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 { 1158a5f276f1SRicardo Ribalda Delgado if (copy_to_user(rs485, &port->rs485, sizeof(port->rs485))) 1159a5f276f1SRicardo Ribalda Delgado return -EFAULT; 1160a5f276f1SRicardo Ribalda Delgado return 0; 1161a5f276f1SRicardo Ribalda Delgado } 1162a5f276f1SRicardo Ribalda Delgado 1163a5f276f1SRicardo Ribalda Delgado static int uart_set_rs485_config(struct uart_port *port, 1164a5f276f1SRicardo Ribalda Delgado struct serial_rs485 __user *rs485_user) 1165a5f276f1SRicardo Ribalda Delgado { 1166a5f276f1SRicardo Ribalda Delgado struct serial_rs485 rs485; 1167a5f276f1SRicardo Ribalda Delgado int ret; 1168a5f276f1SRicardo Ribalda Delgado 1169a5f276f1SRicardo Ribalda Delgado if (!port->rs485_config) 1170a5f276f1SRicardo Ribalda Delgado return -ENOIOCTLCMD; 1171a5f276f1SRicardo Ribalda Delgado 1172a5f276f1SRicardo Ribalda Delgado if (copy_from_user(&rs485, rs485_user, sizeof(*rs485_user))) 1173a5f276f1SRicardo Ribalda Delgado return -EFAULT; 1174a5f276f1SRicardo Ribalda Delgado 1175a5f276f1SRicardo Ribalda Delgado ret = port->rs485_config(port, &rs485); 1176a5f276f1SRicardo Ribalda Delgado if (ret) 1177a5f276f1SRicardo Ribalda Delgado return ret; 1178a5f276f1SRicardo Ribalda Delgado 1179a5f276f1SRicardo Ribalda Delgado if (copy_to_user(rs485_user, &port->rs485, sizeof(port->rs485))) 1180a5f276f1SRicardo Ribalda Delgado return -EFAULT; 1181a5f276f1SRicardo Ribalda Delgado 1182a5f276f1SRicardo Ribalda Delgado return 0; 1183a5f276f1SRicardo Ribalda Delgado } 1184a5f276f1SRicardo Ribalda Delgado 1185ab4382d2SGreg Kroah-Hartman /* 1186ab4382d2SGreg Kroah-Hartman * Called via sys_ioctl. We can use spin_lock_irq() here. 1187ab4382d2SGreg Kroah-Hartman */ 1188ab4382d2SGreg Kroah-Hartman static int 11896caa76b7SAlan Cox uart_ioctl(struct tty_struct *tty, unsigned int cmd, 1190ab4382d2SGreg Kroah-Hartman unsigned long arg) 1191ab4382d2SGreg Kroah-Hartman { 1192ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1193ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1194ab4382d2SGreg Kroah-Hartman void __user *uarg = (void __user *)arg; 1195ab4382d2SGreg Kroah-Hartman int ret = -ENOIOCTLCMD; 1196ab4382d2SGreg Kroah-Hartman 1197ab4382d2SGreg Kroah-Hartman 1198ab4382d2SGreg Kroah-Hartman /* 1199ab4382d2SGreg Kroah-Hartman * These ioctls don't rely on the hardware to be present. 1200ab4382d2SGreg Kroah-Hartman */ 1201ab4382d2SGreg Kroah-Hartman switch (cmd) { 1202ab4382d2SGreg Kroah-Hartman case TIOCGSERIAL: 12039f109694SAlan Cox ret = uart_get_info_user(port, uarg); 1204ab4382d2SGreg Kroah-Hartman break; 1205ab4382d2SGreg Kroah-Hartman 1206ab4382d2SGreg Kroah-Hartman case TIOCSSERIAL: 12077c8ab967SPeter Hurley down_write(&tty->termios_rwsem); 12087ba2e769SAlan Cox ret = uart_set_info_user(tty, state, uarg); 12097c8ab967SPeter Hurley up_write(&tty->termios_rwsem); 1210ab4382d2SGreg Kroah-Hartman break; 1211ab4382d2SGreg Kroah-Hartman 1212ab4382d2SGreg Kroah-Hartman case TIOCSERCONFIG: 12137c8ab967SPeter Hurley down_write(&tty->termios_rwsem); 1214ab4382d2SGreg Kroah-Hartman ret = uart_do_autoconfig(tty, state); 12157c8ab967SPeter Hurley up_write(&tty->termios_rwsem); 1216ab4382d2SGreg Kroah-Hartman break; 1217ab4382d2SGreg Kroah-Hartman 1218ab4382d2SGreg Kroah-Hartman case TIOCSERGWILD: /* obsolete */ 1219ab4382d2SGreg Kroah-Hartman case TIOCSERSWILD: /* obsolete */ 1220ab4382d2SGreg Kroah-Hartman ret = 0; 1221ab4382d2SGreg Kroah-Hartman break; 1222ab4382d2SGreg Kroah-Hartman } 1223ab4382d2SGreg Kroah-Hartman 1224ab4382d2SGreg Kroah-Hartman if (ret != -ENOIOCTLCMD) 1225ab4382d2SGreg Kroah-Hartman goto out; 1226ab4382d2SGreg Kroah-Hartman 1227ab4382d2SGreg Kroah-Hartman if (tty->flags & (1 << TTY_IO_ERROR)) { 1228ab4382d2SGreg Kroah-Hartman ret = -EIO; 1229ab4382d2SGreg Kroah-Hartman goto out; 1230ab4382d2SGreg Kroah-Hartman } 1231ab4382d2SGreg Kroah-Hartman 1232ab4382d2SGreg Kroah-Hartman /* 1233ab4382d2SGreg Kroah-Hartman * The following should only be used when hardware is present. 1234ab4382d2SGreg Kroah-Hartman */ 1235ab4382d2SGreg Kroah-Hartman switch (cmd) { 1236ab4382d2SGreg Kroah-Hartman case TIOCMIWAIT: 1237ab4382d2SGreg Kroah-Hartman ret = uart_wait_modem_status(state, arg); 1238ab4382d2SGreg Kroah-Hartman break; 1239ab4382d2SGreg Kroah-Hartman } 1240ab4382d2SGreg Kroah-Hartman 1241ab4382d2SGreg Kroah-Hartman if (ret != -ENOIOCTLCMD) 1242ab4382d2SGreg Kroah-Hartman goto out; 1243ab4382d2SGreg Kroah-Hartman 1244ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1245ab4382d2SGreg Kroah-Hartman 12466caa76b7SAlan Cox if (tty->flags & (1 << TTY_IO_ERROR)) { 1247ab4382d2SGreg Kroah-Hartman ret = -EIO; 1248ab4382d2SGreg Kroah-Hartman goto out_up; 1249ab4382d2SGreg Kroah-Hartman } 1250ab4382d2SGreg Kroah-Hartman 1251ab4382d2SGreg Kroah-Hartman /* 1252ab4382d2SGreg Kroah-Hartman * All these rely on hardware being present and need to be 1253ab4382d2SGreg Kroah-Hartman * protected against the tty being hung up. 1254ab4382d2SGreg Kroah-Hartman */ 1255a9c20a9cSRicardo Ribalda Delgado 1256ab4382d2SGreg Kroah-Hartman switch (cmd) { 1257a9c20a9cSRicardo Ribalda Delgado case TIOCSERGETLSR: /* Get line status register */ 1258a9c20a9cSRicardo Ribalda Delgado ret = uart_get_lsr_info(tty, state, uarg); 1259a9c20a9cSRicardo Ribalda Delgado break; 1260a9c20a9cSRicardo Ribalda Delgado 1261a5f276f1SRicardo Ribalda Delgado case TIOCGRS485: 1262a5f276f1SRicardo Ribalda Delgado ret = uart_get_rs485_config(state->uart_port, uarg); 1263a5f276f1SRicardo Ribalda Delgado break; 1264a5f276f1SRicardo Ribalda Delgado 1265a5f276f1SRicardo Ribalda Delgado case TIOCSRS485: 1266a5f276f1SRicardo Ribalda Delgado ret = uart_set_rs485_config(state->uart_port, uarg); 1267a5f276f1SRicardo Ribalda Delgado break; 1268ab4382d2SGreg Kroah-Hartman default: { 1269ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1270ab4382d2SGreg Kroah-Hartman if (uport->ops->ioctl) 1271ab4382d2SGreg Kroah-Hartman ret = uport->ops->ioctl(uport, cmd, arg); 1272ab4382d2SGreg Kroah-Hartman break; 1273ab4382d2SGreg Kroah-Hartman } 1274ab4382d2SGreg Kroah-Hartman } 1275ab4382d2SGreg Kroah-Hartman out_up: 1276ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1277ab4382d2SGreg Kroah-Hartman out: 1278ab4382d2SGreg Kroah-Hartman return ret; 1279ab4382d2SGreg Kroah-Hartman } 1280ab4382d2SGreg Kroah-Hartman 1281ab4382d2SGreg Kroah-Hartman static void uart_set_ldisc(struct tty_struct *tty) 1282ab4382d2SGreg Kroah-Hartman { 1283ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1284ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1285ab4382d2SGreg Kroah-Hartman 1286db1b9dfcSPeter Hurley if (uport->ops->set_ldisc) { 1287db1b9dfcSPeter Hurley mutex_lock(&state->port.mutex); 1288732a84a0SPeter Hurley uport->ops->set_ldisc(uport, &tty->termios); 1289db1b9dfcSPeter Hurley mutex_unlock(&state->port.mutex); 1290db1b9dfcSPeter Hurley } 1291ab4382d2SGreg Kroah-Hartman } 1292ab4382d2SGreg Kroah-Hartman 1293ab4382d2SGreg Kroah-Hartman static void uart_set_termios(struct tty_struct *tty, 1294ab4382d2SGreg Kroah-Hartman struct ktermios *old_termios) 1295ab4382d2SGreg Kroah-Hartman { 1296ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1297dec94e70SRussell King struct uart_port *uport = state->uart_port; 1298adc8d746SAlan Cox unsigned int cflag = tty->termios.c_cflag; 12992cbacafdSRussell King unsigned int iflag_mask = IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK; 13002cbacafdSRussell King bool sw_changed = false; 1301ab4382d2SGreg Kroah-Hartman 13022cbacafdSRussell King /* 13032cbacafdSRussell King * Drivers doing software flow control also need to know 13042cbacafdSRussell King * about changes to these input settings. 13052cbacafdSRussell King */ 13062cbacafdSRussell King if (uport->flags & UPF_SOFT_FLOW) { 13072cbacafdSRussell King iflag_mask |= IXANY|IXON|IXOFF; 13082cbacafdSRussell King sw_changed = 13092cbacafdSRussell King tty->termios.c_cc[VSTART] != old_termios->c_cc[VSTART] || 13102cbacafdSRussell King tty->termios.c_cc[VSTOP] != old_termios->c_cc[VSTOP]; 13112cbacafdSRussell King } 1312ab4382d2SGreg Kroah-Hartman 1313ab4382d2SGreg Kroah-Hartman /* 1314ab4382d2SGreg Kroah-Hartman * These are the bits that are used to setup various 1315ab4382d2SGreg Kroah-Hartman * flags in the low level driver. We can ignore the Bfoo 1316ab4382d2SGreg Kroah-Hartman * bits in c_cflag; c_[io]speed will always be set 1317ab4382d2SGreg Kroah-Hartman * appropriately by set_termios() in tty_ioctl.c 1318ab4382d2SGreg Kroah-Hartman */ 1319ab4382d2SGreg Kroah-Hartman if ((cflag ^ old_termios->c_cflag) == 0 && 1320adc8d746SAlan Cox tty->termios.c_ospeed == old_termios->c_ospeed && 1321adc8d746SAlan Cox tty->termios.c_ispeed == old_termios->c_ispeed && 13222cbacafdSRussell King ((tty->termios.c_iflag ^ old_termios->c_iflag) & iflag_mask) == 0 && 13232cbacafdSRussell King !sw_changed) { 1324ab4382d2SGreg Kroah-Hartman return; 1325ab4382d2SGreg Kroah-Hartman } 1326ab4382d2SGreg Kroah-Hartman 13277c8ab967SPeter Hurley mutex_lock(&state->port.mutex); 1328ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, old_termios); 13297c8ab967SPeter Hurley mutex_unlock(&state->port.mutex); 1330c18b55fdSPeter Hurley /* reload cflag from termios; port driver may have overriden flags */ 1331c18b55fdSPeter Hurley cflag = tty->termios.c_cflag; 1332ab4382d2SGreg Kroah-Hartman 1333ab4382d2SGreg Kroah-Hartman /* Handle transition to B0 status */ 1334ab4382d2SGreg Kroah-Hartman if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) 1335dec94e70SRussell King uart_clear_mctrl(uport, TIOCM_RTS | TIOCM_DTR); 1336ab4382d2SGreg Kroah-Hartman /* Handle transition away from B0 status */ 1337ab4382d2SGreg Kroah-Hartman else if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { 1338ab4382d2SGreg Kroah-Hartman unsigned int mask = TIOCM_DTR; 133999abf3b9SPeter Hurley if (!(cflag & CRTSCTS) || !test_bit(TTY_THROTTLED, &tty->flags)) 1340ab4382d2SGreg Kroah-Hartman mask |= TIOCM_RTS; 1341dec94e70SRussell King uart_set_mctrl(uport, mask); 1342ab4382d2SGreg Kroah-Hartman } 1343ab4382d2SGreg Kroah-Hartman 1344dba05832SRussell King /* 1345dba05832SRussell King * If the port is doing h/w assisted flow control, do nothing. 1346d01f4d18SPeter Hurley * We assume that port->hw_stopped has never been set. 1347dba05832SRussell King */ 1348dba05832SRussell King if (uport->flags & UPF_HARD_FLOW) 1349dba05832SRussell King return; 1350dba05832SRussell King 1351ab4382d2SGreg Kroah-Hartman /* Handle turning off CRTSCTS */ 1352ab4382d2SGreg Kroah-Hartman if ((old_termios->c_cflag & CRTSCTS) && !(cflag & CRTSCTS)) { 1353938f7e13SPeter Hurley spin_lock_irq(&uport->lock); 1354d01f4d18SPeter Hurley uport->hw_stopped = 0; 1355ab4382d2SGreg Kroah-Hartman __uart_start(tty); 1356938f7e13SPeter Hurley spin_unlock_irq(&uport->lock); 1357ab4382d2SGreg Kroah-Hartman } 1358ab4382d2SGreg Kroah-Hartman /* Handle turning on CRTSCTS */ 1359ab4382d2SGreg Kroah-Hartman else if (!(old_termios->c_cflag & CRTSCTS) && (cflag & CRTSCTS)) { 1360938f7e13SPeter Hurley spin_lock_irq(&uport->lock); 1361dec94e70SRussell King if (!