1e3b3d0f5SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0+ 2ab4382d2SGreg Kroah-Hartman /* 3ab4382d2SGreg Kroah-Hartman * Driver core for serial ports 4ab4382d2SGreg Kroah-Hartman * 5ab4382d2SGreg Kroah-Hartman * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. 6ab4382d2SGreg Kroah-Hartman * 7ab4382d2SGreg Kroah-Hartman * Copyright 1999 ARM Limited 8ab4382d2SGreg Kroah-Hartman * Copyright (C) 2000-2001 Deep Blue Solutions Ltd. 9ab4382d2SGreg Kroah-Hartman * 10ab4382d2SGreg Kroah-Hartman * This program is free software; you can redistribute it and/or modify 11ab4382d2SGreg Kroah-Hartman * it under the terms of the GNU General Public License as published by 12ab4382d2SGreg Kroah-Hartman * the Free Software Foundation; either version 2 of the License, or 13ab4382d2SGreg Kroah-Hartman * (at your option) any later version. 14ab4382d2SGreg Kroah-Hartman * 15ab4382d2SGreg Kroah-Hartman * This program is distributed in the hope that it will be useful, 16ab4382d2SGreg Kroah-Hartman * but WITHOUT ANY WARRANTY; without even the implied warranty of 17ab4382d2SGreg Kroah-Hartman * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18ab4382d2SGreg Kroah-Hartman * GNU General Public License for more details. 19ab4382d2SGreg Kroah-Hartman * 20ab4382d2SGreg Kroah-Hartman * You should have received a copy of the GNU General Public License 21ab4382d2SGreg Kroah-Hartman * along with this program; if not, write to the Free Software 22ab4382d2SGreg Kroah-Hartman * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 23ab4382d2SGreg Kroah-Hartman */ 24ab4382d2SGreg Kroah-Hartman #include <linux/module.h> 25ab4382d2SGreg Kroah-Hartman #include <linux/tty.h> 26027d7dacSJiri Slaby #include <linux/tty_flip.h> 27ab4382d2SGreg Kroah-Hartman #include <linux/slab.h> 28174cd4b1SIngo Molnar #include <linux/sched/signal.h> 29ab4382d2SGreg Kroah-Hartman #include <linux/init.h> 30ab4382d2SGreg Kroah-Hartman #include <linux/console.h> 31a208ffd2SGrant Likely #include <linux/of.h> 32ab4382d2SGreg Kroah-Hartman #include <linux/proc_fs.h> 33ab4382d2SGreg Kroah-Hartman #include <linux/seq_file.h> 34ab4382d2SGreg Kroah-Hartman #include <linux/device.h> 35ab4382d2SGreg Kroah-Hartman #include <linux/serial.h> /* for serial_state and serial_icounter_struct */ 36ab4382d2SGreg Kroah-Hartman #include <linux/serial_core.h> 37ab4382d2SGreg Kroah-Hartman #include <linux/delay.h> 38ab4382d2SGreg Kroah-Hartman #include <linux/mutex.h> 39ab4382d2SGreg Kroah-Hartman 40aef3ad10SAndy Shevchenko #include <linux/irq.h> 417c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 42ab4382d2SGreg Kroah-Hartman 43ab4382d2SGreg Kroah-Hartman /* 44ab4382d2SGreg Kroah-Hartman * This is used to lock changes in serial line configuration. 45ab4382d2SGreg Kroah-Hartman */ 46ab4382d2SGreg Kroah-Hartman static DEFINE_MUTEX(port_mutex); 47ab4382d2SGreg Kroah-Hartman 48ab4382d2SGreg Kroah-Hartman /* 49ab4382d2SGreg Kroah-Hartman * lockdep: port->lock is initialized in two places, but we 50ab4382d2SGreg Kroah-Hartman * want only one lock-class: 51ab4382d2SGreg Kroah-Hartman */ 52ab4382d2SGreg Kroah-Hartman static struct lock_class_key port_lock_key; 53ab4382d2SGreg Kroah-Hartman 54ab4382d2SGreg Kroah-Hartman #define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8) 55ab4382d2SGreg Kroah-Hartman 56ab4382d2SGreg Kroah-Hartman static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, 57ab4382d2SGreg Kroah-Hartman struct ktermios *old_termios); 581f33a51dSJiri Slaby static void uart_wait_until_sent(struct tty_struct *tty, int timeout); 596f538fe3SLinus Walleij static void uart_change_pm(struct uart_state *state, 606f538fe3SLinus Walleij enum uart_pm_state pm_state); 61ab4382d2SGreg Kroah-Hartman 62b922e19dSJiri Slaby static void uart_port_shutdown(struct tty_port *port); 63b922e19dSJiri Slaby 64299245a1SPeter Hurley static int uart_dcd_enabled(struct uart_port *uport) 65299245a1SPeter Hurley { 66d4260b51SPeter Hurley return !!(uport->status & UPSTAT_DCD_ENABLE); 67299245a1SPeter Hurley } 68299245a1SPeter Hurley 699ed19428SPeter Hurley static inline struct uart_port *uart_port_ref(struct uart_state *state) 709ed19428SPeter Hurley { 719ed19428SPeter Hurley if (atomic_add_unless(&state->refcount, 1, 0)) 729ed19428SPeter Hurley return state->uart_port; 739ed19428SPeter Hurley return NULL; 749ed19428SPeter Hurley } 759ed19428SPeter Hurley 769ed19428SPeter Hurley static inline void uart_port_deref(struct uart_port *uport) 779ed19428SPeter Hurley { 78ef510beaSAndy Shevchenko if (atomic_dec_and_test(&uport->state->refcount)) 799ed19428SPeter Hurley wake_up(&uport->state->remove_wait); 809ed19428SPeter Hurley } 819ed19428SPeter Hurley 829ed19428SPeter Hurley #define uart_port_lock(state, flags) \ 839ed19428SPeter Hurley ({ \ 849ed19428SPeter Hurley struct uart_port *__uport = uart_port_ref(state); \ 859ed19428SPeter Hurley if (__uport) \ 869ed19428SPeter Hurley spin_lock_irqsave(&__uport->lock, flags); \ 879ed19428SPeter Hurley __uport; \ 889ed19428SPeter Hurley }) 899ed19428SPeter Hurley 909ed19428SPeter Hurley #define uart_port_unlock(uport, flags) \ 919ed19428SPeter Hurley ({ \ 929ed19428SPeter Hurley struct uart_port *__uport = uport; \ 93ef510beaSAndy Shevchenko if (__uport) { \ 949ed19428SPeter Hurley spin_unlock_irqrestore(&__uport->lock, flags); \ 959ed19428SPeter Hurley uart_port_deref(__uport); \ 96ef510beaSAndy Shevchenko } \ 979ed19428SPeter Hurley }) 989ed19428SPeter Hurley 994047b371SPeter Hurley static inline struct uart_port *uart_port_check(struct uart_state *state) 1004047b371SPeter Hurley { 1017da4b8b7SPeter Hurley lockdep_assert_held(&state->port.mutex); 1024047b371SPeter Hurley return state->uart_port; 1034047b371SPeter Hurley } 1044047b371SPeter Hurley 105ab4382d2SGreg Kroah-Hartman /* 106ab4382d2SGreg Kroah-Hartman * This routine is used by the interrupt handler to schedule processing in 107ab4382d2SGreg Kroah-Hartman * the software interrupt portion of the driver. 108ab4382d2SGreg Kroah-Hartman */ 109ab4382d2SGreg Kroah-Hartman void uart_write_wakeup(struct uart_port *port) 110ab4382d2SGreg Kroah-Hartman { 111ab4382d2SGreg Kroah-Hartman struct uart_state *state = port->state; 112ab4382d2SGreg Kroah-Hartman /* 113ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 114ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 115ab4382d2SGreg Kroah-Hartman */ 116ab4382d2SGreg Kroah-Hartman BUG_ON(!state); 117d0f4bce2SRob Herring tty_port_tty_wakeup(&state->port); 118ab4382d2SGreg Kroah-Hartman } 119ab4382d2SGreg Kroah-Hartman 120ab4382d2SGreg Kroah-Hartman static void uart_stop(struct tty_struct *tty) 121ab4382d2SGreg Kroah-Hartman { 122ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1239ed19428SPeter Hurley struct uart_port *port; 124ab4382d2SGreg Kroah-Hartman unsigned long flags; 125ab4382d2SGreg Kroah-Hartman 1269ed19428SPeter Hurley port = uart_port_lock(state, flags); 1279ed19428SPeter Hurley if (port) 128ab4382d2SGreg Kroah-Hartman port->ops->stop_tx(port); 1299ed19428SPeter Hurley uart_port_unlock(port, flags); 130ab4382d2SGreg Kroah-Hartman } 131ab4382d2SGreg Kroah-Hartman 132ab4382d2SGreg Kroah-Hartman static void __uart_start(struct tty_struct *tty) 133ab4382d2SGreg Kroah-Hartman { 134ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 135ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 136ab4382d2SGreg Kroah-Hartman 1379ed19428SPeter Hurley if (port && !uart_tx_stopped(port)) 138ab4382d2SGreg Kroah-Hartman port->ops->start_tx(port); 139ab4382d2SGreg Kroah-Hartman } 140ab4382d2SGreg Kroah-Hartman 141ab4382d2SGreg Kroah-Hartman static void uart_start(struct tty_struct *tty) 142ab4382d2SGreg Kroah-Hartman { 143ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1449ed19428SPeter Hurley struct uart_port *port; 145ab4382d2SGreg Kroah-Hartman unsigned long flags; 146ab4382d2SGreg Kroah-Hartman 1479ed19428SPeter Hurley port = uart_port_lock(state, flags); 148ab4382d2SGreg Kroah-Hartman __uart_start(tty); 1499ed19428SPeter Hurley uart_port_unlock(port, flags); 150ab4382d2SGreg Kroah-Hartman } 151ab4382d2SGreg Kroah-Hartman 152f4581cabSDenys Vlasenko static void 153ab4382d2SGreg Kroah-Hartman uart_update_mctrl(struct uart_port *port, unsigned int set, unsigned int clear) 154ab4382d2SGreg Kroah-Hartman { 155ab4382d2SGreg Kroah-Hartman unsigned long flags; 156ab4382d2SGreg Kroah-Hartman unsigned int old; 157ab4382d2SGreg Kroah-Hartman 158ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 159ab4382d2SGreg Kroah-Hartman old = port->mctrl; 160ab4382d2SGreg Kroah-Hartman port->mctrl = (old & ~clear) | set; 161ab4382d2SGreg Kroah-Hartman if (old != port->mctrl) 162ab4382d2SGreg Kroah-Hartman port->ops->set_mctrl(port, port->mctrl); 163ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 164ab4382d2SGreg Kroah-Hartman } 165ab4382d2SGreg Kroah-Hartman 166ab4382d2SGreg Kroah-Hartman #define uart_set_mctrl(port, set) uart_update_mctrl(port, set, 0) 167ab4382d2SGreg Kroah-Hartman #define uart_clear_mctrl(port, clear) uart_update_mctrl(port, 0, clear) 168ab4382d2SGreg Kroah-Hartman 169a6845e1eSRafael Gago static void uart_port_dtr_rts(struct uart_port *uport, int raise) 170a6845e1eSRafael Gago { 171a6845e1eSRafael Gago int rs485_on = uport->rs485_config && 172a6845e1eSRafael Gago (uport->rs485.flags & SER_RS485_ENABLED); 173a6845e1eSRafael Gago int RTS_after_send = !!(uport->rs485.flags & SER_RS485_RTS_AFTER_SEND); 174a6845e1eSRafael Gago 175a6845e1eSRafael Gago if (raise) { 176a6845e1eSRafael Gago if (rs485_on && !RTS_after_send) { 177a6845e1eSRafael Gago uart_set_mctrl(uport, TIOCM_DTR); 178a6845e1eSRafael Gago uart_clear_mctrl(uport, TIOCM_RTS); 179a6845e1eSRafael Gago } else { 180a6845e1eSRafael Gago uart_set_mctrl(uport, TIOCM_DTR | TIOCM_RTS); 181a6845e1eSRafael Gago } 182a6845e1eSRafael Gago } else { 183a6845e1eSRafael Gago unsigned int clear = TIOCM_DTR; 184a6845e1eSRafael Gago 185a6845e1eSRafael Gago clear |= (!rs485_on || !RTS_after_send) ? TIOCM_RTS : 0; 186a6845e1eSRafael Gago uart_clear_mctrl(uport, clear); 187a6845e1eSRafael Gago } 188a6845e1eSRafael Gago } 189a6845e1eSRafael Gago 190ab4382d2SGreg Kroah-Hartman /* 191ab4382d2SGreg Kroah-Hartman * Startup the port. This will be called once per open. All calls 192ab4382d2SGreg Kroah-Hartman * will be serialised by the per-port mutex. 193ab4382d2SGreg Kroah-Hartman */ 194c0d92be6SJiri Slaby static int uart_port_startup(struct tty_struct *tty, struct uart_state *state, 195c0d92be6SJiri Slaby int init_hw) 196ab4382d2SGreg Kroah-Hartman { 1974047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 198ab4382d2SGreg Kroah-Hartman unsigned long page; 199ab4382d2SGreg Kroah-Hartman int retval = 0; 200ab4382d2SGreg Kroah-Hartman 201ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) 202c0d92be6SJiri Slaby return 1; 203ab4382d2SGreg Kroah-Hartman 204ab4382d2SGreg Kroah-Hartman /* 2057deb39edSThomas Pfaff * Make sure the device is in D0 state. 2067deb39edSThomas Pfaff */ 2077deb39edSThomas Pfaff uart_change_pm(state, UART_PM_STATE_ON); 2087deb39edSThomas Pfaff 2097deb39edSThomas Pfaff /* 210ab4382d2SGreg Kroah-Hartman * Initialise and allocate the transmit and temporary 211ab4382d2SGreg Kroah-Hartman * buffer. 212ab4382d2SGreg Kroah-Hartman */ 213ab4382d2SGreg Kroah-Hartman if (!state->xmit.buf) { 214ab4382d2SGreg Kroah-Hartman /* This is protected by the per port mutex */ 215ab4382d2SGreg Kroah-Hartman page = get_zeroed_page(GFP_KERNEL); 216ab4382d2SGreg Kroah-Hartman if (!page) 217ab4382d2SGreg Kroah-Hartman return -ENOMEM; 218ab4382d2SGreg Kroah-Hartman 219ab4382d2SGreg Kroah-Hartman state->xmit.buf = (unsigned char *) page; 220ab4382d2SGreg Kroah-Hartman uart_circ_clear(&state->xmit); 221ab4382d2SGreg Kroah-Hartman } 222ab4382d2SGreg Kroah-Hartman 223ab4382d2SGreg Kroah-Hartman retval = uport->ops->startup(uport); 224ab4382d2SGreg Kroah-Hartman if (retval == 0) { 225c7d7abffSJiri Slaby if (uart_console(uport) && uport->cons->cflag) { 226adc8d746SAlan Cox tty->termios.c_cflag = uport->cons->cflag; 227c7d7abffSJiri Slaby uport->cons->cflag = 0; 228c7d7abffSJiri Slaby } 229ab4382d2SGreg Kroah-Hartman /* 230ab4382d2SGreg Kroah-Hartman * Initialise the hardware port settings. 231ab4382d2SGreg Kroah-Hartman */ 232ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 233ab4382d2SGreg Kroah-Hartman 234ab4382d2SGreg Kroah-Hartman /* 235ab4382d2SGreg Kroah-Hartman * Setup the RTS and DTR signals once the 236ab4382d2SGreg Kroah-Hartman * port is open and ready to respond. 237ab4382d2SGreg Kroah-Hartman */ 2389db276f8SPeter Hurley if (init_hw && C_BAUD(tty)) 239a6845e1eSRafael Gago uart_port_dtr_rts(uport, 1); 240ab4382d2SGreg Kroah-Hartman } 241ab4382d2SGreg Kroah-Hartman 2420055197eSJiri Slaby /* 2430055197eSJiri Slaby * This is to allow setserial on this port. People may want to set 2440055197eSJiri Slaby * port/irq/type and then reconfigure the port properly if it failed 2450055197eSJiri Slaby * now. 2460055197eSJiri Slaby */ 247ab4382d2SGreg Kroah-Hartman if (retval && capable(CAP_SYS_ADMIN)) 248c0d92be6SJiri Slaby return 1; 249c0d92be6SJiri Slaby 250c0d92be6SJiri Slaby return retval; 251c0d92be6SJiri Slaby } 252c0d92be6SJiri Slaby 253c0d92be6SJiri Slaby static int uart_startup(struct tty_struct *tty, struct uart_state *state, 254c0d92be6SJiri Slaby int init_hw) 255c0d92be6SJiri Slaby { 256c0d92be6SJiri Slaby struct tty_port *port = &state->port; 257c0d92be6SJiri Slaby int retval; 258c0d92be6SJiri Slaby 259d41861caSPeter Hurley if (tty_port_initialized(port)) 260c0d92be6SJiri Slaby return 0; 261c0d92be6SJiri Slaby 262c0d92be6SJiri Slaby retval = uart_port_startup(tty, state, init_hw); 263b3b57646SRob Herring if (retval) 264b3b57646SRob Herring set_bit(TTY_IO_ERROR, &tty->flags); 265ab4382d2SGreg Kroah-Hartman 266ab4382d2SGreg Kroah-Hartman return retval; 267ab4382d2SGreg Kroah-Hartman } 268ab4382d2SGreg Kroah-Hartman 269ab4382d2SGreg Kroah-Hartman /* 270ab4382d2SGreg Kroah-Hartman * This routine will shutdown a serial port; interrupts are disabled, and 271ab4382d2SGreg Kroah-Hartman * DTR is dropped if the hangup on close termio flag is on. Calls to 272ab4382d2SGreg Kroah-Hartman * uart_shutdown are serialised by the per-port semaphore. 273af224ca2SPeter Hurley * 274af224ca2SPeter Hurley * uport == NULL if uart_port has already been removed 275ab4382d2SGreg Kroah-Hartman */ 276ab4382d2SGreg Kroah-Hartman static void uart_shutdown(struct tty_struct *tty, struct uart_state *state) 277ab4382d2SGreg Kroah-Hartman { 2784047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 279ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 280ab4382d2SGreg Kroah-Hartman 281ab4382d2SGreg Kroah-Hartman /* 282ab4382d2SGreg Kroah-Hartman * Set the TTY IO error marker 283ab4382d2SGreg Kroah-Hartman */ 284ab4382d2SGreg Kroah-Hartman if (tty) 285ab4382d2SGreg Kroah-Hartman set_bit(TTY_IO_ERROR, &tty->flags); 286ab4382d2SGreg Kroah-Hartman 287d41861caSPeter Hurley if (tty_port_initialized(port)) { 288d41861caSPeter Hurley tty_port_set_initialized(port, 0); 289d41861caSPeter Hurley 290ab4382d2SGreg Kroah-Hartman /* 291ab4382d2SGreg Kroah-Hartman * Turn off DTR and RTS early. 292ab4382d2SGreg Kroah-Hartman */ 293af224ca2SPeter Hurley if (uport && uart_console(uport) && tty) 294ae84db96SPeter Hurley uport->cons->cflag = tty->termios.c_cflag; 295ae84db96SPeter Hurley 2969db276f8SPeter Hurley if (!tty || C_HUPCL(tty)) 297a6845e1eSRafael Gago uart_port_dtr_rts(uport, 0); 298ab4382d2SGreg Kroah-Hartman 299b922e19dSJiri Slaby uart_port_shutdown(port); 300ab4382d2SGreg Kroah-Hartman } 301ab4382d2SGreg Kroah-Hartman 302ab4382d2SGreg Kroah-Hartman /* 303d208a3bfSDoug Anderson * It's possible for shutdown to be called after suspend if we get 304d208a3bfSDoug Anderson * a DCD drop (hangup) at just the right time. Clear suspended bit so 305d208a3bfSDoug Anderson * we don't try to resume a port that has been shutdown. 306ab4382d2SGreg Kroah-Hartman */ 30780f02d54SPeter Hurley tty_port_set_suspended(port, 0); 308ab4382d2SGreg Kroah-Hartman 309ab4382d2SGreg Kroah-Hartman /* 310ab4382d2SGreg Kroah-Hartman * Free the transmit buffer page. 311ab4382d2SGreg Kroah-Hartman */ 312ab4382d2SGreg Kroah-Hartman if (state->xmit.buf) { 313ab4382d2SGreg Kroah-Hartman free_page((unsigned long)state->xmit.buf); 314ab4382d2SGreg Kroah-Hartman state->xmit.buf = NULL; 315ab4382d2SGreg Kroah-Hartman } 316ab4382d2SGreg Kroah-Hartman } 317ab4382d2SGreg Kroah-Hartman 318ab4382d2SGreg Kroah-Hartman /** 319ab4382d2SGreg Kroah-Hartman * uart_update_timeout - update per-port FIFO timeout. 320ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port 321ab4382d2SGreg Kroah-Hartman * @cflag: termios cflag value 322ab4382d2SGreg Kroah-Hartman * @baud: speed of the port 323ab4382d2SGreg Kroah-Hartman * 324ab4382d2SGreg Kroah-Hartman * Set the port FIFO timeout value. The @cflag value should 325ab4382d2SGreg Kroah-Hartman * reflect the actual hardware settings. 326ab4382d2SGreg Kroah-Hartman */ 327ab4382d2SGreg Kroah-Hartman void 328ab4382d2SGreg Kroah-Hartman uart_update_timeout(struct uart_port *port, unsigned int cflag, 329ab4382d2SGreg Kroah-Hartman unsigned int baud) 330ab4382d2SGreg Kroah-Hartman { 331ab4382d2SGreg Kroah-Hartman unsigned int bits; 332ab4382d2SGreg Kroah-Hartman 333ab4382d2SGreg Kroah-Hartman /* byte size and parity */ 334ab4382d2SGreg Kroah-Hartman switch (cflag & CSIZE) { 335ab4382d2SGreg Kroah-Hartman case CS5: 336ab4382d2SGreg Kroah-Hartman bits = 7; 337ab4382d2SGreg Kroah-Hartman break; 338ab4382d2SGreg Kroah-Hartman case CS6: 339ab4382d2SGreg Kroah-Hartman bits = 8; 340ab4382d2SGreg Kroah-Hartman break; 341ab4382d2SGreg Kroah-Hartman case CS7: 342ab4382d2SGreg Kroah-Hartman bits = 9; 343ab4382d2SGreg Kroah-Hartman break; 344ab4382d2SGreg Kroah-Hartman default: 345ab4382d2SGreg Kroah-Hartman bits = 10; 346ab4382d2SGreg Kroah-Hartman break; /* CS8 */ 347ab4382d2SGreg Kroah-Hartman } 348ab4382d2SGreg Kroah-Hartman 349ab4382d2SGreg Kroah-Hartman if (cflag & CSTOPB) 350ab4382d2SGreg Kroah-Hartman bits++; 351ab4382d2SGreg Kroah-Hartman if (cflag & PARENB) 352ab4382d2SGreg Kroah-Hartman bits++; 353ab4382d2SGreg Kroah-Hartman 354ab4382d2SGreg Kroah-Hartman /* 355ab4382d2SGreg Kroah-Hartman * The total number of bits to be transmitted in the fifo. 356ab4382d2SGreg Kroah-Hartman */ 357ab4382d2SGreg Kroah-Hartman bits = bits * port->fifosize; 358ab4382d2SGreg Kroah-Hartman 359ab4382d2SGreg Kroah-Hartman /* 360ab4382d2SGreg Kroah-Hartman * Figure the timeout to send the above number of bits. 361ab4382d2SGreg Kroah-Hartman * Add .02 seconds of slop 362ab4382d2SGreg Kroah-Hartman */ 363ab4382d2SGreg Kroah-Hartman port->timeout = (HZ * bits) / baud + HZ/50; 364ab4382d2SGreg Kroah-Hartman } 365ab4382d2SGreg Kroah-Hartman 366ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_update_timeout); 367ab4382d2SGreg Kroah-Hartman 368ab4382d2SGreg Kroah-Hartman /** 369ab4382d2SGreg Kroah-Hartman * uart_get_baud_rate - return baud rate for a particular port 370ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port in question. 371ab4382d2SGreg Kroah-Hartman * @termios: desired termios settings. 372ab4382d2SGreg Kroah-Hartman * @old: old termios (or NULL) 373ab4382d2SGreg Kroah-Hartman * @min: minimum acceptable baud rate 374ab4382d2SGreg Kroah-Hartman * @max: maximum acceptable baud rate 375ab4382d2SGreg Kroah-Hartman * 376ab4382d2SGreg Kroah-Hartman * Decode the termios structure into a numeric baud rate, 377ab4382d2SGreg Kroah-Hartman * taking account of the magic 38400 baud rate (with spd_* 378ab4382d2SGreg Kroah-Hartman * flags), and mapping the %B0 rate to 9600 baud. 379ab4382d2SGreg Kroah-Hartman * 380ab4382d2SGreg Kroah-Hartman * If the new baud rate is invalid, try the old termios setting. 381ab4382d2SGreg Kroah-Hartman * If it's still invalid, we try 9600 baud. 382ab4382d2SGreg Kroah-Hartman * 383ab4382d2SGreg Kroah-Hartman * Update the @termios structure to reflect the baud rate 384ab4382d2SGreg Kroah-Hartman * we're actually going to be using. Don't do this for the case 385ab4382d2SGreg Kroah-Hartman * where B0 is requested ("hang up"). 