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 113ab4382d2SGreg Kroah-Hartman static inline void 114ab4382d2SGreg Kroah-Hartman uart_update_mctrl(struct uart_port *port, unsigned int set, unsigned int clear) 115ab4382d2SGreg Kroah-Hartman { 116ab4382d2SGreg Kroah-Hartman unsigned long flags; 117ab4382d2SGreg Kroah-Hartman unsigned int old; 118ab4382d2SGreg Kroah-Hartman 119ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 120ab4382d2SGreg Kroah-Hartman old = port->mctrl; 121ab4382d2SGreg Kroah-Hartman port->mctrl = (old & ~clear) | set; 122ab4382d2SGreg Kroah-Hartman if (old != port->mctrl) 123ab4382d2SGreg Kroah-Hartman port->ops->set_mctrl(port, port->mctrl); 124ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 125ab4382d2SGreg Kroah-Hartman } 126ab4382d2SGreg Kroah-Hartman 127ab4382d2SGreg Kroah-Hartman #define uart_set_mctrl(port, set) uart_update_mctrl(port, set, 0) 128ab4382d2SGreg Kroah-Hartman #define uart_clear_mctrl(port, clear) uart_update_mctrl(port, 0, clear) 129ab4382d2SGreg Kroah-Hartman 130ab4382d2SGreg Kroah-Hartman /* 131ab4382d2SGreg Kroah-Hartman * Startup the port. This will be called once per open. All calls 132ab4382d2SGreg Kroah-Hartman * will be serialised by the per-port mutex. 133ab4382d2SGreg Kroah-Hartman */ 134c0d92be6SJiri Slaby static int uart_port_startup(struct tty_struct *tty, struct uart_state *state, 135c0d92be6SJiri Slaby int init_hw) 136ab4382d2SGreg Kroah-Hartman { 137ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 138ab4382d2SGreg Kroah-Hartman 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 174c7d7abffSJiri Slaby if (init_hw) { 175ab4382d2SGreg Kroah-Hartman /* 176ab4382d2SGreg Kroah-Hartman * Setup the RTS and DTR signals once the 177ab4382d2SGreg Kroah-Hartman * port is open and ready to respond. 178ab4382d2SGreg Kroah-Hartman */ 179adc8d746SAlan Cox if (tty->termios.c_cflag & CBAUD) 180ab4382d2SGreg Kroah-Hartman uart_set_mctrl(uport, TIOCM_RTS | TIOCM_DTR); 181ab4382d2SGreg Kroah-Hartman } 182a6eec92eSPeter Hurley 183ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 184d01f4d18SPeter Hurley if (uart_cts_enabled(uport) && 185d01f4d18SPeter Hurley !(uport->ops->get_mctrl(uport) & TIOCM_CTS)) 186d01f4d18SPeter Hurley uport->hw_stopped = 1; 187d01f4d18SPeter Hurley else 188d01f4d18SPeter Hurley uport->hw_stopped = 0; 189299245a1SPeter Hurley spin_unlock_irq(&uport->lock); 190ab4382d2SGreg Kroah-Hartman } 191ab4382d2SGreg Kroah-Hartman 1920055197eSJiri Slaby /* 1930055197eSJiri Slaby * This is to allow setserial on this port. People may want to set 1940055197eSJiri Slaby * port/irq/type and then reconfigure the port properly if it failed 1950055197eSJiri Slaby * now. 1960055197eSJiri Slaby */ 197ab4382d2SGreg Kroah-Hartman if (retval && capable(CAP_SYS_ADMIN)) 198c0d92be6SJiri Slaby return 1; 199c0d92be6SJiri Slaby 200c0d92be6SJiri Slaby return retval; 201c0d92be6SJiri Slaby } 202c0d92be6SJiri Slaby 203c0d92be6SJiri Slaby static int uart_startup(struct tty_struct *tty, struct uart_state *state, 204c0d92be6SJiri Slaby int init_hw) 205c0d92be6SJiri Slaby { 206c0d92be6SJiri Slaby struct tty_port *port = &state->port; 207c0d92be6SJiri Slaby int retval; 208c0d92be6SJiri Slaby 209c0d92be6SJiri Slaby if (port->flags & ASYNC_INITIALIZED) 210c0d92be6SJiri Slaby return 0; 211c0d92be6SJiri Slaby 212c0d92be6SJiri Slaby /* 213c0d92be6SJiri Slaby * Set the TTY IO error marker - we will only clear this 214c0d92be6SJiri Slaby * once we have successfully opened the port. 215c0d92be6SJiri Slaby */ 216c0d92be6SJiri Slaby set_bit(TTY_IO_ERROR, &tty->flags); 217c0d92be6SJiri Slaby 218c0d92be6SJiri Slaby retval = uart_port_startup(tty, state, init_hw); 219c0d92be6SJiri Slaby if (!retval) { 220c0d92be6SJiri Slaby set_bit(ASYNCB_INITIALIZED, &port->flags); 221c0d92be6SJiri Slaby clear_bit(TTY_IO_ERROR, &tty->flags); 222c0d92be6SJiri Slaby } else if (retval > 0) 223ab4382d2SGreg Kroah-Hartman retval = 0; 224ab4382d2SGreg Kroah-Hartman 225ab4382d2SGreg Kroah-Hartman return retval; 226ab4382d2SGreg Kroah-Hartman } 227ab4382d2SGreg Kroah-Hartman 228ab4382d2SGreg Kroah-Hartman /* 229ab4382d2SGreg Kroah-Hartman * This routine will shutdown a serial port; interrupts are disabled, and 230ab4382d2SGreg Kroah-Hartman * DTR is dropped if the hangup on close termio flag is on. Calls to 231ab4382d2SGreg Kroah-Hartman * uart_shutdown are serialised by the per-port semaphore. 232ab4382d2SGreg Kroah-Hartman */ 233ab4382d2SGreg Kroah-Hartman static void uart_shutdown(struct tty_struct *tty, struct uart_state *state) 234ab4382d2SGreg Kroah-Hartman { 235ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 236ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 237ab4382d2SGreg Kroah-Hartman 238ab4382d2SGreg Kroah-Hartman /* 239ab4382d2SGreg Kroah-Hartman * Set the TTY IO error marker 240ab4382d2SGreg Kroah-Hartman */ 241ab4382d2SGreg Kroah-Hartman if (tty) 242ab4382d2SGreg Kroah-Hartman set_bit(TTY_IO_ERROR, &tty->flags); 243ab4382d2SGreg Kroah-Hartman 244ab4382d2SGreg Kroah-Hartman if (test_and_clear_bit(ASYNCB_INITIALIZED, &port->flags)) { 245ab4382d2SGreg Kroah-Hartman /* 246ab4382d2SGreg Kroah-Hartman * Turn off DTR and RTS early. 247ab4382d2SGreg Kroah-Hartman */ 248ae84db96SPeter Hurley if (uart_console(uport) && tty) 249ae84db96SPeter Hurley uport->cons->cflag = tty->termios.c_cflag; 250ae84db96SPeter Hurley 251adc8d746SAlan Cox if (!tty || (tty->termios.c_cflag & HUPCL)) 252ab4382d2SGreg Kroah-Hartman uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); 253ab4382d2SGreg Kroah-Hartman 254b922e19dSJiri Slaby uart_port_shutdown(port); 255ab4382d2SGreg Kroah-Hartman } 256ab4382d2SGreg Kroah-Hartman 257ab4382d2SGreg Kroah-Hartman /* 258d208a3bfSDoug Anderson * It's possible for shutdown to be called after suspend if we get 259d208a3bfSDoug Anderson * a DCD drop (hangup) at just the right time. Clear suspended bit so 260d208a3bfSDoug Anderson * we don't try to resume a port that has been shutdown. 261ab4382d2SGreg Kroah-Hartman */ 262d208a3bfSDoug Anderson clear_bit(ASYNCB_SUSPENDED, &port->flags); 263ab4382d2SGreg Kroah-Hartman 264ab4382d2SGreg Kroah-Hartman /* 265ab4382d2SGreg Kroah-Hartman * Free the transmit buffer page. 266ab4382d2SGreg Kroah-Hartman */ 267ab4382d2SGreg Kroah-Hartman if (state->xmit.buf) { 268ab4382d2SGreg Kroah-Hartman free_page((unsigned long)state->xmit.buf); 269ab4382d2SGreg Kroah-Hartman state->xmit.buf = NULL; 270ab4382d2SGreg Kroah-Hartman } 271ab4382d2SGreg Kroah-Hartman } 272ab4382d2SGreg Kroah-Hartman 273ab4382d2SGreg Kroah-Hartman /** 274ab4382d2SGreg Kroah-Hartman * uart_update_timeout - update per-port FIFO timeout. 275ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port 276ab4382d2SGreg Kroah-Hartman * @cflag: termios cflag value 277ab4382d2SGreg Kroah-Hartman * @baud: speed of the port 278ab4382d2SGreg Kroah-Hartman * 279ab4382d2SGreg Kroah-Hartman * Set the port FIFO timeout value. The @cflag value should 280ab4382d2SGreg Kroah-Hartman * reflect the actual hardware settings. 281ab4382d2SGreg Kroah-Hartman */ 282ab4382d2SGreg Kroah-Hartman void 283ab4382d2SGreg Kroah-Hartman uart_update_timeout(struct uart_port *port, unsigned int cflag, 284ab4382d2SGreg Kroah-Hartman unsigned int baud) 285ab4382d2SGreg Kroah-Hartman { 286ab4382d2SGreg Kroah-Hartman unsigned int bits; 287ab4382d2SGreg Kroah-Hartman 288ab4382d2SGreg Kroah-Hartman /* byte size and parity */ 289ab4382d2SGreg Kroah-Hartman switch (cflag & CSIZE) { 290ab4382d2SGreg Kroah-Hartman case CS5: 291ab4382d2SGreg Kroah-Hartman bits = 7; 292ab4382d2SGreg Kroah-Hartman break; 293ab4382d2SGreg Kroah-Hartman case CS6: 294ab4382d2SGreg Kroah-Hartman bits = 8; 295ab4382d2SGreg Kroah-Hartman break; 296ab4382d2SGreg Kroah-Hartman case CS7: 297ab4382d2SGreg Kroah-Hartman bits = 9; 298ab4382d2SGreg Kroah-Hartman break; 299ab4382d2SGreg Kroah-Hartman default: 300ab4382d2SGreg Kroah-Hartman bits = 10; 301ab4382d2SGreg Kroah-Hartman break; /* CS8 */ 302ab4382d2SGreg Kroah-Hartman } 303ab4382d2SGreg Kroah-Hartman 304ab4382d2SGreg Kroah-Hartman if (cflag & CSTOPB) 305ab4382d2SGreg Kroah-Hartman bits++; 306ab4382d2SGreg Kroah-Hartman if (cflag & PARENB) 307ab4382d2SGreg Kroah-Hartman bits++; 308ab4382d2SGreg Kroah-Hartman 309ab4382d2SGreg Kroah-Hartman /* 310ab4382d2SGreg Kroah-Hartman * The total number of bits to be transmitted in the fifo. 311ab4382d2SGreg Kroah-Hartman */ 312ab4382d2SGreg Kroah-Hartman bits = bits * port->fifosize; 313ab4382d2SGreg Kroah-Hartman 314ab4382d2SGreg Kroah-Hartman /* 315ab4382d2SGreg Kroah-Hartman * Figure the timeout to send the above number of bits. 316ab4382d2SGreg Kroah-Hartman * Add .02 seconds of slop 317ab4382d2SGreg Kroah-Hartman */ 318ab4382d2SGreg Kroah-Hartman port->timeout = (HZ * bits) / baud + HZ/50; 319ab4382d2SGreg Kroah-Hartman } 320ab4382d2SGreg Kroah-Hartman 321ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_update_timeout); 322ab4382d2SGreg Kroah-Hartman 323ab4382d2SGreg Kroah-Hartman /** 324ab4382d2SGreg Kroah-Hartman * uart_get_baud_rate - return baud rate for a particular port 325ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port in question. 326ab4382d2SGreg Kroah-Hartman * @termios: desired termios settings. 327ab4382d2SGreg Kroah-Hartman * @old: old termios (or NULL) 328ab4382d2SGreg Kroah-Hartman * @min: minimum acceptable baud rate 329ab4382d2SGreg Kroah-Hartman * @max: maximum acceptable baud rate 330ab4382d2SGreg Kroah-Hartman * 331ab4382d2SGreg Kroah-Hartman * Decode the termios structure into a numeric baud rate, 332ab4382d2SGreg Kroah-Hartman * taking account of the magic 38400 baud rate (with spd_* 333ab4382d2SGreg Kroah-Hartman * flags), and mapping the %B0 rate to 9600 baud. 334ab4382d2SGreg Kroah-Hartman * 335ab4382d2SGreg Kroah-Hartman * If the new baud rate is invalid, try the old termios setting. 336ab4382d2SGreg Kroah-Hartman * If it's still invalid, we try 9600 baud. 337ab4382d2SGreg Kroah-Hartman * 338ab4382d2SGreg Kroah-Hartman * Update the @termios structure to reflect the baud rate 339ab4382d2SGreg Kroah-Hartman * we're actually going to be using. Don't do this for the case 340ab4382d2SGreg Kroah-Hartman * where B0 is requested ("hang up"). 341ab4382d2SGreg Kroah-Hartman */ 342ab4382d2SGreg Kroah-Hartman unsigned int 343ab4382d2SGreg Kroah-Hartman uart_get_baud_rate(struct uart_port *port, struct ktermios *termios, 344ab4382d2SGreg Kroah-Hartman struct ktermios *old, unsigned int min, unsigned int max) 345ab4382d2SGreg Kroah-Hartman { 346ab4382d2SGreg Kroah-Hartman unsigned int try, baud, altbaud = 38400; 347ab4382d2SGreg Kroah-Hartman int hung_up = 0; 348ab4382d2SGreg Kroah-Hartman upf_t flags = port->flags & UPF_SPD_MASK; 349ab4382d2SGreg Kroah-Hartman 350ab4382d2SGreg Kroah-Hartman if (flags == UPF_SPD_HI) 351ab4382d2SGreg Kroah-Hartman altbaud = 57600; 352ab4382d2SGreg Kroah-Hartman else if (flags == UPF_SPD_VHI) 353ab4382d2SGreg Kroah-Hartman altbaud = 115200; 354ab4382d2SGreg Kroah-Hartman else if (flags == UPF_SPD_SHI) 355ab4382d2SGreg Kroah-Hartman altbaud = 230400; 356ab4382d2SGreg Kroah-Hartman else if (flags == UPF_SPD_WARP) 357ab4382d2SGreg Kroah-Hartman altbaud = 460800; 358ab4382d2SGreg Kroah-Hartman 359ab4382d2SGreg Kroah-Hartman for (try = 0; try < 2; try++) { 360ab4382d2SGreg Kroah-Hartman baud = tty_termios_baud_rate(termios); 361ab4382d2SGreg Kroah-Hartman 362ab4382d2SGreg Kroah-Hartman /* 363ab4382d2SGreg Kroah-Hartman * The spd_hi, spd_vhi, spd_shi, spd_warp kludge... 364ab4382d2SGreg Kroah-Hartman * Die! Die! Die! 365ab4382d2SGreg Kroah-Hartman */ 366547039ecSPeter Hurley if (try == 0 && baud == 38400) 367ab4382d2SGreg Kroah-Hartman baud = altbaud; 368ab4382d2SGreg Kroah-Hartman 369ab4382d2SGreg Kroah-Hartman /* 370ab4382d2SGreg Kroah-Hartman * Special case: B0 rate. 371ab4382d2SGreg Kroah-Hartman */ 372ab4382d2SGreg Kroah-Hartman if (baud == 0) { 373ab4382d2SGreg Kroah-Hartman hung_up = 1; 374ab4382d2SGreg Kroah-Hartman baud = 9600; 375ab4382d2SGreg Kroah-Hartman } 376ab4382d2SGreg Kroah-Hartman 377ab4382d2SGreg Kroah-Hartman if (baud >= min && baud <= max) 378ab4382d2SGreg Kroah-Hartman return baud; 379ab4382d2SGreg Kroah-Hartman 380ab4382d2SGreg Kroah-Hartman /* 381ab4382d2SGreg Kroah-Hartman * Oops, the quotient was zero. Try again with 382ab4382d2SGreg Kroah-Hartman * the old baud rate if possible. 383ab4382d2SGreg Kroah-Hartman */ 384ab4382d2SGreg Kroah-Hartman termios->c_cflag &= ~CBAUD; 385ab4382d2SGreg Kroah-Hartman if (old) { 386ab4382d2SGreg Kroah-Hartman baud = tty_termios_baud_rate(old); 387ab4382d2SGreg Kroah-Hartman if (!hung_up) 388ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 389ab4382d2SGreg Kroah-Hartman baud, baud); 390ab4382d2SGreg Kroah-Hartman old = NULL; 391ab4382d2SGreg Kroah-Hartman continue; 392ab4382d2SGreg Kroah-Hartman } 393ab4382d2SGreg Kroah-Hartman 394ab4382d2SGreg Kroah-Hartman /* 395ab4382d2SGreg Kroah-Hartman * As a last resort, if the range cannot be met then clip to 396ab4382d2SGreg Kroah-Hartman * the nearest chip supported rate. 397ab4382d2SGreg Kroah-Hartman */ 398ab4382d2SGreg Kroah-Hartman if (!hung_up) { 399ab4382d2SGreg Kroah-Hartman if (baud <= min) 400ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 401ab4382d2SGreg Kroah-Hartman min + 1, min + 1); 402ab4382d2SGreg Kroah-Hartman else 403ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 404ab4382d2SGreg Kroah-Hartman max - 1, max - 1); 405ab4382d2SGreg Kroah-Hartman } 406ab4382d2SGreg Kroah-Hartman } 407ab4382d2SGreg Kroah-Hartman /* Should never happen */ 408ab4382d2SGreg Kroah-Hartman WARN_ON(1); 409ab4382d2SGreg Kroah-Hartman return 0; 410ab4382d2SGreg Kroah-Hartman } 411ab4382d2SGreg Kroah-Hartman 412ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_get_baud_rate); 413ab4382d2SGreg Kroah-Hartman 414ab4382d2SGreg Kroah-Hartman /** 415ab4382d2SGreg Kroah-Hartman * uart_get_divisor - return uart clock divisor 416ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port. 417ab4382d2SGreg Kroah-Hartman * @baud: desired baud rate 418ab4382d2SGreg Kroah-Hartman * 419ab4382d2SGreg Kroah-Hartman * Calculate the uart clock divisor for the port. 420ab4382d2SGreg Kroah-Hartman */ 421ab4382d2SGreg Kroah-Hartman unsigned int 422ab4382d2SGreg Kroah-Hartman uart_get_divisor(struct uart_port *port, unsigned int baud) 423ab4382d2SGreg Kroah-Hartman { 424ab4382d2SGreg Kroah-Hartman unsigned int quot; 425ab4382d2SGreg Kroah-Hartman 426ab4382d2SGreg Kroah-Hartman /* 427ab4382d2SGreg Kroah-Hartman * Old custom speed handling. 428ab4382d2SGreg Kroah-Hartman */ 429ab4382d2SGreg Kroah-Hartman if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) 430ab4382d2SGreg Kroah-Hartman quot = port->custom_divisor; 431ab4382d2SGreg Kroah-Hartman else 43297d24634SUwe Kleine-König quot = DIV_ROUND_CLOSEST(port->uartclk, 16 * baud); 433ab4382d2SGreg Kroah-Hartman 434ab4382d2SGreg Kroah-Hartman return quot; 435ab4382d2SGreg Kroah-Hartman } 436ab4382d2SGreg Kroah-Hartman 437ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_get_divisor); 438ab4382d2SGreg Kroah-Hartman 4397c8ab967SPeter Hurley /* Caller holds port mutex */ 440ab4382d2SGreg Kroah-Hartman static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, 441ab4382d2SGreg Kroah-Hartman struct ktermios *old_termios) 442ab4382d2SGreg Kroah-Hartman { 443ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 444ab4382d2SGreg Kroah-Hartman struct ktermios *termios; 445ab4382d2SGreg Kroah-Hartman 446ab4382d2SGreg Kroah-Hartman /* 447ab4382d2SGreg Kroah-Hartman * If we have no tty, termios, or the port does not exist, 448ab4382d2SGreg Kroah-Hartman * then we can't set the parameters for this port. 449ab4382d2SGreg Kroah-Hartman */ 450adc8d746SAlan Cox if (!tty || uport->type == PORT_UNKNOWN) 451ab4382d2SGreg Kroah-Hartman return; 452ab4382d2SGreg Kroah-Hartman 453adc8d746SAlan Cox termios = &tty->termios; 454c18b55fdSPeter Hurley uport->ops->set_termios(uport, termios, old_termios); 455ab4382d2SGreg Kroah-Hartman 456ab4382d2SGreg Kroah-Hartman /* 457299245a1SPeter Hurley * Set modem status enables based on termios cflag 458ab4382d2SGreg Kroah-Hartman */ 459299245a1SPeter Hurley spin_lock_irq(&uport->lock); 460ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CRTSCTS) 461299245a1SPeter Hurley uport->status |= UPSTAT_CTS_ENABLE; 462ab4382d2SGreg Kroah-Hartman else 463299245a1SPeter Hurley uport->status &= ~UPSTAT_CTS_ENABLE; 464ab4382d2SGreg Kroah-Hartman 465ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CLOCAL) 466299245a1SPeter Hurley uport->status &= ~UPSTAT_DCD_ENABLE; 467ab4382d2SGreg Kroah-Hartman else 468299245a1SPeter Hurley uport->status |= UPSTAT_DCD_ENABLE; 469299245a1SPeter Hurley spin_unlock_irq(&uport->lock); 470ab4382d2SGreg Kroah-Hartman } 471ab4382d2SGreg Kroah-Hartman 472ab4382d2SGreg Kroah-Hartman static inline int __uart_put_char(struct uart_port *port, 473ab4382d2SGreg Kroah-Hartman struct circ_buf *circ, unsigned char c) 474ab4382d2SGreg Kroah-Hartman { 475ab4382d2SGreg Kroah-Hartman unsigned long flags; 476ab4382d2SGreg Kroah-Hartman int ret = 0; 477ab4382d2SGreg Kroah-Hartman 478ab4382d2SGreg Kroah-Hartman if (!circ->buf) 479ab4382d2SGreg Kroah-Hartman return 0; 480ab4382d2SGreg Kroah-Hartman 481ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 482ab4382d2SGreg Kroah-Hartman if (uart_circ_chars_free(circ) != 0) { 483ab4382d2SGreg Kroah-Hartman circ->buf[circ->head] = c; 484ab4382d2SGreg Kroah-Hartman circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1); 485ab4382d2SGreg Kroah-Hartman ret = 1; 486ab4382d2SGreg Kroah-Hartman } 487ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 488ab4382d2SGreg Kroah-Hartman return ret; 489ab4382d2SGreg Kroah-Hartman } 490ab4382d2SGreg Kroah-Hartman 491ab4382d2SGreg Kroah-Hartman static int uart_put_char(struct tty_struct *tty, unsigned char ch) 492ab4382d2SGreg Kroah-Hartman { 493ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 494ab4382d2SGreg Kroah-Hartman 495ab4382d2SGreg Kroah-Hartman return __uart_put_char(state->uart_port, &state->xmit, ch); 496ab4382d2SGreg Kroah-Hartman } 497ab4382d2SGreg Kroah-Hartman 498ab4382d2SGreg Kroah-Hartman static void uart_flush_chars(struct tty_struct *tty) 499ab4382d2SGreg Kroah-Hartman { 500ab4382d2SGreg Kroah-Hartman uart_start(tty); 501ab4382d2SGreg Kroah-Hartman } 502ab4382d2SGreg Kroah-Hartman 503ab4382d2SGreg Kroah-Hartman static int uart_write(struct