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 44ab4382d2SGreg Kroah-Hartman static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, 45ab4382d2SGreg Kroah-Hartman struct ktermios *old_termios); 461f33a51dSJiri Slaby static void uart_wait_until_sent(struct tty_struct *tty, int timeout); 476f538fe3SLinus Walleij static void uart_change_pm(struct uart_state *state, 486f538fe3SLinus Walleij enum uart_pm_state pm_state); 49ab4382d2SGreg Kroah-Hartman 50b922e19dSJiri Slaby static void uart_port_shutdown(struct tty_port *port); 51b922e19dSJiri Slaby 52299245a1SPeter Hurley static int uart_dcd_enabled(struct uart_port *uport) 53299245a1SPeter Hurley { 54d4260b51SPeter Hurley return !!(uport->status & UPSTAT_DCD_ENABLE); 55299245a1SPeter Hurley } 56299245a1SPeter Hurley 579ed19428SPeter Hurley static inline struct uart_port *uart_port_ref(struct uart_state *state) 589ed19428SPeter Hurley { 599ed19428SPeter Hurley if (atomic_add_unless(&state->refcount, 1, 0)) 609ed19428SPeter Hurley return state->uart_port; 619ed19428SPeter Hurley return NULL; 629ed19428SPeter Hurley } 639ed19428SPeter Hurley 649ed19428SPeter Hurley static inline void uart_port_deref(struct uart_port *uport) 659ed19428SPeter Hurley { 66ef510beaSAndy Shevchenko if (atomic_dec_and_test(&uport->state->refcount)) 679ed19428SPeter Hurley wake_up(&uport->state->remove_wait); 689ed19428SPeter Hurley } 699ed19428SPeter Hurley 709ed19428SPeter Hurley #define uart_port_lock(state, flags) \ 719ed19428SPeter Hurley ({ \ 729ed19428SPeter Hurley struct uart_port *__uport = uart_port_ref(state); \ 739ed19428SPeter Hurley if (__uport) \ 749ed19428SPeter Hurley spin_lock_irqsave(&__uport->lock, flags); \ 759ed19428SPeter Hurley __uport; \ 769ed19428SPeter Hurley }) 779ed19428SPeter Hurley 789ed19428SPeter Hurley #define uart_port_unlock(uport, flags) \ 799ed19428SPeter Hurley ({ \ 809ed19428SPeter Hurley struct uart_port *__uport = uport; \ 81ef510beaSAndy Shevchenko if (__uport) { \ 829ed19428SPeter Hurley spin_unlock_irqrestore(&__uport->lock, flags); \ 839ed19428SPeter Hurley uart_port_deref(__uport); \ 84ef510beaSAndy Shevchenko } \ 859ed19428SPeter Hurley }) 869ed19428SPeter Hurley 874047b371SPeter Hurley static inline struct uart_port *uart_port_check(struct uart_state *state) 884047b371SPeter Hurley { 897da4b8b7SPeter Hurley lockdep_assert_held(&state->port.mutex); 904047b371SPeter Hurley return state->uart_port; 914047b371SPeter Hurley } 924047b371SPeter Hurley 93ab4382d2SGreg Kroah-Hartman /* 94ab4382d2SGreg Kroah-Hartman * This routine is used by the interrupt handler to schedule processing in 95ab4382d2SGreg Kroah-Hartman * the software interrupt portion of the driver. 96ab4382d2SGreg Kroah-Hartman */ 97ab4382d2SGreg Kroah-Hartman void uart_write_wakeup(struct uart_port *port) 98ab4382d2SGreg Kroah-Hartman { 99ab4382d2SGreg Kroah-Hartman struct uart_state *state = port->state; 100ab4382d2SGreg Kroah-Hartman /* 101ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 102ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 103ab4382d2SGreg Kroah-Hartman */ 104ab4382d2SGreg Kroah-Hartman BUG_ON(!state); 105d0f4bce2SRob Herring tty_port_tty_wakeup(&state->port); 106ab4382d2SGreg Kroah-Hartman } 107ab4382d2SGreg Kroah-Hartman 108ab4382d2SGreg Kroah-Hartman static void uart_stop(struct tty_struct *tty) 109ab4382d2SGreg Kroah-Hartman { 110ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1119ed19428SPeter Hurley struct uart_port *port; 112ab4382d2SGreg Kroah-Hartman unsigned long flags; 113ab4382d2SGreg Kroah-Hartman 1149ed19428SPeter Hurley port = uart_port_lock(state, flags); 1159ed19428SPeter Hurley if (port) 116ab4382d2SGreg Kroah-Hartman port->ops->stop_tx(port); 1179ed19428SPeter Hurley uart_port_unlock(port, flags); 118ab4382d2SGreg Kroah-Hartman } 119ab4382d2SGreg Kroah-Hartman 120ab4382d2SGreg Kroah-Hartman static void __uart_start(struct tty_struct *tty) 121ab4382d2SGreg Kroah-Hartman { 122ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 123ab4382d2SGreg Kroah-Hartman struct uart_port *port = state->uart_port; 124ab4382d2SGreg Kroah-Hartman 1259ed19428SPeter Hurley if (port && !uart_tx_stopped(port)) 126ab4382d2SGreg Kroah-Hartman port->ops->start_tx(port); 127ab4382d2SGreg Kroah-Hartman } 128ab4382d2SGreg Kroah-Hartman 129ab4382d2SGreg Kroah-Hartman static void uart_start(struct tty_struct *tty) 130ab4382d2SGreg Kroah-Hartman { 131ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1329ed19428SPeter Hurley struct uart_port *port; 133ab4382d2SGreg Kroah-Hartman unsigned long flags; 134ab4382d2SGreg Kroah-Hartman 1359ed19428SPeter Hurley port = uart_port_lock(state, flags); 136ab4382d2SGreg Kroah-Hartman __uart_start(tty); 1379ed19428SPeter Hurley uart_port_unlock(port, flags); 138ab4382d2SGreg Kroah-Hartman } 139ab4382d2SGreg Kroah-Hartman 140f4581cabSDenys Vlasenko static void 141ab4382d2SGreg Kroah-Hartman uart_update_mctrl(struct uart_port *port, unsigned int set, unsigned int clear) 142ab4382d2SGreg Kroah-Hartman { 143ab4382d2SGreg Kroah-Hartman unsigned long flags; 144ab4382d2SGreg Kroah-Hartman unsigned int old; 145ab4382d2SGreg Kroah-Hartman 146ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 147ab4382d2SGreg Kroah-Hartman old = port->mctrl; 148ab4382d2SGreg Kroah-Hartman port->mctrl = (old & ~clear) | set; 149ab4382d2SGreg Kroah-Hartman if (old != port->mctrl) 150ab4382d2SGreg Kroah-Hartman port->ops->set_mctrl(port, port->mctrl); 151ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 152ab4382d2SGreg Kroah-Hartman } 153ab4382d2SGreg Kroah-Hartman 154ab4382d2SGreg Kroah-Hartman #define uart_set_mctrl(port, set) uart_update_mctrl(port, set, 0) 155ab4382d2SGreg Kroah-Hartman #define uart_clear_mctrl(port, clear) uart_update_mctrl(port, 0, clear) 156ab4382d2SGreg Kroah-Hartman 157a6845e1eSRafael Gago static void uart_port_dtr_rts(struct uart_port *uport, int raise) 158a6845e1eSRafael Gago { 159a6845e1eSRafael Gago int rs485_on = uport->rs485_config && 160a6845e1eSRafael Gago (uport->rs485.flags & SER_RS485_ENABLED); 161a6845e1eSRafael Gago int RTS_after_send = !!(uport->rs485.flags & SER_RS485_RTS_AFTER_SEND); 162a6845e1eSRafael Gago 163a6845e1eSRafael Gago if (raise) { 164a6845e1eSRafael Gago if (rs485_on && !RTS_after_send) { 165a6845e1eSRafael Gago uart_set_mctrl(uport, TIOCM_DTR); 166a6845e1eSRafael Gago uart_clear_mctrl(uport, TIOCM_RTS); 167a6845e1eSRafael Gago } else { 168a6845e1eSRafael Gago uart_set_mctrl(uport, TIOCM_DTR | TIOCM_RTS); 169a6845e1eSRafael Gago } 170a6845e1eSRafael Gago } else { 171a6845e1eSRafael Gago unsigned int clear = TIOCM_DTR; 172a6845e1eSRafael Gago 173a6845e1eSRafael Gago clear |= (!rs485_on || !RTS_after_send) ? TIOCM_RTS : 0; 174a6845e1eSRafael Gago uart_clear_mctrl(uport, clear); 175a6845e1eSRafael Gago } 176a6845e1eSRafael Gago } 177a6845e1eSRafael Gago 178ab4382d2SGreg Kroah-Hartman /* 179ab4382d2SGreg Kroah-Hartman * Startup the port. This will be called once per open. All calls 180ab4382d2SGreg Kroah-Hartman * will be serialised by the per-port mutex. 181ab4382d2SGreg Kroah-Hartman */ 182c0d92be6SJiri Slaby static int uart_port_startup(struct tty_struct *tty, struct uart_state *state, 183c0d92be6SJiri Slaby int init_hw) 184ab4382d2SGreg Kroah-Hartman { 1854047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 186ab4382d2SGreg Kroah-Hartman unsigned long page; 187a5ba1d95STycho Andersen unsigned long flags = 0; 188ab4382d2SGreg Kroah-Hartman int retval = 0; 189ab4382d2SGreg Kroah-Hartman 190ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) 191c0d92be6SJiri Slaby return 1; 192ab4382d2SGreg Kroah-Hartman 193ab4382d2SGreg Kroah-Hartman /* 1947deb39edSThomas Pfaff * Make sure the device is in D0 state. 1957deb39edSThomas Pfaff */ 1967deb39edSThomas Pfaff uart_change_pm(state, UART_PM_STATE_ON); 1977deb39edSThomas Pfaff 1987deb39edSThomas Pfaff /* 199ab4382d2SGreg Kroah-Hartman * Initialise and allocate the transmit and temporary 200ab4382d2SGreg Kroah-Hartman * buffer. 201ab4382d2SGreg Kroah-Hartman */ 202ab4382d2SGreg Kroah-Hartman page = get_zeroed_page(GFP_KERNEL); 203ab4382d2SGreg Kroah-Hartman if (!page) 204ab4382d2SGreg Kroah-Hartman return -ENOMEM; 205ab4382d2SGreg Kroah-Hartman 206a5ba1d95STycho Andersen uart_port_lock(state, flags); 207a5ba1d95STycho Andersen if (!state->xmit.buf) { 208ab4382d2SGreg Kroah-Hartman state->xmit.buf = (unsigned char *) page; 209ab4382d2SGreg Kroah-Hartman uart_circ_clear(&state->xmit); 210d7240214SSergey Senozhatsky uart_port_unlock(uport, flags); 211a5ba1d95STycho Andersen } else { 212d7240214SSergey Senozhatsky uart_port_unlock(uport, flags); 213d7240214SSergey Senozhatsky /* 214d7240214SSergey Senozhatsky * Do not free() the page under the port lock, see 215d7240214SSergey Senozhatsky * uart_shutdown(). 216d7240214SSergey Senozhatsky */ 217a5ba1d95STycho Andersen free_page(page); 218ab4382d2SGreg Kroah-Hartman } 219ab4382d2SGreg Kroah-Hartman 220ab4382d2SGreg Kroah-Hartman retval = uport->ops->startup(uport); 221ab4382d2SGreg Kroah-Hartman if (retval == 0) { 222c7d7abffSJiri Slaby if (uart_console(uport) && uport->cons->cflag) { 223adc8d746SAlan Cox tty->termios.c_cflag = uport->cons->cflag; 224c7d7abffSJiri Slaby uport->cons->cflag = 0; 225c7d7abffSJiri Slaby } 226ab4382d2SGreg Kroah-Hartman /* 227ab4382d2SGreg Kroah-Hartman * Initialise the hardware port settings. 228ab4382d2SGreg Kroah-Hartman */ 229ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 230ab4382d2SGreg Kroah-Hartman 231ab4382d2SGreg Kroah-Hartman /* 232ab4382d2SGreg Kroah-Hartman * Setup the RTS and DTR signals once the 233ab4382d2SGreg Kroah-Hartman * port is open and ready to respond. 234ab4382d2SGreg Kroah-Hartman */ 2359db276f8SPeter Hurley if (init_hw && C_BAUD(tty)) 236a6845e1eSRafael Gago uart_port_dtr_rts(uport, 1); 237ab4382d2SGreg Kroah-Hartman } 238ab4382d2SGreg Kroah-Hartman 2390055197eSJiri Slaby /* 2400055197eSJiri Slaby * This is to allow setserial on this port. People may want to set 2410055197eSJiri Slaby * port/irq/type and then reconfigure the port properly if it failed 2420055197eSJiri Slaby * now. 2430055197eSJiri Slaby */ 244ab4382d2SGreg Kroah-Hartman if (retval && capable(CAP_SYS_ADMIN)) 245c0d92be6SJiri Slaby return 1; 246c0d92be6SJiri Slaby 247c0d92be6SJiri Slaby return retval; 248c0d92be6SJiri Slaby } 249c0d92be6SJiri Slaby 250c0d92be6SJiri Slaby static int uart_startup(struct tty_struct *tty, struct uart_state *state, 251c0d92be6SJiri Slaby int init_hw) 252c0d92be6SJiri Slaby { 253c0d92be6SJiri Slaby struct tty_port *port = &state->port; 254c0d92be6SJiri Slaby int retval; 255c0d92be6SJiri Slaby 256d41861caSPeter Hurley if (tty_port_initialized(port)) 257c0d92be6SJiri Slaby return 0; 258c0d92be6SJiri Slaby 259c0d92be6SJiri Slaby retval = uart_port_startup(tty, state, init_hw); 260b3b57646SRob Herring if (retval) 261b3b57646SRob Herring set_bit(TTY_IO_ERROR, &tty->flags); 262ab4382d2SGreg Kroah-Hartman 263ab4382d2SGreg Kroah-Hartman return retval; 264ab4382d2SGreg Kroah-Hartman } 265ab4382d2SGreg Kroah-Hartman 266ab4382d2SGreg Kroah-Hartman /* 267ab4382d2SGreg Kroah-Hartman * This routine will shutdown a serial port; interrupts are disabled, and 268ab4382d2SGreg Kroah-Hartman * DTR is dropped if the hangup on close termio flag is on. Calls to 269ab4382d2SGreg Kroah-Hartman * uart_shutdown are serialised by the per-port semaphore. 270af224ca2SPeter Hurley * 271af224ca2SPeter Hurley * uport == NULL if uart_port has already been removed 272ab4382d2SGreg Kroah-Hartman */ 273ab4382d2SGreg Kroah-Hartman static void uart_shutdown(struct tty_struct *tty, struct uart_state *state) 274ab4382d2SGreg Kroah-Hartman { 2754047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 276ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 277a5ba1d95STycho Andersen unsigned long flags = 0; 278d7240214SSergey Senozhatsky char *xmit_buf = NULL; 279ab4382d2SGreg Kroah-Hartman 280ab4382d2SGreg Kroah-Hartman /* 281ab4382d2SGreg Kroah-Hartman * Set the TTY IO error marker 282ab4382d2SGreg Kroah-Hartman */ 283ab4382d2SGreg Kroah-Hartman if (tty) 284ab4382d2SGreg Kroah-Hartman set_bit(TTY_IO_ERROR, &tty->flags); 285ab4382d2SGreg Kroah-Hartman 286d41861caSPeter Hurley if (tty_port_initialized(port)) { 287d41861caSPeter Hurley tty_port_set_initialized(port, 0); 288d41861caSPeter Hurley 289ab4382d2SGreg Kroah-Hartman /* 290ab4382d2SGreg Kroah-Hartman * Turn off DTR and RTS early. 291ab4382d2SGreg Kroah-Hartman */ 292af224ca2SPeter Hurley if (uport && uart_console(uport) && tty) 293ae84db96SPeter Hurley uport->cons->cflag = tty->termios.c_cflag; 294ae84db96SPeter Hurley 2959db276f8SPeter Hurley if (!tty || C_HUPCL(tty)) 296a6845e1eSRafael Gago uart_port_dtr_rts(uport, 0); 297ab4382d2SGreg Kroah-Hartman 298b922e19dSJiri Slaby uart_port_shutdown(port); 299ab4382d2SGreg Kroah-Hartman } 300ab4382d2SGreg Kroah-Hartman 301ab4382d2SGreg Kroah-Hartman /* 302d208a3bfSDoug Anderson * It's possible for shutdown to be called after suspend if we get 303d208a3bfSDoug Anderson * a DCD drop (hangup) at just the right time. Clear suspended bit so 304d208a3bfSDoug Anderson * we don't try to resume a port that has been shutdown. 305ab4382d2SGreg Kroah-Hartman */ 30680f02d54SPeter Hurley tty_port_set_suspended(port, 0); 307ab4382d2SGreg Kroah-Hartman 308ab4382d2SGreg Kroah-Hartman /* 309d7240214SSergey Senozhatsky * Do not free() the transmit buffer page under the port lock since 310d7240214SSergey Senozhatsky * this can create various circular locking scenarios. For instance, 311d7240214SSergey Senozhatsky * console driver may need to allocate/free a debug object, which 312d7240214SSergey Senozhatsky * can endup in printk() recursion. 313ab4382d2SGreg Kroah-Hartman */ 314a5ba1d95STycho Andersen uart_port_lock(state, flags); 315d7240214SSergey Senozhatsky xmit_buf = state->xmit.buf; 316ab4382d2SGreg Kroah-Hartman state->xmit.buf = NULL; 317a5ba1d95STycho Andersen uart_port_unlock(uport, flags); 318d7240214SSergey Senozhatsky 319d7240214SSergey Senozhatsky if (xmit_buf) 320d7240214SSergey Senozhatsky free_page((unsigned long)xmit_buf); 321ab4382d2SGreg Kroah-Hartman } 322ab4382d2SGreg Kroah-Hartman 323ab4382d2SGreg Kroah-Hartman /** 324ab4382d2SGreg Kroah-Hartman * uart_update_timeout - update per-port FIFO timeout. 325ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port 326ab4382d2SGreg Kroah-Hartman * @cflag: termios cflag value 327ab4382d2SGreg Kroah-Hartman * @baud: speed of the port 328ab4382d2SGreg Kroah-Hartman * 329ab4382d2SGreg Kroah-Hartman * Set the port FIFO timeout value. The @cflag value should 330ab4382d2SGreg Kroah-Hartman * reflect the actual hardware settings. 331ab4382d2SGreg Kroah-Hartman */ 332ab4382d2SGreg Kroah-Hartman void 333ab4382d2SGreg Kroah-Hartman uart_update_timeout(struct uart_port *port, unsigned int cflag, 334ab4382d2SGreg Kroah-Hartman unsigned int baud) 335ab4382d2SGreg Kroah-Hartman { 336ab4382d2SGreg Kroah-Hartman unsigned int bits; 337ab4382d2SGreg Kroah-Hartman 338ab4382d2SGreg Kroah-Hartman /* byte size and parity */ 339ab4382d2SGreg Kroah-Hartman switch (cflag & CSIZE) { 340ab4382d2SGreg Kroah-Hartman case CS5: 341ab4382d2SGreg Kroah-Hartman bits = 7; 342ab4382d2SGreg Kroah-Hartman break; 343ab4382d2SGreg Kroah-Hartman case CS6: 344ab4382d2SGreg Kroah-Hartman bits = 8; 345ab4382d2SGreg Kroah-Hartman break; 346ab4382d2SGreg Kroah-Hartman case CS7: 347ab4382d2SGreg Kroah-Hartman bits = 9; 348ab4382d2SGreg Kroah-Hartman break; 349ab4382d2SGreg Kroah-Hartman default: 350ab4382d2SGreg Kroah-Hartman bits = 10; 351ab4382d2SGreg Kroah-Hartman break; /* CS8 */ 352ab4382d2SGreg Kroah-Hartman } 353ab4382d2SGreg Kroah-Hartman 354ab4382d2SGreg Kroah-Hartman if (cflag & CSTOPB) 355ab4382d2SGreg Kroah-Hartman bits++; 356ab4382d2SGreg Kroah-Hartman if (cflag & PARENB) 357ab4382d2SGreg Kroah-Hartman bits++; 358ab4382d2SGreg Kroah-Hartman 359ab4382d2SGreg Kroah-Hartman /* 360ab4382d2SGreg Kroah-Hartman * The total number of bits to be transmitted in the fifo. 361ab4382d2SGreg Kroah-Hartman */ 362ab4382d2SGreg Kroah-Hartman bits = bits * port->fifosize; 363ab4382d2SGreg Kroah-Hartman 364ab4382d2SGreg Kroah-Hartman /* 365ab4382d2SGreg Kroah-Hartman * Figure the timeout to send the above number of bits. 366ab4382d2SGreg Kroah-Hartman * Add .02 seconds of slop 367ab4382d2SGreg Kroah-Hartman */ 368ab4382d2SGreg Kroah-Hartman port->timeout = (HZ * bits) / baud + HZ/50; 369ab4382d2SGreg Kroah-Hartman } 370ab4382d2SGreg Kroah-Hartman 371ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_update_timeout); 372ab4382d2SGreg Kroah-Hartman 373ab4382d2SGreg Kroah-Hartman /** 374ab4382d2SGreg Kroah-Hartman * uart_get_baud_rate - return baud rate for a particular port 375ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port in question. 376ab4382d2SGreg Kroah-Hartman * @termios: desired termios settings. 377ab4382d2SGreg Kroah-Hartman * @old: old termios (or NULL) 378ab4382d2SGreg Kroah-Hartman * @min: minimum acceptable baud rate 379ab4382d2SGreg Kroah-Hartman * @max: maximum acceptable baud rate 380ab4382d2SGreg Kroah-Hartman * 381ab4382d2SGreg Kroah-Hartman * Decode the termios structure into a numeric baud rate, 382ab4382d2SGreg Kroah-Hartman * taking account of the magic 38400 baud rate (with spd_* 383ab4382d2SGreg Kroah-Hartman * flags), and mapping the %B0 rate to 9600 baud. 384ab4382d2SGreg Kroah-Hartman * 385ab4382d2SGreg Kroah-Hartman * If the new baud rate is invalid, try the old termios setting. 386ab4382d2SGreg Kroah-Hartman * If it's still invalid, we try 9600 baud. 387ab4382d2SGreg Kroah-Hartman * 388ab4382d2SGreg Kroah-Hartman * Update the @termios structure to reflect the baud rate 389ab4382d2SGreg Kroah-Hartman * we're actually going to be using. Don't do this for the case 390ab4382d2SGreg Kroah-Hartman * where B0 is requested ("hang up"). 391ab4382d2SGreg Kroah-Hartman */ 392ab4382d2SGreg Kroah-Hartman unsigned int 393ab4382d2SGreg Kroah-Hartman uart_get_baud_rate(struct uart_port *port, struct ktermios *termios, 394ab4382d2SGreg Kroah-Hartman struct ktermios *old, unsigned int min, unsigned int max) 395ab4382d2SGreg Kroah-Hartman { 396f10a2233SJoakim Nordell unsigned int try; 397f10a2233SJoakim Nordell unsigned int baud; 398f10a2233SJoakim Nordell unsigned int altbaud; 399ab4382d2SGreg Kroah-Hartman int hung_up = 0; 400ab4382d2SGreg Kroah-Hartman upf_t flags = port->flags & UPF_SPD_MASK; 401ab4382d2SGreg Kroah-Hartman 402f10a2233SJoakim Nordell switch (flags) { 403f10a2233SJoakim Nordell case UPF_SPD_HI: 404ab4382d2SGreg Kroah-Hartman altbaud = 57600; 405f10a2233SJoakim Nordell break; 406f10a2233SJoakim Nordell case UPF_SPD_VHI: 407ab4382d2SGreg Kroah-Hartman altbaud = 115200; 408f10a2233SJoakim Nordell break; 409f10a2233SJoakim Nordell case UPF_SPD_SHI: 410ab4382d2SGreg Kroah-Hartman altbaud = 230400; 411f10a2233SJoakim Nordell break; 412f10a2233SJoakim Nordell case UPF_SPD_WARP: 413ab4382d2SGreg Kroah-Hartman altbaud = 460800; 414f10a2233SJoakim Nordell break; 415f10a2233SJoakim Nordell default: 416f10a2233SJoakim Nordell altbaud = 38400; 417f10a2233SJoakim Nordell break; 418f10a2233SJoakim Nordell } 419ab4382d2SGreg Kroah-Hartman 420ab4382d2SGreg Kroah-Hartman for (try = 0; try < 2; try++) { 421ab4382d2SGreg Kroah-Hartman baud = tty_termios_baud_rate(termios); 422ab4382d2SGreg Kroah-Hartman 423ab4382d2SGreg Kroah-Hartman /* 424ab4382d2SGreg Kroah-Hartman * The spd_hi, spd_vhi, spd_shi, spd_warp kludge... 425ab4382d2SGreg Kroah-Hartman * Die! Die! Die! 426ab4382d2SGreg Kroah-Hartman */ 427547039ecSPeter Hurley if (try == 0 && baud == 38400) 428ab4382d2SGreg Kroah-Hartman baud = altbaud; 429ab4382d2SGreg Kroah-Hartman 430ab4382d2SGreg Kroah-Hartman /* 431ab4382d2SGreg Kroah-Hartman * Special case: B0 rate. 432ab4382d2SGreg Kroah-Hartman */ 433ab4382d2SGreg Kroah-Hartman if (baud == 0) { 434ab4382d2SGreg Kroah-Hartman hung_up = 1; 435ab4382d2SGreg Kroah-Hartman baud = 9600; 436ab4382d2SGreg Kroah-Hartman } 437ab4382d2SGreg Kroah-Hartman 438ab4382d2SGreg Kroah-Hartman if (baud >= min && baud <= max) 439ab4382d2SGreg Kroah-Hartman return baud; 440ab4382d2SGreg Kroah-Hartman 441ab4382d2SGreg Kroah-Hartman /* 442ab4382d2SGreg Kroah-Hartman * Oops, the quotient was zero. Try again with 443ab4382d2SGreg Kroah-Hartman * the old baud rate if possible. 