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 #include <linux/module.h> 11ab4382d2SGreg Kroah-Hartman #include <linux/tty.h> 12027d7dacSJiri Slaby #include <linux/tty_flip.h> 13ab4382d2SGreg Kroah-Hartman #include <linux/slab.h> 14174cd4b1SIngo Molnar #include <linux/sched/signal.h> 15ab4382d2SGreg Kroah-Hartman #include <linux/init.h> 16ab4382d2SGreg Kroah-Hartman #include <linux/console.h> 17a208ffd2SGrant Likely #include <linux/of.h> 18ab4382d2SGreg Kroah-Hartman #include <linux/proc_fs.h> 19ab4382d2SGreg Kroah-Hartman #include <linux/seq_file.h> 20ab4382d2SGreg Kroah-Hartman #include <linux/device.h> 21ab4382d2SGreg Kroah-Hartman #include <linux/serial.h> /* for serial_state and serial_icounter_struct */ 22ab4382d2SGreg Kroah-Hartman #include <linux/serial_core.h> 23ab4382d2SGreg Kroah-Hartman #include <linux/delay.h> 24ab4382d2SGreg Kroah-Hartman #include <linux/mutex.h> 25ab4382d2SGreg Kroah-Hartman 26aef3ad10SAndy Shevchenko #include <linux/irq.h> 277c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 28ab4382d2SGreg Kroah-Hartman 29ab4382d2SGreg Kroah-Hartman /* 30ab4382d2SGreg Kroah-Hartman * This is used to lock changes in serial line configuration. 31ab4382d2SGreg Kroah-Hartman */ 32ab4382d2SGreg Kroah-Hartman static DEFINE_MUTEX(port_mutex); 33ab4382d2SGreg Kroah-Hartman 34ab4382d2SGreg Kroah-Hartman /* 35ab4382d2SGreg Kroah-Hartman * lockdep: port->lock is initialized in two places, but we 36ab4382d2SGreg Kroah-Hartman * want only one lock-class: 37ab4382d2SGreg Kroah-Hartman */ 38ab4382d2SGreg Kroah-Hartman static struct lock_class_key port_lock_key; 39ab4382d2SGreg Kroah-Hartman 40ab4382d2SGreg Kroah-Hartman #define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8) 41ab4382d2SGreg Kroah-Hartman 42ab4382d2SGreg Kroah-Hartman static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, 43ab4382d2SGreg Kroah-Hartman struct ktermios *old_termios); 441f33a51dSJiri Slaby static void uart_wait_until_sent(struct tty_struct *tty, int timeout); 456f538fe3SLinus Walleij static void uart_change_pm(struct uart_state *state, 466f538fe3SLinus Walleij enum uart_pm_state pm_state); 47ab4382d2SGreg Kroah-Hartman 48b922e19dSJiri Slaby static void uart_port_shutdown(struct tty_port *port); 49b922e19dSJiri Slaby 50299245a1SPeter Hurley static int uart_dcd_enabled(struct uart_port *uport) 51299245a1SPeter Hurley { 52d4260b51SPeter Hurley return !!(uport->status & UPSTAT_DCD_ENABLE); 53299245a1SPeter Hurley } 54299245a1SPeter Hurley 559ed19428SPeter Hurley static inline struct uart_port *uart_port_ref(struct uart_state *state) 569ed19428SPeter Hurley { 579ed19428SPeter Hurley if (atomic_add_unless(&state->refcount, 1, 0)) 589ed19428SPeter Hurley return state->uart_port; 599ed19428SPeter Hurley return NULL; 609ed19428SPeter Hurley } 619ed19428SPeter Hurley 629ed19428SPeter Hurley static inline void uart_port_deref(struct uart_port *uport) 639ed19428SPeter Hurley { 64ef510beaSAndy Shevchenko if (atomic_dec_and_test(&uport->state->refcount)) 659ed19428SPeter Hurley wake_up(&uport->state->remove_wait); 669ed19428SPeter Hurley } 679ed19428SPeter Hurley 689ed19428SPeter Hurley #define uart_port_lock(state, flags) \ 699ed19428SPeter Hurley ({ \ 709ed19428SPeter Hurley struct uart_port *__uport = uart_port_ref(state); \ 719ed19428SPeter Hurley if (__uport) \ 729ed19428SPeter Hurley spin_lock_irqsave(&__uport->lock, flags); \ 739ed19428SPeter Hurley __uport; \ 749ed19428SPeter Hurley }) 759ed19428SPeter Hurley 769ed19428SPeter Hurley #define uart_port_unlock(uport, flags) \ 779ed19428SPeter Hurley ({ \ 789ed19428SPeter Hurley struct uart_port *__uport = uport; \ 79ef510beaSAndy Shevchenko if (__uport) { \ 809ed19428SPeter Hurley spin_unlock_irqrestore(&__uport->lock, flags); \ 819ed19428SPeter Hurley uart_port_deref(__uport); \ 82ef510beaSAndy Shevchenko } \ 839ed19428SPeter Hurley }) 849ed19428SPeter Hurley 854047b371SPeter Hurley static inline struct uart_port *uart_port_check(struct uart_state *state) 864047b371SPeter Hurley { 877da4b8b7SPeter Hurley lockdep_assert_held(&state->port.mutex); 884047b371SPeter Hurley return state->uart_port; 894047b371SPeter Hurley } 904047b371SPeter Hurley 91ab4382d2SGreg Kroah-Hartman /* 92ab4382d2SGreg Kroah-Hartman * This routine is used by the interrupt handler to schedule processing in 93ab4382d2SGreg Kroah-Hartman * the software interrupt portion of the driver. 94ab4382d2SGreg Kroah-Hartman */ 95ab4382d2SGreg Kroah-Hartman void uart_write_wakeup(struct uart_port *port) 96ab4382d2SGreg Kroah-Hartman { 97ab4382d2SGreg Kroah-Hartman struct uart_state *state = port->state; 98ab4382d2SGreg Kroah-Hartman /* 99ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 100ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 101ab4382d2SGreg Kroah-Hartman */ 102ab4382d2SGreg Kroah-Hartman BUG_ON(!state); 103d0f4bce2SRob Herring tty_port_tty_wakeup(&state->port); 104ab4382d2SGreg Kroah-Hartman } 105ab4382d2SGreg Kroah-Hartman 106ab4382d2SGreg Kroah-Hartman static void uart_stop(struct tty_struct *tty) 107ab4382d2SGreg Kroah-Hartman { 108ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1099ed19428SPeter Hurley struct uart_port *port; 110ab4382d2SGreg Kroah-Hartman unsigned long flags; 111ab4382d2SGreg Kroah-Hartman 1129ed19428SPeter Hurley port = uart_port_lock(state, flags); 1139ed19428SPeter Hurley if (port) 114ab4382d2SGreg Kroah-Hartman port->ops->stop_tx(port); 1159ed19428SPeter Hurley uart_port_unlock(port, flags); 116ab4382d2SGreg Kroah-Hartman } 117ab4382d2SGreg Kroah-Hartman 118ab4382d2SGreg Kroah-Hartman static void __uart_start(struct tty_struct *tty) 119ab4382d2SGreg Kroah-Hartman { 120ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 121ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 122ab4382d2SGreg Kroah-Hartman 1239ed19428SPeter Hurley if (port && !uart_tx_stopped(port)) 124ab4382d2SGreg Kroah-Hartman port->ops->start_tx(port); 125ab4382d2SGreg Kroah-Hartman } 126ab4382d2SGreg Kroah-Hartman 127ab4382d2SGreg Kroah-Hartman static void uart_start(struct tty_struct *tty) 128ab4382d2SGreg Kroah-Hartman { 129ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1309ed19428SPeter Hurley struct uart_port *port; 131ab4382d2SGreg Kroah-Hartman unsigned long flags; 132ab4382d2SGreg Kroah-Hartman 1339ed19428SPeter Hurley port = uart_port_lock(state, flags); 134ab4382d2SGreg Kroah-Hartman __uart_start(tty); 1359ed19428SPeter Hurley uart_port_unlock(port, flags); 136ab4382d2SGreg Kroah-Hartman } 137ab4382d2SGreg Kroah-Hartman 138f4581cabSDenys Vlasenko static void 139ab4382d2SGreg Kroah-Hartman uart_update_mctrl(struct uart_port *port, unsigned int set, unsigned int clear) 140ab4382d2SGreg Kroah-Hartman { 141ab4382d2SGreg Kroah-Hartman unsigned long flags; 142ab4382d2SGreg Kroah-Hartman unsigned int old; 143ab4382d2SGreg Kroah-Hartman 144ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 145ab4382d2SGreg Kroah-Hartman old = port->mctrl; 146ab4382d2SGreg Kroah-Hartman port->mctrl = (old & ~clear) | set; 147ab4382d2SGreg Kroah-Hartman if (old != port->mctrl) 148ab4382d2SGreg Kroah-Hartman port->ops->set_mctrl(port, port->mctrl); 149ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 150ab4382d2SGreg Kroah-Hartman } 151ab4382d2SGreg Kroah-Hartman 152ab4382d2SGreg Kroah-Hartman #define uart_set_mctrl(port, set) uart_update_mctrl(port, set, 0) 153ab4382d2SGreg Kroah-Hartman #define uart_clear_mctrl(port, clear) uart_update_mctrl(port, 0, clear) 154ab4382d2SGreg Kroah-Hartman 155a6845e1eSRafael Gago static void uart_port_dtr_rts(struct uart_port *uport, int raise) 156a6845e1eSRafael Gago { 157a6845e1eSRafael Gago int rs485_on = uport->rs485_config && 158a6845e1eSRafael Gago (uport->rs485.flags & SER_RS485_ENABLED); 159a6845e1eSRafael Gago int RTS_after_send = !!(uport->rs485.flags & SER_RS485_RTS_AFTER_SEND); 160a6845e1eSRafael Gago 161a6845e1eSRafael Gago if (raise) { 162a6845e1eSRafael Gago if (rs485_on && !RTS_after_send) { 163a6845e1eSRafael Gago uart_set_mctrl(uport, TIOCM_DTR); 164a6845e1eSRafael Gago uart_clear_mctrl(uport, TIOCM_RTS); 165a6845e1eSRafael Gago } else { 166a6845e1eSRafael Gago uart_set_mctrl(uport, TIOCM_DTR | TIOCM_RTS); 167a6845e1eSRafael Gago } 168a6845e1eSRafael Gago } else { 169a6845e1eSRafael Gago unsigned int clear = TIOCM_DTR; 170a6845e1eSRafael Gago 171a6845e1eSRafael Gago clear |= (!rs485_on || !RTS_after_send) ? TIOCM_RTS : 0; 172a6845e1eSRafael Gago uart_clear_mctrl(uport, clear); 173a6845e1eSRafael Gago } 174a6845e1eSRafael Gago } 175a6845e1eSRafael Gago 176ab4382d2SGreg Kroah-Hartman /* 177ab4382d2SGreg Kroah-Hartman * Startup the port. This will be called once per open. All calls 178ab4382d2SGreg Kroah-Hartman * will be serialised by the per-port mutex. 179ab4382d2SGreg Kroah-Hartman */ 180c0d92be6SJiri Slaby static int uart_port_startup(struct tty_struct *tty, struct uart_state *state, 181c0d92be6SJiri Slaby int init_hw) 182ab4382d2SGreg Kroah-Hartman { 1834047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 184ab4382d2SGreg Kroah-Hartman unsigned long page; 185ab4382d2SGreg Kroah-Hartman int retval = 0; 186ab4382d2SGreg Kroah-Hartman 187ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) 188c0d92be6SJiri Slaby return 1; 189ab4382d2SGreg Kroah-Hartman 190ab4382d2SGreg Kroah-Hartman /* 1917deb39edSThomas Pfaff * Make sure the device is in D0 state. 1927deb39edSThomas Pfaff */ 1937deb39edSThomas Pfaff uart_change_pm(state, UART_PM_STATE_ON); 1947deb39edSThomas Pfaff 1957deb39edSThomas Pfaff /* 196ab4382d2SGreg Kroah-Hartman * Initialise and allocate the transmit and temporary 197ab4382d2SGreg Kroah-Hartman * buffer. 198ab4382d2SGreg Kroah-Hartman */ 199ab4382d2SGreg Kroah-Hartman if (!state->xmit.buf) { 200ab4382d2SGreg Kroah-Hartman /* This is protected by the per port mutex */ 201ab4382d2SGreg Kroah-Hartman page = get_zeroed_page(GFP_KERNEL); 202ab4382d2SGreg Kroah-Hartman if (!page) 203ab4382d2SGreg Kroah-Hartman return -ENOMEM; 204ab4382d2SGreg Kroah-Hartman 205ab4382d2SGreg Kroah-Hartman state->xmit.buf = (unsigned char *) page; 206ab4382d2SGreg Kroah-Hartman uart_circ_clear(&state->xmit); 207ab4382d2SGreg Kroah-Hartman } 208ab4382d2SGreg Kroah-Hartman 209ab4382d2SGreg Kroah-Hartman retval = uport->ops->startup(uport); 210ab4382d2SGreg Kroah-Hartman if (retval == 0) { 211c7d7abffSJiri Slaby if (uart_console(uport) && uport->cons->cflag) { 212adc8d746SAlan Cox tty->termios.c_cflag = uport->cons->cflag; 213c7d7abffSJiri Slaby uport->cons->cflag = 0; 214c7d7abffSJiri Slaby } 215ab4382d2SGreg Kroah-Hartman /* 216ab4382d2SGreg Kroah-Hartman * Initialise the hardware port settings. 217ab4382d2SGreg Kroah-Hartman */ 218ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 219ab4382d2SGreg Kroah-Hartman 220ab4382d2SGreg Kroah-Hartman /* 221ab4382d2SGreg Kroah-Hartman * Setup the RTS and DTR signals once the 222ab4382d2SGreg Kroah-Hartman * port is open and ready to respond. 223ab4382d2SGreg Kroah-Hartman */ 2249db276f8SPeter Hurley if (init_hw && C_BAUD(tty)) 225a6845e1eSRafael Gago uart_port_dtr_rts(uport, 1); 226ab4382d2SGreg Kroah-Hartman } 227ab4382d2SGreg Kroah-Hartman 2280055197eSJiri Slaby /* 2290055197eSJiri Slaby * This is to allow setserial on this port. People may want to set 2300055197eSJiri Slaby * port/irq/type and then reconfigure the port properly if it failed 2310055197eSJiri Slaby * now. 2320055197eSJiri Slaby */ 233ab4382d2SGreg Kroah-Hartman if (retval && capable(CAP_SYS_ADMIN)) 234c0d92be6SJiri Slaby return 1; 235c0d92be6SJiri Slaby 236c0d92be6SJiri Slaby return retval; 237c0d92be6SJiri Slaby } 238c0d92be6SJiri Slaby 239c0d92be6SJiri Slaby static int uart_startup(struct tty_struct *tty, struct uart_state *state, 240c0d92be6SJiri Slaby int init_hw) 241c0d92be6SJiri Slaby { 242c0d92be6SJiri Slaby struct tty_port *port = &state->port; 243c0d92be6SJiri Slaby int retval; 244c0d92be6SJiri Slaby 245d41861caSPeter Hurley if (tty_port_initialized(port)) 246c0d92be6SJiri Slaby return 0; 247c0d92be6SJiri Slaby 248c0d92be6SJiri Slaby retval = uart_port_startup(tty, state, init_hw); 249b3b57646SRob Herring if (retval) 250b3b57646SRob Herring set_bit(TTY_IO_ERROR, &tty->flags); 251ab4382d2SGreg Kroah-Hartman 252ab4382d2SGreg Kroah-Hartman return retval; 253ab4382d2SGreg Kroah-Hartman } 254ab4382d2SGreg Kroah-Hartman 255ab4382d2SGreg Kroah-Hartman /* 256ab4382d2SGreg Kroah-Hartman * This routine will shutdown a serial port; interrupts are disabled, and 257ab4382d2SGreg Kroah-Hartman * DTR is dropped if the hangup on close termio flag is on. Calls to 258ab4382d2SGreg Kroah-Hartman * uart_shutdown are serialised by the per-port semaphore. 259af224ca2SPeter Hurley * 260af224ca2SPeter Hurley * uport == NULL if uart_port has already been removed 261ab4382d2SGreg Kroah-Hartman */ 262ab4382d2SGreg Kroah-Hartman static void uart_shutdown(struct tty_struct *tty, struct uart_state *state) 263ab4382d2SGreg Kroah-Hartman { 2644047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 265ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 266ab4382d2SGreg Kroah-Hartman 267ab4382d2SGreg Kroah-Hartman /* 268ab4382d2SGreg Kroah-Hartman * Set the TTY IO error marker 269ab4382d2SGreg Kroah-Hartman */ 270ab4382d2SGreg Kroah-Hartman if (tty) 271ab4382d2SGreg Kroah-Hartman set_bit(TTY_IO_ERROR, &tty->flags); 272ab4382d2SGreg Kroah-Hartman 273d41861caSPeter Hurley if (tty_port_initialized(port)) { 274d41861caSPeter Hurley tty_port_set_initialized(port, 0); 275d41861caSPeter Hurley 276ab4382d2SGreg Kroah-Hartman /* 277ab4382d2SGreg Kroah-Hartman * Turn off DTR and RTS early. 278ab4382d2SGreg Kroah-Hartman */ 279af224ca2SPeter Hurley if (uport && uart_console(uport) && tty) 280ae84db96SPeter Hurley uport->cons->cflag = tty->termios.c_cflag; 281ae84db96SPeter Hurley 2829db276f8SPeter Hurley if (!tty || C_HUPCL(tty)) 283a6845e1eSRafael Gago uart_port_dtr_rts(uport, 0); 284ab4382d2SGreg Kroah-Hartman 285b922e19dSJiri Slaby uart_port_shutdown(port); 286ab4382d2SGreg Kroah-Hartman } 287ab4382d2SGreg Kroah-Hartman 288ab4382d2SGreg Kroah-Hartman /* 289d208a3bfSDoug Anderson * It's possible for shutdown to be called after suspend if we get 290d208a3bfSDoug Anderson * a DCD drop (hangup) at just the right time. Clear suspended bit so 291d208a3bfSDoug Anderson * we don't try to resume a port that has been shutdown. 292ab4382d2SGreg Kroah-Hartman */ 29380f02d54SPeter Hurley tty_port_set_suspended(port, 0); 294ab4382d2SGreg Kroah-Hartman 295ab4382d2SGreg Kroah-Hartman /* 296ab4382d2SGreg Kroah-Hartman * Free the transmit buffer page. 297ab4382d2SGreg Kroah-Hartman */ 298ab4382d2SGreg Kroah-Hartman if (state->xmit.buf) { 299ab4382d2SGreg Kroah-Hartman free_page((unsigned long)state->xmit.buf); 300ab4382d2SGreg Kroah-Hartman state->xmit.buf = NULL; 301ab4382d2SGreg Kroah-Hartman } 302ab4382d2SGreg Kroah-Hartman } 303ab4382d2SGreg Kroah-Hartman 304ab4382d2SGreg Kroah-Hartman /** 305ab4382d2SGreg Kroah-Hartman * uart_update_timeout - update per-port FIFO timeout. 306ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port 307ab4382d2SGreg Kroah-Hartman * @cflag: termios cflag value 308ab4382d2SGreg Kroah-Hartman * @baud: speed of the port 309ab4382d2SGreg Kroah-Hartman * 310ab4382d2SGreg Kroah-Hartman * Set the port FIFO timeout value. The @cflag value should 311ab4382d2SGreg Kroah-Hartman * reflect the actual hardware settings. 312ab4382d2SGreg Kroah-Hartman */ 313ab4382d2SGreg Kroah-Hartman void 314ab4382d2SGreg Kroah-Hartman uart_update_timeout(struct uart_port *port, unsigned int cflag, 315ab4382d2SGreg Kroah-Hartman unsigned int baud) 316ab4382d2SGreg Kroah-Hartman { 317ab4382d2SGreg Kroah-Hartman unsigned int bits; 318ab4382d2SGreg Kroah-Hartman 319ab4382d2SGreg Kroah-Hartman /* byte size and parity */ 320ab4382d2SGreg Kroah-Hartman switch (cflag & CSIZE) { 321ab4382d2SGreg Kroah-Hartman case CS5: 322ab4382d2SGreg Kroah-Hartman bits = 7; 323ab4382d2SGreg Kroah-Hartman break; 324ab4382d2SGreg Kroah-Hartman case CS6: 325ab4382d2SGreg Kroah-Hartman bits = 8; 326ab4382d2SGreg Kroah-Hartman break; 327ab4382d2SGreg Kroah-Hartman case CS7: 328ab4382d2SGreg Kroah-Hartman bits = 9; 329ab4382d2SGreg Kroah-Hartman break; 330ab4382d2SGreg Kroah-Hartman default: 331ab4382d2SGreg Kroah-Hartman bits = 10; 332ab4382d2SGreg Kroah-Hartman break; /* CS8 */ 333ab4382d2SGreg Kroah-Hartman } 334ab4382d2SGreg Kroah-Hartman 335ab4382d2SGreg Kroah-Hartman if (cflag & CSTOPB) 336ab4382d2SGreg Kroah-Hartman bits++; 337ab4382d2SGreg Kroah-Hartman if (cflag & PARENB) 338ab4382d2SGreg Kroah-Hartman bits++; 339ab4382d2SGreg Kroah-Hartman 340ab4382d2SGreg Kroah-Hartman /* 341ab4382d2SGreg Kroah-Hartman * The total number of bits to be transmitted in the fifo. 342ab4382d2SGreg Kroah-Hartman */ 343ab4382d2SGreg Kroah-Hartman bits = bits * port->fifosize; 344ab4382d2SGreg Kroah-Hartman 345ab4382d2SGreg Kroah-Hartman /* 346ab4382d2SGreg Kroah-Hartman * Figure the timeout to send the above number of bits. 347ab4382d2SGreg Kroah-Hartman * Add .02 seconds of slop 348ab4382d2SGreg Kroah-Hartman */ 349ab4382d2SGreg Kroah-Hartman port->timeout = (HZ * bits) / baud + HZ/50; 350ab4382d2SGreg Kroah-Hartman } 351ab4382d2SGreg Kroah-Hartman 352ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_update_timeout); 353ab4382d2SGreg Kroah-Hartman 354ab4382d2SGreg Kroah-Hartman /** 355ab4382d2SGreg Kroah-Hartman * uart_get_baud_rate - return baud rate for a particular port 356ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port in question. 357ab4382d2SGreg Kroah-Hartman * @termios: desired termios settings. 358ab4382d2SGreg Kroah-Hartman * @old: old termios (or NULL) 359ab4382d2SGreg Kroah-Hartman * @min: minimum acceptable baud rate 360ab4382d2SGreg Kroah-Hartman * @max: maximum acceptable baud rate 361ab4382d2SGreg Kroah-Hartman * 362ab4382d2SGreg Kroah-Hartman * Decode the termios structure into a numeric baud rate, 363ab4382d2SGreg Kroah-Hartman * taking account of the magic 38400 baud rate (with spd_* 364ab4382d2SGreg Kroah-Hartman * flags), and mapping the %B0 rate to 9600 baud. 365ab4382d2SGreg Kroah-Hartman * 366ab4382d2SGreg Kroah-Hartman * If the new baud rate is invalid, try the old termios setting. 367ab4382d2SGreg Kroah-Hartman * If it's still invalid, we try 9600 baud. 368ab4382d2SGreg Kroah-Hartman * 369ab4382d2SGreg Kroah-Hartman * Update the @termios structure to reflect the baud rate 370ab4382d2SGreg Kroah-Hartman * we're actually going to be using. Don't do this for the case 371ab4382d2SGreg Kroah-Hartman * where B0 is requested ("hang up"). 372ab4382d2SGreg Kroah-Hartman */ 373ab4382d2SGreg Kroah-Hartman unsigned int 374ab4382d2SGreg Kroah-Hartman uart_get_baud_rate(struct uart_port *port, struct ktermios *termios, 375ab4382d2SGreg Kroah-Hartman struct ktermios *old, unsigned int min, unsigned int max) 376ab4382d2SGreg Kroah-Hartman { 377f10a2233SJoakim Nordell unsigned int try; 378f10a2233SJoakim Nordell unsigned int baud; 379f10a2233SJoakim Nordell unsigned int altbaud; 380ab4382d2SGreg Kroah-Hartman int hung_up = 0; 381ab4382d2SGreg Kroah-Hartman upf_t flags = port->flags & UPF_SPD_MASK; 382ab4382d2SGreg Kroah-Hartman 383f10a2233SJoakim Nordell switch (flags) { 384f10a2233SJoakim Nordell case UPF_SPD_HI: 385ab4382d2SGreg Kroah-Hartman altbaud = 57600; 386f10a2233SJoakim Nordell break; 387f10a2233SJoakim Nordell case UPF_SPD_VHI: 388ab4382d2SGreg Kroah-Hartman altbaud = 115200; 389f10a2233SJoakim Nordell break; 390f10a2233SJoakim Nordell case UPF_SPD_SHI: 391ab4382d2SGreg Kroah-Hartman altbaud = 230400; 392f10a2233SJoakim Nordell break; 393f10a2233SJoakim Nordell case UPF_SPD_WARP: 394ab4382d2SGreg Kroah-Hartman altbaud = 460800; 395f10a2233SJoakim Nordell break; 396f10a2233SJoakim Nordell default: 397f10a2233SJoakim Nordell altbaud = 38400; 398f10a2233SJoakim Nordell break; 399f10a2233SJoakim Nordell } 400ab4382d2SGreg Kroah-Hartman 401ab4382d2SGreg Kroah-Hartman for (try = 0; try < 2; try++) { 402ab4382d2SGreg Kroah-Hartman baud = tty_termios_baud_rate(termios); 403ab4382d2SGreg Kroah-Hartman 404ab4382d2SGreg Kroah-Hartman /* 405ab4382d2SGreg Kroah-Hartman * The spd_hi, spd_vhi, spd_shi, spd_warp kludge... 