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); 626f538fe3SLinus Walleij static void uart_change_pm(struct uart_state *state, 636f538fe3SLinus Walleij enum uart_pm_state pm_state); 64ab4382d2SGreg Kroah-Hartman 65b922e19dSJiri Slaby static void uart_port_shutdown(struct tty_port *port); 66b922e19dSJiri Slaby 67ab4382d2SGreg Kroah-Hartman /* 68ab4382d2SGreg Kroah-Hartman * This routine is used by the interrupt handler to schedule processing in 69ab4382d2SGreg Kroah-Hartman * the software interrupt portion of the driver. 70ab4382d2SGreg Kroah-Hartman */ 71ab4382d2SGreg Kroah-Hartman void uart_write_wakeup(struct uart_port *port) 72ab4382d2SGreg Kroah-Hartman { 73ab4382d2SGreg Kroah-Hartman struct uart_state *state = port->state; 74ab4382d2SGreg Kroah-Hartman /* 75ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 76ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 77ab4382d2SGreg Kroah-Hartman */ 78ab4382d2SGreg Kroah-Hartman BUG_ON(!state); 796a3e492bSJiri Slaby tty_wakeup(state->port.tty); 80ab4382d2SGreg Kroah-Hartman } 81ab4382d2SGreg Kroah-Hartman 82ab4382d2SGreg Kroah-Hartman static void uart_stop(struct tty_struct *tty) 83ab4382d2SGreg Kroah-Hartman { 84ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 85ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 86ab4382d2SGreg Kroah-Hartman unsigned long flags; 87ab4382d2SGreg Kroah-Hartman 88ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 89ab4382d2SGreg Kroah-Hartman port->ops->stop_tx(port); 90ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 91ab4382d2SGreg Kroah-Hartman } 92ab4382d2SGreg Kroah-Hartman 93ab4382d2SGreg Kroah-Hartman static void __uart_start(struct tty_struct *tty) 94ab4382d2SGreg Kroah-Hartman { 95ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 96ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 97ab4382d2SGreg Kroah-Hartman 98ab4382d2SGreg Kroah-Hartman if (!uart_circ_empty(&state->xmit) && state->xmit.buf && 99ab4382d2SGreg Kroah-Hartman !tty->stopped && !tty->hw_stopped) 100ab4382d2SGreg Kroah-Hartman port->ops->start_tx(port); 101ab4382d2SGreg Kroah-Hartman } 102ab4382d2SGreg Kroah-Hartman 103ab4382d2SGreg Kroah-Hartman static void uart_start(struct tty_struct *tty) 104ab4382d2SGreg Kroah-Hartman { 105ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 106ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 107ab4382d2SGreg Kroah-Hartman unsigned long flags; 108ab4382d2SGreg Kroah-Hartman 109ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 110ab4382d2SGreg Kroah-Hartman __uart_start(tty); 111ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 112ab4382d2SGreg Kroah-Hartman } 113ab4382d2SGreg Kroah-Hartman 114ab4382d2SGreg Kroah-Hartman static inline void 115ab4382d2SGreg Kroah-Hartman uart_update_mctrl(struct uart_port *port, unsigned int set, unsigned int clear) 116ab4382d2SGreg Kroah-Hartman { 117ab4382d2SGreg Kroah-Hartman unsigned long flags; 118ab4382d2SGreg Kroah-Hartman unsigned int old; 119ab4382d2SGreg Kroah-Hartman 120ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 121ab4382d2SGreg Kroah-Hartman old = port->mctrl; 122ab4382d2SGreg Kroah-Hartman port->mctrl = (old & ~clear) | set; 123ab4382d2SGreg Kroah-Hartman if (old != port->mctrl) 124ab4382d2SGreg Kroah-Hartman port->ops->set_mctrl(port, port->mctrl); 125ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 126ab4382d2SGreg Kroah-Hartman } 127ab4382d2SGreg Kroah-Hartman 128ab4382d2SGreg Kroah-Hartman #define uart_set_mctrl(port, set) uart_update_mctrl(port, set, 0) 129ab4382d2SGreg Kroah-Hartman #define uart_clear_mctrl(port, clear) uart_update_mctrl(port, 0, clear) 130ab4382d2SGreg Kroah-Hartman 131ab4382d2SGreg Kroah-Hartman /* 132ab4382d2SGreg Kroah-Hartman * Startup the port. This will be called once per open. All calls 133ab4382d2SGreg Kroah-Hartman * will be serialised by the per-port mutex. 134ab4382d2SGreg Kroah-Hartman */ 135c0d92be6SJiri Slaby static int uart_port_startup(struct tty_struct *tty, struct uart_state *state, 136c0d92be6SJiri Slaby int init_hw) 137ab4382d2SGreg Kroah-Hartman { 138ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 139ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 140ab4382d2SGreg Kroah-Hartman unsigned long page; 141ab4382d2SGreg Kroah-Hartman int retval = 0; 142ab4382d2SGreg Kroah-Hartman 143ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) 144c0d92be6SJiri Slaby return 1; 145ab4382d2SGreg Kroah-Hartman 146ab4382d2SGreg Kroah-Hartman /* 147ab4382d2SGreg Kroah-Hartman * Initialise and allocate the transmit and temporary 148ab4382d2SGreg Kroah-Hartman * buffer. 149ab4382d2SGreg Kroah-Hartman */ 150ab4382d2SGreg Kroah-Hartman if (!state->xmit.buf) { 151ab4382d2SGreg Kroah-Hartman /* This is protected by the per port mutex */ 152ab4382d2SGreg Kroah-Hartman page = get_zeroed_page(GFP_KERNEL); 153ab4382d2SGreg Kroah-Hartman if (!page) 154ab4382d2SGreg Kroah-Hartman return -ENOMEM; 155ab4382d2SGreg Kroah-Hartman 156ab4382d2SGreg Kroah-Hartman state->xmit.buf = (unsigned char *) page; 157ab4382d2SGreg Kroah-Hartman uart_circ_clear(&state->xmit); 158ab4382d2SGreg Kroah-Hartman } 159ab4382d2SGreg Kroah-Hartman 160ab4382d2SGreg Kroah-Hartman retval = uport->ops->startup(uport); 161ab4382d2SGreg Kroah-Hartman if (retval == 0) { 162c7d7abffSJiri Slaby if (uart_console(uport) && uport->cons->cflag) { 163adc8d746SAlan Cox tty->termios.c_cflag = uport->cons->cflag; 164c7d7abffSJiri Slaby uport->cons->cflag = 0; 165c7d7abffSJiri Slaby } 166ab4382d2SGreg Kroah-Hartman /* 167ab4382d2SGreg Kroah-Hartman * Initialise the hardware port settings. 168ab4382d2SGreg Kroah-Hartman */ 169ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 170ab4382d2SGreg Kroah-Hartman 171c7d7abffSJiri Slaby if (init_hw) { 172ab4382d2SGreg Kroah-Hartman /* 173ab4382d2SGreg Kroah-Hartman * Setup the RTS and DTR signals once the 174ab4382d2SGreg Kroah-Hartman * port is open and ready to respond. 175ab4382d2SGreg Kroah-Hartman */ 176adc8d746SAlan Cox if (tty->termios.c_cflag & CBAUD) 177ab4382d2SGreg Kroah-Hartman uart_set_mctrl(uport, TIOCM_RTS | TIOCM_DTR); 178ab4382d2SGreg Kroah-Hartman } 179ab4382d2SGreg Kroah-Hartman 180f21ec3d2SHuang Shijie if (tty_port_cts_enabled(port)) { 181ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 182ab4382d2SGreg Kroah-Hartman if (!(uport->ops->get_mctrl(uport) & TIOCM_CTS)) 183ab4382d2SGreg Kroah-Hartman tty->hw_stopped = 1; 184ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 185ab4382d2SGreg Kroah-Hartman } 186ab4382d2SGreg Kroah-Hartman } 187ab4382d2SGreg Kroah-Hartman 1880055197eSJiri Slaby /* 1890055197eSJiri Slaby * This is to allow setserial on this port. People may want to set 1900055197eSJiri Slaby * port/irq/type and then reconfigure the port properly if it failed 1910055197eSJiri Slaby * now. 1920055197eSJiri Slaby */ 193ab4382d2SGreg Kroah-Hartman if (retval && capable(CAP_SYS_ADMIN)) 194c0d92be6SJiri Slaby return 1; 195c0d92be6SJiri Slaby 196c0d92be6SJiri Slaby return retval; 197c0d92be6SJiri Slaby } 198c0d92be6SJiri Slaby 199c0d92be6SJiri Slaby static int uart_startup(struct tty_struct *tty, struct uart_state *state, 200c0d92be6SJiri Slaby int init_hw) 201c0d92be6SJiri Slaby { 202c0d92be6SJiri Slaby struct tty_port *port = &state->port; 203c0d92be6SJiri Slaby int retval; 204c0d92be6SJiri Slaby 205c0d92be6SJiri Slaby if (port->flags & ASYNC_INITIALIZED) 206c0d92be6SJiri Slaby return 0; 207c0d92be6SJiri Slaby 208c0d92be6SJiri Slaby /* 209c0d92be6SJiri Slaby * Set the TTY IO error marker - we will only clear this 210c0d92be6SJiri Slaby * once we have successfully opened the port. 211c0d92be6SJiri Slaby */ 212c0d92be6SJiri Slaby set_bit(TTY_IO_ERROR, &tty->flags); 213c0d92be6SJiri Slaby 214c0d92be6SJiri Slaby retval = uart_port_startup(tty, state, init_hw); 215c0d92be6SJiri Slaby if (!retval) { 216c0d92be6SJiri Slaby set_bit(ASYNCB_INITIALIZED, &port->flags); 217c0d92be6SJiri Slaby clear_bit(TTY_IO_ERROR, &tty->flags); 218c0d92be6SJiri Slaby } else if (retval > 0) 219ab4382d2SGreg Kroah-Hartman retval = 0; 220ab4382d2SGreg Kroah-Hartman 221ab4382d2SGreg Kroah-Hartman return retval; 222ab4382d2SGreg Kroah-Hartman } 223ab4382d2SGreg Kroah-Hartman 224ab4382d2SGreg Kroah-Hartman /* 225ab4382d2SGreg Kroah-Hartman * This routine will shutdown a serial port; interrupts are disabled, and 226ab4382d2SGreg Kroah-Hartman * DTR is dropped if the hangup on close termio flag is on. Calls to 227ab4382d2SGreg Kroah-Hartman * uart_shutdown are serialised by the per-port semaphore. 228ab4382d2SGreg Kroah-Hartman */ 229ab4382d2SGreg Kroah-Hartman static void uart_shutdown(struct tty_struct *tty, struct uart_state *state) 230ab4382d2SGreg Kroah-Hartman { 231ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 232ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 233ab4382d2SGreg Kroah-Hartman 234ab4382d2SGreg Kroah-Hartman /* 235ab4382d2SGreg Kroah-Hartman * Set the TTY IO error marker 236ab4382d2SGreg Kroah-Hartman */ 237ab4382d2SGreg Kroah-Hartman if (tty) 238ab4382d2SGreg Kroah-Hartman set_bit(TTY_IO_ERROR, &tty->flags); 239ab4382d2SGreg Kroah-Hartman 240ab4382d2SGreg Kroah-Hartman if (test_and_clear_bit(ASYNCB_INITIALIZED, &port->flags)) { 241ab4382d2SGreg Kroah-Hartman /* 242ab4382d2SGreg Kroah-Hartman * Turn off DTR and RTS early. 243ab4382d2SGreg Kroah-Hartman */ 244adc8d746SAlan Cox if (!tty || (tty->termios.c_cflag & HUPCL)) 245ab4382d2SGreg Kroah-Hartman uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); 246ab4382d2SGreg Kroah-Hartman 247b922e19dSJiri Slaby uart_port_shutdown(port); 248ab4382d2SGreg Kroah-Hartman } 249ab4382d2SGreg Kroah-Hartman 250ab4382d2SGreg Kroah-Hartman /* 251d208a3bfSDoug Anderson * It's possible for shutdown to be called after suspend if we get 252d208a3bfSDoug Anderson * a DCD drop (hangup) at just the right time. Clear suspended bit so 253d208a3bfSDoug Anderson * we don't try to resume a port that has been shutdown. 254ab4382d2SGreg Kroah-Hartman */ 255d208a3bfSDoug Anderson clear_bit(ASYNCB_SUSPENDED, &port->flags); 256ab4382d2SGreg Kroah-Hartman 257ab4382d2SGreg Kroah-Hartman /* 258ab4382d2SGreg Kroah-Hartman * Free the transmit buffer page. 259ab4382d2SGreg Kroah-Hartman */ 260ab4382d2SGreg Kroah-Hartman if (state->xmit.buf) { 261ab4382d2SGreg Kroah-Hartman free_page((unsigned long)state->xmit.buf); 262ab4382d2SGreg Kroah-Hartman state->xmit.buf = NULL; 263ab4382d2SGreg Kroah-Hartman } 264ab4382d2SGreg Kroah-Hartman } 265ab4382d2SGreg Kroah-Hartman 266ab4382d2SGreg Kroah-Hartman /** 267ab4382d2SGreg Kroah-Hartman * uart_update_timeout - update per-port FIFO timeout. 268ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port 269ab4382d2SGreg Kroah-Hartman * @cflag: termios cflag value 270ab4382d2SGreg Kroah-Hartman * @baud: speed of the port 271ab4382d2SGreg Kroah-Hartman * 272ab4382d2SGreg Kroah-Hartman * Set the port FIFO timeout value. The @cflag value should 273ab4382d2SGreg Kroah-Hartman * reflect the actual hardware settings. 274ab4382d2SGreg Kroah-Hartman */ 275ab4382d2SGreg Kroah-Hartman void 276ab4382d2SGreg Kroah-Hartman uart_update_timeout(struct uart_port *port, unsigned int cflag, 277ab4382d2SGreg Kroah-Hartman unsigned int baud) 278ab4382d2SGreg Kroah-Hartman { 279ab4382d2SGreg Kroah-Hartman unsigned int bits; 280ab4382d2SGreg Kroah-Hartman 281ab4382d2SGreg Kroah-Hartman /* byte size and parity */ 282ab4382d2SGreg Kroah-Hartman switch (cflag & CSIZE) { 283ab4382d2SGreg Kroah-Hartman case CS5: 284ab4382d2SGreg Kroah-Hartman bits = 7; 285ab4382d2SGreg Kroah-Hartman break; 286ab4382d2SGreg Kroah-Hartman case CS6: 287ab4382d2SGreg Kroah-Hartman bits = 8; 288ab4382d2SGreg Kroah-Hartman break; 289ab4382d2SGreg Kroah-Hartman case CS7: 290ab4382d2SGreg Kroah-Hartman bits = 9; 291ab4382d2SGreg Kroah-Hartman break; 292ab4382d2SGreg Kroah-Hartman default: 293ab4382d2SGreg Kroah-Hartman bits = 10; 294ab4382d2SGreg Kroah-Hartman break; /* CS8 */ 295ab4382d2SGreg Kroah-Hartman } 296ab4382d2SGreg Kroah-Hartman 297ab4382d2SGreg Kroah-Hartman if (cflag & CSTOPB) 298ab4382d2SGreg Kroah-Hartman bits++; 299ab4382d2SGreg Kroah-Hartman if (cflag & PARENB) 300ab4382d2SGreg Kroah-Hartman bits++; 301ab4382d2SGreg Kroah-Hartman 302ab4382d2SGreg Kroah-Hartman /* 303ab4382d2SGreg Kroah-Hartman * The total number of bits to be transmitted in the fifo. 304ab4382d2SGreg Kroah-Hartman */ 305ab4382d2SGreg Kroah-Hartman bits = bits * port->fifosize; 306ab4382d2SGreg Kroah-Hartman 307ab4382d2SGreg Kroah-Hartman /* 308ab4382d2SGreg Kroah-Hartman * Figure the timeout to send the above number of bits. 309ab4382d2SGreg Kroah-Hartman * Add .02 seconds of slop 310ab4382d2SGreg Kroah-Hartman */ 311ab4382d2SGreg Kroah-Hartman port->timeout = (HZ * bits) / baud + HZ/50; 312ab4382d2SGreg Kroah-Hartman } 313ab4382d2SGreg Kroah-Hartman 314ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_update_timeout); 315ab4382d2SGreg Kroah-Hartman 316ab4382d2SGreg Kroah-Hartman /** 317ab4382d2SGreg Kroah-Hartman * uart_get_baud_rate - return baud rate for a particular port 318ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port in question. 319ab4382d2SGreg Kroah-Hartman * @termios: desired termios settings. 320ab4382d2SGreg Kroah-Hartman * @old: old termios (or NULL) 321ab4382d2SGreg Kroah-Hartman * @min: minimum acceptable baud rate 322ab4382d2SGreg Kroah-Hartman * @max: maximum acceptable baud rate 323ab4382d2SGreg Kroah-Hartman * 324ab4382d2SGreg Kroah-Hartman * Decode the termios structure into a numeric baud rate, 325ab4382d2SGreg Kroah-Hartman * taking account of the magic 38400 baud rate (with spd_* 326ab4382d2SGreg Kroah-Hartman * flags), and mapping the %B0 rate to 9600 baud. 327ab4382d2SGreg Kroah-Hartman * 328ab4382d2SGreg Kroah-Hartman * If the new baud rate is invalid, try the old termios setting. 329ab4382d2SGreg Kroah-Hartman * If it's still invalid, we try 9600 baud. 330ab4382d2SGreg Kroah-Hartman * 331ab4382d2SGreg Kroah-Hartman * Update the @termios structure to reflect the baud rate 332ab4382d2SGreg Kroah-Hartman * we're actually going to be using. Don't do this for the case 333ab4382d2SGreg Kroah-Hartman * where B0 is requested ("hang up"). 334ab4382d2SGreg Kroah-Hartman */ 335ab4382d2SGreg Kroah-Hartman unsigned int 336ab4382d2SGreg Kroah-Hartman uart_get_baud_rate(struct uart_port *port, struct ktermios *termios, 337ab4382d2SGreg Kroah-Hartman struct ktermios *old, unsigned int min, unsigned int max) 338ab4382d2SGreg Kroah-Hartman { 339ab4382d2SGreg Kroah-Hartman unsigned int try, baud, altbaud = 38400; 340ab4382d2SGreg Kroah-Hartman int hung_up = 0; 341ab4382d2SGreg Kroah-Hartman upf_t flags = port->flags & UPF_SPD_MASK; 342ab4382d2SGreg Kroah-Hartman 343ab4382d2SGreg Kroah-Hartman if (flags == UPF_SPD_HI) 344ab4382d2SGreg Kroah-Hartman altbaud = 57600; 345ab4382d2SGreg Kroah-Hartman else if (flags == UPF_SPD_VHI) 346ab4382d2SGreg Kroah-Hartman altbaud = 115200; 347ab4382d2SGreg Kroah-Hartman else if (flags == UPF_SPD_SHI) 348ab4382d2SGreg Kroah-Hartman altbaud = 230400; 349ab4382d2SGreg Kroah-Hartman else if (flags == UPF_SPD_WARP) 350ab4382d2SGreg Kroah-Hartman altbaud = 460800; 351ab4382d2SGreg Kroah-Hartman 352ab4382d2SGreg Kroah-Hartman for (try = 0; try < 2; try++) { 353ab4382d2SGreg Kroah-Hartman baud = tty_termios_baud_rate(termios); 354ab4382d2SGreg Kroah-Hartman 355ab4382d2SGreg Kroah-Hartman /* 356ab4382d2SGreg Kroah-Hartman * The spd_hi, spd_vhi, spd_shi, spd_warp kludge... 357ab4382d2SGreg Kroah-Hartman * Die! Die! Die! 358ab4382d2SGreg Kroah-Hartman */ 359ab4382d2SGreg Kroah-Hartman if (baud == 38400) 360ab4382d2SGreg Kroah-Hartman baud = altbaud; 361ab4382d2SGreg Kroah-Hartman 362ab4382d2SGreg Kroah-Hartman /* 363ab4382d2SGreg Kroah-Hartman * Special case: B0 rate. 364ab4382d2SGreg Kroah-Hartman */ 365ab4382d2SGreg Kroah-Hartman if (baud == 0) { 366ab4382d2SGreg Kroah-Hartman hung_up = 1; 367ab4382d2SGreg Kroah-Hartman baud = 9600; 368ab4382d2SGreg Kroah-Hartman } 369ab4382d2SGreg Kroah-Hartman 370ab4382d2SGreg Kroah-Hartman if (baud >= min && baud <= max) 371ab4382d2SGreg Kroah-Hartman return baud; 372ab4382d2SGreg Kroah-Hartman 373ab4382d2SGreg Kroah-Hartman /* 374ab4382d2SGreg Kroah-Hartman * Oops, the quotient was zero. Try again with 375ab4382d2SGreg Kroah-Hartman * the old baud rate if possible. 376ab4382d2SGreg Kroah-Hartman */ 377ab4382d2SGreg Kroah-Hartman termios->c_cflag &= ~CBAUD; 378ab4382d2SGreg Kroah-Hartman if (old) { 379ab4382d2SGreg Kroah-Hartman baud = tty_termios_baud_rate(old); 380ab4382d2SGreg Kroah-Hartman if (!hung_up) 381ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 382ab4382d2SGreg Kroah-Hartman baud, baud); 383ab4382d2SGreg Kroah-Hartman old = NULL; 384ab4382d2SGreg Kroah-Hartman continue; 385ab4382d2SGreg Kroah-Hartman } 386ab4382d2SGreg Kroah-Hartman 387ab4382d2SGreg Kroah-Hartman /* 388ab4382d2SGreg Kroah-Hartman * As a last resort, if the range cannot be met then clip to 389ab4382d2SGreg Kroah-Hartman * the nearest chip supported rate. 390ab4382d2SGreg Kroah-Hartman */ 391ab4382d2SGreg Kroah-Hartman if (!hung_up) { 392ab4382d2SGreg Kroah-Hartman if (baud <= min) 393ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 394ab4382d2SGreg Kroah-Hartman min + 1, min + 1); 395ab4382d2SGreg Kroah-Hartman else 396ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 397ab4382d2SGreg Kroah-Hartman max - 1, max - 1); 398ab4382d2SGreg Kroah-Hartman } 399ab4382d2SGreg Kroah-Hartman } 400ab4382d2SGreg Kroah-Hartman /* Should never happen */ 401ab4382d2SGreg Kroah-Hartman WARN_ON(1); 402ab4382d2SGreg Kroah-Hartman return 0; 403ab4382d2SGreg Kroah-Hartman } 404ab4382d2SGreg Kroah-Hartman 405ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_get_baud_rate); 406ab4382d2SGreg Kroah-Hartman 407ab4382d2SGreg Kroah-Hartman /** 408ab4382d2SGreg Kroah-Hartman * uart_get_divisor - return uart clock divisor 409ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port. 410ab4382d2SGreg Kroah-Hartman * @baud: desired baud rate 411ab4382d2SGreg Kroah-Hartman * 412ab4382d2SGreg Kroah-Hartman * Calculate the uart clock divisor for the port. 413ab4382d2SGreg Kroah-Hartman */ 414ab4382d2SGreg Kroah-Hartman unsigned int 415ab4382d2SGreg Kroah-Hartman uart_get_divisor(struct uart_port *port, unsigned int baud) 416ab4382d2SGreg Kroah-Hartman { 417ab4382d2SGreg Kroah-Hartman unsigned int quot; 418ab4382d2SGreg Kroah-Hartman 419ab4382d2SGreg Kroah-Hartman /* 420ab4382d2SGreg Kroah-Hartman * Old custom speed handling. 