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> 29a208ffd2SGrant Likely #include <linux/of.h> 30ab4382d2SGreg Kroah-Hartman #include <linux/proc_fs.h> 31ab4382d2SGreg Kroah-Hartman #include <linux/seq_file.h> 32ab4382d2SGreg Kroah-Hartman #include <linux/device.h> 33ab4382d2SGreg Kroah-Hartman #include <linux/serial.h> /* for serial_state and serial_icounter_struct */ 34ab4382d2SGreg Kroah-Hartman #include <linux/serial_core.h> 35ab4382d2SGreg Kroah-Hartman #include <linux/delay.h> 36ab4382d2SGreg Kroah-Hartman #include <linux/mutex.h> 37ab4382d2SGreg Kroah-Hartman 38ab4382d2SGreg Kroah-Hartman #include <asm/irq.h> 39ab4382d2SGreg Kroah-Hartman #include <asm/uaccess.h> 40ab4382d2SGreg Kroah-Hartman 41ab4382d2SGreg Kroah-Hartman /* 42ab4382d2SGreg Kroah-Hartman * This is used to lock changes in serial line configuration. 43ab4382d2SGreg Kroah-Hartman */ 44ab4382d2SGreg Kroah-Hartman static DEFINE_MUTEX(port_mutex); 45ab4382d2SGreg Kroah-Hartman 46ab4382d2SGreg Kroah-Hartman /* 47ab4382d2SGreg Kroah-Hartman * lockdep: port->lock is initialized in two places, but we 48ab4382d2SGreg Kroah-Hartman * want only one lock-class: 49ab4382d2SGreg Kroah-Hartman */ 50ab4382d2SGreg Kroah-Hartman static struct lock_class_key port_lock_key; 51ab4382d2SGreg Kroah-Hartman 52ab4382d2SGreg Kroah-Hartman #define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8) 53ab4382d2SGreg Kroah-Hartman 54ab4382d2SGreg Kroah-Hartman static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, 55ab4382d2SGreg Kroah-Hartman struct ktermios *old_termios); 561f33a51dSJiri Slaby static void uart_wait_until_sent(struct tty_struct *tty, int timeout); 576f538fe3SLinus Walleij static void uart_change_pm(struct uart_state *state, 586f538fe3SLinus Walleij enum uart_pm_state pm_state); 59ab4382d2SGreg Kroah-Hartman 60b922e19dSJiri Slaby static void uart_port_shutdown(struct tty_port *port); 61b922e19dSJiri Slaby 62299245a1SPeter Hurley static int uart_dcd_enabled(struct uart_port *uport) 63299245a1SPeter Hurley { 64d4260b51SPeter Hurley return !!(uport->status & UPSTAT_DCD_ENABLE); 65299245a1SPeter Hurley } 66299245a1SPeter Hurley 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 98d01f4d18SPeter Hurley if (!uart_tx_stopped(port)) 99ab4382d2SGreg Kroah-Hartman port->ops->start_tx(port); 100ab4382d2SGreg Kroah-Hartman } 101ab4382d2SGreg Kroah-Hartman 102ab4382d2SGreg Kroah-Hartman static void uart_start(struct tty_struct *tty) 103ab4382d2SGreg Kroah-Hartman { 104ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 105ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 106ab4382d2SGreg Kroah-Hartman unsigned long flags; 107ab4382d2SGreg Kroah-Hartman 108ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 109ab4382d2SGreg Kroah-Hartman __uart_start(tty); 110ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 111ab4382d2SGreg Kroah-Hartman } 112ab4382d2SGreg Kroah-Hartman 113f4581cabSDenys Vlasenko static void 114ab4382d2SGreg Kroah-Hartman uart_update_mctrl(struct uart_port *port, unsigned int set, unsigned int clear) 115ab4382d2SGreg Kroah-Hartman { 116ab4382d2SGreg Kroah-Hartman unsigned long flags; 117ab4382d2SGreg Kroah-Hartman unsigned int old; 118ab4382d2SGreg Kroah-Hartman 119ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 120ab4382d2SGreg Kroah-Hartman old = port->mctrl; 121ab4382d2SGreg Kroah-Hartman port->mctrl = (old & ~clear) | set; 122ab4382d2SGreg Kroah-Hartman if (old != port->mctrl) 123ab4382d2SGreg Kroah-Hartman port->ops->set_mctrl(port, port->mctrl); 124ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 125ab4382d2SGreg Kroah-Hartman } 126ab4382d2SGreg Kroah-Hartman 127ab4382d2SGreg Kroah-Hartman #define uart_set_mctrl(port, set) uart_update_mctrl(port, set, 0) 128ab4382d2SGreg Kroah-Hartman #define uart_clear_mctrl(port, clear) uart_update_mctrl(port, 0, clear) 129ab4382d2SGreg Kroah-Hartman 130ab4382d2SGreg Kroah-Hartman /* 131ab4382d2SGreg Kroah-Hartman * Startup the port. This will be called once per open. All calls 132ab4382d2SGreg Kroah-Hartman * will be serialised by the per-port mutex. 133ab4382d2SGreg Kroah-Hartman */ 134c0d92be6SJiri Slaby static int uart_port_startup(struct tty_struct *tty, struct uart_state *state, 135c0d92be6SJiri Slaby int init_hw) 136ab4382d2SGreg Kroah-Hartman { 137ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 138ab4382d2SGreg Kroah-Hartman unsigned long page; 139ab4382d2SGreg Kroah-Hartman int retval = 0; 140ab4382d2SGreg Kroah-Hartman 141ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) 142c0d92be6SJiri Slaby return 1; 143ab4382d2SGreg Kroah-Hartman 144ab4382d2SGreg Kroah-Hartman /* 1457deb39edSThomas Pfaff * Make sure the device is in D0 state. 1467deb39edSThomas Pfaff */ 1477deb39edSThomas Pfaff uart_change_pm(state, UART_PM_STATE_ON); 1487deb39edSThomas Pfaff 1497deb39edSThomas Pfaff /* 150ab4382d2SGreg Kroah-Hartman * Initialise and allocate the transmit and temporary 151ab4382d2SGreg Kroah-Hartman * buffer. 152ab4382d2SGreg Kroah-Hartman */ 153ab4382d2SGreg Kroah-Hartman if (!state->xmit.buf) { 154ab4382d2SGreg Kroah-Hartman /* This is protected by the per port mutex */ 155ab4382d2SGreg Kroah-Hartman page = get_zeroed_page(GFP_KERNEL); 156ab4382d2SGreg Kroah-Hartman if (!page) 157ab4382d2SGreg Kroah-Hartman return -ENOMEM; 158ab4382d2SGreg Kroah-Hartman 159ab4382d2SGreg Kroah-Hartman state->xmit.buf = (unsigned char *) page; 160ab4382d2SGreg Kroah-Hartman uart_circ_clear(&state->xmit); 161ab4382d2SGreg Kroah-Hartman } 162ab4382d2SGreg Kroah-Hartman 163ab4382d2SGreg Kroah-Hartman retval = uport->ops->startup(uport); 164ab4382d2SGreg Kroah-Hartman if (retval == 0) { 165c7d7abffSJiri Slaby if (uart_console(uport) && uport->cons->cflag) { 166adc8d746SAlan Cox tty->termios.c_cflag = uport->cons->cflag; 167c7d7abffSJiri Slaby uport->cons->cflag = 0; 168c7d7abffSJiri Slaby } 169ab4382d2SGreg Kroah-Hartman /* 170ab4382d2SGreg Kroah-Hartman * Initialise the hardware port settings. 171ab4382d2SGreg Kroah-Hartman */ 172ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 173ab4382d2SGreg Kroah-Hartman 174ab4382d2SGreg Kroah-Hartman /* 175ab4382d2SGreg Kroah-Hartman * Setup the RTS and DTR signals once the 176ab4382d2SGreg Kroah-Hartman * port is open and ready to respond. 177ab4382d2SGreg Kroah-Hartman */ 1789db276f8SPeter Hurley if (init_hw && C_BAUD(tty)) 179ab4382d2SGreg Kroah-Hartman uart_set_mctrl(uport, TIOCM_RTS | TIOCM_DTR); 180ab4382d2SGreg Kroah-Hartman } 181ab4382d2SGreg Kroah-Hartman 1820055197eSJiri Slaby /* 1830055197eSJiri Slaby * This is to allow setserial on this port. People may want to set 1840055197eSJiri Slaby * port/irq/type and then reconfigure the port properly if it failed 1850055197eSJiri Slaby * now. 1860055197eSJiri Slaby */ 187ab4382d2SGreg Kroah-Hartman if (retval && capable(CAP_SYS_ADMIN)) 188c0d92be6SJiri Slaby return 1; 189c0d92be6SJiri Slaby 190c0d92be6SJiri Slaby return retval; 191c0d92be6SJiri Slaby } 192c0d92be6SJiri Slaby 193c0d92be6SJiri Slaby static int uart_startup(struct tty_struct *tty, struct uart_state *state, 194c0d92be6SJiri Slaby int init_hw) 195c0d92be6SJiri Slaby { 196c0d92be6SJiri Slaby struct tty_port *port = &state->port; 197c0d92be6SJiri Slaby int retval; 198c0d92be6SJiri Slaby 199c0d92be6SJiri Slaby if (port->flags & ASYNC_INITIALIZED) 200c0d92be6SJiri Slaby return 0; 201c0d92be6SJiri Slaby 202c0d92be6SJiri Slaby /* 203c0d92be6SJiri Slaby * Set the TTY IO error marker - we will only clear this 204c0d92be6SJiri Slaby * once we have successfully opened the port. 205c0d92be6SJiri Slaby */ 206c0d92be6SJiri Slaby set_bit(TTY_IO_ERROR, &tty->flags); 207c0d92be6SJiri Slaby 208c0d92be6SJiri Slaby retval = uart_port_startup(tty, state, init_hw); 209c0d92be6SJiri Slaby if (!retval) { 210c0d92be6SJiri Slaby set_bit(ASYNCB_INITIALIZED, &port->flags); 211c0d92be6SJiri Slaby clear_bit(TTY_IO_ERROR, &tty->flags); 212c0d92be6SJiri Slaby } else if (retval > 0) 213ab4382d2SGreg Kroah-Hartman retval = 0; 214ab4382d2SGreg Kroah-Hartman 215ab4382d2SGreg Kroah-Hartman return retval; 216ab4382d2SGreg Kroah-Hartman } 217ab4382d2SGreg Kroah-Hartman 218ab4382d2SGreg Kroah-Hartman /* 219ab4382d2SGreg Kroah-Hartman * This routine will shutdown a serial port; interrupts are disabled, and 220ab4382d2SGreg Kroah-Hartman * DTR is dropped if the hangup on close termio flag is on. Calls to 221ab4382d2SGreg Kroah-Hartman * uart_shutdown are serialised by the per-port semaphore. 222ab4382d2SGreg Kroah-Hartman */ 223ab4382d2SGreg Kroah-Hartman static void uart_shutdown(struct tty_struct *tty, struct uart_state *state) 224ab4382d2SGreg Kroah-Hartman { 225ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 226ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 227ab4382d2SGreg Kroah-Hartman 228ab4382d2SGreg Kroah-Hartman /* 229ab4382d2SGreg Kroah-Hartman * Set the TTY IO error marker 230ab4382d2SGreg Kroah-Hartman */ 231ab4382d2SGreg Kroah-Hartman if (tty) 232ab4382d2SGreg Kroah-Hartman set_bit(TTY_IO_ERROR, &tty->flags); 233ab4382d2SGreg Kroah-Hartman 234ab4382d2SGreg Kroah-Hartman if (test_and_clear_bit(ASYNCB_INITIALIZED, &port->flags)) { 235ab4382d2SGreg Kroah-Hartman /* 236ab4382d2SGreg Kroah-Hartman * Turn off DTR and RTS early. 237ab4382d2SGreg Kroah-Hartman */ 238ae84db96SPeter Hurley if (uart_console(uport) && tty) 239ae84db96SPeter Hurley uport->cons->cflag = tty->termios.c_cflag; 240ae84db96SPeter Hurley 2419db276f8SPeter Hurley if (!tty || C_HUPCL(tty)) 242ab4382d2SGreg Kroah-Hartman uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); 243ab4382d2SGreg Kroah-Hartman 244b922e19dSJiri Slaby uart_port_shutdown(port); 245ab4382d2SGreg Kroah-Hartman } 246ab4382d2SGreg Kroah-Hartman 247ab4382d2SGreg Kroah-Hartman /* 248d208a3bfSDoug Anderson * It's possible for shutdown to be called after suspend if we get 249d208a3bfSDoug Anderson * a DCD drop (hangup) at just the right time. Clear suspended bit so 250d208a3bfSDoug Anderson * we don't try to resume a port that has been shutdown. 251ab4382d2SGreg Kroah-Hartman */ 252d208a3bfSDoug Anderson clear_bit(ASYNCB_SUSPENDED, &port->flags); 253ab4382d2SGreg Kroah-Hartman 254ab4382d2SGreg Kroah-Hartman /* 255ab4382d2SGreg Kroah-Hartman * Free the transmit buffer page. 256ab4382d2SGreg Kroah-Hartman */ 257ab4382d2SGreg Kroah-Hartman if (state->xmit.buf) { 258ab4382d2SGreg Kroah-Hartman free_page((unsigned long)state->xmit.buf); 259ab4382d2SGreg Kroah-Hartman state->xmit.buf = NULL; 260ab4382d2SGreg Kroah-Hartman } 261ab4382d2SGreg Kroah-Hartman } 262ab4382d2SGreg Kroah-Hartman 263ab4382d2SGreg Kroah-Hartman /** 264ab4382d2SGreg Kroah-Hartman * uart_update_timeout - update per-port FIFO timeout. 265ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port 266ab4382d2SGreg Kroah-Hartman * @cflag: termios cflag value 267ab4382d2SGreg Kroah-Hartman * @baud: speed of the port 268ab4382d2SGreg Kroah-Hartman * 269ab4382d2SGreg Kroah-Hartman * Set the port FIFO timeout value. The @cflag value should 270ab4382d2SGreg Kroah-Hartman * reflect the actual hardware settings. 271ab4382d2SGreg Kroah-Hartman */ 272ab4382d2SGreg Kroah-Hartman void 273ab4382d2SGreg Kroah-Hartman uart_update_timeout(struct uart_port *port, unsigned int cflag, 274ab4382d2SGreg Kroah-Hartman unsigned int baud) 275ab4382d2SGreg Kroah-Hartman { 276ab4382d2SGreg Kroah-Hartman unsigned int bits; 277ab4382d2SGreg Kroah-Hartman 278ab4382d2SGreg Kroah-Hartman /* byte size and parity */ 279ab4382d2SGreg Kroah-Hartman switch (cflag & CSIZE) { 280ab4382d2SGreg Kroah-Hartman case CS5: 281ab4382d2SGreg Kroah-Hartman bits = 7; 282ab4382d2SGreg Kroah-Hartman break; 283ab4382d2SGreg Kroah-Hartman case CS6: 284ab4382d2SGreg Kroah-Hartman bits = 8; 285ab4382d2SGreg Kroah-Hartman break; 286ab4382d2SGreg Kroah-Hartman case CS7: 287ab4382d2SGreg Kroah-Hartman bits = 9; 288ab4382d2SGreg Kroah-Hartman break; 289ab4382d2SGreg Kroah-Hartman default: 290ab4382d2SGreg Kroah-Hartman bits = 10; 291ab4382d2SGreg Kroah-Hartman break; /* CS8 */ 292ab4382d2SGreg Kroah-Hartman } 293ab4382d2SGreg Kroah-Hartman 294ab4382d2SGreg Kroah-Hartman if (cflag & CSTOPB) 295ab4382d2SGreg Kroah-Hartman bits++; 296ab4382d2SGreg Kroah-Hartman if (cflag & PARENB) 297ab4382d2SGreg Kroah-Hartman bits++; 298ab4382d2SGreg Kroah-Hartman 299ab4382d2SGreg Kroah-Hartman /* 300ab4382d2SGreg Kroah-Hartman * The total number of bits to be transmitted in the fifo. 301ab4382d2SGreg Kroah-Hartman */ 302ab4382d2SGreg Kroah-Hartman bits = bits * port->fifosize; 303ab4382d2SGreg Kroah-Hartman 304ab4382d2SGreg Kroah-Hartman /* 305ab4382d2SGreg Kroah-Hartman * Figure the timeout to send the above number of bits. 306ab4382d2SGreg Kroah-Hartman * Add .02 seconds of slop 307ab4382d2SGreg Kroah-Hartman */ 308ab4382d2SGreg Kroah-Hartman port->timeout = (HZ * bits) / baud + HZ/50; 309ab4382d2SGreg Kroah-Hartman } 310ab4382d2SGreg Kroah-Hartman 311ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_update_timeout); 312ab4382d2SGreg Kroah-Hartman 313ab4382d2SGreg Kroah-Hartman /** 314ab4382d2SGreg Kroah-Hartman * uart_get_baud_rate - return baud rate for a particular port 315ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port in question. 316ab4382d2SGreg Kroah-Hartman * @termios: desired termios settings. 317ab4382d2SGreg Kroah-Hartman * @old: old termios (or NULL) 318ab4382d2SGreg Kroah-Hartman * @min: minimum acceptable baud rate 319ab4382d2SGreg Kroah-Hartman * @max: maximum acceptable baud rate 320ab4382d2SGreg Kroah-Hartman * 321ab4382d2SGreg Kroah-Hartman * Decode the termios structure into a numeric baud rate, 322ab4382d2SGreg Kroah-Hartman * taking account of the magic 38400 baud rate (with spd_* 323ab4382d2SGreg Kroah-Hartman * flags), and mapping the %B0 rate to 9600 baud. 324ab4382d2SGreg Kroah-Hartman * 325ab4382d2SGreg Kroah-Hartman * If the new baud rate is invalid, try the old termios setting. 326ab4382d2SGreg Kroah-Hartman * If it's still invalid, we try 9600 baud. 327ab4382d2SGreg Kroah-Hartman * 328ab4382d2SGreg Kroah-Hartman * Update the @termios structure to reflect the baud rate 329ab4382d2SGreg Kroah-Hartman * we're actually going to be using. Don't do this for the case 330ab4382d2SGreg Kroah-Hartman * where B0 is requested ("hang up"). 331ab4382d2SGreg Kroah-Hartman */ 332ab4382d2SGreg Kroah-Hartman unsigned int 333ab4382d2SGreg Kroah-Hartman uart_get_baud_rate(struct uart_port *port, struct ktermios *termios, 334ab4382d2SGreg Kroah-Hartman struct ktermios *old, unsigned int min, unsigned int max) 335ab4382d2SGreg Kroah-Hartman { 336f10a2233SJoakim Nordell unsigned int try; 337f10a2233SJoakim Nordell unsigned int baud; 338f10a2233SJoakim Nordell unsigned int altbaud; 339ab4382d2SGreg Kroah-Hartman int hung_up = 0; 340ab4382d2SGreg Kroah-Hartman upf_t flags = port->flags & UPF_SPD_MASK; 341ab4382d2SGreg Kroah-Hartman 342f10a2233SJoakim Nordell switch (flags) { 343f10a2233SJoakim Nordell case UPF_SPD_HI: 344ab4382d2SGreg Kroah-Hartman altbaud = 57600; 345f10a2233SJoakim Nordell break; 346f10a2233SJoakim Nordell case UPF_SPD_VHI: 347ab4382d2SGreg Kroah-Hartman altbaud = 115200; 348f10a2233SJoakim Nordell break; 349f10a2233SJoakim Nordell case UPF_SPD_SHI: 350ab4382d2SGreg Kroah-Hartman altbaud = 230400; 351f10a2233SJoakim Nordell break; 352f10a2233SJoakim Nordell case UPF_SPD_WARP: 353ab4382d2SGreg Kroah-Hartman altbaud = 460800; 354f10a2233SJoakim Nordell break; 355f10a2233SJoakim Nordell default: 356f10a2233SJoakim Nordell altbaud = 38400; 357f10a2233SJoakim Nordell break; 358f10a2233SJoakim Nordell } 359ab4382d2SGreg Kroah-Hartman 360ab4382d2SGreg Kroah-Hartman for (try = 0; try < 2; try++) { 361ab4382d2SGreg Kroah-Hartman baud = tty_termios_baud_rate(termios); 362ab4382d2SGreg Kroah-Hartman 363ab4382d2SGreg Kroah-Hartman /* 364ab4382d2SGreg Kroah-Hartman * The spd_hi, spd_vhi, spd_shi, spd_warp kludge... 365ab4382d2SGreg Kroah-Hartman * Die! Die! Die! 366ab4382d2SGreg Kroah-Hartman */ 367547039ecSPeter Hurley if (try == 0 && baud == 38400) 368ab4382d2SGreg Kroah-Hartman baud = altbaud; 369ab4382d2SGreg Kroah-Hartman 370ab4382d2SGreg Kroah-Hartman /* 371ab4382d2SGreg Kroah-Hartman * Special case: B0 rate. 372ab4382d2SGreg Kroah-Hartman */ 373ab4382d2SGreg Kroah-Hartman if (baud == 0) { 374ab4382d2SGreg Kroah-Hartman hung_up = 1; 375ab4382d2SGreg Kroah-Hartman baud = 9600; 376ab4382d2SGreg Kroah-Hartman } 377ab4382d2SGreg Kroah-Hartman 378ab4382d2SGreg Kroah-Hartman if (baud >= min && baud <= max) 379ab4382d2SGreg Kroah-Hartman return baud; 380ab4382d2SGreg Kroah-Hartman 381ab4382d2SGreg Kroah-Hartman /* 382ab4382d2SGreg Kroah-Hartman * Oops, the quotient was zero. Try again with 383ab4382d2SGreg Kroah-Hartman * the old baud rate if possible. 384ab4382d2SGreg Kroah-Hartman */ 385ab4382d2SGreg Kroah-Hartman termios->c_cflag &= ~CBAUD; 386ab4382d2SGreg Kroah-Hartman if (old) { 387ab4382d2SGreg Kroah-Hartman baud = tty_termios_baud_rate(old); 388ab4382d2SGreg Kroah-Hartman if (!hung_up) 389ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 390ab4382d2SGreg Kroah-Hartman baud, baud); 391ab4382d2SGreg Kroah-Hartman old = NULL; 392ab4382d2SGreg Kroah-Hartman continue; 393ab4382d2SGreg Kroah-Hartman } 394ab4382d2SGreg Kroah-Hartman 395ab4382d2SGreg Kroah-Hartman /* 396ab4382d2SGreg Kroah-Hartman * As a last resort, if the range cannot be met then clip to 397ab4382d2SGreg Kroah-Hartman * the nearest chip supported rate. 398ab4382d2SGreg Kroah-Hartman */ 399ab4382d2SGreg Kroah-Hartman if (!hung_up) { 400ab4382d2SGreg Kroah-Hartman if (baud <= min) 401ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 402ab4382d2SGreg Kroah-Hartman min + 1, min + 1); 403ab4382d2SGreg Kroah-Hartman else 404ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 405ab4382d2SGreg Kroah-Hartman max - 1, max - 1); 406ab4382d2SGreg Kroah-Hartman } 407ab4382d2SGreg Kroah-Hartman } 408ab4382d2SGreg Kroah-Hartman /* Should never happen */ 409ab4382d2SGreg Kroah-Hartman WARN_ON(1); 410ab4382d2SGreg Kroah-Hartman return 0; 411ab4382d2SGreg Kroah-Hartman } 412ab4382d2SGreg Kroah-Hartman 413ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_get_baud_rate); 414ab4382d2SGreg Kroah-Hartman 415ab4382d2SGreg Kroah-Hartman /** 416ab4382d2SGreg Kroah-Hartman * uart_get_divisor - return uart clock divisor 417ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port. 418ab4382d2SGreg Kroah-Hartman * @baud: desired baud rate 419ab4382d2SGreg Kroah-Hartman * 420ab4382d2SGreg Kroah-Hartman * Calculate the uart clock divisor for the port. 421ab4382d2SGreg Kroah-Hartman */ 422ab4382d2SGreg Kroah-Hartman unsigned int 423ab4382d2SGreg Kroah-Hartman uart_get_divisor(struct uart_port *port, unsigned int baud) 424ab4382d2SGreg Kroah-Hartman { 425ab4382d2SGreg Kroah-Hartman unsigned int quot; 426ab4382d2SGreg Kroah-Hartman 427ab4382d2SGreg Kroah-Hartman /* 428ab4382d2SGreg Kroah-Hartman * Old custom speed handling. 