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); 601f33a51dSJiri Slaby static void uart_wait_until_sent(struct tty_struct *tty, 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); 756a3e492bSJiri Slaby tty_wakeup(state->port.tty); 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 inline void 111ab4382d2SGreg Kroah-Hartman uart_update_mctrl(struct uart_port *port, unsigned int set, unsigned int clear) 112ab4382d2SGreg Kroah-Hartman { 113ab4382d2SGreg Kroah-Hartman unsigned long flags; 114ab4382d2SGreg Kroah-Hartman unsigned int old; 115ab4382d2SGreg Kroah-Hartman 116ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 117ab4382d2SGreg Kroah-Hartman old = port->mctrl; 118ab4382d2SGreg Kroah-Hartman port->mctrl = (old & ~clear) | set; 119ab4382d2SGreg Kroah-Hartman if (old != port->mctrl) 120ab4382d2SGreg Kroah-Hartman port->ops->set_mctrl(port, port->mctrl); 121ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 122ab4382d2SGreg Kroah-Hartman } 123ab4382d2SGreg Kroah-Hartman 124ab4382d2SGreg Kroah-Hartman #define uart_set_mctrl(port, set) uart_update_mctrl(port, set, 0) 125ab4382d2SGreg Kroah-Hartman #define uart_clear_mctrl(port, clear) uart_update_mctrl(port, 0, clear) 126ab4382d2SGreg Kroah-Hartman 127ab4382d2SGreg Kroah-Hartman /* 128ab4382d2SGreg Kroah-Hartman * Startup the port. This will be called once per open. All calls 129ab4382d2SGreg Kroah-Hartman * will be serialised by the per-port mutex. 130ab4382d2SGreg Kroah-Hartman */ 131ab4382d2SGreg Kroah-Hartman static int uart_startup(struct tty_struct *tty, struct uart_state *state, int init_hw) 132ab4382d2SGreg Kroah-Hartman { 133ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 134ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 135ab4382d2SGreg Kroah-Hartman unsigned long page; 136ab4382d2SGreg Kroah-Hartman int retval = 0; 137ab4382d2SGreg Kroah-Hartman 138ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_INITIALIZED) 139ab4382d2SGreg Kroah-Hartman return 0; 140ab4382d2SGreg Kroah-Hartman 141ab4382d2SGreg Kroah-Hartman /* 142ab4382d2SGreg Kroah-Hartman * Set the TTY IO error marker - we will only clear this 143ab4382d2SGreg Kroah-Hartman * once we have successfully opened the port. Also set 144ab4382d2SGreg Kroah-Hartman * up the tty->alt_speed kludge 145ab4382d2SGreg Kroah-Hartman */ 146ab4382d2SGreg Kroah-Hartman set_bit(TTY_IO_ERROR, &tty->flags); 147ab4382d2SGreg Kroah-Hartman 148ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) 149ab4382d2SGreg Kroah-Hartman return 0; 150ab4382d2SGreg Kroah-Hartman 151ab4382d2SGreg Kroah-Hartman /* 152ab4382d2SGreg Kroah-Hartman * Initialise and allocate the transmit and temporary 153ab4382d2SGreg Kroah-Hartman * buffer. 154ab4382d2SGreg Kroah-Hartman */ 155ab4382d2SGreg Kroah-Hartman if (!state->xmit.buf) { 156ab4382d2SGreg Kroah-Hartman /* This is protected by the per port mutex */ 157ab4382d2SGreg Kroah-Hartman page = get_zeroed_page(GFP_KERNEL); 158ab4382d2SGreg Kroah-Hartman if (!page) 159ab4382d2SGreg Kroah-Hartman return -ENOMEM; 160ab4382d2SGreg Kroah-Hartman 161ab4382d2SGreg Kroah-Hartman state->xmit.buf = (unsigned char *) page; 162ab4382d2SGreg Kroah-Hartman uart_circ_clear(&state->xmit); 163ab4382d2SGreg Kroah-Hartman } 164ab4382d2SGreg Kroah-Hartman 165ab4382d2SGreg Kroah-Hartman retval = uport->ops->startup(uport); 166ab4382d2SGreg Kroah-Hartman if (retval == 0) { 167c7d7abffSJiri Slaby if (uart_console(uport) && uport->cons->cflag) { 168c7d7abffSJiri Slaby tty->termios->c_cflag = uport->cons->cflag; 169c7d7abffSJiri Slaby uport->cons->cflag = 0; 170c7d7abffSJiri Slaby } 171ab4382d2SGreg Kroah-Hartman /* 172ab4382d2SGreg Kroah-Hartman * Initialise the hardware port settings. 173ab4382d2SGreg Kroah-Hartman */ 174ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 175ab4382d2SGreg Kroah-Hartman 176c7d7abffSJiri Slaby if (init_hw) { 177ab4382d2SGreg Kroah-Hartman /* 178ab4382d2SGreg Kroah-Hartman * Setup the RTS and DTR signals once the 179ab4382d2SGreg Kroah-Hartman * port is open and ready to respond. 180ab4382d2SGreg Kroah-Hartman */ 181ab4382d2SGreg Kroah-Hartman if (tty->termios->c_cflag & CBAUD) 182ab4382d2SGreg Kroah-Hartman uart_set_mctrl(uport, TIOCM_RTS | TIOCM_DTR); 183ab4382d2SGreg Kroah-Hartman } 184ab4382d2SGreg Kroah-Hartman 185ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_CTS_FLOW) { 186ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 187ab4382d2SGreg Kroah-Hartman if (!(uport->ops->get_mctrl(uport) & TIOCM_CTS)) 188ab4382d2SGreg Kroah-Hartman tty->hw_stopped = 1; 189ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 190ab4382d2SGreg Kroah-Hartman } 191ab4382d2SGreg Kroah-Hartman 192ab4382d2SGreg Kroah-Hartman set_bit(ASYNCB_INITIALIZED, &port->flags); 193ab4382d2SGreg Kroah-Hartman 194ab4382d2SGreg Kroah-Hartman clear_bit(TTY_IO_ERROR, &tty->flags); 195ab4382d2SGreg Kroah-Hartman } 196ab4382d2SGreg Kroah-Hartman 197ab4382d2SGreg Kroah-Hartman if (retval && capable(CAP_SYS_ADMIN)) 198ab4382d2SGreg Kroah-Hartman retval = 0; 199ab4382d2SGreg Kroah-Hartman 200ab4382d2SGreg Kroah-Hartman return retval; 201ab4382d2SGreg Kroah-Hartman } 202ab4382d2SGreg Kroah-Hartman 203ab4382d2SGreg Kroah-Hartman /* 204ab4382d2SGreg Kroah-Hartman * This routine will shutdown a serial port; interrupts are disabled, and 205ab4382d2SGreg Kroah-Hartman * DTR is dropped if the hangup on close termio flag is on. Calls to 206ab4382d2SGreg Kroah-Hartman * uart_shutdown are serialised by the per-port semaphore. 207ab4382d2SGreg Kroah-Hartman */ 208ab4382d2SGreg Kroah-Hartman static void uart_shutdown(struct tty_struct *tty, struct uart_state *state) 209ab4382d2SGreg Kroah-Hartman { 210ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 211ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 212ab4382d2SGreg Kroah-Hartman 213ab4382d2SGreg Kroah-Hartman /* 214ab4382d2SGreg Kroah-Hartman * Set the TTY IO error marker 215ab4382d2SGreg Kroah-Hartman */ 216ab4382d2SGreg Kroah-Hartman if (tty) 217ab4382d2SGreg Kroah-Hartman set_bit(TTY_IO_ERROR, &tty->flags); 218ab4382d2SGreg Kroah-Hartman 219ab4382d2SGreg Kroah-Hartman if (test_and_clear_bit(ASYNCB_INITIALIZED, &port->flags)) { 220ab4382d2SGreg Kroah-Hartman /* 221ab4382d2SGreg Kroah-Hartman * Turn off DTR and RTS early. 222ab4382d2SGreg Kroah-Hartman */ 223ab4382d2SGreg Kroah-Hartman if (!tty || (tty->termios->c_cflag & HUPCL)) 224ab4382d2SGreg Kroah-Hartman uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); 225ab4382d2SGreg Kroah-Hartman 226ab4382d2SGreg Kroah-Hartman /* 227ab4382d2SGreg Kroah-Hartman * clear delta_msr_wait queue to avoid mem leaks: we may free 228ab4382d2SGreg Kroah-Hartman * the irq here so the queue might never be woken up. Note 229ab4382d2SGreg Kroah-Hartman * that we won't end up waiting on delta_msr_wait again since 230ab4382d2SGreg Kroah-Hartman * any outstanding file descriptors should be pointing at 231ab4382d2SGreg Kroah-Hartman * hung_up_tty_fops now. 232ab4382d2SGreg Kroah-Hartman */ 233ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->delta_msr_wait); 234ab4382d2SGreg Kroah-Hartman 235ab4382d2SGreg Kroah-Hartman /* 236ab4382d2SGreg Kroah-Hartman * Free the IRQ and disable the port. 237ab4382d2SGreg Kroah-Hartman */ 238ab4382d2SGreg Kroah-Hartman uport->ops->shutdown(uport); 239ab4382d2SGreg Kroah-Hartman 240ab4382d2SGreg Kroah-Hartman /* 241ab4382d2SGreg Kroah-Hartman * Ensure that the IRQ handler isn't running on another CPU. 242ab4382d2SGreg Kroah-Hartman */ 243ab4382d2SGreg Kroah-Hartman synchronize_irq(uport->irq); 244ab4382d2SGreg Kroah-Hartman } 245ab4382d2SGreg Kroah-Hartman 246ab4382d2SGreg Kroah-Hartman /* 247ab4382d2SGreg Kroah-Hartman * Free the transmit buffer page. 248ab4382d2SGreg Kroah-Hartman */ 249ab4382d2SGreg Kroah-Hartman if (state->xmit.buf) { 250ab4382d2SGreg Kroah-Hartman free_page((unsigned long)state->xmit.buf); 251ab4382d2SGreg Kroah-Hartman state->xmit.buf = NULL; 252ab4382d2SGreg Kroah-Hartman } 253ab4382d2SGreg Kroah-Hartman } 254ab4382d2SGreg Kroah-Hartman 255ab4382d2SGreg Kroah-Hartman /** 256ab4382d2SGreg Kroah-Hartman * uart_update_timeout - update per-port FIFO timeout. 257ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port 258ab4382d2SGreg Kroah-Hartman * @cflag: termios cflag value 259ab4382d2SGreg Kroah-Hartman * @baud: speed of the port 260ab4382d2SGreg Kroah-Hartman * 261ab4382d2SGreg Kroah-Hartman * Set the port FIFO timeout value. The @cflag value should 262ab4382d2SGreg Kroah-Hartman * reflect the actual hardware settings. 263ab4382d2SGreg Kroah-Hartman */ 264ab4382d2SGreg Kroah-Hartman void 265ab4382d2SGreg Kroah-Hartman uart_update_timeout(struct uart_port *port, unsigned int cflag, 266ab4382d2SGreg Kroah-Hartman unsigned int baud) 267ab4382d2SGreg Kroah-Hartman { 268ab4382d2SGreg Kroah-Hartman unsigned int bits; 269ab4382d2SGreg Kroah-Hartman 270ab4382d2SGreg Kroah-Hartman /* byte size and parity */ 271ab4382d2SGreg Kroah-Hartman switch (cflag & CSIZE) { 272ab4382d2SGreg Kroah-Hartman case CS5: 273ab4382d2SGreg Kroah-Hartman bits = 7; 274ab4382d2SGreg Kroah-Hartman break; 275ab4382d2SGreg Kroah-Hartman case CS6: 276ab4382d2SGreg Kroah-Hartman bits = 8; 277ab4382d2SGreg Kroah-Hartman break; 278ab4382d2SGreg Kroah-Hartman case CS7: 279ab4382d2SGreg Kroah-Hartman bits = 9; 280ab4382d2SGreg Kroah-Hartman break; 281ab4382d2SGreg Kroah-Hartman default: 282ab4382d2SGreg Kroah-Hartman bits = 10; 283ab4382d2SGreg Kroah-Hartman break; /* CS8 */ 284ab4382d2SGreg Kroah-Hartman } 285ab4382d2SGreg Kroah-Hartman 286ab4382d2SGreg Kroah-Hartman if (cflag & CSTOPB) 287ab4382d2SGreg Kroah-Hartman bits++; 288ab4382d2SGreg Kroah-Hartman if (cflag & PARENB) 289ab4382d2SGreg Kroah-Hartman bits++; 290ab4382d2SGreg Kroah-Hartman 291ab4382d2SGreg Kroah-Hartman /* 292ab4382d2SGreg Kroah-Hartman * The total number of bits to be transmitted in the fifo. 293ab4382d2SGreg Kroah-Hartman */ 294ab4382d2SGreg Kroah-Hartman bits = bits * port->fifosize; 295ab4382d2SGreg Kroah-Hartman 296ab4382d2SGreg Kroah-Hartman /* 297ab4382d2SGreg Kroah-Hartman * Figure the timeout to send the above number of bits. 298ab4382d2SGreg Kroah-Hartman * Add .02 seconds of slop 299ab4382d2SGreg Kroah-Hartman */ 300ab4382d2SGreg Kroah-Hartman port->timeout = (HZ * bits) / baud + HZ/50; 301ab4382d2SGreg Kroah-Hartman } 302ab4382d2SGreg Kroah-Hartman 303ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_update_timeout); 304ab4382d2SGreg Kroah-Hartman 305ab4382d2SGreg Kroah-Hartman /** 306ab4382d2SGreg Kroah-Hartman * uart_get_baud_rate - return baud rate for a particular port 307ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port in question. 308ab4382d2SGreg Kroah-Hartman * @termios: desired termios settings. 309ab4382d2SGreg Kroah-Hartman * @old: old termios (or NULL) 310ab4382d2SGreg Kroah-Hartman * @min: minimum acceptable baud rate 311ab4382d2SGreg Kroah-Hartman * @max: maximum acceptable baud rate 312ab4382d2SGreg Kroah-Hartman * 313ab4382d2SGreg Kroah-Hartman * Decode the termios structure into a numeric baud rate, 314ab4382d2SGreg Kroah-Hartman * taking account of the magic 38400 baud rate (with spd_* 315ab4382d2SGreg Kroah-Hartman * flags), and mapping the %B0 rate to 9600 baud. 316ab4382d2SGreg Kroah-Hartman * 317ab4382d2SGreg Kroah-Hartman * If the new baud rate is invalid, try the old termios setting. 318ab4382d2SGreg Kroah-Hartman * If it's still invalid, we try 9600 baud. 319ab4382d2SGreg Kroah-Hartman * 320ab4382d2SGreg Kroah-Hartman * Update the @termios structure to reflect the baud rate 321ab4382d2SGreg Kroah-Hartman * we're actually going to be using. Don't do this for the case 322ab4382d2SGreg Kroah-Hartman * where B0 is requested ("hang up"). 323ab4382d2SGreg Kroah-Hartman */ 324ab4382d2SGreg Kroah-Hartman unsigned int 325ab4382d2SGreg Kroah-Hartman uart_get_baud_rate(struct uart_port *port, struct ktermios *termios, 326ab4382d2SGreg Kroah-Hartman struct ktermios *old, unsigned int min, unsigned int max) 327ab4382d2SGreg Kroah-Hartman { 328ab4382d2SGreg Kroah-Hartman unsigned int try, baud, altbaud = 38400; 329ab4382d2SGreg Kroah-Hartman int hung_up = 0; 330ab4382d2SGreg Kroah-Hartman upf_t flags = port->flags & UPF_SPD_MASK; 331ab4382d2SGreg Kroah-Hartman 332ab4382d2SGreg Kroah-Hartman if (flags == UPF_SPD_HI) 333ab4382d2SGreg Kroah-Hartman altbaud = 57600; 334ab4382d2SGreg Kroah-Hartman else if (flags == UPF_SPD_VHI) 335ab4382d2SGreg Kroah-Hartman altbaud = 115200; 336ab4382d2SGreg Kroah-Hartman else if (flags == UPF_SPD_SHI) 337ab4382d2SGreg Kroah-Hartman altbaud = 230400; 338ab4382d2SGreg Kroah-Hartman else if (flags == UPF_SPD_WARP) 339ab4382d2SGreg Kroah-Hartman altbaud = 460800; 340ab4382d2SGreg Kroah-Hartman 341ab4382d2SGreg Kroah-Hartman for (try = 0; try < 2; try++) { 342ab4382d2SGreg Kroah-Hartman baud = tty_termios_baud_rate(termios); 343ab4382d2SGreg Kroah-Hartman 344ab4382d2SGreg Kroah-Hartman /* 345ab4382d2SGreg Kroah-Hartman * The spd_hi, spd_vhi, spd_shi, spd_warp kludge... 346ab4382d2SGreg Kroah-Hartman * Die! Die! Die! 347ab4382d2SGreg Kroah-Hartman */ 348ab4382d2SGreg Kroah-Hartman if (baud == 38400) 349ab4382d2SGreg Kroah-Hartman baud = altbaud; 350ab4382d2SGreg Kroah-Hartman 351ab4382d2SGreg Kroah-Hartman /* 352ab4382d2SGreg Kroah-Hartman * Special case: B0 rate. 353ab4382d2SGreg Kroah-Hartman */ 354ab4382d2SGreg Kroah-Hartman if (baud == 0) { 355ab4382d2SGreg Kroah-Hartman hung_up = 1; 356ab4382d2SGreg Kroah-Hartman baud = 9600; 357ab4382d2SGreg Kroah-Hartman } 358ab4382d2SGreg Kroah-Hartman 359ab4382d2SGreg Kroah-Hartman if (baud >= min && baud <= max) 360ab4382d2SGreg Kroah-Hartman return baud; 361ab4382d2SGreg Kroah-Hartman 362ab4382d2SGreg Kroah-Hartman /* 363ab4382d2SGreg Kroah-Hartman * Oops, the quotient was zero. Try again with 364ab4382d2SGreg Kroah-Hartman * the old baud rate if possible. 365ab4382d2SGreg Kroah-Hartman */ 366ab4382d2SGreg Kroah-Hartman termios->c_cflag &= ~CBAUD; 367ab4382d2SGreg Kroah-Hartman if (old) { 368ab4382d2SGreg Kroah-Hartman baud = tty_termios_baud_rate(old); 369ab4382d2SGreg Kroah-Hartman if (!hung_up) 370ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 371ab4382d2SGreg Kroah-Hartman baud, baud); 372ab4382d2SGreg Kroah-Hartman old = NULL; 373ab4382d2SGreg Kroah-Hartman continue; 374ab4382d2SGreg Kroah-Hartman } 375ab4382d2SGreg Kroah-Hartman 376ab4382d2SGreg Kroah-Hartman /* 377ab4382d2SGreg Kroah-Hartman * As a last resort, if the range cannot be met then clip to 378ab4382d2SGreg Kroah-Hartman * the nearest chip supported rate. 379ab4382d2SGreg Kroah-Hartman */ 380ab4382d2SGreg Kroah-Hartman if (!hung_up) { 381ab4382d2SGreg Kroah-Hartman if (baud <= min) 382ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 383ab4382d2SGreg Kroah-Hartman min + 1, min + 1); 384ab4382d2SGreg Kroah-Hartman else 385ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 386ab4382d2SGreg Kroah-Hartman max - 1, max - 1); 387ab4382d2SGreg Kroah-Hartman } 388ab4382d2SGreg Kroah-Hartman } 389ab4382d2SGreg Kroah-Hartman /* Should never happen */ 390ab4382d2SGreg Kroah-Hartman WARN_ON(1); 391ab4382d2SGreg Kroah-Hartman return 0; 392ab4382d2SGreg Kroah-Hartman } 393ab4382d2SGreg Kroah-Hartman 394ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_get_baud_rate); 395ab4382d2SGreg Kroah-Hartman 396ab4382d2SGreg Kroah-Hartman /** 397ab4382d2SGreg Kroah-Hartman * uart_get_divisor - return uart clock divisor 398ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port. 399ab4382d2SGreg Kroah-Hartman * @baud: desired baud rate 400ab4382d2SGreg Kroah-Hartman * 401ab4382d2SGreg Kroah-Hartman * Calculate the uart clock divisor for the port. 402ab4382d2SGreg Kroah-Hartman */ 403ab4382d2SGreg Kroah-Hartman unsigned int 404ab4382d2SGreg Kroah-Hartman uart_get_divisor(struct uart_port *port, unsigned int baud) 405ab4382d2SGreg Kroah-Hartman { 406ab4382d2SGreg Kroah-Hartman unsigned int quot; 407ab4382d2SGreg Kroah-Hartman 408ab4382d2SGreg Kroah-Hartman /* 409ab4382d2SGreg Kroah-Hartman * Old custom speed handling. 