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> 25ab4382d2SGreg Kroah-Hartman #include <linux/slab.h> 26ab4382d2SGreg Kroah-Hartman #include <linux/init.h> 27ab4382d2SGreg Kroah-Hartman #include <linux/console.h> 28ab4382d2SGreg Kroah-Hartman #include <linux/proc_fs.h> 29ab4382d2SGreg Kroah-Hartman #include <linux/seq_file.h> 30ab4382d2SGreg Kroah-Hartman #include <linux/device.h> 31ab4382d2SGreg Kroah-Hartman #include <linux/serial.h> /* for serial_state and serial_icounter_struct */ 32ab4382d2SGreg Kroah-Hartman #include <linux/serial_core.h> 33ab4382d2SGreg Kroah-Hartman #include <linux/delay.h> 34ab4382d2SGreg Kroah-Hartman #include <linux/mutex.h> 35ab4382d2SGreg Kroah-Hartman 36ab4382d2SGreg Kroah-Hartman #include <asm/irq.h> 37ab4382d2SGreg Kroah-Hartman #include <asm/uaccess.h> 38ab4382d2SGreg Kroah-Hartman 39ab4382d2SGreg Kroah-Hartman /* 40ab4382d2SGreg Kroah-Hartman * This is used to lock changes in serial line configuration. 41ab4382d2SGreg Kroah-Hartman */ 42ab4382d2SGreg Kroah-Hartman static DEFINE_MUTEX(port_mutex); 43ab4382d2SGreg Kroah-Hartman 44ab4382d2SGreg Kroah-Hartman /* 45ab4382d2SGreg Kroah-Hartman * lockdep: port->lock is initialized in two places, but we 46ab4382d2SGreg Kroah-Hartman * want only one lock-class: 47ab4382d2SGreg Kroah-Hartman */ 48ab4382d2SGreg Kroah-Hartman static struct lock_class_key port_lock_key; 49ab4382d2SGreg Kroah-Hartman 50ab4382d2SGreg Kroah-Hartman #define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8) 51ab4382d2SGreg Kroah-Hartman 52ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_SERIAL_CORE_CONSOLE 53ab4382d2SGreg Kroah-Hartman #define uart_console(port) ((port)->cons && (port)->cons->index == (port)->line) 54ab4382d2SGreg Kroah-Hartman #else 55ab4382d2SGreg Kroah-Hartman #define uart_console(port) (0) 56ab4382d2SGreg Kroah-Hartman #endif 57ab4382d2SGreg Kroah-Hartman 58ab4382d2SGreg Kroah-Hartman static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, 59ab4382d2SGreg Kroah-Hartman struct ktermios *old_termios); 60ab4382d2SGreg Kroah-Hartman static void __uart_wait_until_sent(struct uart_port *port, int timeout); 61ab4382d2SGreg Kroah-Hartman static void uart_change_pm(struct uart_state *state, int pm_state); 62ab4382d2SGreg Kroah-Hartman 63ab4382d2SGreg Kroah-Hartman /* 64ab4382d2SGreg Kroah-Hartman * This routine is used by the interrupt handler to schedule processing in 65ab4382d2SGreg Kroah-Hartman * the software interrupt portion of the driver. 66ab4382d2SGreg Kroah-Hartman */ 67ab4382d2SGreg Kroah-Hartman void uart_write_wakeup(struct uart_port *port) 68ab4382d2SGreg Kroah-Hartman { 69ab4382d2SGreg Kroah-Hartman struct uart_state *state = port->state; 70ab4382d2SGreg Kroah-Hartman /* 71ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 72ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 73ab4382d2SGreg Kroah-Hartman */ 74ab4382d2SGreg Kroah-Hartman BUG_ON(!state); 75ab4382d2SGreg Kroah-Hartman tasklet_schedule(&state->tlet); 76ab4382d2SGreg Kroah-Hartman } 77ab4382d2SGreg Kroah-Hartman 78ab4382d2SGreg Kroah-Hartman static void uart_stop(struct tty_struct *tty) 79ab4382d2SGreg Kroah-Hartman { 80ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 81ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 82ab4382d2SGreg Kroah-Hartman unsigned long flags; 83ab4382d2SGreg Kroah-Hartman 84ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 85ab4382d2SGreg Kroah-Hartman port->ops->stop_tx(port); 86ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 87ab4382d2SGreg Kroah-Hartman } 88ab4382d2SGreg Kroah-Hartman 89ab4382d2SGreg Kroah-Hartman static void __uart_start(struct tty_struct *tty) 90ab4382d2SGreg Kroah-Hartman { 91ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 92ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 93ab4382d2SGreg Kroah-Hartman 94ab4382d2SGreg Kroah-Hartman if (!uart_circ_empty(&state->xmit) && state->xmit.buf && 95ab4382d2SGreg Kroah-Hartman !tty->stopped && !tty->hw_stopped) 96ab4382d2SGreg Kroah-Hartman port->ops->start_tx(port); 97ab4382d2SGreg Kroah-Hartman } 98ab4382d2SGreg Kroah-Hartman 99ab4382d2SGreg Kroah-Hartman static void uart_start(struct tty_struct *tty) 100ab4382d2SGreg Kroah-Hartman { 101ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 102ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 103ab4382d2SGreg Kroah-Hartman unsigned long flags; 104ab4382d2SGreg Kroah-Hartman 105ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 106ab4382d2SGreg Kroah-Hartman __uart_start(tty); 107ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 108ab4382d2SGreg Kroah-Hartman } 109ab4382d2SGreg Kroah-Hartman 110ab4382d2SGreg Kroah-Hartman static void uart_tasklet_action(unsigned long data) 111ab4382d2SGreg Kroah-Hartman { 112ab4382d2SGreg Kroah-Hartman struct uart_state *state = (struct uart_state *)data; 113ab4382d2SGreg Kroah-Hartman tty_wakeup(state->port.tty); 114ab4382d2SGreg Kroah-Hartman } 115ab4382d2SGreg Kroah-Hartman 116ab4382d2SGreg Kroah-Hartman static inline void 117ab4382d2SGreg Kroah-Hartman uart_update_mctrl(struct uart_port *port, unsigned int set, unsigned int clear) 118ab4382d2SGreg Kroah-Hartman { 119ab4382d2SGreg Kroah-Hartman unsigned long flags; 120ab4382d2SGreg Kroah-Hartman unsigned int old; 121ab4382d2SGreg Kroah-Hartman 122ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 123ab4382d2SGreg Kroah-Hartman old = port->mctrl; 124ab4382d2SGreg Kroah-Hartman port->mctrl = (old & ~clear) | set; 125ab4382d2SGreg Kroah-Hartman if (old != port->mctrl) 126ab4382d2SGreg Kroah-Hartman port->ops->set_mctrl(port, port->mctrl); 127ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 128ab4382d2SGreg Kroah-Hartman } 129ab4382d2SGreg Kroah-Hartman 130ab4382d2SGreg Kroah-Hartman #define uart_set_mctrl(port, set) uart_update_mctrl(port, set, 0) 131ab4382d2SGreg Kroah-Hartman #define uart_clear_mctrl(port, clear) uart_update_mctrl(port, 0, clear) 132ab4382d2SGreg Kroah-Hartman 133ab4382d2SGreg Kroah-Hartman /* 134ab4382d2SGreg Kroah-Hartman * Startup the port. This will be called once per open. All calls 135ab4382d2SGreg Kroah-Hartman * will be serialised by the per-port mutex. 136ab4382d2SGreg Kroah-Hartman */ 137ab4382d2SGreg Kroah-Hartman static int uart_startup(struct tty_struct *tty, struct uart_state *state, int init_hw) 138ab4382d2SGreg Kroah-Hartman { 139ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 140ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 141ab4382d2SGreg Kroah-Hartman unsigned long page; 142ab4382d2SGreg Kroah-Hartman int retval = 0; 143ab4382d2SGreg Kroah-Hartman 144ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_INITIALIZED) 145ab4382d2SGreg Kroah-Hartman return 0; 146ab4382d2SGreg Kroah-Hartman 147ab4382d2SGreg Kroah-Hartman /* 148ab4382d2SGreg Kroah-Hartman * Set the TTY IO error marker - we will only clear this 149ab4382d2SGreg Kroah-Hartman * once we have successfully opened the port. Also set 150ab4382d2SGreg Kroah-Hartman * up the tty->alt_speed kludge 151ab4382d2SGreg Kroah-Hartman */ 152ab4382d2SGreg Kroah-Hartman set_bit(TTY_IO_ERROR, &tty->flags); 153ab4382d2SGreg Kroah-Hartman 154ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) 155ab4382d2SGreg Kroah-Hartman return 0; 156ab4382d2SGreg Kroah-Hartman 157ab4382d2SGreg Kroah-Hartman /* 158ab4382d2SGreg Kroah-Hartman * Initialise and allocate the transmit and temporary 159ab4382d2SGreg Kroah-Hartman * buffer. 160ab4382d2SGreg Kroah-Hartman */ 161ab4382d2SGreg Kroah-Hartman if (!state->xmit.buf) { 162ab4382d2SGreg Kroah-Hartman /* This is protected by the per port mutex */ 163ab4382d2SGreg Kroah-Hartman page = get_zeroed_page(GFP_KERNEL); 164ab4382d2SGreg Kroah-Hartman if (!page) 165ab4382d2SGreg Kroah-Hartman return -ENOMEM; 166ab4382d2SGreg Kroah-Hartman 167ab4382d2SGreg Kroah-Hartman state->xmit.buf = (unsigned char *) page; 168ab4382d2SGreg Kroah-Hartman uart_circ_clear(&state->xmit); 169ab4382d2SGreg Kroah-Hartman } 170ab4382d2SGreg Kroah-Hartman 171ab4382d2SGreg Kroah-Hartman retval = uport->ops->startup(uport); 172ab4382d2SGreg Kroah-Hartman if (retval == 0) { 173c7d7abffSJiri Slaby if (uart_console(uport) && uport->cons->cflag) { 174c7d7abffSJiri Slaby tty->termios->c_cflag = uport->cons->cflag; 175c7d7abffSJiri Slaby uport->cons->cflag = 0; 176c7d7abffSJiri Slaby } 177ab4382d2SGreg Kroah-Hartman /* 178ab4382d2SGreg Kroah-Hartman * Initialise the hardware port settings. 179ab4382d2SGreg Kroah-Hartman */ 180ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 181ab4382d2SGreg Kroah-Hartman 182c7d7abffSJiri Slaby if (init_hw) { 183ab4382d2SGreg Kroah-Hartman /* 184ab4382d2SGreg Kroah-Hartman * Setup the RTS and DTR signals once the 185ab4382d2SGreg Kroah-Hartman * port is open and ready to respond. 186ab4382d2SGreg Kroah-Hartman */ 187ab4382d2SGreg Kroah-Hartman if (tty->termios->c_cflag & CBAUD) 188ab4382d2SGreg Kroah-Hartman uart_set_mctrl(uport, TIOCM_RTS | TIOCM_DTR); 189ab4382d2SGreg Kroah-Hartman } 190ab4382d2SGreg Kroah-Hartman 191ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_CTS_FLOW) { 192ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 193ab4382d2SGreg Kroah-Hartman if (!(uport->ops->get_mctrl(uport) & TIOCM_CTS)) 194ab4382d2SGreg Kroah-Hartman tty->hw_stopped = 1; 195ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 196ab4382d2SGreg Kroah-Hartman } 197ab4382d2SGreg Kroah-Hartman 198ab4382d2SGreg Kroah-Hartman set_bit(ASYNCB_INITIALIZED, &port->flags); 199ab4382d2SGreg Kroah-Hartman 200ab4382d2SGreg Kroah-Hartman clear_bit(TTY_IO_ERROR, &tty->flags); 201ab4382d2SGreg Kroah-Hartman } 202ab4382d2SGreg Kroah-Hartman 2030055197eSJiri Slaby /* 2040055197eSJiri Slaby * This is to allow setserial on this port. People may want to set 2050055197eSJiri Slaby * port/irq/type and then reconfigure the port properly if it failed 2060055197eSJiri Slaby * now. 2070055197eSJiri Slaby */ 208ab4382d2SGreg Kroah-Hartman if (retval && capable(CAP_SYS_ADMIN)) 209ab4382d2SGreg Kroah-Hartman retval = 0; 210ab4382d2SGreg Kroah-Hartman 211ab4382d2SGreg Kroah-Hartman return retval; 212ab4382d2SGreg Kroah-Hartman } 213ab4382d2SGreg Kroah-Hartman 214ab4382d2SGreg Kroah-Hartman /* 215ab4382d2SGreg Kroah-Hartman * This routine will shutdown a serial port; interrupts are disabled, and 216ab4382d2SGreg Kroah-Hartman * DTR is dropped if the hangup on close termio flag is on. Calls to 217ab4382d2SGreg Kroah-Hartman * uart_shutdown are serialised by the per-port semaphore. 218ab4382d2SGreg Kroah-Hartman */ 219ab4382d2SGreg Kroah-Hartman static void uart_shutdown(struct tty_struct *tty, struct uart_state *state) 220ab4382d2SGreg Kroah-Hartman { 221ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 222ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 223ab4382d2SGreg Kroah-Hartman 224ab4382d2SGreg Kroah-Hartman /* 225ab4382d2SGreg Kroah-Hartman * Set the TTY IO error marker 226ab4382d2SGreg Kroah-Hartman */ 227ab4382d2SGreg Kroah-Hartman if (tty) 228ab4382d2SGreg Kroah-Hartman set_bit(TTY_IO_ERROR, &tty->flags); 229ab4382d2SGreg Kroah-Hartman 230ab4382d2SGreg Kroah-Hartman if (test_and_clear_bit(ASYNCB_INITIALIZED, &port->flags)) { 231ab4382d2SGreg Kroah-Hartman /* 232ab4382d2SGreg Kroah-Hartman * Turn off DTR and RTS early. 233ab4382d2SGreg Kroah-Hartman */ 234ab4382d2SGreg Kroah-Hartman if (!tty || (tty->termios->c_cflag & HUPCL)) 235ab4382d2SGreg Kroah-Hartman uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); 236ab4382d2SGreg Kroah-Hartman 237ab4382d2SGreg Kroah-Hartman /* 238ab4382d2SGreg Kroah-Hartman * clear delta_msr_wait queue to avoid mem leaks: we may free 239ab4382d2SGreg Kroah-Hartman * the irq here so the queue might never be woken up. Note 240ab4382d2SGreg Kroah-Hartman * that we won't end up waiting on delta_msr_wait again since 241ab4382d2SGreg Kroah-Hartman * any outstanding file descriptors should be pointing at 242ab4382d2SGreg Kroah-Hartman * hung_up_tty_fops now. 243ab4382d2SGreg Kroah-Hartman */ 244ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->delta_msr_wait); 245ab4382d2SGreg Kroah-Hartman 246ab4382d2SGreg Kroah-Hartman /* 247ab4382d2SGreg Kroah-Hartman * Free the IRQ and disable the port. 248ab4382d2SGreg Kroah-Hartman */ 249ab4382d2SGreg Kroah-Hartman uport->ops->shutdown(uport); 250ab4382d2SGreg Kroah-Hartman 251ab4382d2SGreg Kroah-Hartman /* 252ab4382d2SGreg Kroah-Hartman * Ensure that the IRQ handler isn't running on another CPU. 253ab4382d2SGreg Kroah-Hartman */ 254ab4382d2SGreg Kroah-Hartman synchronize_irq(uport->irq); 255ab4382d2SGreg Kroah-Hartman } 256ab4382d2SGreg Kroah-Hartman 257ab4382d2SGreg Kroah-Hartman /* 258ab4382d2SGreg Kroah-Hartman * kill off our tasklet 259ab4382d2SGreg Kroah-Hartman */ 260ab4382d2SGreg Kroah-Hartman tasklet_kill(&state->tlet); 261ab4382d2SGreg Kroah-Hartman 262ab4382d2SGreg Kroah-Hartman /* 263ab4382d2SGreg Kroah-Hartman * Free the transmit buffer page. 264ab4382d2SGreg Kroah-Hartman */ 265ab4382d2SGreg Kroah-Hartman if (state->xmit.buf) { 266ab4382d2SGreg Kroah-Hartman free_page((unsigned long)state->xmit.buf); 267ab4382d2SGreg Kroah-Hartman state->xmit.buf = NULL; 268ab4382d2SGreg Kroah-Hartman } 269ab4382d2SGreg Kroah-Hartman } 270ab4382d2SGreg Kroah-Hartman 271ab4382d2SGreg Kroah-Hartman /** 272ab4382d2SGreg Kroah-Hartman * uart_update_timeout - update per-port FIFO timeout. 273ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port 274ab4382d2SGreg Kroah-Hartman * @cflag: termios cflag value 275ab4382d2SGreg Kroah-Hartman * @baud: speed of the port 276ab4382d2SGreg Kroah-Hartman * 277ab4382d2SGreg Kroah-Hartman * Set the port FIFO timeout value. The @cflag value should 278ab4382d2SGreg Kroah-Hartman * reflect the actual hardware settings. 279ab4382d2SGreg Kroah-Hartman */ 280ab4382d2SGreg Kroah-Hartman void 281ab4382d2SGreg Kroah-Hartman uart_update_timeout(struct uart_port *port, unsigned int cflag, 282ab4382d2SGreg Kroah-Hartman unsigned int baud) 283ab4382d2SGreg Kroah-Hartman { 284ab4382d2SGreg Kroah-Hartman unsigned int bits; 285ab4382d2SGreg Kroah-Hartman 286ab4382d2SGreg Kroah-Hartman /* byte size and parity */ 287ab4382d2SGreg Kroah-Hartman switch (cflag & CSIZE) { 288ab4382d2SGreg Kroah-Hartman case CS5: 289ab4382d2SGreg Kroah-Hartman bits = 7; 290ab4382d2SGreg Kroah-Hartman break; 291ab4382d2SGreg Kroah-Hartman case CS6: 292ab4382d2SGreg Kroah-Hartman bits = 8; 293ab4382d2SGreg Kroah-Hartman break; 294ab4382d2SGreg Kroah-Hartman case CS7: 295ab4382d2SGreg Kroah-Hartman bits = 9; 296ab4382d2SGreg Kroah-Hartman break; 297ab4382d2SGreg Kroah-Hartman default: 298ab4382d2SGreg Kroah-Hartman bits = 10; 299ab4382d2SGreg Kroah-Hartman break; /* CS8 */ 300ab4382d2SGreg Kroah-Hartman } 301ab4382d2SGreg Kroah-Hartman 302ab4382d2SGreg Kroah-Hartman if (cflag & CSTOPB) 303ab4382d2SGreg Kroah-Hartman bits++; 304ab4382d2SGreg Kroah-Hartman if (cflag & PARENB) 305ab4382d2SGreg Kroah-Hartman bits++; 306ab4382d2SGreg Kroah-Hartman 307ab4382d2SGreg Kroah-Hartman /* 308ab4382d2SGreg Kroah-Hartman * The total number of bits to be transmitted in the fifo. 309ab4382d2SGreg Kroah-Hartman */ 310ab4382d2SGreg Kroah-Hartman bits = bits * port->fifosize; 311ab4382d2SGreg Kroah-Hartman 312ab4382d2SGreg Kroah-Hartman /* 313ab4382d2SGreg Kroah-Hartman * Figure the timeout to send the above number of bits. 314ab4382d2SGreg Kroah-Hartman * Add .02 seconds of slop 315ab4382d2SGreg Kroah-Hartman */ 316ab4382d2SGreg Kroah-Hartman port->timeout = (HZ * bits) / baud + HZ/50; 317ab4382d2SGreg Kroah-Hartman } 318ab4382d2SGreg Kroah-Hartman 319ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_update_timeout); 320ab4382d2SGreg Kroah-Hartman 321ab4382d2SGreg Kroah-Hartman /** 322ab4382d2SGreg Kroah-Hartman * uart_get_baud_rate - return baud rate for a particular port 323ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port in question. 324ab4382d2SGreg Kroah-Hartman * @termios: desired termios settings. 325ab4382d2SGreg Kroah-Hartman * @old: old termios (or NULL) 326ab4382d2SGreg Kroah-Hartman * @min: minimum acceptable baud rate 327ab4382d2SGreg Kroah-Hartman * @max: maximum acceptable baud rate 328ab4382d2SGreg Kroah-Hartman * 329ab4382d2SGreg Kroah-Hartman * Decode the termios structure into a numeric baud rate, 330ab4382d2SGreg Kroah-Hartman * taking account of the magic 38400 baud rate (with spd_* 331ab4382d2SGreg Kroah-Hartman * flags), and mapping the %B0 rate to 9600 baud. 332ab4382d2SGreg Kroah-Hartman * 333ab4382d2SGreg Kroah-Hartman * If the new baud rate is invalid, try the old termios setting. 334ab4382d2SGreg Kroah-Hartman * If it's still invalid, we try 9600 baud. 335ab4382d2SGreg Kroah-Hartman * 336ab4382d2SGreg Kroah-Hartman * Update the @termios structure to reflect the baud rate 337ab4382d2SGreg Kroah-Hartman * we're actually going to be using. Don't do this for the case 338ab4382d2SGreg Kroah-Hartman * where B0 is requested ("hang up"). 