429ab4382d2SGreg Kroah-Hartman */ 430ab4382d2SGreg Kroah-Hartman if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) 431ab4382d2SGreg Kroah-Hartman quot = port->custom_divisor; 432ab4382d2SGreg Kroah-Hartman else 43397d24634SUwe Kleine-König quot = DIV_ROUND_CLOSEST(port->uartclk, 16 * baud); 434ab4382d2SGreg Kroah-Hartman 435ab4382d2SGreg Kroah-Hartman return quot; 436ab4382d2SGreg Kroah-Hartman } 437ab4382d2SGreg Kroah-Hartman 438ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_get_divisor); 439ab4382d2SGreg Kroah-Hartman 4407c8ab967SPeter Hurley /* Caller holds port mutex */ 441ab4382d2SGreg Kroah-Hartman static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, 442ab4382d2SGreg Kroah-Hartman struct ktermios *old_termios) 443ab4382d2SGreg Kroah-Hartman { 444ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 445ab4382d2SGreg Kroah-Hartman struct ktermios *termios; 446391f93f2SPeter Hurley int hw_stopped; 447ab4382d2SGreg Kroah-Hartman 448ab4382d2SGreg Kroah-Hartman /* 449ab4382d2SGreg Kroah-Hartman * If we have no tty, termios, or the port does not exist, 450ab4382d2SGreg Kroah-Hartman * then we can't set the parameters for this port. 451ab4382d2SGreg Kroah-Hartman */ 452adc8d746SAlan Cox if (!tty || uport->type == PORT_UNKNOWN) 453ab4382d2SGreg Kroah-Hartman return; 454ab4382d2SGreg Kroah-Hartman 455adc8d746SAlan Cox termios = &tty->termios; 456c18b55fdSPeter Hurley uport->ops->set_termios(uport, termios, old_termios); 457ab4382d2SGreg Kroah-Hartman 458ab4382d2SGreg Kroah-Hartman /* 459299245a1SPeter Hurley * Set modem status enables based on termios cflag 460ab4382d2SGreg Kroah-Hartman */ 461299245a1SPeter Hurley spin_lock_irq(&uport->lock); 462ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CRTSCTS) 463299245a1SPeter Hurley uport->status |= UPSTAT_CTS_ENABLE; 464ab4382d2SGreg Kroah-Hartman else 465299245a1SPeter Hurley uport->status &= ~UPSTAT_CTS_ENABLE; 466ab4382d2SGreg Kroah-Hartman 467ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CLOCAL) 468299245a1SPeter Hurley uport->status &= ~UPSTAT_DCD_ENABLE; 469ab4382d2SGreg Kroah-Hartman else 470299245a1SPeter Hurley uport->status |= UPSTAT_DCD_ENABLE; 471391f93f2SPeter Hurley 472391f93f2SPeter Hurley /* reset sw-assisted CTS flow control based on (possibly) new mode */ 473391f93f2SPeter Hurley hw_stopped = uport->hw_stopped; 474391f93f2SPeter Hurley uport->hw_stopped = uart_softcts_mode(uport) && 475391f93f2SPeter Hurley !(uport->ops->get_mctrl(uport) & TIOCM_CTS); 476391f93f2SPeter Hurley if (uport->hw_stopped) { 477391f93f2SPeter Hurley if (!hw_stopped) 478391f93f2SPeter Hurley uport->ops->stop_tx(uport); 479391f93f2SPeter Hurley } else { 480391f93f2SPeter Hurley if (hw_stopped) 481391f93f2SPeter Hurley __uart_start(tty); 482391f93f2SPeter Hurley } 483299245a1SPeter Hurley spin_unlock_irq(&uport->lock); 484ab4382d2SGreg Kroah-Hartman } 485ab4382d2SGreg Kroah-Hartman 486f5291eccSPeter Hurley static int uart_put_char(struct tty_struct *tty, unsigned char c) 487ab4382d2SGreg Kroah-Hartman { 488f5291eccSPeter Hurley struct uart_state *state = tty->driver_data; 489f5291eccSPeter Hurley struct uart_port *port = state->uart_port; 490f5291eccSPeter Hurley struct circ_buf *circ; 491ab4382d2SGreg Kroah-Hartman unsigned long flags; 492ab4382d2SGreg Kroah-Hartman int ret = 0; 493ab4382d2SGreg Kroah-Hartman 494f5291eccSPeter Hurley circ = &state->xmit; 495ab4382d2SGreg Kroah-Hartman if (!circ->buf) 496ab4382d2SGreg Kroah-Hartman return 0; 497ab4382d2SGreg Kroah-Hartman 498ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 499ab4382d2SGreg Kroah-Hartman if (uart_circ_chars_free(circ) != 0) { 500ab4382d2SGreg Kroah-Hartman circ->buf[circ->head] = c; 501ab4382d2SGreg Kroah-Hartman circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1); 502ab4382d2SGreg Kroah-Hartman ret = 1; 503ab4382d2SGreg Kroah-Hartman } 504ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 505ab4382d2SGreg Kroah-Hartman return ret; 506ab4382d2SGreg Kroah-Hartman } 507ab4382d2SGreg Kroah-Hartman 508ab4382d2SGreg Kroah-Hartman static void uart_flush_chars(struct tty_struct *tty) 509ab4382d2SGreg Kroah-Hartman { 510ab4382d2SGreg Kroah-Hartman uart_start(tty); 511ab4382d2SGreg Kroah-Hartman } 512ab4382d2SGreg Kroah-Hartman 513ab4382d2SGreg Kroah-Hartman static int uart_write(struct tty_struct *tty, 514ab4382d2SGreg Kroah-Hartman const unsigned char *buf, int count) 515ab4382d2SGreg Kroah-Hartman { 516ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 517ab4382d2SGreg Kroah-Hartman struct uart_port *port; 518ab4382d2SGreg Kroah-Hartman struct circ_buf *circ; 519ab4382d2SGreg Kroah-Hartman unsigned long flags; 520ab4382d2SGreg Kroah-Hartman int c, ret = 0; 521ab4382d2SGreg Kroah-Hartman 522ab4382d2SGreg Kroah-Hartman /* 523ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 524ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 525ab4382d2SGreg Kroah-Hartman */ 526ab4382d2SGreg Kroah-Hartman if (!state) { 527ab4382d2SGreg Kroah-Hartman WARN_ON(1); 528ab4382d2SGreg Kroah-Hartman return -EL3HLT; 529ab4382d2SGreg Kroah-Hartman } 530ab4382d2SGreg Kroah-Hartman 531ab4382d2SGreg Kroah-Hartman port = state->uart_port; 532ab4382d2SGreg Kroah-Hartman circ = &state->xmit; 533ab4382d2SGreg Kroah-Hartman 534ab4382d2SGreg Kroah-Hartman if (!circ->buf) 535ab4382d2SGreg Kroah-Hartman return 0; 536ab4382d2SGreg Kroah-Hartman 537ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 538ab4382d2SGreg Kroah-Hartman while (1) { 539ab4382d2SGreg Kroah-Hartman c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE); 540ab4382d2SGreg Kroah-Hartman if (count < c) 541ab4382d2SGreg Kroah-Hartman c = count; 542ab4382d2SGreg Kroah-Hartman if (c <= 0) 543ab4382d2SGreg Kroah-Hartman break; 544ab4382d2SGreg Kroah-Hartman memcpy(circ->buf + circ->head, buf, c); 545ab4382d2SGreg Kroah-Hartman circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1); 546ab4382d2SGreg Kroah-Hartman buf += c; 547ab4382d2SGreg Kroah-Hartman count -= c; 548ab4382d2SGreg Kroah-Hartman ret += c; 549ab4382d2SGreg Kroah-Hartman } 55064dbee31SPeter Hurley 55164dbee31SPeter Hurley __uart_start(tty); 552ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 553ab4382d2SGreg Kroah-Hartman 554ab4382d2SGreg Kroah-Hartman return ret; 555ab4382d2SGreg Kroah-Hartman } 556ab4382d2SGreg Kroah-Hartman 557ab4382d2SGreg Kroah-Hartman static int uart_write_room(struct tty_struct *tty) 558ab4382d2SGreg Kroah-Hartman { 559ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 560ab4382d2SGreg Kroah-Hartman unsigned long flags; 561ab4382d2SGreg Kroah-Hartman int ret; 562ab4382d2SGreg Kroah-Hartman 563ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&state->uart_port->lock, flags); 564ab4382d2SGreg Kroah-Hartman ret = uart_circ_chars_free(&state->xmit); 565ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&state->uart_port->lock, flags); 566ab4382d2SGreg Kroah-Hartman return ret; 567ab4382d2SGreg Kroah-Hartman } 568ab4382d2SGreg Kroah-Hartman 569ab4382d2SGreg Kroah-Hartman static int uart_chars_in_buffer(struct tty_struct *tty) 570ab4382d2SGreg Kroah-Hartman { 571ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 572ab4382d2SGreg Kroah-Hartman unsigned long flags; 573ab4382d2SGreg Kroah-Hartman int ret; 574ab4382d2SGreg Kroah-Hartman 575ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&state->uart_port->lock, flags); 576ab4382d2SGreg Kroah-Hartman ret = uart_circ_chars_pending(&state->xmit); 577ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&state->uart_port->lock, flags); 578ab4382d2SGreg Kroah-Hartman return ret; 579ab4382d2SGreg Kroah-Hartman } 580ab4382d2SGreg Kroah-Hartman 581ab4382d2SGreg Kroah-Hartman static void uart_flush_buffer(struct tty_struct *tty) 582ab4382d2SGreg Kroah-Hartman { 583ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 584ab4382d2SGreg Kroah-Hartman struct uart_port *port; 585ab4382d2SGreg Kroah-Hartman unsigned long flags; 586ab4382d2SGreg Kroah-Hartman 587ab4382d2SGreg Kroah-Hartman /* 588ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 589ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 590ab4382d2SGreg Kroah-Hartman */ 591ab4382d2SGreg Kroah-Hartman if (!state) { 592ab4382d2SGreg Kroah-Hartman WARN_ON(1); 593ab4382d2SGreg Kroah-Hartman return; 594ab4382d2SGreg Kroah-Hartman } 595ab4382d2SGreg Kroah-Hartman 596ab4382d2SGreg Kroah-Hartman port = state->uart_port; 597ab4382d2SGreg Kroah-Hartman pr_debug("uart_flush_buffer(%d) called\n", tty->index); 598ab4382d2SGreg Kroah-Hartman 599ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 600ab4382d2SGreg Kroah-Hartman uart_circ_clear(&state->xmit); 601ab4382d2SGreg Kroah-Hartman if (port->ops->flush_buffer) 602ab4382d2SGreg Kroah-Hartman port->ops->flush_buffer(port); 603ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 604ab4382d2SGreg Kroah-Hartman tty_wakeup(tty); 605ab4382d2SGreg Kroah-Hartman } 606ab4382d2SGreg Kroah-Hartman 607ab4382d2SGreg Kroah-Hartman /* 608ab4382d2SGreg Kroah-Hartman * This function is used to send a high-priority XON/XOFF character to 609ab4382d2SGreg Kroah-Hartman * the device 610ab4382d2SGreg Kroah-Hartman */ 611ab4382d2SGreg Kroah-Hartman static void uart_send_xchar(struct tty_struct *tty, char ch) 612ab4382d2SGreg Kroah-Hartman { 613ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 614ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 615ab4382d2SGreg Kroah-Hartman unsigned long flags; 616ab4382d2SGreg Kroah-Hartman 617ab4382d2SGreg Kroah-Hartman if (port->ops->send_xchar) 618ab4382d2SGreg Kroah-Hartman port->ops->send_xchar(port, ch); 619ab4382d2SGreg Kroah-Hartman else { 620ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 621c235ccc1SPeter Hurley port->x_char = ch; 622c235ccc1SPeter Hurley if (ch) 623ab4382d2SGreg Kroah-Hartman port->ops->start_tx(port); 624ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 625ab4382d2SGreg Kroah-Hartman } 626ab4382d2SGreg Kroah-Hartman } 627ab4382d2SGreg Kroah-Hartman 628ab4382d2SGreg Kroah-Hartman static void uart_throttle(struct tty_struct *tty) 629ab4382d2SGreg Kroah-Hartman { 630ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 6319aba8d5bSRussell King struct uart_port *port = state->uart_port; 632391f93f2SPeter Hurley upstat_t mask = 0; 633ab4382d2SGreg Kroah-Hartman 634ab4382d2SGreg Kroah-Hartman if (I_IXOFF(tty)) 635391f93f2SPeter Hurley mask |= UPSTAT_AUTOXOFF; 6369db276f8SPeter Hurley if (C_CRTSCTS(tty)) 637391f93f2SPeter Hurley mask |= UPSTAT_AUTORTS; 6389aba8d5bSRussell King 639391f93f2SPeter Hurley if (port->status & mask) { 6409aba8d5bSRussell King port->ops->throttle(port); 641391f93f2SPeter Hurley mask &= ~port->status; 6429aba8d5bSRussell King } 6439aba8d5bSRussell King 644391f93f2SPeter Hurley if (mask & UPSTAT_AUTOXOFF) 645ab4382d2SGreg Kroah-Hartman uart_send_xchar(tty, STOP_CHAR(tty)); 646ab4382d2SGreg Kroah-Hartman 647391f93f2SPeter Hurley if (mask & UPSTAT_AUTORTS) 6489aba8d5bSRussell King uart_clear_mctrl(port, TIOCM_RTS); 649ab4382d2SGreg Kroah-Hartman } 650ab4382d2SGreg Kroah-Hartman 651ab4382d2SGreg Kroah-Hartman static void uart_unthrottle(struct tty_struct *tty) 652ab4382d2SGreg Kroah-Hartman { 653ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 654ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 655391f93f2SPeter Hurley upstat_t mask = 0; 656ab4382d2SGreg Kroah-Hartman 6579aba8d5bSRussell King if (I_IXOFF(tty)) 658391f93f2SPeter Hurley mask |= UPSTAT_AUTOXOFF; 6599db276f8SPeter Hurley if (C_CRTSCTS(tty)) 660391f93f2SPeter Hurley mask |= UPSTAT_AUTORTS; 6619aba8d5bSRussell King 662391f93f2SPeter Hurley if (port->status & mask) { 6639aba8d5bSRussell King port->ops->unthrottle(port); 664391f93f2SPeter Hurley mask &= ~port->status; 6659aba8d5bSRussell King } 6669aba8d5bSRussell King 667391f93f2SPeter Hurley if (mask & UPSTAT_AUTOXOFF) 668ab4382d2SGreg Kroah-Hartman uart_send_xchar(tty, START_CHAR(tty)); 669ab4382d2SGreg Kroah-Hartman 670391f93f2SPeter Hurley if (mask & UPSTAT_AUTORTS) 671ab4382d2SGreg Kroah-Hartman uart_set_mctrl(port, TIOCM_RTS); 672ab4382d2SGreg Kroah-Hartman } 673ab4382d2SGreg Kroah-Hartman 6749f109694SAlan Cox static void do_uart_get_info(struct tty_port *port, 6757ba2e769SAlan Cox struct serial_struct *retinfo) 676ab4382d2SGreg Kroah-Hartman { 6779f109694SAlan Cox struct uart_state *state = container_of(port, struct uart_state, port); 678ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 6797ba2e769SAlan Cox 68037cd0c99SFengguang Wu memset(retinfo, 0, sizeof(*retinfo)); 6817ba2e769SAlan Cox 6827ba2e769SAlan Cox retinfo->type = uport->type; 6837ba2e769SAlan Cox retinfo->line = uport->line; 6847ba2e769SAlan Cox retinfo->port = uport->iobase; 6857ba2e769SAlan Cox if (HIGH_BITS_OFFSET) 6867ba2e769SAlan Cox retinfo->port_high = (long) uport->iobase >> HIGH_BITS_OFFSET; 6877ba2e769SAlan Cox retinfo->irq = uport->irq; 6887ba2e769SAlan Cox retinfo->flags = uport->flags; 6897ba2e769SAlan Cox retinfo->xmit_fifo_size = uport->fifosize; 6907ba2e769SAlan Cox retinfo->baud_base = uport->uartclk / 16; 6917ba2e769SAlan Cox retinfo->close_delay = jiffies_to_msecs(port->close_delay) / 10; 6927ba2e769SAlan Cox retinfo->closing_wait = port->closing_wait == ASYNC_CLOSING_WAIT_NONE ? 6937ba2e769SAlan Cox ASYNC_CLOSING_WAIT_NONE : 6947ba2e769SAlan Cox jiffies_to_msecs(port->closing_wait) / 10; 6957ba2e769SAlan Cox retinfo->custom_divisor = uport->custom_divisor; 6967ba2e769SAlan Cox retinfo->hub6 = uport->hub6; 6977ba2e769SAlan Cox retinfo->io_type = uport->iotype; 6987ba2e769SAlan Cox retinfo->iomem_reg_shift = uport->regshift; 6997ba2e769SAlan Cox retinfo->iomem_base = (void *)(unsigned long)uport->mapbase; 7007ba2e769SAlan Cox } 7017ba2e769SAlan Cox 7029f109694SAlan Cox static void uart_get_info(struct tty_port *port, 7039f109694SAlan Cox struct serial_struct *retinfo) 7047ba2e769SAlan Cox { 705ab4382d2SGreg Kroah-Hartman /* Ensure the state we copy is consistent and no hardware changes 706ab4382d2SGreg Kroah-Hartman occur as we go */ 707ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 7089f109694SAlan Cox do_uart_get_info(port, retinfo); 709ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 7109f109694SAlan Cox } 7119f109694SAlan Cox 7129f109694SAlan Cox static int uart_get_info_user(struct tty_port *port, 7139f109694SAlan Cox struct serial_struct __user *retinfo) 7149f109694SAlan Cox { 7159f109694SAlan Cox struct serial_struct tmp; 7169f109694SAlan Cox uart_get_info(port, &tmp); 717ab4382d2SGreg Kroah-Hartman 718ab4382d2SGreg Kroah-Hartman if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) 719ab4382d2SGreg Kroah-Hartman return -EFAULT; 720ab4382d2SGreg Kroah-Hartman return 0; 721ab4382d2SGreg Kroah-Hartman } 722ab4382d2SGreg Kroah-Hartman 7237ba2e769SAlan Cox static int uart_set_info(struct tty_struct *tty, struct tty_port *port, 7247ba2e769SAlan Cox struct uart_state *state, 7257ba2e769SAlan Cox struct serial_struct *new_info) 726ab4382d2SGreg Kroah-Hartman { 727ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 728ab4382d2SGreg Kroah-Hartman unsigned long new_port; 729ab4382d2SGreg Kroah-Hartman unsigned int change_irq, change_port, closing_wait; 730ab4382d2SGreg Kroah-Hartman unsigned int old_custom_divisor, close_delay; 731ab4382d2SGreg Kroah-Hartman upf_t old_flags, new_flags; 732ab4382d2SGreg Kroah-Hartman int retval = 0; 733ab4382d2SGreg Kroah-Hartman 7347ba2e769SAlan Cox new_port = new_info->port; 735ab4382d2SGreg Kroah-Hartman if (HIGH_BITS_OFFSET) 7367ba2e769SAlan Cox new_port += (unsigned long) new_info->port_high << HIGH_BITS_OFFSET; 737ab4382d2SGreg Kroah-Hartman 7387ba2e769SAlan Cox new_info->irq = irq_canonicalize(new_info->irq); 7397ba2e769SAlan Cox close_delay = msecs_to_jiffies(new_info->close_delay * 10); 7407ba2e769SAlan Cox closing_wait = new_info->closing_wait == ASYNC_CLOSING_WAIT_NONE ? 7414cb0fbfdSJiri Slaby ASYNC_CLOSING_WAIT_NONE : 7427ba2e769SAlan Cox msecs_to_jiffies(new_info->closing_wait * 10); 743ab4382d2SGreg Kroah-Hartman 744ab4382d2SGreg Kroah-Hartman 745ab4382d2SGreg Kroah-Hartman change_irq = !(uport->flags & UPF_FIXED_PORT) 7467ba2e769SAlan Cox && new_info->irq != uport->irq; 747ab4382d2SGreg Kroah-Hartman 748ab4382d2SGreg Kroah-Hartman /* 749ab4382d2SGreg Kroah-Hartman * Since changing the 'type' of the port changes its resource 750ab4382d2SGreg Kroah-Hartman * allocations, we should treat type changes the same as 751ab4382d2SGreg Kroah-Hartman * IO port changes. 752ab4382d2SGreg Kroah-Hartman */ 753ab4382d2SGreg Kroah-Hartman change_port = !(uport->flags & UPF_FIXED_PORT) 754ab4382d2SGreg Kroah-Hartman && (new_port != uport->iobase || 7557ba2e769SAlan Cox (unsigned long)new_info->iomem_base != uport->mapbase || 7567ba2e769SAlan Cox new_info->hub6 != uport->hub6 || 7577ba2e769SAlan Cox new_info->io_type != uport->iotype || 7587ba2e769SAlan Cox new_info->iomem_reg_shift != uport->regshift || 7597ba2e769SAlan Cox new_info->type != uport->type); 760ab4382d2SGreg Kroah-Hartman 761ab4382d2SGreg Kroah-Hartman old_flags = uport->flags; 7627ba2e769SAlan Cox new_flags = new_info->flags; 763ab4382d2SGreg Kroah-Hartman old_custom_divisor = uport->custom_divisor; 764ab4382d2SGreg Kroah-Hartman 765ab4382d2SGreg Kroah-Hartman if (!capable(CAP_SYS_ADMIN)) { 766ab4382d2SGreg Kroah-Hartman retval = -EPERM; 767ab4382d2SGreg Kroah-Hartman if (change_irq || change_port || 7687ba2e769SAlan Cox (new_info->baud_base != uport->uartclk / 16) || 769ab4382d2SGreg Kroah-Hartman (close_delay != port->close_delay) || 770ab4382d2SGreg Kroah-Hartman (closing_wait != port->closing_wait) || 7717ba2e769SAlan Cox (new_info->xmit_fifo_size && 7727ba2e769SAlan Cox new_info->xmit_fifo_size != uport->fifosize) || 773ab4382d2SGreg Kroah-Hartman (((new_flags ^ old_flags) & ~UPF_USR_MASK) != 0)) 774ab4382d2SGreg Kroah-Hartman goto exit; 775ab4382d2SGreg Kroah-Hartman uport->flags = ((uport->flags & ~UPF_USR_MASK) | 776ab4382d2SGreg Kroah-Hartman (new_flags & UPF_USR_MASK)); 7777ba2e769SAlan Cox uport->custom_divisor = new_info->custom_divisor; 778ab4382d2SGreg Kroah-Hartman goto check_and_exit; 779ab4382d2SGreg Kroah-Hartman } 780ab4382d2SGreg Kroah-Hartman 781ab4382d2SGreg Kroah-Hartman /* 782ab4382d2SGreg Kroah-Hartman * Ask the low level driver to verify the settings. 783ab4382d2SGreg Kroah-Hartman */ 784ab4382d2SGreg Kroah-Hartman if (uport->ops->verify_port) 7857ba2e769SAlan Cox retval = uport->ops->verify_port(uport, new_info); 786ab4382d2SGreg Kroah-Hartman 7877ba2e769SAlan Cox if ((new_info->irq >= nr_irqs) || (new_info->irq < 0) || 7887ba2e769SAlan Cox (new_info->baud_base < 9600)) 789ab4382d2SGreg Kroah-Hartman retval = -EINVAL; 790ab4382d2SGreg Kroah-Hartman 791ab4382d2SGreg Kroah-Hartman if (retval) 792ab4382d2SGreg Kroah-Hartman goto exit; 793ab4382d2SGreg Kroah-Hartman 794ab4382d2SGreg Kroah-Hartman if (change_port || change_irq) { 795ab4382d2SGreg Kroah-Hartman retval = -EBUSY; 796ab4382d2SGreg Kroah-Hartman 797ab4382d2SGreg Kroah-Hartman /* 798ab4382d2SGreg Kroah-Hartman * Make sure that we are the sole user of this port. 799ab4382d2SGreg Kroah-Hartman */ 800ab4382d2SGreg Kroah-Hartman if (tty_port_users(port) > 1) 801ab4382d2SGreg Kroah-Hartman goto exit; 802ab4382d2SGreg Kroah-Hartman 803ab4382d2SGreg Kroah-Hartman /* 804ab4382d2SGreg Kroah-Hartman * We need to shutdown the serial port at the old 805ab4382d2SGreg Kroah-Hartman * port/type/irq combination. 