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 62ab4382d2SGreg Kroah-Hartman /* 63ab4382d2SGreg Kroah-Hartman * This routine is used by the interrupt handler to schedule processing in 64ab4382d2SGreg Kroah-Hartman * the software interrupt portion of the driver. 65ab4382d2SGreg Kroah-Hartman */ 66ab4382d2SGreg Kroah-Hartman void uart_write_wakeup(struct uart_port *port) 67ab4382d2SGreg Kroah-Hartman { 68ab4382d2SGreg Kroah-Hartman struct uart_state *state = port->state; 69ab4382d2SGreg Kroah-Hartman /* 70ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 71ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 72ab4382d2SGreg Kroah-Hartman */ 73ab4382d2SGreg Kroah-Hartman BUG_ON(!state); 746a3e492bSJiri Slaby tty_wakeup(state->port.tty); 75ab4382d2SGreg Kroah-Hartman } 76ab4382d2SGreg Kroah-Hartman 77ab4382d2SGreg Kroah-Hartman static void uart_stop(struct tty_struct *tty) 78ab4382d2SGreg Kroah-Hartman { 79ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 80ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 81ab4382d2SGreg Kroah-Hartman unsigned long flags; 82ab4382d2SGreg Kroah-Hartman 83ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 84ab4382d2SGreg Kroah-Hartman port->ops->stop_tx(port); 85ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 86ab4382d2SGreg Kroah-Hartman } 87ab4382d2SGreg Kroah-Hartman 88ab4382d2SGreg Kroah-Hartman static void __uart_start(struct tty_struct *tty) 89ab4382d2SGreg Kroah-Hartman { 90ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 91ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 92ab4382d2SGreg Kroah-Hartman 93717f3bbaSSeth Bollinger if (!tty->stopped && !tty->hw_stopped) 94ab4382d2SGreg Kroah-Hartman port->ops->start_tx(port); 95ab4382d2SGreg Kroah-Hartman } 96ab4382d2SGreg Kroah-Hartman 97ab4382d2SGreg Kroah-Hartman static void uart_start(struct tty_struct *tty) 98ab4382d2SGreg Kroah-Hartman { 99ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 100ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 101ab4382d2SGreg Kroah-Hartman unsigned long flags; 102ab4382d2SGreg Kroah-Hartman 103ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 104ab4382d2SGreg Kroah-Hartman __uart_start(tty); 105ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 106ab4382d2SGreg Kroah-Hartman } 107ab4382d2SGreg Kroah-Hartman 108ab4382d2SGreg Kroah-Hartman static inline void 109ab4382d2SGreg Kroah-Hartman uart_update_mctrl(struct uart_port *port, unsigned int set, unsigned int clear) 110ab4382d2SGreg Kroah-Hartman { 111ab4382d2SGreg Kroah-Hartman unsigned long flags; 112ab4382d2SGreg Kroah-Hartman unsigned int old; 113ab4382d2SGreg Kroah-Hartman 114ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 115ab4382d2SGreg Kroah-Hartman old = port->mctrl; 116ab4382d2SGreg Kroah-Hartman port->mctrl = (old & ~clear) | set; 117ab4382d2SGreg Kroah-Hartman if (old != port->mctrl) 118ab4382d2SGreg Kroah-Hartman port->ops->set_mctrl(port, port->mctrl); 119ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 120ab4382d2SGreg Kroah-Hartman } 121ab4382d2SGreg Kroah-Hartman 122ab4382d2SGreg Kroah-Hartman #define uart_set_mctrl(port, set) uart_update_mctrl(port, set, 0) 123ab4382d2SGreg Kroah-Hartman #define uart_clear_mctrl(port, clear) uart_update_mctrl(port, 0, clear) 124ab4382d2SGreg Kroah-Hartman 125ab4382d2SGreg Kroah-Hartman /* 126ab4382d2SGreg Kroah-Hartman * Startup the port. This will be called once per open. All calls 127ab4382d2SGreg Kroah-Hartman * will be serialised by the per-port mutex. 128ab4382d2SGreg Kroah-Hartman */ 129c0d92be6SJiri Slaby static int uart_port_startup(struct tty_struct *tty, struct uart_state *state, 130c0d92be6SJiri Slaby int init_hw) 131ab4382d2SGreg Kroah-Hartman { 132ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 133ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 134ab4382d2SGreg Kroah-Hartman unsigned long page; 135ab4382d2SGreg Kroah-Hartman int retval = 0; 136ab4382d2SGreg Kroah-Hartman 137ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) 138c0d92be6SJiri Slaby return 1; 139ab4382d2SGreg Kroah-Hartman 140ab4382d2SGreg Kroah-Hartman /* 1417deb39edSThomas Pfaff * Make sure the device is in D0 state. 1427deb39edSThomas Pfaff */ 1437deb39edSThomas Pfaff uart_change_pm(state, UART_PM_STATE_ON); 1447deb39edSThomas Pfaff 1457deb39edSThomas Pfaff /* 146ab4382d2SGreg Kroah-Hartman * Initialise and allocate the transmit and temporary 147ab4382d2SGreg Kroah-Hartman * buffer. 148ab4382d2SGreg Kroah-Hartman */ 149ab4382d2SGreg Kroah-Hartman if (!state->xmit.buf) { 150ab4382d2SGreg Kroah-Hartman /* This is protected by the per port mutex */ 151ab4382d2SGreg Kroah-Hartman page = get_zeroed_page(GFP_KERNEL); 152ab4382d2SGreg Kroah-Hartman if (!page) 153ab4382d2SGreg Kroah-Hartman return -ENOMEM; 154ab4382d2SGreg Kroah-Hartman 155ab4382d2SGreg Kroah-Hartman state->xmit.buf = (unsigned char *) page; 156ab4382d2SGreg Kroah-Hartman uart_circ_clear(&state->xmit); 157ab4382d2SGreg Kroah-Hartman } 158ab4382d2SGreg Kroah-Hartman 159ab4382d2SGreg Kroah-Hartman retval = uport->ops->startup(uport); 160ab4382d2SGreg Kroah-Hartman if (retval == 0) { 161c7d7abffSJiri Slaby if (uart_console(uport) && uport->cons->cflag) { 162adc8d746SAlan Cox tty->termios.c_cflag = uport->cons->cflag; 163c7d7abffSJiri Slaby uport->cons->cflag = 0; 164c7d7abffSJiri Slaby } 165ab4382d2SGreg Kroah-Hartman /* 166ab4382d2SGreg Kroah-Hartman * Initialise the hardware port settings. 167ab4382d2SGreg Kroah-Hartman */ 168ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 169ab4382d2SGreg Kroah-Hartman 170c7d7abffSJiri Slaby if (init_hw) { 171ab4382d2SGreg Kroah-Hartman /* 172ab4382d2SGreg Kroah-Hartman * Setup the RTS and DTR signals once the 173ab4382d2SGreg Kroah-Hartman * port is open and ready to respond. 174ab4382d2SGreg Kroah-Hartman */ 175adc8d746SAlan Cox if (tty->termios.c_cflag & CBAUD) 176ab4382d2SGreg Kroah-Hartman uart_set_mctrl(uport, TIOCM_RTS | TIOCM_DTR); 177ab4382d2SGreg Kroah-Hartman } 178a6eec92eSPeter Hurley 179a6eec92eSPeter Hurley if (tty_port_cts_enabled(port)) { 180ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 181ab4382d2SGreg Kroah-Hartman if (!(uport->ops->get_mctrl(uport) & TIOCM_CTS)) 182ab4382d2SGreg Kroah-Hartman tty->hw_stopped = 1; 183ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 184ab4382d2SGreg Kroah-Hartman } 185ab4382d2SGreg Kroah-Hartman } 186ab4382d2SGreg Kroah-Hartman 1870055197eSJiri Slaby /* 1880055197eSJiri Slaby * This is to allow setserial on this port. People may want to set 1890055197eSJiri Slaby * port/irq/type and then reconfigure the port properly if it failed 1900055197eSJiri Slaby * now. 1910055197eSJiri Slaby */ 192ab4382d2SGreg Kroah-Hartman if (retval && capable(CAP_SYS_ADMIN)) 193c0d92be6SJiri Slaby return 1; 194c0d92be6SJiri Slaby 195c0d92be6SJiri Slaby return retval; 196c0d92be6SJiri Slaby } 197c0d92be6SJiri Slaby 198c0d92be6SJiri Slaby static int uart_startup(struct tty_struct *tty, struct uart_state *state, 199c0d92be6SJiri Slaby int init_hw) 200c0d92be6SJiri Slaby { 201c0d92be6SJiri Slaby struct tty_port *port = &state->port; 202c0d92be6SJiri Slaby int retval; 203c0d92be6SJiri Slaby 204c0d92be6SJiri Slaby if (port->flags & ASYNC_INITIALIZED) 205c0d92be6SJiri Slaby return 0; 206c0d92be6SJiri Slaby 207c0d92be6SJiri Slaby /* 208c0d92be6SJiri Slaby * Set the TTY IO error marker - we will only clear this 209c0d92be6SJiri Slaby * once we have successfully opened the port. 210c0d92be6SJiri Slaby */ 211c0d92be6SJiri Slaby set_bit(TTY_IO_ERROR, &tty->flags); 212c0d92be6SJiri Slaby 213c0d92be6SJiri Slaby retval = uart_port_startup(tty, state, init_hw); 214c0d92be6SJiri Slaby if (!retval) { 215c0d92be6SJiri Slaby set_bit(ASYNCB_INITIALIZED, &port->flags); 216c0d92be6SJiri Slaby clear_bit(TTY_IO_ERROR, &tty->flags); 217c0d92be6SJiri Slaby } else if (retval > 0) 218ab4382d2SGreg Kroah-Hartman retval = 0; 219ab4382d2SGreg Kroah-Hartman 220ab4382d2SGreg Kroah-Hartman return retval; 221ab4382d2SGreg Kroah-Hartman } 222ab4382d2SGreg Kroah-Hartman 223ab4382d2SGreg Kroah-Hartman /* 224ab4382d2SGreg Kroah-Hartman * This routine will shutdown a serial port; interrupts are disabled, and 225ab4382d2SGreg Kroah-Hartman * DTR is dropped if the hangup on close termio flag is on. Calls to 226ab4382d2SGreg Kroah-Hartman * uart_shutdown are serialised by the per-port semaphore. 227ab4382d2SGreg Kroah-Hartman */ 228ab4382d2SGreg Kroah-Hartman static void uart_shutdown(struct tty_struct *tty, struct uart_state *state) 229ab4382d2SGreg Kroah-Hartman { 230ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 231ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 232ab4382d2SGreg Kroah-Hartman 233ab4382d2SGreg Kroah-Hartman /* 234ab4382d2SGreg Kroah-Hartman * Set the TTY IO error marker 235ab4382d2SGreg Kroah-Hartman */ 236ab4382d2SGreg Kroah-Hartman if (tty) 237ab4382d2SGreg Kroah-Hartman set_bit(TTY_IO_ERROR, &tty->flags); 238ab4382d2SGreg Kroah-Hartman 239ab4382d2SGreg Kroah-Hartman if (test_and_clear_bit(ASYNCB_INITIALIZED, &port->flags)) { 240ab4382d2SGreg Kroah-Hartman /* 241ab4382d2SGreg Kroah-Hartman * Turn off DTR and RTS early. 242ab4382d2SGreg Kroah-Hartman */ 243ae84db96SPeter Hurley if (uart_console(uport) && tty) 244ae84db96SPeter Hurley uport->cons->cflag = tty->termios.c_cflag; 245ae84db96SPeter Hurley 246adc8d746SAlan Cox if (!tty || (tty->termios.c_cflag & HUPCL)) 247ab4382d2SGreg Kroah-Hartman uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); 248ab4382d2SGreg Kroah-Hartman 249b922e19dSJiri Slaby uart_port_shutdown(port); 250ab4382d2SGreg Kroah-Hartman } 251ab4382d2SGreg Kroah-Hartman 252ab4382d2SGreg Kroah-Hartman /* 253d208a3bfSDoug Anderson * It's possible for shutdown to be called after suspend if we get 254d208a3bfSDoug Anderson * a DCD drop (hangup) at just the right time. Clear suspended bit so 255d208a3bfSDoug Anderson * we don't try to resume a port that has been shutdown. 256ab4382d2SGreg Kroah-Hartman */ 257d208a3bfSDoug Anderson clear_bit(ASYNCB_SUSPENDED, &port->flags); 258ab4382d2SGreg Kroah-Hartman 259ab4382d2SGreg Kroah-Hartman /* 260ab4382d2SGreg Kroah-Hartman * Free the transmit buffer page. 261ab4382d2SGreg Kroah-Hartman */ 262ab4382d2SGreg Kroah-Hartman if (state->xmit.buf) { 263ab4382d2SGreg Kroah-Hartman free_page((unsigned long)state->xmit.buf); 264ab4382d2SGreg Kroah-Hartman state->xmit.buf = NULL; 265ab4382d2SGreg Kroah-Hartman } 266ab4382d2SGreg Kroah-Hartman } 267ab4382d2SGreg Kroah-Hartman 268ab4382d2SGreg Kroah-Hartman /** 269ab4382d2SGreg Kroah-Hartman * uart_update_timeout - update per-port FIFO timeout. 270ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port 271ab4382d2SGreg Kroah-Hartman * @cflag: termios cflag value 272ab4382d2SGreg Kroah-Hartman * @baud: speed of the port 273ab4382d2SGreg Kroah-Hartman * 274ab4382d2SGreg Kroah-Hartman * Set the port FIFO timeout value. The @cflag value should 275ab4382d2SGreg Kroah-Hartman * reflect the actual hardware settings. 276ab4382d2SGreg Kroah-Hartman */ 277ab4382d2SGreg Kroah-Hartman void 278ab4382d2SGreg Kroah-Hartman uart_update_timeout(struct uart_port *port, unsigned int cflag, 279ab4382d2SGreg Kroah-Hartman unsigned int baud) 280ab4382d2SGreg Kroah-Hartman { 281ab4382d2SGreg Kroah-Hartman unsigned int bits; 282ab4382d2SGreg Kroah-Hartman 283ab4382d2SGreg Kroah-Hartman /* byte size and parity */ 284ab4382d2SGreg Kroah-Hartman switch (cflag & CSIZE) { 285ab4382d2SGreg Kroah-Hartman case CS5: 286ab4382d2SGreg Kroah-Hartman bits = 7; 287ab4382d2SGreg Kroah-Hartman break; 288ab4382d2SGreg Kroah-Hartman case CS6: 289ab4382d2SGreg Kroah-Hartman bits = 8; 290ab4382d2SGreg Kroah-Hartman break; 291ab4382d2SGreg Kroah-Hartman case CS7: 292ab4382d2SGreg Kroah-Hartman bits = 9; 293ab4382d2SGreg Kroah-Hartman break; 294ab4382d2SGreg Kroah-Hartman default: 295ab4382d2SGreg Kroah-Hartman bits = 10; 296ab4382d2SGreg Kroah-Hartman break; /* CS8 */ 297ab4382d2SGreg Kroah-Hartman } 298ab4382d2SGreg Kroah-Hartman 299ab4382d2SGreg Kroah-Hartman if (cflag & CSTOPB) 300ab4382d2SGreg Kroah-Hartman bits++; 301ab4382d2SGreg Kroah-Hartman if (cflag & PARENB) 302ab4382d2SGreg Kroah-Hartman bits++; 303ab4382d2SGreg Kroah-Hartman 304ab4382d2SGreg Kroah-Hartman /* 305ab4382d2SGreg Kroah-Hartman * The total number of bits to be transmitted in the fifo. 306ab4382d2SGreg Kroah-Hartman */ 307ab4382d2SGreg Kroah-Hartman bits = bits * port->fifosize; 308ab4382d2SGreg Kroah-Hartman 309ab4382d2SGreg Kroah-Hartman /* 310ab4382d2SGreg Kroah-Hartman * Figure the timeout to send the above number of bits. 311ab4382d2SGreg Kroah-Hartman * Add .02 seconds of slop 312ab4382d2SGreg Kroah-Hartman */ 313ab4382d2SGreg Kroah-Hartman port->timeout = (HZ * bits) / baud + HZ/50; 314ab4382d2SGreg Kroah-Hartman } 315ab4382d2SGreg Kroah-Hartman 316ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_update_timeout); 317ab4382d2SGreg Kroah-Hartman 318ab4382d2SGreg Kroah-Hartman /** 319ab4382d2SGreg Kroah-Hartman * uart_get_baud_rate - return baud rate for a particular port 320ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port in question. 321ab4382d2SGreg Kroah-Hartman * @termios: desired termios settings. 322ab4382d2SGreg Kroah-Hartman * @old: old termios (or NULL) 323ab4382d2SGreg Kroah-Hartman * @min: minimum acceptable baud rate 324ab4382d2SGreg Kroah-Hartman * @max: maximum acceptable baud rate 325ab4382d2SGreg Kroah-Hartman * 326ab4382d2SGreg Kroah-Hartman * Decode the termios structure into a numeric baud rate, 327ab4382d2SGreg Kroah-Hartman * taking account of the magic 38400 baud rate (with spd_* 328ab4382d2SGreg Kroah-Hartman * flags), and mapping the %B0 rate to 9600 baud. 329ab4382d2SGreg Kroah-Hartman * 330ab4382d2SGreg Kroah-Hartman * If the new baud rate is invalid, try the old termios setting. 331ab4382d2SGreg Kroah-Hartman * If it's still invalid, we try 9600 baud. 332ab4382d2SGreg Kroah-Hartman * 333ab4382d2SGreg Kroah-Hartman * Update the @termios structure to reflect the baud rate 334ab4382d2SGreg Kroah-Hartman * we're actually going to be using. Don't do this for the case 335ab4382d2SGreg Kroah-Hartman * where B0 is requested ("hang up"). 336ab4382d2SGreg Kroah-Hartman */ 337ab4382d2SGreg Kroah-Hartman unsigned int 338ab4382d2SGreg Kroah-Hartman uart_get_baud_rate(struct uart_port *port, struct ktermios *termios, 339ab4382d2SGreg Kroah-Hartman struct ktermios *old, unsigned int min, unsigned int max) 340ab4382d2SGreg Kroah-Hartman { 341ab4382d2SGreg Kroah-Hartman unsigned int try, baud, altbaud = 38400; 342ab4382d2SGreg Kroah-Hartman int hung_up = 0; 343ab4382d2SGreg Kroah-Hartman upf_t flags = port->flags & UPF_SPD_MASK; 344ab4382d2SGreg Kroah-Hartman 345ab4382d2SGreg Kroah-Hartman if (flags == UPF_SPD_HI) 346ab4382d2SGreg Kroah-Hartman altbaud = 57600; 347ab4382d2SGreg Kroah-Hartman else if (flags == UPF_SPD_VHI) 348ab4382d2SGreg Kroah-Hartman altbaud = 115200; 349ab4382d2SGreg Kroah-Hartman else if (flags == UPF_SPD_SHI) 350ab4382d2SGreg Kroah-Hartman altbaud = 230400; 351ab4382d2SGreg Kroah-Hartman else if (flags == UPF_SPD_WARP) 352ab4382d2SGreg Kroah-Hartman altbaud = 460800; 353ab4382d2SGreg Kroah-Hartman 354ab4382d2SGreg Kroah-Hartman for (try = 0; try < 2; try++) { 355ab4382d2SGreg Kroah-Hartman baud = tty_termios_baud_rate(termios); 356ab4382d2SGreg Kroah-Hartman 357ab4382d2SGreg Kroah-Hartman /* 358ab4382d2SGreg Kroah-Hartman * The spd_hi, spd_vhi, spd_shi, spd_warp kludge... 359ab4382d2SGreg Kroah-Hartman * Die! Die! Die! 360ab4382d2SGreg Kroah-Hartman */ 361ab4382d2SGreg Kroah-Hartman if (baud == 38400) 362ab4382d2SGreg Kroah-Hartman baud = altbaud; 363ab4382d2SGreg Kroah-Hartman 364ab4382d2SGreg Kroah-Hartman /* 365ab4382d2SGreg Kroah-Hartman * Special case: B0 rate. 366ab4382d2SGreg Kroah-Hartman */ 367ab4382d2SGreg Kroah-Hartman if (baud == 0) { 368ab4382d2SGreg Kroah-Hartman hung_up = 1; 369ab4382d2SGreg Kroah-Hartman baud = 9600; 370ab4382d2SGreg Kroah-Hartman } 371ab4382d2SGreg Kroah-Hartman 372ab4382d2SGreg Kroah-Hartman if (baud >= min && baud <= max) 373ab4382d2SGreg Kroah-Hartman return baud; 374ab4382d2SGreg Kroah-Hartman 375ab4382d2SGreg Kroah-Hartman /* 376ab4382d2SGreg Kroah-Hartman * Oops, the quotient was zero. Try again with 377ab4382d2SGreg Kroah-Hartman * the old baud rate if possible. 378ab4382d2SGreg Kroah-Hartman */ 379ab4382d2SGreg Kroah-Hartman termios->c_cflag &= ~CBAUD; 380ab4382d2SGreg Kroah-Hartman if (old) { 381ab4382d2SGreg Kroah-Hartman baud = tty_termios_baud_rate(old); 382ab4382d2SGreg Kroah-Hartman if (!hung_up) 383ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 384ab4382d2SGreg Kroah-Hartman baud, baud); 385ab4382d2SGreg Kroah-Hartman old = NULL; 386ab4382d2SGreg Kroah-Hartman continue; 387ab4382d2SGreg Kroah-Hartman } 388ab4382d2SGreg Kroah-Hartman 389ab4382d2SGreg Kroah-Hartman /* 390ab4382d2SGreg Kroah-Hartman * As a last resort, if the range cannot be met then clip to 391ab4382d2SGreg Kroah-Hartman * the nearest chip supported rate. 392ab4382d2SGreg Kroah-Hartman */ 393ab4382d2SGreg Kroah-Hartman if (!hung_up) { 394ab4382d2SGreg Kroah-Hartman if (baud <= min) 395ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 396ab4382d2SGreg Kroah-Hartman min + 1, min + 1); 397ab4382d2SGreg Kroah-Hartman else 398ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 399ab4382d2SGreg Kroah-Hartman max - 1, max - 1); 400ab4382d2SGreg Kroah-Hartman } 401ab4382d2SGreg Kroah-Hartman } 402ab4382d2SGreg Kroah-Hartman /* Should never happen */ 403ab4382d2SGreg Kroah-Hartman WARN_ON(1); 404ab4382d2SGreg Kroah-Hartman return 0; 405ab4382d2SGreg Kroah-Hartman } 406ab4382d2SGreg Kroah-Hartman 407ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_get_baud_rate); 408ab4382d2SGreg Kroah-Hartman 409ab4382d2SGreg Kroah-Hartman /** 410ab4382d2SGreg Kroah-Hartman * uart_get_divisor - return uart clock divisor 411ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port. 412ab4382d2SGreg Kroah-Hartman * @baud: desired baud rate 413ab4382d2SGreg Kroah-Hartman * 414ab4382d2SGreg Kroah-Hartman * Calculate the uart clock divisor for the port. 415ab4382d2SGreg Kroah-Hartman */ 416ab4382d2SGreg Kroah-Hartman unsigned int 417ab4382d2SGreg Kroah-Hartman uart_get_divisor(struct uart_port *port, unsigned int baud) 418ab4382d2SGreg Kroah-Hartman { 419ab4382d2SGreg Kroah-Hartman unsigned int quot; 420ab4382d2SGreg Kroah-Hartman 421ab4382d2SGreg Kroah-Hartman /* 422ab4382d2SGreg Kroah-Hartman * Old custom speed handling. 