444ab4382d2SGreg Kroah-Hartman */ 445ab4382d2SGreg Kroah-Hartman termios->c_cflag &= ~CBAUD; 446ab4382d2SGreg Kroah-Hartman if (old) { 447ab4382d2SGreg Kroah-Hartman baud = tty_termios_baud_rate(old); 448ab4382d2SGreg Kroah-Hartman if (!hung_up) 449ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 450ab4382d2SGreg Kroah-Hartman baud, baud); 451ab4382d2SGreg Kroah-Hartman old = NULL; 452ab4382d2SGreg Kroah-Hartman continue; 453ab4382d2SGreg Kroah-Hartman } 454ab4382d2SGreg Kroah-Hartman 455ab4382d2SGreg Kroah-Hartman /* 456ab4382d2SGreg Kroah-Hartman * As a last resort, if the range cannot be met then clip to 457ab4382d2SGreg Kroah-Hartman * the nearest chip supported rate. 458ab4382d2SGreg Kroah-Hartman */ 459ab4382d2SGreg Kroah-Hartman if (!hung_up) { 460ab4382d2SGreg Kroah-Hartman if (baud <= min) 461ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 462ab4382d2SGreg Kroah-Hartman min + 1, min + 1); 463ab4382d2SGreg Kroah-Hartman else 464ab4382d2SGreg Kroah-Hartman tty_termios_encode_baud_rate(termios, 465ab4382d2SGreg Kroah-Hartman max - 1, max - 1); 466ab4382d2SGreg Kroah-Hartman } 467ab4382d2SGreg Kroah-Hartman } 468ab4382d2SGreg Kroah-Hartman /* Should never happen */ 469ab4382d2SGreg Kroah-Hartman WARN_ON(1); 470ab4382d2SGreg Kroah-Hartman return 0; 471ab4382d2SGreg Kroah-Hartman } 472ab4382d2SGreg Kroah-Hartman 473ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_get_baud_rate); 474ab4382d2SGreg Kroah-Hartman 475ab4382d2SGreg Kroah-Hartman /** 476ab4382d2SGreg Kroah-Hartman * uart_get_divisor - return uart clock divisor 477ab4382d2SGreg Kroah-Hartman * @port: uart_port structure describing the port. 478ab4382d2SGreg Kroah-Hartman * @baud: desired baud rate 479ab4382d2SGreg Kroah-Hartman * 480ab4382d2SGreg Kroah-Hartman * Calculate the uart clock divisor for the port. 481ab4382d2SGreg Kroah-Hartman */ 482ab4382d2SGreg Kroah-Hartman unsigned int 483ab4382d2SGreg Kroah-Hartman uart_get_divisor(struct uart_port *port, unsigned int baud) 484ab4382d2SGreg Kroah-Hartman { 485ab4382d2SGreg Kroah-Hartman unsigned int quot; 486ab4382d2SGreg Kroah-Hartman 487ab4382d2SGreg Kroah-Hartman /* 488ab4382d2SGreg Kroah-Hartman * Old custom speed handling. 489ab4382d2SGreg Kroah-Hartman */ 490ab4382d2SGreg Kroah-Hartman if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST) 491ab4382d2SGreg Kroah-Hartman quot = port->custom_divisor; 492ab4382d2SGreg Kroah-Hartman else 49397d24634SUwe Kleine-König quot = DIV_ROUND_CLOSEST(port->uartclk, 16 * baud); 494ab4382d2SGreg Kroah-Hartman 495ab4382d2SGreg Kroah-Hartman return quot; 496ab4382d2SGreg Kroah-Hartman } 497ab4382d2SGreg Kroah-Hartman 498ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_get_divisor); 499ab4382d2SGreg Kroah-Hartman 5007c8ab967SPeter Hurley /* Caller holds port mutex */ 501ab4382d2SGreg Kroah-Hartman static void uart_change_speed(struct tty_struct *tty, struct uart_state *state, 502ab4382d2SGreg Kroah-Hartman struct ktermios *old_termios) 503ab4382d2SGreg Kroah-Hartman { 5044047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 505ab4382d2SGreg Kroah-Hartman struct ktermios *termios; 506391f93f2SPeter Hurley int hw_stopped; 507ab4382d2SGreg Kroah-Hartman 508ab4382d2SGreg Kroah-Hartman /* 509ab4382d2SGreg Kroah-Hartman * If we have no tty, termios, or the port does not exist, 510ab4382d2SGreg Kroah-Hartman * then we can't set the parameters for this port. 511ab4382d2SGreg Kroah-Hartman */ 512adc8d746SAlan Cox if (!tty || uport->type == PORT_UNKNOWN) 513ab4382d2SGreg Kroah-Hartman return; 514ab4382d2SGreg Kroah-Hartman 515adc8d746SAlan Cox termios = &tty->termios; 516c18b55fdSPeter Hurley uport->ops->set_termios(uport, termios, old_termios); 517ab4382d2SGreg Kroah-Hartman 518ab4382d2SGreg Kroah-Hartman /* 519299245a1SPeter Hurley * Set modem status enables based on termios cflag 520ab4382d2SGreg Kroah-Hartman */ 521299245a1SPeter Hurley spin_lock_irq(&uport->lock); 522ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CRTSCTS) 523299245a1SPeter Hurley uport->status |= UPSTAT_CTS_ENABLE; 524ab4382d2SGreg Kroah-Hartman else 525299245a1SPeter Hurley uport->status &= ~UPSTAT_CTS_ENABLE; 526ab4382d2SGreg Kroah-Hartman 527ab4382d2SGreg Kroah-Hartman if (termios->c_cflag & CLOCAL) 528299245a1SPeter Hurley uport->status &= ~UPSTAT_DCD_ENABLE; 529ab4382d2SGreg Kroah-Hartman else 530299245a1SPeter Hurley uport->status |= UPSTAT_DCD_ENABLE; 531391f93f2SPeter Hurley 532391f93f2SPeter Hurley /* reset sw-assisted CTS flow control based on (possibly) new mode */ 533391f93f2SPeter Hurley hw_stopped = uport->hw_stopped; 534391f93f2SPeter Hurley uport->hw_stopped = uart_softcts_mode(uport) && 535391f93f2SPeter Hurley !(uport->ops->get_mctrl(uport) & TIOCM_CTS); 536391f93f2SPeter Hurley if (uport->hw_stopped) { 537391f93f2SPeter Hurley if (!hw_stopped) 538391f93f2SPeter Hurley uport->ops->stop_tx(uport); 539391f93f2SPeter Hurley } else { 540391f93f2SPeter Hurley if (hw_stopped) 541391f93f2SPeter Hurley __uart_start(tty); 542391f93f2SPeter Hurley } 543299245a1SPeter Hurley spin_unlock_irq(&uport->lock); 544ab4382d2SGreg Kroah-Hartman } 545ab4382d2SGreg Kroah-Hartman 546f5291eccSPeter Hurley static int uart_put_char(struct tty_struct *tty, unsigned char c) 547ab4382d2SGreg Kroah-Hartman { 548f5291eccSPeter Hurley struct uart_state *state = tty->driver_data; 5499ed19428SPeter Hurley struct uart_port *port; 550f5291eccSPeter Hurley struct circ_buf *circ; 551ab4382d2SGreg Kroah-Hartman unsigned long flags; 552ab4382d2SGreg Kroah-Hartman int ret = 0; 553ab4382d2SGreg Kroah-Hartman 554f5291eccSPeter Hurley circ = &state->xmit; 5559ed19428SPeter Hurley port = uart_port_lock(state, flags); 556aff9cf59SSamir Virmani if (!circ->buf) { 557aff9cf59SSamir Virmani uart_port_unlock(port, flags); 558aff9cf59SSamir Virmani return 0; 559aff9cf59SSamir Virmani } 560aff9cf59SSamir Virmani 5619ed19428SPeter Hurley if (port && uart_circ_chars_free(circ) != 0) { 562ab4382d2SGreg Kroah-Hartman circ->buf[circ->head] = c; 563ab4382d2SGreg Kroah-Hartman circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1); 564ab4382d2SGreg Kroah-Hartman ret = 1; 565ab4382d2SGreg Kroah-Hartman } 5669ed19428SPeter Hurley uart_port_unlock(port, flags); 567ab4382d2SGreg Kroah-Hartman return ret; 568ab4382d2SGreg Kroah-Hartman } 569ab4382d2SGreg Kroah-Hartman 570ab4382d2SGreg Kroah-Hartman static void uart_flush_chars(struct tty_struct *tty) 571ab4382d2SGreg Kroah-Hartman { 572ab4382d2SGreg Kroah-Hartman uart_start(tty); 573ab4382d2SGreg Kroah-Hartman } 574ab4382d2SGreg Kroah-Hartman 575ab4382d2SGreg Kroah-Hartman static int uart_write(struct tty_struct *tty, 576ab4382d2SGreg Kroah-Hartman const unsigned char *buf, int count) 577ab4382d2SGreg Kroah-Hartman { 578ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 579ab4382d2SGreg Kroah-Hartman struct uart_port *port; 580ab4382d2SGreg Kroah-Hartman struct circ_buf *circ; 581ab4382d2SGreg Kroah-Hartman unsigned long flags; 582ab4382d2SGreg Kroah-Hartman int c, ret = 0; 583ab4382d2SGreg Kroah-Hartman 584ab4382d2SGreg Kroah-Hartman /* 585ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 586ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 587ab4382d2SGreg Kroah-Hartman */ 588ab4382d2SGreg Kroah-Hartman if (!state) { 589ab4382d2SGreg Kroah-Hartman WARN_ON(1); 590ab4382d2SGreg Kroah-Hartman return -EL3HLT; 591ab4382d2SGreg Kroah-Hartman } 592ab4382d2SGreg Kroah-Hartman 5939ed19428SPeter Hurley port = uart_port_lock(state, flags); 594aff9cf59SSamir Virmani circ = &state->xmit; 595aff9cf59SSamir Virmani if (!circ->buf) { 596aff9cf59SSamir Virmani uart_port_unlock(port, flags); 597aff9cf59SSamir Virmani return 0; 598aff9cf59SSamir Virmani } 599aff9cf59SSamir Virmani 6009ed19428SPeter Hurley while (port) { 601ab4382d2SGreg Kroah-Hartman c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE); 602ab4382d2SGreg Kroah-Hartman if (count < c) 603ab4382d2SGreg Kroah-Hartman c = count; 604ab4382d2SGreg Kroah-Hartman if (c <= 0) 605ab4382d2SGreg Kroah-Hartman break; 606ab4382d2SGreg Kroah-Hartman memcpy(circ->buf + circ->head, buf, c); 607ab4382d2SGreg Kroah-Hartman circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1); 608ab4382d2SGreg Kroah-Hartman buf += c; 609ab4382d2SGreg Kroah-Hartman count -= c; 610ab4382d2SGreg Kroah-Hartman ret += c; 611ab4382d2SGreg Kroah-Hartman } 61264dbee31SPeter Hurley 61364dbee31SPeter Hurley __uart_start(tty); 6149ed19428SPeter Hurley uart_port_unlock(port, flags); 615ab4382d2SGreg Kroah-Hartman return ret; 616ab4382d2SGreg Kroah-Hartman } 617ab4382d2SGreg Kroah-Hartman 618ab4382d2SGreg Kroah-Hartman static int uart_write_room(struct tty_struct *tty) 619ab4382d2SGreg Kroah-Hartman { 620ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 6219ed19428SPeter Hurley struct uart_port *port; 622ab4382d2SGreg Kroah-Hartman unsigned long flags; 623ab4382d2SGreg Kroah-Hartman int ret; 624ab4382d2SGreg Kroah-Hartman 6259ed19428SPeter Hurley port = uart_port_lock(state, flags); 626ab4382d2SGreg Kroah-Hartman ret = uart_circ_chars_free(&state->xmit); 6279ed19428SPeter Hurley uart_port_unlock(port, flags); 628ab4382d2SGreg Kroah-Hartman return ret; 629ab4382d2SGreg Kroah-Hartman } 630ab4382d2SGreg Kroah-Hartman 631ab4382d2SGreg Kroah-Hartman static int uart_chars_in_buffer(struct tty_struct *tty) 632ab4382d2SGreg Kroah-Hartman { 633ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 6349ed19428SPeter Hurley struct uart_port *port; 635ab4382d2SGreg Kroah-Hartman unsigned long flags; 636ab4382d2SGreg Kroah-Hartman int ret; 637ab4382d2SGreg Kroah-Hartman 6389ed19428SPeter Hurley port = uart_port_lock(state, flags); 639ab4382d2SGreg Kroah-Hartman ret = uart_circ_chars_pending(&state->xmit); 6409ed19428SPeter Hurley uart_port_unlock(port, flags); 641ab4382d2SGreg Kroah-Hartman return ret; 642ab4382d2SGreg Kroah-Hartman } 643ab4382d2SGreg Kroah-Hartman 644ab4382d2SGreg Kroah-Hartman static void uart_flush_buffer(struct tty_struct *tty) 645ab4382d2SGreg Kroah-Hartman { 646ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 647ab4382d2SGreg Kroah-Hartman struct uart_port *port; 648ab4382d2SGreg Kroah-Hartman unsigned long flags; 649ab4382d2SGreg Kroah-Hartman 650ab4382d2SGreg Kroah-Hartman /* 651ab4382d2SGreg Kroah-Hartman * This means you called this function _after_ the port was 652ab4382d2SGreg Kroah-Hartman * closed. No cookie for you. 653ab4382d2SGreg Kroah-Hartman */ 654ab4382d2SGreg Kroah-Hartman if (!state) { 655ab4382d2SGreg Kroah-Hartman WARN_ON(1); 656ab4382d2SGreg Kroah-Hartman return; 657ab4382d2SGreg Kroah-Hartman } 658ab4382d2SGreg Kroah-Hartman 659ab4382d2SGreg Kroah-Hartman pr_debug("uart_flush_buffer(%d) called\n", tty->index); 660ab4382d2SGreg Kroah-Hartman 6619ed19428SPeter Hurley port = uart_port_lock(state, flags); 6629ed19428SPeter Hurley if (!port) 6639ed19428SPeter Hurley return; 664ab4382d2SGreg Kroah-Hartman uart_circ_clear(&state->xmit); 665ab4382d2SGreg Kroah-Hartman if (port->ops->flush_buffer) 666ab4382d2SGreg Kroah-Hartman port->ops->flush_buffer(port); 6679ed19428SPeter Hurley uart_port_unlock(port, flags); 668d0f4bce2SRob Herring tty_port_tty_wakeup(&state->port); 669ab4382d2SGreg Kroah-Hartman } 670ab4382d2SGreg Kroah-Hartman 671ab4382d2SGreg Kroah-Hartman /* 672ab4382d2SGreg Kroah-Hartman * This function is used to send a high-priority XON/XOFF character to 673ab4382d2SGreg Kroah-Hartman * the device 674ab4382d2SGreg Kroah-Hartman */ 675ab4382d2SGreg Kroah-Hartman static void uart_send_xchar(struct tty_struct *tty, char ch) 676ab4382d2SGreg Kroah-Hartman { 677ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 6789ed19428SPeter Hurley struct uart_port *port; 679ab4382d2SGreg Kroah-Hartman unsigned long flags; 680ab4382d2SGreg Kroah-Hartman 6819ed19428SPeter Hurley port = uart_port_ref(state); 6829ed19428SPeter Hurley if (!port) 6839ed19428SPeter Hurley return; 6849ed19428SPeter Hurley 685ab4382d2SGreg Kroah-Hartman if (port->ops->send_xchar) 686ab4382d2SGreg Kroah-Hartman port->ops->send_xchar(port, ch); 687ab4382d2SGreg Kroah-Hartman else { 688ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 689c235ccc1SPeter Hurley port->x_char = ch; 690c235ccc1SPeter Hurley if (ch) 691ab4382d2SGreg Kroah-Hartman port->ops->start_tx(port); 692ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 693ab4382d2SGreg Kroah-Hartman } 6949ed19428SPeter Hurley uart_port_deref(port); 695ab4382d2SGreg Kroah-Hartman } 696ab4382d2SGreg Kroah-Hartman 697ab4382d2SGreg Kroah-Hartman static void uart_throttle(struct tty_struct *tty) 698ab4382d2SGreg Kroah-Hartman { 699ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 700c5f78b1fSJeremy Kerr upstat_t mask = UPSTAT_SYNC_FIFO; 7019ed19428SPeter Hurley struct uart_port *port; 702ab4382d2SGreg Kroah-Hartman 7039ed19428SPeter Hurley port = uart_port_ref(state); 7049ed19428SPeter Hurley if (!port) 7059ed19428SPeter Hurley return; 7069ed19428SPeter Hurley 707ab4382d2SGreg Kroah-Hartman if (I_IXOFF(tty)) 708391f93f2SPeter Hurley mask |= UPSTAT_AUTOXOFF; 7099db276f8SPeter Hurley if (C_CRTSCTS(tty)) 710391f93f2SPeter Hurley mask |= UPSTAT_AUTORTS; 7119aba8d5bSRussell King 712391f93f2SPeter Hurley if (port->status & mask) { 7139aba8d5bSRussell King port->ops->throttle(port); 714391f93f2SPeter Hurley mask &= ~port->status; 7159aba8d5bSRussell King } 7169aba8d5bSRussell King 717391f93f2SPeter Hurley if (mask & UPSTAT_AUTORTS) 7189aba8d5bSRussell King uart_clear_mctrl(port, TIOCM_RTS); 719b4749b97SPeter Hurley 720b4749b97SPeter Hurley if (mask & UPSTAT_AUTOXOFF) 721b4749b97SPeter Hurley uart_send_xchar(tty, STOP_CHAR(tty)); 7229ed19428SPeter Hurley 7239ed19428SPeter Hurley uart_port_deref(port); 724ab4382d2SGreg Kroah-Hartman } 725ab4382d2SGreg Kroah-Hartman 726ab4382d2SGreg Kroah-Hartman static void uart_unthrottle(struct tty_struct *tty) 727ab4382d2SGreg Kroah-Hartman { 728ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 729c5f78b1fSJeremy Kerr upstat_t mask = UPSTAT_SYNC_FIFO; 7309ed19428SPeter Hurley struct uart_port *port; 731ab4382d2SGreg Kroah-Hartman 7329ed19428SPeter Hurley port = uart_port_ref(state); 7339ed19428SPeter Hurley if (!port) 7349ed19428SPeter Hurley return; 7359ed19428SPeter Hurley 7369aba8d5bSRussell King if (I_IXOFF(tty)) 737391f93f2SPeter Hurley mask |= UPSTAT_AUTOXOFF; 7389db276f8SPeter Hurley if (C_CRTSCTS(tty)) 739391f93f2SPeter Hurley mask |= UPSTAT_AUTORTS; 7409aba8d5bSRussell King 741391f93f2SPeter Hurley if (port->status & mask) { 7429aba8d5bSRussell King port->ops->unthrottle(port); 743391f93f2SPeter Hurley mask &= ~port->status; 7449aba8d5bSRussell King } 7459aba8d5bSRussell King 746391f93f2SPeter Hurley if (mask & UPSTAT_AUTORTS) 747ab4382d2SGreg Kroah-Hartman uart_set_mctrl(port, TIOCM_RTS); 748b4749b97SPeter Hurley 749b4749b97SPeter Hurley if (mask & UPSTAT_AUTOXOFF) 750b4749b97SPeter Hurley uart_send_xchar(tty, START_CHAR(tty)); 7519ed19428SPeter Hurley 7529ed19428SPeter Hurley uart_port_deref(port); 753ab4382d2SGreg Kroah-Hartman } 754ab4382d2SGreg Kroah-Hartman 7554047b371SPeter Hurley static int uart_get_info(struct tty_port *port, struct serial_struct *retinfo) 756ab4382d2SGreg Kroah-Hartman { 7579f109694SAlan Cox struct uart_state *state = container_of(port, struct uart_state, port); 7584047b371SPeter Hurley struct uart_port *uport; 7594047b371SPeter Hurley int ret = -ENODEV; 7607ba2e769SAlan Cox 76137cd0c99SFengguang Wu memset(retinfo, 0, sizeof(*retinfo)); 7627ba2e769SAlan Cox 7633abe8c76SPeter Hurley /* 7643abe8c76SPeter Hurley * Ensure the state we copy is consistent and no hardware changes 7653abe8c76SPeter Hurley * occur as we go 7663abe8c76SPeter Hurley */ 7673abe8c76SPeter Hurley mutex_lock(&port->mutex); 7684047b371SPeter Hurley uport = uart_port_check(state); 7694047b371SPeter Hurley if (!uport) 7704047b371SPeter Hurley goto out; 7714047b371SPeter Hurley 7727ba2e769SAlan Cox retinfo->type = uport->type; 7737ba2e769SAlan Cox retinfo->line = uport->line; 7747ba2e769SAlan Cox retinfo->port = uport->iobase; 7757ba2e769SAlan Cox if (HIGH_BITS_OFFSET) 7767ba2e769SAlan Cox retinfo->port_high = (long) uport->iobase >> HIGH_BITS_OFFSET; 7777ba2e769SAlan Cox retinfo->irq = uport->irq; 778a17e74c5SAndy Shevchenko retinfo->flags = (__force int)uport->flags; 7797ba2e769SAlan Cox retinfo->xmit_fifo_size = uport->fifosize; 7807ba2e769SAlan Cox retinfo->baud_base = uport->uartclk / 16; 7817ba2e769SAlan Cox retinfo->close_delay = jiffies_to_msecs(port->close_delay) / 10; 7827ba2e769SAlan Cox retinfo->closing_wait = port->closing_wait == ASYNC_CLOSING_WAIT_NONE ? 7837ba2e769SAlan Cox ASYNC_CLOSING_WAIT_NONE : 7847ba2e769SAlan Cox jiffies_to_msecs(port->closing_wait) / 10; 7857ba2e769SAlan Cox retinfo->custom_divisor = uport->custom_divisor; 7867ba2e769SAlan Cox retinfo->hub6 = uport->hub6; 7877ba2e769SAlan Cox retinfo->io_type = uport->iotype; 7887ba2e769SAlan Cox retinfo->iomem_reg_shift = uport->regshift; 7897ba2e769SAlan Cox retinfo->iomem_base = (void *)(unsigned long)uport->mapbase; 7904047b371SPeter Hurley 7914047b371SPeter Hurley ret = 0; 7924047b371SPeter Hurley out: 793ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 7944047b371SPeter Hurley return ret; 7959f109694SAlan Cox } 7969f109694SAlan Cox 7975099d234SAl Viro static int uart_get_info_user(struct tty_struct *tty, 7985099d234SAl Viro struct serial_struct *ss) 7999f109694SAlan Cox { 8005099d234SAl Viro struct uart_state *state = tty->driver_data; 8015099d234SAl Viro struct tty_port *port = &state->port; 8023abe8c76SPeter Hurley 8035099d234SAl Viro return uart_get_info(port, ss) < 0 ? -EIO : 0; 804ab4382d2SGreg Kroah-Hartman } 805ab4382d2SGreg Kroah-Hartman 8067ba2e769SAlan Cox static int uart_set_info(struct tty_struct *tty, struct tty_port *port, 8077ba2e769SAlan Cox struct uart_state *state, 8087ba2e769SAlan Cox struct serial_struct *new_info) 809ab4382d2SGreg Kroah-Hartman { 8104047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 811ab4382d2SGreg Kroah-Hartman unsigned long new_port; 812ab4382d2SGreg Kroah-Hartman unsigned int change_irq, change_port, closing_wait; 813ab4382d2SGreg Kroah-Hartman unsigned int old_custom_divisor, close_delay; 814ab4382d2SGreg Kroah-Hartman upf_t old_flags, new_flags; 815ab4382d2SGreg Kroah-Hartman int retval = 0; 816ab4382d2SGreg Kroah-Hartman 8174047b371SPeter Hurley if (!uport) 8184047b371SPeter Hurley return -EIO; 8194047b371SPeter Hurley 8207ba2e769SAlan Cox new_port = new_info->port; 821ab4382d2SGreg Kroah-Hartman if (HIGH_BITS_OFFSET) 8227ba2e769SAlan Cox new_port += (unsigned long) new_info->port_high << HIGH_BITS_OFFSET; 823ab4382d2SGreg Kroah-Hartman 8247ba2e769SAlan Cox new_info->irq = irq_canonicalize(new_info->irq); 8257ba2e769SAlan Cox close_delay = msecs_to_jiffies(new_info->close_delay * 10); 8267ba2e769SAlan Cox closing_wait = new_info->closing_wait == ASYNC_CLOSING_WAIT_NONE ? 8274cb0fbfdSJiri Slaby ASYNC_CLOSING_WAIT_NONE : 8287ba2e769SAlan Cox msecs_to_jiffies(new_info->closing_wait * 10); 829ab4382d2SGreg Kroah-Hartman 830ab4382d2SGreg Kroah-Hartman 831ab4382d2SGreg Kroah-Hartman change_irq = !(uport->flags & UPF_FIXED_PORT) 8327ba2e769SAlan Cox && new_info->irq != uport->irq; 833ab4382d2SGreg Kroah-Hartman 834ab4382d2SGreg Kroah-Hartman /* 835ab4382d2SGreg Kroah-Hartman * Since changing the 'type' of the port changes its resource 836ab4382d2SGreg Kroah-Hartman * allocations, we should treat type changes the same as 837ab4382d2SGreg Kroah-Hartman * IO port changes. 838ab4382d2SGreg Kroah-Hartman */ 839ab4382d2SGreg Kroah-Hartman change_port = !(uport->flags & UPF_FIXED_PORT) 840ab4382d2SGreg Kroah-Hartman && (new_port != uport->iobase || 8417ba2e769SAlan Cox (unsigned long)new_info->iomem_base != uport->mapbase || 8427ba2e769SAlan Cox new_info->hub6 != uport->hub6 || 8437ba2e769SAlan Cox new_info->io_type != uport->iotype || 8447ba2e769SAlan Cox new_info->iomem_reg_shift != uport->regshift || 8457ba2e769SAlan Cox new_info->type != uport->type); 846ab4382d2SGreg Kroah-Hartman 847ab4382d2SGreg Kroah-Hartman old_flags = uport->flags; 848a17e74c5SAndy Shevchenko new_flags = (__force upf_t)new_info->flags; 849ab4382d2SGreg Kroah-Hartman old_custom_divisor = uport->custom_divisor; 850ab4382d2SGreg Kroah-Hartman 851ab4382d2SGreg Kroah-Hartman if (!capable(CAP_SYS_ADMIN)) { 852ab4382d2SGreg Kroah-Hartman retval = -EPERM; 853ab4382d2SGreg Kroah-Hartman if (change_irq || change_port || 8547ba2e769SAlan Cox (new_info->baud_base != uport->uartclk / 16) || 855ab4382d2SGreg Kroah-Hartman (close_delay != port->close_delay) || 856ab4382d2SGreg Kroah-Hartman (closing_wait != port->closing_wait) || 8577ba2e769SAlan Cox (new_info->xmit_fifo_size && 8587ba2e769SAlan Cox new_info->xmit_fifo_size != uport->fifosize) || 859ab4382d2SGreg Kroah-Hartman (((new_flags ^ old_flags) & ~UPF_USR_MASK) != 0)) 860ab4382d2SGreg Kroah-Hartman goto exit; 861ab4382d2SGreg Kroah-Hartman uport->flags = ((uport->flags & ~UPF_USR_MASK) | 862ab4382d2SGreg Kroah-Hartman (new_flags & UPF_USR_MASK)); 8637ba2e769SAlan Cox uport->custom_divisor = new_info->custom_divisor; 864ab4382d2SGreg Kroah-Hartman goto check_and_exit; 865ab4382d2SGreg Kroah-Hartman } 866ab4382d2SGreg Kroah-Hartman 867794edf30SDavid Howells retval = security_locked_down(LOCKDOWN_TIOCSSERIAL); 868794edf30SDavid Howells if (retval && (change_irq || change_port)) 869794edf30SDavid Howells goto exit; 870794edf30SDavid Howells 871ab4382d2SGreg Kroah-Hartman /* 872ab4382d2SGreg Kroah-Hartman * Ask the low level driver to verify the settings. 