339ab4382d2SGreg Kroah-Hartman */ 340ab4382d2SGreg Kroah-Hartman unsigned int 341ab4382d2SGreg Kroah-Hartman uart_get_baud_rate(struct uart_port *port, struct ktermios *termios, 342ab4382d2SGreg Kroah-Hartman struct ktermios *old, unsigned int min, unsigned int max) 343ab4382d2SGreg Kroah-Hartman { 344ab4382d2SGreg Kroah-Hartman unsigned int try, baud, altbaud = 38400; 345ab4382d2SGreg Kroah-Hartman int hung_up = 0; 346ab4382d2SGreg Kroah-Hartman upf_t flags = port->flags & UPF_SPD_MASK; 347ab4382d2SGreg Kroah-Hartman 348ab4382d2SGreg Kroah-Hartman if (flags == UPF_SPD_HI) 349ab4382d2SGreg Kroah-Hartman altbaud = 57600; 350ab4382d2SGreg Kroah-Hartman else if (flags == UPF_SPD_VHI) 351ab4382d2SGreg Kroah-Hartman altbaud = 115200; 352ab4382d2SGreg Kroah-Hartman else if (flags == UPF_SPD_SHI) 353ab4382d2SGreg Kroah-Hartman altbaud = 230400; 354ab4382d2SGreg Kroah-Hartman else if (flags == UPF_SPD_WARP) 355ab4382d2SGreg Kroah-Hartman altbaud = 460800; 356ab4382d2SGreg Kroah-Hartman 357ab4382d2SGreg Kroah-Hartman for (try = 0; try < 2; try++) { 358ab4382d2SGreg Kroah-Hartman baud = tty_termios_baud_rate(termios); 359ab4382d2SGreg Kroah-Hartman 360ab4382d2SGreg Kroah-Hartman /* 361ab4382d2SGreg Kroah-Hartman * The spd_hi, spd_vhi, spd_shi, spd_warp kludge... 362ab4382d2SGreg Kroah-Hartman * Die! Die! Die! 363ab4382d2SGreg Kroah-Hartman */ 364ab4382d2SGreg Kroah-Hartman if (baud == 38400) 365ab4382d2SGreg Kroah-Hartman baud = altbaud; 366ab4382d2SGreg Kroah-Hartman 367ab4382d2SGreg Kroah-Hartman /* 368ab4382d2SGreg Kroah-Hartman * Special case: B0 rate. 369ab4382d2SGreg Kroah-Hartman */ 370ab4382d2SGreg Kroah-Hartman if (baud == 0) { 371ab4382d2SGreg Kroah-Hartman hung_up = 1; 372ab4382d2SGreg Kroah-Hartman baud = 9600; 373ab4382d2SGreg Kroah-Hartman } 374ab4382d2SGreg Kroah-Hartman 375ab4382d2SGreg Kroah-Hartman if (baud >= min && baud <= max) 376ab4382d2SGreg Kroah-Hartman return baud; 377ab4382d2SGreg Kroah-Hartman 378ab4382d2SGreg Kroah-Hartman /* 379ab4382d2SGreg Kroah-Hartman * Oops, the quotient was zero. Try again with 380ab4382d2SGreg Kroah-Hartman * the old baud rate if possible. 381ab4382d2SGreg Kroah-Hartman */ 382ab4382d2SGreg Kroah-Hartman termios->c_cflag &= ~CBAUD; 383ab4382d2SGreg Kroah-Hartman if (old) { 384ab4382d2SGreg Kroah-Hartman baud = tty_termios_baud_rate(old); 385ab4382d2SGreg Kroah-Hartman if (!hung_up) 386ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 387ab4382d2SGreg Kroah-Hartman baud, baud); 388ab4382d2SGreg Kroah-Hartman old = NULL; 389ab4382d2SGreg Kroah-Hartman continue; 390ab4382d2SGreg Kroah-Hartman } 391ab4382d2SGreg Kroah-Hartman 392ab4382d2SGreg Kroah-Hartman /* 393ab4382d2SGreg Kroah-Hartman * As a last resort, if the range cannot be met then clip to 394ab4382d2SGreg Kroah-Hartman * the nearest chip supported rate. 395ab4382d2SGreg Kroah-Hartman */ 396ab4382d2SGreg Kroah-Hartman if (!hung_up) { 397ab4382d2SGreg Kroah-Hartman if (baud <= min) 398ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 399ab4382d2SGreg Kroah-Hartman min + 1, min + 1); 400ab4382d2SGreg Kroah-Hartman else 401ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 402ab4382d2SGreg Kroah-Hartman max - 1, max - 1); 403ab4382d2SGreg Kroah-Hartman } 404ab4382d2SGreg Kroah-Hartman } 405ab4382d2SGreg Kroah-Hartman /* Should never happen */ 406ab4382d2SGreg Kroah-Hartman WARN_ON(1); 407ab4382d2SGreg Kroah-Hartman return 0; 408ab4382d2SGreg Kroah-Hartman } 409ab4382d2SGreg Kroah-Hartman 410ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_get_baud_rate); 411ab4382d2SGreg Kroah-Hartman 412ab4382d2SGreg Kroah-Hartman /** 413ab4382d2SGreg Kroah-Hartman * uart_get_divisor - return uart clock divisor 414ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port. 415ab4382d2SGreg Kroah-Hartman * @baud: desired baud rate 416ab4382d2SGreg Kroah-Hartman * 417ab4382d2SGreg Kroah-Hartman * Calculate the uart clock divisor for the port. 418ab4382d2SGreg Kroah-Hartman */ 419ab4382d2SGreg Kroah-Hartman unsigned int 420ab4382d2SGreg Kroah-Hartman uart_get_divisor(struct uart_port *port, unsigned int baud) 421ab4382d2SGreg Kroah-Hartman { 422ab4382d2SGreg Kroah-Hartman unsigned int quot; 423ab4382d2SGreg Kroah-Hartman 424ab4382d2SGreg Kroah-Hartman /* 425ab4382d2SGreg Kroah-Hartman * Old custom speed handling. 426ab4382d2SGreg Kroah-Hartman */ 427ab4382d2SGreg Kroah-Hartman if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) 428ab4382d2SGreg Kroah-Hartman quot = port->custom_divisor; 429ab4382d2SGreg Kroah-Hartman else 430ab4382d2SGreg Kroah-Hartman quot = (port->uartclk + (8 * baud)) / (16 * baud); 431ab4382d2SGreg Kroah-Hartman 432ab4382d2SGreg Kroah-Hartman return quot; 433ab4382d2SGreg Kroah-Hartman } 434ab4382d2SGreg Kroah-Hartman 435ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_get_divisor); 436ab4382d2SGreg Kroah-Hartman 437ab4382d2SGreg Kroah-Hartman /* FIXME: Consistent locking policy */ 438ab4382d2SGreg Kroah-Hartman static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, 439ab4382d2SGreg Kroah-Hartman struct ktermios *old_termios) 440ab4382d2SGreg Kroah-Hartman { 441ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 442ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 443ab4382d2SGreg Kroah-Hartman struct ktermios *termios; 444ab4382d2SGreg Kroah-Hartman 445ab4382d2SGreg Kroah-Hartman /* 446ab4382d2SGreg Kroah-Hartman * If we have no tty, termios, or the port does not exist, 447ab4382d2SGreg Kroah-Hartman * then we can't set the parameters for this port. 448ab4382d2SGreg Kroah-Hartman */ 449ab4382d2SGreg Kroah-Hartman if (!tty || !tty->termios || uport->type == PORT_UNKNOWN) 450ab4382d2SGreg Kroah-Hartman return; 451ab4382d2SGreg Kroah-Hartman 452ab4382d2SGreg Kroah-Hartman termios = tty->termios; 453ab4382d2SGreg Kroah-Hartman 454ab4382d2SGreg Kroah-Hartman /* 455ab4382d2SGreg Kroah-Hartman * Set flags based on termios cflag 456ab4382d2SGreg Kroah-Hartman */ 457ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CRTSCTS) 458ab4382d2SGreg Kroah-Hartman set_bit(ASYNCB_CTS_FLOW, &port->flags); 459ab4382d2SGreg Kroah-Hartman else 460ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_CTS_FLOW, &port->flags); 461ab4382d2SGreg Kroah-Hartman 462ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CLOCAL) 463ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_CHECK_CD, &port->flags); 464ab4382d2SGreg Kroah-Hartman else 465ab4382d2SGreg Kroah-Hartman set_bit(ASYNCB_CHECK_CD, &port->flags); 466ab4382d2SGreg Kroah-Hartman 467ab4382d2SGreg Kroah-Hartman uport->ops->set_termios(uport, termios, old_termios); 468ab4382d2SGreg Kroah-Hartman } 469ab4382d2SGreg Kroah-Hartman 470ab4382d2SGreg Kroah-Hartman static inline int __uart_put_char(struct uart_port *port, 471ab4382d2SGreg Kroah-Hartman struct circ_buf *circ, unsigned char c) 472ab4382d2SGreg Kroah-Hartman { 473ab4382d2SGreg Kroah-Hartman unsigned long flags; 474ab4382d2SGreg Kroah-Hartman int ret = 0; 475ab4382d2SGreg Kroah-Hartman 476ab4382d2SGreg Kroah-Hartman if (!circ->buf) 477ab4382d2SGreg Kroah-Hartman return 0; 478ab4382d2SGreg Kroah-Hartman 479ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 480ab4382d2SGreg Kroah-Hartman if (uart_circ_chars_free(circ) != 0) { 481ab4382d2SGreg Kroah-Hartman circ->buf[circ->head] = c; 482ab4382d2SGreg Kroah-Hartman circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1); 483ab4382d2SGreg Kroah-Hartman ret = 1; 484ab4382d2SGreg Kroah-Hartman } 485ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 486ab4382d2SGreg Kroah-Hartman return ret; 487ab4382d2SGreg Kroah-Hartman } 488ab4382d2SGreg Kroah-Hartman 489ab4382d2SGreg Kroah-Hartman static int uart_put_char(struct tty_struct *tty, unsigned char ch) 490ab4382d2SGreg Kroah-Hartman { 491ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 492ab4382d2SGreg Kroah-Hartman 493ab4382d2SGreg Kroah-Hartman return __uart_put_char(state->uart_port, &state->xmit, ch); 494ab4382d2SGreg Kroah-Hartman } 495ab4382d2SGreg Kroah-Hartman 496ab4382d2SGreg Kroah-Hartman static void uart_flush_chars(struct tty_struct *tty) 497ab4382d2SGreg Kroah-Hartman { 498ab4382d2SGreg Kroah-Hartman uart_start(tty); 499ab4382d2SGreg Kroah-Hartman } 500ab4382d2SGreg Kroah-Hartman 501ab4382d2SGreg Kroah-Hartman static int uart_write(struct tty_struct *tty, 502ab4382d2SGreg Kroah-Hartman const unsigned char *buf, int count) 503ab4382d2SGreg Kroah-Hartman { 504ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 505ab4382d2SGreg Kroah-Hartman struct uart_port *port; 506ab4382d2SGreg Kroah-Hartman struct circ_buf *circ; 507ab4382d2SGreg Kroah-Hartman unsigned long flags; 508ab4382d2SGreg Kroah-Hartman int c, ret = 0; 509ab4382d2SGreg Kroah-Hartman 510ab4382d2SGreg Kroah-Hartman /* 511ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 512ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 513ab4382d2SGreg Kroah-Hartman */ 514ab4382d2SGreg Kroah-Hartman if (!state) { 515ab4382d2SGreg Kroah-Hartman WARN_ON(1); 516ab4382d2SGreg Kroah-Hartman return -EL3HLT; 517ab4382d2SGreg Kroah-Hartman } 518ab4382d2SGreg Kroah-Hartman 519ab4382d2SGreg Kroah-Hartman port = state->uart_port; 520ab4382d2SGreg Kroah-Hartman circ = &state->xmit; 521ab4382d2SGreg Kroah-Hartman 522ab4382d2SGreg Kroah-Hartman if (!circ->buf) 523ab4382d2SGreg Kroah-Hartman return 0; 524ab4382d2SGreg Kroah-Hartman 525ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 526ab4382d2SGreg Kroah-Hartman while (1) { 527ab4382d2SGreg Kroah-Hartman c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE); 528ab4382d2SGreg Kroah-Hartman if (count < c) 529ab4382d2SGreg Kroah-Hartman c = count; 530ab4382d2SGreg Kroah-Hartman if (c <= 0) 531ab4382d2SGreg Kroah-Hartman break; 532ab4382d2SGreg Kroah-Hartman memcpy(circ->buf + circ->head, buf, c); 533ab4382d2SGreg Kroah-Hartman circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1); 534ab4382d2SGreg Kroah-Hartman buf += c; 535ab4382d2SGreg Kroah-Hartman count -= c; 536ab4382d2SGreg Kroah-Hartman ret += c; 537ab4382d2SGreg Kroah-Hartman } 538ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 539ab4382d2SGreg Kroah-Hartman 540ab4382d2SGreg Kroah-Hartman uart_start(tty); 541ab4382d2SGreg Kroah-Hartman return ret; 542ab4382d2SGreg Kroah-Hartman } 543ab4382d2SGreg Kroah-Hartman 544ab4382d2SGreg Kroah-Hartman static int uart_write_room(struct tty_struct *tty) 545ab4382d2SGreg Kroah-Hartman { 546ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 547ab4382d2SGreg Kroah-Hartman unsigned long flags; 548ab4382d2SGreg Kroah-Hartman int ret; 549ab4382d2SGreg Kroah-Hartman 550ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&state->uart_port->lock, flags); 551ab4382d2SGreg Kroah-Hartman ret = uart_circ_chars_free(&state->xmit); 552ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&state->uart_port->lock, flags); 553ab4382d2SGreg Kroah-Hartman return ret; 554ab4382d2SGreg Kroah-Hartman } 555ab4382d2SGreg Kroah-Hartman 556ab4382d2SGreg Kroah-Hartman static int uart_chars_in_buffer(struct tty_struct *tty) 557ab4382d2SGreg Kroah-Hartman { 558ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 559ab4382d2SGreg Kroah-Hartman unsigned long flags; 560ab4382d2SGreg Kroah-Hartman int ret; 561ab4382d2SGreg Kroah-Hartman 562ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&state->uart_port->lock, flags); 563ab4382d2SGreg Kroah-Hartman ret = uart_circ_chars_pending(&state->xmit); 564ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&state->uart_port->lock, flags); 565ab4382d2SGreg Kroah-Hartman return ret; 566ab4382d2SGreg Kroah-Hartman } 567ab4382d2SGreg Kroah-Hartman 568ab4382d2SGreg Kroah-Hartman static void uart_flush_buffer(struct tty_struct *tty) 569ab4382d2SGreg Kroah-Hartman { 570ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 571ab4382d2SGreg Kroah-Hartman struct uart_port *port; 572ab4382d2SGreg Kroah-Hartman unsigned long flags; 573ab4382d2SGreg Kroah-Hartman 574ab4382d2SGreg Kroah-Hartman /* 575ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 576ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 577ab4382d2SGreg Kroah-Hartman */ 578ab4382d2SGreg Kroah-Hartman if (!state) { 579ab4382d2SGreg Kroah-Hartman WARN_ON(1); 580ab4382d2SGreg Kroah-Hartman return; 581ab4382d2SGreg Kroah-Hartman } 582ab4382d2SGreg Kroah-Hartman 583ab4382d2SGreg Kroah-Hartman port = state->uart_port; 584ab4382d2SGreg Kroah-Hartman pr_debug("uart_flush_buffer(%d) called\n", tty->index); 585ab4382d2SGreg Kroah-Hartman 586ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 587ab4382d2SGreg Kroah-Hartman uart_circ_clear(&state->xmit); 588ab4382d2SGreg Kroah-Hartman if (port->ops->flush_buffer) 589ab4382d2SGreg Kroah-Hartman port->ops->flush_buffer(port); 590ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 591ab4382d2SGreg Kroah-Hartman tty_wakeup(tty); 592ab4382d2SGreg Kroah-Hartman } 593ab4382d2SGreg Kroah-Hartman 594ab4382d2SGreg Kroah-Hartman /* 595ab4382d2SGreg Kroah-Hartman * This function is used to send a high-priority XON/XOFF character to 596ab4382d2SGreg Kroah-Hartman * the device 597ab4382d2SGreg Kroah-Hartman */ 598ab4382d2SGreg Kroah-Hartman static void uart_send_xchar(struct tty_struct *tty, char ch) 599ab4382d2SGreg Kroah-Hartman { 600ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 601ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 602ab4382d2SGreg Kroah-Hartman unsigned long flags; 603ab4382d2SGreg Kroah-Hartman 604ab4382d2SGreg Kroah-Hartman if (port->ops->send_xchar) 605ab4382d2SGreg Kroah-Hartman port->ops->send_xchar(port, ch); 606ab4382d2SGreg Kroah-Hartman else { 607ab4382d2SGreg Kroah-Hartman port->x_char = ch; 608ab4382d2SGreg Kroah-Hartman if (ch) { 609ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 610ab4382d2SGreg Kroah-Hartman port->ops->start_tx(port); 611ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 612ab4382d2SGreg Kroah-Hartman } 613ab4382d2SGreg Kroah-Hartman } 614ab4382d2SGreg Kroah-Hartman } 615ab4382d2SGreg Kroah-Hartman 616ab4382d2SGreg Kroah-Hartman static void uart_throttle(struct tty_struct *tty) 617ab4382d2SGreg Kroah-Hartman { 618ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 619ab4382d2SGreg Kroah-Hartman 620ab4382d2SGreg Kroah-Hartman if (I_IXOFF(tty)) 621ab4382d2SGreg Kroah-Hartman uart_send_xchar(tty, STOP_CHAR(tty)); 622ab4382d2SGreg Kroah-Hartman 623ab4382d2SGreg Kroah-Hartman if (tty->termios->c_cflag & CRTSCTS) 624ab4382d2SGreg Kroah-Hartman uart_clear_mctrl(state->uart_port, TIOCM_RTS); 625ab4382d2SGreg Kroah-Hartman } 626ab4382d2SGreg Kroah-Hartman 627ab4382d2SGreg Kroah-Hartman static void uart_unthrottle(struct tty_struct *tty) 628ab4382d2SGreg Kroah-Hartman { 629ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 630ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 631ab4382d2SGreg Kroah-Hartman 632ab4382d2SGreg Kroah-Hartman if (I_IXOFF(tty)) { 633ab4382d2SGreg Kroah-Hartman if (port->x_char) 634ab4382d2SGreg Kroah-Hartman port->x_char = 0; 635ab4382d2SGreg Kroah-Hartman else 636ab4382d2SGreg Kroah-Hartman uart_send_xchar(tty, START_CHAR(tty)); 637ab4382d2SGreg Kroah-Hartman } 638ab4382d2SGreg Kroah-Hartman 639ab4382d2SGreg Kroah-Hartman if (tty->termios->c_cflag & CRTSCTS) 640ab4382d2SGreg Kroah-Hartman uart_set_mctrl(port, TIOCM_RTS); 641ab4382d2SGreg Kroah-Hartman } 642ab4382d2SGreg Kroah-Hartman 643ab4382d2SGreg Kroah-Hartman static int uart_get_info(struct uart_state *state, 644ab4382d2SGreg Kroah-Hartman struct serial_struct __user *retinfo) 645ab4382d2SGreg Kroah-Hartman { 646ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 647ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 648ab4382d2SGreg Kroah-Hartman struct serial_struct tmp; 649ab4382d2SGreg Kroah-Hartman 650ab4382d2SGreg Kroah-Hartman memset(&tmp, 0, sizeof(tmp)); 651ab4382d2SGreg Kroah-Hartman 652ab4382d2SGreg Kroah-Hartman /* Ensure the state we copy is consistent and no hardware changes 653ab4382d2SGreg Kroah-Hartman occur as we go */ 654ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 655ab4382d2SGreg Kroah-Hartman 656ab4382d2SGreg Kroah-Hartman tmp.type = uport->type; 657ab4382d2SGreg Kroah-Hartman tmp.line = uport->line; 658ab4382d2SGreg Kroah-Hartman tmp.port = uport->iobase; 659ab4382d2SGreg Kroah-Hartman if (HIGH_BITS_OFFSET) 660ab4382d2SGreg Kroah-Hartman tmp.port_high = (long) uport->iobase >> HIGH_BITS_OFFSET; 661ab4382d2SGreg Kroah-Hartman tmp.irq = uport->irq; 662ab4382d2SGreg Kroah-Hartman tmp.flags = uport->flags; 663ab4382d2SGreg Kroah-Hartman tmp.xmit_fifo_size = uport->fifosize; 664ab4382d2SGreg Kroah-Hartman tmp.baud_base = uport->uartclk / 16; 665ab4382d2SGreg Kroah-Hartman tmp.close_delay = port->close_delay / 10; 666ab4382d2SGreg Kroah-Hartman tmp.closing_wait = port->closing_wait == ASYNC_CLOSING_WAIT_NONE ? 