423ab4382d2SGreg Kroah-Hartman */ 424ab4382d2SGreg Kroah-Hartman if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) 425ab4382d2SGreg Kroah-Hartman quot = port->custom_divisor; 426ab4382d2SGreg Kroah-Hartman else 42797d24634SUwe Kleine-König quot = DIV_ROUND_CLOSEST(port->uartclk, 16 * baud); 428ab4382d2SGreg Kroah-Hartman 429ab4382d2SGreg Kroah-Hartman return quot; 430ab4382d2SGreg Kroah-Hartman } 431ab4382d2SGreg Kroah-Hartman 432ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_get_divisor); 433ab4382d2SGreg Kroah-Hartman 434ab4382d2SGreg Kroah-Hartman /* FIXME: Consistent locking policy */ 435ab4382d2SGreg Kroah-Hartman static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, 436ab4382d2SGreg Kroah-Hartman struct ktermios *old_termios) 437ab4382d2SGreg Kroah-Hartman { 438ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 439ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 440ab4382d2SGreg Kroah-Hartman struct ktermios *termios; 441ab4382d2SGreg Kroah-Hartman 442ab4382d2SGreg Kroah-Hartman /* 443ab4382d2SGreg Kroah-Hartman * If we have no tty, termios, or the port does not exist, 444ab4382d2SGreg Kroah-Hartman * then we can't set the parameters for this port. 445ab4382d2SGreg Kroah-Hartman */ 446adc8d746SAlan Cox if (!tty || uport->type == PORT_UNKNOWN) 447ab4382d2SGreg Kroah-Hartman return; 448ab4382d2SGreg Kroah-Hartman 449adc8d746SAlan Cox termios = &tty->termios; 450c18b55fdSPeter Hurley uport->ops->set_termios(uport, termios, old_termios); 451ab4382d2SGreg Kroah-Hartman 452ab4382d2SGreg Kroah-Hartman /* 453ab4382d2SGreg Kroah-Hartman * Set flags based on termios cflag 454ab4382d2SGreg Kroah-Hartman */ 455ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CRTSCTS) 456ab4382d2SGreg Kroah-Hartman set_bit(ASYNCB_CTS_FLOW, &port->flags); 457ab4382d2SGreg Kroah-Hartman else 458ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_CTS_FLOW, &port->flags); 459ab4382d2SGreg Kroah-Hartman 460ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CLOCAL) 461ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_CHECK_CD, &port->flags); 462ab4382d2SGreg Kroah-Hartman else 463ab4382d2SGreg Kroah-Hartman set_bit(ASYNCB_CHECK_CD, &port->flags); 464ab4382d2SGreg Kroah-Hartman } 465ab4382d2SGreg Kroah-Hartman 466ab4382d2SGreg Kroah-Hartman static inline int __uart_put_char(struct uart_port *port, 467ab4382d2SGreg Kroah-Hartman struct circ_buf *circ, unsigned char c) 468ab4382d2SGreg Kroah-Hartman { 469ab4382d2SGreg Kroah-Hartman unsigned long flags; 470ab4382d2SGreg Kroah-Hartman int ret = 0; 471ab4382d2SGreg Kroah-Hartman 472ab4382d2SGreg Kroah-Hartman if (!circ->buf) 473ab4382d2SGreg Kroah-Hartman return 0; 474ab4382d2SGreg Kroah-Hartman 475ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 476ab4382d2SGreg Kroah-Hartman if (uart_circ_chars_free(circ) != 0) { 477ab4382d2SGreg Kroah-Hartman circ->buf[circ->head] = c; 478ab4382d2SGreg Kroah-Hartman circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1); 479ab4382d2SGreg Kroah-Hartman ret = 1; 480ab4382d2SGreg Kroah-Hartman } 481ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 482ab4382d2SGreg Kroah-Hartman return ret; 483ab4382d2SGreg Kroah-Hartman } 484ab4382d2SGreg Kroah-Hartman 485ab4382d2SGreg Kroah-Hartman static int uart_put_char(struct tty_struct *tty, unsigned char ch) 486ab4382d2SGreg Kroah-Hartman { 487ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 488ab4382d2SGreg Kroah-Hartman 489ab4382d2SGreg Kroah-Hartman return __uart_put_char(state->uart_port, &state->xmit, ch); 490ab4382d2SGreg Kroah-Hartman } 491ab4382d2SGreg Kroah-Hartman 492ab4382d2SGreg Kroah-Hartman static void uart_flush_chars(struct tty_struct *tty) 493ab4382d2SGreg Kroah-Hartman { 494ab4382d2SGreg Kroah-Hartman uart_start(tty); 495ab4382d2SGreg Kroah-Hartman } 496ab4382d2SGreg Kroah-Hartman 497ab4382d2SGreg Kroah-Hartman static int uart_write(struct tty_struct *tty, 498ab4382d2SGreg Kroah-Hartman const unsigned char *buf, int count) 499ab4382d2SGreg Kroah-Hartman { 500ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 501ab4382d2SGreg Kroah-Hartman struct uart_port *port; 502ab4382d2SGreg Kroah-Hartman struct circ_buf *circ; 503ab4382d2SGreg Kroah-Hartman unsigned long flags; 504ab4382d2SGreg Kroah-Hartman int c, ret = 0; 505ab4382d2SGreg Kroah-Hartman 506ab4382d2SGreg Kroah-Hartman /* 507ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 508ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 509ab4382d2SGreg Kroah-Hartman */ 510ab4382d2SGreg Kroah-Hartman if (!state) { 511ab4382d2SGreg Kroah-Hartman WARN_ON(1); 512ab4382d2SGreg Kroah-Hartman return -EL3HLT; 513ab4382d2SGreg Kroah-Hartman } 514ab4382d2SGreg Kroah-Hartman 515ab4382d2SGreg Kroah-Hartman port = state->uart_port; 516ab4382d2SGreg Kroah-Hartman circ = &state->xmit; 517ab4382d2SGreg Kroah-Hartman 518ab4382d2SGreg Kroah-Hartman if (!circ->buf) 519ab4382d2SGreg Kroah-Hartman return 0; 520ab4382d2SGreg Kroah-Hartman 521ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 522ab4382d2SGreg Kroah-Hartman while (1) { 523ab4382d2SGreg Kroah-Hartman c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE); 524ab4382d2SGreg Kroah-Hartman if (count < c) 525ab4382d2SGreg Kroah-Hartman c = count; 526ab4382d2SGreg Kroah-Hartman if (c <= 0) 527ab4382d2SGreg Kroah-Hartman break; 528ab4382d2SGreg Kroah-Hartman memcpy(circ->buf + circ->head, buf, c); 529ab4382d2SGreg Kroah-Hartman circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1); 530ab4382d2SGreg Kroah-Hartman buf += c; 531ab4382d2SGreg Kroah-Hartman count -= c; 532ab4382d2SGreg Kroah-Hartman ret += c; 533ab4382d2SGreg Kroah-Hartman } 534ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 535ab4382d2SGreg Kroah-Hartman 536ab4382d2SGreg Kroah-Hartman uart_start(tty); 537ab4382d2SGreg Kroah-Hartman return ret; 538ab4382d2SGreg Kroah-Hartman } 539ab4382d2SGreg Kroah-Hartman 540ab4382d2SGreg Kroah-Hartman static int uart_write_room(struct tty_struct *tty) 541ab4382d2SGreg Kroah-Hartman { 542ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 543ab4382d2SGreg Kroah-Hartman unsigned long flags; 544ab4382d2SGreg Kroah-Hartman int ret; 545ab4382d2SGreg Kroah-Hartman 546ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&state->uart_port->lock, flags); 547ab4382d2SGreg Kroah-Hartman ret = uart_circ_chars_free(&state->xmit); 548ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&state->uart_port->lock, flags); 549ab4382d2SGreg Kroah-Hartman return ret; 550ab4382d2SGreg Kroah-Hartman } 551ab4382d2SGreg Kroah-Hartman 552ab4382d2SGreg Kroah-Hartman static int uart_chars_in_buffer(struct tty_struct *tty) 553ab4382d2SGreg Kroah-Hartman { 554ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 555ab4382d2SGreg Kroah-Hartman unsigned long flags; 556ab4382d2SGreg Kroah-Hartman int ret; 557ab4382d2SGreg Kroah-Hartman 558ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&state->uart_port->lock, flags); 559ab4382d2SGreg Kroah-Hartman ret = uart_circ_chars_pending(&state->xmit); 560ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&state->uart_port->lock, flags); 561ab4382d2SGreg Kroah-Hartman return ret; 562ab4382d2SGreg Kroah-Hartman } 563ab4382d2SGreg Kroah-Hartman 564ab4382d2SGreg Kroah-Hartman static void uart_flush_buffer(struct tty_struct *tty) 565ab4382d2SGreg Kroah-Hartman { 566ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 567ab4382d2SGreg Kroah-Hartman struct uart_port *port; 568ab4382d2SGreg Kroah-Hartman unsigned long flags; 569ab4382d2SGreg Kroah-Hartman 570ab4382d2SGreg Kroah-Hartman /* 571ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 572ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 573ab4382d2SGreg Kroah-Hartman */ 574ab4382d2SGreg Kroah-Hartman if (!state) { 575ab4382d2SGreg Kroah-Hartman WARN_ON(1); 576ab4382d2SGreg Kroah-Hartman return; 577ab4382d2SGreg Kroah-Hartman } 578ab4382d2SGreg Kroah-Hartman 579ab4382d2SGreg Kroah-Hartman port = state->uart_port; 580ab4382d2SGreg Kroah-Hartman pr_debug("uart_flush_buffer(%d) called\n", tty->index); 581ab4382d2SGreg Kroah-Hartman 582ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 583ab4382d2SGreg Kroah-Hartman uart_circ_clear(&state->xmit); 584ab4382d2SGreg Kroah-Hartman if (port->ops->flush_buffer) 585ab4382d2SGreg Kroah-Hartman port->ops->flush_buffer(port); 586ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 587ab4382d2SGreg Kroah-Hartman tty_wakeup(tty); 588ab4382d2SGreg Kroah-Hartman } 589ab4382d2SGreg Kroah-Hartman 590ab4382d2SGreg Kroah-Hartman /* 591ab4382d2SGreg Kroah-Hartman * This function is used to send a high-priority XON/XOFF character to 592ab4382d2SGreg Kroah-Hartman * the device 593ab4382d2SGreg Kroah-Hartman */ 594ab4382d2SGreg Kroah-Hartman static void uart_send_xchar(struct tty_struct *tty, char ch) 595ab4382d2SGreg Kroah-Hartman { 596ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 597ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 598ab4382d2SGreg Kroah-Hartman unsigned long flags; 599ab4382d2SGreg Kroah-Hartman 600ab4382d2SGreg Kroah-Hartman if (port->ops->send_xchar) 601ab4382d2SGreg Kroah-Hartman port->ops->send_xchar(port, ch); 602ab4382d2SGreg Kroah-Hartman else { 603ab4382d2SGreg Kroah-Hartman port->x_char = ch; 604ab4382d2SGreg Kroah-Hartman if (ch) { 605ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 606ab4382d2SGreg Kroah-Hartman port->ops->start_tx(port); 607ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 608ab4382d2SGreg Kroah-Hartman } 609ab4382d2SGreg Kroah-Hartman } 610ab4382d2SGreg Kroah-Hartman } 611ab4382d2SGreg Kroah-Hartman 612ab4382d2SGreg Kroah-Hartman static void uart_throttle(struct tty_struct *tty) 613ab4382d2SGreg Kroah-Hartman { 614ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 6159aba8d5bSRussell King struct uart_port *port = state->uart_port; 6169aba8d5bSRussell King uint32_t mask = 0; 617ab4382d2SGreg Kroah-Hartman 618ab4382d2SGreg Kroah-Hartman if (I_IXOFF(tty)) 6199aba8d5bSRussell King mask |= UPF_SOFT_FLOW; 6209aba8d5bSRussell King if (tty->termios.c_cflag & CRTSCTS) 6219aba8d5bSRussell King mask |= UPF_HARD_FLOW; 6229aba8d5bSRussell King 6239aba8d5bSRussell King if (port->flags & mask) { 6249aba8d5bSRussell King port->ops->throttle(port); 6259aba8d5bSRussell King mask &= ~port->flags; 6269aba8d5bSRussell King } 6279aba8d5bSRussell King 6289aba8d5bSRussell King if (mask & UPF_SOFT_FLOW) 629ab4382d2SGreg Kroah-Hartman uart_send_xchar(tty, STOP_CHAR(tty)); 630ab4382d2SGreg Kroah-Hartman 6319aba8d5bSRussell King if (mask & UPF_HARD_FLOW) 6329aba8d5bSRussell King uart_clear_mctrl(port, TIOCM_RTS); 633ab4382d2SGreg Kroah-Hartman } 634ab4382d2SGreg Kroah-Hartman 635ab4382d2SGreg Kroah-Hartman static void uart_unthrottle(struct tty_struct *tty) 636ab4382d2SGreg Kroah-Hartman { 637ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 638ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 6399aba8d5bSRussell King uint32_t mask = 0; 640ab4382d2SGreg Kroah-Hartman 6419aba8d5bSRussell King if (I_IXOFF(tty)) 6429aba8d5bSRussell King mask |= UPF_SOFT_FLOW; 6439aba8d5bSRussell King if (tty->termios.c_cflag & CRTSCTS) 6449aba8d5bSRussell King mask |= UPF_HARD_FLOW; 6459aba8d5bSRussell King 6469aba8d5bSRussell King if (port->flags & mask) { 6479aba8d5bSRussell King port->ops->unthrottle(port); 6489aba8d5bSRussell King mask &= ~port->flags; 6499aba8d5bSRussell King } 6509aba8d5bSRussell King 6519aba8d5bSRussell King if (mask & UPF_SOFT_FLOW) { 652ab4382d2SGreg Kroah-Hartman if (port->x_char) 653ab4382d2SGreg Kroah-Hartman port->x_char = 0; 654ab4382d2SGreg Kroah-Hartman else 655ab4382d2SGreg Kroah-Hartman uart_send_xchar(tty, START_CHAR(tty)); 656ab4382d2SGreg Kroah-Hartman } 657ab4382d2SGreg Kroah-Hartman 6589aba8d5bSRussell King if (mask & UPF_HARD_FLOW) 659ab4382d2SGreg Kroah-Hartman uart_set_mctrl(port, TIOCM_RTS); 660ab4382d2SGreg Kroah-Hartman } 661ab4382d2SGreg Kroah-Hartman 6629f109694SAlan Cox static void do_uart_get_info(struct tty_port *port, 6637ba2e769SAlan Cox struct serial_struct *retinfo) 664ab4382d2SGreg Kroah-Hartman { 6659f109694SAlan Cox struct uart_state *state = container_of(port, struct uart_state, port); 666ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 6677ba2e769SAlan Cox 66837cd0c99SFengguang Wu memset(retinfo, 0, sizeof(*retinfo)); 6697ba2e769SAlan Cox 6707ba2e769SAlan Cox retinfo->type = uport->type; 6717ba2e769SAlan Cox retinfo->line = uport->line; 6727ba2e769SAlan Cox retinfo->port = uport->iobase; 6737ba2e769SAlan Cox if (HIGH_BITS_OFFSET) 6747ba2e769SAlan Cox retinfo->port_high = (long) uport->iobase >> HIGH_BITS_OFFSET; 6757ba2e769SAlan Cox retinfo->irq = uport->irq; 6767ba2e769SAlan Cox retinfo->flags = uport->flags; 6777ba2e769SAlan Cox retinfo->xmit_fifo_size = uport->fifosize; 6787ba2e769SAlan Cox retinfo->baud_base = uport->uartclk / 16; 6797ba2e769SAlan Cox retinfo->close_delay = jiffies_to_msecs(port->close_delay) / 10; 6807ba2e769SAlan Cox retinfo->closing_wait = port->closing_wait == ASYNC_CLOSING_WAIT_NONE ? 6817ba2e769SAlan Cox ASYNC_CLOSING_WAIT_NONE : 6827ba2e769SAlan Cox jiffies_to_msecs(port->closing_wait) / 10; 6837ba2e769SAlan Cox retinfo->custom_divisor = uport->custom_divisor; 6847ba2e769SAlan Cox retinfo->hub6 = uport->hub6; 6857ba2e769SAlan Cox retinfo->io_type = uport->iotype; 6867ba2e769SAlan Cox retinfo->iomem_reg_shift = uport->regshift; 6877ba2e769SAlan Cox retinfo->iomem_base = (void *)(unsigned long)uport->mapbase; 6887ba2e769SAlan Cox } 6897ba2e769SAlan Cox 6909f109694SAlan Cox static void uart_get_info(struct tty_port *port, 6919f109694SAlan Cox struct serial_struct *retinfo) 6927ba2e769SAlan Cox { 693ab4382d2SGreg Kroah-Hartman /* Ensure the state we copy is consistent and no hardware changes 694ab4382d2SGreg Kroah-Hartman occur as we go */ 695ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 6969f109694SAlan Cox do_uart_get_info(port, retinfo); 697ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 6989f109694SAlan Cox } 6999f109694SAlan Cox 7009f109694SAlan Cox static int uart_get_info_user(struct tty_port *port, 7019f109694SAlan Cox struct serial_struct __user *retinfo) 7029f109694SAlan Cox { 7039f109694SAlan Cox struct serial_struct tmp; 7049f109694SAlan Cox uart_get_info(port, &tmp); 705ab4382d2SGreg Kroah-Hartman 706ab4382d2SGreg Kroah-Hartman if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) 707ab4382d2SGreg Kroah-Hartman return -EFAULT; 708ab4382d2SGreg Kroah-Hartman return 0; 709ab4382d2SGreg Kroah-Hartman } 710ab4382d2SGreg Kroah-Hartman 7117ba2e769SAlan Cox static int uart_set_info(struct tty_struct *tty, struct tty_port *port, 7127ba2e769SAlan Cox struct uart_state *state, 7137ba2e769SAlan Cox struct serial_struct *new_info) 714ab4382d2SGreg Kroah-Hartman { 715ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 716ab4382d2SGreg Kroah-Hartman unsigned long new_port; 717ab4382d2SGreg Kroah-Hartman unsigned int change_irq, change_port, closing_wait; 718ab4382d2SGreg Kroah-Hartman unsigned int old_custom_divisor, close_delay; 719ab4382d2SGreg Kroah-Hartman upf_t old_flags, new_flags; 720ab4382d2SGreg Kroah-Hartman int retval = 0; 721ab4382d2SGreg Kroah-Hartman 7227ba2e769SAlan Cox new_port = new_info->port; 723ab4382d2SGreg Kroah-Hartman if (HIGH_BITS_OFFSET) 7247ba2e769SAlan Cox new_port += (unsigned long) new_info->port_high << HIGH_BITS_OFFSET; 725ab4382d2SGreg Kroah-Hartman 7267ba2e769SAlan Cox new_info->irq = irq_canonicalize(new_info->irq); 7277ba2e769SAlan Cox close_delay = msecs_to_jiffies(new_info->close_delay * 10); 7287ba2e769SAlan Cox closing_wait = new_info->closing_wait == ASYNC_CLOSING_WAIT_NONE ? 7294cb0fbfdSJiri Slaby ASYNC_CLOSING_WAIT_NONE : 7307ba2e769SAlan Cox msecs_to_jiffies(new_info->closing_wait * 10); 731ab4382d2SGreg Kroah-Hartman 732ab4382d2SGreg Kroah-Hartman 733ab4382d2SGreg Kroah-Hartman change_irq = !(uport->flags & UPF_FIXED_PORT) 7347ba2e769SAlan Cox && new_info->irq != uport->irq; 735ab4382d2SGreg Kroah-Hartman 736ab4382d2SGreg Kroah-Hartman /* 737ab4382d2SGreg Kroah-Hartman * Since changing the 'type' of the port changes its resource 738ab4382d2SGreg Kroah-Hartman * allocations, we should treat type changes the same as 739ab4382d2SGreg Kroah-Hartman * IO port changes. 740ab4382d2SGreg Kroah-Hartman */ 741ab4382d2SGreg Kroah-Hartman change_port = !(uport->flags & UPF_FIXED_PORT) 742ab4382d2SGreg Kroah-Hartman && (new_port != uport->iobase || 7437ba2e769SAlan Cox (unsigned long)new_info->iomem_base != uport->mapbase || 7447ba2e769SAlan Cox new_info->hub6 != uport->hub6 || 7457ba2e769SAlan Cox new_info->io_type != uport->iotype || 7467ba2e769SAlan Cox new_info->iomem_reg_shift != uport->regshift || 7477ba2e769SAlan Cox new_info->type != uport->type); 748ab4382d2SGreg Kroah-Hartman 749ab4382d2SGreg Kroah-Hartman old_flags = uport->flags; 7507ba2e769SAlan Cox new_flags = new_info->flags; 751ab4382d2SGreg Kroah-Hartman old_custom_divisor = uport->custom_divisor; 752ab4382d2SGreg Kroah-Hartman 753ab4382d2SGreg Kroah-Hartman if (!capable(CAP_SYS_ADMIN)) { 754ab4382d2SGreg Kroah-Hartman retval = -EPERM; 755ab4382d2SGreg Kroah-Hartman if (change_irq || change_port || 7567ba2e769SAlan Cox (new_info->baud_base != uport->uartclk / 16) || 757ab4382d2SGreg Kroah-Hartman (close_delay != port->close_delay) || 758ab4382d2SGreg Kroah-Hartman (closing_wait != port->closing_wait) || 7597ba2e769SAlan Cox (new_info->xmit_fifo_size && 7607ba2e769SAlan Cox new_info->xmit_fifo_size != uport->fifosize) || 761ab4382d2SGreg Kroah-Hartman (((new_flags ^ old_flags) & ~UPF_USR_MASK) != 0)) 762ab4382d2SGreg Kroah-Hartman goto exit; 763ab4382d2SGreg Kroah-Hartman uport->flags = ((uport->flags & ~UPF_USR_MASK) | 764ab4382d2SGreg Kroah-Hartman (new_flags & UPF_USR_MASK)); 7657ba2e769SAlan Cox uport->custom_divisor = new_info->custom_divisor; 766ab4382d2SGreg Kroah-Hartman goto check_and_exit; 767ab4382d2SGreg Kroah-Hartman } 768ab4382d2SGreg Kroah-Hartman 769ab4382d2SGreg Kroah-Hartman /* 770ab4382d2SGreg Kroah-Hartman * Ask the low level driver to verify the settings. 771ab4382d2SGreg Kroah-Hartman */ 772ab4382d2SGreg Kroah-Hartman if (uport->ops->verify_port) 7737ba2e769SAlan Cox retval = uport->ops->verify_port(uport, new_info); 774ab4382d2SGreg Kroah-Hartman 7757ba2e769SAlan Cox if ((new_info->irq >= nr_irqs) || (new_info->irq < 0) || 7767ba2e769SAlan Cox (new_info->baud_base < 9600)) 777ab4382d2SGreg Kroah-Hartman retval = -EINVAL; 778ab4382d2SGreg Kroah-Hartman 779ab4382d2SGreg Kroah-Hartman if (retval) 780ab4382d2SGreg Kroah-Hartman goto exit; 781ab4382d2SGreg Kroah-Hartman 782ab4382d2SGreg Kroah-Hartman if (change_port || change_irq) { 783ab4382d2SGreg Kroah-Hartman retval = -EBUSY; 784ab4382d2SGreg Kroah-Hartman 785ab4382d2SGreg Kroah-Hartman /* 786ab4382d2SGreg Kroah-Hartman * Make sure that we are the sole user of this port. 787ab4382d2SGreg Kroah-Hartman */ 788ab4382d2SGreg Kroah-Hartman if (tty_port_users(port) > 1) 789ab4382d2SGreg Kroah-Hartman goto exit; 790ab4382d2SGreg Kroah-Hartman 791ab4382d2SGreg Kroah-Hartman /* 792ab4382d2SGreg Kroah-Hartman * We need to shutdown the serial port at the old 793ab4382d2SGreg Kroah-Hartman * port/type/irq combination. 