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> 17167cbce2SJohan Hovold #include <linux/gpio/consumer.h> 18a208ffd2SGrant Likely #include <linux/of.h> 19ab4382d2SGreg Kroah-Hartman #include <linux/proc_fs.h> 20ab4382d2SGreg Kroah-Hartman #include <linux/seq_file.h> 21ab4382d2SGreg Kroah-Hartman #include <linux/device.h> 22ab4382d2SGreg Kroah-Hartman #include <linux/serial.h> /* for serial_state and serial_icounter_struct */ 23ab4382d2SGreg Kroah-Hartman #include <linux/serial_core.h> 2468af4317SDmitry Safonov #include <linux/sysrq.h> 25ab4382d2SGreg Kroah-Hartman #include <linux/delay.h> 26ab4382d2SGreg Kroah-Hartman #include <linux/mutex.h> 27794edf30SDavid Howells #include <linux/security.h> 28ab4382d2SGreg Kroah-Hartman 29aef3ad10SAndy Shevchenko #include <linux/irq.h> 307c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 31ab4382d2SGreg Kroah-Hartman 32ab4382d2SGreg Kroah-Hartman /* 33ab4382d2SGreg Kroah-Hartman * This is used to lock changes in serial line configuration. 34ab4382d2SGreg Kroah-Hartman */ 35ab4382d2SGreg Kroah-Hartman static DEFINE_MUTEX(port_mutex); 36ab4382d2SGreg Kroah-Hartman 37ab4382d2SGreg Kroah-Hartman /* 38ab4382d2SGreg Kroah-Hartman * lockdep: port->lock is initialized in two places, but we 39ab4382d2SGreg Kroah-Hartman * want only one lock-class: 40ab4382d2SGreg Kroah-Hartman */ 41ab4382d2SGreg Kroah-Hartman static struct lock_class_key port_lock_key; 42ab4382d2SGreg Kroah-Hartman 43ab4382d2SGreg Kroah-Hartman #define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8) 44ab4382d2SGreg Kroah-Hartman 45ab4382d2SGreg Kroah-Hartman static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, 46ab4382d2SGreg Kroah-Hartman struct ktermios *old_termios); 471f33a51dSJiri Slaby static void uart_wait_until_sent(struct tty_struct *tty, int timeout); 486f538fe3SLinus Walleij static void uart_change_pm(struct uart_state *state, 496f538fe3SLinus Walleij enum uart_pm_state pm_state); 50ab4382d2SGreg Kroah-Hartman 51b922e19dSJiri Slaby static void uart_port_shutdown(struct tty_port *port); 52b922e19dSJiri Slaby 53299245a1SPeter Hurley static int uart_dcd_enabled(struct uart_port *uport) 54299245a1SPeter Hurley { 55d4260b51SPeter Hurley return !!(uport->status & UPSTAT_DCD_ENABLE); 56299245a1SPeter Hurley } 57299245a1SPeter Hurley 589ed19428SPeter Hurley static inline struct uart_port *uart_port_ref(struct uart_state *state) 599ed19428SPeter Hurley { 609ed19428SPeter Hurley if (atomic_add_unless(&state->refcount, 1, 0)) 619ed19428SPeter Hurley return state->uart_port; 629ed19428SPeter Hurley return NULL; 639ed19428SPeter Hurley } 649ed19428SPeter Hurley 659ed19428SPeter Hurley static inline void uart_port_deref(struct uart_port *uport) 669ed19428SPeter Hurley { 67ef510beaSAndy Shevchenko if (atomic_dec_and_test(&uport->state->refcount)) 689ed19428SPeter Hurley wake_up(&uport->state->remove_wait); 699ed19428SPeter Hurley } 709ed19428SPeter Hurley 719ed19428SPeter Hurley #define uart_port_lock(state, flags) \ 729ed19428SPeter Hurley ({ \ 739ed19428SPeter Hurley struct uart_port *__uport = uart_port_ref(state); \ 749ed19428SPeter Hurley if (__uport) \ 759ed19428SPeter Hurley spin_lock_irqsave(&__uport->lock, flags); \ 769ed19428SPeter Hurley __uport; \ 779ed19428SPeter Hurley }) 789ed19428SPeter Hurley 799ed19428SPeter Hurley #define uart_port_unlock(uport, flags) \ 809ed19428SPeter Hurley ({ \ 819ed19428SPeter Hurley struct uart_port *__uport = uport; \ 82ef510beaSAndy Shevchenko if (__uport) { \ 839ed19428SPeter Hurley spin_unlock_irqrestore(&__uport->lock, flags); \ 849ed19428SPeter Hurley uart_port_deref(__uport); \ 85ef510beaSAndy Shevchenko } \ 869ed19428SPeter Hurley }) 879ed19428SPeter Hurley 884047b371SPeter Hurley static inline struct uart_port *uart_port_check(struct uart_state *state) 894047b371SPeter Hurley { 907da4b8b7SPeter Hurley lockdep_assert_held(&state->port.mutex); 914047b371SPeter Hurley return state->uart_port; 924047b371SPeter Hurley } 934047b371SPeter Hurley 94ab4382d2SGreg Kroah-Hartman /* 95ab4382d2SGreg Kroah-Hartman * This routine is used by the interrupt handler to schedule processing in 96ab4382d2SGreg Kroah-Hartman * the software interrupt portion of the driver. 97ab4382d2SGreg Kroah-Hartman */ 98ab4382d2SGreg Kroah-Hartman void uart_write_wakeup(struct uart_port *port) 99ab4382d2SGreg Kroah-Hartman { 100ab4382d2SGreg Kroah-Hartman struct uart_state *state = port->state; 101ab4382d2SGreg Kroah-Hartman /* 102ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 103ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 104ab4382d2SGreg Kroah-Hartman */ 105ab4382d2SGreg Kroah-Hartman BUG_ON(!state); 106d0f4bce2SRob Herring tty_port_tty_wakeup(&state->port); 107ab4382d2SGreg Kroah-Hartman } 108ab4382d2SGreg Kroah-Hartman 109ab4382d2SGreg Kroah-Hartman static void uart_stop(struct tty_struct *tty) 110ab4382d2SGreg Kroah-Hartman { 111ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1129ed19428SPeter Hurley struct uart_port *port; 113ab4382d2SGreg Kroah-Hartman unsigned long flags; 114ab4382d2SGreg Kroah-Hartman 1159ed19428SPeter Hurley port = uart_port_lock(state, flags); 1169ed19428SPeter Hurley if (port) 117ab4382d2SGreg Kroah-Hartman port->ops->stop_tx(port); 1189ed19428SPeter Hurley uart_port_unlock(port, flags); 119ab4382d2SGreg Kroah-Hartman } 120ab4382d2SGreg Kroah-Hartman 121ab4382d2SGreg Kroah-Hartman static void __uart_start(struct tty_struct *tty) 122ab4382d2SGreg Kroah-Hartman { 123ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 124ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 125ab4382d2SGreg Kroah-Hartman 1269ed19428SPeter Hurley if (port && !uart_tx_stopped(port)) 127ab4382d2SGreg Kroah-Hartman port->ops->start_tx(port); 128ab4382d2SGreg Kroah-Hartman } 129ab4382d2SGreg Kroah-Hartman 130ab4382d2SGreg Kroah-Hartman static void uart_start(struct tty_struct *tty) 131ab4382d2SGreg Kroah-Hartman { 132ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1339ed19428SPeter Hurley struct uart_port *port; 134ab4382d2SGreg Kroah-Hartman unsigned long flags; 135ab4382d2SGreg Kroah-Hartman 1369ed19428SPeter Hurley port = uart_port_lock(state, flags); 137ab4382d2SGreg Kroah-Hartman __uart_start(tty); 1389ed19428SPeter Hurley uart_port_unlock(port, flags); 139ab4382d2SGreg Kroah-Hartman } 140ab4382d2SGreg Kroah-Hartman 141f4581cabSDenys Vlasenko static void 142ab4382d2SGreg Kroah-Hartman uart_update_mctrl(struct uart_port *port, unsigned int set, unsigned int clear) 143ab4382d2SGreg Kroah-Hartman { 144ab4382d2SGreg Kroah-Hartman unsigned long flags; 145ab4382d2SGreg Kroah-Hartman unsigned int old; 146ab4382d2SGreg Kroah-Hartman 147ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 148ab4382d2SGreg Kroah-Hartman old = port->mctrl; 149ab4382d2SGreg Kroah-Hartman port->mctrl = (old & ~clear) | set; 150ab4382d2SGreg Kroah-Hartman if (old != port->mctrl) 151ab4382d2SGreg Kroah-Hartman port->ops->set_mctrl(port, port->mctrl); 152ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 153ab4382d2SGreg Kroah-Hartman } 154ab4382d2SGreg Kroah-Hartman 155ab4382d2SGreg Kroah-Hartman #define uart_set_mctrl(port, set) uart_update_mctrl(port, set, 0) 156ab4382d2SGreg Kroah-Hartman #define uart_clear_mctrl(port, clear) uart_update_mctrl(port, 0, clear) 157ab4382d2SGreg Kroah-Hartman 158a6845e1eSRafael Gago static void uart_port_dtr_rts(struct uart_port *uport, int raise) 159a6845e1eSRafael Gago { 160a6845e1eSRafael Gago int rs485_on = uport->rs485_config && 161a6845e1eSRafael Gago (uport->rs485.flags & SER_RS485_ENABLED); 162a6845e1eSRafael Gago int RTS_after_send = !!(uport->rs485.flags & SER_RS485_RTS_AFTER_SEND); 163a6845e1eSRafael Gago 164a6845e1eSRafael Gago if (raise) { 165a6845e1eSRafael Gago if (rs485_on && !RTS_after_send) { 166a6845e1eSRafael Gago uart_set_mctrl(uport, TIOCM_DTR); 167a6845e1eSRafael Gago uart_clear_mctrl(uport, TIOCM_RTS); 168a6845e1eSRafael Gago } else { 169a6845e1eSRafael Gago uart_set_mctrl(uport, TIOCM_DTR | TIOCM_RTS); 170a6845e1eSRafael Gago } 171a6845e1eSRafael Gago } else { 172a6845e1eSRafael Gago unsigned int clear = TIOCM_DTR; 173a6845e1eSRafael Gago 174a6845e1eSRafael Gago clear |= (!rs485_on || !RTS_after_send) ? TIOCM_RTS : 0; 175a6845e1eSRafael Gago uart_clear_mctrl(uport, clear); 176a6845e1eSRafael Gago } 177a6845e1eSRafael Gago } 178a6845e1eSRafael Gago 179ab4382d2SGreg Kroah-Hartman /* 180ab4382d2SGreg Kroah-Hartman * Startup the port. This will be called once per open. All calls 181ab4382d2SGreg Kroah-Hartman * will be serialised by the per-port mutex. 182ab4382d2SGreg Kroah-Hartman */ 183c0d92be6SJiri Slaby static int uart_port_startup(struct tty_struct *tty, struct uart_state *state, 184c0d92be6SJiri Slaby int init_hw) 185ab4382d2SGreg Kroah-Hartman { 1864047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 18718ee37e1SJohan Hovold unsigned long flags; 188ab4382d2SGreg Kroah-Hartman unsigned long page; 189ab4382d2SGreg Kroah-Hartman int retval = 0; 190ab4382d2SGreg Kroah-Hartman 191ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) 192c0d92be6SJiri Slaby return 1; 193ab4382d2SGreg Kroah-Hartman 194ab4382d2SGreg Kroah-Hartman /* 1957deb39edSThomas Pfaff * Make sure the device is in D0 state. 1967deb39edSThomas Pfaff */ 1977deb39edSThomas Pfaff uart_change_pm(state, UART_PM_STATE_ON); 1987deb39edSThomas Pfaff 1997deb39edSThomas Pfaff /* 200ab4382d2SGreg Kroah-Hartman * Initialise and allocate the transmit and temporary 201ab4382d2SGreg Kroah-Hartman * buffer. 202ab4382d2SGreg Kroah-Hartman */ 203ab4382d2SGreg Kroah-Hartman page = get_zeroed_page(GFP_KERNEL); 204ab4382d2SGreg Kroah-Hartman if (!page) 205ab4382d2SGreg Kroah-Hartman return -ENOMEM; 206ab4382d2SGreg Kroah-Hartman 207a5ba1d95STycho Andersen uart_port_lock(state, flags); 208a5ba1d95STycho Andersen if (!state->xmit.buf) { 209ab4382d2SGreg Kroah-Hartman state->xmit.buf = (unsigned char *) page; 210ab4382d2SGreg Kroah-Hartman uart_circ_clear(&state->xmit); 211d7240214SSergey Senozhatsky uart_port_unlock(uport, flags); 212a5ba1d95STycho Andersen } else { 213d7240214SSergey Senozhatsky uart_port_unlock(uport, flags); 214d7240214SSergey Senozhatsky /* 215d7240214SSergey Senozhatsky * Do not free() the page under the port lock, see 216d7240214SSergey Senozhatsky * uart_shutdown(). 217d7240214SSergey Senozhatsky */ 218a5ba1d95STycho Andersen free_page(page); 219ab4382d2SGreg Kroah-Hartman } 220ab4382d2SGreg Kroah-Hartman 221ab4382d2SGreg Kroah-Hartman retval = uport->ops->startup(uport); 222ab4382d2SGreg Kroah-Hartman if (retval == 0) { 223c7d7abffSJiri Slaby if (uart_console(uport) && uport->cons->cflag) { 224adc8d746SAlan Cox tty->termios.c_cflag = uport->cons->cflag; 225027b5717SPali Rohár tty->termios.c_ispeed = uport->cons->ispeed; 226027b5717SPali Rohár tty->termios.c_ospeed = uport->cons->ospeed; 227c7d7abffSJiri Slaby uport->cons->cflag = 0; 228027b5717SPali Rohár uport->cons->ispeed = 0; 229027b5717SPali Rohár uport->cons->ospeed = 0; 230c7d7abffSJiri Slaby } 231ab4382d2SGreg Kroah-Hartman /* 232ab4382d2SGreg Kroah-Hartman * Initialise the hardware port settings. 233ab4382d2SGreg Kroah-Hartman */ 234ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 235ab4382d2SGreg Kroah-Hartman 236ab4382d2SGreg Kroah-Hartman /* 237ab4382d2SGreg Kroah-Hartman * Setup the RTS and DTR signals once the 238ab4382d2SGreg Kroah-Hartman * port is open and ready to respond. 239ab4382d2SGreg Kroah-Hartman */ 2409db276f8SPeter Hurley if (init_hw && C_BAUD(tty)) 241a6845e1eSRafael Gago uart_port_dtr_rts(uport, 1); 242ab4382d2SGreg Kroah-Hartman } 243ab4382d2SGreg Kroah-Hartman 2440055197eSJiri Slaby /* 2450055197eSJiri Slaby * This is to allow setserial on this port. People may want to set 2460055197eSJiri Slaby * port/irq/type and then reconfigure the port properly if it failed 2470055197eSJiri Slaby * now. 2480055197eSJiri Slaby */ 249ab4382d2SGreg Kroah-Hartman if (retval && capable(CAP_SYS_ADMIN)) 250c0d92be6SJiri Slaby return 1; 251c0d92be6SJiri Slaby 252c0d92be6SJiri Slaby return retval; 253c0d92be6SJiri Slaby } 254c0d92be6SJiri Slaby 255c0d92be6SJiri Slaby static int uart_startup(struct tty_struct *tty, struct uart_state *state, 256c0d92be6SJiri Slaby int init_hw) 257c0d92be6SJiri Slaby { 258c0d92be6SJiri Slaby struct tty_port *port = &state->port; 259c0d92be6SJiri Slaby int retval; 260c0d92be6SJiri Slaby 261d41861caSPeter Hurley if (tty_port_initialized(port)) 262c0d92be6SJiri Slaby return 0; 263c0d92be6SJiri Slaby 264c0d92be6SJiri Slaby retval = uart_port_startup(tty, state, init_hw); 265b3b57646SRob Herring if (retval) 266b3b57646SRob Herring set_bit(TTY_IO_ERROR, &tty->flags); 267ab4382d2SGreg Kroah-Hartman 268ab4382d2SGreg Kroah-Hartman return retval; 269ab4382d2SGreg Kroah-Hartman } 270ab4382d2SGreg Kroah-Hartman 271ab4382d2SGreg Kroah-Hartman /* 272ab4382d2SGreg Kroah-Hartman * This routine will shutdown a serial port; interrupts are disabled, and 273ab4382d2SGreg Kroah-Hartman * DTR is dropped if the hangup on close termio flag is on. Calls to 274ab4382d2SGreg Kroah-Hartman * uart_shutdown are serialised by the per-port semaphore. 275af224ca2SPeter Hurley * 276af224ca2SPeter Hurley * uport == NULL if uart_port has already been removed 277ab4382d2SGreg Kroah-Hartman */ 278ab4382d2SGreg Kroah-Hartman static void uart_shutdown(struct tty_struct *tty, struct uart_state *state) 279ab4382d2SGreg Kroah-Hartman { 2804047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 281ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 28218ee37e1SJohan Hovold unsigned long flags; 283d7240214SSergey Senozhatsky char *xmit_buf = NULL; 284ab4382d2SGreg Kroah-Hartman 285ab4382d2SGreg Kroah-Hartman /* 286ab4382d2SGreg Kroah-Hartman * Set the TTY IO error marker 287ab4382d2SGreg Kroah-Hartman */ 288ab4382d2SGreg Kroah-Hartman if (tty) 289ab4382d2SGreg Kroah-Hartman set_bit(TTY_IO_ERROR, &tty->flags); 290ab4382d2SGreg Kroah-Hartman 291d41861caSPeter Hurley if (tty_port_initialized(port)) { 292d41861caSPeter Hurley tty_port_set_initialized(port, 0); 293d41861caSPeter Hurley 294ab4382d2SGreg Kroah-Hartman /* 295ab4382d2SGreg Kroah-Hartman * Turn off DTR and RTS early. 296ab4382d2SGreg Kroah-Hartman */ 297027b5717SPali Rohár if (uport && uart_console(uport) && tty) { 298ae84db96SPeter Hurley uport->cons->cflag = tty->termios.c_cflag; 299027b5717SPali Rohár uport->cons->ispeed = tty->termios.c_ispeed; 300027b5717SPali Rohár uport->cons->ospeed = tty->termios.c_ospeed; 301027b5717SPali Rohár } 302ae84db96SPeter Hurley 3039db276f8SPeter Hurley if (!tty || C_HUPCL(tty)) 304a6845e1eSRafael Gago uart_port_dtr_rts(uport, 0); 305ab4382d2SGreg Kroah-Hartman 306b922e19dSJiri Slaby uart_port_shutdown(port); 307ab4382d2SGreg Kroah-Hartman } 308ab4382d2SGreg Kroah-Hartman 309ab4382d2SGreg Kroah-Hartman /* 310d208a3bfSDoug Anderson * It's possible for shutdown to be called after suspend if we get 311d208a3bfSDoug Anderson * a DCD drop (hangup) at just the right time. Clear suspended bit so 312d208a3bfSDoug Anderson * we don't try to resume a port that has been shutdown. 313ab4382d2SGreg Kroah-Hartman */ 31480f02d54SPeter Hurley tty_port_set_suspended(port, 0); 315ab4382d2SGreg Kroah-Hartman 316ab4382d2SGreg Kroah-Hartman /* 317d7240214SSergey Senozhatsky * Do not free() the transmit buffer page under the port lock since 318d7240214SSergey Senozhatsky * this can create various circular locking scenarios. For instance, 319d7240214SSergey Senozhatsky * console driver may need to allocate/free a debug object, which 320d7240214SSergey Senozhatsky * can endup in printk() recursion. 321ab4382d2SGreg Kroah-Hartman */ 322a5ba1d95STycho Andersen uart_port_lock(state, flags); 323d7240214SSergey Senozhatsky xmit_buf = state->xmit.buf; 324ab4382d2SGreg Kroah-Hartman state->xmit.buf = NULL; 325a5ba1d95STycho Andersen uart_port_unlock(uport, flags); 326d7240214SSergey Senozhatsky 327d7240214SSergey Senozhatsky if (xmit_buf) 328d7240214SSergey Senozhatsky free_page((unsigned long)xmit_buf); 329ab4382d2SGreg Kroah-Hartman } 330ab4382d2SGreg Kroah-Hartman 331ab4382d2SGreg Kroah-Hartman /** 332ab4382d2SGreg Kroah-Hartman * uart_update_timeout - update per-port FIFO timeout. 333ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port 334ab4382d2SGreg Kroah-Hartman * @cflag: termios cflag value 335ab4382d2SGreg Kroah-Hartman * @baud: speed of the port 336ab4382d2SGreg Kroah-Hartman * 337ab4382d2SGreg Kroah-Hartman * Set the port FIFO timeout value. The @cflag value should 338ab4382d2SGreg Kroah-Hartman * reflect the actual hardware settings. 339ab4382d2SGreg Kroah-Hartman */ 340ab4382d2SGreg Kroah-Hartman void 341ab4382d2SGreg Kroah-Hartman uart_update_timeout(struct uart_port *port, unsigned int cflag, 342ab4382d2SGreg Kroah-Hartman unsigned int baud) 343ab4382d2SGreg Kroah-Hartman { 344654ee49bSJiri Slaby unsigned int size; 345ab4382d2SGreg Kroah-Hartman 346654ee49bSJiri Slaby size = tty_get_frame_size(cflag) * port->fifosize; 347ab4382d2SGreg Kroah-Hartman 348ab4382d2SGreg Kroah-Hartman /* 349ab4382d2SGreg Kroah-Hartman * Figure the timeout to send the above number of bits. 350ab4382d2SGreg Kroah-Hartman * Add .02 seconds of slop 351ab4382d2SGreg Kroah-Hartman */ 352654ee49bSJiri Slaby port->timeout = (HZ * size) / baud + HZ/50; 353ab4382d2SGreg Kroah-Hartman } 354ab4382d2SGreg Kroah-Hartman 355ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_update_timeout); 356ab4382d2SGreg Kroah-Hartman 357ab4382d2SGreg Kroah-Hartman /** 358ab4382d2SGreg Kroah-Hartman * uart_get_baud_rate - return baud rate for a particular port 359ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port in question. 360ab4382d2SGreg Kroah-Hartman * @termios: desired termios settings. 361ab4382d2SGreg Kroah-Hartman * @old: old termios (or NULL) 362ab4382d2SGreg Kroah-Hartman * @min: minimum acceptable baud rate 363ab4382d2SGreg Kroah-Hartman * @max: maximum acceptable baud rate 364ab4382d2SGreg Kroah-Hartman * 365ab4382d2SGreg Kroah-Hartman * Decode the termios structure into a numeric baud rate, 366ab4382d2SGreg Kroah-Hartman * taking account of the magic 38400 baud rate (with spd_* 367ab4382d2SGreg Kroah-Hartman * flags), and mapping the %B0 rate to 9600 baud. 368ab4382d2SGreg Kroah-Hartman * 369ab4382d2SGreg Kroah-Hartman * If the new baud rate is invalid, try the old termios setting. 370ab4382d2SGreg Kroah-Hartman * If it's still invalid, we try 9600 baud. 371ab4382d2SGreg Kroah-Hartman * 372ab4382d2SGreg Kroah-Hartman * Update the @termios structure to reflect the baud rate 373ab4382d2SGreg Kroah-Hartman * we're actually going to be using. Don't do this for the case 374ab4382d2SGreg Kroah-Hartman * where B0 is requested ("hang up"). 375ab4382d2SGreg Kroah-Hartman */ 376ab4382d2SGreg Kroah-Hartman unsigned int 377ab4382d2SGreg Kroah-Hartman uart_get_baud_rate(struct uart_port *port, struct ktermios *termios, 378ab4382d2SGreg Kroah-Hartman struct ktermios *old, unsigned int min, unsigned int max) 379ab4382d2SGreg Kroah-Hartman { 380f10a2233SJoakim Nordell unsigned int try; 381f10a2233SJoakim Nordell unsigned int baud; 382f10a2233SJoakim Nordell unsigned int altbaud; 383ab4382d2SGreg Kroah-Hartman int hung_up = 0; 384ab4382d2SGreg Kroah-Hartman upf_t flags = port->flags & UPF_SPD_MASK; 385ab4382d2SGreg Kroah-Hartman 386f10a2233SJoakim Nordell switch (flags) { 387f10a2233SJoakim Nordell case UPF_SPD_HI: 388ab4382d2SGreg Kroah-Hartman altbaud = 57600; 389f10a2233SJoakim Nordell break; 390f10a2233SJoakim Nordell case UPF_SPD_VHI: 391ab4382d2SGreg Kroah-Hartman altbaud = 115200; 392f10a2233SJoakim Nordell break; 393f10a2233SJoakim Nordell case UPF_SPD_SHI: 394ab4382d2SGreg Kroah-Hartman altbaud = 230400; 395f10a2233SJoakim Nordell break; 396f10a2233SJoakim Nordell case UPF_SPD_WARP: 397ab4382d2SGreg Kroah-Hartman altbaud = 460800; 398f10a2233SJoakim Nordell break; 399f10a2233SJoakim Nordell default: 400f10a2233SJoakim Nordell altbaud = 38400; 401f10a2233SJoakim Nordell break; 402f10a2233SJoakim Nordell } 403ab4382d2SGreg Kroah-Hartman 404ab4382d2SGreg Kroah-Hartman for (try = 0; try < 2; try++) { 405ab4382d2SGreg Kroah-Hartman baud = tty_termios_baud_rate(termios); 406ab4382d2SGreg Kroah-Hartman 407ab4382d2SGreg Kroah-Hartman /* 408ab4382d2SGreg Kroah-Hartman * The spd_hi, spd_vhi, spd_shi, spd_warp kludge... 409ab4382d2SGreg Kroah-Hartman * Die! Die! Die! 410ab4382d2SGreg Kroah-Hartman */ 411547039ecSPeter Hurley if (try == 0 && baud == 38400) 412ab4382d2SGreg Kroah-Hartman baud = altbaud; 413ab4382d2SGreg Kroah-Hartman 414ab4382d2SGreg Kroah-Hartman /* 415ab4382d2SGreg Kroah-Hartman * Special case: B0 rate. 416ab4382d2SGreg Kroah-Hartman */ 417ab4382d2SGreg Kroah-Hartman if (baud == 0) { 418ab4382d2SGreg Kroah-Hartman hung_up = 1; 419ab4382d2SGreg Kroah-Hartman baud = 9600; 420ab4382d2SGreg Kroah-Hartman } 421ab4382d2SGreg Kroah-Hartman 422ab4382d2SGreg Kroah-Hartman if (baud >= min && baud <= max) 423ab4382d2SGreg Kroah-Hartman return baud; 424ab4382d2SGreg Kroah-Hartman 425ab4382d2SGreg Kroah-Hartman /* 426ab4382d2SGreg Kroah-Hartman * Oops, the quotient was zero. Try again with 427ab4382d2SGreg Kroah-Hartman * the old baud rate if possible. 