mirror of https://gitee.com/openkylin/linux.git
2942 lines
73 KiB
C
2942 lines
73 KiB
C
/*
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* Driver core for serial ports
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*
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* Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
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*
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* Copyright 1999 ARM Limited
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* Copyright (C) 2000-2001 Deep Blue Solutions Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/module.h>
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#include <linux/tty.h>
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#include <linux/tty_flip.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/console.h>
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#include <linux/of.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/device.h>
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#include <linux/serial.h> /* for serial_state and serial_icounter_struct */
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#include <linux/serial_core.h>
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#include <linux/delay.h>
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#include <linux/mutex.h>
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#include <asm/irq.h>
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#include <asm/uaccess.h>
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/*
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* This is used to lock changes in serial line configuration.
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*/
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static DEFINE_MUTEX(port_mutex);
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/*
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* lockdep: port->lock is initialized in two places, but we
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* want only one lock-class:
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*/
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static struct lock_class_key port_lock_key;
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#define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8)
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static void uart_change_speed(struct tty_struct *tty, struct uart_state *state,
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struct ktermios *old_termios);
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static void uart_wait_until_sent(struct tty_struct *tty, int timeout);
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static void uart_change_pm(struct uart_state *state,
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enum uart_pm_state pm_state);
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static void uart_port_shutdown(struct tty_port *port);
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static int uart_dcd_enabled(struct uart_port *uport)
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{
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return !!(uport->status & UPSTAT_DCD_ENABLE);
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}
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/*
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* This routine is used by the interrupt handler to schedule processing in
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* the software interrupt portion of the driver.
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*/
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void uart_write_wakeup(struct uart_port *port)
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{
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struct uart_state *state = port->state;
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/*
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* This means you called this function _after_ the port was
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* closed. No cookie for you.
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*/
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BUG_ON(!state);
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tty_wakeup(state->port.tty);
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}
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static void uart_stop(struct tty_struct *tty)
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{
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struct uart_state *state = tty->driver_data;
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struct uart_port *port = state->uart_port;
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unsigned long flags;
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spin_lock_irqsave(&port->lock, flags);
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port->ops->stop_tx(port);
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spin_unlock_irqrestore(&port->lock, flags);
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}
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static void __uart_start(struct tty_struct *tty)
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{
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struct uart_state *state = tty->driver_data;
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struct uart_port *port = state->uart_port;
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if (!uart_tx_stopped(port))
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port->ops->start_tx(port);
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}
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static void uart_start(struct tty_struct *tty)
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{
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struct uart_state *state = tty->driver_data;
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struct uart_port *port = state->uart_port;
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unsigned long flags;
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spin_lock_irqsave(&port->lock, flags);
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__uart_start(tty);
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spin_unlock_irqrestore(&port->lock, flags);
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}
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static inline void
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uart_update_mctrl(struct uart_port *port, unsigned int set, unsigned int clear)
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{
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unsigned long flags;
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unsigned int old;
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spin_lock_irqsave(&port->lock, flags);
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old = port->mctrl;
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port->mctrl = (old & ~clear) | set;
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if (old != port->mctrl)
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port->ops->set_mctrl(port, port->mctrl);
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spin_unlock_irqrestore(&port->lock, flags);
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}
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#define uart_set_mctrl(port, set) uart_update_mctrl(port, set, 0)
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#define uart_clear_mctrl(port, clear) uart_update_mctrl(port, 0, clear)
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/*
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* Startup the port. This will be called once per open. All calls
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* will be serialised by the per-port mutex.
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*/
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static int uart_port_startup(struct tty_struct *tty, struct uart_state *state,
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int init_hw)
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{
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struct uart_port *uport = state->uart_port;
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unsigned long page;
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int retval = 0;
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if (uport->type == PORT_UNKNOWN)
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return 1;
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/*
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* Make sure the device is in D0 state.
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*/
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uart_change_pm(state, UART_PM_STATE_ON);
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/*
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* Initialise and allocate the transmit and temporary
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* buffer.
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*/
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if (!state->xmit.buf) {
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/* This is protected by the per port mutex */
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page = get_zeroed_page(GFP_KERNEL);
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if (!page)
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return -ENOMEM;
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state->xmit.buf = (unsigned char *) page;
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uart_circ_clear(&state->xmit);
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}
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retval = uport->ops->startup(uport);
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if (retval == 0) {
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if (uart_console(uport) && uport->cons->cflag) {
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tty->termios.c_cflag = uport->cons->cflag;
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uport->cons->cflag = 0;
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}
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/*
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* Initialise the hardware port settings.
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*/
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uart_change_speed(tty, state, NULL);
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if (init_hw) {
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/*
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* Setup the RTS and DTR signals once the
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* port is open and ready to respond.
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*/
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if (tty->termios.c_cflag & CBAUD)
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uart_set_mctrl(uport, TIOCM_RTS | TIOCM_DTR);
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}
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}
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/*
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* This is to allow setserial on this port. People may want to set
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* port/irq/type and then reconfigure the port properly if it failed
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* now.
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*/
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if (retval && capable(CAP_SYS_ADMIN))
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return 1;
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return retval;
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}
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static int uart_startup(struct tty_struct *tty, struct uart_state *state,
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int init_hw)
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{
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struct tty_port *port = &state->port;
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int retval;
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if (port->flags & ASYNC_INITIALIZED)
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return 0;
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/*
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* Set the TTY IO error marker - we will only clear this
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* once we have successfully opened the port.
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*/
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set_bit(TTY_IO_ERROR, &tty->flags);
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retval = uart_port_startup(tty, state, init_hw);
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if (!retval) {
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set_bit(ASYNCB_INITIALIZED, &port->flags);
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clear_bit(TTY_IO_ERROR, &tty->flags);
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} else if (retval > 0)
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retval = 0;
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return retval;
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}
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/*
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* This routine will shutdown a serial port; interrupts are disabled, and
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* DTR is dropped if the hangup on close termio flag is on. Calls to
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* uart_shutdown are serialised by the per-port semaphore.
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*/
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static void uart_shutdown(struct tty_struct *tty, struct uart_state *state)
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{
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struct uart_port *uport = state->uart_port;
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struct tty_port *port = &state->port;
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/*
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* Set the TTY IO error marker
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*/
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if (tty)
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set_bit(TTY_IO_ERROR, &tty->flags);
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if (test_and_clear_bit(ASYNCB_INITIALIZED, &port->flags)) {
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/*
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* Turn off DTR and RTS early.
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*/
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if (uart_console(uport) && tty)
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uport->cons->cflag = tty->termios.c_cflag;
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if (!tty || (tty->termios.c_cflag & HUPCL))
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uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS);
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uart_port_shutdown(port);
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}
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/*
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* It's possible for shutdown to be called after suspend if we get
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* a DCD drop (hangup) at just the right time. Clear suspended bit so
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* we don't try to resume a port that has been shutdown.
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*/
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clear_bit(ASYNCB_SUSPENDED, &port->flags);
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/*
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* Free the transmit buffer page.
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*/
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if (state->xmit.buf) {
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free_page((unsigned long)state->xmit.buf);
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state->xmit.buf = NULL;
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}
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}
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/**
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* uart_update_timeout - update per-port FIFO timeout.
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* @port: uart_port structure describing the port
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* @cflag: termios cflag value
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* @baud: speed of the port
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*
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* Set the port FIFO timeout value. The @cflag value should
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* reflect the actual hardware settings.
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*/
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void
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uart_update_timeout(struct uart_port *port, unsigned int cflag,
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unsigned int baud)
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{
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unsigned int bits;
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/* byte size and parity */
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switch (cflag & CSIZE) {
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case CS5:
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bits = 7;
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break;
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case CS6:
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bits = 8;
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break;
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case CS7:
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bits = 9;
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break;
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default:
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bits = 10;
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break; /* CS8 */
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}
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if (cflag & CSTOPB)
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bits++;
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if (cflag & PARENB)
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bits++;
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/*
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* The total number of bits to be transmitted in the fifo.
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*/
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bits = bits * port->fifosize;
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/*
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* Figure the timeout to send the above number of bits.
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* Add .02 seconds of slop
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*/
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port->timeout = (HZ * bits) / baud + HZ/50;
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}
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EXPORT_SYMBOL(uart_update_timeout);
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/**
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* uart_get_baud_rate - return baud rate for a particular port
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* @port: uart_port structure describing the port in question.
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* @termios: desired termios settings.
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* @old: old termios (or NULL)
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* @min: minimum acceptable baud rate
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* @max: maximum acceptable baud rate
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*
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* Decode the termios structure into a numeric baud rate,
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* taking account of the magic 38400 baud rate (with spd_*
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* flags), and mapping the %B0 rate to 9600 baud.
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*
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* If the new baud rate is invalid, try the old termios setting.
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* If it's still invalid, we try 9600 baud.
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*
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* Update the @termios structure to reflect the baud rate
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* we're actually going to be using. Don't do this for the case
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* where B0 is requested ("hang up").
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*/
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unsigned int
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uart_get_baud_rate(struct uart_port *port, struct ktermios *termios,
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struct ktermios *old, unsigned int min, unsigned int max)
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{
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unsigned int try, baud, altbaud = 38400;
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int hung_up = 0;
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upf_t flags = port->flags & UPF_SPD_MASK;
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if (flags == UPF_SPD_HI)
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altbaud = 57600;
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else if (flags == UPF_SPD_VHI)
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altbaud = 115200;
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else if (flags == UPF_SPD_SHI)
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altbaud = 230400;
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else if (flags == UPF_SPD_WARP)
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altbaud = 460800;
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for (try = 0; try < 2; try++) {
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baud = tty_termios_baud_rate(termios);
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/*
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* The spd_hi, spd_vhi, spd_shi, spd_warp kludge...
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* Die! Die! Die!
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*/
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if (try == 0 && baud == 38400)
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baud = altbaud;
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/*
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* Special case: B0 rate.
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*/
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if (baud == 0) {
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hung_up = 1;
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baud = 9600;
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}
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if (baud >= min && baud <= max)
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return baud;
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/*
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* Oops, the quotient was zero. Try again with
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* the old baud rate if possible.
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*/
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termios->c_cflag &= ~CBAUD;
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if (old) {
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baud = tty_termios_baud_rate(old);
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if (!hung_up)
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tty_termios_encode_baud_rate(termios,
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baud, baud);
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old = NULL;
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continue;
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}
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/*
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* As a last resort, if the range cannot be met then clip to
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* the nearest chip supported rate.
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*/
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if (!hung_up) {
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if (baud <= min)
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tty_termios_encode_baud_rate(termios,
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min + 1, min + 1);
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else
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tty_termios_encode_baud_rate(termios,
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max - 1, max - 1);
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}
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}
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/* Should never happen */
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WARN_ON(1);
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return 0;
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}
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EXPORT_SYMBOL(uart_get_baud_rate);
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/**
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* uart_get_divisor - return uart clock divisor
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* @port: uart_port structure describing the port.
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* @baud: desired baud rate
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*
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* Calculate the uart clock divisor for the port.
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*/
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unsigned int
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uart_get_divisor(struct uart_port *port, unsigned int baud)
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{
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unsigned int quot;
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/*
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* Old custom speed handling.
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*/
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if (baud == 38400 && (port->flags & UPF_SPD_MASK) == UPF_SPD_CUST)
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quot = port->custom_divisor;
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else
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quot = DIV_ROUND_CLOSEST(port->uartclk, 16 * baud);
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return quot;
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}
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EXPORT_SYMBOL(uart_get_divisor);
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/* Caller holds port mutex */
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static void uart_change_speed(struct tty_struct *tty, struct uart_state *state,
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struct ktermios *old_termios)
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{
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struct uart_port *uport = state->uart_port;
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struct ktermios *termios;
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int hw_stopped;
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/*
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* If we have no tty, termios, or the port does not exist,
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* then we can't set the parameters for this port.