873ab4382d2SGreg Kroah-Hartman */ 874ab4382d2SGreg Kroah-Hartman if (uport->ops->verify_port) 8757ba2e769SAlan Cox retval = uport->ops->verify_port(uport, new_info); 876ab4382d2SGreg Kroah-Hartman 8777ba2e769SAlan Cox if ((new_info->irq >= nr_irqs) || (new_info->irq < 0) || 8787ba2e769SAlan Cox (new_info->baud_base < 9600)) 879ab4382d2SGreg Kroah-Hartman retval = -EINVAL; 880ab4382d2SGreg Kroah-Hartman 881ab4382d2SGreg Kroah-Hartman if (retval) 882ab4382d2SGreg Kroah-Hartman goto exit; 883ab4382d2SGreg Kroah-Hartman 884ab4382d2SGreg Kroah-Hartman if (change_port || change_irq) { 885ab4382d2SGreg Kroah-Hartman retval = -EBUSY; 886ab4382d2SGreg Kroah-Hartman 887ab4382d2SGreg Kroah-Hartman /* 888ab4382d2SGreg Kroah-Hartman * Make sure that we are the sole user of this port. 889ab4382d2SGreg Kroah-Hartman */ 890ab4382d2SGreg Kroah-Hartman if (tty_port_users(port) > 1) 891ab4382d2SGreg Kroah-Hartman goto exit; 892ab4382d2SGreg Kroah-Hartman 893ab4382d2SGreg Kroah-Hartman /* 894ab4382d2SGreg Kroah-Hartman * We need to shutdown the serial port at the old 895ab4382d2SGreg Kroah-Hartman * port/type/irq combination. 896ab4382d2SGreg Kroah-Hartman */ 897ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 898ab4382d2SGreg Kroah-Hartman } 899ab4382d2SGreg Kroah-Hartman 900ab4382d2SGreg Kroah-Hartman if (change_port) { 901ab4382d2SGreg Kroah-Hartman unsigned long old_iobase, old_mapbase; 902ab4382d2SGreg Kroah-Hartman unsigned int old_type, old_iotype, old_hub6, old_shift; 903ab4382d2SGreg Kroah-Hartman 904ab4382d2SGreg Kroah-Hartman old_iobase = uport->iobase; 905ab4382d2SGreg Kroah-Hartman old_mapbase = uport->mapbase; 906ab4382d2SGreg Kroah-Hartman old_type = uport->type; 907ab4382d2SGreg Kroah-Hartman old_hub6 = uport->hub6; 908ab4382d2SGreg Kroah-Hartman old_iotype = uport->iotype; 909ab4382d2SGreg Kroah-Hartman old_shift = uport->regshift; 910ab4382d2SGreg Kroah-Hartman 911ab4382d2SGreg Kroah-Hartman /* 912ab4382d2SGreg Kroah-Hartman * Free and release old regions 913ab4382d2SGreg Kroah-Hartman */ 914a7cfaf16SFabio Estevam if (old_type != PORT_UNKNOWN && uport->ops->release_port) 915ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 916ab4382d2SGreg Kroah-Hartman 917ab4382d2SGreg Kroah-Hartman uport->iobase = new_port; 9187ba2e769SAlan Cox uport->type = new_info->type; 9197ba2e769SAlan Cox uport->hub6 = new_info->hub6; 9207ba2e769SAlan Cox uport->iotype = new_info->io_type; 9217ba2e769SAlan Cox uport->regshift = new_info->iomem_reg_shift; 9227ba2e769SAlan Cox uport->mapbase = (unsigned long)new_info->iomem_base; 923ab4382d2SGreg Kroah-Hartman 924ab4382d2SGreg Kroah-Hartman /* 925ab4382d2SGreg Kroah-Hartman * Claim and map the new regions 926ab4382d2SGreg Kroah-Hartman */ 927a7cfaf16SFabio Estevam if (uport->type != PORT_UNKNOWN && uport->ops->request_port) { 928ab4382d2SGreg Kroah-Hartman retval = uport->ops->request_port(uport); 929ab4382d2SGreg Kroah-Hartman } else { 930ab4382d2SGreg Kroah-Hartman /* Always success - Jean II */ 931ab4382d2SGreg Kroah-Hartman retval = 0; 932ab4382d2SGreg Kroah-Hartman } 933ab4382d2SGreg Kroah-Hartman 934ab4382d2SGreg Kroah-Hartman /* 935ab4382d2SGreg Kroah-Hartman * If we fail to request resources for the 936ab4382d2SGreg Kroah-Hartman * new port, try to restore the old settings. 937ab4382d2SGreg Kroah-Hartman */ 9387deb39edSThomas Pfaff if (retval) { 939ab4382d2SGreg Kroah-Hartman uport->iobase = old_iobase; 940ab4382d2SGreg Kroah-Hartman uport->type = old_type; 941ab4382d2SGreg Kroah-Hartman uport->hub6 = old_hub6; 942ab4382d2SGreg Kroah-Hartman uport->iotype = old_iotype; 943ab4382d2SGreg Kroah-Hartman uport->regshift = old_shift; 944ab4382d2SGreg Kroah-Hartman uport->mapbase = old_mapbase; 9457deb39edSThomas Pfaff 9467deb39edSThomas Pfaff if (old_type != PORT_UNKNOWN) { 947ab4382d2SGreg Kroah-Hartman retval = uport->ops->request_port(uport); 948ab4382d2SGreg Kroah-Hartman /* 949ab4382d2SGreg Kroah-Hartman * If we failed to restore the old settings, 950ab4382d2SGreg Kroah-Hartman * we fail like this. 951ab4382d2SGreg Kroah-Hartman */ 952ab4382d2SGreg Kroah-Hartman if (retval) 953ab4382d2SGreg Kroah-Hartman uport->type = PORT_UNKNOWN; 954ab4382d2SGreg Kroah-Hartman 955ab4382d2SGreg Kroah-Hartman /* 956ab4382d2SGreg Kroah-Hartman * We failed anyway. 957ab4382d2SGreg Kroah-Hartman */ 958ab4382d2SGreg Kroah-Hartman retval = -EBUSY; 9597deb39edSThomas Pfaff } 9607deb39edSThomas Pfaff 961ab4382d2SGreg Kroah-Hartman /* Added to return the correct error -Ram Gupta */ 962ab4382d2SGreg Kroah-Hartman goto exit; 963ab4382d2SGreg Kroah-Hartman } 964ab4382d2SGreg Kroah-Hartman } 965ab4382d2SGreg Kroah-Hartman 966ab4382d2SGreg Kroah-Hartman if (change_irq) 9677ba2e769SAlan Cox uport->irq = new_info->irq; 968ab4382d2SGreg Kroah-Hartman if (!(uport->flags & UPF_FIXED_PORT)) 9697ba2e769SAlan Cox uport->uartclk = new_info->baud_base * 16; 970ab4382d2SGreg Kroah-Hartman uport->flags = (uport->flags & ~UPF_CHANGE_MASK) | 971ab4382d2SGreg Kroah-Hartman (new_flags & UPF_CHANGE_MASK); 9727ba2e769SAlan Cox uport->custom_divisor = new_info->custom_divisor; 973ab4382d2SGreg Kroah-Hartman port->close_delay = close_delay; 974ab4382d2SGreg Kroah-Hartman port->closing_wait = closing_wait; 9757ba2e769SAlan Cox if (new_info->xmit_fifo_size) 9767ba2e769SAlan Cox uport->fifosize = new_info->xmit_fifo_size; 977d6c53c0eSJiri Slaby port->low_latency = (uport->flags & UPF_LOW_LATENCY) ? 1 : 0; 978ab4382d2SGreg Kroah-Hartman 979ab4382d2SGreg Kroah-Hartman check_and_exit: 980ab4382d2SGreg Kroah-Hartman retval = 0; 981ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) 982ab4382d2SGreg Kroah-Hartman goto exit; 983d41861caSPeter Hurley if (tty_port_initialized(port)) { 984ab4382d2SGreg Kroah-Hartman if (((old_flags ^ uport->flags) & UPF_SPD_MASK) || 985ab4382d2SGreg Kroah-Hartman old_custom_divisor != uport->custom_divisor) { 986ab4382d2SGreg Kroah-Hartman /* 987ab4382d2SGreg Kroah-Hartman * If they're setting up a custom divisor or speed, 988dc2f7271SJohan Hovold * instead of clearing it, then bitch about it. 989ab4382d2SGreg Kroah-Hartman */ 990ab4382d2SGreg Kroah-Hartman if (uport->flags & UPF_SPD_MASK) { 991dc2f7271SJohan Hovold dev_notice_ratelimited(uport->dev, 9922f2dafe7SSudip Mukherjee "%s sets custom speed on %s. This is deprecated.\n", 9932f2dafe7SSudip Mukherjee current->comm, 994429b4749SRasmus Villemoes tty_name(port->tty)); 995ab4382d2SGreg Kroah-Hartman } 996ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 997ab4382d2SGreg Kroah-Hartman } 998b3b57646SRob Herring } else { 999ab4382d2SGreg Kroah-Hartman retval = uart_startup(tty, state, 1); 100044117a1dSSebastian Andrzej Siewior if (retval == 0) 100144117a1dSSebastian Andrzej Siewior tty_port_set_initialized(port, true); 1002b3b57646SRob Herring if (retval > 0) 1003b3b57646SRob Herring retval = 0; 1004b3b57646SRob Herring } 1005ab4382d2SGreg Kroah-Hartman exit: 10067ba2e769SAlan Cox return retval; 10077ba2e769SAlan Cox } 10087ba2e769SAlan Cox 10095099d234SAl Viro static int uart_set_info_user(struct tty_struct *tty, struct serial_struct *ss) 10107ba2e769SAlan Cox { 10115099d234SAl Viro struct uart_state *state = tty->driver_data; 10127ba2e769SAlan Cox struct tty_port *port = &state->port; 10137ba2e769SAlan Cox int retval; 10147ba2e769SAlan Cox 10155099d234SAl Viro down_write(&tty->termios_rwsem); 10167ba2e769SAlan Cox /* 10177ba2e769SAlan Cox * This semaphore protects port->count. It is also 10187ba2e769SAlan Cox * very useful to prevent opens. Also, take the 10197ba2e769SAlan Cox * port configuration semaphore to make sure that a 10207ba2e769SAlan Cox * module insertion/removal doesn't change anything 10217ba2e769SAlan Cox * under us. 10227ba2e769SAlan Cox */ 10237ba2e769SAlan Cox mutex_lock(&port->mutex); 10245099d234SAl Viro retval = uart_set_info(tty, port, state, ss); 1025ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 10265099d234SAl Viro up_write(&tty->termios_rwsem); 1027ab4382d2SGreg Kroah-Hartman return retval; 1028ab4382d2SGreg Kroah-Hartman } 1029ab4382d2SGreg Kroah-Hartman 1030ab4382d2SGreg Kroah-Hartman /** 1031ab4382d2SGreg Kroah-Hartman * uart_get_lsr_info - get line status register info 1032ab4382d2SGreg Kroah-Hartman * @tty: tty associated with the UART 1033ab4382d2SGreg Kroah-Hartman * @state: UART being queried 1034ab4382d2SGreg Kroah-Hartman * @value: returned modem value 1035ab4382d2SGreg Kroah-Hartman */ 1036ab4382d2SGreg Kroah-Hartman static int uart_get_lsr_info(struct tty_struct *tty, 1037ab4382d2SGreg Kroah-Hartman struct uart_state *state, unsigned int __user *value) 1038ab4382d2SGreg Kroah-Hartman { 10394047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 1040ab4382d2SGreg Kroah-Hartman unsigned int result; 1041ab4382d2SGreg Kroah-Hartman 1042ab4382d2SGreg Kroah-Hartman result = uport->ops->tx_empty(uport); 1043ab4382d2SGreg Kroah-Hartman 1044ab4382d2SGreg Kroah-Hartman /* 1045ab4382d2SGreg Kroah-Hartman * If we're about to load something into the transmit 1046ab4382d2SGreg Kroah-Hartman * register, we'll pretend the transmitter isn't empty to 1047ab4382d2SGreg Kroah-Hartman * avoid a race condition (depending on when the transmit 1048ab4382d2SGreg Kroah-Hartman * interrupt happens). 1049ab4382d2SGreg Kroah-Hartman */ 1050ab4382d2SGreg Kroah-Hartman if (uport->x_char || 1051ab4382d2SGreg Kroah-Hartman ((uart_circ_chars_pending(&state->xmit) > 0) && 1052d01f4d18SPeter Hurley !uart_tx_stopped(uport))) 1053ab4382d2SGreg Kroah-Hartman result &= ~TIOCSER_TEMT; 1054ab4382d2SGreg Kroah-Hartman 1055ab4382d2SGreg Kroah-Hartman return put_user(result, value); 1056ab4382d2SGreg Kroah-Hartman } 1057ab4382d2SGreg Kroah-Hartman 105860b33c13SAlan Cox static int uart_tiocmget(struct tty_struct *tty) 1059ab4382d2SGreg Kroah-Hartman { 1060ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1061ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 10624047b371SPeter Hurley struct uart_port *uport; 1063ab4382d2SGreg Kroah-Hartman int result = -EIO; 1064ab4382d2SGreg Kroah-Hartman 1065ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 10664047b371SPeter Hurley uport = uart_port_check(state); 10674047b371SPeter Hurley if (!uport) 10684047b371SPeter Hurley goto out; 10694047b371SPeter Hurley 107018900ca6SPeter Hurley if (!tty_io_error(tty)) { 1071ab4382d2SGreg Kroah-Hartman result = uport->mctrl; 1072ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1073ab4382d2SGreg Kroah-Hartman result |= uport->ops->get_mctrl(uport); 1074ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1075ab4382d2SGreg Kroah-Hartman } 10764047b371SPeter Hurley out: 1077ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1078ab4382d2SGreg Kroah-Hartman return result; 1079ab4382d2SGreg Kroah-Hartman } 1080ab4382d2SGreg Kroah-Hartman 1081ab4382d2SGreg Kroah-Hartman static int 108220b9d177SAlan Cox uart_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear) 1083ab4382d2SGreg Kroah-Hartman { 1084ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1085ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 10864047b371SPeter Hurley struct uart_port *uport; 1087ab4382d2SGreg Kroah-Hartman int ret = -EIO; 1088ab4382d2SGreg Kroah-Hartman 1089ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 10904047b371SPeter Hurley uport = uart_port_check(state); 10914047b371SPeter Hurley if (!uport) 10924047b371SPeter Hurley goto out; 10934047b371SPeter Hurley 109418900ca6SPeter Hurley if (!tty_io_error(tty)) { 1095ab4382d2SGreg Kroah-Hartman uart_update_mctrl(uport, set, clear); 1096ab4382d2SGreg Kroah-Hartman ret = 0; 1097ab4382d2SGreg Kroah-Hartman } 10984047b371SPeter Hurley out: 1099ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1100ab4382d2SGreg Kroah-Hartman return ret; 1101ab4382d2SGreg Kroah-Hartman } 1102ab4382d2SGreg Kroah-Hartman 1103ab4382d2SGreg Kroah-Hartman static int uart_break_ctl(struct tty_struct *tty, int break_state) 1104ab4382d2SGreg Kroah-Hartman { 1105ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1106ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 11074047b371SPeter Hurley struct uart_port *uport; 11084047b371SPeter Hurley int ret = -EIO; 1109ab4382d2SGreg Kroah-Hartman 1110ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 11114047b371SPeter Hurley uport = uart_port_check(state); 11124047b371SPeter Hurley if (!uport) 11134047b371SPeter Hurley goto out; 1114ab4382d2SGreg Kroah-Hartman 11157d73170eSJiangfeng Xiao if (uport->type != PORT_UNKNOWN && uport->ops->break_ctl) 1116ab4382d2SGreg Kroah-Hartman uport->ops->break_ctl(uport, break_state); 11174047b371SPeter Hurley ret = 0; 11184047b371SPeter Hurley out: 1119ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 11204047b371SPeter Hurley return ret; 1121ab4382d2SGreg Kroah-Hartman } 1122ab4382d2SGreg Kroah-Hartman 1123ab4382d2SGreg Kroah-Hartman static int uart_do_autoconfig(struct tty_struct *tty,struct uart_state *state) 1124ab4382d2SGreg Kroah-Hartman { 1125ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 11264047b371SPeter Hurley struct uart_port *uport; 1127ab4382d2SGreg Kroah-Hartman int flags, ret; 1128ab4382d2SGreg Kroah-Hartman 1129ab4382d2SGreg Kroah-Hartman if (!capable(CAP_SYS_ADMIN)) 1130ab4382d2SGreg Kroah-Hartman return -EPERM; 1131ab4382d2SGreg Kroah-Hartman 1132ab4382d2SGreg Kroah-Hartman /* 1133ab4382d2SGreg Kroah-Hartman * Take the per-port semaphore. This prevents count from 1134ab4382d2SGreg Kroah-Hartman * changing, and hence any extra opens of the port while 1135ab4382d2SGreg Kroah-Hartman * we're auto-configuring. 1136ab4382d2SGreg Kroah-Hartman */ 1137ab4382d2SGreg Kroah-Hartman if (mutex_lock_interruptible(&port->mutex)) 1138ab4382d2SGreg Kroah-Hartman return -ERESTARTSYS; 1139ab4382d2SGreg Kroah-Hartman 11404047b371SPeter Hurley uport = uart_port_check(state); 11414047b371SPeter Hurley if (!uport) { 11424047b371SPeter Hurley ret = -EIO; 11434047b371SPeter Hurley goto out; 11444047b371SPeter Hurley } 11454047b371SPeter Hurley 1146ab4382d2SGreg Kroah-Hartman ret = -EBUSY; 1147ab4382d2SGreg Kroah-Hartman if (tty_port_users(port) == 1) { 1148ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 1149ab4382d2SGreg Kroah-Hartman 1150ab4382d2SGreg Kroah-Hartman /* 1151ab4382d2SGreg Kroah-Hartman * If we already have a port type configured, 1152ab4382d2SGreg Kroah-Hartman * we must release its resources. 1153ab4382d2SGreg Kroah-Hartman */ 1154a7cfaf16SFabio Estevam if (uport->type != PORT_UNKNOWN && uport->ops->release_port) 1155ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 1156ab4382d2SGreg Kroah-Hartman 1157ab4382d2SGreg Kroah-Hartman flags = UART_CONFIG_TYPE; 1158ab4382d2SGreg Kroah-Hartman if (uport->flags & UPF_AUTO_IRQ) 1159ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_IRQ; 1160ab4382d2SGreg Kroah-Hartman 1161ab4382d2SGreg Kroah-Hartman /* 1162ab4382d2SGreg Kroah-Hartman * This will claim the ports resources if 1163ab4382d2SGreg Kroah-Hartman * a port is found. 1164ab4382d2SGreg Kroah-Hartman */ 1165ab4382d2SGreg Kroah-Hartman uport->ops->config_port(uport, flags); 1166ab4382d2SGreg Kroah-Hartman 1167ab4382d2SGreg Kroah-Hartman ret = uart_startup(tty, state, 1); 116871456906SSebastian Andrzej Siewior if (ret == 0) 116971456906SSebastian Andrzej Siewior tty_port_set_initialized(port, true); 1170b3b57646SRob Herring if (ret > 0) 1171b3b57646SRob Herring ret = 0; 1172ab4382d2SGreg Kroah-Hartman } 11734047b371SPeter Hurley out: 1174ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1175ab4382d2SGreg Kroah-Hartman return ret; 1176ab4382d2SGreg Kroah-Hartman } 1177ab4382d2SGreg Kroah-Hartman 11781fdc3106SAlexander Shiyan static void uart_enable_ms(struct uart_port *uport) 11791fdc3106SAlexander Shiyan { 11801fdc3106SAlexander Shiyan /* 11811fdc3106SAlexander Shiyan * Force modem status interrupts on 11821fdc3106SAlexander Shiyan */ 11831fdc3106SAlexander Shiyan if (uport->ops->enable_ms) 11841fdc3106SAlexander Shiyan uport->ops->enable_ms(uport); 11851fdc3106SAlexander Shiyan } 11861fdc3106SAlexander Shiyan 1187ab4382d2SGreg Kroah-Hartman /* 1188ab4382d2SGreg Kroah-Hartman * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change 1189ab4382d2SGreg Kroah-Hartman * - mask passed in arg for lines of interest 1190ab4382d2SGreg Kroah-Hartman * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) 1191ab4382d2SGreg Kroah-Hartman * Caller should use TIOCGICOUNT to see which one it was 1192ab4382d2SGreg Kroah-Hartman * 1193ab4382d2SGreg Kroah-Hartman * FIXME: This wants extracting into a common all driver implementation 1194ab4382d2SGreg Kroah-Hartman * of TIOCMWAIT using tty_port. 1195ab4382d2SGreg Kroah-Hartman */ 11969ed19428SPeter Hurley static int uart_wait_modem_status(struct uart_state *state, unsigned long arg) 1197ab4382d2SGreg Kroah-Hartman { 11989ed19428SPeter Hurley struct uart_port *uport; 1199ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1200ab4382d2SGreg Kroah-Hartman DECLARE_WAITQUEUE(wait, current); 1201ab4382d2SGreg Kroah-Hartman struct uart_icount cprev, cnow; 1202ab4382d2SGreg Kroah-Hartman int ret; 1203ab4382d2SGreg Kroah-Hartman 1204ab4382d2SGreg Kroah-Hartman /* 1205ab4382d2SGreg Kroah-Hartman * note the counters on entry 1206ab4382d2SGreg Kroah-Hartman */ 12079ed19428SPeter Hurley uport = uart_port_ref(state); 12089ed19428SPeter Hurley if (!uport) 12099ed19428SPeter Hurley return -EIO; 1210ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1211ab4382d2SGreg Kroah-Hartman memcpy(&cprev, &uport->icount, sizeof(struct uart_icount)); 12121fdc3106SAlexander Shiyan uart_enable_ms(uport); 1213ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1214ab4382d2SGreg Kroah-Hartman 1215ab4382d2SGreg Kroah-Hartman add_wait_queue(&port->delta_msr_wait, &wait); 1216ab4382d2SGreg Kroah-Hartman for (;;) { 1217ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1218ab4382d2SGreg Kroah-Hartman memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); 1219ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 1220ab4382d2SGreg Kroah-Hartman 1221ab4382d2SGreg Kroah-Hartman set_current_state(TASK_INTERRUPTIBLE); 1222ab4382d2SGreg Kroah-Hartman 1223ab4382d2SGreg Kroah-Hartman if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) || 1224ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) || 1225ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) || 1226ab4382d2SGreg Kroah-Hartman ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) { 1227ab4382d2SGreg Kroah-Hartman ret = 0; 1228ab4382d2SGreg Kroah-Hartman break; 1229ab4382d2SGreg Kroah-Hartman } 1230ab4382d2SGreg Kroah-Hartman 1231ab4382d2SGreg Kroah-Hartman schedule(); 1232ab4382d2SGreg Kroah-Hartman 1233ab4382d2SGreg Kroah-Hartman /* see if a signal did it */ 1234ab4382d2SGreg Kroah-Hartman if (signal_pending(current)) { 1235ab4382d2SGreg Kroah-Hartman ret = -ERESTARTSYS; 1236ab4382d2SGreg Kroah-Hartman break; 1237ab4382d2SGreg Kroah-Hartman } 1238ab4382d2SGreg Kroah-Hartman 1239ab4382d2SGreg Kroah-Hartman cprev = cnow; 1240ab4382d2SGreg Kroah-Hartman } 124197f9f707SFabian Frederick __set_current_state(TASK_RUNNING); 1242ab4382d2SGreg Kroah-Hartman remove_wait_queue(&port->delta_msr_wait, &wait); 12439ed19428SPeter Hurley uart_port_deref(uport); 1244ab4382d2SGreg Kroah-Hartman 1245ab4382d2SGreg Kroah-Hartman return ret; 1246ab4382d2SGreg Kroah-Hartman } 1247ab4382d2SGreg Kroah-Hartman 1248ab4382d2SGreg Kroah-Hartman /* 1249ab4382d2SGreg Kroah-Hartman * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) 1250ab4382d2SGreg Kroah-Hartman * Return: write counters to the user passed counter struct 1251ab4382d2SGreg Kroah-Hartman * NB: both 1->0 and 0->1 transitions are counted except for 1252ab4382d2SGreg Kroah-Hartman * RI where only 0->1 is counted. 