421ab4382d2SGreg Kroah-Hartman */ 422ab4382d2SGreg Kroah-Hartman if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) 423ab4382d2SGreg Kroah-Hartman quot = port->custom_divisor; 424ab4382d2SGreg Kroah-Hartman else 42597d24634SUwe Kleine-König quot = DIV_ROUND_CLOSEST(port->uartclk, 16 * baud); 426ab4382d2SGreg Kroah-Hartman 427ab4382d2SGreg Kroah-Hartman return quot; 428ab4382d2SGreg Kroah-Hartman } 429ab4382d2SGreg Kroah-Hartman 430ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_get_divisor); 431ab4382d2SGreg Kroah-Hartman 432ab4382d2SGreg Kroah-Hartman /* FIXME: Consistent locking policy */ 433ab4382d2SGreg Kroah-Hartman static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, 434ab4382d2SGreg Kroah-Hartman struct ktermios *old_termios) 435ab4382d2SGreg Kroah-Hartman { 436ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 437ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 438ab4382d2SGreg Kroah-Hartman struct ktermios *termios; 439ab4382d2SGreg Kroah-Hartman 440ab4382d2SGreg Kroah-Hartman /* 441ab4382d2SGreg Kroah-Hartman * If we have no tty, termios, or the port does not exist, 442ab4382d2SGreg Kroah-Hartman * then we can't set the parameters for this port. 443ab4382d2SGreg Kroah-Hartman */ 444adc8d746SAlan Cox if (!tty || uport->type == PORT_UNKNOWN) 445ab4382d2SGreg Kroah-Hartman return; 446ab4382d2SGreg Kroah-Hartman 447adc8d746SAlan Cox termios = &tty->termios; 448ab4382d2SGreg Kroah-Hartman 449ab4382d2SGreg Kroah-Hartman /* 450ab4382d2SGreg Kroah-Hartman * Set flags based on termios cflag 451ab4382d2SGreg Kroah-Hartman */ 452ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CRTSCTS) 453ab4382d2SGreg Kroah-Hartman set_bit(ASYNCB_CTS_FLOW, &port->flags); 454ab4382d2SGreg Kroah-Hartman else 455ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_CTS_FLOW, &port->flags); 456ab4382d2SGreg Kroah-Hartman 457ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CLOCAL) 458ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_CHECK_CD, &port->flags); 459ab4382d2SGreg Kroah-Hartman else 460ab4382d2SGreg Kroah-Hartman set_bit(ASYNCB_CHECK_CD, &port->flags); 461ab4382d2SGreg Kroah-Hartman 462ab4382d2SGreg Kroah-Hartman uport->ops->set_termios(uport, termios, old_termios); 463ab4382d2SGreg Kroah-Hartman } 464ab4382d2SGreg Kroah-Hartman 465ab4382d2SGreg Kroah-Hartman static inline int __uart_put_char(struct uart_port *port, 466ab4382d2SGreg Kroah-Hartman struct circ_buf *circ, unsigned char c) 467ab4382d2SGreg Kroah-Hartman { 468ab4382d2SGreg Kroah-Hartman unsigned long flags; 469ab4382d2SGreg Kroah-Hartman int ret = 0; 470ab4382d2SGreg Kroah-Hartman 471ab4382d2SGreg Kroah-Hartman if (!circ->buf) 472ab4382d2SGreg Kroah-Hartman return 0; 473ab4382d2SGreg Kroah-Hartman 474ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 475ab4382d2SGreg Kroah-Hartman if (uart_circ_chars_free(circ) != 0) { 476ab4382d2SGreg Kroah-Hartman circ->buf[circ->head] = c; 477ab4382d2SGreg Kroah-Hartman circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1); 478ab4382d2SGreg Kroah-Hartman ret = 1; 479ab4382d2SGreg Kroah-Hartman } 480ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 481ab4382d2SGreg Kroah-Hartman return ret; 482ab4382d2SGreg Kroah-Hartman } 483ab4382d2SGreg Kroah-Hartman 484ab4382d2SGreg Kroah-Hartman static int uart_put_char(struct tty_struct *tty, unsigned char ch) 485ab4382d2SGreg Kroah-Hartman { 486ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 487ab4382d2SGreg Kroah-Hartman 488ab4382d2SGreg Kroah-Hartman return __uart_put_char(state->uart_port, &state->xmit, ch); 489ab4382d2SGreg Kroah-Hartman } 490ab4382d2SGreg Kroah-Hartman 491ab4382d2SGreg Kroah-Hartman static void uart_flush_chars(struct tty_struct *tty) 492ab4382d2SGreg Kroah-Hartman { 493ab4382d2SGreg Kroah-Hartman uart_start(tty); 494ab4382d2SGreg Kroah-Hartman } 495ab4382d2SGreg Kroah-Hartman 496ab4382d2SGreg Kroah-Hartman static int uart_write(struct tty_struct *tty, 497ab4382d2SGreg Kroah-Hartman const unsigned char *buf, int count) 498ab4382d2SGreg Kroah-Hartman { 499ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 500ab4382d2SGreg Kroah-Hartman struct uart_port *port; 501ab4382d2SGreg Kroah-Hartman struct circ_buf *circ; 502ab4382d2SGreg Kroah-Hartman unsigned long flags; 503ab4382d2SGreg Kroah-Hartman int c, ret = 0; 504ab4382d2SGreg Kroah-Hartman 505ab4382d2SGreg Kroah-Hartman /* 506ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 507ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 508ab4382d2SGreg Kroah-Hartman */ 509ab4382d2SGreg Kroah-Hartman if (!state) { 510ab4382d2SGreg Kroah-Hartman WARN_ON(1); 511ab4382d2SGreg Kroah-Hartman return -EL3HLT; 512ab4382d2SGreg Kroah-Hartman } 513ab4382d2SGreg Kroah-Hartman 514ab4382d2SGreg Kroah-Hartman port = state->uart_port; 515ab4382d2SGreg Kroah-Hartman circ = &state->xmit; 516ab4382d2SGreg Kroah-Hartman 517ab4382d2SGreg Kroah-Hartman if (!circ->buf) 518ab4382d2SGreg Kroah-Hartman return 0; 519ab4382d2SGreg Kroah-Hartman 520ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 521ab4382d2SGreg Kroah-Hartman while (1) { 522ab4382d2SGreg Kroah-Hartman c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE); 523ab4382d2SGreg Kroah-Hartman if (count < c) 524ab4382d2SGreg Kroah-Hartman c = count; 525ab4382d2SGreg Kroah-Hartman if (c <= 0) 526ab4382d2SGreg Kroah-Hartman break; 527ab4382d2SGreg Kroah-Hartman memcpy(circ->buf + circ->head, buf, c); 528ab4382d2SGreg Kroah-Hartman circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1); 529ab4382d2SGreg Kroah-Hartman buf += c; 530ab4382d2SGreg Kroah-Hartman count -= c; 531ab4382d2SGreg Kroah-Hartman ret += c; 532ab4382d2SGreg Kroah-Hartman } 533ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 534ab4382d2SGreg Kroah-Hartman 535ab4382d2SGreg Kroah-Hartman uart_start(tty); 536ab4382d2SGreg Kroah-Hartman return ret; 537ab4382d2SGreg Kroah-Hartman } 538ab4382d2SGreg Kroah-Hartman 539ab4382d2SGreg Kroah-Hartman static int uart_write_room(struct tty_struct *tty) 540ab4382d2SGreg Kroah-Hartman { 541ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 542ab4382d2SGreg Kroah-Hartman unsigned long flags; 543ab4382d2SGreg Kroah-Hartman int ret; 544ab4382d2SGreg Kroah-Hartman 545ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&state->uart_port->lock, flags); 546ab4382d2SGreg Kroah-Hartman ret = uart_circ_chars_free(&state->xmit); 547ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&state->uart_port->lock, flags); 548ab4382d2SGreg Kroah-Hartman return ret; 549ab4382d2SGreg Kroah-Hartman } 550ab4382d2SGreg Kroah-Hartman 551ab4382d2SGreg Kroah-Hartman static int uart_chars_in_buffer(struct tty_struct *tty) 552ab4382d2SGreg Kroah-Hartman { 553ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 554ab4382d2SGreg Kroah-Hartman unsigned long flags; 555ab4382d2SGreg Kroah-Hartman int ret; 556ab4382d2SGreg Kroah-Hartman 557ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&state->uart_port->lock, flags); 558ab4382d2SGreg Kroah-Hartman ret = uart_circ_chars_pending(&state->xmit); 559ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&state->uart_port->lock, flags); 560ab4382d2SGreg Kroah-Hartman return ret; 561ab4382d2SGreg Kroah-Hartman } 562ab4382d2SGreg Kroah-Hartman 563ab4382d2SGreg Kroah-Hartman static void uart_flush_buffer(struct tty_struct *tty) 564ab4382d2SGreg Kroah-Hartman { 565ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 566ab4382d2SGreg Kroah-Hartman struct uart_port *port; 567ab4382d2SGreg Kroah-Hartman unsigned long flags; 568ab4382d2SGreg Kroah-Hartman 569ab4382d2SGreg Kroah-Hartman /* 570ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 571ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 572ab4382d2SGreg Kroah-Hartman */ 573ab4382d2SGreg Kroah-Hartman if (!state) { 574ab4382d2SGreg Kroah-Hartman WARN_ON(1); 575ab4382d2SGreg Kroah-Hartman return; 576ab4382d2SGreg Kroah-Hartman } 577ab4382d2SGreg Kroah-Hartman 578ab4382d2SGreg Kroah-Hartman port = state->uart_port; 579ab4382d2SGreg Kroah-Hartman pr_debug("uart_flush_buffer(%d) called\n", tty->index); 580ab4382d2SGreg Kroah-Hartman 581ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 582ab4382d2SGreg Kroah-Hartman uart_circ_clear(&state->xmit); 583ab4382d2SGreg Kroah-Hartman if (port->ops->flush_buffer) 584ab4382d2SGreg Kroah-Hartman port->ops->flush_buffer(port); 585ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 586ab4382d2SGreg Kroah-Hartman tty_wakeup(tty); 587ab4382d2SGreg Kroah-Hartman } 588ab4382d2SGreg Kroah-Hartman 589ab4382d2SGreg Kroah-Hartman /* 590ab4382d2SGreg Kroah-Hartman * This function is used to send a high-priority XON/XOFF character to 591ab4382d2SGreg Kroah-Hartman * the device 592ab4382d2SGreg Kroah-Hartman */ 593ab4382d2SGreg Kroah-Hartman static void uart_send_xchar(struct tty_struct *tty, char ch) 594ab4382d2SGreg Kroah-Hartman { 595ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 596ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 597ab4382d2SGreg Kroah-Hartman unsigned long flags; 598ab4382d2SGreg Kroah-Hartman 599ab4382d2SGreg Kroah-Hartman if (port->ops->send_xchar) 600ab4382d2SGreg Kroah-Hartman port->ops->send_xchar(port, ch); 601ab4382d2SGreg Kroah-Hartman else { 602ab4382d2SGreg Kroah-Hartman port->x_char = ch; 603ab4382d2SGreg Kroah-Hartman if (ch) { 604ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 605ab4382d2SGreg Kroah-Hartman port->ops->start_tx(port); 606ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 607ab4382d2SGreg Kroah-Hartman } 608ab4382d2SGreg Kroah-Hartman } 609ab4382d2SGreg Kroah-Hartman } 610ab4382d2SGreg Kroah-Hartman 611ab4382d2SGreg Kroah-Hartman static void uart_throttle(struct tty_struct *tty) 612ab4382d2SGreg Kroah-Hartman { 613ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 6149aba8d5bSRussell King struct uart_port *port = state->uart_port; 6159aba8d5bSRussell King uint32_t mask = 0; 616ab4382d2SGreg Kroah-Hartman 617ab4382d2SGreg Kroah-Hartman if (I_IXOFF(tty)) 6189aba8d5bSRussell King mask |= UPF_SOFT_FLOW; 6199aba8d5bSRussell King if (tty->termios.c_cflag & CRTSCTS) 6209aba8d5bSRussell King mask |= UPF_HARD_FLOW; 6219aba8d5bSRussell King 6229aba8d5bSRussell King if (port->flags & mask) { 6239aba8d5bSRussell King port->ops->throttle(port); 6249aba8d5bSRussell King mask &= ~port->flags; 6259aba8d5bSRussell King } 6269aba8d5bSRussell King 6279aba8d5bSRussell King if (mask & UPF_SOFT_FLOW) 628ab4382d2SGreg Kroah-Hartman uart_send_xchar(tty, STOP_CHAR(tty)); 629ab4382d2SGreg Kroah-Hartman 6309aba8d5bSRussell King if (mask & UPF_HARD_FLOW) 6319aba8d5bSRussell King uart_clear_mctrl(port, TIOCM_RTS); 632ab4382d2SGreg Kroah-Hartman } 633ab4382d2SGreg Kroah-Hartman 634ab4382d2SGreg Kroah-Hartman static void uart_unthrottle(struct tty_struct *tty) 635ab4382d2SGreg Kroah-Hartman { 636ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 637ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 6389aba8d5bSRussell King uint32_t mask = 0; 639ab4382d2SGreg Kroah-Hartman 6409aba8d5bSRussell King if (I_IXOFF(tty)) 6419aba8d5bSRussell King mask |= UPF_SOFT_FLOW; 6429aba8d5bSRussell King if (tty->termios.c_cflag & CRTSCTS) 6439aba8d5bSRussell King mask |= UPF_HARD_FLOW; 6449aba8d5bSRussell King 6459aba8d5bSRussell King if (port->flags & mask) { 6469aba8d5bSRussell King port->ops->unthrottle(port); 6479aba8d5bSRussell King mask &= ~port->flags; 6489aba8d5bSRussell King } 6499aba8d5bSRussell King 6509aba8d5bSRussell King if (mask & UPF_SOFT_FLOW) { 651ab4382d2SGreg Kroah-Hartman if (port->x_char) 652ab4382d2SGreg Kroah-Hartman port->x_char = 0; 653ab4382d2SGreg Kroah-Hartman else 654ab4382d2SGreg Kroah-Hartman uart_send_xchar(tty, START_CHAR(tty)); 655ab4382d2SGreg Kroah-Hartman } 656ab4382d2SGreg Kroah-Hartman 6579aba8d5bSRussell King if (mask & UPF_HARD_FLOW) 658ab4382d2SGreg Kroah-Hartman uart_set_mctrl(port, TIOCM_RTS); 659ab4382d2SGreg Kroah-Hartman } 660ab4382d2SGreg Kroah-Hartman 6619f109694SAlan Cox static void do_uart_get_info(struct tty_port *port, 6627ba2e769SAlan Cox struct serial_struct *retinfo) 663ab4382d2SGreg Kroah-Hartman { 6649f109694SAlan Cox struct uart_state *state = container_of(port, struct uart_state, port); 665ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 6667ba2e769SAlan Cox 66737cd0c99SFengguang Wu memset(retinfo, 0, sizeof(*retinfo)); 6687ba2e769SAlan Cox 6697ba2e769SAlan Cox retinfo->type = uport->type; 6707ba2e769SAlan Cox retinfo->line = uport->line; 6717ba2e769SAlan Cox retinfo->port = uport->iobase; 6727ba2e769SAlan Cox if (HIGH_BITS_OFFSET) 6737ba2e769SAlan Cox retinfo->port_high = (long) uport->iobase >> HIGH_BITS_OFFSET; 6747ba2e769SAlan Cox retinfo->irq = uport->irq; 6757ba2e769SAlan Cox retinfo->flags = uport->flags; 6767ba2e769SAlan Cox retinfo->xmit_fifo_size = uport->fifosize; 6777ba2e769SAlan Cox retinfo->baud_base = uport->uartclk / 16; 6787ba2e769SAlan Cox retinfo->close_delay = jiffies_to_msecs(port->close_delay) / 10; 6797ba2e769SAlan Cox retinfo->closing_wait = port->closing_wait == ASYNC_CLOSING_WAIT_NONE ? 6807ba2e769SAlan Cox ASYNC_CLOSING_WAIT_NONE : 6817ba2e769SAlan Cox jiffies_to_msecs(port->closing_wait) / 10; 6827ba2e769SAlan Cox retinfo->custom_divisor = uport->custom_divisor; 6837ba2e769SAlan Cox retinfo->hub6 = uport->hub6; 6847ba2e769SAlan Cox retinfo->io_type = uport->iotype; 6857ba2e769SAlan Cox retinfo->iomem_reg_shift = uport->regshift; 6867ba2e769SAlan Cox retinfo->iomem_base = (void *)(unsigned long)uport->mapbase; 6877ba2e769SAlan Cox } 6887ba2e769SAlan Cox 6899f109694SAlan Cox static void uart_get_info(struct tty_port *port, 6909f109694SAlan Cox struct serial_struct *retinfo) 6917ba2e769SAlan Cox { 692ab4382d2SGreg Kroah-Hartman /* Ensure the state we copy is consistent and no hardware changes 693ab4382d2SGreg Kroah-Hartman occur as we go */ 694ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 6959f109694SAlan Cox do_uart_get_info(port, retinfo); 696ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 6979f109694SAlan Cox } 6989f109694SAlan Cox 6999f109694SAlan Cox static int uart_get_info_user(struct tty_port *port, 7009f109694SAlan Cox struct serial_struct __user *retinfo) 7019f109694SAlan Cox { 7029f109694SAlan Cox struct serial_struct tmp; 7039f109694SAlan Cox uart_get_info(port, &tmp); 704ab4382d2SGreg Kroah-Hartman 705ab4382d2SGreg Kroah-Hartman if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) 706ab4382d2SGreg Kroah-Hartman return -EFAULT; 707ab4382d2SGreg Kroah-Hartman return 0; 708ab4382d2SGreg Kroah-Hartman } 709ab4382d2SGreg Kroah-Hartman 7107ba2e769SAlan Cox static int uart_set_info(struct tty_struct *tty, struct tty_port *port, 7117ba2e769SAlan Cox struct uart_state *state, 7127ba2e769SAlan Cox struct serial_struct *new_info) 713ab4382d2SGreg Kroah-Hartman { 714ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 715ab4382d2SGreg Kroah-Hartman unsigned long new_port; 716ab4382d2SGreg Kroah-Hartman unsigned int change_irq, change_port, closing_wait; 717ab4382d2SGreg Kroah-Hartman unsigned int old_custom_divisor, close_delay; 718ab4382d2SGreg Kroah-Hartman upf_t old_flags, new_flags; 719ab4382d2SGreg Kroah-Hartman int retval = 0; 720ab4382d2SGreg Kroah-Hartman 7217ba2e769SAlan Cox new_port = new_info->port; 722ab4382d2SGreg Kroah-Hartman if (HIGH_BITS_OFFSET) 7237ba2e769SAlan Cox new_port += (unsigned long) new_info->port_high << HIGH_BITS_OFFSET; 724ab4382d2SGreg Kroah-Hartman 7257ba2e769SAlan Cox new_info->irq = irq_canonicalize(new_info->irq); 7267ba2e769SAlan Cox close_delay = msecs_to_jiffies(new_info->close_delay * 10); 7277ba2e769SAlan Cox closing_wait = new_info->closing_wait == ASYNC_CLOSING_WAIT_NONE ? 7284cb0fbfdSJiri Slaby ASYNC_CLOSING_WAIT_NONE : 7297ba2e769SAlan Cox msecs_to_jiffies(new_info->closing_wait * 10); 730ab4382d2SGreg Kroah-Hartman 731ab4382d2SGreg Kroah-Hartman 732ab4382d2SGreg Kroah-Hartman change_irq = !(uport->flags & UPF_FIXED_PORT) 7337ba2e769SAlan Cox && new_info->irq != uport->irq; 734ab4382d2SGreg Kroah-Hartman 735ab4382d2SGreg Kroah-Hartman /* 736ab4382d2SGreg Kroah-Hartman * Since changing the 'type' of the port changes its resource 737ab4382d2SGreg Kroah-Hartman * allocations, we should treat type changes the same as 738ab4382d2SGreg Kroah-Hartman * IO port changes. 739ab4382d2SGreg Kroah-Hartman */ 740ab4382d2SGreg Kroah-Hartman change_port = !(uport->flags & UPF_FIXED_PORT) 741ab4382d2SGreg Kroah-Hartman && (new_port != uport->iobase || 7427ba2e769SAlan Cox (unsigned long)new_info->iomem_base != uport->mapbase || 7437ba2e769SAlan Cox new_info->hub6 != uport->hub6 || 7447ba2e769SAlan Cox new_info->io_type != uport->iotype || 7457ba2e769SAlan Cox new_info->iomem_reg_shift != uport->regshift || 7467ba2e769SAlan Cox new_info->type != uport->type); 747ab4382d2SGreg Kroah-Hartman 748ab4382d2SGreg Kroah-Hartman old_flags = uport->flags; 7497ba2e769SAlan Cox new_flags = new_info->flags; 750ab4382d2SGreg Kroah-Hartman old_custom_divisor = uport->custom_divisor; 751ab4382d2SGreg Kroah-Hartman 752ab4382d2SGreg Kroah-Hartman if (!capable(CAP_SYS_ADMIN)) { 753ab4382d2SGreg Kroah-Hartman retval = -EPERM; 754ab4382d2SGreg Kroah-Hartman if (change_irq || change_port || 7557ba2e769SAlan Cox (new_info->baud_base != uport->uartclk / 16) || 756ab4382d2SGreg Kroah-Hartman (close_delay != port->close_delay) || 757ab4382d2SGreg Kroah-Hartman (closing_wait != port->closing_wait) || 7587ba2e769SAlan Cox (new_info->xmit_fifo_size && 7597ba2e769SAlan Cox new_info->xmit_fifo_size != uport->fifosize) || 760ab4382d2SGreg Kroah-Hartman (((new_flags ^ old_flags) & ~UPF_USR_MASK) != 0)) 761ab4382d2SGreg Kroah-Hartman goto exit; 762ab4382d2SGreg Kroah-Hartman uport->flags = ((uport->flags & ~UPF_USR_MASK) | 763ab4382d2SGreg Kroah-Hartman (new_flags & UPF_USR_MASK)); 7647ba2e769SAlan Cox uport->custom_divisor = new_info->custom_divisor; 765ab4382d2SGreg Kroah-Hartman goto check_and_exit; 766ab4382d2SGreg Kroah-Hartman } 767ab4382d2SGreg Kroah-Hartman 768ab4382d2SGreg Kroah-Hartman /* 769ab4382d2SGreg Kroah-Hartman * Ask the low level driver to verify the settings. 