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*/
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if (!tty || uport->type == PORT_UNKNOWN)
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return;
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termios = &tty->termios;
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uport->ops->set_termios(uport, termios, old_termios);
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/*
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* Set modem status enables based on termios cflag
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*/
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spin_lock_irq(&uport->lock);
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if (termios->c_cflag & CRTSCTS)
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uport->status |= UPSTAT_CTS_ENABLE;
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else
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uport->status &= ~UPSTAT_CTS_ENABLE;
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if (termios->c_cflag & CLOCAL)
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uport->status &= ~UPSTAT_DCD_ENABLE;
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else
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uport->status |= UPSTAT_DCD_ENABLE;
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/* reset sw-assisted CTS flow control based on (possibly) new mode */
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hw_stopped = uport->hw_stopped;
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uport->hw_stopped = uart_softcts_mode(uport) &&
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!(uport->ops->get_mctrl(uport) & TIOCM_CTS);
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if (uport->hw_stopped) {
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if (!hw_stopped)
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uport->ops->stop_tx(uport);
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} else {
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if (hw_stopped)
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__uart_start(tty);
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}
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spin_unlock_irq(&uport->lock);
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}
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static inline int __uart_put_char(struct uart_port *port,
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struct circ_buf *circ, unsigned char c)
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{
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unsigned long flags;
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int ret = 0;
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if (!circ->buf)
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return 0;
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spin_lock_irqsave(&port->lock, flags);
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if (uart_circ_chars_free(circ) != 0) {
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circ->buf[circ->head] = c;
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circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1);
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ret = 1;
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}
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spin_unlock_irqrestore(&port->lock, flags);
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return ret;
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}
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static int uart_put_char(struct tty_struct *tty, unsigned char ch)
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{
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struct uart_state *state = tty->driver_data;
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return __uart_put_char(state->uart_port, &state->xmit, ch);
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}
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static void uart_flush_chars(struct tty_struct *tty)
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{
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uart_start(tty);
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}
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static int uart_write(struct tty_struct *tty,
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const unsigned char *buf, int count)
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{
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struct uart_state *state = tty->driver_data;
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struct uart_port *port;
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struct circ_buf *circ;
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unsigned long flags;
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int c, ret = 0;
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/*
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* This means you called this function _after_ the port was
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* closed. No cookie for you.
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*/
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if (!state) {
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WARN_ON(1);
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return -EL3HLT;
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}
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port = state->uart_port;
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circ = &state->xmit;
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if (!circ->buf)
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return 0;
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spin_lock_irqsave(&port->lock, flags);
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while (1) {
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c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE);
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if (count < c)
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c = count;
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if (c <= 0)
|
|
break;
|
|
memcpy(circ->buf + circ->head, buf, c);
|
|
circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1);
|
|
buf += c;
|
|
count -= c;
|
|
ret += c;
|
|
}
|
|
|
|
__uart_start(tty);
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int uart_write_room(struct tty_struct *tty)
|
|
{
|
|
struct uart_state *state = tty->driver_data;
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
spin_lock_irqsave(&state->uart_port->lock, flags);
|
|
ret = uart_circ_chars_free(&state->xmit);
|
|
spin_unlock_irqrestore(&state->uart_port->lock, flags);
|
|
return ret;
|
|
}
|
|
|
|
static int uart_chars_in_buffer(struct tty_struct *tty)
|
|
{
|
|
struct uart_state *state = tty->driver_data;
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
spin_lock_irqsave(&state->uart_port->lock, flags);
|
|
ret = uart_circ_chars_pending(&state->xmit);
|
|
spin_unlock_irqrestore(&state->uart_port->lock, flags);
|
|
return ret;
|
|
}
|
|
|
|
static void uart_flush_buffer(struct tty_struct *tty)
|
|
{
|
|
struct uart_state *state = tty->driver_data;
|
|
struct uart_port *port;
|
|
unsigned long flags;
|
|
|
|
/*
|
|
* This means you called this function _after_ the port was
|
|
* closed. No cookie for you.
|
|
*/
|
|
if (!state) {
|
|
WARN_ON(1);
|
|
return;
|
|
}
|
|
|
|
port = state->uart_port;
|
|
pr_debug("uart_flush_buffer(%d) called\n", tty->index);
|
|
|
|
spin_lock_irqsave(&port->lock, flags);
|
|
uart_circ_clear(&state->xmit);
|
|
if (port->ops->flush_buffer)
|
|
port->ops->flush_buffer(port);
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
tty_wakeup(tty);
|
|
}
|
|
|
|
/*
|
|
* This function is used to send a high-priority XON/XOFF character to
|
|
* the device
|
|
*/
|
|
static void uart_send_xchar(struct tty_struct *tty, char ch)
|
|
{
|
|
struct uart_state *state = tty->driver_data;
|
|
struct uart_port *port = state->uart_port;
|
|
unsigned long flags;
|
|
|
|
if (port->ops->send_xchar)
|
|
port->ops->send_xchar(port, ch);
|
|
else {
|
|
spin_lock_irqsave(&port->lock, flags);
|
|
port->x_char = ch;
|
|
if (ch)
|
|
port->ops->start_tx(port);
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
}
|
|
}
|
|
|
|
static void uart_throttle(struct tty_struct *tty)
|
|
{
|
|
struct uart_state *state = tty->driver_data;
|
|
struct uart_port *port = state->uart_port;
|
|
upstat_t mask = 0;
|
|
|
|
if (I_IXOFF(tty))
|
|
mask |= UPSTAT_AUTOXOFF;
|
|
if (tty->termios.c_cflag & CRTSCTS)
|
|
mask |= UPSTAT_AUTORTS;
|
|
|
|
if (port->status & mask) {
|
|
port->ops->throttle(port);
|
|
mask &= ~port->status;
|
|
}
|
|
|
|
if (mask & UPSTAT_AUTOXOFF)
|
|
uart_send_xchar(tty, STOP_CHAR(tty));
|
|
|
|
if (mask & UPSTAT_AUTORTS)
|
|
uart_clear_mctrl(port, TIOCM_RTS);
|
|
}
|
|
|
|
static void uart_unthrottle(struct tty_struct *tty)
|
|
{
|
|
struct uart_state *state = tty->driver_data;
|
|
struct uart_port *port = state->uart_port;
|
|
upstat_t mask = 0;
|
|
|
|
if (I_IXOFF(tty))
|
|
mask |= UPSTAT_AUTOXOFF;
|
|
if (tty->termios.c_cflag & CRTSCTS)
|
|
mask |= UPSTAT_AUTORTS;
|
|
|
|
if (port->status & mask) {
|
|
port->ops->unthrottle(port);
|
|
mask &= ~port->status;
|
|
}
|
|
|
|
if (mask & UPSTAT_AUTOXOFF)
|
|
uart_send_xchar(tty, START_CHAR(tty));
|
|
|
|
if (mask & UPSTAT_AUTORTS)
|
|
uart_set_mctrl(port, TIOCM_RTS);
|
|
}
|
|
|
|
static void do_uart_get_info(struct tty_port *port,
|
|
struct serial_struct *retinfo)
|
|
{
|
|
struct uart_state *state = container_of(port, struct uart_state, port);
|
|
struct uart_port *uport = state->uart_port;
|
|
|
|
memset(retinfo, 0, sizeof(*retinfo));
|
|
|
|
retinfo->type = uport->type;
|
|
retinfo->line = uport->line;
|
|
retinfo->port = uport->iobase;
|
|
if (HIGH_BITS_OFFSET)
|
|
retinfo->port_high = (long) uport->iobase >> HIGH_BITS_OFFSET;
|
|
retinfo->irq = uport->irq;
|
|
retinfo->flags = uport->flags;
|
|
retinfo->xmit_fifo_size = uport->fifosize;
|
|
retinfo->baud_base = uport->uartclk / 16;
|
|
retinfo->close_delay = jiffies_to_msecs(port->close_delay) / 10;
|
|
retinfo->closing_wait = port->closing_wait == ASYNC_CLOSING_WAIT_NONE ?
|
|
ASYNC_CLOSING_WAIT_NONE :
|
|
jiffies_to_msecs(port->closing_wait) / 10;
|
|
retinfo->custom_divisor = uport->custom_divisor;
|
|
retinfo->hub6 = uport->hub6;
|
|
retinfo->io_type = uport->iotype;
|
|
retinfo->iomem_reg_shift = uport->regshift;
|
|
retinfo->iomem_base = (void *)(unsigned long)uport->mapbase;
|
|
}
|
|
|
|
static void uart_get_info(struct tty_port *port,
|
|
struct serial_struct *retinfo)
|
|
{
|
|
/* Ensure the state we copy is consistent and no hardware changes
|
|
occur as we go */
|
|
mutex_lock(&port->mutex);
|
|
do_uart_get_info(port, retinfo);
|
|
mutex_unlock(&port->mutex);
|
|
}
|
|
|
|
static int uart_get_info_user(struct tty_port *port,
|
|
struct serial_struct __user *retinfo)
|
|
{
|
|
struct serial_struct tmp;
|
|
uart_get_info(port, &tmp);
|
|
|
|
if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
|
|
static int uart_set_info(struct tty_struct *tty, struct tty_port *port,
|
|
struct uart_state *state,
|
|
struct serial_struct *new_info)
|
|
{
|
|
struct uart_port *uport = state->uart_port;
|
|
unsigned long new_port;
|
|
unsigned int change_irq, change_port, closing_wait;
|
|
unsigned int old_custom_divisor, close_delay;
|
|
upf_t old_flags, new_flags;
|
|
int retval = 0;
|
|
|
|
new_port = new_info->port;
|
|
if (HIGH_BITS_OFFSET)
|
|
new_port += (unsigned long) new_info->port_high << HIGH_BITS_OFFSET;
|
|
|
|
new_info->irq = irq_canonicalize(new_info->irq);
|
|
close_delay = msecs_to_jiffies(new_info->close_delay * 10);
|
|
closing_wait = new_info->closing_wait == ASYNC_CLOSING_WAIT_NONE ?
|
|
ASYNC_CLOSING_WAIT_NONE :
|
|
msecs_to_jiffies(new_info->closing_wait * 10);
|
|
|
|
|
|
change_irq = !(uport->flags & UPF_FIXED_PORT)
|
|
&& new_info->irq != uport->irq;
|
|
|
|
/*
|
|
* Since changing the 'type' of the port changes its resource
|
|
* allocations, we should treat type changes the same as
|
|
* IO port changes.
|
|
*/
|
|
change_port = !(uport->flags & UPF_FIXED_PORT)
|
|
&& (new_port != uport->iobase ||
|
|
(unsigned long)new_info->iomem_base != uport->mapbase ||
|
|
new_info->hub6 != uport->hub6 ||
|
|
new_info->io_type != uport->iotype ||
|
|
new_info->iomem_reg_shift != uport->regshift ||
|
|
new_info->type != uport->type);
|
|
|
|
old_flags = uport->flags;
|
|
new_flags = new_info->flags;
|
|
old_custom_divisor = uport->custom_divisor;
|
|
|
|
if (!capable(CAP_SYS_ADMIN)) {
|
|
retval = -EPERM;
|
|
if (change_irq || change_port ||
|
|
(new_info->baud_base != uport->uartclk / 16) ||
|
|
(close_delay != port->close_delay) ||
|
|
(closing_wait != port->closing_wait) ||
|
|
(new_info->xmit_fifo_size &&
|
|
new_info->xmit_fifo_size != uport->fifosize) ||
|
|
(((new_flags ^ old_flags) & ~UPF_USR_MASK) != 0))
|
|
goto exit;
|
|
uport->flags = ((uport->flags & ~UPF_USR_MASK) |
|
|
(new_flags & UPF_USR_MASK));
|
|
uport->custom_divisor = new_info->custom_divisor;
|
|
goto check_and_exit;
|
|
}
|
|
|
|
/*
|
|
* Ask the low level driver to verify the settings.
|
|
*/
|
|
if (uport->ops->verify_port)
|
|
retval = uport->ops->verify_port(uport, new_info);
|
|
|
|
if ((new_info->irq >= nr_irqs) || (new_info->irq < 0) ||
|
|
(new_info->baud_base < 9600))
|
|
retval = -EINVAL;
|
|
|
|
if (retval)
|
|
goto exit;
|
|
|
|
if (change_port || change_irq) {
|
|
retval = -EBUSY;
|
|
|
|
/*
|
|
* Make sure that we are the sole user of this port.
|
|
*/
|
|
if (tty_port_users(port) > 1)
|
|
goto exit;
|
|
|
|
/*
|
|
* We need to shutdown the serial port at the old
|
|
* port/type/irq combination.
|
|
*/
|
|
uart_shutdown(tty, state);
|
|
}
|
|
|
|
if (change_port) {
|
|
unsigned long old_iobase, old_mapbase;
|
|
unsigned int old_type, old_iotype, old_hub6, old_shift;
|
|
|
|
old_iobase = uport->iobase;
|
|
old_mapbase = uport->mapbase;
|
|
old_type = uport->type;
|
|
old_hub6 = uport->hub6;
|
|
old_iotype = uport->iotype;
|
|
old_shift = uport->regshift;
|
|
|
|
/*
|
|
* Free and release old regions
|
|
*/
|
|
if (old_type != PORT_UNKNOWN)
|
|
uport->ops->release_port(uport);
|
|
|
|
uport->iobase = new_port;
|
|
uport->type = new_info->type;
|
|
uport->hub6 = new_info->hub6;
|
|
uport->iotype = new_info->io_type;
|
|
uport->regshift = new_info->iomem_reg_shift;
|
|
uport->mapbase = (unsigned long)new_info->iomem_base;
|
|
|
|
/*
|
|
* Claim and map the new regions
|
|
*/
|
|
if (uport->type != PORT_UNKNOWN) {
|
|
retval = uport->ops->request_port(uport);
|
|
} else {
|
|
/* Always success - Jean II */
|
|
retval = 0;
|
|
}
|
|
|
|
/*
|
|
* If we fail to request resources for the
|
|
* new port, try to restore the old settings.
