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1275 |
phoenix |
/*
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* drivers/char/serial_txx927.c
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* driver for TX[34]927 SIO
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*
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* Copyright 2001 MontaVista Software Inc.
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* Author: MontaVista Software, Inc.
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* ahennessy@mvista.com
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*
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* Based on drivers/char/serial.c
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*
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* Copyright (C) 2000-2001 Toshiba Corporation
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
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* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#define SERIAL_DO_RESTART
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/* Set of debugging defines */
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#undef SERIAL_DEBUG_INTR
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#undef SERIAL_DEBUG_OPEN
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#undef SERIAL_DEBUG_FLOW
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#undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
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#undef SERIAL_DEBUG_PCI
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#undef SERIAL_DEBUG_AUTOCONF
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#ifdef MODULE
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#undef CONFIG_TXX927_SERIAL_CONSOLE
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#endif
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#define CONFIG_SERIAL_RSA
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#define RS_STROBE_TIME (10*HZ)
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#define RS_ISR_PASS_LIMIT 256
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/*
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* End of serial driver configuration section.
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*/
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#include <linux/module.h>
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/timer.h>
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#include <linux/interrupt.h>
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#include <linux/tty.h>
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#include <linux/tty_flip.h>
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#include <linux/serial.h>
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#include <linux/circ_buf.h>
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#include <linux/serial_reg.h>
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#include <linux/major.h>
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#include <linux/string.h>
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#include <linux/fcntl.h>
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#include <linux/ptrace.h>
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#include <linux/ioport.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/serialP.h>
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#include <linux/delay.h>
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#ifdef CONFIG_TXX927_SERIAL_CONSOLE
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#include <linux/console.h>
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#endif
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#ifdef CONFIG_MAGIC_SYSRQ
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#include <linux/sysrq.h>
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#endif
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#include <asm/system.h>
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#include <asm/serial.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#include <asm/uaccess.h>
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#include <asm/bitops.h>
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#include <asm/jmr3927/txx927.h>
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#include <asm/bootinfo.h>
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#ifdef CONFIG_TOSHIBA_JMR3927
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#include <asm/jmr3927/jmr3927.h>
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#endif
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#define _INLINE_ inline
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#ifdef CONFIG_MAC_SERIAL
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#define SERIAL_DEV_OFFSET 2
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#else
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#define SERIAL_DEV_OFFSET 0
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#endif
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static char *serial_name = "TXx927 Serial driver";
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static char *serial_version = "0.02";
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static DECLARE_TASK_QUEUE(tq_serial);
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static struct tty_driver serial_driver, callout_driver;
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static int serial_refcount;
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static struct timer_list serial_timer;
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extern unsigned long get_txx927_uart_baud(void);
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/* serial subtype definitions */
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#ifndef SERIAL_TYPE_NORMAL
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#define SERIAL_TYPE_NORMAL 1
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#define SERIAL_TYPE_CALLOUT 2
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#endif
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/* number of characters left in xmit buffer before we ask for more */
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#define WAKEUP_CHARS 256
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/*
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* IRQ_timeout - How long the timeout should be for each IRQ
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* should be after the IRQ has been active.
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*/
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static struct async_struct *IRQ_ports[NR_IRQS];
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static int IRQ_timeout[NR_IRQS];
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#ifdef CONFIG_TXX927_SERIAL_CONSOLE
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static struct console sercons;
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#endif
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#if defined(CONFIG_TXX927_SERIAL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
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static unsigned long break_pressed; /* break, really ... */
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#endif
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static void change_speed(struct async_struct *info, struct termios *old);
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static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
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#ifndef PREPARE_FUNC
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#define PREPARE_FUNC(dev) (dev->prepare)
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#define ACTIVATE_FUNC(dev) (dev->activate)
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#define DEACTIVATE_FUNC(dev) (dev->deactivate)
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#endif
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#define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8)
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#if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
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#define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
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kdevname(tty->device), (info->flags), serial_refcount,info->count,tty->count,s)
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#else
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#define DBG_CNT(s)
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#endif
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#define SERIAL_DRIVER_NAME "TXx927SIO"
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#ifdef CONFIG_SERIAL
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/* "ttyS","cua" is used for standard serial driver */
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#define TXX927_TTY_NAME "ttySC"
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#define TXX927_TTY_MINOR_START (64 + 16) /* ttySC0(80), ttySC1(81) */
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#define TXX927_CU_NAME "cuac"
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#define TXX927_SERIAL_BH TXX927SERIAL_BH
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#else
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/* acts like standard serial driver */
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#define TXX927_TTY_NAME "ttyS"
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#define TXX927_TTY_MINOR_START 64
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#define TXX927_CU_NAME "cua"
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#define TXX927_SERIAL_BH SERIAL_BH
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#endif
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#define TXX927_TTY_MAJOR TTY_MAJOR
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#define TXX927_TTYAUX_MAJOR TTYAUX_MAJOR
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#define ASYNC_HAVE_CTS_LINE ASYNC_BOOT_AUTOCONF /* reuse */
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static struct serial_state rs_table[RS_TABLE_SIZE] = {
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SERIAL_PORT_DFNS /* Defined in serial.h */
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};
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#define NR_PORTS (sizeof(rs_table)/sizeof(struct serial_state))
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static struct tty_struct *serial_table[NR_PORTS];
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static struct termios *serial_termios[NR_PORTS];
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static struct termios *serial_termios_locked[NR_PORTS];
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#ifndef MIN
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#define MIN(a,b) ((a) < (b) ? (a) : (b))
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#endif
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/*
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* tmp_buf is used as a temporary buffer by serial_write. We need to
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* lock it in case the copy_from_user blocks while swapping in a page,
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* and some other program tries to do a serial write at the same time.
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* Since the lock will only come under contention when the system is
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* swapping and available memory is low, it makes sense to share one
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* buffer across all the serial ports, since it significantly saves
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* memory if large numbers of serial ports are open.
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*/
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static unsigned char *tmp_buf;
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#ifdef DECLARE_MUTEX
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static DECLARE_MUTEX(tmp_buf_sem);
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#else
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static struct semaphore tmp_buf_sem = MUTEX;
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#endif
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static inline int serial_paranoia_check(struct async_struct *info,
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kdev_t device, const char *routine)
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{
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#ifdef SERIAL_PARANOIA_CHECK
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static const char *badmagic =
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"Warning: bad magic number for serial struct (%s) in %s\n";
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static const char *badinfo =
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"Warning: null async_struct for (%s) in %s\n";
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if (!info) {
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printk(badinfo, kdevname(device), routine);
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return 1;
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}
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if (info->magic != SERIAL_MAGIC) {
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printk(badmagic, kdevname(device), routine);
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return 1;
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}
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#endif
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return 0;
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}
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static inline struct txx927_sio_reg *sio_reg(struct async_struct *info)
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{
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return (struct txx927_sio_reg *)info->port;
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}
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| 239 |
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/*
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* Wait for transmitter & holding register to empty
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*/
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static inline void wait_for_xmitr(struct async_struct *info)
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{
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unsigned int tmout = 1000000;
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do {
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if (--tmout == 0) break;
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} while (!(sio_reg(info)->cisr & TXx927_SICISR_TXALS));
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}
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| 250 |
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| 251 |
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/*
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* ------------------------------------------------------------
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* rs_stop() and rs_start()
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*
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* This routines are called before setting or resetting tty->stopped.
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* They enable or disable transmitter interrupts, as necessary.
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* ------------------------------------------------------------
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*/
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static void rs_stop(struct tty_struct *tty)
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{
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struct async_struct *info = (struct async_struct *)tty->driver_data;
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unsigned long flags;
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if (serial_paranoia_check(info, tty->device, "rs_stop"))
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return;
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save_flags(flags); cli();
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if (info->IER & UART_IER_THRI) {
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info->IER &= ~UART_IER_THRI;
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sio_reg(info)->dicr &= ~TXx927_SIDICR_TIE;
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}
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restore_flags(flags);
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}
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| 275 |
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static void rs_start(struct tty_struct *tty)
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{
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struct async_struct *info = (struct async_struct *)tty->driver_data;
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unsigned long flags;
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| 280 |
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if (serial_paranoia_check(info, tty->device, "rs_start"))
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return;
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| 282 |
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| 283 |
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save_flags(flags); cli();
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if (info->xmit.head != info->xmit.tail
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&& info->xmit.buf
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&& !(info->IER & UART_IER_THRI)) {
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info->IER |= UART_IER_THRI;
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| 288 |
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sio_reg(info)->dicr |= TXx927_SIDICR_TIE;
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| 289 |
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}
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| 290 |
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restore_flags(flags);
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| 291 |
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}
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| 292 |
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| 293 |
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/*
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| 294 |
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* ----------------------------------------------------------------------
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| 295 |
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*
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| 296 |
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* Here starts the interrupt handling routines. All of the following
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| 297 |
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* subroutines are declared as inline and are folded into
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| 298 |
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* rs_interrupt(). They were separated out for readability's sake.
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| 299 |
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*
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| 300 |
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* Note: rs_interrupt() is a "fast" interrupt, which means that it
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| 301 |
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* runs with interrupts turned off. People who may want to modify
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| 302 |
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* rs_interrupt() should try to keep the interrupt handler as fast as
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* possible. After you are done making modifications, it is not a bad
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| 304 |
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* idea to do:
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*
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* gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
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*
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| 308 |
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* and look at the resulting assemble code in serial.s.
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| 309 |
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*
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| 310 |
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* - Ted Ts'o (tytso@mit.edu), 7-Mar-93
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* -----------------------------------------------------------------------
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| 312 |
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*/
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| 313 |
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| 314 |
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/*
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| 315 |
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* This routine is used by the interrupt handler to schedule
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| 316 |
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* processing in the software interrupt portion of the driver.
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| 317 |
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*/
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| 318 |
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static _INLINE_ void rs_sched_event(struct async_struct *info,
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| 319 |
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int event)
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| 320 |
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{
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| 321 |
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info->event |= 1 << event;
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| 322 |
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queue_task(&info->tqueue, &tq_serial);
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| 323 |
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mark_bh(TXX927_SERIAL_BH);
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| 324 |
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}
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| 325 |
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| 326 |
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static _INLINE_ void receive_chars(struct async_struct *info,
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| 327 |
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int *status)
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| 328 |
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{
|
| 329 |
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struct tty_struct *tty = info->tty;
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| 330 |
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unsigned char ch;
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| 331 |
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int ignored = 0;
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| 332 |
|
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struct async_icount *icount;
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| 333 |
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| 334 |
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icount = &info->state->icount;
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| 335 |
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do {
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| 336 |
|
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ch = sio_reg(info)->rfifo;
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| 337 |
|
|
if (tty->flip.count >= TTY_FLIPBUF_SIZE)
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| 338 |
|
|
break;
|
| 339 |
|
|
*tty->flip.char_buf_ptr = ch;
|
| 340 |
|
|
icount->rx++;
|
| 341 |
|
|
|
| 342 |
|
|
#ifdef SERIAL_DEBUG_INTR
|
| 343 |
|
|
printk("DR%02x:%02x...", ch, *status);
|
| 344 |
|
|
#endif
|
| 345 |
|
|
*tty->flip.flag_buf_ptr = 0;
|
| 346 |
|
|
if (*status & (TXx927_SIDISR_UBRK | TXx927_SIDISR_UPER |
|
| 347 |
|
|
TXx927_SIDISR_UFER | TXx927_SIDISR_UOER)) {
|
| 348 |
|
|
/*
|
| 349 |
|
|
* For statistics only
|
| 350 |
|
|
*/
|
| 351 |
|
|
if (*status & TXx927_SIDISR_UBRK) {
|
| 352 |
|
|
*status &= ~(TXx927_SIDISR_UFER | TXx927_SIDISR_UPER);
|
| 353 |
|
|
icount->brk++;
|
| 354 |
|
|
} else if (*status & TXx927_SIDISR_UPER)
|
| 355 |
|
|
icount->parity++;
|
| 356 |
|
|
else if (*status & TXx927_SIDISR_UFER)
|
| 357 |
|
|
icount->frame++;
|
| 358 |
|
|
if (*status & TXx927_SIDISR_UOER)
|
| 359 |
|
|
icount->overrun++;
|
| 360 |
|
|
|
| 361 |
|
|
/*
|
| 362 |
|
|
* Now check to see if character should be
|
| 363 |
|
|
* ignored, and mask off conditions which
|
| 364 |
|
|
* should be ignored.