tty_struct *tty, 504ab4382d2SGreg Kroah-Hartman const unsigned char *buf, int count) 505ab4382d2SGreg Kroah-Hartman { 506ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 507ab4382d2SGreg Kroah-Hartman struct uart_port *port; 508ab4382d2SGreg Kroah-Hartman struct circ_buf *circ; 509ab4382d2SGreg Kroah-Hartman unsigned long flags; 510ab4382d2SGreg Kroah-Hartman int c, ret = 0; 511ab4382d2SGreg Kroah-Hartman 512ab4382d2SGreg Kroah-Hartman /* 513ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 514ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 515ab4382d2SGreg Kroah-Hartman */ 516ab4382d2SGreg Kroah-Hartman if (!state) { 517ab4382d2SGreg Kroah-Hartman WARN_ON(1); 518ab4382d2SGreg Kroah-Hartman return -EL3HLT; 519ab4382d2SGreg Kroah-Hartman } 520ab4382d2SGreg Kroah-Hartman 521ab4382d2SGreg Kroah-Hartman port = state->uart_port; 522ab4382d2SGreg Kroah-Hartman circ = &state->xmit; 523ab4382d2SGreg Kroah-Hartman 524ab4382d2SGreg Kroah-Hartman if (!circ->buf) 525ab4382d2SGreg Kroah-Hartman return 0; 526ab4382d2SGreg Kroah-Hartman 527ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 528ab4382d2SGreg Kroah-Hartman while (1) { 529ab4382d2SGreg Kroah-Hartman c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE); 530ab4382d2SGreg Kroah-Hartman if (count < c) 531ab4382d2SGreg Kroah-Hartman c = count; 532ab4382d2SGreg Kroah-Hartman if (c <= 0) 533ab4382d2SGreg Kroah-Hartman break; 534ab4382d2SGreg Kroah-Hartman memcpy(circ->buf + circ->head, buf, c); 535ab4382d2SGreg Kroah-Hartman circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1); 536ab4382d2SGreg Kroah-Hartman buf += c; 537ab4382d2SGreg Kroah-Hartman count -= c; 538ab4382d2SGreg Kroah-Hartman ret += c; 539ab4382d2SGreg Kroah-Hartman } 54064dbee31SPeter Hurley 54164dbee31SPeter Hurley __uart_start(tty); 542ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 543ab4382d2SGreg Kroah-Hartman 544ab4382d2SGreg Kroah-Hartman return ret; 545ab4382d2SGreg Kroah-Hartman } 546ab4382d2SGreg Kroah-Hartman 547ab4382d2SGreg Kroah-Hartman static int uart_write_room(struct tty_struct *tty) 548ab4382d2SGreg Kroah-Hartman { 549ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 550ab4382d2SGreg Kroah-Hartman unsigned long flags; 551ab4382d2SGreg Kroah-Hartman int ret; 552ab4382d2SGreg Kroah-Hartman 553ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&state->uart_port->lock, flags); 554ab4382d2SGreg Kroah-Hartman ret = uart_circ_chars_free(&state->xmit); 555ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&state->uart_port->lock, flags); 556ab4382d2SGreg Kroah-Hartman return ret; 557ab4382d2SGreg Kroah-Hartman } 558ab4382d2SGreg Kroah-Hartman 559ab4382d2SGreg Kroah-Hartman static int uart_chars_in_buffer(struct tty_struct *tty) 560ab4382d2SGreg Kroah-Hartman { 561ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 562ab4382d2SGreg Kroah-Hartman unsigned long flags; 563ab4382d2SGreg Kroah-Hartman int ret; 564ab4382d2SGreg Kroah-Hartman 565ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&state->uart_port->lock, flags); 566ab4382d2SGreg Kroah-Hartman ret = uart_circ_chars_pending(&state->xmit); 567ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&state->uart_port->lock, flags); 568ab4382d2SGreg Kroah-Hartman return ret; 569ab4382d2SGreg Kroah-Hartman } 570ab4382d2SGreg Kroah-Hartman 571ab4382d2SGreg Kroah-Hartman static void uart_flush_buffer(struct tty_struct *tty) 572ab4382d2SGreg Kroah-Hartman { 573ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 574ab4382d2SGreg Kroah-Hartman struct uart_port *port; 575ab4382d2SGreg Kroah-Hartman unsigned long flags; 576ab4382d2SGreg Kroah-Hartman 577ab4382d2SGreg Kroah-Hartman /* 578ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 579ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 580ab4382d2SGreg Kroah-Hartman */ 581ab4382d2SGreg Kroah-Hartman if (!state) { 582ab4382d2SGreg Kroah-Hartman WARN_ON(1); 583ab4382d2SGreg Kroah-Hartman return; 584ab4382d2SGreg Kroah-Hartman } 585ab4382d2SGreg Kroah-Hartman 586ab4382d2SGreg Kroah-Hartman port = state->uart_port; 587ab4382d2SGreg Kroah-Hartman pr_debug("uart_flush_buffer(%d) called\n", tty->index); 588ab4382d2SGreg Kroah-Hartman 589ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 590ab4382d2SGreg Kroah-Hartman uart_circ_clear(&state->xmit); 591ab4382d2SGreg Kroah-Hartman if (port->ops->flush_buffer) 592ab4382d2SGreg Kroah-Hartman port->ops->flush_buffer(port); 593ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 594ab4382d2SGreg Kroah-Hartman tty_wakeup(tty); 595ab4382d2SGreg Kroah-Hartman } 596ab4382d2SGreg Kroah-Hartman 597ab4382d2SGreg Kroah-Hartman /* 598ab4382d2SGreg Kroah-Hartman * This function is used to send a high-priority XON/XOFF character to 599ab4382d2SGreg Kroah-Hartman * the device 600ab4382d2SGreg Kroah-Hartman */ 601ab4382d2SGreg Kroah-Hartman static void uart_send_xchar(struct tty_struct *tty, char ch) 602ab4382d2SGreg Kroah-Hartman { 603ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 604ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 605ab4382d2SGreg Kroah-Hartman unsigned long flags; 606ab4382d2SGreg Kroah-Hartman 607ab4382d2SGreg Kroah-Hartman if (port->ops->send_xchar) 608ab4382d2SGreg Kroah-Hartman port->ops->send_xchar(port, ch); 609ab4382d2SGreg Kroah-Hartman else { 610ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 611c235ccc1SPeter Hurley port->x_char = ch; 612c235ccc1SPeter Hurley if (ch) 613ab4382d2SGreg Kroah-Hartman port->ops->start_tx(port); 614ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 615ab4382d2SGreg Kroah-Hartman } 616ab4382d2SGreg Kroah-Hartman } 617ab4382d2SGreg Kroah-Hartman 618ab4382d2SGreg Kroah-Hartman static void uart_throttle(struct tty_struct *tty) 619ab4382d2SGreg Kroah-Hartman { 620ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 6219aba8d5bSRussell King struct uart_port *port = state->uart_port; 62291f189deSPeter Hurley upf_t mask = 0; 623ab4382d2SGreg Kroah-Hartman 624ab4382d2SGreg Kroah-Hartman if (I_IXOFF(tty)) 6259aba8d5bSRussell King mask |= UPF_SOFT_FLOW; 6269aba8d5bSRussell King if (tty->termios.c_cflag & CRTSCTS) 6279aba8d5bSRussell King mask |= UPF_HARD_FLOW; 6289aba8d5bSRussell King 6299aba8d5bSRussell King if (port->flags & mask) { 6309aba8d5bSRussell King port->ops->throttle(port); 6319aba8d5bSRussell King mask &= ~port->flags; 6329aba8d5bSRussell King } 6339aba8d5bSRussell King 6349aba8d5bSRussell King if (mask & UPF_SOFT_FLOW) 635ab4382d2SGreg Kroah-Hartman uart_send_xchar(tty, STOP_CHAR(tty)); 636ab4382d2SGreg Kroah-Hartman 6379aba8d5bSRussell King if (mask & UPF_HARD_FLOW) 6389aba8d5bSRussell King uart_clear_mctrl(port, TIOCM_RTS); 639ab4382d2SGreg Kroah-Hartman } 640ab4382d2SGreg Kroah-Hartman 641ab4382d2SGreg Kroah-Hartman static void uart_unthrottle(struct tty_struct *tty) 642ab4382d2SGreg Kroah-Hartman { 643ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 644ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 64591f189deSPeter Hurley upf_t mask = 0; 646ab4382d2SGreg Kroah-Hartman 6479aba8d5bSRussell King if (I_IXOFF(tty)) 6489aba8d5bSRussell King mask |= UPF_SOFT_FLOW; 6499aba8d5bSRussell King if (tty->termios.c_cflag & CRTSCTS) 6509aba8d5bSRussell King mask |= UPF_HARD_FLOW; 6519aba8d5bSRussell King 6529aba8d5bSRussell King if (port->flags & mask) { 6539aba8d5bSRussell King port->ops->unthrottle(port); 6549aba8d5bSRussell King mask &= ~port->flags; 6559aba8d5bSRussell King } 6569aba8d5bSRussell King 657fba594a8SPeter Hurley if (mask & UPF_SOFT_FLOW) 658ab4382d2SGreg Kroah-Hartman uart_send_xchar(tty, START_CHAR(tty)); 659ab4382d2SGreg Kroah-Hartman 6609aba8d5bSRussell King if (mask & UPF_HARD_FLOW) 661ab4382d2SGreg Kroah-Hartman uart_set_mctrl(port, TIOCM_RTS); 662ab4382d2SGreg Kroah-Hartman } 663ab4382d2SGreg Kroah-Hartman 6649f109694SAlan Cox static void do_uart_get_info(struct tty_port *port, 6657ba2e769SAlan Cox struct serial_struct *retinfo) 666ab4382d2SGreg Kroah-Hartman { 6679f109694SAlan Cox struct uart_state *state = container_of(port, struct uart_state, port); 668ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 6697ba2e769SAlan Cox 67037cd0c99SFengguang Wu memset(retinfo, 0, sizeof(*retinfo)); 6717ba2e769SAlan Cox 6727ba2e769SAlan Cox retinfo->type = uport->type; 6737ba2e769SAlan Cox retinfo->line = uport->line; 6747ba2e769SAlan Cox retinfo->port = uport->iobase; 6757ba2e769SAlan Cox if (HIGH_BITS_OFFSET) 6767ba2e769SAlan Cox retinfo->port_high = (long) uport->iobase >> HIGH_BITS_OFFSET; 6777ba2e769SAlan Cox retinfo->irq = uport->irq; 6787ba2e769SAlan Cox retinfo->flags = uport->flags; 6797ba2e769SAlan Cox retinfo->xmit_fifo_size = uport->fifosize; 6807ba2e769SAlan Cox retinfo->baud_base = uport->uartclk / 16; 6817ba2e769SAlan Cox retinfo->close_delay = jiffies_to_msecs(port->close_delay) / 10; 6827ba2e769SAlan Cox retinfo->closing_wait = port->closing_wait == ASYNC_CLOSING_WAIT_NONE ? 6837ba2e769SAlan Cox ASYNC_CLOSING_WAIT_NONE : 6847ba2e769SAlan Cox jiffies_to_msecs(port->closing_wait) / 10; 6857ba2e769SAlan Cox retinfo->custom_divisor = uport->custom_divisor; 6867ba2e769SAlan Cox retinfo->hub6 = uport->hub6; 6877ba2e769SAlan Cox retinfo->io_type = uport->iotype; 6887ba2e769SAlan Cox retinfo->iomem_reg_shift = uport->regshift; 6897ba2e769SAlan Cox retinfo->iomem_base = (void *)(unsigned long)uport->mapbase; 6907ba2e769SAlan Cox } 6917ba2e769SAlan Cox 6929f109694SAlan Cox static void uart_get_info(struct tty_port *port, 6939f109694SAlan Cox struct serial_struct *retinfo) 6947ba2e769SAlan Cox { 695ab4382d2SGreg Kroah-Hartman /* Ensure the state we copy is consistent and no hardware changes 696ab4382d2SGreg Kroah-Hartman occur as we go */ 697ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 6989f109694SAlan Cox do_uart_get_info(port, retinfo); 699ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 7009f109694SAlan Cox } 7019f109694SAlan Cox 7029f109694SAlan Cox static int uart_get_info_user(struct tty_port *port, 7039f109694SAlan Cox struct serial_struct __user *retinfo) 7049f109694SAlan Cox { 7059f109694SAlan Cox struct serial_struct tmp; 7069f109694SAlan Cox uart_get_info(port, &tmp); 707ab4382d2SGreg Kroah-Hartman 708ab4382d2SGreg Kroah-Hartman if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) 709ab4382d2SGreg Kroah-Hartman return -EFAULT; 710ab4382d2SGreg Kroah-Hartman return 0; 711ab4382d2SGreg Kroah-Hartman } 712ab4382d2SGreg Kroah-Hartman 7137ba2e769SAlan Cox static int uart_set_info(struct tty_struct *tty, struct tty_port *port, 7147ba2e769SAlan Cox struct uart_state *state, 7157ba2e769SAlan Cox struct serial_struct *new_info) 716ab4382d2SGreg Kroah-Hartman { 717ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 718ab4382d2SGreg Kroah-Hartman unsigned long new_port; 719ab4382d2SGreg Kroah-Hartman unsigned int change_irq, change_port, closing_wait; 720ab4382d2SGreg Kroah-Hartman unsigned int old_custom_divisor, close_delay; 721ab4382d2SGreg Kroah-Hartman upf_t old_flags, new_flags; 722ab4382d2SGreg Kroah-Hartman int retval = 0; 723ab4382d2SGreg Kroah-Hartman 7247ba2e769SAlan Cox new_port = new_info->port; 725ab4382d2SGreg Kroah-Hartman if (HIGH_BITS_OFFSET) 7267ba2e769SAlan Cox new_port += (unsigned long) new_info->port_high << HIGH_BITS_OFFSET; 727ab4382d2SGreg Kroah-Hartman 7287ba2e769SAlan Cox new_info->irq = irq_canonicalize(new_info->irq); 7297ba2e769SAlan Cox close_delay = msecs_to_jiffies(new_info->close_delay * 10); 7307ba2e769SAlan Cox closing_wait = new_info->closing_wait == ASYNC_CLOSING_WAIT_NONE ? 7314cb0fbfdSJiri Slaby ASYNC_CLOSING_WAIT_NONE : 7327ba2e769SAlan Cox msecs_to_jiffies(new_info->closing_wait * 10); 733ab4382d2SGreg Kroah-Hartman 734ab4382d2SGreg Kroah-Hartman 735ab4382d2SGreg Kroah-Hartman change_irq = !(uport->flags & UPF_FIXED_PORT) 7367ba2e769SAlan Cox && new_info->irq != uport->irq; 737ab4382d2SGreg Kroah-Hartman 738ab4382d2SGreg Kroah-Hartman /* 739ab4382d2SGreg Kroah-Hartman * Since changing the 'type' of the port changes its resource 740ab4382d2SGreg Kroah-Hartman * allocations, we should treat type changes the same as 741ab4382d2SGreg Kroah-Hartman * IO port changes. 742ab4382d2SGreg Kroah-Hartman */ 743ab4382d2SGreg Kroah-Hartman change_port = !(uport->flags & UPF_FIXED_PORT) 744ab4382d2SGreg Kroah-Hartman && (new_port != uport->iobase || 7457ba2e769SAlan Cox (unsigned long)new_info->iomem_base != uport->mapbase || 7467ba2e769SAlan Cox new_info->hub6 != uport->hub6 || 7477ba2e769SAlan Cox new_info->io_type != uport->iotype || 7487ba2e769SAlan Cox new_info->iomem_reg_shift != uport->regshift || 7497ba2e769SAlan Cox new_info->type != uport->type); 750ab4382d2SGreg Kroah-Hartman 751ab4382d2SGreg Kroah-Hartman old_flags = uport->flags; 7527ba2e769SAlan Cox new_flags = new_info->flags; 753ab4382d2SGreg Kroah-Hartman old_custom_divisor = uport->custom_divisor; 754ab4382d2SGreg Kroah-Hartman 755ab4382d2SGreg Kroah-Hartman if (!capable(CAP_SYS_ADMIN)) { 756ab4382d2SGreg Kroah-Hartman retval = -EPERM; 757ab4382d2SGreg Kroah-Hartman if (change_irq || change_port || 7587ba2e769SAlan Cox (new_info->baud_base != uport->uartclk / 16) || 759ab4382d2SGreg Kroah-Hartman (close_delay != port->close_delay) || 760ab4382d2SGreg Kroah-Hartman (closing_wait != port->closing_wait) || 7617ba2e769SAlan Cox (new_info->xmit_fifo_size && 7627ba2e769SAlan Cox new_info->xmit_fifo_size != uport->fifosize) || 763ab4382d2SGreg Kroah-Hartman (((new_flags ^ old_flags) & ~UPF_USR_MASK) != 0)) 764ab4382d2SGreg Kroah-Hartman goto exit; 765ab4382d2SGreg Kroah-Hartman uport->flags = ((uport->flags & ~UPF_USR_MASK) | 766ab4382d2SGreg Kroah-Hartman (new_flags & UPF_USR_MASK)); 7677ba2e769SAlan Cox uport->custom_divisor = new_info->custom_divisor; 768ab4382d2SGreg Kroah-Hartman goto check_and_exit; 769ab4382d2SGreg Kroah-Hartman } 770ab4382d2SGreg Kroah-Hartman 771ab4382d2SGreg Kroah-Hartman /* 772ab4382d2SGreg Kroah-Hartman * Ask the low level driver to verify the settings. 773ab4382d2SGreg Kroah-Hartman */ 774ab4382d2SGreg Kroah-Hartman if (uport->ops->verify_port) 7757ba2e769SAlan Cox retval = uport->ops->verify_port(uport, new_info); 776ab4382d2SGreg Kroah-Hartman 7777ba2e769SAlan Cox if ((new_info->irq >= nr_irqs) || (new_info->irq < 0) || 7787ba2e769SAlan Cox (new_info->baud_base < 9600)) 779ab4382d2SGreg Kroah-Hartman retval = -EINVAL; 780ab4382d2SGreg Kroah-Hartman 781ab4382d2SGreg Kroah-Hartman if (retval) 782ab4382d2SGreg Kroah-Hartman goto exit; 783ab4382d2SGreg Kroah-Hartman 784ab4382d2SGreg Kroah-Hartman if (change_port || change_irq) { 785ab4382d2SGreg Kroah-Hartman retval = -EBUSY; 786ab4382d2SGreg Kroah-Hartman 787ab4382d2SGreg Kroah-Hartman /* 788ab4382d2SGreg Kroah-Hartman * Make sure that we are the sole user of this port. 789ab4382d2SGreg Kroah-Hartman */ 790ab4382d2SGreg Kroah-Hartman if (tty_port_users(port) > 1) 791ab4382d2SGreg Kroah-Hartman goto exit; 792ab4382d2SGreg Kroah-Hartman 793ab4382d2SGreg Kroah-Hartman /* 794ab4382d2SGreg Kroah-Hartman * We need to shutdown the serial port at the old 795ab4382d2SGreg Kroah-Hartman * port/type/irq combination. 796ab4382d2SGreg Kroah-Hartman */ 797ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 798ab4382d2SGreg Kroah-Hartman } 799ab4382d2SGreg Kroah-Hartman 800ab4382d2SGreg Kroah-Hartman if (change_port) { 801ab4382d2SGreg Kroah-Hartman unsigned long old_iobase, old_mapbase; 802ab4382d2SGreg Kroah-Hartman unsigned int old_type, old_iotype, old_hub6, old_shift; 803ab4382d2SGreg Kroah-Hartman 804ab4382d2SGreg Kroah-Hartman old_iobase = uport->iobase; 805ab4382d2SGreg Kroah-Hartman old_mapbase = uport->mapbase; 806ab4382d2SGreg Kroah-Hartman old_type = uport->type; 807ab4382d2SGreg Kroah-Hartman old_hub6 = uport->hub6; 808ab4382d2SGreg Kroah-Hartman old_iotype = uport->iotype; 809ab4382d2SGreg Kroah-Hartman old_shift = uport->regshift; 810ab4382d2SGreg Kroah-Hartman 811ab4382d2SGreg Kroah-Hartman /* 812ab4382d2SGreg Kroah-Hartman * Free and release old regions 813ab4382d2SGreg Kroah-Hartman */ 814ab4382d2SGreg Kroah-Hartman if (old_type != PORT_UNKNOWN) 815ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 816ab4382d2SGreg Kroah-Hartman 817ab4382d2SGreg Kroah-Hartman uport->iobase = new_port; 8187ba2e769SAlan Cox uport->type = new_info->type; 8197ba2e769SAlan Cox uport->hub6 = new_info->hub6; 8207ba2e769SAlan Cox uport->iotype = new_info->io_type; 8217ba2e769SAlan Cox uport->regshift = new_info->iomem_reg_shift; 8227ba2e769SAlan Cox uport->mapbase = (unsigned long)new_info->iomem_base; 823ab4382d2SGreg Kroah-Hartman 824ab4382d2SGreg Kroah-Hartman /* 825ab4382d2SGreg Kroah-Hartman * Claim and map the new regions 826ab4382d2SGreg Kroah-Hartman */ 827ab4382d2SGreg Kroah-Hartman if (uport->type != PORT_UNKNOWN) { 828ab4382d2SGreg Kroah-Hartman retval = uport->ops->request_port(uport); 829ab4382d2SGreg Kroah-Hartman } else { 830ab4382d2SGreg Kroah-Hartman /* Always success - Jean II */ 831ab4382d2SGreg Kroah-Hartman retval = 0; 832ab4382d2SGreg Kroah-Hartman } 833ab4382d2SGreg Kroah-Hartman 834ab4382d2SGreg Kroah-Hartman /* 835ab4382d2SGreg Kroah-Hartman * If we fail to request resources for the 836ab4382d2SGreg Kroah-Hartman * new port, try to restore the old settings. 837ab4382d2SGreg Kroah-Hartman */ 8387deb39edSThomas Pfaff if (retval) { 839ab4382d2SGreg Kroah-Hartman uport->iobase = old_iobase; 840ab4382d2SGreg Kroah-Hartman uport->type = old_type; 841ab4382d2SGreg Kroah-Hartman uport->hub6 = old_hub6; 842ab4382d2SGreg Kroah-Hartman uport->iotype = old_iotype; 843ab4382d2SGreg Kroah-Hartman uport->regshift = old_shift; 844ab4382d2SGreg Kroah-Hartman uport->mapbase = old_mapbase; 8457deb39edSThomas Pfaff 8467deb39edSThomas Pfaff if (old_type != PORT_UNKNOWN) { 847ab4382d2SGreg Kroah-Hartman retval = uport->ops->request_port(uport); 848ab4382d2SGreg Kroah-Hartman /* 849ab4382d2SGreg Kroah-Hartman * If we failed to restore the old settings, 850ab4382d2SGreg Kroah-Hartman * we fail like this. 851ab4382d2SGreg Kroah-Hartman */ 852ab4382d2SGreg Kroah-Hartman if (retval) 853ab4382d2SGreg Kroah-Hartman uport->type = PORT_UNKNOWN; 854ab4382d2SGreg Kroah-Hartman 855ab4382d2SGreg Kroah-Hartman /* 856ab4382d2SGreg Kroah-Hartman * We failed anyway. 