806ab4382d2SGreg Kroah-Hartman */ 807ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 808ab4382d2SGreg Kroah-Hartman } 809ab4382d2SGreg Kroah-Hartman 810ab4382d2SGreg Kroah-Hartman if (change_port) { 811ab4382d2SGreg Kroah-Hartman unsigned long old_iobase, old_mapbase; 812ab4382d2SGreg Kroah-Hartman unsigned int old_type, old_iotype, old_hub6, old_shift; 813ab4382d2SGreg Kroah-Hartman 814ab4382d2SGreg Kroah-Hartman old_iobase = uport->iobase; 815ab4382d2SGreg Kroah-Hartman old_mapbase = uport->mapbase; 816ab4382d2SGreg Kroah-Hartman old_type = uport->type; 817ab4382d2SGreg Kroah-Hartman old_hub6 = uport->hub6; 818ab4382d2SGreg Kroah-Hartman old_iotype = uport->iotype; 819ab4382d2SGreg Kroah-Hartman old_shift = uport->regshift; 820ab4382d2SGreg Kroah-Hartman 821ab4382d2SGreg Kroah-Hartman /* 822ab4382d2SGreg Kroah-Hartman * Free and release old regions 823ab4382d2SGreg Kroah-Hartman */ 824ab4382d2SGreg Kroah-Hartman if (old_type != PORT_UNKNOWN) 825ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 826ab4382d2SGreg Kroah-Hartman 827ab4382d2SGreg Kroah-Hartman uport->iobase = new_port; 8287ba2e769SAlan Cox uport->type = new_info->type; 8297ba2e769SAlan Cox uport->hub6 = new_info->hub6; 8307ba2e769SAlan Cox uport->iotype = new_info->io_type; 8317ba2e769SAlan Cox uport->regshift = new_info->iomem_reg_shift; 8327ba2e769SAlan Cox uport->mapbase = (unsigned long)new_info->iomem_base; 833ab4382d2SGreg Kroah-Hartman 834ab4382d2SGreg Kroah-Hartman /* 835ab4382d2SGreg Kroah-Hartman * Claim and map the new regions 836ab4382d2SGreg Kroah-Hartman */ 837ab4382d2SGreg Kroah-Hartman if (uport->type != PORT_UNKNOWN) { 838ab4382d2SGreg Kroah-Hartman retval = uport->ops->request_port(uport); 839ab4382d2SGreg Kroah-Hartman } else { 840ab4382d2SGreg Kroah-Hartman /* Always success - Jean II */ 841ab4382d2SGreg Kroah-Hartman retval = 0; 842ab4382d2SGreg Kroah-Hartman } 843ab4382d2SGreg Kroah-Hartman 844ab4382d2SGreg Kroah-Hartman /* 845ab4382d2SGreg Kroah-Hartman * If we fail to request resources for the 846ab4382d2SGreg Kroah-Hartman * new port, try to restore the old settings. 847ab4382d2SGreg Kroah-Hartman */ 8487deb39edSThomas Pfaff if (retval) { 849ab4382d2SGreg Kroah-Hartman uport->iobase = old_iobase; 850ab4382d2SGreg Kroah-Hartman uport->type = old_type; 851ab4382d2SGreg Kroah-Hartman uport->hub6 = old_hub6; 852ab4382d2SGreg Kroah-Hartman uport->iotype = old_iotype; 853ab4382d2SGreg Kroah-Hartman uport->regshift = old_shift; 854ab4382d2SGreg Kroah-Hartman uport->mapbase = old_mapbase; 8557deb39edSThomas Pfaff 8567deb39edSThomas Pfaff if (old_type != PORT_UNKNOWN) { 857ab4382d2SGreg Kroah-Hartman retval = uport->ops->request_port(uport); 858ab4382d2SGreg Kroah-Hartman /* 859ab4382d2SGreg Kroah-Hartman * If we failed to restore the old settings, 860ab4382d2SGreg Kroah-Hartman * we fail like this. 861ab4382d2SGreg Kroah-Hartman */ 862ab4382d2SGreg Kroah-Hartman if (retval) 863ab4382d2SGreg Kroah-Hartman uport->type = PORT_UNKNOWN; 864ab4382d2SGreg Kroah-Hartman 865ab4382d2SGreg Kroah-Hartman /* 866ab4382d2SGreg Kroah-Hartman * We failed anyway. 867ab4382d2SGreg Kroah-Hartman */ 868ab4382d2SGreg Kroah-Hartman retval = -EBUSY; 8697deb39edSThomas Pfaff } 8707deb39edSThomas Pfaff 871ab4382d2SGreg Kroah-Hartman /* Added to return the correct error -Ram Gupta */ 872ab4382d2SGreg Kroah-Hartman goto exit; 873ab4382d2SGreg Kroah-Hartman } 874ab4382d2SGreg Kroah-Hartman } 875ab4382d2SGreg Kroah-Hartman 876ab4382d2SGreg Kroah-Hartman if (change_irq) 8777ba2e769SAlan Cox uport->irq = new_info->irq; 878ab4382d2SGreg Kroah-Hartman if (!(uport->flags & UPF_FIXED_PORT)) 8797ba2e769SAlan Cox uport->uartclk = new_info->baud_base * 16; 880ab4382d2SGreg Kroah-Hartman uport->flags = (uport->flags & ~UPF_CHANGE_MASK) | 881ab4382d2SGreg Kroah-Hartman (new_flags & UPF_CHANGE_MASK); 8827ba2e769SAlan Cox uport->custom_divisor = new_info->custom_divisor; 883ab4382d2SGreg Kroah-Hartman port->close_delay = close_delay; 884ab4382d2SGreg Kroah-Hartman port->closing_wait = closing_wait; 8857ba2e769SAlan Cox if (new_info->xmit_fifo_size) 8867ba2e769SAlan Cox uport->fifosize = new_info->xmit_fifo_size; 887d6c53c0eSJiri Slaby port->low_latency = (uport->flags & UPF_LOW_LATENCY) ? 1 : 0; 888ab4382d2SGreg Kroah-Hartman 889ab4382d2SGreg Kroah-Hartman check_and_exit: 890ab4382d2SGreg Kroah-Hartman retval = 0; 891ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) 892ab4382d2SGreg Kroah-Hartman goto exit; 893ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_INITIALIZED) { 894ab4382d2SGreg Kroah-Hartman if (((old_flags ^ uport->flags) & UPF_SPD_MASK) || 895ab4382d2SGreg Kroah-Hartman old_custom_divisor != uport->custom_divisor) { 896ab4382d2SGreg Kroah-Hartman /* 897ab4382d2SGreg Kroah-Hartman * If they're setting up a custom divisor or speed, 898ab4382d2SGreg Kroah-Hartman * instead of clearing it, then bitch about it. No 899ab4382d2SGreg Kroah-Hartman * need to rate-limit; it's CAP_SYS_ADMIN only. 900ab4382d2SGreg Kroah-Hartman */ 901ab4382d2SGreg Kroah-Hartman if (uport->flags & UPF_SPD_MASK) { 9022f2dafe7SSudip Mukherjee dev_notice(uport->dev, 9032f2dafe7SSudip Mukherjee "%s sets custom speed on %s. This is deprecated.\n", 9042f2dafe7SSudip Mukherjee current->comm, 905429b4749SRasmus Villemoes tty_name(port->tty)); 906ab4382d2SGreg Kroah-Hartman } 907ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 908ab4382d2SGreg Kroah-Hartman } 909ab4382d2SGreg Kroah-Hartman } else 910ab4382d2SGreg Kroah-Hartman retval = uart_startup(tty, state, 1); 911ab4382d2SGreg Kroah-Hartman exit: 9127ba2e769SAlan Cox return retval; 9137ba2e769SAlan Cox } 9147ba2e769SAlan Cox 9157ba2e769SAlan Cox static int uart_set_info_user(struct tty_struct *tty, struct uart_state *state, 9167ba2e769SAlan Cox struct serial_struct __user *newinfo) 9177ba2e769SAlan Cox { 9187ba2e769SAlan Cox struct serial_struct new_serial; 9197ba2e769SAlan Cox struct tty_port *port = &state->port; 9207ba2e769SAlan Cox int retval; 9217ba2e769SAlan Cox 9227ba2e769SAlan Cox if (copy_from_user(&new_serial, newinfo, sizeof(new_serial))) 9237ba2e769SAlan Cox return -EFAULT; 9247ba2e769SAlan Cox 9257ba2e769SAlan Cox /* 9267ba2e769SAlan Cox * This semaphore protects port->count. It is also 9277ba2e769SAlan Cox * very useful to prevent opens. Also, take the 9287ba2e769SAlan Cox * port configuration semaphore to make sure that a 9297ba2e769SAlan Cox * module insertion/removal doesn't change anything 9307ba2e769SAlan Cox * under us. 9317ba2e769SAlan Cox */ 9327ba2e769SAlan Cox mutex_lock(&port->mutex); 9337ba2e769SAlan Cox retval = uart_set_info(tty, port, state, &new_serial); 934ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 935ab4382d2SGreg Kroah-Hartman return retval; 936ab4382d2SGreg Kroah-Hartman } 937ab4382d2SGreg Kroah-Hartman 938ab4382d2SGreg Kroah-Hartman /** 939ab4382d2SGreg Kroah-Hartman * uart_get_lsr_info - get line status register info 940ab4382d2SGreg Kroah-Hartman * @tty: tty associated with the UART 941ab4382d2SGreg Kroah-Hartman * @state: UART being queried 942ab4382d2SGreg Kroah-Hartman * @value: returned modem value 943ab4382d2SGreg Kroah-Hartman * 944ab4382d2SGreg Kroah-Hartman * Note: uart_ioctl protects us against hangups. 945ab4382d2SGreg Kroah-Hartman */ 946ab4382d2SGreg Kroah-Hartman static int uart_get_lsr_info(struct tty_struct *tty, 947ab4382d2SGreg Kroah-Hartman struct uart_state *state, unsigned int __user *value) 948ab4382d2SGreg Kroah-Hartman { 949ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 950ab4382d2SGreg Kroah-Hartman unsigned int result; 951ab4382d2SGreg Kroah-Hartman 952ab4382d2SGreg Kroah-Hartman result = uport->ops->tx_empty(uport); 953ab4382d2SGreg Kroah-Hartman 954ab4382d2SGreg Kroah-Hartman /* 955ab4382d2SGreg Kroah-Hartman * If we're about to load something into the transmit 956ab4382d2SGreg Kroah-Hartman * register, we'll pretend the transmitter isn't empty to 957ab4382d2SGreg Kroah-Hartman * avoid a race condition (depending on when the transmit 958ab4382d2SGreg Kroah-Hartman * interrupt happens). 959ab4382d2SGreg Kroah-Hartman */ 960ab4382d2SGreg Kroah-Hartman if (uport->x_char || 961ab4382d2SGreg Kroah-Hartman ((uart_circ_chars_pending(&state->xmit) > 0) && 962d01f4d18SPeter Hurley !uart_tx_stopped(uport))) 963ab4382d2SGreg Kroah-Hartman result &= ~TIOCSER_TEMT; 964ab4382d2SGreg Kroah-Hartman 965ab4382d2SGreg Kroah-Hartman return put_user(result, value); 966ab4382d2SGreg Kroah-Hartman } 967ab4382d2SGreg Kroah-Hartman 96860b33c13SAlan Cox static int uart_tiocmget(struct tty_struct *tty) 969ab4382d2SGreg Kroah-Hartman { 970ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 971ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 972ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 973ab4382d2SGreg Kroah-Hartman int result = -EIO; 974ab4382d2SGreg Kroah-Hartman 975ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 97660b33c13SAlan Cox if (!(tty->flags & (1 << TTY_IO_ERROR))) { 977ab4382d2SGreg Kroah-Hartman result = uport->mctrl; 978ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 979ab4382d2SGreg Kroah-Hartman result |= uport->ops->get_mctrl(uport); 980ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 981ab4382d2SGreg Kroah-Hartman } 982ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 983ab4382d2SGreg Kroah-Hartman 984ab4382d2SGreg Kroah-Hartman return result; 985ab4382d2SGreg Kroah-Hartman } 986ab4382d2SGreg Kroah-Hartman 987ab4382d2SGreg Kroah-Hartman static int 98820b9d177SAlan Cox uart_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear) 989ab4382d2SGreg Kroah-Hartman { 990ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 991ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 992ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 993ab4382d2SGreg Kroah-Hartman int ret = -EIO; 994ab4382d2SGreg Kroah-Hartman 995ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 99620b9d177SAlan Cox if (!(tty->flags & (1 << TTY_IO_ERROR))) { 997ab4382d2SGreg Kroah-Hartman uart_update_mctrl(uport, set, clear); 998ab4382d2SGreg Kroah-Hartman ret = 0; 999ab4382d2SGreg Kroah-Hartman } 1000ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1001ab4382d2SGreg Kroah-Hartman return ret; 1002ab4382d2SGreg Kroah-Hartman } 1003ab4382d2SGreg Kroah-Hartman 1004ab4382d2SGreg Kroah-Hartman static int uart_break_ctl(struct tty_struct *tty, int break_state) 1005ab4382d2SGreg Kroah-Hartman { 1006ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1007ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1008ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1009ab4382d2SGreg Kroah-Hartman 1010ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1011ab4382d2SGreg Kroah-Hartman 1012ab4382d2SGreg Kroah-Hartman if (uport->type != PORT_UNKNOWN) 1013ab4382d2SGreg Kroah-Hartman uport->ops->break_ctl(uport, break_state); 1014ab4382d2SGreg Kroah-Hartman 1015ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1016ab4382d2SGreg Kroah-Hartman return 0; 1017ab4382d2SGreg Kroah-Hartman } 1018ab4382d2SGreg Kroah-Hartman 1019ab4382d2SGreg Kroah-Hartman static int uart_do_autoconfig(struct tty_struct *tty,struct uart_state *state) 1020ab4382d2SGreg Kroah-Hartman { 1021ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1022ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1023ab4382d2SGreg Kroah-Hartman int flags, ret; 1024ab4382d2SGreg Kroah-Hartman 1025ab4382d2SGreg Kroah-Hartman if (!capable(CAP_SYS_ADMIN)) 1026ab4382d2SGreg Kroah-Hartman return -EPERM; 1027ab4382d2SGreg Kroah-Hartman 1028ab4382d2SGreg Kroah-Hartman /* 1029ab4382d2SGreg Kroah-Hartman * Take the per-port semaphore. This prevents count from 1030ab4382d2SGreg Kroah-Hartman * changing, and hence any extra opens of the port while 1031ab4382d2SGreg Kroah-Hartman * we're auto-configuring. 1032ab4382d2SGreg Kroah-Hartman */ 1033ab4382d2SGreg Kroah-Hartman if (mutex_lock_interruptible(&port->mutex)) 1034ab4382d2SGreg Kroah-Hartman return -ERESTARTSYS; 1035ab4382d2SGreg Kroah-Hartman 1036ab4382d2SGreg Kroah-Hartman ret = -EBUSY; 1037ab4382d2SGreg Kroah-Hartman if (tty_port_users(port) == 1) { 1038ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 1039ab4382d2SGreg Kroah-Hartman 1040ab4382d2SGreg Kroah-Hartman /* 1041ab4382d2SGreg Kroah-Hartman * If we already have a port type configured, 1042ab4382d2SGreg Kroah-Hartman * we must release its resources. 1043ab4382d2SGreg Kroah-Hartman */ 1044ab4382d2SGreg Kroah-Hartman if (uport->type != PORT_UNKNOWN) 1045ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 1046ab4382d2SGreg Kroah-Hartman 1047ab4382d2SGreg Kroah-Hartman flags = UART_CONFIG_TYPE; 1048ab4382d2SGreg Kroah-Hartman if (uport->flags & UPF_AUTO_IRQ) 1049ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_IRQ; 1050ab4382d2SGreg Kroah-Hartman 1051ab4382d2SGreg Kroah-Hartman /* 1052ab4382d2SGreg Kroah-Hartman * This will claim the ports resources if 1053ab4382d2SGreg Kroah-Hartman * a port is found. 1054ab4382d2SGreg Kroah-Hartman */ 1055ab4382d2SGreg Kroah-Hartman uport->ops->config_port(uport, flags); 1056ab4382d2SGreg Kroah-Hartman 1057ab4382d2SGreg Kroah-Hartman ret = uart_startup(tty, state, 1); 1058ab4382d2SGreg Kroah-Hartman } 1059ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1060ab4382d2SGreg Kroah-Hartman return ret; 1061ab4382d2SGreg Kroah-Hartman } 1062ab4382d2SGreg Kroah-Hartman 10631fdc3106SAlexander Shiyan static void uart_enable_ms(struct uart_port *uport) 10641fdc3106SAlexander Shiyan { 10651fdc3106SAlexander Shiyan /* 10661fdc3106SAlexander Shiyan * Force modem status interrupts on 10671fdc3106SAlexander Shiyan */ 10681fdc3106SAlexander Shiyan if (uport->ops->enable_ms) 10691fdc3106SAlexander Shiyan uport->ops->enable_ms(uport); 10701fdc3106SAlexander Shiyan } 10711fdc3106SAlexander Shiyan 1072ab4382d2SGreg Kroah-Hartman /* 1073ab4382d2SGreg Kroah-Hartman * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change 1074ab4382d2SGreg Kroah-Hartman * - mask passed in arg for lines of interest 1075ab4382d2SGreg Kroah-Hartman * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) 1076ab4382d2SGreg Kroah-Hartman * Caller should use TIOCGICOUNT to see which one it was 1077ab4382d2SGreg Kroah-Hartman * 1078ab4382d2SGreg Kroah-Hartman * FIXME: This wants extracting into a common all driver implementation 1079ab4382d2SGreg Kroah-Hartman * of TIOCMWAIT using tty_port. 1080ab4382d2SGreg Kroah-Hartman */ 1081ab4382d2SGreg Kroah-Hartman static int 1082ab4382d2SGreg Kroah-Hartman uart_wait_modem_status(struct uart_state *state, unsigned long arg) 1083ab4382d2SGreg Kroah-Hartman { 1084ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1085ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1086ab4382d2SGreg Kroah-Hartman DECLARE_WAITQUEUE(wait, current); 1087ab4382d2SGreg Kroah-Hartman struct uart_icount cprev, cnow; 1088ab4382d2SGreg Kroah-Hartman int ret; 1089ab4382d2SGreg Kroah-Hartman 1090ab4382d2SGreg Kroah-Hartman /* 1091ab4382d2SGreg Kroah-Hartman * note the counters on entry 1092ab4382d2SGreg Kroah-Hartman */ 1093ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1094ab4382d2SGreg Kroah-Hartman memcpy(&cprev, &uport->icount, sizeof(struct uart_icount)); 10951fdc3106SAlexander Shiyan uart_enable_ms(uport); 1096ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1097ab4382d2SGreg Kroah-Hartman 1098ab4382d2SGreg Kroah-Hartman add_wait_queue(&port->delta_msr_wait, &wait); 1099ab4382d2SGreg Kroah-Hartman for (;;) { 1100ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1101ab4382d2SGreg Kroah-Hartman memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); 1102ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1103ab4382d2SGreg Kroah-Hartman 1104ab4382d2SGreg Kroah-Hartman set_current_state(TASK_INTERRUPTIBLE); 1105ab4382d2SGreg Kroah-Hartman 1106ab4382d2SGreg Kroah-Hartman if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || 1107ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || 1108ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || 1109ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) { 1110ab4382d2SGreg Kroah-Hartman ret = 0; 1111ab4382d2SGreg Kroah-Hartman break; 1112ab4382d2SGreg Kroah-Hartman } 1113ab4382d2SGreg Kroah-Hartman 1114ab4382d2SGreg Kroah-Hartman schedule(); 1115ab4382d2SGreg Kroah-Hartman 1116ab4382d2SGreg Kroah-Hartman /* see if a signal did it */ 1117ab4382d2SGreg Kroah-Hartman if (signal_pending(current)) { 1118ab4382d2SGreg Kroah-Hartman ret = -ERESTARTSYS; 1119ab4382d2SGreg Kroah-Hartman break; 1120ab4382d2SGreg Kroah-Hartman } 1121ab4382d2SGreg Kroah-Hartman 1122ab4382d2SGreg Kroah-Hartman cprev = cnow; 1123ab4382d2SGreg Kroah-Hartman } 112497f9f707SFabian Frederick __set_current_state(TASK_RUNNING); 1125ab4382d2SGreg Kroah-Hartman remove_wait_queue(&port->delta_msr_wait, &wait); 1126ab4382d2SGreg Kroah-Hartman 1127ab4382d2SGreg Kroah-Hartman return ret; 1128ab4382d2SGreg Kroah-Hartman } 1129ab4382d2SGreg Kroah-Hartman 1130ab4382d2SGreg Kroah-Hartman /* 1131ab4382d2SGreg Kroah-Hartman * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) 1132ab4382d2SGreg Kroah-Hartman * Return: write counters to the user passed counter struct 1133ab4382d2SGreg Kroah-Hartman * NB: both 1->0 and 0->1 transitions are counted except for 1134ab4382d2SGreg Kroah-Hartman * RI where only 0->1 is counted. 