406ab4382d2SGreg Kroah-Hartman * Die! Die! Die! 407ab4382d2SGreg Kroah-Hartman */ 408547039ecSPeter Hurley if (try == 0 && baud == 38400) 409ab4382d2SGreg Kroah-Hartman baud = altbaud; 410ab4382d2SGreg Kroah-Hartman 411ab4382d2SGreg Kroah-Hartman /* 412ab4382d2SGreg Kroah-Hartman * Special case: B0 rate. 413ab4382d2SGreg Kroah-Hartman */ 414ab4382d2SGreg Kroah-Hartman if (baud == 0) { 415ab4382d2SGreg Kroah-Hartman hung_up = 1; 416ab4382d2SGreg Kroah-Hartman baud = 9600; 417ab4382d2SGreg Kroah-Hartman } 418ab4382d2SGreg Kroah-Hartman 419ab4382d2SGreg Kroah-Hartman if (baud >= min && baud <= max) 420ab4382d2SGreg Kroah-Hartman return baud; 421ab4382d2SGreg Kroah-Hartman 422ab4382d2SGreg Kroah-Hartman /* 423ab4382d2SGreg Kroah-Hartman * Oops, the quotient was zero. Try again with 424ab4382d2SGreg Kroah-Hartman * the old baud rate if possible. 425ab4382d2SGreg Kroah-Hartman */ 426ab4382d2SGreg Kroah-Hartman termios->c_cflag &= ~CBAUD; 427ab4382d2SGreg Kroah-Hartman if (old) { 428ab4382d2SGreg Kroah-Hartman baud = tty_termios_baud_rate(old); 429ab4382d2SGreg Kroah-Hartman if (!hung_up) 430ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 431ab4382d2SGreg Kroah-Hartman baud, baud); 432ab4382d2SGreg Kroah-Hartman old = NULL; 433ab4382d2SGreg Kroah-Hartman continue; 434ab4382d2SGreg Kroah-Hartman } 435ab4382d2SGreg Kroah-Hartman 436ab4382d2SGreg Kroah-Hartman /* 437ab4382d2SGreg Kroah-Hartman * As a last resort, if the range cannot be met then clip to 438ab4382d2SGreg Kroah-Hartman * the nearest chip supported rate. 439ab4382d2SGreg Kroah-Hartman */ 440ab4382d2SGreg Kroah-Hartman if (!hung_up) { 441ab4382d2SGreg Kroah-Hartman if (baud <= min) 442ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 443ab4382d2SGreg Kroah-Hartman min + 1, min + 1); 444ab4382d2SGreg Kroah-Hartman else 445ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 446ab4382d2SGreg Kroah-Hartman max - 1, max - 1); 447ab4382d2SGreg Kroah-Hartman } 448ab4382d2SGreg Kroah-Hartman } 449ab4382d2SGreg Kroah-Hartman /* Should never happen */ 450ab4382d2SGreg Kroah-Hartman WARN_ON(1); 451ab4382d2SGreg Kroah-Hartman return 0; 452ab4382d2SGreg Kroah-Hartman } 453ab4382d2SGreg Kroah-Hartman 454ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_get_baud_rate); 455ab4382d2SGreg Kroah-Hartman 456ab4382d2SGreg Kroah-Hartman /** 457ab4382d2SGreg Kroah-Hartman * uart_get_divisor - return uart clock divisor 458ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port. 459ab4382d2SGreg Kroah-Hartman * @baud: desired baud rate 460ab4382d2SGreg Kroah-Hartman * 461ab4382d2SGreg Kroah-Hartman * Calculate the uart clock divisor for the port. 462ab4382d2SGreg Kroah-Hartman */ 463ab4382d2SGreg Kroah-Hartman unsigned int 464ab4382d2SGreg Kroah-Hartman uart_get_divisor(struct uart_port *port, unsigned int baud) 465ab4382d2SGreg Kroah-Hartman { 466ab4382d2SGreg Kroah-Hartman unsigned int quot; 467ab4382d2SGreg Kroah-Hartman 468ab4382d2SGreg Kroah-Hartman /* 469ab4382d2SGreg Kroah-Hartman * Old custom speed handling. 470ab4382d2SGreg Kroah-Hartman */ 471ab4382d2SGreg Kroah-Hartman if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) 472ab4382d2SGreg Kroah-Hartman quot = port->custom_divisor; 473ab4382d2SGreg Kroah-Hartman else 47497d24634SUwe Kleine-König quot = DIV_ROUND_CLOSEST(port->uartclk, 16 * baud); 475ab4382d2SGreg Kroah-Hartman 476ab4382d2SGreg Kroah-Hartman return quot; 477ab4382d2SGreg Kroah-Hartman } 478ab4382d2SGreg Kroah-Hartman 479ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_get_divisor); 480ab4382d2SGreg Kroah-Hartman 4817c8ab967SPeter Hurley /* Caller holds port mutex */ 482ab4382d2SGreg Kroah-Hartman static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, 483ab4382d2SGreg Kroah-Hartman struct ktermios *old_termios) 484ab4382d2SGreg Kroah-Hartman { 4854047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 486ab4382d2SGreg Kroah-Hartman struct ktermios *termios; 487391f93f2SPeter Hurley int hw_stopped; 488ab4382d2SGreg Kroah-Hartman 489ab4382d2SGreg Kroah-Hartman /* 490ab4382d2SGreg Kroah-Hartman * If we have no tty, termios, or the port does not exist, 491ab4382d2SGreg Kroah-Hartman * then we can't set the parameters for this port. 492ab4382d2SGreg Kroah-Hartman */ 493adc8d746SAlan Cox if (!tty || uport->type == PORT_UNKNOWN) 494ab4382d2SGreg Kroah-Hartman return; 495ab4382d2SGreg Kroah-Hartman 496adc8d746SAlan Cox termios = &tty->termios; 497c18b55fdSPeter Hurley uport->ops->set_termios(uport, termios, old_termios); 498ab4382d2SGreg Kroah-Hartman 499ab4382d2SGreg Kroah-Hartman /* 500299245a1SPeter Hurley * Set modem status enables based on termios cflag 501ab4382d2SGreg Kroah-Hartman */ 502299245a1SPeter Hurley spin_lock_irq(&uport->lock); 503ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CRTSCTS) 504299245a1SPeter Hurley uport->status |= UPSTAT_CTS_ENABLE; 505ab4382d2SGreg Kroah-Hartman else 506299245a1SPeter Hurley uport->status &= ~UPSTAT_CTS_ENABLE; 507ab4382d2SGreg Kroah-Hartman 508ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CLOCAL) 509299245a1SPeter Hurley uport->status &= ~UPSTAT_DCD_ENABLE; 510ab4382d2SGreg Kroah-Hartman else 511299245a1SPeter Hurley uport->status |= UPSTAT_DCD_ENABLE; 512391f93f2SPeter Hurley 513391f93f2SPeter Hurley /* reset sw-assisted CTS flow control based on (possibly) new mode */ 514391f93f2SPeter Hurley hw_stopped = uport->hw_stopped; 515391f93f2SPeter Hurley uport->hw_stopped = uart_softcts_mode(uport) && 516391f93f2SPeter Hurley !(uport->ops->get_mctrl(uport) & TIOCM_CTS); 517391f93f2SPeter Hurley if (uport->hw_stopped) { 518391f93f2SPeter Hurley if (!hw_stopped) 519391f93f2SPeter Hurley uport->ops->stop_tx(uport); 520391f93f2SPeter Hurley } else { 521391f93f2SPeter Hurley if (hw_stopped) 522391f93f2SPeter Hurley __uart_start(tty); 523391f93f2SPeter Hurley } 524299245a1SPeter Hurley spin_unlock_irq(&uport->lock); 525ab4382d2SGreg Kroah-Hartman } 526ab4382d2SGreg Kroah-Hartman 527f5291eccSPeter Hurley static int uart_put_char(struct tty_struct *tty, unsigned char c) 528ab4382d2SGreg Kroah-Hartman { 529f5291eccSPeter Hurley struct uart_state *state = tty->driver_data; 5309ed19428SPeter Hurley struct uart_port *port; 531f5291eccSPeter Hurley struct circ_buf *circ; 532ab4382d2SGreg Kroah-Hartman unsigned long flags; 533ab4382d2SGreg Kroah-Hartman int ret = 0; 534ab4382d2SGreg Kroah-Hartman 535f5291eccSPeter Hurley circ = &state->xmit; 536ab4382d2SGreg Kroah-Hartman if (!circ->buf) 537ab4382d2SGreg Kroah-Hartman return 0; 538ab4382d2SGreg Kroah-Hartman 5399ed19428SPeter Hurley port = uart_port_lock(state, flags); 5409ed19428SPeter Hurley if (port && uart_circ_chars_free(circ) != 0) { 541ab4382d2SGreg Kroah-Hartman circ->buf[circ->head] = c; 542ab4382d2SGreg Kroah-Hartman circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1); 543ab4382d2SGreg Kroah-Hartman ret = 1; 544ab4382d2SGreg Kroah-Hartman } 5459ed19428SPeter Hurley uart_port_unlock(port, flags); 546ab4382d2SGreg Kroah-Hartman return ret; 547ab4382d2SGreg Kroah-Hartman } 548ab4382d2SGreg Kroah-Hartman 549ab4382d2SGreg Kroah-Hartman static void uart_flush_chars(struct tty_struct *tty) 550ab4382d2SGreg Kroah-Hartman { 551ab4382d2SGreg Kroah-Hartman uart_start(tty); 552ab4382d2SGreg Kroah-Hartman } 553ab4382d2SGreg Kroah-Hartman 554ab4382d2SGreg Kroah-Hartman static int uart_write(struct tty_struct *tty, 555ab4382d2SGreg Kroah-Hartman const unsigned char *buf, int count) 556ab4382d2SGreg Kroah-Hartman { 557ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 558ab4382d2SGreg Kroah-Hartman struct uart_port *port; 559ab4382d2SGreg Kroah-Hartman struct circ_buf *circ; 560ab4382d2SGreg Kroah-Hartman unsigned long flags; 561ab4382d2SGreg Kroah-Hartman int c, ret = 0; 562ab4382d2SGreg Kroah-Hartman 563ab4382d2SGreg Kroah-Hartman /* 564ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 565ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 566ab4382d2SGreg Kroah-Hartman */ 567ab4382d2SGreg Kroah-Hartman if (!state) { 568ab4382d2SGreg Kroah-Hartman WARN_ON(1); 569ab4382d2SGreg Kroah-Hartman return -EL3HLT; 570ab4382d2SGreg Kroah-Hartman } 571ab4382d2SGreg Kroah-Hartman 572ab4382d2SGreg Kroah-Hartman circ = &state->xmit; 573ab4382d2SGreg Kroah-Hartman if (!circ->buf) 574ab4382d2SGreg Kroah-Hartman return 0; 575ab4382d2SGreg Kroah-Hartman 5769ed19428SPeter Hurley port = uart_port_lock(state, flags); 5779ed19428SPeter Hurley while (port) { 578ab4382d2SGreg Kroah-Hartman c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE); 579ab4382d2SGreg Kroah-Hartman if (count < c) 580ab4382d2SGreg Kroah-Hartman c = count; 581ab4382d2SGreg Kroah-Hartman if (c <= 0) 582ab4382d2SGreg Kroah-Hartman break; 583ab4382d2SGreg Kroah-Hartman memcpy(circ->buf + circ->head, buf, c); 584ab4382d2SGreg Kroah-Hartman circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1); 585ab4382d2SGreg Kroah-Hartman buf += c; 586ab4382d2SGreg Kroah-Hartman count -= c; 587ab4382d2SGreg Kroah-Hartman ret += c; 588ab4382d2SGreg Kroah-Hartman } 58964dbee31SPeter Hurley 59064dbee31SPeter Hurley __uart_start(tty); 5919ed19428SPeter Hurley uart_port_unlock(port, flags); 592ab4382d2SGreg Kroah-Hartman return ret; 593ab4382d2SGreg Kroah-Hartman } 594ab4382d2SGreg Kroah-Hartman 595ab4382d2SGreg Kroah-Hartman static int uart_write_room(struct tty_struct *tty) 596ab4382d2SGreg Kroah-Hartman { 597ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 5989ed19428SPeter Hurley struct uart_port *port; 599ab4382d2SGreg Kroah-Hartman unsigned long flags; 600ab4382d2SGreg Kroah-Hartman int ret; 601ab4382d2SGreg Kroah-Hartman 6029ed19428SPeter Hurley port = uart_port_lock(state, flags); 603ab4382d2SGreg Kroah-Hartman ret = uart_circ_chars_free(&state->xmit); 6049ed19428SPeter Hurley uart_port_unlock(port, flags); 605ab4382d2SGreg Kroah-Hartman return ret; 606ab4382d2SGreg Kroah-Hartman } 607ab4382d2SGreg Kroah-Hartman 608ab4382d2SGreg Kroah-Hartman static int uart_chars_in_buffer(struct tty_struct *tty) 609ab4382d2SGreg Kroah-Hartman { 610ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 6119ed19428SPeter Hurley struct uart_port *port; 612ab4382d2SGreg Kroah-Hartman unsigned long flags; 613ab4382d2SGreg Kroah-Hartman int ret; 614ab4382d2SGreg Kroah-Hartman 6159ed19428SPeter Hurley port = uart_port_lock(state, flags); 616ab4382d2SGreg Kroah-Hartman ret = uart_circ_chars_pending(&state->xmit); 6179ed19428SPeter Hurley uart_port_unlock(port, flags); 618ab4382d2SGreg Kroah-Hartman return ret; 619ab4382d2SGreg Kroah-Hartman } 620ab4382d2SGreg Kroah-Hartman 621ab4382d2SGreg Kroah-Hartman static void uart_flush_buffer(struct tty_struct *tty) 622ab4382d2SGreg Kroah-Hartman { 623ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 624ab4382d2SGreg Kroah-Hartman struct uart_port *port; 625ab4382d2SGreg Kroah-Hartman unsigned long flags; 626ab4382d2SGreg Kroah-Hartman 627ab4382d2SGreg Kroah-Hartman /* 628ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 629ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 630ab4382d2SGreg Kroah-Hartman */ 631ab4382d2SGreg Kroah-Hartman if (!state) { 632ab4382d2SGreg Kroah-Hartman WARN_ON(1); 633ab4382d2SGreg Kroah-Hartman return; 634ab4382d2SGreg Kroah-Hartman } 635ab4382d2SGreg Kroah-Hartman 636ab4382d2SGreg Kroah-Hartman pr_debug("uart_flush_buffer(%d) called\n", tty->index); 637ab4382d2SGreg Kroah-Hartman 6389ed19428SPeter Hurley port = uart_port_lock(state, flags); 6399ed19428SPeter Hurley if (!port) 6409ed19428SPeter Hurley return; 641ab4382d2SGreg Kroah-Hartman uart_circ_clear(&state->xmit); 642ab4382d2SGreg Kroah-Hartman if (port->ops->flush_buffer) 643ab4382d2SGreg Kroah-Hartman port->ops->flush_buffer(port); 6449ed19428SPeter Hurley uart_port_unlock(port, flags); 645d0f4bce2SRob Herring tty_port_tty_wakeup(&state->port); 646ab4382d2SGreg Kroah-Hartman } 647ab4382d2SGreg Kroah-Hartman 648ab4382d2SGreg Kroah-Hartman /* 649ab4382d2SGreg Kroah-Hartman * This function is used to send a high-priority XON/XOFF character to 650ab4382d2SGreg Kroah-Hartman * the device 651ab4382d2SGreg Kroah-Hartman */ 652ab4382d2SGreg Kroah-Hartman static void uart_send_xchar(struct tty_struct *tty, char ch) 653ab4382d2SGreg Kroah-Hartman { 654ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 6559ed19428SPeter Hurley struct uart_port *port; 656ab4382d2SGreg Kroah-Hartman unsigned long flags; 657ab4382d2SGreg Kroah-Hartman 6589ed19428SPeter Hurley port = uart_port_ref(state); 6599ed19428SPeter Hurley if (!port) 6609ed19428SPeter Hurley return; 6619ed19428SPeter Hurley 662ab4382d2SGreg Kroah-Hartman if (port->ops->send_xchar) 663ab4382d2SGreg Kroah-Hartman port->ops->send_xchar(port, ch); 664ab4382d2SGreg Kroah-Hartman else { 665ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 666c235ccc1SPeter Hurley port->x_char = ch; 667c235ccc1SPeter Hurley if (ch) 668ab4382d2SGreg Kroah-Hartman port->ops->start_tx(port); 669ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 670ab4382d2SGreg Kroah-Hartman } 6719ed19428SPeter Hurley uart_port_deref(port); 672ab4382d2SGreg Kroah-Hartman } 673ab4382d2SGreg Kroah-Hartman 674ab4382d2SGreg Kroah-Hartman static void uart_throttle(struct tty_struct *tty) 675ab4382d2SGreg Kroah-Hartman { 676ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 6779ed19428SPeter Hurley struct uart_port *port; 678391f93f2SPeter Hurley upstat_t mask = 0; 679ab4382d2SGreg Kroah-Hartman 6809ed19428SPeter Hurley port = uart_port_ref(state); 6819ed19428SPeter Hurley if (!port) 6829ed19428SPeter Hurley return; 6839ed19428SPeter Hurley 684ab4382d2SGreg Kroah-Hartman if (I_IXOFF(tty)) 685391f93f2SPeter Hurley mask |= UPSTAT_AUTOXOFF; 6869db276f8SPeter Hurley if (C_CRTSCTS(tty)) 687391f93f2SPeter Hurley mask |= UPSTAT_AUTORTS; 6889aba8d5bSRussell King 689391f93f2SPeter Hurley if (port->status & mask) { 6909aba8d5bSRussell King port->ops->throttle(port); 691391f93f2SPeter Hurley mask &= ~port->status; 6929aba8d5bSRussell King } 6939aba8d5bSRussell King 694391f93f2SPeter Hurley if (mask & UPSTAT_AUTORTS) 6959aba8d5bSRussell King uart_clear_mctrl(port, TIOCM_RTS); 696b4749b97SPeter Hurley 697b4749b97SPeter Hurley if (mask & UPSTAT_AUTOXOFF) 698b4749b97SPeter Hurley uart_send_xchar(tty, STOP_CHAR(tty)); 6999ed19428SPeter Hurley 7009ed19428SPeter Hurley uart_port_deref(port); 701ab4382d2SGreg Kroah-Hartman } 702ab4382d2SGreg Kroah-Hartman 703ab4382d2SGreg Kroah-Hartman static void uart_unthrottle(struct tty_struct *tty) 704ab4382d2SGreg Kroah-Hartman { 705ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 7069ed19428SPeter Hurley struct uart_port *port; 707391f93f2SPeter Hurley upstat_t mask = 0; 708ab4382d2SGreg Kroah-Hartman 7099ed19428SPeter Hurley port = uart_port_ref(state); 7109ed19428SPeter Hurley if (!port) 7119ed19428SPeter Hurley return; 7129ed19428SPeter Hurley 7139aba8d5bSRussell King if (I_IXOFF(tty)) 714391f93f2SPeter Hurley mask |= UPSTAT_AUTOXOFF; 7159db276f8SPeter Hurley if (C_CRTSCTS(tty)) 716391f93f2SPeter Hurley mask |= UPSTAT_AUTORTS; 7179aba8d5bSRussell King 718391f93f2SPeter Hurley if (port->status & mask) { 7199aba8d5bSRussell King port->ops->unthrottle(port); 720391f93f2SPeter Hurley mask &= ~port->status; 7219aba8d5bSRussell King } 7229aba8d5bSRussell King 723391f93f2SPeter Hurley if (mask & UPSTAT_AUTORTS) 724ab4382d2SGreg Kroah-Hartman uart_set_mctrl(port, TIOCM_RTS); 725b4749b97SPeter Hurley 726b4749b97SPeter Hurley if (mask & UPSTAT_AUTOXOFF) 727b4749b97SPeter Hurley uart_send_xchar(tty, START_CHAR(tty)); 7289ed19428SPeter Hurley 7299ed19428SPeter Hurley uart_port_deref(port); 730ab4382d2SGreg Kroah-Hartman } 731ab4382d2SGreg Kroah-Hartman 7324047b371SPeter Hurley static int uart_get_info(struct tty_port *port, struct serial_struct *retinfo) 733ab4382d2SGreg Kroah-Hartman { 7349f109694SAlan Cox struct uart_state *state = container_of(port, struct uart_state, port); 7354047b371SPeter Hurley struct uart_port *uport; 7364047b371SPeter Hurley int ret = -ENODEV; 7377ba2e769SAlan Cox 73837cd0c99SFengguang Wu memset(retinfo, 0, sizeof(*retinfo)); 7397ba2e769SAlan Cox 7403abe8c76SPeter Hurley /* 7413abe8c76SPeter Hurley * Ensure the state we copy is consistent and no hardware changes 7423abe8c76SPeter Hurley * occur as we go 7433abe8c76SPeter Hurley */ 7443abe8c76SPeter Hurley mutex_lock(&port->mutex); 7454047b371SPeter Hurley uport = uart_port_check(state); 7464047b371SPeter Hurley if (!uport) 7474047b371SPeter Hurley goto out; 7484047b371SPeter Hurley 7497ba2e769SAlan Cox retinfo->type = uport->type; 7507ba2e769SAlan Cox retinfo->line = uport->line; 7517ba2e769SAlan Cox retinfo->port = uport->iobase; 7527ba2e769SAlan Cox if (HIGH_BITS_OFFSET) 7537ba2e769SAlan Cox retinfo->port_high = (long) uport->iobase >> HIGH_BITS_OFFSET; 7547ba2e769SAlan Cox retinfo->irq = uport->irq; 755a17e74c5SAndy Shevchenko retinfo->flags = (__force int)uport->flags; 7567ba2e769SAlan Cox retinfo->xmit_fifo_size = uport->fifosize; 7577ba2e769SAlan Cox retinfo->baud_base = uport->uartclk / 16; 7587ba2e769SAlan Cox retinfo->close_delay = jiffies_to_msecs(port->close_delay) / 10; 7597ba2e769SAlan Cox retinfo->closing_wait = port->closing_wait == ASYNC_CLOSING_WAIT_NONE ? 7607ba2e769SAlan Cox ASYNC_CLOSING_WAIT_NONE : 7617ba2e769SAlan Cox jiffies_to_msecs(port->closing_wait) / 10; 7627ba2e769SAlan Cox retinfo->custom_divisor = uport->custom_divisor; 7637ba2e769SAlan Cox retinfo->hub6 = uport->hub6; 7647ba2e769SAlan Cox retinfo->io_type = uport->iotype; 7657ba2e769SAlan Cox retinfo->iomem_reg_shift = uport->regshift; 7667ba2e769SAlan Cox retinfo->iomem_base = (void *)(unsigned long)uport->mapbase; 7674047b371SPeter Hurley 7684047b371SPeter Hurley ret = 0; 7694047b371SPeter Hurley out: 770ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 7714047b371SPeter Hurley return ret; 7729f109694SAlan Cox } 7739f109694SAlan Cox 7749f109694SAlan Cox static int uart_get_info_user(struct tty_port *port, 7759f109694SAlan Cox struct serial_struct __user *retinfo) 7769f109694SAlan Cox { 7779f109694SAlan Cox struct serial_struct tmp; 7783abe8c76SPeter Hurley 7794047b371SPeter Hurley if (uart_get_info(port, &tmp) < 0) 7804047b371SPeter Hurley return -EIO; 781ab4382d2SGreg Kroah-Hartman 782ab4382d2SGreg Kroah-Hartman if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) 783ab4382d2SGreg Kroah-Hartman return -EFAULT; 784ab4382d2SGreg Kroah-Hartman return 0; 785ab4382d2SGreg Kroah-Hartman } 786ab4382d2SGreg Kroah-Hartman 7877ba2e769SAlan Cox static int uart_set_info(struct tty_struct *tty, struct tty_port *port, 7887ba2e769SAlan Cox struct uart_state *state, 7897ba2e769SAlan Cox struct serial_struct *new_info) 790ab4382d2SGreg Kroah-Hartman { 7914047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 792ab4382d2SGreg Kroah-Hartman unsigned long new_port; 793ab4382d2SGreg Kroah-Hartman unsigned int change_irq, change_port, closing_wait; 794ab4382d2SGreg Kroah-Hartman unsigned int old_custom_divisor, close_delay; 795ab4382d2SGreg Kroah-Hartman upf_t old_flags, new_flags; 796ab4382d2SGreg Kroah-Hartman int retval = 0; 797ab4382d2SGreg Kroah-Hartman 7984047b371SPeter Hurley if (!uport) 7994047b371SPeter Hurley return -EIO; 8004047b371SPeter Hurley 8017ba2e769SAlan Cox new_port = new_info->port; 802ab4382d2SGreg Kroah-Hartman if (HIGH_BITS_OFFSET) 8037ba2e769SAlan Cox new_port += (unsigned long) new_info->port_high << HIGH_BITS_OFFSET; 804ab4382d2SGreg Kroah-Hartman 8057ba2e769SAlan Cox new_info->irq = irq_canonicalize(new_info->irq); 8067ba2e769SAlan Cox close_delay = msecs_to_jiffies(new_info->close_delay * 10); 8077ba2e769SAlan Cox closing_wait = new_info->closing_wait == ASYNC_CLOSING_WAIT_NONE ? 8084cb0fbfdSJiri Slaby ASYNC_CLOSING_WAIT_NONE : 8097ba2e769SAlan Cox msecs_to_jiffies(new_info->closing_wait * 10); 810ab4382d2SGreg Kroah-Hartman 811ab4382d2SGreg Kroah-Hartman 812ab4382d2SGreg Kroah-Hartman change_irq = !