|
|
*/
|
|
if (retval) {
|
|
uport->iobase = old_iobase;
|
|
uport->type = old_type;
|
|
uport->hub6 = old_hub6;
|
|
uport->iotype = old_iotype;
|
|
uport->regshift = old_shift;
|
|
uport->mapbase = old_mapbase;
|
|
|
|
if (old_type != PORT_UNKNOWN) {
|
|
retval = uport->ops->request_port(uport);
|
|
/*
|
|
* If we failed to restore the old settings,
|
|
* we fail like this.
|
|
*/
|
|
if (retval)
|
|
uport->type = PORT_UNKNOWN;
|
|
|
|
/*
|
|
* We failed anyway.
|
|
*/
|
|
retval = -EBUSY;
|
|
}
|
|
|
|
/* Added to return the correct error -Ram Gupta */
|
|
goto exit;
|
|
}
|
|
}
|
|
|
|
if (change_irq)
|
|
uport->irq = new_info->irq;
|
|
if (!(uport->flags & UPF_FIXED_PORT))
|
|
uport->uartclk = new_info->baud_base * 16;
|
|
uport->flags = (uport->flags & ~UPF_CHANGE_MASK) |
|
|
(new_flags & UPF_CHANGE_MASK);
|
|
uport->custom_divisor = new_info->custom_divisor;
|
|
port->close_delay = close_delay;
|
|
port->closing_wait = closing_wait;
|
|
if (new_info->xmit_fifo_size)
|
|
uport->fifosize = new_info->xmit_fifo_size;
|
|
port->low_latency = (uport->flags & UPF_LOW_LATENCY) ? 1 : 0;
|
|
|
|
check_and_exit:
|
|
retval = 0;
|
|
if (uport->type == PORT_UNKNOWN)
|
|
goto exit;
|
|
if (port->flags & ASYNC_INITIALIZED) {
|
|
if (((old_flags ^ uport->flags) & UPF_SPD_MASK) ||
|
|
old_custom_divisor != uport->custom_divisor) {
|
|
/*
|
|
* If they're setting up a custom divisor or speed,
|
|
* instead of clearing it, then bitch about it. No
|
|
* need to rate-limit; it's CAP_SYS_ADMIN only.
|
|
*/
|
|
if (uport->flags & UPF_SPD_MASK) {
|
|
dev_notice(uport->dev,
|
|
"%s sets custom speed on %s. This is deprecated.\n",
|
|
current->comm,
|
|
tty_name(port->tty));
|
|
}
|
|
uart_change_speed(tty, state, NULL);
|
|
}
|
|
} else
|
|
retval = uart_startup(tty, state, 1);
|
|
exit:
|
|
return retval;
|
|
}
|
|
|
|
static int uart_set_info_user(struct tty_struct *tty, struct uart_state *state,
|
|
struct serial_struct __user *newinfo)
|
|
{
|
|
struct serial_struct new_serial;
|
|
struct tty_port *port = &state->port;
|
|
int retval;
|
|
|
|
if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
|
|
return -EFAULT;
|
|
|
|
/*
|
|
* This semaphore protects port->count. It is also
|
|
* very useful to prevent opens. Also, take the
|
|
* port configuration semaphore to make sure that a
|
|
* module insertion/removal doesn't change anything
|
|
* under us.
|
|
*/
|
|
mutex_lock(&port->mutex);
|
|
retval = uart_set_info(tty, port, state, &new_serial);
|
|
mutex_unlock(&port->mutex);
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* uart_get_lsr_info - get line status register info
|
|
* @tty: tty associated with the UART
|
|
* @state: UART being queried
|
|
* @value: returned modem value
|
|
*
|
|
* Note: uart_ioctl protects us against hangups.
|
|
*/
|
|
static int uart_get_lsr_info(struct tty_struct *tty,
|
|
struct uart_state *state, unsigned int __user *value)
|
|
{
|
|
struct uart_port *uport = state->uart_port;
|
|
unsigned int result;
|
|
|
|
result = uport->ops->tx_empty(uport);
|
|
|
|
/*
|
|
* If we're about to load something into the transmit
|
|
* register, we'll pretend the transmitter isn't empty to
|
|
* avoid a race condition (depending on when the transmit
|
|
* interrupt happens).
|
|
*/
|
|
if (uport->x_char ||
|
|
((uart_circ_chars_pending(&state->xmit) > 0) &&
|
|
!uart_tx_stopped(uport)))
|
|
result &= ~TIOCSER_TEMT;
|
|
|
|
return put_user(result, value);
|
|
}
|
|
|
|
static int uart_tiocmget(struct tty_struct *tty)
|
|
{
|
|
struct uart_state *state = tty->driver_data;
|
|
struct tty_port *port = &state->port;
|
|
struct uart_port *uport = state->uart_port;
|
|
int result = -EIO;
|
|
|
|
mutex_lock(&port->mutex);
|
|
if (!(tty->flags & (1 << TTY_IO_ERROR))) {
|
|
result = uport->mctrl;
|
|
spin_lock_irq(&uport->lock);
|
|
result |= uport->ops->get_mctrl(uport);
|
|
spin_unlock_irq(&uport->lock);
|
|
}
|
|
mutex_unlock(&port->mutex);
|
|
|
|
return result;
|
|
}
|
|
|
|
static int
|
|
uart_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear)
|
|
{
|
|
struct uart_state *state = tty->driver_data;
|
|
struct uart_port *uport = state->uart_port;
|
|
struct tty_port *port = &state->port;
|
|
int ret = -EIO;
|
|
|
|
mutex_lock(&port->mutex);
|
|
if (!(tty->flags & (1 << TTY_IO_ERROR))) {
|
|
uart_update_mctrl(uport, set, clear);
|
|
ret = 0;
|
|
}
|
|
mutex_unlock(&port->mutex);
|
|
return ret;
|
|
}
|
|
|
|
static int uart_break_ctl(struct tty_struct *tty, int break_state)
|
|
{
|
|
struct uart_state *state = tty->driver_data;
|
|
struct tty_port *port = &state->port;
|
|
struct uart_port *uport = state->uart_port;
|
|
|
|
mutex_lock(&port->mutex);
|
|
|
|
if (uport->type != PORT_UNKNOWN)
|
|
uport->ops->break_ctl(uport, break_state);
|
|
|
|
mutex_unlock(&port->mutex);
|
|
return 0;
|
|
}
|
|
|
|
static int uart_do_autoconfig(struct tty_struct *tty,struct uart_state *state)
|
|
{
|
|
struct uart_port *uport = state->uart_port;
|
|
struct tty_port *port = &state->port;
|
|
int flags, ret;
|
|
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
|
|
/*
|
|
* Take the per-port semaphore. This prevents count from
|
|
* changing, and hence any extra opens of the port while
|
|
* we're auto-configuring.
|
|
*/
|
|
if (mutex_lock_interruptible(&port->mutex))
|
|
return -ERESTARTSYS;
|
|
|
|
ret = -EBUSY;
|
|
if (tty_port_users(port) == 1) {
|
|
uart_shutdown(tty, state);
|
|
|
|
/*
|
|
* If we already have a port type configured,
|
|
* we must release its resources.
|
|
*/
|
|
if (uport->type != PORT_UNKNOWN)
|
|
uport->ops->release_port(uport);
|
|
|
|
flags = UART_CONFIG_TYPE;
|
|
if (uport->flags & UPF_AUTO_IRQ)
|
|
flags |= UART_CONFIG_IRQ;
|
|
|
|
/*
|
|
* This will claim the ports resources if
|
|
* a port is found.
|
|
*/
|
|
uport->ops->config_port(uport, flags);
|
|
|
|
ret = uart_startup(tty, state, 1);
|
|
}
|
|
mutex_unlock(&port->mutex);
|
|
return ret;
|
|
}
|
|
|
|
static void uart_enable_ms(struct uart_port *uport)
|
|
{
|
|
/*
|
|
* Force modem status interrupts on
|
|
*/
|
|
if (uport->ops->enable_ms)
|
|
uport->ops->enable_ms(uport);
|
|
}
|
|
|
|
/*
|
|
* Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
|
|
* - mask passed in arg for lines of interest
|
|
* (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
|
|
* Caller should use TIOCGICOUNT to see which one it was
|
|
*
|
|
* FIXME: This wants extracting into a common all driver implementation
|
|
* of TIOCMWAIT using tty_port.
|
|
*/
|
|
static int
|
|
uart_wait_modem_status(struct uart_state *state, unsigned long arg)
|
|
{
|
|
struct uart_port *uport = state->uart_port;
|
|
struct tty_port *port = &state->port;
|
|
DECLARE_WAITQUEUE(wait, current);
|
|
struct uart_icount cprev, cnow;
|
|
int ret;
|
|
|
|
/*
|
|
* note the counters on entry
|
|
*/
|
|
spin_lock_irq(&uport->lock);
|
|
memcpy(&cprev, &uport->icount, sizeof(struct uart_icount));
|
|
uart_enable_ms(uport);
|
|
spin_unlock_irq(&uport->lock);
|
|
|
|
add_wait_queue(&port->delta_msr_wait, &wait);
|
|
for (;;) {
|
|
spin_lock_irq(&uport->lock);
|
|
memcpy(&cnow, &uport->icount, sizeof(struct uart_icount));
|
|
spin_unlock_irq(&uport->lock);
|
|
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
|
|
if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
|
|
((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
|
|
((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
|
|
((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
|
|
ret = 0;
|
|
break;
|
|
}
|
|
|
|
schedule();
|
|
|
|
/* see if a signal did it */
|
|
if (signal_pending(current)) {
|
|
ret = -ERESTARTSYS;
|
|
break;
|
|
}
|
|
|
|
cprev = cnow;
|
|
}
|
|
__set_current_state(TASK_RUNNING);
|
|
remove_wait_queue(&port->delta_msr_wait, &wait);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
|
|
* Return: write counters to the user passed counter struct
|
|
* NB: both 1->0 and 0->1 transitions are counted except for
|
|
* RI where only 0->1 is counted.
|
|
*/
|
|
static int uart_get_icount(struct tty_struct *tty,
|
|
struct serial_icounter_struct *icount)
|
|
{
|
|
struct uart_state *state = tty->driver_data;
|
|
struct uart_icount cnow;
|
|
struct uart_port *uport = state->uart_port;
|
|
|
|
spin_lock_irq(&uport->lock);
|
|
memcpy(&cnow, &uport->icount, sizeof(struct uart_icount));
|
|
spin_unlock_irq(&uport->lock);
|
|
|
|
icount->cts = cnow.cts;
|
|
icount->dsr = cnow.dsr;
|
|
icount->rng = cnow.rng;
|
|
icount->dcd = cnow.dcd;
|
|
icount->rx = cnow.rx;
|
|
icount->tx = cnow.tx;
|
|
icount->frame = cnow.frame;
|
|
icount->overrun = cnow.overrun;
|
|
icount->parity = cnow.parity;
|
|
icount->brk = cnow.brk;
|
|
icount->buf_overrun = cnow.buf_overrun;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int uart_get_rs485_config(struct uart_port *port,
|
|
struct serial_rs485 __user *rs485)
|
|
{
|
|
unsigned long flags;
|
|
struct serial_rs485 aux;
|
|
|
|
spin_lock_irqsave(&port->lock, flags);
|
|
aux = port->rs485;
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
|
|
if (copy_to_user(rs485, &aux, sizeof(aux)))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int uart_set_rs485_config(struct uart_port *port,
|
|
struct serial_rs485 __user *rs485_user)
|
|
{
|
|
struct serial_rs485 rs485;
|
|
int ret;
|
|
unsigned long flags;
|
|
|
|
if (!port->rs485_config)
|
|
return -ENOIOCTLCMD;
|
|
|
|
if (copy_from_user(&rs485, rs485_user, sizeof(*rs485_user)))
|
|
return -EFAULT;
|
|
|
|
spin_lock_irqsave(&port->lock, flags);
|
|
ret = port->rs485_config(port, &rs485);
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (copy_to_user(rs485_user, &port->rs485, sizeof(port->rs485)))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Called via sys_ioctl. We can use spin_lock_irq() here.
|
|
*/
|
|
static int
|
|
uart_ioctl(struct tty_struct *tty, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
struct uart_state *state = tty->driver_data;
|
|
struct tty_port *port = &state->port;
|
|
void __user *uarg = (void __user *)arg;
|
|
int ret = -ENOIOCTLCMD;
|
|
|
|
|
|
/*
|
|
* These ioctls don't rely on the hardware to be present.