|
| 365 |
|
|
*/
|
| 366 |
|
|
if (*status & info->ignore_status_mask) {
|
| 367 |
|
|
if (++ignored > 100)
|
| 368 |
|
|
break;
|
| 369 |
|
|
goto ignore_char;
|
| 370 |
|
|
}
|
| 371 |
|
|
*status &= info->read_status_mask;
|
| 372 |
|
|
|
| 373 |
|
|
if (*status & (TXx927_SIDISR_UBRK)) {
|
| 374 |
|
|
#ifdef SERIAL_DEBUG_INTR
|
| 375 |
|
|
printk("handling break....");
|
| 376 |
|
|
#endif
|
| 377 |
|
|
*tty->flip.flag_buf_ptr = TTY_BREAK;
|
| 378 |
|
|
if (info->flags & ASYNC_SAK)
|
| 379 |
|
|
do_SAK(tty);
|
| 380 |
|
|
} else if (*status & TXx927_SIDISR_UPER)
|
| 381 |
|
|
*tty->flip.flag_buf_ptr = TTY_PARITY;
|
| 382 |
|
|
else if (*status & TXx927_SIDISR_UFER)
|
| 383 |
|
|
*tty->flip.flag_buf_ptr = TTY_FRAME;
|
| 384 |
|
|
if (*status & TXx927_SIDISR_UOER) {
|
| 385 |
|
|
/*
|
| 386 |
|
|
* Overrun is special, since it's
|
| 387 |
|
|
* reported immediately, and doesn't
|
| 388 |
|
|
* affect the current character
|
| 389 |
|
|
*/
|
| 390 |
|
|
if (tty->flip.count < TTY_FLIPBUF_SIZE) {
|
| 391 |
|
|
tty->flip.count++;
|
| 392 |
|
|
tty->flip.flag_buf_ptr++;
|
| 393 |
|
|
tty->flip.char_buf_ptr++;
|
| 394 |
|
|
*tty->flip.flag_buf_ptr = TTY_OVERRUN;
|
| 395 |
|
|
}
|
| 396 |
|
|
}
|
| 397 |
|
|
}
|
| 398 |
|
|
tty->flip.flag_buf_ptr++;
|
| 399 |
|
|
tty->flip.char_buf_ptr++;
|
| 400 |
|
|
tty->flip.count++;
|
| 401 |
|
|
ignore_char:
|
| 402 |
|
|
*status = sio_reg(info)->disr;
|
| 403 |
|
|
} while (!(*status & TXx927_SIDISR_UVALID));
|
| 404 |
|
|
|
| 405 |
|
|
tty_flip_buffer_push(tty);
|
| 406 |
|
|
}
|
| 407 |
|
|
|
| 408 |
|
|
static _INLINE_ void transmit_chars(struct async_struct *info, int *intr_done)
|
| 409 |
|
|
{
|
| 410 |
|
|
int count;
|
| 411 |
|
|
|
| 412 |
|
|
wait_for_xmitr(info);
|
| 413 |
|
|
|
| 414 |
|
|
if (info->x_char) {
|
| 415 |
|
|
sio_reg(info)->tfifo = info->x_char;
|
| 416 |
|
|
info->state->icount.tx++;
|
| 417 |
|
|
info->x_char = 0;
|
| 418 |
|
|
if (intr_done)
|
| 419 |
|
|
*intr_done = 0;
|
| 420 |
|
|
return;
|
| 421 |
|
|
}
|
| 422 |
|
|
|
| 423 |
|
|
if (info->xmit.head == info->xmit.tail
|
| 424 |
|
|
|| info->tty->stopped
|
| 425 |
|
|
|| info->tty->hw_stopped) {
|
| 426 |
|
|
sio_reg(info)->dicr &= ~TXx927_SIDICR_TIE;
|
| 427 |
|
|
return;
|
| 428 |
|
|
}
|
| 429 |
|
|
|
| 430 |
|
|
count = info->xmit_fifo_size;
|
| 431 |
|
|
do {
|
| 432 |
|
|
sio_reg(info)->tfifo = info->xmit.buf[info->xmit.tail++];
|
| 433 |
|
|
info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1);
|
| 434 |
|
|
info->state->icount.tx++;
|
| 435 |
|
|
if (info->xmit.head == info->xmit.tail)
|
| 436 |
|
|
break;
|
| 437 |
|
|
} while (--count > 0);
|
| 438 |
|
|
|
| 439 |
|
|
if (CIRC_CNT(info->xmit.head,
|
| 440 |
|
|
info->xmit.tail,
|
| 441 |
|
|
SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
|
| 442 |
|
|
rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
|
| 443 |
|
|
|
| 444 |
|
|
#ifdef SERIAL_DEBUG_INTR
|
| 445 |
|
|
printk("THRE...");
|
| 446 |
|
|
#endif
|
| 447 |
|
|
if (intr_done)
|
| 448 |
|
|
*intr_done = 0;
|
| 449 |
|
|
|
| 450 |
|
|
if (info->xmit.head == info->xmit.tail) {
|
| 451 |
|
|
sio_reg(info)->dicr &= ~TXx927_SIDICR_TIE;
|
| 452 |
|
|
}
|
| 453 |
|
|
}
|
| 454 |
|
|
|
| 455 |
|
|
static _INLINE_ void check_modem_status(struct async_struct *info)
|
| 456 |
|
|
{
|
| 457 |
|
|
/* RTS/CTS are controled by HW. (if possible) */
|
| 458 |
|
|
}
|
| 459 |
|
|
|
| 460 |
|
|
/*
|
| 461 |
|
|
* This is the serial driver's interrupt routine for a single port
|
| 462 |
|
|
*/
|
| 463 |
|
|
static void rs_interrupt_single(int irq, void *dev_id, struct pt_regs * regs)
|
| 464 |
|
|
{
|
| 465 |
|
|
int status;
|
| 466 |
|
|
int pass_counter = 0;
|
| 467 |
|
|
struct async_struct * info;
|
| 468 |
|
|
|
| 469 |
|
|
#ifdef SERIAL_DEBUG_INTR
|
| 470 |
|
|
printk("rs_interrupt_single(%d)...", irq);
|
| 471 |
|
|
#endif
|
| 472 |
|
|
|
| 473 |
|
|
info = IRQ_ports[irq];
|
| 474 |
|
|
if (!info || !info->tty)
|
| 475 |
|
|
return;
|
| 476 |
|
|
|
| 477 |
|
|
do {
|
| 478 |
|
|
status = sio_reg(info)->disr;
|
| 479 |
|
|
#ifdef SERIAL_DEBUG_INTR
|
| 480 |
|
|
printk("status = %x...", status);
|
| 481 |
|
|
#endif
|
| 482 |
|
|
if (!(sio_reg(info)->dicr & TXx927_SIDICR_TIE))
|
| 483 |
|
|
status &= ~TXx927_SIDISR_TDIS;
|
| 484 |
|
|
if (!(status & (TXx927_SIDISR_TDIS | TXx927_SIDISR_RDIS | TXx927_SIDISR_TOUT)))
|
| 485 |
|
|
break;
|
| 486 |
|
|
|
| 487 |
|
|
if (status & TXx927_SIDISR_RDIS)
|
| 488 |
|
|
receive_chars(info, &status);
|
| 489 |
|
|
check_modem_status(info);
|
| 490 |
|
|
if (status & TXx927_SIDISR_TDIS)
|
| 491 |
|
|
transmit_chars(info, 0);
|
| 492 |
|
|
/* Clear TX/RX Int. Status */
|
| 493 |
|
|
sio_reg(info)->disr &= ~(TXx927_SIDISR_TDIS | TXx927_SIDISR_RDIS | TXx927_SIDISR_TOUT);
|
| 494 |
|
|
|
| 495 |
|
|
if (pass_counter++ > RS_ISR_PASS_LIMIT) {
|
| 496 |
|
|
#ifdef SERIAL_DEBUG_INTR
|
| 497 |
|
|
printk("rs_single loop break.\n");
|
| 498 |
|
|
#endif
|
| 499 |
|
|
break;
|
| 500 |
|
|
}
|
| 501 |
|
|
} while (1);
|
| 502 |
|
|
info->last_active = jiffies;
|
| 503 |
|
|
#ifdef SERIAL_DEBUG_INTR
|
| 504 |
|
|
printk("end.\n");
|
| 505 |
|
|
#endif
|
| 506 |
|
|
}
|
| 507 |
|
|
|
| 508 |
|
|
/*
|
| 509 |
|
|
* -------------------------------------------------------------------
|
| 510 |
|
|
* Here ends the serial interrupt routines.
|
| 511 |
|
|
* -------------------------------------------------------------------
|
| 512 |
|
|
*/
|
| 513 |
|
|
|
| 514 |
|
|
/*
|
| 515 |
|
|
* This routine is used to handle the "bottom half" processing for the
|
| 516 |
|
|
* serial driver, known also the "software interrupt" processing.
|
| 517 |
|
|
* This processing is done at the kernel interrupt level, after the
|
| 518 |
|
|
* rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON. This
|
| 519 |
|
|
* is where time-consuming activities which can not be done in the
|
| 520 |
|
|
* interrupt driver proper are done; the interrupt driver schedules
|
| 521 |
|
|
* them using rs_sched_event(), and they get done here.
|
| 522 |
|
|
*/
|
| 523 |
|
|
static void do_serial_bh(void)
|
| 524 |
|
|
{
|
| 525 |
|
|
run_task_queue(&tq_serial);
|
| 526 |
|
|
}
|
| 527 |
|
|
|
| 528 |
|
|
static void do_softint(void *private_)
|
| 529 |
|
|
{
|
| 530 |
|
|
struct async_struct *info = (struct async_struct *) private_;
|
| 531 |
|
|
struct tty_struct *tty;
|
| 532 |
|
|
|
| 533 |
|
|
tty = info->tty;
|
| 534 |
|
|
if (!tty)
|
| 535 |
|
|
return;
|
| 536 |
|
|
|
| 537 |
|
|
if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) {
|
| 538 |
|
|
if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
|
| 539 |
|
|
tty->ldisc.write_wakeup)
|
| 540 |
|
|
(tty->ldisc.write_wakeup)(tty);
|
| 541 |
|
|
wake_up_interruptible(&tty->write_wait);
|
| 542 |
|
|
#ifdef SERIAL_HAVE_POLL_WAIT
|
| 543 |
|
|
wake_up_interruptible(&tty->poll_wait);
|
| 544 |
|
|
#endif
|
| 545 |
|
|
}
|
| 546 |
|
|
}
|
| 547 |
|
|
|
| 548 |
|
|
/*
|
| 549 |
|
|
* This subroutine is called when the RS_TIMER goes off. It is used
|
| 550 |
|
|
* by the serial driver to handle ports that do not have an interrupt
|
| 551 |
|
|
* (irq=0). This doesn't work very well for 16450's, but gives barely
|
| 552 |
|
|
* passable results for a 16550A. (Although at the expense of much
|
| 553 |
|
|
* CPU overhead).
|
| 554 |
|
|
*/
|
| 555 |
|
|
static void rs_timer(unsigned long dummy)
|
| 556 |
|
|
{
|
| 557 |
|
|
static unsigned long last_strobe;
|
| 558 |
|
|
struct async_struct *info;
|
| 559 |
|
|
unsigned int i;
|
| 560 |
|
|
unsigned long flags;
|
| 561 |
|
|
|
| 562 |
|
|
if ((jiffies - last_strobe) >= RS_STROBE_TIME) {
|
| 563 |
|
|
for (i=0; i < NR_IRQS; i++) {
|
| 564 |
|
|
info = IRQ_ports[i];
|
| 565 |
|
|
if (!info)
|
| 566 |
|
|
continue;
|
| 567 |
|
|
save_flags(flags); cli();
|
| 568 |
|
|
rs_interrupt_single(i, NULL, NULL);
|
| 569 |
|
|
restore_flags(flags);
|
| 570 |
|
|
}
|
| 571 |
|
|
}
|
| 572 |
|
|
last_strobe = jiffies;
|
| 573 |
|
|
mod_timer(&serial_timer, jiffies + RS_STROBE_TIME);
|
| 574 |
|
|
|
| 575 |
|
|
#if 0
|
| 576 |
|
|
if (IRQ_ports[0]) {
|
| 577 |
|
|
save_flags(flags); cli();
|
| 578 |
|
|
rs_interrupt_single(0, NULL, NULL);
|
| 579 |
|
|
restore_flags(flags);
|
| 580 |
|
|
|
| 581 |
|
|
mod_timer(&serial_timer, jiffies + IRQ_timeout[0]);
|
| 582 |
|
|
}
|
| 583 |
|
|
#endif
|
| 584 |
|
|
}
|
| 585 |
|
|
|
| 586 |
|
|
/*
|
| 587 |
|
|
* ---------------------------------------------------------------
|
| 588 |
|
|
* Low level utility subroutines for the serial driver: routines to
|
| 589 |
|
|
* figure out the appropriate timeout for an interrupt chain, routines
|
| 590 |
|
|
* to initialize and startup a serial port, and routines to shutdown a
|
| 591 |
|
|
* serial port. Useful stuff like that.
|
| 592 |
|
|
* ---------------------------------------------------------------
|
| 593 |
|
|
*/
|
| 594 |
|
|
|
| 595 |
|
|
/*
|
| 596 |
|
|
* This routine figures out the correct timeout for a particular IRQ.