770ab4382d2SGreg Kroah-Hartman */ 771ab4382d2SGreg Kroah-Hartman if (uport->ops->verify_port) 7727ba2e769SAlan Cox retval = uport->ops->verify_port(uport, new_info); 773ab4382d2SGreg Kroah-Hartman 7747ba2e769SAlan Cox if ((new_info->irq >= nr_irqs) || (new_info->irq < 0) || 7757ba2e769SAlan Cox (new_info->baud_base < 9600)) 776ab4382d2SGreg Kroah-Hartman retval = -EINVAL; 777ab4382d2SGreg Kroah-Hartman 778ab4382d2SGreg Kroah-Hartman if (retval) 779ab4382d2SGreg Kroah-Hartman goto exit; 780ab4382d2SGreg Kroah-Hartman 781ab4382d2SGreg Kroah-Hartman if (change_port || change_irq) { 782ab4382d2SGreg Kroah-Hartman retval = -EBUSY; 783ab4382d2SGreg Kroah-Hartman 784ab4382d2SGreg Kroah-Hartman /* 785ab4382d2SGreg Kroah-Hartman * Make sure that we are the sole user of this port. 786ab4382d2SGreg Kroah-Hartman */ 787ab4382d2SGreg Kroah-Hartman if (tty_port_users(port) > 1) 788ab4382d2SGreg Kroah-Hartman goto exit; 789ab4382d2SGreg Kroah-Hartman 790ab4382d2SGreg Kroah-Hartman /* 791ab4382d2SGreg Kroah-Hartman * We need to shutdown the serial port at the old 792ab4382d2SGreg Kroah-Hartman * port/type/irq combination. 793ab4382d2SGreg Kroah-Hartman */ 794ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 795ab4382d2SGreg Kroah-Hartman } 796ab4382d2SGreg Kroah-Hartman 797ab4382d2SGreg Kroah-Hartman if (change_port) { 798ab4382d2SGreg Kroah-Hartman unsigned long old_iobase, old_mapbase; 799ab4382d2SGreg Kroah-Hartman unsigned int old_type, old_iotype, old_hub6, old_shift; 800ab4382d2SGreg Kroah-Hartman 801ab4382d2SGreg Kroah-Hartman old_iobase = uport->iobase; 802ab4382d2SGreg Kroah-Hartman old_mapbase = uport->mapbase; 803ab4382d2SGreg Kroah-Hartman old_type = uport->type; 804ab4382d2SGreg Kroah-Hartman old_hub6 = uport->hub6; 805ab4382d2SGreg Kroah-Hartman old_iotype = uport->iotype; 806ab4382d2SGreg Kroah-Hartman old_shift = uport->regshift; 807ab4382d2SGreg Kroah-Hartman 808ab4382d2SGreg Kroah-Hartman /* 809ab4382d2SGreg Kroah-Hartman * Free and release old regions 810ab4382d2SGreg Kroah-Hartman */ 811ab4382d2SGreg Kroah-Hartman if (old_type != PORT_UNKNOWN) 812ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 813ab4382d2SGreg Kroah-Hartman 814ab4382d2SGreg Kroah-Hartman uport->iobase = new_port; 8157ba2e769SAlan Cox uport->type = new_info->type; 8167ba2e769SAlan Cox uport->hub6 = new_info->hub6; 8177ba2e769SAlan Cox uport->iotype = new_info->io_type; 8187ba2e769SAlan Cox uport->regshift = new_info->iomem_reg_shift; 8197ba2e769SAlan Cox uport->mapbase = (unsigned long)new_info->iomem_base; 820ab4382d2SGreg Kroah-Hartman 821ab4382d2SGreg Kroah-Hartman /* 822ab4382d2SGreg Kroah-Hartman * Claim and map the new regions 823ab4382d2SGreg Kroah-Hartman */ 824ab4382d2SGreg Kroah-Hartman if (uport->type != PORT_UNKNOWN) { 825ab4382d2SGreg Kroah-Hartman retval = uport->ops->request_port(uport); 826ab4382d2SGreg Kroah-Hartman } else { 827ab4382d2SGreg Kroah-Hartman /* Always success - Jean II */ 828ab4382d2SGreg Kroah-Hartman retval = 0; 829ab4382d2SGreg Kroah-Hartman } 830ab4382d2SGreg Kroah-Hartman 831ab4382d2SGreg Kroah-Hartman /* 832ab4382d2SGreg Kroah-Hartman * If we fail to request resources for the 833ab4382d2SGreg Kroah-Hartman * new port, try to restore the old settings. 834ab4382d2SGreg Kroah-Hartman */ 835ab4382d2SGreg Kroah-Hartman if (retval && old_type != PORT_UNKNOWN) { 836ab4382d2SGreg Kroah-Hartman uport->iobase = old_iobase; 837ab4382d2SGreg Kroah-Hartman uport->type = old_type; 838ab4382d2SGreg Kroah-Hartman uport->hub6 = old_hub6; 839ab4382d2SGreg Kroah-Hartman uport->iotype = old_iotype; 840ab4382d2SGreg Kroah-Hartman uport->regshift = old_shift; 841ab4382d2SGreg Kroah-Hartman uport->mapbase = old_mapbase; 842ab4382d2SGreg Kroah-Hartman retval = uport->ops->request_port(uport); 843ab4382d2SGreg Kroah-Hartman /* 844ab4382d2SGreg Kroah-Hartman * If we failed to restore the old settings, 845ab4382d2SGreg Kroah-Hartman * we fail like this. 846ab4382d2SGreg Kroah-Hartman */ 847ab4382d2SGreg Kroah-Hartman if (retval) 848ab4382d2SGreg Kroah-Hartman uport->type = PORT_UNKNOWN; 849ab4382d2SGreg Kroah-Hartman 850ab4382d2SGreg Kroah-Hartman /* 851ab4382d2SGreg Kroah-Hartman * We failed anyway. 852ab4382d2SGreg Kroah-Hartman */ 853ab4382d2SGreg Kroah-Hartman retval = -EBUSY; 854ab4382d2SGreg Kroah-Hartman /* Added to return the correct error -Ram Gupta */ 855ab4382d2SGreg Kroah-Hartman goto exit; 856ab4382d2SGreg Kroah-Hartman } 857ab4382d2SGreg Kroah-Hartman } 858ab4382d2SGreg Kroah-Hartman 859ab4382d2SGreg Kroah-Hartman if (change_irq) 8607ba2e769SAlan Cox uport->irq = new_info->irq; 861ab4382d2SGreg Kroah-Hartman if (!(uport->flags & UPF_FIXED_PORT)) 8627ba2e769SAlan Cox uport->uartclk = new_info->baud_base * 16; 863ab4382d2SGreg Kroah-Hartman uport->flags = (uport->flags & ~UPF_CHANGE_MASK) | 864ab4382d2SGreg Kroah-Hartman (new_flags & UPF_CHANGE_MASK); 8657ba2e769SAlan Cox uport->custom_divisor = new_info->custom_divisor; 866ab4382d2SGreg Kroah-Hartman port->close_delay = close_delay; 867ab4382d2SGreg Kroah-Hartman port->closing_wait = closing_wait; 8687ba2e769SAlan Cox if (new_info->xmit_fifo_size) 8697ba2e769SAlan Cox uport->fifosize = new_info->xmit_fifo_size; 870d6c53c0eSJiri Slaby port->low_latency = (uport->flags & UPF_LOW_LATENCY) ? 1 : 0; 871ab4382d2SGreg Kroah-Hartman 872ab4382d2SGreg Kroah-Hartman check_and_exit: 873ab4382d2SGreg Kroah-Hartman retval = 0; 874ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) 875ab4382d2SGreg Kroah-Hartman goto exit; 876ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_INITIALIZED) { 877ab4382d2SGreg Kroah-Hartman if (((old_flags ^ uport->flags) & UPF_SPD_MASK) || 878ab4382d2SGreg Kroah-Hartman old_custom_divisor != uport->custom_divisor) { 879ab4382d2SGreg Kroah-Hartman /* 880ab4382d2SGreg Kroah-Hartman * If they're setting up a custom divisor or speed, 881ab4382d2SGreg Kroah-Hartman * instead of clearing it, then bitch about it. No 882ab4382d2SGreg Kroah-Hartman * need to rate-limit; it's CAP_SYS_ADMIN only. 883ab4382d2SGreg Kroah-Hartman */ 884ab4382d2SGreg Kroah-Hartman if (uport->flags & UPF_SPD_MASK) { 885ab4382d2SGreg Kroah-Hartman char buf[64]; 886ab4382d2SGreg Kroah-Hartman printk(KERN_NOTICE 887ab4382d2SGreg Kroah-Hartman "%s sets custom speed on %s. This " 888ab4382d2SGreg Kroah-Hartman "is deprecated.\n", current->comm, 889ab4382d2SGreg Kroah-Hartman tty_name(port->tty, buf)); 890ab4382d2SGreg Kroah-Hartman } 891ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 892ab4382d2SGreg Kroah-Hartman } 893ab4382d2SGreg Kroah-Hartman } else 894ab4382d2SGreg Kroah-Hartman retval = uart_startup(tty, state, 1); 895ab4382d2SGreg Kroah-Hartman exit: 8967ba2e769SAlan Cox return retval; 8977ba2e769SAlan Cox } 8987ba2e769SAlan Cox 8997ba2e769SAlan Cox static int uart_set_info_user(struct tty_struct *tty, struct uart_state *state, 9007ba2e769SAlan Cox struct serial_struct __user *newinfo) 9017ba2e769SAlan Cox { 9027ba2e769SAlan Cox struct serial_struct new_serial; 9037ba2e769SAlan Cox struct tty_port *port = &state->port; 9047ba2e769SAlan Cox int retval; 9057ba2e769SAlan Cox 9067ba2e769SAlan Cox if (copy_from_user(&new_serial, newinfo, sizeof(new_serial))) 9077ba2e769SAlan Cox return -EFAULT; 9087ba2e769SAlan Cox 9097ba2e769SAlan Cox /* 9107ba2e769SAlan Cox * This semaphore protects port->count. It is also 9117ba2e769SAlan Cox * very useful to prevent opens. Also, take the 9127ba2e769SAlan Cox * port configuration semaphore to make sure that a 9137ba2e769SAlan Cox * module insertion/removal doesn't change anything 9147ba2e769SAlan Cox * under us. 9157ba2e769SAlan Cox */ 9167ba2e769SAlan Cox mutex_lock(&port->mutex); 9177ba2e769SAlan Cox retval = uart_set_info(tty, port, state, &new_serial); 918ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 919ab4382d2SGreg Kroah-Hartman return retval; 920ab4382d2SGreg Kroah-Hartman } 921ab4382d2SGreg Kroah-Hartman 922ab4382d2SGreg Kroah-Hartman /** 923ab4382d2SGreg Kroah-Hartman * uart_get_lsr_info - get line status register info 924ab4382d2SGreg Kroah-Hartman * @tty: tty associated with the UART 925ab4382d2SGreg Kroah-Hartman * @state: UART being queried 926ab4382d2SGreg Kroah-Hartman * @value: returned modem value 927ab4382d2SGreg Kroah-Hartman * 928ab4382d2SGreg Kroah-Hartman * Note: uart_ioctl protects us against hangups. 929ab4382d2SGreg Kroah-Hartman */ 930ab4382d2SGreg Kroah-Hartman static int uart_get_lsr_info(struct tty_struct *tty, 931ab4382d2SGreg Kroah-Hartman struct uart_state *state, unsigned int __user *value) 932ab4382d2SGreg Kroah-Hartman { 933ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 934ab4382d2SGreg Kroah-Hartman unsigned int result; 935ab4382d2SGreg Kroah-Hartman 936ab4382d2SGreg Kroah-Hartman result = uport->ops->tx_empty(uport); 937ab4382d2SGreg Kroah-Hartman 938ab4382d2SGreg Kroah-Hartman /* 939ab4382d2SGreg Kroah-Hartman * If we're about to load something into the transmit 940ab4382d2SGreg Kroah-Hartman * register, we'll pretend the transmitter isn't empty to 941ab4382d2SGreg Kroah-Hartman * avoid a race condition (depending on when the transmit 942ab4382d2SGreg Kroah-Hartman * interrupt happens). 943ab4382d2SGreg Kroah-Hartman */ 944ab4382d2SGreg Kroah-Hartman if (uport->x_char || 945ab4382d2SGreg Kroah-Hartman ((uart_circ_chars_pending(&state->xmit) > 0) && 946ab4382d2SGreg Kroah-Hartman !tty->stopped && !tty->hw_stopped)) 947ab4382d2SGreg Kroah-Hartman result &= ~TIOCSER_TEMT; 948ab4382d2SGreg Kroah-Hartman 949ab4382d2SGreg Kroah-Hartman return put_user(result, value); 950ab4382d2SGreg Kroah-Hartman } 951ab4382d2SGreg Kroah-Hartman 95260b33c13SAlan Cox static int uart_tiocmget(struct tty_struct *tty) 953ab4382d2SGreg Kroah-Hartman { 954ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 955ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 956ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 957ab4382d2SGreg Kroah-Hartman int result = -EIO; 958ab4382d2SGreg Kroah-Hartman 959ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 96060b33c13SAlan Cox if (!(tty->flags & (1 << TTY_IO_ERROR))) { 961ab4382d2SGreg Kroah-Hartman result = uport->mctrl; 962ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 963ab4382d2SGreg Kroah-Hartman result |= uport->ops->get_mctrl(uport); 964ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 965ab4382d2SGreg Kroah-Hartman } 966ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 967ab4382d2SGreg Kroah-Hartman 968ab4382d2SGreg Kroah-Hartman return result; 969ab4382d2SGreg Kroah-Hartman } 970ab4382d2SGreg Kroah-Hartman 971ab4382d2SGreg Kroah-Hartman static int 97220b9d177SAlan Cox uart_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear) 973ab4382d2SGreg Kroah-Hartman { 974ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 975ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 976ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 977ab4382d2SGreg Kroah-Hartman int ret = -EIO; 978ab4382d2SGreg Kroah-Hartman 979ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 98020b9d177SAlan Cox if (!(tty->flags & (1 << TTY_IO_ERROR))) { 981ab4382d2SGreg Kroah-Hartman uart_update_mctrl(uport, set, clear); 982ab4382d2SGreg Kroah-Hartman ret = 0; 983ab4382d2SGreg Kroah-Hartman } 984ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 985ab4382d2SGreg Kroah-Hartman return ret; 986ab4382d2SGreg Kroah-Hartman } 987ab4382d2SGreg Kroah-Hartman 988ab4382d2SGreg Kroah-Hartman static int uart_break_ctl(struct tty_struct *tty, int break_state) 989ab4382d2SGreg Kroah-Hartman { 990ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 991ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 992ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 993ab4382d2SGreg Kroah-Hartman 994ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 995ab4382d2SGreg Kroah-Hartman 996ab4382d2SGreg Kroah-Hartman if (uport->type != PORT_UNKNOWN) 997ab4382d2SGreg Kroah-Hartman uport->ops->break_ctl(uport, break_state); 998ab4382d2SGreg Kroah-Hartman 999ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1000ab4382d2SGreg Kroah-Hartman return 0; 1001ab4382d2SGreg Kroah-Hartman } 1002ab4382d2SGreg Kroah-Hartman 1003ab4382d2SGreg Kroah-Hartman static int uart_do_autoconfig(struct tty_struct *tty,struct uart_state *state) 1004ab4382d2SGreg Kroah-Hartman { 1005ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1006ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1007ab4382d2SGreg Kroah-Hartman int flags, ret; 1008ab4382d2SGreg Kroah-Hartman 1009ab4382d2SGreg Kroah-Hartman if (!capable(CAP_SYS_ADMIN)) 1010ab4382d2SGreg Kroah-Hartman return -EPERM; 1011ab4382d2SGreg Kroah-Hartman 1012ab4382d2SGreg Kroah-Hartman /* 1013ab4382d2SGreg Kroah-Hartman * Take the per-port semaphore. This prevents count from 1014ab4382d2SGreg Kroah-Hartman * changing, and hence any extra opens of the port while 1015ab4382d2SGreg Kroah-Hartman * we're auto-configuring. 1016ab4382d2SGreg Kroah-Hartman */ 1017ab4382d2SGreg Kroah-Hartman if (mutex_lock_interruptible(&port->mutex)) 1018ab4382d2SGreg Kroah-Hartman return -ERESTARTSYS; 1019ab4382d2SGreg Kroah-Hartman 1020ab4382d2SGreg Kroah-Hartman ret = -EBUSY; 1021ab4382d2SGreg Kroah-Hartman if (tty_port_users(port) == 1) { 1022ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 1023ab4382d2SGreg Kroah-Hartman 1024ab4382d2SGreg Kroah-Hartman /* 1025ab4382d2SGreg Kroah-Hartman * If we already have a port type configured, 1026ab4382d2SGreg Kroah-Hartman * we must release its resources. 1027ab4382d2SGreg Kroah-Hartman */ 1028ab4382d2SGreg Kroah-Hartman if (uport->type != PORT_UNKNOWN) 1029ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 1030ab4382d2SGreg Kroah-Hartman 1031ab4382d2SGreg Kroah-Hartman flags = UART_CONFIG_TYPE; 1032ab4382d2SGreg Kroah-Hartman if (uport->flags & UPF_AUTO_IRQ) 1033ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_IRQ; 1034ab4382d2SGreg Kroah-Hartman 1035ab4382d2SGreg Kroah-Hartman /* 1036ab4382d2SGreg Kroah-Hartman * This will claim the ports resources if 1037ab4382d2SGreg Kroah-Hartman * a port is found. 1038ab4382d2SGreg Kroah-Hartman */ 1039ab4382d2SGreg Kroah-Hartman uport->ops->config_port(uport, flags); 1040ab4382d2SGreg Kroah-Hartman 1041ab4382d2SGreg Kroah-Hartman ret = uart_startup(tty, state, 1); 1042ab4382d2SGreg Kroah-Hartman } 1043ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1044ab4382d2SGreg Kroah-Hartman return ret; 1045ab4382d2SGreg Kroah-Hartman } 1046ab4382d2SGreg Kroah-Hartman 1047ab4382d2SGreg Kroah-Hartman /* 1048ab4382d2SGreg Kroah-Hartman * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change 1049ab4382d2SGreg Kroah-Hartman * - mask passed in arg for lines of interest 1050ab4382d2SGreg Kroah-Hartman * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) 1051ab4382d2SGreg Kroah-Hartman * Caller should use TIOCGICOUNT to see which one it was 1052ab4382d2SGreg Kroah-Hartman * 1053ab4382d2SGreg Kroah-Hartman * FIXME: This wants extracting into a common all driver implementation 1054ab4382d2SGreg Kroah-Hartman * of TIOCMWAIT using tty_port. 1055ab4382d2SGreg Kroah-Hartman */ 1056ab4382d2SGreg Kroah-Hartman static int 1057ab4382d2SGreg Kroah-Hartman uart_wait_modem_status(struct uart_state *state, unsigned long arg) 1058ab4382d2SGreg Kroah-Hartman { 1059ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1060ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1061ab4382d2SGreg Kroah-Hartman DECLARE_WAITQUEUE(wait, current); 1062ab4382d2SGreg Kroah-Hartman struct uart_icount cprev, cnow; 1063ab4382d2SGreg Kroah-Hartman int ret; 1064ab4382d2SGreg Kroah-Hartman 1065ab4382d2SGreg Kroah-Hartman /* 1066ab4382d2SGreg Kroah-Hartman * note the counters on entry 1067ab4382d2SGreg Kroah-Hartman */ 1068ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1069ab4382d2SGreg Kroah-Hartman memcpy(&cprev, &uport->icount, sizeof(struct uart_icount)); 1070ab4382d2SGreg Kroah-Hartman 1071ab4382d2SGreg Kroah-Hartman /* 1072ab4382d2SGreg Kroah-Hartman * Force modem status interrupts on 1073ab4382d2SGreg Kroah-Hartman */ 1074ab4382d2SGreg Kroah-Hartman uport->ops->enable_ms(uport); 1075ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1076ab4382d2SGreg Kroah-Hartman 1077ab4382d2SGreg Kroah-Hartman add_wait_queue(&port->delta_msr_wait, &wait); 1078ab4382d2SGreg Kroah-Hartman for (;;) { 1079ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1080ab4382d2SGreg Kroah-Hartman memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); 1081ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1082ab4382d2SGreg Kroah-Hartman 1083ab4382d2SGreg Kroah-Hartman set_current_state(TASK_INTERRUPTIBLE); 1084ab4382d2SGreg Kroah-Hartman 1085ab4382d2SGreg Kroah-Hartman if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || 1086ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || 1087ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || 1088ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) { 1089ab4382d2SGreg Kroah-Hartman ret = 0; 1090ab4382d2SGreg Kroah-Hartman break; 1091ab4382d2SGreg Kroah-Hartman } 1092ab4382d2SGreg Kroah-Hartman 1093ab4382d2SGreg Kroah-Hartman schedule(); 1094ab4382d2SGreg Kroah-Hartman 1095ab4382d2SGreg Kroah-Hartman /* see if a signal did it */ 1096ab4382d2SGreg Kroah-Hartman if (signal_pending(current)) { 1097ab4382d2SGreg Kroah-Hartman ret = -ERESTARTSYS; 1098ab4382d2SGreg Kroah-Hartman break; 1099ab4382d2SGreg Kroah-Hartman } 1100ab4382d2SGreg Kroah-Hartman 1101ab4382d2SGreg Kroah-Hartman cprev = cnow; 1102ab4382d2SGreg Kroah-Hartman } 1103ab4382d2SGreg Kroah-Hartman 1104ab4382d2SGreg Kroah-Hartman current->state = TASK_RUNNING; 1105ab4382d2SGreg Kroah-Hartman remove_wait_queue(&port->delta_msr_wait, &wait); 1106ab4382d2SGreg Kroah-Hartman 1107ab4382d2SGreg Kroah-Hartman return ret; 1108ab4382d2SGreg Kroah-Hartman } 1109ab4382d2SGreg Kroah-Hartman 1110ab4382d2SGreg Kroah-Hartman /* 1111ab4382d2SGreg Kroah-Hartman * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) 1112ab4382d2SGreg Kroah-Hartman * Return: write counters to the user passed counter struct 1113ab4382d2SGreg Kroah-Hartman * NB: both 1->0 and 0->1 transitions are counted except for 1114ab4382d2SGreg Kroah-Hartman * RI where only 0->1 is counted. 