|
|
*/
|
|
switch (cmd) {
|
|
case TIOCGSERIAL:
|
|
ret = uart_get_info_user(port, uarg);
|
|
break;
|
|
|
|
case TIOCSSERIAL:
|
|
down_write(&tty->termios_rwsem);
|
|
ret = uart_set_info_user(tty, state, uarg);
|
|
up_write(&tty->termios_rwsem);
|
|
break;
|
|
|
|
case TIOCSERCONFIG:
|
|
down_write(&tty->termios_rwsem);
|
|
ret = uart_do_autoconfig(tty, state);
|
|
up_write(&tty->termios_rwsem);
|
|
break;
|
|
|
|
case TIOCSERGWILD: /* obsolete */
|
|
case TIOCSERSWILD: /* obsolete */
|
|
ret = 0;
|
|
break;
|
|
}
|
|
|
|
if (ret != -ENOIOCTLCMD)
|
|
goto out;
|
|
|
|
if (tty->flags & (1 << TTY_IO_ERROR)) {
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* The following should only be used when hardware is present.
|
|
*/
|
|
switch (cmd) {
|
|
case TIOCMIWAIT:
|
|
ret = uart_wait_modem_status(state, arg);
|
|
break;
|
|
}
|
|
|
|
if (ret != -ENOIOCTLCMD)
|
|
goto out;
|
|
|
|
mutex_lock(&port->mutex);
|
|
|
|
if (tty->flags & (1 << TTY_IO_ERROR)) {
|
|
ret = -EIO;
|
|
goto out_up;
|
|
}
|
|
|
|
/*
|
|
* All these rely on hardware being present and need to be
|
|
* protected against the tty being hung up.
|
|
*/
|
|
|
|
switch (cmd) {
|
|
case TIOCSERGETLSR: /* Get line status register */
|
|
ret = uart_get_lsr_info(tty, state, uarg);
|
|
break;
|
|
|
|
case TIOCGRS485:
|
|
ret = uart_get_rs485_config(state->uart_port, uarg);
|
|
break;
|
|
|
|
case TIOCSRS485:
|
|
ret = uart_set_rs485_config(state->uart_port, uarg);
|
|
break;
|
|
default: {
|
|
struct uart_port *uport = state->uart_port;
|
|
if (uport->ops->ioctl)
|
|
ret = uport->ops->ioctl(uport, cmd, arg);
|
|
break;
|
|
}
|
|
}
|
|
out_up:
|
|
mutex_unlock(&port->mutex);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static void uart_set_ldisc(struct tty_struct *tty)
|
|
{
|
|
struct uart_state *state = tty->driver_data;
|
|
struct uart_port *uport = state->uart_port;
|
|
|
|
if (uport->ops->set_ldisc) {
|
|
mutex_lock(&state->port.mutex);
|
|
uport->ops->set_ldisc(uport, &tty->termios);
|
|
mutex_unlock(&state->port.mutex);
|
|
}
|
|
}
|
|
|
|
static void uart_set_termios(struct tty_struct *tty,
|
|
struct ktermios *old_termios)
|
|
{
|
|
struct uart_state *state = tty->driver_data;
|
|
struct uart_port *uport = state->uart_port;
|
|
unsigned int cflag = tty->termios.c_cflag;
|
|
unsigned int iflag_mask = IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK;
|
|
bool sw_changed = false;
|
|
|
|
/*
|
|
* Drivers doing software flow control also need to know
|
|
* about changes to these input settings.
|
|
*/
|
|
if (uport->flags & UPF_SOFT_FLOW) {
|
|
iflag_mask |= IXANY|IXON|IXOFF;
|
|
sw_changed =
|
|
tty->termios.c_cc[VSTART] != old_termios->c_cc[VSTART] ||
|
|
tty->termios.c_cc[VSTOP] != old_termios->c_cc[VSTOP];
|
|
}
|
|
|
|
/*
|
|
* These are the bits that are used to setup various
|
|
* flags in the low level driver. We can ignore the Bfoo
|
|
* bits in c_cflag; c_[io]speed will always be set
|
|
* appropriately by set_termios() in tty_ioctl.c
|
|
*/
|
|
if ((cflag ^ old_termios->c_cflag) == 0 &&
|
|
tty->termios.c_ospeed == old_termios->c_ospeed &&
|
|
tty->termios.c_ispeed == old_termios->c_ispeed &&
|
|
((tty->termios.c_iflag ^ old_termios->c_iflag) & iflag_mask) == 0 &&
|
|
!sw_changed) {
|
|
return;
|
|
}
|
|
|
|
mutex_lock(&state->port.mutex);
|
|
uart_change_speed(tty, state, old_termios);
|
|
mutex_unlock(&state->port.mutex);
|
|
/* reload cflag from termios; port driver may have overriden flags */
|
|
cflag = tty->termios.c_cflag;
|
|
|
|
/* Handle transition to B0 status */
|
|
if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD))
|
|
uart_clear_mctrl(uport, TIOCM_RTS | TIOCM_DTR);
|
|
/* Handle transition away from B0 status */
|
|
else if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) {
|
|
unsigned int mask = TIOCM_DTR;
|
|
if (!(cflag & CRTSCTS) || !test_bit(TTY_THROTTLED, &tty->flags))
|
|
mask |= TIOCM_RTS;
|
|
uart_set_mctrl(uport, mask);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Calls to uart_close() are serialised via the tty_lock in
|
|
* drivers/tty/tty_io.c:tty_release()
|
|
* drivers/tty/tty_io.c:do_tty_hangup()
|
|
* This runs from a workqueue and can sleep for a _short_ time only.
|
|
*/
|
|
static void uart_close(struct tty_struct *tty, struct file *filp)
|
|
{
|
|
struct uart_state *state = tty->driver_data;
|
|
struct tty_port *port;
|
|
struct uart_port *uport;
|
|
unsigned long flags;
|
|
|
|
if (!state) {
|
|
struct uart_driver *drv = tty->driver->driver_state;
|
|
|
|
state = drv->state + tty->index;
|
|
port = &state->port;
|
|
spin_lock_irq(&port->lock);
|
|
--port->count;
|
|
spin_unlock_irq(&port->lock);
|
|
return;
|
|
}
|
|
|
|
uport = state->uart_port;
|
|
port = &state->port;
|
|
|
|
pr_debug("uart_close(%d) called\n", uport ? uport->line : -1);
|
|
|
|
if (!port->count || tty_port_close_start(port, tty, filp) == 0)
|
|
return;
|
|
|
|
/*
|
|
* At this point, we stop accepting input. To do this, we
|
|
* disable the receive line status interrupts.
|
|
*/
|
|
if (port->flags & ASYNC_INITIALIZED) {
|
|
unsigned long flags;
|
|
spin_lock_irqsave(&uport->lock, flags);
|
|
uport->ops->stop_rx(uport);
|
|
spin_unlock_irqrestore(&uport->lock, flags);
|
|
/*
|
|
* Before we drop DTR, make sure the UART transmitter
|
|
* has completely drained; this is especially
|
|
* important if there is a transmit FIFO!
|
|
*/
|
|
uart_wait_until_sent(tty, uport->timeout);
|
|
}
|
|
|
|
mutex_lock(&port->mutex);
|
|
uart_shutdown(tty, state);
|
|
tty_port_tty_set(port, NULL);
|
|
tty->closing = 0;
|
|
spin_lock_irqsave(&port->lock, flags);
|
|
|
|
if (port->blocked_open) {
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
if (port->close_delay)
|
|
msleep_interruptible(jiffies_to_msecs(port->close_delay));
|
|
spin_lock_irqsave(&port->lock, flags);
|
|
} else if (!uart_console(uport)) {
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
uart_change_pm(state, UART_PM_STATE_OFF);
|
|
spin_lock_irqsave(&port->lock, flags);
|
|
}
|
|
|
|
/*
|
|
* Wake up anyone trying to open this port.
|
|
*/
|
|
clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags);
|
|
clear_bit(ASYNCB_CLOSING, &port->flags);
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
wake_up_interruptible(&port->open_wait);
|
|
wake_up_interruptible(&port->close_wait);
|
|
|
|
mutex_unlock(&port->mutex);
|
|
|
|
tty_ldisc_flush(tty);
|
|
}
|
|
|
|
static void uart_wait_until_sent(struct tty_struct *tty, int timeout)
|
|
{
|
|
struct uart_state *state = tty->driver_data;
|
|
struct uart_port *port = state->uart_port;
|
|
unsigned long char_time, expire;
|
|
|
|
if (port->type == PORT_UNKNOWN || port->fifosize == 0)
|
|
return;
|
|
|
|
/*
|
|
* Set the check interval to be 1/5 of the estimated time to
|
|
* send a single character, and make it at least 1. The check
|
|
* interval should also be less than the timeout.
|
|
*
|
|
* Note: we have to use pretty tight timings here to satisfy
|
|
* the NIST-PCTS.
|
|
*/
|
|
char_time = (port->timeout - HZ/50) / port->fifosize;
|
|
char_time = char_time / 5;
|
|
if (char_time == 0)
|
|
char_time = 1;
|
|
if (timeout && timeout < char_time)
|
|
char_time = timeout;
|
|
|
|
/*
|
|
* If the transmitter hasn't cleared in twice the approximate
|
|
* amount of time to send the entire FIFO, it probably won't
|
|
* ever clear. This assumes the UART isn't doing flow
|
|
* control, which is currently the case. Hence, if it ever
|
|
* takes longer than port->timeout, this is probably due to a
|
|
* UART bug of some kind. So, we clamp the timeout parameter at
|
|
* 2*port->timeout.
|
|
*/
|
|
if (timeout == 0 || timeout > 2 * port->timeout)
|
|
timeout = 2 * port->timeout;
|
|
|
|
expire = jiffies + timeout;
|
|
|
|
pr_debug("uart_wait_until_sent(%d), jiffies=%lu, expire=%lu...\n",
|
|
port->line, jiffies, expire);
|
|
|
|
/*
|
|
* Check whether the transmitter is empty every 'char_time'.
|
|
* 'timeout' / 'expire' give us the maximum amount of time
|
|
* we wait.
|
|
*/
|
|
while (!port->ops->tx_empty(port)) {
|
|
msleep_interruptible(jiffies_to_msecs(char_time));
|
|
if (signal_pending(current))
|
|
break;
|
|
if (time_after(jiffies, expire))
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Calls to uart_hangup() are serialised by the tty_lock in
|
|
* drivers/tty/tty_io.c:do_tty_hangup()
|
|
* This runs from a workqueue and can sleep for a _short_ time only.
|
|
*/
|
|
static void uart_hangup(struct tty_struct *tty)
|
|
{
|
|
struct uart_state *state = tty->driver_data;
|
|
struct tty_port *port = &state->port;
|
|
unsigned long flags;
|
|
|
|
pr_debug("uart_hangup(%d)\n", state->uart_port->line);
|
|
|
|
mutex_lock(&port->mutex);
|
|
if (port->flags & ASYNC_NORMAL_ACTIVE) {
|
|
uart_flush_buffer(tty);
|
|
uart_shutdown(tty, state);
|
|
spin_lock_irqsave(&port->lock, flags);
|
|
port->count = 0;
|
|
clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags);
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
tty_port_tty_set(port, NULL);
|
|
if (!uart_console(state->uart_port))
|
|
uart_change_pm(state, UART_PM_STATE_OFF);
|
|
wake_up_interruptible(&port->open_wait);
|
|
wake_up_interruptible(&port->delta_msr_wait);
|
|
}
|
|
mutex_unlock(&port->mutex);
|
|
}
|
|
|
|
static int uart_port_activate(struct tty_port *port, struct tty_struct *tty)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void uart_port_shutdown(struct tty_port *port)
|
|
{
|
|
struct uart_state *state = container_of(port, struct uart_state, port);
|
|
struct uart_port *uport = state->uart_port;
|
|
|
|
/*
|
|
* clear delta_msr_wait queue to avoid mem leaks: we may free
|
|
* the irq here so the queue might never be woken up. Note
|
|
* that we won't end up waiting on delta_msr_wait again since
|
|
* any outstanding file descriptors should be pointing at
|
|
* hung_up_tty_fops now.
|
|
*/
|
|
wake_up_interruptible(&port->delta_msr_wait);
|
|
|
|
/*
|
|
* Free the IRQ and disable the port.
|
|
*/
|
|
uport->ops->shutdown(uport);
|
|
|
|
/*
|
|
* Ensure that the IRQ handler isn't running on another CPU.