428ab4382d2SGreg Kroah-Hartman */ 429ab4382d2SGreg Kroah-Hartman termios->c_cflag &= ~CBAUD; 430ab4382d2SGreg Kroah-Hartman if (old) { 431ab4382d2SGreg Kroah-Hartman baud = tty_termios_baud_rate(old); 432ab4382d2SGreg Kroah-Hartman if (!hung_up) 433ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 434ab4382d2SGreg Kroah-Hartman baud, baud); 435ab4382d2SGreg Kroah-Hartman old = NULL; 436ab4382d2SGreg Kroah-Hartman continue; 437ab4382d2SGreg Kroah-Hartman } 438ab4382d2SGreg Kroah-Hartman 439ab4382d2SGreg Kroah-Hartman /* 440ab4382d2SGreg Kroah-Hartman * As a last resort, if the range cannot be met then clip to 441ab4382d2SGreg Kroah-Hartman * the nearest chip supported rate. 442ab4382d2SGreg Kroah-Hartman */ 443ab4382d2SGreg Kroah-Hartman if (!hung_up) { 444ab4382d2SGreg Kroah-Hartman if (baud <= min) 445ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 446ab4382d2SGreg Kroah-Hartman min + 1, min + 1); 447ab4382d2SGreg Kroah-Hartman else 448ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 449ab4382d2SGreg Kroah-Hartman max - 1, max - 1); 450ab4382d2SGreg Kroah-Hartman } 451ab4382d2SGreg Kroah-Hartman } 452ab4382d2SGreg Kroah-Hartman /* Should never happen */ 453ab4382d2SGreg Kroah-Hartman WARN_ON(1); 454ab4382d2SGreg Kroah-Hartman return 0; 455ab4382d2SGreg Kroah-Hartman } 456ab4382d2SGreg Kroah-Hartman 457ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_get_baud_rate); 458ab4382d2SGreg Kroah-Hartman 459ab4382d2SGreg Kroah-Hartman /** 460ab4382d2SGreg Kroah-Hartman * uart_get_divisor - return uart clock divisor 461ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port. 462ab4382d2SGreg Kroah-Hartman * @baud: desired baud rate 463ab4382d2SGreg Kroah-Hartman * 464ab4382d2SGreg Kroah-Hartman * Calculate the uart clock divisor for the port. 465ab4382d2SGreg Kroah-Hartman */ 466ab4382d2SGreg Kroah-Hartman unsigned int 467ab4382d2SGreg Kroah-Hartman uart_get_divisor(struct uart_port *port, unsigned int baud) 468ab4382d2SGreg Kroah-Hartman { 469ab4382d2SGreg Kroah-Hartman unsigned int quot; 470ab4382d2SGreg Kroah-Hartman 471ab4382d2SGreg Kroah-Hartman /* 472ab4382d2SGreg Kroah-Hartman * Old custom speed handling. 473ab4382d2SGreg Kroah-Hartman */ 474ab4382d2SGreg Kroah-Hartman if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) 475ab4382d2SGreg Kroah-Hartman quot = port->custom_divisor; 476ab4382d2SGreg Kroah-Hartman else 47797d24634SUwe Kleine-König quot = DIV_ROUND_CLOSEST(port->uartclk, 16 * baud); 478ab4382d2SGreg Kroah-Hartman 479ab4382d2SGreg Kroah-Hartman return quot; 480ab4382d2SGreg Kroah-Hartman } 481ab4382d2SGreg Kroah-Hartman 482ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_get_divisor); 483ab4382d2SGreg Kroah-Hartman 4847c8ab967SPeter Hurley /* Caller holds port mutex */ 485ab4382d2SGreg Kroah-Hartman static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, 486ab4382d2SGreg Kroah-Hartman struct ktermios *old_termios) 487ab4382d2SGreg Kroah-Hartman { 4884047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 489ab4382d2SGreg Kroah-Hartman struct ktermios *termios; 490391f93f2SPeter Hurley int hw_stopped; 491ab4382d2SGreg Kroah-Hartman 492ab4382d2SGreg Kroah-Hartman /* 493ab4382d2SGreg Kroah-Hartman * If we have no tty, termios, or the port does not exist, 494ab4382d2SGreg Kroah-Hartman * then we can't set the parameters for this port. 495ab4382d2SGreg Kroah-Hartman */ 496adc8d746SAlan Cox if (!tty || uport->type == PORT_UNKNOWN) 497ab4382d2SGreg Kroah-Hartman return; 498ab4382d2SGreg Kroah-Hartman 499adc8d746SAlan Cox termios = &tty->termios; 500c18b55fdSPeter Hurley uport->ops->set_termios(uport, termios, old_termios); 501ab4382d2SGreg Kroah-Hartman 502ab4382d2SGreg Kroah-Hartman /* 503299245a1SPeter Hurley * Set modem status enables based on termios cflag 504ab4382d2SGreg Kroah-Hartman */ 505299245a1SPeter Hurley spin_lock_irq(&uport->lock); 506ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CRTSCTS) 507299245a1SPeter Hurley uport->status |= UPSTAT_CTS_ENABLE; 508ab4382d2SGreg Kroah-Hartman else 509299245a1SPeter Hurley uport->status &= ~UPSTAT_CTS_ENABLE; 510ab4382d2SGreg Kroah-Hartman 511ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CLOCAL) 512299245a1SPeter Hurley uport->status &= ~UPSTAT_DCD_ENABLE; 513ab4382d2SGreg Kroah-Hartman else 514299245a1SPeter Hurley uport->status |= UPSTAT_DCD_ENABLE; 515391f93f2SPeter Hurley 516391f93f2SPeter Hurley /* reset sw-assisted CTS flow control based on (possibly) new mode */ 517391f93f2SPeter Hurley hw_stopped = uport->hw_stopped; 518391f93f2SPeter Hurley uport->hw_stopped = uart_softcts_mode(uport) && 519391f93f2SPeter Hurley !(uport->ops->get_mctrl(uport) & TIOCM_CTS); 520391f93f2SPeter Hurley if (uport->hw_stopped) { 521391f93f2SPeter Hurley if (!hw_stopped) 522391f93f2SPeter Hurley uport->ops->stop_tx(uport); 523391f93f2SPeter Hurley } else { 524391f93f2SPeter Hurley if (hw_stopped) 525391f93f2SPeter Hurley __uart_start(tty); 526391f93f2SPeter Hurley } 527299245a1SPeter Hurley spin_unlock_irq(&uport->lock); 528ab4382d2SGreg Kroah-Hartman } 529ab4382d2SGreg Kroah-Hartman 530f5291eccSPeter Hurley static int uart_put_char(struct tty_struct *tty, unsigned char c) 531ab4382d2SGreg Kroah-Hartman { 532f5291eccSPeter Hurley struct uart_state *state = tty->driver_data; 5339ed19428SPeter Hurley struct uart_port *port; 534f5291eccSPeter Hurley struct circ_buf *circ; 535ab4382d2SGreg Kroah-Hartman unsigned long flags; 536ab4382d2SGreg Kroah-Hartman int ret = 0; 537ab4382d2SGreg Kroah-Hartman 538f5291eccSPeter Hurley circ = &state->xmit; 5399ed19428SPeter Hurley port = uart_port_lock(state, flags); 540aff9cf59SSamir Virmani if (!circ->buf) { 541aff9cf59SSamir Virmani uart_port_unlock(port, flags); 542aff9cf59SSamir Virmani return 0; 543aff9cf59SSamir Virmani } 544aff9cf59SSamir Virmani 5459ed19428SPeter Hurley if (port && uart_circ_chars_free(circ) != 0) { 546ab4382d2SGreg Kroah-Hartman circ->buf[circ->head] = c; 547ab4382d2SGreg Kroah-Hartman circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1); 548ab4382d2SGreg Kroah-Hartman ret = 1; 549ab4382d2SGreg Kroah-Hartman } 5509ed19428SPeter Hurley uart_port_unlock(port, flags); 551ab4382d2SGreg Kroah-Hartman return ret; 552ab4382d2SGreg Kroah-Hartman } 553ab4382d2SGreg Kroah-Hartman 554ab4382d2SGreg Kroah-Hartman static void uart_flush_chars(struct tty_struct *tty) 555ab4382d2SGreg Kroah-Hartman { 556ab4382d2SGreg Kroah-Hartman uart_start(tty); 557ab4382d2SGreg Kroah-Hartman } 558ab4382d2SGreg Kroah-Hartman 559ab4382d2SGreg Kroah-Hartman static int uart_write(struct tty_struct *tty, 560ab4382d2SGreg Kroah-Hartman const unsigned char *buf, int count) 561ab4382d2SGreg Kroah-Hartman { 562ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 563ab4382d2SGreg Kroah-Hartman struct uart_port *port; 564ab4382d2SGreg Kroah-Hartman struct circ_buf *circ; 565ab4382d2SGreg Kroah-Hartman unsigned long flags; 566ab4382d2SGreg Kroah-Hartman int c, ret = 0; 567ab4382d2SGreg Kroah-Hartman 568ab4382d2SGreg Kroah-Hartman /* 569ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 570ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 571ab4382d2SGreg Kroah-Hartman */ 572ab4382d2SGreg Kroah-Hartman if (!state) { 573ab4382d2SGreg Kroah-Hartman WARN_ON(1); 574ab4382d2SGreg Kroah-Hartman return -EL3HLT; 575ab4382d2SGreg Kroah-Hartman } 576ab4382d2SGreg Kroah-Hartman 5779ed19428SPeter Hurley port = uart_port_lock(state, flags); 578aff9cf59SSamir Virmani circ = &state->xmit; 579aff9cf59SSamir Virmani if (!circ->buf) { 580aff9cf59SSamir Virmani uart_port_unlock(port, flags); 581aff9cf59SSamir Virmani return 0; 582aff9cf59SSamir Virmani } 583aff9cf59SSamir Virmani 5849ed19428SPeter Hurley while (port) { 585ab4382d2SGreg Kroah-Hartman c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE); 586ab4382d2SGreg Kroah-Hartman if (count < c) 587ab4382d2SGreg Kroah-Hartman c = count; 588ab4382d2SGreg Kroah-Hartman if (c <= 0) 589ab4382d2SGreg Kroah-Hartman break; 590ab4382d2SGreg Kroah-Hartman memcpy(circ->buf + circ->head, buf, c); 591ab4382d2SGreg Kroah-Hartman circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1); 592ab4382d2SGreg Kroah-Hartman buf += c; 593ab4382d2SGreg Kroah-Hartman count -= c; 594ab4382d2SGreg Kroah-Hartman ret += c; 595ab4382d2SGreg Kroah-Hartman } 59664dbee31SPeter Hurley 59764dbee31SPeter Hurley __uart_start(tty); 5989ed19428SPeter Hurley uart_port_unlock(port, flags); 599ab4382d2SGreg Kroah-Hartman return ret; 600ab4382d2SGreg Kroah-Hartman } 601ab4382d2SGreg Kroah-Hartman 60203b3b1a2SJiri Slaby static unsigned int uart_write_room(struct tty_struct *tty) 603ab4382d2SGreg Kroah-Hartman { 604ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 6059ed19428SPeter Hurley struct uart_port *port; 606ab4382d2SGreg Kroah-Hartman unsigned long flags; 60703b3b1a2SJiri Slaby unsigned int ret; 608ab4382d2SGreg Kroah-Hartman 6099ed19428SPeter Hurley port = uart_port_lock(state, flags); 610ab4382d2SGreg Kroah-Hartman ret = uart_circ_chars_free(&state->xmit); 6119ed19428SPeter Hurley uart_port_unlock(port, flags); 612ab4382d2SGreg Kroah-Hartman return ret; 613ab4382d2SGreg Kroah-Hartman } 614ab4382d2SGreg Kroah-Hartman 615fff4ef17SJiri Slaby static unsigned int uart_chars_in_buffer(struct tty_struct *tty) 616ab4382d2SGreg Kroah-Hartman { 617ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 6189ed19428SPeter Hurley struct uart_port *port; 619ab4382d2SGreg Kroah-Hartman unsigned long flags; 620fff4ef17SJiri Slaby unsigned int ret; 621ab4382d2SGreg Kroah-Hartman 6229ed19428SPeter Hurley port = uart_port_lock(state, flags); 623ab4382d2SGreg Kroah-Hartman ret = uart_circ_chars_pending(&state->xmit); 6249ed19428SPeter Hurley uart_port_unlock(port, flags); 625ab4382d2SGreg Kroah-Hartman return ret; 626ab4382d2SGreg Kroah-Hartman } 627ab4382d2SGreg Kroah-Hartman 628ab4382d2SGreg Kroah-Hartman static void uart_flush_buffer(struct tty_struct *tty) 629ab4382d2SGreg Kroah-Hartman { 630ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 631ab4382d2SGreg Kroah-Hartman struct uart_port *port; 632ab4382d2SGreg Kroah-Hartman unsigned long flags; 633ab4382d2SGreg Kroah-Hartman 634ab4382d2SGreg Kroah-Hartman /* 635ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 636ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 637ab4382d2SGreg Kroah-Hartman */ 638ab4382d2SGreg Kroah-Hartman if (!state) { 639ab4382d2SGreg Kroah-Hartman WARN_ON(1); 640ab4382d2SGreg Kroah-Hartman return; 641ab4382d2SGreg Kroah-Hartman } 642ab4382d2SGreg Kroah-Hartman 643ab4382d2SGreg Kroah-Hartman pr_debug("uart_flush_buffer(%d) called\n", tty->index); 644ab4382d2SGreg Kroah-Hartman 6459ed19428SPeter Hurley port = uart_port_lock(state, flags); 6469ed19428SPeter Hurley if (!port) 6479ed19428SPeter Hurley return; 648ab4382d2SGreg Kroah-Hartman uart_circ_clear(&state->xmit); 649ab4382d2SGreg Kroah-Hartman if (port->ops->flush_buffer) 650ab4382d2SGreg Kroah-Hartman port->ops->flush_buffer(port); 6519ed19428SPeter Hurley uart_port_unlock(port, flags); 652d0f4bce2SRob Herring tty_port_tty_wakeup(&state->port); 653ab4382d2SGreg Kroah-Hartman } 654ab4382d2SGreg Kroah-Hartman 655ab4382d2SGreg Kroah-Hartman /* 656ab4382d2SGreg Kroah-Hartman * This function is used to send a high-priority XON/XOFF character to 657ab4382d2SGreg Kroah-Hartman * the device 658ab4382d2SGreg Kroah-Hartman */ 659ab4382d2SGreg Kroah-Hartman static void uart_send_xchar(struct tty_struct *tty, char ch) 660ab4382d2SGreg Kroah-Hartman { 661ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 6629ed19428SPeter Hurley struct uart_port *port; 663ab4382d2SGreg Kroah-Hartman unsigned long flags; 664ab4382d2SGreg Kroah-Hartman 6659ed19428SPeter Hurley port = uart_port_ref(state); 6669ed19428SPeter Hurley if (!port) 6679ed19428SPeter Hurley return; 6689ed19428SPeter Hurley 669ab4382d2SGreg Kroah-Hartman if (port->ops->send_xchar) 670ab4382d2SGreg Kroah-Hartman port->ops->send_xchar(port, ch); 671ab4382d2SGreg Kroah-Hartman else { 672ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 673c235ccc1SPeter Hurley port->x_char = ch; 674c235ccc1SPeter Hurley if (ch) 675ab4382d2SGreg Kroah-Hartman port->ops->start_tx(port); 676ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 677ab4382d2SGreg Kroah-Hartman } 6789ed19428SPeter Hurley uart_port_deref(port); 679ab4382d2SGreg Kroah-Hartman } 680ab4382d2SGreg Kroah-Hartman 681ab4382d2SGreg Kroah-Hartman static void uart_throttle(struct tty_struct *tty) 682ab4382d2SGreg Kroah-Hartman { 683ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 684c5f78b1fSJeremy Kerr upstat_t mask = UPSTAT_SYNC_FIFO; 6859ed19428SPeter Hurley struct uart_port *port; 686ab4382d2SGreg Kroah-Hartman 6879ed19428SPeter Hurley port = uart_port_ref(state); 6889ed19428SPeter Hurley if (!port) 6899ed19428SPeter Hurley return; 6909ed19428SPeter Hurley 691ab4382d2SGreg Kroah-Hartman if (I_IXOFF(tty)) 692391f93f2SPeter Hurley mask |= UPSTAT_AUTOXOFF; 6939db276f8SPeter Hurley if (C_CRTSCTS(tty)) 694391f93f2SPeter Hurley mask |= UPSTAT_AUTORTS; 6959aba8d5bSRussell King 696391f93f2SPeter Hurley if (port->status & mask) { 6979aba8d5bSRussell King port->ops->throttle(port); 698391f93f2SPeter Hurley mask &= ~port->status; 6999aba8d5bSRussell King } 7009aba8d5bSRussell King 701391f93f2SPeter Hurley if (mask & UPSTAT_AUTORTS) 7029aba8d5bSRussell King uart_clear_mctrl(port, TIOCM_RTS); 703b4749b97SPeter Hurley 704b4749b97SPeter Hurley if (mask & UPSTAT_AUTOXOFF) 705b4749b97SPeter Hurley uart_send_xchar(tty, STOP_CHAR(tty)); 7069ed19428SPeter Hurley 7079ed19428SPeter Hurley uart_port_deref(port); 708ab4382d2SGreg Kroah-Hartman } 709ab4382d2SGreg Kroah-Hartman 710ab4382d2SGreg Kroah-Hartman static void uart_unthrottle(struct tty_struct *tty) 711ab4382d2SGreg Kroah-Hartman { 712ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 713c5f78b1fSJeremy Kerr upstat_t mask = UPSTAT_SYNC_FIFO; 7149ed19428SPeter Hurley struct uart_port *port; 715ab4382d2SGreg Kroah-Hartman 7169ed19428SPeter Hurley port = uart_port_ref(state); 7179ed19428SPeter Hurley if (!port) 7189ed19428SPeter Hurley return; 7199ed19428SPeter Hurley 7209aba8d5bSRussell King if (I_IXOFF(tty)) 721391f93f2SPeter Hurley mask |= UPSTAT_AUTOXOFF; 7229db276f8SPeter Hurley if (C_CRTSCTS(tty)) 723391f93f2SPeter Hurley mask |= UPSTAT_AUTORTS; 7249aba8d5bSRussell King 725391f93f2SPeter Hurley if (port->status & mask) { 7269aba8d5bSRussell King port->ops->unthrottle(port); 727391f93f2SPeter Hurley mask &= ~port->status; 7289aba8d5bSRussell King } 7299aba8d5bSRussell King 730391f93f2SPeter Hurley if (mask & UPSTAT_AUTORTS) 731ab4382d2SGreg Kroah-Hartman uart_set_mctrl(port, TIOCM_RTS); 732b4749b97SPeter Hurley 733b4749b97SPeter Hurley if (mask & UPSTAT_AUTOXOFF) 734b4749b97SPeter Hurley uart_send_xchar(tty, START_CHAR(tty)); 7359ed19428SPeter Hurley 7369ed19428SPeter Hurley uart_port_deref(port); 737ab4382d2SGreg Kroah-Hartman } 738ab4382d2SGreg Kroah-Hartman 7394047b371SPeter Hurley static int uart_get_info(struct tty_port *port, struct serial_struct *retinfo) 740ab4382d2SGreg Kroah-Hartman { 7419f109694SAlan Cox struct uart_state *state = container_of(port, struct uart_state, port); 7424047b371SPeter Hurley struct uart_port *uport; 7434047b371SPeter Hurley int ret = -ENODEV; 7447ba2e769SAlan Cox 7453abe8c76SPeter Hurley /* 7463abe8c76SPeter Hurley * Ensure the state we copy is consistent and no hardware changes 7473abe8c76SPeter Hurley * occur as we go 7483abe8c76SPeter Hurley */ 7493abe8c76SPeter Hurley mutex_lock(&port->mutex); 7504047b371SPeter Hurley uport = uart_port_check(state); 7514047b371SPeter Hurley if (!uport) 7524047b371SPeter Hurley goto out; 7534047b371SPeter Hurley 7547ba2e769SAlan Cox retinfo->type = uport->type; 7557ba2e769SAlan Cox retinfo->line = uport->line; 7567ba2e769SAlan Cox retinfo->port = uport->iobase; 7577ba2e769SAlan Cox if (HIGH_BITS_OFFSET) 7587ba2e769SAlan Cox retinfo->port_high = (long) uport->iobase >> HIGH_BITS_OFFSET; 7597ba2e769SAlan Cox retinfo->irq = uport->irq; 760a17e74c5SAndy Shevchenko retinfo->flags = (__force int)uport->flags; 7617ba2e769SAlan Cox retinfo->xmit_fifo_size = uport->fifosize; 7627ba2e769SAlan Cox retinfo->baud_base = uport->uartclk / 16; 7637ba2e769SAlan Cox retinfo->close_delay = jiffies_to_msecs(port->close_delay) / 10; 7647ba2e769SAlan Cox retinfo->closing_wait = port->closing_wait == ASYNC_CLOSING_WAIT_NONE ? 7657ba2e769SAlan Cox ASYNC_CLOSING_WAIT_NONE : 7667ba2e769SAlan Cox jiffies_to_msecs(port->closing_wait) / 10; 7677ba2e769SAlan Cox retinfo->custom_divisor = uport->custom_divisor; 7687ba2e769SAlan Cox retinfo->hub6 = uport->hub6; 7697ba2e769SAlan Cox retinfo->io_type = uport->iotype; 7707ba2e769SAlan Cox retinfo->iomem_reg_shift = uport->regshift; 7717ba2e769SAlan Cox retinfo->iomem_base = (void *)(unsigned long)uport->mapbase; 7724047b371SPeter Hurley 7734047b371SPeter Hurley ret = 0; 7744047b371SPeter Hurley out: 775ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 7764047b371SPeter Hurley return ret; 7779f109694SAlan Cox } 7789f109694SAlan Cox 7795099d234SAl Viro static int uart_get_info_user(struct tty_struct *tty, 7805099d234SAl Viro struct serial_struct *ss) 7819f109694SAlan Cox { 7825099d234SAl Viro struct uart_state *state = tty->driver_data; 7835099d234SAl Viro struct tty_port *port = &state->port; 7843abe8c76SPeter Hurley 7855099d234SAl Viro return uart_get_info(port, ss) < 0 ? -EIO : 0; 786ab4382d2SGreg Kroah-Hartman } 787ab4382d2SGreg Kroah-Hartman 7887ba2e769SAlan Cox static int uart_set_info(struct tty_struct *tty, struct tty_port *port, 7897ba2e769SAlan Cox struct uart_state *state, 7907ba2e769SAlan Cox struct serial_struct *new_info) 791ab4382d2SGreg Kroah-Hartman { 7924047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 793ab4382d2SGreg Kroah-Hartman unsigned long new_port; 794ab4382d2SGreg Kroah-Hartman unsigned int change_irq, change_port, closing_wait; 795ab4382d2SGreg Kroah-Hartman unsigned int old_custom_divisor, close_delay; 796ab4382d2SGreg Kroah-Hartman upf_t old_flags, new_flags; 797ab4382d2SGreg Kroah-Hartman int retval = 0; 798ab4382d2SGreg Kroah-Hartman 7994047b371SPeter Hurley if (!uport) 8004047b371SPeter Hurley return -EIO; 8014047b371SPeter Hurley 8027ba2e769SAlan Cox new_port = new_info->port; 803ab4382d2SGreg Kroah-Hartman if (HIGH_BITS_OFFSET) 8047ba2e769SAlan Cox new_port += (unsigned long) new_info->port_high << HIGH_BITS_OFFSET; 805ab4382d2SGreg Kroah-Hartman 8067ba2e769SAlan Cox new_info->irq = irq_canonicalize(new_info->irq); 8077ba2e769SAlan Cox close_delay = msecs_to_jiffies(new_info->close_delay * 10); 8087ba2e769SAlan Cox closing_wait = new_info->closing_wait == ASYNC_CLOSING_WAIT_NONE ? 8094cb0fbfdSJiri Slaby ASYNC_CLOSING_WAIT_NONE : 8107ba2e769SAlan Cox msecs_to_jiffies(new_info->closing_wait * 10); 811ab4382d2SGreg Kroah-Hartman 812ab4382d2SGreg Kroah-Hartman 813ab4382d2SGreg Kroah-Hartman change_irq = !(uport->flags & UPF_FIXED_PORT) 8147ba2e769SAlan Cox && new_info->irq != uport->irq; 815ab4382d2SGreg Kroah-Hartman 816ab4382d2SGreg Kroah-Hartman /* 817ab4382d2SGreg Kroah-Hartman * Since changing the 'type' of the port changes its resource 818ab4382d2SGreg Kroah-Hartman * allocations, we should treat type changes the same as 819ab4382d2SGreg Kroah-Hartman * IO port changes. 820ab4382d2SGreg Kroah-Hartman */ 821ab4382d2SGreg Kroah-Hartman change_port = !(uport->flags & UPF_FIXED_PORT) 822ab4382d2SGreg Kroah-Hartman && (new_port != uport->iobase || 8237ba2e769SAlan Cox (unsigned long)new_info->iomem_base != uport->mapbase || 8247ba2e769SAlan Cox new_info->hub6 != uport->hub6 || 8257ba2e769SAlan Cox new_info->io_type != uport->iotype || 8267ba2e769SAlan Cox new_info->iomem_reg_shift != uport->regshift || 8277ba2e769SAlan Cox new_info->type != uport->type); 828ab4382d2SGreg Kroah-Hartman 829ab4382d2SGreg Kroah-Hartman old_flags = uport->flags; 830a17e74c5SAndy Shevchenko new_flags = (__force upf_t)new_info->flags; 831ab4382d2SGreg Kroah-Hartman old_custom_divisor = uport->custom_divisor; 832ab4382d2SGreg Kroah-Hartman 833ab4382d2SGreg Kroah-Hartman if (!capable(CAP_SYS_ADMIN)) { 834ab4382d2SGreg Kroah-Hartman retval = -EPERM; 835ab4382d2SGreg Kroah-Hartman if (change_irq || change_port || 8367ba2e769SAlan Cox (new_info->baud_base != uport->uartclk / 16) || 837ab4382d2SGreg Kroah-Hartman (close_delay != port->close_delay) || 838ab4382d2SGreg Kroah-Hartman (closing_wait != port->closing_wait) || 8397ba2e769SAlan Cox (new_info->xmit_fifo_size && 8407ba2e769SAlan Cox new_info->xmit_fifo_size != uport->fifosize) || 841ab4382d2SGreg Kroah-Hartman (((new_flags ^ old_flags) & ~UPF_USR_MASK) != 0)) 842ab4382d2SGreg Kroah-Hartman goto exit; 843ab4382d2SGreg Kroah-Hartman uport->flags = ((uport->flags & ~UPF_USR_MASK) | 844ab4382d2SGreg Kroah-Hartman (new_flags & UPF_USR_MASK)); 8457ba2e769SAlan Cox uport->custom_divisor = new_info->custom_divisor; 846ab4382d2SGreg Kroah-Hartman goto check_and_exit; 847ab4382d2SGreg Kroah-Hartman } 848ab4382d2SGreg Kroah-Hartman 8495e722b21SOndrej Mosnacek if (change_irq || change_port) { 850794edf30SDavid Howells retval = security_locked_down(LOCKDOWN_TIOCSSERIAL); 8515e722b21SOndrej Mosnacek if (retval) 852794edf30SDavid Howells goto exit; 8535e722b21SOndrej Mosnacek } 854794edf30SDavid Howells 855ab4382d2SGreg Kroah-Hartman /* 856ab4382d2SGreg Kroah-Hartman * Ask the low level driver to verify the settings. 