1115ab4382d2SGreg Kroah-Hartman */ 1116ab4382d2SGreg Kroah-Hartman static int uart_get_icount(struct tty_struct *tty, 1117ab4382d2SGreg Kroah-Hartman struct serial_icounter_struct *icount) 1118ab4382d2SGreg Kroah-Hartman { 1119ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1120ab4382d2SGreg Kroah-Hartman struct uart_icount cnow; 1121ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1122ab4382d2SGreg Kroah-Hartman 1123ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1124ab4382d2SGreg Kroah-Hartman memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); 1125ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1126ab4382d2SGreg Kroah-Hartman 1127ab4382d2SGreg Kroah-Hartman icount->cts = cnow.cts; 1128ab4382d2SGreg Kroah-Hartman icount->dsr = cnow.dsr; 1129ab4382d2SGreg Kroah-Hartman icount->rng = cnow.rng; 1130ab4382d2SGreg Kroah-Hartman icount->dcd = cnow.dcd; 1131ab4382d2SGreg Kroah-Hartman icount->rx = cnow.rx; 1132ab4382d2SGreg Kroah-Hartman icount->tx = cnow.tx; 1133ab4382d2SGreg Kroah-Hartman icount->frame = cnow.frame; 1134ab4382d2SGreg Kroah-Hartman icount->overrun = cnow.overrun; 1135ab4382d2SGreg Kroah-Hartman icount->parity = cnow.parity; 1136ab4382d2SGreg Kroah-Hartman icount->brk = cnow.brk; 1137ab4382d2SGreg Kroah-Hartman icount->buf_overrun = cnow.buf_overrun; 1138ab4382d2SGreg Kroah-Hartman 1139ab4382d2SGreg Kroah-Hartman return 0; 1140ab4382d2SGreg Kroah-Hartman } 1141ab4382d2SGreg Kroah-Hartman 1142ab4382d2SGreg Kroah-Hartman /* 1143ab4382d2SGreg Kroah-Hartman * Called via sys_ioctl. We can use spin_lock_irq() here. 1144ab4382d2SGreg Kroah-Hartman */ 1145ab4382d2SGreg Kroah-Hartman static int 11466caa76b7SAlan Cox uart_ioctl(struct tty_struct *tty, unsigned int cmd, 1147ab4382d2SGreg Kroah-Hartman unsigned long arg) 1148ab4382d2SGreg Kroah-Hartman { 1149ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1150ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1151ab4382d2SGreg Kroah-Hartman void __user *uarg = (void __user *)arg; 1152ab4382d2SGreg Kroah-Hartman int ret = -ENOIOCTLCMD; 1153ab4382d2SGreg Kroah-Hartman 1154ab4382d2SGreg Kroah-Hartman 1155ab4382d2SGreg Kroah-Hartman /* 1156ab4382d2SGreg Kroah-Hartman * These ioctls don't rely on the hardware to be present. 1157ab4382d2SGreg Kroah-Hartman */ 1158ab4382d2SGreg Kroah-Hartman switch (cmd) { 1159ab4382d2SGreg Kroah-Hartman case TIOCGSERIAL: 11609f109694SAlan Cox ret = uart_get_info_user(port, uarg); 1161ab4382d2SGreg Kroah-Hartman break; 1162ab4382d2SGreg Kroah-Hartman 1163ab4382d2SGreg Kroah-Hartman case TIOCSSERIAL: 11647ba2e769SAlan Cox ret = uart_set_info_user(tty, state, uarg); 1165ab4382d2SGreg Kroah-Hartman break; 1166ab4382d2SGreg Kroah-Hartman 1167ab4382d2SGreg Kroah-Hartman case TIOCSERCONFIG: 1168ab4382d2SGreg Kroah-Hartman ret = uart_do_autoconfig(tty, state); 1169ab4382d2SGreg Kroah-Hartman break; 1170ab4382d2SGreg Kroah-Hartman 1171ab4382d2SGreg Kroah-Hartman case TIOCSERGWILD: /* obsolete */ 1172ab4382d2SGreg Kroah-Hartman case TIOCSERSWILD: /* obsolete */ 1173ab4382d2SGreg Kroah-Hartman ret = 0; 1174ab4382d2SGreg Kroah-Hartman break; 1175ab4382d2SGreg Kroah-Hartman } 1176ab4382d2SGreg Kroah-Hartman 1177ab4382d2SGreg Kroah-Hartman if (ret != -ENOIOCTLCMD) 1178ab4382d2SGreg Kroah-Hartman goto out; 1179ab4382d2SGreg Kroah-Hartman 1180ab4382d2SGreg Kroah-Hartman if (tty->flags & (1 << TTY_IO_ERROR)) { 1181ab4382d2SGreg Kroah-Hartman ret = -EIO; 1182ab4382d2SGreg Kroah-Hartman goto out; 1183ab4382d2SGreg Kroah-Hartman } 1184ab4382d2SGreg Kroah-Hartman 1185ab4382d2SGreg Kroah-Hartman /* 1186ab4382d2SGreg Kroah-Hartman * The following should only be used when hardware is present. 1187ab4382d2SGreg Kroah-Hartman */ 1188ab4382d2SGreg Kroah-Hartman switch (cmd) { 1189ab4382d2SGreg Kroah-Hartman case TIOCMIWAIT: 1190ab4382d2SGreg Kroah-Hartman ret = uart_wait_modem_status(state, arg); 1191ab4382d2SGreg Kroah-Hartman break; 1192ab4382d2SGreg Kroah-Hartman } 1193ab4382d2SGreg Kroah-Hartman 1194ab4382d2SGreg Kroah-Hartman if (ret != -ENOIOCTLCMD) 1195ab4382d2SGreg Kroah-Hartman goto out; 1196ab4382d2SGreg Kroah-Hartman 1197ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1198ab4382d2SGreg Kroah-Hartman 11996caa76b7SAlan Cox if (tty->flags & (1 << TTY_IO_ERROR)) { 1200ab4382d2SGreg Kroah-Hartman ret = -EIO; 1201ab4382d2SGreg Kroah-Hartman goto out_up; 1202ab4382d2SGreg Kroah-Hartman } 1203ab4382d2SGreg Kroah-Hartman 1204ab4382d2SGreg Kroah-Hartman /* 1205ab4382d2SGreg Kroah-Hartman * All these rely on hardware being present and need to be 1206ab4382d2SGreg Kroah-Hartman * protected against the tty being hung up. 1207ab4382d2SGreg Kroah-Hartman */ 1208ab4382d2SGreg Kroah-Hartman switch (cmd) { 1209ab4382d2SGreg Kroah-Hartman case TIOCSERGETLSR: /* Get line status register */ 1210ab4382d2SGreg Kroah-Hartman ret = uart_get_lsr_info(tty, state, uarg); 1211ab4382d2SGreg Kroah-Hartman break; 1212ab4382d2SGreg Kroah-Hartman 1213ab4382d2SGreg Kroah-Hartman default: { 1214ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1215ab4382d2SGreg Kroah-Hartman if (uport->ops->ioctl) 1216ab4382d2SGreg Kroah-Hartman ret = uport->ops->ioctl(uport, cmd, arg); 1217ab4382d2SGreg Kroah-Hartman break; 1218ab4382d2SGreg Kroah-Hartman } 1219ab4382d2SGreg Kroah-Hartman } 1220ab4382d2SGreg Kroah-Hartman out_up: 1221ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1222ab4382d2SGreg Kroah-Hartman out: 1223ab4382d2SGreg Kroah-Hartman return ret; 1224ab4382d2SGreg Kroah-Hartman } 1225ab4382d2SGreg Kroah-Hartman 1226ab4382d2SGreg Kroah-Hartman static void uart_set_ldisc(struct tty_struct *tty) 1227ab4382d2SGreg Kroah-Hartman { 1228ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1229ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1230ab4382d2SGreg Kroah-Hartman 1231ab4382d2SGreg Kroah-Hartman if (uport->ops->set_ldisc) 1232adc8d746SAlan Cox uport->ops->set_ldisc(uport, tty->termios.c_line); 1233ab4382d2SGreg Kroah-Hartman } 1234ab4382d2SGreg Kroah-Hartman 1235ab4382d2SGreg Kroah-Hartman static void uart_set_termios(struct tty_struct *tty, 1236ab4382d2SGreg Kroah-Hartman struct ktermios *old_termios) 1237ab4382d2SGreg Kroah-Hartman { 1238ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1239dec94e70SRussell King struct uart_port *uport = state->uart_port; 1240ab4382d2SGreg Kroah-Hartman unsigned long flags; 1241adc8d746SAlan Cox unsigned int cflag = tty->termios.c_cflag; 12422cbacafdSRussell King unsigned int iflag_mask = IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK; 12432cbacafdSRussell King bool sw_changed = false; 1244ab4382d2SGreg Kroah-Hartman 12452cbacafdSRussell King /* 12462cbacafdSRussell King * Drivers doing software flow control also need to know 12472cbacafdSRussell King * about changes to these input settings. 12482cbacafdSRussell King */ 12492cbacafdSRussell King if (uport->flags & UPF_SOFT_FLOW) { 12502cbacafdSRussell King iflag_mask |= IXANY|IXON|IXOFF; 12512cbacafdSRussell King sw_changed = 12522cbacafdSRussell King tty->termios.c_cc[VSTART] != old_termios->c_cc[VSTART] || 12532cbacafdSRussell King tty->termios.c_cc[VSTOP] != old_termios->c_cc[VSTOP]; 12542cbacafdSRussell King } 1255ab4382d2SGreg Kroah-Hartman 1256ab4382d2SGreg Kroah-Hartman /* 1257ab4382d2SGreg Kroah-Hartman * These are the bits that are used to setup various 1258ab4382d2SGreg Kroah-Hartman * flags in the low level driver. We can ignore the Bfoo 1259ab4382d2SGreg Kroah-Hartman * bits in c_cflag; c_[io]speed will always be set 1260ab4382d2SGreg Kroah-Hartman * appropriately by set_termios() in tty_ioctl.c 1261ab4382d2SGreg Kroah-Hartman */ 1262ab4382d2SGreg Kroah-Hartman if ((cflag ^ old_termios->c_cflag) == 0 && 1263adc8d746SAlan Cox tty->termios.c_ospeed == old_termios->c_ospeed && 1264adc8d746SAlan Cox tty->termios.c_ispeed == old_termios->c_ispeed && 12652cbacafdSRussell King ((tty->termios.c_iflag ^ old_termios->c_iflag) & iflag_mask) == 0 && 12662cbacafdSRussell King !sw_changed) { 1267ab4382d2SGreg Kroah-Hartman return; 1268ab4382d2SGreg Kroah-Hartman } 1269ab4382d2SGreg Kroah-Hartman 1270ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, old_termios); 1271ab4382d2SGreg Kroah-Hartman 1272ab4382d2SGreg Kroah-Hartman /* Handle transition to B0 status */ 1273ab4382d2SGreg Kroah-Hartman if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) 1274dec94e70SRussell King uart_clear_mctrl(uport, TIOCM_RTS | TIOCM_DTR); 1275ab4382d2SGreg Kroah-Hartman /* Handle transition away from B0 status */ 1276ab4382d2SGreg Kroah-Hartman else if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { 1277ab4382d2SGreg Kroah-Hartman unsigned int mask = TIOCM_DTR; 1278ab4382d2SGreg Kroah-Hartman if (!(cflag & CRTSCTS) || 1279ab4382d2SGreg Kroah-Hartman !test_bit(TTY_THROTTLED, &tty->flags)) 1280ab4382d2SGreg Kroah-Hartman mask |= TIOCM_RTS; 1281dec94e70SRussell King uart_set_mctrl(uport, mask); 1282ab4382d2SGreg Kroah-Hartman } 1283ab4382d2SGreg Kroah-Hartman 1284dba05832SRussell King /* 1285dba05832SRussell King * If the port is doing h/w assisted flow control, do nothing. 1286dba05832SRussell King * We assume that tty->hw_stopped has never been set. 1287dba05832SRussell King */ 1288dba05832SRussell King if (uport->flags & UPF_HARD_FLOW) 1289dba05832SRussell King return; 1290dba05832SRussell King 1291ab4382d2SGreg Kroah-Hartman /* Handle turning off CRTSCTS */ 1292ab4382d2SGreg Kroah-Hartman if ((old_termios->c_cflag & CRTSCTS) && !(cflag & CRTSCTS)) { 1293dec94e70SRussell King spin_lock_irqsave(&uport->lock, flags); 1294ab4382d2SGreg Kroah-Hartman tty->hw_stopped = 0; 1295ab4382d2SGreg Kroah-Hartman __uart_start(tty); 1296dec94e70SRussell King spin_unlock_irqrestore(&uport->lock, flags); 1297ab4382d2SGreg Kroah-Hartman } 1298ab4382d2SGreg Kroah-Hartman /* Handle turning on CRTSCTS */ 1299ab4382d2SGreg Kroah-Hartman else if (!(old_termios->c_cflag & CRTSCTS) && (cflag & CRTSCTS)) { 1300dec94e70SRussell King spin_lock_irqsave(&uport->lock, flags); 1301dec94e70SRussell King if (!(uport->ops->get_mctrl(uport) & TIOCM_CTS)) { 1302ab4382d2SGreg Kroah-Hartman tty->hw_stopped = 1; 1303dec94e70SRussell King uport->ops->stop_tx(uport); 1304ab4382d2SGreg Kroah-Hartman } 1305dec94e70SRussell King spin_unlock_irqrestore(&uport->lock, flags); 1306ab4382d2SGreg Kroah-Hartman } 1307ab4382d2SGreg Kroah-Hartman } 1308ab4382d2SGreg Kroah-Hartman 1309ab4382d2SGreg Kroah-Hartman /* 1310ef4f527cSKevin Cernekee * Calls to uart_close() are serialised via the tty_lock in 1311ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:tty_release() 1312ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:do_tty_hangup() 1313ef4f527cSKevin Cernekee * This runs from a workqueue and can sleep for a _short_ time only. 1314ab4382d2SGreg Kroah-Hartman */ 1315ab4382d2SGreg Kroah-Hartman static void uart_close(struct tty_struct *tty, struct file *filp) 1316ab4382d2SGreg Kroah-Hartman { 1317ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1318ab4382d2SGreg Kroah-Hartman struct tty_port *port; 1319ab4382d2SGreg Kroah-Hartman struct uart_port *uport; 1320ab4382d2SGreg Kroah-Hartman unsigned long flags; 1321ab4382d2SGreg Kroah-Hartman 1322ab4382d2SGreg Kroah-Hartman if (!state) 1323ab4382d2SGreg Kroah-Hartman return; 1324ab4382d2SGreg Kroah-Hartman 1325ab4382d2SGreg Kroah-Hartman uport = state->uart_port; 1326ab4382d2SGreg Kroah-Hartman port = &state->port; 1327ab4382d2SGreg Kroah-Hartman 1328ab4382d2SGreg Kroah-Hartman pr_debug("uart_close(%d) called\n", uport->line); 1329ab4382d2SGreg Kroah-Hartman 1330d30ccf08SJiri Slaby if (tty_port_close_start(port, tty, filp) == 0) 133155956216SNobuhiro Iwamatsu return; 1332ab4382d2SGreg Kroah-Hartman 1333ab4382d2SGreg Kroah-Hartman /* 1334ab4382d2SGreg Kroah-Hartman * At this point, we stop accepting input. To do this, we 1335ab4382d2SGreg Kroah-Hartman * disable the receive line status interrupts. 1336ab4382d2SGreg Kroah-Hartman */ 1337ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_INITIALIZED) { 1338ab4382d2SGreg Kroah-Hartman unsigned long flags; 1339ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&uport->lock, flags); 1340ab4382d2SGreg Kroah-Hartman uport->ops->stop_rx(uport); 1341ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&uport->lock, flags); 1342ab4382d2SGreg Kroah-Hartman /* 1343ab4382d2SGreg Kroah-Hartman * Before we drop DTR, make sure the UART transmitter 1344ab4382d2SGreg Kroah-Hartman * has completely drained; this is especially 1345ab4382d2SGreg Kroah-Hartman * important if there is a transmit FIFO! 1346ab4382d2SGreg Kroah-Hartman */ 13471f33a51dSJiri Slaby uart_wait_until_sent(tty, uport->timeout); 1348ab4382d2SGreg Kroah-Hartman } 1349ab4382d2SGreg Kroah-Hartman 1350bafb0bd2SJiri Slaby mutex_lock(&port->mutex); 1351ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 1352ab4382d2SGreg Kroah-Hartman uart_flush_buffer(tty); 1353ab4382d2SGreg Kroah-Hartman 1354ab4382d2SGreg Kroah-Hartman tty_ldisc_flush(tty); 1355ab4382d2SGreg Kroah-Hartman 1356ab4382d2SGreg Kroah-Hartman tty_port_tty_set(port, NULL); 1357ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 1358ab4382d2SGreg Kroah-Hartman tty->closing = 0; 1359ab4382d2SGreg Kroah-Hartman 1360ab4382d2SGreg Kroah-Hartman if (port->blocked_open) { 1361ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 1362ab4382d2SGreg Kroah-Hartman if (port->close_delay) 13634cb0fbfdSJiri Slaby msleep_interruptible( 13644cb0fbfdSJiri Slaby jiffies_to_msecs(port->close_delay)); 1365ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 1366ab4382d2SGreg Kroah-Hartman } else if (!uart_console(uport)) { 1367ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 13686f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_OFF); 1369ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 1370ab4382d2SGreg Kroah-Hartman } 1371ab4382d2SGreg Kroah-Hartman 1372ab4382d2SGreg Kroah-Hartman /* 1373ab4382d2SGreg Kroah-Hartman * Wake up anyone trying to open this port. 1374ab4382d2SGreg Kroah-Hartman */ 1375ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); 1376426929f8SJiri Slaby clear_bit(ASYNCB_CLOSING, &port->flags); 1377ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 1378ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->open_wait); 1379426929f8SJiri Slaby wake_up_interruptible(&port->close_wait); 1380ab4382d2SGreg Kroah-Hartman 1381ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1382ab4382d2SGreg Kroah-Hartman } 1383ab4382d2SGreg Kroah-Hartman 13841f33a51dSJiri Slaby static void uart_wait_until_sent(struct tty_struct *tty, int timeout) 1385ab4382d2SGreg Kroah-Hartman { 13861f33a51dSJiri Slaby struct uart_state *state = tty->driver_data; 13871f33a51dSJiri Slaby struct uart_port *port = state->uart_port; 1388ab4382d2SGreg Kroah-Hartman unsigned long char_time, expire; 1389ab4382d2SGreg Kroah-Hartman 1390ab4382d2SGreg Kroah-Hartman if (port->type == PORT_UNKNOWN || port->fifosize == 0) 1391ab4382d2SGreg Kroah-Hartman return; 1392ab4382d2SGreg Kroah-Hartman 1393ab4382d2SGreg Kroah-Hartman /* 1394ab4382d2SGreg Kroah-Hartman * Set the check interval to be 1/5 of the estimated time to 1395ab4382d2SGreg Kroah-Hartman * send a single character, and make it at least 1. The check 1396ab4382d2SGreg Kroah-Hartman * interval should also be less than the timeout. 1397ab4382d2SGreg Kroah-Hartman * 1398ab4382d2SGreg Kroah-Hartman * Note: we have to use pretty tight timings here to satisfy 1399ab4382d2SGreg Kroah-Hartman * the NIST-PCTS. 1400ab4382d2SGreg Kroah-Hartman */ 1401ab4382d2SGreg Kroah-Hartman char_time = (port->timeout - HZ/50) / port->fifosize; 1402ab4382d2SGreg Kroah-Hartman char_time = char_time / 5; 1403ab4382d2SGreg Kroah-Hartman if (char_time == 0) 1404ab4382d2SGreg Kroah-Hartman char_time = 1; 1405ab4382d2SGreg Kroah-Hartman if (timeout && timeout < char_time) 1406ab4382d2SGreg Kroah-Hartman char_time = timeout; 1407ab4382d2SGreg Kroah-Hartman 1408ab4382d2SGreg Kroah-Hartman /* 1409ab4382d2SGreg Kroah-Hartman * If the transmitter hasn't cleared in twice the approximate 1410ab4382d2SGreg Kroah-Hartman * amount of time to send the entire FIFO, it probably won't 1411ab4382d2SGreg Kroah-Hartman * ever clear. This assumes the UART isn't doing flow 1412ab4382d2SGreg Kroah-Hartman * control, which is currently the case. Hence, if it ever 1413ab4382d2SGreg Kroah-Hartman * takes longer than port->timeout, this is probably due to a 1414ab4382d2SGreg Kroah-Hartman * UART bug of some kind. So, we clamp the timeout parameter at 1415ab4382d2SGreg Kroah-Hartman * 2*port->timeout. 1416ab4382d2SGreg Kroah-Hartman */ 1417ab4382d2SGreg Kroah-Hartman if (timeout == 0 || timeout > 2 * port->timeout) 1418ab4382d2SGreg Kroah-Hartman timeout = 2 * port->timeout; 1419ab4382d2SGreg Kroah-Hartman 1420ab4382d2SGreg Kroah-Hartman expire = jiffies + timeout; 1421ab4382d2SGreg Kroah-Hartman 1422ab4382d2SGreg Kroah-Hartman pr_debug("uart_wait_until_sent(%d), jiffies=%lu, expire=%lu...\n", 1423ab4382d2SGreg Kroah-Hartman port->line, jiffies, expire); 1424ab4382d2SGreg Kroah-Hartman 1425ab4382d2SGreg Kroah-Hartman /* 1426ab4382d2SGreg Kroah-Hartman * Check whether the transmitter is empty every 'char_time'. 