4382d2SGreg Kroah-Hartman static int uart_write_room(struct tty_struct *tty) 541ab4382d2SGreg Kroah-Hartman { 542ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 543ab4382d2SGreg Kroah-Hartman unsigned long flags; 544ab4382d2SGreg Kroah-Hartman int ret; 545ab4382d2SGreg Kroah-Hartman 546ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&state->uart_port->lock, flags); 547ab4382d2SGreg Kroah-Hartman ret = uart_circ_chars_free(&state->xmit); 548ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&state->uart_port->lock, flags); 549ab4382d2SGreg Kroah-Hartman return ret; 550ab4382d2SGreg Kroah-Hartman } 551ab4382d2SGreg Kroah-Hartman 552ab4382d2SGreg Kroah-Hartman static int uart_chars_in_buffer(struct tty_struct *tty) 553ab4382d2SGreg Kroah-Hartman { 554ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 555ab4382d2SGreg Kroah-Hartman unsigned long flags; 556ab4382d2SGreg Kroah-Hartman int ret; 557ab4382d2SGreg Kroah-Hartman 558ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&state->uart_port->lock, flags); 559ab4382d2SGreg Kroah-Hartman ret = uart_circ_chars_pending(&state->xmit); 560ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&state->uart_port->lock, flags); 561ab4382d2SGreg Kroah-Hartman return ret; 562ab4382d2SGreg Kroah-Hartman } 563ab4382d2SGreg Kroah-Hartman 564ab4382d2SGreg Kroah-Hartman static void uart_flush_buffer(struct tty_struct *tty) 565ab4382d2SGreg Kroah-Hartman { 566ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 567ab4382d2SGreg Kroah-Hartman struct uart_port *port; 568ab4382d2SGreg Kroah-Hartman unsigned long flags; 569ab4382d2SGreg Kroah-Hartman 570ab4382d2SGreg Kroah-Hartman /* 571ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 572ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 573ab4382d2SGreg Kroah-Hartman */ 574ab4382d2SGreg Kroah-Hartman if (!state) { 575ab4382d2SGreg Kroah-Hartman WARN_ON(1); 576ab4382d2SGreg Kroah-Hartman return; 577ab4382d2SGreg Kroah-Hartman } 578ab4382d2SGreg Kroah-Hartman 579ab4382d2SGreg Kroah-Hartman port = state->uart_port; 580ab4382d2SGreg Kroah-Hartman pr_debug("uart_flush_buffer(%d) called\n", tty->index); 581ab4382d2SGreg Kroah-Hartman 582ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 583ab4382d2SGreg Kroah-Hartman uart_circ_clear(&state->xmit); 584ab4382d2SGreg Kroah-Hartman if (port->ops->flush_buffer) 585ab4382d2SGreg Kroah-Hartman port->ops->flush_buffer(port); 586ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 587ab4382d2SGreg Kroah-Hartman tty_wakeup(tty); 588ab4382d2SGreg Kroah-Hartman } 589ab4382d2SGreg Kroah-Hartman 590ab4382d2SGreg Kroah-Hartman /* 591ab4382d2SGreg Kroah-Hartman * This function is used to send a high-priority XON/XOFF character to 592ab4382d2SGreg Kroah-Hartman * the device 593ab4382d2SGreg Kroah-Hartman */ 594ab4382d2SGreg Kroah-Hartman static void uart_send_xchar(struct tty_struct *tty, char ch) 595ab4382d2SGreg Kroah-Hartman { 596ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 597ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 598ab4382d2SGreg Kroah-Hartman unsigned long flags; 599ab4382d2SGreg Kroah-Hartman 600ab4382d2SGreg Kroah-Hartman if (port->ops->send_xchar) 601ab4382d2SGreg Kroah-Hartman port->ops->send_xchar(port, ch); 602ab4382d2SGreg Kroah-Hartman else { 603ab4382d2SGreg Kroah-Hartman port->x_char = ch; 604ab4382d2SGreg Kroah-Hartman if (ch) { 605ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 606ab4382d2SGreg Kroah-Hartman port->ops->start_tx(port); 607ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 608ab4382d2SGreg Kroah-Hartman } 609ab4382d2SGreg Kroah-Hartman } 610ab4382d2SGreg Kroah-Hartman } 611ab4382d2SGreg Kroah-Hartman 612ab4382d2SGreg Kroah-Hartman static void uart_throttle(struct tty_struct *tty) 613ab4382d2SGreg Kroah-Hartman { 614ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 615ab4382d2SGreg Kroah-Hartman 616ab4382d2SGreg Kroah-Hartman if (I_IXOFF(tty)) 617ab4382d2SGreg Kroah-Hartman uart_send_xchar(tty, STOP_CHAR(tty)); 618ab4382d2SGreg Kroah-Hartman 619ab4382d2SGreg Kroah-Hartman if (tty->termios->c_cflag & CRTSCTS) 620ab4382d2SGreg Kroah-Hartman uart_clear_mctrl(state->uart_port, TIOCM_RTS); 621ab4382d2SGreg Kroah-Hartman } 622ab4382d2SGreg Kroah-Hartman 623ab4382d2SGreg Kroah-Hartman static void uart_unthrottle(struct tty_struct *tty) 624ab4382d2SGreg Kroah-Hartman { 625ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 626ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 627ab4382d2SGreg Kroah-Hartman 628ab4382d2SGreg Kroah-Hartman if (I_IXOFF(tty)) { 629ab4382d2SGreg Kroah-Hartman if (port->x_char) 630ab4382d2SGreg Kroah-Hartman port->x_char = 0; 631ab4382d2SGreg Kroah-Hartman else 632ab4382d2SGreg Kroah-Hartman uart_send_xchar(tty, START_CHAR(tty)); 633ab4382d2SGreg Kroah-Hartman } 634ab4382d2SGreg Kroah-Hartman 635ab4382d2SGreg Kroah-Hartman if (tty->termios->c_cflag & CRTSCTS) 636ab4382d2SGreg Kroah-Hartman uart_set_mctrl(port, TIOCM_RTS); 637ab4382d2SGreg Kroah-Hartman } 638ab4382d2SGreg Kroah-Hartman 639ab4382d2SGreg Kroah-Hartman static int uart_get_info(struct uart_state *state, 640ab4382d2SGreg Kroah-Hartman struct serial_struct __user *retinfo) 641ab4382d2SGreg Kroah-Hartman { 642ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 643ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 644ab4382d2SGreg Kroah-Hartman struct serial_struct tmp; 645ab4382d2SGreg Kroah-Hartman 646ab4382d2SGreg Kroah-Hartman memset(&tmp, 0, sizeof(tmp)); 647ab4382d2SGreg Kroah-Hartman 648ab4382d2SGreg Kroah-Hartman /* Ensure the state we copy is consistent and no hardware changes 649ab4382d2SGreg Kroah-Hartman occur as we go */ 650ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 651ab4382d2SGreg Kroah-Hartman 652ab4382d2SGreg Kroah-Hartman tmp.type = uport->type; 653ab4382d2SGreg Kroah-Hartman tmp.line = uport->line; 654ab4382d2SGreg Kroah-Hartman tmp.port = uport->iobase; 655ab4382d2SGreg Kroah-Hartman if (HIGH_BITS_OFFSET) 656ab4382d2SGreg Kroah-Hartman tmp.port_high = (long) uport->iobase >> HIGH_BITS_OFFSET; 657ab4382d2SGreg Kroah-Hartman tmp.irq = uport->irq; 658ab4382d2SGreg Kroah-Hartman tmp.flags = uport->flags; 659ab4382d2SGreg Kroah-Hartman tmp.xmit_fifo_size = uport->fifosize; 660ab4382d2SGreg Kroah-Hartman tmp.baud_base = uport->uartclk / 16; 6614cb0fbfdSJiri Slaby tmp.close_delay = jiffies_to_msecs(port->close_delay) / 10; 662ab4382d2SGreg Kroah-Hartman tmp.closing_wait = port->closing_wait == ASYNC_CLOSING_WAIT_NONE ? 663ab4382d2SGreg Kroah-Hartman ASYNC_CLOSING_WAIT_NONE : 6644cb0fbfdSJiri Slaby jiffies_to_msecs(port->closing_wait) / 10; 665ab4382d2SGreg Kroah-Hartman tmp.custom_divisor = uport->custom_divisor; 666ab4382d2SGreg Kroah-Hartman tmp.hub6 = uport->hub6; 667ab4382d2SGreg Kroah-Hartman tmp.io_type = uport->iotype; 668ab4382d2SGreg Kroah-Hartman tmp.iomem_reg_shift = uport->regshift; 669ab4382d2SGreg Kroah-Hartman tmp.iomem_base = (void *)(unsigned long)uport->mapbase; 670ab4382d2SGreg Kroah-Hartman 671ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 672ab4382d2SGreg Kroah-Hartman 673ab4382d2SGreg Kroah-Hartman if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) 674ab4382d2SGreg Kroah-Hartman return -EFAULT; 675ab4382d2SGreg Kroah-Hartman return 0; 676ab4382d2SGreg Kroah-Hartman } 677ab4382d2SGreg Kroah-Hartman 678ab4382d2SGreg Kroah-Hartman static int uart_set_info(struct tty_struct *tty, struct uart_state *state, 679ab4382d2SGreg Kroah-Hartman struct serial_struct __user *newinfo) 680ab4382d2SGreg Kroah-Hartman { 681ab4382d2SGreg Kroah-Hartman struct serial_struct new_serial; 682ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 683ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 684ab4382d2SGreg Kroah-Hartman unsigned long new_port; 685ab4382d2SGreg Kroah-Hartman unsigned int change_irq, change_port, closing_wait; 686ab4382d2SGreg Kroah-Hartman unsigned int old_custom_divisor, close_delay; 687ab4382d2SGreg Kroah-Hartman upf_t old_flags, new_flags; 688ab4382d2SGreg Kroah-Hartman int retval = 0; 689ab4382d2SGreg Kroah-Hartman 690ab4382d2SGreg Kroah-Hartman if (copy_from_user(&new_serial, newinfo, sizeof(new_serial))) 691ab4382d2SGreg Kroah-Hartman return -EFAULT; 692ab4382d2SGreg Kroah-Hartman 693ab4382d2SGreg Kroah-Hartman new_port = new_serial.port; 694ab4382d2SGreg Kroah-Hartman if (HIGH_BITS_OFFSET) 695ab4382d2SGreg Kroah-Hartman new_port += (unsigned long) new_serial.port_high << HIGH_BITS_OFFSET; 696ab4382d2SGreg Kroah-Hartman 697ab4382d2SGreg Kroah-Hartman new_serial.irq = irq_canonicalize(new_serial.irq); 6984cb0fbfdSJiri Slaby close_delay = msecs_to_jiffies(new_serial.close_delay * 10); 699ab4382d2SGreg Kroah-Hartman closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ? 7004cb0fbfdSJiri Slaby ASYNC_CLOSING_WAIT_NONE : 7014cb0fbfdSJiri Slaby msecs_to_jiffies(new_serial.closing_wait * 10); 702ab4382d2SGreg Kroah-Hartman 703ab4382d2SGreg Kroah-Hartman /* 704ab4382d2SGreg Kroah-Hartman * This semaphore protects port->count. It is also 705ab4382d2SGreg Kroah-Hartman * very useful to prevent opens. Also, take the 706ab4382d2SGreg Kroah-Hartman * port configuration semaphore to make sure that a 707ab4382d2SGreg Kroah-Hartman * module insertion/removal doesn't change anything 708ab4382d2SGreg Kroah-Hartman * under us. 709ab4382d2SGreg Kroah-Hartman */ 710ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 711ab4382d2SGreg Kroah-Hartman 712ab4382d2SGreg Kroah-Hartman change_irq = !(uport->flags & UPF_FIXED_PORT) 713ab4382d2SGreg Kroah-Hartman && new_serial.irq != uport->irq; 714ab4382d2SGreg Kroah-Hartman 715ab4382d2SGreg Kroah-Hartman /* 716ab4382d2SGreg Kroah-Hartman * Since changing the 'type' of the port changes its resource 717ab4382d2SGreg Kroah-Hartman * allocations, we should treat type changes the same as 718ab4382d2SGreg Kroah-Hartman * IO port changes. 719ab4382d2SGreg Kroah-Hartman */ 720ab4382d2SGreg Kroah-Hartman change_port = !(uport->flags & UPF_FIXED_PORT) 721ab4382d2SGreg Kroah-Hartman && (new_port != uport->iobase || 722ab4382d2SGreg Kroah-Hartman (unsigned long)new_serial.iomem_base != uport->mapbase || 723ab4382d2SGreg Kroah-Hartman new_serial.hub6 != uport->hub6 || 724ab4382d2SGreg Kroah-Hartman new_serial.io_type != uport->iotype || 725ab4382d2SGreg Kroah-Hartman new_serial.iomem_reg_shift != uport->regshift || 726ab4382d2SGreg Kroah-Hartman new_serial.type != uport->type); 727ab4382d2SGreg Kroah-Hartman 728ab4382d2SGreg Kroah-Hartman old_flags = uport->flags; 729ab4382d2SGreg Kroah-Hartman new_flags = new_serial.flags; 730ab4382d2SGreg Kroah-Hartman old_custom_divisor = uport->custom_divisor; 731ab4382d2SGreg Kroah-Hartman 732ab4382d2SGreg Kroah-Hartman if (!capable(CAP_SYS_ADMIN)) { 733ab4382d2SGreg Kroah-Hartman retval = -EPERM; 734ab4382d2SGreg Kroah-Hartman if (change_irq || change_port || 735ab4382d2SGreg Kroah-Hartman (new_serial.baud_base != uport->uartclk / 16) || 736ab4382d2SGreg Kroah-Hartman (close_delay != port->close_delay) || 737ab4382d2SGreg Kroah-Hartman (closing_wait != port->closing_wait) || 738ab4382d2SGreg Kroah-Hartman (new_serial.xmit_fifo_size && 739ab4382d2SGreg Kroah-Hartman new_serial.xmit_fifo_size != uport->fifosize) || 740ab4382d2SGreg Kroah-Hartman (((new_flags ^ old_flags) & ~UPF_USR_MASK) != 0)) 741ab4382d2SGreg Kroah-Hartman goto exit; 742ab4382d2SGreg Kroah-Hartman uport->flags = ((uport->flags & ~UPF_USR_MASK) | 743ab4382d2SGreg Kroah-Hartman (new_flags & UPF_USR_MASK)); 744ab4382d2SGreg Kroah-Hartman uport->custom_divisor = new_serial.custom_divisor; 745ab4382d2SGreg Kroah-Hartman goto check_and_exit; 746ab4382d2SGreg Kroah-Hartman } 747ab4382d2SGreg Kroah-Hartman 748ab4382d2SGreg Kroah-Hartman /* 749ab4382d2SGreg Kroah-Hartman * Ask the low level driver to verify the settings. 750ab4382d2SGreg Kroah-Hartman */ 751ab4382d2SGreg Kroah-Hartman if (uport->ops->verify_port) 752ab4382d2SGreg Kroah-Hartman retval = uport->ops->verify_port(uport, &new_serial); 753ab4382d2SGreg Kroah-Hartman 754ab4382d2SGreg Kroah-Hartman if ((new_serial.irq >= nr_irqs) || (new_serial.irq < 0) || 755ab4382d2SGreg Kroah-Hartman (new_serial.baud_base < 9600)) 756ab4382d2SGreg Kroah-Hartman retval = -EINVAL; 757ab4382d2SGreg Kroah-Hartman 758ab4382d2SGreg Kroah-Hartman if (retval) 759ab4382d2SGreg Kroah-Hartman goto exit; 760ab4382d2SGreg Kroah-Hartman 761ab4382d2SGreg Kroah-Hartman if (change_port || change_irq) { 762ab4382d2SGreg Kroah-Hartman retval = -EBUSY; 763ab4382d2SGreg Kroah-Hartman 764ab4382d2SGreg Kroah-Hartman /* 765ab4382d2SGreg Kroah-Hartman * Make sure that we are the sole user of this port. 766ab4382d2SGreg Kroah-Hartman */ 767ab4382d2SGreg Kroah-Hartman if (tty_port_users(port) > 1) 768ab4382d2SGreg Kroah-Hartman goto exit; 769ab4382d2SGreg Kroah-Hartman 770ab4382d2SGreg Kroah-Hartman /* 771ab4382d2SGreg Kroah-Hartman * We need to shutdown the serial port at the old 772ab4382d2SGreg Kroah-Hartman * port/type/irq combination. 