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> 2368af4317SDmitry Safonov #include <linux/sysrq.h> 24ab4382d2SGreg Kroah-Hartman #include <linux/delay.h> 25ab4382d2SGreg Kroah-Hartman #include <linux/mutex.h> 26794edf30SDavid Howells #include <linux/security.h> 27ab4382d2SGreg Kroah-Hartman 28aef3ad10SAndy Shevchenko #include <linux/irq.h> 297c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 30ab4382d2SGreg Kroah-Hartman 31ab4382d2SGreg Kroah-Hartman /* 32ab4382d2SGreg Kroah-Hartman * This is used to lock changes in serial line configuration. 33ab4382d2SGreg Kroah-Hartman */ 34ab4382d2SGreg Kroah-Hartman static DEFINE_MUTEX(port_mutex); 35ab4382d2SGreg Kroah-Hartman 36ab4382d2SGreg Kroah-Hartman /* 37ab4382d2SGreg Kroah-Hartman * lockdep: port->lock is initialized in two places, but we 38ab4382d2SGreg Kroah-Hartman * want only one lock-class: 39ab4382d2SGreg Kroah-Hartman */ 40ab4382d2SGreg Kroah-Hartman static struct lock_class_key port_lock_key; 41ab4382d2SGreg Kroah-Hartman 42ab4382d2SGreg Kroah-Hartman #define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8) 43ab4382d2SGreg Kroah-Hartman 4468af4317SDmitry Safonov #define SYSRQ_TIMEOUT (HZ * 5) 4568af4317SDmitry Safonov 46ab4382d2SGreg Kroah-Hartman static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, 47ab4382d2SGreg Kroah-Hartman struct ktermios *old_termios); 481f33a51dSJiri Slaby static void uart_wait_until_sent(struct tty_struct *tty, int timeout); 496f538fe3SLinus Walleij static void uart_change_pm(struct uart_state *state, 506f538fe3SLinus Walleij enum uart_pm_state pm_state); 51ab4382d2SGreg Kroah-Hartman 52b922e19dSJiri Slaby static void uart_port_shutdown(struct tty_port *port); 53b922e19dSJiri Slaby 54299245a1SPeter Hurley static int uart_dcd_enabled(struct uart_port *uport) 55299245a1SPeter Hurley { 56d4260b51SPeter Hurley return !!(uport->status & UPSTAT_DCD_ENABLE); 57299245a1SPeter Hurley } 58299245a1SPeter Hurley 599ed19428SPeter Hurley static inline struct uart_port *uart_port_ref(struct uart_state *state) 609ed19428SPeter Hurley { 619ed19428SPeter Hurley if (atomic_add_unless(&state->refcount, 1, 0)) 629ed19428SPeter Hurley return state->uart_port; 639ed19428SPeter Hurley return NULL; 649ed19428SPeter Hurley } 659ed19428SPeter Hurley 669ed19428SPeter Hurley static inline void uart_port_deref(struct uart_port *uport) 679ed19428SPeter Hurley { 68ef510beaSAndy Shevchenko if (atomic_dec_and_test(&uport->state->refcount)) 699ed19428SPeter Hurley wake_up(&uport->state->remove_wait); 709ed19428SPeter Hurley } 719ed19428SPeter Hurley 729ed19428SPeter Hurley #define uart_port_lock(state, flags) \ 739ed19428SPeter Hurley ({ \ 749ed19428SPeter Hurley struct uart_port *__uport = uart_port_ref(state); \ 759ed19428SPeter Hurley if (__uport) \ 769ed19428SPeter Hurley spin_lock_irqsave(&__uport->lock, flags); \ 779ed19428SPeter Hurley __uport; \ 789ed19428SPeter Hurley }) 799ed19428SPeter Hurley 809ed19428SPeter Hurley #define uart_port_unlock(uport, flags) \ 819ed19428SPeter Hurley ({ \ 829ed19428SPeter Hurley struct uart_port *__uport = uport; \ 83ef510beaSAndy Shevchenko if (__uport) { \ 849ed19428SPeter Hurley spin_unlock_irqrestore(&__uport->lock, flags); \ 859ed19428SPeter Hurley uart_port_deref(__uport); \ 86ef510beaSAndy Shevchenko } \ 879ed19428SPeter Hurley }) 889ed19428SPeter Hurley 894047b371SPeter Hurley static inline struct uart_port *uart_port_check(struct uart_state *state) 904047b371SPeter Hurley { 917da4b8b7SPeter Hurley lockdep_assert_held(&state->port.mutex); 924047b371SPeter Hurley return state->uart_port; 934047b371SPeter Hurley } 944047b371SPeter Hurley 95ab4382d2SGreg Kroah-Hartman /* 96ab4382d2SGreg Kroah-Hartman * This routine is used by the interrupt handler to schedule processing in 97ab4382d2SGreg Kroah-Hartman * the software interrupt portion of the driver. 98ab4382d2SGreg Kroah-Hartman */ 99ab4382d2SGreg Kroah-Hartman void uart_write_wakeup(struct uart_port *port) 100ab4382d2SGreg Kroah-Hartman { 101ab4382d2SGreg Kroah-Hartman struct uart_state *state = port->state; 102ab4382d2SGreg Kroah-Hartman /* 103ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 104ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 105ab4382d2SGreg Kroah-Hartman */ 106ab4382d2SGreg Kroah-Hartman BUG_ON(!state); 107d0f4bce2SRob Herring tty_port_tty_wakeup(&state->port); 108ab4382d2SGreg Kroah-Hartman } 109ab4382d2SGreg Kroah-Hartman 110ab4382d2SGreg Kroah-Hartman static void uart_stop(struct tty_struct *tty) 111ab4382d2SGreg Kroah-Hartman { 112ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1139ed19428SPeter Hurley struct uart_port *port; 114ab4382d2SGreg Kroah-Hartman unsigned long flags; 115ab4382d2SGreg Kroah-Hartman 1169ed19428SPeter Hurley port = uart_port_lock(state, flags); 1179ed19428SPeter Hurley if (port) 118ab4382d2SGreg Kroah-Hartman port->ops->stop_tx(port); 1199ed19428SPeter Hurley uart_port_unlock(port, flags); 120ab4382d2SGreg Kroah-Hartman } 121ab4382d2SGreg Kroah-Hartman 122ab4382d2SGreg Kroah-Hartman static void __uart_start(struct tty_struct *tty) 123ab4382d2SGreg Kroah-Hartman { 124ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 125ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 126ab4382d2SGreg Kroah-Hartman 1279ed19428SPeter Hurley if (port && !uart_tx_stopped(port)) 128ab4382d2SGreg Kroah-Hartman port->ops->start_tx(port); 129ab4382d2SGreg Kroah-Hartman } 130ab4382d2SGreg Kroah-Hartman 131ab4382d2SGreg Kroah-Hartman static void uart_start(struct tty_struct *tty) 132ab4382d2SGreg Kroah-Hartman { 133ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1349ed19428SPeter Hurley struct uart_port *port; 135ab4382d2SGreg Kroah-Hartman unsigned long flags; 136ab4382d2SGreg Kroah-Hartman 1379ed19428SPeter Hurley port = uart_port_lock(state, flags); 138ab4382d2SGreg Kroah-Hartman __uart_start(tty); 1399ed19428SPeter Hurley uart_port_unlock(port, flags); 140ab4382d2SGreg Kroah-Hartman } 141ab4382d2SGreg Kroah-Hartman 142f4581cabSDenys Vlasenko static void 143ab4382d2SGreg Kroah-Hartman uart_update_mctrl(struct uart_port *port, unsigned int set, unsigned int clear) 144ab4382d2SGreg Kroah-Hartman { 145ab4382d2SGreg Kroah-Hartman unsigned long flags; 146ab4382d2SGreg Kroah-Hartman unsigned int old; 147ab4382d2SGreg Kroah-Hartman 148ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 149ab4382d2SGreg Kroah-Hartman old = port->mctrl; 150ab4382d2SGreg Kroah-Hartman port->mctrl = (old & ~clear) | set; 151ab4382d2SGreg Kroah-Hartman if (old != port->mctrl) 152ab4382d2SGreg Kroah-Hartman port->ops->set_mctrl(port, port->mctrl); 153ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 154ab4382d2SGreg Kroah-Hartman } 155ab4382d2SGreg Kroah-Hartman 156ab4382d2SGreg Kroah-Hartman #define uart_set_mctrl(port, set) uart_update_mctrl(port, set, 0) 157ab4382d2SGreg Kroah-Hartman #define uart_clear_mctrl(port, clear) uart_update_mctrl(port, 0, clear) 158ab4382d2SGreg Kroah-Hartman 159a6845e1eSRafael Gago static void uart_port_dtr_rts(struct uart_port *uport, int raise) 160a6845e1eSRafael Gago { 161a6845e1eSRafael Gago int rs485_on = uport->rs485_config && 162a6845e1eSRafael Gago (uport->rs485.flags & SER_RS485_ENABLED); 163a6845e1eSRafael Gago int RTS_after_send = !!(uport->rs485.flags & SER_RS485_RTS_AFTER_SEND); 164a6845e1eSRafael Gago 165a6845e1eSRafael Gago if (raise) { 166a6845e1eSRafael Gago if (rs485_on && !RTS_after_send) { 167a6845e1eSRafael Gago uart_set_mctrl(uport, TIOCM_DTR); 168a6845e1eSRafael Gago uart_clear_mctrl(uport, TIOCM_RTS); 169a6845e1eSRafael Gago } else { 170a6845e1eSRafael Gago uart_set_mctrl(uport, TIOCM_DTR | TIOCM_RTS); 171a6845e1eSRafael Gago } 172a6845e1eSRafael Gago } else { 173a6845e1eSRafael Gago unsigned int clear = TIOCM_DTR; 174a6845e1eSRafael Gago 175a6845e1eSRafael Gago clear |= (!rs485_on || !RTS_after_send) ? TIOCM_RTS : 0; 176a6845e1eSRafael Gago uart_clear_mctrl(uport, clear); 177a6845e1eSRafael Gago } 178a6845e1eSRafael Gago } 179a6845e1eSRafael Gago 180ab4382d2SGreg Kroah-Hartman /* 181ab4382d2SGreg Kroah-Hartman * Startup the port. This will be called once per open. All calls 182ab4382d2SGreg Kroah-Hartman * will be serialised by the per-port mutex. 183ab4382d2SGreg Kroah-Hartman */ 184c0d92be6SJiri Slaby static int uart_port_startup(struct tty_struct *tty, struct uart_state *state, 185c0d92be6SJiri Slaby int init_hw) 186ab4382d2SGreg Kroah-Hartman { 1874047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 188ab4382d2SGreg Kroah-Hartman unsigned long page; 189a5ba1d95STycho Andersen unsigned long flags = 0; 190ab4382d2SGreg Kroah-Hartman int retval = 0; 191ab4382d2SGreg Kroah-Hartman 192ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) 193c0d92be6SJiri Slaby return 1; 194ab4382d2SGreg Kroah-Hartman 195ab4382d2SGreg Kroah-Hartman /* 1967deb39edSThomas Pfaff * Make sure the device is in D0 state. 1977deb39edSThomas Pfaff */ 1987deb39edSThomas Pfaff uart_change_pm(state, UART_PM_STATE_ON); 1997deb39edSThomas Pfaff 2007deb39edSThomas Pfaff /* 201ab4382d2SGreg Kroah-Hartman * Initialise and allocate the transmit and temporary 202ab4382d2SGreg Kroah-Hartman * buffer. 203ab4382d2SGreg Kroah-Hartman */ 204ab4382d2SGreg Kroah-Hartman page = get_zeroed_page(GFP_KERNEL); 205ab4382d2SGreg Kroah-Hartman if (!page) 206ab4382d2SGreg Kroah-Hartman return -ENOMEM; 207ab4382d2SGreg Kroah-Hartman 208a5ba1d95STycho Andersen uart_port_lock(state, flags); 209a5ba1d95STycho Andersen if (!state->xmit.buf) { 210ab4382d2SGreg Kroah-Hartman state->xmit.buf = (unsigned char *) page; 211ab4382d2SGreg Kroah-Hartman uart_circ_clear(&state->xmit); 212d7240214SSergey Senozhatsky uart_port_unlock(uport, flags); 213a5ba1d95STycho Andersen } else { 214d7240214SSergey Senozhatsky uart_port_unlock(uport, flags); 215d7240214SSergey Senozhatsky /* 216d7240214SSergey Senozhatsky * Do not free() the page under the port lock, see 217d7240214SSergey Senozhatsky * uart_shutdown(). 218d7240214SSergey Senozhatsky */ 219a5ba1d95STycho Andersen free_page(page); 220ab4382d2SGreg Kroah-Hartman } 221ab4382d2SGreg Kroah-Hartman 222ab4382d2SGreg Kroah-Hartman retval = uport->ops->startup(uport); 223ab4382d2SGreg Kroah-Hartman if (retval == 0) { 224c7d7abffSJiri Slaby if (uart_console(uport) && uport->cons->cflag) { 225adc8d746SAlan Cox tty->termios.c_cflag = uport->cons->cflag; 226c7d7abffSJiri Slaby uport->cons->cflag = 0; 227c7d7abffSJiri Slaby } 228ab4382d2SGreg Kroah-Hartman /* 229ab4382d2SGreg Kroah-Hartman * Initialise the hardware port settings. 230ab4382d2SGreg Kroah-Hartman */ 231ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 232ab4382d2SGreg Kroah-Hartman 233ab4382d2SGreg Kroah-Hartman /* 234ab4382d2SGreg Kroah-Hartman * Setup the RTS and DTR signals once the 235ab4382d2SGreg Kroah-Hartman * port is open and ready to respond. 236ab4382d2SGreg Kroah-Hartman */ 2379db276f8SPeter Hurley if (init_hw && C_BAUD(tty)) 238a6845e1eSRafael Gago uart_port_dtr_rts(uport, 1); 239ab4382d2SGreg Kroah-Hartman } 240ab4382d2SGreg Kroah-Hartman 2410055197eSJiri Slaby /* 2420055197eSJiri Slaby * This is to allow setserial on this port. People may want to set 2430055197eSJiri Slaby * port/irq/type and then reconfigure the port properly if it failed 2440055197eSJiri Slaby * now. 2450055197eSJiri Slaby */ 246ab4382d2SGreg Kroah-Hartman if (retval && capable(CAP_SYS_ADMIN)) 247c0d92be6SJiri Slaby return 1; 248c0d92be6SJiri Slaby 249c0d92be6SJiri Slaby return retval; 250c0d92be6SJiri Slaby } 251c0d92be6SJiri Slaby 252c0d92be6SJiri Slaby static int uart_startup(struct tty_struct *tty, struct uart_state *state, 253c0d92be6SJiri Slaby int init_hw) 254c0d92be6SJiri Slaby { 255c0d92be6SJiri Slaby struct tty_port *port = &state->port; 256c0d92be6SJiri Slaby int retval; 257c0d92be6SJiri Slaby 258d41861caSPeter Hurley if (tty_port_initialized(port)) 259c0d92be6SJiri Slaby return 0; 260c0d92be6SJiri Slaby 261c0d92be6SJiri Slaby retval = uart_port_startup(tty, state, init_hw); 262b3b57646SRob Herring if (retval) 263b3b57646SRob Herring set_bit(TTY_IO_ERROR, &tty->flags); 264ab4382d2SGreg Kroah-Hartman 265ab4382d2SGreg Kroah-Hartman return retval; 266ab4382d2SGreg Kroah-Hartman } 267ab4382d2SGreg Kroah-Hartman 268ab4382d2SGreg Kroah-Hartman /* 269ab4382d2SGreg Kroah-Hartman * This routine will shutdown a serial port; interrupts are disabled, and 270ab4382d2SGreg Kroah-Hartman * DTR is dropped if the hangup on close termio flag is on. Calls to 271ab4382d2SGreg Kroah-Hartman * uart_shutdown are serialised by the per-port semaphore. 272af224ca2SPeter Hurley * 273af224ca2SPeter Hurley * uport == NULL if uart_port has already been removed 274ab4382d2SGreg Kroah-Hartman */ 275ab4382d2SGreg Kroah-Hartman static void uart_shutdown(struct tty_struct *tty, struct uart_state *state) 276ab4382d2SGreg Kroah-Hartman { 2774047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 278ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 279a5ba1d95STycho Andersen unsigned long flags = 0; 280d7240214SSergey Senozhatsky char *xmit_buf = NULL; 281ab4382d2SGreg Kroah-Hartman 282ab4382d2SGreg Kroah-Hartman /* 283ab4382d2SGreg Kroah-Hartman * Set the TTY IO error marker 284ab4382d2SGreg Kroah-Hartman */ 285ab4382d2SGreg Kroah-Hartman if (tty) 286ab4382d2SGreg Kroah-Hartman set_bit(TTY_IO_ERROR, &tty->flags); 287ab4382d2SGreg Kroah-Hartman 288d41861caSPeter Hurley if (tty_port_initialized(port)) { 289d41861caSPeter Hurley tty_port_set_initialized(port, 0); 290d41861caSPeter Hurley 291ab4382d2SGreg Kroah-Hartman /* 292ab4382d2SGreg Kroah-Hartman * Turn off DTR and RTS early. 293ab4382d2SGreg Kroah-Hartman */ 294af224ca2SPeter Hurley if (uport && uart_console(uport) && tty) 295ae84db96SPeter Hurley uport->cons->cflag = tty->termios.c_cflag; 296ae84db96SPeter Hurley 2979db276f8SPeter Hurley if (!tty || C_HUPCL(tty)) 298a6845e1eSRafael Gago uart_port_dtr_rts(uport, 0); 299ab4382d2SGreg Kroah-Hartman 300b922e19dSJiri Slaby uart_port_shutdown(port); 301ab4382d2SGreg Kroah-Hartman } 302ab4382d2SGreg Kroah-Hartman 303ab4382d2SGreg Kroah-Hartman /* 304d208a3bfSDoug Anderson * It's possible for shutdown to be called after suspend if we get 305d208a3bfSDoug Anderson * a DCD drop (hangup) at just the right time. Clear suspended bit so 306d208a3bfSDoug Anderson * we don't try to resume a port that has been shutdown. 307ab4382d2SGreg Kroah-Hartman */ 30880f02d54SPeter Hurley tty_port_set_suspended(port, 0); 309ab4382d2SGreg Kroah-Hartman 310ab4382d2SGreg Kroah-Hartman /* 311d7240214SSergey Senozhatsky * Do not free() the transmit buffer page under the port lock since 312d7240214SSergey Senozhatsky * this can create various circular locking scenarios. For instance, 313d7240214SSergey Senozhatsky * console driver may need to allocate/free a debug object, which 314d7240214SSergey Senozhatsky * can endup in printk() recursion. 315ab4382d2SGreg Kroah-Hartman */ 316a5ba1d95STycho Andersen uart_port_lock(state, flags); 317d7240214SSergey Senozhatsky xmit_buf = state->xmit.buf; 318ab4382d2SGreg Kroah-Hartman state->xmit.buf = NULL; 319a5ba1d95STycho Andersen uart_port_unlock(uport, flags); 320d7240214SSergey Senozhatsky 321d7240214SSergey Senozhatsky if (xmit_buf) 322d7240214SSergey Senozhatsky free_page((unsigned long)xmit_buf); 323ab4382d2SGreg Kroah-Hartman } 324ab4382d2SGreg Kroah-Hartman 325ab4382d2SGreg Kroah-Hartman /** 326ab4382d2SGreg Kroah-Hartman * uart_update_timeout - update per-port FIFO timeout. 327ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port 328ab4382d2SGreg Kroah-Hartman * @cflag: termios cflag value 329ab4382d2SGreg Kroah-Hartman * @baud: speed of the port 330ab4382d2SGreg Kroah-Hartman * 331ab4382d2SGreg Kroah-Hartman * Set the port FIFO timeout value. The @cflag value should 332ab4382d2SGreg Kroah-Hartman * reflect the actual hardware settings. 333ab4382d2SGreg Kroah-Hartman */ 334ab4382d2SGreg Kroah-Hartman void 335ab4382d2SGreg Kroah-Hartman uart_update_timeout(struct uart_port *port, unsigned int cflag, 336ab4382d2SGreg Kroah-Hartman unsigned int baud) 337ab4382d2SGreg Kroah-Hartman { 338ab4382d2SGreg Kroah-Hartman unsigned int bits; 339ab4382d2SGreg Kroah-Hartman 340ab4382d2SGreg Kroah-Hartman /* byte size and parity */ 341ab4382d2SGreg Kroah-Hartman switch (cflag & CSIZE) { 342ab4382d2SGreg Kroah-Hartman case CS5: 343ab4382d2SGreg Kroah-Hartman bits = 7; 344ab4382d2SGreg Kroah-Hartman break; 345ab4382d2SGreg Kroah-Hartman case CS6: 346ab4382d2SGreg Kroah-Hartman bits = 8; 347ab4382d2SGreg Kroah-Hartman break; 348ab4382d2SGreg Kroah-Hartman case CS7: 349ab4382d2SGreg Kroah-Hartman bits = 9; 350ab4382d2SGreg Kroah-Hartman break; 351ab4382d2SGreg Kroah-Hartman default: 352ab4382d2SGreg Kroah-Hartman bits = 10; 353ab4382d2SGreg Kroah-Hartman break; /* CS8 */ 354ab4382d2SGreg Kroah-Hartman } 355ab4382d2SGreg Kroah-Hartman 356ab4382d2SGreg Kroah-Hartman if (cflag & CSTOPB) 357ab4382d2SGreg Kroah-Hartman bits++; 358ab4382d2SGreg Kroah-Hartman if (cflag & PARENB) 359ab4382d2SGreg Kroah-Hartman bits++; 360ab4382d2SGreg Kroah-Hartman 361ab4382d2SGreg Kroah-Hartman /* 362ab4382d2SGreg Kroah-Hartman * The total number of bits to be transmitted in the fifo. 363ab4382d2SGreg Kroah-Hartman */ 364ab4382d2SGreg Kroah-Hartman bits = bits * port->fifosize; 365ab4382d2SGreg Kroah-Hartman 366ab4382d2SGreg Kroah-Hartman /* 367ab4382d2SGreg Kroah-Hartman * Figure the timeout to send the above number of bits. 368ab4382d2SGreg Kroah-Hartman * Add .02 seconds of slop 369ab4382d2SGreg Kroah-Hartman */ 370ab4382d2SGreg Kroah-Hartman port->timeout = (HZ * bits) / baud + HZ/50; 371ab4382d2SGreg Kroah-Hartman } 372ab4382d2SGreg Kroah-Hartman 373ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_update_timeout); 374ab4382d2SGreg Kroah-Hartman 375ab4382d2SGreg Kroah-Hartman /** 376ab4382d2SGreg Kroah-Hartman * uart_get_baud_rate - return baud rate for a particular port 377ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port in question. 378ab4382d2SGreg Kroah-Hartman * @termios: desired termios settings. 379ab4382d2SGreg Kroah-Hartman * @old: old termios (or NULL) 380ab4382d2SGreg Kroah-Hartman * @min: minimum acceptable baud rate 381ab4382d2SGreg Kroah-Hartman * @max: maximum acceptable baud rate 382ab4382d2SGreg Kroah-Hartman * 383ab4382d2SGreg Kroah-Hartman * Decode the termios structure into a numeric baud rate, 384ab4382d2SGreg Kroah-Hartman * taking account of the magic 38400 baud rate (with spd_* 385ab4382d2SGreg Kroah-Hartman * flags), and mapping the %B0 rate to 9600 baud. 386ab4382d2SGreg Kroah-Hartman * 387ab4382d2SGreg Kroah-Hartman * If the new baud rate is invalid, try the old termios setting. 388ab4382d2SGreg Kroah-Hartman * If it's still invalid, we try 9600 baud. 389ab4382d2SGreg Kroah-Hartman * 390ab4382d2SGreg Kroah-Hartman * Update the @termios structure to reflect the baud rate 391ab4382d2SGreg Kroah-Hartman * we're actually going to be using. Don't do this for the case 392ab4382d2SGreg Kroah-Hartman * where B0 is requested ("hang up"). 393ab4382d2SGreg Kroah-Hartman */ 394ab4382d2SGreg Kroah-Hartman unsigned int 395ab4382d2SGreg Kroah-Hartman uart_get_baud_rate(struct uart_port *port, struct ktermios *termios, 396ab4382d2SGreg Kroah-Hartman struct ktermios *old, unsigned int min, unsigned int max) 397ab4382d2SGreg Kroah-Hartman { 398f10a2233SJoakim Nordell unsigned int try; 399f10a2233SJoakim Nordell unsigned int baud; 400f10a2233SJoakim Nordell unsigned int altbaud; 401ab4382d2SGreg Kroah-Hartman int hung_up = 0; 402ab4382d2SGreg Kroah-Hartman upf_t flags = port->flags & UPF_SPD_MASK; 403ab4382d2SGreg Kroah-Hartman 404f10a2233SJoakim Nordell switch (flags) { 405f10a2233SJoakim Nordell case UPF_SPD_HI: 406ab4382d2SGreg Kroah-Hartman altbaud = 57600; 407f10a2233SJoakim Nordell break; 408f10a2233SJoakim Nordell case UPF_SPD_VHI: 409ab4382d2SGreg Kroah-Hartman altbaud = 115200; 410f10a2233SJoakim Nordell break; 411f10a2233SJoakim Nordell case UPF_SPD_SHI: 412ab4382d2SGreg Kroah-Hartman altbaud = 230400; 413f10a2233SJoakim Nordell break; 414f10a2233SJoakim Nordell case UPF_SPD_WARP: 415ab4382d2SGreg Kroah-Hartman altbaud = 460800; 416f10a2233SJoakim Nordell break; 417f10a2233SJoakim Nordell default: 418f10a2233SJoakim Nordell altbaud = 38400; 419f10a2233SJoakim Nordell break; 420f10a2233SJoakim Nordell } 421ab4382d2SGreg Kroah-Hartman 422ab4382d2SGreg Kroah-Hartman for (try = 0; try < 2; try++) { 423ab4382d2SGreg Kroah-Hartman baud = tty_termios_baud_rate(termios); 424ab4382d2SGreg Kroah-Hartman 425ab4382d2SGreg Kroah-Hartman /* 426ab4382d2SGreg Kroah-Hartman * The spd_hi, spd_vhi, spd_shi, spd_warp kludge... 427ab4382d2SGreg Kroah-Hartman * Die! Die! Die! 428ab4382d2SGreg Kroah-Hartman */ 429547039ecSPeter Hurley if (try == 0 && baud == 38400) 430ab4382d2SGreg Kroah-Hartman baud = altbaud; 431ab4382d2SGreg Kroah-Hartman 432ab4382d2SGreg Kroah-Hartman /* 433ab4382d2SGreg Kroah-Hartman * Special case: B0 rate. 434ab4382d2SGreg Kroah-Hartman */ 435ab4382d2SGreg Kroah-Hartman if (baud == 0) { 436ab4382d2SGreg Kroah-Hartman hung_up = 1; 437ab4382d2SGreg Kroah-Hartman baud = 9600; 438ab4382d2SGreg Kroah-Hartman } 439ab4382d2SGreg Kroah-Hartman 440ab4382d2SGreg Kroah-Hartman if (baud >= min && baud <= max) 441ab4382d2SGreg Kroah-Hartman return baud; 442ab4382d2SGreg Kroah-Hartman 443ab4382d2SGreg Kroah-Hartman /* 444ab4382d2SGreg Kroah-Hartman * Oops, the quotient was zero. Try again with 445ab4382d2SGreg Kroah-Hartman * the old baud rate if possible. 