794ab4382d2SGreg Kroah-Hartman */ 795ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 796ab4382d2SGreg Kroah-Hartman } 797ab4382d2SGreg Kroah-Hartman 798ab4382d2SGreg Kroah-Hartman if (change_port) { 799ab4382d2SGreg Kroah-Hartman unsigned long old_iobase, old_mapbase; 800ab4382d2SGreg Kroah-Hartman unsigned int old_type, old_iotype, old_hub6, old_shift; 801ab4382d2SGreg Kroah-Hartman 802ab4382d2SGreg Kroah-Hartman old_iobase = uport->iobase; 803ab4382d2SGreg Kroah-Hartman old_mapbase = uport->mapbase; 804ab4382d2SGreg Kroah-Hartman old_type = uport->type; 805ab4382d2SGreg Kroah-Hartman old_hub6 = uport->hub6; 806ab4382d2SGreg Kroah-Hartman old_iotype = uport->iotype; 807ab4382d2SGreg Kroah-Hartman old_shift = uport->regshift; 808ab4382d2SGreg Kroah-Hartman 809ab4382d2SGreg Kroah-Hartman /* 810ab4382d2SGreg Kroah-Hartman * Free and release old regions 811ab4382d2SGreg Kroah-Hartman */ 812ab4382d2SGreg Kroah-Hartman if (old_type != PORT_UNKNOWN) 813ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 814ab4382d2SGreg Kroah-Hartman 815ab4382d2SGreg Kroah-Hartman uport->iobase = new_port; 8167ba2e769SAlan Cox uport->type = new_info->type; 8177ba2e769SAlan Cox uport->hub6 = new_info->hub6; 8187ba2e769SAlan Cox uport->iotype = new_info->io_type; 8197ba2e769SAlan Cox uport->regshift = new_info->iomem_reg_shift; 8207ba2e769SAlan Cox uport->mapbase = (unsigned long)new_info->iomem_base; 821ab4382d2SGreg Kroah-Hartman 822ab4382d2SGreg Kroah-Hartman /* 823ab4382d2SGreg Kroah-Hartman * Claim and map the new regions 824ab4382d2SGreg Kroah-Hartman */ 825ab4382d2SGreg Kroah-Hartman if (uport->type != PORT_UNKNOWN) { 826ab4382d2SGreg Kroah-Hartman retval = uport->ops->request_port(uport); 827ab4382d2SGreg Kroah-Hartman } else { 828ab4382d2SGreg Kroah-Hartman /* Always success - Jean II */ 829ab4382d2SGreg Kroah-Hartman retval = 0; 830ab4382d2SGreg Kroah-Hartman } 831ab4382d2SGreg Kroah-Hartman 832ab4382d2SGreg Kroah-Hartman /* 833ab4382d2SGreg Kroah-Hartman * If we fail to request resources for the 834ab4382d2SGreg Kroah-Hartman * new port, try to restore the old settings. 835ab4382d2SGreg Kroah-Hartman */ 8367deb39edSThomas Pfaff if (retval) { 837ab4382d2SGreg Kroah-Hartman uport->iobase = old_iobase; 838ab4382d2SGreg Kroah-Hartman uport->type = old_type; 839ab4382d2SGreg Kroah-Hartman uport->hub6 = old_hub6; 840ab4382d2SGreg Kroah-Hartman uport->iotype = old_iotype; 841ab4382d2SGreg Kroah-Hartman uport->regshift = old_shift; 842ab4382d2SGreg Kroah-Hartman uport->mapbase = old_mapbase; 8437deb39edSThomas Pfaff 8447deb39edSThomas Pfaff if (old_type != PORT_UNKNOWN) { 845ab4382d2SGreg Kroah-Hartman retval = uport->ops->request_port(uport); 846ab4382d2SGreg Kroah-Hartman /* 847ab4382d2SGreg Kroah-Hartman * If we failed to restore the old settings, 848ab4382d2SGreg Kroah-Hartman * we fail like this. 849ab4382d2SGreg Kroah-Hartman */ 850ab4382d2SGreg Kroah-Hartman if (retval) 851ab4382d2SGreg Kroah-Hartman uport->type = PORT_UNKNOWN; 852ab4382d2SGreg Kroah-Hartman 853ab4382d2SGreg Kroah-Hartman /* 854ab4382d2SGreg Kroah-Hartman * We failed anyway. 855ab4382d2SGreg Kroah-Hartman */ 856ab4382d2SGreg Kroah-Hartman retval = -EBUSY; 8577deb39edSThomas Pfaff } 8587deb39edSThomas Pfaff 859ab4382d2SGreg Kroah-Hartman /* Added to return the correct error -Ram Gupta */ 860ab4382d2SGreg Kroah-Hartman goto exit; 861ab4382d2SGreg Kroah-Hartman } 862ab4382d2SGreg Kroah-Hartman } 863ab4382d2SGreg Kroah-Hartman 864ab4382d2SGreg Kroah-Hartman if (change_irq) 8657ba2e769SAlan Cox uport->irq = new_info->irq; 866ab4382d2SGreg Kroah-Hartman if (!(uport->flags & UPF_FIXED_PORT)) 8677ba2e769SAlan Cox uport->uartclk = new_info->baud_base * 16; 868ab4382d2SGreg Kroah-Hartman uport->flags = (uport->flags & ~UPF_CHANGE_MASK) | 869ab4382d2SGreg Kroah-Hartman (new_flags & UPF_CHANGE_MASK); 8707ba2e769SAlan Cox uport->custom_divisor = new_info->custom_divisor; 871ab4382d2SGreg Kroah-Hartman port->close_delay = close_delay; 872ab4382d2SGreg Kroah-Hartman port->closing_wait = closing_wait; 8737ba2e769SAlan Cox if (new_info->xmit_fifo_size) 8747ba2e769SAlan Cox uport->fifosize = new_info->xmit_fifo_size; 875d6c53c0eSJiri Slaby port->low_latency = (uport->flags & UPF_LOW_LATENCY) ? 1 : 0; 876ab4382d2SGreg Kroah-Hartman 877ab4382d2SGreg Kroah-Hartman check_and_exit: 878ab4382d2SGreg Kroah-Hartman retval = 0; 879ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) 880ab4382d2SGreg Kroah-Hartman goto exit; 881ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_INITIALIZED) { 882ab4382d2SGreg Kroah-Hartman if (((old_flags ^ uport->flags) & UPF_SPD_MASK) || 883ab4382d2SGreg Kroah-Hartman old_custom_divisor != uport->custom_divisor) { 884ab4382d2SGreg Kroah-Hartman /* 885ab4382d2SGreg Kroah-Hartman * If they're setting up a custom divisor or speed, 886ab4382d2SGreg Kroah-Hartman * instead of clearing it, then bitch about it. No 887ab4382d2SGreg Kroah-Hartman * need to rate-limit; it's CAP_SYS_ADMIN only. 888ab4382d2SGreg Kroah-Hartman */ 889ab4382d2SGreg Kroah-Hartman if (uport->flags & UPF_SPD_MASK) { 890ab4382d2SGreg Kroah-Hartman char buf[64]; 8912f2dafe7SSudip Mukherjee 8922f2dafe7SSudip Mukherjee dev_notice(uport->dev, 8932f2dafe7SSudip Mukherjee "%s sets custom speed on %s. This is deprecated.\n", 8942f2dafe7SSudip Mukherjee current->comm, 895ab4382d2SGreg Kroah-Hartman tty_name(port->tty, buf)); 896ab4382d2SGreg Kroah-Hartman } 897ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 898ab4382d2SGreg Kroah-Hartman } 899ab4382d2SGreg Kroah-Hartman } else 900ab4382d2SGreg Kroah-Hartman retval = uart_startup(tty, state, 1); 901ab4382d2SGreg Kroah-Hartman exit: 9027ba2e769SAlan Cox return retval; 9037ba2e769SAlan Cox } 9047ba2e769SAlan Cox 9057ba2e769SAlan Cox static int uart_set_info_user(struct tty_struct *tty, struct uart_state *state, 9067ba2e769SAlan Cox struct serial_struct __user *newinfo) 9077ba2e769SAlan Cox { 9087ba2e769SAlan Cox struct serial_struct new_serial; 9097ba2e769SAlan Cox struct tty_port *port = &state->port; 9107ba2e769SAlan Cox int retval; 9117ba2e769SAlan Cox 9127ba2e769SAlan Cox if (copy_from_user(&new_serial, newinfo, sizeof(new_serial))) 9137ba2e769SAlan Cox return -EFAULT; 9147ba2e769SAlan Cox 9157ba2e769SAlan Cox /* 9167ba2e769SAlan Cox * This semaphore protects port->count. It is also 9177ba2e769SAlan Cox * very useful to prevent opens. Also, take the 9187ba2e769SAlan Cox * port configuration semaphore to make sure that a 9197ba2e769SAlan Cox * module insertion/removal doesn't change anything 9207ba2e769SAlan Cox * under us. 9217ba2e769SAlan Cox */ 9227ba2e769SAlan Cox mutex_lock(&port->mutex); 9237ba2e769SAlan Cox retval = uart_set_info(tty, port, state, &new_serial); 924ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 925ab4382d2SGreg Kroah-Hartman return retval; 926ab4382d2SGreg Kroah-Hartman } 927ab4382d2SGreg Kroah-Hartman 928ab4382d2SGreg Kroah-Hartman /** 929ab4382d2SGreg Kroah-Hartman * uart_get_lsr_info - get line status register info 930ab4382d2SGreg Kroah-Hartman * @tty: tty associated with the UART 931ab4382d2SGreg Kroah-Hartman * @state: UART being queried 932ab4382d2SGreg Kroah-Hartman * @value: returned modem value 933ab4382d2SGreg Kroah-Hartman * 934ab4382d2SGreg Kroah-Hartman * Note: uart_ioctl protects us against hangups. 935ab4382d2SGreg Kroah-Hartman */ 936ab4382d2SGreg Kroah-Hartman static int uart_get_lsr_info(struct tty_struct *tty, 937ab4382d2SGreg Kroah-Hartman struct uart_state *state, unsigned int __user *value) 938ab4382d2SGreg Kroah-Hartman { 939ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 940ab4382d2SGreg Kroah-Hartman unsigned int result; 941ab4382d2SGreg Kroah-Hartman 942ab4382d2SGreg Kroah-Hartman result = uport->ops->tx_empty(uport); 943ab4382d2SGreg Kroah-Hartman 944ab4382d2SGreg Kroah-Hartman /* 945ab4382d2SGreg Kroah-Hartman * If we're about to load something into the transmit 946ab4382d2SGreg Kroah-Hartman * register, we'll pretend the transmitter isn't empty to 947ab4382d2SGreg Kroah-Hartman * avoid a race condition (depending on when the transmit 948ab4382d2SGreg Kroah-Hartman * interrupt happens). 949ab4382d2SGreg Kroah-Hartman */ 950ab4382d2SGreg Kroah-Hartman if (uport->x_char || 951ab4382d2SGreg Kroah-Hartman ((uart_circ_chars_pending(&state->xmit) > 0) && 952ab4382d2SGreg Kroah-Hartman !tty->stopped && !tty->hw_stopped)) 953ab4382d2SGreg Kroah-Hartman result &= ~TIOCSER_TEMT; 954ab4382d2SGreg Kroah-Hartman 955ab4382d2SGreg Kroah-Hartman return put_user(result, value); 956ab4382d2SGreg Kroah-Hartman } 957ab4382d2SGreg Kroah-Hartman 95860b33c13SAlan Cox static int uart_tiocmget(struct tty_struct *tty) 959ab4382d2SGreg Kroah-Hartman { 960ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 961ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 962ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 963ab4382d2SGreg Kroah-Hartman int result = -EIO; 964ab4382d2SGreg Kroah-Hartman 965ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 96660b33c13SAlan Cox if (!(tty->flags & (1 << TTY_IO_ERROR))) { 967ab4382d2SGreg Kroah-Hartman result = uport->mctrl; 968ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 969ab4382d2SGreg Kroah-Hartman result |= uport->ops->get_mctrl(uport); 970ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 971ab4382d2SGreg Kroah-Hartman } 972ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 973ab4382d2SGreg Kroah-Hartman 974ab4382d2SGreg Kroah-Hartman return result; 975ab4382d2SGreg Kroah-Hartman } 976ab4382d2SGreg Kroah-Hartman 977ab4382d2SGreg Kroah-Hartman static int 97820b9d177SAlan Cox uart_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear) 979ab4382d2SGreg Kroah-Hartman { 980ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 981ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 982ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 983ab4382d2SGreg Kroah-Hartman int ret = -EIO; 984ab4382d2SGreg Kroah-Hartman 985ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 98620b9d177SAlan Cox if (!(tty->flags & (1 << TTY_IO_ERROR))) { 987ab4382d2SGreg Kroah-Hartman uart_update_mctrl(uport, set, clear); 988ab4382d2SGreg Kroah-Hartman ret = 0; 989ab4382d2SGreg Kroah-Hartman } 990ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 991ab4382d2SGreg Kroah-Hartman return ret; 992ab4382d2SGreg Kroah-Hartman } 993ab4382d2SGreg Kroah-Hartman 994ab4382d2SGreg Kroah-Hartman static int uart_break_ctl(struct tty_struct *tty, int break_state) 995ab4382d2SGreg Kroah-Hartman { 996ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 997ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 998ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 999ab4382d2SGreg Kroah-Hartman 1000ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1001ab4382d2SGreg Kroah-Hartman 1002ab4382d2SGreg Kroah-Hartman if (uport->type != PORT_UNKNOWN) 1003ab4382d2SGreg Kroah-Hartman uport->ops->break_ctl(uport, break_state); 1004ab4382d2SGreg Kroah-Hartman 1005ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1006ab4382d2SGreg Kroah-Hartman return 0; 1007ab4382d2SGreg Kroah-Hartman } 1008ab4382d2SGreg Kroah-Hartman 1009ab4382d2SGreg Kroah-Hartman static int uart_do_autoconfig(struct tty_struct *tty,struct uart_state *state) 1010ab4382d2SGreg Kroah-Hartman { 1011ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1012ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1013ab4382d2SGreg Kroah-Hartman int flags, ret; 1014ab4382d2SGreg Kroah-Hartman 1015ab4382d2SGreg Kroah-Hartman if (!capable(CAP_SYS_ADMIN)) 1016ab4382d2SGreg Kroah-Hartman return -EPERM; 1017ab4382d2SGreg Kroah-Hartman 1018ab4382d2SGreg Kroah-Hartman /* 1019ab4382d2SGreg Kroah-Hartman * Take the per-port semaphore. This prevents count from 1020ab4382d2SGreg Kroah-Hartman * changing, and hence any extra opens of the port while 1021ab4382d2SGreg Kroah-Hartman * we're auto-configuring. 1022ab4382d2SGreg Kroah-Hartman */ 1023ab4382d2SGreg Kroah-Hartman if (mutex_lock_interruptible(&port->mutex)) 1024ab4382d2SGreg Kroah-Hartman return -ERESTARTSYS; 1025ab4382d2SGreg Kroah-Hartman 1026ab4382d2SGreg Kroah-Hartman ret = -EBUSY; 1027ab4382d2SGreg Kroah-Hartman if (tty_port_users(port) == 1) { 1028ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 1029ab4382d2SGreg Kroah-Hartman 1030ab4382d2SGreg Kroah-Hartman /* 1031ab4382d2SGreg Kroah-Hartman * If we already have a port type configured, 1032ab4382d2SGreg Kroah-Hartman * we must release its resources. 1033ab4382d2SGreg Kroah-Hartman */ 1034ab4382d2SGreg Kroah-Hartman if (uport->type != PORT_UNKNOWN) 1035ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 1036ab4382d2SGreg Kroah-Hartman 1037ab4382d2SGreg Kroah-Hartman flags = UART_CONFIG_TYPE; 1038ab4382d2SGreg Kroah-Hartman if (uport->flags & UPF_AUTO_IRQ) 1039ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_IRQ; 1040ab4382d2SGreg Kroah-Hartman 1041ab4382d2SGreg Kroah-Hartman /* 1042ab4382d2SGreg Kroah-Hartman * This will claim the ports resources if 1043ab4382d2SGreg Kroah-Hartman * a port is found. 1044ab4382d2SGreg Kroah-Hartman */ 1045ab4382d2SGreg Kroah-Hartman uport->ops->config_port(uport, flags); 1046ab4382d2SGreg Kroah-Hartman 1047ab4382d2SGreg Kroah-Hartman ret = uart_startup(tty, state, 1); 1048ab4382d2SGreg Kroah-Hartman } 1049ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1050ab4382d2SGreg Kroah-Hartman return ret; 1051ab4382d2SGreg Kroah-Hartman } 1052ab4382d2SGreg Kroah-Hartman 10531fdc3106SAlexander Shiyan static void uart_enable_ms(struct uart_port *uport) 10541fdc3106SAlexander Shiyan { 10551fdc3106SAlexander Shiyan /* 10561fdc3106SAlexander Shiyan * Force modem status interrupts on 10571fdc3106SAlexander Shiyan */ 10581fdc3106SAlexander Shiyan if (uport->ops->enable_ms) 10591fdc3106SAlexander Shiyan uport->ops->enable_ms(uport); 10601fdc3106SAlexander Shiyan } 10611fdc3106SAlexander Shiyan 1062ab4382d2SGreg Kroah-Hartman /* 1063ab4382d2SGreg Kroah-Hartman * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change 1064ab4382d2SGreg Kroah-Hartman * - mask passed in arg for lines of interest 1065ab4382d2SGreg Kroah-Hartman * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) 1066ab4382d2SGreg Kroah-Hartman * Caller should use TIOCGICOUNT to see which one it was 1067ab4382d2SGreg Kroah-Hartman * 1068ab4382d2SGreg Kroah-Hartman * FIXME: This wants extracting into a common all driver implementation 1069ab4382d2SGreg Kroah-Hartman * of TIOCMWAIT using tty_port. 1070ab4382d2SGreg Kroah-Hartman */ 1071ab4382d2SGreg Kroah-Hartman static int 1072ab4382d2SGreg Kroah-Hartman uart_wait_modem_status(struct uart_state *state, unsigned long arg) 1073ab4382d2SGreg Kroah-Hartman { 1074ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1075ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1076ab4382d2SGreg Kroah-Hartman DECLARE_WAITQUEUE(wait, current); 1077ab4382d2SGreg Kroah-Hartman struct uart_icount cprev, cnow; 1078ab4382d2SGreg Kroah-Hartman int ret; 1079ab4382d2SGreg Kroah-Hartman 1080ab4382d2SGreg Kroah-Hartman /* 1081ab4382d2SGreg Kroah-Hartman * note the counters on entry 1082ab4382d2SGreg Kroah-Hartman */ 1083ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1084ab4382d2SGreg Kroah-Hartman memcpy(&cprev, &uport->icount, sizeof(struct uart_icount)); 10851fdc3106SAlexander Shiyan uart_enable_ms(uport); 1086ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1087ab4382d2SGreg Kroah-Hartman 1088ab4382d2SGreg Kroah-Hartman add_wait_queue(&port->delta_msr_wait, &wait); 1089ab4382d2SGreg Kroah-Hartman for (;;) { 1090ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1091ab4382d2SGreg Kroah-Hartman memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); 1092ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1093ab4382d2SGreg Kroah-Hartman 1094ab4382d2SGreg Kroah-Hartman set_current_state(TASK_INTERRUPTIBLE); 1095ab4382d2SGreg Kroah-Hartman 1096ab4382d2SGreg Kroah-Hartman if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || 1097ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || 1098ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || 1099ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) { 1100ab4382d2SGreg Kroah-Hartman ret = 0; 1101ab4382d2SGreg Kroah-Hartman break; 1102ab4382d2SGreg Kroah-Hartman } 1103ab4382d2SGreg Kroah-Hartman 1104ab4382d2SGreg Kroah-Hartman schedule(); 1105ab4382d2SGreg Kroah-Hartman 1106ab4382d2SGreg Kroah-Hartman /* see if a signal did it */ 1107ab4382d2SGreg Kroah-Hartman if (signal_pending(current)) { 1108ab4382d2SGreg Kroah-Hartman ret = -ERESTARTSYS; 1109ab4382d2SGreg Kroah-Hartman break; 1110ab4382d2SGreg Kroah-Hartman } 1111ab4382d2SGreg Kroah-Hartman 1112ab4382d2SGreg Kroah-Hartman cprev = cnow; 1113ab4382d2SGreg Kroah-Hartman } 1114ab4382d2SGreg Kroah-Hartman 1115ab4382d2SGreg Kroah-Hartman current->state = TASK_RUNNING; 1116ab4382d2SGreg Kroah-Hartman remove_wait_queue(&port->delta_msr_wait, &wait); 1117ab4382d2SGreg Kroah-Hartman 1118ab4382d2SGreg Kroah-Hartman return ret; 1119ab4382d2SGreg Kroah-Hartman } 1120ab4382d2SGreg Kroah-Hartman 1121ab4382d2SGreg Kroah-Hartman /* 1122ab4382d2SGreg Kroah-Hartman * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) 1123ab4382d2SGreg Kroah-Hartman * Return: write counters to the user passed counter struct 1124ab4382d2SGreg Kroah-Hartman * NB: both 1->0 and 0->1 transitions are counted except for 1125ab4382d2SGreg Kroah-Hartman * RI where only 0->1 is counted. 