773ab4382d2SGreg Kroah-Hartman */ 774ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 775ab4382d2SGreg Kroah-Hartman } 776ab4382d2SGreg Kroah-Hartman 777ab4382d2SGreg Kroah-Hartman if (change_port) { 778ab4382d2SGreg Kroah-Hartman unsigned long old_iobase, old_mapbase; 779ab4382d2SGreg Kroah-Hartman unsigned int old_type, old_iotype, old_hub6, old_shift; 780ab4382d2SGreg Kroah-Hartman 781ab4382d2SGreg Kroah-Hartman old_iobase = uport->iobase; 782ab4382d2SGreg Kroah-Hartman old_mapbase = uport->mapbase; 783ab4382d2SGreg Kroah-Hartman old_type = uport->type; 784ab4382d2SGreg Kroah-Hartman old_hub6 = uport->hub6; 785ab4382d2SGreg Kroah-Hartman old_iotype = uport->iotype; 786ab4382d2SGreg Kroah-Hartman old_shift = uport->regshift; 787ab4382d2SGreg Kroah-Hartman 788ab4382d2SGreg Kroah-Hartman /* 789ab4382d2SGreg Kroah-Hartman * Free and release old regions 790ab4382d2SGreg Kroah-Hartman */ 791ab4382d2SGreg Kroah-Hartman if (old_type != PORT_UNKNOWN) 792ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 793ab4382d2SGreg Kroah-Hartman 794ab4382d2SGreg Kroah-Hartman uport->iobase = new_port; 795ab4382d2SGreg Kroah-Hartman uport->type = new_serial.type; 796ab4382d2SGreg Kroah-Hartman uport->hub6 = new_serial.hub6; 797ab4382d2SGreg Kroah-Hartman uport->iotype = new_serial.io_type; 798ab4382d2SGreg Kroah-Hartman uport->regshift = new_serial.iomem_reg_shift; 799ab4382d2SGreg Kroah-Hartman uport->mapbase = (unsigned long)new_serial.iomem_base; 800ab4382d2SGreg Kroah-Hartman 801ab4382d2SGreg Kroah-Hartman /* 802ab4382d2SGreg Kroah-Hartman * Claim and map the new regions 803ab4382d2SGreg Kroah-Hartman */ 804ab4382d2SGreg Kroah-Hartman if (uport->type != PORT_UNKNOWN) { 805ab4382d2SGreg Kroah-Hartman retval = uport->ops->request_port(uport); 806ab4382d2SGreg Kroah-Hartman } else { 807ab4382d2SGreg Kroah-Hartman /* Always success - Jean II */ 808ab4382d2SGreg Kroah-Hartman retval = 0; 809ab4382d2SGreg Kroah-Hartman } 810ab4382d2SGreg Kroah-Hartman 811ab4382d2SGreg Kroah-Hartman /* 812ab4382d2SGreg Kroah-Hartman * If we fail to request resources for the 813ab4382d2SGreg Kroah-Hartman * new port, try to restore the old settings. 814ab4382d2SGreg Kroah-Hartman */ 815ab4382d2SGreg Kroah-Hartman if (retval && old_type != PORT_UNKNOWN) { 816ab4382d2SGreg Kroah-Hartman uport->iobase = old_iobase; 817ab4382d2SGreg Kroah-Hartman uport->type = old_type; 818ab4382d2SGreg Kroah-Hartman uport->hub6 = old_hub6; 819ab4382d2SGreg Kroah-Hartman uport->iotype = old_iotype; 820ab4382d2SGreg Kroah-Hartman uport->regshift = old_shift; 821ab4382d2SGreg Kroah-Hartman uport->mapbase = old_mapbase; 822ab4382d2SGreg Kroah-Hartman retval = uport->ops->request_port(uport); 823ab4382d2SGreg Kroah-Hartman /* 824ab4382d2SGreg Kroah-Hartman * If we failed to restore the old settings, 825ab4382d2SGreg Kroah-Hartman * we fail like this. 826ab4382d2SGreg Kroah-Hartman */ 827ab4382d2SGreg Kroah-Hartman if (retval) 828ab4382d2SGreg Kroah-Hartman uport->type = PORT_UNKNOWN; 829ab4382d2SGreg Kroah-Hartman 830ab4382d2SGreg Kroah-Hartman /* 831ab4382d2SGreg Kroah-Hartman * We failed anyway. 832ab4382d2SGreg Kroah-Hartman */ 833ab4382d2SGreg Kroah-Hartman retval = -EBUSY; 834ab4382d2SGreg Kroah-Hartman /* Added to return the correct error -Ram Gupta */ 835ab4382d2SGreg Kroah-Hartman goto exit; 836ab4382d2SGreg Kroah-Hartman } 837ab4382d2SGreg Kroah-Hartman } 838ab4382d2SGreg Kroah-Hartman 839ab4382d2SGreg Kroah-Hartman if (change_irq) 840ab4382d2SGreg Kroah-Hartman uport->irq = new_serial.irq; 841ab4382d2SGreg Kroah-Hartman if (!(uport->flags & UPF_FIXED_PORT)) 842ab4382d2SGreg Kroah-Hartman uport->uartclk = new_serial.baud_base * 16; 843ab4382d2SGreg Kroah-Hartman uport->flags = (uport->flags & ~UPF_CHANGE_MASK) | 844ab4382d2SGreg Kroah-Hartman (new_flags & UPF_CHANGE_MASK); 845ab4382d2SGreg Kroah-Hartman uport->custom_divisor = new_serial.custom_divisor; 846ab4382d2SGreg Kroah-Hartman port->close_delay = close_delay; 847ab4382d2SGreg Kroah-Hartman port->closing_wait = closing_wait; 848ab4382d2SGreg Kroah-Hartman if (new_serial.xmit_fifo_size) 849ab4382d2SGreg Kroah-Hartman uport->fifosize = new_serial.xmit_fifo_size; 850ab4382d2SGreg Kroah-Hartman if (port->tty) 851ab4382d2SGreg Kroah-Hartman port->tty->low_latency = 852ab4382d2SGreg Kroah-Hartman (uport->flags & UPF_LOW_LATENCY) ? 1 : 0; 853ab4382d2SGreg Kroah-Hartman 854ab4382d2SGreg Kroah-Hartman check_and_exit: 855ab4382d2SGreg Kroah-Hartman retval = 0; 856ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) 857ab4382d2SGreg Kroah-Hartman goto exit; 858ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_INITIALIZED) { 859ab4382d2SGreg Kroah-Hartman if (((old_flags ^ uport->flags) & UPF_SPD_MASK) || 860ab4382d2SGreg Kroah-Hartman old_custom_divisor != uport->custom_divisor) { 861ab4382d2SGreg Kroah-Hartman /* 862ab4382d2SGreg Kroah-Hartman * If they're setting up a custom divisor or speed, 863ab4382d2SGreg Kroah-Hartman * instead of clearing it, then bitch about it. No 864ab4382d2SGreg Kroah-Hartman * need to rate-limit; it's CAP_SYS_ADMIN only. 865ab4382d2SGreg Kroah-Hartman */ 866ab4382d2SGreg Kroah-Hartman if (uport->flags & UPF_SPD_MASK) { 867ab4382d2SGreg Kroah-Hartman char buf[64]; 868ab4382d2SGreg Kroah-Hartman printk(KERN_NOTICE 869ab4382d2SGreg Kroah-Hartman "%s sets custom speed on %s. This " 870ab4382d2SGreg Kroah-Hartman "is deprecated.\n", current->comm, 871ab4382d2SGreg Kroah-Hartman tty_name(port->tty, buf)); 872ab4382d2SGreg Kroah-Hartman } 873ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 874ab4382d2SGreg Kroah-Hartman } 875ab4382d2SGreg Kroah-Hartman } else 876ab4382d2SGreg Kroah-Hartman retval = uart_startup(tty, state, 1); 877ab4382d2SGreg Kroah-Hartman exit: 878ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 879ab4382d2SGreg Kroah-Hartman return retval; 880ab4382d2SGreg Kroah-Hartman } 881ab4382d2SGreg Kroah-Hartman 882ab4382d2SGreg Kroah-Hartman /** 883ab4382d2SGreg Kroah-Hartman * uart_get_lsr_info - get line status register info 884ab4382d2SGreg Kroah-Hartman * @tty: tty associated with the UART 885ab4382d2SGreg Kroah-Hartman * @state: UART being queried 886ab4382d2SGreg Kroah-Hartman * @value: returned modem value 887ab4382d2SGreg Kroah-Hartman * 888ab4382d2SGreg Kroah-Hartman * Note: uart_ioctl protects us against hangups. 889ab4382d2SGreg Kroah-Hartman */ 890ab4382d2SGreg Kroah-Hartman static int uart_get_lsr_info(struct tty_struct *tty, 891ab4382d2SGreg Kroah-Hartman struct uart_state *state, unsigned int __user *value) 892ab4382d2SGreg Kroah-Hartman { 893ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 894ab4382d2SGreg Kroah-Hartman unsigned int result; 895ab4382d2SGreg Kroah-Hartman 896ab4382d2SGreg Kroah-Hartman result = uport->ops->tx_empty(uport); 897ab4382d2SGreg Kroah-Hartman 898ab4382d2SGreg Kroah-Hartman /* 899ab4382d2SGreg Kroah-Hartman * If we're about to load something into the transmit 900ab4382d2SGreg Kroah-Hartman * register, we'll pretend the transmitter isn't empty to 901ab4382d2SGreg Kroah-Hartman * avoid a race condition (depending on when the transmit 902ab4382d2SGreg Kroah-Hartman * interrupt happens). 903ab4382d2SGreg Kroah-Hartman */ 904ab4382d2SGreg Kroah-Hartman if (uport->x_char || 905ab4382d2SGreg Kroah-Hartman ((uart_circ_chars_pending(&state->xmit) > 0) && 906ab4382d2SGreg Kroah-Hartman !tty->stopped && !tty->hw_stopped)) 907ab4382d2SGreg Kroah-Hartman result &= ~TIOCSER_TEMT; 908ab4382d2SGreg Kroah-Hartman 909ab4382d2SGreg Kroah-Hartman return put_user(result, value); 910ab4382d2SGreg Kroah-Hartman } 911ab4382d2SGreg Kroah-Hartman 91260b33c13SAlan Cox static int uart_tiocmget(struct tty_struct *tty) 913ab4382d2SGreg Kroah-Hartman { 914ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 915ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 916ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 917ab4382d2SGreg Kroah-Hartman int result = -EIO; 918ab4382d2SGreg Kroah-Hartman 919ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 92060b33c13SAlan Cox if (!(tty->flags & (1 << TTY_IO_ERROR))) { 921ab4382d2SGreg Kroah-Hartman result = uport->mctrl; 922ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 923ab4382d2SGreg Kroah-Hartman result |= uport->ops->get_mctrl(uport); 924ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 925ab4382d2SGreg Kroah-Hartman } 926ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 927ab4382d2SGreg Kroah-Hartman 928ab4382d2SGreg Kroah-Hartman return result; 929ab4382d2SGreg Kroah-Hartman } 930ab4382d2SGreg Kroah-Hartman 931ab4382d2SGreg Kroah-Hartman static int 93220b9d177SAlan Cox uart_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear) 933ab4382d2SGreg Kroah-Hartman { 934ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 935ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 936ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 937ab4382d2SGreg Kroah-Hartman int ret = -EIO; 938ab4382d2SGreg Kroah-Hartman 939ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 94020b9d177SAlan Cox if (!(tty->flags & (1 << TTY_IO_ERROR))) { 941ab4382d2SGreg Kroah-Hartman uart_update_mctrl(uport, set, clear); 942ab4382d2SGreg Kroah-Hartman ret = 0; 943ab4382d2SGreg Kroah-Hartman } 944ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 945ab4382d2SGreg Kroah-Hartman return ret; 946ab4382d2SGreg Kroah-Hartman } 947ab4382d2SGreg Kroah-Hartman 948ab4382d2SGreg Kroah-Hartman static int uart_break_ctl(struct tty_struct *tty, int break_state) 949ab4382d2SGreg Kroah-Hartman { 950ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 951ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 952ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 953ab4382d2SGreg Kroah-Hartman 954ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 955ab4382d2SGreg Kroah-Hartman 956ab4382d2SGreg Kroah-Hartman if (uport->type != PORT_UNKNOWN) 957ab4382d2SGreg Kroah-Hartman uport->ops->break_ctl(uport, break_state); 958ab4382d2SGreg Kroah-Hartman 959ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 960ab4382d2SGreg Kroah-Hartman return 0; 961ab4382d2SGreg Kroah-Hartman } 962ab4382d2SGreg Kroah-Hartman 963ab4382d2SGreg Kroah-Hartman static int uart_do_autoconfig(struct tty_struct *tty,struct uart_state *state) 964ab4382d2SGreg Kroah-Hartman { 965ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 966ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 967ab4382d2SGreg Kroah-Hartman int flags, ret; 968ab4382d2SGreg Kroah-Hartman 969ab4382d2SGreg Kroah-Hartman if (!capable(CAP_SYS_ADMIN)) 970ab4382d2SGreg Kroah-Hartman return -EPERM; 971ab4382d2SGreg Kroah-Hartman 972ab4382d2SGreg Kroah-Hartman /* 973ab4382d2SGreg Kroah-Hartman * Take the per-port semaphore. This prevents count from 974ab4382d2SGreg Kroah-Hartman * changing, and hence any extra opens of the port while 975ab4382d2SGreg Kroah-Hartman * we're auto-configuring. 976ab4382d2SGreg Kroah-Hartman */ 977ab4382d2SGreg Kroah-Hartman if (mutex_lock_interruptible(&port->mutex)) 978ab4382d2SGreg Kroah-Hartman return -ERESTARTSYS; 979ab4382d2SGreg Kroah-Hartman 980ab4382d2SGreg Kroah-Hartman ret = -EBUSY; 981ab4382d2SGreg Kroah-Hartman if (tty_port_users(port) == 1) { 982ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 983ab4382d2SGreg Kroah-Hartman 984ab4382d2SGreg Kroah-Hartman /* 985ab4382d2SGreg Kroah-Hartman * If we already have a port type configured, 986ab4382d2SGreg Kroah-Hartman * we must release its resources. 987ab4382d2SGreg Kroah-Hartman */ 988ab4382d2SGreg Kroah-Hartman if (uport->type != PORT_UNKNOWN) 989ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 990ab4382d2SGreg Kroah-Hartman 991ab4382d2SGreg Kroah-Hartman flags = UART_CONFIG_TYPE; 992ab4382d2SGreg Kroah-Hartman if (uport->flags & UPF_AUTO_IRQ) 993ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_IRQ; 994ab4382d2SGreg Kroah-Hartman 995ab4382d2SGreg Kroah-Hartman /* 996ab4382d2SGreg Kroah-Hartman * This will claim the ports resources if 997ab4382d2SGreg Kroah-Hartman * a port is found. 998ab4382d2SGreg Kroah-Hartman */ 999ab4382d2SGreg Kroah-Hartman uport->ops->config_port(uport, flags); 1000ab4382d2SGreg Kroah-Hartman 1001ab4382d2SGreg Kroah-Hartman ret = uart_startup(tty, state, 1); 1002ab4382d2SGreg Kroah-Hartman } 1003ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1004ab4382d2SGreg Kroah-Hartman return ret; 1005ab4382d2SGreg Kroah-Hartman } 1006ab4382d2SGreg Kroah-Hartman 1007ab4382d2SGreg Kroah-Hartman /* 1008ab4382d2SGreg Kroah-Hartman * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change 1009ab4382d2SGreg Kroah-Hartman * - mask passed in arg for lines of interest 1010ab4382d2SGreg Kroah-Hartman * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) 1011ab4382d2SGreg Kroah-Hartman * Caller should use TIOCGICOUNT to see which one it was 1012ab4382d2SGreg Kroah-Hartman * 1013ab4382d2SGreg Kroah-Hartman * FIXME: This wants extracting into a common all driver implementation 1014ab4382d2SGreg Kroah-Hartman * of TIOCMWAIT using tty_port. 1015ab4382d2SGreg Kroah-Hartman */ 1016ab4382d2SGreg Kroah-Hartman static int 1017ab4382d2SGreg Kroah-Hartman uart_wait_modem_status(struct uart_state *state, unsigned long arg) 1018ab4382d2SGreg Kroah-Hartman { 1019ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1020ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1021ab4382d2SGreg Kroah-Hartman DECLARE_WAITQUEUE(wait, current); 1022ab4382d2SGreg Kroah-Hartman struct uart_icount cprev, cnow; 1023ab4382d2SGreg Kroah-Hartman int ret; 1024ab4382d2SGreg Kroah-Hartman 1025ab4382d2SGreg Kroah-Hartman /* 1026ab4382d2SGreg Kroah-Hartman * note the counters on entry 1027ab4382d2SGreg Kroah-Hartman */ 1028ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1029ab4382d2SGreg Kroah-Hartman memcpy(&cprev, &uport->icount, sizeof(struct uart_icount)); 1030ab4382d2SGreg Kroah-Hartman 1031ab4382d2SGreg Kroah-Hartman /* 1032ab4382d2SGreg Kroah-Hartman * Force modem status interrupts on 1033ab4382d2SGreg Kroah-Hartman */ 1034ab4382d2SGreg Kroah-Hartman uport->ops->enable_ms(uport); 1035ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1036ab4382d2SGreg Kroah-Hartman 1037ab4382d2SGreg Kroah-Hartman add_wait_queue(&port->delta_msr_wait, &wait); 1038ab4382d2SGreg Kroah-Hartman for (;;) { 1039ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1040ab4382d2SGreg Kroah-Hartman memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); 1041ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1042ab4382d2SGreg Kroah-Hartman 1043ab4382d2SGreg Kroah-Hartman set_current_state(TASK_INTERRUPTIBLE); 1044ab4382d2SGreg Kroah-Hartman 1045ab4382d2SGreg Kroah-Hartman if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || 1046ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || 1047ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || 1048ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) { 1049ab4382d2SGreg Kroah-Hartman ret = 0; 1050ab4382d2SGreg Kroah-Hartman break; 1051ab4382d2SGreg Kroah-Hartman } 1052ab4382d2SGreg Kroah-Hartman 1053ab4382d2SGreg Kroah-Hartman schedule(); 1054ab4382d2SGreg Kroah-Hartman 1055ab4382d2SGreg Kroah-Hartman /* see if a signal did it */ 1056ab4382d2SGreg Kroah-Hartman if (signal_pending(current)) { 1057ab4382d2SGreg Kroah-Hartman ret = -ERESTARTSYS; 1058ab4382d2SGreg Kroah-Hartman break; 1059ab4382d2SGreg Kroah-Hartman } 1060ab4382d2SGreg Kroah-Hartman 1061ab4382d2SGreg Kroah-Hartman cprev = cnow; 1062ab4382d2SGreg Kroah-Hartman } 1063ab4382d2SGreg Kroah-Hartman 1064ab4382d2SGreg Kroah-Hartman current->state = TASK_RUNNING; 1065ab4382d2SGreg Kroah-Hartman remove_wait_queue(&port->delta_msr_wait, &wait); 1066ab4382d2SGreg Kroah-Hartman 1067ab4382d2SGreg Kroah-Hartman return ret; 1068ab4382d2SGreg Kroah-Hartman } 1069ab4382d2SGreg Kroah-Hartman 1070ab4382d2SGreg Kroah-Hartman /* 1071ab4382d2SGreg Kroah-Hartman * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) 1072ab4382d2SGreg Kroah-Hartman * Return: write counters to the user passed counter struct 1073ab4382d2SGreg Kroah-Hartman * NB: both 1->0 and 0->1 transitions are counted except for 1074ab4382d2SGreg Kroah-Hartman * RI where only 0->1 is counted. 