(uport->ops->get_mctrl(uport) & TIOCM_CTS)) { 1362d01f4d18SPeter Hurley uport->hw_stopped = 1; 1363dec94e70SRussell King uport->ops->stop_tx(uport); 1364ab4382d2SGreg Kroah-Hartman } 1365938f7e13SPeter Hurley spin_unlock_irq(&uport->lock); 1366ab4382d2SGreg Kroah-Hartman } 1367ab4382d2SGreg Kroah-Hartman } 1368ab4382d2SGreg Kroah-Hartman 1369ab4382d2SGreg Kroah-Hartman /* 1370ef4f527cSKevin Cernekee * Calls to uart_close() are serialised via the tty_lock in 1371ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:tty_release() 1372ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:do_tty_hangup() 1373ef4f527cSKevin Cernekee * This runs from a workqueue and can sleep for a _short_ time only. 1374ab4382d2SGreg Kroah-Hartman */ 1375ab4382d2SGreg Kroah-Hartman static void uart_close(struct tty_struct *tty, struct file *filp) 1376ab4382d2SGreg Kroah-Hartman { 1377ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1378ab4382d2SGreg Kroah-Hartman struct tty_port *port; 1379ab4382d2SGreg Kroah-Hartman struct uart_port *uport; 1380ab4382d2SGreg Kroah-Hartman unsigned long flags; 1381ab4382d2SGreg Kroah-Hartman 138291b32f54SPeter Hurley if (!state) { 138391b32f54SPeter Hurley struct uart_driver *drv = tty->driver->driver_state; 138491b32f54SPeter Hurley 138591b32f54SPeter Hurley state = drv->state + tty->index; 138691b32f54SPeter Hurley port = &state->port; 138791b32f54SPeter Hurley spin_lock_irq(&port->lock); 138891b32f54SPeter Hurley --port->count; 138991b32f54SPeter Hurley spin_unlock_irq(&port->lock); 1390ab4382d2SGreg Kroah-Hartman return; 139191b32f54SPeter Hurley } 1392ab4382d2SGreg Kroah-Hartman 1393ab4382d2SGreg Kroah-Hartman uport = state->uart_port; 1394ab4382d2SGreg Kroah-Hartman port = &state->port; 1395ab4382d2SGreg Kroah-Hartman 13964ed94cd4SGeert Uytterhoeven pr_debug("uart_close(%d) called\n", uport ? uport->line : -1); 1397ab4382d2SGreg Kroah-Hartman 13984ed94cd4SGeert Uytterhoeven if (!port->count || tty_port_close_start(port, tty, filp) == 0) 139955956216SNobuhiro Iwamatsu return; 1400ab4382d2SGreg Kroah-Hartman 1401ab4382d2SGreg Kroah-Hartman /* 1402ab4382d2SGreg Kroah-Hartman * At this point, we stop accepting input. To do this, we 1403ab4382d2SGreg Kroah-Hartman * disable the receive line status interrupts. 1404ab4382d2SGreg Kroah-Hartman */ 1405ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_INITIALIZED) { 1406ab4382d2SGreg Kroah-Hartman unsigned long flags; 1407ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&uport->lock, flags); 1408ab4382d2SGreg Kroah-Hartman uport->ops->stop_rx(uport); 1409ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&uport->lock, flags); 1410ab4382d2SGreg Kroah-Hartman /* 1411ab4382d2SGreg Kroah-Hartman * Before we drop DTR, make sure the UART transmitter 1412ab4382d2SGreg Kroah-Hartman * has completely drained; this is especially 1413ab4382d2SGreg Kroah-Hartman * important if there is a transmit FIFO! 1414ab4382d2SGreg Kroah-Hartman */ 14151f33a51dSJiri Slaby uart_wait_until_sent(tty, uport->timeout); 1416ab4382d2SGreg Kroah-Hartman } 1417ab4382d2SGreg Kroah-Hartman 1418bafb0bd2SJiri Slaby mutex_lock(&port->mutex); 1419ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 1420ab4382d2SGreg Kroah-Hartman tty_port_tty_set(port, NULL); 1421ab4382d2SGreg Kroah-Hartman tty->closing = 0; 1422ddc7b758SPeter Hurley spin_lock_irqsave(&port->lock, flags); 1423ab4382d2SGreg Kroah-Hartman 1424ab4382d2SGreg Kroah-Hartman if (port->blocked_open) { 1425ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 1426ab4382d2SGreg Kroah-Hartman if (port->close_delay) 142774866e75SPeter Hurley msleep_interruptible(jiffies_to_msecs(port->close_delay)); 1428ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 1429ab4382d2SGreg Kroah-Hartman } else if (!uart_console(uport)) { 1430ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 14316f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_OFF); 1432ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 1433ab4382d2SGreg Kroah-Hartman } 1434ab4382d2SGreg Kroah-Hartman 1435ab4382d2SGreg Kroah-Hartman /* 1436ab4382d2SGreg Kroah-Hartman * Wake up anyone trying to open this port. 1437ab4382d2SGreg Kroah-Hartman */ 1438ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); 1439426929f8SJiri Slaby clear_bit(ASYNCB_CLOSING, &port->flags); 1440ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 1441ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->open_wait); 1442426929f8SJiri Slaby wake_up_interruptible(&port->close_wait); 1443ab4382d2SGreg Kroah-Hartman 1444ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 14452e758910SPeter Hurley 14462e758910SPeter Hurley tty_ldisc_flush(tty); 1447ab4382d2SGreg Kroah-Hartman } 1448ab4382d2SGreg Kroah-Hartman 14491f33a51dSJiri Slaby static void uart_wait_until_sent(struct tty_struct *tty, int timeout) 1450ab4382d2SGreg Kroah-Hartman { 14511f33a51dSJiri Slaby struct uart_state *state = tty->driver_data; 14521f33a51dSJiri Slaby struct uart_port *port = state->uart_port; 1453ab4382d2SGreg Kroah-Hartman unsigned long char_time, expire; 1454ab4382d2SGreg Kroah-Hartman 1455ab4382d2SGreg Kroah-Hartman if (port->type == PORT_UNKNOWN || port->fifosize == 0) 1456ab4382d2SGreg Kroah-Hartman return; 1457ab4382d2SGreg Kroah-Hartman 1458ab4382d2SGreg Kroah-Hartman /* 1459ab4382d2SGreg Kroah-Hartman * Set the check interval to be 1/5 of the estimated time to 1460ab4382d2SGreg Kroah-Hartman * send a single character, and make it at least 1. The check 1461ab4382d2SGreg Kroah-Hartman * interval should also be less than the timeout. 1462ab4382d2SGreg Kroah-Hartman * 1463ab4382d2SGreg Kroah-Hartman * Note: we have to use pretty tight timings here to satisfy 1464ab4382d2SGreg Kroah-Hartman * the NIST-PCTS. 1465ab4382d2SGreg Kroah-Hartman */ 1466ab4382d2SGreg Kroah-Hartman char_time = (port->timeout - HZ/50) / port->fifosize; 1467ab4382d2SGreg Kroah-Hartman char_time = char_time / 5; 1468ab4382d2SGreg Kroah-Hartman if (char_time == 0) 1469ab4382d2SGreg Kroah-Hartman char_time = 1; 1470ab4382d2SGreg Kroah-Hartman if (timeout && timeout < char_time) 1471ab4382d2SGreg Kroah-Hartman char_time = timeout; 1472ab4382d2SGreg Kroah-Hartman 1473ab4382d2SGreg Kroah-Hartman /* 1474ab4382d2SGreg Kroah-Hartman * If the transmitter hasn't cleared in twice the approximate 1475ab4382d2SGreg Kroah-Hartman * amount of time to send the entire FIFO, it probably won't 1476ab4382d2SGreg Kroah-Hartman * ever clear. This assumes the UART isn't doing flow 1477ab4382d2SGreg Kroah-Hartman * control, which is currently the case. Hence, if it ever 1478ab4382d2SGreg Kroah-Hartman * takes longer than port->timeout, this is probably due to a 1479ab4382d2SGreg Kroah-Hartman * UART bug of some kind. So, we clamp the timeout parameter at 1480ab4382d2SGreg Kroah-Hartman * 2*port->timeout. 1481ab4382d2SGreg Kroah-Hartman */ 1482ab4382d2SGreg Kroah-Hartman if (timeout == 0 || timeout > 2 * port->timeout) 1483ab4382d2SGreg Kroah-Hartman timeout = 2 * port->timeout; 1484ab4382d2SGreg Kroah-Hartman 1485ab4382d2SGreg Kroah-Hartman expire = jiffies + timeout; 1486ab4382d2SGreg Kroah-Hartman 1487ab4382d2SGreg Kroah-Hartman pr_debug("uart_wait_until_sent(%d), jiffies=%lu, expire=%lu...\n", 1488ab4382d2SGreg Kroah-Hartman port->line, jiffies, expire); 1489ab4382d2SGreg Kroah-Hartman 1490ab4382d2SGreg Kroah-Hartman /* 1491ab4382d2SGreg Kroah-Hartman * Check whether the transmitter is empty every 'char_time'. 1492ab4382d2SGreg Kroah-Hartman * 'timeout' / 'expire' give us the maximum amount of time 1493ab4382d2SGreg Kroah-Hartman * we wait. 1494ab4382d2SGreg Kroah-Hartman */ 1495ab4382d2SGreg Kroah-Hartman while (!port->ops->tx_empty(port)) { 1496ab4382d2SGreg Kroah-Hartman msleep_interruptible(jiffies_to_msecs(char_time)); 1497ab4382d2SGreg Kroah-Hartman if (signal_pending(current)) 1498ab4382d2SGreg Kroah-Hartman break; 1499ab4382d2SGreg Kroah-Hartman if (time_after(jiffies, expire)) 1500ab4382d2SGreg Kroah-Hartman break; 1501ab4382d2SGreg Kroah-Hartman } 1502ab4382d2SGreg Kroah-Hartman } 1503ab4382d2SGreg Kroah-Hartman 1504ab4382d2SGreg Kroah-Hartman /* 1505ef4f527cSKevin Cernekee * Calls to uart_hangup() are serialised by the tty_lock in 1506ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:do_tty_hangup() 1507ef4f527cSKevin Cernekee * This runs from a workqueue and can sleep for a _short_ time only. 1508ab4382d2SGreg Kroah-Hartman */ 1509ab4382d2SGreg Kroah-Hartman static void uart_hangup(struct tty_struct *tty) 1510ab4382d2SGreg Kroah-Hartman { 1511ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1512ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1513ab4382d2SGreg Kroah-Hartman unsigned long flags; 1514ab4382d2SGreg Kroah-Hartman 1515ab4382d2SGreg Kroah-Hartman pr_debug("uart_hangup(%d)\n", state->uart_port->line); 1516ab4382d2SGreg Kroah-Hartman 1517ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1518ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_NORMAL_ACTIVE) { 1519ab4382d2SGreg Kroah-Hartman uart_flush_buffer(tty); 1520ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 1521ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 1522ab4382d2SGreg Kroah-Hartman port->count = 0; 1523ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); 1524ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 1525ab4382d2SGreg Kroah-Hartman tty_port_tty_set(port, NULL); 1526bf903c0cSGeert Uytterhoeven if (!uart_console(state->uart_port)) 1527bf903c0cSGeert Uytterhoeven uart_change_pm(state, UART_PM_STATE_OFF); 1528ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->open_wait); 1529ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->delta_msr_wait); 1530ab4382d2SGreg Kroah-Hartman } 1531ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1532ab4382d2SGreg Kroah-Hartman } 1533ab4382d2SGreg Kroah-Hartman 15340b1db830SJiri Slaby static int uart_port_activate(struct tty_port *port, struct tty_struct *tty) 15350b1db830SJiri Slaby { 15360b1db830SJiri Slaby return 0; 15370b1db830SJiri Slaby } 15380b1db830SJiri Slaby 15390b1db830SJiri Slaby static void uart_port_shutdown(struct tty_port *port) 15400b1db830SJiri Slaby { 1541b922e19dSJiri Slaby struct uart_state *state = container_of(port, struct uart_state, port); 1542b922e19dSJiri Slaby struct uart_port *uport = state->uart_port; 1543b922e19dSJiri Slaby 1544b922e19dSJiri Slaby /* 1545b922e19dSJiri Slaby * clear delta_msr_wait queue to avoid mem leaks: we may free 1546b922e19dSJiri Slaby * the irq here so the queue might never be woken up. Note 1547b922e19dSJiri Slaby * that we won't end up waiting on delta_msr_wait again since 1548b922e19dSJiri Slaby * any outstanding file descriptors should be pointing at 1549b922e19dSJiri Slaby * hung_up_tty_fops now. 1550b922e19dSJiri Slaby */ 1551b922e19dSJiri Slaby wake_up_interruptible(&port->delta_msr_wait); 1552b922e19dSJiri Slaby 1553b922e19dSJiri Slaby /* 1554b922e19dSJiri Slaby * Free the IRQ and disable the port. 1555b922e19dSJiri Slaby */ 1556b922e19dSJiri Slaby uport->ops->shutdown(uport); 1557b922e19dSJiri Slaby 1558b922e19dSJiri Slaby /* 1559b922e19dSJiri Slaby * Ensure that the IRQ handler isn't running on another CPU. 1560b922e19dSJiri Slaby */ 1561b922e19dSJiri Slaby synchronize_irq(uport->irq); 15620b1db830SJiri Slaby } 15630b1db830SJiri Slaby 1564ab4382d2SGreg Kroah-Hartman static int uart_carrier_raised(struct tty_port *port) 1565ab4382d2SGreg Kroah-Hartman { 1566ab4382d2SGreg Kroah-Hartman struct uart_state *state = container_of(port, struct uart_state, port); 1567ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1568ab4382d2SGreg Kroah-Hartman int mctrl; 1569ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 15701fdc3106SAlexander Shiyan uart_enable_ms(uport); 1571ab4382d2SGreg Kroah-Hartman mctrl = uport->ops->get_mctrl(uport); 1572ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1573ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_CAR) 1574ab4382d2SGreg Kroah-Hartman return 1; 1575ab4382d2SGreg Kroah-Hartman return 0; 1576ab4382d2SGreg Kroah-Hartman } 1577ab4382d2SGreg Kroah-Hartman 1578ab4382d2SGreg Kroah-Hartman static void uart_dtr_rts(struct tty_port *port, int onoff) 1579ab4382d2SGreg Kroah-Hartman { 1580ab4382d2SGreg Kroah-Hartman struct uart_state *state = container_of(port, struct uart_state, port); 1581ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1582ab4382d2SGreg Kroah-Hartman 15836f5c24adSJiri Slaby if (onoff) 1584ab4382d2SGreg Kroah-Hartman uart_set_mctrl(uport, TIOCM_DTR | TIOCM_RTS); 1585ab4382d2SGreg Kroah-Hartman else 1586ab4382d2SGreg Kroah-Hartman uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); 1587ab4382d2SGreg Kroah-Hartman } 1588ab4382d2SGreg Kroah-Hartman 1589ab4382d2SGreg Kroah-Hartman /* 1590ef4f527cSKevin Cernekee * Calls to uart_open are serialised by the tty_lock in 1591ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:tty_open() 1592ab4382d2SGreg Kroah-Hartman * Note that if this fails, then uart_close() _will_ be called. 