857ab4382d2SGreg Kroah-Hartman */ 858ab4382d2SGreg Kroah-Hartman if (uport->ops->verify_port) 8597ba2e769SAlan Cox retval = uport->ops->verify_port(uport, new_info); 860ab4382d2SGreg Kroah-Hartman 8617ba2e769SAlan Cox if ((new_info->irq >= nr_irqs) || (new_info->irq < 0) || 8627ba2e769SAlan Cox (new_info->baud_base < 9600)) 863ab4382d2SGreg Kroah-Hartman retval = -EINVAL; 864ab4382d2SGreg Kroah-Hartman 865ab4382d2SGreg Kroah-Hartman if (retval) 866ab4382d2SGreg Kroah-Hartman goto exit; 867ab4382d2SGreg Kroah-Hartman 868ab4382d2SGreg Kroah-Hartman if (change_port || change_irq) { 869ab4382d2SGreg Kroah-Hartman retval = -EBUSY; 870ab4382d2SGreg Kroah-Hartman 871ab4382d2SGreg Kroah-Hartman /* 872ab4382d2SGreg Kroah-Hartman * Make sure that we are the sole user of this port. 873ab4382d2SGreg Kroah-Hartman */ 874ab4382d2SGreg Kroah-Hartman if (tty_port_users(port) > 1) 875ab4382d2SGreg Kroah-Hartman goto exit; 876ab4382d2SGreg Kroah-Hartman 877ab4382d2SGreg Kroah-Hartman /* 878ab4382d2SGreg Kroah-Hartman * We need to shutdown the serial port at the old 879ab4382d2SGreg Kroah-Hartman * port/type/irq combination. 880ab4382d2SGreg Kroah-Hartman */ 881ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 882ab4382d2SGreg Kroah-Hartman } 883ab4382d2SGreg Kroah-Hartman 884ab4382d2SGreg Kroah-Hartman if (change_port) { 885ab4382d2SGreg Kroah-Hartman unsigned long old_iobase, old_mapbase; 886ab4382d2SGreg Kroah-Hartman unsigned int old_type, old_iotype, old_hub6, old_shift; 887ab4382d2SGreg Kroah-Hartman 888ab4382d2SGreg Kroah-Hartman old_iobase = uport->iobase; 889ab4382d2SGreg Kroah-Hartman old_mapbase = uport->mapbase; 890ab4382d2SGreg Kroah-Hartman old_type = uport->type; 891ab4382d2SGreg Kroah-Hartman old_hub6 = uport->hub6; 892ab4382d2SGreg Kroah-Hartman old_iotype = uport->iotype; 893ab4382d2SGreg Kroah-Hartman old_shift = uport->regshift; 894ab4382d2SGreg Kroah-Hartman 895ab4382d2SGreg Kroah-Hartman /* 896ab4382d2SGreg Kroah-Hartman * Free and release old regions 897ab4382d2SGreg Kroah-Hartman */ 898a7cfaf16SFabio Estevam if (old_type != PORT_UNKNOWN && uport->ops->release_port) 899ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 900ab4382d2SGreg Kroah-Hartman 901ab4382d2SGreg Kroah-Hartman uport->iobase = new_port; 9027ba2e769SAlan Cox uport->type = new_info->type; 9037ba2e769SAlan Cox uport->hub6 = new_info->hub6; 9047ba2e769SAlan Cox uport->iotype = new_info->io_type; 9057ba2e769SAlan Cox uport->regshift = new_info->iomem_reg_shift; 9067ba2e769SAlan Cox uport->mapbase = (unsigned long)new_info->iomem_base; 907ab4382d2SGreg Kroah-Hartman 908ab4382d2SGreg Kroah-Hartman /* 909ab4382d2SGreg Kroah-Hartman * Claim and map the new regions 910ab4382d2SGreg Kroah-Hartman */ 911a7cfaf16SFabio Estevam if (uport->type != PORT_UNKNOWN && uport->ops->request_port) { 912ab4382d2SGreg Kroah-Hartman retval = uport->ops->request_port(uport); 913ab4382d2SGreg Kroah-Hartman } else { 914ab4382d2SGreg Kroah-Hartman /* Always success - Jean II */ 915ab4382d2SGreg Kroah-Hartman retval = 0; 916ab4382d2SGreg Kroah-Hartman } 917ab4382d2SGreg Kroah-Hartman 918ab4382d2SGreg Kroah-Hartman /* 919ab4382d2SGreg Kroah-Hartman * If we fail to request resources for the 920ab4382d2SGreg Kroah-Hartman * new port, try to restore the old settings. 921ab4382d2SGreg Kroah-Hartman */ 9227deb39edSThomas Pfaff if (retval) { 923ab4382d2SGreg Kroah-Hartman uport->iobase = old_iobase; 924ab4382d2SGreg Kroah-Hartman uport->type = old_type; 925ab4382d2SGreg Kroah-Hartman uport->hub6 = old_hub6; 926ab4382d2SGreg Kroah-Hartman uport->iotype = old_iotype; 927ab4382d2SGreg Kroah-Hartman uport->regshift = old_shift; 928ab4382d2SGreg Kroah-Hartman uport->mapbase = old_mapbase; 9297deb39edSThomas Pfaff 9307deb39edSThomas Pfaff if (old_type != PORT_UNKNOWN) { 931ab4382d2SGreg Kroah-Hartman retval = uport->ops->request_port(uport); 932ab4382d2SGreg Kroah-Hartman /* 933ab4382d2SGreg Kroah-Hartman * If we failed to restore the old settings, 934ab4382d2SGreg Kroah-Hartman * we fail like this. 935ab4382d2SGreg Kroah-Hartman */ 936ab4382d2SGreg Kroah-Hartman if (retval) 937ab4382d2SGreg Kroah-Hartman uport->type = PORT_UNKNOWN; 938ab4382d2SGreg Kroah-Hartman 939ab4382d2SGreg Kroah-Hartman /* 940ab4382d2SGreg Kroah-Hartman * We failed anyway. 941ab4382d2SGreg Kroah-Hartman */ 942ab4382d2SGreg Kroah-Hartman retval = -EBUSY; 9437deb39edSThomas Pfaff } 9447deb39edSThomas Pfaff 945ab4382d2SGreg Kroah-Hartman /* Added to return the correct error -Ram Gupta */ 946ab4382d2SGreg Kroah-Hartman goto exit; 947ab4382d2SGreg Kroah-Hartman } 948ab4382d2SGreg Kroah-Hartman } 949ab4382d2SGreg Kroah-Hartman 950ab4382d2SGreg Kroah-Hartman if (change_irq) 9517ba2e769SAlan Cox uport->irq = new_info->irq; 952ab4382d2SGreg Kroah-Hartman if (!(uport->flags & UPF_FIXED_PORT)) 9537ba2e769SAlan Cox uport->uartclk = new_info->baud_base * 16; 954ab4382d2SGreg Kroah-Hartman uport->flags = (uport->flags & ~UPF_CHANGE_MASK) | 955ab4382d2SGreg Kroah-Hartman (new_flags & UPF_CHANGE_MASK); 9567ba2e769SAlan Cox uport->custom_divisor = new_info->custom_divisor; 957ab4382d2SGreg Kroah-Hartman port->close_delay = close_delay; 958ab4382d2SGreg Kroah-Hartman port->closing_wait = closing_wait; 9597ba2e769SAlan Cox if (new_info->xmit_fifo_size) 9607ba2e769SAlan Cox uport->fifosize = new_info->xmit_fifo_size; 961ab4382d2SGreg Kroah-Hartman 962ab4382d2SGreg Kroah-Hartman check_and_exit: 963ab4382d2SGreg Kroah-Hartman retval = 0; 964ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) 965ab4382d2SGreg Kroah-Hartman goto exit; 966d41861caSPeter Hurley if (tty_port_initialized(port)) { 967ab4382d2SGreg Kroah-Hartman if (((old_flags ^ uport->flags) & UPF_SPD_MASK) || 968ab4382d2SGreg Kroah-Hartman old_custom_divisor != uport->custom_divisor) { 969ab4382d2SGreg Kroah-Hartman /* 970ab4382d2SGreg Kroah-Hartman * If they're setting up a custom divisor or speed, 971dc2f7271SJohan Hovold * instead of clearing it, then bitch about it. 972ab4382d2SGreg Kroah-Hartman */ 973ab4382d2SGreg Kroah-Hartman if (uport->flags & UPF_SPD_MASK) { 974dc2f7271SJohan Hovold dev_notice_ratelimited(uport->dev, 9752f2dafe7SSudip Mukherjee "%s sets custom speed on %s. This is deprecated.\n", 9762f2dafe7SSudip Mukherjee current->comm, 977429b4749SRasmus Villemoes tty_name(port->tty)); 978ab4382d2SGreg Kroah-Hartman } 979ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 980ab4382d2SGreg Kroah-Hartman } 981b3b57646SRob Herring } else { 982ab4382d2SGreg Kroah-Hartman retval = uart_startup(tty, state, 1); 98344117a1dSSebastian Andrzej Siewior if (retval == 0) 98444117a1dSSebastian Andrzej Siewior tty_port_set_initialized(port, true); 985b3b57646SRob Herring if (retval > 0) 986b3b57646SRob Herring retval = 0; 987b3b57646SRob Herring } 988ab4382d2SGreg Kroah-Hartman exit: 9897ba2e769SAlan Cox return retval; 9907ba2e769SAlan Cox } 9917ba2e769SAlan Cox 9925099d234SAl Viro static int uart_set_info_user(struct tty_struct *tty, struct serial_struct *ss) 9937ba2e769SAlan Cox { 9945099d234SAl Viro struct uart_state *state = tty->driver_data; 9957ba2e769SAlan Cox struct tty_port *port = &state->port; 9967ba2e769SAlan Cox int retval; 9977ba2e769SAlan Cox 9985099d234SAl Viro down_write(&tty->termios_rwsem); 9997ba2e769SAlan Cox /* 10007ba2e769SAlan Cox * This semaphore protects port->count. It is also 10017ba2e769SAlan Cox * very useful to prevent opens. Also, take the 10027ba2e769SAlan Cox * port configuration semaphore to make sure that a 10037ba2e769SAlan Cox * module insertion/removal doesn't change anything 10047ba2e769SAlan Cox * under us. 10057ba2e769SAlan Cox */ 10067ba2e769SAlan Cox mutex_lock(&port->mutex); 10075099d234SAl Viro retval = uart_set_info(tty, port, state, ss); 1008ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 10095099d234SAl Viro up_write(&tty->termios_rwsem); 1010ab4382d2SGreg Kroah-Hartman return retval; 1011ab4382d2SGreg Kroah-Hartman } 1012ab4382d2SGreg Kroah-Hartman 1013ab4382d2SGreg Kroah-Hartman /** 1014ab4382d2SGreg Kroah-Hartman * uart_get_lsr_info - get line status register info 1015ab4382d2SGreg Kroah-Hartman * @tty: tty associated with the UART 1016ab4382d2SGreg Kroah-Hartman * @state: UART being queried 1017ab4382d2SGreg Kroah-Hartman * @value: returned modem value 1018ab4382d2SGreg Kroah-Hartman */ 1019ab4382d2SGreg Kroah-Hartman static int uart_get_lsr_info(struct tty_struct *tty, 1020ab4382d2SGreg Kroah-Hartman struct uart_state *state, unsigned int __user *value) 1021ab4382d2SGreg Kroah-Hartman { 10224047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 1023ab4382d2SGreg Kroah-Hartman unsigned int result; 1024ab4382d2SGreg Kroah-Hartman 1025ab4382d2SGreg Kroah-Hartman result = uport->ops->tx_empty(uport); 1026ab4382d2SGreg Kroah-Hartman 1027ab4382d2SGreg Kroah-Hartman /* 1028ab4382d2SGreg Kroah-Hartman * If we're about to load something into the transmit 1029ab4382d2SGreg Kroah-Hartman * register, we'll pretend the transmitter isn't empty to 1030ab4382d2SGreg Kroah-Hartman * avoid a race condition (depending on when the transmit 1031ab4382d2SGreg Kroah-Hartman * interrupt happens). 1032ab4382d2SGreg Kroah-Hartman */ 1033ab4382d2SGreg Kroah-Hartman if (uport->x_char || 1034ab4382d2SGreg Kroah-Hartman ((uart_circ_chars_pending(&state->xmit) > 0) && 1035d01f4d18SPeter Hurley !uart_tx_stopped(uport))) 1036ab4382d2SGreg Kroah-Hartman result &= ~TIOCSER_TEMT; 1037ab4382d2SGreg Kroah-Hartman 1038ab4382d2SGreg Kroah-Hartman return put_user(result, value); 1039ab4382d2SGreg Kroah-Hartman } 1040ab4382d2SGreg Kroah-Hartman 104160b33c13SAlan Cox static int uart_tiocmget(struct tty_struct *tty) 1042ab4382d2SGreg Kroah-Hartman { 1043ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1044ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 10454047b371SPeter Hurley struct uart_port *uport; 1046ab4382d2SGreg Kroah-Hartman int result = -EIO; 1047ab4382d2SGreg Kroah-Hartman 1048ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 10494047b371SPeter Hurley uport = uart_port_check(state); 10504047b371SPeter Hurley if (!uport) 10514047b371SPeter Hurley goto out; 10524047b371SPeter Hurley 105318900ca6SPeter Hurley if (!tty_io_error(tty)) { 1054ab4382d2SGreg Kroah-Hartman result = uport->mctrl; 1055ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1056ab4382d2SGreg Kroah-Hartman result |= uport->ops->get_mctrl(uport); 1057ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1058ab4382d2SGreg Kroah-Hartman } 10594047b371SPeter Hurley out: 1060ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1061ab4382d2SGreg Kroah-Hartman return result; 1062ab4382d2SGreg Kroah-Hartman } 1063ab4382d2SGreg Kroah-Hartman 1064ab4382d2SGreg Kroah-Hartman static int 106520b9d177SAlan Cox uart_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear) 1066ab4382d2SGreg Kroah-Hartman { 1067ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1068ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 10694047b371SPeter Hurley struct uart_port *uport; 1070ab4382d2SGreg Kroah-Hartman int ret = -EIO; 1071ab4382d2SGreg Kroah-Hartman 1072ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 10734047b371SPeter Hurley uport = uart_port_check(state); 10744047b371SPeter Hurley if (!uport) 10754047b371SPeter Hurley goto out; 10764047b371SPeter Hurley 107718900ca6SPeter Hurley if (!tty_io_error(tty)) { 1078ab4382d2SGreg Kroah-Hartman uart_update_mctrl(uport, set, clear); 1079ab4382d2SGreg Kroah-Hartman ret = 0; 1080ab4382d2SGreg Kroah-Hartman } 10814047b371SPeter Hurley out: 1082ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1083ab4382d2SGreg Kroah-Hartman return ret; 1084ab4382d2SGreg Kroah-Hartman } 1085ab4382d2SGreg Kroah-Hartman 1086ab4382d2SGreg Kroah-Hartman static int uart_break_ctl(struct tty_struct *tty, int break_state) 1087ab4382d2SGreg Kroah-Hartman { 1088ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1089ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 10904047b371SPeter Hurley struct uart_port *uport; 10914047b371SPeter Hurley int ret = -EIO; 1092ab4382d2SGreg Kroah-Hartman 1093ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 10944047b371SPeter Hurley uport = uart_port_check(state); 10954047b371SPeter Hurley if (!uport) 10964047b371SPeter Hurley goto out; 1097ab4382d2SGreg Kroah-Hartman 10987d73170eSJiangfeng Xiao if (uport->type != PORT_UNKNOWN && uport->ops->break_ctl) 1099ab4382d2SGreg Kroah-Hartman uport->ops->break_ctl(uport, break_state); 11004047b371SPeter Hurley ret = 0; 11014047b371SPeter Hurley out: 1102ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 11034047b371SPeter Hurley return ret; 1104ab4382d2SGreg Kroah-Hartman } 1105ab4382d2SGreg Kroah-Hartman 1106ab4382d2SGreg Kroah-Hartman static int uart_do_autoconfig(struct tty_struct *tty, struct uart_state *state) 1107ab4382d2SGreg Kroah-Hartman { 1108ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 11094047b371SPeter Hurley struct uart_port *uport; 1110ab4382d2SGreg Kroah-Hartman int flags, ret; 1111ab4382d2SGreg Kroah-Hartman 1112ab4382d2SGreg Kroah-Hartman if (!capable(CAP_SYS_ADMIN)) 1113ab4382d2SGreg Kroah-Hartman return -EPERM; 1114ab4382d2SGreg Kroah-Hartman 1115ab4382d2SGreg Kroah-Hartman /* 1116ab4382d2SGreg Kroah-Hartman * Take the per-port semaphore. This prevents count from 1117ab4382d2SGreg Kroah-Hartman * changing, and hence any extra opens of the port while 1118ab4382d2SGreg Kroah-Hartman * we're auto-configuring. 1119ab4382d2SGreg Kroah-Hartman */ 1120ab4382d2SGreg Kroah-Hartman if (mutex_lock_interruptible(&port->mutex)) 1121ab4382d2SGreg Kroah-Hartman return -ERESTARTSYS; 1122ab4382d2SGreg Kroah-Hartman 11234047b371SPeter Hurley uport = uart_port_check(state); 11244047b371SPeter Hurley if (!uport) { 11254047b371SPeter Hurley ret = -EIO; 11264047b371SPeter Hurley goto out; 11274047b371SPeter Hurley } 11284047b371SPeter Hurley 1129ab4382d2SGreg Kroah-Hartman ret = -EBUSY; 1130ab4382d2SGreg Kroah-Hartman if (tty_port_users(port) == 1) { 1131ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 1132ab4382d2SGreg Kroah-Hartman 1133ab4382d2SGreg Kroah-Hartman /* 1134ab4382d2SGreg Kroah-Hartman * If we already have a port type configured, 1135ab4382d2SGreg Kroah-Hartman * we must release its resources. 1136ab4382d2SGreg Kroah-Hartman */ 1137a7cfaf16SFabio Estevam if (uport->type != PORT_UNKNOWN && uport->ops->release_port) 1138ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 1139ab4382d2SGreg Kroah-Hartman 1140ab4382d2SGreg Kroah-Hartman flags = UART_CONFIG_TYPE; 1141ab4382d2SGreg Kroah-Hartman if (uport->flags & UPF_AUTO_IRQ) 1142ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_IRQ; 1143ab4382d2SGreg Kroah-Hartman 1144ab4382d2SGreg Kroah-Hartman /* 1145ab4382d2SGreg Kroah-Hartman * This will claim the ports resources if 1146ab4382d2SGreg Kroah-Hartman * a port is found. 1147ab4382d2SGreg Kroah-Hartman */ 1148ab4382d2SGreg Kroah-Hartman uport->ops->config_port(uport, flags); 1149ab4382d2SGreg Kroah-Hartman 1150ab4382d2SGreg Kroah-Hartman ret = uart_startup(tty, state, 1); 115171456906SSebastian Andrzej Siewior if (ret == 0) 115271456906SSebastian Andrzej Siewior tty_port_set_initialized(port, true); 1153b3b57646SRob Herring if (ret > 0) 1154b3b57646SRob Herring ret = 0; 1155ab4382d2SGreg Kroah-Hartman } 11564047b371SPeter Hurley out: 1157ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1158ab4382d2SGreg Kroah-Hartman return ret; 1159ab4382d2SGreg Kroah-Hartman } 1160ab4382d2SGreg Kroah-Hartman 11611fdc3106SAlexander Shiyan static void uart_enable_ms(struct uart_port *uport) 11621fdc3106SAlexander Shiyan { 11631fdc3106SAlexander Shiyan /* 11641fdc3106SAlexander Shiyan * Force modem status interrupts on 11651fdc3106SAlexander Shiyan */ 11661fdc3106SAlexander Shiyan if (uport->ops->enable_ms) 11671fdc3106SAlexander Shiyan uport->ops->enable_ms(uport); 11681fdc3106SAlexander Shiyan } 11691fdc3106SAlexander Shiyan 1170ab4382d2SGreg Kroah-Hartman /* 1171ab4382d2SGreg Kroah-Hartman * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change 1172ab4382d2SGreg Kroah-Hartman * - mask passed in arg for lines of interest 1173ab4382d2SGreg Kroah-Hartman * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) 1174ab4382d2SGreg Kroah-Hartman * Caller should use TIOCGICOUNT to see which one it was 1175ab4382d2SGreg Kroah-Hartman * 1176ab4382d2SGreg Kroah-Hartman * FIXME: This wants extracting into a common all driver implementation 1177ab4382d2SGreg Kroah-Hartman * of TIOCMWAIT using tty_port. 1178ab4382d2SGreg Kroah-Hartman */ 11799ed19428SPeter Hurley static int uart_wait_modem_status(struct uart_state *state, unsigned long arg) 1180ab4382d2SGreg Kroah-Hartman { 11819ed19428SPeter Hurley struct uart_port *uport; 1182ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1183ab4382d2SGreg Kroah-Hartman DECLARE_WAITQUEUE(wait, current); 1184ab4382d2SGreg Kroah-Hartman struct uart_icount cprev, cnow; 1185ab4382d2SGreg Kroah-Hartman int ret; 1186ab4382d2SGreg Kroah-Hartman 1187ab4382d2SGreg Kroah-Hartman /* 1188ab4382d2SGreg Kroah-Hartman * note the counters on entry 1189ab4382d2SGreg Kroah-Hartman */ 11909ed19428SPeter Hurley uport = uart_port_ref(state); 11919ed19428SPeter Hurley if (!uport) 11929ed19428SPeter Hurley return -EIO; 1193ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1194ab4382d2SGreg Kroah-Hartman memcpy(&cprev, &uport->icount, sizeof(struct uart_icount)); 11951fdc3106SAlexander Shiyan uart_enable_ms(uport); 1196ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1197ab4382d2SGreg Kroah-Hartman 1198ab4382d2SGreg Kroah-Hartman add_wait_queue(&port->delta_msr_wait, &wait); 1199ab4382d2SGreg Kroah-Hartman for (;;) { 1200ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1201ab4382d2SGreg Kroah-Hartman memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); 1202ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1203ab4382d2SGreg Kroah-Hartman 1204ab4382d2SGreg Kroah-Hartman set_current_state(TASK_INTERRUPTIBLE); 1205ab4382d2SGreg Kroah-Hartman 1206ab4382d2SGreg Kroah-Hartman if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || 1207ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || 1208ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || 1209ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) { 1210ab4382d2SGreg Kroah-Hartman ret = 0; 1211ab4382d2SGreg Kroah-Hartman break; 1212ab4382d2SGreg Kroah-Hartman } 1213ab4382d2SGreg Kroah-Hartman 1214ab4382d2SGreg Kroah-Hartman schedule(); 1215ab4382d2SGreg Kroah-Hartman 1216ab4382d2SGreg Kroah-Hartman /* see if a signal did it */ 1217ab4382d2SGreg Kroah-Hartman if (signal_pending(current)) { 1218ab4382d2SGreg Kroah-Hartman ret = -ERESTARTSYS; 1219ab4382d2SGreg Kroah-Hartman break; 1220ab4382d2SGreg Kroah-Hartman } 1221ab4382d2SGreg Kroah-Hartman 1222ab4382d2SGreg Kroah-Hartman cprev = cnow; 1223ab4382d2SGreg Kroah-Hartman } 122497f9f707SFabian Frederick __set_current_state(TASK_RUNNING); 1225ab4382d2SGreg Kroah-Hartman remove_wait_queue(&port->delta_msr_wait, &wait); 12269ed19428SPeter Hurley uart_port_deref(uport); 1227ab4382d2SGreg Kroah-Hartman 1228ab4382d2SGreg Kroah-Hartman return ret; 1229ab4382d2SGreg Kroah-Hartman } 1230ab4382d2SGreg Kroah-Hartman 1231ab4382d2SGreg Kroah-Hartman /* 1232ab4382d2SGreg Kroah-Hartman * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) 1233ab4382d2SGreg Kroah-Hartman * Return: write counters to the user passed counter struct 1234ab4382d2SGreg Kroah-Hartman * NB: both 1->0 and 0->1 transitions are counted except for 1235ab4382d2SGreg Kroah-Hartman * RI where only 0->1 is counted. 