1e3b3d0f5SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0+ 2ab4382d2SGreg Kroah-Hartman /* 3ab4382d2SGreg Kroah-Hartman * Driver core for serial ports 4ab4382d2SGreg Kroah-Hartman * 5ab4382d2SGreg Kroah-Hartman * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. 6ab4382d2SGreg Kroah-Hartman * 7ab4382d2SGreg Kroah-Hartman * Copyright 1999 ARM Limited 8ab4382d2SGreg Kroah-Hartman * Copyright (C) 2000-2001 Deep Blue Solutions Ltd. 9ab4382d2SGreg Kroah-Hartman */ 10ab4382d2SGreg Kroah-Hartman #include <linux/module.h> 11ab4382d2SGreg Kroah-Hartman #include <linux/tty.h> 12027d7dacSJiri Slaby #include <linux/tty_flip.h> 13ab4382d2SGreg Kroah-Hartman #include <linux/slab.h> 14174cd4b1SIngo Molnar #include <linux/sched/signal.h> 15ab4382d2SGreg Kroah-Hartman #include <linux/init.h> 16ab4382d2SGreg Kroah-Hartman #include <linux/console.h> 17a208ffd2SGrant Likely #include <linux/of.h> 18ab4382d2SGreg Kroah-Hartman #include <linux/proc_fs.h> 19ab4382d2SGreg Kroah-Hartman #include <linux/seq_file.h> 20ab4382d2SGreg Kroah-Hartman #include <linux/device.h> 21ab4382d2SGreg Kroah-Hartman #include <linux/serial.h> /* for serial_state and serial_icounter_struct */ 22ab4382d2SGreg Kroah-Hartman #include <linux/serial_core.h> 23ab4382d2SGreg Kroah-Hartman #include <linux/delay.h> 24ab4382d2SGreg Kroah-Hartman #include <linux/mutex.h> 25ab4382d2SGreg Kroah-Hartman 26aef3ad10SAndy Shevchenko #include <linux/irq.h> 277c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 28ab4382d2SGreg Kroah-Hartman 29ab4382d2SGreg Kroah-Hartman /* 30ab4382d2SGreg Kroah-Hartman * This is used to lock changes in serial line configuration. 31ab4382d2SGreg Kroah-Hartman */ 32ab4382d2SGreg Kroah-Hartman static DEFINE_MUTEX(port_mutex); 33ab4382d2SGreg Kroah-Hartman 34ab4382d2SGreg Kroah-Hartman /* 35ab4382d2SGreg Kroah-Hartman * lockdep: port->lock is initialized in two places, but we 36ab4382d2SGreg Kroah-Hartman * want only one lock-class: 37ab4382d2SGreg Kroah-Hartman */ 38ab4382d2SGreg Kroah-Hartman static struct lock_class_key port_lock_key; 39ab4382d2SGreg Kroah-Hartman 40ab4382d2SGreg Kroah-Hartman #define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8) 41ab4382d2SGreg Kroah-Hartman 42ab4382d2SGreg Kroah-Hartman static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, 43ab4382d2SGreg Kroah-Hartman struct ktermios *old_termios); 441f33a51dSJiri Slaby static void uart_wait_until_sent(struct tty_struct *tty, int timeout); 456f538fe3SLinus Walleij static void uart_change_pm(struct uart_state *state, 466f538fe3SLinus Walleij enum uart_pm_state pm_state); 47ab4382d2SGreg Kroah-Hartman 48b922e19dSJiri Slaby static void uart_port_shutdown(struct tty_port *port); 49b922e19dSJiri Slaby 50299245a1SPeter Hurley static int uart_dcd_enabled(struct uart_port *uport) 51299245a1SPeter Hurley { 52d4260b51SPeter Hurley return !!(uport->status & UPSTAT_DCD_ENABLE); 53299245a1SPeter Hurley } 54299245a1SPeter Hurley 559ed19428SPeter Hurley static inline struct uart_port *uart_port_ref(struct uart_state *state) 569ed19428SPeter Hurley { 579ed19428SPeter Hurley if (atomic_add_unless(&state->refcount, 1, 0)) 589ed19428SPeter Hurley return state->uart_port; 599ed19428SPeter Hurley return NULL; 609ed19428SPeter Hurley } 619ed19428SPeter Hurley 629ed19428SPeter Hurley static inline void uart_port_deref(struct uart_port *uport) 639ed19428SPeter Hurley { 64ef510beaSAndy Shevchenko if (atomic_dec_and_test(&uport->state->refcount)) 659ed19428SPeter Hurley wake_up(&uport->state->remove_wait); 669ed19428SPeter Hurley } 679ed19428SPeter Hurley 689ed19428SPeter Hurley #define uart_port_lock(state, flags) \ 699ed19428SPeter Hurley ({ \ 709ed19428SPeter Hurley struct uart_port *__uport = uart_port_ref(state); \ 719ed19428SPeter Hurley if (__uport) \ 729ed19428SPeter Hurley spin_lock_irqsave(&__uport->lock, flags); \ 739ed19428SPeter Hurley __uport; \ 749ed19428SPeter Hurley }) 759ed19428SPeter Hurley 769ed19428SPeter Hurley #define uart_port_unlock(uport, flags) \ 779ed19428SPeter Hurley ({ \ 789ed19428SPeter Hurley struct uart_port *__uport = uport; \ 79ef510beaSAndy Shevchenko if (__uport) { \ 809ed19428SPeter Hurley spin_unlock_irqrestore(&__uport->lock, flags); \ 819ed19428SPeter Hurley uart_port_deref(__uport); \ 82ef510beaSAndy Shevchenko } \ 839ed19428SPeter Hurley }) 849ed19428SPeter Hurley 854047b371SPeter Hurley static inline struct uart_port *uart_port_check(struct uart_state *state) 864047b371SPeter Hurley { 877da4b8b7SPeter Hurley lockdep_assert_held(&state->port.mutex); 884047b371SPeter Hurley return state->uart_port; 894047b371SPeter Hurley } 904047b371SPeter Hurley 91ab4382d2SGreg Kroah-Hartman /* 92ab4382d2SGreg Kroah-Hartman * This routine is used by the interrupt handler to schedule processing in 93ab4382d2SGreg Kroah-Hartman * the software interrupt portion of the driver. 94ab4382d2SGreg Kroah-Hartman */ 95ab4382d2SGreg Kroah-Hartman void uart_write_wakeup(struct uart_port *port) 96ab4382d2SGreg Kroah-Hartman { 97ab4382d2SGreg Kroah-Hartman struct uart_state *state = port->state; 98ab4382d2SGreg Kroah-Hartman /* 99ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 100ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 101ab4382d2SGreg Kroah-Hartman */ 102ab4382d2SGreg Kroah-Hartman BUG_ON(!state); 103d0f4bce2SRob Herring tty_port_tty_wakeup(&state->port); 104ab4382d2SGreg Kroah-Hartman } 105ab4382d2SGreg Kroah-Hartman 106ab4382d2SGreg Kroah-Hartman static void uart_stop(struct tty_struct *tty) 107ab4382d2SGreg Kroah-Hartman { 108ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1099ed19428SPeter Hurley struct uart_port *port; 110ab4382d2SGreg Kroah-Hartman unsigned long flags; 111ab4382d2SGreg Kroah-Hartman 1129ed19428SPeter Hurley port = uart_port_lock(state, flags); 1139ed19428SPeter Hurley if (port) 114ab4382d2SGreg Kroah-Hartman port->ops->stop_tx(port); 1159ed19428SPeter Hurley uart_port_unlock(port, flags); 116ab4382d2SGreg Kroah-Hartman } 117ab4382d2SGreg Kroah-Hartman 118ab4382d2SGreg Kroah-Hartman static void __uart_start(struct tty_struct *tty) 119ab4382d2SGreg Kroah-Hartman { 120ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 121ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 122ab4382d2SGreg Kroah-Hartman 1239ed19428SPeter Hurley if (port && !uart_tx_stopped(port)) 124ab4382d2SGreg Kroah-Hartman port->ops->start_tx(port); 125ab4382d2SGreg Kroah-Hartman } 126ab4382d2SGreg Kroah-Hartman 127ab4382d2SGreg Kroah-Hartman static void uart_start(struct tty_struct *tty) 128ab4382d2SGreg Kroah-Hartman { 129ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1309ed19428SPeter Hurley struct uart_port *port; 131ab4382d2SGreg Kroah-Hartman unsigned long flags; 132ab4382d2SGreg Kroah-Hartman 133fedb5760SGreg Kroah-Hartman if (!state) 134fedb5760SGreg Kroah-Hartman return; 135fedb5760SGreg 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); 187ab4382d2SGreg Kroah-Hartman unsigned long page; 188a5ba1d95STycho Andersen unsigned long flags = 0; 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; 225c7d7abffSJiri Slaby uport->cons->cflag = 0; 226c7d7abffSJiri Slaby } 227ab4382d2SGreg Kroah-Hartman /* 228ab4382d2SGreg Kroah-Hartman * Initialise the hardware port settings. 229ab4382d2SGreg Kroah-Hartman */ 230ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 231ab4382d2SGreg Kroah-Hartman 232ab4382d2SGreg Kroah-Hartman /* 233ab4382d2SGreg Kroah-Hartman * Setup the RTS and DTR signals once the 234ab4382d2SGreg Kroah-Hartman * port is open and ready to respond. 235ab4382d2SGreg Kroah-Hartman */ 2369db276f8SPeter Hurley if (init_hw && C_BAUD(tty)) 237a6845e1eSRafael Gago uart_port_dtr_rts(uport, 1); 238ab4382d2SGreg Kroah-Hartman } 239ab4382d2SGreg Kroah-Hartman 2400055197eSJiri Slaby /* 2410055197eSJiri Slaby * This is to allow setserial on this port. People may want to set 2420055197eSJiri Slaby * port/irq/type and then reconfigure the port properly if it failed 2430055197eSJiri Slaby * now. 2440055197eSJiri Slaby */ 245ab4382d2SGreg Kroah-Hartman if (retval && capable(CAP_SYS_ADMIN)) 246c0d92be6SJiri Slaby return 1; 247c0d92be6SJiri Slaby 248c0d92be6SJiri Slaby return retval; 249c0d92be6SJiri Slaby } 250c0d92be6SJiri Slaby 251c0d92be6SJiri Slaby static int uart_startup(struct tty_struct *tty, struct uart_state *state, 252c0d92be6SJiri Slaby int init_hw) 253c0d92be6SJiri Slaby { 254c0d92be6SJiri Slaby struct tty_port *port = &state->port; 255c0d92be6SJiri Slaby int retval; 256c0d92be6SJiri Slaby 257d41861caSPeter Hurley if (tty_port_initialized(port)) 258c0d92be6SJiri Slaby return 0; 259c0d92be6SJiri Slaby 260c0d92be6SJiri Slaby retval = uart_port_startup(tty, state, init_hw); 261b3b57646SRob Herring if (retval) 262b3b57646SRob Herring set_bit(TTY_IO_ERROR, &tty->flags); 263ab4382d2SGreg Kroah-Hartman 264ab4382d2SGreg Kroah-Hartman return retval; 265ab4382d2SGreg Kroah-Hartman } 266ab4382d2SGreg Kroah-Hartman 267ab4382d2SGreg Kroah-Hartman /* 268ab4382d2SGreg Kroah-Hartman * This routine will shutdown a serial port; interrupts are disabled, and 269ab4382d2SGreg Kroah-Hartman * DTR is dropped if the hangup on close termio flag is on. Calls to 270ab4382d2SGreg Kroah-Hartman * uart_shutdown are serialised by the per-port semaphore. 271af224ca2SPeter Hurley * 272af224ca2SPeter Hurley * uport == NULL if uart_port has already been removed 273ab4382d2SGreg Kroah-Hartman */ 274ab4382d2SGreg Kroah-Hartman static void uart_shutdown(struct tty_struct *tty, struct uart_state *state) 275ab4382d2SGreg Kroah-Hartman { 2764047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 277ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 278a5ba1d95STycho Andersen unsigned long flags = 0; 279d7240214SSergey Senozhatsky char *xmit_buf = NULL; 280ab4382d2SGreg Kroah-Hartman 281ab4382d2SGreg Kroah-Hartman /* 282ab4382d2SGreg Kroah-Hartman * Set the TTY IO error marker 283ab4382d2SGreg Kroah-Hartman */ 284ab4382d2SGreg Kroah-Hartman if (tty) 285ab4382d2SGreg Kroah-Hartman set_bit(TTY_IO_ERROR, &tty->flags); 286ab4382d2SGreg Kroah-Hartman 287d41861caSPeter Hurley if (tty_port_initialized(port)) { 288d41861caSPeter Hurley tty_port_set_initialized(port, 0); 289d41861caSPeter Hurley 290ab4382d2SGreg Kroah-Hartman /* 291ab4382d2SGreg Kroah-Hartman * Turn off DTR and RTS early. 292ab4382d2SGreg Kroah-Hartman */ 293af224ca2SPeter Hurley if (uport && uart_console(uport) && tty) 294ae84db96SPeter Hurley uport->cons->cflag = tty->termios.c_cflag; 295ae84db96SPeter Hurley 2969db276f8SPeter Hurley if (!tty || C_HUPCL(tty)) 297a6845e1eSRafael Gago uart_port_dtr_rts(uport, 0); 298ab4382d2SGreg Kroah-Hartman 299b922e19dSJiri Slaby uart_port_shutdown(port); 300ab4382d2SGreg Kroah-Hartman } 301ab4382d2SGreg Kroah-Hartman 302ab4382d2SGreg Kroah-Hartman /* 303d208a3bfSDoug Anderson * It's possible for shutdown to be called after suspend if we get 304d208a3bfSDoug Anderson * a DCD drop (hangup) at just the right time. Clear suspended bit so 305d208a3bfSDoug Anderson * we don't try to resume a port that has been shutdown. 306ab4382d2SGreg Kroah-Hartman */ 30780f02d54SPeter Hurley tty_port_set_suspended(port, 0); 308ab4382d2SGreg Kroah-Hartman 309ab4382d2SGreg Kroah-Hartman /* 310d7240214SSergey Senozhatsky * Do not free() the transmit buffer page under the port lock since 311d7240214SSergey Senozhatsky * this can create various circular locking scenarios. For instance, 312d7240214SSergey Senozhatsky * console driver may need to allocate/free a debug object, which 313d7240214SSergey Senozhatsky * can endup in printk() recursion. 314ab4382d2SGreg Kroah-Hartman */ 315a5ba1d95STycho Andersen uart_port_lock(state, flags); 316d7240214SSergey Senozhatsky xmit_buf = state->xmit.buf; 317ab4382d2SGreg Kroah-Hartman state->xmit.buf = NULL; 318a5ba1d95STycho Andersen uart_port_unlock(uport, flags); 319d7240214SSergey Senozhatsky 320d7240214SSergey Senozhatsky if (xmit_buf) 321d7240214SSergey Senozhatsky free_page((unsigned long)xmit_buf); 322ab4382d2SGreg Kroah-Hartman } 323ab4382d2SGreg Kroah-Hartman 324ab4382d2SGreg Kroah-Hartman /** 325ab4382d2SGreg Kroah-Hartman * uart_update_timeout - update per-port FIFO timeout. 326ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port 327ab4382d2SGreg Kroah-Hartman * @cflag: termios cflag value 328ab4382d2SGreg Kroah-Hartman * @baud: speed of the port 329ab4382d2SGreg Kroah-Hartman * 330ab4382d2SGreg Kroah-Hartman * Set the port FIFO timeout value. The @cflag value should 331ab4382d2SGreg Kroah-Hartman * reflect the actual hardware settings. 332ab4382d2SGreg Kroah-Hartman */ 333ab4382d2SGreg Kroah-Hartman void 334ab4382d2SGreg Kroah-Hartman uart_update_timeout(struct uart_port *port, unsigned int cflag, 335ab4382d2SGreg Kroah-Hartman unsigned int baud) 336ab4382d2SGreg Kroah-Hartman { 337ab4382d2SGreg Kroah-Hartman unsigned int bits; 338ab4382d2SGreg Kroah-Hartman 339ab4382d2SGreg Kroah-Hartman /* byte size and parity */ 340ab4382d2SGreg Kroah-Hartman switch (cflag & CSIZE) { 341ab4382d2SGreg Kroah-Hartman case CS5: 342ab4382d2SGreg Kroah-Hartman bits = 7; 343ab4382d2SGreg Kroah-Hartman break; 344ab4382d2SGreg Kroah-Hartman case CS6: 345ab4382d2SGreg Kroah-Hartman bits = 8; 346ab4382d2SGreg Kroah-Hartman break; 347ab4382d2SGreg Kroah-Hartman case CS7: 348ab4382d2SGreg Kroah-Hartman bits = 9; 349ab4382d2SGreg Kroah-Hartman break; 350ab4382d2SGreg Kroah-Hartman default: 351ab4382d2SGreg Kroah-Hartman bits = 10; 352ab4382d2SGreg Kroah-Hartman break; /* CS8 */ 353ab4382d2SGreg Kroah-Hartman } 354ab4382d2SGreg Kroah-Hartman 355ab4382d2SGreg Kroah-Hartman if (cflag & CSTOPB) 356ab4382d2SGreg Kroah-Hartman bits++; 357ab4382d2SGreg Kroah-Hartman if (cflag & PARENB) 358ab4382d2SGreg Kroah-Hartman bits++; 359ab4382d2SGreg Kroah-Hartman 360ab4382d2SGreg Kroah-Hartman /* 361ab4382d2SGreg Kroah-Hartman * The total number of bits to be transmitted in the fifo. 362ab4382d2SGreg Kroah-Hartman */ 363ab4382d2SGreg Kroah-Hartman bits = bits * port->fifosize; 364ab4382d2SGreg Kroah-Hartman 365ab4382d2SGreg Kroah-Hartman /* 366ab4382d2SGreg Kroah-Hartman * Figure the timeout to send the above number of bits. 367ab4382d2SGreg Kroah-Hartman * Add .02 seconds of slop 368ab4382d2SGreg Kroah-Hartman */ 369ab4382d2SGreg Kroah-Hartman port->timeout = (HZ * bits) / baud + HZ/50; 370ab4382d2SGreg Kroah-Hartman } 371ab4382d2SGreg Kroah-Hartman 372ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_update_timeout); 373ab4382d2SGreg Kroah-Hartman 374ab4382d2SGreg Kroah-Hartman /** 375ab4382d2SGreg Kroah-Hartman * uart_get_baud_rate - return baud rate for a particular port 376ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port in question. 377ab4382d2SGreg Kroah-Hartman * @termios: desired termios settings. 378ab4382d2SGreg Kroah-Hartman * @old: old termios (or NULL) 379ab4382d2SGreg Kroah-Hartman * @min: minimum acceptable baud rate 380ab4382d2SGreg Kroah-Hartman * @max: maximum acceptable baud rate 381ab4382d2SGreg Kroah-Hartman * 382ab4382d2SGreg Kroah-Hartman * Decode the termios structure into a numeric baud rate, 383ab4382d2SGreg Kroah-Hartman * taking account of the magic 38400 baud rate (with spd_* 384ab4382d2SGreg Kroah-Hartman * flags), and mapping the %B0 rate to 9600 baud. 385ab4382d2SGreg Kroah-Hartman * 386ab4382d2SGreg Kroah-Hartman * If the new baud rate is invalid, try the old termios setting. 387ab4382d2SGreg Kroah-Hartman * If it's still invalid, we try 9600 baud. 388ab4382d2SGreg Kroah-Hartman * 389ab4382d2SGreg Kroah-Hartman * Update the @termios structure to reflect the baud rate 390ab4382d2SGreg Kroah-Hartman * we're actually going to be using. Don't do this for the case 391ab4382d2SGreg Kroah-Hartman * where B0 is requested ("hang up"). 392ab4382d2SGreg Kroah-Hartman */ 393ab4382d2SGreg Kroah-Hartman unsigned int 394ab4382d2SGreg Kroah-Hartman uart_get_baud_rate(struct uart_port *port, struct ktermios *termios, 395ab4382d2SGreg Kroah-Hartman struct ktermios *old, unsigned int min, unsigned int max) 396ab4382d2SGreg Kroah-Hartman { 397f10a2233SJoakim Nordell unsigned int try; 398f10a2233SJoakim Nordell unsigned int baud; 399f10a2233SJoakim Nordell unsigned int altbaud; 400ab4382d2SGreg Kroah-Hartman int hung_up = 0; 401ab4382d2SGreg Kroah-Hartman upf_t flags = port->flags & UPF_SPD_MASK; 402ab4382d2SGreg Kroah-Hartman 403f10a2233SJoakim Nordell switch (flags) { 404f10a2233SJoakim Nordell case UPF_SPD_HI: 405ab4382d2SGreg Kroah-Hartman altbaud = 57600; 406f10a2233SJoakim Nordell break; 407f10a2233SJoakim Nordell case UPF_SPD_VHI: 408ab4382d2SGreg Kroah-Hartman altbaud = 115200; 409f10a2233SJoakim Nordell break; 410f10a2233SJoakim Nordell case UPF_SPD_SHI: 411ab4382d2SGreg Kroah-Hartman altbaud = 230400; 412f10a2233SJoakim Nordell break; 413f10a2233SJoakim Nordell case UPF_SPD_WARP: 414ab4382d2SGreg Kroah-Hartman altbaud = 460800; 415f10a2233SJoakim Nordell break; 416f10a2233SJoakim Nordell default: 417f10a2233SJoakim Nordell altbaud = 38400; 418f10a2233SJoakim Nordell break; 419f10a2233SJoakim Nordell } 420ab4382d2SGreg Kroah-Hartman 421ab4382d2SGreg Kroah-Hartman for (try = 0; try < 2; try++) { 422ab4382d2SGreg Kroah-Hartman baud = tty_termios_baud_rate(termios); 423ab4382d2SGreg Kroah-Hartman 424ab4382d2SGreg Kroah-Hartman /* 425ab4382d2SGreg Kroah-Hartman * The spd_hi, spd_vhi, spd_shi, spd_warp kludge... 426ab4382d2SGreg Kroah-Hartman * Die! Die! Die! 427ab4382d2SGreg Kroah-Hartman */ 428547039ecSPeter Hurley if (try == 0 && baud == 38400) 429ab4382d2SGreg Kroah-Hartman baud = altbaud; 430ab4382d2SGreg Kroah-Hartman 431ab4382d2SGreg Kroah-Hartman /* 432ab4382d2SGreg Kroah-Hartman * Special case: B0 rate. 433ab4382d2SGreg Kroah-Hartman */ 434ab4382d2SGreg Kroah-Hartman if (baud == 0) { 435ab4382d2SGreg Kroah-Hartman hung_up = 1; 436ab4382d2SGreg Kroah-Hartman baud = 9600; 437ab4382d2SGreg Kroah-Hartman } 438ab4382d2SGreg Kroah-Hartman 439ab4382d2SGreg Kroah-Hartman if (baud >= min && baud <= max) 440ab4382d2SGreg Kroah-Hartman return baud; 441ab4382d2SGreg Kroah-Hartman 442ab4382d2SGreg Kroah-Hartman /* 443ab4382d2SGreg Kroah-Hartman * Oops, the quotient was zero. Try again with 444ab4382d2SGreg Kroah-Hartman * the old baud rate if possible. 445ab4382d2SGreg Kroah-Hartman */ 446ab4382d2SGreg Kroah-Hartman termios->c_cflag &= ~CBAUD; 447ab4382d2SGreg Kroah-Hartman if (old) { 448ab4382d2SGreg Kroah-Hartman baud = tty_termios_baud_rate(old); 449ab4382d2SGreg Kroah-Hartman if (!hung_up) 450ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 451ab4382d2SGreg Kroah-Hartman baud, baud); 452ab4382d2SGreg Kroah-Hartman old = NULL; 453ab4382d2SGreg Kroah-Hartman continue; 454ab4382d2SGreg Kroah-Hartman } 455ab4382d2SGreg Kroah-Hartman 456ab4382d2SGreg Kroah-Hartman /* 457ab4382d2SGreg Kroah-Hartman * As a last resort, if the range cannot be met then clip to 458ab4382d2SGreg Kroah-Hartman * the nearest chip supported rate. 459ab4382d2SGreg Kroah-Hartman */ 460ab4382d2SGreg Kroah-Hartman if (!hung_up) { 461ab4382d2SGreg Kroah-Hartman if (baud <= min) 462ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 463ab4382d2SGreg Kroah-Hartman min + 1, min + 1); 464ab4382d2SGreg Kroah-Hartman else 465ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 466ab4382d2SGreg Kroah-Hartman max - 1, max - 1); 467ab4382d2SGreg Kroah-Hartman } 468ab4382d2SGreg Kroah-Hartman } 469ab4382d2SGreg Kroah-Hartman /* Should never happen */ 470ab4382d2SGreg Kroah-Hartman WARN_ON(1); 471ab4382d2SGreg Kroah-Hartman return 0; 472ab4382d2SGreg Kroah-Hartman } 473ab4382d2SGreg Kroah-Hartman 474ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_get_baud_rate); 475ab4382d2SGreg Kroah-Hartman 476ab4382d2SGreg Kroah-Hartman /** 477ab4382d2SGreg Kroah-Hartman * uart_get_divisor - return uart clock divisor 478ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port. 479ab4382d2SGreg Kroah-Hartman * @baud: desired baud rate 480ab4382d2SGreg Kroah-Hartman * 481ab4382d2SGreg Kroah-Hartman * Calculate the uart clock divisor for the port. 482ab4382d2SGreg Kroah-Hartman */ 483ab4382d2SGreg Kroah-Hartman unsigned int 484ab4382d2SGreg Kroah-Hartman uart_get_divisor(struct uart_port *port, unsigned int baud) 485ab4382d2SGreg Kroah-Hartman { 486ab4382d2SGreg Kroah-Hartman unsigned int quot; 487ab4382d2SGreg Kroah-Hartman 488ab4382d2SGreg Kroah-Hartman /* 489ab4382d2SGreg Kroah-Hartman * Old custom speed handling. 