1593ab4382d2SGreg Kroah-Hartman * 1594ab4382d2SGreg Kroah-Hartman * In time, we want to scrap the "opening nonpresent ports" 1595ab4382d2SGreg Kroah-Hartman * behaviour and implement an alternative way for setserial 1596ab4382d2SGreg Kroah-Hartman * to set base addresses/ports/types. This will allow us to 1597ab4382d2SGreg Kroah-Hartman * get rid of a certain amount of extra tests. 1598ab4382d2SGreg Kroah-Hartman */ 1599ab4382d2SGreg Kroah-Hartman static int uart_open(struct tty_struct *tty, struct file *filp) 1600ab4382d2SGreg Kroah-Hartman { 1601ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = (struct uart_driver *)tty->driver->driver_state; 1602ab4382d2SGreg Kroah-Hartman int retval, line = tty->index; 16031c7b13c4SJiri Slaby struct uart_state *state = drv->state + line; 16041c7b13c4SJiri Slaby struct tty_port *port = &state->port; 1605ab4382d2SGreg Kroah-Hartman 1606ab4382d2SGreg Kroah-Hartman pr_debug("uart_open(%d) called\n", line); 1607ab4382d2SGreg Kroah-Hartman 160891b32f54SPeter Hurley spin_lock_irq(&port->lock); 160991b32f54SPeter Hurley ++port->count; 161091b32f54SPeter Hurley spin_unlock_irq(&port->lock); 161191b32f54SPeter Hurley 1612ab4382d2SGreg Kroah-Hartman /* 16131c7b13c4SJiri Slaby * We take the semaphore here to guarantee that we won't be re-entered 16141c7b13c4SJiri Slaby * while allocating the state structure, or while we request any IRQs 16151c7b13c4SJiri Slaby * that the driver may need. This also has the nice side-effect that 16161c7b13c4SJiri Slaby * it delays the action of uart_hangup, so we can guarantee that 16171c7b13c4SJiri Slaby * state->port.tty will always contain something reasonable. 1618ab4382d2SGreg Kroah-Hartman */ 16191c7b13c4SJiri Slaby if (mutex_lock_interruptible(&port->mutex)) { 16201c7b13c4SJiri Slaby retval = -ERESTARTSYS; 16211c7b13c4SJiri Slaby goto end; 1622ab4382d2SGreg Kroah-Hartman } 16231c7b13c4SJiri Slaby 16241c7b13c4SJiri Slaby if (!state->uart_port || state->uart_port->flags & UPF_DEAD) { 16251c7b13c4SJiri Slaby retval = -ENXIO; 162691b32f54SPeter Hurley goto err_unlock; 16271c7b13c4SJiri Slaby } 1628ab4382d2SGreg Kroah-Hartman 1629ab4382d2SGreg Kroah-Hartman tty->driver_data = state; 1630ab4382d2SGreg Kroah-Hartman state->uart_port->state = state; 1631d6c53c0eSJiri Slaby state->port.low_latency = 1632d6c53c0eSJiri Slaby (state->uart_port->flags & UPF_LOW_LATENCY) ? 1 : 0; 1633ab4382d2SGreg Kroah-Hartman tty_port_tty_set(port, tty); 1634ab4382d2SGreg Kroah-Hartman 1635ab4382d2SGreg Kroah-Hartman /* 1636ab4382d2SGreg Kroah-Hartman * Start up the serial port. 1637ab4382d2SGreg Kroah-Hartman */ 1638ab4382d2SGreg Kroah-Hartman retval = uart_startup(tty, state, 0); 1639ab4382d2SGreg Kroah-Hartman 1640ab4382d2SGreg Kroah-Hartman /* 1641ab4382d2SGreg Kroah-Hartman * If we succeeded, wait until the port is ready. 1642ab4382d2SGreg Kroah-Hartman */ 1643ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1644ab4382d2SGreg Kroah-Hartman if (retval == 0) 1645ab4382d2SGreg Kroah-Hartman retval = tty_port_block_til_ready(port, tty, filp); 1646ab4382d2SGreg Kroah-Hartman 16471c7b13c4SJiri Slaby end: 1648ab4382d2SGreg Kroah-Hartman return retval; 164991b32f54SPeter Hurley err_unlock: 16501c7b13c4SJiri Slaby mutex_unlock(&port->mutex); 16511c7b13c4SJiri Slaby goto end; 1652ab4382d2SGreg Kroah-Hartman } 1653ab4382d2SGreg Kroah-Hartman 1654ab4382d2SGreg Kroah-Hartman static const char *uart_type(struct uart_port *port) 1655ab4382d2SGreg Kroah-Hartman { 1656ab4382d2SGreg Kroah-Hartman const char *str = NULL; 1657ab4382d2SGreg Kroah-Hartman 1658ab4382d2SGreg Kroah-Hartman if (port->ops->type) 1659ab4382d2SGreg Kroah-Hartman str = port->ops->type(port); 1660ab4382d2SGreg Kroah-Hartman 1661ab4382d2SGreg Kroah-Hartman if (!str) 1662ab4382d2SGreg Kroah-Hartman str = "unknown"; 1663ab4382d2SGreg Kroah-Hartman 1664ab4382d2SGreg Kroah-Hartman return str; 1665ab4382d2SGreg Kroah-Hartman } 1666ab4382d2SGreg Kroah-Hartman 1667ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_PROC_FS 1668ab4382d2SGreg Kroah-Hartman 1669ab4382d2SGreg Kroah-Hartman static void uart_line_info(struct seq_file *m, struct uart_driver *drv, int i) 1670ab4382d2SGreg Kroah-Hartman { 1671ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + i; 1672ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 16736f538fe3SLinus Walleij enum uart_pm_state pm_state; 1674ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1675ab4382d2SGreg Kroah-Hartman char stat_buf[32]; 1676ab4382d2SGreg Kroah-Hartman unsigned int status; 1677ab4382d2SGreg Kroah-Hartman int mmio; 1678ab4382d2SGreg Kroah-Hartman 1679ab4382d2SGreg Kroah-Hartman if (!uport) 1680ab4382d2SGreg Kroah-Hartman return; 1681ab4382d2SGreg Kroah-Hartman 1682ab4382d2SGreg Kroah-Hartman mmio = uport->iotype >= UPIO_MEM; 1683ab4382d2SGreg Kroah-Hartman seq_printf(m, "%d: uart:%s %s%08llX irq:%d", 1684ab4382d2SGreg Kroah-Hartman uport->line, uart_type(uport), 1685ab4382d2SGreg Kroah-Hartman mmio ? "mmio:0x" : "port:", 1686ab4382d2SGreg Kroah-Hartman mmio ? (unsigned long long)uport->mapbase 1687ab4382d2SGreg Kroah-Hartman : (unsigned long long)uport->iobase, 1688ab4382d2SGreg Kroah-Hartman uport->irq); 1689ab4382d2SGreg Kroah-Hartman 1690ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) { 1691ab4382d2SGreg Kroah-Hartman seq_putc(m, '\n'); 1692ab4382d2SGreg Kroah-Hartman return; 1693ab4382d2SGreg Kroah-Hartman } 1694ab4382d2SGreg Kroah-Hartman 1695ab4382d2SGreg Kroah-Hartman if (capable(CAP_SYS_ADMIN)) { 1696ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1697ab4382d2SGreg Kroah-Hartman pm_state = state->pm_state; 16986f538fe3SLinus Walleij if (pm_state != UART_PM_STATE_ON) 16996f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 1700ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1701ab4382d2SGreg Kroah-Hartman status = uport->ops->get_mctrl(uport); 1702ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 17036f538fe3SLinus Walleij if (pm_state != UART_PM_STATE_ON) 1704ab4382d2SGreg Kroah-Hartman uart_change_pm(state, pm_state); 1705ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1706ab4382d2SGreg Kroah-Hartman 1707ab4382d2SGreg Kroah-Hartman seq_printf(m, " tx:%d rx:%d", 1708ab4382d2SGreg Kroah-Hartman uport->icount.tx, uport->icount.rx); 1709ab4382d2SGreg Kroah-Hartman if (uport->icount.frame) 1710ab4382d2SGreg Kroah-Hartman seq_printf(m, " fe:%d", 1711ab4382d2SGreg Kroah-Hartman uport->icount.frame); 1712ab4382d2SGreg Kroah-Hartman if (uport->icount.parity) 1713ab4382d2SGreg Kroah-Hartman seq_printf(m, " pe:%d", 1714ab4382d2SGreg Kroah-Hartman uport->icount.parity); 1715ab4382d2SGreg Kroah-Hartman if (uport->icount.brk) 1716ab4382d2SGreg Kroah-Hartman seq_printf(m, " brk:%d", 1717ab4382d2SGreg Kroah-Hartman uport->icount.brk); 1718ab4382d2SGreg Kroah-Hartman if (uport->icount.overrun) 1719ab4382d2SGreg Kroah-Hartman seq_printf(m, " oe:%d", 1720ab4382d2SGreg Kroah-Hartman uport->icount.overrun); 1721ab4382d2SGreg Kroah-Hartman 1722ab4382d2SGreg Kroah-Hartman #define INFOBIT(bit, str) \ 1723ab4382d2SGreg Kroah-Hartman if (uport->mctrl & (bit)) \ 1724ab4382d2SGreg Kroah-Hartman strncat(stat_buf, (str), sizeof(stat_buf) - \ 1725ab4382d2SGreg Kroah-Hartman strlen(stat_buf) - 2) 1726ab4382d2SGreg Kroah-Hartman #define STATBIT(bit, str) \ 1727ab4382d2SGreg Kroah-Hartman if (status & (bit)) \ 1728ab4382d2SGreg Kroah-Hartman strncat(stat_buf, (str), sizeof(stat_buf) - \ 1729ab4382d2SGreg Kroah-Hartman strlen(stat_buf) - 2) 1730ab4382d2SGreg Kroah-Hartman 1731ab4382d2SGreg Kroah-Hartman stat_buf[0] = '\0'; 1732ab4382d2SGreg Kroah-Hartman stat_buf[1] = '\0'; 1733ab4382d2SGreg Kroah-Hartman INFOBIT(TIOCM_RTS, "|RTS"); 1734ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_CTS, "|CTS"); 1735ab4382d2SGreg Kroah-Hartman INFOBIT(TIOCM_DTR, "|DTR"); 1736ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_DSR, "|DSR"); 1737ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_CAR, "|CD"); 1738ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_RNG, "|RI"); 1739ab4382d2SGreg Kroah-Hartman if (stat_buf[0]) 1740ab4382d2SGreg Kroah-Hartman stat_buf[0] = ' '; 1741ab4382d2SGreg Kroah-Hartman 1742ab4382d2SGreg Kroah-Hartman seq_puts(m, stat_buf); 1743ab4382d2SGreg Kroah-Hartman } 1744ab4382d2SGreg Kroah-Hartman seq_putc(m, '\n'); 1745ab4382d2SGreg Kroah-Hartman #undef STATBIT 1746ab4382d2SGreg Kroah-Hartman #undef INFOBIT 1747ab4382d2SGreg Kroah-Hartman } 1748ab4382d2SGreg Kroah-Hartman 1749ab4382d2SGreg Kroah-Hartman static int uart_proc_show(struct seq_file *m, void *v) 1750ab4382d2SGreg Kroah-Hartman { 1751ab4382d2SGreg Kroah-Hartman struct tty_driver *ttydrv = m->private; 1752ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = ttydrv->driver_state; 1753ab4382d2SGreg Kroah-Hartman int i; 1754ab4382d2SGreg Kroah-Hartman 1755ab4382d2SGreg Kroah-Hartman seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n", 1756ab4382d2SGreg Kroah-Hartman "", "", ""); 1757ab4382d2SGreg Kroah-Hartman for (i = 0; i < drv->nr; i++) 1758ab4382d2SGreg Kroah-Hartman uart_line_info(m, drv, i); 1759ab4382d2SGreg Kroah-Hartman return 0; 1760ab4382d2SGreg Kroah-Hartman } 1761ab4382d2SGreg Kroah-Hartman 1762ab4382d2SGreg Kroah-Hartman static int uart_proc_open(struct inode *inode, struct file *file) 1763ab4382d2SGreg Kroah-Hartman { 1764d9dda78bSAl Viro return single_open(file, uart_proc_show, PDE_DATA(inode)); 1765ab4382d2SGreg Kroah-Hartman } 1766ab4382d2SGreg Kroah-Hartman 1767ab4382d2SGreg Kroah-Hartman static const struct file_operations uart_proc_fops = { 1768ab4382d2SGreg Kroah-Hartman .owner = THIS_MODULE, 1769ab4382d2SGreg Kroah-Hartman .open = uart_proc_open, 1770ab4382d2SGreg Kroah-Hartman .read = seq_read, 1771ab4382d2SGreg Kroah-Hartman .llseek = seq_lseek, 1772ab4382d2SGreg Kroah-Hartman .release = single_release, 1773ab4382d2SGreg Kroah-Hartman }; 1774ab4382d2SGreg Kroah-Hartman #endif 1775ab4382d2SGreg Kroah-Hartman 1776ab4382d2SGreg Kroah-Hartman #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL) 1777ab4382d2SGreg Kroah-Hartman /* 1778ab4382d2SGreg Kroah-Hartman * uart_console_write - write a console message to a serial port 1779ab4382d2SGreg Kroah-Hartman * @port: the port to write the message 1780ab4382d2SGreg Kroah-Hartman * @s: array of characters 1781ab4382d2SGreg Kroah-Hartman * @count: number of characters in string to write 1782ab4382d2SGreg Kroah-Hartman * @write: function to write character to port 1783ab4382d2SGreg Kroah-Hartman */ 1784ab4382d2SGreg Kroah-Hartman void uart_console_write(struct uart_port *port, const char *s, 1785ab4382d2SGreg Kroah-Hartman unsigned int count, 1786ab4382d2SGreg Kroah-Hartman void (*putchar)(struct uart_port *, int)) 1787ab4382d2SGreg Kroah-Hartman { 1788ab4382d2SGreg Kroah-Hartman unsigned int i; 1789ab4382d2SGreg Kroah-Hartman 1790ab4382d2SGreg Kroah-Hartman for (i = 0; i < count; i++, s++) { 1791ab4382d2SGreg Kroah-Hartman if (*s == '\n') 1792ab4382d2SGreg Kroah-Hartman putchar(port, '\r'); 1793ab4382d2SGreg Kroah-Hartman putchar(port, *s); 1794ab4382d2SGreg Kroah-Hartman } 1795ab4382d2SGreg Kroah-Hartman } 1796ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_console_write); 1797ab4382d2SGreg Kroah-Hartman 1798ab4382d2SGreg Kroah-Hartman /* 1799ab4382d2SGreg Kroah-Hartman * Check whether an invalid uart number has been specified, and 1800ab4382d2SGreg Kroah-Hartman * if so, search for the first available port that does have 1801ab4382d2SGreg Kroah-Hartman * console support. 