1135ab4382d2SGreg Kroah-Hartman */ 1136ab4382d2SGreg Kroah-Hartman static int uart_get_icount(struct tty_struct *tty, 1137ab4382d2SGreg Kroah-Hartman struct serial_icounter_struct *icount) 1138ab4382d2SGreg Kroah-Hartman { 1139ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1140ab4382d2SGreg Kroah-Hartman struct uart_icount cnow; 1141ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1142ab4382d2SGreg Kroah-Hartman 1143ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1144ab4382d2SGreg Kroah-Hartman memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); 1145ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1146ab4382d2SGreg Kroah-Hartman 1147ab4382d2SGreg Kroah-Hartman icount->cts = cnow.cts; 1148ab4382d2SGreg Kroah-Hartman icount->dsr = cnow.dsr; 1149ab4382d2SGreg Kroah-Hartman icount->rng = cnow.rng; 1150ab4382d2SGreg Kroah-Hartman icount->dcd = cnow.dcd; 1151ab4382d2SGreg Kroah-Hartman icount->rx = cnow.rx; 1152ab4382d2SGreg Kroah-Hartman icount->tx = cnow.tx; 1153ab4382d2SGreg Kroah-Hartman icount->frame = cnow.frame; 1154ab4382d2SGreg Kroah-Hartman icount->overrun = cnow.overrun; 1155ab4382d2SGreg Kroah-Hartman icount->parity = cnow.parity; 1156ab4382d2SGreg Kroah-Hartman icount->brk = cnow.brk; 1157ab4382d2SGreg Kroah-Hartman icount->buf_overrun = cnow.buf_overrun; 1158ab4382d2SGreg Kroah-Hartman 1159ab4382d2SGreg Kroah-Hartman return 0; 1160ab4382d2SGreg Kroah-Hartman } 1161ab4382d2SGreg Kroah-Hartman 1162a5f276f1SRicardo Ribalda Delgado static int uart_get_rs485_config(struct uart_port *port, 1163a5f276f1SRicardo Ribalda Delgado struct serial_rs485 __user *rs485) 1164a5f276f1SRicardo Ribalda Delgado { 1165bd737f87SRicardo Ribalda Delgado unsigned long flags; 1166bd737f87SRicardo Ribalda Delgado struct serial_rs485 aux; 1167bd737f87SRicardo Ribalda Delgado 1168bd737f87SRicardo Ribalda Delgado spin_lock_irqsave(&port->lock, flags); 1169bd737f87SRicardo Ribalda Delgado aux = port->rs485; 1170bd737f87SRicardo Ribalda Delgado spin_unlock_irqrestore(&port->lock, flags); 1171bd737f87SRicardo Ribalda Delgado 1172bd737f87SRicardo Ribalda Delgado if (copy_to_user(rs485, &aux, sizeof(aux))) 1173a5f276f1SRicardo Ribalda Delgado return -EFAULT; 1174bd737f87SRicardo Ribalda Delgado 1175a5f276f1SRicardo Ribalda Delgado return 0; 1176a5f276f1SRicardo Ribalda Delgado } 1177a5f276f1SRicardo Ribalda Delgado 1178a5f276f1SRicardo Ribalda Delgado static int uart_set_rs485_config(struct uart_port *port, 1179a5f276f1SRicardo Ribalda Delgado struct serial_rs485 __user *rs485_user) 1180a5f276f1SRicardo Ribalda Delgado { 1181a5f276f1SRicardo Ribalda Delgado struct serial_rs485 rs485; 1182a5f276f1SRicardo Ribalda Delgado int ret; 1183bd737f87SRicardo Ribalda Delgado unsigned long flags; 1184a5f276f1SRicardo Ribalda Delgado 1185a5f276f1SRicardo Ribalda Delgado if (!port->rs485_config) 1186a5f276f1SRicardo Ribalda Delgado return -ENOIOCTLCMD; 1187a5f276f1SRicardo Ribalda Delgado 1188a5f276f1SRicardo Ribalda Delgado if (copy_from_user(&rs485, rs485_user, sizeof(*rs485_user))) 1189a5f276f1SRicardo Ribalda Delgado return -EFAULT; 1190a5f276f1SRicardo Ribalda Delgado 1191bd737f87SRicardo Ribalda Delgado spin_lock_irqsave(&port->lock, flags); 1192a5f276f1SRicardo Ribalda Delgado ret = port->rs485_config(port, &rs485); 1193bd737f87SRicardo Ribalda Delgado spin_unlock_irqrestore(&port->lock, flags); 1194a5f276f1SRicardo Ribalda Delgado if (ret) 1195a5f276f1SRicardo Ribalda Delgado return ret; 1196a5f276f1SRicardo Ribalda Delgado 1197a5f276f1SRicardo Ribalda Delgado if (copy_to_user(rs485_user, &port->rs485, sizeof(port->rs485))) 1198a5f276f1SRicardo Ribalda Delgado return -EFAULT; 1199a5f276f1SRicardo Ribalda Delgado 1200a5f276f1SRicardo Ribalda Delgado return 0; 1201a5f276f1SRicardo Ribalda Delgado } 1202a5f276f1SRicardo Ribalda Delgado 1203ab4382d2SGreg Kroah-Hartman /* 1204ab4382d2SGreg Kroah-Hartman * Called via sys_ioctl. We can use spin_lock_irq() here. 1205ab4382d2SGreg Kroah-Hartman */ 1206ab4382d2SGreg Kroah-Hartman static int 12076caa76b7SAlan Cox uart_ioctl(struct tty_struct *tty, unsigned int cmd, 1208ab4382d2SGreg Kroah-Hartman unsigned long arg) 1209ab4382d2SGreg Kroah-Hartman { 1210ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1211ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1212ab4382d2SGreg Kroah-Hartman void __user *uarg = (void __user *)arg; 1213ab4382d2SGreg Kroah-Hartman int ret = -ENOIOCTLCMD; 1214ab4382d2SGreg Kroah-Hartman 1215ab4382d2SGreg Kroah-Hartman 1216ab4382d2SGreg Kroah-Hartman /* 1217ab4382d2SGreg Kroah-Hartman * These ioctls don't rely on the hardware to be present. 1218ab4382d2SGreg Kroah-Hartman */ 1219ab4382d2SGreg Kroah-Hartman switch (cmd) { 1220ab4382d2SGreg Kroah-Hartman case TIOCGSERIAL: 12219f109694SAlan Cox ret = uart_get_info_user(port, uarg); 1222ab4382d2SGreg Kroah-Hartman break; 1223ab4382d2SGreg Kroah-Hartman 1224ab4382d2SGreg Kroah-Hartman case TIOCSSERIAL: 12257c8ab967SPeter Hurley down_write(&tty->termios_rwsem); 12267ba2e769SAlan Cox ret = uart_set_info_user(tty, state, uarg); 12277c8ab967SPeter Hurley up_write(&tty->termios_rwsem); 1228ab4382d2SGreg Kroah-Hartman break; 1229ab4382d2SGreg Kroah-Hartman 1230ab4382d2SGreg Kroah-Hartman case TIOCSERCONFIG: 12317c8ab967SPeter Hurley down_write(&tty->termios_rwsem); 1232ab4382d2SGreg Kroah-Hartman ret = uart_do_autoconfig(tty, state); 12337c8ab967SPeter Hurley up_write(&tty->termios_rwsem); 1234ab4382d2SGreg Kroah-Hartman break; 1235ab4382d2SGreg Kroah-Hartman 1236ab4382d2SGreg Kroah-Hartman case TIOCSERGWILD: /* obsolete */ 1237ab4382d2SGreg Kroah-Hartman case TIOCSERSWILD: /* obsolete */ 1238ab4382d2SGreg Kroah-Hartman ret = 0; 1239ab4382d2SGreg Kroah-Hartman break; 1240ab4382d2SGreg Kroah-Hartman } 1241ab4382d2SGreg Kroah-Hartman 1242ab4382d2SGreg Kroah-Hartman if (ret != -ENOIOCTLCMD) 1243ab4382d2SGreg Kroah-Hartman goto out; 1244ab4382d2SGreg Kroah-Hartman 1245ab4382d2SGreg Kroah-Hartman if (tty->flags & (1 << TTY_IO_ERROR)) { 1246ab4382d2SGreg Kroah-Hartman ret = -EIO; 1247ab4382d2SGreg Kroah-Hartman goto out; 1248ab4382d2SGreg Kroah-Hartman } 1249ab4382d2SGreg Kroah-Hartman 1250ab4382d2SGreg Kroah-Hartman /* 1251ab4382d2SGreg Kroah-Hartman * The following should only be used when hardware is present. 1252ab4382d2SGreg Kroah-Hartman */ 1253ab4382d2SGreg Kroah-Hartman switch (cmd) { 1254ab4382d2SGreg Kroah-Hartman case TIOCMIWAIT: 1255ab4382d2SGreg Kroah-Hartman ret = uart_wait_modem_status(state, arg); 1256ab4382d2SGreg Kroah-Hartman break; 1257ab4382d2SGreg Kroah-Hartman } 1258ab4382d2SGreg Kroah-Hartman 1259ab4382d2SGreg Kroah-Hartman if (ret != -ENOIOCTLCMD) 1260ab4382d2SGreg Kroah-Hartman goto out; 1261ab4382d2SGreg Kroah-Hartman 1262ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1263ab4382d2SGreg Kroah-Hartman 12646caa76b7SAlan Cox if (tty->flags & (1 << TTY_IO_ERROR)) { 1265ab4382d2SGreg Kroah-Hartman ret = -EIO; 1266ab4382d2SGreg Kroah-Hartman goto out_up; 1267ab4382d2SGreg Kroah-Hartman } 1268ab4382d2SGreg Kroah-Hartman 1269ab4382d2SGreg Kroah-Hartman /* 1270ab4382d2SGreg Kroah-Hartman * All these rely on hardware being present and need to be 1271ab4382d2SGreg Kroah-Hartman * protected against the tty being hung up. 1272ab4382d2SGreg Kroah-Hartman */ 1273a9c20a9cSRicardo Ribalda Delgado 1274ab4382d2SGreg Kroah-Hartman switch (cmd) { 1275a9c20a9cSRicardo Ribalda Delgado case TIOCSERGETLSR: /* Get line status register */ 1276a9c20a9cSRicardo Ribalda Delgado ret = uart_get_lsr_info(tty, state, uarg); 1277a9c20a9cSRicardo Ribalda Delgado break; 1278a9c20a9cSRicardo Ribalda Delgado 1279a5f276f1SRicardo Ribalda Delgado case TIOCGRS485: 1280a5f276f1SRicardo Ribalda Delgado ret = uart_get_rs485_config(state->uart_port, uarg); 1281a5f276f1SRicardo Ribalda Delgado break; 1282a5f276f1SRicardo Ribalda Delgado 1283a5f276f1SRicardo Ribalda Delgado case TIOCSRS485: 1284a5f276f1SRicardo Ribalda Delgado ret = uart_set_rs485_config(state->uart_port, uarg); 1285a5f276f1SRicardo Ribalda Delgado break; 1286ab4382d2SGreg Kroah-Hartman default: { 1287ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1288ab4382d2SGreg Kroah-Hartman if (uport->ops->ioctl) 1289ab4382d2SGreg Kroah-Hartman ret = uport->ops->ioctl(uport, cmd, arg); 1290ab4382d2SGreg Kroah-Hartman break; 1291ab4382d2SGreg Kroah-Hartman } 1292ab4382d2SGreg Kroah-Hartman } 1293ab4382d2SGreg Kroah-Hartman out_up: 1294ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1295ab4382d2SGreg Kroah-Hartman out: 1296ab4382d2SGreg Kroah-Hartman return ret; 1297ab4382d2SGreg Kroah-Hartman } 1298ab4382d2SGreg Kroah-Hartman 1299ab4382d2SGreg Kroah-Hartman static void uart_set_ldisc(struct tty_struct *tty) 1300ab4382d2SGreg Kroah-Hartman { 1301ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1302ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1303ab4382d2SGreg Kroah-Hartman 1304db1b9dfcSPeter Hurley if (uport->ops->set_ldisc) { 1305db1b9dfcSPeter Hurley mutex_lock(&state->port.mutex); 1306732a84a0SPeter Hurley uport->ops->set_ldisc(uport, &tty->termios); 1307db1b9dfcSPeter Hurley mutex_unlock(&state->port.mutex); 1308db1b9dfcSPeter Hurley } 1309ab4382d2SGreg Kroah-Hartman } 1310ab4382d2SGreg Kroah-Hartman 1311ab4382d2SGreg Kroah-Hartman static void uart_set_termios(struct tty_struct *tty, 1312ab4382d2SGreg Kroah-Hartman struct ktermios *old_termios) 1313ab4382d2SGreg Kroah-Hartman { 1314ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1315dec94e70SRussell King struct uart_port *uport = state->uart_port; 1316adc8d746SAlan Cox unsigned int cflag = tty->termios.c_cflag; 13172cbacafdSRussell King unsigned int iflag_mask = IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK; 13182cbacafdSRussell King bool sw_changed = false; 1319ab4382d2SGreg Kroah-Hartman 13202cbacafdSRussell King /* 13212cbacafdSRussell King * Drivers doing software flow control also need to know 13222cbacafdSRussell King * about changes to these input settings. 13232cbacafdSRussell King */ 13242cbacafdSRussell King if (uport->flags & UPF_SOFT_FLOW) { 13252cbacafdSRussell King iflag_mask |= IXANY|IXON|IXOFF; 13262cbacafdSRussell King sw_changed = 13272cbacafdSRussell King tty->termios.c_cc[VSTART] != old_termios->c_cc[VSTART] || 13282cbacafdSRussell King tty->termios.c_cc[VSTOP] != old_termios->c_cc[VSTOP]; 13292cbacafdSRussell King } 1330ab4382d2SGreg Kroah-Hartman 1331ab4382d2SGreg Kroah-Hartman /* 1332ab4382d2SGreg Kroah-Hartman * These are the bits that are used to setup various 1333ab4382d2SGreg Kroah-Hartman * flags in the low level driver. We can ignore the Bfoo 1334ab4382d2SGreg Kroah-Hartman * bits in c_cflag; c_[io]speed will always be set 1335ab4382d2SGreg Kroah-Hartman * appropriately by set_termios() in tty_ioctl.c 1336ab4382d2SGreg Kroah-Hartman */ 1337ab4382d2SGreg Kroah-Hartman if ((cflag ^ old_termios->c_cflag) == 0 && 1338adc8d746SAlan Cox tty->termios.c_ospeed == old_termios->c_ospeed && 1339adc8d746SAlan Cox tty->termios.c_ispeed == old_termios->c_ispeed && 13402cbacafdSRussell King ((tty->termios.c_iflag ^ old_termios->c_iflag) & iflag_mask) == 0 && 13412cbacafdSRussell King !sw_changed) { 1342ab4382d2SGreg Kroah-Hartman return; 1343ab4382d2SGreg Kroah-Hartman } 1344ab4382d2SGreg Kroah-Hartman 13457c8ab967SPeter Hurley mutex_lock(&state->port.mutex); 1346ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, old_termios); 13477c8ab967SPeter Hurley mutex_unlock(&state->port.mutex); 1348c18b55fdSPeter Hurley /* reload cflag from termios; port driver may have overriden flags */ 1349c18b55fdSPeter Hurley cflag = tty->termios.c_cflag; 1350ab4382d2SGreg Kroah-Hartman 1351ab4382d2SGreg Kroah-Hartman /* Handle transition to B0 status */ 1352ab4382d2SGreg Kroah-Hartman if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) 1353dec94e70SRussell King uart_clear_mctrl(uport, TIOCM_RTS | TIOCM_DTR); 1354ab4382d2SGreg Kroah-Hartman /* Handle transition away from B0 status */ 1355ab4382d2SGreg Kroah-Hartman else if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { 1356ab4382d2SGreg Kroah-Hartman unsigned int mask = TIOCM_DTR; 135799abf3b9SPeter Hurley if (!(cflag & CRTSCTS) || !test_bit(TTY_THROTTLED, &tty->flags)) 1358ab4382d2SGreg Kroah-Hartman mask |= TIOCM_RTS; 1359dec94e70SRussell King uart_set_mctrl(uport, mask); 1360ab4382d2SGreg Kroah-Hartman } 1361ab4382d2SGreg Kroah-Hartman } 1362ab4382d2SGreg Kroah-Hartman 1363ab4382d2SGreg Kroah-Hartman /* 1364ef4f527cSKevin Cernekee * Calls to uart_close() are serialised via the tty_lock in 1365ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:tty_release() 1366ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:do_tty_hangup() 1367ef4f527cSKevin Cernekee * This runs from a workqueue and can sleep for a _short_ time only. 1368ab4382d2SGreg Kroah-Hartman */ 1369ab4382d2SGreg Kroah-Hartman static void uart_close(struct tty_struct *tty, struct file *filp) 1370ab4382d2SGreg Kroah-Hartman { 1371ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1372ab4382d2SGreg Kroah-Hartman struct tty_port *port; 1373ab4382d2SGreg Kroah-Hartman struct uart_port *uport; 1374ab4382d2SGreg Kroah-Hartman 137591b32f54SPeter Hurley if (!state) { 137691b32f54SPeter Hurley struct uart_driver *drv = tty->driver->driver_state; 137791b32f54SPeter Hurley 137891b32f54SPeter Hurley state = drv->state + tty->index; 137991b32f54SPeter Hurley port = &state->port; 138091b32f54SPeter Hurley spin_lock_irq(&port->lock); 138191b32f54SPeter Hurley --port->count; 138291b32f54SPeter Hurley spin_unlock_irq(&port->lock); 1383ab4382d2SGreg Kroah-Hartman return; 138491b32f54SPeter Hurley } 1385ab4382d2SGreg Kroah-Hartman 1386ab4382d2SGreg Kroah-Hartman uport = state->uart_port; 1387ab4382d2SGreg Kroah-Hartman port = &state->port; 1388ab4382d2SGreg Kroah-Hartman 13894ed94cd4SGeert Uytterhoeven pr_debug("uart_close(%d) called\n", uport ? uport->line : -1); 1390ab4382d2SGreg Kroah-Hartman 13914ed94cd4SGeert Uytterhoeven if (!port->count || tty_port_close_start(port, tty, filp) == 0) 139255956216SNobuhiro Iwamatsu return; 1393ab4382d2SGreg Kroah-Hartman 1394ab4382d2SGreg Kroah-Hartman /* 1395ab4382d2SGreg Kroah-Hartman * At this point, we stop accepting input. To do this, we 1396ab4382d2SGreg Kroah-Hartman * disable the receive line status interrupts. 1397ab4382d2SGreg Kroah-Hartman */ 1398ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_INITIALIZED) { 13996fb98fb3SPeter Hurley spin_lock_irq(&uport->lock); 1400ab4382d2SGreg Kroah-Hartman uport->ops->stop_rx(uport); 14016fb98fb3SPeter Hurley spin_unlock_irq(&uport->lock); 1402ab4382d2SGreg Kroah-Hartman /* 1403ab4382d2SGreg Kroah-Hartman * Before we drop DTR, make sure the UART transmitter 1404ab4382d2SGreg Kroah-Hartman * has completely drained; this is especially 1405ab4382d2SGreg Kroah-Hartman * important if there is a transmit FIFO! 1406ab4382d2SGreg Kroah-Hartman */ 14071f33a51dSJiri Slaby uart_wait_until_sent(tty, uport->timeout); 1408ab4382d2SGreg Kroah-Hartman } 1409ab4382d2SGreg Kroah-Hartman 1410bafb0bd2SJiri Slaby mutex_lock(&port->mutex); 1411ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 1412ab4382d2SGreg Kroah-Hartman tty_port_tty_set(port, NULL); 1413e144c58cSPeter Hurley 14146fb98fb3SPeter Hurley spin_lock_irq(&port->lock); 1415ab4382d2SGreg Kroah-Hartman 1416ab4382d2SGreg Kroah-Hartman if (port->blocked_open) { 14176fb98fb3SPeter Hurley spin_unlock_irq(&port->lock); 1418ab4382d2SGreg Kroah-Hartman if (port->close_delay) 141974866e75SPeter Hurley msleep_interruptible(jiffies_to_msecs(port->close_delay)); 14206fb98fb3SPeter Hurley spin_lock_irq(&port->lock); 1421ab4382d2SGreg Kroah-Hartman } else if (!uart_console(uport)) { 14226fb98fb3SPeter Hurley spin_unlock_irq(&port->lock); 14236f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_OFF); 14246fb98fb3SPeter Hurley spin_lock_irq(&port->lock); 1425ab4382d2SGreg Kroah-Hartman } 1426ab4382d2SGreg Kroah-Hartman 1427ab4382d2SGreg Kroah-Hartman /* 1428ab4382d2SGreg Kroah-Hartman * Wake up anyone trying to open this port. 1429ab4382d2SGreg Kroah-Hartman */ 1430ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); 1431426929f8SJiri Slaby clear_bit(ASYNCB_CLOSING, &port->flags); 14326fb98fb3SPeter Hurley spin_unlock_irq(&port->lock); 1433ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->open_wait); 1434ab4382d2SGreg Kroah-Hartman 1435ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 14362e758910SPeter Hurley 14372e758910SPeter Hurley tty_ldisc_flush(tty); 1438e144c58cSPeter Hurley tty->closing = 0; 1439ab4382d2SGreg Kroah-Hartman } 1440ab4382d2SGreg Kroah-Hartman 14411f33a51dSJiri Slaby static void uart_wait_until_sent(struct tty_struct *tty, int timeout) 1442ab4382d2SGreg Kroah-Hartman { 14431f33a51dSJiri Slaby struct uart_state *state = tty->driver_data; 14441f33a51dSJiri Slaby struct uart_port *port = state->uart_port; 1445ab4382d2SGreg Kroah-Hartman unsigned long char_time, expire; 1446ab4382d2SGreg Kroah-Hartman 1447ab4382d2SGreg Kroah-Hartman if (port->type == PORT_UNKNOWN || port->fifosize == 0) 1448ab4382d2SGreg Kroah-Hartman return; 1449ab4382d2SGreg Kroah-Hartman 1450ab4382d2SGreg Kroah-Hartman /* 1451ab4382d2SGreg Kroah-Hartman * Set the check interval to be 1/5 of the estimated time to 1452ab4382d2SGreg Kroah-Hartman * send a single character, and make it at least 1. The check 1453ab4382d2SGreg Kroah-Hartman * interval should also be less than the timeout. 1454ab4382d2SGreg Kroah-Hartman * 1455ab4382d2SGreg Kroah-Hartman * Note: we have to use pretty tight timings here to satisfy 1456ab4382d2SGreg Kroah-Hartman * the NIST-PCTS. 1457ab4382d2SGreg Kroah-Hartman */ 1458ab4382d2SGreg Kroah-Hartman char_time = (port->timeout - HZ/50) / port->fifosize; 1459ab4382d2SGreg Kroah-Hartman char_time = char_time / 5; 1460ab4382d2SGreg Kroah-Hartman if (char_time == 0) 1461ab4382d2SGreg Kroah-Hartman char_time = 1; 1462ab4382d2SGreg Kroah-Hartman if (timeout && timeout < char_time) 1463ab4382d2SGreg Kroah-Hartman char_time = timeout; 1464ab4382d2SGreg Kroah-Hartman 1465ab4382d2SGreg Kroah-Hartman /* 1466ab4382d2SGreg Kroah-Hartman * If the transmitter hasn't cleared in twice the approximate 1467ab4382d2SGreg Kroah-Hartman * amount of time to send the entire FIFO, it probably won't 1468ab4382d2SGreg Kroah-Hartman * ever clear. This assumes the UART isn't doing flow 1469ab4382d2SGreg Kroah-Hartman * control, which is currently the case. Hence, if it ever 1470ab4382d2SGreg Kroah-Hartman * takes longer than port->timeout, this is probably due to a 1471ab4382d2SGreg Kroah-Hartman * UART bug of some kind. So, we clamp the timeout parameter at 1472ab4382d2SGreg Kroah-Hartman * 2*port->timeout. 1473ab4382d2SGreg Kroah-Hartman */ 1474ab4382d2SGreg Kroah-Hartman if (timeout == 0 || timeout > 2 * port->timeout) 1475ab4382d2SGreg Kroah-Hartman timeout = 2 * port->timeout; 1476ab4382d2SGreg Kroah-Hartman 1477ab4382d2SGreg Kroah-Hartman expire = jiffies + timeout; 1478ab4382d2SGreg Kroah-Hartman 1479ab4382d2SGreg Kroah-Hartman pr_debug("uart_wait_until_sent(%d), jiffies=%lu, expire=%lu...\n", 1480ab4382d2SGreg Kroah-Hartman port->line, jiffies, expire); 1481ab4382d2SGreg Kroah-Hartman 1482ab4382d2SGreg Kroah-Hartman /* 1483ab4382d2SGreg Kroah-Hartman * Check whether the transmitter is empty every 'char_time'. 