490ab4382d2SGreg Kroah-Hartman */ 491ab4382d2SGreg Kroah-Hartman if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) 492ab4382d2SGreg Kroah-Hartman quot = port->custom_divisor; 493ab4382d2SGreg Kroah-Hartman else 49497d24634SUwe Kleine-König quot = DIV_ROUND_CLOSEST(port->uartclk, 16 * baud); 495ab4382d2SGreg Kroah-Hartman 496ab4382d2SGreg Kroah-Hartman return quot; 497ab4382d2SGreg Kroah-Hartman } 498ab4382d2SGreg Kroah-Hartman 499ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_get_divisor); 500ab4382d2SGreg Kroah-Hartman 5017c8ab967SPeter Hurley /* Caller holds port mutex */ 502ab4382d2SGreg Kroah-Hartman static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, 503ab4382d2SGreg Kroah-Hartman struct ktermios *old_termios) 504ab4382d2SGreg Kroah-Hartman { 5054047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 506ab4382d2SGreg Kroah-Hartman struct ktermios *termios; 507391f93f2SPeter Hurley int hw_stopped; 508ab4382d2SGreg Kroah-Hartman 509ab4382d2SGreg Kroah-Hartman /* 510ab4382d2SGreg Kroah-Hartman * If we have no tty, termios, or the port does not exist, 511ab4382d2SGreg Kroah-Hartman * then we can't set the parameters for this port. 512ab4382d2SGreg Kroah-Hartman */ 513adc8d746SAlan Cox if (!tty || uport->type == PORT_UNKNOWN) 514ab4382d2SGreg Kroah-Hartman return; 515ab4382d2SGreg Kroah-Hartman 516adc8d746SAlan Cox termios = &tty->termios; 517c18b55fdSPeter Hurley uport->ops->set_termios(uport, termios, old_termios); 518ab4382d2SGreg Kroah-Hartman 519ab4382d2SGreg Kroah-Hartman /* 520299245a1SPeter Hurley * Set modem status enables based on termios cflag 521ab4382d2SGreg Kroah-Hartman */ 522299245a1SPeter Hurley spin_lock_irq(&uport->lock); 523ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CRTSCTS) 524299245a1SPeter Hurley uport->status |= UPSTAT_CTS_ENABLE; 525ab4382d2SGreg Kroah-Hartman else 526299245a1SPeter Hurley uport->status &= ~UPSTAT_CTS_ENABLE; 527ab4382d2SGreg Kroah-Hartman 528ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CLOCAL) 529299245a1SPeter Hurley uport->status &= ~UPSTAT_DCD_ENABLE; 530ab4382d2SGreg Kroah-Hartman else 531299245a1SPeter Hurley uport->status |= UPSTAT_DCD_ENABLE; 532391f93f2SPeter Hurley 533391f93f2SPeter Hurley /* reset sw-assisted CTS flow control based on (possibly) new mode */ 534391f93f2SPeter Hurley hw_stopped = uport->hw_stopped; 535391f93f2SPeter Hurley uport->hw_stopped = uart_softcts_mode(uport) && 536391f93f2SPeter Hurley !(uport->ops->get_mctrl(uport) & TIOCM_CTS); 537391f93f2SPeter Hurley if (uport->hw_stopped) { 538391f93f2SPeter Hurley if (!hw_stopped) 539391f93f2SPeter Hurley uport->ops->stop_tx(uport); 540391f93f2SPeter Hurley } else { 541391f93f2SPeter Hurley if (hw_stopped) 542391f93f2SPeter Hurley __uart_start(tty); 543391f93f2SPeter Hurley } 544299245a1SPeter Hurley spin_unlock_irq(&uport->lock); 545ab4382d2SGreg Kroah-Hartman } 546ab4382d2SGreg Kroah-Hartman 547f5291eccSPeter Hurley static int uart_put_char(struct tty_struct *tty, unsigned char c) 548ab4382d2SGreg Kroah-Hartman { 549f5291eccSPeter Hurley struct uart_state *state = tty->driver_data; 5509ed19428SPeter Hurley struct uart_port *port; 551f5291eccSPeter Hurley struct circ_buf *circ; 552ab4382d2SGreg Kroah-Hartman unsigned long flags; 553ab4382d2SGreg Kroah-Hartman int ret = 0; 554ab4382d2SGreg Kroah-Hartman 555f5291eccSPeter Hurley circ = &state->xmit; 5569ed19428SPeter Hurley port = uart_port_lock(state, flags); 557aff9cf59SSamir Virmani if (!circ->buf) { 558aff9cf59SSamir Virmani uart_port_unlock(port, flags); 559aff9cf59SSamir Virmani return 0; 560aff9cf59SSamir Virmani } 561aff9cf59SSamir Virmani 5629ed19428SPeter Hurley if (port && uart_circ_chars_free(circ) != 0) { 563ab4382d2SGreg Kroah-Hartman circ->buf[circ->head] = c; 564ab4382d2SGreg Kroah-Hartman circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1); 565ab4382d2SGreg Kroah-Hartman ret = 1; 566ab4382d2SGreg Kroah-Hartman } 5679ed19428SPeter Hurley uart_port_unlock(port, flags); 568ab4382d2SGreg Kroah-Hartman return ret; 569ab4382d2SGreg Kroah-Hartman } 570ab4382d2SGreg Kroah-Hartman 571ab4382d2SGreg Kroah-Hartman static void uart_flush_chars(struct tty_struct *tty) 572ab4382d2SGreg Kroah-Hartman { 573ab4382d2SGreg Kroah-Hartman uart_start(tty); 574ab4382d2SGreg Kroah-Hartman } 575ab4382d2SGreg Kroah-Hartman 576ab4382d2SGreg Kroah-Hartman static int uart_write(struct tty_struct *tty, 577ab4382d2SGreg Kroah-Hartman const unsigned char *buf, int count) 578ab4382d2SGreg Kroah-Hartman { 579ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 580ab4382d2SGreg Kroah-Hartman struct uart_port *port; 581ab4382d2SGreg Kroah-Hartman struct circ_buf *circ; 582ab4382d2SGreg Kroah-Hartman unsigned long flags; 583ab4382d2SGreg Kroah-Hartman int c, ret = 0; 584ab4382d2SGreg Kroah-Hartman 585ab4382d2SGreg Kroah-Hartman /* 586ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 587ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 588ab4382d2SGreg Kroah-Hartman */ 589ab4382d2SGreg Kroah-Hartman if (!state) { 590ab4382d2SGreg Kroah-Hartman WARN_ON(1); 591ab4382d2SGreg Kroah-Hartman return -EL3HLT; 592ab4382d2SGreg Kroah-Hartman } 593ab4382d2SGreg Kroah-Hartman 5949ed19428SPeter Hurley port = uart_port_lock(state, flags); 595aff9cf59SSamir Virmani circ = &state->xmit; 596aff9cf59SSamir Virmani if (!circ->buf) { 597aff9cf59SSamir Virmani uart_port_unlock(port, flags); 598aff9cf59SSamir Virmani return 0; 599aff9cf59SSamir Virmani } 600aff9cf59SSamir Virmani 6019ed19428SPeter Hurley while (port) { 602ab4382d2SGreg Kroah-Hartman c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE); 603ab4382d2SGreg Kroah-Hartman if (count < c) 604ab4382d2SGreg Kroah-Hartman c = count; 605ab4382d2SGreg Kroah-Hartman if (c <= 0) 606ab4382d2SGreg Kroah-Hartman break; 607ab4382d2SGreg Kroah-Hartman memcpy(circ->buf + circ->head, buf, c); 608ab4382d2SGreg Kroah-Hartman circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1); 609ab4382d2SGreg Kroah-Hartman buf += c; 610ab4382d2SGreg Kroah-Hartman count -= c; 611ab4382d2SGreg Kroah-Hartman ret += c; 612ab4382d2SGreg Kroah-Hartman } 61364dbee31SPeter Hurley 61464dbee31SPeter Hurley __uart_start(tty); 6159ed19428SPeter Hurley uart_port_unlock(port, flags); 616ab4382d2SGreg Kroah-Hartman return ret; 617ab4382d2SGreg Kroah-Hartman } 618ab4382d2SGreg Kroah-Hartman 619ab4382d2SGreg Kroah-Hartman static int uart_write_room(struct tty_struct *tty) 620ab4382d2SGreg Kroah-Hartman { 621ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 6229ed19428SPeter Hurley struct uart_port *port; 623ab4382d2SGreg Kroah-Hartman unsigned long flags; 624ab4382d2SGreg Kroah-Hartman int ret; 625ab4382d2SGreg Kroah-Hartman 6269ed19428SPeter Hurley port = uart_port_lock(state, flags); 627ab4382d2SGreg Kroah-Hartman ret = uart_circ_chars_free(&state->xmit); 6289ed19428SPeter Hurley uart_port_unlock(port, flags); 629ab4382d2SGreg Kroah-Hartman return ret; 630ab4382d2SGreg Kroah-Hartman } 631ab4382d2SGreg Kroah-Hartman 632ab4382d2SGreg Kroah-Hartman static int uart_chars_in_buffer(struct tty_struct *tty) 633ab4382d2SGreg Kroah-Hartman { 634ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 6359ed19428SPeter Hurley struct uart_port *port; 636ab4382d2SGreg Kroah-Hartman unsigned long flags; 637ab4382d2SGreg Kroah-Hartman int ret; 638ab4382d2SGreg Kroah-Hartman 6399ed19428SPeter Hurley port = uart_port_lock(state, flags); 640ab4382d2SGreg Kroah-Hartman ret = uart_circ_chars_pending(&state->xmit); 6419ed19428SPeter Hurley uart_port_unlock(port, flags); 642ab4382d2SGreg Kroah-Hartman return ret; 643ab4382d2SGreg Kroah-Hartman } 644ab4382d2SGreg Kroah-Hartman 645ab4382d2SGreg Kroah-Hartman static void uart_flush_buffer(struct tty_struct *tty) 646ab4382d2SGreg Kroah-Hartman { 647ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 648ab4382d2SGreg Kroah-Hartman struct uart_port *port; 649ab4382d2SGreg Kroah-Hartman unsigned long flags; 650ab4382d2SGreg Kroah-Hartman 651ab4382d2SGreg Kroah-Hartman /* 652ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 653ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 654ab4382d2SGreg Kroah-Hartman */ 655ab4382d2SGreg Kroah-Hartman if (!state) { 656ab4382d2SGreg Kroah-Hartman WARN_ON(1); 657ab4382d2SGreg Kroah-Hartman return; 658ab4382d2SGreg Kroah-Hartman } 659ab4382d2SGreg Kroah-Hartman 660ab4382d2SGreg Kroah-Hartman pr_debug("uart_flush_buffer(%d) called\n", tty->index); 661ab4382d2SGreg Kroah-Hartman 6629ed19428SPeter Hurley port = uart_port_lock(state, flags); 6639ed19428SPeter Hurley if (!port) 6649ed19428SPeter Hurley return; 665ab4382d2SGreg Kroah-Hartman uart_circ_clear(&state->xmit); 666ab4382d2SGreg Kroah-Hartman if (port->ops->flush_buffer) 667ab4382d2SGreg Kroah-Hartman port->ops->flush_buffer(port); 6689ed19428SPeter Hurley uart_port_unlock(port, flags); 669d0f4bce2SRob Herring tty_port_tty_wakeup(&state->port); 670ab4382d2SGreg Kroah-Hartman } 671ab4382d2SGreg Kroah-Hartman 672ab4382d2SGreg Kroah-Hartman /* 673ab4382d2SGreg Kroah-Hartman * This function is used to send a high-priority XON/XOFF character to 674ab4382d2SGreg Kroah-Hartman * the device 675ab4382d2SGreg Kroah-Hartman */ 676ab4382d2SGreg Kroah-Hartman static void uart_send_xchar(struct tty_struct *tty, char ch) 677ab4382d2SGreg Kroah-Hartman { 678ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 6799ed19428SPeter Hurley struct uart_port *port; 680ab4382d2SGreg Kroah-Hartman unsigned long flags; 681ab4382d2SGreg Kroah-Hartman 6829ed19428SPeter Hurley port = uart_port_ref(state); 6839ed19428SPeter Hurley if (!port) 6849ed19428SPeter Hurley return; 6859ed19428SPeter Hurley 686ab4382d2SGreg Kroah-Hartman if (port->ops->send_xchar) 687ab4382d2SGreg Kroah-Hartman port->ops->send_xchar(port, ch); 688ab4382d2SGreg Kroah-Hartman else { 689ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 690c235ccc1SPeter Hurley port->x_char = ch; 691c235ccc1SPeter Hurley if (ch) 692ab4382d2SGreg Kroah-Hartman port->ops->start_tx(port); 693ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 694ab4382d2SGreg Kroah-Hartman } 6959ed19428SPeter Hurley uart_port_deref(port); 696ab4382d2SGreg Kroah-Hartman } 697ab4382d2SGreg Kroah-Hartman 698ab4382d2SGreg Kroah-Hartman static void uart_throttle(struct tty_struct *tty) 699ab4382d2SGreg Kroah-Hartman { 700ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 701c5f78b1fSJeremy Kerr upstat_t mask = UPSTAT_SYNC_FIFO; 7029ed19428SPeter Hurley struct uart_port *port; 703ab4382d2SGreg Kroah-Hartman 7049ed19428SPeter Hurley port = uart_port_ref(state); 7059ed19428SPeter Hurley if (!port) 7069ed19428SPeter Hurley return; 7079ed19428SPeter Hurley 708ab4382d2SGreg Kroah-Hartman if (I_IXOFF(tty)) 709391f93f2SPeter Hurley mask |= UPSTAT_AUTOXOFF; 7109db276f8SPeter Hurley if (C_CRTSCTS(tty)) 711391f93f2SPeter Hurley mask |= UPSTAT_AUTORTS; 7129aba8d5bSRussell King 713391f93f2SPeter Hurley if (port->status & mask) { 7149aba8d5bSRussell King port->ops->throttle(port); 715391f93f2SPeter Hurley mask &= ~port->status; 7169aba8d5bSRussell King } 7179aba8d5bSRussell King 718391f93f2SPeter Hurley if (mask & UPSTAT_AUTORTS) 7199aba8d5bSRussell King uart_clear_mctrl(port, TIOCM_RTS); 720b4749b97SPeter Hurley 721b4749b97SPeter Hurley if (mask & UPSTAT_AUTOXOFF) 722b4749b97SPeter Hurley uart_send_xchar(tty, STOP_CHAR(tty)); 7239ed19428SPeter Hurley 7249ed19428SPeter Hurley uart_port_deref(port); 725ab4382d2SGreg Kroah-Hartman } 726ab4382d2SGreg Kroah-Hartman 727ab4382d2SGreg Kroah-Hartman static void uart_unthrottle(struct tty_struct *tty) 728ab4382d2SGreg Kroah-Hartman { 729ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 730c5f78b1fSJeremy Kerr upstat_t mask = UPSTAT_SYNC_FIFO; 7319ed19428SPeter Hurley struct uart_port *port; 732ab4382d2SGreg Kroah-Hartman 733fedb5760SGreg Kroah-Hartman if (!state) 734fedb5760SGreg Kroah-Hartman return; 735fedb5760SGreg Kroah-Hartman 7369ed19428SPeter Hurley port = uart_port_ref(state); 7379ed19428SPeter Hurley if (!port) 7389ed19428SPeter Hurley return; 7399ed19428SPeter Hurley 7409aba8d5bSRussell King if (I_IXOFF(tty)) 741391f93f2SPeter Hurley mask |= UPSTAT_AUTOXOFF; 7429db276f8SPeter Hurley if (C_CRTSCTS(tty)) 743391f93f2SPeter Hurley mask |= UPSTAT_AUTORTS; 7449aba8d5bSRussell King 745391f93f2SPeter Hurley if (port->status & mask) { 7469aba8d5bSRussell King port->ops->unthrottle(port); 747391f93f2SPeter Hurley mask &= ~port->status; 7489aba8d5bSRussell King } 7499aba8d5bSRussell King 750391f93f2SPeter Hurley if (mask & UPSTAT_AUTORTS) 751ab4382d2SGreg Kroah-Hartman uart_set_mctrl(port, TIOCM_RTS); 752b4749b97SPeter Hurley 753b4749b97SPeter Hurley if (mask & UPSTAT_AUTOXOFF) 754b4749b97SPeter Hurley uart_send_xchar(tty, START_CHAR(tty)); 7559ed19428SPeter Hurley 7569ed19428SPeter Hurley uart_port_deref(port); 757ab4382d2SGreg Kroah-Hartman } 758ab4382d2SGreg Kroah-Hartman 7594047b371SPeter Hurley static int uart_get_info(struct tty_port *port, struct serial_struct *retinfo) 760ab4382d2SGreg Kroah-Hartman { 7619f109694SAlan Cox struct uart_state *state = container_of(port, struct uart_state, port); 7624047b371SPeter Hurley struct uart_port *uport; 7634047b371SPeter Hurley int ret = -ENODEV; 7647ba2e769SAlan Cox 76537cd0c99SFengguang Wu memset(retinfo, 0, sizeof(*retinfo)); 7667ba2e769SAlan Cox 7673abe8c76SPeter Hurley /* 7683abe8c76SPeter Hurley * Ensure the state we copy is consistent and no hardware changes 7693abe8c76SPeter Hurley * occur as we go 7703abe8c76SPeter Hurley */ 7713abe8c76SPeter Hurley mutex_lock(&port->mutex); 7724047b371SPeter Hurley uport = uart_port_check(state); 7734047b371SPeter Hurley if (!uport) 7744047b371SPeter Hurley goto out; 7754047b371SPeter Hurley 7767ba2e769SAlan Cox retinfo->type = uport->type; 7777ba2e769SAlan Cox retinfo->line = uport->line; 7787ba2e769SAlan Cox retinfo->port = uport->iobase; 7797ba2e769SAlan Cox if (HIGH_BITS_OFFSET) 7807ba2e769SAlan Cox retinfo->port_high = (long) uport->iobase >> HIGH_BITS_OFFSET; 7817ba2e769SAlan Cox retinfo->irq = uport->irq; 782a17e74c5SAndy Shevchenko retinfo->flags = (__force int)uport->flags; 7837ba2e769SAlan Cox retinfo->xmit_fifo_size = uport->fifosize; 7847ba2e769SAlan Cox retinfo->baud_base = uport->uartclk / 16; 7857ba2e769SAlan Cox retinfo->close_delay = jiffies_to_msecs(port->close_delay) / 10; 7867ba2e769SAlan Cox retinfo->closing_wait = port->closing_wait == ASYNC_CLOSING_WAIT_NONE ? 7877ba2e769SAlan Cox ASYNC_CLOSING_WAIT_NONE : 7887ba2e769SAlan Cox jiffies_to_msecs(port->closing_wait) / 10; 7897ba2e769SAlan Cox retinfo->custom_divisor = uport->custom_divisor; 7907ba2e769SAlan Cox retinfo->hub6 = uport->hub6; 7917ba2e769SAlan Cox retinfo->io_type = uport->iotype; 7927ba2e769SAlan Cox retinfo->iomem_reg_shift = uport->regshift; 7937ba2e769SAlan Cox retinfo->iomem_base = (void *)(unsigned long)uport->mapbase; 7944047b371SPeter Hurley 7954047b371SPeter Hurley ret = 0; 7964047b371SPeter Hurley out: 797ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 7984047b371SPeter Hurley return ret; 7999f109694SAlan Cox } 8009f109694SAlan Cox 8015099d234SAl Viro static int uart_get_info_user(struct tty_struct *tty, 8025099d234SAl Viro struct serial_struct *ss) 8039f109694SAlan Cox { 8045099d234SAl Viro struct uart_state *state = tty->driver_data; 8055099d234SAl Viro struct tty_port *port = &state->port; 8063abe8c76SPeter Hurley 8075099d234SAl Viro return uart_get_info(port, ss) < 0 ? -EIO : 0; 808ab4382d2SGreg Kroah-Hartman } 809ab4382d2SGreg Kroah-Hartman 8107ba2e769SAlan Cox static int uart_set_info(struct tty_struct *tty, struct tty_port *port, 8117ba2e769SAlan Cox struct uart_state *state, 8127ba2e769SAlan Cox struct serial_struct *new_info) 813ab4382d2SGreg Kroah-Hartman { 8144047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 815ab4382d2SGreg Kroah-Hartman unsigned long new_port; 816ab4382d2SGreg Kroah-Hartman unsigned int change_irq, change_port, closing_wait; 817ab4382d2SGreg Kroah-Hartman unsigned int old_custom_divisor, close_delay; 818ab4382d2SGreg Kroah-Hartman upf_t old_flags, new_flags; 819ab4382d2SGreg Kroah-Hartman int retval = 0; 820ab4382d2SGreg Kroah-Hartman 8214047b371SPeter Hurley if (!uport) 8224047b371SPeter Hurley return -EIO; 8234047b371SPeter Hurley 8247ba2e769SAlan Cox new_port = new_info->port; 825ab4382d2SGreg Kroah-Hartman if (HIGH_BITS_OFFSET) 8267ba2e769SAlan Cox new_port += (unsigned long) new_info->port_high << HIGH_BITS_OFFSET; 827ab4382d2SGreg Kroah-Hartman 8287ba2e769SAlan Cox new_info->irq = irq_canonicalize(new_info->irq); 8297ba2e769SAlan Cox close_delay = msecs_to_jiffies(new_info->close_delay * 10); 8307ba2e769SAlan Cox closing_wait = new_info->closing_wait == ASYNC_CLOSING_WAIT_NONE ? 8314cb0fbfdSJiri Slaby ASYNC_CLOSING_WAIT_NONE : 8327ba2e769SAlan Cox msecs_to_jiffies(new_info->closing_wait * 10); 833ab4382d2SGreg Kroah-Hartman 834ab4382d2SGreg Kroah-Hartman 835ab4382d2SGreg Kroah-Hartman change_irq = !(uport->flags & UPF_FIXED_PORT) 8367ba2e769SAlan Cox && new_info->irq != uport->irq; 837ab4382d2SGreg Kroah-Hartman 838ab4382d2SGreg Kroah-Hartman /* 839ab4382d2SGreg Kroah-Hartman * Since changing the 'type' of the port changes its resource 840ab4382d2SGreg Kroah-Hartman * allocations, we should treat type changes the same as 841ab4382d2SGreg Kroah-Hartman * IO port changes. 842ab4382d2SGreg Kroah-Hartman */ 843ab4382d2SGreg Kroah-Hartman change_port = !(uport->flags & UPF_FIXED_PORT) 844ab4382d2SGreg Kroah-Hartman && (new_port != uport->iobase || 8457ba2e769SAlan Cox (unsigned long)new_info->iomem_base != uport->mapbase || 8467ba2e769SAlan Cox new_info->hub6 != uport->hub6 || 8477ba2e769SAlan Cox new_info->io_type != uport->iotype || 8487ba2e769SAlan Cox new_info->iomem_reg_shift != uport->regshift || 8497ba2e769SAlan Cox new_info->type != uport->type); 850ab4382d2SGreg Kroah-Hartman 851ab4382d2SGreg Kroah-Hartman old_flags = uport->flags; 852a17e74c5SAndy Shevchenko new_flags = (__force upf_t)new_info->flags; 853ab4382d2SGreg Kroah-Hartman old_custom_divisor = uport->custom_divisor; 854ab4382d2SGreg Kroah-Hartman 855ab4382d2SGreg Kroah-Hartman if (!capable(CAP_SYS_ADMIN)) { 856ab4382d2SGreg Kroah-Hartman retval = -EPERM; 857ab4382d2SGreg Kroah-Hartman if (change_irq || change_port || 8587ba2e769SAlan Cox (new_info->baud_base != uport->uartclk / 16) || 859ab4382d2SGreg Kroah-Hartman (close_delay != port->close_delay) || 860ab4382d2SGreg Kroah-Hartman (closing_wait != port->closing_wait) || 8617ba2e769SAlan Cox (new_info->xmit_fifo_size && 8627ba2e769SAlan Cox new_info->xmit_fifo_size != uport->fifosize) || 863ab4382d2SGreg Kroah-Hartman (((new_flags ^ old_flags) & ~UPF_USR_MASK) != 0)) 864ab4382d2SGreg Kroah-Hartman goto exit; 865ab4382d2SGreg Kroah-Hartman uport->flags = ((uport->flags & ~UPF_USR_MASK) | 866ab4382d2SGreg Kroah-Hartman (new_flags & UPF_USR_MASK)); 8677ba2e769SAlan Cox uport->custom_divisor = new_info->custom_divisor; 868ab4382d2SGreg Kroah-Hartman goto check_and_exit; 869ab4382d2SGreg Kroah-Hartman } 870ab4382d2SGreg Kroah-Hartman 871ab4382d2SGreg Kroah-Hartman /* 872ab4382d2SGreg Kroah-Hartman * Ask the low level driver to verify the settings. 