1126ab4382d2SGreg Kroah-Hartman */ 1127ab4382d2SGreg Kroah-Hartman static int uart_get_icount(struct tty_struct *tty, 1128ab4382d2SGreg Kroah-Hartman struct serial_icounter_struct *icount) 1129ab4382d2SGreg Kroah-Hartman { 1130ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1131ab4382d2SGreg Kroah-Hartman struct uart_icount cnow; 1132ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1133ab4382d2SGreg Kroah-Hartman 1134ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1135ab4382d2SGreg Kroah-Hartman memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); 1136ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1137ab4382d2SGreg Kroah-Hartman 1138ab4382d2SGreg Kroah-Hartman icount->cts = cnow.cts; 1139ab4382d2SGreg Kroah-Hartman icount->dsr = cnow.dsr; 1140ab4382d2SGreg Kroah-Hartman icount->rng = cnow.rng; 1141ab4382d2SGreg Kroah-Hartman icount->dcd = cnow.dcd; 1142ab4382d2SGreg Kroah-Hartman icount->rx = cnow.rx; 1143ab4382d2SGreg Kroah-Hartman icount->tx = cnow.tx; 1144ab4382d2SGreg Kroah-Hartman icount->frame = cnow.frame; 1145ab4382d2SGreg Kroah-Hartman icount->overrun = cnow.overrun; 1146ab4382d2SGreg Kroah-Hartman icount->parity = cnow.parity; 1147ab4382d2SGreg Kroah-Hartman icount->brk = cnow.brk; 1148ab4382d2SGreg Kroah-Hartman icount->buf_overrun = cnow.buf_overrun; 1149ab4382d2SGreg Kroah-Hartman 1150ab4382d2SGreg Kroah-Hartman return 0; 1151ab4382d2SGreg Kroah-Hartman } 1152ab4382d2SGreg Kroah-Hartman 1153ab4382d2SGreg Kroah-Hartman /* 1154ab4382d2SGreg Kroah-Hartman * Called via sys_ioctl. We can use spin_lock_irq() here. 1155ab4382d2SGreg Kroah-Hartman */ 1156ab4382d2SGreg Kroah-Hartman static int 11576caa76b7SAlan Cox uart_ioctl(struct tty_struct *tty, unsigned int cmd, 1158ab4382d2SGreg Kroah-Hartman unsigned long arg) 1159ab4382d2SGreg Kroah-Hartman { 1160ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1161ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1162ab4382d2SGreg Kroah-Hartman void __user *uarg = (void __user *)arg; 1163ab4382d2SGreg Kroah-Hartman int ret = -ENOIOCTLCMD; 1164ab4382d2SGreg Kroah-Hartman 1165ab4382d2SGreg Kroah-Hartman 1166ab4382d2SGreg Kroah-Hartman /* 1167ab4382d2SGreg Kroah-Hartman * These ioctls don't rely on the hardware to be present. 1168ab4382d2SGreg Kroah-Hartman */ 1169ab4382d2SGreg Kroah-Hartman switch (cmd) { 1170ab4382d2SGreg Kroah-Hartman case TIOCGSERIAL: 11719f109694SAlan Cox ret = uart_get_info_user(port, uarg); 1172ab4382d2SGreg Kroah-Hartman break; 1173ab4382d2SGreg Kroah-Hartman 1174ab4382d2SGreg Kroah-Hartman case TIOCSSERIAL: 11757ba2e769SAlan Cox ret = uart_set_info_user(tty, state, uarg); 1176ab4382d2SGreg Kroah-Hartman break; 1177ab4382d2SGreg Kroah-Hartman 1178ab4382d2SGreg Kroah-Hartman case TIOCSERCONFIG: 1179ab4382d2SGreg Kroah-Hartman ret = uart_do_autoconfig(tty, state); 1180ab4382d2SGreg Kroah-Hartman break; 1181ab4382d2SGreg Kroah-Hartman 1182ab4382d2SGreg Kroah-Hartman case TIOCSERGWILD: /* obsolete */ 1183ab4382d2SGreg Kroah-Hartman case TIOCSERSWILD: /* obsolete */ 1184ab4382d2SGreg Kroah-Hartman ret = 0; 1185ab4382d2SGreg Kroah-Hartman break; 1186ab4382d2SGreg Kroah-Hartman } 1187ab4382d2SGreg Kroah-Hartman 1188ab4382d2SGreg Kroah-Hartman if (ret != -ENOIOCTLCMD) 1189ab4382d2SGreg Kroah-Hartman goto out; 1190ab4382d2SGreg Kroah-Hartman 1191ab4382d2SGreg Kroah-Hartman if (tty->flags & (1 << TTY_IO_ERROR)) { 1192ab4382d2SGreg Kroah-Hartman ret = -EIO; 1193ab4382d2SGreg Kroah-Hartman goto out; 1194ab4382d2SGreg Kroah-Hartman } 1195ab4382d2SGreg Kroah-Hartman 1196ab4382d2SGreg Kroah-Hartman /* 1197ab4382d2SGreg Kroah-Hartman * The following should only be used when hardware is present. 1198ab4382d2SGreg Kroah-Hartman */ 1199ab4382d2SGreg Kroah-Hartman switch (cmd) { 1200ab4382d2SGreg Kroah-Hartman case TIOCMIWAIT: 1201ab4382d2SGreg Kroah-Hartman ret = uart_wait_modem_status(state, arg); 1202ab4382d2SGreg Kroah-Hartman break; 1203ab4382d2SGreg Kroah-Hartman } 1204ab4382d2SGreg Kroah-Hartman 1205ab4382d2SGreg Kroah-Hartman if (ret != -ENOIOCTLCMD) 1206ab4382d2SGreg Kroah-Hartman goto out; 1207ab4382d2SGreg Kroah-Hartman 1208ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1209ab4382d2SGreg Kroah-Hartman 12106caa76b7SAlan Cox if (tty->flags & (1 << TTY_IO_ERROR)) { 1211ab4382d2SGreg Kroah-Hartman ret = -EIO; 1212ab4382d2SGreg Kroah-Hartman goto out_up; 1213ab4382d2SGreg Kroah-Hartman } 1214ab4382d2SGreg Kroah-Hartman 1215ab4382d2SGreg Kroah-Hartman /* 1216ab4382d2SGreg Kroah-Hartman * All these rely on hardware being present and need to be 1217ab4382d2SGreg Kroah-Hartman * protected against the tty being hung up. 1218ab4382d2SGreg Kroah-Hartman */ 1219ab4382d2SGreg Kroah-Hartman switch (cmd) { 1220ab4382d2SGreg Kroah-Hartman case TIOCSERGETLSR: /* Get line status register */ 1221ab4382d2SGreg Kroah-Hartman ret = uart_get_lsr_info(tty, state, uarg); 1222ab4382d2SGreg Kroah-Hartman break; 1223ab4382d2SGreg Kroah-Hartman 1224ab4382d2SGreg Kroah-Hartman default: { 1225ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1226ab4382d2SGreg Kroah-Hartman if (uport->ops->ioctl) 1227ab4382d2SGreg Kroah-Hartman ret = uport->ops->ioctl(uport, cmd, arg); 1228ab4382d2SGreg Kroah-Hartman break; 1229ab4382d2SGreg Kroah-Hartman } 1230ab4382d2SGreg Kroah-Hartman } 1231ab4382d2SGreg Kroah-Hartman out_up: 1232ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1233ab4382d2SGreg Kroah-Hartman out: 1234ab4382d2SGreg Kroah-Hartman return ret; 1235ab4382d2SGreg Kroah-Hartman } 1236ab4382d2SGreg Kroah-Hartman 1237ab4382d2SGreg Kroah-Hartman static void uart_set_ldisc(struct tty_struct *tty) 1238ab4382d2SGreg Kroah-Hartman { 1239ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1240ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1241ab4382d2SGreg Kroah-Hartman 1242ab4382d2SGreg Kroah-Hartman if (uport->ops->set_ldisc) 1243adc8d746SAlan Cox uport->ops->set_ldisc(uport, tty->termios.c_line); 1244ab4382d2SGreg Kroah-Hartman } 1245ab4382d2SGreg Kroah-Hartman 1246ab4382d2SGreg Kroah-Hartman static void uart_set_termios(struct tty_struct *tty, 1247ab4382d2SGreg Kroah-Hartman struct ktermios *old_termios) 1248ab4382d2SGreg Kroah-Hartman { 1249ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1250dec94e70SRussell King struct uart_port *uport = state->uart_port; 1251ab4382d2SGreg Kroah-Hartman unsigned long flags; 1252adc8d746SAlan Cox unsigned int cflag = tty->termios.c_cflag; 12532cbacafdSRussell King unsigned int iflag_mask = IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK; 12542cbacafdSRussell King bool sw_changed = false; 1255ab4382d2SGreg Kroah-Hartman 12562cbacafdSRussell King /* 12572cbacafdSRussell King * Drivers doing software flow control also need to know 12582cbacafdSRussell King * about changes to these input settings. 12592cbacafdSRussell King */ 12602cbacafdSRussell King if (uport->flags & UPF_SOFT_FLOW) { 12612cbacafdSRussell King iflag_mask |= IXANY|IXON|IXOFF; 12622cbacafdSRussell King sw_changed = 12632cbacafdSRussell King tty->termios.c_cc[VSTART] != old_termios->c_cc[VSTART] || 12642cbacafdSRussell King tty->termios.c_cc[VSTOP] != old_termios->c_cc[VSTOP]; 12652cbacafdSRussell King } 1266ab4382d2SGreg Kroah-Hartman 1267ab4382d2SGreg Kroah-Hartman /* 1268ab4382d2SGreg Kroah-Hartman * These are the bits that are used to setup various 1269ab4382d2SGreg Kroah-Hartman * flags in the low level driver. We can ignore the Bfoo 1270ab4382d2SGreg Kroah-Hartman * bits in c_cflag; c_[io]speed will always be set 1271ab4382d2SGreg Kroah-Hartman * appropriately by set_termios() in tty_ioctl.c 1272ab4382d2SGreg Kroah-Hartman */ 1273ab4382d2SGreg Kroah-Hartman if ((cflag ^ old_termios->c_cflag) == 0 && 1274adc8d746SAlan Cox tty->termios.c_ospeed == old_termios->c_ospeed && 1275adc8d746SAlan Cox tty->termios.c_ispeed == old_termios->c_ispeed && 12762cbacafdSRussell King ((tty->termios.c_iflag ^ old_termios->c_iflag) & iflag_mask) == 0 && 12772cbacafdSRussell King !sw_changed) { 1278ab4382d2SGreg Kroah-Hartman return; 1279ab4382d2SGreg Kroah-Hartman } 1280ab4382d2SGreg Kroah-Hartman 1281ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, old_termios); 1282c18b55fdSPeter Hurley /* reload cflag from termios; port driver may have overriden flags */ 1283c18b55fdSPeter Hurley cflag = tty->termios.c_cflag; 1284ab4382d2SGreg Kroah-Hartman 1285ab4382d2SGreg Kroah-Hartman /* Handle transition to B0 status */ 1286ab4382d2SGreg Kroah-Hartman if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) 1287dec94e70SRussell King uart_clear_mctrl(uport, TIOCM_RTS | TIOCM_DTR); 1288ab4382d2SGreg Kroah-Hartman /* Handle transition away from B0 status */ 1289ab4382d2SGreg Kroah-Hartman else if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { 1290ab4382d2SGreg Kroah-Hartman unsigned int mask = TIOCM_DTR; 129199abf3b9SPeter Hurley if (!(cflag & CRTSCTS) || !test_bit(TTY_THROTTLED, &tty->flags)) 1292ab4382d2SGreg Kroah-Hartman mask |= TIOCM_RTS; 1293dec94e70SRussell King uart_set_mctrl(uport, mask); 1294ab4382d2SGreg Kroah-Hartman } 1295ab4382d2SGreg Kroah-Hartman 1296dba05832SRussell King /* 1297dba05832SRussell King * If the port is doing h/w assisted flow control, do nothing. 1298dba05832SRussell King * We assume that tty->hw_stopped has never been set. 1299dba05832SRussell King */ 1300dba05832SRussell King if (uport->flags & UPF_HARD_FLOW) 1301dba05832SRussell King return; 1302dba05832SRussell King 1303ab4382d2SGreg Kroah-Hartman /* Handle turning off CRTSCTS */ 1304ab4382d2SGreg Kroah-Hartman if ((old_termios->c_cflag & CRTSCTS) && !(cflag & CRTSCTS)) { 1305dec94e70SRussell King spin_lock_irqsave(&uport->lock, flags); 1306ab4382d2SGreg Kroah-Hartman tty->hw_stopped = 0; 1307ab4382d2SGreg Kroah-Hartman __uart_start(tty); 1308dec94e70SRussell King spin_unlock_irqrestore(&uport->lock, flags); 1309ab4382d2SGreg Kroah-Hartman } 1310ab4382d2SGreg Kroah-Hartman /* Handle turning on CRTSCTS */ 1311ab4382d2SGreg Kroah-Hartman else if (!(old_termios->c_cflag & CRTSCTS) && (cflag & CRTSCTS)) { 1312dec94e70SRussell King spin_lock_irqsave(&uport->lock, flags); 1313dec94e70SRussell King if (!(uport->ops->get_mctrl(uport) & TIOCM_CTS)) { 1314ab4382d2SGreg Kroah-Hartman tty->hw_stopped = 1; 1315dec94e70SRussell King uport->ops->stop_tx(uport); 1316ab4382d2SGreg Kroah-Hartman } 1317dec94e70SRussell King spin_unlock_irqrestore(&uport->lock, flags); 1318ab4382d2SGreg Kroah-Hartman } 1319ab4382d2SGreg Kroah-Hartman } 1320ab4382d2SGreg Kroah-Hartman 1321ab4382d2SGreg Kroah-Hartman /* 1322ef4f527cSKevin Cernekee * Calls to uart_close() are serialised via the tty_lock in 1323ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:tty_release() 1324ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:do_tty_hangup() 1325ef4f527cSKevin Cernekee * This runs from a workqueue and can sleep for a _short_ time only. 1326ab4382d2SGreg Kroah-Hartman */ 1327ab4382d2SGreg Kroah-Hartman static void uart_close(struct tty_struct *tty, struct file *filp) 1328ab4382d2SGreg Kroah-Hartman { 1329ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1330ab4382d2SGreg Kroah-Hartman struct tty_port *port; 1331ab4382d2SGreg Kroah-Hartman struct uart_port *uport; 1332ab4382d2SGreg Kroah-Hartman unsigned long flags; 1333ab4382d2SGreg Kroah-Hartman 1334ab4382d2SGreg Kroah-Hartman if (!state) 1335ab4382d2SGreg Kroah-Hartman return; 1336ab4382d2SGreg Kroah-Hartman 1337ab4382d2SGreg Kroah-Hartman uport = state->uart_port; 1338ab4382d2SGreg Kroah-Hartman port = &state->port; 1339ab4382d2SGreg Kroah-Hartman 13404ed94cd4SGeert Uytterhoeven pr_debug("uart_close(%d) called\n", uport ? uport->line : -1); 1341ab4382d2SGreg Kroah-Hartman 13424ed94cd4SGeert Uytterhoeven if (!port->count || tty_port_close_start(port, tty, filp) == 0) 134355956216SNobuhiro Iwamatsu return; 1344ab4382d2SGreg Kroah-Hartman 1345ab4382d2SGreg Kroah-Hartman /* 1346ab4382d2SGreg Kroah-Hartman * At this point, we stop accepting input. To do this, we 1347ab4382d2SGreg Kroah-Hartman * disable the receive line status interrupts. 1348ab4382d2SGreg Kroah-Hartman */ 1349ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_INITIALIZED) { 1350ab4382d2SGreg Kroah-Hartman unsigned long flags; 1351ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&uport->lock, flags); 1352ab4382d2SGreg Kroah-Hartman uport->ops->stop_rx(uport); 1353ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&uport->lock, flags); 1354ab4382d2SGreg Kroah-Hartman /* 1355ab4382d2SGreg Kroah-Hartman * Before we drop DTR, make sure the UART transmitter 1356ab4382d2SGreg Kroah-Hartman * has completely drained; this is especially 1357ab4382d2SGreg Kroah-Hartman * important if there is a transmit FIFO! 1358ab4382d2SGreg Kroah-Hartman */ 13591f33a51dSJiri Slaby uart_wait_until_sent(tty, uport->timeout); 1360ab4382d2SGreg Kroah-Hartman } 1361ab4382d2SGreg Kroah-Hartman 1362bafb0bd2SJiri Slaby mutex_lock(&port->mutex); 1363ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 1364ab4382d2SGreg Kroah-Hartman uart_flush_buffer(tty); 1365ab4382d2SGreg Kroah-Hartman 1366ab4382d2SGreg Kroah-Hartman tty_ldisc_flush(tty); 1367ab4382d2SGreg Kroah-Hartman 1368ab4382d2SGreg Kroah-Hartman tty_port_tty_set(port, NULL); 1369ab4382d2SGreg Kroah-Hartman tty->closing = 0; 1370ddc7b758SPeter Hurley spin_lock_irqsave(&port->lock, flags); 1371ab4382d2SGreg Kroah-Hartman 1372ab4382d2SGreg Kroah-Hartman if (port->blocked_open) { 1373ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 1374ab4382d2SGreg Kroah-Hartman if (port->close_delay) 13754cb0fbfdSJiri Slaby msleep_interruptible( 13764cb0fbfdSJiri Slaby jiffies_to_msecs(port->close_delay)); 1377ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 1378ab4382d2SGreg Kroah-Hartman } else if (!uart_console(uport)) { 1379ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 13806f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_OFF); 1381ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 1382ab4382d2SGreg Kroah-Hartman } 1383ab4382d2SGreg Kroah-Hartman 1384ab4382d2SGreg Kroah-Hartman /* 1385ab4382d2SGreg Kroah-Hartman * Wake up anyone trying to open this port. 1386ab4382d2SGreg Kroah-Hartman */ 1387ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); 1388426929f8SJiri Slaby clear_bit(ASYNCB_CLOSING, &port->flags); 1389ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 1390ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->open_wait); 1391426929f8SJiri Slaby wake_up_interruptible(&port->close_wait); 1392ab4382d2SGreg Kroah-Hartman 1393ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1394ab4382d2SGreg Kroah-Hartman } 1395ab4382d2SGreg Kroah-Hartman 13961f33a51dSJiri Slaby static void uart_wait_until_sent(struct tty_struct *tty, int timeout) 1397ab4382d2SGreg Kroah-Hartman { 13981f33a51dSJiri Slaby struct uart_state *state = tty->driver_data; 13991f33a51dSJiri Slaby struct uart_port *port = state->uart_port; 1400ab4382d2SGreg Kroah-Hartman unsigned long char_time, expire; 1401ab4382d2SGreg Kroah-Hartman 1402ab4382d2SGreg Kroah-Hartman if (port->type == PORT_UNKNOWN || port->fifosize == 0) 1403ab4382d2SGreg Kroah-Hartman return; 1404ab4382d2SGreg Kroah-Hartman 1405ab4382d2SGreg Kroah-Hartman /* 1406ab4382d2SGreg Kroah-Hartman * Set the check interval to be 1/5 of the estimated time to 1407ab4382d2SGreg Kroah-Hartman * send a single character, and make it at least 1. The check 1408ab4382d2SGreg Kroah-Hartman * interval should also be less than the timeout. 1409ab4382d2SGreg Kroah-Hartman * 1410ab4382d2SGreg Kroah-Hartman * Note: we have to use pretty tight timings here to satisfy 1411ab4382d2SGreg Kroah-Hartman * the NIST-PCTS. 1412ab4382d2SGreg Kroah-Hartman */ 1413ab4382d2SGreg Kroah-Hartman char_time = (port->timeout - HZ/50) / port->fifosize; 1414ab4382d2SGreg Kroah-Hartman char_time = char_time / 5; 1415ab4382d2SGreg Kroah-Hartman if (char_time == 0) 1416ab4382d2SGreg Kroah-Hartman char_time = 1; 1417ab4382d2SGreg Kroah-Hartman if (timeout && timeout < char_time) 1418ab4382d2SGreg Kroah-Hartman char_time = timeout; 1419ab4382d2SGreg Kroah-Hartman 1420ab4382d2SGreg Kroah-Hartman /* 1421ab4382d2SGreg Kroah-Hartman * If the transmitter hasn't cleared in twice the approximate 1422ab4382d2SGreg Kroah-Hartman * amount of time to send the entire FIFO, it probably won't 1423ab4382d2SGreg Kroah-Hartman * ever clear. This assumes the UART isn't doing flow 1424ab4382d2SGreg Kroah-Hartman * control, which is currently the case. Hence, if it ever 1425ab4382d2SGreg Kroah-Hartman * takes longer than port->timeout, this is probably due to a 1426ab4382d2SGreg Kroah-Hartman * UART bug of some kind. So, we clamp the timeout parameter at 1427ab4382d2SGreg Kroah-Hartman * 2*port->timeout. 1428ab4382d2SGreg Kroah-Hartman */ 1429ab4382d2SGreg Kroah-Hartman if (timeout == 0 || timeout > 2 * port->timeout) 1430ab4382d2SGreg Kroah-Hartman timeout = 2 * port->timeout; 1431ab4382d2SGreg Kroah-Hartman 1432ab4382d2SGreg Kroah-Hartman expire = jiffies + timeout; 1433ab4382d2SGreg Kroah-Hartman 1434ab4382d2SGreg Kroah-Hartman pr_debug("uart_wait_until_sent(%d), jiffies=%lu, expire=%lu...\n", 1435ab4382d2SGreg Kroah-Hartman port->line, jiffies, expire); 1436ab4382d2SGreg Kroah-Hartman 1437ab4382d2SGreg Kroah-Hartman /* 1438ab4382d2SGreg Kroah-Hartman * Check whether the transmitter is empty every 'char_time'. 