1484ab4382d2SGreg Kroah-Hartman * 'timeout' / 'expire' give us the maximum amount of time 1485ab4382d2SGreg Kroah-Hartman * we wait. 1486ab4382d2SGreg Kroah-Hartman */ 1487ab4382d2SGreg Kroah-Hartman while (!port->ops->tx_empty(port)) { 1488ab4382d2SGreg Kroah-Hartman msleep_interruptible(jiffies_to_msecs(char_time)); 1489ab4382d2SGreg Kroah-Hartman if (signal_pending(current)) 1490ab4382d2SGreg Kroah-Hartman break; 1491ab4382d2SGreg Kroah-Hartman if (time_after(jiffies, expire)) 1492ab4382d2SGreg Kroah-Hartman break; 1493ab4382d2SGreg Kroah-Hartman } 1494ab4382d2SGreg Kroah-Hartman } 1495ab4382d2SGreg Kroah-Hartman 1496ab4382d2SGreg Kroah-Hartman /* 1497ef4f527cSKevin Cernekee * Calls to uart_hangup() are serialised by the tty_lock in 1498ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:do_tty_hangup() 1499ef4f527cSKevin Cernekee * This runs from a workqueue and can sleep for a _short_ time only. 1500ab4382d2SGreg Kroah-Hartman */ 1501ab4382d2SGreg Kroah-Hartman static void uart_hangup(struct tty_struct *tty) 1502ab4382d2SGreg Kroah-Hartman { 1503ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1504ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1505ab4382d2SGreg Kroah-Hartman unsigned long flags; 1506ab4382d2SGreg Kroah-Hartman 1507ab4382d2SGreg Kroah-Hartman pr_debug("uart_hangup(%d)\n", state->uart_port->line); 1508ab4382d2SGreg Kroah-Hartman 1509ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1510ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_NORMAL_ACTIVE) { 1511ab4382d2SGreg Kroah-Hartman uart_flush_buffer(tty); 1512ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 1513ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 1514ab4382d2SGreg Kroah-Hartman port->count = 0; 1515ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); 1516ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 1517ab4382d2SGreg Kroah-Hartman tty_port_tty_set(port, NULL); 1518bf903c0cSGeert Uytterhoeven if (!uart_console(state->uart_port)) 1519bf903c0cSGeert Uytterhoeven uart_change_pm(state, UART_PM_STATE_OFF); 1520ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->open_wait); 1521ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->delta_msr_wait); 1522ab4382d2SGreg Kroah-Hartman } 1523ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1524ab4382d2SGreg Kroah-Hartman } 1525ab4382d2SGreg Kroah-Hartman 15260b1db830SJiri Slaby static void uart_port_shutdown(struct tty_port *port) 15270b1db830SJiri Slaby { 1528b922e19dSJiri Slaby struct uart_state *state = container_of(port, struct uart_state, port); 1529b922e19dSJiri Slaby struct uart_port *uport = state->uart_port; 1530b922e19dSJiri Slaby 1531b922e19dSJiri Slaby /* 1532b922e19dSJiri Slaby * clear delta_msr_wait queue to avoid mem leaks: we may free 1533b922e19dSJiri Slaby * the irq here so the queue might never be woken up. Note 1534b922e19dSJiri Slaby * that we won't end up waiting on delta_msr_wait again since 1535b922e19dSJiri Slaby * any outstanding file descriptors should be pointing at 1536b922e19dSJiri Slaby * hung_up_tty_fops now. 1537b922e19dSJiri Slaby */ 1538b922e19dSJiri Slaby wake_up_interruptible(&port->delta_msr_wait); 1539b922e19dSJiri Slaby 1540b922e19dSJiri Slaby /* 1541b922e19dSJiri Slaby * Free the IRQ and disable the port. 1542b922e19dSJiri Slaby */ 1543b922e19dSJiri Slaby uport->ops->shutdown(uport); 1544b922e19dSJiri Slaby 1545b922e19dSJiri Slaby /* 1546b922e19dSJiri Slaby * Ensure that the IRQ handler isn't running on another CPU. 1547b922e19dSJiri Slaby */ 1548b922e19dSJiri Slaby synchronize_irq(uport->irq); 15490b1db830SJiri Slaby } 15500b1db830SJiri Slaby 1551ab4382d2SGreg Kroah-Hartman static int uart_carrier_raised(struct tty_port *port) 1552ab4382d2SGreg Kroah-Hartman { 1553ab4382d2SGreg Kroah-Hartman struct uart_state *state = container_of(port, struct uart_state, port); 1554ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1555ab4382d2SGreg Kroah-Hartman int mctrl; 1556ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 15571fdc3106SAlexander Shiyan uart_enable_ms(uport); 1558ab4382d2SGreg Kroah-Hartman mctrl = uport->ops->get_mctrl(uport); 1559ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1560ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_CAR) 1561ab4382d2SGreg Kroah-Hartman return 1; 1562ab4382d2SGreg Kroah-Hartman return 0; 1563ab4382d2SGreg Kroah-Hartman } 1564ab4382d2SGreg Kroah-Hartman 1565ab4382d2SGreg Kroah-Hartman static void uart_dtr_rts(struct tty_port *port, int onoff) 1566ab4382d2SGreg Kroah-Hartman { 1567ab4382d2SGreg Kroah-Hartman struct uart_state *state = container_of(port, struct uart_state, port); 1568ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1569ab4382d2SGreg Kroah-Hartman 15706f5c24adSJiri Slaby if (onoff) 1571ab4382d2SGreg Kroah-Hartman uart_set_mctrl(uport, TIOCM_DTR | TIOCM_RTS); 1572ab4382d2SGreg Kroah-Hartman else 1573ab4382d2SGreg Kroah-Hartman uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); 1574ab4382d2SGreg Kroah-Hartman } 1575ab4382d2SGreg Kroah-Hartman 1576ab4382d2SGreg Kroah-Hartman /* 1577ef4f527cSKevin Cernekee * Calls to uart_open are serialised by the tty_lock in 1578ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:tty_open() 1579ab4382d2SGreg Kroah-Hartman * Note that if this fails, then uart_close() _will_ be called. 1580ab4382d2SGreg Kroah-Hartman * 1581ab4382d2SGreg Kroah-Hartman * In time, we want to scrap the "opening nonpresent ports" 1582ab4382d2SGreg Kroah-Hartman * behaviour and implement an alternative way for setserial 1583ab4382d2SGreg Kroah-Hartman * to set base addresses/ports/types. This will allow us to 1584ab4382d2SGreg Kroah-Hartman * get rid of a certain amount of extra tests. 1585ab4382d2SGreg Kroah-Hartman */ 1586ab4382d2SGreg Kroah-Hartman static int uart_open(struct tty_struct *tty, struct file *filp) 1587ab4382d2SGreg Kroah-Hartman { 1588ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = (struct uart_driver *)tty->driver->driver_state; 1589ab4382d2SGreg Kroah-Hartman int retval, line = tty->index; 15901c7b13c4SJiri Slaby struct uart_state *state = drv->state + line; 15911c7b13c4SJiri Slaby struct tty_port *port = &state->port; 1592ab4382d2SGreg Kroah-Hartman 1593ab4382d2SGreg Kroah-Hartman pr_debug("uart_open(%d) called\n", line); 1594ab4382d2SGreg Kroah-Hartman 159591b32f54SPeter Hurley spin_lock_irq(&port->lock); 159691b32f54SPeter Hurley ++port->count; 159791b32f54SPeter Hurley spin_unlock_irq(&port->lock); 159891b32f54SPeter Hurley 1599ab4382d2SGreg Kroah-Hartman /* 16001c7b13c4SJiri Slaby * We take the semaphore here to guarantee that we won't be re-entered 16011c7b13c4SJiri Slaby * while allocating the state structure, or while we request any IRQs 16021c7b13c4SJiri Slaby * that the driver may need. This also has the nice side-effect that 16031c7b13c4SJiri Slaby * it delays the action of uart_hangup, so we can guarantee that 16041c7b13c4SJiri Slaby * state->port.tty will always contain something reasonable. 1605ab4382d2SGreg Kroah-Hartman */ 16061c7b13c4SJiri Slaby if (mutex_lock_interruptible(&port->mutex)) { 16071c7b13c4SJiri Slaby retval = -ERESTARTSYS; 16081c7b13c4SJiri Slaby goto end; 1609ab4382d2SGreg Kroah-Hartman } 16101c7b13c4SJiri Slaby 16111c7b13c4SJiri Slaby if (!state->uart_port || state->uart_port->flags & UPF_DEAD) { 16121c7b13c4SJiri Slaby retval = -ENXIO; 161391b32f54SPeter Hurley goto err_unlock; 16141c7b13c4SJiri Slaby } 1615ab4382d2SGreg Kroah-Hartman 1616ab4382d2SGreg Kroah-Hartman tty->driver_data = state; 1617ab4382d2SGreg Kroah-Hartman state->uart_port->state = state; 1618d6c53c0eSJiri Slaby state->port.low_latency = 1619d6c53c0eSJiri Slaby (state->uart_port->flags & UPF_LOW_LATENCY) ? 1 : 0; 1620ab4382d2SGreg Kroah-Hartman tty_port_tty_set(port, tty); 1621ab4382d2SGreg Kroah-Hartman 1622ab4382d2SGreg Kroah-Hartman /* 1623ab4382d2SGreg Kroah-Hartman * Start up the serial port. 1624ab4382d2SGreg Kroah-Hartman */ 1625ab4382d2SGreg Kroah-Hartman retval = uart_startup(tty, state, 0); 1626ab4382d2SGreg Kroah-Hartman 1627ab4382d2SGreg Kroah-Hartman /* 1628ab4382d2SGreg Kroah-Hartman * If we succeeded, wait until the port is ready. 1629ab4382d2SGreg Kroah-Hartman */ 1630ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1631ab4382d2SGreg Kroah-Hartman if (retval == 0) 1632ab4382d2SGreg Kroah-Hartman retval = tty_port_block_til_ready(port, tty, filp); 1633ab4382d2SGreg Kroah-Hartman 16341c7b13c4SJiri Slaby end: 1635ab4382d2SGreg Kroah-Hartman return retval; 163691b32f54SPeter Hurley err_unlock: 16371c7b13c4SJiri Slaby mutex_unlock(&port->mutex); 16381c7b13c4SJiri Slaby goto end; 1639ab4382d2SGreg Kroah-Hartman } 1640ab4382d2SGreg Kroah-Hartman 1641ab4382d2SGreg Kroah-Hartman static const char *uart_type(struct uart_port *port) 1642ab4382d2SGreg Kroah-Hartman { 1643ab4382d2SGreg Kroah-Hartman const char *str = NULL; 1644ab4382d2SGreg Kroah-Hartman 1645ab4382d2SGreg Kroah-Hartman if (port->ops->type) 1646ab4382d2SGreg Kroah-Hartman str = port->ops->type(port); 1647ab4382d2SGreg Kroah-Hartman 1648ab4382d2SGreg Kroah-Hartman if (!str) 1649ab4382d2SGreg Kroah-Hartman str = "unknown"; 1650ab4382d2SGreg Kroah-Hartman 1651ab4382d2SGreg Kroah-Hartman return str; 1652ab4382d2SGreg Kroah-Hartman } 1653ab4382d2SGreg Kroah-Hartman 1654ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_PROC_FS 1655ab4382d2SGreg Kroah-Hartman 1656ab4382d2SGreg Kroah-Hartman static void uart_line_info(struct seq_file *m, struct uart_driver *drv, int i) 1657ab4382d2SGreg Kroah-Hartman { 1658ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + i; 1659ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 16606f538fe3SLinus Walleij enum uart_pm_state pm_state; 1661ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1662ab4382d2SGreg Kroah-Hartman char stat_buf[32]; 1663ab4382d2SGreg Kroah-Hartman unsigned int status; 1664ab4382d2SGreg Kroah-Hartman int mmio; 1665ab4382d2SGreg Kroah-Hartman 1666ab4382d2SGreg Kroah-Hartman if (!uport) 1667ab4382d2SGreg Kroah-Hartman return; 1668ab4382d2SGreg Kroah-Hartman 1669ab4382d2SGreg Kroah-Hartman mmio = uport->iotype >= UPIO_MEM; 1670ab4382d2SGreg Kroah-Hartman seq_printf(m, "%d: uart:%s %s%08llX irq:%d", 1671ab4382d2SGreg Kroah-Hartman uport->line, uart_type(uport), 1672ab4382d2SGreg Kroah-Hartman mmio ? "mmio:0x" : "port:", 1673ab4382d2SGreg Kroah-Hartman mmio ? (unsigned long long)uport->mapbase 1674ab4382d2SGreg Kroah-Hartman : (unsigned long long)uport->iobase, 1675ab4382d2SGreg Kroah-Hartman uport->irq); 1676ab4382d2SGreg Kroah-Hartman 1677ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) { 1678ab4382d2SGreg Kroah-Hartman seq_putc(m, '\n'); 1679ab4382d2SGreg Kroah-Hartman return; 1680ab4382d2SGreg Kroah-Hartman } 1681ab4382d2SGreg Kroah-Hartman 1682ab4382d2SGreg Kroah-Hartman if (capable(CAP_SYS_ADMIN)) { 1683ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1684ab4382d2SGreg Kroah-Hartman pm_state = state->pm_state; 16856f538fe3SLinus Walleij if (pm_state != UART_PM_STATE_ON) 16866f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 1687ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1688ab4382d2SGreg Kroah-Hartman status = uport->ops->get_mctrl(uport); 1689ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 16906f538fe3SLinus Walleij if (pm_state != UART_PM_STATE_ON) 1691ab4382d2SGreg Kroah-Hartman uart_change_pm(state, pm_state); 1692ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1693ab4382d2SGreg Kroah-Hartman 1694ab4382d2SGreg Kroah-Hartman seq_printf(m, " tx:%d rx:%d", 1695ab4382d2SGreg Kroah-Hartman uport->icount.tx, uport->icount.rx); 1696ab4382d2SGreg Kroah-Hartman if (uport->icount.frame) 1697ab4382d2SGreg Kroah-Hartman seq_printf(m, " fe:%d", 1698ab4382d2SGreg Kroah-Hartman uport->icount.frame); 1699ab4382d2SGreg Kroah-Hartman if (uport->icount.parity) 1700ab4382d2SGreg Kroah-Hartman seq_printf(m, " pe:%d", 1701ab4382d2SGreg Kroah-Hartman uport->icount.parity); 1702ab4382d2SGreg Kroah-Hartman if (uport->icount.brk) 1703ab4382d2SGreg Kroah-Hartman seq_printf(m, " brk:%d", 1704ab4382d2SGreg Kroah-Hartman uport->icount.brk); 1705ab4382d2SGreg Kroah-Hartman if (uport->icount.overrun) 1706ab4382d2SGreg Kroah-Hartman seq_printf(m, " oe:%d", 1707ab4382d2SGreg Kroah-Hartman uport->icount.overrun); 1708ab4382d2SGreg Kroah-Hartman 1709ab4382d2SGreg Kroah-Hartman #define INFOBIT(bit, str) \ 1710ab4382d2SGreg Kroah-Hartman if (uport->mctrl & (bit)) \ 1711ab4382d2SGreg Kroah-Hartman strncat(stat_buf, (str), sizeof(stat_buf) - \ 1712ab4382d2SGreg Kroah-Hartman strlen(stat_buf) - 2) 1713ab4382d2SGreg Kroah-Hartman #define STATBIT(bit, str) \ 1714ab4382d2SGreg Kroah-Hartman if (status & (bit)) \ 1715ab4382d2SGreg Kroah-Hartman strncat(stat_buf, (str), sizeof(stat_buf) - \ 1716ab4382d2SGreg Kroah-Hartman strlen(stat_buf) - 2) 1717ab4382d2SGreg Kroah-Hartman 1718ab4382d2SGreg Kroah-Hartman stat_buf[0] = '\0'; 1719ab4382d2SGreg Kroah-Hartman stat_buf[1] = '\0'; 1720ab4382d2SGreg Kroah-Hartman INFOBIT(TIOCM_RTS, "|RTS"); 1721ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_CTS, "|CTS"); 1722ab4382d2SGreg Kroah-Hartman INFOBIT(TIOCM_DTR, "|DTR"); 1723ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_DSR, "|DSR"); 1724ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_CAR, "|CD"); 1725ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_RNG, "|RI"); 1726ab4382d2SGreg Kroah-Hartman if (stat_buf[0]) 1727ab4382d2SGreg Kroah-Hartman stat_buf[0] = ' '; 1728ab4382d2SGreg Kroah-Hartman 1729ab4382d2SGreg Kroah-Hartman seq_puts(m, stat_buf); 1730ab4382d2SGreg Kroah-Hartman } 1731ab4382d2SGreg Kroah-Hartman seq_putc(m, '\n'); 1732ab4382d2SGreg Kroah-Hartman #undef STATBIT 1733ab4382d2SGreg Kroah-Hartman #undef INFOBIT 1734ab4382d2SGreg Kroah-Hartman } 1735ab4382d2SGreg Kroah-Hartman 1736ab4382d2SGreg Kroah-Hartman static int uart_proc_show(struct seq_file *m, void *v) 1737ab4382d2SGreg Kroah-Hartman { 1738ab4382d2SGreg Kroah-Hartman struct tty_driver *ttydrv = m->private; 1739ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = ttydrv->driver_state; 1740ab4382d2SGreg Kroah-Hartman int i; 1741ab4382d2SGreg Kroah-Hartman 1742ab4382d2SGreg Kroah-Hartman seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n", 1743ab4382d2SGreg Kroah-Hartman "", "", ""); 1744ab4382d2SGreg Kroah-Hartman for (i = 0; i < drv->nr; i++) 1745ab4382d2SGreg Kroah-Hartman uart_line_info(m, drv, i); 1746ab4382d2SGreg Kroah-Hartman return 0; 1747ab4382d2SGreg Kroah-Hartman } 1748ab4382d2SGreg Kroah-Hartman 1749ab4382d2SGreg Kroah-Hartman static int uart_proc_open(struct inode *inode, struct file *file) 1750ab4382d2SGreg Kroah-Hartman { 1751d9dda78bSAl Viro return single_open(file, uart_proc_show, PDE_DATA(inode)); 1752ab4382d2SGreg Kroah-Hartman } 1753ab4382d2SGreg Kroah-Hartman 1754ab4382d2SGreg Kroah-Hartman static const struct file_operations uart_proc_fops = { 1755ab4382d2SGreg Kroah-Hartman .owner = THIS_MODULE, 1756ab4382d2SGreg Kroah-Hartman .open = uart_proc_open, 1757ab4382d2SGreg Kroah-Hartman .read = seq_read, 1758ab4382d2SGreg Kroah-Hartman .llseek = seq_lseek, 1759ab4382d2SGreg Kroah-Hartman .release = single_release, 1760ab4382d2SGreg Kroah-Hartman }; 1761ab4382d2SGreg Kroah-Hartman #endif 1762ab4382d2SGreg Kroah-Hartman 1763ab4382d2SGreg Kroah-Hartman #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL) 17641cfe42b7SPeter Hurley /** 1765ab4382d2SGreg Kroah-Hartman * uart_console_write - write a console message to a serial port 1766ab4382d2SGreg Kroah-Hartman * @port: the port to write the message 1767ab4382d2SGreg Kroah-Hartman * @s: array of characters 1768ab4382d2SGreg Kroah-Hartman * @count: number of characters in string to write 176910afbe34SPeter Hurley * @putchar: function to write character to port 1770ab4382d2SGreg Kroah-Hartman */ 1771ab4382d2SGreg Kroah-Hartman void uart_console_write(struct uart_port *port, const char *s, 1772ab4382d2SGreg Kroah-Hartman unsigned int count, 1773ab4382d2SGreg Kroah-Hartman void (*putchar)(struct uart_port *, int)) 1774ab4382d2SGreg Kroah-Hartman { 1775ab4382d2SGreg Kroah-Hartman unsigned int i; 1776ab4382d2SGreg Kroah-Hartman 1777ab4382d2SGreg Kroah-Hartman for (i = 0; i < count; i++, s++) { 1778ab4382d2SGreg Kroah-Hartman if (*s == '\n') 1779ab4382d2SGreg Kroah-Hartman putchar(port, '\r'); 1780ab4382d2SGreg Kroah-Hartman putchar(port, *s); 1781ab4382d2SGreg Kroah-Hartman } 1782ab4382d2SGreg Kroah-Hartman } 1783ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_console_write); 1784ab4382d2SGreg Kroah-Hartman 1785ab4382d2SGreg Kroah-Hartman /* 1786ab4382d2SGreg Kroah-Hartman * Check whether an invalid uart number has been specified, and 1787ab4382d2SGreg Kroah-Hartman * if so, search for the first available port that does have 1788ab4382d2SGreg Kroah-Hartman * console support. 1789ab4382d2SGreg Kroah-Hartman */ 1790ab4382d2SGreg Kroah-Hartman struct uart_port * __init 1791ab4382d2SGreg Kroah-Hartman uart_get_console(struct uart_port *ports, int nr, struct console *co) 1792ab4382d2SGreg Kroah-Hartman { 1793ab4382d2SGreg Kroah-Hartman int idx = co->index; 1794ab4382d2SGreg Kroah-Hartman 1795ab4382d2SGreg Kroah-Hartman if (idx < 0 || idx >= nr || (ports[idx].iobase == 0 && 1796ab4382d2SGreg Kroah-Hartman ports[idx].membase == NULL)) 1797ab4382d2SGreg Kroah-Hartman for (idx = 0; idx < nr; idx++) 1798ab4382d2SGreg Kroah-Hartman if (ports[idx].iobase != 0 || 1799ab4382d2SGreg Kroah-Hartman ports[idx].membase != NULL) 1800ab4382d2SGreg Kroah-Hartman break; 1801ab4382d2SGreg Kroah-Hartman 1802ab4382d2SGreg Kroah-Hartman co->index = idx; 1803ab4382d2SGreg Kroah-Hartman 1804ab4382d2SGreg Kroah-Hartman return ports + idx; 1805ab4382d2SGreg Kroah-Hartman } 1806ab4382d2SGreg Kroah-Hartman 1807ab4382d2SGreg Kroah-Hartman /** 180873abaf87SPeter Hurley * uart_parse_earlycon - Parse earlycon options 180973abaf87SPeter Hurley * @p: ptr to 2nd field (ie., just beyond '<name>,') 181073abaf87SPeter Hurley * @iotype: ptr for decoded iotype (out) 181173abaf87SPeter Hurley * @addr: ptr for decoded mapbase/iobase (out) 181273abaf87SPeter Hurley * @options: ptr for <options> field; NULL if not present (out) 181373abaf87SPeter Hurley * 181473abaf87SPeter Hurley * Decodes earlycon kernel command line parameters of the form 1815bd94c407SMasahiro Yamada * earlycon=<name>,io|mmio|mmio16|mmio32|mmio32be|mmio32native,<addr>,<options> 1816bd94c407SMasahiro Yamada * console=<name>,io|mmio|mmio16|mmio32|mmio32be|mmio32native,<addr>,<options> 181773abaf87SPeter Hurley * 181873abaf87SPeter Hurley * The optional form 181973abaf87SPeter Hurley * earlycon=<name>,0x<addr>,<options> 182073abaf87SPeter Hurley * console=<name>,0x<addr>,<options> 182173abaf87SPeter Hurley * is also accepted; the returned @iotype will be UPIO_MEM. 182273abaf87SPeter Hurley * 182373abaf87SPeter Hurley * Returns 0 on success or -EINVAL on failure 182473abaf87SPeter Hurley */ 182573abaf87SPeter Hurley int uart_parse_earlycon(char *p, unsigned char *iotype, unsigned long *addr, 182673abaf87SPeter Hurley char **options) 182773abaf87SPeter Hurley { 182873abaf87SPeter Hurley if (strncmp(p, "mmio,", 5) == 0) { 182973abaf87SPeter Hurley *iotype = UPIO_MEM; 183073abaf87SPeter Hurley p += 5; 1831bd94c407SMasahiro Yamada } else if (strncmp(p, "mmio16,", 7) == 0) { 1832bd94c407SMasahiro Yamada *iotype = UPIO_MEM16; 1833bd94c407SMasahiro Yamada p += 7; 183473abaf87SPeter Hurley } else if (strncmp(p, "mmio32,", 7) == 0) { 183573abaf87SPeter Hurley *iotype = UPIO_MEM32; 183673abaf87SPeter Hurley p += 7; 18376e63be3fSNoam Camus } else if (strncmp(p, "mmio32be,", 9) == 0) { 18386e63be3fSNoam Camus *iotype = UPIO_MEM32BE; 18396e63be3fSNoam Camus p += 9; 1840d215d809SMax Filippov } else if (strncmp(p, "mmio32native,", 13) == 0) { 1841d215d809SMax Filippov *iotype = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) ? 1842d215d809SMax Filippov UPIO_MEM32BE : UPIO_MEM32; 1843d215d809SMax Filippov p += 13; 184473abaf87SPeter Hurley } else if (strncmp(p, "io,", 3) == 0) { 184573abaf87SPeter Hurley *iotype = UPIO_PORT; 184673abaf87SPeter Hurley p += 3; 184773abaf87SPeter Hurley } else if (strncmp(p, "0x", 2) == 0) { 184873abaf87SPeter Hurley *iotype = UPIO_MEM; 184973abaf87SPeter Hurley } else { 185073abaf87SPeter Hurley return -EINVAL; 185173abaf87SPeter Hurley } 185273abaf87SPeter Hurley 185373abaf87SPeter Hurley *addr = simple_strtoul(p, NULL, 0); 185473abaf87SPeter Hurley p = strchr(p, ','); 185573abaf87SPeter Hurley if (p) 185673abaf87SPeter Hurley p++; 185773abaf87SPeter Hurley 185873abaf87SPeter Hurley *options = p; 185973abaf87SPeter Hurley return 0; 186073abaf87SPeter Hurley } 186173abaf87SPeter Hurley EXPORT_SYMBOL_GPL(uart_parse_earlycon); 186273abaf87SPeter Hurley 186373abaf87SPeter Hurley /** 186402088ca6SGeert Uytterhoeven * uart_parse_options - Parse serial port baud/parity/bits/flow control. 1865ab4382d2SGreg Kroah-Hartman * @options: pointer to option string 1866ab4382d2SGreg Kroah-Hartman * @baud: pointer to an 'int' variable for the baud rate. 1867ab4382d2SGreg Kroah-Hartman * @parity: pointer to an 'int' variable for the parity. 1868ab4382d2SGreg Kroah-Hartman * @bits: pointer to an 'int' variable for the number of data bits. 1869ab4382d2SGreg Kroah-Hartman * @flow: pointer to an 'int' variable for the flow control character. 