1236ab4382d2SGreg Kroah-Hartman */ 1237ab4382d2SGreg Kroah-Hartman static int uart_get_icount(struct tty_struct *tty, 1238ab4382d2SGreg Kroah-Hartman struct serial_icounter_struct *icount) 1239ab4382d2SGreg Kroah-Hartman { 1240ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1241ab4382d2SGreg Kroah-Hartman struct uart_icount cnow; 12429ed19428SPeter Hurley struct uart_port *uport; 1243ab4382d2SGreg Kroah-Hartman 12449ed19428SPeter Hurley uport = uart_port_ref(state); 12459ed19428SPeter Hurley if (!uport) 12469ed19428SPeter Hurley return -EIO; 1247ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1248ab4382d2SGreg Kroah-Hartman memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); 1249ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 12509ed19428SPeter Hurley uart_port_deref(uport); 1251ab4382d2SGreg Kroah-Hartman 1252ab4382d2SGreg Kroah-Hartman icount->cts = cnow.cts; 1253ab4382d2SGreg Kroah-Hartman icount->dsr = cnow.dsr; 1254ab4382d2SGreg Kroah-Hartman icount->rng = cnow.rng; 1255ab4382d2SGreg Kroah-Hartman icount->dcd = cnow.dcd; 1256ab4382d2SGreg Kroah-Hartman icount->rx = cnow.rx; 1257ab4382d2SGreg Kroah-Hartman icount->tx = cnow.tx; 1258ab4382d2SGreg Kroah-Hartman icount->frame = cnow.frame; 1259ab4382d2SGreg Kroah-Hartman icount->overrun = cnow.overrun; 1260ab4382d2SGreg Kroah-Hartman icount->parity = cnow.parity; 1261ab4382d2SGreg Kroah-Hartman icount->brk = cnow.brk; 1262ab4382d2SGreg Kroah-Hartman icount->buf_overrun = cnow.buf_overrun; 1263ab4382d2SGreg Kroah-Hartman 1264ab4382d2SGreg Kroah-Hartman return 0; 1265ab4382d2SGreg Kroah-Hartman } 1266ab4382d2SGreg Kroah-Hartman 1267a5f276f1SRicardo Ribalda Delgado static int uart_get_rs485_config(struct uart_port *port, 1268a5f276f1SRicardo Ribalda Delgado struct serial_rs485 __user *rs485) 1269a5f276f1SRicardo Ribalda Delgado { 1270bd737f87SRicardo Ribalda Delgado unsigned long flags; 1271bd737f87SRicardo Ribalda Delgado struct serial_rs485 aux; 1272bd737f87SRicardo Ribalda Delgado 1273bd737f87SRicardo Ribalda Delgado spin_lock_irqsave(&port->lock, flags); 1274bd737f87SRicardo Ribalda Delgado aux = port->rs485; 1275bd737f87SRicardo Ribalda Delgado spin_unlock_irqrestore(&port->lock, flags); 1276bd737f87SRicardo Ribalda Delgado 1277bd737f87SRicardo Ribalda Delgado if (copy_to_user(rs485, &aux, sizeof(aux))) 1278a5f276f1SRicardo Ribalda Delgado return -EFAULT; 1279bd737f87SRicardo Ribalda Delgado 1280a5f276f1SRicardo Ribalda Delgado return 0; 1281a5f276f1SRicardo Ribalda Delgado } 1282a5f276f1SRicardo Ribalda Delgado 1283a5f276f1SRicardo Ribalda Delgado static int uart_set_rs485_config(struct uart_port *port, 1284a5f276f1SRicardo Ribalda Delgado struct serial_rs485 __user *rs485_user) 1285a5f276f1SRicardo Ribalda Delgado { 1286a5f276f1SRicardo Ribalda Delgado struct serial_rs485 rs485; 1287a5f276f1SRicardo Ribalda Delgado int ret; 1288bd737f87SRicardo Ribalda Delgado unsigned long flags; 1289a5f276f1SRicardo Ribalda Delgado 1290a5f276f1SRicardo Ribalda Delgado if (!port->rs485_config) 129179c5966cSJohan Hovold return -ENOTTY; 1292a5f276f1SRicardo Ribalda Delgado 1293a5f276f1SRicardo Ribalda Delgado if (copy_from_user(&rs485, rs485_user, sizeof(*rs485_user))) 1294a5f276f1SRicardo Ribalda Delgado return -EFAULT; 1295a5f276f1SRicardo Ribalda Delgado 1296bd737f87SRicardo Ribalda Delgado spin_lock_irqsave(&port->lock, flags); 1297a5f276f1SRicardo Ribalda Delgado ret = port->rs485_config(port, &rs485); 1298bd737f87SRicardo Ribalda Delgado spin_unlock_irqrestore(&port->lock, flags); 1299a5f276f1SRicardo Ribalda Delgado if (ret) 1300a5f276f1SRicardo Ribalda Delgado return ret; 1301a5f276f1SRicardo Ribalda Delgado 1302a5f276f1SRicardo Ribalda Delgado if (copy_to_user(rs485_user, &port->rs485, sizeof(port->rs485))) 1303a5f276f1SRicardo Ribalda Delgado return -EFAULT; 1304a5f276f1SRicardo Ribalda Delgado 1305a5f276f1SRicardo Ribalda Delgado return 0; 1306a5f276f1SRicardo Ribalda Delgado } 1307a5f276f1SRicardo Ribalda Delgado 1308ad8c0eaaSNicolas Ferre static int uart_get_iso7816_config(struct uart_port *port, 1309ad8c0eaaSNicolas Ferre struct serial_iso7816 __user *iso7816) 1310ad8c0eaaSNicolas Ferre { 1311ad8c0eaaSNicolas Ferre unsigned long flags; 1312ad8c0eaaSNicolas Ferre struct serial_iso7816 aux; 1313ad8c0eaaSNicolas Ferre 1314ad8c0eaaSNicolas Ferre if (!port->iso7816_config) 131579c5966cSJohan Hovold return -ENOTTY; 1316ad8c0eaaSNicolas Ferre 1317ad8c0eaaSNicolas Ferre spin_lock_irqsave(&port->lock, flags); 1318ad8c0eaaSNicolas Ferre aux = port->iso7816; 1319ad8c0eaaSNicolas Ferre spin_unlock_irqrestore(&port->lock, flags); 1320ad8c0eaaSNicolas Ferre 1321ad8c0eaaSNicolas Ferre if (copy_to_user(iso7816, &aux, sizeof(aux))) 1322ad8c0eaaSNicolas Ferre return -EFAULT; 1323ad8c0eaaSNicolas Ferre 1324ad8c0eaaSNicolas Ferre return 0; 1325ad8c0eaaSNicolas Ferre } 1326ad8c0eaaSNicolas Ferre 1327ad8c0eaaSNicolas Ferre static int uart_set_iso7816_config(struct uart_port *port, 1328ad8c0eaaSNicolas Ferre struct serial_iso7816 __user *iso7816_user) 1329ad8c0eaaSNicolas Ferre { 1330ad8c0eaaSNicolas Ferre struct serial_iso7816 iso7816; 1331ad8c0eaaSNicolas Ferre int i, ret; 1332ad8c0eaaSNicolas Ferre unsigned long flags; 1333ad8c0eaaSNicolas Ferre 1334ad8c0eaaSNicolas Ferre if (!port->iso7816_config) 133579c5966cSJohan Hovold return -ENOTTY; 1336ad8c0eaaSNicolas Ferre 1337ad8c0eaaSNicolas Ferre if (copy_from_user(&iso7816, iso7816_user, sizeof(*iso7816_user))) 1338ad8c0eaaSNicolas Ferre return -EFAULT; 1339ad8c0eaaSNicolas Ferre 1340ad8c0eaaSNicolas Ferre /* 1341ad8c0eaaSNicolas Ferre * There are 5 words reserved for future use. Check that userspace 1342ad8c0eaaSNicolas Ferre * doesn't put stuff in there to prevent breakages in the future. 1343ad8c0eaaSNicolas Ferre */ 1344ad8c0eaaSNicolas Ferre for (i = 0; i < 5; i++) 1345ad8c0eaaSNicolas Ferre if (iso7816.reserved[i]) 1346ad8c0eaaSNicolas Ferre return -EINVAL; 1347ad8c0eaaSNicolas Ferre 1348ad8c0eaaSNicolas Ferre spin_lock_irqsave(&port->lock, flags); 1349ad8c0eaaSNicolas Ferre ret = port->iso7816_config(port, &iso7816); 1350ad8c0eaaSNicolas Ferre spin_unlock_irqrestore(&port->lock, flags); 1351ad8c0eaaSNicolas Ferre if (ret) 1352ad8c0eaaSNicolas Ferre return ret; 1353ad8c0eaaSNicolas Ferre 1354ad8c0eaaSNicolas Ferre if (copy_to_user(iso7816_user, &port->iso7816, sizeof(port->iso7816))) 1355ad8c0eaaSNicolas Ferre return -EFAULT; 1356ad8c0eaaSNicolas Ferre 1357ad8c0eaaSNicolas Ferre return 0; 1358ad8c0eaaSNicolas Ferre } 1359ad8c0eaaSNicolas Ferre 1360ab4382d2SGreg Kroah-Hartman /* 1361ab4382d2SGreg Kroah-Hartman * Called via sys_ioctl. We can use spin_lock_irq() here. 1362ab4382d2SGreg Kroah-Hartman */ 1363ab4382d2SGreg Kroah-Hartman static int 13644047b371SPeter Hurley uart_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg) 1365ab4382d2SGreg Kroah-Hartman { 1366ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1367ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 13684047b371SPeter Hurley struct uart_port *uport; 1369ab4382d2SGreg Kroah-Hartman void __user *uarg = (void __user *)arg; 1370ab4382d2SGreg Kroah-Hartman int ret = -ENOIOCTLCMD; 1371ab4382d2SGreg Kroah-Hartman 1372ab4382d2SGreg Kroah-Hartman 1373ab4382d2SGreg Kroah-Hartman /* 1374ab4382d2SGreg Kroah-Hartman * These ioctls don't rely on the hardware to be present. 1375ab4382d2SGreg Kroah-Hartman */ 1376ab4382d2SGreg Kroah-Hartman switch (cmd) { 1377ab4382d2SGreg Kroah-Hartman case TIOCSERCONFIG: 13787c8ab967SPeter Hurley down_write(&tty->termios_rwsem); 1379ab4382d2SGreg Kroah-Hartman ret = uart_do_autoconfig(tty, state); 13807c8ab967SPeter Hurley up_write(&tty->termios_rwsem); 1381ab4382d2SGreg Kroah-Hartman break; 1382ab4382d2SGreg Kroah-Hartman } 1383ab4382d2SGreg Kroah-Hartman 1384ab4382d2SGreg Kroah-Hartman if (ret != -ENOIOCTLCMD) 1385ab4382d2SGreg Kroah-Hartman goto out; 1386ab4382d2SGreg Kroah-Hartman 138718900ca6SPeter Hurley if (tty_io_error(tty)) { 1388ab4382d2SGreg Kroah-Hartman ret = -EIO; 1389ab4382d2SGreg Kroah-Hartman goto out; 1390ab4382d2SGreg Kroah-Hartman } 1391ab4382d2SGreg Kroah-Hartman 1392ab4382d2SGreg Kroah-Hartman /* 1393ab4382d2SGreg Kroah-Hartman * The following should only be used when hardware is present. 1394ab4382d2SGreg Kroah-Hartman */ 1395ab4382d2SGreg Kroah-Hartman switch (cmd) { 1396ab4382d2SGreg Kroah-Hartman case TIOCMIWAIT: 1397ab4382d2SGreg Kroah-Hartman ret = uart_wait_modem_status(state, arg); 1398ab4382d2SGreg Kroah-Hartman break; 1399ab4382d2SGreg Kroah-Hartman } 1400ab4382d2SGreg Kroah-Hartman 1401ab4382d2SGreg Kroah-Hartman if (ret != -ENOIOCTLCMD) 1402ab4382d2SGreg Kroah-Hartman goto out; 1403ab4382d2SGreg Kroah-Hartman 1404ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 14054047b371SPeter Hurley uport = uart_port_check(state); 1406ab4382d2SGreg Kroah-Hartman 14074047b371SPeter Hurley if (!uport || tty_io_error(tty)) { 1408ab4382d2SGreg Kroah-Hartman ret = -EIO; 1409ab4382d2SGreg Kroah-Hartman goto out_up; 1410ab4382d2SGreg Kroah-Hartman } 1411ab4382d2SGreg Kroah-Hartman 1412ab4382d2SGreg Kroah-Hartman /* 1413ab4382d2SGreg Kroah-Hartman * All these rely on hardware being present and need to be 1414ab4382d2SGreg Kroah-Hartman * protected against the tty being hung up. 1415ab4382d2SGreg Kroah-Hartman */ 1416a9c20a9cSRicardo Ribalda Delgado 1417ab4382d2SGreg Kroah-Hartman switch (cmd) { 1418a9c20a9cSRicardo Ribalda Delgado case TIOCSERGETLSR: /* Get line status register */ 1419a9c20a9cSRicardo Ribalda Delgado ret = uart_get_lsr_info(tty, state, uarg); 1420a9c20a9cSRicardo Ribalda Delgado break; 1421a9c20a9cSRicardo Ribalda Delgado 1422a5f276f1SRicardo Ribalda Delgado case TIOCGRS485: 14234047b371SPeter Hurley ret = uart_get_rs485_config(uport, uarg); 1424a5f276f1SRicardo Ribalda Delgado break; 1425a5f276f1SRicardo Ribalda Delgado 1426a5f276f1SRicardo Ribalda Delgado case TIOCSRS485: 14274047b371SPeter Hurley ret = uart_set_rs485_config(uport, uarg); 1428a5f276f1SRicardo Ribalda Delgado break; 1429ad8c0eaaSNicolas Ferre 1430ad8c0eaaSNicolas Ferre case TIOCSISO7816: 1431ad8c0eaaSNicolas Ferre ret = uart_set_iso7816_config(state->uart_port, uarg); 1432ad8c0eaaSNicolas Ferre break; 1433ad8c0eaaSNicolas Ferre 1434ad8c0eaaSNicolas Ferre case TIOCGISO7816: 1435ad8c0eaaSNicolas Ferre ret = uart_get_iso7816_config(state->uart_port, uarg); 1436ad8c0eaaSNicolas Ferre break; 14374047b371SPeter Hurley default: 1438ab4382d2SGreg Kroah-Hartman if (uport->ops->ioctl) 1439ab4382d2SGreg Kroah-Hartman ret = uport->ops->ioctl(uport, cmd, arg); 1440ab4382d2SGreg Kroah-Hartman break; 1441ab4382d2SGreg Kroah-Hartman } 1442ab4382d2SGreg Kroah-Hartman out_up: 1443ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1444ab4382d2SGreg Kroah-Hartman out: 1445ab4382d2SGreg Kroah-Hartman return ret; 1446ab4382d2SGreg Kroah-Hartman } 1447ab4382d2SGreg Kroah-Hartman 1448ab4382d2SGreg Kroah-Hartman static void uart_set_ldisc(struct tty_struct *tty) 1449ab4382d2SGreg Kroah-Hartman { 1450ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 14514047b371SPeter Hurley struct uart_port *uport; 14522f70e49eSAlexey Kardashevskiy struct tty_port *port = &state->port; 14532f70e49eSAlexey Kardashevskiy 14542f70e49eSAlexey Kardashevskiy if (!tty_port_initialized(port)) 14552f70e49eSAlexey Kardashevskiy return; 1456ab4382d2SGreg Kroah-Hartman 1457db1b9dfcSPeter Hurley mutex_lock(&state->port.mutex); 14584047b371SPeter Hurley uport = uart_port_check(state); 14594047b371SPeter Hurley if (uport && uport->ops->set_ldisc) 1460732a84a0SPeter Hurley uport->ops->set_ldisc(uport, &tty->termios); 1461db1b9dfcSPeter Hurley mutex_unlock(&state->port.mutex); 1462db1b9dfcSPeter Hurley } 1463ab4382d2SGreg Kroah-Hartman 1464ab4382d2SGreg Kroah-Hartman static void uart_set_termios(struct tty_struct *tty, 1465ab4382d2SGreg Kroah-Hartman struct ktermios *old_termios) 1466ab4382d2SGreg Kroah-Hartman { 1467ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 14684047b371SPeter Hurley struct uart_port *uport; 1469adc8d746SAlan Cox unsigned int cflag = tty->termios.c_cflag; 14702cbacafdSRussell King unsigned int iflag_mask = IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK; 14712cbacafdSRussell King bool sw_changed = false; 1472ab4382d2SGreg Kroah-Hartman 14734047b371SPeter Hurley mutex_lock(&state->port.mutex); 14744047b371SPeter Hurley uport = uart_port_check(state); 14754047b371SPeter Hurley if (!uport) 14764047b371SPeter Hurley goto out; 14774047b371SPeter Hurley 14782cbacafdSRussell King /* 14792cbacafdSRussell King * Drivers doing software flow control also need to know 14802cbacafdSRussell King * about changes to these input settings. 14812cbacafdSRussell King */ 14822cbacafdSRussell King if (uport->flags & UPF_SOFT_FLOW) { 14832cbacafdSRussell King iflag_mask |= IXANY|IXON|IXOFF; 14842cbacafdSRussell King sw_changed = 14852cbacafdSRussell King tty->termios.c_cc[VSTART] != old_termios->c_cc[VSTART] || 14862cbacafdSRussell King tty->termios.c_cc[VSTOP] != old_termios->c_cc[VSTOP]; 14872cbacafdSRussell King } 1488ab4382d2SGreg Kroah-Hartman 1489ab4382d2SGreg Kroah-Hartman /* 1490ab4382d2SGreg Kroah-Hartman * These are the bits that are used to setup various 1491ab4382d2SGreg Kroah-Hartman * flags in the low level driver. We can ignore the Bfoo 1492ab4382d2SGreg Kroah-Hartman * bits in c_cflag; c_[io]speed will always be set 1493ab4382d2SGreg Kroah-Hartman * appropriately by set_termios() in tty_ioctl.c 1494ab4382d2SGreg Kroah-Hartman */ 1495ab4382d2SGreg Kroah-Hartman if ((cflag ^ old_termios->c_cflag) == 0 && 1496adc8d746SAlan Cox tty->termios.c_ospeed == old_termios->c_ospeed && 1497adc8d746SAlan Cox tty->termios.c_ispeed == old_termios->c_ispeed && 14982cbacafdSRussell King ((tty->termios.c_iflag ^ old_termios->c_iflag) & iflag_mask) == 0 && 14992cbacafdSRussell King !sw_changed) { 15004047b371SPeter Hurley goto out; 1501ab4382d2SGreg Kroah-Hartman } 1502ab4382d2SGreg Kroah-Hartman 1503ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, old_termios); 1504c7a6b9e4SHariprasad Kelam /* reload cflag from termios; port driver may have overridden flags */ 1505c18b55fdSPeter Hurley cflag = tty->termios.c_cflag; 1506ab4382d2SGreg Kroah-Hartman 1507ab4382d2SGreg Kroah-Hartman /* Handle transition to B0 status */ 1508ab4382d2SGreg Kroah-Hartman if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) 1509dec94e70SRussell King uart_clear_mctrl(uport, TIOCM_RTS | TIOCM_DTR); 1510ab4382d2SGreg Kroah-Hartman /* Handle transition away from B0 status */ 1511ab4382d2SGreg Kroah-Hartman else if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { 1512ab4382d2SGreg Kroah-Hartman unsigned int mask = TIOCM_DTR; 15134ed71addSTamseel Shams 151497ef38b8SPeter Hurley if (!(cflag & CRTSCTS) || !tty_throttled(tty)) 1515ab4382d2SGreg Kroah-Hartman mask |= TIOCM_RTS; 1516dec94e70SRussell King uart_set_mctrl(uport, mask); 1517ab4382d2SGreg Kroah-Hartman } 15184047b371SPeter Hurley out: 15194047b371SPeter Hurley mutex_unlock(&state->port.mutex); 1520ab4382d2SGreg Kroah-Hartman } 1521ab4382d2SGreg Kroah-Hartman 1522ab4382d2SGreg Kroah-Hartman /* 1523ef4f527cSKevin Cernekee * Calls to uart_close() are serialised via the tty_lock in 1524ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:tty_release() 1525ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:do_tty_hangup() 1526ab4382d2SGreg Kroah-Hartman */ 1527ab4382d2SGreg Kroah-Hartman static void uart_close(struct tty_struct *tty, struct file *filp) 1528ab4382d2SGreg Kroah-Hartman { 1529ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1530ab4382d2SGreg Kroah-Hartman 153191b32f54SPeter Hurley if (!state) { 153291b32f54SPeter Hurley struct uart_driver *drv = tty->driver->driver_state; 15339356335fSColin Ian King struct tty_port *port; 153491b32f54SPeter Hurley 153591b32f54SPeter Hurley state = drv->state + tty->index; 153691b32f54SPeter Hurley port = &state->port; 153791b32f54SPeter Hurley spin_lock_irq(&port->lock); 153891b32f54SPeter Hurley --port->count; 153991b32f54SPeter Hurley spin_unlock_irq(&port->lock); 1540ab4382d2SGreg Kroah-Hartman return; 154191b32f54SPeter Hurley } 1542ab4382d2SGreg Kroah-Hartman 154339b3d892SPeter Hurley pr_debug("uart_close(%d) called\n", tty->index); 1544ab4382d2SGreg Kroah-Hartman 1545761ed4a9SRob Herring tty_port_close(tty->port, tty, filp); 1546761ed4a9SRob Herring } 1547ab4382d2SGreg Kroah-Hartman 1548761ed4a9SRob Herring static void uart_tty_port_shutdown(struct tty_port *port) 1549761ed4a9SRob Herring { 1550761ed4a9SRob Herring struct uart_state *state = container_of(port, struct uart_state, port); 1551761ed4a9SRob Herring struct uart_port *uport = uart_port_check(state); 1552af224ca2SPeter Hurley 1553ab4382d2SGreg Kroah-Hartman /* 1554ab4382d2SGreg Kroah-Hartman * At this point, we stop accepting input. To do this, we 1555ab4382d2SGreg Kroah-Hartman * disable the receive line status interrupts. 1556ab4382d2SGreg Kroah-Hartman */ 1557a5a2b130SAndy Shevchenko if (WARN(!uport, "detached port still initialized!\n")) 1558a5a2b130SAndy Shevchenko return; 1559761ed4a9SRob Herring 1560a5a2b130SAndy Shevchenko spin_lock_irq(&uport->lock); 1561ab4382d2SGreg Kroah-Hartman uport->ops->stop_rx(uport); 15626fb98fb3SPeter Hurley spin_unlock_irq(&uport->lock); 1563761ed4a9SRob Herring 1564761ed4a9SRob Herring uart_port_shutdown(port); 1565761ed4a9SRob Herring 1566ab4382d2SGreg Kroah-Hartman /* 1567761ed4a9SRob Herring * It's possible for shutdown to be called after suspend if we get 1568761ed4a9SRob Herring * a DCD drop (hangup) at just the right time. Clear suspended bit so 1569761ed4a9SRob Herring * we don't try to resume a port that has been shutdown. 1570ab4382d2SGreg Kroah-Hartman */ 1571761ed4a9SRob Herring tty_port_set_suspended(port, 0); 1572ab4382d2SGreg Kroah-Hartman 15736f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_OFF); 1574ab4382d2SGreg Kroah-Hartman 1575ab4382d2SGreg Kroah-Hartman } 1576ab4382d2SGreg Kroah-Hartman 15771f33a51dSJiri Slaby static void uart_wait_until_sent(struct tty_struct *tty, int timeout) 1578ab4382d2SGreg Kroah-Hartman { 15791f33a51dSJiri Slaby struct uart_state *state = tty->driver_data; 15809ed19428SPeter Hurley struct uart_port *port; 1581ab4382d2SGreg Kroah-Hartman unsigned long char_time, expire; 1582ab4382d2SGreg Kroah-Hartman 15839ed19428SPeter Hurley port = uart_port_ref(state); 1584ef510beaSAndy Shevchenko if (!port) 1585ef510beaSAndy Shevchenko return; 1586ef510beaSAndy Shevchenko 1587ef510beaSAndy Shevchenko if (port->type == PORT_UNKNOWN || port->fifosize == 0) { 15889ed19428SPeter Hurley uart_port_deref(port); 1589ab4382d2SGreg Kroah-Hartman return; 15909ed19428SPeter Hurley } 1591ab4382d2SGreg Kroah-Hartman 1592ab4382d2SGreg Kroah-Hartman /* 1593ab4382d2SGreg Kroah-Hartman * Set the check interval to be 1/5 of the estimated time to 1594ab4382d2SGreg Kroah-Hartman * send a single character, and make it at least 1. The check 1595ab4382d2SGreg Kroah-Hartman * interval should also be less than the timeout. 1596ab4382d2SGreg Kroah-Hartman * 1597ab4382d2SGreg Kroah-Hartman * Note: we have to use pretty tight timings here to satisfy 1598ab4382d2SGreg Kroah-Hartman * the NIST-PCTS. 1599ab4382d2SGreg Kroah-Hartman */ 1600ab4382d2SGreg Kroah-Hartman char_time = (port->timeout - HZ/50) / port->fifosize; 1601ab4382d2SGreg Kroah-Hartman char_time = char_time / 5; 1602ab4382d2SGreg Kroah-Hartman if (char_time == 0) 1603ab4382d2SGreg Kroah-Hartman char_time = 1; 1604ab4382d2SGreg Kroah-Hartman if (timeout && timeout < char_time) 1605ab4382d2SGreg Kroah-Hartman char_time = timeout; 1606ab4382d2SGreg Kroah-Hartman 1607ab4382d2SGreg Kroah-Hartman /* 1608ab4382d2SGreg Kroah-Hartman * If the transmitter hasn't cleared in twice the approximate 1609ab4382d2SGreg Kroah-Hartman * amount of time to send the entire FIFO, it probably won't 1610ab4382d2SGreg Kroah-Hartman * ever clear. This assumes the UART isn't doing flow 1611ab4382d2SGreg Kroah-Hartman * control, which is currently the case. Hence, if it ever 1612ab4382d2SGreg Kroah-Hartman * takes longer than port->timeout, this is probably due to a 1613ab4382d2SGreg Kroah-Hartman * UART bug of some kind. So, we clamp the timeout parameter at 1614ab4382d2SGreg Kroah-Hartman * 2*port->timeout. 1615ab4382d2SGreg Kroah-Hartman */ 1616ab4382d2SGreg Kroah-Hartman if (timeout == 0 || timeout > 2 * port->timeout) 1617ab4382d2SGreg Kroah-Hartman timeout = 2 * port->timeout; 1618ab4382d2SGreg Kroah-Hartman 1619ab4382d2SGreg Kroah-Hartman expire = jiffies + timeout; 1620ab4382d2SGreg Kroah-Hartman 1621ab4382d2SGreg Kroah-Hartman pr_debug("uart_wait_until_sent(%d), jiffies=%lu, expire=%lu...\n", 1622ab4382d2SGreg Kroah-Hartman port->line, jiffies, expire); 1623ab4382d2SGreg Kroah-Hartman 1624ab4382d2SGreg Kroah-Hartman /* 1625ab4382d2SGreg Kroah-Hartman * Check whether the transmitter is empty every 'char_time'. 1626ab4382d2SGreg Kroah-Hartman * 'timeout' / 'expire' give us the maximum amount of time 1627ab4382d2SGreg Kroah-Hartman * we wait. 1628ab4382d2SGreg Kroah-Hartman */ 1629ab4382d2SGreg Kroah-Hartman while (!port->ops->tx_empty(port)) { 1630ab4382d2SGreg Kroah-Hartman msleep_interruptible(jiffies_to_msecs(char_time)); 1631ab4382d2SGreg Kroah-Hartman if (signal_pending(current)) 1632ab4382d2SGreg Kroah-Hartman break; 1633ab4382d2SGreg Kroah-Hartman if (time_after(jiffies, expire)) 1634ab4382d2SGreg Kroah-Hartman break; 1635ab4382d2SGreg Kroah-Hartman } 16369ed19428SPeter Hurley uart_port_deref(port); 1637ab4382d2SGreg Kroah-Hartman } 1638ab4382d2SGreg Kroah-Hartman 1639ab4382d2SGreg Kroah-Hartman /* 1640ef4f527cSKevin Cernekee * Calls to uart_hangup() are serialised by the tty_lock in 1641ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:do_tty_hangup() 1642ef4f527cSKevin Cernekee * This runs from a workqueue and can sleep for a _short_ time only. 1643ab4382d2SGreg Kroah-Hartman */ 1644ab4382d2SGreg Kroah-Hartman static void uart_hangup(struct tty_struct *tty) 1645ab4382d2SGreg Kroah-Hartman { 1646ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1647ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1648af224ca2SPeter Hurley struct uart_port *uport; 1649ab4382d2SGreg Kroah-Hartman unsigned long flags; 1650ab4382d2SGreg Kroah-Hartman 165139b3d892SPeter Hurley pr_debug("uart_hangup(%d)\n", tty->index); 1652ab4382d2SGreg Kroah-Hartman 1653ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1654af224ca2SPeter Hurley uport = uart_port_check(state); 1655af224ca2SPeter Hurley WARN(!uport, "hangup of detached port!