|
|
*/
|
|
synchronize_irq(uport->irq);
|
|
}
|
|
|
|
static int uart_carrier_raised(struct tty_port *port)
|
|
{
|
|
struct uart_state *state = container_of(port, struct uart_state, port);
|
|
struct uart_port *uport = state->uart_port;
|
|
int mctrl;
|
|
spin_lock_irq(&uport->lock);
|
|
uart_enable_ms(uport);
|
|
mctrl = uport->ops->get_mctrl(uport);
|
|
spin_unlock_irq(&uport->lock);
|
|
if (mctrl & TIOCM_CAR)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static void uart_dtr_rts(struct tty_port *port, int onoff)
|
|
{
|
|
struct uart_state *state = container_of(port, struct uart_state, port);
|
|
struct uart_port *uport = state->uart_port;
|
|
|
|
if (onoff)
|
|
uart_set_mctrl(uport, TIOCM_DTR | TIOCM_RTS);
|
|
else
|
|
uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS);
|
|
}
|
|
|
|
/*
|
|
* Calls to uart_open are serialised by the tty_lock in
|
|
* drivers/tty/tty_io.c:tty_open()
|
|
* Note that if this fails, then uart_close() _will_ be called.
|
|
*
|
|
* In time, we want to scrap the "opening nonpresent ports"
|
|
* behaviour and implement an alternative way for setserial
|
|
* to set base addresses/ports/types. This will allow us to
|
|
* get rid of a certain amount of extra tests.
|
|
*/
|
|
static int uart_open(struct tty_struct *tty, struct file *filp)
|
|
{
|
|
struct uart_driver *drv = (struct uart_driver *)tty->driver->driver_state;
|
|
int retval, line = tty->index;
|
|
struct uart_state *state = drv->state + line;
|
|
struct tty_port *port = &state->port;
|
|
|
|
pr_debug("uart_open(%d) called\n", line);
|
|
|
|
spin_lock_irq(&port->lock);
|
|
++port->count;
|
|
spin_unlock_irq(&port->lock);
|
|
|
|
/*
|
|
* We take the semaphore here to guarantee that we won't be re-entered
|
|
* while allocating the state structure, or while we request any IRQs
|
|
* that the driver may need. This also has the nice side-effect that
|
|
* it delays the action of uart_hangup, so we can guarantee that
|
|
* state->port.tty will always contain something reasonable.
|
|
*/
|
|
if (mutex_lock_interruptible(&port->mutex)) {
|
|
retval = -ERESTARTSYS;
|
|
goto end;
|
|
}
|
|
|
|
if (!state->uart_port || state->uart_port->flags & UPF_DEAD) {
|
|
retval = -ENXIO;
|
|
goto err_unlock;
|
|
}
|
|
|
|
tty->driver_data = state;
|
|
state->uart_port->state = state;
|
|
state->port.low_latency =
|
|
(state->uart_port->flags & UPF_LOW_LATENCY) ? 1 : 0;
|
|
tty_port_tty_set(port, tty);
|
|
|
|
/*
|
|
* Start up the serial port.
|
|
*/
|
|
retval = uart_startup(tty, state, 0);
|
|
|
|
/*
|
|
* If we succeeded, wait until the port is ready.
|
|
*/
|
|
mutex_unlock(&port->mutex);
|
|
if (retval == 0)
|
|
retval = tty_port_block_til_ready(port, tty, filp);
|
|
|
|
end:
|
|
return retval;
|
|
err_unlock:
|
|
mutex_unlock(&port->mutex);
|
|
goto end;
|
|
}
|
|
|
|
static const char *uart_type(struct uart_port *port)
|
|
{
|
|
const char *str = NULL;
|
|
|
|
if (port->ops->type)
|
|
str = port->ops->type(port);
|
|
|
|
if (!str)
|
|
str = "unknown";
|
|
|
|
return str;
|
|
}
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
|
|
static void uart_line_info(struct seq_file *m, struct uart_driver *drv, int i)
|
|
{
|
|
struct uart_state *state = drv->state + i;
|
|
struct tty_port *port = &state->port;
|
|
enum uart_pm_state pm_state;
|
|
struct uart_port *uport = state->uart_port;
|
|
char stat_buf[32];
|
|
unsigned int status;
|
|
int mmio;
|
|
|
|
if (!uport)
|
|
return;
|
|
|
|
mmio = uport->iotype >= UPIO_MEM;
|
|
seq_printf(m, "%d: uart:%s %s%08llX irq:%d",
|
|
uport->line, uart_type(uport),
|
|
mmio ? "mmio:0x" : "port:",
|
|
mmio ? (unsigned long long)uport->mapbase
|
|
: (unsigned long long)uport->iobase,
|
|
uport->irq);
|
|
|
|
if (uport->type == PORT_UNKNOWN) {
|
|
seq_putc(m, '\n');
|
|
return;
|
|
}
|
|
|
|
if (capable(CAP_SYS_ADMIN)) {
|
|
mutex_lock(&port->mutex);
|
|
pm_state = state->pm_state;
|
|
if (pm_state != UART_PM_STATE_ON)
|
|
uart_change_pm(state, UART_PM_STATE_ON);
|
|
spin_lock_irq(&uport->lock);
|
|
status = uport->ops->get_mctrl(uport);
|
|
spin_unlock_irq(&uport->lock);
|
|
if (pm_state != UART_PM_STATE_ON)
|
|
uart_change_pm(state, pm_state);
|
|
mutex_unlock(&port->mutex);
|
|
|
|
seq_printf(m, " tx:%d rx:%d",
|
|
uport->icount.tx, uport->icount.rx);
|
|
if (uport->icount.frame)
|
|
seq_printf(m, " fe:%d",
|
|
uport->icount.frame);
|
|
if (uport->icount.parity)
|
|
seq_printf(m, " pe:%d",
|
|
uport->icount.parity);
|
|
if (uport->icount.brk)
|
|
seq_printf(m, " brk:%d",
|
|
uport->icount.brk);
|
|
if (uport->icount.overrun)
|
|
seq_printf(m, " oe:%d",
|
|
uport->icount.overrun);
|
|
|
|
#define INFOBIT(bit, str) \
|
|
if (uport->mctrl & (bit)) \
|
|
strncat(stat_buf, (str), sizeof(stat_buf) - \
|
|
strlen(stat_buf) - 2)
|
|
#define STATBIT(bit, str) \
|
|
if (status & (bit)) \
|
|
strncat(stat_buf, (str), sizeof(stat_buf) - \
|
|
strlen(stat_buf) - 2)
|
|
|
|
stat_buf[0] = '\0';
|
|
stat_buf[1] = '\0';
|
|
INFOBIT(TIOCM_RTS, "|RTS");
|
|
STATBIT(TIOCM_CTS, "|CTS");
|
|
INFOBIT(TIOCM_DTR, "|DTR");
|
|
STATBIT(TIOCM_DSR, "|DSR");
|
|
STATBIT(TIOCM_CAR, "|CD");
|
|
STATBIT(TIOCM_RNG, "|RI");
|
|
if (stat_buf[0])
|
|
stat_buf[0] = ' ';
|
|
|
|
seq_puts(m, stat_buf);
|
|
}
|
|
seq_putc(m, '\n');
|
|
#undef STATBIT
|
|
#undef INFOBIT
|
|
}
|
|
|
|
static int uart_proc_show(struct seq_file *m, void *v)
|
|
{
|
|
struct tty_driver *ttydrv = m->private;
|
|
struct uart_driver *drv = ttydrv->driver_state;
|
|
int i;
|
|
|
|
seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n",
|
|
"", "", "");
|
|
for (i = 0; i < drv->nr; i++)
|
|
uart_line_info(m, drv, i);
|
|
return 0;
|
|
}
|
|
|
|
static int uart_proc_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, uart_proc_show, PDE_DATA(inode));
|
|
}
|
|
|
|
static const struct file_operations uart_proc_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = uart_proc_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
#endif
|
|
|
|
#if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL)
|
|
/**
|
|
* uart_console_write - write a console message to a serial port
|
|
* @port: the port to write the message
|
|
* @s: array of characters
|
|
* @count: number of characters in string to write
|
|
* @putchar: function to write character to port
|
|
*/
|
|
void uart_console_write(struct uart_port *port, const char *s,
|
|
unsigned int count,
|
|
void (*putchar)(struct uart_port *, int))
|
|
{
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < count; i++, s++) {
|
|
if (*s == '\n')
|
|
putchar(port, '\r');
|
|
putchar(port, *s);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(uart_console_write);
|
|
|
|
/*
|
|
* Check whether an invalid uart number has been specified, and
|
|
* if so, search for the first available port that does have
|
|
* console support.
|
|
*/
|
|
struct uart_port * __init
|
|
uart_get_console(struct uart_port *ports, int nr, struct console *co)
|
|
{
|
|
int idx = co->index;
|
|
|
|
if (idx < 0 || idx >= nr || (ports[idx].iobase == 0 &&
|
|
ports[idx].membase == NULL))
|
|
for (idx = 0; idx < nr; idx++)
|
|
if (ports[idx].iobase != 0 ||
|
|
ports[idx].membase != NULL)
|
|
break;
|
|
|
|
co->index = idx;
|
|
|
|
return ports + idx;
|
|
}
|
|
|
|
/**
|
|
* uart_parse_earlycon - Parse earlycon options
|
|
* @p: ptr to 2nd field (ie., just beyond '<name>,')
|
|
* @iotype: ptr for decoded iotype (out)
|
|
* @addr: ptr for decoded mapbase/iobase (out)
|
|
* @options: ptr for <options> field; NULL if not present (out)
|
|
*
|
|
* Decodes earlycon kernel command line parameters of the form
|
|
* earlycon=<name>,io|mmio|mmio32,<addr>,<options>
|
|
* console=<name>,io|mmio|mmio32,<addr>,<options>
|
|
*
|
|
* The optional form
|
|
* earlycon=<name>,0x<addr>,<options>
|
|
* console=<name>,0x<addr>,<options>
|
|
* is also accepted; the returned @iotype will be UPIO_MEM.
|
|
*
|
|
* Returns 0 on success or -EINVAL on failure
|
|
*/
|
|
int uart_parse_earlycon(char *p, unsigned char *iotype, unsigned long *addr,
|
|
char **options)
|
|
{
|
|
if (strncmp(p, "mmio,", 5) == 0) {
|
|
*iotype = UPIO_MEM;
|
|
p += 5;
|
|
} else if (strncmp(p, "mmio32,", 7) == 0) {
|
|
*iotype = UPIO_MEM32;
|
|
p += 7;
|
|
} else if (strncmp(p, "io,", 3) == 0) {
|
|
*iotype = UPIO_PORT;
|
|
p += 3;
|
|
} else if (strncmp(p, "0x", 2) == 0) {
|
|
*iotype = UPIO_MEM;
|
|
} else {
|
|
return -EINVAL;
|
|
}
|
|
|
|
*addr = simple_strtoul(p, NULL, 0);
|
|
p = strchr(p, ',');
|
|
if (p)
|
|
p++;
|
|
|
|
*options = p;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(uart_parse_earlycon);
|
|
|
|
/**
|
|
* uart_parse_options - Parse serial port baud/parity/bits/flow control.
|
|
* @options: pointer to option string
|
|
* @baud: pointer to an 'int' variable for the baud rate.
|
|
* @parity: pointer to an 'int' variable for the parity.
|
|
* @bits: pointer to an 'int' variable for the number of data bits.
|
|
* @flow: pointer to an 'int' variable for the flow control character.
|
|
*
|
|
* uart_parse_options decodes a string containing the serial console
|
|
* options. The format of the string is <baud><parity><bits><flow>,
|
|
* eg: 115200n8r
|
|
*/
|
|
void
|
|
uart_parse_options(char *options, int *baud, int *parity, int *bits, int *flow)
|
|
{
|
|
char *s = options;
|
|
|
|
*baud = simple_strtoul(s, NULL, 10);
|
|
while (*s >= '0' && *s <= '9')
|
|
s++;
|
|
if (*s)
|
|
*parity = *s++;
|
|
if (*s)
|
|
*bits = *s++ - '0';
|
|
if (*s)
|
|
*flow = *s;
|
|
}
|
|
EXPORT_SYMBOL_GPL(uart_parse_options);
|
|
|
|
struct baud_rates {
|
|
unsigned int rate;
|
|
unsigned int cflag;
|
|
};
|
|
|
|
static const struct baud_rates baud_rates[] = {
|
|
{ 921600, B921600 },
|
|
{ 460800, B460800 },
|
|
{ 230400, B230400 },
|
|
{ 115200, B115200 },
|
|
{ 57600, B57600 },
|
|
{ 38400, B38400 },
|
|
{ 19200, B19200 },
|
|
{ 9600, B9600 },
|
|
{ 4800, B4800 },
|
|
{ 2400, B2400 },
|
|
{ 1200, B1200 },
|
|
{ 0, B38400 }
|
|
};
|
|
|
|
/**
|
|
* uart_set_options - setup the serial console parameters
|
|
* @port: pointer to the serial ports uart_port structure
|
|
* @co: console pointer
|
|
* @baud: baud rate
|
|
* @parity: parity character - 'n' (none), 'o' (odd), 'e' (even)
|
|
* @bits: number of data bits
|
|
* @flow: flow control character - 'r' (rts)
|
|
*/
|
|
int
|
|
uart_set_options(struct uart_port *port, struct console *co,
|
|
int baud, int parity, int bits, int flow)
|
|
{
|
|
struct ktermios termios;
|
|
static struct ktermios dummy;
|
|
int i;
|
|
|
|
/*
|
|
* Ensure that the serial console lock is initialised
|
|
* early.