1427ab4382d2SGreg Kroah-Hartman * 'timeout' / 'expire' give us the maximum amount of time 1428ab4382d2SGreg Kroah-Hartman * we wait. 1429ab4382d2SGreg Kroah-Hartman */ 1430ab4382d2SGreg Kroah-Hartman while (!port->ops->tx_empty(port)) { 1431ab4382d2SGreg Kroah-Hartman msleep_interruptible(jiffies_to_msecs(char_time)); 1432ab4382d2SGreg Kroah-Hartman if (signal_pending(current)) 1433ab4382d2SGreg Kroah-Hartman break; 1434ab4382d2SGreg Kroah-Hartman if (time_after(jiffies, expire)) 1435ab4382d2SGreg Kroah-Hartman break; 1436ab4382d2SGreg Kroah-Hartman } 1437ab4382d2SGreg Kroah-Hartman } 1438ab4382d2SGreg Kroah-Hartman 1439ab4382d2SGreg Kroah-Hartman /* 1440ef4f527cSKevin Cernekee * Calls to uart_hangup() are serialised by the tty_lock in 1441ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:do_tty_hangup() 1442ef4f527cSKevin Cernekee * This runs from a workqueue and can sleep for a _short_ time only. 1443ab4382d2SGreg Kroah-Hartman */ 1444ab4382d2SGreg Kroah-Hartman static void uart_hangup(struct tty_struct *tty) 1445ab4382d2SGreg Kroah-Hartman { 1446ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1447ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1448ab4382d2SGreg Kroah-Hartman unsigned long flags; 1449ab4382d2SGreg Kroah-Hartman 1450ab4382d2SGreg Kroah-Hartman pr_debug("uart_hangup(%d)\n", state->uart_port->line); 1451ab4382d2SGreg Kroah-Hartman 1452ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1453ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_NORMAL_ACTIVE) { 1454ab4382d2SGreg Kroah-Hartman uart_flush_buffer(tty); 1455ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 1456ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 1457ab4382d2SGreg Kroah-Hartman port->count = 0; 1458ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); 1459ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 1460ab4382d2SGreg Kroah-Hartman tty_port_tty_set(port, NULL); 1461ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->open_wait); 1462ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->delta_msr_wait); 1463ab4382d2SGreg Kroah-Hartman } 1464ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1465ab4382d2SGreg Kroah-Hartman } 1466ab4382d2SGreg Kroah-Hartman 14670b1db830SJiri Slaby static int uart_port_activate(struct tty_port *port, struct tty_struct *tty) 14680b1db830SJiri Slaby { 14690b1db830SJiri Slaby return 0; 14700b1db830SJiri Slaby } 14710b1db830SJiri Slaby 14720b1db830SJiri Slaby static void uart_port_shutdown(struct tty_port *port) 14730b1db830SJiri Slaby { 1474b922e19dSJiri Slaby struct uart_state *state = container_of(port, struct uart_state, port); 1475b922e19dSJiri Slaby struct uart_port *uport = state->uart_port; 1476b922e19dSJiri Slaby 1477b922e19dSJiri Slaby /* 1478b922e19dSJiri Slaby * clear delta_msr_wait queue to avoid mem leaks: we may free 1479b922e19dSJiri Slaby * the irq here so the queue might never be woken up. Note 1480b922e19dSJiri Slaby * that we won't end up waiting on delta_msr_wait again since 1481b922e19dSJiri Slaby * any outstanding file descriptors should be pointing at 1482b922e19dSJiri Slaby * hung_up_tty_fops now. 1483b922e19dSJiri Slaby */ 1484b922e19dSJiri Slaby wake_up_interruptible(&port->delta_msr_wait); 1485b922e19dSJiri Slaby 1486b922e19dSJiri Slaby /* 1487b922e19dSJiri Slaby * Free the IRQ and disable the port. 1488b922e19dSJiri Slaby */ 1489b922e19dSJiri Slaby uport->ops->shutdown(uport); 1490b922e19dSJiri Slaby 1491b922e19dSJiri Slaby /* 1492b922e19dSJiri Slaby * Ensure that the IRQ handler isn't running on another CPU. 1493b922e19dSJiri Slaby */ 1494b922e19dSJiri Slaby synchronize_irq(uport->irq); 14950b1db830SJiri Slaby } 14960b1db830SJiri Slaby 1497ab4382d2SGreg Kroah-Hartman static int uart_carrier_raised(struct tty_port *port) 1498ab4382d2SGreg Kroah-Hartman { 1499ab4382d2SGreg Kroah-Hartman struct uart_state *state = container_of(port, struct uart_state, port); 1500ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1501ab4382d2SGreg Kroah-Hartman int mctrl; 1502ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1503ab4382d2SGreg Kroah-Hartman uport->ops->enable_ms(uport); 1504ab4382d2SGreg Kroah-Hartman mctrl = uport->ops->get_mctrl(uport); 1505ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1506ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_CAR) 1507ab4382d2SGreg Kroah-Hartman return 1; 1508ab4382d2SGreg Kroah-Hartman return 0; 1509ab4382d2SGreg Kroah-Hartman } 1510ab4382d2SGreg Kroah-Hartman 1511ab4382d2SGreg Kroah-Hartman static void uart_dtr_rts(struct tty_port *port, int onoff) 1512ab4382d2SGreg Kroah-Hartman { 1513ab4382d2SGreg Kroah-Hartman struct uart_state *state = container_of(port, struct uart_state, port); 1514ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1515ab4382d2SGreg Kroah-Hartman 15166f5c24adSJiri Slaby if (onoff) 1517ab4382d2SGreg Kroah-Hartman uart_set_mctrl(uport, TIOCM_DTR | TIOCM_RTS); 1518ab4382d2SGreg Kroah-Hartman else 1519ab4382d2SGreg Kroah-Hartman uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); 1520ab4382d2SGreg Kroah-Hartman } 1521ab4382d2SGreg Kroah-Hartman 1522ab4382d2SGreg Kroah-Hartman /* 1523ef4f527cSKevin Cernekee * Calls to uart_open are serialised by the tty_lock in 1524ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:tty_open() 1525ab4382d2SGreg Kroah-Hartman * Note that if this fails, then uart_close() _will_ be called. 1526ab4382d2SGreg Kroah-Hartman * 1527ab4382d2SGreg Kroah-Hartman * In time, we want to scrap the "opening nonpresent ports" 1528ab4382d2SGreg Kroah-Hartman * behaviour and implement an alternative way for setserial 1529ab4382d2SGreg Kroah-Hartman * to set base addresses/ports/types. This will allow us to 1530ab4382d2SGreg Kroah-Hartman * get rid of a certain amount of extra tests. 1531ab4382d2SGreg Kroah-Hartman */ 1532ab4382d2SGreg Kroah-Hartman static int uart_open(struct tty_struct *tty, struct file *filp) 1533ab4382d2SGreg Kroah-Hartman { 1534ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = (struct uart_driver *)tty->driver->driver_state; 1535ab4382d2SGreg Kroah-Hartman int retval, line = tty->index; 15361c7b13c4SJiri Slaby struct uart_state *state = drv->state + line; 15371c7b13c4SJiri Slaby struct tty_port *port = &state->port; 1538ab4382d2SGreg Kroah-Hartman 1539ab4382d2SGreg Kroah-Hartman pr_debug("uart_open(%d) called\n", line); 1540ab4382d2SGreg Kroah-Hartman 1541ab4382d2SGreg Kroah-Hartman /* 15421c7b13c4SJiri Slaby * We take the semaphore here to guarantee that we won't be re-entered 15431c7b13c4SJiri Slaby * while allocating the state structure, or while we request any IRQs 15441c7b13c4SJiri Slaby * that the driver may need. This also has the nice side-effect that 15451c7b13c4SJiri Slaby * it delays the action of uart_hangup, so we can guarantee that 15461c7b13c4SJiri Slaby * state->port.tty will always contain something reasonable. 1547ab4382d2SGreg Kroah-Hartman */ 15481c7b13c4SJiri Slaby if (mutex_lock_interruptible(&port->mutex)) { 15491c7b13c4SJiri Slaby retval = -ERESTARTSYS; 15501c7b13c4SJiri Slaby goto end; 1551ab4382d2SGreg Kroah-Hartman } 15521c7b13c4SJiri Slaby 15531c7b13c4SJiri Slaby port->count++; 15541c7b13c4SJiri Slaby if (!state->uart_port || state->uart_port->flags & UPF_DEAD) { 15551c7b13c4SJiri Slaby retval = -ENXIO; 15561c7b13c4SJiri Slaby goto err_dec_count; 15571c7b13c4SJiri Slaby } 1558ab4382d2SGreg Kroah-Hartman 1559ab4382d2SGreg Kroah-Hartman /* 1560ab4382d2SGreg Kroah-Hartman * Once we set tty->driver_data here, we are guaranteed that 1561ab4382d2SGreg Kroah-Hartman * uart_close() will decrement the driver module use count. 1562ab4382d2SGreg Kroah-Hartman * Any failures from here onwards should not touch the count. 1563ab4382d2SGreg Kroah-Hartman */ 1564ab4382d2SGreg Kroah-Hartman tty->driver_data = state; 1565ab4382d2SGreg Kroah-Hartman state->uart_port->state = state; 1566d6c53c0eSJiri Slaby state->port.low_latency = 1567d6c53c0eSJiri Slaby (state->uart_port->flags & UPF_LOW_LATENCY) ? 1 : 0; 1568ab4382d2SGreg Kroah-Hartman tty_port_tty_set(port, tty); 1569ab4382d2SGreg Kroah-Hartman 1570ab4382d2SGreg Kroah-Hartman /* 1571ab4382d2SGreg Kroah-Hartman * If the port is in the middle of closing, bail out now. 1572ab4382d2SGreg Kroah-Hartman */ 1573ab4382d2SGreg Kroah-Hartman if (tty_hung_up_p(filp)) { 1574ab4382d2SGreg Kroah-Hartman retval = -EAGAIN; 15751c7b13c4SJiri Slaby goto err_dec_count; 1576ab4382d2SGreg Kroah-Hartman } 1577ab4382d2SGreg Kroah-Hartman 1578ab4382d2SGreg Kroah-Hartman /* 1579ab4382d2SGreg Kroah-Hartman * Make sure the device is in D0 state. 1580ab4382d2SGreg Kroah-Hartman */ 1581ab4382d2SGreg Kroah-Hartman if (port->count == 1) 15826f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 1583ab4382d2SGreg Kroah-Hartman 1584ab4382d2SGreg Kroah-Hartman /* 1585ab4382d2SGreg Kroah-Hartman * Start up the serial port. 1586ab4382d2SGreg Kroah-Hartman */ 1587ab4382d2SGreg Kroah-Hartman retval = uart_startup(tty, state, 0); 1588ab4382d2SGreg Kroah-Hartman 1589ab4382d2SGreg Kroah-Hartman /* 1590ab4382d2SGreg Kroah-Hartman * If we succeeded, wait until the port is ready. 1591ab4382d2SGreg Kroah-Hartman */ 1592ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1593ab4382d2SGreg Kroah-Hartman if (retval == 0) 1594ab4382d2SGreg Kroah-Hartman retval = tty_port_block_til_ready(port, tty, filp); 1595ab4382d2SGreg Kroah-Hartman 15961c7b13c4SJiri Slaby end: 1597ab4382d2SGreg Kroah-Hartman return retval; 15981c7b13c4SJiri Slaby err_dec_count: 15991c7b13c4SJiri Slaby port->count--; 16001c7b13c4SJiri Slaby mutex_unlock(&port->mutex); 16011c7b13c4SJiri Slaby goto end; 1602ab4382d2SGreg Kroah-Hartman } 1603ab4382d2SGreg Kroah-Hartman 1604ab4382d2SGreg Kroah-Hartman static const char *uart_type(struct uart_port *port) 1605ab4382d2SGreg Kroah-Hartman { 1606ab4382d2SGreg Kroah-Hartman const char *str = NULL; 1607ab4382d2SGreg Kroah-Hartman 1608ab4382d2SGreg Kroah-Hartman if (port->ops->type) 1609ab4382d2SGreg Kroah-Hartman str = port->ops->type(port); 1610ab4382d2SGreg Kroah-Hartman 1611ab4382d2SGreg Kroah-Hartman if (!str) 1612ab4382d2SGreg Kroah-Hartman str = "unknown"; 1613ab4382d2SGreg Kroah-Hartman 1614ab4382d2SGreg Kroah-Hartman return str; 1615ab4382d2SGreg Kroah-Hartman } 1616ab4382d2SGreg Kroah-Hartman 1617ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_PROC_FS 1618ab4382d2SGreg Kroah-Hartman 1619ab4382d2SGreg Kroah-Hartman static void uart_line_info(struct seq_file *m, struct uart_driver *drv, int i) 1620ab4382d2SGreg Kroah-Hartman { 1621ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + i; 1622ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 16236f538fe3SLinus Walleij enum uart_pm_state pm_state; 1624ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1625ab4382d2SGreg Kroah-Hartman char stat_buf[32]; 1626ab4382d2SGreg Kroah-Hartman unsigned int status; 1627ab4382d2SGreg Kroah-Hartman int mmio; 1628ab4382d2SGreg Kroah-Hartman 1629ab4382d2SGreg Kroah-Hartman if (!uport) 1630ab4382d2SGreg Kroah-Hartman return; 1631ab4382d2SGreg Kroah-Hartman 1632ab4382d2SGreg Kroah-Hartman mmio = uport->iotype >= UPIO_MEM; 1633ab4382d2SGreg Kroah-Hartman seq_printf(m, "%d: uart:%s %s%08llX irq:%d", 1634ab4382d2SGreg Kroah-Hartman uport->line, uart_type(uport), 1635ab4382d2SGreg Kroah-Hartman mmio ? "mmio:0x" : "port:", 1636ab4382d2SGreg Kroah-Hartman mmio ? (unsigned long long)uport->mapbase 1637ab4382d2SGreg Kroah-Hartman : (unsigned long long)uport->iobase, 1638ab4382d2SGreg Kroah-Hartman uport->irq); 1639ab4382d2SGreg Kroah-Hartman 1640ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) { 1641ab4382d2SGreg Kroah-Hartman seq_putc(m, '\n'); 1642ab4382d2SGreg Kroah-Hartman return; 1643ab4382d2SGreg Kroah-Hartman } 1644ab4382d2SGreg Kroah-Hartman 1645ab4382d2SGreg Kroah-Hartman if (capable(CAP_SYS_ADMIN)) { 1646ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1647ab4382d2SGreg Kroah-Hartman pm_state = state->pm_state; 16486f538fe3SLinus Walleij if (pm_state != UART_PM_STATE_ON) 16496f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 1650ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1651ab4382d2SGreg Kroah-Hartman status = uport->ops->get_mctrl(uport); 1652ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 16536f538fe3SLinus Walleij if (pm_state != UART_PM_STATE_ON) 1654ab4382d2SGreg Kroah-Hartman uart_change_pm(state, pm_state); 1655ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1656ab4382d2SGreg Kroah-Hartman 1657ab4382d2SGreg Kroah-Hartman seq_printf(m, " tx:%d rx:%d", 1658ab4382d2SGreg Kroah-Hartman uport->icount.tx, uport->icount.rx); 1659ab4382d2SGreg Kroah-Hartman if (uport->icount.frame) 1660ab4382d2SGreg Kroah-Hartman seq_printf(m, " fe:%d", 1661ab4382d2SGreg Kroah-Hartman uport->icount.frame); 1662ab4382d2SGreg Kroah-Hartman if (uport->icount.parity) 1663ab4382d2SGreg Kroah-Hartman seq_printf(m, " pe:%d", 1664ab4382d2SGreg Kroah-Hartman uport->icount.parity); 1665ab4382d2SGreg Kroah-Hartman if (uport->icount.brk) 1666ab4382d2SGreg Kroah-Hartman seq_printf(m, " brk:%d", 1667ab4382d2SGreg Kroah-Hartman uport->icount.brk); 1668ab4382d2SGreg Kroah-Hartman if (uport->icount.overrun) 1669ab4382d2SGreg Kroah-Hartman seq_printf(m, " oe:%d", 1670ab4382d2SGreg Kroah-Hartman uport->icount.overrun); 1671ab4382d2SGreg Kroah-Hartman 1672ab4382d2SGreg Kroah-Hartman #define INFOBIT(bit, str) \ 1673ab4382d2SGreg Kroah-Hartman if (uport->mctrl & (bit)) \ 1674ab4382d2SGreg Kroah-Hartman strncat(stat_buf, (str), sizeof(stat_buf) - \ 1675ab4382d2SGreg Kroah-Hartman strlen(stat_buf) - 2) 1676ab4382d2SGreg Kroah-Hartman #define STATBIT(bit, str) \ 1677ab4382d2SGreg Kroah-Hartman if (status & (bit)) \ 1678ab4382d2SGreg Kroah-Hartman strncat(stat_buf, (str), sizeof(stat_buf) - \ 1679ab4382d2SGreg Kroah-Hartman strlen(stat_buf) - 2) 1680ab4382d2SGreg Kroah-Hartman 1681ab4382d2SGreg Kroah-Hartman stat_buf[0] = '\0'; 1682ab4382d2SGreg Kroah-Hartman stat_buf[1] = '\0'; 1683ab4382d2SGreg Kroah-Hartman INFOBIT(TIOCM_RTS, "|RTS"); 1684ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_CTS, "|CTS"); 1685ab4382d2SGreg Kroah-Hartman INFOBIT(TIOCM_DTR, "|DTR"); 1686ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_DSR, "|DSR"); 1687ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_CAR, "|CD"); 1688ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_RNG, "|RI"); 1689ab4382d2SGreg Kroah-Hartman if (stat_buf[0]) 1690ab4382d2SGreg Kroah-Hartman stat_buf[0] = ' '; 1691ab4382d2SGreg Kroah-Hartman 1692ab4382d2SGreg Kroah-Hartman seq_puts(m, stat_buf); 1693ab4382d2SGreg Kroah-Hartman } 1694ab4382d2SGreg Kroah-Hartman seq_putc(m, '\n'); 1695ab4382d2SGreg Kroah-Hartman #undef STATBIT 1696ab4382d2SGreg Kroah-Hartman #undef INFOBIT 1697ab4382d2SGreg Kroah-Hartman } 1698ab4382d2SGreg Kroah-Hartman 1699ab4382d2SGreg Kroah-Hartman static int uart_proc_show(struct seq_file *m, void *v) 1700ab4382d2SGreg Kroah-Hartman { 1701ab4382d2SGreg Kroah-Hartman struct tty_driver *ttydrv = m->private; 1702ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = ttydrv->driver_state; 1703ab4382d2SGreg Kroah-Hartman int i; 1704ab4382d2SGreg Kroah-Hartman 1705ab4382d2SGreg Kroah-Hartman seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n", 1706ab4382d2SGreg Kroah-Hartman "", "", ""); 1707ab4382d2SGreg Kroah-Hartman for (i = 0; i < drv->nr; i++) 1708ab4382d2SGreg Kroah-Hartman uart_line_info(m, drv, i); 1709ab4382d2SGreg Kroah-Hartman return 0; 1710ab4382d2SGreg Kroah-Hartman } 1711ab4382d2SGreg Kroah-Hartman 1712ab4382d2SGreg Kroah-Hartman static int uart_proc_open(struct inode *inode, struct file *file) 1713ab4382d2SGreg Kroah-Hartman { 1714ab4382d2SGreg Kroah-Hartman return single_open(file, uart_proc_show, PDE(inode)->data); 1715ab4382d2SGreg Kroah-Hartman } 1716ab4382d2SGreg Kroah-Hartman 1717ab4382d2SGreg Kroah-Hartman static const struct file_operations uart_proc_fops = { 1718ab4382d2SGreg Kroah-Hartman .owner = THIS_MODULE, 1719ab4382d2SGreg Kroah-Hartman .open = uart_proc_open, 1720ab4382d2SGreg Kroah-Hartman .read = seq_read, 1721ab4382d2SGreg Kroah-Hartman .llseek = seq_lseek, 1722ab4382d2SGreg Kroah-Hartman .release = single_release, 1723ab4382d2SGreg Kroah-Hartman }; 1724ab4382d2SGreg Kroah-Hartman #endif 1725ab4382d2SGreg Kroah-Hartman 1726ab4382d2SGreg Kroah-Hartman #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL) 1727ab4382d2SGreg Kroah-Hartman /* 1728ab4382d2SGreg Kroah-Hartman * uart_console_write - write a console message to a serial port 1729ab4382d2SGreg Kroah-Hartman * @port: the port to write the message 1730ab4382d2SGreg Kroah-Hartman * @s: array of characters 1731ab4382d2SGreg Kroah-Hartman * @count: number of characters in string to write 1732ab4382d2SGreg Kroah-Hartman * @write: function to write character to port 1733ab4382d2SGreg Kroah-Hartman */ 1734ab4382d2SGreg Kroah-Hartman void uart_console_write(struct uart_port *port, const char *s, 1735ab4382d2SGreg Kroah-Hartman unsigned int count, 1736ab4382d2SGreg Kroah-Hartman void (*putchar)(struct uart_port *, int)) 1737ab4382d2SGreg Kroah-Hartman { 1738ab4382d2SGreg Kroah-Hartman unsigned int i; 1739ab4382d2SGreg Kroah-Hartman 1740ab4382d2SGreg Kroah-Hartman for (i = 0; i < count; i++, s++) { 1741ab4382d2SGreg Kroah-Hartman if (*s == '\n') 1742ab4382d2SGreg Kroah-Hartman putchar(port, '\r'); 1743ab4382d2SGreg Kroah-Hartman putchar(port, *s); 1744ab4382d2SGreg Kroah-Hartman } 1745ab4382d2SGreg Kroah-Hartman } 1746ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_console_write); 1747ab4382d2SGreg Kroah-Hartman 1748ab4382d2SGreg Kroah-Hartman /* 1749ab4382d2SGreg Kroah-Hartman * Check whether an invalid uart number has been specified, and 1750ab4382d2SGreg Kroah-Hartman * if so, search for the first available port that does have 1751ab4382d2SGreg Kroah-Hartman * console support. 1752ab4382d2SGreg Kroah-Hartman */ 1753ab4382d2SGreg Kroah-Hartman struct uart_port * __init 1754ab4382d2SGreg Kroah-Hartman uart_get_console(struct uart_port *ports, int nr, struct console *co) 1755ab4382d2SGreg Kroah-Hartman { 1756ab4382d2SGreg Kroah-Hartman int idx = co->index; 1757ab4382d2SGreg Kroah-Hartman 1758ab4382d2SGreg Kroah-Hartman if (idx < 0 || idx >= nr || (ports[idx].iobase == 0 && 1759ab4382d2SGreg Kroah-Hartman ports[idx].membase == NULL)) 1760ab4382d2SGreg Kroah-Hartman for (idx = 0; idx < nr; idx++) 1761ab4382d2SGreg Kroah-Hartman if (ports[idx].iobase != 0 || 1762ab4382d2SGreg Kroah-Hartman ports[idx].membase != NULL) 1763ab4382d2SGreg Kroah-Hartman break; 1764ab4382d2SGreg Kroah-Hartman 1765ab4382d2SGreg Kroah-Hartman co->index = idx; 1766ab4382d2SGreg Kroah-Hartman 1767ab4382d2SGreg Kroah-Hartman return ports + idx; 1768ab4382d2SGreg Kroah-Hartman } 1769ab4382d2SGreg Kroah-Hartman 1770ab4382d2SGreg Kroah-Hartman /** 1771ab4382d2SGreg Kroah-Hartman * uart_parse_options - Parse serial port baud/parity/bits/flow contro. 1772ab4382d2SGreg Kroah-Hartman * @options: pointer to option string 1773ab4382d2SGreg Kroah-Hartman * @baud: pointer to an 'int' variable for the baud rate. 1774ab4382d2SGreg Kroah-Hartman * @parity: pointer to an 'int' variable for the parity. 1775ab4382d2SGreg Kroah-Hartman * @bits: pointer to an 'int' variable for the number of data bits. 1776ab4382d2SGreg Kroah-Hartman * @flow: pointer to an 'int' variable for the flow control character. 