1802ab4382d2SGreg Kroah-Hartman */ 1803ab4382d2SGreg Kroah-Hartman struct uart_port * __init 1804ab4382d2SGreg Kroah-Hartman uart_get_console(struct uart_port *ports, int nr, struct console *co) 1805ab4382d2SGreg Kroah-Hartman { 1806ab4382d2SGreg Kroah-Hartman int idx = co->index; 1807ab4382d2SGreg Kroah-Hartman 1808ab4382d2SGreg Kroah-Hartman if (idx < 0 || idx >= nr || (ports[idx].iobase == 0 && 1809ab4382d2SGreg Kroah-Hartman ports[idx].membase == NULL)) 1810ab4382d2SGreg Kroah-Hartman for (idx = 0; idx < nr; idx++) 1811ab4382d2SGreg Kroah-Hartman if (ports[idx].iobase != 0 || 1812ab4382d2SGreg Kroah-Hartman ports[idx].membase != NULL) 1813ab4382d2SGreg Kroah-Hartman break; 1814ab4382d2SGreg Kroah-Hartman 1815ab4382d2SGreg Kroah-Hartman co->index = idx; 1816ab4382d2SGreg Kroah-Hartman 1817ab4382d2SGreg Kroah-Hartman return ports + idx; 1818ab4382d2SGreg Kroah-Hartman } 1819ab4382d2SGreg Kroah-Hartman 1820ab4382d2SGreg Kroah-Hartman /** 182102088ca6SGeert Uytterhoeven * uart_parse_options - Parse serial port baud/parity/bits/flow control. 1822ab4382d2SGreg Kroah-Hartman * @options: pointer to option string 1823ab4382d2SGreg Kroah-Hartman * @baud: pointer to an 'int' variable for the baud rate. 1824ab4382d2SGreg Kroah-Hartman * @parity: pointer to an 'int' variable for the parity. 1825ab4382d2SGreg Kroah-Hartman * @bits: pointer to an 'int' variable for the number of data bits. 1826ab4382d2SGreg Kroah-Hartman * @flow: pointer to an 'int' variable for the flow control character. 1827ab4382d2SGreg Kroah-Hartman * 1828ab4382d2SGreg Kroah-Hartman * uart_parse_options decodes a string containing the serial console 1829ab4382d2SGreg Kroah-Hartman * options. The format of the string is <baud><parity><bits><flow>, 1830ab4382d2SGreg Kroah-Hartman * eg: 115200n8r 1831ab4382d2SGreg Kroah-Hartman */ 1832ab4382d2SGreg Kroah-Hartman void 1833ab4382d2SGreg Kroah-Hartman uart_parse_options(char *options, int *baud, int *parity, int *bits, int *flow) 1834ab4382d2SGreg Kroah-Hartman { 1835ab4382d2SGreg Kroah-Hartman char *s = options; 1836ab4382d2SGreg Kroah-Hartman 1837ab4382d2SGreg Kroah-Hartman *baud = simple_strtoul(s, NULL, 10); 1838ab4382d2SGreg Kroah-Hartman while (*s >= '0' && *s <= '9') 1839ab4382d2SGreg Kroah-Hartman s++; 1840ab4382d2SGreg Kroah-Hartman if (*s) 1841ab4382d2SGreg Kroah-Hartman *parity = *s++; 1842ab4382d2SGreg Kroah-Hartman if (*s) 1843ab4382d2SGreg Kroah-Hartman *bits = *s++ - '0'; 1844ab4382d2SGreg Kroah-Hartman if (*s) 1845ab4382d2SGreg Kroah-Hartman *flow = *s; 1846ab4382d2SGreg Kroah-Hartman } 1847ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_parse_options); 1848ab4382d2SGreg Kroah-Hartman 1849ab4382d2SGreg Kroah-Hartman struct baud_rates { 1850ab4382d2SGreg Kroah-Hartman unsigned int rate; 1851ab4382d2SGreg Kroah-Hartman unsigned int cflag; 1852ab4382d2SGreg Kroah-Hartman }; 1853ab4382d2SGreg Kroah-Hartman 1854ab4382d2SGreg Kroah-Hartman static const struct baud_rates baud_rates[] = { 1855ab4382d2SGreg Kroah-Hartman { 921600, B921600 }, 1856ab4382d2SGreg Kroah-Hartman { 460800, B460800 }, 1857ab4382d2SGreg Kroah-Hartman { 230400, B230400 }, 1858ab4382d2SGreg Kroah-Hartman { 115200, B115200 }, 1859ab4382d2SGreg Kroah-Hartman { 57600, B57600 }, 1860ab4382d2SGreg Kroah-Hartman { 38400, B38400 }, 1861ab4382d2SGreg Kroah-Hartman { 19200, B19200 }, 1862ab4382d2SGreg Kroah-Hartman { 9600, B9600 }, 1863ab4382d2SGreg Kroah-Hartman { 4800, B4800 }, 1864ab4382d2SGreg Kroah-Hartman { 2400, B2400 }, 1865ab4382d2SGreg Kroah-Hartman { 1200, B1200 }, 1866ab4382d2SGreg Kroah-Hartman { 0, B38400 } 1867ab4382d2SGreg Kroah-Hartman }; 1868ab4382d2SGreg Kroah-Hartman 1869ab4382d2SGreg Kroah-Hartman /** 1870ab4382d2SGreg Kroah-Hartman * uart_set_options - setup the serial console parameters 1871ab4382d2SGreg Kroah-Hartman * @port: pointer to the serial ports uart_port structure 1872ab4382d2SGreg Kroah-Hartman * @co: console pointer 1873ab4382d2SGreg Kroah-Hartman * @baud: baud rate 1874ab4382d2SGreg Kroah-Hartman * @parity: parity character - 'n' (none), 'o' (odd), 'e' (even) 1875ab4382d2SGreg Kroah-Hartman * @bits: number of data bits 1876ab4382d2SGreg Kroah-Hartman * @flow: flow control character - 'r' (rts) 1877ab4382d2SGreg Kroah-Hartman */ 1878ab4382d2SGreg Kroah-Hartman int 1879ab4382d2SGreg Kroah-Hartman uart_set_options(struct uart_port *port, struct console *co, 1880ab4382d2SGreg Kroah-Hartman int baud, int parity, int bits, int flow) 1881ab4382d2SGreg Kroah-Hartman { 1882ab4382d2SGreg Kroah-Hartman struct ktermios termios; 1883ab4382d2SGreg Kroah-Hartman static struct ktermios dummy; 1884ab4382d2SGreg Kroah-Hartman int i; 1885ab4382d2SGreg Kroah-Hartman 1886ab4382d2SGreg Kroah-Hartman /* 1887ab4382d2SGreg Kroah-Hartman * Ensure that the serial console lock is initialised 1888ab4382d2SGreg Kroah-Hartman * early. 188942b6a1baSRandy Witt * If this port is a console, then the spinlock is already 189042b6a1baSRandy Witt * initialised. 1891ab4382d2SGreg Kroah-Hartman */ 189242b6a1baSRandy Witt if (!(uart_console(port) && (port->cons->flags & CON_ENABLED))) { 1893ab4382d2SGreg Kroah-Hartman spin_lock_init(&port->lock); 1894ab4382d2SGreg Kroah-Hartman lockdep_set_class(&port->lock, &port_lock_key); 189542b6a1baSRandy Witt } 1896ab4382d2SGreg Kroah-Hartman 1897ab4382d2SGreg Kroah-Hartman memset(&termios, 0, sizeof(struct ktermios)); 1898ab4382d2SGreg Kroah-Hartman 1899ab4382d2SGreg Kroah-Hartman termios.c_cflag = CREAD | HUPCL | CLOCAL; 1900ab4382d2SGreg Kroah-Hartman 1901ab4382d2SGreg Kroah-Hartman /* 1902ab4382d2SGreg Kroah-Hartman * Construct a cflag setting. 1903ab4382d2SGreg Kroah-Hartman */ 1904ab4382d2SGreg Kroah-Hartman for (i = 0; baud_rates[i].rate; i++) 1905ab4382d2SGreg Kroah-Hartman if (baud_rates[i].rate <= baud) 1906ab4382d2SGreg Kroah-Hartman break; 1907ab4382d2SGreg Kroah-Hartman 1908ab4382d2SGreg Kroah-Hartman termios.c_cflag |= baud_rates[i].cflag; 1909ab4382d2SGreg Kroah-Hartman 1910ab4382d2SGreg Kroah-Hartman if (bits == 7) 1911ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CS7; 1912ab4382d2SGreg Kroah-Hartman else 1913ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CS8; 1914ab4382d2SGreg Kroah-Hartman 1915ab4382d2SGreg Kroah-Hartman switch (parity) { 1916ab4382d2SGreg Kroah-Hartman case 'o': case 'O': 1917ab4382d2SGreg Kroah-Hartman termios.c_cflag |= PARODD; 1918ab4382d2SGreg Kroah-Hartman /*fall through*/ 1919ab4382d2SGreg Kroah-Hartman case 'e': case 'E': 1920ab4382d2SGreg Kroah-Hartman termios.c_cflag |= PARENB; 1921ab4382d2SGreg Kroah-Hartman break; 1922ab4382d2SGreg Kroah-Hartman } 1923ab4382d2SGreg Kroah-Hartman 1924ab4382d2SGreg Kroah-Hartman if (flow == 'r') 1925ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CRTSCTS; 1926ab4382d2SGreg Kroah-Hartman 1927ab4382d2SGreg Kroah-Hartman /* 1928ab4382d2SGreg Kroah-Hartman * some uarts on other side don't support no flow control. 1929ab4382d2SGreg Kroah-Hartman * So we set * DTR in host uart to make them happy 1930ab4382d2SGreg Kroah-Hartman */ 1931ab4382d2SGreg Kroah-Hartman port->mctrl |= TIOCM_DTR; 1932ab4382d2SGreg Kroah-Hartman 1933ab4382d2SGreg Kroah-Hartman port->ops->set_termios(port, &termios, &dummy); 1934ab4382d2SGreg Kroah-Hartman /* 1935ab4382d2SGreg Kroah-Hartman * Allow the setting of the UART parameters with a NULL console 1936ab4382d2SGreg Kroah-Hartman * too: 1937ab4382d2SGreg Kroah-Hartman */ 1938ab4382d2SGreg Kroah-Hartman if (co) 1939ab4382d2SGreg Kroah-Hartman co->cflag = termios.c_cflag; 1940ab4382d2SGreg Kroah-Hartman 1941ab4382d2SGreg Kroah-Hartman return 0; 1942ab4382d2SGreg Kroah-Hartman } 1943ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_set_options); 1944ab4382d2SGreg Kroah-Hartman #endif /* CONFIG_SERIAL_CORE_CONSOLE */ 1945ab4382d2SGreg Kroah-Hartman 1946cf75525fSJiri Slaby /** 1947cf75525fSJiri Slaby * uart_change_pm - set power state of the port 1948cf75525fSJiri Slaby * 1949cf75525fSJiri Slaby * @state: port descriptor 1950cf75525fSJiri Slaby * @pm_state: new state 1951cf75525fSJiri Slaby * 1952cf75525fSJiri Slaby * Locking: port->mutex has to be held 1953cf75525fSJiri Slaby */ 19546f538fe3SLinus Walleij static void uart_change_pm(struct uart_state *state, 19556f538fe3SLinus Walleij enum uart_pm_state pm_state) 1956ab4382d2SGreg Kroah-Hartman { 1957ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 1958ab4382d2SGreg Kroah-Hartman 1959ab4382d2SGreg Kroah-Hartman if (state->pm_state != pm_state) { 1960ab4382d2SGreg Kroah-Hartman if (port->ops->pm) 1961ab4382d2SGreg Kroah-Hartman port->ops->pm(port, pm_state, state->pm_state); 1962ab4382d2SGreg Kroah-Hartman state->pm_state = pm_state; 1963ab4382d2SGreg Kroah-Hartman } 1964ab4382d2SGreg Kroah-Hartman } 1965ab4382d2SGreg Kroah-Hartman 1966ab4382d2SGreg Kroah-Hartman struct uart_match { 1967ab4382d2SGreg Kroah-Hartman struct uart_port *port; 1968ab4382d2SGreg Kroah-Hartman struct uart_driver *driver; 1969ab4382d2SGreg Kroah-Hartman }; 1970ab4382d2SGreg Kroah-Hartman 1971ab4382d2SGreg Kroah-Hartman static int serial_match_port(struct device *dev, void *data) 1972ab4382d2SGreg Kroah-Hartman { 1973ab4382d2SGreg Kroah-Hartman struct uart_match *match = data; 1974ab4382d2SGreg Kroah-Hartman struct tty_driver *tty_drv = match->driver->tty_driver; 1975ab4382d2SGreg Kroah-Hartman dev_t devt = MKDEV(tty_drv->major, tty_drv->minor_start) + 1976ab4382d2SGreg Kroah-Hartman match->port->line; 1977ab4382d2SGreg Kroah-Hartman 1978ab4382d2SGreg Kroah-Hartman return dev->devt == devt; /* Actually, only one tty per port */ 1979ab4382d2SGreg Kroah-Hartman } 1980ab4382d2SGreg Kroah-Hartman 1981ab4382d2SGreg Kroah-Hartman int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport) 1982ab4382d2SGreg Kroah-Hartman { 1983ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 1984ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1985ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 1986ab4382d2SGreg Kroah-Hartman struct uart_match match = {uport, drv}; 1987ab4382d2SGreg Kroah-Hartman 1988ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1989ab4382d2SGreg Kroah-Hartman 1990ab4382d2SGreg Kroah-Hartman tty_dev = device_find_child(uport->dev, &match, serial_match_port); 1991ab4382d2SGreg Kroah-Hartman if (device_may_wakeup(tty_dev)) { 1992ab4382d2SGreg Kroah-Hartman if (!enable_irq_wake(uport->irq)) 1993ab4382d2SGreg Kroah-Hartman uport->irq_wake = 1; 1994ab4382d2SGreg Kroah-Hartman put_device(tty_dev); 1995ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1996ab4382d2SGreg Kroah-Hartman return 0; 1997ab4382d2SGreg Kroah-Hartman } 19985a65dcc0SFederico Vaga put_device(tty_dev); 19995a65dcc0SFederico Vaga 2000ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) 2001ab4382d2SGreg Kroah-Hartman uport->suspended = 1; 2002ab4382d2SGreg Kroah-Hartman 2003ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_INITIALIZED) { 2004ab4382d2SGreg Kroah-Hartman const struct uart_ops *ops = uport->ops; 2005ab4382d2SGreg Kroah-Hartman int tries; 2006ab4382d2SGreg Kroah-Hartman 2007ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) { 2008ab4382d2SGreg Kroah-Hartman set_bit(ASYNCB_SUSPENDED, &port->flags); 2009ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_INITIALIZED, &port->flags); 2010ab4382d2SGreg Kroah-Hartman 2011ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 2012ab4382d2SGreg Kroah-Hartman ops->stop_tx(uport); 2013ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, 0); 2014ab4382d2SGreg Kroah-Hartman ops->stop_rx(uport); 2015ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2016ab4382d2SGreg Kroah-Hartman } 2017ab4382d2SGreg Kroah-Hartman 2018ab4382d2SGreg Kroah-Hartman /* 2019ab4382d2SGreg Kroah-Hartman * Wait for the transmitter to empty. 