|
| 597 |
|
|
* It uses the smallest timeout of all of the serial ports in a
|
| 598 |
|
|
* particular interrupt chain. Now only used for IRQ 0....
|
| 599 |
|
|
*/
|
| 600 |
|
|
static void figure_IRQ_timeout(int irq)
|
| 601 |
|
|
{
|
| 602 |
|
|
struct async_struct *info;
|
| 603 |
|
|
int timeout = 60*HZ; /* 60 seconds === a long time :-) */
|
| 604 |
|
|
|
| 605 |
|
|
info = IRQ_ports[irq];
|
| 606 |
|
|
if (!info) {
|
| 607 |
|
|
IRQ_timeout[irq] = 60*HZ;
|
| 608 |
|
|
return;
|
| 609 |
|
|
}
|
| 610 |
|
|
while (info) {
|
| 611 |
|
|
if (info->timeout < timeout)
|
| 612 |
|
|
timeout = info->timeout;
|
| 613 |
|
|
info = info->next_port;
|
| 614 |
|
|
}
|
| 615 |
|
|
if (!irq)
|
| 616 |
|
|
timeout = timeout / 2;
|
| 617 |
|
|
IRQ_timeout[irq] = timeout ? timeout : 1;
|
| 618 |
|
|
}
|
| 619 |
|
|
|
| 620 |
|
|
static int startup(struct async_struct * info)
|
| 621 |
|
|
{
|
| 622 |
|
|
unsigned long flags;
|
| 623 |
|
|
int retval=0;
|
| 624 |
|
|
struct serial_state *state= info->state;
|
| 625 |
|
|
unsigned long page;
|
| 626 |
|
|
|
| 627 |
|
|
page = get_zeroed_page(GFP_KERNEL);
|
| 628 |
|
|
if (!page)
|
| 629 |
|
|
return -ENOMEM;
|
| 630 |
|
|
|
| 631 |
|
|
save_flags(flags); cli();
|
| 632 |
|
|
|
| 633 |
|
|
if (info->flags & ASYNC_INITIALIZED) {
|
| 634 |
|
|
free_page(page);
|
| 635 |
|
|
goto errout;
|
| 636 |
|
|
}
|
| 637 |
|
|
|
| 638 |
|
|
if (!state->port) {
|
| 639 |
|
|
if (info->tty)
|
| 640 |
|
|
set_bit(TTY_IO_ERROR, &info->tty->flags);
|
| 641 |
|
|
free_page(page);
|
| 642 |
|
|
goto errout;
|
| 643 |
|
|
}
|
| 644 |
|
|
if (info->xmit.buf)
|
| 645 |
|
|
free_page(page);
|
| 646 |
|
|
else
|
| 647 |
|
|
info->xmit.buf = (unsigned char *) page;
|
| 648 |
|
|
|
| 649 |
|
|
#ifdef SERIAL_DEBUG_OPEN
|
| 650 |
|
|
printk("starting up ttys%d (irq %d)...", info->line, state->irq);
|
| 651 |
|
|
#endif
|
| 652 |
|
|
|
| 653 |
|
|
/*
|
| 654 |
|
|
* Clear the FIFO buffers and disable them
|
| 655 |
|
|
* (they will be reenabled in change_speed())
|
| 656 |
|
|
*/
|
| 657 |
|
|
sio_reg(info)->fcr |= TXx927_SIFCR_TFRST | TXx927_SIFCR_RFRST |
|
| 658 |
|
|
TXx927_SIFCR_FRSTE;
|
| 659 |
|
|
/* clear reset */
|
| 660 |
|
|
sio_reg(info)->fcr &= ~(TXx927_SIFCR_TFRST | TXx927_SIFCR_RFRST |
|
| 661 |
|
|
TXx927_SIFCR_FRSTE);
|
| 662 |
|
|
|
| 663 |
|
|
/*
|
| 664 |
|
|
* Allocate the IRQ if necessary
|
| 665 |
|
|
*/
|
| 666 |
|
|
if (state->irq && (!IRQ_ports[state->irq] ||
|
| 667 |
|
|
!IRQ_ports[state->irq]->next_port)) {
|
| 668 |
|
|
if (IRQ_ports[state->irq]) {
|
| 669 |
|
|
retval = -EBUSY;
|
| 670 |
|
|
goto errout;
|
| 671 |
|
|
}
|
| 672 |
|
|
|
| 673 |
|
|
retval = request_irq(state->irq, rs_interrupt_single,
|
| 674 |
|
|
SA_INTERRUPT,
|
| 675 |
|
|
"txx927serial", NULL);
|
| 676 |
|
|
if (retval) {
|
| 677 |
|
|
if (capable(CAP_SYS_ADMIN)) {
|
| 678 |
|
|
if (info->tty)
|
| 679 |
|
|
set_bit(TTY_IO_ERROR,
|
| 680 |
|
|
&info->tty->flags);
|
| 681 |
|
|
retval = 0;
|
| 682 |
|
|
}
|
| 683 |
|
|
goto errout;
|
| 684 |
|
|
}
|
| 685 |
|
|
}
|
| 686 |
|
|
|
| 687 |
|
|
/*
|
| 688 |
|
|
* Insert serial port into IRQ chain.
|
| 689 |
|
|
*/
|
| 690 |
|
|
info->prev_port = 0;
|
| 691 |
|
|
info->next_port = IRQ_ports[state->irq];
|
| 692 |
|
|
if (info->next_port)
|
| 693 |
|
|
info->next_port->prev_port = info;
|
| 694 |
|
|
IRQ_ports[state->irq] = info;
|
| 695 |
|
|
figure_IRQ_timeout(state->irq);
|
| 696 |
|
|
|
| 697 |
|
|
/*
|
| 698 |
|
|
* Clear the interrupt registers.
|
| 699 |
|
|
*/
|
| 700 |
|
|
sio_reg(info)->disr = 0;
|
| 701 |
|
|
|
| 702 |
|
|
/*
|
| 703 |
|
|
* Now, initialize the UART
|
| 704 |
|
|
*/
|
| 705 |
|
|
/* HW RTS/CTS control */
|
| 706 |
|
|
if (state->flags & ASYNC_HAVE_CTS_LINE)
|
| 707 |
|
|
sio_reg(info)->flcr = TXx927_SIFLCR_RCS | TXx927_SIFLCR_TES |
|
| 708 |
|
|
TXx927_SIFLCR_RTSTL_MAX /* 15 */;
|
| 709 |
|
|
/* Enable RX/TX */
|
| 710 |
|
|
sio_reg(info)->flcr &= ~(TXx927_SIFLCR_RSDE | TXx927_SIFLCR_TSDE);
|
| 711 |
|
|
|
| 712 |
|
|
/*
|
| 713 |
|
|
* Finally, enable interrupts
|
| 714 |
|
|
*/
|
| 715 |
|
|
sio_reg(info)->dicr = TXx927_SIDICR_RIE;
|
| 716 |
|
|
|
| 717 |
|
|
if (info->tty)
|
| 718 |
|
|
clear_bit(TTY_IO_ERROR, &info->tty->flags);
|
| 719 |
|
|
info->xmit.head = info->xmit.tail = 0;
|
| 720 |
|
|
|
| 721 |
|
|
/*
|
| 722 |
|
|
* Set up the tty->alt_speed kludge
|
| 723 |
|
|
*/
|
| 724 |
|
|
if (info->tty) {
|
| 725 |
|
|
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
|
| 726 |
|
|
info->tty->alt_speed = 57600;
|
| 727 |
|
|
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
|
| 728 |
|
|
info->tty->alt_speed = 115200;
|
| 729 |
|
|
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
|
| 730 |
|
|
info->tty->alt_speed = 230400;
|
| 731 |
|
|
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
|
| 732 |
|
|
info->tty->alt_speed = 460800;
|
| 733 |
|
|
}
|
| 734 |
|
|
|
| 735 |
|
|
/*
|
| 736 |
|
|
* and set the speed of the serial port
|
| 737 |
|
|
*/
|
| 738 |
|
|
change_speed(info, 0);
|
| 739 |
|
|
|
| 740 |
|
|
info->flags |= ASYNC_INITIALIZED;
|
| 741 |
|
|
restore_flags(flags);
|
| 742 |
|
|
return 0;
|
| 743 |
|
|
|
| 744 |
|
|
errout:
|
| 745 |
|
|
restore_flags(flags);
|
| 746 |
|
|
return retval;
|
| 747 |
|
|
}
|
| 748 |
|
|
|
| 749 |
|
|
/*
|
| 750 |
|
|
* This routine will shutdown a serial port; interrupts are disabled, and
|
| 751 |
|
|
* DTR is dropped if the hangup on close termio flag is on.
|
| 752 |
|
|
*/
|
| 753 |
|
|
static void shutdown(struct async_struct * info)
|
| 754 |
|
|
{
|
| 755 |
|
|
unsigned long flags;
|
| 756 |
|
|
struct serial_state *state;
|
| 757 |
|
|
int retval;
|
| 758 |
|
|
|
| 759 |
|
|
if (!(info->flags & ASYNC_INITIALIZED))
|
| 760 |
|
|
return;
|
| 761 |
|
|
|
| 762 |
|
|
state = info->state;
|
| 763 |
|
|
|
| 764 |
|
|
#ifdef SERIAL_DEBUG_OPEN
|
| 765 |
|
|
printk("Shutting down serial port %d (irq %d)....", info->line,
|
| 766 |
|
|
state->irq);
|
| 767 |
|
|
#endif
|
| 768 |
|
|
|
| 769 |
|
|
save_flags(flags); cli(); /* Disable interrupts */
|
| 770 |
|
|
|
| 771 |
|
|
/*
|
| 772 |
|
|
* First unlink the serial port from the IRQ chain...
|
| 773 |
|
|
*/
|
| 774 |
|
|
if (info->next_port)
|
| 775 |
|
|
info->next_port->prev_port = info->prev_port;
|
| 776 |
|
|
if (info->prev_port)
|
| 777 |
|
|
info->prev_port->next_port = info->next_port;
|
| 778 |
|
|
else
|
| 779 |
|
|
IRQ_ports[state->irq] = info->next_port;
|
| 780 |
|
|
figure_IRQ_timeout(state->irq);
|
| 781 |
|
|
|
| 782 |
|
|
/*
|
| 783 |
|
|
* Free the IRQ, if necessary
|
| 784 |
|
|
*/
|
| 785 |
|
|
if (state->irq && (!IRQ_ports[state->irq] ||
|
| 786 |
|
|
!IRQ_ports[state->irq]->next_port)) {
|
| 787 |
|
|
if (IRQ_ports[state->irq]) {
|
| 788 |
|
|
free_irq(state->irq, NULL);
|
| 789 |
|
|
retval = request_irq(state->irq, rs_interrupt_single,
|
| 790 |
|
|
SA_INTERRUPT, "txx927serial", NULL);
|
| 791 |
|
|
|
| 792 |
|
|
if (retval)
|
| 793 |
|
|
printk(KERN_WARNING "txx927serial shutdown: request_irq: error %d"
|
| 794 |
|
|
" Couldn't reacquire IRQ.\n", retval);
|
| 795 |
|
|
} else
|
| 796 |
|
|
free_irq(state->irq, NULL);
|
| 797 |
|
|
}
|
| 798 |
|
|
|
| 799 |
|
|
if (info->xmit.buf) {
|
| 800 |
|
|
free_page((unsigned long) info->xmit.buf);
|
| 801 |
|
|
info->xmit.buf = 0;
|
| 802 |
|
|
}
|
| 803 |
|
|
|
| 804 |
|
|
sio_reg(info)->dicr = 0; /* disable all intrs */
|
| 805 |
|
|
|
| 806 |
|
|
/* disable break condition */
|
| 807 |
|
|
sio_reg(info)->flcr &= ~TXx927_SIFLCR_TBRK;
|
| 808 |
|
|
|
| 809 |
|
|
if (!info->tty || (info->tty->termios->c_cflag & HUPCL)) {
|
| 810 |
|
|
/* drop RTS */
|
| 811 |
|
|
sio_reg(info)->flcr |= TXx927_SIFLCR_RTSSC|TXx927_SIFLCR_RSDE;
|
| 812 |
|
|
/* TXx927-SIO can not control DTR... */
|
| 813 |
|
|
}
|
| 814 |
|
|
|
| 815 |
|
|
/* reset FIFO's */
|
| 816 |
|
|
sio_reg(info)->fcr |= TXx927_SIFCR_TFRST | TXx927_SIFCR_RFRST |
|
| 817 |
|
|
TXx927_SIFCR_FRSTE;
|
| 818 |
|
|
/* clear reset */
|
| 819 |
|
|
sio_reg(info)->fcr &= ~(TXx927_SIFCR_TFRST | TXx927_SIFCR_RFRST |
|
| 820 |
|
|
TXx927_SIFCR_FRSTE);
|
| 821 |
|
|
|
| 822 |
|
|
/* DON'T disable Rx/Tx here, ie. DON'T set either
|
| 823 |
|
|
* TXx927_SIFLCR_RSDE or TXx927_SIFLCR_TSDE in flcr
|
| 824 |
|
|
*/
|
| 825 |
|
|
|
| 826 |
|
|
if (info->tty)
|
| 827 |
|
|
set_bit(TTY_IO_ERROR, &info->tty->flags);
|
| 828 |
|
|
|
| 829 |
|
|
info->flags &= ~ASYNC_INITIALIZED;
|
| 830 |
|
|
restore_flags(flags);
|
| 831 |
|
|
}
|
| 832 |
|
|
|
| 833 |
|
|
/*
|
| 834 |
|
|
* This routine is called to set the UART divisor registers to match
|
| 835 |
|
|
* the specified baud rate for a serial port.