1777ab4382d2SGreg Kroah-Hartman * 1778ab4382d2SGreg Kroah-Hartman * uart_parse_options decodes a string containing the serial console 1779ab4382d2SGreg Kroah-Hartman * options. The format of the string is <baud><parity><bits><flow>, 1780ab4382d2SGreg Kroah-Hartman * eg: 115200n8r 1781ab4382d2SGreg Kroah-Hartman */ 1782ab4382d2SGreg Kroah-Hartman void 1783ab4382d2SGreg Kroah-Hartman uart_parse_options(char *options, int *baud, int *parity, int *bits, int *flow) 1784ab4382d2SGreg Kroah-Hartman { 1785ab4382d2SGreg Kroah-Hartman char *s = options; 1786ab4382d2SGreg Kroah-Hartman 1787ab4382d2SGreg Kroah-Hartman *baud = simple_strtoul(s, NULL, 10); 1788ab4382d2SGreg Kroah-Hartman while (*s >= '0' && *s <= '9') 1789ab4382d2SGreg Kroah-Hartman s++; 1790ab4382d2SGreg Kroah-Hartman if (*s) 1791ab4382d2SGreg Kroah-Hartman *parity = *s++; 1792ab4382d2SGreg Kroah-Hartman if (*s) 1793ab4382d2SGreg Kroah-Hartman *bits = *s++ - '0'; 1794ab4382d2SGreg Kroah-Hartman if (*s) 1795ab4382d2SGreg Kroah-Hartman *flow = *s; 1796ab4382d2SGreg Kroah-Hartman } 1797ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_parse_options); 1798ab4382d2SGreg Kroah-Hartman 1799ab4382d2SGreg Kroah-Hartman struct baud_rates { 1800ab4382d2SGreg Kroah-Hartman unsigned int rate; 1801ab4382d2SGreg Kroah-Hartman unsigned int cflag; 1802ab4382d2SGreg Kroah-Hartman }; 1803ab4382d2SGreg Kroah-Hartman 1804ab4382d2SGreg Kroah-Hartman static const struct baud_rates baud_rates[] = { 1805ab4382d2SGreg Kroah-Hartman { 921600, B921600 }, 1806ab4382d2SGreg Kroah-Hartman { 460800, B460800 }, 1807ab4382d2SGreg Kroah-Hartman { 230400, B230400 }, 1808ab4382d2SGreg Kroah-Hartman { 115200, B115200 }, 1809ab4382d2SGreg Kroah-Hartman { 57600, B57600 }, 1810ab4382d2SGreg Kroah-Hartman { 38400, B38400 }, 1811ab4382d2SGreg Kroah-Hartman { 19200, B19200 }, 1812ab4382d2SGreg Kroah-Hartman { 9600, B9600 }, 1813ab4382d2SGreg Kroah-Hartman { 4800, B4800 }, 1814ab4382d2SGreg Kroah-Hartman { 2400, B2400 }, 1815ab4382d2SGreg Kroah-Hartman { 1200, B1200 }, 1816ab4382d2SGreg Kroah-Hartman { 0, B38400 } 1817ab4382d2SGreg Kroah-Hartman }; 1818ab4382d2SGreg Kroah-Hartman 1819ab4382d2SGreg Kroah-Hartman /** 1820ab4382d2SGreg Kroah-Hartman * uart_set_options - setup the serial console parameters 1821ab4382d2SGreg Kroah-Hartman * @port: pointer to the serial ports uart_port structure 1822ab4382d2SGreg Kroah-Hartman * @co: console pointer 1823ab4382d2SGreg Kroah-Hartman * @baud: baud rate 1824ab4382d2SGreg Kroah-Hartman * @parity: parity character - 'n' (none), 'o' (odd), 'e' (even) 1825ab4382d2SGreg Kroah-Hartman * @bits: number of data bits 1826ab4382d2SGreg Kroah-Hartman * @flow: flow control character - 'r' (rts) 1827ab4382d2SGreg Kroah-Hartman */ 1828ab4382d2SGreg Kroah-Hartman int 1829ab4382d2SGreg Kroah-Hartman uart_set_options(struct uart_port *port, struct console *co, 1830ab4382d2SGreg Kroah-Hartman int baud, int parity, int bits, int flow) 1831ab4382d2SGreg Kroah-Hartman { 1832ab4382d2SGreg Kroah-Hartman struct ktermios termios; 1833ab4382d2SGreg Kroah-Hartman static struct ktermios dummy; 1834ab4382d2SGreg Kroah-Hartman int i; 1835ab4382d2SGreg Kroah-Hartman 1836ab4382d2SGreg Kroah-Hartman /* 1837ab4382d2SGreg Kroah-Hartman * Ensure that the serial console lock is initialised 1838ab4382d2SGreg Kroah-Hartman * early. 1839ab4382d2SGreg Kroah-Hartman */ 1840ab4382d2SGreg Kroah-Hartman spin_lock_init(&port->lock); 1841ab4382d2SGreg Kroah-Hartman lockdep_set_class(&port->lock, &port_lock_key); 1842ab4382d2SGreg Kroah-Hartman 1843ab4382d2SGreg Kroah-Hartman memset(&termios, 0, sizeof(struct ktermios)); 1844ab4382d2SGreg Kroah-Hartman 1845ab4382d2SGreg Kroah-Hartman termios.c_cflag = CREAD | HUPCL | CLOCAL; 1846ab4382d2SGreg Kroah-Hartman 1847ab4382d2SGreg Kroah-Hartman /* 1848ab4382d2SGreg Kroah-Hartman * Construct a cflag setting. 1849ab4382d2SGreg Kroah-Hartman */ 1850ab4382d2SGreg Kroah-Hartman for (i = 0; baud_rates[i].rate; i++) 1851ab4382d2SGreg Kroah-Hartman if (baud_rates[i].rate <= baud) 1852ab4382d2SGreg Kroah-Hartman break; 1853ab4382d2SGreg Kroah-Hartman 1854ab4382d2SGreg Kroah-Hartman termios.c_cflag |= baud_rates[i].cflag; 1855ab4382d2SGreg Kroah-Hartman 1856ab4382d2SGreg Kroah-Hartman if (bits == 7) 1857ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CS7; 1858ab4382d2SGreg Kroah-Hartman else 1859ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CS8; 1860ab4382d2SGreg Kroah-Hartman 1861ab4382d2SGreg Kroah-Hartman switch (parity) { 1862ab4382d2SGreg Kroah-Hartman case 'o': case 'O': 1863ab4382d2SGreg Kroah-Hartman termios.c_cflag |= PARODD; 1864ab4382d2SGreg Kroah-Hartman /*fall through*/ 1865ab4382d2SGreg Kroah-Hartman case 'e': case 'E': 1866ab4382d2SGreg Kroah-Hartman termios.c_cflag |= PARENB; 1867ab4382d2SGreg Kroah-Hartman break; 1868ab4382d2SGreg Kroah-Hartman } 1869ab4382d2SGreg Kroah-Hartman 1870ab4382d2SGreg Kroah-Hartman if (flow == 'r') 1871ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CRTSCTS; 1872ab4382d2SGreg Kroah-Hartman 1873ab4382d2SGreg Kroah-Hartman /* 1874ab4382d2SGreg Kroah-Hartman * some uarts on other side don't support no flow control. 1875ab4382d2SGreg Kroah-Hartman * So we set * DTR in host uart to make them happy 1876ab4382d2SGreg Kroah-Hartman */ 1877ab4382d2SGreg Kroah-Hartman port->mctrl |= TIOCM_DTR; 1878ab4382d2SGreg Kroah-Hartman 1879ab4382d2SGreg Kroah-Hartman port->ops->set_termios(port, &termios, &dummy); 1880ab4382d2SGreg Kroah-Hartman /* 1881ab4382d2SGreg Kroah-Hartman * Allow the setting of the UART parameters with a NULL console 1882ab4382d2SGreg Kroah-Hartman * too: 1883ab4382d2SGreg Kroah-Hartman */ 1884ab4382d2SGreg Kroah-Hartman if (co) 1885ab4382d2SGreg Kroah-Hartman co->cflag = termios.c_cflag; 1886ab4382d2SGreg Kroah-Hartman 1887ab4382d2SGreg Kroah-Hartman return 0; 1888ab4382d2SGreg Kroah-Hartman } 1889ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_set_options); 1890ab4382d2SGreg Kroah-Hartman #endif /* CONFIG_SERIAL_CORE_CONSOLE */ 1891ab4382d2SGreg Kroah-Hartman 1892cf75525fSJiri Slaby /** 1893cf75525fSJiri Slaby * uart_change_pm - set power state of the port 1894cf75525fSJiri Slaby * 1895cf75525fSJiri Slaby * @state: port descriptor 1896cf75525fSJiri Slaby * @pm_state: new state 1897cf75525fSJiri Slaby * 1898cf75525fSJiri Slaby * Locking: port->mutex has to be held 1899cf75525fSJiri Slaby */ 19006f538fe3SLinus Walleij static void uart_change_pm(struct uart_state *state, 19016f538fe3SLinus Walleij enum uart_pm_state pm_state) 1902ab4382d2SGreg Kroah-Hartman { 1903ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 1904ab4382d2SGreg Kroah-Hartman 1905ab4382d2SGreg Kroah-Hartman if (state->pm_state != pm_state) { 1906ab4382d2SGreg Kroah-Hartman if (port->ops->pm) 1907ab4382d2SGreg Kroah-Hartman port->ops->pm(port, pm_state, state->pm_state); 1908ab4382d2SGreg Kroah-Hartman state->pm_state = pm_state; 1909ab4382d2SGreg Kroah-Hartman } 1910ab4382d2SGreg Kroah-Hartman } 1911ab4382d2SGreg Kroah-Hartman 1912ab4382d2SGreg Kroah-Hartman struct uart_match { 1913ab4382d2SGreg Kroah-Hartman struct uart_port *port; 1914ab4382d2SGreg Kroah-Hartman struct uart_driver *driver; 1915ab4382d2SGreg Kroah-Hartman }; 1916ab4382d2SGreg Kroah-Hartman 1917ab4382d2SGreg Kroah-Hartman static int serial_match_port(struct device *dev, void *data) 1918ab4382d2SGreg Kroah-Hartman { 1919ab4382d2SGreg Kroah-Hartman struct uart_match *match = data; 1920ab4382d2SGreg Kroah-Hartman struct tty_driver *tty_drv = match->driver->tty_driver; 1921ab4382d2SGreg Kroah-Hartman dev_t devt = MKDEV(tty_drv->major, tty_drv->minor_start) + 1922ab4382d2SGreg Kroah-Hartman match->port->line; 1923ab4382d2SGreg Kroah-Hartman 1924ab4382d2SGreg Kroah-Hartman return dev->devt == devt; /* Actually, only one tty per port */ 1925ab4382d2SGreg Kroah-Hartman } 1926ab4382d2SGreg Kroah-Hartman 1927ab4382d2SGreg Kroah-Hartman int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport) 1928ab4382d2SGreg Kroah-Hartman { 1929ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 1930ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1931ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 1932ab4382d2SGreg Kroah-Hartman struct uart_match match = {uport, drv}; 1933ab4382d2SGreg Kroah-Hartman 1934ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1935ab4382d2SGreg Kroah-Hartman 1936ab4382d2SGreg Kroah-Hartman tty_dev = device_find_child(uport->dev, &match, serial_match_port); 1937ab4382d2SGreg Kroah-Hartman if (device_may_wakeup(tty_dev)) { 1938ab4382d2SGreg Kroah-Hartman if (!enable_irq_wake(uport->irq)) 1939ab4382d2SGreg Kroah-Hartman uport->irq_wake = 1; 1940ab4382d2SGreg Kroah-Hartman put_device(tty_dev); 1941ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1942ab4382d2SGreg Kroah-Hartman return 0; 1943ab4382d2SGreg Kroah-Hartman } 1944ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) 1945ab4382d2SGreg Kroah-Hartman uport->suspended = 1; 1946ab4382d2SGreg Kroah-Hartman 1947ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_INITIALIZED) { 1948ab4382d2SGreg Kroah-Hartman const struct uart_ops *ops = uport->ops; 1949ab4382d2SGreg Kroah-Hartman int tries; 1950ab4382d2SGreg Kroah-Hartman 1951ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) { 1952ab4382d2SGreg Kroah-Hartman set_bit(ASYNCB_SUSPENDED, &port->flags); 1953ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_INITIALIZED, &port->flags); 1954ab4382d2SGreg Kroah-Hartman 1955ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1956ab4382d2SGreg Kroah-Hartman ops->stop_tx(uport); 1957ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, 0); 1958ab4382d2SGreg Kroah-Hartman ops->stop_rx(uport); 1959ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1960ab4382d2SGreg Kroah-Hartman } 1961ab4382d2SGreg Kroah-Hartman 1962ab4382d2SGreg Kroah-Hartman /* 1963ab4382d2SGreg Kroah-Hartman * Wait for the transmitter to empty. 1964ab4382d2SGreg Kroah-Hartman */ 1965ab4382d2SGreg Kroah-Hartman for (tries = 3; !ops->tx_empty(uport) && tries; tries--) 1966ab4382d2SGreg Kroah-Hartman msleep(10); 1967ab4382d2SGreg Kroah-Hartman if (!tries) 1968ab4382d2SGreg Kroah-Hartman printk(KERN_ERR "%s%s%s%d: Unable to drain " 1969ab4382d2SGreg Kroah-Hartman "transmitter\n", 1970ab4382d2SGreg Kroah-Hartman uport->dev ? dev_name(uport->dev) : "", 1971ab4382d2SGreg Kroah-Hartman uport->dev ? ": " : "", 1972ab4382d2SGreg Kroah-Hartman drv->dev_name, 1973ab4382d2SGreg Kroah-Hartman drv->tty_driver->name_base + uport->line); 1974ab4382d2SGreg Kroah-Hartman 1975ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) 1976ab4382d2SGreg Kroah-Hartman ops->shutdown(uport); 1977ab4382d2SGreg Kroah-Hartman } 1978ab4382d2SGreg Kroah-Hartman 1979ab4382d2SGreg Kroah-Hartman /* 1980ab4382d2SGreg Kroah-Hartman * Disable the console device before suspending. 1981ab4382d2SGreg Kroah-Hartman */ 1982ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled && uart_console(uport)) 1983ab4382d2SGreg Kroah-Hartman console_stop(uport->cons); 1984ab4382d2SGreg Kroah-Hartman 1985ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) 19866f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_OFF); 1987ab4382d2SGreg Kroah-Hartman 1988ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1989ab4382d2SGreg Kroah-Hartman 1990ab4382d2SGreg Kroah-Hartman return 0; 1991ab4382d2SGreg Kroah-Hartman } 1992ab4382d2SGreg Kroah-Hartman 1993ab4382d2SGreg Kroah-Hartman int uart_resume_port(struct uart_driver *drv, struct uart_port *uport) 1994ab4382d2SGreg Kroah-Hartman { 1995ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 1996ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1997ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 1998ab4382d2SGreg Kroah-Hartman struct uart_match match = {uport, drv}; 1999ab4382d2SGreg Kroah-Hartman struct ktermios termios; 2000ab4382d2SGreg Kroah-Hartman 2001ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2002ab4382d2SGreg Kroah-Hartman 2003ab4382d2SGreg Kroah-Hartman tty_dev = device_find_child(uport->dev, &match, serial_match_port); 2004ab4382d2SGreg Kroah-Hartman if (!uport->suspended && device_may_wakeup(tty_dev)) { 2005ab4382d2SGreg Kroah-Hartman if (uport->irq_wake) { 2006ab4382d2SGreg Kroah-Hartman disable_irq_wake(uport->irq); 2007ab4382d2SGreg Kroah-Hartman uport->irq_wake = 0; 2008ab4382d2SGreg Kroah-Hartman } 2009ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2010ab4382d2SGreg Kroah-Hartman return 0; 2011ab4382d2SGreg Kroah-Hartman } 2012ab4382d2SGreg Kroah-Hartman uport->suspended = 0; 2013ab4382d2SGreg Kroah-Hartman 2014ab4382d2SGreg Kroah-Hartman /* 2015ab4382d2SGreg Kroah-Hartman * Re-enable the console device after suspending. 2016ab4382d2SGreg Kroah-Hartman */ 20175933a161SYin Kangkai if (uart_console(uport)) { 2018ab4382d2SGreg Kroah-Hartman /* 2019ab4382d2SGreg Kroah-Hartman * First try to use the console cflag setting. 2020ab4382d2SGreg Kroah-Hartman */ 2021ab4382d2SGreg Kroah-Hartman memset(&termios, 0, sizeof(struct ktermios)); 2022ab4382d2SGreg Kroah-Hartman termios.c_cflag = uport->cons->cflag; 2023ab4382d2SGreg Kroah-Hartman 2024ab4382d2SGreg Kroah-Hartman /* 2025ab4382d2SGreg Kroah-Hartman * If that's unset, use the tty termios setting. 2026ab4382d2SGreg Kroah-Hartman */ 2027adc8d746SAlan Cox if (port->tty && termios.c_cflag == 0) 2028adc8d746SAlan Cox termios = port->tty->termios; 2029ab4382d2SGreg Kroah-Hartman 203094abc56fSNing Jiang if (console_suspend_enabled) 20316f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2032ab4382d2SGreg Kroah-Hartman uport->ops->set_termios(uport, &termios, NULL); 20335933a161SYin Kangkai if (console_suspend_enabled) 2034ab4382d2SGreg Kroah-Hartman console_start(uport->cons); 2035ab4382d2SGreg Kroah-Hartman } 2036ab4382d2SGreg Kroah-Hartman 2037ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_SUSPENDED) { 2038ab4382d2SGreg Kroah-Hartman const struct uart_ops *ops = uport->ops; 2039ab4382d2SGreg Kroah-Hartman int ret; 2040ab4382d2SGreg Kroah-Hartman 20416f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2042ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 2043ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, 0); 2044ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2045ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) { 2046ab4382d2SGreg Kroah-Hartman /* Protected by port mutex for now */ 2047ab4382d2SGreg Kroah-Hartman struct tty_struct *tty = port->tty; 2048ab4382d2SGreg Kroah-Hartman ret = ops->startup(uport); 2049ab4382d2SGreg Kroah-Hartman if (ret == 0) { 2050ab4382d2SGreg Kroah-Hartman if (tty) 2051ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 2052ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 2053ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, uport->mctrl); 2054ab4382d2SGreg Kroah-Hartman ops->start_tx(uport); 2055ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2056ab4382d2SGreg Kroah-Hartman set_bit(ASYNCB_INITIALIZED, &port->flags); 2057ab4382d2SGreg Kroah-Hartman } else { 2058ab4382d2SGreg Kroah-Hartman /* 2059ab4382d2SGreg Kroah-Hartman * Failed to resume - maybe hardware went away? 2060ab4382d2SGreg Kroah-Hartman * Clear the "initialized" flag so we won't try 2061ab4382d2SGreg Kroah-Hartman * to call the low level drivers shutdown method. 2062ab4382d2SGreg Kroah-Hartman */ 2063ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 2064ab4382d2SGreg Kroah-Hartman } 2065ab4382d2SGreg Kroah-Hartman } 2066ab4382d2SGreg Kroah-Hartman 2067ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_SUSPENDED, &port->flags); 2068ab4382d2SGreg Kroah-Hartman } 2069ab4382d2SGreg Kroah-Hartman 2070ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2071ab4382d2SGreg Kroah-Hartman 2072ab4382d2SGreg Kroah-Hartman return 0; 2073ab4382d2SGreg Kroah-Hartman } 2074ab4382d2SGreg Kroah-Hartman 2075ab4382d2SGreg Kroah-Hartman static inline void 2076ab4382d2SGreg Kroah-Hartman uart_report_port(struct uart_driver *drv, struct uart_port *port) 2077ab4382d2SGreg Kroah-Hartman { 2078ab4382d2SGreg Kroah-Hartman char address[64]; 2079ab4382d2SGreg Kroah-Hartman 2080ab4382d2SGreg Kroah-Hartman switch (port->iotype) { 2081ab4382d2SGreg Kroah-Hartman case UPIO_PORT: 2082ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), "I/O 0x%lx", port->iobase); 2083ab4382d2SGreg Kroah-Hartman break; 2084ab4382d2SGreg Kroah-Hartman case UPIO_HUB6: 2085ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), 2086ab4382d2SGreg Kroah-Hartman "I/O 0x%lx offset 0x%x", port->iobase, port->hub6); 2087ab4382d2SGreg Kroah-Hartman break; 2088ab4382d2SGreg Kroah-Hartman case UPIO_MEM: 2089ab4382d2SGreg Kroah-Hartman case UPIO_MEM32: 2090ab4382d2SGreg Kroah-Hartman case UPIO_AU: 2091ab4382d2SGreg Kroah-Hartman case UPIO_TSI: 2092ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), 2093ab4382d2SGreg Kroah-Hartman "MMIO 0x%llx", (unsigned long long)port->mapbase); 2094ab4382d2SGreg Kroah-Hartman break; 2095ab4382d2SGreg Kroah-Hartman default: 2096ab4382d2SGreg Kroah-Hartman strlcpy(address, "*unknown*", sizeof(address)); 2097ab4382d2SGreg Kroah-Hartman break; 2098ab4382d2SGreg Kroah-Hartman } 2099ab4382d2SGreg Kroah-Hartman 2100ab4382d2SGreg Kroah-Hartman printk(KERN_INFO "%s%s%s%d at %s (irq = %d) is a %s\n", 2101ab4382d2SGreg Kroah-Hartman port->dev ? dev_name(port->dev) : "", 2102ab4382d2SGreg Kroah-Hartman port->dev ? ": " : "", 2103ab4382d2SGreg Kroah-Hartman drv->dev_name, 2104ab4382d2SGreg Kroah-Hartman drv->tty_driver->name_base + port->line, 2105ab4382d2SGreg Kroah-Hartman address, port->irq, uart_type(port)); 2106ab4382d2SGreg Kroah-Hartman } 2107ab4382d2SGreg Kroah-Hartman 2108ab4382d2SGreg Kroah-Hartman static void 2109ab4382d2SGreg Kroah-Hartman uart_configure_port(struct uart_driver *drv, struct uart_state *state, 2110ab4382d2SGreg Kroah-Hartman struct uart_port *port) 2111ab4382d2SGreg Kroah-Hartman { 2112ab4382d2SGreg Kroah-Hartman unsigned int flags; 2113ab4382d2SGreg Kroah-Hartman 2114ab4382d2SGreg Kroah-Hartman /* 2115ab4382d2SGreg Kroah-Hartman * If there isn't a port here, don't do anything further. 2116ab4382d2SGreg Kroah-Hartman */ 2117ab4382d2SGreg Kroah-Hartman if (!port->iobase && !port->mapbase && !port->membase) 2118ab4382d2SGreg Kroah-Hartman return; 2119ab4382d2SGreg Kroah-Hartman 2120ab4382d2SGreg Kroah-Hartman /* 2121ab4382d2SGreg Kroah-Hartman * Now do the auto configuration stuff. Note that config_port 2122ab4382d2SGreg Kroah-Hartman * is expected to claim the resources and map the port for us. 2123ab4382d2SGreg Kroah-Hartman */ 2124ab4382d2SGreg Kroah-Hartman flags = 0; 2125ab4382d2SGreg Kroah-Hartman if (port->flags & UPF_AUTO_IRQ) 2126ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_IRQ; 2127ab4382d2SGreg Kroah-Hartman if (port->flags & UPF_BOOT_AUTOCONF) { 2128ab4382d2SGreg Kroah-Hartman if (!(port->flags & UPF_FIXED_TYPE)) { 2129ab4382d2SGreg Kroah-Hartman port->type = PORT_UNKNOWN; 2130ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_TYPE; 2131ab4382d2SGreg Kroah-Hartman } 2132ab4382d2SGreg Kroah-Hartman port->ops->config_port(port, flags); 2133ab4382d2SGreg Kroah-Hartman } 2134ab4382d2SGreg Kroah-Hartman 2135ab4382d2SGreg Kroah-Hartman if (port->type != PORT_UNKNOWN) { 2136ab4382d2SGreg Kroah-Hartman unsigned long flags; 2137ab4382d2SGreg Kroah-Hartman 2138ab4382d2SGreg Kroah-Hartman uart_report_port(drv, port); 2139ab4382d2SGreg Kroah-Hartman 2140ab4382d2SGreg Kroah-Hartman /* Power up port for set_mctrl() */ 21416f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2142ab4382d2SGreg Kroah-Hartman 2143ab4382d2SGreg Kroah-Hartman /* 2144ab4382d2SGreg Kroah-Hartman * Ensure that the modem control lines are de-activated. 