2020ab4382d2SGreg Kroah-Hartman */ 2021ab4382d2SGreg Kroah-Hartman for (tries = 3; !ops->tx_empty(uport) && tries; tries--) 2022ab4382d2SGreg Kroah-Hartman msleep(10); 2023ab4382d2SGreg Kroah-Hartman if (!tries) 20242f2dafe7SSudip Mukherjee dev_err(uport->dev, "%s%d: Unable to drain transmitter\n", 2025ab4382d2SGreg Kroah-Hartman drv->dev_name, 2026ab4382d2SGreg Kroah-Hartman drv->tty_driver->name_base + uport->line); 2027ab4382d2SGreg Kroah-Hartman 2028ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) 2029ab4382d2SGreg Kroah-Hartman ops->shutdown(uport); 2030ab4382d2SGreg Kroah-Hartman } 2031ab4382d2SGreg Kroah-Hartman 2032ab4382d2SGreg Kroah-Hartman /* 2033ab4382d2SGreg Kroah-Hartman * Disable the console device before suspending. 2034ab4382d2SGreg Kroah-Hartman */ 2035ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled && uart_console(uport)) 2036ab4382d2SGreg Kroah-Hartman console_stop(uport->cons); 2037ab4382d2SGreg Kroah-Hartman 2038ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) 20396f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_OFF); 2040ab4382d2SGreg Kroah-Hartman 2041ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2042ab4382d2SGreg Kroah-Hartman 2043ab4382d2SGreg Kroah-Hartman return 0; 2044ab4382d2SGreg Kroah-Hartman } 2045ab4382d2SGreg Kroah-Hartman 2046ab4382d2SGreg Kroah-Hartman int uart_resume_port(struct uart_driver *drv, struct uart_port *uport) 2047ab4382d2SGreg Kroah-Hartman { 2048ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 2049ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2050ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 2051ab4382d2SGreg Kroah-Hartman struct uart_match match = {uport, drv}; 2052ab4382d2SGreg Kroah-Hartman struct ktermios termios; 2053ab4382d2SGreg Kroah-Hartman 2054ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2055ab4382d2SGreg Kroah-Hartman 2056ab4382d2SGreg Kroah-Hartman tty_dev = device_find_child(uport->dev, &match, serial_match_port); 2057ab4382d2SGreg Kroah-Hartman if (!uport->suspended && device_may_wakeup(tty_dev)) { 2058ab4382d2SGreg Kroah-Hartman if (uport->irq_wake) { 2059ab4382d2SGreg Kroah-Hartman disable_irq_wake(uport->irq); 2060ab4382d2SGreg Kroah-Hartman uport->irq_wake = 0; 2061ab4382d2SGreg Kroah-Hartman } 20625a65dcc0SFederico Vaga put_device(tty_dev); 2063ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2064ab4382d2SGreg Kroah-Hartman return 0; 2065ab4382d2SGreg Kroah-Hartman } 20665a65dcc0SFederico Vaga put_device(tty_dev); 2067ab4382d2SGreg Kroah-Hartman uport->suspended = 0; 2068ab4382d2SGreg Kroah-Hartman 2069ab4382d2SGreg Kroah-Hartman /* 2070ab4382d2SGreg Kroah-Hartman * Re-enable the console device after suspending. 2071ab4382d2SGreg Kroah-Hartman */ 20725933a161SYin Kangkai if (uart_console(uport)) { 2073ab4382d2SGreg Kroah-Hartman /* 2074ab4382d2SGreg Kroah-Hartman * First try to use the console cflag setting. 2075ab4382d2SGreg Kroah-Hartman */ 2076ab4382d2SGreg Kroah-Hartman memset(&termios, 0, sizeof(struct ktermios)); 2077ab4382d2SGreg Kroah-Hartman termios.c_cflag = uport->cons->cflag; 2078ab4382d2SGreg Kroah-Hartman 2079ab4382d2SGreg Kroah-Hartman /* 2080ab4382d2SGreg Kroah-Hartman * If that's unset, use the tty termios setting. 2081ab4382d2SGreg Kroah-Hartman */ 2082adc8d746SAlan Cox if (port->tty && termios.c_cflag == 0) 2083adc8d746SAlan Cox termios = port->tty->termios; 2084ab4382d2SGreg Kroah-Hartman 208594abc56fSNing Jiang if (console_suspend_enabled) 20866f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2087ab4382d2SGreg Kroah-Hartman uport->ops->set_termios(uport, &termios, NULL); 20885933a161SYin Kangkai if (console_suspend_enabled) 2089ab4382d2SGreg Kroah-Hartman console_start(uport->cons); 2090ab4382d2SGreg Kroah-Hartman } 2091ab4382d2SGreg Kroah-Hartman 2092ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_SUSPENDED) { 2093ab4382d2SGreg Kroah-Hartman const struct uart_ops *ops = uport->ops; 2094ab4382d2SGreg Kroah-Hartman int ret; 2095ab4382d2SGreg Kroah-Hartman 20966f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2097ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 2098ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, 0); 2099ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2100ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) { 2101ab4382d2SGreg Kroah-Hartman /* Protected by port mutex for now */ 2102ab4382d2SGreg Kroah-Hartman struct tty_struct *tty = port->tty; 2103ab4382d2SGreg Kroah-Hartman ret = ops->startup(uport); 2104ab4382d2SGreg Kroah-Hartman if (ret == 0) { 2105ab4382d2SGreg Kroah-Hartman if (tty) 2106ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 2107ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 2108ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, uport->mctrl); 2109ab4382d2SGreg Kroah-Hartman ops->start_tx(uport); 2110ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2111ab4382d2SGreg Kroah-Hartman set_bit(ASYNCB_INITIALIZED, &port->flags); 2112ab4382d2SGreg Kroah-Hartman } else { 2113ab4382d2SGreg Kroah-Hartman /* 2114ab4382d2SGreg Kroah-Hartman * Failed to resume - maybe hardware went away? 2115ab4382d2SGreg Kroah-Hartman * Clear the "initialized" flag so we won't try 2116ab4382d2SGreg Kroah-Hartman * to call the low level drivers shutdown method. 2117ab4382d2SGreg Kroah-Hartman */ 2118ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 2119ab4382d2SGreg Kroah-Hartman } 2120ab4382d2SGreg Kroah-Hartman } 2121ab4382d2SGreg Kroah-Hartman 2122ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_SUSPENDED, &port->flags); 2123ab4382d2SGreg Kroah-Hartman } 2124ab4382d2SGreg Kroah-Hartman 2125ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2126ab4382d2SGreg Kroah-Hartman 2127ab4382d2SGreg Kroah-Hartman return 0; 2128ab4382d2SGreg Kroah-Hartman } 2129ab4382d2SGreg Kroah-Hartman 2130ab4382d2SGreg Kroah-Hartman static inline void 2131ab4382d2SGreg Kroah-Hartman uart_report_port(struct uart_driver *drv, struct uart_port *port) 2132ab4382d2SGreg Kroah-Hartman { 2133ab4382d2SGreg Kroah-Hartman char address[64]; 2134ab4382d2SGreg Kroah-Hartman 2135ab4382d2SGreg Kroah-Hartman switch (port->iotype) { 2136ab4382d2SGreg Kroah-Hartman case UPIO_PORT: 2137ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), "I/O 0x%lx", port->iobase); 2138ab4382d2SGreg Kroah-Hartman break; 2139ab4382d2SGreg Kroah-Hartman case UPIO_HUB6: 2140ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), 2141ab4382d2SGreg Kroah-Hartman "I/O 0x%lx offset 0x%x", port->iobase, port->hub6); 2142ab4382d2SGreg Kroah-Hartman break; 2143ab4382d2SGreg Kroah-Hartman case UPIO_MEM: 2144ab4382d2SGreg Kroah-Hartman case UPIO_MEM32: 2145ab4382d2SGreg Kroah-Hartman case UPIO_AU: 2146ab4382d2SGreg Kroah-Hartman case UPIO_TSI: 2147ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), 2148ab4382d2SGreg Kroah-Hartman "MMIO 0x%llx", (unsigned long long)port->mapbase); 2149ab4382d2SGreg Kroah-Hartman break; 2150ab4382d2SGreg Kroah-Hartman default: 2151ab4382d2SGreg Kroah-Hartman strlcpy(address, "*unknown*", sizeof(address)); 2152ab4382d2SGreg Kroah-Hartman break; 2153ab4382d2SGreg Kroah-Hartman } 2154ab4382d2SGreg Kroah-Hartman 21552f2dafe7SSudip Mukherjee dev_info(port->dev, "%s%d at %s (irq = %d, base_baud = %d) is a %s\n", 2156ab4382d2SGreg Kroah-Hartman drv->dev_name, 2157ab4382d2SGreg Kroah-Hartman drv->tty_driver->name_base + port->line, 21587d12b976SKees Cook address, port->irq, port->uartclk / 16, uart_type(port)); 2159ab4382d2SGreg Kroah-Hartman } 2160ab4382d2SGreg Kroah-Hartman 2161ab4382d2SGreg Kroah-Hartman static void 2162ab4382d2SGreg Kroah-Hartman uart_configure_port(struct uart_driver *drv, struct uart_state *state, 2163ab4382d2SGreg Kroah-Hartman struct uart_port *port) 2164ab4382d2SGreg Kroah-Hartman { 2165ab4382d2SGreg Kroah-Hartman unsigned int flags; 2166ab4382d2SGreg Kroah-Hartman 2167ab4382d2SGreg Kroah-Hartman /* 2168ab4382d2SGreg Kroah-Hartman * If there isn't a port here, don't do anything further. 2169ab4382d2SGreg Kroah-Hartman */ 2170ab4382d2SGreg Kroah-Hartman if (!port->iobase && !port->mapbase && !port->membase) 2171ab4382d2SGreg Kroah-Hartman return; 2172ab4382d2SGreg Kroah-Hartman 2173ab4382d2SGreg Kroah-Hartman /* 2174ab4382d2SGreg Kroah-Hartman * Now do the auto configuration stuff. Note that config_port 2175ab4382d2SGreg Kroah-Hartman * is expected to claim the resources and map the port for us. 2176ab4382d2SGreg Kroah-Hartman */ 2177ab4382d2SGreg Kroah-Hartman flags = 0; 2178ab4382d2SGreg Kroah-Hartman if (port->flags & UPF_AUTO_IRQ) 2179ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_IRQ; 2180ab4382d2SGreg Kroah-Hartman if (port->flags & UPF_BOOT_AUTOCONF) { 2181ab4382d2SGreg Kroah-Hartman if (!(port->flags & UPF_FIXED_TYPE)) { 2182ab4382d2SGreg Kroah-Hartman port->type = PORT_UNKNOWN; 2183ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_TYPE; 2184ab4382d2SGreg Kroah-Hartman } 2185ab4382d2SGreg Kroah-Hartman port->ops->config_port(port, flags); 2186ab4382d2SGreg Kroah-Hartman } 2187ab4382d2SGreg Kroah-Hartman 2188ab4382d2SGreg Kroah-Hartman if (port->type != PORT_UNKNOWN) { 2189ab4382d2SGreg Kroah-Hartman unsigned long flags; 2190ab4382d2SGreg Kroah-Hartman 2191ab4382d2SGreg Kroah-Hartman uart_report_port(drv, port); 2192ab4382d2SGreg Kroah-Hartman 2193ab4382d2SGreg Kroah-Hartman /* Power up port for set_mctrl() */ 21946f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2195ab4382d2SGreg Kroah-Hartman 2196ab4382d2SGreg Kroah-Hartman /* 2197ab4382d2SGreg Kroah-Hartman * Ensure that the modem control lines are de-activated. 2198ab4382d2SGreg Kroah-Hartman * keep the DTR setting that is set in uart_set_options() 2199ab4382d2SGreg Kroah-Hartman * We probably don't need a spinlock around this, but 2200ab4382d2SGreg Kroah-Hartman */ 2201ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 2202ab4382d2SGreg Kroah-Hartman port->ops->set_mctrl(port, port->mctrl & TIOCM_DTR); 2203ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 2204ab4382d2SGreg Kroah-Hartman 2205ab4382d2SGreg Kroah-Hartman /* 2206ab4382d2SGreg Kroah-Hartman * If this driver supports console, and it hasn't been 2207ab4382d2SGreg Kroah-Hartman * successfully registered yet, try to re-register it. 2208ab4382d2SGreg Kroah-Hartman * It may be that the port was not available. 2209ab4382d2SGreg Kroah-Hartman */ 2210ab4382d2SGreg Kroah-Hartman if (port->cons && !(port->cons->flags & CON_ENABLED)) 2211ab4382d2SGreg Kroah-Hartman register_console(port->cons); 2212ab4382d2SGreg Kroah-Hartman 2213ab4382d2SGreg Kroah-Hartman /* 2214ab4382d2SGreg Kroah-Hartman * Power down all ports by default, except the 2215ab4382d2SGreg Kroah-Hartman * console if we have one. 2216ab4382d2SGreg Kroah-Hartman */ 2217ab4382d2SGreg Kroah-Hartman if (!uart_console(port)) 22186f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_OFF); 2219ab4382d2SGreg Kroah-Hartman } 2220ab4382d2SGreg Kroah-Hartman } 2221ab4382d2SGreg Kroah-Hartman 2222ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 2223ab4382d2SGreg Kroah-Hartman 2224ab4382d2SGreg Kroah-Hartman static int uart_poll_init(struct tty_driver *driver, int line, char *options) 2225ab4382d2SGreg Kroah-Hartman { 2226ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2227ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2228ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2229ab4382d2SGreg Kroah-Hartman int baud = 9600; 2230ab4382d2SGreg Kroah-Hartman int bits = 8; 2231ab4382d2SGreg Kroah-Hartman int parity = 'n'; 2232ab4382d2SGreg Kroah-Hartman int flow = 'n'; 2233c7f3e708SAnton Vorontsov int ret; 2234ab4382d2SGreg Kroah-Hartman 2235ab4382d2SGreg Kroah-Hartman if (!state || !state->uart_port) 2236ab4382d2SGreg Kroah-Hartman return -1; 2237ab4382d2SGreg Kroah-Hartman 2238ab4382d2SGreg Kroah-Hartman port = state->uart_port; 2239ab4382d2SGreg Kroah-Hartman if (!