386ab4382d2SGreg Kroah-Hartman */ 387ab4382d2SGreg Kroah-Hartman unsigned int 388ab4382d2SGreg Kroah-Hartman uart_get_baud_rate(struct uart_port *port, struct ktermios *termios, 389ab4382d2SGreg Kroah-Hartman struct ktermios *old, unsigned int min, unsigned int max) 390ab4382d2SGreg Kroah-Hartman { 391f10a2233SJoakim Nordell unsigned int try; 392f10a2233SJoakim Nordell unsigned int baud; 393f10a2233SJoakim Nordell unsigned int altbaud; 394ab4382d2SGreg Kroah-Hartman int hung_up = 0; 395ab4382d2SGreg Kroah-Hartman upf_t flags = port->flags & UPF_SPD_MASK; 396ab4382d2SGreg Kroah-Hartman 397f10a2233SJoakim Nordell switch (flags) { 398f10a2233SJoakim Nordell case UPF_SPD_HI: 399ab4382d2SGreg Kroah-Hartman altbaud = 57600; 400f10a2233SJoakim Nordell break; 401f10a2233SJoakim Nordell case UPF_SPD_VHI: 402ab4382d2SGreg Kroah-Hartman altbaud = 115200; 403f10a2233SJoakim Nordell break; 404f10a2233SJoakim Nordell case UPF_SPD_SHI: 405ab4382d2SGreg Kroah-Hartman altbaud = 230400; 406f10a2233SJoakim Nordell break; 407f10a2233SJoakim Nordell case UPF_SPD_WARP: 408ab4382d2SGreg Kroah-Hartman altbaud = 460800; 409f10a2233SJoakim Nordell break; 410f10a2233SJoakim Nordell default: 411f10a2233SJoakim Nordell altbaud = 38400; 412f10a2233SJoakim Nordell break; 413f10a2233SJoakim Nordell } 414ab4382d2SGreg Kroah-Hartman 415ab4382d2SGreg Kroah-Hartman for (try = 0; try < 2; try++) { 416ab4382d2SGreg Kroah-Hartman baud = tty_termios_baud_rate(termios); 417ab4382d2SGreg Kroah-Hartman 418ab4382d2SGreg Kroah-Hartman /* 419ab4382d2SGreg Kroah-Hartman * The spd_hi, spd_vhi, spd_shi, spd_warp kludge... 420ab4382d2SGreg Kroah-Hartman * Die! Die! Die! 421ab4382d2SGreg Kroah-Hartman */ 422547039ecSPeter Hurley if (try == 0 && baud == 38400) 423ab4382d2SGreg Kroah-Hartman baud = altbaud; 424ab4382d2SGreg Kroah-Hartman 425ab4382d2SGreg Kroah-Hartman /* 426ab4382d2SGreg Kroah-Hartman * Special case: B0 rate. 427ab4382d2SGreg Kroah-Hartman */ 428ab4382d2SGreg Kroah-Hartman if (baud == 0) { 429ab4382d2SGreg Kroah-Hartman hung_up = 1; 430ab4382d2SGreg Kroah-Hartman baud = 9600; 431ab4382d2SGreg Kroah-Hartman } 432ab4382d2SGreg Kroah-Hartman 433ab4382d2SGreg Kroah-Hartman if (baud >= min && baud <= max) 434ab4382d2SGreg Kroah-Hartman return baud; 435ab4382d2SGreg Kroah-Hartman 436ab4382d2SGreg Kroah-Hartman /* 437ab4382d2SGreg Kroah-Hartman * Oops, the quotient was zero. Try again with 438ab4382d2SGreg Kroah-Hartman * the old baud rate if possible. 439ab4382d2SGreg Kroah-Hartman */ 440ab4382d2SGreg Kroah-Hartman termios->c_cflag &= ~CBAUD; 441ab4382d2SGreg Kroah-Hartman if (old) { 442ab4382d2SGreg Kroah-Hartman baud = tty_termios_baud_rate(old); 443ab4382d2SGreg Kroah-Hartman if (!hung_up) 444ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 445ab4382d2SGreg Kroah-Hartman baud, baud); 446ab4382d2SGreg Kroah-Hartman old = NULL; 447ab4382d2SGreg Kroah-Hartman continue; 448ab4382d2SGreg Kroah-Hartman } 449ab4382d2SGreg Kroah-Hartman 450ab4382d2SGreg Kroah-Hartman /* 451ab4382d2SGreg Kroah-Hartman * As a last resort, if the range cannot be met then clip to 452ab4382d2SGreg Kroah-Hartman * the nearest chip supported rate. 453ab4382d2SGreg Kroah-Hartman */ 454ab4382d2SGreg Kroah-Hartman if (!hung_up) { 455ab4382d2SGreg Kroah-Hartman if (baud <= min) 456ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 457ab4382d2SGreg Kroah-Hartman min + 1, min + 1); 458ab4382d2SGreg Kroah-Hartman else 459ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 460ab4382d2SGreg Kroah-Hartman max - 1, max - 1); 461ab4382d2SGreg Kroah-Hartman } 462ab4382d2SGreg Kroah-Hartman } 463ab4382d2SGreg Kroah-Hartman /* Should never happen */ 464ab4382d2SGreg Kroah-Hartman WARN_ON(1); 465ab4382d2SGreg Kroah-Hartman return 0; 466ab4382d2SGreg Kroah-Hartman } 467ab4382d2SGreg Kroah-Hartman 468ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_get_baud_rate); 469ab4382d2SGreg Kroah-Hartman 470ab4382d2SGreg Kroah-Hartman /** 471ab4382d2SGreg Kroah-Hartman * uart_get_divisor - return uart clock divisor 472ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port. 473ab4382d2SGreg Kroah-Hartman * @baud: desired baud rate 474ab4382d2SGreg Kroah-Hartman * 475ab4382d2SGreg Kroah-Hartman * Calculate the uart clock divisor for the port. 476ab4382d2SGreg Kroah-Hartman */ 477ab4382d2SGreg Kroah-Hartman unsigned int 478ab4382d2SGreg Kroah-Hartman uart_get_divisor(struct uart_port *port, unsigned int baud) 479ab4382d2SGreg Kroah-Hartman { 480ab4382d2SGreg Kroah-Hartman unsigned int quot; 481ab4382d2SGreg Kroah-Hartman 482ab4382d2SGreg Kroah-Hartman /* 483ab4382d2SGreg Kroah-Hartman * Old custom speed handling. 484ab4382d2SGreg Kroah-Hartman */ 485ab4382d2SGreg Kroah-Hartman if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) 486ab4382d2SGreg Kroah-Hartman quot = port->custom_divisor; 487ab4382d2SGreg Kroah-Hartman else 48897d24634SUwe Kleine-König quot = DIV_ROUND_CLOSEST(port->uartclk, 16 * baud); 489ab4382d2SGreg Kroah-Hartman 490ab4382d2SGreg Kroah-Hartman return quot; 491ab4382d2SGreg Kroah-Hartman } 492ab4382d2SGreg Kroah-Hartman 493ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_get_divisor); 494ab4382d2SGreg Kroah-Hartman 4957c8ab967SPeter Hurley /* Caller holds port mutex */ 496ab4382d2SGreg Kroah-Hartman static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, 497ab4382d2SGreg Kroah-Hartman struct ktermios *old_termios) 498ab4382d2SGreg Kroah-Hartman { 4994047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 500ab4382d2SGreg Kroah-Hartman struct ktermios *termios; 501391f93f2SPeter Hurley int hw_stopped; 502ab4382d2SGreg Kroah-Hartman 503ab4382d2SGreg Kroah-Hartman /* 504ab4382d2SGreg Kroah-Hartman * If we have no tty, termios, or the port does not exist, 505ab4382d2SGreg Kroah-Hartman * then we can't set the parameters for this port. 506ab4382d2SGreg Kroah-Hartman */ 507adc8d746SAlan Cox if (!tty || uport->type == PORT_UNKNOWN) 508ab4382d2SGreg Kroah-Hartman return; 509ab4382d2SGreg Kroah-Hartman 510adc8d746SAlan Cox termios = &tty->termios; 511c18b55fdSPeter Hurley uport->ops->set_termios(uport, termios, old_termios); 512ab4382d2SGreg Kroah-Hartman 513ab4382d2SGreg Kroah-Hartman /* 514299245a1SPeter Hurley * Set modem status enables based on termios cflag 515ab4382d2SGreg Kroah-Hartman */ 516299245a1SPeter Hurley spin_lock_irq(&uport->lock); 517ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CRTSCTS) 518299245a1SPeter Hurley uport->status |= UPSTAT_CTS_ENABLE; 519ab4382d2SGreg Kroah-Hartman else 520299245a1SPeter Hurley uport->status &= ~UPSTAT_CTS_ENABLE; 521ab4382d2SGreg Kroah-Hartman 522ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CLOCAL) 523299245a1SPeter Hurley uport->status &= ~UPSTAT_DCD_ENABLE; 524ab4382d2SGreg Kroah-Hartman else 525299245a1SPeter Hurley uport->status |= UPSTAT_DCD_ENABLE; 526391f93f2SPeter Hurley 527391f93f2SPeter Hurley /* reset sw-assisted CTS flow control based on (possibly) new mode */ 528391f93f2SPeter Hurley hw_stopped = uport->hw_stopped; 529391f93f2SPeter Hurley uport->hw_stopped = uart_softcts_mode(uport) && 530391f93f2SPeter Hurley !(uport->ops->get_mctrl(uport) & TIOCM_CTS); 531391f93f2SPeter Hurley if (uport->hw_stopped) { 532391f93f2SPeter Hurley if (!hw_stopped) 533391f93f2SPeter Hurley uport->ops->stop_tx(uport); 534391f93f2SPeter Hurley } else { 535391f93f2SPeter Hurley if (hw_stopped) 536391f93f2SPeter Hurley __uart_start(tty); 537391f93f2SPeter Hurley } 538299245a1SPeter Hurley spin_unlock_irq(&uport->lock); 539ab4382d2SGreg Kroah-Hartman } 540ab4382d2SGreg Kroah-Hartman 541f5291eccSPeter Hurley static int uart_put_char(struct tty_struct *tty, unsigned char c) 542ab4382d2SGreg Kroah-Hartman { 543f5291eccSPeter Hurley struct uart_state *state = tty->driver_data; 5449ed19428SPeter Hurley struct uart_port *port; 545f5291eccSPeter Hurley struct circ_buf *circ; 546ab4382d2SGreg Kroah-Hartman unsigned long flags; 547ab4382d2SGreg Kroah-Hartman int ret = 0; 548ab4382d2SGreg Kroah-Hartman 549f5291eccSPeter Hurley circ = &state->xmit; 550ab4382d2SGreg Kroah-Hartman if (!circ->buf) 551ab4382d2SGreg Kroah-Hartman return 0; 552ab4382d2SGreg Kroah-Hartman 5539ed19428SPeter Hurley port = uart_port_lock(state, flags); 5549ed19428SPeter Hurley if (port && uart_circ_chars_free(circ) != 0) { 555ab4382d2SGreg Kroah-Hartman circ->buf[circ->head] = c; 556ab4382d2SGreg Kroah-Hartman circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1); 557ab4382d2SGreg Kroah-Hartman ret = 1; 558ab4382d2SGreg Kroah-Hartman } 5599ed19428SPeter Hurley uart_port_unlock(port, flags); 560ab4382d2SGreg Kroah-Hartman return ret; 561ab4382d2SGreg Kroah-Hartman } 562ab4382d2SGreg Kroah-Hartman 563ab4382d2SGreg Kroah-Hartman static void uart_flush_chars(struct tty_struct *tty) 564ab4382d2SGreg Kroah-Hartman { 565ab4382d2SGreg Kroah-Hartman uart_start(tty); 566ab4382d2SGreg Kroah-Hartman } 567ab4382d2SGreg Kroah-Hartman 568ab4382d2SGreg Kroah-Hartman static int uart_write(struct tty_struct *tty, 569ab4382d2SGreg Kroah-Hartman const unsigned char *buf, int count) 570ab4382d2SGreg Kroah-Hartman { 571ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 572ab4382d2SGreg Kroah-Hartman struct uart_port *port; 573ab4382d2SGreg Kroah-Hartman struct circ_buf *circ; 574ab4382d2SGreg Kroah-Hartman unsigned long flags; 575ab4382d2SGreg Kroah-Hartman int c, ret = 0; 576ab4382d2SGreg Kroah-Hartman 577ab4382d2SGreg Kroah-Hartman /* 578ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 579ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 580ab4382d2SGreg Kroah-Hartman */ 581ab4382d2SGreg Kroah-Hartman if (!state) { 582ab4382d2SGreg Kroah-Hartman WARN_ON(1); 583ab4382d2SGreg Kroah-Hartman return -EL3HLT; 584ab4382d2SGreg Kroah-Hartman } 585ab4382d2SGreg Kroah-Hartman 586ab4382d2SGreg Kroah-Hartman circ = &state->xmit; 587ab4382d2SGreg Kroah-Hartman if (!circ->buf) 588ab4382d2SGreg Kroah-Hartman return 0; 589ab4382d2SGreg Kroah-Hartman 5909ed19428SPeter Hurley port = uart_port_lock(state, flags); 5919ed19428SPeter Hurley while (port) { 592ab4382d2SGreg Kroah-Hartman c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE); 593ab4382d2SGreg Kroah-Hartman if (count < c) 594ab4382d2SGreg Kroah-Hartman c = count; 595ab4382d2SGreg Kroah-Hartman if (c <= 0) 596ab4382d2SGreg Kroah-Hartman break; 597ab4382d2SGreg Kroah-Hartman memcpy(circ->buf + circ->head, buf, c); 598ab4382d2SGreg Kroah-Hartman circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1); 599ab4382d2SGreg Kroah-Hartman buf += c; 600ab4382d2SGreg Kroah-Hartman count -= c; 601ab4382d2SGreg Kroah-Hartman ret += c; 602ab4382d2SGreg Kroah-Hartman } 60364dbee31SPeter Hurley 60464dbee31SPeter Hurley __uart_start(tty); 6059ed19428SPeter Hurley uart_port_unlock(port, flags); 606ab4382d2SGreg Kroah-Hartman return ret; 607ab4382d2SGreg Kroah-Hartman } 608ab4382d2SGreg Kroah-Hartman 609ab4382d2SGreg Kroah-Hartman static int uart_write_room(struct tty_struct *tty) 610ab4382d2SGreg Kroah-Hartman { 611ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 6129ed19428SPeter Hurley struct uart_port *port; 613ab4382d2SGreg Kroah-Hartman unsigned long flags; 614ab4382d2SGreg Kroah-Hartman int ret; 615ab4382d2SGreg Kroah-Hartman 6169ed19428SPeter Hurley port = uart_port_lock(state, flags); 617ab4382d2SGreg Kroah-Hartman ret = uart_circ_chars_free(&state->xmit); 6189ed19428SPeter Hurley uart_port_unlock(port, flags); 619ab4382d2SGreg Kroah-Hartman return ret; 620ab4382d2SGreg Kroah-Hartman } 621ab4382d2SGreg Kroah-Hartman 622ab4382d2SGreg Kroah-Hartman static int uart_chars_in_buffer(struct tty_struct *tty) 623ab4382d2SGreg Kroah-Hartman { 624ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 6259ed19428SPeter Hurley struct uart_port *port; 626ab4382d2SGreg Kroah-Hartman unsigned long flags; 627ab4382d2SGreg Kroah-Hartman int ret; 628ab4382d2SGreg Kroah-Hartman 6299ed19428SPeter Hurley port = uart_port_lock(state, flags); 630ab4382d2SGreg Kroah-Hartman ret = uart_circ_chars_pending(&state->xmit); 6319ed19428SPeter Hurley uart_port_unlock(port, flags); 632ab4382d2SGreg Kroah-Hartman return ret; 633ab4382d2SGreg Kroah-Hartman } 634ab4382d2SGreg Kroah-Hartman 635ab4382d2SGreg Kroah-Hartman static void uart_flush_buffer(struct tty_struct *tty) 636ab4382d2SGreg Kroah-Hartman { 637ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 638ab4382d2SGreg Kroah-Hartman struct uart_port *port; 639ab4382d2SGreg Kroah-Hartman unsigned long flags; 640ab4382d2SGreg Kroah-Hartman 641ab4382d2SGreg Kroah-Hartman /* 642ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 643ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 644ab4382d2SGreg Kroah-Hartman */ 645ab4382d2SGreg Kroah-Hartman if (!state) { 646ab4382d2SGreg Kroah-Hartman WARN_ON(1); 647ab4382d2SGreg Kroah-Hartman return; 648ab4382d2SGreg Kroah-Hartman } 649ab4382d2SGreg Kroah-Hartman 650ab4382d2SGreg Kroah-Hartman pr_debug("uart_flush_buffer(%d) called\n", tty->index); 651ab4382d2SGreg Kroah-Hartman 6529ed19428SPeter Hurley port = uart_port_lock(state, flags); 6539ed19428SPeter Hurley if (!port) 6549ed19428SPeter Hurley return; 655ab4382d2SGreg Kroah-Hartman uart_circ_clear(&state->xmit); 656ab4382d2SGreg Kroah-Hartman if (port->ops->flush_buffer) 657ab4382d2SGreg Kroah-Hartman port->ops->flush_buffer(port); 6589ed19428SPeter Hurley uart_port_unlock(port, flags); 659d0f4bce2SRob Herring tty_port_tty_wakeup(&state->port); 660ab4382d2SGreg Kroah-Hartman } 661ab4382d2SGreg Kroah-Hartman 662ab4382d2SGreg Kroah-Hartman /* 663ab4382d2SGreg Kroah-Hartman * This function is used to send a high-priority XON/XOFF character to 664ab4382d2SGreg Kroah-Hartman * the device 665ab4382d2SGreg Kroah-Hartman */ 666ab4382d2SGreg Kroah-Hartman static void uart_send_xchar(struct tty_struct *tty, char ch) 667ab4382d2SGreg Kroah-Hartman { 668ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 6699ed19428SPeter Hurley struct uart_port *port; 670ab4382d2SGreg Kroah-Hartman unsigned long flags; 671ab4382d2SGreg Kroah-Hartman 6729ed19428SPeter Hurley port = uart_port_ref(state); 6739ed19428SPeter Hurley if (!port) 6749ed19428SPeter Hurley return; 6759ed19428SPeter Hurley 676ab4382d2SGreg Kroah-Hartman if (port->ops->send_xchar) 677ab4382d2SGreg Kroah-Hartman port->ops->send_xchar(port, ch); 678ab4382d2SGreg Kroah-Hartman else { 679ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 680c235ccc1SPeter Hurley port->x_char = ch; 681c235ccc1SPeter Hurley if (ch) 682ab4382d2SGreg Kroah-Hartman port->ops->start_tx(port); 683ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 684ab4382d2SGreg Kroah-Hartman } 6859ed19428SPeter Hurley uart_port_deref(port); 686ab4382d2SGreg Kroah-Hartman } 687ab4382d2SGreg Kroah-Hartman 688ab4382d2SGreg Kroah-Hartman static void uart_throttle(struct tty_struct *tty) 689ab4382d2SGreg Kroah-Hartman { 690ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 6919ed19428SPeter Hurley struct uart_port *port; 692391f93f2SPeter Hurley upstat_t mask = 0; 693ab4382d2SGreg Kroah-Hartman 6949ed19428SPeter Hurley port = uart_port_ref(state); 6959ed19428SPeter Hurley if (!port) 6969ed19428SPeter Hurley return; 6979ed19428SPeter Hurley 698ab4382d2SGreg Kroah-Hartman if (I_IXOFF(tty)) 699391f93f2SPeter Hurley mask |= UPSTAT_AUTOXOFF; 7009db276f8SPeter Hurley if (C_CRTSCTS(tty)) 701391f93f2SPeter Hurley mask |= UPSTAT_AUTORTS; 7029aba8d5bSRussell King 703391f93f2SPeter Hurley if (port->status & mask) { 7049aba8d5bSRussell King port->ops->throttle(port); 705391f93f2SPeter Hurley mask &= ~port->status; 7069aba8d5bSRussell King } 7079aba8d5bSRussell King 708391f93f2SPeter Hurley if (mask & UPSTAT_AUTORTS) 7099aba8d5bSRussell King uart_clear_mctrl(port, TIOCM_RTS); 710b4749b97SPeter Hurley 711b4749b97SPeter Hurley if (mask & UPSTAT_AUTOXOFF) 712b4749b97SPeter Hurley uart_send_xchar(tty, STOP_CHAR(tty)); 7139ed19428SPeter Hurley 7149ed19428SPeter Hurley uart_port_deref(port); 715ab4382d2SGreg Kroah-Hartman } 716ab4382d2SGreg Kroah-Hartman 717ab4382d2SGreg Kroah-Hartman static void uart_unthrottle(struct tty_struct *tty) 718ab4382d2SGreg Kroah-Hartman { 719ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 7209ed19428SPeter Hurley struct uart_port *port; 721391f93f2SPeter Hurley upstat_t mask = 0; 722ab4382d2SGreg Kroah-Hartman 7239ed19428SPeter Hurley port = uart_port_ref(state); 7249ed19428SPeter Hurley if (!port) 7259ed19428SPeter Hurley return; 7269ed19428SPeter Hurley 7279aba8d5bSRussell King if (I_IXOFF(tty)) 728391f93f2SPeter Hurley mask |= UPSTAT_AUTOXOFF; 7299db276f8SPeter Hurley if (C_CRTSCTS(tty)) 730391f93f2SPeter Hurley mask |= UPSTAT_AUTORTS; 7319aba8d5bSRussell King 732391f93f2SPeter Hurley if (port->status & mask) { 7339aba8d5bSRussell King port->ops->unthrottle(port); 734391f93f2SPeter Hurley mask &= ~port->status; 7359aba8d5bSRussell King } 7369aba8d5bSRussell King 737391f93f2SPeter Hurley if (mask & UPSTAT_AUTORTS) 738ab4382d2SGreg Kroah-Hartman uart_set_mctrl(port, TIOCM_RTS); 739b4749b97SPeter Hurley 740b4749b97SPeter Hurley if (mask & UPSTAT_AUTOXOFF) 741b4749b97SPeter Hurley uart_send_xchar(tty, START_CHAR(tty)); 7429ed19428SPeter Hurley 7439ed19428SPeter Hurley uart_port_deref(port); 744ab4382d2SGreg Kroah-Hartman } 745ab4382d2SGreg Kroah-Hartman 7464047b371SPeter Hurley static int uart_get_info(struct tty_port *port, struct serial_struct *retinfo) 747ab4382d2SGreg Kroah-Hartman { 7489f109694SAlan Cox struct uart_state *state = container_of(port, struct uart_state, port); 7494047b371SPeter Hurley struct uart_port *uport; 7504047b371SPeter Hurley int ret = -ENODEV; 7517ba2e769SAlan Cox 75237cd0c99SFengguang Wu memset(retinfo, 0, sizeof(*retinfo)); 7537ba2e769SAlan Cox 7543abe8c76SPeter Hurley /* 7553abe8c76SPeter Hurley * Ensure the state we copy is consistent and no hardware changes 7563abe8c76SPeter Hurley * occur as we go 7573abe8c76SPeter Hurley */ 7583abe8c76SPeter Hurley mutex_lock(&port->mutex); 7594047b371SPeter Hurley uport = uart_port_check(state); 7604047b371SPeter Hurley if (!uport) 7614047b371SPeter Hurley goto out; 7624047b371SPeter Hurley 7637ba2e769SAlan Cox retinfo->type = uport->type; 7647ba2e769SAlan Cox retinfo->line = uport->line; 7657ba2e769SAlan Cox retinfo->port = uport->iobase; 7667ba2e769SAlan Cox if (HIGH_BITS_OFFSET) 7677ba2e769SAlan Cox retinfo->port_high = (long) uport->iobase >> HIGH_BITS_OFFSET; 7687ba2e769SAlan Cox retinfo->irq = uport->irq; 769a17e74c5SAndy Shevchenko retinfo->flags = (__force int)uport->flags; 7707ba2e769SAlan Cox retinfo->xmit_fifo_size = uport->fifosize; 7717ba2e769SAlan Cox retinfo->baud_base = uport->uartclk / 16; 7727ba2e769SAlan Cox retinfo->close_delay = jiffies_to_msecs(port->close_delay) / 10; 7737ba2e769SAlan Cox retinfo->closing_wait = port->closing_wait == ASYNC_CLOSING_WAIT_NONE ? 7747ba2e769SAlan Cox ASYNC_CLOSING_WAIT_NONE : 7757ba2e769SAlan Cox jiffies_to_msecs(port->closing_wait) / 10; 7767ba2e769SAlan Cox retinfo->custom_divisor = uport->custom_divisor; 7777ba2e769SAlan Cox retinfo->hub6 = uport->hub6; 7787ba2e769SAlan Cox retinfo->io_type = uport->iotype; 7797ba2e769SAlan Cox retinfo->iomem_reg_shift = uport->regshift; 7807ba2e769SAlan Cox retinfo->iomem_base = (void *)(unsigned long)uport->mapbase; 7814047b371SPeter Hurley 7824047b371SPeter Hurley ret = 0; 7834047b371SPeter Hurley out: 784ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 7854047b371SPeter Hurley return ret; 7869f109694SAlan Cox } 7879f109694SAlan Cox 7889f109694SAlan Cox static int uart_get_info_user(struct tty_port *port, 7899f109694SAlan Cox struct serial_struct __user *retinfo) 7909f109694SAlan Cox { 7919f109694SAlan Cox struct serial_struct tmp; 7923abe8c76SPeter Hurley 7934047b371SPeter Hurley if (uart_get_info(port, &tmp) < 0) 7944047b371SPeter Hurley return -EIO; 795ab4382d2SGreg Kroah-Hartman 796ab4382d2SGreg Kroah-Hartman if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) 797ab4382d2SGreg Kroah-Hartman return -EFAULT; 798ab4382d2SGreg Kroah-Hartman return 0; 799ab4382d2SGreg Kroah-Hartman } 800ab4382d2SGreg Kroah-Hartman 8017ba2e769SAlan Cox static int uart_set_info(struct tty_struct *tty, struct tty_port *port, 8027ba2e769SAlan Cox struct uart_state *state, 8037ba2e769SAlan Cox struct serial_struct *new_info) 804ab4382d2SGreg Kroah-Hartman { 8054047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 806ab4382d2SGreg Kroah-Hartman unsigned long new_port; 807ab4382d2SGreg Kroah-Hartman unsigned int change_irq, change_port, closing_wait; 808ab4382d2SGreg Kroah-Hartman unsigned int old_custom_divisor, close_delay; 809ab4382d2SGreg Kroah-Hartman upf_t old_flags, new_flags; 810ab4382d2SGreg Kroah-Hartman int retval = 0; 811ab4382d2SGreg Kroah-Hartman 8124047b371SPeter Hurley if (!uport) 8134047b371SPeter Hurley return -EIO; 8144047b371SPeter Hurley 8157ba2e769SAlan Cox new_port = new_info->port; 816ab4382d2SGreg Kroah-Hartman if (HIGH_BITS_OFFSET) 8177ba2e769SAlan Cox new_port += (unsigned long) new_info->port_high << HIGH_BITS_OFFSET; 818ab4382d2SGreg Kroah-Hartman 8197ba2e769SAlan Cox new_info->irq = irq_canonicalize(new_info->irq); 8207ba2e769SAlan Cox close_delay = msecs_to_jiffies(new_info->close_delay * 10); 8217ba2e769SAlan Cox closing_wait = new_info->closing_wait == ASYNC_CLOSING_WAIT_NONE ? 