857ab4382d2SGreg Kroah-Hartman */ 858ab4382d2SGreg Kroah-Hartman retval = -EBUSY; 8597deb39edSThomas Pfaff } 8607deb39edSThomas Pfaff 861ab4382d2SGreg Kroah-Hartman /* Added to return the correct error -Ram Gupta */ 862ab4382d2SGreg Kroah-Hartman goto exit; 863ab4382d2SGreg Kroah-Hartman } 864ab4382d2SGreg Kroah-Hartman } 865ab4382d2SGreg Kroah-Hartman 866ab4382d2SGreg Kroah-Hartman if (change_irq) 8677ba2e769SAlan Cox uport->irq = new_info->irq; 868ab4382d2SGreg Kroah-Hartman if (!(uport->flags & UPF_FIXED_PORT)) 8697ba2e769SAlan Cox uport->uartclk = new_info->baud_base * 16; 870ab4382d2SGreg Kroah-Hartman uport->flags = (uport->flags & ~UPF_CHANGE_MASK) | 871ab4382d2SGreg Kroah-Hartman (new_flags & UPF_CHANGE_MASK); 8727ba2e769SAlan Cox uport->custom_divisor = new_info->custom_divisor; 873ab4382d2SGreg Kroah-Hartman port->close_delay = close_delay; 874ab4382d2SGreg Kroah-Hartman port->closing_wait = closing_wait; 8757ba2e769SAlan Cox if (new_info->xmit_fifo_size) 8767ba2e769SAlan Cox uport->fifosize = new_info->xmit_fifo_size; 877d6c53c0eSJiri Slaby port->low_latency = (uport->flags & UPF_LOW_LATENCY) ? 1 : 0; 878ab4382d2SGreg Kroah-Hartman 879ab4382d2SGreg Kroah-Hartman check_and_exit: 880ab4382d2SGreg Kroah-Hartman retval = 0; 881ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) 882ab4382d2SGreg Kroah-Hartman goto exit; 883ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_INITIALIZED) { 884ab4382d2SGreg Kroah-Hartman if (((old_flags ^ uport->flags) & UPF_SPD_MASK) || 885ab4382d2SGreg Kroah-Hartman old_custom_divisor != uport->custom_divisor) { 886ab4382d2SGreg Kroah-Hartman /* 887ab4382d2SGreg Kroah-Hartman * If they're setting up a custom divisor or speed, 888ab4382d2SGreg Kroah-Hartman * instead of clearing it, then bitch about it. No 889ab4382d2SGreg Kroah-Hartman * need to rate-limit; it's CAP_SYS_ADMIN only. 890ab4382d2SGreg Kroah-Hartman */ 891ab4382d2SGreg Kroah-Hartman if (uport->flags & UPF_SPD_MASK) { 892ab4382d2SGreg Kroah-Hartman char buf[64]; 8932f2dafe7SSudip Mukherjee 8942f2dafe7SSudip Mukherjee dev_notice(uport->dev, 8952f2dafe7SSudip Mukherjee "%s sets custom speed on %s. This is deprecated.\n", 8962f2dafe7SSudip Mukherjee current->comm, 897ab4382d2SGreg Kroah-Hartman tty_name(port->tty, buf)); 898ab4382d2SGreg Kroah-Hartman } 899ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 900ab4382d2SGreg Kroah-Hartman } 901ab4382d2SGreg Kroah-Hartman } else 902ab4382d2SGreg Kroah-Hartman retval = uart_startup(tty, state, 1); 903ab4382d2SGreg Kroah-Hartman exit: 9047ba2e769SAlan Cox return retval; 9057ba2e769SAlan Cox } 9067ba2e769SAlan Cox 9077ba2e769SAlan Cox static int uart_set_info_user(struct tty_struct *tty, struct uart_state *state, 9087ba2e769SAlan Cox struct serial_struct __user *newinfo) 9097ba2e769SAlan Cox { 9107ba2e769SAlan Cox struct serial_struct new_serial; 9117ba2e769SAlan Cox struct tty_port *port = &state->port; 9127ba2e769SAlan Cox int retval; 9137ba2e769SAlan Cox 9147ba2e769SAlan Cox if (copy_from_user(&new_serial, newinfo, sizeof(new_serial))) 9157ba2e769SAlan Cox return -EFAULT; 9167ba2e769SAlan Cox 9177ba2e769SAlan Cox /* 9187ba2e769SAlan Cox * This semaphore protects port->count. It is also 9197ba2e769SAlan Cox * very useful to prevent opens. Also, take the 9207ba2e769SAlan Cox * port configuration semaphore to make sure that a 9217ba2e769SAlan Cox * module insertion/removal doesn't change anything 9227ba2e769SAlan Cox * under us. 9237ba2e769SAlan Cox */ 9247ba2e769SAlan Cox mutex_lock(&port->mutex); 9257ba2e769SAlan Cox retval = uart_set_info(tty, port, state, &new_serial); 926ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 927ab4382d2SGreg Kroah-Hartman return retval; 928ab4382d2SGreg Kroah-Hartman } 929ab4382d2SGreg Kroah-Hartman 930ab4382d2SGreg Kroah-Hartman /** 931ab4382d2SGreg Kroah-Hartman * uart_get_lsr_info - get line status register info 932ab4382d2SGreg Kroah-Hartman * @tty: tty associated with the UART 933ab4382d2SGreg Kroah-Hartman * @state: UART being queried 934ab4382d2SGreg Kroah-Hartman * @value: returned modem value 935ab4382d2SGreg Kroah-Hartman * 936ab4382d2SGreg Kroah-Hartman * Note: uart_ioctl protects us against hangups. 937ab4382d2SGreg Kroah-Hartman */ 938ab4382d2SGreg Kroah-Hartman static int uart_get_lsr_info(struct tty_struct *tty, 939ab4382d2SGreg Kroah-Hartman struct uart_state *state, unsigned int __user *value) 940ab4382d2SGreg Kroah-Hartman { 941ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 942ab4382d2SGreg Kroah-Hartman unsigned int result; 943ab4382d2SGreg Kroah-Hartman 944ab4382d2SGreg Kroah-Hartman result = uport->ops->tx_empty(uport); 945ab4382d2SGreg Kroah-Hartman 946ab4382d2SGreg Kroah-Hartman /* 947ab4382d2SGreg Kroah-Hartman * If we're about to load something into the transmit 948ab4382d2SGreg Kroah-Hartman * register, we'll pretend the transmitter isn't empty to 949ab4382d2SGreg Kroah-Hartman * avoid a race condition (depending on when the transmit 950ab4382d2SGreg Kroah-Hartman * interrupt happens). 951ab4382d2SGreg Kroah-Hartman */ 952ab4382d2SGreg Kroah-Hartman if (uport->x_char || 953ab4382d2SGreg Kroah-Hartman ((uart_circ_chars_pending(&state->xmit) > 0) && 954d01f4d18SPeter Hurley !uart_tx_stopped(uport))) 955ab4382d2SGreg Kroah-Hartman result &= ~TIOCSER_TEMT; 956ab4382d2SGreg Kroah-Hartman 957ab4382d2SGreg Kroah-Hartman return put_user(result, value); 958ab4382d2SGreg Kroah-Hartman } 959ab4382d2SGreg Kroah-Hartman 96060b33c13SAlan Cox static int uart_tiocmget(struct tty_struct *tty) 961ab4382d2SGreg Kroah-Hartman { 962ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 963ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 964ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 965ab4382d2SGreg Kroah-Hartman int result = -EIO; 966ab4382d2SGreg Kroah-Hartman 967ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 96860b33c13SAlan Cox if (!(tty->flags & (1 << TTY_IO_ERROR))) { 969ab4382d2SGreg Kroah-Hartman result = uport->mctrl; 970ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 971ab4382d2SGreg Kroah-Hartman result |= uport->ops->get_mctrl(uport); 972ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 973ab4382d2SGreg Kroah-Hartman } 974ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 975ab4382d2SGreg Kroah-Hartman 976ab4382d2SGreg Kroah-Hartman return result; 977ab4382d2SGreg Kroah-Hartman } 978ab4382d2SGreg Kroah-Hartman 979ab4382d2SGreg Kroah-Hartman static int 98020b9d177SAlan Cox uart_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear) 981ab4382d2SGreg Kroah-Hartman { 982ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 983ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 984ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 985ab4382d2SGreg Kroah-Hartman int ret = -EIO; 986ab4382d2SGreg Kroah-Hartman 987ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 98820b9d177SAlan Cox if (!(tty->flags & (1 << TTY_IO_ERROR))) { 989ab4382d2SGreg Kroah-Hartman uart_update_mctrl(uport, set, clear); 990ab4382d2SGreg Kroah-Hartman ret = 0; 991ab4382d2SGreg Kroah-Hartman } 992ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 993ab4382d2SGreg Kroah-Hartman return ret; 994ab4382d2SGreg Kroah-Hartman } 995ab4382d2SGreg Kroah-Hartman 996ab4382d2SGreg Kroah-Hartman static int uart_break_ctl(struct tty_struct *tty, int break_state) 997ab4382d2SGreg Kroah-Hartman { 998ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 999ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1000ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1001ab4382d2SGreg Kroah-Hartman 1002ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1003ab4382d2SGreg Kroah-Hartman 1004ab4382d2SGreg Kroah-Hartman if (uport->type != PORT_UNKNOWN) 1005ab4382d2SGreg Kroah-Hartman uport->ops->break_ctl(uport, break_state); 1006ab4382d2SGreg Kroah-Hartman 1007ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1008ab4382d2SGreg Kroah-Hartman return 0; 1009ab4382d2SGreg Kroah-Hartman } 1010ab4382d2SGreg Kroah-Hartman 1011ab4382d2SGreg Kroah-Hartman static int uart_do_autoconfig(struct tty_struct *tty,struct uart_state *state) 1012ab4382d2SGreg Kroah-Hartman { 1013ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1014ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1015ab4382d2SGreg Kroah-Hartman int flags, ret; 1016ab4382d2SGreg Kroah-Hartman 1017ab4382d2SGreg Kroah-Hartman if (!capable(CAP_SYS_ADMIN)) 1018ab4382d2SGreg Kroah-Hartman return -EPERM; 1019ab4382d2SGreg Kroah-Hartman 1020ab4382d2SGreg Kroah-Hartman /* 1021ab4382d2SGreg Kroah-Hartman * Take the per-port semaphore. This prevents count from 1022ab4382d2SGreg Kroah-Hartman * changing, and hence any extra opens of the port while 1023ab4382d2SGreg Kroah-Hartman * we're auto-configuring. 1024ab4382d2SGreg Kroah-Hartman */ 1025ab4382d2SGreg Kroah-Hartman if (mutex_lock_interruptible(&port->mutex)) 1026ab4382d2SGreg Kroah-Hartman return -ERESTARTSYS; 1027ab4382d2SGreg Kroah-Hartman 1028ab4382d2SGreg Kroah-Hartman ret = -EBUSY; 1029ab4382d2SGreg Kroah-Hartman if (tty_port_users(port) == 1) { 1030ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 1031ab4382d2SGreg Kroah-Hartman 1032ab4382d2SGreg Kroah-Hartman /* 1033ab4382d2SGreg Kroah-Hartman * If we already have a port type configured, 1034ab4382d2SGreg Kroah-Hartman * we must release its resources. 1035ab4382d2SGreg Kroah-Hartman */ 1036ab4382d2SGreg Kroah-Hartman if (uport->type != PORT_UNKNOWN) 1037ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 1038ab4382d2SGreg Kroah-Hartman 1039ab4382d2SGreg Kroah-Hartman flags = UART_CONFIG_TYPE; 1040ab4382d2SGreg Kroah-Hartman if (uport->flags & UPF_AUTO_IRQ) 1041ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_IRQ; 1042ab4382d2SGreg Kroah-Hartman 1043ab4382d2SGreg Kroah-Hartman /* 1044ab4382d2SGreg Kroah-Hartman * This will claim the ports resources if 1045ab4382d2SGreg Kroah-Hartman * a port is found. 1046ab4382d2SGreg Kroah-Hartman */ 1047ab4382d2SGreg Kroah-Hartman uport->ops->config_port(uport, flags); 1048ab4382d2SGreg Kroah-Hartman 1049ab4382d2SGreg Kroah-Hartman ret = uart_startup(tty, state, 1); 1050ab4382d2SGreg Kroah-Hartman } 1051ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1052ab4382d2SGreg Kroah-Hartman return ret; 1053ab4382d2SGreg Kroah-Hartman } 1054ab4382d2SGreg Kroah-Hartman 10551fdc3106SAlexander Shiyan static void uart_enable_ms(struct uart_port *uport) 10561fdc3106SAlexander Shiyan { 10571fdc3106SAlexander Shiyan /* 10581fdc3106SAlexander Shiyan * Force modem status interrupts on 10591fdc3106SAlexander Shiyan */ 10601fdc3106SAlexander Shiyan if (uport->ops->enable_ms) 10611fdc3106SAlexander Shiyan uport->ops->enable_ms(uport); 10621fdc3106SAlexander Shiyan } 10631fdc3106SAlexander Shiyan 1064ab4382d2SGreg Kroah-Hartman /* 1065ab4382d2SGreg Kroah-Hartman * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change 1066ab4382d2SGreg Kroah-Hartman * - mask passed in arg for lines of interest 1067ab4382d2SGreg Kroah-Hartman * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) 1068ab4382d2SGreg Kroah-Hartman * Caller should use TIOCGICOUNT to see which one it was 1069ab4382d2SGreg Kroah-Hartman * 1070ab4382d2SGreg Kroah-Hartman * FIXME: This wants extracting into a common all driver implementation 1071ab4382d2SGreg Kroah-Hartman * of TIOCMWAIT using tty_port. 1072ab4382d2SGreg Kroah-Hartman */ 1073ab4382d2SGreg Kroah-Hartman static int 1074ab4382d2SGreg Kroah-Hartman uart_wait_modem_status(struct uart_state *state, unsigned long arg) 1075ab4382d2SGreg Kroah-Hartman { 1076ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1077ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1078ab4382d2SGreg Kroah-Hartman DECLARE_WAITQUEUE(wait, current); 1079ab4382d2SGreg Kroah-Hartman struct uart_icount cprev, cnow; 1080ab4382d2SGreg Kroah-Hartman int ret; 1081ab4382d2SGreg Kroah-Hartman 1082ab4382d2SGreg Kroah-Hartman /* 1083ab4382d2SGreg Kroah-Hartman * note the counters on entry 1084ab4382d2SGreg Kroah-Hartman */ 1085ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1086ab4382d2SGreg Kroah-Hartman memcpy(&cprev, &uport->icount, sizeof(struct uart_icount)); 10871fdc3106SAlexander Shiyan uart_enable_ms(uport); 1088ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1089ab4382d2SGreg Kroah-Hartman 1090ab4382d2SGreg Kroah-Hartman add_wait_queue(&port->delta_msr_wait, &wait); 1091ab4382d2SGreg Kroah-Hartman for (;;) { 1092ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1093ab4382d2SGreg Kroah-Hartman memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); 1094ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1095ab4382d2SGreg Kroah-Hartman 1096ab4382d2SGreg Kroah-Hartman set_current_state(TASK_INTERRUPTIBLE); 1097ab4382d2SGreg Kroah-Hartman 1098ab4382d2SGreg Kroah-Hartman if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || 1099ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || 1100ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || 1101ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) { 1102ab4382d2SGreg Kroah-Hartman ret = 0; 1103ab4382d2SGreg Kroah-Hartman break; 1104ab4382d2SGreg Kroah-Hartman } 1105ab4382d2SGreg Kroah-Hartman 1106ab4382d2SGreg Kroah-Hartman schedule(); 1107ab4382d2SGreg Kroah-Hartman 1108ab4382d2SGreg Kroah-Hartman /* see if a signal did it */ 1109ab4382d2SGreg Kroah-Hartman if (signal_pending(current)) { 1110ab4382d2SGreg Kroah-Hartman ret = -ERESTARTSYS; 1111ab4382d2SGreg Kroah-Hartman break; 1112ab4382d2SGreg Kroah-Hartman } 1113ab4382d2SGreg Kroah-Hartman 1114ab4382d2SGreg Kroah-Hartman cprev = cnow; 1115ab4382d2SGreg Kroah-Hartman } 1116ab4382d2SGreg Kroah-Hartman 1117ab4382d2SGreg Kroah-Hartman current->state = TASK_RUNNING; 1118ab4382d2SGreg Kroah-Hartman remove_wait_queue(&port->delta_msr_wait, &wait); 1119ab4382d2SGreg Kroah-Hartman 1120ab4382d2SGreg Kroah-Hartman return ret; 1121ab4382d2SGreg Kroah-Hartman } 1122ab4382d2SGreg Kroah-Hartman 1123ab4382d2SGreg Kroah-Hartman /* 1124ab4382d2SGreg Kroah-Hartman * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) 1125ab4382d2SGreg Kroah-Hartman * Return: write counters to the user passed counter struct 1126ab4382d2SGreg Kroah-Hartman * NB: both 1->0 and 0->1 transitions are counted except for 1127ab4382d2SGreg Kroah-Hartman * RI where only 0->1 is counted. 1128ab4382d2SGreg Kroah-Hartman */ 1129ab4382d2SGreg Kroah-Hartman static int uart_get_icount(struct tty_struct *tty, 1130ab4382d2SGreg Kroah-Hartman struct serial_icounter_struct *icount) 1131ab4382d2SGreg Kroah-Hartman { 1132ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1133ab4382d2SGreg Kroah-Hartman struct uart_icount cnow; 1134ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1135ab4382d2SGreg Kroah-Hartman 1136ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1137ab4382d2SGreg Kroah-Hartman memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); 1138ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1139ab4382d2SGreg Kroah-Hartman 1140ab4382d2SGreg Kroah-Hartman icount->cts = cnow.cts; 1141ab4382d2SGreg Kroah-Hartman icount->dsr = cnow.dsr; 1142ab4382d2SGreg Kroah-Hartman icount->rng = cnow.rng; 1143ab4382d2SGreg Kroah-Hartman icount->dcd = cnow.dcd; 1144ab4382d2SGreg Kroah-Hartman icount->rx = cnow.rx; 1145ab4382d2SGreg Kroah-Hartman icount->tx = cnow.tx; 1146ab4382d2SGreg Kroah-Hartman icount->frame = cnow.frame; 1147ab4382d2SGreg Kroah-Hartman icount->overrun = cnow.overrun; 1148ab4382d2SGreg Kroah-Hartman icount->parity = cnow.parity; 1149ab4382d2SGreg Kroah-Hartman icount->brk = cnow.brk; 1150ab4382d2SGreg Kroah-Hartman icount->buf_overrun = cnow.buf_overrun; 1151ab4382d2SGreg Kroah-Hartman 1152ab4382d2SGreg Kroah-Hartman return 0; 1153ab4382d2SGreg Kroah-Hartman } 1154ab4382d2SGreg Kroah-Hartman 1155a5f276f1SRicardo Ribalda Delgado static int uart_get_rs485_config(struct uart_port *port, 1156a5f276f1SRicardo Ribalda Delgado struct serial_rs485 __user *rs485) 1157a5f276f1SRicardo Ribalda Delgado { 1158bd737f87SRicardo Ribalda Delgado unsigned long flags; 1159bd737f87SRicardo Ribalda Delgado struct serial_rs485 aux; 1160bd737f87SRicardo Ribalda Delgado 1161bd737f87SRicardo Ribalda Delgado spin_lock_irqsave(&port->lock, flags); 1162bd737f87SRicardo Ribalda Delgado aux = port->rs485; 1163bd737f87SRicardo Ribalda Delgado spin_unlock_irqrestore(&port->lock, flags); 1164bd737f87SRicardo Ribalda Delgado 1165bd737f87SRicardo Ribalda Delgado if (copy_to_user(rs485, &aux, sizeof(aux))) 1166a5f276f1SRicardo Ribalda Delgado return -EFAULT; 1167bd737f87SRicardo Ribalda Delgado 1168a5f276f1SRicardo Ribalda Delgado return 0; 1169a5f276f1SRicardo Ribalda Delgado } 1170a5f276f1SRicardo Ribalda Delgado 1171a5f276f1SRicardo Ribalda Delgado static int uart_set_rs485_config(struct uart_port *port, 1172a5f276f1SRicardo Ribalda Delgado struct serial_rs485 __user *rs485_user) 1173a5f276f1SRicardo Ribalda Delgado { 1174a5f276f1SRicardo Ribalda Delgado struct serial_rs485 rs485; 1175a5f276f1SRicardo Ribalda Delgado int ret; 1176bd737f87SRicardo Ribalda Delgado unsigned long flags; 1177a5f276f1SRicardo Ribalda Delgado 1178a5f276f1SRicardo Ribalda Delgado if (!port->rs485_config) 1179a5f276f1SRicardo Ribalda Delgado return -ENOIOCTLCMD; 1180a5f276f1SRicardo Ribalda Delgado 1181a5f276f1SRicardo Ribalda Delgado if (copy_from_user(&rs485, rs485_user, sizeof(*rs485_user))) 1182a5f276f1SRicardo Ribalda Delgado return -EFAULT; 1183a5f276f1SRicardo Ribalda Delgado 1184bd737f87SRicardo Ribalda Delgado spin_lock_irqsave(&port->lock, flags); 1185a5f276f1SRicardo Ribalda Delgado ret = port->rs485_config(port, &rs485); 1186bd737f87SRicardo Ribalda Delgado spin_unlock_irqrestore(&port->lock, flags); 1187a5f276f1SRicardo Ribalda Delgado if (ret) 1188a5f276f1SRicardo Ribalda Delgado return ret; 1189a5f276f1SRicardo Ribalda Delgado 1190a5f276f1SRicardo Ribalda Delgado if (copy_to_user(rs485_user, &port->rs485, sizeof(port->rs485))) 1191a5f276f1SRicardo Ribalda Delgado return -EFAULT; 1192a5f276f1SRicardo Ribalda Delgado 1193a5f276f1SRicardo Ribalda Delgado return 0; 1194a5f276f1SRicardo Ribalda Delgado } 1195a5f276f1SRicardo Ribalda Delgado 1196ab4382d2SGreg Kroah-Hartman /* 1197ab4382d2SGreg Kroah-Hartman * Called via sys_ioctl. We can use spin_lock_irq() here. 1198ab4382d2SGreg Kroah-Hartman */ 1199ab4382d2SGreg Kroah-Hartman static int 12006caa76b7SAlan Cox uart_ioctl(struct tty_struct *tty, unsigned int cmd, 1201ab4382d2SGreg Kroah-Hartman unsigned long arg) 1202ab4382d2SGreg Kroah-Hartman { 1203ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1204ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1205ab4382d2SGreg Kroah-Hartman void __user *uarg = (void __user *)arg; 1206ab4382d2SGreg Kroah-Hartman int ret = -ENOIOCTLCMD; 1207ab4382d2SGreg Kroah-Hartman 1208ab4382d2SGreg Kroah-Hartman 1209ab4382d2SGreg Kroah-Hartman /* 1210ab4382d2SGreg Kroah-Hartman * These ioctls don't rely on the hardware to be present. 