1439ab4382d2SGreg Kroah-Hartman * 'timeout' / 'expire' give us the maximum amount of time 1440ab4382d2SGreg Kroah-Hartman * we wait. 1441ab4382d2SGreg Kroah-Hartman */ 1442ab4382d2SGreg Kroah-Hartman while (!port->ops->tx_empty(port)) { 1443ab4382d2SGreg Kroah-Hartman msleep_interruptible(jiffies_to_msecs(char_time)); 1444ab4382d2SGreg Kroah-Hartman if (signal_pending(current)) 1445ab4382d2SGreg Kroah-Hartman break; 1446ab4382d2SGreg Kroah-Hartman if (time_after(jiffies, expire)) 1447ab4382d2SGreg Kroah-Hartman break; 1448ab4382d2SGreg Kroah-Hartman } 1449ab4382d2SGreg Kroah-Hartman } 1450ab4382d2SGreg Kroah-Hartman 1451ab4382d2SGreg Kroah-Hartman /* 1452ef4f527cSKevin Cernekee * Calls to uart_hangup() are serialised by the tty_lock in 1453ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:do_tty_hangup() 1454ef4f527cSKevin Cernekee * This runs from a workqueue and can sleep for a _short_ time only. 1455ab4382d2SGreg Kroah-Hartman */ 1456ab4382d2SGreg Kroah-Hartman static void uart_hangup(struct tty_struct *tty) 1457ab4382d2SGreg Kroah-Hartman { 1458ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1459ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1460ab4382d2SGreg Kroah-Hartman unsigned long flags; 1461ab4382d2SGreg Kroah-Hartman 1462ab4382d2SGreg Kroah-Hartman pr_debug("uart_hangup(%d)\n", state->uart_port->line); 1463ab4382d2SGreg Kroah-Hartman 1464ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1465ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_NORMAL_ACTIVE) { 1466ab4382d2SGreg Kroah-Hartman uart_flush_buffer(tty); 1467ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 1468ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 1469ab4382d2SGreg Kroah-Hartman port->count = 0; 1470ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); 1471ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 1472ab4382d2SGreg Kroah-Hartman tty_port_tty_set(port, NULL); 1473bf903c0cSGeert Uytterhoeven if (!uart_console(state->uart_port)) 1474bf903c0cSGeert Uytterhoeven uart_change_pm(state, UART_PM_STATE_OFF); 1475ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->open_wait); 1476ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->delta_msr_wait); 1477ab4382d2SGreg Kroah-Hartman } 1478ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1479ab4382d2SGreg Kroah-Hartman } 1480ab4382d2SGreg Kroah-Hartman 14810b1db830SJiri Slaby static int uart_port_activate(struct tty_port *port, struct tty_struct *tty) 14820b1db830SJiri Slaby { 14830b1db830SJiri Slaby return 0; 14840b1db830SJiri Slaby } 14850b1db830SJiri Slaby 14860b1db830SJiri Slaby static void uart_port_shutdown(struct tty_port *port) 14870b1db830SJiri Slaby { 1488b922e19dSJiri Slaby struct uart_state *state = container_of(port, struct uart_state, port); 1489b922e19dSJiri Slaby struct uart_port *uport = state->uart_port; 1490b922e19dSJiri Slaby 1491b922e19dSJiri Slaby /* 1492b922e19dSJiri Slaby * clear delta_msr_wait queue to avoid mem leaks: we may free 1493b922e19dSJiri Slaby * the irq here so the queue might never be woken up. Note 1494b922e19dSJiri Slaby * that we won't end up waiting on delta_msr_wait again since 1495b922e19dSJiri Slaby * any outstanding file descriptors should be pointing at 1496b922e19dSJiri Slaby * hung_up_tty_fops now. 1497b922e19dSJiri Slaby */ 1498b922e19dSJiri Slaby wake_up_interruptible(&port->delta_msr_wait); 1499b922e19dSJiri Slaby 1500b922e19dSJiri Slaby /* 1501b922e19dSJiri Slaby * Free the IRQ and disable the port. 1502b922e19dSJiri Slaby */ 1503b922e19dSJiri Slaby uport->ops->shutdown(uport); 1504b922e19dSJiri Slaby 1505b922e19dSJiri Slaby /* 1506b922e19dSJiri Slaby * Ensure that the IRQ handler isn't running on another CPU. 1507b922e19dSJiri Slaby */ 1508b922e19dSJiri Slaby synchronize_irq(uport->irq); 15090b1db830SJiri Slaby } 15100b1db830SJiri Slaby 1511ab4382d2SGreg Kroah-Hartman static int uart_carrier_raised(struct tty_port *port) 1512ab4382d2SGreg Kroah-Hartman { 1513ab4382d2SGreg Kroah-Hartman struct uart_state *state = container_of(port, struct uart_state, port); 1514ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1515ab4382d2SGreg Kroah-Hartman int mctrl; 1516ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 15171fdc3106SAlexander Shiyan uart_enable_ms(uport); 1518ab4382d2SGreg Kroah-Hartman mctrl = uport->ops->get_mctrl(uport); 1519ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1520ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_CAR) 1521ab4382d2SGreg Kroah-Hartman return 1; 1522ab4382d2SGreg Kroah-Hartman return 0; 1523ab4382d2SGreg Kroah-Hartman } 1524ab4382d2SGreg Kroah-Hartman 1525ab4382d2SGreg Kroah-Hartman static void uart_dtr_rts(struct tty_port *port, int onoff) 1526ab4382d2SGreg Kroah-Hartman { 1527ab4382d2SGreg Kroah-Hartman struct uart_state *state = container_of(port, struct uart_state, port); 1528ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1529ab4382d2SGreg Kroah-Hartman 15306f5c24adSJiri Slaby if (onoff) 1531ab4382d2SGreg Kroah-Hartman uart_set_mctrl(uport, TIOCM_DTR | TIOCM_RTS); 1532ab4382d2SGreg Kroah-Hartman else 1533ab4382d2SGreg Kroah-Hartman uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); 1534ab4382d2SGreg Kroah-Hartman } 1535ab4382d2SGreg Kroah-Hartman 1536ab4382d2SGreg Kroah-Hartman /* 1537ef4f527cSKevin Cernekee * Calls to uart_open are serialised by the tty_lock in 1538ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:tty_open() 1539ab4382d2SGreg Kroah-Hartman * Note that if this fails, then uart_close() _will_ be called. 1540ab4382d2SGreg Kroah-Hartman * 1541ab4382d2SGreg Kroah-Hartman * In time, we want to scrap the "opening nonpresent ports" 1542ab4382d2SGreg Kroah-Hartman * behaviour and implement an alternative way for setserial 1543ab4382d2SGreg Kroah-Hartman * to set base addresses/ports/types. This will allow us to 1544ab4382d2SGreg Kroah-Hartman * get rid of a certain amount of extra tests. 1545ab4382d2SGreg Kroah-Hartman */ 1546ab4382d2SGreg Kroah-Hartman static int uart_open(struct tty_struct *tty, struct file *filp) 1547ab4382d2SGreg Kroah-Hartman { 1548ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = (struct uart_driver *)tty->driver->driver_state; 1549ab4382d2SGreg Kroah-Hartman int retval, line = tty->index; 15501c7b13c4SJiri Slaby struct uart_state *state = drv->state + line; 15511c7b13c4SJiri Slaby struct tty_port *port = &state->port; 1552ab4382d2SGreg Kroah-Hartman 1553ab4382d2SGreg Kroah-Hartman pr_debug("uart_open(%d) called\n", line); 1554ab4382d2SGreg Kroah-Hartman 1555ab4382d2SGreg Kroah-Hartman /* 15561c7b13c4SJiri Slaby * We take the semaphore here to guarantee that we won't be re-entered 15571c7b13c4SJiri Slaby * while allocating the state structure, or while we request any IRQs 15581c7b13c4SJiri Slaby * that the driver may need. This also has the nice side-effect that 15591c7b13c4SJiri Slaby * it delays the action of uart_hangup, so we can guarantee that 15601c7b13c4SJiri Slaby * state->port.tty will always contain something reasonable. 1561ab4382d2SGreg Kroah-Hartman */ 15621c7b13c4SJiri Slaby if (mutex_lock_interruptible(&port->mutex)) { 15631c7b13c4SJiri Slaby retval = -ERESTARTSYS; 15641c7b13c4SJiri Slaby goto end; 1565ab4382d2SGreg Kroah-Hartman } 15661c7b13c4SJiri Slaby 15671c7b13c4SJiri Slaby port->count++; 15681c7b13c4SJiri Slaby if (!state->uart_port || state->uart_port->flags & UPF_DEAD) { 15691c7b13c4SJiri Slaby retval = -ENXIO; 15701c7b13c4SJiri Slaby goto err_dec_count; 15711c7b13c4SJiri Slaby } 1572ab4382d2SGreg Kroah-Hartman 1573ab4382d2SGreg Kroah-Hartman /* 1574ab4382d2SGreg Kroah-Hartman * Once we set tty->driver_data here, we are guaranteed that 1575ab4382d2SGreg Kroah-Hartman * uart_close() will decrement the driver module use count. 1576ab4382d2SGreg Kroah-Hartman * Any failures from here onwards should not touch the count. 1577ab4382d2SGreg Kroah-Hartman */ 1578ab4382d2SGreg Kroah-Hartman tty->driver_data = state; 1579ab4382d2SGreg Kroah-Hartman state->uart_port->state = state; 1580d6c53c0eSJiri Slaby state->port.low_latency = 1581d6c53c0eSJiri Slaby (state->uart_port->flags & UPF_LOW_LATENCY) ? 1 : 0; 1582ab4382d2SGreg Kroah-Hartman tty_port_tty_set(port, tty); 1583ab4382d2SGreg Kroah-Hartman 1584ab4382d2SGreg Kroah-Hartman /* 1585ab4382d2SGreg Kroah-Hartman * Start up the serial port. 1586ab4382d2SGreg Kroah-Hartman */ 1587ab4382d2SGreg Kroah-Hartman retval = uart_startup(tty, state, 0); 1588ab4382d2SGreg Kroah-Hartman 1589ab4382d2SGreg Kroah-Hartman /* 1590ab4382d2SGreg Kroah-Hartman * If we succeeded, wait until the port is ready. 1591ab4382d2SGreg Kroah-Hartman */ 1592ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1593ab4382d2SGreg Kroah-Hartman if (retval == 0) 1594ab4382d2SGreg Kroah-Hartman retval = tty_port_block_til_ready(port, tty, filp); 1595ab4382d2SGreg Kroah-Hartman 15961c7b13c4SJiri Slaby end: 1597ab4382d2SGreg Kroah-Hartman return retval; 15981c7b13c4SJiri Slaby err_dec_count: 15991c7b13c4SJiri Slaby port->count--; 16001c7b13c4SJiri Slaby mutex_unlock(&port->mutex); 16011c7b13c4SJiri Slaby goto end; 1602ab4382d2SGreg Kroah-Hartman } 1603ab4382d2SGreg Kroah-Hartman 1604ab4382d2SGreg Kroah-Hartman static const char *uart_type(struct uart_port *port) 1605ab4382d2SGreg Kroah-Hartman { 1606ab4382d2SGreg Kroah-Hartman const char *str = NULL; 1607ab4382d2SGreg Kroah-Hartman 1608ab4382d2SGreg Kroah-Hartman if (port->ops->type) 1609ab4382d2SGreg Kroah-Hartman str = port->ops->type(port); 1610ab4382d2SGreg Kroah-Hartman 1611ab4382d2SGreg Kroah-Hartman if (!str) 1612ab4382d2SGreg Kroah-Hartman str = "unknown"; 1613ab4382d2SGreg Kroah-Hartman 1614ab4382d2SGreg Kroah-Hartman return str; 1615ab4382d2SGreg Kroah-Hartman } 1616ab4382d2SGreg Kroah-Hartman 1617ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_PROC_FS 1618ab4382d2SGreg Kroah-Hartman 1619ab4382d2SGreg Kroah-Hartman static void uart_line_info(struct seq_file *m, struct uart_driver *drv, int i) 1620ab4382d2SGreg Kroah-Hartman { 1621ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + i; 1622ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 16236f538fe3SLinus Walleij enum uart_pm_state pm_state; 1624ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1625ab4382d2SGreg Kroah-Hartman char stat_buf[32]; 1626ab4382d2SGreg Kroah-Hartman unsigned int status; 1627ab4382d2SGreg Kroah-Hartman int mmio; 1628ab4382d2SGreg Kroah-Hartman 1629ab4382d2SGreg Kroah-Hartman if (!uport) 1630ab4382d2SGreg Kroah-Hartman return; 1631ab4382d2SGreg Kroah-Hartman 1632ab4382d2SGreg Kroah-Hartman mmio = uport->iotype >= UPIO_MEM; 1633ab4382d2SGreg Kroah-Hartman seq_printf(m, "%d: uart:%s %s%08llX irq:%d", 1634ab4382d2SGreg Kroah-Hartman uport->line, uart_type(uport), 1635ab4382d2SGreg Kroah-Hartman mmio ? "mmio:0x" : "port:", 1636ab4382d2SGreg Kroah-Hartman mmio ? (unsigned long long)uport->mapbase 1637ab4382d2SGreg Kroah-Hartman : (unsigned long long)uport->iobase, 1638ab4382d2SGreg Kroah-Hartman uport->irq); 1639ab4382d2SGreg Kroah-Hartman 1640ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) { 1641ab4382d2SGreg Kroah-Hartman seq_putc(m, '\n'); 1642ab4382d2SGreg Kroah-Hartman return; 1643ab4382d2SGreg Kroah-Hartman } 1644ab4382d2SGreg Kroah-Hartman 1645ab4382d2SGreg Kroah-Hartman if (capable(CAP_SYS_ADMIN)) { 1646ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1647ab4382d2SGreg Kroah-Hartman pm_state = state->pm_state; 16486f538fe3SLinus Walleij if (pm_state != UART_PM_STATE_ON) 16496f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 1650ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1651ab4382d2SGreg Kroah-Hartman status = uport->ops->get_mctrl(uport); 1652ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 16536f538fe3SLinus Walleij if (pm_state != UART_PM_STATE_ON) 1654ab4382d2SGreg Kroah-Hartman uart_change_pm(state, pm_state); 1655ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1656ab4382d2SGreg Kroah-Hartman 1657ab4382d2SGreg Kroah-Hartman seq_printf(m, " tx:%d rx:%d", 1658ab4382d2SGreg Kroah-Hartman uport->icount.tx, uport->icount.rx); 1659ab4382d2SGreg Kroah-Hartman if (uport->icount.frame) 1660ab4382d2SGreg Kroah-Hartman seq_printf(m, " fe:%d", 1661ab4382d2SGreg Kroah-Hartman uport->icount.frame); 1662ab4382d2SGreg Kroah-Hartman if (uport->icount.parity) 1663ab4382d2SGreg Kroah-Hartman seq_printf(m, " pe:%d", 1664ab4382d2SGreg Kroah-Hartman uport->icount.parity); 1665ab4382d2SGreg Kroah-Hartman if (uport->icount.brk) 1666ab4382d2SGreg Kroah-Hartman seq_printf(m, " brk:%d", 1667ab4382d2SGreg Kroah-Hartman uport->icount.brk); 1668ab4382d2SGreg Kroah-Hartman if (uport->icount.overrun) 1669ab4382d2SGreg Kroah-Hartman seq_printf(m, " oe:%d", 1670ab4382d2SGreg Kroah-Hartman uport->icount.overrun); 1671ab4382d2SGreg Kroah-Hartman 1672ab4382d2SGreg Kroah-Hartman #define INFOBIT(bit, str) \ 1673ab4382d2SGreg Kroah-Hartman if (uport->mctrl & (bit)) \ 1674ab4382d2SGreg Kroah-Hartman strncat(stat_buf, (str), sizeof(stat_buf) - \ 1675ab4382d2SGreg Kroah-Hartman strlen(stat_buf) - 2) 1676ab4382d2SGreg Kroah-Hartman #define STATBIT(bit, str) \ 1677ab4382d2SGreg Kroah-Hartman if (status & (bit)) \ 1678ab4382d2SGreg Kroah-Hartman strncat(stat_buf, (str), sizeof(stat_buf) - \ 1679ab4382d2SGreg Kroah-Hartman strlen(stat_buf) - 2) 1680ab4382d2SGreg Kroah-Hartman 1681ab4382d2SGreg Kroah-Hartman stat_buf[0] = '\0'; 1682ab4382d2SGreg Kroah-Hartman stat_buf[1] = '\0'; 1683ab4382d2SGreg Kroah-Hartman INFOBIT(TIOCM_RTS, "|RTS"); 1684ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_CTS, "|CTS"); 1685ab4382d2SGreg Kroah-Hartman INFOBIT(TIOCM_DTR, "|DTR"); 1686ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_DSR, "|DSR"); 1687ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_CAR, "|CD"); 1688ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_RNG, "|RI"); 1689ab4382d2SGreg Kroah-Hartman if (stat_buf[0]) 1690ab4382d2SGreg Kroah-Hartman stat_buf[0] = ' '; 1691ab4382d2SGreg Kroah-Hartman 1692ab4382d2SGreg Kroah-Hartman seq_puts(m, stat_buf); 1693ab4382d2SGreg Kroah-Hartman } 1694ab4382d2SGreg Kroah-Hartman seq_putc(m, '\n'); 1695ab4382d2SGreg Kroah-Hartman #undef STATBIT 1696ab4382d2SGreg Kroah-Hartman #undef INFOBIT 1697ab4382d2SGreg Kroah-Hartman } 1698ab4382d2SGreg Kroah-Hartman 1699ab4382d2SGreg Kroah-Hartman static int uart_proc_show(struct seq_file *m, void *v) 1700ab4382d2SGreg Kroah-Hartman { 1701ab4382d2SGreg Kroah-Hartman struct tty_driver *ttydrv = m->private; 1702ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = ttydrv->driver_state; 1703ab4382d2SGreg Kroah-Hartman int i; 1704ab4382d2SGreg Kroah-Hartman 1705ab4382d2SGreg Kroah-Hartman seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n", 1706ab4382d2SGreg Kroah-Hartman "", "", ""); 1707ab4382d2SGreg Kroah-Hartman for (i = 0; i < drv->nr; i++) 1708ab4382d2SGreg Kroah-Hartman uart_line_info(m, drv, i); 1709ab4382d2SGreg Kroah-Hartman return 0; 1710ab4382d2SGreg Kroah-Hartman } 1711ab4382d2SGreg Kroah-Hartman 1712ab4382d2SGreg Kroah-Hartman static int uart_proc_open(struct inode *inode, struct file *file) 1713ab4382d2SGreg Kroah-Hartman { 1714d9dda78bSAl Viro return single_open(file, uart_proc_show, PDE_DATA(inode)); 1715ab4382d2SGreg Kroah-Hartman } 1716ab4382d2SGreg Kroah-Hartman 1717ab4382d2SGreg Kroah-Hartman static const struct file_operations uart_proc_fops = { 1718ab4382d2SGreg Kroah-Hartman .owner = THIS_MODULE, 1719ab4382d2SGreg Kroah-Hartman .open = uart_proc_open, 1720ab4382d2SGreg Kroah-Hartman .read = seq_read, 1721ab4382d2SGreg Kroah-Hartman .llseek = seq_lseek, 1722ab4382d2SGreg Kroah-Hartman .release = single_release, 1723ab4382d2SGreg Kroah-Hartman }; 1724ab4382d2SGreg Kroah-Hartman #endif 1725ab4382d2SGreg Kroah-Hartman 1726ab4382d2SGreg Kroah-Hartman #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL) 1727ab4382d2SGreg Kroah-Hartman /* 1728ab4382d2SGreg Kroah-Hartman * uart_console_write - write a console message to a serial port 1729ab4382d2SGreg Kroah-Hartman * @port: the port to write the message 1730ab4382d2SGreg Kroah-Hartman * @s: array of characters 1731ab4382d2SGreg Kroah-Hartman * @count: number of characters in string to write 1732ab4382d2SGreg Kroah-Hartman * @write: function to write character to port 1733ab4382d2SGreg Kroah-Hartman */ 1734ab4382d2SGreg Kroah-Hartman void uart_console_write(struct uart_port *port, const char *s, 1735ab4382d2SGreg Kroah-Hartman unsigned int count, 1736ab4382d2SGreg Kroah-Hartman void (*putchar)(struct uart_port *, int)) 1737ab4382d2SGreg Kroah-Hartman { 1738ab4382d2SGreg Kroah-Hartman unsigned int i; 1739ab4382d2SGreg Kroah-Hartman 1740ab4382d2SGreg Kroah-Hartman for (i = 0; i < count; i++, s++) { 1741ab4382d2SGreg Kroah-Hartman if (*s == '\n') 1742ab4382d2SGreg Kroah-Hartman putchar(port, '\r'); 1743ab4382d2SGreg Kroah-Hartman putchar(port, *s); 1744ab4382d2SGreg Kroah-Hartman } 1745ab4382d2SGreg Kroah-Hartman } 1746ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_console_write); 1747ab4382d2SGreg Kroah-Hartman 1748ab4382d2SGreg Kroah-Hartman /* 1749ab4382d2SGreg Kroah-Hartman * Check whether an invalid uart number has been specified, and 1750ab4382d2SGreg Kroah-Hartman * if so, search for the first available port that does have 1751ab4382d2SGreg Kroah-Hartman * console support. 1752ab4382d2SGreg Kroah-Hartman */ 1753ab4382d2SGreg Kroah-Hartman struct uart_port * __init 1754ab4382d2SGreg Kroah-Hartman uart_get_console(struct uart_port *ports, int nr, struct console *co) 1755ab4382d2SGreg Kroah-Hartman { 1756ab4382d2SGreg Kroah-Hartman int idx = co->index; 1757ab4382d2SGreg Kroah-Hartman 1758ab4382d2SGreg Kroah-Hartman if (idx < 0 || idx >= nr || (ports[idx].iobase == 0 && 1759ab4382d2SGreg Kroah-Hartman ports[idx].membase == NULL)) 1760ab4382d2SGreg Kroah-Hartman for (idx = 0; idx < nr; idx++) 1761ab4382d2SGreg Kroah-Hartman if (ports[idx].iobase != 0 || 1762ab4382d2SGreg Kroah-Hartman ports[idx].membase != NULL) 1763ab4382d2SGreg Kroah-Hartman break; 1764ab4382d2SGreg Kroah-Hartman 1765ab4382d2SGreg Kroah-Hartman co->index = idx; 1766ab4382d2SGreg Kroah-Hartman 1767ab4382d2SGreg Kroah-Hartman return ports + idx; 1768ab4382d2SGreg Kroah-Hartman } 1769ab4382d2SGreg Kroah-Hartman 1770ab4382d2SGreg Kroah-Hartman /** 177102088ca6SGeert Uytterhoeven * uart_parse_options - Parse serial port baud/parity/bits/flow control. 1772ab4382d2SGreg Kroah-Hartman * @options: pointer to option string 1773ab4382d2SGreg Kroah-Hartman * @baud: pointer to an 'int' variable for the baud rate. 1774ab4382d2SGreg Kroah-Hartman * @parity: pointer to an 'int' variable for the parity. 1775ab4382d2SGreg Kroah-Hartman * @bits: pointer to an 'int' variable for the number of data bits. 1776ab4382d2SGreg Kroah-Hartman * @flow: pointer to an 'int' variable for the flow control character. 