873ab4382d2SGreg Kroah-Hartman */ 874ab4382d2SGreg Kroah-Hartman if (uport->ops->verify_port) 8757ba2e769SAlan Cox retval = uport->ops->verify_port(uport, new_info); 876ab4382d2SGreg Kroah-Hartman 8777ba2e769SAlan Cox if ((new_info->irq >= nr_irqs) || (new_info->irq < 0) || 8787ba2e769SAlan Cox (new_info->baud_base < 9600)) 879ab4382d2SGreg Kroah-Hartman retval = -EINVAL; 880ab4382d2SGreg Kroah-Hartman 881ab4382d2SGreg Kroah-Hartman if (retval) 882ab4382d2SGreg Kroah-Hartman goto exit; 883ab4382d2SGreg Kroah-Hartman 884ab4382d2SGreg Kroah-Hartman if (change_port || change_irq) { 885ab4382d2SGreg Kroah-Hartman retval = -EBUSY; 886ab4382d2SGreg Kroah-Hartman 887ab4382d2SGreg Kroah-Hartman /* 888ab4382d2SGreg Kroah-Hartman * Make sure that we are the sole user of this port. 889ab4382d2SGreg Kroah-Hartman */ 890ab4382d2SGreg Kroah-Hartman if (tty_port_users(port) > 1) 891ab4382d2SGreg Kroah-Hartman goto exit; 892ab4382d2SGreg Kroah-Hartman 893ab4382d2SGreg Kroah-Hartman /* 894ab4382d2SGreg Kroah-Hartman * We need to shutdown the serial port at the old 895ab4382d2SGreg Kroah-Hartman * port/type/irq combination. 896ab4382d2SGreg Kroah-Hartman */ 897ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 898ab4382d2SGreg Kroah-Hartman } 899ab4382d2SGreg Kroah-Hartman 900ab4382d2SGreg Kroah-Hartman if (change_port) { 901ab4382d2SGreg Kroah-Hartman unsigned long old_iobase, old_mapbase; 902ab4382d2SGreg Kroah-Hartman unsigned int old_type, old_iotype, old_hub6, old_shift; 903ab4382d2SGreg Kroah-Hartman 904ab4382d2SGreg Kroah-Hartman old_iobase = uport->iobase; 905ab4382d2SGreg Kroah-Hartman old_mapbase = uport->mapbase; 906ab4382d2SGreg Kroah-Hartman old_type = uport->type; 907ab4382d2SGreg Kroah-Hartman old_hub6 = uport->hub6; 908ab4382d2SGreg Kroah-Hartman old_iotype = uport->iotype; 909ab4382d2SGreg Kroah-Hartman old_shift = uport->regshift; 910ab4382d2SGreg Kroah-Hartman 911ab4382d2SGreg Kroah-Hartman /* 912ab4382d2SGreg Kroah-Hartman * Free and release old regions 913ab4382d2SGreg Kroah-Hartman */ 914a7cfaf16SFabio Estevam if (old_type != PORT_UNKNOWN && uport->ops->release_port) 915ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 916ab4382d2SGreg Kroah-Hartman 917ab4382d2SGreg Kroah-Hartman uport->iobase = new_port; 9187ba2e769SAlan Cox uport->type = new_info->type; 9197ba2e769SAlan Cox uport->hub6 = new_info->hub6; 9207ba2e769SAlan Cox uport->iotype = new_info->io_type; 9217ba2e769SAlan Cox uport->regshift = new_info->iomem_reg_shift; 9227ba2e769SAlan Cox uport->mapbase = (unsigned long)new_info->iomem_base; 923ab4382d2SGreg Kroah-Hartman 924ab4382d2SGreg Kroah-Hartman /* 925ab4382d2SGreg Kroah-Hartman * Claim and map the new regions 926ab4382d2SGreg Kroah-Hartman */ 927a7cfaf16SFabio Estevam if (uport->type != PORT_UNKNOWN && uport->ops->request_port) { 928ab4382d2SGreg Kroah-Hartman retval = uport->ops->request_port(uport); 929ab4382d2SGreg Kroah-Hartman } else { 930ab4382d2SGreg Kroah-Hartman /* Always success - Jean II */ 931ab4382d2SGreg Kroah-Hartman retval = 0; 932ab4382d2SGreg Kroah-Hartman } 933ab4382d2SGreg Kroah-Hartman 934ab4382d2SGreg Kroah-Hartman /* 935ab4382d2SGreg Kroah-Hartman * If we fail to request resources for the 936ab4382d2SGreg Kroah-Hartman * new port, try to restore the old settings. 937ab4382d2SGreg Kroah-Hartman */ 9387deb39edSThomas Pfaff if (retval) { 939ab4382d2SGreg Kroah-Hartman uport->iobase = old_iobase; 940ab4382d2SGreg Kroah-Hartman uport->type = old_type; 941ab4382d2SGreg Kroah-Hartman uport->hub6 = old_hub6; 942ab4382d2SGreg Kroah-Hartman uport->iotype = old_iotype; 943ab4382d2SGreg Kroah-Hartman uport->regshift = old_shift; 944ab4382d2SGreg Kroah-Hartman uport->mapbase = old_mapbase; 9457deb39edSThomas Pfaff 9467deb39edSThomas Pfaff if (old_type != PORT_UNKNOWN) { 947ab4382d2SGreg Kroah-Hartman retval = uport->ops->request_port(uport); 948ab4382d2SGreg Kroah-Hartman /* 949ab4382d2SGreg Kroah-Hartman * If we failed to restore the old settings, 950ab4382d2SGreg Kroah-Hartman * we fail like this. 951ab4382d2SGreg Kroah-Hartman */ 952ab4382d2SGreg Kroah-Hartman if (retval) 953ab4382d2SGreg Kroah-Hartman uport->type = PORT_UNKNOWN; 954ab4382d2SGreg Kroah-Hartman 955ab4382d2SGreg Kroah-Hartman /* 956ab4382d2SGreg Kroah-Hartman * We failed anyway. 957ab4382d2SGreg Kroah-Hartman */ 958ab4382d2SGreg Kroah-Hartman retval = -EBUSY; 9597deb39edSThomas Pfaff } 9607deb39edSThomas Pfaff 961ab4382d2SGreg Kroah-Hartman /* Added to return the correct error -Ram Gupta */ 962ab4382d2SGreg Kroah-Hartman goto exit; 963ab4382d2SGreg Kroah-Hartman } 964ab4382d2SGreg Kroah-Hartman } 965ab4382d2SGreg Kroah-Hartman 966ab4382d2SGreg Kroah-Hartman if (change_irq) 9677ba2e769SAlan Cox uport->irq = new_info->irq; 968ab4382d2SGreg Kroah-Hartman if (!(uport->flags & UPF_FIXED_PORT)) 9697ba2e769SAlan Cox uport->uartclk = new_info->baud_base * 16; 970ab4382d2SGreg Kroah-Hartman uport->flags = (uport->flags & ~UPF_CHANGE_MASK) | 971ab4382d2SGreg Kroah-Hartman (new_flags & UPF_CHANGE_MASK); 9727ba2e769SAlan Cox uport->custom_divisor = new_info->custom_divisor; 973ab4382d2SGreg Kroah-Hartman port->close_delay = close_delay; 974ab4382d2SGreg Kroah-Hartman port->closing_wait = closing_wait; 9757ba2e769SAlan Cox if (new_info->xmit_fifo_size) 9767ba2e769SAlan Cox uport->fifosize = new_info->xmit_fifo_size; 977d6c53c0eSJiri Slaby port->low_latency = (uport->flags & UPF_LOW_LATENCY) ? 1 : 0; 978ab4382d2SGreg Kroah-Hartman 979ab4382d2SGreg Kroah-Hartman check_and_exit: 980ab4382d2SGreg Kroah-Hartman retval = 0; 981ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) 982ab4382d2SGreg Kroah-Hartman goto exit; 983d41861caSPeter Hurley if (tty_port_initialized(port)) { 984ab4382d2SGreg Kroah-Hartman if (((old_flags ^ uport->flags) & UPF_SPD_MASK) || 985ab4382d2SGreg Kroah-Hartman old_custom_divisor != uport->custom_divisor) { 986ab4382d2SGreg Kroah-Hartman /* 987ab4382d2SGreg Kroah-Hartman * If they're setting up a custom divisor or speed, 988dc2f7271SJohan Hovold * instead of clearing it, then bitch about it. 989ab4382d2SGreg Kroah-Hartman */ 990ab4382d2SGreg Kroah-Hartman if (uport->flags & UPF_SPD_MASK) { 991dc2f7271SJohan Hovold dev_notice_ratelimited(uport->dev, 9922f2dafe7SSudip Mukherjee "%s sets custom speed on %s. This is deprecated.\n", 9932f2dafe7SSudip Mukherjee current->comm, 994429b4749SRasmus Villemoes tty_name(port->tty)); 995ab4382d2SGreg Kroah-Hartman } 996ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 997ab4382d2SGreg Kroah-Hartman } 998b3b57646SRob Herring } else { 999ab4382d2SGreg Kroah-Hartman retval = uart_startup(tty, state, 1); 100044117a1dSSebastian Andrzej Siewior if (retval == 0) 100144117a1dSSebastian Andrzej Siewior tty_port_set_initialized(port, true); 1002b3b57646SRob Herring if (retval > 0) 1003b3b57646SRob Herring retval = 0; 1004b3b57646SRob Herring } 1005ab4382d2SGreg Kroah-Hartman exit: 10067ba2e769SAlan Cox return retval; 10077ba2e769SAlan Cox } 10087ba2e769SAlan Cox 10095099d234SAl Viro static int uart_set_info_user(struct tty_struct *tty, struct serial_struct *ss) 10107ba2e769SAlan Cox { 10115099d234SAl Viro struct uart_state *state = tty->driver_data; 10127ba2e769SAlan Cox struct tty_port *port = &state->port; 10137ba2e769SAlan Cox int retval; 10147ba2e769SAlan Cox 10155099d234SAl Viro down_write(&tty->termios_rwsem); 10167ba2e769SAlan Cox /* 10177ba2e769SAlan Cox * This semaphore protects port->count. It is also 10187ba2e769SAlan Cox * very useful to prevent opens. Also, take the 10197ba2e769SAlan Cox * port configuration semaphore to make sure that a 10207ba2e769SAlan Cox * module insertion/removal doesn't change anything 10217ba2e769SAlan Cox * under us. 10227ba2e769SAlan Cox */ 10237ba2e769SAlan Cox mutex_lock(&port->mutex); 10245099d234SAl Viro retval = uart_set_info(tty, port, state, ss); 1025ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 10265099d234SAl Viro up_write(&tty->termios_rwsem); 1027ab4382d2SGreg Kroah-Hartman return retval; 1028ab4382d2SGreg Kroah-Hartman } 1029ab4382d2SGreg Kroah-Hartman 1030ab4382d2SGreg Kroah-Hartman /** 1031ab4382d2SGreg Kroah-Hartman * uart_get_lsr_info - get line status register info 1032ab4382d2SGreg Kroah-Hartman * @tty: tty associated with the UART 1033ab4382d2SGreg Kroah-Hartman * @state: UART being queried 1034ab4382d2SGreg Kroah-Hartman * @value: returned modem value 1035ab4382d2SGreg Kroah-Hartman */ 1036ab4382d2SGreg Kroah-Hartman static int uart_get_lsr_info(struct tty_struct *tty, 1037ab4382d2SGreg Kroah-Hartman struct uart_state *state, unsigned int __user *value) 1038ab4382d2SGreg Kroah-Hartman { 10394047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 1040ab4382d2SGreg Kroah-Hartman unsigned int result; 1041ab4382d2SGreg Kroah-Hartman 1042ab4382d2SGreg Kroah-Hartman result = uport->ops->tx_empty(uport); 1043ab4382d2SGreg Kroah-Hartman 1044ab4382d2SGreg Kroah-Hartman /* 1045ab4382d2SGreg Kroah-Hartman * If we're about to load something into the transmit 1046ab4382d2SGreg Kroah-Hartman * register, we'll pretend the transmitter isn't empty to 1047ab4382d2SGreg Kroah-Hartman * avoid a race condition (depending on when the transmit 1048ab4382d2SGreg Kroah-Hartman * interrupt happens). 1049ab4382d2SGreg Kroah-Hartman */ 1050ab4382d2SGreg Kroah-Hartman if (uport->x_char || 1051ab4382d2SGreg Kroah-Hartman ((uart_circ_chars_pending(&state->xmit) > 0) && 1052d01f4d18SPeter Hurley !uart_tx_stopped(uport))) 1053ab4382d2SGreg Kroah-Hartman result &= ~TIOCSER_TEMT; 1054ab4382d2SGreg Kroah-Hartman 1055ab4382d2SGreg Kroah-Hartman return put_user(result, value); 1056ab4382d2SGreg Kroah-Hartman } 1057ab4382d2SGreg Kroah-Hartman 105860b33c13SAlan Cox static int uart_tiocmget(struct tty_struct *tty) 1059ab4382d2SGreg Kroah-Hartman { 1060ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1061ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 10624047b371SPeter Hurley struct uart_port *uport; 1063ab4382d2SGreg Kroah-Hartman int result = -EIO; 1064ab4382d2SGreg Kroah-Hartman 1065ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 10664047b371SPeter Hurley uport = uart_port_check(state); 10674047b371SPeter Hurley if (!uport) 10684047b371SPeter Hurley goto out; 10694047b371SPeter Hurley 107018900ca6SPeter Hurley if (!tty_io_error(tty)) { 1071ab4382d2SGreg Kroah-Hartman result = uport->mctrl; 1072ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1073ab4382d2SGreg Kroah-Hartman result |= uport->ops->get_mctrl(uport); 1074ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1075ab4382d2SGreg Kroah-Hartman } 10764047b371SPeter Hurley out: 1077ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1078ab4382d2SGreg Kroah-Hartman return result; 1079ab4382d2SGreg Kroah-Hartman } 1080ab4382d2SGreg Kroah-Hartman 1081ab4382d2SGreg Kroah-Hartman static int 108220b9d177SAlan Cox uart_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear) 1083ab4382d2SGreg Kroah-Hartman { 1084ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1085ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 10864047b371SPeter Hurley struct uart_port *uport; 1087ab4382d2SGreg Kroah-Hartman int ret = -EIO; 1088ab4382d2SGreg Kroah-Hartman 1089ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 10904047b371SPeter Hurley uport = uart_port_check(state); 10914047b371SPeter Hurley if (!uport) 10924047b371SPeter Hurley goto out; 10934047b371SPeter Hurley 109418900ca6SPeter Hurley if (!tty_io_error(tty)) { 1095ab4382d2SGreg Kroah-Hartman uart_update_mctrl(uport, set, clear); 1096ab4382d2SGreg Kroah-Hartman ret = 0; 1097ab4382d2SGreg Kroah-Hartman } 10984047b371SPeter Hurley out: 1099ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1100ab4382d2SGreg Kroah-Hartman return ret; 1101ab4382d2SGreg Kroah-Hartman } 1102ab4382d2SGreg Kroah-Hartman 1103ab4382d2SGreg Kroah-Hartman static int uart_break_ctl(struct tty_struct *tty, int break_state) 1104ab4382d2SGreg Kroah-Hartman { 1105ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1106ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 11074047b371SPeter Hurley struct uart_port *uport; 11084047b371SPeter Hurley int ret = -EIO; 1109ab4382d2SGreg Kroah-Hartman 1110ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 11114047b371SPeter Hurley uport = uart_port_check(state); 11124047b371SPeter Hurley if (!uport) 11134047b371SPeter Hurley goto out; 1114ab4382d2SGreg Kroah-Hartman 1115ab4382d2SGreg Kroah-Hartman if (uport->type != PORT_UNKNOWN) 1116ab4382d2SGreg Kroah-Hartman uport->ops->break_ctl(uport, break_state); 11174047b371SPeter Hurley ret = 0; 11184047b371SPeter Hurley out: 1119ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 11204047b371SPeter Hurley return ret; 1121ab4382d2SGreg Kroah-Hartman } 1122ab4382d2SGreg Kroah-Hartman 1123ab4382d2SGreg Kroah-Hartman static int uart_do_autoconfig(struct tty_struct *tty,struct uart_state *state) 1124ab4382d2SGreg Kroah-Hartman { 1125ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 11264047b371SPeter Hurley struct uart_port *uport; 1127ab4382d2SGreg Kroah-Hartman int flags, ret; 1128ab4382d2SGreg Kroah-Hartman 1129ab4382d2SGreg Kroah-Hartman if (!capable(CAP_SYS_ADMIN)) 1130ab4382d2SGreg Kroah-Hartman return -EPERM; 1131ab4382d2SGreg Kroah-Hartman 1132ab4382d2SGreg Kroah-Hartman /* 1133ab4382d2SGreg Kroah-Hartman * Take the per-port semaphore. This prevents count from 1134ab4382d2SGreg Kroah-Hartman * changing, and hence any extra opens of the port while 1135ab4382d2SGreg Kroah-Hartman * we're auto-configuring. 1136ab4382d2SGreg Kroah-Hartman */ 1137ab4382d2SGreg Kroah-Hartman if (mutex_lock_interruptible(&port->mutex)) 1138ab4382d2SGreg Kroah-Hartman return -ERESTARTSYS; 1139ab4382d2SGreg Kroah-Hartman 11404047b371SPeter Hurley uport = uart_port_check(state); 11414047b371SPeter Hurley if (!uport) { 11424047b371SPeter Hurley ret = -EIO; 11434047b371SPeter Hurley goto out; 11444047b371SPeter Hurley } 11454047b371SPeter Hurley 1146ab4382d2SGreg Kroah-Hartman ret = -EBUSY; 1147ab4382d2SGreg Kroah-Hartman if (tty_port_users(port) == 1) { 1148ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 1149ab4382d2SGreg Kroah-Hartman 1150ab4382d2SGreg Kroah-Hartman /* 1151ab4382d2SGreg Kroah-Hartman * If we already have a port type configured, 1152ab4382d2SGreg Kroah-Hartman * we must release its resources. 1153ab4382d2SGreg Kroah-Hartman */ 1154a7cfaf16SFabio Estevam if (uport->type != PORT_UNKNOWN && uport->ops->release_port) 1155ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 1156ab4382d2SGreg Kroah-Hartman 1157ab4382d2SGreg Kroah-Hartman flags = UART_CONFIG_TYPE; 1158ab4382d2SGreg Kroah-Hartman if (uport->flags & UPF_AUTO_IRQ) 1159ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_IRQ; 1160ab4382d2SGreg Kroah-Hartman 1161ab4382d2SGreg Kroah-Hartman /* 1162ab4382d2SGreg Kroah-Hartman * This will claim the ports resources if 1163ab4382d2SGreg Kroah-Hartman * a port is found. 1164ab4382d2SGreg Kroah-Hartman */ 1165ab4382d2SGreg Kroah-Hartman uport->ops->config_port(uport, flags); 1166ab4382d2SGreg Kroah-Hartman 1167ab4382d2SGreg Kroah-Hartman ret = uart_startup(tty, state, 1); 116871456906SSebastian Andrzej Siewior if (ret == 0) 116971456906SSebastian Andrzej Siewior tty_port_set_initialized(port, true); 1170b3b57646SRob Herring if (ret > 0) 1171b3b57646SRob Herring ret = 0; 1172ab4382d2SGreg Kroah-Hartman } 11734047b371SPeter Hurley out: 1174ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1175ab4382d2SGreg Kroah-Hartman return ret; 1176ab4382d2SGreg Kroah-Hartman } 1177ab4382d2SGreg Kroah-Hartman 11781fdc3106SAlexander Shiyan static void uart_enable_ms(struct uart_port *uport) 11791fdc3106SAlexander Shiyan { 11801fdc3106SAlexander Shiyan /* 11811fdc3106SAlexander Shiyan * Force modem status interrupts on 11821fdc3106SAlexander Shiyan */ 11831fdc3106SAlexander Shiyan if (uport->ops->enable_ms) 11841fdc3106SAlexander Shiyan uport->ops->enable_ms(uport); 11851fdc3106SAlexander Shiyan } 11861fdc3106SAlexander Shiyan 1187ab4382d2SGreg Kroah-Hartman /* 1188ab4382d2SGreg Kroah-Hartman * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change 1189ab4382d2SGreg Kroah-Hartman * - mask passed in arg for lines of interest 1190ab4382d2SGreg Kroah-Hartman * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) 1191ab4382d2SGreg Kroah-Hartman * Caller should use TIOCGICOUNT to see which one it was 1192ab4382d2SGreg Kroah-Hartman * 1193ab4382d2SGreg Kroah-Hartman * FIXME: This wants extracting into a common all driver implementation 1194ab4382d2SGreg Kroah-Hartman * of TIOCMWAIT using tty_port. 1195ab4382d2SGreg Kroah-Hartman */ 11969ed19428SPeter Hurley static int uart_wait_modem_status(struct uart_state *state, unsigned long arg) 1197ab4382d2SGreg Kroah-Hartman { 11989ed19428SPeter Hurley struct uart_port *uport; 1199ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1200ab4382d2SGreg Kroah-Hartman DECLARE_WAITQUEUE(wait, current); 1201ab4382d2SGreg Kroah-Hartman struct uart_icount cprev, cnow; 1202ab4382d2SGreg Kroah-Hartman int ret; 1203ab4382d2SGreg Kroah-Hartman 1204ab4382d2SGreg Kroah-Hartman /* 1205ab4382d2SGreg Kroah-Hartman * note the counters on entry 1206ab4382d2SGreg Kroah-Hartman */ 12079ed19428SPeter Hurley uport = uart_port_ref(state); 12089ed19428SPeter Hurley if (!uport) 12099ed19428SPeter Hurley return -EIO; 1210ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1211ab4382d2SGreg Kroah-Hartman memcpy(&cprev, &uport->icount, sizeof(struct uart_icount)); 12121fdc3106SAlexander Shiyan uart_enable_ms(uport); 1213ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1214ab4382d2SGreg Kroah-Hartman 1215ab4382d2SGreg Kroah-Hartman add_wait_queue(&port->delta_msr_wait, &wait); 1216ab4382d2SGreg Kroah-Hartman for (;;) { 1217ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1218ab4382d2SGreg Kroah-Hartman memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); 1219ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1220ab4382d2SGreg Kroah-Hartman 1221ab4382d2SGreg Kroah-Hartman set_current_state(TASK_INTERRUPTIBLE); 1222ab4382d2SGreg Kroah-Hartman 1223ab4382d2SGreg Kroah-Hartman if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || 1224ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || 1225ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || 1226ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) { 1227ab4382d2SGreg Kroah-Hartman ret = 0; 1228ab4382d2SGreg Kroah-Hartman break; 1229ab4382d2SGreg Kroah-Hartman } 1230ab4382d2SGreg Kroah-Hartman 1231ab4382d2SGreg Kroah-Hartman schedule(); 1232ab4382d2SGreg Kroah-Hartman 1233ab4382d2SGreg Kroah-Hartman /* see if a signal did it */ 1234ab4382d2SGreg Kroah-Hartman if (signal_pending(current)) { 1235ab4382d2SGreg Kroah-Hartman ret = -ERESTARTSYS; 1236ab4382d2SGreg Kroah-Hartman break; 1237ab4382d2SGreg Kroah-Hartman } 1238ab4382d2SGreg Kroah-Hartman 1239ab4382d2SGreg Kroah-Hartman cprev = cnow; 1240ab4382d2SGreg Kroah-Hartman } 124197f9f707SFabian Frederick __set_current_state(TASK_RUNNING); 1242ab4382d2SGreg Kroah-Hartman remove_wait_queue(&port->delta_msr_wait, &wait); 12439ed19428SPeter Hurley uart_port_deref(uport); 1244ab4382d2SGreg Kroah-Hartman 1245ab4382d2SGreg Kroah-Hartman return ret; 1246ab4382d2SGreg Kroah-Hartman } 1247ab4382d2SGreg Kroah-Hartman 1248ab4382d2SGreg Kroah-Hartman /* 1249ab4382d2SGreg Kroah-Hartman * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) 1250ab4382d2SGreg Kroah-Hartman * Return: write counters to the user passed counter struct 1251ab4382d2SGreg Kroah-Hartman * NB: both 1->0 and 0->1 transitions are counted except for 1252ab4382d2SGreg Kroah-Hartman * RI where only 0->1 is counted. 