1075ab4382d2SGreg Kroah-Hartman */ 1076ab4382d2SGreg Kroah-Hartman static int uart_get_icount(struct tty_struct *tty, 1077ab4382d2SGreg Kroah-Hartman struct serial_icounter_struct *icount) 1078ab4382d2SGreg Kroah-Hartman { 1079ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1080ab4382d2SGreg Kroah-Hartman struct uart_icount cnow; 1081ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1082ab4382d2SGreg Kroah-Hartman 1083ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1084ab4382d2SGreg Kroah-Hartman memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); 1085ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1086ab4382d2SGreg Kroah-Hartman 1087ab4382d2SGreg Kroah-Hartman icount->cts = cnow.cts; 1088ab4382d2SGreg Kroah-Hartman icount->dsr = cnow.dsr; 1089ab4382d2SGreg Kroah-Hartman icount->rng = cnow.rng; 1090ab4382d2SGreg Kroah-Hartman icount->dcd = cnow.dcd; 1091ab4382d2SGreg Kroah-Hartman icount->rx = cnow.rx; 1092ab4382d2SGreg Kroah-Hartman icount->tx = cnow.tx; 1093ab4382d2SGreg Kroah-Hartman icount->frame = cnow.frame; 1094ab4382d2SGreg Kroah-Hartman icount->overrun = cnow.overrun; 1095ab4382d2SGreg Kroah-Hartman icount->parity = cnow.parity; 1096ab4382d2SGreg Kroah-Hartman icount->brk = cnow.brk; 1097ab4382d2SGreg Kroah-Hartman icount->buf_overrun = cnow.buf_overrun; 1098ab4382d2SGreg Kroah-Hartman 1099ab4382d2SGreg Kroah-Hartman return 0; 1100ab4382d2SGreg Kroah-Hartman } 1101ab4382d2SGreg Kroah-Hartman 1102ab4382d2SGreg Kroah-Hartman /* 1103ab4382d2SGreg Kroah-Hartman * Called via sys_ioctl. We can use spin_lock_irq() here. 1104ab4382d2SGreg Kroah-Hartman */ 1105ab4382d2SGreg Kroah-Hartman static int 11066caa76b7SAlan Cox uart_ioctl(struct tty_struct *tty, unsigned int cmd, 1107ab4382d2SGreg Kroah-Hartman unsigned long arg) 1108ab4382d2SGreg Kroah-Hartman { 1109ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1110ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1111ab4382d2SGreg Kroah-Hartman void __user *uarg = (void __user *)arg; 1112ab4382d2SGreg Kroah-Hartman int ret = -ENOIOCTLCMD; 1113ab4382d2SGreg Kroah-Hartman 1114ab4382d2SGreg Kroah-Hartman 1115ab4382d2SGreg Kroah-Hartman /* 1116ab4382d2SGreg Kroah-Hartman * These ioctls don't rely on the hardware to be present. 1117ab4382d2SGreg Kroah-Hartman */ 1118ab4382d2SGreg Kroah-Hartman switch (cmd) { 1119ab4382d2SGreg Kroah-Hartman case TIOCGSERIAL: 1120ab4382d2SGreg Kroah-Hartman ret = uart_get_info(state, uarg); 1121ab4382d2SGreg Kroah-Hartman break; 1122ab4382d2SGreg Kroah-Hartman 1123ab4382d2SGreg Kroah-Hartman case TIOCSSERIAL: 1124ab4382d2SGreg Kroah-Hartman ret = uart_set_info(tty, state, uarg); 1125ab4382d2SGreg Kroah-Hartman break; 1126ab4382d2SGreg Kroah-Hartman 1127ab4382d2SGreg Kroah-Hartman case TIOCSERCONFIG: 1128ab4382d2SGreg Kroah-Hartman ret = uart_do_autoconfig(tty, state); 1129ab4382d2SGreg Kroah-Hartman break; 1130ab4382d2SGreg Kroah-Hartman 1131ab4382d2SGreg Kroah-Hartman case TIOCSERGWILD: /* obsolete */ 1132ab4382d2SGreg Kroah-Hartman case TIOCSERSWILD: /* obsolete */ 1133ab4382d2SGreg Kroah-Hartman ret = 0; 1134ab4382d2SGreg Kroah-Hartman break; 1135ab4382d2SGreg Kroah-Hartman } 1136ab4382d2SGreg Kroah-Hartman 1137ab4382d2SGreg Kroah-Hartman if (ret != -ENOIOCTLCMD) 1138ab4382d2SGreg Kroah-Hartman goto out; 1139ab4382d2SGreg Kroah-Hartman 1140ab4382d2SGreg Kroah-Hartman if (tty->flags & (1 << TTY_IO_ERROR)) { 1141ab4382d2SGreg Kroah-Hartman ret = -EIO; 1142ab4382d2SGreg Kroah-Hartman goto out; 1143ab4382d2SGreg Kroah-Hartman } 1144ab4382d2SGreg Kroah-Hartman 1145ab4382d2SGreg Kroah-Hartman /* 1146ab4382d2SGreg Kroah-Hartman * The following should only be used when hardware is present. 1147ab4382d2SGreg Kroah-Hartman */ 1148ab4382d2SGreg Kroah-Hartman switch (cmd) { 1149ab4382d2SGreg Kroah-Hartman case TIOCMIWAIT: 1150ab4382d2SGreg Kroah-Hartman ret = uart_wait_modem_status(state, arg); 1151ab4382d2SGreg Kroah-Hartman break; 1152ab4382d2SGreg Kroah-Hartman } 1153ab4382d2SGreg Kroah-Hartman 1154ab4382d2SGreg Kroah-Hartman if (ret != -ENOIOCTLCMD) 1155ab4382d2SGreg Kroah-Hartman goto out; 1156ab4382d2SGreg Kroah-Hartman 1157ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1158ab4382d2SGreg Kroah-Hartman 11596caa76b7SAlan Cox if (tty->flags & (1 << TTY_IO_ERROR)) { 1160ab4382d2SGreg Kroah-Hartman ret = -EIO; 1161ab4382d2SGreg Kroah-Hartman goto out_up; 1162ab4382d2SGreg Kroah-Hartman } 1163ab4382d2SGreg Kroah-Hartman 1164ab4382d2SGreg Kroah-Hartman /* 1165ab4382d2SGreg Kroah-Hartman * All these rely on hardware being present and need to be 1166ab4382d2SGreg Kroah-Hartman * protected against the tty being hung up. 1167ab4382d2SGreg Kroah-Hartman */ 1168ab4382d2SGreg Kroah-Hartman switch (cmd) { 1169ab4382d2SGreg Kroah-Hartman case TIOCSERGETLSR: /* Get line status register */ 1170ab4382d2SGreg Kroah-Hartman ret = uart_get_lsr_info(tty, state, uarg); 1171ab4382d2SGreg Kroah-Hartman break; 1172ab4382d2SGreg Kroah-Hartman 1173ab4382d2SGreg Kroah-Hartman default: { 1174ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1175ab4382d2SGreg Kroah-Hartman if (uport->ops->ioctl) 1176ab4382d2SGreg Kroah-Hartman ret = uport->ops->ioctl(uport, cmd, arg); 1177ab4382d2SGreg Kroah-Hartman break; 1178ab4382d2SGreg Kroah-Hartman } 1179ab4382d2SGreg Kroah-Hartman } 1180ab4382d2SGreg Kroah-Hartman out_up: 1181ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1182ab4382d2SGreg Kroah-Hartman out: 1183ab4382d2SGreg Kroah-Hartman return ret; 1184ab4382d2SGreg Kroah-Hartman } 1185ab4382d2SGreg Kroah-Hartman 1186ab4382d2SGreg Kroah-Hartman static void uart_set_ldisc(struct tty_struct *tty) 1187ab4382d2SGreg Kroah-Hartman { 1188ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1189ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1190ab4382d2SGreg Kroah-Hartman 1191ab4382d2SGreg Kroah-Hartman if (uport->ops->set_ldisc) 1192ab4382d2SGreg Kroah-Hartman uport->ops->set_ldisc(uport, tty->termios->c_line); 1193ab4382d2SGreg Kroah-Hartman } 1194ab4382d2SGreg Kroah-Hartman 1195ab4382d2SGreg Kroah-Hartman static void uart_set_termios(struct tty_struct *tty, 1196ab4382d2SGreg Kroah-Hartman struct ktermios *old_termios) 1197ab4382d2SGreg Kroah-Hartman { 1198ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1199ab4382d2SGreg Kroah-Hartman unsigned long flags; 1200ab4382d2SGreg Kroah-Hartman unsigned int cflag = tty->termios->c_cflag; 1201ab4382d2SGreg Kroah-Hartman 1202ab4382d2SGreg Kroah-Hartman 1203ab4382d2SGreg Kroah-Hartman /* 1204ab4382d2SGreg Kroah-Hartman * These are the bits that are used to setup various 1205ab4382d2SGreg Kroah-Hartman * flags in the low level driver. We can ignore the Bfoo 1206ab4382d2SGreg Kroah-Hartman * bits in c_cflag; c_[io]speed will always be set 1207ab4382d2SGreg Kroah-Hartman * appropriately by set_termios() in tty_ioctl.c 1208ab4382d2SGreg Kroah-Hartman */ 1209ab4382d2SGreg Kroah-Hartman #define RELEVANT_IFLAG(iflag) ((iflag) & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK)) 1210ab4382d2SGreg Kroah-Hartman if ((cflag ^ old_termios->c_cflag) == 0 && 1211ab4382d2SGreg Kroah-Hartman tty->termios->c_ospeed == old_termios->c_ospeed && 1212ab4382d2SGreg Kroah-Hartman tty->termios->c_ispeed == old_termios->c_ispeed && 1213ab4382d2SGreg Kroah-Hartman RELEVANT_IFLAG(tty->termios->c_iflag ^ old_termios->c_iflag) == 0) { 1214ab4382d2SGreg Kroah-Hartman return; 1215ab4382d2SGreg Kroah-Hartman } 1216ab4382d2SGreg Kroah-Hartman 1217ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, old_termios); 1218ab4382d2SGreg Kroah-Hartman 1219ab4382d2SGreg Kroah-Hartman /* Handle transition to B0 status */ 1220ab4382d2SGreg Kroah-Hartman if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) 1221ab4382d2SGreg Kroah-Hartman uart_clear_mctrl(state->uart_port, TIOCM_RTS | TIOCM_DTR); 1222ab4382d2SGreg Kroah-Hartman /* Handle transition away from B0 status */ 1223ab4382d2SGreg Kroah-Hartman else if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { 1224ab4382d2SGreg Kroah-Hartman unsigned int mask = TIOCM_DTR; 1225ab4382d2SGreg Kroah-Hartman if (!(cflag & CRTSCTS) || 1226ab4382d2SGreg Kroah-Hartman !test_bit(TTY_THROTTLED, &tty->flags)) 1227ab4382d2SGreg Kroah-Hartman mask |= TIOCM_RTS; 1228ab4382d2SGreg Kroah-Hartman uart_set_mctrl(state->uart_port, mask); 1229ab4382d2SGreg Kroah-Hartman } 1230ab4382d2SGreg Kroah-Hartman 1231ab4382d2SGreg Kroah-Hartman /* Handle turning off CRTSCTS */ 1232ab4382d2SGreg Kroah-Hartman if ((old_termios->c_cflag & CRTSCTS) && !(cflag & CRTSCTS)) { 1233ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&state->uart_port->lock, flags); 1234ab4382d2SGreg Kroah-Hartman tty->hw_stopped = 0; 1235ab4382d2SGreg Kroah-Hartman __uart_start(tty); 1236ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&state->uart_port->lock, flags); 1237ab4382d2SGreg Kroah-Hartman } 1238ab4382d2SGreg Kroah-Hartman /* Handle turning on CRTSCTS */ 1239ab4382d2SGreg Kroah-Hartman else if (!(old_termios->c_cflag & CRTSCTS) && (cflag & CRTSCTS)) { 1240ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&state->uart_port->lock, flags); 1241ab4382d2SGreg Kroah-Hartman if (!(state->uart_port->ops->get_mctrl(state->uart_port) & TIOCM_CTS)) { 1242ab4382d2SGreg Kroah-Hartman tty->hw_stopped = 1; 1243ab4382d2SGreg Kroah-Hartman state->uart_port->ops->stop_tx(state->uart_port); 1244ab4382d2SGreg Kroah-Hartman } 1245ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&state->uart_port->lock, flags); 1246ab4382d2SGreg Kroah-Hartman } 1247ab4382d2SGreg Kroah-Hartman } 1248ab4382d2SGreg Kroah-Hartman 1249ab4382d2SGreg Kroah-Hartman /* 1250ab4382d2SGreg Kroah-Hartman * In 2.4.5, calls to this will be serialized via the BKL in 1251ab4382d2SGreg Kroah-Hartman * linux/drivers/char/tty_io.c:tty_release() 1252ab4382d2SGreg Kroah-Hartman * linux/drivers/char/tty_io.c:do_tty_handup() 1253ab4382d2SGreg Kroah-Hartman */ 1254ab4382d2SGreg Kroah-Hartman static void uart_close(struct tty_struct *tty, struct file *filp) 1255ab4382d2SGreg Kroah-Hartman { 1256ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1257ab4382d2SGreg Kroah-Hartman struct tty_port *port; 1258ab4382d2SGreg Kroah-Hartman struct uart_port *uport; 1259ab4382d2SGreg Kroah-Hartman unsigned long flags; 1260ab4382d2SGreg Kroah-Hartman 1261ab4382d2SGreg Kroah-Hartman if (!state) 1262ab4382d2SGreg Kroah-Hartman return; 1263ab4382d2SGreg Kroah-Hartman 1264ab4382d2SGreg Kroah-Hartman uport = state->uart_port; 1265ab4382d2SGreg Kroah-Hartman port = &state->port; 1266ab4382d2SGreg Kroah-Hartman 1267ab4382d2SGreg Kroah-Hartman pr_debug("uart_close(%d) called\n", uport->line); 1268ab4382d2SGreg Kroah-Hartman 1269d30ccf08SJiri Slaby if (tty_port_close_start(port, tty, filp) == 0) 127055956216SNobuhiro Iwamatsu return; 1271ab4382d2SGreg Kroah-Hartman 1272ab4382d2SGreg Kroah-Hartman /* 1273ab4382d2SGreg Kroah-Hartman * At this point, we stop accepting input. To do this, we 1274ab4382d2SGreg Kroah-Hartman * disable the receive line status interrupts. 