446ab4382d2SGreg Kroah-Hartman */ 447ab4382d2SGreg Kroah-Hartman termios->c_cflag &= ~CBAUD; 448ab4382d2SGreg Kroah-Hartman if (old) { 449ab4382d2SGreg Kroah-Hartman baud = tty_termios_baud_rate(old); 450ab4382d2SGreg Kroah-Hartman if (!hung_up) 451ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 452ab4382d2SGreg Kroah-Hartman baud, baud); 453ab4382d2SGreg Kroah-Hartman old = NULL; 454ab4382d2SGreg Kroah-Hartman continue; 455ab4382d2SGreg Kroah-Hartman } 456ab4382d2SGreg Kroah-Hartman 457ab4382d2SGreg Kroah-Hartman /* 458ab4382d2SGreg Kroah-Hartman * As a last resort, if the range cannot be met then clip to 459ab4382d2SGreg Kroah-Hartman * the nearest chip supported rate. 460ab4382d2SGreg Kroah-Hartman */ 461ab4382d2SGreg Kroah-Hartman if (!hung_up) { 462ab4382d2SGreg Kroah-Hartman if (baud <= min) 463ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 464ab4382d2SGreg Kroah-Hartman min + 1, min + 1); 465ab4382d2SGreg Kroah-Hartman else 466ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 467ab4382d2SGreg Kroah-Hartman max - 1, max - 1); 468ab4382d2SGreg Kroah-Hartman } 469ab4382d2SGreg Kroah-Hartman } 470ab4382d2SGreg Kroah-Hartman /* Should never happen */ 471ab4382d2SGreg Kroah-Hartman WARN_ON(1); 472ab4382d2SGreg Kroah-Hartman return 0; 473ab4382d2SGreg Kroah-Hartman } 474ab4382d2SGreg Kroah-Hartman 475ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_get_baud_rate); 476ab4382d2SGreg Kroah-Hartman 477ab4382d2SGreg Kroah-Hartman /** 478ab4382d2SGreg Kroah-Hartman * uart_get_divisor - return uart clock divisor 479ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port. 480ab4382d2SGreg Kroah-Hartman * @baud: desired baud rate 481ab4382d2SGreg Kroah-Hartman * 482ab4382d2SGreg Kroah-Hartman * Calculate the uart clock divisor for the port. 483ab4382d2SGreg Kroah-Hartman */ 484ab4382d2SGreg Kroah-Hartman unsigned int 485ab4382d2SGreg Kroah-Hartman uart_get_divisor(struct uart_port *port, unsigned int baud) 486ab4382d2SGreg Kroah-Hartman { 487ab4382d2SGreg Kroah-Hartman unsigned int quot; 488ab4382d2SGreg Kroah-Hartman 489ab4382d2SGreg Kroah-Hartman /* 490ab4382d2SGreg Kroah-Hartman * Old custom speed handling. 491ab4382d2SGreg Kroah-Hartman */ 492ab4382d2SGreg Kroah-Hartman if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) 493ab4382d2SGreg Kroah-Hartman quot = port->custom_divisor; 494ab4382d2SGreg Kroah-Hartman else 49597d24634SUwe Kleine-König quot = DIV_ROUND_CLOSEST(port->uartclk, 16 * baud); 496ab4382d2SGreg Kroah-Hartman 497ab4382d2SGreg Kroah-Hartman return quot; 498ab4382d2SGreg Kroah-Hartman } 499ab4382d2SGreg Kroah-Hartman 500ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_get_divisor); 501ab4382d2SGreg Kroah-Hartman 5027c8ab967SPeter Hurley /* Caller holds port mutex */ 503ab4382d2SGreg Kroah-Hartman static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, 504ab4382d2SGreg Kroah-Hartman struct ktermios *old_termios) 505ab4382d2SGreg Kroah-Hartman { 5064047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 507ab4382d2SGreg Kroah-Hartman struct ktermios *termios; 508391f93f2SPeter Hurley int hw_stopped; 509ab4382d2SGreg Kroah-Hartman 510ab4382d2SGreg Kroah-Hartman /* 511ab4382d2SGreg Kroah-Hartman * If we have no tty, termios, or the port does not exist, 512ab4382d2SGreg Kroah-Hartman * then we can't set the parameters for this port. 513ab4382d2SGreg Kroah-Hartman */ 514adc8d746SAlan Cox if (!tty || uport->type == PORT_UNKNOWN) 515ab4382d2SGreg Kroah-Hartman return; 516ab4382d2SGreg Kroah-Hartman 517adc8d746SAlan Cox termios = &tty->termios; 518c18b55fdSPeter Hurley uport->ops->set_termios(uport, termios, old_termios); 519ab4382d2SGreg Kroah-Hartman 520ab4382d2SGreg Kroah-Hartman /* 521299245a1SPeter Hurley * Set modem status enables based on termios cflag 522ab4382d2SGreg Kroah-Hartman */ 523299245a1SPeter Hurley spin_lock_irq(&uport->lock); 524ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CRTSCTS) 525299245a1SPeter Hurley uport->status |= UPSTAT_CTS_ENABLE; 526ab4382d2SGreg Kroah-Hartman else 527299245a1SPeter Hurley uport->status &= ~UPSTAT_CTS_ENABLE; 528ab4382d2SGreg Kroah-Hartman 529ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CLOCAL) 530299245a1SPeter Hurley uport->status &= ~UPSTAT_DCD_ENABLE; 531ab4382d2SGreg Kroah-Hartman else 532299245a1SPeter Hurley uport->status |= UPSTAT_DCD_ENABLE; 533391f93f2SPeter Hurley 534391f93f2SPeter Hurley /* reset sw-assisted CTS flow control based on (possibly) new mode */ 535391f93f2SPeter Hurley hw_stopped = uport->hw_stopped; 536391f93f2SPeter Hurley uport->hw_stopped = uart_softcts_mode(uport) && 537391f93f2SPeter Hurley !(uport->ops->get_mctrl(uport) & TIOCM_CTS); 538391f93f2SPeter Hurley if (uport->hw_stopped) { 539391f93f2SPeter Hurley if (!hw_stopped) 540391f93f2SPeter Hurley uport->ops->stop_tx(uport); 541391f93f2SPeter Hurley } else { 542391f93f2SPeter Hurley if (hw_stopped) 543391f93f2SPeter Hurley __uart_start(tty); 544391f93f2SPeter Hurley } 545299245a1SPeter Hurley spin_unlock_irq(&uport->lock); 546ab4382d2SGreg Kroah-Hartman } 547ab4382d2SGreg Kroah-Hartman 548f5291eccSPeter Hurley static int uart_put_char(struct tty_struct *tty, unsigned char c) 549ab4382d2SGreg Kroah-Hartman { 550f5291eccSPeter Hurley struct uart_state *state = tty->driver_data; 5519ed19428SPeter Hurley struct uart_port *port; 552f5291eccSPeter Hurley struct circ_buf *circ; 553ab4382d2SGreg Kroah-Hartman unsigned long flags; 554ab4382d2SGreg Kroah-Hartman int ret = 0; 555ab4382d2SGreg Kroah-Hartman 556f5291eccSPeter Hurley circ = &state->xmit; 5579ed19428SPeter Hurley port = uart_port_lock(state, flags); 558aff9cf59SSamir Virmani if (!circ->buf) { 559aff9cf59SSamir Virmani uart_port_unlock(port, flags); 560aff9cf59SSamir Virmani return 0; 561aff9cf59SSamir Virmani } 562aff9cf59SSamir Virmani 5639ed19428SPeter Hurley if (port && uart_circ_chars_free(circ) != 0) { 564ab4382d2SGreg Kroah-Hartman circ->buf[circ->head] = c; 565ab4382d2SGreg Kroah-Hartman circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1); 566ab4382d2SGreg Kroah-Hartman ret = 1; 567ab4382d2SGreg Kroah-Hartman } 5689ed19428SPeter Hurley uart_port_unlock(port, flags); 569ab4382d2SGreg Kroah-Hartman return ret; 570ab4382d2SGreg Kroah-Hartman } 571ab4382d2SGreg Kroah-Hartman 572ab4382d2SGreg Kroah-Hartman static void uart_flush_chars(struct tty_struct *tty) 573ab4382d2SGreg Kroah-Hartman { 574ab4382d2SGreg Kroah-Hartman uart_start(tty); 575ab4382d2SGreg Kroah-Hartman } 576ab4382d2SGreg Kroah-Hartman 577ab4382d2SGreg Kroah-Hartman static int uart_write(struct tty_struct *tty, 578ab4382d2SGreg Kroah-Hartman const unsigned char *buf, int count) 579ab4382d2SGreg Kroah-Hartman { 580ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 581ab4382d2SGreg Kroah-Hartman struct uart_port *port; 582ab4382d2SGreg Kroah-Hartman struct circ_buf *circ; 583ab4382d2SGreg Kroah-Hartman unsigned long flags; 584ab4382d2SGreg Kroah-Hartman int c, ret = 0; 585ab4382d2SGreg Kroah-Hartman 586ab4382d2SGreg Kroah-Hartman /* 587ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 588ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 589ab4382d2SGreg Kroah-Hartman */ 590ab4382d2SGreg Kroah-Hartman if (!state) { 591ab4382d2SGreg Kroah-Hartman WARN_ON(1); 592ab4382d2SGreg Kroah-Hartman return -EL3HLT; 593ab4382d2SGreg Kroah-Hartman } 594ab4382d2SGreg Kroah-Hartman 5959ed19428SPeter Hurley port = uart_port_lock(state, flags); 596aff9cf59SSamir Virmani circ = &state->xmit; 597aff9cf59SSamir Virmani if (!circ->buf) { 598aff9cf59SSamir Virmani uart_port_unlock(port, flags); 599aff9cf59SSamir Virmani return 0; 600aff9cf59SSamir Virmani } 601aff9cf59SSamir Virmani 6029ed19428SPeter Hurley while (port) { 603ab4382d2SGreg Kroah-Hartman c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE); 604ab4382d2SGreg Kroah-Hartman if (count < c) 605ab4382d2SGreg Kroah-Hartman c = count; 606ab4382d2SGreg Kroah-Hartman if (c <= 0) 607ab4382d2SGreg Kroah-Hartman break; 608ab4382d2SGreg Kroah-Hartman memcpy(circ->buf + circ->head, buf, c); 609ab4382d2SGreg Kroah-Hartman circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1); 610ab4382d2SGreg Kroah-Hartman buf += c; 611ab4382d2SGreg Kroah-Hartman count -= c; 612ab4382d2SGreg Kroah-Hartman ret += c; 613ab4382d2SGreg Kroah-Hartman } 61464dbee31SPeter Hurley 61564dbee31SPeter Hurley __uart_start(tty); 6169ed19428SPeter Hurley uart_port_unlock(port, flags); 617ab4382d2SGreg Kroah-Hartman return ret; 618ab4382d2SGreg Kroah-Hartman } 619ab4382d2SGreg Kroah-Hartman 620ab4382d2SGreg Kroah-Hartman static int uart_write_room(struct tty_struct *tty) 621ab4382d2SGreg Kroah-Hartman { 622ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 6239ed19428SPeter Hurley struct uart_port *port; 624ab4382d2SGreg Kroah-Hartman unsigned long flags; 625ab4382d2SGreg Kroah-Hartman int ret; 626ab4382d2SGreg Kroah-Hartman 6279ed19428SPeter Hurley port = uart_port_lock(state, flags); 628ab4382d2SGreg Kroah-Hartman ret = uart_circ_chars_free(&state->xmit); 6299ed19428SPeter Hurley uart_port_unlock(port, flags); 630ab4382d2SGreg Kroah-Hartman return ret; 631ab4382d2SGreg Kroah-Hartman } 632ab4382d2SGreg Kroah-Hartman 633ab4382d2SGreg Kroah-Hartman static int uart_chars_in_buffer(struct tty_struct *tty) 634ab4382d2SGreg Kroah-Hartman { 635ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 6369ed19428SPeter Hurley struct uart_port *port; 637ab4382d2SGreg Kroah-Hartman unsigned long flags; 638ab4382d2SGreg Kroah-Hartman int ret; 639ab4382d2SGreg Kroah-Hartman 6409ed19428SPeter Hurley port = uart_port_lock(state, flags); 641ab4382d2SGreg Kroah-Hartman ret = uart_circ_chars_pending(&state->xmit); 6429ed19428SPeter Hurley uart_port_unlock(port, flags); 643ab4382d2SGreg Kroah-Hartman return ret; 644ab4382d2SGreg Kroah-Hartman } 645ab4382d2SGreg Kroah-Hartman 646ab4382d2SGreg Kroah-Hartman static void uart_flush_buffer(struct tty_struct *tty) 647ab4382d2SGreg Kroah-Hartman { 648ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 649ab4382d2SGreg Kroah-Hartman struct uart_port *port; 650ab4382d2SGreg Kroah-Hartman unsigned long flags; 651ab4382d2SGreg Kroah-Hartman 652ab4382d2SGreg Kroah-Hartman /* 653ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 654ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 655ab4382d2SGreg Kroah-Hartman */ 656ab4382d2SGreg Kroah-Hartman if (!state) { 657ab4382d2SGreg Kroah-Hartman WARN_ON(1); 658ab4382d2SGreg Kroah-Hartman return; 659ab4382d2SGreg Kroah-Hartman } 660ab4382d2SGreg Kroah-Hartman 661ab4382d2SGreg Kroah-Hartman pr_debug("uart_flush_buffer(%d) called\n", tty->index); 662ab4382d2SGreg Kroah-Hartman 6639ed19428SPeter Hurley port = uart_port_lock(state, flags); 6649ed19428SPeter Hurley if (!port) 6659ed19428SPeter Hurley return; 666ab4382d2SGreg Kroah-Hartman uart_circ_clear(&state->xmit); 667ab4382d2SGreg Kroah-Hartman if (port->ops->flush_buffer) 668ab4382d2SGreg Kroah-Hartman port->ops->flush_buffer(port); 6699ed19428SPeter Hurley uart_port_unlock(port, flags); 670d0f4bce2SRob Herring tty_port_tty_wakeup(&state->port); 671ab4382d2SGreg Kroah-Hartman } 672ab4382d2SGreg Kroah-Hartman 673ab4382d2SGreg Kroah-Hartman /* 674ab4382d2SGreg Kroah-Hartman * This function is used to send a high-priority XON/XOFF character to 675ab4382d2SGreg Kroah-Hartman * the device 676ab4382d2SGreg Kroah-Hartman */ 677ab4382d2SGreg Kroah-Hartman static void uart_send_xchar(struct tty_struct *tty, char ch) 678ab4382d2SGreg Kroah-Hartman { 679ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 6809ed19428SPeter Hurley struct uart_port *port; 681ab4382d2SGreg Kroah-Hartman unsigned long flags; 682ab4382d2SGreg Kroah-Hartman 6839ed19428SPeter Hurley port = uart_port_ref(state); 6849ed19428SPeter Hurley if (!port) 6859ed19428SPeter Hurley return; 6869ed19428SPeter Hurley 687ab4382d2SGreg Kroah-Hartman if (port->ops->send_xchar) 688ab4382d2SGreg Kroah-Hartman port->ops->send_xchar(port, ch); 689ab4382d2SGreg Kroah-Hartman else { 690ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 691c235ccc1SPeter Hurley port->x_char = ch; 692c235ccc1SPeter Hurley if (ch) 693ab4382d2SGreg Kroah-Hartman port->ops->start_tx(port); 694ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 695ab4382d2SGreg Kroah-Hartman } 6969ed19428SPeter Hurley uart_port_deref(port); 697ab4382d2SGreg Kroah-Hartman } 698ab4382d2SGreg Kroah-Hartman 699ab4382d2SGreg Kroah-Hartman static void uart_throttle(struct tty_struct *tty) 700ab4382d2SGreg Kroah-Hartman { 701ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 702c5f78b1fSJeremy Kerr upstat_t mask = UPSTAT_SYNC_FIFO; 7039ed19428SPeter Hurley struct uart_port *port; 704ab4382d2SGreg Kroah-Hartman 7059ed19428SPeter Hurley port = uart_port_ref(state); 7069ed19428SPeter Hurley if (!port) 7079ed19428SPeter Hurley return; 7089ed19428SPeter Hurley 709ab4382d2SGreg Kroah-Hartman if (I_IXOFF(tty)) 710391f93f2SPeter Hurley mask |= UPSTAT_AUTOXOFF; 7119db276f8SPeter Hurley if (C_CRTSCTS(tty)) 712391f93f2SPeter Hurley mask |= UPSTAT_AUTORTS; 7139aba8d5bSRussell King 714391f93f2SPeter Hurley if (port->status & mask) { 7159aba8d5bSRussell King port->ops->throttle(port); 716391f93f2SPeter Hurley mask &= ~port->status; 7179aba8d5bSRussell King } 7189aba8d5bSRussell King 719391f93f2SPeter Hurley if (mask & UPSTAT_AUTORTS) 7209aba8d5bSRussell King uart_clear_mctrl(port, TIOCM_RTS); 721b4749b97SPeter Hurley 722b4749b97SPeter Hurley if (mask & UPSTAT_AUTOXOFF) 723b4749b97SPeter Hurley uart_send_xchar(tty, STOP_CHAR(tty)); 7249ed19428SPeter Hurley 7259ed19428SPeter Hurley uart_port_deref(port); 726ab4382d2SGreg Kroah-Hartman } 727ab4382d2SGreg Kroah-Hartman 728ab4382d2SGreg Kroah-Hartman static void uart_unthrottle(struct tty_struct *tty) 729ab4382d2SGreg Kroah-Hartman { 730ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 731c5f78b1fSJeremy Kerr upstat_t mask = UPSTAT_SYNC_FIFO; 7329ed19428SPeter Hurley struct uart_port *port; 733ab4382d2SGreg Kroah-Hartman 7349ed19428SPeter Hurley port = uart_port_ref(state); 7359ed19428SPeter Hurley if (!port) 7369ed19428SPeter Hurley return; 7379ed19428SPeter Hurley 7389aba8d5bSRussell King if (I_IXOFF(tty)) 739391f93f2SPeter Hurley mask |= UPSTAT_AUTOXOFF; 7409db276f8SPeter Hurley if (C_CRTSCTS(tty)) 741391f93f2SPeter Hurley mask |= UPSTAT_AUTORTS; 7429aba8d5bSRussell King 743391f93f2SPeter Hurley if (port->status & mask) { 7449aba8d5bSRussell King port->ops->unthrottle(port); 745391f93f2SPeter Hurley mask &= ~port->status; 7469aba8d5bSRussell King } 7479aba8d5bSRussell King 748391f93f2SPeter Hurley if (mask & UPSTAT_AUTORTS) 749ab4382d2SGreg Kroah-Hartman uart_set_mctrl(port, TIOCM_RTS); 750b4749b97SPeter Hurley 751b4749b97SPeter Hurley if (mask & UPSTAT_AUTOXOFF) 752b4749b97SPeter Hurley uart_send_xchar(tty, START_CHAR(tty)); 7539ed19428SPeter Hurley 7549ed19428SPeter Hurley uart_port_deref(port); 755ab4382d2SGreg Kroah-Hartman } 756ab4382d2SGreg Kroah-Hartman 7574047b371SPeter Hurley static int uart_get_info(struct tty_port *port, struct serial_struct *retinfo) 758ab4382d2SGreg Kroah-Hartman { 7599f109694SAlan Cox struct uart_state *state = container_of(port, struct uart_state, port); 7604047b371SPeter Hurley struct uart_port *uport; 7614047b371SPeter Hurley int ret = -ENODEV; 7627ba2e769SAlan Cox 76337cd0c99SFengguang Wu memset(retinfo, 0, sizeof(*retinfo)); 7647ba2e769SAlan Cox 7653abe8c76SPeter Hurley /* 7663abe8c76SPeter Hurley * Ensure the state we copy is consistent and no hardware changes 7673abe8c76SPeter Hurley * occur as we go 7683abe8c76SPeter Hurley */ 7693abe8c76SPeter Hurley mutex_lock(&port->mutex); 7704047b371SPeter Hurley uport = uart_port_check(state); 7714047b371SPeter Hurley if (!uport) 7724047b371SPeter Hurley goto out; 7734047b371SPeter Hurley 7747ba2e769SAlan Cox retinfo->type = uport->type; 7757ba2e769SAlan Cox retinfo->line = uport->line; 7767ba2e769SAlan Cox retinfo->port = uport->iobase; 7777ba2e769SAlan Cox if (HIGH_BITS_OFFSET) 7787ba2e769SAlan Cox retinfo->port_high = (long) uport->iobase >> HIGH_BITS_OFFSET; 7797ba2e769SAlan Cox retinfo->irq = uport->irq; 780a17e74c5SAndy Shevchenko retinfo->flags = (__force int)uport->flags; 7817ba2e769SAlan Cox retinfo->xmit_fifo_size = uport->fifosize; 7827ba2e769SAlan Cox retinfo->baud_base = uport->uartclk / 16; 7837ba2e769SAlan Cox retinfo->close_delay = jiffies_to_msecs(port->close_delay) / 10; 7847ba2e769SAlan Cox retinfo->closing_wait = port->closing_wait == ASYNC_CLOSING_WAIT_NONE ? 7857ba2e769SAlan Cox ASYNC_CLOSING_WAIT_NONE : 7867ba2e769SAlan Cox jiffies_to_msecs(port->closing_wait) / 10; 7877ba2e769SAlan Cox retinfo->custom_divisor = uport->custom_divisor; 7887ba2e769SAlan Cox retinfo->hub6 = uport->hub6; 7897ba2e769SAlan Cox retinfo->io_type = uport->iotype; 7907ba2e769SAlan Cox retinfo->iomem_reg_shift = uport->regshift; 7917ba2e769SAlan Cox retinfo->iomem_base = (void *)(unsigned long)uport->mapbase; 7924047b371SPeter Hurley 7934047b371SPeter Hurley ret = 0; 7944047b371SPeter Hurley out: 795ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 7964047b371SPeter Hurley return ret; 7979f109694SAlan Cox } 7989f109694SAlan Cox 7995099d234SAl Viro static int uart_get_info_user(struct tty_struct *tty, 8005099d234SAl Viro struct serial_struct *ss) 8019f109694SAlan Cox { 8025099d234SAl Viro struct uart_state *state = tty->driver_data; 8035099d234SAl Viro struct tty_port *port = &state->port; 8043abe8c76SPeter Hurley 8055099d234SAl Viro return uart_get_info(port, ss) < 0 ? -EIO : 0; 806ab4382d2SGreg Kroah-Hartman } 807ab4382d2SGreg Kroah-Hartman 8087ba2e769SAlan Cox static int uart_set_info(struct tty_struct *tty, struct tty_port *port, 8097ba2e769SAlan Cox struct uart_state *state, 8107ba2e769SAlan Cox struct serial_struct *new_info) 811ab4382d2SGreg Kroah-Hartman { 8124047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 813ab4382d2SGreg Kroah-Hartman unsigned long new_port; 814ab4382d2SGreg Kroah-Hartman unsigned int change_irq, change_port, closing_wait; 815ab4382d2SGreg Kroah-Hartman unsigned int old_custom_divisor, close_delay; 816ab4382d2SGreg Kroah-Hartman upf_t old_flags, new_flags; 817ab4382d2SGreg Kroah-Hartman int retval = 0; 818ab4382d2SGreg Kroah-Hartman 8194047b371SPeter Hurley if (!uport) 8204047b371SPeter Hurley return -EIO; 8214047b371SPeter Hurley 8227ba2e769SAlan Cox new_port = new_info->port; 823ab4382d2SGreg Kroah-Hartman if (HIGH_BITS_OFFSET) 8247ba2e769SAlan Cox new_port += (unsigned long) new_info->port_high << HIGH_BITS_OFFSET; 825ab4382d2SGreg Kroah-Hartman 8267ba2e769SAlan Cox new_info->irq = irq_canonicalize(new_info->irq); 8277ba2e769SAlan Cox close_delay = msecs_to_jiffies(new_info->close_delay * 10); 8287ba2e769SAlan Cox closing_wait = new_info->closing_wait == ASYNC_CLOSING_WAIT_NONE ? 8294cb0fbfdSJiri Slaby ASYNC_CLOSING_WAIT_NONE : 8307ba2e769SAlan Cox msecs_to_jiffies(new_info->closing_wait * 10); 831ab4382d2SGreg Kroah-Hartman 832ab4382d2SGreg Kroah-Hartman 833ab4382d2SGreg Kroah-Hartman change_irq = !(uport->flags & UPF_FIXED_PORT) 8347ba2e769SAlan Cox && new_info->irq != uport->irq; 835ab4382d2SGreg Kroah-Hartman 836ab4382d2SGreg Kroah-Hartman /* 837ab4382d2SGreg Kroah-Hartman * Since changing the 'type' of the port changes its resource 838ab4382d2SGreg Kroah-Hartman * allocations, we should treat type changes the same as 839ab4382d2SGreg Kroah-Hartman * IO port changes. 840ab4382d2SGreg Kroah-Hartman */ 841ab4382d2SGreg Kroah-Hartman change_port = !(uport->flags & UPF_FIXED_PORT) 842ab4382d2SGreg Kroah-Hartman && (new_port != uport->iobase || 8437ba2e769SAlan Cox (unsigned long)new_info->iomem_base != uport->mapbase || 8447ba2e769SAlan Cox new_info->hub6 != uport->hub6 || 8457ba2e769SAlan Cox new_info->io_type != uport->iotype || 8467ba2e769SAlan Cox new_info->iomem_reg_shift != uport->regshift || 8477ba2e769SAlan Cox new_info->type != uport->type); 848ab4382d2SGreg Kroah-Hartman 849ab4382d2SGreg Kroah-Hartman old_flags = uport->flags; 850a17e74c5SAndy Shevchenko new_flags = (__force upf_t)new_info->flags; 851ab4382d2SGreg Kroah-Hartman old_custom_divisor = uport->custom_divisor; 852ab4382d2SGreg Kroah-Hartman 853ab4382d2SGreg Kroah-Hartman if (!capable(CAP_SYS_ADMIN)) { 854ab4382d2SGreg Kroah-Hartman retval = -EPERM; 855ab4382d2SGreg Kroah-Hartman if (change_irq || change_port || 8567ba2e769SAlan Cox (new_info->baud_base != uport->uartclk / 16) || 857ab4382d2SGreg Kroah-Hartman (close_delay != port->close_delay) || 858ab4382d2SGreg Kroah-Hartman (closing_wait != port->closing_wait) || 8597ba2e769SAlan Cox (new_info->xmit_fifo_size && 8607ba2e769SAlan Cox new_info->xmit_fifo_size != uport->fifosize) || 861ab4382d2SGreg Kroah-Hartman (((new_flags ^ old_flags) & ~UPF_USR_MASK) != 0)) 862ab4382d2SGreg Kroah-Hartman goto exit; 863ab4382d2SGreg Kroah-Hartman uport->flags = ((uport->flags & ~UPF_USR_MASK) | 864ab4382d2SGreg Kroah-Hartman (new_flags & UPF_USR_MASK)); 8657ba2e769SAlan Cox uport->custom_divisor = new_info->custom_divisor; 866ab4382d2SGreg Kroah-Hartman goto check_and_exit; 867ab4382d2SGreg Kroah-Hartman } 868ab4382d2SGreg Kroah-Hartman 869794edf30SDavid Howells retval = security_locked_down(LOCKDOWN_TIOCSSERIAL); 870794edf30SDavid Howells if (retval && (change_irq || change_port)) 871794edf30SDavid Howells goto exit; 872794edf30SDavid Howells 873ab4382d2SGreg Kroah-Hartman /* 874ab4382d2SGreg Kroah-Hartman * Ask the low level driver to verify the settings. 