|
| 836 |
|
|
*/
|
| 837 |
|
|
static void change_speed(struct async_struct *info,
|
| 838 |
|
|
struct termios *old_termios)
|
| 839 |
|
|
{
|
| 840 |
|
|
int quot = 0, baud_base, baud;
|
| 841 |
|
|
unsigned cflag, cval;
|
| 842 |
|
|
int bits;
|
| 843 |
|
|
unsigned long flags;
|
| 844 |
|
|
|
| 845 |
|
|
if (!info->tty || !info->tty->termios)
|
| 846 |
|
|
return;
|
| 847 |
|
|
cflag = info->tty->termios->c_cflag;
|
| 848 |
|
|
if (!info->port)
|
| 849 |
|
|
return;
|
| 850 |
|
|
|
| 851 |
|
|
cval = sio_reg(info)->lcr;
|
| 852 |
|
|
/* byte size and parity */
|
| 853 |
|
|
cval &= ~TXx927_SILCR_UMODE_MASK;
|
| 854 |
|
|
switch (cflag & CSIZE) {
|
| 855 |
|
|
case CS7:
|
| 856 |
|
|
cval |= TXx927_SILCR_UMODE_7BIT;
|
| 857 |
|
|
bits = 9;
|
| 858 |
|
|
break;
|
| 859 |
|
|
case CS5: /* not supported */
|
| 860 |
|
|
case CS6: /* not supported */
|
| 861 |
|
|
case CS8:
|
| 862 |
|
|
default:
|
| 863 |
|
|
cval |= TXx927_SILCR_UMODE_8BIT;
|
| 864 |
|
|
bits = 10;
|
| 865 |
|
|
break;
|
| 866 |
|
|
}
|
| 867 |
|
|
cval &= ~TXx927_SILCR_USBL_MASK;
|
| 868 |
|
|
if (cflag & CSTOPB) {
|
| 869 |
|
|
cval |= TXx927_SILCR_USBL_2BIT;
|
| 870 |
|
|
bits++;
|
| 871 |
|
|
} else {
|
| 872 |
|
|
cval |= TXx927_SILCR_USBL_1BIT;
|
| 873 |
|
|
}
|
| 874 |
|
|
|
| 875 |
|
|
cval &= ~(TXx927_SILCR_UPEN|TXx927_SILCR_UEPS);
|
| 876 |
|
|
if (cflag & PARENB) {
|
| 877 |
|
|
cval |= TXx927_SILCR_UPEN;
|
| 878 |
|
|
bits++;
|
| 879 |
|
|
}
|
| 880 |
|
|
if (!(cflag & PARODD))
|
| 881 |
|
|
cval |= TXx927_SILCR_UEPS;
|
| 882 |
|
|
|
| 883 |
|
|
/* Determine divisor based on baud rate */
|
| 884 |
|
|
baud = tty_get_baud_rate(info->tty);
|
| 885 |
|
|
if (!baud)
|
| 886 |
|
|
baud = 9600; /* B0 transition handled in rs_set_termios */
|
| 887 |
|
|
baud_base = info->state->baud_base;
|
| 888 |
|
|
quot = (baud_base + baud / 2) / baud;
|
| 889 |
|
|
/* If the quotient is zero refuse the change */
|
| 890 |
|
|
if (!quot && old_termios) {
|
| 891 |
|
|
info->tty->termios->c_cflag &= ~CBAUD;
|
| 892 |
|
|
info->tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD);
|
| 893 |
|
|
baud = tty_get_baud_rate(info->tty);
|
| 894 |
|
|
if (!baud)
|
| 895 |
|
|
baud = 9600;
|
| 896 |
|
|
quot = (baud_base + baud / 2) / baud;
|
| 897 |
|
|
}
|
| 898 |
|
|
/* As a last resort, if the quotient is zero, default to 9600 bps */
|
| 899 |
|
|
if (!quot)
|
| 900 |
|
|
quot = (baud_base + 9600 / 2) / 9600;
|
| 901 |
|
|
info->quot = quot;
|
| 902 |
|
|
info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base);
|
| 903 |
|
|
info->timeout += HZ/50; /* Add .02 seconds of slop */
|
| 904 |
|
|
|
| 905 |
|
|
/* CTS flow control flag */
|
| 906 |
|
|
if (cflag & CRTSCTS) {
|
| 907 |
|
|
info->flags |= ASYNC_CTS_FLOW;
|
| 908 |
|
|
if (info->state->flags & ASYNC_HAVE_CTS_LINE)
|
| 909 |
|
|
sio_reg(info)->flcr = TXx927_SIFLCR_RCS | TXx927_SIFLCR_TES |
|
| 910 |
|
|
TXx927_SIFLCR_RTSTL_MAX /* 15 */;
|
| 911 |
|
|
} else {
|
| 912 |
|
|
info->flags &= ~ASYNC_CTS_FLOW;
|
| 913 |
|
|
sio_reg(info)->flcr &= ~(TXx927_SIFLCR_RCS | TXx927_SIFLCR_TES | TXx927_SIFLCR_RSDE | TXx927_SIFLCR_TSDE);
|
| 914 |
|
|
}
|
| 915 |
|
|
|
| 916 |
|
|
/*
|
| 917 |
|
|
* Set up parity check flag
|
| 918 |
|
|
*/
|
| 919 |
|
|
#define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
|
| 920 |
|
|
|
| 921 |
|
|
info->read_status_mask = TXx927_SIDISR_UOER |
|
| 922 |
|
|
TXx927_SIDISR_TDIS | TXx927_SIDISR_RDIS;
|
| 923 |
|
|
if (I_INPCK(info->tty))
|
| 924 |
|
|
info->read_status_mask |= TXx927_SIDISR_UFER | TXx927_SIDISR_UPER;
|
| 925 |
|
|
if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
|
| 926 |
|
|
info->read_status_mask |= TXx927_SIDISR_UBRK;
|
| 927 |
|
|
|
| 928 |
|
|
/*
|
| 929 |
|
|
* Characters to ignore
|
| 930 |
|
|
*/
|
| 931 |
|
|
info->ignore_status_mask = 0;
|
| 932 |
|
|
if (I_IGNPAR(info->tty))
|
| 933 |
|
|
info->ignore_status_mask |= TXx927_SIDISR_UPER | TXx927_SIDISR_UFER;
|
| 934 |
|
|
if (I_IGNBRK(info->tty)) {
|
| 935 |
|
|
info->ignore_status_mask |= TXx927_SIDISR_UBRK;
|
| 936 |
|
|
/*
|
| 937 |
|
|
* If we're ignore parity and break indicators, ignore
|
| 938 |
|
|
* overruns too. (For real raw support).
|
| 939 |
|
|
*/
|
| 940 |
|
|
if (I_IGNPAR(info->tty))
|
| 941 |
|
|
info->ignore_status_mask |= TXx927_SIDISR_UOER;
|
| 942 |
|
|
}
|
| 943 |
|
|
/*
|
| 944 |
|
|
* !!! ignore all characters if CREAD is not set
|
| 945 |
|
|
*/
|
| 946 |
|
|
if ((cflag & CREAD) == 0)
|
| 947 |
|
|
info->ignore_status_mask |= TXx927_SIDISR_RDIS;
|
| 948 |
|
|
save_flags(flags); cli();
|
| 949 |
|
|
sio_reg(info)->lcr = cval | TXx927_SILCR_SCS_IMCLK_BG;
|
| 950 |
|
|
sio_reg(info)->bgr = quot | TXx927_SIBGR_BCLK_T0;
|
| 951 |
|
|
restore_flags(flags);
|
| 952 |
|
|
}
|
| 953 |
|
|
|
| 954 |
|
|
static void rs_put_char(struct tty_struct *tty, unsigned char ch)
|
| 955 |
|
|
{
|
| 956 |
|
|
struct async_struct *info = (struct async_struct *)tty->driver_data;
|
| 957 |
|
|
unsigned long flags;
|
| 958 |
|
|
|
| 959 |
|
|
if (serial_paranoia_check(info, tty->device, "rs_put_char"))
|
| 960 |
|
|
return;
|
| 961 |
|
|
|
| 962 |
|
|
if (!tty || !info->xmit.buf)
|
| 963 |
|
|
return;
|
| 964 |
|
|
|
| 965 |
|
|
save_flags(flags); cli();
|
| 966 |
|
|
if (CIRC_SPACE(info->xmit.head,
|
| 967 |
|
|
info->xmit.tail,
|
| 968 |
|
|
SERIAL_XMIT_SIZE) == 0) {
|
| 969 |
|
|
restore_flags(flags);
|
| 970 |
|
|
return;
|
| 971 |
|
|
}
|
| 972 |
|
|
|
| 973 |
|
|
info->xmit.buf[info->xmit.head++] = ch;
|
| 974 |
|
|
info->xmit.head &= SERIAL_XMIT_SIZE-1;
|
| 975 |
|
|
restore_flags(flags);
|
| 976 |
|
|
}
|
| 977 |
|
|
|
| 978 |
|
|
static void rs_flush_chars(struct tty_struct *tty)
|
| 979 |
|
|
{
|
| 980 |
|
|
struct async_struct *info = (struct async_struct *)tty->driver_data;
|
| 981 |
|
|
unsigned long flags;
|
| 982 |
|
|
|
| 983 |
|
|
if (serial_paranoia_check(info, tty->device, "rs_flush_chars"))
|
| 984 |
|
|
return;
|
| 985 |
|
|
|
| 986 |
|
|
if (info->xmit.head == info->xmit.tail
|
| 987 |
|
|
|| tty->stopped
|
| 988 |
|
|
|| tty->hw_stopped
|
| 989 |
|
|
|| !info->xmit.buf)
|
| 990 |
|
|
return;
|
| 991 |
|
|
|
| 992 |
|
|
save_flags(flags); cli();
|
| 993 |
|
|
sio_reg(info)->dicr |= TXx927_SIDICR_TIE;
|
| 994 |
|
|
restore_flags(flags);
|
| 995 |
|
|
}
|
| 996 |
|
|
|
| 997 |
|
|
static int rs_write(struct tty_struct * tty, int from_user,
|
| 998 |
|
|
const unsigned char *buf, int count)
|
| 999 |
|
|
{
|
| 1000 |
|
|
int c, ret = 0;
|
| 1001 |
|
|
struct async_struct *info = (struct async_struct *)tty->driver_data;
|
| 1002 |
|
|
unsigned long flags;
|
| 1003 |
|
|
|
| 1004 |
|
|
if (serial_paranoia_check(info, tty->device, "rs_write"))
|
| 1005 |
|
|
return 0;
|
| 1006 |
|
|
|
| 1007 |
|
|
if (!tty || !info->xmit.buf || !tmp_buf)
|
| 1008 |
|
|
return 0;
|
| 1009 |
|
|
|
| 1010 |
|
|
save_flags(flags);
|
| 1011 |
|
|
|
| 1012 |
|
|
if (from_user) {
|
| 1013 |
|
|
down(&tmp_buf_sem);
|
| 1014 |
|
|
while (1) {
|
| 1015 |
|
|
int c1;
|
| 1016 |
|
|
c = CIRC_SPACE_TO_END(info->xmit.head,
|
| 1017 |
|
|
info->xmit.tail,
|
| 1018 |
|
|
SERIAL_XMIT_SIZE);
|
| 1019 |
|
|
|
| 1020 |
|
|
if (count < c)
|
| 1021 |
|
|
c = count;
|
| 1022 |
|
|
if (c <= 0)
|
| 1023 |
|
|
break;
|
| 1024 |
|
|
|
| 1025 |
|
|
c -= copy_from_user(tmp_buf, buf, c);
|
| 1026 |
|
|
if (!c) {
|
| 1027 |
|
|
if (!ret)
|
| 1028 |
|
|
ret = -EFAULT;
|
| 1029 |
|
|
break;
|
| 1030 |
|
|
}
|
| 1031 |
|
|
cli();
|
| 1032 |
|
|
c1 = CIRC_SPACE_TO_END(info->xmit.head,
|
| 1033 |
|
|
info->xmit.tail,
|
| 1034 |
|
|
SERIAL_XMIT_SIZE);
|
| 1035 |
|
|
|
| 1036 |
|
|
if (c1 < c)
|
| 1037 |
|
|
c = c1;
|
| 1038 |
|
|
memcpy(info->xmit.buf + info->xmit.head, tmp_buf, c);
|
| 1039 |
|
|
info->xmit.head = ((info->xmit.head + c) &
|
| 1040 |
|
|
(SERIAL_XMIT_SIZE-1));
|
| 1041 |
|
|
restore_flags(flags);
|
| 1042 |
|
|
buf += c;
|
| 1043 |
|
|
count -= c;
|
| 1044 |
|
|
ret += c;
|
| 1045 |
|
|
}
|
| 1046 |
|
|
up(&tmp_buf_sem);
|
| 1047 |
|
|
} else {
|
| 1048 |
|
|
cli();
|
| 1049 |
|
|
while (1) {
|
| 1050 |
|
|
c = CIRC_SPACE_TO_END(info->xmit.head,