2145ab4382d2SGreg Kroah-Hartman * keep the DTR setting that is set in uart_set_options() 2146ab4382d2SGreg Kroah-Hartman * We probably don't need a spinlock around this, but 2147ab4382d2SGreg Kroah-Hartman */ 2148ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 2149ab4382d2SGreg Kroah-Hartman port->ops->set_mctrl(port, port->mctrl & TIOCM_DTR); 2150ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 2151ab4382d2SGreg Kroah-Hartman 2152ab4382d2SGreg Kroah-Hartman /* 2153ab4382d2SGreg Kroah-Hartman * If this driver supports console, and it hasn't been 2154ab4382d2SGreg Kroah-Hartman * successfully registered yet, try to re-register it. 2155ab4382d2SGreg Kroah-Hartman * It may be that the port was not available. 2156ab4382d2SGreg Kroah-Hartman */ 2157ab4382d2SGreg Kroah-Hartman if (port->cons && !(port->cons->flags & CON_ENABLED)) 2158ab4382d2SGreg Kroah-Hartman register_console(port->cons); 2159ab4382d2SGreg Kroah-Hartman 2160ab4382d2SGreg Kroah-Hartman /* 2161ab4382d2SGreg Kroah-Hartman * Power down all ports by default, except the 2162ab4382d2SGreg Kroah-Hartman * console if we have one. 2163ab4382d2SGreg Kroah-Hartman */ 2164ab4382d2SGreg Kroah-Hartman if (!uart_console(port)) 21656f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_OFF); 2166ab4382d2SGreg Kroah-Hartman } 2167ab4382d2SGreg Kroah-Hartman } 2168ab4382d2SGreg Kroah-Hartman 2169ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 2170ab4382d2SGreg Kroah-Hartman 2171ab4382d2SGreg Kroah-Hartman static int uart_poll_init(struct tty_driver *driver, int line, char *options) 2172ab4382d2SGreg Kroah-Hartman { 2173ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2174ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2175ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2176ab4382d2SGreg Kroah-Hartman int baud = 9600; 2177ab4382d2SGreg Kroah-Hartman int bits = 8; 2178ab4382d2SGreg Kroah-Hartman int parity = 'n'; 2179ab4382d2SGreg Kroah-Hartman int flow = 'n'; 2180c7f3e708SAnton Vorontsov int ret; 2181ab4382d2SGreg Kroah-Hartman 2182ab4382d2SGreg Kroah-Hartman if (!state || !state->uart_port) 2183ab4382d2SGreg Kroah-Hartman return -1; 2184ab4382d2SGreg Kroah-Hartman 2185ab4382d2SGreg Kroah-Hartman port = state->uart_port; 2186ab4382d2SGreg Kroah-Hartman if (!(port->ops->poll_get_char && port->ops->poll_put_char)) 2187ab4382d2SGreg Kroah-Hartman return -1; 2188ab4382d2SGreg Kroah-Hartman 2189c7f3e708SAnton Vorontsov if (port->ops->poll_init) { 2190c7f3e708SAnton Vorontsov struct tty_port *tport = &state->port; 2191c7f3e708SAnton Vorontsov 2192c7f3e708SAnton Vorontsov ret = 0; 2193c7f3e708SAnton Vorontsov mutex_lock(&tport->mutex); 2194c7f3e708SAnton Vorontsov /* 2195c7f3e708SAnton Vorontsov * We don't set ASYNCB_INITIALIZED as we only initialized the 2196c7f3e708SAnton Vorontsov * hw, e.g. state->xmit is still uninitialized. 2197c7f3e708SAnton Vorontsov */ 2198c7f3e708SAnton Vorontsov if (!test_bit(ASYNCB_INITIALIZED, &tport->flags)) 2199c7f3e708SAnton Vorontsov ret = port->ops->poll_init(port); 2200c7f3e708SAnton Vorontsov mutex_unlock(&tport->mutex); 2201c7f3e708SAnton Vorontsov if (ret) 2202c7f3e708SAnton Vorontsov return ret; 2203c7f3e708SAnton Vorontsov } 2204c7f3e708SAnton Vorontsov 2205ab4382d2SGreg Kroah-Hartman if (options) { 2206ab4382d2SGreg Kroah-Hartman uart_parse_options(options, &baud, &parity, &bits, &flow); 2207ab4382d2SGreg Kroah-Hartman return uart_set_options(port, NULL, baud, parity, bits, flow); 2208ab4382d2SGreg Kroah-Hartman } 2209ab4382d2SGreg Kroah-Hartman 2210ab4382d2SGreg Kroah-Hartman return 0; 2211ab4382d2SGreg Kroah-Hartman } 2212ab4382d2SGreg Kroah-Hartman 2213ab4382d2SGreg Kroah-Hartman static int uart_poll_get_char(struct tty_driver *driver, int line) 2214ab4382d2SGreg Kroah-Hartman { 2215ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2216ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2217ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2218ab4382d2SGreg Kroah-Hartman 2219ab4382d2SGreg Kroah-Hartman if (!state || !state->uart_port) 2220ab4382d2SGreg Kroah-Hartman return -1; 2221ab4382d2SGreg Kroah-Hartman 2222ab4382d2SGreg Kroah-Hartman port = state->uart_port; 2223ab4382d2SGreg Kroah-Hartman return port->ops->poll_get_char(port); 2224ab4382d2SGreg Kroah-Hartman } 2225ab4382d2SGreg Kroah-Hartman 2226ab4382d2SGreg Kroah-Hartman static void uart_poll_put_char(struct tty_driver *driver, int line, char ch) 2227ab4382d2SGreg Kroah-Hartman { 2228ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2229ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2230ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2231ab4382d2SGreg Kroah-Hartman 2232ab4382d2SGreg Kroah-Hartman if (!state || !state->uart_port) 2233ab4382d2SGreg Kroah-Hartman return; 2234ab4382d2SGreg Kroah-Hartman 2235ab4382d2SGreg Kroah-Hartman port = state->uart_port; 2236ab4382d2SGreg Kroah-Hartman port->ops->poll_put_char(port, ch); 2237ab4382d2SGreg Kroah-Hartman } 2238ab4382d2SGreg Kroah-Hartman #endif 2239ab4382d2SGreg Kroah-Hartman 2240ab4382d2SGreg Kroah-Hartman static const struct tty_operations uart_ops = { 2241ab4382d2SGreg Kroah-Hartman .open = uart_open, 2242ab4382d2SGreg Kroah-Hartman .close = uart_close, 2243ab4382d2SGreg Kroah-Hartman .write = uart_write, 2244ab4382d2SGreg Kroah-Hartman .put_char = uart_put_char, 2245ab4382d2SGreg Kroah-Hartman .flush_chars = uart_flush_chars, 2246ab4382d2SGreg Kroah-Hartman .write_room = uart_write_room, 2247ab4382d2SGreg Kroah-Hartman .chars_in_buffer= uart_chars_in_buffer, 2248ab4382d2SGreg Kroah-Hartman .flush_buffer = uart_flush_buffer, 2249ab4382d2SGreg Kroah-Hartman .ioctl = uart_ioctl, 2250ab4382d2SGreg Kroah-Hartman .throttle = uart_throttle, 2251ab4382d2SGreg Kroah-Hartman .unthrottle = uart_unthrottle, 2252ab4382d2SGreg Kroah-Hartman .send_xchar = uart_send_xchar, 2253ab4382d2SGreg Kroah-Hartman .set_termios = uart_set_termios, 2254ab4382d2SGreg Kroah-Hartman .set_ldisc = uart_set_ldisc, 2255ab4382d2SGreg Kroah-Hartman .stop = uart_stop, 2256ab4382d2SGreg Kroah-Hartman .start = uart_start, 2257ab4382d2SGreg Kroah-Hartman .hangup = uart_hangup, 2258ab4382d2SGreg Kroah-Hartman .break_ctl = uart_break_ctl, 2259ab4382d2SGreg Kroah-Hartman .wait_until_sent= uart_wait_until_sent, 2260ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_PROC_FS 2261ab4382d2SGreg Kroah-Hartman .proc_fops = &uart_proc_fops, 2262ab4382d2SGreg Kroah-Hartman #endif 2263ab4382d2SGreg Kroah-Hartman .tiocmget = uart_tiocmget, 2264ab4382d2SGreg Kroah-Hartman .tiocmset = uart_tiocmset, 2265ab4382d2SGreg Kroah-Hartman .get_icount = uart_get_icount, 2266ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 2267ab4382d2SGreg Kroah-Hartman .poll_init = uart_poll_init, 2268ab4382d2SGreg Kroah-Hartman .poll_get_char = uart_poll_get_char, 2269ab4382d2SGreg Kroah-Hartman .poll_put_char = uart_poll_put_char, 2270ab4382d2SGreg Kroah-Hartman #endif 2271ab4382d2SGreg Kroah-Hartman }; 2272ab4382d2SGreg Kroah-Hartman 2273ab4382d2SGreg Kroah-Hartman static const struct tty_port_operations uart_port_ops = { 22740b1db830SJiri Slaby .activate = uart_port_activate, 22750b1db830SJiri Slaby .shutdown = uart_port_shutdown, 2276ab4382d2SGreg Kroah-Hartman .carrier_raised = uart_carrier_raised, 2277ab4382d2SGreg Kroah-Hartman .dtr_rts = uart_dtr_rts, 2278ab4382d2SGreg Kroah-Hartman }; 2279ab4382d2SGreg Kroah-Hartman 2280ab4382d2SGreg Kroah-Hartman /** 2281ab4382d2SGreg Kroah-Hartman * uart_register_driver - register a driver with the uart core layer 2282ab4382d2SGreg Kroah-Hartman * @drv: low level driver structure 2283ab4382d2SGreg Kroah-Hartman * 2284ab4382d2SGreg Kroah-Hartman * Register a uart driver with the core driver. We in turn register 2285ab4382d2SGreg Kroah-Hartman * with the tty layer, and initialise the core driver per-port state. 2286ab4382d2SGreg Kroah-Hartman * 2287ab4382d2SGreg Kroah-Hartman * We have a proc file in /proc/tty/driver which is named after the 2288ab4382d2SGreg Kroah-Hartman * normal driver. 2289ab4382d2SGreg Kroah-Hartman * 2290ab4382d2SGreg Kroah-Hartman * drv->port should be NULL, and the per-port structures should be 2291ab4382d2SGreg Kroah-Hartman * registered using uart_add_one_port after this call has succeeded. 2292ab4382d2SGreg Kroah-Hartman */ 2293ab4382d2SGreg Kroah-Hartman int uart_register_driver(struct uart_driver *drv) 2294ab4382d2SGreg Kroah-Hartman { 2295ab4382d2SGreg Kroah-Hartman struct tty_driver *normal; 2296ab4382d2SGreg Kroah-Hartman int i, retval; 2297ab4382d2SGreg Kroah-Hartman 2298ab4382d2SGreg Kroah-Hartman BUG_ON(drv->state); 2299ab4382d2SGreg Kroah-Hartman 2300ab4382d2SGreg Kroah-Hartman /* 2301ab4382d2SGreg Kroah-Hartman * Maybe we should be using a slab cache for this, especially if 2302ab4382d2SGreg Kroah-Hartman * we have a large number of ports to handle. 2303ab4382d2SGreg Kroah-Hartman */ 2304ab4382d2SGreg Kroah-Hartman drv->state = kzalloc(sizeof(struct uart_state) * drv->nr, GFP_KERNEL); 2305ab4382d2SGreg Kroah-Hartman if (!drv->state) 2306ab4382d2SGreg Kroah-Hartman goto out; 2307ab4382d2SGreg Kroah-Hartman 2308ab4382d2SGreg Kroah-Hartman normal = alloc_tty_driver(drv->nr); 2309ab4382d2SGreg Kroah-Hartman if (!normal) 2310ab4382d2SGreg Kroah-Hartman goto out_kfree; 2311ab4382d2SGreg Kroah-Hartman 2312ab4382d2SGreg Kroah-Hartman drv->tty_driver = normal; 2313ab4382d2SGreg Kroah-Hartman 2314ab4382d2SGreg Kroah-Hartman normal->driver_name = drv->driver_name; 2315ab4382d2SGreg Kroah-Hartman normal->name = drv->dev_name; 2316ab4382d2SGreg Kroah-Hartman normal->major = drv->major; 2317ab4382d2SGreg Kroah-Hartman normal->minor_start = drv->minor; 2318ab4382d2SGreg Kroah-Hartman normal->type = TTY_DRIVER_TYPE_SERIAL; 2319ab4382d2SGreg Kroah-Hartman normal->subtype = SERIAL_TYPE_NORMAL; 2320ab4382d2SGreg Kroah-Hartman normal->init_termios = tty_std_termios; 2321ab4382d2SGreg Kroah-Hartman normal->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; 2322ab4382d2SGreg Kroah-Hartman normal->init_termios.c_ispeed = normal->init_termios.c_ospeed = 9600; 2323ab4382d2SGreg Kroah-Hartman normal->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; 2324ab4382d2SGreg Kroah-Hartman normal->driver_state = drv; 2325ab4382d2SGreg Kroah-Hartman tty_set_operations(normal, &uart_ops); 2326ab4382d2SGreg Kroah-Hartman 2327ab4382d2SGreg Kroah-Hartman /* 2328ab4382d2SGreg Kroah-Hartman * Initialise the UART state(s). 2329ab4382d2SGreg Kroah-Hartman */ 2330ab4382d2SGreg Kroah-Hartman for (i = 0; i < drv->nr; i++) { 2331ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + i; 2332ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2333ab4382d2SGreg Kroah-Hartman 2334ab4382d2SGreg Kroah-Hartman tty_port_init(port); 2335ab4382d2SGreg Kroah-Hartman port->ops = &uart_port_ops; 23364cb0fbfdSJiri Slaby port->close_delay = HZ / 2; /* .5 seconds */ 23374cb0fbfdSJiri Slaby port->closing_wait = 30 * HZ;/* 30 seconds */ 2338ab4382d2SGreg Kroah-Hartman } 2339ab4382d2SGreg Kroah-Hartman 2340ab4382d2SGreg Kroah-Hartman retval = tty_register_driver(normal); 2341ab4382d2SGreg Kroah-Hartman if (retval >= 0) 2342ab4382d2SGreg Kroah-Hartman return retval; 2343ab4382d2SGreg Kroah-Hartman 2344191c5f10SJiri Slaby for (i = 0; i < drv->nr; i++) 2345191c5f10SJiri Slaby tty_port_destroy(&drv->state[i].port); 2346ab4382d2SGreg Kroah-Hartman put_tty_driver(normal); 2347ab4382d2SGreg Kroah-Hartman out_kfree: 2348ab4382d2SGreg Kroah-Hartman kfree(drv->state); 2349ab4382d2SGreg Kroah-Hartman out: 2350ab4382d2SGreg Kroah-Hartman return -ENOMEM; 2351ab4382d2SGreg Kroah-Hartman } 2352ab4382d2SGreg Kroah-Hartman 2353ab4382d2SGreg Kroah-Hartman /** 2354ab4382d2SGreg Kroah-Hartman * uart_unregister_driver - remove a driver from the uart core layer 2355ab4382d2SGreg Kroah-Hartman * @drv: low level driver structure 2356ab4382d2SGreg Kroah-Hartman * 2357ab4382d2SGreg Kroah-Hartman * Remove all references to a driver from the core driver. The low 2358ab4382d2SGreg Kroah-Hartman * level driver must have removed all its ports via the 2359ab4382d2SGreg Kroah-Hartman * uart_remove_one_port() if it registered them with uart_add_one_port(). 2360ab4382d2SGreg Kroah-Hartman * (ie, drv->port == NULL) 2361ab4382d2SGreg Kroah-Hartman */ 2362ab4382d2SGreg Kroah-Hartman void uart_unregister_driver(struct uart_driver *drv) 2363ab4382d2SGreg Kroah-Hartman { 2364ab4382d2SGreg Kroah-Hartman struct tty_driver *p = drv->tty_driver; 2365191c5f10SJiri Slaby unsigned int i; 2366191c5f10SJiri Slaby 2367ab4382d2SGreg Kroah-Hartman tty_unregister_driver(p); 2368ab4382d2SGreg Kroah-Hartman put_tty_driver(p); 2369191c5f10SJiri Slaby for (i = 0; i < drv->nr; i++) 2370191c5f10SJiri Slaby tty_port_destroy(&drv->state[i].port); 2371ab4382d2SGreg Kroah-Hartman kfree(drv->state); 23721e66cdedSAlan Cox drv->state = NULL; 2373ab4382d2SGreg Kroah-Hartman drv->tty_driver = NULL; 2374ab4382d2SGreg Kroah-Hartman } 2375ab4382d2SGreg Kroah-Hartman 2376ab4382d2SGreg Kroah-Hartman struct tty_driver *uart_console_device(struct console *co, int *index) 2377ab4382d2SGreg Kroah-Hartman { 2378ab4382d2SGreg Kroah-Hartman struct uart_driver *p = co->data; 2379ab4382d2SGreg Kroah-Hartman *index = co->index; 2380ab4382d2SGreg Kroah-Hartman return p->tty_driver; 2381ab4382d2SGreg Kroah-Hartman } 2382ab4382d2SGreg Kroah-Hartman 23836915c0e4STomas Hlavacek static ssize_t uart_get_attr_uartclk(struct device *dev, 23846915c0e4STomas Hlavacek struct device_attribute *attr, char *buf) 23856915c0e4STomas Hlavacek { 2386bebe73e3SAlan Cox struct serial_struct tmp; 23876915c0e4STomas Hlavacek struct tty_port *port = dev_get_drvdata(dev); 2388b1b79916STomas Hlavacek 23899f109694SAlan Cox uart_get_info(port, &tmp); 2390bebe73e3SAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.baud_base * 16); 23916915c0e4STomas Hlavacek } 23926915c0e4STomas Hlavacek 2393373bac4cSAlan Cox static ssize_t uart_get_attr_type(struct device *dev, 2394373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2395373bac4cSAlan Cox { 2396373bac4cSAlan Cox struct serial_struct tmp; 2397373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2398373bac4cSAlan Cox 2399373bac4cSAlan Cox uart_get_info(port, &tmp); 2400373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.type); 2401373bac4cSAlan Cox } 2402373bac4cSAlan Cox static ssize_t uart_get_attr_line(struct device *dev, 2403373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2404373bac4cSAlan Cox { 2405373bac4cSAlan Cox struct serial_struct tmp; 2406373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2407373bac4cSAlan Cox 2408373bac4cSAlan Cox uart_get_info(port, &tmp); 2409373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.line); 2410373bac4cSAlan Cox } 2411373bac4cSAlan Cox 2412373bac4cSAlan Cox static ssize_t uart_get_attr_port(struct device *dev, 2413373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2414373bac4cSAlan Cox { 2415373bac4cSAlan Cox struct serial_struct tmp; 2416373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2417fd985e1dSAndrew Morton unsigned long ioaddr; 2418373bac4cSAlan Cox 2419373bac4cSAlan Cox uart_get_info(port, &tmp); 2420fd985e1dSAndrew Morton ioaddr = tmp.port; 2421fd985e1dSAndrew Morton if (HIGH_BITS_OFFSET) 2422fd985e1dSAndrew Morton ioaddr |= (unsigned long)tmp.port_high << HIGH_BITS_OFFSET; 2423fd985e1dSAndrew Morton return snprintf(buf, PAGE_SIZE, "0x%lX\n", ioaddr); 2424373bac4cSAlan Cox } 2425373bac4cSAlan Cox 2426373bac4cSAlan Cox static ssize_t uart_get_attr_irq(struct device *dev, 2427373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2428373bac4cSAlan Cox { 2429373bac4cSAlan Cox struct serial_struct tmp; 2430373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2431373bac4cSAlan Cox 2432373bac4cSAlan Cox uart_get_info(port, &tmp); 2433373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.irq); 2434373bac4cSAlan Cox } 2435373bac4cSAlan Cox 2436373bac4cSAlan Cox static ssize_t uart_get_attr_flags(struct device *dev, 2437373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2438373bac4cSAlan Cox { 2439373bac4cSAlan Cox struct serial_struct tmp; 2440373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2441373bac4cSAlan Cox 2442373bac4cSAlan Cox uart_get_info(port, &tmp); 2443373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "0x%X\n", tmp.flags); 2444373bac4cSAlan Cox } 2445373bac4cSAlan Cox 2446373bac4cSAlan Cox static ssize_t uart_get_attr_xmit_fifo_size(struct device *dev, 2447373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2448373bac4cSAlan Cox { 2449373bac4cSAlan Cox struct serial_struct tmp; 2450373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2451373bac4cSAlan Cox 2452373bac4cSAlan Cox uart_get_info(port, &tmp); 2453373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.xmit_fifo_size); 2454373bac4cSAlan Cox } 2455373bac4cSAlan Cox 2456373bac4cSAlan Cox 2457373bac4cSAlan Cox static ssize_t uart_get_attr_close_delay(struct device *dev, 2458373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2459373bac4cSAlan Cox { 2460373bac4cSAlan Cox struct serial_struct tmp; 2461373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2462373bac4cSAlan Cox 2463373bac4cSAlan Cox uart_get_info(port, &tmp); 2464373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.close_delay); 2465373bac4cSAlan Cox } 2466373bac4cSAlan Cox 2467373bac4cSAlan Cox 2468373bac4cSAlan Cox static ssize_t uart_get_attr_closing_wait(struct device *dev, 2469373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2470373bac4cSAlan Cox { 2471373bac4cSAlan Cox struct serial_struct tmp; 2472373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2473373bac4cSAlan Cox 2474373bac4cSAlan Cox uart_get_info(port, &tmp); 2475373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.closing_wait); 2476373bac4cSAlan Cox } 2477373bac4cSAlan Cox 2478373bac4cSAlan Cox static ssize_t uart_get_attr_custom_divisor(struct device *dev, 2479373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2480373bac4cSAlan Cox { 2481373bac4cSAlan Cox struct serial_struct tmp; 