1253ab4382d2SGreg Kroah-Hartman */ 1254ab4382d2SGreg Kroah-Hartman static int uart_get_icount(struct tty_struct *tty, 1255ab4382d2SGreg Kroah-Hartman struct serial_icounter_struct *icount) 1256ab4382d2SGreg Kroah-Hartman { 1257ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1258ab4382d2SGreg Kroah-Hartman struct uart_icount cnow; 12599ed19428SPeter Hurley struct uart_port *uport; 1260ab4382d2SGreg Kroah-Hartman 12619ed19428SPeter Hurley uport = uart_port_ref(state); 12629ed19428SPeter Hurley if (!uport) 12639ed19428SPeter Hurley return -EIO; 1264ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1265ab4382d2SGreg Kroah-Hartman memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); 1266ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 12679ed19428SPeter Hurley uart_port_deref(uport); 1268ab4382d2SGreg Kroah-Hartman 1269ab4382d2SGreg Kroah-Hartman icount->cts = cnow.cts; 1270ab4382d2SGreg Kroah-Hartman icount->dsr = cnow.dsr; 1271ab4382d2SGreg Kroah-Hartman icount->rng = cnow.rng; 1272ab4382d2SGreg Kroah-Hartman icount->dcd = cnow.dcd; 1273ab4382d2SGreg Kroah-Hartman icount->rx = cnow.rx; 1274ab4382d2SGreg Kroah-Hartman icount->tx = cnow.tx; 1275ab4382d2SGreg Kroah-Hartman icount->frame = cnow.frame; 1276ab4382d2SGreg Kroah-Hartman icount->overrun = cnow.overrun; 1277ab4382d2SGreg Kroah-Hartman icount->parity = cnow.parity; 1278ab4382d2SGreg Kroah-Hartman icount->brk = cnow.brk; 1279ab4382d2SGreg Kroah-Hartman icount->buf_overrun = cnow.buf_overrun; 1280ab4382d2SGreg Kroah-Hartman 1281ab4382d2SGreg Kroah-Hartman return 0; 1282ab4382d2SGreg Kroah-Hartman } 1283ab4382d2SGreg Kroah-Hartman 1284a5f276f1SRicardo Ribalda Delgado static int uart_get_rs485_config(struct uart_port *port, 1285a5f276f1SRicardo Ribalda Delgado struct serial_rs485 __user *rs485) 1286a5f276f1SRicardo Ribalda Delgado { 1287bd737f87SRicardo Ribalda Delgado unsigned long flags; 1288bd737f87SRicardo Ribalda Delgado struct serial_rs485 aux; 1289bd737f87SRicardo Ribalda Delgado 1290bd737f87SRicardo Ribalda Delgado spin_lock_irqsave(&port->lock, flags); 1291bd737f87SRicardo Ribalda Delgado aux = port->rs485; 1292bd737f87SRicardo Ribalda Delgado spin_unlock_irqrestore(&port->lock, flags); 1293bd737f87SRicardo Ribalda Delgado 1294bd737f87SRicardo Ribalda Delgado if (copy_to_user(rs485, &aux, sizeof(aux))) 1295a5f276f1SRicardo Ribalda Delgado return -EFAULT; 1296bd737f87SRicardo Ribalda Delgado 1297a5f276f1SRicardo Ribalda Delgado return 0; 1298a5f276f1SRicardo Ribalda Delgado } 1299a5f276f1SRicardo Ribalda Delgado 1300a5f276f1SRicardo Ribalda Delgado static int uart_set_rs485_config(struct uart_port *port, 1301a5f276f1SRicardo Ribalda Delgado struct serial_rs485 __user *rs485_user) 1302a5f276f1SRicardo Ribalda Delgado { 1303a5f276f1SRicardo Ribalda Delgado struct serial_rs485 rs485; 1304a5f276f1SRicardo Ribalda Delgado int ret; 1305bd737f87SRicardo Ribalda Delgado unsigned long flags; 1306a5f276f1SRicardo Ribalda Delgado 1307a5f276f1SRicardo Ribalda Delgado if (!port->rs485_config) 1308a5f276f1SRicardo Ribalda Delgado return -ENOIOCTLCMD; 1309a5f276f1SRicardo Ribalda Delgado 1310a5f276f1SRicardo Ribalda Delgado if (copy_from_user(&rs485, rs485_user, sizeof(*rs485_user))) 1311a5f276f1SRicardo Ribalda Delgado return -EFAULT; 1312a5f276f1SRicardo Ribalda Delgado 1313bd737f87SRicardo Ribalda Delgado spin_lock_irqsave(&port->lock, flags); 1314a5f276f1SRicardo Ribalda Delgado ret = port->rs485_config(port, &rs485); 1315bd737f87SRicardo Ribalda Delgado spin_unlock_irqrestore(&port->lock, flags); 1316a5f276f1SRicardo Ribalda Delgado if (ret) 1317a5f276f1SRicardo Ribalda Delgado return ret; 1318a5f276f1SRicardo Ribalda Delgado 1319a5f276f1SRicardo Ribalda Delgado if (copy_to_user(rs485_user, &port->rs485, sizeof(port->rs485))) 1320a5f276f1SRicardo Ribalda Delgado return -EFAULT; 1321a5f276f1SRicardo Ribalda Delgado 1322a5f276f1SRicardo Ribalda Delgado return 0; 1323a5f276f1SRicardo Ribalda Delgado } 1324a5f276f1SRicardo Ribalda Delgado 1325ad8c0eaaSNicolas Ferre static int uart_get_iso7816_config(struct uart_port *port, 1326ad8c0eaaSNicolas Ferre struct serial_iso7816 __user *iso7816) 1327ad8c0eaaSNicolas Ferre { 1328ad8c0eaaSNicolas Ferre unsigned long flags; 1329ad8c0eaaSNicolas Ferre struct serial_iso7816 aux; 1330ad8c0eaaSNicolas Ferre 1331ad8c0eaaSNicolas Ferre if (!port->iso7816_config) 1332ad8c0eaaSNicolas Ferre return -ENOIOCTLCMD; 1333ad8c0eaaSNicolas Ferre 1334ad8c0eaaSNicolas Ferre spin_lock_irqsave(&port->lock, flags); 1335ad8c0eaaSNicolas Ferre aux = port->iso7816; 1336ad8c0eaaSNicolas Ferre spin_unlock_irqrestore(&port->lock, flags); 1337ad8c0eaaSNicolas Ferre 1338ad8c0eaaSNicolas Ferre if (copy_to_user(iso7816, &aux, sizeof(aux))) 1339ad8c0eaaSNicolas Ferre return -EFAULT; 1340ad8c0eaaSNicolas Ferre 1341ad8c0eaaSNicolas Ferre return 0; 1342ad8c0eaaSNicolas Ferre } 1343ad8c0eaaSNicolas Ferre 1344ad8c0eaaSNicolas Ferre static int uart_set_iso7816_config(struct uart_port *port, 1345ad8c0eaaSNicolas Ferre struct serial_iso7816 __user *iso7816_user) 1346ad8c0eaaSNicolas Ferre { 1347ad8c0eaaSNicolas Ferre struct serial_iso7816 iso7816; 1348ad8c0eaaSNicolas Ferre int i, ret; 1349ad8c0eaaSNicolas Ferre unsigned long flags; 1350ad8c0eaaSNicolas Ferre 1351ad8c0eaaSNicolas Ferre if (!port->iso7816_config) 1352ad8c0eaaSNicolas Ferre return -ENOIOCTLCMD; 1353ad8c0eaaSNicolas Ferre 1354ad8c0eaaSNicolas Ferre if (copy_from_user(&iso7816, iso7816_user, sizeof(*iso7816_user))) 1355ad8c0eaaSNicolas Ferre return -EFAULT; 1356ad8c0eaaSNicolas Ferre 1357ad8c0eaaSNicolas Ferre /* 1358ad8c0eaaSNicolas Ferre * There are 5 words reserved for future use. Check that userspace 1359ad8c0eaaSNicolas Ferre * doesn't put stuff in there to prevent breakages in the future. 1360ad8c0eaaSNicolas Ferre */ 1361ad8c0eaaSNicolas Ferre for (i = 0; i < 5; i++) 1362ad8c0eaaSNicolas Ferre if (iso7816.reserved[i]) 1363ad8c0eaaSNicolas Ferre return -EINVAL; 1364ad8c0eaaSNicolas Ferre 1365ad8c0eaaSNicolas Ferre spin_lock_irqsave(&port->lock, flags); 1366ad8c0eaaSNicolas Ferre ret = port->iso7816_config(port, &iso7816); 1367ad8c0eaaSNicolas Ferre spin_unlock_irqrestore(&port->lock, flags); 1368ad8c0eaaSNicolas Ferre if (ret) 1369ad8c0eaaSNicolas Ferre return ret; 1370ad8c0eaaSNicolas Ferre 1371ad8c0eaaSNicolas Ferre if (copy_to_user(iso7816_user, &port->iso7816, sizeof(port->iso7816))) 1372ad8c0eaaSNicolas Ferre return -EFAULT; 1373ad8c0eaaSNicolas Ferre 1374ad8c0eaaSNicolas Ferre return 0; 1375ad8c0eaaSNicolas Ferre } 1376ad8c0eaaSNicolas Ferre 1377ab4382d2SGreg Kroah-Hartman /* 1378ab4382d2SGreg Kroah-Hartman * Called via sys_ioctl. We can use spin_lock_irq() here. 1379ab4382d2SGreg Kroah-Hartman */ 1380ab4382d2SGreg Kroah-Hartman static int 13814047b371SPeter Hurley uart_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg) 1382ab4382d2SGreg Kroah-Hartman { 1383ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1384ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 13854047b371SPeter Hurley struct uart_port *uport; 1386ab4382d2SGreg Kroah-Hartman void __user *uarg = (void __user *)arg; 1387ab4382d2SGreg Kroah-Hartman int ret = -ENOIOCTLCMD; 1388ab4382d2SGreg Kroah-Hartman 1389ab4382d2SGreg Kroah-Hartman 1390ab4382d2SGreg Kroah-Hartman /* 1391ab4382d2SGreg Kroah-Hartman * These ioctls don't rely on the hardware to be present. 1392ab4382d2SGreg Kroah-Hartman */ 1393ab4382d2SGreg Kroah-Hartman switch (cmd) { 1394ab4382d2SGreg Kroah-Hartman case TIOCSERCONFIG: 13957c8ab967SPeter Hurley down_write(&tty->termios_rwsem); 1396ab4382d2SGreg Kroah-Hartman ret = uart_do_autoconfig(tty, state); 13977c8ab967SPeter Hurley up_write(&tty->termios_rwsem); 1398ab4382d2SGreg Kroah-Hartman break; 1399ab4382d2SGreg Kroah-Hartman } 1400ab4382d2SGreg Kroah-Hartman 1401ab4382d2SGreg Kroah-Hartman if (ret != -ENOIOCTLCMD) 1402ab4382d2SGreg Kroah-Hartman goto out; 1403ab4382d2SGreg Kroah-Hartman 140418900ca6SPeter Hurley if (tty_io_error(tty)) { 1405ab4382d2SGreg Kroah-Hartman ret = -EIO; 1406ab4382d2SGreg Kroah-Hartman goto out; 1407ab4382d2SGreg Kroah-Hartman } 1408ab4382d2SGreg Kroah-Hartman 1409ab4382d2SGreg Kroah-Hartman /* 1410ab4382d2SGreg Kroah-Hartman * The following should only be used when hardware is present. 1411ab4382d2SGreg Kroah-Hartman */ 1412ab4382d2SGreg Kroah-Hartman switch (cmd) { 1413ab4382d2SGreg Kroah-Hartman case TIOCMIWAIT: 1414ab4382d2SGreg Kroah-Hartman ret = uart_wait_modem_status(state, arg); 1415ab4382d2SGreg Kroah-Hartman break; 1416ab4382d2SGreg Kroah-Hartman } 1417ab4382d2SGreg Kroah-Hartman 1418ab4382d2SGreg Kroah-Hartman if (ret != -ENOIOCTLCMD) 1419ab4382d2SGreg Kroah-Hartman goto out; 1420ab4382d2SGreg Kroah-Hartman 1421ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 14224047b371SPeter Hurley uport = uart_port_check(state); 1423ab4382d2SGreg Kroah-Hartman 14244047b371SPeter Hurley if (!uport || tty_io_error(tty)) { 1425ab4382d2SGreg Kroah-Hartman ret = -EIO; 1426ab4382d2SGreg Kroah-Hartman goto out_up; 1427ab4382d2SGreg Kroah-Hartman } 1428ab4382d2SGreg Kroah-Hartman 1429ab4382d2SGreg Kroah-Hartman /* 1430ab4382d2SGreg Kroah-Hartman * All these rely on hardware being present and need to be 1431ab4382d2SGreg Kroah-Hartman * protected against the tty being hung up. 1432ab4382d2SGreg Kroah-Hartman */ 1433a9c20a9cSRicardo Ribalda Delgado 1434ab4382d2SGreg Kroah-Hartman switch (cmd) { 1435a9c20a9cSRicardo Ribalda Delgado case TIOCSERGETLSR: /* Get line status register */ 1436a9c20a9cSRicardo Ribalda Delgado ret = uart_get_lsr_info(tty, state, uarg); 1437a9c20a9cSRicardo Ribalda Delgado break; 1438a9c20a9cSRicardo Ribalda Delgado 1439a5f276f1SRicardo Ribalda Delgado case TIOCGRS485: 14404047b371SPeter Hurley ret = uart_get_rs485_config(uport, uarg); 1441a5f276f1SRicardo Ribalda Delgado break; 1442a5f276f1SRicardo Ribalda Delgado 1443a5f276f1SRicardo Ribalda Delgado case TIOCSRS485: 14444047b371SPeter Hurley ret = uart_set_rs485_config(uport, uarg); 1445a5f276f1SRicardo Ribalda Delgado break; 1446ad8c0eaaSNicolas Ferre 1447ad8c0eaaSNicolas Ferre case TIOCSISO7816: 1448ad8c0eaaSNicolas Ferre ret = uart_set_iso7816_config(state->uart_port, uarg); 1449ad8c0eaaSNicolas Ferre break; 1450ad8c0eaaSNicolas Ferre 1451ad8c0eaaSNicolas Ferre case TIOCGISO7816: 1452ad8c0eaaSNicolas Ferre ret = uart_get_iso7816_config(state->uart_port, uarg); 1453ad8c0eaaSNicolas Ferre break; 14544047b371SPeter Hurley default: 1455ab4382d2SGreg Kroah-Hartman if (uport->ops->ioctl) 1456ab4382d2SGreg Kroah-Hartman ret = uport->ops->ioctl(uport, cmd, arg); 1457ab4382d2SGreg Kroah-Hartman break; 1458ab4382d2SGreg Kroah-Hartman } 1459ab4382d2SGreg Kroah-Hartman out_up: 1460ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1461ab4382d2SGreg Kroah-Hartman out: 1462ab4382d2SGreg Kroah-Hartman return ret; 1463ab4382d2SGreg Kroah-Hartman } 1464ab4382d2SGreg Kroah-Hartman 1465ab4382d2SGreg Kroah-Hartman static void uart_set_ldisc(struct tty_struct *tty) 1466ab4382d2SGreg Kroah-Hartman { 1467ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 14684047b371SPeter Hurley struct uart_port *uport; 1469ab4382d2SGreg Kroah-Hartman 1470db1b9dfcSPeter Hurley mutex_lock(&state->port.mutex); 14714047b371SPeter Hurley uport = uart_port_check(state); 14724047b371SPeter Hurley if (uport && uport->ops->set_ldisc) 1473732a84a0SPeter Hurley uport->ops->set_ldisc(uport, &tty->termios); 1474db1b9dfcSPeter Hurley mutex_unlock(&state->port.mutex); 1475db1b9dfcSPeter Hurley } 1476ab4382d2SGreg Kroah-Hartman 1477ab4382d2SGreg Kroah-Hartman static void uart_set_termios(struct tty_struct *tty, 1478ab4382d2SGreg Kroah-Hartman struct ktermios *old_termios) 1479ab4382d2SGreg Kroah-Hartman { 1480ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 14814047b371SPeter Hurley struct uart_port *uport; 1482adc8d746SAlan Cox unsigned int cflag = tty->termios.c_cflag; 14832cbacafdSRussell King unsigned int iflag_mask = IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK; 14842cbacafdSRussell King bool sw_changed = false; 1485ab4382d2SGreg Kroah-Hartman 14864047b371SPeter Hurley mutex_lock(&state->port.mutex); 14874047b371SPeter Hurley uport = uart_port_check(state); 14884047b371SPeter Hurley if (!uport) 14894047b371SPeter Hurley goto out; 14904047b371SPeter Hurley 14912cbacafdSRussell King /* 14922cbacafdSRussell King * Drivers doing software flow control also need to know 14932cbacafdSRussell King * about changes to these input settings. 14942cbacafdSRussell King */ 14952cbacafdSRussell King if (uport->flags & UPF_SOFT_FLOW) { 14962cbacafdSRussell King iflag_mask |= IXANY|IXON|IXOFF; 14972cbacafdSRussell King sw_changed = 14982cbacafdSRussell King tty->termios.c_cc[VSTART] != old_termios->c_cc[VSTART] || 14992cbacafdSRussell King tty->termios.c_cc[VSTOP] != old_termios->c_cc[VSTOP]; 15002cbacafdSRussell King } 1501ab4382d2SGreg Kroah-Hartman 1502ab4382d2SGreg Kroah-Hartman /* 1503ab4382d2SGreg Kroah-Hartman * These are the bits that are used to setup various 1504ab4382d2SGreg Kroah-Hartman * flags in the low level driver. We can ignore the Bfoo 1505ab4382d2SGreg Kroah-Hartman * bits in c_cflag; c_[io]speed will always be set 1506ab4382d2SGreg Kroah-Hartman * appropriately by set_termios() in tty_ioctl.c 1507ab4382d2SGreg Kroah-Hartman */ 1508ab4382d2SGreg Kroah-Hartman if ((cflag ^ old_termios->c_cflag) == 0 && 1509adc8d746SAlan Cox tty->termios.c_ospeed == old_termios->c_ospeed && 1510adc8d746SAlan Cox tty->termios.c_ispeed == old_termios->c_ispeed && 15112cbacafdSRussell King ((tty->termios.c_iflag ^ old_termios->c_iflag) & iflag_mask) == 0 && 15122cbacafdSRussell King !sw_changed) { 15134047b371SPeter Hurley goto out; 1514ab4382d2SGreg Kroah-Hartman } 1515ab4382d2SGreg Kroah-Hartman 1516ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, old_termios); 1517c18b55fdSPeter Hurley /* reload cflag from termios; port driver may have overriden flags */ 1518c18b55fdSPeter Hurley cflag = tty->termios.c_cflag; 1519ab4382d2SGreg Kroah-Hartman 1520ab4382d2SGreg Kroah-Hartman /* Handle transition to B0 status */ 1521ab4382d2SGreg Kroah-Hartman if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) 1522dec94e70SRussell King uart_clear_mctrl(uport, TIOCM_RTS | TIOCM_DTR); 1523ab4382d2SGreg Kroah-Hartman /* Handle transition away from B0 status */ 1524ab4382d2SGreg Kroah-Hartman else if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { 1525ab4382d2SGreg Kroah-Hartman unsigned int mask = TIOCM_DTR; 152697ef38b8SPeter Hurley if (!(cflag & CRTSCTS) || !tty_throttled(tty)) 1527ab4382d2SGreg Kroah-Hartman mask |= TIOCM_RTS; 1528dec94e70SRussell King uart_set_mctrl(uport, mask); 1529ab4382d2SGreg Kroah-Hartman } 15304047b371SPeter Hurley out: 15314047b371SPeter Hurley mutex_unlock(&state->port.mutex); 1532ab4382d2SGreg Kroah-Hartman } 1533ab4382d2SGreg Kroah-Hartman 1534ab4382d2SGreg Kroah-Hartman /* 1535ef4f527cSKevin Cernekee * Calls to uart_close() are serialised via the tty_lock in 1536ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:tty_release() 1537ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:do_tty_hangup() 1538ab4382d2SGreg Kroah-Hartman */ 1539ab4382d2SGreg Kroah-Hartman static void uart_close(struct tty_struct *tty, struct file *filp) 1540ab4382d2SGreg Kroah-Hartman { 1541ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1542ab4382d2SGreg Kroah-Hartman 154391b32f54SPeter Hurley if (!state) { 154491b32f54SPeter Hurley struct uart_driver *drv = tty->driver->driver_state; 15459356335fSColin Ian King struct tty_port *port; 154691b32f54SPeter Hurley 154791b32f54SPeter Hurley state = drv->state + tty->index; 154891b32f54SPeter Hurley port = &state->port; 154991b32f54SPeter Hurley spin_lock_irq(&port->lock); 155091b32f54SPeter Hurley --port->count; 155191b32f54SPeter Hurley spin_unlock_irq(&port->lock); 1552ab4382d2SGreg Kroah-Hartman return; 155391b32f54SPeter Hurley } 1554ab4382d2SGreg Kroah-Hartman 155539b3d892SPeter Hurley pr_debug("uart_close(%d) called\n", tty->index); 1556ab4382d2SGreg Kroah-Hartman 1557761ed4a9SRob Herring tty_port_close(tty->port, tty, filp); 1558761ed4a9SRob Herring } 1559ab4382d2SGreg Kroah-Hartman 1560761ed4a9SRob Herring static void uart_tty_port_shutdown(struct tty_port *port) 1561761ed4a9SRob Herring { 1562761ed4a9SRob Herring struct uart_state *state = container_of(port, struct uart_state, port); 1563761ed4a9SRob Herring struct uart_port *uport = uart_port_check(state); 1564af224ca2SPeter Hurley 1565ab4382d2SGreg Kroah-Hartman /* 1566ab4382d2SGreg Kroah-Hartman * At this point, we stop accepting input. To do this, we 1567ab4382d2SGreg Kroah-Hartman * disable the receive line status interrupts. 1568ab4382d2SGreg Kroah-Hartman */ 1569a5a2b130SAndy Shevchenko if (WARN(!uport, "detached port still initialized!\n")) 1570a5a2b130SAndy Shevchenko return; 1571761ed4a9SRob Herring 1572a5a2b130SAndy Shevchenko spin_lock_irq(&uport->lock); 1573ab4382d2SGreg Kroah-Hartman uport->ops->stop_rx(uport); 15746fb98fb3SPeter Hurley spin_unlock_irq(&uport->lock); 1575761ed4a9SRob Herring 1576761ed4a9SRob Herring uart_port_shutdown(port); 1577761ed4a9SRob Herring 1578ab4382d2SGreg Kroah-Hartman /* 1579761ed4a9SRob Herring * It's possible for shutdown to be called after suspend if we get 1580761ed4a9SRob Herring * a DCD drop (hangup) at just the right time. Clear suspended bit so 1581761ed4a9SRob Herring * we don't try to resume a port that has been shutdown. 1582ab4382d2SGreg Kroah-Hartman */ 1583761ed4a9SRob Herring tty_port_set_suspended(port, 0); 1584ab4382d2SGreg Kroah-Hartman 15856f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_OFF); 1586ab4382d2SGreg Kroah-Hartman 1587ab4382d2SGreg Kroah-Hartman } 1588ab4382d2SGreg Kroah-Hartman 15891f33a51dSJiri Slaby static void uart_wait_until_sent(struct tty_struct *tty, int timeout) 1590ab4382d2SGreg Kroah-Hartman { 15911f33a51dSJiri Slaby struct uart_state *state = tty->driver_data; 15929ed19428SPeter Hurley struct uart_port *port; 1593ab4382d2SGreg Kroah-Hartman unsigned long char_time, expire; 1594ab4382d2SGreg Kroah-Hartman 15959ed19428SPeter Hurley port = uart_port_ref(state); 1596ef510beaSAndy Shevchenko if (!port) 1597ef510beaSAndy Shevchenko return; 1598ef510beaSAndy Shevchenko 1599ef510beaSAndy Shevchenko if (port->type == PORT_UNKNOWN || port->fifosize == 0) { 16009ed19428SPeter Hurley uart_port_deref(port); 1601ab4382d2SGreg Kroah-Hartman return; 16029ed19428SPeter Hurley } 1603ab4382d2SGreg Kroah-Hartman 1604ab4382d2SGreg Kroah-Hartman /* 1605ab4382d2SGreg Kroah-Hartman * Set the check interval to be 1/5 of the estimated time to 1606ab4382d2SGreg Kroah-Hartman * send a single character, and make it at least 1. The check 1607ab4382d2SGreg Kroah-Hartman * interval should also be less than the timeout. 1608ab4382d2SGreg Kroah-Hartman * 1609ab4382d2SGreg Kroah-Hartman * Note: we have to use pretty tight timings here to satisfy 1610ab4382d2SGreg Kroah-Hartman * the NIST-PCTS. 1611ab4382d2SGreg Kroah-Hartman */ 1612ab4382d2SGreg Kroah-Hartman char_time = (port->timeout - HZ/50) / port->fifosize; 1613ab4382d2SGreg Kroah-Hartman char_time = char_time / 5; 1614ab4382d2SGreg Kroah-Hartman if (char_time == 0) 1615ab4382d2SGreg Kroah-Hartman char_time = 1; 1616ab4382d2SGreg Kroah-Hartman if (timeout && timeout < char_time) 1617ab4382d2SGreg Kroah-Hartman char_time = timeout; 1618ab4382d2SGreg Kroah-Hartman 1619ab4382d2SGreg Kroah-Hartman /* 1620ab4382d2SGreg Kroah-Hartman * If the transmitter hasn't cleared in twice the approximate 1621ab4382d2SGreg Kroah-Hartman * amount of time to send the entire FIFO, it probably won't 1622ab4382d2SGreg Kroah-Hartman * ever clear. This assumes the UART isn't doing flow 1623ab4382d2SGreg Kroah-Hartman * control, which is currently the case. Hence, if it ever 1624ab4382d2SGreg Kroah-Hartman * takes longer than port->timeout, this is probably due to a 1625ab4382d2SGreg Kroah-Hartman * UART bug of some kind. So, we clamp the timeout parameter at 1626ab4382d2SGreg Kroah-Hartman * 2*port->timeout. 1627ab4382d2SGreg Kroah-Hartman */ 1628ab4382d2SGreg Kroah-Hartman if (timeout == 0 || timeout > 2 * port->timeout) 1629ab4382d2SGreg Kroah-Hartman timeout = 2 * port->timeout; 1630ab4382d2SGreg Kroah-Hartman 1631ab4382d2SGreg Kroah-Hartman expire = jiffies + timeout; 1632ab4382d2SGreg Kroah-Hartman 1633ab4382d2SGreg Kroah-Hartman pr_debug("uart_wait_until_sent(%d), jiffies=%lu, expire=%lu...\n", 1634ab4382d2SGreg Kroah-Hartman port->line, jiffies, expire); 1635ab4382d2SGreg Kroah-Hartman 1636ab4382d2SGreg Kroah-Hartman /* 1637ab4382d2SGreg Kroah-Hartman * Check whether the transmitter is empty every 'char_time'. 