875ab4382d2SGreg Kroah-Hartman */ 876ab4382d2SGreg Kroah-Hartman if (uport->ops->verify_port) 8777ba2e769SAlan Cox retval = uport->ops->verify_port(uport, new_info); 878ab4382d2SGreg Kroah-Hartman 8797ba2e769SAlan Cox if ((new_info->irq >= nr_irqs) || (new_info->irq < 0) || 8807ba2e769SAlan Cox (new_info->baud_base < 9600)) 881ab4382d2SGreg Kroah-Hartman retval = -EINVAL; 882ab4382d2SGreg Kroah-Hartman 883ab4382d2SGreg Kroah-Hartman if (retval) 884ab4382d2SGreg Kroah-Hartman goto exit; 885ab4382d2SGreg Kroah-Hartman 886ab4382d2SGreg Kroah-Hartman if (change_port || change_irq) { 887ab4382d2SGreg Kroah-Hartman retval = -EBUSY; 888ab4382d2SGreg Kroah-Hartman 889ab4382d2SGreg Kroah-Hartman /* 890ab4382d2SGreg Kroah-Hartman * Make sure that we are the sole user of this port. 891ab4382d2SGreg Kroah-Hartman */ 892ab4382d2SGreg Kroah-Hartman if (tty_port_users(port) > 1) 893ab4382d2SGreg Kroah-Hartman goto exit; 894ab4382d2SGreg Kroah-Hartman 895ab4382d2SGreg Kroah-Hartman /* 896ab4382d2SGreg Kroah-Hartman * We need to shutdown the serial port at the old 897ab4382d2SGreg Kroah-Hartman * port/type/irq combination. 898ab4382d2SGreg Kroah-Hartman */ 899ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 900ab4382d2SGreg Kroah-Hartman } 901ab4382d2SGreg Kroah-Hartman 902ab4382d2SGreg Kroah-Hartman if (change_port) { 903ab4382d2SGreg Kroah-Hartman unsigned long old_iobase, old_mapbase; 904ab4382d2SGreg Kroah-Hartman unsigned int old_type, old_iotype, old_hub6, old_shift; 905ab4382d2SGreg Kroah-Hartman 906ab4382d2SGreg Kroah-Hartman old_iobase = uport->iobase; 907ab4382d2SGreg Kroah-Hartman old_mapbase = uport->mapbase; 908ab4382d2SGreg Kroah-Hartman old_type = uport->type; 909ab4382d2SGreg Kroah-Hartman old_hub6 = uport->hub6; 910ab4382d2SGreg Kroah-Hartman old_iotype = uport->iotype; 911ab4382d2SGreg Kroah-Hartman old_shift = uport->regshift; 912ab4382d2SGreg Kroah-Hartman 913ab4382d2SGreg Kroah-Hartman /* 914ab4382d2SGreg Kroah-Hartman * Free and release old regions 915ab4382d2SGreg Kroah-Hartman */ 916a7cfaf16SFabio Estevam if (old_type != PORT_UNKNOWN && uport->ops->release_port) 917ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 918ab4382d2SGreg Kroah-Hartman 919ab4382d2SGreg Kroah-Hartman uport->iobase = new_port; 9207ba2e769SAlan Cox uport->type = new_info->type; 9217ba2e769SAlan Cox uport->hub6 = new_info->hub6; 9227ba2e769SAlan Cox uport->iotype = new_info->io_type; 9237ba2e769SAlan Cox uport->regshift = new_info->iomem_reg_shift; 9247ba2e769SAlan Cox uport->mapbase = (unsigned long)new_info->iomem_base; 925ab4382d2SGreg Kroah-Hartman 926ab4382d2SGreg Kroah-Hartman /* 927ab4382d2SGreg Kroah-Hartman * Claim and map the new regions 928ab4382d2SGreg Kroah-Hartman */ 929a7cfaf16SFabio Estevam if (uport->type != PORT_UNKNOWN && uport->ops->request_port) { 930ab4382d2SGreg Kroah-Hartman retval = uport->ops->request_port(uport); 931ab4382d2SGreg Kroah-Hartman } else { 932ab4382d2SGreg Kroah-Hartman /* Always success - Jean II */ 933ab4382d2SGreg Kroah-Hartman retval = 0; 934ab4382d2SGreg Kroah-Hartman } 935ab4382d2SGreg Kroah-Hartman 936ab4382d2SGreg Kroah-Hartman /* 937ab4382d2SGreg Kroah-Hartman * If we fail to request resources for the 938ab4382d2SGreg Kroah-Hartman * new port, try to restore the old settings. 939ab4382d2SGreg Kroah-Hartman */ 9407deb39edSThomas Pfaff if (retval) { 941ab4382d2SGreg Kroah-Hartman uport->iobase = old_iobase; 942ab4382d2SGreg Kroah-Hartman uport->type = old_type; 943ab4382d2SGreg Kroah-Hartman uport->hub6 = old_hub6; 944ab4382d2SGreg Kroah-Hartman uport->iotype = old_iotype; 945ab4382d2SGreg Kroah-Hartman uport->regshift = old_shift; 946ab4382d2SGreg Kroah-Hartman uport->mapbase = old_mapbase; 9477deb39edSThomas Pfaff 9487deb39edSThomas Pfaff if (old_type != PORT_UNKNOWN) { 949ab4382d2SGreg Kroah-Hartman retval = uport->ops->request_port(uport); 950ab4382d2SGreg Kroah-Hartman /* 951ab4382d2SGreg Kroah-Hartman * If we failed to restore the old settings, 952ab4382d2SGreg Kroah-Hartman * we fail like this. 953ab4382d2SGreg Kroah-Hartman */ 954ab4382d2SGreg Kroah-Hartman if (retval) 955ab4382d2SGreg Kroah-Hartman uport->type = PORT_UNKNOWN; 956ab4382d2SGreg Kroah-Hartman 957ab4382d2SGreg Kroah-Hartman /* 958ab4382d2SGreg Kroah-Hartman * We failed anyway. 959ab4382d2SGreg Kroah-Hartman */ 960ab4382d2SGreg Kroah-Hartman retval = -EBUSY; 9617deb39edSThomas Pfaff } 9627deb39edSThomas Pfaff 963ab4382d2SGreg Kroah-Hartman /* Added to return the correct error -Ram Gupta */ 964ab4382d2SGreg Kroah-Hartman goto exit; 965ab4382d2SGreg Kroah-Hartman } 966ab4382d2SGreg Kroah-Hartman } 967ab4382d2SGreg Kroah-Hartman 968ab4382d2SGreg Kroah-Hartman if (change_irq) 9697ba2e769SAlan Cox uport->irq = new_info->irq; 970ab4382d2SGreg Kroah-Hartman if (!(uport->flags & UPF_FIXED_PORT)) 9717ba2e769SAlan Cox uport->uartclk = new_info->baud_base * 16; 972ab4382d2SGreg Kroah-Hartman uport->flags = (uport->flags & ~UPF_CHANGE_MASK) | 973ab4382d2SGreg Kroah-Hartman (new_flags & UPF_CHANGE_MASK); 9747ba2e769SAlan Cox uport->custom_divisor = new_info->custom_divisor; 975ab4382d2SGreg Kroah-Hartman port->close_delay = close_delay; 976ab4382d2SGreg Kroah-Hartman port->closing_wait = closing_wait; 9777ba2e769SAlan Cox if (new_info->xmit_fifo_size) 9787ba2e769SAlan Cox uport->fifosize = new_info->xmit_fifo_size; 979d6c53c0eSJiri Slaby port->low_latency = (uport->flags & UPF_LOW_LATENCY) ? 1 : 0; 980ab4382d2SGreg Kroah-Hartman 981ab4382d2SGreg Kroah-Hartman check_and_exit: 982ab4382d2SGreg Kroah-Hartman retval = 0; 983ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) 984ab4382d2SGreg Kroah-Hartman goto exit; 985d41861caSPeter Hurley if (tty_port_initialized(port)) { 986ab4382d2SGreg Kroah-Hartman if (((old_flags ^ uport->flags) & UPF_SPD_MASK) || 987ab4382d2SGreg Kroah-Hartman old_custom_divisor != uport->custom_divisor) { 988ab4382d2SGreg Kroah-Hartman /* 989ab4382d2SGreg Kroah-Hartman * If they're setting up a custom divisor or speed, 990dc2f7271SJohan Hovold * instead of clearing it, then bitch about it. 991ab4382d2SGreg Kroah-Hartman */ 992ab4382d2SGreg Kroah-Hartman if (uport->flags & UPF_SPD_MASK) { 993dc2f7271SJohan Hovold dev_notice_ratelimited(uport->dev, 9942f2dafe7SSudip Mukherjee "%s sets custom speed on %s. This is deprecated.\n", 9952f2dafe7SSudip Mukherjee current->comm, 996429b4749SRasmus Villemoes tty_name(port->tty)); 997ab4382d2SGreg Kroah-Hartman } 998ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 999ab4382d2SGreg Kroah-Hartman } 1000b3b57646SRob Herring } else { 1001ab4382d2SGreg Kroah-Hartman retval = uart_startup(tty, state, 1); 100244117a1dSSebastian Andrzej Siewior if (retval == 0) 100344117a1dSSebastian Andrzej Siewior tty_port_set_initialized(port, true); 1004b3b57646SRob Herring if (retval > 0) 1005b3b57646SRob Herring retval = 0; 1006b3b57646SRob Herring } 1007ab4382d2SGreg Kroah-Hartman exit: 10087ba2e769SAlan Cox return retval; 10097ba2e769SAlan Cox } 10107ba2e769SAlan Cox 10115099d234SAl Viro static int uart_set_info_user(struct tty_struct *tty, struct serial_struct *ss) 10127ba2e769SAlan Cox { 10135099d234SAl Viro struct uart_state *state = tty->driver_data; 10147ba2e769SAlan Cox struct tty_port *port = &state->port; 10157ba2e769SAlan Cox int retval; 10167ba2e769SAlan Cox 10175099d234SAl Viro down_write(&tty->termios_rwsem); 10187ba2e769SAlan Cox /* 10197ba2e769SAlan Cox * This semaphore protects port->count. It is also 10207ba2e769SAlan Cox * very useful to prevent opens. Also, take the 10217ba2e769SAlan Cox * port configuration semaphore to make sure that a 10227ba2e769SAlan Cox * module insertion/removal doesn't change anything 10237ba2e769SAlan Cox * under us. 10247ba2e769SAlan Cox */ 10257ba2e769SAlan Cox mutex_lock(&port->mutex); 10265099d234SAl Viro retval = uart_set_info(tty, port, state, ss); 1027ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 10285099d234SAl Viro up_write(&tty->termios_rwsem); 1029ab4382d2SGreg Kroah-Hartman return retval; 1030ab4382d2SGreg Kroah-Hartman } 1031ab4382d2SGreg Kroah-Hartman 1032ab4382d2SGreg Kroah-Hartman /** 1033ab4382d2SGreg Kroah-Hartman * uart_get_lsr_info - get line status register info 1034ab4382d2SGreg Kroah-Hartman * @tty: tty associated with the UART 1035ab4382d2SGreg Kroah-Hartman * @state: UART being queried 1036ab4382d2SGreg Kroah-Hartman * @value: returned modem value 1037ab4382d2SGreg Kroah-Hartman */ 1038ab4382d2SGreg Kroah-Hartman static int uart_get_lsr_info(struct tty_struct *tty, 1039ab4382d2SGreg Kroah-Hartman struct uart_state *state, unsigned int __user *value) 1040ab4382d2SGreg Kroah-Hartman { 10414047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 1042ab4382d2SGreg Kroah-Hartman unsigned int result; 1043ab4382d2SGreg Kroah-Hartman 1044ab4382d2SGreg Kroah-Hartman result = uport->ops->tx_empty(uport); 1045ab4382d2SGreg Kroah-Hartman 1046ab4382d2SGreg Kroah-Hartman /* 1047ab4382d2SGreg Kroah-Hartman * If we're about to load something into the transmit 1048ab4382d2SGreg Kroah-Hartman * register, we'll pretend the transmitter isn't empty to 1049ab4382d2SGreg Kroah-Hartman * avoid a race condition (depending on when the transmit 1050ab4382d2SGreg Kroah-Hartman * interrupt happens). 1051ab4382d2SGreg Kroah-Hartman */ 1052ab4382d2SGreg Kroah-Hartman if (uport->x_char || 1053ab4382d2SGreg Kroah-Hartman ((uart_circ_chars_pending(&state->xmit) > 0) && 1054d01f4d18SPeter Hurley !uart_tx_stopped(uport))) 1055ab4382d2SGreg Kroah-Hartman result &= ~TIOCSER_TEMT; 1056ab4382d2SGreg Kroah-Hartman 1057ab4382d2SGreg Kroah-Hartman return put_user(result, value); 1058ab4382d2SGreg Kroah-Hartman } 1059ab4382d2SGreg Kroah-Hartman 106060b33c13SAlan Cox static int uart_tiocmget(struct tty_struct *tty) 1061ab4382d2SGreg Kroah-Hartman { 1062ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1063ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 10644047b371SPeter Hurley struct uart_port *uport; 1065ab4382d2SGreg Kroah-Hartman int result = -EIO; 1066ab4382d2SGreg Kroah-Hartman 1067ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 10684047b371SPeter Hurley uport = uart_port_check(state); 10694047b371SPeter Hurley if (!uport) 10704047b371SPeter Hurley goto out; 10714047b371SPeter Hurley 107218900ca6SPeter Hurley if (!tty_io_error(tty)) { 1073ab4382d2SGreg Kroah-Hartman result = uport->mctrl; 1074ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1075ab4382d2SGreg Kroah-Hartman result |= uport->ops->get_mctrl(uport); 1076ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1077ab4382d2SGreg Kroah-Hartman } 10784047b371SPeter Hurley out: 1079ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1080ab4382d2SGreg Kroah-Hartman return result; 1081ab4382d2SGreg Kroah-Hartman } 1082ab4382d2SGreg Kroah-Hartman 1083ab4382d2SGreg Kroah-Hartman static int 108420b9d177SAlan Cox uart_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear) 1085ab4382d2SGreg Kroah-Hartman { 1086ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1087ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 10884047b371SPeter Hurley struct uart_port *uport; 1089ab4382d2SGreg Kroah-Hartman int ret = -EIO; 1090ab4382d2SGreg Kroah-Hartman 1091ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 10924047b371SPeter Hurley uport = uart_port_check(state); 10934047b371SPeter Hurley if (!uport) 10944047b371SPeter Hurley goto out; 10954047b371SPeter Hurley 109618900ca6SPeter Hurley if (!tty_io_error(tty)) { 1097ab4382d2SGreg Kroah-Hartman uart_update_mctrl(uport, set, clear); 1098ab4382d2SGreg Kroah-Hartman ret = 0; 1099ab4382d2SGreg Kroah-Hartman } 11004047b371SPeter Hurley out: 1101ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1102ab4382d2SGreg Kroah-Hartman return ret; 1103ab4382d2SGreg Kroah-Hartman } 1104ab4382d2SGreg Kroah-Hartman 1105ab4382d2SGreg Kroah-Hartman static int uart_break_ctl(struct tty_struct *tty, int break_state) 1106ab4382d2SGreg Kroah-Hartman { 1107ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1108ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 11094047b371SPeter Hurley struct uart_port *uport; 11104047b371SPeter Hurley int ret = -EIO; 1111ab4382d2SGreg Kroah-Hartman 1112ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 11134047b371SPeter Hurley uport = uart_port_check(state); 11144047b371SPeter Hurley if (!uport) 11154047b371SPeter Hurley goto out; 1116ab4382d2SGreg Kroah-Hartman 11177d73170eSJiangfeng Xiao if (uport->type != PORT_UNKNOWN && uport->ops->break_ctl) 1118ab4382d2SGreg Kroah-Hartman uport->ops->break_ctl(uport, break_state); 11194047b371SPeter Hurley ret = 0; 11204047b371SPeter Hurley out: 1121ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 11224047b371SPeter Hurley return ret; 1123ab4382d2SGreg Kroah-Hartman } 1124ab4382d2SGreg Kroah-Hartman 1125ab4382d2SGreg Kroah-Hartman static int uart_do_autoconfig(struct tty_struct *tty,struct uart_state *state) 1126ab4382d2SGreg Kroah-Hartman { 1127ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 11284047b371SPeter Hurley struct uart_port *uport; 1129ab4382d2SGreg Kroah-Hartman int flags, ret; 1130ab4382d2SGreg Kroah-Hartman 1131ab4382d2SGreg Kroah-Hartman if (!capable(CAP_SYS_ADMIN)) 1132ab4382d2SGreg Kroah-Hartman return -EPERM; 1133ab4382d2SGreg Kroah-Hartman 1134ab4382d2SGreg Kroah-Hartman /* 1135ab4382d2SGreg Kroah-Hartman * Take the per-port semaphore. This prevents count from 1136ab4382d2SGreg Kroah-Hartman * changing, and hence any extra opens of the port while 1137ab4382d2SGreg Kroah-Hartman * we're auto-configuring. 1138ab4382d2SGreg Kroah-Hartman */ 1139ab4382d2SGreg Kroah-Hartman if (mutex_lock_interruptible(&port->mutex)) 1140ab4382d2SGreg Kroah-Hartman return -ERESTARTSYS; 1141ab4382d2SGreg Kroah-Hartman 11424047b371SPeter Hurley uport = uart_port_check(state); 11434047b371SPeter Hurley if (!uport) { 11444047b371SPeter Hurley ret = -EIO; 11454047b371SPeter Hurley goto out; 11464047b371SPeter Hurley } 11474047b371SPeter Hurley 1148ab4382d2SGreg Kroah-Hartman ret = -EBUSY; 1149ab4382d2SGreg Kroah-Hartman if (tty_port_users(port) == 1) { 1150ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 1151ab4382d2SGreg Kroah-Hartman 1152ab4382d2SGreg Kroah-Hartman /* 1153ab4382d2SGreg Kroah-Hartman * If we already have a port type configured, 1154ab4382d2SGreg Kroah-Hartman * we must release its resources. 1155ab4382d2SGreg Kroah-Hartman */ 1156a7cfaf16SFabio Estevam if (uport->type != PORT_UNKNOWN && uport->ops->release_port) 1157ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 1158ab4382d2SGreg Kroah-Hartman 1159ab4382d2SGreg Kroah-Hartman flags = UART_CONFIG_TYPE; 1160ab4382d2SGreg Kroah-Hartman if (uport->flags & UPF_AUTO_IRQ) 1161ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_IRQ; 1162ab4382d2SGreg Kroah-Hartman 1163ab4382d2SGreg Kroah-Hartman /* 1164ab4382d2SGreg Kroah-Hartman * This will claim the ports resources if 1165ab4382d2SGreg Kroah-Hartman * a port is found. 1166ab4382d2SGreg Kroah-Hartman */ 1167ab4382d2SGreg Kroah-Hartman uport->ops->config_port(uport, flags); 1168ab4382d2SGreg Kroah-Hartman 1169ab4382d2SGreg Kroah-Hartman ret = uart_startup(tty, state, 1); 117071456906SSebastian Andrzej Siewior if (ret == 0) 117171456906SSebastian Andrzej Siewior tty_port_set_initialized(port, true); 1172b3b57646SRob Herring if (ret > 0) 1173b3b57646SRob Herring ret = 0; 1174ab4382d2SGreg Kroah-Hartman } 11754047b371SPeter Hurley out: 1176ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1177ab4382d2SGreg Kroah-Hartman return ret; 1178ab4382d2SGreg Kroah-Hartman } 1179ab4382d2SGreg Kroah-Hartman 11801fdc3106SAlexander Shiyan static void uart_enable_ms(struct uart_port *uport) 11811fdc3106SAlexander Shiyan { 11821fdc3106SAlexander Shiyan /* 11831fdc3106SAlexander Shiyan * Force modem status interrupts on 11841fdc3106SAlexander Shiyan */ 11851fdc3106SAlexander Shiyan if (uport->ops->enable_ms) 11861fdc3106SAlexander Shiyan uport->ops->enable_ms(uport); 11871fdc3106SAlexander Shiyan } 11881fdc3106SAlexander Shiyan 1189ab4382d2SGreg Kroah-Hartman /* 1190ab4382d2SGreg Kroah-Hartman * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change 1191ab4382d2SGreg Kroah-Hartman * - mask passed in arg for lines of interest 1192ab4382d2SGreg Kroah-Hartman * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) 1193ab4382d2SGreg Kroah-Hartman * Caller should use TIOCGICOUNT to see which one it was 1194ab4382d2SGreg Kroah-Hartman * 1195ab4382d2SGreg Kroah-Hartman * FIXME: This wants extracting into a common all driver implementation 1196ab4382d2SGreg Kroah-Hartman * of TIOCMWAIT using tty_port. 1197ab4382d2SGreg Kroah-Hartman */ 11989ed19428SPeter Hurley static int uart_wait_modem_status(struct uart_state *state, unsigned long arg) 1199ab4382d2SGreg Kroah-Hartman { 12009ed19428SPeter Hurley struct uart_port *uport; 1201ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1202ab4382d2SGreg Kroah-Hartman DECLARE_WAITQUEUE(wait, current); 1203ab4382d2SGreg Kroah-Hartman struct uart_icount cprev, cnow; 1204ab4382d2SGreg Kroah-Hartman int ret; 1205ab4382d2SGreg Kroah-Hartman 1206ab4382d2SGreg Kroah-Hartman /* 1207ab4382d2SGreg Kroah-Hartman * note the counters on entry 1208ab4382d2SGreg Kroah-Hartman */ 12099ed19428SPeter Hurley uport = uart_port_ref(state); 12109ed19428SPeter Hurley if (!uport) 12119ed19428SPeter Hurley return -EIO; 1212ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1213ab4382d2SGreg Kroah-Hartman memcpy(&cprev, &uport->icount, sizeof(struct uart_icount)); 12141fdc3106SAlexander Shiyan uart_enable_ms(uport); 1215ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1216ab4382d2SGreg Kroah-Hartman 1217ab4382d2SGreg Kroah-Hartman add_wait_queue(&port->delta_msr_wait, &wait); 1218ab4382d2SGreg Kroah-Hartman for (;;) { 1219ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1220ab4382d2SGreg Kroah-Hartman memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); 1221ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1222ab4382d2SGreg Kroah-Hartman 1223ab4382d2SGreg Kroah-Hartman set_current_state(TASK_INTERRUPTIBLE); 1224ab4382d2SGreg Kroah-Hartman 1225ab4382d2SGreg Kroah-Hartman if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || 1226ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || 1227ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || 1228ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) { 1229ab4382d2SGreg Kroah-Hartman ret = 0; 1230ab4382d2SGreg Kroah-Hartman break; 1231ab4382d2SGreg Kroah-Hartman } 1232ab4382d2SGreg Kroah-Hartman 1233ab4382d2SGreg Kroah-Hartman schedule(); 1234ab4382d2SGreg Kroah-Hartman 1235ab4382d2SGreg Kroah-Hartman /* see if a signal did it */ 1236ab4382d2SGreg Kroah-Hartman if (signal_pending(current)) { 1237ab4382d2SGreg Kroah-Hartman ret = -ERESTARTSYS; 1238ab4382d2SGreg Kroah-Hartman break; 1239ab4382d2SGreg Kroah-Hartman } 1240ab4382d2SGreg Kroah-Hartman 1241ab4382d2SGreg Kroah-Hartman cprev = cnow; 1242ab4382d2SGreg Kroah-Hartman } 124397f9f707SFabian Frederick __set_current_state(TASK_RUNNING); 1244ab4382d2SGreg Kroah-Hartman remove_wait_queue(&port->delta_msr_wait, &wait); 12459ed19428SPeter Hurley uart_port_deref(uport); 1246ab4382d2SGreg Kroah-Hartman 1247ab4382d2SGreg Kroah-Hartman return ret; 1248ab4382d2SGreg Kroah-Hartman } 1249ab4382d2SGreg Kroah-Hartman 1250ab4382d2SGreg Kroah-Hartman /* 1251ab4382d2SGreg Kroah-Hartman * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) 1252ab4382d2SGreg Kroah-Hartman * Return: write counters to the user passed counter struct 1253ab4382d2SGreg Kroah-Hartman * NB: both 1->0 and 0->1 transitions are counted except for 1254ab4382d2SGreg Kroah-Hartman * RI where only 0->1 is counted. 