8224cb0fbfdSJiri Slaby ASYNC_CLOSING_WAIT_NONE : 8237ba2e769SAlan Cox msecs_to_jiffies(new_info->closing_wait * 10); 824ab4382d2SGreg Kroah-Hartman 825ab4382d2SGreg Kroah-Hartman 826ab4382d2SGreg Kroah-Hartman change_irq = !(uport->flags & UPF_FIXED_PORT) 8277ba2e769SAlan Cox && new_info->irq != uport->irq; 828ab4382d2SGreg Kroah-Hartman 829ab4382d2SGreg Kroah-Hartman /* 830ab4382d2SGreg Kroah-Hartman * Since changing the 'type' of the port changes its resource 831ab4382d2SGreg Kroah-Hartman * allocations, we should treat type changes the same as 832ab4382d2SGreg Kroah-Hartman * IO port changes. 833ab4382d2SGreg Kroah-Hartman */ 834ab4382d2SGreg Kroah-Hartman change_port = !(uport->flags & UPF_FIXED_PORT) 835ab4382d2SGreg Kroah-Hartman && (new_port != uport->iobase || 8367ba2e769SAlan Cox (unsigned long)new_info->iomem_base != uport->mapbase || 8377ba2e769SAlan Cox new_info->hub6 != uport->hub6 || 8387ba2e769SAlan Cox new_info->io_type != uport->iotype || 8397ba2e769SAlan Cox new_info->iomem_reg_shift != uport->regshift || 8407ba2e769SAlan Cox new_info->type != uport->type); 841ab4382d2SGreg Kroah-Hartman 842ab4382d2SGreg Kroah-Hartman old_flags = uport->flags; 843a17e74c5SAndy Shevchenko new_flags = (__force upf_t)new_info->flags; 844ab4382d2SGreg Kroah-Hartman old_custom_divisor = uport->custom_divisor; 845ab4382d2SGreg Kroah-Hartman 846ab4382d2SGreg Kroah-Hartman if (!capable(CAP_SYS_ADMIN)) { 847ab4382d2SGreg Kroah-Hartman retval = -EPERM; 848ab4382d2SGreg Kroah-Hartman if (change_irq || change_port || 8497ba2e769SAlan Cox (new_info->baud_base != uport->uartclk / 16) || 850ab4382d2SGreg Kroah-Hartman (close_delay != port->close_delay) || 851ab4382d2SGreg Kroah-Hartman (closing_wait != port->closing_wait) || 8527ba2e769SAlan Cox (new_info->xmit_fifo_size && 8537ba2e769SAlan Cox new_info->xmit_fifo_size != uport->fifosize) || 854ab4382d2SGreg Kroah-Hartman (((new_flags ^ old_flags) & ~UPF_USR_MASK) != 0)) 855ab4382d2SGreg Kroah-Hartman goto exit; 856ab4382d2SGreg Kroah-Hartman uport->flags = ((uport->flags & ~UPF_USR_MASK) | 857ab4382d2SGreg Kroah-Hartman (new_flags & UPF_USR_MASK)); 8587ba2e769SAlan Cox uport->custom_divisor = new_info->custom_divisor; 859ab4382d2SGreg Kroah-Hartman goto check_and_exit; 860ab4382d2SGreg Kroah-Hartman } 861ab4382d2SGreg Kroah-Hartman 862ab4382d2SGreg Kroah-Hartman /* 863ab4382d2SGreg Kroah-Hartman * Ask the low level driver to verify the settings. 864ab4382d2SGreg Kroah-Hartman */ 865ab4382d2SGreg Kroah-Hartman if (uport->ops->verify_port) 8667ba2e769SAlan Cox retval = uport->ops->verify_port(uport, new_info); 867ab4382d2SGreg Kroah-Hartman 8687ba2e769SAlan Cox if ((new_info->irq >= nr_irqs) || (new_info->irq < 0) || 8697ba2e769SAlan Cox (new_info->baud_base < 9600)) 870ab4382d2SGreg Kroah-Hartman retval = -EINVAL; 871ab4382d2SGreg Kroah-Hartman 872ab4382d2SGreg Kroah-Hartman if (retval) 873ab4382d2SGreg Kroah-Hartman goto exit; 874ab4382d2SGreg Kroah-Hartman 875ab4382d2SGreg Kroah-Hartman if (change_port || change_irq) { 876ab4382d2SGreg Kroah-Hartman retval = -EBUSY; 877ab4382d2SGreg Kroah-Hartman 878ab4382d2SGreg Kroah-Hartman /* 879ab4382d2SGreg Kroah-Hartman * Make sure that we are the sole user of this port. 880ab4382d2SGreg Kroah-Hartman */ 881ab4382d2SGreg Kroah-Hartman if (tty_port_users(port) > 1) 882ab4382d2SGreg Kroah-Hartman goto exit; 883ab4382d2SGreg Kroah-Hartman 884ab4382d2SGreg Kroah-Hartman /* 885ab4382d2SGreg Kroah-Hartman * We need to shutdown the serial port at the old 886ab4382d2SGreg Kroah-Hartman * port/type/irq combination. 887ab4382d2SGreg Kroah-Hartman */ 888ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 889ab4382d2SGreg Kroah-Hartman } 890ab4382d2SGreg Kroah-Hartman 891ab4382d2SGreg Kroah-Hartman if (change_port) { 892ab4382d2SGreg Kroah-Hartman unsigned long old_iobase, old_mapbase; 893ab4382d2SGreg Kroah-Hartman unsigned int old_type, old_iotype, old_hub6, old_shift; 894ab4382d2SGreg Kroah-Hartman 895ab4382d2SGreg Kroah-Hartman old_iobase = uport->iobase; 896ab4382d2SGreg Kroah-Hartman old_mapbase = uport->mapbase; 897ab4382d2SGreg Kroah-Hartman old_type = uport->type; 898ab4382d2SGreg Kroah-Hartman old_hub6 = uport->hub6; 899ab4382d2SGreg Kroah-Hartman old_iotype = uport->iotype; 900ab4382d2SGreg Kroah-Hartman old_shift = uport->regshift; 901ab4382d2SGreg Kroah-Hartman 902ab4382d2SGreg Kroah-Hartman /* 903ab4382d2SGreg Kroah-Hartman * Free and release old regions 904ab4382d2SGreg Kroah-Hartman */ 905a7cfaf16SFabio Estevam if (old_type != PORT_UNKNOWN && uport->ops->release_port) 906ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 907ab4382d2SGreg Kroah-Hartman 908ab4382d2SGreg Kroah-Hartman uport->iobase = new_port; 9097ba2e769SAlan Cox uport->type = new_info->type; 9107ba2e769SAlan Cox uport->hub6 = new_info->hub6; 9117ba2e769SAlan Cox uport->iotype = new_info->io_type; 9127ba2e769SAlan Cox uport->regshift = new_info->iomem_reg_shift; 9137ba2e769SAlan Cox uport->mapbase = (unsigned long)new_info->iomem_base; 914ab4382d2SGreg Kroah-Hartman 915ab4382d2SGreg Kroah-Hartman /* 916ab4382d2SGreg Kroah-Hartman * Claim and map the new regions 917ab4382d2SGreg Kroah-Hartman */ 918a7cfaf16SFabio Estevam if (uport->type != PORT_UNKNOWN && uport->ops->request_port) { 919ab4382d2SGreg Kroah-Hartman retval = uport->ops->request_port(uport); 920ab4382d2SGreg Kroah-Hartman } else { 921ab4382d2SGreg Kroah-Hartman /* Always success - Jean II */ 922ab4382d2SGreg Kroah-Hartman retval = 0; 923ab4382d2SGreg Kroah-Hartman } 924ab4382d2SGreg Kroah-Hartman 925ab4382d2SGreg Kroah-Hartman /* 926ab4382d2SGreg Kroah-Hartman * If we fail to request resources for the 927ab4382d2SGreg Kroah-Hartman * new port, try to restore the old settings. 928ab4382d2SGreg Kroah-Hartman */ 9297deb39edSThomas Pfaff if (retval) { 930ab4382d2SGreg Kroah-Hartman uport->iobase = old_iobase; 931ab4382d2SGreg Kroah-Hartman uport->type = old_type; 932ab4382d2SGreg Kroah-Hartman uport->hub6 = old_hub6; 933ab4382d2SGreg Kroah-Hartman uport->iotype = old_iotype; 934ab4382d2SGreg Kroah-Hartman uport->regshift = old_shift; 935ab4382d2SGreg Kroah-Hartman uport->mapbase = old_mapbase; 9367deb39edSThomas Pfaff 9377deb39edSThomas Pfaff if (old_type != PORT_UNKNOWN) { 938ab4382d2SGreg Kroah-Hartman retval = uport->ops->request_port(uport); 939ab4382d2SGreg Kroah-Hartman /* 940ab4382d2SGreg Kroah-Hartman * If we failed to restore the old settings, 941ab4382d2SGreg Kroah-Hartman * we fail like this. 942ab4382d2SGreg Kroah-Hartman */ 943ab4382d2SGreg Kroah-Hartman if (retval) 944ab4382d2SGreg Kroah-Hartman uport->type = PORT_UNKNOWN; 945ab4382d2SGreg Kroah-Hartman 946ab4382d2SGreg Kroah-Hartman /* 947ab4382d2SGreg Kroah-Hartman * We failed anyway. 948ab4382d2SGreg Kroah-Hartman */ 949ab4382d2SGreg Kroah-Hartman retval = -EBUSY; 9507deb39edSThomas Pfaff } 9517deb39edSThomas Pfaff 952ab4382d2SGreg Kroah-Hartman /* Added to return the correct error -Ram Gupta */ 953ab4382d2SGreg Kroah-Hartman goto exit; 954ab4382d2SGreg Kroah-Hartman } 955ab4382d2SGreg Kroah-Hartman } 956ab4382d2SGreg Kroah-Hartman 957ab4382d2SGreg Kroah-Hartman if (change_irq) 9587ba2e769SAlan Cox uport->irq = new_info->irq; 959ab4382d2SGreg Kroah-Hartman if (!(uport->flags & UPF_FIXED_PORT)) 9607ba2e769SAlan Cox uport->uartclk = new_info->baud_base * 16; 961ab4382d2SGreg Kroah-Hartman uport->flags = (uport->flags & ~UPF_CHANGE_MASK) | 962ab4382d2SGreg Kroah-Hartman (new_flags & UPF_CHANGE_MASK); 9637ba2e769SAlan Cox uport->custom_divisor = new_info->custom_divisor; 964ab4382d2SGreg Kroah-Hartman port->close_delay = close_delay; 965ab4382d2SGreg Kroah-Hartman port->closing_wait = closing_wait; 9667ba2e769SAlan Cox if (new_info->xmit_fifo_size) 9677ba2e769SAlan Cox uport->fifosize = new_info->xmit_fifo_size; 968d6c53c0eSJiri Slaby port->low_latency = (uport->flags & UPF_LOW_LATENCY) ? 1 : 0; 969ab4382d2SGreg Kroah-Hartman 970ab4382d2SGreg Kroah-Hartman check_and_exit: 971ab4382d2SGreg Kroah-Hartman retval = 0; 972ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) 973ab4382d2SGreg Kroah-Hartman goto exit; 974d41861caSPeter Hurley if (tty_port_initialized(port)) { 975ab4382d2SGreg Kroah-Hartman if (((old_flags ^ uport->flags) & UPF_SPD_MASK) || 976ab4382d2SGreg Kroah-Hartman old_custom_divisor != uport->custom_divisor) { 977ab4382d2SGreg Kroah-Hartman /* 978ab4382d2SGreg Kroah-Hartman * If they're setting up a custom divisor or speed, 979dc2f7271SJohan Hovold * instead of clearing it, then bitch about it. 980ab4382d2SGreg Kroah-Hartman */ 981ab4382d2SGreg Kroah-Hartman if (uport->flags & UPF_SPD_MASK) { 982dc2f7271SJohan Hovold dev_notice_ratelimited(uport->dev, 9832f2dafe7SSudip Mukherjee "%s sets custom speed on %s. This is deprecated.\n", 9842f2dafe7SSudip Mukherjee current->comm, 985429b4749SRasmus Villemoes tty_name(port->tty)); 986ab4382d2SGreg Kroah-Hartman } 987ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 988ab4382d2SGreg Kroah-Hartman } 989b3b57646SRob Herring } else { 990ab4382d2SGreg Kroah-Hartman retval = uart_startup(tty, state, 1); 991b3b57646SRob Herring if (retval > 0) 992b3b57646SRob Herring retval = 0; 993b3b57646SRob Herring } 994ab4382d2SGreg Kroah-Hartman exit: 9957ba2e769SAlan Cox return retval; 9967ba2e769SAlan Cox } 9977ba2e769SAlan Cox 9987ba2e769SAlan Cox static int uart_set_info_user(struct tty_struct *tty, struct uart_state *state, 9997ba2e769SAlan Cox struct serial_struct __user *newinfo) 10007ba2e769SAlan Cox { 10017ba2e769SAlan Cox struct serial_struct new_serial; 10027ba2e769SAlan Cox struct tty_port *port = &state->port; 10037ba2e769SAlan Cox int retval; 10047ba2e769SAlan Cox 10057ba2e769SAlan Cox if (copy_from_user(&new_serial, newinfo, sizeof(new_serial))) 10067ba2e769SAlan Cox return -EFAULT; 10077ba2e769SAlan Cox 10087ba2e769SAlan Cox /* 10097ba2e769SAlan Cox * This semaphore protects port->count. It is also 10107ba2e769SAlan Cox * very useful to prevent opens. Also, take the 10117ba2e769SAlan Cox * port configuration semaphore to make sure that a 10127ba2e769SAlan Cox * module insertion/removal doesn't change anything 10137ba2e769SAlan Cox * under us. 10147ba2e769SAlan Cox */ 10157ba2e769SAlan Cox mutex_lock(&port->mutex); 10167ba2e769SAlan Cox retval = uart_set_info(tty, port, state, &new_serial); 1017ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1018ab4382d2SGreg Kroah-Hartman return retval; 1019ab4382d2SGreg Kroah-Hartman } 1020ab4382d2SGreg Kroah-Hartman 1021ab4382d2SGreg Kroah-Hartman /** 1022ab4382d2SGreg Kroah-Hartman * uart_get_lsr_info - get line status register info 1023ab4382d2SGreg Kroah-Hartman * @tty: tty associated with the UART 1024ab4382d2SGreg Kroah-Hartman * @state: UART being queried 1025ab4382d2SGreg Kroah-Hartman * @value: returned modem value 1026ab4382d2SGreg Kroah-Hartman */ 1027ab4382d2SGreg Kroah-Hartman static int uart_get_lsr_info(struct tty_struct *tty, 1028ab4382d2SGreg Kroah-Hartman struct uart_state *state, unsigned int __user *value) 1029ab4382d2SGreg Kroah-Hartman { 10304047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 1031ab4382d2SGreg Kroah-Hartman unsigned int result; 1032ab4382d2SGreg Kroah-Hartman 1033ab4382d2SGreg Kroah-Hartman result = uport->ops->tx_empty(uport); 1034ab4382d2SGreg Kroah-Hartman 1035ab4382d2SGreg Kroah-Hartman /* 1036ab4382d2SGreg Kroah-Hartman * If we're about to load something into the transmit 1037ab4382d2SGreg Kroah-Hartman * register, we'll pretend the transmitter isn't empty to 1038ab4382d2SGreg Kroah-Hartman * avoid a race condition (depending on when the transmit 1039ab4382d2SGreg Kroah-Hartman * interrupt happens). 1040ab4382d2SGreg Kroah-Hartman */ 1041ab4382d2SGreg Kroah-Hartman if (uport->x_char || 1042ab4382d2SGreg Kroah-Hartman ((uart_circ_chars_pending(&state->xmit) > 0) && 1043d01f4d18SPeter Hurley !uart_tx_stopped(uport))) 1044ab4382d2SGreg Kroah-Hartman result &= ~TIOCSER_TEMT; 1045ab4382d2SGreg Kroah-Hartman 1046ab4382d2SGreg Kroah-Hartman return put_user(result, value); 1047ab4382d2SGreg Kroah-Hartman } 1048ab4382d2SGreg Kroah-Hartman 104960b33c13SAlan Cox static int uart_tiocmget(struct tty_struct *tty) 1050ab4382d2SGreg Kroah-Hartman { 1051ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1052ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 10534047b371SPeter Hurley struct uart_port *uport; 1054ab4382d2SGreg Kroah-Hartman int result = -EIO; 1055ab4382d2SGreg Kroah-Hartman 1056ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 10574047b371SPeter Hurley uport = uart_port_check(state); 10584047b371SPeter Hurley if (!uport) 10594047b371SPeter Hurley goto out; 10604047b371SPeter Hurley 106118900ca6SPeter Hurley if (!tty_io_error(tty)) { 1062ab4382d2SGreg Kroah-Hartman result = uport->mctrl; 1063ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1064ab4382d2SGreg Kroah-Hartman result |= uport->ops->get_mctrl(uport); 1065ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1066ab4382d2SGreg Kroah-Hartman } 10674047b371SPeter Hurley out: 1068ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1069ab4382d2SGreg Kroah-Hartman return result; 1070ab4382d2SGreg Kroah-Hartman } 1071ab4382d2SGreg Kroah-Hartman 1072ab4382d2SGreg Kroah-Hartman static int 107320b9d177SAlan Cox uart_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear) 1074ab4382d2SGreg Kroah-Hartman { 1075ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1076ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 10774047b371SPeter Hurley struct uart_port *uport; 1078ab4382d2SGreg Kroah-Hartman int ret = -EIO; 1079ab4382d2SGreg Kroah-Hartman 1080ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 10814047b371SPeter Hurley uport = uart_port_check(state); 10824047b371SPeter Hurley if (!uport) 10834047b371SPeter Hurley goto out; 10844047b371SPeter Hurley 108518900ca6SPeter Hurley if (!tty_io_error(tty)) { 1086ab4382d2SGreg Kroah-Hartman uart_update_mctrl(uport, set, clear); 1087ab4382d2SGreg Kroah-Hartman ret = 0; 1088ab4382d2SGreg Kroah-Hartman } 10894047b371SPeter Hurley out: 1090ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1091ab4382d2SGreg Kroah-Hartman return ret; 1092ab4382d2SGreg Kroah-Hartman } 1093ab4382d2SGreg Kroah-Hartman 1094ab4382d2SGreg Kroah-Hartman static int uart_break_ctl(struct tty_struct *tty, int break_state) 1095ab4382d2SGreg Kroah-Hartman { 1096ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1097ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 10984047b371SPeter Hurley struct uart_port *uport; 10994047b371SPeter Hurley int ret = -EIO; 1100ab4382d2SGreg Kroah-Hartman 1101ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 11024047b371SPeter Hurley uport = uart_port_check(state); 11034047b371SPeter Hurley if (!uport) 11044047b371SPeter Hurley goto out; 1105ab4382d2SGreg Kroah-Hartman 1106ab4382d2SGreg Kroah-Hartman if (uport->type != PORT_UNKNOWN) 1107ab4382d2SGreg Kroah-Hartman uport->ops->break_ctl(uport, break_state); 11084047b371SPeter Hurley ret = 0; 11094047b371SPeter Hurley out: 1110ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 11114047b371SPeter Hurley return ret; 1112ab4382d2SGreg Kroah-Hartman } 1113ab4382d2SGreg Kroah-Hartman 1114ab4382d2SGreg Kroah-Hartman static int uart_do_autoconfig(struct tty_struct *tty,struct uart_state *state) 1115ab4382d2SGreg Kroah-Hartman { 1116ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 11174047b371SPeter Hurley struct uart_port *uport; 1118ab4382d2SGreg Kroah-Hartman int flags, ret; 1119ab4382d2SGreg Kroah-Hartman 1120ab4382d2SGreg Kroah-Hartman if (!capable(CAP_SYS_ADMIN)) 1121ab4382d2SGreg Kroah-Hartman return -EPERM; 1122ab4382d2SGreg Kroah-Hartman 1123ab4382d2SGreg Kroah-Hartman /* 1124ab4382d2SGreg Kroah-Hartman * Take the per-port semaphore. This prevents count from 1125ab4382d2SGreg Kroah-Hartman * changing, and hence any extra opens of the port while 1126ab4382d2SGreg Kroah-Hartman * we're auto-configuring. 1127ab4382d2SGreg Kroah-Hartman */ 1128ab4382d2SGreg Kroah-Hartman if (mutex_lock_interruptible(&port->mutex)) 1129ab4382d2SGreg Kroah-Hartman return -ERESTARTSYS; 1130ab4382d2SGreg Kroah-Hartman 11314047b371SPeter Hurley uport = uart_port_check(state); 11324047b371SPeter Hurley if (!uport) { 11334047b371SPeter Hurley ret = -EIO; 11344047b371SPeter Hurley goto out; 11354047b371SPeter Hurley } 11364047b371SPeter Hurley 1137ab4382d2SGreg Kroah-Hartman ret = -EBUSY; 1138ab4382d2SGreg Kroah-Hartman if (tty_port_users(port) == 1) { 1139ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 1140ab4382d2SGreg Kroah-Hartman 1141ab4382d2SGreg Kroah-Hartman /* 1142ab4382d2SGreg Kroah-Hartman * If we already have a port type configured, 1143ab4382d2SGreg Kroah-Hartman * we must release its resources. 1144ab4382d2SGreg Kroah-Hartman */ 1145a7cfaf16SFabio Estevam if (uport->type != PORT_UNKNOWN && uport->ops->release_port) 1146ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 1147ab4382d2SGreg Kroah-Hartman 1148ab4382d2SGreg Kroah-Hartman flags = UART_CONFIG_TYPE; 1149ab4382d2SGreg Kroah-Hartman if (uport->flags & UPF_AUTO_IRQ) 1150ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_IRQ; 1151ab4382d2SGreg Kroah-Hartman 1152ab4382d2SGreg Kroah-Hartman /* 1153ab4382d2SGreg Kroah-Hartman * This will claim the ports resources if 1154ab4382d2SGreg Kroah-Hartman * a port is found. 