1211ab4382d2SGreg Kroah-Hartman */ 1212ab4382d2SGreg Kroah-Hartman switch (cmd) { 1213ab4382d2SGreg Kroah-Hartman case TIOCGSERIAL: 12149f109694SAlan Cox ret = uart_get_info_user(port, uarg); 1215ab4382d2SGreg Kroah-Hartman break; 1216ab4382d2SGreg Kroah-Hartman 1217ab4382d2SGreg Kroah-Hartman case TIOCSSERIAL: 12187c8ab967SPeter Hurley down_write(&tty->termios_rwsem); 12197ba2e769SAlan Cox ret = uart_set_info_user(tty, state, uarg); 12207c8ab967SPeter Hurley up_write(&tty->termios_rwsem); 1221ab4382d2SGreg Kroah-Hartman break; 1222ab4382d2SGreg Kroah-Hartman 1223ab4382d2SGreg Kroah-Hartman case TIOCSERCONFIG: 12247c8ab967SPeter Hurley down_write(&tty->termios_rwsem); 1225ab4382d2SGreg Kroah-Hartman ret = uart_do_autoconfig(tty, state); 12267c8ab967SPeter Hurley up_write(&tty->termios_rwsem); 1227ab4382d2SGreg Kroah-Hartman break; 1228ab4382d2SGreg Kroah-Hartman 1229ab4382d2SGreg Kroah-Hartman case TIOCSERGWILD: /* obsolete */ 1230ab4382d2SGreg Kroah-Hartman case TIOCSERSWILD: /* obsolete */ 1231ab4382d2SGreg Kroah-Hartman ret = 0; 1232ab4382d2SGreg Kroah-Hartman break; 1233ab4382d2SGreg Kroah-Hartman } 1234ab4382d2SGreg Kroah-Hartman 1235ab4382d2SGreg Kroah-Hartman if (ret != -ENOIOCTLCMD) 1236ab4382d2SGreg Kroah-Hartman goto out; 1237ab4382d2SGreg Kroah-Hartman 1238ab4382d2SGreg Kroah-Hartman if (tty->flags & (1 << TTY_IO_ERROR)) { 1239ab4382d2SGreg Kroah-Hartman ret = -EIO; 1240ab4382d2SGreg Kroah-Hartman goto out; 1241ab4382d2SGreg Kroah-Hartman } 1242ab4382d2SGreg Kroah-Hartman 1243ab4382d2SGreg Kroah-Hartman /* 1244ab4382d2SGreg Kroah-Hartman * The following should only be used when hardware is present. 1245ab4382d2SGreg Kroah-Hartman */ 1246ab4382d2SGreg Kroah-Hartman switch (cmd) { 1247ab4382d2SGreg Kroah-Hartman case TIOCMIWAIT: 1248ab4382d2SGreg Kroah-Hartman ret = uart_wait_modem_status(state, arg); 1249ab4382d2SGreg Kroah-Hartman break; 1250ab4382d2SGreg Kroah-Hartman } 1251ab4382d2SGreg Kroah-Hartman 1252ab4382d2SGreg Kroah-Hartman if (ret != -ENOIOCTLCMD) 1253ab4382d2SGreg Kroah-Hartman goto out; 1254ab4382d2SGreg Kroah-Hartman 1255ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1256ab4382d2SGreg Kroah-Hartman 12576caa76b7SAlan Cox if (tty->flags & (1 << TTY_IO_ERROR)) { 1258ab4382d2SGreg Kroah-Hartman ret = -EIO; 1259ab4382d2SGreg Kroah-Hartman goto out_up; 1260ab4382d2SGreg Kroah-Hartman } 1261ab4382d2SGreg Kroah-Hartman 1262ab4382d2SGreg Kroah-Hartman /* 1263ab4382d2SGreg Kroah-Hartman * All these rely on hardware being present and need to be 1264ab4382d2SGreg Kroah-Hartman * protected against the tty being hung up. 1265ab4382d2SGreg Kroah-Hartman */ 1266a9c20a9cSRicardo Ribalda Delgado 1267ab4382d2SGreg Kroah-Hartman switch (cmd) { 1268a9c20a9cSRicardo Ribalda Delgado case TIOCSERGETLSR: /* Get line status register */ 1269a9c20a9cSRicardo Ribalda Delgado ret = uart_get_lsr_info(tty, state, uarg); 1270a9c20a9cSRicardo Ribalda Delgado break; 1271a9c20a9cSRicardo Ribalda Delgado 1272a5f276f1SRicardo Ribalda Delgado case TIOCGRS485: 1273a5f276f1SRicardo Ribalda Delgado ret = uart_get_rs485_config(state->uart_port, uarg); 1274a5f276f1SRicardo Ribalda Delgado break; 1275a5f276f1SRicardo Ribalda Delgado 1276a5f276f1SRicardo Ribalda Delgado case TIOCSRS485: 1277a5f276f1SRicardo Ribalda Delgado ret = uart_set_rs485_config(state->uart_port, uarg); 1278a5f276f1SRicardo Ribalda Delgado break; 1279ab4382d2SGreg Kroah-Hartman default: { 1280ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1281ab4382d2SGreg Kroah-Hartman if (uport->ops->ioctl) 1282ab4382d2SGreg Kroah-Hartman ret = uport->ops->ioctl(uport, cmd, arg); 1283ab4382d2SGreg Kroah-Hartman break; 1284ab4382d2SGreg Kroah-Hartman } 1285ab4382d2SGreg Kroah-Hartman } 1286ab4382d2SGreg Kroah-Hartman out_up: 1287ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1288ab4382d2SGreg Kroah-Hartman out: 1289ab4382d2SGreg Kroah-Hartman return ret; 1290ab4382d2SGreg Kroah-Hartman } 1291ab4382d2SGreg Kroah-Hartman 1292ab4382d2SGreg Kroah-Hartman static void uart_set_ldisc(struct tty_struct *tty) 1293ab4382d2SGreg Kroah-Hartman { 1294ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1295ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1296ab4382d2SGreg Kroah-Hartman 1297db1b9dfcSPeter Hurley if (uport->ops->set_ldisc) { 1298db1b9dfcSPeter Hurley mutex_lock(&state->port.mutex); 1299732a84a0SPeter Hurley uport->ops->set_ldisc(uport, &tty->termios); 1300db1b9dfcSPeter Hurley mutex_unlock(&state->port.mutex); 1301db1b9dfcSPeter Hurley } 1302ab4382d2SGreg Kroah-Hartman } 1303ab4382d2SGreg Kroah-Hartman 1304ab4382d2SGreg Kroah-Hartman static void uart_set_termios(struct tty_struct *tty, 1305ab4382d2SGreg Kroah-Hartman struct ktermios *old_termios) 1306ab4382d2SGreg Kroah-Hartman { 1307ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1308dec94e70SRussell King struct uart_port *uport = state->uart_port; 1309adc8d746SAlan Cox unsigned int cflag = tty->termios.c_cflag; 13102cbacafdSRussell King unsigned int iflag_mask = IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK; 13112cbacafdSRussell King bool sw_changed = false; 1312ab4382d2SGreg Kroah-Hartman 13132cbacafdSRussell King /* 13142cbacafdSRussell King * Drivers doing software flow control also need to know 13152cbacafdSRussell King * about changes to these input settings. 13162cbacafdSRussell King */ 13172cbacafdSRussell King if (uport->flags & UPF_SOFT_FLOW) { 13182cbacafdSRussell King iflag_mask |= IXANY|IXON|IXOFF; 13192cbacafdSRussell King sw_changed = 13202cbacafdSRussell King tty->termios.c_cc[VSTART] != old_termios->c_cc[VSTART] || 13212cbacafdSRussell King tty->termios.c_cc[VSTOP] != old_termios->c_cc[VSTOP]; 13222cbacafdSRussell King } 1323ab4382d2SGreg Kroah-Hartman 1324ab4382d2SGreg Kroah-Hartman /* 1325ab4382d2SGreg Kroah-Hartman * These are the bits that are used to setup various 1326ab4382d2SGreg Kroah-Hartman * flags in the low level driver. We can ignore the Bfoo 1327ab4382d2SGreg Kroah-Hartman * bits in c_cflag; c_[io]speed will always be set 1328ab4382d2SGreg Kroah-Hartman * appropriately by set_termios() in tty_ioctl.c 1329ab4382d2SGreg Kroah-Hartman */ 1330ab4382d2SGreg Kroah-Hartman if ((cflag ^ old_termios->c_cflag) == 0 && 1331adc8d746SAlan Cox tty->termios.c_ospeed == old_termios->c_ospeed && 1332adc8d746SAlan Cox tty->termios.c_ispeed == old_termios->c_ispeed && 13332cbacafdSRussell King ((tty->termios.c_iflag ^ old_termios->c_iflag) & iflag_mask) == 0 && 13342cbacafdSRussell King !sw_changed) { 1335ab4382d2SGreg Kroah-Hartman return; 1336ab4382d2SGreg Kroah-Hartman } 1337ab4382d2SGreg Kroah-Hartman 13387c8ab967SPeter Hurley mutex_lock(&state->port.mutex); 1339ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, old_termios); 13407c8ab967SPeter Hurley mutex_unlock(&state->port.mutex); 1341c18b55fdSPeter Hurley /* reload cflag from termios; port driver may have overriden flags */ 1342c18b55fdSPeter Hurley cflag = tty->termios.c_cflag; 1343ab4382d2SGreg Kroah-Hartman 1344ab4382d2SGreg Kroah-Hartman /* Handle transition to B0 status */ 1345ab4382d2SGreg Kroah-Hartman if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) 1346dec94e70SRussell King uart_clear_mctrl(uport, TIOCM_RTS | TIOCM_DTR); 1347ab4382d2SGreg Kroah-Hartman /* Handle transition away from B0 status */ 1348ab4382d2SGreg Kroah-Hartman else if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { 1349ab4382d2SGreg Kroah-Hartman unsigned int mask = TIOCM_DTR; 135099abf3b9SPeter Hurley if (!(cflag & CRTSCTS) || !test_bit(TTY_THROTTLED, &tty->flags)) 1351ab4382d2SGreg Kroah-Hartman mask |= TIOCM_RTS; 1352dec94e70SRussell King uart_set_mctrl(uport, mask); 1353ab4382d2SGreg Kroah-Hartman } 1354ab4382d2SGreg Kroah-Hartman 1355dba05832SRussell King /* 1356dba05832SRussell King * If the port is doing h/w assisted flow control, do nothing. 1357d01f4d18SPeter Hurley * We assume that port->hw_stopped has never been set. 1358dba05832SRussell King */ 1359dba05832SRussell King if (uport->flags & UPF_HARD_FLOW) 1360dba05832SRussell King return; 1361dba05832SRussell King 1362ab4382d2SGreg Kroah-Hartman /* Handle turning off CRTSCTS */ 1363ab4382d2SGreg Kroah-Hartman if ((old_termios->c_cflag & CRTSCTS) && !(cflag & CRTSCTS)) { 1364938f7e13SPeter Hurley spin_lock_irq(&uport->lock); 1365d01f4d18SPeter Hurley uport->hw_stopped = 0; 1366ab4382d2SGreg Kroah-Hartman __uart_start(tty); 1367938f7e13SPeter Hurley spin_unlock_irq(&uport->lock); 1368ab4382d2SGreg Kroah-Hartman } 1369ab4382d2SGreg Kroah-Hartman /* Handle turning on CRTSCTS */ 1370ab4382d2SGreg Kroah-Hartman else if (!(old_termios->c_cflag & CRTSCTS) && (cflag & CRTSCTS)) { 1371938f7e13SPeter Hurley spin_lock_irq(&uport->lock); 1372dec94e70SRussell King if (!(uport->ops->get_mctrl(uport) & TIOCM_CTS)) { 1373d01f4d18SPeter Hurley uport->hw_stopped = 1; 1374dec94e70SRussell King uport->ops->stop_tx(uport); 1375ab4382d2SGreg Kroah-Hartman } 1376938f7e13SPeter Hurley spin_unlock_irq(&uport->lock); 1377ab4382d2SGreg Kroah-Hartman } 1378ab4382d2SGreg Kroah-Hartman } 1379ab4382d2SGreg Kroah-Hartman 1380ab4382d2SGreg Kroah-Hartman /* 1381ef4f527cSKevin Cernekee * Calls to uart_close() are serialised via the tty_lock in 1382ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:tty_release() 1383ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:do_tty_hangup() 1384ef4f527cSKevin Cernekee * This runs from a workqueue and can sleep for a _short_ time only. 1385ab4382d2SGreg Kroah-Hartman */ 1386ab4382d2SGreg Kroah-Hartman static void uart_close(struct tty_struct *tty, struct file *filp) 1387ab4382d2SGreg Kroah-Hartman { 1388ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1389ab4382d2SGreg Kroah-Hartman struct tty_port *port; 1390ab4382d2SGreg Kroah-Hartman struct uart_port *uport; 1391ab4382d2SGreg Kroah-Hartman unsigned long flags; 1392ab4382d2SGreg Kroah-Hartman 139391b32f54SPeter Hurley if (!state) { 139491b32f54SPeter Hurley struct uart_driver *drv = tty->driver->driver_state; 139591b32f54SPeter Hurley 139691b32f54SPeter Hurley state = drv->state + tty->index; 139791b32f54SPeter Hurley port = &state->port; 139891b32f54SPeter Hurley spin_lock_irq(&port->lock); 139991b32f54SPeter Hurley --port->count; 140091b32f54SPeter Hurley spin_unlock_irq(&port->lock); 1401ab4382d2SGreg Kroah-Hartman return; 140291b32f54SPeter Hurley } 1403ab4382d2SGreg Kroah-Hartman 1404ab4382d2SGreg Kroah-Hartman uport = state->uart_port; 1405ab4382d2SGreg Kroah-Hartman port = &state->port; 1406ab4382d2SGreg Kroah-Hartman 14074ed94cd4SGeert Uytterhoeven pr_debug("uart_close(%d) called\n", uport ? uport->line : -1); 1408ab4382d2SGreg Kroah-Hartman 14094ed94cd4SGeert Uytterhoeven if (!port->count || tty_port_close_start(port, tty, filp) == 0) 141055956216SNobuhiro Iwamatsu return; 1411ab4382d2SGreg Kroah-Hartman 1412ab4382d2SGreg Kroah-Hartman /* 1413ab4382d2SGreg Kroah-Hartman * At this point, we stop accepting input. To do this, we 1414ab4382d2SGreg Kroah-Hartman * disable the receive line status interrupts. 1415ab4382d2SGreg Kroah-Hartman */ 1416ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_INITIALIZED) { 1417ab4382d2SGreg Kroah-Hartman unsigned long flags; 1418ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&uport->lock, flags); 1419ab4382d2SGreg Kroah-Hartman uport->ops->stop_rx(uport); 1420ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&uport->lock, flags); 1421ab4382d2SGreg Kroah-Hartman /* 1422ab4382d2SGreg Kroah-Hartman * Before we drop DTR, make sure the UART transmitter 1423ab4382d2SGreg Kroah-Hartman * has completely drained; this is especially 1424ab4382d2SGreg Kroah-Hartman * important if there is a transmit FIFO! 1425ab4382d2SGreg Kroah-Hartman */ 14261f33a51dSJiri Slaby uart_wait_until_sent(tty, uport->timeout); 1427ab4382d2SGreg Kroah-Hartman } 1428ab4382d2SGreg Kroah-Hartman 1429bafb0bd2SJiri Slaby mutex_lock(&port->mutex); 1430ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 1431ab4382d2SGreg Kroah-Hartman tty_port_tty_set(port, NULL); 1432ab4382d2SGreg Kroah-Hartman tty->closing = 0; 1433ddc7b758SPeter Hurley spin_lock_irqsave(&port->lock, flags); 1434ab4382d2SGreg Kroah-Hartman 1435ab4382d2SGreg Kroah-Hartman if (port->blocked_open) { 1436ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 1437ab4382d2SGreg Kroah-Hartman if (port->close_delay) 143874866e75SPeter Hurley msleep_interruptible(jiffies_to_msecs(port->close_delay)); 1439ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 1440ab4382d2SGreg Kroah-Hartman } else if (!uart_console(uport)) { 1441ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 14426f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_OFF); 1443ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 1444ab4382d2SGreg Kroah-Hartman } 1445ab4382d2SGreg Kroah-Hartman 1446ab4382d2SGreg Kroah-Hartman /* 1447ab4382d2SGreg Kroah-Hartman * Wake up anyone trying to open this port. 1448ab4382d2SGreg Kroah-Hartman */ 1449ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); 1450426929f8SJiri Slaby clear_bit(ASYNCB_CLOSING, &port->flags); 1451ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 1452ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->open_wait); 1453426929f8SJiri Slaby wake_up_interruptible(&port->close_wait); 1454ab4382d2SGreg Kroah-Hartman 1455ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 14562e758910SPeter Hurley 14572e758910SPeter Hurley tty_ldisc_flush(tty); 1458ab4382d2SGreg Kroah-Hartman } 1459ab4382d2SGreg Kroah-Hartman 14601f33a51dSJiri Slaby static void uart_wait_until_sent(struct tty_struct *tty, int timeout) 1461ab4382d2SGreg Kroah-Hartman { 14621f33a51dSJiri Slaby struct uart_state *state = tty->driver_data; 14631f33a51dSJiri Slaby struct uart_port *port = state->uart_port; 1464ab4382d2SGreg Kroah-Hartman unsigned long char_time, expire; 1465ab4382d2SGreg Kroah-Hartman 1466ab4382d2SGreg Kroah-Hartman if (port->type == PORT_UNKNOWN || port->fifosize == 0) 1467ab4382d2SGreg Kroah-Hartman return; 1468ab4382d2SGreg Kroah-Hartman 1469ab4382d2SGreg Kroah-Hartman /* 1470ab4382d2SGreg Kroah-Hartman * Set the check interval to be 1/5 of the estimated time to 1471ab4382d2SGreg Kroah-Hartman * send a single character, and make it at least 1. The check 1472ab4382d2SGreg Kroah-Hartman * interval should also be less than the timeout. 1473ab4382d2SGreg Kroah-Hartman * 1474ab4382d2SGreg Kroah-Hartman * Note: we have to use pretty tight timings here to satisfy 1475ab4382d2SGreg Kroah-Hartman * the NIST-PCTS. 1476ab4382d2SGreg Kroah-Hartman */ 1477ab4382d2SGreg Kroah-Hartman char_time = (port->timeout - HZ/50) / port->fifosize; 1478ab4382d2SGreg Kroah-Hartman char_time = char_time / 5; 1479ab4382d2SGreg Kroah-Hartman if (char_time == 0) 1480ab4382d2SGreg Kroah-Hartman char_time = 1; 1481ab4382d2SGreg Kroah-Hartman if (timeout && timeout < char_time) 1482ab4382d2SGreg Kroah-Hartman char_time = timeout; 1483ab4382d2SGreg Kroah-Hartman 1484ab4382d2SGreg Kroah-Hartman /* 1485ab4382d2SGreg Kroah-Hartman * If the transmitter hasn't cleared in twice the approximate 1486ab4382d2SGreg Kroah-Hartman * amount of time to send the entire FIFO, it probably won't 1487ab4382d2SGreg Kroah-Hartman * ever clear. This assumes the UART isn't doing flow 1488ab4382d2SGreg Kroah-Hartman * control, which is currently the case. Hence, if it ever 1489ab4382d2SGreg Kroah-Hartman * takes longer than port->timeout, this is probably due to a 1490ab4382d2SGreg Kroah-Hartman * UART bug of some kind. So, we clamp the timeout parameter at 1491ab4382d2SGreg Kroah-Hartman * 2*port->timeout. 1492ab4382d2SGreg Kroah-Hartman */ 1493ab4382d2SGreg Kroah-Hartman if (timeout == 0 || timeout > 2 * port->timeout) 1494ab4382d2SGreg Kroah-Hartman timeout = 2 * port->timeout; 1495ab4382d2SGreg Kroah-Hartman 1496ab4382d2SGreg Kroah-Hartman expire = jiffies + timeout; 1497ab4382d2SGreg Kroah-Hartman 1498ab4382d2SGreg Kroah-Hartman pr_debug("uart_wait_until_sent(%d), jiffies=%lu, expire=%lu...\n", 1499ab4382d2SGreg Kroah-Hartman port->line, jiffies, expire); 1500ab4382d2SGreg Kroah-Hartman 1501ab4382d2SGreg Kroah-Hartman /* 1502ab4382d2SGreg Kroah-Hartman * Check whether the transmitter is empty every 'char_time'. 