(uport->flags & UPF_FIXED_PORT) 8137ba2e769SAlan Cox && new_info->irq != uport->irq; 814ab4382d2SGreg Kroah-Hartman 815ab4382d2SGreg Kroah-Hartman /* 816ab4382d2SGreg Kroah-Hartman * Since changing the 'type' of the port changes its resource 817ab4382d2SGreg Kroah-Hartman * allocations, we should treat type changes the same as 818ab4382d2SGreg Kroah-Hartman * IO port changes. 819ab4382d2SGreg Kroah-Hartman */ 820ab4382d2SGreg Kroah-Hartman change_port = !(uport->flags & UPF_FIXED_PORT) 821ab4382d2SGreg Kroah-Hartman && (new_port != uport->iobase || 8227ba2e769SAlan Cox (unsigned long)new_info->iomem_base != uport->mapbase || 8237ba2e769SAlan Cox new_info->hub6 != uport->hub6 || 8247ba2e769SAlan Cox new_info->io_type != uport->iotype || 8257ba2e769SAlan Cox new_info->iomem_reg_shift != uport->regshift || 8267ba2e769SAlan Cox new_info->type != uport->type); 827ab4382d2SGreg Kroah-Hartman 828ab4382d2SGreg Kroah-Hartman old_flags = uport->flags; 829a17e74c5SAndy Shevchenko new_flags = (__force upf_t)new_info->flags; 830ab4382d2SGreg Kroah-Hartman old_custom_divisor = uport->custom_divisor; 831ab4382d2SGreg Kroah-Hartman 832ab4382d2SGreg Kroah-Hartman if (!capable(CAP_SYS_ADMIN)) { 833ab4382d2SGreg Kroah-Hartman retval = -EPERM; 834ab4382d2SGreg Kroah-Hartman if (change_irq || change_port || 8357ba2e769SAlan Cox (new_info->baud_base != uport->uartclk / 16) || 836ab4382d2SGreg Kroah-Hartman (close_delay != port->close_delay) || 837ab4382d2SGreg Kroah-Hartman (closing_wait != port->closing_wait) || 8387ba2e769SAlan Cox (new_info->xmit_fifo_size && 8397ba2e769SAlan Cox new_info->xmit_fifo_size != uport->fifosize) || 840ab4382d2SGreg Kroah-Hartman (((new_flags ^ old_flags) & ~UPF_USR_MASK) != 0)) 841ab4382d2SGreg Kroah-Hartman goto exit; 842ab4382d2SGreg Kroah-Hartman uport->flags = ((uport->flags & ~UPF_USR_MASK) | 843ab4382d2SGreg Kroah-Hartman (new_flags & UPF_USR_MASK)); 8447ba2e769SAlan Cox uport->custom_divisor = new_info->custom_divisor; 845ab4382d2SGreg Kroah-Hartman goto check_and_exit; 846ab4382d2SGreg Kroah-Hartman } 847ab4382d2SGreg Kroah-Hartman 848ab4382d2SGreg Kroah-Hartman /* 849ab4382d2SGreg Kroah-Hartman * Ask the low level driver to verify the settings. 850ab4382d2SGreg Kroah-Hartman */ 851ab4382d2SGreg Kroah-Hartman if (uport->ops->verify_port) 8527ba2e769SAlan Cox retval = uport->ops->verify_port(uport, new_info); 853ab4382d2SGreg Kroah-Hartman 8547ba2e769SAlan Cox if ((new_info->irq >= nr_irqs) || (new_info->irq < 0) || 8557ba2e769SAlan Cox (new_info->baud_base < 9600)) 856ab4382d2SGreg Kroah-Hartman retval = -EINVAL; 857ab4382d2SGreg Kroah-Hartman 858ab4382d2SGreg Kroah-Hartman if (retval) 859ab4382d2SGreg Kroah-Hartman goto exit; 860ab4382d2SGreg Kroah-Hartman 861ab4382d2SGreg Kroah-Hartman if (change_port || change_irq) { 862ab4382d2SGreg Kroah-Hartman retval = -EBUSY; 863ab4382d2SGreg Kroah-Hartman 864ab4382d2SGreg Kroah-Hartman /* 865ab4382d2SGreg Kroah-Hartman * Make sure that we are the sole user of this port. 866ab4382d2SGreg Kroah-Hartman */ 867ab4382d2SGreg Kroah-Hartman if (tty_port_users(port) > 1) 868ab4382d2SGreg Kroah-Hartman goto exit; 869ab4382d2SGreg Kroah-Hartman 870ab4382d2SGreg Kroah-Hartman /* 871ab4382d2SGreg Kroah-Hartman * We need to shutdown the serial port at the old 872ab4382d2SGreg Kroah-Hartman * port/type/irq combination. 873ab4382d2SGreg Kroah-Hartman */ 874ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 875ab4382d2SGreg Kroah-Hartman } 876ab4382d2SGreg Kroah-Hartman 877ab4382d2SGreg Kroah-Hartman if (change_port) { 878ab4382d2SGreg Kroah-Hartman unsigned long old_iobase, old_mapbase; 879ab4382d2SGreg Kroah-Hartman unsigned int old_type, old_iotype, old_hub6, old_shift; 880ab4382d2SGreg Kroah-Hartman 881ab4382d2SGreg Kroah-Hartman old_iobase = uport->iobase; 882ab4382d2SGreg Kroah-Hartman old_mapbase = uport->mapbase; 883ab4382d2SGreg Kroah-Hartman old_type = uport->type; 884ab4382d2SGreg Kroah-Hartman old_hub6 = uport->hub6; 885ab4382d2SGreg Kroah-Hartman old_iotype = uport->iotype; 886ab4382d2SGreg Kroah-Hartman old_shift = uport->regshift; 887ab4382d2SGreg Kroah-Hartman 888ab4382d2SGreg Kroah-Hartman /* 889ab4382d2SGreg Kroah-Hartman * Free and release old regions 890ab4382d2SGreg Kroah-Hartman */ 891a7cfaf16SFabio Estevam if (old_type != PORT_UNKNOWN && uport->ops->release_port) 892ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 893ab4382d2SGreg Kroah-Hartman 894ab4382d2SGreg Kroah-Hartman uport->iobase = new_port; 8957ba2e769SAlan Cox uport->type = new_info->type; 8967ba2e769SAlan Cox uport->hub6 = new_info->hub6; 8977ba2e769SAlan Cox uport->iotype = new_info->io_type; 8987ba2e769SAlan Cox uport->regshift = new_info->iomem_reg_shift; 8997ba2e769SAlan Cox uport->mapbase = (unsigned long)new_info->iomem_base; 900ab4382d2SGreg Kroah-Hartman 901ab4382d2SGreg Kroah-Hartman /* 902ab4382d2SGreg Kroah-Hartman * Claim and map the new regions 903ab4382d2SGreg Kroah-Hartman */ 904a7cfaf16SFabio Estevam if (uport->type != PORT_UNKNOWN && uport->ops->request_port) { 905ab4382d2SGreg Kroah-Hartman retval = uport->ops->request_port(uport); 906ab4382d2SGreg Kroah-Hartman } else { 907ab4382d2SGreg Kroah-Hartman /* Always success - Jean II */ 908ab4382d2SGreg Kroah-Hartman retval = 0; 909ab4382d2SGreg Kroah-Hartman } 910ab4382d2SGreg Kroah-Hartman 911ab4382d2SGreg Kroah-Hartman /* 912ab4382d2SGreg Kroah-Hartman * If we fail to request resources for the 913ab4382d2SGreg Kroah-Hartman * new port, try to restore the old settings. 914ab4382d2SGreg Kroah-Hartman */ 9157deb39edSThomas Pfaff if (retval) { 916ab4382d2SGreg Kroah-Hartman uport->iobase = old_iobase; 917ab4382d2SGreg Kroah-Hartman uport->type = old_type; 918ab4382d2SGreg Kroah-Hartman uport->hub6 = old_hub6; 919ab4382d2SGreg Kroah-Hartman uport->iotype = old_iotype; 920ab4382d2SGreg Kroah-Hartman uport->regshift = old_shift; 921ab4382d2SGreg Kroah-Hartman uport->mapbase = old_mapbase; 9227deb39edSThomas Pfaff 9237deb39edSThomas Pfaff if (old_type != PORT_UNKNOWN) { 924ab4382d2SGreg Kroah-Hartman retval = uport->ops->request_port(uport); 925ab4382d2SGreg Kroah-Hartman /* 926ab4382d2SGreg Kroah-Hartman * If we failed to restore the old settings, 927ab4382d2SGreg Kroah-Hartman * we fail like this. 928ab4382d2SGreg Kroah-Hartman */ 929ab4382d2SGreg Kroah-Hartman if (retval) 930ab4382d2SGreg Kroah-Hartman uport->type = PORT_UNKNOWN; 931ab4382d2SGreg Kroah-Hartman 932ab4382d2SGreg Kroah-Hartman /* 933ab4382d2SGreg Kroah-Hartman * We failed anyway. 934ab4382d2SGreg Kroah-Hartman */ 935ab4382d2SGreg Kroah-Hartman retval = -EBUSY; 9367deb39edSThomas Pfaff } 9377deb39edSThomas Pfaff 938ab4382d2SGreg Kroah-Hartman /* Added to return the correct error -Ram Gupta */ 939ab4382d2SGreg Kroah-Hartman goto exit; 940ab4382d2SGreg Kroah-Hartman } 941ab4382d2SGreg Kroah-Hartman } 942ab4382d2SGreg Kroah-Hartman 943ab4382d2SGreg Kroah-Hartman if (change_irq) 9447ba2e769SAlan Cox uport->irq = new_info->irq; 945ab4382d2SGreg Kroah-Hartman if (!(uport->flags & UPF_FIXED_PORT)) 9467ba2e769SAlan Cox uport->uartclk = new_info->baud_base * 16; 947ab4382d2SGreg Kroah-Hartman uport->flags = (uport->flags & ~UPF_CHANGE_MASK) | 948ab4382d2SGreg Kroah-Hartman (new_flags & UPF_CHANGE_MASK); 9497ba2e769SAlan Cox uport->custom_divisor = new_info->custom_divisor; 950ab4382d2SGreg Kroah-Hartman port->close_delay = close_delay; 951ab4382d2SGreg Kroah-Hartman port->closing_wait = closing_wait; 9527ba2e769SAlan Cox if (new_info->xmit_fifo_size) 9537ba2e769SAlan Cox uport->fifosize = new_info->xmit_fifo_size; 954d6c53c0eSJiri Slaby port->low_latency = (uport->flags & UPF_LOW_LATENCY) ? 1 : 0; 955ab4382d2SGreg Kroah-Hartman 956ab4382d2SGreg Kroah-Hartman check_and_exit: 957ab4382d2SGreg Kroah-Hartman retval = 0; 958ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) 959ab4382d2SGreg Kroah-Hartman goto exit; 960d41861caSPeter Hurley if (tty_port_initialized(port)) { 961ab4382d2SGreg Kroah-Hartman if (((old_flags ^ uport->flags) & UPF_SPD_MASK) || 962ab4382d2SGreg Kroah-Hartman old_custom_divisor != uport->custom_divisor) { 963ab4382d2SGreg Kroah-Hartman /* 964ab4382d2SGreg Kroah-Hartman * If they're setting up a custom divisor or speed, 965dc2f7271SJohan Hovold * instead of clearing it, then bitch about it. 966ab4382d2SGreg Kroah-Hartman */ 967ab4382d2SGreg Kroah-Hartman if (uport->flags & UPF_SPD_MASK) { 968dc2f7271SJohan Hovold dev_notice_ratelimited(uport->dev, 9692f2dafe7SSudip Mukherjee "%s sets custom speed on %s. This is deprecated.\n", 9702f2dafe7SSudip Mukherjee current->comm, 971429b4749SRasmus Villemoes tty_name(port->tty)); 972ab4382d2SGreg Kroah-Hartman } 973ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 974ab4382d2SGreg Kroah-Hartman } 975b3b57646SRob Herring } else { 976ab4382d2SGreg Kroah-Hartman retval = uart_startup(tty, state, 1); 97744117a1dSSebastian Andrzej Siewior if (retval == 0) 97844117a1dSSebastian Andrzej Siewior tty_port_set_initialized(port, true); 979b3b57646SRob Herring if (retval > 0) 980b3b57646SRob Herring retval = 0; 981b3b57646SRob Herring } 982ab4382d2SGreg Kroah-Hartman exit: 9837ba2e769SAlan Cox return retval; 9847ba2e769SAlan Cox } 9857ba2e769SAlan Cox 9867ba2e769SAlan Cox static int uart_set_info_user(struct tty_struct *tty, struct uart_state *state, 9877ba2e769SAlan Cox struct serial_struct __user *newinfo) 9887ba2e769SAlan Cox { 9897ba2e769SAlan Cox struct serial_struct new_serial; 9907ba2e769SAlan Cox struct tty_port *port = &state->port; 9917ba2e769SAlan Cox int retval; 9927ba2e769SAlan Cox 9937ba2e769SAlan Cox if (copy_from_user(&new_serial, newinfo, sizeof(new_serial))) 9947ba2e769SAlan Cox return -EFAULT; 9957ba2e769SAlan Cox 9967ba2e769SAlan Cox /* 9977ba2e769SAlan Cox * This semaphore protects port->count. It is also 9987ba2e769SAlan Cox * very useful to prevent opens. Also, take the 9997ba2e769SAlan Cox * port configuration semaphore to make sure that a 10007ba2e769SAlan Cox * module insertion/removal doesn't change anything 10017ba2e769SAlan Cox * under us. 10027ba2e769SAlan Cox */ 10037ba2e769SAlan Cox mutex_lock(&port->mutex); 10047ba2e769SAlan Cox retval = uart_set_info(tty, port, state, &new_serial); 1005ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1006ab4382d2SGreg Kroah-Hartman return retval; 1007ab4382d2SGreg Kroah-Hartman } 1008ab4382d2SGreg Kroah-Hartman 1009ab4382d2SGreg Kroah-Hartman /** 1010ab4382d2SGreg Kroah-Hartman * uart_get_lsr_info - get line status register info 1011ab4382d2SGreg Kroah-Hartman * @tty: tty associated with the UART 1012ab4382d2SGreg Kroah-Hartman * @state: UART being queried 1013ab4382d2SGreg Kroah-Hartman * @value: returned modem value 1014ab4382d2SGreg Kroah-Hartman */ 1015ab4382d2SGreg Kroah-Hartman static int uart_get_lsr_info(struct tty_struct *tty, 1016ab4382d2SGreg Kroah-Hartman struct uart_state *state, unsigned int __user *value) 1017ab4382d2SGreg Kroah-Hartman { 10184047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 1019ab4382d2SGreg Kroah-Hartman unsigned int result; 1020ab4382d2SGreg Kroah-Hartman 1021ab4382d2SGreg Kroah-Hartman result = uport->ops->tx_empty(uport); 1022ab4382d2SGreg Kroah-Hartman 1023ab4382d2SGreg Kroah-Hartman /* 1024ab4382d2SGreg Kroah-Hartman * If we're about to load something into the transmit 1025ab4382d2SGreg Kroah-Hartman * register, we'll pretend the transmitter isn't empty to 1026ab4382d2SGreg Kroah-Hartman * avoid a race condition (depending on when the transmit 1027ab4382d2SGreg Kroah-Hartman * interrupt happens). 1028ab4382d2SGreg Kroah-Hartman */ 1029ab4382d2SGreg Kroah-Hartman if (uport->x_char || 1030ab4382d2SGreg Kroah-Hartman ((uart_circ_chars_pending(&state->xmit) > 0) && 1031d01f4d18SPeter Hurley !uart_tx_stopped(uport))) 1032ab4382d2SGreg Kroah-Hartman result &= ~TIOCSER_TEMT; 1033ab4382d2SGreg Kroah-Hartman 1034ab4382d2SGreg Kroah-Hartman return put_user(result, value); 1035ab4382d2SGreg Kroah-Hartman } 1036ab4382d2SGreg Kroah-Hartman 103760b33c13SAlan Cox static int uart_tiocmget(struct tty_struct *tty) 1038ab4382d2SGreg Kroah-Hartman { 1039ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1040ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 10414047b371SPeter Hurley struct uart_port *uport; 1042ab4382d2SGreg Kroah-Hartman int result = -EIO; 1043ab4382d2SGreg Kroah-Hartman 1044ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 10454047b371SPeter Hurley uport = uart_port_check(state); 10464047b371SPeter Hurley if (!uport) 10474047b371SPeter Hurley goto out; 10484047b371SPeter Hurley 104918900ca6SPeter Hurley if (!tty_io_error(tty)) { 1050ab4382d2SGreg Kroah-Hartman result = uport->mctrl; 1051ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1052ab4382d2SGreg Kroah-Hartman result |= uport->ops->get_mctrl(uport); 1053ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1054ab4382d2SGreg Kroah-Hartman } 10554047b371SPeter Hurley out: 1056ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1057ab4382d2SGreg Kroah-Hartman return result; 1058ab4382d2SGreg Kroah-Hartman } 1059ab4382d2SGreg Kroah-Hartman 1060ab4382d2SGreg Kroah-Hartman static int 106120b9d177SAlan Cox uart_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear) 1062ab4382d2SGreg Kroah-Hartman { 1063ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1064ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 10654047b371SPeter Hurley struct uart_port *uport; 1066ab4382d2SGreg Kroah-Hartman int ret = -EIO; 1067ab4382d2SGreg Kroah-Hartman 1068ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 10694047b371SPeter Hurley uport = uart_port_check(state); 10704047b371SPeter Hurley if (!uport) 10714047b371SPeter Hurley goto out; 10724047b371SPeter Hurley 107318900ca6SPeter Hurley if (!tty_io_error(tty)) { 1074ab4382d2SGreg Kroah-Hartman uart_update_mctrl(uport, set, clear); 1075ab4382d2SGreg Kroah-Hartman ret = 0; 1076ab4382d2SGreg Kroah-Hartman } 10774047b371SPeter Hurley out: 1078ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1079ab4382d2SGreg Kroah-Hartman return ret; 1080ab4382d2SGreg Kroah-Hartman } 1081ab4382d2SGreg Kroah-Hartman 1082ab4382d2SGreg Kroah-Hartman static int uart_break_ctl(struct tty_struct *tty, int break_state) 1083ab4382d2SGreg Kroah-Hartman { 1084ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1085ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 10864047b371SPeter Hurley struct uart_port *uport; 10874047b371SPeter Hurley int ret = -EIO; 1088ab4382d2SGreg Kroah-Hartman 1089ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 10904047b371SPeter Hurley uport = uart_port_check(state); 10914047b371SPeter Hurley if (!uport) 10924047b371SPeter Hurley goto out; 1093ab4382d2SGreg Kroah-Hartman 1094ab4382d2SGreg Kroah-Hartman if (uport->type != PORT_UNKNOWN) 1095ab4382d2SGreg Kroah-Hartman uport->ops->break_ctl(uport, break_state); 10964047b371SPeter Hurley ret = 0; 10974047b371SPeter Hurley out: 1098ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 10994047b371SPeter Hurley return ret; 1100ab4382d2SGreg Kroah-Hartman } 1101ab4382d2SGreg Kroah-Hartman 1102ab4382d2SGreg Kroah-Hartman static int uart_do_autoconfig(struct tty_struct *tty,struct uart_state *state) 1103ab4382d2SGreg Kroah-Hartman { 1104ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 11054047b371SPeter Hurley struct uart_port *uport; 1106ab4382d2SGreg Kroah-Hartman int flags, ret; 1107ab4382d2SGreg Kroah-Hartman 1108ab4382d2SGreg Kroah-Hartman if (!capable(CAP_SYS_ADMIN)) 1109ab4382d2SGreg Kroah-Hartman return -EPERM; 1110ab4382d2SGreg Kroah-Hartman 1111ab4382d2SGreg Kroah-Hartman /* 1112ab4382d2SGreg Kroah-Hartman * Take the per-port semaphore. This prevents count from 1113ab4382d2SGreg Kroah-Hartman * changing, and hence any extra opens of the port while 1114ab4382d2SGreg Kroah-Hartman * we're auto-configuring. 1115ab4382d2SGreg Kroah-Hartman */ 1116ab4382d2SGreg Kroah-Hartman if (mutex_lock_interruptible(&port->mutex)) 1117ab4382d2SGreg Kroah-Hartman return -ERESTARTSYS; 1118ab4382d2SGreg Kroah-Hartman 11194047b371SPeter Hurley uport = uart_port_check(state); 11204047b371SPeter Hurley if (!uport) { 11214047b371SPeter Hurley ret = -EIO; 11224047b371SPeter Hurley goto out; 11234047b371SPeter Hurley } 11244047b371SPeter Hurley 1125ab4382d2SGreg Kroah-Hartman ret = -EBUSY; 1126ab4382d2SGreg Kroah-Hartman if (tty_port_users(port) == 1) { 1127ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 1128ab4382d2SGreg Kroah-Hartman 1129ab4382d2SGreg Kroah-Hartman /* 1130ab4382d2SGreg Kroah-Hartman * If we already have a port type configured, 1131ab4382d2SGreg Kroah-Hartman * we must release its resources. 1132ab4382d2SGreg Kroah-Hartman */ 1133a7cfaf16SFabio Estevam if (uport->type != PORT_UNKNOWN && uport->ops->release_port) 1134ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 1135ab4382d2SGreg Kroah-Hartman 1136ab4382d2SGreg Kroah-Hartman flags = UART_CONFIG_TYPE; 1137ab4382d2SGreg Kroah-Hartman if (uport->flags & UPF_AUTO_IRQ) 1138ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_IRQ; 1139ab4382d2SGreg Kroah-Hartman 1140ab4382d2SGreg Kroah-Hartman /* 1141ab4382d2SGreg Kroah-Hartman * This will claim the ports resources if 1142ab4382d2SGreg Kroah-Hartman * a port is found. 1143ab4382d2SGreg Kroah-Hartman */ 1144ab4382d2SGreg Kroah-Hartman uport->ops->config_port(uport, flags); 1145ab4382d2SGreg Kroah-Hartman 1146ab4382d2SGreg Kroah-Hartman ret = uart_startup(tty, state, 1); 114771456906SSebastian Andrzej Siewior if (ret == 0) 114871456906SSebastian Andrzej Siewior tty_port_set_initialized(port, true); 1149b3b57646SRob Herring if (ret > 0) 1150b3b57646SRob Herring ret = 0; 1151ab4382d2SGreg Kroah-Hartman } 11524047b371SPeter Hurley out: 1153ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1154ab4382d2SGreg Kroah-Hartman return ret; 1155ab4382d2SGreg Kroah-Hartman } 1156ab4382d2SGreg Kroah-Hartman 11571fdc3106SAlexander Shiyan static void uart_enable_ms(struct uart_port *uport) 11581fdc3106SAlexander Shiyan { 11591fdc3106SAlexander Shiyan /* 11601fdc3106SAlexander Shiyan * Force modem status interrupts on 11611fdc3106SAlexander Shiyan */ 11621fdc3106SAlexander Shiyan if (uport->ops->enable_ms) 11631fdc3106SAlexander Shiyan uport->ops->enable_ms(uport); 11641fdc3106SAlexander Shiyan } 11651fdc3106SAlexander Shiyan 1166ab4382d2SGreg Kroah-Hartman /* 1167ab4382d2SGreg Kroah-Hartman * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change 1168ab4382d2SGreg Kroah-Hartman * - mask passed in arg for lines of interest 1169ab4382d2SGreg Kroah-Hartman * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) 1170ab4382d2SGreg Kroah-Hartman * Caller should use TIOCGICOUNT to see which one it was 1171ab4382d2SGreg Kroah-Hartman * 1172ab4382d2SGreg Kroah-Hartman * FIXME: This wants extracting into a common all driver implementation 1173ab4382d2SGreg Kroah-Hartman * of TIOCMWAIT using tty_port. 1174ab4382d2SGreg Kroah-Hartman */ 11759ed19428SPeter Hurley static int uart_wait_modem_status(struct uart_state *state, unsigned long arg) 1176ab4382d2SGreg Kroah-Hartman { 11779ed19428SPeter Hurley struct uart_port *uport; 1178ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1179ab4382d2SGreg Kroah-Hartman DECLARE_WAITQUEUE(wait, current); 1180ab4382d2SGreg Kroah-Hartman struct uart_icount cprev, cnow; 1181ab4382d2SGreg Kroah-Hartman int ret; 1182ab4382d2SGreg Kroah-Hartman 1183ab4382d2SGreg Kroah-Hartman /* 1184ab4382d2SGreg Kroah-Hartman * note the counters on entry 1185ab4382d2SGreg Kroah-Hartman */ 11869ed19428SPeter Hurley uport = uart_port_ref(state); 11879ed19428SPeter Hurley if (!uport) 11889ed19428SPeter Hurley return -EIO; 1189ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1190ab4382d2SGreg Kroah-Hartman memcpy(&cprev, &uport->icount, sizeof(struct uart_icount)); 11911fdc3106SAlexander Shiyan uart_enable_ms(uport); 1192ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1193ab4382d2SGreg Kroah-Hartman 1194ab4382d2SGreg Kroah-Hartman add_wait_queue(&port->delta_msr_wait, &wait); 1195ab4382d2SGreg Kroah-Hartman for (;;) { 1196ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1197ab4382d2SGreg Kroah-Hartman memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); 1198ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1199ab4382d2SGreg Kroah-Hartman 1200ab4382d2SGreg Kroah-Hartman set_current_state(TASK_INTERRUPTIBLE); 1201ab4382d2SGreg Kroah-Hartman 1202ab4382d2SGreg Kroah-Hartman if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || 1203ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || 1204ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || 1205ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) { 1206ab4382d2SGreg Kroah-Hartman ret = 0; 1207ab4382d2SGreg Kroah-Hartman break; 1208ab4382d2SGreg Kroah-Hartman } 1209ab4382d2SGreg Kroah-Hartman 1210ab4382d2SGreg Kroah-Hartman schedule(); 1211ab4382d2SGreg Kroah-Hartman 1212ab4382d2SGreg Kroah-Hartman /* see if a signal did it */ 1213ab4382d2SGreg Kroah-Hartman if (signal_pending(current)) { 1214ab4382d2SGreg Kroah-Hartman ret = -ERESTARTSYS; 1215ab4382d2SGreg Kroah-Hartman break; 1216ab4382d2SGreg Kroah-Hartman } 1217ab4382d2SGreg Kroah-Hartman 1218ab4382d2SGreg Kroah-Hartman cprev = cnow; 1219ab4382d2SGreg Kroah-Hartman } 122097f9f707SFabian Frederick __set_current_state(TASK_RUNNING); 1221ab4382d2SGreg Kroah-Hartman remove_wait_queue(&port->delta_msr_wait, &wait); 12229ed19428SPeter Hurley uart_port_deref(uport); 1223ab4382d2SGreg Kroah-Hartman 1224ab4382d2SGreg Kroah-Hartman return ret; 1225ab4382d2SGreg Kroah-Hartman } 1226ab4382d2SGreg Kroah-Hartman 1227ab4382d2SGreg Kroah-Hartman /* 1228ab4382d2SGreg Kroah-Hartman * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) 1229ab4382d2SGreg Kroah-Hartman * Return: write counters to the user passed counter struct 1230ab4382d2SGreg Kroah-Hartman * NB: both 1->0 and 0->1 transitions are counted except for 1231ab4382d2SGreg Kroah-Hartman * RI where only 0->1 is counted. 