1253ab4382d2SGreg Kroah-Hartman */ 1254ab4382d2SGreg Kroah-Hartman static int uart_get_icount(struct tty_struct *tty, 1255ab4382d2SGreg Kroah-Hartman struct serial_icounter_struct *icount) 1256ab4382d2SGreg Kroah-Hartman { 1257ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1258ab4382d2SGreg Kroah-Hartman struct uart_icount cnow; 12599ed19428SPeter Hurley struct uart_port *uport; 1260ab4382d2SGreg Kroah-Hartman 12619ed19428SPeter Hurley uport = uart_port_ref(state); 12629ed19428SPeter Hurley if (!uport) 12639ed19428SPeter Hurley return -EIO; 1264ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1265ab4382d2SGreg Kroah-Hartman memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); 1266ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 12679ed19428SPeter Hurley uart_port_deref(uport); 1268ab4382d2SGreg Kroah-Hartman 1269ab4382d2SGreg Kroah-Hartman icount->cts = cnow.cts; 1270ab4382d2SGreg Kroah-Hartman icount->dsr = cnow.dsr; 1271ab4382d2SGreg Kroah-Hartman icount->rng = cnow.rng; 1272ab4382d2SGreg Kroah-Hartman icount->dcd = cnow.dcd; 1273ab4382d2SGreg Kroah-Hartman icount->rx = cnow.rx; 1274ab4382d2SGreg Kroah-Hartman icount->tx = cnow.tx; 1275ab4382d2SGreg Kroah-Hartman icount->frame = cnow.frame; 1276ab4382d2SGreg Kroah-Hartman icount->overrun = cnow.overrun; 1277ab4382d2SGreg Kroah-Hartman icount->parity = cnow.parity; 1278ab4382d2SGreg Kroah-Hartman icount->brk = cnow.brk; 1279ab4382d2SGreg Kroah-Hartman icount->buf_overrun = cnow.buf_overrun; 1280ab4382d2SGreg Kroah-Hartman 1281ab4382d2SGreg Kroah-Hartman return 0; 1282ab4382d2SGreg Kroah-Hartman } 1283ab4382d2SGreg Kroah-Hartman 1284a5f276f1SRicardo Ribalda Delgado static int uart_get_rs485_config(struct uart_port *port, 1285a5f276f1SRicardo Ribalda Delgado struct serial_rs485 __user *rs485) 1286a5f276f1SRicardo Ribalda Delgado { 1287bd737f87SRicardo Ribalda Delgado unsigned long flags; 1288bd737f87SRicardo Ribalda Delgado struct serial_rs485 aux; 1289bd737f87SRicardo Ribalda Delgado 1290bd737f87SRicardo Ribalda Delgado spin_lock_irqsave(&port->lock, flags); 1291bd737f87SRicardo Ribalda Delgado aux = port->rs485; 1292bd737f87SRicardo Ribalda Delgado spin_unlock_irqrestore(&port->lock, flags); 1293bd737f87SRicardo Ribalda Delgado 1294bd737f87SRicardo Ribalda Delgado if (copy_to_user(rs485, &aux, sizeof(aux))) 1295a5f276f1SRicardo Ribalda Delgado return -EFAULT; 1296bd737f87SRicardo Ribalda Delgado 1297a5f276f1SRicardo Ribalda Delgado return 0; 1298a5f276f1SRicardo Ribalda Delgado } 1299a5f276f1SRicardo Ribalda Delgado 1300a5f276f1SRicardo Ribalda Delgado static int uart_set_rs485_config(struct uart_port *port, 1301a5f276f1SRicardo Ribalda Delgado struct serial_rs485 __user *rs485_user) 1302a5f276f1SRicardo Ribalda Delgado { 1303a5f276f1SRicardo Ribalda Delgado struct serial_rs485 rs485; 1304a5f276f1SRicardo Ribalda Delgado int ret; 1305bd737f87SRicardo Ribalda Delgado unsigned long flags; 1306a5f276f1SRicardo Ribalda Delgado 1307a5f276f1SRicardo Ribalda Delgado if (!port->rs485_config) 1308a5f276f1SRicardo Ribalda Delgado return -ENOIOCTLCMD; 1309a5f276f1SRicardo Ribalda Delgado 1310a5f276f1SRicardo Ribalda Delgado if (copy_from_user(&rs485, rs485_user, sizeof(*rs485_user))) 1311a5f276f1SRicardo Ribalda Delgado return -EFAULT; 1312a5f276f1SRicardo Ribalda Delgado 1313bd737f87SRicardo Ribalda Delgado spin_lock_irqsave(&port->lock, flags); 1314a5f276f1SRicardo Ribalda Delgado ret = port->rs485_config(port, &rs485); 1315bd737f87SRicardo Ribalda Delgado spin_unlock_irqrestore(&port->lock, flags); 1316a5f276f1SRicardo Ribalda Delgado if (ret) 1317a5f276f1SRicardo Ribalda Delgado return ret; 1318a5f276f1SRicardo Ribalda Delgado 1319a5f276f1SRicardo Ribalda Delgado if (copy_to_user(rs485_user, &port->rs485, sizeof(port->rs485))) 1320a5f276f1SRicardo Ribalda Delgado return -EFAULT; 1321a5f276f1SRicardo Ribalda Delgado 1322a5f276f1SRicardo Ribalda Delgado return 0; 1323a5f276f1SRicardo Ribalda Delgado } 1324a5f276f1SRicardo Ribalda Delgado 1325ad8c0eaaSNicolas Ferre static int uart_get_iso7816_config(struct uart_port *port, 1326ad8c0eaaSNicolas Ferre struct serial_iso7816 __user *iso7816) 1327ad8c0eaaSNicolas Ferre { 1328ad8c0eaaSNicolas Ferre unsigned long flags; 1329ad8c0eaaSNicolas Ferre struct serial_iso7816 aux; 1330ad8c0eaaSNicolas Ferre 1331ad8c0eaaSNicolas Ferre if (!port->iso7816_config) 1332ad8c0eaaSNicolas Ferre return -ENOIOCTLCMD; 1333ad8c0eaaSNicolas Ferre 1334ad8c0eaaSNicolas Ferre spin_lock_irqsave(&port->lock, flags); 1335ad8c0eaaSNicolas Ferre aux = port->iso7816; 1336ad8c0eaaSNicolas Ferre spin_unlock_irqrestore(&port->lock, flags); 1337ad8c0eaaSNicolas Ferre 1338ad8c0eaaSNicolas Ferre if (copy_to_user(iso7816, &aux, sizeof(aux))) 1339ad8c0eaaSNicolas Ferre return -EFAULT; 1340ad8c0eaaSNicolas Ferre 1341ad8c0eaaSNicolas Ferre return 0; 1342ad8c0eaaSNicolas Ferre } 1343ad8c0eaaSNicolas Ferre 1344ad8c0eaaSNicolas Ferre static int uart_set_iso7816_config(struct uart_port *port, 1345ad8c0eaaSNicolas Ferre struct serial_iso7816 __user *iso7816_user) 1346ad8c0eaaSNicolas Ferre { 1347ad8c0eaaSNicolas Ferre struct serial_iso7816 iso7816; 1348ad8c0eaaSNicolas Ferre int i, ret; 1349ad8c0eaaSNicolas Ferre unsigned long flags; 1350ad8c0eaaSNicolas Ferre 1351ad8c0eaaSNicolas Ferre if (!port->iso7816_config) 1352ad8c0eaaSNicolas Ferre return -ENOIOCTLCMD; 1353ad8c0eaaSNicolas Ferre 1354ad8c0eaaSNicolas Ferre if (copy_from_user(&iso7816, iso7816_user, sizeof(*iso7816_user))) 1355ad8c0eaaSNicolas Ferre return -EFAULT; 1356ad8c0eaaSNicolas Ferre 1357ad8c0eaaSNicolas Ferre /* 1358ad8c0eaaSNicolas Ferre * There are 5 words reserved for future use. Check that userspace 1359ad8c0eaaSNicolas Ferre * doesn't put stuff in there to prevent breakages in the future. 1360ad8c0eaaSNicolas Ferre */ 1361ad8c0eaaSNicolas Ferre for (i = 0; i < 5; i++) 1362ad8c0eaaSNicolas Ferre if (iso7816.reserved[i]) 1363ad8c0eaaSNicolas Ferre return -EINVAL; 1364ad8c0eaaSNicolas Ferre 1365ad8c0eaaSNicolas Ferre spin_lock_irqsave(&port->lock, flags); 1366ad8c0eaaSNicolas Ferre ret = port->iso7816_config(port, &iso7816); 1367ad8c0eaaSNicolas Ferre spin_unlock_irqrestore(&port->lock, flags); 1368ad8c0eaaSNicolas Ferre if (ret) 1369ad8c0eaaSNicolas Ferre return ret; 1370ad8c0eaaSNicolas Ferre 1371ad8c0eaaSNicolas Ferre if (copy_to_user(iso7816_user, &port->iso7816, sizeof(port->iso7816))) 1372ad8c0eaaSNicolas Ferre return -EFAULT; 1373ad8c0eaaSNicolas Ferre 1374ad8c0eaaSNicolas Ferre return 0; 1375ad8c0eaaSNicolas Ferre } 1376ad8c0eaaSNicolas Ferre 1377ab4382d2SGreg Kroah-Hartman /* 1378ab4382d2SGreg Kroah-Hartman * Called via sys_ioctl. We can use spin_lock_irq() here. 1379ab4382d2SGreg Kroah-Hartman */ 1380ab4382d2SGreg Kroah-Hartman static int 13814047b371SPeter Hurley uart_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg) 1382ab4382d2SGreg Kroah-Hartman { 1383ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1384ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 13854047b371SPeter Hurley struct uart_port *uport; 1386ab4382d2SGreg Kroah-Hartman void __user *uarg = (void __user *)arg; 1387ab4382d2SGreg Kroah-Hartman int ret = -ENOIOCTLCMD; 1388ab4382d2SGreg Kroah-Hartman 1389ab4382d2SGreg Kroah-Hartman 1390ab4382d2SGreg Kroah-Hartman /* 1391ab4382d2SGreg Kroah-Hartman * These ioctls don't rely on the hardware to be present. 1392ab4382d2SGreg Kroah-Hartman */ 1393ab4382d2SGreg Kroah-Hartman switch (cmd) { 1394ab4382d2SGreg Kroah-Hartman case TIOCSERCONFIG: 13957c8ab967SPeter Hurley down_write(&tty->termios_rwsem); 1396ab4382d2SGreg Kroah-Hartman ret = uart_do_autoconfig(tty, state); 13977c8ab967SPeter Hurley up_write(&tty->termios_rwsem); 1398ab4382d2SGreg Kroah-Hartman break; 1399ab4382d2SGreg Kroah-Hartman } 1400ab4382d2SGreg Kroah-Hartman 1401ab4382d2SGreg Kroah-Hartman if (ret != -ENOIOCTLCMD) 1402ab4382d2SGreg Kroah-Hartman goto out; 1403ab4382d2SGreg Kroah-Hartman 140418900ca6SPeter Hurley if (tty_io_error(tty)) { 1405ab4382d2SGreg Kroah-Hartman ret = -EIO; 1406ab4382d2SGreg Kroah-Hartman goto out; 1407ab4382d2SGreg Kroah-Hartman } 1408ab4382d2SGreg Kroah-Hartman 1409ab4382d2SGreg Kroah-Hartman /* 1410ab4382d2SGreg Kroah-Hartman * The following should only be used when hardware is present. 1411ab4382d2SGreg Kroah-Hartman */ 1412ab4382d2SGreg Kroah-Hartman switch (cmd) { 1413ab4382d2SGreg Kroah-Hartman case TIOCMIWAIT: 1414ab4382d2SGreg Kroah-Hartman ret = uart_wait_modem_status(state, arg); 1415ab4382d2SGreg Kroah-Hartman break; 1416ab4382d2SGreg Kroah-Hartman } 1417ab4382d2SGreg Kroah-Hartman 1418ab4382d2SGreg Kroah-Hartman if (ret != -ENOIOCTLCMD) 1419ab4382d2SGreg Kroah-Hartman goto out; 1420ab4382d2SGreg Kroah-Hartman 1421ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 14224047b371SPeter Hurley uport = uart_port_check(state); 1423ab4382d2SGreg Kroah-Hartman 14244047b371SPeter Hurley if (!uport || tty_io_error(tty)) { 1425ab4382d2SGreg Kroah-Hartman ret = -EIO; 1426ab4382d2SGreg Kroah-Hartman goto out_up; 1427ab4382d2SGreg Kroah-Hartman } 1428ab4382d2SGreg Kroah-Hartman 1429ab4382d2SGreg Kroah-Hartman /* 1430ab4382d2SGreg Kroah-Hartman * All these rely on hardware being present and need to be 1431ab4382d2SGreg Kroah-Hartman * protected against the tty being hung up. 1432ab4382d2SGreg Kroah-Hartman */ 1433a9c20a9cSRicardo Ribalda Delgado 1434ab4382d2SGreg Kroah-Hartman switch (cmd) { 1435a9c20a9cSRicardo Ribalda Delgado case TIOCSERGETLSR: /* Get line status register */ 1436a9c20a9cSRicardo Ribalda Delgado ret = uart_get_lsr_info(tty, state, uarg); 1437a9c20a9cSRicardo Ribalda Delgado break; 1438a9c20a9cSRicardo Ribalda Delgado 1439a5f276f1SRicardo Ribalda Delgado case TIOCGRS485: 14404047b371SPeter Hurley ret = uart_get_rs485_config(uport, uarg); 1441a5f276f1SRicardo Ribalda Delgado break; 1442a5f276f1SRicardo Ribalda Delgado 1443a5f276f1SRicardo Ribalda Delgado case TIOCSRS485: 14444047b371SPeter Hurley ret = uart_set_rs485_config(uport, uarg); 1445a5f276f1SRicardo Ribalda Delgado break; 1446ad8c0eaaSNicolas Ferre 1447ad8c0eaaSNicolas Ferre case TIOCSISO7816: 1448ad8c0eaaSNicolas Ferre ret = uart_set_iso7816_config(state->uart_port, uarg); 1449ad8c0eaaSNicolas Ferre break; 1450ad8c0eaaSNicolas Ferre 1451ad8c0eaaSNicolas Ferre case TIOCGISO7816: 1452ad8c0eaaSNicolas Ferre ret = uart_get_iso7816_config(state->uart_port, uarg); 1453ad8c0eaaSNicolas Ferre break; 14544047b371SPeter Hurley default: 1455ab4382d2SGreg Kroah-Hartman if (uport->ops->ioctl) 1456ab4382d2SGreg Kroah-Hartman ret = uport->ops->ioctl(uport, cmd, arg); 1457ab4382d2SGreg Kroah-Hartman break; 1458ab4382d2SGreg Kroah-Hartman } 1459ab4382d2SGreg Kroah-Hartman out_up: 1460ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1461ab4382d2SGreg Kroah-Hartman out: 1462ab4382d2SGreg Kroah-Hartman return ret; 1463ab4382d2SGreg Kroah-Hartman } 1464ab4382d2SGreg Kroah-Hartman 1465ab4382d2SGreg Kroah-Hartman static void uart_set_ldisc(struct tty_struct *tty) 1466ab4382d2SGreg Kroah-Hartman { 1467ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 14684047b371SPeter Hurley struct uart_port *uport; 1469ab4382d2SGreg Kroah-Hartman 1470db1b9dfcSPeter Hurley mutex_lock(&state->port.mutex); 14714047b371SPeter Hurley uport = uart_port_check(state); 14724047b371SPeter Hurley if (uport && uport->ops->set_ldisc) 1473732a84a0SPeter Hurley uport->ops->set_ldisc(uport, &tty->termios); 1474db1b9dfcSPeter Hurley mutex_unlock(&state->port.mutex); 1475db1b9dfcSPeter Hurley } 1476ab4382d2SGreg Kroah-Hartman 1477ab4382d2SGreg Kroah-Hartman static void uart_set_termios(struct tty_struct *tty, 1478ab4382d2SGreg Kroah-Hartman struct ktermios *old_termios) 1479ab4382d2SGreg Kroah-Hartman { 1480ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 14814047b371SPeter Hurley struct uart_port *uport; 1482adc8d746SAlan Cox unsigned int cflag = tty->termios.c_cflag; 14832cbacafdSRussell King unsigned int iflag_mask = IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK; 14842cbacafdSRussell King bool sw_changed = false; 1485ab4382d2SGreg Kroah-Hartman 14864047b371SPeter Hurley mutex_lock(&state->port.mutex); 14874047b371SPeter Hurley uport = uart_port_check(state); 14884047b371SPeter Hurley if (!uport) 14894047b371SPeter Hurley goto out; 14904047b371SPeter Hurley 14912cbacafdSRussell King /* 14922cbacafdSRussell King * Drivers doing software flow control also need to know 14932cbacafdSRussell King * about changes to these input settings. 14942cbacafdSRussell King */ 14952cbacafdSRussell King if (uport->flags & UPF_SOFT_FLOW) { 14962cbacafdSRussell King iflag_mask |= IXANY|IXON|IXOFF; 14972cbacafdSRussell King sw_changed = 14982cbacafdSRussell King tty->termios.c_cc[VSTART] != old_termios->c_cc[VSTART] || 14992cbacafdSRussell King tty->termios.c_cc[VSTOP] != old_termios->c_cc[VSTOP]; 15002cbacafdSRussell King } 1501ab4382d2SGreg Kroah-Hartman 1502ab4382d2SGreg Kroah-Hartman /* 1503ab4382d2SGreg Kroah-Hartman * These are the bits that are used to setup various 1504ab4382d2SGreg Kroah-Hartman * flags in the low level driver. We can ignore the Bfoo 1505ab4382d2SGreg Kroah-Hartman * bits in c_cflag; c_[io]speed will always be set 1506ab4382d2SGreg Kroah-Hartman * appropriately by set_termios() in tty_ioctl.c 1507ab4382d2SGreg Kroah-Hartman */ 1508ab4382d2SGreg Kroah-Hartman if ((cflag ^ old_termios->c_cflag) == 0 && 1509adc8d746SAlan Cox tty->termios.c_ospeed == old_termios->c_ospeed && 1510adc8d746SAlan Cox tty->termios.c_ispeed == old_termios->c_ispeed && 15112cbacafdSRussell King ((tty->termios.c_iflag ^ old_termios->c_iflag) & iflag_mask) == 0 && 15122cbacafdSRussell King !sw_changed) { 15134047b371SPeter Hurley goto out; 1514ab4382d2SGreg Kroah-Hartman } 1515ab4382d2SGreg Kroah-Hartman 1516ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, old_termios); 1517c7a6b9e4SHariprasad Kelam /* reload cflag from termios; port driver may have overridden flags */ 1518c18b55fdSPeter Hurley cflag = tty->termios.c_cflag; 1519ab4382d2SGreg Kroah-Hartman 1520ab4382d2SGreg Kroah-Hartman /* Handle transition to B0 status */ 1521ab4382d2SGreg Kroah-Hartman if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) 1522dec94e70SRussell King uart_clear_mctrl(uport, TIOCM_RTS | TIOCM_DTR); 1523ab4382d2SGreg Kroah-Hartman /* Handle transition away from B0 status */ 1524ab4382d2SGreg Kroah-Hartman else if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { 1525ab4382d2SGreg Kroah-Hartman unsigned int mask = TIOCM_DTR; 152697ef38b8SPeter Hurley if (!(cflag & CRTSCTS) || !tty_throttled(tty)) 1527ab4382d2SGreg Kroah-Hartman mask |= TIOCM_RTS; 1528dec94e70SRussell King uart_set_mctrl(uport, mask); 1529ab4382d2SGreg Kroah-Hartman } 15304047b371SPeter Hurley out: 15314047b371SPeter Hurley mutex_unlock(&state->port.mutex); 1532ab4382d2SGreg Kroah-Hartman } 1533ab4382d2SGreg Kroah-Hartman 1534ab4382d2SGreg Kroah-Hartman /* 1535ef4f527cSKevin Cernekee * Calls to uart_close() are serialised via the tty_lock in 1536ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:tty_release() 1537ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:do_tty_hangup() 1538ab4382d2SGreg Kroah-Hartman */ 1539ab4382d2SGreg Kroah-Hartman static void uart_close(struct tty_struct *tty, struct file *filp) 1540ab4382d2SGreg Kroah-Hartman { 1541ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1542ab4382d2SGreg Kroah-Hartman 154391b32f54SPeter Hurley if (!state) { 154491b32f54SPeter Hurley struct uart_driver *drv = tty->driver->driver_state; 15459356335fSColin Ian King struct tty_port *port; 154691b32f54SPeter Hurley 154791b32f54SPeter Hurley state = drv->state + tty->index; 154891b32f54SPeter Hurley port = &state->port; 154991b32f54SPeter Hurley spin_lock_irq(&port->lock); 155091b32f54SPeter Hurley --port->count; 155191b32f54SPeter Hurley spin_unlock_irq(&port->lock); 1552ab4382d2SGreg Kroah-Hartman return; 155391b32f54SPeter Hurley } 1554ab4382d2SGreg Kroah-Hartman 155539b3d892SPeter Hurley pr_debug("uart_close(%d) called\n", tty->index); 1556ab4382d2SGreg Kroah-Hartman 1557761ed4a9SRob Herring tty_port_close(tty->port, tty, filp); 1558761ed4a9SRob Herring } 1559ab4382d2SGreg Kroah-Hartman 1560761ed4a9SRob Herring static void uart_tty_port_shutdown(struct tty_port *port) 1561761ed4a9SRob Herring { 1562761ed4a9SRob Herring struct uart_state *state = container_of(port, struct uart_state, port); 1563761ed4a9SRob Herring struct uart_port *uport = uart_port_check(state); 1564af224ca2SPeter Hurley 1565ab4382d2SGreg Kroah-Hartman /* 1566ab4382d2SGreg Kroah-Hartman * At this point, we stop accepting input. To do this, we 1567ab4382d2SGreg Kroah-Hartman * disable the receive line status interrupts. 1568ab4382d2SGreg Kroah-Hartman */ 1569a5a2b130SAndy Shevchenko if (WARN(!uport, "detached port still initialized!\n")) 1570a5a2b130SAndy Shevchenko return; 1571761ed4a9SRob Herring 1572a5a2b130SAndy Shevchenko spin_lock_irq(&uport->lock); 1573ab4382d2SGreg Kroah-Hartman uport->ops->stop_rx(uport); 15746fb98fb3SPeter Hurley spin_unlock_irq(&uport->lock); 1575761ed4a9SRob Herring 1576761ed4a9SRob Herring uart_port_shutdown(port); 1577761ed4a9SRob Herring 1578ab4382d2SGreg Kroah-Hartman /* 1579761ed4a9SRob Herring * It's possible for shutdown to be called after suspend if we get 1580761ed4a9SRob Herring * a DCD drop (hangup) at just the right time. Clear suspended bit so 1581761ed4a9SRob Herring * we don't try to resume a port that has been shutdown. 1582ab4382d2SGreg Kroah-Hartman */ 1583761ed4a9SRob Herring tty_port_set_suspended(port, 0); 1584ab4382d2SGreg Kroah-Hartman 15856f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_OFF); 1586ab4382d2SGreg Kroah-Hartman 1587ab4382d2SGreg Kroah-Hartman } 1588ab4382d2SGreg Kroah-Hartman 15891f33a51dSJiri Slaby static void uart_wait_until_sent(struct tty_struct *tty, int timeout) 1590ab4382d2SGreg Kroah-Hartman { 15911f33a51dSJiri Slaby struct uart_state *state = tty->driver_data; 15929ed19428SPeter Hurley struct uart_port *port; 1593ab4382d2SGreg Kroah-Hartman unsigned long char_time, expire; 1594ab4382d2SGreg Kroah-Hartman 15959ed19428SPeter Hurley port = uart_port_ref(state); 1596ef510beaSAndy Shevchenko if (!port) 1597ef510beaSAndy Shevchenko return; 1598ef510beaSAndy Shevchenko 1599ef510beaSAndy Shevchenko if (port->type == PORT_UNKNOWN || port->fifosize == 0) { 16009ed19428SPeter Hurley uart_port_deref(port); 1601ab4382d2SGreg Kroah-Hartman return; 16029ed19428SPeter Hurley } 1603ab4382d2SGreg Kroah-Hartman 1604ab4382d2SGreg Kroah-Hartman /* 1605ab4382d2SGreg Kroah-Hartman * Set the check interval to be 1/5 of the estimated time to 1606ab4382d2SGreg Kroah-Hartman * send a single character, and make it at least 1. The check 1607ab4382d2SGreg Kroah-Hartman * interval should also be less than the timeout. 1608ab4382d2SGreg Kroah-Hartman * 1609ab4382d2SGreg Kroah-Hartman * Note: we have to use pretty tight timings here to satisfy 1610ab4382d2SGreg Kroah-Hartman * the NIST-PCTS. 1611ab4382d2SGreg Kroah-Hartman */ 1612ab4382d2SGreg Kroah-Hartman char_time = (port->timeout - HZ/50) / port->fifosize; 1613ab4382d2SGreg Kroah-Hartman char_time = char_time / 5; 1614ab4382d2SGreg Kroah-Hartman if (char_time == 0) 1615ab4382d2SGreg Kroah-Hartman char_time = 1; 1616ab4382d2SGreg Kroah-Hartman if (timeout && timeout < char_time) 1617ab4382d2SGreg Kroah-Hartman char_time = timeout; 1618ab4382d2SGreg Kroah-Hartman 1619ab4382d2SGreg Kroah-Hartman /* 1620ab4382d2SGreg Kroah-Hartman * If the transmitter hasn't cleared in twice the approximate 1621ab4382d2SGreg Kroah-Hartman * amount of time to send the entire FIFO, it probably won't 1622ab4382d2SGreg Kroah-Hartman * ever clear. This assumes the UART isn't doing flow 1623ab4382d2SGreg Kroah-Hartman * control, which is currently the case. Hence, if it ever 1624ab4382d2SGreg Kroah-Hartman * takes longer than port->timeout, this is probably due to a 1625ab4382d2SGreg Kroah-Hartman * UART bug of some kind. So, we clamp the timeout parameter at 1626ab4382d2SGreg Kroah-Hartman * 2*port->timeout. 1627ab4382d2SGreg Kroah-Hartman */ 1628ab4382d2SGreg Kroah-Hartman if (timeout == 0 || timeout > 2 * port->timeout) 1629ab4382d2SGreg Kroah-Hartman timeout = 2 * port->timeout; 1630ab4382d2SGreg Kroah-Hartman 1631ab4382d2SGreg Kroah-Hartman expire = jiffies + timeout; 1632ab4382d2SGreg Kroah-Hartman 1633ab4382d2SGreg Kroah-Hartman pr_debug("uart_wait_until_sent(%d), jiffies=%lu, expire=%lu...\n", 1634ab4382d2SGreg Kroah-Hartman port->line, jiffies, expire); 1635ab4382d2SGreg Kroah-Hartman 1636ab4382d2SGreg Kroah-Hartman /* 1637ab4382d2SGreg Kroah-Hartman * Check whether the transmitter is empty every 'char_time'. 1638ab4382d2SGreg Kroah-Hartman * 'timeout' / 'expire' give us the maximum amount of time 1639ab4382d2SGreg Kroah-Hartman * we wait. 1640ab4382d2SGreg Kroah-Hartman */ 1641ab4382d2SGreg Kroah-Hartman while (!port->ops->tx_empty(port)) { 1642ab4382d2SGreg Kroah-Hartman msleep_interruptible(jiffies_to_msecs(char_time)); 1643ab4382d2SGreg Kroah-Hartman if (signal_pending(current)) 1644ab4382d2SGreg Kroah-Hartman break; 1645ab4382d2SGreg Kroah-Hartman if (time_after(jiffies, expire)) 1646ab4382d2SGreg Kroah-Hartman break; 1647ab4382d2SGreg Kroah-Hartman } 16489ed19428SPeter Hurley uart_port_deref(port); 1649ab4382d2SGreg Kroah-Hartman } 1650ab4382d2SGreg Kroah-Hartman 1651ab4382d2SGreg Kroah-Hartman /* 1652ef4f527cSKevin Cernekee * Calls to uart_hangup() are serialised by the tty_lock in 1653ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:do_tty_hangup() 1654ef4f527cSKevin Cernekee * This runs from a workqueue and can sleep for a _short_ time only. 1655ab4382d2SGreg Kroah-Hartman */ 1656ab4382d2SGreg Kroah-Hartman static void uart_hangup(struct tty_struct *tty) 1657ab4382d2SGreg Kroah-Hartman { 1658ab4382d2SGreg Kroah-Hartman struct uart_state *state = tty->driver_data; 1659ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 1660af224ca2SPeter Hurley struct uart_port *uport; 1661ab4382d2SGreg Kroah-Hartman unsigned long flags; 1662ab4382d2SGreg Kroah-Hartman 166339b3d892SPeter Hurley pr_debug("uart_hangup(%d)\n", tty->index); 1664ab4382d2SGreg Kroah-Hartman 1665ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 1666af224ca2SPeter Hurley uport = uart_port_check(state); 1667af224ca2SPeter Hurley WARN(!uport, "hangup of detached port!