1275ab4382d2SGreg Kroah-Hartman */ 1276ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_INITIALIZED) { 1277ab4382d2SGreg Kroah-Hartman unsigned long flags; 1278ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&uport->lock, flags); 1279ab4382d2SGreg Kroah-Hartman uport->ops->stop_rx(uport); 1280ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&uport->lock, flags); 1281ab4382d2SGreg Kroah-Hartman /* 1282ab4382d2SGreg Kroah-Hartman * Before we drop DTR, make sure the UART transmitter 1283ab4382d2SGreg Kroah-Hartman * has completely drained; this is especially 1284ab4382d2SGreg Kroah-Hartman * important if there is a transmit FIFO! 1285ab4382d2SGreg Kroah-Hartman */ 12861f33a51dSJiri Slaby uart_wait_until_sent(tty, uport->timeout); 1287ab4382d2SGreg Kroah-Hartman } 1288ab4382d2SGreg Kroah-Hartman 1289bafb0bd2SJiri Slaby mutex_lock(&port->mutex); 1290ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 1291ab4382d2SGreg Kroah-Hartman uart_flush_buffer(tty); 1292ab4382d2SGreg Kroah-Hartman 1293ab4382d2SGreg Kroah-Hartman tty_ldisc_flush(tty); 1294ab4382d2SGreg Kroah-Hartman 1295ab4382d2SGreg Kroah-Hartman tty_port_tty_set(port, NULL); 1296ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 1297ab4382d2SGreg Kroah-Hartman tty->closing = 0; 1298ab4382d2SGreg Kroah-Hartman 1299ab4382d2SGreg Kroah-Hartman if (port->blocked_open) { 1300ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 1301ab4382d2SGreg Kroah-Hartman if (port->close_delay) 13024cb0fbfdSJiri Slaby msleep_interruptible( 13034cb0fbfdSJiri Slaby jiffies_to_msecs(port->close_delay)); 1304ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 1305ab4382d2SGreg Kroah-Hartman } else if (!uart_console(uport)) { 1306ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 1307ab4382d2SGreg Kroah-Hartman uart_change_pm(state, 3); 1308ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 1309ab4382d2SGreg Kroah-Hartman } 1310ab4382d2SGreg Kroah-Hartman 1311ab4382d2SGreg Kroah-Hartman /* 1312ab4382d2SGreg Kroah-Hartman * Wake up anyone trying to open this port. 1313ab4382d2SGreg Kroah-Hartman */ 1314ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); 1315426929f8SJiri Slaby clear_bit(ASYNCB_CLOSING, &port->flags); 1316ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 1317ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->open_wait); 1318426929f8SJiri Slaby wake_up_interruptible(&port->close_wait); 1319ab4382d2SGreg Kroah-Hartman 1320ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1321ab4382d2SGreg Kroah-Hartman } 1322ab4382d2SGreg Kroah-Hartman 13231f33a51dSJiri Slaby static void uart_wait_until_sent(struct tty_struct *tty, int timeout) 1324ab4382d2SGreg Kroah-Hartman { 13251f33a51dSJiri Slaby struct uart_state *state = tty->driver_data; 13261f33a51dSJiri Slaby struct uart_port *port = state->uart_port; 1327ab4382d2SGreg Kroah-Hartman unsigned long char_time, expire; 1328ab4382d2SGreg Kroah-Hartman 1329ab4382d2SGreg Kroah-Hartman if (port->type == PORT_UNKNOWN || port->fifosize == 0) 1330ab4382d2SGreg Kroah-Hartman return; 1331ab4382d2SGreg Kroah-Hartman 1332ab4382d2SGreg Kroah-Hartman /* 1333ab4382d2SGreg Kroah-Hartman * Set the check interval to be 1/5 of the estimated time to 1334ab4382d2SGreg Kroah-Hartman * send a single character, and make it at least 1. The check 1335ab4382d2SGreg Kroah-Hartman * interval should also be less than the timeout. 1336ab4382d2SGreg Kroah-Hartman * 1337ab4382d2SGreg Kroah-Hartman * Note: we have to use pretty tight timings here to satisfy 1338ab4382d2SGreg Kroah-Hartman * the NIST-PCTS. 1339ab4382d2SGreg Kroah-Hartman */ 1340ab4382d2SGreg Kroah-Hartman char_time = (port->timeout - HZ/50) / port->fifosize; 1341ab4382d2SGreg Kroah-Hartman char_time = char_time / 5; 1342ab4382d2SGreg Kroah-Hartman if (char_time == 0) 1343ab4382d2SGreg Kroah-Hartman char_time = 1; 1344ab4382d2SGreg Kroah-Hartman if (timeout && timeout < char_time) 1345ab4382d2SGreg Kroah-Hartman char_time = timeout; 1346ab4382d2SGreg Kroah-Hartman 1347ab4382d2SGreg Kroah-Hartman /* 1348ab4382d2SGreg Kroah-Hartman * If the transmitter hasn't cleared in twice the approximate 1349ab4382d2SGreg Kroah-Hartman * amount of time to send the entire FIFO, it probably won't 1350ab4382d2SGreg Kroah-Hartman * ever clear. This assumes the UART isn't doing flow 1351ab4382d2SGreg Kroah-Hartman * control, which is currently the case. Hence, if it ever 1352ab4382d2SGreg Kroah-Hartman * takes longer than port->timeout, this is probably due to a 1353ab4382d2SGreg Kroah-Hartman * UART bug of some kind. So, we clamp the timeout parameter at 1354ab4382d2SGreg Kroah-Hartman * 2*port->timeout. 1355ab4382d2SGreg Kroah-Hartman */ 1356ab4382d2SGreg Kroah-Hartman if (timeout == 0 || timeout > 2 * port->timeout) 1357ab4382d2SGreg Kroah-Hartman timeout = 2 * port->timeout; 1358ab4382d2SGreg Kroah-Hartman 1359ab4382d2SGreg Kroah-Hartman expire = jiffies + timeout; 1360ab4382d2SGreg Kroah-Hartman 1361ab4382d2SGreg Kroah-Hartman pr_debug("uart_wait_until_sent(%d), jiffies=%lu, expire=%lu...\n", 1362ab4382d2SGreg Kroah-Hartman port->line, jiffies, expire); 1363ab4382d2SGreg Kroah-Hartman 1364ab4382d2SGreg Kroah-Hartman /* 1365ab4382d2SGreg Kroah-Hartman * Check whether the transmitter is empty every 'char_time'. 1366ab4382d2SGreg Kroah-Hartman * 'timeout' / 'expire' give us the maximum amount of time 1367ab4382d2SGreg Kroah-Hartman * we wait. 1368ab4382d2SGreg Kroah-Hartman */ 1369ab4382d2SGreg Kroah-Hartman while (!port->ops->tx_empty(port)) { 1370ab4382d2SGreg Kroah-Hartman msleep_interruptible(jiffies_to_msecs(char_time)); 1371ab4382d2SGreg Kroah-Hartman if (signal_pending(current)) 1372ab4382d2SGreg Kroah-Hartman break; 1373ab4382d2SGreg Kroah-Hartman if (time_after(jiffies, expire)) 1374ab4382d2SGreg Kroah-Hartman break; 1375ab4382d2SGreg Kroah-Hartman } 1376ab4382d2SGreg Kroah-Hartman } 1377ab4382d2SGreg Kroah-Hartman 1378ab4382d2SGreg Kroah-Hartman /* 1379ab4382d2SGreg Kroah-Hartman * This is called with the BKL held in 1380ab4382d2SGreg Kroah-Hartman * linux/drivers/char/tty_io.c:do_tty_hangup() 1381ab4382d2SGreg Kroah-Hartman * We're called from the eventd thread, so we can sleep for 1382ab4382d2SGreg Kroah-Hartman * a _short_ time only. 1383ab4382d2SGreg Kroah-Hartman */ 1384ab4382d2SGreg Kroah-Hartman static void uart_hangup(struct tty_struct *tty) 1385ab4382d2SGreg Kroah-Hartman { 1386ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1387ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1388ab4382d2SGreg Kroah-Hartman unsigned long flags; 1389ab4382d2SGreg Kroah-Hartman 1390ab4382d2SGreg Kroah-Hartman pr_debug("uart_hangup(%d)\n", state->uart_port->line); 1391ab4382d2SGreg Kroah-Hartman 1392ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1393ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_NORMAL_ACTIVE) { 1394ab4382d2SGreg Kroah-Hartman uart_flush_buffer(tty); 1395ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 1396ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 1397ab4382d2SGreg Kroah-Hartman port->count = 0; 1398ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); 1399ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 1400ab4382d2SGreg Kroah-Hartman tty_port_tty_set(port, NULL); 1401ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->open_wait); 1402ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->delta_msr_wait); 1403ab4382d2SGreg Kroah-Hartman } 1404ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1405ab4382d2SGreg Kroah-Hartman } 1406ab4382d2SGreg Kroah-Hartman 1407ab4382d2SGreg Kroah-Hartman static int uart_carrier_raised(struct tty_port *port) 1408ab4382d2SGreg Kroah-Hartman { 1409ab4382d2SGreg Kroah-Hartman struct uart_state *state = container_of(port, struct uart_state, port); 1410ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1411ab4382d2SGreg Kroah-Hartman int mctrl; 1412ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1413ab4382d2SGreg Kroah-Hartman uport->ops->enable_ms(uport); 1414ab4382d2SGreg Kroah-Hartman mctrl = uport->ops->get_mctrl(uport); 1415ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1416ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_CAR) 1417ab4382d2SGreg Kroah-Hartman return 1; 1418ab4382d2SGreg Kroah-Hartman return 0; 1419ab4382d2SGreg Kroah-Hartman } 1420ab4382d2SGreg Kroah-Hartman 1421ab4382d2SGreg Kroah-Hartman static void uart_dtr_rts(struct tty_port *port, int onoff) 1422ab4382d2SGreg Kroah-Hartman { 1423ab4382d2SGreg Kroah-Hartman struct uart_state *state = container_of(port, struct uart_state, port); 1424ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1425ab4382d2SGreg Kroah-Hartman 14266f5c24adSJiri Slaby if (onoff) 1427ab4382d2SGreg Kroah-Hartman uart_set_mctrl(uport, TIOCM_DTR | TIOCM_RTS); 1428ab4382d2SGreg Kroah-Hartman else 1429ab4382d2SGreg Kroah-Hartman uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); 1430ab4382d2SGreg Kroah-Hartman } 1431ab4382d2SGreg Kroah-Hartman 1432ab4382d2SGreg Kroah-Hartman /* 1433ab4382d2SGreg Kroah-Hartman * calls to uart_open are serialised by the BKL in 1434ab4382d2SGreg Kroah-Hartman * fs/char_dev.c:chrdev_open() 1435ab4382d2SGreg Kroah-Hartman * Note that if this fails, then uart_close() _will_ be called. 1436ab4382d2SGreg Kroah-Hartman * 1437ab4382d2SGreg Kroah-Hartman * In time, we want to scrap the "opening nonpresent ports" 1438ab4382d2SGreg Kroah-Hartman * behaviour and implement an alternative way for setserial 1439ab4382d2SGreg Kroah-Hartman * to set base addresses/ports/types. This will allow us to 1440ab4382d2SGreg Kroah-Hartman * get rid of a certain amount of extra tests. 1441ab4382d2SGreg Kroah-Hartman */ 1442ab4382d2SGreg Kroah-Hartman static int uart_open(struct tty_struct *tty, struct file *filp) 1443ab4382d2SGreg Kroah-Hartman { 1444ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = (struct uart_driver *)tty->driver->driver_state; 1445ab4382d2SGreg Kroah-Hartman int retval, line = tty->index; 14461c7b13c4SJiri Slaby struct uart_state *state = drv->state + line; 14471c7b13c4SJiri Slaby struct tty_port *port = &state->port; 1448ab4382d2SGreg Kroah-Hartman 1449ab4382d2SGreg Kroah-Hartman pr_debug("uart_open(%d) called\n", line); 1450ab4382d2SGreg Kroah-Hartman 1451ab4382d2SGreg Kroah-Hartman /* 14521c7b13c4SJiri Slaby * We take the semaphore here to guarantee that we won't be re-entered 14531c7b13c4SJiri Slaby * while allocating the state structure, or while we request any IRQs 14541c7b13c4SJiri Slaby * that the driver may need. This also has the nice side-effect that 14551c7b13c4SJiri Slaby * it delays the action of uart_hangup, so we can guarantee that 14561c7b13c4SJiri Slaby * state->port.tty will always contain something reasonable. 1457ab4382d2SGreg Kroah-Hartman */ 14581c7b13c4SJiri Slaby if (mutex_lock_interruptible(&port->mutex)) { 14591c7b13c4SJiri Slaby retval = -ERESTARTSYS; 14601c7b13c4SJiri Slaby goto end; 1461ab4382d2SGreg Kroah-Hartman } 14621c7b13c4SJiri Slaby 14631c7b13c4SJiri Slaby port->count++; 14641c7b13c4SJiri Slaby if (!state->uart_port || state->uart_port->flags & UPF_DEAD) { 14651c7b13c4SJiri Slaby retval = -ENXIO; 14661c7b13c4SJiri Slaby goto err_dec_count; 14671c7b13c4SJiri Slaby } 1468ab4382d2SGreg Kroah-Hartman 1469ab4382d2SGreg Kroah-Hartman /* 1470ab4382d2SGreg Kroah-Hartman * Once we set tty->driver_data here, we are guaranteed that 1471ab4382d2SGreg Kroah-Hartman * uart_close() will decrement the driver module use count. 1472ab4382d2SGreg Kroah-Hartman * Any failures from here onwards should not touch the count. 1473ab4382d2SGreg Kroah-Hartman */ 1474ab4382d2SGreg Kroah-Hartman tty->driver_data = state; 1475ab4382d2SGreg Kroah-Hartman state->uart_port->state = state; 1476ab4382d2SGreg Kroah-Hartman tty->low_latency = (state->uart_port->flags & UPF_LOW_LATENCY) ? 1 : 0; 1477ab4382d2SGreg Kroah-Hartman tty_port_tty_set(port, tty); 1478ab4382d2SGreg Kroah-Hartman 1479ab4382d2SGreg Kroah-Hartman /* 1480ab4382d2SGreg Kroah-Hartman * If the port is in the middle of closing, bail out now. 1481ab4382d2SGreg Kroah-Hartman */ 1482ab4382d2SGreg Kroah-Hartman if (tty_hung_up_p(filp)) { 1483ab4382d2SGreg Kroah-Hartman retval = -EAGAIN; 14841c7b13c4SJiri Slaby goto err_dec_count; 1485ab4382d2SGreg Kroah-Hartman } 1486ab4382d2SGreg Kroah-Hartman 1487ab4382d2SGreg Kroah-Hartman /* 1488ab4382d2SGreg Kroah-Hartman * Make sure the device is in D0 state. 1489ab4382d2SGreg Kroah-Hartman */ 1490ab4382d2SGreg Kroah-Hartman if (port->count == 1) 1491ab4382d2SGreg Kroah-Hartman uart_change_pm(state, 0); 1492ab4382d2SGreg Kroah-Hartman 1493ab4382d2SGreg Kroah-Hartman /* 1494ab4382d2SGreg Kroah-Hartman * Start up the serial port. 1495ab4382d2SGreg Kroah-Hartman */ 1496ab4382d2SGreg Kroah-Hartman retval = uart_startup(tty, state, 0); 1497ab4382d2SGreg Kroah-Hartman 1498ab4382d2SGreg Kroah-Hartman /* 1499ab4382d2SGreg Kroah-Hartman * If we succeeded, wait until the port is ready. 