|
|
* If this port is a console, then the spinlock is already
|
|
* initialised.
|
|
*/
|
|
if (!(uart_console(port) && (port->cons->flags & CON_ENABLED))) {
|
|
spin_lock_init(&port->lock);
|
|
lockdep_set_class(&port->lock, &port_lock_key);
|
|
}
|
|
|
|
memset(&termios, 0, sizeof(struct ktermios));
|
|
|
|
termios.c_cflag = CREAD | HUPCL | CLOCAL;
|
|
|
|
/*
|
|
* Construct a cflag setting.
|
|
*/
|
|
for (i = 0; baud_rates[i].rate; i++)
|
|
if (baud_rates[i].rate <= baud)
|
|
break;
|
|
|
|
termios.c_cflag |= baud_rates[i].cflag;
|
|
|
|
if (bits == 7)
|
|
termios.c_cflag |= CS7;
|
|
else
|
|
termios.c_cflag |= CS8;
|
|
|
|
switch (parity) {
|
|
case 'o': case 'O':
|
|
termios.c_cflag |= PARODD;
|
|
/*fall through*/
|
|
case 'e': case 'E':
|
|
termios.c_cflag |= PARENB;
|
|
break;
|
|
}
|
|
|
|
if (flow == 'r')
|
|
termios.c_cflag |= CRTSCTS;
|
|
|
|
/*
|
|
* some uarts on other side don't support no flow control.
|
|
* So we set * DTR in host uart to make them happy
|
|
*/
|
|
port->mctrl |= TIOCM_DTR;
|
|
|
|
port->ops->set_termios(port, &termios, &dummy);
|
|
/*
|
|
* Allow the setting of the UART parameters with a NULL console
|
|
* too:
|
|
*/
|
|
if (co)
|
|
co->cflag = termios.c_cflag;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(uart_set_options);
|
|
#endif /* CONFIG_SERIAL_CORE_CONSOLE */
|
|
|
|
/**
|
|
* uart_change_pm - set power state of the port
|
|
*
|
|
* @state: port descriptor
|
|
* @pm_state: new state
|
|
*
|
|
* Locking: port->mutex has to be held
|
|
*/
|
|
static void uart_change_pm(struct uart_state *state,
|
|
enum uart_pm_state pm_state)
|
|
{
|
|
struct uart_port *port = state->uart_port;
|
|
|
|
if (state->pm_state != pm_state) {
|
|
if (port->ops->pm)
|
|
port->ops->pm(port, pm_state, state->pm_state);
|
|
state->pm_state = pm_state;
|
|
}
|
|
}
|
|
|
|
struct uart_match {
|
|
struct uart_port *port;
|
|
struct uart_driver *driver;
|
|
};
|
|
|
|
static int serial_match_port(struct device *dev, void *data)
|
|
{
|
|
struct uart_match *match = data;
|
|
struct tty_driver *tty_drv = match->driver->tty_driver;
|
|
dev_t devt = MKDEV(tty_drv->major, tty_drv->minor_start) +
|
|
match->port->line;
|
|
|
|
return dev->devt == devt; /* Actually, only one tty per port */
|
|
}
|
|
|
|
int uart_suspend_port(struct uart_driver *drv, struct uart_port *uport)
|
|
{
|
|
struct uart_state *state = drv->state + uport->line;
|
|
struct tty_port *port = &state->port;
|
|
struct device *tty_dev;
|
|
struct uart_match match = {uport, drv};
|
|
|
|
mutex_lock(&port->mutex);
|
|
|
|
tty_dev = device_find_child(uport->dev, &match, serial_match_port);
|
|
if (device_may_wakeup(tty_dev)) {
|
|
if (!enable_irq_wake(uport->irq))
|
|
uport->irq_wake = 1;
|
|
put_device(tty_dev);
|
|
mutex_unlock(&port->mutex);
|
|
return 0;
|
|
}
|
|
put_device(tty_dev);
|
|
|
|
/* Nothing to do if the console is not suspending */
|
|
if (!console_suspend_enabled && uart_console(uport))
|
|
goto unlock;
|
|
|
|
uport->suspended = 1;
|
|
|
|
if (port->flags & ASYNC_INITIALIZED) {
|
|
const struct uart_ops *ops = uport->ops;
|
|
int tries;
|
|
|
|
set_bit(ASYNCB_SUSPENDED, &port->flags);
|
|
clear_bit(ASYNCB_INITIALIZED, &port->flags);
|
|
|
|
spin_lock_irq(&uport->lock);
|
|
ops->stop_tx(uport);
|
|
ops->set_mctrl(uport, 0);
|
|
ops->stop_rx(uport);
|
|
spin_unlock_irq(&uport->lock);
|
|
|
|
/*
|
|
* Wait for the transmitter to empty.
|
|
*/
|
|
for (tries = 3; !ops->tx_empty(uport) && tries; tries--)
|
|
msleep(10);
|
|
if (!tries)
|
|
dev_err(uport->dev, "%s%d: Unable to drain transmitter\n",
|
|
drv->dev_name,
|
|
drv->tty_driver->name_base + uport->line);
|
|
|
|
ops->shutdown(uport);
|
|
}
|
|
|
|
/*
|
|
* Disable the console device before suspending.
|
|
*/
|
|
if (uart_console(uport))
|
|
console_stop(uport->cons);
|
|
|
|
uart_change_pm(state, UART_PM_STATE_OFF);
|
|
unlock:
|
|
mutex_unlock(&port->mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int uart_resume_port(struct uart_driver *drv, struct uart_port *uport)
|
|
{
|
|
struct uart_state *state = drv->state + uport->line;
|
|
struct tty_port *port = &state->port;
|
|
struct device *tty_dev;
|
|
struct uart_match match = {uport, drv};
|
|
struct ktermios termios;
|
|
|
|
mutex_lock(&port->mutex);
|
|
|
|
tty_dev = device_find_child(uport->dev, &match, serial_match_port);
|
|
if (!uport->suspended && device_may_wakeup(tty_dev)) {
|
|
if (uport->irq_wake) {
|
|
disable_irq_wake(uport->irq);
|
|
uport->irq_wake = 0;
|
|
}
|
|
put_device(tty_dev);
|
|
mutex_unlock(&port->mutex);
|
|
return 0;
|
|
}
|
|
put_device(tty_dev);
|
|
uport->suspended = 0;
|
|
|
|
/*
|
|
* Re-enable the console device after suspending.
|
|
*/
|
|
if (uart_console(uport)) {
|
|
/*
|
|
* First try to use the console cflag setting.
|
|
*/
|
|
memset(&termios, 0, sizeof(struct ktermios));
|
|
termios.c_cflag = uport->cons->cflag;
|
|
|
|
/*
|
|
* If that's unset, use the tty termios setting.
|
|
*/
|
|
if (port->tty && termios.c_cflag == 0)
|
|
termios = port->tty->termios;
|
|
|
|
if (console_suspend_enabled)
|
|
uart_change_pm(state, UART_PM_STATE_ON);
|
|
uport->ops->set_termios(uport, &termios, NULL);
|
|
if (console_suspend_enabled)
|
|
console_start(uport->cons);
|
|
}
|
|
|
|
if (port->flags & ASYNC_SUSPENDED) {
|
|
const struct uart_ops *ops = uport->ops;
|
|
int ret;
|
|
|
|
uart_change_pm(state, UART_PM_STATE_ON);
|
|
spin_lock_irq(&uport->lock);
|
|
ops->set_mctrl(uport, 0);
|
|
spin_unlock_irq(&uport->lock);
|
|
if (console_suspend_enabled || !uart_console(uport)) {
|
|
/* Protected by port mutex for now */
|
|
struct tty_struct *tty = port->tty;
|
|
ret = ops->startup(uport);
|
|
if (ret == 0) {
|
|
if (tty)
|
|
uart_change_speed(tty, state, NULL);
|
|
spin_lock_irq(&uport->lock);
|
|
ops->set_mctrl(uport, uport->mctrl);
|
|
ops->start_tx(uport);
|
|
spin_unlock_irq(&uport->lock);
|
|
set_bit(ASYNCB_INITIALIZED, &port->flags);
|
|
} else {
|
|
/*
|
|
* Failed to resume - maybe hardware went away?
|
|
* Clear the "initialized" flag so we won't try
|
|
* to call the low level drivers shutdown method.
|
|
*/
|
|
uart_shutdown(tty, state);
|
|
}
|
|
}
|
|
|
|
clear_bit(ASYNCB_SUSPENDED, &port->flags);
|
|
}
|
|
|
|
mutex_unlock(&port->mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline void
|
|
uart_report_port(struct uart_driver *drv, struct uart_port *port)
|
|
{
|
|
char address[64];
|
|
|
|
switch (port->iotype) {
|
|
case UPIO_PORT:
|
|
snprintf(address, sizeof(address), "I/O 0x%lx", port->iobase);
|
|
break;
|
|
case UPIO_HUB6:
|
|
snprintf(address, sizeof(address),
|
|
"I/O 0x%lx offset 0x%x", port->iobase, port->hub6);
|
|
break;
|
|
case UPIO_MEM:
|
|
case UPIO_MEM32:
|
|
case UPIO_MEM32BE:
|
|
case UPIO_AU:
|
|
case UPIO_TSI:
|
|
snprintf(address, sizeof(address),
|
|
"MMIO 0x%llx", (unsigned long long)port->mapbase);
|
|
break;
|
|
default:
|
|
strlcpy(address, "*unknown*", sizeof(address));
|
|
break;
|
|
}
|
|
|
|
printk(KERN_INFO "%s%s%s%d at %s (irq = %d, base_baud = %d) is a %s\n",
|
|
port->dev ? dev_name(port->dev) : "",
|
|
port->dev ? ": " : "",
|
|
drv->dev_name,
|
|
drv->tty_driver->name_base + port->line,
|
|
address, port->irq, port->uartclk / 16, uart_type(port));
|
|
}
|
|
|
|
static void
|
|
uart_configure_port(struct uart_driver *drv, struct uart_state *state,
|
|
struct uart_port *port)
|
|
{
|
|
unsigned int flags;
|
|
|
|
/*
|
|
* If there isn't a port here, don't do anything further.
|
|
*/
|
|
if (!port->iobase && !port->mapbase && !port->membase)
|
|
return;
|
|
|
|
/*
|
|
* Now do the auto configuration stuff. Note that config_port
|
|
* is expected to claim the resources and map the port for us.
|
|
*/
|
|
flags = 0;
|
|
if (port->flags & UPF_AUTO_IRQ)
|
|
flags |= UART_CONFIG_IRQ;
|
|
if (port->flags & UPF_BOOT_AUTOCONF) {
|
|
if (!(port->flags & UPF_FIXED_TYPE)) {
|
|
port->type = PORT_UNKNOWN;
|
|
flags |= UART_CONFIG_TYPE;
|
|
}
|
|
port->ops->config_port(port, flags);
|
|
}
|
|
|
|
if (port->type != PORT_UNKNOWN) {
|
|
unsigned long flags;
|
|
|
|
uart_report_port(drv, port);
|
|
|
|
/* Power up port for set_mctrl() */
|
|
uart_change_pm(state, UART_PM_STATE_ON);
|
|
|
|
/*
|
|
* Ensure that the modem control lines are de-activated.
|
|
* keep the DTR setting that is set in uart_set_options()
|
|
* We probably don't need a spinlock around this, but
|
|
*/
|
|
spin_lock_irqsave(&port->lock, flags);
|
|
port->ops->set_mctrl(port, port->mctrl & TIOCM_DTR);
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
|
|
/*
|
|
* If this driver supports console, and it hasn't been
|
|
* successfully registered yet, try to re-register it.
|
|
* It may be that the port was not available.
|
|
*/
|
|
if (port->cons && !(port->cons->flags & CON_ENABLED))
|
|
register_console(port->cons);
|
|
|
|
/*
|
|
* Power down all ports by default, except the
|
|
* console if we have one.