\n"); 1668af224ca2SPeter Hurley 1669807c8d81SPeter Hurley if (tty_port_active(port)) { 1670ab4382d2SGreg Kroah-Hartman uart_flush_buffer(tty); 1671ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 1672ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 1673ab4382d2SGreg Kroah-Hartman port->count = 0; 1674ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 1675807c8d81SPeter Hurley tty_port_set_active(port, 0); 1676ab4382d2SGreg Kroah-Hartman tty_port_tty_set(port, NULL); 1677af224ca2SPeter Hurley if (uport && !uart_console(uport)) 1678bf903c0cSGeert Uytterhoeven uart_change_pm(state, UART_PM_STATE_OFF); 1679ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->open_wait); 1680ab4382d2SGreg Kroah-Hartman wake_up_interruptible(&port->delta_msr_wait); 1681ab4382d2SGreg Kroah-Hartman } 1682ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 1683ab4382d2SGreg Kroah-Hartman } 1684ab4382d2SGreg Kroah-Hartman 1685af224ca2SPeter Hurley /* uport == NULL if uart_port has already been removed */ 16860b1db830SJiri Slaby static void uart_port_shutdown(struct tty_port *port) 16870b1db830SJiri Slaby { 1688b922e19dSJiri Slaby struct uart_state *state = container_of(port, struct uart_state, port); 16894047b371SPeter Hurley struct uart_port *uport = uart_port_check(state); 1690b922e19dSJiri Slaby 1691b922e19dSJiri Slaby /* 1692b922e19dSJiri Slaby * clear delta_msr_wait queue to avoid mem leaks: we may free 1693b922e19dSJiri Slaby * the irq here so the queue might never be woken up. Note 1694b922e19dSJiri Slaby * that we won't end up waiting on delta_msr_wait again since 1695b922e19dSJiri Slaby * any outstanding file descriptors should be pointing at 1696b922e19dSJiri Slaby * hung_up_tty_fops now. 1697b922e19dSJiri Slaby */ 1698b922e19dSJiri Slaby wake_up_interruptible(&port->delta_msr_wait); 1699b922e19dSJiri Slaby 1700b922e19dSJiri Slaby /* 1701b922e19dSJiri Slaby * Free the IRQ and disable the port. 1702b922e19dSJiri Slaby */ 1703af224ca2SPeter Hurley if (uport) 1704b922e19dSJiri Slaby uport->ops->shutdown(uport); 1705b922e19dSJiri Slaby 1706b922e19dSJiri Slaby /* 1707b922e19dSJiri Slaby * Ensure that the IRQ handler isn't running on another CPU. 1708b922e19dSJiri Slaby */ 1709af224ca2SPeter Hurley if (uport) 1710b922e19dSJiri Slaby synchronize_irq(uport->irq); 17110b1db830SJiri Slaby } 17120b1db830SJiri Slaby 1713ab4382d2SGreg Kroah-Hartman static int uart_carrier_raised(struct tty_port *port) 1714ab4382d2SGreg Kroah-Hartman { 1715ab4382d2SGreg Kroah-Hartman struct uart_state *state = container_of(port, struct uart_state, port); 17169ed19428SPeter Hurley struct uart_port *uport; 1717ab4382d2SGreg Kroah-Hartman int mctrl; 17189ed19428SPeter Hurley 17199ed19428SPeter Hurley uport = uart_port_ref(state); 17209ed19428SPeter Hurley /* 17219ed19428SPeter Hurley * Should never observe uport == NULL since checks for hangup should 17229ed19428SPeter Hurley * abort the tty_port_block_til_ready() loop before checking for carrier 17239ed19428SPeter Hurley * raised -- but report carrier raised if it does anyway so open will 17249ed19428SPeter Hurley * continue and not sleep 17259ed19428SPeter Hurley */ 17269ed19428SPeter Hurley if (WARN_ON(!uport)) 17279ed19428SPeter Hurley return 1; 1728ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 17291fdc3106SAlexander Shiyan uart_enable_ms(uport); 1730ab4382d2SGreg Kroah-Hartman mctrl = uport->ops->get_mctrl(uport); 1731ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 17329ed19428SPeter Hurley uart_port_deref(uport); 1733ab4382d2SGreg Kroah-Hartman if (mctrl & TIOCM_CAR) 1734ab4382d2SGreg Kroah-Hartman return 1; 1735ab4382d2SGreg Kroah-Hartman return 0; 1736ab4382d2SGreg Kroah-Hartman } 1737ab4382d2SGreg Kroah-Hartman 1738a6845e1eSRafael Gago static void uart_dtr_rts(struct tty_port *port, int raise) 1739ab4382d2SGreg Kroah-Hartman { 1740ab4382d2SGreg Kroah-Hartman struct uart_state *state = container_of(port, struct uart_state, port); 17419ed19428SPeter Hurley struct uart_port *uport; 17429ed19428SPeter Hurley 17439ed19428SPeter Hurley uport = uart_port_ref(state); 17449ed19428SPeter Hurley if (!uport) 17459ed19428SPeter Hurley return; 1746a6845e1eSRafael Gago uart_port_dtr_rts(uport, raise); 17479ed19428SPeter Hurley uart_port_deref(uport); 1748ab4382d2SGreg Kroah-Hartman } 1749ab4382d2SGreg Kroah-Hartman 17504cdd17baSJiri Slaby static int uart_install(struct tty_driver *driver, struct tty_struct *tty) 17514cdd17baSJiri Slaby { 17524cdd17baSJiri Slaby struct uart_driver *drv = driver->driver_state; 17534cdd17baSJiri Slaby struct uart_state *state = drv->state + tty->index; 17544cdd17baSJiri Slaby 17554cdd17baSJiri Slaby tty->driver_data = state; 17564cdd17baSJiri Slaby 17574cdd17baSJiri Slaby return tty_standard_install(driver, tty); 17584cdd17baSJiri Slaby } 17594cdd17baSJiri Slaby 1760ab4382d2SGreg Kroah-Hartman /* 1761ef4f527cSKevin Cernekee * Calls to uart_open are serialised by the tty_lock in 1762ef4f527cSKevin Cernekee * drivers/tty/tty_io.c:tty_open() 1763ab4382d2SGreg Kroah-Hartman * Note that if this fails, then uart_close() _will_ be called. 1764ab4382d2SGreg Kroah-Hartman * 1765ab4382d2SGreg Kroah-Hartman * In time, we want to scrap the "opening nonpresent ports" 1766ab4382d2SGreg Kroah-Hartman * behaviour and implement an alternative way for setserial 1767ab4382d2SGreg Kroah-Hartman * to set base addresses/ports/types. This will allow us to 1768ab4382d2SGreg Kroah-Hartman * get rid of a certain amount of extra tests. 1769ab4382d2SGreg Kroah-Hartman */ 1770ab4382d2SGreg Kroah-Hartman static int uart_open(struct tty_struct *tty, struct file *filp) 1771ab4382d2SGreg Kroah-Hartman { 17724cdd17baSJiri Slaby struct uart_state *state = tty->driver_data; 17734cdd17baSJiri Slaby int retval; 1774b3b57646SRob Herring 1775b3b57646SRob Herring retval = tty_port_open(&state->port, tty, filp); 1776b3b57646SRob Herring if (retval > 0) 1777b3b57646SRob Herring retval = 0; 1778b3b57646SRob Herring 1779b3b57646SRob Herring return retval; 1780b3b57646SRob Herring } 1781b3b57646SRob Herring 1782b3b57646SRob Herring static int uart_port_activate(struct tty_port *port, struct tty_struct *tty) 1783b3b57646SRob Herring { 1784b3b57646SRob Herring struct uart_state *state = container_of(port, struct uart_state, port); 1785b3b57646SRob Herring struct uart_port *uport; 178613b18d35SSerge Semin int ret; 1787b3b57646SRob Herring 1788b3b57646SRob Herring uport = uart_port_check(state); 1789b3b57646SRob Herring if (!uport || uport->flags & UPF_DEAD) 1790b3b57646SRob Herring return -ENXIO; 1791b3b57646SRob Herring 17924047b371SPeter Hurley port->low_latency = (uport->flags & UPF_LOW_LATENCY) ? 1 : 0; 1793ab4382d2SGreg Kroah-Hartman 1794ab4382d2SGreg Kroah-Hartman /* 1795ab4382d2SGreg Kroah-Hartman * Start up the serial port. 1796ab4382d2SGreg Kroah-Hartman */ 179713b18d35SSerge Semin ret = uart_startup(tty, state, 0); 179813b18d35SSerge Semin if (ret > 0) 179913b18d35SSerge Semin tty_port_set_active(port, 1); 180013b18d35SSerge Semin 180113b18d35SSerge Semin return ret; 1802ab4382d2SGreg Kroah-Hartman } 1803ab4382d2SGreg Kroah-Hartman 1804ab4382d2SGreg Kroah-Hartman static const char *uart_type(struct uart_port *port) 1805ab4382d2SGreg Kroah-Hartman { 1806ab4382d2SGreg Kroah-Hartman const char *str = NULL; 1807ab4382d2SGreg Kroah-Hartman 1808ab4382d2SGreg Kroah-Hartman if (port->ops->type) 1809ab4382d2SGreg Kroah-Hartman str = port->ops->type(port); 1810ab4382d2SGreg Kroah-Hartman 1811ab4382d2SGreg Kroah-Hartman if (!str) 1812ab4382d2SGreg Kroah-Hartman str = "unknown"; 1813ab4382d2SGreg Kroah-Hartman 1814ab4382d2SGreg Kroah-Hartman return str; 1815ab4382d2SGreg Kroah-Hartman } 1816ab4382d2SGreg Kroah-Hartman 1817ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_PROC_FS 1818ab4382d2SGreg Kroah-Hartman 1819ab4382d2SGreg Kroah-Hartman static void uart_line_info(struct seq_file *m, struct uart_driver *drv, int i) 1820ab4382d2SGreg Kroah-Hartman { 1821ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + i; 1822ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 18236f538fe3SLinus Walleij enum uart_pm_state pm_state; 18244047b371SPeter Hurley struct uart_port *uport; 1825ab4382d2SGreg Kroah-Hartman char stat_buf[32]; 1826ab4382d2SGreg Kroah-Hartman unsigned int status; 1827ab4382d2SGreg Kroah-Hartman int mmio; 1828ab4382d2SGreg Kroah-Hartman 18294047b371SPeter Hurley mutex_lock(&port->mutex); 18304047b371SPeter Hurley uport = uart_port_check(state); 1831ab4382d2SGreg Kroah-Hartman if (!uport) 18324047b371SPeter Hurley goto out; 1833ab4382d2SGreg Kroah-Hartman 1834ab4382d2SGreg Kroah-Hartman mmio = uport->iotype >= UPIO_MEM; 1835ab4382d2SGreg Kroah-Hartman seq_printf(m, "%d: uart:%s %s%08llX irq:%d", 1836ab4382d2SGreg Kroah-Hartman uport->line, uart_type(uport), 1837ab4382d2SGreg Kroah-Hartman mmio ? "mmio:0x" : "port:", 1838ab4382d2SGreg Kroah-Hartman mmio ? (unsigned long long)uport->mapbase 1839ab4382d2SGreg Kroah-Hartman : (unsigned long long)uport->iobase, 1840ab4382d2SGreg Kroah-Hartman uport->irq); 1841ab4382d2SGreg Kroah-Hartman 1842ab4382d2SGreg Kroah-Hartman if (uport->type == PORT_UNKNOWN) { 1843ab4382d2SGreg Kroah-Hartman seq_putc(m, '\n'); 18444047b371SPeter Hurley goto out; 1845ab4382d2SGreg Kroah-Hartman } 1846ab4382d2SGreg Kroah-Hartman 1847ab4382d2SGreg Kroah-Hartman if (capable(CAP_SYS_ADMIN)) { 1848ab4382d2SGreg Kroah-Hartman pm_state = state->pm_state; 18496f538fe3SLinus Walleij if (pm_state != UART_PM_STATE_ON) 18506f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 1851ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 1852ab4382d2SGreg Kroah-Hartman status = uport->ops->get_mctrl(uport); 1853ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 18546f538fe3SLinus Walleij if (pm_state != UART_PM_STATE_ON) 1855ab4382d2SGreg Kroah-Hartman uart_change_pm(state, pm_state); 1856ab4382d2SGreg Kroah-Hartman 1857ab4382d2SGreg Kroah-Hartman seq_printf(m, " tx:%d rx:%d", 1858ab4382d2SGreg Kroah-Hartman uport->icount.tx, uport->icount.rx); 1859ab4382d2SGreg Kroah-Hartman if (uport->icount.frame) 1860968af298SPeter Hurley seq_printf(m, " fe:%d", uport->icount.frame); 1861ab4382d2SGreg Kroah-Hartman if (uport->icount.parity) 1862968af298SPeter Hurley seq_printf(m, " pe:%d", uport->icount.parity); 1863ab4382d2SGreg Kroah-Hartman if (uport->icount.brk) 1864968af298SPeter Hurley seq_printf(m, " brk:%d", uport->icount.brk); 1865ab4382d2SGreg Kroah-Hartman if (uport->icount.overrun) 1866968af298SPeter Hurley seq_printf(m, " oe:%d", uport->icount.overrun); 18674f794097SJeremy Kerr if (uport->icount.buf_overrun) 18684f794097SJeremy Kerr seq_printf(m, " bo:%d", uport->icount.buf_overrun); 1869ab4382d2SGreg Kroah-Hartman 1870ab4382d2SGreg Kroah-Hartman #define INFOBIT(bit, str) \ 1871ab4382d2SGreg Kroah-Hartman if (uport->mctrl & (bit)) \ 1872ab4382d2SGreg Kroah-Hartman strncat(stat_buf, (str), sizeof(stat_buf) - \ 1873ab4382d2SGreg Kroah-Hartman strlen(stat_buf) - 2) 1874ab4382d2SGreg Kroah-Hartman #define STATBIT(bit, str) \ 1875ab4382d2SGreg Kroah-Hartman if (status & (bit)) \ 1876ab4382d2SGreg Kroah-Hartman strncat(stat_buf, (str), sizeof(stat_buf) - \ 1877ab4382d2SGreg Kroah-Hartman strlen(stat_buf) - 2) 1878ab4382d2SGreg Kroah-Hartman 1879ab4382d2SGreg Kroah-Hartman stat_buf[0] = '\0'; 1880ab4382d2SGreg Kroah-Hartman stat_buf[1] = '\0'; 1881ab4382d2SGreg Kroah-Hartman INFOBIT(TIOCM_RTS, "|RTS"); 1882ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_CTS, "|CTS"); 1883ab4382d2SGreg Kroah-Hartman INFOBIT(TIOCM_DTR, "|DTR"); 1884ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_DSR, "|DSR"); 1885ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_CAR, "|CD"); 1886ab4382d2SGreg Kroah-Hartman STATBIT(TIOCM_RNG, "|RI"); 1887ab4382d2SGreg Kroah-Hartman if (stat_buf[0]) 1888ab4382d2SGreg Kroah-Hartman stat_buf[0] = ' '; 1889ab4382d2SGreg Kroah-Hartman 1890ab4382d2SGreg Kroah-Hartman seq_puts(m, stat_buf); 1891ab4382d2SGreg Kroah-Hartman } 1892ab4382d2SGreg Kroah-Hartman seq_putc(m, '\n'); 1893ab4382d2SGreg Kroah-Hartman #undef STATBIT 1894ab4382d2SGreg Kroah-Hartman #undef INFOBIT 18954047b371SPeter Hurley out: 18964047b371SPeter Hurley mutex_unlock(&port->mutex); 1897ab4382d2SGreg Kroah-Hartman } 1898ab4382d2SGreg Kroah-Hartman 1899ab4382d2SGreg Kroah-Hartman static int uart_proc_show(struct seq_file *m, void *v) 1900ab4382d2SGreg Kroah-Hartman { 1901ab4382d2SGreg Kroah-Hartman struct tty_driver *ttydrv = m->private; 1902ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = ttydrv->driver_state; 1903ab4382d2SGreg Kroah-Hartman int i; 1904ab4382d2SGreg Kroah-Hartman 1905968af298SPeter Hurley seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n", "", "", ""); 1906ab4382d2SGreg Kroah-Hartman for (i = 0; i < drv->nr; i++) 1907ab4382d2SGreg Kroah-Hartman uart_line_info(m, drv, i); 1908ab4382d2SGreg Kroah-Hartman return 0; 1909ab4382d2SGreg Kroah-Hartman } 1910ab4382d2SGreg Kroah-Hartman #endif 1911ab4382d2SGreg Kroah-Hartman 19127a49955aSAndy Shevchenko static inline bool uart_console_enabled(struct uart_port *port) 19137a49955aSAndy Shevchenko { 19147a49955aSAndy Shevchenko return uart_console(port) && (port->cons->flags & CON_ENABLED); 19157a49955aSAndy Shevchenko } 19167a49955aSAndy Shevchenko 1917d2403cadSAndy Shevchenko /* 1918d2403cadSAndy Shevchenko * Ensure that the serial console lock is initialised early. 1919d2403cadSAndy Shevchenko * If this port is a console, then the spinlock is already initialised. 1920d2403cadSAndy Shevchenko */ 1921d2403cadSAndy Shevchenko static inline void uart_port_spin_lock_init(struct uart_port *port) 1922d2403cadSAndy Shevchenko { 1923a3cb39d2SAndy Shevchenko if (uart_console(port)) 1924d2403cadSAndy Shevchenko return; 1925d2403cadSAndy Shevchenko 1926d2403cadSAndy Shevchenko spin_lock_init(&port->lock); 1927d2403cadSAndy Shevchenko lockdep_set_class(&port->lock, &port_lock_key); 1928d2403cadSAndy Shevchenko } 1929d2403cadSAndy Shevchenko 1930ab4382d2SGreg Kroah-Hartman #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL) 19311cfe42b7SPeter Hurley /** 1932ab4382d2SGreg Kroah-Hartman * uart_console_write - write a console message to a serial port 1933ab4382d2SGreg Kroah-Hartman * @port: the port to write the message 1934ab4382d2SGreg Kroah-Hartman * @s: array of characters 1935ab4382d2SGreg Kroah-Hartman * @count: number of characters in string to write 193610afbe34SPeter Hurley * @putchar: function to write character to port 1937ab4382d2SGreg Kroah-Hartman */ 1938ab4382d2SGreg Kroah-Hartman void uart_console_write(struct uart_port *port, const char *s, 1939ab4382d2SGreg Kroah-Hartman unsigned int count, 1940ab4382d2SGreg Kroah-Hartman void (*putchar)(struct uart_port *, int)) 1941ab4382d2SGreg Kroah-Hartman { 1942ab4382d2SGreg Kroah-Hartman unsigned int i; 1943ab4382d2SGreg Kroah-Hartman 1944ab4382d2SGreg Kroah-Hartman for (i = 0; i < count; i++, s++) { 1945ab4382d2SGreg Kroah-Hartman if (*s == '\n') 1946ab4382d2SGreg Kroah-Hartman putchar(port, '\r'); 1947ab4382d2SGreg Kroah-Hartman putchar(port, *s); 1948ab4382d2SGreg Kroah-Hartman } 1949ab4382d2SGreg Kroah-Hartman } 1950ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_console_write); 1951ab4382d2SGreg Kroah-Hartman 1952ab4382d2SGreg Kroah-Hartman /* 1953ab4382d2SGreg Kroah-Hartman * Check whether an invalid uart number has been specified, and 1954ab4382d2SGreg Kroah-Hartman * if so, search for the first available port that does have 1955ab4382d2SGreg Kroah-Hartman * console support. 1956ab4382d2SGreg Kroah-Hartman */ 1957ab4382d2SGreg Kroah-Hartman struct uart_port * __init 1958ab4382d2SGreg Kroah-Hartman uart_get_console(struct uart_port *ports, int nr, struct console *co) 1959ab4382d2SGreg Kroah-Hartman { 1960ab4382d2SGreg Kroah-Hartman int idx = co->index; 1961ab4382d2SGreg Kroah-Hartman 1962ab4382d2SGreg Kroah-Hartman if (idx < 0 || idx >= nr || (ports[idx].iobase == 0 && 1963ab4382d2SGreg Kroah-Hartman ports[idx].membase == NULL)) 1964ab4382d2SGreg Kroah-Hartman for (idx = 0; idx < nr; idx++) 1965ab4382d2SGreg Kroah-Hartman if (ports[idx].iobase != 0 || 1966ab4382d2SGreg Kroah-Hartman ports[idx].membase != NULL) 1967ab4382d2SGreg Kroah-Hartman break; 1968ab4382d2SGreg Kroah-Hartman 1969ab4382d2SGreg Kroah-Hartman co->index = idx; 1970ab4382d2SGreg Kroah-Hartman 1971ab4382d2SGreg Kroah-Hartman return ports + idx; 1972ab4382d2SGreg Kroah-Hartman } 1973ab4382d2SGreg Kroah-Hartman 1974ab4382d2SGreg Kroah-Hartman /** 197573abaf87SPeter Hurley * uart_parse_earlycon - Parse earlycon options 197673abaf87SPeter Hurley * @p: ptr to 2nd field (ie., just beyond '<name>,') 197773abaf87SPeter Hurley * @iotype: ptr for decoded iotype (out) 197873abaf87SPeter Hurley * @addr: ptr for decoded mapbase/iobase (out) 197973abaf87SPeter Hurley * @options: ptr for <options> field; NULL if not present (out) 198073abaf87SPeter Hurley * 198173abaf87SPeter Hurley * Decodes earlycon kernel command line parameters of the form 1982bd94c407SMasahiro Yamada * earlycon=<name>,io|mmio|mmio16|mmio32|mmio32be|mmio32native,<addr>,<options> 1983bd94c407SMasahiro Yamada * console=<name>,io|mmio|mmio16|mmio32|mmio32be|mmio32native,<addr>,<options> 198473abaf87SPeter Hurley * 198573abaf87SPeter Hurley * The optional form 1986ff30283aSRandy Dunlap * 198773abaf87SPeter Hurley * earlycon=<name>,0x<addr>,<options> 198873abaf87SPeter Hurley * console=<name>,0x<addr>,<options> 1989ff30283aSRandy Dunlap * 199073abaf87SPeter Hurley * is also accepted; the returned @iotype will be UPIO_MEM. 199173abaf87SPeter Hurley * 19928b2303deSAlexander Sverdlin * Returns 0 on success or -EINVAL on failure 199373abaf87SPeter Hurley */ 199446e36683SAlexander Sverdlin int uart_parse_earlycon(char *p, unsigned char *iotype, resource_size_t *addr, 199573abaf87SPeter Hurley char **options) 199673abaf87SPeter Hurley { 199773abaf87SPeter Hurley if (strncmp(p, "mmio,", 5) == 0) { 199873abaf87SPeter Hurley *iotype = UPIO_MEM; 199973abaf87SPeter Hurley p += 5; 2000bd94c407SMasahiro Yamada } else if (strncmp(p, "mmio16,", 7) == 0) { 2001bd94c407SMasahiro Yamada *iotype = UPIO_MEM16; 2002bd94c407SMasahiro Yamada p += 7; 200373abaf87SPeter Hurley } else if (strncmp(p, "mmio32,", 7) == 0) { 200473abaf87SPeter Hurley *iotype = UPIO_MEM32; 200573abaf87SPeter Hurley p += 7; 20066e63be3fSNoam Camus } else if (strncmp(p, "mmio32be,", 9) == 0) { 20076e63be3fSNoam Camus *iotype = UPIO_MEM32BE; 20086e63be3fSNoam Camus p += 9; 2009d215d809SMax Filippov } else if (strncmp(p, "mmio32native,", 13) == 0) { 2010d215d809SMax Filippov *iotype = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) ? 2011d215d809SMax Filippov UPIO_MEM32BE : UPIO_MEM32; 2012d215d809SMax Filippov p += 13; 201373abaf87SPeter Hurley } else if (strncmp(p, "io,", 3) == 0) { 201473abaf87SPeter Hurley *iotype = UPIO_PORT; 201573abaf87SPeter Hurley p += 3; 201673abaf87SPeter Hurley } else if (strncmp(p, "0x", 2) == 0) { 201773abaf87SPeter Hurley *iotype = UPIO_MEM; 201873abaf87SPeter Hurley } else { 201973abaf87SPeter Hurley return -EINVAL; 202073abaf87SPeter Hurley } 202173abaf87SPeter Hurley 20228b2303deSAlexander Sverdlin /* 20238b2303deSAlexander Sverdlin * Before you replace it with kstrtoull(), think about options separator 20248b2303deSAlexander Sverdlin * (',') it will not tolerate 20258b2303deSAlexander Sverdlin */ 20268b2303deSAlexander Sverdlin *addr = simple_strtoull(p, NULL, 0); 202773abaf87SPeter Hurley p = strchr(p, ','); 202873abaf87SPeter Hurley if (p) 202973abaf87SPeter Hurley p++; 203073abaf87SPeter Hurley 203173abaf87SPeter Hurley *options = p; 203273abaf87SPeter Hurley return 0; 203373abaf87SPeter Hurley } 203473abaf87SPeter Hurley EXPORT_SYMBOL_GPL(uart_parse_earlycon); 203573abaf87SPeter Hurley 203673abaf87SPeter Hurley /** 203702088ca6SGeert Uytterhoeven * uart_parse_options - Parse serial port baud/parity/bits/flow control. 2038ab4382d2SGreg Kroah-Hartman * @options: pointer to option string 2039ab4382d2SGreg Kroah-Hartman * @baud: pointer to an 'int' variable for the baud rate. 2040ab4382d2SGreg Kroah-Hartman * @parity: pointer to an 'int' variable for the parity. 2041ab4382d2SGreg Kroah-Hartman * @bits: pointer to an 'int' variable for the number of data bits. 2042ab4382d2SGreg Kroah-Hartman * @flow: pointer to an 'int' variable for the flow control character. 