410ab4382d2SGreg Kroah-Hartman */ 411ab4382d2SGreg Kroah-Hartman if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) 412ab4382d2SGreg Kroah-Hartman quot = port->custom_divisor; 413ab4382d2SGreg Kroah-Hartman else 414ab4382d2SGreg Kroah-Hartman quot = (port->uartclk + (8 * baud)) / (16 * baud); 415ab4382d2SGreg Kroah-Hartman 416ab4382d2SGreg Kroah-Hartman return quot; 417ab4382d2SGreg Kroah-Hartman } 418ab4382d2SGreg Kroah-Hartman 419ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_get_divisor); 420ab4382d2SGreg Kroah-Hartman 421ab4382d2SGreg Kroah-Hartman /* FIXME: Consistent locking policy */ 422ab4382d2SGreg Kroah-Hartman static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, 423ab4382d2SGreg Kroah-Hartman struct ktermios *old_termios) 424ab4382d2SGreg Kroah-Hartman { 425ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 426ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 427ab4382d2SGreg Kroah-Hartman struct ktermios *termios; 428ab4382d2SGreg Kroah-Hartman 429ab4382d2SGreg Kroah-Hartman /* 430ab4382d2SGreg Kroah-Hartman * If we have no tty, termios, or the port does not exist, 431ab4382d2SGreg Kroah-Hartman * then we can't set the parameters for this port. 432ab4382d2SGreg Kroah-Hartman */ 433ab4382d2SGreg Kroah-Hartman if (!tty || !tty->termios || uport->type == PORT_UNKNOWN) 434ab4382d2SGreg Kroah-Hartman return; 435ab4382d2SGreg Kroah-Hartman 436ab4382d2SGreg Kroah-Hartman termios = tty->termios; 437ab4382d2SGreg Kroah-Hartman 438ab4382d2SGreg Kroah-Hartman /* 439ab4382d2SGreg Kroah-Hartman * Set flags based on termios cflag 440ab4382d2SGreg Kroah-Hartman */ 441ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CRTSCTS) 442ab4382d2SGreg Kroah-Hartman set_bit(ASYNCB_CTS_FLOW, &port->flags); 443ab4382d2SGreg Kroah-Hartman else 444ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_CTS_FLOW, &port->flags); 445ab4382d2SGreg Kroah-Hartman 446ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CLOCAL) 447ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_CHECK_CD, &port->flags); 448ab4382d2SGreg Kroah-Hartman else 449ab4382d2SGreg Kroah-Hartman set_bit(ASYNCB_CHECK_CD, &port->flags); 450ab4382d2SGreg Kroah-Hartman 451ab4382d2SGreg Kroah-Hartman uport->ops->set_termios(uport, termios, old_termios); 452ab4382d2SGreg Kroah-Hartman } 453ab4382d2SGreg Kroah-Hartman 454ab4382d2SGreg Kroah-Hartman static inline int __uart_put_char(struct uart_port *port, 455ab4382d2SGreg Kroah-Hartman struct circ_buf *circ, unsigned char c) 456ab4382d2SGreg Kroah-Hartman { 457ab4382d2SGreg Kroah-Hartman unsigned long flags; 458ab4382d2SGreg Kroah-Hartman int ret = 0; 459ab4382d2SGreg Kroah-Hartman 460ab4382d2SGreg Kroah-Hartman if (!circ->buf) 461ab4382d2SGreg Kroah-Hartman return 0; 462ab4382d2SGreg Kroah-Hartman 463ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 464ab4382d2SGreg Kroah-Hartman if (uart_circ_chars_free(circ) != 0) { 465ab4382d2SGreg Kroah-Hartman circ->buf[circ->head] = c; 466ab4382d2SGreg Kroah-Hartman circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1); 467ab4382d2SGreg Kroah-Hartman ret = 1; 468ab4382d2SGreg Kroah-Hartman } 469ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 470ab4382d2SGreg Kroah-Hartman return ret; 471ab4382d2SGreg Kroah-Hartman } 472ab4382d2SGreg Kroah-Hartman 473ab4382d2SGreg Kroah-Hartman static int uart_put_char(struct tty_struct *tty, unsigned char ch) 474ab4382d2SGreg Kroah-Hartman { 475ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 476ab4382d2SGreg Kroah-Hartman 477ab4382d2SGreg Kroah-Hartman return __uart_put_char(state->uart_port, &state->xmit, ch); 478ab4382d2SGreg Kroah-Hartman } 479ab4382d2SGreg Kroah-Hartman 480ab4382d2SGreg Kroah-Hartman static void uart_flush_chars(struct tty_struct *tty) 481ab4382d2SGreg Kroah-Hartman { 482ab4382d2SGreg Kroah-Hartman uart_start(tty); 483ab4382d2SGreg Kroah-Hartman } 484ab4382d2SGreg Kroah-Hartman 485ab4382d2SGreg Kroah-Hartman static int uart_write(struct tty_struct *tty, 486ab4382d2SGreg Kroah-Hartman const unsigned char *buf, int count) 487ab4382d2SGreg Kroah-Hartman { 488ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 489ab4382d2SGreg Kroah-Hartman struct uart_port *port; 490ab4382d2SGreg Kroah-Hartman struct circ_buf *circ; 491ab4382d2SGreg Kroah-Hartman unsigned long flags; 492ab4382d2SGreg Kroah-Hartman int c, ret = 0; 493ab4382d2SGreg Kroah-Hartman 494ab4382d2SGreg Kroah-Hartman /* 495ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 496ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 497ab4382d2SGreg Kroah-Hartman */ 498ab4382d2SGreg Kroah-Hartman if (!state) { 499ab4382d2SGreg Kroah-Hartman WARN_ON(1); 500ab4382d2SGreg Kroah-Hartman return -EL3HLT; 501ab4382d2SGreg Kroah-Hartman } 502ab4382d2SGreg Kroah-Hartman 503ab4382d2SGreg Kroah-Hartman port = state->uart_port; 504ab4382d2SGreg Kroah-Hartman circ = &state->xmit; 505ab4382d2SGreg Kroah-Hartman 506ab4382d2SGreg Kroah-Hartman if (!circ->buf) 507ab4382d2SGreg Kroah-Hartman return 0; 508ab4382d2SGreg Kroah-Hartman 509ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 510ab4382d2SGreg Kroah-Hartman while (1) { 511ab4382d2SGreg Kroah-Hartman c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE); 512ab4382d2SGreg Kroah-Hartman if (count < c) 513ab4382d2SGreg Kroah-Hartman c = count; 514ab4382d2SGreg Kroah-Hartman if (c <= 0) 515ab4382d2SGreg Kroah-Hartman break; 516ab4382d2SGreg Kroah-Hartman memcpy(circ->buf + circ->head, buf, c); 517ab4382d2SGreg Kroah-Hartman circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1); 518ab4382d2SGreg Kroah-Hartman buf += c; 519ab4382d2SGreg Kroah-Hartman count -= c; 520ab4382d2SGreg Kroah-Hartman ret += c; 521ab4382d2SGreg Kroah-Hartman } 522ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 523ab4382d2SGreg Kroah-Hartman 524ab4382d2SGreg Kroah-Hartman uart_start(tty); 525ab4382d2SGreg Kroah-Hartman return ret; 526ab4382d2SGreg Kroah-Hartman } 527ab4382d2SGreg Kroah-Hartman 528ab4382d2SGreg Kroah-Hartman static int uart_write_room(struct tty_struct *tty) 529ab4382d2SGreg Kroah-Hartman { 530ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 531ab4382d2SGreg Kroah-Hartman unsigned long flags; 532ab4382d2SGreg Kroah-Hartman int ret; 533ab4382d2SGreg Kroah-Hartman 534ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&state->uart_port->lock, flags); 535ab4382d2SGreg Kroah-Hartman ret = uart_circ_chars_free(&state->xmit); 536ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&state->uart_port->lock, flags); 537ab4382d2SGreg Kroah-Hartman return ret; 538ab4382d2SGreg Kroah-Hartman } 539ab4382d2SGreg Kroah-Hartman 540ab4382d2SGreg Kroah-Hartman static int uart_chars_in_buffer(struct tty_struct *tty) 541ab4382d2SGreg Kroah-Hartman { 542ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 543ab4382d2SGreg Kroah-Hartman unsigned long flags; 544ab4382d2SGreg Kroah-Hartman int ret; 545ab4382d2SGreg Kroah-Hartman 546ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&state->uart_port->lock, flags); 547ab4382d2SGreg Kroah-Hartman ret = uart_circ_chars_pending(&state->xmit); 548ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&state->uart_port->lock, flags); 549ab4382d2SGreg Kroah-Hartman return ret; 550ab4382d2SGreg Kroah-Hartman } 551ab4382d2SGreg Kroah-Hartman 552ab4382d2SGreg Kroah-Hartman static void uart_flush_buffer(struct tty_struct *tty) 553ab4382d2SGreg Kroah-Hartman { 554ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 555ab4382d2SGreg Kroah-Hartman struct uart_port *port; 556ab4382d2SGreg Kroah-Hartman unsigned long flags; 557ab4382d2SGreg Kroah-Hartman 558ab4382d2SGreg Kroah-Hartman /* 559ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 560ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 561ab4382d2SGreg Kroah-Hartman */ 562ab4382d2SGreg Kroah-Hartman if (!state) { 563ab4382d2SGreg Kroah-Hartman WARN_ON(1); 564ab4382d2SGreg Kroah-Hartman return; 565ab4382d2SGreg Kroah-Hartman } 566ab4382d2SGreg Kroah-Hartman 567ab4382d2SGreg Kroah-Hartman port = state->uart_port; 568ab4382d2SGreg Kroah-Hartman pr_debug("uart_flush_buffer(%d) called\n", tty->index); 569ab4382d2SGreg Kroah-Hartman 570ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 571ab4382d2SGreg Kroah-Hartman uart_circ_clear(&state->xmit); 572ab4382d2SGreg Kroah-Hartman if (port->ops->flush_buffer) 573ab4382d2SGreg Kroah-Hartman port->ops->flush_buffer(port); 574ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 575ab4382d2SGreg Kroah-Hartman tty_wakeup(tty); 576ab4382d2SGreg Kroah-Hartman } 577ab4382d2SGreg Kroah-Hartman 578ab4382d2SGreg Kroah-Hartman /* 579ab4382d2SGreg Kroah-Hartman * This function is used to send a high-priority XON/XOFF character to 580ab4382d2SGreg Kroah-Hartman * the device 581ab4382d2SGreg Kroah-Hartman */ 582ab4382d2SGreg Kroah-Hartman static void uart_send_xchar(struct tty_struct *tty, char ch) 583ab4382d2SGreg Kroah-Hartman { 584ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 585ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 586ab4382d2SGreg Kroah-Hartman unsigned long flags; 587ab4382d2SGreg Kroah-Hartman 588ab4382d2SGreg Kroah-Hartman if (port->ops->send_xchar) 589ab4382d2SGreg Kroah-Hartman port->ops->send_xchar(port, ch); 590ab4382d2SGreg Kroah-Hartman else { 591ab4382d2SGreg Kroah-Hartman port->x_char = ch; 592ab4382d2SGreg Kroah-Hartman if (ch) { 593ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 594ab4382d2SGreg Kroah-Hartman port->ops->start_tx(port); 595ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 596ab4382d2SGreg Kroah-Hartman } 597ab4382d2SGreg Kroah-Hartman } 598ab4382d2SGreg Kroah-Hartman } 599ab4382d2SGreg Kroah-Hartman 600ab4382d2SGreg Kroah-Hartman static void uart_throttle(struct tty_struct *tty) 601ab4382d2SGreg Kroah-Hartman { 602ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 603ab4382d2SGreg Kroah-Hartman 604ab4382d2SGreg Kroah-Hartman if (I_IXOFF(tty)) 605ab4382d2SGreg Kroah-Hartman uart_send_xchar(tty, STOP_CHAR(tty)); 606ab4382d2SGreg Kroah-Hartman 607ab4382d2SGreg Kroah-Hartman if (tty->termios->c_cflag & CRTSCTS) 608ab4382d2SGreg Kroah-Hartman uart_clear_mctrl(state->uart_port, TIOCM_RTS); 609ab4382d2SGreg Kroah-Hartman } 610ab4382d2SGreg Kroah-Hartman 611ab4382d2SGreg Kroah-Hartman static void uart_unthrottle(struct tty_struct *tty) 612ab4382d2SGreg Kroah-Hartman { 613ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 614ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 615ab4382d2SGreg Kroah-Hartman 616ab4382d2SGreg Kroah-Hartman if (I_IXOFF(tty)) { 617ab4382d2SGreg Kroah-Hartman if (port->x_char) 618ab4382d2SGreg Kroah-Hartman port->x_char = 0; 619ab4382d2SGreg Kroah-Hartman else 620ab4382d2SGreg Kroah-Hartman uart_send_xchar(tty, START_CHAR(tty)); 621ab4382d2SGreg Kroah-Hartman } 622ab4382d2SGreg Kroah-Hartman 623ab4382d2SGreg Kroah-Hartman if (tty->termios->c_cflag & CRTSCTS) 624ab4382d2SGreg Kroah-Hartman uart_set_mctrl(port, TIOCM_RTS); 625ab4382d2SGreg Kroah-Hartman } 626ab4382d2SGreg Kroah-Hartman 627ab4382d2SGreg Kroah-Hartman static int uart_get_info(struct uart_state *state, 628ab4382d2SGreg Kroah-Hartman struct serial_struct __user *retinfo) 629ab4382d2SGreg Kroah-Hartman { 630ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 631ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 632ab4382d2SGreg Kroah-Hartman struct serial_struct tmp; 633ab4382d2SGreg Kroah-Hartman 634ab4382d2SGreg Kroah-Hartman memset(&tmp, 0, sizeof(tmp)); 635ab4382d2SGreg Kroah-Hartman 636ab4382d2SGreg Kroah-Hartman /* Ensure the state we copy is consistent and no hardware changes 637ab4382d2SGreg Kroah-Hartman occur as we go */ 638ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 639ab4382d2SGreg Kroah-Hartman 640ab4382d2SGreg Kroah-Hartman tmp.type = uport->type; 641ab4382d2SGreg Kroah-Hartman tmp.line = uport->line; 642ab4382d2SGreg Kroah-Hartman tmp.port = uport->iobase; 643ab4382d2SGreg Kroah-Hartman if (HIGH_BITS_OFFSET) 644ab4382d2SGreg Kroah-Hartman tmp.port_high = (long) uport->iobase >> HIGH_BITS_OFFSET; 645ab4382d2SGreg Kroah-Hartman tmp.irq = uport->irq; 646ab4382d2SGreg Kroah-Hartman tmp.flags = uport->flags; 647ab4382d2SGreg Kroah-Hartman tmp.xmit_fifo_size = uport->fifosize; 648ab4382d2SGreg Kroah-Hartman tmp.baud_base = uport->uartclk / 16; 649ab4382d2SGreg Kroah-Hartman tmp.close_delay = port->close_delay / 10; 650ab4382d2SGreg Kroah-Hartman tmp.closing_wait = port->closing_wait == ASYNC_CLOSING_WAIT_NONE ? 651ab4382d2SGreg Kroah-Hartman ASYNC_CLOSING_WAIT_NONE : 652ab4382d2SGreg Kroah-Hartman port->closing_wait / 10; 653ab4382d2SGreg Kroah-Hartman tmp.custom_divisor = uport->custom_divisor; 654ab4382d2SGreg Kroah-Hartman tmp.hub6 = uport->hub6; 655ab4382d2SGreg Kroah-Hartman tmp.io_type = uport->iotype; 656ab4382d2SGreg Kroah-Hartman tmp.iomem_reg_shift = uport->regshift; 657ab4382d2SGreg Kroah-Hartman tmp.iomem_base = (void *)(unsigned long)uport->mapbase; 658ab4382d2SGreg Kroah-Hartman 659ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 660ab4382d2SGreg Kroah-Hartman 661ab4382d2SGreg Kroah-Hartman if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) 662ab4382d2SGreg Kroah-Hartman return -EFAULT; 663ab4382d2SGreg Kroah-Hartman return 0; 664ab4382d2SGreg Kroah-Hartman } 665ab4382d2SGreg Kroah-Hartman 666ab4382d2SGreg Kroah-Hartman static int uart_set_info(struct tty_struct *tty, struct uart_state *state, 667ab4382d2SGreg Kroah-Hartman struct serial_struct __user *newinfo) 668ab4382d2SGreg Kroah-Hartman { 669ab4382d2SGreg Kroah-Hartman struct serial_struct new_serial; 670ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 671ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 672ab4382d2SGreg Kroah-Hartman unsigned long new_port; 673ab4382d2SGreg Kroah-Hartman unsigned int change_irq, change_port, closing_wait; 674ab4382d2SGreg Kroah-Hartman unsigned int old_custom_divisor, close_delay; 675ab4382d2SGreg Kroah-Hartman upf_t old_flags, new_flags; 676ab4382d2SGreg Kroah-Hartman int retval = 0; 677ab4382d2SGreg Kroah-Hartman 678ab4382d2SGreg Kroah-Hartman if (copy_from_user(&new_serial, newinfo, sizeof(new_serial))) 679ab4382d2SGreg Kroah-Hartman return -EFAULT; 680ab4382d2SGreg Kroah-Hartman 681ab4382d2SGreg Kroah-Hartman new_port = new_serial.port; 682ab4382d2SGreg Kroah-Hartman if (HIGH_BITS_OFFSET) 683ab4382d2SGreg Kroah-Hartman new_port += (unsigned long) new_serial.port_high << HIGH_BITS_OFFSET; 684ab4382d2SGreg Kroah-Hartman 685ab4382d2SGreg Kroah-Hartman new_serial.irq = irq_canonicalize(new_serial.irq); 686ab4382d2SGreg Kroah-Hartman close_delay = new_serial.close_delay * 10; 687ab4382d2SGreg Kroah-Hartman closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ? 688ab4382d2SGreg Kroah-Hartman ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10; 689ab4382d2SGreg Kroah-Hartman 690ab4382d2SGreg Kroah-Hartman /* 691ab4382d2SGreg Kroah-Hartman * This semaphore protects port->count. It is also 692ab4382d2SGreg Kroah-Hartman * very useful to prevent opens. Also, take the 693ab4382d2SGreg Kroah-Hartman * port configuration semaphore to make sure that a 694ab4382d2SGreg Kroah-Hartman * module insertion/removal doesn't change anything 695ab4382d2SGreg Kroah-Hartman * under us. 696ab4382d2SGreg Kroah-Hartman */ 697ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 698ab4382d2SGreg Kroah-Hartman 699ab4382d2SGreg Kroah-Hartman change_irq = !(uport->flags & UPF_FIXED_PORT) 700ab4382d2SGreg Kroah-Hartman && new_serial.irq != uport->irq; 701ab4382d2SGreg Kroah-Hartman 702ab4382d2SGreg Kroah-Hartman /* 703ab4382d2SGreg Kroah-Hartman * Since changing the 'type' of the port changes its resource 704ab4382d2SGreg Kroah-Hartman * allocations, we should treat type changes the same as 705ab4382d2SGreg Kroah-Hartman * IO port changes. 706ab4382d2SGreg Kroah-Hartman */ 707ab4382d2SGreg Kroah-Hartman change_port = !