667ab4382d2SGreg Kroah-Hartman ASYNC_CLOSING_WAIT_NONE : 668ab4382d2SGreg Kroah-Hartman port->closing_wait / 10; 669ab4382d2SGreg Kroah-Hartman tmp.custom_divisor = uport->custom_divisor; 670ab4382d2SGreg Kroah-Hartman tmp.hub6 = uport->hub6; 671ab4382d2SGreg Kroah-Hartman tmp.io_type = uport->iotype; 672ab4382d2SGreg Kroah-Hartman tmp.iomem_reg_shift = uport->regshift; 673ab4382d2SGreg Kroah-Hartman tmp.iomem_base = (void *)(unsigned long)uport->mapbase; 674ab4382d2SGreg Kroah-Hartman 675ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 676ab4382d2SGreg Kroah-Hartman 677ab4382d2SGreg Kroah-Hartman if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) 678ab4382d2SGreg Kroah-Hartman return -EFAULT; 679ab4382d2SGreg Kroah-Hartman return 0; 680ab4382d2SGreg Kroah-Hartman } 681ab4382d2SGreg Kroah-Hartman 682ab4382d2SGreg Kroah-Hartman static int uart_set_info(struct tty_struct *tty, struct uart_state *state, 683ab4382d2SGreg Kroah-Hartman struct serial_struct __user *newinfo) 684ab4382d2SGreg Kroah-Hartman { 685ab4382d2SGreg Kroah-Hartman struct serial_struct new_serial; 686ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 687ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 688ab4382d2SGreg Kroah-Hartman unsigned long new_port; 689ab4382d2SGreg Kroah-Hartman unsigned int change_irq, change_port, closing_wait; 690ab4382d2SGreg Kroah-Hartman unsigned int old_custom_divisor, close_delay; 691ab4382d2SGreg Kroah-Hartman upf_t old_flags, new_flags; 692ab4382d2SGreg Kroah-Hartman int retval = 0; 693ab4382d2SGreg Kroah-Hartman 694ab4382d2SGreg Kroah-Hartman if (copy_from_user(&new_serial, newinfo, sizeof(new_serial))) 695ab4382d2SGreg Kroah-Hartman return -EFAULT; 696ab4382d2SGreg Kroah-Hartman 697ab4382d2SGreg Kroah-Hartman new_port = new_serial.port; 698ab4382d2SGreg Kroah-Hartman if (HIGH_BITS_OFFSET) 699ab4382d2SGreg Kroah-Hartman new_port += (unsigned long) new_serial.port_high << HIGH_BITS_OFFSET; 700ab4382d2SGreg Kroah-Hartman 701ab4382d2SGreg Kroah-Hartman new_serial.irq = irq_canonicalize(new_serial.irq); 702ab4382d2SGreg Kroah-Hartman close_delay = new_serial.close_delay * 10; 703ab4382d2SGreg Kroah-Hartman closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ? 704ab4382d2SGreg Kroah-Hartman ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10; 705ab4382d2SGreg Kroah-Hartman 706ab4382d2SGreg Kroah-Hartman /* 707ab4382d2SGreg Kroah-Hartman * This semaphore protects port->count. It is also 708ab4382d2SGreg Kroah-Hartman * very useful to prevent opens. Also, take the 709ab4382d2SGreg Kroah-Hartman * port configuration semaphore to make sure that a 710ab4382d2SGreg Kroah-Hartman * module insertion/removal doesn't change anything 711ab4382d2SGreg Kroah-Hartman * under us. 712ab4382d2SGreg Kroah-Hartman */ 713ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 714ab4382d2SGreg Kroah-Hartman 715ab4382d2SGreg Kroah-Hartman change_irq = !(uport->flags & UPF_FIXED_PORT) 716ab4382d2SGreg Kroah-Hartman && new_serial.irq != uport->irq; 717ab4382d2SGreg Kroah-Hartman 718ab4382d2SGreg Kroah-Hartman /* 719ab4382d2SGreg Kroah-Hartman * Since changing the 'type' of the port changes its resource 720ab4382d2SGreg Kroah-Hartman * allocations, we should treat type changes the same as 721ab4382d2SGreg Kroah-Hartman * IO port changes. 722ab4382d2SGreg Kroah-Hartman */ 723ab4382d2SGreg Kroah-Hartman change_port = !(uport->flags & UPF_FIXED_PORT) 724ab4382d2SGreg Kroah-Hartman && (new_port != uport->iobase || 725ab4382d2SGreg Kroah-Hartman (unsigned long)new_serial.iomem_base != uport->mapbase || 726ab4382d2SGreg Kroah-Hartman new_serial.hub6 != uport->hub6 || 727ab4382d2SGreg Kroah-Hartman new_serial.io_type != uport->iotype || 728ab4382d2SGreg Kroah-Hartman new_serial.iomem_reg_shift != uport->regshift || 729ab4382d2SGreg Kroah-Hartman new_serial.type != uport->type); 730ab4382d2SGreg Kroah-Hartman 731ab4382d2SGreg Kroah-Hartman old_flags = uport->flags; 732ab4382d2SGreg Kroah-Hartman new_flags = new_serial.flags; 733ab4382d2SGreg Kroah-Hartman old_custom_divisor = uport->custom_divisor; 734ab4382d2SGreg Kroah-Hartman 735ab4382d2SGreg Kroah-Hartman if (!capable(CAP_SYS_ADMIN)) { 736ab4382d2SGreg Kroah-Hartman retval = -EPERM; 737ab4382d2SGreg Kroah-Hartman if (change_irq || change_port || 738ab4382d2SGreg Kroah-Hartman (new_serial.baud_base != uport->uartclk / 16) || 739ab4382d2SGreg Kroah-Hartman (close_delay != port->close_delay) || 740ab4382d2SGreg Kroah-Hartman (closing_wait != port->closing_wait) || 741ab4382d2SGreg Kroah-Hartman (new_serial.xmit_fifo_size && 742ab4382d2SGreg Kroah-Hartman new_serial.xmit_fifo_size != uport->fifosize) || 743ab4382d2SGreg Kroah-Hartman (((new_flags ^ old_flags) & ~UPF_USR_MASK) != 0)) 744ab4382d2SGreg Kroah-Hartman goto exit; 745ab4382d2SGreg Kroah-Hartman uport->flags = ((uport->flags & ~UPF_USR_MASK) | 746ab4382d2SGreg Kroah-Hartman (new_flags & UPF_USR_MASK)); 747ab4382d2SGreg Kroah-Hartman uport->custom_divisor = new_serial.custom_divisor; 748ab4382d2SGreg Kroah-Hartman goto check_and_exit; 749ab4382d2SGreg Kroah-Hartman } 750ab4382d2SGreg Kroah-Hartman 751ab4382d2SGreg Kroah-Hartman /* 752ab4382d2SGreg Kroah-Hartman * Ask the low level driver to verify the settings. 753ab4382d2SGreg Kroah-Hartman */ 754ab4382d2SGreg Kroah-Hartman if (uport->ops->verify_port) 755ab4382d2SGreg Kroah-Hartman retval = uport->ops->verify_port(uport, &new_serial); 756ab4382d2SGreg Kroah-Hartman 757ab4382d2SGreg Kroah-Hartman if ((new_serial.irq >= nr_irqs) || (new_serial.irq < 0) || 758ab4382d2SGreg Kroah-Hartman (new_serial.baud_base < 9600)) 759ab4382d2SGreg Kroah-Hartman retval = -EINVAL; 760ab4382d2SGreg Kroah-Hartman 761ab4382d2SGreg Kroah-Hartman if (retval) 762ab4382d2SGreg Kroah-Hartman goto exit; 763ab4382d2SGreg Kroah-Hartman 764ab4382d2SGreg Kroah-Hartman if (change_port || change_irq) { 765ab4382d2SGreg Kroah-Hartman retval = -EBUSY; 766ab4382d2SGreg Kroah-Hartman 767ab4382d2SGreg Kroah-Hartman /* 768ab4382d2SGreg Kroah-Hartman * Make sure that we are the sole user of this port. 769ab4382d2SGreg Kroah-Hartman */ 770ab4382d2SGreg Kroah-Hartman if (tty_port_users(port) > 1) 771ab4382d2SGreg Kroah-Hartman goto exit; 772ab4382d2SGreg Kroah-Hartman 773ab4382d2SGreg Kroah-Hartman /* 774ab4382d2SGreg Kroah-Hartman * We need to shutdown the serial port at the old 775ab4382d2SGreg Kroah-Hartman * port/type/irq combination. 776ab4382d2SGreg Kroah-Hartman */ 777ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 778ab4382d2SGreg Kroah-Hartman } 779ab4382d2SGreg Kroah-Hartman 780ab4382d2SGreg Kroah-Hartman if (change_port) { 781ab4382d2SGreg Kroah-Hartman unsigned long old_iobase, old_mapbase; 782ab4382d2SGreg Kroah-Hartman unsigned int old_type, old_iotype, old_hub6, old_shift; 783ab4382d2SGreg Kroah-Hartman 784ab4382d2SGreg Kroah-Hartman old_iobase = uport->iobase; 785ab4382d2SGreg Kroah-Hartman old_mapbase = uport->mapbase; 786ab4382d2SGreg Kroah-Hartman old_type = uport->type; 787ab4382d2SGreg Kroah-Hartman old_hub6 = uport->hub6; 788ab4382d2SGreg Kroah-Hartman old_iotype = uport->iotype; 789ab4382d2SGreg Kroah-Hartman old_shift = uport->regshift; 790ab4382d2SGreg Kroah-Hartman 791ab4382d2SGreg Kroah-Hartman /* 792ab4382d2SGreg Kroah-Hartman * Free and release old regions 793ab4382d2SGreg Kroah-Hartman */ 794ab4382d2SGreg Kroah-Hartman if (old_type != PORT_UNKNOWN) 795ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 796ab4382d2SGreg Kroah-Hartman 797ab4382d2SGreg Kroah-Hartman uport->iobase = new_port; 798ab4382d2SGreg Kroah-Hartman uport->type = new_serial.type; 799ab4382d2SGreg Kroah-Hartman uport->hub6 = new_serial.hub6; 800ab4382d2SGreg Kroah-Hartman uport->iotype = new_serial.io_type; 801ab4382d2SGreg Kroah-Hartman uport->regshift = new_serial.iomem_reg_shift; 802ab4382d2SGreg Kroah-Hartman uport->mapbase = (unsigned long)new_serial.iomem_base; 803ab4382d2SGreg Kroah-Hartman 804ab4382d2SGreg Kroah-Hartman /* 805ab4382d2SGreg Kroah-Hartman * Claim and map the new regions 806ab4382d2SGreg Kroah-Hartman */ 807ab4382d2SGreg Kroah-Hartman if (uport->type != PORT_UNKNOWN) { 808ab4382d2SGreg Kroah-Hartman retval = uport->ops->request_port(uport); 809ab4382d2SGreg Kroah-Hartman } else { 810ab4382d2SGreg Kroah-Hartman /* Always success - Jean II */ 811ab4382d2SGreg Kroah-Hartman retval = 0; 812ab4382d2SGreg Kroah-Hartman } 813ab4382d2SGreg Kroah-Hartman 814ab4382d2SGreg Kroah-Hartman /* 815ab4382d2SGreg Kroah-Hartman * If we fail to request resources for the 816ab4382d2SGreg Kroah-Hartman * new port, try to restore the old settings. 817ab4382d2SGreg Kroah-Hartman */ 818ab4382d2SGreg Kroah-Hartman if (retval && old_type != PORT_UNKNOWN) { 819ab4382d2SGreg Kroah-Hartman uport->iobase = old_iobase; 820ab4382d2SGreg Kroah-Hartman uport->type = old_type; 821ab4382d2SGreg Kroah-Hartman uport->hub6 = old_hub6; 822ab4382d2SGreg Kroah-Hartman uport->iotype = old_iotype; 823ab4382d2SGreg Kroah-Hartman uport->regshift = old_shift; 824ab4382d2SGreg Kroah-Hartman uport->mapbase = old_mapbase; 825ab4382d2SGreg Kroah-Hartman retval = uport->ops->request_port(uport); 826ab4382d2SGreg Kroah-Hartman /* 827ab4382d2SGreg Kroah-Hartman * If we failed to restore the old settings, 828ab4382d2SGreg Kroah-Hartman * we fail like this. 829ab4382d2SGreg Kroah-Hartman */ 830ab4382d2SGreg Kroah-Hartman if (retval) 831ab4382d2SGreg Kroah-Hartman uport->type = PORT_UNKNOWN; 832ab4382d2SGreg Kroah-Hartman 833ab4382d2SGreg Kroah-Hartman /* 834ab4382d2SGreg Kroah-Hartman * We failed anyway. 835ab4382d2SGreg Kroah-Hartman */ 836ab4382d2SGreg Kroah-Hartman retval = -EBUSY; 837ab4382d2SGreg Kroah-Hartman /* Added to return the correct error -Ram Gupta */ 838ab4382d2SGreg Kroah-Hartman goto exit; 839ab4382d2SGreg Kroah-Hartman } 840ab4382d2SGreg Kroah-Hartman } 841ab4382d2SGreg Kroah-Hartman 842ab4382d2SGreg Kroah-Hartman if (change_irq) 843ab4382d2SGreg Kroah-Hartman uport->irq = new_serial.irq; 844ab4382d2SGreg Kroah-Hartman if (!(uport->flags & UPF_FIXED_PORT)) 845ab4382d2SGreg Kroah-Hartman uport->uartclk = new_serial.baud_base * 16; 846ab4382d2SGreg Kroah-Hartman uport->flags = (uport->flags & ~UPF_CHANGE_MASK) | 847ab4382d2SGreg Kroah-Hartman (new_flags & UPF_CHANGE_MASK); 848ab4382d2SGreg Kroah-Hartman uport->custom_divisor = new_serial.custom_divisor; 849ab4382d2SGreg Kroah-Hartman port->close_delay = close_delay; 850ab4382d2SGreg Kroah-Hartman port->closing_wait = closing_wait; 851ab4382d2SGreg Kroah-Hartman if (new_serial.xmit_fifo_size) 852ab4382d2SGreg Kroah-Hartman uport->fifosize = new_serial.xmit_fifo_size; 853ab4382d2SGreg Kroah-Hartman if (port->tty) 854ab4382d2SGreg Kroah-Hartman port->tty->low_latency = 855ab4382d2SGreg Kroah-Hartman (uport->flags & UPF_LOW_LATENCY) ? 1 : 0; 856ab4382d2SGreg Kroah-Hartman 857ab4382d2SGreg Kroah-Hartman check_and_exit: 858ab4382d2SGreg Kroah-Hartman retval = 0; 859ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) 860ab4382d2SGreg Kroah-Hartman goto exit; 861ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_INITIALIZED) { 862ab4382d2SGreg Kroah-Hartman if (((old_flags ^ uport->flags) & UPF_SPD_MASK) || 863ab4382d2SGreg Kroah-Hartman old_custom_divisor != uport->custom_divisor) { 864ab4382d2SGreg Kroah-Hartman /* 865ab4382d2SGreg Kroah-Hartman * If they're setting up a custom divisor or speed, 866ab4382d2SGreg Kroah-Hartman * instead of clearing it, then bitch about it. No 867ab4382d2SGreg Kroah-Hartman * need to rate-limit; it's CAP_SYS_ADMIN only. 868ab4382d2SGreg Kroah-Hartman */ 869ab4382d2SGreg Kroah-Hartman if (uport->flags & UPF_SPD_MASK) { 870ab4382d2SGreg Kroah-Hartman char buf[64]; 871ab4382d2SGreg Kroah-Hartman printk(KERN_NOTICE 872ab4382d2SGreg Kroah-Hartman "%s sets custom speed on %s. This " 873ab4382d2SGreg Kroah-Hartman "is deprecated.\n", current->comm, 874ab4382d2SGreg Kroah-Hartman tty_name(port->tty, buf)); 875ab4382d2SGreg Kroah-Hartman } 876ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 877ab4382d2SGreg Kroah-Hartman } 878ab4382d2SGreg Kroah-Hartman } else 879ab4382d2SGreg Kroah-Hartman retval = uart_startup(tty, state, 1); 880ab4382d2SGreg Kroah-Hartman exit: 881ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 882ab4382d2SGreg Kroah-Hartman return retval; 883ab4382d2SGreg Kroah-Hartman } 884ab4382d2SGreg Kroah-Hartman 885ab4382d2SGreg Kroah-Hartman /** 886ab4382d2SGreg Kroah-Hartman * uart_get_lsr_info - get line status register info 887ab4382d2SGreg Kroah-Hartman * @tty: tty associated with the UART 888ab4382d2SGreg Kroah-Hartman * @state: UART being queried 889ab4382d2SGreg Kroah-Hartman * @value: returned modem value 890ab4382d2SGreg Kroah-Hartman * 891ab4382d2SGreg Kroah-Hartman * Note: uart_ioctl protects us against hangups. 892ab4382d2SGreg Kroah-Hartman */ 893ab4382d2SGreg Kroah-Hartman static int uart_get_lsr_info(struct tty_struct *tty, 894ab4382d2SGreg Kroah-Hartman struct uart_state *state, unsigned int __user *value) 895ab4382d2SGreg Kroah-Hartman { 896ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 897ab4382d2SGreg Kroah-Hartman unsigned int result; 898ab4382d2SGreg Kroah-Hartman 899ab4382d2SGreg Kroah-Hartman result = uport->ops->tx_empty(uport); 900ab4382d2SGreg Kroah-Hartman 901ab4382d2SGreg Kroah-Hartman /* 902ab4382d2SGreg Kroah-Hartman * If we're about to load something into the transmit 903ab4382d2SGreg Kroah-Hartman * register, we'll pretend the transmitter isn't empty to 904ab4382d2SGreg Kroah-Hartman * avoid a race condition (depending on when the transmit 905ab4382d2SGreg Kroah-Hartman * interrupt happens). 906ab4382d2SGreg Kroah-Hartman */ 907ab4382d2SGreg Kroah-Hartman if (uport->x_char || 908ab4382d2SGreg Kroah-Hartman ((uart_circ_chars_pending(&state->xmit) > 0) && 909ab4382d2SGreg Kroah-Hartman !tty->stopped && !tty->hw_stopped)) 910ab4382d2SGreg Kroah-Hartman result &= ~TIOCSER_TEMT; 911ab4382d2SGreg Kroah-Hartman 912ab4382d2SGreg Kroah-Hartman return put_user(result, value); 913ab4382d2SGreg Kroah-Hartman } 914ab4382d2SGreg Kroah-Hartman 91560b33c13SAlan Cox static int uart_tiocmget(struct tty_struct *tty) 916ab4382d2SGreg Kroah-Hartman { 917ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 918ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 919ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 920ab4382d2SGreg Kroah-Hartman int result = -EIO; 921ab4382d2SGreg Kroah-Hartman 922ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 92360b33c13SAlan Cox if (!(tty->flags & (1 << TTY_IO_ERROR))) { 924ab4382d2SGreg Kroah-Hartman result = uport->mctrl; 925ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 926ab4382d2SGreg Kroah-Hartman result |= uport->ops->get_mctrl(uport); 927ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 928ab4382d2SGreg Kroah-Hartman } 929ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 930ab4382d2SGreg Kroah-Hartman 931ab4382d2SGreg Kroah-Hartman return result; 932ab4382d2SGreg Kroah-Hartman } 933ab4382d2SGreg Kroah-Hartman 934ab4382d2SGreg Kroah-Hartman static int 93520b9d177SAlan Cox uart_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear) 936ab4382d2SGreg Kroah-Hartman { 937ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 938ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 939ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 940ab4382d2SGreg Kroah-Hartman int ret = -EIO; 941ab4382d2SGreg Kroah-Hartman 942ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 94320b9d177SAlan Cox if (!(tty->flags & (1 << TTY_IO_ERROR))) { 944ab4382d2SGreg Kroah-Hartman uart_update_mctrl(uport, set, clear); 945ab4382d2SGreg Kroah-Hartman ret = 0; 946ab4382d2SGreg Kroah-Hartman } 947ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 948ab4382d2SGreg Kroah-Hartman return ret; 949ab4382d2SGreg Kroah-Hartman } 950ab4382d2SGreg Kroah-Hartman 951ab4382d2SGreg Kroah-Hartman static int uart_break_ctl(struct tty_struct *tty, int break_state) 952ab4382d2SGreg Kroah-Hartman { 953ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 954ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 955ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 956ab4382d2SGreg Kroah-Hartman 957ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 958ab4382d2SGreg Kroah-Hartman 959ab4382d2SGreg Kroah-Hartman if (uport->type != PORT_UNKNOWN) 960ab4382d2SGreg Kroah-Hartman uport->ops->break_ctl(uport, break_state); 961ab4382d2SGreg Kroah-Hartman 962ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 963ab4382d2SGreg Kroah-Hartman return 0; 964ab4382d2SGreg Kroah-Hartman } 965ab4382d2SGreg Kroah-Hartman 966ab4382d2SGreg Kroah-Hartman static int uart_do_autoconfig(struct tty_struct *tty,struct uart_state *state) 967ab4382d2SGreg Kroah-Hartman { 968ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 969ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 970ab4382d2SGreg Kroah-Hartman int flags, ret; 971ab4382d2SGreg Kroah-Hartman 972ab4382d2SGreg Kroah-Hartman if (!capable(CAP_SYS_ADMIN)) 973ab4382d2SGreg Kroah-Hartman return -EPERM; 974ab4382d2SGreg Kroah-Hartman 975ab4382d2SGreg Kroah-Hartman /* 976ab4382d2SGreg Kroah-Hartman * Take the per-port semaphore. This prevents count from 977ab4382d2SGreg Kroah-Hartman * changing, and hence any extra opens of the port while 978ab4382d2SGreg Kroah-Hartman * we're auto-configuring. 