|
| 1051 |
|
|
info->xmit.tail,
|
| 1052 |
|
|
SERIAL_XMIT_SIZE);
|
| 1053 |
|
|
|
| 1054 |
|
|
if (count < c)
|
| 1055 |
|
|
c = count;
|
| 1056 |
|
|
if (c <= 0) {
|
| 1057 |
|
|
break;
|
| 1058 |
|
|
}
|
| 1059 |
|
|
memcpy(info->xmit.buf + info->xmit.head, buf, c);
|
| 1060 |
|
|
info->xmit.head = ((info->xmit.head + c) &
|
| 1061 |
|
|
(SERIAL_XMIT_SIZE-1));
|
| 1062 |
|
|
buf += c;
|
| 1063 |
|
|
count -= c;
|
| 1064 |
|
|
ret += c;
|
| 1065 |
|
|
}
|
| 1066 |
|
|
restore_flags(flags);
|
| 1067 |
|
|
}
|
| 1068 |
|
|
if (info->xmit.head != info->xmit.tail
|
| 1069 |
|
|
&& !tty->stopped
|
| 1070 |
|
|
&& !tty->hw_stopped
|
| 1071 |
|
|
&& !(info->IER & UART_IER_THRI))
|
| 1072 |
|
|
sio_reg(info)->dicr |= TXx927_SIDICR_TIE;
|
| 1073 |
|
|
|
| 1074 |
|
|
return ret;
|
| 1075 |
|
|
}
|
| 1076 |
|
|
|
| 1077 |
|
|
static int rs_write_room(struct tty_struct *tty)
|
| 1078 |
|
|
{
|
| 1079 |
|
|
struct async_struct *info = (struct async_struct *)tty->driver_data;
|
| 1080 |
|
|
|
| 1081 |
|
|
if (serial_paranoia_check(info, tty->device, "rs_write_room"))
|
| 1082 |
|
|
return 0;
|
| 1083 |
|
|
|
| 1084 |
|
|
return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
|
| 1085 |
|
|
}
|
| 1086 |
|
|
|
| 1087 |
|
|
static int rs_chars_in_buffer(struct tty_struct *tty)
|
| 1088 |
|
|
{
|
| 1089 |
|
|
struct async_struct *info = (struct async_struct *)tty->driver_data;
|
| 1090 |
|
|
|
| 1091 |
|
|
if (serial_paranoia_check(info, tty->device, "rs_chars_in_buffer"))
|
| 1092 |
|
|
return 0;
|
| 1093 |
|
|
|
| 1094 |
|
|
return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
|
| 1095 |
|
|
}
|
| 1096 |
|
|
|
| 1097 |
|
|
static void rs_flush_buffer(struct tty_struct *tty)
|
| 1098 |
|
|
{
|
| 1099 |
|
|
struct async_struct *info = (struct async_struct *)tty->driver_data;
|
| 1100 |
|
|
unsigned long flags;
|
| 1101 |
|
|
|
| 1102 |
|
|
if (serial_paranoia_check(info, tty->device, "rs_flush_buffer"))
|
| 1103 |
|
|
return;
|
| 1104 |
|
|
save_flags(flags); cli();
|
| 1105 |
|
|
info->xmit.head = info->xmit.tail = 0;
|
| 1106 |
|
|
restore_flags(flags);
|
| 1107 |
|
|
wake_up_interruptible(&tty->write_wait);
|
| 1108 |
|
|
#ifdef SERIAL_HAVE_POLL_WAIT
|
| 1109 |
|
|
wake_up_interruptible(&tty->poll_wait);
|
| 1110 |
|
|
#endif
|
| 1111 |
|
|
if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
|
| 1112 |
|
|
tty->ldisc.write_wakeup)
|
| 1113 |
|
|
(tty->ldisc.write_wakeup)(tty);
|
| 1114 |
|
|
}
|
| 1115 |
|
|
|
| 1116 |
|
|
/*
|
| 1117 |
|
|
* This function is used to send a high-priority XON/XOFF character to
|
| 1118 |
|
|
* the device
|
| 1119 |
|
|
*/
|
| 1120 |
|
|
static void rs_send_xchar(struct tty_struct *tty, char ch)
|
| 1121 |
|
|
{
|
| 1122 |
|
|
struct async_struct *info = (struct async_struct *)tty->driver_data;
|
| 1123 |
|
|
|
| 1124 |
|
|
|
| 1125 |
|
|
if (serial_paranoia_check(info, tty->device, "rs_send_char"))
|
| 1126 |
|
|
return;
|
| 1127 |
|
|
|
| 1128 |
|
|
info->x_char = ch;
|
| 1129 |
|
|
if (ch) {
|
| 1130 |
|
|
/* Make sure transmit interrupts are on */
|
| 1131 |
|
|
sio_reg(info)->dicr |= TXx927_SIDICR_TIE;
|
| 1132 |
|
|
}
|
| 1133 |
|
|
}
|
| 1134 |
|
|
|
| 1135 |
|
|
/*
|
| 1136 |
|
|
* ------------------------------------------------------------
|
| 1137 |
|
|
* rs_throttle()
|
| 1138 |
|
|
*
|
| 1139 |
|
|
* This routine is called by the upper-layer tty layer to signal that
|
| 1140 |
|
|
* incoming characters should be throttled.
|
| 1141 |
|
|
* ------------------------------------------------------------
|
| 1142 |
|
|
*/
|
| 1143 |
|
|
static void rs_throttle(struct tty_struct * tty)
|
| 1144 |
|
|
{
|
| 1145 |
|
|
struct async_struct *info = (struct async_struct *)tty->driver_data;
|
| 1146 |
|
|
unsigned long flags;
|
| 1147 |
|
|
#ifdef SERIAL_DEBUG_THROTTLE
|
| 1148 |
|
|
char buf[64];
|
| 1149 |
|
|
|
| 1150 |
|
|
printk("throttle %s: %d....\n", tty_name(tty, buf),
|
| 1151 |
|
|
tty->ldisc.chars_in_buffer(tty));
|
| 1152 |
|
|
#endif
|
| 1153 |
|
|
|
| 1154 |
|
|
if (serial_paranoia_check(info, tty->device, "rs_throttle"))
|
| 1155 |
|
|
return;
|
| 1156 |
|
|
|
| 1157 |
|
|
if (I_IXOFF(tty))
|
| 1158 |
|
|
rs_send_xchar(tty, STOP_CHAR(tty));
|
| 1159 |
|
|
|
| 1160 |
|
|
if (tty->termios->c_cflag & CRTSCTS) {
|
| 1161 |
|
|
save_flags(flags); cli();
|
| 1162 |
|
|
/* drop RTS */
|
| 1163 |
|
|
sio_reg(info)->flcr |= TXx927_SIFLCR_RTSSC|TXx927_SIFLCR_RSDE;
|
| 1164 |
|
|
restore_flags(flags);
|
| 1165 |
|
|
}
|
| 1166 |
|
|
}
|
| 1167 |
|
|
|
| 1168 |
|
|
static void rs_unthrottle(struct tty_struct * tty)
|
| 1169 |
|
|
{
|
| 1170 |
|
|
struct async_struct *info = (struct async_struct *)tty->driver_data;
|
| 1171 |
|
|
unsigned long flags;
|
| 1172 |
|
|
#ifdef SERIAL_DEBUG_THROTTLE
|
| 1173 |
|
|
char buf[64];
|
| 1174 |
|
|
|
| 1175 |
|
|
printk("unthrottle %s: %d....\n", tty_name(tty, buf),
|
| 1176 |
|
|
tty->ldisc.chars_in_buffer(tty));
|
| 1177 |
|
|
#endif
|
| 1178 |
|
|
|
| 1179 |
|
|
if (serial_paranoia_check(info, tty->device, "rs_unthrottle"))
|
| 1180 |
|
|
return;
|
| 1181 |
|
|
|
| 1182 |
|
|
if (I_IXOFF(tty)) {
|
| 1183 |
|
|
if (info->x_char)
|
| 1184 |
|
|
info->x_char = 0;
|
| 1185 |
|
|
else
|
| 1186 |
|
|
rs_send_xchar(tty, START_CHAR(tty));
|
| 1187 |
|
|
}
|
| 1188 |
|
|
if (tty->termios->c_cflag & CRTSCTS) {
|
| 1189 |
|
|
save_flags(flags); cli();
|
| 1190 |
|
|
sio_reg(info)->flcr &= ~(TXx927_SIFLCR_RTSSC|TXx927_SIFLCR_RSDE);
|
| 1191 |
|
|
restore_flags(flags);
|
| 1192 |
|
|
}
|
| 1193 |
|
|
}
|
| 1194 |
|
|
|
| 1195 |
|
|
/*
|
| 1196 |
|
|
* ------------------------------------------------------------
|
| 1197 |
|
|
* rs_ioctl() and friends
|
| 1198 |
|
|
* ------------------------------------------------------------
|
| 1199 |
|
|
*/
|
| 1200 |
|
|
|
| 1201 |
|
|
static int get_modem_info(struct async_struct * info, unsigned int *value)
|
| 1202 |
|
|
{
|
| 1203 |
|
|
unsigned int result;
|
| 1204 |
|
|
unsigned long flags;
|
| 1205 |
|
|
|
| 1206 |
|
|
save_flags(flags); cli();
|
| 1207 |
|
|
result = ((sio_reg(info)->flcr & TXx927_SIFLCR_RTSSC) ? 0 : TIOCM_RTS)
|
| 1208 |
|
|
| ((sio_reg(info)->cisr & TXx927_SICISR_CTSS) ? 0 : TIOCM_CTS);
|
| 1209 |
|
|
restore_flags(flags);
|
| 1210 |
|
|
return put_user(result,value);
|
| 1211 |
|
|
}
|
| 1212 |
|
|
|
| 1213 |
|
|
static int set_modem_info(struct async_struct * info, unsigned int cmd,
|
| 1214 |
|
|
unsigned int *value)
|
| 1215 |
|
|
{
|
| 1216 |
|
|
int error;
|
| 1217 |
|
|
unsigned int arg;
|
| 1218 |
|
|
unsigned long flags;
|
| 1219 |
|
|
|
| 1220 |
|
|
error = get_user(arg, value);
|
| 1221 |
|
|
if (error)
|
| 1222 |
|
|
return error;
|
| 1223 |
|
|
save_flags(flags); cli();
|
| 1224 |
|
|
switch (cmd) {
|
| 1225 |
|
|
case TIOCMBIS:
|
| 1226 |
|
|
if (arg & TIOCM_RTS)
|
| 1227 |
|
|
sio_reg(info)->flcr &= ~(TXx927_SIFLCR_RTSSC|TXx927_SIFLCR_RSDE);
|
| 1228 |
|
|
break;
|
| 1229 |
|
|
case TIOCMBIC:
|
| 1230 |
|
|
if (arg & TIOCM_RTS)
|
| 1231 |
|
|
sio_reg(info)->flcr |= TXx927_SIFLCR_RTSSC|TXx927_SIFLCR_RSDE;
|
| 1232 |
|
|
break;
|
| 1233 |
|
|
case TIOCMSET:
|
| 1234 |
|
|
sio_reg(info)->flcr =
|
| 1235 |
|
|
(sio_reg(info)->flcr & ~(TXx927_SIFLCR_RTSSC|TXx927_SIFLCR_RSDE)) |
|
| 1236 |
|
|
((arg & TIOCM_RTS) ? 0 : TXx927_SIFLCR_RTSSC|TXx927_SIFLCR_RSDE);
|
| 1237 |
|
|
break;
|
| 1238 |
|
|
default:
|
| 1239 |
|
|
error = -EINVAL;
|
| 1240 |
|
|
}
|
| 1241 |
|
|
restore_flags(flags);
|
| 1242 |
|
|
return error;
|
| 1243 |
|
|
}
|
| 1244 |
|
|
|
| 1245 |
|
|
/*
|
| 1246 |
|
|
* rs_break() --- routine which turns the break handling on or off
|
| 1247 |
|
|
*/
|
| 1248 |
|
|
static void rs_break(struct tty_struct *tty, int break_state)
|
| 1249 |
|
|
{
|
| 1250 |
|
|
struct async_struct * info = (struct async_struct *)tty->driver_data;
|
| 1251 |
|
|
unsigned long flags;
|
| 1252 |
|
|
|
| 1253 |
|
|
if (serial_paranoia_check(info, tty->device, "rs_break"))
|
| 1254 |
|
|
return;
|
| 1255 |
|
|
|
| 1256 |
|
|
if (!info->port)
|
| 1257 |
|
|
return;
|
| 1258 |
|
|
save_flags(flags); cli();