(uport->flags & UPF_FIXED_PORT) 708ab4382d2SGreg Kroah-Hartman && (new_port != uport->iobase || 709ab4382d2SGreg Kroah-Hartman (unsigned long)new_serial.iomem_base != uport->mapbase || 710ab4382d2SGreg Kroah-Hartman new_serial.hub6 != uport->hub6 || 711ab4382d2SGreg Kroah-Hartman new_serial.io_type != uport->iotype || 712ab4382d2SGreg Kroah-Hartman new_serial.iomem_reg_shift != uport->regshift || 713ab4382d2SGreg Kroah-Hartman new_serial.type != uport->type); 714ab4382d2SGreg Kroah-Hartman 715ab4382d2SGreg Kroah-Hartman old_flags = uport->flags; 716ab4382d2SGreg Kroah-Hartman new_flags = new_serial.flags; 717ab4382d2SGreg Kroah-Hartman old_custom_divisor = uport->custom_divisor; 718ab4382d2SGreg Kroah-Hartman 719ab4382d2SGreg Kroah-Hartman if (!capable(CAP_SYS_ADMIN)) { 720ab4382d2SGreg Kroah-Hartman retval = -EPERM; 721ab4382d2SGreg Kroah-Hartman if (change_irq || change_port || 722ab4382d2SGreg Kroah-Hartman (new_serial.baud_base != uport->uartclk / 16) || 723ab4382d2SGreg Kroah-Hartman (close_delay != port->close_delay) || 724ab4382d2SGreg Kroah-Hartman (closing_wait != port->closing_wait) || 725ab4382d2SGreg Kroah-Hartman (new_serial.xmit_fifo_size && 726ab4382d2SGreg Kroah-Hartman new_serial.xmit_fifo_size != uport->fifosize) || 727ab4382d2SGreg Kroah-Hartman (((new_flags ^ old_flags) & ~UPF_USR_MASK) != 0)) 728ab4382d2SGreg Kroah-Hartman goto exit; 729ab4382d2SGreg Kroah-Hartman uport->flags = ((uport->flags & ~UPF_USR_MASK) | 730ab4382d2SGreg Kroah-Hartman (new_flags & UPF_USR_MASK)); 731ab4382d2SGreg Kroah-Hartman uport->custom_divisor = new_serial.custom_divisor; 732ab4382d2SGreg Kroah-Hartman goto check_and_exit; 733ab4382d2SGreg Kroah-Hartman } 734ab4382d2SGreg Kroah-Hartman 735ab4382d2SGreg Kroah-Hartman /* 736ab4382d2SGreg Kroah-Hartman * Ask the low level driver to verify the settings. 737ab4382d2SGreg Kroah-Hartman */ 738ab4382d2SGreg Kroah-Hartman if (uport->ops->verify_port) 739ab4382d2SGreg Kroah-Hartman retval = uport->ops->verify_port(uport, &new_serial); 740ab4382d2SGreg Kroah-Hartman 741ab4382d2SGreg Kroah-Hartman if ((new_serial.irq >= nr_irqs) || (new_serial.irq < 0) || 742ab4382d2SGreg Kroah-Hartman (new_serial.baud_base < 9600)) 743ab4382d2SGreg Kroah-Hartman retval = -EINVAL; 744ab4382d2SGreg Kroah-Hartman 745ab4382d2SGreg Kroah-Hartman if (retval) 746ab4382d2SGreg Kroah-Hartman goto exit; 747ab4382d2SGreg Kroah-Hartman 748ab4382d2SGreg Kroah-Hartman if (change_port || change_irq) { 749ab4382d2SGreg Kroah-Hartman retval = -EBUSY; 750ab4382d2SGreg Kroah-Hartman 751ab4382d2SGreg Kroah-Hartman /* 752ab4382d2SGreg Kroah-Hartman * Make sure that we are the sole user of this port. 753ab4382d2SGreg Kroah-Hartman */ 754ab4382d2SGreg Kroah-Hartman if (tty_port_users(port) > 1) 755ab4382d2SGreg Kroah-Hartman goto exit; 756ab4382d2SGreg Kroah-Hartman 757ab4382d2SGreg Kroah-Hartman /* 758ab4382d2SGreg Kroah-Hartman * We need to shutdown the serial port at the old 759ab4382d2SGreg Kroah-Hartman * port/type/irq combination. 760ab4382d2SGreg Kroah-Hartman */ 761ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 762ab4382d2SGreg Kroah-Hartman } 763ab4382d2SGreg Kroah-Hartman 764ab4382d2SGreg Kroah-Hartman if (change_port) { 765ab4382d2SGreg Kroah-Hartman unsigned long old_iobase, old_mapbase; 766ab4382d2SGreg Kroah-Hartman unsigned int old_type, old_iotype, old_hub6, old_shift; 767ab4382d2SGreg Kroah-Hartman 768ab4382d2SGreg Kroah-Hartman old_iobase = uport->iobase; 769ab4382d2SGreg Kroah-Hartman old_mapbase = uport->mapbase; 770ab4382d2SGreg Kroah-Hartman old_type = uport->type; 771ab4382d2SGreg Kroah-Hartman old_hub6 = uport->hub6; 772ab4382d2SGreg Kroah-Hartman old_iotype = uport->iotype; 773ab4382d2SGreg Kroah-Hartman old_shift = uport->regshift; 774ab4382d2SGreg Kroah-Hartman 775ab4382d2SGreg Kroah-Hartman /* 776ab4382d2SGreg Kroah-Hartman * Free and release old regions 777ab4382d2SGreg Kroah-Hartman */ 778ab4382d2SGreg Kroah-Hartman if (old_type != PORT_UNKNOWN) 779ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 780ab4382d2SGreg Kroah-Hartman 781ab4382d2SGreg Kroah-Hartman uport->iobase = new_port; 782ab4382d2SGreg Kroah-Hartman uport->type = new_serial.type; 783ab4382d2SGreg Kroah-Hartman uport->hub6 = new_serial.hub6; 784ab4382d2SGreg Kroah-Hartman uport->iotype = new_serial.io_type; 785ab4382d2SGreg Kroah-Hartman uport->regshift = new_serial.iomem_reg_shift; 786ab4382d2SGreg Kroah-Hartman uport->mapbase = (unsigned long)new_serial.iomem_base; 787ab4382d2SGreg Kroah-Hartman 788ab4382d2SGreg Kroah-Hartman /* 789ab4382d2SGreg Kroah-Hartman * Claim and map the new regions 790ab4382d2SGreg Kroah-Hartman */ 791ab4382d2SGreg Kroah-Hartman if (uport->type != PORT_UNKNOWN) { 792ab4382d2SGreg Kroah-Hartman retval = uport->ops->request_port(uport); 793ab4382d2SGreg Kroah-Hartman } else { 794ab4382d2SGreg Kroah-Hartman /* Always success - Jean II */ 795ab4382d2SGreg Kroah-Hartman retval = 0; 796ab4382d2SGreg Kroah-Hartman } 797ab4382d2SGreg Kroah-Hartman 798ab4382d2SGreg Kroah-Hartman /* 799ab4382d2SGreg Kroah-Hartman * If we fail to request resources for the 800ab4382d2SGreg Kroah-Hartman * new port, try to restore the old settings. 801ab4382d2SGreg Kroah-Hartman */ 802ab4382d2SGreg Kroah-Hartman if (retval && old_type != PORT_UNKNOWN) { 803ab4382d2SGreg Kroah-Hartman uport->iobase = old_iobase; 804ab4382d2SGreg Kroah-Hartman uport->type = old_type; 805ab4382d2SGreg Kroah-Hartman uport->hub6 = old_hub6; 806ab4382d2SGreg Kroah-Hartman uport->iotype = old_iotype; 807ab4382d2SGreg Kroah-Hartman uport->regshift = old_shift; 808ab4382d2SGreg Kroah-Hartman uport->mapbase = old_mapbase; 809ab4382d2SGreg Kroah-Hartman retval = uport->ops->request_port(uport); 810ab4382d2SGreg Kroah-Hartman /* 811ab4382d2SGreg Kroah-Hartman * If we failed to restore the old settings, 812ab4382d2SGreg Kroah-Hartman * we fail like this. 813ab4382d2SGreg Kroah-Hartman */ 814ab4382d2SGreg Kroah-Hartman if (retval) 815ab4382d2SGreg Kroah-Hartman uport->type = PORT_UNKNOWN; 816ab4382d2SGreg Kroah-Hartman 817ab4382d2SGreg Kroah-Hartman /* 818ab4382d2SGreg Kroah-Hartman * We failed anyway. 819ab4382d2SGreg Kroah-Hartman */ 820ab4382d2SGreg Kroah-Hartman retval = -EBUSY; 821ab4382d2SGreg Kroah-Hartman /* Added to return the correct error -Ram Gupta */ 822ab4382d2SGreg Kroah-Hartman goto exit; 823ab4382d2SGreg Kroah-Hartman } 824ab4382d2SGreg Kroah-Hartman } 825ab4382d2SGreg Kroah-Hartman 826ab4382d2SGreg Kroah-Hartman if (change_irq) 827ab4382d2SGreg Kroah-Hartman uport->irq = new_serial.irq; 828ab4382d2SGreg Kroah-Hartman if (!(uport->flags & UPF_FIXED_PORT)) 829ab4382d2SGreg Kroah-Hartman uport->uartclk = new_serial.baud_base * 16; 830ab4382d2SGreg Kroah-Hartman uport->flags = (uport->flags & ~UPF_CHANGE_MASK) | 831ab4382d2SGreg Kroah-Hartman (new_flags & UPF_CHANGE_MASK); 832ab4382d2SGreg Kroah-Hartman uport->custom_divisor = new_serial.custom_divisor; 833ab4382d2SGreg Kroah-Hartman port->close_delay = close_delay; 834ab4382d2SGreg Kroah-Hartman port->closing_wait = closing_wait; 835ab4382d2SGreg Kroah-Hartman if (new_serial.xmit_fifo_size) 836ab4382d2SGreg Kroah-Hartman uport->fifosize = new_serial.xmit_fifo_size; 837ab4382d2SGreg Kroah-Hartman if (port->tty) 838ab4382d2SGreg Kroah-Hartman port->tty->low_latency = 839ab4382d2SGreg Kroah-Hartman (uport->flags & UPF_LOW_LATENCY) ? 1 : 0; 840ab4382d2SGreg Kroah-Hartman 841ab4382d2SGreg Kroah-Hartman check_and_exit: 842ab4382d2SGreg Kroah-Hartman retval = 0; 843ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) 844ab4382d2SGreg Kroah-Hartman goto exit; 845ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_INITIALIZED) { 846ab4382d2SGreg Kroah-Hartman if (((old_flags ^ uport->flags) & UPF_SPD_MASK) || 847ab4382d2SGreg Kroah-Hartman old_custom_divisor != uport->custom_divisor) { 848ab4382d2SGreg Kroah-Hartman /* 849ab4382d2SGreg Kroah-Hartman * If they're setting up a custom divisor or speed, 850ab4382d2SGreg Kroah-Hartman * instead of clearing it, then bitch about it. No 851ab4382d2SGreg Kroah-Hartman * need to rate-limit; it's CAP_SYS_ADMIN only. 852ab4382d2SGreg Kroah-Hartman */ 853ab4382d2SGreg Kroah-Hartman if (uport->flags & UPF_SPD_MASK) { 854ab4382d2SGreg Kroah-Hartman char buf[64]; 855ab4382d2SGreg Kroah-Hartman printk(KERN_NOTICE 856ab4382d2SGreg Kroah-Hartman "%s sets custom speed on %s. This " 857ab4382d2SGreg Kroah-Hartman "is deprecated.\n", current->comm, 858ab4382d2SGreg Kroah-Hartman tty_name(port->tty, buf)); 859ab4382d2SGreg Kroah-Hartman } 860ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 861ab4382d2SGreg Kroah-Hartman } 862ab4382d2SGreg Kroah-Hartman } else 863ab4382d2SGreg Kroah-Hartman retval = uart_startup(tty, state, 1); 864ab4382d2SGreg Kroah-Hartman exit: 865ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 866ab4382d2SGreg Kroah-Hartman return retval; 867ab4382d2SGreg Kroah-Hartman } 868ab4382d2SGreg Kroah-Hartman 869ab4382d2SGreg Kroah-Hartman /** 870ab4382d2SGreg Kroah-Hartman * uart_get_lsr_info - get line status register info 871ab4382d2SGreg Kroah-Hartman * @tty: tty associated with the UART 872ab4382d2SGreg Kroah-Hartman * @state: UART being queried 873ab4382d2SGreg Kroah-Hartman * @value: returned modem value 874ab4382d2SGreg Kroah-Hartman * 875ab4382d2SGreg Kroah-Hartman * Note: uart_ioctl protects us against hangups. 876ab4382d2SGreg Kroah-Hartman */ 877ab4382d2SGreg Kroah-Hartman static int uart_get_lsr_info(struct tty_struct *tty, 878ab4382d2SGreg Kroah-Hartman struct uart_state *state, unsigned int __user *value) 879ab4382d2SGreg Kroah-Hartman { 880ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 881ab4382d2SGreg Kroah-Hartman unsigned int result; 882ab4382d2SGreg Kroah-Hartman 883ab4382d2SGreg Kroah-Hartman result = uport->ops->tx_empty(uport); 884ab4382d2SGreg Kroah-Hartman 885ab4382d2SGreg Kroah-Hartman /* 886ab4382d2SGreg Kroah-Hartman * If we're about to load something into the transmit 887ab4382d2SGreg Kroah-Hartman * register, we'll pretend the transmitter isn't empty to 888ab4382d2SGreg Kroah-Hartman * avoid a race condition (depending on when the transmit 889ab4382d2SGreg Kroah-Hartman * interrupt happens). 890ab4382d2SGreg Kroah-Hartman */ 891ab4382d2SGreg Kroah-Hartman if (uport->x_char || 892ab4382d2SGreg Kroah-Hartman ((uart_circ_chars_pending(&state->xmit) > 0) && 893ab4382d2SGreg Kroah-Hartman !tty->stopped && !tty->hw_stopped)) 894ab4382d2SGreg Kroah-Hartman result &= ~TIOCSER_TEMT; 895ab4382d2SGreg Kroah-Hartman 896ab4382d2SGreg Kroah-Hartman return put_user(result, value); 897ab4382d2SGreg Kroah-Hartman } 898ab4382d2SGreg Kroah-Hartman 89960b33c13SAlan Cox static int uart_tiocmget(struct tty_struct *tty) 900ab4382d2SGreg Kroah-Hartman { 901ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 902ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 903ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 904ab4382d2SGreg Kroah-Hartman int result = -EIO; 905ab4382d2SGreg Kroah-Hartman 906ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 90760b33c13SAlan Cox if (!(tty->flags & (1 << TTY_IO_ERROR))) { 908ab4382d2SGreg Kroah-Hartman result = uport->mctrl; 909ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 910ab4382d2SGreg Kroah-Hartman result |= uport->ops->get_mctrl(uport); 911ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 912ab4382d2SGreg Kroah-Hartman } 913ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 914ab4382d2SGreg Kroah-Hartman 915ab4382d2SGreg Kroah-Hartman return result; 916ab4382d2SGreg Kroah-Hartman } 917ab4382d2SGreg Kroah-Hartman 918ab4382d2SGreg Kroah-Hartman static int 91920b9d177SAlan Cox uart_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear) 920ab4382d2SGreg Kroah-Hartman { 921ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 922ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 923ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 924ab4382d2SGreg Kroah-Hartman int ret = -EIO; 925ab4382d2SGreg Kroah-Hartman 926ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 92720b9d177SAlan Cox if (!(tty->flags & (1 << TTY_IO_ERROR))) { 928ab4382d2SGreg Kroah-Hartman uart_update_mctrl(uport, set, clear); 929ab4382d2SGreg Kroah-Hartman ret = 0; 930ab4382d2SGreg Kroah-Hartman } 931ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 932ab4382d2SGreg Kroah-Hartman return ret; 933ab4382d2SGreg Kroah-Hartman } 934ab4382d2SGreg Kroah-Hartman 935ab4382d2SGreg Kroah-Hartman static int uart_break_ctl(struct tty_struct *tty, int break_state) 936ab4382d2SGreg Kroah-Hartman { 937ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 938ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 939ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 940ab4382d2SGreg Kroah-Hartman 941ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 942ab4382d2SGreg Kroah-Hartman 943ab4382d2SGreg Kroah-Hartman if (uport->type != PORT_UNKNOWN) 944ab4382d2SGreg Kroah-Hartman uport->ops->break_ctl(uport, break_state); 945ab4382d2SGreg Kroah-Hartman 946ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 947ab4382d2SGreg Kroah-Hartman return 0; 948ab4382d2SGreg Kroah-Hartman } 949ab4382d2SGreg Kroah-Hartman 950ab4382d2SGreg Kroah-Hartman static int uart_do_autoconfig(struct tty_struct *tty,struct uart_state *state) 951ab4382d2SGreg Kroah-Hartman { 952ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 953ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 954ab4382d2SGreg Kroah-Hartman int flags, ret; 955ab4382d2SGreg Kroah-Hartman 956ab4382d2SGreg Kroah-Hartman if (!capable(CAP_SYS_ADMIN)) 957ab4382d2SGreg Kroah-Hartman return -EPERM; 958ab4382d2SGreg Kroah-Hartman 959ab4382d2SGreg Kroah-Hartman /* 960ab4382d2SGreg Kroah-Hartman * Take the per-port semaphore. This prevents count from 961ab4382d2SGreg Kroah-Hartman * changing, and hence any extra opens of the port while 962ab4382d2SGreg Kroah-Hartman * we're auto-configuring. 963ab4382d2SGreg Kroah-Hartman */ 964ab4382d2SGreg Kroah-Hartman if (mutex_lock_interruptible(&port->mutex)) 965ab4382d2SGreg Kroah-Hartman return -ERESTARTSYS; 966ab4382d2SGreg Kroah-Hartman 967ab4382d2SGreg Kroah-Hartman ret = -EBUSY; 968ab4382d2SGreg Kroah-Hartman if (tty_port_users(port) == 1) { 969ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 970ab4382d2SGreg Kroah-Hartman 971ab4382d2SGreg Kroah-Hartman /* 972ab4382d2SGreg Kroah-Hartman * If we already have a port type configured, 973ab4382d2SGreg Kroah-Hartman * we must release its resources. 974ab4382d2SGreg Kroah-Hartman */ 975ab4382d2SGreg Kroah-Hartman if (uport->type != PORT_UNKNOWN) 976ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 977ab4382d2SGreg Kroah-Hartman 978ab4382d2SGreg Kroah-Hartman flags = UART_CONFIG_TYPE; 979ab4382d2SGreg Kroah-Hartman if (uport->flags & UPF_AUTO_IRQ) 980ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_IRQ; 981ab4382d2SGreg Kroah-Hartman 982ab4382d2SGreg Kroah-Hartman /* 983ab4382d2SGreg Kroah-Hartman * This will claim the ports resources if 984ab4382d2SGreg Kroah-Hartman * a port is found. 