1777ab4382d2SGreg Kroah-Hartman * 1778ab4382d2SGreg Kroah-Hartman * uart_parse_options decodes a string containing the serial console 1779ab4382d2SGreg Kroah-Hartman * options. The format of the string is <baud><parity><bits><flow>, 1780ab4382d2SGreg Kroah-Hartman * eg: 115200n8r 1781ab4382d2SGreg Kroah-Hartman */ 1782ab4382d2SGreg Kroah-Hartman void 1783ab4382d2SGreg Kroah-Hartman uart_parse_options(char *options, int *baud, int *parity, int *bits, int *flow) 1784ab4382d2SGreg Kroah-Hartman { 1785ab4382d2SGreg Kroah-Hartman char *s = options; 1786ab4382d2SGreg Kroah-Hartman 1787ab4382d2SGreg Kroah-Hartman *baud = simple_strtoul(s, NULL, 10); 1788ab4382d2SGreg Kroah-Hartman while (*s >= '0' && *s <= '9') 1789ab4382d2SGreg Kroah-Hartman s++; 1790ab4382d2SGreg Kroah-Hartman if (*s) 1791ab4382d2SGreg Kroah-Hartman *parity = *s++; 1792ab4382d2SGreg Kroah-Hartman if (*s) 1793ab4382d2SGreg Kroah-Hartman *bits = *s++ - '0'; 1794ab4382d2SGreg Kroah-Hartman if (*s) 1795ab4382d2SGreg Kroah-Hartman *flow = *s; 1796ab4382d2SGreg Kroah-Hartman } 1797ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_parse_options); 1798ab4382d2SGreg Kroah-Hartman 1799ab4382d2SGreg Kroah-Hartman struct baud_rates { 1800ab4382d2SGreg Kroah-Hartman unsigned int rate; 1801ab4382d2SGreg Kroah-Hartman unsigned int cflag; 1802ab4382d2SGreg Kroah-Hartman }; 1803ab4382d2SGreg Kroah-Hartman 1804ab4382d2SGreg Kroah-Hartman static const struct baud_rates baud_rates[] = { 1805ab4382d2SGreg Kroah-Hartman { 921600, B921600 }, 1806ab4382d2SGreg Kroah-Hartman { 460800, B460800 }, 1807ab4382d2SGreg Kroah-Hartman { 230400, B230400 }, 1808ab4382d2SGreg Kroah-Hartman { 115200, B115200 }, 1809ab4382d2SGreg Kroah-Hartman { 57600, B57600 }, 1810ab4382d2SGreg Kroah-Hartman { 38400, B38400 }, 1811ab4382d2SGreg Kroah-Hartman { 19200, B19200 }, 1812ab4382d2SGreg Kroah-Hartman { 9600, B9600 }, 1813ab4382d2SGreg Kroah-Hartman { 4800, B4800 }, 1814ab4382d2SGreg Kroah-Hartman { 2400, B2400 }, 1815ab4382d2SGreg Kroah-Hartman { 1200, B1200 }, 1816ab4382d2SGreg Kroah-Hartman { 0, B38400 } 1817ab4382d2SGreg Kroah-Hartman }; 1818ab4382d2SGreg Kroah-Hartman 1819ab4382d2SGreg Kroah-Hartman /** 1820ab4382d2SGreg Kroah-Hartman * uart_set_options - setup the serial console parameters 1821ab4382d2SGreg Kroah-Hartman * @port: pointer to the serial ports uart_port structure 1822ab4382d2SGreg Kroah-Hartman * @co: console pointer 1823ab4382d2SGreg Kroah-Hartman * @baud: baud rate 1824ab4382d2SGreg Kroah-Hartman * @parity: parity character - 'n' (none), 'o' (odd), 'e' (even) 1825ab4382d2SGreg Kroah-Hartman * @bits: number of data bits 1826ab4382d2SGreg Kroah-Hartman * @flow: flow control character - 'r' (rts) 1827ab4382d2SGreg Kroah-Hartman */ 1828ab4382d2SGreg Kroah-Hartman int 1829ab4382d2SGreg Kroah-Hartman uart_set_options(struct uart_port *port, struct console *co, 1830ab4382d2SGreg Kroah-Hartman int baud, int parity, int bits, int flow) 1831ab4382d2SGreg Kroah-Hartman { 1832ab4382d2SGreg Kroah-Hartman struct ktermios termios; 1833ab4382d2SGreg Kroah-Hartman static struct ktermios dummy; 1834ab4382d2SGreg Kroah-Hartman int i; 1835ab4382d2SGreg Kroah-Hartman 1836ab4382d2SGreg Kroah-Hartman /* 1837ab4382d2SGreg Kroah-Hartman * Ensure that the serial console lock is initialised 1838ab4382d2SGreg Kroah-Hartman * early. 183942b6a1baSRandy Witt * If this port is a console, then the spinlock is already 184042b6a1baSRandy Witt * initialised. 1841ab4382d2SGreg Kroah-Hartman */ 184242b6a1baSRandy Witt if (!(uart_console(port) && (port->cons->flags & CON_ENABLED))) { 1843ab4382d2SGreg Kroah-Hartman spin_lock_init(&port->lock); 1844ab4382d2SGreg Kroah-Hartman lockdep_set_class(&port->lock, &port_lock_key); 184542b6a1baSRandy Witt } 1846ab4382d2SGreg Kroah-Hartman 1847ab4382d2SGreg Kroah-Hartman memset(&termios, 0, sizeof(struct ktermios)); 1848ab4382d2SGreg Kroah-Hartman 1849ab4382d2SGreg Kroah-Hartman termios.c_cflag = CREAD | HUPCL | CLOCAL; 1850ab4382d2SGreg Kroah-Hartman 1851ab4382d2SGreg Kroah-Hartman /* 1852ab4382d2SGreg Kroah-Hartman * Construct a cflag setting. 1853ab4382d2SGreg Kroah-Hartman */ 1854ab4382d2SGreg Kroah-Hartman for (i = 0; baud_rates[i].rate; i++) 1855ab4382d2SGreg Kroah-Hartman if (baud_rates[i].rate <= baud) 1856ab4382d2SGreg Kroah-Hartman break; 1857ab4382d2SGreg Kroah-Hartman 1858ab4382d2SGreg Kroah-Hartman termios.c_cflag |= baud_rates[i].cflag; 1859ab4382d2SGreg Kroah-Hartman 1860ab4382d2SGreg Kroah-Hartman if (bits == 7) 1861ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CS7; 1862ab4382d2SGreg Kroah-Hartman else 1863ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CS8; 1864ab4382d2SGreg Kroah-Hartman 1865ab4382d2SGreg Kroah-Hartman switch (parity) { 1866ab4382d2SGreg Kroah-Hartman case 'o': case 'O': 1867ab4382d2SGreg Kroah-Hartman termios.c_cflag |= PARODD; 1868ab4382d2SGreg Kroah-Hartman /*fall through*/ 1869ab4382d2SGreg Kroah-Hartman case 'e': case 'E': 1870ab4382d2SGreg Kroah-Hartman termios.c_cflag |= PARENB; 1871ab4382d2SGreg Kroah-Hartman break; 1872ab4382d2SGreg Kroah-Hartman } 1873ab4382d2SGreg Kroah-Hartman 1874ab4382d2SGreg Kroah-Hartman if (flow == 'r') 1875ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CRTSCTS; 1876ab4382d2SGreg Kroah-Hartman 1877ab4382d2SGreg Kroah-Hartman /* 1878ab4382d2SGreg Kroah-Hartman * some uarts on other side don't support no flow control. 1879ab4382d2SGreg Kroah-Hartman * So we set * DTR in host uart to make them happy 1880ab4382d2SGreg Kroah-Hartman */ 1881ab4382d2SGreg Kroah-Hartman port->mctrl |= TIOCM_DTR; 1882ab4382d2SGreg Kroah-Hartman 1883ab4382d2SGreg Kroah-Hartman port->ops->set_termios(port, &termios, &dummy); 1884ab4382d2SGreg Kroah-Hartman /* 1885ab4382d2SGreg Kroah-Hartman * Allow the setting of the UART parameters with a NULL console 1886ab4382d2SGreg Kroah-Hartman * too: 1887ab4382d2SGreg Kroah-Hartman */ 1888ab4382d2SGreg Kroah-Hartman if (co) 1889ab4382d2SGreg Kroah-Hartman co->cflag = termios.c_cflag; 1890ab4382d2SGreg Kroah-Hartman 1891ab4382d2SGreg Kroah-Hartman return 0; 1892ab4382d2SGreg Kroah-Hartman } 1893ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_set_options); 1894ab4382d2SGreg Kroah-Hartman #endif /* CONFIG_SERIAL_CORE_CONSOLE */ 1895ab4382d2SGreg Kroah-Hartman 1896cf75525fSJiri Slaby /** 1897cf75525fSJiri Slaby * uart_change_pm - set power state of the port 1898cf75525fSJiri Slaby * 1899cf75525fSJiri Slaby * @state: port descriptor 1900cf75525fSJiri Slaby * @pm_state: new state 1901cf75525fSJiri Slaby * 1902cf75525fSJiri Slaby * Locking: port->mutex has to be held 1903cf75525fSJiri Slaby */ 19046f538fe3SLinus Walleij static void uart_change_pm(struct uart_state *state, 19056f538fe3SLinus Walleij enum uart_pm_state pm_state) 1906ab4382d2SGreg Kroah-Hartman { 1907ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 1908ab4382d2SGreg Kroah-Hartman 1909ab4382d2SGreg Kroah-Hartman if (state->pm_state != pm_state) { 1910ab4382d2SGreg Kroah-Hartman if (port->ops->pm) 1911ab4382d2SGreg Kroah-Hartman port->ops->pm(port, pm_state, state->pm_state); 1912ab4382d2SGreg Kroah-Hartman state->pm_state = pm_state; 1913ab4382d2SGreg Kroah-Hartman } 1914ab4382d2SGreg Kroah-Hartman } 1915ab4382d2SGreg Kroah-Hartman 1916ab4382d2SGreg Kroah-Hartman struct uart_match { 1917ab4382d2SGreg Kroah-Hartman struct uart_port *port; 1918ab4382d2SGreg Kroah-Hartman struct uart_driver *driver; 1919ab4382d2SGreg Kroah-Hartman }; 1920ab4382d2SGreg Kroah-Hartman 1921ab4382d2SGreg Kroah-Hartman static int serial_match_port(struct device *dev, void *data) 1922ab4382d2SGreg Kroah-Hartman { 1923ab4382d2SGreg Kroah-Hartman struct uart_match *match = data; 1924ab4382d2SGreg Kroah-Hartman struct tty_driver *tty_drv = match->driver->tty_driver; 1925ab4382d2SGreg Kroah-Hartman dev_t devt = MKDEV(tty_drv->major, tty_drv->minor_start) + 1926ab4382d2SGreg Kroah-Hartman match->port->line; 1927ab4382d2SGreg Kroah-Hartman 1928ab4382d2SGreg Kroah-Hartman return dev->devt == devt; /* Actually, only one tty per port */ 1929ab4382d2SGreg Kroah-Hartman } 1930ab4382d2SGreg Kroah-Hartman 1931ab4382d2SGreg Kroah-Hartman int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport) 1932ab4382d2SGreg Kroah-Hartman { 1933ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 1934ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1935ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 1936ab4382d2SGreg Kroah-Hartman struct uart_match match = {uport, drv}; 1937ab4382d2SGreg Kroah-Hartman 1938ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1939ab4382d2SGreg Kroah-Hartman 1940ab4382d2SGreg Kroah-Hartman tty_dev = device_find_child(uport->dev, &match, serial_match_port); 1941ab4382d2SGreg Kroah-Hartman if (device_may_wakeup(tty_dev)) { 1942ab4382d2SGreg Kroah-Hartman if (!enable_irq_wake(uport->irq)) 1943ab4382d2SGreg Kroah-Hartman uport->irq_wake = 1; 1944ab4382d2SGreg Kroah-Hartman put_device(tty_dev); 1945ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1946ab4382d2SGreg Kroah-Hartman return 0; 1947ab4382d2SGreg Kroah-Hartman } 19485a65dcc0SFederico Vaga put_device(tty_dev); 19495a65dcc0SFederico Vaga 1950ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) 1951ab4382d2SGreg Kroah-Hartman uport->suspended = 1; 1952ab4382d2SGreg Kroah-Hartman 1953ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_INITIALIZED) { 1954ab4382d2SGreg Kroah-Hartman const struct uart_ops *ops = uport->ops; 1955ab4382d2SGreg Kroah-Hartman int tries; 1956ab4382d2SGreg Kroah-Hartman 1957ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) { 1958ab4382d2SGreg Kroah-Hartman set_bit(ASYNCB_SUSPENDED, &port->flags); 1959ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_INITIALIZED, &port->flags); 1960ab4382d2SGreg Kroah-Hartman 1961ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1962ab4382d2SGreg Kroah-Hartman ops->stop_tx(uport); 1963ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, 0); 1964ab4382d2SGreg Kroah-Hartman ops->stop_rx(uport); 1965ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1966ab4382d2SGreg Kroah-Hartman } 1967ab4382d2SGreg Kroah-Hartman 1968ab4382d2SGreg Kroah-Hartman /* 1969ab4382d2SGreg Kroah-Hartman * Wait for the transmitter to empty. 1970ab4382d2SGreg Kroah-Hartman */ 1971ab4382d2SGreg Kroah-Hartman for (tries = 3; !ops->tx_empty(uport) && tries; tries--) 1972ab4382d2SGreg Kroah-Hartman msleep(10); 1973ab4382d2SGreg Kroah-Hartman if (!tries) 19742f2dafe7SSudip Mukherjee dev_err(uport->dev, "%s%d: Unable to drain transmitter\n", 1975ab4382d2SGreg Kroah-Hartman drv->dev_name, 1976ab4382d2SGreg Kroah-Hartman drv->tty_driver->name_base + uport->line); 1977ab4382d2SGreg Kroah-Hartman 1978ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) 1979ab4382d2SGreg Kroah-Hartman ops->shutdown(uport); 1980ab4382d2SGreg Kroah-Hartman } 1981ab4382d2SGreg Kroah-Hartman 1982ab4382d2SGreg Kroah-Hartman /* 1983ab4382d2SGreg Kroah-Hartman * Disable the console device before suspending. 1984ab4382d2SGreg Kroah-Hartman */ 1985ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled && uart_console(uport)) 1986ab4382d2SGreg Kroah-Hartman console_stop(uport->cons); 1987ab4382d2SGreg Kroah-Hartman 1988ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) 19896f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_OFF); 1990ab4382d2SGreg Kroah-Hartman 1991ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1992ab4382d2SGreg Kroah-Hartman 1993ab4382d2SGreg Kroah-Hartman return 0; 1994ab4382d2SGreg Kroah-Hartman } 1995ab4382d2SGreg Kroah-Hartman 1996ab4382d2SGreg Kroah-Hartman int uart_resume_port(struct uart_driver *drv, struct uart_port *uport) 1997ab4382d2SGreg Kroah-Hartman { 1998ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 1999ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2000ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 2001ab4382d2SGreg Kroah-Hartman struct uart_match match = {uport, drv}; 2002ab4382d2SGreg Kroah-Hartman struct ktermios termios; 2003ab4382d2SGreg Kroah-Hartman 2004ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2005ab4382d2SGreg Kroah-Hartman 2006ab4382d2SGreg Kroah-Hartman tty_dev = device_find_child(uport->dev, &match, serial_match_port); 2007ab4382d2SGreg Kroah-Hartman if (!uport->suspended && device_may_wakeup(tty_dev)) { 2008ab4382d2SGreg Kroah-Hartman if (uport->irq_wake) { 2009ab4382d2SGreg Kroah-Hartman disable_irq_wake(uport->irq); 2010ab4382d2SGreg Kroah-Hartman uport->irq_wake = 0; 2011ab4382d2SGreg Kroah-Hartman } 20125a65dcc0SFederico Vaga put_device(tty_dev); 2013ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2014ab4382d2SGreg Kroah-Hartman return 0; 2015ab4382d2SGreg Kroah-Hartman } 20165a65dcc0SFederico Vaga put_device(tty_dev); 2017ab4382d2SGreg Kroah-Hartman uport->suspended = 0; 2018ab4382d2SGreg Kroah-Hartman 2019ab4382d2SGreg Kroah-Hartman /* 2020ab4382d2SGreg Kroah-Hartman * Re-enable the console device after suspending. 2021ab4382d2SGreg Kroah-Hartman */ 20225933a161SYin Kangkai if (uart_console(uport)) { 2023ab4382d2SGreg Kroah-Hartman /* 2024ab4382d2SGreg Kroah-Hartman * First try to use the console cflag setting. 2025ab4382d2SGreg Kroah-Hartman */ 2026ab4382d2SGreg Kroah-Hartman memset(&termios, 0, sizeof(struct ktermios)); 2027ab4382d2SGreg Kroah-Hartman termios.c_cflag = uport->cons->cflag; 2028ab4382d2SGreg Kroah-Hartman 2029ab4382d2SGreg Kroah-Hartman /* 2030ab4382d2SGreg Kroah-Hartman * If that's unset, use the tty termios setting. 2031ab4382d2SGreg Kroah-Hartman */ 2032adc8d746SAlan Cox if (port->tty && termios.c_cflag == 0) 2033adc8d746SAlan Cox termios = port->tty->termios; 2034ab4382d2SGreg Kroah-Hartman 203594abc56fSNing Jiang if (console_suspend_enabled) 20366f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2037ab4382d2SGreg Kroah-Hartman uport->ops->set_termios(uport, &termios, NULL); 20385933a161SYin Kangkai if (console_suspend_enabled) 2039ab4382d2SGreg Kroah-Hartman console_start(uport->cons); 2040ab4382d2SGreg Kroah-Hartman } 2041ab4382d2SGreg Kroah-Hartman 2042ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_SUSPENDED) { 2043ab4382d2SGreg Kroah-Hartman const struct uart_ops *ops = uport->ops; 2044ab4382d2SGreg Kroah-Hartman int ret; 2045ab4382d2SGreg Kroah-Hartman 20466f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2047ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 2048ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, 0); 2049ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2050ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) { 2051ab4382d2SGreg Kroah-Hartman /* Protected by port mutex for now */ 2052ab4382d2SGreg Kroah-Hartman struct tty_struct *tty = port->tty; 2053ab4382d2SGreg Kroah-Hartman ret = ops->startup(uport); 2054ab4382d2SGreg Kroah-Hartman if (ret == 0) { 2055ab4382d2SGreg Kroah-Hartman if (tty) 2056ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 2057ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 2058ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, uport->mctrl); 2059ab4382d2SGreg Kroah-Hartman ops->start_tx(uport); 2060ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2061ab4382d2SGreg Kroah-Hartman set_bit(ASYNCB_INITIALIZED, &port->flags); 2062ab4382d2SGreg Kroah-Hartman } else { 2063ab4382d2SGreg Kroah-Hartman /* 2064ab4382d2SGreg Kroah-Hartman * Failed to resume - maybe hardware went away? 2065ab4382d2SGreg Kroah-Hartman * Clear the "initialized" flag so we won't try 2066ab4382d2SGreg Kroah-Hartman * to call the low level drivers shutdown method. 2067ab4382d2SGreg Kroah-Hartman */ 2068ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 2069ab4382d2SGreg Kroah-Hartman } 2070ab4382d2SGreg Kroah-Hartman } 2071ab4382d2SGreg Kroah-Hartman 2072ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_SUSPENDED, &port->flags); 2073ab4382d2SGreg Kroah-Hartman } 2074ab4382d2SGreg Kroah-Hartman 2075ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2076ab4382d2SGreg Kroah-Hartman 2077ab4382d2SGreg Kroah-Hartman return 0; 2078ab4382d2SGreg Kroah-Hartman } 2079ab4382d2SGreg Kroah-Hartman 2080ab4382d2SGreg Kroah-Hartman static inline void 2081ab4382d2SGreg Kroah-Hartman uart_report_port(struct uart_driver *drv, struct uart_port *port) 2082ab4382d2SGreg Kroah-Hartman { 2083ab4382d2SGreg Kroah-Hartman char address[64]; 2084ab4382d2SGreg Kroah-Hartman 2085ab4382d2SGreg Kroah-Hartman switch (port->iotype) { 2086ab4382d2SGreg Kroah-Hartman case UPIO_PORT: 2087ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), "I/O 0x%lx", port->iobase); 2088ab4382d2SGreg Kroah-Hartman break; 2089ab4382d2SGreg Kroah-Hartman case UPIO_HUB6: 2090ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), 2091ab4382d2SGreg Kroah-Hartman "I/O 0x%lx offset 0x%x", port->iobase, port->hub6); 2092ab4382d2SGreg Kroah-Hartman break; 2093ab4382d2SGreg Kroah-Hartman case UPIO_MEM: 2094ab4382d2SGreg Kroah-Hartman case UPIO_MEM32: 2095ab4382d2SGreg Kroah-Hartman case UPIO_AU: 2096ab4382d2SGreg Kroah-Hartman case UPIO_TSI: 2097ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), 2098ab4382d2SGreg Kroah-Hartman "MMIO 0x%llx", (unsigned long long)port->mapbase); 2099ab4382d2SGreg Kroah-Hartman break; 2100ab4382d2SGreg Kroah-Hartman default: 2101ab4382d2SGreg Kroah-Hartman strlcpy(address, "*unknown*", sizeof(address)); 2102ab4382d2SGreg Kroah-Hartman break; 2103ab4382d2SGreg Kroah-Hartman } 2104ab4382d2SGreg Kroah-Hartman 21052f2dafe7SSudip Mukherjee dev_info(port->dev, "%s%d at %s (irq = %d, base_baud = %d) is a %s\n", 2106ab4382d2SGreg Kroah-Hartman drv->dev_name, 2107ab4382d2SGreg Kroah-Hartman drv->tty_driver->name_base + port->line, 21087d12b976SKees Cook address, port->irq, port->uartclk / 16, uart_type(port)); 2109ab4382d2SGreg Kroah-Hartman } 2110ab4382d2SGreg Kroah-Hartman 2111ab4382d2SGreg Kroah-Hartman static void 2112ab4382d2SGreg Kroah-Hartman uart_configure_port(struct uart_driver *drv, struct uart_state *state, 2113ab4382d2SGreg Kroah-Hartman struct uart_port *port) 2114ab4382d2SGreg Kroah-Hartman { 2115ab4382d2SGreg Kroah-Hartman unsigned int flags; 2116ab4382d2SGreg Kroah-Hartman 2117ab4382d2SGreg Kroah-Hartman /* 2118ab4382d2SGreg Kroah-Hartman * If there isn't a port here, don't do anything further. 2119ab4382d2SGreg Kroah-Hartman */ 2120ab4382d2SGreg Kroah-Hartman if (!port->iobase && !port->mapbase && !port->membase) 2121ab4382d2SGreg Kroah-Hartman return; 2122ab4382d2SGreg Kroah-Hartman 2123ab4382d2SGreg Kroah-Hartman /* 2124ab4382d2SGreg Kroah-Hartman * Now do the auto configuration stuff. Note that config_port 2125ab4382d2SGreg Kroah-Hartman * is expected to claim the resources and map the port for us. 2126ab4382d2SGreg Kroah-Hartman */ 2127ab4382d2SGreg Kroah-Hartman flags = 0; 2128ab4382d2SGreg Kroah-Hartman if (port->flags & UPF_AUTO_IRQ) 2129ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_IRQ; 2130ab4382d2SGreg Kroah-Hartman if (port->flags & UPF_BOOT_AUTOCONF) { 2131ab4382d2SGreg Kroah-Hartman if (!(port->flags & UPF_FIXED_TYPE)) { 2132ab4382d2SGreg Kroah-Hartman port->type = PORT_UNKNOWN; 2133ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_TYPE; 2134ab4382d2SGreg Kroah-Hartman } 2135ab4382d2SGreg Kroah-Hartman port->ops->config_port(port, flags); 2136ab4382d2SGreg Kroah-Hartman } 2137ab4382d2SGreg Kroah-Hartman 2138ab4382d2SGreg Kroah-Hartman if (port->type != PORT_UNKNOWN) { 2139ab4382d2SGreg Kroah-Hartman unsigned long flags; 2140ab4382d2SGreg Kroah-Hartman 2141ab4382d2SGreg Kroah-Hartman uart_report_port(drv, port); 2142ab4382d2SGreg Kroah-Hartman 2143ab4382d2SGreg Kroah-Hartman /* Power up port for set_mctrl() */ 21446f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2145ab4382d2SGreg Kroah-Hartman 2146ab4382d2SGreg Kroah-Hartman /* 2147ab4382d2SGreg Kroah-Hartman * Ensure that the modem control lines are de-activated. 