|
| 1259 |
|
|
if (break_state == -1)
|
| 1260 |
|
|
sio_reg(info)->flcr |= TXx927_SIFLCR_TBRK;
|
| 1261 |
|
|
else
|
| 1262 |
|
|
sio_reg(info)->flcr &= ~TXx927_SIFLCR_TBRK;
|
| 1263 |
|
|
restore_flags(flags);
|
| 1264 |
|
|
}
|
| 1265 |
|
|
|
| 1266 |
|
|
static int rs_ioctl(struct tty_struct *tty, struct file * file,
|
| 1267 |
|
|
unsigned int cmd, unsigned long arg)
|
| 1268 |
|
|
{
|
| 1269 |
|
|
struct async_struct * info = (struct async_struct *)tty->driver_data;
|
| 1270 |
|
|
|
| 1271 |
|
|
if (serial_paranoia_check(info, tty->device, "rs_ioctl"))
|
| 1272 |
|
|
return -ENODEV;
|
| 1273 |
|
|
|
| 1274 |
|
|
if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
|
| 1275 |
|
|
(cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
|
| 1276 |
|
|
(cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
|
| 1277 |
|
|
if (tty->flags & (1 << TTY_IO_ERROR))
|
| 1278 |
|
|
return -EIO;
|
| 1279 |
|
|
}
|
| 1280 |
|
|
|
| 1281 |
|
|
switch (cmd) {
|
| 1282 |
|
|
case TIOCMGET:
|
| 1283 |
|
|
return get_modem_info(info, (unsigned int *) arg);
|
| 1284 |
|
|
case TIOCMBIS:
|
| 1285 |
|
|
case TIOCMBIC:
|
| 1286 |
|
|
case TIOCMSET:
|
| 1287 |
|
|
return set_modem_info(info, cmd, (unsigned int *) arg);
|
| 1288 |
|
|
return 0;
|
| 1289 |
|
|
case TIOCGSERIAL:
|
| 1290 |
|
|
printk("TIOCGSERIAL\n");
|
| 1291 |
|
|
return 0;
|
| 1292 |
|
|
case TIOCSSERIAL:
|
| 1293 |
|
|
printk("TIOCSSERIAL\n");
|
| 1294 |
|
|
return 0;
|
| 1295 |
|
|
case TIOCSERCONFIG:
|
| 1296 |
|
|
printk("TIOCSERCONFIG\n");
|
| 1297 |
|
|
return 0;
|
| 1298 |
|
|
|
| 1299 |
|
|
case TIOCSERGETLSR: /* Get line status register */
|
| 1300 |
|
|
printk("TIOCSERGETLSR\n");
|
| 1301 |
|
|
return 0;
|
| 1302 |
|
|
|
| 1303 |
|
|
case TIOCSERGSTRUCT:
|
| 1304 |
|
|
printk("TIOCSERGSTRUCT\n");
|
| 1305 |
|
|
return 0;
|
| 1306 |
|
|
|
| 1307 |
|
|
/*
|
| 1308 |
|
|
* Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
|
| 1309 |
|
|
* - mask passed in arg for lines of interest
|
| 1310 |
|
|
* (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
|
| 1311 |
|
|
* Caller should use TIOCGICOUNT to see which one it was
|
| 1312 |
|
|
*/
|
| 1313 |
|
|
case TIOCMIWAIT:
|
| 1314 |
|
|
printk("TIOCMIWAIT\n");
|
| 1315 |
|
|
return 0;
|
| 1316 |
|
|
|
| 1317 |
|
|
/*
|
| 1318 |
|
|
* Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
|
| 1319 |
|
|
* Return: write counters to the user passed counter struct
|
| 1320 |
|
|
* NB: both 1->0 and 0->1 transitions are counted except for
|
| 1321 |
|
|
* RI where only 0->1 is counted.
|
| 1322 |
|
|
*/
|
| 1323 |
|
|
case TIOCGICOUNT:
|
| 1324 |
|
|
printk("TIOCGICOUNT\n");
|
| 1325 |
|
|
return 0;
|
| 1326 |
|
|
|
| 1327 |
|
|
case TIOCSERGWILD:
|
| 1328 |
|
|
case TIOCSERSWILD:
|
| 1329 |
|
|
/* "setserial -W" is called in Debian boot */
|
| 1330 |
|
|
printk ("TIOCSER?WILD ioctl obsolete, ignored.\n");
|
| 1331 |
|
|
return 0;
|
| 1332 |
|
|
|
| 1333 |
|
|
default:
|
| 1334 |
|
|
return -ENOIOCTLCMD;
|
| 1335 |
|
|
}
|
| 1336 |
|
|
return 0;
|
| 1337 |
|
|
}
|
| 1338 |
|
|
|
| 1339 |
|
|
static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios)
|
| 1340 |
|
|
{
|
| 1341 |
|
|
struct async_struct *info = (struct async_struct *)tty->driver_data;
|
| 1342 |
|
|
unsigned long flags;
|
| 1343 |
|
|
unsigned int cflag = tty->termios->c_cflag;
|
| 1344 |
|
|
|
| 1345 |
|
|
if ( (cflag == old_termios->c_cflag)
|
| 1346 |
|
|
&& ( RELEVANT_IFLAG(tty->termios->c_iflag)
|
| 1347 |
|
|
== RELEVANT_IFLAG(old_termios->c_iflag)))
|
| 1348 |
|
|
return;
|
| 1349 |
|
|
|
| 1350 |
|
|
change_speed(info, old_termios);
|
| 1351 |
|
|
|
| 1352 |
|
|
/* Handle transition to B0 status */
|
| 1353 |
|
|
if ((old_termios->c_cflag & CBAUD) &&
|
| 1354 |
|
|
!(cflag & CBAUD)) {
|
| 1355 |
|
|
save_flags(flags); cli();
|
| 1356 |
|
|
sio_reg(info)->flcr |= TXx927_SIFLCR_RTSSC|TXx927_SIFLCR_RSDE;
|
| 1357 |
|
|
restore_flags(flags);
|
| 1358 |
|
|
}
|
| 1359 |
|
|
|
| 1360 |
|
|
/* Handle transition away from B0 status */
|
| 1361 |
|
|
if (!(old_termios->c_cflag & CBAUD) &&
|
| 1362 |
|
|
(cflag & CBAUD)) {
|
| 1363 |
|
|
if (!(tty->termios->c_cflag & CRTSCTS) ||
|
| 1364 |
|
|
!test_bit(TTY_THROTTLED, &tty->flags)) {
|
| 1365 |
|
|
save_flags(flags); cli();
|
| 1366 |
|
|
sio_reg(info)->flcr &= ~(TXx927_SIFLCR_RTSSC|TXx927_SIFLCR_RSDE);
|
| 1367 |
|
|
restore_flags(flags);
|
| 1368 |
|
|
}
|
| 1369 |
|
|
}
|
| 1370 |
|
|
|
| 1371 |
|
|
/* Handle turning off CRTSCTS */
|
| 1372 |
|
|
if ((old_termios->c_cflag & CRTSCTS) &&
|
| 1373 |
|
|
!(tty->termios->c_cflag & CRTSCTS)) {
|
| 1374 |
|
|
tty->hw_stopped = 0;
|
| 1375 |
|
|
rs_start(tty);
|
| 1376 |
|
|
}
|
| 1377 |
|
|
}
|
| 1378 |
|
|
|
| 1379 |
|
|
/*
|
| 1380 |
|
|
* ------------------------------------------------------------
|
| 1381 |
|
|
* rs_close()
|
| 1382 |
|
|
*
|
| 1383 |
|
|
* This routine is called when the serial port gets closed. First, we
|
| 1384 |
|
|
* wait for the last remaining data to be sent. Then, we unlink its
|
| 1385 |
|
|
* async structure from the interrupt chain if necessary, and we free
|
| 1386 |
|
|
* that IRQ if nothing is left in the chain.
|
| 1387 |
|
|
* ------------------------------------------------------------
|
| 1388 |
|
|
*/
|
| 1389 |
|
|
static void rs_close(struct tty_struct *tty, struct file * filp)
|
| 1390 |
|
|
{
|
| 1391 |
|
|
struct async_struct * info = (struct async_struct *)tty->driver_data;
|
| 1392 |
|
|
struct serial_state *state;
|
| 1393 |
|
|
unsigned long flags;
|
| 1394 |
|
|
|
| 1395 |
|
|
if (!info || serial_paranoia_check(info, tty->device, "rs_close"))
|
| 1396 |
|
|
return;
|
| 1397 |
|
|
|
| 1398 |
|
|
state = info->state;
|
| 1399 |
|
|
|
| 1400 |
|
|
save_flags(flags); cli();
|
| 1401 |
|
|
|
| 1402 |
|
|
if (tty_hung_up_p(filp)) {
|
| 1403 |
|
|
restore_flags(flags);
|
| 1404 |
|
|
return;
|
| 1405 |
|
|
}
|
| 1406 |
|
|
|
| 1407 |
|
|
#ifdef SERIAL_DEBUG_OPEN
|
| 1408 |
|
|
printk("rs_close ttys%d, count = %d\n", info->line, state->count);
|
| 1409 |
|
|
#endif
|
| 1410 |
|
|
if ((tty->count == 1) && (state->count != 1)) {
|
| 1411 |
|
|
/*
|
| 1412 |
|
|
* Uh, oh. tty->count is 1, which means that the tty
|
| 1413 |
|
|
* structure will be freed. state->count should always
|
| 1414 |
|
|
* be one in these conditions. If it's greater than
|
| 1415 |
|
|
* one, we've got real problems, since it means the
|
| 1416 |
|
|
* serial port won't be shutdown.
|
| 1417 |
|
|
*/
|
| 1418 |
|
|
printk(KERN_WARNING "rs_close: bad serial port count; tty->count is 1, "
|
| 1419 |
|
|
"state->count is %d\n", state->count);
|
| 1420 |
|
|
state->count = 1;
|
| 1421 |
|
|
}
|
| 1422 |
|
|
if (--state->count < 0) {
|
| 1423 |
|
|
printk(KERN_WARNING "rs_close: bad serial port count for ttys%d: %d\n",
|
| 1424 |
|
|
info->line, state->count);
|
| 1425 |
|
|
state->count = 0;
|
| 1426 |
|
|
}
|
| 1427 |
|
|
if (state->count) {
|
| 1428 |
|
|
restore_flags(flags);
|
| 1429 |
|
|
return;
|
| 1430 |
|
|
}
|
| 1431 |
|
|
info->flags |= ASYNC_CLOSING;
|
| 1432 |
|
|
/*
|
| 1433 |
|
|
* Save the termios structure, since this port may have
|
| 1434 |
|
|
* separate termios for callout and dialin.
|
| 1435 |
|
|
*/
|
| 1436 |
|
|
if (info->flags & ASYNC_NORMAL_ACTIVE)
|
| 1437 |
|
|
info->state->normal_termios = *tty->termios;
|
| 1438 |
|
|
if (info->flags & ASYNC_CALLOUT_ACTIVE)
|
| 1439 |
|
|
info->state->callout_termios = *tty->termios;
|
| 1440 |
|
|
/*
|
| 1441 |
|
|
* Now we wait for the transmit buffer to clear; and we notify
|
| 1442 |
|
|
* the line discipline to only process XON/XOFF characters.
|
| 1443 |
|
|
*/
|
| 1444 |
|
|
tty->closing = 1;
|
| 1445 |
|
|
if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
|
| 1446 |
|
|
tty_wait_until_sent(tty, info->closing_wait);
|
| 1447 |
|
|
/*
|
| 1448 |
|
|
* At this point we stop accepting input. To do this, we
|
| 1449 |
|
|
* disable the receive line status interrupts, and tell the
|
| 1450 |
|
|
* interrupt driver to stop checking the data ready bit in the
|
| 1451 |
|
|
* line status register.