985ab4382d2SGreg Kroah-Hartman */ 986ab4382d2SGreg Kroah-Hartman uport->ops->config_port(uport, flags); 987ab4382d2SGreg Kroah-Hartman 988ab4382d2SGreg Kroah-Hartman ret = uart_startup(tty, state, 1); 989ab4382d2SGreg Kroah-Hartman } 990ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 991ab4382d2SGreg Kroah-Hartman return ret; 992ab4382d2SGreg Kroah-Hartman } 993ab4382d2SGreg Kroah-Hartman 994ab4382d2SGreg Kroah-Hartman /* 995ab4382d2SGreg Kroah-Hartman * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change 996ab4382d2SGreg Kroah-Hartman * - mask passed in arg for lines of interest 997ab4382d2SGreg Kroah-Hartman * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) 998ab4382d2SGreg Kroah-Hartman * Caller should use TIOCGICOUNT to see which one it was 999ab4382d2SGreg Kroah-Hartman * 1000ab4382d2SGreg Kroah-Hartman * FIXME: This wants extracting into a common all driver implementation 1001ab4382d2SGreg Kroah-Hartman * of TIOCMWAIT using tty_port. 1002ab4382d2SGreg Kroah-Hartman */ 1003ab4382d2SGreg Kroah-Hartman static int 1004ab4382d2SGreg Kroah-Hartman uart_wait_modem_status(struct uart_state *state, unsigned long arg) 1005ab4382d2SGreg Kroah-Hartman { 1006ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1007ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1008ab4382d2SGreg Kroah-Hartman DECLARE_WAITQUEUE(wait, current); 1009ab4382d2SGreg Kroah-Hartman struct uart_icount cprev, cnow; 1010ab4382d2SGreg Kroah-Hartman int ret; 1011ab4382d2SGreg Kroah-Hartman 1012ab4382d2SGreg Kroah-Hartman /* 1013ab4382d2SGreg Kroah-Hartman * note the counters on entry 1014ab4382d2SGreg Kroah-Hartman */ 1015ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1016ab4382d2SGreg Kroah-Hartman memcpy(&cprev, &uport->icount, sizeof(struct uart_icount)); 1017ab4382d2SGreg Kroah-Hartman 1018ab4382d2SGreg Kroah-Hartman /* 1019ab4382d2SGreg Kroah-Hartman * Force modem status interrupts on 1020ab4382d2SGreg Kroah-Hartman */ 1021ab4382d2SGreg Kroah-Hartman uport->ops->enable_ms(uport); 1022ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1023ab4382d2SGreg Kroah-Hartman 1024ab4382d2SGreg Kroah-Hartman add_wait_queue(&port->delta_msr_wait, &wait); 1025ab4382d2SGreg Kroah-Hartman for (;;) { 1026ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1027ab4382d2SGreg Kroah-Hartman memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); 1028ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1029ab4382d2SGreg Kroah-Hartman 1030ab4382d2SGreg Kroah-Hartman set_current_state(TASK_INTERRUPTIBLE); 1031ab4382d2SGreg Kroah-Hartman 1032ab4382d2SGreg Kroah-Hartman if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || 1033ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || 1034ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || 1035ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) { 1036ab4382d2SGreg Kroah-Hartman ret = 0; 1037ab4382d2SGreg Kroah-Hartman break; 1038ab4382d2SGreg Kroah-Hartman } 1039ab4382d2SGreg Kroah-Hartman 1040ab4382d2SGreg Kroah-Hartman schedule(); 1041ab4382d2SGreg Kroah-Hartman 1042ab4382d2SGreg Kroah-Hartman /* see if a signal did it */ 1043ab4382d2SGreg Kroah-Hartman if (signal_pending(current)) { 1044ab4382d2SGreg Kroah-Hartman ret = -ERESTARTSYS; 1045ab4382d2SGreg Kroah-Hartman break; 1046ab4382d2SGreg Kroah-Hartman } 1047ab4382d2SGreg Kroah-Hartman 1048ab4382d2SGreg Kroah-Hartman cprev = cnow; 1049ab4382d2SGreg Kroah-Hartman } 1050ab4382d2SGreg Kroah-Hartman 1051ab4382d2SGreg Kroah-Hartman current->state = TASK_RUNNING; 1052ab4382d2SGreg Kroah-Hartman remove_wait_queue(&port->delta_msr_wait, &wait); 1053ab4382d2SGreg Kroah-Hartman 1054ab4382d2SGreg Kroah-Hartman return ret; 1055ab4382d2SGreg Kroah-Hartman } 1056ab4382d2SGreg Kroah-Hartman 1057ab4382d2SGreg Kroah-Hartman /* 1058ab4382d2SGreg Kroah-Hartman * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) 1059ab4382d2SGreg Kroah-Hartman * Return: write counters to the user passed counter struct 1060ab4382d2SGreg Kroah-Hartman * NB: both 1->0 and 0->1 transitions are counted except for 1061ab4382d2SGreg Kroah-Hartman * RI where only 0->1 is counted. 1062ab4382d2SGreg Kroah-Hartman */ 1063ab4382d2SGreg Kroah-Hartman static int uart_get_icount(struct tty_struct *tty, 1064ab4382d2SGreg Kroah-Hartman struct serial_icounter_struct *icount) 1065ab4382d2SGreg Kroah-Hartman { 1066ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1067ab4382d2SGreg Kroah-Hartman struct uart_icount cnow; 1068ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1069ab4382d2SGreg Kroah-Hartman 1070ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1071ab4382d2SGreg Kroah-Hartman memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); 1072ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1073ab4382d2SGreg Kroah-Hartman 1074ab4382d2SGreg Kroah-Hartman icount->cts = cnow.cts; 1075ab4382d2SGreg Kroah-Hartman icount->dsr = cnow.dsr; 1076ab4382d2SGreg Kroah-Hartman icount->rng = cnow.rng; 1077ab4382d2SGreg Kroah-Hartman icount->dcd = cnow.dcd; 1078ab4382d2SGreg Kroah-Hartman icount->rx = cnow.rx; 1079ab4382d2SGreg Kroah-Hartman icount->tx = cnow.tx; 1080ab4382d2SGreg Kroah-Hartman icount->frame = cnow.frame; 1081ab4382d2SGreg Kroah-Hartman icount->overrun = cnow.overrun; 1082ab4382d2SGreg Kroah-Hartman icount->parity = cnow.parity; 1083ab4382d2SGreg Kroah-Hartman icount->brk = cnow.brk; 1084ab4382d2SGreg Kroah-Hartman icount->buf_overrun = cnow.buf_overrun; 1085ab4382d2SGreg Kroah-Hartman 1086ab4382d2SGreg Kroah-Hartman return 0; 1087ab4382d2SGreg Kroah-Hartman } 1088ab4382d2SGreg Kroah-Hartman 1089ab4382d2SGreg Kroah-Hartman /* 1090ab4382d2SGreg Kroah-Hartman * Called via sys_ioctl. We can use spin_lock_irq() here. 1091ab4382d2SGreg Kroah-Hartman */ 1092ab4382d2SGreg Kroah-Hartman static int 10936caa76b7SAlan Cox uart_ioctl(struct tty_struct *tty, unsigned int cmd, 1094ab4382d2SGreg Kroah-Hartman unsigned long arg) 1095ab4382d2SGreg Kroah-Hartman { 1096ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1097ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1098ab4382d2SGreg Kroah-Hartman void __user *uarg = (void __user *)arg; 1099ab4382d2SGreg Kroah-Hartman int ret = -ENOIOCTLCMD; 1100ab4382d2SGreg Kroah-Hartman 1101ab4382d2SGreg Kroah-Hartman 1102ab4382d2SGreg Kroah-Hartman /* 1103ab4382d2SGreg Kroah-Hartman * These ioctls don't rely on the hardware to be present. 1104ab4382d2SGreg Kroah-Hartman */ 1105ab4382d2SGreg Kroah-Hartman switch (cmd) { 1106ab4382d2SGreg Kroah-Hartman case TIOCGSERIAL: 1107ab4382d2SGreg Kroah-Hartman ret = uart_get_info(state, uarg); 1108ab4382d2SGreg Kroah-Hartman break; 1109ab4382d2SGreg Kroah-Hartman 1110ab4382d2SGreg Kroah-Hartman case TIOCSSERIAL: 1111ab4382d2SGreg Kroah-Hartman ret = uart_set_info(tty, state, uarg); 1112ab4382d2SGreg Kroah-Hartman break; 1113ab4382d2SGreg Kroah-Hartman 1114ab4382d2SGreg Kroah-Hartman case TIOCSERCONFIG: 1115ab4382d2SGreg Kroah-Hartman ret = uart_do_autoconfig(tty, state); 1116ab4382d2SGreg Kroah-Hartman break; 1117ab4382d2SGreg Kroah-Hartman 1118ab4382d2SGreg Kroah-Hartman case TIOCSERGWILD: /* obsolete */ 1119ab4382d2SGreg Kroah-Hartman case TIOCSERSWILD: /* obsolete */ 1120ab4382d2SGreg Kroah-Hartman ret = 0; 1121ab4382d2SGreg Kroah-Hartman break; 1122ab4382d2SGreg Kroah-Hartman } 1123ab4382d2SGreg Kroah-Hartman 1124ab4382d2SGreg Kroah-Hartman if (ret != -ENOIOCTLCMD) 1125ab4382d2SGreg Kroah-Hartman goto out; 1126ab4382d2SGreg Kroah-Hartman 1127ab4382d2SGreg Kroah-Hartman if (tty->flags & (1 << TTY_IO_ERROR)) { 1128ab4382d2SGreg Kroah-Hartman ret = -EIO; 1129ab4382d2SGreg Kroah-Hartman goto out; 1130ab4382d2SGreg Kroah-Hartman } 1131ab4382d2SGreg Kroah-Hartman 1132ab4382d2SGreg Kroah-Hartman /* 1133ab4382d2SGreg Kroah-Hartman * The following should only be used when hardware is present. 1134ab4382d2SGreg Kroah-Hartman */ 1135ab4382d2SGreg Kroah-Hartman switch (cmd) { 1136ab4382d2SGreg Kroah-Hartman case TIOCMIWAIT: 1137ab4382d2SGreg Kroah-Hartman ret = uart_wait_modem_status(state, arg); 1138ab4382d2SGreg Kroah-Hartman break; 1139ab4382d2SGreg Kroah-Hartman } 1140ab4382d2SGreg Kroah-Hartman 1141ab4382d2SGreg Kroah-Hartman if (ret != -ENOIOCTLCMD) 1142ab4382d2SGreg Kroah-Hartman goto out; 1143ab4382d2SGreg Kroah-Hartman 1144ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1145ab4382d2SGreg Kroah-Hartman 11466caa76b7SAlan Cox if (tty->flags & (1 << TTY_IO_ERROR)) { 1147ab4382d2SGreg Kroah-Hartman ret = -EIO; 1148ab4382d2SGreg Kroah-Hartman goto out_up; 1149ab4382d2SGreg Kroah-Hartman } 1150ab4382d2SGreg Kroah-Hartman 1151ab4382d2SGreg Kroah-Hartman /* 1152ab4382d2SGreg Kroah-Hartman * All these rely on hardware being present and need to be 1153ab4382d2SGreg Kroah-Hartman * protected against the tty being hung up. 1154ab4382d2SGreg Kroah-Hartman */ 1155ab4382d2SGreg Kroah-Hartman switch (cmd) { 1156ab4382d2SGreg Kroah-Hartman case TIOCSERGETLSR: /* Get line status register */ 1157ab4382d2SGreg Kroah-Hartman ret = uart_get_lsr_info(tty, state, uarg); 1158ab4382d2SGreg Kroah-Hartman break; 1159ab4382d2SGreg Kroah-Hartman 1160ab4382d2SGreg Kroah-Hartman default: { 1161ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1162ab4382d2SGreg Kroah-Hartman if (uport->ops->ioctl) 1163ab4382d2SGreg Kroah-Hartman ret = uport->ops->ioctl(uport, cmd, arg); 1164ab4382d2SGreg Kroah-Hartman break; 1165ab4382d2SGreg Kroah-Hartman } 1166ab4382d2SGreg Kroah-Hartman } 1167ab4382d2SGreg Kroah-Hartman out_up: 1168ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1169ab4382d2SGreg Kroah-Hartman out: 1170ab4382d2SGreg Kroah-Hartman return ret; 1171ab4382d2SGreg Kroah-Hartman } 1172ab4382d2SGreg Kroah-Hartman 1173ab4382d2SGreg Kroah-Hartman static void uart_set_ldisc(struct tty_struct *tty) 1174ab4382d2SGreg Kroah-Hartman { 1175ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1176ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1177ab4382d2SGreg Kroah-Hartman 1178ab4382d2SGreg Kroah-Hartman if (uport->ops->set_ldisc) 1179ab4382d2SGreg Kroah-Hartman uport->ops->set_ldisc(uport, tty->termios->c_line); 1180ab4382d2SGreg Kroah-Hartman } 1181ab4382d2SGreg Kroah-Hartman 1182ab4382d2SGreg Kroah-Hartman static void uart_set_termios(struct tty_struct *tty, 1183ab4382d2SGreg Kroah-Hartman struct ktermios *old_termios) 1184ab4382d2SGreg Kroah-Hartman { 1185ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1186ab4382d2SGreg Kroah-Hartman unsigned long flags; 1187ab4382d2SGreg Kroah-Hartman unsigned int cflag = tty->termios->c_cflag; 1188ab4382d2SGreg Kroah-Hartman 1189ab4382d2SGreg Kroah-Hartman 1190ab4382d2SGreg Kroah-Hartman /* 1191ab4382d2SGreg Kroah-Hartman * These are the bits that are used to setup various 1192ab4382d2SGreg Kroah-Hartman * flags in the low level driver. We can ignore the Bfoo 1193ab4382d2SGreg Kroah-Hartman * bits in c_cflag; c_[io]speed will always be set 1194ab4382d2SGreg Kroah-Hartman * appropriately by set_termios() in tty_ioctl.c 1195ab4382d2SGreg Kroah-Hartman */ 1196ab4382d2SGreg Kroah-Hartman #define RELEVANT_IFLAG(iflag) ((iflag) & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK)) 1197ab4382d2SGreg Kroah-Hartman if ((cflag ^ old_termios->c_cflag) == 0 && 1198ab4382d2SGreg Kroah-Hartman tty->termios->c_ospeed == old_termios->c_ospeed && 1199ab4382d2SGreg Kroah-Hartman tty->termios->c_ispeed == old_termios->c_ispeed && 1200ab4382d2SGreg Kroah-Hartman RELEVANT_IFLAG(tty->termios->c_iflag ^ old_termios->c_iflag) == 0) { 1201ab4382d2SGreg Kroah-Hartman return; 1202ab4382d2SGreg Kroah-Hartman } 1203ab4382d2SGreg Kroah-Hartman 1204ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, old_termios); 1205ab4382d2SGreg Kroah-Hartman 1206ab4382d2SGreg Kroah-Hartman /* Handle transition to B0 status */ 1207ab4382d2SGreg Kroah-Hartman if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) 1208ab4382d2SGreg Kroah-Hartman uart_clear_mctrl(state->uart_port, TIOCM_RTS | TIOCM_DTR); 1209ab4382d2SGreg Kroah-Hartman /* Handle transition away from B0 status */ 1210ab4382d2SGreg Kroah-Hartman else if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { 1211ab4382d2SGreg Kroah-Hartman unsigned int mask = TIOCM_DTR; 1212ab4382d2SGreg Kroah-Hartman if (!(cflag & CRTSCTS) || 1213ab4382d2SGreg Kroah-Hartman !test_bit(TTY_THROTTLED, &tty->flags)) 1214ab4382d2SGreg Kroah-Hartman mask |= TIOCM_RTS; 1215ab4382d2SGreg Kroah-Hartman uart_set_mctrl(state->uart_port, mask); 1216ab4382d2SGreg Kroah-Hartman } 1217ab4382d2SGreg Kroah-Hartman 1218ab4382d2SGreg Kroah-Hartman /* Handle turning off CRTSCTS */ 1219ab4382d2SGreg Kroah-Hartman if ((old_termios->c_cflag & CRTSCTS) && !(cflag & CRTSCTS)) { 1220ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&state->uart_port->lock, flags); 1221ab4382d2SGreg Kroah-Hartman tty->hw_stopped = 0; 1222ab4382d2SGreg Kroah-Hartman __uart_start(tty); 1223ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&state->uart_port->lock, flags); 1224ab4382d2SGreg Kroah-Hartman } 1225ab4382d2SGreg Kroah-Hartman /* Handle turning on CRTSCTS */ 1226ab4382d2SGreg Kroah-Hartman else if (!(old_termios->c_cflag & CRTSCTS) && (cflag & CRTSCTS)) { 1227ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&state->uart_port->lock, flags); 1228ab4382d2SGreg Kroah-Hartman if (!(state->uart_port->ops->get_mctrl(state->uart_port) & TIOCM_CTS)) { 1229ab4382d2SGreg Kroah-Hartman tty->hw_stopped = 1; 1230ab4382d2SGreg Kroah-Hartman state->uart_port->ops->stop_tx(state->uart_port); 1231ab4382d2SGreg Kroah-Hartman } 1232ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&state->uart_port->lock, flags); 1233ab4382d2SGreg Kroah-Hartman } 1234ab4382d2SGreg Kroah-Hartman } 1235ab4382d2SGreg Kroah-Hartman 1236ab4382d2SGreg Kroah-Hartman /* 1237ab4382d2SGreg Kroah-Hartman * In 2.4.5, calls to this will be serialized via the BKL in 1238ab4382d2SGreg Kroah-Hartman * linux/drivers/char/tty_io.c:tty_release() 1239ab4382d2SGreg Kroah-Hartman * linux/drivers/char/tty_io.c:do_tty_handup() 1240ab4382d2SGreg Kroah-Hartman */ 1241ab4382d2SGreg Kroah-Hartman static void uart_close(struct tty_struct *tty, struct file *filp) 1242ab4382d2SGreg Kroah-Hartman { 1243ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1244ab4382d2SGreg Kroah-Hartman struct tty_port *port; 1245ab4382d2SGreg Kroah-Hartman struct uart_port *uport; 1246ab4382d2SGreg Kroah-Hartman unsigned long flags; 1247ab4382d2SGreg Kroah-Hartman 1248ab4382d2SGreg Kroah-Hartman if (!state) 1249ab4382d2SGreg Kroah-Hartman return; 1250ab4382d2SGreg Kroah-Hartman 1251ab4382d2SGreg Kroah-Hartman uport = state->uart_port; 1252ab4382d2SGreg Kroah-Hartman port = &state->port; 1253ab4382d2SGreg Kroah-Hartman 1254ab4382d2SGreg Kroah-Hartman pr_debug("uart_close(%d) called\n", uport->line); 1255ab4382d2SGreg Kroah-Hartman 1256ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 1257ab4382d2SGreg Kroah-Hartman 1258ab4382d2SGreg Kroah-Hartman if (tty_hung_up_p(filp)) { 1259ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 1260ab4382d2SGreg Kroah-Hartman goto done; 1261ab4382d2SGreg Kroah-Hartman } 1262ab4382d2SGreg Kroah-Hartman 1263ab4382d2SGreg Kroah-Hartman if ((tty->count == 1) && (port->count != 1)) { 1264ab4382d2SGreg Kroah-Hartman /* 1265ab4382d2SGreg Kroah-Hartman * Uh, oh. tty->count is 1, which means that the tty 1266ab4382d2SGreg Kroah-Hartman * structure will be freed. port->count should always 1267ab4382d2SGreg Kroah-Hartman * be one in these conditions. If it's greater than 1268ab4382d2SGreg Kroah-Hartman * one, we've got real problems, since it means the 1269ab4382d2SGreg Kroah-Hartman * serial port won't be shutdown. 1270ab4382d2SGreg Kroah-Hartman */ 1271ab4382d2SGreg Kroah-Hartman printk(KERN_ERR "uart_close: bad serial port count; tty->count is 1, " 1272ab4382d2SGreg Kroah-Hartman "port->count is %d\n", port->count); 1273ab4382d2SGreg Kroah-Hartman port->count = 1; 1274ab4382d2SGreg Kroah-Hartman } 1275ab4382d2SGreg Kroah-Hartman if (--port->count < 0) { 1276ab4382d2SGreg Kroah-Hartman printk(KERN_ERR "uart_close: bad serial port count for %s: %d\n", 1277ab4382d2SGreg Kroah-Hartman tty->name, port->count); 1278ab4382d2SGreg Kroah-Hartman port->count = 0; 1279ab4382d2SGreg Kroah-Hartman } 1280ab4382d2SGreg Kroah-Hartman if (port->count) { 1281ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 1282ab4382d2SGreg Kroah-Hartman goto done; 1283ab4382d2SGreg Kroah-Hartman } 1284ab4382d2SGreg Kroah-Hartman 1285ab4382d2SGreg Kroah-Hartman /* 1286ab4382d2SGreg Kroah-Hartman * Now we wait for the transmit buffer to clear; and we notify 1287ab4382d2SGreg Kroah-Hartman * the line discipline to only process XON/XOFF characters by 1288ab4382d2SGreg Kroah-Hartman * setting tty->closing. 1289ab4382d2SGreg Kroah-Hartman */ 1290426929f8SJiri Slaby set_bit(ASYNCB_CLOSING, &port->flags); 1291ab4382d2SGreg Kroah-Hartman tty->closing = 1; 1292ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 1293ab4382d2SGreg Kroah-Hartman 12941f33a51dSJiri Slaby if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE) 12951f33a51dSJiri Slaby tty_wait_until_sent(tty, msecs_to_jiffies(port->closing_wait)); 1296ab4382d2SGreg Kroah-Hartman 1297ab4382d2SGreg Kroah-Hartman /* 1298ab4382d2SGreg Kroah-Hartman * At this point, we stop accepting input. To do this, we 1299ab4382d2SGreg Kroah-Hartman * disable the receive line status interrupts. 