1500ab4382d2SGreg Kroah-Hartman */ 1501ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1502ab4382d2SGreg Kroah-Hartman if (retval == 0) 1503ab4382d2SGreg Kroah-Hartman retval = tty_port_block_til_ready(port, tty, filp); 1504ab4382d2SGreg Kroah-Hartman 15051c7b13c4SJiri Slaby end: 1506ab4382d2SGreg Kroah-Hartman return retval; 15071c7b13c4SJiri Slaby err_dec_count: 15081c7b13c4SJiri Slaby port->count--; 15091c7b13c4SJiri Slaby mutex_unlock(&port->mutex); 15101c7b13c4SJiri Slaby goto end; 1511ab4382d2SGreg Kroah-Hartman } 1512ab4382d2SGreg Kroah-Hartman 1513ab4382d2SGreg Kroah-Hartman static const char *uart_type(struct uart_port *port) 1514ab4382d2SGreg Kroah-Hartman { 1515ab4382d2SGreg Kroah-Hartman const char *str = NULL; 1516ab4382d2SGreg Kroah-Hartman 1517ab4382d2SGreg Kroah-Hartman if (port->ops->type) 1518ab4382d2SGreg Kroah-Hartman str = port->ops->type(port); 1519ab4382d2SGreg Kroah-Hartman 1520ab4382d2SGreg Kroah-Hartman if (!str) 1521ab4382d2SGreg Kroah-Hartman str = "unknown"; 1522ab4382d2SGreg Kroah-Hartman 1523ab4382d2SGreg Kroah-Hartman return str; 1524ab4382d2SGreg Kroah-Hartman } 1525ab4382d2SGreg Kroah-Hartman 1526ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_PROC_FS 1527ab4382d2SGreg Kroah-Hartman 1528ab4382d2SGreg Kroah-Hartman static void uart_line_info(struct seq_file *m, struct uart_driver *drv, int i) 1529ab4382d2SGreg Kroah-Hartman { 1530ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + i; 1531ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1532ab4382d2SGreg Kroah-Hartman int pm_state; 1533ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1534ab4382d2SGreg Kroah-Hartman char stat_buf[32]; 1535ab4382d2SGreg Kroah-Hartman unsigned int status; 1536ab4382d2SGreg Kroah-Hartman int mmio; 1537ab4382d2SGreg Kroah-Hartman 1538ab4382d2SGreg Kroah-Hartman if (!uport) 1539ab4382d2SGreg Kroah-Hartman return; 1540ab4382d2SGreg Kroah-Hartman 1541ab4382d2SGreg Kroah-Hartman mmio = uport->iotype >= UPIO_MEM; 1542ab4382d2SGreg Kroah-Hartman seq_printf(m, "%d: uart:%s %s%08llX irq:%d", 1543ab4382d2SGreg Kroah-Hartman uport->line, uart_type(uport), 1544ab4382d2SGreg Kroah-Hartman mmio ? "mmio:0x" : "port:", 1545ab4382d2SGreg Kroah-Hartman mmio ? (unsigned long long)uport->mapbase 1546ab4382d2SGreg Kroah-Hartman : (unsigned long long)uport->iobase, 1547ab4382d2SGreg Kroah-Hartman uport->irq); 1548ab4382d2SGreg Kroah-Hartman 1549ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) { 1550ab4382d2SGreg Kroah-Hartman seq_putc(m, '\n'); 1551ab4382d2SGreg Kroah-Hartman return; 1552ab4382d2SGreg Kroah-Hartman } 1553ab4382d2SGreg Kroah-Hartman 1554ab4382d2SGreg Kroah-Hartman if (capable(CAP_SYS_ADMIN)) { 1555ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1556ab4382d2SGreg Kroah-Hartman pm_state = state->pm_state; 1557ab4382d2SGreg Kroah-Hartman if (pm_state) 1558ab4382d2SGreg Kroah-Hartman uart_change_pm(state, 0); 1559ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1560ab4382d2SGreg Kroah-Hartman status = uport->ops->get_mctrl(uport); 1561ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1562ab4382d2SGreg Kroah-Hartman if (pm_state) 1563ab4382d2SGreg Kroah-Hartman uart_change_pm(state, pm_state); 1564ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1565ab4382d2SGreg Kroah-Hartman 1566ab4382d2SGreg Kroah-Hartman seq_printf(m, " tx:%d rx:%d", 1567ab4382d2SGreg Kroah-Hartman uport->icount.tx, uport->icount.rx); 1568ab4382d2SGreg Kroah-Hartman if (uport->icount.frame) 1569ab4382d2SGreg Kroah-Hartman seq_printf(m, " fe:%d", 1570ab4382d2SGreg Kroah-Hartman uport->icount.frame); 1571ab4382d2SGreg Kroah-Hartman if (uport->icount.parity) 1572ab4382d2SGreg Kroah-Hartman seq_printf(m, " pe:%d", 1573ab4382d2SGreg Kroah-Hartman uport->icount.parity); 1574ab4382d2SGreg Kroah-Hartman if (uport->icount.brk) 1575ab4382d2SGreg Kroah-Hartman seq_printf(m, " brk:%d", 1576ab4382d2SGreg Kroah-Hartman uport->icount.brk); 1577ab4382d2SGreg Kroah-Hartman if (uport->icount.overrun) 1578ab4382d2SGreg Kroah-Hartman seq_printf(m, " oe:%d", 1579ab4382d2SGreg Kroah-Hartman uport->icount.overrun); 1580ab4382d2SGreg Kroah-Hartman 1581ab4382d2SGreg Kroah-Hartman #define INFOBIT(bit, str) \ 1582ab4382d2SGreg Kroah-Hartman if (uport->mctrl & (bit)) \ 1583ab4382d2SGreg Kroah-Hartman strncat(stat_buf, (str), sizeof(stat_buf) - \ 1584ab4382d2SGreg Kroah-Hartman strlen(stat_buf) - 2) 1585ab4382d2SGreg Kroah-Hartman #define STATBIT(bit, str) \ 1586ab4382d2SGreg Kroah-Hartman if (status & (bit)) \ 1587ab4382d2SGreg Kroah-Hartman strncat(stat_buf, (str), sizeof(stat_buf) - \ 1588ab4382d2SGreg Kroah-Hartman strlen(stat_buf) - 2) 1589ab4382d2SGreg Kroah-Hartman 1590ab4382d2SGreg Kroah-Hartman stat_buf[0] = '\0'; 1591ab4382d2SGreg Kroah-Hartman stat_buf[1] = '\0'; 1592ab4382d2SGreg Kroah-Hartman INFOBIT(TIOCM_RTS, "|RTS"); 1593ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_CTS, "|CTS"); 1594ab4382d2SGreg Kroah-Hartman INFOBIT(TIOCM_DTR, "|DTR"); 1595ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_DSR, "|DSR"); 1596ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_CAR, "|CD"); 1597ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_RNG, "|RI"); 1598ab4382d2SGreg Kroah-Hartman if (stat_buf[0]) 1599ab4382d2SGreg Kroah-Hartman stat_buf[0] = ' '; 1600ab4382d2SGreg Kroah-Hartman 1601ab4382d2SGreg Kroah-Hartman seq_puts(m, stat_buf); 1602ab4382d2SGreg Kroah-Hartman } 1603ab4382d2SGreg Kroah-Hartman seq_putc(m, '\n'); 1604ab4382d2SGreg Kroah-Hartman #undef STATBIT 1605ab4382d2SGreg Kroah-Hartman #undef INFOBIT 1606ab4382d2SGreg Kroah-Hartman } 1607ab4382d2SGreg Kroah-Hartman 1608ab4382d2SGreg Kroah-Hartman static int uart_proc_show(struct seq_file *m, void *v) 1609ab4382d2SGreg Kroah-Hartman { 1610ab4382d2SGreg Kroah-Hartman struct tty_driver *ttydrv = m->private; 1611ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = ttydrv->driver_state; 1612ab4382d2SGreg Kroah-Hartman int i; 1613ab4382d2SGreg Kroah-Hartman 1614ab4382d2SGreg Kroah-Hartman seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n", 1615ab4382d2SGreg Kroah-Hartman "", "", ""); 1616ab4382d2SGreg Kroah-Hartman for (i = 0; i < drv->nr; i++) 1617ab4382d2SGreg Kroah-Hartman uart_line_info(m, drv, i); 1618ab4382d2SGreg Kroah-Hartman return 0; 1619ab4382d2SGreg Kroah-Hartman } 1620ab4382d2SGreg Kroah-Hartman 1621ab4382d2SGreg Kroah-Hartman static int uart_proc_open(struct inode *inode, struct file *file) 1622ab4382d2SGreg Kroah-Hartman { 1623ab4382d2SGreg Kroah-Hartman return single_open(file, uart_proc_show, PDE(inode)->data); 1624ab4382d2SGreg Kroah-Hartman } 1625ab4382d2SGreg Kroah-Hartman 1626ab4382d2SGreg Kroah-Hartman static const struct file_operations uart_proc_fops = { 1627ab4382d2SGreg Kroah-Hartman .owner = THIS_MODULE, 1628ab4382d2SGreg Kroah-Hartman .open = uart_proc_open, 1629ab4382d2SGreg Kroah-Hartman .read = seq_read, 1630ab4382d2SGreg Kroah-Hartman .llseek = seq_lseek, 1631ab4382d2SGreg Kroah-Hartman .release = single_release, 1632ab4382d2SGreg Kroah-Hartman }; 1633ab4382d2SGreg Kroah-Hartman #endif 1634ab4382d2SGreg Kroah-Hartman 1635ab4382d2SGreg Kroah-Hartman #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL) 1636ab4382d2SGreg Kroah-Hartman /* 1637ab4382d2SGreg Kroah-Hartman * uart_console_write - write a console message to a serial port 1638ab4382d2SGreg Kroah-Hartman * @port: the port to write the message 1639ab4382d2SGreg Kroah-Hartman * @s: array of characters 1640ab4382d2SGreg Kroah-Hartman * @count: number of characters in string to write 1641ab4382d2SGreg Kroah-Hartman * @write: function to write character to port 1642ab4382d2SGreg Kroah-Hartman */ 1643ab4382d2SGreg Kroah-Hartman void uart_console_write(struct uart_port *port, const char *s, 1644ab4382d2SGreg Kroah-Hartman unsigned int count, 1645ab4382d2SGreg Kroah-Hartman void (*putchar)(struct uart_port *, int)) 1646ab4382d2SGreg Kroah-Hartman { 1647ab4382d2SGreg Kroah-Hartman unsigned int i; 1648ab4382d2SGreg Kroah-Hartman 1649ab4382d2SGreg Kroah-Hartman for (i = 0; i < count; i++, s++) { 1650ab4382d2SGreg Kroah-Hartman if (*s == '\n') 1651ab4382d2SGreg Kroah-Hartman putchar(port, '\r'); 1652ab4382d2SGreg Kroah-Hartman putchar(port, *s); 1653ab4382d2SGreg Kroah-Hartman } 1654ab4382d2SGreg Kroah-Hartman } 1655ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_console_write); 1656ab4382d2SGreg Kroah-Hartman 1657ab4382d2SGreg Kroah-Hartman /* 1658ab4382d2SGreg Kroah-Hartman * Check whether an invalid uart number has been specified, and 1659ab4382d2SGreg Kroah-Hartman * if so, search for the first available port that does have 1660ab4382d2SGreg Kroah-Hartman * console support. 1661ab4382d2SGreg Kroah-Hartman */ 1662ab4382d2SGreg Kroah-Hartman struct uart_port * __init 1663ab4382d2SGreg Kroah-Hartman uart_get_console(struct uart_port *ports, int nr, struct console *co) 1664ab4382d2SGreg Kroah-Hartman { 1665ab4382d2SGreg Kroah-Hartman int idx = co->index; 1666ab4382d2SGreg Kroah-Hartman 1667ab4382d2SGreg Kroah-Hartman if (idx < 0 || idx >= nr || (ports[idx].iobase == 0 && 1668ab4382d2SGreg Kroah-Hartman ports[idx].membase == NULL)) 1669ab4382d2SGreg Kroah-Hartman for (idx = 0; idx < nr; idx++) 1670ab4382d2SGreg Kroah-Hartman if (ports[idx].iobase != 0 || 1671ab4382d2SGreg Kroah-Hartman ports[idx].membase != NULL) 1672ab4382d2SGreg Kroah-Hartman break; 1673ab4382d2SGreg Kroah-Hartman 1674ab4382d2SGreg Kroah-Hartman co->index = idx; 1675ab4382d2SGreg Kroah-Hartman 1676ab4382d2SGreg Kroah-Hartman return ports + idx; 1677ab4382d2SGreg Kroah-Hartman } 1678ab4382d2SGreg Kroah-Hartman 1679ab4382d2SGreg Kroah-Hartman /** 1680ab4382d2SGreg Kroah-Hartman * uart_parse_options - Parse serial port baud/parity/bits/flow contro. 1681ab4382d2SGreg Kroah-Hartman * @options: pointer to option string 1682ab4382d2SGreg Kroah-Hartman * @baud: pointer to an 'int' variable for the baud rate. 1683ab4382d2SGreg Kroah-Hartman * @parity: pointer to an 'int' variable for the parity. 1684ab4382d2SGreg Kroah-Hartman * @bits: pointer to an 'int' variable for the number of data bits. 1685ab4382d2SGreg Kroah-Hartman * @flow: pointer to an 'int' variable for the flow control character. 1686ab4382d2SGreg Kroah-Hartman * 1687ab4382d2SGreg Kroah-Hartman * uart_parse_options decodes a string containing the serial console 1688ab4382d2SGreg Kroah-Hartman * options. The format of the string is <baud><parity><bits><flow>, 1689ab4382d2SGreg Kroah-Hartman * eg: 115200n8r 1690ab4382d2SGreg Kroah-Hartman */ 1691ab4382d2SGreg Kroah-Hartman void 1692ab4382d2SGreg Kroah-Hartman uart_parse_options(char *options, int *baud, int *parity, int *bits, int *flow) 1693ab4382d2SGreg Kroah-Hartman { 1694ab4382d2SGreg Kroah-Hartman char *s = options; 1695ab4382d2SGreg Kroah-Hartman 1696ab4382d2SGreg Kroah-Hartman *baud = simple_strtoul(s, NULL, 10); 1697ab4382d2SGreg Kroah-Hartman while (*s >= '0' && *s <= '9') 1698ab4382d2SGreg Kroah-Hartman s++; 1699ab4382d2SGreg Kroah-Hartman if (*s) 1700ab4382d2SGreg Kroah-Hartman *parity = *s++; 1701ab4382d2SGreg Kroah-Hartman if (*s) 1702ab4382d2SGreg Kroah-Hartman *bits = *s++ - '0'; 1703ab4382d2SGreg Kroah-Hartman if (*s) 1704ab4382d2SGreg Kroah-Hartman *flow = *s; 1705ab4382d2SGreg Kroah-Hartman } 1706ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_parse_options); 1707ab4382d2SGreg Kroah-Hartman 1708ab4382d2SGreg Kroah-Hartman struct baud_rates { 1709ab4382d2SGreg Kroah-Hartman unsigned int rate; 1710ab4382d2SGreg Kroah-Hartman unsigned int cflag; 1711ab4382d2SGreg Kroah-Hartman }; 1712ab4382d2SGreg Kroah-Hartman 1713ab4382d2SGreg Kroah-Hartman static const struct baud_rates baud_rates[] = { 1714ab4382d2SGreg Kroah-Hartman { 921600, B921600 }, 1715ab4382d2SGreg Kroah-Hartman { 460800, B460800 }, 1716ab4382d2SGreg Kroah-Hartman { 230400, B230400 }, 1717ab4382d2SGreg Kroah-Hartman { 115200, B115200 }, 1718ab4382d2SGreg Kroah-Hartman { 57600, B57600 }, 1719ab4382d2SGreg Kroah-Hartman { 38400, B38400 }, 1720ab4382d2SGreg Kroah-Hartman { 19200, B19200 }, 1721ab4382d2SGreg Kroah-Hartman { 9600, B9600 }, 1722ab4382d2SGreg Kroah-Hartman { 4800, B4800 }, 1723ab4382d2SGreg Kroah-Hartman { 2400, B2400 }, 1724ab4382d2SGreg Kroah-Hartman { 1200, B1200 }, 1725ab4382d2SGreg Kroah-Hartman { 0, B38400 } 1726ab4382d2SGreg Kroah-Hartman }; 1727ab4382d2SGreg Kroah-Hartman 1728ab4382d2SGreg Kroah-Hartman /** 1729ab4382d2SGreg Kroah-Hartman * uart_set_options - setup the serial console parameters 1730ab4382d2SGreg Kroah-Hartman * @port: pointer to the serial ports uart_port structure 1731ab4382d2SGreg Kroah-Hartman * @co: console pointer 1732ab4382d2SGreg Kroah-Hartman * @baud: baud rate 1733ab4382d2SGreg Kroah-Hartman * @parity: parity character - 'n' (none), 'o' (odd), 'e' (even) 1734ab4382d2SGreg Kroah-Hartman * @bits: number of data bits 1735ab4382d2SGreg Kroah-Hartman * @flow: flow control character - 'r' (rts) 1736ab4382d2SGreg Kroah-Hartman */ 1737ab4382d2SGreg Kroah-Hartman int 1738ab4382d2SGreg Kroah-Hartman uart_set_options(struct uart_port *port, struct console *co, 1739ab4382d2SGreg Kroah-Hartman int baud, int parity, int bits, int flow) 1740ab4382d2SGreg Kroah-Hartman { 1741ab4382d2SGreg Kroah-Hartman struct ktermios termios; 1742ab4382d2SGreg Kroah-Hartman static struct ktermios dummy; 1743ab4382d2SGreg Kroah-Hartman int i; 1744ab4382d2SGreg Kroah-Hartman 1745ab4382d2SGreg Kroah-Hartman /* 1746ab4382d2SGreg Kroah-Hartman * Ensure that the serial console lock is initialised 1747ab4382d2SGreg Kroah-Hartman * early. 1748ab4382d2SGreg Kroah-Hartman */ 1749ab4382d2SGreg Kroah-Hartman spin_lock_init(&port->lock); 1750ab4382d2SGreg Kroah-Hartman lockdep_set_class(&port->lock, &port_lock_key); 1751ab4382d2SGreg Kroah-Hartman 1752ab4382d2SGreg Kroah-Hartman memset(&termios, 0, sizeof(struct ktermios)); 1753ab4382d2SGreg Kroah-Hartman 1754ab4382d2SGreg Kroah-Hartman termios.c_cflag = CREAD | HUPCL | CLOCAL; 1755ab4382d2SGreg Kroah-Hartman 1756ab4382d2SGreg Kroah-Hartman /* 1757ab4382d2SGreg Kroah-Hartman * Construct a cflag setting. 1758ab4382d2SGreg Kroah-Hartman */ 1759ab4382d2SGreg Kroah-Hartman for (i = 0; baud_rates[i].rate; i++) 1760ab4382d2SGreg Kroah-Hartman if (baud_rates[i].rate <= baud) 1761ab4382d2SGreg Kroah-Hartman break; 1762ab4382d2SGreg Kroah-Hartman 1763ab4382d2SGreg Kroah-Hartman termios.c_cflag |= baud_rates[i].cflag; 1764ab4382d2SGreg Kroah-Hartman 1765ab4382d2SGreg Kroah-Hartman if (bits == 7) 1766ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CS7; 1767ab4382d2SGreg Kroah-Hartman else 1768ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CS8; 1769ab4382d2SGreg Kroah-Hartman 1770ab4382d2SGreg Kroah-Hartman switch (parity) { 1771ab4382d2SGreg Kroah-Hartman case 'o': case 'O': 1772ab4382d2SGreg Kroah-Hartman termios.c_cflag |= PARODD; 1773ab4382d2SGreg Kroah-Hartman /*fall through*/ 1774ab4382d2SGreg Kroah-Hartman case 'e': case 'E': 1775ab4382d2SGreg Kroah-Hartman termios.c_cflag |= PARENB; 1776ab4382d2SGreg Kroah-Hartman break; 1777ab4382d2SGreg Kroah-Hartman } 1778ab4382d2SGreg Kroah-Hartman 1779ab4382d2SGreg Kroah-Hartman if (flow == 'r') 1780ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CRTSCTS; 1781ab4382d2SGreg Kroah-Hartman 1782ab4382d2SGreg Kroah-Hartman /* 1783ab4382d2SGreg Kroah-Hartman * some uarts on other side don't support no flow control. 