|
|
*/
|
|
if (!uart_console(port))
|
|
uart_change_pm(state, UART_PM_STATE_OFF);
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_CONSOLE_POLL
|
|
|
|
static int uart_poll_init(struct tty_driver *driver, int line, char *options)
|
|
{
|
|
struct uart_driver *drv = driver->driver_state;
|
|
struct uart_state *state = drv->state + line;
|
|
struct uart_port *port;
|
|
int baud = 9600;
|
|
int bits = 8;
|
|
int parity = 'n';
|
|
int flow = 'n';
|
|
int ret;
|
|
|
|
if (!state || !state->uart_port)
|
|
return -1;
|
|
|
|
port = state->uart_port;
|
|
if (!(port->ops->poll_get_char && port->ops->poll_put_char))
|
|
return -1;
|
|
|
|
if (port->ops->poll_init) {
|
|
struct tty_port *tport = &state->port;
|
|
|
|
ret = 0;
|
|
mutex_lock(&tport->mutex);
|
|
/*
|
|
* We don't set ASYNCB_INITIALIZED as we only initialized the
|
|
* hw, e.g. state->xmit is still uninitialized.
|
|
*/
|
|
if (!test_bit(ASYNCB_INITIALIZED, &tport->flags))
|
|
ret = port->ops->poll_init(port);
|
|
mutex_unlock(&tport->mutex);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
if (options) {
|
|
uart_parse_options(options, &baud, &parity, &bits, &flow);
|
|
return uart_set_options(port, NULL, baud, parity, bits, flow);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int uart_poll_get_char(struct tty_driver *driver, int line)
|
|
{
|
|
struct uart_driver *drv = driver->driver_state;
|
|
struct uart_state *state = drv->state + line;
|
|
struct uart_port *port;
|
|
|
|
if (!state || !state->uart_port)
|
|
return -1;
|
|
|
|
port = state->uart_port;
|
|
return port->ops->poll_get_char(port);
|
|
}
|
|
|
|
static void uart_poll_put_char(struct tty_driver *driver, int line, char ch)
|
|
{
|
|
struct uart_driver *drv = driver->driver_state;
|
|
struct uart_state *state = drv->state + line;
|
|
struct uart_port *port;
|
|
|
|
if (!state || !state->uart_port)
|
|
return;
|
|
|
|
port = state->uart_port;
|
|
|
|
if (ch == '\n')
|
|
port->ops->poll_put_char(port, '\r');
|
|
port->ops->poll_put_char(port, ch);
|
|
}
|
|
#endif
|
|
|
|
static const struct tty_operations uart_ops = {
|
|
.open = uart_open,
|
|
.close = uart_close,
|
|
.write = uart_write,
|
|
.put_char = uart_put_char,
|
|
.flush_chars = uart_flush_chars,
|
|
.write_room = uart_write_room,
|
|
.chars_in_buffer= uart_chars_in_buffer,
|
|
.flush_buffer = uart_flush_buffer,
|
|
.ioctl = uart_ioctl,
|
|
.throttle = uart_throttle,
|
|
.unthrottle = uart_unthrottle,
|
|
.send_xchar = uart_send_xchar,
|
|
.set_termios = uart_set_termios,
|
|
.set_ldisc = uart_set_ldisc,
|
|
.stop = uart_stop,
|
|
.start = uart_start,
|
|
.hangup = uart_hangup,
|
|
.break_ctl = uart_break_ctl,
|
|
.wait_until_sent= uart_wait_until_sent,
|
|
#ifdef CONFIG_PROC_FS
|
|
.proc_fops = &uart_proc_fops,
|
|
#endif
|
|
.tiocmget = uart_tiocmget,
|
|
.tiocmset = uart_tiocmset,
|
|
.get_icount = uart_get_icount,
|
|
#ifdef CONFIG_CONSOLE_POLL
|
|
.poll_init = uart_poll_init,
|
|
.poll_get_char = uart_poll_get_char,
|
|
.poll_put_char = uart_poll_put_char,
|
|
#endif
|
|
};
|
|
|
|
static const struct tty_port_operations uart_port_ops = {
|
|
.activate = uart_port_activate,
|
|
.shutdown = uart_port_shutdown,
|
|
.carrier_raised = uart_carrier_raised,
|
|
.dtr_rts = uart_dtr_rts,
|
|
};
|
|
|
|
/**
|
|
* uart_register_driver - register a driver with the uart core layer
|
|
* @drv: low level driver structure
|
|
*
|
|
* Register a uart driver with the core driver. We in turn register
|
|
* with the tty layer, and initialise the core driver per-port state.
|
|
*
|
|
* We have a proc file in /proc/tty/driver which is named after the
|
|
* normal driver.
|
|
*
|
|
* drv->port should be NULL, and the per-port structures should be
|
|
* registered using uart_add_one_port after this call has succeeded.
|
|
*/
|
|
int uart_register_driver(struct uart_driver *drv)
|
|
{
|
|
struct tty_driver *normal;
|
|
int i, retval;
|
|
|
|
BUG_ON(drv->state);
|
|
|
|
/*
|
|
* Maybe we should be using a slab cache for this, especially if
|
|
* we have a large number of ports to handle.
|
|
*/
|
|
drv->state = kzalloc(sizeof(struct uart_state) * drv->nr, GFP_KERNEL);
|
|
if (!drv->state)
|
|
goto out;
|
|
|
|
normal = alloc_tty_driver(drv->nr);
|
|
if (!normal)
|
|
goto out_kfree;
|
|
|
|
drv->tty_driver = normal;
|
|
|
|
normal->driver_name = drv->driver_name;
|
|
normal->name = drv->dev_name;
|
|
normal->major = drv->major;
|
|
normal->minor_start = drv->minor;
|
|
normal->type = TTY_DRIVER_TYPE_SERIAL;
|
|
normal->subtype = SERIAL_TYPE_NORMAL;
|
|
normal->init_termios = tty_std_termios;
|
|
normal->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
|
|
normal->init_termios.c_ispeed = normal->init_termios.c_ospeed = 9600;
|
|
normal->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
|
|
normal->driver_state = drv;
|
|
tty_set_operations(normal, &uart_ops);
|
|
|
|
/*
|
|
* Initialise the UART state(s).
|
|
*/
|
|
for (i = 0; i < drv->nr; i++) {
|
|
struct uart_state *state = drv->state + i;
|
|
struct tty_port *port = &state->port;
|
|
|
|
tty_port_init(port);
|
|
port->ops = &uart_port_ops;
|
|
}
|
|
|
|
retval = tty_register_driver(normal);
|
|
if (retval >= 0)
|
|
return retval;
|
|
|
|
for (i = 0; i < drv->nr; i++)
|
|
tty_port_destroy(&drv->state[i].port);
|
|
put_tty_driver(normal);
|
|
out_kfree:
|
|
kfree(drv->state);
|
|
out:
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/**
|
|
* uart_unregister_driver - remove a driver from the uart core layer
|
|
* @drv: low level driver structure
|
|
*
|
|
* Remove all references to a driver from the core driver. The low
|
|
* level driver must have removed all its ports via the
|
|
* uart_remove_one_port() if it registered them with uart_add_one_port().
|
|
* (ie, drv->port == NULL)
|
|
*/
|
|
void uart_unregister_driver(struct uart_driver *drv)
|
|
{
|
|
struct tty_driver *p = drv->tty_driver;
|
|
unsigned int i;
|
|
|
|
tty_unregister_driver(p);
|
|
put_tty_driver(p);
|
|
for (i = 0; i < drv->nr; i++)
|
|
tty_port_destroy(&drv->state[i].port);
|
|
kfree(drv->state);
|
|
drv->state = NULL;
|
|
drv->tty_driver = NULL;
|
|
}
|
|
|
|
struct tty_driver *uart_console_device(struct console *co, int *index)
|
|
{
|
|
struct uart_driver *p = co->data;
|
|
*index = co->index;
|
|
return p->tty_driver;
|
|
}
|
|
|
|
static ssize_t uart_get_attr_uartclk(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct serial_struct tmp;
|
|
struct tty_port *port = dev_get_drvdata(dev);
|
|
|
|
uart_get_info(port, &tmp);
|
|
return snprintf(buf, PAGE_SIZE, "%d\n", tmp.baud_base * 16);
|
|
}
|
|
|
|
static ssize_t uart_get_attr_type(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct serial_struct tmp;
|
|
struct tty_port *port = dev_get_drvdata(dev);
|
|
|
|
uart_get_info(port, &tmp);
|
|
return snprintf(buf, PAGE_SIZE, "%d\n", tmp.type);
|
|
}
|
|
static ssize_t uart_get_attr_line(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct serial_struct tmp;
|
|
struct tty_port *port = dev_get_drvdata(dev);
|
|
|
|
uart_get_info(port, &tmp);
|
|
return snprintf(buf, PAGE_SIZE, "%d\n", tmp.line);
|
|
}
|
|
|
|
static ssize_t uart_get_attr_port(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct serial_struct tmp;
|
|
struct tty_port *port = dev_get_drvdata(dev);
|
|
unsigned long ioaddr;
|
|
|
|
uart_get_info(port, &tmp);
|
|
ioaddr = tmp.port;
|
|
if (HIGH_BITS_OFFSET)
|
|
ioaddr |= (unsigned long)tmp.port_high << HIGH_BITS_OFFSET;
|
|
return snprintf(buf, PAGE_SIZE, "0x%lX\n", ioaddr);
|
|
}
|
|
|
|
static ssize_t uart_get_attr_irq(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct serial_struct tmp;
|
|
struct tty_port *port = dev_get_drvdata(dev);
|
|
|
|
uart_get_info(port, &tmp);
|
|
return snprintf(buf, PAGE_SIZE, "%d\n", tmp.irq);
|
|
}
|
|
|
|
static ssize_t uart_get_attr_flags(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct serial_struct tmp;
|
|
struct tty_port *port = dev_get_drvdata(dev);
|
|
|
|
uart_get_info(port, &tmp);
|
|
return snprintf(buf, PAGE_SIZE, "0x%X\n", tmp.flags);
|
|
}
|
|
|
|
static ssize_t uart_get_attr_xmit_fifo_size(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct serial_struct tmp;
|
|
struct tty_port *port = dev_get_drvdata(dev);
|
|
|
|
uart_get_info(port, &tmp);
|
|
return snprintf(buf, PAGE_SIZE, "%d\n", tmp.xmit_fifo_size);
|
|
}
|
|
|
|
|
|
static ssize_t uart_get_attr_close_delay(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct serial_struct tmp;
|
|
struct tty_port *port = dev_get_drvdata(dev);
|
|
|
|
uart_get_info(port, &tmp);
|
|
return snprintf(buf, PAGE_SIZE, "%d\n", tmp.close_delay);
|
|
}
|
|
|
|
|
|
static ssize_t uart_get_attr_closing_wait(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct serial_struct tmp;
|
|
struct tty_port *port = dev_get_drvdata(dev);
|
|
|
|
uart_get_info(port, &tmp);
|
|
return snprintf(buf, PAGE_SIZE, "%d\n", tmp.closing_wait);
|
|
}
|
|
|
|
static ssize_t uart_get_attr_custom_divisor(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct serial_struct tmp;
|
|
struct tty_port *port = dev_get_drvdata(dev);
|
|
|
|
uart_get_info(port, &tmp);
|
|
return snprintf(buf, PAGE_SIZE, "%d\n", tmp.custom_divisor);
|
|
}
|
|
|
|
static ssize_t uart_get_attr_io_type(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct serial_struct tmp;
|
|
struct tty_port *port = dev_get_drvdata(dev);
|
|
|
|
uart_get_info(port, &tmp);
|
|
return snprintf(buf, PAGE_SIZE, "%d\n", tmp.io_type);
|
|
}
|
|
|
|
static ssize_t uart_get_attr_iomem_base(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct serial_struct tmp;
|
|
struct tty_port *port = dev_get_drvdata(dev);
|
|
|
|
uart_get_info(port, &tmp);
|
|
return snprintf(buf, PAGE_SIZE, "0x%lX\n", (unsigned long)tmp.iomem_base);
|
|
}
|
|
|
|
static ssize_t uart_get_attr_iomem_reg_shift(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct serial_struct tmp;
|
|
struct tty_port *port = dev_get_drvdata(dev);
|
|
|
|
uart_get_info(port, &tmp);
|
|
return snprintf(buf, PAGE_SIZE, "%d\n", tmp.iomem_reg_shift);
|
|
}
|
|
|
|
static DEVICE_ATTR(type, S_IRUSR | S_IRGRP, uart_get_attr_type, NULL);
|
|
static DEVICE_ATTR(line, S_IRUSR | S_IRGRP, uart_get_attr_line, NULL);
|
|
static DEVICE_ATTR(port, S_IRUSR | S_IRGRP, uart_get_attr_port, NULL);
|
|
static DEVICE_ATTR(irq, S_IRUSR | S_IRGRP, uart_get_attr_irq, NULL);
|
|
static DEVICE_ATTR(flags, S_IRUSR | S_IRGRP, uart_get_attr_flags, NULL);
|
|
static DEVICE_ATTR(xmit_fifo_size, S_IRUSR | S_IRGRP, uart_get_attr_xmit_fifo_size, NULL);
|
|
static DEVICE_ATTR(uartclk, S_IRUSR | S_IRGRP, uart_get_attr_uartclk, NULL);
|
|
static DEVICE_ATTR(close_delay, S_IRUSR | S_IRGRP, uart_get_attr_close_delay, NULL);
|
|
static DEVICE_ATTR(closing_wait, S_IRUSR | S_IRGRP, uart_get_attr_closing_wait, NULL);
|
|
static DEVICE_ATTR(custom_divisor, S_IRUSR | S_IRGRP, uart_get_attr_custom_divisor, NULL);
|
|
static DEVICE_ATTR(io_type, S_IRUSR | S_IRGRP, uart_get_attr_io_type, NULL);
|
|
static DEVICE_ATTR(iomem_base, S_IRUSR | S_IRGRP, uart_get_attr_iomem_base, NULL);
|
|
static DEVICE_ATTR(iomem_reg_shift, S_IRUSR | S_IRGRP, uart_get_attr_iomem_reg_shift, NULL);
|
|
|
|
static struct attribute *tty_dev_attrs[] = {
|
|
&dev_attr_type.attr,
|
|
&dev_attr_line.attr,
|
|
&dev_attr_port.attr,
|
|
&dev_attr_irq.attr,
|
|
&dev_attr_flags.attr,
|
|
&dev_attr_xmit_fifo_size.attr,
|
|
&dev_attr_uartclk.attr,
|
|
&dev_attr_close_delay.attr,
|
|
&dev_attr_closing_wait.attr,
|
|
&dev_attr_custom_divisor.attr,
|
|
&dev_attr_io_type.attr,
|
|
&dev_attr_iomem_base.attr,
|
|
&dev_attr_iomem_reg_shift.attr,
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group tty_dev_attr_group = {
|
|
.attrs = tty_dev_attrs,
|
|
};
|
|
|
|
/**
|
|
* uart_add_one_port - attach a driver-defined port structure
|
|
* @drv: pointer to the uart low level driver structure for this port
|
|
* @uport: uart port structure to use for this port.