1255ab4382d2SGreg Kroah-Hartman */ 1256ab4382d2SGreg Kroah-Hartman static int uart_get_icount(struct tty_struct *tty, 1257ab4382d2SGreg Kroah-Hartman struct serial_icounter_struct *icount) 1258ab4382d2SGreg Kroah-Hartman { 1259ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1260ab4382d2SGreg Kroah-Hartman struct uart_icount cnow; 12619ed19428SPeter Hurley struct uart_port *uport; 1262ab4382d2SGreg Kroah-Hartman 12639ed19428SPeter Hurley uport = uart_port_ref(state); 12649ed19428SPeter Hurley if (!uport) 12659ed19428SPeter Hurley return -EIO; 1266ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1267ab4382d2SGreg Kroah-Hartman memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); 1268ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 12699ed19428SPeter Hurley uart_port_deref(uport); 1270ab4382d2SGreg Kroah-Hartman 1271ab4382d2SGreg Kroah-Hartman icount->cts = cnow.cts; 1272ab4382d2SGreg Kroah-Hartman icount->dsr = cnow.dsr; 1273ab4382d2SGreg Kroah-Hartman icount->rng = cnow.rng; 1274ab4382d2SGreg Kroah-Hartman icount->dcd = cnow.dcd; 1275ab4382d2SGreg Kroah-Hartman icount->rx = cnow.rx; 1276ab4382d2SGreg Kroah-Hartman icount->tx = cnow.tx; 1277ab4382d2SGreg Kroah-Hartman icount->frame = cnow.frame; 1278ab4382d2SGreg Kroah-Hartman icount->overrun = cnow.overrun; 1279ab4382d2SGreg Kroah-Hartman icount->parity = cnow.parity; 1280ab4382d2SGreg Kroah-Hartman icount->brk = cnow.brk; 1281ab4382d2SGreg Kroah-Hartman icount->buf_overrun = cnow.buf_overrun; 1282ab4382d2SGreg Kroah-Hartman 1283ab4382d2SGreg Kroah-Hartman return 0; 1284ab4382d2SGreg Kroah-Hartman } 1285ab4382d2SGreg Kroah-Hartman 1286a5f276f1SRicardo Ribalda Delgado static int uart_get_rs485_config(struct uart_port *port, 1287a5f276f1SRicardo Ribalda Delgado struct serial_rs485 __user *rs485) 1288a5f276f1SRicardo Ribalda Delgado { 1289bd737f87SRicardo Ribalda Delgado unsigned long flags; 1290bd737f87SRicardo Ribalda Delgado struct serial_rs485 aux; 1291bd737f87SRicardo Ribalda Delgado 1292bd737f87SRicardo Ribalda Delgado spin_lock_irqsave(&port->lock, flags); 1293bd737f87SRicardo Ribalda Delgado aux = port->rs485; 1294bd737f87SRicardo Ribalda Delgado spin_unlock_irqrestore(&port->lock, flags); 1295bd737f87SRicardo Ribalda Delgado 1296bd737f87SRicardo Ribalda Delgado if (copy_to_user(rs485, &aux, sizeof(aux))) 1297a5f276f1SRicardo Ribalda Delgado return -EFAULT; 1298bd737f87SRicardo Ribalda Delgado 1299a5f276f1SRicardo Ribalda Delgado return 0; 1300a5f276f1SRicardo Ribalda Delgado } 1301a5f276f1SRicardo Ribalda Delgado 1302a5f276f1SRicardo Ribalda Delgado static int uart_set_rs485_config(struct uart_port *port, 1303a5f276f1SRicardo Ribalda Delgado struct serial_rs485 __user *rs485_user) 1304a5f276f1SRicardo Ribalda Delgado { 1305a5f276f1SRicardo Ribalda Delgado struct serial_rs485 rs485; 1306a5f276f1SRicardo Ribalda Delgado int ret; 1307bd737f87SRicardo Ribalda Delgado unsigned long flags; 1308a5f276f1SRicardo Ribalda Delgado 1309a5f276f1SRicardo Ribalda Delgado if (!port->rs485_config) 1310a5f276f1SRicardo Ribalda Delgado return -ENOIOCTLCMD; 1311a5f276f1SRicardo Ribalda Delgado 1312a5f276f1SRicardo Ribalda Delgado if (copy_from_user(&rs485, rs485_user, sizeof(*rs485_user))) 1313a5f276f1SRicardo Ribalda Delgado return -EFAULT; 1314a5f276f1SRicardo Ribalda Delgado 1315bd737f87SRicardo Ribalda Delgado spin_lock_irqsave(&port->lock, flags); 1316a5f276f1SRicardo Ribalda Delgado ret = port->rs485_config(port, &rs485); 1317bd737f87SRicardo Ribalda Delgado spin_unlock_irqrestore(&port->lock, flags); 1318a5f276f1SRicardo Ribalda Delgado if (ret) 1319a5f276f1SRicardo Ribalda Delgado return ret; 1320a5f276f1SRicardo Ribalda Delgado 1321a5f276f1SRicardo Ribalda Delgado if (copy_to_user(rs485_user, &port->rs485, sizeof(port->rs485))) 1322a5f276f1SRicardo Ribalda Delgado return -EFAULT; 1323a5f276f1SRicardo Ribalda Delgado 1324a5f276f1SRicardo Ribalda Delgado return 0; 1325a5f276f1SRicardo Ribalda Delgado } 1326a5f276f1SRicardo Ribalda Delgado 1327ad8c0eaaSNicolas Ferre static int uart_get_iso7816_config(struct uart_port *port, 1328ad8c0eaaSNicolas Ferre struct serial_iso7816 __user *iso7816) 1329ad8c0eaaSNicolas Ferre { 1330ad8c0eaaSNicolas Ferre unsigned long flags; 1331ad8c0eaaSNicolas Ferre struct serial_iso7816 aux; 1332ad8c0eaaSNicolas Ferre 1333ad8c0eaaSNicolas Ferre if (!port->iso7816_config) 1334ad8c0eaaSNicolas Ferre return -ENOIOCTLCMD; 1335ad8c0eaaSNicolas Ferre 1336ad8c0eaaSNicolas Ferre spin_lock_irqsave(&port->lock, flags); 1337ad8c0eaaSNicolas Ferre aux = port->iso7816; 1338ad8c0eaaSNicolas Ferre spin_unlock_irqrestore(&port->lock, flags); 1339ad8c0eaaSNicolas Ferre 1340ad8c0eaaSNicolas Ferre if (copy_to_user(iso7816, &aux, sizeof(aux))) 1341ad8c0eaaSNicolas Ferre return -EFAULT; 1342ad8c0eaaSNicolas Ferre 1343ad8c0eaaSNicolas Ferre return 0; 1344ad8c0eaaSNicolas Ferre } 1345ad8c0eaaSNicolas Ferre 1346ad8c0eaaSNicolas Ferre static int uart_set_iso7816_config(struct uart_port *port, 1347ad8c0eaaSNicolas Ferre struct serial_iso7816 __user *iso7816_user) 1348ad8c0eaaSNicolas Ferre { 1349ad8c0eaaSNicolas Ferre struct serial_iso7816 iso7816; 1350ad8c0eaaSNicolas Ferre int i, ret; 1351ad8c0eaaSNicolas Ferre unsigned long flags; 1352ad8c0eaaSNicolas Ferre 1353ad8c0eaaSNicolas Ferre if (!port->iso7816_config) 1354ad8c0eaaSNicolas Ferre return -ENOIOCTLCMD; 1355ad8c0eaaSNicolas Ferre 1356ad8c0eaaSNicolas Ferre if (copy_from_user(&iso7816, iso7816_user, sizeof(*iso7816_user))) 1357ad8c0eaaSNicolas Ferre return -EFAULT; 1358ad8c0eaaSNicolas Ferre 1359ad8c0eaaSNicolas Ferre /* 1360ad8c0eaaSNicolas Ferre * There are 5 words reserved for future use. Check that userspace 1361ad8c0eaaSNicolas Ferre * doesn't put stuff in there to prevent breakages in the future. 1362ad8c0eaaSNicolas Ferre */ 1363ad8c0eaaSNicolas Ferre for (i = 0; i < 5; i++) 1364ad8c0eaaSNicolas Ferre if (iso7816.reserved[i]) 1365ad8c0eaaSNicolas Ferre return -EINVAL; 1366ad8c0eaaSNicolas Ferre 1367ad8c0eaaSNicolas Ferre spin_lock_irqsave(&port->lock, flags); 1368ad8c0eaaSNicolas Ferre ret = port->iso7816_config(port, &iso7816); 1369ad8c0eaaSNicolas Ferre spin_unlock_irqrestore(&port->lock, flags); 1370ad8c0eaaSNicolas Ferre if (ret) 1371ad8c0eaaSNicolas Ferre return ret; 1372ad8c0eaaSNicolas Ferre 1373ad8c0eaaSNicolas Ferre if (copy_to_user(iso7816_user, &port->iso7816, sizeof(port->iso7816))) 1374ad8c0eaaSNicolas Ferre return -EFAULT; 1375ad8c0eaaSNicolas Ferre 1376ad8c0eaaSNicolas Ferre return 0; 1377ad8c0eaaSNicolas Ferre } 1378ad8c0eaaSNicolas Ferre 1379ab4382d2SGreg Kroah-Hartman /* 1380ab4382d2SGreg Kroah-Hartman * Called via sys_ioctl. We can use spin_lock_irq() here. 1381ab4382d2SGreg Kroah-Hartman */ 1382ab4382d2SGreg Kroah-Hartman static int 13834047b371SPeter Hurley uart_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg) 1384ab4382d2SGreg Kroah-Hartman { 1385ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1386ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 13874047b371SPeter Hurley struct uart_port *uport; 1388ab4382d2SGreg Kroah-Hartman void __user *uarg = (void __user *)arg; 1389ab4382d2SGreg Kroah-Hartman int ret = -ENOIOCTLCMD; 1390ab4382d2SGreg Kroah-Hartman 1391ab4382d2SGreg Kroah-Hartman 1392ab4382d2SGreg Kroah-Hartman /* 1393ab4382d2SGreg Kroah-Hartman * These ioctls don't rely on the hardware to be present. 1394ab4382d2SGreg Kroah-Hartman */ 1395ab4382d2SGreg Kroah-Hartman switch (cmd) { 1396ab4382d2SGreg Kroah-Hartman case TIOCSERCONFIG: 13977c8ab967SPeter Hurley down_write(&tty->termios_rwsem); 1398ab4382d2SGreg Kroah-Hartman ret = uart_do_autoconfig(tty, state); 13997c8ab967SPeter Hurley up_write(&tty->termios_rwsem); 1400ab4382d2SGreg Kroah-Hartman break; 1401ab4382d2SGreg Kroah-Hartman } 1402ab4382d2SGreg Kroah-Hartman 1403ab4382d2SGreg Kroah-Hartman if (ret != -ENOIOCTLCMD) 1404ab4382d2SGreg Kroah-Hartman goto out; 1405ab4382d2SGreg Kroah-Hartman 140618900ca6SPeter Hurley if (tty_io_error(tty)) { 1407ab4382d2SGreg Kroah-Hartman ret = -EIO; 1408ab4382d2SGreg Kroah-Hartman goto out; 1409ab4382d2SGreg Kroah-Hartman } 1410ab4382d2SGreg Kroah-Hartman 1411ab4382d2SGreg Kroah-Hartman /* 1412ab4382d2SGreg Kroah-Hartman * The following should only be used when hardware is present. 1413ab4382d2SGreg Kroah-Hartman */ 1414ab4382d2SGreg Kroah-Hartman switch (cmd) { 1415ab4382d2SGreg Kroah-Hartman case TIOCMIWAIT: 1416ab4382d2SGreg Kroah-Hartman ret = uart_wait_modem_status(state, arg); 1417ab4382d2SGreg Kroah-Hartman break; 1418ab4382d2SGreg Kroah-Hartman } 1419ab4382d2SGreg Kroah-Hartman 1420ab4382d2SGreg Kroah-Hartman if (ret != -ENOIOCTLCMD) 1421ab4382d2SGreg Kroah-Hartman goto out; 1422ab4382d2SGreg Kroah-Hartman 1423ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 14244047b371SPeter Hurley uport = uart_port_check(state); 1425ab4382d2SGreg Kroah-Hartman 14264047b371SPeter Hurley if (!uport || tty_io_error(tty)) { 1427ab4382d2SGreg Kroah-Hartman ret = -EIO; 1428ab4382d2SGreg Kroah-Hartman goto out_up; 1429ab4382d2SGreg Kroah-Hartman } 1430ab4382d2SGreg Kroah-Hartman 1431ab4382d2SGreg Kroah-Hartman /* 1432ab4382d2SGreg Kroah-Hartman * All these rely on hardware being present and need to be 1433ab4382d2SGreg Kroah-Hartman * protected against the tty being hung up. 1434ab4382d2SGreg Kroah-Hartman */ 1435a9c20a9cSRicardo Ribalda Delgado 1436ab4382d2SGreg Kroah-Hartman switch (cmd) { 1437a9c20a9cSRicardo Ribalda Delgado case TIOCSERGETLSR: /* Get line status register */ 1438a9c20a9cSRicardo Ribalda Delgado ret = uart_get_lsr_info(tty, state, uarg); 1439a9c20a9cSRicardo Ribalda Delgado break; 1440a9c20a9cSRicardo Ribalda Delgado 1441a5f276f1SRicardo Ribalda Delgado case TIOCGRS485: 14424047b371SPeter Hurley ret = uart_get_rs485_config(uport, uarg); 1443a5f276f1SRicardo Ribalda Delgado break; 1444a5f276f1SRicardo Ribalda Delgado 1445a5f276f1SRicardo Ribalda Delgado case TIOCSRS485: 14464047b371SPeter Hurley ret = uart_set_rs485_config(uport, uarg); 1447a5f276f1SRicardo Ribalda Delgado break; 1448ad8c0eaaSNicolas Ferre 1449ad8c0eaaSNicolas Ferre case TIOCSISO7816: 1450ad8c0eaaSNicolas Ferre ret = uart_set_iso7816_config(state->uart_port, uarg); 1451ad8c0eaaSNicolas Ferre break; 1452ad8c0eaaSNicolas Ferre 1453ad8c0eaaSNicolas Ferre case TIOCGISO7816: 1454ad8c0eaaSNicolas Ferre ret = uart_get_iso7816_config(state->uart_port, uarg); 1455ad8c0eaaSNicolas Ferre break; 14564047b371SPeter Hurley default: 1457ab4382d2SGreg Kroah-Hartman if (uport->ops->ioctl) 1458ab4382d2SGreg Kroah-Hartman ret = uport->ops->ioctl(uport, cmd, arg); 1459ab4382d2SGreg Kroah-Hartman break; 1460ab4382d2SGreg Kroah-Hartman } 1461ab4382d2SGreg Kroah-Hartman out_up: 1462ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1463ab4382d2SGreg Kroah-Hartman out: 1464ab4382d2SGreg Kroah-Hartman return ret; 1465ab4382d2SGreg Kroah-Hartman } 1466ab4382d2SGreg Kroah-Hartman 1467ab4382d2SGreg Kroah-Hartman static void uart_set_ldisc(struct tty_struct *tty) 1468ab4382d2SGreg Kroah-Hartman { 1469ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 14704047b371SPeter Hurley struct uart_port *uport; 1471ab4382d2SGreg Kroah-Hartman 1472db1b9dfcSPeter Hurley mutex_lock(&state->port.mutex); 14734047b371SPeter Hurley uport = uart_port_check(state); 14744047b371SPeter Hurley if (uport && uport->ops->set_ldisc) 1475732a84a0SPeter Hurley uport->ops->set_ldisc(uport, &tty->termios); 1476db1b9dfcSPeter Hurley mutex_unlock(&state->port.mutex); 1477db1b9dfcSPeter Hurley } 1478ab4382d2SGreg Kroah-Hartman 1479ab4382d2SGreg Kroah-Hartman static void uart_set_termios(struct tty_struct *tty, 1480ab4382d2SGreg Kroah-Hartman struct ktermios *old_termios) 1481ab4382d2SGreg Kroah-Hartman { 1482ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 14834047b371SPeter Hurley struct uart_port *uport; 1484adc8d746SAlan Cox unsigned int cflag = tty->termios.c_cflag; 14852cbacafdSRussell King unsigned int iflag_mask = IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK; 14862cbacafdSRussell King bool sw_changed = false; 1487ab4382d2SGreg Kroah-Hartman 14884047b371SPeter Hurley mutex_lock(&state->port.mutex); 14894047b371SPeter Hurley uport = uart_port_check(state); 14904047b371SPeter Hurley if (!uport) 14914047b371SPeter Hurley goto out; 14924047b371SPeter Hurley 14932cbacafdSRussell King /* 14942cbacafdSRussell King * Drivers doing software flow control also need to know 14952cbacafdSRussell King * about changes to these input settings. 14962cbacafdSRussell King */ 14972cbacafdSRussell King if (uport->flags & UPF_SOFT_FLOW) { 14982cbacafdSRussell King iflag_mask |= IXANY|IXON|IXOFF; 14992cbacafdSRussell King sw_changed = 15002cbacafdSRussell King tty->termios.c_cc[VSTART] != old_termios->c_cc[VSTART] || 15012cbacafdSRussell King tty->termios.c_cc[VSTOP] != old_termios->c_cc[VSTOP]; 15022cbacafdSRussell King } 1503ab4382d2SGreg Kroah-Hartman 1504ab4382d2SGreg Kroah-Hartman /* 1505ab4382d2SGreg Kroah-Hartman * These are the bits that are used to setup various 1506ab4382d2SGreg Kroah-Hartman * flags in the low level driver. We can ignore the Bfoo 1507ab4382d2SGreg Kroah-Hartman * bits in c_cflag; c_[io]speed will always be set 1508ab4382d2SGreg Kroah-Hartman * appropriately by set_termios() in tty_ioctl.c 1509ab4382d2SGreg Kroah-Hartman */ 1510ab4382d2SGreg Kroah-Hartman if ((cflag ^ old_termios->c_cflag) == 0 && 1511adc8d746SAlan Cox tty->termios.c_ospeed == old_termios->c_ospeed && 1512adc8d746SAlan Cox tty->termios.c_ispeed == old_termios->c_ispeed && 15132cbacafdSRussell King ((tty->termios.c_iflag ^ old_termios->c_iflag) & iflag_mask) == 0 && 15142cbacafdSRussell King !sw_changed) { 15154047b371SPeter Hurley goto out; 1516ab4382d2SGreg Kroah-Hartman } 1517ab4382d2SGreg Kroah-Hartman 1518ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, old_termios); 1519c7a6b9e4SHariprasad Kelam /* reload cflag from termios; port driver may have overridden flags */ 1520c18b55fdSPeter Hurley cflag = tty->termios.c_cflag; 1521ab4382d2SGreg Kroah-Hartman 1522ab4382d2SGreg Kroah-Hartman /* Handle transition to B0 status */ 1523ab4382d2SGreg Kroah-Hartman if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) 1524dec94e70SRussell King uart_clear_mctrl(uport, TIOCM_RTS | TIOCM_DTR); 1525ab4382d2SGreg Kroah-Hartman /* Handle transition away from B0 status */ 1526ab4382d2SGreg Kroah-Hartman else if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { 1527ab4382d2SGreg Kroah-Hartman unsigned int mask = TIOCM_DTR; 152897ef38b8SPeter Hurley if (!(cflag & CRTSCTS) || !tty_throttled(tty)) 1529ab4382d2SGreg Kroah-Hartman mask |= TIOCM_RTS; 1530dec94e70SRussell King uart_set_mctrl(uport, mask); 1531ab4382d2SGreg Kroah-Hartman } 15324047b371SPeter Hurley out: 15334047b371SPeter Hurley mutex_unlock(&state->port.mutex); 1534ab4382d2SGreg Kroah-Hartman } 1535ab4382d2SGreg Kroah-Hartman 1536ab4382d2SGreg Kroah-Hartman /* 1537ef4f527cSKevin Cernekee * Calls to uart_close() are serialised via the tty_lock in 1538ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:tty_release() 1539ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:do_tty_hangup() 1540ab4382d2SGreg Kroah-Hartman */ 1541ab4382d2SGreg Kroah-Hartman static void uart_close(struct tty_struct *tty, struct file *filp) 1542ab4382d2SGreg Kroah-Hartman { 1543ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1544ab4382d2SGreg Kroah-Hartman 154591b32f54SPeter Hurley if (!state) { 154691b32f54SPeter Hurley struct uart_driver *drv = tty->driver->driver_state; 15479356335fSColin Ian King struct tty_port *port; 154891b32f54SPeter Hurley 154991b32f54SPeter Hurley state = drv->state + tty->index; 155091b32f54SPeter Hurley port = &state->port; 155191b32f54SPeter Hurley spin_lock_irq(&port->lock); 155291b32f54SPeter Hurley --port->count; 155391b32f54SPeter Hurley spin_unlock_irq(&port->lock); 1554ab4382d2SGreg Kroah-Hartman return; 155591b32f54SPeter Hurley } 1556ab4382d2SGreg Kroah-Hartman 155739b3d892SPeter Hurley pr_debug("uart_close(%d) called\n", tty->index); 1558ab4382d2SGreg Kroah-Hartman 1559761ed4a9SRob Herring tty_port_close(tty->port, tty, filp); 1560761ed4a9SRob Herring } 1561ab4382d2SGreg Kroah-Hartman 1562761ed4a9SRob Herring static void uart_tty_port_shutdown(struct tty_port *port) 1563761ed4a9SRob Herring { 1564761ed4a9SRob Herring struct uart_state *state = container_of(port, struct uart_state, port); 1565761ed4a9SRob Herring struct uart_port *uport = uart_port_check(state); 1566af224ca2SPeter Hurley 1567ab4382d2SGreg Kroah-Hartman /* 1568ab4382d2SGreg Kroah-Hartman * At this point, we stop accepting input. To do this, we 1569ab4382d2SGreg Kroah-Hartman * disable the receive line status interrupts. 1570ab4382d2SGreg Kroah-Hartman */ 1571a5a2b130SAndy Shevchenko if (WARN(!uport, "detached port still initialized!\n")) 1572a5a2b130SAndy Shevchenko return; 1573761ed4a9SRob Herring 1574a5a2b130SAndy Shevchenko spin_lock_irq(&uport->lock); 1575ab4382d2SGreg Kroah-Hartman uport->ops->stop_rx(uport); 15766fb98fb3SPeter Hurley spin_unlock_irq(&uport->lock); 1577761ed4a9SRob Herring 1578761ed4a9SRob Herring uart_port_shutdown(port); 1579761ed4a9SRob Herring 1580ab4382d2SGreg Kroah-Hartman /* 1581761ed4a9SRob Herring * It's possible for shutdown to be called after suspend if we get 1582761ed4a9SRob Herring * a DCD drop (hangup) at just the right time. Clear suspended bit so 1583761ed4a9SRob Herring * we don't try to resume a port that has been shutdown. 1584ab4382d2SGreg Kroah-Hartman */ 1585761ed4a9SRob Herring tty_port_set_suspended(port, 0); 1586ab4382d2SGreg Kroah-Hartman 15876f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_OFF); 1588ab4382d2SGreg Kroah-Hartman 1589ab4382d2SGreg Kroah-Hartman } 1590ab4382d2SGreg Kroah-Hartman 15911f33a51dSJiri Slaby static void uart_wait_until_sent(struct tty_struct *tty, int timeout) 1592ab4382d2SGreg Kroah-Hartman { 15931f33a51dSJiri Slaby struct uart_state *state = tty->driver_data; 15949ed19428SPeter Hurley struct uart_port *port; 1595ab4382d2SGreg Kroah-Hartman unsigned long char_time, expire; 1596ab4382d2SGreg Kroah-Hartman 15979ed19428SPeter Hurley port = uart_port_ref(state); 1598ef510beaSAndy Shevchenko if (!port) 1599ef510beaSAndy Shevchenko return; 1600ef510beaSAndy Shevchenko 1601ef510beaSAndy Shevchenko if (port->type == PORT_UNKNOWN || port->fifosize == 0) { 16029ed19428SPeter Hurley uart_port_deref(port); 1603ab4382d2SGreg Kroah-Hartman return; 16049ed19428SPeter Hurley } 1605ab4382d2SGreg Kroah-Hartman 1606ab4382d2SGreg Kroah-Hartman /* 1607ab4382d2SGreg Kroah-Hartman * Set the check interval to be 1/5 of the estimated time to 1608ab4382d2SGreg Kroah-Hartman * send a single character, and make it at least 1. The check 1609ab4382d2SGreg Kroah-Hartman * interval should also be less than the timeout. 1610ab4382d2SGreg Kroah-Hartman * 1611ab4382d2SGreg Kroah-Hartman * Note: we have to use pretty tight timings here to satisfy 1612ab4382d2SGreg Kroah-Hartman * the NIST-PCTS. 1613ab4382d2SGreg Kroah-Hartman */ 1614ab4382d2SGreg Kroah-Hartman char_time = (port->timeout - HZ/50) / port->fifosize; 1615ab4382d2SGreg Kroah-Hartman char_time = char_time / 5; 1616ab4382d2SGreg Kroah-Hartman if (char_time == 0) 1617ab4382d2SGreg Kroah-Hartman char_time = 1; 1618ab4382d2SGreg Kroah-Hartman if (timeout && timeout < char_time) 1619ab4382d2SGreg Kroah-Hartman char_time = timeout; 1620ab4382d2SGreg Kroah-Hartman 1621ab4382d2SGreg Kroah-Hartman /* 1622ab4382d2SGreg Kroah-Hartman * If the transmitter hasn't cleared in twice the approximate 1623ab4382d2SGreg Kroah-Hartman * amount of time to send the entire FIFO, it probably won't 1624ab4382d2SGreg Kroah-Hartman * ever clear. This assumes the UART isn't doing flow 1625ab4382d2SGreg Kroah-Hartman * control, which is currently the case. Hence, if it ever 1626ab4382d2SGreg Kroah-Hartman * takes longer than port->timeout, this is probably due to a 1627ab4382d2SGreg Kroah-Hartman * UART bug of some kind. So, we clamp the timeout parameter at 1628ab4382d2SGreg Kroah-Hartman * 2*port->timeout. 1629ab4382d2SGreg Kroah-Hartman */ 1630ab4382d2SGreg Kroah-Hartman if (timeout == 0 || timeout > 2 * port->timeout) 1631ab4382d2SGreg Kroah-Hartman timeout = 2 * port->timeout; 1632ab4382d2SGreg Kroah-Hartman 1633ab4382d2SGreg Kroah-Hartman expire = jiffies + timeout; 1634ab4382d2SGreg Kroah-Hartman 1635ab4382d2SGreg Kroah-Hartman pr_debug("uart_wait_until_sent(%d), jiffies=%lu, expire=%lu...\n", 1636ab4382d2SGreg Kroah-Hartman port->line, jiffies, expire); 1637ab4382d2SGreg Kroah-Hartman 1638ab4382d2SGreg Kroah-Hartman /* 1639ab4382d2SGreg Kroah-Hartman * Check whether the transmitter is empty every 'char_time'. 1640ab4382d2SGreg Kroah-Hartman * 'timeout' / 'expire' give us the maximum amount of time 1641ab4382d2SGreg Kroah-Hartman * we wait. 1642ab4382d2SGreg Kroah-Hartman */ 1643ab4382d2SGreg Kroah-Hartman while (!port->ops->tx_empty(port)) { 1644ab4382d2SGreg Kroah-Hartman msleep_interruptible(jiffies_to_msecs(char_time)); 1645ab4382d2SGreg Kroah-Hartman if (signal_pending(current)) 1646ab4382d2SGreg Kroah-Hartman break; 1647ab4382d2SGreg Kroah-Hartman if (time_after(jiffies, expire)) 1648ab4382d2SGreg Kroah-Hartman break; 1649ab4382d2SGreg Kroah-Hartman } 16509ed19428SPeter Hurley uart_port_deref(port); 1651ab4382d2SGreg Kroah-Hartman } 1652ab4382d2SGreg Kroah-Hartman 1653ab4382d2SGreg Kroah-Hartman /* 1654ef4f527cSKevin Cernekee * Calls to uart_hangup() are serialised by the tty_lock in 1655ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:do_tty_hangup() 1656ef4f527cSKevin Cernekee * This runs from a workqueue and can sleep for a _short_ time only. 1657ab4382d2SGreg Kroah-Hartman */ 1658ab4382d2SGreg Kroah-Hartman static void uart_hangup(struct tty_struct *tty) 1659ab4382d2SGreg Kroah-Hartman { 1660ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1661ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1662af224ca2SPeter Hurley struct uart_port *uport; 1663ab4382d2SGreg Kroah-Hartman unsigned long flags; 1664ab4382d2SGreg Kroah-Hartman 166539b3d892SPeter Hurley pr_debug("uart_hangup(%d)\n", tty->index); 1666ab4382d2SGreg Kroah-Hartman 1667ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1668af224ca2SPeter Hurley uport = uart_port_check(state); 1669af224ca2SPeter Hurley WARN(!uport, "hangup of detached port!