979ab4382d2SGreg Kroah-Hartman */ 980ab4382d2SGreg Kroah-Hartman if (mutex_lock_interruptible(&port->mutex)) 981ab4382d2SGreg Kroah-Hartman return -ERESTARTSYS; 982ab4382d2SGreg Kroah-Hartman 983ab4382d2SGreg Kroah-Hartman ret = -EBUSY; 984ab4382d2SGreg Kroah-Hartman if (tty_port_users(port) == 1) { 985ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 986ab4382d2SGreg Kroah-Hartman 987ab4382d2SGreg Kroah-Hartman /* 988ab4382d2SGreg Kroah-Hartman * If we already have a port type configured, 989ab4382d2SGreg Kroah-Hartman * we must release its resources. 990ab4382d2SGreg Kroah-Hartman */ 991ab4382d2SGreg Kroah-Hartman if (uport->type != PORT_UNKNOWN) 992ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 993ab4382d2SGreg Kroah-Hartman 994ab4382d2SGreg Kroah-Hartman flags = UART_CONFIG_TYPE; 995ab4382d2SGreg Kroah-Hartman if (uport->flags & UPF_AUTO_IRQ) 996ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_IRQ; 997ab4382d2SGreg Kroah-Hartman 998ab4382d2SGreg Kroah-Hartman /* 999ab4382d2SGreg Kroah-Hartman * This will claim the ports resources if 1000ab4382d2SGreg Kroah-Hartman * a port is found. 1001ab4382d2SGreg Kroah-Hartman */ 1002ab4382d2SGreg Kroah-Hartman uport->ops->config_port(uport, flags); 1003ab4382d2SGreg Kroah-Hartman 1004ab4382d2SGreg Kroah-Hartman ret = uart_startup(tty, state, 1); 1005ab4382d2SGreg Kroah-Hartman } 1006ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1007ab4382d2SGreg Kroah-Hartman return ret; 1008ab4382d2SGreg Kroah-Hartman } 1009ab4382d2SGreg Kroah-Hartman 1010ab4382d2SGreg Kroah-Hartman /* 1011ab4382d2SGreg Kroah-Hartman * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change 1012ab4382d2SGreg Kroah-Hartman * - mask passed in arg for lines of interest 1013ab4382d2SGreg Kroah-Hartman * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) 1014ab4382d2SGreg Kroah-Hartman * Caller should use TIOCGICOUNT to see which one it was 1015ab4382d2SGreg Kroah-Hartman * 1016ab4382d2SGreg Kroah-Hartman * FIXME: This wants extracting into a common all driver implementation 1017ab4382d2SGreg Kroah-Hartman * of TIOCMWAIT using tty_port. 1018ab4382d2SGreg Kroah-Hartman */ 1019ab4382d2SGreg Kroah-Hartman static int 1020ab4382d2SGreg Kroah-Hartman uart_wait_modem_status(struct uart_state *state, unsigned long arg) 1021ab4382d2SGreg Kroah-Hartman { 1022ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1023ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1024ab4382d2SGreg Kroah-Hartman DECLARE_WAITQUEUE(wait, current); 1025ab4382d2SGreg Kroah-Hartman struct uart_icount cprev, cnow; 1026ab4382d2SGreg Kroah-Hartman int ret; 1027ab4382d2SGreg Kroah-Hartman 1028ab4382d2SGreg Kroah-Hartman /* 1029ab4382d2SGreg Kroah-Hartman * note the counters on entry 1030ab4382d2SGreg Kroah-Hartman */ 1031ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1032ab4382d2SGreg Kroah-Hartman memcpy(&cprev, &uport->icount, sizeof(struct uart_icount)); 1033ab4382d2SGreg Kroah-Hartman 1034ab4382d2SGreg Kroah-Hartman /* 1035ab4382d2SGreg Kroah-Hartman * Force modem status interrupts on 1036ab4382d2SGreg Kroah-Hartman */ 1037ab4382d2SGreg Kroah-Hartman uport->ops->enable_ms(uport); 1038ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1039ab4382d2SGreg Kroah-Hartman 1040ab4382d2SGreg Kroah-Hartman add_wait_queue(&port->delta_msr_wait, &wait); 1041ab4382d2SGreg Kroah-Hartman for (;;) { 1042ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1043ab4382d2SGreg Kroah-Hartman memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); 1044ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1045ab4382d2SGreg Kroah-Hartman 1046ab4382d2SGreg Kroah-Hartman set_current_state(TASK_INTERRUPTIBLE); 1047ab4382d2SGreg Kroah-Hartman 1048ab4382d2SGreg Kroah-Hartman if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || 1049ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || 1050ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || 1051ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) { 1052ab4382d2SGreg Kroah-Hartman ret = 0; 1053ab4382d2SGreg Kroah-Hartman break; 1054ab4382d2SGreg Kroah-Hartman } 1055ab4382d2SGreg Kroah-Hartman 1056ab4382d2SGreg Kroah-Hartman schedule(); 1057ab4382d2SGreg Kroah-Hartman 1058ab4382d2SGreg Kroah-Hartman /* see if a signal did it */ 1059ab4382d2SGreg Kroah-Hartman if (signal_pending(current)) { 1060ab4382d2SGreg Kroah-Hartman ret = -ERESTARTSYS; 1061ab4382d2SGreg Kroah-Hartman break; 1062ab4382d2SGreg Kroah-Hartman } 1063ab4382d2SGreg Kroah-Hartman 1064ab4382d2SGreg Kroah-Hartman cprev = cnow; 1065ab4382d2SGreg Kroah-Hartman } 1066ab4382d2SGreg Kroah-Hartman 1067ab4382d2SGreg Kroah-Hartman current->state = TASK_RUNNING; 1068ab4382d2SGreg Kroah-Hartman remove_wait_queue(&port->delta_msr_wait, &wait); 1069ab4382d2SGreg Kroah-Hartman 1070ab4382d2SGreg Kroah-Hartman return ret; 1071ab4382d2SGreg Kroah-Hartman } 1072ab4382d2SGreg Kroah-Hartman 1073ab4382d2SGreg Kroah-Hartman /* 1074ab4382d2SGreg Kroah-Hartman * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) 1075ab4382d2SGreg Kroah-Hartman * Return: write counters to the user passed counter struct 1076ab4382d2SGreg Kroah-Hartman * NB: both 1->0 and 0->1 transitions are counted except for 1077ab4382d2SGreg Kroah-Hartman * RI where only 0->1 is counted. 1078ab4382d2SGreg Kroah-Hartman */ 1079ab4382d2SGreg Kroah-Hartman static int uart_get_icount(struct tty_struct *tty, 1080ab4382d2SGreg Kroah-Hartman struct serial_icounter_struct *icount) 1081ab4382d2SGreg Kroah-Hartman { 1082ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1083ab4382d2SGreg Kroah-Hartman struct uart_icount cnow; 1084ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1085ab4382d2SGreg Kroah-Hartman 1086ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1087ab4382d2SGreg Kroah-Hartman memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); 1088ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1089ab4382d2SGreg Kroah-Hartman 1090ab4382d2SGreg Kroah-Hartman icount->cts = cnow.cts; 1091ab4382d2SGreg Kroah-Hartman icount->dsr = cnow.dsr; 1092ab4382d2SGreg Kroah-Hartman icount->rng = cnow.rng; 1093ab4382d2SGreg Kroah-Hartman icount->dcd = cnow.dcd; 1094ab4382d2SGreg Kroah-Hartman icount->rx = cnow.rx; 1095ab4382d2SGreg Kroah-Hartman icount->tx = cnow.tx; 1096ab4382d2SGreg Kroah-Hartman icount->frame = cnow.frame; 1097ab4382d2SGreg Kroah-Hartman icount->overrun = cnow.overrun; 1098ab4382d2SGreg Kroah-Hartman icount->parity = cnow.parity; 1099ab4382d2SGreg Kroah-Hartman icount->brk = cnow.brk; 1100ab4382d2SGreg Kroah-Hartman icount->buf_overrun = cnow.buf_overrun; 1101ab4382d2SGreg Kroah-Hartman 1102ab4382d2SGreg Kroah-Hartman return 0; 1103ab4382d2SGreg Kroah-Hartman } 1104ab4382d2SGreg Kroah-Hartman 1105ab4382d2SGreg Kroah-Hartman /* 1106ab4382d2SGreg Kroah-Hartman * Called via sys_ioctl. We can use spin_lock_irq() here. 1107ab4382d2SGreg Kroah-Hartman */ 1108ab4382d2SGreg Kroah-Hartman static int 11096caa76b7SAlan Cox uart_ioctl(struct tty_struct *tty, unsigned int cmd, 1110ab4382d2SGreg Kroah-Hartman unsigned long arg) 1111ab4382d2SGreg Kroah-Hartman { 1112ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1113ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1114ab4382d2SGreg Kroah-Hartman void __user *uarg = (void __user *)arg; 1115ab4382d2SGreg Kroah-Hartman int ret = -ENOIOCTLCMD; 1116ab4382d2SGreg Kroah-Hartman 1117ab4382d2SGreg Kroah-Hartman 1118ab4382d2SGreg Kroah-Hartman /* 1119ab4382d2SGreg Kroah-Hartman * These ioctls don't rely on the hardware to be present. 1120ab4382d2SGreg Kroah-Hartman */ 1121ab4382d2SGreg Kroah-Hartman switch (cmd) { 1122ab4382d2SGreg Kroah-Hartman case TIOCGSERIAL: 1123ab4382d2SGreg Kroah-Hartman ret = uart_get_info(state, uarg); 1124ab4382d2SGreg Kroah-Hartman break; 1125ab4382d2SGreg Kroah-Hartman 1126ab4382d2SGreg Kroah-Hartman case TIOCSSERIAL: 1127ab4382d2SGreg Kroah-Hartman ret = uart_set_info(tty, state, uarg); 1128ab4382d2SGreg Kroah-Hartman break; 1129ab4382d2SGreg Kroah-Hartman 1130ab4382d2SGreg Kroah-Hartman case TIOCSERCONFIG: 1131ab4382d2SGreg Kroah-Hartman ret = uart_do_autoconfig(tty, state); 1132ab4382d2SGreg Kroah-Hartman break; 1133ab4382d2SGreg Kroah-Hartman 1134ab4382d2SGreg Kroah-Hartman case TIOCSERGWILD: /* obsolete */ 1135ab4382d2SGreg Kroah-Hartman case TIOCSERSWILD: /* obsolete */ 1136ab4382d2SGreg Kroah-Hartman ret = 0; 1137ab4382d2SGreg Kroah-Hartman break; 1138ab4382d2SGreg Kroah-Hartman } 1139ab4382d2SGreg Kroah-Hartman 1140ab4382d2SGreg Kroah-Hartman if (ret != -ENOIOCTLCMD) 1141ab4382d2SGreg Kroah-Hartman goto out; 1142ab4382d2SGreg Kroah-Hartman 1143ab4382d2SGreg Kroah-Hartman if (tty->flags & (1 << TTY_IO_ERROR)) { 1144ab4382d2SGreg Kroah-Hartman ret = -EIO; 1145ab4382d2SGreg Kroah-Hartman goto out; 1146ab4382d2SGreg Kroah-Hartman } 1147ab4382d2SGreg Kroah-Hartman 1148ab4382d2SGreg Kroah-Hartman /* 1149ab4382d2SGreg Kroah-Hartman * The following should only be used when hardware is present. 1150ab4382d2SGreg Kroah-Hartman */ 1151ab4382d2SGreg Kroah-Hartman switch (cmd) { 1152ab4382d2SGreg Kroah-Hartman case TIOCMIWAIT: 1153ab4382d2SGreg Kroah-Hartman ret = uart_wait_modem_status(state, arg); 1154ab4382d2SGreg Kroah-Hartman break; 1155ab4382d2SGreg Kroah-Hartman } 1156ab4382d2SGreg Kroah-Hartman 1157ab4382d2SGreg Kroah-Hartman if (ret != -ENOIOCTLCMD) 1158ab4382d2SGreg Kroah-Hartman goto out; 1159ab4382d2SGreg Kroah-Hartman 1160ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1161ab4382d2SGreg Kroah-Hartman 11626caa76b7SAlan Cox if (tty->flags & (1 << TTY_IO_ERROR)) { 1163ab4382d2SGreg Kroah-Hartman ret = -EIO; 1164ab4382d2SGreg Kroah-Hartman goto out_up; 1165ab4382d2SGreg Kroah-Hartman } 1166ab4382d2SGreg Kroah-Hartman 1167ab4382d2SGreg Kroah-Hartman /* 1168ab4382d2SGreg Kroah-Hartman * All these rely on hardware being present and need to be 1169ab4382d2SGreg Kroah-Hartman * protected against the tty being hung up. 1170ab4382d2SGreg Kroah-Hartman */ 1171ab4382d2SGreg Kroah-Hartman switch (cmd) { 1172ab4382d2SGreg Kroah-Hartman case TIOCSERGETLSR: /* Get line status register */ 1173ab4382d2SGreg Kroah-Hartman ret = uart_get_lsr_info(tty, state, uarg); 1174ab4382d2SGreg Kroah-Hartman break; 1175ab4382d2SGreg Kroah-Hartman 1176ab4382d2SGreg Kroah-Hartman default: { 1177ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1178ab4382d2SGreg Kroah-Hartman if (uport->ops->ioctl) 1179ab4382d2SGreg Kroah-Hartman ret = uport->ops->ioctl(uport, cmd, arg); 1180ab4382d2SGreg Kroah-Hartman break; 1181ab4382d2SGreg Kroah-Hartman } 1182ab4382d2SGreg Kroah-Hartman } 1183ab4382d2SGreg Kroah-Hartman out_up: 1184ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1185ab4382d2SGreg Kroah-Hartman out: 1186ab4382d2SGreg Kroah-Hartman return ret; 1187ab4382d2SGreg Kroah-Hartman } 1188ab4382d2SGreg Kroah-Hartman 1189ab4382d2SGreg Kroah-Hartman static void uart_set_ldisc(struct tty_struct *tty) 1190ab4382d2SGreg Kroah-Hartman { 1191ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1192ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1193ab4382d2SGreg Kroah-Hartman 1194ab4382d2SGreg Kroah-Hartman if (uport->ops->set_ldisc) 1195ab4382d2SGreg Kroah-Hartman uport->ops->set_ldisc(uport, tty->termios->c_line); 1196ab4382d2SGreg Kroah-Hartman } 1197ab4382d2SGreg Kroah-Hartman 1198ab4382d2SGreg Kroah-Hartman static void uart_set_termios(struct tty_struct *tty, 1199ab4382d2SGreg Kroah-Hartman struct ktermios *old_termios) 1200ab4382d2SGreg Kroah-Hartman { 1201ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1202ab4382d2SGreg Kroah-Hartman unsigned long flags; 1203ab4382d2SGreg Kroah-Hartman unsigned int cflag = tty->termios->c_cflag; 1204ab4382d2SGreg Kroah-Hartman 1205ab4382d2SGreg Kroah-Hartman 1206ab4382d2SGreg Kroah-Hartman /* 1207ab4382d2SGreg Kroah-Hartman * These are the bits that are used to setup various 1208ab4382d2SGreg Kroah-Hartman * flags in the low level driver. We can ignore the Bfoo 1209ab4382d2SGreg Kroah-Hartman * bits in c_cflag; c_[io]speed will always be set 1210ab4382d2SGreg Kroah-Hartman * appropriately by set_termios() in tty_ioctl.c 1211ab4382d2SGreg Kroah-Hartman */ 1212ab4382d2SGreg Kroah-Hartman #define RELEVANT_IFLAG(iflag) ((iflag) & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK)) 1213ab4382d2SGreg Kroah-Hartman if ((cflag ^ old_termios->c_cflag) == 0 && 1214ab4382d2SGreg Kroah-Hartman tty->termios->c_ospeed == old_termios->c_ospeed && 1215ab4382d2SGreg Kroah-Hartman tty->termios->c_ispeed == old_termios->c_ispeed && 1216ab4382d2SGreg Kroah-Hartman RELEVANT_IFLAG(tty->termios->c_iflag ^ old_termios->c_iflag) == 0) { 1217ab4382d2SGreg Kroah-Hartman return; 1218ab4382d2SGreg Kroah-Hartman } 1219ab4382d2SGreg Kroah-Hartman 1220ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, old_termios); 1221ab4382d2SGreg Kroah-Hartman 1222ab4382d2SGreg Kroah-Hartman /* Handle transition to B0 status */ 1223ab4382d2SGreg Kroah-Hartman if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) 1224ab4382d2SGreg Kroah-Hartman uart_clear_mctrl(state->uart_port, TIOCM_RTS | TIOCM_DTR); 1225ab4382d2SGreg Kroah-Hartman /* Handle transition away from B0 status */ 1226ab4382d2SGreg Kroah-Hartman else if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { 1227ab4382d2SGreg Kroah-Hartman unsigned int mask = TIOCM_DTR; 1228ab4382d2SGreg Kroah-Hartman if (!(cflag & CRTSCTS) || 1229ab4382d2SGreg Kroah-Hartman !test_bit(TTY_THROTTLED, &tty->flags)) 1230ab4382d2SGreg Kroah-Hartman mask |= TIOCM_RTS; 1231ab4382d2SGreg Kroah-Hartman uart_set_mctrl(state->uart_port, mask); 1232ab4382d2SGreg Kroah-Hartman } 1233ab4382d2SGreg Kroah-Hartman 1234ab4382d2SGreg Kroah-Hartman /* Handle turning off CRTSCTS */ 1235ab4382d2SGreg Kroah-Hartman if ((old_termios->c_cflag & CRTSCTS) && !(cflag & CRTSCTS)) { 1236ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&state->uart_port->lock, flags); 1237ab4382d2SGreg Kroah-Hartman tty->hw_stopped = 0; 1238ab4382d2SGreg Kroah-Hartman __uart_start(tty); 1239ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&state->uart_port->lock, flags); 1240ab4382d2SGreg Kroah-Hartman } 1241ab4382d2SGreg Kroah-Hartman /* Handle turning on CRTSCTS */ 1242ab4382d2SGreg Kroah-Hartman else if (!(old_termios->c_cflag & CRTSCTS) && (cflag & CRTSCTS)) { 1243ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&state->uart_port->lock, flags); 1244ab4382d2SGreg Kroah-Hartman if (!(state->uart_port->ops->get_mctrl(state->uart_port) & TIOCM_CTS)) { 1245ab4382d2SGreg Kroah-Hartman tty->hw_stopped = 1; 1246ab4382d2SGreg Kroah-Hartman state->uart_port->ops->stop_tx(state->uart_port); 1247ab4382d2SGreg Kroah-Hartman } 1248ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&state->uart_port->lock, flags); 1249ab4382d2SGreg Kroah-Hartman } 1250ab4382d2SGreg Kroah-Hartman } 1251ab4382d2SGreg Kroah-Hartman 1252ab4382d2SGreg Kroah-Hartman /* 1253ab4382d2SGreg Kroah-Hartman * In 2.4.5, calls to this will be serialized via the BKL in 1254ab4382d2SGreg Kroah-Hartman * linux/drivers/char/tty_io.c:tty_release() 1255ab4382d2SGreg Kroah-Hartman * linux/drivers/char/tty_io.c:do_tty_handup() 1256ab4382d2SGreg Kroah-Hartman */ 1257ab4382d2SGreg Kroah-Hartman static void uart_close(struct tty_struct *tty, struct file *filp) 1258ab4382d2SGreg Kroah-Hartman { 1259ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1260ab4382d2SGreg Kroah-Hartman struct tty_port *port; 1261ab4382d2SGreg Kroah-Hartman struct uart_port *uport; 1262ab4382d2SGreg Kroah-Hartman unsigned long flags; 1263ab4382d2SGreg Kroah-Hartman 1264ab4382d2SGreg Kroah-Hartman BUG_ON(!tty_locked()); 1265ab4382d2SGreg Kroah-Hartman 1266ab4382d2SGreg Kroah-Hartman if (!state) 1267ab4382d2SGreg Kroah-Hartman return; 1268ab4382d2SGreg Kroah-Hartman 1269ab4382d2SGreg Kroah-Hartman uport = state->uart_port; 1270ab4382d2SGreg Kroah-Hartman port = &state->port; 1271ab4382d2SGreg Kroah-Hartman 1272ab4382d2SGreg Kroah-Hartman pr_debug("uart_close(%d) called\n", uport->line); 1273ab4382d2SGreg Kroah-Hartman 1274ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1275ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 1276ab4382d2SGreg Kroah-Hartman 1277ab4382d2SGreg Kroah-Hartman if (tty_hung_up_p(filp)) { 1278ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 1279ab4382d2SGreg Kroah-Hartman goto done; 1280ab4382d2SGreg Kroah-Hartman } 1281ab4382d2SGreg Kroah-Hartman 1282ab4382d2SGreg Kroah-Hartman if ((tty->count == 1) && (port->count != 1)) { 1283ab4382d2SGreg Kroah-Hartman /* 1284ab4382d2SGreg Kroah-Hartman * Uh, oh. tty->count is 1, which means that the tty 1285ab4382d2SGreg Kroah-Hartman * structure will be freed. port->count should always 1286ab4382d2SGreg Kroah-Hartman * be one in these conditions. If it's greater than 1287ab4382d2SGreg Kroah-Hartman * one, we've got real problems, since it means the 1288ab4382d2SGreg Kroah-Hartman * serial port won't be shutdown. 