1638ab4382d2SGreg Kroah-Hartman * 'timeout' / 'expire' give us the maximum amount of time 1639ab4382d2SGreg Kroah-Hartman * we wait. 1640ab4382d2SGreg Kroah-Hartman */ 1641ab4382d2SGreg Kroah-Hartman while (!port->ops->tx_empty(port)) { 1642ab4382d2SGreg Kroah-Hartman msleep_interruptible(jiffies_to_msecs(char_time)); 1643ab4382d2SGreg Kroah-Hartman if (signal_pending(current)) 1644ab4382d2SGreg Kroah-Hartman break; 1645ab4382d2SGreg Kroah-Hartman if (time_after(jiffies, expire)) 1646ab4382d2SGreg Kroah-Hartman break; 1647ab4382d2SGreg Kroah-Hartman } 16489ed19428SPeter Hurley uart_port_deref(port); 1649ab4382d2SGreg Kroah-Hartman } 1650ab4382d2SGreg Kroah-Hartman 1651ab4382d2SGreg Kroah-Hartman /* 1652ef4f527cSKevin Cernekee * Calls to uart_hangup() are serialised by the tty_lock in 1653ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:do_tty_hangup() 1654ef4f527cSKevin Cernekee * This runs from a workqueue and can sleep for a _short_ time only. 1655ab4382d2SGreg Kroah-Hartman */ 1656ab4382d2SGreg Kroah-Hartman static void uart_hangup(struct tty_struct *tty) 1657ab4382d2SGreg Kroah-Hartman { 1658ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1659ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1660af224ca2SPeter Hurley struct uart_port *uport; 1661ab4382d2SGreg Kroah-Hartman unsigned long flags; 1662ab4382d2SGreg Kroah-Hartman 166339b3d892SPeter Hurley pr_debug("uart_hangup(%d)\n", tty->index); 1664ab4382d2SGreg Kroah-Hartman 1665ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1666af224ca2SPeter Hurley uport = uart_port_check(state); 1667af224ca2SPeter Hurley WARN(!uport, "hangup of detached port!\n"); 1668af224ca2SPeter Hurley 1669807c8d81SPeter Hurley if (tty_port_active(port)) { 1670ab4382d2SGreg Kroah-Hartman uart_flush_buffer(tty); 1671ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 1672ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 1673ab4382d2SGreg Kroah-Hartman port->count = 0; 1674ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 1675807c8d81SPeter Hurley tty_port_set_active(port, 0); 1676ab4382d2SGreg Kroah-Hartman tty_port_tty_set(port, NULL); 1677af224ca2SPeter Hurley if (uport && !uart_console(uport)) 1678bf903c0cSGeert Uytterhoeven uart_change_pm(state, UART_PM_STATE_OFF); 1679ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->open_wait); 1680ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->delta_msr_wait); 1681ab4382d2SGreg Kroah-Hartman } 1682ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1683ab4382d2SGreg Kroah-Hartman } 1684ab4382d2SGreg Kroah-Hartman 1685af224ca2SPeter Hurley /* uport == NULL if uart_port has already been removed */ 16860b1db830SJiri Slaby static void uart_port_shutdown(struct tty_port *port) 16870b1db830SJiri Slaby { 1688b922e19dSJiri Slaby struct uart_state *state = container_of(port, struct uart_state, port); 16894047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 1690b922e19dSJiri Slaby 1691b922e19dSJiri Slaby /* 1692b922e19dSJiri Slaby * clear delta_msr_wait queue to avoid mem leaks: we may free 1693b922e19dSJiri Slaby * the irq here so the queue might never be woken up. Note 1694b922e19dSJiri Slaby * that we won't end up waiting on delta_msr_wait again since 1695b922e19dSJiri Slaby * any outstanding file descriptors should be pointing at 1696b922e19dSJiri Slaby * hung_up_tty_fops now. 1697b922e19dSJiri Slaby */ 1698b922e19dSJiri Slaby wake_up_interruptible(&port->delta_msr_wait); 1699b922e19dSJiri Slaby 1700b922e19dSJiri Slaby /* 1701b922e19dSJiri Slaby * Free the IRQ and disable the port. 1702b922e19dSJiri Slaby */ 1703af224ca2SPeter Hurley if (uport) 1704b922e19dSJiri Slaby uport->ops->shutdown(uport); 1705b922e19dSJiri Slaby 1706b922e19dSJiri Slaby /* 1707b922e19dSJiri Slaby * Ensure that the IRQ handler isn't running on another CPU. 1708b922e19dSJiri Slaby */ 1709af224ca2SPeter Hurley if (uport) 1710b922e19dSJiri Slaby synchronize_irq(uport->irq); 17110b1db830SJiri Slaby } 17120b1db830SJiri Slaby 1713ab4382d2SGreg Kroah-Hartman static int uart_carrier_raised(struct tty_port *port) 1714ab4382d2SGreg Kroah-Hartman { 1715ab4382d2SGreg Kroah-Hartman struct uart_state *state = container_of(port, struct uart_state, port); 17169ed19428SPeter Hurley struct uart_port *uport; 1717ab4382d2SGreg Kroah-Hartman int mctrl; 17189ed19428SPeter Hurley 17199ed19428SPeter Hurley uport = uart_port_ref(state); 17209ed19428SPeter Hurley /* 17219ed19428SPeter Hurley * Should never observe uport == NULL since checks for hangup should 17229ed19428SPeter Hurley * abort the tty_port_block_til_ready() loop before checking for carrier 17239ed19428SPeter Hurley * raised -- but report carrier raised if it does anyway so open will 17249ed19428SPeter Hurley * continue and not sleep 17259ed19428SPeter Hurley */ 17269ed19428SPeter Hurley if (WARN_ON(!uport)) 17279ed19428SPeter Hurley return 1; 1728ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 17291fdc3106SAlexander Shiyan uart_enable_ms(uport); 1730ab4382d2SGreg Kroah-Hartman mctrl = uport->ops->get_mctrl(uport); 1731ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 17329ed19428SPeter Hurley uart_port_deref(uport); 1733ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_CAR) 1734ab4382d2SGreg Kroah-Hartman return 1; 1735ab4382d2SGreg Kroah-Hartman return 0; 1736ab4382d2SGreg Kroah-Hartman } 1737ab4382d2SGreg Kroah-Hartman 1738a6845e1eSRafael Gago static void uart_dtr_rts(struct tty_port *port, int raise) 1739ab4382d2SGreg Kroah-Hartman { 1740ab4382d2SGreg Kroah-Hartman struct uart_state *state = container_of(port, struct uart_state, port); 17419ed19428SPeter Hurley struct uart_port *uport; 17429ed19428SPeter Hurley 17439ed19428SPeter Hurley uport = uart_port_ref(state); 17449ed19428SPeter Hurley if (!uport) 17459ed19428SPeter Hurley return; 1746a6845e1eSRafael Gago uart_port_dtr_rts(uport, raise); 17479ed19428SPeter Hurley uart_port_deref(uport); 1748ab4382d2SGreg Kroah-Hartman } 1749ab4382d2SGreg Kroah-Hartman 1750ab4382d2SGreg Kroah-Hartman /* 1751ef4f527cSKevin Cernekee * Calls to uart_open are serialised by the tty_lock in 1752ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:tty_open() 1753ab4382d2SGreg Kroah-Hartman * Note that if this fails, then uart_close() _will_ be called. 1754ab4382d2SGreg Kroah-Hartman * 1755ab4382d2SGreg Kroah-Hartman * In time, we want to scrap the "opening nonpresent ports" 1756ab4382d2SGreg Kroah-Hartman * behaviour and implement an alternative way for setserial 1757ab4382d2SGreg Kroah-Hartman * to set base addresses/ports/types. This will allow us to 1758ab4382d2SGreg Kroah-Hartman * get rid of a certain amount of extra tests. 1759ab4382d2SGreg Kroah-Hartman */ 1760ab4382d2SGreg Kroah-Hartman static int uart_open(struct tty_struct *tty, struct file *filp) 1761ab4382d2SGreg Kroah-Hartman { 17625e388027SPeter Hurley struct uart_driver *drv = tty->driver->driver_state; 1763ab4382d2SGreg Kroah-Hartman int retval, line = tty->index; 17641c7b13c4SJiri Slaby struct uart_state *state = drv->state + line; 1765ab4382d2SGreg Kroah-Hartman 1766ab4382d2SGreg Kroah-Hartman tty->driver_data = state; 1767b3b57646SRob Herring 1768b3b57646SRob Herring retval = tty_port_open(&state->port, tty, filp); 1769b3b57646SRob Herring if (retval > 0) 1770b3b57646SRob Herring retval = 0; 1771b3b57646SRob Herring 1772b3b57646SRob Herring return retval; 1773b3b57646SRob Herring } 1774b3b57646SRob Herring 1775b3b57646SRob Herring static int uart_port_activate(struct tty_port *port, struct tty_struct *tty) 1776b3b57646SRob Herring { 1777b3b57646SRob Herring struct uart_state *state = container_of(port, struct uart_state, port); 1778b3b57646SRob Herring struct uart_port *uport; 1779b3b57646SRob Herring 1780b3b57646SRob Herring uport = uart_port_check(state); 1781b3b57646SRob Herring if (!uport || uport->flags & UPF_DEAD) 1782b3b57646SRob Herring return -ENXIO; 1783b3b57646SRob Herring 17844047b371SPeter Hurley port->low_latency = (uport->flags & UPF_LOW_LATENCY) ? 1 : 0; 1785ab4382d2SGreg Kroah-Hartman 1786ab4382d2SGreg Kroah-Hartman /* 1787ab4382d2SGreg Kroah-Hartman * Start up the serial port. 1788ab4382d2SGreg Kroah-Hartman */ 1789b3b57646SRob Herring return uart_startup(tty, state, 0); 1790ab4382d2SGreg Kroah-Hartman } 1791ab4382d2SGreg Kroah-Hartman 1792ab4382d2SGreg Kroah-Hartman static const char *uart_type(struct uart_port *port) 1793ab4382d2SGreg Kroah-Hartman { 1794ab4382d2SGreg Kroah-Hartman const char *str = NULL; 1795ab4382d2SGreg Kroah-Hartman 1796ab4382d2SGreg Kroah-Hartman if (port->ops->type) 1797ab4382d2SGreg Kroah-Hartman str = port->ops->type(port); 1798ab4382d2SGreg Kroah-Hartman 1799ab4382d2SGreg Kroah-Hartman if (!str) 1800ab4382d2SGreg Kroah-Hartman str = "unknown"; 1801ab4382d2SGreg Kroah-Hartman 1802ab4382d2SGreg Kroah-Hartman return str; 1803ab4382d2SGreg Kroah-Hartman } 1804ab4382d2SGreg Kroah-Hartman 1805ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_PROC_FS 1806ab4382d2SGreg Kroah-Hartman 1807ab4382d2SGreg Kroah-Hartman static void uart_line_info(struct seq_file *m, struct uart_driver *drv, int i) 1808ab4382d2SGreg Kroah-Hartman { 1809ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + i; 1810ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 18116f538fe3SLinus Walleij enum uart_pm_state pm_state; 18124047b371SPeter Hurley struct uart_port *uport; 1813ab4382d2SGreg Kroah-Hartman char stat_buf[32]; 1814ab4382d2SGreg Kroah-Hartman unsigned int status; 1815ab4382d2SGreg Kroah-Hartman int mmio; 1816ab4382d2SGreg Kroah-Hartman 18174047b371SPeter Hurley mutex_lock(&port->mutex); 18184047b371SPeter Hurley uport = uart_port_check(state); 1819ab4382d2SGreg Kroah-Hartman if (!uport) 18204047b371SPeter Hurley goto out; 1821ab4382d2SGreg Kroah-Hartman 1822ab4382d2SGreg Kroah-Hartman mmio = uport->iotype >= UPIO_MEM; 1823ab4382d2SGreg Kroah-Hartman seq_printf(m, "%d: uart:%s %s%08llX irq:%d", 1824ab4382d2SGreg Kroah-Hartman uport->line, uart_type(uport), 1825ab4382d2SGreg Kroah-Hartman mmio ? "mmio:0x" : "port:", 1826ab4382d2SGreg Kroah-Hartman mmio ? (unsigned long long)uport->mapbase 1827ab4382d2SGreg Kroah-Hartman : (unsigned long long)uport->iobase, 1828ab4382d2SGreg Kroah-Hartman uport->irq); 1829ab4382d2SGreg Kroah-Hartman 1830ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) { 1831ab4382d2SGreg Kroah-Hartman seq_putc(m, '\n'); 18324047b371SPeter Hurley goto out; 1833ab4382d2SGreg Kroah-Hartman } 1834ab4382d2SGreg Kroah-Hartman 1835ab4382d2SGreg Kroah-Hartman if (capable(CAP_SYS_ADMIN)) { 1836ab4382d2SGreg Kroah-Hartman pm_state = state->pm_state; 18376f538fe3SLinus Walleij if (pm_state != UART_PM_STATE_ON) 18386f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 1839ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1840ab4382d2SGreg Kroah-Hartman status = uport->ops->get_mctrl(uport); 1841ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 18426f538fe3SLinus Walleij if (pm_state != UART_PM_STATE_ON) 1843ab4382d2SGreg Kroah-Hartman uart_change_pm(state, pm_state); 1844ab4382d2SGreg Kroah-Hartman 1845ab4382d2SGreg Kroah-Hartman seq_printf(m, " tx:%d rx:%d", 1846ab4382d2SGreg Kroah-Hartman uport->icount.tx, uport->icount.rx); 1847ab4382d2SGreg Kroah-Hartman if (uport->icount.frame) 1848968af298SPeter Hurley seq_printf(m, " fe:%d", uport->icount.frame); 1849ab4382d2SGreg Kroah-Hartman if (uport->icount.parity) 1850968af298SPeter Hurley seq_printf(m, " pe:%d", uport->icount.parity); 1851ab4382d2SGreg Kroah-Hartman if (uport->icount.brk) 1852968af298SPeter Hurley seq_printf(m, " brk:%d", uport->icount.brk); 1853ab4382d2SGreg Kroah-Hartman if (uport->icount.overrun) 1854968af298SPeter Hurley seq_printf(m, " oe:%d", uport->icount.overrun); 18554f794097SJeremy Kerr if (uport->icount.buf_overrun) 18564f794097SJeremy Kerr seq_printf(m, " bo:%d", uport->icount.buf_overrun); 1857ab4382d2SGreg Kroah-Hartman 1858ab4382d2SGreg Kroah-Hartman #define INFOBIT(bit, str) \ 1859ab4382d2SGreg Kroah-Hartman if (uport->mctrl & (bit)) \ 1860ab4382d2SGreg Kroah-Hartman strncat(stat_buf, (str), sizeof(stat_buf) - \ 1861ab4382d2SGreg Kroah-Hartman strlen(stat_buf) - 2) 1862ab4382d2SGreg Kroah-Hartman #define STATBIT(bit, str) \ 1863ab4382d2SGreg Kroah-Hartman if (status & (bit)) \ 1864ab4382d2SGreg Kroah-Hartman strncat(stat_buf, (str), sizeof(stat_buf) - \ 1865ab4382d2SGreg Kroah-Hartman strlen(stat_buf) - 2) 1866ab4382d2SGreg Kroah-Hartman 1867ab4382d2SGreg Kroah-Hartman stat_buf[0] = '\0'; 1868ab4382d2SGreg Kroah-Hartman stat_buf[1] = '\0'; 1869ab4382d2SGreg Kroah-Hartman INFOBIT(TIOCM_RTS, "|RTS"); 1870ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_CTS, "|CTS"); 1871ab4382d2SGreg Kroah-Hartman INFOBIT(TIOCM_DTR, "|DTR"); 1872ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_DSR, "|DSR"); 1873ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_CAR, "|CD"); 1874ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_RNG, "|RI"); 1875ab4382d2SGreg Kroah-Hartman if (stat_buf[0]) 1876ab4382d2SGreg Kroah-Hartman stat_buf[0] = ' '; 1877ab4382d2SGreg Kroah-Hartman 1878ab4382d2SGreg Kroah-Hartman seq_puts(m, stat_buf); 1879ab4382d2SGreg Kroah-Hartman } 1880ab4382d2SGreg Kroah-Hartman seq_putc(m, '\n'); 1881ab4382d2SGreg Kroah-Hartman #undef STATBIT 1882ab4382d2SGreg Kroah-Hartman #undef INFOBIT 18834047b371SPeter Hurley out: 18844047b371SPeter Hurley mutex_unlock(&port->mutex); 1885ab4382d2SGreg Kroah-Hartman } 1886ab4382d2SGreg Kroah-Hartman 1887ab4382d2SGreg Kroah-Hartman static int uart_proc_show(struct seq_file *m, void *v) 1888ab4382d2SGreg Kroah-Hartman { 1889ab4382d2SGreg Kroah-Hartman struct tty_driver *ttydrv = m->private; 1890ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = ttydrv->driver_state; 1891ab4382d2SGreg Kroah-Hartman int i; 1892ab4382d2SGreg Kroah-Hartman 1893968af298SPeter Hurley seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n", "", "", ""); 1894ab4382d2SGreg Kroah-Hartman for (i = 0; i < drv->nr; i++) 1895ab4382d2SGreg Kroah-Hartman uart_line_info(m, drv, i); 1896ab4382d2SGreg Kroah-Hartman return 0; 1897ab4382d2SGreg Kroah-Hartman } 1898ab4382d2SGreg Kroah-Hartman #endif 1899ab4382d2SGreg Kroah-Hartman 1900ab4382d2SGreg Kroah-Hartman #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL) 19011cfe42b7SPeter Hurley /** 1902ab4382d2SGreg Kroah-Hartman * uart_console_write - write a console message to a serial port 1903ab4382d2SGreg Kroah-Hartman * @port: the port to write the message 1904ab4382d2SGreg Kroah-Hartman * @s: array of characters 1905ab4382d2SGreg Kroah-Hartman * @count: number of characters in string to write 190610afbe34SPeter Hurley * @putchar: function to write character to port 1907ab4382d2SGreg Kroah-Hartman */ 1908ab4382d2SGreg Kroah-Hartman void uart_console_write(struct uart_port *port, const char *s, 1909ab4382d2SGreg Kroah-Hartman unsigned int count, 1910ab4382d2SGreg Kroah-Hartman void (*putchar)(struct uart_port *, int)) 1911ab4382d2SGreg Kroah-Hartman { 1912ab4382d2SGreg Kroah-Hartman unsigned int i; 1913ab4382d2SGreg Kroah-Hartman 1914ab4382d2SGreg Kroah-Hartman for (i = 0; i < count; i++, s++) { 1915ab4382d2SGreg Kroah-Hartman if (*s == '\n') 1916ab4382d2SGreg Kroah-Hartman putchar(port, '\r'); 1917ab4382d2SGreg Kroah-Hartman putchar(port, *s); 1918ab4382d2SGreg Kroah-Hartman } 1919ab4382d2SGreg Kroah-Hartman } 1920ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_console_write); 1921ab4382d2SGreg Kroah-Hartman 1922ab4382d2SGreg Kroah-Hartman /* 1923ab4382d2SGreg Kroah-Hartman * Check whether an invalid uart number has been specified, and 1924ab4382d2SGreg Kroah-Hartman * if so, search for the first available port that does have 1925ab4382d2SGreg Kroah-Hartman * console support. 1926ab4382d2SGreg Kroah-Hartman */ 1927ab4382d2SGreg Kroah-Hartman struct uart_port * __init 1928ab4382d2SGreg Kroah-Hartman uart_get_console(struct uart_port *ports, int nr, struct console *co) 1929ab4382d2SGreg Kroah-Hartman { 1930ab4382d2SGreg Kroah-Hartman int idx = co->index; 1931ab4382d2SGreg Kroah-Hartman 1932ab4382d2SGreg Kroah-Hartman if (idx < 0 || idx >= nr || (ports[idx].iobase == 0 && 1933ab4382d2SGreg Kroah-Hartman ports[idx].membase == NULL)) 1934ab4382d2SGreg Kroah-Hartman for (idx = 0; idx < nr; idx++) 1935ab4382d2SGreg Kroah-Hartman if (ports[idx].iobase != 0 || 1936ab4382d2SGreg Kroah-Hartman ports[idx].membase != NULL) 1937ab4382d2SGreg Kroah-Hartman break; 1938ab4382d2SGreg Kroah-Hartman 1939ab4382d2SGreg Kroah-Hartman co->index = idx; 1940ab4382d2SGreg Kroah-Hartman 1941ab4382d2SGreg Kroah-Hartman return ports + idx; 1942ab4382d2SGreg Kroah-Hartman } 1943ab4382d2SGreg Kroah-Hartman 1944ab4382d2SGreg Kroah-Hartman /** 194573abaf87SPeter Hurley * uart_parse_earlycon - Parse earlycon options 194673abaf87SPeter Hurley * @p: ptr to 2nd field (ie., just beyond '<name>,') 194773abaf87SPeter Hurley * @iotype: ptr for decoded iotype (out) 194873abaf87SPeter Hurley * @addr: ptr for decoded mapbase/iobase (out) 194973abaf87SPeter Hurley * @options: ptr for <options> field; NULL if not present (out) 195073abaf87SPeter Hurley * 195173abaf87SPeter Hurley * Decodes earlycon kernel command line parameters of the form 1952bd94c407SMasahiro Yamada * earlycon=<name>,io|mmio|mmio16|mmio32|mmio32be|mmio32native,<addr>,<options> 1953bd94c407SMasahiro Yamada * console=<name>,io|mmio|mmio16|mmio32|mmio32be|mmio32native,<addr>,<options> 195473abaf87SPeter Hurley * 195573abaf87SPeter Hurley * The optional form 195673abaf87SPeter Hurley * earlycon=<name>,0x<addr>,<options> 195773abaf87SPeter Hurley * console=<name>,0x<addr>,<options> 195873abaf87SPeter Hurley * is also accepted; the returned @iotype will be UPIO_MEM. 195973abaf87SPeter Hurley * 19608b2303deSAlexander Sverdlin * Returns 0 on success or -EINVAL on failure 196173abaf87SPeter Hurley */ 196246e36683SAlexander Sverdlin int uart_parse_earlycon(char *p, unsigned char *iotype, resource_size_t *addr, 196373abaf87SPeter Hurley char **options) 196473abaf87SPeter Hurley { 196573abaf87SPeter Hurley if (strncmp(p, "mmio,", 5) == 0) { 196673abaf87SPeter Hurley *iotype = UPIO_MEM; 196773abaf87SPeter Hurley p += 5; 1968bd94c407SMasahiro Yamada } else if (strncmp(p, "mmio16,", 7) == 0) { 1969bd94c407SMasahiro Yamada *iotype = UPIO_MEM16; 1970bd94c407SMasahiro Yamada p += 7; 197173abaf87SPeter Hurley } else if (strncmp(p, "mmio32,", 7) == 0) { 197273abaf87SPeter Hurley *iotype = UPIO_MEM32; 197373abaf87SPeter Hurley p += 7; 19746e63be3fSNoam Camus } else if (strncmp(p, "mmio32be,", 9) == 0) { 19756e63be3fSNoam Camus *iotype = UPIO_MEM32BE; 19766e63be3fSNoam Camus p += 9; 1977d215d809SMax Filippov } else if (strncmp(p, "mmio32native,", 13) == 0) { 1978d215d809SMax Filippov *iotype = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) ? 1979d215d809SMax Filippov UPIO_MEM32BE : UPIO_MEM32; 1980d215d809SMax Filippov p += 13; 198173abaf87SPeter Hurley } else if (strncmp(p, "io,", 3) == 0) { 198273abaf87SPeter Hurley *iotype = UPIO_PORT; 198373abaf87SPeter Hurley p += 3; 198473abaf87SPeter Hurley } else if (strncmp(p, "0x", 2) == 0) { 198573abaf87SPeter Hurley *iotype = UPIO_MEM; 198673abaf87SPeter Hurley } else { 198773abaf87SPeter Hurley return -EINVAL; 198873abaf87SPeter Hurley } 198973abaf87SPeter Hurley 19908b2303deSAlexander Sverdlin /* 19918b2303deSAlexander Sverdlin * Before you replace it with kstrtoull(), think about options separator 19928b2303deSAlexander Sverdlin * (',') it will not tolerate 19938b2303deSAlexander Sverdlin */ 19948b2303deSAlexander Sverdlin *addr = simple_strtoull(p, NULL, 0); 199573abaf87SPeter Hurley p = strchr(p, ','); 199673abaf87SPeter Hurley if (p) 199773abaf87SPeter Hurley p++; 199873abaf87SPeter Hurley 199973abaf87SPeter Hurley *options = p; 200073abaf87SPeter Hurley return 0; 200173abaf87SPeter Hurley } 200273abaf87SPeter Hurley EXPORT_SYMBOL_GPL(uart_parse_earlycon); 200373abaf87SPeter Hurley 200473abaf87SPeter Hurley /** 200502088ca6SGeert Uytterhoeven * uart_parse_options - Parse serial port baud/parity/bits/flow control. 