1300ab4382d2SGreg Kroah-Hartman */ 1301ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_INITIALIZED) { 1302ab4382d2SGreg Kroah-Hartman unsigned long flags; 1303ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&uport->lock, flags); 1304ab4382d2SGreg Kroah-Hartman uport->ops->stop_rx(uport); 1305ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&uport->lock, flags); 1306ab4382d2SGreg Kroah-Hartman /* 1307ab4382d2SGreg Kroah-Hartman * Before we drop DTR, make sure the UART transmitter 1308ab4382d2SGreg Kroah-Hartman * has completely drained; this is especially 1309ab4382d2SGreg Kroah-Hartman * important if there is a transmit FIFO! 1310ab4382d2SGreg Kroah-Hartman */ 13111f33a51dSJiri Slaby uart_wait_until_sent(tty, uport->timeout); 1312ab4382d2SGreg Kroah-Hartman } 1313ab4382d2SGreg Kroah-Hartman 1314bafb0bd2SJiri Slaby mutex_lock(&port->mutex); 1315ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 1316ab4382d2SGreg Kroah-Hartman uart_flush_buffer(tty); 1317ab4382d2SGreg Kroah-Hartman 1318ab4382d2SGreg Kroah-Hartman tty_ldisc_flush(tty); 1319ab4382d2SGreg Kroah-Hartman 1320ab4382d2SGreg Kroah-Hartman tty_port_tty_set(port, NULL); 1321ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 1322ab4382d2SGreg Kroah-Hartman tty->closing = 0; 1323ab4382d2SGreg Kroah-Hartman 1324ab4382d2SGreg Kroah-Hartman if (port->blocked_open) { 1325ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 1326ab4382d2SGreg Kroah-Hartman if (port->close_delay) 1327ab4382d2SGreg Kroah-Hartman msleep_interruptible(port->close_delay); 1328ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 1329ab4382d2SGreg Kroah-Hartman } else if (!uart_console(uport)) { 1330ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 1331ab4382d2SGreg Kroah-Hartman uart_change_pm(state, 3); 1332ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 1333ab4382d2SGreg Kroah-Hartman } 1334ab4382d2SGreg Kroah-Hartman 1335ab4382d2SGreg Kroah-Hartman /* 1336ab4382d2SGreg Kroah-Hartman * Wake up anyone trying to open this port. 1337ab4382d2SGreg Kroah-Hartman */ 1338ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); 1339426929f8SJiri Slaby clear_bit(ASYNCB_CLOSING, &port->flags); 1340ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 1341ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->open_wait); 1342426929f8SJiri Slaby wake_up_interruptible(&port->close_wait); 1343ab4382d2SGreg Kroah-Hartman 1344ab4382d2SGreg Kroah-Hartman done: 1345ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1346ab4382d2SGreg Kroah-Hartman } 1347ab4382d2SGreg Kroah-Hartman 13481f33a51dSJiri Slaby static void uart_wait_until_sent(struct tty_struct *tty, int timeout) 1349ab4382d2SGreg Kroah-Hartman { 13501f33a51dSJiri Slaby struct uart_state *state = tty->driver_data; 13511f33a51dSJiri Slaby struct uart_port *port = state->uart_port; 1352ab4382d2SGreg Kroah-Hartman unsigned long char_time, expire; 1353ab4382d2SGreg Kroah-Hartman 1354ab4382d2SGreg Kroah-Hartman if (port->type == PORT_UNKNOWN || port->fifosize == 0) 1355ab4382d2SGreg Kroah-Hartman return; 1356ab4382d2SGreg Kroah-Hartman 1357ab4382d2SGreg Kroah-Hartman /* 1358ab4382d2SGreg Kroah-Hartman * Set the check interval to be 1/5 of the estimated time to 1359ab4382d2SGreg Kroah-Hartman * send a single character, and make it at least 1. The check 1360ab4382d2SGreg Kroah-Hartman * interval should also be less than the timeout. 1361ab4382d2SGreg Kroah-Hartman * 1362ab4382d2SGreg Kroah-Hartman * Note: we have to use pretty tight timings here to satisfy 1363ab4382d2SGreg Kroah-Hartman * the NIST-PCTS. 1364ab4382d2SGreg Kroah-Hartman */ 1365ab4382d2SGreg Kroah-Hartman char_time = (port->timeout - HZ/50) / port->fifosize; 1366ab4382d2SGreg Kroah-Hartman char_time = char_time / 5; 1367ab4382d2SGreg Kroah-Hartman if (char_time == 0) 1368ab4382d2SGreg Kroah-Hartman char_time = 1; 1369ab4382d2SGreg Kroah-Hartman if (timeout && timeout < char_time) 1370ab4382d2SGreg Kroah-Hartman char_time = timeout; 1371ab4382d2SGreg Kroah-Hartman 1372ab4382d2SGreg Kroah-Hartman /* 1373ab4382d2SGreg Kroah-Hartman * If the transmitter hasn't cleared in twice the approximate 1374ab4382d2SGreg Kroah-Hartman * amount of time to send the entire FIFO, it probably won't 1375ab4382d2SGreg Kroah-Hartman * ever clear. This assumes the UART isn't doing flow 1376ab4382d2SGreg Kroah-Hartman * control, which is currently the case. Hence, if it ever 1377ab4382d2SGreg Kroah-Hartman * takes longer than port->timeout, this is probably due to a 1378ab4382d2SGreg Kroah-Hartman * UART bug of some kind. So, we clamp the timeout parameter at 1379ab4382d2SGreg Kroah-Hartman * 2*port->timeout. 1380ab4382d2SGreg Kroah-Hartman */ 1381ab4382d2SGreg Kroah-Hartman if (timeout == 0 || timeout > 2 * port->timeout) 1382ab4382d2SGreg Kroah-Hartman timeout = 2 * port->timeout; 1383ab4382d2SGreg Kroah-Hartman 1384ab4382d2SGreg Kroah-Hartman expire = jiffies + timeout; 1385ab4382d2SGreg Kroah-Hartman 1386ab4382d2SGreg Kroah-Hartman pr_debug("uart_wait_until_sent(%d), jiffies=%lu, expire=%lu...\n", 1387ab4382d2SGreg Kroah-Hartman port->line, jiffies, expire); 1388ab4382d2SGreg Kroah-Hartman 1389ab4382d2SGreg Kroah-Hartman /* 1390ab4382d2SGreg Kroah-Hartman * Check whether the transmitter is empty every 'char_time'. 1391ab4382d2SGreg Kroah-Hartman * 'timeout' / 'expire' give us the maximum amount of time 1392ab4382d2SGreg Kroah-Hartman * we wait. 1393ab4382d2SGreg Kroah-Hartman */ 1394ab4382d2SGreg Kroah-Hartman while (!port->ops->tx_empty(port)) { 1395ab4382d2SGreg Kroah-Hartman msleep_interruptible(jiffies_to_msecs(char_time)); 1396ab4382d2SGreg Kroah-Hartman if (signal_pending(current)) 1397ab4382d2SGreg Kroah-Hartman break; 1398ab4382d2SGreg Kroah-Hartman if (time_after(jiffies, expire)) 1399ab4382d2SGreg Kroah-Hartman break; 1400ab4382d2SGreg Kroah-Hartman } 1401ab4382d2SGreg Kroah-Hartman } 1402ab4382d2SGreg Kroah-Hartman 1403ab4382d2SGreg Kroah-Hartman /* 1404ab4382d2SGreg Kroah-Hartman * This is called with the BKL held in 1405ab4382d2SGreg Kroah-Hartman * linux/drivers/char/tty_io.c:do_tty_hangup() 1406ab4382d2SGreg Kroah-Hartman * We're called from the eventd thread, so we can sleep for 1407ab4382d2SGreg Kroah-Hartman * a _short_ time only. 1408ab4382d2SGreg Kroah-Hartman */ 1409ab4382d2SGreg Kroah-Hartman static void uart_hangup(struct tty_struct *tty) 1410ab4382d2SGreg Kroah-Hartman { 1411ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1412ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1413ab4382d2SGreg Kroah-Hartman unsigned long flags; 1414ab4382d2SGreg Kroah-Hartman 1415ab4382d2SGreg Kroah-Hartman pr_debug("uart_hangup(%d)\n", state->uart_port->line); 1416ab4382d2SGreg Kroah-Hartman 1417ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1418ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_NORMAL_ACTIVE) { 1419ab4382d2SGreg Kroah-Hartman uart_flush_buffer(tty); 1420ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 1421ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 1422ab4382d2SGreg Kroah-Hartman port->count = 0; 1423ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); 1424ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 1425ab4382d2SGreg Kroah-Hartman tty_port_tty_set(port, NULL); 1426ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->open_wait); 1427ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->delta_msr_wait); 1428ab4382d2SGreg Kroah-Hartman } 1429ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1430ab4382d2SGreg Kroah-Hartman } 1431ab4382d2SGreg Kroah-Hartman 1432ab4382d2SGreg Kroah-Hartman static int uart_carrier_raised(struct tty_port *port) 1433ab4382d2SGreg Kroah-Hartman { 1434ab4382d2SGreg Kroah-Hartman struct uart_state *state = container_of(port, struct uart_state, port); 1435ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1436ab4382d2SGreg Kroah-Hartman int mctrl; 1437ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1438ab4382d2SGreg Kroah-Hartman uport->ops->enable_ms(uport); 1439ab4382d2SGreg Kroah-Hartman mctrl = uport->ops->get_mctrl(uport); 1440ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1441ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_CAR) 1442ab4382d2SGreg Kroah-Hartman return 1; 1443ab4382d2SGreg Kroah-Hartman return 0; 1444ab4382d2SGreg Kroah-Hartman } 1445ab4382d2SGreg Kroah-Hartman 1446ab4382d2SGreg Kroah-Hartman static void uart_dtr_rts(struct tty_port *port, int onoff) 1447ab4382d2SGreg Kroah-Hartman { 1448ab4382d2SGreg Kroah-Hartman struct uart_state *state = container_of(port, struct uart_state, port); 1449ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1450ab4382d2SGreg Kroah-Hartman 14516f5c24adSJiri Slaby if (onoff) 1452ab4382d2SGreg Kroah-Hartman uart_set_mctrl(uport, TIOCM_DTR | TIOCM_RTS); 1453ab4382d2SGreg Kroah-Hartman else 1454ab4382d2SGreg Kroah-Hartman uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS); 1455ab4382d2SGreg Kroah-Hartman } 1456ab4382d2SGreg Kroah-Hartman 1457ab4382d2SGreg Kroah-Hartman static struct uart_state *uart_get(struct uart_driver *drv, int line) 1458ab4382d2SGreg Kroah-Hartman { 1459ab4382d2SGreg Kroah-Hartman struct uart_state *state; 1460ab4382d2SGreg Kroah-Hartman struct tty_port *port; 1461ab4382d2SGreg Kroah-Hartman int ret = 0; 1462ab4382d2SGreg Kroah-Hartman 1463ab4382d2SGreg Kroah-Hartman state = drv->state + line; 1464ab4382d2SGreg Kroah-Hartman port = &state->port; 1465ab4382d2SGreg Kroah-Hartman if (mutex_lock_interruptible(&port->mutex)) { 1466ab4382d2SGreg Kroah-Hartman ret = -ERESTARTSYS; 1467ab4382d2SGreg Kroah-Hartman goto err; 1468ab4382d2SGreg Kroah-Hartman } 1469ab4382d2SGreg Kroah-Hartman 1470ab4382d2SGreg Kroah-Hartman port->count++; 1471ab4382d2SGreg Kroah-Hartman if (!state->uart_port || state->uart_port->flags & UPF_DEAD) { 1472ab4382d2SGreg Kroah-Hartman ret = -ENXIO; 1473ab4382d2SGreg Kroah-Hartman goto err_unlock; 1474ab4382d2SGreg Kroah-Hartman } 1475ab4382d2SGreg Kroah-Hartman return state; 1476ab4382d2SGreg Kroah-Hartman 1477ab4382d2SGreg Kroah-Hartman err_unlock: 1478ab4382d2SGreg Kroah-Hartman port->count--; 1479ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1480ab4382d2SGreg Kroah-Hartman err: 1481ab4382d2SGreg Kroah-Hartman return ERR_PTR(ret); 1482ab4382d2SGreg Kroah-Hartman } 1483ab4382d2SGreg Kroah-Hartman 1484ab4382d2SGreg Kroah-Hartman /* 1485ab4382d2SGreg Kroah-Hartman * calls to uart_open are serialised by the BKL in 1486ab4382d2SGreg Kroah-Hartman * fs/char_dev.c:chrdev_open() 1487ab4382d2SGreg Kroah-Hartman * Note that if this fails, then uart_close() _will_ be called. 1488ab4382d2SGreg Kroah-Hartman * 1489ab4382d2SGreg Kroah-Hartman * In time, we want to scrap the "opening nonpresent ports" 1490ab4382d2SGreg Kroah-Hartman * behaviour and implement an alternative way for setserial 1491ab4382d2SGreg Kroah-Hartman * to set base addresses/ports/types. This will allow us to 1492ab4382d2SGreg Kroah-Hartman * get rid of a certain amount of extra tests. 1493ab4382d2SGreg Kroah-Hartman */ 1494ab4382d2SGreg Kroah-Hartman static int uart_open(struct tty_struct *tty, struct file *filp) 1495ab4382d2SGreg Kroah-Hartman { 1496ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = (struct uart_driver *)tty->driver->driver_state; 1497ab4382d2SGreg Kroah-Hartman struct uart_state *state; 1498ab4382d2SGreg Kroah-Hartman struct tty_port *port; 1499ab4382d2SGreg Kroah-Hartman int retval, line = tty->index; 1500ab4382d2SGreg Kroah-Hartman 1501ab4382d2SGreg Kroah-Hartman pr_debug("uart_open(%d) called\n", line); 1502ab4382d2SGreg Kroah-Hartman 1503ab4382d2SGreg Kroah-Hartman /* 1504ab4382d2SGreg Kroah-Hartman * We take the semaphore inside uart_get to guarantee that we won't 1505ab4382d2SGreg Kroah-Hartman * be re-entered while allocating the state structure, or while we 1506ab4382d2SGreg Kroah-Hartman * request any IRQs that the driver may need. This also has the nice 1507ab4382d2SGreg Kroah-Hartman * side-effect that it delays the action of uart_hangup, so we can 1508ab4382d2SGreg Kroah-Hartman * guarantee that state->port.tty will always contain something 1509ab4382d2SGreg Kroah-Hartman * reasonable. 1510ab4382d2SGreg Kroah-Hartman */ 1511ab4382d2SGreg Kroah-Hartman state = uart_get(drv, line); 1512ab4382d2SGreg Kroah-Hartman if (IS_ERR(state)) { 1513ab4382d2SGreg Kroah-Hartman retval = PTR_ERR(state); 1514ab4382d2SGreg Kroah-Hartman goto fail; 1515ab4382d2SGreg Kroah-Hartman } 1516ab4382d2SGreg Kroah-Hartman port = &state->port; 1517ab4382d2SGreg Kroah-Hartman 1518ab4382d2SGreg Kroah-Hartman /* 1519ab4382d2SGreg Kroah-Hartman * Once we set tty->driver_data here, we are guaranteed that 1520ab4382d2SGreg Kroah-Hartman * uart_close() will decrement the driver module use count. 1521ab4382d2SGreg Kroah-Hartman * Any failures from here onwards should not touch the count. 1522ab4382d2SGreg Kroah-Hartman */ 1523ab4382d2SGreg Kroah-Hartman tty->driver_data = state; 1524ab4382d2SGreg Kroah-Hartman state->uart_port->state = state; 1525ab4382d2SGreg Kroah-Hartman tty->low_latency = (state->uart_port->flags & UPF_LOW_LATENCY) ? 1 : 0; 1526ab4382d2SGreg Kroah-Hartman tty->alt_speed = 0; 1527ab4382d2SGreg Kroah-Hartman tty_port_tty_set(port, tty); 1528ab4382d2SGreg Kroah-Hartman 1529ab4382d2SGreg Kroah-Hartman /* 1530ab4382d2SGreg Kroah-Hartman * If the port is in the middle of closing, bail out now. 1531ab4382d2SGreg Kroah-Hartman */ 1532ab4382d2SGreg Kroah-Hartman if (tty_hung_up_p(filp)) { 1533ab4382d2SGreg Kroah-Hartman retval = -EAGAIN; 1534ab4382d2SGreg Kroah-Hartman port->count--; 1535ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1536ab4382d2SGreg Kroah-Hartman goto fail; 1537ab4382d2SGreg Kroah-Hartman } 1538ab4382d2SGreg Kroah-Hartman 1539ab4382d2SGreg Kroah-Hartman /* 1540ab4382d2SGreg Kroah-Hartman * Make sure the device is in D0 state. 1541ab4382d2SGreg Kroah-Hartman */ 1542ab4382d2SGreg Kroah-Hartman if (port->count == 1) 1543ab4382d2SGreg Kroah-Hartman uart_change_pm(state, 0); 1544ab4382d2SGreg Kroah-Hartman 1545ab4382d2SGreg Kroah-Hartman /* 1546ab4382d2SGreg Kroah-Hartman * Start up the serial port. 1547ab4382d2SGreg Kroah-Hartman */ 1548ab4382d2SGreg Kroah-Hartman retval = uart_startup(tty, state, 0); 1549ab4382d2SGreg Kroah-Hartman 1550ab4382d2SGreg Kroah-Hartman /* 1551ab4382d2SGreg Kroah-Hartman * If we succeeded, wait until the port is ready. 