|
|
*
|
|
* This allows the driver to register its own uart_port structure
|
|
* with the core driver. The main purpose is to allow the low
|
|
* level uart drivers to expand uart_port, rather than having yet
|
|
* more levels of structures.
|
|
*/
|
|
int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport)
|
|
{
|
|
struct uart_state *state;
|
|
struct tty_port *port;
|
|
int ret = 0;
|
|
struct device *tty_dev;
|
|
int num_groups;
|
|
|
|
BUG_ON(in_interrupt());
|
|
|
|
if (uport->line >= drv->nr)
|
|
return -EINVAL;
|
|
|
|
state = drv->state + uport->line;
|
|
port = &state->port;
|
|
|
|
mutex_lock(&port_mutex);
|
|
mutex_lock(&port->mutex);
|
|
if (state->uart_port) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
/* Link the port to the driver state table and vice versa */
|
|
state->uart_port = uport;
|
|
uport->state = state;
|
|
|
|
state->pm_state = UART_PM_STATE_UNDEFINED;
|
|
uport->cons = drv->cons;
|
|
uport->minor = drv->tty_driver->minor_start + uport->line;
|
|
|
|
/*
|
|
* If this port is a console, then the spinlock is already
|
|
* initialised.
|
|
*/
|
|
if (!(uart_console(uport) && (uport->cons->flags & CON_ENABLED))) {
|
|
spin_lock_init(&uport->lock);
|
|
lockdep_set_class(&uport->lock, &port_lock_key);
|
|
}
|
|
if (uport->cons && uport->dev)
|
|
of_console_check(uport->dev->of_node, uport->cons->name, uport->line);
|
|
|
|
uart_configure_port(drv, state, uport);
|
|
|
|
num_groups = 2;
|
|
if (uport->attr_group)
|
|
num_groups++;
|
|
|
|
uport->tty_groups = kcalloc(num_groups, sizeof(*uport->tty_groups),
|
|
GFP_KERNEL);
|
|
if (!uport->tty_groups) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
uport->tty_groups[0] = &tty_dev_attr_group;
|
|
if (uport->attr_group)
|
|
uport->tty_groups[1] = uport->attr_group;
|
|
|
|
/*
|
|
* Register the port whether it's detected or not. This allows
|
|
* setserial to be used to alter this port's parameters.
|
|
*/
|
|
tty_dev = tty_port_register_device_attr(port, drv->tty_driver,
|
|
uport->line, uport->dev, port, uport->tty_groups);
|
|
if (likely(!IS_ERR(tty_dev))) {
|
|
device_set_wakeup_capable(tty_dev, 1);
|
|
} else {
|
|
dev_err(uport->dev, "Cannot register tty device on line %d\n",
|
|
uport->line);
|
|
}
|
|
|
|
/*
|
|
* Ensure UPF_DEAD is not set.
|
|
*/
|
|
uport->flags &= ~UPF_DEAD;
|
|
|
|
out:
|
|
mutex_unlock(&port->mutex);
|
|
mutex_unlock(&port_mutex);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* uart_remove_one_port - detach a driver defined port structure
|
|
* @drv: pointer to the uart low level driver structure for this port
|
|
* @uport: uart port structure for this port
|
|
*
|
|
* This unhooks (and hangs up) the specified port structure from the
|
|
* core driver. No further calls will be made to the low-level code
|
|
* for this port.
|
|
*/
|
|
int uart_remove_one_port(struct uart_driver *drv, struct uart_port *uport)
|
|
{
|
|
struct uart_state *state = drv->state + uport->line;
|
|
struct tty_port *port = &state->port;
|
|
struct tty_struct *tty;
|
|
int ret = 0;
|
|
|
|
BUG_ON(in_interrupt());
|
|
|
|
if (state->uart_port != uport)
|
|
dev_alert(uport->dev, "Removing wrong port: %p != %p\n",
|
|
state->uart_port, uport);
|
|
|
|
mutex_lock(&port_mutex);
|
|
|
|
/*
|
|
* Mark the port "dead" - this prevents any opens from
|
|
* succeeding while we shut down the port.
|
|
*/
|
|
mutex_lock(&port->mutex);
|
|
if (!state->uart_port) {
|
|
mutex_unlock(&port->mutex);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
uport->flags |= UPF_DEAD;
|
|
mutex_unlock(&port->mutex);
|
|
|
|
/*
|
|
* Remove the devices from the tty layer
|
|
*/
|
|
tty_unregister_device(drv->tty_driver, uport->line);
|
|
|
|
tty = tty_port_tty_get(port);
|
|
if (tty) {
|
|
tty_vhangup(port->tty);
|
|
tty_kref_put(tty);
|
|
}
|
|
|
|
/*
|
|
* If the port is used as a console, unregister it
|
|
*/
|
|
if (uart_console(uport))
|
|
unregister_console(uport->cons);
|
|
|
|
/*
|
|
* Free the port IO and memory resources, if any.
|
|
*/
|
|
if (uport->type != PORT_UNKNOWN)
|
|
uport->ops->release_port(uport);
|
|
kfree(uport->tty_groups);
|
|
|
|
/*
|
|
* Indicate that there isn't a port here anymore.
|
|
*/
|
|
uport->type = PORT_UNKNOWN;
|
|
|
|
state->uart_port = NULL;
|
|
out:
|
|
mutex_unlock(&port_mutex);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Are the two ports equivalent?
|
|
*/
|
|
int uart_match_port(struct uart_port *port1, struct uart_port *port2)
|
|
{
|
|
if (port1->iotype != port2->iotype)
|
|
return 0;
|
|
|
|
switch (port1->iotype) {
|
|
case UPIO_PORT:
|
|
return (port1->iobase == port2->iobase);
|
|
case UPIO_HUB6:
|
|
return (port1->iobase == port2->iobase) &&
|
|
(port1->hub6 == port2->hub6);
|
|
case UPIO_MEM:
|
|
case UPIO_MEM32:
|
|
case UPIO_MEM32BE:
|
|
case UPIO_AU:
|
|
case UPIO_TSI:
|
|
return (port1->mapbase == port2->mapbase);
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(uart_match_port);
|
|
|
|
/**
|
|
* uart_handle_dcd_change - handle a change of carrier detect state
|
|
* @uport: uart_port structure for the open port
|
|
* @status: new carrier detect status, nonzero if active
|
|
*
|
|
* Caller must hold uport->lock
|
|
*/
|
|
void uart_handle_dcd_change(struct uart_port *uport, unsigned int status)
|
|
{
|
|
struct tty_port *port = &uport->state->port;
|
|
struct tty_struct *tty = port->tty;
|
|
struct tty_ldisc *ld;
|
|
|
|
lockdep_assert_held_once(&uport->lock);
|
|
|
|
if (tty) {
|
|
ld = tty_ldisc_ref(tty);
|
|
if (ld) {
|
|
if (ld->ops->dcd_change)
|
|
ld->ops->dcd_change(tty, status);
|
|
tty_ldisc_deref(ld);
|
|
}
|
|
}
|
|
|
|
uport->icount.dcd++;
|
|
|
|
if (uart_dcd_enabled(uport)) {
|
|
if (status)
|
|
wake_up_interruptible(&port->open_wait);
|
|
else if (tty)
|
|
tty_hangup(tty);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(uart_handle_dcd_change);
|
|
|
|
/**
|
|
* uart_handle_cts_change - handle a change of clear-to-send state
|
|
* @uport: uart_port structure for the open port
|
|
* @status: new clear to send status, nonzero if active
|
|
*
|
|
* Caller must hold uport->lock
|
|
*/
|
|
void uart_handle_cts_change(struct uart_port *uport, unsigned int status)
|
|
{
|
|
lockdep_assert_held_once(&uport->lock);
|
|
|
|
uport->icount.cts++;
|
|
|
|
if (uart_softcts_mode(uport)) {
|
|
if (uport->hw_stopped) {
|
|
if (status) {
|
|
uport->hw_stopped = 0;
|
|
uport->ops->start_tx(uport);
|
|
uart_write_wakeup(uport);
|
|
}
|
|
} else {
|
|
if (!status) {
|
|
uport->hw_stopped = 1;
|
|
uport->ops->stop_tx(uport);
|
|
}
|
|
}
|
|
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(uart_handle_cts_change);
|
|
|
|
/**
|
|
* uart_insert_char - push a char to the uart layer
|
|
*
|
|
* User is responsible to call tty_flip_buffer_push when they are done with
|
|
* insertion.
|
|
*
|
|
* @port: corresponding port
|
|
* @status: state of the serial port RX buffer (LSR for 8250)
|
|
* @overrun: mask of overrun bits in @status
|
|
* @ch: character to push
|
|
* @flag: flag for the character (see TTY_NORMAL and friends)
|
|
*/
|
|
void uart_insert_char(struct uart_port *port, unsigned int status,
|
|
unsigned int overrun, unsigned int ch, unsigned int flag)
|
|
{
|
|
struct tty_port *tport = &port->state->port;
|
|
|
|
if ((status & port->ignore_status_mask & ~overrun) == 0)
|
|
if (tty_insert_flip_char(tport, ch, flag) == 0)
|
|
++port->icount.buf_overrun;
|
|
|
|
/*
|
|
* Overrun is special. Since it's reported immediately,
|
|
* it doesn't affect the current character.
|
|
*/
|
|
if (status & ~port->ignore_status_mask & overrun)
|
|
if (tty_insert_flip_char(tport, 0, TTY_OVERRUN) == 0)
|
|
++port->icount.buf_overrun;
|
|
}
|
|
EXPORT_SYMBOL_GPL(uart_insert_char);
|
|
|
|
EXPORT_SYMBOL(uart_write_wakeup);
|
|
EXPORT_SYMBOL(uart_register_driver);
|
|
EXPORT_SYMBOL(uart_unregister_driver);
|
|
EXPORT_SYMBOL(uart_suspend_port);
|
|
EXPORT_SYMBOL(uart_resume_port);
|
|
EXPORT_SYMBOL(uart_add_one_port);
|
|
EXPORT_SYMBOL(uart_remove_one_port);
|
|
|
|
MODULE_DESCRIPTION("Serial driver core");
|
|
MODULE_LICENSE("GPL");
|