1503ab4382d2SGreg Kroah-Hartman * 'timeout' / 'expire' give us the maximum amount of time 1504ab4382d2SGreg Kroah-Hartman * we wait. 1505ab4382d2SGreg Kroah-Hartman */ 1506ab4382d2SGreg Kroah-Hartman while (!port->ops->tx_empty(port)) { 1507ab4382d2SGreg Kroah-Hartman msleep_interruptible(jiffies_to_msecs(char_time)); 1508ab4382d2SGreg Kroah-Hartman if (signal_pending(current)) 1509ab4382d2SGreg Kroah-Hartman break; 1510ab4382d2SGreg Kroah-Hartman if (time_after(jiffies, expire)) 1511ab4382d2SGreg Kroah-Hartman break; 1512ab4382d2SGreg Kroah-Hartman } 1513ab4382d2SGreg Kroah-Hartman } 1514ab4382d2SGreg Kroah-Hartman 1515ab4382d2SGreg Kroah-Hartman /* 1516ef4f527cSKevin Cernekee * Calls to uart_hangup() are serialised by the tty_lock in 1517ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:do_tty_hangup() 1518ef4f527cSKevin Cernekee * This runs from a workqueue and can sleep for a _short_ time only. 1519ab4382d2SGreg Kroah-Hartman */ 1520ab4382d2SGreg Kroah-Hartman static void uart_hangup(struct tty_struct *tty) 1521ab4382d2SGreg Kroah-Hartman { 1522ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1523ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1524ab4382d2SGreg Kroah-Hartman unsigned long flags; 1525ab4382d2SGreg Kroah-Hartman 1526ab4382d2SGreg Kroah-Hartman pr_debug("uart_hangup(%d)\n", state->uart_port->line); 1527ab4382d2SGreg Kroah-Hartman 1528ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1529ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_NORMAL_ACTIVE) { 1530ab4382d2SGreg Kroah-Hartman uart_flush_buffer(tty); 1531ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 1532ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 1533ab4382d2SGreg Kroah-Hartman port->count = 0; 1534ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); 1535ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 1536ab4382d2SGreg Kroah-Hartman tty_port_tty_set(port, NULL); 1537bf903c0cSGeert Uytterhoeven if (!uart_console(state->uart_port)) 1538bf903c0cSGeert Uytterhoeven uart_change_pm(state, UART_PM_STATE_OFF); 1539ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->open_wait); 1540ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->delta_msr_wait); 1541ab4382d2SGreg Kroah-Hartman } 1542ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1543ab4382d2SGreg Kroah-Hartman } 1544ab4382d2SGreg Kroah-Hartman 15450b1db830SJiri Slaby static int uart_port_activate(struct tty_port *port, struct tty_struct *tty) 15460b1db830SJiri Slaby { 15470b1db830SJiri Slaby return 0; 15480b1db830SJiri Slaby } 15490b1db830SJiri Slaby 15500b1db830SJiri Slaby static void uart_port_shutdown(struct tty_port *port) 15510b1db830SJiri Slaby { 1552b922e19dSJiri Slaby struct uart_state *state = container_of(port, struct uart_state, port); 1553b922e19dSJiri Slaby struct uart_port *uport = state->uart_port; 1554b922e19dSJiri Slaby 1555b922e19dSJiri Slaby /* 1556b922e19dSJiri Slaby * clear delta_msr_wait queue to avoid mem leaks: we may free 1557b922e19dSJiri Slaby * the irq here so the queue might never be woken up. Note 1558b922e19dSJiri Slaby * that we won't end up waiting on delta_msr_wait again since 1559b922e19dSJiri Slaby * any outstanding file descriptors should be pointing at 1560b922e19dSJiri Slaby * hung_up_tty_fops now. 1561b922e19dSJiri Slaby */ 1562b922e19dSJiri Slaby wake_up_interruptible(&port->delta_msr_wait); 1563b922e19dSJiri Slaby 1564b922e19dSJiri Slaby /* 1565b922e19dSJiri Slaby * Free the IRQ and disable the port. 1566b922e19dSJiri Slaby */ 1567b922e19dSJiri Slaby uport->ops->shutdown(uport); 1568b922e19dSJiri Slaby 1569b922e19dSJiri Slaby /* 1570b922e19dSJiri Slaby * Ensure that the IRQ handler isn't running on another CPU. 1571b922e19dSJiri Slaby */ 1572b922e19dSJiri Slaby synchronize_irq(uport->irq); 15730b1db830SJiri Slaby } 15740b1db830SJiri Slaby 1575ab4382d2SGreg Kroah-Hartman static int uart_carrier_raised(struct tty_port *port) 1576ab4382d2SGreg Kroah-Hartman { 1577ab4382d2SGreg Kroah-Hartman struct uart_state *state = container_of(port, struct uart_state, port); 1578ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1579ab4382d2SGreg Kroah-Hartman int mctrl; 1580ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 15811fdc3106SAlexander Shiyan uart_enable_ms(uport); 1582ab4382d2SGreg Kroah-Hartman mctrl = uport->ops->get_mctrl(uport); 1583ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1584ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_CAR) 1585ab4382d2SGreg Kroah-Hartman return 1; 1586ab4382d2SGreg Kroah-Hartman return 0; 1587ab4382d2SGreg Kroah-Hartman } 1588ab4382d2SGreg Kroah-Hartman 1589ab4382d2SGreg Kroah-Hartman static void uart_dtr_rts(struct tty_port *port, int onoff) 1590ab4382d2SGreg Kroah-Hartman { 1591ab4382d2SGreg Kroah-Hartman struct uart_state *state = container_of(port, struct uart_state, port); 1592ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1593ab4382d2SGreg Kroah-Hartman 15946f5c24adSJiri Slaby if (onoff) 1595ab4382d2SGreg Kroah-Hartman uart_set_mctrl(uport, TIOCM_DTR | TIOCM_RTS); 1596ab4382d2SGreg Kroah-Hartman else 1597ab4382d2SGreg Kroah-Hartman uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); 1598ab4382d2SGreg Kroah-Hartman } 1599ab4382d2SGreg Kroah-Hartman 1600ab4382d2SGreg Kroah-Hartman /* 1601ef4f527cSKevin Cernekee * Calls to uart_open are serialised by the tty_lock in 1602ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:tty_open() 1603ab4382d2SGreg Kroah-Hartman * Note that if this fails, then uart_close() _will_ be called. 1604ab4382d2SGreg Kroah-Hartman * 1605ab4382d2SGreg Kroah-Hartman * In time, we want to scrap the "opening nonpresent ports" 1606ab4382d2SGreg Kroah-Hartman * behaviour and implement an alternative way for setserial 1607ab4382d2SGreg Kroah-Hartman * to set base addresses/ports/types. This will allow us to 1608ab4382d2SGreg Kroah-Hartman * get rid of a certain amount of extra tests. 1609ab4382d2SGreg Kroah-Hartman */ 1610ab4382d2SGreg Kroah-Hartman static int uart_open(struct tty_struct *tty, struct file *filp) 1611ab4382d2SGreg Kroah-Hartman { 1612ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = (struct uart_driver *)tty->driver->driver_state; 1613ab4382d2SGreg Kroah-Hartman int retval, line = tty->index; 16141c7b13c4SJiri Slaby struct uart_state *state = drv->state + line; 16151c7b13c4SJiri Slaby struct tty_port *port = &state->port; 1616ab4382d2SGreg Kroah-Hartman 1617ab4382d2SGreg Kroah-Hartman pr_debug("uart_open(%d) called\n", line); 1618ab4382d2SGreg Kroah-Hartman 161991b32f54SPeter Hurley spin_lock_irq(&port->lock); 162091b32f54SPeter Hurley ++port->count; 162191b32f54SPeter Hurley spin_unlock_irq(&port->lock); 162291b32f54SPeter Hurley 1623ab4382d2SGreg Kroah-Hartman /* 16241c7b13c4SJiri Slaby * We take the semaphore here to guarantee that we won't be re-entered 16251c7b13c4SJiri Slaby * while allocating the state structure, or while we request any IRQs 16261c7b13c4SJiri Slaby * that the driver may need. This also has the nice side-effect that 16271c7b13c4SJiri Slaby * it delays the action of uart_hangup, so we can guarantee that 16281c7b13c4SJiri Slaby * state->port.tty will always contain something reasonable. 1629ab4382d2SGreg Kroah-Hartman */ 16301c7b13c4SJiri Slaby if (mutex_lock_interruptible(&port->mutex)) { 16311c7b13c4SJiri Slaby retval = -ERESTARTSYS; 16321c7b13c4SJiri Slaby goto end; 1633ab4382d2SGreg Kroah-Hartman } 16341c7b13c4SJiri Slaby 16351c7b13c4SJiri Slaby if (!state->uart_port || state->uart_port->flags & UPF_DEAD) { 16361c7b13c4SJiri Slaby retval = -ENXIO; 163791b32f54SPeter Hurley goto err_unlock; 16381c7b13c4SJiri Slaby } 1639ab4382d2SGreg Kroah-Hartman 1640ab4382d2SGreg Kroah-Hartman tty->driver_data = state; 1641ab4382d2SGreg Kroah-Hartman state->uart_port->state = state; 1642d6c53c0eSJiri Slaby state->port.low_latency = 1643d6c53c0eSJiri Slaby (state->uart_port->flags & UPF_LOW_LATENCY) ? 1 : 0; 1644ab4382d2SGreg Kroah-Hartman tty_port_tty_set(port, tty); 1645ab4382d2SGreg Kroah-Hartman 1646ab4382d2SGreg Kroah-Hartman /* 1647ab4382d2SGreg Kroah-Hartman * Start up the serial port. 1648ab4382d2SGreg Kroah-Hartman */ 1649ab4382d2SGreg Kroah-Hartman retval = uart_startup(tty, state, 0); 1650ab4382d2SGreg Kroah-Hartman 1651ab4382d2SGreg Kroah-Hartman /* 1652ab4382d2SGreg Kroah-Hartman * If we succeeded, wait until the port is ready. 1653ab4382d2SGreg Kroah-Hartman */ 1654ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1655ab4382d2SGreg Kroah-Hartman if (retval == 0) 1656ab4382d2SGreg Kroah-Hartman retval = tty_port_block_til_ready(port, tty, filp); 1657ab4382d2SGreg Kroah-Hartman 16581c7b13c4SJiri Slaby end: 1659ab4382d2SGreg Kroah-Hartman return retval; 166091b32f54SPeter Hurley err_unlock: 16611c7b13c4SJiri Slaby mutex_unlock(&port->mutex); 16621c7b13c4SJiri Slaby goto end; 1663ab4382d2SGreg Kroah-Hartman } 1664ab4382d2SGreg Kroah-Hartman 1665ab4382d2SGreg Kroah-Hartman static const char *uart_type(struct uart_port *port) 1666ab4382d2SGreg Kroah-Hartman { 1667ab4382d2SGreg Kroah-Hartman const char *str = NULL; 1668ab4382d2SGreg Kroah-Hartman 1669ab4382d2SGreg Kroah-Hartman if (port->ops->type) 1670ab4382d2SGreg Kroah-Hartman str = port->ops->type(port); 1671ab4382d2SGreg Kroah-Hartman 1672ab4382d2SGreg Kroah-Hartman if (!str) 1673ab4382d2SGreg Kroah-Hartman str = "unknown"; 1674ab4382d2SGreg Kroah-Hartman 1675ab4382d2SGreg Kroah-Hartman return str; 1676ab4382d2SGreg Kroah-Hartman } 1677ab4382d2SGreg Kroah-Hartman 1678ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_PROC_FS 1679ab4382d2SGreg Kroah-Hartman 1680ab4382d2SGreg Kroah-Hartman static void uart_line_info(struct seq_file *m, struct uart_driver *drv, int i) 1681ab4382d2SGreg Kroah-Hartman { 1682ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + i; 1683ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 16846f538fe3SLinus Walleij enum uart_pm_state pm_state; 1685ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1686ab4382d2SGreg Kroah-Hartman char stat_buf[32]; 1687ab4382d2SGreg Kroah-Hartman unsigned int status; 1688ab4382d2SGreg Kroah-Hartman int mmio; 1689ab4382d2SGreg Kroah-Hartman 1690ab4382d2SGreg Kroah-Hartman if (!uport) 1691ab4382d2SGreg Kroah-Hartman return; 1692ab4382d2SGreg Kroah-Hartman 1693ab4382d2SGreg Kroah-Hartman mmio = uport->iotype >= UPIO_MEM; 1694ab4382d2SGreg Kroah-Hartman seq_printf(m, "%d: uart:%s %s%08llX irq:%d", 1695ab4382d2SGreg Kroah-Hartman uport->line, uart_type(uport), 1696ab4382d2SGreg Kroah-Hartman mmio ? "mmio:0x" : "port:", 1697ab4382d2SGreg Kroah-Hartman mmio ? (unsigned long long)uport->mapbase 1698ab4382d2SGreg Kroah-Hartman : (unsigned long long)uport->iobase, 1699ab4382d2SGreg Kroah-Hartman uport->irq); 1700ab4382d2SGreg Kroah-Hartman 1701ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) { 1702ab4382d2SGreg Kroah-Hartman seq_putc(m, '\n'); 1703ab4382d2SGreg Kroah-Hartman return; 1704ab4382d2SGreg Kroah-Hartman } 1705ab4382d2SGreg Kroah-Hartman 1706ab4382d2SGreg Kroah-Hartman if (capable(CAP_SYS_ADMIN)) { 1707ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1708ab4382d2SGreg Kroah-Hartman pm_state = state->pm_state; 17096f538fe3SLinus Walleij if (pm_state != UART_PM_STATE_ON) 17106f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 1711ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1712ab4382d2SGreg Kroah-Hartman status = uport->ops->get_mctrl(uport); 1713ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 17146f538fe3SLinus Walleij if (pm_state != UART_PM_STATE_ON) 1715ab4382d2SGreg Kroah-Hartman uart_change_pm(state, pm_state); 1716ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1717ab4382d2SGreg Kroah-Hartman 1718ab4382d2SGreg Kroah-Hartman seq_printf(m, " tx:%d rx:%d", 1719ab4382d2SGreg Kroah-Hartman uport->icount.tx, uport->icount.rx); 1720ab4382d2SGreg Kroah-Hartman if (uport->icount.frame) 1721ab4382d2SGreg Kroah-Hartman seq_printf(m, " fe:%d", 1722ab4382d2SGreg Kroah-Hartman uport->icount.frame); 1723ab4382d2SGreg Kroah-Hartman if (uport->icount.parity) 1724ab4382d2SGreg Kroah-Hartman seq_printf(m, " pe:%d", 1725ab4382d2SGreg Kroah-Hartman uport->icount.parity); 1726ab4382d2SGreg Kroah-Hartman if (uport->icount.brk) 1727ab4382d2SGreg Kroah-Hartman seq_printf(m, " brk:%d", 1728ab4382d2SGreg Kroah-Hartman uport->icount.brk); 1729ab4382d2SGreg Kroah-Hartman if (uport->icount.overrun) 1730ab4382d2SGreg Kroah-Hartman seq_printf(m, " oe:%d", 1731ab4382d2SGreg Kroah-Hartman uport->icount.overrun); 1732ab4382d2SGreg Kroah-Hartman 1733ab4382d2SGreg Kroah-Hartman #define INFOBIT(bit, str) \ 1734ab4382d2SGreg Kroah-Hartman if (uport->mctrl & (bit)) \ 1735ab4382d2SGreg Kroah-Hartman strncat(stat_buf, (str), sizeof(stat_buf) - \ 1736ab4382d2SGreg Kroah-Hartman strlen(stat_buf) - 2) 1737ab4382d2SGreg Kroah-Hartman #define STATBIT(bit, str) \ 1738ab4382d2SGreg Kroah-Hartman if (status & (bit)) \ 1739ab4382d2SGreg Kroah-Hartman strncat(stat_buf, (str), sizeof(stat_buf) - \ 1740ab4382d2SGreg Kroah-Hartman strlen(stat_buf) - 2) 1741ab4382d2SGreg Kroah-Hartman 1742ab4382d2SGreg Kroah-Hartman stat_buf[0] = '\0'; 1743ab4382d2SGreg Kroah-Hartman stat_buf[1] = '\0'; 1744ab4382d2SGreg Kroah-Hartman INFOBIT(TIOCM_RTS, "|RTS"); 1745ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_CTS, "|CTS"); 1746ab4382d2SGreg Kroah-Hartman INFOBIT(TIOCM_DTR, "|DTR"); 1747ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_DSR, "|DSR"); 1748ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_CAR, "|CD"); 1749ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_RNG, "|RI"); 1750ab4382d2SGreg Kroah-Hartman if (stat_buf[0]) 1751ab4382d2SGreg Kroah-Hartman stat_buf[0] = ' '; 1752ab4382d2SGreg Kroah-Hartman 1753ab4382d2SGreg Kroah-Hartman seq_puts(m, stat_buf); 1754ab4382d2SGreg Kroah-Hartman } 1755ab4382d2SGreg Kroah-Hartman seq_putc(m, '\n'); 1756ab4382d2SGreg Kroah-Hartman #undef STATBIT 1757ab4382d2SGreg Kroah-Hartman #undef INFOBIT 1758ab4382d2SGreg Kroah-Hartman } 1759ab4382d2SGreg Kroah-Hartman 1760ab4382d2SGreg Kroah-Hartman static int uart_proc_show(struct seq_file *m, void *v) 1761ab4382d2SGreg Kroah-Hartman { 1762ab4382d2SGreg Kroah-Hartman struct tty_driver *ttydrv = m->private; 1763ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = ttydrv->driver_state; 1764ab4382d2SGreg Kroah-Hartman int i; 1765ab4382d2SGreg Kroah-Hartman 1766ab4382d2SGreg Kroah-Hartman seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n", 1767ab4382d2SGreg Kroah-Hartman "", "", ""); 1768ab4382d2SGreg Kroah-Hartman for (i = 0; i < drv->nr; i++) 1769ab4382d2SGreg Kroah-Hartman uart_line_info(m, drv, i); 1770ab4382d2SGreg Kroah-Hartman return 0; 1771ab4382d2SGreg Kroah-Hartman } 1772ab4382d2SGreg Kroah-Hartman 1773ab4382d2SGreg Kroah-Hartman static int uart_proc_open(struct inode *inode, struct file *file) 1774ab4382d2SGreg Kroah-Hartman { 1775d9dda78bSAl Viro return single_open(file, uart_proc_show, PDE_DATA(inode)); 1776ab4382d2SGreg Kroah-Hartman } 1777ab4382d2SGreg Kroah-Hartman 1778ab4382d2SGreg Kroah-Hartman static const struct file_operations uart_proc_fops = { 1779ab4382d2SGreg Kroah-Hartman .owner = THIS_MODULE, 1780ab4382d2SGreg Kroah-Hartman .open = uart_proc_open, 1781ab4382d2SGreg Kroah-Hartman .read = seq_read, 1782ab4382d2SGreg Kroah-Hartman .llseek = seq_lseek, 1783ab4382d2SGreg Kroah-Hartman .release = single_release, 1784ab4382d2SGreg Kroah-Hartman }; 1785ab4382d2SGreg Kroah-Hartman #endif 1786ab4382d2SGreg Kroah-Hartman 1787ab4382d2SGreg Kroah-Hartman #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL) 1788ab4382d2SGreg Kroah-Hartman /* 1789ab4382d2SGreg Kroah-Hartman * uart_console_write - write a console message to a serial port 1790ab4382d2SGreg Kroah-Hartman * @port: the port to write the message 1791ab4382d2SGreg Kroah-Hartman * @s: array of characters 1792ab4382d2SGreg Kroah-Hartman * @count: number of characters in string to write 1793ab4382d2SGreg Kroah-Hartman * @write: function to write character to port 1794ab4382d2SGreg Kroah-Hartman */ 1795ab4382d2SGreg Kroah-Hartman void uart_console_write(struct uart_port *port, const char *s, 1796ab4382d2SGreg Kroah-Hartman unsigned int count, 1797ab4382d2SGreg Kroah-Hartman void (*putchar)(struct uart_port *, int)) 1798ab4382d2SGreg Kroah-Hartman { 1799ab4382d2SGreg Kroah-Hartman unsigned int i; 1800ab4382d2SGreg Kroah-Hartman 1801ab4382d2SGreg Kroah-Hartman for (i = 0; i < count; i++, s++) { 1802ab4382d2SGreg Kroah-Hartman if (*s == '\n') 1803ab4382d2SGreg Kroah-Hartman putchar(port, '\r'); 1804ab4382d2SGreg Kroah-Hartman putchar(port, *s); 1805ab4382d2SGreg Kroah-Hartman } 1806ab4382d2SGreg Kroah-Hartman } 1807ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_console_write); 1808ab4382d2SGreg Kroah-Hartman 1809ab4382d2SGreg Kroah-Hartman /* 1810ab4382d2SGreg Kroah-Hartman * Check whether an invalid uart number has been specified, and 1811ab4382d2SGreg Kroah-Hartman * if so, search for the first available port that does have 1812ab4382d2SGreg Kroah-Hartman * console support. 1813ab4382d2SGreg Kroah-Hartman */ 1814ab4382d2SGreg Kroah-Hartman struct uart_port * __init 1815ab4382d2SGreg Kroah-Hartman uart_get_console(struct uart_port *ports, int nr, struct console *co) 1816ab4382d2SGreg Kroah-Hartman { 1817ab4382d2SGreg Kroah-Hartman int idx = co->index; 1818ab4382d2SGreg Kroah-Hartman 1819ab4382d2SGreg Kroah-Hartman if (idx < 0 || idx >= nr || (ports[idx].iobase == 0 && 1820ab4382d2SGreg Kroah-Hartman ports[idx].membase == NULL)) 1821ab4382d2SGreg Kroah-Hartman for (idx = 0; idx < nr; idx++) 1822ab4382d2SGreg Kroah-Hartman if (ports[idx].iobase != 0 || 1823ab4382d2SGreg Kroah-Hartman ports[idx].membase != NULL) 1824ab4382d2SGreg Kroah-Hartman break; 1825ab4382d2SGreg Kroah-Hartman 1826ab4382d2SGreg Kroah-Hartman co->index = idx; 1827ab4382d2SGreg Kroah-Hartman 1828ab4382d2SGreg Kroah-Hartman return ports + idx; 1829ab4382d2SGreg Kroah-Hartman } 1830ab4382d2SGreg Kroah-Hartman 1831ab4382d2SGreg Kroah-Hartman /** 183202088ca6SGeert Uytterhoeven * uart_parse_options - Parse serial port baud/parity/bits/flow control. 1833ab4382d2SGreg Kroah-Hartman * @options: pointer to option string 1834ab4382d2SGreg Kroah-Hartman * @baud: pointer to an 'int' variable for the baud rate. 1835ab4382d2SGreg Kroah-Hartman * @parity: pointer to an 'int' variable for the parity. 1836ab4382d2SGreg Kroah-Hartman * @bits: pointer to an 'int' variable for the number of data bits. 1837ab4382d2SGreg Kroah-Hartman * @flow: pointer to an 'int' variable for the flow control character. 1838ab4382d2SGreg Kroah-Hartman * 1839ab4382d2SGreg Kroah-Hartman * uart_parse_options decodes a string containing the serial console 1840ab4382d2SGreg Kroah-Hartman * options. The format of the string is <baud><parity><bits><flow>, 1841ab4382d2SGreg Kroah-Hartman * eg: 115200n8r 1842ab4382d2SGreg Kroah-Hartman */ 1843ab4382d2SGreg Kroah-Hartman void 1844ab4382d2SGreg Kroah-Hartman uart_parse_options(char *options, int *baud, int *parity, int *bits, int *flow) 1845ab4382d2SGreg Kroah-Hartman { 1846ab4382d2SGreg Kroah-Hartman char *s = options; 1847ab4382d2SGreg Kroah-Hartman 1848ab4382d2SGreg Kroah-Hartman *baud = simple_strtoul(s, NULL, 10); 1849ab4382d2SGreg Kroah-Hartman while (*s >= '0' && *s <= '9') 1850ab4382d2SGreg Kroah-Hartman s++; 1851ab4382d2SGreg Kroah-Hartman if (*s) 1852ab4382d2SGreg Kroah-Hartman *parity = *s++; 1853ab4382d2SGreg Kroah-Hartman if (*s) 1854ab4382d2SGreg Kroah-Hartman *bits = *s++ - '0'; 1855ab4382d2SGreg Kroah-Hartman if (*s) 1856ab4382d2SGreg Kroah-Hartman *flow = *s; 1857ab4382d2SGreg Kroah-Hartman } 1858ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_parse_options); 1859ab4382d2SGreg Kroah-Hartman 1860ab4382d2SGreg Kroah-Hartman struct baud_rates { 1861ab4382d2SGreg Kroah-Hartman unsigned int rate; 1862ab4382d2SGreg Kroah-Hartman unsigned int cflag; 1863ab4382d2SGreg Kroah-Hartman }; 1864ab4382d2SGreg Kroah-Hartman 1865ab4382d2SGreg Kroah-Hartman static const struct baud_rates baud_rates[] = { 1866ab4382d2SGreg Kroah-Hartman { 921600, B921600 }, 1867ab4382d2SGreg Kroah-Hartman { 460800, B460800 }, 1868ab4382d2SGreg Kroah-Hartman { 230400, B230400 }, 1869ab4382d2SGreg Kroah-Hartman { 115200, B115200 }, 1870ab4382d2SGreg Kroah-Hartman { 57600, B57600 }, 1871ab4382d2SGreg Kroah-Hartman { 38400, B38400 }, 1872ab4382d2SGreg Kroah-Hartman { 19200, B19200 }, 1873ab4382d2SGreg Kroah-Hartman { 9600, B9600 }, 1874ab4382d2SGreg Kroah-Hartman { 4800, B4800 }, 1875ab4382d2SGreg Kroah-Hartman { 2400, B2400 }, 1876ab4382d2SGreg Kroah-Hartman { 1200, B1200 }, 1877ab4382d2SGreg Kroah-Hartman { 0, B38400 } 1878ab4382d2SGreg Kroah-Hartman }; 1879ab4382d2SGreg Kroah-Hartman 1880ab4382d2SGreg Kroah-Hartman /** 1881ab4382d2SGreg Kroah-Hartman * uart_set_options - setup the serial console parameters 1882ab4382d2SGreg Kroah-Hartman * @port: pointer to the serial ports uart_port structure 1883ab4382d2SGreg Kroah-Hartman * @co: console pointer 1884ab4382d2SGreg Kroah-Hartman * @baud: baud rate 1885ab4382d2SGreg Kroah-Hartman * @parity: parity character - 'n' (none), 'o' (odd), 'e' (even) 1886ab4382d2SGreg Kroah-Hartman * @bits: number of data bits 1887ab4382d2SGreg Kroah-Hartman * @flow: flow control character - 'r' (rts) 1888ab4382d2SGreg Kroah-Hartman */ 1889ab4382d2SGreg Kroah-Hartman int 1890ab4382d2SGreg Kroah-Hartman uart_set_options(struct uart_port *port, struct console *co, 1891ab4382d2SGreg Kroah-Hartman int baud, int parity, int bits, int flow) 1892ab4382d2SGreg Kroah-Hartman { 1893ab4382d2SGreg Kroah-Hartman struct ktermios termios; 1894ab4382d2SGreg Kroah-Hartman static struct ktermios dummy; 1895ab4382d2SGreg Kroah-Hartman int i; 1896ab4382d2SGreg Kroah-Hartman 1897ab4382d2SGreg Kroah-Hartman /* 1898ab4382d2SGreg Kroah-Hartman * Ensure that the serial console lock is initialised 1899ab4382d2SGreg Kroah-Hartman * early. 