1232ab4382d2SGreg Kroah-Hartman */ 1233ab4382d2SGreg Kroah-Hartman static int uart_get_icount(struct tty_struct *tty, 1234ab4382d2SGreg Kroah-Hartman struct serial_icounter_struct *icount) 1235ab4382d2SGreg Kroah-Hartman { 1236ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1237ab4382d2SGreg Kroah-Hartman struct uart_icount cnow; 12389ed19428SPeter Hurley struct uart_port *uport; 1239ab4382d2SGreg Kroah-Hartman 12409ed19428SPeter Hurley uport = uart_port_ref(state); 12419ed19428SPeter Hurley if (!uport) 12429ed19428SPeter Hurley return -EIO; 1243ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1244ab4382d2SGreg Kroah-Hartman memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); 1245ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 12469ed19428SPeter Hurley uart_port_deref(uport); 1247ab4382d2SGreg Kroah-Hartman 1248ab4382d2SGreg Kroah-Hartman icount->cts = cnow.cts; 1249ab4382d2SGreg Kroah-Hartman icount->dsr = cnow.dsr; 1250ab4382d2SGreg Kroah-Hartman icount->rng = cnow.rng; 1251ab4382d2SGreg Kroah-Hartman icount->dcd = cnow.dcd; 1252ab4382d2SGreg Kroah-Hartman icount->rx = cnow.rx; 1253ab4382d2SGreg Kroah-Hartman icount->tx = cnow.tx; 1254ab4382d2SGreg Kroah-Hartman icount->frame = cnow.frame; 1255ab4382d2SGreg Kroah-Hartman icount->overrun = cnow.overrun; 1256ab4382d2SGreg Kroah-Hartman icount->parity = cnow.parity; 1257ab4382d2SGreg Kroah-Hartman icount->brk = cnow.brk; 1258ab4382d2SGreg Kroah-Hartman icount->buf_overrun = cnow.buf_overrun; 1259ab4382d2SGreg Kroah-Hartman 1260ab4382d2SGreg Kroah-Hartman return 0; 1261ab4382d2SGreg Kroah-Hartman } 1262ab4382d2SGreg Kroah-Hartman 1263a5f276f1SRicardo Ribalda Delgado static int uart_get_rs485_config(struct uart_port *port, 1264a5f276f1SRicardo Ribalda Delgado struct serial_rs485 __user *rs485) 1265a5f276f1SRicardo Ribalda Delgado { 1266bd737f87SRicardo Ribalda Delgado unsigned long flags; 1267bd737f87SRicardo Ribalda Delgado struct serial_rs485 aux; 1268bd737f87SRicardo Ribalda Delgado 1269bd737f87SRicardo Ribalda Delgado spin_lock_irqsave(&port->lock, flags); 1270bd737f87SRicardo Ribalda Delgado aux = port->rs485; 1271bd737f87SRicardo Ribalda Delgado spin_unlock_irqrestore(&port->lock, flags); 1272bd737f87SRicardo Ribalda Delgado 1273bd737f87SRicardo Ribalda Delgado if (copy_to_user(rs485, &aux, sizeof(aux))) 1274a5f276f1SRicardo Ribalda Delgado return -EFAULT; 1275bd737f87SRicardo Ribalda Delgado 1276a5f276f1SRicardo Ribalda Delgado return 0; 1277a5f276f1SRicardo Ribalda Delgado } 1278a5f276f1SRicardo Ribalda Delgado 1279a5f276f1SRicardo Ribalda Delgado static int uart_set_rs485_config(struct uart_port *port, 1280a5f276f1SRicardo Ribalda Delgado struct serial_rs485 __user *rs485_user) 1281a5f276f1SRicardo Ribalda Delgado { 1282a5f276f1SRicardo Ribalda Delgado struct serial_rs485 rs485; 1283a5f276f1SRicardo Ribalda Delgado int ret; 1284bd737f87SRicardo Ribalda Delgado unsigned long flags; 1285a5f276f1SRicardo Ribalda Delgado 1286a5f276f1SRicardo Ribalda Delgado if (!port->rs485_config) 1287a5f276f1SRicardo Ribalda Delgado return -ENOIOCTLCMD; 1288a5f276f1SRicardo Ribalda Delgado 1289a5f276f1SRicardo Ribalda Delgado if (copy_from_user(&rs485, rs485_user, sizeof(*rs485_user))) 1290a5f276f1SRicardo Ribalda Delgado return -EFAULT; 1291a5f276f1SRicardo Ribalda Delgado 1292bd737f87SRicardo Ribalda Delgado spin_lock_irqsave(&port->lock, flags); 1293a5f276f1SRicardo Ribalda Delgado ret = port->rs485_config(port, &rs485); 1294bd737f87SRicardo Ribalda Delgado spin_unlock_irqrestore(&port->lock, flags); 1295a5f276f1SRicardo Ribalda Delgado if (ret) 1296a5f276f1SRicardo Ribalda Delgado return ret; 1297a5f276f1SRicardo Ribalda Delgado 1298a5f276f1SRicardo Ribalda Delgado if (copy_to_user(rs485_user, &port->rs485, sizeof(port->rs485))) 1299a5f276f1SRicardo Ribalda Delgado return -EFAULT; 1300a5f276f1SRicardo Ribalda Delgado 1301a5f276f1SRicardo Ribalda Delgado return 0; 1302a5f276f1SRicardo Ribalda Delgado } 1303a5f276f1SRicardo Ribalda Delgado 1304ab4382d2SGreg Kroah-Hartman /* 1305ab4382d2SGreg Kroah-Hartman * Called via sys_ioctl. We can use spin_lock_irq() here. 1306ab4382d2SGreg Kroah-Hartman */ 1307ab4382d2SGreg Kroah-Hartman static int 13084047b371SPeter Hurley uart_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg) 1309ab4382d2SGreg Kroah-Hartman { 1310ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1311ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 13124047b371SPeter Hurley struct uart_port *uport; 1313ab4382d2SGreg Kroah-Hartman void __user *uarg = (void __user *)arg; 1314ab4382d2SGreg Kroah-Hartman int ret = -ENOIOCTLCMD; 1315ab4382d2SGreg Kroah-Hartman 1316ab4382d2SGreg Kroah-Hartman 1317ab4382d2SGreg Kroah-Hartman /* 1318ab4382d2SGreg Kroah-Hartman * These ioctls don't rely on the hardware to be present. 1319ab4382d2SGreg Kroah-Hartman */ 1320ab4382d2SGreg Kroah-Hartman switch (cmd) { 1321ab4382d2SGreg Kroah-Hartman case TIOCGSERIAL: 13229f109694SAlan Cox ret = uart_get_info_user(port, uarg); 1323ab4382d2SGreg Kroah-Hartman break; 1324ab4382d2SGreg Kroah-Hartman 1325ab4382d2SGreg Kroah-Hartman case TIOCSSERIAL: 13267c8ab967SPeter Hurley down_write(&tty->termios_rwsem); 13277ba2e769SAlan Cox ret = uart_set_info_user(tty, state, uarg); 13287c8ab967SPeter Hurley up_write(&tty->termios_rwsem); 1329ab4382d2SGreg Kroah-Hartman break; 1330ab4382d2SGreg Kroah-Hartman 1331ab4382d2SGreg Kroah-Hartman case TIOCSERCONFIG: 13327c8ab967SPeter Hurley down_write(&tty->termios_rwsem); 1333ab4382d2SGreg Kroah-Hartman ret = uart_do_autoconfig(tty, state); 13347c8ab967SPeter Hurley up_write(&tty->termios_rwsem); 1335ab4382d2SGreg Kroah-Hartman break; 1336ab4382d2SGreg Kroah-Hartman 1337ab4382d2SGreg Kroah-Hartman case TIOCSERGWILD: /* obsolete */ 1338ab4382d2SGreg Kroah-Hartman case TIOCSERSWILD: /* obsolete */ 1339ab4382d2SGreg Kroah-Hartman ret = 0; 1340ab4382d2SGreg Kroah-Hartman break; 1341ab4382d2SGreg Kroah-Hartman } 1342ab4382d2SGreg Kroah-Hartman 1343ab4382d2SGreg Kroah-Hartman if (ret != -ENOIOCTLCMD) 1344ab4382d2SGreg Kroah-Hartman goto out; 1345ab4382d2SGreg Kroah-Hartman 134618900ca6SPeter Hurley if (tty_io_error(tty)) { 1347ab4382d2SGreg Kroah-Hartman ret = -EIO; 1348ab4382d2SGreg Kroah-Hartman goto out; 1349ab4382d2SGreg Kroah-Hartman } 1350ab4382d2SGreg Kroah-Hartman 1351ab4382d2SGreg Kroah-Hartman /* 1352ab4382d2SGreg Kroah-Hartman * The following should only be used when hardware is present. 1353ab4382d2SGreg Kroah-Hartman */ 1354ab4382d2SGreg Kroah-Hartman switch (cmd) { 1355ab4382d2SGreg Kroah-Hartman case TIOCMIWAIT: 1356ab4382d2SGreg Kroah-Hartman ret = uart_wait_modem_status(state, arg); 1357ab4382d2SGreg Kroah-Hartman break; 1358ab4382d2SGreg Kroah-Hartman } 1359ab4382d2SGreg Kroah-Hartman 1360ab4382d2SGreg Kroah-Hartman if (ret != -ENOIOCTLCMD) 1361ab4382d2SGreg Kroah-Hartman goto out; 1362ab4382d2SGreg Kroah-Hartman 1363ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 13644047b371SPeter Hurley uport = uart_port_check(state); 1365ab4382d2SGreg Kroah-Hartman 13664047b371SPeter Hurley if (!uport || tty_io_error(tty)) { 1367ab4382d2SGreg Kroah-Hartman ret = -EIO; 1368ab4382d2SGreg Kroah-Hartman goto out_up; 1369ab4382d2SGreg Kroah-Hartman } 1370ab4382d2SGreg Kroah-Hartman 1371ab4382d2SGreg Kroah-Hartman /* 1372ab4382d2SGreg Kroah-Hartman * All these rely on hardware being present and need to be 1373ab4382d2SGreg Kroah-Hartman * protected against the tty being hung up. 1374ab4382d2SGreg Kroah-Hartman */ 1375a9c20a9cSRicardo Ribalda Delgado 1376ab4382d2SGreg Kroah-Hartman switch (cmd) { 1377a9c20a9cSRicardo Ribalda Delgado case TIOCSERGETLSR: /* Get line status register */ 1378a9c20a9cSRicardo Ribalda Delgado ret = uart_get_lsr_info(tty, state, uarg); 1379a9c20a9cSRicardo Ribalda Delgado break; 1380a9c20a9cSRicardo Ribalda Delgado 1381a5f276f1SRicardo Ribalda Delgado case TIOCGRS485: 13824047b371SPeter Hurley ret = uart_get_rs485_config(uport, uarg); 1383a5f276f1SRicardo Ribalda Delgado break; 1384a5f276f1SRicardo Ribalda Delgado 1385a5f276f1SRicardo Ribalda Delgado case TIOCSRS485: 13864047b371SPeter Hurley ret = uart_set_rs485_config(uport, uarg); 1387a5f276f1SRicardo Ribalda Delgado break; 13884047b371SPeter Hurley default: 1389ab4382d2SGreg Kroah-Hartman if (uport->ops->ioctl) 1390ab4382d2SGreg Kroah-Hartman ret = uport->ops->ioctl(uport, cmd, arg); 1391ab4382d2SGreg Kroah-Hartman break; 1392ab4382d2SGreg Kroah-Hartman } 1393ab4382d2SGreg Kroah-Hartman out_up: 1394ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1395ab4382d2SGreg Kroah-Hartman out: 1396ab4382d2SGreg Kroah-Hartman return ret; 1397ab4382d2SGreg Kroah-Hartman } 1398ab4382d2SGreg Kroah-Hartman 1399ab4382d2SGreg Kroah-Hartman static void uart_set_ldisc(struct tty_struct *tty) 1400ab4382d2SGreg Kroah-Hartman { 1401ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 14024047b371SPeter Hurley struct uart_port *uport; 1403ab4382d2SGreg Kroah-Hartman 1404db1b9dfcSPeter Hurley mutex_lock(&state->port.mutex); 14054047b371SPeter Hurley uport = uart_port_check(state); 14064047b371SPeter Hurley if (uport && uport->ops->set_ldisc) 1407732a84a0SPeter Hurley uport->ops->set_ldisc(uport, &tty->termios); 1408db1b9dfcSPeter Hurley mutex_unlock(&state->port.mutex); 1409db1b9dfcSPeter Hurley } 1410ab4382d2SGreg Kroah-Hartman 1411ab4382d2SGreg Kroah-Hartman static void uart_set_termios(struct tty_struct *tty, 1412ab4382d2SGreg Kroah-Hartman struct ktermios *old_termios) 1413ab4382d2SGreg Kroah-Hartman { 1414ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 14154047b371SPeter Hurley struct uart_port *uport; 1416adc8d746SAlan Cox unsigned int cflag = tty->termios.c_cflag; 14172cbacafdSRussell King unsigned int iflag_mask = IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK; 14182cbacafdSRussell King bool sw_changed = false; 1419ab4382d2SGreg Kroah-Hartman 14204047b371SPeter Hurley mutex_lock(&state->port.mutex); 14214047b371SPeter Hurley uport = uart_port_check(state); 14224047b371SPeter Hurley if (!uport) 14234047b371SPeter Hurley goto out; 14244047b371SPeter Hurley 14252cbacafdSRussell King /* 14262cbacafdSRussell King * Drivers doing software flow control also need to know 14272cbacafdSRussell King * about changes to these input settings. 14282cbacafdSRussell King */ 14292cbacafdSRussell King if (uport->flags & UPF_SOFT_FLOW) { 14302cbacafdSRussell King iflag_mask |= IXANY|IXON|IXOFF; 14312cbacafdSRussell King sw_changed = 14322cbacafdSRussell King tty->termios.c_cc[VSTART] != old_termios->c_cc[VSTART] || 14332cbacafdSRussell King tty->termios.c_cc[VSTOP] != old_termios->c_cc[VSTOP]; 14342cbacafdSRussell King } 1435ab4382d2SGreg Kroah-Hartman 1436ab4382d2SGreg Kroah-Hartman /* 1437ab4382d2SGreg Kroah-Hartman * These are the bits that are used to setup various 1438ab4382d2SGreg Kroah-Hartman * flags in the low level driver. We can ignore the Bfoo 1439ab4382d2SGreg Kroah-Hartman * bits in c_cflag; c_[io]speed will always be set 1440ab4382d2SGreg Kroah-Hartman * appropriately by set_termios() in tty_ioctl.c 1441ab4382d2SGreg Kroah-Hartman */ 1442ab4382d2SGreg Kroah-Hartman if ((cflag ^ old_termios->c_cflag) == 0 && 1443adc8d746SAlan Cox tty->termios.c_ospeed == old_termios->c_ospeed && 1444adc8d746SAlan Cox tty->termios.c_ispeed == old_termios->c_ispeed && 14452cbacafdSRussell King ((tty->termios.c_iflag ^ old_termios->c_iflag) & iflag_mask) == 0 && 14462cbacafdSRussell King !sw_changed) { 14474047b371SPeter Hurley goto out; 1448ab4382d2SGreg Kroah-Hartman } 1449ab4382d2SGreg Kroah-Hartman 1450ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, old_termios); 1451c18b55fdSPeter Hurley /* reload cflag from termios; port driver may have overriden flags */ 1452c18b55fdSPeter Hurley cflag = tty->termios.c_cflag; 1453ab4382d2SGreg Kroah-Hartman 1454ab4382d2SGreg Kroah-Hartman /* Handle transition to B0 status */ 1455ab4382d2SGreg Kroah-Hartman if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) 1456dec94e70SRussell King uart_clear_mctrl(uport, TIOCM_RTS | TIOCM_DTR); 1457ab4382d2SGreg Kroah-Hartman /* Handle transition away from B0 status */ 1458ab4382d2SGreg Kroah-Hartman else if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { 1459ab4382d2SGreg Kroah-Hartman unsigned int mask = TIOCM_DTR; 146097ef38b8SPeter Hurley if (!(cflag & CRTSCTS) || !tty_throttled(tty)) 1461ab4382d2SGreg Kroah-Hartman mask |= TIOCM_RTS; 1462dec94e70SRussell King uart_set_mctrl(uport, mask); 1463ab4382d2SGreg Kroah-Hartman } 14644047b371SPeter Hurley out: 14654047b371SPeter Hurley mutex_unlock(&state->port.mutex); 1466ab4382d2SGreg Kroah-Hartman } 1467ab4382d2SGreg Kroah-Hartman 1468ab4382d2SGreg Kroah-Hartman /* 1469ef4f527cSKevin Cernekee * Calls to uart_close() are serialised via the tty_lock in 1470ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:tty_release() 1471ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:do_tty_hangup() 1472ab4382d2SGreg Kroah-Hartman */ 1473ab4382d2SGreg Kroah-Hartman static void uart_close(struct tty_struct *tty, struct file *filp) 1474ab4382d2SGreg Kroah-Hartman { 1475ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1476ab4382d2SGreg Kroah-Hartman 147791b32f54SPeter Hurley if (!state) { 147891b32f54SPeter Hurley struct uart_driver *drv = tty->driver->driver_state; 14799356335fSColin Ian King struct tty_port *port; 148091b32f54SPeter Hurley 148191b32f54SPeter Hurley state = drv->state + tty->index; 148291b32f54SPeter Hurley port = &state->port; 148391b32f54SPeter Hurley spin_lock_irq(&port->lock); 148491b32f54SPeter Hurley --port->count; 148591b32f54SPeter Hurley spin_unlock_irq(&port->lock); 1486ab4382d2SGreg Kroah-Hartman return; 148791b32f54SPeter Hurley } 1488ab4382d2SGreg Kroah-Hartman 148939b3d892SPeter Hurley pr_debug("uart_close(%d) called\n", tty->index); 1490ab4382d2SGreg Kroah-Hartman 1491761ed4a9SRob Herring tty_port_close(tty->port, tty, filp); 1492761ed4a9SRob Herring } 1493ab4382d2SGreg Kroah-Hartman 1494761ed4a9SRob Herring static void uart_tty_port_shutdown(struct tty_port *port) 1495761ed4a9SRob Herring { 1496761ed4a9SRob Herring struct uart_state *state = container_of(port, struct uart_state, port); 1497761ed4a9SRob Herring struct uart_port *uport = uart_port_check(state); 1498af224ca2SPeter Hurley 1499ab4382d2SGreg Kroah-Hartman /* 1500ab4382d2SGreg Kroah-Hartman * At this point, we stop accepting input. To do this, we 1501ab4382d2SGreg Kroah-Hartman * disable the receive line status interrupts. 1502ab4382d2SGreg Kroah-Hartman */ 1503a5a2b130SAndy Shevchenko if (WARN(!uport, "detached port still initialized!\n")) 1504a5a2b130SAndy Shevchenko return; 1505761ed4a9SRob Herring 1506a5a2b130SAndy Shevchenko spin_lock_irq(&uport->lock); 1507ab4382d2SGreg Kroah-Hartman uport->ops->stop_rx(uport); 15086fb98fb3SPeter Hurley spin_unlock_irq(&uport->lock); 1509761ed4a9SRob Herring 1510761ed4a9SRob Herring uart_port_shutdown(port); 1511761ed4a9SRob Herring 1512ab4382d2SGreg Kroah-Hartman /* 1513761ed4a9SRob Herring * It's possible for shutdown to be called after suspend if we get 1514761ed4a9SRob Herring * a DCD drop (hangup) at just the right time. Clear suspended bit so 1515761ed4a9SRob Herring * we don't try to resume a port that has been shutdown. 1516ab4382d2SGreg Kroah-Hartman */ 1517761ed4a9SRob Herring tty_port_set_suspended(port, 0); 1518ab4382d2SGreg Kroah-Hartman 15196f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_OFF); 1520ab4382d2SGreg Kroah-Hartman 1521ab4382d2SGreg Kroah-Hartman } 1522ab4382d2SGreg Kroah-Hartman 15231f33a51dSJiri Slaby static void uart_wait_until_sent(struct tty_struct *tty, int timeout) 1524ab4382d2SGreg Kroah-Hartman { 15251f33a51dSJiri Slaby struct uart_state *state = tty->driver_data; 15269ed19428SPeter Hurley struct uart_port *port; 1527ab4382d2SGreg Kroah-Hartman unsigned long char_time, expire; 1528ab4382d2SGreg Kroah-Hartman 15299ed19428SPeter Hurley port = uart_port_ref(state); 1530ef510beaSAndy Shevchenko if (!port) 1531ef510beaSAndy Shevchenko return; 1532ef510beaSAndy Shevchenko 1533ef510beaSAndy Shevchenko if (port->type == PORT_UNKNOWN || port->fifosize == 0) { 15349ed19428SPeter Hurley uart_port_deref(port); 1535ab4382d2SGreg Kroah-Hartman return; 15369ed19428SPeter Hurley } 1537ab4382d2SGreg Kroah-Hartman 1538ab4382d2SGreg Kroah-Hartman /* 1539ab4382d2SGreg Kroah-Hartman * Set the check interval to be 1/5 of the estimated time to 1540ab4382d2SGreg Kroah-Hartman * send a single character, and make it at least 1. The check 1541ab4382d2SGreg Kroah-Hartman * interval should also be less than the timeout. 1542ab4382d2SGreg Kroah-Hartman * 1543ab4382d2SGreg Kroah-Hartman * Note: we have to use pretty tight timings here to satisfy 1544ab4382d2SGreg Kroah-Hartman * the NIST-PCTS. 1545ab4382d2SGreg Kroah-Hartman */ 1546ab4382d2SGreg Kroah-Hartman char_time = (port->timeout - HZ/50) / port->fifosize; 1547ab4382d2SGreg Kroah-Hartman char_time = char_time / 5; 1548ab4382d2SGreg Kroah-Hartman if (char_time == 0) 1549ab4382d2SGreg Kroah-Hartman char_time = 1; 1550ab4382d2SGreg Kroah-Hartman if (timeout && timeout < char_time) 1551ab4382d2SGreg Kroah-Hartman char_time = timeout; 1552ab4382d2SGreg Kroah-Hartman 1553ab4382d2SGreg Kroah-Hartman /* 1554ab4382d2SGreg Kroah-Hartman * If the transmitter hasn't cleared in twice the approximate 1555ab4382d2SGreg Kroah-Hartman * amount of time to send the entire FIFO, it probably won't 1556ab4382d2SGreg Kroah-Hartman * ever clear. This assumes the UART isn't doing flow 1557ab4382d2SGreg Kroah-Hartman * control, which is currently the case. Hence, if it ever 1558ab4382d2SGreg Kroah-Hartman * takes longer than port->timeout, this is probably due to a 1559ab4382d2SGreg Kroah-Hartman * UART bug of some kind. So, we clamp the timeout parameter at 1560ab4382d2SGreg Kroah-Hartman * 2*port->timeout. 1561ab4382d2SGreg Kroah-Hartman */ 1562ab4382d2SGreg Kroah-Hartman if (timeout == 0 || timeout > 2 * port->timeout) 1563ab4382d2SGreg Kroah-Hartman timeout = 2 * port->timeout; 1564ab4382d2SGreg Kroah-Hartman 1565ab4382d2SGreg Kroah-Hartman expire = jiffies + timeout; 1566ab4382d2SGreg Kroah-Hartman 1567ab4382d2SGreg Kroah-Hartman pr_debug("uart_wait_until_sent(%d), jiffies=%lu, expire=%lu...\n", 1568ab4382d2SGreg Kroah-Hartman port->line, jiffies, expire); 1569ab4382d2SGreg Kroah-Hartman 1570ab4382d2SGreg Kroah-Hartman /* 1571ab4382d2SGreg Kroah-Hartman * Check whether the transmitter is empty every 'char_time'. 