1155ab4382d2SGreg Kroah-Hartman */ 1156ab4382d2SGreg Kroah-Hartman uport->ops->config_port(uport, flags); 1157ab4382d2SGreg Kroah-Hartman 1158ab4382d2SGreg Kroah-Hartman ret = uart_startup(tty, state, 1); 1159b3b57646SRob Herring if (ret > 0) 1160b3b57646SRob Herring ret = 0; 1161ab4382d2SGreg Kroah-Hartman } 11624047b371SPeter Hurley out: 1163ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1164ab4382d2SGreg Kroah-Hartman return ret; 1165ab4382d2SGreg Kroah-Hartman } 1166ab4382d2SGreg Kroah-Hartman 11671fdc3106SAlexander Shiyan static void uart_enable_ms(struct uart_port *uport) 11681fdc3106SAlexander Shiyan { 11691fdc3106SAlexander Shiyan /* 11701fdc3106SAlexander Shiyan * Force modem status interrupts on 11711fdc3106SAlexander Shiyan */ 11721fdc3106SAlexander Shiyan if (uport->ops->enable_ms) 11731fdc3106SAlexander Shiyan uport->ops->enable_ms(uport); 11741fdc3106SAlexander Shiyan } 11751fdc3106SAlexander Shiyan 1176ab4382d2SGreg Kroah-Hartman /* 1177ab4382d2SGreg Kroah-Hartman * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change 1178ab4382d2SGreg Kroah-Hartman * - mask passed in arg for lines of interest 1179ab4382d2SGreg Kroah-Hartman * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) 1180ab4382d2SGreg Kroah-Hartman * Caller should use TIOCGICOUNT to see which one it was 1181ab4382d2SGreg Kroah-Hartman * 1182ab4382d2SGreg Kroah-Hartman * FIXME: This wants extracting into a common all driver implementation 1183ab4382d2SGreg Kroah-Hartman * of TIOCMWAIT using tty_port. 1184ab4382d2SGreg Kroah-Hartman */ 11859ed19428SPeter Hurley static int uart_wait_modem_status(struct uart_state *state, unsigned long arg) 1186ab4382d2SGreg Kroah-Hartman { 11879ed19428SPeter Hurley struct uart_port *uport; 1188ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1189ab4382d2SGreg Kroah-Hartman DECLARE_WAITQUEUE(wait, current); 1190ab4382d2SGreg Kroah-Hartman struct uart_icount cprev, cnow; 1191ab4382d2SGreg Kroah-Hartman int ret; 1192ab4382d2SGreg Kroah-Hartman 1193ab4382d2SGreg Kroah-Hartman /* 1194ab4382d2SGreg Kroah-Hartman * note the counters on entry 1195ab4382d2SGreg Kroah-Hartman */ 11969ed19428SPeter Hurley uport = uart_port_ref(state); 11979ed19428SPeter Hurley if (!uport) 11989ed19428SPeter Hurley return -EIO; 1199ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1200ab4382d2SGreg Kroah-Hartman memcpy(&cprev, &uport->icount, sizeof(struct uart_icount)); 12011fdc3106SAlexander Shiyan uart_enable_ms(uport); 1202ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1203ab4382d2SGreg Kroah-Hartman 1204ab4382d2SGreg Kroah-Hartman add_wait_queue(&port->delta_msr_wait, &wait); 1205ab4382d2SGreg Kroah-Hartman for (;;) { 1206ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1207ab4382d2SGreg Kroah-Hartman memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); 1208ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1209ab4382d2SGreg Kroah-Hartman 1210ab4382d2SGreg Kroah-Hartman set_current_state(TASK_INTERRUPTIBLE); 1211ab4382d2SGreg Kroah-Hartman 1212ab4382d2SGreg Kroah-Hartman if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || 1213ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || 1214ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || 1215ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) { 1216ab4382d2SGreg Kroah-Hartman ret = 0; 1217ab4382d2SGreg Kroah-Hartman break; 1218ab4382d2SGreg Kroah-Hartman } 1219ab4382d2SGreg Kroah-Hartman 1220ab4382d2SGreg Kroah-Hartman schedule(); 1221ab4382d2SGreg Kroah-Hartman 1222ab4382d2SGreg Kroah-Hartman /* see if a signal did it */ 1223ab4382d2SGreg Kroah-Hartman if (signal_pending(current)) { 1224ab4382d2SGreg Kroah-Hartman ret = -ERESTARTSYS; 1225ab4382d2SGreg Kroah-Hartman break; 1226ab4382d2SGreg Kroah-Hartman } 1227ab4382d2SGreg Kroah-Hartman 1228ab4382d2SGreg Kroah-Hartman cprev = cnow; 1229ab4382d2SGreg Kroah-Hartman } 123097f9f707SFabian Frederick __set_current_state(TASK_RUNNING); 1231ab4382d2SGreg Kroah-Hartman remove_wait_queue(&port->delta_msr_wait, &wait); 12329ed19428SPeter Hurley uart_port_deref(uport); 1233ab4382d2SGreg Kroah-Hartman 1234ab4382d2SGreg Kroah-Hartman return ret; 1235ab4382d2SGreg Kroah-Hartman } 1236ab4382d2SGreg Kroah-Hartman 1237ab4382d2SGreg Kroah-Hartman /* 1238ab4382d2SGreg Kroah-Hartman * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) 1239ab4382d2SGreg Kroah-Hartman * Return: write counters to the user passed counter struct 1240ab4382d2SGreg Kroah-Hartman * NB: both 1->0 and 0->1 transitions are counted except for 1241ab4382d2SGreg Kroah-Hartman * RI where only 0->1 is counted. 1242ab4382d2SGreg Kroah-Hartman */ 1243ab4382d2SGreg Kroah-Hartman static int uart_get_icount(struct tty_struct *tty, 1244ab4382d2SGreg Kroah-Hartman struct serial_icounter_struct *icount) 1245ab4382d2SGreg Kroah-Hartman { 1246ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1247ab4382d2SGreg Kroah-Hartman struct uart_icount cnow; 12489ed19428SPeter Hurley struct uart_port *uport; 1249ab4382d2SGreg Kroah-Hartman 12509ed19428SPeter Hurley uport = uart_port_ref(state); 12519ed19428SPeter Hurley if (!uport) 12529ed19428SPeter Hurley return -EIO; 1253ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1254ab4382d2SGreg Kroah-Hartman memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); 1255ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 12569ed19428SPeter Hurley uart_port_deref(uport); 1257ab4382d2SGreg Kroah-Hartman 1258ab4382d2SGreg Kroah-Hartman icount->cts = cnow.cts; 1259ab4382d2SGreg Kroah-Hartman icount->dsr = cnow.dsr; 1260ab4382d2SGreg Kroah-Hartman icount->rng = cnow.rng; 1261ab4382d2SGreg Kroah-Hartman icount->dcd = cnow.dcd; 1262ab4382d2SGreg Kroah-Hartman icount->rx = cnow.rx; 1263ab4382d2SGreg Kroah-Hartman icount->tx = cnow.tx; 1264ab4382d2SGreg Kroah-Hartman icount->frame = cnow.frame; 1265ab4382d2SGreg Kroah-Hartman icount->overrun = cnow.overrun; 1266ab4382d2SGreg Kroah-Hartman icount->parity = cnow.parity; 1267ab4382d2SGreg Kroah-Hartman icount->brk = cnow.brk; 1268ab4382d2SGreg Kroah-Hartman icount->buf_overrun = cnow.buf_overrun; 1269ab4382d2SGreg Kroah-Hartman 1270ab4382d2SGreg Kroah-Hartman return 0; 1271ab4382d2SGreg Kroah-Hartman } 1272ab4382d2SGreg Kroah-Hartman 1273a5f276f1SRicardo Ribalda Delgado static int uart_get_rs485_config(struct uart_port *port, 1274a5f276f1SRicardo Ribalda Delgado struct serial_rs485 __user *rs485) 1275a5f276f1SRicardo Ribalda Delgado { 1276bd737f87SRicardo Ribalda Delgado unsigned long flags; 1277bd737f87SRicardo Ribalda Delgado struct serial_rs485 aux; 1278bd737f87SRicardo Ribalda Delgado 1279bd737f87SRicardo Ribalda Delgado spin_lock_irqsave(&port->lock, flags); 1280bd737f87SRicardo Ribalda Delgado aux = port->rs485; 1281bd737f87SRicardo Ribalda Delgado spin_unlock_irqrestore(&port->lock, flags); 1282bd737f87SRicardo Ribalda Delgado 1283bd737f87SRicardo Ribalda Delgado if (copy_to_user(rs485, &aux, sizeof(aux))) 1284a5f276f1SRicardo Ribalda Delgado return -EFAULT; 1285bd737f87SRicardo Ribalda Delgado 1286a5f276f1SRicardo Ribalda Delgado return 0; 1287a5f276f1SRicardo Ribalda Delgado } 1288a5f276f1SRicardo Ribalda Delgado 1289a5f276f1SRicardo Ribalda Delgado static int uart_set_rs485_config(struct uart_port *port, 1290a5f276f1SRicardo Ribalda Delgado struct serial_rs485 __user *rs485_user) 1291a5f276f1SRicardo Ribalda Delgado { 1292a5f276f1SRicardo Ribalda Delgado struct serial_rs485 rs485; 1293a5f276f1SRicardo Ribalda Delgado int ret; 1294bd737f87SRicardo Ribalda Delgado unsigned long flags; 1295a5f276f1SRicardo Ribalda Delgado 1296a5f276f1SRicardo Ribalda Delgado if (!port->rs485_config) 1297a5f276f1SRicardo Ribalda Delgado return -ENOIOCTLCMD; 1298a5f276f1SRicardo Ribalda Delgado 1299a5f276f1SRicardo Ribalda Delgado if (copy_from_user(&rs485, rs485_user, sizeof(*rs485_user))) 1300a5f276f1SRicardo Ribalda Delgado return -EFAULT; 1301a5f276f1SRicardo Ribalda Delgado 1302bd737f87SRicardo Ribalda Delgado spin_lock_irqsave(&port->lock, flags); 1303a5f276f1SRicardo Ribalda Delgado ret = port->rs485_config(port, &rs485); 1304bd737f87SRicardo Ribalda Delgado spin_unlock_irqrestore(&port->lock, flags); 1305a5f276f1SRicardo Ribalda Delgado if (ret) 1306a5f276f1SRicardo Ribalda Delgado return ret; 1307a5f276f1SRicardo Ribalda Delgado 1308a5f276f1SRicardo Ribalda Delgado if (copy_to_user(rs485_user, &port->rs485, sizeof(port->rs485))) 1309a5f276f1SRicardo Ribalda Delgado return -EFAULT; 1310a5f276f1SRicardo Ribalda Delgado 1311a5f276f1SRicardo Ribalda Delgado return 0; 1312a5f276f1SRicardo Ribalda Delgado } 1313a5f276f1SRicardo Ribalda Delgado 1314ab4382d2SGreg Kroah-Hartman /* 1315ab4382d2SGreg Kroah-Hartman * Called via sys_ioctl. We can use spin_lock_irq() here. 1316ab4382d2SGreg Kroah-Hartman */ 1317ab4382d2SGreg Kroah-Hartman static int 13184047b371SPeter Hurley uart_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg) 1319ab4382d2SGreg Kroah-Hartman { 1320ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1321ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 13224047b371SPeter Hurley struct uart_port *uport; 1323ab4382d2SGreg Kroah-Hartman void __user *uarg = (void __user *)arg; 1324ab4382d2SGreg Kroah-Hartman int ret = -ENOIOCTLCMD; 1325ab4382d2SGreg Kroah-Hartman 1326ab4382d2SGreg Kroah-Hartman 1327ab4382d2SGreg Kroah-Hartman /* 1328ab4382d2SGreg Kroah-Hartman * These ioctls don't rely on the hardware to be present. 1329ab4382d2SGreg Kroah-Hartman */ 1330ab4382d2SGreg Kroah-Hartman switch (cmd) { 1331ab4382d2SGreg Kroah-Hartman case TIOCGSERIAL: 13329f109694SAlan Cox ret = uart_get_info_user(port, uarg); 1333ab4382d2SGreg Kroah-Hartman break; 1334ab4382d2SGreg Kroah-Hartman 1335ab4382d2SGreg Kroah-Hartman case TIOCSSERIAL: 13367c8ab967SPeter Hurley down_write(&tty->termios_rwsem); 13377ba2e769SAlan Cox ret = uart_set_info_user(tty, state, uarg); 13387c8ab967SPeter Hurley up_write(&tty->termios_rwsem); 1339ab4382d2SGreg Kroah-Hartman break; 1340ab4382d2SGreg Kroah-Hartman 1341ab4382d2SGreg Kroah-Hartman case TIOCSERCONFIG: 13427c8ab967SPeter Hurley down_write(&tty->termios_rwsem); 1343ab4382d2SGreg Kroah-Hartman ret = uart_do_autoconfig(tty, state); 13447c8ab967SPeter Hurley up_write(&tty->termios_rwsem); 1345ab4382d2SGreg Kroah-Hartman break; 1346ab4382d2SGreg Kroah-Hartman 1347ab4382d2SGreg Kroah-Hartman case TIOCSERGWILD: /* obsolete */ 1348ab4382d2SGreg Kroah-Hartman case TIOCSERSWILD: /* obsolete */ 1349ab4382d2SGreg Kroah-Hartman ret = 0; 1350ab4382d2SGreg Kroah-Hartman break; 1351ab4382d2SGreg Kroah-Hartman } 1352ab4382d2SGreg Kroah-Hartman 1353ab4382d2SGreg Kroah-Hartman if (ret != -ENOIOCTLCMD) 1354ab4382d2SGreg Kroah-Hartman goto out; 1355ab4382d2SGreg Kroah-Hartman 135618900ca6SPeter Hurley if (tty_io_error(tty)) { 1357ab4382d2SGreg Kroah-Hartman ret = -EIO; 1358ab4382d2SGreg Kroah-Hartman goto out; 1359ab4382d2SGreg Kroah-Hartman } 1360ab4382d2SGreg Kroah-Hartman 1361ab4382d2SGreg Kroah-Hartman /* 1362ab4382d2SGreg Kroah-Hartman * The following should only be used when hardware is present. 1363ab4382d2SGreg Kroah-Hartman */ 1364ab4382d2SGreg Kroah-Hartman switch (cmd) { 1365ab4382d2SGreg Kroah-Hartman case TIOCMIWAIT: 1366ab4382d2SGreg Kroah-Hartman ret = uart_wait_modem_status(state, arg); 1367ab4382d2SGreg Kroah-Hartman break; 1368ab4382d2SGreg Kroah-Hartman } 1369ab4382d2SGreg Kroah-Hartman 1370ab4382d2SGreg Kroah-Hartman if (ret != -ENOIOCTLCMD) 1371ab4382d2SGreg Kroah-Hartman goto out; 1372ab4382d2SGreg Kroah-Hartman 1373ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 13744047b371SPeter Hurley uport = uart_port_check(state); 1375ab4382d2SGreg Kroah-Hartman 13764047b371SPeter Hurley if (!uport || tty_io_error(tty)) { 1377ab4382d2SGreg Kroah-Hartman ret = -EIO; 1378ab4382d2SGreg Kroah-Hartman goto out_up; 1379ab4382d2SGreg Kroah-Hartman } 1380ab4382d2SGreg Kroah-Hartman 1381ab4382d2SGreg Kroah-Hartman /* 1382ab4382d2SGreg Kroah-Hartman * All these rely on hardware being present and need to be 1383ab4382d2SGreg Kroah-Hartman * protected against the tty being hung up. 1384ab4382d2SGreg Kroah-Hartman */ 1385a9c20a9cSRicardo Ribalda Delgado 1386ab4382d2SGreg Kroah-Hartman switch (cmd) { 1387a9c20a9cSRicardo Ribalda Delgado case TIOCSERGETLSR: /* Get line status register */ 1388a9c20a9cSRicardo Ribalda Delgado ret = uart_get_lsr_info(tty, state, uarg); 1389a9c20a9cSRicardo Ribalda Delgado break; 1390a9c20a9cSRicardo Ribalda Delgado 1391a5f276f1SRicardo Ribalda Delgado case TIOCGRS485: 13924047b371SPeter Hurley ret = uart_get_rs485_config(uport, uarg); 1393a5f276f1SRicardo Ribalda Delgado break; 1394a5f276f1SRicardo Ribalda Delgado 1395a5f276f1SRicardo Ribalda Delgado case TIOCSRS485: 13964047b371SPeter Hurley ret = uart_set_rs485_config(uport, uarg); 1397a5f276f1SRicardo Ribalda Delgado break; 13984047b371SPeter Hurley default: 1399ab4382d2SGreg Kroah-Hartman if (uport->ops->ioctl) 1400ab4382d2SGreg Kroah-Hartman ret = uport->ops->ioctl(uport, cmd, arg); 1401ab4382d2SGreg Kroah-Hartman break; 1402ab4382d2SGreg Kroah-Hartman } 1403ab4382d2SGreg Kroah-Hartman out_up: 1404ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1405ab4382d2SGreg Kroah-Hartman out: 1406ab4382d2SGreg Kroah-Hartman return ret; 1407ab4382d2SGreg Kroah-Hartman } 1408ab4382d2SGreg Kroah-Hartman 1409ab4382d2SGreg Kroah-Hartman static void uart_set_ldisc(struct tty_struct *tty) 1410ab4382d2SGreg Kroah-Hartman { 1411ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 14124047b371SPeter Hurley struct uart_port *uport; 1413ab4382d2SGreg Kroah-Hartman 1414db1b9dfcSPeter Hurley mutex_lock(&state->port.mutex); 14154047b371SPeter Hurley uport = uart_port_check(state); 14164047b371SPeter Hurley if (uport && uport->ops->set_ldisc) 1417732a84a0SPeter Hurley uport->ops->set_ldisc(uport, &tty->termios); 1418db1b9dfcSPeter Hurley mutex_unlock(&state->port.mutex); 1419db1b9dfcSPeter Hurley } 1420ab4382d2SGreg Kroah-Hartman 1421ab4382d2SGreg Kroah-Hartman static void uart_set_termios(struct tty_struct *tty, 1422ab4382d2SGreg Kroah-Hartman struct ktermios *old_termios) 1423ab4382d2SGreg Kroah-Hartman { 1424ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 14254047b371SPeter Hurley struct uart_port *uport; 1426adc8d746SAlan Cox unsigned int cflag = tty->termios.c_cflag; 14272cbacafdSRussell King unsigned int iflag_mask = IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK; 14282cbacafdSRussell King bool sw_changed = false; 1429ab4382d2SGreg Kroah-Hartman 14304047b371SPeter Hurley mutex_lock(&state->port.mutex); 14314047b371SPeter Hurley uport = uart_port_check(state); 14324047b371SPeter Hurley if (!uport) 14334047b371SPeter Hurley goto out; 14344047b371SPeter Hurley 14352cbacafdSRussell King /* 14362cbacafdSRussell King * Drivers doing software flow control also need to know 14372cbacafdSRussell King * about changes to these input settings. 14382cbacafdSRussell King */ 14392cbacafdSRussell King if (uport->flags & UPF_SOFT_FLOW) { 14402cbacafdSRussell King iflag_mask |= IXANY|IXON|IXOFF; 14412cbacafdSRussell King sw_changed = 14422cbacafdSRussell King tty->termios.c_cc[VSTART] != old_termios->c_cc[VSTART] || 14432cbacafdSRussell King tty->termios.c_cc[VSTOP] != old_termios->c_cc[VSTOP]; 14442cbacafdSRussell King } 1445ab4382d2SGreg Kroah-Hartman 1446ab4382d2SGreg Kroah-Hartman /* 1447ab4382d2SGreg Kroah-Hartman * These are the bits that are used to setup various 1448ab4382d2SGreg Kroah-Hartman * flags in the low level driver. We can ignore the Bfoo 1449ab4382d2SGreg Kroah-Hartman * bits in c_cflag; c_[io]speed will always be set 1450ab4382d2SGreg Kroah-Hartman * appropriately by set_termios() in tty_ioctl.c 1451ab4382d2SGreg Kroah-Hartman */ 1452ab4382d2SGreg Kroah-Hartman if ((cflag ^ old_termios->c_cflag) == 0 && 1453adc8d746SAlan Cox tty->termios.c_ospeed == old_termios->c_ospeed && 1454adc8d746SAlan Cox tty->termios.c_ispeed == old_termios->c_ispeed && 14552cbacafdSRussell King ((tty->termios.c_iflag ^ old_termios->c_iflag) & iflag_mask) == 0 && 14562cbacafdSRussell King !sw_changed) { 14574047b371SPeter Hurley goto out; 1458ab4382d2SGreg Kroah-Hartman } 1459ab4382d2SGreg Kroah-Hartman 1460ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, old_termios); 1461c18b55fdSPeter Hurley /* reload cflag from termios; port driver may have overriden flags */ 1462c18b55fdSPeter Hurley cflag = tty->termios.c_cflag; 1463ab4382d2SGreg Kroah-Hartman 1464ab4382d2SGreg Kroah-Hartman /* Handle transition to B0 status */ 1465ab4382d2SGreg Kroah-Hartman if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) 1466dec94e70SRussell King uart_clear_mctrl(uport, TIOCM_RTS | TIOCM_DTR); 1467ab4382d2SGreg Kroah-Hartman /* Handle transition away from B0 status */ 1468ab4382d2SGreg Kroah-Hartman else if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { 1469ab4382d2SGreg Kroah-Hartman unsigned int mask = TIOCM_DTR; 147097ef38b8SPeter Hurley if (!(cflag & CRTSCTS) || !tty_throttled(tty)) 1471ab4382d2SGreg Kroah-Hartman mask |= TIOCM_RTS; 1472dec94e70SRussell King uart_set_mctrl(uport, mask); 1473ab4382d2SGreg Kroah-Hartman } 14744047b371SPeter Hurley out: 14754047b371SPeter Hurley mutex_unlock(&state->port.mutex); 1476ab4382d2SGreg Kroah-Hartman } 1477ab4382d2SGreg Kroah-Hartman 1478ab4382d2SGreg Kroah-Hartman /* 1479ef4f527cSKevin Cernekee * Calls to uart_close() are serialised via the tty_lock in 1480ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:tty_release() 1481ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:do_tty_hangup() 1482ab4382d2SGreg Kroah-Hartman */ 1483ab4382d2SGreg Kroah-Hartman static void uart_close(struct tty_struct *tty, struct file *filp) 1484ab4382d2SGreg Kroah-Hartman { 1485ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1486ab4382d2SGreg Kroah-Hartman 148791b32f54SPeter Hurley if (!state) { 148891b32f54SPeter Hurley struct uart_driver *drv = tty->driver->driver_state; 14899356335fSColin Ian King struct tty_port *port; 149091b32f54SPeter Hurley 149191b32f54SPeter Hurley state = drv->state + tty->index; 149291b32f54SPeter Hurley port = &state->port; 149391b32f54SPeter Hurley spin_lock_irq(&port->lock); 149491b32f54SPeter Hurley --port->count; 149591b32f54SPeter Hurley spin_unlock_irq(&port->lock); 1496ab4382d2SGreg Kroah-Hartman return; 149791b32f54SPeter Hurley } 1498ab4382d2SGreg Kroah-Hartman 149939b3d892SPeter Hurley pr_debug("uart_close(%d) called\n", tty->index); 1500ab4382d2SGreg Kroah-Hartman 1501761ed4a9SRob Herring tty_port_close(tty->port, tty, filp); 1502761ed4a9SRob Herring } 1503ab4382d2SGreg Kroah-Hartman 1504761ed4a9SRob Herring static void uart_tty_port_shutdown(struct tty_port *port) 1505761ed4a9SRob Herring { 1506761ed4a9SRob Herring struct uart_state *state = container_of(port, struct uart_state, port); 1507761ed4a9SRob Herring struct uart_port *uport = uart_port_check(state); 1508af224ca2SPeter Hurley 1509ab4382d2SGreg Kroah-Hartman /* 1510ab4382d2SGreg Kroah-Hartman * At this point, we stop accepting input. To do this, we 1511ab4382d2SGreg Kroah-Hartman * disable the receive line status interrupts. 1512ab4382d2SGreg Kroah-Hartman */ 1513a5a2b130SAndy Shevchenko if (WARN(!uport, "detached port still initialized!\n")) 1514a5a2b130SAndy Shevchenko return; 1515761ed4a9SRob Herring 1516a5a2b130SAndy Shevchenko spin_lock_irq(&uport->lock); 1517ab4382d2SGreg Kroah-Hartman uport->ops->stop_rx(uport); 15186fb98fb3SPeter Hurley spin_unlock_irq(&uport->lock); 1519761ed4a9SRob Herring 1520761ed4a9SRob Herring uart_port_shutdown(port); 1521761ed4a9SRob Herring 1522ab4382d2SGreg Kroah-Hartman /* 1523761ed4a9SRob Herring * It's possible for shutdown to be called after suspend if we get 1524761ed4a9SRob Herring * a DCD drop (hangup) at just the right time. Clear suspended bit so 1525761ed4a9SRob Herring * we don't try to resume a port that has been shutdown. 1526ab4382d2SGreg Kroah-Hartman */ 1527761ed4a9SRob Herring tty_port_set_suspended(port, 0); 1528ab4382d2SGreg Kroah-Hartman 15296f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_OFF); 1530ab4382d2SGreg Kroah-Hartman 1531ab4382d2SGreg Kroah-Hartman } 1532ab4382d2SGreg Kroah-Hartman 15331f33a51dSJiri Slaby static void uart_wait_until_sent(struct tty_struct *tty, int timeout) 1534ab4382d2SGreg Kroah-Hartman { 15351f33a51dSJiri Slaby struct uart_state *state = tty->driver_data; 15369ed19428SPeter Hurley struct uart_port *port; 1537ab4382d2SGreg Kroah-Hartman unsigned long char_time, expire; 1538ab4382d2SGreg Kroah-Hartman 15399ed19428SPeter Hurley port = uart_port_ref(state); 1540ef510beaSAndy Shevchenko if (!port) 1541ef510beaSAndy Shevchenko return; 1542ef510beaSAndy Shevchenko 1543ef510beaSAndy Shevchenko if (port->type == PORT_UNKNOWN || port->fifosize == 0) { 15449ed19428SPeter Hurley uart_port_deref(port); 1545ab4382d2SGreg Kroah-Hartman return; 15469ed19428SPeter Hurley } 1547ab4382d2SGreg Kroah-Hartman 1548ab4382d2SGreg Kroah-Hartman /* 1549ab4382d2SGreg Kroah-Hartman * Set the check interval to be 1/5 of the estimated time to 1550ab4382d2SGreg Kroah-Hartman * send a single character, and make it at least 1. The check 1551ab4382d2SGreg Kroah-Hartman * interval should also be less than the timeout. 1552ab4382d2SGreg Kroah-Hartman * 1553ab4382d2SGreg Kroah-Hartman * Note: we have to use pretty tight timings here to satisfy 1554ab4382d2SGreg Kroah-Hartman * the NIST-PCTS. 1555ab4382d2SGreg Kroah-Hartman */ 1556ab4382d2SGreg Kroah-Hartman char_time = (port->timeout - HZ/50) / port->fifosize; 1557ab4382d2SGreg Kroah-Hartman char_time = char_time / 5; 1558ab4382d2SGreg Kroah-Hartman if (char_time == 0) 1559ab4382d2SGreg Kroah-Hartman char_time = 1; 1560ab4382d2SGreg Kroah-Hartman if (timeout && timeout < char_time) 1561ab4382d2SGreg Kroah-Hartman char_time = timeout; 1562ab4382d2SGreg Kroah-Hartman 1563ab4382d2SGreg Kroah-Hartman /* 1564ab4382d2SGreg Kroah-Hartman * If the transmitter hasn't cleared in twice the approximate 1565ab4382d2SGreg Kroah-Hartman * amount of time to send the entire FIFO, it probably won't 1566ab4382d2SGreg Kroah-Hartman * ever clear. This assumes the UART isn't doing flow 1567ab4382d2SGreg Kroah-Hartman * control, which is currently the case. Hence, if it ever 1568ab4382d2SGreg Kroah-Hartman * takes longer than port->timeout, this is probably due to a 1569ab4382d2SGreg Kroah-Hartman * UART bug of some kind. So, we clamp the timeout parameter at 1570ab4382d2SGreg Kroah-Hartman * 2*port->timeout. 