2148ab4382d2SGreg Kroah-Hartman * keep the DTR setting that is set in uart_set_options() 2149ab4382d2SGreg Kroah-Hartman * We probably don't need a spinlock around this, but 2150ab4382d2SGreg Kroah-Hartman */ 2151ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 2152ab4382d2SGreg Kroah-Hartman port->ops->set_mctrl(port, port->mctrl & TIOCM_DTR); 2153ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 2154ab4382d2SGreg Kroah-Hartman 2155ab4382d2SGreg Kroah-Hartman /* 2156ab4382d2SGreg Kroah-Hartman * If this driver supports console, and it hasn't been 2157ab4382d2SGreg Kroah-Hartman * successfully registered yet, try to re-register it. 2158ab4382d2SGreg Kroah-Hartman * It may be that the port was not available. 2159ab4382d2SGreg Kroah-Hartman */ 2160ab4382d2SGreg Kroah-Hartman if (port->cons && !(port->cons->flags & CON_ENABLED)) 2161ab4382d2SGreg Kroah-Hartman register_console(port->cons); 2162ab4382d2SGreg Kroah-Hartman 2163ab4382d2SGreg Kroah-Hartman /* 2164ab4382d2SGreg Kroah-Hartman * Power down all ports by default, except the 2165ab4382d2SGreg Kroah-Hartman * console if we have one. 2166ab4382d2SGreg Kroah-Hartman */ 2167ab4382d2SGreg Kroah-Hartman if (!uart_console(port)) 21686f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_OFF); 2169ab4382d2SGreg Kroah-Hartman } 2170ab4382d2SGreg Kroah-Hartman } 2171ab4382d2SGreg Kroah-Hartman 2172ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 2173ab4382d2SGreg Kroah-Hartman 2174ab4382d2SGreg Kroah-Hartman static int uart_poll_init(struct tty_driver *driver, int line, char *options) 2175ab4382d2SGreg Kroah-Hartman { 2176ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2177ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2178ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2179ab4382d2SGreg Kroah-Hartman int baud = 9600; 2180ab4382d2SGreg Kroah-Hartman int bits = 8; 2181ab4382d2SGreg Kroah-Hartman int parity = 'n'; 2182ab4382d2SGreg Kroah-Hartman int flow = 'n'; 2183c7f3e708SAnton Vorontsov int ret; 2184ab4382d2SGreg Kroah-Hartman 2185ab4382d2SGreg Kroah-Hartman if (!state || !state->uart_port) 2186ab4382d2SGreg Kroah-Hartman return -1; 2187ab4382d2SGreg Kroah-Hartman 2188ab4382d2SGreg Kroah-Hartman port = state->uart_port; 2189ab4382d2SGreg Kroah-Hartman if (!(port->ops->poll_get_char && port->ops->poll_put_char)) 2190ab4382d2SGreg Kroah-Hartman return -1; 2191ab4382d2SGreg Kroah-Hartman 2192c7f3e708SAnton Vorontsov if (port->ops->poll_init) { 2193c7f3e708SAnton Vorontsov struct tty_port *tport = &state->port; 2194c7f3e708SAnton Vorontsov 2195c7f3e708SAnton Vorontsov ret = 0; 2196c7f3e708SAnton Vorontsov mutex_lock(&tport->mutex); 2197c7f3e708SAnton Vorontsov /* 2198c7f3e708SAnton Vorontsov * We don't set ASYNCB_INITIALIZED as we only initialized the 2199c7f3e708SAnton Vorontsov * hw, e.g. state->xmit is still uninitialized. 2200c7f3e708SAnton Vorontsov */ 2201c7f3e708SAnton Vorontsov if (!test_bit(ASYNCB_INITIALIZED, &tport->flags)) 2202c7f3e708SAnton Vorontsov ret = port->ops->poll_init(port); 2203c7f3e708SAnton Vorontsov mutex_unlock(&tport->mutex); 2204c7f3e708SAnton Vorontsov if (ret) 2205c7f3e708SAnton Vorontsov return ret; 2206c7f3e708SAnton Vorontsov } 2207c7f3e708SAnton Vorontsov 2208ab4382d2SGreg Kroah-Hartman if (options) { 2209ab4382d2SGreg Kroah-Hartman uart_parse_options(options, &baud, &parity, &bits, &flow); 2210ab4382d2SGreg Kroah-Hartman return uart_set_options(port, NULL, baud, parity, bits, flow); 2211ab4382d2SGreg Kroah-Hartman } 2212ab4382d2SGreg Kroah-Hartman 2213ab4382d2SGreg Kroah-Hartman return 0; 2214ab4382d2SGreg Kroah-Hartman } 2215ab4382d2SGreg Kroah-Hartman 2216ab4382d2SGreg Kroah-Hartman static int uart_poll_get_char(struct tty_driver *driver, int line) 2217ab4382d2SGreg Kroah-Hartman { 2218ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2219ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2220ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2221ab4382d2SGreg Kroah-Hartman 2222ab4382d2SGreg Kroah-Hartman if (!state || !state->uart_port) 2223ab4382d2SGreg Kroah-Hartman return -1; 2224ab4382d2SGreg Kroah-Hartman 2225ab4382d2SGreg Kroah-Hartman port = state->uart_port; 2226ab4382d2SGreg Kroah-Hartman return port->ops->poll_get_char(port); 2227ab4382d2SGreg Kroah-Hartman } 2228ab4382d2SGreg Kroah-Hartman 2229ab4382d2SGreg Kroah-Hartman static void uart_poll_put_char(struct tty_driver *driver, int line, char ch) 2230ab4382d2SGreg Kroah-Hartman { 2231ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2232ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2233ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2234ab4382d2SGreg Kroah-Hartman 2235ab4382d2SGreg Kroah-Hartman if (!state || !state->uart_port) 2236ab4382d2SGreg Kroah-Hartman return; 2237ab4382d2SGreg Kroah-Hartman 2238ab4382d2SGreg Kroah-Hartman port = state->uart_port; 2239c7d44a02SDoug Anderson 2240c7d44a02SDoug Anderson if (ch == '\n') 2241c7d44a02SDoug Anderson port->ops->poll_put_char(port, '\r'); 2242ab4382d2SGreg Kroah-Hartman port->ops->poll_put_char(port, ch); 2243ab4382d2SGreg Kroah-Hartman } 2244ab4382d2SGreg Kroah-Hartman #endif 2245ab4382d2SGreg Kroah-Hartman 2246ab4382d2SGreg Kroah-Hartman static const struct tty_operations uart_ops = { 2247ab4382d2SGreg Kroah-Hartman .open = uart_open, 2248ab4382d2SGreg Kroah-Hartman .close = uart_close, 2249ab4382d2SGreg Kroah-Hartman .write = uart_write, 2250ab4382d2SGreg Kroah-Hartman .put_char = uart_put_char, 2251ab4382d2SGreg Kroah-Hartman .flush_chars = uart_flush_chars, 2252ab4382d2SGreg Kroah-Hartman .write_room = uart_write_room, 2253ab4382d2SGreg Kroah-Hartman .chars_in_buffer= uart_chars_in_buffer, 2254ab4382d2SGreg Kroah-Hartman .flush_buffer = uart_flush_buffer, 2255ab4382d2SGreg Kroah-Hartman .ioctl = uart_ioctl, 2256ab4382d2SGreg Kroah-Hartman .throttle = uart_throttle, 2257ab4382d2SGreg Kroah-Hartman .unthrottle = uart_unthrottle, 2258ab4382d2SGreg Kroah-Hartman .send_xchar = uart_send_xchar, 2259ab4382d2SGreg Kroah-Hartman .set_termios = uart_set_termios, 2260ab4382d2SGreg Kroah-Hartman .set_ldisc = uart_set_ldisc, 2261ab4382d2SGreg Kroah-Hartman .stop = uart_stop, 2262ab4382d2SGreg Kroah-Hartman .start = uart_start, 2263ab4382d2SGreg Kroah-Hartman .hangup = uart_hangup, 2264ab4382d2SGreg Kroah-Hartman .break_ctl = uart_break_ctl, 2265ab4382d2SGreg Kroah-Hartman .wait_until_sent= uart_wait_until_sent, 2266ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_PROC_FS 2267ab4382d2SGreg Kroah-Hartman .proc_fops = &uart_proc_fops, 2268ab4382d2SGreg Kroah-Hartman #endif 2269ab4382d2SGreg Kroah-Hartman .tiocmget = uart_tiocmget, 2270ab4382d2SGreg Kroah-Hartman .tiocmset = uart_tiocmset, 2271ab4382d2SGreg Kroah-Hartman .get_icount = uart_get_icount, 2272ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 2273ab4382d2SGreg Kroah-Hartman .poll_init = uart_poll_init, 2274ab4382d2SGreg Kroah-Hartman .poll_get_char = uart_poll_get_char, 2275ab4382d2SGreg Kroah-Hartman .poll_put_char = uart_poll_put_char, 2276ab4382d2SGreg Kroah-Hartman #endif 2277ab4382d2SGreg Kroah-Hartman }; 2278ab4382d2SGreg Kroah-Hartman 2279ab4382d2SGreg Kroah-Hartman static const struct tty_port_operations uart_port_ops = { 22800b1db830SJiri Slaby .activate = uart_port_activate, 22810b1db830SJiri Slaby .shutdown = uart_port_shutdown, 2282ab4382d2SGreg Kroah-Hartman .carrier_raised = uart_carrier_raised, 2283ab4382d2SGreg Kroah-Hartman .dtr_rts = uart_dtr_rts, 2284ab4382d2SGreg Kroah-Hartman }; 2285ab4382d2SGreg Kroah-Hartman 2286ab4382d2SGreg Kroah-Hartman /** 2287ab4382d2SGreg Kroah-Hartman * uart_register_driver - register a driver with the uart core layer 2288ab4382d2SGreg Kroah-Hartman * @drv: low level driver structure 2289ab4382d2SGreg Kroah-Hartman * 2290ab4382d2SGreg Kroah-Hartman * Register a uart driver with the core driver. We in turn register 2291ab4382d2SGreg Kroah-Hartman * with the tty layer, and initialise the core driver per-port state. 2292ab4382d2SGreg Kroah-Hartman * 2293ab4382d2SGreg Kroah-Hartman * We have a proc file in /proc/tty/driver which is named after the 2294ab4382d2SGreg Kroah-Hartman * normal driver. 2295ab4382d2SGreg Kroah-Hartman * 2296ab4382d2SGreg Kroah-Hartman * drv->port should be NULL, and the per-port structures should be 2297ab4382d2SGreg Kroah-Hartman * registered using uart_add_one_port after this call has succeeded. 2298ab4382d2SGreg Kroah-Hartman */ 2299ab4382d2SGreg Kroah-Hartman int uart_register_driver(struct uart_driver *drv) 2300ab4382d2SGreg Kroah-Hartman { 2301ab4382d2SGreg Kroah-Hartman struct tty_driver *normal; 2302ab4382d2SGreg Kroah-Hartman int i, retval; 2303ab4382d2SGreg Kroah-Hartman 2304ab4382d2SGreg Kroah-Hartman BUG_ON(drv->state); 2305ab4382d2SGreg Kroah-Hartman 2306ab4382d2SGreg Kroah-Hartman /* 2307ab4382d2SGreg Kroah-Hartman * Maybe we should be using a slab cache for this, especially if 2308ab4382d2SGreg Kroah-Hartman * we have a large number of ports to handle. 2309ab4382d2SGreg Kroah-Hartman */ 2310ab4382d2SGreg Kroah-Hartman drv->state = kzalloc(sizeof(struct uart_state) * drv->nr, GFP_KERNEL); 2311ab4382d2SGreg Kroah-Hartman if (!drv->state) 2312ab4382d2SGreg Kroah-Hartman goto out; 2313ab4382d2SGreg Kroah-Hartman 2314ab4382d2SGreg Kroah-Hartman normal = alloc_tty_driver(drv->nr); 2315ab4382d2SGreg Kroah-Hartman if (!normal) 2316ab4382d2SGreg Kroah-Hartman goto out_kfree; 2317ab4382d2SGreg Kroah-Hartman 2318ab4382d2SGreg Kroah-Hartman drv->tty_driver = normal; 2319ab4382d2SGreg Kroah-Hartman 2320ab4382d2SGreg Kroah-Hartman normal->driver_name = drv->driver_name; 2321ab4382d2SGreg Kroah-Hartman normal->name = drv->dev_name; 2322ab4382d2SGreg Kroah-Hartman normal->major = drv->major; 2323ab4382d2SGreg Kroah-Hartman normal->minor_start = drv->minor; 2324ab4382d2SGreg Kroah-Hartman normal->type = TTY_DRIVER_TYPE_SERIAL; 2325ab4382d2SGreg Kroah-Hartman normal->subtype = SERIAL_TYPE_NORMAL; 2326ab4382d2SGreg Kroah-Hartman normal->init_termios = tty_std_termios; 2327ab4382d2SGreg Kroah-Hartman normal->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; 2328ab4382d2SGreg Kroah-Hartman normal->init_termios.c_ispeed = normal->init_termios.c_ospeed = 9600; 2329ab4382d2SGreg Kroah-Hartman normal->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; 2330ab4382d2SGreg Kroah-Hartman normal->driver_state = drv; 2331ab4382d2SGreg Kroah-Hartman tty_set_operations(normal, &uart_ops); 2332ab4382d2SGreg Kroah-Hartman 2333ab4382d2SGreg Kroah-Hartman /* 2334ab4382d2SGreg Kroah-Hartman * Initialise the UART state(s). 2335ab4382d2SGreg Kroah-Hartman */ 2336ab4382d2SGreg Kroah-Hartman for (i = 0; i < drv->nr; i++) { 2337ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + i; 2338ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2339ab4382d2SGreg Kroah-Hartman 2340ab4382d2SGreg Kroah-Hartman tty_port_init(port); 2341ab4382d2SGreg Kroah-Hartman port->ops = &uart_port_ops; 23424cb0fbfdSJiri Slaby port->close_delay = HZ / 2; /* .5 seconds */ 23434cb0fbfdSJiri Slaby port->closing_wait = 30 * HZ;/* 30 seconds */ 2344ab4382d2SGreg Kroah-Hartman } 2345ab4382d2SGreg Kroah-Hartman 2346ab4382d2SGreg Kroah-Hartman retval = tty_register_driver(normal); 2347ab4382d2SGreg Kroah-Hartman if (retval >= 0) 2348ab4382d2SGreg Kroah-Hartman return retval; 2349ab4382d2SGreg Kroah-Hartman 2350191c5f10SJiri Slaby for (i = 0; i < drv->nr; i++) 2351191c5f10SJiri Slaby tty_port_destroy(&drv->state[i].port); 2352ab4382d2SGreg Kroah-Hartman put_tty_driver(normal); 2353ab4382d2SGreg Kroah-Hartman out_kfree: 2354ab4382d2SGreg Kroah-Hartman kfree(drv->state); 2355ab4382d2SGreg Kroah-Hartman out: 2356ab4382d2SGreg Kroah-Hartman return -ENOMEM; 2357ab4382d2SGreg Kroah-Hartman } 2358ab4382d2SGreg Kroah-Hartman 2359ab4382d2SGreg Kroah-Hartman /** 2360ab4382d2SGreg Kroah-Hartman * uart_unregister_driver - remove a driver from the uart core layer 2361ab4382d2SGreg Kroah-Hartman * @drv: low level driver structure 2362ab4382d2SGreg Kroah-Hartman * 2363ab4382d2SGreg Kroah-Hartman * Remove all references to a driver from the core driver. The low 2364ab4382d2SGreg Kroah-Hartman * level driver must have removed all its ports via the 2365ab4382d2SGreg Kroah-Hartman * uart_remove_one_port() if it registered them with uart_add_one_port(). 2366ab4382d2SGreg Kroah-Hartman * (ie, drv->port == NULL) 2367ab4382d2SGreg Kroah-Hartman */ 2368ab4382d2SGreg Kroah-Hartman void uart_unregister_driver(struct uart_driver *drv) 2369ab4382d2SGreg Kroah-Hartman { 2370ab4382d2SGreg Kroah-Hartman struct tty_driver *p = drv->tty_driver; 2371191c5f10SJiri Slaby unsigned int i; 2372191c5f10SJiri Slaby 2373ab4382d2SGreg Kroah-Hartman tty_unregister_driver(p); 2374ab4382d2SGreg Kroah-Hartman put_tty_driver(p); 2375191c5f10SJiri Slaby for (i = 0; i < drv->nr; i++) 2376191c5f10SJiri Slaby tty_port_destroy(&drv->state[i].port); 2377ab4382d2SGreg Kroah-Hartman kfree(drv->state); 23781e66cdedSAlan Cox drv->state = NULL; 2379ab4382d2SGreg Kroah-Hartman drv->tty_driver = NULL; 2380ab4382d2SGreg Kroah-Hartman } 2381ab4382d2SGreg Kroah-Hartman 2382ab4382d2SGreg Kroah-Hartman struct tty_driver *uart_console_device(struct console *co, int *index) 2383ab4382d2SGreg Kroah-Hartman { 2384ab4382d2SGreg Kroah-Hartman struct uart_driver *p = co->data; 2385ab4382d2SGreg Kroah-Hartman *index = co->index; 2386ab4382d2SGreg Kroah-Hartman return p->tty_driver; 2387ab4382d2SGreg Kroah-Hartman } 2388ab4382d2SGreg Kroah-Hartman 23896915c0e4STomas Hlavacek static ssize_t uart_get_attr_uartclk(struct device *dev, 23906915c0e4STomas Hlavacek struct device_attribute *attr, char *buf) 23916915c0e4STomas Hlavacek { 2392bebe73e3SAlan Cox struct serial_struct tmp; 23936915c0e4STomas Hlavacek struct tty_port *port = dev_get_drvdata(dev); 2394b1b79916STomas Hlavacek 23959f109694SAlan Cox uart_get_info(port, &tmp); 2396bebe73e3SAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.baud_base * 16); 23976915c0e4STomas Hlavacek } 23986915c0e4STomas Hlavacek 2399373bac4cSAlan Cox static ssize_t uart_get_attr_type(struct device *dev, 2400373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2401373bac4cSAlan Cox { 2402373bac4cSAlan Cox struct serial_struct tmp; 2403373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2404373bac4cSAlan Cox 2405373bac4cSAlan Cox uart_get_info(port, &tmp); 2406373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.type); 2407373bac4cSAlan Cox } 2408373bac4cSAlan Cox static ssize_t uart_get_attr_line(struct device *dev, 2409373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2410373bac4cSAlan Cox { 2411373bac4cSAlan Cox struct serial_struct tmp; 2412373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2413373bac4cSAlan Cox 2414373bac4cSAlan Cox uart_get_info(port, &tmp); 2415373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.line); 2416373bac4cSAlan Cox } 2417373bac4cSAlan Cox 2418373bac4cSAlan Cox static ssize_t uart_get_attr_port(struct device *dev, 2419373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2420373bac4cSAlan Cox { 2421373bac4cSAlan Cox struct serial_struct tmp; 2422373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2423fd985e1dSAndrew Morton unsigned long ioaddr; 2424373bac4cSAlan Cox 2425373bac4cSAlan Cox uart_get_info(port, &tmp); 2426fd985e1dSAndrew Morton ioaddr = tmp.port; 2427fd985e1dSAndrew Morton if (HIGH_BITS_OFFSET) 2428fd985e1dSAndrew Morton ioaddr |= (unsigned long)tmp.port_high << HIGH_BITS_OFFSET; 2429fd985e1dSAndrew Morton return snprintf(buf, PAGE_SIZE, "0x%lX\n", ioaddr); 2430373bac4cSAlan Cox } 2431373bac4cSAlan Cox 2432373bac4cSAlan Cox static ssize_t uart_get_attr_irq(struct device *dev, 2433373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2434373bac4cSAlan Cox { 2435373bac4cSAlan Cox struct serial_struct tmp; 2436373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2437373bac4cSAlan Cox 2438373bac4cSAlan Cox uart_get_info(port, &tmp); 2439373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.irq); 2440373bac4cSAlan Cox } 2441373bac4cSAlan Cox 2442373bac4cSAlan Cox static ssize_t uart_get_attr_flags(struct device *dev, 2443373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2444373bac4cSAlan Cox { 2445373bac4cSAlan Cox struct serial_struct tmp; 2446373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2447373bac4cSAlan Cox 2448373bac4cSAlan Cox uart_get_info(port, &tmp); 2449373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "0x%X\n", tmp.flags); 2450373bac4cSAlan Cox } 2451373bac4cSAlan Cox 2452373bac4cSAlan Cox static ssize_t uart_get_attr_xmit_fifo_size(struct device *dev, 2453373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2454373bac4cSAlan Cox { 2455373bac4cSAlan Cox struct serial_struct tmp; 2456373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2457373bac4cSAlan Cox 2458373bac4cSAlan Cox uart_get_info(port, &tmp); 2459373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.xmit_fifo_size); 2460373bac4cSAlan Cox } 2461373bac4cSAlan Cox 2462373bac4cSAlan Cox 2463373bac4cSAlan Cox static ssize_t uart_get_attr_close_delay(struct device *dev, 2464373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2465373bac4cSAlan Cox { 2466373bac4cSAlan Cox struct serial_struct tmp; 2467373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2468373bac4cSAlan Cox 2469373bac4cSAlan Cox uart_get_info(port, &tmp); 2470373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.close_delay); 2471373bac4cSAlan Cox } 2472373bac4cSAlan Cox 2473373bac4cSAlan Cox 2474373bac4cSAlan Cox static ssize_t uart_get_attr_closing_wait(struct device *dev, 2475373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2476373bac4cSAlan Cox { 2477373bac4cSAlan Cox struct serial_struct tmp; 2478373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2479373bac4cSAlan Cox 2480373bac4cSAlan Cox uart_get_info(port, &tmp); 2481373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.closing_wait); 2482373bac4cSAlan Cox } 2483373bac4cSAlan Cox 2484373bac4cSAlan Cox static ssize_t uart_get_attr_custom_divisor(struct device *dev, 2485373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2486373bac4cSAlan Cox { 2487373bac4cSAlan Cox struct serial_struct tmp; 2488373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2489373bac4cSAlan Cox 2490373bac4cSAlan Cox uart_get_info(port, &tmp); 2491373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.custom_divisor); 2492373bac4cSAlan Cox } 2493373bac4cSAlan Cox 2494373bac4cSAlan Cox static ssize_t uart_get_attr_io_type(struct device *dev, 2495373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2496373bac4cSAlan Cox { 2497373bac4cSAlan Cox struct serial_struct tmp; 2498373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2499373bac4cSAlan Cox 2500373bac4cSAlan Cox uart_get_info(port, &tmp); 2501373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.io_type); 2502373bac4cSAlan Cox } 2503373bac4cSAlan