2043ab4382d2SGreg Kroah-Hartman * 2044ab4382d2SGreg Kroah-Hartman * uart_parse_options decodes a string containing the serial console 2045ab4382d2SGreg Kroah-Hartman * options. The format of the string is <baud><parity><bits><flow>, 2046ab4382d2SGreg Kroah-Hartman * eg: 115200n8r 2047ab4382d2SGreg Kroah-Hartman */ 2048ab4382d2SGreg Kroah-Hartman void 20490f646b63SPaul Cercueil uart_parse_options(const char *options, int *baud, int *parity, 20500f646b63SPaul Cercueil int *bits, int *flow) 2051ab4382d2SGreg Kroah-Hartman { 20520f646b63SPaul Cercueil const char *s = options; 2053ab4382d2SGreg Kroah-Hartman 2054ab4382d2SGreg Kroah-Hartman *baud = simple_strtoul(s, NULL, 10); 2055ab4382d2SGreg Kroah-Hartman while (*s >= '0' && *s <= '9') 2056ab4382d2SGreg Kroah-Hartman s++; 2057ab4382d2SGreg Kroah-Hartman if (*s) 2058ab4382d2SGreg Kroah-Hartman *parity = *s++; 2059ab4382d2SGreg Kroah-Hartman if (*s) 2060ab4382d2SGreg Kroah-Hartman *bits = *s++ - '0'; 2061ab4382d2SGreg Kroah-Hartman if (*s) 2062ab4382d2SGreg Kroah-Hartman *flow = *s; 2063ab4382d2SGreg Kroah-Hartman } 2064ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_parse_options); 2065ab4382d2SGreg Kroah-Hartman 2066ab4382d2SGreg Kroah-Hartman /** 2067ab4382d2SGreg Kroah-Hartman * uart_set_options - setup the serial console parameters 2068ab4382d2SGreg Kroah-Hartman * @port: pointer to the serial ports uart_port structure 2069ab4382d2SGreg Kroah-Hartman * @co: console pointer 2070ab4382d2SGreg Kroah-Hartman * @baud: baud rate 2071ab4382d2SGreg Kroah-Hartman * @parity: parity character - 'n' (none), 'o' (odd), 'e' (even) 2072ab4382d2SGreg Kroah-Hartman * @bits: number of data bits 2073ab4382d2SGreg Kroah-Hartman * @flow: flow control character - 'r' (rts) 2074ab4382d2SGreg Kroah-Hartman */ 2075ab4382d2SGreg Kroah-Hartman int 2076ab4382d2SGreg Kroah-Hartman uart_set_options(struct uart_port *port, struct console *co, 2077ab4382d2SGreg Kroah-Hartman int baud, int parity, int bits, int flow) 2078ab4382d2SGreg Kroah-Hartman { 2079ab4382d2SGreg Kroah-Hartman struct ktermios termios; 2080ab4382d2SGreg Kroah-Hartman static struct ktermios dummy; 2081ab4382d2SGreg Kroah-Hartman 2082d2403cadSAndy Shevchenko uart_port_spin_lock_init(port); 2083ab4382d2SGreg Kroah-Hartman 2084ab4382d2SGreg Kroah-Hartman memset(&termios, 0, sizeof(struct ktermios)); 2085ab4382d2SGreg Kroah-Hartman 2086ba47f97aSJeffy Chen termios.c_cflag |= CREAD | HUPCL | CLOCAL; 2087ba47f97aSJeffy Chen tty_termios_encode_baud_rate(&termios, baud, baud); 2088ab4382d2SGreg Kroah-Hartman 2089ab4382d2SGreg Kroah-Hartman if (bits == 7) 2090ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CS7; 2091ab4382d2SGreg Kroah-Hartman else 2092ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CS8; 2093ab4382d2SGreg Kroah-Hartman 2094ab4382d2SGreg Kroah-Hartman switch (parity) { 2095ab4382d2SGreg Kroah-Hartman case 'o': case 'O': 2096ab4382d2SGreg Kroah-Hartman termios.c_cflag |= PARODD; 2097ab4382d2SGreg Kroah-Hartman /*fall through*/ 2098ab4382d2SGreg Kroah-Hartman case 'e': case 'E': 2099ab4382d2SGreg Kroah-Hartman termios.c_cflag |= PARENB; 2100ab4382d2SGreg Kroah-Hartman break; 2101ab4382d2SGreg Kroah-Hartman } 2102ab4382d2SGreg Kroah-Hartman 2103ab4382d2SGreg Kroah-Hartman if (flow == 'r') 2104ab4382d2SGreg Kroah-Hartman termios.c_cflag |= CRTSCTS; 2105ab4382d2SGreg Kroah-Hartman 2106ab4382d2SGreg Kroah-Hartman /* 2107ab4382d2SGreg Kroah-Hartman * some uarts on other side don't support no flow control. 2108ab4382d2SGreg Kroah-Hartman * So we set * DTR in host uart to make them happy 2109ab4382d2SGreg Kroah-Hartman */ 2110ab4382d2SGreg Kroah-Hartman port->mctrl |= TIOCM_DTR; 2111ab4382d2SGreg Kroah-Hartman 2112ab4382d2SGreg Kroah-Hartman port->ops->set_termios(port, &termios, &dummy); 2113ab4382d2SGreg Kroah-Hartman /* 2114ab4382d2SGreg Kroah-Hartman * Allow the setting of the UART parameters with a NULL console 2115ab4382d2SGreg Kroah-Hartman * too: 2116ab4382d2SGreg Kroah-Hartman */ 2117ab4382d2SGreg Kroah-Hartman if (co) 2118ab4382d2SGreg Kroah-Hartman co->cflag = termios.c_cflag; 2119ab4382d2SGreg Kroah-Hartman 2120ab4382d2SGreg Kroah-Hartman return 0; 2121ab4382d2SGreg Kroah-Hartman } 2122ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(uart_set_options); 2123ab4382d2SGreg Kroah-Hartman #endif /* CONFIG_SERIAL_CORE_CONSOLE */ 2124ab4382d2SGreg Kroah-Hartman 2125cf75525fSJiri Slaby /** 2126cf75525fSJiri Slaby * uart_change_pm - set power state of the port 2127cf75525fSJiri Slaby * 2128cf75525fSJiri Slaby * @state: port descriptor 2129cf75525fSJiri Slaby * @pm_state: new state 2130cf75525fSJiri Slaby * 2131cf75525fSJiri Slaby * Locking: port->mutex has to be held 2132cf75525fSJiri Slaby */ 21336f538fe3SLinus Walleij static void uart_change_pm(struct uart_state *state, 21346f538fe3SLinus Walleij enum uart_pm_state pm_state) 2135ab4382d2SGreg Kroah-Hartman { 21364047b371SPeter Hurley struct uart_port *port = uart_port_check(state); 2137ab4382d2SGreg Kroah-Hartman 2138ab4382d2SGreg Kroah-Hartman if (state->pm_state != pm_state) { 21394047b371SPeter Hurley if (port && port->ops->pm) 2140ab4382d2SGreg Kroah-Hartman port->ops->pm(port, pm_state, state->pm_state); 2141ab4382d2SGreg Kroah-Hartman state->pm_state = pm_state; 2142ab4382d2SGreg Kroah-Hartman } 2143ab4382d2SGreg Kroah-Hartman } 2144ab4382d2SGreg Kroah-Hartman 2145ab4382d2SGreg Kroah-Hartman struct uart_match { 2146ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2147ab4382d2SGreg Kroah-Hartman struct uart_driver *driver; 2148ab4382d2SGreg Kroah-Hartman }; 2149ab4382d2SGreg Kroah-Hartman 2150ab4382d2SGreg Kroah-Hartman static int serial_match_port(struct device *dev, void *data) 2151ab4382d2SGreg Kroah-Hartman { 2152ab4382d2SGreg Kroah-Hartman struct uart_match *match = data; 2153ab4382d2SGreg Kroah-Hartman struct tty_driver *tty_drv = match->driver->tty_driver; 2154ab4382d2SGreg Kroah-Hartman dev_t devt = MKDEV(tty_drv->major, tty_drv->minor_start) + 2155ab4382d2SGreg Kroah-Hartman match->port->line; 2156ab4382d2SGreg Kroah-Hartman 2157ab4382d2SGreg Kroah-Hartman return dev->devt == devt; /* Actually, only one tty per port */ 2158ab4382d2SGreg Kroah-Hartman } 2159ab4382d2SGreg Kroah-Hartman 2160ab4382d2SGreg Kroah-Hartman int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport) 2161ab4382d2SGreg Kroah-Hartman { 2162ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 2163ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2164ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 2165ab4382d2SGreg Kroah-Hartman struct uart_match match = {uport, drv}; 2166ab4382d2SGreg Kroah-Hartman 2167ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2168ab4382d2SGreg Kroah-Hartman 2169ab4382d2SGreg Kroah-Hartman tty_dev = device_find_child(uport->dev, &match, serial_match_port); 217088e2582eSLucas Stach if (tty_dev && device_may_wakeup(tty_dev)) { 2171aef3ad10SAndy Shevchenko enable_irq_wake(uport->irq); 2172ab4382d2SGreg Kroah-Hartman put_device(tty_dev); 2173ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2174ab4382d2SGreg Kroah-Hartman return 0; 2175ab4382d2SGreg Kroah-Hartman } 21765a65dcc0SFederico Vaga put_device(tty_dev); 21775a65dcc0SFederico Vaga 2178b164c972SPeter Hurley /* Nothing to do if the console is not suspending */ 2179b164c972SPeter Hurley if (!console_suspend_enabled && uart_console(uport)) 2180b164c972SPeter Hurley goto unlock; 2181b164c972SPeter Hurley 2182ab4382d2SGreg Kroah-Hartman uport->suspended = 1; 2183ab4382d2SGreg Kroah-Hartman 2184d41861caSPeter Hurley if (tty_port_initialized(port)) { 2185ab4382d2SGreg Kroah-Hartman const struct uart_ops *ops = uport->ops; 2186ab4382d2SGreg Kroah-Hartman int tries; 2187ab4382d2SGreg Kroah-Hartman 218880f02d54SPeter Hurley tty_port_set_suspended(port, 1); 2189d41861caSPeter Hurley tty_port_set_initialized(port, 0); 2190ab4382d2SGreg Kroah-Hartman 2191ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 2192ab4382d2SGreg Kroah-Hartman ops->stop_tx(uport); 2193ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, 0); 2194ab4382d2SGreg Kroah-Hartman ops->stop_rx(uport); 2195ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2196ab4382d2SGreg Kroah-Hartman 2197ab4382d2SGreg Kroah-Hartman /* 2198ab4382d2SGreg Kroah-Hartman * Wait for the transmitter to empty. 2199ab4382d2SGreg Kroah-Hartman */ 2200ab4382d2SGreg Kroah-Hartman for (tries = 3; !ops->tx_empty(uport) && tries; tries--) 2201ab4382d2SGreg Kroah-Hartman msleep(10); 2202ab4382d2SGreg Kroah-Hartman if (!tries) 2203cade3580SAndy Shevchenko dev_err(uport->dev, "%s: Unable to drain transmitter\n", 2204cade3580SAndy Shevchenko uport->name); 2205ab4382d2SGreg Kroah-Hartman 2206ab4382d2SGreg Kroah-Hartman ops->shutdown(uport); 2207ab4382d2SGreg Kroah-Hartman } 2208ab4382d2SGreg Kroah-Hartman 2209ab4382d2SGreg Kroah-Hartman /* 2210ab4382d2SGreg Kroah-Hartman * Disable the console device before suspending. 2211ab4382d2SGreg Kroah-Hartman */ 2212b164c972SPeter Hurley if (uart_console(uport)) 2213ab4382d2SGreg Kroah-Hartman console_stop(uport->cons); 2214ab4382d2SGreg Kroah-Hartman 22156f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_OFF); 2216b164c972SPeter Hurley unlock: 2217ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2218ab4382d2SGreg Kroah-Hartman 2219ab4382d2SGreg Kroah-Hartman return 0; 2220ab4382d2SGreg Kroah-Hartman } 2221ab4382d2SGreg Kroah-Hartman 2222ab4382d2SGreg Kroah-Hartman int uart_resume_port(struct uart_driver *drv, struct uart_port *uport) 2223ab4382d2SGreg Kroah-Hartman { 2224ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 2225ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2226ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 2227ab4382d2SGreg Kroah-Hartman struct uart_match match = {uport, drv}; 2228ab4382d2SGreg Kroah-Hartman struct ktermios termios; 2229ab4382d2SGreg Kroah-Hartman 2230ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2231ab4382d2SGreg Kroah-Hartman 2232ab4382d2SGreg Kroah-Hartman tty_dev = device_find_child(uport->dev, &match, serial_match_port); 2233ab4382d2SGreg Kroah-Hartman if (!uport->suspended && device_may_wakeup(tty_dev)) { 2234aef3ad10SAndy Shevchenko if (irqd_is_wakeup_set(irq_get_irq_data((uport->irq)))) 2235ab4382d2SGreg Kroah-Hartman disable_irq_wake(uport->irq); 22365a65dcc0SFederico Vaga put_device(tty_dev); 2237ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2238ab4382d2SGreg Kroah-Hartman return 0; 2239ab4382d2SGreg Kroah-Hartman } 22405a65dcc0SFederico Vaga put_device(tty_dev); 2241ab4382d2SGreg Kroah-Hartman uport->suspended = 0; 2242ab4382d2SGreg Kroah-Hartman 2243ab4382d2SGreg Kroah-Hartman /* 2244ab4382d2SGreg Kroah-Hartman * Re-enable the console device after suspending. 2245ab4382d2SGreg Kroah-Hartman */ 22465933a161SYin Kangkai if (uart_console(uport)) { 2247ab4382d2SGreg Kroah-Hartman /* 2248ab4382d2SGreg Kroah-Hartman * First try to use the console cflag setting. 2249ab4382d2SGreg Kroah-Hartman */ 2250ab4382d2SGreg Kroah-Hartman memset(&termios, 0, sizeof(struct ktermios)); 2251ab4382d2SGreg Kroah-Hartman termios.c_cflag = uport->cons->cflag; 2252ab4382d2SGreg Kroah-Hartman 2253ab4382d2SGreg Kroah-Hartman /* 2254ab4382d2SGreg Kroah-Hartman * If that's unset, use the tty termios setting. 2255ab4382d2SGreg Kroah-Hartman */ 2256adc8d746SAlan Cox if (port->tty && termios.c_cflag == 0) 2257adc8d746SAlan Cox termios = port->tty->termios; 2258ab4382d2SGreg Kroah-Hartman 225994abc56fSNing Jiang if (console_suspend_enabled) 22606f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2261ab4382d2SGreg Kroah-Hartman uport->ops->set_termios(uport, &termios, NULL); 22625933a161SYin Kangkai if (console_suspend_enabled) 2263ab4382d2SGreg Kroah-Hartman console_start(uport->cons); 2264ab4382d2SGreg Kroah-Hartman } 2265ab4382d2SGreg Kroah-Hartman 226680f02d54SPeter Hurley if (tty_port_suspended(port)) { 2267ab4382d2SGreg Kroah-Hartman const struct uart_ops *ops = uport->ops; 2268ab4382d2SGreg Kroah-Hartman int ret; 2269ab4382d2SGreg Kroah-Hartman 22706f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2271ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 2272ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, 0); 2273ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2274ab4382d2SGreg Kroah-Hartman if (console_suspend_enabled || !uart_console(uport)) { 2275ab4382d2SGreg Kroah-Hartman /* Protected by port mutex for now */ 2276ab4382d2SGreg Kroah-Hartman struct tty_struct *tty = port->tty; 2277ab4382d2SGreg Kroah-Hartman ret = ops->startup(uport); 2278ab4382d2SGreg Kroah-Hartman if (ret == 0) { 2279ab4382d2SGreg Kroah-Hartman if (tty) 2280ab4382d2SGreg Kroah-Hartman uart_change_speed(tty, state, NULL); 2281ab4382d2SGreg Kroah-Hartman spin_lock_irq(&uport->lock); 2282ab4382d2SGreg Kroah-Hartman ops->set_mctrl(uport, uport->mctrl); 2283ab4382d2SGreg Kroah-Hartman ops->start_tx(uport); 2284ab4382d2SGreg Kroah-Hartman spin_unlock_irq(&uport->lock); 2285d41861caSPeter Hurley tty_port_set_initialized(port, 1); 2286ab4382d2SGreg Kroah-Hartman } else { 2287ab4382d2SGreg Kroah-Hartman /* 2288ab4382d2SGreg Kroah-Hartman * Failed to resume - maybe hardware went away? 2289ab4382d2SGreg Kroah-Hartman * Clear the "initialized" flag so we won't try 2290ab4382d2SGreg Kroah-Hartman * to call the low level drivers shutdown method. 2291ab4382d2SGreg Kroah-Hartman */ 2292ab4382d2SGreg Kroah-Hartman uart_shutdown(tty, state); 2293ab4382d2SGreg Kroah-Hartman } 2294ab4382d2SGreg Kroah-Hartman } 2295ab4382d2SGreg Kroah-Hartman 229680f02d54SPeter Hurley tty_port_set_suspended(port, 0); 2297ab4382d2SGreg Kroah-Hartman } 2298ab4382d2SGreg Kroah-Hartman 2299ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2300ab4382d2SGreg Kroah-Hartman 2301ab4382d2SGreg Kroah-Hartman return 0; 2302ab4382d2SGreg Kroah-Hartman } 2303ab4382d2SGreg Kroah-Hartman 2304ab4382d2SGreg Kroah-Hartman static inline void 2305ab4382d2SGreg Kroah-Hartman uart_report_port(struct uart_driver *drv, struct uart_port *port) 2306ab4382d2SGreg Kroah-Hartman { 2307ab4382d2SGreg Kroah-Hartman char address[64]; 2308ab4382d2SGreg Kroah-Hartman 2309ab4382d2SGreg Kroah-Hartman switch (port->iotype) { 2310ab4382d2SGreg Kroah-Hartman case UPIO_PORT: 2311ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), "I/O 0x%lx", port->iobase); 2312ab4382d2SGreg Kroah-Hartman break; 2313ab4382d2SGreg Kroah-Hartman case UPIO_HUB6: 2314ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), 2315ab4382d2SGreg Kroah-Hartman "I/O 0x%lx offset 0x%x", port->iobase, port->hub6); 2316ab4382d2SGreg Kroah-Hartman break; 2317ab4382d2SGreg Kroah-Hartman case UPIO_MEM: 2318bd94c407SMasahiro Yamada case UPIO_MEM16: 2319ab4382d2SGreg Kroah-Hartman case UPIO_MEM32: 23203ffb1a81SKevin Cernekee case UPIO_MEM32BE: 2321ab4382d2SGreg Kroah-Hartman case UPIO_AU: 2322ab4382d2SGreg Kroah-Hartman case UPIO_TSI: 2323ab4382d2SGreg Kroah-Hartman snprintf(address, sizeof(address), 2324ab4382d2SGreg Kroah-Hartman "MMIO 0x%llx", (unsigned long long)port->mapbase); 2325ab4382d2SGreg Kroah-Hartman break; 2326ab4382d2SGreg Kroah-Hartman default: 2327ab4382d2SGreg Kroah-Hartman strlcpy(address, "*unknown*", sizeof(address)); 2328ab4382d2SGreg Kroah-Hartman break; 2329ab4382d2SGreg Kroah-Hartman } 2330ab4382d2SGreg Kroah-Hartman 2331cade3580SAndy Shevchenko pr_info("%s%s%s at %s (irq = %d, base_baud = %d) is a %s\n", 233268ed7e1cSJames Bottomley port->dev ? dev_name(port->dev) : "", 233368ed7e1cSJames Bottomley port->dev ? ": " : "", 2334cade3580SAndy Shevchenko port->name, 23357d12b976SKees Cook address, port->irq, port->uartclk / 16, uart_type(port)); 2336ab4382d2SGreg Kroah-Hartman } 2337ab4382d2SGreg Kroah-Hartman 2338ab4382d2SGreg Kroah-Hartman static void 2339ab4382d2SGreg Kroah-Hartman uart_configure_port(struct uart_driver *drv, struct uart_state *state, 2340ab4382d2SGreg Kroah-Hartman struct uart_port *port) 2341ab4382d2SGreg Kroah-Hartman { 2342ab4382d2SGreg Kroah-Hartman unsigned int flags; 2343ab4382d2SGreg Kroah-Hartman 2344ab4382d2SGreg Kroah-Hartman /* 2345ab4382d2SGreg Kroah-Hartman * If there isn't a port here, don't do anything further. 2346ab4382d2SGreg Kroah-Hartman */ 2347ab4382d2SGreg Kroah-Hartman if (!port->iobase && !port->mapbase && !port->membase) 2348ab4382d2SGreg Kroah-Hartman return; 2349ab4382d2SGreg Kroah-Hartman 2350ab4382d2SGreg Kroah-Hartman /* 2351ab4382d2SGreg Kroah-Hartman * Now do the auto configuration stuff. Note that config_port 2352ab4382d2SGreg Kroah-Hartman * is expected to claim the resources and map the port for us. 2353ab4382d2SGreg Kroah-Hartman */ 2354ab4382d2SGreg Kroah-Hartman flags = 0; 2355ab4382d2SGreg Kroah-Hartman if (port->flags & UPF_AUTO_IRQ) 2356ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_IRQ; 2357ab4382d2SGreg Kroah-Hartman if (port->flags & UPF_BOOT_AUTOCONF) { 2358ab4382d2SGreg Kroah-Hartman if (!(port->flags & UPF_FIXED_TYPE)) { 2359ab4382d2SGreg Kroah-Hartman port->type = PORT_UNKNOWN; 2360ab4382d2SGreg Kroah-Hartman flags |= UART_CONFIG_TYPE; 2361ab4382d2SGreg Kroah-Hartman } 2362ab4382d2SGreg Kroah-Hartman port->ops->config_port(port, flags); 2363ab4382d2SGreg Kroah-Hartman } 2364ab4382d2SGreg Kroah-Hartman 2365ab4382d2SGreg Kroah-Hartman if (port->type != PORT_UNKNOWN) { 2366ab4382d2SGreg Kroah-Hartman unsigned long flags; 2367ab4382d2SGreg Kroah-Hartman 2368ab4382d2SGreg Kroah-Hartman uart_report_port(drv, port); 2369ab4382d2SGreg Kroah-Hartman 2370ab4382d2SGreg Kroah-Hartman /* Power up port for set_mctrl() */ 23716f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_ON); 2372ab4382d2SGreg Kroah-Hartman 2373ab4382d2SGreg Kroah-Hartman /* 2374ab4382d2SGreg Kroah-Hartman * Ensure that the modem control lines are de-activated. 2375ab4382d2SGreg Kroah-Hartman * keep the DTR setting that is set in uart_set_options() 2376ab4382d2SGreg Kroah-Hartman * We probably don't need a spinlock around this, but 2377ab4382d2SGreg Kroah-Hartman */ 2378ab4382d2SGreg Kroah-Hartman spin_lock_irqsave(&port->lock, flags); 2379ab4382d2SGreg Kroah-Hartman port->ops->set_mctrl(port, port->mctrl & TIOCM_DTR); 2380ab4382d2SGreg Kroah-Hartman spin_unlock_irqrestore(&port->lock, flags); 2381ab4382d2SGreg Kroah-Hartman 2382ab4382d2SGreg Kroah-Hartman /* 2383ab4382d2SGreg Kroah-Hartman * If this driver supports console, and it hasn't been 2384ab4382d2SGreg Kroah-Hartman * successfully registered yet, try to re-register it. 2385ab4382d2SGreg Kroah-Hartman * It may be that the port was not available. 2386ab4382d2SGreg Kroah-Hartman */ 2387ab4382d2SGreg Kroah-Hartman if (port->cons && !(port->cons->flags & CON_ENABLED)) 2388ab4382d2SGreg Kroah-Hartman register_console(port->cons); 2389ab4382d2SGreg Kroah-Hartman 2390ab4382d2SGreg Kroah-Hartman /* 2391ab4382d2SGreg Kroah-Hartman * Power down all ports by default, except the 2392ab4382d2SGreg Kroah-Hartman * console if we have one. 2393ab4382d2SGreg Kroah-Hartman */ 2394ab4382d2SGreg Kroah-Hartman if (!uart_console(port)) 23956f538fe3SLinus Walleij uart_change_pm(state, UART_PM_STATE_OFF); 2396ab4382d2SGreg Kroah-Hartman } 2397ab4382d2SGreg Kroah-Hartman } 2398ab4382d2SGreg Kroah-Hartman 2399ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 2400ab4382d2SGreg Kroah-Hartman 2401ab4382d2SGreg Kroah-Hartman static int uart_poll_init(struct tty_driver *driver, int line, char *options) 2402ab4382d2SGreg Kroah-Hartman { 2403ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2404ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 240549c02304SPeter Hurley struct tty_port *tport; 2406ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2407ab4382d2SGreg Kroah-Hartman int baud = 9600; 2408ab4382d2SGreg Kroah-Hartman int bits = 8; 2409ab4382d2SGreg Kroah-Hartman int parity = 'n'; 2410ab4382d2SGreg Kroah-Hartman int flow = 'n'; 241149c02304SPeter Hurley int ret = 0; 2412ab4382d2SGreg Kroah-Hartman 241349c02304SPeter Hurley tport = &state->port; 241449c02304SPeter Hurley mutex_lock(&tport->mutex); 241549c02304SPeter Hurley 24164047b371SPeter Hurley port = uart_port_check(state); 24174047b371SPeter Hurley if (!port || !(port->ops->poll_get_char && port->ops->poll_put_char)) { 241849c02304SPeter Hurley ret = -1; 241949c02304SPeter Hurley goto out; 242049c02304SPeter Hurley } 2421ab4382d2SGreg Kroah-Hartman 2422c7f3e708SAnton Vorontsov if (port->ops->poll_init) { 2423c7f3e708SAnton Vorontsov /* 2424d41861caSPeter Hurley * We don't set initialized as we only initialized the hw, 2425d41861caSPeter Hurley * e.g. state->xmit is still uninitialized. 