\n"); 1670af224ca2SPeter Hurley 1671807c8d81SPeter Hurley if (tty_port_active(port)) { 1672ab4382d2SGreg Kroah-Hartman uart_flush_buffer(tty); 1673ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 1674ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 1675ab4382d2SGreg Kroah-Hartman port->count = 0; 1676ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 1677807c8d81SPeter Hurley tty_port_set_active(port, 0); 1678ab4382d2SGreg Kroah-Hartman tty_port_tty_set(port, NULL); 1679af224ca2SPeter Hurley if (uport && !uart_console(uport)) 1680bf903c0cSGeert Uytterhoeven uart_change_pm(state, UART_PM_STATE_OFF); 1681ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->open_wait); 1682ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->delta_msr_wait); 1683ab4382d2SGreg Kroah-Hartman } 1684ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1685ab4382d2SGreg Kroah-Hartman } 1686ab4382d2SGreg Kroah-Hartman 1687af224ca2SPeter Hurley /* uport == NULL if uart_port has already been removed */ 16880b1db830SJiri Slaby static void uart_port_shutdown(struct tty_port *port) 16890b1db830SJiri Slaby { 1690b922e19dSJiri Slaby struct uart_state *state = container_of(port, struct uart_state, port); 16914047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 1692b922e19dSJiri Slaby 1693b922e19dSJiri Slaby /* 1694b922e19dSJiri Slaby * clear delta_msr_wait queue to avoid mem leaks: we may free 1695b922e19dSJiri Slaby * the irq here so the queue might never be woken up. Note 1696b922e19dSJiri Slaby * that we won't end up waiting on delta_msr_wait again since 1697b922e19dSJiri Slaby * any outstanding file descriptors should be pointing at 1698b922e19dSJiri Slaby * hung_up_tty_fops now. 1699b922e19dSJiri Slaby */ 1700b922e19dSJiri Slaby wake_up_interruptible(&port->delta_msr_wait); 1701b922e19dSJiri Slaby 1702b922e19dSJiri Slaby /* 1703b922e19dSJiri Slaby * Free the IRQ and disable the port. 1704b922e19dSJiri Slaby */ 1705af224ca2SPeter Hurley if (uport) 1706b922e19dSJiri Slaby uport->ops->shutdown(uport); 1707b922e19dSJiri Slaby 1708b922e19dSJiri Slaby /* 1709b922e19dSJiri Slaby * Ensure that the IRQ handler isn't running on another CPU. 1710b922e19dSJiri Slaby */ 1711af224ca2SPeter Hurley if (uport) 1712b922e19dSJiri Slaby synchronize_irq(uport->irq); 17130b1db830SJiri Slaby } 17140b1db830SJiri Slaby 1715ab4382d2SGreg Kroah-Hartman static int uart_carrier_raised(struct tty_port *port) 1716ab4382d2SGreg Kroah-Hartman { 1717ab4382d2SGreg Kroah-Hartman struct uart_state *state = container_of(port, struct uart_state, port); 17189ed19428SPeter Hurley struct uart_port *uport; 1719ab4382d2SGreg Kroah-Hartman int mctrl; 17209ed19428SPeter Hurley 17219ed19428SPeter Hurley uport = uart_port_ref(state); 17229ed19428SPeter Hurley /* 17239ed19428SPeter Hurley * Should never observe uport == NULL since checks for hangup should 17249ed19428SPeter Hurley * abort the tty_port_block_til_ready() loop before checking for carrier 17259ed19428SPeter Hurley * raised -- but report carrier raised if it does anyway so open will 17269ed19428SPeter Hurley * continue and not sleep 17279ed19428SPeter Hurley */ 17289ed19428SPeter Hurley if (WARN_ON(!uport)) 17299ed19428SPeter Hurley return 1; 1730ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 17311fdc3106SAlexander Shiyan uart_enable_ms(uport); 1732ab4382d2SGreg Kroah-Hartman mctrl = uport->ops->get_mctrl(uport); 1733ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 17349ed19428SPeter Hurley uart_port_deref(uport); 1735ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_CAR) 1736ab4382d2SGreg Kroah-Hartman return 1; 1737ab4382d2SGreg Kroah-Hartman return 0; 1738ab4382d2SGreg Kroah-Hartman } 1739ab4382d2SGreg Kroah-Hartman 1740a6845e1eSRafael Gago static void uart_dtr_rts(struct tty_port *port, int raise) 1741ab4382d2SGreg Kroah-Hartman { 1742ab4382d2SGreg Kroah-Hartman struct uart_state *state = container_of(port, struct uart_state, port); 17439ed19428SPeter Hurley struct uart_port *uport; 17449ed19428SPeter Hurley 17459ed19428SPeter Hurley uport = uart_port_ref(state); 17469ed19428SPeter Hurley if (!uport) 17479ed19428SPeter Hurley return; 1748a6845e1eSRafael Gago uart_port_dtr_rts(uport, raise); 17499ed19428SPeter Hurley uart_port_deref(uport); 1750ab4382d2SGreg Kroah-Hartman } 1751ab4382d2SGreg Kroah-Hartman 17524cdd17baSJiri Slaby static int uart_install(struct tty_driver *driver, struct tty_struct *tty) 17534cdd17baSJiri Slaby { 17544cdd17baSJiri Slaby struct uart_driver *drv = driver->driver_state; 17554cdd17baSJiri Slaby struct uart_state *state = drv->state + tty->index; 17564cdd17baSJiri Slaby 17574cdd17baSJiri Slaby tty->driver_data = state; 17584cdd17baSJiri Slaby 17594cdd17baSJiri Slaby return tty_standard_install(driver, tty); 17604cdd17baSJiri Slaby } 17614cdd17baSJiri Slaby 1762ab4382d2SGreg Kroah-Hartman /* 1763ef4f527cSKevin Cernekee * Calls to uart_open are serialised by the tty_lock in 1764ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:tty_open() 1765ab4382d2SGreg Kroah-Hartman * Note that if this fails, then uart_close() _will_ be called. 1766ab4382d2SGreg Kroah-Hartman * 1767ab4382d2SGreg Kroah-Hartman * In time, we want to scrap the "opening nonpresent ports" 1768ab4382d2SGreg Kroah-Hartman * behaviour and implement an alternative way for setserial 1769ab4382d2SGreg Kroah-Hartman * to set base addresses/ports/types. This will allow us to 1770ab4382d2SGreg Kroah-Hartman * get rid of a certain amount of extra tests. 1771ab4382d2SGreg Kroah-Hartman */ 1772ab4382d2SGreg Kroah-Hartman static int uart_open(struct tty_struct *tty, struct file *filp) 1773ab4382d2SGreg Kroah-Hartman { 17744cdd17baSJiri Slaby struct uart_state *state = tty->driver_data; 17754cdd17baSJiri Slaby int retval; 1776b3b57646SRob Herring 1777b3b57646SRob Herring retval = tty_port_open(&state->port, tty, filp); 1778b3b57646SRob Herring if (retval > 0) 1779b3b57646SRob Herring retval = 0; 1780b3b57646SRob Herring 1781b3b57646SRob Herring return retval; 1782b3b57646SRob Herring } 1783b3b57646SRob Herring 1784b3b57646SRob Herring static int uart_port_activate(struct tty_port *port, struct tty_struct *tty) 1785b3b57646SRob Herring { 1786b3b57646SRob Herring struct uart_state *state = container_of(port, struct uart_state, port); 1787b3b57646SRob Herring struct uart_port *uport; 178813b18d35SSerge Semin int ret; 1789b3b57646SRob Herring 1790b3b57646SRob Herring uport = uart_port_check(state); 1791b3b57646SRob Herring if (!uport || uport->flags & UPF_DEAD) 1792b3b57646SRob Herring return -ENXIO; 1793b3b57646SRob Herring 17944047b371SPeter Hurley port->low_latency = (uport->flags & UPF_LOW_LATENCY) ? 1 : 0; 1795ab4382d2SGreg Kroah-Hartman 1796ab4382d2SGreg Kroah-Hartman /* 1797ab4382d2SGreg Kroah-Hartman * Start up the serial port. 1798ab4382d2SGreg Kroah-Hartman */ 179913b18d35SSerge Semin ret = uart_startup(tty, state, 0); 180013b18d35SSerge Semin if (ret > 0) 180113b18d35SSerge Semin tty_port_set_active(port, 1); 180213b18d35SSerge Semin 180313b18d35SSerge Semin return ret; 1804ab4382d2SGreg Kroah-Hartman } 1805ab4382d2SGreg Kroah-Hartman 1806ab4382d2SGreg Kroah-Hartman static const char *uart_type(struct uart_port *port) 1807ab4382d2SGreg Kroah-Hartman { 1808ab4382d2SGreg Kroah-Hartman const char *str = NULL; 1809ab4382d2SGreg Kroah-Hartman 1810ab4382d2SGreg Kroah-Hartman if (port->ops->type) 1811ab4382d2SGreg Kroah-Hartman str = port->ops->type(port); 1812ab4382d2SGreg Kroah-Hartman 1813ab4382d2SGreg Kroah-Hartman if (!str) 1814ab4382d2SGreg Kroah-Hartman str = "unknown"; 1815ab4382d2SGreg Kroah-Hartman 1816ab4382d2SGreg Kroah-Hartman return str; 1817ab4382d2SGreg Kroah-Hartman } 1818ab4382d2SGreg Kroah-Hartman 1819ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_PROC_FS 1820ab4382d2SGreg Kroah-Hartman 1821ab4382d2SGreg Kroah-Hartman static void uart_line_info(struct seq_file *m, struct uart_driver *drv, int i) 1822ab4382d2SGreg Kroah-Hartman { 1823ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + i; 1824ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 18256f538fe3SLinus Walleij enum uart_pm_state pm_state; 18264047b371SPeter Hurley struct uart_port *uport; 1827ab4382d2SGreg Kroah-Hartman char stat_buf[32]; 1828ab4382d2SGreg Kroah-Hartman unsigned int status; 1829ab4382d2SGreg Kroah-Hartman int mmio; 1830ab4382d2SGreg Kroah-Hartman 18314047b371SPeter Hurley mutex_lock(&port->mutex); 18324047b371SPeter Hurley uport = uart_port_check(state); 1833ab4382d2SGreg Kroah-Hartman if (!uport) 18344047b371SPeter Hurley goto out; 1835ab4382d2SGreg Kroah-Hartman 1836ab4382d2SGreg Kroah-Hartman mmio = uport->iotype >= UPIO_MEM; 1837ab4382d2SGreg Kroah-Hartman seq_printf(m, "%d: uart:%s %s%08llX irq:%d", 1838ab4382d2SGreg Kroah-Hartman uport->line, uart_type(uport), 1839ab4382d2SGreg Kroah-Hartman mmio ? "mmio:0x" : "port:", 1840ab4382d2SGreg Kroah-Hartman mmio ? (unsigned long long)uport->mapbase 1841ab4382d2SGreg Kroah-Hartman : (unsigned long long)uport->iobase, 1842ab4382d2SGreg Kroah-Hartman uport->irq); 1843ab4382d2SGreg Kroah-Hartman 1844ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) { 1845ab4382d2SGreg Kroah-Hartman seq_putc(m, '\n'); 18464047b371SPeter Hurley goto out; 1847ab4382d2SGreg Kroah-Hartman } 1848ab4382d2SGreg Kroah-Hartman 1849ab4382d2SGreg Kroah-Hartman if (capable(CAP_SYS_ADMIN)) { 1850ab4382d2SGreg Kroah-Hartman pm_state = state->pm_state; 18516f538fe3SLinus Walleij if (pm_state != UART_PM_STATE_ON) 18526f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 1853ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1854ab4382d2SGreg Kroah-Hartman status = uport->ops->get_mctrl(uport); 1855ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 18566f538fe3SLinus Walleij if (pm_state != UART_PM_STATE_ON) 1857ab4382d2SGreg Kroah-Hartman uart_change_pm(state, pm_state); 1858ab4382d2SGreg Kroah-Hartman 1859ab4382d2SGreg Kroah-Hartman seq_printf(m, " tx:%d rx:%d", 1860ab4382d2SGreg Kroah-Hartman uport->icount.tx, uport->icount.rx); 1861ab4382d2SGreg Kroah-Hartman if (uport->icount.frame) 1862968af298SPeter Hurley seq_printf(m, " fe:%d", uport->icount.frame); 1863ab4382d2SGreg Kroah-Hartman if (uport->icount.parity) 1864968af298SPeter Hurley seq_printf(m, " pe:%d", uport->icount.parity); 1865ab4382d2SGreg Kroah-Hartman if (uport->icount.brk) 1866968af298SPeter Hurley seq_printf(m, " brk:%d", uport->icount.brk); 1867ab4382d2SGreg Kroah-Hartman if (uport->icount.overrun) 1868968af298SPeter Hurley seq_printf(m, " oe:%d", uport->icount.overrun); 18694f794097SJeremy Kerr if (uport->icount.buf_overrun) 18704f794097SJeremy Kerr seq_printf(m, " bo:%d", uport->icount.buf_overrun); 1871ab4382d2SGreg Kroah-Hartman 1872ab4382d2SGreg Kroah-Hartman #define INFOBIT(bit, str) \ 1873ab4382d2SGreg Kroah-Hartman if (uport->mctrl & (bit)) \ 1874ab4382d2SGreg Kroah-Hartman strncat(stat_buf, (str), sizeof(stat_buf) - \ 1875ab4382d2SGreg Kroah-Hartman strlen(stat_buf) - 2) 1876ab4382d2SGreg Kroah-Hartman #define STATBIT(bit, str) \ 1877ab4382d2SGreg Kroah-Hartman if (status & (bit)) \ 1878ab4382d2SGreg Kroah-Hartman strncat(stat_buf, (str), sizeof(stat_buf) - \ 1879ab4382d2SGreg Kroah-Hartman strlen(stat_buf) - 2) 1880ab4382d2SGreg Kroah-Hartman 1881ab4382d2SGreg Kroah-Hartman stat_buf[0] = '\0'; 1882ab4382d2SGreg Kroah-Hartman stat_buf[1] = '\0'; 1883ab4382d2SGreg Kroah-Hartman INFOBIT(TIOCM_RTS, "|RTS"); 1884ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_CTS, "|CTS"); 1885ab4382d2SGreg Kroah-Hartman INFOBIT(TIOCM_DTR, "|DTR"); 1886ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_DSR, "|DSR"); 1887ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_CAR, "|CD"); 1888ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_RNG, "|RI"); 1889ab4382d2SGreg Kroah-Hartman if (stat_buf[0]) 1890ab4382d2SGreg Kroah-Hartman stat_buf[0] = ' '; 1891ab4382d2SGreg Kroah-Hartman 1892ab4382d2SGreg Kroah-Hartman seq_puts(m, stat_buf); 1893ab4382d2SGreg Kroah-Hartman } 1894ab4382d2SGreg Kroah-Hartman seq_putc(m, '\n'); 1895ab4382d2SGreg Kroah-Hartman #undef STATBIT 1896ab4382d2SGreg Kroah-Hartman #undef INFOBIT 18974047b371SPeter Hurley out: 18984047b371SPeter Hurley mutex_unlock(&port->mutex); 1899ab4382d2SGreg Kroah-Hartman } 1900ab4382d2SGreg Kroah-Hartman 1901ab4382d2SGreg Kroah-Hartman static int uart_proc_show(struct seq_file *m, void *v) 1902ab4382d2SGreg Kroah-Hartman { 1903ab4382d2SGreg Kroah-Hartman struct tty_driver *ttydrv = m->private; 1904ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = ttydrv->driver_state; 1905ab4382d2SGreg Kroah-Hartman int i; 1906ab4382d2SGreg Kroah-Hartman 1907968af298SPeter Hurley seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n", "", "", ""); 1908ab4382d2SGreg Kroah-Hartman for (i = 0; i < drv->nr; i++) 1909ab4382d2SGreg Kroah-Hartman uart_line_info(m, drv, i); 1910ab4382d2SGreg Kroah-Hartman return 0; 1911ab4382d2SGreg Kroah-Hartman } 1912ab4382d2SGreg Kroah-Hartman #endif 1913ab4382d2SGreg Kroah-Hartman 19147a49955aSAndy Shevchenko static inline bool uart_console_enabled(struct uart_port *port) 19157a49955aSAndy Shevchenko { 19167a49955aSAndy Shevchenko return uart_console(port) && (port->cons->flags & CON_ENABLED); 19177a49955aSAndy Shevchenko } 19187a49955aSAndy Shevchenko 1919d2403cadSAndy Shevchenko /* 1920d2403cadSAndy Shevchenko * Ensure that the serial console lock is initialised early. 1921d2403cadSAndy Shevchenko * If this port is a console, then the spinlock is already initialised. 1922d2403cadSAndy Shevchenko */ 1923d2403cadSAndy Shevchenko static inline void uart_port_spin_lock_init(struct uart_port *port) 1924d2403cadSAndy Shevchenko { 1925d2403cadSAndy Shevchenko if (uart_console_enabled(port)) 1926d2403cadSAndy Shevchenko return; 1927d2403cadSAndy Shevchenko 1928d2403cadSAndy Shevchenko spin_lock_init(&port->lock); 1929d2403cadSAndy Shevchenko lockdep_set_class(&port->lock, &port_lock_key); 1930d2403cadSAndy Shevchenko } 1931d2403cadSAndy Shevchenko 1932ab4382d2SGreg Kroah-Hartman #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL) 19331cfe42b7SPeter Hurley /** 1934ab4382d2SGreg Kroah-Hartman * uart_console_write - write a console message to a serial port 1935ab4382d2SGreg Kroah-Hartman * @port: the port to write the message 1936ab4382d2SGreg Kroah-Hartman * @s: array of characters 1937ab4382d2SGreg Kroah-Hartman * @count: number of characters in string to write 193810afbe34SPeter Hurley * @putchar: function to write character to port 1939ab4382d2SGreg Kroah-Hartman */ 1940ab4382d2SGreg Kroah-Hartman void uart_console_write(struct uart_port *port, const char *s, 1941ab4382d2SGreg Kroah-Hartman unsigned int count, 1942ab4382d2SGreg Kroah-Hartman void (*putchar)(struct uart_port *, int)) 1943ab4382d2SGreg Kroah-Hartman { 1944ab4382d2SGreg Kroah-Hartman unsigned int i; 1945ab4382d2SGreg Kroah-Hartman 1946ab4382d2SGreg Kroah-Hartman for (i = 0; i < count; i++, s++) { 1947ab4382d2SGreg Kroah-Hartman if (*s == '\n') 1948ab4382d2SGreg Kroah-Hartman putchar(port, '\r'); 1949ab4382d2SGreg Kroah-Hartman putchar(port, *s); 1950ab4382d2SGreg Kroah-Hartman } 1951ab4382d2SGreg Kroah-Hartman } 1952ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_console_write); 1953ab4382d2SGreg Kroah-Hartman 1954ab4382d2SGreg Kroah-Hartman /* 1955ab4382d2SGreg Kroah-Hartman * Check whether an invalid uart number has been specified, and 1956ab4382d2SGreg Kroah-Hartman * if so, search for the first available port that does have 1957ab4382d2SGreg Kroah-Hartman * console support. 1958ab4382d2SGreg Kroah-Hartman */ 1959ab4382d2SGreg Kroah-Hartman struct uart_port * __init 1960ab4382d2SGreg Kroah-Hartman uart_get_console(struct uart_port *ports, int nr, struct console *co) 1961ab4382d2SGreg Kroah-Hartman { 1962ab4382d2SGreg Kroah-Hartman int idx = co->index; 1963ab4382d2SGreg Kroah-Hartman 1964ab4382d2SGreg Kroah-Hartman if (idx < 0 || idx >= nr || (ports[idx].iobase == 0 && 1965ab4382d2SGreg Kroah-Hartman ports[idx].membase == NULL)) 1966ab4382d2SGreg Kroah-Hartman for (idx = 0; idx < nr; idx++) 1967ab4382d2SGreg Kroah-Hartman if (ports[idx].iobase != 0 || 1968ab4382d2SGreg Kroah-Hartman ports[idx].membase != NULL) 1969ab4382d2SGreg Kroah-Hartman break; 1970ab4382d2SGreg Kroah-Hartman 1971ab4382d2SGreg Kroah-Hartman co->index = idx; 1972ab4382d2SGreg Kroah-Hartman 1973ab4382d2SGreg Kroah-Hartman return ports + idx; 1974ab4382d2SGreg Kroah-Hartman } 1975ab4382d2SGreg Kroah-Hartman 1976ab4382d2SGreg Kroah-Hartman /** 197773abaf87SPeter Hurley * uart_parse_earlycon - Parse earlycon options 197873abaf87SPeter Hurley * @p: ptr to 2nd field (ie., just beyond '<name>,') 197973abaf87SPeter Hurley * @iotype: ptr for decoded iotype (out) 198073abaf87SPeter Hurley * @addr: ptr for decoded mapbase/iobase (out) 198173abaf87SPeter Hurley * @options: ptr for <options> field; NULL if not present (out) 198273abaf87SPeter Hurley * 198373abaf87SPeter Hurley * Decodes earlycon kernel command line parameters of the form 1984bd94c407SMasahiro Yamada * earlycon=<name>,io|mmio|mmio16|mmio32|mmio32be|mmio32native,<addr>,<options> 1985bd94c407SMasahiro Yamada * console=<name>,io|mmio|mmio16|mmio32|mmio32be|mmio32native,<addr>,<options> 198673abaf87SPeter Hurley * 198773abaf87SPeter Hurley * The optional form 1988ff30283aSRandy Dunlap * 198973abaf87SPeter Hurley * earlycon=<name>,0x<addr>,<options> 199073abaf87SPeter Hurley * console=<name>,0x<addr>,<options> 1991ff30283aSRandy Dunlap * 199273abaf87SPeter Hurley * is also accepted; the returned @iotype will be UPIO_MEM. 199373abaf87SPeter Hurley * 19948b2303deSAlexander Sverdlin * Returns 0 on success or -EINVAL on failure 199573abaf87SPeter Hurley */ 199646e36683SAlexander Sverdlin int uart_parse_earlycon(char *p, unsigned char *iotype, resource_size_t *addr, 199773abaf87SPeter Hurley char **options) 199873abaf87SPeter Hurley { 199973abaf87SPeter Hurley if (strncmp(p, "mmio,", 5) == 0) { 200073abaf87SPeter Hurley *iotype = UPIO_MEM; 200173abaf87SPeter Hurley p += 5; 2002bd94c407SMasahiro Yamada } else if (strncmp(p, "mmio16,", 7) == 0) { 2003bd94c407SMasahiro Yamada *iotype = UPIO_MEM16; 2004bd94c407SMasahiro Yamada p += 7; 200573abaf87SPeter Hurley } else if (strncmp(p, "mmio32,", 7) == 0) { 200673abaf87SPeter Hurley *iotype = UPIO_MEM32; 200773abaf87SPeter Hurley p += 7; 20086e63be3fSNoam Camus } else if (strncmp(p, "mmio32be,", 9) == 0) { 20096e63be3fSNoam Camus *iotype = UPIO_MEM32BE; 20106e63be3fSNoam Camus p += 9; 2011d215d809SMax Filippov } else if (strncmp(p, "mmio32native,", 13) == 0) { 2012d215d809SMax Filippov *iotype = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) ? 2013d215d809SMax Filippov UPIO_MEM32BE : UPIO_MEM32; 2014d215d809SMax Filippov p += 13; 201573abaf87SPeter Hurley } else if (strncmp(p, "io,", 3) == 0) { 201673abaf87SPeter Hurley *iotype = UPIO_PORT; 201773abaf87SPeter Hurley p += 3; 201873abaf87SPeter Hurley } else if (strncmp(p, "0x", 2) == 0) { 201973abaf87SPeter Hurley *iotype = UPIO_MEM; 202073abaf87SPeter Hurley } else { 202173abaf87SPeter Hurley return -EINVAL; 202273abaf87SPeter Hurley } 202373abaf87SPeter Hurley 20248b2303deSAlexander Sverdlin /* 20258b2303deSAlexander Sverdlin * Before you replace it with kstrtoull(), think about options separator 20268b2303deSAlexander Sverdlin * (',') it will not tolerate 20278b2303deSAlexander Sverdlin */ 20288b2303deSAlexander Sverdlin *addr = simple_strtoull(p, NULL, 0); 202973abaf87SPeter Hurley p = strchr(p, ','); 203073abaf87SPeter Hurley if (p) 203173abaf87SPeter Hurley p++; 203273abaf87SPeter Hurley 203373abaf87SPeter Hurley *options = p; 203473abaf87SPeter Hurley return 0; 203573abaf87SPeter Hurley } 203673abaf87SPeter Hurley EXPORT_SYMBOL_GPL(uart_parse_earlycon); 203773abaf87SPeter Hurley 203873abaf87SPeter Hurley /** 203902088ca6SGeert Uytterhoeven * uart_parse_options - Parse serial port baud/parity/bits/flow control. 2040ab4382d2SGreg Kroah-Hartman * @options: pointer to option string 2041ab4382d2SGreg Kroah-Hartman * @baud: pointer to an 'int' variable for the baud rate. 2042ab4382d2SGreg Kroah-Hartman * @parity: pointer to an 'int' variable for the parity. 2043ab4382d2SGreg Kroah-Hartman * @bits: pointer to an 'int' variable for the number of data bits. 2044ab4382d2SGreg Kroah-Hartman * @flow: pointer to an 'int' variable for the flow control character. 