\n"); 1656af224ca2SPeter Hurley 1657807c8d81SPeter Hurley if (tty_port_active(port)) { 1658ab4382d2SGreg Kroah-Hartman uart_flush_buffer(tty); 1659ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 1660ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 1661ab4382d2SGreg Kroah-Hartman port->count = 0; 1662ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 1663807c8d81SPeter Hurley tty_port_set_active(port, 0); 1664ab4382d2SGreg Kroah-Hartman tty_port_tty_set(port, NULL); 1665af224ca2SPeter Hurley if (uport && !uart_console(uport)) 1666bf903c0cSGeert Uytterhoeven uart_change_pm(state, UART_PM_STATE_OFF); 1667ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->open_wait); 1668ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->delta_msr_wait); 1669ab4382d2SGreg Kroah-Hartman } 1670ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1671ab4382d2SGreg Kroah-Hartman } 1672ab4382d2SGreg Kroah-Hartman 1673af224ca2SPeter Hurley /* uport == NULL if uart_port has already been removed */ 16740b1db830SJiri Slaby static void uart_port_shutdown(struct tty_port *port) 16750b1db830SJiri Slaby { 1676b922e19dSJiri Slaby struct uart_state *state = container_of(port, struct uart_state, port); 16774047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 1678b922e19dSJiri Slaby 1679b922e19dSJiri Slaby /* 1680b922e19dSJiri Slaby * clear delta_msr_wait queue to avoid mem leaks: we may free 1681b922e19dSJiri Slaby * the irq here so the queue might never be woken up. Note 1682b922e19dSJiri Slaby * that we won't end up waiting on delta_msr_wait again since 1683b922e19dSJiri Slaby * any outstanding file descriptors should be pointing at 1684b922e19dSJiri Slaby * hung_up_tty_fops now. 1685b922e19dSJiri Slaby */ 1686b922e19dSJiri Slaby wake_up_interruptible(&port->delta_msr_wait); 1687b922e19dSJiri Slaby 1688*2765852eSJiri Slaby if (uport) { 1689*2765852eSJiri Slaby /* Free the IRQ and disable the port. */ 1690b922e19dSJiri Slaby uport->ops->shutdown(uport); 1691b922e19dSJiri Slaby 1692*2765852eSJiri Slaby /* Ensure that the IRQ handler isn't running on another CPU. */ 1693b922e19dSJiri Slaby synchronize_irq(uport->irq); 16940b1db830SJiri Slaby } 1695*2765852eSJiri Slaby } 16960b1db830SJiri Slaby 1697ab4382d2SGreg Kroah-Hartman static int uart_carrier_raised(struct tty_port *port) 1698ab4382d2SGreg Kroah-Hartman { 1699ab4382d2SGreg Kroah-Hartman struct uart_state *state = container_of(port, struct uart_state, port); 17009ed19428SPeter Hurley struct uart_port *uport; 1701ab4382d2SGreg Kroah-Hartman int mctrl; 17029ed19428SPeter Hurley 17039ed19428SPeter Hurley uport = uart_port_ref(state); 17049ed19428SPeter Hurley /* 17059ed19428SPeter Hurley * Should never observe uport == NULL since checks for hangup should 17069ed19428SPeter Hurley * abort the tty_port_block_til_ready() loop before checking for carrier 17079ed19428SPeter Hurley * raised -- but report carrier raised if it does anyway so open will 17089ed19428SPeter Hurley * continue and not sleep 17099ed19428SPeter Hurley */ 17109ed19428SPeter Hurley if (WARN_ON(!uport)) 17119ed19428SPeter Hurley return 1; 1712ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 17131fdc3106SAlexander Shiyan uart_enable_ms(uport); 1714ab4382d2SGreg Kroah-Hartman mctrl = uport->ops->get_mctrl(uport); 1715ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 17169ed19428SPeter Hurley uart_port_deref(uport); 1717ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_CAR) 1718ab4382d2SGreg Kroah-Hartman return 1; 1719ab4382d2SGreg Kroah-Hartman return 0; 1720ab4382d2SGreg Kroah-Hartman } 1721ab4382d2SGreg Kroah-Hartman 1722a6845e1eSRafael Gago static void uart_dtr_rts(struct tty_port *port, int raise) 1723ab4382d2SGreg Kroah-Hartman { 1724ab4382d2SGreg Kroah-Hartman struct uart_state *state = container_of(port, struct uart_state, port); 17259ed19428SPeter Hurley struct uart_port *uport; 17269ed19428SPeter Hurley 17279ed19428SPeter Hurley uport = uart_port_ref(state); 17289ed19428SPeter Hurley if (!uport) 17299ed19428SPeter Hurley return; 1730a6845e1eSRafael Gago uart_port_dtr_rts(uport, raise); 17319ed19428SPeter Hurley uart_port_deref(uport); 1732ab4382d2SGreg Kroah-Hartman } 1733ab4382d2SGreg Kroah-Hartman 17344cdd17baSJiri Slaby static int uart_install(struct tty_driver *driver, struct tty_struct *tty) 17354cdd17baSJiri Slaby { 17364cdd17baSJiri Slaby struct uart_driver *drv = driver->driver_state; 17374cdd17baSJiri Slaby struct uart_state *state = drv->state + tty->index; 17384cdd17baSJiri Slaby 17394cdd17baSJiri Slaby tty->driver_data = state; 17404cdd17baSJiri Slaby 17414cdd17baSJiri Slaby return tty_standard_install(driver, tty); 17424cdd17baSJiri Slaby } 17434cdd17baSJiri Slaby 1744ab4382d2SGreg Kroah-Hartman /* 1745ef4f527cSKevin Cernekee * Calls to uart_open are serialised by the tty_lock in 1746ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:tty_open() 1747ab4382d2SGreg Kroah-Hartman * Note that if this fails, then uart_close() _will_ be called. 1748ab4382d2SGreg Kroah-Hartman * 1749ab4382d2SGreg Kroah-Hartman * In time, we want to scrap the "opening nonpresent ports" 1750ab4382d2SGreg Kroah-Hartman * behaviour and implement an alternative way for setserial 1751ab4382d2SGreg Kroah-Hartman * to set base addresses/ports/types. This will allow us to 1752ab4382d2SGreg Kroah-Hartman * get rid of a certain amount of extra tests. 1753ab4382d2SGreg Kroah-Hartman */ 1754ab4382d2SGreg Kroah-Hartman static int uart_open(struct tty_struct *tty, struct file *filp) 1755ab4382d2SGreg Kroah-Hartman { 17564cdd17baSJiri Slaby struct uart_state *state = tty->driver_data; 17574cdd17baSJiri Slaby int retval; 1758b3b57646SRob Herring 1759b3b57646SRob Herring retval = tty_port_open(&state->port, tty, filp); 1760b3b57646SRob Herring if (retval > 0) 1761b3b57646SRob Herring retval = 0; 1762b3b57646SRob Herring 1763b3b57646SRob Herring return retval; 1764b3b57646SRob Herring } 1765b3b57646SRob Herring 1766b3b57646SRob Herring static int uart_port_activate(struct tty_port *port, struct tty_struct *tty) 1767b3b57646SRob Herring { 1768b3b57646SRob Herring struct uart_state *state = container_of(port, struct uart_state, port); 1769b3b57646SRob Herring struct uart_port *uport; 177013b18d35SSerge Semin int ret; 1771b3b57646SRob Herring 1772b3b57646SRob Herring uport = uart_port_check(state); 1773b3b57646SRob Herring if (!uport || uport->flags & UPF_DEAD) 1774b3b57646SRob Herring return -ENXIO; 1775b3b57646SRob Herring 1776ab4382d2SGreg Kroah-Hartman /* 1777ab4382d2SGreg Kroah-Hartman * Start up the serial port. 1778ab4382d2SGreg Kroah-Hartman */ 177913b18d35SSerge Semin ret = uart_startup(tty, state, 0); 178013b18d35SSerge Semin if (ret > 0) 178113b18d35SSerge Semin tty_port_set_active(port, 1); 178213b18d35SSerge Semin 178313b18d35SSerge Semin return ret; 1784ab4382d2SGreg Kroah-Hartman } 1785ab4382d2SGreg Kroah-Hartman 1786ab4382d2SGreg Kroah-Hartman static const char *uart_type(struct uart_port *port) 1787ab4382d2SGreg Kroah-Hartman { 1788ab4382d2SGreg Kroah-Hartman const char *str = NULL; 1789ab4382d2SGreg Kroah-Hartman 1790ab4382d2SGreg Kroah-Hartman if (port->ops->type) 1791ab4382d2SGreg Kroah-Hartman str = port->ops->type(port); 1792ab4382d2SGreg Kroah-Hartman 1793ab4382d2SGreg Kroah-Hartman if (!str) 1794ab4382d2SGreg Kroah-Hartman str = "unknown"; 1795ab4382d2SGreg Kroah-Hartman 1796ab4382d2SGreg Kroah-Hartman return str; 1797ab4382d2SGreg Kroah-Hartman } 1798ab4382d2SGreg Kroah-Hartman 1799ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_PROC_FS 1800ab4382d2SGreg Kroah-Hartman 1801ab4382d2SGreg Kroah-Hartman static void uart_line_info(struct seq_file *m, struct uart_driver *drv, int i) 1802ab4382d2SGreg Kroah-Hartman { 1803ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + i; 1804ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 18056f538fe3SLinus Walleij enum uart_pm_state pm_state; 18064047b371SPeter Hurley struct uart_port *uport; 1807ab4382d2SGreg Kroah-Hartman char stat_buf[32]; 1808ab4382d2SGreg Kroah-Hartman unsigned int status; 1809ab4382d2SGreg Kroah-Hartman int mmio; 1810ab4382d2SGreg Kroah-Hartman 18114047b371SPeter Hurley mutex_lock(&port->mutex); 18124047b371SPeter Hurley uport = uart_port_check(state); 1813ab4382d2SGreg Kroah-Hartman if (!uport) 18144047b371SPeter Hurley goto out; 1815ab4382d2SGreg Kroah-Hartman 1816ab4382d2SGreg Kroah-Hartman mmio = uport->iotype >= UPIO_MEM; 1817ab4382d2SGreg Kroah-Hartman seq_printf(m, "%d: uart:%s %s%08llX irq:%d", 1818ab4382d2SGreg Kroah-Hartman uport->line, uart_type(uport), 1819ab4382d2SGreg Kroah-Hartman mmio ? "mmio:0x" : "port:", 1820ab4382d2SGreg Kroah-Hartman mmio ? (unsigned long long)uport->mapbase 1821ab4382d2SGreg Kroah-Hartman : (unsigned long long)uport->iobase, 1822ab4382d2SGreg Kroah-Hartman uport->irq); 1823ab4382d2SGreg Kroah-Hartman 1824ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) { 1825ab4382d2SGreg Kroah-Hartman seq_putc(m, '\n'); 18264047b371SPeter Hurley goto out; 1827ab4382d2SGreg Kroah-Hartman } 1828ab4382d2SGreg Kroah-Hartman 1829ab4382d2SGreg Kroah-Hartman if (capable(CAP_SYS_ADMIN)) { 1830ab4382d2SGreg Kroah-Hartman pm_state = state->pm_state; 18316f538fe3SLinus Walleij if (pm_state != UART_PM_STATE_ON) 18326f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 1833ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1834ab4382d2SGreg Kroah-Hartman status = uport->ops->get_mctrl(uport); 1835ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 18366f538fe3SLinus Walleij if (pm_state != UART_PM_STATE_ON) 1837ab4382d2SGreg Kroah-Hartman uart_change_pm(state, pm_state); 1838ab4382d2SGreg Kroah-Hartman 1839ab4382d2SGreg Kroah-Hartman seq_printf(m, " tx:%d rx:%d", 1840ab4382d2SGreg Kroah-Hartman uport->icount.tx, uport->icount.rx); 1841ab4382d2SGreg Kroah-Hartman if (uport->icount.frame) 1842968af298SPeter Hurley seq_printf(m, " fe:%d", uport->icount.frame); 1843ab4382d2SGreg Kroah-Hartman if (uport->icount.parity) 1844968af298SPeter Hurley seq_printf(m, " pe:%d", uport->icount.parity); 1845ab4382d2SGreg Kroah-Hartman if (uport->icount.brk) 1846968af298SPeter Hurley seq_printf(m, " brk:%d", uport->icount.brk); 1847ab4382d2SGreg Kroah-Hartman if (uport->icount.overrun) 1848968af298SPeter Hurley seq_printf(m, " oe:%d", uport->icount.overrun); 18494f794097SJeremy Kerr if (uport->icount.buf_overrun) 18504f794097SJeremy Kerr seq_printf(m, " bo:%d", uport->icount.buf_overrun); 1851ab4382d2SGreg Kroah-Hartman 1852ab4382d2SGreg Kroah-Hartman #define INFOBIT(bit, str) \ 1853ab4382d2SGreg Kroah-Hartman if (uport->mctrl & (bit)) \ 1854ab4382d2SGreg Kroah-Hartman strncat(stat_buf, (str), sizeof(stat_buf) - \ 1855ab4382d2SGreg Kroah-Hartman strlen(stat_buf) - 2) 1856ab4382d2SGreg Kroah-Hartman #define STATBIT(bit, str) \ 1857ab4382d2SGreg Kroah-Hartman if (status & (bit)) \ 1858ab4382d2SGreg Kroah-Hartman strncat(stat_buf, (str), sizeof(stat_buf) - \ 1859ab4382d2SGreg Kroah-Hartman strlen(stat_buf) - 2) 1860ab4382d2SGreg Kroah-Hartman 1861ab4382d2SGreg Kroah-Hartman stat_buf[0] = '\0'; 1862ab4382d2SGreg Kroah-Hartman stat_buf[1] = '\0'; 1863ab4382d2SGreg Kroah-Hartman INFOBIT(TIOCM_RTS, "|RTS"); 1864ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_CTS, "|CTS"); 1865ab4382d2SGreg Kroah-Hartman INFOBIT(TIOCM_DTR, "|DTR"); 1866ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_DSR, "|DSR"); 1867ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_CAR, "|CD"); 1868ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_RNG, "|RI"); 1869ab4382d2SGreg Kroah-Hartman if (stat_buf[0]) 1870ab4382d2SGreg Kroah-Hartman stat_buf[0] = ' '; 1871ab4382d2SGreg Kroah-Hartman 1872ab4382d2SGreg Kroah-Hartman seq_puts(m, stat_buf); 1873ab4382d2SGreg Kroah-Hartman } 1874ab4382d2SGreg Kroah-Hartman seq_putc(m, '\n'); 1875ab4382d2SGreg Kroah-Hartman #undef STATBIT 1876ab4382d2SGreg Kroah-Hartman #undef INFOBIT 18774047b371SPeter Hurley out: 18784047b371SPeter Hurley mutex_unlock(&port->mutex); 1879ab4382d2SGreg Kroah-Hartman } 1880ab4382d2SGreg Kroah-Hartman 1881ab4382d2SGreg Kroah-Hartman static int uart_proc_show(struct seq_file *m, void *v) 1882ab4382d2SGreg Kroah-Hartman { 1883ab4382d2SGreg Kroah-Hartman struct tty_driver *ttydrv = m->private; 1884ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = ttydrv->driver_state; 1885ab4382d2SGreg Kroah-Hartman int i; 1886ab4382d2SGreg Kroah-Hartman 1887968af298SPeter Hurley seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n", "", "", ""); 1888ab4382d2SGreg Kroah-Hartman for (i = 0; i < drv->nr; i++) 1889ab4382d2SGreg Kroah-Hartman uart_line_info(m, drv, i); 1890ab4382d2SGreg Kroah-Hartman return 0; 1891ab4382d2SGreg Kroah-Hartman } 1892ab4382d2SGreg Kroah-Hartman #endif 1893ab4382d2SGreg Kroah-Hartman 18947a49955aSAndy Shevchenko static inline bool uart_console_enabled(struct uart_port *port) 18957a49955aSAndy Shevchenko { 18967a49955aSAndy Shevchenko return uart_console(port) && (port->cons->flags & CON_ENABLED); 18977a49955aSAndy Shevchenko } 18987a49955aSAndy Shevchenko 1899e0830dbfSJohan Hovold static void uart_port_spin_lock_init(struct uart_port *port) 1900f743061aSAndy Shevchenko { 1901f743061aSAndy Shevchenko spin_lock_init(&port->lock); 1902f743061aSAndy Shevchenko lockdep_set_class(&port->lock, &port_lock_key); 1903f743061aSAndy Shevchenko } 1904f743061aSAndy Shevchenko 1905ab4382d2SGreg Kroah-Hartman #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL) 19061cfe42b7SPeter Hurley /** 1907ab4382d2SGreg Kroah-Hartman * uart_console_write - write a console message to a serial port 1908ab4382d2SGreg Kroah-Hartman * @port: the port to write the message 1909ab4382d2SGreg Kroah-Hartman * @s: array of characters 1910ab4382d2SGreg Kroah-Hartman * @count: number of characters in string to write 191110afbe34SPeter Hurley * @putchar: function to write character to port 1912ab4382d2SGreg Kroah-Hartman */ 1913ab4382d2SGreg Kroah-Hartman void uart_console_write(struct uart_port *port, const char *s, 1914ab4382d2SGreg Kroah-Hartman unsigned int count, 1915ab4382d2SGreg Kroah-Hartman void (*putchar)(struct uart_port *, int)) 1916ab4382d2SGreg Kroah-Hartman { 1917ab4382d2SGreg Kroah-Hartman unsigned int i; 1918ab4382d2SGreg Kroah-Hartman 1919ab4382d2SGreg Kroah-Hartman for (i = 0; i < count; i++, s++) { 1920ab4382d2SGreg Kroah-Hartman if (*s == '\n') 1921ab4382d2SGreg Kroah-Hartman putchar(port, '\r'); 1922ab4382d2SGreg Kroah-Hartman putchar(port, *s); 1923ab4382d2SGreg Kroah-Hartman } 1924ab4382d2SGreg Kroah-Hartman } 1925ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_console_write); 1926ab4382d2SGreg Kroah-Hartman 1927ab4382d2SGreg Kroah-Hartman /* 1928ab4382d2SGreg Kroah-Hartman * Check whether an invalid uart number has been specified, and 1929ab4382d2SGreg Kroah-Hartman * if so, search for the first available port that does have 1930ab4382d2SGreg Kroah-Hartman * console support. 1931ab4382d2SGreg Kroah-Hartman */ 1932ab4382d2SGreg Kroah-Hartman struct uart_port * __init 1933ab4382d2SGreg Kroah-Hartman uart_get_console(struct uart_port *ports, int nr, struct console *co) 1934ab4382d2SGreg Kroah-Hartman { 1935ab4382d2SGreg Kroah-Hartman int idx = co->index; 1936ab4382d2SGreg Kroah-Hartman 1937ab4382d2SGreg Kroah-Hartman if (idx < 0 || idx >= nr || (ports[idx].iobase == 0 && 1938ab4382d2SGreg Kroah-Hartman ports[idx].membase == NULL)) 1939ab4382d2SGreg Kroah-Hartman for (idx = 0; idx < nr; idx++) 1940ab4382d2SGreg Kroah-Hartman if (ports[idx].iobase != 0 || 1941ab4382d2SGreg Kroah-Hartman ports[idx].membase != NULL) 1942ab4382d2SGreg Kroah-Hartman break; 1943ab4382d2SGreg Kroah-Hartman 1944ab4382d2SGreg Kroah-Hartman co->index = idx; 1945ab4382d2SGreg Kroah-Hartman 1946ab4382d2SGreg Kroah-Hartman return ports + idx; 1947ab4382d2SGreg Kroah-Hartman } 1948ab4382d2SGreg Kroah-Hartman 1949ab4382d2SGreg Kroah-Hartman /** 195073abaf87SPeter Hurley * uart_parse_earlycon - Parse earlycon options 195173abaf87SPeter Hurley * @p: ptr to 2nd field (ie., just beyond '<name>,') 195273abaf87SPeter Hurley * @iotype: ptr for decoded iotype (out) 195373abaf87SPeter Hurley * @addr: ptr for decoded mapbase/iobase (out) 195473abaf87SPeter Hurley * @options: ptr for <options> field; NULL if not present (out) 195573abaf87SPeter Hurley * 195673abaf87SPeter Hurley * Decodes earlycon kernel command line parameters of the form 1957bd94c407SMasahiro Yamada * earlycon=<name>,io|mmio|mmio16|mmio32|mmio32be|mmio32native,<addr>,<options> 1958bd94c407SMasahiro Yamada * console=<name>,io|mmio|mmio16|mmio32|mmio32be|mmio32native,<addr>,<options> 195973abaf87SPeter Hurley * 196073abaf87SPeter Hurley * The optional form 1961ff30283aSRandy Dunlap * 196273abaf87SPeter Hurley * earlycon=<name>,0x<addr>,<options> 196373abaf87SPeter Hurley * console=<name>,0x<addr>,<options> 1964ff30283aSRandy Dunlap * 196573abaf87SPeter Hurley * is also accepted; the returned @iotype will be UPIO_MEM. 196673abaf87SPeter Hurley * 19678b2303deSAlexander Sverdlin * Returns 0 on success or -EINVAL on failure 196873abaf87SPeter Hurley */ 196946e36683SAlexander Sverdlin int uart_parse_earlycon(char *p, unsigned char *iotype, resource_size_t *addr, 197073abaf87SPeter Hurley char **options) 197173abaf87SPeter Hurley { 197273abaf87SPeter Hurley if (strncmp(p, "mmio,", 5) == 0) { 197373abaf87SPeter Hurley *iotype = UPIO_MEM; 197473abaf87SPeter Hurley p += 5; 1975bd94c407SMasahiro Yamada } else if (strncmp(p, "mmio16,", 7) == 0) { 1976bd94c407SMasahiro Yamada *iotype = UPIO_MEM16; 1977bd94c407SMasahiro Yamada p += 7; 197873abaf87SPeter Hurley } else if (strncmp(p, "mmio32,", 7) == 0) { 197973abaf87SPeter Hurley *iotype = UPIO_MEM32; 198073abaf87SPeter Hurley p += 7; 19816e63be3fSNoam Camus } else if (strncmp(p, "mmio32be,", 9) == 0) { 19826e63be3fSNoam Camus *iotype = UPIO_MEM32BE; 19836e63be3fSNoam Camus p += 9; 1984d215d809SMax Filippov } else if (strncmp(p, "mmio32native,", 13) == 0) { 1985d215d809SMax Filippov *iotype = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) ? 1986d215d809SMax Filippov UPIO_MEM32BE : UPIO_MEM32; 1987d215d809SMax Filippov p += 13; 198873abaf87SPeter Hurley } else if (strncmp(p, "io,", 3) == 0) { 198973abaf87SPeter Hurley *iotype = UPIO_PORT; 199073abaf87SPeter Hurley p += 3; 199173abaf87SPeter Hurley } else if (strncmp(p, "0x", 2) == 0) { 199273abaf87SPeter Hurley *iotype = UPIO_MEM; 199373abaf87SPeter Hurley } else { 199473abaf87SPeter Hurley return -EINVAL; 199573abaf87SPeter Hurley } 199673abaf87SPeter Hurley 19978b2303deSAlexander Sverdlin /* 19988b2303deSAlexander Sverdlin * Before you replace it with kstrtoull(), think about options separator 19998b2303deSAlexander Sverdlin * (',') it will not tolerate 20008b2303deSAlexander Sverdlin */ 20018b2303deSAlexander Sverdlin *addr = simple_strtoull(p, NULL, 0); 200273abaf87SPeter Hurley p = strchr(p, ','); 200373abaf87SPeter Hurley if (p) 200473abaf87SPeter Hurley p++; 200573abaf87SPeter Hurley 200673abaf87SPeter Hurley *options = p; 200773abaf87SPeter Hurley return 0; 200873abaf87SPeter Hurley } 200973abaf87SPeter Hurley EXPORT_SYMBOL_GPL(uart_parse_earlycon); 201073abaf87SPeter Hurley 201173abaf87SPeter Hurley /** 201202088ca6SGeert Uytterhoeven * uart_parse_options - Parse serial port baud/parity/bits/flow control. 2013ab4382d2SGreg Kroah-Hartman * @options: pointer to option string 2014ab4382d2SGreg Kroah-Hartman * @baud: pointer to an 'int' variable for the baud rate. 2015ab4382d2SGreg Kroah-Hartman * @parity: pointer to an 'int' variable for the parity. 2016ab4382d2SGreg Kroah-Hartman * @bits: pointer to an 'int' variable for the number of data bits. 2017ab4382d2SGreg Kroah-Hartman * @flow: pointer to an 'int' variable for the flow control character. 2018ab4382d2SGreg Kroah-Hartman * 2019ab4382d2SGreg Kroah-Hartman * uart_parse_options decodes a string containing the serial console 2020ab4382d2SGreg Kroah-Hartman * options. The format of the string is <baud><parity><bits><flow>, 2021ab4382d2SGreg Kroah-Hartman * eg: 115200n8r 2022ab4382d2SGreg Kroah-Hartman */ 2023ab4382d2SGreg Kroah-Hartman void 20240f646b63SPaul Cercueil uart_parse_options(const char *options, int *baud, int *parity, 20250f646b63SPaul Cercueil int *bits, int *flow) 2026ab4382d2SGreg Kroah-Hartman { 20270f646b63SPaul Cercueil const char *s = options; 2028ab4382d2SGreg Kroah-Hartman 2029ab4382d2SGreg Kroah-Hartman *baud = simple_strtoul(s, NULL, 10); 2030ab4382d2SGreg Kroah-Hartman while (*s >= '0' && *s <= '9') 2031ab4382d2SGreg Kroah-Hartman s++; 2032ab4382d2SGreg Kroah-Hartman if (*s) 2033ab4382d2SGreg Kroah-Hartman *parity = *s++; 2034ab4382d2SGreg Kroah-Hartman if (*s) 2035ab4382d2SGreg Kroah-Hartman *bits = *s++ - '0'; 2036ab4382d2SGreg Kroah-Hartman if (*s) 2037ab4382d2SGreg Kroah-Hartman *flow = *s; 2038ab4382d2SGreg Kroah-Hartman } 2039ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_parse_options); 2040ab4382d2SGreg Kroah-Hartman 2041ab4382d2SGreg Kroah-Hartman /** 2042ab4382d2SGreg Kroah-Hartman * uart_set_options - setup the serial console parameters 2043ab4382d2SGreg Kroah-Hartman * @port: pointer to the serial ports uart_port structure 2044ab4382d2SGreg Kroah-Hartman * @co: console pointer 2045ab4382d2SGreg Kroah-Hartman * @baud: baud rate 2046ab4382d2SGreg Kroah-Hartman * @parity: parity character - 'n' (none), 'o' (odd), 'e' (even) 2047ab4382d2SGreg Kroah-Hartman * @bits: number of data bits 2048ab4382d2SGreg Kroah-Hartman * @flow: flow control character - 'r' (rts) 2049ab4382d2SGreg Kroah-Hartman */ 2050ab4382d2SGreg Kroah-Hartman int 2051ab4382d2SGreg Kroah-Hartman uart_set_options(struct uart_port *port, struct console *co, 2052ab4382d2SGreg Kroah-Hartman int baud, int parity, int bits, int flow) 2053ab4382d2SGreg Kroah-Hartman { 2054ab4382d2SGreg Kroah-Hartman struct ktermios termios; 2055ab4382d2SGreg Kroah-Hartman static struct ktermios dummy; 2056ab4382d2SGreg Kroah-Hartman 2057e0830dbfSJohan Hovold /* 2058e0830dbfSJohan Hovold * Ensure that the serial-console lock is initialised early. 