1870ab4382d2SGreg Kroah-Hartman * 1871ab4382d2SGreg Kroah-Hartman * uart_parse_options decodes a string containing the serial console 1872ab4382d2SGreg Kroah-Hartman * options. The format of the string is <baud><parity><bits><flow>, 1873ab4382d2SGreg Kroah-Hartman * eg: 115200n8r 1874ab4382d2SGreg Kroah-Hartman */ 1875ab4382d2SGreg Kroah-Hartman void 1876ab4382d2SGreg Kroah-Hartman uart_parse_options(char *options, int *baud, int *parity, int *bits, int *flow) 1877ab4382d2SGreg Kroah-Hartman { 1878ab4382d2SGreg Kroah-Hartman char *s = options; 1879ab4382d2SGreg Kroah-Hartman 1880ab4382d2SGreg Kroah-Hartman *baud = simple_strtoul(s, NULL, 10); 1881ab4382d2SGreg Kroah-Hartman while (*s >= '0' && *s <= '9') 1882ab4382d2SGreg Kroah-Hartman s++; 1883ab4382d2SGreg Kroah-Hartman if (*s) 1884ab4382d2SGreg Kroah-Hartman *parity = *s++; 1885ab4382d2SGreg Kroah-Hartman if (*s) 1886ab4382d2SGreg Kroah-Hartman *bits = *s++ - '0'; 1887ab4382d2SGreg Kroah-Hartman if (*s) 1888ab4382d2SGreg Kroah-Hartman *flow = *s; 1889ab4382d2SGreg Kroah-Hartman } 1890ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_parse_options); 1891ab4382d2SGreg Kroah-Hartman 1892ab4382d2SGreg Kroah-Hartman struct baud_rates { 1893ab4382d2SGreg Kroah-Hartman unsigned int rate; 1894ab4382d2SGreg Kroah-Hartman unsigned int cflag; 1895ab4382d2SGreg Kroah-Hartman }; 1896ab4382d2SGreg Kroah-Hartman 1897ab4382d2SGreg Kroah-Hartman static const struct baud_rates baud_rates[] = { 1898ab4382d2SGreg Kroah-Hartman { 921600, B921600 }, 1899ab4382d2SGreg Kroah-Hartman { 460800, B460800 }, 1900ab4382d2SGreg Kroah-Hartman { 230400, B230400 }, 1901ab4382d2SGreg Kroah-Hartman { 115200, B115200 }, 1902ab4382d2SGreg Kroah-Hartman { 57600, B57600 }, 1903ab4382d2SGreg Kroah-Hartman { 38400, B38400 }, 1904ab4382d2SGreg Kroah-Hartman { 19200, B19200 }, 1905ab4382d2SGreg Kroah-Hartman { 9600, B9600 }, 1906ab4382d2SGreg Kroah-Hartman { 4800, B4800 }, 1907ab4382d2SGreg Kroah-Hartman { 2400, B2400 }, 1908ab4382d2SGreg Kroah-Hartman { 1200, B1200 }, 1909ab4382d2SGreg Kroah-Hartman { 0, B38400 } 1910ab4382d2SGreg Kroah-Hartman }; 1911ab4382d2SGreg Kroah-Hartman 1912ab4382d2SGreg Kroah-Hartman /** 1913ab4382d2SGreg Kroah-Hartman * uart_set_options - setup the serial console parameters 1914ab4382d2SGreg Kroah-Hartman * @port: pointer to the serial ports uart_port structure 1915ab4382d2SGreg Kroah-Hartman * @co: console pointer 1916ab4382d2SGreg Kroah-Hartman * @baud: baud rate 1917ab4382d2SGreg Kroah-Hartman * @parity: parity character - 'n' (none), 'o' (odd), 'e' (even) 1918ab4382d2SGreg Kroah-Hartman * @bits: number of data bits 1919ab4382d2SGreg Kroah-Hartman * @flow: flow control character - 'r' (rts) 1920ab4382d2SGreg Kroah-Hartman */ 1921ab4382d2SGreg Kroah-Hartman int 1922ab4382d2SGreg Kroah-Hartman uart_set_options(struct uart_port *port, struct console *co, 1923ab4382d2SGreg Kroah-Hartman int baud, int parity, int bits, int flow) 1924ab4382d2SGreg Kroah-Hartman { 1925ab4382d2SGreg Kroah-Hartman struct ktermios termios; 1926ab4382d2SGreg Kroah-Hartman static struct ktermios dummy; 1927ab4382d2SGreg Kroah-Hartman int i; 1928ab4382d2SGreg Kroah-Hartman 1929ab4382d2SGreg Kroah-Hartman /* 1930ab4382d2SGreg Kroah-Hartman * Ensure that the serial console lock is initialised 1931ab4382d2SGreg Kroah-Hartman * early. 193242b6a1baSRandy Witt * If this port is a console, then the spinlock is already 193342b6a1baSRandy Witt * initialised. 1934ab4382d2SGreg Kroah-Hartman */ 193542b6a1baSRandy Witt if (!(uart_console(port) && (port->cons->flags & CON_ENABLED))) { 1936ab4382d2SGreg Kroah-Hartman spin_lock_init(&port->lock); 1937ab4382d2SGreg Kroah-Hartman lockdep_set_class(&port->lock, &port_lock_key); 193842b6a1baSRandy Witt } 1939ab4382d2SGreg Kroah-Hartman 1940ab4382d2SGreg Kroah-Hartman memset(&termios, 0, sizeof(struct ktermios)); 1941ab4382d2SGreg Kroah-Hartman 1942ab4382d2SGreg Kroah-Hartman termios.c_cflag = CREAD | HUPCL | CLOCAL; 1943ab4382d2SGreg Kroah-Hartman 1944ab4382d2SGreg Kroah-Hartman /* 1945ab4382d2SGreg Kroah-Hartman * Construct a cflag setting. 1946ab4382d2SGreg Kroah-Hartman */ 1947ab4382d2SGreg Kroah-Hartman for (i = 0; baud_rates[i].rate; i++) 1948ab4382d2SGreg Kroah-Hartman if (baud_rates[i].rate <= baud) 1949ab4382d2SGreg Kroah-Hartman break; 1950ab4382d2SGreg Kroah-Hartman 1951ab4382d2SGreg Kroah-Hartman termios.c_cflag |= baud_rates[i].cflag; 1952ab4382d2SGreg Kroah-Hartman 1953ab4382d2SGreg Kroah-Hartman if (bits == 7) 1954ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CS7; 1955ab4382d2SGreg Kroah-Hartman else 1956ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CS8; 1957ab4382d2SGreg Kroah-Hartman 1958ab4382d2SGreg Kroah-Hartman switch (parity) { 1959ab4382d2SGreg Kroah-Hartman case 'o': case 'O': 1960ab4382d2SGreg Kroah-Hartman termios.c_cflag |= PARODD; 1961ab4382d2SGreg Kroah-Hartman /*fall through*/ 1962ab4382d2SGreg Kroah-Hartman case 'e': case 'E': 1963ab4382d2SGreg Kroah-Hartman termios.c_cflag |= PARENB; 1964ab4382d2SGreg Kroah-Hartman break; 1965ab4382d2SGreg Kroah-Hartman } 1966ab4382d2SGreg Kroah-Hartman 1967ab4382d2SGreg Kroah-Hartman if (flow == 'r') 1968ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CRTSCTS; 1969ab4382d2SGreg Kroah-Hartman 1970ab4382d2SGreg Kroah-Hartman /* 1971ab4382d2SGreg Kroah-Hartman * some uarts on other side don't support no flow control. 1972ab4382d2SGreg Kroah-Hartman * So we set * DTR in host uart to make them happy 1973ab4382d2SGreg Kroah-Hartman */ 1974ab4382d2SGreg Kroah-Hartman port->mctrl |= TIOCM_DTR; 1975ab4382d2SGreg Kroah-Hartman 1976ab4382d2SGreg Kroah-Hartman port->ops->set_termios(port, &termios, &dummy); 1977ab4382d2SGreg Kroah-Hartman /* 1978ab4382d2SGreg Kroah-Hartman * Allow the setting of the UART parameters with a NULL console 1979ab4382d2SGreg Kroah-Hartman * too: 1980ab4382d2SGreg Kroah-Hartman */ 1981ab4382d2SGreg Kroah-Hartman if (co) 1982ab4382d2SGreg Kroah-Hartman co->cflag = termios.c_cflag; 1983ab4382d2SGreg Kroah-Hartman 1984ab4382d2SGreg Kroah-Hartman return 0; 1985ab4382d2SGreg Kroah-Hartman } 1986ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_set_options); 1987ab4382d2SGreg Kroah-Hartman #endif /* CONFIG_SERIAL_CORE_CONSOLE */ 1988ab4382d2SGreg Kroah-Hartman 1989cf75525fSJiri Slaby /** 1990cf75525fSJiri Slaby * uart_change_pm - set power state of the port 1991cf75525fSJiri Slaby * 1992cf75525fSJiri Slaby * @state: port descriptor 1993cf75525fSJiri Slaby * @pm_state: new state 1994cf75525fSJiri Slaby * 1995cf75525fSJiri Slaby * Locking: port->mutex has to be held 1996cf75525fSJiri Slaby */ 19976f538fe3SLinus Walleij static void uart_change_pm(struct uart_state *state, 19986f538fe3SLinus Walleij enum uart_pm_state pm_state) 1999ab4382d2SGreg Kroah-Hartman { 2000ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 2001ab4382d2SGreg Kroah-Hartman 2002ab4382d2SGreg Kroah-Hartman if (state->pm_state != pm_state) { 2003ab4382d2SGreg Kroah-Hartman if (port->ops->pm) 2004ab4382d2SGreg Kroah-Hartman port->ops->pm(port, pm_state, state->pm_state); 2005ab4382d2SGreg Kroah-Hartman state->pm_state = pm_state; 2006ab4382d2SGreg Kroah-Hartman } 2007ab4382d2SGreg Kroah-Hartman } 2008ab4382d2SGreg Kroah-Hartman 2009ab4382d2SGreg Kroah-Hartman struct uart_match { 2010ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2011ab4382d2SGreg Kroah-Hartman struct uart_driver *driver; 2012ab4382d2SGreg Kroah-Hartman }; 2013ab4382d2SGreg Kroah-Hartman 2014ab4382d2SGreg Kroah-Hartman static int serial_match_port(struct device *dev, void *data) 2015ab4382d2SGreg Kroah-Hartman { 2016ab4382d2SGreg Kroah-Hartman struct uart_match *match = data; 2017ab4382d2SGreg Kroah-Hartman struct tty_driver *tty_drv = match->driver->tty_driver; 2018ab4382d2SGreg Kroah-Hartman dev_t devt = MKDEV(tty_drv->major, tty_drv->minor_start) + 2019ab4382d2SGreg Kroah-Hartman match->port->line; 2020ab4382d2SGreg Kroah-Hartman 2021ab4382d2SGreg Kroah-Hartman return dev->devt == devt; /* Actually, only one tty per port */ 2022ab4382d2SGreg Kroah-Hartman } 2023ab4382d2SGreg Kroah-Hartman 2024ab4382d2SGreg Kroah-Hartman int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport) 2025ab4382d2SGreg Kroah-Hartman { 2026ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 2027ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2028ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 2029ab4382d2SGreg Kroah-Hartman struct uart_match match = {uport, drv}; 2030ab4382d2SGreg Kroah-Hartman 2031ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2032ab4382d2SGreg Kroah-Hartman 2033ab4382d2SGreg Kroah-Hartman tty_dev = device_find_child(uport->dev, &match, serial_match_port); 2034ab4382d2SGreg Kroah-Hartman if (device_may_wakeup(tty_dev)) { 2035ab4382d2SGreg Kroah-Hartman if (!enable_irq_wake(uport->irq)) 2036ab4382d2SGreg Kroah-Hartman uport->irq_wake = 1; 2037ab4382d2SGreg Kroah-Hartman put_device(tty_dev); 2038ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2039ab4382d2SGreg Kroah-Hartman return 0; 2040ab4382d2SGreg Kroah-Hartman } 20415a65dcc0SFederico Vaga put_device(tty_dev); 20425a65dcc0SFederico Vaga 2043b164c972SPeter Hurley /* Nothing to do if the console is not suspending */ 2044b164c972SPeter Hurley if (!console_suspend_enabled && uart_console(uport)) 2045b164c972SPeter Hurley goto unlock; 2046b164c972SPeter Hurley 2047ab4382d2SGreg Kroah-Hartman uport->suspended = 1; 2048ab4382d2SGreg Kroah-Hartman 2049ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_INITIALIZED) { 2050ab4382d2SGreg Kroah-Hartman const struct uart_ops *ops = uport->ops; 2051ab4382d2SGreg Kroah-Hartman int tries; 2052ab4382d2SGreg Kroah-Hartman 2053ab4382d2SGreg Kroah-Hartman set_bit(ASYNCB_SUSPENDED, &port->flags); 2054ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_INITIALIZED, &port->flags); 2055ab4382d2SGreg Kroah-Hartman 2056ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 2057ab4382d2SGreg Kroah-Hartman ops->stop_tx(uport); 2058ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, 0); 2059ab4382d2SGreg Kroah-Hartman ops->stop_rx(uport); 2060ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2061ab4382d2SGreg Kroah-Hartman 2062ab4382d2SGreg Kroah-Hartman /* 2063ab4382d2SGreg Kroah-Hartman * Wait for the transmitter to empty. 2064ab4382d2SGreg Kroah-Hartman */ 2065ab4382d2SGreg Kroah-Hartman for (tries = 3; !ops->tx_empty(uport) && tries; tries--) 2066ab4382d2SGreg Kroah-Hartman msleep(10); 2067ab4382d2SGreg Kroah-Hartman if (!tries) 20682f2dafe7SSudip Mukherjee dev_err(uport->dev, "%s%d: Unable to drain transmitter\n", 2069ab4382d2SGreg Kroah-Hartman drv->dev_name, 2070ab4382d2SGreg Kroah-Hartman drv->tty_driver->name_base + uport->line); 2071ab4382d2SGreg Kroah-Hartman 2072ab4382d2SGreg Kroah-Hartman ops->shutdown(uport); 2073ab4382d2SGreg Kroah-Hartman } 2074ab4382d2SGreg Kroah-Hartman 2075ab4382d2SGreg Kroah-Hartman /* 2076ab4382d2SGreg Kroah-Hartman * Disable the console device before suspending. 2077ab4382d2SGreg Kroah-Hartman */ 2078b164c972SPeter Hurley if (uart_console(uport)) 2079ab4382d2SGreg Kroah-Hartman console_stop(uport->cons); 2080ab4382d2SGreg Kroah-Hartman 20816f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_OFF); 2082b164c972SPeter Hurley unlock: 2083ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2084ab4382d2SGreg Kroah-Hartman 2085ab4382d2SGreg Kroah-Hartman return 0; 2086ab4382d2SGreg Kroah-Hartman } 2087ab4382d2SGreg Kroah-Hartman 2088ab4382d2SGreg Kroah-Hartman int uart_resume_port(struct uart_driver *drv, struct uart_port *uport) 2089ab4382d2SGreg Kroah-Hartman { 2090ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 2091ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2092ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 2093ab4382d2SGreg Kroah-Hartman struct uart_match match = {uport, drv}; 2094ab4382d2SGreg Kroah-Hartman struct ktermios termios; 2095ab4382d2SGreg Kroah-Hartman 2096ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2097ab4382d2SGreg Kroah-Hartman 2098ab4382d2SGreg Kroah-Hartman tty_dev = device_find_child(uport->dev, &match, serial_match_port); 2099ab4382d2SGreg Kroah-Hartman if (!uport->suspended && device_may_wakeup(tty_dev)) { 2100ab4382d2SGreg Kroah-Hartman if (uport->irq_wake) { 2101ab4382d2SGreg Kroah-Hartman disable_irq_wake(uport->irq); 2102ab4382d2SGreg Kroah-Hartman uport->irq_wake = 0; 2103ab4382d2SGreg Kroah-Hartman } 21045a65dcc0SFederico Vaga put_device(tty_dev); 2105ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2106ab4382d2SGreg Kroah-Hartman return 0; 2107ab4382d2SGreg Kroah-Hartman } 21085a65dcc0SFederico Vaga put_device(tty_dev); 2109ab4382d2SGreg Kroah-Hartman uport->suspended = 0; 2110ab4382d2SGreg Kroah-Hartman 2111ab4382d2SGreg Kroah-Hartman /* 2112ab4382d2SGreg Kroah-Hartman * Re-enable the console device after suspending. 2113ab4382d2SGreg Kroah-Hartman */ 21145933a161SYin Kangkai if (uart_console(uport)) { 2115ab4382d2SGreg Kroah-Hartman /* 2116ab4382d2SGreg Kroah-Hartman * First try to use the console cflag setting. 2117ab4382d2SGreg Kroah-Hartman */ 2118ab4382d2SGreg Kroah-Hartman memset(&termios, 0, sizeof(struct ktermios)); 2119ab4382d2SGreg Kroah-Hartman termios.c_cflag = uport->cons->cflag; 2120ab4382d2SGreg Kroah-Hartman 2121ab4382d2SGreg Kroah-Hartman /* 2122ab4382d2SGreg Kroah-Hartman * If that's unset, use the tty termios setting. 2123ab4382d2SGreg Kroah-Hartman */ 2124adc8d746SAlan Cox if (port->tty && termios.c_cflag == 0) 2125adc8d746SAlan Cox termios = port->tty->termios; 2126ab4382d2SGreg Kroah-Hartman 212794abc56fSNing Jiang if (console_suspend_enabled) 21286f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2129ab4382d2SGreg Kroah-Hartman uport->ops->set_termios(uport, &termios, NULL); 21305933a161SYin Kangkai if (console_suspend_enabled) 2131ab4382d2SGreg Kroah-Hartman console_start(uport->cons); 2132ab4382d2SGreg Kroah-Hartman } 2133ab4382d2SGreg Kroah-Hartman 2134ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_SUSPENDED) { 2135ab4382d2SGreg Kroah-Hartman const struct uart_ops *ops = uport->ops; 2136ab4382d2SGreg Kroah-Hartman int ret; 2137ab4382d2SGreg Kroah-Hartman 21386f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2139ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 2140ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, 0); 2141ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2142ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) { 2143ab4382d2SGreg Kroah-Hartman /* Protected by port mutex for now */ 2144ab4382d2SGreg Kroah-Hartman struct tty_struct *tty = port->tty; 2145ab4382d2SGreg Kroah-Hartman ret = ops->startup(uport); 2146ab4382d2SGreg Kroah-Hartman if (ret == 0) { 2147ab4382d2SGreg Kroah-Hartman if (tty) 2148ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 2149ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 2150ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, uport->mctrl); 2151ab4382d2SGreg Kroah-Hartman ops->start_tx(uport); 2152ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2153ab4382d2SGreg Kroah-Hartman set_bit(ASYNCB_INITIALIZED, &port->flags); 2154ab4382d2SGreg Kroah-Hartman } else { 2155ab4382d2SGreg Kroah-Hartman /* 2156ab4382d2SGreg Kroah-Hartman * Failed to resume - maybe hardware went away? 2157ab4382d2SGreg Kroah-Hartman * Clear the "initialized" flag so we won't try 2158ab4382d2SGreg Kroah-Hartman * to call the low level drivers shutdown method. 2159ab4382d2SGreg Kroah-Hartman */ 2160ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 2161ab4382d2SGreg Kroah-Hartman } 2162ab4382d2SGreg Kroah-Hartman } 2163ab4382d2SGreg Kroah-Hartman 2164ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_SUSPENDED, &port->flags); 2165ab4382d2SGreg Kroah-Hartman } 2166ab4382d2SGreg Kroah-Hartman 2167ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2168ab4382d2SGreg Kroah-Hartman 2169ab4382d2SGreg Kroah-Hartman return 0; 2170ab4382d2SGreg Kroah-Hartman } 2171ab4382d2SGreg Kroah-Hartman 2172ab4382d2SGreg Kroah-Hartman static inline void 2173ab4382d2SGreg Kroah-Hartman uart_report_port(struct uart_driver *drv, struct uart_port *port) 2174ab4382d2SGreg Kroah-Hartman { 2175ab4382d2SGreg Kroah-Hartman char address[64]; 2176ab4382d2SGreg Kroah-Hartman 2177ab4382d2SGreg Kroah-Hartman switch (port->iotype) { 2178ab4382d2SGreg Kroah-Hartman case UPIO_PORT: 2179ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), "I/O 0x%lx", port->iobase); 2180ab4382d2SGreg Kroah-Hartman break; 2181ab4382d2SGreg Kroah-Hartman case UPIO_HUB6: 2182ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), 2183ab4382d2SGreg Kroah-Hartman "I/O 0x%lx offset 0x%x", port->iobase, port->hub6); 2184ab4382d2SGreg Kroah-Hartman break; 2185ab4382d2SGreg Kroah-Hartman case UPIO_MEM: 2186bd94c407SMasahiro Yamada case UPIO_MEM16: 2187ab4382d2SGreg Kroah-Hartman case UPIO_MEM32: 21883ffb1a81SKevin Cernekee case UPIO_MEM32BE: 2189ab4382d2SGreg Kroah-Hartman case UPIO_AU: 2190ab4382d2SGreg Kroah-Hartman case UPIO_TSI: 2191ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), 2192ab4382d2SGreg Kroah-Hartman "MMIO 0x%llx", (unsigned long long)port->mapbase); 2193ab4382d2SGreg Kroah-Hartman break; 2194ab4382d2SGreg Kroah-Hartman default: 2195ab4382d2SGreg Kroah-Hartman strlcpy(address, "*unknown*", sizeof(address)); 2196ab4382d2SGreg Kroah-Hartman break; 2197ab4382d2SGreg Kroah-Hartman } 2198ab4382d2SGreg Kroah-Hartman 219968ed7e1cSJames Bottomley printk(KERN_INFO "%s%s%s%d at %s (irq = %d, base_baud = %d) is a %s\n", 220068ed7e1cSJames Bottomley port->dev ? dev_name(port->dev) : "", 220168ed7e1cSJames Bottomley port->dev ? ": " : "", 2202ab4382d2SGreg Kroah-Hartman drv->dev_name, 2203ab4382d2SGreg Kroah-Hartman drv->tty_driver->name_base + port->line, 22047d12b976SKees Cook address, port->irq, port->uartclk / 16, uart_type(port)); 2205ab4382d2SGreg Kroah-Hartman } 2206ab4382d2SGreg Kroah-Hartman 2207ab4382d2SGreg Kroah-Hartman static void 2208ab4382d2SGreg Kroah-Hartman uart_configure_port(struct uart_driver *drv, struct uart_state *state, 2209ab4382d2SGreg Kroah-Hartman struct uart_port *port) 2210ab4382d2SGreg Kroah-Hartman { 2211ab4382d2SGreg Kroah-Hartman unsigned int flags; 2212ab4382d2SGreg Kroah-Hartman 2213ab4382d2SGreg Kroah-Hartman /* 2214ab4382d2SGreg Kroah-Hartman * If there isn't a port here, don't do anything further. 2215ab4382d2SGreg Kroah-Hartman */ 2216ab4382d2SGreg Kroah-Hartman if (!port->iobase && !port->mapbase && !port->membase) 2217ab4382d2SGreg Kroah-Hartman return; 2218ab4382d2SGreg Kroah-Hartman 2219ab4382d2SGreg Kroah-Hartman /* 2220ab4382d2SGreg Kroah-Hartman * Now do the auto configuration stuff. Note that config_port 2221ab4382d2SGreg Kroah-Hartman * is expected to claim the resources and map the port for us. 2222ab4382d2SGreg Kroah-Hartman */ 2223ab4382d2SGreg Kroah-Hartman flags = 0; 2224ab4382d2SGreg Kroah-Hartman if (port->flags & UPF_AUTO_IRQ) 2225ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_IRQ; 2226ab4382d2SGreg Kroah-Hartman if (port->flags & UPF_BOOT_AUTOCONF) { 2227ab4382d2SGreg Kroah-Hartman if (!