1784ab4382d2SGreg Kroah-Hartman * So we set * DTR in host uart to make them happy 1785ab4382d2SGreg Kroah-Hartman */ 1786ab4382d2SGreg Kroah-Hartman port->mctrl |= TIOCM_DTR; 1787ab4382d2SGreg Kroah-Hartman 1788ab4382d2SGreg Kroah-Hartman port->ops->set_termios(port, &termios, &dummy); 1789ab4382d2SGreg Kroah-Hartman /* 1790ab4382d2SGreg Kroah-Hartman * Allow the setting of the UART parameters with a NULL console 1791ab4382d2SGreg Kroah-Hartman * too: 1792ab4382d2SGreg Kroah-Hartman */ 1793ab4382d2SGreg Kroah-Hartman if (co) 1794ab4382d2SGreg Kroah-Hartman co->cflag = termios.c_cflag; 1795ab4382d2SGreg Kroah-Hartman 1796ab4382d2SGreg Kroah-Hartman return 0; 1797ab4382d2SGreg Kroah-Hartman } 1798ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_set_options); 1799ab4382d2SGreg Kroah-Hartman #endif /* CONFIG_SERIAL_CORE_CONSOLE */ 1800ab4382d2SGreg Kroah-Hartman 1801cf75525fSJiri Slaby /** 1802cf75525fSJiri Slaby * uart_change_pm - set power state of the port 1803cf75525fSJiri Slaby * 1804cf75525fSJiri Slaby * @state: port descriptor 1805cf75525fSJiri Slaby * @pm_state: new state 1806cf75525fSJiri Slaby * 1807cf75525fSJiri Slaby * Locking: port->mutex has to be held 1808cf75525fSJiri Slaby */ 1809ab4382d2SGreg Kroah-Hartman static void uart_change_pm(struct uart_state *state, int pm_state) 1810ab4382d2SGreg Kroah-Hartman { 1811ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 1812ab4382d2SGreg Kroah-Hartman 1813ab4382d2SGreg Kroah-Hartman if (state->pm_state != pm_state) { 1814ab4382d2SGreg Kroah-Hartman if (port->ops->pm) 1815ab4382d2SGreg Kroah-Hartman port->ops->pm(port, pm_state, state->pm_state); 1816ab4382d2SGreg Kroah-Hartman state->pm_state = pm_state; 1817ab4382d2SGreg Kroah-Hartman } 1818ab4382d2SGreg Kroah-Hartman } 1819ab4382d2SGreg Kroah-Hartman 1820ab4382d2SGreg Kroah-Hartman struct uart_match { 1821ab4382d2SGreg Kroah-Hartman struct uart_port *port; 1822ab4382d2SGreg Kroah-Hartman struct uart_driver *driver; 1823ab4382d2SGreg Kroah-Hartman }; 1824ab4382d2SGreg Kroah-Hartman 1825ab4382d2SGreg Kroah-Hartman static int serial_match_port(struct device *dev, void *data) 1826ab4382d2SGreg Kroah-Hartman { 1827ab4382d2SGreg Kroah-Hartman struct uart_match *match = data; 1828ab4382d2SGreg Kroah-Hartman struct tty_driver *tty_drv = match->driver->tty_driver; 1829ab4382d2SGreg Kroah-Hartman dev_t devt = MKDEV(tty_drv->major, tty_drv->minor_start) + 1830ab4382d2SGreg Kroah-Hartman match->port->line; 1831ab4382d2SGreg Kroah-Hartman 1832ab4382d2SGreg Kroah-Hartman return dev->devt == devt; /* Actually, only one tty per port */ 1833ab4382d2SGreg Kroah-Hartman } 1834ab4382d2SGreg Kroah-Hartman 1835ab4382d2SGreg Kroah-Hartman int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport) 1836ab4382d2SGreg Kroah-Hartman { 1837ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 1838ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1839ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 1840ab4382d2SGreg Kroah-Hartman struct uart_match match = {uport, drv}; 1841ab4382d2SGreg Kroah-Hartman 1842ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1843ab4382d2SGreg Kroah-Hartman 1844ab4382d2SGreg Kroah-Hartman tty_dev = device_find_child(uport->dev, &match, serial_match_port); 1845ab4382d2SGreg Kroah-Hartman if (device_may_wakeup(tty_dev)) { 1846ab4382d2SGreg Kroah-Hartman if (!enable_irq_wake(uport->irq)) 1847ab4382d2SGreg Kroah-Hartman uport->irq_wake = 1; 1848ab4382d2SGreg Kroah-Hartman put_device(tty_dev); 1849ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1850ab4382d2SGreg Kroah-Hartman return 0; 1851ab4382d2SGreg Kroah-Hartman } 1852ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) 1853ab4382d2SGreg Kroah-Hartman uport->suspended = 1; 1854ab4382d2SGreg Kroah-Hartman 1855ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_INITIALIZED) { 1856ab4382d2SGreg Kroah-Hartman const struct uart_ops *ops = uport->ops; 1857ab4382d2SGreg Kroah-Hartman int tries; 1858ab4382d2SGreg Kroah-Hartman 1859ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) { 1860ab4382d2SGreg Kroah-Hartman set_bit(ASYNCB_SUSPENDED, &port->flags); 1861ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_INITIALIZED, &port->flags); 1862ab4382d2SGreg Kroah-Hartman 1863ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1864ab4382d2SGreg Kroah-Hartman ops->stop_tx(uport); 1865ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, 0); 1866ab4382d2SGreg Kroah-Hartman ops->stop_rx(uport); 1867ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1868ab4382d2SGreg Kroah-Hartman } 1869ab4382d2SGreg Kroah-Hartman 1870ab4382d2SGreg Kroah-Hartman /* 1871ab4382d2SGreg Kroah-Hartman * Wait for the transmitter to empty. 1872ab4382d2SGreg Kroah-Hartman */ 1873ab4382d2SGreg Kroah-Hartman for (tries = 3; !ops->tx_empty(uport) && tries; tries--) 1874ab4382d2SGreg Kroah-Hartman msleep(10); 1875ab4382d2SGreg Kroah-Hartman if (!tries) 1876ab4382d2SGreg Kroah-Hartman printk(KERN_ERR "%s%s%s%d: Unable to drain " 1877ab4382d2SGreg Kroah-Hartman "transmitter\n", 1878ab4382d2SGreg Kroah-Hartman uport->dev ? dev_name(uport->dev) : "", 1879ab4382d2SGreg Kroah-Hartman uport->dev ? ": " : "", 1880ab4382d2SGreg Kroah-Hartman drv->dev_name, 1881ab4382d2SGreg Kroah-Hartman drv->tty_driver->name_base + uport->line); 1882ab4382d2SGreg Kroah-Hartman 1883ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) 1884ab4382d2SGreg Kroah-Hartman ops->shutdown(uport); 1885ab4382d2SGreg Kroah-Hartman } 1886ab4382d2SGreg Kroah-Hartman 1887ab4382d2SGreg Kroah-Hartman /* 1888ab4382d2SGreg Kroah-Hartman * Disable the console device before suspending. 1889ab4382d2SGreg Kroah-Hartman */ 1890ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled && uart_console(uport)) 1891ab4382d2SGreg Kroah-Hartman console_stop(uport->cons); 1892ab4382d2SGreg Kroah-Hartman 1893ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) 1894ab4382d2SGreg Kroah-Hartman uart_change_pm(state, 3); 1895ab4382d2SGreg Kroah-Hartman 1896ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1897ab4382d2SGreg Kroah-Hartman 1898ab4382d2SGreg Kroah-Hartman return 0; 1899ab4382d2SGreg Kroah-Hartman } 1900ab4382d2SGreg Kroah-Hartman 1901ab4382d2SGreg Kroah-Hartman int uart_resume_port(struct uart_driver *drv, struct uart_port *uport) 1902ab4382d2SGreg Kroah-Hartman { 1903ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 1904ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1905ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 1906ab4382d2SGreg Kroah-Hartman struct uart_match match = {uport, drv}; 1907ab4382d2SGreg Kroah-Hartman struct ktermios termios; 1908ab4382d2SGreg Kroah-Hartman 1909ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1910ab4382d2SGreg Kroah-Hartman 1911ab4382d2SGreg Kroah-Hartman tty_dev = device_find_child(uport->dev, &match, serial_match_port); 1912ab4382d2SGreg Kroah-Hartman if (!uport->suspended && device_may_wakeup(tty_dev)) { 1913ab4382d2SGreg Kroah-Hartman if (uport->irq_wake) { 1914ab4382d2SGreg Kroah-Hartman disable_irq_wake(uport->irq); 1915ab4382d2SGreg Kroah-Hartman uport->irq_wake = 0; 1916ab4382d2SGreg Kroah-Hartman } 1917ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1918ab4382d2SGreg Kroah-Hartman return 0; 1919ab4382d2SGreg Kroah-Hartman } 1920ab4382d2SGreg Kroah-Hartman uport->suspended = 0; 1921ab4382d2SGreg Kroah-Hartman 1922ab4382d2SGreg Kroah-Hartman /* 1923ab4382d2SGreg Kroah-Hartman * Re-enable the console device after suspending. 1924ab4382d2SGreg Kroah-Hartman */ 19255933a161SYin Kangkai if (uart_console(uport)) { 1926ab4382d2SGreg Kroah-Hartman /* 1927ab4382d2SGreg Kroah-Hartman * First try to use the console cflag setting. 1928ab4382d2SGreg Kroah-Hartman */ 1929ab4382d2SGreg Kroah-Hartman memset(&termios, 0, sizeof(struct ktermios)); 1930ab4382d2SGreg Kroah-Hartman termios.c_cflag = uport->cons->cflag; 1931ab4382d2SGreg Kroah-Hartman 1932ab4382d2SGreg Kroah-Hartman /* 1933ab4382d2SGreg Kroah-Hartman * If that's unset, use the tty termios setting. 1934ab4382d2SGreg Kroah-Hartman */ 1935ab4382d2SGreg Kroah-Hartman if (port->tty && port->tty->termios && termios.c_cflag == 0) 1936ab4382d2SGreg Kroah-Hartman termios = *(port->tty->termios); 1937ab4382d2SGreg Kroah-Hartman 193894abc56fSNing Jiang if (console_suspend_enabled) 193994abc56fSNing Jiang uart_change_pm(state, 0); 1940ab4382d2SGreg Kroah-Hartman uport->ops->set_termios(uport, &termios, NULL); 19415933a161SYin Kangkai if (console_suspend_enabled) 1942ab4382d2SGreg Kroah-Hartman console_start(uport->cons); 1943ab4382d2SGreg Kroah-Hartman } 1944ab4382d2SGreg Kroah-Hartman 1945ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_SUSPENDED) { 1946ab4382d2SGreg Kroah-Hartman const struct uart_ops *ops = uport->ops; 1947ab4382d2SGreg Kroah-Hartman int ret; 1948ab4382d2SGreg Kroah-Hartman 1949ab4382d2SGreg Kroah-Hartman uart_change_pm(state, 0); 1950ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1951ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, 0); 1952ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1953ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) { 1954ab4382d2SGreg Kroah-Hartman /* Protected by port mutex for now */ 1955ab4382d2SGreg Kroah-Hartman struct tty_struct *tty = port->tty; 1956ab4382d2SGreg Kroah-Hartman ret = ops->startup(uport); 1957ab4382d2SGreg Kroah-Hartman if (ret == 0) { 1958ab4382d2SGreg Kroah-Hartman if (tty) 1959ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 1960ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1961ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, uport->mctrl); 1962ab4382d2SGreg Kroah-Hartman ops->start_tx(uport); 1963ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1964ab4382d2SGreg Kroah-Hartman set_bit(ASYNCB_INITIALIZED, &port->flags); 1965ab4382d2SGreg Kroah-Hartman } else { 1966ab4382d2SGreg Kroah-Hartman /* 1967ab4382d2SGreg Kroah-Hartman * Failed to resume - maybe hardware went away? 1968ab4382d2SGreg Kroah-Hartman * Clear the "initialized" flag so we won't try 1969ab4382d2SGreg Kroah-Hartman * to call the low level drivers shutdown method. 1970ab4382d2SGreg Kroah-Hartman */ 1971ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 1972ab4382d2SGreg Kroah-Hartman } 1973ab4382d2SGreg Kroah-Hartman } 1974ab4382d2SGreg Kroah-Hartman 1975ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_SUSPENDED, &port->flags); 1976ab4382d2SGreg Kroah-Hartman } 1977ab4382d2SGreg Kroah-Hartman 1978ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1979ab4382d2SGreg Kroah-Hartman 1980ab4382d2SGreg Kroah-Hartman return 0; 1981ab4382d2SGreg Kroah-Hartman } 1982ab4382d2SGreg Kroah-Hartman 1983ab4382d2SGreg Kroah-Hartman static inline void 1984ab4382d2SGreg Kroah-Hartman uart_report_port(struct uart_driver *drv, struct uart_port *port) 1985ab4382d2SGreg Kroah-Hartman { 1986ab4382d2SGreg Kroah-Hartman char address[64]; 1987ab4382d2SGreg Kroah-Hartman 1988ab4382d2SGreg Kroah-Hartman switch (port->iotype) { 1989ab4382d2SGreg Kroah-Hartman case UPIO_PORT: 1990ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), "I/O 0x%lx", port->iobase); 1991ab4382d2SGreg Kroah-Hartman break; 1992ab4382d2SGreg Kroah-Hartman case UPIO_HUB6: 1993ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), 1994ab4382d2SGreg Kroah-Hartman "I/O 0x%lx offset 0x%x", port->iobase, port->hub6); 1995ab4382d2SGreg Kroah-Hartman break; 1996ab4382d2SGreg Kroah-Hartman case UPIO_MEM: 1997ab4382d2SGreg Kroah-Hartman case UPIO_MEM32: 1998ab4382d2SGreg Kroah-Hartman case UPIO_AU: 1999ab4382d2SGreg Kroah-Hartman case UPIO_TSI: 2000ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), 2001ab4382d2SGreg Kroah-Hartman "MMIO 0x%llx", (unsigned long long)port->mapbase); 2002ab4382d2SGreg Kroah-Hartman break; 2003ab4382d2SGreg Kroah-Hartman default: 2004ab4382d2SGreg Kroah-Hartman strlcpy(address, "*unknown*", sizeof(address)); 2005ab4382d2SGreg Kroah-Hartman break; 2006ab4382d2SGreg Kroah-Hartman } 2007ab4382d2SGreg Kroah-Hartman 2008ab4382d2SGreg Kroah-Hartman printk(KERN_INFO "%s%s%s%d at %s (irq = %d) is a %s\n", 2009ab4382d2SGreg Kroah-Hartman port->dev ? dev_name(port->dev) : "", 2010ab4382d2SGreg Kroah-Hartman port->dev ? ": " : "", 2011ab4382d2SGreg Kroah-Hartman drv->dev_name, 2012ab4382d2SGreg Kroah-Hartman drv->tty_driver->name_base + port->line, 2013ab4382d2SGreg Kroah-Hartman address, port->irq, uart_type(port)); 2014ab4382d2SGreg Kroah-Hartman } 2015ab4382d2SGreg Kroah-Hartman 2016ab4382d2SGreg Kroah-Hartman static void 2017ab4382d2SGreg Kroah-Hartman uart_configure_port(struct uart_driver *drv, struct uart_state *state, 2018ab4382d2SGreg Kroah-Hartman struct uart_port *port) 2019ab4382d2SGreg Kroah-Hartman { 2020ab4382d2SGreg Kroah-Hartman unsigned int flags; 2021ab4382d2SGreg Kroah-Hartman 2022ab4382d2SGreg Kroah-Hartman /* 2023ab4382d2SGreg Kroah-Hartman * If there isn't a port here, don't do anything further. 