2059e0830dbfSJohan Hovold * 2060e0830dbfSJohan Hovold * Note that the console-enabled check is needed because of kgdboc, 2061e0830dbfSJohan Hovold * which can end up calling uart_set_options() for an already enabled 2062e0830dbfSJohan Hovold * console via tty_find_polling_driver() and uart_poll_init(). 2063e0830dbfSJohan Hovold */ 2064e0830dbfSJohan Hovold if (!uart_console_enabled(port) && !port->console_reinit) 2065d2403cadSAndy Shevchenko uart_port_spin_lock_init(port); 2066ab4382d2SGreg Kroah-Hartman 2067ab4382d2SGreg Kroah-Hartman memset(&termios, 0, sizeof(struct ktermios)); 2068ab4382d2SGreg Kroah-Hartman 2069ba47f97aSJeffy Chen termios.c_cflag |= CREAD | HUPCL | CLOCAL; 2070ba47f97aSJeffy Chen tty_termios_encode_baud_rate(&termios, baud, baud); 2071ab4382d2SGreg Kroah-Hartman 2072ab4382d2SGreg Kroah-Hartman if (bits == 7) 2073ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CS7; 2074ab4382d2SGreg Kroah-Hartman else 2075ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CS8; 2076ab4382d2SGreg Kroah-Hartman 2077ab4382d2SGreg Kroah-Hartman switch (parity) { 2078ab4382d2SGreg Kroah-Hartman case 'o': case 'O': 2079ab4382d2SGreg Kroah-Hartman termios.c_cflag |= PARODD; 2080df561f66SGustavo A. R. Silva fallthrough; 2081ab4382d2SGreg Kroah-Hartman case 'e': case 'E': 2082ab4382d2SGreg Kroah-Hartman termios.c_cflag |= PARENB; 2083ab4382d2SGreg Kroah-Hartman break; 2084ab4382d2SGreg Kroah-Hartman } 2085ab4382d2SGreg Kroah-Hartman 2086ab4382d2SGreg Kroah-Hartman if (flow == 'r') 2087ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CRTSCTS; 2088ab4382d2SGreg Kroah-Hartman 2089ab4382d2SGreg Kroah-Hartman /* 2090ab4382d2SGreg Kroah-Hartman * some uarts on other side don't support no flow control. 2091ab4382d2SGreg Kroah-Hartman * So we set * DTR in host uart to make them happy 2092ab4382d2SGreg Kroah-Hartman */ 2093ab4382d2SGreg Kroah-Hartman port->mctrl |= TIOCM_DTR; 2094ab4382d2SGreg Kroah-Hartman 2095ab4382d2SGreg Kroah-Hartman port->ops->set_termios(port, &termios, &dummy); 2096ab4382d2SGreg Kroah-Hartman /* 2097ab4382d2SGreg Kroah-Hartman * Allow the setting of the UART parameters with a NULL console 2098ab4382d2SGreg Kroah-Hartman * too: 2099ab4382d2SGreg Kroah-Hartman */ 2100027b5717SPali Rohár if (co) { 2101ab4382d2SGreg Kroah-Hartman co->cflag = termios.c_cflag; 2102027b5717SPali Rohár co->ispeed = termios.c_ispeed; 2103027b5717SPali Rohár co->ospeed = termios.c_ospeed; 2104027b5717SPali Rohár } 2105ab4382d2SGreg Kroah-Hartman 2106ab4382d2SGreg Kroah-Hartman return 0; 2107ab4382d2SGreg Kroah-Hartman } 2108ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_set_options); 2109ab4382d2SGreg Kroah-Hartman #endif /* CONFIG_SERIAL_CORE_CONSOLE */ 2110ab4382d2SGreg Kroah-Hartman 2111cf75525fSJiri Slaby /** 2112cf75525fSJiri Slaby * uart_change_pm - set power state of the port 2113cf75525fSJiri Slaby * 2114cf75525fSJiri Slaby * @state: port descriptor 2115cf75525fSJiri Slaby * @pm_state: new state 2116cf75525fSJiri Slaby * 2117cf75525fSJiri Slaby * Locking: port->mutex has to be held 2118cf75525fSJiri Slaby */ 21196f538fe3SLinus Walleij static void uart_change_pm(struct uart_state *state, 21206f538fe3SLinus Walleij enum uart_pm_state pm_state) 2121ab4382d2SGreg Kroah-Hartman { 21224047b371SPeter Hurley struct uart_port *port = uart_port_check(state); 2123ab4382d2SGreg Kroah-Hartman 2124ab4382d2SGreg Kroah-Hartman if (state->pm_state != pm_state) { 21254047b371SPeter Hurley if (port && port->ops->pm) 2126ab4382d2SGreg Kroah-Hartman port->ops->pm(port, pm_state, state->pm_state); 2127ab4382d2SGreg Kroah-Hartman state->pm_state = pm_state; 2128ab4382d2SGreg Kroah-Hartman } 2129ab4382d2SGreg Kroah-Hartman } 2130ab4382d2SGreg Kroah-Hartman 2131ab4382d2SGreg Kroah-Hartman struct uart_match { 2132ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2133ab4382d2SGreg Kroah-Hartman struct uart_driver *driver; 2134ab4382d2SGreg Kroah-Hartman }; 2135ab4382d2SGreg Kroah-Hartman 2136ab4382d2SGreg Kroah-Hartman static int serial_match_port(struct device *dev, void *data) 2137ab4382d2SGreg Kroah-Hartman { 2138ab4382d2SGreg Kroah-Hartman struct uart_match *match = data; 2139ab4382d2SGreg Kroah-Hartman struct tty_driver *tty_drv = match->driver->tty_driver; 2140ab4382d2SGreg Kroah-Hartman dev_t devt = MKDEV(tty_drv->major, tty_drv->minor_start) + 2141ab4382d2SGreg Kroah-Hartman match->port->line; 2142ab4382d2SGreg Kroah-Hartman 2143ab4382d2SGreg Kroah-Hartman return dev->devt == devt; /* Actually, only one tty per port */ 2144ab4382d2SGreg Kroah-Hartman } 2145ab4382d2SGreg Kroah-Hartman 2146ab4382d2SGreg Kroah-Hartman int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport) 2147ab4382d2SGreg Kroah-Hartman { 2148ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 2149ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2150ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 2151ab4382d2SGreg Kroah-Hartman struct uart_match match = {uport, drv}; 2152ab4382d2SGreg Kroah-Hartman 2153ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2154ab4382d2SGreg Kroah-Hartman 2155ab4382d2SGreg Kroah-Hartman tty_dev = device_find_child(uport->dev, &match, serial_match_port); 215688e2582eSLucas Stach if (tty_dev && device_may_wakeup(tty_dev)) { 2157aef3ad10SAndy Shevchenko enable_irq_wake(uport->irq); 2158ab4382d2SGreg Kroah-Hartman 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); 21635a65dcc0SFederico Vaga 2164b164c972SPeter Hurley /* Nothing to do if the console is not suspending */ 2165b164c972SPeter Hurley if (!console_suspend_enabled && uart_console(uport)) 2166b164c972SPeter Hurley goto unlock; 2167b164c972SPeter Hurley 2168ab4382d2SGreg Kroah-Hartman uport->suspended = 1; 2169ab4382d2SGreg Kroah-Hartman 2170d41861caSPeter Hurley if (tty_port_initialized(port)) { 2171ab4382d2SGreg Kroah-Hartman const struct uart_ops *ops = uport->ops; 2172ab4382d2SGreg Kroah-Hartman int tries; 2173ab4382d2SGreg Kroah-Hartman 217480f02d54SPeter Hurley tty_port_set_suspended(port, 1); 2175d41861caSPeter Hurley tty_port_set_initialized(port, 0); 2176ab4382d2SGreg Kroah-Hartman 2177ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 2178ab4382d2SGreg Kroah-Hartman ops->stop_tx(uport); 2179ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, 0); 2180ab4382d2SGreg Kroah-Hartman ops->stop_rx(uport); 2181ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2182ab4382d2SGreg Kroah-Hartman 2183ab4382d2SGreg Kroah-Hartman /* 2184ab4382d2SGreg Kroah-Hartman * Wait for the transmitter to empty. 2185ab4382d2SGreg Kroah-Hartman */ 2186ab4382d2SGreg Kroah-Hartman for (tries = 3; !ops->tx_empty(uport) && tries; tries--) 2187ab4382d2SGreg Kroah-Hartman msleep(10); 2188ab4382d2SGreg Kroah-Hartman if (!tries) 2189cade3580SAndy Shevchenko dev_err(uport->dev, "%s: Unable to drain transmitter\n", 2190cade3580SAndy Shevchenko uport->name); 2191ab4382d2SGreg Kroah-Hartman 2192ab4382d2SGreg Kroah-Hartman ops->shutdown(uport); 2193ab4382d2SGreg Kroah-Hartman } 2194ab4382d2SGreg Kroah-Hartman 2195ab4382d2SGreg Kroah-Hartman /* 2196ab4382d2SGreg Kroah-Hartman * Disable the console device before suspending. 2197ab4382d2SGreg Kroah-Hartman */ 2198b164c972SPeter Hurley if (uart_console(uport)) 2199ab4382d2SGreg Kroah-Hartman console_stop(uport->cons); 2200ab4382d2SGreg Kroah-Hartman 22016f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_OFF); 2202b164c972SPeter Hurley unlock: 2203ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2204ab4382d2SGreg Kroah-Hartman 2205ab4382d2SGreg Kroah-Hartman return 0; 2206ab4382d2SGreg Kroah-Hartman } 2207ab4382d2SGreg Kroah-Hartman 2208ab4382d2SGreg Kroah-Hartman int uart_resume_port(struct uart_driver *drv, struct uart_port *uport) 2209ab4382d2SGreg Kroah-Hartman { 2210ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 2211ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2212ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 2213ab4382d2SGreg Kroah-Hartman struct uart_match match = {uport, drv}; 2214ab4382d2SGreg Kroah-Hartman struct ktermios termios; 2215ab4382d2SGreg Kroah-Hartman 2216ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2217ab4382d2SGreg Kroah-Hartman 2218ab4382d2SGreg Kroah-Hartman tty_dev = device_find_child(uport->dev, &match, serial_match_port); 2219ab4382d2SGreg Kroah-Hartman if (!uport->suspended && device_may_wakeup(tty_dev)) { 2220aef3ad10SAndy Shevchenko if (irqd_is_wakeup_set(irq_get_irq_data((uport->irq)))) 2221ab4382d2SGreg Kroah-Hartman disable_irq_wake(uport->irq); 22225a65dcc0SFederico Vaga put_device(tty_dev); 2223ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2224ab4382d2SGreg Kroah-Hartman return 0; 2225ab4382d2SGreg Kroah-Hartman } 22265a65dcc0SFederico Vaga put_device(tty_dev); 2227ab4382d2SGreg Kroah-Hartman uport->suspended = 0; 2228ab4382d2SGreg Kroah-Hartman 2229ab4382d2SGreg Kroah-Hartman /* 2230ab4382d2SGreg Kroah-Hartman * Re-enable the console device after suspending. 2231ab4382d2SGreg Kroah-Hartman */ 22325933a161SYin Kangkai if (uart_console(uport)) { 2233ab4382d2SGreg Kroah-Hartman /* 2234ab4382d2SGreg Kroah-Hartman * First try to use the console cflag setting. 2235ab4382d2SGreg Kroah-Hartman */ 2236ab4382d2SGreg Kroah-Hartman memset(&termios, 0, sizeof(struct ktermios)); 2237ab4382d2SGreg Kroah-Hartman termios.c_cflag = uport->cons->cflag; 2238027b5717SPali Rohár termios.c_ispeed = uport->cons->ispeed; 2239027b5717SPali Rohár termios.c_ospeed = uport->cons->ospeed; 2240ab4382d2SGreg Kroah-Hartman 2241ab4382d2SGreg Kroah-Hartman /* 2242ab4382d2SGreg Kroah-Hartman * If that's unset, use the tty termios setting. 2243ab4382d2SGreg Kroah-Hartman */ 2244adc8d746SAlan Cox if (port->tty && termios.c_cflag == 0) 2245adc8d746SAlan Cox termios = port->tty->termios; 2246ab4382d2SGreg Kroah-Hartman 224794abc56fSNing Jiang if (console_suspend_enabled) 22486f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2249ab4382d2SGreg Kroah-Hartman uport->ops->set_termios(uport, &termios, NULL); 22505933a161SYin Kangkai if (console_suspend_enabled) 2251ab4382d2SGreg Kroah-Hartman console_start(uport->cons); 2252ab4382d2SGreg Kroah-Hartman } 2253ab4382d2SGreg Kroah-Hartman 225480f02d54SPeter Hurley if (tty_port_suspended(port)) { 2255ab4382d2SGreg Kroah-Hartman const struct uart_ops *ops = uport->ops; 2256ab4382d2SGreg Kroah-Hartman int ret; 2257ab4382d2SGreg Kroah-Hartman 22586f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2259ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 2260ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, 0); 2261ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2262ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) { 2263ab4382d2SGreg Kroah-Hartman /* Protected by port mutex for now */ 2264ab4382d2SGreg Kroah-Hartman struct tty_struct *tty = port->tty; 22654ed71addSTamseel Shams 2266ab4382d2SGreg Kroah-Hartman ret = ops->startup(uport); 2267ab4382d2SGreg Kroah-Hartman if (ret == 0) { 2268ab4382d2SGreg Kroah-Hartman if (tty) 2269ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 2270ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 2271ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, uport->mctrl); 2272ab4382d2SGreg Kroah-Hartman ops->start_tx(uport); 2273ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2274d41861caSPeter Hurley tty_port_set_initialized(port, 1); 2275ab4382d2SGreg Kroah-Hartman } else { 2276ab4382d2SGreg Kroah-Hartman /* 2277ab4382d2SGreg Kroah-Hartman * Failed to resume - maybe hardware went away? 2278ab4382d2SGreg Kroah-Hartman * Clear the "initialized" flag so we won't try 2279ab4382d2SGreg Kroah-Hartman * to call the low level drivers shutdown method. 2280ab4382d2SGreg Kroah-Hartman */ 2281ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 2282ab4382d2SGreg Kroah-Hartman } 2283ab4382d2SGreg Kroah-Hartman } 2284ab4382d2SGreg Kroah-Hartman 228580f02d54SPeter Hurley tty_port_set_suspended(port, 0); 2286ab4382d2SGreg Kroah-Hartman } 2287ab4382d2SGreg Kroah-Hartman 2288ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2289ab4382d2SGreg Kroah-Hartman 2290ab4382d2SGreg Kroah-Hartman return 0; 2291ab4382d2SGreg Kroah-Hartman } 2292ab4382d2SGreg Kroah-Hartman 2293ab4382d2SGreg Kroah-Hartman static inline void 2294ab4382d2SGreg Kroah-Hartman uart_report_port(struct uart_driver *drv, struct uart_port *port) 2295ab4382d2SGreg Kroah-Hartman { 2296ab4382d2SGreg Kroah-Hartman char address[64]; 2297ab4382d2SGreg Kroah-Hartman 2298ab4382d2SGreg Kroah-Hartman switch (port->iotype) { 2299ab4382d2SGreg Kroah-Hartman case UPIO_PORT: 2300ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), "I/O 0x%lx", port->iobase); 2301ab4382d2SGreg Kroah-Hartman break; 2302ab4382d2SGreg Kroah-Hartman case UPIO_HUB6: 2303ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), 2304ab4382d2SGreg Kroah-Hartman "I/O 0x%lx offset 0x%x", port->iobase, port->hub6); 2305ab4382d2SGreg Kroah-Hartman break; 2306ab4382d2SGreg Kroah-Hartman case UPIO_MEM: 2307bd94c407SMasahiro Yamada case UPIO_MEM16: 2308ab4382d2SGreg Kroah-Hartman case UPIO_MEM32: 23093ffb1a81SKevin Cernekee case UPIO_MEM32BE: 2310ab4382d2SGreg Kroah-Hartman case UPIO_AU: 2311ab4382d2SGreg Kroah-Hartman case UPIO_TSI: 2312ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), 2313ab4382d2SGreg Kroah-Hartman "MMIO 0x%llx", (unsigned long long)port->mapbase); 2314ab4382d2SGreg Kroah-Hartman break; 2315ab4382d2SGreg Kroah-Hartman default: 2316ab4382d2SGreg Kroah-Hartman strlcpy(address, "*unknown*", sizeof(address)); 2317ab4382d2SGreg Kroah-Hartman break; 2318ab4382d2SGreg Kroah-Hartman } 2319ab4382d2SGreg Kroah-Hartman 2320cade3580SAndy Shevchenko pr_info("%s%s%s at %s (irq = %d, base_baud = %d) is a %s\n", 232168ed7e1cSJames Bottomley port->dev ? dev_name(port->dev) : "", 232268ed7e1cSJames Bottomley port->dev ? ": " : "", 2323cade3580SAndy Shevchenko port->name, 23247d12b976SKees Cook address, port->irq, port->uartclk / 16, uart_type(port)); 2325e7b91932SMaciej W. Rozycki 2326e7b91932SMaciej W. Rozycki /* The magic multiplier feature is a bit obscure, so report it too. */ 2327e7b91932SMaciej W. Rozycki if (port->flags & UPF_MAGIC_MULTIPLIER) 2328e7b91932SMaciej W. Rozycki pr_info("%s%s%s extra baud rates supported: %d, %d", 2329e7b91932SMaciej W. Rozycki port->dev ? dev_name(port->dev) : "", 2330e7b91932SMaciej W. Rozycki port->dev ? ": " : "", 2331e7b91932SMaciej W. Rozycki port->name, 2332e7b91932SMaciej W. Rozycki port->uartclk / 8, port->uartclk / 4); 2333ab4382d2SGreg Kroah-Hartman } 2334ab4382d2SGreg Kroah-Hartman 2335ab4382d2SGreg Kroah-Hartman static void 2336ab4382d2SGreg Kroah-Hartman uart_configure_port(struct uart_driver *drv, struct uart_state *state, 2337ab4382d2SGreg Kroah-Hartman struct uart_port *port) 2338ab4382d2SGreg Kroah-Hartman { 2339ab4382d2SGreg Kroah-Hartman unsigned int flags; 2340ab4382d2SGreg Kroah-Hartman 2341ab4382d2SGreg Kroah-Hartman /* 2342ab4382d2SGreg Kroah-Hartman * If there isn't a port here, don't do anything further. 2343ab4382d2SGreg Kroah-Hartman */ 2344ab4382d2SGreg Kroah-Hartman if (!port->iobase && !port->mapbase && !port->membase) 2345ab4382d2SGreg Kroah-Hartman return; 2346ab4382d2SGreg Kroah-Hartman 2347ab4382d2SGreg Kroah-Hartman /* 2348ab4382d2SGreg Kroah-Hartman * Now do the auto configuration stuff. Note that config_port 2349ab4382d2SGreg Kroah-Hartman * is expected to claim the resources and map the port for us. 2350ab4382d2SGreg Kroah-Hartman */ 2351ab4382d2SGreg Kroah-Hartman flags = 0; 2352ab4382d2SGreg Kroah-Hartman if (port->flags & UPF_AUTO_IRQ) 2353ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_IRQ; 2354ab4382d2SGreg Kroah-Hartman if (port->flags & UPF_BOOT_AUTOCONF) { 2355ab4382d2SGreg Kroah-Hartman if (!(port->flags & UPF_FIXED_TYPE)) { 2356ab4382d2SGreg Kroah-Hartman port->type = PORT_UNKNOWN; 2357ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_TYPE; 2358ab4382d2SGreg Kroah-Hartman } 2359ab4382d2SGreg Kroah-Hartman port->ops->config_port(port, flags); 2360ab4382d2SGreg Kroah-Hartman } 2361ab4382d2SGreg Kroah-Hartman 2362ab4382d2SGreg Kroah-Hartman if (port->type != PORT_UNKNOWN) { 2363ab4382d2SGreg Kroah-Hartman unsigned long flags; 2364ab4382d2SGreg Kroah-Hartman 2365ab4382d2SGreg Kroah-Hartman uart_report_port(drv, port); 2366ab4382d2SGreg Kroah-Hartman 2367ab4382d2SGreg Kroah-Hartman /* Power up port for set_mctrl() */ 23686f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2369ab4382d2SGreg Kroah-Hartman 2370ab4382d2SGreg Kroah-Hartman /* 2371ab4382d2SGreg Kroah-Hartman * Ensure that the modem control lines are de-activated. 2372ab4382d2SGreg Kroah-Hartman * keep the DTR setting that is set in uart_set_options() 2373ab4382d2SGreg Kroah-Hartman * We probably don't need a spinlock around this, but 2374ab4382d2SGreg Kroah-Hartman */ 2375ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 2376ab4382d2SGreg Kroah-Hartman port->ops->set_mctrl(port, port->mctrl & TIOCM_DTR); 2377ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 2378ab4382d2SGreg Kroah-Hartman 2379ab4382d2SGreg Kroah-Hartman /* 2380ab4382d2SGreg Kroah-Hartman * If this driver supports console, and it hasn't been 2381ab4382d2SGreg Kroah-Hartman * successfully registered yet, try to re-register it. 2382ab4382d2SGreg Kroah-Hartman * It may be that the port was not available. 2383ab4382d2SGreg Kroah-Hartman */ 2384ab4382d2SGreg Kroah-Hartman if (port->cons && !(port->cons->flags & CON_ENABLED)) 2385ab4382d2SGreg Kroah-Hartman register_console(port->cons); 2386ab4382d2SGreg Kroah-Hartman 2387ab4382d2SGreg Kroah-Hartman /* 2388ab4382d2SGreg Kroah-Hartman * Power down all ports by default, except the 2389ab4382d2SGreg Kroah-Hartman * console if we have one. 2390ab4382d2SGreg Kroah-Hartman */ 2391ab4382d2SGreg Kroah-Hartman if (!uart_console(port)) 23926f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_OFF); 2393ab4382d2SGreg Kroah-Hartman } 2394ab4382d2SGreg Kroah-Hartman } 2395ab4382d2SGreg Kroah-Hartman 2396ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 2397ab4382d2SGreg Kroah-Hartman 2398ab4382d2SGreg Kroah-Hartman static int uart_poll_init(struct tty_driver *driver, int line, char *options) 2399ab4382d2SGreg Kroah-Hartman { 2400ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2401ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 240249c02304SPeter Hurley struct tty_port *tport; 2403ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2404ab4382d2SGreg Kroah-Hartman int baud = 9600; 2405ab4382d2SGreg Kroah-Hartman int bits = 8; 2406ab4382d2SGreg Kroah-Hartman int parity = 'n'; 2407ab4382d2SGreg Kroah-Hartman int flow = 'n'; 240849c02304SPeter Hurley int ret = 0; 2409ab4382d2SGreg Kroah-Hartman 241049c02304SPeter Hurley tport = &state->port; 241149c02304SPeter Hurley mutex_lock(&tport->mutex); 241249c02304SPeter Hurley 24134047b371SPeter Hurley port = uart_port_check(state); 24144047b371SPeter Hurley if (!port || !(port->ops->poll_get_char && port->ops->poll_put_char)) { 241549c02304SPeter Hurley ret = -1; 241649c02304SPeter Hurley goto out; 241749c02304SPeter Hurley } 2418ab4382d2SGreg Kroah-Hartman 2419c7f3e708SAnton Vorontsov if (port->ops->poll_init) { 2420c7f3e708SAnton Vorontsov /* 2421d41861caSPeter Hurley * We don't set initialized as we only initialized the hw, 2422d41861caSPeter Hurley * e.g. state->xmit is still uninitialized. 