2426c7f3e708SAnton Vorontsov */ 2427d41861caSPeter Hurley if (!tty_port_initialized(tport)) 2428c7f3e708SAnton Vorontsov ret = port->ops->poll_init(port); 2429c7f3e708SAnton Vorontsov } 2430c7f3e708SAnton Vorontsov 243149c02304SPeter Hurley if (!ret && options) { 2432ab4382d2SGreg Kroah-Hartman uart_parse_options(options, &baud, &parity, &bits, &flow); 243349c02304SPeter Hurley ret = uart_set_options(port, NULL, baud, parity, bits, flow); 2434ab4382d2SGreg Kroah-Hartman } 243549c02304SPeter Hurley out: 243649c02304SPeter Hurley mutex_unlock(&tport->mutex); 243749c02304SPeter Hurley return ret; 2438ab4382d2SGreg Kroah-Hartman } 2439ab4382d2SGreg Kroah-Hartman 2440ab4382d2SGreg Kroah-Hartman static int uart_poll_get_char(struct tty_driver *driver, int line) 2441ab4382d2SGreg Kroah-Hartman { 2442ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2443ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2444ab4382d2SGreg Kroah-Hartman struct uart_port *port; 24459ed19428SPeter Hurley int ret = -1; 2446ab4382d2SGreg Kroah-Hartman 24479ed19428SPeter Hurley port = uart_port_ref(state); 2448ef510beaSAndy Shevchenko if (port) { 24499ed19428SPeter Hurley ret = port->ops->poll_get_char(port); 24509ed19428SPeter Hurley uart_port_deref(port); 24519ed19428SPeter Hurley } 245222077b09SJiri Slaby 24539ed19428SPeter Hurley return ret; 2454ab4382d2SGreg Kroah-Hartman } 2455ab4382d2SGreg Kroah-Hartman 2456ab4382d2SGreg Kroah-Hartman static void uart_poll_put_char(struct tty_driver *driver, int line, char ch) 2457ab4382d2SGreg Kroah-Hartman { 2458ab4382d2SGreg Kroah-Hartman struct uart_driver *drv = driver->driver_state; 2459ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + line; 2460ab4382d2SGreg Kroah-Hartman struct uart_port *port; 2461ab4382d2SGreg Kroah-Hartman 24629ed19428SPeter Hurley port = uart_port_ref(state); 24639ed19428SPeter Hurley if (!port) 24649ed19428SPeter Hurley return; 2465c7d44a02SDoug Anderson 2466c7d44a02SDoug Anderson if (ch == '\n') 2467c7d44a02SDoug Anderson port->ops->poll_put_char(port, '\r'); 2468ab4382d2SGreg Kroah-Hartman port->ops->poll_put_char(port, ch); 24699ed19428SPeter Hurley uart_port_deref(port); 2470ab4382d2SGreg Kroah-Hartman } 2471ab4382d2SGreg Kroah-Hartman #endif 2472ab4382d2SGreg Kroah-Hartman 2473ab4382d2SGreg Kroah-Hartman static const struct tty_operations uart_ops = { 24744cdd17baSJiri Slaby .install = uart_install, 2475ab4382d2SGreg Kroah-Hartman .open = uart_open, 2476ab4382d2SGreg Kroah-Hartman .close = uart_close, 2477ab4382d2SGreg Kroah-Hartman .write = uart_write, 2478ab4382d2SGreg Kroah-Hartman .put_char = uart_put_char, 2479ab4382d2SGreg Kroah-Hartman .flush_chars = uart_flush_chars, 2480ab4382d2SGreg Kroah-Hartman .write_room = uart_write_room, 2481ab4382d2SGreg Kroah-Hartman .chars_in_buffer= uart_chars_in_buffer, 2482ab4382d2SGreg Kroah-Hartman .flush_buffer = uart_flush_buffer, 2483ab4382d2SGreg Kroah-Hartman .ioctl = uart_ioctl, 2484ab4382d2SGreg Kroah-Hartman .throttle = uart_throttle, 2485ab4382d2SGreg Kroah-Hartman .unthrottle = uart_unthrottle, 2486ab4382d2SGreg Kroah-Hartman .send_xchar = uart_send_xchar, 2487ab4382d2SGreg Kroah-Hartman .set_termios = uart_set_termios, 2488ab4382d2SGreg Kroah-Hartman .set_ldisc = uart_set_ldisc, 2489ab4382d2SGreg Kroah-Hartman .stop = uart_stop, 2490ab4382d2SGreg Kroah-Hartman .start = uart_start, 2491ab4382d2SGreg Kroah-Hartman .hangup = uart_hangup, 2492ab4382d2SGreg Kroah-Hartman .break_ctl = uart_break_ctl, 2493ab4382d2SGreg Kroah-Hartman .wait_until_sent= uart_wait_until_sent, 2494ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_PROC_FS 24958a8dcabfSChristoph Hellwig .proc_show = uart_proc_show, 2496ab4382d2SGreg Kroah-Hartman #endif 2497ab4382d2SGreg Kroah-Hartman .tiocmget = uart_tiocmget, 2498ab4382d2SGreg Kroah-Hartman .tiocmset = uart_tiocmset, 24995099d234SAl Viro .set_serial = uart_set_info_user, 25005099d234SAl Viro .get_serial = uart_get_info_user, 2501ab4382d2SGreg Kroah-Hartman .get_icount = uart_get_icount, 2502ab4382d2SGreg Kroah-Hartman #ifdef CONFIG_CONSOLE_POLL 2503ab4382d2SGreg Kroah-Hartman .poll_init = uart_poll_init, 2504ab4382d2SGreg Kroah-Hartman .poll_get_char = uart_poll_get_char, 2505ab4382d2SGreg Kroah-Hartman .poll_put_char = uart_poll_put_char, 2506ab4382d2SGreg Kroah-Hartman #endif 2507ab4382d2SGreg Kroah-Hartman }; 2508ab4382d2SGreg Kroah-Hartman 2509ab4382d2SGreg Kroah-Hartman static const struct tty_port_operations uart_port_ops = { 2510ab4382d2SGreg Kroah-Hartman .carrier_raised = uart_carrier_raised, 2511ab4382d2SGreg Kroah-Hartman .dtr_rts = uart_dtr_rts, 2512b3b57646SRob Herring .activate = uart_port_activate, 2513761ed4a9SRob Herring .shutdown = uart_tty_port_shutdown, 2514ab4382d2SGreg Kroah-Hartman }; 2515ab4382d2SGreg Kroah-Hartman 2516ab4382d2SGreg Kroah-Hartman /** 2517ab4382d2SGreg Kroah-Hartman * uart_register_driver - register a driver with the uart core layer 2518ab4382d2SGreg Kroah-Hartman * @drv: low level driver structure 2519ab4382d2SGreg Kroah-Hartman * 2520ab4382d2SGreg Kroah-Hartman * Register a uart driver with the core driver. We in turn register 2521ab4382d2SGreg Kroah-Hartman * with the tty layer, and initialise the core driver per-port state. 2522ab4382d2SGreg Kroah-Hartman * 2523ab4382d2SGreg Kroah-Hartman * We have a proc file in /proc/tty/driver which is named after the 2524ab4382d2SGreg Kroah-Hartman * normal driver. 2525ab4382d2SGreg Kroah-Hartman * 2526ab4382d2SGreg Kroah-Hartman * drv->port should be NULL, and the per-port structures should be 2527ab4382d2SGreg Kroah-Hartman * registered using uart_add_one_port after this call has succeeded. 2528ab4382d2SGreg Kroah-Hartman */ 2529ab4382d2SGreg Kroah-Hartman int uart_register_driver(struct uart_driver *drv) 2530ab4382d2SGreg Kroah-Hartman { 2531ab4382d2SGreg Kroah-Hartman struct tty_driver *normal; 2532050dfc09SSergey Organov int i, retval = -ENOMEM; 2533ab4382d2SGreg Kroah-Hartman 2534ab4382d2SGreg Kroah-Hartman BUG_ON(drv->state); 2535ab4382d2SGreg Kroah-Hartman 2536ab4382d2SGreg Kroah-Hartman /* 2537ab4382d2SGreg Kroah-Hartman * Maybe we should be using a slab cache for this, especially if 2538ab4382d2SGreg Kroah-Hartman * we have a large number of ports to handle. 2539ab4382d2SGreg Kroah-Hartman */ 25406396bb22SKees Cook drv->state = kcalloc(drv->nr, sizeof(struct uart_state), GFP_KERNEL); 2541ab4382d2SGreg Kroah-Hartman if (!drv->state) 2542ab4382d2SGreg Kroah-Hartman goto out; 2543ab4382d2SGreg Kroah-Hartman 2544ab4382d2SGreg Kroah-Hartman normal = alloc_tty_driver(drv->nr); 2545ab4382d2SGreg Kroah-Hartman if (!normal) 2546ab4382d2SGreg Kroah-Hartman goto out_kfree; 2547ab4382d2SGreg Kroah-Hartman 2548ab4382d2SGreg Kroah-Hartman drv->tty_driver = normal; 2549ab4382d2SGreg Kroah-Hartman 2550ab4382d2SGreg Kroah-Hartman normal->driver_name = drv->driver_name; 2551ab4382d2SGreg Kroah-Hartman normal->name = drv->dev_name; 2552ab4382d2SGreg Kroah-Hartman normal->major = drv->major; 2553ab4382d2SGreg Kroah-Hartman normal->minor_start = drv->minor; 2554ab4382d2SGreg Kroah-Hartman normal->type = TTY_DRIVER_TYPE_SERIAL; 2555ab4382d2SGreg Kroah-Hartman normal->subtype = SERIAL_TYPE_NORMAL; 2556ab4382d2SGreg Kroah-Hartman normal->init_termios = tty_std_termios; 2557ab4382d2SGreg Kroah-Hartman normal->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; 2558ab4382d2SGreg Kroah-Hartman normal->init_termios.c_ispeed = normal->init_termios.c_ospeed = 9600; 2559ab4382d2SGreg Kroah-Hartman normal->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; 2560ab4382d2SGreg Kroah-Hartman normal->driver_state = drv; 2561ab4382d2SGreg Kroah-Hartman tty_set_operations(normal, &uart_ops); 2562ab4382d2SGreg Kroah-Hartman 2563ab4382d2SGreg Kroah-Hartman /* 2564ab4382d2SGreg Kroah-Hartman * Initialise the UART state(s). 2565ab4382d2SGreg Kroah-Hartman */ 2566ab4382d2SGreg Kroah-Hartman for (i = 0; i < drv->nr; i++) { 2567ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + i; 2568ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 2569ab4382d2SGreg Kroah-Hartman 2570ab4382d2SGreg Kroah-Hartman tty_port_init(port); 2571ab4382d2SGreg Kroah-Hartman port->ops = &uart_port_ops; 2572ab4382d2SGreg Kroah-Hartman } 2573ab4382d2SGreg Kroah-Hartman 2574ab4382d2SGreg Kroah-Hartman retval = tty_register_driver(normal); 2575ab4382d2SGreg Kroah-Hartman if (retval >= 0) 2576ab4382d2SGreg Kroah-Hartman return retval; 2577ab4382d2SGreg Kroah-Hartman 2578191c5f10SJiri Slaby for (i = 0; i < drv->nr; i++) 2579191c5f10SJiri Slaby tty_port_destroy(&drv->state[i].port); 2580ab4382d2SGreg Kroah-Hartman put_tty_driver(normal); 2581ab4382d2SGreg Kroah-Hartman out_kfree: 2582ab4382d2SGreg Kroah-Hartman kfree(drv->state); 2583ab4382d2SGreg Kroah-Hartman out: 2584050dfc09SSergey Organov return retval; 2585ab4382d2SGreg Kroah-Hartman } 2586ab4382d2SGreg Kroah-Hartman 2587ab4382d2SGreg Kroah-Hartman /** 2588ab4382d2SGreg Kroah-Hartman * uart_unregister_driver - remove a driver from the uart core layer 2589ab4382d2SGreg Kroah-Hartman * @drv: low level driver structure 2590ab4382d2SGreg Kroah-Hartman * 2591ab4382d2SGreg Kroah-Hartman * Remove all references to a driver from the core driver. The low 2592ab4382d2SGreg Kroah-Hartman * level driver must have removed all its ports via the 2593ab4382d2SGreg Kroah-Hartman * uart_remove_one_port() if it registered them with uart_add_one_port(). 2594ab4382d2SGreg Kroah-Hartman * (ie, drv->port == NULL) 2595ab4382d2SGreg Kroah-Hartman */ 2596ab4382d2SGreg Kroah-Hartman void uart_unregister_driver(struct uart_driver *drv) 2597ab4382d2SGreg Kroah-Hartman { 2598ab4382d2SGreg Kroah-Hartman struct tty_driver *p = drv->tty_driver; 2599191c5f10SJiri Slaby unsigned int i; 2600191c5f10SJiri Slaby 2601ab4382d2SGreg Kroah-Hartman tty_unregister_driver(p); 2602ab4382d2SGreg Kroah-Hartman put_tty_driver(p); 2603191c5f10SJiri Slaby for (i = 0; i < drv->nr; i++) 2604191c5f10SJiri Slaby tty_port_destroy(&drv->state[i].port); 2605ab4382d2SGreg Kroah-Hartman kfree(drv->state); 26061e66cdedSAlan Cox drv->state = NULL; 2607ab4382d2SGreg Kroah-Hartman drv->tty_driver = NULL; 2608ab4382d2SGreg Kroah-Hartman } 2609ab4382d2SGreg Kroah-Hartman 2610ab4382d2SGreg Kroah-Hartman struct tty_driver *uart_console_device(struct console *co, int *index) 2611ab4382d2SGreg Kroah-Hartman { 2612ab4382d2SGreg Kroah-Hartman struct uart_driver *p = co->data; 2613ab4382d2SGreg Kroah-Hartman *index = co->index; 2614ab4382d2SGreg Kroah-Hartman return p->tty_driver; 2615ab4382d2SGreg Kroah-Hartman } 2616488f49acSJohn Stultz EXPORT_SYMBOL_GPL(uart_console_device); 2617ab4382d2SGreg Kroah-Hartman 2618143c02c8SAndy Shevchenko static ssize_t uartclk_show(struct device *dev, 26196915c0e4STomas Hlavacek struct device_attribute *attr, char *buf) 26206915c0e4STomas Hlavacek { 2621bebe73e3SAlan Cox struct serial_struct tmp; 26226915c0e4STomas Hlavacek struct tty_port *port = dev_get_drvdata(dev); 2623b1b79916STomas Hlavacek 26249f109694SAlan Cox uart_get_info(port, &tmp); 2625bebe73e3SAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.baud_base * 16); 26266915c0e4STomas Hlavacek } 26276915c0e4STomas Hlavacek 2628143c02c8SAndy Shevchenko static ssize_t type_show(struct device *dev, 2629373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2630373bac4cSAlan Cox { 2631373bac4cSAlan Cox struct serial_struct tmp; 2632373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2633373bac4cSAlan Cox 2634373bac4cSAlan Cox uart_get_info(port, &tmp); 2635373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.type); 2636373bac4cSAlan Cox } 2637143c02c8SAndy Shevchenko 2638143c02c8SAndy Shevchenko static ssize_t line_show(struct device *dev, 2639373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2640373bac4cSAlan Cox { 2641373bac4cSAlan Cox struct serial_struct tmp; 2642373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2643373bac4cSAlan Cox 2644373bac4cSAlan Cox uart_get_info(port, &tmp); 2645373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.line); 2646373bac4cSAlan Cox } 2647373bac4cSAlan Cox 2648143c02c8SAndy Shevchenko static ssize_t port_show(struct device *dev, 2649373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2650373bac4cSAlan Cox { 2651373bac4cSAlan Cox struct serial_struct tmp; 2652373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2653fd985e1dSAndrew Morton unsigned long ioaddr; 2654373bac4cSAlan Cox 2655373bac4cSAlan Cox uart_get_info(port, &tmp); 2656fd985e1dSAndrew Morton ioaddr = tmp.port; 2657fd985e1dSAndrew Morton if (HIGH_BITS_OFFSET) 2658fd985e1dSAndrew Morton ioaddr |= (unsigned long)tmp.port_high << HIGH_BITS_OFFSET; 2659fd985e1dSAndrew Morton return snprintf(buf, PAGE_SIZE, "0x%lX\n", ioaddr); 2660373bac4cSAlan Cox } 2661373bac4cSAlan Cox 2662143c02c8SAndy Shevchenko static ssize_t irq_show(struct device *dev, 2663373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2664373bac4cSAlan Cox { 2665373bac4cSAlan Cox struct serial_struct tmp; 2666373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2667373bac4cSAlan Cox 2668373bac4cSAlan Cox uart_get_info(port, &tmp); 2669373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.irq); 2670373bac4cSAlan Cox } 2671373bac4cSAlan Cox 2672143c02c8SAndy Shevchenko static ssize_t flags_show(struct device *dev, 2673373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2674373bac4cSAlan Cox { 2675373bac4cSAlan Cox struct serial_struct tmp; 2676373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2677373bac4cSAlan Cox 2678373bac4cSAlan Cox uart_get_info(port, &tmp); 2679373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "0x%X\n", tmp.flags); 2680373bac4cSAlan Cox } 2681373bac4cSAlan Cox 2682143c02c8SAndy Shevchenko static ssize_t xmit_fifo_size_show(struct device *dev, 2683373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2684373bac4cSAlan Cox { 2685373bac4cSAlan Cox struct serial_struct tmp; 2686373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2687373bac4cSAlan Cox 2688373bac4cSAlan Cox uart_get_info(port, &tmp); 2689373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.xmit_fifo_size); 2690373bac4cSAlan Cox } 2691373bac4cSAlan Cox 2692143c02c8SAndy Shevchenko static ssize_t close_delay_show(struct device *dev, 2693373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2694373bac4cSAlan Cox { 2695373bac4cSAlan Cox struct serial_struct tmp; 2696373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2697373bac4cSAlan Cox 2698373bac4cSAlan Cox uart_get_info(port, &tmp); 2699373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.close_delay); 2700373bac4cSAlan Cox } 2701373bac4cSAlan Cox 2702143c02c8SAndy Shevchenko static ssize_t closing_wait_show(struct device *dev, 2703373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2704373bac4cSAlan Cox { 2705373bac4cSAlan Cox struct serial_struct tmp; 2706373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2707373bac4cSAlan Cox 2708373bac4cSAlan Cox uart_get_info(port, &tmp); 2709373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.closing_wait); 2710373bac4cSAlan Cox } 2711373bac4cSAlan Cox 2712143c02c8SAndy Shevchenko static ssize_t custom_divisor_show(struct device *dev, 2713373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2714373bac4cSAlan Cox { 2715373bac4cSAlan Cox struct serial_struct tmp; 2716373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2717373bac4cSAlan Cox 2718373bac4cSAlan Cox uart_get_info(port, &tmp); 2719373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.custom_divisor); 2720373bac4cSAlan Cox } 2721373bac4cSAlan Cox 2722143c02c8SAndy Shevchenko static ssize_t io_type_show(struct device *dev, 2723373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2724373bac4cSAlan Cox { 2725373bac4cSAlan Cox struct serial_struct tmp; 2726373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2727373bac4cSAlan Cox 2728373bac4cSAlan Cox uart_get_info(port, &tmp); 2729373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.io_type); 2730373bac4cSAlan Cox } 2731373bac4cSAlan Cox 2732143c02c8SAndy Shevchenko static ssize_t iomem_base_show(struct device *dev, 2733373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2734373bac4cSAlan Cox { 2735373bac4cSAlan Cox struct serial_struct tmp; 2736373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2737373bac4cSAlan Cox 2738373bac4cSAlan Cox uart_get_info(port, &tmp); 2739373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "0x%lX\n", (unsigned long)tmp.iomem_base); 2740373bac4cSAlan Cox } 2741373bac4cSAlan Cox 2742143c02c8SAndy Shevchenko static ssize_t iomem_reg_shift_show(struct device *dev, 2743373bac4cSAlan Cox struct device_attribute *attr, char *buf) 2744373bac4cSAlan Cox { 2745373bac4cSAlan Cox struct serial_struct tmp; 2746373bac4cSAlan Cox struct tty_port *port = dev_get_drvdata(dev); 2747373bac4cSAlan Cox 2748373bac4cSAlan Cox uart_get_info(port, &tmp); 2749373bac4cSAlan Cox return snprintf(buf, PAGE_SIZE, "%d\n", tmp.iomem_reg_shift); 2750373bac4cSAlan Cox } 2751373bac4cSAlan Cox 2752a3cb39d2SAndy Shevchenko static ssize_t console_show(struct device *dev, 2753a3cb39d2SAndy Shevchenko struct device_attribute *attr, char *buf) 2754a3cb39d2SAndy Shevchenko { 2755a3cb39d2SAndy Shevchenko struct tty_port *port = dev_get_drvdata(dev); 2756a3cb39d2SAndy Shevchenko struct uart_state *state = container_of(port, struct uart_state, port); 2757a3cb39d2SAndy Shevchenko struct uart_port *uport; 2758a3cb39d2SAndy Shevchenko bool console = false; 2759a3cb39d2SAndy Shevchenko 2760a3cb39d2SAndy Shevchenko mutex_lock(&port->mutex); 2761a3cb39d2SAndy Shevchenko uport = uart_port_check(state); 2762a3cb39d2SAndy Shevchenko if (uport) 2763a3cb39d2SAndy Shevchenko console = uart_console_enabled(uport); 2764a3cb39d2SAndy Shevchenko mutex_unlock(&port->mutex); 2765a3cb39d2SAndy Shevchenko 2766a3cb39d2SAndy Shevchenko return sprintf(buf, "%c\n", console ? 'Y' : 'N'); 2767a3cb39d2SAndy Shevchenko } 2768a3cb39d2SAndy Shevchenko 2769a3cb39d2SAndy Shevchenko static ssize_t console_store(struct device *dev, 2770a3cb39d2SAndy Shevchenko struct device_attribute *attr, const char *buf, size_t count) 2771a3cb39d2SAndy Shevchenko { 2772a3cb39d2SAndy Shevchenko struct tty_port *port = dev_get_drvdata(dev); 2773a3cb39d2SAndy Shevchenko struct uart_state *state = container_of(port, struct uart_state, port); 2774a3cb39d2SAndy Shevchenko struct uart_port *uport; 2775a3cb39d2SAndy Shevchenko bool oldconsole, newconsole; 2776a3cb39d2SAndy Shevchenko int ret; 2777a3cb39d2SAndy Shevchenko 2778a3cb39d2SAndy Shevchenko ret = kstrtobool(buf, &newconsole); 2779a3cb39d2SAndy Shevchenko if (ret) 2780a3cb39d2SAndy Shevchenko return ret; 2781a3cb39d2SAndy Shevchenko 2782a3cb39d2SAndy Shevchenko mutex_lock(&port->mutex); 2783a3cb39d2SAndy Shevchenko uport = uart_port_check(state); 2784a3cb39d2SAndy Shevchenko if (uport) { 2785a3cb39d2SAndy Shevchenko oldconsole = uart_console_enabled(uport); 2786a3cb39d2SAndy Shevchenko if (oldconsole && !newconsole) { 2787a3cb39d2SAndy Shevchenko ret = unregister_console(uport->cons); 2788a3cb39d2SAndy Shevchenko } else if (!oldconsole && newconsole) { 2789a3cb39d2SAndy Shevchenko if (uart_console(uport)) 2790a3cb39d2SAndy Shevchenko register_console(uport->cons); 2791a3cb39d2SAndy Shevchenko else 2792a3cb39d2SAndy Shevchenko ret = -ENOENT; 2793a3cb39d2SAndy Shevchenko } 2794a3cb39d2SAndy Shevchenko } else { 2795a3cb39d2SAndy Shevchenko ret = -ENXIO; 2796a3cb39d2SAndy Shevchenko } 2797a3cb39d2SAndy Shevchenko mutex_unlock(&port->mutex); 2798a3cb39d2SAndy Shevchenko 2799a3cb39d2SAndy Shevchenko return ret < 0 ? ret : count; 2800a3cb39d2SAndy Shevchenko } 2801a3cb39d2SAndy Shevchenko 2802143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(uartclk); 2803143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(type); 2804143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(line); 2805143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(port); 2806143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(irq); 2807143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(flags); 2808143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(xmit_fifo_size); 2809143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(close_delay); 2810143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(closing_wait); 2811143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(custom_divisor); 2812143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(io_type); 2813143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(iomem_base); 2814143c02c8SAndy Shevchenko static DEVICE_ATTR_RO(iomem_reg_shift); 2815a3cb39d2SAndy Shevchenko static DEVICE_ATTR_RW(console); 28166915c0e4STomas Hlavacek 28176915c0e4STomas Hlavacek static struct attribute *tty_dev_attrs[] = { 2818143c02c8SAndy Shevchenko &dev_attr_uartclk.attr, 2819373bac4cSAlan Cox &dev_attr_type.attr, 2820373bac4cSAlan Cox &dev_attr_line.attr, 2821373bac4cSAlan Cox &dev_attr_port.attr, 2822373bac4cSAlan Cox &dev_attr_irq.attr, 2823373bac4cSAlan Cox &dev_attr_flags.attr, 2824373bac4cSAlan Cox &dev_attr_xmit_fifo_size.attr, 2825373bac4cSAlan Cox &dev_attr_close_delay.attr, 2826373bac4cSAlan Cox &dev_attr_closing_wait.attr, 2827373bac4cSAlan Cox &dev_attr_custom_divisor.attr, 2828373bac4cSAlan Cox &dev_attr_io_type.attr, 2829373bac4cSAlan Cox &dev_attr_iomem_base.attr, 2830373bac4cSAlan Cox &dev_attr_iomem_reg_shift.attr, 2831a3cb39d2SAndy Shevchenko &dev_attr_console.attr, 2832a3cb39d2SAndy Shevchenko NULL 28336915c0e4STomas Hlavacek }; 28346915c0e4STomas Hlavacek 2835b1b79916STomas Hlavacek static const struct attribute_group tty_dev_attr_group = { 28366915c0e4STomas Hlavacek .attrs = tty_dev_attrs, 28376915c0e4STomas Hlavacek }; 28386915c0e4STomas Hlavacek 2839ab4382d2SGreg Kroah-Hartman /** 2840ab4382d2SGreg Kroah-Hartman * uart_add_one_port - attach a driver-defined port structure 2841ab4382d2SGreg Kroah-Hartman * @drv: pointer to the uart low level driver structure for this port 2842ab4382d2SGreg Kroah-Hartman * @uport: uart port structure to use for this port. 2843ab4382d2SGreg Kroah-Hartman * 2844ab4382d2SGreg Kroah-Hartman * This allows the driver to register its own uart_port structure 2845ab4382d2SGreg Kroah-Hartman * with the core driver. The main purpose is to allow the low 2846ab4382d2SGreg Kroah-Hartman * level uart drivers to expand uart_port, rather than having yet 2847ab4382d2SGreg Kroah-Hartman * more levels of structures. 