1572ab4382d2SGreg Kroah-Hartman * 'timeout' / 'expire' give us the maximum amount of time 1573ab4382d2SGreg Kroah-Hartman * we wait. 1574ab4382d2SGreg Kroah-Hartman */ 1575ab4382d2SGreg Kroah-Hartman while (!port->ops->tx_empty(port)) { 1576ab4382d2SGreg Kroah-Hartman msleep_interruptible(jiffies_to_msecs(char_time)); 1577ab4382d2SGreg Kroah-Hartman if (signal_pending(current)) 1578ab4382d2SGreg Kroah-Hartman break; 1579ab4382d2SGreg Kroah-Hartman if (time_after(jiffies, expire)) 1580ab4382d2SGreg Kroah-Hartman break; 1581ab4382d2SGreg Kroah-Hartman } 15829ed19428SPeter Hurley uart_port_deref(port); 1583ab4382d2SGreg Kroah-Hartman } 1584ab4382d2SGreg Kroah-Hartman 1585ab4382d2SGreg Kroah-Hartman /* 1586ef4f527cSKevin Cernekee * Calls to uart_hangup() are serialised by the tty_lock in 1587ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:do_tty_hangup() 1588ef4f527cSKevin Cernekee * This runs from a workqueue and can sleep for a _short_ time only. 1589ab4382d2SGreg Kroah-Hartman */ 1590ab4382d2SGreg Kroah-Hartman static void uart_hangup(struct tty_struct *tty) 1591ab4382d2SGreg Kroah-Hartman { 1592ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1593ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1594af224ca2SPeter Hurley struct uart_port *uport; 1595ab4382d2SGreg Kroah-Hartman unsigned long flags; 1596ab4382d2SGreg Kroah-Hartman 159739b3d892SPeter Hurley pr_debug("uart_hangup(%d)\n", tty->index); 1598ab4382d2SGreg Kroah-Hartman 1599ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1600af224ca2SPeter Hurley uport = uart_port_check(state); 1601af224ca2SPeter Hurley WARN(!uport, "hangup of detached port!\n"); 1602af224ca2SPeter Hurley 1603807c8d81SPeter Hurley if (tty_port_active(port)) { 1604ab4382d2SGreg Kroah-Hartman uart_flush_buffer(tty); 1605ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 1606ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 1607ab4382d2SGreg Kroah-Hartman port->count = 0; 1608ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 1609807c8d81SPeter Hurley tty_port_set_active(port, 0); 1610ab4382d2SGreg Kroah-Hartman tty_port_tty_set(port, NULL); 1611af224ca2SPeter Hurley if (uport && !uart_console(uport)) 1612bf903c0cSGeert Uytterhoeven uart_change_pm(state, UART_PM_STATE_OFF); 1613ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->open_wait); 1614ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->delta_msr_wait); 1615ab4382d2SGreg Kroah-Hartman } 1616ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1617ab4382d2SGreg Kroah-Hartman } 1618ab4382d2SGreg Kroah-Hartman 1619af224ca2SPeter Hurley /* uport == NULL if uart_port has already been removed */ 16200b1db830SJiri Slaby static void uart_port_shutdown(struct tty_port *port) 16210b1db830SJiri Slaby { 1622b922e19dSJiri Slaby struct uart_state *state = container_of(port, struct uart_state, port); 16234047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 1624b922e19dSJiri Slaby 1625b922e19dSJiri Slaby /* 1626b922e19dSJiri Slaby * clear delta_msr_wait queue to avoid mem leaks: we may free 1627b922e19dSJiri Slaby * the irq here so the queue might never be woken up. Note 1628b922e19dSJiri Slaby * that we won't end up waiting on delta_msr_wait again since 1629b922e19dSJiri Slaby * any outstanding file descriptors should be pointing at 1630b922e19dSJiri Slaby * hung_up_tty_fops now. 1631b922e19dSJiri Slaby */ 1632b922e19dSJiri Slaby wake_up_interruptible(&port->delta_msr_wait); 1633b922e19dSJiri Slaby 1634b922e19dSJiri Slaby /* 1635b922e19dSJiri Slaby * Free the IRQ and disable the port. 1636b922e19dSJiri Slaby */ 1637af224ca2SPeter Hurley if (uport) 1638b922e19dSJiri Slaby uport->ops->shutdown(uport); 1639b922e19dSJiri Slaby 1640b922e19dSJiri Slaby /* 1641b922e19dSJiri Slaby * Ensure that the IRQ handler isn't running on another CPU. 1642b922e19dSJiri Slaby */ 1643af224ca2SPeter Hurley if (uport) 1644b922e19dSJiri Slaby synchronize_irq(uport->irq); 16450b1db830SJiri Slaby } 16460b1db830SJiri Slaby 1647ab4382d2SGreg Kroah-Hartman static int uart_carrier_raised(struct tty_port *port) 1648ab4382d2SGreg Kroah-Hartman { 1649ab4382d2SGreg Kroah-Hartman struct uart_state *state = container_of(port, struct uart_state, port); 16509ed19428SPeter Hurley struct uart_port *uport; 1651ab4382d2SGreg Kroah-Hartman int mctrl; 16529ed19428SPeter Hurley 16539ed19428SPeter Hurley uport = uart_port_ref(state); 16549ed19428SPeter Hurley /* 16559ed19428SPeter Hurley * Should never observe uport == NULL since checks for hangup should 16569ed19428SPeter Hurley * abort the tty_port_block_til_ready() loop before checking for carrier 16579ed19428SPeter Hurley * raised -- but report carrier raised if it does anyway so open will 16589ed19428SPeter Hurley * continue and not sleep 16599ed19428SPeter Hurley */ 16609ed19428SPeter Hurley if (WARN_ON(!uport)) 16619ed19428SPeter Hurley return 1; 1662ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 16631fdc3106SAlexander Shiyan uart_enable_ms(uport); 1664ab4382d2SGreg Kroah-Hartman mctrl = uport->ops->get_mctrl(uport); 1665ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 16669ed19428SPeter Hurley uart_port_deref(uport); 1667ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_CAR) 1668ab4382d2SGreg Kroah-Hartman return 1; 1669ab4382d2SGreg Kroah-Hartman return 0; 1670ab4382d2SGreg Kroah-Hartman } 1671ab4382d2SGreg Kroah-Hartman 1672a6845e1eSRafael Gago static void uart_dtr_rts(struct tty_port *port, int raise) 1673ab4382d2SGreg Kroah-Hartman { 1674ab4382d2SGreg Kroah-Hartman struct uart_state *state = container_of(port, struct uart_state, port); 16759ed19428SPeter Hurley struct uart_port *uport; 16769ed19428SPeter Hurley 16779ed19428SPeter Hurley uport = uart_port_ref(state); 16789ed19428SPeter Hurley if (!uport) 16799ed19428SPeter Hurley return; 1680a6845e1eSRafael Gago uart_port_dtr_rts(uport, raise); 16819ed19428SPeter Hurley uart_port_deref(uport); 1682ab4382d2SGreg Kroah-Hartman } 1683ab4382d2SGreg Kroah-Hartman 1684ab4382d2SGreg Kroah-Hartman /* 1685ef4f527cSKevin Cernekee * Calls to uart_open are serialised by the tty_lock in 1686ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:tty_open() 1687ab4382d2SGreg Kroah-Hartman * Note that if this fails, then uart_close() _will_ be called. 1688ab4382d2SGreg Kroah-Hartman * 1689ab4382d2SGreg Kroah-Hartman * In time, we want to scrap the "opening nonpresent ports" 1690ab4382d2SGreg Kroah-Hartman * behaviour and implement an alternative way for setserial 1691ab4382d2SGreg Kroah-Hartman * to set base addresses/ports/types. This will allow us to 1692ab4382d2SGreg Kroah-Hartman * get rid of a certain amount of extra tests. 1693ab4382d2SGreg Kroah-Hartman */ 1694ab4382d2SGreg Kroah-Hartman static int uart_open(struct tty_struct *tty, struct file *filp) 1695ab4382d2SGreg Kroah-Hartman { 16965e388027SPeter Hurley struct uart_driver *drv = tty->driver->driver_state; 1697ab4382d2SGreg Kroah-Hartman int retval, line = tty->index; 16981c7b13c4SJiri Slaby struct uart_state *state = drv->state + line; 1699ab4382d2SGreg Kroah-Hartman 1700ab4382d2SGreg Kroah-Hartman tty->driver_data = state; 1701b3b57646SRob Herring 1702b3b57646SRob Herring retval = tty_port_open(&state->port, tty, filp); 1703b3b57646SRob Herring if (retval > 0) 1704b3b57646SRob Herring retval = 0; 1705b3b57646SRob Herring 1706b3b57646SRob Herring return retval; 1707b3b57646SRob Herring } 1708b3b57646SRob Herring 1709b3b57646SRob Herring static int uart_port_activate(struct tty_port *port, struct tty_struct *tty) 1710b3b57646SRob Herring { 1711b3b57646SRob Herring struct uart_state *state = container_of(port, struct uart_state, port); 1712b3b57646SRob Herring struct uart_port *uport; 1713b3b57646SRob Herring 1714b3b57646SRob Herring uport = uart_port_check(state); 1715b3b57646SRob Herring if (!uport || uport->flags & UPF_DEAD) 1716b3b57646SRob Herring return -ENXIO; 1717b3b57646SRob Herring 17184047b371SPeter Hurley port->low_latency = (uport->flags & UPF_LOW_LATENCY) ? 1 : 0; 1719ab4382d2SGreg Kroah-Hartman 1720ab4382d2SGreg Kroah-Hartman /* 1721ab4382d2SGreg Kroah-Hartman * Start up the serial port. 1722ab4382d2SGreg Kroah-Hartman */ 1723b3b57646SRob Herring return uart_startup(tty, state, 0); 1724ab4382d2SGreg Kroah-Hartman } 1725ab4382d2SGreg Kroah-Hartman 1726ab4382d2SGreg Kroah-Hartman static const char *uart_type(struct uart_port *port) 1727ab4382d2SGreg Kroah-Hartman { 1728ab4382d2SGreg Kroah-Hartman const char *str = NULL; 1729ab4382d2SGreg Kroah-Hartman 1730ab4382d2SGreg Kroah-Hartman if (port->ops->type) 1731ab4382d2SGreg Kroah-Hartman str = port->ops->type(port); 1732ab4382d2SGreg Kroah-Hartman 1733ab4382d2SGreg Kroah-Hartman if (!str) 1734ab4382d2SGreg Kroah-Hartman str = "unknown"; 1735ab4382d2SGreg Kroah-Hartman 1736ab4382d2SGreg Kroah-Hartman return str; 1737ab4382d2SGreg Kroah-Hartman } 1738ab4382d2SGreg Kroah-Hartman 1739ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_PROC_FS 1740ab4382d2SGreg Kroah-Hartman 1741ab4382d2SGreg Kroah-Hartman static void uart_line_info(struct seq_file *m, struct uart_driver *drv, int i) 1742ab4382d2SGreg Kroah-Hartman { 1743ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + i; 1744ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 17456f538fe3SLinus Walleij enum uart_pm_state pm_state; 17464047b371SPeter Hurley struct uart_port *uport; 1747ab4382d2SGreg Kroah-Hartman char stat_buf[32]; 1748ab4382d2SGreg Kroah-Hartman unsigned int status; 1749ab4382d2SGreg Kroah-Hartman int mmio; 1750ab4382d2SGreg Kroah-Hartman 17514047b371SPeter Hurley mutex_lock(&port->mutex); 17524047b371SPeter Hurley uport = uart_port_check(state); 1753ab4382d2SGreg Kroah-Hartman if (!uport) 17544047b371SPeter Hurley goto out; 1755ab4382d2SGreg Kroah-Hartman 1756ab4382d2SGreg Kroah-Hartman mmio = uport->iotype >= UPIO_MEM; 1757ab4382d2SGreg Kroah-Hartman seq_printf(m, "%d: uart:%s %s%08llX irq:%d", 1758ab4382d2SGreg Kroah-Hartman uport->line, uart_type(uport), 1759ab4382d2SGreg Kroah-Hartman mmio ? "mmio:0x" : "port:", 1760ab4382d2SGreg Kroah-Hartman mmio ? (unsigned long long)uport->mapbase 1761ab4382d2SGreg Kroah-Hartman : (unsigned long long)uport->iobase, 1762ab4382d2SGreg Kroah-Hartman uport->irq); 1763ab4382d2SGreg Kroah-Hartman 1764ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) { 1765ab4382d2SGreg Kroah-Hartman seq_putc(m, '\n'); 17664047b371SPeter Hurley goto out; 1767ab4382d2SGreg Kroah-Hartman } 1768ab4382d2SGreg Kroah-Hartman 1769ab4382d2SGreg Kroah-Hartman if (capable(CAP_SYS_ADMIN)) { 1770ab4382d2SGreg Kroah-Hartman pm_state = state->pm_state; 17716f538fe3SLinus Walleij if (pm_state != UART_PM_STATE_ON) 17726f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 1773ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1774ab4382d2SGreg Kroah-Hartman status = uport->ops->get_mctrl(uport); 1775ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 17766f538fe3SLinus Walleij if (pm_state != UART_PM_STATE_ON) 1777ab4382d2SGreg Kroah-Hartman uart_change_pm(state, pm_state); 1778ab4382d2SGreg Kroah-Hartman 1779ab4382d2SGreg Kroah-Hartman seq_printf(m, " tx:%d rx:%d", 1780ab4382d2SGreg Kroah-Hartman uport->icount.tx, uport->icount.rx); 1781ab4382d2SGreg Kroah-Hartman if (uport->icount.frame) 1782968af298SPeter Hurley seq_printf(m, " fe:%d", uport->icount.frame); 1783ab4382d2SGreg Kroah-Hartman if (uport->icount.parity) 1784968af298SPeter Hurley seq_printf(m, " pe:%d", uport->icount.parity); 1785ab4382d2SGreg Kroah-Hartman if (uport->icount.brk) 1786968af298SPeter Hurley seq_printf(m, " brk:%d", uport->icount.brk); 1787ab4382d2SGreg Kroah-Hartman if (uport->icount.overrun) 1788968af298SPeter Hurley seq_printf(m, " oe:%d", uport->icount.overrun); 1789ab4382d2SGreg Kroah-Hartman 1790ab4382d2SGreg Kroah-Hartman #define INFOBIT(bit, str) \ 1791ab4382d2SGreg Kroah-Hartman if (uport->mctrl & (bit)) \ 1792ab4382d2SGreg Kroah-Hartman strncat(stat_buf, (str), sizeof(stat_buf) - \ 1793ab4382d2SGreg Kroah-Hartman strlen(stat_buf) - 2) 1794ab4382d2SGreg Kroah-Hartman #define STATBIT(bit, str) \ 1795ab4382d2SGreg Kroah-Hartman if (status & (bit)) \ 1796ab4382d2SGreg Kroah-Hartman strncat(stat_buf, (str), sizeof(stat_buf) - \ 1797ab4382d2SGreg Kroah-Hartman strlen(stat_buf) - 2) 1798ab4382d2SGreg Kroah-Hartman 1799ab4382d2SGreg Kroah-Hartman stat_buf[0] = '\0'; 1800ab4382d2SGreg Kroah-Hartman stat_buf[1] = '\0'; 1801ab4382d2SGreg Kroah-Hartman INFOBIT(TIOCM_RTS, "|RTS"); 1802ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_CTS, "|CTS"); 1803ab4382d2SGreg Kroah-Hartman INFOBIT(TIOCM_DTR, "|DTR"); 1804ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_DSR, "|DSR"); 1805ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_CAR, "|CD"); 1806ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_RNG, "|RI"); 1807ab4382d2SGreg Kroah-Hartman if (stat_buf[0]) 1808ab4382d2SGreg Kroah-Hartman stat_buf[0] = ' '; 1809ab4382d2SGreg Kroah-Hartman 1810ab4382d2SGreg Kroah-Hartman seq_puts(m, stat_buf); 1811ab4382d2SGreg Kroah-Hartman } 1812ab4382d2SGreg Kroah-Hartman seq_putc(m, '\n'); 1813ab4382d2SGreg Kroah-Hartman #undef STATBIT 1814ab4382d2SGreg Kroah-Hartman #undef INFOBIT 18154047b371SPeter Hurley out: 18164047b371SPeter Hurley mutex_unlock(&port->mutex); 1817ab4382d2SGreg Kroah-Hartman } 1818ab4382d2SGreg Kroah-Hartman 1819ab4382d2SGreg Kroah-Hartman static int uart_proc_show(struct seq_file *m, void *v) 1820ab4382d2SGreg Kroah-Hartman { 1821ab4382d2SGreg Kroah-Hartman struct tty_driver *ttydrv = m->private; 1822ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = ttydrv->driver_state; 1823ab4382d2SGreg Kroah-Hartman int i; 1824ab4382d2SGreg Kroah-Hartman 1825968af298SPeter Hurley seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n", "", "", ""); 1826ab4382d2SGreg Kroah-Hartman for (i = 0; i < drv->nr; i++) 1827ab4382d2SGreg Kroah-Hartman uart_line_info(m, drv, i); 1828ab4382d2SGreg Kroah-Hartman return 0; 1829ab4382d2SGreg Kroah-Hartman } 1830ab4382d2SGreg Kroah-Hartman 1831ab4382d2SGreg Kroah-Hartman static int uart_proc_open(struct inode *inode, struct file *file) 1832ab4382d2SGreg Kroah-Hartman { 1833d9dda78bSAl Viro return single_open(file, uart_proc_show, PDE_DATA(inode)); 1834ab4382d2SGreg Kroah-Hartman } 1835ab4382d2SGreg Kroah-Hartman 1836ab4382d2SGreg Kroah-Hartman static const struct file_operations uart_proc_fops = { 1837ab4382d2SGreg Kroah-Hartman .owner = THIS_MODULE, 1838ab4382d2SGreg Kroah-Hartman .open = uart_proc_open, 1839ab4382d2SGreg Kroah-Hartman .read = seq_read, 1840ab4382d2SGreg Kroah-Hartman .llseek = seq_lseek, 1841ab4382d2SGreg Kroah-Hartman .release = single_release, 1842ab4382d2SGreg Kroah-Hartman }; 1843ab4382d2SGreg Kroah-Hartman #endif 1844ab4382d2SGreg Kroah-Hartman 1845ab4382d2SGreg Kroah-Hartman #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL) 18461cfe42b7SPeter Hurley /** 1847ab4382d2SGreg Kroah-Hartman * uart_console_write - write a console message to a serial port 1848ab4382d2SGreg Kroah-Hartman * @port: the port to write the message 1849ab4382d2SGreg Kroah-Hartman * @s: array of characters 1850ab4382d2SGreg Kroah-Hartman * @count: number of characters in string to write 185110afbe34SPeter Hurley * @putchar: function to write character to port 1852ab4382d2SGreg Kroah-Hartman */ 1853ab4382d2SGreg Kroah-Hartman void uart_console_write(struct uart_port *port, const char *s, 1854ab4382d2SGreg Kroah-Hartman unsigned int count, 1855ab4382d2SGreg Kroah-Hartman void (*putchar)(struct uart_port *, int)) 1856ab4382d2SGreg Kroah-Hartman { 1857ab4382d2SGreg Kroah-Hartman unsigned int i; 1858ab4382d2SGreg Kroah-Hartman 1859ab4382d2SGreg Kroah-Hartman for (i = 0; i < count; i++, s++) { 1860ab4382d2SGreg Kroah-Hartman if (*s == '\n') 1861ab4382d2SGreg Kroah-Hartman putchar(port, '\r'); 1862ab4382d2SGreg Kroah-Hartman putchar(port, *s); 1863ab4382d2SGreg Kroah-Hartman } 1864ab4382d2SGreg Kroah-Hartman } 1865ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_console_write); 1866ab4382d2SGreg Kroah-Hartman 1867ab4382d2SGreg Kroah-Hartman /* 1868ab4382d2SGreg Kroah-Hartman * Check whether an invalid uart number has been specified, and 1869ab4382d2SGreg Kroah-Hartman * if so, search for the first available port that does have 1870ab4382d2SGreg Kroah-Hartman * console support. 1871ab4382d2SGreg Kroah-Hartman */ 1872ab4382d2SGreg Kroah-Hartman struct uart_port * __init 1873ab4382d2SGreg Kroah-Hartman uart_get_console(struct uart_port *ports, int nr, struct console *co) 1874ab4382d2SGreg Kroah-Hartman { 1875ab4382d2SGreg Kroah-Hartman int idx = co->index; 1876ab4382d2SGreg Kroah-Hartman 1877ab4382d2SGreg Kroah-Hartman if (idx < 0 || idx >= nr || (ports[idx].iobase == 0 && 1878ab4382d2SGreg Kroah-Hartman ports[idx].membase == NULL)) 1879ab4382d2SGreg Kroah-Hartman for (idx = 0; idx < nr; idx++) 1880ab4382d2SGreg Kroah-Hartman if (ports[idx].iobase != 0 || 1881ab4382d2SGreg Kroah-Hartman ports[idx].membase != NULL) 1882ab4382d2SGreg Kroah-Hartman break; 1883ab4382d2SGreg Kroah-Hartman 1884ab4382d2SGreg Kroah-Hartman co->index = idx; 1885ab4382d2SGreg Kroah-Hartman 1886ab4382d2SGreg Kroah-Hartman return ports + idx; 1887ab4382d2SGreg Kroah-Hartman } 1888ab4382d2SGreg Kroah-Hartman 1889ab4382d2SGreg Kroah-Hartman /** 189073abaf87SPeter Hurley * uart_parse_earlycon - Parse earlycon options 189173abaf87SPeter Hurley * @p: ptr to 2nd field (ie., just beyond '<name>,') 189273abaf87SPeter Hurley * @iotype: ptr for decoded iotype (out) 189373abaf87SPeter Hurley * @addr: ptr for decoded mapbase/iobase (out) 189473abaf87SPeter Hurley * @options: ptr for <options> field; NULL if not present (out) 189573abaf87SPeter Hurley * 189673abaf87SPeter Hurley * Decodes earlycon kernel command line parameters of the form 1897bd94c407SMasahiro Yamada * earlycon=<name>,io|mmio|mmio16|mmio32|mmio32be|mmio32native,<addr>,<options> 1898bd94c407SMasahiro Yamada * console=<name>,io|mmio|mmio16|mmio32|mmio32be|mmio32native,<addr>,<options> 189973abaf87SPeter Hurley * 190073abaf87SPeter Hurley * The optional form 190173abaf87SPeter Hurley * earlycon=<name>,0x<addr>,<options> 190273abaf87SPeter Hurley * console=<name>,0x<addr>,<options> 190373abaf87SPeter Hurley * is also accepted; the returned @iotype will be UPIO_MEM. 190473abaf87SPeter Hurley * 19058b2303deSAlexander Sverdlin * Returns 0 on success or -EINVAL on failure 190673abaf87SPeter Hurley */ 190746e36683SAlexander Sverdlin int uart_parse_earlycon(char *p, unsigned char *iotype, resource_size_t *addr, 190873abaf87SPeter Hurley char **options) 190973abaf87SPeter Hurley { 191073abaf87SPeter Hurley if (strncmp(p, "mmio,", 5) == 0) { 191173abaf87SPeter Hurley *iotype = UPIO_MEM; 191273abaf87SPeter Hurley p += 5; 1913bd94c407SMasahiro Yamada } else if (strncmp(p, "mmio16,", 7) == 0) { 1914bd94c407SMasahiro Yamada *iotype = UPIO_MEM16; 1915bd94c407SMasahiro Yamada p += 7; 191673abaf87SPeter Hurley } else if (strncmp(p, "mmio32,", 7) == 0) { 191773abaf87SPeter Hurley *iotype = UPIO_MEM32; 191873abaf87SPeter Hurley p += 7; 19196e63be3fSNoam Camus } else if (strncmp(p, "mmio32be,", 9) == 0) { 19206e63be3fSNoam Camus *iotype = UPIO_MEM32BE; 19216e63be3fSNoam Camus p += 9; 1922d215d809SMax Filippov } else if (strncmp(p, "mmio32native,", 13) == 0) { 1923d215d809SMax Filippov *iotype = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) ? 