1289ab4382d2SGreg Kroah-Hartman */ 1290ab4382d2SGreg Kroah-Hartman printk(KERN_ERR "uart_close: bad serial port count; tty->count is 1, " 1291ab4382d2SGreg Kroah-Hartman "port->count is %d\n", port->count); 1292ab4382d2SGreg Kroah-Hartman port->count = 1; 1293ab4382d2SGreg Kroah-Hartman } 1294ab4382d2SGreg Kroah-Hartman if (--port->count < 0) { 1295ab4382d2SGreg Kroah-Hartman printk(KERN_ERR "uart_close: bad serial port count for %s: %d\n", 1296ab4382d2SGreg Kroah-Hartman tty->name, port->count); 1297ab4382d2SGreg Kroah-Hartman port->count = 0; 1298ab4382d2SGreg Kroah-Hartman } 1299ab4382d2SGreg Kroah-Hartman if (port->count) { 1300ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 1301ab4382d2SGreg Kroah-Hartman goto done; 1302ab4382d2SGreg Kroah-Hartman } 1303ab4382d2SGreg Kroah-Hartman 1304ab4382d2SGreg Kroah-Hartman /* 1305ab4382d2SGreg Kroah-Hartman * Now we wait for the transmit buffer to clear; and we notify 1306ab4382d2SGreg Kroah-Hartman * the line discipline to only process XON/XOFF characters by 1307ab4382d2SGreg Kroah-Hartman * setting tty->closing. 1308ab4382d2SGreg Kroah-Hartman */ 1309ab4382d2SGreg Kroah-Hartman tty->closing = 1; 1310ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 1311ab4382d2SGreg Kroah-Hartman 1312ab4382d2SGreg Kroah-Hartman if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE) { 1313ab4382d2SGreg Kroah-Hartman /* 1314ab4382d2SGreg Kroah-Hartman * hack: open-coded tty_wait_until_sent to avoid 1315ab4382d2SGreg Kroah-Hartman * recursive tty_lock 1316ab4382d2SGreg Kroah-Hartman */ 1317ab4382d2SGreg Kroah-Hartman long timeout = msecs_to_jiffies(port->closing_wait); 1318ab4382d2SGreg Kroah-Hartman if (wait_event_interruptible_timeout(tty->write_wait, 1319ab4382d2SGreg Kroah-Hartman !tty_chars_in_buffer(tty), timeout) >= 0) 1320ab4382d2SGreg Kroah-Hartman __uart_wait_until_sent(uport, timeout); 1321ab4382d2SGreg Kroah-Hartman } 1322ab4382d2SGreg Kroah-Hartman 1323ab4382d2SGreg Kroah-Hartman /* 1324ab4382d2SGreg Kroah-Hartman * At this point, we stop accepting input. To do this, we 1325ab4382d2SGreg Kroah-Hartman * disable the receive line status interrupts. 1326ab4382d2SGreg Kroah-Hartman */ 1327ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_INITIALIZED) { 1328ab4382d2SGreg Kroah-Hartman unsigned long flags; 1329ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&uport->lock, flags); 1330ab4382d2SGreg Kroah-Hartman uport->ops->stop_rx(uport); 1331ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&uport->lock, flags); 1332ab4382d2SGreg Kroah-Hartman /* 1333ab4382d2SGreg Kroah-Hartman * Before we drop DTR, make sure the UART transmitter 1334ab4382d2SGreg Kroah-Hartman * has completely drained; this is especially 1335ab4382d2SGreg Kroah-Hartman * important if there is a transmit FIFO! 1336ab4382d2SGreg Kroah-Hartman */ 1337ab4382d2SGreg Kroah-Hartman __uart_wait_until_sent(uport, uport->timeout); 1338ab4382d2SGreg Kroah-Hartman } 1339ab4382d2SGreg Kroah-Hartman 1340ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 1341ab4382d2SGreg Kroah-Hartman uart_flush_buffer(tty); 1342ab4382d2SGreg Kroah-Hartman 1343ab4382d2SGreg Kroah-Hartman tty_ldisc_flush(tty); 1344ab4382d2SGreg Kroah-Hartman 1345ab4382d2SGreg Kroah-Hartman tty_port_tty_set(port, NULL); 1346ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 1347ab4382d2SGreg Kroah-Hartman tty->closing = 0; 1348ab4382d2SGreg Kroah-Hartman 1349ab4382d2SGreg Kroah-Hartman if (port->blocked_open) { 1350ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 1351ab4382d2SGreg Kroah-Hartman if (port->close_delay) 1352ab4382d2SGreg Kroah-Hartman msleep_interruptible(port->close_delay); 1353ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 1354ab4382d2SGreg Kroah-Hartman } else if (!uart_console(uport)) { 1355ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 1356ab4382d2SGreg Kroah-Hartman uart_change_pm(state, 3); 1357ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 1358ab4382d2SGreg Kroah-Hartman } 1359ab4382d2SGreg Kroah-Hartman 1360ab4382d2SGreg Kroah-Hartman /* 1361ab4382d2SGreg Kroah-Hartman * Wake up anyone trying to open this port. 1362ab4382d2SGreg Kroah-Hartman */ 1363ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); 1364ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 1365ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->open_wait); 1366ab4382d2SGreg Kroah-Hartman 1367ab4382d2SGreg Kroah-Hartman done: 1368ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1369ab4382d2SGreg Kroah-Hartman } 1370ab4382d2SGreg Kroah-Hartman 1371ab4382d2SGreg Kroah-Hartman static void __uart_wait_until_sent(struct uart_port *port, int timeout) 1372ab4382d2SGreg Kroah-Hartman { 1373ab4382d2SGreg Kroah-Hartman unsigned long char_time, expire; 1374ab4382d2SGreg Kroah-Hartman 1375ab4382d2SGreg Kroah-Hartman if (port->type == PORT_UNKNOWN || port->fifosize == 0) 1376ab4382d2SGreg Kroah-Hartman return; 1377ab4382d2SGreg Kroah-Hartman 1378ab4382d2SGreg Kroah-Hartman /* 1379ab4382d2SGreg Kroah-Hartman * Set the check interval to be 1/5 of the estimated time to 1380ab4382d2SGreg Kroah-Hartman * send a single character, and make it at least 1. The check 1381ab4382d2SGreg Kroah-Hartman * interval should also be less than the timeout. 1382ab4382d2SGreg Kroah-Hartman * 1383ab4382d2SGreg Kroah-Hartman * Note: we have to use pretty tight timings here to satisfy 1384ab4382d2SGreg Kroah-Hartman * the NIST-PCTS. 1385ab4382d2SGreg Kroah-Hartman */ 1386ab4382d2SGreg Kroah-Hartman char_time = (port->timeout - HZ/50) / port->fifosize; 1387ab4382d2SGreg Kroah-Hartman char_time = char_time / 5; 1388ab4382d2SGreg Kroah-Hartman if (char_time == 0) 1389ab4382d2SGreg Kroah-Hartman char_time = 1; 1390ab4382d2SGreg Kroah-Hartman if (timeout && timeout < char_time) 1391ab4382d2SGreg Kroah-Hartman char_time = timeout; 1392ab4382d2SGreg Kroah-Hartman 1393ab4382d2SGreg Kroah-Hartman /* 1394ab4382d2SGreg Kroah-Hartman * If the transmitter hasn't cleared in twice the approximate 1395ab4382d2SGreg Kroah-Hartman * amount of time to send the entire FIFO, it probably won't 1396ab4382d2SGreg Kroah-Hartman * ever clear. This assumes the UART isn't doing flow 1397ab4382d2SGreg Kroah-Hartman * control, which is currently the case. Hence, if it ever 1398ab4382d2SGreg Kroah-Hartman * takes longer than port->timeout, this is probably due to a 1399ab4382d2SGreg Kroah-Hartman * UART bug of some kind. So, we clamp the timeout parameter at 1400ab4382d2SGreg Kroah-Hartman * 2*port->timeout. 1401ab4382d2SGreg Kroah-Hartman */ 1402ab4382d2SGreg Kroah-Hartman if (timeout == 0 || timeout > 2 * port->timeout) 1403ab4382d2SGreg Kroah-Hartman timeout = 2 * port->timeout; 1404ab4382d2SGreg Kroah-Hartman 1405ab4382d2SGreg Kroah-Hartman expire = jiffies + timeout; 1406ab4382d2SGreg Kroah-Hartman 1407ab4382d2SGreg Kroah-Hartman pr_debug("uart_wait_until_sent(%d), jiffies=%lu, expire=%lu...\n", 1408ab4382d2SGreg Kroah-Hartman port->line, jiffies, expire); 1409ab4382d2SGreg Kroah-Hartman 1410ab4382d2SGreg Kroah-Hartman /* 1411ab4382d2SGreg Kroah-Hartman * Check whether the transmitter is empty every 'char_time'. 1412ab4382d2SGreg Kroah-Hartman * 'timeout' / 'expire' give us the maximum amount of time 1413ab4382d2SGreg Kroah-Hartman * we wait. 1414ab4382d2SGreg Kroah-Hartman */ 1415ab4382d2SGreg Kroah-Hartman while (!port->ops->tx_empty(port)) { 1416ab4382d2SGreg Kroah-Hartman msleep_interruptible(jiffies_to_msecs(char_time)); 1417ab4382d2SGreg Kroah-Hartman if (signal_pending(current)) 1418ab4382d2SGreg Kroah-Hartman break; 1419ab4382d2SGreg Kroah-Hartman if (time_after(jiffies, expire)) 1420ab4382d2SGreg Kroah-Hartman break; 1421ab4382d2SGreg Kroah-Hartman } 1422ab4382d2SGreg Kroah-Hartman } 1423ab4382d2SGreg Kroah-Hartman 1424ab4382d2SGreg Kroah-Hartman static void uart_wait_until_sent(struct tty_struct *tty, int timeout) 1425ab4382d2SGreg Kroah-Hartman { 1426ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1427ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 1428ab4382d2SGreg Kroah-Hartman 1429ab4382d2SGreg Kroah-Hartman tty_lock(); 1430ab4382d2SGreg Kroah-Hartman __uart_wait_until_sent(port, timeout); 1431ab4382d2SGreg Kroah-Hartman tty_unlock(); 1432ab4382d2SGreg Kroah-Hartman } 1433ab4382d2SGreg Kroah-Hartman 1434ab4382d2SGreg Kroah-Hartman /* 1435ab4382d2SGreg Kroah-Hartman * This is called with the BKL held in 1436ab4382d2SGreg Kroah-Hartman * linux/drivers/char/tty_io.c:do_tty_hangup() 1437ab4382d2SGreg Kroah-Hartman * We're called from the eventd thread, so we can sleep for 1438ab4382d2SGreg Kroah-Hartman * a _short_ time only. 1439ab4382d2SGreg Kroah-Hartman */ 1440ab4382d2SGreg Kroah-Hartman static void uart_hangup(struct tty_struct *tty) 1441ab4382d2SGreg Kroah-Hartman { 1442ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1443ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1444ab4382d2SGreg Kroah-Hartman unsigned long flags; 1445ab4382d2SGreg Kroah-Hartman 1446ab4382d2SGreg Kroah-Hartman BUG_ON(!tty_locked()); 1447ab4382d2SGreg Kroah-Hartman pr_debug("uart_hangup(%d)\n", state->uart_port->line); 1448ab4382d2SGreg Kroah-Hartman 1449ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1450ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_NORMAL_ACTIVE) { 1451ab4382d2SGreg Kroah-Hartman uart_flush_buffer(tty); 1452ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 1453ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 1454ab4382d2SGreg Kroah-Hartman port->count = 0; 1455ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); 1456ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 1457ab4382d2SGreg Kroah-Hartman tty_port_tty_set(port, NULL); 1458ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->open_wait); 1459ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->delta_msr_wait); 1460ab4382d2SGreg Kroah-Hartman } 1461ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1462ab4382d2SGreg Kroah-Hartman } 1463ab4382d2SGreg Kroah-Hartman 1464ab4382d2SGreg Kroah-Hartman static int uart_carrier_raised(struct tty_port *port) 1465ab4382d2SGreg Kroah-Hartman { 1466ab4382d2SGreg Kroah-Hartman struct uart_state *state = container_of(port, struct uart_state, port); 1467ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1468ab4382d2SGreg Kroah-Hartman int mctrl; 1469ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1470ab4382d2SGreg Kroah-Hartman uport->ops->enable_ms(uport); 1471ab4382d2SGreg Kroah-Hartman mctrl = uport->ops->get_mctrl(uport); 1472ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1473ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_CAR) 1474ab4382d2SGreg Kroah-Hartman return 1; 1475ab4382d2SGreg Kroah-Hartman return 0; 1476ab4382d2SGreg Kroah-Hartman } 1477ab4382d2SGreg Kroah-Hartman 1478ab4382d2SGreg Kroah-Hartman static void uart_dtr_rts(struct tty_port *port, int onoff) 1479ab4382d2SGreg Kroah-Hartman { 1480ab4382d2SGreg Kroah-Hartman struct uart_state *state = container_of(port, struct uart_state, port); 1481ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1482ab4382d2SGreg Kroah-Hartman 14836f5c24adSJiri Slaby if (onoff) 1484ab4382d2SGreg Kroah-Hartman uart_set_mctrl(uport, TIOCM_DTR | TIOCM_RTS); 1485ab4382d2SGreg Kroah-Hartman else 1486ab4382d2SGreg Kroah-Hartman uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); 1487ab4382d2SGreg Kroah-Hartman } 1488ab4382d2SGreg Kroah-Hartman 1489ab4382d2SGreg Kroah-Hartman static struct uart_state *uart_get(struct uart_driver *drv, int line) 1490ab4382d2SGreg Kroah-Hartman { 1491ab4382d2SGreg Kroah-Hartman struct uart_state *state; 1492ab4382d2SGreg Kroah-Hartman struct tty_port *port; 1493ab4382d2SGreg Kroah-Hartman int ret = 0; 1494ab4382d2SGreg Kroah-Hartman 1495ab4382d2SGreg Kroah-Hartman state = drv->state + line; 1496ab4382d2SGreg Kroah-Hartman port = &state->port; 1497ab4382d2SGreg Kroah-Hartman if (mutex_lock_interruptible(&port->mutex)) { 1498ab4382d2SGreg Kroah-Hartman ret = -ERESTARTSYS; 1499ab4382d2SGreg Kroah-Hartman goto err; 1500ab4382d2SGreg Kroah-Hartman } 1501ab4382d2SGreg Kroah-Hartman 1502ab4382d2SGreg Kroah-Hartman port->count++; 1503ab4382d2SGreg Kroah-Hartman if (!state->uart_port || state->uart_port->flags & UPF_DEAD) { 1504ab4382d2SGreg Kroah-Hartman ret = -ENXIO; 1505ab4382d2SGreg Kroah-Hartman goto err_unlock; 1506ab4382d2SGreg Kroah-Hartman } 1507ab4382d2SGreg Kroah-Hartman return state; 1508ab4382d2SGreg Kroah-Hartman 1509ab4382d2SGreg Kroah-Hartman err_unlock: 1510ab4382d2SGreg Kroah-Hartman port->count--; 1511ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1512ab4382d2SGreg Kroah-Hartman err: 1513ab4382d2SGreg Kroah-Hartman return ERR_PTR(ret); 1514ab4382d2SGreg Kroah-Hartman } 1515ab4382d2SGreg Kroah-Hartman 1516ab4382d2SGreg Kroah-Hartman /* 1517ab4382d2SGreg Kroah-Hartman * calls to uart_open are serialised by the BKL in 1518ab4382d2SGreg Kroah-Hartman * fs/char_dev.c:chrdev_open() 1519ab4382d2SGreg Kroah-Hartman * Note that if this fails, then uart_close() _will_ be called. 1520ab4382d2SGreg Kroah-Hartman * 1521ab4382d2SGreg Kroah-Hartman * In time, we want to scrap the "opening nonpresent ports" 1522ab4382d2SGreg Kroah-Hartman * behaviour and implement an alternative way for setserial 1523ab4382d2SGreg Kroah-Hartman * to set base addresses/ports/types. This will allow us to 1524ab4382d2SGreg Kroah-Hartman * get rid of a certain amount of extra tests. 1525ab4382d2SGreg Kroah-Hartman */ 1526ab4382d2SGreg Kroah-Hartman static int uart_open(struct tty_struct *tty, struct file *filp) 1527ab4382d2SGreg Kroah-Hartman { 1528ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = (struct uart_driver *)tty->driver->driver_state; 1529ab4382d2SGreg Kroah-Hartman struct uart_state *state; 1530ab4382d2SGreg Kroah-Hartman struct tty_port *port; 1531ab4382d2SGreg Kroah-Hartman int retval, line = tty->index; 1532ab4382d2SGreg Kroah-Hartman 1533ab4382d2SGreg Kroah-Hartman BUG_ON(!tty_locked()); 1534ab4382d2SGreg Kroah-Hartman pr_debug("uart_open(%d) called\n", line); 1535ab4382d2SGreg Kroah-Hartman 1536ab4382d2SGreg Kroah-Hartman /* 1537ab4382d2SGreg Kroah-Hartman * We take the semaphore inside uart_get to guarantee that we won't 1538ab4382d2SGreg Kroah-Hartman * be re-entered while allocating the state structure, or while we 1539ab4382d2SGreg Kroah-Hartman * request any IRQs that the driver may need. This also has the nice 1540ab4382d2SGreg Kroah-Hartman * side-effect that it delays the action of uart_hangup, so we can 1541ab4382d2SGreg Kroah-Hartman * guarantee that state->port.tty will always contain something 1542ab4382d2SGreg Kroah-Hartman * reasonable. 1543ab4382d2SGreg Kroah-Hartman */ 1544ab4382d2SGreg Kroah-Hartman state = uart_get(drv, line); 1545ab4382d2SGreg Kroah-Hartman if (IS_ERR(state)) { 1546ab4382d2SGreg Kroah-Hartman retval = PTR_ERR(state); 1547ab4382d2SGreg Kroah-Hartman goto fail; 1548ab4382d2SGreg Kroah-Hartman } 1549ab4382d2SGreg Kroah-Hartman port = &state->port; 1550ab4382d2SGreg Kroah-Hartman 1551ab4382d2SGreg Kroah-Hartman /* 1552ab4382d2SGreg Kroah-Hartman * Once we set tty->driver_data here, we are guaranteed that 1553ab4382d2SGreg Kroah-Hartman * uart_close() will decrement the driver module use count. 1554ab4382d2SGreg Kroah-Hartman * Any failures from here onwards should not touch the count. 1555ab4382d2SGreg Kroah-Hartman */ 1556ab4382d2SGreg Kroah-Hartman tty->driver_data = state; 1557ab4382d2SGreg Kroah-Hartman state->uart_port->state = state; 1558ab4382d2SGreg Kroah-Hartman tty->low_latency = (state->uart_port->flags & UPF_LOW_LATENCY) ? 1 : 0; 1559ab4382d2SGreg Kroah-Hartman tty->alt_speed = 0; 1560ab4382d2SGreg Kroah-Hartman tty_port_tty_set(port, tty); 1561ab4382d2SGreg Kroah-Hartman 1562ab4382d2SGreg Kroah-Hartman /* 1563ab4382d2SGreg Kroah-Hartman * If the port is in the middle of closing, bail out now. 1564ab4382d2SGreg Kroah-Hartman */ 1565ab4382d2SGreg Kroah-Hartman if (tty_hung_up_p(filp)) { 1566ab4382d2SGreg Kroah-Hartman retval = -EAGAIN; 1567ab4382d2SGreg Kroah-Hartman port->count--; 1568ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1569ab4382d2SGreg Kroah-Hartman goto fail; 1570ab4382d2SGreg Kroah-Hartman } 1571ab4382d2SGreg Kroah-Hartman 1572ab4382d2SGreg Kroah-Hartman /* 1573ab4382d2SGreg Kroah-Hartman * Make sure the device is in D0 state. 1574ab4382d2SGreg Kroah-Hartman */ 1575ab4382d2SGreg Kroah-Hartman if (port->count == 1) 1576ab4382d2SGreg Kroah-Hartman uart_change_pm(state, 0); 1577ab4382d2SGreg Kroah-Hartman 1578ab4382d2SGreg Kroah-Hartman /* 1579ab4382d2SGreg Kroah-Hartman * Start up the serial port. 1580ab4382d2SGreg Kroah-Hartman */ 1581ab4382d2SGreg Kroah-Hartman retval = uart_startup(tty, state, 0); 1582ab4382d2SGreg Kroah-Hartman 1583ab4382d2SGreg Kroah-Hartman /* 1584ab4382d2SGreg Kroah-Hartman * If we succeeded, wait until the port is ready. 