2848ab4382d2SGreg Kroah-Hartman */ 2849ab4382d2SGreg Kroah-Hartman int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport) 2850ab4382d2SGreg Kroah-Hartman { 2851ab4382d2SGreg Kroah-Hartman struct uart_state *state; 2852ab4382d2SGreg Kroah-Hartman struct tty_port *port; 2853ab4382d2SGreg Kroah-Hartman int ret = 0; 2854ab4382d2SGreg Kroah-Hartman struct device *tty_dev; 2855266dcff0SGreg Kroah-Hartman int num_groups; 2856ab4382d2SGreg Kroah-Hartman 2857ab4382d2SGreg Kroah-Hartman BUG_ON(in_interrupt()); 2858ab4382d2SGreg Kroah-Hartman 2859ab4382d2SGreg Kroah-Hartman if (uport->line >= drv->nr) 2860ab4382d2SGreg Kroah-Hartman return -EINVAL; 2861ab4382d2SGreg Kroah-Hartman 2862ab4382d2SGreg Kroah-Hartman state = drv->state + uport->line; 2863ab4382d2SGreg Kroah-Hartman port = &state->port; 2864ab4382d2SGreg Kroah-Hartman 2865ab4382d2SGreg Kroah-Hartman mutex_lock(&port_mutex); 2866ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 2867ab4382d2SGreg Kroah-Hartman if (state->uart_port) { 2868ab4382d2SGreg Kroah-Hartman ret = -EINVAL; 2869ab4382d2SGreg Kroah-Hartman goto out; 2870ab4382d2SGreg Kroah-Hartman } 2871ab4382d2SGreg Kroah-Hartman 28722b702b9bSPeter Hurley /* Link the port to the driver state table and vice versa */ 28739ed19428SPeter Hurley atomic_set(&state->refcount, 1); 28749ed19428SPeter Hurley init_waitqueue_head(&state->remove_wait); 2875ab4382d2SGreg Kroah-Hartman state->uart_port = uport; 2876ab4382d2SGreg Kroah-Hartman uport->state = state; 2877ab4382d2SGreg Kroah-Hartman 28782b702b9bSPeter Hurley state->pm_state = UART_PM_STATE_UNDEFINED; 28792b702b9bSPeter Hurley uport->cons = drv->cons; 2880959801feSPeter Hurley uport->minor = drv->tty_driver->minor_start + uport->line; 2881f7048b15SVignesh R uport->name = kasprintf(GFP_KERNEL, "%s%d", drv->dev_name, 2882f7048b15SVignesh R drv->tty_driver->name_base + uport->line); 2883f7048b15SVignesh R if (!uport->name) { 2884f7048b15SVignesh R ret = -ENOMEM; 2885f7048b15SVignesh R goto out; 2886f7048b15SVignesh R } 28872b702b9bSPeter Hurley 2888d2403cadSAndy Shevchenko uart_port_spin_lock_init(uport); 2889d2403cadSAndy Shevchenko 2890a208ffd2SGrant Likely if (uport->cons && uport->dev) 2891dd8b7a1dSMichal Simek of_console_check(uport->dev->of_node, uport->cons->name, uport->line); 2892ab4382d2SGreg Kroah-Hartman 2893fb2b9001SSudip Mukherjee tty_port_link_device(port, drv->tty_driver, uport->line); 2894ab4382d2SGreg Kroah-Hartman uart_configure_port(drv, state, uport); 2895ab4382d2SGreg Kroah-Hartman 28964dda864dSGeert Uytterhoeven port->console = uart_console(uport); 28974dda864dSGeert Uytterhoeven 2898266dcff0SGreg Kroah-Hartman num_groups = 2; 2899266dcff0SGreg Kroah-Hartman if (uport->attr_group) 2900266dcff0SGreg Kroah-Hartman num_groups++; 2901266dcff0SGreg Kroah-Hartman 2902c2b703b8SYoshihiro YUNOMAE uport->tty_groups = kcalloc(num_groups, sizeof(*uport->tty_groups), 2903266dcff0SGreg Kroah-Hartman GFP_KERNEL); 2904266dcff0SGreg Kroah-Hartman if (!uport->tty_groups) { 2905266dcff0SGreg Kroah-Hartman ret = -ENOMEM; 2906266dcff0SGreg Kroah-Hartman goto out; 2907266dcff0SGreg Kroah-Hartman } 2908266dcff0SGreg Kroah-Hartman uport->tty_groups[0] = &tty_dev_attr_group; 2909266dcff0SGreg Kroah-Hartman if (uport->attr_group) 2910266dcff0SGreg Kroah-Hartman uport->tty_groups[1] = uport->attr_group; 2911266dcff0SGreg Kroah-Hartman 2912ab4382d2SGreg Kroah-Hartman /* 2913ab4382d2SGreg Kroah-Hartman * Register the port whether it's detected or not. This allows 2914015355b7SGeert Uytterhoeven * setserial to be used to alter this port's parameters. 2915ab4382d2SGreg Kroah-Hartman */ 2916da4c2799SJohan Hovold tty_dev = tty_port_register_device_attr_serdev(port, drv->tty_driver, 2917266dcff0SGreg Kroah-Hartman uport->line, uport->dev, port, uport->tty_groups); 2918b289c496SChengguang Xu if (!IS_ERR(tty_dev)) { 291977359835SSimon Glass device_set_wakeup_capable(tty_dev, 1); 292077359835SSimon Glass } else { 29212f2dafe7SSudip Mukherjee dev_err(uport->dev, "Cannot register tty device on line %d\n", 2922ab4382d2SGreg Kroah-Hartman uport->line); 292377359835SSimon Glass } 2924ab4382d2SGreg Kroah-Hartman 2925ab4382d2SGreg Kroah-Hartman /* 2926ab4382d2SGreg Kroah-Hartman * Ensure UPF_DEAD is not set. 2927ab4382d2SGreg Kroah-Hartman */ 2928ab4382d2SGreg Kroah-Hartman uport->flags &= ~UPF_DEAD; 2929ab4382d2SGreg Kroah-Hartman 2930ab4382d2SGreg Kroah-Hartman out: 2931ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2932ab4382d2SGreg Kroah-Hartman mutex_unlock(&port_mutex); 2933ab4382d2SGreg Kroah-Hartman 2934ab4382d2SGreg Kroah-Hartman return ret; 2935ab4382d2SGreg Kroah-Hartman } 2936ab4382d2SGreg Kroah-Hartman 2937ab4382d2SGreg Kroah-Hartman /** 2938ab4382d2SGreg Kroah-Hartman * uart_remove_one_port - detach a driver defined port structure 2939ab4382d2SGreg Kroah-Hartman * @drv: pointer to the uart low level driver structure for this port 2940ab4382d2SGreg Kroah-Hartman * @uport: uart port structure for this port 2941ab4382d2SGreg Kroah-Hartman * 2942ab4382d2SGreg Kroah-Hartman * This unhooks (and hangs up) the specified port structure from the 2943ab4382d2SGreg Kroah-Hartman * core driver. No further calls will be made to the low-level code 2944ab4382d2SGreg Kroah-Hartman * for this port. 2945ab4382d2SGreg Kroah-Hartman */ 2946ab4382d2SGreg Kroah-Hartman int uart_remove_one_port(struct uart_driver *drv, struct uart_port *uport) 2947ab4382d2SGreg Kroah-Hartman { 2948ab4382d2SGreg Kroah-Hartman struct uart_state *state = drv->state + uport->line; 2949ab4382d2SGreg Kroah-Hartman struct tty_port *port = &state->port; 29504047b371SPeter Hurley struct uart_port *uart_port; 29514c6d5b4dSGeert Uytterhoeven struct tty_struct *tty; 2952b342dd51SChen Gang int ret = 0; 2953ab4382d2SGreg Kroah-Hartman 2954ab4382d2SGreg Kroah-Hartman BUG_ON(in_interrupt()); 2955ab4382d2SGreg Kroah-Hartman 2956ab4382d2SGreg Kroah-Hartman mutex_lock(&port_mutex); 2957ab4382d2SGreg Kroah-Hartman 2958ab4382d2SGreg Kroah-Hartman /* 2959ab4382d2SGreg Kroah-Hartman * Mark the port "dead" - this prevents any opens from 2960ab4382d2SGreg Kroah-Hartman * succeeding while we shut down the port. 2961ab4382d2SGreg Kroah-Hartman */ 2962ab4382d2SGreg Kroah-Hartman mutex_lock(&port->mutex); 29634047b371SPeter Hurley uart_port = uart_port_check(state); 29644047b371SPeter Hurley if (uart_port != uport) 29654047b371SPeter Hurley dev_alert(uport->dev, "Removing wrong port: %p != %p\n", 29664047b371SPeter Hurley uart_port, uport); 29674047b371SPeter Hurley 29684047b371SPeter Hurley if (!uart_port) { 2969b342dd51SChen Gang mutex_unlock(&port->mutex); 2970b342dd51SChen Gang ret = -EINVAL; 2971b342dd51SChen Gang goto out; 2972b342dd51SChen Gang } 2973ab4382d2SGreg Kroah-Hartman uport->flags |= UPF_DEAD; 2974ab4382d2SGreg Kroah-Hartman mutex_unlock(&port->mutex); 2975ab4382d2SGreg Kroah-Hartman 2976ab4382d2SGreg Kroah-Hartman /* 2977ab4382d2SGreg Kroah-Hartman * Remove the devices from the tty layer 2978ab4382d2SGreg Kroah-Hartman */ 2979da4c2799SJohan Hovold tty_port_unregister_device(port, drv->tty_driver, uport->line); 2980ab4382d2SGreg Kroah-Hartman 29814c6d5b4dSGeert Uytterhoeven tty = tty_port_tty_get(port); 29824c6d5b4dSGeert Uytterhoeven if (tty) { 2983ab4382d2SGreg Kroah-Hartman tty_vhangup(port->tty); 29844c6d5b4dSGeert Uytterhoeven tty_kref_put(tty); 29854c6d5b4dSGeert Uytterhoeven } 2986ab4382d2SGreg Kroah-Hartman 2987ab4382d2SGreg Kroah-Hartman /* 29885f5c9ae5SGeert Uytterhoeven * If the port is used as a console, unregister it 29895f5c9ae5SGeert Uytterhoeven */ 29905f5c9ae5SGeert Uytterhoeven if (uart_console(uport)) 29915f5c9ae5SGeert Uytterhoeven unregister_console(uport->cons); 29925f5c9ae5SGeert Uytterhoeven 29935f5c9ae5SGeert Uytterhoeven /* 2994ab4382d2SGreg Kroah-Hartman * Free the port IO and memory resources, if any. 2995ab4382d2SGreg Kroah-Hartman */ 2996a7cfaf16SFabio Estevam if (uport->type != PORT_UNKNOWN && uport->ops->release_port) 2997ab4382d2SGreg Kroah-Hartman uport->ops->release_port(uport); 2998266dcff0SGreg Kroah-Hartman kfree(uport->tty_groups); 2999f7048b15SVignesh R kfree(uport->name); 3000ab4382d2SGreg Kroah-Hartman 3001ab4382d2SGreg Kroah-Hartman /* 3002ab4382d2SGreg Kroah-Hartman * Indicate that there isn't a port here anymore. 3003ab4382d2SGreg Kroah-Hartman */ 3004ab4382d2SGreg Kroah-Hartman uport->type = PORT_UNKNOWN; 3005ab4382d2SGreg Kroah-Hartman 30064047b371SPeter Hurley mutex_lock(&port->mutex); 30079ed19428SPeter Hurley WARN_ON(atomic_dec_return(&state->refcount) < 0); 30089ed19428SPeter Hurley wait_event(state->remove_wait, !atomic_read(&state->refcount)); 3009ab4382d2SGreg Kroah-Hartman state->uart_port = NULL; 30104047b371SPeter Hurley mutex_unlock(&port->mutex); 3011b342dd51SChen Gang out: 3012ab4382d2SGreg Kroah-Hartman mutex_unlock(&port_mutex); 3013ab4382d2SGreg Kroah-Hartman 3014b342dd51SChen Gang return ret; 3015ab4382d2SGreg Kroah-Hartman } 3016ab4382d2SGreg Kroah-Hartman 3017ab4382d2SGreg Kroah-Hartman /* 3018ab4382d2SGreg Kroah-Hartman * Are the two ports equivalent? 3019ab4382d2SGreg Kroah-Hartman */ 3020ab4382d2SGreg Kroah-Hartman int uart_match_port(struct uart_port *port1, struct uart_port *port2) 3021ab4382d2SGreg Kroah-Hartman { 3022ab4382d2SGreg Kroah-Hartman if (port1->iotype != port2->iotype) 3023ab4382d2SGreg Kroah-Hartman return 0; 3024ab4382d2SGreg Kroah-Hartman 3025ab4382d2SGreg Kroah-Hartman switch (port1->iotype) { 3026ab4382d2SGreg Kroah-Hartman case UPIO_PORT: 3027ab4382d2SGreg Kroah-Hartman return (port1->iobase == port2->iobase); 3028ab4382d2SGreg Kroah-Hartman case UPIO_HUB6: 3029ab4382d2SGreg Kroah-Hartman return (port1->iobase == port2->iobase) && 3030ab4382d2SGreg Kroah-Hartman (port1->hub6 == port2->hub6); 3031ab4382d2SGreg Kroah-Hartman case UPIO_MEM: 3032bd94c407SMasahiro Yamada case UPIO_MEM16: 3033ab4382d2SGreg Kroah-Hartman case UPIO_MEM32: 30343ffb1a81SKevin Cernekee case UPIO_MEM32BE: 3035ab4382d2SGreg Kroah-Hartman case UPIO_AU: 3036ab4382d2SGreg Kroah-Hartman case UPIO_TSI: 3037ab4382d2SGreg Kroah-Hartman return (port1->mapbase == port2->mapbase); 3038ab4382d2SGreg Kroah-Hartman } 3039ab4382d2SGreg Kroah-Hartman return 0; 3040ab4382d2SGreg Kroah-Hartman } 3041ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_match_port); 3042ab4382d2SGreg Kroah-Hartman 3043027d7dacSJiri Slaby /** 3044027d7dacSJiri Slaby * uart_handle_dcd_change - handle a change of carrier detect state 3045027d7dacSJiri Slaby * @uport: uart_port structure for the open port 3046027d7dacSJiri Slaby * @status: new carrier detect status, nonzero if active 30474d90bb14SPeter Hurley * 30484d90bb14SPeter Hurley * Caller must hold uport->lock 3049027d7dacSJiri Slaby */ 3050027d7dacSJiri Slaby void uart_handle_dcd_change(struct uart_port *uport, unsigned int status) 3051027d7dacSJiri Slaby { 305242381572SGeorge Spelvin struct tty_port *port = &uport->state->port; 305343eca0aeSAlan Cox struct tty_struct *tty = port->tty; 3054c993257bSPeter Hurley struct tty_ldisc *ld; 3055027d7dacSJiri Slaby 30564d90bb14SPeter Hurley lockdep_assert_held_once(&uport->lock); 30574d90bb14SPeter Hurley 3058c993257bSPeter Hurley if (tty) { 3059c993257bSPeter Hurley ld = tty_ldisc_ref(tty); 306042381572SGeorge Spelvin if (ld) { 306142381572SGeorge Spelvin if (ld->ops->dcd_change) 3062593fb1aeSGeorge Spelvin ld->ops->dcd_change(tty, status); 306342381572SGeorge Spelvin tty_ldisc_deref(ld); 306442381572SGeorge Spelvin } 3065c993257bSPeter Hurley } 3066027d7dacSJiri Slaby 3067027d7dacSJiri Slaby uport->icount.dcd++; 3068027d7dacSJiri Slaby 3069299245a1SPeter Hurley if (uart_dcd_enabled(uport)) { 3070027d7dacSJiri Slaby if (status) 3071027d7dacSJiri Slaby wake_up_interruptible(&port->open_wait); 307243eca0aeSAlan Cox else if (tty) 307343eca0aeSAlan Cox tty_hangup(tty); 3074027d7dacSJiri Slaby } 3075027d7dacSJiri Slaby } 3076027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_handle_dcd_change); 3077027d7dacSJiri Slaby 3078027d7dacSJiri Slaby /** 3079027d7dacSJiri Slaby * uart_handle_cts_change - handle a change of clear-to-send state 3080027d7dacSJiri Slaby * @uport: uart_port structure for the open port 3081027d7dacSJiri Slaby * @status: new clear to send status, nonzero if active 30824d90bb14SPeter Hurley * 30834d90bb14SPeter Hurley * Caller must hold uport->lock 3084027d7dacSJiri Slaby */ 3085027d7dacSJiri Slaby void uart_handle_cts_change(struct uart_port *uport, unsigned int status) 3086027d7dacSJiri Slaby { 30874d90bb14SPeter Hurley lockdep_assert_held_once(&uport->lock); 30884d90bb14SPeter Hurley 3089027d7dacSJiri Slaby uport->icount.cts++; 3090027d7dacSJiri Slaby 3091391f93f2SPeter Hurley if (uart_softcts_mode(uport)) { 3092d01f4d18SPeter Hurley if (uport->hw_stopped) { 3093027d7dacSJiri Slaby if (status) { 3094d01f4d18SPeter Hurley uport->hw_stopped = 0; 3095027d7dacSJiri Slaby uport->ops->start_tx(uport); 3096027d7dacSJiri Slaby uart_write_wakeup(uport); 3097027d7dacSJiri Slaby } 3098027d7dacSJiri Slaby } else { 3099027d7dacSJiri Slaby if (!status) { 3100d01f4d18SPeter Hurley uport->hw_stopped = 1; 3101027d7dacSJiri Slaby uport->ops->stop_tx(uport); 3102027d7dacSJiri Slaby } 3103027d7dacSJiri Slaby } 3104391f93f2SPeter Hurley 3105027d7dacSJiri Slaby } 3106027d7dacSJiri Slaby } 3107027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_handle_cts_change); 3108027d7dacSJiri Slaby 3109cf75525fSJiri Slaby /** 3110cf75525fSJiri Slaby * uart_insert_char - push a char to the uart layer 3111cf75525fSJiri Slaby * 3112cf75525fSJiri Slaby * User is responsible to call tty_flip_buffer_push when they are done with 3113cf75525fSJiri Slaby * insertion. 3114cf75525fSJiri Slaby * 3115cf75525fSJiri Slaby * @port: corresponding port 3116cf75525fSJiri Slaby * @status: state of the serial port RX buffer (LSR for 8250) 3117cf75525fSJiri Slaby * @overrun: mask of overrun bits in @status 3118cf75525fSJiri Slaby * @ch: character to push 3119cf75525fSJiri Slaby * @flag: flag for the character (see TTY_NORMAL and friends) 3120cf75525fSJiri Slaby */ 3121027d7dacSJiri Slaby void uart_insert_char(struct uart_port *port, unsigned int status, 3122027d7dacSJiri Slaby unsigned int overrun, unsigned int ch, unsigned int flag) 3123027d7dacSJiri Slaby { 312492a19f9cSJiri Slaby struct tty_port *tport = &port->state->port; 3125027d7dacSJiri Slaby 3126027d7dacSJiri Slaby if ((status & port->ignore_status_mask & ~overrun) == 0) 312792a19f9cSJiri Slaby if (tty_insert_flip_char(tport, ch, flag) == 0) 3128dabfb351SCorbin ++port->icount.buf_overrun; 3129027d7dacSJiri Slaby 3130027d7dacSJiri Slaby /* 3131027d7dacSJiri Slaby * Overrun is special. Since it's reported immediately, 3132027d7dacSJiri Slaby * it doesn't affect the current character. 3133027d7dacSJiri Slaby */ 3134027d7dacSJiri Slaby if (status & ~port->ignore_status_mask & overrun) 313592a19f9cSJiri Slaby if (tty_insert_flip_char(tport, 0, TTY_OVERRUN) == 0) 3136dabfb351SCorbin ++port->icount.buf_overrun; 3137027d7dacSJiri Slaby } 3138027d7dacSJiri Slaby EXPORT_SYMBOL_GPL(uart_insert_char); 3139027d7dacSJiri Slaby 314068af4317SDmitry Safonov #ifdef CONFIG_MAGIC_SYSRQ_SERIAL 314168af4317SDmitry Safonov static const char sysrq_toggle_seq[] = CONFIG_MAGIC_SYSRQ_SERIAL_SEQUENCE; 314268af4317SDmitry Safonov 314368af4317SDmitry Safonov static void uart_sysrq_on(struct work_struct *w) 314468af4317SDmitry Safonov { 3145b18896ffSAndy Shevchenko int sysrq_toggle_seq_len = strlen(sysrq_toggle_seq); 3146b18896ffSAndy Shevchenko 314768af4317SDmitry Safonov sysrq_toggle_support(1); 3148b18896ffSAndy Shevchenko pr_info("SysRq is enabled by magic sequence '%*pE' on serial\n", 3149b18896ffSAndy Shevchenko sysrq_toggle_seq_len, sysrq_toggle_seq); 315068af4317SDmitry Safonov } 315168af4317SDmitry Safonov static DECLARE_WORK(sysrq_enable_work, uart_sysrq_on); 315268af4317SDmitry Safonov 315368af4317SDmitry Safonov /** 315468af4317SDmitry Safonov * uart_try_toggle_sysrq - Enables SysRq from serial line 315568af4317SDmitry Safonov * @port: uart_port structure where char(s) after BREAK met 315668af4317SDmitry Safonov * @ch: new character in the sequence after received BREAK 315768af4317SDmitry Safonov * 315868af4317SDmitry Safonov * Enables magic SysRq when the required sequence is met on port 315968af4317SDmitry Safonov * (see CONFIG_MAGIC_SYSRQ_SERIAL_SEQUENCE). 316068af4317SDmitry Safonov * 316168af4317SDmitry Safonov * Returns false if @ch is out of enabling sequence and should be 316268af4317SDmitry Safonov * handled some other way, true if @ch was consumed. 316368af4317SDmitry Safonov */ 316408d54703SJohan Hovold bool uart_try_toggle_sysrq(struct uart_port *port, unsigned int ch) 316568af4317SDmitry Safonov { 31662ce5eaceSAndy Shevchenko int sysrq_toggle_seq_len = strlen(sysrq_toggle_seq); 31672ce5eaceSAndy Shevchenko 31682ce5eaceSAndy Shevchenko if (!sysrq_toggle_seq_len) 316968af4317SDmitry Safonov return false; 317068af4317SDmitry Safonov 317168af4317SDmitry Safonov BUILD_BUG_ON(ARRAY_SIZE(sysrq_toggle_seq) >= U8_MAX); 317268af4317SDmitry Safonov if (sysrq_toggle_seq[port->sysrq_seq] != ch) { 317368af4317SDmitry Safonov port->sysrq_seq = 0; 317468af4317SDmitry Safonov return false; 317568af4317SDmitry Safonov } 317668af4317SDmitry Safonov 31772ce5eaceSAndy Shevchenko if (++port->sysrq_seq < sysrq_toggle_seq_len) { 317868af4317SDmitry Safonov port->sysrq = jiffies + SYSRQ_TIMEOUT; 317968af4317SDmitry Safonov return true; 318068af4317SDmitry Safonov } 318168af4317SDmitry Safonov 318268af4317SDmitry Safonov schedule_work(&sysrq_enable_work); 318368af4317SDmitry Safonov 318468af4317SDmitry Safonov port->sysrq = 0; 318568af4317SDmitry Safonov return true; 318668af4317SDmitry Safonov } 318708d54703SJohan Hovold EXPORT_SYMBOL_GPL(uart_try_toggle_sysrq); 318868af4317SDmitry Safonov #endif 318968af4317SDmitry Safonov 3190ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_write_wakeup); 3191ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_register_driver); 3192ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_unregister_driver); 3193ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_suspend_port); 3194ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_resume_port); 3195ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_add_one_port); 3196ab4382d2SGreg Kroah-Hartman EXPORT_SYMBOL(uart_remove_one_port); 3197ab4382d2SGreg Kroah-Hartman 3198ef838a81SUwe Kleine-König /** 3199743f93f8SLukas Wunner * uart_get_rs485_mode() - retrieve rs485 properties for given uart 3200a7172561SRandy Dunlap * @port: uart device's target port 3201ef838a81SUwe Kleine-König * 3202ef838a81SUwe Kleine-König * This function implements the device tree binding described in 3203ef838a81SUwe Kleine-König * Documentation/devicetree/bindings/serial/rs485.txt. 3204ef838a81SUwe Kleine-König */ 3205c150c0f3SLukas Wunner int uart_get_rs485_mode(struct uart_port *port) 3206ef838a81SUwe Kleine-König { 3207c150c0f3SLukas Wunner struct serial_rs485 *rs485conf = &port->rs485; 3208c150c0f3SLukas Wunner struct device *dev = port->dev; 3209ef838a81SUwe Kleine-König u32 rs485_delay[2]; 3210ef838a81SUwe Kleine-König int ret; 3211ef838a81SUwe Kleine-König 3212743f93f8SLukas Wunner ret = device_property_read_u32_array(dev, "rs485-rts-delay", 3213743f93f8SLukas Wunner rs485_delay, 2); 3214ef838a81SUwe Kleine-König if (!ret) { 3215ef838a81SUwe Kleine-König rs485conf->delay_rts_before_send = rs485_delay[0]; 3216ef838a81SUwe Kleine-König rs485conf->delay_rts_after_send = rs485_delay[1]; 3217ef838a81SUwe Kleine-König } else { 3218ef838a81SUwe Kleine-König rs485conf->delay_rts_before_send = 0; 3219ef838a81SUwe Kleine-König rs485conf->delay_rts_after_send = 0; 3220ef838a81SUwe Kleine-König } 3221ef838a81SUwe Kleine-König 3222ef838a81SUwe Kleine-König /* 3223f1e5b618SLukas Wunner * Clear full-duplex and enabled flags, set RTS polarity to active high 3224f1e5b618SLukas Wunner * to get to a defined state with the following properties: 3225ef838a81SUwe Kleine-König */ 3226f1e5b618SLukas Wunner rs485conf->flags &= ~(SER_RS485_RX_DURING_TX | SER_RS485_ENABLED | 3227d58a2df3SLukas Wunner SER_RS485_TERMINATE_BUS | 3228f1e5b618SLukas Wunner SER_RS485_RTS_AFTER_SEND); 3229f1e5b618SLukas Wunner rs485conf->flags |= SER_RS485_RTS_ON_SEND; 3230ef838a81SUwe Kleine-König 3231743f93f8SLukas Wunner if (device_property_read_bool(dev, "rs485-rx-during-tx")) 3232ef838a81SUwe Kleine-König rs485conf->flags |= SER_RS485_RX_DURING_TX; 3233ef838a81SUwe Kleine-König 3234743f93f8SLukas Wunner if (device_property_read_bool(dev, "linux,rs485-enabled-at-boot-time")) 3235ef838a81SUwe Kleine-König rs485conf->flags |= SER_RS485_ENABLED; 3236f1e5b618SLukas Wunner 3237f1e5b618SLukas Wunner if (device_property_read_bool(dev, "rs485-rts-active-low")) { 3238f1e5b618SLukas Wunner rs485conf->flags &= ~SER_RS485_RTS_ON_SEND; 3239f1e5b618SLukas Wunner rs485conf->flags |= SER_RS485_RTS_AFTER_SEND; 3240f1e5b618SLukas Wunner } 3241c150c0f3SLukas Wunner 3242d58a2df3SLukas Wunner /* 3243d58a2df3SLukas Wunner * Disabling termination by default is the safe choice: Else if many 3244d58a2df3SLukas Wunner * bus participants enable it, no communication is possible at all. 3245d58a2df3SLukas Wunner * Works fine for short cables and users may enable for longer cables. 3246d58a2df3SLukas Wunner */ 3247d58a2df3SLukas Wunner port->rs485_term_gpio = devm_gpiod_get_optional(dev, "rs485-term", 3248d58a2df3SLukas Wunner GPIOD_OUT_LOW); 3249d58a2df3SLukas Wunner if (IS_ERR(port->rs485_term_gpio)) { 3250d58a2df3SLukas Wunner ret = PTR_ERR(port->rs485_term_gpio); 3251d58a2df3SLukas Wunner port->rs485_term_gpio = NULL; 3252d58a2df3SLukas Wunner if (ret != -EPROBE_DEFER) 3253d58a2df3SLukas Wunner dev_err(dev, "Cannot get rs485-term-gpios\n"); 3254d58a2df3SLukas Wunner return ret; 3255d58a2df3SLukas Wunner } 3256d58a2df3SLukas Wunner 3257c150c0f3SLukas Wunner return 0; 3258ef838a81SUwe Kleine-König } 3259743f93f8SLukas Wunner EXPORT_SYMBOL_GPL(uart_get_rs485_mode); 3260ef838a81SUwe Kleine-König 3261ab4382d2SGreg Kroah-Hartman MODULE_DESCRIPTION("Serial driver core"); 3262ab4382d2SGreg Kroah-Hartman MODULE_LICENSE("GPL"); 3263