1571ab4382d2SGreg Kroah-Hartman */ 1572ab4382d2SGreg Kroah-Hartman if (timeout == 0 || timeout > 2 * port->timeout) 1573ab4382d2SGreg Kroah-Hartman timeout = 2 * port->timeout; 1574ab4382d2SGreg Kroah-Hartman 1575ab4382d2SGreg Kroah-Hartman expire = jiffies + timeout; 1576ab4382d2SGreg Kroah-Hartman 1577ab4382d2SGreg Kroah-Hartman pr_debug("uart_wait_until_sent(%d), jiffies=%lu, expire=%lu...\n", 1578ab4382d2SGreg Kroah-Hartman port->line, jiffies, expire); 1579ab4382d2SGreg Kroah-Hartman 1580ab4382d2SGreg Kroah-Hartman /* 1581ab4382d2SGreg Kroah-Hartman * Check whether the transmitter is empty every 'char_time'. 1582ab4382d2SGreg Kroah-Hartman * 'timeout' / 'expire' give us the maximum amount of time 1583ab4382d2SGreg Kroah-Hartman * we wait. 1584ab4382d2SGreg Kroah-Hartman */ 1585ab4382d2SGreg Kroah-Hartman while (!port->ops->tx_empty(port)) { 1586ab4382d2SGreg Kroah-Hartman msleep_interruptible(jiffies_to_msecs(char_time)); 1587ab4382d2SGreg Kroah-Hartman if (signal_pending(current)) 1588ab4382d2SGreg Kroah-Hartman break; 1589ab4382d2SGreg Kroah-Hartman if (time_after(jiffies, expire)) 1590ab4382d2SGreg Kroah-Hartman break; 1591ab4382d2SGreg Kroah-Hartman } 15929ed19428SPeter Hurley uart_port_deref(port); 1593ab4382d2SGreg Kroah-Hartman } 1594ab4382d2SGreg Kroah-Hartman 1595ab4382d2SGreg Kroah-Hartman /* 1596ef4f527cSKevin Cernekee * Calls to uart_hangup() are serialised by the tty_lock in 1597ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:do_tty_hangup() 1598ef4f527cSKevin Cernekee * This runs from a workqueue and can sleep for a _short_ time only. 1599ab4382d2SGreg Kroah-Hartman */ 1600ab4382d2SGreg Kroah-Hartman static void uart_hangup(struct tty_struct *tty) 1601ab4382d2SGreg Kroah-Hartman { 1602ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1603ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1604af224ca2SPeter Hurley struct uart_port *uport; 1605ab4382d2SGreg Kroah-Hartman unsigned long flags; 1606ab4382d2SGreg Kroah-Hartman 160739b3d892SPeter Hurley pr_debug("uart_hangup(%d)\n", tty->index); 1608ab4382d2SGreg Kroah-Hartman 1609ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1610af224ca2SPeter Hurley uport = uart_port_check(state); 1611af224ca2SPeter Hurley WARN(!uport, "hangup of detached port!\n"); 1612af224ca2SPeter Hurley 1613807c8d81SPeter Hurley if (tty_port_active(port)) { 1614ab4382d2SGreg Kroah-Hartman uart_flush_buffer(tty); 1615ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 1616ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 1617ab4382d2SGreg Kroah-Hartman port->count = 0; 1618ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 1619807c8d81SPeter Hurley tty_port_set_active(port, 0); 1620ab4382d2SGreg Kroah-Hartman tty_port_tty_set(port, NULL); 1621af224ca2SPeter Hurley if (uport && !uart_console(uport)) 1622bf903c0cSGeert Uytterhoeven uart_change_pm(state, UART_PM_STATE_OFF); 1623ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->open_wait); 1624ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->delta_msr_wait); 1625ab4382d2SGreg Kroah-Hartman } 1626ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1627ab4382d2SGreg Kroah-Hartman } 1628ab4382d2SGreg Kroah-Hartman 1629af224ca2SPeter Hurley /* uport == NULL if uart_port has already been removed */ 16300b1db830SJiri Slaby static void uart_port_shutdown(struct tty_port *port) 16310b1db830SJiri Slaby { 1632b922e19dSJiri Slaby struct uart_state *state = container_of(port, struct uart_state, port); 16334047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 1634b922e19dSJiri Slaby 1635b922e19dSJiri Slaby /* 1636b922e19dSJiri Slaby * clear delta_msr_wait queue to avoid mem leaks: we may free 1637b922e19dSJiri Slaby * the irq here so the queue might never be woken up. Note 1638b922e19dSJiri Slaby * that we won't end up waiting on delta_msr_wait again since 1639b922e19dSJiri Slaby * any outstanding file descriptors should be pointing at 1640b922e19dSJiri Slaby * hung_up_tty_fops now. 1641b922e19dSJiri Slaby */ 1642b922e19dSJiri Slaby wake_up_interruptible(&port->delta_msr_wait); 1643b922e19dSJiri Slaby 1644b922e19dSJiri Slaby /* 1645b922e19dSJiri Slaby * Free the IRQ and disable the port. 1646b922e19dSJiri Slaby */ 1647af224ca2SPeter Hurley if (uport) 1648b922e19dSJiri Slaby uport->ops->shutdown(uport); 1649b922e19dSJiri Slaby 1650b922e19dSJiri Slaby /* 1651b922e19dSJiri Slaby * Ensure that the IRQ handler isn't running on another CPU. 1652b922e19dSJiri Slaby */ 1653af224ca2SPeter Hurley if (uport) 1654b922e19dSJiri Slaby synchronize_irq(uport->irq); 16550b1db830SJiri Slaby } 16560b1db830SJiri Slaby 1657ab4382d2SGreg Kroah-Hartman static int uart_carrier_raised(struct tty_port *port) 1658ab4382d2SGreg Kroah-Hartman { 1659ab4382d2SGreg Kroah-Hartman struct uart_state *state = container_of(port, struct uart_state, port); 16609ed19428SPeter Hurley struct uart_port *uport; 1661ab4382d2SGreg Kroah-Hartman int mctrl; 16629ed19428SPeter Hurley 16639ed19428SPeter Hurley uport = uart_port_ref(state); 16649ed19428SPeter Hurley /* 16659ed19428SPeter Hurley * Should never observe uport == NULL since checks for hangup should 16669ed19428SPeter Hurley * abort the tty_port_block_til_ready() loop before checking for carrier 16679ed19428SPeter Hurley * raised -- but report carrier raised if it does anyway so open will 16689ed19428SPeter Hurley * continue and not sleep 16699ed19428SPeter Hurley */ 16709ed19428SPeter Hurley if (WARN_ON(!uport)) 16719ed19428SPeter Hurley return 1; 1672ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 16731fdc3106SAlexander Shiyan uart_enable_ms(uport); 1674ab4382d2SGreg Kroah-Hartman mctrl = uport->ops->get_mctrl(uport); 1675ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 16769ed19428SPeter Hurley uart_port_deref(uport); 1677ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_CAR) 1678ab4382d2SGreg Kroah-Hartman return 1; 1679ab4382d2SGreg Kroah-Hartman return 0; 1680ab4382d2SGreg Kroah-Hartman } 1681ab4382d2SGreg Kroah-Hartman 1682a6845e1eSRafael Gago static void uart_dtr_rts(struct tty_port *port, int raise) 1683ab4382d2SGreg Kroah-Hartman { 1684ab4382d2SGreg Kroah-Hartman struct uart_state *state = container_of(port, struct uart_state, port); 16859ed19428SPeter Hurley struct uart_port *uport; 16869ed19428SPeter Hurley 16879ed19428SPeter Hurley uport = uart_port_ref(state); 16889ed19428SPeter Hurley if (!uport) 16899ed19428SPeter Hurley return; 1690a6845e1eSRafael Gago uart_port_dtr_rts(uport, raise); 16919ed19428SPeter Hurley uart_port_deref(uport); 1692ab4382d2SGreg Kroah-Hartman } 1693ab4382d2SGreg Kroah-Hartman 1694ab4382d2SGreg Kroah-Hartman /* 1695ef4f527cSKevin Cernekee * Calls to uart_open are serialised by the tty_lock in 1696ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:tty_open() 1697ab4382d2SGreg Kroah-Hartman * Note that if this fails, then uart_close() _will_ be called. 1698ab4382d2SGreg Kroah-Hartman * 1699ab4382d2SGreg Kroah-Hartman * In time, we want to scrap the "opening nonpresent ports" 1700ab4382d2SGreg Kroah-Hartman * behaviour and implement an alternative way for setserial 1701ab4382d2SGreg Kroah-Hartman * to set base addresses/ports/types. This will allow us to 1702ab4382d2SGreg Kroah-Hartman * get rid of a certain amount of extra tests. 1703ab4382d2SGreg Kroah-Hartman */ 1704ab4382d2SGreg Kroah-Hartman static int uart_open(struct tty_struct *tty, struct file *filp) 1705ab4382d2SGreg Kroah-Hartman { 17065e388027SPeter Hurley struct uart_driver *drv = tty->driver->driver_state; 1707ab4382d2SGreg Kroah-Hartman int retval, line = tty->index; 17081c7b13c4SJiri Slaby struct uart_state *state = drv->state + line; 1709ab4382d2SGreg Kroah-Hartman 1710ab4382d2SGreg Kroah-Hartman tty->driver_data = state; 1711b3b57646SRob Herring 1712b3b57646SRob Herring retval = tty_port_open(&state->port, tty, filp); 1713b3b57646SRob Herring if (retval > 0) 1714b3b57646SRob Herring retval = 0; 1715b3b57646SRob Herring 1716b3b57646SRob Herring return retval; 1717b3b57646SRob Herring } 1718b3b57646SRob Herring 1719b3b57646SRob Herring static int uart_port_activate(struct tty_port *port, struct tty_struct *tty) 1720b3b57646SRob Herring { 1721b3b57646SRob Herring struct uart_state *state = container_of(port, struct uart_state, port); 1722b3b57646SRob Herring struct uart_port *uport; 1723b3b57646SRob Herring 1724b3b57646SRob Herring uport = uart_port_check(state); 1725b3b57646SRob Herring if (!uport || uport->flags & UPF_DEAD) 1726b3b57646SRob Herring return -ENXIO; 1727b3b57646SRob Herring 17284047b371SPeter Hurley port->low_latency = (uport->flags & UPF_LOW_LATENCY) ? 1 : 0; 1729ab4382d2SGreg Kroah-Hartman 1730ab4382d2SGreg Kroah-Hartman /* 1731ab4382d2SGreg Kroah-Hartman * Start up the serial port. 1732ab4382d2SGreg Kroah-Hartman */ 1733b3b57646SRob Herring return uart_startup(tty, state, 0); 1734ab4382d2SGreg Kroah-Hartman } 1735ab4382d2SGreg Kroah-Hartman 1736ab4382d2SGreg Kroah-Hartman static const char *uart_type(struct uart_port *port) 1737ab4382d2SGreg Kroah-Hartman { 1738ab4382d2SGreg Kroah-Hartman const char *str = NULL; 1739ab4382d2SGreg Kroah-Hartman 1740ab4382d2SGreg Kroah-Hartman if (port->ops->type) 1741ab4382d2SGreg Kroah-Hartman str = port->ops->type(port); 1742ab4382d2SGreg Kroah-Hartman 1743ab4382d2SGreg Kroah-Hartman if (!str) 1744ab4382d2SGreg Kroah-Hartman str = "unknown"; 1745ab4382d2SGreg Kroah-Hartman 1746ab4382d2SGreg Kroah-Hartman return str; 1747ab4382d2SGreg Kroah-Hartman } 1748ab4382d2SGreg Kroah-Hartman 1749ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_PROC_FS 1750ab4382d2SGreg Kroah-Hartman 1751ab4382d2SGreg Kroah-Hartman static void uart_line_info(struct seq_file *m, struct uart_driver *drv, int i) 1752ab4382d2SGreg Kroah-Hartman { 1753ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + i; 1754ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 17556f538fe3SLinus Walleij enum uart_pm_state pm_state; 17564047b371SPeter Hurley struct uart_port *uport; 1757ab4382d2SGreg Kroah-Hartman char stat_buf[32]; 1758ab4382d2SGreg Kroah-Hartman unsigned int status; 1759ab4382d2SGreg Kroah-Hartman int mmio; 1760ab4382d2SGreg Kroah-Hartman 17614047b371SPeter Hurley mutex_lock(&port->mutex); 17624047b371SPeter Hurley uport = uart_port_check(state); 1763ab4382d2SGreg Kroah-Hartman if (!uport) 17644047b371SPeter Hurley goto out; 1765ab4382d2SGreg Kroah-Hartman 1766ab4382d2SGreg Kroah-Hartman mmio = uport->iotype >= UPIO_MEM; 1767ab4382d2SGreg Kroah-Hartman seq_printf(m, "%d: uart:%s %s%08llX irq:%d", 1768ab4382d2SGreg Kroah-Hartman uport->line, uart_type(uport), 1769ab4382d2SGreg Kroah-Hartman mmio ? "mmio:0x" : "port:", 1770ab4382d2SGreg Kroah-Hartman mmio ? (unsigned long long)uport->mapbase 1771ab4382d2SGreg Kroah-Hartman : (unsigned long long)uport->iobase, 1772ab4382d2SGreg Kroah-Hartman uport->irq); 1773ab4382d2SGreg Kroah-Hartman 1774ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) { 1775ab4382d2SGreg Kroah-Hartman seq_putc(m, '\n'); 17764047b371SPeter Hurley goto out; 1777ab4382d2SGreg Kroah-Hartman } 1778ab4382d2SGreg Kroah-Hartman 1779ab4382d2SGreg Kroah-Hartman if (capable(CAP_SYS_ADMIN)) { 1780ab4382d2SGreg Kroah-Hartman pm_state = state->pm_state; 17816f538fe3SLinus Walleij if (pm_state != UART_PM_STATE_ON) 17826f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 1783ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1784ab4382d2SGreg Kroah-Hartman status = uport->ops->get_mctrl(uport); 1785ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 17866f538fe3SLinus Walleij if (pm_state != UART_PM_STATE_ON) 1787ab4382d2SGreg Kroah-Hartman uart_change_pm(state, pm_state); 1788ab4382d2SGreg Kroah-Hartman 1789ab4382d2SGreg Kroah-Hartman seq_printf(m, " tx:%d rx:%d", 1790ab4382d2SGreg Kroah-Hartman uport->icount.tx, uport->icount.rx); 1791ab4382d2SGreg Kroah-Hartman if (uport->icount.frame) 1792968af298SPeter Hurley seq_printf(m, " fe:%d", uport->icount.frame); 1793ab4382d2SGreg Kroah-Hartman if (uport->icount.parity) 1794968af298SPeter Hurley seq_printf(m, " pe:%d", uport->icount.parity); 1795ab4382d2SGreg Kroah-Hartman if (uport->icount.brk) 1796968af298SPeter Hurley seq_printf(m, " brk:%d", uport->icount.brk); 1797ab4382d2SGreg Kroah-Hartman if (uport->icount.overrun) 1798968af298SPeter Hurley seq_printf(m, " oe:%d", uport->icount.overrun); 1799ab4382d2SGreg Kroah-Hartman 1800ab4382d2SGreg Kroah-Hartman #define INFOBIT(bit, str) \ 1801ab4382d2SGreg Kroah-Hartman if (uport->mctrl & (bit)) \ 1802ab4382d2SGreg Kroah-Hartman strncat(stat_buf, (str), sizeof(stat_buf) - \ 1803ab4382d2SGreg Kroah-Hartman strlen(stat_buf) - 2) 1804ab4382d2SGreg Kroah-Hartman #define STATBIT(bit, str) \ 1805ab4382d2SGreg Kroah-Hartman if (status & (bit)) \ 1806ab4382d2SGreg Kroah-Hartman strncat(stat_buf, (str), sizeof(stat_buf) - \ 1807ab4382d2SGreg Kroah-Hartman strlen(stat_buf) - 2) 1808ab4382d2SGreg Kroah-Hartman 1809ab4382d2SGreg Kroah-Hartman stat_buf[0] = '\0'; 1810ab4382d2SGreg Kroah-Hartman stat_buf[1] = '\0'; 1811ab4382d2SGreg Kroah-Hartman INFOBIT(TIOCM_RTS, "|RTS"); 1812ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_CTS, "|CTS"); 1813ab4382d2SGreg Kroah-Hartman INFOBIT(TIOCM_DTR, "|DTR"); 1814ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_DSR, "|DSR"); 1815ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_CAR, "|CD"); 1816ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_RNG, "|RI"); 1817ab4382d2SGreg Kroah-Hartman if (stat_buf[0]) 1818ab4382d2SGreg Kroah-Hartman stat_buf[0] = ' '; 1819ab4382d2SGreg Kroah-Hartman 1820ab4382d2SGreg Kroah-Hartman seq_puts(m, stat_buf); 1821ab4382d2SGreg Kroah-Hartman } 1822ab4382d2SGreg Kroah-Hartman seq_putc(m, '\n'); 1823ab4382d2SGreg Kroah-Hartman #undef STATBIT 1824ab4382d2SGreg Kroah-Hartman #undef INFOBIT 18254047b371SPeter Hurley out: 18264047b371SPeter Hurley mutex_unlock(&port->mutex); 1827ab4382d2SGreg Kroah-Hartman } 1828ab4382d2SGreg Kroah-Hartman 1829ab4382d2SGreg Kroah-Hartman static int uart_proc_show(struct seq_file *m, void *v) 1830ab4382d2SGreg Kroah-Hartman { 1831ab4382d2SGreg Kroah-Hartman struct tty_driver *ttydrv = m->private; 1832ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = ttydrv->driver_state; 1833ab4382d2SGreg Kroah-Hartman int i; 1834ab4382d2SGreg Kroah-Hartman 1835968af298SPeter Hurley seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n", "", "", ""); 1836ab4382d2SGreg Kroah-Hartman for (i = 0; i < drv->nr; i++) 1837ab4382d2SGreg Kroah-Hartman uart_line_info(m, drv, i); 1838ab4382d2SGreg Kroah-Hartman return 0; 1839ab4382d2SGreg Kroah-Hartman } 1840ab4382d2SGreg Kroah-Hartman 1841ab4382d2SGreg Kroah-Hartman static int uart_proc_open(struct inode *inode, struct file *file) 1842ab4382d2SGreg Kroah-Hartman { 1843d9dda78bSAl Viro return single_open(file, uart_proc_show, PDE_DATA(inode)); 1844ab4382d2SGreg Kroah-Hartman } 1845ab4382d2SGreg Kroah-Hartman 1846ab4382d2SGreg Kroah-Hartman static const struct file_operations uart_proc_fops = { 1847ab4382d2SGreg Kroah-Hartman .owner = THIS_MODULE, 1848ab4382d2SGreg Kroah-Hartman .open = uart_proc_open, 1849ab4382d2SGreg Kroah-Hartman .read = seq_read, 1850ab4382d2SGreg Kroah-Hartman .llseek = seq_lseek, 1851ab4382d2SGreg Kroah-Hartman .release = single_release, 1852ab4382d2SGreg Kroah-Hartman }; 1853ab4382d2SGreg Kroah-Hartman #endif 1854ab4382d2SGreg Kroah-Hartman 1855ab4382d2SGreg Kroah-Hartman #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL) 18561cfe42b7SPeter Hurley /** 1857ab4382d2SGreg Kroah-Hartman * uart_console_write - write a console message to a serial port 1858ab4382d2SGreg Kroah-Hartman * @port: the port to write the message 1859ab4382d2SGreg Kroah-Hartman * @s: array of characters 1860ab4382d2SGreg Kroah-Hartman * @count: number of characters in string to write 186110afbe34SPeter Hurley * @putchar: function to write character to port 1862ab4382d2SGreg Kroah-Hartman */ 1863ab4382d2SGreg Kroah-Hartman void uart_console_write(struct uart_port *port, const char *s, 1864ab4382d2SGreg Kroah-Hartman unsigned int count, 1865ab4382d2SGreg Kroah-Hartman void (*putchar)(struct uart_port *, int)) 1866ab4382d2SGreg Kroah-Hartman { 1867ab4382d2SGreg Kroah-Hartman unsigned int i; 1868ab4382d2SGreg Kroah-Hartman 1869ab4382d2SGreg Kroah-Hartman for (i = 0; i < count; i++, s++) { 1870ab4382d2SGreg Kroah-Hartman if (*s == '\n') 1871ab4382d2SGreg Kroah-Hartman putchar(port, '\r'); 1872ab4382d2SGreg Kroah-Hartman putchar(port, *s); 1873ab4382d2SGreg Kroah-Hartman } 1874ab4382d2SGreg Kroah-Hartman } 1875ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_console_write); 1876ab4382d2SGreg Kroah-Hartman 1877ab4382d2SGreg Kroah-Hartman /* 1878ab4382d2SGreg Kroah-Hartman * Check whether an invalid uart number has been specified, and 1879ab4382d2SGreg Kroah-Hartman * if so, search for the first available port that does have 1880ab4382d2SGreg Kroah-Hartman * console support. 1881ab4382d2SGreg Kroah-Hartman */ 1882ab4382d2SGreg Kroah-Hartman struct uart_port * __init 1883ab4382d2SGreg Kroah-Hartman uart_get_console(struct uart_port *ports, int nr, struct console *co) 1884ab4382d2SGreg Kroah-Hartman { 1885ab4382d2SGreg Kroah-Hartman int idx = co->index; 1886ab4382d2SGreg Kroah-Hartman 1887ab4382d2SGreg Kroah-Hartman if (idx < 0 || idx >= nr || (ports[idx].iobase == 0 && 1888ab4382d2SGreg Kroah-Hartman ports[idx].membase == NULL)) 1889ab4382d2SGreg Kroah-Hartman for (idx = 0; idx < nr; idx++) 1890ab4382d2SGreg Kroah-Hartman if (ports[idx].iobase != 0 || 1891ab4382d2SGreg Kroah-Hartman ports[idx].membase != NULL) 1892ab4382d2SGreg Kroah-Hartman break; 1893ab4382d2SGreg Kroah-Hartman 1894ab4382d2SGreg Kroah-Hartman co->index = idx; 1895ab4382d2SGreg Kroah-Hartman 1896ab4382d2SGreg Kroah-Hartman return ports + idx; 1897ab4382d2SGreg Kroah-Hartman } 1898ab4382d2SGreg Kroah-Hartman 1899ab4382d2SGreg Kroah-Hartman /** 190073abaf87SPeter Hurley * uart_parse_earlycon - Parse earlycon options 190173abaf87SPeter Hurley * @p: ptr to 2nd field (ie., just beyond '<name>,') 190273abaf87SPeter Hurley * @iotype: ptr for decoded iotype (out) 190373abaf87SPeter Hurley * @addr: ptr for decoded mapbase/iobase (out) 190473abaf87SPeter Hurley * @options: ptr for <options> field; NULL if not present (out) 190573abaf87SPeter Hurley * 190673abaf87SPeter Hurley * Decodes earlycon kernel command line parameters of the form 1907bd94c407SMasahiro Yamada * earlycon=<name>,io|mmio|mmio16|mmio32|mmio32be|mmio32native,<addr>,<options> 1908bd94c407SMasahiro Yamada * console=<name>,io|mmio|mmio16|mmio32|mmio32be|mmio32native,<addr>,<options> 190973abaf87SPeter Hurley * 191073abaf87SPeter Hurley * The optional form 191173abaf87SPeter Hurley * earlycon=<name>,0x<addr>,<options> 191273abaf87SPeter Hurley * console=<name>,0x<addr>,<options> 191373abaf87SPeter Hurley * is also accepted; the returned @iotype will be UPIO_MEM. 191473abaf87SPeter Hurley * 19158b2303deSAlexander Sverdlin * Returns 0 on success or -EINVAL on failure 191673abaf87SPeter Hurley */ 191746e36683SAlexander Sverdlin int uart_parse_earlycon(char *p, unsigned char *iotype, resource_size_t *addr, 191873abaf87SPeter Hurley char **options) 191973abaf87SPeter Hurley { 192073abaf87SPeter Hurley if (strncmp(p, "mmio,", 5) == 0) { 192173abaf87SPeter Hurley *iotype = UPIO_MEM; 192273abaf87SPeter Hurley p += 5; 1923bd94c407SMasahiro Yamada } else if (strncmp(p, "mmio16,", 7) == 0) { 1924bd94c407SMasahiro Yamada *iotype = UPIO_MEM16; 1925bd94c407SMasahiro Yamada p += 7; 192673abaf87SPeter Hurley } else if (strncmp(p, "mmio32,", 7) == 0) { 192773abaf87SPeter Hurley *iotype = UPIO_MEM32; 192873abaf87SPeter Hurley p += 7; 19296e63be3fSNoam Camus } else if (strncmp(p, "mmio32be,", 9) == 0) { 19306e63be3fSNoam Camus *iotype = UPIO_MEM32BE; 19316e63be3fSNoam Camus p += 9; 1932d215d809SMax Filippov } else if (strncmp(p, "mmio32native,", 13) == 0) { 1933d215d809SMax Filippov *iotype = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) ? 