1552ab4382d2SGreg Kroah-Hartman */ 1553ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1554ab4382d2SGreg Kroah-Hartman if (retval == 0) 1555ab4382d2SGreg Kroah-Hartman retval = tty_port_block_til_ready(port, tty, filp); 1556ab4382d2SGreg Kroah-Hartman 1557ab4382d2SGreg Kroah-Hartman fail: 1558ab4382d2SGreg Kroah-Hartman return retval; 1559ab4382d2SGreg Kroah-Hartman } 1560ab4382d2SGreg Kroah-Hartman 1561ab4382d2SGreg Kroah-Hartman static const char *uart_type(struct uart_port *port) 1562ab4382d2SGreg Kroah-Hartman { 1563ab4382d2SGreg Kroah-Hartman const char *str = NULL; 1564ab4382d2SGreg Kroah-Hartman 1565ab4382d2SGreg Kroah-Hartman if (port->ops->type) 1566ab4382d2SGreg Kroah-Hartman str = port->ops->type(port); 1567ab4382d2SGreg Kroah-Hartman 1568ab4382d2SGreg Kroah-Hartman if (!str) 1569ab4382d2SGreg Kroah-Hartman str = "unknown"; 1570ab4382d2SGreg Kroah-Hartman 1571ab4382d2SGreg Kroah-Hartman return str; 1572ab4382d2SGreg Kroah-Hartman } 1573ab4382d2SGreg Kroah-Hartman 1574ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_PROC_FS 1575ab4382d2SGreg Kroah-Hartman 1576ab4382d2SGreg Kroah-Hartman static void uart_line_info(struct seq_file *m, struct uart_driver *drv, int i) 1577ab4382d2SGreg Kroah-Hartman { 1578ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + i; 1579ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1580ab4382d2SGreg Kroah-Hartman int pm_state; 1581ab4382d2SGreg Kroah-Hartman struct uart_port *uport = state->uart_port; 1582ab4382d2SGreg Kroah-Hartman char stat_buf[32]; 1583ab4382d2SGreg Kroah-Hartman unsigned int status; 1584ab4382d2SGreg Kroah-Hartman int mmio; 1585ab4382d2SGreg Kroah-Hartman 1586ab4382d2SGreg Kroah-Hartman if (!uport) 1587ab4382d2SGreg Kroah-Hartman return; 1588ab4382d2SGreg Kroah-Hartman 1589ab4382d2SGreg Kroah-Hartman mmio = uport->iotype >= UPIO_MEM; 1590ab4382d2SGreg Kroah-Hartman seq_printf(m, "%d: uart:%s %s%08llX irq:%d", 1591ab4382d2SGreg Kroah-Hartman uport->line, uart_type(uport), 1592ab4382d2SGreg Kroah-Hartman mmio ? "mmio:0x" : "port:", 1593ab4382d2SGreg Kroah-Hartman mmio ? (unsigned long long)uport->mapbase 1594ab4382d2SGreg Kroah-Hartman : (unsigned long long)uport->iobase, 1595ab4382d2SGreg Kroah-Hartman uport->irq); 1596ab4382d2SGreg Kroah-Hartman 1597ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) { 1598ab4382d2SGreg Kroah-Hartman seq_putc(m, '\n'); 1599ab4382d2SGreg Kroah-Hartman return; 1600ab4382d2SGreg Kroah-Hartman } 1601ab4382d2SGreg Kroah-Hartman 1602ab4382d2SGreg Kroah-Hartman if (capable(CAP_SYS_ADMIN)) { 1603ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1604ab4382d2SGreg Kroah-Hartman pm_state = state->pm_state; 1605ab4382d2SGreg Kroah-Hartman if (pm_state) 1606ab4382d2SGreg Kroah-Hartman uart_change_pm(state, 0); 1607ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1608ab4382d2SGreg Kroah-Hartman status = uport->ops->get_mctrl(uport); 1609ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1610ab4382d2SGreg Kroah-Hartman if (pm_state) 1611ab4382d2SGreg Kroah-Hartman uart_change_pm(state, pm_state); 1612ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1613ab4382d2SGreg Kroah-Hartman 1614ab4382d2SGreg Kroah-Hartman seq_printf(m, " tx:%d rx:%d", 1615ab4382d2SGreg Kroah-Hartman uport->icount.tx, uport->icount.rx); 1616ab4382d2SGreg Kroah-Hartman if (uport->icount.frame) 1617ab4382d2SGreg Kroah-Hartman seq_printf(m, " fe:%d", 1618ab4382d2SGreg Kroah-Hartman uport->icount.frame); 1619ab4382d2SGreg Kroah-Hartman if (uport->icount.parity) 1620ab4382d2SGreg Kroah-Hartman seq_printf(m, " pe:%d", 1621ab4382d2SGreg Kroah-Hartman uport->icount.parity); 1622ab4382d2SGreg Kroah-Hartman if (uport->icount.brk) 1623ab4382d2SGreg Kroah-Hartman seq_printf(m, " brk:%d", 1624ab4382d2SGreg Kroah-Hartman uport->icount.brk); 1625ab4382d2SGreg Kroah-Hartman if (uport->icount.overrun) 1626ab4382d2SGreg Kroah-Hartman seq_printf(m, " oe:%d", 1627ab4382d2SGreg Kroah-Hartman uport->icount.overrun); 1628ab4382d2SGreg Kroah-Hartman 1629ab4382d2SGreg Kroah-Hartman #define INFOBIT(bit, str) \ 1630ab4382d2SGreg Kroah-Hartman if (uport->mctrl & (bit)) \ 1631ab4382d2SGreg Kroah-Hartman strncat(stat_buf, (str), sizeof(stat_buf) - \ 1632ab4382d2SGreg Kroah-Hartman strlen(stat_buf) - 2) 1633ab4382d2SGreg Kroah-Hartman #define STATBIT(bit, str) \ 1634ab4382d2SGreg Kroah-Hartman if (status & (bit)) \ 1635ab4382d2SGreg Kroah-Hartman strncat(stat_buf, (str), sizeof(stat_buf) - \ 1636ab4382d2SGreg Kroah-Hartman strlen(stat_buf) - 2) 1637ab4382d2SGreg Kroah-Hartman 1638ab4382d2SGreg Kroah-Hartman stat_buf[0] = '\0'; 1639ab4382d2SGreg Kroah-Hartman stat_buf[1] = '\0'; 1640ab4382d2SGreg Kroah-Hartman INFOBIT(TIOCM_RTS, "|RTS"); 1641ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_CTS, "|CTS"); 1642ab4382d2SGreg Kroah-Hartman INFOBIT(TIOCM_DTR, "|DTR"); 1643ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_DSR, "|DSR"); 1644ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_CAR, "|CD"); 1645ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_RNG, "|RI"); 1646ab4382d2SGreg Kroah-Hartman if (stat_buf[0]) 1647ab4382d2SGreg Kroah-Hartman stat_buf[0] = ' '; 1648ab4382d2SGreg Kroah-Hartman 1649ab4382d2SGreg Kroah-Hartman seq_puts(m, stat_buf); 1650ab4382d2SGreg Kroah-Hartman } 1651ab4382d2SGreg Kroah-Hartman seq_putc(m, '\n'); 1652ab4382d2SGreg Kroah-Hartman #undef STATBIT 1653ab4382d2SGreg Kroah-Hartman #undef INFOBIT 1654ab4382d2SGreg Kroah-Hartman } 1655ab4382d2SGreg Kroah-Hartman 1656ab4382d2SGreg Kroah-Hartman static int uart_proc_show(struct seq_file *m, void *v) 1657ab4382d2SGreg Kroah-Hartman { 1658ab4382d2SGreg Kroah-Hartman struct tty_driver *ttydrv = m->private; 1659ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = ttydrv->driver_state; 1660ab4382d2SGreg Kroah-Hartman int i; 1661ab4382d2SGreg Kroah-Hartman 1662ab4382d2SGreg Kroah-Hartman seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n", 1663ab4382d2SGreg Kroah-Hartman "", "", ""); 1664ab4382d2SGreg Kroah-Hartman for (i = 0; i < drv->nr; i++) 1665ab4382d2SGreg Kroah-Hartman uart_line_info(m, drv, i); 1666ab4382d2SGreg Kroah-Hartman return 0; 1667ab4382d2SGreg Kroah-Hartman } 1668ab4382d2SGreg Kroah-Hartman 1669ab4382d2SGreg Kroah-Hartman static int uart_proc_open(struct inode *inode, struct file *file) 1670ab4382d2SGreg Kroah-Hartman { 1671ab4382d2SGreg Kroah-Hartman return single_open(file, uart_proc_show, PDE(inode)->data); 1672ab4382d2SGreg Kroah-Hartman } 1673ab4382d2SGreg Kroah-Hartman 1674ab4382d2SGreg Kroah-Hartman static const struct file_operations uart_proc_fops = { 1675ab4382d2SGreg Kroah-Hartman .owner = THIS_MODULE, 1676ab4382d2SGreg Kroah-Hartman .open = uart_proc_open, 1677ab4382d2SGreg Kroah-Hartman .read = seq_read, 1678ab4382d2SGreg Kroah-Hartman .llseek = seq_lseek, 1679ab4382d2SGreg Kroah-Hartman .release = single_release, 1680ab4382d2SGreg Kroah-Hartman }; 1681ab4382d2SGreg Kroah-Hartman #endif 1682ab4382d2SGreg Kroah-Hartman 1683ab4382d2SGreg Kroah-Hartman #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL) 1684ab4382d2SGreg Kroah-Hartman /* 1685ab4382d2SGreg Kroah-Hartman * uart_console_write - write a console message to a serial port 1686ab4382d2SGreg Kroah-Hartman * @port: the port to write the message 1687ab4382d2SGreg Kroah-Hartman * @s: array of characters 1688ab4382d2SGreg Kroah-Hartman * @count: number of characters in string to write 1689ab4382d2SGreg Kroah-Hartman * @write: function to write character to port 1690ab4382d2SGreg Kroah-Hartman */ 1691ab4382d2SGreg Kroah-Hartman void uart_console_write(struct uart_port *port, const char *s, 1692ab4382d2SGreg Kroah-Hartman unsigned int count, 1693ab4382d2SGreg Kroah-Hartman void (*putchar)(struct uart_port *, int)) 1694ab4382d2SGreg Kroah-Hartman { 1695ab4382d2SGreg Kroah-Hartman unsigned int i; 1696ab4382d2SGreg Kroah-Hartman 1697ab4382d2SGreg Kroah-Hartman for (i = 0; i < count; i++, s++) { 1698ab4382d2SGreg Kroah-Hartman if (*s == '\n') 1699ab4382d2SGreg Kroah-Hartman putchar(port, '\r'); 1700ab4382d2SGreg Kroah-Hartman putchar(port, *s); 1701ab4382d2SGreg Kroah-Hartman } 1702ab4382d2SGreg Kroah-Hartman } 1703ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_console_write); 1704ab4382d2SGreg Kroah-Hartman 1705ab4382d2SGreg Kroah-Hartman /* 1706ab4382d2SGreg Kroah-Hartman * Check whether an invalid uart number has been specified, and 1707ab4382d2SGreg Kroah-Hartman * if so, search for the first available port that does have 1708ab4382d2SGreg Kroah-Hartman * console support. 1709ab4382d2SGreg Kroah-Hartman */ 1710ab4382d2SGreg Kroah-Hartman struct uart_port * __init 1711ab4382d2SGreg Kroah-Hartman uart_get_console(struct uart_port *ports, int nr, struct console *co) 1712ab4382d2SGreg Kroah-Hartman { 1713ab4382d2SGreg Kroah-Hartman int idx = co->index; 1714ab4382d2SGreg Kroah-Hartman 1715ab4382d2SGreg Kroah-Hartman if (idx < 0 || idx >= nr || (ports[idx].iobase == 0 && 1716ab4382d2SGreg Kroah-Hartman ports[idx].membase == NULL)) 1717ab4382d2SGreg Kroah-Hartman for (idx = 0; idx < nr; idx++) 1718ab4382d2SGreg Kroah-Hartman if (ports[idx].iobase != 0 || 1719ab4382d2SGreg Kroah-Hartman ports[idx].membase != NULL) 1720ab4382d2SGreg Kroah-Hartman break; 1721ab4382d2SGreg Kroah-Hartman 1722ab4382d2SGreg Kroah-Hartman co->index = idx; 1723ab4382d2SGreg Kroah-Hartman 1724ab4382d2SGreg Kroah-Hartman return ports + idx; 1725ab4382d2SGreg Kroah-Hartman } 1726ab4382d2SGreg Kroah-Hartman 1727ab4382d2SGreg Kroah-Hartman /** 1728ab4382d2SGreg Kroah-Hartman * uart_parse_options - Parse serial port baud/parity/bits/flow contro. 1729ab4382d2SGreg Kroah-Hartman * @options: pointer to option string 1730ab4382d2SGreg Kroah-Hartman * @baud: pointer to an 'int' variable for the baud rate. 1731ab4382d2SGreg Kroah-Hartman * @parity: pointer to an 'int' variable for the parity. 1732ab4382d2SGreg Kroah-Hartman * @bits: pointer to an 'int' variable for the number of data bits. 1733ab4382d2SGreg Kroah-Hartman * @flow: pointer to an 'int' variable for the flow control character. 1734ab4382d2SGreg Kroah-Hartman * 1735ab4382d2SGreg Kroah-Hartman * uart_parse_options decodes a string containing the serial console 1736ab4382d2SGreg Kroah-Hartman * options. The format of the string is <baud><parity><bits><flow>, 1737ab4382d2SGreg Kroah-Hartman * eg: 115200n8r 1738ab4382d2SGreg Kroah-Hartman */ 1739ab4382d2SGreg Kroah-Hartman void 1740ab4382d2SGreg Kroah-Hartman uart_parse_options(char *options, int *baud, int *parity, int *bits, int *flow) 1741ab4382d2SGreg Kroah-Hartman { 1742ab4382d2SGreg Kroah-Hartman char *s = options; 1743ab4382d2SGreg Kroah-Hartman 1744ab4382d2SGreg Kroah-Hartman *baud = simple_strtoul(s, NULL, 10); 1745ab4382d2SGreg Kroah-Hartman while (*s >= '0' && *s <= '9') 1746ab4382d2SGreg Kroah-Hartman s++; 1747ab4382d2SGreg Kroah-Hartman if (*s) 1748ab4382d2SGreg Kroah-Hartman *parity = *s++; 1749ab4382d2SGreg Kroah-Hartman if (*s) 1750ab4382d2SGreg Kroah-Hartman *bits = *s++ - '0'; 1751ab4382d2SGreg Kroah-Hartman if (*s) 1752ab4382d2SGreg Kroah-Hartman *flow = *s; 1753ab4382d2SGreg Kroah-Hartman } 1754ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_parse_options); 1755ab4382d2SGreg Kroah-Hartman 1756ab4382d2SGreg Kroah-Hartman struct baud_rates { 1757ab4382d2SGreg Kroah-Hartman unsigned int rate; 1758ab4382d2SGreg Kroah-Hartman unsigned int cflag; 1759ab4382d2SGreg Kroah-Hartman }; 1760ab4382d2SGreg Kroah-Hartman 1761ab4382d2SGreg Kroah-Hartman static const struct baud_rates baud_rates[] = { 1762ab4382d2SGreg Kroah-Hartman { 921600, B921600 }, 1763ab4382d2SGreg Kroah-Hartman { 460800, B460800 }, 1764ab4382d2SGreg Kroah-Hartman { 230400, B230400 }, 1765ab4382d2SGreg Kroah-Hartman { 115200, B115200 }, 1766ab4382d2SGreg Kroah-Hartman { 57600, B57600 }, 1767ab4382d2SGreg Kroah-Hartman { 38400, B38400 }, 1768ab4382d2SGreg Kroah-Hartman { 19200, B19200 }, 1769ab4382d2SGreg Kroah-Hartman { 9600, B9600 }, 1770ab4382d2SGreg Kroah-Hartman { 4800, B4800 }, 1771ab4382d2SGreg Kroah-Hartman { 2400, B2400 }, 1772ab4382d2SGreg Kroah-Hartman { 1200, B1200 }, 1773ab4382d2SGreg Kroah-Hartman { 0, B38400 } 1774ab4382d2SGreg Kroah-Hartman }; 1775ab4382d2SGreg Kroah-Hartman 1776ab4382d2SGreg Kroah-Hartman /** 1777ab4382d2SGreg Kroah-Hartman * uart_set_options - setup the serial console parameters 1778ab4382d2SGreg Kroah-Hartman * @port: pointer to the serial ports uart_port structure 1779ab4382d2SGreg Kroah-Hartman * @co: console pointer 1780ab4382d2SGreg Kroah-Hartman * @baud: baud rate 1781ab4382d2SGreg Kroah-Hartman * @parity: parity character - 'n' (none), 'o' (odd), 'e' (even) 1782ab4382d2SGreg Kroah-Hartman * @bits: number of data bits 1783ab4382d2SGreg Kroah-Hartman * @flow: flow control character - 'r' (rts) 1784ab4382d2SGreg Kroah-Hartman */ 1785ab4382d2SGreg Kroah-Hartman int 1786ab4382d2SGreg Kroah-Hartman uart_set_options(struct uart_port *port, struct console *co, 1787ab4382d2SGreg Kroah-Hartman int baud, int parity, int bits, int flow) 1788ab4382d2SGreg Kroah-Hartman { 1789ab4382d2SGreg Kroah-Hartman struct ktermios termios; 1790ab4382d2SGreg Kroah-Hartman static struct ktermios dummy; 1791ab4382d2SGreg Kroah-Hartman int i; 1792ab4382d2SGreg Kroah-Hartman 1793ab4382d2SGreg Kroah-Hartman /* 1794ab4382d2SGreg Kroah-Hartman * Ensure that the serial console lock is initialised 1795ab4382d2SGreg Kroah-Hartman * early. 1796ab4382d2SGreg Kroah-Hartman */ 1797ab4382d2SGreg Kroah-Hartman spin_lock_init(&port->lock); 1798ab4382d2SGreg Kroah-Hartman lockdep_set_class(&port->lock, &port_lock_key); 1799ab4382d2SGreg Kroah-Hartman 1800ab4382d2SGreg Kroah-Hartman memset(&termios, 0, sizeof(struct ktermios)); 1801ab4382d2SGreg Kroah-Hartman 1802ab4382d2SGreg Kroah-Hartman termios.c_cflag = CREAD | HUPCL | CLOCAL; 1803ab4382d2SGreg Kroah-Hartman 1804ab4382d2SGreg Kroah-Hartman /* 1805ab4382d2SGreg Kroah-Hartman * Construct a cflag setting. 1806ab4382d2SGreg Kroah-Hartman */ 1807ab4382d2SGreg Kroah-Hartman for (i = 0; baud_rates[i].rate; i++) 1808ab4382d2SGreg Kroah-Hartman if (baud_rates[i].rate <= baud) 1809ab4382d2SGreg Kroah-Hartman break; 1810ab4382d2SGreg Kroah-Hartman 1811ab4382d2SGreg Kroah-Hartman termios.c_cflag |= baud_rates[i].cflag; 1812ab4382d2SGreg Kroah-Hartman 1813ab4382d2SGreg Kroah-Hartman if (bits == 7) 1814ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CS7; 1815ab4382d2SGreg Kroah-Hartman else 1816ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CS8; 1817ab4382d2SGreg Kroah-Hartman 1818ab4382d2SGreg Kroah-Hartman switch (parity) { 1819ab4382d2SGreg Kroah-Hartman case 'o': case 'O': 1820ab4382d2SGreg Kroah-Hartman termios.c_cflag |= PARODD; 1821ab4382d2SGreg Kroah-Hartman /*fall through*/ 1822ab4382d2SGreg Kroah-Hartman case 'e': case 'E': 1823ab4382d2SGreg Kroah-Hartman termios.c_cflag |= PARENB; 1824ab4382d2SGreg Kroah-Hartman break; 1825ab4382d2SGreg Kroah-Hartman } 1826ab4382d2SGreg Kroah-Hartman 1827ab4382d2SGreg Kroah-Hartman if (flow == 'r') 1828ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CRTSCTS; 1829ab4382d2SGreg Kroah-Hartman 1830ab4382d2SGreg Kroah-Hartman /* 1831ab4382d2SGreg Kroah-Hartman * some uarts on other side don't support no flow control. 1832ab4382d2SGreg Kroah-Hartman * So we set * DTR in host uart to make them happy 1833ab4382d2SGreg Kroah-Hartman */ 1834ab4382d2SGreg Kroah-Hartman port->mctrl |= TIOCM_DTR; 1835ab4382d2SGreg Kroah-Hartman 1836ab4382d2SGreg Kroah-Hartman port->ops->set_termios(port, &termios, &dummy); 1837ab4382d2SGreg Kroah-Hartman /* 1838ab4382d2SGreg Kroah-Hartman * Allow the setting of the UART parameters with a NULL console 1839ab4382d2SGreg Kroah-Hartman * too: 1840ab4382d2SGreg Kroah-Hartman */ 1841ab4382d2SGreg Kroah-Hartman if (co) 1842ab4382d2SGreg Kroah-Hartman co->cflag = termios.c_cflag; 1843ab4382d2SGreg Kroah-Hartman 1844ab4382d2SGreg Kroah-Hartman return 0; 1845ab4382d2SGreg Kroah-Hartman } 1846ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_set_options); 1847ab4382d2SGreg Kroah-Hartman #endif /* CONFIG_SERIAL_CORE_CONSOLE */ 1848ab4382d2SGreg Kroah-Hartman 1849ab4382d2SGreg Kroah-Hartman static void uart_change_pm(struct uart_state *state, int pm_state) 1850ab4382d2SGreg Kroah-Hartman { 1851ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 1852ab4382d2SGreg Kroah-Hartman 1853ab4382d2SGreg Kroah-Hartman if (state->pm_state != pm_state) { 1854ab4382d2SGreg Kroah-Hartman if (port->ops->pm) 1855ab4382d2SGreg Kroah-Hartman port->ops->pm(port, pm_state, state->pm_state); 1856ab4382d2SGreg Kroah-Hartman state->pm_state = pm_state; 1857ab4382d2SGreg Kroah-Hartman } 1858ab4382d2SGreg Kroah-Hartman } 1859ab4382d2SGreg Kroah-Hartman 1860ab4382d2SGreg Kroah-Hartman struct uart_match { 1861ab4382d2SGreg Kroah-Hartman struct uart_port *port; 1862ab4382d2SGreg Kroah-Hartman struct uart_driver *driver; 1863ab4382d2SGreg Kroah-Hartman }; 1864ab4382d2SGreg Kroah-Hartman 1865ab4382d2SGreg Kroah-Hartman static int serial_match_port(struct device *dev, void *data) 1866ab4382d2SGreg Kroah-Hartman { 1867ab4382d2SGreg Kroah-Hartman struct uart_match *match = data; 1868ab4382d2SGreg Kroah-Hartman struct tty_driver *tty_drv = match->driver->tty_driver; 1869ab4382d2SGreg Kroah-Hartman dev_t devt = MKDEV(tty_drv->major, tty_drv->minor_start) + 1870ab4382d2SGreg Kroah-Hartman match->port->line; 1871ab4382d2SGreg Kroah-Hartman 1872ab4382d2SGreg Kroah-Hartman return dev->devt == devt; /* Actually, only one tty per port */ 1873ab4382d2SGreg Kroah-Hartman } 1874ab4382d2SGreg Kroah-Hartman 1875ab4382d2SGreg Kroah-Hartman int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport) 1876ab4382d2SGreg Kroah-Hartman { 1877ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 1878ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1879ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 1880ab4382d2SGreg Kroah-Hartman struct uart_match match = {uport, drv}; 1881ab4382d2SGreg Kroah-Hartman 1882ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1883ab4382d2SGreg Kroah-Hartman 1884ab4382d2SGreg Kroah-Hartman tty_dev = device_find_child(uport->dev, &match, serial_match_port); 1885ab4382d2SGreg Kroah-Hartman if (device_may_wakeup(tty_dev)) { 1886ab4382d2SGreg Kroah-Hartman if (!enable_irq_wake(uport->irq)) 1887ab4382d2SGreg Kroah-Hartman uport->irq_wake = 1; 1888ab4382d2SGreg Kroah-Hartman put_device(tty_dev); 1889ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1890ab4382d2SGreg Kroah-Hartman return 0; 1891ab4382d2SGreg Kroah-Hartman } 1892ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) 1893ab4382d2SGreg Kroah-Hartman uport->suspended = 1; 1894ab4382d2SGreg Kroah-Hartman 1895ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_INITIALIZED) { 1896ab4382d2SGreg Kroah-Hartman const struct uart_ops *ops = uport->ops; 1897ab4382d2SGreg Kroah-Hartman int tries; 1898ab4382d2SGreg Kroah-Hartman 1899ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) { 1900ab4382d2SGreg Kroah-Hartman set_bit(ASYNCB_SUSPENDED, &port->flags); 1901ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_INITIALIZED, &port->flags); 1902ab4382d2SGreg Kroah-Hartman 1903ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1904ab4382d2SGreg Kroah-Hartman ops->stop_tx(uport); 1905ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, 0); 1906ab4382d2SGreg Kroah-Hartman ops->stop_rx(uport); 1907ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1908ab4382d2SGreg Kroah-Hartman } 1909ab4382d2SGreg Kroah-Hartman 1910ab4382d2SGreg Kroah-Hartman /* 1911ab4382d2SGreg Kroah-Hartman * Wait for the transmitter to empty. 