2423c7f3e708SAnton Vorontsov */ 2424d41861caSPeter Hurley if (!tty_port_initialized(tport)) 2425c7f3e708SAnton Vorontsov ret = port->ops->poll_init(port); 2426c7f3e708SAnton Vorontsov } 2427c7f3e708SAnton Vorontsov 242849c02304SPeter Hurley if (!ret && options) { 2429ab4382d2SGreg Kroah-Hartman uart_parse_options(options, &baud, &parity, &bits, &flow); 243049c02304SPeter Hurley ret = uart_set_options(port, NULL, baud, parity, bits, flow); 2431ab4382d2SGreg Kroah-Hartman } 243249c02304SPeter Hurley out: 243349c02304SPeter Hurley mutex_unlock(&tport->mutex); 243449c02304SPeter Hurley return ret; 2435ab4382d2SGreg Kroah-Hartman } 2436ab4382d2SGreg Kroah-Hartman 2437ab4382d2SGreg Kroah-Hartman static int uart_poll_get_char(struct tty_driver *driver, int line) 2438ab4382d2SGreg Kroah-Hartman { 2439ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2440ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2441ab4382d2SGreg Kroah-Hartman struct uart_port *port; 24429ed19428SPeter Hurley int ret = -1; 2443ab4382d2SGreg Kroah-Hartman 24449ed19428SPeter Hurley port = uart_port_ref(state); 2445ef510beaSAndy Shevchenko if (port) { 24469ed19428SPeter Hurley ret = port->ops->poll_get_char(port); 24479ed19428SPeter Hurley uart_port_deref(port); 24489ed19428SPeter Hurley } 244922077b09SJiri Slaby 24509ed19428SPeter Hurley return ret; 2451ab4382d2SGreg Kroah-Hartman } 2452ab4382d2SGreg Kroah-Hartman 2453ab4382d2SGreg Kroah-Hartman static void uart_poll_put_char(struct tty_driver *driver, int line, char ch) 2454ab4382d2SGreg Kroah-Hartman { 2455ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2456ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2457ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2458ab4382d2SGreg Kroah-Hartman 24599ed19428SPeter Hurley port = uart_port_ref(state); 24609ed19428SPeter Hurley if (!port) 24619ed19428SPeter Hurley return; 2462c7d44a02SDoug Anderson 2463c7d44a02SDoug Anderson if (ch == '\n') 2464c7d44a02SDoug Anderson port->ops->poll_put_char(port, '\r'); 2465ab4382d2SGreg Kroah-Hartman port->ops->poll_put_char(port, ch); 24669ed19428SPeter Hurley uart_port_deref(port); 2467ab4382d2SGreg Kroah-Hartman } 2468ab4382d2SGreg Kroah-Hartman #endif 2469ab4382d2SGreg Kroah-Hartman 2470ab4382d2SGreg Kroah-Hartman static const struct tty_operations uart_ops = { 24714cdd17baSJiri Slaby .install = uart_install, 2472ab4382d2SGreg Kroah-Hartman .open = uart_open, 2473ab4382d2SGreg Kroah-Hartman .close = uart_close, 2474ab4382d2SGreg Kroah-Hartman .write = uart_write, 2475ab4382d2SGreg Kroah-Hartman .put_char = uart_put_char, 2476ab4382d2SGreg Kroah-Hartman .flush_chars = uart_flush_chars, 2477ab4382d2SGreg Kroah-Hartman .write_room = uart_write_room, 2478ab4382d2SGreg Kroah-Hartman .chars_in_buffer= uart_chars_in_buffer, 2479ab4382d2SGreg Kroah-Hartman .flush_buffer = uart_flush_buffer, 2480ab4382d2SGreg Kroah-Hartman .ioctl = uart_ioctl, 2481ab4382d2SGreg Kroah-Hartman .throttle = uart_throttle, 2482ab4382d2SGreg Kroah-Hartman .unthrottle = uart_unthrottle, 2483ab4382d2SGreg Kroah-Hartman .send_xchar = uart_send_xchar, 2484ab4382d2SGreg Kroah-Hartman .set_termios = uart_set_termios, 2485ab4382d2SGreg Kroah-Hartman .set_ldisc = uart_set_ldisc, 2486ab4382d2SGreg Kroah-Hartman .stop = uart_stop, 2487ab4382d2SGreg Kroah-Hartman .start = uart_start, 2488ab4382d2SGreg Kroah-Hartman .hangup = uart_hangup, 2489ab4382d2SGreg Kroah-Hartman .break_ctl = uart_break_ctl, 2490ab4382d2SGreg Kroah-Hartman .wait_until_sent= uart_wait_until_sent, 2491ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_PROC_FS 24928a8dcabfSChristoph Hellwig .proc_show = uart_proc_show, 2493ab4382d2SGreg Kroah-Hartman #endif 2494ab4382d2SGreg Kroah-Hartman .tiocmget = uart_tiocmget, 2495ab4382d2SGreg Kroah-Hartman .tiocmset = uart_tiocmset, 24965099d234SAl Viro .set_serial = uart_set_info_user, 24975099d234SAl Viro .get_serial = uart_get_info_user, 2498ab4382d2SGreg Kroah-Hartman .get_icount = uart_get_icount, 2499ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 2500ab4382d2SGreg Kroah-Hartman .poll_init = uart_poll_init, 2501ab4382d2SGreg Kroah-Hartman .poll_get_char = uart_poll_get_char, 2502ab4382d2SGreg Kroah-Hartman .poll_put_char = uart_poll_put_char, 2503ab4382d2SGreg Kroah-Hartman #endif 2504ab4382d2SGreg Kroah-Hartman }; 2505ab4382d2SGreg Kroah-Hartman 2506ab4382d2SGreg Kroah-Hartman static const struct tty_port_operations uart_port_ops = { 2507ab4382d2SGreg Kroah-Hartman .carrier_raised = uart_carrier_raised, 2508ab4382d2SGreg Kroah-Hartman .dtr_rts = uart_dtr_rts, 2509b3b57646SRob Herring .activate = uart_port_activate, 2510761ed4a9SRob Herring .shutdown = uart_tty_port_shutdown, 2511ab4382d2SGreg Kroah-Hartman }; 2512ab4382d2SGreg Kroah-Hartman 2513ab4382d2SGreg Kroah-Hartman /** 2514ab4382d2SGreg Kroah-Hartman * uart_register_driver - register a driver with the uart core layer 2515ab4382d2SGreg Kroah-Hartman * @drv: low level driver structure 2516ab4382d2SGreg Kroah-Hartman * 2517ab4382d2SGreg Kroah-Hartman * Register a uart driver with the core driver. We in turn register 2518ab4382d2SGreg Kroah-Hartman * with the tty layer, and initialise the core driver per-port state. 2519ab4382d2SGreg Kroah-Hartman * 2520ab4382d2SGreg Kroah-Hartman * We have a proc file in /proc/tty/driver which is named after the 2521ab4382d2SGreg Kroah-Hartman * normal driver. 2522ab4382d2SGreg Kroah-Hartman * 2523ab4382d2SGreg Kroah-Hartman * drv->port should be NULL, and the per-port structures should be 2524ab4382d2SGreg Kroah-Hartman * registered using uart_add_one_port after this call has succeeded. 2525ab4382d2SGreg Kroah-Hartman */ 2526ab4382d2SGreg Kroah-Hartman int uart_register_driver(struct uart_driver *drv) 2527ab4382d2SGreg Kroah-Hartman { 2528ab4382d2SGreg Kroah-Hartman struct tty_driver *normal; 2529050dfc09SSergey Organov int i, retval = -ENOMEM; 2530ab4382d2SGreg Kroah-Hartman 2531ab4382d2SGreg Kroah-Hartman BUG_ON(drv->state); 2532ab4382d2SGreg Kroah-Hartman 2533ab4382d2SGreg Kroah-Hartman /* 2534ab4382d2SGreg Kroah-Hartman * Maybe we should be using a slab cache for this, especially if 2535ab4382d2SGreg Kroah-Hartman * we have a large number of ports to handle. 2536ab4382d2SGreg Kroah-Hartman */ 25376396bb22SKees Cook drv->state = kcalloc(drv->nr, sizeof(struct uart_state), GFP_KERNEL); 2538ab4382d2SGreg Kroah-Hartman if (!drv->state) 2539ab4382d2SGreg Kroah-Hartman goto out; 2540ab4382d2SGreg Kroah-Hartman 254139b7b42bSJiri Slaby normal = tty_alloc_driver(drv->nr, TTY_DRIVER_REAL_RAW | 254239b7b42bSJiri Slaby TTY_DRIVER_DYNAMIC_DEV); 254339b7b42bSJiri Slaby if (IS_ERR(normal)) { 254439b7b42bSJiri Slaby retval = PTR_ERR(normal); 2545ab4382d2SGreg Kroah-Hartman goto out_kfree; 254639b7b42bSJiri Slaby } 2547ab4382d2SGreg Kroah-Hartman 2548ab4382d2SGreg Kroah-Hartman drv->tty_driver = normal; 2549ab4382d2SGreg Kroah-Hartman 2550ab4382d2SGreg Kroah-Hartman normal->driver_name = drv->driver_name; 2551ab4382d2SGreg Kroah-Hartman normal->name = drv->dev_name; 2552ab4382d2SGreg Kroah-Hartman normal->major = drv->major; 2553ab4382d2SGreg Kroah-Hartman normal->minor_start = drv->minor; 2554ab4382d2SGreg Kroah-Hartman normal->type = TTY_DRIVER_TYPE_SERIAL; 2555ab4382d2SGreg Kroah-Hartman normal->subtype = SERIAL_TYPE_NORMAL; 2556ab4382d2SGreg Kroah-Hartman normal->init_termios = tty_std_termios; 2557ab4382d2SGreg Kroah-Hartman normal->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; 2558ab4382d2SGreg Kroah-Hartman normal->init_termios.c_ispeed = normal->init_termios.c_ospeed = 9600; 2559ab4382d2SGreg Kroah-Hartman normal->driver_state = drv; 2560ab4382d2SGreg Kroah-Hartman tty_set_operations(normal, &uart_ops); 2561ab4382d2SGreg Kroah-Hartman 2562ab4382d2SGreg Kroah-Hartman /* 2563ab4382d2SGreg Kroah-Hartman * Initialise the UART state(s). 2564ab4382d2SGreg Kroah-Hartman */ 2565ab4382d2SGreg Kroah-Hartman for (i = 0; i < drv->nr; i++) { 2566ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + i; 2567ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2568ab4382d2SGreg Kroah-Hartman 2569ab4382d2SGreg Kroah-Hartman tty_port_init(port); 2570ab4382d2SGreg Kroah-Hartman port->ops = &uart_port_ops; 2571ab4382d2SGreg Kroah-Hartman } 2572ab4382d2SGreg Kroah-Hartman 2573ab4382d2SGreg Kroah-Hartman retval = tty_register_driver(normal); 2574ab4382d2SGreg Kroah-Hartman if (retval >= 0) 2575ab4382d2SGreg Kroah-Hartman return retval; 2576ab4382d2SGreg Kroah-Hartman 2577191c5f10SJiri Slaby for (i = 0; i < drv->nr; i++) 2578191c5f10SJiri Slaby tty_port_destroy(&drv->state[i].port); 25799f90a4ddSJiri Slaby tty_driver_kref_put(normal); 2580ab4382d2SGreg Kroah-Hartman out_kfree: 2581ab4382d2SGreg Kroah-Hartman kfree(drv->state); 2582ab4382d2SGreg Kroah-Hartman out: 2583050dfc09SSergey Organov return retval; 2584ab4382d2SGreg Kroah-Hartman } 2585ab4382d2SGreg Kroah-Hartman 2586ab4382d2SGreg Kroah-Hartman /** 2587ab4382d2SGreg Kroah-Hartman * uart_unregister_driver - remove a driver from the uart core layer 2588ab4382d2SGreg Kroah-Hartman * @drv: low level driver structure 2589ab4382d2SGreg Kroah-Hartman * 2590ab4382d2SGreg Kroah-Hartman * Remove all references to a driver from the core driver. The low 2591ab4382d2SGreg Kroah-Hartman * level driver must have removed all its ports via the 2592ab4382d2SGreg Kroah-Hartman * uart_remove_one_port() if it registered them with uart_add_one_port(). 2593ab4382d2SGreg Kroah-Hartman * (ie, drv->port == NULL) 2594ab4382d2SGreg Kroah-Hartman */ 2595ab4382d2SGreg Kroah-Hartman void uart_unregister_driver(struct uart_driver *drv) 2596ab4382d2SGreg Kroah-Hartman { 2597ab4382d2SGreg Kroah-Hartman struct tty_driver *p = drv->tty_driver; 2598191c5f10SJiri Slaby unsigned int i; 2599191c5f10SJiri Slaby 2600ab4382d2SGreg Kroah-Hartman tty_unregister_driver(p); 26019f90a4ddSJiri Slaby tty_driver_kref_put(p); 2602191c5f10SJiri Slaby for (i = 0; i < drv->nr; i++) 2603191c5f10SJiri Slaby tty_port_destroy(&drv->state[i].port); 2604ab4382d2SGreg Kroah-Hartman kfree(drv->state); 26051e66cdedSAlan Cox drv->state = NULL; 2606ab4382d2SGreg Kroah-Hartman drv->tty_driver = NULL; 2607ab4382d2SGreg Kroah-Hartman } 2608ab4382d2SGreg Kroah-Hartman 2609ab4382d2SGreg Kroah-Hartman struct tty_driver *uart_console_device(struct console *co, int *index) 2610ab4382d2SGreg Kroah-Hartman { 2611ab4382d2SGreg Kroah-Hartman struct uart_driver *p = co->data; 2612ab4382d2SGreg Kroah-Hartman *index = co->index; 2613ab4382d2SGreg Kroah-Hartman return p->tty_driver; 2614ab4382d2SGreg Kroah-Hartman } 2615488f49acSJohn Stultz EXPORT_SYMBOL_GPL(uart_console_device); 2616ab4382d2SGreg Kroah-Hartman 2617143c02c8SAndy Shevchenko static ssize_t uartclk_show(struct device *dev, 26186915c0e4STomas Hlavacek struct device_attribute *attr, char *buf) 26196915c0e4STomas Hlavacek { 2620bebe73e3SAlan Cox struct serial_struct tmp; 26216915c0e4STomas Hlavacek struct tty_port *port = dev_get_drvdata(dev); 2622b1b79916STomas Hlavacek 26239f109694SAlan Cox uart_get_info(port, &tmp); 26249cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.baud_base * 16); 26256915c0e4STomas Hlavacek } 26266915c0e4STomas Hlavacek 2627143c02c8SAndy Shevchenko static ssize_t type_show(struct device *dev, 2628373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2629373bac4cSAlan Cox { 2630373bac4cSAlan Cox struct serial_struct tmp; 2631373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2632373bac4cSAlan Cox 2633373bac4cSAlan Cox uart_get_info(port, &tmp); 26349cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.type); 2635373bac4cSAlan Cox } 2636143c02c8SAndy Shevchenko 2637143c02c8SAndy Shevchenko static ssize_t line_show(struct device *dev, 2638373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2639373bac4cSAlan Cox { 2640373bac4cSAlan Cox struct serial_struct tmp; 2641373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2642373bac4cSAlan Cox 2643373bac4cSAlan Cox uart_get_info(port, &tmp); 26449cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.line); 2645373bac4cSAlan Cox } 2646373bac4cSAlan Cox 2647143c02c8SAndy Shevchenko static ssize_t port_show(struct device *dev, 2648373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2649373bac4cSAlan Cox { 2650373bac4cSAlan Cox struct serial_struct tmp; 2651373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2652fd985e1dSAndrew Morton unsigned long ioaddr; 2653373bac4cSAlan Cox 2654373bac4cSAlan Cox uart_get_info(port, &tmp); 2655fd985e1dSAndrew Morton ioaddr = tmp.port; 2656fd985e1dSAndrew Morton if (HIGH_BITS_OFFSET) 2657fd985e1dSAndrew Morton ioaddr |= (unsigned long)tmp.port_high << HIGH_BITS_OFFSET; 26589cfbf7a6SAlex Dewar return sprintf(buf, "0x%lX\n", ioaddr); 2659373bac4cSAlan Cox } 2660373bac4cSAlan Cox 2661143c02c8SAndy Shevchenko static ssize_t irq_show(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); 26689cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.irq); 2669373bac4cSAlan Cox } 2670373bac4cSAlan Cox 2671143c02c8SAndy Shevchenko static ssize_t flags_show(struct device *dev, 2672373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2673373bac4cSAlan Cox { 2674373bac4cSAlan Cox struct serial_struct tmp; 2675373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2676373bac4cSAlan Cox 2677373bac4cSAlan Cox uart_get_info(port, &tmp); 26789cfbf7a6SAlex Dewar return sprintf(buf, "0x%X\n", tmp.flags); 2679373bac4cSAlan Cox } 2680373bac4cSAlan Cox 2681143c02c8SAndy Shevchenko static ssize_t xmit_fifo_size_show(struct device *dev, 2682373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2683373bac4cSAlan Cox { 2684373bac4cSAlan Cox struct serial_struct tmp; 2685373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2686373bac4cSAlan Cox 2687373bac4cSAlan Cox uart_get_info(port, &tmp); 26889cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.xmit_fifo_size); 2689373bac4cSAlan Cox } 2690373bac4cSAlan Cox 2691143c02c8SAndy Shevchenko static ssize_t close_delay_show(struct device *dev, 2692373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2693373bac4cSAlan Cox { 2694373bac4cSAlan Cox struct serial_struct tmp; 2695373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2696373bac4cSAlan Cox 2697373bac4cSAlan Cox uart_get_info(port, &tmp); 26989cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.close_delay); 2699373bac4cSAlan Cox } 2700373bac4cSAlan Cox 2701143c02c8SAndy Shevchenko static ssize_t closing_wait_show(struct device *dev, 2702373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2703373bac4cSAlan Cox { 2704373bac4cSAlan Cox struct serial_struct tmp; 2705373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2706373bac4cSAlan Cox 2707373bac4cSAlan Cox uart_get_info(port, &tmp); 27089cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.closing_wait); 2709373bac4cSAlan Cox } 2710373bac4cSAlan Cox 2711143c02c8SAndy Shevchenko static ssize_t custom_divisor_show(struct device *dev, 2712373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2713373bac4cSAlan Cox { 2714373bac4cSAlan Cox struct serial_struct tmp; 2715373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2716373bac4cSAlan Cox 2717373bac4cSAlan Cox uart_get_info(port, &tmp); 27189cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.custom_divisor); 2719373bac4cSAlan Cox } 2720373bac4cSAlan Cox 2721143c02c8SAndy Shevchenko static ssize_t io_type_show(struct device *dev, 2722373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2723373bac4cSAlan Cox { 2724373bac4cSAlan Cox struct serial_struct tmp; 2725373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2726373bac4cSAlan Cox 2727373bac4cSAlan Cox uart_get_info(port, &tmp); 27289cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.io_type); 2729373bac4cSAlan Cox } 2730373bac4cSAlan Cox 2731143c02c8SAndy Shevchenko static ssize_t iomem_base_show(struct device *dev, 2732373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2733373bac4cSAlan Cox { 2734373bac4cSAlan Cox struct serial_struct tmp; 2735373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2736373bac4cSAlan Cox 2737373bac4cSAlan Cox uart_get_info(port, &tmp); 27389cfbf7a6SAlex Dewar return sprintf(buf, "0x%lX\n", (unsigned long)tmp.iomem_base); 2739373bac4cSAlan Cox } 2740373bac4cSAlan Cox 2741143c02c8SAndy Shevchenko static ssize_t iomem_reg_shift_show(struct device *dev, 2742373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2743373bac4cSAlan Cox { 2744373bac4cSAlan Cox struct serial_struct tmp; 2745373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2746373bac4cSAlan Cox 2747373bac4cSAlan Cox uart_get_info(port, &tmp); 27489cfbf7a6SAlex Dewar return sprintf(buf, "%d\n", tmp.iomem_reg_shift); 2749373bac4cSAlan Cox } 2750373bac4cSAlan Cox 2751a3cb39d2SAndy Shevchenko static ssize_t console_show(struct device *dev, 2752a3cb39d2SAndy Shevchenko struct device_attribute *attr, char *buf) 2753a3cb39d2SAndy Shevchenko { 2754a3cb39d2SAndy Shevchenko struct tty_port *port = dev_get_drvdata(dev); 2755a3cb39d2SAndy Shevchenko struct uart_state *state = container_of(port, struct uart_state, port); 2756a3cb39d2SAndy Shevchenko struct uart_port *uport; 2757a3cb39d2SAndy Shevchenko bool console = false; 2758a3cb39d2SAndy Shevchenko 2759a3cb39d2SAndy Shevchenko mutex_lock(&port->mutex); 2760a3cb39d2SAndy Shevchenko uport = uart_port_check(state); 2761a3cb39d2SAndy Shevchenko if (uport) 2762a3cb39d2SAndy Shevchenko console = uart_console_enabled(uport); 2763a3cb39d2SAndy Shevchenko mutex_unlock(&port->mutex); 2764a3cb39d2SAndy Shevchenko 2765a3cb39d2SAndy Shevchenko return sprintf(buf, "%c\n", console ? 'Y' : 'N'); 2766a3cb39d2SAndy Shevchenko } 2767a3cb39d2SAndy Shevchenko 2768a3cb39d2SAndy Shevchenko static ssize_t console_store(struct device *dev, 2769a3cb39d2SAndy Shevchenko struct device_attribute *attr, const char *buf, size_t count) 2770a3cb39d2SAndy Shevchenko { 2771a3cb39d2SAndy Shevchenko struct tty_port *port = dev_get_drvdata(dev); 2772a3cb39d2SAndy Shevchenko struct uart_state *state = container_of(port, struct uart_state, port); 2773a3cb39d2SAndy Shevchenko struct uart_port *uport; 2774a3cb39d2SAndy Shevchenko bool oldconsole, newconsole; 2775a3cb39d2SAndy Shevchenko int ret; 2776a3cb39d2SAndy Shevchenko 2777a3cb39d2SAndy Shevchenko ret = kstrtobool(buf, &newconsole); 2778a3cb39d2SAndy Shevchenko if (ret) 2779a3cb39d2SAndy Shevchenko return ret; 2780a3cb39d2SAndy Shevchenko 2781a3cb39d2SAndy Shevchenko mutex_lock(&port->mutex); 2782a3cb39d2SAndy Shevchenko uport = uart_port_check(state); 2783a3cb39d2SAndy Shevchenko if (uport) { 2784a3cb39d2SAndy Shevchenko oldconsole = uart_console_enabled(uport); 2785a3cb39d2SAndy Shevchenko if (oldconsole && !newconsole) { 2786a3cb39d2SAndy Shevchenko ret = unregister_console(uport->cons); 2787a3cb39d2SAndy Shevchenko } else if (!oldconsole && newconsole) { 2788e0830dbfSJohan Hovold if (uart_console(uport)) { 2789e0830dbfSJohan Hovold uport->console_reinit = 1; 2790a3cb39d2SAndy Shevchenko register_console(uport->cons); 2791e0830dbfSJohan Hovold } else { 2792a3cb39d2SAndy Shevchenko ret = -ENOENT; 2793a3cb39d2SAndy Shevchenko } 2794e0830dbfSJohan Hovold } 2795a3cb39d2SAndy Shevchenko } else { 2796a3cb39d2SAndy Shevchenko ret = -ENXIO; 2797a3cb39d2SAndy Shevchenko } 2798a3cb39d2SAndy Shevchenko mutex_unlock(&port->mutex); 2799a3cb39d2SAndy Shevchenko 2800a3cb39d2SAndy Shevchenko return ret < 0 ? ret : count; 2801a3cb39d2SAndy Shevchenko } 2802a3cb39d2SAndy Shevchenko 2803143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(uartclk); 2804143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(type); 2805143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(line); 2806143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(port); 2807143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(irq); 2808143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(flags); 2809143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(xmit_fifo_size); 2810143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(close_delay); 2811143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(closing_wait); 2812143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(custom_divisor); 2813143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(io_type); 2814143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(iomem_base); 2815143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(iomem_reg_shift); 2816a3cb39d2SAndy Shevchenko static DEVICE_ATTR_RW(console); 28176915c0e4STomas Hlavacek 28186915c0e4STomas Hlavacek static struct attribute *tty_dev_attrs[] = { 2819143c02c8SAndy Shevchenko &dev_attr_uartclk.attr, 2820373bac4cSAlan Cox &dev_attr_type.attr, 2821373bac4cSAlan Cox &dev_attr_line.attr, 2822373bac4cSAlan Cox &dev_attr_port.attr, 2823373bac4cSAlan Cox &dev_attr_irq.attr, 2824373bac4cSAlan Cox &dev_attr_flags.attr, 2825373bac4cSAlan Cox &dev_attr_xmit_fifo_size.attr, 2826373bac4cSAlan Cox &dev_attr_close_delay.attr, 2827373bac4cSAlan Cox &dev_attr_closing_wait.attr, 2828373bac4cSAlan Cox &dev_attr_custom_divisor.attr, 2829373bac4cSAlan Cox &dev_attr_io_type.attr, 2830373bac4cSAlan Cox &dev_attr_iomem_base.attr, 2831373bac4cSAlan Cox &dev_attr_iomem_reg_shift.attr, 2832a3cb39d2SAndy Shevchenko &dev_attr_console.attr, 2833a3cb39d2SAndy Shevchenko NULL 28346915c0e4STomas Hlavacek }; 28356915c0e4STomas Hlavacek 2836b1b79916STomas Hlavacek static const struct attribute_group tty_dev_attr_group = { 28376915c0e4STomas Hlavacek .attrs = tty_dev_attrs, 28386915c0e4STomas Hlavacek }; 28396915c0e4STomas Hlavacek 2840ab4382d2SGreg Kroah-Hartman /** 2841ab4382d2SGreg Kroah-Hartman * uart_add_one_port - attach a driver-defined port structure 2842ab4382d2SGreg Kroah-Hartman * @drv: pointer to the uart low level driver structure for this port 2843ab4382d2SGreg Kroah-Hartman * @uport: uart port structure to use for this port. 2844ab4382d2SGreg Kroah-Hartman * 2845a157270fSAhmed S. Darwish * Context: task context, might sleep 2846a157270fSAhmed S. Darwish * 2847ab4382d2SGreg Kroah-Hartman * This allows the driver to register its own uart_port structure 2848ab4382d2SGreg Kroah-Hartman * with the core driver. The main purpose is to allow the low 2849ab4382d2SGreg Kroah-Hartman * level uart drivers to expand uart_port, rather than having yet 2850ab4382d2SGreg Kroah-Hartman * more levels of structures. 