2024ab4382d2SGreg Kroah-Hartman */ 2025ab4382d2SGreg Kroah-Hartman if (!port->iobase && !port->mapbase && !port->membase) 2026ab4382d2SGreg Kroah-Hartman return; 2027ab4382d2SGreg Kroah-Hartman 2028ab4382d2SGreg Kroah-Hartman /* 2029ab4382d2SGreg Kroah-Hartman * Now do the auto configuration stuff. Note that config_port 2030ab4382d2SGreg Kroah-Hartman * is expected to claim the resources and map the port for us. 2031ab4382d2SGreg Kroah-Hartman */ 2032ab4382d2SGreg Kroah-Hartman flags = 0; 2033ab4382d2SGreg Kroah-Hartman if (port->flags & UPF_AUTO_IRQ) 2034ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_IRQ; 2035ab4382d2SGreg Kroah-Hartman if (port->flags & UPF_BOOT_AUTOCONF) { 2036ab4382d2SGreg Kroah-Hartman if (!(port->flags & UPF_FIXED_TYPE)) { 2037ab4382d2SGreg Kroah-Hartman port->type = PORT_UNKNOWN; 2038ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_TYPE; 2039ab4382d2SGreg Kroah-Hartman } 2040ab4382d2SGreg Kroah-Hartman port->ops->config_port(port, flags); 2041ab4382d2SGreg Kroah-Hartman } 2042ab4382d2SGreg Kroah-Hartman 2043ab4382d2SGreg Kroah-Hartman if (port->type != PORT_UNKNOWN) { 2044ab4382d2SGreg Kroah-Hartman unsigned long flags; 2045ab4382d2SGreg Kroah-Hartman 2046ab4382d2SGreg Kroah-Hartman uart_report_port(drv, port); 2047ab4382d2SGreg Kroah-Hartman 2048ab4382d2SGreg Kroah-Hartman /* Power up port for set_mctrl() */ 2049ab4382d2SGreg Kroah-Hartman uart_change_pm(state, 0); 2050ab4382d2SGreg Kroah-Hartman 2051ab4382d2SGreg Kroah-Hartman /* 2052ab4382d2SGreg Kroah-Hartman * Ensure that the modem control lines are de-activated. 2053ab4382d2SGreg Kroah-Hartman * keep the DTR setting that is set in uart_set_options() 2054ab4382d2SGreg Kroah-Hartman * We probably don't need a spinlock around this, but 2055ab4382d2SGreg Kroah-Hartman */ 2056ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 2057ab4382d2SGreg Kroah-Hartman port->ops->set_mctrl(port, port->mctrl & TIOCM_DTR); 2058ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 2059ab4382d2SGreg Kroah-Hartman 2060ab4382d2SGreg Kroah-Hartman /* 2061ab4382d2SGreg Kroah-Hartman * If this driver supports console, and it hasn't been 2062ab4382d2SGreg Kroah-Hartman * successfully registered yet, try to re-register it. 2063ab4382d2SGreg Kroah-Hartman * It may be that the port was not available. 2064ab4382d2SGreg Kroah-Hartman */ 2065ab4382d2SGreg Kroah-Hartman if (port->cons && !(port->cons->flags & CON_ENABLED)) 2066ab4382d2SGreg Kroah-Hartman register_console(port->cons); 2067ab4382d2SGreg Kroah-Hartman 2068ab4382d2SGreg Kroah-Hartman /* 2069ab4382d2SGreg Kroah-Hartman * Power down all ports by default, except the 2070ab4382d2SGreg Kroah-Hartman * console if we have one. 2071ab4382d2SGreg Kroah-Hartman */ 2072ab4382d2SGreg Kroah-Hartman if (!uart_console(port)) 2073ab4382d2SGreg Kroah-Hartman uart_change_pm(state, 3); 2074ab4382d2SGreg Kroah-Hartman } 2075ab4382d2SGreg Kroah-Hartman } 2076ab4382d2SGreg Kroah-Hartman 2077ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 2078ab4382d2SGreg Kroah-Hartman 2079ab4382d2SGreg Kroah-Hartman static int uart_poll_init(struct tty_driver *driver, int line, char *options) 2080ab4382d2SGreg Kroah-Hartman { 2081ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2082ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2083ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2084ab4382d2SGreg Kroah-Hartman int baud = 9600; 2085ab4382d2SGreg Kroah-Hartman int bits = 8; 2086ab4382d2SGreg Kroah-Hartman int parity = 'n'; 2087ab4382d2SGreg Kroah-Hartman int flow = 'n'; 2088ab4382d2SGreg Kroah-Hartman 2089ab4382d2SGreg Kroah-Hartman if (!state || !state->uart_port) 2090ab4382d2SGreg Kroah-Hartman return -1; 2091ab4382d2SGreg Kroah-Hartman 2092ab4382d2SGreg Kroah-Hartman port = state->uart_port; 2093ab4382d2SGreg Kroah-Hartman if (!(port->ops->poll_get_char && port->ops->poll_put_char)) 2094ab4382d2SGreg Kroah-Hartman return -1; 2095ab4382d2SGreg Kroah-Hartman 2096ab4382d2SGreg Kroah-Hartman if (options) { 2097ab4382d2SGreg Kroah-Hartman uart_parse_options(options, &baud, &parity, &bits, &flow); 2098ab4382d2SGreg Kroah-Hartman return uart_set_options(port, NULL, baud, parity, bits, flow); 2099ab4382d2SGreg Kroah-Hartman } 2100ab4382d2SGreg Kroah-Hartman 2101ab4382d2SGreg Kroah-Hartman return 0; 2102ab4382d2SGreg Kroah-Hartman } 2103ab4382d2SGreg Kroah-Hartman 2104ab4382d2SGreg Kroah-Hartman static int uart_poll_get_char(struct tty_driver *driver, int line) 2105ab4382d2SGreg Kroah-Hartman { 2106ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2107ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2108ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2109ab4382d2SGreg Kroah-Hartman 2110ab4382d2SGreg Kroah-Hartman if (!state || !state->uart_port) 2111ab4382d2SGreg Kroah-Hartman return -1; 2112ab4382d2SGreg Kroah-Hartman 2113ab4382d2SGreg Kroah-Hartman port = state->uart_port; 2114ab4382d2SGreg Kroah-Hartman return port->ops->poll_get_char(port); 2115ab4382d2SGreg Kroah-Hartman } 2116ab4382d2SGreg Kroah-Hartman 2117ab4382d2SGreg Kroah-Hartman static void uart_poll_put_char(struct tty_driver *driver, int line, char ch) 2118ab4382d2SGreg Kroah-Hartman { 2119ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2120ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2121ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2122ab4382d2SGreg Kroah-Hartman 2123ab4382d2SGreg Kroah-Hartman if (!state || !state->uart_port) 2124ab4382d2SGreg Kroah-Hartman return; 2125ab4382d2SGreg Kroah-Hartman 2126ab4382d2SGreg Kroah-Hartman port = state->uart_port; 2127ab4382d2SGreg Kroah-Hartman port->ops->poll_put_char(port, ch); 2128ab4382d2SGreg Kroah-Hartman } 2129ab4382d2SGreg Kroah-Hartman #endif 2130ab4382d2SGreg Kroah-Hartman 2131ab4382d2SGreg Kroah-Hartman static const struct tty_operations uart_ops = { 2132ab4382d2SGreg Kroah-Hartman .open = uart_open, 2133ab4382d2SGreg Kroah-Hartman .close = uart_close, 2134ab4382d2SGreg Kroah-Hartman .write = uart_write, 2135ab4382d2SGreg Kroah-Hartman .put_char = uart_put_char, 2136ab4382d2SGreg Kroah-Hartman .flush_chars = uart_flush_chars, 2137ab4382d2SGreg Kroah-Hartman .write_room = uart_write_room, 2138ab4382d2SGreg Kroah-Hartman .chars_in_buffer= uart_chars_in_buffer, 2139ab4382d2SGreg Kroah-Hartman .flush_buffer = uart_flush_buffer, 2140ab4382d2SGreg Kroah-Hartman .ioctl = uart_ioctl, 2141ab4382d2SGreg Kroah-Hartman .throttle = uart_throttle, 2142ab4382d2SGreg Kroah-Hartman .unthrottle = uart_unthrottle, 2143ab4382d2SGreg Kroah-Hartman .send_xchar = uart_send_xchar, 2144ab4382d2SGreg Kroah-Hartman .set_termios = uart_set_termios, 2145ab4382d2SGreg Kroah-Hartman .set_ldisc = uart_set_ldisc, 2146ab4382d2SGreg Kroah-Hartman .stop = uart_stop, 2147ab4382d2SGreg Kroah-Hartman .start = uart_start, 2148ab4382d2SGreg Kroah-Hartman .hangup = uart_hangup, 2149ab4382d2SGreg Kroah-Hartman .break_ctl = uart_break_ctl, 2150ab4382d2SGreg Kroah-Hartman .wait_until_sent= uart_wait_until_sent, 2151ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_PROC_FS 2152ab4382d2SGreg Kroah-Hartman .proc_fops = &uart_proc_fops, 2153ab4382d2SGreg Kroah-Hartman #endif 2154ab4382d2SGreg Kroah-Hartman .tiocmget = uart_tiocmget, 2155ab4382d2SGreg Kroah-Hartman .tiocmset = uart_tiocmset, 2156ab4382d2SGreg Kroah-Hartman .get_icount = uart_get_icount, 2157ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 2158ab4382d2SGreg Kroah-Hartman .poll_init = uart_poll_init, 2159ab4382d2SGreg Kroah-Hartman .poll_get_char = uart_poll_get_char, 2160ab4382d2SGreg Kroah-Hartman .poll_put_char = uart_poll_put_char, 2161ab4382d2SGreg Kroah-Hartman #endif 2162ab4382d2SGreg Kroah-Hartman }; 2163ab4382d2SGreg Kroah-Hartman 2164ab4382d2SGreg Kroah-Hartman static const struct tty_port_operations uart_port_ops = { 2165ab4382d2SGreg Kroah-Hartman .carrier_raised = uart_carrier_raised, 2166ab4382d2SGreg Kroah-Hartman .dtr_rts = uart_dtr_rts, 2167ab4382d2SGreg Kroah-Hartman }; 2168ab4382d2SGreg Kroah-Hartman 2169ab4382d2SGreg Kroah-Hartman /** 2170ab4382d2SGreg Kroah-Hartman * uart_register_driver - register a driver with the uart core layer 2171ab4382d2SGreg Kroah-Hartman * @drv: low level driver structure 2172ab4382d2SGreg Kroah-Hartman * 2173ab4382d2SGreg Kroah-Hartman * Register a uart driver with the core driver. We in turn register 2174ab4382d2SGreg Kroah-Hartman * with the tty layer, and initialise the core driver per-port state. 2175ab4382d2SGreg Kroah-Hartman * 2176ab4382d2SGreg Kroah-Hartman * We have a proc file in /proc/tty/driver which is named after the 2177ab4382d2SGreg Kroah-Hartman * normal driver. 2178ab4382d2SGreg Kroah-Hartman * 2179ab4382d2SGreg Kroah-Hartman * drv->port should be NULL, and the per-port structures should be 2180ab4382d2SGreg Kroah-Hartman * registered using uart_add_one_port after this call has succeeded. 2181ab4382d2SGreg Kroah-Hartman */ 2182ab4382d2SGreg Kroah-Hartman int uart_register_driver(struct uart_driver *drv) 2183ab4382d2SGreg Kroah-Hartman { 2184ab4382d2SGreg Kroah-Hartman struct tty_driver *normal; 2185ab4382d2SGreg Kroah-Hartman int i, retval; 2186ab4382d2SGreg Kroah-Hartman 2187ab4382d2SGreg Kroah-Hartman BUG_ON(drv->state); 2188ab4382d2SGreg Kroah-Hartman 2189ab4382d2SGreg Kroah-Hartman /* 2190ab4382d2SGreg Kroah-Hartman * Maybe we should be using a slab cache for this, especially if 2191ab4382d2SGreg Kroah-Hartman * we have a large number of ports to handle. 2192ab4382d2SGreg Kroah-Hartman */ 2193ab4382d2SGreg Kroah-Hartman drv->state = kzalloc(sizeof(struct uart_state) * drv->nr, GFP_KERNEL); 2194ab4382d2SGreg Kroah-Hartman if (!drv->state) 2195ab4382d2SGreg Kroah-Hartman goto out; 2196ab4382d2SGreg Kroah-Hartman 2197ab4382d2SGreg Kroah-Hartman normal = alloc_tty_driver(drv->nr); 2198ab4382d2SGreg Kroah-Hartman if (!normal) 2199ab4382d2SGreg Kroah-Hartman goto out_kfree; 2200ab4382d2SGreg Kroah-Hartman 2201ab4382d2SGreg Kroah-Hartman drv->tty_driver = normal; 2202ab4382d2SGreg Kroah-Hartman 2203ab4382d2SGreg Kroah-Hartman normal->owner = drv->owner; 2204ab4382d2SGreg Kroah-Hartman normal->driver_name = drv->driver_name; 2205ab4382d2SGreg Kroah-Hartman normal->name = drv->dev_name; 2206ab4382d2SGreg Kroah-Hartman normal->major = drv->major; 2207ab4382d2SGreg Kroah-Hartman normal->minor_start = drv->minor; 2208ab4382d2SGreg Kroah-Hartman normal->type = TTY_DRIVER_TYPE_SERIAL; 2209ab4382d2SGreg Kroah-Hartman normal->subtype = SERIAL_TYPE_NORMAL; 2210ab4382d2SGreg Kroah-Hartman normal->init_termios = tty_std_termios; 2211ab4382d2SGreg Kroah-Hartman normal->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; 2212ab4382d2SGreg Kroah-Hartman normal->init_termios.c_ispeed = normal->init_termios.c_ospeed = 9600; 2213ab4382d2SGreg Kroah-Hartman normal->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; 2214ab4382d2SGreg Kroah-Hartman normal->driver_state = drv; 2215ab4382d2SGreg Kroah-Hartman tty_set_operations(normal, &uart_ops); 2216ab4382d2SGreg Kroah-Hartman 2217ab4382d2SGreg Kroah-Hartman /* 2218ab4382d2SGreg Kroah-Hartman * Initialise the UART state(s). 2219ab4382d2SGreg Kroah-Hartman */ 2220ab4382d2SGreg Kroah-Hartman for (i = 0; i < drv->nr; i++) { 2221ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + i; 2222ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2223ab4382d2SGreg Kroah-Hartman 2224ab4382d2SGreg Kroah-Hartman tty_port_init(port); 2225ab4382d2SGreg Kroah-Hartman port->ops = &uart_port_ops; 22264cb0fbfdSJiri Slaby port->close_delay = HZ / 2; /* .5 seconds */ 22274cb0fbfdSJiri Slaby port->closing_wait = 30 * HZ;/* 30 seconds */ 2228ab4382d2SGreg Kroah-Hartman } 2229ab4382d2SGreg Kroah-Hartman 2230ab4382d2SGreg Kroah-Hartman retval = tty_register_driver(normal); 2231ab4382d2SGreg Kroah-Hartman if (retval >= 0) 2232ab4382d2SGreg Kroah-Hartman return retval; 2233ab4382d2SGreg Kroah-Hartman 2234ab4382d2SGreg Kroah-Hartman put_tty_driver(normal); 2235ab4382d2SGreg Kroah-Hartman out_kfree: 2236ab4382d2SGreg Kroah-Hartman kfree(drv->state); 2237ab4382d2SGreg Kroah-Hartman out: 2238ab4382d2SGreg Kroah-Hartman return -ENOMEM; 2239ab4382d2SGreg Kroah-Hartman } 2240ab4382d2SGreg Kroah-Hartman 2241ab4382d2SGreg Kroah-Hartman /** 2242ab4382d2SGreg Kroah-Hartman * uart_unregister_driver - remove a driver from the uart core layer 2243ab4382d2SGreg Kroah-Hartman * @drv: low level driver structure 2244ab4382d2SGreg Kroah-Hartman * 2245ab4382d2SGreg Kroah-Hartman * Remove all references to a driver from the core driver. The low 2246ab4382d2SGreg Kroah-Hartman * level driver must have removed all its ports via the 2247ab4382d2SGreg Kroah-Hartman * uart_remove_one_port() if it registered them with uart_add_one_port(). 2248ab4382d2SGreg Kroah-Hartman * (ie, drv->port == NULL) 2249ab4382d2SGreg Kroah-Hartman */ 2250ab4382d2SGreg Kroah-Hartman void uart_unregister_driver(struct uart_driver *drv) 2251ab4382d2SGreg Kroah-Hartman { 2252ab4382d2SGreg Kroah-Hartman struct tty_driver *p = drv->tty_driver; 2253ab4382d2SGreg Kroah-Hartman tty_unregister_driver(p); 2254ab4382d2SGreg Kroah-Hartman put_tty_driver(p); 2255ab4382d2SGreg Kroah-Hartman kfree(drv->state); 2256ab4382d2SGreg Kroah-Hartman drv->tty_driver = NULL; 2257ab4382d2SGreg Kroah-Hartman } 2258ab4382d2SGreg Kroah-Hartman 2259ab4382d2SGreg Kroah-Hartman struct tty_driver *uart_console_device(struct console *co, int *index) 2260ab4382d2SGreg Kroah-Hartman { 2261ab4382d2SGreg Kroah-Hartman struct uart_driver *p = co->data; 2262ab4382d2SGreg Kroah-Hartman *index = co->index; 2263ab4382d2SGreg Kroah-Hartman return p->tty_driver; 2264ab4382d2SGreg Kroah-Hartman } 2265ab4382d2SGreg Kroah-Hartman 2266ab4382d2SGreg Kroah-Hartman /** 2267ab4382d2SGreg Kroah-Hartman * uart_add_one_port - attach a driver-defined port structure 2268ab4382d2SGreg Kroah-Hartman * @drv: pointer to the uart low level driver structure for this port 2269ab4382d2SGreg Kroah-Hartman * @uport: uart port structure to use for this port. 2270ab4382d2SGreg Kroah-Hartman * 2271ab4382d2SGreg Kroah-Hartman * This allows the driver to register its own uart_port structure 2272ab4382d2SGreg Kroah-Hartman * with the core driver. The main purpose is to allow the low 2273ab4382d2SGreg Kroah-Hartman * level uart drivers to expand uart_port, rather than having yet 2274ab4382d2SGreg Kroah-Hartman * more levels of structures. 