2006ab4382d2SGreg Kroah-Hartman * @options: pointer to option string 2007ab4382d2SGreg Kroah-Hartman * @baud: pointer to an 'int' variable for the baud rate. 2008ab4382d2SGreg Kroah-Hartman * @parity: pointer to an 'int' variable for the parity. 2009ab4382d2SGreg Kroah-Hartman * @bits: pointer to an 'int' variable for the number of data bits. 2010ab4382d2SGreg Kroah-Hartman * @flow: pointer to an 'int' variable for the flow control character. 2011ab4382d2SGreg Kroah-Hartman * 2012ab4382d2SGreg Kroah-Hartman * uart_parse_options decodes a string containing the serial console 2013ab4382d2SGreg Kroah-Hartman * options. The format of the string is <baud><parity><bits><flow>, 2014ab4382d2SGreg Kroah-Hartman * eg: 115200n8r 2015ab4382d2SGreg Kroah-Hartman */ 2016ab4382d2SGreg Kroah-Hartman void 20170f646b63SPaul Cercueil uart_parse_options(const char *options, int *baud, int *parity, 20180f646b63SPaul Cercueil int *bits, int *flow) 2019ab4382d2SGreg Kroah-Hartman { 20200f646b63SPaul Cercueil const char *s = options; 2021ab4382d2SGreg Kroah-Hartman 2022ab4382d2SGreg Kroah-Hartman *baud = simple_strtoul(s, NULL, 10); 2023ab4382d2SGreg Kroah-Hartman while (*s >= '0' && *s <= '9') 2024ab4382d2SGreg Kroah-Hartman s++; 2025ab4382d2SGreg Kroah-Hartman if (*s) 2026ab4382d2SGreg Kroah-Hartman *parity = *s++; 2027ab4382d2SGreg Kroah-Hartman if (*s) 2028ab4382d2SGreg Kroah-Hartman *bits = *s++ - '0'; 2029ab4382d2SGreg Kroah-Hartman if (*s) 2030ab4382d2SGreg Kroah-Hartman *flow = *s; 2031ab4382d2SGreg Kroah-Hartman } 2032ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_parse_options); 2033ab4382d2SGreg Kroah-Hartman 2034ab4382d2SGreg Kroah-Hartman /** 2035ab4382d2SGreg Kroah-Hartman * uart_set_options - setup the serial console parameters 2036ab4382d2SGreg Kroah-Hartman * @port: pointer to the serial ports uart_port structure 2037ab4382d2SGreg Kroah-Hartman * @co: console pointer 2038ab4382d2SGreg Kroah-Hartman * @baud: baud rate 2039ab4382d2SGreg Kroah-Hartman * @parity: parity character - 'n' (none), 'o' (odd), 'e' (even) 2040ab4382d2SGreg Kroah-Hartman * @bits: number of data bits 2041ab4382d2SGreg Kroah-Hartman * @flow: flow control character - 'r' (rts) 2042ab4382d2SGreg Kroah-Hartman */ 2043ab4382d2SGreg Kroah-Hartman int 2044ab4382d2SGreg Kroah-Hartman uart_set_options(struct uart_port *port, struct console *co, 2045ab4382d2SGreg Kroah-Hartman int baud, int parity, int bits, int flow) 2046ab4382d2SGreg Kroah-Hartman { 2047ab4382d2SGreg Kroah-Hartman struct ktermios termios; 2048ab4382d2SGreg Kroah-Hartman static struct ktermios dummy; 2049ab4382d2SGreg Kroah-Hartman 2050ab4382d2SGreg Kroah-Hartman /* 2051ab4382d2SGreg Kroah-Hartman * Ensure that the serial console lock is initialised 2052ab4382d2SGreg Kroah-Hartman * early. 205342b6a1baSRandy Witt * If this port is a console, then the spinlock is already 205442b6a1baSRandy Witt * initialised. 2055ab4382d2SGreg Kroah-Hartman */ 205642b6a1baSRandy Witt if (!(uart_console(port) && (port->cons->flags & CON_ENABLED))) { 2057ab4382d2SGreg Kroah-Hartman spin_lock_init(&port->lock); 2058ab4382d2SGreg Kroah-Hartman lockdep_set_class(&port->lock, &port_lock_key); 205942b6a1baSRandy Witt } 2060ab4382d2SGreg Kroah-Hartman 2061ab4382d2SGreg Kroah-Hartman memset(&termios, 0, sizeof(struct ktermios)); 2062ab4382d2SGreg Kroah-Hartman 2063ba47f97aSJeffy Chen termios.c_cflag |= CREAD | HUPCL | CLOCAL; 2064ba47f97aSJeffy Chen tty_termios_encode_baud_rate(&termios, baud, baud); 2065ab4382d2SGreg Kroah-Hartman 2066ab4382d2SGreg Kroah-Hartman if (bits == 7) 2067ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CS7; 2068ab4382d2SGreg Kroah-Hartman else 2069ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CS8; 2070ab4382d2SGreg Kroah-Hartman 2071ab4382d2SGreg Kroah-Hartman switch (parity) { 2072ab4382d2SGreg Kroah-Hartman case 'o': case 'O': 2073ab4382d2SGreg Kroah-Hartman termios.c_cflag |= PARODD; 2074ab4382d2SGreg Kroah-Hartman /*fall through*/ 2075ab4382d2SGreg Kroah-Hartman case 'e': case 'E': 2076ab4382d2SGreg Kroah-Hartman termios.c_cflag |= PARENB; 2077ab4382d2SGreg Kroah-Hartman break; 2078ab4382d2SGreg Kroah-Hartman } 2079ab4382d2SGreg Kroah-Hartman 2080ab4382d2SGreg Kroah-Hartman if (flow == 'r') 2081ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CRTSCTS; 2082ab4382d2SGreg Kroah-Hartman 2083ab4382d2SGreg Kroah-Hartman /* 2084ab4382d2SGreg Kroah-Hartman * some uarts on other side don't support no flow control. 2085ab4382d2SGreg Kroah-Hartman * So we set * DTR in host uart to make them happy 2086ab4382d2SGreg Kroah-Hartman */ 2087ab4382d2SGreg Kroah-Hartman port->mctrl |= TIOCM_DTR; 2088ab4382d2SGreg Kroah-Hartman 2089ab4382d2SGreg Kroah-Hartman port->ops->set_termios(port, &termios, &dummy); 2090ab4382d2SGreg Kroah-Hartman /* 2091ab4382d2SGreg Kroah-Hartman * Allow the setting of the UART parameters with a NULL console 2092ab4382d2SGreg Kroah-Hartman * too: 2093ab4382d2SGreg Kroah-Hartman */ 2094ab4382d2SGreg Kroah-Hartman if (co) 2095ab4382d2SGreg Kroah-Hartman co->cflag = termios.c_cflag; 2096ab4382d2SGreg Kroah-Hartman 2097ab4382d2SGreg Kroah-Hartman return 0; 2098ab4382d2SGreg Kroah-Hartman } 2099ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_set_options); 2100ab4382d2SGreg Kroah-Hartman #endif /* CONFIG_SERIAL_CORE_CONSOLE */ 2101ab4382d2SGreg Kroah-Hartman 2102cf75525fSJiri Slaby /** 2103cf75525fSJiri Slaby * uart_change_pm - set power state of the port 2104cf75525fSJiri Slaby * 2105cf75525fSJiri Slaby * @state: port descriptor 2106cf75525fSJiri Slaby * @pm_state: new state 2107cf75525fSJiri Slaby * 2108cf75525fSJiri Slaby * Locking: port->mutex has to be held 2109cf75525fSJiri Slaby */ 21106f538fe3SLinus Walleij static void uart_change_pm(struct uart_state *state, 21116f538fe3SLinus Walleij enum uart_pm_state pm_state) 2112ab4382d2SGreg Kroah-Hartman { 21134047b371SPeter Hurley struct uart_port *port = uart_port_check(state); 2114ab4382d2SGreg Kroah-Hartman 2115ab4382d2SGreg Kroah-Hartman if (state->pm_state != pm_state) { 21164047b371SPeter Hurley if (port && port->ops->pm) 2117ab4382d2SGreg Kroah-Hartman port->ops->pm(port, pm_state, state->pm_state); 2118ab4382d2SGreg Kroah-Hartman state->pm_state = pm_state; 2119ab4382d2SGreg Kroah-Hartman } 2120ab4382d2SGreg Kroah-Hartman } 2121ab4382d2SGreg Kroah-Hartman 2122ab4382d2SGreg Kroah-Hartman struct uart_match { 2123ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2124ab4382d2SGreg Kroah-Hartman struct uart_driver *driver; 2125ab4382d2SGreg Kroah-Hartman }; 2126ab4382d2SGreg Kroah-Hartman 2127ab4382d2SGreg Kroah-Hartman static int serial_match_port(struct device *dev, void *data) 2128ab4382d2SGreg Kroah-Hartman { 2129ab4382d2SGreg Kroah-Hartman struct uart_match *match = data; 2130ab4382d2SGreg Kroah-Hartman struct tty_driver *tty_drv = match->driver->tty_driver; 2131ab4382d2SGreg Kroah-Hartman dev_t devt = MKDEV(tty_drv->major, tty_drv->minor_start) + 2132ab4382d2SGreg Kroah-Hartman match->port->line; 2133ab4382d2SGreg Kroah-Hartman 2134ab4382d2SGreg Kroah-Hartman return dev->devt == devt; /* Actually, only one tty per port */ 2135ab4382d2SGreg Kroah-Hartman } 2136ab4382d2SGreg Kroah-Hartman 2137ab4382d2SGreg Kroah-Hartman int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport) 2138ab4382d2SGreg Kroah-Hartman { 2139ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 2140ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2141ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 2142ab4382d2SGreg Kroah-Hartman struct uart_match match = {uport, drv}; 2143ab4382d2SGreg Kroah-Hartman 2144ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2145ab4382d2SGreg Kroah-Hartman 2146ab4382d2SGreg Kroah-Hartman tty_dev = device_find_child(uport->dev, &match, serial_match_port); 214788e2582eSLucas Stach if (tty_dev && device_may_wakeup(tty_dev)) { 2148aef3ad10SAndy Shevchenko enable_irq_wake(uport->irq); 2149ab4382d2SGreg Kroah-Hartman put_device(tty_dev); 2150ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2151ab4382d2SGreg Kroah-Hartman return 0; 2152ab4382d2SGreg Kroah-Hartman } 21535a65dcc0SFederico Vaga put_device(tty_dev); 21545a65dcc0SFederico Vaga 2155b164c972SPeter Hurley /* Nothing to do if the console is not suspending */ 2156b164c972SPeter Hurley if (!console_suspend_enabled && uart_console(uport)) 2157b164c972SPeter Hurley goto unlock; 2158b164c972SPeter Hurley 2159ab4382d2SGreg Kroah-Hartman uport->suspended = 1; 2160ab4382d2SGreg Kroah-Hartman 2161d41861caSPeter Hurley if (tty_port_initialized(port)) { 2162ab4382d2SGreg Kroah-Hartman const struct uart_ops *ops = uport->ops; 2163ab4382d2SGreg Kroah-Hartman int tries; 2164ab4382d2SGreg Kroah-Hartman 216580f02d54SPeter Hurley tty_port_set_suspended(port, 1); 2166d41861caSPeter Hurley tty_port_set_initialized(port, 0); 2167ab4382d2SGreg Kroah-Hartman 2168ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 2169ab4382d2SGreg Kroah-Hartman ops->stop_tx(uport); 2170ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, 0); 2171ab4382d2SGreg Kroah-Hartman ops->stop_rx(uport); 2172ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2173ab4382d2SGreg Kroah-Hartman 2174ab4382d2SGreg Kroah-Hartman /* 2175ab4382d2SGreg Kroah-Hartman * Wait for the transmitter to empty. 2176ab4382d2SGreg Kroah-Hartman */ 2177ab4382d2SGreg Kroah-Hartman for (tries = 3; !ops->tx_empty(uport) && tries; tries--) 2178ab4382d2SGreg Kroah-Hartman msleep(10); 2179ab4382d2SGreg Kroah-Hartman if (!tries) 2180cade3580SAndy Shevchenko dev_err(uport->dev, "%s: Unable to drain transmitter\n", 2181cade3580SAndy Shevchenko uport->name); 2182ab4382d2SGreg Kroah-Hartman 2183ab4382d2SGreg Kroah-Hartman ops->shutdown(uport); 2184ab4382d2SGreg Kroah-Hartman } 2185ab4382d2SGreg Kroah-Hartman 2186ab4382d2SGreg Kroah-Hartman /* 2187ab4382d2SGreg Kroah-Hartman * Disable the console device before suspending. 2188ab4382d2SGreg Kroah-Hartman */ 2189b164c972SPeter Hurley if (uart_console(uport)) 2190ab4382d2SGreg Kroah-Hartman console_stop(uport->cons); 2191ab4382d2SGreg Kroah-Hartman 21926f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_OFF); 2193b164c972SPeter Hurley unlock: 2194ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2195ab4382d2SGreg Kroah-Hartman 2196ab4382d2SGreg Kroah-Hartman return 0; 2197ab4382d2SGreg Kroah-Hartman } 2198ab4382d2SGreg Kroah-Hartman 2199ab4382d2SGreg Kroah-Hartman int uart_resume_port(struct uart_driver *drv, struct uart_port *uport) 2200ab4382d2SGreg Kroah-Hartman { 2201ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 2202ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2203ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 2204ab4382d2SGreg Kroah-Hartman struct uart_match match = {uport, drv}; 2205ab4382d2SGreg Kroah-Hartman struct ktermios termios; 2206ab4382d2SGreg Kroah-Hartman 2207ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2208ab4382d2SGreg Kroah-Hartman 2209ab4382d2SGreg Kroah-Hartman tty_dev = device_find_child(uport->dev, &match, serial_match_port); 2210ab4382d2SGreg Kroah-Hartman if (!uport->suspended && device_may_wakeup(tty_dev)) { 2211aef3ad10SAndy Shevchenko if (irqd_is_wakeup_set(irq_get_irq_data((uport->irq)))) 2212ab4382d2SGreg Kroah-Hartman disable_irq_wake(uport->irq); 22135a65dcc0SFederico Vaga put_device(tty_dev); 2214ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2215ab4382d2SGreg Kroah-Hartman return 0; 2216ab4382d2SGreg Kroah-Hartman } 22175a65dcc0SFederico Vaga put_device(tty_dev); 2218ab4382d2SGreg Kroah-Hartman uport->suspended = 0; 2219ab4382d2SGreg Kroah-Hartman 2220ab4382d2SGreg Kroah-Hartman /* 2221ab4382d2SGreg Kroah-Hartman * Re-enable the console device after suspending. 2222ab4382d2SGreg Kroah-Hartman */ 22235933a161SYin Kangkai if (uart_console(uport)) { 2224ab4382d2SGreg Kroah-Hartman /* 2225ab4382d2SGreg Kroah-Hartman * First try to use the console cflag setting. 2226ab4382d2SGreg Kroah-Hartman */ 2227ab4382d2SGreg Kroah-Hartman memset(&termios, 0, sizeof(struct ktermios)); 2228ab4382d2SGreg Kroah-Hartman termios.c_cflag = uport->cons->cflag; 2229ab4382d2SGreg Kroah-Hartman 2230ab4382d2SGreg Kroah-Hartman /* 2231ab4382d2SGreg Kroah-Hartman * If that's unset, use the tty termios setting. 2232ab4382d2SGreg Kroah-Hartman */ 2233adc8d746SAlan Cox if (port->tty && termios.c_cflag == 0) 2234adc8d746SAlan Cox termios = port->tty->termios; 2235ab4382d2SGreg Kroah-Hartman 223694abc56fSNing Jiang if (console_suspend_enabled) 22376f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2238ab4382d2SGreg Kroah-Hartman uport->ops->set_termios(uport, &termios, NULL); 22395933a161SYin Kangkai if (console_suspend_enabled) 2240ab4382d2SGreg Kroah-Hartman console_start(uport->cons); 2241ab4382d2SGreg Kroah-Hartman } 2242ab4382d2SGreg Kroah-Hartman 224380f02d54SPeter Hurley if (tty_port_suspended(port)) { 2244ab4382d2SGreg Kroah-Hartman const struct uart_ops *ops = uport->ops; 2245ab4382d2SGreg Kroah-Hartman int ret; 2246ab4382d2SGreg Kroah-Hartman 22476f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2248ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 2249ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, 0); 2250ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2251ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) { 2252ab4382d2SGreg Kroah-Hartman /* Protected by port mutex for now */ 2253ab4382d2SGreg Kroah-Hartman struct tty_struct *tty = port->tty; 2254ab4382d2SGreg Kroah-Hartman ret = ops->startup(uport); 2255ab4382d2SGreg Kroah-Hartman if (ret == 0) { 2256ab4382d2SGreg Kroah-Hartman if (tty) 2257ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 2258ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 2259ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, uport->mctrl); 2260ab4382d2SGreg Kroah-Hartman ops->start_tx(uport); 2261ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2262d41861caSPeter Hurley tty_port_set_initialized(port, 1); 2263ab4382d2SGreg Kroah-Hartman } else { 2264ab4382d2SGreg Kroah-Hartman /* 2265ab4382d2SGreg Kroah-Hartman * Failed to resume - maybe hardware went away? 2266ab4382d2SGreg Kroah-Hartman * Clear the "initialized" flag so we won't try 2267ab4382d2SGreg Kroah-Hartman * to call the low level drivers shutdown method. 2268ab4382d2SGreg Kroah-Hartman */ 2269ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 2270ab4382d2SGreg Kroah-Hartman } 2271ab4382d2SGreg Kroah-Hartman } 2272ab4382d2SGreg Kroah-Hartman 227380f02d54SPeter Hurley tty_port_set_suspended(port, 0); 2274ab4382d2SGreg Kroah-Hartman } 2275ab4382d2SGreg Kroah-Hartman 2276ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2277ab4382d2SGreg Kroah-Hartman 2278ab4382d2SGreg Kroah-Hartman return 0; 2279ab4382d2SGreg Kroah-Hartman } 2280ab4382d2SGreg Kroah-Hartman 2281ab4382d2SGreg Kroah-Hartman static inline void 2282ab4382d2SGreg Kroah-Hartman uart_report_port(struct uart_driver *drv, struct uart_port *port) 2283ab4382d2SGreg Kroah-Hartman { 2284ab4382d2SGreg Kroah-Hartman char address[64]; 2285ab4382d2SGreg Kroah-Hartman 2286ab4382d2SGreg Kroah-Hartman switch (port->iotype) { 2287ab4382d2SGreg Kroah-Hartman case UPIO_PORT: 2288ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), "I/O 0x%lx", port->iobase); 2289ab4382d2SGreg Kroah-Hartman break; 2290ab4382d2SGreg Kroah-Hartman case UPIO_HUB6: 2291ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), 2292ab4382d2SGreg Kroah-Hartman "I/O 0x%lx offset 0x%x", port->iobase, port->hub6); 2293ab4382d2SGreg Kroah-Hartman break; 2294ab4382d2SGreg Kroah-Hartman case UPIO_MEM: 2295bd94c407SMasahiro Yamada case UPIO_MEM16: 2296ab4382d2SGreg Kroah-Hartman case UPIO_MEM32: 22973ffb1a81SKevin Cernekee case UPIO_MEM32BE: 2298ab4382d2SGreg Kroah-Hartman case UPIO_AU: 2299ab4382d2SGreg Kroah-Hartman case UPIO_TSI: 2300ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), 2301ab4382d2SGreg Kroah-Hartman "MMIO 0x%llx", (unsigned long long)port->mapbase); 2302ab4382d2SGreg Kroah-Hartman break; 2303ab4382d2SGreg Kroah-Hartman default: 2304ab4382d2SGreg Kroah-Hartman strlcpy(address, "*unknown*", sizeof(address)); 2305ab4382d2SGreg Kroah-Hartman break; 2306ab4382d2SGreg Kroah-Hartman } 2307ab4382d2SGreg Kroah-Hartman 2308cade3580SAndy Shevchenko pr_info("%s%s%s at %s (irq = %d, base_baud = %d) is a %s\n", 230968ed7e1cSJames Bottomley port->dev ? dev_name(port->dev) : "", 231068ed7e1cSJames Bottomley port->dev ? ": " : "", 2311cade3580SAndy Shevchenko port->name, 23127d12b976SKees Cook address, port->irq, port->uartclk / 16, uart_type(port)); 2313ab4382d2SGreg Kroah-Hartman } 2314ab4382d2SGreg Kroah-Hartman 2315ab4382d2SGreg Kroah-Hartman static void 2316ab4382d2SGreg Kroah-Hartman uart_configure_port(struct uart_driver *drv, struct uart_state *state, 2317ab4382d2SGreg Kroah-Hartman struct uart_port *port) 2318ab4382d2SGreg Kroah-Hartman { 2319ab4382d2SGreg Kroah-Hartman unsigned int flags; 2320ab4382d2SGreg Kroah-Hartman 2321ab4382d2SGreg Kroah-Hartman /* 2322ab4382d2SGreg Kroah-Hartman * If there isn't a port here, don't do anything further. 2323ab4382d2SGreg Kroah-Hartman */ 2324ab4382d2SGreg Kroah-Hartman if (!port->iobase && !port->mapbase && !port->membase) 2325ab4382d2SGreg Kroah-Hartman return; 2326ab4382d2SGreg Kroah-Hartman 2327ab4382d2SGreg Kroah-Hartman /* 2328ab4382d2SGreg Kroah-Hartman * Now do the auto configuration stuff. Note that config_port 2329ab4382d2SGreg Kroah-Hartman * is expected to claim the resources and map the port for us. 2330ab4382d2SGreg Kroah-Hartman */ 2331ab4382d2SGreg Kroah-Hartman flags = 0; 2332ab4382d2SGreg Kroah-Hartman if (port->flags & UPF_AUTO_IRQ) 2333ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_IRQ; 2334ab4382d2SGreg Kroah-Hartman if (port->flags & UPF_BOOT_AUTOCONF) { 2335ab4382d2SGreg Kroah-Hartman if (!(port->flags & UPF_FIXED_TYPE)) { 2336ab4382d2SGreg Kroah-Hartman port->type = PORT_UNKNOWN; 2337ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_TYPE; 2338ab4382d2SGreg Kroah-Hartman } 2339ab4382d2SGreg Kroah-Hartman port->ops->config_port(port, flags); 2340ab4382d2SGreg Kroah-Hartman } 2341ab4382d2SGreg Kroah-Hartman 2342ab4382d2SGreg Kroah-Hartman if (port->type != PORT_UNKNOWN) { 2343ab4382d2SGreg Kroah-Hartman unsigned long flags; 2344ab4382d2SGreg Kroah-Hartman 2345ab4382d2SGreg Kroah-Hartman uart_report_port(drv, port); 2346ab4382d2SGreg Kroah-Hartman 2347ab4382d2SGreg Kroah-Hartman /* Power up port for set_mctrl() */ 23486f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2349ab4382d2SGreg Kroah-Hartman 2350ab4382d2SGreg Kroah-Hartman /* 2351ab4382d2SGreg Kroah-Hartman * Ensure that the modem control lines are de-activated. 2352ab4382d2SGreg Kroah-Hartman * keep the DTR setting that is set in uart_set_options() 2353ab4382d2SGreg Kroah-Hartman * We probably don't need a spinlock around this, but 2354ab4382d2SGreg Kroah-Hartman */ 2355ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 2356ab4382d2SGreg Kroah-Hartman port->ops->set_mctrl(port, port->mctrl & TIOCM_DTR); 2357ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 2358ab4382d2SGreg Kroah-Hartman 2359ab4382d2SGreg Kroah-Hartman /* 2360ab4382d2SGreg Kroah-Hartman * If this driver supports console, and it hasn't been 2361ab4382d2SGreg Kroah-Hartman * successfully registered yet, try to re-register it. 2362ab4382d2SGreg Kroah-Hartman * It may be that the port was not available. 2363ab4382d2SGreg Kroah-Hartman */ 2364ab4382d2SGreg Kroah-Hartman if (port->cons && !