(port->ops->poll_get_char && port->ops->poll_put_char)) 2240ab4382d2SGreg Kroah-Hartman return -1; 2241ab4382d2SGreg Kroah-Hartman 2242c7f3e708SAnton Vorontsov if (port->ops->poll_init) { 2243c7f3e708SAnton Vorontsov struct tty_port *tport = &state->port; 2244c7f3e708SAnton Vorontsov 2245c7f3e708SAnton Vorontsov ret = 0; 2246c7f3e708SAnton Vorontsov mutex_lock(&tport->mutex); 2247c7f3e708SAnton Vorontsov /* 2248c7f3e708SAnton Vorontsov * We don't set ASYNCB_INITIALIZED as we only initialized the 2249c7f3e708SAnton Vorontsov * hw, e.g. state->xmit is still uninitialized. 2250c7f3e708SAnton Vorontsov */ 2251c7f3e708SAnton Vorontsov if (!test_bit(ASYNCB_INITIALIZED, &tport->flags)) 2252c7f3e708SAnton Vorontsov ret = port->ops->poll_init(port); 2253c7f3e708SAnton Vorontsov mutex_unlock(&tport->mutex); 2254c7f3e708SAnton Vorontsov if (ret) 2255c7f3e708SAnton Vorontsov return ret; 2256c7f3e708SAnton Vorontsov } 2257c7f3e708SAnton Vorontsov 2258ab4382d2SGreg Kroah-Hartman if (options) { 2259ab4382d2SGreg Kroah-Hartman uart_parse_options(options, &baud, &parity, &bits, &flow); 2260ab4382d2SGreg Kroah-Hartman return uart_set_options(port, NULL, baud, parity, bits, flow); 2261ab4382d2SGreg Kroah-Hartman } 2262ab4382d2SGreg Kroah-Hartman 2263ab4382d2SGreg Kroah-Hartman return 0; 2264ab4382d2SGreg Kroah-Hartman } 2265ab4382d2SGreg Kroah-Hartman 2266ab4382d2SGreg Kroah-Hartman static int uart_poll_get_char(struct tty_driver *driver, int line) 2267ab4382d2SGreg Kroah-Hartman { 2268ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2269ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2270ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2271ab4382d2SGreg Kroah-Hartman 2272ab4382d2SGreg Kroah-Hartman if (!state || !state->uart_port) 2273ab4382d2SGreg Kroah-Hartman return -1; 2274ab4382d2SGreg Kroah-Hartman 2275ab4382d2SGreg Kroah-Hartman port = state->uart_port; 2276ab4382d2SGreg Kroah-Hartman return port->ops->poll_get_char(port); 2277ab4382d2SGreg Kroah-Hartman } 2278ab4382d2SGreg Kroah-Hartman 2279ab4382d2SGreg Kroah-Hartman static void uart_poll_put_char(struct tty_driver *driver, int line, char ch) 2280ab4382d2SGreg Kroah-Hartman { 2281ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2282ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2283ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2284ab4382d2SGreg Kroah-Hartman 2285ab4382d2SGreg Kroah-Hartman if (!state || !state->uart_port) 2286ab4382d2SGreg Kroah-Hartman return; 2287ab4382d2SGreg Kroah-Hartman 2288ab4382d2SGreg Kroah-Hartman port = state->uart_port; 2289c7d44a02SDoug Anderson 2290c7d44a02SDoug Anderson if (ch == '\n') 2291c7d44a02SDoug Anderson port->ops->poll_put_char(port, '\r'); 2292ab4382d2SGreg Kroah-Hartman port->ops->poll_put_char(port, ch); 2293ab4382d2SGreg Kroah-Hartman } 2294ab4382d2SGreg Kroah-Hartman #endif 2295ab4382d2SGreg Kroah-Hartman 2296ab4382d2SGreg Kroah-Hartman static const struct tty_operations uart_ops = { 2297ab4382d2SGreg Kroah-Hartman .open = uart_open, 2298ab4382d2SGreg Kroah-Hartman .close = uart_close, 2299ab4382d2SGreg Kroah-Hartman .write = uart_write, 2300ab4382d2SGreg Kroah-Hartman .put_char = uart_put_char, 2301ab4382d2SGreg Kroah-Hartman .flush_chars = uart_flush_chars, 2302ab4382d2SGreg Kroah-Hartman .write_room = uart_write_room, 2303ab4382d2SGreg Kroah-Hartman .chars_in_buffer= uart_chars_in_buffer, 2304ab4382d2SGreg Kroah-Hartman .flush_buffer = uart_flush_buffer, 2305ab4382d2SGreg Kroah-Hartman .ioctl = uart_ioctl, 2306ab4382d2SGreg Kroah-Hartman .throttle = uart_throttle, 2307ab4382d2SGreg Kroah-Hartman .unthrottle = uart_unthrottle, 2308ab4382d2SGreg Kroah-Hartman .send_xchar = uart_send_xchar, 2309ab4382d2SGreg Kroah-Hartman .set_termios = uart_set_termios, 2310ab4382d2SGreg Kroah-Hartman .set_ldisc = uart_set_ldisc, 2311ab4382d2SGreg Kroah-Hartman .stop = uart_stop, 2312ab4382d2SGreg Kroah-Hartman .start = uart_start, 2313ab4382d2SGreg Kroah-Hartman .hangup = uart_hangup, 2314ab4382d2SGreg Kroah-Hartman .break_ctl = uart_break_ctl, 2315ab4382d2SGreg Kroah-Hartman .wait_until_sent= uart_wait_until_sent, 2316ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_PROC_FS 2317ab4382d2SGreg Kroah-Hartman .proc_fops = &uart_proc_fops, 2318ab4382d2SGreg Kroah-Hartman #endif 2319ab4382d2SGreg Kroah-Hartman .tiocmget = uart_tiocmget, 2320ab4382d2SGreg Kroah-Hartman .tiocmset = uart_tiocmset, 2321ab4382d2SGreg Kroah-Hartman .get_icount = uart_get_icount, 2322ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 2323ab4382d2SGreg Kroah-Hartman .poll_init = uart_poll_init, 2324ab4382d2SGreg Kroah-Hartman .poll_get_char = uart_poll_get_char, 2325ab4382d2SGreg Kroah-Hartman .poll_put_char = uart_poll_put_char, 2326ab4382d2SGreg Kroah-Hartman #endif 2327ab4382d2SGreg Kroah-Hartman }; 2328ab4382d2SGreg Kroah-Hartman 2329ab4382d2SGreg Kroah-Hartman static const struct tty_port_operations uart_port_ops = { 23300b1db830SJiri Slaby .activate = uart_port_activate, 23310b1db830SJiri Slaby .shutdown = uart_port_shutdown, 2332ab4382d2SGreg Kroah-Hartman .carrier_raised = uart_carrier_raised, 2333ab4382d2SGreg Kroah-Hartman .dtr_rts = uart_dtr_rts, 2334ab4382d2SGreg Kroah-Hartman }; 2335ab4382d2SGreg Kroah-Hartman 2336ab4382d2SGreg Kroah-Hartman /** 2337ab4382d2SGreg Kroah-Hartman * uart_register_driver - register a driver with the uart core layer 2338ab4382d2SGreg Kroah-Hartman * @drv: low level driver structure 2339ab4382d2SGreg Kroah-Hartman * 2340ab4382d2SGreg Kroah-Hartman * Register a uart driver with the core driver. We in turn register 2341ab4382d2SGreg Kroah-Hartman * with the tty layer, and initialise the core driver per-port state. 2342ab4382d2SGreg Kroah-Hartman * 2343ab4382d2SGreg Kroah-Hartman * We have a proc file in /proc/tty/driver which is named after the 2344ab4382d2SGreg Kroah-Hartman * normal driver. 2345ab4382d2SGreg Kroah-Hartman * 2346ab4382d2SGreg Kroah-Hartman * drv->port should be NULL, and the per-port structures should be 2347ab4382d2SGreg Kroah-Hartman * registered using uart_add_one_port after this call has succeeded. 2348ab4382d2SGreg Kroah-Hartman */ 2349ab4382d2SGreg Kroah-Hartman int uart_register_driver(struct uart_driver *drv) 2350ab4382d2SGreg Kroah-Hartman { 2351ab4382d2SGreg Kroah-Hartman struct tty_driver *normal; 2352ab4382d2SGreg Kroah-Hartman int i, retval; 2353ab4382d2SGreg Kroah-Hartman 2354ab4382d2SGreg Kroah-Hartman BUG_ON(drv->state); 2355ab4382d2SGreg Kroah-Hartman 2356ab4382d2SGreg Kroah-Hartman /* 2357ab4382d2SGreg Kroah-Hartman * Maybe we should be using a slab cache for this, especially if 2358ab4382d2SGreg Kroah-Hartman * we have a large number of ports to handle. 2359ab4382d2SGreg Kroah-Hartman */ 2360ab4382d2SGreg Kroah-Hartman drv->state = kzalloc(sizeof(struct uart_state) * drv->nr, GFP_KERNEL); 2361ab4382d2SGreg Kroah-Hartman if (!drv->state) 2362ab4382d2SGreg Kroah-Hartman goto out; 2363ab4382d2SGreg Kroah-Hartman 2364ab4382d2SGreg Kroah-Hartman normal = alloc_tty_driver(drv->nr); 2365ab4382d2SGreg Kroah-Hartman if (!normal) 2366ab4382d2SGreg Kroah-Hartman goto out_kfree; 2367ab4382d2SGreg Kroah-Hartman 2368ab4382d2SGreg Kroah-Hartman drv->tty_driver = normal; 2369ab4382d2SGreg Kroah-Hartman 2370ab4382d2SGreg Kroah-Hartman normal->driver_name = drv->driver_name; 2371ab4382d2SGreg Kroah-Hartman normal->name = drv->dev_name; 2372ab4382d2SGreg Kroah-Hartman normal->major = drv->major; 2373ab4382d2SGreg Kroah-Hartman normal->minor_start = drv->minor; 2374ab4382d2SGreg Kroah-Hartman normal->type = TTY_DRIVER_TYPE_SERIAL; 2375ab4382d2SGreg Kroah-Hartman normal->subtype = SERIAL_TYPE_NORMAL; 2376ab4382d2SGreg Kroah-Hartman normal->init_termios = tty_std_termios; 2377ab4382d2SGreg Kroah-Hartman normal->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; 2378ab4382d2SGreg Kroah-Hartman normal->init_termios.c_ispeed = normal->init_termios.c_ospeed = 9600; 2379ab4382d2SGreg Kroah-Hartman normal->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; 2380ab4382d2SGreg Kroah-Hartman normal->driver_state = drv; 2381ab4382d2SGreg Kroah-Hartman tty_set_operations(normal, &uart_ops); 2382ab4382d2SGreg Kroah-Hartman 2383ab4382d2SGreg Kroah-Hartman /* 2384ab4382d2SGreg Kroah-Hartman * Initialise the UART state(s). 2385ab4382d2SGreg Kroah-Hartman */ 2386ab4382d2SGreg Kroah-Hartman for (i = 0; i < drv->nr; i++) { 2387ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + i; 2388ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2389ab4382d2SGreg Kroah-Hartman 2390ab4382d2SGreg Kroah-Hartman tty_port_init(port); 2391ab4382d2SGreg Kroah-Hartman port->ops = &uart_port_ops; 2392ab4382d2SGreg Kroah-Hartman } 2393ab4382d2SGreg Kroah-Hartman 2394ab4382d2SGreg Kroah-Hartman retval = tty_register_driver(normal); 2395ab4382d2SGreg Kroah-Hartman if (retval >= 0) 2396ab4382d2SGreg Kroah-Hartman return retval; 2397ab4382d2SGreg Kroah-Hartman 2398191c5f10SJiri Slaby for (i = 0; i < drv->nr; i++) 2399191c5f10SJiri Slaby tty_port_destroy(&drv->state[i].port); 2400ab4382d2SGreg Kroah-Hartman put_tty_driver(normal); 2401ab4382d2SGreg Kroah-Hartman out_kfree: 2402ab4382d2SGreg Kroah-Hartman kfree(drv->state); 2403ab4382d2SGreg Kroah-Hartman out: 2404ab4382d2SGreg Kroah-Hartman return -ENOMEM; 2405ab4382d2SGreg Kroah-Hartman } 2406ab4382d2SGreg Kroah-Hartman 2407ab4382d2SGreg Kroah-Hartman /** 2408ab4382d2SGreg Kroah-Hartman * uart_unregister_driver - remove a driver from the uart core layer 2409ab4382d2SGreg Kroah-Hartman * @drv: low level driver structure 2410ab4382d2SGreg Kroah-Hartman * 2411ab4382d2SGreg Kroah-Hartman * Remove all references to a driver from the core driver. The low 2412ab4382d2SGreg Kroah-Hartman * level driver must have removed all its ports via the 2413ab4382d2SGreg Kroah-Hartman * uart_remove_one_port() if it registered them with uart_add_one_port(). 2414ab4382d2SGreg Kroah-Hartman * (ie, drv->port == NULL) 2415ab4382d2SGreg Kroah-Hartman */ 2416ab4382d2SGreg Kroah-Hartman void uart_unregister_driver(struct uart_driver *drv) 2417ab4382d2SGreg Kroah-Hartman { 2418ab4382d2SGreg Kroah-Hartman struct tty_driver *p = drv->tty_driver; 2419191c5f10SJiri Slaby unsigned int i; 2420191c5f10SJiri Slaby 2421ab4382d2SGreg Kroah-Hartman tty_unregister_driver(p); 2422ab4382d2SGreg Kroah-Hartman put_tty_driver(p); 2423191c5f10SJiri Slaby for (i = 0; i < drv->nr; i++) 2424191c5f10SJiri Slaby tty_port_destroy(&drv->state[i].port); 2425ab4382d2SGreg Kroah-Hartman kfree(drv->state); 24261e66cdedSAlan Cox drv->state = NULL; 2427ab4382d2SGreg Kroah-Hartman drv->tty_driver = NULL; 2428ab4382d2SGreg Kroah-Hartman } 2429ab4382d2SGreg Kroah-Hartman 2430ab4382d2SGreg Kroah-Hartman struct tty_driver *uart_console_device(struct console *co, int *index) 2431ab4382d2SGreg Kroah-Hartman { 2432ab4382d2SGreg Kroah-Hartman struct uart_driver *p = co->data; 2433ab4382d2SGreg Kroah-Hartman *index = co->index; 2434ab4382d2SGreg Kroah-Hartman return p->tty_driver; 2435ab4382d2SGreg Kroah-Hartman } 2436ab4382d2SGreg Kroah-Hartman 24376915c0e4STomas Hlavacek static ssize_t uart_get_attr_uartclk(struct device *dev, 24386915c0e4STomas Hlavacek struct device_attribute *attr, char *buf) 24396915c0e4STomas Hlavacek { 2440bebe73e3SAlan Cox struct serial_struct tmp; 24416915c0e4STomas Hlavacek struct tty_port *port = dev_get_drvdata(dev); 2442b1b79916STomas Hlavacek 24439f109694SAlan Cox uart_get_info(port, &tmp); 2444bebe73e3SAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.baud_base * 16); 24456915c0e4STomas Hlavacek } 24466915c0e4STomas Hlavacek 2447373bac4cSAlan Cox static ssize_t uart_get_attr_type(struct device *dev, 2448373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2449373bac4cSAlan Cox { 2450373bac4cSAlan Cox struct