190042b6a1baSRandy Witt * If this port is a console, then the spinlock is already 190142b6a1baSRandy Witt * initialised. 1902ab4382d2SGreg Kroah-Hartman */ 190342b6a1baSRandy Witt if (!(uart_console(port) && (port->cons->flags & CON_ENABLED))) { 1904ab4382d2SGreg Kroah-Hartman spin_lock_init(&port->lock); 1905ab4382d2SGreg Kroah-Hartman lockdep_set_class(&port->lock, &port_lock_key); 190642b6a1baSRandy Witt } 1907ab4382d2SGreg Kroah-Hartman 1908ab4382d2SGreg Kroah-Hartman memset(&termios, 0, sizeof(struct ktermios)); 1909ab4382d2SGreg Kroah-Hartman 1910ab4382d2SGreg Kroah-Hartman termios.c_cflag = CREAD | HUPCL | CLOCAL; 1911ab4382d2SGreg Kroah-Hartman 1912ab4382d2SGreg Kroah-Hartman /* 1913ab4382d2SGreg Kroah-Hartman * Construct a cflag setting. 1914ab4382d2SGreg Kroah-Hartman */ 1915ab4382d2SGreg Kroah-Hartman for (i = 0; baud_rates[i].rate; i++) 1916ab4382d2SGreg Kroah-Hartman if (baud_rates[i].rate <= baud) 1917ab4382d2SGreg Kroah-Hartman break; 1918ab4382d2SGreg Kroah-Hartman 1919ab4382d2SGreg Kroah-Hartman termios.c_cflag |= baud_rates[i].cflag; 1920ab4382d2SGreg Kroah-Hartman 1921ab4382d2SGreg Kroah-Hartman if (bits == 7) 1922ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CS7; 1923ab4382d2SGreg Kroah-Hartman else 1924ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CS8; 1925ab4382d2SGreg Kroah-Hartman 1926ab4382d2SGreg Kroah-Hartman switch (parity) { 1927ab4382d2SGreg Kroah-Hartman case 'o': case 'O': 1928ab4382d2SGreg Kroah-Hartman termios.c_cflag |= PARODD; 1929ab4382d2SGreg Kroah-Hartman /*fall through*/ 1930ab4382d2SGreg Kroah-Hartman case 'e': case 'E': 1931ab4382d2SGreg Kroah-Hartman termios.c_cflag |= PARENB; 1932ab4382d2SGreg Kroah-Hartman break; 1933ab4382d2SGreg Kroah-Hartman } 1934ab4382d2SGreg Kroah-Hartman 1935ab4382d2SGreg Kroah-Hartman if (flow == 'r') 1936ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CRTSCTS; 1937ab4382d2SGreg Kroah-Hartman 1938ab4382d2SGreg Kroah-Hartman /* 1939ab4382d2SGreg Kroah-Hartman * some uarts on other side don't support no flow control. 1940ab4382d2SGreg Kroah-Hartman * So we set * DTR in host uart to make them happy 1941ab4382d2SGreg Kroah-Hartman */ 1942ab4382d2SGreg Kroah-Hartman port->mctrl |= TIOCM_DTR; 1943ab4382d2SGreg Kroah-Hartman 1944ab4382d2SGreg Kroah-Hartman port->ops->set_termios(port, &termios, &dummy); 1945ab4382d2SGreg Kroah-Hartman /* 1946ab4382d2SGreg Kroah-Hartman * Allow the setting of the UART parameters with a NULL console 1947ab4382d2SGreg Kroah-Hartman * too: 1948ab4382d2SGreg Kroah-Hartman */ 1949ab4382d2SGreg Kroah-Hartman if (co) 1950ab4382d2SGreg Kroah-Hartman co->cflag = termios.c_cflag; 1951ab4382d2SGreg Kroah-Hartman 1952ab4382d2SGreg Kroah-Hartman return 0; 1953ab4382d2SGreg Kroah-Hartman } 1954ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_set_options); 1955ab4382d2SGreg Kroah-Hartman #endif /* CONFIG_SERIAL_CORE_CONSOLE */ 1956ab4382d2SGreg Kroah-Hartman 1957cf75525fSJiri Slaby /** 1958cf75525fSJiri Slaby * uart_change_pm - set power state of the port 1959cf75525fSJiri Slaby * 1960cf75525fSJiri Slaby * @state: port descriptor 1961cf75525fSJiri Slaby * @pm_state: new state 1962cf75525fSJiri Slaby * 1963cf75525fSJiri Slaby * Locking: port->mutex has to be held 1964cf75525fSJiri Slaby */ 19656f538fe3SLinus Walleij static void uart_change_pm(struct uart_state *state, 19666f538fe3SLinus Walleij enum uart_pm_state pm_state) 1967ab4382d2SGreg Kroah-Hartman { 1968ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 1969ab4382d2SGreg Kroah-Hartman 1970ab4382d2SGreg Kroah-Hartman if (state->pm_state != pm_state) { 1971ab4382d2SGreg Kroah-Hartman if (port->ops->pm) 1972ab4382d2SGreg Kroah-Hartman port->ops->pm(port, pm_state, state->pm_state); 1973ab4382d2SGreg Kroah-Hartman state->pm_state = pm_state; 1974ab4382d2SGreg Kroah-Hartman } 1975ab4382d2SGreg Kroah-Hartman } 1976ab4382d2SGreg Kroah-Hartman 1977ab4382d2SGreg Kroah-Hartman struct uart_match { 1978ab4382d2SGreg Kroah-Hartman struct uart_port *port; 1979ab4382d2SGreg Kroah-Hartman struct uart_driver *driver; 1980ab4382d2SGreg Kroah-Hartman }; 1981ab4382d2SGreg Kroah-Hartman 1982ab4382d2SGreg Kroah-Hartman static int serial_match_port(struct device *dev, void *data) 1983ab4382d2SGreg Kroah-Hartman { 1984ab4382d2SGreg Kroah-Hartman struct uart_match *match = data; 1985ab4382d2SGreg Kroah-Hartman struct tty_driver *tty_drv = match->driver->tty_driver; 1986ab4382d2SGreg Kroah-Hartman dev_t devt = MKDEV(tty_drv->major, tty_drv->minor_start) + 1987ab4382d2SGreg Kroah-Hartman match->port->line; 1988ab4382d2SGreg Kroah-Hartman 1989ab4382d2SGreg Kroah-Hartman return dev->devt == devt; /* Actually, only one tty per port */ 1990ab4382d2SGreg Kroah-Hartman } 1991ab4382d2SGreg Kroah-Hartman 1992ab4382d2SGreg Kroah-Hartman int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport) 1993ab4382d2SGreg Kroah-Hartman { 1994ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 1995ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1996ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 1997ab4382d2SGreg Kroah-Hartman struct uart_match match = {uport, drv}; 1998ab4382d2SGreg Kroah-Hartman 1999ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2000ab4382d2SGreg Kroah-Hartman 2001ab4382d2SGreg Kroah-Hartman tty_dev = device_find_child(uport->dev, &match, serial_match_port); 2002ab4382d2SGreg Kroah-Hartman if (device_may_wakeup(tty_dev)) { 2003ab4382d2SGreg Kroah-Hartman if (!enable_irq_wake(uport->irq)) 2004ab4382d2SGreg Kroah-Hartman uport->irq_wake = 1; 2005ab4382d2SGreg Kroah-Hartman put_device(tty_dev); 2006ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2007ab4382d2SGreg Kroah-Hartman return 0; 2008ab4382d2SGreg Kroah-Hartman } 20095a65dcc0SFederico Vaga put_device(tty_dev); 20105a65dcc0SFederico Vaga 2011ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) 2012ab4382d2SGreg Kroah-Hartman uport->suspended = 1; 2013ab4382d2SGreg Kroah-Hartman 2014ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_INITIALIZED) { 2015ab4382d2SGreg Kroah-Hartman const struct uart_ops *ops = uport->ops; 2016ab4382d2SGreg Kroah-Hartman int tries; 2017ab4382d2SGreg Kroah-Hartman 2018ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) { 2019ab4382d2SGreg Kroah-Hartman set_bit(ASYNCB_SUSPENDED, &port->flags); 2020ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_INITIALIZED, &port->flags); 2021ab4382d2SGreg Kroah-Hartman 2022ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 2023ab4382d2SGreg Kroah-Hartman ops->stop_tx(uport); 2024ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, 0); 2025ab4382d2SGreg Kroah-Hartman ops->stop_rx(uport); 2026ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2027ab4382d2SGreg Kroah-Hartman } 2028ab4382d2SGreg Kroah-Hartman 2029ab4382d2SGreg Kroah-Hartman /* 2030ab4382d2SGreg Kroah-Hartman * Wait for the transmitter to empty. 2031ab4382d2SGreg Kroah-Hartman */ 2032ab4382d2SGreg Kroah-Hartman for (tries = 3; !ops->tx_empty(uport) && tries; tries--) 2033ab4382d2SGreg Kroah-Hartman msleep(10); 2034ab4382d2SGreg Kroah-Hartman if (!tries) 20352f2dafe7SSudip Mukherjee dev_err(uport->dev, "%s%d: Unable to drain transmitter\n", 2036ab4382d2SGreg Kroah-Hartman drv->dev_name, 2037ab4382d2SGreg Kroah-Hartman drv->tty_driver->name_base + uport->line); 2038ab4382d2SGreg Kroah-Hartman 2039ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) 2040ab4382d2SGreg Kroah-Hartman ops->shutdown(uport); 2041ab4382d2SGreg Kroah-Hartman } 2042ab4382d2SGreg Kroah-Hartman 2043ab4382d2SGreg Kroah-Hartman /* 2044ab4382d2SGreg Kroah-Hartman * Disable the console device before suspending. 2045ab4382d2SGreg Kroah-Hartman */ 2046ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled && uart_console(uport)) 2047ab4382d2SGreg Kroah-Hartman console_stop(uport->cons); 2048ab4382d2SGreg Kroah-Hartman 2049ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) 20506f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_OFF); 2051ab4382d2SGreg Kroah-Hartman 2052ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2053ab4382d2SGreg Kroah-Hartman 2054ab4382d2SGreg Kroah-Hartman return 0; 2055ab4382d2SGreg Kroah-Hartman } 2056ab4382d2SGreg Kroah-Hartman 2057ab4382d2SGreg Kroah-Hartman int uart_resume_port(struct uart_driver *drv, struct uart_port *uport) 2058ab4382d2SGreg Kroah-Hartman { 2059ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 2060ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2061ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 2062ab4382d2SGreg Kroah-Hartman struct uart_match match = {uport, drv}; 2063ab4382d2SGreg Kroah-Hartman struct ktermios termios; 2064ab4382d2SGreg Kroah-Hartman 2065ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2066ab4382d2SGreg Kroah-Hartman 2067ab4382d2SGreg Kroah-Hartman tty_dev = device_find_child(uport->dev, &match, serial_match_port); 2068ab4382d2SGreg Kroah-Hartman if (!uport->suspended && device_may_wakeup(tty_dev)) { 2069ab4382d2SGreg Kroah-Hartman if (uport->irq_wake) { 2070ab4382d2SGreg Kroah-Hartman disable_irq_wake(uport->irq); 2071ab4382d2SGreg Kroah-Hartman uport->irq_wake = 0; 2072ab4382d2SGreg Kroah-Hartman } 20735a65dcc0SFederico Vaga put_device(tty_dev); 2074ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2075ab4382d2SGreg Kroah-Hartman return 0; 2076ab4382d2SGreg Kroah-Hartman } 20775a65dcc0SFederico Vaga put_device(tty_dev); 2078ab4382d2SGreg Kroah-Hartman uport->suspended = 0; 2079ab4382d2SGreg Kroah-Hartman 2080ab4382d2SGreg Kroah-Hartman /* 2081ab4382d2SGreg Kroah-Hartman * Re-enable the console device after suspending. 2082ab4382d2SGreg Kroah-Hartman */ 20835933a161SYin Kangkai if (uart_console(uport)) { 2084ab4382d2SGreg Kroah-Hartman /* 2085ab4382d2SGreg Kroah-Hartman * First try to use the console cflag setting. 2086ab4382d2SGreg Kroah-Hartman */ 2087ab4382d2SGreg Kroah-Hartman memset(&termios, 0, sizeof(struct ktermios)); 2088ab4382d2SGreg Kroah-Hartman termios.c_cflag = uport->cons->cflag; 2089ab4382d2SGreg Kroah-Hartman 2090ab4382d2SGreg Kroah-Hartman /* 2091ab4382d2SGreg Kroah-Hartman * If that's unset, use the tty termios setting. 2092ab4382d2SGreg Kroah-Hartman */ 2093adc8d746SAlan Cox if (port->tty && termios.c_cflag == 0) 2094adc8d746SAlan Cox termios = port->tty->termios; 2095ab4382d2SGreg Kroah-Hartman 209694abc56fSNing Jiang if (console_suspend_enabled) 20976f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2098ab4382d2SGreg Kroah-Hartman uport->ops->set_termios(uport, &termios, NULL); 20995933a161SYin Kangkai if (console_suspend_enabled) 2100ab4382d2SGreg Kroah-Hartman console_start(uport->cons); 2101ab4382d2SGreg Kroah-Hartman } 2102ab4382d2SGreg Kroah-Hartman 2103ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_SUSPENDED) { 2104ab4382d2SGreg Kroah-Hartman const struct uart_ops *ops = uport->ops; 2105ab4382d2SGreg Kroah-Hartman int ret; 2106ab4382d2SGreg Kroah-Hartman 21076f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2108ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 2109ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, 0); 2110ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2111ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) { 2112ab4382d2SGreg Kroah-Hartman /* Protected by port mutex for now */ 2113ab4382d2SGreg Kroah-Hartman struct tty_struct *tty = port->tty; 2114ab4382d2SGreg Kroah-Hartman ret = ops->startup(uport); 2115ab4382d2SGreg Kroah-Hartman if (ret == 0) { 2116ab4382d2SGreg Kroah-Hartman if (tty) 2117ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 2118ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 2119ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, uport->mctrl); 2120ab4382d2SGreg Kroah-Hartman ops->start_tx(uport); 2121ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2122ab4382d2SGreg Kroah-Hartman set_bit(ASYNCB_INITIALIZED, &port->flags); 2123ab4382d2SGreg Kroah-Hartman } else { 2124ab4382d2SGreg Kroah-Hartman /* 2125ab4382d2SGreg Kroah-Hartman * Failed to resume - maybe hardware went away? 2126ab4382d2SGreg Kroah-Hartman * Clear the "initialized" flag so we won't try 2127ab4382d2SGreg Kroah-Hartman * to call the low level drivers shutdown method. 2128ab4382d2SGreg Kroah-Hartman */ 2129ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 2130ab4382d2SGreg Kroah-Hartman } 2131ab4382d2SGreg Kroah-Hartman } 2132ab4382d2SGreg Kroah-Hartman 2133ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_SUSPENDED, &port->flags); 2134ab4382d2SGreg Kroah-Hartman } 2135ab4382d2SGreg Kroah-Hartman 2136ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2137ab4382d2SGreg Kroah-Hartman 2138ab4382d2SGreg Kroah-Hartman return 0; 2139ab4382d2SGreg Kroah-Hartman } 2140ab4382d2SGreg Kroah-Hartman 2141ab4382d2SGreg Kroah-Hartman static inline void 2142ab4382d2SGreg Kroah-Hartman uart_report_port(struct uart_driver *drv, struct uart_port *port) 2143ab4382d2SGreg Kroah-Hartman { 2144ab4382d2SGreg Kroah-Hartman char address[64]; 2145ab4382d2SGreg Kroah-Hartman 2146ab4382d2SGreg Kroah-Hartman switch (port->iotype) { 2147ab4382d2SGreg Kroah-Hartman case UPIO_PORT: 2148ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), "I/O 0x%lx", port->iobase); 2149ab4382d2SGreg Kroah-Hartman break; 2150ab4382d2SGreg Kroah-Hartman case UPIO_HUB6: 2151ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), 2152ab4382d2SGreg Kroah-Hartman "I/O 0x%lx offset 0x%x", port->iobase, port->hub6); 2153ab4382d2SGreg Kroah-Hartman break; 2154ab4382d2SGreg Kroah-Hartman case UPIO_MEM: 2155ab4382d2SGreg Kroah-Hartman case UPIO_MEM32: 21563ffb1a81SKevin Cernekee case UPIO_MEM32BE: 2157ab4382d2SGreg Kroah-Hartman case UPIO_AU: 2158ab4382d2SGreg Kroah-Hartman case UPIO_TSI: 2159ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), 2160ab4382d2SGreg Kroah-Hartman "MMIO 0x%llx", (unsigned long long)port->mapbase); 2161ab4382d2SGreg Kroah-Hartman break; 2162ab4382d2SGreg Kroah-Hartman default: 2163ab4382d2SGreg Kroah-Hartman strlcpy(address, "*unknown*", sizeof(address)); 2164ab4382d2SGreg Kroah-Hartman break; 2165ab4382d2SGreg Kroah-Hartman } 2166ab4382d2SGreg Kroah-Hartman 216768ed7e1cSJames Bottomley printk(KERN_INFO "%s%s%s%d at %s (irq = %d, base_baud = %d) is a %s\n", 216868ed7e1cSJames Bottomley port->dev ? dev_name(port->dev) : "", 216968ed7e1cSJames Bottomley port->dev ? ": " : "", 2170ab4382d2SGreg Kroah-Hartman drv->dev_name, 2171ab4382d2SGreg Kroah-Hartman drv->tty_driver->name_base + port->line, 21727d12b976SKees Cook address, port->irq, port->uartclk / 16, uart_type(port)); 2173ab4382d2SGreg Kroah-Hartman } 2174ab4382d2SGreg Kroah-Hartman 2175ab4382d2SGreg Kroah-Hartman static void 2176ab4382d2SGreg Kroah-Hartman uart_configure_port(struct uart_driver *drv, struct uart_state *state, 2177ab4382d2SGreg Kroah-Hartman struct uart_port *port) 2178ab4382d2SGreg Kroah-Hartman { 2179ab4382d2SGreg Kroah-Hartman unsigned int flags; 2180ab4382d2SGreg Kroah-Hartman 2181ab4382d2SGreg Kroah-Hartman /* 2182ab4382d2SGreg Kroah-Hartman * If there isn't a port here, don't do anything further. 2183ab4382d2SGreg Kroah-Hartman */ 2184ab4382d2SGreg Kroah-Hartman if (!port->iobase && !port->mapbase && !port->membase) 2185ab4382d2SGreg Kroah-Hartman return; 2186ab4382d2SGreg Kroah-Hartman 2187ab4382d2SGreg Kroah-Hartman /* 2188ab4382d2SGreg Kroah-Hartman * Now do the auto configuration stuff. Note that config_port 2189ab4382d2SGreg Kroah-Hartman * is expected to claim the resources and map the port for us. 2190ab4382d2SGreg Kroah-Hartman */ 2191ab4382d2SGreg Kroah-Hartman flags = 0; 2192ab4382d2SGreg Kroah-Hartman if (port->flags & UPF_AUTO_IRQ) 2193ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_IRQ; 2194ab4382d2SGreg Kroah-Hartman if (port->flags & UPF_BOOT_AUTOCONF) { 2195ab4382d2SGreg Kroah-Hartman if (!(port->flags & UPF_FIXED_TYPE)) { 2196ab4382d2SGreg Kroah-Hartman port->type = PORT_UNKNOWN; 2197ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_TYPE; 2198ab4382d2SGreg Kroah-Hartman } 2199ab4382d2SGreg Kroah-Hartman port->ops->config_port(port, flags); 2200ab4382d2SGreg Kroah-Hartman } 2201ab4382d2SGreg Kroah-Hartman 2202ab4382d2SGreg Kroah-Hartman if (port->type != PORT_UNKNOWN) { 2203ab4382d2SGreg Kroah-Hartman unsigned long flags; 2204ab4382d2SGreg Kroah-Hartman 2205ab4382d2SGreg Kroah-Hartman uart_report_port(drv, port); 2206ab4382d2SGreg Kroah-Hartman 2207ab4382d2SGreg Kroah-Hartman /* Power up port for set_mctrl() */ 22086f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2209ab4382d2SGreg Kroah-Hartman 2210ab4382d2SGreg Kroah-Hartman /* 2211ab4382d2SGreg Kroah-Hartman * Ensure that the modem control lines are de-activated. 