(port->cons->flags & CON_ENABLED)) 2365ab4382d2SGreg Kroah-Hartman register_console(port->cons); 2366ab4382d2SGreg Kroah-Hartman 2367ab4382d2SGreg Kroah-Hartman /* 2368ab4382d2SGreg Kroah-Hartman * Power down all ports by default, except the 2369ab4382d2SGreg Kroah-Hartman * console if we have one. 2370ab4382d2SGreg Kroah-Hartman */ 2371ab4382d2SGreg Kroah-Hartman if (!uart_console(port)) 23726f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_OFF); 2373ab4382d2SGreg Kroah-Hartman } 2374ab4382d2SGreg Kroah-Hartman } 2375ab4382d2SGreg Kroah-Hartman 2376ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 2377ab4382d2SGreg Kroah-Hartman 2378ab4382d2SGreg Kroah-Hartman static int uart_poll_init(struct tty_driver *driver, int line, char *options) 2379ab4382d2SGreg Kroah-Hartman { 2380ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2381ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 238249c02304SPeter Hurley struct tty_port *tport; 2383ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2384ab4382d2SGreg Kroah-Hartman int baud = 9600; 2385ab4382d2SGreg Kroah-Hartman int bits = 8; 2386ab4382d2SGreg Kroah-Hartman int parity = 'n'; 2387ab4382d2SGreg Kroah-Hartman int flow = 'n'; 238849c02304SPeter Hurley int ret = 0; 2389ab4382d2SGreg Kroah-Hartman 239049c02304SPeter Hurley tport = &state->port; 239149c02304SPeter Hurley mutex_lock(&tport->mutex); 239249c02304SPeter Hurley 23934047b371SPeter Hurley port = uart_port_check(state); 23944047b371SPeter Hurley if (!port || !(port->ops->poll_get_char && port->ops->poll_put_char)) { 239549c02304SPeter Hurley ret = -1; 239649c02304SPeter Hurley goto out; 239749c02304SPeter Hurley } 2398ab4382d2SGreg Kroah-Hartman 2399c7f3e708SAnton Vorontsov if (port->ops->poll_init) { 2400c7f3e708SAnton Vorontsov /* 2401d41861caSPeter Hurley * We don't set initialized as we only initialized the hw, 2402d41861caSPeter Hurley * e.g. state->xmit is still uninitialized. 2403c7f3e708SAnton Vorontsov */ 2404d41861caSPeter Hurley if (!tty_port_initialized(tport)) 2405c7f3e708SAnton Vorontsov ret = port->ops->poll_init(port); 2406c7f3e708SAnton Vorontsov } 2407c7f3e708SAnton Vorontsov 240849c02304SPeter Hurley if (!ret && options) { 2409ab4382d2SGreg Kroah-Hartman uart_parse_options(options, &baud, &parity, &bits, &flow); 241049c02304SPeter Hurley ret = uart_set_options(port, NULL, baud, parity, bits, flow); 2411ab4382d2SGreg Kroah-Hartman } 241249c02304SPeter Hurley out: 241349c02304SPeter Hurley mutex_unlock(&tport->mutex); 241449c02304SPeter Hurley return ret; 2415ab4382d2SGreg Kroah-Hartman } 2416ab4382d2SGreg Kroah-Hartman 2417ab4382d2SGreg Kroah-Hartman static int uart_poll_get_char(struct tty_driver *driver, int line) 2418ab4382d2SGreg Kroah-Hartman { 2419ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2420ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2421ab4382d2SGreg Kroah-Hartman struct uart_port *port; 24229ed19428SPeter Hurley int ret = -1; 2423ab4382d2SGreg Kroah-Hartman 24249ed19428SPeter Hurley port = uart_port_ref(state); 2425ef510beaSAndy Shevchenko if (port) { 24269ed19428SPeter Hurley ret = port->ops->poll_get_char(port); 24279ed19428SPeter Hurley uart_port_deref(port); 24289ed19428SPeter Hurley } 242922077b09SJiri Slaby 24309ed19428SPeter Hurley return ret; 2431ab4382d2SGreg Kroah-Hartman } 2432ab4382d2SGreg Kroah-Hartman 2433ab4382d2SGreg Kroah-Hartman static void uart_poll_put_char(struct tty_driver *driver, int line, char ch) 2434ab4382d2SGreg Kroah-Hartman { 2435ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2436ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2437ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2438ab4382d2SGreg Kroah-Hartman 24399ed19428SPeter Hurley port = uart_port_ref(state); 24409ed19428SPeter Hurley if (!port) 24419ed19428SPeter Hurley return; 2442c7d44a02SDoug Anderson 2443c7d44a02SDoug Anderson if (ch == '\n') 2444c7d44a02SDoug Anderson port->ops->poll_put_char(port, '\r'); 2445ab4382d2SGreg Kroah-Hartman port->ops->poll_put_char(port, ch); 24469ed19428SPeter Hurley uart_port_deref(port); 2447ab4382d2SGreg Kroah-Hartman } 2448ab4382d2SGreg Kroah-Hartman #endif 2449ab4382d2SGreg Kroah-Hartman 2450ab4382d2SGreg Kroah-Hartman static const struct tty_operations uart_ops = { 2451ab4382d2SGreg Kroah-Hartman .open = uart_open, 2452ab4382d2SGreg Kroah-Hartman .close = uart_close, 2453ab4382d2SGreg Kroah-Hartman .write = uart_write, 2454ab4382d2SGreg Kroah-Hartman .put_char = uart_put_char, 2455ab4382d2SGreg Kroah-Hartman .flush_chars = uart_flush_chars, 2456ab4382d2SGreg Kroah-Hartman .write_room = uart_write_room, 2457ab4382d2SGreg Kroah-Hartman .chars_in_buffer= uart_chars_in_buffer, 2458ab4382d2SGreg Kroah-Hartman .flush_buffer = uart_flush_buffer, 2459ab4382d2SGreg Kroah-Hartman .ioctl = uart_ioctl, 2460ab4382d2SGreg Kroah-Hartman .throttle = uart_throttle, 2461ab4382d2SGreg Kroah-Hartman .unthrottle = uart_unthrottle, 2462ab4382d2SGreg Kroah-Hartman .send_xchar = uart_send_xchar, 2463ab4382d2SGreg Kroah-Hartman .set_termios = uart_set_termios, 2464ab4382d2SGreg Kroah-Hartman .set_ldisc = uart_set_ldisc, 2465ab4382d2SGreg Kroah-Hartman .stop = uart_stop, 2466ab4382d2SGreg Kroah-Hartman .start = uart_start, 2467ab4382d2SGreg Kroah-Hartman .hangup = uart_hangup, 2468ab4382d2SGreg Kroah-Hartman .break_ctl = uart_break_ctl, 2469ab4382d2SGreg Kroah-Hartman .wait_until_sent= uart_wait_until_sent, 2470ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_PROC_FS 24718a8dcabfSChristoph Hellwig .proc_show = uart_proc_show, 2472ab4382d2SGreg Kroah-Hartman #endif 2473ab4382d2SGreg Kroah-Hartman .tiocmget = uart_tiocmget, 2474ab4382d2SGreg Kroah-Hartman .tiocmset = uart_tiocmset, 24755099d234SAl Viro .set_serial = uart_set_info_user, 24765099d234SAl Viro .get_serial = uart_get_info_user, 2477ab4382d2SGreg Kroah-Hartman .get_icount = uart_get_icount, 2478ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 2479ab4382d2SGreg Kroah-Hartman .poll_init = uart_poll_init, 2480ab4382d2SGreg Kroah-Hartman .poll_get_char = uart_poll_get_char, 2481ab4382d2SGreg Kroah-Hartman .poll_put_char = uart_poll_put_char, 2482ab4382d2SGreg Kroah-Hartman #endif 2483ab4382d2SGreg Kroah-Hartman }; 2484ab4382d2SGreg Kroah-Hartman 2485ab4382d2SGreg Kroah-Hartman static const struct tty_port_operations uart_port_ops = { 2486ab4382d2SGreg Kroah-Hartman .carrier_raised = uart_carrier_raised, 2487ab4382d2SGreg Kroah-Hartman .dtr_rts = uart_dtr_rts, 2488b3b57646SRob Herring .activate = uart_port_activate, 2489761ed4a9SRob Herring .shutdown = uart_tty_port_shutdown, 2490ab4382d2SGreg Kroah-Hartman }; 2491ab4382d2SGreg Kroah-Hartman 2492ab4382d2SGreg Kroah-Hartman /** 2493ab4382d2SGreg Kroah-Hartman * uart_register_driver - register a driver with the uart core layer 2494ab4382d2SGreg Kroah-Hartman * @drv: low level driver structure 2495ab4382d2SGreg Kroah-Hartman * 2496ab4382d2SGreg Kroah-Hartman * Register a uart driver with the core driver. We in turn register 2497ab4382d2SGreg Kroah-Hartman * with the tty layer, and initialise the core driver per-port state. 2498ab4382d2SGreg Kroah-Hartman * 2499ab4382d2SGreg Kroah-Hartman * We have a proc file in /proc/tty/driver which is named after the 2500ab4382d2SGreg Kroah-Hartman * normal driver. 2501ab4382d2SGreg Kroah-Hartman * 2502ab4382d2SGreg Kroah-Hartman * drv->port should be NULL, and the per-port structures should be 2503ab4382d2SGreg Kroah-Hartman * registered using uart_add_one_port after this call has succeeded. 2504ab4382d2SGreg Kroah-Hartman */ 2505ab4382d2SGreg Kroah-Hartman int uart_register_driver(struct uart_driver *drv) 2506ab4382d2SGreg Kroah-Hartman { 2507ab4382d2SGreg Kroah-Hartman struct tty_driver *normal; 2508ab4382d2SGreg Kroah-Hartman int i, retval; 2509ab4382d2SGreg Kroah-Hartman 2510ab4382d2SGreg Kroah-Hartman BUG_ON(drv->state); 2511ab4382d2SGreg Kroah-Hartman 2512ab4382d2SGreg Kroah-Hartman /* 2513ab4382d2SGreg Kroah-Hartman * Maybe we should be using a slab cache for this, especially if 2514ab4382d2SGreg Kroah-Hartman * we have a large number of ports to handle. 2515ab4382d2SGreg Kroah-Hartman */ 25166396bb22SKees Cook drv->state = kcalloc(drv->nr, sizeof(struct uart_state), GFP_KERNEL); 2517ab4382d2SGreg Kroah-Hartman if (!drv->state) 2518ab4382d2SGreg Kroah-Hartman goto out; 2519ab4382d2SGreg Kroah-Hartman 2520ab4382d2SGreg Kroah-Hartman normal = alloc_tty_driver(drv->nr); 2521ab4382d2SGreg Kroah-Hartman if (!normal) 2522ab4382d2SGreg Kroah-Hartman goto out_kfree; 2523ab4382d2SGreg Kroah-Hartman 2524ab4382d2SGreg Kroah-Hartman drv->tty_driver = normal; 2525ab4382d2SGreg Kroah-Hartman 2526ab4382d2SGreg Kroah-Hartman normal->driver_name = drv->driver_name; 2527ab4382d2SGreg Kroah-Hartman normal->name = drv->dev_name; 2528ab4382d2SGreg Kroah-Hartman normal->major = drv->major; 2529ab4382d2SGreg Kroah-Hartman normal->minor_start = drv->minor; 2530ab4382d2SGreg Kroah-Hartman normal->type = TTY_DRIVER_TYPE_SERIAL; 2531ab4382d2SGreg Kroah-Hartman normal->subtype = SERIAL_TYPE_NORMAL; 2532ab4382d2SGreg Kroah-Hartman normal->init_termios = tty_std_termios; 2533ab4382d2SGreg Kroah-Hartman normal->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; 2534ab4382d2SGreg Kroah-Hartman normal->init_termios.c_ispeed = normal->init_termios.c_ospeed = 9600; 2535ab4382d2SGreg Kroah-Hartman normal->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; 2536ab4382d2SGreg Kroah-Hartman normal->driver_state = drv; 2537ab4382d2SGreg Kroah-Hartman tty_set_operations(normal, &uart_ops); 2538ab4382d2SGreg Kroah-Hartman 2539ab4382d2SGreg Kroah-Hartman /* 2540ab4382d2SGreg Kroah-Hartman * Initialise the UART state(s). 2541ab4382d2SGreg Kroah-Hartman */ 2542ab4382d2SGreg Kroah-Hartman for (i = 0; i < drv->nr; i++) { 2543ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + i; 2544ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2545ab4382d2SGreg Kroah-Hartman 2546ab4382d2SGreg Kroah-Hartman tty_port_init(port); 2547ab4382d2SGreg Kroah-Hartman port->ops = &uart_port_ops; 2548ab4382d2SGreg Kroah-Hartman } 2549ab4382d2SGreg Kroah-Hartman 2550ab4382d2SGreg Kroah-Hartman retval = tty_register_driver(normal); 2551ab4382d2SGreg Kroah-Hartman if (retval >= 0) 2552ab4382d2SGreg Kroah-Hartman return retval; 2553ab4382d2SGreg Kroah-Hartman 2554191c5f10SJiri Slaby for (i = 0; i < drv->nr; i++) 2555191c5f10SJiri Slaby tty_port_destroy(&drv->state[i].port); 2556ab4382d2SGreg Kroah-Hartman put_tty_driver(normal); 2557ab4382d2SGreg Kroah-Hartman out_kfree: 2558ab4382d2SGreg Kroah-Hartman kfree(drv->state); 2559ab4382d2SGreg Kroah-Hartman out: 2560ab4382d2SGreg Kroah-Hartman return -ENOMEM; 2561ab4382d2SGreg Kroah-Hartman } 2562ab4382d2SGreg Kroah-Hartman 2563ab4382d2SGreg Kroah-Hartman /** 2564ab4382d2SGreg Kroah-Hartman * uart_unregister_driver - remove a driver from the uart core layer 2565ab4382d2SGreg Kroah-Hartman * @drv: low level driver structure 2566ab4382d2SGreg Kroah-Hartman * 2567ab4382d2SGreg Kroah-Hartman * Remove all references to a driver from the core driver. The low 2568ab4382d2SGreg Kroah-Hartman * level driver must have removed all its ports via the 2569ab4382d2SGreg Kroah-Hartman * uart_remove_one_port() if it registered them with uart_add_one_port(). 2570ab4382d2SGreg Kroah-Hartman * (ie, drv->port == NULL) 2571ab4382d2SGreg Kroah-Hartman */ 2572ab4382d2SGreg Kroah-Hartman void uart_unregister_driver(struct uart_driver *drv) 2573ab4382d2SGreg Kroah-Hartman { 2574ab4382d2SGreg Kroah-Hartman struct tty_driver *p = drv->tty_driver; 2575191c5f10SJiri Slaby unsigned int i; 2576191c5f10SJiri Slaby 2577ab4382d2SGreg Kroah-Hartman tty_unregister_driver(p); 2578ab4382d2SGreg Kroah-Hartman put_tty_driver(p); 2579191c5f10SJiri Slaby for (i = 0; i < drv->nr; i++) 2580191c5f10SJiri Slaby tty_port_destroy(&drv->state[i].port); 2581ab4382d2SGreg Kroah-Hartman kfree(drv->state); 25821e66cdedSAlan Cox drv->state = NULL; 2583ab4382d2SGreg Kroah-Hartman drv->tty_driver = NULL; 2584ab4382d2SGreg Kroah-Hartman } 2585ab4382d2SGreg Kroah-Hartman 2586ab4382d2SGreg Kroah-Hartman struct tty_driver *uart_console_device(struct console *co, int *index) 2587ab4382d2SGreg Kroah-Hartman { 2588ab4382d2SGreg Kroah-Hartman struct uart_driver *p = co->data; 2589ab4382d2SGreg Kroah-Hartman *index = co->index; 2590ab4382d2SGreg Kroah-Hartman return p->tty_driver; 2591ab4382d2SGreg Kroah-Hartman } 2592ab4382d2SGreg Kroah-Hartman 25936915c0e4STomas Hlavacek static ssize_t uart_get_attr_uartclk(struct device *dev, 25946915c0e4STomas Hlavacek struct device_attribute *attr, char *buf) 25956915c0e4STomas Hlavacek { 2596bebe73e3SAlan Cox struct serial_struct tmp; 25976915c0e4STomas Hlavacek struct tty_port *port = dev_get_drvdata(dev); 2598b1b79916STomas Hlavacek 25999f109694SAlan Cox uart_get_info(port, &tmp); 2600bebe73e3SAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.baud_base * 16); 26016915c0e4STomas Hlavacek } 26026915c0e4STomas Hlavacek 2603373bac4cSAlan Cox static ssize_t uart_get_attr_type(struct device *dev, 2604373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2605373bac4cSAlan Cox { 2606373bac4cSAlan Cox struct serial_struct tmp; 2607373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2608373bac4cSAlan Cox 2609373bac4cSAlan Cox uart_get_info(port, &tmp); 2610373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.type); 2611373bac4cSAlan Cox } 2612373bac4cSAlan Cox static ssize_t uart_get_attr_line(struct device *dev, 2613373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2614373bac4cSAlan Cox { 2615373bac4cSAlan Cox struct serial_struct tmp; 2616373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2617373bac4cSAlan Cox 2618373bac4cSAlan Cox uart_get_info(port, &tmp); 2619373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.line); 2620373bac4cSAlan Cox } 2621373bac4cSAlan Cox 2622373bac4cSAlan Cox static ssize_t uart_get_attr_port(struct device *dev, 2623373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2624373bac4cSAlan Cox { 2625373bac4cSAlan Cox struct serial_struct tmp; 2626373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2627fd985e1dSAndrew Morton unsigned long ioaddr; 2628373bac4cSAlan Cox 2629373bac4cSAlan Cox uart_get_info(port, &tmp); 2630fd985e1dSAndrew Morton ioaddr = tmp.port; 2631fd985e1dSAndrew Morton if (HIGH_BITS_OFFSET) 2632fd985e1dSAndrew Morton ioaddr |= (unsigned long)tmp.port_high << HIGH_BITS_OFFSET; 2633fd985e1dSAndrew Morton return snprintf(buf, PAGE_SIZE, "0x%lX\n", ioaddr); 2634373bac4cSAlan Cox } 2635373bac4cSAlan Cox 2636373bac4cSAlan Cox static ssize_t uart_get_attr_irq(struct device *dev, 2637373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2638373bac4cSAlan Cox { 2639373bac4cSAlan Cox struct serial_struct tmp; 2640373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2641373bac4cSAlan Cox 2642373bac4cSAlan Cox uart_get_info(port, &tmp); 2643373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.irq); 2644373bac4cSAlan Cox } 2645373bac4cSAlan Cox 2646373bac4cSAlan Cox static ssize_t uart_get_attr_flags(struct device *dev, 2647373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2648373bac4cSAlan Cox { 2649373bac4cSAlan Cox struct serial_struct tmp; 2650373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2651373bac4cSAlan Cox 2652373bac4cSAlan Cox uart_get_info(port, &tmp); 2653373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "0x%X\n", tmp.flags); 2654373bac4cSAlan Cox } 2655373bac4cSAlan Cox 2656373bac4cSAlan Cox static ssize_t uart_get_attr_xmit_fifo_size(struct device *dev, 2657373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2658373bac4cSAlan Cox { 2659373bac4cSAlan Cox struct serial_struct tmp; 2660373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2661373bac4cSAlan Cox 2662373bac4cSAlan Cox uart_get_info(port, &tmp); 2663373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.xmit_fifo_size); 2664373bac4cSAlan Cox } 2665373bac4cSAlan Cox 2666373bac4cSAlan Cox 2667373bac4cSAlan Cox static ssize_t uart_get_attr_close_delay(struct device *dev, 2668373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2669373bac4cSAlan Cox { 2670373bac4cSAlan Cox struct serial_struct tmp; 2671373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2672373bac4cSAlan Cox 2673373bac4cSAlan Cox uart_get_info(port, &tmp); 2674373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.close_delay); 2675373bac4cSAlan Cox } 2676373bac4cSAlan Cox 2677373bac4cSAlan Cox 2678373bac4cSAlan Cox static ssize_t uart_get_attr_closing_wait(struct device *dev, 2679373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2680373bac4cSAlan Cox { 2681373bac4cSAlan Cox struct serial_struct tmp; 2682373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2683373bac4cSAlan Cox 2684373bac4cSAlan Cox uart_get_info(port, &tmp); 2685373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.closing_wait); 2686373bac4cSAlan Cox } 2687373bac4cSAlan Cox 2688373bac4cSAlan Cox static ssize_t uart_get_attr_custom_divisor(struct device *dev, 2689373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2690373bac4cSAlan Cox { 2691373bac4cSAlan Cox struct serial_struct tmp; 2692373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2693373bac4cSAlan Cox 2694373bac4cSAlan Cox uart_get_info(port, &tmp); 2695373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.custom_divisor); 2696373bac4cSAlan Cox } 2697373bac4cSAlan Cox 2698373bac4cSAlan Cox static ssize_t uart_get_attr_io_type(struct device *dev, 2699373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2700373bac4cSAlan Cox { 2701373bac4cSAlan Cox struct serial_struct tmp; 2702373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2703373bac4cSAlan Cox 2704373bac4cSAlan Cox uart_get_info(port, &tmp); 2705373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.io_type); 2706373bac4cSAlan Cox } 2707373bac4cSAlan Cox 2708373bac4cSAlan Cox static ssize_t uart_get_attr_iomem_base(struct device *dev, 2709373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2710373bac4cSAlan Cox { 2711373bac4cSAlan Cox struct serial_struct tmp; 2712373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2713373bac4cSAlan Cox 2714373bac4cSAlan Cox uart_get_info(port, &tmp); 2715373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "0x%lX\n", (unsigned long)tmp.iomem_base); 2716373bac4cSAlan Cox } 2717373bac4cSAlan Cox 2718373bac4cSAlan Cox static ssize_t uart_get_attr_iomem_reg_shift(struct device *dev, 2719373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2720373bac4cSAlan Cox { 2721373bac4cSAlan Cox struct serial_struct tmp; 2722373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2723373bac4cSAlan Cox 2724373bac4cSAlan Cox uart_get_info(port, &tmp); 2725373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.iomem_reg_shift); 2726373bac4cSAlan Cox } 2727373bac4cSAlan Cox 2728373bac4cSAlan Cox static DEVICE_ATTR(type, S_IRUSR | S_IRGRP, uart_get_attr_type, NULL); 2729373bac4cSAlan Cox static DEVICE_ATTR(line, S_IRUSR | S_IRGRP, uart_get_attr_line, NULL); 2730373bac4cSAlan Cox static DEVICE_ATTR(port, S_IRUSR | S_IRGRP, uart_get_attr_port, NULL); 2731373bac4cSAlan Cox static DEVICE_ATTR(irq, S_IRUSR | S_IRGRP, uart_get_attr_irq, NULL); 2732373bac4cSAlan Cox static DEVICE_ATTR(flags, S_IRUSR | S_IRGRP, uart_get_attr_flags, NULL); 2733373bac4cSAlan Cox static DEVICE_ATTR(xmit_fifo_size, S_IRUSR | S_IRGRP, uart_get_attr_xmit_fifo_size, NULL); 27346915c0e4STomas Hlavacek static DEVICE_ATTR(uartclk, S_IRUSR | S_IRGRP, uart_get_attr_uartclk, NULL); 2735373bac4cSAlan Cox static DEVICE_ATTR(close_delay, S_IRUSR | S_IRGRP, uart_get_attr_close_delay, NULL); 2736373bac4cSAlan Cox static DEVICE_ATTR(closing_wait, S_IRUSR | S_IRGRP, uart_get_attr_closing_wait, NULL); 2737373bac4cSAlan Cox static DEVICE_ATTR(custom_divisor, S_IRUSR | S_IRGRP, uart_get_attr_custom_divisor, NULL); 2738373bac4cSAlan Cox static DEVICE_ATTR(io_type, S_IRUSR | S_IRGRP, uart_get_attr_io_type, NULL); 2739373bac4cSAlan Cox static DEVICE_ATTR(iomem_base, S_IRUSR | S_IRGRP, uart_get_attr_iomem_base, NULL); 2740373bac4cSAlan Cox static DEVICE_ATTR(iomem_reg_shift, S_IRUSR | S_IRGRP, uart_get_attr_iomem_reg_shift, NULL); 27416915c0e4STomas Hlavacek 27426915c0e4STomas Hlavacek static struct attribute *tty_dev_attrs[] = { 2743373bac4cSAlan Cox &dev_attr_type.attr, 2744373bac4cSAlan Cox &dev_attr_line.attr, 2745373bac4cSAlan Cox &dev_attr_port.attr, 2746373bac4cSAlan Cox &dev_attr_irq.attr, 2747373bac4cSAlan Cox &dev_attr_flags.attr, 2748373bac4cSAlan Cox &dev_attr_xmit_fifo_size.attr, 27496915c0e4STomas Hlavacek &dev_attr_uartclk.attr, 2750373bac4cSAlan Cox &dev_attr_close_delay.attr, 2751373bac4cSAlan Cox &dev_attr_closing_wait.attr, 2752373bac4cSAlan Cox &dev_attr_custom_divisor.attr, 2753373bac4cSAlan Cox &dev_attr_io_type.attr, 2754373bac4cSAlan Cox &dev_attr_iomem_base.attr, 2755373bac4cSAlan Cox &dev_attr_iomem_reg_shift.attr, 27566915c0e4STomas Hlavacek NULL, 27576915c0e4STomas Hlavacek }; 27586915c0e4STomas Hlavacek 2759b1b79916STomas Hlavacek static const struct attribute_group tty_dev_attr_group = { 27606915c0e4STomas Hlavacek .attrs = tty_dev_attrs, 27616915c0e4STomas Hlavacek }; 27626915c0e4STomas Hlavacek 2763ab4382d2SGreg Kroah-Hartman /** 2764ab4382d2SGreg Kroah-Hartman * uart_add_one_port - attach a driver-defined port structure 2765ab4382d2SGreg Kroah-Hartman * @drv: pointer to the uart low level driver structure for this port 2766ab4382d2SGreg Kroah-Hartman * @uport: uart port structure to use for this port. 2767ab4382d2SGreg Kroah-Hartman * 2768ab4382d2SGreg Kroah-Hartman * This allows the driver to register its own uart_port structure 2769ab4382d2SGreg Kroah-Hartman * with the core driver. The main purpose is to allow the low 2770ab4382d2SGreg Kroah-Hartman * level uart drivers to expand uart_port, rather than having yet 2771ab4382d2SGreg Kroah-Hartman * more levels of structures. 