(port->flags & UPF_FIXED_TYPE)) { 2228ab4382d2SGreg Kroah-Hartman port->type = PORT_UNKNOWN; 2229ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_TYPE; 2230ab4382d2SGreg Kroah-Hartman } 2231ab4382d2SGreg Kroah-Hartman port->ops->config_port(port, flags); 2232ab4382d2SGreg Kroah-Hartman } 2233ab4382d2SGreg Kroah-Hartman 2234ab4382d2SGreg Kroah-Hartman if (port->type != PORT_UNKNOWN) { 2235ab4382d2SGreg Kroah-Hartman unsigned long flags; 2236ab4382d2SGreg Kroah-Hartman 2237ab4382d2SGreg Kroah-Hartman uart_report_port(drv, port); 2238ab4382d2SGreg Kroah-Hartman 2239ab4382d2SGreg Kroah-Hartman /* Power up port for set_mctrl() */ 22406f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2241ab4382d2SGreg Kroah-Hartman 2242ab4382d2SGreg Kroah-Hartman /* 2243ab4382d2SGreg Kroah-Hartman * Ensure that the modem control lines are de-activated. 2244ab4382d2SGreg Kroah-Hartman * keep the DTR setting that is set in uart_set_options() 2245ab4382d2SGreg Kroah-Hartman * We probably don't need a spinlock around this, but 2246ab4382d2SGreg Kroah-Hartman */ 2247ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 2248ab4382d2SGreg Kroah-Hartman port->ops->set_mctrl(port, port->mctrl & TIOCM_DTR); 2249ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 2250ab4382d2SGreg Kroah-Hartman 2251ab4382d2SGreg Kroah-Hartman /* 2252ab4382d2SGreg Kroah-Hartman * If this driver supports console, and it hasn't been 2253ab4382d2SGreg Kroah-Hartman * successfully registered yet, try to re-register it. 2254ab4382d2SGreg Kroah-Hartman * It may be that the port was not available. 2255ab4382d2SGreg Kroah-Hartman */ 2256ab4382d2SGreg Kroah-Hartman if (port->cons && !(port->cons->flags & CON_ENABLED)) 2257ab4382d2SGreg Kroah-Hartman register_console(port->cons); 2258ab4382d2SGreg Kroah-Hartman 2259ab4382d2SGreg Kroah-Hartman /* 2260ab4382d2SGreg Kroah-Hartman * Power down all ports by default, except the 2261ab4382d2SGreg Kroah-Hartman * console if we have one. 2262ab4382d2SGreg Kroah-Hartman */ 2263ab4382d2SGreg Kroah-Hartman if (!uart_console(port)) 22646f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_OFF); 2265ab4382d2SGreg Kroah-Hartman } 2266ab4382d2SGreg Kroah-Hartman } 2267ab4382d2SGreg Kroah-Hartman 2268ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 2269ab4382d2SGreg Kroah-Hartman 2270ab4382d2SGreg Kroah-Hartman static int uart_poll_init(struct tty_driver *driver, int line, char *options) 2271ab4382d2SGreg Kroah-Hartman { 2272ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2273ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2274ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2275ab4382d2SGreg Kroah-Hartman int baud = 9600; 2276ab4382d2SGreg Kroah-Hartman int bits = 8; 2277ab4382d2SGreg Kroah-Hartman int parity = 'n'; 2278ab4382d2SGreg Kroah-Hartman int flow = 'n'; 2279c7f3e708SAnton Vorontsov int ret; 2280ab4382d2SGreg Kroah-Hartman 2281ab4382d2SGreg Kroah-Hartman if (!state || !state->uart_port) 2282ab4382d2SGreg Kroah-Hartman return -1; 2283ab4382d2SGreg Kroah-Hartman 2284ab4382d2SGreg Kroah-Hartman port = state->uart_port; 2285ab4382d2SGreg Kroah-Hartman if (!(port->ops->poll_get_char && port->ops->poll_put_char)) 2286ab4382d2SGreg Kroah-Hartman return -1; 2287ab4382d2SGreg Kroah-Hartman 2288c7f3e708SAnton Vorontsov if (port->ops->poll_init) { 2289c7f3e708SAnton Vorontsov struct tty_port *tport = &state->port; 2290c7f3e708SAnton Vorontsov 2291c7f3e708SAnton Vorontsov ret = 0; 2292c7f3e708SAnton Vorontsov mutex_lock(&tport->mutex); 2293c7f3e708SAnton Vorontsov /* 2294c7f3e708SAnton Vorontsov * We don't set ASYNCB_INITIALIZED as we only initialized the 2295c7f3e708SAnton Vorontsov * hw, e.g. state->xmit is still uninitialized. 2296c7f3e708SAnton Vorontsov */ 2297c7f3e708SAnton Vorontsov if (!test_bit(ASYNCB_INITIALIZED, &tport->flags)) 2298c7f3e708SAnton Vorontsov ret = port->ops->poll_init(port); 2299c7f3e708SAnton Vorontsov mutex_unlock(&tport->mutex); 2300c7f3e708SAnton Vorontsov if (ret) 2301c7f3e708SAnton Vorontsov return ret; 2302c7f3e708SAnton Vorontsov } 2303c7f3e708SAnton Vorontsov 2304ab4382d2SGreg Kroah-Hartman if (options) { 2305ab4382d2SGreg Kroah-Hartman uart_parse_options(options, &baud, &parity, &bits, &flow); 2306ab4382d2SGreg Kroah-Hartman return uart_set_options(port, NULL, baud, parity, bits, flow); 2307ab4382d2SGreg Kroah-Hartman } 2308ab4382d2SGreg Kroah-Hartman 2309ab4382d2SGreg Kroah-Hartman return 0; 2310ab4382d2SGreg Kroah-Hartman } 2311ab4382d2SGreg Kroah-Hartman 2312ab4382d2SGreg Kroah-Hartman static int uart_poll_get_char(struct tty_driver *driver, int line) 2313ab4382d2SGreg Kroah-Hartman { 2314ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2315ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2316ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2317ab4382d2SGreg Kroah-Hartman 2318ab4382d2SGreg Kroah-Hartman if (!state || !state->uart_port) 2319ab4382d2SGreg Kroah-Hartman return -1; 2320ab4382d2SGreg Kroah-Hartman 2321ab4382d2SGreg Kroah-Hartman port = state->uart_port; 2322ab4382d2SGreg Kroah-Hartman return port->ops->poll_get_char(port); 2323ab4382d2SGreg Kroah-Hartman } 2324ab4382d2SGreg Kroah-Hartman 2325ab4382d2SGreg Kroah-Hartman static void uart_poll_put_char(struct tty_driver *driver, int line, char ch) 2326ab4382d2SGreg Kroah-Hartman { 2327ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2328ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2329ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2330ab4382d2SGreg Kroah-Hartman 2331ab4382d2SGreg Kroah-Hartman if (!state || !state->uart_port) 2332ab4382d2SGreg Kroah-Hartman return; 2333ab4382d2SGreg Kroah-Hartman 2334ab4382d2SGreg Kroah-Hartman port = state->uart_port; 2335c7d44a02SDoug Anderson 2336c7d44a02SDoug Anderson if (ch == '\n') 2337c7d44a02SDoug Anderson port->ops->poll_put_char(port, '\r'); 2338ab4382d2SGreg Kroah-Hartman port->ops->poll_put_char(port, ch); 2339ab4382d2SGreg Kroah-Hartman } 2340ab4382d2SGreg Kroah-Hartman #endif 2341ab4382d2SGreg Kroah-Hartman 2342ab4382d2SGreg Kroah-Hartman static const struct tty_operations uart_ops = { 2343ab4382d2SGreg Kroah-Hartman .open = uart_open, 2344ab4382d2SGreg Kroah-Hartman .close = uart_close, 2345ab4382d2SGreg Kroah-Hartman .write = uart_write, 2346ab4382d2SGreg Kroah-Hartman .put_char = uart_put_char, 2347ab4382d2SGreg Kroah-Hartman .flush_chars = uart_flush_chars, 2348ab4382d2SGreg Kroah-Hartman .write_room = uart_write_room, 2349ab4382d2SGreg Kroah-Hartman .chars_in_buffer= uart_chars_in_buffer, 2350ab4382d2SGreg Kroah-Hartman .flush_buffer = uart_flush_buffer, 2351ab4382d2SGreg Kroah-Hartman .ioctl = uart_ioctl, 2352ab4382d2SGreg Kroah-Hartman .throttle = uart_throttle, 2353ab4382d2SGreg Kroah-Hartman .unthrottle = uart_unthrottle, 2354ab4382d2SGreg Kroah-Hartman .send_xchar = uart_send_xchar, 2355ab4382d2SGreg Kroah-Hartman .set_termios = uart_set_termios, 2356ab4382d2SGreg Kroah-Hartman .set_ldisc = uart_set_ldisc, 2357ab4382d2SGreg Kroah-Hartman .stop = uart_stop, 2358ab4382d2SGreg Kroah-Hartman .start = uart_start, 2359ab4382d2SGreg Kroah-Hartman .hangup = uart_hangup, 2360ab4382d2SGreg Kroah-Hartman .break_ctl = uart_break_ctl, 2361ab4382d2SGreg Kroah-Hartman .wait_until_sent= uart_wait_until_sent, 2362ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_PROC_FS 2363ab4382d2SGreg Kroah-Hartman .proc_fops = &uart_proc_fops, 2364ab4382d2SGreg Kroah-Hartman #endif 2365ab4382d2SGreg Kroah-Hartman .tiocmget = uart_tiocmget, 2366ab4382d2SGreg Kroah-Hartman .tiocmset = uart_tiocmset, 2367ab4382d2SGreg Kroah-Hartman .get_icount = uart_get_icount, 2368ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 2369ab4382d2SGreg Kroah-Hartman .poll_init = uart_poll_init, 2370ab4382d2SGreg Kroah-Hartman .poll_get_char = uart_poll_get_char, 2371ab4382d2SGreg Kroah-Hartman .poll_put_char = uart_poll_put_char, 2372ab4382d2SGreg Kroah-Hartman #endif 2373ab4382d2SGreg Kroah-Hartman }; 2374ab4382d2SGreg Kroah-Hartman 2375ab4382d2SGreg Kroah-Hartman static const struct tty_port_operations uart_port_ops = { 2376ab4382d2SGreg Kroah-Hartman .carrier_raised = uart_carrier_raised, 2377ab4382d2SGreg Kroah-Hartman .dtr_rts = uart_dtr_rts, 2378ab4382d2SGreg Kroah-Hartman }; 2379ab4382d2SGreg Kroah-Hartman 2380ab4382d2SGreg Kroah-Hartman /** 2381ab4382d2SGreg Kroah-Hartman * uart_register_driver - register a driver with the uart core layer 2382ab4382d2SGreg Kroah-Hartman * @drv: low level driver structure 2383ab4382d2SGreg Kroah-Hartman * 2384ab4382d2SGreg Kroah-Hartman * Register a uart driver with the core driver. We in turn register 2385ab4382d2SGreg Kroah-Hartman * with the tty layer, and initialise the core driver per-port state. 2386ab4382d2SGreg Kroah-Hartman * 2387ab4382d2SGreg Kroah-Hartman * We have a proc file in /proc/tty/driver which is named after the 2388ab4382d2SGreg Kroah-Hartman * normal driver. 2389ab4382d2SGreg Kroah-Hartman * 2390ab4382d2SGreg Kroah-Hartman * drv->port should be NULL, and the per-port structures should be 2391ab4382d2SGreg Kroah-Hartman * registered using uart_add_one_port after this call has succeeded. 2392ab4382d2SGreg Kroah-Hartman */ 2393ab4382d2SGreg Kroah-Hartman int uart_register_driver(struct uart_driver *drv) 2394ab4382d2SGreg Kroah-Hartman { 2395ab4382d2SGreg Kroah-Hartman struct tty_driver *normal; 2396ab4382d2SGreg Kroah-Hartman int i, retval; 2397ab4382d2SGreg Kroah-Hartman 2398ab4382d2SGreg Kroah-Hartman BUG_ON(drv->state); 2399ab4382d2SGreg Kroah-Hartman 2400ab4382d2SGreg Kroah-Hartman /* 2401ab4382d2SGreg Kroah-Hartman * Maybe we should be using a slab cache for this, especially if 2402ab4382d2SGreg Kroah-Hartman * we have a large number of ports to handle. 2403ab4382d2SGreg Kroah-Hartman */ 2404ab4382d2SGreg Kroah-Hartman drv->state = kzalloc(sizeof(struct uart_state) * drv->nr, GFP_KERNEL); 2405ab4382d2SGreg Kroah-Hartman if (!drv->state) 2406ab4382d2SGreg Kroah-Hartman goto out; 2407ab4382d2SGreg Kroah-Hartman 2408ab4382d2SGreg Kroah-Hartman normal = alloc_tty_driver(drv->nr); 2409ab4382d2SGreg Kroah-Hartman if (!normal) 2410ab4382d2SGreg Kroah-Hartman goto out_kfree; 2411ab4382d2SGreg Kroah-Hartman 2412ab4382d2SGreg Kroah-Hartman drv->tty_driver = normal; 2413ab4382d2SGreg Kroah-Hartman 2414ab4382d2SGreg Kroah-Hartman normal->driver_name = drv->driver_name; 2415ab4382d2SGreg Kroah-Hartman normal->name = drv->dev_name; 2416ab4382d2SGreg Kroah-Hartman normal->major = drv->major; 2417ab4382d2SGreg Kroah-Hartman normal->minor_start = drv->minor; 2418ab4382d2SGreg Kroah-Hartman normal->type = TTY_DRIVER_TYPE_SERIAL; 2419ab4382d2SGreg Kroah-Hartman normal->subtype = SERIAL_TYPE_NORMAL; 2420ab4382d2SGreg Kroah-Hartman normal->init_termios = tty_std_termios; 2421ab4382d2SGreg Kroah-Hartman normal->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; 2422ab4382d2SGreg Kroah-Hartman normal->init_termios.c_ispeed = normal->init_termios.c_ospeed = 9600; 2423ab4382d2SGreg Kroah-Hartman normal->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; 2424ab4382d2SGreg Kroah-Hartman normal->driver_state = drv; 2425ab4382d2SGreg Kroah-Hartman tty_set_operations(normal, &uart_ops); 2426ab4382d2SGreg Kroah-Hartman 2427ab4382d2SGreg Kroah-Hartman /* 2428ab4382d2SGreg Kroah-Hartman * Initialise the UART state(s). 2429ab4382d2SGreg Kroah-Hartman */ 2430ab4382d2SGreg Kroah-Hartman for (i = 0; i < drv->nr; i++) { 2431ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + i; 2432ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2433ab4382d2SGreg Kroah-Hartman 2434ab4382d2SGreg Kroah-Hartman tty_port_init(port); 2435ab4382d2SGreg Kroah-Hartman port->ops = &uart_port_ops; 2436ab4382d2SGreg Kroah-Hartman } 2437ab4382d2SGreg Kroah-Hartman 2438ab4382d2SGreg Kroah-Hartman retval = tty_register_driver(normal); 2439ab4382d2SGreg Kroah-Hartman if (retval >= 0) 2440ab4382d2SGreg Kroah-Hartman return retval; 2441ab4382d2SGreg Kroah-Hartman 2442191c5f10SJiri Slaby for (i = 0; i < drv->nr; i++) 2443191c5f10SJiri Slaby tty_port_destroy(&drv->state[i].port); 2444ab4382d2SGreg Kroah-Hartman put_tty_driver(normal); 2445ab4382d2SGreg Kroah-Hartman out_kfree: 2446ab4382d2SGreg Kroah-Hartman kfree(drv->state); 2447ab4382d2SGreg Kroah-Hartman out: 2448ab4382d2SGreg Kroah-Hartman return -ENOMEM; 2449ab4382d2SGreg Kroah-Hartman } 2450ab4382d2SGreg Kroah-Hartman 2451ab4382d2SGreg Kroah-Hartman /** 2452ab4382d2SGreg Kroah-Hartman * uart_unregister_driver - remove a driver from the uart core layer 2453ab4382d2SGreg Kroah-Hartman * @drv: low level driver structure 2454ab4382d2SGreg Kroah-Hartman * 2455ab4382d2SGreg Kroah-Hartman * Remove all references to a driver from the core driver. The low 2456ab4382d2SGreg Kroah-Hartman * level driver must have removed all its ports via the 2457ab4382d2SGreg Kroah-Hartman * uart_remove_one_port() if it registered them with uart_add_one_port(). 2458ab4382d2SGreg Kroah-Hartman * (ie, drv->port == NULL) 2459ab4382d2SGreg Kroah-Hartman */ 2460ab4382d2SGreg Kroah-Hartman void uart_unregister_driver(struct uart_driver *drv) 2461ab4382d2SGreg Kroah-Hartman { 2462ab4382d2SGreg Kroah-Hartman struct tty_driver *p = drv->tty_driver; 2463191c5f10SJiri Slaby unsigned int i; 2464191c5f10SJiri Slaby 2465ab4382d2SGreg Kroah-Hartman tty_unregister_driver(p); 2466ab4382d2SGreg Kroah-Hartman put_tty_driver(p); 2467191c5f10SJiri Slaby for (i = 0; i < drv->nr; i++) 2468191c5f10SJiri Slaby tty_port_destroy(&drv->state[i].port); 2469ab4382d2SGreg Kroah-Hartman kfree(drv->state); 24701e66cdedSAlan Cox drv->state = NULL; 2471ab4382d2SGreg Kroah-Hartman drv->tty_driver = NULL; 2472ab4382d2SGreg Kroah-Hartman } 2473ab4382d2SGreg Kroah-Hartman 2474ab4382d2SGreg Kroah-Hartman struct tty_driver *uart_console_device(struct console *co, int *index) 2475ab4382d2SGreg Kroah-Hartman { 2476ab4382d2SGreg Kroah-Hartman struct uart_driver *p = co->data; 2477ab4382d2SGreg Kroah-Hartman *index = co->index; 2478ab4382d2SGreg Kroah-Hartman return p->tty_driver; 2479ab4382d2SGreg Kroah-Hartman } 2480ab4382d2SGreg Kroah-Hartman 24816915c0e4STomas Hlavacek static ssize_t uart_get_attr_uartclk(struct device *dev, 24826915c0e4STomas Hlavacek struct device_attribute *attr, char *buf) 24836915c0e4STomas Hlavacek { 2484bebe73e3SAlan Cox struct serial_struct tmp; 24856915c0e4STomas Hlavacek struct tty_port *port = dev_get_drvdata(dev); 2486b1b79916STomas Hlavacek 24879f109694SAlan Cox uart_get_info(port, &tmp); 2488bebe73e3SAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.baud_base * 16); 24896915c0e4STomas Hlavacek } 24906915c0e4STomas Hlavacek 2491373bac4cSAlan Cox static ssize_t uart_get_attr_type(struct device *dev, 2492373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2493373bac4cSAlan Cox { 2494373bac4cSAlan Cox struct serial_struct tmp; 2495373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2496373bac4cSAlan Cox 2497373bac4cSAlan Cox uart_get_info(port, &tmp); 2498373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.type); 2499373bac4cSAlan Cox } 2500373bac4cSAlan Cox static ssize_t uart_get_attr_line(struct device *dev, 2501373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2502373bac4cSAlan Cox { 2503373bac4cSAlan Cox struct serial_struct tmp; 2504373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2505373bac4cSAlan Cox 2506373bac4cSAlan Cox uart_get_info(port, &tmp); 2507373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.line); 2508373bac4cSAlan Cox } 2509373bac4cSAlan Cox 2510373bac4cSAlan Cox static ssize_t uart_get_attr_port(struct device *dev, 2511373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2512373bac4cSAlan Cox { 2513373bac4cSAlan Cox struct serial_struct tmp; 2514373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2515fd985e1dSAndrew Morton unsigned long ioaddr; 2516373bac4cSAlan Cox 2517373bac4cSAlan Cox uart_get_info(port, &tmp); 2518fd985e1dSAndrew Morton ioaddr = tmp.port; 2519fd985e1dSAndrew Morton if (HIGH_BITS_OFFSET) 2520fd985e1dSAndrew Morton ioaddr |= (unsigned long)tmp.port_high << HIGH_BITS_OFFSET; 2521fd985e1dSAndrew Morton return snprintf(buf, PAGE_SIZE, "0x%lX\n", ioaddr); 2522373bac4cSAlan Cox } 2523373bac4cSAlan Cox 2524373bac4cSAlan Cox static ssize_t uart_get_attr_irq(struct device *dev, 2525373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2526373bac4cSAlan Cox { 2527373bac4cSAlan Cox struct serial_struct tmp; 2528373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2529373bac4cSAlan Cox 2530373bac4cSAlan Cox uart_get_info(port, &tmp); 2531373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.irq); 2532373bac4cSAlan Cox } 2533373bac4cSAlan Cox 2534373bac4cSAlan Cox static ssize_t uart_get_attr_flags(struct device *dev, 2535373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2536373bac4cSAlan Cox { 2537373bac4cSAlan Cox struct serial_struct tmp; 2538373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2539373bac4cSAlan Cox 2540373bac4cSAlan Cox uart_get_info(port, &tmp); 2541373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "0x%X\n", tmp.flags); 2542373bac4cSAlan Cox } 2543373bac4cSAlan Cox 2544373bac4cSAlan Cox static ssize_t uart_get_attr_xmit_fifo_size(struct device *dev, 2545373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2546373bac4cSAlan Cox { 2547373bac4cSAlan Cox struct serial_struct tmp; 2548373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2549373bac4cSAlan Cox 2550373bac4cSAlan Cox uart_get_info(port, &tmp); 2551373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.xmit_fifo_size); 2552373bac4cSAlan Cox } 2553373bac4cSAlan Cox 2554373bac4cSAlan Cox 2555373bac4cSAlan Cox static ssize_t uart_get_attr_close_delay(struct device *dev, 2556373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2557373bac4cSAlan Cox { 2558373bac4cSAlan Cox struct serial_struct tmp; 2559373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2560373bac4cSAlan Cox 2561373bac4cSAlan Cox uart_get_info(port, &tmp); 2562373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.close_delay); 2563373bac4cSAlan Cox } 2564373bac4cSAlan Cox 2565373bac4cSAlan Cox 2566373bac4cSAlan Cox static ssize_t uart_get_attr_closing_wait(struct device *dev, 2567373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2568373bac4cSAlan Cox { 2569373bac4cSAlan Cox struct serial_struct tmp; 2570373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2571373bac4cSAlan Cox 2572373bac4cSAlan Cox uart_get_info(port, &tmp); 2573373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.closing_wait); 2574373bac4cSAlan Cox } 2575373bac4cSAlan Cox 2576373bac4cSAlan Cox static ssize_t uart_get_attr_custom_divisor(struct device *dev, 2577373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2578373bac4cSAlan Cox { 2579373bac4cSAlan Cox struct serial_struct tmp; 2580373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2581373bac4cSAlan Cox 2582373bac4cSAlan Cox uart_get_info(port, &tmp); 2583373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.custom_divisor); 2584373bac4cSAlan Cox } 2585373bac4cSAlan Cox 2586373bac4cSAlan Cox static ssize_t uart_get_attr_io_type(struct device *dev, 2587373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2588373bac4cSAlan Cox { 2589373bac4cSAlan Cox struct serial_struct tmp; 2590373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2591373bac4cSAlan Cox 2592373bac4cSAlan Cox uart_get_info(port, &tmp); 