1912ab4382d2SGreg Kroah-Hartman */ 1913ab4382d2SGreg Kroah-Hartman for (tries = 3; !ops->tx_empty(uport) && tries; tries--) 1914ab4382d2SGreg Kroah-Hartman msleep(10); 1915ab4382d2SGreg Kroah-Hartman if (!tries) 1916ab4382d2SGreg Kroah-Hartman printk(KERN_ERR "%s%s%s%d: Unable to drain " 1917ab4382d2SGreg Kroah-Hartman "transmitter\n", 1918ab4382d2SGreg Kroah-Hartman uport->dev ? dev_name(uport->dev) : "", 1919ab4382d2SGreg Kroah-Hartman uport->dev ? ": " : "", 1920ab4382d2SGreg Kroah-Hartman drv->dev_name, 1921ab4382d2SGreg Kroah-Hartman drv->tty_driver->name_base + uport->line); 1922ab4382d2SGreg Kroah-Hartman 1923ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) 1924ab4382d2SGreg Kroah-Hartman ops->shutdown(uport); 1925ab4382d2SGreg Kroah-Hartman } 1926ab4382d2SGreg Kroah-Hartman 1927ab4382d2SGreg Kroah-Hartman /* 1928ab4382d2SGreg Kroah-Hartman * Disable the console device before suspending. 1929ab4382d2SGreg Kroah-Hartman */ 1930ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled && uart_console(uport)) 1931ab4382d2SGreg Kroah-Hartman console_stop(uport->cons); 1932ab4382d2SGreg Kroah-Hartman 1933ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) 1934ab4382d2SGreg Kroah-Hartman uart_change_pm(state, 3); 1935ab4382d2SGreg Kroah-Hartman 1936ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1937ab4382d2SGreg Kroah-Hartman 1938ab4382d2SGreg Kroah-Hartman return 0; 1939ab4382d2SGreg Kroah-Hartman } 1940ab4382d2SGreg Kroah-Hartman 1941ab4382d2SGreg Kroah-Hartman int uart_resume_port(struct uart_driver *drv, struct uart_port *uport) 1942ab4382d2SGreg Kroah-Hartman { 1943ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 1944ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1945ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 1946ab4382d2SGreg Kroah-Hartman struct uart_match match = {uport, drv}; 1947ab4382d2SGreg Kroah-Hartman struct ktermios termios; 1948ab4382d2SGreg Kroah-Hartman 1949ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1950ab4382d2SGreg Kroah-Hartman 1951ab4382d2SGreg Kroah-Hartman tty_dev = device_find_child(uport->dev, &match, serial_match_port); 1952ab4382d2SGreg Kroah-Hartman if (!uport->suspended && device_may_wakeup(tty_dev)) { 1953ab4382d2SGreg Kroah-Hartman if (uport->irq_wake) { 1954ab4382d2SGreg Kroah-Hartman disable_irq_wake(uport->irq); 1955ab4382d2SGreg Kroah-Hartman uport->irq_wake = 0; 1956ab4382d2SGreg Kroah-Hartman } 1957ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1958ab4382d2SGreg Kroah-Hartman return 0; 1959ab4382d2SGreg Kroah-Hartman } 1960ab4382d2SGreg Kroah-Hartman uport->suspended = 0; 1961ab4382d2SGreg Kroah-Hartman 1962ab4382d2SGreg Kroah-Hartman /* 1963ab4382d2SGreg Kroah-Hartman * Re-enable the console device after suspending. 1964ab4382d2SGreg Kroah-Hartman */ 19655933a161SYin Kangkai if (uart_console(uport)) { 1966ab4382d2SGreg Kroah-Hartman /* 1967ab4382d2SGreg Kroah-Hartman * First try to use the console cflag setting. 1968ab4382d2SGreg Kroah-Hartman */ 1969ab4382d2SGreg Kroah-Hartman memset(&termios, 0, sizeof(struct ktermios)); 1970ab4382d2SGreg Kroah-Hartman termios.c_cflag = uport->cons->cflag; 1971ab4382d2SGreg Kroah-Hartman 1972ab4382d2SGreg Kroah-Hartman /* 1973ab4382d2SGreg Kroah-Hartman * If that's unset, use the tty termios setting. 1974ab4382d2SGreg Kroah-Hartman */ 1975ab4382d2SGreg Kroah-Hartman if (port->tty && port->tty->termios && termios.c_cflag == 0) 1976ab4382d2SGreg Kroah-Hartman termios = *(port->tty->termios); 1977ab4382d2SGreg Kroah-Hartman 1978ab4382d2SGreg Kroah-Hartman uport->ops->set_termios(uport, &termios, NULL); 19795933a161SYin Kangkai if (console_suspend_enabled) 1980ab4382d2SGreg Kroah-Hartman console_start(uport->cons); 1981ab4382d2SGreg Kroah-Hartman } 1982ab4382d2SGreg Kroah-Hartman 1983ab4382d2SGreg Kroah-Hartman if (port->flags & ASYNC_SUSPENDED) { 1984ab4382d2SGreg Kroah-Hartman const struct uart_ops *ops = uport->ops; 1985ab4382d2SGreg Kroah-Hartman int ret; 1986ab4382d2SGreg Kroah-Hartman 1987ab4382d2SGreg Kroah-Hartman uart_change_pm(state, 0); 1988ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1989ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, 0); 1990ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1991ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) { 1992ab4382d2SGreg Kroah-Hartman /* Protected by port mutex for now */ 1993ab4382d2SGreg Kroah-Hartman struct tty_struct *tty = port->tty; 1994ab4382d2SGreg Kroah-Hartman ret = ops->startup(uport); 1995ab4382d2SGreg Kroah-Hartman if (ret == 0) { 1996ab4382d2SGreg Kroah-Hartman if (tty) 1997ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 1998ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1999ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, uport->mctrl); 2000ab4382d2SGreg Kroah-Hartman ops->start_tx(uport); 2001ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2002ab4382d2SGreg Kroah-Hartman set_bit(ASYNCB_INITIALIZED, &port->flags); 2003ab4382d2SGreg Kroah-Hartman } else { 2004ab4382d2SGreg Kroah-Hartman /* 2005ab4382d2SGreg Kroah-Hartman * Failed to resume - maybe hardware went away? 2006ab4382d2SGreg Kroah-Hartman * Clear the "initialized" flag so we won't try 2007ab4382d2SGreg Kroah-Hartman * to call the low level drivers shutdown method. 2008ab4382d2SGreg Kroah-Hartman */ 2009ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 2010ab4382d2SGreg Kroah-Hartman } 2011ab4382d2SGreg Kroah-Hartman } 2012ab4382d2SGreg Kroah-Hartman 2013ab4382d2SGreg Kroah-Hartman clear_bit(ASYNCB_SUSPENDED, &port->flags); 2014ab4382d2SGreg Kroah-Hartman } 2015ab4382d2SGreg Kroah-Hartman 2016ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2017ab4382d2SGreg Kroah-Hartman 2018ab4382d2SGreg Kroah-Hartman return 0; 2019ab4382d2SGreg Kroah-Hartman } 2020ab4382d2SGreg Kroah-Hartman 2021ab4382d2SGreg Kroah-Hartman static inline void 2022ab4382d2SGreg Kroah-Hartman uart_report_port(struct uart_driver *drv, struct uart_port *port) 2023ab4382d2SGreg Kroah-Hartman { 2024ab4382d2SGreg Kroah-Hartman char address[64]; 2025ab4382d2SGreg Kroah-Hartman 2026ab4382d2SGreg Kroah-Hartman switch (port->iotype) { 2027ab4382d2SGreg Kroah-Hartman case UPIO_PORT: 2028ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), "I/O 0x%lx", port->iobase); 2029ab4382d2SGreg Kroah-Hartman break; 2030ab4382d2SGreg Kroah-Hartman case UPIO_HUB6: 2031ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), 2032ab4382d2SGreg Kroah-Hartman "I/O 0x%lx offset 0x%x", port->iobase, port->hub6); 2033ab4382d2SGreg Kroah-Hartman break; 2034ab4382d2SGreg Kroah-Hartman case UPIO_MEM: 2035ab4382d2SGreg Kroah-Hartman case UPIO_MEM32: 2036ab4382d2SGreg Kroah-Hartman case UPIO_AU: 2037ab4382d2SGreg Kroah-Hartman case UPIO_TSI: 2038ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), 2039ab4382d2SGreg Kroah-Hartman "MMIO 0x%llx", (unsigned long long)port->mapbase); 2040ab4382d2SGreg Kroah-Hartman break; 2041ab4382d2SGreg Kroah-Hartman default: 2042ab4382d2SGreg Kroah-Hartman strlcpy(address, "*unknown*", sizeof(address)); 2043ab4382d2SGreg Kroah-Hartman break; 2044ab4382d2SGreg Kroah-Hartman } 2045ab4382d2SGreg Kroah-Hartman 2046ab4382d2SGreg Kroah-Hartman printk(KERN_INFO "%s%s%s%d at %s (irq = %d) is a %s\n", 2047ab4382d2SGreg Kroah-Hartman port->dev ? dev_name(port->dev) : "", 2048ab4382d2SGreg Kroah-Hartman port->dev ? ": " : "", 2049ab4382d2SGreg Kroah-Hartman drv->dev_name, 2050ab4382d2SGreg Kroah-Hartman drv->tty_driver->name_base + port->line, 2051ab4382d2SGreg Kroah-Hartman address, port->irq, uart_type(port)); 2052ab4382d2SGreg Kroah-Hartman } 2053ab4382d2SGreg Kroah-Hartman 2054ab4382d2SGreg Kroah-Hartman static void 2055ab4382d2SGreg Kroah-Hartman uart_configure_port(struct uart_driver *drv, struct uart_state *state, 2056ab4382d2SGreg Kroah-Hartman struct uart_port *port) 2057ab4382d2SGreg Kroah-Hartman { 2058ab4382d2SGreg Kroah-Hartman unsigned int flags; 2059ab4382d2SGreg Kroah-Hartman 2060ab4382d2SGreg Kroah-Hartman /* 2061ab4382d2SGreg Kroah-Hartman * If there isn't a port here, don't do anything further. 2062ab4382d2SGreg Kroah-Hartman */ 2063ab4382d2SGreg Kroah-Hartman if (!port->iobase && !port->mapbase && !port->membase) 2064ab4382d2SGreg Kroah-Hartman return; 2065ab4382d2SGreg Kroah-Hartman 2066ab4382d2SGreg Kroah-Hartman /* 2067ab4382d2SGreg Kroah-Hartman * Now do the auto configuration stuff. Note that config_port 2068ab4382d2SGreg Kroah-Hartman * is expected to claim the resources and map the port for us. 2069ab4382d2SGreg Kroah-Hartman */ 2070ab4382d2SGreg Kroah-Hartman flags = 0; 2071ab4382d2SGreg Kroah-Hartman if (port->flags & UPF_AUTO_IRQ) 2072ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_IRQ; 2073ab4382d2SGreg Kroah-Hartman if (port->flags & UPF_BOOT_AUTOCONF) { 2074ab4382d2SGreg Kroah-Hartman if (!(port->flags & UPF_FIXED_TYPE)) { 2075ab4382d2SGreg Kroah-Hartman port->type = PORT_UNKNOWN; 2076ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_TYPE; 2077ab4382d2SGreg Kroah-Hartman } 2078ab4382d2SGreg Kroah-Hartman port->ops->config_port(port, flags); 2079ab4382d2SGreg Kroah-Hartman } 2080ab4382d2SGreg Kroah-Hartman 2081ab4382d2SGreg Kroah-Hartman if (port->type != PORT_UNKNOWN) { 2082ab4382d2SGreg Kroah-Hartman unsigned long flags; 2083ab4382d2SGreg Kroah-Hartman 2084ab4382d2SGreg Kroah-Hartman uart_report_port(drv, port); 2085ab4382d2SGreg Kroah-Hartman 2086ab4382d2SGreg Kroah-Hartman /* Power up port for set_mctrl() */ 2087ab4382d2SGreg Kroah-Hartman uart_change_pm(state, 0); 2088ab4382d2SGreg Kroah-Hartman 2089ab4382d2SGreg Kroah-Hartman /* 2090ab4382d2SGreg Kroah-Hartman * Ensure that the modem control lines are de-activated. 2091ab4382d2SGreg Kroah-Hartman * keep the DTR setting that is set in uart_set_options() 2092ab4382d2SGreg Kroah-Hartman * We probably don't need a spinlock around this, but 2093ab4382d2SGreg Kroah-Hartman */ 2094ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 2095ab4382d2SGreg Kroah-Hartman port->ops->set_mctrl(port, port->mctrl & TIOCM_DTR); 2096ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 2097ab4382d2SGreg Kroah-Hartman 2098ab4382d2SGreg Kroah-Hartman /* 2099ab4382d2SGreg Kroah-Hartman * If this driver supports console, and it hasn't been 2100ab4382d2SGreg Kroah-Hartman * successfully registered yet, try to re-register it. 2101ab4382d2SGreg Kroah-Hartman * It may be that the port was not available. 2102ab4382d2SGreg Kroah-Hartman */ 2103ab4382d2SGreg Kroah-Hartman if (port->cons && !(port->cons->flags & CON_ENABLED)) 2104ab4382d2SGreg Kroah-Hartman register_console(port->cons); 2105ab4382d2SGreg Kroah-Hartman 2106ab4382d2SGreg Kroah-Hartman /* 2107ab4382d2SGreg Kroah-Hartman * Power down all ports by default, except the 2108ab4382d2SGreg Kroah-Hartman * console if we have one. 2109ab4382d2SGreg Kroah-Hartman */ 2110ab4382d2SGreg Kroah-Hartman if (!uart_console(port)) 2111ab4382d2SGreg Kroah-Hartman uart_change_pm(state, 3); 2112ab4382d2SGreg Kroah-Hartman } 2113ab4382d2SGreg Kroah-Hartman } 2114ab4382d2SGreg Kroah-Hartman 2115ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 2116ab4382d2SGreg Kroah-Hartman 2117ab4382d2SGreg Kroah-Hartman static int uart_poll_init(struct tty_driver *driver, int line, char *options) 2118ab4382d2SGreg Kroah-Hartman { 2119ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2120ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2121ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2122ab4382d2SGreg Kroah-Hartman int baud = 9600; 2123ab4382d2SGreg Kroah-Hartman int bits = 8; 2124ab4382d2SGreg Kroah-Hartman int parity = 'n'; 2125ab4382d2SGreg Kroah-Hartman int flow = 'n'; 2126ab4382d2SGreg Kroah-Hartman 2127ab4382d2SGreg Kroah-Hartman if (!state || !state->uart_port) 2128ab4382d2SGreg Kroah-Hartman return -1; 2129ab4382d2SGreg Kroah-Hartman 2130ab4382d2SGreg Kroah-Hartman port = state->uart_port; 2131ab4382d2SGreg Kroah-Hartman if (!(port->ops->poll_get_char && port->ops->poll_put_char)) 2132ab4382d2SGreg Kroah-Hartman return -1; 2133ab4382d2SGreg Kroah-Hartman 2134ab4382d2SGreg Kroah-Hartman if (options) { 2135ab4382d2SGreg Kroah-Hartman uart_parse_options(options, &baud, &parity, &bits, &flow); 2136ab4382d2SGreg Kroah-Hartman return uart_set_options(port, NULL, baud, parity, bits, flow); 2137ab4382d2SGreg Kroah-Hartman } 2138ab4382d2SGreg Kroah-Hartman 2139ab4382d2SGreg Kroah-Hartman return 0; 2140ab4382d2SGreg Kroah-Hartman } 2141ab4382d2SGreg Kroah-Hartman 2142ab4382d2SGreg Kroah-Hartman static int uart_poll_get_char(struct tty_driver *driver, int line) 2143ab4382d2SGreg Kroah-Hartman { 2144ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2145ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2146ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2147ab4382d2SGreg Kroah-Hartman 2148ab4382d2SGreg Kroah-Hartman if (!state || !state->uart_port) 2149ab4382d2SGreg Kroah-Hartman return -1; 2150ab4382d2SGreg Kroah-Hartman 2151ab4382d2SGreg Kroah-Hartman port = state->uart_port; 2152ab4382d2SGreg Kroah-Hartman return port->ops->poll_get_char(port); 2153ab4382d2SGreg Kroah-Hartman } 2154ab4382d2SGreg Kroah-Hartman 2155ab4382d2SGreg Kroah-Hartman static void uart_poll_put_char(struct tty_driver *driver, int line, char ch) 2156ab4382d2SGreg Kroah-Hartman { 2157ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2158ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2159ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2160ab4382d2SGreg Kroah-Hartman 2161ab4382d2SGreg Kroah-Hartman if (!state || !state->uart_port) 2162ab4382d2SGreg Kroah-Hartman return; 2163ab4382d2SGreg Kroah-Hartman 2164ab4382d2SGreg Kroah-Hartman port = state->uart_port; 2165ab4382d2SGreg Kroah-Hartman port->ops->poll_put_char(port, ch); 2166ab4382d2SGreg Kroah-Hartman } 2167ab4382d2SGreg Kroah-Hartman #endif 2168ab4382d2SGreg Kroah-Hartman 2169ab4382d2SGreg Kroah-Hartman static const struct tty_operations uart_ops = { 2170ab4382d2SGreg Kroah-Hartman .open = uart_open, 2171ab4382d2SGreg Kroah-Hartman .close = uart_close, 2172ab4382d2SGreg Kroah-Hartman .write = uart_write, 2173ab4382d2SGreg Kroah-Hartman .put_char = uart_put_char, 2174ab4382d2SGreg Kroah-Hartman .flush_chars = uart_flush_chars, 2175ab4382d2SGreg Kroah-Hartman .write_room = uart_write_room, 2176ab4382d2SGreg Kroah-Hartman .chars_in_buffer= uart_chars_in_buffer, 2177ab4382d2SGreg Kroah-Hartman .flush_buffer = uart_flush_buffer, 2178ab4382d2SGreg Kroah-Hartman .ioctl = uart_ioctl, 2179ab4382d2SGreg Kroah-Hartman .throttle = uart_throttle, 2180ab4382d2SGreg Kroah-Hartman .unthrottle = uart_unthrottle, 2181ab4382d2SGreg Kroah-Hartman .send_xchar = uart_send_xchar, 2182ab4382d2SGreg Kroah-Hartman .set_termios = uart_set_termios, 2183ab4382d2SGreg Kroah-Hartman .set_ldisc = uart_set_ldisc, 2184ab4382d2SGreg Kroah-Hartman .stop = uart_stop, 2185ab4382d2SGreg Kroah-Hartman .start = uart_start, 2186ab4382d2SGreg Kroah-Hartman .hangup = uart_hangup, 2187ab4382d2SGreg Kroah-Hartman .break_ctl = uart_break_ctl, 2188ab4382d2SGreg Kroah-Hartman .wait_until_sent= uart_wait_until_sent, 2189ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_PROC_FS 2190ab4382d2SGreg Kroah-Hartman .proc_fops = &uart_proc_fops, 2191ab4382d2SGreg Kroah-Hartman #endif 2192ab4382d2SGreg Kroah-Hartman .tiocmget = uart_tiocmget, 2193ab4382d2SGreg Kroah-Hartman .tiocmset = uart_tiocmset, 2194ab4382d2SGreg Kroah-Hartman .get_icount = uart_get_icount, 2195ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 2196ab4382d2SGreg Kroah-Hartman .poll_init = uart_poll_init, 2197ab4382d2SGreg Kroah-Hartman .poll_get_char = uart_poll_get_char, 2198ab4382d2SGreg Kroah-Hartman .poll_put_char = uart_poll_put_char, 2199ab4382d2SGreg Kroah-Hartman #endif 2200ab4382d2SGreg Kroah-Hartman }; 2201ab4382d2SGreg Kroah-Hartman 2202ab4382d2SGreg Kroah-Hartman static const struct tty_port_operations uart_port_ops = { 2203ab4382d2SGreg Kroah-Hartman .carrier_raised = uart_carrier_raised, 2204ab4382d2SGreg Kroah-Hartman .dtr_rts = uart_dtr_rts, 2205ab4382d2SGreg Kroah-Hartman }; 2206ab4382d2SGreg Kroah-Hartman 2207ab4382d2SGreg Kroah-Hartman /** 2208ab4382d2SGreg Kroah-Hartman * uart_register_driver - register a driver with the uart core layer 2209ab4382d2SGreg Kroah-Hartman * @drv: low level driver structure 2210ab4382d2SGreg Kroah-Hartman * 2211ab4382d2SGreg Kroah-Hartman * Register a uart driver with the core driver. We in turn register 2212ab4382d2SGreg Kroah-Hartman * with the tty layer, and initialise the core driver per-port state. 