2772ab4382d2SGreg Kroah-Hartman */ 2773ab4382d2SGreg Kroah-Hartman int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport) 2774ab4382d2SGreg Kroah-Hartman { 2775ab4382d2SGreg Kroah-Hartman struct uart_state *state; 2776ab4382d2SGreg Kroah-Hartman struct tty_port *port; 2777ab4382d2SGreg Kroah-Hartman int ret = 0; 2778ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 2779266dcff0SGreg Kroah-Hartman int num_groups; 2780ab4382d2SGreg Kroah-Hartman 2781ab4382d2SGreg Kroah-Hartman BUG_ON(in_interrupt()); 2782ab4382d2SGreg Kroah-Hartman 2783ab4382d2SGreg Kroah-Hartman if (uport->line >= drv->nr) 2784ab4382d2SGreg Kroah-Hartman return -EINVAL; 2785ab4382d2SGreg Kroah-Hartman 2786ab4382d2SGreg Kroah-Hartman state = drv->state + uport->line; 2787ab4382d2SGreg Kroah-Hartman port = &state->port; 2788ab4382d2SGreg Kroah-Hartman 2789ab4382d2SGreg Kroah-Hartman mutex_lock(&port_mutex); 2790ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2791ab4382d2SGreg Kroah-Hartman if (state->uart_port) { 2792ab4382d2SGreg Kroah-Hartman ret = -EINVAL; 2793ab4382d2SGreg Kroah-Hartman goto out; 2794ab4382d2SGreg Kroah-Hartman } 2795ab4382d2SGreg Kroah-Hartman 27962b702b9bSPeter Hurley /* Link the port to the driver state table and vice versa */ 27979ed19428SPeter Hurley atomic_set(&state->refcount, 1); 27989ed19428SPeter Hurley init_waitqueue_head(&state->remove_wait); 2799ab4382d2SGreg Kroah-Hartman state->uart_port = uport; 2800ab4382d2SGreg Kroah-Hartman uport->state = state; 2801ab4382d2SGreg Kroah-Hartman 28022b702b9bSPeter Hurley state->pm_state = UART_PM_STATE_UNDEFINED; 28032b702b9bSPeter Hurley uport->cons = drv->cons; 2804959801feSPeter Hurley uport->minor = drv->tty_driver->minor_start + uport->line; 2805f7048b15SVignesh R uport->name = kasprintf(GFP_KERNEL, "%s%d", drv->dev_name, 2806f7048b15SVignesh R drv->tty_driver->name_base + uport->line); 2807f7048b15SVignesh R if (!uport->name) { 2808f7048b15SVignesh R ret = -ENOMEM; 2809f7048b15SVignesh R goto out; 2810f7048b15SVignesh R } 28112b702b9bSPeter Hurley 2812ab4382d2SGreg Kroah-Hartman /* 2813ab4382d2SGreg Kroah-Hartman * If this port is a console, then the spinlock is already 2814ab4382d2SGreg Kroah-Hartman * initialised. 2815ab4382d2SGreg Kroah-Hartman */ 2816ab4382d2SGreg Kroah-Hartman if (!(uart_console(uport) && (uport->cons->flags & CON_ENABLED))) { 2817ab4382d2SGreg Kroah-Hartman spin_lock_init(&uport->lock); 2818ab4382d2SGreg Kroah-Hartman lockdep_set_class(&uport->lock, &port_lock_key); 2819ab4382d2SGreg Kroah-Hartman } 2820a208ffd2SGrant Likely if (uport->cons && uport->dev) 2821a208ffd2SGrant Likely of_console_check(uport->dev->of_node, uport->cons->name, uport->line); 2822ab4382d2SGreg Kroah-Hartman 2823ab4382d2SGreg Kroah-Hartman uart_configure_port(drv, state, uport); 2824ab4382d2SGreg Kroah-Hartman 28254dda864dSGeert Uytterhoeven port->console = uart_console(uport); 28264dda864dSGeert Uytterhoeven 2827266dcff0SGreg Kroah-Hartman num_groups = 2; 2828266dcff0SGreg Kroah-Hartman if (uport->attr_group) 2829266dcff0SGreg Kroah-Hartman num_groups++; 2830266dcff0SGreg Kroah-Hartman 2831c2b703b8SYoshihiro YUNOMAE uport->tty_groups = kcalloc(num_groups, sizeof(*uport->tty_groups), 2832266dcff0SGreg Kroah-Hartman GFP_KERNEL); 2833266dcff0SGreg Kroah-Hartman if (!uport->tty_groups) { 2834266dcff0SGreg Kroah-Hartman ret = -ENOMEM; 2835266dcff0SGreg Kroah-Hartman goto out; 2836266dcff0SGreg Kroah-Hartman } 2837266dcff0SGreg Kroah-Hartman uport->tty_groups[0] = &tty_dev_attr_group; 2838266dcff0SGreg Kroah-Hartman if (uport->attr_group) 2839266dcff0SGreg Kroah-Hartman uport->tty_groups[1] = uport->attr_group; 2840266dcff0SGreg Kroah-Hartman 2841ab4382d2SGreg Kroah-Hartman /* 2842ab4382d2SGreg Kroah-Hartman * Register the port whether it's detected or not. This allows 2843015355b7SGeert Uytterhoeven * setserial to be used to alter this port's parameters. 2844ab4382d2SGreg Kroah-Hartman */ 2845da4c2799SJohan Hovold tty_dev = tty_port_register_device_attr_serdev(port, drv->tty_driver, 2846266dcff0SGreg Kroah-Hartman uport->line, uport->dev, port, uport->tty_groups); 2847b289c496SChengguang Xu if (!IS_ERR(tty_dev)) { 284877359835SSimon Glass device_set_wakeup_capable(tty_dev, 1); 284977359835SSimon Glass } else { 28502f2dafe7SSudip Mukherjee dev_err(uport->dev, "Cannot register tty device on line %d\n", 2851ab4382d2SGreg Kroah-Hartman uport->line); 285277359835SSimon Glass } 2853ab4382d2SGreg Kroah-Hartman 2854ab4382d2SGreg Kroah-Hartman /* 2855ab4382d2SGreg Kroah-Hartman * Ensure UPF_DEAD is not set. 2856ab4382d2SGreg Kroah-Hartman */ 2857ab4382d2SGreg Kroah-Hartman uport->flags &= ~UPF_DEAD; 2858ab4382d2SGreg Kroah-Hartman 2859ab4382d2SGreg Kroah-Hartman out: 2860ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2861ab4382d2SGreg Kroah-Hartman mutex_unlock(&port_mutex); 2862ab4382d2SGreg Kroah-Hartman 2863ab4382d2SGreg Kroah-Hartman return ret; 2864ab4382d2SGreg Kroah-Hartman } 2865ab4382d2SGreg Kroah-Hartman 2866ab4382d2SGreg Kroah-Hartman /** 2867ab4382d2SGreg Kroah-Hartman * uart_remove_one_port - detach a driver defined port structure 2868ab4382d2SGreg Kroah-Hartman * @drv: pointer to the uart low level driver structure for this port 2869ab4382d2SGreg Kroah-Hartman * @uport: uart port structure for this port 2870ab4382d2SGreg Kroah-Hartman * 2871ab4382d2SGreg Kroah-Hartman * This unhooks (and hangs up) the specified port structure from the 2872ab4382d2SGreg Kroah-Hartman * core driver. No further calls will be made to the low-level code 2873ab4382d2SGreg Kroah-Hartman * for this port. 2874ab4382d2SGreg Kroah-Hartman */ 2875ab4382d2SGreg Kroah-Hartman int uart_remove_one_port(struct uart_driver *drv, struct uart_port *uport) 2876ab4382d2SGreg Kroah-Hartman { 2877ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 2878ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 28794047b371SPeter Hurley struct uart_port *uart_port; 28804c6d5b4dSGeert Uytterhoeven struct tty_struct *tty; 2881b342dd51SChen Gang int ret = 0; 2882ab4382d2SGreg Kroah-Hartman 2883ab4382d2SGreg Kroah-Hartman BUG_ON(in_interrupt()); 2884ab4382d2SGreg Kroah-Hartman 2885ab4382d2SGreg Kroah-Hartman mutex_lock(&port_mutex); 2886ab4382d2SGreg Kroah-Hartman 2887ab4382d2SGreg Kroah-Hartman /* 2888ab4382d2SGreg Kroah-Hartman * Mark the port "dead" - this prevents any opens from 2889ab4382d2SGreg Kroah-Hartman * succeeding while we shut down the port. 2890ab4382d2SGreg Kroah-Hartman */ 2891ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 28924047b371SPeter Hurley uart_port = uart_port_check(state); 28934047b371SPeter Hurley if (uart_port != uport) 28944047b371SPeter Hurley dev_alert(uport->dev, "Removing wrong port: %p != %p\n", 28954047b371SPeter Hurley uart_port, uport); 28964047b371SPeter Hurley 28974047b371SPeter Hurley if (!uart_port) { 2898b342dd51SChen Gang mutex_unlock(&port->mutex); 2899b342dd51SChen Gang ret = -EINVAL; 2900b342dd51SChen Gang goto out; 2901b342dd51SChen Gang } 2902ab4382d2SGreg Kroah-Hartman uport->flags |= UPF_DEAD; 2903ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2904ab4382d2SGreg Kroah-Hartman 2905ab4382d2SGreg Kroah-Hartman /* 2906ab4382d2SGreg Kroah-Hartman * Remove the devices from the tty layer 2907ab4382d2SGreg Kroah-Hartman */ 2908da4c2799SJohan Hovold tty_port_unregister_device(port, drv->tty_driver, uport->line); 2909ab4382d2SGreg Kroah-Hartman 29104c6d5b4dSGeert Uytterhoeven tty = tty_port_tty_get(port); 29114c6d5b4dSGeert Uytterhoeven if (tty) { 2912ab4382d2SGreg Kroah-Hartman tty_vhangup(port->tty); 29134c6d5b4dSGeert Uytterhoeven tty_kref_put(tty); 29144c6d5b4dSGeert Uytterhoeven } 2915ab4382d2SGreg Kroah-Hartman 2916ab4382d2SGreg Kroah-Hartman /* 29175f5c9ae5SGeert Uytterhoeven * If the port is used as a console, unregister it 29185f5c9ae5SGeert Uytterhoeven */ 29195f5c9ae5SGeert Uytterhoeven if (uart_console(uport)) 29205f5c9ae5SGeert Uytterhoeven unregister_console(uport->cons); 29215f5c9ae5SGeert Uytterhoeven 29225f5c9ae5SGeert Uytterhoeven /* 2923ab4382d2SGreg Kroah-Hartman * Free the port IO and memory resources, if any. 2924ab4382d2SGreg Kroah-Hartman */ 2925a7cfaf16SFabio Estevam if (uport->type != PORT_UNKNOWN && uport->ops->release_port) 2926ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 2927266dcff0SGreg Kroah-Hartman kfree(uport->tty_groups); 2928f7048b15SVignesh R kfree(uport->name); 2929ab4382d2SGreg Kroah-Hartman 2930ab4382d2SGreg Kroah-Hartman /* 2931ab4382d2SGreg Kroah-Hartman * Indicate that there isn't a port here anymore. 2932ab4382d2SGreg Kroah-Hartman */ 2933ab4382d2SGreg Kroah-Hartman uport->type = PORT_UNKNOWN; 2934ab4382d2SGreg Kroah-Hartman 29354047b371SPeter Hurley mutex_lock(&port->mutex); 29369ed19428SPeter Hurley WARN_ON(atomic_dec_return(&state->refcount) < 0); 29379ed19428SPeter Hurley wait_event(state->remove_wait, !atomic_read(&state->refcount)); 2938ab4382d2SGreg Kroah-Hartman state->uart_port = NULL; 29394047b371SPeter Hurley mutex_unlock(&port->mutex); 2940b342dd51SChen Gang out: 2941ab4382d2SGreg Kroah-Hartman mutex_unlock(&port_mutex); 2942ab4382d2SGreg Kroah-Hartman 2943b342dd51SChen Gang return ret; 2944ab4382d2SGreg Kroah-Hartman } 2945ab4382d2SGreg Kroah-Hartman 2946ab4382d2SGreg Kroah-Hartman /* 2947ab4382d2SGreg Kroah-Hartman * Are the two ports equivalent? 2948ab4382d2SGreg Kroah-Hartman */ 2949ab4382d2SGreg Kroah-Hartman int uart_match_port(struct uart_port *port1, struct uart_port *port2) 2950ab4382d2SGreg Kroah-Hartman { 2951ab4382d2SGreg Kroah-Hartman if (port1->iotype != port2->iotype) 2952ab4382d2SGreg Kroah-Hartman return 0; 2953ab4382d2SGreg Kroah-Hartman 2954ab4382d2SGreg Kroah-Hartman switch (port1->iotype) { 2955ab4382d2SGreg Kroah-Hartman case UPIO_PORT: 2956ab4382d2SGreg Kroah-Hartman return (port1->iobase == port2->iobase); 2957ab4382d2SGreg Kroah-Hartman case UPIO_HUB6: 2958ab4382d2SGreg Kroah-Hartman return (port1->iobase == port2->iobase) && 2959ab4382d2SGreg Kroah-Hartman (port1->hub6 == port2->hub6); 2960ab4382d2SGreg Kroah-Hartman case UPIO_MEM: 2961bd94c407SMasahiro Yamada case UPIO_MEM16: 2962ab4382d2SGreg Kroah-Hartman case UPIO_MEM32: 29633ffb1a81SKevin Cernekee case UPIO_MEM32BE: 2964ab4382d2SGreg Kroah-Hartman case UPIO_AU: 2965ab4382d2SGreg Kroah-Hartman case UPIO_TSI: 2966ab4382d2SGreg Kroah-Hartman return (port1->mapbase == port2->mapbase); 2967ab4382d2SGreg Kroah-Hartman } 2968ab4382d2SGreg Kroah-Hartman return 0; 2969ab4382d2SGreg Kroah-Hartman } 2970ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_match_port); 2971ab4382d2SGreg Kroah-Hartman 2972027d7dacSJiri Slaby /** 2973027d7dacSJiri Slaby * uart_handle_dcd_change - handle a change of carrier detect state 2974027d7dacSJiri Slaby * @uport: uart_port structure for the open port 2975027d7dacSJiri Slaby * @status: new carrier detect status, nonzero if active 29764d90bb14SPeter Hurley * 29774d90bb14SPeter Hurley * Caller must hold uport->lock 2978027d7dacSJiri Slaby */ 2979027d7dacSJiri Slaby void uart_handle_dcd_change(struct uart_port *uport, unsigned int status) 2980027d7dacSJiri Slaby { 298142381572SGeorge Spelvin struct tty_port *port = &uport->state->port; 298243eca0aeSAlan Cox struct tty_struct *tty = port->tty; 2983c993257bSPeter Hurley struct tty_ldisc *ld; 2984027d7dacSJiri Slaby 29854d90bb14SPeter Hurley lockdep_assert_held_once(&uport->lock); 29864d90bb14SPeter Hurley 2987c993257bSPeter Hurley if (tty) { 2988c993257bSPeter Hurley ld = tty_ldisc_ref(tty); 298942381572SGeorge Spelvin if (ld) { 299042381572SGeorge Spelvin if (ld->ops->dcd_change) 2991593fb1aeSGeorge Spelvin ld->ops->dcd_change(tty, status); 299242381572SGeorge Spelvin tty_ldisc_deref(ld); 299342381572SGeorge Spelvin } 2994c993257bSPeter Hurley } 2995027d7dacSJiri Slaby 2996027d7dacSJiri Slaby uport->icount.dcd++; 2997027d7dacSJiri Slaby 2998299245a1SPeter Hurley if (uart_dcd_enabled(uport)) { 2999027d7dacSJiri Slaby if (status) 3000027d7dacSJiri Slaby wake_up_interruptible(&port->open_wait); 300143eca0aeSAlan Cox else if (tty) 300243eca0aeSAlan Cox tty_hangup(tty); 3003027d7dacSJiri Slaby } 3004027d7dacSJiri Slaby } 3005027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_handle_dcd_change); 3006027d7dacSJiri Slaby 3007027d7dacSJiri Slaby /** 3008027d7dacSJiri Slaby * uart_handle_cts_change - handle a change of clear-to-send state 3009027d7dacSJiri Slaby * @uport: uart_port structure for the open port 3010027d7dacSJiri Slaby * @status: new clear to send status, nonzero if active 30114d90bb14SPeter Hurley * 30124d90bb14SPeter Hurley * Caller must hold uport->lock 3013027d7dacSJiri Slaby */ 3014027d7dacSJiri Slaby void uart_handle_cts_change(struct uart_port *uport, unsigned int status) 3015027d7dacSJiri Slaby { 30164d90bb14SPeter Hurley lockdep_assert_held_once(&uport->lock); 30174d90bb14SPeter Hurley 3018027d7dacSJiri Slaby uport->icount.cts++; 3019027d7dacSJiri Slaby 3020391f93f2SPeter Hurley if (uart_softcts_mode(uport)) { 3021d01f4d18SPeter Hurley if (uport->hw_stopped) { 3022027d7dacSJiri Slaby if (status) { 3023d01f4d18SPeter Hurley uport->hw_stopped = 0; 3024027d7dacSJiri Slaby uport->ops->start_tx(uport); 3025027d7dacSJiri Slaby uart_write_wakeup(uport); 3026027d7dacSJiri Slaby } 3027027d7dacSJiri Slaby } else { 3028027d7dacSJiri Slaby if (!status) { 3029d01f4d18SPeter Hurley uport->hw_stopped = 1; 3030027d7dacSJiri Slaby uport->ops->stop_tx(uport); 3031027d7dacSJiri Slaby } 3032027d7dacSJiri Slaby } 3033391f93f2SPeter Hurley 3034027d7dacSJiri Slaby } 3035027d7dacSJiri Slaby } 3036027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_handle_cts_change); 3037027d7dacSJiri Slaby 3038cf75525fSJiri Slaby /** 3039cf75525fSJiri Slaby * uart_insert_char - push a char to the uart layer 3040cf75525fSJiri Slaby * 3041cf75525fSJiri Slaby * User is responsible to call tty_flip_buffer_push when they are done with 3042cf75525fSJiri Slaby * insertion. 3043cf75525fSJiri Slaby * 3044cf75525fSJiri Slaby * @port: corresponding port 3045cf75525fSJiri Slaby * @status: state of the serial port RX buffer (LSR for 8250) 3046cf75525fSJiri Slaby * @overrun: mask of overrun bits in @status 3047cf75525fSJiri Slaby * @ch: character to push 3048cf75525fSJiri Slaby * @flag: flag for the character (see TTY_NORMAL and friends) 3049cf75525fSJiri Slaby */ 3050027d7dacSJiri Slaby void uart_insert_char(struct uart_port *port, unsigned int status, 3051027d7dacSJiri Slaby unsigned int overrun, unsigned int ch, unsigned int flag) 3052027d7dacSJiri Slaby { 305392a19f9cSJiri Slaby struct tty_port *tport = &port->state->port; 3054027d7dacSJiri Slaby 3055027d7dacSJiri Slaby if ((status & port->ignore_status_mask & ~overrun) == 0) 305692a19f9cSJiri Slaby if (tty_insert_flip_char(tport, ch, flag) == 0) 3057dabfb351SCorbin ++port->icount.buf_overrun; 3058027d7dacSJiri Slaby 3059027d7dacSJiri Slaby /* 3060027d7dacSJiri Slaby * Overrun is special. Since it's reported immediately, 3061027d7dacSJiri Slaby * it doesn't affect the current character. 3062027d7dacSJiri Slaby */ 3063027d7dacSJiri Slaby if (status & ~port->ignore_status_mask & overrun) 306492a19f9cSJiri Slaby if (tty_insert_flip_char(tport, 0, TTY_OVERRUN) == 0) 3065dabfb351SCorbin ++port->icount.buf_overrun; 3066027d7dacSJiri Slaby } 3067027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_insert_char); 3068027d7dacSJiri Slaby 3069ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_write_wakeup); 3070ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_register_driver); 3071ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_unregister_driver); 3072ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_suspend_port); 3073ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_resume_port); 3074ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_add_one_port); 3075ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_remove_one_port); 3076ab4382d2SGreg Kroah-Hartman 3077ef838a81SUwe Kleine-König /** 3078743f93f8SLukas Wunner * uart_get_rs485_mode() - retrieve rs485 properties for given uart 3079743f93f8SLukas Wunner * @dev: uart device 3080ef838a81SUwe Kleine-König * @rs485conf: output parameter 3081ef838a81SUwe Kleine-König * 3082ef838a81SUwe Kleine-König * This function implements the device tree binding described in 3083ef838a81SUwe Kleine-König * Documentation/devicetree/bindings/serial/rs485.txt. 3084ef838a81SUwe Kleine-König */ 3085743f93f8SLukas Wunner void uart_get_rs485_mode(struct device *dev, struct serial_rs485 *rs485conf) 3086ef838a81SUwe Kleine-König { 3087ef838a81SUwe Kleine-König u32 rs485_delay[2]; 3088ef838a81SUwe Kleine-König int ret; 3089ef838a81SUwe Kleine-König 3090743f93f8SLukas Wunner ret = device_property_read_u32_array(dev, "rs485-rts-delay", 3091743f93f8SLukas Wunner rs485_delay, 2); 3092ef838a81SUwe Kleine-König if (!ret) { 3093ef838a81SUwe Kleine-König rs485conf->delay_rts_before_send = rs485_delay[0]; 3094ef838a81SUwe Kleine-König rs485conf->delay_rts_after_send = rs485_delay[1]; 3095ef838a81SUwe Kleine-König } else { 3096ef838a81SUwe Kleine-König rs485conf->delay_rts_before_send = 0; 3097ef838a81SUwe Kleine-König rs485conf->delay_rts_after_send = 0; 3098ef838a81SUwe Kleine-König } 3099ef838a81SUwe Kleine-König 3100ef838a81SUwe Kleine-König /* 3101f1e5b618SLukas Wunner * Clear full-duplex and enabled flags, set RTS polarity to active high 3102f1e5b618SLukas Wunner * to get to a defined state with the following properties: 3103ef838a81SUwe Kleine-König */ 3104f1e5b618SLukas Wunner rs485conf->flags &= ~(SER_RS485_RX_DURING_TX | SER_RS485_ENABLED | 3105f1e5b618SLukas Wunner SER_RS485_RTS_AFTER_SEND); 3106f1e5b618SLukas Wunner rs485conf->flags |= SER_RS485_RTS_ON_SEND; 3107ef838a81SUwe Kleine-König 3108743f93f8SLukas Wunner if (device_property_read_bool(dev, "rs485-rx-during-tx")) 3109ef838a81SUwe Kleine-König rs485conf->flags |= SER_RS485_RX_DURING_TX; 3110ef838a81SUwe Kleine-König 3111743f93f8SLukas Wunner if (device_property_read_bool(dev, "linux,rs485-enabled-at-boot-time")) 3112ef838a81SUwe Kleine-König rs485conf->flags |= SER_RS485_ENABLED; 3113f1e5b618SLukas Wunner 3114f1e5b618SLukas Wunner if (device_property_read_bool(dev, "rs485-rts-active-low")) { 3115f1e5b618SLukas Wunner rs485conf->flags &= ~SER_RS485_RTS_ON_SEND; 3116f1e5b618SLukas Wunner rs485conf->flags |= SER_RS485_RTS_AFTER_SEND; 3117f1e5b618SLukas Wunner } 3118ef838a81SUwe Kleine-König } 3119743f93f8SLukas Wunner EXPORT_SYMBOL_GPL(uart_get_rs485_mode); 3120ef838a81SUwe Kleine-König 3121ab4382d2SGreg Kroah-Hartman MODULE_DESCRIPTION("Serial driver core"); 3122ab4382d2SGreg Kroah-Hartman MODULE_LICENSE("GPL"); 3123