2212ab4382d2SGreg Kroah-Hartman * keep the DTR setting that is set in uart_set_options() 2213ab4382d2SGreg Kroah-Hartman * We probably don't need a spinlock around this, but 2214ab4382d2SGreg Kroah-Hartman */ 2215ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 2216ab4382d2SGreg Kroah-Hartman port->ops->set_mctrl(port, port->mctrl & TIOCM_DTR); 2217ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 2218ab4382d2SGreg Kroah-Hartman 2219ab4382d2SGreg Kroah-Hartman /* 2220ab4382d2SGreg Kroah-Hartman * If this driver supports console, and it hasn't been 2221ab4382d2SGreg Kroah-Hartman * successfully registered yet, try to re-register it. 2222ab4382d2SGreg Kroah-Hartman * It may be that the port was not available. 2223ab4382d2SGreg Kroah-Hartman */ 2224ab4382d2SGreg Kroah-Hartman if (port->cons && !(port->cons->flags & CON_ENABLED)) 2225ab4382d2SGreg Kroah-Hartman register_console(port->cons); 2226ab4382d2SGreg Kroah-Hartman 2227ab4382d2SGreg Kroah-Hartman /* 2228ab4382d2SGreg Kroah-Hartman * Power down all ports by default, except the 2229ab4382d2SGreg Kroah-Hartman * console if we have one. 2230ab4382d2SGreg Kroah-Hartman */ 2231ab4382d2SGreg Kroah-Hartman if (!uart_console(port)) 22326f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_OFF); 2233ab4382d2SGreg Kroah-Hartman } 2234ab4382d2SGreg Kroah-Hartman } 2235ab4382d2SGreg Kroah-Hartman 2236ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 2237ab4382d2SGreg Kroah-Hartman 2238ab4382d2SGreg Kroah-Hartman static int uart_poll_init(struct tty_driver *driver, int line, char *options) 2239ab4382d2SGreg Kroah-Hartman { 2240ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2241ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2242ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2243ab4382d2SGreg Kroah-Hartman int baud = 9600; 2244ab4382d2SGreg Kroah-Hartman int bits = 8; 2245ab4382d2SGreg Kroah-Hartman int parity = 'n'; 2246ab4382d2SGreg Kroah-Hartman int flow = 'n'; 2247c7f3e708SAnton Vorontsov int ret; 2248ab4382d2SGreg Kroah-Hartman 2249ab4382d2SGreg Kroah-Hartman if (!state || !state->uart_port) 2250ab4382d2SGreg Kroah-Hartman return -1; 2251ab4382d2SGreg Kroah-Hartman 2252ab4382d2SGreg Kroah-Hartman port = state->uart_port; 2253ab4382d2SGreg Kroah-Hartman if (!(port->ops->poll_get_char && port->ops->poll_put_char)) 2254ab4382d2SGreg Kroah-Hartman return -1; 2255ab4382d2SGreg Kroah-Hartman 2256c7f3e708SAnton Vorontsov if (port->ops->poll_init) { 2257c7f3e708SAnton Vorontsov struct tty_port *tport = &state->port; 2258c7f3e708SAnton Vorontsov 2259c7f3e708SAnton Vorontsov ret = 0; 2260c7f3e708SAnton Vorontsov mutex_lock(&tport->mutex); 2261c7f3e708SAnton Vorontsov /* 2262c7f3e708SAnton Vorontsov * We don't set ASYNCB_INITIALIZED as we only initialized the 2263c7f3e708SAnton Vorontsov * hw, e.g. state->xmit is still uninitialized. 2264c7f3e708SAnton Vorontsov */ 2265c7f3e708SAnton Vorontsov if (!test_bit(ASYNCB_INITIALIZED, &tport->flags)) 2266c7f3e708SAnton Vorontsov ret = port->ops->poll_init(port); 2267c7f3e708SAnton Vorontsov mutex_unlock(&tport->mutex); 2268c7f3e708SAnton Vorontsov if (ret) 2269c7f3e708SAnton Vorontsov return ret; 2270c7f3e708SAnton Vorontsov } 2271c7f3e708SAnton Vorontsov 2272ab4382d2SGreg Kroah-Hartman if (options) { 2273ab4382d2SGreg Kroah-Hartman uart_parse_options(options, &baud, &parity, &bits, &flow); 2274ab4382d2SGreg Kroah-Hartman return uart_set_options(port, NULL, baud, parity, bits, flow); 2275ab4382d2SGreg Kroah-Hartman } 2276ab4382d2SGreg Kroah-Hartman 2277ab4382d2SGreg Kroah-Hartman return 0; 2278ab4382d2SGreg Kroah-Hartman } 2279ab4382d2SGreg Kroah-Hartman 2280ab4382d2SGreg Kroah-Hartman static int uart_poll_get_char(struct tty_driver *driver, int line) 2281ab4382d2SGreg Kroah-Hartman { 2282ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2283ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2284ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2285ab4382d2SGreg Kroah-Hartman 2286ab4382d2SGreg Kroah-Hartman if (!state || !state->uart_port) 2287ab4382d2SGreg Kroah-Hartman return -1; 2288ab4382d2SGreg Kroah-Hartman 2289ab4382d2SGreg Kroah-Hartman port = state->uart_port; 2290ab4382d2SGreg Kroah-Hartman return port->ops->poll_get_char(port); 2291ab4382d2SGreg Kroah-Hartman } 2292ab4382d2SGreg Kroah-Hartman 2293ab4382d2SGreg Kroah-Hartman static void uart_poll_put_char(struct tty_driver *driver, int line, char ch) 2294ab4382d2SGreg Kroah-Hartman { 2295ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2296ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2297ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2298ab4382d2SGreg Kroah-Hartman 2299ab4382d2SGreg Kroah-Hartman if (!state || !state->uart_port) 2300ab4382d2SGreg Kroah-Hartman return; 2301ab4382d2SGreg Kroah-Hartman 2302ab4382d2SGreg Kroah-Hartman port = state->uart_port; 2303c7d44a02SDoug Anderson 2304c7d44a02SDoug Anderson if (ch == '\n') 2305c7d44a02SDoug Anderson port->ops->poll_put_char(port, '\r'); 2306ab4382d2SGreg Kroah-Hartman port->ops->poll_put_char(port, ch); 2307ab4382d2SGreg Kroah-Hartman } 2308ab4382d2SGreg Kroah-Hartman #endif 2309ab4382d2SGreg Kroah-Hartman 2310ab4382d2SGreg Kroah-Hartman static const struct tty_operations uart_ops = { 2311ab4382d2SGreg Kroah-Hartman .open = uart_open, 2312ab4382d2SGreg Kroah-Hartman .close = uart_close, 2313ab4382d2SGreg Kroah-Hartman .write = uart_write, 2314ab4382d2SGreg Kroah-Hartman .put_char = uart_put_char, 2315ab4382d2SGreg Kroah-Hartman .flush_chars = uart_flush_chars, 2316ab4382d2SGreg Kroah-Hartman .write_room = uart_write_room, 2317ab4382d2SGreg Kroah-Hartman .chars_in_buffer= uart_chars_in_buffer, 2318ab4382d2SGreg Kroah-Hartman .flush_buffer = uart_flush_buffer, 2319ab4382d2SGreg Kroah-Hartman .ioctl = uart_ioctl, 2320ab4382d2SGreg Kroah-Hartman .throttle = uart_throttle, 2321ab4382d2SGreg Kroah-Hartman .unthrottle = uart_unthrottle, 2322ab4382d2SGreg Kroah-Hartman .send_xchar = uart_send_xchar, 2323ab4382d2SGreg Kroah-Hartman .set_termios = uart_set_termios, 2324ab4382d2SGreg Kroah-Hartman .set_ldisc = uart_set_ldisc, 2325ab4382d2SGreg Kroah-Hartman .stop = uart_stop, 2326ab4382d2SGreg Kroah-Hartman .start = uart_start, 2327ab4382d2SGreg Kroah-Hartman .hangup = uart_hangup, 2328ab4382d2SGreg Kroah-Hartman .break_ctl = uart_break_ctl, 2329ab4382d2SGreg Kroah-Hartman .wait_until_sent= uart_wait_until_sent, 2330ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_PROC_FS 2331ab4382d2SGreg Kroah-Hartman .proc_fops = &uart_proc_fops, 2332ab4382d2SGreg Kroah-Hartman #endif 2333ab4382d2SGreg Kroah-Hartman .tiocmget = uart_tiocmget, 2334ab4382d2SGreg Kroah-Hartman .tiocmset = uart_tiocmset, 2335ab4382d2SGreg Kroah-Hartman .get_icount = uart_get_icount, 2336ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 2337ab4382d2SGreg Kroah-Hartman .poll_init = uart_poll_init, 2338ab4382d2SGreg Kroah-Hartman .poll_get_char = uart_poll_get_char, 2339ab4382d2SGreg Kroah-Hartman .poll_put_char = uart_poll_put_char, 2340ab4382d2SGreg Kroah-Hartman #endif 2341ab4382d2SGreg Kroah-Hartman }; 2342ab4382d2SGreg Kroah-Hartman 2343ab4382d2SGreg Kroah-Hartman static const struct tty_port_operations uart_port_ops = { 23440b1db830SJiri Slaby .activate = uart_port_activate, 23450b1db830SJiri Slaby .shutdown = uart_port_shutdown, 2346ab4382d2SGreg Kroah-Hartman .carrier_raised = uart_carrier_raised, 2347ab4382d2SGreg Kroah-Hartman .dtr_rts = uart_dtr_rts, 2348ab4382d2SGreg Kroah-Hartman }; 2349ab4382d2SGreg Kroah-Hartman 2350ab4382d2SGreg Kroah-Hartman /** 2351ab4382d2SGreg Kroah-Hartman * uart_register_driver - register a driver with the uart core layer 2352ab4382d2SGreg Kroah-Hartman * @drv: low level driver structure 2353ab4382d2SGreg Kroah-Hartman * 2354ab4382d2SGreg Kroah-Hartman * Register a uart driver with the core driver. We in turn register 2355ab4382d2SGreg Kroah-Hartman * with the tty layer, and initialise the core driver per-port state. 2356ab4382d2SGreg Kroah-Hartman * 2357ab4382d2SGreg Kroah-Hartman * We have a proc file in /proc/tty/driver which is named after the 2358ab4382d2SGreg Kroah-Hartman * normal driver. 2359ab4382d2SGreg Kroah-Hartman * 2360ab4382d2SGreg Kroah-Hartman * drv->port should be NULL, and the per-port structures should be 2361ab4382d2SGreg Kroah-Hartman * registered using uart_add_one_port after this call has succeeded. 2362ab4382d2SGreg Kroah-Hartman */ 2363ab4382d2SGreg Kroah-Hartman int uart_register_driver(struct uart_driver *drv) 2364ab4382d2SGreg Kroah-Hartman { 2365ab4382d2SGreg Kroah-Hartman struct tty_driver *normal; 2366ab4382d2SGreg Kroah-Hartman int i, retval; 2367ab4382d2SGreg Kroah-Hartman 2368ab4382d2SGreg Kroah-Hartman BUG_ON(drv->state); 2369ab4382d2SGreg Kroah-Hartman 2370ab4382d2SGreg Kroah-Hartman /* 2371ab4382d2SGreg Kroah-Hartman * Maybe we should be using a slab cache for this, especially if 2372ab4382d2SGreg Kroah-Hartman * we have a large number of ports to handle. 2373ab4382d2SGreg Kroah-Hartman */ 2374ab4382d2SGreg Kroah-Hartman drv->state = kzalloc(sizeof(struct uart_state) * drv->nr, GFP_KERNEL); 2375ab4382d2SGreg Kroah-Hartman if (!drv->state) 2376ab4382d2SGreg Kroah-Hartman goto out; 2377ab4382d2SGreg Kroah-Hartman 2378ab4382d2SGreg Kroah-Hartman normal = alloc_tty_driver(drv->nr); 2379ab4382d2SGreg Kroah-Hartman if (!normal) 2380ab4382d2SGreg Kroah-Hartman goto out_kfree; 2381ab4382d2SGreg Kroah-Hartman 2382ab4382d2SGreg Kroah-Hartman drv->tty_driver = normal; 2383ab4382d2SGreg Kroah-Hartman 2384ab4382d2SGreg Kroah-Hartman normal->driver_name = drv->driver_name; 2385ab4382d2SGreg Kroah-Hartman normal->name = drv->dev_name; 2386ab4382d2SGreg Kroah-Hartman normal->major = drv->major; 2387ab4382d2SGreg Kroah-Hartman normal->minor_start = drv->minor; 2388ab4382d2SGreg Kroah-Hartman normal->type = TTY_DRIVER_TYPE_SERIAL; 2389ab4382d2SGreg Kroah-Hartman normal->subtype = SERIAL_TYPE_NORMAL; 2390ab4382d2SGreg Kroah-Hartman normal->init_termios = tty_std_termios; 2391ab4382d2SGreg Kroah-Hartman normal->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; 2392ab4382d2SGreg Kroah-Hartman normal->init_termios.c_ispeed = normal->init_termios.c_ospeed = 9600; 2393ab4382d2SGreg Kroah-Hartman normal->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; 2394ab4382d2SGreg Kroah-Hartman normal->driver_state = drv; 2395ab4382d2SGreg Kroah-Hartman tty_set_operations(normal, &uart_ops); 2396ab4382d2SGreg Kroah-Hartman 2397ab4382d2SGreg Kroah-Hartman /* 2398ab4382d2SGreg Kroah-Hartman * Initialise the UART state(s). 2399ab4382d2SGreg Kroah-Hartman */ 2400ab4382d2SGreg Kroah-Hartman for (i = 0; i < drv->nr; i++) { 2401ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + i; 2402ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2403ab4382d2SGreg Kroah-Hartman 2404ab4382d2SGreg Kroah-Hartman tty_port_init(port); 2405ab4382d2SGreg Kroah-Hartman port->ops = &uart_port_ops; 2406ab4382d2SGreg Kroah-Hartman } 2407ab4382d2SGreg Kroah-Hartman 2408ab4382d2SGreg Kroah-Hartman retval = tty_register_driver(normal); 2409ab4382d2SGreg Kroah-Hartman if (retval >= 0) 2410ab4382d2SGreg Kroah-Hartman return retval; 2411ab4382d2SGreg Kroah-Hartman 2412191c5f10SJiri Slaby for (i = 0; i < drv->nr; i++) 2413191c5f10SJiri Slaby tty_port_destroy(&drv->state[i].port); 2414ab4382d2SGreg Kroah-Hartman put_tty_driver(normal); 2415ab4382d2SGreg Kroah-Hartman out_kfree: 2416ab4382d2SGreg Kroah-Hartman kfree(drv->state); 2417ab4382d2SGreg Kroah-Hartman out: 2418ab4382d2SGreg Kroah-Hartman return -ENOMEM; 2419ab4382d2SGreg Kroah-Hartman } 2420ab4382d2SGreg Kroah-Hartman 2421ab4382d2SGreg Kroah-Hartman /** 2422ab4382d2SGreg Kroah-Hartman * uart_unregister_driver - remove a driver from the uart core layer 2423ab4382d2SGreg Kroah-Hartman * @drv: low level driver structure 2424ab4382d2SGreg Kroah-Hartman * 2425ab4382d2SGreg Kroah-Hartman * Remove all references to a driver from the core driver. The low 2426ab4382d2SGreg Kroah-Hartman * level driver must have removed all its ports via the 2427ab4382d2SGreg Kroah-Hartman * uart_remove_one_port() if it registered them with uart_add_one_port(). 2428ab4382d2SGreg Kroah-Hartman * (ie, drv->port == NULL) 2429ab4382d2SGreg Kroah-Hartman */ 2430ab4382d2SGreg Kroah-Hartman void uart_unregister_driver(struct uart_driver *drv) 2431ab4382d2SGreg Kroah-Hartman { 2432ab4382d2SGreg Kroah-Hartman struct tty_driver *p = drv->tty_driver; 2433191c5f10SJiri Slaby unsigned int i; 2434191c5f10SJiri Slaby 2435ab4382d2SGreg Kroah-Hartman tty_unregister_driver(p); 2436ab4382d2SGreg Kroah-Hartman put_tty_driver(p); 2437191c5f10SJiri Slaby for (i = 0; i < drv->nr; i++) 2438191c5f10SJiri Slaby tty_port_destroy(&drv->state[i].port); 2439ab4382d2SGreg Kroah-Hartman kfree(drv->state); 24401e66cdedSAlan Cox drv->state = NULL; 2441ab4382d2SGreg Kroah-Hartman drv->tty_driver = NULL; 2442ab4382d2SGreg Kroah-Hartman } 2443ab4382d2SGreg Kroah-Hartman 2444ab4382d2SGreg Kroah-Hartman struct tty_driver *uart_console_device(struct console *co, int *index) 2445ab4382d2SGreg Kroah-Hartman { 2446ab4382d2SGreg Kroah-Hartman struct uart_driver *p = co->data; 2447ab4382d2SGreg Kroah-Hartman *index = co->index; 2448ab4382d2SGreg Kroah-Hartman return p->tty_driver; 2449ab4382d2SGreg Kroah-Hartman } 2450ab4382d2SGreg Kroah-Hartman 24516915c0e4STomas Hlavacek static ssize_t uart_get_attr_uartclk(struct device *dev, 24526915c0e4STomas Hlavacek struct device_attribute *attr, char *buf) 24536915c0e4STomas Hlavacek { 2454bebe73e3SAlan Cox struct serial_struct tmp; 24556915c0e4STomas Hlavacek struct tty_port *port = dev_get_drvdata(dev); 2456b1b79916STomas Hlavacek 24579f109694SAlan Cox uart_get_info(port, &tmp); 2458bebe73e3SAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.baud_base * 16); 24596915c0e4STomas Hlavacek } 24606915c0e4STomas Hlavacek 2461373bac4cSAlan Cox static ssize_t uart_get_attr_type(struct device *dev, 2462373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2463373bac4cSAlan Cox { 2464373bac4cSAlan Cox struct serial_struct tmp; 2465373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2466373bac4cSAlan Cox 2467373bac4cSAlan Cox uart_get_info(port, &tmp); 2468373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.type); 2469373bac4cSAlan Cox } 2470373bac4cSAlan Cox static ssize_t uart_get_attr_line(struct device *dev, 2471373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2472373bac4cSAlan Cox { 2473373bac4cSAlan Cox struct serial_struct tmp; 2474373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2475373bac4cSAlan Cox 2476373bac4cSAlan Cox uart_get_info(port, &tmp); 2477373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.line); 2478373bac4cSAlan Cox } 2479373bac4cSAlan Cox 2480373bac4cSAlan Cox static ssize_t uart_get_attr_port(struct device *dev, 2481373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2482373bac4cSAlan Cox { 2483373bac4cSAlan Cox struct serial_struct tmp; 2484373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2485fd985e1dSAndrew Morton unsigned long ioaddr; 2486373bac4cSAlan Cox 2487373bac4cSAlan Cox uart_get_info(port, &tmp); 2488fd985e1dSAndrew Morton ioaddr = tmp.port; 2489fd985e1dSAndrew Morton if (HIGH_BITS_OFFSET) 2490fd985e1dSAndrew Morton ioaddr |= (unsigned long)tmp.port_high << HIGH_BITS_OFFSET; 2491fd985e1dSAndrew Morton return snprintf(buf, PAGE_SIZE, "0x%lX\n", ioaddr); 2492373bac4cSAlan Cox } 2493373bac4cSAlan Cox 2494373bac4cSAlan Cox static ssize_t uart_get_attr_irq(struct device *dev, 2495373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2496373bac4cSAlan Cox { 2497373bac4cSAlan Cox struct serial_struct tmp; 2498373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2499373bac4cSAlan Cox 2500373bac4cSAlan Cox uart_get_info(port, &tmp); 2501373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.irq); 2502373bac4cSAlan Cox } 2503373bac4cSAlan Cox 2504373bac4cSAlan Cox static ssize_t uart_get_attr_flags(struct device *dev, 2505373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2506373bac4cSAlan Cox { 2507373bac4cSAlan Cox struct serial_struct tmp; 2508373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2509373bac4cSAlan Cox 2510373bac4cSAlan Cox uart_get_info(port, &tmp); 2511373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "0x%X\n", tmp.flags); 2512373bac4cSAlan Cox } 2513373bac4cSAlan Cox 2514373bac4cSAlan Cox static ssize_t uart_get_attr_xmit_fifo_size(struct device *dev, 2515373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2516373bac4cSAlan Cox { 2517373bac4cSAlan Cox struct serial_struct tmp; 2518373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2519373bac4cSAlan Cox 2520373bac4cSAlan Cox uart_get_info(port, &tmp); 2521373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.xmit_fifo_size); 2522373bac4cSAlan Cox } 2523373bac4cSAlan Cox 2524373bac4cSAlan Cox 2525373bac4cSAlan Cox static ssize_t uart_get_attr_close_delay(struct device *dev, 2526373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2527373bac4cSAlan Cox { 2528373bac4cSAlan Cox struct serial_struct tmp; 2529373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2530373bac4cSAlan Cox 2531373bac4cSAlan Cox uart_get_info(port, &tmp); 2532373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.close_delay); 2533373bac4cSAlan Cox } 2534373bac4cSAlan Cox 2535373bac4cSAlan Cox 2536373bac4cSAlan Cox static ssize_t uart_get_attr_closing_wait(struct device *dev, 2537373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2538373bac4cSAlan Cox { 2539373bac4cSAlan Cox struct serial_struct tmp; 2540373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2541373bac4cSAlan Cox 2542373bac4cSAlan Cox uart_get_info(port, &tmp); 2543373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.closing_wait); 2544373bac4cSAlan Cox } 2545373bac4cSAlan Cox 2546373bac4cSAlan Cox static ssize_t uart_get_attr_custom_divisor(struct device *dev, 2547373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2548373bac4cSAlan Cox { 2549373bac4cSAlan Cox struct serial_struct tmp; 2550373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2551373bac4cSAlan Cox 2552373bac4cSAlan Cox uart_get_info(port, &tmp); 2553373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.custom_divisor); 2554373bac4cSAlan Cox } 2555373bac4cSAlan Cox 2556373bac4cSAlan Cox static ssize_t uart_get_attr_io_type(struct device *dev, 2557373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2558373bac4cSAlan Cox { 2559373bac4cSAlan Cox struct serial_struct tmp; 2560373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2561373bac4cSAlan Cox 2562373bac4cSAlan Cox uart_get_info(port, &tmp); 2563373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.io_type); 2564373bac4cSAlan