|
| 1452 |
|
|
*/
|
| 1453 |
|
|
info->read_status_mask &= ~TXx927_SIDISR_RDIS;
|
| 1454 |
|
|
if (info->flags & ASYNC_INITIALIZED) {
|
| 1455 |
|
|
#if 0
|
| 1456 |
|
|
sio_reg(info)->dicr &= ~TXx927_SIDICR_RIE;
|
| 1457 |
|
|
#endif
|
| 1458 |
|
|
/*
|
| 1459 |
|
|
* Before we drop DTR, make sure the UART transmitter
|
| 1460 |
|
|
* has completely drained; this is especially
|
| 1461 |
|
|
* important if there is a transmit FIFO!
|
| 1462 |
|
|
*/
|
| 1463 |
|
|
rs_wait_until_sent(tty, info->timeout);
|
| 1464 |
|
|
}
|
| 1465 |
|
|
shutdown(info);
|
| 1466 |
|
|
if (tty->driver.flush_buffer)
|
| 1467 |
|
|
tty->driver.flush_buffer(tty);
|
| 1468 |
|
|
if (tty->ldisc.flush_buffer)
|
| 1469 |
|
|
tty->ldisc.flush_buffer(tty);
|
| 1470 |
|
|
tty->closing = 0;
|
| 1471 |
|
|
info->event = 0;
|
| 1472 |
|
|
info->tty = 0;
|
| 1473 |
|
|
if (info->blocked_open) {
|
| 1474 |
|
|
if (info->close_delay) {
|
| 1475 |
|
|
current->state = TASK_INTERRUPTIBLE;
|
| 1476 |
|
|
schedule_timeout(info->close_delay);
|
| 1477 |
|
|
}
|
| 1478 |
|
|
wake_up_interruptible(&info->open_wait);
|
| 1479 |
|
|
}
|
| 1480 |
|
|
info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE|
|
| 1481 |
|
|
ASYNC_CLOSING);
|
| 1482 |
|
|
wake_up_interruptible(&info->close_wait);
|
| 1483 |
|
|
restore_flags(flags);
|
| 1484 |
|
|
}
|
| 1485 |
|
|
|
| 1486 |
|
|
/*
|
| 1487 |
|
|
* rs_wait_until_sent() --- wait until the transmitter is empty
|
| 1488 |
|
|
*/
|
| 1489 |
|
|
static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
|
| 1490 |
|
|
{
|
| 1491 |
|
|
struct async_struct * info = (struct async_struct *)tty->driver_data;
|
| 1492 |
|
|
unsigned long orig_jiffies, char_time;
|
| 1493 |
|
|
int cisr;
|
| 1494 |
|
|
|
| 1495 |
|
|
if (serial_paranoia_check(info, tty->device, "rs_wait_until_sent"))
|
| 1496 |
|
|
return;
|
| 1497 |
|
|
|
| 1498 |
|
|
if (info->xmit_fifo_size == 0)
|
| 1499 |
|
|
return; /* Just in case.... */
|
| 1500 |
|
|
|
| 1501 |
|
|
orig_jiffies = jiffies;
|
| 1502 |
|
|
/*
|
| 1503 |
|
|
* Set the check interval to be 1/5 of the estimated time to
|
| 1504 |
|
|
* send a single character, and make it at least 1. The check
|
| 1505 |
|
|
* interval should also be less than the timeout.
|
| 1506 |
|
|
*
|
| 1507 |
|
|
* Note: we have to use pretty tight timings here to satisfy
|
| 1508 |
|
|
* the NIST-PCTS.
|
| 1509 |
|
|
*/
|
| 1510 |
|
|
char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
|
| 1511 |
|
|
char_time = char_time / 5;
|
| 1512 |
|
|
if (char_time == 0)
|
| 1513 |
|
|
char_time = 1;
|
| 1514 |
|
|
if (timeout)
|
| 1515 |
|
|
char_time = MIN(char_time, timeout);
|
| 1516 |
|
|
/*
|
| 1517 |
|
|
* If the transmitter hasn't cleared in twice the approximate
|
| 1518 |
|
|
* amount of time to send the entire FIFO, it probably won't
|
| 1519 |
|
|
* ever clear. This assumes the UART isn't doing flow
|
| 1520 |
|
|
* control, which is currently the case. Hence, if it ever
|
| 1521 |
|
|
* takes longer than info->timeout, this is probably due to a
|
| 1522 |
|
|
* UART bug of some kind. So, we clamp the timeout parameter at
|
| 1523 |
|
|
* 2*info->timeout.
|
| 1524 |
|
|
*/
|
| 1525 |
|
|
if (!timeout || timeout > 2*info->timeout)
|
| 1526 |
|
|
timeout = 2*info->timeout;
|
| 1527 |
|
|
#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
|
| 1528 |
|
|
printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
|
| 1529 |
|
|
printk("jiff=%lu...", jiffies);
|
| 1530 |
|
|
#endif
|
| 1531 |
|
|
while (!((cisr = sio_reg(info)->cisr) & TXx927_SICISR_TXALS)) {
|
| 1532 |
|
|
#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
|
| 1533 |
|
|
printk("cisr = %d (jiff=%lu)...", cisr, jiffies);
|
| 1534 |
|
|
#endif
|
| 1535 |
|
|
current->state = TASK_INTERRUPTIBLE;
|
| 1536 |
|
|
current->counter = 0; /* make us low-priority */
|
| 1537 |
|
|
schedule_timeout(char_time);
|
| 1538 |
|
|
if (signal_pending(current))
|
| 1539 |
|
|
break;
|
| 1540 |
|
|
if (timeout && time_after(jiffies, orig_jiffies + timeout))
|
| 1541 |
|
|
break;
|
| 1542 |
|
|
}
|
| 1543 |
|
|
current->state = TASK_RUNNING;
|
| 1544 |
|
|
#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
|
| 1545 |
|
|
printk("cisr = %d (jiff=%lu)...done\n", cisr, jiffies);
|
| 1546 |
|
|
#endif
|
| 1547 |
|
|
}
|
| 1548 |
|
|
|
| 1549 |
|
|
/*
|
| 1550 |
|
|
* rs_hangup() --- called by tty_hangup() when a hangup is signaled.
|
| 1551 |
|
|
*/
|
| 1552 |
|
|
static void rs_hangup(struct tty_struct *tty)
|
| 1553 |
|
|
{
|
| 1554 |
|
|
struct async_struct * info = (struct async_struct *)tty->driver_data;
|
| 1555 |
|
|
struct serial_state *state = info->state;
|
| 1556 |
|
|
|
| 1557 |
|
|
if (serial_paranoia_check(info, tty->device, "rs_hangup"))
|
| 1558 |
|
|
return;
|
| 1559 |
|
|
|
| 1560 |
|
|
state = info->state;
|
| 1561 |
|
|
|
| 1562 |
|
|
rs_flush_buffer(tty);
|
| 1563 |
|
|
shutdown(info);
|
| 1564 |
|
|
info->event = 0;
|
| 1565 |
|
|
state->count = 0;
|
| 1566 |
|
|
info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE);
|
| 1567 |
|
|
info->tty = 0;
|
| 1568 |
|
|
wake_up_interruptible(&info->open_wait);
|
| 1569 |
|
|
}
|
| 1570 |
|
|
|
| 1571 |
|
|
/*
|
| 1572 |
|
|
* ------------------------------------------------------------
|
| 1573 |
|
|
* rs_open() and friends
|
| 1574 |
|
|
* ------------------------------------------------------------
|
| 1575 |
|
|
*/
|
| 1576 |
|
|
static int block_til_ready(struct tty_struct *tty, struct file * filp,
|
| 1577 |
|
|
struct async_struct *info)
|
| 1578 |
|
|
{
|
| 1579 |
|
|
DECLARE_WAITQUEUE(wait, current);
|
| 1580 |
|
|
struct serial_state *state = info->state;
|
| 1581 |
|
|
int retval;
|
| 1582 |
|
|
int do_clocal = 0, extra_count = 0;
|
| 1583 |
|
|
unsigned long flags;
|
| 1584 |
|
|
|
| 1585 |
|
|
/*
|
| 1586 |
|
|
* If the device is in the middle of being closed, then block
|
| 1587 |
|
|
* until it's done, and then try again.
|
| 1588 |
|
|
*/
|
| 1589 |
|
|
if (tty_hung_up_p(filp) ||
|
| 1590 |
|
|
(info->flags & ASYNC_CLOSING)) {
|
| 1591 |
|
|
if (info->flags & ASYNC_CLOSING)
|
| 1592 |
|
|
interruptible_sleep_on(&info->close_wait);
|
| 1593 |
|
|
#ifdef SERIAL_DO_RESTART
|
| 1594 |
|
|
return ((info->flags & ASYNC_HUP_NOTIFY) ?
|
| 1595 |
|
|
-EAGAIN : -ERESTARTSYS);
|
| 1596 |
|
|
#else
|
| 1597 |
|
|
return -EAGAIN;
|
| 1598 |
|
|
#endif
|
| 1599 |
|
|
}
|
| 1600 |
|
|
|
| 1601 |
|
|
/*
|
| 1602 |
|
|
* If this is a callout device, then just make sure the normal
|
| 1603 |
|
|
* device isn't being used.
|
| 1604 |
|
|
*/
|
| 1605 |
|
|
if (tty->driver.subtype == SERIAL_TYPE_CALLOUT) {
|
| 1606 |
|
|
if (info->flags & ASYNC_NORMAL_ACTIVE)
|
| 1607 |
|
|
return -EBUSY;
|
| 1608 |
|
|
if ((info->flags & ASYNC_CALLOUT_ACTIVE) &&
|
| 1609 |
|
|
(info->flags & ASYNC_SESSION_LOCKOUT) &&
|
| 1610 |
|
|
(info->session != current->session))
|
| 1611 |
|
|
return -EBUSY;
|
| 1612 |
|
|
if ((info->flags & ASYNC_CALLOUT_ACTIVE) &&
|
| 1613 |
|
|
(info->flags & ASYNC_PGRP_LOCKOUT) &&
|
| 1614 |
|
|
(info->pgrp != current->pgrp))
|
| 1615 |
|
|
return -EBUSY;
|
| 1616 |
|
|
info->flags |= ASYNC_CALLOUT_ACTIVE;
|
| 1617 |
|
|
return 0;
|
| 1618 |
|
|
}
|
| 1619 |
|
|
|
| 1620 |
|
|
/*
|
| 1621 |
|
|
* If non-blocking mode is set, or the port is not enabled,
|
| 1622 |
|
|
* then make the check up front and then exit.
|
| 1623 |
|
|
*/
|
| 1624 |
|
|
if ((filp->f_flags & O_NONBLOCK) ||
|
| 1625 |
|
|
(tty->flags & (1 << TTY_IO_ERROR))) {
|
| 1626 |
|
|
if (info->flags & ASYNC_CALLOUT_ACTIVE)
|
| 1627 |
|
|
return -EBUSY;
|
| 1628 |
|
|
info->flags |= ASYNC_NORMAL_ACTIVE;
|
| 1629 |
|
|
return 0;
|
| 1630 |
|
|
}
|
| 1631 |
|
|
|
| 1632 |
|
|
if (info->flags & ASYNC_CALLOUT_ACTIVE) {
|
| 1633 |
|
|
if (state->normal_termios.c_cflag & CLOCAL)
|
| 1634 |
|
|
do_clocal = 1;
|
| 1635 |
|
|
} else {
|
| 1636 |
|
|
if (tty->termios->c_cflag & CLOCAL)
|
| 1637 |
|
|
do_clocal = 1;
|
| 1638 |
|
|
}
|
| 1639 |
|
|
|
| 1640 |
|
|
/*
|
| 1641 |
|
|
* Block waiting for the carrier detect and the line to become
|
| 1642 |
|
|
* free (i.e., not in use by the callout). While we are in
|
| 1643 |
|
|
* this loop, state->count is dropped by one, so that
|
| 1644 |
|
|
* rs_close() knows when to free things. We restore it upon
|
| 1645 |
|
|
* exit, either normal or abnormal.