serial_struct tmp; 2451373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2452373bac4cSAlan Cox 2453373bac4cSAlan Cox uart_get_info(port, &tmp); 2454373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.type); 2455373bac4cSAlan Cox } 2456373bac4cSAlan Cox static ssize_t uart_get_attr_line(struct device *dev, 2457373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2458373bac4cSAlan Cox { 2459373bac4cSAlan Cox struct serial_struct tmp; 2460373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2461373bac4cSAlan Cox 2462373bac4cSAlan Cox uart_get_info(port, &tmp); 2463373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.line); 2464373bac4cSAlan Cox } 2465373bac4cSAlan Cox 2466373bac4cSAlan Cox static ssize_t uart_get_attr_port(struct device *dev, 2467373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2468373bac4cSAlan Cox { 2469373bac4cSAlan Cox struct serial_struct tmp; 2470373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2471fd985e1dSAndrew Morton unsigned long ioaddr; 2472373bac4cSAlan Cox 2473373bac4cSAlan Cox uart_get_info(port, &tmp); 2474fd985e1dSAndrew Morton ioaddr = tmp.port; 2475fd985e1dSAndrew Morton if (HIGH_BITS_OFFSET) 2476fd985e1dSAndrew Morton ioaddr |= (unsigned long)tmp.port_high << HIGH_BITS_OFFSET; 2477fd985e1dSAndrew Morton return snprintf(buf, PAGE_SIZE, "0x%lX\n", ioaddr); 2478373bac4cSAlan Cox } 2479373bac4cSAlan Cox 2480373bac4cSAlan Cox static ssize_t uart_get_attr_irq(struct device *dev, 2481373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2482373bac4cSAlan Cox { 2483373bac4cSAlan Cox struct serial_struct tmp; 2484373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2485373bac4cSAlan Cox 2486373bac4cSAlan Cox uart_get_info(port, &tmp); 2487373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.irq); 2488373bac4cSAlan Cox } 2489373bac4cSAlan Cox 2490373bac4cSAlan Cox static ssize_t uart_get_attr_flags(struct device *dev, 2491373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2492373bac4cSAlan Cox { 2493373bac4cSAlan Cox struct serial_struct tmp; 2494373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2495373bac4cSAlan Cox 2496373bac4cSAlan Cox uart_get_info(port, &tmp); 2497373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "0x%X\n", tmp.flags); 2498373bac4cSAlan Cox } 2499373bac4cSAlan Cox 2500373bac4cSAlan Cox static ssize_t uart_get_attr_xmit_fifo_size(struct device *dev, 2501373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2502373bac4cSAlan Cox { 2503373bac4cSAlan Cox struct serial_struct tmp; 2504373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2505373bac4cSAlan Cox 2506373bac4cSAlan Cox uart_get_info(port, &tmp); 2507373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.xmit_fifo_size); 2508373bac4cSAlan Cox } 2509373bac4cSAlan Cox 2510373bac4cSAlan Cox 2511373bac4cSAlan Cox static ssize_t uart_get_attr_close_delay(struct device *dev, 2512373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2513373bac4cSAlan Cox { 2514373bac4cSAlan Cox struct serial_struct tmp; 2515373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2516373bac4cSAlan Cox 2517373bac4cSAlan Cox uart_get_info(port, &tmp); 2518373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.close_delay); 2519373bac4cSAlan Cox } 2520373bac4cSAlan Cox 2521373bac4cSAlan Cox 2522373bac4cSAlan Cox static ssize_t uart_get_attr_closing_wait(struct device *dev, 2523373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2524373bac4cSAlan Cox { 2525373bac4cSAlan Cox struct serial_struct tmp; 2526373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2527373bac4cSAlan Cox 2528373bac4cSAlan Cox uart_get_info(port, &tmp); 2529373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.closing_wait); 2530373bac4cSAlan Cox } 2531373bac4cSAlan Cox 2532373bac4cSAlan Cox static ssize_t uart_get_attr_custom_divisor(struct device *dev, 2533373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2534373bac4cSAlan Cox { 2535373bac4cSAlan Cox struct serial_struct tmp; 2536373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2537373bac4cSAlan Cox 2538373bac4cSAlan Cox uart_get_info(port, &tmp); 2539373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.custom_divisor); 2540373bac4cSAlan Cox } 2541373bac4cSAlan Cox 2542373bac4cSAlan Cox static ssize_t uart_get_attr_io_type(struct device *dev, 2543373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2544373bac4cSAlan Cox { 2545373bac4cSAlan Cox struct serial_struct tmp; 2546373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2547373bac4cSAlan Cox 2548373bac4cSAlan Cox uart_get_info(port, &tmp); 2549373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.io_type); 2550373bac4cSAlan Cox } 2551373bac4cSAlan Cox 2552373bac4cSAlan Cox static ssize_t uart_get_attr_iomem_base(struct device *dev, 2553373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2554373bac4cSAlan Cox { 2555373bac4cSAlan Cox struct serial_struct tmp; 2556373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2557373bac4cSAlan Cox 2558373bac4cSAlan Cox uart_get_info(port, &tmp); 2559373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "0x%lX\n", (unsigned long)tmp.iomem_base); 2560373bac4cSAlan Cox } 2561373bac4cSAlan Cox 2562373bac4cSAlan Cox static ssize_t uart_get_attr_iomem_reg_shift(struct device *dev, 2563373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2564373bac4cSAlan Cox { 2565373bac4cSAlan Cox struct serial_struct tmp; 2566373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2567373bac4cSAlan Cox 2568373bac4cSAlan Cox uart_get_info(port, &tmp); 2569373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.iomem_reg_shift); 2570373bac4cSAlan Cox } 2571373bac4cSAlan Cox 2572373bac4cSAlan Cox static DEVICE_ATTR(type, S_IRUSR | S_IRGRP, uart_get_attr_type, NULL); 2573373bac4cSAlan Cox static DEVICE_ATTR(line, S_IRUSR | S_IRGRP, uart_get_attr_line, NULL); 2574373bac4cSAlan Cox static DEVICE_ATTR(port, S_IRUSR | S_IRGRP, uart_get_attr_port, NULL); 2575373bac4cSAlan Cox static DEVICE_ATTR(irq, S_IRUSR | S_IRGRP, uart_get_attr_irq, NULL); 2576373bac4cSAlan Cox static DEVICE_ATTR(flags, S_IRUSR | S_IRGRP, uart_get_attr_flags, NULL); 2577373bac4cSAlan Cox static DEVICE_ATTR(xmit_fifo_size, S_IRUSR | S_IRGRP, uart_get_attr_xmit_fifo_size, NULL); 25786915c0e4STomas Hlavacek static DEVICE_ATTR(uartclk, S_IRUSR | S_IRGRP, uart_get_attr_uartclk, NULL); 2579373bac4cSAlan Cox static DEVICE_ATTR(close_delay, S_IRUSR | S_IRGRP, uart_get_attr_close_delay, NULL); 2580373bac4cSAlan Cox static DEVICE_ATTR(closing_wait, S_IRUSR | S_IRGRP, uart_get_attr_closing_wait, NULL); 2581373bac4cSAlan Cox static DEVICE_ATTR(custom_divisor, S_IRUSR | S_IRGRP, uart_get_attr_custom_divisor, NULL); 2582373bac4cSAlan Cox static DEVICE_ATTR(io_type, S_IRUSR | S_IRGRP, uart_get_attr_io_type, NULL); 2583373bac4cSAlan Cox static DEVICE_ATTR(iomem_base, S_IRUSR | S_IRGRP, uart_get_attr_iomem_base, NULL); 2584373bac4cSAlan Cox static DEVICE_ATTR(iomem_reg_shift, S_IRUSR | S_IRGRP, uart_get_attr_iomem_reg_shift, NULL); 25856915c0e4STomas Hlavacek 25866915c0e4STomas Hlavacek static struct attribute *tty_dev_attrs[] = { 2587373bac4cSAlan Cox &dev_attr_type.attr, 2588373bac4cSAlan Cox &dev_attr_line.attr, 2589373bac4cSAlan Cox &dev_attr_port.attr, 2590373bac4cSAlan Cox &dev_attr_irq.attr, 2591373bac4cSAlan Cox &dev_attr_flags.attr, 2592373bac4cSAlan Cox &dev_attr_xmit_fifo_size.attr, 25936915c0e4STomas Hlavacek &dev_attr_uartclk.attr, 2594373bac4cSAlan Cox &dev_attr_close_delay.attr, 2595373bac4cSAlan Cox &dev_attr_closing_wait.attr, 2596373bac4cSAlan Cox &dev_attr_custom_divisor.attr, 2597373bac4cSAlan Cox &dev_attr_io_type.attr, 2598373bac4cSAlan Cox &dev_attr_iomem_base.attr, 2599373bac4cSAlan Cox &dev_attr_iomem_reg_shift.attr, 26006915c0e4STomas Hlavacek NULL, 26016915c0e4STomas Hlavacek }; 26026915c0e4STomas Hlavacek 2603b1b79916STomas Hlavacek static const struct attribute_group tty_dev_attr_group = { 26046915c0e4STomas Hlavacek .attrs = tty_dev_attrs, 26056915c0e4STomas Hlavacek }; 26066915c0e4STomas Hlavacek 2607ab4382d2SGreg Kroah-Hartman /** 2608ab4382d2SGreg Kroah-Hartman * uart_add_one_port - attach a driver-defined port structure 2609ab4382d2SGreg Kroah-Hartman * @drv: pointer to the uart low level driver structure for this port 2610ab4382d2SGreg Kroah-Hartman * @uport: uart port structure to use for this port. 2611ab4382d2SGreg Kroah-Hartman * 2612ab4382d2SGreg Kroah-Hartman * This allows the driver to register its own uart_port structure 2613ab4382d2SGreg Kroah-Hartman * with the core driver. The main purpose is to allow the low 2614ab4382d2SGreg Kroah-Hartman * level uart drivers to expand uart_port, rather than having yet 2615ab4382d2SGreg Kroah-Hartman * more levels of structures. 2616ab4382d2SGreg Kroah-Hartman */ 2617ab4382d2SGreg Kroah-Hartman int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport) 2618ab4382d2SGreg Kroah-Hartman { 2619ab4382d2SGreg Kroah-Hartman struct uart_state *state; 2620ab4382d2SGreg Kroah-Hartman struct tty_port *port; 2621ab4382d2SGreg Kroah-Hartman int ret = 0; 2622ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 2623266dcff0SGreg Kroah-Hartman int num_groups; 2624ab4382d2SGreg Kroah-Hartman 2625ab4382d2SGreg Kroah-Hartman BUG_ON(in_interrupt()); 2626ab4382d2SGreg Kroah-Hartman 2627ab4382d2SGreg Kroah-Hartman if (uport->line >= drv->nr) 2628ab4382d2SGreg Kroah-Hartman return -EINVAL; 2629ab4382d2SGreg Kroah-Hartman 2630ab4382d2SGreg Kroah-Hartman state = drv->state + uport->line; 2631ab4382d2SGreg Kroah-Hartman port = &state->port; 2632ab4382d2SGreg Kroah-Hartman 2633ab4382d2SGreg Kroah-Hartman mutex_lock(&port_mutex); 2634ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2635ab4382d2SGreg Kroah-Hartman if (state->uart_port) { 2636ab4382d2SGreg Kroah-Hartman ret = -EINVAL; 2637ab4382d2SGreg Kroah-Hartman goto out; 2638ab4382d2SGreg Kroah-Hartman } 2639ab4382d2SGreg Kroah-Hartman 26402b702b9bSPeter Hurley /* Link the port to the driver state table and vice versa */ 2641ab4382d2SGreg Kroah-Hartman state->uart_port = uport; 2642ab4382d2SGreg Kroah-Hartman uport->state = state; 2643ab4382d2SGreg Kroah-Hartman 26442b702b9bSPeter Hurley state->pm_state = UART_PM_STATE_UNDEFINED; 26452b702b9bSPeter Hurley uport->cons = drv->cons; 26462b702b9bSPeter Hurley 2647ab4382d2SGreg Kroah-Hartman /* 2648ab4382d2SGreg Kroah-Hartman * If this port is a console, then the spinlock is already 2649ab4382d2SGreg Kroah-Hartman * initialised. 2650ab4382d2SGreg Kroah-Hartman */ 2651ab4382d2SGreg Kroah-Hartman if (!(uart_console(uport) && (uport->cons->flags & CON_ENABLED))) { 2652ab4382d2SGreg Kroah-Hartman spin_lock_init(&uport->lock); 2653ab4382d2SGreg Kroah-Hartman lockdep_set_class(&uport->lock, &port_lock_key); 2654ab4382d2SGreg Kroah-Hartman } 2655a208ffd2SGrant Likely if (uport->cons && uport->dev) 2656a208ffd2SGrant Likely of_console_check(uport->dev->of_node, uport->cons->name, uport->line); 2657ab4382d2SGreg Kroah-Hartman 2658ab4382d2SGreg Kroah-Hartman uart_configure_port(drv, state, uport); 2659ab4382d2SGreg Kroah-Hartman 2660266dcff0SGreg Kroah-Hartman num_groups = 2; 2661266dcff0SGreg Kroah-Hartman if (uport->attr_group) 2662266dcff0SGreg Kroah-Hartman num_groups++; 2663266dcff0SGreg Kroah-Hartman 2664c2b703b8SYoshihiro YUNOMAE uport->tty_groups = kcalloc(num_groups, sizeof(*uport->tty_groups), 2665266dcff0SGreg Kroah-Hartman GFP_KERNEL); 2666266dcff0SGreg Kroah-Hartman if (!uport->tty_groups) { 2667266dcff0SGreg Kroah-Hartman ret = -ENOMEM; 2668266dcff0SGreg Kroah-Hartman goto out; 2669266dcff0SGreg Kroah-Hartman } 2670266dcff0SGreg Kroah-Hartman uport->tty_groups[0] = &tty_dev_attr_group; 2671266dcff0SGreg Kroah-Hartman if (uport->attr_group) 2672266dcff0SGreg Kroah-Hartman uport->tty_groups[1] = uport->attr_group; 2673266dcff0SGreg Kroah-Hartman 2674ab4382d2SGreg Kroah-Hartman /* 2675ab4382d2SGreg Kroah-Hartman * Register the port whether it's detected or not. This allows 2676015355b7SGeert Uytterhoeven * setserial to be used to alter this port's parameters. 