Cox } 2565373bac4cSAlan Cox 2566373bac4cSAlan Cox static ssize_t uart_get_attr_iomem_base(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, "0x%lX\n", (unsigned long)tmp.iomem_base); 2574373bac4cSAlan Cox } 2575373bac4cSAlan Cox 2576373bac4cSAlan Cox static ssize_t uart_get_attr_iomem_reg_shift(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.iomem_reg_shift); 2584373bac4cSAlan Cox } 2585373bac4cSAlan Cox 2586373bac4cSAlan Cox static DEVICE_ATTR(type, S_IRUSR | S_IRGRP, uart_get_attr_type, NULL); 2587373bac4cSAlan Cox static DEVICE_ATTR(line, S_IRUSR | S_IRGRP, uart_get_attr_line, NULL); 2588373bac4cSAlan Cox static DEVICE_ATTR(port, S_IRUSR | S_IRGRP, uart_get_attr_port, NULL); 2589373bac4cSAlan Cox static DEVICE_ATTR(irq, S_IRUSR | S_IRGRP, uart_get_attr_irq, NULL); 2590373bac4cSAlan Cox static DEVICE_ATTR(flags, S_IRUSR | S_IRGRP, uart_get_attr_flags, NULL); 2591373bac4cSAlan Cox static DEVICE_ATTR(xmit_fifo_size, S_IRUSR | S_IRGRP, uart_get_attr_xmit_fifo_size, NULL); 25926915c0e4STomas Hlavacek static DEVICE_ATTR(uartclk, S_IRUSR | S_IRGRP, uart_get_attr_uartclk, NULL); 2593373bac4cSAlan Cox static DEVICE_ATTR(close_delay, S_IRUSR | S_IRGRP, uart_get_attr_close_delay, NULL); 2594373bac4cSAlan Cox static DEVICE_ATTR(closing_wait, S_IRUSR | S_IRGRP, uart_get_attr_closing_wait, NULL); 2595373bac4cSAlan Cox static DEVICE_ATTR(custom_divisor, S_IRUSR | S_IRGRP, uart_get_attr_custom_divisor, NULL); 2596373bac4cSAlan Cox static DEVICE_ATTR(io_type, S_IRUSR | S_IRGRP, uart_get_attr_io_type, NULL); 2597373bac4cSAlan Cox static DEVICE_ATTR(iomem_base, S_IRUSR | S_IRGRP, uart_get_attr_iomem_base, NULL); 2598373bac4cSAlan Cox static DEVICE_ATTR(iomem_reg_shift, S_IRUSR | S_IRGRP, uart_get_attr_iomem_reg_shift, NULL); 25996915c0e4STomas Hlavacek 26006915c0e4STomas Hlavacek static struct attribute *tty_dev_attrs[] = { 2601373bac4cSAlan Cox &dev_attr_type.attr, 2602373bac4cSAlan Cox &dev_attr_line.attr, 2603373bac4cSAlan Cox &dev_attr_port.attr, 2604373bac4cSAlan Cox &dev_attr_irq.attr, 2605373bac4cSAlan Cox &dev_attr_flags.attr, 2606373bac4cSAlan Cox &dev_attr_xmit_fifo_size.attr, 26076915c0e4STomas Hlavacek &dev_attr_uartclk.attr, 2608373bac4cSAlan Cox &dev_attr_close_delay.attr, 2609373bac4cSAlan Cox &dev_attr_closing_wait.attr, 2610373bac4cSAlan Cox &dev_attr_custom_divisor.attr, 2611373bac4cSAlan Cox &dev_attr_io_type.attr, 2612373bac4cSAlan Cox &dev_attr_iomem_base.attr, 2613373bac4cSAlan Cox &dev_attr_iomem_reg_shift.attr, 26146915c0e4STomas Hlavacek NULL, 26156915c0e4STomas Hlavacek }; 26166915c0e4STomas Hlavacek 2617b1b79916STomas Hlavacek static const struct attribute_group tty_dev_attr_group = { 26186915c0e4STomas Hlavacek .attrs = tty_dev_attrs, 26196915c0e4STomas Hlavacek }; 26206915c0e4STomas Hlavacek 2621ab4382d2SGreg Kroah-Hartman /** 2622ab4382d2SGreg Kroah-Hartman * uart_add_one_port - attach a driver-defined port structure 2623ab4382d2SGreg Kroah-Hartman * @drv: pointer to the uart low level driver structure for this port 2624ab4382d2SGreg Kroah-Hartman * @uport: uart port structure to use for this port. 2625ab4382d2SGreg Kroah-Hartman * 2626ab4382d2SGreg Kroah-Hartman * This allows the driver to register its own uart_port structure 2627ab4382d2SGreg Kroah-Hartman * with the core driver. The main purpose is to allow the low 2628ab4382d2SGreg Kroah-Hartman * level uart drivers to expand uart_port, rather than having yet 2629ab4382d2SGreg Kroah-Hartman * more levels of structures. 2630ab4382d2SGreg Kroah-Hartman */ 2631ab4382d2SGreg Kroah-Hartman int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport) 2632ab4382d2SGreg Kroah-Hartman { 2633ab4382d2SGreg Kroah-Hartman struct uart_state *state; 2634ab4382d2SGreg Kroah-Hartman struct tty_port *port; 2635ab4382d2SGreg Kroah-Hartman int ret = 0; 2636ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 2637266dcff0SGreg Kroah-Hartman int num_groups; 2638ab4382d2SGreg Kroah-Hartman 2639ab4382d2SGreg Kroah-Hartman BUG_ON(in_interrupt()); 2640ab4382d2SGreg Kroah-Hartman 2641ab4382d2SGreg Kroah-Hartman if (uport->line >= drv->nr) 2642ab4382d2SGreg Kroah-Hartman return -EINVAL; 2643ab4382d2SGreg Kroah-Hartman 2644ab4382d2SGreg Kroah-Hartman state = drv->state + uport->line; 2645ab4382d2SGreg Kroah-Hartman port = &state->port; 2646ab4382d2SGreg Kroah-Hartman 2647ab4382d2SGreg Kroah-Hartman mutex_lock(&port_mutex); 2648ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2649ab4382d2SGreg Kroah-Hartman if (state->uart_port) { 2650ab4382d2SGreg Kroah-Hartman ret = -EINVAL; 2651ab4382d2SGreg Kroah-Hartman goto out; 2652ab4382d2SGreg Kroah-Hartman } 2653ab4382d2SGreg Kroah-Hartman 26542b702b9bSPeter Hurley /* Link the port to the driver state table and vice versa */ 2655ab4382d2SGreg Kroah-Hartman state->uart_port = uport; 2656ab4382d2SGreg Kroah-Hartman uport->state = state; 2657ab4382d2SGreg Kroah-Hartman 26582b702b9bSPeter Hurley state->pm_state = UART_PM_STATE_UNDEFINED; 26592b702b9bSPeter Hurley uport->cons = drv->cons; 26602b702b9bSPeter Hurley 2661ab4382d2SGreg Kroah-Hartman /* 2662ab4382d2SGreg Kroah-Hartman * If this port is a console, then the spinlock is already 2663ab4382d2SGreg Kroah-Hartman * initialised. 2664ab4382d2SGreg Kroah-Hartman */ 2665ab4382d2SGreg Kroah-Hartman if (!(uart_console(uport) && (uport->cons->flags & CON_ENABLED))) { 2666ab4382d2SGreg Kroah-Hartman spin_lock_init(&uport->lock); 2667ab4382d2SGreg Kroah-Hartman lockdep_set_class(&uport->lock, &port_lock_key); 2668ab4382d2SGreg Kroah-Hartman } 2669a208ffd2SGrant Likely if (uport->cons && uport->dev) 2670a208ffd2SGrant Likely of_console_check(uport->dev->of_node, uport->cons->name, uport->line); 2671ab4382d2SGreg Kroah-Hartman 2672ab4382d2SGreg Kroah-Hartman uart_configure_port(drv, state, uport); 2673ab4382d2SGreg Kroah-Hartman 2674266dcff0SGreg Kroah-Hartman num_groups = 2; 2675266dcff0SGreg Kroah-Hartman if (uport->attr_group) 2676266dcff0SGreg Kroah-Hartman num_groups++; 2677266dcff0SGreg Kroah-Hartman 2678c2b703b8SYoshihiro YUNOMAE uport->tty_groups = kcalloc(num_groups, sizeof(*uport->tty_groups), 2679266dcff0SGreg Kroah-Hartman GFP_KERNEL); 2680266dcff0SGreg Kroah-Hartman if (!uport->tty_groups) { 2681266dcff0SGreg Kroah-Hartman ret = -ENOMEM; 2682266dcff0SGreg Kroah-Hartman goto out; 2683266dcff0SGreg Kroah-Hartman } 2684266dcff0SGreg Kroah-Hartman uport->tty_groups[0] = &tty_dev_attr_group; 2685266dcff0SGreg Kroah-Hartman if (uport->attr_group) 2686266dcff0SGreg Kroah-Hartman uport->tty_groups[1] = uport->attr_group; 2687266dcff0SGreg Kroah-Hartman 2688ab4382d2SGreg Kroah-Hartman /* 2689ab4382d2SGreg Kroah-Hartman * Register the port whether it's detected or not. This allows 2690015355b7SGeert Uytterhoeven * setserial to be used to alter this port's parameters. 2691ab4382d2SGreg Kroah-Hartman */ 2692b1b79916STomas Hlavacek tty_dev = tty_port_register_device_attr(port, drv->tty_driver, 2693266dcff0SGreg Kroah-Hartman uport->line, uport->dev, port, uport->tty_groups); 2694ab4382d2SGreg Kroah-Hartman if (likely(!IS_ERR(tty_dev))) { 269577359835SSimon Glass device_set_wakeup_capable(tty_dev, 1); 269677359835SSimon Glass } else { 26972f2dafe7SSudip Mukherjee dev_err(uport->dev, "Cannot register tty device on line %d\n", 2698ab4382d2SGreg Kroah-Hartman uport->line); 269977359835SSimon Glass } 2700ab4382d2SGreg Kroah-Hartman 2701ab4382d2SGreg Kroah-Hartman /* 2702ab4382d2SGreg Kroah-Hartman * Ensure UPF_DEAD is not set. 2703ab4382d2SGreg Kroah-Hartman */ 2704ab4382d2SGreg Kroah-Hartman uport->flags &= ~UPF_DEAD; 2705ab4382d2SGreg Kroah-Hartman 2706ab4382d2SGreg Kroah-Hartman out: 2707ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2708ab4382d2SGreg Kroah-Hartman mutex_unlock(&port_mutex); 2709ab4382d2SGreg Kroah-Hartman 2710ab4382d2SGreg Kroah-Hartman return ret; 2711ab4382d2SGreg Kroah-Hartman } 2712ab4382d2SGreg Kroah-Hartman 2713ab4382d2SGreg Kroah-Hartman /** 2714ab4382d2SGreg Kroah-Hartman * uart_remove_one_port - detach a driver defined port structure 2715ab4382d2SGreg Kroah-Hartman * @drv: pointer to the uart low level driver structure for this port 2716ab4382d2SGreg Kroah-Hartman * @uport: uart port structure for this port 2717ab4382d2SGreg Kroah-Hartman * 2718ab4382d2SGreg Kroah-Hartman * This unhooks (and hangs up) the specified port structure from the 2719ab4382d2SGreg Kroah-Hartman * core driver. No further calls will be made to the low-level code 2720ab4382d2SGreg Kroah-Hartman * for this port. 2721ab4382d2SGreg Kroah-Hartman */ 2722ab4382d2SGreg Kroah-Hartman int uart_remove_one_port(struct uart_driver *drv, struct uart_port *uport) 2723ab4382d2SGreg Kroah-Hartman { 2724ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 2725ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 27264c6d5b4dSGeert Uytterhoeven struct tty_struct *tty; 2727b342dd51SChen Gang int ret = 0; 2728ab4382d2SGreg Kroah-Hartman 2729ab4382d2SGreg Kroah-Hartman BUG_ON(in_interrupt()); 2730ab4382d2SGreg Kroah-Hartman 2731ab4382d2SGreg Kroah-Hartman if (state->uart_port != uport) 27322f2dafe7SSudip Mukherjee dev_alert(uport->dev, "Removing wrong port: %p != %p\n", 2733ab4382d2SGreg Kroah-Hartman state->uart_port, uport); 2734ab4382d2SGreg Kroah-Hartman 2735ab4382d2SGreg Kroah-Hartman mutex_lock(&port_mutex); 2736ab4382d2SGreg Kroah-Hartman 2737ab4382d2SGreg Kroah-Hartman /* 2738ab4382d2SGreg Kroah-Hartman * Mark the port "dead" - this prevents any opens from 2739ab4382d2SGreg Kroah-Hartman * succeeding while we shut down the port. 2740ab4382d2SGreg Kroah-Hartman */ 2741ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2742b342dd51SChen Gang if (!state->uart_port) { 2743b342dd51SChen Gang mutex_unlock(&port->mutex); 2744b342dd51SChen Gang ret = -EINVAL; 2745b342dd51SChen Gang goto out; 2746b342dd51SChen Gang } 2747ab4382d2SGreg Kroah-Hartman uport->flags |= UPF_DEAD; 2748ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2749ab4382d2SGreg Kroah-Hartman 2750ab4382d2SGreg Kroah-Hartman /* 2751ab4382d2SGreg Kroah-Hartman * Remove the devices from the tty layer 2752ab4382d2SGreg Kroah-Hartman */ 2753ab4382d2SGreg Kroah-Hartman tty_unregister_device(drv->tty_driver, uport->line); 2754ab4382d2SGreg Kroah-Hartman 27554c6d5b4dSGeert Uytterhoeven tty = tty_port_tty_get(port); 27564c6d5b4dSGeert Uytterhoeven if (tty) { 2757ab4382d2SGreg Kroah-Hartman tty_vhangup(port->tty); 27584c6d5b4dSGeert Uytterhoeven tty_kref_put(tty); 27594c6d5b4dSGeert Uytterhoeven } 2760ab4382d2SGreg Kroah-Hartman 2761ab4382d2SGreg Kroah-Hartman /* 27625f5c9ae5SGeert Uytterhoeven * If the port is used as a console, unregister it 27635f5c9ae5SGeert Uytterhoeven */ 27645f5c9ae5SGeert Uytterhoeven if (uart_console(uport)) 27655f5c9ae5SGeert Uytterhoeven unregister_console(uport->cons); 27665f5c9ae5SGeert Uytterhoeven 27675f5c9ae5SGeert Uytterhoeven /* 2768ab4382d2SGreg Kroah-Hartman * Free the port IO and memory resources, if any. 2769ab4382d2SGreg Kroah-Hartman */ 2770ab4382d2SGreg Kroah-Hartman if (uport->type != PORT_UNKNOWN) 2771ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 2772266dcff0SGreg Kroah-Hartman kfree(uport->tty_groups); 2773ab4382d2SGreg Kroah-Hartman 2774ab4382d2SGreg Kroah-Hartman /* 2775ab4382d2SGreg Kroah-Hartman * Indicate that there isn't a port here anymore. 2776ab4382d2SGreg Kroah-Hartman */ 2777ab4382d2SGreg Kroah-Hartman uport->type = PORT_UNKNOWN; 2778ab4382d2SGreg Kroah-Hartman 2779ab4382d2SGreg Kroah-Hartman state->uart_port = NULL; 2780b342dd51SChen Gang out: 2781ab4382d2SGreg Kroah-Hartman mutex_unlock(&port_mutex); 2782ab4382d2SGreg Kroah-Hartman 2783b342dd51SChen Gang return ret; 2784ab4382d2SGreg Kroah-Hartman } 2785ab4382d2SGreg Kroah-Hartman 2786ab4382d2SGreg Kroah-Hartman /* 2787ab4382d2SGreg Kroah-Hartman * Are the two ports equivalent? 2788ab4382d2SGreg Kroah-Hartman */ 2789ab4382d2SGreg Kroah-Hartman int uart_match_port(struct uart_port *port1, struct uart_port *port2) 2790ab4382d2SGreg Kroah-Hartman { 2791ab4382d2SGreg Kroah-Hartman if (port1->iotype != port2->iotype) 2792ab4382d2SGreg Kroah-Hartman return 0; 2793ab4382d2SGreg Kroah-Hartman 2794ab4382d2SGreg Kroah-Hartman switch (port1->iotype) { 2795ab4382d2SGreg Kroah-Hartman case UPIO_PORT: 2796ab4382d2SGreg Kroah-Hartman return (port1->iobase == port2->iobase); 2797ab4382d2SGreg Kroah-Hartman case UPIO_HUB6: 2798ab4382d2SGreg Kroah-Hartman return (port1->iobase == port2->iobase) && 2799ab4382d2SGreg Kroah-Hartman (port1->hub6 == port2->hub6); 2800ab4382d2SGreg Kroah-Hartman case UPIO_MEM: 2801ab4382d2SGreg Kroah-Hartman case UPIO_MEM32: 28023ffb1a81SKevin Cernekee case UPIO_MEM32BE: 2803ab4382d2SGreg Kroah-Hartman case UPIO_AU: 2804ab4382d2SGreg Kroah-Hartman case UPIO_TSI: 2805ab4382d2SGreg Kroah-Hartman return (port1->mapbase == port2->mapbase); 2806ab4382d2SGreg Kroah-Hartman } 2807ab4382d2SGreg Kroah-Hartman return 0; 2808ab4382d2SGreg Kroah-Hartman } 2809ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_match_port); 2810ab4382d2SGreg Kroah-Hartman 2811027d7dacSJiri Slaby /** 2812027d7dacSJiri Slaby * uart_handle_dcd_change - handle a change of carrier detect state 2813027d7dacSJiri Slaby * @uport: uart_port structure for the open port 2814027d7dacSJiri Slaby * @status: new carrier detect status, nonzero if active 28154d90bb14SPeter Hurley * 28164d90bb14SPeter Hurley * Caller must hold uport->lock 2817027d7dacSJiri Slaby */ 2818027d7dacSJiri Slaby void uart_handle_dcd_change(struct uart_port *uport, unsigned int status) 2819027d7dacSJiri Slaby { 282042381572SGeorge Spelvin struct tty_port *port = &uport->state->port; 282143eca0aeSAlan Cox struct tty_struct *tty = port->tty; 2822c993257bSPeter Hurley struct tty_ldisc *ld; 2823027d7dacSJiri Slaby 28244d90bb14SPeter Hurley lockdep_assert_held_once(&uport->lock); 28254d90bb14SPeter Hurley 2826c993257bSPeter Hurley if (tty) { 2827c993257bSPeter Hurley ld = tty_ldisc_ref(tty); 282842381572SGeorge Spelvin if (ld) { 282942381572SGeorge Spelvin if (ld->ops->dcd_change) 2830593fb1aeSGeorge Spelvin ld->ops->dcd_change(tty, status); 283142381572SGeorge Spelvin tty_ldisc_deref(ld); 283242381572SGeorge Spelvin } 2833c993257bSPeter Hurley } 2834027d7dacSJiri Slaby 2835027d7dacSJiri Slaby uport->icount.dcd++; 2836027d7dacSJiri Slaby 2837299245a1SPeter Hurley if (uart_dcd_enabled(uport)) { 2838027d7dacSJiri Slaby if (status) 2839027d7dacSJiri Slaby wake_up_interruptible(&port->open_wait); 284043eca0aeSAlan Cox else if (tty) 284143eca0aeSAlan Cox tty_hangup(tty); 2842027d7dacSJiri Slaby } 2843027d7dacSJiri Slaby } 2844027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_handle_dcd_change); 2845027d7dacSJiri Slaby 2846027d7dacSJiri Slaby /** 2847027d7dacSJiri Slaby * uart_handle_cts_change - handle a change of clear-to-send state 2848027d7dacSJiri Slaby * @uport: uart_port structure for the open port 2849027d7dacSJiri Slaby * @status: new clear to send status, nonzero if active 28504d90bb14SPeter Hurley * 28514d90bb14SPeter Hurley * Caller must hold uport->lock 2852027d7dacSJiri Slaby */ 2853027d7dacSJiri Slaby void uart_handle_cts_change(struct uart_port *uport, unsigned int status) 2854027d7dacSJiri Slaby { 28554d90bb14SPeter Hurley lockdep_assert_held_once(&uport->lock); 28564d90bb14SPeter Hurley 2857027d7dacSJiri Slaby uport->icount.cts++; 2858027d7dacSJiri Slaby 2859299245a1SPeter Hurley if (uart_cts_enabled(uport)) { 2860d01f4d18SPeter Hurley if (uport->hw_stopped) { 2861027d7dacSJiri Slaby if (status) { 2862d01f4d18SPeter Hurley uport->hw_stopped = 0; 2863027d7dacSJiri Slaby uport->ops->start_tx(uport); 2864027d7dacSJiri Slaby uart_write_wakeup(uport); 2865027d7dacSJiri Slaby } 2866027d7dacSJiri Slaby } else { 2867027d7dacSJiri Slaby if (!status) { 2868d01f4d18SPeter Hurley uport->hw_stopped = 1; 2869027d7dacSJiri Slaby uport->ops->stop_tx(uport); 2870027d7dacSJiri Slaby } 2871027d7dacSJiri Slaby } 2872027d7dacSJiri Slaby } 2873027d7dacSJiri Slaby } 2874027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_handle_cts_change); 2875027d7dacSJiri Slaby 2876cf75525fSJiri Slaby /** 2877cf75525fSJiri Slaby * uart_insert_char - push a char to the uart layer 2878cf75525fSJiri Slaby * 2879cf75525fSJiri Slaby * User is responsible to call tty_flip_buffer_push when they are done with 2880cf75525fSJiri Slaby * insertion. 2881cf75525fSJiri Slaby * 2882cf75525fSJiri Slaby * @port: corresponding port 2883cf75525fSJiri Slaby * @status: state of the serial port RX buffer (LSR for 8250) 2884cf75525fSJiri Slaby * @overrun: mask of overrun bits in @status 2885cf75525fSJiri Slaby * @ch: character to push 2886cf75525fSJiri Slaby * @flag: flag for the character (see TTY_NORMAL and friends) 2887cf75525fSJiri Slaby */ 2888027d7dacSJiri Slaby void uart_insert_char(struct uart_port *port, unsigned int status, 2889027d7dacSJiri Slaby unsigned int overrun, unsigned int ch, unsigned int flag) 2890027d7dacSJiri Slaby { 289192a19f9cSJiri Slaby struct tty_port *tport = &port->state->port; 2892027d7dacSJiri Slaby 2893027d7dacSJiri Slaby if ((status & port->ignore_status_mask & ~overrun) == 0) 289492a19f9cSJiri Slaby if (tty_insert_flip_char(tport, ch, flag) == 0) 2895dabfb351SCorbin ++port->icount.buf_overrun; 2896027d7dacSJiri Slaby 2897027d7dacSJiri Slaby /* 2898027d7dacSJiri Slaby * Overrun is special. Since it's reported immediately, 2899027d7dacSJiri Slaby * it doesn't affect the current character. 2900027d7dacSJiri Slaby */ 2901027d7dacSJiri Slaby if (status & ~port->ignore_status_mask & overrun) 290292a19f9cSJiri Slaby if (tty_insert_flip_char(tport, 0, TTY_OVERRUN) == 0) 2903dabfb351SCorbin ++port->icount.buf_overrun; 2904027d7dacSJiri Slaby } 2905027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_insert_char); 2906027d7dacSJiri Slaby 2907ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_write_wakeup); 2908ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_register_driver); 2909ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_unregister_driver); 2910ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_suspend_port); 2911ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_resume_port); 2912ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_add_one_port); 2913ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_remove_one_port); 2914ab4382d2SGreg Kroah-Hartman 2915ab4382d2SGreg Kroah-Hartman MODULE_DESCRIPTION("Serial driver core"); 2916ab4382d2SGreg Kroah-Hartman MODULE_LICENSE("GPL"); 2917