2593373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.io_type); 2594373bac4cSAlan Cox } 2595373bac4cSAlan Cox 2596373bac4cSAlan Cox static ssize_t uart_get_attr_iomem_base(struct device *dev, 2597373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2598373bac4cSAlan Cox { 2599373bac4cSAlan Cox struct serial_struct tmp; 2600373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2601373bac4cSAlan Cox 2602373bac4cSAlan Cox uart_get_info(port, &tmp); 2603373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "0x%lX\n", (unsigned long)tmp.iomem_base); 2604373bac4cSAlan Cox } 2605373bac4cSAlan Cox 2606373bac4cSAlan Cox static ssize_t uart_get_attr_iomem_reg_shift(struct device *dev, 2607373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2608373bac4cSAlan Cox { 2609373bac4cSAlan Cox struct serial_struct tmp; 2610373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2611373bac4cSAlan Cox 2612373bac4cSAlan Cox uart_get_info(port, &tmp); 2613373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.iomem_reg_shift); 2614373bac4cSAlan Cox } 2615373bac4cSAlan Cox 2616373bac4cSAlan Cox static DEVICE_ATTR(type, S_IRUSR | S_IRGRP, uart_get_attr_type, NULL); 2617373bac4cSAlan Cox static DEVICE_ATTR(line, S_IRUSR | S_IRGRP, uart_get_attr_line, NULL); 2618373bac4cSAlan Cox static DEVICE_ATTR(port, S_IRUSR | S_IRGRP, uart_get_attr_port, NULL); 2619373bac4cSAlan Cox static DEVICE_ATTR(irq, S_IRUSR | S_IRGRP, uart_get_attr_irq, NULL); 2620373bac4cSAlan Cox static DEVICE_ATTR(flags, S_IRUSR | S_IRGRP, uart_get_attr_flags, NULL); 2621373bac4cSAlan Cox static DEVICE_ATTR(xmit_fifo_size, S_IRUSR | S_IRGRP, uart_get_attr_xmit_fifo_size, NULL); 26226915c0e4STomas Hlavacek static DEVICE_ATTR(uartclk, S_IRUSR | S_IRGRP, uart_get_attr_uartclk, NULL); 2623373bac4cSAlan Cox static DEVICE_ATTR(close_delay, S_IRUSR | S_IRGRP, uart_get_attr_close_delay, NULL); 2624373bac4cSAlan Cox static DEVICE_ATTR(closing_wait, S_IRUSR | S_IRGRP, uart_get_attr_closing_wait, NULL); 2625373bac4cSAlan Cox static DEVICE_ATTR(custom_divisor, S_IRUSR | S_IRGRP, uart_get_attr_custom_divisor, NULL); 2626373bac4cSAlan Cox static DEVICE_ATTR(io_type, S_IRUSR | S_IRGRP, uart_get_attr_io_type, NULL); 2627373bac4cSAlan Cox static DEVICE_ATTR(iomem_base, S_IRUSR | S_IRGRP, uart_get_attr_iomem_base, NULL); 2628373bac4cSAlan Cox static DEVICE_ATTR(iomem_reg_shift, S_IRUSR | S_IRGRP, uart_get_attr_iomem_reg_shift, NULL); 26296915c0e4STomas Hlavacek 26306915c0e4STomas Hlavacek static struct attribute *tty_dev_attrs[] = { 2631373bac4cSAlan Cox &dev_attr_type.attr, 2632373bac4cSAlan Cox &dev_attr_line.attr, 2633373bac4cSAlan Cox &dev_attr_port.attr, 2634373bac4cSAlan Cox &dev_attr_irq.attr, 2635373bac4cSAlan Cox &dev_attr_flags.attr, 2636373bac4cSAlan Cox &dev_attr_xmit_fifo_size.attr, 26376915c0e4STomas Hlavacek &dev_attr_uartclk.attr, 2638373bac4cSAlan Cox &dev_attr_close_delay.attr, 2639373bac4cSAlan Cox &dev_attr_closing_wait.attr, 2640373bac4cSAlan Cox &dev_attr_custom_divisor.attr, 2641373bac4cSAlan Cox &dev_attr_io_type.attr, 2642373bac4cSAlan Cox &dev_attr_iomem_base.attr, 2643373bac4cSAlan Cox &dev_attr_iomem_reg_shift.attr, 26446915c0e4STomas Hlavacek NULL, 26456915c0e4STomas Hlavacek }; 26466915c0e4STomas Hlavacek 2647b1b79916STomas Hlavacek static const struct attribute_group tty_dev_attr_group = { 26486915c0e4STomas Hlavacek .attrs = tty_dev_attrs, 26496915c0e4STomas Hlavacek }; 26506915c0e4STomas Hlavacek 2651ab4382d2SGreg Kroah-Hartman /** 2652ab4382d2SGreg Kroah-Hartman * uart_add_one_port - attach a driver-defined port structure 2653ab4382d2SGreg Kroah-Hartman * @drv: pointer to the uart low level driver structure for this port 2654ab4382d2SGreg Kroah-Hartman * @uport: uart port structure to use for this port. 2655ab4382d2SGreg Kroah-Hartman * 2656ab4382d2SGreg Kroah-Hartman * This allows the driver to register its own uart_port structure 2657ab4382d2SGreg Kroah-Hartman * with the core driver. The main purpose is to allow the low 2658ab4382d2SGreg Kroah-Hartman * level uart drivers to expand uart_port, rather than having yet 2659ab4382d2SGreg Kroah-Hartman * more levels of structures. 2660ab4382d2SGreg Kroah-Hartman */ 2661ab4382d2SGreg Kroah-Hartman int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport) 2662ab4382d2SGreg Kroah-Hartman { 2663ab4382d2SGreg Kroah-Hartman struct uart_state *state; 2664ab4382d2SGreg Kroah-Hartman struct tty_port *port; 2665ab4382d2SGreg Kroah-Hartman int ret = 0; 2666ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 2667266dcff0SGreg Kroah-Hartman int num_groups; 2668ab4382d2SGreg Kroah-Hartman 2669ab4382d2SGreg Kroah-Hartman BUG_ON(in_interrupt()); 2670ab4382d2SGreg Kroah-Hartman 2671ab4382d2SGreg Kroah-Hartman if (uport->line >= drv->nr) 2672ab4382d2SGreg Kroah-Hartman return -EINVAL; 2673ab4382d2SGreg Kroah-Hartman 2674ab4382d2SGreg Kroah-Hartman state = drv->state + uport->line; 2675ab4382d2SGreg Kroah-Hartman port = &state->port; 2676ab4382d2SGreg Kroah-Hartman 2677ab4382d2SGreg Kroah-Hartman mutex_lock(&port_mutex); 2678ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2679ab4382d2SGreg Kroah-Hartman if (state->uart_port) { 2680ab4382d2SGreg Kroah-Hartman ret = -EINVAL; 2681ab4382d2SGreg Kroah-Hartman goto out; 2682ab4382d2SGreg Kroah-Hartman } 2683ab4382d2SGreg Kroah-Hartman 26842b702b9bSPeter Hurley /* Link the port to the driver state table and vice versa */ 2685ab4382d2SGreg Kroah-Hartman state->uart_port = uport; 2686ab4382d2SGreg Kroah-Hartman uport->state = state; 2687ab4382d2SGreg Kroah-Hartman 26882b702b9bSPeter Hurley state->pm_state = UART_PM_STATE_UNDEFINED; 26892b702b9bSPeter Hurley uport->cons = drv->cons; 2690959801feSPeter Hurley uport->minor = drv->tty_driver->minor_start + uport->line; 26912b702b9bSPeter Hurley 2692ab4382d2SGreg Kroah-Hartman /* 2693ab4382d2SGreg Kroah-Hartman * If this port is a console, then the spinlock is already 2694ab4382d2SGreg Kroah-Hartman * initialised. 2695ab4382d2SGreg Kroah-Hartman */ 2696ab4382d2SGreg Kroah-Hartman if (!(uart_console(uport) && (uport->cons->flags & CON_ENABLED))) { 2697ab4382d2SGreg Kroah-Hartman spin_lock_init(&uport->lock); 2698ab4382d2SGreg Kroah-Hartman lockdep_set_class(&uport->lock, &port_lock_key); 2699ab4382d2SGreg Kroah-Hartman } 2700a208ffd2SGrant Likely if (uport->cons && uport->dev) 2701a208ffd2SGrant Likely of_console_check(uport->dev->of_node, uport->cons->name, uport->line); 2702ab4382d2SGreg Kroah-Hartman 2703ab4382d2SGreg Kroah-Hartman uart_configure_port(drv, state, uport); 2704ab4382d2SGreg Kroah-Hartman 2705266dcff0SGreg Kroah-Hartman num_groups = 2; 2706266dcff0SGreg Kroah-Hartman if (uport->attr_group) 2707266dcff0SGreg Kroah-Hartman num_groups++; 2708266dcff0SGreg Kroah-Hartman 2709c2b703b8SYoshihiro YUNOMAE uport->tty_groups = kcalloc(num_groups, sizeof(*uport->tty_groups), 2710266dcff0SGreg Kroah-Hartman GFP_KERNEL); 2711266dcff0SGreg Kroah-Hartman if (!uport->tty_groups) { 2712266dcff0SGreg Kroah-Hartman ret = -ENOMEM; 2713266dcff0SGreg Kroah-Hartman goto out; 2714266dcff0SGreg Kroah-Hartman } 2715266dcff0SGreg Kroah-Hartman uport->tty_groups[0] = &tty_dev_attr_group; 2716266dcff0SGreg Kroah-Hartman if (uport->attr_group) 2717266dcff0SGreg Kroah-Hartman uport->tty_groups[1] = uport->attr_group; 2718266dcff0SGreg Kroah-Hartman 2719ab4382d2SGreg Kroah-Hartman /* 2720ab4382d2SGreg Kroah-Hartman * Register the port whether it's detected or not. This allows 2721015355b7SGeert Uytterhoeven * setserial to be used to alter this port's parameters. 2722ab4382d2SGreg Kroah-Hartman */ 2723b1b79916STomas Hlavacek tty_dev = tty_port_register_device_attr(port, drv->tty_driver, 2724266dcff0SGreg Kroah-Hartman uport->line, uport->dev, port, uport->tty_groups); 2725ab4382d2SGreg Kroah-Hartman if (likely(!IS_ERR(tty_dev))) { 272677359835SSimon Glass device_set_wakeup_capable(tty_dev, 1); 272777359835SSimon Glass } else { 27282f2dafe7SSudip Mukherjee dev_err(uport->dev, "Cannot register tty device on line %d\n", 2729ab4382d2SGreg Kroah-Hartman uport->line); 273077359835SSimon Glass } 2731ab4382d2SGreg Kroah-Hartman 2732ab4382d2SGreg Kroah-Hartman /* 2733ab4382d2SGreg Kroah-Hartman * Ensure UPF_DEAD is not set. 2734ab4382d2SGreg Kroah-Hartman */ 2735ab4382d2SGreg Kroah-Hartman uport->flags &= ~UPF_DEAD; 2736ab4382d2SGreg Kroah-Hartman 2737ab4382d2SGreg Kroah-Hartman out: 2738ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2739ab4382d2SGreg Kroah-Hartman mutex_unlock(&port_mutex); 2740ab4382d2SGreg Kroah-Hartman 2741ab4382d2SGreg Kroah-Hartman return ret; 2742ab4382d2SGreg Kroah-Hartman } 2743ab4382d2SGreg Kroah-Hartman 2744ab4382d2SGreg Kroah-Hartman /** 2745ab4382d2SGreg Kroah-Hartman * uart_remove_one_port - detach a driver defined port structure 2746ab4382d2SGreg Kroah-Hartman * @drv: pointer to the uart low level driver structure for this port 2747ab4382d2SGreg Kroah-Hartman * @uport: uart port structure for this port 2748ab4382d2SGreg Kroah-Hartman * 2749ab4382d2SGreg Kroah-Hartman * This unhooks (and hangs up) the specified port structure from the 2750ab4382d2SGreg Kroah-Hartman * core driver. No further calls will be made to the low-level code 2751ab4382d2SGreg Kroah-Hartman * for this port. 2752ab4382d2SGreg Kroah-Hartman */ 2753ab4382d2SGreg Kroah-Hartman int uart_remove_one_port(struct uart_driver *drv, struct uart_port *uport) 2754ab4382d2SGreg Kroah-Hartman { 2755ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 2756ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 27574c6d5b4dSGeert Uytterhoeven struct tty_struct *tty; 2758b342dd51SChen Gang int ret = 0; 2759ab4382d2SGreg Kroah-Hartman 2760ab4382d2SGreg Kroah-Hartman BUG_ON(in_interrupt()); 2761ab4382d2SGreg Kroah-Hartman 2762ab4382d2SGreg Kroah-Hartman if (state->uart_port != uport) 27632f2dafe7SSudip Mukherjee dev_alert(uport->dev, "Removing wrong port: %p != %p\n", 2764ab4382d2SGreg Kroah-Hartman state->uart_port, uport); 2765ab4382d2SGreg Kroah-Hartman 2766ab4382d2SGreg Kroah-Hartman mutex_lock(&port_mutex); 2767ab4382d2SGreg Kroah-Hartman 2768ab4382d2SGreg Kroah-Hartman /* 2769ab4382d2SGreg Kroah-Hartman * Mark the port "dead" - this prevents any opens from 2770ab4382d2SGreg Kroah-Hartman * succeeding while we shut down the port. 2771ab4382d2SGreg Kroah-Hartman */ 2772ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2773b342dd51SChen Gang if (!state->uart_port) { 2774b342dd51SChen Gang mutex_unlock(&port->mutex); 2775b342dd51SChen Gang ret = -EINVAL; 2776b342dd51SChen Gang goto out; 2777b342dd51SChen Gang } 2778ab4382d2SGreg Kroah-Hartman uport->flags |= UPF_DEAD; 2779ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2780ab4382d2SGreg Kroah-Hartman 2781ab4382d2SGreg Kroah-Hartman /* 2782ab4382d2SGreg Kroah-Hartman * Remove the devices from the tty layer 2783ab4382d2SGreg Kroah-Hartman */ 2784ab4382d2SGreg Kroah-Hartman tty_unregister_device(drv->tty_driver, uport->line); 2785ab4382d2SGreg Kroah-Hartman 27864c6d5b4dSGeert Uytterhoeven tty = tty_port_tty_get(port); 27874c6d5b4dSGeert Uytterhoeven if (tty) { 2788ab4382d2SGreg Kroah-Hartman tty_vhangup(port->tty); 27894c6d5b4dSGeert Uytterhoeven tty_kref_put(tty); 27904c6d5b4dSGeert Uytterhoeven } 2791ab4382d2SGreg Kroah-Hartman 2792ab4382d2SGreg Kroah-Hartman /* 27935f5c9ae5SGeert Uytterhoeven * If the port is used as a console, unregister it 27945f5c9ae5SGeert Uytterhoeven */ 27955f5c9ae5SGeert Uytterhoeven if (uart_console(uport)) 27965f5c9ae5SGeert Uytterhoeven unregister_console(uport->cons); 27975f5c9ae5SGeert Uytterhoeven 27985f5c9ae5SGeert Uytterhoeven /* 2799ab4382d2SGreg Kroah-Hartman * Free the port IO and memory resources, if any. 2800ab4382d2SGreg Kroah-Hartman */ 2801ab4382d2SGreg Kroah-Hartman if (uport->type != PORT_UNKNOWN) 2802ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 2803266dcff0SGreg Kroah-Hartman kfree(uport->tty_groups); 2804ab4382d2SGreg Kroah-Hartman 2805ab4382d2SGreg Kroah-Hartman /* 2806ab4382d2SGreg Kroah-Hartman * Indicate that there isn't a port here anymore. 2807ab4382d2SGreg Kroah-Hartman */ 2808ab4382d2SGreg Kroah-Hartman uport->type = PORT_UNKNOWN; 2809ab4382d2SGreg Kroah-Hartman 2810ab4382d2SGreg Kroah-Hartman state->uart_port = NULL; 2811b342dd51SChen Gang out: 2812ab4382d2SGreg Kroah-Hartman mutex_unlock(&port_mutex); 2813ab4382d2SGreg Kroah-Hartman 2814b342dd51SChen Gang return ret; 2815ab4382d2SGreg Kroah-Hartman } 2816ab4382d2SGreg Kroah-Hartman 2817ab4382d2SGreg Kroah-Hartman /* 2818ab4382d2SGreg Kroah-Hartman * Are the two ports equivalent? 2819ab4382d2SGreg Kroah-Hartman */ 2820ab4382d2SGreg Kroah-Hartman int uart_match_port(struct uart_port *port1, struct uart_port *port2) 2821ab4382d2SGreg Kroah-Hartman { 2822ab4382d2SGreg Kroah-Hartman if (port1->iotype != port2->iotype) 2823ab4382d2SGreg Kroah-Hartman return 0; 2824ab4382d2SGreg Kroah-Hartman 2825ab4382d2SGreg Kroah-Hartman switch (port1->iotype) { 2826ab4382d2SGreg Kroah-Hartman case UPIO_PORT: 2827ab4382d2SGreg Kroah-Hartman return (port1->iobase == port2->iobase); 2828ab4382d2SGreg Kroah-Hartman case UPIO_HUB6: 2829ab4382d2SGreg Kroah-Hartman return (port1->iobase == port2->iobase) && 2830ab4382d2SGreg Kroah-Hartman (port1->hub6 == port2->hub6); 2831ab4382d2SGreg Kroah-Hartman case UPIO_MEM: 2832bd94c407SMasahiro Yamada case UPIO_MEM16: 2833ab4382d2SGreg Kroah-Hartman case UPIO_MEM32: 28343ffb1a81SKevin Cernekee case UPIO_MEM32BE: 2835ab4382d2SGreg Kroah-Hartman case UPIO_AU: 2836ab4382d2SGreg Kroah-Hartman case UPIO_TSI: 2837ab4382d2SGreg Kroah-Hartman return (port1->mapbase == port2->mapbase); 2838ab4382d2SGreg Kroah-Hartman } 2839ab4382d2SGreg Kroah-Hartman return 0; 2840ab4382d2SGreg Kroah-Hartman } 2841ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_match_port); 2842ab4382d2SGreg Kroah-Hartman 2843027d7dacSJiri Slaby /** 2844027d7dacSJiri Slaby * uart_handle_dcd_change - handle a change of carrier detect state 2845027d7dacSJiri Slaby * @uport: uart_port structure for the open port 2846027d7dacSJiri Slaby * @status: new carrier detect status, nonzero if active 28474d90bb14SPeter Hurley * 28484d90bb14SPeter Hurley * Caller must hold uport->lock 2849027d7dacSJiri Slaby */ 2850027d7dacSJiri Slaby void uart_handle_dcd_change(struct uart_port *uport, unsigned int status) 2851027d7dacSJiri Slaby { 285242381572SGeorge Spelvin struct tty_port *port = &uport->state->port; 285343eca0aeSAlan Cox struct tty_struct *tty = port->tty; 2854c993257bSPeter Hurley struct tty_ldisc *ld; 2855027d7dacSJiri Slaby 28564d90bb14SPeter Hurley lockdep_assert_held_once(&uport->lock); 28574d90bb14SPeter Hurley 2858c993257bSPeter Hurley if (tty) { 2859c993257bSPeter Hurley ld = tty_ldisc_ref(tty); 286042381572SGeorge Spelvin if (ld) { 286142381572SGeorge Spelvin if (ld->ops->dcd_change) 2862593fb1aeSGeorge Spelvin ld->ops->dcd_change(tty, status); 286342381572SGeorge Spelvin tty_ldisc_deref(ld); 286442381572SGeorge Spelvin } 2865c993257bSPeter Hurley } 2866027d7dacSJiri Slaby 2867027d7dacSJiri Slaby uport->icount.dcd++; 2868027d7dacSJiri Slaby 2869299245a1SPeter Hurley if (uart_dcd_enabled(uport)) { 2870027d7dacSJiri Slaby if (status) 2871027d7dacSJiri Slaby wake_up_interruptible(&port->open_wait); 287243eca0aeSAlan Cox else if (tty) 287343eca0aeSAlan Cox tty_hangup(tty); 2874027d7dacSJiri Slaby } 2875027d7dacSJiri Slaby } 2876027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_handle_dcd_change); 2877027d7dacSJiri Slaby 2878027d7dacSJiri Slaby /** 2879027d7dacSJiri Slaby * uart_handle_cts_change - handle a change of clear-to-send state 2880027d7dacSJiri Slaby * @uport: uart_port structure for the open port 2881027d7dacSJiri Slaby * @status: new clear to send status, nonzero if active 28824d90bb14SPeter Hurley * 28834d90bb14SPeter Hurley * Caller must hold uport->lock 2884027d7dacSJiri Slaby */ 2885027d7dacSJiri Slaby void uart_handle_cts_change(struct uart_port *uport, unsigned int status) 2886027d7dacSJiri Slaby { 28874d90bb14SPeter Hurley lockdep_assert_held_once(&uport->lock); 28884d90bb14SPeter Hurley 2889027d7dacSJiri Slaby uport->icount.cts++; 2890027d7dacSJiri Slaby 2891391f93f2SPeter Hurley if (uart_softcts_mode(uport)) { 2892d01f4d18SPeter Hurley if (uport->hw_stopped) { 2893027d7dacSJiri Slaby if (status) { 2894d01f4d18SPeter Hurley uport->hw_stopped = 0; 2895027d7dacSJiri Slaby uport->ops->start_tx(uport); 2896027d7dacSJiri Slaby uart_write_wakeup(uport); 2897027d7dacSJiri Slaby } 2898027d7dacSJiri Slaby } else { 2899027d7dacSJiri Slaby if (!status) { 2900d01f4d18SPeter Hurley uport->hw_stopped = 1; 2901027d7dacSJiri Slaby uport->ops->stop_tx(uport); 2902027d7dacSJiri Slaby } 2903027d7dacSJiri Slaby } 2904391f93f2SPeter Hurley 2905027d7dacSJiri Slaby } 2906027d7dacSJiri Slaby } 2907027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_handle_cts_change); 2908027d7dacSJiri Slaby 2909cf75525fSJiri Slaby /** 2910cf75525fSJiri Slaby * uart_insert_char - push a char to the uart layer 2911cf75525fSJiri Slaby * 2912cf75525fSJiri Slaby * User is responsible to call tty_flip_buffer_push when they are done with 2913cf75525fSJiri Slaby * insertion. 2914cf75525fSJiri Slaby * 2915cf75525fSJiri Slaby * @port: corresponding port 2916cf75525fSJiri Slaby * @status: state of the serial port RX buffer (LSR for 8250) 2917cf75525fSJiri Slaby * @overrun: mask of overrun bits in @status 2918cf75525fSJiri Slaby * @ch: character to push 2919cf75525fSJiri Slaby * @flag: flag for the character (see TTY_NORMAL and friends) 2920cf75525fSJiri Slaby */ 2921027d7dacSJiri Slaby void uart_insert_char(struct uart_port *port, unsigned int status, 2922027d7dacSJiri Slaby unsigned int overrun, unsigned int ch, unsigned int flag) 2923027d7dacSJiri Slaby { 292492a19f9cSJiri Slaby struct tty_port *tport = &port->state->port; 2925027d7dacSJiri Slaby 2926027d7dacSJiri Slaby if ((status & port->ignore_status_mask & ~overrun) == 0) 292792a19f9cSJiri Slaby if (tty_insert_flip_char(tport, ch, flag) == 0) 2928dabfb351SCorbin ++port->icount.buf_overrun; 2929027d7dacSJiri Slaby 2930027d7dacSJiri Slaby /* 2931027d7dacSJiri Slaby * Overrun is special. Since it's reported immediately, 2932027d7dacSJiri Slaby * it doesn't affect the current character. 2933027d7dacSJiri Slaby */ 2934027d7dacSJiri Slaby if (status & ~port->ignore_status_mask & overrun) 293592a19f9cSJiri Slaby if (tty_insert_flip_char(tport, 0, TTY_OVERRUN) == 0) 2936dabfb351SCorbin ++port->icount.buf_overrun; 2937027d7dacSJiri Slaby } 2938027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_insert_char); 2939027d7dacSJiri Slaby 2940ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_write_wakeup); 2941ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_register_driver); 2942ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_unregister_driver); 2943ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_suspend_port); 2944ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_resume_port); 2945ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_add_one_port); 2946ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_remove_one_port); 2947ab4382d2SGreg Kroah-Hartman 2948ab4382d2SGreg Kroah-Hartman MODULE_DESCRIPTION("Serial driver core"); 2949ab4382d2SGreg Kroah-Hartman MODULE_LICENSE("GPL"); 2950