1934d215d809SMax Filippov UPIO_MEM32BE : UPIO_MEM32; 1935d215d809SMax Filippov p += 13; 193673abaf87SPeter Hurley } else if (strncmp(p, "io,", 3) == 0) { 193773abaf87SPeter Hurley *iotype = UPIO_PORT; 193873abaf87SPeter Hurley p += 3; 193973abaf87SPeter Hurley } else if (strncmp(p, "0x", 2) == 0) { 194073abaf87SPeter Hurley *iotype = UPIO_MEM; 194173abaf87SPeter Hurley } else { 194273abaf87SPeter Hurley return -EINVAL; 194373abaf87SPeter Hurley } 194473abaf87SPeter Hurley 19458b2303deSAlexander Sverdlin /* 19468b2303deSAlexander Sverdlin * Before you replace it with kstrtoull(), think about options separator 19478b2303deSAlexander Sverdlin * (',') it will not tolerate 19488b2303deSAlexander Sverdlin */ 19498b2303deSAlexander Sverdlin *addr = simple_strtoull(p, NULL, 0); 195073abaf87SPeter Hurley p = strchr(p, ','); 195173abaf87SPeter Hurley if (p) 195273abaf87SPeter Hurley p++; 195373abaf87SPeter Hurley 195473abaf87SPeter Hurley *options = p; 195573abaf87SPeter Hurley return 0; 195673abaf87SPeter Hurley } 195773abaf87SPeter Hurley EXPORT_SYMBOL_GPL(uart_parse_earlycon); 195873abaf87SPeter Hurley 195973abaf87SPeter Hurley /** 196002088ca6SGeert Uytterhoeven * uart_parse_options - Parse serial port baud/parity/bits/flow control. 1961ab4382d2SGreg Kroah-Hartman * @options: pointer to option string 1962ab4382d2SGreg Kroah-Hartman * @baud: pointer to an 'int' variable for the baud rate. 1963ab4382d2SGreg Kroah-Hartman * @parity: pointer to an 'int' variable for the parity. 1964ab4382d2SGreg Kroah-Hartman * @bits: pointer to an 'int' variable for the number of data bits. 1965ab4382d2SGreg Kroah-Hartman * @flow: pointer to an 'int' variable for the flow control character. 1966ab4382d2SGreg Kroah-Hartman * 1967ab4382d2SGreg Kroah-Hartman * uart_parse_options decodes a string containing the serial console 1968ab4382d2SGreg Kroah-Hartman * options. The format of the string is <baud><parity><bits><flow>, 1969ab4382d2SGreg Kroah-Hartman * eg: 115200n8r 1970ab4382d2SGreg Kroah-Hartman */ 1971ab4382d2SGreg Kroah-Hartman void 1972ab4382d2SGreg Kroah-Hartman uart_parse_options(char *options, int *baud, int *parity, int *bits, int *flow) 1973ab4382d2SGreg Kroah-Hartman { 1974ab4382d2SGreg Kroah-Hartman char *s = options; 1975ab4382d2SGreg Kroah-Hartman 1976ab4382d2SGreg Kroah-Hartman *baud = simple_strtoul(s, NULL, 10); 1977ab4382d2SGreg Kroah-Hartman while (*s >= '0' && *s <= '9') 1978ab4382d2SGreg Kroah-Hartman s++; 1979ab4382d2SGreg Kroah-Hartman if (*s) 1980ab4382d2SGreg Kroah-Hartman *parity = *s++; 1981ab4382d2SGreg Kroah-Hartman if (*s) 1982ab4382d2SGreg Kroah-Hartman *bits = *s++ - '0'; 1983ab4382d2SGreg Kroah-Hartman if (*s) 1984ab4382d2SGreg Kroah-Hartman *flow = *s; 1985ab4382d2SGreg Kroah-Hartman } 1986ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_parse_options); 1987ab4382d2SGreg Kroah-Hartman 1988ab4382d2SGreg Kroah-Hartman /** 1989ab4382d2SGreg Kroah-Hartman * uart_set_options - setup the serial console parameters 1990ab4382d2SGreg Kroah-Hartman * @port: pointer to the serial ports uart_port structure 1991ab4382d2SGreg Kroah-Hartman * @co: console pointer 1992ab4382d2SGreg Kroah-Hartman * @baud: baud rate 1993ab4382d2SGreg Kroah-Hartman * @parity: parity character - 'n' (none), 'o' (odd), 'e' (even) 1994ab4382d2SGreg Kroah-Hartman * @bits: number of data bits 1995ab4382d2SGreg Kroah-Hartman * @flow: flow control character - 'r' (rts) 1996ab4382d2SGreg Kroah-Hartman */ 1997ab4382d2SGreg Kroah-Hartman int 1998ab4382d2SGreg Kroah-Hartman uart_set_options(struct uart_port *port, struct console *co, 1999ab4382d2SGreg Kroah-Hartman int baud, int parity, int bits, int flow) 2000ab4382d2SGreg Kroah-Hartman { 2001ab4382d2SGreg Kroah-Hartman struct ktermios termios; 2002ab4382d2SGreg Kroah-Hartman static struct ktermios dummy; 2003ab4382d2SGreg Kroah-Hartman 2004ab4382d2SGreg Kroah-Hartman /* 2005ab4382d2SGreg Kroah-Hartman * Ensure that the serial console lock is initialised 2006ab4382d2SGreg Kroah-Hartman * early. 200742b6a1baSRandy Witt * If this port is a console, then the spinlock is already 200842b6a1baSRandy Witt * initialised. 2009ab4382d2SGreg Kroah-Hartman */ 201042b6a1baSRandy Witt if (!(uart_console(port) && (port->cons->flags & CON_ENABLED))) { 2011ab4382d2SGreg Kroah-Hartman spin_lock_init(&port->lock); 2012ab4382d2SGreg Kroah-Hartman lockdep_set_class(&port->lock, &port_lock_key); 201342b6a1baSRandy Witt } 2014ab4382d2SGreg Kroah-Hartman 2015ab4382d2SGreg Kroah-Hartman memset(&termios, 0, sizeof(struct ktermios)); 2016ab4382d2SGreg Kroah-Hartman 2017ba47f97aSJeffy Chen termios.c_cflag |= CREAD | HUPCL | CLOCAL; 2018ba47f97aSJeffy Chen tty_termios_encode_baud_rate(&termios, baud, baud); 2019ab4382d2SGreg Kroah-Hartman 2020ab4382d2SGreg Kroah-Hartman if (bits == 7) 2021ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CS7; 2022ab4382d2SGreg Kroah-Hartman else 2023ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CS8; 2024ab4382d2SGreg Kroah-Hartman 2025ab4382d2SGreg Kroah-Hartman switch (parity) { 2026ab4382d2SGreg Kroah-Hartman case 'o': case 'O': 2027ab4382d2SGreg Kroah-Hartman termios.c_cflag |= PARODD; 2028ab4382d2SGreg Kroah-Hartman /*fall through*/ 2029ab4382d2SGreg Kroah-Hartman case 'e': case 'E': 2030ab4382d2SGreg Kroah-Hartman termios.c_cflag |= PARENB; 2031ab4382d2SGreg Kroah-Hartman break; 2032ab4382d2SGreg Kroah-Hartman } 2033ab4382d2SGreg Kroah-Hartman 2034ab4382d2SGreg Kroah-Hartman if (flow == 'r') 2035ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CRTSCTS; 2036ab4382d2SGreg Kroah-Hartman 2037ab4382d2SGreg Kroah-Hartman /* 2038ab4382d2SGreg Kroah-Hartman * some uarts on other side don't support no flow control. 2039ab4382d2SGreg Kroah-Hartman * So we set * DTR in host uart to make them happy 2040ab4382d2SGreg Kroah-Hartman */ 2041ab4382d2SGreg Kroah-Hartman port->mctrl |= TIOCM_DTR; 2042ab4382d2SGreg Kroah-Hartman 2043ab4382d2SGreg Kroah-Hartman port->ops->set_termios(port, &termios, &dummy); 2044ab4382d2SGreg Kroah-Hartman /* 2045ab4382d2SGreg Kroah-Hartman * Allow the setting of the UART parameters with a NULL console 2046ab4382d2SGreg Kroah-Hartman * too: 2047ab4382d2SGreg Kroah-Hartman */ 2048ab4382d2SGreg Kroah-Hartman if (co) 2049ab4382d2SGreg Kroah-Hartman co->cflag = termios.c_cflag; 2050ab4382d2SGreg Kroah-Hartman 2051ab4382d2SGreg Kroah-Hartman return 0; 2052ab4382d2SGreg Kroah-Hartman } 2053ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_set_options); 2054ab4382d2SGreg Kroah-Hartman #endif /* CONFIG_SERIAL_CORE_CONSOLE */ 2055ab4382d2SGreg Kroah-Hartman 2056cf75525fSJiri Slaby /** 2057cf75525fSJiri Slaby * uart_change_pm - set power state of the port 2058cf75525fSJiri Slaby * 2059cf75525fSJiri Slaby * @state: port descriptor 2060cf75525fSJiri Slaby * @pm_state: new state 2061cf75525fSJiri Slaby * 2062cf75525fSJiri Slaby * Locking: port->mutex has to be held 2063cf75525fSJiri Slaby */ 20646f538fe3SLinus Walleij static void uart_change_pm(struct uart_state *state, 20656f538fe3SLinus Walleij enum uart_pm_state pm_state) 2066ab4382d2SGreg Kroah-Hartman { 20674047b371SPeter Hurley struct uart_port *port = uart_port_check(state); 2068ab4382d2SGreg Kroah-Hartman 2069ab4382d2SGreg Kroah-Hartman if (state->pm_state != pm_state) { 20704047b371SPeter Hurley if (port && port->ops->pm) 2071ab4382d2SGreg Kroah-Hartman port->ops->pm(port, pm_state, state->pm_state); 2072ab4382d2SGreg Kroah-Hartman state->pm_state = pm_state; 2073ab4382d2SGreg Kroah-Hartman } 2074ab4382d2SGreg Kroah-Hartman } 2075ab4382d2SGreg Kroah-Hartman 2076ab4382d2SGreg Kroah-Hartman struct uart_match { 2077ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2078ab4382d2SGreg Kroah-Hartman struct uart_driver *driver; 2079ab4382d2SGreg Kroah-Hartman }; 2080ab4382d2SGreg Kroah-Hartman 2081ab4382d2SGreg Kroah-Hartman static int serial_match_port(struct device *dev, void *data) 2082ab4382d2SGreg Kroah-Hartman { 2083ab4382d2SGreg Kroah-Hartman struct uart_match *match = data; 2084ab4382d2SGreg Kroah-Hartman struct tty_driver *tty_drv = match->driver->tty_driver; 2085ab4382d2SGreg Kroah-Hartman dev_t devt = MKDEV(tty_drv->major, tty_drv->minor_start) + 2086ab4382d2SGreg Kroah-Hartman match->port->line; 2087ab4382d2SGreg Kroah-Hartman 2088ab4382d2SGreg Kroah-Hartman return dev->devt == devt; /* Actually, only one tty per port */ 2089ab4382d2SGreg Kroah-Hartman } 2090ab4382d2SGreg Kroah-Hartman 2091ab4382d2SGreg Kroah-Hartman int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport) 2092ab4382d2SGreg Kroah-Hartman { 2093ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 2094ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2095ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 2096ab4382d2SGreg Kroah-Hartman struct uart_match match = {uport, drv}; 2097ab4382d2SGreg Kroah-Hartman 2098ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2099ab4382d2SGreg Kroah-Hartman 2100ab4382d2SGreg Kroah-Hartman tty_dev = device_find_child(uport->dev, &match, serial_match_port); 210188e2582eSLucas Stach if (tty_dev && device_may_wakeup(tty_dev)) { 2102aef3ad10SAndy Shevchenko enable_irq_wake(uport->irq); 2103ab4382d2SGreg Kroah-Hartman put_device(tty_dev); 2104ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2105ab4382d2SGreg Kroah-Hartman return 0; 2106ab4382d2SGreg Kroah-Hartman } 21075a65dcc0SFederico Vaga put_device(tty_dev); 21085a65dcc0SFederico Vaga 2109b164c972SPeter Hurley /* Nothing to do if the console is not suspending */ 2110b164c972SPeter Hurley if (!console_suspend_enabled && uart_console(uport)) 2111b164c972SPeter Hurley goto unlock; 2112b164c972SPeter Hurley 2113ab4382d2SGreg Kroah-Hartman uport->suspended = 1; 2114ab4382d2SGreg Kroah-Hartman 2115d41861caSPeter Hurley if (tty_port_initialized(port)) { 2116ab4382d2SGreg Kroah-Hartman const struct uart_ops *ops = uport->ops; 2117ab4382d2SGreg Kroah-Hartman int tries; 2118ab4382d2SGreg Kroah-Hartman 211980f02d54SPeter Hurley tty_port_set_suspended(port, 1); 2120d41861caSPeter Hurley tty_port_set_initialized(port, 0); 2121ab4382d2SGreg Kroah-Hartman 2122ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 2123ab4382d2SGreg Kroah-Hartman ops->stop_tx(uport); 2124ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, 0); 2125ab4382d2SGreg Kroah-Hartman ops->stop_rx(uport); 2126ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2127ab4382d2SGreg Kroah-Hartman 2128ab4382d2SGreg Kroah-Hartman /* 2129ab4382d2SGreg Kroah-Hartman * Wait for the transmitter to empty. 2130ab4382d2SGreg Kroah-Hartman */ 2131ab4382d2SGreg Kroah-Hartman for (tries = 3; !ops->tx_empty(uport) && tries; tries--) 2132ab4382d2SGreg Kroah-Hartman msleep(10); 2133ab4382d2SGreg Kroah-Hartman if (!tries) 2134cade3580SAndy Shevchenko dev_err(uport->dev, "%s: Unable to drain transmitter\n", 2135cade3580SAndy Shevchenko uport->name); 2136ab4382d2SGreg Kroah-Hartman 2137ab4382d2SGreg Kroah-Hartman ops->shutdown(uport); 2138ab4382d2SGreg Kroah-Hartman } 2139ab4382d2SGreg Kroah-Hartman 2140ab4382d2SGreg Kroah-Hartman /* 2141ab4382d2SGreg Kroah-Hartman * Disable the console device before suspending. 2142ab4382d2SGreg Kroah-Hartman */ 2143b164c972SPeter Hurley if (uart_console(uport)) 2144ab4382d2SGreg Kroah-Hartman console_stop(uport->cons); 2145ab4382d2SGreg Kroah-Hartman 21466f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_OFF); 2147b164c972SPeter Hurley unlock: 2148ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2149ab4382d2SGreg Kroah-Hartman 2150ab4382d2SGreg Kroah-Hartman return 0; 2151ab4382d2SGreg Kroah-Hartman } 2152ab4382d2SGreg Kroah-Hartman 2153ab4382d2SGreg Kroah-Hartman int uart_resume_port(struct uart_driver *drv, struct uart_port *uport) 2154ab4382d2SGreg Kroah-Hartman { 2155ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 2156ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2157ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 2158ab4382d2SGreg Kroah-Hartman struct uart_match match = {uport, drv}; 2159ab4382d2SGreg Kroah-Hartman struct ktermios termios; 2160ab4382d2SGreg Kroah-Hartman 2161ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2162ab4382d2SGreg Kroah-Hartman 2163ab4382d2SGreg Kroah-Hartman tty_dev = device_find_child(uport->dev, &match, serial_match_port); 2164ab4382d2SGreg Kroah-Hartman if (!uport->suspended && device_may_wakeup(tty_dev)) { 2165aef3ad10SAndy Shevchenko if (irqd_is_wakeup_set(irq_get_irq_data((uport->irq)))) 2166ab4382d2SGreg Kroah-Hartman disable_irq_wake(uport->irq); 21675a65dcc0SFederico Vaga put_device(tty_dev); 2168ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2169ab4382d2SGreg Kroah-Hartman return 0; 2170ab4382d2SGreg Kroah-Hartman } 21715a65dcc0SFederico Vaga put_device(tty_dev); 2172ab4382d2SGreg Kroah-Hartman uport->suspended = 0; 2173ab4382d2SGreg Kroah-Hartman 2174ab4382d2SGreg Kroah-Hartman /* 2175ab4382d2SGreg Kroah-Hartman * Re-enable the console device after suspending. 2176ab4382d2SGreg Kroah-Hartman */ 21775933a161SYin Kangkai if (uart_console(uport)) { 2178ab4382d2SGreg Kroah-Hartman /* 2179ab4382d2SGreg Kroah-Hartman * First try to use the console cflag setting. 2180ab4382d2SGreg Kroah-Hartman */ 2181ab4382d2SGreg Kroah-Hartman memset(&termios, 0, sizeof(struct ktermios)); 2182ab4382d2SGreg Kroah-Hartman termios.c_cflag = uport->cons->cflag; 2183ab4382d2SGreg Kroah-Hartman 2184ab4382d2SGreg Kroah-Hartman /* 2185ab4382d2SGreg Kroah-Hartman * If that's unset, use the tty termios setting. 2186ab4382d2SGreg Kroah-Hartman */ 2187adc8d746SAlan Cox if (port->tty && termios.c_cflag == 0) 2188adc8d746SAlan Cox termios = port->tty->termios; 2189ab4382d2SGreg Kroah-Hartman 219094abc56fSNing Jiang if (console_suspend_enabled) 21916f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2192ab4382d2SGreg Kroah-Hartman uport->ops->set_termios(uport, &termios, NULL); 21935933a161SYin Kangkai if (console_suspend_enabled) 2194ab4382d2SGreg Kroah-Hartman console_start(uport->cons); 2195ab4382d2SGreg Kroah-Hartman } 2196ab4382d2SGreg Kroah-Hartman 219780f02d54SPeter Hurley if (tty_port_suspended(port)) { 2198ab4382d2SGreg Kroah-Hartman const struct uart_ops *ops = uport->ops; 2199ab4382d2SGreg Kroah-Hartman int ret; 2200ab4382d2SGreg Kroah-Hartman 22016f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2202ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 2203ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, 0); 2204ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2205ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) { 2206ab4382d2SGreg Kroah-Hartman /* Protected by port mutex for now */ 2207ab4382d2SGreg Kroah-Hartman struct tty_struct *tty = port->tty; 2208ab4382d2SGreg Kroah-Hartman ret = ops->startup(uport); 2209ab4382d2SGreg Kroah-Hartman if (ret == 0) { 2210ab4382d2SGreg Kroah-Hartman if (tty) 2211ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 2212ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 2213ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, uport->mctrl); 2214ab4382d2SGreg Kroah-Hartman ops->start_tx(uport); 2215ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2216d41861caSPeter Hurley tty_port_set_initialized(port, 1); 2217ab4382d2SGreg Kroah-Hartman } else { 2218ab4382d2SGreg Kroah-Hartman /* 2219ab4382d2SGreg Kroah-Hartman * Failed to resume - maybe hardware went away? 2220ab4382d2SGreg Kroah-Hartman * Clear the "initialized" flag so we won't try 2221ab4382d2SGreg Kroah-Hartman * to call the low level drivers shutdown method. 2222ab4382d2SGreg Kroah-Hartman */ 2223ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 2224ab4382d2SGreg Kroah-Hartman } 2225ab4382d2SGreg Kroah-Hartman } 2226ab4382d2SGreg Kroah-Hartman 222780f02d54SPeter Hurley tty_port_set_suspended(port, 0); 2228ab4382d2SGreg Kroah-Hartman } 2229ab4382d2SGreg Kroah-Hartman 2230ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2231ab4382d2SGreg Kroah-Hartman 2232ab4382d2SGreg Kroah-Hartman return 0; 2233ab4382d2SGreg Kroah-Hartman } 2234ab4382d2SGreg Kroah-Hartman 2235ab4382d2SGreg Kroah-Hartman static inline void 2236ab4382d2SGreg Kroah-Hartman uart_report_port(struct uart_driver *drv, struct uart_port *port) 2237ab4382d2SGreg Kroah-Hartman { 2238ab4382d2SGreg Kroah-Hartman char address[64]; 2239ab4382d2SGreg Kroah-Hartman 2240ab4382d2SGreg Kroah-Hartman switch (port->iotype) { 2241ab4382d2SGreg Kroah-Hartman case UPIO_PORT: 2242ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), "I/O 0x%lx", port->iobase); 2243ab4382d2SGreg Kroah-Hartman break; 2244ab4382d2SGreg Kroah-Hartman case UPIO_HUB6: 2245ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), 2246ab4382d2SGreg Kroah-Hartman "I/O 0x%lx offset 0x%x", port->iobase, port->hub6); 2247ab4382d2SGreg Kroah-Hartman break; 2248ab4382d2SGreg Kroah-Hartman case UPIO_MEM: 2249bd94c407SMasahiro Yamada case UPIO_MEM16: 2250ab4382d2SGreg Kroah-Hartman case UPIO_MEM32: 22513ffb1a81SKevin Cernekee case UPIO_MEM32BE: 2252ab4382d2SGreg Kroah-Hartman case UPIO_AU: 2253ab4382d2SGreg Kroah-Hartman case UPIO_TSI: 2254ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), 2255ab4382d2SGreg Kroah-Hartman "MMIO 0x%llx", (unsigned long long)port->mapbase); 2256ab4382d2SGreg Kroah-Hartman break; 2257ab4382d2SGreg Kroah-Hartman default: 2258ab4382d2SGreg Kroah-Hartman strlcpy(address, "*unknown*", sizeof(address)); 2259ab4382d2SGreg Kroah-Hartman break; 2260ab4382d2SGreg Kroah-Hartman } 2261ab4382d2SGreg Kroah-Hartman 2262cade3580SAndy Shevchenko pr_info("%s%s%s at %s (irq = %d, base_baud = %d) is a %s\n", 226368ed7e1cSJames Bottomley port->dev ? dev_name(port->dev) : "", 226468ed7e1cSJames Bottomley port->dev ? ": " : "", 2265cade3580SAndy Shevchenko port->name, 22667d12b976SKees Cook address, port->irq, port->uartclk / 16, uart_type(port)); 2267ab4382d2SGreg Kroah-Hartman } 2268ab4382d2SGreg Kroah-Hartman 2269ab4382d2SGreg Kroah-Hartman static void 2270ab4382d2SGreg Kroah-Hartman uart_configure_port(struct uart_driver *drv, struct uart_state *state, 2271ab4382d2SGreg Kroah-Hartman struct uart_port *port) 2272ab4382d2SGreg Kroah-Hartman { 2273ab4382d2SGreg Kroah-Hartman unsigned int flags; 2274ab4382d2SGreg Kroah-Hartman 2275ab4382d2SGreg Kroah-Hartman /* 2276ab4382d2SGreg Kroah-Hartman * If there isn't a port here, don't do anything further. 2277ab4382d2SGreg Kroah-Hartman */ 2278ab4382d2SGreg Kroah-Hartman if (!port->iobase && !port->mapbase && !port->membase) 2279ab4382d2SGreg Kroah-Hartman return; 2280ab4382d2SGreg Kroah-Hartman 2281ab4382d2SGreg Kroah-Hartman /* 2282ab4382d2SGreg Kroah-Hartman * Now do the auto configuration stuff. Note that config_port 2283ab4382d2SGreg Kroah-Hartman * is expected to claim the resources and map the port for us. 2284ab4382d2SGreg Kroah-Hartman */ 2285ab4382d2SGreg Kroah-Hartman flags = 0; 2286ab4382d2SGreg Kroah-Hartman if (port->flags & UPF_AUTO_IRQ) 2287ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_IRQ; 2288ab4382d2SGreg Kroah-Hartman if (port->flags & UPF_BOOT_AUTOCONF) { 2289ab4382d2SGreg Kroah-Hartman if (!(port->flags & UPF_FIXED_TYPE)) { 2290ab4382d2SGreg Kroah-Hartman port->type = PORT_UNKNOWN; 2291ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_TYPE; 2292ab4382d2SGreg Kroah-Hartman } 2293ab4382d2SGreg Kroah-Hartman port->ops->config_port(port, flags); 2294ab4382d2SGreg Kroah-Hartman } 2295ab4382d2SGreg Kroah-Hartman 2296ab4382d2SGreg Kroah-Hartman if (port->type != PORT_UNKNOWN) { 2297ab4382d2SGreg Kroah-Hartman unsigned long flags; 2298ab4382d2SGreg Kroah-Hartman 2299ab4382d2SGreg Kroah-Hartman uart_report_port(drv, port); 2300ab4382d2SGreg Kroah-Hartman 2301ab4382d2SGreg Kroah-Hartman /* Power up port for set_mctrl() */ 23026f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2303ab4382d2SGreg Kroah-Hartman 2304ab4382d2SGreg Kroah-Hartman /* 2305ab4382d2SGreg Kroah-Hartman * Ensure that the modem control lines are de-activated. 