2045ab4382d2SGreg Kroah-Hartman * 2046ab4382d2SGreg Kroah-Hartman * uart_parse_options decodes a string containing the serial console 2047ab4382d2SGreg Kroah-Hartman * options. The format of the string is <baud><parity><bits><flow>, 2048ab4382d2SGreg Kroah-Hartman * eg: 115200n8r 2049ab4382d2SGreg Kroah-Hartman */ 2050ab4382d2SGreg Kroah-Hartman void 20510f646b63SPaul Cercueil uart_parse_options(const char *options, int *baud, int *parity, 20520f646b63SPaul Cercueil int *bits, int *flow) 2053ab4382d2SGreg Kroah-Hartman { 20540f646b63SPaul Cercueil const char *s = options; 2055ab4382d2SGreg Kroah-Hartman 2056ab4382d2SGreg Kroah-Hartman *baud = simple_strtoul(s, NULL, 10); 2057ab4382d2SGreg Kroah-Hartman while (*s >= '0' && *s <= '9') 2058ab4382d2SGreg Kroah-Hartman s++; 2059ab4382d2SGreg Kroah-Hartman if (*s) 2060ab4382d2SGreg Kroah-Hartman *parity = *s++; 2061ab4382d2SGreg Kroah-Hartman if (*s) 2062ab4382d2SGreg Kroah-Hartman *bits = *s++ - '0'; 2063ab4382d2SGreg Kroah-Hartman if (*s) 2064ab4382d2SGreg Kroah-Hartman *flow = *s; 2065ab4382d2SGreg Kroah-Hartman } 2066ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_parse_options); 2067ab4382d2SGreg Kroah-Hartman 2068ab4382d2SGreg Kroah-Hartman /** 2069ab4382d2SGreg Kroah-Hartman * uart_set_options - setup the serial console parameters 2070ab4382d2SGreg Kroah-Hartman * @port: pointer to the serial ports uart_port structure 2071ab4382d2SGreg Kroah-Hartman * @co: console pointer 2072ab4382d2SGreg Kroah-Hartman * @baud: baud rate 2073ab4382d2SGreg Kroah-Hartman * @parity: parity character - 'n' (none), 'o' (odd), 'e' (even) 2074ab4382d2SGreg Kroah-Hartman * @bits: number of data bits 2075ab4382d2SGreg Kroah-Hartman * @flow: flow control character - 'r' (rts) 2076ab4382d2SGreg Kroah-Hartman */ 2077ab4382d2SGreg Kroah-Hartman int 2078ab4382d2SGreg Kroah-Hartman uart_set_options(struct uart_port *port, struct console *co, 2079ab4382d2SGreg Kroah-Hartman int baud, int parity, int bits, int flow) 2080ab4382d2SGreg Kroah-Hartman { 2081ab4382d2SGreg Kroah-Hartman struct ktermios termios; 2082ab4382d2SGreg Kroah-Hartman static struct ktermios dummy; 2083ab4382d2SGreg Kroah-Hartman 2084d2403cadSAndy Shevchenko uart_port_spin_lock_init(port); 2085ab4382d2SGreg Kroah-Hartman 2086ab4382d2SGreg Kroah-Hartman memset(&termios, 0, sizeof(struct ktermios)); 2087ab4382d2SGreg Kroah-Hartman 2088ba47f97aSJeffy Chen termios.c_cflag |= CREAD | HUPCL | CLOCAL; 2089ba47f97aSJeffy Chen tty_termios_encode_baud_rate(&termios, baud, baud); 2090ab4382d2SGreg Kroah-Hartman 2091ab4382d2SGreg Kroah-Hartman if (bits == 7) 2092ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CS7; 2093ab4382d2SGreg Kroah-Hartman else 2094ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CS8; 2095ab4382d2SGreg Kroah-Hartman 2096ab4382d2SGreg Kroah-Hartman switch (parity) { 2097ab4382d2SGreg Kroah-Hartman case 'o': case 'O': 2098ab4382d2SGreg Kroah-Hartman termios.c_cflag |= PARODD; 2099ab4382d2SGreg Kroah-Hartman /*fall through*/ 2100ab4382d2SGreg Kroah-Hartman case 'e': case 'E': 2101ab4382d2SGreg Kroah-Hartman termios.c_cflag |= PARENB; 2102ab4382d2SGreg Kroah-Hartman break; 2103ab4382d2SGreg Kroah-Hartman } 2104ab4382d2SGreg Kroah-Hartman 2105ab4382d2SGreg Kroah-Hartman if (flow == 'r') 2106ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CRTSCTS; 2107ab4382d2SGreg Kroah-Hartman 2108ab4382d2SGreg Kroah-Hartman /* 2109ab4382d2SGreg Kroah-Hartman * some uarts on other side don't support no flow control. 2110ab4382d2SGreg Kroah-Hartman * So we set * DTR in host uart to make them happy 2111ab4382d2SGreg Kroah-Hartman */ 2112ab4382d2SGreg Kroah-Hartman port->mctrl |= TIOCM_DTR; 2113ab4382d2SGreg Kroah-Hartman 2114ab4382d2SGreg Kroah-Hartman port->ops->set_termios(port, &termios, &dummy); 2115ab4382d2SGreg Kroah-Hartman /* 2116ab4382d2SGreg Kroah-Hartman * Allow the setting of the UART parameters with a NULL console 2117ab4382d2SGreg Kroah-Hartman * too: 2118ab4382d2SGreg Kroah-Hartman */ 2119ab4382d2SGreg Kroah-Hartman if (co) 2120ab4382d2SGreg Kroah-Hartman co->cflag = termios.c_cflag; 2121ab4382d2SGreg Kroah-Hartman 2122ab4382d2SGreg Kroah-Hartman return 0; 2123ab4382d2SGreg Kroah-Hartman } 2124ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_set_options); 2125ab4382d2SGreg Kroah-Hartman #endif /* CONFIG_SERIAL_CORE_CONSOLE */ 2126ab4382d2SGreg Kroah-Hartman 2127cf75525fSJiri Slaby /** 2128cf75525fSJiri Slaby * uart_change_pm - set power state of the port 2129cf75525fSJiri Slaby * 2130cf75525fSJiri Slaby * @state: port descriptor 2131cf75525fSJiri Slaby * @pm_state: new state 2132cf75525fSJiri Slaby * 2133cf75525fSJiri Slaby * Locking: port->mutex has to be held 2134cf75525fSJiri Slaby */ 21356f538fe3SLinus Walleij static void uart_change_pm(struct uart_state *state, 21366f538fe3SLinus Walleij enum uart_pm_state pm_state) 2137ab4382d2SGreg Kroah-Hartman { 21384047b371SPeter Hurley struct uart_port *port = uart_port_check(state); 2139ab4382d2SGreg Kroah-Hartman 2140ab4382d2SGreg Kroah-Hartman if (state->pm_state != pm_state) { 21414047b371SPeter Hurley if (port && port->ops->pm) 2142ab4382d2SGreg Kroah-Hartman port->ops->pm(port, pm_state, state->pm_state); 2143ab4382d2SGreg Kroah-Hartman state->pm_state = pm_state; 2144ab4382d2SGreg Kroah-Hartman } 2145ab4382d2SGreg Kroah-Hartman } 2146ab4382d2SGreg Kroah-Hartman 2147ab4382d2SGreg Kroah-Hartman struct uart_match { 2148ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2149ab4382d2SGreg Kroah-Hartman struct uart_driver *driver; 2150ab4382d2SGreg Kroah-Hartman }; 2151ab4382d2SGreg Kroah-Hartman 2152ab4382d2SGreg Kroah-Hartman static int serial_match_port(struct device *dev, void *data) 2153ab4382d2SGreg Kroah-Hartman { 2154ab4382d2SGreg Kroah-Hartman struct uart_match *match = data; 2155ab4382d2SGreg Kroah-Hartman struct tty_driver *tty_drv = match->driver->tty_driver; 2156ab4382d2SGreg Kroah-Hartman dev_t devt = MKDEV(tty_drv->major, tty_drv->minor_start) + 2157ab4382d2SGreg Kroah-Hartman match->port->line; 2158ab4382d2SGreg Kroah-Hartman 2159ab4382d2SGreg Kroah-Hartman return dev->devt == devt; /* Actually, only one tty per port */ 2160ab4382d2SGreg Kroah-Hartman } 2161ab4382d2SGreg Kroah-Hartman 2162ab4382d2SGreg Kroah-Hartman int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport) 2163ab4382d2SGreg Kroah-Hartman { 2164ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 2165ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2166ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 2167ab4382d2SGreg Kroah-Hartman struct uart_match match = {uport, drv}; 2168ab4382d2SGreg Kroah-Hartman 2169ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2170ab4382d2SGreg Kroah-Hartman 2171ab4382d2SGreg Kroah-Hartman tty_dev = device_find_child(uport->dev, &match, serial_match_port); 217288e2582eSLucas Stach if (tty_dev && device_may_wakeup(tty_dev)) { 2173aef3ad10SAndy Shevchenko enable_irq_wake(uport->irq); 2174ab4382d2SGreg Kroah-Hartman put_device(tty_dev); 2175ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2176ab4382d2SGreg Kroah-Hartman return 0; 2177ab4382d2SGreg Kroah-Hartman } 21785a65dcc0SFederico Vaga put_device(tty_dev); 21795a65dcc0SFederico Vaga 2180b164c972SPeter Hurley /* Nothing to do if the console is not suspending */ 2181b164c972SPeter Hurley if (!console_suspend_enabled && uart_console(uport)) 2182b164c972SPeter Hurley goto unlock; 2183b164c972SPeter Hurley 2184ab4382d2SGreg Kroah-Hartman uport->suspended = 1; 2185ab4382d2SGreg Kroah-Hartman 2186d41861caSPeter Hurley if (tty_port_initialized(port)) { 2187ab4382d2SGreg Kroah-Hartman const struct uart_ops *ops = uport->ops; 2188ab4382d2SGreg Kroah-Hartman int tries; 2189ab4382d2SGreg Kroah-Hartman 219080f02d54SPeter Hurley tty_port_set_suspended(port, 1); 2191d41861caSPeter Hurley tty_port_set_initialized(port, 0); 2192ab4382d2SGreg Kroah-Hartman 2193ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 2194ab4382d2SGreg Kroah-Hartman ops->stop_tx(uport); 2195ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, 0); 2196ab4382d2SGreg Kroah-Hartman ops->stop_rx(uport); 2197ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2198ab4382d2SGreg Kroah-Hartman 2199ab4382d2SGreg Kroah-Hartman /* 2200ab4382d2SGreg Kroah-Hartman * Wait for the transmitter to empty. 2201ab4382d2SGreg Kroah-Hartman */ 2202ab4382d2SGreg Kroah-Hartman for (tries = 3; !ops->tx_empty(uport) && tries; tries--) 2203ab4382d2SGreg Kroah-Hartman msleep(10); 2204ab4382d2SGreg Kroah-Hartman if (!tries) 2205cade3580SAndy Shevchenko dev_err(uport->dev, "%s: Unable to drain transmitter\n", 2206cade3580SAndy Shevchenko uport->name); 2207ab4382d2SGreg Kroah-Hartman 2208ab4382d2SGreg Kroah-Hartman ops->shutdown(uport); 2209ab4382d2SGreg Kroah-Hartman } 2210ab4382d2SGreg Kroah-Hartman 2211ab4382d2SGreg Kroah-Hartman /* 2212ab4382d2SGreg Kroah-Hartman * Disable the console device before suspending. 2213ab4382d2SGreg Kroah-Hartman */ 2214b164c972SPeter Hurley if (uart_console(uport)) 2215ab4382d2SGreg Kroah-Hartman console_stop(uport->cons); 2216ab4382d2SGreg Kroah-Hartman 22176f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_OFF); 2218b164c972SPeter Hurley unlock: 2219ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2220ab4382d2SGreg Kroah-Hartman 2221ab4382d2SGreg Kroah-Hartman return 0; 2222ab4382d2SGreg Kroah-Hartman } 2223ab4382d2SGreg Kroah-Hartman 2224ab4382d2SGreg Kroah-Hartman int uart_resume_port(struct uart_driver *drv, struct uart_port *uport) 2225ab4382d2SGreg Kroah-Hartman { 2226ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 2227ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2228ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 2229ab4382d2SGreg Kroah-Hartman struct uart_match match = {uport, drv}; 2230ab4382d2SGreg Kroah-Hartman struct ktermios termios; 2231ab4382d2SGreg Kroah-Hartman 2232ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2233ab4382d2SGreg Kroah-Hartman 2234ab4382d2SGreg Kroah-Hartman tty_dev = device_find_child(uport->dev, &match, serial_match_port); 2235ab4382d2SGreg Kroah-Hartman if (!uport->suspended && device_may_wakeup(tty_dev)) { 2236aef3ad10SAndy Shevchenko if (irqd_is_wakeup_set(irq_get_irq_data((uport->irq)))) 2237ab4382d2SGreg Kroah-Hartman disable_irq_wake(uport->irq); 22385a65dcc0SFederico Vaga put_device(tty_dev); 2239ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2240ab4382d2SGreg Kroah-Hartman return 0; 2241ab4382d2SGreg Kroah-Hartman } 22425a65dcc0SFederico Vaga put_device(tty_dev); 2243ab4382d2SGreg Kroah-Hartman uport->suspended = 0; 2244ab4382d2SGreg Kroah-Hartman 2245ab4382d2SGreg Kroah-Hartman /* 2246ab4382d2SGreg Kroah-Hartman * Re-enable the console device after suspending. 2247ab4382d2SGreg Kroah-Hartman */ 22485933a161SYin Kangkai if (uart_console(uport)) { 2249ab4382d2SGreg Kroah-Hartman /* 2250ab4382d2SGreg Kroah-Hartman * First try to use the console cflag setting. 2251ab4382d2SGreg Kroah-Hartman */ 2252ab4382d2SGreg Kroah-Hartman memset(&termios, 0, sizeof(struct ktermios)); 2253ab4382d2SGreg Kroah-Hartman termios.c_cflag = uport->cons->cflag; 2254ab4382d2SGreg Kroah-Hartman 2255ab4382d2SGreg Kroah-Hartman /* 2256ab4382d2SGreg Kroah-Hartman * If that's unset, use the tty termios setting. 2257ab4382d2SGreg Kroah-Hartman */ 2258adc8d746SAlan Cox if (port->tty && termios.c_cflag == 0) 2259adc8d746SAlan Cox termios = port->tty->termios; 2260ab4382d2SGreg Kroah-Hartman 226194abc56fSNing Jiang if (console_suspend_enabled) 22626f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2263ab4382d2SGreg Kroah-Hartman uport->ops->set_termios(uport, &termios, NULL); 22645933a161SYin Kangkai if (console_suspend_enabled) 2265ab4382d2SGreg Kroah-Hartman console_start(uport->cons); 2266ab4382d2SGreg Kroah-Hartman } 2267ab4382d2SGreg Kroah-Hartman 226880f02d54SPeter Hurley if (tty_port_suspended(port)) { 2269ab4382d2SGreg Kroah-Hartman const struct uart_ops *ops = uport->ops; 2270ab4382d2SGreg Kroah-Hartman int ret; 2271ab4382d2SGreg Kroah-Hartman 22726f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2273ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 2274ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, 0); 2275ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2276ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) { 2277ab4382d2SGreg Kroah-Hartman /* Protected by port mutex for now */ 2278ab4382d2SGreg Kroah-Hartman struct tty_struct *tty = port->tty; 2279ab4382d2SGreg Kroah-Hartman ret = ops->startup(uport); 2280ab4382d2SGreg Kroah-Hartman if (ret == 0) { 2281ab4382d2SGreg Kroah-Hartman if (tty) 2282ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 2283ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 2284ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, uport->mctrl); 2285ab4382d2SGreg Kroah-Hartman ops->start_tx(uport); 2286ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2287d41861caSPeter Hurley tty_port_set_initialized(port, 1); 2288ab4382d2SGreg Kroah-Hartman } else { 2289ab4382d2SGreg Kroah-Hartman /* 2290ab4382d2SGreg Kroah-Hartman * Failed to resume - maybe hardware went away? 2291ab4382d2SGreg Kroah-Hartman * Clear the "initialized" flag so we won't try 2292ab4382d2SGreg Kroah-Hartman * to call the low level drivers shutdown method. 2293ab4382d2SGreg Kroah-Hartman */ 2294ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 2295ab4382d2SGreg Kroah-Hartman } 2296ab4382d2SGreg Kroah-Hartman } 2297ab4382d2SGreg Kroah-Hartman 229880f02d54SPeter Hurley tty_port_set_suspended(port, 0); 2299ab4382d2SGreg Kroah-Hartman } 2300ab4382d2SGreg Kroah-Hartman 2301ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2302ab4382d2SGreg Kroah-Hartman 2303ab4382d2SGreg Kroah-Hartman return 0; 2304ab4382d2SGreg Kroah-Hartman } 2305ab4382d2SGreg Kroah-Hartman 2306ab4382d2SGreg Kroah-Hartman static inline void 2307ab4382d2SGreg Kroah-Hartman uart_report_port(struct uart_driver *drv, struct uart_port *port) 2308ab4382d2SGreg Kroah-Hartman { 2309ab4382d2SGreg Kroah-Hartman char address[64]; 2310ab4382d2SGreg Kroah-Hartman 2311ab4382d2SGreg Kroah-Hartman switch (port->iotype) { 2312ab4382d2SGreg Kroah-Hartman case UPIO_PORT: 2313ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), "I/O 0x%lx", port->iobase); 2314ab4382d2SGreg Kroah-Hartman break; 2315ab4382d2SGreg Kroah-Hartman case UPIO_HUB6: 2316ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), 2317ab4382d2SGreg Kroah-Hartman "I/O 0x%lx offset 0x%x", port->iobase, port->hub6); 2318ab4382d2SGreg Kroah-Hartman break; 2319ab4382d2SGreg Kroah-Hartman case UPIO_MEM: 2320bd94c407SMasahiro Yamada case UPIO_MEM16: 2321ab4382d2SGreg Kroah-Hartman case UPIO_MEM32: 23223ffb1a81SKevin Cernekee case UPIO_MEM32BE: 2323ab4382d2SGreg Kroah-Hartman case UPIO_AU: 2324ab4382d2SGreg Kroah-Hartman case UPIO_TSI: 2325ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), 2326ab4382d2SGreg Kroah-Hartman "MMIO 0x%llx", (unsigned long long)port->mapbase); 2327ab4382d2SGreg Kroah-Hartman break; 2328ab4382d2SGreg Kroah-Hartman default: 2329ab4382d2SGreg Kroah-Hartman strlcpy(address, "*unknown*", sizeof(address)); 2330ab4382d2SGreg Kroah-Hartman break; 2331ab4382d2SGreg Kroah-Hartman } 2332ab4382d2SGreg Kroah-Hartman 2333cade3580SAndy Shevchenko pr_info("%s%s%s at %s (irq = %d, base_baud = %d) is a %s\n", 233468ed7e1cSJames Bottomley port->dev ? dev_name(port->dev) : "", 233568ed7e1cSJames Bottomley port->dev ? ": " : "", 2336cade3580SAndy Shevchenko port->name, 23377d12b976SKees Cook address, port->irq, port->uartclk / 16, uart_type(port)); 2338ab4382d2SGreg Kroah-Hartman } 2339ab4382d2SGreg Kroah-Hartman 2340ab4382d2SGreg Kroah-Hartman static void 2341ab4382d2SGreg Kroah-Hartman uart_configure_port(struct uart_driver *drv, struct uart_state *state, 2342ab4382d2SGreg Kroah-Hartman struct uart_port *port) 2343ab4382d2SGreg Kroah-Hartman { 2344ab4382d2SGreg Kroah-Hartman unsigned int flags; 2345ab4382d2SGreg Kroah-Hartman 2346ab4382d2SGreg Kroah-Hartman /* 2347ab4382d2SGreg Kroah-Hartman * If there isn't a port here, don't do anything further. 2348ab4382d2SGreg Kroah-Hartman */ 2349ab4382d2SGreg Kroah-Hartman if (!port->iobase && !port->mapbase && !port->membase) 2350ab4382d2SGreg Kroah-Hartman return; 2351ab4382d2SGreg Kroah-Hartman 2352ab4382d2SGreg Kroah-Hartman /* 2353ab4382d2SGreg Kroah-Hartman * Now do the auto configuration stuff. Note that config_port 2354ab4382d2SGreg Kroah-Hartman * is expected to claim the resources and map the port for us. 2355ab4382d2SGreg Kroah-Hartman */ 2356ab4382d2SGreg Kroah-Hartman flags = 0; 2357ab4382d2SGreg Kroah-Hartman if (port->flags & UPF_AUTO_IRQ) 2358ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_IRQ; 2359ab4382d2SGreg Kroah-Hartman if (port->flags & UPF_BOOT_AUTOCONF) { 2360ab4382d2SGreg Kroah-Hartman if (!(port->flags & UPF_FIXED_TYPE)) { 2361ab4382d2SGreg Kroah-Hartman port->type = PORT_UNKNOWN; 2362ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_TYPE; 2363ab4382d2SGreg Kroah-Hartman } 2364ab4382d2SGreg Kroah-Hartman port->ops->config_port(port, flags); 2365ab4382d2SGreg Kroah-Hartman } 2366ab4382d2SGreg Kroah-Hartman 2367ab4382d2SGreg Kroah-Hartman if (port->type != PORT_UNKNOWN) { 2368ab4382d2SGreg Kroah-Hartman unsigned long flags; 2369ab4382d2SGreg Kroah-Hartman 2370ab4382d2SGreg Kroah-Hartman uart_report_port(drv, port); 2371ab4382d2SGreg Kroah-Hartman 2372ab4382d2SGreg Kroah-Hartman /* Power up port for set_mctrl() */ 23736f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2374ab4382d2SGreg Kroah-Hartman 2375ab4382d2SGreg Kroah-Hartman /* 2376ab4382d2SGreg Kroah-Hartman * Ensure that the modem control lines are de-activated. 2377ab4382d2SGreg Kroah-Hartman * keep the DTR setting that is set in uart_set_options() 2378ab4382d2SGreg Kroah-Hartman * We probably don't need a spinlock around this, but 2379ab4382d2SGreg Kroah-Hartman */ 2380ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 2381ab4382d2SGreg Kroah-Hartman port->ops->set_mctrl(port, port->mctrl & TIOCM_DTR); 2382ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 2383ab4382d2SGreg Kroah-Hartman 2384ab4382d2SGreg Kroah-Hartman /* 2385ab4382d2SGreg Kroah-Hartman * If this driver supports console, and it hasn't been 2386ab4382d2SGreg Kroah-Hartman * successfully registered yet, try to re-register it. 2387ab4382d2SGreg Kroah-Hartman * It may be that the port was not available. 2388ab4382d2SGreg Kroah-Hartman */ 2389ab4382d2SGreg Kroah-Hartman if (port->cons && !(port->cons->flags & CON_ENABLED)) 2390ab4382d2SGreg Kroah-Hartman register_console(port->cons); 2391ab4382d2SGreg Kroah-Hartman 2392ab4382d2SGreg Kroah-Hartman /* 2393ab4382d2SGreg Kroah-Hartman * Power down all ports by default, except the 2394ab4382d2SGreg Kroah-Hartman * console if we have one. 2395ab4382d2SGreg Kroah-Hartman */ 2396ab4382d2SGreg Kroah-Hartman if (!uart_console(port)) 23976f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_OFF); 2398ab4382d2SGreg Kroah-Hartman } 2399ab4382d2SGreg Kroah-Hartman } 2400ab4382d2SGreg Kroah-Hartman 2401ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 2402ab4382d2SGreg Kroah-Hartman 2403ab4382d2SGreg Kroah-Hartman static int uart_poll_init(struct tty_driver *driver, int line, char *options) 2404ab4382d2SGreg Kroah-Hartman { 2405ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2406ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 240749c02304SPeter Hurley struct tty_port *tport; 2408ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2409ab4382d2SGreg Kroah-Hartman int baud = 9600; 2410ab4382d2SGreg Kroah-Hartman int bits = 8; 2411ab4382d2SGreg Kroah-Hartman int parity = 'n'; 2412ab4382d2SGreg Kroah-Hartman int flow = 'n'; 241349c02304SPeter Hurley int ret = 0; 2414ab4382d2SGreg Kroah-Hartman 241549c02304SPeter Hurley tport = &state->port; 241649c02304SPeter Hurley mutex_lock(&tport->mutex); 241749c02304SPeter Hurley 24184047b371SPeter Hurley port = uart_port_check(state); 24194047b371SPeter Hurley if (!port || !(port->ops->poll_get_char && port->ops->poll_put_char)) { 242049c02304SPeter Hurley ret = -1; 242149c02304SPeter Hurley goto out; 242249c02304SPeter Hurley } 2423ab4382d2SGreg Kroah-Hartman 2424c7f3e708SAnton Vorontsov if (port->ops->poll_init) { 2425c7f3e708SAnton Vorontsov /* 2426d41861caSPeter Hurley * We don't set initialized as we only initialized the hw, 2427d41861caSPeter Hurley * e.g. state->xmit is still uninitialized. 