1585ab4382d2SGreg Kroah-Hartman */ 1586ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1587ab4382d2SGreg Kroah-Hartman if (retval == 0) 1588ab4382d2SGreg Kroah-Hartman retval = tty_port_block_til_ready(port, tty, filp); 1589ab4382d2SGreg Kroah-Hartman 1590ab4382d2SGreg Kroah-Hartman fail: 1591ab4382d2SGreg Kroah-Hartman return retval; 1592ab4382d2SGreg Kroah-Hartman } 1593ab4382d2SGreg Kroah-Hartman 1594ab4382d2SGreg Kroah-Hartman static const char *uart_type(struct uart_port *port) 1595ab4382d2SGreg Kroah-Hartman { 1596ab4382d2SGreg Kroah-Hartman const char *str = NULL; 1597ab4382d2SGreg Kroah-Hartman 1598ab4382d2SGreg Kroah-Hartman if (port->ops->type) 1599ab4382d2SGreg Kroah-Hartman str = port->ops->type(port); 1600ab4382d2SGreg Kroah-Hartman 1601ab4382d2SGreg Kroah-Hartman if (!str) 1602ab4382d2SGreg Kroah-Hartman str = "unknown"; 1603ab4382d2SGreg Kroah-Hartman 1604ab4382d2SGreg Kroah-Hartman return str; 1605ab4382d2SGreg Kroah-Hartman } 1606ab4382d2SGreg Kroah-Hartman 1607ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_PROC_FS 1608ab4382d2SGreg Kroah-Hartman 1609ab4382d2SGreg Kroah-Hartman static void uart_line_info(struct seq_file *m, struct uart_driver *drv, int i) 1610ab4382d2SGreg Kroah-Hartman { 1611ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + i; 1612ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1613ab4382d2SGreg Kroah-Hartman int pm_state; 1614ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1615ab4382d2SGreg Kroah-Hartman char stat_buf[32]; 1616ab4382d2SGreg Kroah-Hartman unsigned int status; 1617ab4382d2SGreg Kroah-Hartman int mmio; 1618ab4382d2SGreg Kroah-Hartman 1619ab4382d2SGreg Kroah-Hartman if (!uport) 1620ab4382d2SGreg Kroah-Hartman return; 1621ab4382d2SGreg Kroah-Hartman 1622ab4382d2SGreg Kroah-Hartman mmio = uport->iotype >= UPIO_MEM; 1623ab4382d2SGreg Kroah-Hartman seq_printf(m, "%d: uart:%s %s%08llX irq:%d", 1624ab4382d2SGreg Kroah-Hartman uport->line, uart_type(uport), 1625ab4382d2SGreg Kroah-Hartman mmio ? "mmio:0x" : "port:", 1626ab4382d2SGreg Kroah-Hartman mmio ? (unsigned long long)uport->mapbase 1627ab4382d2SGreg Kroah-Hartman : (unsigned long long)uport->iobase, 1628ab4382d2SGreg Kroah-Hartman uport->irq); 1629ab4382d2SGreg Kroah-Hartman 1630ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) { 1631ab4382d2SGreg Kroah-Hartman seq_putc(m, '\n'); 1632ab4382d2SGreg Kroah-Hartman return; 1633ab4382d2SGreg Kroah-Hartman } 1634ab4382d2SGreg Kroah-Hartman 1635ab4382d2SGreg Kroah-Hartman if (capable(CAP_SYS_ADMIN)) { 1636ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1637ab4382d2SGreg Kroah-Hartman pm_state = state->pm_state; 1638ab4382d2SGreg Kroah-Hartman if (pm_state) 1639ab4382d2SGreg Kroah-Hartman uart_change_pm(state, 0); 1640ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1641ab4382d2SGreg Kroah-Hartman status = uport->ops->get_mctrl(uport); 1642ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1643ab4382d2SGreg Kroah-Hartman if (pm_state) 1644ab4382d2SGreg Kroah-Hartman uart_change_pm(state, pm_state); 1645ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1646ab4382d2SGreg Kroah-Hartman 1647ab4382d2SGreg Kroah-Hartman seq_printf(m, " tx:%d rx:%d", 1648ab4382d2SGreg Kroah-Hartman uport->icount.tx, uport->icount.rx); 1649ab4382d2SGreg Kroah-Hartman if (uport->icount.frame) 1650ab4382d2SGreg Kroah-Hartman seq_printf(m, " fe:%d", 1651ab4382d2SGreg Kroah-Hartman uport->icount.frame); 1652ab4382d2SGreg Kroah-Hartman if (uport->icount.parity) 1653ab4382d2SGreg Kroah-Hartman seq_printf(m, " pe:%d", 1654ab4382d2SGreg Kroah-Hartman uport->icount.parity); 1655ab4382d2SGreg Kroah-Hartman if (uport->icount.brk) 1656ab4382d2SGreg Kroah-Hartman seq_printf(m, " brk:%d", 1657ab4382d2SGreg Kroah-Hartman uport->icount.brk); 1658ab4382d2SGreg Kroah-Hartman if (uport->icount.overrun) 1659ab4382d2SGreg Kroah-Hartman seq_printf(m, " oe:%d", 1660ab4382d2SGreg Kroah-Hartman uport->icount.overrun); 1661ab4382d2SGreg Kroah-Hartman 1662ab4382d2SGreg Kroah-Hartman #define INFOBIT(bit, str) \ 1663ab4382d2SGreg Kroah-Hartman if (uport->mctrl & (bit)) \ 1664ab4382d2SGreg Kroah-Hartman strncat(stat_buf, (str), sizeof(stat_buf) - \ 1665ab4382d2SGreg Kroah-Hartman strlen(stat_buf) - 2) 1666ab4382d2SGreg Kroah-Hartman #define STATBIT(bit, str) \ 1667ab4382d2SGreg Kroah-Hartman if (status & (bit)) \ 1668ab4382d2SGreg Kroah-Hartman strncat(stat_buf, (str), sizeof(stat_buf) - \ 1669ab4382d2SGreg Kroah-Hartman strlen(stat_buf) - 2) 1670ab4382d2SGreg Kroah-Hartman 1671ab4382d2SGreg Kroah-Hartman stat_buf[0] = '\0'; 1672ab4382d2SGreg Kroah-Hartman stat_buf[1] = '\0'; 1673ab4382d2SGreg Kroah-Hartman INFOBIT(TIOCM_RTS, "|RTS"); 1674ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_CTS, "|CTS"); 1675ab4382d2SGreg Kroah-Hartman INFOBIT(TIOCM_DTR, "|DTR"); 1676ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_DSR, "|DSR"); 1677ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_CAR, "|CD"); 1678ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_RNG, "|RI"); 1679ab4382d2SGreg Kroah-Hartman if (stat_buf[0]) 1680ab4382d2SGreg Kroah-Hartman stat_buf[0] = ' '; 1681ab4382d2SGreg Kroah-Hartman 1682ab4382d2SGreg Kroah-Hartman seq_puts(m, stat_buf); 1683ab4382d2SGreg Kroah-Hartman } 1684ab4382d2SGreg Kroah-Hartman seq_putc(m, '\n'); 1685ab4382d2SGreg Kroah-Hartman #undef STATBIT 1686ab4382d2SGreg Kroah-Hartman #undef INFOBIT 1687ab4382d2SGreg Kroah-Hartman } 1688ab4382d2SGreg Kroah-Hartman 1689ab4382d2SGreg Kroah-Hartman static int uart_proc_show(struct seq_file *m, void *v) 1690ab4382d2SGreg Kroah-Hartman { 1691ab4382d2SGreg Kroah-Hartman struct tty_driver *ttydrv = m->private; 1692ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = ttydrv->driver_state; 1693ab4382d2SGreg Kroah-Hartman int i; 1694ab4382d2SGreg Kroah-Hartman 1695ab4382d2SGreg Kroah-Hartman seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n", 1696ab4382d2SGreg Kroah-Hartman "", "", ""); 1697ab4382d2SGreg Kroah-Hartman for (i = 0; i < drv->nr; i++) 1698ab4382d2SGreg Kroah-Hartman uart_line_info(m, drv, i); 1699ab4382d2SGreg Kroah-Hartman return 0; 1700ab4382d2SGreg Kroah-Hartman } 1701ab4382d2SGreg Kroah-Hartman 1702ab4382d2SGreg Kroah-Hartman static int uart_proc_open(struct inode *inode, struct file *file) 1703ab4382d2SGreg Kroah-Hartman { 1704ab4382d2SGreg Kroah-Hartman return single_open(file, uart_proc_show, PDE(inode)->data); 1705ab4382d2SGreg Kroah-Hartman } 1706ab4382d2SGreg Kroah-Hartman 1707ab4382d2SGreg Kroah-Hartman static const struct file_operations uart_proc_fops = { 1708ab4382d2SGreg Kroah-Hartman .owner = THIS_MODULE, 1709ab4382d2SGreg Kroah-Hartman .open = uart_proc_open, 1710ab4382d2SGreg Kroah-Hartman .read = seq_read, 1711ab4382d2SGreg Kroah-Hartman .llseek = seq_lseek, 1712ab4382d2SGreg Kroah-Hartman .release = single_release, 1713ab4382d2SGreg Kroah-Hartman }; 1714ab4382d2SGreg Kroah-Hartman #endif 1715ab4382d2SGreg Kroah-Hartman 1716ab4382d2SGreg Kroah-Hartman #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL) 1717ab4382d2SGreg Kroah-Hartman /* 1718ab4382d2SGreg Kroah-Hartman * uart_console_write - write a console message to a serial port 1719ab4382d2SGreg Kroah-Hartman * @port: the port to write the message 1720ab4382d2SGreg Kroah-Hartman * @s: array of characters 1721ab4382d2SGreg Kroah-Hartman * @count: number of characters in string to write 1722ab4382d2SGreg Kroah-Hartman * @write: function to write character to port 1723ab4382d2SGreg Kroah-Hartman */ 1724ab4382d2SGreg Kroah-Hartman void uart_console_write(struct uart_port *port, const char *s, 1725ab4382d2SGreg Kroah-Hartman unsigned int count, 1726ab4382d2SGreg Kroah-Hartman void (*putchar)(struct uart_port *, int)) 1727ab4382d2SGreg Kroah-Hartman { 1728ab4382d2SGreg Kroah-Hartman unsigned int i; 1729ab4382d2SGreg Kroah-Hartman 1730ab4382d2SGreg Kroah-Hartman for (i = 0; i < count; i++, s++) { 1731ab4382d2SGreg Kroah-Hartman if (*s == '\n') 1732ab4382d2SGreg Kroah-Hartman putchar(port, '\r'); 1733ab4382d2SGreg Kroah-Hartman putchar(port, *s); 1734ab4382d2SGreg Kroah-Hartman } 1735ab4382d2SGreg Kroah-Hartman } 1736ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_console_write); 1737ab4382d2SGreg Kroah-Hartman 1738ab4382d2SGreg Kroah-Hartman /* 1739ab4382d2SGreg Kroah-Hartman * Check whether an invalid uart number has been specified, and 1740ab4382d2SGreg Kroah-Hartman * if so, search for the first available port that does have 1741ab4382d2SGreg Kroah-Hartman * console support. 1742ab4382d2SGreg Kroah-Hartman */ 1743ab4382d2SGreg Kroah-Hartman struct uart_port * __init 1744ab4382d2SGreg Kroah-Hartman uart_get_console(struct uart_port *ports, int nr, struct console *co) 1745ab4382d2SGreg Kroah-Hartman { 1746ab4382d2SGreg Kroah-Hartman int idx = co->index; 1747ab4382d2SGreg Kroah-Hartman 1748ab4382d2SGreg Kroah-Hartman if (idx < 0 || idx >= nr || (ports[idx].iobase == 0 && 1749ab4382d2SGreg Kroah-Hartman ports[idx].membase == NULL)) 1750ab4382d2SGreg Kroah-Hartman for (idx = 0; idx < nr; idx++) 1751ab4382d2SGreg Kroah-Hartman if (ports[idx].iobase != 0 || 1752ab4382d2SGreg Kroah-Hartman ports[idx].membase != NULL) 1753ab4382d2SGreg Kroah-Hartman break; 1754ab4382d2SGreg Kroah-Hartman 1755ab4382d2SGreg Kroah-Hartman co->index = idx; 1756ab4382d2SGreg Kroah-Hartman 1757ab4382d2SGreg Kroah-Hartman return ports + idx; 1758ab4382d2SGreg Kroah-Hartman } 1759ab4382d2SGreg Kroah-Hartman 1760ab4382d2SGreg Kroah-Hartman /** 1761ab4382d2SGreg Kroah-Hartman * uart_parse_options - Parse serial port baud/parity/bits/flow contro. 1762ab4382d2SGreg Kroah-Hartman * @options: pointer to option string 1763ab4382d2SGreg Kroah-Hartman * @baud: pointer to an 'int' variable for the baud rate. 1764ab4382d2SGreg Kroah-Hartman * @parity: pointer to an 'int' variable for the parity. 1765ab4382d2SGreg Kroah-Hartman * @bits: pointer to an 'int' variable for the number of data bits. 1766ab4382d2SGreg Kroah-Hartman * @flow: pointer to an 'int' variable for the flow control character. 1767ab4382d2SGreg Kroah-Hartman * 1768ab4382d2SGreg Kroah-Hartman * uart_parse_options decodes a string containing the serial console 1769ab4382d2SGreg Kroah-Hartman * options. The format of the string is <baud><parity><bits><flow>, 1770ab4382d2SGreg Kroah-Hartman * eg: 115200n8r 1771ab4382d2SGreg Kroah-Hartman */ 1772ab4382d2SGreg Kroah-Hartman void 1773ab4382d2SGreg Kroah-Hartman uart_parse_options(char *options, int *baud, int *parity, int *bits, int *flow) 1774ab4382d2SGreg Kroah-Hartman { 1775ab4382d2SGreg Kroah-Hartman char *s = options; 1776ab4382d2SGreg Kroah-Hartman 1777ab4382d2SGreg Kroah-Hartman *baud = simple_strtoul(s, NULL, 10); 1778ab4382d2SGreg Kroah-Hartman while (*s >= '0' && *s <= '9') 1779ab4382d2SGreg Kroah-Hartman s++; 1780ab4382d2SGreg Kroah-Hartman if (*s) 1781ab4382d2SGreg Kroah-Hartman *parity = *s++; 1782ab4382d2SGreg Kroah-Hartman if (*s) 1783ab4382d2SGreg Kroah-Hartman *bits = *s++ - '0'; 1784ab4382d2SGreg Kroah-Hartman if (*s) 1785ab4382d2SGreg Kroah-Hartman *flow = *s; 1786ab4382d2SGreg Kroah-Hartman } 1787ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_parse_options); 1788ab4382d2SGreg Kroah-Hartman 1789ab4382d2SGreg Kroah-Hartman struct baud_rates { 1790ab4382d2SGreg Kroah-Hartman unsigned int rate; 1791ab4382d2SGreg Kroah-Hartman unsigned int cflag; 1792ab4382d2SGreg Kroah-Hartman }; 1793ab4382d2SGreg Kroah-Hartman 1794ab4382d2SGreg Kroah-Hartman static const struct baud_rates baud_rates[] = { 1795ab4382d2SGreg Kroah-Hartman { 921600, B921600 }, 1796ab4382d2SGreg Kroah-Hartman { 460800, B460800 }, 1797ab4382d2SGreg Kroah-Hartman { 230400, B230400 }, 1798ab4382d2SGreg Kroah-Hartman { 115200, B115200 }, 1799ab4382d2SGreg Kroah-Hartman { 57600, B57600 }, 1800ab4382d2SGreg Kroah-Hartman { 38400, B38400 }, 1801ab4382d2SGreg Kroah-Hartman { 19200, B19200 }, 1802ab4382d2SGreg Kroah-Hartman { 9600, B9600 }, 1803ab4382d2SGreg Kroah-Hartman { 4800, B4800 }, 1804ab4382d2SGreg Kroah-Hartman { 2400, B2400 }, 1805ab4382d2SGreg Kroah-Hartman { 1200, B1200 }, 1806ab4382d2SGreg Kroah-Hartman { 0, B38400 } 1807ab4382d2SGreg Kroah-Hartman }; 1808ab4382d2SGreg Kroah-Hartman 1809ab4382d2SGreg Kroah-Hartman /** 1810ab4382d2SGreg Kroah-Hartman * uart_set_options - setup the serial console parameters 1811ab4382d2SGreg Kroah-Hartman * @port: pointer to the serial ports uart_port structure 1812ab4382d2SGreg Kroah-Hartman * @co: console pointer 1813ab4382d2SGreg Kroah-Hartman * @baud: baud rate 1814ab4382d2SGreg Kroah-Hartman * @parity: parity character - 'n' (none), 'o' (odd), 'e' (even) 1815ab4382d2SGreg Kroah-Hartman * @bits: number of data bits 1816ab4382d2SGreg Kroah-Hartman * @flow: flow control character - 'r' (rts) 1817ab4382d2SGreg Kroah-Hartman */ 1818ab4382d2SGreg Kroah-Hartman int 1819ab4382d2SGreg Kroah-Hartman uart_set_options(struct uart_port *port, struct console *co, 1820ab4382d2SGreg Kroah-Hartman int baud, int parity, int bits, int flow) 1821ab4382d2SGreg Kroah-Hartman { 1822ab4382d2SGreg Kroah-Hartman struct ktermios termios; 1823ab4382d2SGreg Kroah-Hartman static struct ktermios dummy; 1824ab4382d2SGreg Kroah-Hartman int i; 1825ab4382d2SGreg Kroah-Hartman 1826ab4382d2SGreg Kroah-Hartman /* 1827ab4382d2SGreg Kroah-Hartman * Ensure that the serial console lock is initialised 1828ab4382d2SGreg Kroah-Hartman * early. 1829ab4382d2SGreg Kroah-Hartman */ 1830ab4382d2SGreg Kroah-Hartman spin_lock_init(&port->lock); 1831ab4382d2SGreg Kroah-Hartman lockdep_set_class(&port->lock, &port_lock_key); 1832ab4382d2SGreg Kroah-Hartman 1833ab4382d2SGreg Kroah-Hartman memset(&termios, 0, sizeof(struct ktermios)); 1834ab4382d2SGreg Kroah-Hartman 1835ab4382d2SGreg Kroah-Hartman termios.c_cflag = CREAD | HUPCL | CLOCAL; 1836ab4382d2SGreg Kroah-Hartman 1837ab4382d2SGreg Kroah-Hartman /* 1838ab4382d2SGreg Kroah-Hartman * Construct a cflag setting. 1839ab4382d2SGreg Kroah-Hartman */ 1840ab4382d2SGreg Kroah-Hartman for (i = 0; baud_rates[i].rate; i++) 1841ab4382d2SGreg Kroah-Hartman if (baud_rates[i].rate <= baud) 1842ab4382d2SGreg Kroah-Hartman break; 1843ab4382d2SGreg Kroah-Hartman 1844ab4382d2SGreg Kroah-Hartman termios.c_cflag |= baud_rates[i].cflag; 1845ab4382d2SGreg Kroah-Hartman 1846ab4382d2SGreg Kroah-Hartman if (bits == 7) 1847ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CS7; 1848ab4382d2SGreg Kroah-Hartman else 1849ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CS8; 1850ab4382d2SGreg Kroah-Hartman 1851ab4382d2SGreg Kroah-Hartman switch (parity) { 1852ab4382d2SGreg Kroah-Hartman case 'o': case 'O': 1853ab4382d2SGreg Kroah-Hartman termios.c_cflag |= PARODD; 1854ab4382d2SGreg Kroah-Hartman /*fall through*/ 1855ab4382d2SGreg Kroah-Hartman case 'e': case 'E': 1856ab4382d2SGreg Kroah-Hartman termios.c_cflag |= PARENB; 1857ab4382d2SGreg Kroah-Hartman break; 1858ab4382d2SGreg Kroah-Hartman } 1859ab4382d2SGreg Kroah-Hartman 1860ab4382d2SGreg Kroah-Hartman if (flow == 'r') 1861ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CRTSCTS; 1862ab4382d2SGreg Kroah-Hartman 1863ab4382d2SGreg Kroah-Hartman /* 1864ab4382d2SGreg Kroah-Hartman * some uarts on other side don't support no flow control. 