2306ab4382d2SGreg Kroah-Hartman * keep the DTR setting that is set in uart_set_options() 2307ab4382d2SGreg Kroah-Hartman * We probably don't need a spinlock around this, but 2308ab4382d2SGreg Kroah-Hartman */ 2309ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 2310ab4382d2SGreg Kroah-Hartman port->ops->set_mctrl(port, port->mctrl & TIOCM_DTR); 2311ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 2312ab4382d2SGreg Kroah-Hartman 2313ab4382d2SGreg Kroah-Hartman /* 2314ab4382d2SGreg Kroah-Hartman * If this driver supports console, and it hasn't been 2315ab4382d2SGreg Kroah-Hartman * successfully registered yet, try to re-register it. 2316ab4382d2SGreg Kroah-Hartman * It may be that the port was not available. 2317ab4382d2SGreg Kroah-Hartman */ 2318ab4382d2SGreg Kroah-Hartman if (port->cons && !(port->cons->flags & CON_ENABLED)) 2319ab4382d2SGreg Kroah-Hartman register_console(port->cons); 2320ab4382d2SGreg Kroah-Hartman 2321ab4382d2SGreg Kroah-Hartman /* 2322ab4382d2SGreg Kroah-Hartman * Power down all ports by default, except the 2323ab4382d2SGreg Kroah-Hartman * console if we have one. 2324ab4382d2SGreg Kroah-Hartman */ 2325ab4382d2SGreg Kroah-Hartman if (!uart_console(port)) 23266f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_OFF); 2327ab4382d2SGreg Kroah-Hartman } 2328ab4382d2SGreg Kroah-Hartman } 2329ab4382d2SGreg Kroah-Hartman 2330ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 2331ab4382d2SGreg Kroah-Hartman 2332ab4382d2SGreg Kroah-Hartman static int uart_poll_init(struct tty_driver *driver, int line, char *options) 2333ab4382d2SGreg Kroah-Hartman { 2334ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2335ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 233649c02304SPeter Hurley struct tty_port *tport; 2337ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2338ab4382d2SGreg Kroah-Hartman int baud = 9600; 2339ab4382d2SGreg Kroah-Hartman int bits = 8; 2340ab4382d2SGreg Kroah-Hartman int parity = 'n'; 2341ab4382d2SGreg Kroah-Hartman int flow = 'n'; 234249c02304SPeter Hurley int ret = 0; 2343ab4382d2SGreg Kroah-Hartman 234449c02304SPeter Hurley tport = &state->port; 234549c02304SPeter Hurley mutex_lock(&tport->mutex); 234649c02304SPeter Hurley 23474047b371SPeter Hurley port = uart_port_check(state); 23484047b371SPeter Hurley if (!port || !(port->ops->poll_get_char && port->ops->poll_put_char)) { 234949c02304SPeter Hurley ret = -1; 235049c02304SPeter Hurley goto out; 235149c02304SPeter Hurley } 2352ab4382d2SGreg Kroah-Hartman 2353c7f3e708SAnton Vorontsov if (port->ops->poll_init) { 2354c7f3e708SAnton Vorontsov /* 2355d41861caSPeter Hurley * We don't set initialized as we only initialized the hw, 2356d41861caSPeter Hurley * e.g. state->xmit is still uninitialized. 2357c7f3e708SAnton Vorontsov */ 2358d41861caSPeter Hurley if (!tty_port_initialized(tport)) 2359c7f3e708SAnton Vorontsov ret = port->ops->poll_init(port); 2360c7f3e708SAnton Vorontsov } 2361c7f3e708SAnton Vorontsov 236249c02304SPeter Hurley if (!ret && options) { 2363ab4382d2SGreg Kroah-Hartman uart_parse_options(options, &baud, &parity, &bits, &flow); 236449c02304SPeter Hurley ret = uart_set_options(port, NULL, baud, parity, bits, flow); 2365ab4382d2SGreg Kroah-Hartman } 236649c02304SPeter Hurley out: 236749c02304SPeter Hurley mutex_unlock(&tport->mutex); 236849c02304SPeter Hurley return ret; 2369ab4382d2SGreg Kroah-Hartman } 2370ab4382d2SGreg Kroah-Hartman 2371ab4382d2SGreg Kroah-Hartman static int uart_poll_get_char(struct tty_driver *driver, int line) 2372ab4382d2SGreg Kroah-Hartman { 2373ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2374ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2375ab4382d2SGreg Kroah-Hartman struct uart_port *port; 23769ed19428SPeter Hurley int ret = -1; 2377ab4382d2SGreg Kroah-Hartman 23789ed19428SPeter Hurley port = uart_port_ref(state); 2379ef510beaSAndy Shevchenko if (port) { 23809ed19428SPeter Hurley ret = port->ops->poll_get_char(port); 23819ed19428SPeter Hurley uart_port_deref(port); 23829ed19428SPeter Hurley } 238322077b09SJiri Slaby 23849ed19428SPeter Hurley return ret; 2385ab4382d2SGreg Kroah-Hartman } 2386ab4382d2SGreg Kroah-Hartman 2387ab4382d2SGreg Kroah-Hartman static void uart_poll_put_char(struct tty_driver *driver, int line, char ch) 2388ab4382d2SGreg Kroah-Hartman { 2389ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2390ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2391ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2392ab4382d2SGreg Kroah-Hartman 23939ed19428SPeter Hurley port = uart_port_ref(state); 23949ed19428SPeter Hurley if (!port) 23959ed19428SPeter Hurley return; 2396c7d44a02SDoug Anderson 2397c7d44a02SDoug Anderson if (ch == '\n') 2398c7d44a02SDoug Anderson port->ops->poll_put_char(port, '\r'); 2399ab4382d2SGreg Kroah-Hartman port->ops->poll_put_char(port, ch); 24009ed19428SPeter Hurley uart_port_deref(port); 2401ab4382d2SGreg Kroah-Hartman } 2402ab4382d2SGreg Kroah-Hartman #endif 2403ab4382d2SGreg Kroah-Hartman 2404ab4382d2SGreg Kroah-Hartman static const struct tty_operations uart_ops = { 2405ab4382d2SGreg Kroah-Hartman .open = uart_open, 2406ab4382d2SGreg Kroah-Hartman .close = uart_close, 2407ab4382d2SGreg Kroah-Hartman .write = uart_write, 2408ab4382d2SGreg Kroah-Hartman .put_char = uart_put_char, 2409ab4382d2SGreg Kroah-Hartman .flush_chars = uart_flush_chars, 2410ab4382d2SGreg Kroah-Hartman .write_room = uart_write_room, 2411ab4382d2SGreg Kroah-Hartman .chars_in_buffer= uart_chars_in_buffer, 2412ab4382d2SGreg Kroah-Hartman .flush_buffer = uart_flush_buffer, 2413ab4382d2SGreg Kroah-Hartman .ioctl = uart_ioctl, 2414ab4382d2SGreg Kroah-Hartman .throttle = uart_throttle, 2415ab4382d2SGreg Kroah-Hartman .unthrottle = uart_unthrottle, 2416ab4382d2SGreg Kroah-Hartman .send_xchar = uart_send_xchar, 2417ab4382d2SGreg Kroah-Hartman .set_termios = uart_set_termios, 2418ab4382d2SGreg Kroah-Hartman .set_ldisc = uart_set_ldisc, 2419ab4382d2SGreg Kroah-Hartman .stop = uart_stop, 2420ab4382d2SGreg Kroah-Hartman .start = uart_start, 2421ab4382d2SGreg Kroah-Hartman .hangup = uart_hangup, 2422ab4382d2SGreg Kroah-Hartman .break_ctl = uart_break_ctl, 2423ab4382d2SGreg Kroah-Hartman .wait_until_sent= uart_wait_until_sent, 2424ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_PROC_FS 2425ab4382d2SGreg Kroah-Hartman .proc_fops = &uart_proc_fops, 2426ab4382d2SGreg Kroah-Hartman #endif 2427ab4382d2SGreg Kroah-Hartman .tiocmget = uart_tiocmget, 2428ab4382d2SGreg Kroah-Hartman .tiocmset = uart_tiocmset, 2429ab4382d2SGreg Kroah-Hartman .get_icount = uart_get_icount, 2430ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 2431ab4382d2SGreg Kroah-Hartman .poll_init = uart_poll_init, 2432ab4382d2SGreg Kroah-Hartman .poll_get_char = uart_poll_get_char, 2433ab4382d2SGreg Kroah-Hartman .poll_put_char = uart_poll_put_char, 2434ab4382d2SGreg Kroah-Hartman #endif 2435ab4382d2SGreg Kroah-Hartman }; 2436ab4382d2SGreg Kroah-Hartman 2437ab4382d2SGreg Kroah-Hartman static const struct tty_port_operations uart_port_ops = { 2438ab4382d2SGreg Kroah-Hartman .carrier_raised = uart_carrier_raised, 2439ab4382d2SGreg Kroah-Hartman .dtr_rts = uart_dtr_rts, 2440b3b57646SRob Herring .activate = uart_port_activate, 2441761ed4a9SRob Herring .shutdown = uart_tty_port_shutdown, 2442ab4382d2SGreg Kroah-Hartman }; 2443ab4382d2SGreg Kroah-Hartman 2444ab4382d2SGreg Kroah-Hartman /** 2445ab4382d2SGreg Kroah-Hartman * uart_register_driver - register a driver with the uart core layer 2446ab4382d2SGreg Kroah-Hartman * @drv: low level driver structure 2447ab4382d2SGreg Kroah-Hartman * 2448ab4382d2SGreg Kroah-Hartman * Register a uart driver with the core driver. We in turn register 2449ab4382d2SGreg Kroah-Hartman * with the tty layer, and initialise the core driver per-port state. 2450ab4382d2SGreg Kroah-Hartman * 2451ab4382d2SGreg Kroah-Hartman * We have a proc file in /proc/tty/driver which is named after the 2452ab4382d2SGreg Kroah-Hartman * normal driver. 2453ab4382d2SGreg Kroah-Hartman * 2454ab4382d2SGreg Kroah-Hartman * drv->port should be NULL, and the per-port structures should be 2455ab4382d2SGreg Kroah-Hartman * registered using uart_add_one_port after this call has succeeded. 2456ab4382d2SGreg Kroah-Hartman */ 2457ab4382d2SGreg Kroah-Hartman int uart_register_driver(struct uart_driver *drv) 2458ab4382d2SGreg Kroah-Hartman { 2459ab4382d2SGreg Kroah-Hartman struct tty_driver *normal; 2460ab4382d2SGreg Kroah-Hartman int i, retval; 2461ab4382d2SGreg Kroah-Hartman 2462ab4382d2SGreg Kroah-Hartman BUG_ON(drv->state); 2463ab4382d2SGreg Kroah-Hartman 2464ab4382d2SGreg Kroah-Hartman /* 2465ab4382d2SGreg Kroah-Hartman * Maybe we should be using a slab cache for this, especially if 2466ab4382d2SGreg Kroah-Hartman * we have a large number of ports to handle. 2467ab4382d2SGreg Kroah-Hartman */ 2468ab4382d2SGreg Kroah-Hartman drv->state = kzalloc(sizeof(struct uart_state) * drv->nr, GFP_KERNEL); 2469ab4382d2SGreg Kroah-Hartman if (!drv->state) 2470ab4382d2SGreg Kroah-Hartman goto out; 2471ab4382d2SGreg Kroah-Hartman 2472ab4382d2SGreg Kroah-Hartman normal = alloc_tty_driver(drv->nr); 2473ab4382d2SGreg Kroah-Hartman if (!normal) 2474ab4382d2SGreg Kroah-Hartman goto out_kfree; 2475ab4382d2SGreg Kroah-Hartman 2476ab4382d2SGreg Kroah-Hartman drv->tty_driver = normal; 2477ab4382d2SGreg Kroah-Hartman 2478ab4382d2SGreg Kroah-Hartman normal->driver_name = drv->driver_name; 2479ab4382d2SGreg Kroah-Hartman normal->name = drv->dev_name; 2480ab4382d2SGreg Kroah-Hartman normal->major = drv->major; 2481ab4382d2SGreg Kroah-Hartman normal->minor_start = drv->minor; 2482ab4382d2SGreg Kroah-Hartman normal->type = TTY_DRIVER_TYPE_SERIAL; 2483ab4382d2SGreg Kroah-Hartman normal->subtype = SERIAL_TYPE_NORMAL; 2484ab4382d2SGreg Kroah-Hartman normal->init_termios = tty_std_termios; 2485ab4382d2SGreg Kroah-Hartman normal->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; 2486ab4382d2SGreg Kroah-Hartman normal->init_termios.c_ispeed = normal->init_termios.c_ospeed = 9600; 2487ab4382d2SGreg Kroah-Hartman normal->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; 2488ab4382d2SGreg Kroah-Hartman normal->driver_state = drv; 2489ab4382d2SGreg Kroah-Hartman tty_set_operations(normal, &uart_ops); 2490ab4382d2SGreg Kroah-Hartman 2491ab4382d2SGreg Kroah-Hartman /* 2492ab4382d2SGreg Kroah-Hartman * Initialise the UART state(s). 2493ab4382d2SGreg Kroah-Hartman */ 2494ab4382d2SGreg Kroah-Hartman for (i = 0; i < drv->nr; i++) { 2495ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + i; 2496ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2497ab4382d2SGreg Kroah-Hartman 2498ab4382d2SGreg Kroah-Hartman tty_port_init(port); 2499ab4382d2SGreg Kroah-Hartman port->ops = &uart_port_ops; 2500ab4382d2SGreg Kroah-Hartman } 2501ab4382d2SGreg Kroah-Hartman 2502ab4382d2SGreg Kroah-Hartman retval = tty_register_driver(normal); 2503ab4382d2SGreg Kroah-Hartman if (retval >= 0) 2504ab4382d2SGreg Kroah-Hartman return retval; 2505ab4382d2SGreg Kroah-Hartman 2506191c5f10SJiri Slaby for (i = 0; i < drv->nr; i++) 2507191c5f10SJiri Slaby tty_port_destroy(&drv->state[i].port); 2508ab4382d2SGreg Kroah-Hartman put_tty_driver(normal); 2509ab4382d2SGreg Kroah-Hartman out_kfree: 2510ab4382d2SGreg Kroah-Hartman kfree(drv->state); 2511ab4382d2SGreg Kroah-Hartman out: 2512ab4382d2SGreg Kroah-Hartman return -ENOMEM; 2513ab4382d2SGreg Kroah-Hartman } 2514ab4382d2SGreg Kroah-Hartman 2515ab4382d2SGreg Kroah-Hartman /** 2516ab4382d2SGreg Kroah-Hartman * uart_unregister_driver - remove a driver from the uart core layer 2517ab4382d2SGreg Kroah-Hartman * @drv: low level driver structure 2518ab4382d2SGreg Kroah-Hartman * 2519ab4382d2SGreg Kroah-Hartman * Remove all references to a driver from the core driver. The low 2520ab4382d2SGreg Kroah-Hartman * level driver must have removed all its ports via the 2521ab4382d2SGreg Kroah-Hartman * uart_remove_one_port() if it registered them with uart_add_one_port(). 2522ab4382d2SGreg Kroah-Hartman * (ie, drv->port == NULL) 2523ab4382d2SGreg Kroah-Hartman */ 2524ab4382d2SGreg Kroah-Hartman void uart_unregister_driver(struct uart_driver *drv) 2525ab4382d2SGreg Kroah-Hartman { 2526ab4382d2SGreg Kroah-Hartman struct tty_driver *p = drv->tty_driver; 2527191c5f10SJiri Slaby unsigned int i; 2528191c5f10SJiri Slaby 2529ab4382d2SGreg Kroah-Hartman tty_unregister_driver(p); 2530ab4382d2SGreg Kroah-Hartman put_tty_driver(p); 2531191c5f10SJiri Slaby for (i = 0; i < drv->nr; i++) 2532191c5f10SJiri Slaby tty_port_destroy(&drv->state[i].port); 2533ab4382d2SGreg Kroah-Hartman kfree(drv->state); 25341e66cdedSAlan Cox drv->state = NULL; 2535ab4382d2SGreg Kroah-Hartman drv->tty_driver = NULL; 2536ab4382d2SGreg Kroah-Hartman } 2537ab4382d2SGreg Kroah-Hartman 2538ab4382d2SGreg Kroah-Hartman struct tty_driver *uart_console_device(struct console *co, int *index) 2539ab4382d2SGreg Kroah-Hartman { 2540ab4382d2SGreg Kroah-Hartman struct uart_driver *p = co->data; 2541ab4382d2SGreg Kroah-Hartman *index = co->index; 2542ab4382d2SGreg Kroah-Hartman return p->tty_driver; 2543ab4382d2SGreg Kroah-Hartman } 2544ab4382d2SGreg Kroah-Hartman 25456915c0e4STomas Hlavacek static ssize_t uart_get_attr_uartclk(struct device *dev, 25466915c0e4STomas Hlavacek struct device_attribute *attr, char *buf) 25476915c0e4STomas Hlavacek { 2548bebe73e3SAlan Cox struct serial_struct tmp; 25496915c0e4STomas Hlavacek struct tty_port *port = dev_get_drvdata(dev); 2550b1b79916STomas Hlavacek 25519f109694SAlan Cox uart_get_info(port, &tmp); 2552bebe73e3SAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.baud_base * 16); 25536915c0e4STomas Hlavacek } 25546915c0e4STomas Hlavacek 2555373bac4cSAlan Cox static ssize_t uart_get_attr_type(struct device *dev, 2556373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2557373bac4cSAlan Cox { 2558373bac4cSAlan Cox struct serial_struct tmp; 2559373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2560373bac4cSAlan Cox 2561373bac4cSAlan Cox uart_get_info(port, &tmp); 2562373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.type); 2563373bac4cSAlan Cox } 2564373bac4cSAlan Cox static ssize_t uart_get_attr_line(struct device *dev, 2565373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2566373bac4cSAlan Cox { 2567373bac4cSAlan Cox struct serial_struct tmp; 2568373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2569373bac4cSAlan Cox 2570373bac4cSAlan Cox uart_get_info(port, &tmp); 2571373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.line); 2572373bac4cSAlan Cox } 2573373bac4cSAlan Cox 2574373bac4cSAlan Cox static ssize_t uart_get_attr_port(struct device *dev, 2575373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2576373bac4cSAlan Cox { 2577373bac4cSAlan Cox struct serial_struct tmp; 2578373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2579fd985e1dSAndrew Morton unsigned long ioaddr; 2580373bac4cSAlan Cox 2581373bac4cSAlan Cox uart_get_info(port, &tmp); 2582fd985e1dSAndrew Morton ioaddr = tmp.port; 2583fd985e1dSAndrew Morton if (HIGH_BITS_OFFSET) 2584fd985e1dSAndrew Morton ioaddr |= (unsigned long)tmp.port_high << HIGH_BITS_OFFSET; 2585fd985e1dSAndrew Morton return snprintf(buf, PAGE_SIZE, "0x%lX\n", ioaddr); 2586373bac4cSAlan Cox } 2587373bac4cSAlan Cox 2588373bac4cSAlan Cox static ssize_t uart_get_attr_irq(struct device *dev, 2589373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2590373bac4cSAlan Cox { 2591373bac4cSAlan Cox struct serial_struct tmp; 2592373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2593373bac4cSAlan Cox 2594373bac4cSAlan Cox uart_get_info(port, &tmp); 2595373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.irq); 2596373bac4cSAlan Cox } 2597373bac4cSAlan Cox 2598373bac4cSAlan Cox static ssize_t uart_get_attr_flags(struct device *dev, 2599373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2600373bac4cSAlan Cox { 2601373bac4cSAlan Cox struct serial_struct tmp; 2602373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2603373bac4cSAlan Cox 2604373bac4cSAlan Cox uart_get_info(port, &tmp); 2605373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "0x%X\n", tmp.flags); 2606373bac4cSAlan Cox } 2607373bac4cSAlan Cox 2608373bac4cSAlan Cox static ssize_t uart_get_attr_xmit_fifo_size(struct device *dev, 2609373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2610373bac4cSAlan Cox { 2611373bac4cSAlan Cox struct serial_struct tmp; 2612373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2613373bac4cSAlan Cox 2614373bac4cSAlan Cox uart_get_info(port, &tmp); 2615373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.xmit_fifo_size); 2616373bac4cSAlan Cox } 2617373bac4cSAlan Cox 2618373bac4cSAlan Cox 2619373bac4cSAlan Cox static ssize_t uart_get_attr_close_delay(struct device *dev, 2620373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2621373bac4cSAlan Cox { 2622373bac4cSAlan Cox struct serial_struct tmp; 2623373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2624373bac4cSAlan Cox 2625373bac4cSAlan Cox uart_get_info(port, &tmp); 2626373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.close_delay); 2627373bac4cSAlan Cox } 2628373bac4cSAlan Cox 2629373bac4cSAlan Cox 2630373bac4cSAlan Cox static ssize_t uart_get_attr_closing_wait(struct device *dev, 2631373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2632373bac4cSAlan Cox { 2633373bac4cSAlan Cox struct serial_struct tmp; 2634373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2635373bac4cSAlan Cox 2636373bac4cSAlan Cox uart_get_info(port, &tmp); 2637373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.closing_wait); 2638373bac4cSAlan Cox } 2639373bac4cSAlan Cox 2640373bac4cSAlan Cox static ssize_t uart_get_attr_custom_divisor(struct device *dev, 2641373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2642373bac4cSAlan Cox { 2643373bac4cSAlan Cox struct serial_struct tmp; 2644373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2645373bac4cSAlan Cox 2646373bac4cSAlan Cox uart_get_info(port, &tmp); 2647373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.custom_divisor); 2648373bac4cSAlan Cox } 2649373bac4cSAlan Cox 2650373bac4cSAlan Cox static ssize_t uart_get_attr_io_type(struct device *dev, 2651373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2652373bac4cSAlan Cox { 2653373bac4cSAlan Cox struct serial_struct tmp; 2654373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2655373bac4cSAlan Cox 2656373bac4cSAlan Cox uart_get_info(port, &tmp); 2657373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.io_type); 2658373bac4cSAlan Cox } 2659373bac4cSAlan Cox 2660373bac4cSAlan Cox static ssize_t uart_get_attr_iomem_base(struct device *dev, 2661373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2662373bac4cSAlan Cox { 2663373bac4cSAlan Cox struct serial_struct tmp; 2664373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2665373bac4cSAlan Cox 2666373bac4cSAlan Cox uart_get_info(port, &tmp); 2667373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "0x%lX\n", (unsigned long)tmp.iomem_base); 2668373bac4cSAlan Cox } 2669373bac4cSAlan Cox 2670373bac4cSAlan Cox static ssize_t uart_get_attr_iomem_reg_shift(struct device *dev, 2671373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2672373bac4cSAlan Cox { 2673373bac4cSAlan Cox struct serial_struct tmp; 2674373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2675373bac4cSAlan Cox 2676373bac4cSAlan Cox uart_get_info(port, &tmp); 2677373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.iomem_reg_shift); 2678373bac4cSAlan Cox } 2679373bac4cSAlan Cox 2680373bac4cSAlan Cox static DEVICE_ATTR(type, S_IRUSR | S_IRGRP, uart_get_attr_type, NULL); 2681373bac4cSAlan Cox static DEVICE_ATTR(line, S_IRUSR | S_IRGRP, uart_get_attr_line, NULL); 2682373bac4cSAlan Cox static DEVICE_ATTR(port, S_IRUSR | S_IRGRP, uart_get_attr_port, NULL); 2683373bac4cSAlan Cox static DEVICE_ATTR(irq, S_IRUSR | S_IRGRP, uart_get_attr_irq, NULL); 2684373bac4cSAlan Cox static DEVICE_ATTR(flags, S_IRUSR | S_IRGRP, uart_get_attr_flags, NULL); 2685373bac4cSAlan Cox static DEVICE_ATTR(xmit_fifo_size, S_IRUSR | S_IRGRP, uart_get_attr_xmit_fifo_size, NULL); 26866915c0e4STomas Hlavacek static DEVICE_ATTR(uartclk, S_IRUSR | S_IRGRP, uart_get_attr_uartclk, NULL); 2687373bac4cSAlan Cox static DEVICE_ATTR(close_delay, S_IRUSR | S_IRGRP, uart_get_attr_close_delay, NULL); 2688373bac4cSAlan Cox static DEVICE_ATTR(closing_wait, S_IRUSR | S_IRGRP, uart_get_attr_closing_wait, NULL); 2689373bac4cSAlan Cox static DEVICE_ATTR(custom_divisor, S_IRUSR | S_IRGRP, uart_get_attr_custom_divisor, NULL); 2690373bac4cSAlan Cox static DEVICE_ATTR(io_type, S_IRUSR | S_IRGRP, uart_get_attr_io_type, NULL); 2691373bac4cSAlan Cox static DEVICE_ATTR(iomem_base, S_IRUSR | S_IRGRP, uart_get_attr_iomem_base, NULL); 2692373bac4cSAlan Cox static DEVICE_ATTR(iomem_reg_shift, S_IRUSR | S_IRGRP, uart_get_attr_iomem_reg_shift, NULL); 26936915c0e4STomas Hlavacek 26946915c0e4STomas Hlavacek static struct attribute *tty_dev_attrs[] = { 2695373bac4cSAlan Cox &dev_attr_type.attr, 2696373bac4cSAlan Cox &dev_attr_line.attr, 2697373bac4cSAlan Cox &dev_attr_port.attr, 2698373bac4cSAlan Cox &dev_attr_irq.attr, 2699373bac4cSAlan Cox &dev_attr_flags.attr, 2700373bac4cSAlan Cox &dev_attr_xmit_fifo_size.attr, 27016915c0e4STomas Hlavacek &dev_attr_uartclk.attr, 2702373bac4cSAlan Cox &dev_attr_close_delay.attr, 2703373bac4cSAlan Cox &dev_attr_closing_wait.attr, 2704373bac4cSAlan Cox &dev_attr_custom_divisor.attr, 2705373bac4cSAlan Cox &dev_attr_io_type.attr, 2706373bac4cSAlan Cox &dev_attr_iomem_base.attr, 2707373bac4cSAlan Cox &dev_attr_iomem_reg_shift.attr, 27086915c0e4STomas Hlavacek NULL, 27096915c0e4STomas Hlavacek }; 27106915c0e4STomas Hlavacek 2711b1b79916STomas Hlavacek static const struct attribute_group tty_dev_attr_group = { 27126915c0e4STomas Hlavacek .attrs = tty_dev_attrs, 27136915c0e4STomas Hlavacek }; 27146915c0e4STomas Hlavacek 2715ab4382d2SGreg Kroah-Hartman /** 2716ab4382d2SGreg Kroah-Hartman * uart_add_one_port - attach a driver-defined port structure 2717ab4382d2SGreg Kroah-Hartman * @drv: pointer to the uart low level driver structure for this port 2718ab4382d2SGreg Kroah-Hartman * @uport: uart port structure to use for this port. 2719ab4382d2SGreg Kroah-Hartman * 2720ab4382d2SGreg Kroah-Hartman * This allows the driver to register its own uart_port structure 2721ab4382d2SGreg Kroah-Hartman * with the core driver. The main purpose is to allow the low 2722ab4382d2SGreg Kroah-Hartman * level uart drivers to expand uart_port, rather than having yet 2723ab4382d2SGreg Kroah-Hartman * more levels of structures. 