2428c7f3e708SAnton Vorontsov */ 2429d41861caSPeter Hurley if (!tty_port_initialized(tport)) 2430c7f3e708SAnton Vorontsov ret = port->ops->poll_init(port); 2431c7f3e708SAnton Vorontsov } 2432c7f3e708SAnton Vorontsov 243349c02304SPeter Hurley if (!ret && options) { 2434ab4382d2SGreg Kroah-Hartman uart_parse_options(options, &baud, &parity, &bits, &flow); 243549c02304SPeter Hurley ret = uart_set_options(port, NULL, baud, parity, bits, flow); 2436ab4382d2SGreg Kroah-Hartman } 243749c02304SPeter Hurley out: 243849c02304SPeter Hurley mutex_unlock(&tport->mutex); 243949c02304SPeter Hurley return ret; 2440ab4382d2SGreg Kroah-Hartman } 2441ab4382d2SGreg Kroah-Hartman 2442ab4382d2SGreg Kroah-Hartman static int uart_poll_get_char(struct tty_driver *driver, int line) 2443ab4382d2SGreg Kroah-Hartman { 2444ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2445ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2446ab4382d2SGreg Kroah-Hartman struct uart_port *port; 24479ed19428SPeter Hurley int ret = -1; 2448ab4382d2SGreg Kroah-Hartman 24499ed19428SPeter Hurley port = uart_port_ref(state); 2450ef510beaSAndy Shevchenko if (port) { 24519ed19428SPeter Hurley ret = port->ops->poll_get_char(port); 24529ed19428SPeter Hurley uart_port_deref(port); 24539ed19428SPeter Hurley } 245422077b09SJiri Slaby 24559ed19428SPeter Hurley return ret; 2456ab4382d2SGreg Kroah-Hartman } 2457ab4382d2SGreg Kroah-Hartman 2458ab4382d2SGreg Kroah-Hartman static void uart_poll_put_char(struct tty_driver *driver, int line, char ch) 2459ab4382d2SGreg Kroah-Hartman { 2460ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2461ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2462ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2463ab4382d2SGreg Kroah-Hartman 24649ed19428SPeter Hurley port = uart_port_ref(state); 24659ed19428SPeter Hurley if (!port) 24669ed19428SPeter Hurley return; 2467c7d44a02SDoug Anderson 2468c7d44a02SDoug Anderson if (ch == '\n') 2469c7d44a02SDoug Anderson port->ops->poll_put_char(port, '\r'); 2470ab4382d2SGreg Kroah-Hartman port->ops->poll_put_char(port, ch); 24719ed19428SPeter Hurley uart_port_deref(port); 2472ab4382d2SGreg Kroah-Hartman } 2473ab4382d2SGreg Kroah-Hartman #endif 2474ab4382d2SGreg Kroah-Hartman 2475ab4382d2SGreg Kroah-Hartman static const struct tty_operations uart_ops = { 24764cdd17baSJiri Slaby .install = uart_install, 2477ab4382d2SGreg Kroah-Hartman .open = uart_open, 2478ab4382d2SGreg Kroah-Hartman .close = uart_close, 2479ab4382d2SGreg Kroah-Hartman .write = uart_write, 2480ab4382d2SGreg Kroah-Hartman .put_char = uart_put_char, 2481ab4382d2SGreg Kroah-Hartman .flush_chars = uart_flush_chars, 2482ab4382d2SGreg Kroah-Hartman .write_room = uart_write_room, 2483ab4382d2SGreg Kroah-Hartman .chars_in_buffer= uart_chars_in_buffer, 2484ab4382d2SGreg Kroah-Hartman .flush_buffer = uart_flush_buffer, 2485ab4382d2SGreg Kroah-Hartman .ioctl = uart_ioctl, 2486ab4382d2SGreg Kroah-Hartman .throttle = uart_throttle, 2487ab4382d2SGreg Kroah-Hartman .unthrottle = uart_unthrottle, 2488ab4382d2SGreg Kroah-Hartman .send_xchar = uart_send_xchar, 2489ab4382d2SGreg Kroah-Hartman .set_termios = uart_set_termios, 2490ab4382d2SGreg Kroah-Hartman .set_ldisc = uart_set_ldisc, 2491ab4382d2SGreg Kroah-Hartman .stop = uart_stop, 2492ab4382d2SGreg Kroah-Hartman .start = uart_start, 2493ab4382d2SGreg Kroah-Hartman .hangup = uart_hangup, 2494ab4382d2SGreg Kroah-Hartman .break_ctl = uart_break_ctl, 2495ab4382d2SGreg Kroah-Hartman .wait_until_sent= uart_wait_until_sent, 2496ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_PROC_FS 24978a8dcabfSChristoph Hellwig .proc_show = uart_proc_show, 2498ab4382d2SGreg Kroah-Hartman #endif 2499ab4382d2SGreg Kroah-Hartman .tiocmget = uart_tiocmget, 2500ab4382d2SGreg Kroah-Hartman .tiocmset = uart_tiocmset, 25015099d234SAl Viro .set_serial = uart_set_info_user, 25025099d234SAl Viro .get_serial = uart_get_info_user, 2503ab4382d2SGreg Kroah-Hartman .get_icount = uart_get_icount, 2504ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 2505ab4382d2SGreg Kroah-Hartman .poll_init = uart_poll_init, 2506ab4382d2SGreg Kroah-Hartman .poll_get_char = uart_poll_get_char, 2507ab4382d2SGreg Kroah-Hartman .poll_put_char = uart_poll_put_char, 2508ab4382d2SGreg Kroah-Hartman #endif 2509ab4382d2SGreg Kroah-Hartman }; 2510ab4382d2SGreg Kroah-Hartman 2511ab4382d2SGreg Kroah-Hartman static const struct tty_port_operations uart_port_ops = { 2512ab4382d2SGreg Kroah-Hartman .carrier_raised = uart_carrier_raised, 2513ab4382d2SGreg Kroah-Hartman .dtr_rts = uart_dtr_rts, 2514b3b57646SRob Herring .activate = uart_port_activate, 2515761ed4a9SRob Herring .shutdown = uart_tty_port_shutdown, 2516ab4382d2SGreg Kroah-Hartman }; 2517ab4382d2SGreg Kroah-Hartman 2518ab4382d2SGreg Kroah-Hartman /** 2519ab4382d2SGreg Kroah-Hartman * uart_register_driver - register a driver with the uart core layer 2520ab4382d2SGreg Kroah-Hartman * @drv: low level driver structure 2521ab4382d2SGreg Kroah-Hartman * 2522ab4382d2SGreg Kroah-Hartman * Register a uart driver with the core driver. We in turn register 2523ab4382d2SGreg Kroah-Hartman * with the tty layer, and initialise the core driver per-port state. 2524ab4382d2SGreg Kroah-Hartman * 2525ab4382d2SGreg Kroah-Hartman * We have a proc file in /proc/tty/driver which is named after the 2526ab4382d2SGreg Kroah-Hartman * normal driver. 2527ab4382d2SGreg Kroah-Hartman * 2528ab4382d2SGreg Kroah-Hartman * drv->port should be NULL, and the per-port structures should be 2529ab4382d2SGreg Kroah-Hartman * registered using uart_add_one_port after this call has succeeded. 2530ab4382d2SGreg Kroah-Hartman */ 2531ab4382d2SGreg Kroah-Hartman int uart_register_driver(struct uart_driver *drv) 2532ab4382d2SGreg Kroah-Hartman { 2533ab4382d2SGreg Kroah-Hartman struct tty_driver *normal; 2534050dfc09SSergey Organov int i, retval = -ENOMEM; 2535ab4382d2SGreg Kroah-Hartman 2536ab4382d2SGreg Kroah-Hartman BUG_ON(drv->state); 2537ab4382d2SGreg Kroah-Hartman 2538ab4382d2SGreg Kroah-Hartman /* 2539ab4382d2SGreg Kroah-Hartman * Maybe we should be using a slab cache for this, especially if 2540ab4382d2SGreg Kroah-Hartman * we have a large number of ports to handle. 2541ab4382d2SGreg Kroah-Hartman */ 25426396bb22SKees Cook drv->state = kcalloc(drv->nr, sizeof(struct uart_state), GFP_KERNEL); 2543ab4382d2SGreg Kroah-Hartman if (!drv->state) 2544ab4382d2SGreg Kroah-Hartman goto out; 2545ab4382d2SGreg Kroah-Hartman 2546ab4382d2SGreg Kroah-Hartman normal = alloc_tty_driver(drv->nr); 2547ab4382d2SGreg Kroah-Hartman if (!normal) 2548ab4382d2SGreg Kroah-Hartman goto out_kfree; 2549ab4382d2SGreg Kroah-Hartman 2550ab4382d2SGreg Kroah-Hartman drv->tty_driver = normal; 2551ab4382d2SGreg Kroah-Hartman 2552ab4382d2SGreg Kroah-Hartman normal->driver_name = drv->driver_name; 2553ab4382d2SGreg Kroah-Hartman normal->name = drv->dev_name; 2554ab4382d2SGreg Kroah-Hartman normal->major = drv->major; 2555ab4382d2SGreg Kroah-Hartman normal->minor_start = drv->minor; 2556ab4382d2SGreg Kroah-Hartman normal->type = TTY_DRIVER_TYPE_SERIAL; 2557ab4382d2SGreg Kroah-Hartman normal->subtype = SERIAL_TYPE_NORMAL; 2558ab4382d2SGreg Kroah-Hartman normal->init_termios = tty_std_termios; 2559ab4382d2SGreg Kroah-Hartman normal->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; 2560ab4382d2SGreg Kroah-Hartman normal->init_termios.c_ispeed = normal->init_termios.c_ospeed = 9600; 2561ab4382d2SGreg Kroah-Hartman normal->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; 2562ab4382d2SGreg Kroah-Hartman normal->driver_state = drv; 2563ab4382d2SGreg Kroah-Hartman tty_set_operations(normal, &uart_ops); 2564ab4382d2SGreg Kroah-Hartman 2565ab4382d2SGreg Kroah-Hartman /* 2566ab4382d2SGreg Kroah-Hartman * Initialise the UART state(s). 2567ab4382d2SGreg Kroah-Hartman */ 2568ab4382d2SGreg Kroah-Hartman for (i = 0; i < drv->nr; i++) { 2569ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + i; 2570ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2571ab4382d2SGreg Kroah-Hartman 2572ab4382d2SGreg Kroah-Hartman tty_port_init(port); 2573ab4382d2SGreg Kroah-Hartman port->ops = &uart_port_ops; 2574ab4382d2SGreg Kroah-Hartman } 2575ab4382d2SGreg Kroah-Hartman 2576ab4382d2SGreg Kroah-Hartman retval = tty_register_driver(normal); 2577ab4382d2SGreg Kroah-Hartman if (retval >= 0) 2578ab4382d2SGreg Kroah-Hartman return retval; 2579ab4382d2SGreg Kroah-Hartman 2580191c5f10SJiri Slaby for (i = 0; i < drv->nr; i++) 2581191c5f10SJiri Slaby tty_port_destroy(&drv->state[i].port); 2582ab4382d2SGreg Kroah-Hartman put_tty_driver(normal); 2583ab4382d2SGreg Kroah-Hartman out_kfree: 2584ab4382d2SGreg Kroah-Hartman kfree(drv->state); 2585ab4382d2SGreg Kroah-Hartman out: 2586050dfc09SSergey Organov return retval; 2587ab4382d2SGreg Kroah-Hartman } 2588ab4382d2SGreg Kroah-Hartman 2589ab4382d2SGreg Kroah-Hartman /** 2590ab4382d2SGreg Kroah-Hartman * uart_unregister_driver - remove a driver from the uart core layer 2591ab4382d2SGreg Kroah-Hartman * @drv: low level driver structure 2592ab4382d2SGreg Kroah-Hartman * 2593ab4382d2SGreg Kroah-Hartman * Remove all references to a driver from the core driver. The low 2594ab4382d2SGreg Kroah-Hartman * level driver must have removed all its ports via the 2595ab4382d2SGreg Kroah-Hartman * uart_remove_one_port() if it registered them with uart_add_one_port(). 2596ab4382d2SGreg Kroah-Hartman * (ie, drv->port == NULL) 2597ab4382d2SGreg Kroah-Hartman */ 2598ab4382d2SGreg Kroah-Hartman void uart_unregister_driver(struct uart_driver *drv) 2599ab4382d2SGreg Kroah-Hartman { 2600ab4382d2SGreg Kroah-Hartman struct tty_driver *p = drv->tty_driver; 2601191c5f10SJiri Slaby unsigned int i; 2602191c5f10SJiri Slaby 2603ab4382d2SGreg Kroah-Hartman tty_unregister_driver(p); 2604ab4382d2SGreg Kroah-Hartman put_tty_driver(p); 2605191c5f10SJiri Slaby for (i = 0; i < drv->nr; i++) 2606191c5f10SJiri Slaby tty_port_destroy(&drv->state[i].port); 2607ab4382d2SGreg Kroah-Hartman kfree(drv->state); 26081e66cdedSAlan Cox drv->state = NULL; 2609ab4382d2SGreg Kroah-Hartman drv->tty_driver = NULL; 2610ab4382d2SGreg Kroah-Hartman } 2611ab4382d2SGreg Kroah-Hartman 2612ab4382d2SGreg Kroah-Hartman struct tty_driver *uart_console_device(struct console *co, int *index) 2613ab4382d2SGreg Kroah-Hartman { 2614ab4382d2SGreg Kroah-Hartman struct uart_driver *p = co->data; 2615ab4382d2SGreg Kroah-Hartman *index = co->index; 2616ab4382d2SGreg Kroah-Hartman return p->tty_driver; 2617ab4382d2SGreg Kroah-Hartman } 2618488f49acSJohn Stultz EXPORT_SYMBOL_GPL(uart_console_device); 2619ab4382d2SGreg Kroah-Hartman 2620143c02c8SAndy Shevchenko static ssize_t uartclk_show(struct device *dev, 26216915c0e4STomas Hlavacek struct device_attribute *attr, char *buf) 26226915c0e4STomas Hlavacek { 2623bebe73e3SAlan Cox struct serial_struct tmp; 26246915c0e4STomas Hlavacek struct tty_port *port = dev_get_drvdata(dev); 2625b1b79916STomas Hlavacek 26269f109694SAlan Cox uart_get_info(port, &tmp); 2627bebe73e3SAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.baud_base * 16); 26286915c0e4STomas Hlavacek } 26296915c0e4STomas Hlavacek 2630143c02c8SAndy Shevchenko static ssize_t type_show(struct device *dev, 2631373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2632373bac4cSAlan Cox { 2633373bac4cSAlan Cox struct serial_struct tmp; 2634373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2635373bac4cSAlan Cox 2636373bac4cSAlan Cox uart_get_info(port, &tmp); 2637373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.type); 2638373bac4cSAlan Cox } 2639143c02c8SAndy Shevchenko 2640143c02c8SAndy Shevchenko static ssize_t line_show(struct device *dev, 2641373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2642373bac4cSAlan Cox { 2643373bac4cSAlan Cox struct serial_struct tmp; 2644373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2645373bac4cSAlan Cox 2646373bac4cSAlan Cox uart_get_info(port, &tmp); 2647373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.line); 2648373bac4cSAlan Cox } 2649373bac4cSAlan Cox 2650143c02c8SAndy Shevchenko static ssize_t port_show(struct device *dev, 2651373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2652373bac4cSAlan Cox { 2653373bac4cSAlan Cox struct serial_struct tmp; 2654373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2655fd985e1dSAndrew Morton unsigned long ioaddr; 2656373bac4cSAlan Cox 2657373bac4cSAlan Cox uart_get_info(port, &tmp); 2658fd985e1dSAndrew Morton ioaddr = tmp.port; 2659fd985e1dSAndrew Morton if (HIGH_BITS_OFFSET) 2660fd985e1dSAndrew Morton ioaddr |= (unsigned long)tmp.port_high << HIGH_BITS_OFFSET; 2661fd985e1dSAndrew Morton return snprintf(buf, PAGE_SIZE, "0x%lX\n", ioaddr); 2662373bac4cSAlan Cox } 2663373bac4cSAlan Cox 2664143c02c8SAndy Shevchenko static ssize_t irq_show(struct device *dev, 2665373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2666373bac4cSAlan Cox { 2667373bac4cSAlan Cox struct serial_struct tmp; 2668373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2669373bac4cSAlan Cox 2670373bac4cSAlan Cox uart_get_info(port, &tmp); 2671373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.irq); 2672373bac4cSAlan Cox } 2673373bac4cSAlan Cox 2674143c02c8SAndy Shevchenko static ssize_t flags_show(struct device *dev, 2675373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2676373bac4cSAlan Cox { 2677373bac4cSAlan Cox struct serial_struct tmp; 2678373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2679373bac4cSAlan Cox 2680373bac4cSAlan Cox uart_get_info(port, &tmp); 2681373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "0x%X\n", tmp.flags); 2682373bac4cSAlan Cox } 2683373bac4cSAlan Cox 2684143c02c8SAndy Shevchenko static ssize_t xmit_fifo_size_show(struct device *dev, 2685373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2686373bac4cSAlan Cox { 2687373bac4cSAlan Cox struct serial_struct tmp; 2688373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2689373bac4cSAlan Cox 2690373bac4cSAlan Cox uart_get_info(port, &tmp); 2691373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.xmit_fifo_size); 2692373bac4cSAlan Cox } 2693373bac4cSAlan Cox 2694143c02c8SAndy Shevchenko static ssize_t close_delay_show(struct device *dev, 2695373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2696373bac4cSAlan Cox { 2697373bac4cSAlan Cox struct serial_struct tmp; 2698373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2699373bac4cSAlan Cox 2700373bac4cSAlan Cox uart_get_info(port, &tmp); 2701373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.close_delay); 2702373bac4cSAlan Cox } 2703373bac4cSAlan Cox 2704143c02c8SAndy Shevchenko static ssize_t closing_wait_show(struct device *dev, 2705373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2706373bac4cSAlan Cox { 2707373bac4cSAlan Cox struct serial_struct tmp; 2708373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2709373bac4cSAlan Cox 2710373bac4cSAlan Cox uart_get_info(port, &tmp); 2711373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.closing_wait); 2712373bac4cSAlan Cox } 2713373bac4cSAlan Cox 2714143c02c8SAndy Shevchenko static ssize_t custom_divisor_show(struct device *dev, 2715373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2716373bac4cSAlan Cox { 2717373bac4cSAlan Cox struct serial_struct tmp; 2718373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2719373bac4cSAlan Cox 2720373bac4cSAlan Cox uart_get_info(port, &tmp); 2721373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.custom_divisor); 2722373bac4cSAlan Cox } 2723373bac4cSAlan Cox 2724143c02c8SAndy Shevchenko static ssize_t io_type_show(struct device *dev, 2725373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2726373bac4cSAlan Cox { 2727373bac4cSAlan Cox struct serial_struct tmp; 2728373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2729373bac4cSAlan Cox 2730373bac4cSAlan Cox uart_get_info(port, &tmp); 2731373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.io_type); 2732373bac4cSAlan Cox } 2733373bac4cSAlan Cox 2734143c02c8SAndy Shevchenko static ssize_t iomem_base_show(struct device *dev, 2735373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2736373bac4cSAlan Cox { 2737373bac4cSAlan Cox struct serial_struct tmp; 2738373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2739373bac4cSAlan Cox 2740373bac4cSAlan Cox uart_get_info(port, &tmp); 2741373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "0x%lX\n", (unsigned long)tmp.iomem_base); 2742373bac4cSAlan Cox } 2743373bac4cSAlan Cox 2744143c02c8SAndy Shevchenko static ssize_t iomem_reg_shift_show(struct device *dev, 2745373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2746373bac4cSAlan Cox { 2747373bac4cSAlan Cox struct serial_struct tmp; 2748373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2749373bac4cSAlan Cox 2750373bac4cSAlan Cox uart_get_info(port, &tmp); 2751373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.iomem_reg_shift); 2752373bac4cSAlan Cox } 2753373bac4cSAlan Cox 2754143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(uartclk); 2755143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(type); 2756143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(line); 2757143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(port); 2758143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(irq); 2759143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(flags); 2760143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(xmit_fifo_size); 2761143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(close_delay); 2762143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(closing_wait); 2763143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(custom_divisor); 2764143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(io_type); 2765143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(iomem_base); 2766143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(iomem_reg_shift); 27676915c0e4STomas Hlavacek 27686915c0e4STomas Hlavacek static struct attribute *tty_dev_attrs[] = { 2769143c02c8SAndy Shevchenko &dev_attr_uartclk.attr, 2770373bac4cSAlan Cox &dev_attr_type.attr, 2771373bac4cSAlan Cox &dev_attr_line.attr, 2772373bac4cSAlan Cox &dev_attr_port.attr, 2773373bac4cSAlan Cox &dev_attr_irq.attr, 2774373bac4cSAlan Cox &dev_attr_flags.attr, 2775373bac4cSAlan Cox &dev_attr_xmit_fifo_size.attr, 2776373bac4cSAlan Cox &dev_attr_close_delay.attr, 2777373bac4cSAlan Cox &dev_attr_closing_wait.attr, 2778373bac4cSAlan Cox &dev_attr_custom_divisor.attr, 2779373bac4cSAlan Cox &dev_attr_io_type.attr, 2780373bac4cSAlan Cox &dev_attr_iomem_base.attr, 2781373bac4cSAlan Cox &dev_attr_iomem_reg_shift.attr, 27826915c0e4STomas Hlavacek NULL, 27836915c0e4STomas Hlavacek }; 27846915c0e4STomas Hlavacek 2785b1b79916STomas Hlavacek static const struct attribute_group tty_dev_attr_group = { 27866915c0e4STomas Hlavacek .attrs = tty_dev_attrs, 27876915c0e4STomas Hlavacek }; 27886915c0e4STomas Hlavacek 2789ab4382d2SGreg Kroah-Hartman /** 2790ab4382d2SGreg Kroah-Hartman * uart_add_one_port - attach a driver-defined port structure 2791ab4382d2SGreg Kroah-Hartman * @drv: pointer to the uart low level driver structure for this port 2792ab4382d2SGreg Kroah-Hartman * @uport: uart port structure to use for this port. 2793ab4382d2SGreg Kroah-Hartman * 2794ab4382d2SGreg Kroah-Hartman * This allows the driver to register its own uart_port structure 2795ab4382d2SGreg Kroah-Hartman * with the core driver. The main purpose is to allow the low 2796ab4382d2SGreg Kroah-Hartman * level uart drivers to expand uart_port, rather than having yet 2797ab4382d2SGreg Kroah-Hartman * more levels of structures. 2798ab4382d2SGreg Kroah-Hartman */ 2799ab4382d2SGreg Kroah-Hartman int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport) 2800ab4382d2SGreg Kroah-Hartman { 2801ab4382d2SGreg Kroah-Hartman struct uart_state *state; 2802ab4382d2SGreg Kroah-Hartman struct tty_port *port; 2803ab4382d2SGreg Kroah-Hartman int ret = 0; 2804ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 2805266dcff0SGreg Kroah-Hartman int num_groups; 2806ab4382d2SGreg Kroah-Hartman 2807ab4382d2SGreg Kroah-Hartman BUG_ON(in_interrupt()); 2808ab4382d2SGreg Kroah-Hartman 2809ab4382d2SGreg Kroah-Hartman if (uport->line >= drv->nr) 2810ab4382d2SGreg Kroah-Hartman return -EINVAL; 2811ab4382d2SGreg Kroah-Hartman 2812ab4382d2SGreg Kroah-Hartman state = drv->state + uport->line; 2813ab4382d2SGreg Kroah-Hartman port = &state->port; 2814ab4382d2SGreg Kroah-Hartman 2815ab4382d2SGreg Kroah-Hartman mutex_lock(&port_mutex); 2816ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2817ab4382d2SGreg Kroah-Hartman if (state->uart_port) { 2818ab4382d2SGreg Kroah-Hartman ret = -EINVAL; 2819ab4382d2SGreg Kroah-Hartman goto out; 2820ab4382d2SGreg Kroah-Hartman } 2821ab4382d2SGreg Kroah-Hartman 28222b702b9bSPeter Hurley /* Link the port to the driver state table and vice versa */ 28239ed19428SPeter Hurley atomic_set(&state->refcount, 1); 28249ed19428SPeter Hurley init_waitqueue_head(&state->remove_wait); 2825ab4382d2SGreg Kroah-Hartman state->uart_port = uport; 2826ab4382d2SGreg Kroah-Hartman uport->state = state; 2827ab4382d2SGreg Kroah-Hartman 28282b702b9bSPeter Hurley state->pm_state = UART_PM_STATE_UNDEFINED; 28292b702b9bSPeter Hurley uport->cons = drv->cons; 2830959801feSPeter Hurley uport->minor = drv->tty_driver->minor_start + uport->line; 2831f7048b15SVignesh R uport->name = kasprintf(GFP_KERNEL, "%s%d", drv->dev_name, 2832f7048b15SVignesh R drv->tty_driver->name_base + uport->line); 2833f7048b15SVignesh R if (!uport->name) { 2834f7048b15SVignesh R ret = -ENOMEM; 2835f7048b15SVignesh R goto out; 2836f7048b15SVignesh R } 28372b702b9bSPeter Hurley 2838d2403cadSAndy Shevchenko uart_port_spin_lock_init(uport); 2839d2403cadSAndy Shevchenko 2840a208ffd2SGrant Likely if (uport->cons && uport->dev) 2841dd8b7a1dSMichal Simek of_console_check(uport->dev->of_node, uport->cons->name, uport->line); 2842ab4382d2SGreg Kroah-Hartman 2843fb2b9001SSudip Mukherjee tty_port_link_device(port, drv->tty_driver, uport->line); 2844ab4382d2SGreg Kroah-Hartman uart_configure_port(drv, state, uport); 2845ab4382d2SGreg Kroah-Hartman 28464dda864dSGeert Uytterhoeven port->console = uart_console(uport); 28474dda864dSGeert Uytterhoeven 2848266dcff0SGreg Kroah-Hartman num_groups = 2; 2849266dcff0SGreg Kroah-Hartman if (uport->attr_group) 2850266dcff0SGreg Kroah-Hartman num_groups++; 2851266dcff0SGreg Kroah-Hartman 2852c2b703b8SYoshihiro YUNOMAE uport->tty_groups = kcalloc(num_groups, sizeof(*uport->tty_groups), 2853266dcff0SGreg Kroah-Hartman GFP_KERNEL); 2854266dcff0SGreg Kroah-Hartman if (!uport->tty_groups) { 2855266dcff0SGreg Kroah-Hartman ret = -ENOMEM; 2856266dcff0SGreg Kroah-Hartman goto out; 2857266dcff0SGreg Kroah-Hartman } 2858266dcff0SGreg Kroah-Hartman uport->tty_groups[0] = &tty_dev_attr_group; 2859266dcff0SGreg Kroah-Hartman if (uport->attr_group) 2860266dcff0SGreg Kroah-Hartman uport->tty_groups[1] = uport->attr_group; 2861266dcff0SGreg Kroah-Hartman 2862ab4382d2SGreg Kroah-Hartman /* 2863ab4382d2SGreg Kroah-Hartman * Register the port whether it's detected or not. This allows 2864015355b7SGeert Uytterhoeven * setserial to be used to alter this port's parameters. 