2275ab4382d2SGreg Kroah-Hartman */ 2276ab4382d2SGreg Kroah-Hartman int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport) 2277ab4382d2SGreg Kroah-Hartman { 2278ab4382d2SGreg Kroah-Hartman struct uart_state *state; 2279ab4382d2SGreg Kroah-Hartman struct tty_port *port; 2280ab4382d2SGreg Kroah-Hartman int ret = 0; 2281ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 2282ab4382d2SGreg Kroah-Hartman 2283ab4382d2SGreg Kroah-Hartman BUG_ON(in_interrupt()); 2284ab4382d2SGreg Kroah-Hartman 2285ab4382d2SGreg Kroah-Hartman if (uport->line >= drv->nr) 2286ab4382d2SGreg Kroah-Hartman return -EINVAL; 2287ab4382d2SGreg Kroah-Hartman 2288ab4382d2SGreg Kroah-Hartman state = drv->state + uport->line; 2289ab4382d2SGreg Kroah-Hartman port = &state->port; 2290ab4382d2SGreg Kroah-Hartman 2291ab4382d2SGreg Kroah-Hartman mutex_lock(&port_mutex); 2292ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2293ab4382d2SGreg Kroah-Hartman if (state->uart_port) { 2294ab4382d2SGreg Kroah-Hartman ret = -EINVAL; 2295ab4382d2SGreg Kroah-Hartman goto out; 2296ab4382d2SGreg Kroah-Hartman } 2297ab4382d2SGreg Kroah-Hartman 2298ab4382d2SGreg Kroah-Hartman state->uart_port = uport; 2299ab4382d2SGreg Kroah-Hartman state->pm_state = -1; 2300ab4382d2SGreg Kroah-Hartman 2301ab4382d2SGreg Kroah-Hartman uport->cons = drv->cons; 2302ab4382d2SGreg Kroah-Hartman uport->state = state; 2303ab4382d2SGreg Kroah-Hartman 2304ab4382d2SGreg Kroah-Hartman /* 2305ab4382d2SGreg Kroah-Hartman * If this port is a console, then the spinlock is already 2306ab4382d2SGreg Kroah-Hartman * initialised. 2307ab4382d2SGreg Kroah-Hartman */ 2308ab4382d2SGreg Kroah-Hartman if (!(uart_console(uport) && (uport->cons->flags & CON_ENABLED))) { 2309ab4382d2SGreg Kroah-Hartman spin_lock_init(&uport->lock); 2310ab4382d2SGreg Kroah-Hartman lockdep_set_class(&uport->lock, &port_lock_key); 2311ab4382d2SGreg Kroah-Hartman } 2312ab4382d2SGreg Kroah-Hartman 2313ab4382d2SGreg Kroah-Hartman uart_configure_port(drv, state, uport); 2314ab4382d2SGreg Kroah-Hartman 2315ab4382d2SGreg Kroah-Hartman /* 2316ab4382d2SGreg Kroah-Hartman * Register the port whether it's detected or not. This allows 2317ab4382d2SGreg Kroah-Hartman * setserial to be used to alter this ports parameters. 2318ab4382d2SGreg Kroah-Hartman */ 2319ab4382d2SGreg Kroah-Hartman tty_dev = tty_register_device(drv->tty_driver, uport->line, uport->dev); 2320ab4382d2SGreg Kroah-Hartman if (likely(!IS_ERR(tty_dev))) { 2321ab4382d2SGreg Kroah-Hartman device_init_wakeup(tty_dev, 1); 2322ab4382d2SGreg Kroah-Hartman device_set_wakeup_enable(tty_dev, 0); 2323ab4382d2SGreg Kroah-Hartman } else 2324ab4382d2SGreg Kroah-Hartman printk(KERN_ERR "Cannot register tty device on line %d\n", 2325ab4382d2SGreg Kroah-Hartman uport->line); 2326ab4382d2SGreg Kroah-Hartman 2327ab4382d2SGreg Kroah-Hartman /* 2328ab4382d2SGreg Kroah-Hartman * Ensure UPF_DEAD is not set. 2329ab4382d2SGreg Kroah-Hartman */ 2330ab4382d2SGreg Kroah-Hartman uport->flags &= ~UPF_DEAD; 2331ab4382d2SGreg Kroah-Hartman 2332ab4382d2SGreg Kroah-Hartman out: 2333ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2334ab4382d2SGreg Kroah-Hartman mutex_unlock(&port_mutex); 2335ab4382d2SGreg Kroah-Hartman 2336ab4382d2SGreg Kroah-Hartman return ret; 2337ab4382d2SGreg Kroah-Hartman } 2338ab4382d2SGreg Kroah-Hartman 2339ab4382d2SGreg Kroah-Hartman /** 2340ab4382d2SGreg Kroah-Hartman * uart_remove_one_port - detach a driver defined port structure 2341ab4382d2SGreg Kroah-Hartman * @drv: pointer to the uart low level driver structure for this port 2342ab4382d2SGreg Kroah-Hartman * @uport: uart port structure for this port 2343ab4382d2SGreg Kroah-Hartman * 2344ab4382d2SGreg Kroah-Hartman * This unhooks (and hangs up) the specified port structure from the 2345ab4382d2SGreg Kroah-Hartman * core driver. No further calls will be made to the low-level code 2346ab4382d2SGreg Kroah-Hartman * for this port. 2347ab4382d2SGreg Kroah-Hartman */ 2348ab4382d2SGreg Kroah-Hartman int uart_remove_one_port(struct uart_driver *drv, struct uart_port *uport) 2349ab4382d2SGreg Kroah-Hartman { 2350ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 2351ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2352ab4382d2SGreg Kroah-Hartman 2353ab4382d2SGreg Kroah-Hartman BUG_ON(in_interrupt()); 2354ab4382d2SGreg Kroah-Hartman 2355ab4382d2SGreg Kroah-Hartman if (state->uart_port != uport) 2356ab4382d2SGreg Kroah-Hartman printk(KERN_ALERT "Removing wrong port: %p != %p\n", 2357ab4382d2SGreg Kroah-Hartman state->uart_port, uport); 2358ab4382d2SGreg Kroah-Hartman 2359ab4382d2SGreg Kroah-Hartman mutex_lock(&port_mutex); 2360ab4382d2SGreg Kroah-Hartman 2361ab4382d2SGreg Kroah-Hartman /* 2362ab4382d2SGreg Kroah-Hartman * Mark the port "dead" - this prevents any opens from 2363ab4382d2SGreg Kroah-Hartman * succeeding while we shut down the port. 2364ab4382d2SGreg Kroah-Hartman */ 2365ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2366ab4382d2SGreg Kroah-Hartman uport->flags |= UPF_DEAD; 2367ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2368ab4382d2SGreg Kroah-Hartman 2369ab4382d2SGreg Kroah-Hartman /* 2370ab4382d2SGreg Kroah-Hartman * Remove the devices from the tty layer 2371ab4382d2SGreg Kroah-Hartman */ 2372ab4382d2SGreg Kroah-Hartman tty_unregister_device(drv->tty_driver, uport->line); 2373ab4382d2SGreg Kroah-Hartman 2374ab4382d2SGreg Kroah-Hartman if (port->tty) 2375ab4382d2SGreg Kroah-Hartman tty_vhangup(port->tty); 2376ab4382d2SGreg Kroah-Hartman 2377ab4382d2SGreg Kroah-Hartman /* 2378ab4382d2SGreg Kroah-Hartman * Free the port IO and memory resources, if any. 2379ab4382d2SGreg Kroah-Hartman */ 2380ab4382d2SGreg Kroah-Hartman if (uport->type != PORT_UNKNOWN) 2381ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 2382ab4382d2SGreg Kroah-Hartman 2383ab4382d2SGreg Kroah-Hartman /* 2384ab4382d2SGreg Kroah-Hartman * Indicate that there isn't a port here anymore. 2385ab4382d2SGreg Kroah-Hartman */ 2386ab4382d2SGreg Kroah-Hartman uport->type = PORT_UNKNOWN; 2387ab4382d2SGreg Kroah-Hartman 2388ab4382d2SGreg Kroah-Hartman state->uart_port = NULL; 2389ab4382d2SGreg Kroah-Hartman mutex_unlock(&port_mutex); 2390ab4382d2SGreg Kroah-Hartman 2391ab4382d2SGreg Kroah-Hartman return 0; 2392ab4382d2SGreg Kroah-Hartman } 2393ab4382d2SGreg Kroah-Hartman 2394ab4382d2SGreg Kroah-Hartman /* 2395ab4382d2SGreg Kroah-Hartman * Are the two ports equivalent? 2396ab4382d2SGreg Kroah-Hartman */ 2397ab4382d2SGreg Kroah-Hartman int uart_match_port(struct uart_port *port1, struct uart_port *port2) 2398ab4382d2SGreg Kroah-Hartman { 2399ab4382d2SGreg Kroah-Hartman if (port1->iotype != port2->iotype) 2400ab4382d2SGreg Kroah-Hartman return 0; 2401ab4382d2SGreg Kroah-Hartman 2402ab4382d2SGreg Kroah-Hartman switch (port1->iotype) { 2403ab4382d2SGreg Kroah-Hartman case UPIO_PORT: 2404ab4382d2SGreg Kroah-Hartman return (port1->iobase == port2->iobase); 2405ab4382d2SGreg Kroah-Hartman case UPIO_HUB6: 2406ab4382d2SGreg Kroah-Hartman return (port1->iobase == port2->iobase) && 2407ab4382d2SGreg Kroah-Hartman (port1->hub6 == port2->hub6); 2408ab4382d2SGreg Kroah-Hartman case UPIO_MEM: 2409ab4382d2SGreg Kroah-Hartman case UPIO_MEM32: 2410ab4382d2SGreg Kroah-Hartman case UPIO_AU: 2411ab4382d2SGreg Kroah-Hartman case UPIO_TSI: 2412ab4382d2SGreg Kroah-Hartman return (port1->mapbase == port2->mapbase); 2413ab4382d2SGreg Kroah-Hartman } 2414ab4382d2SGreg Kroah-Hartman return 0; 2415ab4382d2SGreg Kroah-Hartman } 2416ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_match_port); 2417ab4382d2SGreg Kroah-Hartman 2418027d7dacSJiri Slaby /** 2419027d7dacSJiri Slaby * uart_handle_dcd_change - handle a change of carrier detect state 2420027d7dacSJiri Slaby * @uport: uart_port structure for the open port 2421027d7dacSJiri Slaby * @status: new carrier detect status, nonzero if active 2422027d7dacSJiri Slaby */ 2423027d7dacSJiri Slaby void uart_handle_dcd_change(struct uart_port *uport, unsigned int status) 2424027d7dacSJiri Slaby { 2425027d7dacSJiri Slaby struct uart_state *state = uport->state; 2426027d7dacSJiri Slaby struct tty_port *port = &state->port; 2427027d7dacSJiri Slaby struct tty_ldisc *ld = tty_ldisc_ref(port->tty); 2428027d7dacSJiri Slaby struct pps_event_time ts; 2429027d7dacSJiri Slaby 2430027d7dacSJiri Slaby if (ld && ld->ops->dcd_change) 2431027d7dacSJiri Slaby pps_get_ts(&ts); 2432027d7dacSJiri Slaby 2433027d7dacSJiri Slaby uport->icount.dcd++; 2434027d7dacSJiri Slaby #ifdef CONFIG_HARD_PPS 2435027d7dacSJiri Slaby if ((uport->flags & UPF_HARDPPS_CD) && status) 2436027d7dacSJiri Slaby hardpps(); 2437027d7dacSJiri Slaby #endif 2438027d7dacSJiri Slaby 2439027d7dacSJiri Slaby if (port->flags & ASYNC_CHECK_CD) { 2440027d7dacSJiri Slaby if (status) 2441027d7dacSJiri Slaby wake_up_interruptible(&port->open_wait); 2442027d7dacSJiri Slaby else if (port->tty) 2443027d7dacSJiri Slaby tty_hangup(port->tty); 2444027d7dacSJiri Slaby } 2445027d7dacSJiri Slaby 2446027d7dacSJiri Slaby if (ld && ld->ops->dcd_change) 2447027d7dacSJiri Slaby ld->ops->dcd_change(port->tty, status, &ts); 2448027d7dacSJiri Slaby if (ld) 2449027d7dacSJiri Slaby tty_ldisc_deref(ld); 2450027d7dacSJiri Slaby } 2451027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_handle_dcd_change); 2452027d7dacSJiri Slaby 2453027d7dacSJiri Slaby /** 2454027d7dacSJiri Slaby * uart_handle_cts_change - handle a change of clear-to-send state 2455027d7dacSJiri Slaby * @uport: uart_port structure for the open port 2456027d7dacSJiri Slaby * @status: new clear to send status, nonzero if active 2457027d7dacSJiri Slaby */ 2458027d7dacSJiri Slaby void uart_handle_cts_change(struct uart_port *uport, unsigned int status) 2459027d7dacSJiri Slaby { 2460027d7dacSJiri Slaby struct tty_port *port = &uport->state->port; 2461027d7dacSJiri Slaby struct tty_struct *tty = port->tty; 2462027d7dacSJiri Slaby 2463027d7dacSJiri Slaby uport->icount.cts++; 2464027d7dacSJiri Slaby 2465027d7dacSJiri Slaby if (port->flags & ASYNC_CTS_FLOW) { 2466027d7dacSJiri Slaby if (tty->hw_stopped) { 2467027d7dacSJiri Slaby if (status) { 2468027d7dacSJiri Slaby tty->hw_stopped = 0; 2469027d7dacSJiri Slaby uport->ops->start_tx(uport); 2470027d7dacSJiri Slaby uart_write_wakeup(uport); 2471027d7dacSJiri Slaby } 2472027d7dacSJiri Slaby } else { 2473027d7dacSJiri Slaby if (!status) { 2474027d7dacSJiri Slaby tty->hw_stopped = 1; 2475027d7dacSJiri Slaby uport->ops->stop_tx(uport); 2476027d7dacSJiri Slaby } 2477027d7dacSJiri Slaby } 2478027d7dacSJiri Slaby } 2479027d7dacSJiri Slaby } 2480027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_handle_cts_change); 2481027d7dacSJiri Slaby 2482cf75525fSJiri Slaby /** 2483cf75525fSJiri Slaby * uart_insert_char - push a char to the uart layer 2484cf75525fSJiri Slaby * 2485cf75525fSJiri Slaby * User is responsible to call tty_flip_buffer_push when they are done with 2486cf75525fSJiri Slaby * insertion. 2487cf75525fSJiri Slaby * 2488cf75525fSJiri Slaby * @port: corresponding port 2489cf75525fSJiri Slaby * @status: state of the serial port RX buffer (LSR for 8250) 2490cf75525fSJiri Slaby * @overrun: mask of overrun bits in @status 2491cf75525fSJiri Slaby * @ch: character to push 2492cf75525fSJiri Slaby * @flag: flag for the character (see TTY_NORMAL and friends) 2493cf75525fSJiri Slaby */ 2494027d7dacSJiri Slaby void uart_insert_char(struct uart_port *port, unsigned int status, 2495027d7dacSJiri Slaby unsigned int overrun, unsigned int ch, unsigned int flag) 2496027d7dacSJiri Slaby { 2497027d7dacSJiri Slaby struct tty_struct *tty = port->state->port.tty; 2498027d7dacSJiri Slaby 2499027d7dacSJiri Slaby if ((status & port->ignore_status_mask & ~overrun) == 0) 2500027d7dacSJiri Slaby tty_insert_flip_char(tty, ch, flag); 2501027d7dacSJiri Slaby 2502027d7dacSJiri Slaby /* 2503027d7dacSJiri Slaby * Overrun is special. Since it's reported immediately, 2504027d7dacSJiri Slaby * it doesn't affect the current character. 2505027d7dacSJiri Slaby */ 2506027d7dacSJiri Slaby if (status & ~port->ignore_status_mask & overrun) 2507027d7dacSJiri Slaby tty_insert_flip_char(tty, 0, TTY_OVERRUN); 2508027d7dacSJiri Slaby } 2509027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_insert_char); 2510027d7dacSJiri Slaby 2511ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_write_wakeup); 2512ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_register_driver); 2513ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_unregister_driver); 2514ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_suspend_port); 2515ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_resume_port); 2516ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_add_one_port); 2517ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_remove_one_port); 2518ab4382d2SGreg Kroah-Hartman 2519ab4382d2SGreg Kroah-Hartman MODULE_DESCRIPTION("Serial driver core"); 2520ab4382d2SGreg Kroah-Hartman MODULE_LICENSE("GPL"); 2521