Cox 2504373bac4cSAlan Cox static ssize_t uart_get_attr_iomem_base(struct device *dev, 2505373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2506373bac4cSAlan Cox { 2507373bac4cSAlan Cox struct serial_struct tmp; 2508373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2509373bac4cSAlan Cox 2510373bac4cSAlan Cox uart_get_info(port, &tmp); 2511373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "0x%lX\n", (unsigned long)tmp.iomem_base); 2512373bac4cSAlan Cox } 2513373bac4cSAlan Cox 2514373bac4cSAlan Cox static ssize_t uart_get_attr_iomem_reg_shift(struct device *dev, 2515373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2516373bac4cSAlan Cox { 2517373bac4cSAlan Cox struct serial_struct tmp; 2518373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2519373bac4cSAlan Cox 2520373bac4cSAlan Cox uart_get_info(port, &tmp); 2521373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.iomem_reg_shift); 2522373bac4cSAlan Cox } 2523373bac4cSAlan Cox 2524373bac4cSAlan Cox static DEVICE_ATTR(type, S_IRUSR | S_IRGRP, uart_get_attr_type, NULL); 2525373bac4cSAlan Cox static DEVICE_ATTR(line, S_IRUSR | S_IRGRP, uart_get_attr_line, NULL); 2526373bac4cSAlan Cox static DEVICE_ATTR(port, S_IRUSR | S_IRGRP, uart_get_attr_port, NULL); 2527373bac4cSAlan Cox static DEVICE_ATTR(irq, S_IRUSR | S_IRGRP, uart_get_attr_irq, NULL); 2528373bac4cSAlan Cox static DEVICE_ATTR(flags, S_IRUSR | S_IRGRP, uart_get_attr_flags, NULL); 2529373bac4cSAlan Cox static DEVICE_ATTR(xmit_fifo_size, S_IRUSR | S_IRGRP, uart_get_attr_xmit_fifo_size, NULL); 25306915c0e4STomas Hlavacek static DEVICE_ATTR(uartclk, S_IRUSR | S_IRGRP, uart_get_attr_uartclk, NULL); 2531373bac4cSAlan Cox static DEVICE_ATTR(close_delay, S_IRUSR | S_IRGRP, uart_get_attr_close_delay, NULL); 2532373bac4cSAlan Cox static DEVICE_ATTR(closing_wait, S_IRUSR | S_IRGRP, uart_get_attr_closing_wait, NULL); 2533373bac4cSAlan Cox static DEVICE_ATTR(custom_divisor, S_IRUSR | S_IRGRP, uart_get_attr_custom_divisor, NULL); 2534373bac4cSAlan Cox static DEVICE_ATTR(io_type, S_IRUSR | S_IRGRP, uart_get_attr_io_type, NULL); 2535373bac4cSAlan Cox static DEVICE_ATTR(iomem_base, S_IRUSR | S_IRGRP, uart_get_attr_iomem_base, NULL); 2536373bac4cSAlan Cox static DEVICE_ATTR(iomem_reg_shift, S_IRUSR | S_IRGRP, uart_get_attr_iomem_reg_shift, NULL); 25376915c0e4STomas Hlavacek 25386915c0e4STomas Hlavacek static struct attribute *tty_dev_attrs[] = { 2539373bac4cSAlan Cox &dev_attr_type.attr, 2540373bac4cSAlan Cox &dev_attr_line.attr, 2541373bac4cSAlan Cox &dev_attr_port.attr, 2542373bac4cSAlan Cox &dev_attr_irq.attr, 2543373bac4cSAlan Cox &dev_attr_flags.attr, 2544373bac4cSAlan Cox &dev_attr_xmit_fifo_size.attr, 25456915c0e4STomas Hlavacek &dev_attr_uartclk.attr, 2546373bac4cSAlan Cox &dev_attr_close_delay.attr, 2547373bac4cSAlan Cox &dev_attr_closing_wait.attr, 2548373bac4cSAlan Cox &dev_attr_custom_divisor.attr, 2549373bac4cSAlan Cox &dev_attr_io_type.attr, 2550373bac4cSAlan Cox &dev_attr_iomem_base.attr, 2551373bac4cSAlan Cox &dev_attr_iomem_reg_shift.attr, 25526915c0e4STomas Hlavacek NULL, 25536915c0e4STomas Hlavacek }; 25546915c0e4STomas Hlavacek 2555b1b79916STomas Hlavacek static const struct attribute_group tty_dev_attr_group = { 25566915c0e4STomas Hlavacek .attrs = tty_dev_attrs, 25576915c0e4STomas Hlavacek }; 25586915c0e4STomas Hlavacek 2559ab4382d2SGreg Kroah-Hartman /** 2560ab4382d2SGreg Kroah-Hartman * uart_add_one_port - attach a driver-defined port structure 2561ab4382d2SGreg Kroah-Hartman * @drv: pointer to the uart low level driver structure for this port 2562ab4382d2SGreg Kroah-Hartman * @uport: uart port structure to use for this port. 2563ab4382d2SGreg Kroah-Hartman * 2564ab4382d2SGreg Kroah-Hartman * This allows the driver to register its own uart_port structure 2565ab4382d2SGreg Kroah-Hartman * with the core driver. The main purpose is to allow the low 2566ab4382d2SGreg Kroah-Hartman * level uart drivers to expand uart_port, rather than having yet 2567ab4382d2SGreg Kroah-Hartman * more levels of structures. 2568ab4382d2SGreg Kroah-Hartman */ 2569ab4382d2SGreg Kroah-Hartman int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport) 2570ab4382d2SGreg Kroah-Hartman { 2571ab4382d2SGreg Kroah-Hartman struct uart_state *state; 2572ab4382d2SGreg Kroah-Hartman struct tty_port *port; 2573ab4382d2SGreg Kroah-Hartman int ret = 0; 2574ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 2575266dcff0SGreg Kroah-Hartman int num_groups; 2576ab4382d2SGreg Kroah-Hartman 2577ab4382d2SGreg Kroah-Hartman BUG_ON(in_interrupt()); 2578ab4382d2SGreg Kroah-Hartman 2579ab4382d2SGreg Kroah-Hartman if (uport->line >= drv->nr) 2580ab4382d2SGreg Kroah-Hartman return -EINVAL; 2581ab4382d2SGreg Kroah-Hartman 2582ab4382d2SGreg Kroah-Hartman state = drv->state + uport->line; 2583ab4382d2SGreg Kroah-Hartman port = &state->port; 2584ab4382d2SGreg Kroah-Hartman 2585ab4382d2SGreg Kroah-Hartman mutex_lock(&port_mutex); 2586ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2587ab4382d2SGreg Kroah-Hartman if (state->uart_port) { 2588ab4382d2SGreg Kroah-Hartman ret = -EINVAL; 2589ab4382d2SGreg Kroah-Hartman goto out; 2590ab4382d2SGreg Kroah-Hartman } 2591ab4382d2SGreg Kroah-Hartman 2592ab4382d2SGreg Kroah-Hartman state->uart_port = uport; 25936f538fe3SLinus Walleij state->pm_state = UART_PM_STATE_UNDEFINED; 2594ab4382d2SGreg Kroah-Hartman 2595ab4382d2SGreg Kroah-Hartman uport->cons = drv->cons; 2596ab4382d2SGreg Kroah-Hartman uport->state = state; 2597ab4382d2SGreg Kroah-Hartman 2598ab4382d2SGreg Kroah-Hartman /* 2599ab4382d2SGreg Kroah-Hartman * If this port is a console, then the spinlock is already 2600ab4382d2SGreg Kroah-Hartman * initialised. 2601ab4382d2SGreg Kroah-Hartman */ 2602ab4382d2SGreg Kroah-Hartman if (!(uart_console(uport) && (uport->cons->flags & CON_ENABLED))) { 2603ab4382d2SGreg Kroah-Hartman spin_lock_init(&uport->lock); 2604ab4382d2SGreg Kroah-Hartman lockdep_set_class(&uport->lock, &port_lock_key); 2605ab4382d2SGreg Kroah-Hartman } 2606a208ffd2SGrant Likely if (uport->cons && uport->dev) 2607a208ffd2SGrant Likely of_console_check(uport->dev->of_node, uport->cons->name, uport->line); 2608ab4382d2SGreg Kroah-Hartman 2609ab4382d2SGreg Kroah-Hartman uart_configure_port(drv, state, uport); 2610ab4382d2SGreg Kroah-Hartman 2611266dcff0SGreg Kroah-Hartman num_groups = 2; 2612266dcff0SGreg Kroah-Hartman if (uport->attr_group) 2613266dcff0SGreg Kroah-Hartman num_groups++; 2614266dcff0SGreg Kroah-Hartman 2615c2b703b8SYoshihiro YUNOMAE uport->tty_groups = kcalloc(num_groups, sizeof(*uport->tty_groups), 2616266dcff0SGreg Kroah-Hartman GFP_KERNEL); 2617266dcff0SGreg Kroah-Hartman if (!uport->tty_groups) { 2618266dcff0SGreg Kroah-Hartman ret = -ENOMEM; 2619266dcff0SGreg Kroah-Hartman goto out; 2620266dcff0SGreg Kroah-Hartman } 2621266dcff0SGreg Kroah-Hartman uport->tty_groups[0] = &tty_dev_attr_group; 2622266dcff0SGreg Kroah-Hartman if (uport->attr_group) 2623266dcff0SGreg Kroah-Hartman uport->tty_groups[1] = uport->attr_group; 2624266dcff0SGreg Kroah-Hartman 2625ab4382d2SGreg Kroah-Hartman /* 2626ab4382d2SGreg Kroah-Hartman * Register the port whether it's detected or not. This allows 2627015355b7SGeert Uytterhoeven * setserial to be used to alter this port's parameters. 2628ab4382d2SGreg Kroah-Hartman */ 2629b1b79916STomas Hlavacek tty_dev = tty_port_register_device_attr(port, drv->tty_driver, 2630266dcff0SGreg Kroah-Hartman uport->line, uport->dev, port, uport->tty_groups); 2631ab4382d2SGreg Kroah-Hartman if (likely(!IS_ERR(tty_dev))) { 263277359835SSimon Glass device_set_wakeup_capable(tty_dev, 1); 263377359835SSimon Glass } else { 26342f2dafe7SSudip Mukherjee dev_err(uport->dev, "Cannot register tty device on line %d\n", 2635ab4382d2SGreg Kroah-Hartman uport->line); 263677359835SSimon Glass } 2637ab4382d2SGreg Kroah-Hartman 2638ab4382d2SGreg Kroah-Hartman /* 2639ab4382d2SGreg Kroah-Hartman * Ensure UPF_DEAD is not set. 2640ab4382d2SGreg Kroah-Hartman */ 2641ab4382d2SGreg Kroah-Hartman uport->flags &= ~UPF_DEAD; 2642ab4382d2SGreg Kroah-Hartman 2643ab4382d2SGreg Kroah-Hartman out: 2644ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2645ab4382d2SGreg Kroah-Hartman mutex_unlock(&port_mutex); 2646ab4382d2SGreg Kroah-Hartman 2647ab4382d2SGreg Kroah-Hartman return ret; 2648ab4382d2SGreg Kroah-Hartman } 2649ab4382d2SGreg Kroah-Hartman 2650ab4382d2SGreg Kroah-Hartman /** 2651ab4382d2SGreg Kroah-Hartman * uart_remove_one_port - detach a driver defined port structure 2652ab4382d2SGreg Kroah-Hartman * @drv: pointer to the uart low level driver structure for this port 2653ab4382d2SGreg Kroah-Hartman * @uport: uart port structure for this port 2654ab4382d2SGreg Kroah-Hartman * 2655ab4382d2SGreg Kroah-Hartman * This unhooks (and hangs up) the specified port structure from the 2656ab4382d2SGreg Kroah-Hartman * core driver. No further calls will be made to the low-level code 2657ab4382d2SGreg Kroah-Hartman * for this port. 2658ab4382d2SGreg Kroah-Hartman */ 2659ab4382d2SGreg Kroah-Hartman int uart_remove_one_port(struct uart_driver *drv, struct uart_port *uport) 2660ab4382d2SGreg Kroah-Hartman { 2661ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 2662ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 26634c6d5b4dSGeert Uytterhoeven struct tty_struct *tty; 2664b342dd51SChen Gang int ret = 0; 2665ab4382d2SGreg Kroah-Hartman 2666ab4382d2SGreg Kroah-Hartman BUG_ON(in_interrupt()); 2667ab4382d2SGreg Kroah-Hartman 2668ab4382d2SGreg Kroah-Hartman if (state->uart_port != uport) 26692f2dafe7SSudip Mukherjee dev_alert(uport->dev, "Removing wrong port: %p != %p\n", 2670ab4382d2SGreg Kroah-Hartman state->uart_port, uport); 2671ab4382d2SGreg Kroah-Hartman 2672ab4382d2SGreg Kroah-Hartman mutex_lock(&port_mutex); 2673ab4382d2SGreg Kroah-Hartman 2674ab4382d2SGreg Kroah-Hartman /* 2675ab4382d2SGreg Kroah-Hartman * Mark the port "dead" - this prevents any opens from 2676ab4382d2SGreg Kroah-Hartman * succeeding while we shut down the port. 2677ab4382d2SGreg Kroah-Hartman */ 2678ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2679b342dd51SChen Gang if (!state->uart_port) { 2680b342dd51SChen Gang mutex_unlock(&port->mutex); 2681b342dd51SChen Gang ret = -EINVAL; 2682b342dd51SChen Gang goto out; 2683b342dd51SChen Gang } 2684ab4382d2SGreg Kroah-Hartman uport->flags |= UPF_DEAD; 2685ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2686ab4382d2SGreg Kroah-Hartman 2687ab4382d2SGreg Kroah-Hartman /* 2688ab4382d2SGreg Kroah-Hartman * Remove the devices from the tty layer 2689ab4382d2SGreg Kroah-Hartman */ 2690ab4382d2SGreg Kroah-Hartman tty_unregister_device(drv->tty_driver, uport->line); 2691ab4382d2SGreg Kroah-Hartman 26924c6d5b4dSGeert Uytterhoeven tty = tty_port_tty_get(port); 26934c6d5b4dSGeert Uytterhoeven if (tty) { 2694ab4382d2SGreg Kroah-Hartman tty_vhangup(port->tty); 26954c6d5b4dSGeert Uytterhoeven tty_kref_put(tty); 26964c6d5b4dSGeert Uytterhoeven } 2697ab4382d2SGreg Kroah-Hartman 2698ab4382d2SGreg Kroah-Hartman /* 26995f5c9ae5SGeert Uytterhoeven * If the port is used as a console, unregister it 27005f5c9ae5SGeert Uytterhoeven */ 27015f5c9ae5SGeert Uytterhoeven if (uart_console(uport)) 27025f5c9ae5SGeert Uytterhoeven unregister_console(uport->cons); 27035f5c9ae5SGeert Uytterhoeven 27045f5c9ae5SGeert Uytterhoeven /* 2705ab4382d2SGreg Kroah-Hartman * Free the port IO and memory resources, if any. 2706ab4382d2SGreg Kroah-Hartman */ 2707ab4382d2SGreg Kroah-Hartman if (uport->type != PORT_UNKNOWN) 2708ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 2709266dcff0SGreg Kroah-Hartman kfree(uport->tty_groups); 2710ab4382d2SGreg Kroah-Hartman 2711ab4382d2SGreg Kroah-Hartman /* 2712ab4382d2SGreg Kroah-Hartman * Indicate that there isn't a port here anymore. 2713ab4382d2SGreg Kroah-Hartman */ 2714ab4382d2SGreg Kroah-Hartman uport->type = PORT_UNKNOWN; 2715ab4382d2SGreg Kroah-Hartman 2716ab4382d2SGreg Kroah-Hartman state->uart_port = NULL; 2717b342dd51SChen Gang out: 2718ab4382d2SGreg Kroah-Hartman mutex_unlock(&port_mutex); 2719ab4382d2SGreg Kroah-Hartman 2720b342dd51SChen Gang return ret; 2721ab4382d2SGreg Kroah-Hartman } 2722ab4382d2SGreg Kroah-Hartman 2723ab4382d2SGreg Kroah-Hartman /* 2724ab4382d2SGreg Kroah-Hartman * Are the two ports equivalent? 2725ab4382d2SGreg Kroah-Hartman */ 2726ab4382d2SGreg Kroah-Hartman int uart_match_port(struct uart_port *port1, struct uart_port *port2) 2727ab4382d2SGreg Kroah-Hartman { 2728ab4382d2SGreg Kroah-Hartman if (port1->iotype != port2->iotype) 2729ab4382d2SGreg Kroah-Hartman return 0; 2730ab4382d2SGreg Kroah-Hartman 2731ab4382d2SGreg Kroah-Hartman switch (port1->iotype) { 2732ab4382d2SGreg Kroah-Hartman case UPIO_PORT: 2733ab4382d2SGreg Kroah-Hartman return (port1->iobase == port2->iobase); 2734ab4382d2SGreg Kroah-Hartman case UPIO_HUB6: 2735ab4382d2SGreg Kroah-Hartman return (port1->iobase == port2->iobase) && 2736ab4382d2SGreg Kroah-Hartman (port1->hub6 == port2->hub6); 2737ab4382d2SGreg Kroah-Hartman case UPIO_MEM: 2738ab4382d2SGreg Kroah-Hartman case UPIO_MEM32: 2739ab4382d2SGreg Kroah-Hartman case UPIO_AU: 2740ab4382d2SGreg Kroah-Hartman case UPIO_TSI: 2741ab4382d2SGreg Kroah-Hartman return (port1->mapbase == port2->mapbase); 2742ab4382d2SGreg Kroah-Hartman } 2743ab4382d2SGreg Kroah-Hartman return 0; 2744ab4382d2SGreg Kroah-Hartman } 2745ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_match_port); 2746ab4382d2SGreg Kroah-Hartman 2747027d7dacSJiri Slaby /** 2748027d7dacSJiri Slaby * uart_handle_dcd_change - handle a change of carrier detect state 2749027d7dacSJiri Slaby * @uport: uart_port structure for the open port 2750027d7dacSJiri Slaby * @status: new carrier detect status, nonzero if active 2751027d7dacSJiri Slaby */ 2752027d7dacSJiri Slaby void uart_handle_dcd_change(struct uart_port *uport, unsigned int status) 2753027d7dacSJiri Slaby { 275442381572SGeorge Spelvin struct tty_port *port = &uport->state->port; 275543eca0aeSAlan Cox struct tty_struct *tty = port->tty; 275642381572SGeorge Spelvin struct tty_ldisc *ld = tty ? tty_ldisc_ref(tty) : NULL; 2757027d7dacSJiri Slaby 275842381572SGeorge Spelvin if (ld) { 275942381572SGeorge Spelvin if (ld->ops->dcd_change) 2760593fb1aeSGeorge Spelvin ld->ops->dcd_change(tty, status); 276142381572SGeorge Spelvin tty_ldisc_deref(ld); 276242381572SGeorge Spelvin } 2763027d7dacSJiri Slaby 2764027d7dacSJiri Slaby uport->icount.dcd++; 2765027d7dacSJiri Slaby 2766027d7dacSJiri Slaby if (port->flags & ASYNC_CHECK_CD) { 2767027d7dacSJiri Slaby if (status) 2768027d7dacSJiri Slaby wake_up_interruptible(&port->open_wait); 276943eca0aeSAlan Cox else if (tty) 277043eca0aeSAlan Cox tty_hangup(tty); 2771027d7dacSJiri Slaby } 2772027d7dacSJiri Slaby } 2773027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_handle_dcd_change); 2774027d7dacSJiri Slaby 2775027d7dacSJiri Slaby /** 2776027d7dacSJiri Slaby * uart_handle_cts_change - handle a change of clear-to-send state 2777027d7dacSJiri Slaby * @uport: uart_port structure for the open port 2778027d7dacSJiri Slaby * @status: new clear to send status, nonzero if active 2779027d7dacSJiri Slaby */ 2780027d7dacSJiri Slaby void uart_handle_cts_change(struct uart_port *uport, unsigned int status) 2781027d7dacSJiri Slaby { 2782027d7dacSJiri Slaby struct tty_port *port = &uport->state->port; 2783027d7dacSJiri Slaby struct tty_struct *tty = port->tty; 2784027d7dacSJiri Slaby 2785027d7dacSJiri Slaby uport->icount.cts++; 2786027d7dacSJiri Slaby 2787a6eec92eSPeter Hurley if (tty_port_cts_enabled(port)) { 2788027d7dacSJiri Slaby if (tty->hw_stopped) { 2789027d7dacSJiri Slaby if (status) { 2790027d7dacSJiri Slaby tty->hw_stopped = 0; 2791027d7dacSJiri Slaby uport->ops->start_tx(uport); 2792027d7dacSJiri Slaby uart_write_wakeup(uport); 2793027d7dacSJiri Slaby } 2794027d7dacSJiri Slaby } else { 2795027d7dacSJiri Slaby if (!status) { 2796027d7dacSJiri Slaby tty->hw_stopped = 1; 2797027d7dacSJiri Slaby uport->ops->stop_tx(uport); 2798027d7dacSJiri Slaby } 2799027d7dacSJiri Slaby } 2800027d7dacSJiri Slaby } 2801027d7dacSJiri Slaby } 2802027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_handle_cts_change); 2803027d7dacSJiri Slaby 2804cf75525fSJiri Slaby /** 2805cf75525fSJiri Slaby * uart_insert_char - push a char to the uart layer 2806cf75525fSJiri Slaby * 2807cf75525fSJiri Slaby * User is responsible to call tty_flip_buffer_push when they are done with 2808cf75525fSJiri Slaby * insertion. 2809cf75525fSJiri Slaby * 2810cf75525fSJiri Slaby * @port: corresponding port 2811cf75525fSJiri Slaby * @status: state of the serial port RX buffer (LSR for 8250) 2812cf75525fSJiri Slaby * @overrun: mask of overrun bits in @status 2813cf75525fSJiri Slaby * @ch: character to push 2814cf75525fSJiri Slaby * @flag: flag for the character (see TTY_NORMAL and friends) 2815cf75525fSJiri Slaby */ 2816027d7dacSJiri Slaby void uart_insert_char(struct uart_port *port, unsigned int status, 2817027d7dacSJiri Slaby unsigned int overrun, unsigned int ch, unsigned int flag) 2818027d7dacSJiri Slaby { 281992a19f9cSJiri Slaby struct tty_port *tport = &port->state->port; 2820027d7dacSJiri Slaby 2821027d7dacSJiri Slaby if ((status & port->ignore_status_mask & ~overrun) == 0) 282292a19f9cSJiri Slaby if (tty_insert_flip_char(tport, ch, flag) == 0) 2823dabfb351SCorbin ++port->icount.buf_overrun; 2824027d7dacSJiri Slaby 2825027d7dacSJiri Slaby /* 2826027d7dacSJiri Slaby * Overrun is special. Since it's reported immediately, 2827027d7dacSJiri Slaby * it doesn't affect the current character. 2828027d7dacSJiri Slaby */ 2829027d7dacSJiri Slaby if (status & ~port->ignore_status_mask & overrun) 283092a19f9cSJiri Slaby if (tty_insert_flip_char(tport, 0, TTY_OVERRUN) == 0) 2831dabfb351SCorbin ++port->icount.buf_overrun; 2832027d7dacSJiri Slaby } 2833027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_insert_char); 2834027d7dacSJiri Slaby 2835ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_write_wakeup); 2836ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_register_driver); 2837ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_unregister_driver); 2838ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_suspend_port); 2839ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_resume_port); 2840ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_add_one_port); 2841ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_remove_one_port); 2842ab4382d2SGreg Kroah-Hartman 2843ab4382d2SGreg Kroah-Hartman MODULE_DESCRIPTION("Serial driver core"); 2844ab4382d2SGreg Kroah-Hartman MODULE_LICENSE("GPL"); 2845