2865ab4382d2SGreg Kroah-Hartman */ 2866da4c2799SJohan Hovold tty_dev = tty_port_register_device_attr_serdev(port, drv->tty_driver, 2867266dcff0SGreg Kroah-Hartman uport->line, uport->dev, port, uport->tty_groups); 2868b289c496SChengguang Xu if (!IS_ERR(tty_dev)) { 286977359835SSimon Glass device_set_wakeup_capable(tty_dev, 1); 287077359835SSimon Glass } else { 28712f2dafe7SSudip Mukherjee dev_err(uport->dev, "Cannot register tty device on line %d\n", 2872ab4382d2SGreg Kroah-Hartman uport->line); 287377359835SSimon Glass } 2874ab4382d2SGreg Kroah-Hartman 2875ab4382d2SGreg Kroah-Hartman /* 2876ab4382d2SGreg Kroah-Hartman * Ensure UPF_DEAD is not set. 2877ab4382d2SGreg Kroah-Hartman */ 2878ab4382d2SGreg Kroah-Hartman uport->flags &= ~UPF_DEAD; 2879ab4382d2SGreg Kroah-Hartman 2880ab4382d2SGreg Kroah-Hartman out: 2881ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2882ab4382d2SGreg Kroah-Hartman mutex_unlock(&port_mutex); 2883ab4382d2SGreg Kroah-Hartman 2884ab4382d2SGreg Kroah-Hartman return ret; 2885ab4382d2SGreg Kroah-Hartman } 2886ab4382d2SGreg Kroah-Hartman 2887ab4382d2SGreg Kroah-Hartman /** 2888ab4382d2SGreg Kroah-Hartman * uart_remove_one_port - detach a driver defined port structure 2889ab4382d2SGreg Kroah-Hartman * @drv: pointer to the uart low level driver structure for this port 2890ab4382d2SGreg Kroah-Hartman * @uport: uart port structure for this port 2891ab4382d2SGreg Kroah-Hartman * 2892ab4382d2SGreg Kroah-Hartman * This unhooks (and hangs up) the specified port structure from the 2893ab4382d2SGreg Kroah-Hartman * core driver. No further calls will be made to the low-level code 2894ab4382d2SGreg Kroah-Hartman * for this port. 2895ab4382d2SGreg Kroah-Hartman */ 2896ab4382d2SGreg Kroah-Hartman int uart_remove_one_port(struct uart_driver *drv, struct uart_port *uport) 2897ab4382d2SGreg Kroah-Hartman { 2898ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 2899ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 29004047b371SPeter Hurley struct uart_port *uart_port; 29014c6d5b4dSGeert Uytterhoeven struct tty_struct *tty; 2902b342dd51SChen Gang int ret = 0; 2903ab4382d2SGreg Kroah-Hartman 2904ab4382d2SGreg Kroah-Hartman BUG_ON(in_interrupt()); 2905ab4382d2SGreg Kroah-Hartman 2906ab4382d2SGreg Kroah-Hartman mutex_lock(&port_mutex); 2907ab4382d2SGreg Kroah-Hartman 2908ab4382d2SGreg Kroah-Hartman /* 2909ab4382d2SGreg Kroah-Hartman * Mark the port "dead" - this prevents any opens from 2910ab4382d2SGreg Kroah-Hartman * succeeding while we shut down the port. 2911ab4382d2SGreg Kroah-Hartman */ 2912ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 29134047b371SPeter Hurley uart_port = uart_port_check(state); 29144047b371SPeter Hurley if (uart_port != uport) 29154047b371SPeter Hurley dev_alert(uport->dev, "Removing wrong port: %p != %p\n", 29164047b371SPeter Hurley uart_port, uport); 29174047b371SPeter Hurley 29184047b371SPeter Hurley if (!uart_port) { 2919b342dd51SChen Gang mutex_unlock(&port->mutex); 2920b342dd51SChen Gang ret = -EINVAL; 2921b342dd51SChen Gang goto out; 2922b342dd51SChen Gang } 2923ab4382d2SGreg Kroah-Hartman uport->flags |= UPF_DEAD; 2924ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2925ab4382d2SGreg Kroah-Hartman 2926ab4382d2SGreg Kroah-Hartman /* 2927ab4382d2SGreg Kroah-Hartman * Remove the devices from the tty layer 2928ab4382d2SGreg Kroah-Hartman */ 2929da4c2799SJohan Hovold tty_port_unregister_device(port, drv->tty_driver, uport->line); 2930ab4382d2SGreg Kroah-Hartman 29314c6d5b4dSGeert Uytterhoeven tty = tty_port_tty_get(port); 29324c6d5b4dSGeert Uytterhoeven if (tty) { 2933ab4382d2SGreg Kroah-Hartman tty_vhangup(port->tty); 29344c6d5b4dSGeert Uytterhoeven tty_kref_put(tty); 29354c6d5b4dSGeert Uytterhoeven } 2936ab4382d2SGreg Kroah-Hartman 2937ab4382d2SGreg Kroah-Hartman /* 29385f5c9ae5SGeert Uytterhoeven * If the port is used as a console, unregister it 29395f5c9ae5SGeert Uytterhoeven */ 29405f5c9ae5SGeert Uytterhoeven if (uart_console(uport)) 29415f5c9ae5SGeert Uytterhoeven unregister_console(uport->cons); 29425f5c9ae5SGeert Uytterhoeven 29435f5c9ae5SGeert Uytterhoeven /* 2944ab4382d2SGreg Kroah-Hartman * Free the port IO and memory resources, if any. 2945ab4382d2SGreg Kroah-Hartman */ 2946a7cfaf16SFabio Estevam if (uport->type != PORT_UNKNOWN && uport->ops->release_port) 2947ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 2948266dcff0SGreg Kroah-Hartman kfree(uport->tty_groups); 2949f7048b15SVignesh R kfree(uport->name); 2950ab4382d2SGreg Kroah-Hartman 2951ab4382d2SGreg Kroah-Hartman /* 2952ab4382d2SGreg Kroah-Hartman * Indicate that there isn't a port here anymore. 2953ab4382d2SGreg Kroah-Hartman */ 2954ab4382d2SGreg Kroah-Hartman uport->type = PORT_UNKNOWN; 2955ab4382d2SGreg Kroah-Hartman 29564047b371SPeter Hurley mutex_lock(&port->mutex); 29579ed19428SPeter Hurley WARN_ON(atomic_dec_return(&state->refcount) < 0); 29589ed19428SPeter Hurley wait_event(state->remove_wait, !atomic_read(&state->refcount)); 2959ab4382d2SGreg Kroah-Hartman state->uart_port = NULL; 29604047b371SPeter Hurley mutex_unlock(&port->mutex); 2961b342dd51SChen Gang out: 2962ab4382d2SGreg Kroah-Hartman mutex_unlock(&port_mutex); 2963ab4382d2SGreg Kroah-Hartman 2964b342dd51SChen Gang return ret; 2965ab4382d2SGreg Kroah-Hartman } 2966ab4382d2SGreg Kroah-Hartman 2967ab4382d2SGreg Kroah-Hartman /* 2968ab4382d2SGreg Kroah-Hartman * Are the two ports equivalent? 2969ab4382d2SGreg Kroah-Hartman */ 2970ab4382d2SGreg Kroah-Hartman int uart_match_port(struct uart_port *port1, struct uart_port *port2) 2971ab4382d2SGreg Kroah-Hartman { 2972ab4382d2SGreg Kroah-Hartman if (port1->iotype != port2->iotype) 2973ab4382d2SGreg Kroah-Hartman return 0; 2974ab4382d2SGreg Kroah-Hartman 2975ab4382d2SGreg Kroah-Hartman switch (port1->iotype) { 2976ab4382d2SGreg Kroah-Hartman case UPIO_PORT: 2977ab4382d2SGreg Kroah-Hartman return (port1->iobase == port2->iobase); 2978ab4382d2SGreg Kroah-Hartman case UPIO_HUB6: 2979ab4382d2SGreg Kroah-Hartman return (port1->iobase == port2->iobase) && 2980ab4382d2SGreg Kroah-Hartman (port1->hub6 == port2->hub6); 2981ab4382d2SGreg Kroah-Hartman case UPIO_MEM: 2982bd94c407SMasahiro Yamada case UPIO_MEM16: 2983ab4382d2SGreg Kroah-Hartman case UPIO_MEM32: 29843ffb1a81SKevin Cernekee case UPIO_MEM32BE: 2985ab4382d2SGreg Kroah-Hartman case UPIO_AU: 2986ab4382d2SGreg Kroah-Hartman case UPIO_TSI: 2987ab4382d2SGreg Kroah-Hartman return (port1->mapbase == port2->mapbase); 2988ab4382d2SGreg Kroah-Hartman } 2989ab4382d2SGreg Kroah-Hartman return 0; 2990ab4382d2SGreg Kroah-Hartman } 2991ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_match_port); 2992ab4382d2SGreg Kroah-Hartman 2993027d7dacSJiri Slaby /** 2994027d7dacSJiri Slaby * uart_handle_dcd_change - handle a change of carrier detect state 2995027d7dacSJiri Slaby * @uport: uart_port structure for the open port 2996027d7dacSJiri Slaby * @status: new carrier detect status, nonzero if active 29974d90bb14SPeter Hurley * 29984d90bb14SPeter Hurley * Caller must hold uport->lock 2999027d7dacSJiri Slaby */ 3000027d7dacSJiri Slaby void uart_handle_dcd_change(struct uart_port *uport, unsigned int status) 3001027d7dacSJiri Slaby { 300242381572SGeorge Spelvin struct tty_port *port = &uport->state->port; 300343eca0aeSAlan Cox struct tty_struct *tty = port->tty; 3004c993257bSPeter Hurley struct tty_ldisc *ld; 3005027d7dacSJiri Slaby 30064d90bb14SPeter Hurley lockdep_assert_held_once(&uport->lock); 30074d90bb14SPeter Hurley 3008c993257bSPeter Hurley if (tty) { 3009c993257bSPeter Hurley ld = tty_ldisc_ref(tty); 301042381572SGeorge Spelvin if (ld) { 301142381572SGeorge Spelvin if (ld->ops->dcd_change) 3012593fb1aeSGeorge Spelvin ld->ops->dcd_change(tty, status); 301342381572SGeorge Spelvin tty_ldisc_deref(ld); 301442381572SGeorge Spelvin } 3015c993257bSPeter Hurley } 3016027d7dacSJiri Slaby 3017027d7dacSJiri Slaby uport->icount.dcd++; 3018027d7dacSJiri Slaby 3019299245a1SPeter Hurley if (uart_dcd_enabled(uport)) { 3020027d7dacSJiri Slaby if (status) 3021027d7dacSJiri Slaby wake_up_interruptible(&port->open_wait); 302243eca0aeSAlan Cox else if (tty) 302343eca0aeSAlan Cox tty_hangup(tty); 3024027d7dacSJiri Slaby } 3025027d7dacSJiri Slaby } 3026027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_handle_dcd_change); 3027027d7dacSJiri Slaby 3028027d7dacSJiri Slaby /** 3029027d7dacSJiri Slaby * uart_handle_cts_change - handle a change of clear-to-send state 3030027d7dacSJiri Slaby * @uport: uart_port structure for the open port 3031027d7dacSJiri Slaby * @status: new clear to send status, nonzero if active 30324d90bb14SPeter Hurley * 30334d90bb14SPeter Hurley * Caller must hold uport->lock 3034027d7dacSJiri Slaby */ 3035027d7dacSJiri Slaby void uart_handle_cts_change(struct uart_port *uport, unsigned int status) 3036027d7dacSJiri Slaby { 30374d90bb14SPeter Hurley lockdep_assert_held_once(&uport->lock); 30384d90bb14SPeter Hurley 3039027d7dacSJiri Slaby uport->icount.cts++; 3040027d7dacSJiri Slaby 3041391f93f2SPeter Hurley if (uart_softcts_mode(uport)) { 3042d01f4d18SPeter Hurley if (uport->hw_stopped) { 3043027d7dacSJiri Slaby if (status) { 3044d01f4d18SPeter Hurley uport->hw_stopped = 0; 3045027d7dacSJiri Slaby uport->ops->start_tx(uport); 3046027d7dacSJiri Slaby uart_write_wakeup(uport); 3047027d7dacSJiri Slaby } 3048027d7dacSJiri Slaby } else { 3049027d7dacSJiri Slaby if (!status) { 3050d01f4d18SPeter Hurley uport->hw_stopped = 1; 3051027d7dacSJiri Slaby uport->ops->stop_tx(uport); 3052027d7dacSJiri Slaby } 3053027d7dacSJiri Slaby } 3054391f93f2SPeter Hurley 3055027d7dacSJiri Slaby } 3056027d7dacSJiri Slaby } 3057027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_handle_cts_change); 3058027d7dacSJiri Slaby 3059cf75525fSJiri Slaby /** 3060cf75525fSJiri Slaby * uart_insert_char - push a char to the uart layer 3061cf75525fSJiri Slaby * 3062cf75525fSJiri Slaby * User is responsible to call tty_flip_buffer_push when they are done with 3063cf75525fSJiri Slaby * insertion. 3064cf75525fSJiri Slaby * 3065cf75525fSJiri Slaby * @port: corresponding port 3066cf75525fSJiri Slaby * @status: state of the serial port RX buffer (LSR for 8250) 3067cf75525fSJiri Slaby * @overrun: mask of overrun bits in @status 3068cf75525fSJiri Slaby * @ch: character to push 3069cf75525fSJiri Slaby * @flag: flag for the character (see TTY_NORMAL and friends) 3070cf75525fSJiri Slaby */ 3071027d7dacSJiri Slaby void uart_insert_char(struct uart_port *port, unsigned int status, 3072027d7dacSJiri Slaby unsigned int overrun, unsigned int ch, unsigned int flag) 3073027d7dacSJiri Slaby { 307492a19f9cSJiri Slaby struct tty_port *tport = &port->state->port; 3075027d7dacSJiri Slaby 3076027d7dacSJiri Slaby if ((status & port->ignore_status_mask & ~overrun) == 0) 307792a19f9cSJiri Slaby if (tty_insert_flip_char(tport, ch, flag) == 0) 3078dabfb351SCorbin ++port->icount.buf_overrun; 3079027d7dacSJiri Slaby 3080027d7dacSJiri Slaby /* 3081027d7dacSJiri Slaby * Overrun is special. Since it's reported immediately, 3082027d7dacSJiri Slaby * it doesn't affect the current character. 3083027d7dacSJiri Slaby */ 3084027d7dacSJiri Slaby if (status & ~port->ignore_status_mask & overrun) 308592a19f9cSJiri Slaby if (tty_insert_flip_char(tport, 0, TTY_OVERRUN) == 0) 3086dabfb351SCorbin ++port->icount.buf_overrun; 3087027d7dacSJiri Slaby } 3088027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_insert_char); 3089027d7dacSJiri Slaby 309068af4317SDmitry Safonov #ifdef CONFIG_MAGIC_SYSRQ_SERIAL 309168af4317SDmitry Safonov static const char sysrq_toggle_seq[] = CONFIG_MAGIC_SYSRQ_SERIAL_SEQUENCE; 309268af4317SDmitry Safonov 309368af4317SDmitry Safonov static void uart_sysrq_on(struct work_struct *w) 309468af4317SDmitry Safonov { 3095b18896ffSAndy Shevchenko int sysrq_toggle_seq_len = strlen(sysrq_toggle_seq); 3096b18896ffSAndy Shevchenko 309768af4317SDmitry Safonov sysrq_toggle_support(1); 3098b18896ffSAndy Shevchenko pr_info("SysRq is enabled by magic sequence '%*pE' on serial\n", 3099b18896ffSAndy Shevchenko sysrq_toggle_seq_len, sysrq_toggle_seq); 310068af4317SDmitry Safonov } 310168af4317SDmitry Safonov static DECLARE_WORK(sysrq_enable_work, uart_sysrq_on); 310268af4317SDmitry Safonov 310368af4317SDmitry Safonov /** 310468af4317SDmitry Safonov * uart_try_toggle_sysrq - Enables SysRq from serial line 310568af4317SDmitry Safonov * @port: uart_port structure where char(s) after BREAK met 310668af4317SDmitry Safonov * @ch: new character in the sequence after received BREAK 310768af4317SDmitry Safonov * 310868af4317SDmitry Safonov * Enables magic SysRq when the required sequence is met on port 310968af4317SDmitry Safonov * (see CONFIG_MAGIC_SYSRQ_SERIAL_SEQUENCE). 311068af4317SDmitry Safonov * 311168af4317SDmitry Safonov * Returns false if @ch is out of enabling sequence and should be 311268af4317SDmitry Safonov * handled some other way, true if @ch was consumed. 311368af4317SDmitry Safonov */ 311468af4317SDmitry Safonov static bool uart_try_toggle_sysrq(struct uart_port *port, unsigned int ch) 311568af4317SDmitry Safonov { 31162ce5eaceSAndy Shevchenko int sysrq_toggle_seq_len = strlen(sysrq_toggle_seq); 31172ce5eaceSAndy Shevchenko 31182ce5eaceSAndy Shevchenko if (!sysrq_toggle_seq_len) 311968af4317SDmitry Safonov return false; 312068af4317SDmitry Safonov 312168af4317SDmitry Safonov BUILD_BUG_ON(ARRAY_SIZE(sysrq_toggle_seq) >= U8_MAX); 312268af4317SDmitry Safonov if (sysrq_toggle_seq[port->sysrq_seq] != ch) { 312368af4317SDmitry Safonov port->sysrq_seq = 0; 312468af4317SDmitry Safonov return false; 312568af4317SDmitry Safonov } 312668af4317SDmitry Safonov 31272ce5eaceSAndy Shevchenko if (++port->sysrq_seq < sysrq_toggle_seq_len) { 312868af4317SDmitry Safonov port->sysrq = jiffies + SYSRQ_TIMEOUT; 312968af4317SDmitry Safonov return true; 313068af4317SDmitry Safonov } 313168af4317SDmitry Safonov 313268af4317SDmitry Safonov schedule_work(&sysrq_enable_work); 313368af4317SDmitry Safonov 313468af4317SDmitry Safonov port->sysrq = 0; 313568af4317SDmitry Safonov return true; 313668af4317SDmitry Safonov } 313768af4317SDmitry Safonov #else 313868af4317SDmitry Safonov static inline bool uart_try_toggle_sysrq(struct uart_port *port, unsigned int ch) 313968af4317SDmitry Safonov { 314068af4317SDmitry Safonov return false; 314168af4317SDmitry Safonov } 314268af4317SDmitry Safonov #endif 314368af4317SDmitry Safonov 31448e20fc39SDmitry Safonov int uart_handle_sysrq_char(struct uart_port *port, unsigned int ch) 31458e20fc39SDmitry Safonov { 31468e20fc39SDmitry Safonov if (!IS_ENABLED(CONFIG_MAGIC_SYSRQ_SERIAL)) 31478e20fc39SDmitry Safonov return 0; 31488e20fc39SDmitry Safonov 31498e20fc39SDmitry Safonov if (!port->has_sysrq || !port->sysrq) 31508e20fc39SDmitry Safonov return 0; 31518e20fc39SDmitry Safonov 31528e20fc39SDmitry Safonov if (ch && time_before(jiffies, port->sysrq)) { 315368af4317SDmitry Safonov if (sysrq_mask()) { 31548e20fc39SDmitry Safonov handle_sysrq(ch); 31558e20fc39SDmitry Safonov port->sysrq = 0; 31568e20fc39SDmitry Safonov return 1; 31578e20fc39SDmitry Safonov } 315868af4317SDmitry Safonov if (uart_try_toggle_sysrq(port, ch)) 315968af4317SDmitry Safonov return 1; 316068af4317SDmitry Safonov } 31618e20fc39SDmitry Safonov port->sysrq = 0; 31628e20fc39SDmitry Safonov 31638e20fc39SDmitry Safonov return 0; 31648e20fc39SDmitry Safonov } 31658e20fc39SDmitry Safonov EXPORT_SYMBOL_GPL(uart_handle_sysrq_char); 31668e20fc39SDmitry Safonov 31678e20fc39SDmitry Safonov int uart_prepare_sysrq_char(struct uart_port *port, unsigned int ch) 31688e20fc39SDmitry Safonov { 31698e20fc39SDmitry Safonov if (!IS_ENABLED(CONFIG_MAGIC_SYSRQ_SERIAL)) 31708e20fc39SDmitry Safonov return 0; 31718e20fc39SDmitry Safonov 31728e20fc39SDmitry Safonov if (!port->has_sysrq || !port->sysrq) 31738e20fc39SDmitry Safonov return 0; 31748e20fc39SDmitry Safonov 31758e20fc39SDmitry Safonov if (ch && time_before(jiffies, port->sysrq)) { 317668af4317SDmitry Safonov if (sysrq_mask()) { 31778e20fc39SDmitry Safonov port->sysrq_ch = ch; 31788e20fc39SDmitry Safonov port->sysrq = 0; 31798e20fc39SDmitry Safonov return 1; 31808e20fc39SDmitry Safonov } 318168af4317SDmitry Safonov if (uart_try_toggle_sysrq(port, ch)) 318268af4317SDmitry Safonov return 1; 318368af4317SDmitry Safonov } 31848e20fc39SDmitry Safonov port->sysrq = 0; 31858e20fc39SDmitry Safonov 31868e20fc39SDmitry Safonov return 0; 31878e20fc39SDmitry Safonov } 31888e20fc39SDmitry Safonov EXPORT_SYMBOL_GPL(uart_prepare_sysrq_char); 31898e20fc39SDmitry Safonov 3190da9a5aa3SAndy Shevchenko void uart_unlock_and_check_sysrq(struct uart_port *port, unsigned long flags) 3191da9a5aa3SAndy Shevchenko __releases(&port->lock) 31928e20fc39SDmitry Safonov { 3193da9a5aa3SAndy Shevchenko if (port->has_sysrq) { 3194da9a5aa3SAndy Shevchenko int sysrq_ch = port->sysrq_ch; 31958e20fc39SDmitry Safonov 31968e20fc39SDmitry Safonov port->sysrq_ch = 0; 3197da9a5aa3SAndy Shevchenko spin_unlock_irqrestore(&port->lock, flags); 31988e20fc39SDmitry Safonov if (sysrq_ch) 31998e20fc39SDmitry Safonov handle_sysrq(sysrq_ch); 3200da9a5aa3SAndy Shevchenko } else { 3201da9a5aa3SAndy Shevchenko spin_unlock_irqrestore(&port->lock, flags); 3202da9a5aa3SAndy Shevchenko } 32038e20fc39SDmitry Safonov } 32048e20fc39SDmitry Safonov EXPORT_SYMBOL_GPL(uart_unlock_and_check_sysrq); 32058e20fc39SDmitry Safonov 32068e20fc39SDmitry Safonov /* 32078e20fc39SDmitry Safonov * We do the SysRQ and SAK checking like this... 32088e20fc39SDmitry Safonov */ 32098e20fc39SDmitry Safonov int uart_handle_break(struct uart_port *port) 32108e20fc39SDmitry Safonov { 32118e20fc39SDmitry Safonov struct uart_state *state = port->state; 32128e20fc39SDmitry Safonov 32138e20fc39SDmitry Safonov if (port->handle_break) 32148e20fc39SDmitry Safonov port->handle_break(port); 32158e20fc39SDmitry Safonov 3216e140ef36SAndy Shevchenko if (port->has_sysrq && uart_console(port)) { 32178e20fc39SDmitry Safonov if (!port->sysrq) { 321868af4317SDmitry Safonov port->sysrq = jiffies + SYSRQ_TIMEOUT; 32198e20fc39SDmitry Safonov return 1; 32208e20fc39SDmitry Safonov } 32218e20fc39SDmitry Safonov port->sysrq = 0; 32228e20fc39SDmitry Safonov } 32238e20fc39SDmitry Safonov 32248e20fc39SDmitry Safonov if (port->flags & UPF_SAK) 32258e20fc39SDmitry Safonov do_SAK(state->port.tty); 32268e20fc39SDmitry Safonov return 0; 32278e20fc39SDmitry Safonov } 32288e20fc39SDmitry Safonov EXPORT_SYMBOL_GPL(uart_handle_break); 32298e20fc39SDmitry Safonov 3230ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_write_wakeup); 3231ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_register_driver); 3232ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_unregister_driver); 3233ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_suspend_port); 3234ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_resume_port); 3235ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_add_one_port); 3236ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_remove_one_port); 3237ab4382d2SGreg Kroah-Hartman 3238ef838a81SUwe Kleine-König /** 3239743f93f8SLukas Wunner * uart_get_rs485_mode() - retrieve rs485 properties for given uart 3240743f93f8SLukas Wunner * @dev: uart device 3241ef838a81SUwe Kleine-König * @rs485conf: output parameter 3242ef838a81SUwe Kleine-König * 3243ef838a81SUwe Kleine-König * This function implements the device tree binding described in 3244ef838a81SUwe Kleine-König * Documentation/devicetree/bindings/serial/rs485.txt. 3245ef838a81SUwe Kleine-König */ 3246743f93f8SLukas Wunner void uart_get_rs485_mode(struct device *dev, struct serial_rs485 *rs485conf) 3247ef838a81SUwe Kleine-König { 3248ef838a81SUwe Kleine-König u32 rs485_delay[2]; 3249ef838a81SUwe Kleine-König int ret; 3250ef838a81SUwe Kleine-König 3251743f93f8SLukas Wunner ret = device_property_read_u32_array(dev, "rs485-rts-delay", 3252743f93f8SLukas Wunner rs485_delay, 2); 3253ef838a81SUwe Kleine-König if (!ret) { 3254ef838a81SUwe Kleine-König rs485conf->delay_rts_before_send = rs485_delay[0]; 3255ef838a81SUwe Kleine-König rs485conf->delay_rts_after_send = rs485_delay[1]; 3256ef838a81SUwe Kleine-König } else { 3257ef838a81SUwe Kleine-König rs485conf->delay_rts_before_send = 0; 3258ef838a81SUwe Kleine-König rs485conf->delay_rts_after_send = 0; 3259ef838a81SUwe Kleine-König } 3260ef838a81SUwe Kleine-König 3261ef838a81SUwe Kleine-König /* 3262f1e5b618SLukas Wunner * Clear full-duplex and enabled flags, set RTS polarity to active high 3263f1e5b618SLukas Wunner * to get to a defined state with the following properties: 3264ef838a81SUwe Kleine-König */ 3265f1e5b618SLukas Wunner rs485conf->flags &= ~(SER_RS485_RX_DURING_TX | SER_RS485_ENABLED | 3266f1e5b618SLukas Wunner SER_RS485_RTS_AFTER_SEND); 3267f1e5b618SLukas Wunner rs485conf->flags |= SER_RS485_RTS_ON_SEND; 3268ef838a81SUwe Kleine-König 3269743f93f8SLukas Wunner if (device_property_read_bool(dev, "rs485-rx-during-tx")) 3270ef838a81SUwe Kleine-König rs485conf->flags |= SER_RS485_RX_DURING_TX; 3271ef838a81SUwe Kleine-König 3272743f93f8SLukas Wunner if (device_property_read_bool(dev, "linux,rs485-enabled-at-boot-time")) 3273ef838a81SUwe Kleine-König rs485conf->flags |= SER_RS485_ENABLED; 3274f1e5b618SLukas Wunner 3275f1e5b618SLukas Wunner if (device_property_read_bool(dev, "rs485-rts-active-low")) { 3276f1e5b618SLukas Wunner rs485conf->flags &= ~SER_RS485_RTS_ON_SEND; 3277f1e5b618SLukas Wunner rs485conf->flags |= SER_RS485_RTS_AFTER_SEND; 3278f1e5b618SLukas Wunner } 3279ef838a81SUwe Kleine-König } 3280743f93f8SLukas Wunner EXPORT_SYMBOL_GPL(uart_get_rs485_mode); 3281ef838a81SUwe Kleine-König 3282ab4382d2SGreg Kroah-Hartman MODULE_DESCRIPTION("Serial driver core"); 3283ab4382d2SGreg Kroah-Hartman MODULE_LICENSE("GPL"); 3284