1924d215d809SMax Filippov UPIO_MEM32BE : UPIO_MEM32; 1925d215d809SMax Filippov p += 13; 192673abaf87SPeter Hurley } else if (strncmp(p, "io,", 3) == 0) { 192773abaf87SPeter Hurley *iotype = UPIO_PORT; 192873abaf87SPeter Hurley p += 3; 192973abaf87SPeter Hurley } else if (strncmp(p, "0x", 2) == 0) { 193073abaf87SPeter Hurley *iotype = UPIO_MEM; 193173abaf87SPeter Hurley } else { 193273abaf87SPeter Hurley return -EINVAL; 193373abaf87SPeter Hurley } 193473abaf87SPeter Hurley 19358b2303deSAlexander Sverdlin /* 19368b2303deSAlexander Sverdlin * Before you replace it with kstrtoull(), think about options separator 19378b2303deSAlexander Sverdlin * (',') it will not tolerate 19388b2303deSAlexander Sverdlin */ 19398b2303deSAlexander Sverdlin *addr = simple_strtoull(p, NULL, 0); 194073abaf87SPeter Hurley p = strchr(p, ','); 194173abaf87SPeter Hurley if (p) 194273abaf87SPeter Hurley p++; 194373abaf87SPeter Hurley 194473abaf87SPeter Hurley *options = p; 194573abaf87SPeter Hurley return 0; 194673abaf87SPeter Hurley } 194773abaf87SPeter Hurley EXPORT_SYMBOL_GPL(uart_parse_earlycon); 194873abaf87SPeter Hurley 194973abaf87SPeter Hurley /** 195002088ca6SGeert Uytterhoeven * uart_parse_options - Parse serial port baud/parity/bits/flow control. 1951ab4382d2SGreg Kroah-Hartman * @options: pointer to option string 1952ab4382d2SGreg Kroah-Hartman * @baud: pointer to an 'int' variable for the baud rate. 1953ab4382d2SGreg Kroah-Hartman * @parity: pointer to an 'int' variable for the parity. 1954ab4382d2SGreg Kroah-Hartman * @bits: pointer to an 'int' variable for the number of data bits. 1955ab4382d2SGreg Kroah-Hartman * @flow: pointer to an 'int' variable for the flow control character. 1956ab4382d2SGreg Kroah-Hartman * 1957ab4382d2SGreg Kroah-Hartman * uart_parse_options decodes a string containing the serial console 1958ab4382d2SGreg Kroah-Hartman * options. The format of the string is <baud><parity><bits><flow>, 1959ab4382d2SGreg Kroah-Hartman * eg: 115200n8r 1960ab4382d2SGreg Kroah-Hartman */ 1961ab4382d2SGreg Kroah-Hartman void 19620f646b63SPaul Cercueil uart_parse_options(const char *options, int *baud, int *parity, 19630f646b63SPaul Cercueil int *bits, int *flow) 1964ab4382d2SGreg Kroah-Hartman { 19650f646b63SPaul Cercueil const char *s = options; 1966ab4382d2SGreg Kroah-Hartman 1967ab4382d2SGreg Kroah-Hartman *baud = simple_strtoul(s, NULL, 10); 1968ab4382d2SGreg Kroah-Hartman while (*s >= '0' && *s <= '9') 1969ab4382d2SGreg Kroah-Hartman s++; 1970ab4382d2SGreg Kroah-Hartman if (*s) 1971ab4382d2SGreg Kroah-Hartman *parity = *s++; 1972ab4382d2SGreg Kroah-Hartman if (*s) 1973ab4382d2SGreg Kroah-Hartman *bits = *s++ - '0'; 1974ab4382d2SGreg Kroah-Hartman if (*s) 1975ab4382d2SGreg Kroah-Hartman *flow = *s; 1976ab4382d2SGreg Kroah-Hartman } 1977ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_parse_options); 1978ab4382d2SGreg Kroah-Hartman 1979ab4382d2SGreg Kroah-Hartman /** 1980ab4382d2SGreg Kroah-Hartman * uart_set_options - setup the serial console parameters 1981ab4382d2SGreg Kroah-Hartman * @port: pointer to the serial ports uart_port structure 1982ab4382d2SGreg Kroah-Hartman * @co: console pointer 1983ab4382d2SGreg Kroah-Hartman * @baud: baud rate 1984ab4382d2SGreg Kroah-Hartman * @parity: parity character - 'n' (none), 'o' (odd), 'e' (even) 1985ab4382d2SGreg Kroah-Hartman * @bits: number of data bits 1986ab4382d2SGreg Kroah-Hartman * @flow: flow control character - 'r' (rts) 1987ab4382d2SGreg Kroah-Hartman */ 1988ab4382d2SGreg Kroah-Hartman int 1989ab4382d2SGreg Kroah-Hartman uart_set_options(struct uart_port *port, struct console *co, 1990ab4382d2SGreg Kroah-Hartman int baud, int parity, int bits, int flow) 1991ab4382d2SGreg Kroah-Hartman { 1992ab4382d2SGreg Kroah-Hartman struct ktermios termios; 1993ab4382d2SGreg Kroah-Hartman static struct ktermios dummy; 1994ab4382d2SGreg Kroah-Hartman 1995ab4382d2SGreg Kroah-Hartman /* 1996ab4382d2SGreg Kroah-Hartman * Ensure that the serial console lock is initialised 1997ab4382d2SGreg Kroah-Hartman * early. 199842b6a1baSRandy Witt * If this port is a console, then the spinlock is already 199942b6a1baSRandy Witt * initialised. 2000ab4382d2SGreg Kroah-Hartman */ 200142b6a1baSRandy Witt if (!(uart_console(port) && (port->cons->flags & CON_ENABLED))) { 2002ab4382d2SGreg Kroah-Hartman spin_lock_init(&port->lock); 2003ab4382d2SGreg Kroah-Hartman lockdep_set_class(&port->lock, &port_lock_key); 200442b6a1baSRandy Witt } 2005ab4382d2SGreg Kroah-Hartman 2006ab4382d2SGreg Kroah-Hartman memset(&termios, 0, sizeof(struct ktermios)); 2007ab4382d2SGreg Kroah-Hartman 2008ba47f97aSJeffy Chen termios.c_cflag |= CREAD | HUPCL | CLOCAL; 2009ba47f97aSJeffy Chen tty_termios_encode_baud_rate(&termios, baud, baud); 2010ab4382d2SGreg Kroah-Hartman 2011ab4382d2SGreg Kroah-Hartman if (bits == 7) 2012ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CS7; 2013ab4382d2SGreg Kroah-Hartman else 2014ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CS8; 2015ab4382d2SGreg Kroah-Hartman 2016ab4382d2SGreg Kroah-Hartman switch (parity) { 2017ab4382d2SGreg Kroah-Hartman case 'o': case 'O': 2018ab4382d2SGreg Kroah-Hartman termios.c_cflag |= PARODD; 2019ab4382d2SGreg Kroah-Hartman /*fall through*/ 2020ab4382d2SGreg Kroah-Hartman case 'e': case 'E': 2021ab4382d2SGreg Kroah-Hartman termios.c_cflag |= PARENB; 2022ab4382d2SGreg Kroah-Hartman break; 2023ab4382d2SGreg Kroah-Hartman } 2024ab4382d2SGreg Kroah-Hartman 2025ab4382d2SGreg Kroah-Hartman if (flow == 'r') 2026ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CRTSCTS; 2027ab4382d2SGreg Kroah-Hartman 2028ab4382d2SGreg Kroah-Hartman /* 2029ab4382d2SGreg Kroah-Hartman * some uarts on other side don't support no flow control. 2030ab4382d2SGreg Kroah-Hartman * So we set * DTR in host uart to make them happy 2031ab4382d2SGreg Kroah-Hartman */ 2032ab4382d2SGreg Kroah-Hartman port->mctrl |= TIOCM_DTR; 2033ab4382d2SGreg Kroah-Hartman 2034ab4382d2SGreg Kroah-Hartman port->ops->set_termios(port, &termios, &dummy); 2035ab4382d2SGreg Kroah-Hartman /* 2036ab4382d2SGreg Kroah-Hartman * Allow the setting of the UART parameters with a NULL console 2037ab4382d2SGreg Kroah-Hartman * too: 2038ab4382d2SGreg Kroah-Hartman */ 2039ab4382d2SGreg Kroah-Hartman if (co) 2040ab4382d2SGreg Kroah-Hartman co->cflag = termios.c_cflag; 2041ab4382d2SGreg Kroah-Hartman 2042ab4382d2SGreg Kroah-Hartman return 0; 2043ab4382d2SGreg Kroah-Hartman } 2044ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_set_options); 2045ab4382d2SGreg Kroah-Hartman #endif /* CONFIG_SERIAL_CORE_CONSOLE */ 2046ab4382d2SGreg Kroah-Hartman 2047cf75525fSJiri Slaby /** 2048cf75525fSJiri Slaby * uart_change_pm - set power state of the port 2049cf75525fSJiri Slaby * 2050cf75525fSJiri Slaby * @state: port descriptor 2051cf75525fSJiri Slaby * @pm_state: new state 2052cf75525fSJiri Slaby * 2053cf75525fSJiri Slaby * Locking: port->mutex has to be held 2054cf75525fSJiri Slaby */ 20556f538fe3SLinus Walleij static void uart_change_pm(struct uart_state *state, 20566f538fe3SLinus Walleij enum uart_pm_state pm_state) 2057ab4382d2SGreg Kroah-Hartman { 20584047b371SPeter Hurley struct uart_port *port = uart_port_check(state); 2059ab4382d2SGreg Kroah-Hartman 2060ab4382d2SGreg Kroah-Hartman if (state->pm_state != pm_state) { 20614047b371SPeter Hurley if (port && port->ops->pm) 2062ab4382d2SGreg Kroah-Hartman port->ops->pm(port, pm_state, state->pm_state); 2063ab4382d2SGreg Kroah-Hartman state->pm_state = pm_state; 2064ab4382d2SGreg Kroah-Hartman } 2065ab4382d2SGreg Kroah-Hartman } 2066ab4382d2SGreg Kroah-Hartman 2067ab4382d2SGreg Kroah-Hartman struct uart_match { 2068ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2069ab4382d2SGreg Kroah-Hartman struct uart_driver *driver; 2070ab4382d2SGreg Kroah-Hartman }; 2071ab4382d2SGreg Kroah-Hartman 2072ab4382d2SGreg Kroah-Hartman static int serial_match_port(struct device *dev, void *data) 2073ab4382d2SGreg Kroah-Hartman { 2074ab4382d2SGreg Kroah-Hartman struct uart_match *match = data; 2075ab4382d2SGreg Kroah-Hartman struct tty_driver *tty_drv = match->driver->tty_driver; 2076ab4382d2SGreg Kroah-Hartman dev_t devt = MKDEV(tty_drv->major, tty_drv->minor_start) + 2077ab4382d2SGreg Kroah-Hartman match->port->line; 2078ab4382d2SGreg Kroah-Hartman 2079ab4382d2SGreg Kroah-Hartman return dev->devt == devt; /* Actually, only one tty per port */ 2080ab4382d2SGreg Kroah-Hartman } 2081ab4382d2SGreg Kroah-Hartman 2082ab4382d2SGreg Kroah-Hartman int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport) 2083ab4382d2SGreg Kroah-Hartman { 2084ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 2085ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2086ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 2087ab4382d2SGreg Kroah-Hartman struct uart_match match = {uport, drv}; 2088ab4382d2SGreg Kroah-Hartman 2089ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2090ab4382d2SGreg Kroah-Hartman 2091ab4382d2SGreg Kroah-Hartman tty_dev = device_find_child(uport->dev, &match, serial_match_port); 209288e2582eSLucas Stach if (tty_dev && device_may_wakeup(tty_dev)) { 2093aef3ad10SAndy Shevchenko enable_irq_wake(uport->irq); 2094ab4382d2SGreg Kroah-Hartman put_device(tty_dev); 2095ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2096ab4382d2SGreg Kroah-Hartman return 0; 2097ab4382d2SGreg Kroah-Hartman } 20985a65dcc0SFederico Vaga put_device(tty_dev); 20995a65dcc0SFederico Vaga 2100b164c972SPeter Hurley /* Nothing to do if the console is not suspending */ 2101b164c972SPeter Hurley if (!console_suspend_enabled && uart_console(uport)) 2102b164c972SPeter Hurley goto unlock; 2103b164c972SPeter Hurley 2104ab4382d2SGreg Kroah-Hartman uport->suspended = 1; 2105ab4382d2SGreg Kroah-Hartman 2106d41861caSPeter Hurley if (tty_port_initialized(port)) { 2107ab4382d2SGreg Kroah-Hartman const struct uart_ops *ops = uport->ops; 2108ab4382d2SGreg Kroah-Hartman int tries; 2109ab4382d2SGreg Kroah-Hartman 211080f02d54SPeter Hurley tty_port_set_suspended(port, 1); 2111d41861caSPeter Hurley tty_port_set_initialized(port, 0); 2112ab4382d2SGreg Kroah-Hartman 2113ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 2114ab4382d2SGreg Kroah-Hartman ops->stop_tx(uport); 2115ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, 0); 2116ab4382d2SGreg Kroah-Hartman ops->stop_rx(uport); 2117ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2118ab4382d2SGreg Kroah-Hartman 2119ab4382d2SGreg Kroah-Hartman /* 2120ab4382d2SGreg Kroah-Hartman * Wait for the transmitter to empty. 2121ab4382d2SGreg Kroah-Hartman */ 2122ab4382d2SGreg Kroah-Hartman for (tries = 3; !ops->tx_empty(uport) && tries; tries--) 2123ab4382d2SGreg Kroah-Hartman msleep(10); 2124ab4382d2SGreg Kroah-Hartman if (!tries) 2125cade3580SAndy Shevchenko dev_err(uport->dev, "%s: Unable to drain transmitter\n", 2126cade3580SAndy Shevchenko uport->name); 2127ab4382d2SGreg Kroah-Hartman 2128ab4382d2SGreg Kroah-Hartman ops->shutdown(uport); 2129ab4382d2SGreg Kroah-Hartman } 2130ab4382d2SGreg Kroah-Hartman 2131ab4382d2SGreg Kroah-Hartman /* 2132ab4382d2SGreg Kroah-Hartman * Disable the console device before suspending. 2133ab4382d2SGreg Kroah-Hartman */ 2134b164c972SPeter Hurley if (uart_console(uport)) 2135ab4382d2SGreg Kroah-Hartman console_stop(uport->cons); 2136ab4382d2SGreg Kroah-Hartman 21376f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_OFF); 2138b164c972SPeter Hurley unlock: 2139ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2140ab4382d2SGreg Kroah-Hartman 2141ab4382d2SGreg Kroah-Hartman return 0; 2142ab4382d2SGreg Kroah-Hartman } 2143ab4382d2SGreg Kroah-Hartman 2144ab4382d2SGreg Kroah-Hartman int uart_resume_port(struct uart_driver *drv, struct uart_port *uport) 2145ab4382d2SGreg Kroah-Hartman { 2146ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 2147ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2148ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 2149ab4382d2SGreg Kroah-Hartman struct uart_match match = {uport, drv}; 2150ab4382d2SGreg Kroah-Hartman struct ktermios termios; 2151ab4382d2SGreg Kroah-Hartman 2152ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2153ab4382d2SGreg Kroah-Hartman 2154ab4382d2SGreg Kroah-Hartman tty_dev = device_find_child(uport->dev, &match, serial_match_port); 2155ab4382d2SGreg Kroah-Hartman if (!uport->suspended && device_may_wakeup(tty_dev)) { 2156aef3ad10SAndy Shevchenko if (irqd_is_wakeup_set(irq_get_irq_data((uport->irq)))) 2157ab4382d2SGreg Kroah-Hartman disable_irq_wake(uport->irq); 21585a65dcc0SFederico Vaga put_device(tty_dev); 2159ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2160ab4382d2SGreg Kroah-Hartman return 0; 2161ab4382d2SGreg Kroah-Hartman } 21625a65dcc0SFederico Vaga put_device(tty_dev); 2163ab4382d2SGreg Kroah-Hartman uport->suspended = 0; 2164ab4382d2SGreg Kroah-Hartman 2165ab4382d2SGreg Kroah-Hartman /* 2166ab4382d2SGreg Kroah-Hartman * Re-enable the console device after suspending. 2167ab4382d2SGreg Kroah-Hartman */ 21685933a161SYin Kangkai if (uart_console(uport)) { 2169ab4382d2SGreg Kroah-Hartman /* 2170ab4382d2SGreg Kroah-Hartman * First try to use the console cflag setting. 2171ab4382d2SGreg Kroah-Hartman */ 2172ab4382d2SGreg Kroah-Hartman memset(&termios, 0, sizeof(struct ktermios)); 2173ab4382d2SGreg Kroah-Hartman termios.c_cflag = uport->cons->cflag; 2174ab4382d2SGreg Kroah-Hartman 2175ab4382d2SGreg Kroah-Hartman /* 2176ab4382d2SGreg Kroah-Hartman * If that's unset, use the tty termios setting. 2177ab4382d2SGreg Kroah-Hartman */ 2178adc8d746SAlan Cox if (port->tty && termios.c_cflag == 0) 2179adc8d746SAlan Cox termios = port->tty->termios; 2180ab4382d2SGreg Kroah-Hartman 218194abc56fSNing Jiang if (console_suspend_enabled) 21826f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2183ab4382d2SGreg Kroah-Hartman uport->ops->set_termios(uport, &termios, NULL); 21845933a161SYin Kangkai if (console_suspend_enabled) 2185ab4382d2SGreg Kroah-Hartman console_start(uport->cons); 2186ab4382d2SGreg Kroah-Hartman } 2187ab4382d2SGreg Kroah-Hartman 218880f02d54SPeter Hurley if (tty_port_suspended(port)) { 2189ab4382d2SGreg Kroah-Hartman const struct uart_ops *ops = uport->ops; 2190ab4382d2SGreg Kroah-Hartman int ret; 2191ab4382d2SGreg Kroah-Hartman 21926f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2193ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 2194ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, 0); 2195ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2196ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) { 2197ab4382d2SGreg Kroah-Hartman /* Protected by port mutex for now */ 2198ab4382d2SGreg Kroah-Hartman struct tty_struct *tty = port->tty; 2199ab4382d2SGreg Kroah-Hartman ret = ops->startup(uport); 2200ab4382d2SGreg Kroah-Hartman if (ret == 0) { 2201ab4382d2SGreg Kroah-Hartman if (tty) 2202ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 2203ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 2204ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, uport->mctrl); 2205ab4382d2SGreg Kroah-Hartman ops->start_tx(uport); 2206ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2207d41861caSPeter Hurley tty_port_set_initialized(port, 1); 2208ab4382d2SGreg Kroah-Hartman } else { 2209ab4382d2SGreg Kroah-Hartman /* 2210ab4382d2SGreg Kroah-Hartman * Failed to resume - maybe hardware went away? 2211ab4382d2SGreg Kroah-Hartman * Clear the "initialized" flag so we won't try 2212ab4382d2SGreg Kroah-Hartman * to call the low level drivers shutdown method. 2213ab4382d2SGreg Kroah-Hartman */ 2214ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 2215ab4382d2SGreg Kroah-Hartman } 2216ab4382d2SGreg Kroah-Hartman } 2217ab4382d2SGreg Kroah-Hartman 221880f02d54SPeter Hurley tty_port_set_suspended(port, 0); 2219ab4382d2SGreg Kroah-Hartman } 2220ab4382d2SGreg Kroah-Hartman 2221ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2222ab4382d2SGreg Kroah-Hartman 2223ab4382d2SGreg Kroah-Hartman return 0; 2224ab4382d2SGreg Kroah-Hartman } 2225ab4382d2SGreg Kroah-Hartman 2226ab4382d2SGreg Kroah-Hartman static inline void 2227ab4382d2SGreg Kroah-Hartman uart_report_port(struct uart_driver *drv, struct uart_port *port) 2228ab4382d2SGreg Kroah-Hartman { 2229ab4382d2SGreg Kroah-Hartman char address[64]; 2230ab4382d2SGreg Kroah-Hartman 2231ab4382d2SGreg Kroah-Hartman switch (port->iotype) { 2232ab4382d2SGreg Kroah-Hartman case UPIO_PORT: 2233ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), "I/O 0x%lx", port->iobase); 2234ab4382d2SGreg Kroah-Hartman break; 2235ab4382d2SGreg Kroah-Hartman case UPIO_HUB6: 2236ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), 2237ab4382d2SGreg Kroah-Hartman "I/O 0x%lx offset 0x%x", port->iobase, port->hub6); 2238ab4382d2SGreg Kroah-Hartman break; 2239ab4382d2SGreg Kroah-Hartman case UPIO_MEM: 2240bd94c407SMasahiro Yamada case UPIO_MEM16: 2241ab4382d2SGreg Kroah-Hartman case UPIO_MEM32: 22423ffb1a81SKevin Cernekee case UPIO_MEM32BE: 2243ab4382d2SGreg Kroah-Hartman case UPIO_AU: 2244ab4382d2SGreg Kroah-Hartman case UPIO_TSI: 2245ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), 2246ab4382d2SGreg Kroah-Hartman "MMIO 0x%llx", (unsigned long long)port->mapbase); 2247ab4382d2SGreg Kroah-Hartman break; 2248ab4382d2SGreg Kroah-Hartman default: 2249ab4382d2SGreg Kroah-Hartman strlcpy(address, "*unknown*", sizeof(address)); 2250ab4382d2SGreg Kroah-Hartman break; 2251ab4382d2SGreg Kroah-Hartman } 2252ab4382d2SGreg Kroah-Hartman 2253cade3580SAndy Shevchenko pr_info("%s%s%s at %s (irq = %d, base_baud = %d) is a %s\n", 225468ed7e1cSJames Bottomley port->dev ? dev_name(port->dev) : "", 225568ed7e1cSJames Bottomley port->dev ? ": " : "", 2256cade3580SAndy Shevchenko port->name, 22577d12b976SKees Cook address, port->irq, port->uartclk / 16, uart_type(port)); 2258ab4382d2SGreg Kroah-Hartman } 2259ab4382d2SGreg Kroah-Hartman 2260ab4382d2SGreg Kroah-Hartman static void 2261ab4382d2SGreg Kroah-Hartman uart_configure_port(struct uart_driver *drv, struct uart_state *state, 2262ab4382d2SGreg Kroah-Hartman struct uart_port *port) 2263ab4382d2SGreg Kroah-Hartman { 2264ab4382d2SGreg Kroah-Hartman unsigned int flags; 2265ab4382d2SGreg Kroah-Hartman 2266ab4382d2SGreg Kroah-Hartman /* 2267ab4382d2SGreg Kroah-Hartman * If there isn't a port here, don't do anything further. 2268ab4382d2SGreg Kroah-Hartman */ 2269ab4382d2SGreg Kroah-Hartman if (!port->iobase && !port->mapbase && !port->membase) 2270ab4382d2SGreg Kroah-Hartman return; 2271ab4382d2SGreg Kroah-Hartman 2272ab4382d2SGreg Kroah-Hartman /* 2273ab4382d2SGreg Kroah-Hartman * Now do the auto configuration stuff. Note that config_port 2274ab4382d2SGreg Kroah-Hartman * is expected to claim the resources and map the port for us. 2275ab4382d2SGreg Kroah-Hartman */ 2276ab4382d2SGreg Kroah-Hartman flags = 0; 2277ab4382d2SGreg Kroah-Hartman if (port->flags & UPF_AUTO_IRQ) 2278ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_IRQ; 2279ab4382d2SGreg Kroah-Hartman if (port->flags & UPF_BOOT_AUTOCONF) { 2280ab4382d2SGreg Kroah-Hartman if (!(port->flags & UPF_FIXED_TYPE)) { 2281ab4382d2SGreg Kroah-Hartman port->type = PORT_UNKNOWN; 2282ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_TYPE; 2283ab4382d2SGreg Kroah-Hartman } 2284ab4382d2SGreg Kroah-Hartman port->ops->config_port(port, flags); 2285ab4382d2SGreg Kroah-Hartman } 2286ab4382d2SGreg Kroah-Hartman 2287ab4382d2SGreg Kroah-Hartman if (port->type != PORT_UNKNOWN) { 2288ab4382d2SGreg Kroah-Hartman unsigned long flags; 2289ab4382d2SGreg Kroah-Hartman 2290ab4382d2SGreg Kroah-Hartman uart_report_port(drv, port); 2291ab4382d2SGreg Kroah-Hartman 2292ab4382d2SGreg Kroah-Hartman /* Power up port for set_mctrl() */ 22936f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2294ab4382d2SGreg Kroah-Hartman 2295ab4382d2SGreg Kroah-Hartman /* 2296ab4382d2SGreg Kroah-Hartman * Ensure that the modem control lines are de-activated. 2297ab4382d2SGreg Kroah-Hartman * keep the DTR setting that is set in uart_set_options() 2298ab4382d2SGreg Kroah-Hartman * We probably don't need a spinlock around this, but 2299ab4382d2SGreg Kroah-Hartman */ 2300ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 2301ab4382d2SGreg Kroah-Hartman port->ops->set_mctrl(port, port->mctrl & TIOCM_DTR); 2302ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 2303ab4382d2SGreg Kroah-Hartman 2304ab4382d2SGreg Kroah-Hartman /* 2305ab4382d2SGreg Kroah-Hartman * If this driver supports console, and it hasn't been 2306ab4382d2SGreg Kroah-Hartman * successfully registered yet, try to re-register it. 2307ab4382d2SGreg Kroah-Hartman * It may be that the port was not available. 2308ab4382d2SGreg Kroah-Hartman */ 2309ab4382d2SGreg Kroah-Hartman if (port->cons && !