1865ab4382d2SGreg Kroah-Hartman * So we set * DTR in host uart to make them happy 1866ab4382d2SGreg Kroah-Hartman */ 1867ab4382d2SGreg Kroah-Hartman port->mctrl |= TIOCM_DTR; 1868ab4382d2SGreg Kroah-Hartman 1869ab4382d2SGreg Kroah-Hartman port->ops->set_termios(port, &termios, &dummy); 1870ab4382d2SGreg Kroah-Hartman /* 1871ab4382d2SGreg Kroah-Hartman * Allow the setting of the UART parameters with a NULL console 1872ab4382d2SGreg Kroah-Hartman * too: 1873ab4382d2SGreg Kroah-Hartman */ 1874ab4382d2SGreg Kroah-Hartman if (co) 1875ab4382d2SGreg Kroah-Hartman co->cflag = termios.c_cflag; 1876ab4382d2SGreg Kroah-Hartman 1877ab4382d2SGreg Kroah-Hartman return 0; 1878ab4382d2SGreg Kroah-Hartman } 1879ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_set_options); 1880ab4382d2SGreg Kroah-Hartman #endif /* CONFIG_SERIAL_CORE_CONSOLE */ 1881ab4382d2SGreg Kroah-Hartman 1882ab4382d2SGreg Kroah-Hartman static void uart_change_pm(struct uart_state *state, int pm_state) 1883ab4382d2SGreg Kroah-Hartman { 1884ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 1885ab4382d2SGreg Kroah-Hartman 1886ab4382d2SGreg Kroah-Hartman if (state->pm_state != pm_state) { 1887ab4382d2SGreg Kroah-Hartman if (port->ops->pm) 1888ab4382d2SGreg Kroah-Hartman port->ops->pm(port, pm_state, state->pm_state); 1889ab4382d2SGreg Kroah-Hartman state->pm_state = pm_state; 1890ab4382d2SGreg Kroah-Hartman } 1891ab4382d2SGreg Kroah-Hartman } 1892ab4382d2SGreg Kroah-Hartman 1893ab4382d2SGreg Kroah-Hartman struct uart_match { 1894ab4382d2SGreg Kroah-Hartman struct uart_port *port; 1895ab4382d2SGreg Kroah-Hartman struct uart_driver *driver; 1896ab4382d2SGreg Kroah-Hartman }; 1897ab4382d2SGreg Kroah-Hartman 1898ab4382d2SGreg Kroah-Hartman static int serial_match_port(struct device *dev, void *data) 1899ab4382d2SGreg Kroah-Hartman { 1900ab4382d2SGreg Kroah-Hartman struct uart_match *match = data; 1901ab4382d2SGreg Kroah-Hartman struct tty_driver *tty_drv = match->driver->tty_driver; 1902ab4382d2SGreg Kroah-Hartman dev_t devt = MKDEV(tty_drv->major, tty_drv->minor_start) + 1903ab4382d2SGreg Kroah-Hartman match->port->line; 1904ab4382d2SGreg Kroah-Hartman 1905ab4382d2SGreg Kroah-Hartman return dev->devt == devt; /* Actually, only one tty per port */ 1906ab4382d2SGreg Kroah-Hartman } 1907ab4382d2SGreg Kroah-Hartman 1908ab4382d2SGreg Kroah-Hartman int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport) 1909ab4382d2SGreg Kroah-Hartman { 1910ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 1911ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1912ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 1913ab4382d2SGreg Kroah-Hartman struct uart_match match = {uport, drv}; 1914ab4382d2SGreg Kroah-Hartman 1915ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1916ab4382d2SGreg Kroah-Hartman 1917ab4382d2SGreg Kroah-Hartman tty_dev = device_find_child(uport->dev, &match, serial_match_port); 1918ab4382d2SGreg Kroah-Hartman if (device_may_wakeup(tty_dev)) { 1919ab4382d2SGreg Kroah-Hartman if (!enable_irq_wake(uport->irq)) 1920ab4382d2SGreg Kroah-Hartman uport->irq_wake = 1; 1921ab4382d2SGreg Kroah-Hartman put_device(tty_dev); 1922ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1923ab4382d2SGreg Kroah-Hartman return 0; 1924ab4382d2SGreg Kroah-Hartman } 1925ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) 1926ab4382d2SGreg Kroah-Hartman uport->suspended = 1; 1927ab4382d2SGreg Kroah-Hartman 1928ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_INITIALIZED) { 1929ab4382d2SGreg Kroah-Hartman const struct uart_ops *ops = uport->ops; 1930ab4382d2SGreg Kroah-Hartman int tries; 1931ab4382d2SGreg Kroah-Hartman 1932ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) { 1933ab4382d2SGreg Kroah-Hartman set_bit(ASYNCB_SUSPENDED, &port->flags); 1934ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_INITIALIZED, &port->flags); 1935ab4382d2SGreg Kroah-Hartman 1936ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1937ab4382d2SGreg Kroah-Hartman ops->stop_tx(uport); 1938ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, 0); 1939ab4382d2SGreg Kroah-Hartman ops->stop_rx(uport); 1940ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1941ab4382d2SGreg Kroah-Hartman } 1942ab4382d2SGreg Kroah-Hartman 1943ab4382d2SGreg Kroah-Hartman /* 1944ab4382d2SGreg Kroah-Hartman * Wait for the transmitter to empty. 1945ab4382d2SGreg Kroah-Hartman */ 1946ab4382d2SGreg Kroah-Hartman for (tries = 3; !ops->tx_empty(uport) && tries; tries--) 1947ab4382d2SGreg Kroah-Hartman msleep(10); 1948ab4382d2SGreg Kroah-Hartman if (!tries) 1949ab4382d2SGreg Kroah-Hartman printk(KERN_ERR "%s%s%s%d: Unable to drain " 1950ab4382d2SGreg Kroah-Hartman "transmitter\n", 1951ab4382d2SGreg Kroah-Hartman uport->dev ? dev_name(uport->dev) : "", 1952ab4382d2SGreg Kroah-Hartman uport->dev ? ": " : "", 1953ab4382d2SGreg Kroah-Hartman drv->dev_name, 1954ab4382d2SGreg Kroah-Hartman drv->tty_driver->name_base + uport->line); 1955ab4382d2SGreg Kroah-Hartman 1956ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) 1957ab4382d2SGreg Kroah-Hartman ops->shutdown(uport); 1958ab4382d2SGreg Kroah-Hartman } 1959ab4382d2SGreg Kroah-Hartman 1960ab4382d2SGreg Kroah-Hartman /* 1961ab4382d2SGreg Kroah-Hartman * Disable the console device before suspending. 1962ab4382d2SGreg Kroah-Hartman */ 1963ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled && uart_console(uport)) 1964ab4382d2SGreg Kroah-Hartman console_stop(uport->cons); 1965ab4382d2SGreg Kroah-Hartman 1966ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) 1967ab4382d2SGreg Kroah-Hartman uart_change_pm(state, 3); 1968ab4382d2SGreg Kroah-Hartman 1969ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1970ab4382d2SGreg Kroah-Hartman 1971ab4382d2SGreg Kroah-Hartman return 0; 1972ab4382d2SGreg Kroah-Hartman } 1973ab4382d2SGreg Kroah-Hartman 1974ab4382d2SGreg Kroah-Hartman int uart_resume_port(struct uart_driver *drv, struct uart_port *uport) 1975ab4382d2SGreg Kroah-Hartman { 1976ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 1977ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1978ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 1979ab4382d2SGreg Kroah-Hartman struct uart_match match = {uport, drv}; 1980ab4382d2SGreg Kroah-Hartman struct ktermios termios; 1981ab4382d2SGreg Kroah-Hartman 1982ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1983ab4382d2SGreg Kroah-Hartman 1984ab4382d2SGreg Kroah-Hartman tty_dev = device_find_child(uport->dev, &match, serial_match_port); 1985ab4382d2SGreg Kroah-Hartman if (!uport->suspended && device_may_wakeup(tty_dev)) { 1986ab4382d2SGreg Kroah-Hartman if (uport->irq_wake) { 1987ab4382d2SGreg Kroah-Hartman disable_irq_wake(uport->irq); 1988ab4382d2SGreg Kroah-Hartman uport->irq_wake = 0; 1989ab4382d2SGreg Kroah-Hartman } 1990ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1991ab4382d2SGreg Kroah-Hartman return 0; 1992ab4382d2SGreg Kroah-Hartman } 1993ab4382d2SGreg Kroah-Hartman uport->suspended = 0; 1994ab4382d2SGreg Kroah-Hartman 1995ab4382d2SGreg Kroah-Hartman /* 1996ab4382d2SGreg Kroah-Hartman * Re-enable the console device after suspending. 1997ab4382d2SGreg Kroah-Hartman */ 19985933a161SYin Kangkai if (uart_console(uport)) { 1999ab4382d2SGreg Kroah-Hartman /* 2000ab4382d2SGreg Kroah-Hartman * First try to use the console cflag setting. 2001ab4382d2SGreg Kroah-Hartman */ 2002ab4382d2SGreg Kroah-Hartman memset(&termios, 0, sizeof(struct ktermios)); 2003ab4382d2SGreg Kroah-Hartman termios.c_cflag = uport->cons->cflag; 2004ab4382d2SGreg Kroah-Hartman 2005ab4382d2SGreg Kroah-Hartman /* 2006ab4382d2SGreg Kroah-Hartman * If that's unset, use the tty termios setting. 2007ab4382d2SGreg Kroah-Hartman */ 2008ab4382d2SGreg Kroah-Hartman if (port->tty && port->tty->termios && termios.c_cflag == 0) 2009ab4382d2SGreg Kroah-Hartman termios = *(port->tty->termios); 2010ab4382d2SGreg Kroah-Hartman 2011ab4382d2SGreg Kroah-Hartman uport->ops->set_termios(uport, &termios, NULL); 20125933a161SYin Kangkai if (console_suspend_enabled) 2013ab4382d2SGreg Kroah-Hartman console_start(uport->cons); 2014ab4382d2SGreg Kroah-Hartman } 2015ab4382d2SGreg Kroah-Hartman 2016ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_SUSPENDED) { 2017ab4382d2SGreg Kroah-Hartman const struct uart_ops *ops = uport->ops; 2018ab4382d2SGreg Kroah-Hartman int ret; 2019ab4382d2SGreg Kroah-Hartman 2020ab4382d2SGreg Kroah-Hartman uart_change_pm(state, 0); 2021ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 2022ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, 0); 2023ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2024ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) { 2025ab4382d2SGreg Kroah-Hartman /* Protected by port mutex for now */ 2026ab4382d2SGreg Kroah-Hartman struct tty_struct *tty = port->tty; 2027ab4382d2SGreg Kroah-Hartman ret = ops->startup(uport); 2028ab4382d2SGreg Kroah-Hartman if (ret == 0) { 2029ab4382d2SGreg Kroah-Hartman if (tty) 2030ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 2031ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 2032ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, uport->mctrl); 2033ab4382d2SGreg Kroah-Hartman ops->start_tx(uport); 2034ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2035ab4382d2SGreg Kroah-Hartman set_bit(ASYNCB_INITIALIZED, &port->flags); 2036ab4382d2SGreg Kroah-Hartman } else { 2037ab4382d2SGreg Kroah-Hartman /* 2038ab4382d2SGreg Kroah-Hartman * Failed to resume - maybe hardware went away? 2039ab4382d2SGreg Kroah-Hartman * Clear the "initialized" flag so we won't try 2040ab4382d2SGreg Kroah-Hartman * to call the low level drivers shutdown method. 2041ab4382d2SGreg Kroah-Hartman */ 2042ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 2043ab4382d2SGreg Kroah-Hartman } 2044ab4382d2SGreg Kroah-Hartman } 2045ab4382d2SGreg Kroah-Hartman 2046ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_SUSPENDED, &port->flags); 2047ab4382d2SGreg Kroah-Hartman } 2048ab4382d2SGreg Kroah-Hartman 2049ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2050ab4382d2SGreg Kroah-Hartman 2051ab4382d2SGreg Kroah-Hartman return 0; 2052ab4382d2SGreg Kroah-Hartman } 2053ab4382d2SGreg Kroah-Hartman 2054ab4382d2SGreg Kroah-Hartman static inline void 2055ab4382d2SGreg Kroah-Hartman uart_report_port(struct uart_driver *drv, struct uart_port *port) 2056ab4382d2SGreg Kroah-Hartman { 2057ab4382d2SGreg Kroah-Hartman char address[64]; 2058ab4382d2SGreg Kroah-Hartman 2059ab4382d2SGreg Kroah-Hartman switch (port->iotype) { 2060ab4382d2SGreg Kroah-Hartman case UPIO_PORT: 2061ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), "I/O 0x%lx", port->iobase); 2062ab4382d2SGreg Kroah-Hartman break; 2063ab4382d2SGreg Kroah-Hartman case UPIO_HUB6: 2064ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), 2065ab4382d2SGreg Kroah-Hartman "I/O 0x%lx offset 0x%x", port->iobase, port->hub6); 2066ab4382d2SGreg Kroah-Hartman break; 2067ab4382d2SGreg Kroah-Hartman case UPIO_MEM: 2068ab4382d2SGreg Kroah-Hartman case UPIO_MEM32: 2069ab4382d2SGreg Kroah-Hartman case UPIO_AU: 2070ab4382d2SGreg Kroah-Hartman case UPIO_TSI: 2071ab4382d2SGreg Kroah-Hartman case UPIO_DWAPB: 2072ab4382d2SGreg Kroah-Hartman case UPIO_DWAPB32: 2073ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), 2074ab4382d2SGreg Kroah-Hartman "MMIO 0x%llx", (unsigned long long)port->mapbase); 2075ab4382d2SGreg Kroah-Hartman break; 2076ab4382d2SGreg Kroah-Hartman default: 2077ab4382d2SGreg Kroah-Hartman strlcpy(address, "*unknown*", sizeof(address)); 2078ab4382d2SGreg Kroah-Hartman break; 2079ab4382d2SGreg Kroah-Hartman } 2080ab4382d2SGreg Kroah-Hartman 2081ab4382d2SGreg Kroah-Hartman printk(KERN_INFO "%s%s%s%d at %s (irq = %d) is a %s\n", 2082ab4382d2SGreg Kroah-Hartman port->dev ? dev_name(port->dev) : "", 2083ab4382d2SGreg Kroah-Hartman port->dev ? ": " : "", 2084ab4382d2SGreg Kroah-Hartman drv->dev_name, 2085ab4382d2SGreg Kroah-Hartman drv->tty_driver->name_base + port->line, 2086ab4382d2SGreg Kroah-Hartman address, port->irq, uart_type(port)); 2087ab4382d2SGreg Kroah-Hartman } 2088ab4382d2SGreg Kroah-Hartman 2089ab4382d2SGreg Kroah-Hartman static void 2090ab4382d2SGreg Kroah-Hartman uart_configure_port(struct uart_driver *drv, struct uart_state *state, 2091ab4382d2SGreg Kroah-Hartman struct uart_port *port) 2092ab4382d2SGreg Kroah-Hartman { 2093ab4382d2SGreg Kroah-Hartman unsigned int flags; 2094ab4382d2SGreg Kroah-Hartman 2095ab4382d2SGreg Kroah-Hartman /* 2096ab4382d2SGreg Kroah-Hartman * If there isn't a port here, don't do anything further. 2097ab4382d2SGreg Kroah-Hartman */ 2098ab4382d2SGreg Kroah-Hartman if (!port->iobase && !port->mapbase && !port->membase) 2099ab4382d2SGreg Kroah-Hartman return; 2100ab4382d2SGreg Kroah-Hartman 2101ab4382d2SGreg Kroah-Hartman /* 2102ab4382d2SGreg Kroah-Hartman * Now do the auto configuration stuff. Note that config_port 2103ab4382d2SGreg Kroah-Hartman * is expected to claim the resources and map the port for us. 2104ab4382d2SGreg Kroah-Hartman */ 2105ab4382d2SGreg Kroah-Hartman flags = 0; 2106ab4382d2SGreg Kroah-Hartman if (port->flags & UPF_AUTO_IRQ) 2107ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_IRQ; 2108ab4382d2SGreg Kroah-Hartman if (port->flags & UPF_BOOT_AUTOCONF) { 2109ab4382d2SGreg Kroah-Hartman if (!(port->flags & UPF_FIXED_TYPE)) { 2110ab4382d2SGreg Kroah-Hartman port->type = PORT_UNKNOWN; 2111ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_TYPE; 2112ab4382d2SGreg Kroah-Hartman } 2113ab4382d2SGreg Kroah-Hartman port->ops->config_port(port, flags); 2114ab4382d2SGreg Kroah-Hartman } 2115ab4382d2SGreg Kroah-Hartman 2116ab4382d2SGreg Kroah-Hartman if (port->type != PORT_UNKNOWN) { 2117ab4382d2SGreg Kroah-Hartman unsigned long flags; 2118ab4382d2SGreg Kroah-Hartman 2119ab4382d2SGreg Kroah-Hartman uart_report_port(drv, port); 2120ab4382d2SGreg Kroah-Hartman 2121ab4382d2SGreg Kroah-Hartman /* Power up port for set_mctrl() */ 2122ab4382d2SGreg Kroah-Hartman uart_change_pm(state, 0); 2123ab4382d2SGreg Kroah-Hartman 2124ab4382d2SGreg Kroah-Hartman /* 2125ab4382d2SGreg Kroah-Hartman * Ensure that the modem control lines are de-activated. 2126ab4382d2SGreg Kroah-Hartman * keep the DTR setting that is set in uart_set_options() 2127ab4382d2SGreg Kroah-Hartman * We probably don't need a spinlock around this, but 2128ab4382d2SGreg Kroah-Hartman */ 2129ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 2130ab4382d2SGreg Kroah-Hartman port->ops->set_mctrl(port, port->mctrl & TIOCM_DTR); 2131ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 2132ab4382d2SGreg Kroah-Hartman 2133ab4382d2SGreg Kroah-Hartman /* 2134ab4382d2SGreg Kroah-Hartman * If this driver supports console, and it hasn't been 2135ab4382d2SGreg Kroah-Hartman * successfully registered yet, try to re-register it. 2136ab4382d2SGreg Kroah-Hartman * It may be that the port was not available. 2137ab4382d2SGreg Kroah-Hartman */ 2138ab4382d2SGreg Kroah-Hartman if (port->cons && !(port->cons->flags & CON_ENABLED)) 2139ab4382d2SGreg Kroah-Hartman register_console(port->cons); 2140ab4382d2SGreg Kroah-Hartman 2141ab4382d2SGreg Kroah-Hartman /* 2142ab4382d2SGreg Kroah-Hartman * Power down all ports by default, except the 2143ab4382d2SGreg Kroah-Hartman * console if we have one. 2144ab4382d2SGreg Kroah-Hartman */ 2145ab4382d2SGreg Kroah-Hartman if (!uart_console(port)) 2146ab4382d2SGreg Kroah-Hartman uart_change_pm(state, 3); 2147ab4382d2SGreg Kroah-Hartman } 2148ab4382d2SGreg Kroah-Hartman } 2149ab4382d2SGreg Kroah-Hartman 2150ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 2151ab4382d2SGreg Kroah-Hartman 2152ab4382d2SGreg Kroah-Hartman static int uart_poll_init(struct tty_driver *driver, int line, char *options) 2153ab4382d2SGreg Kroah-Hartman { 2154ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2155ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2156ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2157ab4382d2SGreg Kroah-Hartman int baud = 9600; 2158ab4382d2SGreg Kroah-Hartman int bits = 8; 2159ab4382d2SGreg Kroah-Hartman int parity = 'n'; 2160ab4382d2SGreg Kroah-Hartman int flow = 'n'; 2161ab4382d2SGreg Kroah-Hartman 2162ab4382d2SGreg Kroah-Hartman if (!state || !state->uart_port) 2163ab4382d2SGreg Kroah-Hartman return -1; 2164ab4382d2SGreg Kroah-Hartman 2165ab4382d2SGreg Kroah-Hartman port = state->uart_port; 2166ab4382d2SGreg Kroah-Hartman if (!(port->ops->poll_get_char && port->ops->poll_put_char)) 2167ab4382d2SGreg Kroah-Hartman return -1; 2168ab4382d2SGreg Kroah-Hartman 2169ab4382d2SGreg Kroah-Hartman if (options) { 2170ab4382d2SGreg Kroah-Hartman uart_parse_options(options, &baud, &parity, &bits, &flow); 2171ab4382d2SGreg Kroah-Hartman return uart_set_options(port, NULL, baud, parity, bits, flow); 2172ab4382d2SGreg Kroah-Hartman } 2173ab4382d2SGreg Kroah-Hartman 2174ab4382d2SGreg Kroah-Hartman return 0; 2175ab4382d2SGreg Kroah-Hartman } 2176ab4382d2SGreg Kroah-Hartman 2177ab4382d2SGreg Kroah-Hartman static int uart_poll_get_char(struct tty_driver *driver, int line) 2178ab4382d2SGreg Kroah-Hartman { 2179ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2180ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2181ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2182ab4382d2SGreg Kroah-Hartman 2183ab4382d2SGreg Kroah-Hartman if (!state || !state->uart_port) 2184ab4382d2SGreg Kroah-Hartman return -1; 2185ab4382d2SGreg Kroah-Hartman 2186ab4382d2SGreg Kroah-Hartman port = state->uart_port; 2187ab4382d2SGreg Kroah-Hartman return port->ops->poll_get_char(port); 2188ab4382d2SGreg Kroah-Hartman } 2189ab4382d2SGreg Kroah-Hartman 2190ab4382d2SGreg Kroah-Hartman static void uart_poll_put_char(struct tty_driver *driver, int line, char ch) 2191ab4382d2SGreg Kroah-Hartman { 2192ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2193ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2194ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2195ab4382d2SGreg Kroah-Hartman 2196ab4382d2SGreg Kroah-Hartman if (!state || !state->uart_port) 2197ab4382d2SGreg Kroah-Hartman return; 2198ab4382d2SGreg Kroah-Hartman 2199ab4382d2SGreg Kroah-Hartman port = state->uart_port; 2200ab4382d2SGreg Kroah-Hartman port->ops->poll_put_char(port, ch); 2201ab4382d2SGreg Kroah-Hartman } 2202ab4382d2SGreg Kroah-Hartman #endif 2203ab4382d2SGreg Kroah-Hartman 2204ab4382d2SGreg Kroah-Hartman static const struct tty_operations uart_ops = { 2205ab4382d2SGreg Kroah-Hartman .open = uart_open, 2206ab4382d2SGreg Kroah-Hartman .close = uart_close, 2207ab4382d2SGreg Kroah-Hartman .write = uart_write, 2208ab4382d2SGreg Kroah-Hartman .put_char = uart_put_char, 2209ab4382d2SGreg Kroah-Hartman .flush_chars = uart_flush_chars, 2210ab4382d2SGreg Kroah-Hartman .write_room = uart_write_room, 2211ab4382d2SGreg Kroah-Hartman .chars_in_buffer= uart_chars_in_buffer, 2212ab4382d2SGreg Kroah-Hartman .flush_buffer = uart_flush_buffer, 2213ab4382d2SGreg Kroah-Hartman .ioctl = uart_ioctl, 2214ab4382d2SGreg Kroah-Hartman .throttle = uart_throttle, 2215ab4382d2SGreg Kroah-Hartman .unthrottle = uart_unthrottle, 2216ab4382d2SGreg Kroah-Hartman .send_xchar = uart_send_xchar, 2217ab4382d2SGreg Kroah-Hartman .set_termios = uart_set_termios, 2218ab4382d2SGreg Kroah-Hartman .set_ldisc = uart_set_ldisc, 2219ab4382d2SGreg Kroah-Hartman .stop = uart_stop, 2220ab4382d2SGreg Kroah-Hartman .start = uart_start, 2221ab4382d2SGreg Kroah-Hartman .hangup = uart_hangup, 2222ab4382d2SGreg Kroah-Hartman .break_ctl = uart_break_ctl, 2223ab4382d2SGreg Kroah-Hartman .wait_until_sent= uart_wait_until_sent, 2224ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_PROC_FS 2225ab4382d2SGreg Kroah-Hartman .proc_fops = &uart_proc_fops, 2226ab4382d2SGreg Kroah-Hartman #endif 2227ab4382d2SGreg Kroah-Hartman .tiocmget = uart_tiocmget, 2228ab4382d2SGreg Kroah-Hartman .tiocmset = uart_tiocmset, 2229ab4382d2SGreg Kroah-Hartman .get_icount = uart_get_icount, 2230ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 2231ab4382d2SGreg Kroah-Hartman .poll_init = uart_poll_init, 2232ab4382d2SGreg Kroah-Hartman .poll_get_char = uart_poll_get_char, 2233ab4382d2SGreg Kroah-Hartman .poll_put_char = uart_poll_put_char, 2234ab4382d2SGreg Kroah-Hartman #endif 2235ab4382d2SGreg Kroah-Hartman }; 2236ab4382d2SGreg Kroah-Hartman 2237ab4382d2SGreg Kroah-Hartman static const struct tty_port_operations uart_port_ops = { 2238ab4382d2SGreg Kroah-Hartman .carrier_raised = uart_carrier_raised, 2239ab4382d2SGreg Kroah-Hartman .dtr_rts = uart_dtr_rts, 2240ab4382d2SGreg Kroah-Hartman }; 2241ab4382d2SGreg Kroah-Hartman 2242ab4382d2SGreg Kroah-Hartman /** 2243ab4382d2SGreg Kroah-Hartman * uart_register_driver - register a driver with the uart core layer 2244ab4382d2SGreg Kroah-Hartman * @drv: low level driver structure 2245ab4382d2SGreg Kroah-Hartman * 2246ab4382d2SGreg Kroah-Hartman * Register a uart driver with the core driver. We in turn register 2247ab4382d2SGreg Kroah-Hartman * with the tty layer, and initialise the core driver per-port state. 