2482373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2483373bac4cSAlan Cox 2484373bac4cSAlan Cox uart_get_info(port, &tmp); 2485373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.custom_divisor); 2486373bac4cSAlan Cox } 2487373bac4cSAlan Cox 2488373bac4cSAlan Cox static ssize_t uart_get_attr_io_type(struct device *dev, 2489373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2490373bac4cSAlan Cox { 2491373bac4cSAlan Cox struct serial_struct tmp; 2492373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2493373bac4cSAlan Cox 2494373bac4cSAlan Cox uart_get_info(port, &tmp); 2495373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.io_type); 2496373bac4cSAlan Cox } 2497373bac4cSAlan Cox 2498373bac4cSAlan Cox static ssize_t uart_get_attr_iomem_base(struct device *dev, 2499373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2500373bac4cSAlan Cox { 2501373bac4cSAlan Cox struct serial_struct tmp; 2502373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2503373bac4cSAlan Cox 2504373bac4cSAlan Cox uart_get_info(port, &tmp); 2505373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "0x%lX\n", (unsigned long)tmp.iomem_base); 2506373bac4cSAlan Cox } 2507373bac4cSAlan Cox 2508373bac4cSAlan Cox static ssize_t uart_get_attr_iomem_reg_shift(struct device *dev, 2509373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2510373bac4cSAlan Cox { 2511373bac4cSAlan Cox struct serial_struct tmp; 2512373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2513373bac4cSAlan Cox 2514373bac4cSAlan Cox uart_get_info(port, &tmp); 2515373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.iomem_reg_shift); 2516373bac4cSAlan Cox } 2517373bac4cSAlan Cox 2518373bac4cSAlan Cox static DEVICE_ATTR(type, S_IRUSR | S_IRGRP, uart_get_attr_type, NULL); 2519373bac4cSAlan Cox static DEVICE_ATTR(line, S_IRUSR | S_IRGRP, uart_get_attr_line, NULL); 2520373bac4cSAlan Cox static DEVICE_ATTR(port, S_IRUSR | S_IRGRP, uart_get_attr_port, NULL); 2521373bac4cSAlan Cox static DEVICE_ATTR(irq, S_IRUSR | S_IRGRP, uart_get_attr_irq, NULL); 2522373bac4cSAlan Cox static DEVICE_ATTR(flags, S_IRUSR | S_IRGRP, uart_get_attr_flags, NULL); 2523373bac4cSAlan Cox static DEVICE_ATTR(xmit_fifo_size, S_IRUSR | S_IRGRP, uart_get_attr_xmit_fifo_size, NULL); 25246915c0e4STomas Hlavacek static DEVICE_ATTR(uartclk, S_IRUSR | S_IRGRP, uart_get_attr_uartclk, NULL); 2525373bac4cSAlan Cox static DEVICE_ATTR(close_delay, S_IRUSR | S_IRGRP, uart_get_attr_close_delay, NULL); 2526373bac4cSAlan Cox static DEVICE_ATTR(closing_wait, S_IRUSR | S_IRGRP, uart_get_attr_closing_wait, NULL); 2527373bac4cSAlan Cox static DEVICE_ATTR(custom_divisor, S_IRUSR | S_IRGRP, uart_get_attr_custom_divisor, NULL); 2528373bac4cSAlan Cox static DEVICE_ATTR(io_type, S_IRUSR | S_IRGRP, uart_get_attr_io_type, NULL); 2529373bac4cSAlan Cox static DEVICE_ATTR(iomem_base, S_IRUSR | S_IRGRP, uart_get_attr_iomem_base, NULL); 2530373bac4cSAlan Cox static DEVICE_ATTR(iomem_reg_shift, S_IRUSR | S_IRGRP, uart_get_attr_iomem_reg_shift, NULL); 25316915c0e4STomas Hlavacek 25326915c0e4STomas Hlavacek static struct attribute *tty_dev_attrs[] = { 2533373bac4cSAlan Cox &dev_attr_type.attr, 2534373bac4cSAlan Cox &dev_attr_line.attr, 2535373bac4cSAlan Cox &dev_attr_port.attr, 2536373bac4cSAlan Cox &dev_attr_irq.attr, 2537373bac4cSAlan Cox &dev_attr_flags.attr, 2538373bac4cSAlan Cox &dev_attr_xmit_fifo_size.attr, 25396915c0e4STomas Hlavacek &dev_attr_uartclk.attr, 2540373bac4cSAlan Cox &dev_attr_close_delay.attr, 2541373bac4cSAlan Cox &dev_attr_closing_wait.attr, 2542373bac4cSAlan Cox &dev_attr_custom_divisor.attr, 2543373bac4cSAlan Cox &dev_attr_io_type.attr, 2544373bac4cSAlan Cox &dev_attr_iomem_base.attr, 2545373bac4cSAlan Cox &dev_attr_iomem_reg_shift.attr, 25466915c0e4STomas Hlavacek NULL, 25476915c0e4STomas Hlavacek }; 25486915c0e4STomas Hlavacek 2549b1b79916STomas Hlavacek static const struct attribute_group tty_dev_attr_group = { 25506915c0e4STomas Hlavacek .attrs = tty_dev_attrs, 25516915c0e4STomas Hlavacek }; 25526915c0e4STomas Hlavacek 25536915c0e4STomas Hlavacek static const struct attribute_group *tty_dev_attr_groups[] = { 25546915c0e4STomas Hlavacek &tty_dev_attr_group, 25556915c0e4STomas Hlavacek NULL 25566915c0e4STomas Hlavacek }; 25576915c0e4STomas Hlavacek 25589f109694SAlan Cox 2559ab4382d2SGreg Kroah-Hartman /** 2560ab4382d2SGreg Kroah-Hartman * uart_add_one_port - attach a driver-defined port structure 2561ab4382d2SGreg Kroah-Hartman * @drv: pointer to the uart low level driver structure for this port 2562ab4382d2SGreg Kroah-Hartman * @uport: uart port structure to use for this port. 2563ab4382d2SGreg Kroah-Hartman * 2564ab4382d2SGreg Kroah-Hartman * This allows the driver to register its own uart_port structure 2565ab4382d2SGreg Kroah-Hartman * with the core driver. The main purpose is to allow the low 2566ab4382d2SGreg Kroah-Hartman * level uart drivers to expand uart_port, rather than having yet 2567ab4382d2SGreg Kroah-Hartman * more levels of structures. 2568ab4382d2SGreg Kroah-Hartman */ 2569ab4382d2SGreg Kroah-Hartman int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport) 2570ab4382d2SGreg Kroah-Hartman { 2571ab4382d2SGreg Kroah-Hartman struct uart_state *state; 2572ab4382d2SGreg Kroah-Hartman struct tty_port *port; 2573ab4382d2SGreg Kroah-Hartman int ret = 0; 2574ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 2575ab4382d2SGreg Kroah-Hartman 2576ab4382d2SGreg Kroah-Hartman BUG_ON(in_interrupt()); 2577ab4382d2SGreg Kroah-Hartman 2578ab4382d2SGreg Kroah-Hartman if (uport->line >= drv->nr) 2579ab4382d2SGreg Kroah-Hartman return -EINVAL; 2580ab4382d2SGreg Kroah-Hartman 2581ab4382d2SGreg Kroah-Hartman state = drv->state + uport->line; 2582ab4382d2SGreg Kroah-Hartman port = &state->port; 2583ab4382d2SGreg Kroah-Hartman 2584ab4382d2SGreg Kroah-Hartman mutex_lock(&port_mutex); 2585ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2586ab4382d2SGreg Kroah-Hartman if (state->uart_port) { 2587ab4382d2SGreg Kroah-Hartman ret = -EINVAL; 2588ab4382d2SGreg Kroah-Hartman goto out; 2589ab4382d2SGreg Kroah-Hartman } 2590ab4382d2SGreg Kroah-Hartman 2591ab4382d2SGreg Kroah-Hartman state->uart_port = uport; 25926f538fe3SLinus Walleij state->pm_state = UART_PM_STATE_UNDEFINED; 2593ab4382d2SGreg Kroah-Hartman 2594ab4382d2SGreg Kroah-Hartman uport->cons = drv->cons; 2595ab4382d2SGreg Kroah-Hartman uport->state = state; 2596ab4382d2SGreg Kroah-Hartman 2597ab4382d2SGreg Kroah-Hartman /* 2598ab4382d2SGreg Kroah-Hartman * If this port is a console, then the spinlock is already 2599ab4382d2SGreg Kroah-Hartman * initialised. 2600ab4382d2SGreg Kroah-Hartman */ 2601ab4382d2SGreg Kroah-Hartman if (!(uart_console(uport) && (uport->cons->flags & CON_ENABLED))) { 2602ab4382d2SGreg Kroah-Hartman spin_lock_init(&uport->lock); 2603ab4382d2SGreg Kroah-Hartman lockdep_set_class(&uport->lock, &port_lock_key); 2604ab4382d2SGreg Kroah-Hartman } 2605ab4382d2SGreg Kroah-Hartman 2606ab4382d2SGreg Kroah-Hartman uart_configure_port(drv, state, uport); 2607ab4382d2SGreg Kroah-Hartman 2608ab4382d2SGreg Kroah-Hartman /* 2609ab4382d2SGreg Kroah-Hartman * Register the port whether it's detected or not. This allows 2610ab4382d2SGreg Kroah-Hartman * setserial to be used to alter this ports parameters. 2611ab4382d2SGreg Kroah-Hartman */ 2612b1b79916STomas Hlavacek tty_dev = tty_port_register_device_attr(port, drv->tty_driver, 2613b1b79916STomas Hlavacek uport->line, uport->dev, port, tty_dev_attr_groups); 2614ab4382d2SGreg Kroah-Hartman if (likely(!IS_ERR(tty_dev))) { 261577359835SSimon Glass device_set_wakeup_capable(tty_dev, 1); 261677359835SSimon Glass } else { 2617ab4382d2SGreg Kroah-Hartman printk(KERN_ERR "Cannot register tty device on line %d\n", 2618ab4382d2SGreg Kroah-Hartman uport->line); 261977359835SSimon Glass } 2620ab4382d2SGreg Kroah-Hartman 2621ab4382d2SGreg Kroah-Hartman /* 2622ab4382d2SGreg Kroah-Hartman * Ensure UPF_DEAD is not set. 2623ab4382d2SGreg Kroah-Hartman */ 2624ab4382d2SGreg Kroah-Hartman uport->flags &= ~UPF_DEAD; 2625ab4382d2SGreg Kroah-Hartman 2626ab4382d2SGreg Kroah-Hartman out: 2627ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2628ab4382d2SGreg Kroah-Hartman mutex_unlock(&port_mutex); 2629ab4382d2SGreg Kroah-Hartman 2630ab4382d2SGreg Kroah-Hartman return ret; 2631ab4382d2SGreg Kroah-Hartman } 2632ab4382d2SGreg Kroah-Hartman 2633ab4382d2SGreg Kroah-Hartman /** 2634ab4382d2SGreg Kroah-Hartman * uart_remove_one_port - detach a driver defined port structure 2635ab4382d2SGreg Kroah-Hartman * @drv: pointer to the uart low level driver structure for this port 2636ab4382d2SGreg Kroah-Hartman * @uport: uart port structure for this port 2637ab4382d2SGreg Kroah-Hartman * 2638ab4382d2SGreg Kroah-Hartman * This unhooks (and hangs up) the specified port structure from the 2639ab4382d2SGreg Kroah-Hartman * core driver. No further calls will be made to the low-level code 2640ab4382d2SGreg Kroah-Hartman * for this port. 2641ab4382d2SGreg Kroah-Hartman */ 2642ab4382d2SGreg Kroah-Hartman int uart_remove_one_port(struct uart_driver *drv, struct uart_port *uport) 2643ab4382d2SGreg Kroah-Hartman { 2644ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 2645ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2646b342dd51SChen Gang int ret = 0; 2647ab4382d2SGreg Kroah-Hartman 2648ab4382d2SGreg Kroah-Hartman BUG_ON(in_interrupt()); 2649ab4382d2SGreg Kroah-Hartman 2650ab4382d2SGreg Kroah-Hartman if (state->uart_port != uport) 2651ab4382d2SGreg Kroah-Hartman printk(KERN_ALERT "Removing wrong port: %p != %p\n", 2652ab4382d2SGreg Kroah-Hartman state->uart_port, uport); 2653ab4382d2SGreg Kroah-Hartman 2654ab4382d2SGreg Kroah-Hartman mutex_lock(&port_mutex); 2655ab4382d2SGreg Kroah-Hartman 2656ab4382d2SGreg Kroah-Hartman /* 2657ab4382d2SGreg Kroah-Hartman * Mark the port "dead" - this prevents any opens from 2658ab4382d2SGreg Kroah-Hartman * succeeding while we shut down the port. 2659ab4382d2SGreg Kroah-Hartman */ 2660ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2661b342dd51SChen Gang if (!state->uart_port) { 2662b342dd51SChen Gang mutex_unlock(&port->mutex); 2663b342dd51SChen Gang ret = -EINVAL; 2664b342dd51SChen Gang goto out; 2665b342dd51SChen Gang } 2666ab4382d2SGreg Kroah-Hartman uport->flags |= UPF_DEAD; 2667ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2668ab4382d2SGreg Kroah-Hartman 2669ab4382d2SGreg Kroah-Hartman /* 2670ab4382d2SGreg Kroah-Hartman * Remove the devices from the tty layer 2671ab4382d2SGreg Kroah-Hartman */ 2672ab4382d2SGreg Kroah-Hartman tty_unregister_device(drv->tty_driver, uport->line); 2673ab4382d2SGreg Kroah-Hartman 2674ab4382d2SGreg Kroah-Hartman if (port->tty) 2675ab4382d2SGreg Kroah-Hartman tty_vhangup(port->tty); 2676ab4382d2SGreg Kroah-Hartman 2677ab4382d2SGreg Kroah-Hartman /* 2678ab4382d2SGreg Kroah-Hartman * Free the port IO and memory resources, if any. 2679ab4382d2SGreg Kroah-Hartman */ 2680ab4382d2SGreg Kroah-Hartman if (uport->type != PORT_UNKNOWN) 2681ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 2682ab4382d2SGreg Kroah-Hartman 2683ab4382d2SGreg Kroah-Hartman /* 2684ab4382d2SGreg Kroah-Hartman * Indicate that there isn't a port here anymore. 2685ab4382d2SGreg Kroah-Hartman */ 2686ab4382d2SGreg Kroah-Hartman uport->type = PORT_UNKNOWN; 2687ab4382d2SGreg Kroah-Hartman 2688ab4382d2SGreg Kroah-Hartman state->uart_port = NULL; 2689b342dd51SChen Gang out: 2690ab4382d2SGreg Kroah-Hartman mutex_unlock(&port_mutex); 2691ab4382d2SGreg Kroah-Hartman 2692b342dd51SChen Gang return ret; 2693ab4382d2SGreg Kroah-Hartman } 2694ab4382d2SGreg Kroah-Hartman 2695ab4382d2SGreg Kroah-Hartman /* 2696ab4382d2SGreg Kroah-Hartman * Are the two ports equivalent? 2697ab4382d2SGreg Kroah-Hartman */ 2698ab4382d2SGreg Kroah-Hartman int uart_match_port(struct uart_port *port1, struct uart_port *port2) 2699ab4382d2SGreg Kroah-Hartman { 2700ab4382d2SGreg Kroah-Hartman if (port1->iotype != port2->iotype) 2701ab4382d2SGreg Kroah-Hartman return 0; 2702ab4382d2SGreg Kroah-Hartman 2703ab4382d2SGreg Kroah-Hartman switch (port1->iotype) { 2704ab4382d2SGreg Kroah-Hartman case UPIO_PORT: 2705ab4382d2SGreg Kroah-Hartman return (port1->iobase == port2->iobase); 2706ab4382d2SGreg Kroah-Hartman case UPIO_HUB6: 2707ab4382d2SGreg Kroah-Hartman return (port1->iobase == port2->iobase) && 2708ab4382d2SGreg Kroah-Hartman (port1->hub6 == port2->hub6); 2709ab4382d2SGreg Kroah-Hartman case UPIO_MEM: 2710ab4382d2SGreg Kroah-Hartman case UPIO_MEM32: 2711ab4382d2SGreg Kroah-Hartman case UPIO_AU: 2712ab4382d2SGreg Kroah-Hartman case UPIO_TSI: 2713ab4382d2SGreg Kroah-Hartman return (port1->mapbase == port2->mapbase); 2714ab4382d2SGreg Kroah-Hartman } 2715ab4382d2SGreg Kroah-Hartman return 0; 2716ab4382d2SGreg Kroah-Hartman } 2717ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_match_port); 2718ab4382d2SGreg Kroah-Hartman 2719027d7dacSJiri Slaby /** 2720027d7dacSJiri Slaby * uart_handle_dcd_change - handle a change of carrier detect state 2721027d7dacSJiri Slaby * @uport: uart_port structure for the open port 2722027d7dacSJiri Slaby * @status: new carrier detect status, nonzero if active 2723027d7dacSJiri Slaby */ 2724027d7dacSJiri Slaby void uart_handle_dcd_change(struct uart_port *uport, unsigned int status) 2725027d7dacSJiri Slaby { 2726027d7dacSJiri Slaby struct uart_state *state = uport->state; 2727027d7dacSJiri Slaby struct tty_port *port = &state->port; 272843eca0aeSAlan Cox struct tty_ldisc *ld = NULL; 2729027d7dacSJiri Slaby struct pps_event_time ts; 273043eca0aeSAlan Cox struct tty_struct *tty = port->tty; 2731027d7dacSJiri Slaby 273243eca0aeSAlan Cox if (tty) 273343eca0aeSAlan Cox ld = tty_ldisc_ref(tty); 2734027d7dacSJiri Slaby if (ld && ld->ops->dcd_change) 2735027d7dacSJiri Slaby pps_get_ts(&ts); 2736027d7dacSJiri Slaby 2737027d7dacSJiri Slaby uport->icount.dcd++; 2738027d7dacSJiri Slaby #ifdef CONFIG_HARD_PPS 2739027d7dacSJiri Slaby if ((uport->flags & UPF_HARDPPS_CD) && status) 2740027d7dacSJiri Slaby hardpps(); 2741027d7dacSJiri Slaby #endif 2742027d7dacSJiri Slaby 2743027d7dacSJiri Slaby if (port->flags & ASYNC_CHECK_CD) { 2744027d7dacSJiri Slaby if (status) 2745027d7dacSJiri Slaby wake_up_interruptible(&port->open_wait); 274643eca0aeSAlan Cox else if (tty) 274743eca0aeSAlan Cox tty_hangup(tty); 2748027d7dacSJiri Slaby } 2749027d7dacSJiri Slaby 2750027d7dacSJiri Slaby if (ld && ld->ops->dcd_change) 275143eca0aeSAlan Cox ld->ops->dcd_change(tty, status, &ts); 2752027d7dacSJiri Slaby if (ld) 2753027d7dacSJiri Slaby tty_ldisc_deref(ld); 2754027d7dacSJiri Slaby } 2755027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_handle_dcd_change); 2756027d7dacSJiri Slaby 2757027d7dacSJiri Slaby /** 2758027d7dacSJiri Slaby * uart_handle_cts_change - handle a change of clear-to-send state 2759027d7dacSJiri Slaby * @uport: uart_port structure for the open port 2760027d7dacSJiri Slaby * @status: new clear to send status, nonzero if active 2761027d7dacSJiri Slaby */ 2762027d7dacSJiri Slaby void uart_handle_cts_change(struct uart_port *uport, unsigned int status) 2763027d7dacSJiri Slaby { 2764027d7dacSJiri Slaby struct tty_port *port = &uport->state->port; 2765027d7dacSJiri Slaby struct tty_struct *tty = port->tty; 2766027d7dacSJiri Slaby 2767027d7dacSJiri Slaby uport->icount.cts++; 2768027d7dacSJiri Slaby 2769f21ec3d2SHuang Shijie if (tty_port_cts_enabled(port)) { 2770027d7dacSJiri Slaby if (tty->hw_stopped) { 2771027d7dacSJiri Slaby if (status) { 2772027d7dacSJiri Slaby tty->hw_stopped = 0; 2773027d7dacSJiri Slaby uport->ops->start_tx(uport); 2774027d7dacSJiri Slaby uart_write_wakeup(uport); 2775027d7dacSJiri Slaby } 2776027d7dacSJiri Slaby } else { 2777027d7dacSJiri Slaby if (!status) { 2778027d7dacSJiri Slaby tty->hw_stopped = 1; 2779027d7dacSJiri Slaby uport->ops->stop_tx(uport); 2780027d7dacSJiri Slaby } 2781027d7dacSJiri Slaby } 2782027d7dacSJiri Slaby } 2783027d7dacSJiri Slaby } 2784027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_handle_cts_change); 2785027d7dacSJiri Slaby 2786cf75525fSJiri Slaby /** 2787cf75525fSJiri Slaby * uart_insert_char - push a char to the uart layer 2788cf75525fSJiri Slaby * 2789cf75525fSJiri Slaby * User is responsible to call tty_flip_buffer_push when they are done with 2790cf75525fSJiri Slaby * insertion. 2791cf75525fSJiri Slaby * 2792cf75525fSJiri Slaby * @port: corresponding port 2793cf75525fSJiri Slaby * @status: state of the serial port RX buffer (LSR for 8250) 2794cf75525fSJiri Slaby * @overrun: mask of overrun bits in @status 2795cf75525fSJiri Slaby * @ch: character to push 2796cf75525fSJiri Slaby * @flag: flag for the character (see TTY_NORMAL and friends) 2797cf75525fSJiri Slaby */ 2798027d7dacSJiri Slaby void uart_insert_char(struct uart_port *port, unsigned int status, 2799027d7dacSJiri Slaby unsigned int overrun, unsigned int ch, unsigned int flag) 2800027d7dacSJiri Slaby { 280192a19f9cSJiri Slaby struct tty_port *tport = &port->state->port; 2802027d7dacSJiri Slaby 2803027d7dacSJiri Slaby if ((status & port->ignore_status_mask & ~overrun) == 0) 280492a19f9cSJiri Slaby if (tty_insert_flip_char(tport, ch, flag) == 0) 2805dabfb351SCorbin ++port->icount.buf_overrun; 2806027d7dacSJiri Slaby 2807027d7dacSJiri Slaby /* 2808027d7dacSJiri Slaby * Overrun is special. Since it's reported immediately, 2809027d7dacSJiri Slaby * it doesn't affect the current character. 2810027d7dacSJiri Slaby */ 2811027d7dacSJiri Slaby if (status & ~port->ignore_status_mask & overrun) 281292a19f9cSJiri Slaby if (tty_insert_flip_char(tport, 0, TTY_OVERRUN) == 0) 2813dabfb351SCorbin ++port->icount.buf_overrun; 2814027d7dacSJiri Slaby } 2815027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_insert_char); 2816027d7dacSJiri Slaby 2817ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_write_wakeup); 2818ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_register_driver); 2819ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_unregister_driver); 2820ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_suspend_port); 2821ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_resume_port); 2822ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_add_one_port); 2823ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_remove_one_port); 2824ab4382d2SGreg Kroah-Hartman 2825ab4382d2SGreg Kroah-Hartman MODULE_DESCRIPTION("Serial driver core"); 2826ab4382d2SGreg Kroah-Hartman MODULE_LICENSE("GPL"); 2827