2213ab4382d2SGreg Kroah-Hartman * 2214ab4382d2SGreg Kroah-Hartman * We have a proc file in /proc/tty/driver which is named after the 2215ab4382d2SGreg Kroah-Hartman * normal driver. 2216ab4382d2SGreg Kroah-Hartman * 2217ab4382d2SGreg Kroah-Hartman * drv->port should be NULL, and the per-port structures should be 2218ab4382d2SGreg Kroah-Hartman * registered using uart_add_one_port after this call has succeeded. 2219ab4382d2SGreg Kroah-Hartman */ 2220ab4382d2SGreg Kroah-Hartman int uart_register_driver(struct uart_driver *drv) 2221ab4382d2SGreg Kroah-Hartman { 2222ab4382d2SGreg Kroah-Hartman struct tty_driver *normal; 2223ab4382d2SGreg Kroah-Hartman int i, retval; 2224ab4382d2SGreg Kroah-Hartman 2225ab4382d2SGreg Kroah-Hartman BUG_ON(drv->state); 2226ab4382d2SGreg Kroah-Hartman 2227ab4382d2SGreg Kroah-Hartman /* 2228ab4382d2SGreg Kroah-Hartman * Maybe we should be using a slab cache for this, especially if 2229ab4382d2SGreg Kroah-Hartman * we have a large number of ports to handle. 2230ab4382d2SGreg Kroah-Hartman */ 2231ab4382d2SGreg Kroah-Hartman drv->state = kzalloc(sizeof(struct uart_state) * drv->nr, GFP_KERNEL); 2232ab4382d2SGreg Kroah-Hartman if (!drv->state) 2233ab4382d2SGreg Kroah-Hartman goto out; 2234ab4382d2SGreg Kroah-Hartman 2235ab4382d2SGreg Kroah-Hartman normal = alloc_tty_driver(drv->nr); 2236ab4382d2SGreg Kroah-Hartman if (!normal) 2237ab4382d2SGreg Kroah-Hartman goto out_kfree; 2238ab4382d2SGreg Kroah-Hartman 2239ab4382d2SGreg Kroah-Hartman drv->tty_driver = normal; 2240ab4382d2SGreg Kroah-Hartman 2241ab4382d2SGreg Kroah-Hartman normal->owner = drv->owner; 2242ab4382d2SGreg Kroah-Hartman normal->driver_name = drv->driver_name; 2243ab4382d2SGreg Kroah-Hartman normal->name = drv->dev_name; 2244ab4382d2SGreg Kroah-Hartman normal->major = drv->major; 2245ab4382d2SGreg Kroah-Hartman normal->minor_start = drv->minor; 2246ab4382d2SGreg Kroah-Hartman normal->type = TTY_DRIVER_TYPE_SERIAL; 2247ab4382d2SGreg Kroah-Hartman normal->subtype = SERIAL_TYPE_NORMAL; 2248ab4382d2SGreg Kroah-Hartman normal->init_termios = tty_std_termios; 2249ab4382d2SGreg Kroah-Hartman normal->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; 2250ab4382d2SGreg Kroah-Hartman normal->init_termios.c_ispeed = normal->init_termios.c_ospeed = 9600; 2251ab4382d2SGreg Kroah-Hartman normal->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; 2252ab4382d2SGreg Kroah-Hartman normal->driver_state = drv; 2253ab4382d2SGreg Kroah-Hartman tty_set_operations(normal, &uart_ops); 2254ab4382d2SGreg Kroah-Hartman 2255ab4382d2SGreg Kroah-Hartman /* 2256ab4382d2SGreg Kroah-Hartman * Initialise the UART state(s). 2257ab4382d2SGreg Kroah-Hartman */ 2258ab4382d2SGreg Kroah-Hartman for (i = 0; i < drv->nr; i++) { 2259ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + i; 2260ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2261ab4382d2SGreg Kroah-Hartman 2262ab4382d2SGreg Kroah-Hartman tty_port_init(port); 2263ab4382d2SGreg Kroah-Hartman port->ops = &uart_port_ops; 2264ab4382d2SGreg Kroah-Hartman port->close_delay = 500; /* .5 seconds */ 2265ab4382d2SGreg Kroah-Hartman port->closing_wait = 30000; /* 30 seconds */ 2266ab4382d2SGreg Kroah-Hartman } 2267ab4382d2SGreg Kroah-Hartman 2268ab4382d2SGreg Kroah-Hartman retval = tty_register_driver(normal); 2269ab4382d2SGreg Kroah-Hartman if (retval >= 0) 2270ab4382d2SGreg Kroah-Hartman return retval; 2271ab4382d2SGreg Kroah-Hartman 2272ab4382d2SGreg Kroah-Hartman put_tty_driver(normal); 2273ab4382d2SGreg Kroah-Hartman out_kfree: 2274ab4382d2SGreg Kroah-Hartman kfree(drv->state); 2275ab4382d2SGreg Kroah-Hartman out: 2276ab4382d2SGreg Kroah-Hartman return -ENOMEM; 2277ab4382d2SGreg Kroah-Hartman } 2278ab4382d2SGreg Kroah-Hartman 2279ab4382d2SGreg Kroah-Hartman /** 2280ab4382d2SGreg Kroah-Hartman * uart_unregister_driver - remove a driver from the uart core layer 2281ab4382d2SGreg Kroah-Hartman * @drv: low level driver structure 2282ab4382d2SGreg Kroah-Hartman * 2283ab4382d2SGreg Kroah-Hartman * Remove all references to a driver from the core driver. The low 2284ab4382d2SGreg Kroah-Hartman * level driver must have removed all its ports via the 2285ab4382d2SGreg Kroah-Hartman * uart_remove_one_port() if it registered them with uart_add_one_port(). 2286ab4382d2SGreg Kroah-Hartman * (ie, drv->port == NULL) 2287ab4382d2SGreg Kroah-Hartman */ 2288ab4382d2SGreg Kroah-Hartman void uart_unregister_driver(struct uart_driver *drv) 2289ab4382d2SGreg Kroah-Hartman { 2290ab4382d2SGreg Kroah-Hartman struct tty_driver *p = drv->tty_driver; 2291ab4382d2SGreg Kroah-Hartman tty_unregister_driver(p); 2292ab4382d2SGreg Kroah-Hartman put_tty_driver(p); 2293ab4382d2SGreg Kroah-Hartman kfree(drv->state); 2294ab4382d2SGreg Kroah-Hartman drv->tty_driver = NULL; 2295ab4382d2SGreg Kroah-Hartman } 2296ab4382d2SGreg Kroah-Hartman 2297ab4382d2SGreg Kroah-Hartman struct tty_driver *uart_console_device(struct console *co, int *index) 2298ab4382d2SGreg Kroah-Hartman { 2299ab4382d2SGreg Kroah-Hartman struct uart_driver *p = co->data; 2300ab4382d2SGreg Kroah-Hartman *index = co->index; 2301ab4382d2SGreg Kroah-Hartman return p->tty_driver; 2302ab4382d2SGreg Kroah-Hartman } 2303ab4382d2SGreg Kroah-Hartman 2304ab4382d2SGreg Kroah-Hartman /** 2305ab4382d2SGreg Kroah-Hartman * uart_add_one_port - attach a driver-defined port structure 2306ab4382d2SGreg Kroah-Hartman * @drv: pointer to the uart low level driver structure for this port 2307ab4382d2SGreg Kroah-Hartman * @uport: uart port structure to use for this port. 2308ab4382d2SGreg Kroah-Hartman * 2309ab4382d2SGreg Kroah-Hartman * This allows the driver to register its own uart_port structure 2310ab4382d2SGreg Kroah-Hartman * with the core driver. The main purpose is to allow the low 2311ab4382d2SGreg Kroah-Hartman * level uart drivers to expand uart_port, rather than having yet 2312ab4382d2SGreg Kroah-Hartman * more levels of structures. 2313ab4382d2SGreg Kroah-Hartman */ 2314ab4382d2SGreg Kroah-Hartman int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport) 2315ab4382d2SGreg Kroah-Hartman { 2316ab4382d2SGreg Kroah-Hartman struct uart_state *state; 2317ab4382d2SGreg Kroah-Hartman struct tty_port *port; 2318ab4382d2SGreg Kroah-Hartman int ret = 0; 2319ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 2320ab4382d2SGreg Kroah-Hartman 2321ab4382d2SGreg Kroah-Hartman BUG_ON(in_interrupt()); 2322ab4382d2SGreg Kroah-Hartman 2323ab4382d2SGreg Kroah-Hartman if (uport->line >= drv->nr) 2324ab4382d2SGreg Kroah-Hartman return -EINVAL; 2325ab4382d2SGreg Kroah-Hartman 2326ab4382d2SGreg Kroah-Hartman state = drv->state + uport->line; 2327ab4382d2SGreg Kroah-Hartman port = &state->port; 2328ab4382d2SGreg Kroah-Hartman 2329ab4382d2SGreg Kroah-Hartman mutex_lock(&port_mutex); 2330ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2331ab4382d2SGreg Kroah-Hartman if (state->uart_port) { 2332ab4382d2SGreg Kroah-Hartman ret = -EINVAL; 2333ab4382d2SGreg Kroah-Hartman goto out; 2334ab4382d2SGreg Kroah-Hartman } 2335ab4382d2SGreg Kroah-Hartman 2336ab4382d2SGreg Kroah-Hartman state->uart_port = uport; 2337ab4382d2SGreg Kroah-Hartman state->pm_state = -1; 2338ab4382d2SGreg Kroah-Hartman 2339ab4382d2SGreg Kroah-Hartman uport->cons = drv->cons; 2340ab4382d2SGreg Kroah-Hartman uport->state = state; 2341ab4382d2SGreg Kroah-Hartman 2342ab4382d2SGreg Kroah-Hartman /* 2343ab4382d2SGreg Kroah-Hartman * If this port is a console, then the spinlock is already 2344ab4382d2SGreg Kroah-Hartman * initialised. 2345ab4382d2SGreg Kroah-Hartman */ 2346ab4382d2SGreg Kroah-Hartman if (!(uart_console(uport) && (uport->cons->flags & CON_ENABLED))) { 2347ab4382d2SGreg Kroah-Hartman spin_lock_init(&uport->lock); 2348ab4382d2SGreg Kroah-Hartman lockdep_set_class(&uport->lock, &port_lock_key); 2349ab4382d2SGreg Kroah-Hartman } 2350ab4382d2SGreg Kroah-Hartman 2351ab4382d2SGreg Kroah-Hartman uart_configure_port(drv, state, uport); 2352ab4382d2SGreg Kroah-Hartman 2353ab4382d2SGreg Kroah-Hartman /* 2354ab4382d2SGreg Kroah-Hartman * Register the port whether it's detected or not. This allows 2355ab4382d2SGreg Kroah-Hartman * setserial to be used to alter this ports parameters. 2356ab4382d2SGreg Kroah-Hartman */ 2357ab4382d2SGreg Kroah-Hartman tty_dev = tty_register_device(drv->tty_driver, uport->line, uport->dev); 2358ab4382d2SGreg Kroah-Hartman if (likely(!IS_ERR(tty_dev))) { 2359ab4382d2SGreg Kroah-Hartman device_init_wakeup(tty_dev, 1); 2360ab4382d2SGreg Kroah-Hartman device_set_wakeup_enable(tty_dev, 0); 2361ab4382d2SGreg Kroah-Hartman } else 2362ab4382d2SGreg Kroah-Hartman printk(KERN_ERR "Cannot register tty device on line %d\n", 2363ab4382d2SGreg Kroah-Hartman uport->line); 2364ab4382d2SGreg Kroah-Hartman 2365ab4382d2SGreg Kroah-Hartman /* 2366ab4382d2SGreg Kroah-Hartman * Ensure UPF_DEAD is not set. 2367ab4382d2SGreg Kroah-Hartman */ 2368ab4382d2SGreg Kroah-Hartman uport->flags &= ~UPF_DEAD; 2369ab4382d2SGreg Kroah-Hartman 2370ab4382d2SGreg Kroah-Hartman out: 2371ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2372ab4382d2SGreg Kroah-Hartman mutex_unlock(&port_mutex); 2373ab4382d2SGreg Kroah-Hartman 2374ab4382d2SGreg Kroah-Hartman return ret; 2375ab4382d2SGreg Kroah-Hartman } 2376ab4382d2SGreg Kroah-Hartman 2377ab4382d2SGreg Kroah-Hartman /** 2378ab4382d2SGreg Kroah-Hartman * uart_remove_one_port - detach a driver defined port structure 2379ab4382d2SGreg Kroah-Hartman * @drv: pointer to the uart low level driver structure for this port 2380ab4382d2SGreg Kroah-Hartman * @uport: uart port structure for this port 2381ab4382d2SGreg Kroah-Hartman * 2382ab4382d2SGreg Kroah-Hartman * This unhooks (and hangs up) the specified port structure from the 2383ab4382d2SGreg Kroah-Hartman * core driver. No further calls will be made to the low-level code 2384ab4382d2SGreg Kroah-Hartman * for this port. 2385ab4382d2SGreg Kroah-Hartman */ 2386ab4382d2SGreg Kroah-Hartman int uart_remove_one_port(struct uart_driver *drv, struct uart_port *uport) 2387ab4382d2SGreg Kroah-Hartman { 2388ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 2389ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2390ab4382d2SGreg Kroah-Hartman 2391ab4382d2SGreg Kroah-Hartman BUG_ON(in_interrupt()); 2392ab4382d2SGreg Kroah-Hartman 2393ab4382d2SGreg Kroah-Hartman if (state->uart_port != uport) 2394ab4382d2SGreg Kroah-Hartman printk(KERN_ALERT "Removing wrong port: %p != %p\n", 2395ab4382d2SGreg Kroah-Hartman state->uart_port, uport); 2396ab4382d2SGreg Kroah-Hartman 2397ab4382d2SGreg Kroah-Hartman mutex_lock(&port_mutex); 2398ab4382d2SGreg Kroah-Hartman 2399ab4382d2SGreg Kroah-Hartman /* 2400ab4382d2SGreg Kroah-Hartman * Mark the port "dead" - this prevents any opens from 2401ab4382d2SGreg Kroah-Hartman * succeeding while we shut down the port. 2402ab4382d2SGreg Kroah-Hartman */ 2403ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2404ab4382d2SGreg Kroah-Hartman uport->flags |= UPF_DEAD; 2405ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2406ab4382d2SGreg Kroah-Hartman 2407ab4382d2SGreg Kroah-Hartman /* 2408ab4382d2SGreg Kroah-Hartman * Remove the devices from the tty layer 2409ab4382d2SGreg Kroah-Hartman */ 2410ab4382d2SGreg Kroah-Hartman tty_unregister_device(drv->tty_driver, uport->line); 2411ab4382d2SGreg Kroah-Hartman 2412ab4382d2SGreg Kroah-Hartman if (port->tty) 2413ab4382d2SGreg Kroah-Hartman tty_vhangup(port->tty); 2414ab4382d2SGreg Kroah-Hartman 2415ab4382d2SGreg Kroah-Hartman /* 2416ab4382d2SGreg Kroah-Hartman * Free the port IO and memory resources, if any. 2417ab4382d2SGreg Kroah-Hartman */ 2418ab4382d2SGreg Kroah-Hartman if (uport->type != PORT_UNKNOWN) 2419ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 2420ab4382d2SGreg Kroah-Hartman 2421ab4382d2SGreg Kroah-Hartman /* 2422ab4382d2SGreg Kroah-Hartman * Indicate that there isn't a port here anymore. 2423ab4382d2SGreg Kroah-Hartman */ 2424ab4382d2SGreg Kroah-Hartman uport->type = PORT_UNKNOWN; 2425ab4382d2SGreg Kroah-Hartman 2426ab4382d2SGreg Kroah-Hartman state->uart_port = NULL; 2427ab4382d2SGreg Kroah-Hartman mutex_unlock(&port_mutex); 2428ab4382d2SGreg Kroah-Hartman 2429ab4382d2SGreg Kroah-Hartman return 0; 2430ab4382d2SGreg Kroah-Hartman } 2431ab4382d2SGreg Kroah-Hartman 2432ab4382d2SGreg Kroah-Hartman /* 2433ab4382d2SGreg Kroah-Hartman * Are the two ports equivalent? 2434ab4382d2SGreg Kroah-Hartman */ 2435ab4382d2SGreg Kroah-Hartman int uart_match_port(struct uart_port *port1, struct uart_port *port2) 2436ab4382d2SGreg Kroah-Hartman { 2437ab4382d2SGreg Kroah-Hartman if (port1->iotype != port2->iotype) 2438ab4382d2SGreg Kroah-Hartman return 0; 2439ab4382d2SGreg Kroah-Hartman 2440ab4382d2SGreg Kroah-Hartman switch (port1->iotype) { 2441ab4382d2SGreg Kroah-Hartman case UPIO_PORT: 2442ab4382d2SGreg Kroah-Hartman return (port1->iobase == port2->iobase); 2443ab4382d2SGreg Kroah-Hartman case UPIO_HUB6: 2444ab4382d2SGreg Kroah-Hartman return (port1->iobase == port2->iobase) && 2445ab4382d2SGreg Kroah-Hartman (port1->hub6 == port2->hub6); 2446ab4382d2SGreg Kroah-Hartman case UPIO_MEM: 2447ab4382d2SGreg Kroah-Hartman case UPIO_MEM32: 2448ab4382d2SGreg Kroah-Hartman case UPIO_AU: 2449ab4382d2SGreg Kroah-Hartman case UPIO_TSI: 2450ab4382d2SGreg Kroah-Hartman return (port1->mapbase == port2->mapbase); 2451ab4382d2SGreg Kroah-Hartman } 2452ab4382d2SGreg Kroah-Hartman return 0; 2453ab4382d2SGreg Kroah-Hartman } 2454ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_match_port); 2455ab4382d2SGreg Kroah-Hartman 2456ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_write_wakeup); 2457ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_register_driver); 2458ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_unregister_driver); 2459ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_suspend_port); 2460ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_resume_port); 2461ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_add_one_port); 2462ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_remove_one_port); 2463ab4382d2SGreg Kroah-Hartman 2464ab4382d2SGreg Kroah-Hartman MODULE_DESCRIPTION("Serial driver core"); 2465ab4382d2SGreg Kroah-Hartman MODULE_LICENSE("GPL"); 2466