(port->cons->flags & CON_ENABLED)) 2310ab4382d2SGreg Kroah-Hartman register_console(port->cons); 2311ab4382d2SGreg Kroah-Hartman 2312ab4382d2SGreg Kroah-Hartman /* 2313ab4382d2SGreg Kroah-Hartman * Power down all ports by default, except the 2314ab4382d2SGreg Kroah-Hartman * console if we have one. 2315ab4382d2SGreg Kroah-Hartman */ 2316ab4382d2SGreg Kroah-Hartman if (!uart_console(port)) 23176f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_OFF); 2318ab4382d2SGreg Kroah-Hartman } 2319ab4382d2SGreg Kroah-Hartman } 2320ab4382d2SGreg Kroah-Hartman 2321ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 2322ab4382d2SGreg Kroah-Hartman 2323ab4382d2SGreg Kroah-Hartman static int uart_poll_init(struct tty_driver *driver, int line, char *options) 2324ab4382d2SGreg Kroah-Hartman { 2325ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2326ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 232749c02304SPeter Hurley struct tty_port *tport; 2328ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2329ab4382d2SGreg Kroah-Hartman int baud = 9600; 2330ab4382d2SGreg Kroah-Hartman int bits = 8; 2331ab4382d2SGreg Kroah-Hartman int parity = 'n'; 2332ab4382d2SGreg Kroah-Hartman int flow = 'n'; 233349c02304SPeter Hurley int ret = 0; 2334ab4382d2SGreg Kroah-Hartman 233549c02304SPeter Hurley tport = &state->port; 233649c02304SPeter Hurley mutex_lock(&tport->mutex); 233749c02304SPeter Hurley 23384047b371SPeter Hurley port = uart_port_check(state); 23394047b371SPeter Hurley if (!port || !(port->ops->poll_get_char && port->ops->poll_put_char)) { 234049c02304SPeter Hurley ret = -1; 234149c02304SPeter Hurley goto out; 234249c02304SPeter Hurley } 2343ab4382d2SGreg Kroah-Hartman 2344c7f3e708SAnton Vorontsov if (port->ops->poll_init) { 2345c7f3e708SAnton Vorontsov /* 2346d41861caSPeter Hurley * We don't set initialized as we only initialized the hw, 2347d41861caSPeter Hurley * e.g. state->xmit is still uninitialized. 2348c7f3e708SAnton Vorontsov */ 2349d41861caSPeter Hurley if (!tty_port_initialized(tport)) 2350c7f3e708SAnton Vorontsov ret = port->ops->poll_init(port); 2351c7f3e708SAnton Vorontsov } 2352c7f3e708SAnton Vorontsov 235349c02304SPeter Hurley if (!ret && options) { 2354ab4382d2SGreg Kroah-Hartman uart_parse_options(options, &baud, &parity, &bits, &flow); 235549c02304SPeter Hurley ret = uart_set_options(port, NULL, baud, parity, bits, flow); 2356ab4382d2SGreg Kroah-Hartman } 235749c02304SPeter Hurley out: 235849c02304SPeter Hurley mutex_unlock(&tport->mutex); 235949c02304SPeter Hurley return ret; 2360ab4382d2SGreg Kroah-Hartman } 2361ab4382d2SGreg Kroah-Hartman 2362ab4382d2SGreg Kroah-Hartman static int uart_poll_get_char(struct tty_driver *driver, int line) 2363ab4382d2SGreg Kroah-Hartman { 2364ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2365ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2366ab4382d2SGreg Kroah-Hartman struct uart_port *port; 23679ed19428SPeter Hurley int ret = -1; 2368ab4382d2SGreg Kroah-Hartman 23699ed19428SPeter Hurley port = uart_port_ref(state); 2370ef510beaSAndy Shevchenko if (port) { 23719ed19428SPeter Hurley ret = port->ops->poll_get_char(port); 23729ed19428SPeter Hurley uart_port_deref(port); 23739ed19428SPeter Hurley } 237422077b09SJiri Slaby 23759ed19428SPeter Hurley return ret; 2376ab4382d2SGreg Kroah-Hartman } 2377ab4382d2SGreg Kroah-Hartman 2378ab4382d2SGreg Kroah-Hartman static void uart_poll_put_char(struct tty_driver *driver, int line, char ch) 2379ab4382d2SGreg Kroah-Hartman { 2380ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2381ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2382ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2383ab4382d2SGreg Kroah-Hartman 23849ed19428SPeter Hurley port = uart_port_ref(state); 23859ed19428SPeter Hurley if (!port) 23869ed19428SPeter Hurley return; 2387c7d44a02SDoug Anderson 2388c7d44a02SDoug Anderson if (ch == '\n') 2389c7d44a02SDoug Anderson port->ops->poll_put_char(port, '\r'); 2390ab4382d2SGreg Kroah-Hartman port->ops->poll_put_char(port, ch); 23919ed19428SPeter Hurley uart_port_deref(port); 2392ab4382d2SGreg Kroah-Hartman } 2393ab4382d2SGreg Kroah-Hartman #endif 2394ab4382d2SGreg Kroah-Hartman 2395ab4382d2SGreg Kroah-Hartman static const struct tty_operations uart_ops = { 2396ab4382d2SGreg Kroah-Hartman .open = uart_open, 2397ab4382d2SGreg Kroah-Hartman .close = uart_close, 2398ab4382d2SGreg Kroah-Hartman .write = uart_write, 2399ab4382d2SGreg Kroah-Hartman .put_char = uart_put_char, 2400ab4382d2SGreg Kroah-Hartman .flush_chars = uart_flush_chars, 2401ab4382d2SGreg Kroah-Hartman .write_room = uart_write_room, 2402ab4382d2SGreg Kroah-Hartman .chars_in_buffer= uart_chars_in_buffer, 2403ab4382d2SGreg Kroah-Hartman .flush_buffer = uart_flush_buffer, 2404ab4382d2SGreg Kroah-Hartman .ioctl = uart_ioctl, 2405ab4382d2SGreg Kroah-Hartman .throttle = uart_throttle, 2406ab4382d2SGreg Kroah-Hartman .unthrottle = uart_unthrottle, 2407ab4382d2SGreg Kroah-Hartman .send_xchar = uart_send_xchar, 2408ab4382d2SGreg Kroah-Hartman .set_termios = uart_set_termios, 2409ab4382d2SGreg Kroah-Hartman .set_ldisc = uart_set_ldisc, 2410ab4382d2SGreg Kroah-Hartman .stop = uart_stop, 2411ab4382d2SGreg Kroah-Hartman .start = uart_start, 2412ab4382d2SGreg Kroah-Hartman .hangup = uart_hangup, 2413ab4382d2SGreg Kroah-Hartman .break_ctl = uart_break_ctl, 2414ab4382d2SGreg Kroah-Hartman .wait_until_sent= uart_wait_until_sent, 2415ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_PROC_FS 2416ab4382d2SGreg Kroah-Hartman .proc_fops = &uart_proc_fops, 2417ab4382d2SGreg Kroah-Hartman #endif 2418ab4382d2SGreg Kroah-Hartman .tiocmget = uart_tiocmget, 2419ab4382d2SGreg Kroah-Hartman .tiocmset = uart_tiocmset, 2420ab4382d2SGreg Kroah-Hartman .get_icount = uart_get_icount, 2421ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 2422ab4382d2SGreg Kroah-Hartman .poll_init = uart_poll_init, 2423ab4382d2SGreg Kroah-Hartman .poll_get_char = uart_poll_get_char, 2424ab4382d2SGreg Kroah-Hartman .poll_put_char = uart_poll_put_char, 2425ab4382d2SGreg Kroah-Hartman #endif 2426ab4382d2SGreg Kroah-Hartman }; 2427ab4382d2SGreg Kroah-Hartman 2428ab4382d2SGreg Kroah-Hartman static const struct tty_port_operations uart_port_ops = { 2429ab4382d2SGreg Kroah-Hartman .carrier_raised = uart_carrier_raised, 2430ab4382d2SGreg Kroah-Hartman .dtr_rts = uart_dtr_rts, 2431b3b57646SRob Herring .activate = uart_port_activate, 2432761ed4a9SRob Herring .shutdown = uart_tty_port_shutdown, 2433ab4382d2SGreg Kroah-Hartman }; 2434ab4382d2SGreg Kroah-Hartman 2435ab4382d2SGreg Kroah-Hartman /** 2436ab4382d2SGreg Kroah-Hartman * uart_register_driver - register a driver with the uart core layer 2437ab4382d2SGreg Kroah-Hartman * @drv: low level driver structure 2438ab4382d2SGreg Kroah-Hartman * 2439ab4382d2SGreg Kroah-Hartman * Register a uart driver with the core driver. We in turn register 2440ab4382d2SGreg Kroah-Hartman * with the tty layer, and initialise the core driver per-port state. 2441ab4382d2SGreg Kroah-Hartman * 2442ab4382d2SGreg Kroah-Hartman * We have a proc file in /proc/tty/driver which is named after the 2443ab4382d2SGreg Kroah-Hartman * normal driver. 2444ab4382d2SGreg Kroah-Hartman * 2445ab4382d2SGreg Kroah-Hartman * drv->port should be NULL, and the per-port structures should be 2446ab4382d2SGreg Kroah-Hartman * registered using uart_add_one_port after this call has succeeded. 2447ab4382d2SGreg Kroah-Hartman */ 2448ab4382d2SGreg Kroah-Hartman int uart_register_driver(struct uart_driver *drv) 2449ab4382d2SGreg Kroah-Hartman { 2450ab4382d2SGreg Kroah-Hartman struct tty_driver *normal; 2451ab4382d2SGreg Kroah-Hartman int i, retval; 2452ab4382d2SGreg Kroah-Hartman 2453ab4382d2SGreg Kroah-Hartman BUG_ON(drv->state); 2454ab4382d2SGreg Kroah-Hartman 2455ab4382d2SGreg Kroah-Hartman /* 2456ab4382d2SGreg Kroah-Hartman * Maybe we should be using a slab cache for this, especially if 2457ab4382d2SGreg Kroah-Hartman * we have a large number of ports to handle. 2458ab4382d2SGreg Kroah-Hartman */ 2459ab4382d2SGreg Kroah-Hartman drv->state = kzalloc(sizeof(struct uart_state) * drv->nr, GFP_KERNEL); 2460ab4382d2SGreg Kroah-Hartman if (!drv->state) 2461ab4382d2SGreg Kroah-Hartman goto out; 2462ab4382d2SGreg Kroah-Hartman 2463ab4382d2SGreg Kroah-Hartman normal = alloc_tty_driver(drv->nr); 2464ab4382d2SGreg Kroah-Hartman if (!normal) 2465ab4382d2SGreg Kroah-Hartman goto out_kfree; 2466ab4382d2SGreg Kroah-Hartman 2467ab4382d2SGreg Kroah-Hartman drv->tty_driver = normal; 2468ab4382d2SGreg Kroah-Hartman 2469ab4382d2SGreg Kroah-Hartman normal->driver_name = drv->driver_name; 2470ab4382d2SGreg Kroah-Hartman normal->name = drv->dev_name; 2471ab4382d2SGreg Kroah-Hartman normal->major = drv->major; 2472ab4382d2SGreg Kroah-Hartman normal->minor_start = drv->minor; 2473ab4382d2SGreg Kroah-Hartman normal->type = TTY_DRIVER_TYPE_SERIAL; 2474ab4382d2SGreg Kroah-Hartman normal->subtype = SERIAL_TYPE_NORMAL; 2475ab4382d2SGreg Kroah-Hartman normal->init_termios = tty_std_termios; 2476ab4382d2SGreg Kroah-Hartman normal->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; 2477ab4382d2SGreg Kroah-Hartman normal->init_termios.c_ispeed = normal->init_termios.c_ospeed = 9600; 2478ab4382d2SGreg Kroah-Hartman normal->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; 2479ab4382d2SGreg Kroah-Hartman normal->driver_state = drv; 2480ab4382d2SGreg Kroah-Hartman tty_set_operations(normal, &uart_ops); 2481ab4382d2SGreg Kroah-Hartman 2482ab4382d2SGreg Kroah-Hartman /* 2483ab4382d2SGreg Kroah-Hartman * Initialise the UART state(s). 2484ab4382d2SGreg Kroah-Hartman */ 2485ab4382d2SGreg Kroah-Hartman for (i = 0; i < drv->nr; i++) { 2486ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + i; 2487ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2488ab4382d2SGreg Kroah-Hartman 2489ab4382d2SGreg Kroah-Hartman tty_port_init(port); 2490ab4382d2SGreg Kroah-Hartman port->ops = &uart_port_ops; 2491ab4382d2SGreg Kroah-Hartman } 2492ab4382d2SGreg Kroah-Hartman 2493ab4382d2SGreg Kroah-Hartman retval = tty_register_driver(normal); 2494ab4382d2SGreg Kroah-Hartman if (retval >= 0) 2495ab4382d2SGreg Kroah-Hartman return retval; 2496ab4382d2SGreg Kroah-Hartman 2497191c5f10SJiri Slaby for (i = 0; i < drv->nr; i++) 2498191c5f10SJiri Slaby tty_port_destroy(&drv->state[i].port); 2499ab4382d2SGreg Kroah-Hartman put_tty_driver(normal); 2500ab4382d2SGreg Kroah-Hartman out_kfree: 2501ab4382d2SGreg Kroah-Hartman kfree(drv->state); 2502ab4382d2SGreg Kroah-Hartman out: 2503ab4382d2SGreg Kroah-Hartman return -ENOMEM; 2504ab4382d2SGreg Kroah-Hartman } 2505ab4382d2SGreg Kroah-Hartman 2506ab4382d2SGreg Kroah-Hartman /** 2507ab4382d2SGreg Kroah-Hartman * uart_unregister_driver - remove a driver from the uart core layer 2508ab4382d2SGreg Kroah-Hartman * @drv: low level driver structure 2509ab4382d2SGreg Kroah-Hartman * 2510ab4382d2SGreg Kroah-Hartman * Remove all references to a driver from the core driver. The low 2511ab4382d2SGreg Kroah-Hartman * level driver must have removed all its ports via the 2512ab4382d2SGreg Kroah-Hartman * uart_remove_one_port() if it registered them with uart_add_one_port(). 2513ab4382d2SGreg Kroah-Hartman * (ie, drv->port == NULL) 2514ab4382d2SGreg Kroah-Hartman */ 2515ab4382d2SGreg Kroah-Hartman void uart_unregister_driver(struct uart_driver *drv) 2516ab4382d2SGreg Kroah-Hartman { 2517ab4382d2SGreg Kroah-Hartman struct tty_driver *p = drv->tty_driver; 2518191c5f10SJiri Slaby unsigned int i; 2519191c5f10SJiri Slaby 2520ab4382d2SGreg Kroah-Hartman tty_unregister_driver(p); 2521ab4382d2SGreg Kroah-Hartman put_tty_driver(p); 2522191c5f10SJiri Slaby for (i = 0; i < drv->nr; i++) 2523191c5f10SJiri Slaby tty_port_destroy(&drv->state[i].port); 2524ab4382d2SGreg Kroah-Hartman kfree(drv->state); 25251e66cdedSAlan Cox drv->state = NULL; 2526ab4382d2SGreg Kroah-Hartman drv->tty_driver = NULL; 2527ab4382d2SGreg Kroah-Hartman } 2528ab4382d2SGreg Kroah-Hartman 2529ab4382d2SGreg Kroah-Hartman struct tty_driver *uart_console_device(struct console *co, int *index) 2530ab4382d2SGreg Kroah-Hartman { 2531ab4382d2SGreg Kroah-Hartman struct uart_driver *p = co->data; 2532ab4382d2SGreg Kroah-Hartman *index = co->index; 2533ab4382d2SGreg Kroah-Hartman return p->tty_driver; 2534ab4382d2SGreg Kroah-Hartman } 2535ab4382d2SGreg Kroah-Hartman 25366915c0e4STomas Hlavacek static ssize_t uart_get_attr_uartclk(struct device *dev, 25376915c0e4STomas Hlavacek struct device_attribute *attr, char *buf) 25386915c0e4STomas Hlavacek { 2539bebe73e3SAlan Cox struct serial_struct tmp; 25406915c0e4STomas Hlavacek struct tty_port *port = dev_get_drvdata(dev); 2541b1b79916STomas Hlavacek 25429f109694SAlan Cox uart_get_info(port, &tmp); 2543bebe73e3SAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.baud_base * 16); 25446915c0e4STomas Hlavacek } 25456915c0e4STomas Hlavacek 2546373bac4cSAlan Cox static ssize_t uart_get_attr_type(struct device *dev, 2547373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2548373bac4cSAlan Cox { 2549373bac4cSAlan Cox struct serial_struct tmp; 2550373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2551373bac4cSAlan Cox 2552373bac4cSAlan Cox uart_get_info(port, &tmp); 2553373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.type); 2554373bac4cSAlan Cox } 2555373bac4cSAlan Cox static ssize_t uart_get_attr_line(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.line); 2563373bac4cSAlan Cox } 2564373bac4cSAlan Cox 2565373bac4cSAlan Cox static ssize_t uart_get_attr_port(struct device *dev, 2566373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2567373bac4cSAlan Cox { 2568373bac4cSAlan Cox struct serial_struct tmp; 2569373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2570fd985e1dSAndrew Morton unsigned long ioaddr; 2571373bac4cSAlan Cox 2572373bac4cSAlan Cox uart_get_info(port, &tmp); 2573fd985e1dSAndrew Morton ioaddr = tmp.port; 2574fd985e1dSAndrew Morton if (HIGH_BITS_OFFSET) 2575fd985e1dSAndrew Morton ioaddr |= (unsigned long)tmp.port_high << HIGH_BITS_OFFSET; 2576fd985e1dSAndrew Morton return snprintf(buf, PAGE_SIZE, "0x%lX\n", ioaddr); 2577373bac4cSAlan Cox } 2578373bac4cSAlan Cox 2579373bac4cSAlan Cox static ssize_t uart_get_attr_irq(struct device *dev, 2580373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2581373bac4cSAlan Cox { 2582373bac4cSAlan Cox struct serial_struct tmp; 2583373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2584373bac4cSAlan Cox 2585373bac4cSAlan Cox uart_get_info(port, &tmp); 2586373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.irq); 2587373bac4cSAlan Cox } 2588373bac4cSAlan Cox 2589373bac4cSAlan Cox static ssize_t uart_get_attr_flags(struct device *dev, 2590373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2591373bac4cSAlan Cox { 2592373bac4cSAlan Cox struct serial_struct tmp; 2593373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2594373bac4cSAlan Cox 2595373bac4cSAlan Cox uart_get_info(port, &tmp); 2596373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "0x%X\n", tmp.flags); 2597373bac4cSAlan Cox } 2598373bac4cSAlan Cox 2599373bac4cSAlan Cox static ssize_t uart_get_attr_xmit_fifo_size(struct device *dev, 2600373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2601373bac4cSAlan Cox { 2602373bac4cSAlan Cox struct serial_struct tmp; 2603373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2604373bac4cSAlan Cox 2605373bac4cSAlan Cox uart_get_info(port, &tmp); 2606373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.xmit_fifo_size); 2607373bac4cSAlan Cox } 2608373bac4cSAlan Cox 2609373bac4cSAlan Cox 2610373bac4cSAlan Cox static ssize_t uart_get_attr_close_delay(struct device *dev, 2611373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2612373bac4cSAlan Cox { 2613373bac4cSAlan Cox struct serial_struct tmp; 2614373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2615373bac4cSAlan Cox 2616373bac4cSAlan Cox uart_get_info(port, &tmp); 2617373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.close_delay); 2618373bac4cSAlan Cox } 2619373bac4cSAlan Cox 2620373bac4cSAlan Cox 2621373bac4cSAlan Cox static ssize_t uart_get_attr_closing_wait(struct device *dev, 2622373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2623373bac4cSAlan Cox { 2624373bac4cSAlan Cox struct serial_struct tmp; 2625373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2626373bac4cSAlan Cox 2627373bac4cSAlan Cox uart_get_info(port, &tmp); 2628373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.closing_wait); 2629373bac4cSAlan Cox } 2630373bac4cSAlan Cox 2631373bac4cSAlan Cox static ssize_t uart_get_attr_custom_divisor(struct device *dev, 2632373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2633373bac4cSAlan Cox { 2634373bac4cSAlan Cox struct serial_struct tmp; 2635373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2636373bac4cSAlan Cox 2637373bac4cSAlan Cox uart_get_info(port, &tmp); 2638373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.custom_divisor); 2639373bac4cSAlan Cox } 2640373bac4cSAlan Cox 2641373bac4cSAlan Cox static ssize_t uart_get_attr_io_type(struct device *dev, 2642373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2643373bac4cSAlan Cox { 2644373bac4cSAlan Cox struct serial_struct tmp; 2645373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2646373bac4cSAlan Cox 2647373bac4cSAlan Cox uart_get_info(port, &tmp); 2648373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.io_type); 2649373bac4cSAlan Cox } 2650373bac4cSAlan Cox 2651373bac4cSAlan Cox static ssize_t uart_get_attr_iomem_base(struct device *dev, 2652373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2653373bac4cSAlan Cox { 2654373bac4cSAlan Cox struct serial_struct tmp; 2655373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2656373bac4cSAlan Cox 2657373bac4cSAlan Cox uart_get_info(port, &tmp); 2658373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "0x%lX\n", (unsigned long)tmp.iomem_base); 2659373bac4cSAlan Cox } 2660373bac4cSAlan Cox 2661373bac4cSAlan Cox static ssize_t uart_get_attr_iomem_reg_shift(struct device *dev, 2662373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2663373bac4cSAlan Cox { 2664373bac4cSAlan Cox struct serial_struct tmp; 2665373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2666373bac4cSAlan Cox 2667373bac4cSAlan Cox uart_get_info(port, &tmp); 2668373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.iomem_reg_shift); 2669373bac4cSAlan Cox } 2670373bac4cSAlan Cox 2671373bac4cSAlan Cox static DEVICE_ATTR(type, S_IRUSR | S_IRGRP, uart_get_attr_type, NULL); 2672373bac4cSAlan Cox static DEVICE_ATTR(line, S_IRUSR | S_IRGRP, uart_get_attr_line, NULL); 2673373bac4cSAlan Cox static DEVICE_ATTR(port, S_IRUSR | S_IRGRP, uart_get_attr_port, NULL); 2674373bac4cSAlan Cox static DEVICE_ATTR(irq, S_IRUSR | S_IRGRP, uart_get_attr_irq, NULL); 2675373bac4cSAlan Cox static DEVICE_ATTR(flags, S_IRUSR | S_IRGRP, uart_get_attr_flags, NULL); 2676373bac4cSAlan Cox static DEVICE_ATTR(xmit_fifo_size, S_IRUSR | S_IRGRP, uart_get_attr_xmit_fifo_size, NULL); 26776915c0e4STomas Hlavacek static DEVICE_ATTR(uartclk, S_IRUSR | S_IRGRP, uart_get_attr_uartclk, NULL); 2678373bac4cSAlan Cox static DEVICE_ATTR(close_delay, S_IRUSR | S_IRGRP, uart_get_attr_close_delay, NULL); 2679373bac4cSAlan Cox static DEVICE_ATTR(closing_wait, S_IRUSR | S_IRGRP, uart_get_attr_closing_wait, NULL); 2680373bac4cSAlan Cox static DEVICE_ATTR(custom_divisor, S_IRUSR | S_IRGRP, uart_get_attr_custom_divisor, NULL); 2681373bac4cSAlan Cox static DEVICE_ATTR(io_type, S_IRUSR | S_IRGRP, uart_get_attr_io_type, NULL); 2682373bac4cSAlan Cox static DEVICE_ATTR(iomem_base, S_IRUSR | S_IRGRP, uart_get_attr_iomem_base, NULL); 2683373bac4cSAlan Cox static DEVICE_ATTR(iomem_reg_shift, S_IRUSR | S_IRGRP, uart_get_attr_iomem_reg_shift, NULL); 26846915c0e4STomas Hlavacek 26856915c0e4STomas Hlavacek static struct attribute *tty_dev_attrs[] = { 2686373bac4cSAlan Cox &dev_attr_type.attr, 2687373bac4cSAlan Cox &dev_attr_line.attr, 2688373bac4cSAlan Cox &dev_attr_port.attr, 2689373bac4cSAlan Cox &dev_attr_irq.attr, 2690373bac4cSAlan Cox &dev_attr_flags.attr, 2691373bac4cSAlan Cox &dev_attr_xmit_fifo_size.attr, 26926915c0e4STomas Hlavacek &dev_attr_uartclk.attr, 2693373bac4cSAlan Cox &dev_attr_close_delay.attr, 2694373bac4cSAlan Cox &dev_attr_closing_wait.attr, 2695373bac4cSAlan Cox &dev_attr_custom_divisor.attr, 2696373bac4cSAlan Cox &dev_attr_io_type.attr, 2697373bac4cSAlan Cox &dev_attr_iomem_base.attr, 2698373bac4cSAlan Cox &dev_attr_iomem_reg_shift.attr, 26996915c0e4STomas Hlavacek NULL, 27006915c0e4STomas Hlavacek }; 27016915c0e4STomas Hlavacek 2702b1b79916STomas Hlavacek static const struct attribute_group tty_dev_attr_group = { 27036915c0e4STomas Hlavacek .attrs = tty_dev_attrs, 27046915c0e4STomas Hlavacek }; 27056915c0e4STomas Hlavacek 2706ab4382d2SGreg Kroah-Hartman /** 2707ab4382d2SGreg Kroah-Hartman * uart_add_one_port - attach a driver-defined port structure 2708ab4382d2SGreg Kroah-Hartman * @drv: pointer to the uart low level driver structure for this port 2709ab4382d2SGreg Kroah-Hartman * @uport: uart port structure to use for this port. 2710ab4382d2SGreg Kroah-Hartman * 2711ab4382d2SGreg Kroah-Hartman * This allows the driver to register its own uart_port structure 2712ab4382d2SGreg Kroah-Hartman * with the core driver. The main purpose is to allow the low 2713ab4382d2SGreg Kroah-Hartman * level uart drivers to expand uart_port, rather than having yet 2714ab4382d2SGreg Kroah-Hartman * more levels of structures. 