2248ab4382d2SGreg Kroah-Hartman * 2249ab4382d2SGreg Kroah-Hartman * We have a proc file in /proc/tty/driver which is named after the 2250ab4382d2SGreg Kroah-Hartman * normal driver. 2251ab4382d2SGreg Kroah-Hartman * 2252ab4382d2SGreg Kroah-Hartman * drv->port should be NULL, and the per-port structures should be 2253ab4382d2SGreg Kroah-Hartman * registered using uart_add_one_port after this call has succeeded. 2254ab4382d2SGreg Kroah-Hartman */ 2255ab4382d2SGreg Kroah-Hartman int uart_register_driver(struct uart_driver *drv) 2256ab4382d2SGreg Kroah-Hartman { 2257ab4382d2SGreg Kroah-Hartman struct tty_driver *normal; 2258ab4382d2SGreg Kroah-Hartman int i, retval; 2259ab4382d2SGreg Kroah-Hartman 2260ab4382d2SGreg Kroah-Hartman BUG_ON(drv->state); 2261ab4382d2SGreg Kroah-Hartman 2262ab4382d2SGreg Kroah-Hartman /* 2263ab4382d2SGreg Kroah-Hartman * Maybe we should be using a slab cache for this, especially if 2264ab4382d2SGreg Kroah-Hartman * we have a large number of ports to handle. 2265ab4382d2SGreg Kroah-Hartman */ 2266ab4382d2SGreg Kroah-Hartman drv->state = kzalloc(sizeof(struct uart_state) * drv->nr, GFP_KERNEL); 2267ab4382d2SGreg Kroah-Hartman if (!drv->state) 2268ab4382d2SGreg Kroah-Hartman goto out; 2269ab4382d2SGreg Kroah-Hartman 2270ab4382d2SGreg Kroah-Hartman normal = alloc_tty_driver(drv->nr); 2271ab4382d2SGreg Kroah-Hartman if (!normal) 2272ab4382d2SGreg Kroah-Hartman goto out_kfree; 2273ab4382d2SGreg Kroah-Hartman 2274ab4382d2SGreg Kroah-Hartman drv->tty_driver = normal; 2275ab4382d2SGreg Kroah-Hartman 2276ab4382d2SGreg Kroah-Hartman normal->owner = drv->owner; 2277ab4382d2SGreg Kroah-Hartman normal->driver_name = drv->driver_name; 2278ab4382d2SGreg Kroah-Hartman normal->name = drv->dev_name; 2279ab4382d2SGreg Kroah-Hartman normal->major = drv->major; 2280ab4382d2SGreg Kroah-Hartman normal->minor_start = drv->minor; 2281ab4382d2SGreg Kroah-Hartman normal->type = TTY_DRIVER_TYPE_SERIAL; 2282ab4382d2SGreg Kroah-Hartman normal->subtype = SERIAL_TYPE_NORMAL; 2283ab4382d2SGreg Kroah-Hartman normal->init_termios = tty_std_termios; 2284ab4382d2SGreg Kroah-Hartman normal->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; 2285ab4382d2SGreg Kroah-Hartman normal->init_termios.c_ispeed = normal->init_termios.c_ospeed = 9600; 2286ab4382d2SGreg Kroah-Hartman normal->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; 2287ab4382d2SGreg Kroah-Hartman normal->driver_state = drv; 2288ab4382d2SGreg Kroah-Hartman tty_set_operations(normal, &uart_ops); 2289ab4382d2SGreg Kroah-Hartman 2290ab4382d2SGreg Kroah-Hartman /* 2291ab4382d2SGreg Kroah-Hartman * Initialise the UART state(s). 2292ab4382d2SGreg Kroah-Hartman */ 2293ab4382d2SGreg Kroah-Hartman for (i = 0; i < drv->nr; i++) { 2294ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + i; 2295ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2296ab4382d2SGreg Kroah-Hartman 2297ab4382d2SGreg Kroah-Hartman tty_port_init(port); 2298ab4382d2SGreg Kroah-Hartman port->ops = &uart_port_ops; 2299ab4382d2SGreg Kroah-Hartman port->close_delay = 500; /* .5 seconds */ 2300ab4382d2SGreg Kroah-Hartman port->closing_wait = 30000; /* 30 seconds */ 2301ab4382d2SGreg Kroah-Hartman tasklet_init(&state->tlet, uart_tasklet_action, 2302ab4382d2SGreg Kroah-Hartman (unsigned long)state); 2303ab4382d2SGreg Kroah-Hartman } 2304ab4382d2SGreg Kroah-Hartman 2305ab4382d2SGreg Kroah-Hartman retval = tty_register_driver(normal); 2306ab4382d2SGreg Kroah-Hartman if (retval >= 0) 2307ab4382d2SGreg Kroah-Hartman return retval; 2308ab4382d2SGreg Kroah-Hartman 2309ab4382d2SGreg Kroah-Hartman put_tty_driver(normal); 2310ab4382d2SGreg Kroah-Hartman out_kfree: 2311ab4382d2SGreg Kroah-Hartman kfree(drv->state); 2312ab4382d2SGreg Kroah-Hartman out: 2313ab4382d2SGreg Kroah-Hartman return -ENOMEM; 2314ab4382d2SGreg Kroah-Hartman } 2315ab4382d2SGreg Kroah-Hartman 2316ab4382d2SGreg Kroah-Hartman /** 2317ab4382d2SGreg Kroah-Hartman * uart_unregister_driver - remove a driver from the uart core layer 2318ab4382d2SGreg Kroah-Hartman * @drv: low level driver structure 2319ab4382d2SGreg Kroah-Hartman * 2320ab4382d2SGreg Kroah-Hartman * Remove all references to a driver from the core driver. The low 2321ab4382d2SGreg Kroah-Hartman * level driver must have removed all its ports via the 2322ab4382d2SGreg Kroah-Hartman * uart_remove_one_port() if it registered them with uart_add_one_port(). 2323ab4382d2SGreg Kroah-Hartman * (ie, drv->port == NULL) 2324ab4382d2SGreg Kroah-Hartman */ 2325ab4382d2SGreg Kroah-Hartman void uart_unregister_driver(struct uart_driver *drv) 2326ab4382d2SGreg Kroah-Hartman { 2327ab4382d2SGreg Kroah-Hartman struct tty_driver *p = drv->tty_driver; 2328ab4382d2SGreg Kroah-Hartman tty_unregister_driver(p); 2329ab4382d2SGreg Kroah-Hartman put_tty_driver(p); 2330ab4382d2SGreg Kroah-Hartman kfree(drv->state); 2331ab4382d2SGreg Kroah-Hartman drv->tty_driver = NULL; 2332ab4382d2SGreg Kroah-Hartman } 2333ab4382d2SGreg Kroah-Hartman 2334ab4382d2SGreg Kroah-Hartman struct tty_driver *uart_console_device(struct console *co, int *index) 2335ab4382d2SGreg Kroah-Hartman { 2336ab4382d2SGreg Kroah-Hartman struct uart_driver *p = co->data; 2337ab4382d2SGreg Kroah-Hartman *index = co->index; 2338ab4382d2SGreg Kroah-Hartman return p->tty_driver; 2339ab4382d2SGreg Kroah-Hartman } 2340ab4382d2SGreg Kroah-Hartman 2341ab4382d2SGreg Kroah-Hartman /** 2342ab4382d2SGreg Kroah-Hartman * uart_add_one_port - attach a driver-defined port structure 2343ab4382d2SGreg Kroah-Hartman * @drv: pointer to the uart low level driver structure for this port 2344ab4382d2SGreg Kroah-Hartman * @uport: uart port structure to use for this port. 2345ab4382d2SGreg Kroah-Hartman * 2346ab4382d2SGreg Kroah-Hartman * This allows the driver to register its own uart_port structure 2347ab4382d2SGreg Kroah-Hartman * with the core driver. The main purpose is to allow the low 2348ab4382d2SGreg Kroah-Hartman * level uart drivers to expand uart_port, rather than having yet 2349ab4382d2SGreg Kroah-Hartman * more levels of structures. 2350ab4382d2SGreg Kroah-Hartman */ 2351ab4382d2SGreg Kroah-Hartman int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport) 2352ab4382d2SGreg Kroah-Hartman { 2353ab4382d2SGreg Kroah-Hartman struct uart_state *state; 2354ab4382d2SGreg Kroah-Hartman struct tty_port *port; 2355ab4382d2SGreg Kroah-Hartman int ret = 0; 2356ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 2357ab4382d2SGreg Kroah-Hartman 2358ab4382d2SGreg Kroah-Hartman BUG_ON(in_interrupt()); 2359ab4382d2SGreg Kroah-Hartman 2360ab4382d2SGreg Kroah-Hartman if (uport->line >= drv->nr) 2361ab4382d2SGreg Kroah-Hartman return -EINVAL; 2362ab4382d2SGreg Kroah-Hartman 2363ab4382d2SGreg Kroah-Hartman state = drv->state + uport->line; 2364ab4382d2SGreg Kroah-Hartman port = &state->port; 2365ab4382d2SGreg Kroah-Hartman 2366ab4382d2SGreg Kroah-Hartman mutex_lock(&port_mutex); 2367ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2368ab4382d2SGreg Kroah-Hartman if (state->uart_port) { 2369ab4382d2SGreg Kroah-Hartman ret = -EINVAL; 2370ab4382d2SGreg Kroah-Hartman goto out; 2371ab4382d2SGreg Kroah-Hartman } 2372ab4382d2SGreg Kroah-Hartman 2373ab4382d2SGreg Kroah-Hartman state->uart_port = uport; 2374ab4382d2SGreg Kroah-Hartman state->pm_state = -1; 2375ab4382d2SGreg Kroah-Hartman 2376ab4382d2SGreg Kroah-Hartman uport->cons = drv->cons; 2377ab4382d2SGreg Kroah-Hartman uport->state = state; 2378ab4382d2SGreg Kroah-Hartman 2379ab4382d2SGreg Kroah-Hartman /* 2380ab4382d2SGreg Kroah-Hartman * If this port is a console, then the spinlock is already 2381ab4382d2SGreg Kroah-Hartman * initialised. 2382ab4382d2SGreg Kroah-Hartman */ 2383ab4382d2SGreg Kroah-Hartman if (!(uart_console(uport) && (uport->cons->flags & CON_ENABLED))) { 2384ab4382d2SGreg Kroah-Hartman spin_lock_init(&uport->lock); 2385ab4382d2SGreg Kroah-Hartman lockdep_set_class(&uport->lock, &port_lock_key); 2386ab4382d2SGreg Kroah-Hartman } 2387ab4382d2SGreg Kroah-Hartman 2388ab4382d2SGreg Kroah-Hartman uart_configure_port(drv, state, uport); 2389ab4382d2SGreg Kroah-Hartman 2390ab4382d2SGreg Kroah-Hartman /* 2391ab4382d2SGreg Kroah-Hartman * Register the port whether it's detected or not. This allows 2392ab4382d2SGreg Kroah-Hartman * setserial to be used to alter this ports parameters. 2393ab4382d2SGreg Kroah-Hartman */ 2394ab4382d2SGreg Kroah-Hartman tty_dev = tty_register_device(drv->tty_driver, uport->line, uport->dev); 2395ab4382d2SGreg Kroah-Hartman if (likely(!IS_ERR(tty_dev))) { 2396ab4382d2SGreg Kroah-Hartman device_init_wakeup(tty_dev, 1); 2397ab4382d2SGreg Kroah-Hartman device_set_wakeup_enable(tty_dev, 0); 2398ab4382d2SGreg Kroah-Hartman } else 2399ab4382d2SGreg Kroah-Hartman printk(KERN_ERR "Cannot register tty device on line %d\n", 2400ab4382d2SGreg Kroah-Hartman uport->line); 2401ab4382d2SGreg Kroah-Hartman 2402ab4382d2SGreg Kroah-Hartman /* 2403ab4382d2SGreg Kroah-Hartman * Ensure UPF_DEAD is not set. 2404ab4382d2SGreg Kroah-Hartman */ 2405ab4382d2SGreg Kroah-Hartman uport->flags &= ~UPF_DEAD; 2406ab4382d2SGreg Kroah-Hartman 2407ab4382d2SGreg Kroah-Hartman out: 2408ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2409ab4382d2SGreg Kroah-Hartman mutex_unlock(&port_mutex); 2410ab4382d2SGreg Kroah-Hartman 2411ab4382d2SGreg Kroah-Hartman return ret; 2412ab4382d2SGreg Kroah-Hartman } 2413ab4382d2SGreg Kroah-Hartman 2414ab4382d2SGreg Kroah-Hartman /** 2415ab4382d2SGreg Kroah-Hartman * uart_remove_one_port - detach a driver defined port structure 2416ab4382d2SGreg Kroah-Hartman * @drv: pointer to the uart low level driver structure for this port 2417ab4382d2SGreg Kroah-Hartman * @uport: uart port structure for this port 2418ab4382d2SGreg Kroah-Hartman * 2419ab4382d2SGreg Kroah-Hartman * This unhooks (and hangs up) the specified port structure from the 2420ab4382d2SGreg Kroah-Hartman * core driver. No further calls will be made to the low-level code 2421ab4382d2SGreg Kroah-Hartman * for this port. 2422ab4382d2SGreg Kroah-Hartman */ 2423ab4382d2SGreg Kroah-Hartman int uart_remove_one_port(struct uart_driver *drv, struct uart_port *uport) 2424ab4382d2SGreg Kroah-Hartman { 2425ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 2426ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2427ab4382d2SGreg Kroah-Hartman 2428ab4382d2SGreg Kroah-Hartman BUG_ON(in_interrupt()); 2429ab4382d2SGreg Kroah-Hartman 2430ab4382d2SGreg Kroah-Hartman if (state->uart_port != uport) 2431ab4382d2SGreg Kroah-Hartman printk(KERN_ALERT "Removing wrong port: %p != %p\n", 2432ab4382d2SGreg Kroah-Hartman state->uart_port, uport); 2433ab4382d2SGreg Kroah-Hartman 2434ab4382d2SGreg Kroah-Hartman mutex_lock(&port_mutex); 2435ab4382d2SGreg Kroah-Hartman 2436ab4382d2SGreg Kroah-Hartman /* 2437ab4382d2SGreg Kroah-Hartman * Mark the port "dead" - this prevents any opens from 2438ab4382d2SGreg Kroah-Hartman * succeeding while we shut down the port. 2439ab4382d2SGreg Kroah-Hartman */ 2440ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2441ab4382d2SGreg Kroah-Hartman uport->flags |= UPF_DEAD; 2442ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2443ab4382d2SGreg Kroah-Hartman 2444ab4382d2SGreg Kroah-Hartman /* 2445ab4382d2SGreg Kroah-Hartman * Remove the devices from the tty layer 2446ab4382d2SGreg Kroah-Hartman */ 2447ab4382d2SGreg Kroah-Hartman tty_unregister_device(drv->tty_driver, uport->line); 2448ab4382d2SGreg Kroah-Hartman 2449ab4382d2SGreg Kroah-Hartman if (port->tty) 2450ab4382d2SGreg Kroah-Hartman tty_vhangup(port->tty); 2451ab4382d2SGreg Kroah-Hartman 2452ab4382d2SGreg Kroah-Hartman /* 2453ab4382d2SGreg Kroah-Hartman * Free the port IO and memory resources, if any. 2454ab4382d2SGreg Kroah-Hartman */ 2455ab4382d2SGreg Kroah-Hartman if (uport->type != PORT_UNKNOWN) 2456ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 2457ab4382d2SGreg Kroah-Hartman 2458ab4382d2SGreg Kroah-Hartman /* 2459ab4382d2SGreg Kroah-Hartman * Indicate that there isn't a port here anymore. 2460ab4382d2SGreg Kroah-Hartman */ 2461ab4382d2SGreg Kroah-Hartman uport->type = PORT_UNKNOWN; 2462ab4382d2SGreg Kroah-Hartman 2463ab4382d2SGreg Kroah-Hartman /* 2464ab4382d2SGreg Kroah-Hartman * Kill the tasklet, and free resources. 2465ab4382d2SGreg Kroah-Hartman */ 2466ab4382d2SGreg Kroah-Hartman tasklet_kill(&state->tlet); 2467ab4382d2SGreg Kroah-Hartman 2468ab4382d2SGreg Kroah-Hartman state->uart_port = NULL; 2469ab4382d2SGreg Kroah-Hartman mutex_unlock(&port_mutex); 2470ab4382d2SGreg Kroah-Hartman 2471ab4382d2SGreg Kroah-Hartman return 0; 2472ab4382d2SGreg Kroah-Hartman } 2473ab4382d2SGreg Kroah-Hartman 2474ab4382d2SGreg Kroah-Hartman /* 2475ab4382d2SGreg Kroah-Hartman * Are the two ports equivalent? 2476ab4382d2SGreg Kroah-Hartman */ 2477ab4382d2SGreg Kroah-Hartman int uart_match_port(struct uart_port *port1, struct uart_port *port2) 2478ab4382d2SGreg Kroah-Hartman { 2479ab4382d2SGreg Kroah-Hartman if (port1->iotype != port2->iotype) 2480ab4382d2SGreg Kroah-Hartman return 0; 2481ab4382d2SGreg Kroah-Hartman 2482ab4382d2SGreg Kroah-Hartman switch (port1->iotype) { 2483ab4382d2SGreg Kroah-Hartman case UPIO_PORT: 2484ab4382d2SGreg Kroah-Hartman return (port1->iobase == port2->iobase); 2485ab4382d2SGreg Kroah-Hartman case UPIO_HUB6: 2486ab4382d2SGreg Kroah-Hartman return (port1->iobase == port2->iobase) && 2487ab4382d2SGreg Kroah-Hartman (port1->hub6 == port2->hub6); 2488ab4382d2SGreg Kroah-Hartman case UPIO_MEM: 2489ab4382d2SGreg Kroah-Hartman case UPIO_MEM32: 2490ab4382d2SGreg Kroah-Hartman case UPIO_AU: 2491ab4382d2SGreg Kroah-Hartman case UPIO_TSI: 2492ab4382d2SGreg Kroah-Hartman case UPIO_DWAPB: 2493ab4382d2SGreg Kroah-Hartman case UPIO_DWAPB32: 2494ab4382d2SGreg Kroah-Hartman return (port1->mapbase == port2->mapbase); 2495ab4382d2SGreg Kroah-Hartman } 2496ab4382d2SGreg Kroah-Hartman return 0; 2497ab4382d2SGreg Kroah-Hartman } 2498ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_match_port); 2499ab4382d2SGreg Kroah-Hartman 2500ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_write_wakeup); 2501ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_register_driver); 2502ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_unregister_driver); 2503ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_suspend_port); 2504ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_resume_port); 2505ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_add_one_port); 2506ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_remove_one_port); 2507ab4382d2SGreg Kroah-Hartman 2508ab4382d2SGreg Kroah-Hartman MODULE_DESCRIPTION("Serial driver core"); 2509ab4382d2SGreg Kroah-Hartman MODULE_LICENSE("GPL"); 2510