2677ab4382d2SGreg Kroah-Hartman */ 2678b1b79916STomas Hlavacek tty_dev = tty_port_register_device_attr(port, drv->tty_driver, 2679266dcff0SGreg Kroah-Hartman uport->line, uport->dev, port, uport->tty_groups); 2680ab4382d2SGreg Kroah-Hartman if (likely(!IS_ERR(tty_dev))) { 268177359835SSimon Glass device_set_wakeup_capable(tty_dev, 1); 268277359835SSimon Glass } else { 26832f2dafe7SSudip Mukherjee dev_err(uport->dev, "Cannot register tty device on line %d\n", 2684ab4382d2SGreg Kroah-Hartman uport->line); 268577359835SSimon Glass } 2686ab4382d2SGreg Kroah-Hartman 2687ab4382d2SGreg Kroah-Hartman /* 2688ab4382d2SGreg Kroah-Hartman * Ensure UPF_DEAD is not set. 2689ab4382d2SGreg Kroah-Hartman */ 2690ab4382d2SGreg Kroah-Hartman uport->flags &= ~UPF_DEAD; 2691ab4382d2SGreg Kroah-Hartman 2692ab4382d2SGreg Kroah-Hartman out: 2693ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2694ab4382d2SGreg Kroah-Hartman mutex_unlock(&port_mutex); 2695ab4382d2SGreg Kroah-Hartman 2696ab4382d2SGreg Kroah-Hartman return ret; 2697ab4382d2SGreg Kroah-Hartman } 2698ab4382d2SGreg Kroah-Hartman 2699ab4382d2SGreg Kroah-Hartman /** 2700ab4382d2SGreg Kroah-Hartman * uart_remove_one_port - detach a driver defined port structure 2701ab4382d2SGreg Kroah-Hartman * @drv: pointer to the uart low level driver structure for this port 2702ab4382d2SGreg Kroah-Hartman * @uport: uart port structure for this port 2703ab4382d2SGreg Kroah-Hartman * 2704ab4382d2SGreg Kroah-Hartman * This unhooks (and hangs up) the specified port structure from the 2705ab4382d2SGreg Kroah-Hartman * core driver. No further calls will be made to the low-level code 2706ab4382d2SGreg Kroah-Hartman * for this port. 2707ab4382d2SGreg Kroah-Hartman */ 2708ab4382d2SGreg Kroah-Hartman int uart_remove_one_port(struct uart_driver *drv, struct uart_port *uport) 2709ab4382d2SGreg Kroah-Hartman { 2710ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 2711ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 27124c6d5b4dSGeert Uytterhoeven struct tty_struct *tty; 2713b342dd51SChen Gang int ret = 0; 2714ab4382d2SGreg Kroah-Hartman 2715ab4382d2SGreg Kroah-Hartman BUG_ON(in_interrupt()); 2716ab4382d2SGreg Kroah-Hartman 2717ab4382d2SGreg Kroah-Hartman if (state->uart_port != uport) 27182f2dafe7SSudip Mukherjee dev_alert(uport->dev, "Removing wrong port: %p != %p\n", 2719ab4382d2SGreg Kroah-Hartman state->uart_port, uport); 2720ab4382d2SGreg Kroah-Hartman 2721ab4382d2SGreg Kroah-Hartman mutex_lock(&port_mutex); 2722ab4382d2SGreg Kroah-Hartman 2723ab4382d2SGreg Kroah-Hartman /* 2724ab4382d2SGreg Kroah-Hartman * Mark the port "dead" - this prevents any opens from 2725ab4382d2SGreg Kroah-Hartman * succeeding while we shut down the port. 2726ab4382d2SGreg Kroah-Hartman */ 2727ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2728b342dd51SChen Gang if (!state->uart_port) { 2729b342dd51SChen Gang mutex_unlock(&port->mutex); 2730b342dd51SChen Gang ret = -EINVAL; 2731b342dd51SChen Gang goto out; 2732b342dd51SChen Gang } 2733ab4382d2SGreg Kroah-Hartman uport->flags |= UPF_DEAD; 2734ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2735ab4382d2SGreg Kroah-Hartman 2736ab4382d2SGreg Kroah-Hartman /* 2737ab4382d2SGreg Kroah-Hartman * Remove the devices from the tty layer 2738ab4382d2SGreg Kroah-Hartman */ 2739ab4382d2SGreg Kroah-Hartman tty_unregister_device(drv->tty_driver, uport->line); 2740ab4382d2SGreg Kroah-Hartman 27414c6d5b4dSGeert Uytterhoeven tty = tty_port_tty_get(port); 27424c6d5b4dSGeert Uytterhoeven if (tty) { 2743ab4382d2SGreg Kroah-Hartman tty_vhangup(port->tty); 27444c6d5b4dSGeert Uytterhoeven tty_kref_put(tty); 27454c6d5b4dSGeert Uytterhoeven } 2746ab4382d2SGreg Kroah-Hartman 2747ab4382d2SGreg Kroah-Hartman /* 27485f5c9ae5SGeert Uytterhoeven * If the port is used as a console, unregister it 27495f5c9ae5SGeert Uytterhoeven */ 27505f5c9ae5SGeert Uytterhoeven if (uart_console(uport)) 27515f5c9ae5SGeert Uytterhoeven unregister_console(uport->cons); 27525f5c9ae5SGeert Uytterhoeven 27535f5c9ae5SGeert Uytterhoeven /* 2754ab4382d2SGreg Kroah-Hartman * Free the port IO and memory resources, if any. 2755ab4382d2SGreg Kroah-Hartman */ 2756ab4382d2SGreg Kroah-Hartman if (uport->type != PORT_UNKNOWN) 2757ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 2758266dcff0SGreg Kroah-Hartman kfree(uport->tty_groups); 2759ab4382d2SGreg Kroah-Hartman 2760ab4382d2SGreg Kroah-Hartman /* 2761ab4382d2SGreg Kroah-Hartman * Indicate that there isn't a port here anymore. 2762ab4382d2SGreg Kroah-Hartman */ 2763ab4382d2SGreg Kroah-Hartman uport->type = PORT_UNKNOWN; 2764ab4382d2SGreg Kroah-Hartman 2765ab4382d2SGreg Kroah-Hartman state->uart_port = NULL; 2766b342dd51SChen Gang out: 2767ab4382d2SGreg Kroah-Hartman mutex_unlock(&port_mutex); 2768ab4382d2SGreg Kroah-Hartman 2769b342dd51SChen Gang return ret; 2770ab4382d2SGreg Kroah-Hartman } 2771ab4382d2SGreg Kroah-Hartman 2772ab4382d2SGreg Kroah-Hartman /* 2773ab4382d2SGreg Kroah-Hartman * Are the two ports equivalent? 2774ab4382d2SGreg Kroah-Hartman */ 2775ab4382d2SGreg Kroah-Hartman int uart_match_port(struct uart_port *port1, struct uart_port *port2) 2776ab4382d2SGreg Kroah-Hartman { 2777ab4382d2SGreg Kroah-Hartman if (port1->iotype != port2->iotype) 2778ab4382d2SGreg Kroah-Hartman return 0; 2779ab4382d2SGreg Kroah-Hartman 2780ab4382d2SGreg Kroah-Hartman switch (port1->iotype) { 2781ab4382d2SGreg Kroah-Hartman case UPIO_PORT: 2782ab4382d2SGreg Kroah-Hartman return (port1->iobase == port2->iobase); 2783ab4382d2SGreg Kroah-Hartman case UPIO_HUB6: 2784ab4382d2SGreg Kroah-Hartman return (port1->iobase == port2->iobase) && 2785ab4382d2SGreg Kroah-Hartman (port1->hub6 == port2->hub6); 2786ab4382d2SGreg Kroah-Hartman case UPIO_MEM: 2787ab4382d2SGreg Kroah-Hartman case UPIO_MEM32: 2788ab4382d2SGreg Kroah-Hartman case UPIO_AU: 2789ab4382d2SGreg Kroah-Hartman case UPIO_TSI: 2790ab4382d2SGreg Kroah-Hartman return (port1->mapbase == port2->mapbase); 2791ab4382d2SGreg Kroah-Hartman } 2792ab4382d2SGreg Kroah-Hartman return 0; 2793ab4382d2SGreg Kroah-Hartman } 2794ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_match_port); 2795ab4382d2SGreg Kroah-Hartman 2796027d7dacSJiri Slaby /** 2797027d7dacSJiri Slaby * uart_handle_dcd_change - handle a change of carrier detect state 2798027d7dacSJiri Slaby * @uport: uart_port structure for the open port 2799027d7dacSJiri Slaby * @status: new carrier detect status, nonzero if active 28004d90bb14SPeter Hurley * 28014d90bb14SPeter Hurley * Caller must hold uport->lock 2802027d7dacSJiri Slaby */ 2803027d7dacSJiri Slaby void uart_handle_dcd_change(struct uart_port *uport, unsigned int status) 2804027d7dacSJiri Slaby { 280542381572SGeorge Spelvin struct tty_port *port = &uport->state->port; 280643eca0aeSAlan Cox struct tty_struct *tty = port->tty; 2807c993257bSPeter Hurley struct tty_ldisc *ld; 2808027d7dacSJiri Slaby 28094d90bb14SPeter Hurley lockdep_assert_held_once(&uport->lock); 28104d90bb14SPeter Hurley 2811c993257bSPeter Hurley if (tty) { 2812c993257bSPeter Hurley ld = tty_ldisc_ref(tty); 281342381572SGeorge Spelvin if (ld) { 281442381572SGeorge Spelvin if (ld->ops->dcd_change) 2815593fb1aeSGeorge Spelvin ld->ops->dcd_change(tty, status); 281642381572SGeorge Spelvin tty_ldisc_deref(ld); 281742381572SGeorge Spelvin } 2818c993257bSPeter Hurley } 2819027d7dacSJiri Slaby 2820027d7dacSJiri Slaby uport->icount.dcd++; 2821027d7dacSJiri Slaby 2822299245a1SPeter Hurley if (uart_dcd_enabled(uport)) { 2823027d7dacSJiri Slaby if (status) 2824027d7dacSJiri Slaby wake_up_interruptible(&port->open_wait); 282543eca0aeSAlan Cox else if (tty) 282643eca0aeSAlan Cox tty_hangup(tty); 2827027d7dacSJiri Slaby } 2828027d7dacSJiri Slaby } 2829027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_handle_dcd_change); 2830027d7dacSJiri Slaby 2831027d7dacSJiri Slaby /** 2832027d7dacSJiri Slaby * uart_handle_cts_change - handle a change of clear-to-send state 2833027d7dacSJiri Slaby * @uport: uart_port structure for the open port 2834027d7dacSJiri Slaby * @status: new clear to send status, nonzero if active 28354d90bb14SPeter Hurley * 28364d90bb14SPeter Hurley * Caller must hold uport->lock 2837027d7dacSJiri Slaby */ 2838027d7dacSJiri Slaby void uart_handle_cts_change(struct uart_port *uport, unsigned int status) 2839027d7dacSJiri Slaby { 28404d90bb14SPeter Hurley lockdep_assert_held_once(&uport->lock); 28414d90bb14SPeter Hurley 2842027d7dacSJiri Slaby uport->icount.cts++; 2843027d7dacSJiri Slaby 2844299245a1SPeter Hurley if (uart_cts_enabled(uport)) { 2845d01f4d18SPeter Hurley if (uport->hw_stopped) { 2846027d7dacSJiri Slaby if (status) { 2847d01f4d18SPeter Hurley uport->hw_stopped = 0; 2848027d7dacSJiri Slaby uport->ops->start_tx(uport); 2849027d7dacSJiri Slaby uart_write_wakeup(uport); 2850027d7dacSJiri Slaby } 2851027d7dacSJiri Slaby } else { 2852027d7dacSJiri Slaby if (!status) { 2853d01f4d18SPeter Hurley uport->hw_stopped = 1; 2854027d7dacSJiri Slaby uport->ops->stop_tx(uport); 2855027d7dacSJiri Slaby } 2856027d7dacSJiri Slaby } 2857027d7dacSJiri Slaby } 2858027d7dacSJiri Slaby } 2859027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_handle_cts_change); 2860027d7dacSJiri Slaby 2861cf75525fSJiri Slaby /** 2862cf75525fSJiri Slaby * uart_insert_char - push a char to the uart layer 2863cf75525fSJiri Slaby * 2864cf75525fSJiri Slaby * User is responsible to call tty_flip_buffer_push when they are done with 2865cf75525fSJiri Slaby * insertion. 2866cf75525fSJiri Slaby * 2867cf75525fSJiri Slaby * @port: corresponding port 2868cf75525fSJiri Slaby * @status: state of the serial port RX buffer (LSR for 8250) 2869cf75525fSJiri Slaby * @overrun: mask of overrun bits in @status 2870cf75525fSJiri Slaby * @ch: character to push 2871cf75525fSJiri Slaby * @flag: flag for the character (see TTY_NORMAL and friends) 2872cf75525fSJiri Slaby */ 2873027d7dacSJiri Slaby void uart_insert_char(struct uart_port *port, unsigned int status, 2874027d7dacSJiri Slaby unsigned int overrun, unsigned int ch, unsigned int flag) 2875027d7dacSJiri Slaby { 287692a19f9cSJiri Slaby struct tty_port *tport = &port->state->port; 2877027d7dacSJiri Slaby 2878027d7dacSJiri Slaby if ((status & port->ignore_status_mask & ~overrun) == 0) 287992a19f9cSJiri Slaby if (tty_insert_flip_char(tport, ch, flag) == 0) 2880dabfb351SCorbin ++port->icount.buf_overrun; 2881027d7dacSJiri Slaby 2882027d7dacSJiri Slaby /* 2883027d7dacSJiri Slaby * Overrun is special. Since it's reported immediately, 2884027d7dacSJiri Slaby * it doesn't affect the current character. 2885027d7dacSJiri Slaby */ 2886027d7dacSJiri Slaby if (status & ~port->ignore_status_mask & overrun) 288792a19f9cSJiri Slaby if (tty_insert_flip_char(tport, 0, TTY_OVERRUN) == 0) 2888dabfb351SCorbin ++port->icount.buf_overrun; 2889027d7dacSJiri Slaby } 2890027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_insert_char); 2891027d7dacSJiri Slaby 2892ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_write_wakeup); 2893ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_register_driver); 2894ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_unregister_driver); 2895ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_suspend_port); 2896ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_resume_port); 2897ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_add_one_port); 2898ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_remove_one_port); 2899ab4382d2SGreg Kroah-Hartman 2900ab4382d2SGreg Kroah-Hartman MODULE_DESCRIPTION("Serial driver core"); 2901ab4382d2SGreg Kroah-Hartman MODULE_LICENSE("GPL"); 2902