2715ab4382d2SGreg Kroah-Hartman */ 2716ab4382d2SGreg Kroah-Hartman int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport) 2717ab4382d2SGreg Kroah-Hartman { 2718ab4382d2SGreg Kroah-Hartman struct uart_state *state; 2719ab4382d2SGreg Kroah-Hartman struct tty_port *port; 2720ab4382d2SGreg Kroah-Hartman int ret = 0; 2721ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 2722266dcff0SGreg Kroah-Hartman int num_groups; 2723ab4382d2SGreg Kroah-Hartman 2724ab4382d2SGreg Kroah-Hartman BUG_ON(in_interrupt()); 2725ab4382d2SGreg Kroah-Hartman 2726ab4382d2SGreg Kroah-Hartman if (uport->line >= drv->nr) 2727ab4382d2SGreg Kroah-Hartman return -EINVAL; 2728ab4382d2SGreg Kroah-Hartman 2729ab4382d2SGreg Kroah-Hartman state = drv->state + uport->line; 2730ab4382d2SGreg Kroah-Hartman port = &state->port; 2731ab4382d2SGreg Kroah-Hartman 2732ab4382d2SGreg Kroah-Hartman mutex_lock(&port_mutex); 2733ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2734ab4382d2SGreg Kroah-Hartman if (state->uart_port) { 2735ab4382d2SGreg Kroah-Hartman ret = -EINVAL; 2736ab4382d2SGreg Kroah-Hartman goto out; 2737ab4382d2SGreg Kroah-Hartman } 2738ab4382d2SGreg Kroah-Hartman 27392b702b9bSPeter Hurley /* Link the port to the driver state table and vice versa */ 27409ed19428SPeter Hurley atomic_set(&state->refcount, 1); 27419ed19428SPeter Hurley init_waitqueue_head(&state->remove_wait); 2742ab4382d2SGreg Kroah-Hartman state->uart_port = uport; 2743ab4382d2SGreg Kroah-Hartman uport->state = state; 2744ab4382d2SGreg Kroah-Hartman 27452b702b9bSPeter Hurley state->pm_state = UART_PM_STATE_UNDEFINED; 27462b702b9bSPeter Hurley uport->cons = drv->cons; 2747959801feSPeter Hurley uport->minor = drv->tty_driver->minor_start + uport->line; 2748f7048b15SVignesh R uport->name = kasprintf(GFP_KERNEL, "%s%d", drv->dev_name, 2749f7048b15SVignesh R drv->tty_driver->name_base + uport->line); 2750f7048b15SVignesh R if (!uport->name) { 2751f7048b15SVignesh R ret = -ENOMEM; 2752f7048b15SVignesh R goto out; 2753f7048b15SVignesh R } 27542b702b9bSPeter Hurley 2755ab4382d2SGreg Kroah-Hartman /* 2756ab4382d2SGreg Kroah-Hartman * If this port is a console, then the spinlock is already 2757ab4382d2SGreg Kroah-Hartman * initialised. 2758ab4382d2SGreg Kroah-Hartman */ 2759ab4382d2SGreg Kroah-Hartman if (!(uart_console(uport) && (uport->cons->flags & CON_ENABLED))) { 2760ab4382d2SGreg Kroah-Hartman spin_lock_init(&uport->lock); 2761ab4382d2SGreg Kroah-Hartman lockdep_set_class(&uport->lock, &port_lock_key); 2762ab4382d2SGreg Kroah-Hartman } 2763a208ffd2SGrant Likely if (uport->cons && uport->dev) 2764a208ffd2SGrant Likely of_console_check(uport->dev->of_node, uport->cons->name, uport->line); 2765ab4382d2SGreg Kroah-Hartman 2766ab4382d2SGreg Kroah-Hartman uart_configure_port(drv, state, uport); 2767ab4382d2SGreg Kroah-Hartman 27684dda864dSGeert Uytterhoeven port->console = uart_console(uport); 27694dda864dSGeert Uytterhoeven 2770266dcff0SGreg Kroah-Hartman num_groups = 2; 2771266dcff0SGreg Kroah-Hartman if (uport->attr_group) 2772266dcff0SGreg Kroah-Hartman num_groups++; 2773266dcff0SGreg Kroah-Hartman 2774c2b703b8SYoshihiro YUNOMAE uport->tty_groups = kcalloc(num_groups, sizeof(*uport->tty_groups), 2775266dcff0SGreg Kroah-Hartman GFP_KERNEL); 2776266dcff0SGreg Kroah-Hartman if (!uport->tty_groups) { 2777266dcff0SGreg Kroah-Hartman ret = -ENOMEM; 2778266dcff0SGreg Kroah-Hartman goto out; 2779266dcff0SGreg Kroah-Hartman } 2780266dcff0SGreg Kroah-Hartman uport->tty_groups[0] = &tty_dev_attr_group; 2781266dcff0SGreg Kroah-Hartman if (uport->attr_group) 2782266dcff0SGreg Kroah-Hartman uport->tty_groups[1] = uport->attr_group; 2783266dcff0SGreg Kroah-Hartman 2784ab4382d2SGreg Kroah-Hartman /* 2785ab4382d2SGreg Kroah-Hartman * Register the port whether it's detected or not. This allows 2786015355b7SGeert Uytterhoeven * setserial to be used to alter this port's parameters. 2787ab4382d2SGreg Kroah-Hartman */ 2788da4c2799SJohan Hovold tty_dev = tty_port_register_device_attr_serdev(port, drv->tty_driver, 2789266dcff0SGreg Kroah-Hartman uport->line, uport->dev, port, uport->tty_groups); 2790ab4382d2SGreg Kroah-Hartman if (likely(!IS_ERR(tty_dev))) { 279177359835SSimon Glass device_set_wakeup_capable(tty_dev, 1); 279277359835SSimon Glass } else { 27932f2dafe7SSudip Mukherjee dev_err(uport->dev, "Cannot register tty device on line %d\n", 2794ab4382d2SGreg Kroah-Hartman uport->line); 279577359835SSimon Glass } 2796ab4382d2SGreg Kroah-Hartman 2797ab4382d2SGreg Kroah-Hartman /* 2798ab4382d2SGreg Kroah-Hartman * Ensure UPF_DEAD is not set. 2799ab4382d2SGreg Kroah-Hartman */ 2800ab4382d2SGreg Kroah-Hartman uport->flags &= ~UPF_DEAD; 2801ab4382d2SGreg Kroah-Hartman 2802ab4382d2SGreg Kroah-Hartman out: 2803ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2804ab4382d2SGreg Kroah-Hartman mutex_unlock(&port_mutex); 2805ab4382d2SGreg Kroah-Hartman 2806ab4382d2SGreg Kroah-Hartman return ret; 2807ab4382d2SGreg Kroah-Hartman } 2808ab4382d2SGreg Kroah-Hartman 2809ab4382d2SGreg Kroah-Hartman /** 2810ab4382d2SGreg Kroah-Hartman * uart_remove_one_port - detach a driver defined port structure 2811ab4382d2SGreg Kroah-Hartman * @drv: pointer to the uart low level driver structure for this port 2812ab4382d2SGreg Kroah-Hartman * @uport: uart port structure for this port 2813ab4382d2SGreg Kroah-Hartman * 2814ab4382d2SGreg Kroah-Hartman * This unhooks (and hangs up) the specified port structure from the 2815ab4382d2SGreg Kroah-Hartman * core driver. No further calls will be made to the low-level code 2816ab4382d2SGreg Kroah-Hartman * for this port. 2817ab4382d2SGreg Kroah-Hartman */ 2818ab4382d2SGreg Kroah-Hartman int uart_remove_one_port(struct uart_driver *drv, struct uart_port *uport) 2819ab4382d2SGreg Kroah-Hartman { 2820ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 2821ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 28224047b371SPeter Hurley struct uart_port *uart_port; 28234c6d5b4dSGeert Uytterhoeven struct tty_struct *tty; 2824b342dd51SChen Gang int ret = 0; 2825ab4382d2SGreg Kroah-Hartman 2826ab4382d2SGreg Kroah-Hartman BUG_ON(in_interrupt()); 2827ab4382d2SGreg Kroah-Hartman 2828ab4382d2SGreg Kroah-Hartman mutex_lock(&port_mutex); 2829ab4382d2SGreg Kroah-Hartman 2830ab4382d2SGreg Kroah-Hartman /* 2831ab4382d2SGreg Kroah-Hartman * Mark the port "dead" - this prevents any opens from 2832ab4382d2SGreg Kroah-Hartman * succeeding while we shut down the port. 2833ab4382d2SGreg Kroah-Hartman */ 2834ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 28354047b371SPeter Hurley uart_port = uart_port_check(state); 28364047b371SPeter Hurley if (uart_port != uport) 28374047b371SPeter Hurley dev_alert(uport->dev, "Removing wrong port: %p != %p\n", 28384047b371SPeter Hurley uart_port, uport); 28394047b371SPeter Hurley 28404047b371SPeter Hurley if (!uart_port) { 2841b342dd51SChen Gang mutex_unlock(&port->mutex); 2842b342dd51SChen Gang ret = -EINVAL; 2843b342dd51SChen Gang goto out; 2844b342dd51SChen Gang } 2845ab4382d2SGreg Kroah-Hartman uport->flags |= UPF_DEAD; 2846ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2847ab4382d2SGreg Kroah-Hartman 2848ab4382d2SGreg Kroah-Hartman /* 2849ab4382d2SGreg Kroah-Hartman * Remove the devices from the tty layer 2850ab4382d2SGreg Kroah-Hartman */ 2851da4c2799SJohan Hovold tty_port_unregister_device(port, drv->tty_driver, uport->line); 2852ab4382d2SGreg Kroah-Hartman 28534c6d5b4dSGeert Uytterhoeven tty = tty_port_tty_get(port); 28544c6d5b4dSGeert Uytterhoeven if (tty) { 2855ab4382d2SGreg Kroah-Hartman tty_vhangup(port->tty); 28564c6d5b4dSGeert Uytterhoeven tty_kref_put(tty); 28574c6d5b4dSGeert Uytterhoeven } 2858ab4382d2SGreg Kroah-Hartman 2859ab4382d2SGreg Kroah-Hartman /* 28605f5c9ae5SGeert Uytterhoeven * If the port is used as a console, unregister it 28615f5c9ae5SGeert Uytterhoeven */ 28625f5c9ae5SGeert Uytterhoeven if (uart_console(uport)) 28635f5c9ae5SGeert Uytterhoeven unregister_console(uport->cons); 28645f5c9ae5SGeert Uytterhoeven 28655f5c9ae5SGeert Uytterhoeven /* 2866ab4382d2SGreg Kroah-Hartman * Free the port IO and memory resources, if any. 2867ab4382d2SGreg Kroah-Hartman */ 2868a7cfaf16SFabio Estevam if (uport->type != PORT_UNKNOWN && uport->ops->release_port) 2869ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 2870266dcff0SGreg Kroah-Hartman kfree(uport->tty_groups); 2871f7048b15SVignesh R kfree(uport->name); 2872ab4382d2SGreg Kroah-Hartman 2873ab4382d2SGreg Kroah-Hartman /* 2874ab4382d2SGreg Kroah-Hartman * Indicate that there isn't a port here anymore. 2875ab4382d2SGreg Kroah-Hartman */ 2876ab4382d2SGreg Kroah-Hartman uport->type = PORT_UNKNOWN; 2877ab4382d2SGreg Kroah-Hartman 28784047b371SPeter Hurley mutex_lock(&port->mutex); 28799ed19428SPeter Hurley WARN_ON(atomic_dec_return(&state->refcount) < 0); 28809ed19428SPeter Hurley wait_event(state->remove_wait, !atomic_read(&state->refcount)); 2881ab4382d2SGreg Kroah-Hartman state->uart_port = NULL; 28824047b371SPeter Hurley mutex_unlock(&port->mutex); 2883b342dd51SChen Gang out: 2884ab4382d2SGreg Kroah-Hartman mutex_unlock(&port_mutex); 2885ab4382d2SGreg Kroah-Hartman 2886b342dd51SChen Gang return ret; 2887ab4382d2SGreg Kroah-Hartman } 2888ab4382d2SGreg Kroah-Hartman 2889ab4382d2SGreg Kroah-Hartman /* 2890ab4382d2SGreg Kroah-Hartman * Are the two ports equivalent? 2891ab4382d2SGreg Kroah-Hartman */ 2892ab4382d2SGreg Kroah-Hartman int uart_match_port(struct uart_port *port1, struct uart_port *port2) 2893ab4382d2SGreg Kroah-Hartman { 2894ab4382d2SGreg Kroah-Hartman if (port1->iotype != port2->iotype) 2895ab4382d2SGreg Kroah-Hartman return 0; 2896ab4382d2SGreg Kroah-Hartman 2897ab4382d2SGreg Kroah-Hartman switch (port1->iotype) { 2898ab4382d2SGreg Kroah-Hartman case UPIO_PORT: 2899ab4382d2SGreg Kroah-Hartman return (port1->iobase == port2->iobase); 2900ab4382d2SGreg Kroah-Hartman case UPIO_HUB6: 2901ab4382d2SGreg Kroah-Hartman return (port1->iobase == port2->iobase) && 2902ab4382d2SGreg Kroah-Hartman (port1->hub6 == port2->hub6); 2903ab4382d2SGreg Kroah-Hartman case UPIO_MEM: 2904bd94c407SMasahiro Yamada case UPIO_MEM16: 2905ab4382d2SGreg Kroah-Hartman case UPIO_MEM32: 29063ffb1a81SKevin Cernekee case UPIO_MEM32BE: 2907ab4382d2SGreg Kroah-Hartman case UPIO_AU: 2908ab4382d2SGreg Kroah-Hartman case UPIO_TSI: 2909ab4382d2SGreg Kroah-Hartman return (port1->mapbase == port2->mapbase); 2910ab4382d2SGreg Kroah-Hartman } 2911ab4382d2SGreg Kroah-Hartman return 0; 2912ab4382d2SGreg Kroah-Hartman } 2913ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_match_port); 2914ab4382d2SGreg Kroah-Hartman 2915027d7dacSJiri Slaby /** 2916027d7dacSJiri Slaby * uart_handle_dcd_change - handle a change of carrier detect state 2917027d7dacSJiri Slaby * @uport: uart_port structure for the open port 2918027d7dacSJiri Slaby * @status: new carrier detect status, nonzero if active 29194d90bb14SPeter Hurley * 29204d90bb14SPeter Hurley * Caller must hold uport->lock 2921027d7dacSJiri Slaby */ 2922027d7dacSJiri Slaby void uart_handle_dcd_change(struct uart_port *uport, unsigned int status) 2923027d7dacSJiri Slaby { 292442381572SGeorge Spelvin struct tty_port *port = &uport->state->port; 292543eca0aeSAlan Cox struct tty_struct *tty = port->tty; 2926c993257bSPeter Hurley struct tty_ldisc *ld; 2927027d7dacSJiri Slaby 29284d90bb14SPeter Hurley lockdep_assert_held_once(&uport->lock); 29294d90bb14SPeter Hurley 2930c993257bSPeter Hurley if (tty) { 2931c993257bSPeter Hurley ld = tty_ldisc_ref(tty); 293242381572SGeorge Spelvin if (ld) { 293342381572SGeorge Spelvin if (ld->ops->dcd_change) 2934593fb1aeSGeorge Spelvin ld->ops->dcd_change(tty, status); 293542381572SGeorge Spelvin tty_ldisc_deref(ld); 293642381572SGeorge Spelvin } 2937c993257bSPeter Hurley } 2938027d7dacSJiri Slaby 2939027d7dacSJiri Slaby uport->icount.dcd++; 2940027d7dacSJiri Slaby 2941299245a1SPeter Hurley if (uart_dcd_enabled(uport)) { 2942027d7dacSJiri Slaby if (status) 2943027d7dacSJiri Slaby wake_up_interruptible(&port->open_wait); 294443eca0aeSAlan Cox else if (tty) 294543eca0aeSAlan Cox tty_hangup(tty); 2946027d7dacSJiri Slaby } 2947027d7dacSJiri Slaby } 2948027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_handle_dcd_change); 2949027d7dacSJiri Slaby 2950027d7dacSJiri Slaby /** 2951027d7dacSJiri Slaby * uart_handle_cts_change - handle a change of clear-to-send state 2952027d7dacSJiri Slaby * @uport: uart_port structure for the open port 2953027d7dacSJiri Slaby * @status: new clear to send status, nonzero if active 29544d90bb14SPeter Hurley * 29554d90bb14SPeter Hurley * Caller must hold uport->lock 2956027d7dacSJiri Slaby */ 2957027d7dacSJiri Slaby void uart_handle_cts_change(struct uart_port *uport, unsigned int status) 2958027d7dacSJiri Slaby { 29594d90bb14SPeter Hurley lockdep_assert_held_once(&uport->lock); 29604d90bb14SPeter Hurley 2961027d7dacSJiri Slaby uport->icount.cts++; 2962027d7dacSJiri Slaby 2963391f93f2SPeter Hurley if (uart_softcts_mode(uport)) { 2964d01f4d18SPeter Hurley if (uport->hw_stopped) { 2965027d7dacSJiri Slaby if (status) { 2966d01f4d18SPeter Hurley uport->hw_stopped = 0; 2967027d7dacSJiri Slaby uport->ops->start_tx(uport); 2968027d7dacSJiri Slaby uart_write_wakeup(uport); 2969027d7dacSJiri Slaby } 2970027d7dacSJiri Slaby } else { 2971027d7dacSJiri Slaby if (!status) { 2972d01f4d18SPeter Hurley uport->hw_stopped = 1; 2973027d7dacSJiri Slaby uport->ops->stop_tx(uport); 2974027d7dacSJiri Slaby } 2975027d7dacSJiri Slaby } 2976391f93f2SPeter Hurley 2977027d7dacSJiri Slaby } 2978027d7dacSJiri Slaby } 2979027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_handle_cts_change); 2980027d7dacSJiri Slaby 2981cf75525fSJiri Slaby /** 2982cf75525fSJiri Slaby * uart_insert_char - push a char to the uart layer 2983cf75525fSJiri Slaby * 2984cf75525fSJiri Slaby * User is responsible to call tty_flip_buffer_push when they are done with 2985cf75525fSJiri Slaby * insertion. 2986cf75525fSJiri Slaby * 2987cf75525fSJiri Slaby * @port: corresponding port 2988cf75525fSJiri Slaby * @status: state of the serial port RX buffer (LSR for 8250) 2989cf75525fSJiri Slaby * @overrun: mask of overrun bits in @status 2990cf75525fSJiri Slaby * @ch: character to push 2991cf75525fSJiri Slaby * @flag: flag for the character (see TTY_NORMAL and friends) 2992cf75525fSJiri Slaby */ 2993027d7dacSJiri Slaby void uart_insert_char(struct uart_port *port, unsigned int status, 2994027d7dacSJiri Slaby unsigned int overrun, unsigned int ch, unsigned int flag) 2995027d7dacSJiri Slaby { 299692a19f9cSJiri Slaby struct tty_port *tport = &port->state->port; 2997027d7dacSJiri Slaby 2998027d7dacSJiri Slaby if ((status & port->ignore_status_mask & ~overrun) == 0) 299992a19f9cSJiri Slaby if (tty_insert_flip_char(tport, ch, flag) == 0) 3000dabfb351SCorbin ++port->icount.buf_overrun; 3001027d7dacSJiri Slaby 3002027d7dacSJiri Slaby /* 3003027d7dacSJiri Slaby * Overrun is special. Since it's reported immediately, 3004027d7dacSJiri Slaby * it doesn't affect the current character. 3005027d7dacSJiri Slaby */ 3006027d7dacSJiri Slaby if (status & ~port->ignore_status_mask & overrun) 300792a19f9cSJiri Slaby if (tty_insert_flip_char(tport, 0, TTY_OVERRUN) == 0) 3008dabfb351SCorbin ++port->icount.buf_overrun; 3009027d7dacSJiri Slaby } 3010027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_insert_char); 3011027d7dacSJiri Slaby 3012ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_write_wakeup); 3013ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_register_driver); 3014ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_unregister_driver); 3015ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_suspend_port); 3016ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_resume_port); 3017ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_add_one_port); 3018ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_remove_one_port); 3019ab4382d2SGreg Kroah-Hartman 3020ef838a81SUwe Kleine-König /** 3021743f93f8SLukas Wunner * uart_get_rs485_mode() - retrieve rs485 properties for given uart 3022743f93f8SLukas Wunner * @dev: uart device 3023ef838a81SUwe Kleine-König * @rs485conf: output parameter 3024ef838a81SUwe Kleine-König * 3025ef838a81SUwe Kleine-König * This function implements the device tree binding described in 3026ef838a81SUwe Kleine-König * Documentation/devicetree/bindings/serial/rs485.txt. 3027ef838a81SUwe Kleine-König */ 3028743f93f8SLukas Wunner void uart_get_rs485_mode(struct device *dev, struct serial_rs485 *rs485conf) 3029ef838a81SUwe Kleine-König { 3030ef838a81SUwe Kleine-König u32 rs485_delay[2]; 3031ef838a81SUwe Kleine-König int ret; 3032ef838a81SUwe Kleine-König 3033743f93f8SLukas Wunner ret = device_property_read_u32_array(dev, "rs485-rts-delay", 3034743f93f8SLukas Wunner rs485_delay, 2); 3035ef838a81SUwe Kleine-König if (!ret) { 3036ef838a81SUwe Kleine-König rs485conf->delay_rts_before_send = rs485_delay[0]; 3037ef838a81SUwe Kleine-König rs485conf->delay_rts_after_send = rs485_delay[1]; 3038ef838a81SUwe Kleine-König } else { 3039ef838a81SUwe Kleine-König rs485conf->delay_rts_before_send = 0; 3040ef838a81SUwe Kleine-König rs485conf->delay_rts_after_send = 0; 3041ef838a81SUwe Kleine-König } 3042ef838a81SUwe Kleine-König 3043ef838a81SUwe Kleine-König /* 3044f1e5b618SLukas Wunner * Clear full-duplex and enabled flags, set RTS polarity to active high 3045f1e5b618SLukas Wunner * to get to a defined state with the following properties: 3046ef838a81SUwe Kleine-König */ 3047f1e5b618SLukas Wunner rs485conf->flags &= ~(SER_RS485_RX_DURING_TX | SER_RS485_ENABLED | 3048f1e5b618SLukas Wunner SER_RS485_RTS_AFTER_SEND); 3049f1e5b618SLukas Wunner rs485conf->flags |= SER_RS485_RTS_ON_SEND; 3050ef838a81SUwe Kleine-König 3051743f93f8SLukas Wunner if (device_property_read_bool(dev, "rs485-rx-during-tx")) 3052ef838a81SUwe Kleine-König rs485conf->flags |= SER_RS485_RX_DURING_TX; 3053ef838a81SUwe Kleine-König 3054743f93f8SLukas Wunner if (device_property_read_bool(dev, "linux,rs485-enabled-at-boot-time")) 3055ef838a81SUwe Kleine-König rs485conf->flags |= SER_RS485_ENABLED; 3056f1e5b618SLukas Wunner 3057f1e5b618SLukas Wunner if (device_property_read_bool(dev, "rs485-rts-active-low")) { 3058f1e5b618SLukas Wunner rs485conf->flags &= ~SER_RS485_RTS_ON_SEND; 3059f1e5b618SLukas Wunner rs485conf->flags |= SER_RS485_RTS_AFTER_SEND; 3060f1e5b618SLukas Wunner } 3061ef838a81SUwe Kleine-König } 3062743f93f8SLukas Wunner EXPORT_SYMBOL_GPL(uart_get_rs485_mode); 3063ef838a81SUwe Kleine-König 3064ab4382d2SGreg Kroah-Hartman MODULE_DESCRIPTION("Serial driver core"); 3065ab4382d2SGreg Kroah-Hartman MODULE_LICENSE("GPL"); 3066