2724ab4382d2SGreg Kroah-Hartman */ 2725ab4382d2SGreg Kroah-Hartman int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport) 2726ab4382d2SGreg Kroah-Hartman { 2727ab4382d2SGreg Kroah-Hartman struct uart_state *state; 2728ab4382d2SGreg Kroah-Hartman struct tty_port *port; 2729ab4382d2SGreg Kroah-Hartman int ret = 0; 2730ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 2731266dcff0SGreg Kroah-Hartman int num_groups; 2732ab4382d2SGreg Kroah-Hartman 2733ab4382d2SGreg Kroah-Hartman BUG_ON(in_interrupt()); 2734ab4382d2SGreg Kroah-Hartman 2735ab4382d2SGreg Kroah-Hartman if (uport->line >= drv->nr) 2736ab4382d2SGreg Kroah-Hartman return -EINVAL; 2737ab4382d2SGreg Kroah-Hartman 2738ab4382d2SGreg Kroah-Hartman state = drv->state + uport->line; 2739ab4382d2SGreg Kroah-Hartman port = &state->port; 2740ab4382d2SGreg Kroah-Hartman 2741ab4382d2SGreg Kroah-Hartman mutex_lock(&port_mutex); 2742ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2743ab4382d2SGreg Kroah-Hartman if (state->uart_port) { 2744ab4382d2SGreg Kroah-Hartman ret = -EINVAL; 2745ab4382d2SGreg Kroah-Hartman goto out; 2746ab4382d2SGreg Kroah-Hartman } 2747ab4382d2SGreg Kroah-Hartman 27482b702b9bSPeter Hurley /* Link the port to the driver state table and vice versa */ 27499ed19428SPeter Hurley atomic_set(&state->refcount, 1); 27509ed19428SPeter Hurley init_waitqueue_head(&state->remove_wait); 2751ab4382d2SGreg Kroah-Hartman state->uart_port = uport; 2752ab4382d2SGreg Kroah-Hartman uport->state = state; 2753ab4382d2SGreg Kroah-Hartman 27542b702b9bSPeter Hurley state->pm_state = UART_PM_STATE_UNDEFINED; 27552b702b9bSPeter Hurley uport->cons = drv->cons; 2756959801feSPeter Hurley uport->minor = drv->tty_driver->minor_start + uport->line; 2757f7048b15SVignesh R uport->name = kasprintf(GFP_KERNEL, "%s%d", drv->dev_name, 2758f7048b15SVignesh R drv->tty_driver->name_base + uport->line); 2759f7048b15SVignesh R if (!uport->name) { 2760f7048b15SVignesh R ret = -ENOMEM; 2761f7048b15SVignesh R goto out; 2762f7048b15SVignesh R } 27632b702b9bSPeter Hurley 2764ab4382d2SGreg Kroah-Hartman /* 2765ab4382d2SGreg Kroah-Hartman * If this port is a console, then the spinlock is already 2766ab4382d2SGreg Kroah-Hartman * initialised. 2767ab4382d2SGreg Kroah-Hartman */ 2768ab4382d2SGreg Kroah-Hartman if (!(uart_console(uport) && (uport->cons->flags & CON_ENABLED))) { 2769ab4382d2SGreg Kroah-Hartman spin_lock_init(&uport->lock); 2770ab4382d2SGreg Kroah-Hartman lockdep_set_class(&uport->lock, &port_lock_key); 2771ab4382d2SGreg Kroah-Hartman } 2772a208ffd2SGrant Likely if (uport->cons && uport->dev) 2773a208ffd2SGrant Likely of_console_check(uport->dev->of_node, uport->cons->name, uport->line); 2774ab4382d2SGreg Kroah-Hartman 2775ab4382d2SGreg Kroah-Hartman uart_configure_port(drv, state, uport); 2776ab4382d2SGreg Kroah-Hartman 27774dda864dSGeert Uytterhoeven port->console = uart_console(uport); 27784dda864dSGeert Uytterhoeven 2779266dcff0SGreg Kroah-Hartman num_groups = 2; 2780266dcff0SGreg Kroah-Hartman if (uport->attr_group) 2781266dcff0SGreg Kroah-Hartman num_groups++; 2782266dcff0SGreg Kroah-Hartman 2783c2b703b8SYoshihiro YUNOMAE uport->tty_groups = kcalloc(num_groups, sizeof(*uport->tty_groups), 2784266dcff0SGreg Kroah-Hartman GFP_KERNEL); 2785266dcff0SGreg Kroah-Hartman if (!uport->tty_groups) { 2786266dcff0SGreg Kroah-Hartman ret = -ENOMEM; 2787266dcff0SGreg Kroah-Hartman goto out; 2788266dcff0SGreg Kroah-Hartman } 2789266dcff0SGreg Kroah-Hartman uport->tty_groups[0] = &tty_dev_attr_group; 2790266dcff0SGreg Kroah-Hartman if (uport->attr_group) 2791266dcff0SGreg Kroah-Hartman uport->tty_groups[1] = uport->attr_group; 2792266dcff0SGreg Kroah-Hartman 2793ab4382d2SGreg Kroah-Hartman /* 2794ab4382d2SGreg Kroah-Hartman * Register the port whether it's detected or not. This allows 2795015355b7SGeert Uytterhoeven * setserial to be used to alter this port's parameters. 2796ab4382d2SGreg Kroah-Hartman */ 2797da4c2799SJohan Hovold tty_dev = tty_port_register_device_attr_serdev(port, drv->tty_driver, 2798266dcff0SGreg Kroah-Hartman uport->line, uport->dev, port, uport->tty_groups); 2799ab4382d2SGreg Kroah-Hartman if (likely(!IS_ERR(tty_dev))) { 280077359835SSimon Glass device_set_wakeup_capable(tty_dev, 1); 280177359835SSimon Glass } else { 28022f2dafe7SSudip Mukherjee dev_err(uport->dev, "Cannot register tty device on line %d\n", 2803ab4382d2SGreg Kroah-Hartman uport->line); 280477359835SSimon Glass } 2805ab4382d2SGreg Kroah-Hartman 2806ab4382d2SGreg Kroah-Hartman /* 2807ab4382d2SGreg Kroah-Hartman * Ensure UPF_DEAD is not set. 2808ab4382d2SGreg Kroah-Hartman */ 2809ab4382d2SGreg Kroah-Hartman uport->flags &= ~UPF_DEAD; 2810ab4382d2SGreg Kroah-Hartman 2811ab4382d2SGreg Kroah-Hartman out: 2812ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2813ab4382d2SGreg Kroah-Hartman mutex_unlock(&port_mutex); 2814ab4382d2SGreg Kroah-Hartman 2815ab4382d2SGreg Kroah-Hartman return ret; 2816ab4382d2SGreg Kroah-Hartman } 2817ab4382d2SGreg Kroah-Hartman 2818ab4382d2SGreg Kroah-Hartman /** 2819ab4382d2SGreg Kroah-Hartman * uart_remove_one_port - detach a driver defined port structure 2820ab4382d2SGreg Kroah-Hartman * @drv: pointer to the uart low level driver structure for this port 2821ab4382d2SGreg Kroah-Hartman * @uport: uart port structure for this port 2822ab4382d2SGreg Kroah-Hartman * 2823ab4382d2SGreg Kroah-Hartman * This unhooks (and hangs up) the specified port structure from the 2824ab4382d2SGreg Kroah-Hartman * core driver. No further calls will be made to the low-level code 2825ab4382d2SGreg Kroah-Hartman * for this port. 2826ab4382d2SGreg Kroah-Hartman */ 2827ab4382d2SGreg Kroah-Hartman int uart_remove_one_port(struct uart_driver *drv, struct uart_port *uport) 2828ab4382d2SGreg Kroah-Hartman { 2829ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 2830ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 28314047b371SPeter Hurley struct uart_port *uart_port; 28324c6d5b4dSGeert Uytterhoeven struct tty_struct *tty; 2833b342dd51SChen Gang int ret = 0; 2834ab4382d2SGreg Kroah-Hartman 2835ab4382d2SGreg Kroah-Hartman BUG_ON(in_interrupt()); 2836ab4382d2SGreg Kroah-Hartman 2837ab4382d2SGreg Kroah-Hartman mutex_lock(&port_mutex); 2838ab4382d2SGreg Kroah-Hartman 2839ab4382d2SGreg Kroah-Hartman /* 2840ab4382d2SGreg Kroah-Hartman * Mark the port "dead" - this prevents any opens from 2841ab4382d2SGreg Kroah-Hartman * succeeding while we shut down the port. 2842ab4382d2SGreg Kroah-Hartman */ 2843ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 28444047b371SPeter Hurley uart_port = uart_port_check(state); 28454047b371SPeter Hurley if (uart_port != uport) 28464047b371SPeter Hurley dev_alert(uport->dev, "Removing wrong port: %p != %p\n", 28474047b371SPeter Hurley uart_port, uport); 28484047b371SPeter Hurley 28494047b371SPeter Hurley if (!uart_port) { 2850b342dd51SChen Gang mutex_unlock(&port->mutex); 2851b342dd51SChen Gang ret = -EINVAL; 2852b342dd51SChen Gang goto out; 2853b342dd51SChen Gang } 2854ab4382d2SGreg Kroah-Hartman uport->flags |= UPF_DEAD; 2855ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2856ab4382d2SGreg Kroah-Hartman 2857ab4382d2SGreg Kroah-Hartman /* 2858ab4382d2SGreg Kroah-Hartman * Remove the devices from the tty layer 2859ab4382d2SGreg Kroah-Hartman */ 2860da4c2799SJohan Hovold tty_port_unregister_device(port, drv->tty_driver, uport->line); 2861ab4382d2SGreg Kroah-Hartman 28624c6d5b4dSGeert Uytterhoeven tty = tty_port_tty_get(port); 28634c6d5b4dSGeert Uytterhoeven if (tty) { 2864ab4382d2SGreg Kroah-Hartman tty_vhangup(port->tty); 28654c6d5b4dSGeert Uytterhoeven tty_kref_put(tty); 28664c6d5b4dSGeert Uytterhoeven } 2867ab4382d2SGreg Kroah-Hartman 2868ab4382d2SGreg Kroah-Hartman /* 28695f5c9ae5SGeert Uytterhoeven * If the port is used as a console, unregister it 28705f5c9ae5SGeert Uytterhoeven */ 28715f5c9ae5SGeert Uytterhoeven if (uart_console(uport)) 28725f5c9ae5SGeert Uytterhoeven unregister_console(uport->cons); 28735f5c9ae5SGeert Uytterhoeven 28745f5c9ae5SGeert Uytterhoeven /* 2875ab4382d2SGreg Kroah-Hartman * Free the port IO and memory resources, if any. 2876ab4382d2SGreg Kroah-Hartman */ 2877a7cfaf16SFabio Estevam if (uport->type != PORT_UNKNOWN && uport->ops->release_port) 2878ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 2879266dcff0SGreg Kroah-Hartman kfree(uport->tty_groups); 2880f7048b15SVignesh R kfree(uport->name); 2881ab4382d2SGreg Kroah-Hartman 2882ab4382d2SGreg Kroah-Hartman /* 2883ab4382d2SGreg Kroah-Hartman * Indicate that there isn't a port here anymore. 2884ab4382d2SGreg Kroah-Hartman */ 2885ab4382d2SGreg Kroah-Hartman uport->type = PORT_UNKNOWN; 2886ab4382d2SGreg Kroah-Hartman 28874047b371SPeter Hurley mutex_lock(&port->mutex); 28889ed19428SPeter Hurley WARN_ON(atomic_dec_return(&state->refcount) < 0); 28899ed19428SPeter Hurley wait_event(state->remove_wait, !atomic_read(&state->refcount)); 2890ab4382d2SGreg Kroah-Hartman state->uart_port = NULL; 28914047b371SPeter Hurley mutex_unlock(&port->mutex); 2892b342dd51SChen Gang out: 2893ab4382d2SGreg Kroah-Hartman mutex_unlock(&port_mutex); 2894ab4382d2SGreg Kroah-Hartman 2895b342dd51SChen Gang return ret; 2896ab4382d2SGreg Kroah-Hartman } 2897ab4382d2SGreg Kroah-Hartman 2898ab4382d2SGreg Kroah-Hartman /* 2899ab4382d2SGreg Kroah-Hartman * Are the two ports equivalent? 2900ab4382d2SGreg Kroah-Hartman */ 2901ab4382d2SGreg Kroah-Hartman int uart_match_port(struct uart_port *port1, struct uart_port *port2) 2902ab4382d2SGreg Kroah-Hartman { 2903ab4382d2SGreg Kroah-Hartman if (port1->iotype != port2->iotype) 2904ab4382d2SGreg Kroah-Hartman return 0; 2905ab4382d2SGreg Kroah-Hartman 2906ab4382d2SGreg Kroah-Hartman switch (port1->iotype) { 2907ab4382d2SGreg Kroah-Hartman case UPIO_PORT: 2908ab4382d2SGreg Kroah-Hartman return (port1->iobase == port2->iobase); 2909ab4382d2SGreg Kroah-Hartman case UPIO_HUB6: 2910ab4382d2SGreg Kroah-Hartman return (port1->iobase == port2->iobase) && 2911ab4382d2SGreg Kroah-Hartman (port1->hub6 == port2->hub6); 2912ab4382d2SGreg Kroah-Hartman case UPIO_MEM: 2913bd94c407SMasahiro Yamada case UPIO_MEM16: 2914ab4382d2SGreg Kroah-Hartman case UPIO_MEM32: 29153ffb1a81SKevin Cernekee case UPIO_MEM32BE: 2916ab4382d2SGreg Kroah-Hartman case UPIO_AU: 2917ab4382d2SGreg Kroah-Hartman case UPIO_TSI: 2918ab4382d2SGreg Kroah-Hartman return (port1->mapbase == port2->mapbase); 2919ab4382d2SGreg Kroah-Hartman } 2920ab4382d2SGreg Kroah-Hartman return 0; 2921ab4382d2SGreg Kroah-Hartman } 2922ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_match_port); 2923ab4382d2SGreg Kroah-Hartman 2924027d7dacSJiri Slaby /** 2925027d7dacSJiri Slaby * uart_handle_dcd_change - handle a change of carrier detect state 2926027d7dacSJiri Slaby * @uport: uart_port structure for the open port 2927027d7dacSJiri Slaby * @status: new carrier detect status, nonzero if active 29284d90bb14SPeter Hurley * 29294d90bb14SPeter Hurley * Caller must hold uport->lock 2930027d7dacSJiri Slaby */ 2931027d7dacSJiri Slaby void uart_handle_dcd_change(struct uart_port *uport, unsigned int status) 2932027d7dacSJiri Slaby { 293342381572SGeorge Spelvin struct tty_port *port = &uport->state->port; 293443eca0aeSAlan Cox struct tty_struct *tty = port->tty; 2935c993257bSPeter Hurley struct tty_ldisc *ld; 2936027d7dacSJiri Slaby 29374d90bb14SPeter Hurley lockdep_assert_held_once(&uport->lock); 29384d90bb14SPeter Hurley 2939c993257bSPeter Hurley if (tty) { 2940c993257bSPeter Hurley ld = tty_ldisc_ref(tty); 294142381572SGeorge Spelvin if (ld) { 294242381572SGeorge Spelvin if (ld->ops->dcd_change) 2943593fb1aeSGeorge Spelvin ld->ops->dcd_change(tty, status); 294442381572SGeorge Spelvin tty_ldisc_deref(ld); 294542381572SGeorge Spelvin } 2946c993257bSPeter Hurley } 2947027d7dacSJiri Slaby 2948027d7dacSJiri Slaby uport->icount.dcd++; 2949027d7dacSJiri Slaby 2950299245a1SPeter Hurley if (uart_dcd_enabled(uport)) { 2951027d7dacSJiri Slaby if (status) 2952027d7dacSJiri Slaby wake_up_interruptible(&port->open_wait); 295343eca0aeSAlan Cox else if (tty) 295443eca0aeSAlan Cox tty_hangup(tty); 2955027d7dacSJiri Slaby } 2956027d7dacSJiri Slaby } 2957027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_handle_dcd_change); 2958027d7dacSJiri Slaby 2959027d7dacSJiri Slaby /** 2960027d7dacSJiri Slaby * uart_handle_cts_change - handle a change of clear-to-send state 2961027d7dacSJiri Slaby * @uport: uart_port structure for the open port 2962027d7dacSJiri Slaby * @status: new clear to send status, nonzero if active 29634d90bb14SPeter Hurley * 29644d90bb14SPeter Hurley * Caller must hold uport->lock 2965027d7dacSJiri Slaby */ 2966027d7dacSJiri Slaby void uart_handle_cts_change(struct uart_port *uport, unsigned int status) 2967027d7dacSJiri Slaby { 29684d90bb14SPeter Hurley lockdep_assert_held_once(&uport->lock); 29694d90bb14SPeter Hurley 2970027d7dacSJiri Slaby uport->icount.cts++; 2971027d7dacSJiri Slaby 2972391f93f2SPeter Hurley if (uart_softcts_mode(uport)) { 2973d01f4d18SPeter Hurley if (uport->hw_stopped) { 2974027d7dacSJiri Slaby if (status) { 2975d01f4d18SPeter Hurley uport->hw_stopped = 0; 2976027d7dacSJiri Slaby uport->ops->start_tx(uport); 2977027d7dacSJiri Slaby uart_write_wakeup(uport); 2978027d7dacSJiri Slaby } 2979027d7dacSJiri Slaby } else { 2980027d7dacSJiri Slaby if (!status) { 2981d01f4d18SPeter Hurley uport->hw_stopped = 1; 2982027d7dacSJiri Slaby uport->ops->stop_tx(uport); 2983027d7dacSJiri Slaby } 2984027d7dacSJiri Slaby } 2985391f93f2SPeter Hurley 2986027d7dacSJiri Slaby } 2987027d7dacSJiri Slaby } 2988027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_handle_cts_change); 2989027d7dacSJiri Slaby 2990cf75525fSJiri Slaby /** 2991cf75525fSJiri Slaby * uart_insert_char - push a char to the uart layer 2992cf75525fSJiri Slaby * 2993cf75525fSJiri Slaby * User is responsible to call tty_flip_buffer_push when they are done with 2994cf75525fSJiri Slaby * insertion. 2995cf75525fSJiri Slaby * 2996cf75525fSJiri Slaby * @port: corresponding port 2997cf75525fSJiri Slaby * @status: state of the serial port RX buffer (LSR for 8250) 2998cf75525fSJiri Slaby * @overrun: mask of overrun bits in @status 2999cf75525fSJiri Slaby * @ch: character to push 3000cf75525fSJiri Slaby * @flag: flag for the character (see TTY_NORMAL and friends) 3001cf75525fSJiri Slaby */ 3002027d7dacSJiri Slaby void uart_insert_char(struct uart_port *port, unsigned int status, 3003027d7dacSJiri Slaby unsigned int overrun, unsigned int ch, unsigned int flag) 3004027d7dacSJiri Slaby { 300592a19f9cSJiri Slaby struct tty_port *tport = &port->state->port; 3006027d7dacSJiri Slaby 3007027d7dacSJiri Slaby if ((status & port->ignore_status_mask & ~overrun) == 0) 300892a19f9cSJiri Slaby if (tty_insert_flip_char(tport, ch, flag) == 0) 3009dabfb351SCorbin ++port->icount.buf_overrun; 3010027d7dacSJiri Slaby 3011027d7dacSJiri Slaby /* 3012027d7dacSJiri Slaby * Overrun is special. Since it's reported immediately, 3013027d7dacSJiri Slaby * it doesn't affect the current character. 3014027d7dacSJiri Slaby */ 3015027d7dacSJiri Slaby if (status & ~port->ignore_status_mask & overrun) 301692a19f9cSJiri Slaby if (tty_insert_flip_char(tport, 0, TTY_OVERRUN) == 0) 3017dabfb351SCorbin ++port->icount.buf_overrun; 3018027d7dacSJiri Slaby } 3019027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_insert_char); 3020027d7dacSJiri Slaby 3021ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_write_wakeup); 3022ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_register_driver); 3023ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_unregister_driver); 3024ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_suspend_port); 3025ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_resume_port); 3026ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_add_one_port); 3027ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_remove_one_port); 3028ab4382d2SGreg Kroah-Hartman 3029ef838a81SUwe Kleine-König /** 3030ef838a81SUwe Kleine-König * of_get_rs485_mode() - Implement parsing rs485 properties 3031ef838a81SUwe Kleine-König * @np: uart node 3032ef838a81SUwe Kleine-König * @rs485conf: output parameter 3033ef838a81SUwe Kleine-König * 3034ef838a81SUwe Kleine-König * This function implements the device tree binding described in 3035ef838a81SUwe Kleine-König * Documentation/devicetree/bindings/serial/rs485.txt. 3036ef838a81SUwe Kleine-König */ 3037ef838a81SUwe Kleine-König void of_get_rs485_mode(struct device_node *np, struct serial_rs485 *rs485conf) 3038ef838a81SUwe Kleine-König { 3039ef838a81SUwe Kleine-König u32 rs485_delay[2]; 3040ef838a81SUwe Kleine-König int ret; 3041ef838a81SUwe Kleine-König 3042ef838a81SUwe Kleine-König ret = of_property_read_u32_array(np, "rs485-rts-delay", rs485_delay, 2); 3043ef838a81SUwe Kleine-König if (!ret) { 3044ef838a81SUwe Kleine-König rs485conf->delay_rts_before_send = rs485_delay[0]; 3045ef838a81SUwe Kleine-König rs485conf->delay_rts_after_send = rs485_delay[1]; 3046ef838a81SUwe Kleine-König } else { 3047ef838a81SUwe Kleine-König rs485conf->delay_rts_before_send = 0; 3048ef838a81SUwe Kleine-König rs485conf->delay_rts_after_send = 0; 3049ef838a81SUwe Kleine-König } 3050ef838a81SUwe Kleine-König 3051ef838a81SUwe Kleine-König /* 3052ef838a81SUwe Kleine-König * clear full-duplex and enabled flags to get to a defined state with 3053ef838a81SUwe Kleine-König * the two following properties. 3054ef838a81SUwe Kleine-König */ 3055ef838a81SUwe Kleine-König rs485conf->flags &= ~(SER_RS485_RX_DURING_TX | SER_RS485_ENABLED); 3056ef838a81SUwe Kleine-König 3057ef838a81SUwe Kleine-König if (of_property_read_bool(np, "rs485-rx-during-tx")) 3058ef838a81SUwe Kleine-König rs485conf->flags |= SER_RS485_RX_DURING_TX; 3059ef838a81SUwe Kleine-König 3060ef838a81SUwe Kleine-König if (of_property_read_bool(np, "linux,rs485-enabled-at-boot-time")) 3061ef838a81SUwe Kleine-König rs485conf->flags |= SER_RS485_ENABLED; 3062ef838a81SUwe Kleine-König } 3063ef838a81SUwe Kleine-König EXPORT_SYMBOL_GPL(of_get_rs485_mode); 3064ef838a81SUwe Kleine-König 3065ab4382d2SGreg Kroah-Hartman MODULE_DESCRIPTION("Serial driver core"); 3066ab4382d2SGreg Kroah-Hartman MODULE_LICENSE("GPL"); 3067