2851ab4382d2SGreg Kroah-Hartman */ 2852ab4382d2SGreg Kroah-Hartman int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport) 2853ab4382d2SGreg Kroah-Hartman { 2854ab4382d2SGreg Kroah-Hartman struct uart_state *state; 2855ab4382d2SGreg Kroah-Hartman struct tty_port *port; 2856ab4382d2SGreg Kroah-Hartman int ret = 0; 2857ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 2858266dcff0SGreg Kroah-Hartman int num_groups; 2859ab4382d2SGreg Kroah-Hartman 2860ab4382d2SGreg Kroah-Hartman if (uport->line >= drv->nr) 2861ab4382d2SGreg Kroah-Hartman return -EINVAL; 2862ab4382d2SGreg Kroah-Hartman 2863ab4382d2SGreg Kroah-Hartman state = drv->state + uport->line; 2864ab4382d2SGreg Kroah-Hartman port = &state->port; 2865ab4382d2SGreg Kroah-Hartman 2866ab4382d2SGreg Kroah-Hartman mutex_lock(&port_mutex); 2867ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2868ab4382d2SGreg Kroah-Hartman if (state->uart_port) { 2869ab4382d2SGreg Kroah-Hartman ret = -EINVAL; 2870ab4382d2SGreg Kroah-Hartman goto out; 2871ab4382d2SGreg Kroah-Hartman } 2872ab4382d2SGreg Kroah-Hartman 28732b702b9bSPeter Hurley /* Link the port to the driver state table and vice versa */ 28749ed19428SPeter Hurley atomic_set(&state->refcount, 1); 28759ed19428SPeter Hurley init_waitqueue_head(&state->remove_wait); 2876ab4382d2SGreg Kroah-Hartman state->uart_port = uport; 2877ab4382d2SGreg Kroah-Hartman uport->state = state; 2878ab4382d2SGreg Kroah-Hartman 28792b702b9bSPeter Hurley state->pm_state = UART_PM_STATE_UNDEFINED; 28802b702b9bSPeter Hurley uport->cons = drv->cons; 2881959801feSPeter Hurley uport->minor = drv->tty_driver->minor_start + uport->line; 2882f7048b15SVignesh R uport->name = kasprintf(GFP_KERNEL, "%s%d", drv->dev_name, 2883f7048b15SVignesh R drv->tty_driver->name_base + uport->line); 2884f7048b15SVignesh R if (!uport->name) { 2885f7048b15SVignesh R ret = -ENOMEM; 2886f7048b15SVignesh R goto out; 2887f7048b15SVignesh R } 28882b702b9bSPeter Hurley 2889fe88c648SJohan Hovold /* 2890fe88c648SJohan Hovold * If this port is in use as a console then the spinlock is already 2891fe88c648SJohan Hovold * initialised. 2892fe88c648SJohan Hovold */ 2893fe88c648SJohan Hovold if (!uart_console_enabled(uport)) 2894d2403cadSAndy Shevchenko uart_port_spin_lock_init(uport); 2895d2403cadSAndy Shevchenko 2896a208ffd2SGrant Likely if (uport->cons && uport->dev) 2897dd8b7a1dSMichal Simek of_console_check(uport->dev->of_node, uport->cons->name, uport->line); 2898ab4382d2SGreg Kroah-Hartman 2899fb2b9001SSudip Mukherjee tty_port_link_device(port, drv->tty_driver, uport->line); 2900ab4382d2SGreg Kroah-Hartman uart_configure_port(drv, state, uport); 2901ab4382d2SGreg Kroah-Hartman 29024dda864dSGeert Uytterhoeven port->console = uart_console(uport); 29034dda864dSGeert Uytterhoeven 2904266dcff0SGreg Kroah-Hartman num_groups = 2; 2905266dcff0SGreg Kroah-Hartman if (uport->attr_group) 2906266dcff0SGreg Kroah-Hartman num_groups++; 2907266dcff0SGreg Kroah-Hartman 2908c2b703b8SYoshihiro YUNOMAE uport->tty_groups = kcalloc(num_groups, sizeof(*uport->tty_groups), 2909266dcff0SGreg Kroah-Hartman GFP_KERNEL); 2910266dcff0SGreg Kroah-Hartman if (!uport->tty_groups) { 2911266dcff0SGreg Kroah-Hartman ret = -ENOMEM; 2912266dcff0SGreg Kroah-Hartman goto out; 2913266dcff0SGreg Kroah-Hartman } 2914266dcff0SGreg Kroah-Hartman uport->tty_groups[0] = &tty_dev_attr_group; 2915266dcff0SGreg Kroah-Hartman if (uport->attr_group) 2916266dcff0SGreg Kroah-Hartman uport->tty_groups[1] = uport->attr_group; 2917266dcff0SGreg Kroah-Hartman 2918ab4382d2SGreg Kroah-Hartman /* 2919ab4382d2SGreg Kroah-Hartman * Register the port whether it's detected or not. This allows 2920015355b7SGeert Uytterhoeven * setserial to be used to alter this port's parameters. 2921ab4382d2SGreg Kroah-Hartman */ 2922da4c2799SJohan Hovold tty_dev = tty_port_register_device_attr_serdev(port, drv->tty_driver, 2923266dcff0SGreg Kroah-Hartman uport->line, uport->dev, port, uport->tty_groups); 2924b289c496SChengguang Xu if (!IS_ERR(tty_dev)) { 292577359835SSimon Glass device_set_wakeup_capable(tty_dev, 1); 292677359835SSimon Glass } else { 29272f2dafe7SSudip Mukherjee dev_err(uport->dev, "Cannot register tty device on line %d\n", 2928ab4382d2SGreg Kroah-Hartman uport->line); 292977359835SSimon Glass } 2930ab4382d2SGreg Kroah-Hartman 2931ab4382d2SGreg Kroah-Hartman /* 2932ab4382d2SGreg Kroah-Hartman * Ensure UPF_DEAD is not set. 2933ab4382d2SGreg Kroah-Hartman */ 2934ab4382d2SGreg Kroah-Hartman uport->flags &= ~UPF_DEAD; 2935ab4382d2SGreg Kroah-Hartman 2936ab4382d2SGreg Kroah-Hartman out: 2937ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2938ab4382d2SGreg Kroah-Hartman mutex_unlock(&port_mutex); 2939ab4382d2SGreg Kroah-Hartman 2940ab4382d2SGreg Kroah-Hartman return ret; 2941ab4382d2SGreg Kroah-Hartman } 2942ab4382d2SGreg Kroah-Hartman 2943ab4382d2SGreg Kroah-Hartman /** 2944ab4382d2SGreg Kroah-Hartman * uart_remove_one_port - detach a driver defined port structure 2945ab4382d2SGreg Kroah-Hartman * @drv: pointer to the uart low level driver structure for this port 2946ab4382d2SGreg Kroah-Hartman * @uport: uart port structure for this port 2947ab4382d2SGreg Kroah-Hartman * 2948a157270fSAhmed S. Darwish * Context: task context, might sleep 2949a157270fSAhmed S. Darwish * 2950ab4382d2SGreg Kroah-Hartman * This unhooks (and hangs up) the specified port structure from the 2951ab4382d2SGreg Kroah-Hartman * core driver. No further calls will be made to the low-level code 2952ab4382d2SGreg Kroah-Hartman * for this port. 2953ab4382d2SGreg Kroah-Hartman */ 2954ab4382d2SGreg Kroah-Hartman int uart_remove_one_port(struct uart_driver *drv, struct uart_port *uport) 2955ab4382d2SGreg Kroah-Hartman { 2956ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 2957ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 29584047b371SPeter Hurley struct uart_port *uart_port; 29594c6d5b4dSGeert Uytterhoeven struct tty_struct *tty; 2960b342dd51SChen Gang int ret = 0; 2961ab4382d2SGreg Kroah-Hartman 2962ab4382d2SGreg Kroah-Hartman mutex_lock(&port_mutex); 2963ab4382d2SGreg Kroah-Hartman 2964ab4382d2SGreg Kroah-Hartman /* 2965ab4382d2SGreg Kroah-Hartman * Mark the port "dead" - this prevents any opens from 2966ab4382d2SGreg Kroah-Hartman * succeeding while we shut down the port. 2967ab4382d2SGreg Kroah-Hartman */ 2968ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 29694047b371SPeter Hurley uart_port = uart_port_check(state); 29704047b371SPeter Hurley if (uart_port != uport) 29714047b371SPeter Hurley dev_alert(uport->dev, "Removing wrong port: %p != %p\n", 29724047b371SPeter Hurley uart_port, uport); 29734047b371SPeter Hurley 29744047b371SPeter Hurley if (!uart_port) { 2975b342dd51SChen Gang mutex_unlock(&port->mutex); 2976b342dd51SChen Gang ret = -EINVAL; 2977b342dd51SChen Gang goto out; 2978b342dd51SChen Gang } 2979ab4382d2SGreg Kroah-Hartman uport->flags |= UPF_DEAD; 2980ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2981ab4382d2SGreg Kroah-Hartman 2982ab4382d2SGreg Kroah-Hartman /* 2983ab4382d2SGreg Kroah-Hartman * Remove the devices from the tty layer 2984ab4382d2SGreg Kroah-Hartman */ 2985da4c2799SJohan Hovold tty_port_unregister_device(port, drv->tty_driver, uport->line); 2986ab4382d2SGreg Kroah-Hartman 29874c6d5b4dSGeert Uytterhoeven tty = tty_port_tty_get(port); 29884c6d5b4dSGeert Uytterhoeven if (tty) { 2989ab4382d2SGreg Kroah-Hartman tty_vhangup(port->tty); 29904c6d5b4dSGeert Uytterhoeven tty_kref_put(tty); 29914c6d5b4dSGeert Uytterhoeven } 2992ab4382d2SGreg Kroah-Hartman 2993ab4382d2SGreg Kroah-Hartman /* 29945f5c9ae5SGeert Uytterhoeven * If the port is used as a console, unregister it 29955f5c9ae5SGeert Uytterhoeven */ 29965f5c9ae5SGeert Uytterhoeven if (uart_console(uport)) 29975f5c9ae5SGeert Uytterhoeven unregister_console(uport->cons); 29985f5c9ae5SGeert Uytterhoeven 29995f5c9ae5SGeert Uytterhoeven /* 3000ab4382d2SGreg Kroah-Hartman * Free the port IO and memory resources, if any. 3001ab4382d2SGreg Kroah-Hartman */ 3002a7cfaf16SFabio Estevam if (uport->type != PORT_UNKNOWN && uport->ops->release_port) 3003ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 3004266dcff0SGreg Kroah-Hartman kfree(uport->tty_groups); 3005f7048b15SVignesh R kfree(uport->name); 3006ab4382d2SGreg Kroah-Hartman 3007ab4382d2SGreg Kroah-Hartman /* 3008ab4382d2SGreg Kroah-Hartman * Indicate that there isn't a port here anymore. 3009ab4382d2SGreg Kroah-Hartman */ 3010ab4382d2SGreg Kroah-Hartman uport->type = PORT_UNKNOWN; 3011ab4382d2SGreg Kroah-Hartman 30124047b371SPeter Hurley mutex_lock(&port->mutex); 30139ed19428SPeter Hurley WARN_ON(atomic_dec_return(&state->refcount) < 0); 30149ed19428SPeter Hurley wait_event(state->remove_wait, !atomic_read(&state->refcount)); 3015ab4382d2SGreg Kroah-Hartman state->uart_port = NULL; 30164047b371SPeter Hurley mutex_unlock(&port->mutex); 3017b342dd51SChen Gang out: 3018ab4382d2SGreg Kroah-Hartman mutex_unlock(&port_mutex); 3019ab4382d2SGreg Kroah-Hartman 3020b342dd51SChen Gang return ret; 3021ab4382d2SGreg Kroah-Hartman } 3022ab4382d2SGreg Kroah-Hartman 3023ab4382d2SGreg Kroah-Hartman /* 3024ab4382d2SGreg Kroah-Hartman * Are the two ports equivalent? 3025ab4382d2SGreg Kroah-Hartman */ 3026b8be5db5SJiri Slaby bool uart_match_port(const struct uart_port *port1, 3027b8be5db5SJiri Slaby const struct uart_port *port2) 3028ab4382d2SGreg Kroah-Hartman { 3029ab4382d2SGreg Kroah-Hartman if (port1->iotype != port2->iotype) 3030b8be5db5SJiri Slaby return false; 3031ab4382d2SGreg Kroah-Hartman 3032ab4382d2SGreg Kroah-Hartman switch (port1->iotype) { 3033ab4382d2SGreg Kroah-Hartman case UPIO_PORT: 3034b8be5db5SJiri Slaby return port1->iobase == port2->iobase; 3035ab4382d2SGreg Kroah-Hartman case UPIO_HUB6: 3036b8be5db5SJiri Slaby return port1->iobase == port2->iobase && 3037b8be5db5SJiri Slaby port1->hub6 == port2->hub6; 3038ab4382d2SGreg Kroah-Hartman case UPIO_MEM: 3039bd94c407SMasahiro Yamada case UPIO_MEM16: 3040ab4382d2SGreg Kroah-Hartman case UPIO_MEM32: 30413ffb1a81SKevin Cernekee case UPIO_MEM32BE: 3042ab4382d2SGreg Kroah-Hartman case UPIO_AU: 3043ab4382d2SGreg Kroah-Hartman case UPIO_TSI: 3044b8be5db5SJiri Slaby return port1->mapbase == port2->mapbase; 3045ab4382d2SGreg Kroah-Hartman } 3046b8be5db5SJiri Slaby 3047b8be5db5SJiri Slaby return false; 3048ab4382d2SGreg Kroah-Hartman } 3049ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_match_port); 3050ab4382d2SGreg Kroah-Hartman 3051027d7dacSJiri Slaby /** 3052027d7dacSJiri Slaby * uart_handle_dcd_change - handle a change of carrier detect state 3053027d7dacSJiri Slaby * @uport: uart_port structure for the open port 3054027d7dacSJiri Slaby * @status: new carrier detect status, nonzero if active 30554d90bb14SPeter Hurley * 30564d90bb14SPeter Hurley * Caller must hold uport->lock 3057027d7dacSJiri Slaby */ 3058027d7dacSJiri Slaby void uart_handle_dcd_change(struct uart_port *uport, unsigned int status) 3059027d7dacSJiri Slaby { 306042381572SGeorge Spelvin struct tty_port *port = &uport->state->port; 306143eca0aeSAlan Cox struct tty_struct *tty = port->tty; 3062c993257bSPeter Hurley struct tty_ldisc *ld; 3063027d7dacSJiri Slaby 30644d90bb14SPeter Hurley lockdep_assert_held_once(&uport->lock); 30654d90bb14SPeter Hurley 3066c993257bSPeter Hurley if (tty) { 3067c993257bSPeter Hurley ld = tty_ldisc_ref(tty); 306842381572SGeorge Spelvin if (ld) { 306942381572SGeorge Spelvin if (ld->ops->dcd_change) 3070593fb1aeSGeorge Spelvin ld->ops->dcd_change(tty, status); 307142381572SGeorge Spelvin tty_ldisc_deref(ld); 307242381572SGeorge Spelvin } 3073c993257bSPeter Hurley } 3074027d7dacSJiri Slaby 3075027d7dacSJiri Slaby uport->icount.dcd++; 3076027d7dacSJiri Slaby 3077299245a1SPeter Hurley if (uart_dcd_enabled(uport)) { 3078027d7dacSJiri Slaby if (status) 3079027d7dacSJiri Slaby wake_up_interruptible(&port->open_wait); 308043eca0aeSAlan Cox else if (tty) 308143eca0aeSAlan Cox tty_hangup(tty); 3082027d7dacSJiri Slaby } 3083027d7dacSJiri Slaby } 3084027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_handle_dcd_change); 3085027d7dacSJiri Slaby 3086027d7dacSJiri Slaby /** 3087027d7dacSJiri Slaby * uart_handle_cts_change - handle a change of clear-to-send state 3088027d7dacSJiri Slaby * @uport: uart_port structure for the open port 3089027d7dacSJiri Slaby * @status: new clear to send status, nonzero if active 30904d90bb14SPeter Hurley * 30914d90bb14SPeter Hurley * Caller must hold uport->lock 3092027d7dacSJiri Slaby */ 3093027d7dacSJiri Slaby void uart_handle_cts_change(struct uart_port *uport, unsigned int status) 3094027d7dacSJiri Slaby { 30954d90bb14SPeter Hurley lockdep_assert_held_once(&uport->lock); 30964d90bb14SPeter Hurley 3097027d7dacSJiri Slaby uport->icount.cts++; 3098027d7dacSJiri Slaby 3099391f93f2SPeter Hurley if (uart_softcts_mode(uport)) { 3100d01f4d18SPeter Hurley if (uport->hw_stopped) { 3101027d7dacSJiri Slaby if (status) { 3102d01f4d18SPeter Hurley uport->hw_stopped = 0; 3103027d7dacSJiri Slaby uport->ops->start_tx(uport); 3104027d7dacSJiri Slaby uart_write_wakeup(uport); 3105027d7dacSJiri Slaby } 3106027d7dacSJiri Slaby } else { 3107027d7dacSJiri Slaby if (!status) { 3108d01f4d18SPeter Hurley uport->hw_stopped = 1; 3109027d7dacSJiri Slaby uport->ops->stop_tx(uport); 3110027d7dacSJiri Slaby } 3111027d7dacSJiri Slaby } 3112391f93f2SPeter Hurley 3113027d7dacSJiri Slaby } 3114027d7dacSJiri Slaby } 3115027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_handle_cts_change); 3116027d7dacSJiri Slaby 3117cf75525fSJiri Slaby /** 3118cf75525fSJiri Slaby * uart_insert_char - push a char to the uart layer 3119cf75525fSJiri Slaby * 3120cf75525fSJiri Slaby * User is responsible to call tty_flip_buffer_push when they are done with 3121cf75525fSJiri Slaby * insertion. 3122cf75525fSJiri Slaby * 3123cf75525fSJiri Slaby * @port: corresponding port 3124cf75525fSJiri Slaby * @status: state of the serial port RX buffer (LSR for 8250) 3125cf75525fSJiri Slaby * @overrun: mask of overrun bits in @status 3126cf75525fSJiri Slaby * @ch: character to push 3127cf75525fSJiri Slaby * @flag: flag for the character (see TTY_NORMAL and friends) 3128cf75525fSJiri Slaby */ 3129027d7dacSJiri Slaby void uart_insert_char(struct uart_port *port, unsigned int status, 3130027d7dacSJiri Slaby unsigned int overrun, unsigned int ch, unsigned int flag) 3131027d7dacSJiri Slaby { 313292a19f9cSJiri Slaby struct tty_port *tport = &port->state->port; 3133027d7dacSJiri Slaby 3134027d7dacSJiri Slaby if ((status & port->ignore_status_mask & ~overrun) == 0) 313592a19f9cSJiri Slaby if (tty_insert_flip_char(tport, ch, flag) == 0) 3136dabfb351SCorbin ++port->icount.buf_overrun; 3137027d7dacSJiri Slaby 3138027d7dacSJiri Slaby /* 3139027d7dacSJiri Slaby * Overrun is special. Since it's reported immediately, 3140027d7dacSJiri Slaby * it doesn't affect the current character. 3141027d7dacSJiri Slaby */ 3142027d7dacSJiri Slaby if (status & ~port->ignore_status_mask & overrun) 314392a19f9cSJiri Slaby if (tty_insert_flip_char(tport, 0, TTY_OVERRUN) == 0) 3144dabfb351SCorbin ++port->icount.buf_overrun; 3145027d7dacSJiri Slaby } 3146027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_insert_char); 3147027d7dacSJiri Slaby 314868af4317SDmitry Safonov #ifdef CONFIG_MAGIC_SYSRQ_SERIAL 314968af4317SDmitry Safonov static const char sysrq_toggle_seq[] = CONFIG_MAGIC_SYSRQ_SERIAL_SEQUENCE; 315068af4317SDmitry Safonov 315168af4317SDmitry Safonov static void uart_sysrq_on(struct work_struct *w) 315268af4317SDmitry Safonov { 3153b18896ffSAndy Shevchenko int sysrq_toggle_seq_len = strlen(sysrq_toggle_seq); 3154b18896ffSAndy Shevchenko 315568af4317SDmitry Safonov sysrq_toggle_support(1); 3156b18896ffSAndy Shevchenko pr_info("SysRq is enabled by magic sequence '%*pE' on serial\n", 3157b18896ffSAndy Shevchenko sysrq_toggle_seq_len, sysrq_toggle_seq); 315868af4317SDmitry Safonov } 315968af4317SDmitry Safonov static DECLARE_WORK(sysrq_enable_work, uart_sysrq_on); 316068af4317SDmitry Safonov 316168af4317SDmitry Safonov /** 316268af4317SDmitry Safonov * uart_try_toggle_sysrq - Enables SysRq from serial line 316368af4317SDmitry Safonov * @port: uart_port structure where char(s) after BREAK met 316468af4317SDmitry Safonov * @ch: new character in the sequence after received BREAK 316568af4317SDmitry Safonov * 316668af4317SDmitry Safonov * Enables magic SysRq when the required sequence is met on port 316768af4317SDmitry Safonov * (see CONFIG_MAGIC_SYSRQ_SERIAL_SEQUENCE). 316868af4317SDmitry Safonov * 316968af4317SDmitry Safonov * Returns false if @ch is out of enabling sequence and should be 317068af4317SDmitry Safonov * handled some other way, true if @ch was consumed. 317168af4317SDmitry Safonov */ 317208d54703SJohan Hovold bool uart_try_toggle_sysrq(struct uart_port *port, unsigned int ch) 317368af4317SDmitry Safonov { 31742ce5eaceSAndy Shevchenko int sysrq_toggle_seq_len = strlen(sysrq_toggle_seq); 31752ce5eaceSAndy Shevchenko 31762ce5eaceSAndy Shevchenko if (!sysrq_toggle_seq_len) 317768af4317SDmitry Safonov return false; 317868af4317SDmitry Safonov 317968af4317SDmitry Safonov BUILD_BUG_ON(ARRAY_SIZE(sysrq_toggle_seq) >= U8_MAX); 318068af4317SDmitry Safonov if (sysrq_toggle_seq[port->sysrq_seq] != ch) { 318168af4317SDmitry Safonov port->sysrq_seq = 0; 318268af4317SDmitry Safonov return false; 318368af4317SDmitry Safonov } 318468af4317SDmitry Safonov 31852ce5eaceSAndy Shevchenko if (++port->sysrq_seq < sysrq_toggle_seq_len) { 318668af4317SDmitry Safonov port->sysrq = jiffies + SYSRQ_TIMEOUT; 318768af4317SDmitry Safonov return true; 318868af4317SDmitry Safonov } 318968af4317SDmitry Safonov 319068af4317SDmitry Safonov schedule_work(&sysrq_enable_work); 319168af4317SDmitry Safonov 319268af4317SDmitry Safonov port->sysrq = 0; 319368af4317SDmitry Safonov return true; 319468af4317SDmitry Safonov } 319508d54703SJohan Hovold EXPORT_SYMBOL_GPL(uart_try_toggle_sysrq); 319668af4317SDmitry Safonov #endif 319768af4317SDmitry Safonov 3198ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_write_wakeup); 3199ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_register_driver); 3200ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_unregister_driver); 3201ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_suspend_port); 3202ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_resume_port); 3203ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_add_one_port); 3204ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_remove_one_port); 3205ab4382d2SGreg Kroah-Hartman 3206ef838a81SUwe Kleine-König /** 3207743f93f8SLukas Wunner * uart_get_rs485_mode() - retrieve rs485 properties for given uart 3208a7172561SRandy Dunlap * @port: uart device's target port 3209ef838a81SUwe Kleine-König * 3210ef838a81SUwe Kleine-König * This function implements the device tree binding described in 3211ef838a81SUwe Kleine-König * Documentation/devicetree/bindings/serial/rs485.txt. 3212ef838a81SUwe Kleine-König */ 3213c150c0f3SLukas Wunner int uart_get_rs485_mode(struct uart_port *port) 3214ef838a81SUwe Kleine-König { 3215c150c0f3SLukas Wunner struct serial_rs485 *rs485conf = &port->rs485; 3216c150c0f3SLukas Wunner struct device *dev = port->dev; 3217ef838a81SUwe Kleine-König u32 rs485_delay[2]; 3218ef838a81SUwe Kleine-König int ret; 3219ef838a81SUwe Kleine-König 3220743f93f8SLukas Wunner ret = device_property_read_u32_array(dev, "rs485-rts-delay", 3221743f93f8SLukas Wunner rs485_delay, 2); 3222ef838a81SUwe Kleine-König if (!ret) { 3223ef838a81SUwe Kleine-König rs485conf->delay_rts_before_send = rs485_delay[0]; 3224ef838a81SUwe Kleine-König rs485conf->delay_rts_after_send = rs485_delay[1]; 3225ef838a81SUwe Kleine-König } else { 3226ef838a81SUwe Kleine-König rs485conf->delay_rts_before_send = 0; 3227ef838a81SUwe Kleine-König rs485conf->delay_rts_after_send = 0; 3228ef838a81SUwe Kleine-König } 3229ef838a81SUwe Kleine-König 3230ef838a81SUwe Kleine-König /* 3231f1e5b618SLukas Wunner * Clear full-duplex and enabled flags, set RTS polarity to active high 3232f1e5b618SLukas Wunner * to get to a defined state with the following properties: 3233ef838a81SUwe Kleine-König */ 3234f1e5b618SLukas Wunner rs485conf->flags &= ~(SER_RS485_RX_DURING_TX | SER_RS485_ENABLED | 3235d58a2df3SLukas Wunner SER_RS485_TERMINATE_BUS | 3236f1e5b618SLukas Wunner SER_RS485_RTS_AFTER_SEND); 3237f1e5b618SLukas Wunner rs485conf->flags |= SER_RS485_RTS_ON_SEND; 3238ef838a81SUwe Kleine-König 3239743f93f8SLukas Wunner if (device_property_read_bool(dev, "rs485-rx-during-tx")) 3240ef838a81SUwe Kleine-König rs485conf->flags |= SER_RS485_RX_DURING_TX; 3241ef838a81SUwe Kleine-König 3242743f93f8SLukas Wunner if (device_property_read_bool(dev, "linux,rs485-enabled-at-boot-time")) 3243ef838a81SUwe Kleine-König rs485conf->flags |= SER_RS485_ENABLED; 3244f1e5b618SLukas Wunner 3245f1e5b618SLukas Wunner if (device_property_read_bool(dev, "rs485-rts-active-low")) { 3246f1e5b618SLukas Wunner rs485conf->flags &= ~SER_RS485_RTS_ON_SEND; 3247f1e5b618SLukas Wunner rs485conf->flags |= SER_RS485_RTS_AFTER_SEND; 3248f1e5b618SLukas Wunner } 3249c150c0f3SLukas Wunner 3250d58a2df3SLukas Wunner /* 3251d58a2df3SLukas Wunner * Disabling termination by default is the safe choice: Else if many 3252d58a2df3SLukas Wunner * bus participants enable it, no communication is possible at all. 3253d58a2df3SLukas Wunner * Works fine for short cables and users may enable for longer cables. 3254d58a2df3SLukas Wunner */ 3255d58a2df3SLukas Wunner port->rs485_term_gpio = devm_gpiod_get_optional(dev, "rs485-term", 3256d58a2df3SLukas Wunner GPIOD_OUT_LOW); 3257d58a2df3SLukas Wunner if (IS_ERR(port->rs485_term_gpio)) { 3258d58a2df3SLukas Wunner ret = PTR_ERR(port->rs485_term_gpio); 3259d58a2df3SLukas Wunner port->rs485_term_gpio = NULL; 326089c65d66SKrzysztof Kozlowski return dev_err_probe(dev, ret, "Cannot get rs485-term-gpios\n"); 3261d58a2df3SLukas Wunner } 3262d58a2df3SLukas Wunner 3263c150c0f3SLukas Wunner return 0; 3264ef838a81SUwe Kleine-König } 3265743f93f8SLukas Wunner EXPORT_SYMBOL_GPL(uart_get_rs485_mode); 3266ef838a81SUwe Kleine-König 3267ab4382d2SGreg Kroah-Hartman MODULE_DESCRIPTION("Serial driver core"); 3268ab4382d2SGreg Kroah-Hartman MODULE_LICENSE("GPL"); 3269