|
| 1646 |
|
|
*/
|
| 1647 |
|
|
retval = 0;
|
| 1648 |
|
|
add_wait_queue(&info->open_wait, &wait);
|
| 1649 |
|
|
#ifdef SERIAL_DEBUG_OPEN
|
| 1650 |
|
|
printk("block_til_ready before block: ttys%d, count = %d\n",
|
| 1651 |
|
|
state->line, state->count);
|
| 1652 |
|
|
#endif
|
| 1653 |
|
|
save_flags(flags); cli();
|
| 1654 |
|
|
if (!tty_hung_up_p(filp)) {
|
| 1655 |
|
|
extra_count = 1;
|
| 1656 |
|
|
state->count--;
|
| 1657 |
|
|
}
|
| 1658 |
|
|
restore_flags(flags);
|
| 1659 |
|
|
info->blocked_open++;
|
| 1660 |
|
|
while (1) {
|
| 1661 |
|
|
save_flags(flags); cli();
|
| 1662 |
|
|
if (!(info->flags & ASYNC_CALLOUT_ACTIVE) &&
|
| 1663 |
|
|
(tty->termios->c_cflag & CBAUD))
|
| 1664 |
|
|
sio_reg(info)->flcr &= ~(TXx927_SIFLCR_RTSSC|TXx927_SIFLCR_RSDE);
|
| 1665 |
|
|
restore_flags(flags);
|
| 1666 |
|
|
current->state = TASK_INTERRUPTIBLE;
|
| 1667 |
|
|
if (tty_hung_up_p(filp) ||
|
| 1668 |
|
|
!(info->flags & ASYNC_INITIALIZED)) {
|
| 1669 |
|
|
#ifdef SERIAL_DO_RESTART
|
| 1670 |
|
|
if (info->flags & ASYNC_HUP_NOTIFY)
|
| 1671 |
|
|
retval = -EAGAIN;
|
| 1672 |
|
|
else
|
| 1673 |
|
|
retval = -ERESTARTSYS;
|
| 1674 |
|
|
#else
|
| 1675 |
|
|
retval = -EAGAIN;
|
| 1676 |
|
|
#endif
|
| 1677 |
|
|
break;
|
| 1678 |
|
|
}
|
| 1679 |
|
|
if (!(info->flags & ASYNC_CALLOUT_ACTIVE) &&
|
| 1680 |
|
|
!(info->flags & ASYNC_CLOSING))
|
| 1681 |
|
|
break;
|
| 1682 |
|
|
if (signal_pending(current)) {
|
| 1683 |
|
|
retval = -ERESTARTSYS;
|
| 1684 |
|
|
break;
|
| 1685 |
|
|
}
|
| 1686 |
|
|
#ifdef SERIAL_DEBUG_OPEN
|
| 1687 |
|
|
printk("block_til_ready blocking: ttys%d, count = %d\n",
|
| 1688 |
|
|
info->line, state->count);
|
| 1689 |
|
|
#endif
|
| 1690 |
|
|
schedule();
|
| 1691 |
|
|
}
|
| 1692 |
|
|
current->state = TASK_RUNNING;
|
| 1693 |
|
|
remove_wait_queue(&info->open_wait, &wait);
|
| 1694 |
|
|
if (extra_count)
|
| 1695 |
|
|
state->count++;
|
| 1696 |
|
|
info->blocked_open--;
|
| 1697 |
|
|
#ifdef SERIAL_DEBUG_OPEN
|
| 1698 |
|
|
printk("block_til_ready after blocking: ttys%d, count = %d\n",
|
| 1699 |
|
|
info->line, state->count);
|
| 1700 |
|
|
#endif
|
| 1701 |
|
|
if (retval)
|
| 1702 |
|
|
return retval;
|
| 1703 |
|
|
info->flags |= ASYNC_NORMAL_ACTIVE;
|
| 1704 |
|
|
return 0;
|
| 1705 |
|
|
}
|
| 1706 |
|
|
|
| 1707 |
|
|
static int get_async_struct(int line, struct async_struct **ret_info)
|
| 1708 |
|
|
{
|
| 1709 |
|
|
struct async_struct *info;
|
| 1710 |
|
|
struct serial_state *sstate;
|
| 1711 |
|
|
|
| 1712 |
|
|
#ifdef REMOTE_DEBUG
|
| 1713 |
|
|
if (kdb_port_info.state && line == kdb_port_info.line)
|
| 1714 |
|
|
return -ENODEV;
|
| 1715 |
|
|
#endif
|
| 1716 |
|
|
sstate = rs_table + line;
|
| 1717 |
|
|
sstate->count++;
|
| 1718 |
|
|
if (sstate->info) {
|
| 1719 |
|
|
*ret_info = sstate->info;
|
| 1720 |
|
|
return 0;
|
| 1721 |
|
|
}
|
| 1722 |
|
|
info = kmalloc(sizeof(struct async_struct), GFP_KERNEL);
|
| 1723 |
|
|
if (!info) {
|
| 1724 |
|
|
sstate->count--;
|
| 1725 |
|
|
return -ENOMEM;
|
| 1726 |
|
|
}
|
| 1727 |
|
|
memset(info, 0, sizeof(struct async_struct));
|
| 1728 |
|
|
init_waitqueue_head(&info->open_wait);
|
| 1729 |
|
|
init_waitqueue_head(&info->close_wait);
|
| 1730 |
|
|
init_waitqueue_head(&info->delta_msr_wait);
|
| 1731 |
|
|
info->magic = SERIAL_MAGIC;
|
| 1732 |
|
|
info->port = sstate->port;
|
| 1733 |
|
|
info->flags = sstate->flags;
|
| 1734 |
|
|
info->io_type = sstate->io_type;
|
| 1735 |
|
|
info->xmit_fifo_size = sstate->xmit_fifo_size;
|
| 1736 |
|
|
info->line = line;
|
| 1737 |
|
|
info->tqueue.routine = do_softint;
|
| 1738 |
|
|
info->tqueue.data = info;
|
| 1739 |
|
|
info->state = sstate;
|
| 1740 |
|
|
if (sstate->info) {
|
| 1741 |
|
|
kfree(info);
|
| 1742 |
|
|
*ret_info = sstate->info;
|
| 1743 |
|
|
return 0;
|
| 1744 |
|
|
}
|
| 1745 |
|
|
*ret_info = sstate->info = info;
|
| 1746 |
|
|
return 0;
|
| 1747 |
|
|
}
|
| 1748 |
|
|
|
| 1749 |
|
|
/*
|
| 1750 |
|
|
* This routine is called whenever a serial port is opened. It
|
| 1751 |
|
|
* enables interrupts for a serial port, linking in its async structure into
|
| 1752 |
|
|
* the IRQ chain. It also performs the serial-specific
|
| 1753 |
|
|
* initialization for the tty structure.
|
| 1754 |
|
|
*/
|
| 1755 |
|
|
static int rs_open(struct tty_struct *tty, struct file * filp)
|
| 1756 |
|
|
{
|
| 1757 |
|
|
struct async_struct *info;
|
| 1758 |
|
|
int retval, line;
|
| 1759 |
|
|
unsigned long page;
|
| 1760 |
|
|
|
| 1761 |
|
|
line = MINOR(tty->device) - tty->driver.minor_start;
|
| 1762 |
|
|
if ((line < 0) || (line >= NR_PORTS)) {
|
| 1763 |
|
|
return -ENODEV;
|
| 1764 |
|
|
}
|
| 1765 |
|
|
retval = get_async_struct(line, &info);
|
| 1766 |
|
|
if (retval) {
|
| 1767 |
|
|
return retval;
|
| 1768 |
|
|
}
|
| 1769 |
|
|
tty->driver_data = info;
|
| 1770 |
|
|
info->tty = tty;
|
| 1771 |
|
|
|
| 1772 |
|
|
#ifdef SERIAL_DEBUG_OPEN
|
| 1773 |
|
|
printk("rs_open %s%d, count = %d\n", tty->driver.name, info->line,
|
| 1774 |
|
|
info->state->count);
|
| 1775 |
|
|
#endif
|
| 1776 |
|
|
info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
|
| 1777 |
|
|
|
| 1778 |
|
|
if (!tmp_buf) {
|
| 1779 |
|
|
page = get_free_page(GFP_KERNEL);
|
| 1780 |
|
|
if (!page) {
|
| 1781 |
|
|
return -ENOMEM;
|
| 1782 |
|
|
}
|
| 1783 |
|
|
if (tmp_buf)
|
| 1784 |
|
|
free_page(page);
|
| 1785 |
|
|
else
|
| 1786 |
|
|
tmp_buf = (unsigned char *) page;
|
| 1787 |
|
|
}
|
| 1788 |
|
|
|
| 1789 |
|
|
/*
|
| 1790 |
|
|
* If the port is the middle of closing, bail out now
|
| 1791 |
|
|
*/
|
| 1792 |
|
|
if (tty_hung_up_p(filp) ||
|
| 1793 |
|
|
(info->flags & ASYNC_CLOSING)) {
|
| 1794 |
|
|
if (info->flags & ASYNC_CLOSING)
|
| 1795 |
|
|
interruptible_sleep_on(&info->close_wait);
|
| 1796 |
|
|
#ifdef SERIAL_DO_RESTART
|
| 1797 |
|
|
return ((info->flags & ASYNC_HUP_NOTIFY) ?
|
| 1798 |
|
|
-EAGAIN : -ERESTARTSYS);
|
| 1799 |
|
|
#else
|
| 1800 |
|
|
return -EAGAIN;
|
| 1801 |
|
|
#endif
|
| 1802 |
|
|
}
|
| 1803 |
|
|
|
| 1804 |
|
|
/*
|
| 1805 |
|
|
* Start up serial port
|
| 1806 |
|
|
*/
|
| 1807 |
|
|
retval = startup(info);
|
| 1808 |
|
|
if (retval) {
|
| 1809 |
|
|
return retval;
|
| 1810 |
|
|
}
|
| 1811 |
|
|
|
| 1812 |
|
|
retval = block_til_ready(tty, filp, info);
|
| 1813 |
|
|
if (retval) {
|
| 1814 |
|
|
#ifdef SERIAL_DEBUG_OPEN
|
| 1815 |
|
|
printk("rs_open returning after block_til_ready with %d\n",
|
| 1816 |
|
|
retval);
|
| 1817 |
|
|
#endif
|
| 1818 |
|
|
return retval;
|
| 1819 |
|
|
}
|
| 1820 |
|
|
|
| 1821 |
|
|
if ((info->state->count == 1) &&
|
| 1822 |
|
|
(info->flags & ASYNC_SPLIT_TERMIOS)) {
|
| 1823 |
|
|
if (tty->driver.subtype == SERIAL_TYPE_NORMAL)
|
| 1824 |
|
|
*tty->termios = info->state->normal_termios;
|
| 1825 |
|
|
else
|
| 1826 |
|
|
*tty->termios = info->state->callout_termios;
|
| 1827 |
|
|
change_speed(info, 0);
|
| 1828 |
|
|
}
|
| 1829 |
|
|
#ifdef CONFIG_TXX927_SERIAL_CONSOLE
|
| 1830 |
|
|
if (sercons.cflag && sercons.index == line) {
|
| 1831 |
|
|
tty->termios->c_cflag = sercons.cflag;
|
| 1832 |
|
|
sercons.cflag = 0;
|
| 1833 |
|
|
change_speed(info, 0);
|
| 1834 |
|
|
}
|
| 1835 |
|
|
#endif
|
| 1836 |
|
|
info->session = current->session;
|
| 1837 |
|
|
info->pgrp = current->pgrp;
|
| 1838 |
|
|
|
| 1839 |
|
|
#ifdef SERIAL_DEBUG_OPEN
|
| 1840 |
|
|
printk("rs_open ttys%d successful...", info->line);
|
| 1841 |
|
|
#endif
|
| 1842 |
|
|
return 0;
|
| 1843 |
|
|
}
|
| 1844 |
|
|
|
| 1845 |
|
|
/*
|
| 1846 |
|
|
* /proc fs routines....
|
| 1847 |
|
|
*/
|
| 1848 |
|
|
|
| 1849 |
|
|
static inline int line_info(char *buf, struct serial_state *state)
|
| 1850 |
|
|
{
|
| 1851 |
|
|
struct async_struct *info = state->info, scr_info;
|
| 1852 |
|
|
char stat_buf[30];
|
| 1853 |
|
|
int ret;
|
| 1854 |
|
|
unsigned long flags;
|
| 1855 |
|
|
|
| 1856 |
|
|
ret = sprintf(buf, "%d: uart:%s port:%lX irq:%d",
|
| 1857 |
|
|
state->line, SERIAL_DRIVER_NAME,
|
| 1858 |
|
|
state->port, state->irq);
|
| 1859 |
|
|
|
| 1860 |
|
|
if (!state->port) {
|
| 1861 |
|
|
ret += sprintf(buf+ret, "\n");
|
| 1862 |
|
|
return ret;
|
| 1863 |
|
|
}
|
| 1864 |
|
|
|
| 1865 |
|
|
/*
|
| 1866 |
|
|
* Figure out the current RS-232 lines
|
| 1867 |
|
|
*/
|
| 1868 |
|
|
if (!info) {
|
| 1869 |
|
|
info = &scr_info; /* This is just for serial_{in,out} */
|
| 1870 |
|
|
|
| 1871 |
|
|
info->magic = SERIAL_MAGIC;
|
| 1872 |
|
|
info->port = state->port;
|
| 1873 |
|
|
info->flags = state->flags;
|
| 1874 |
|
|
info->quot = 0;
|
| 1875 |
|
|
info->tty = 0;
|
| 1876 |
|
|
}
|
| 1877 |
|
|
|
| 1878 |
|
|
stat_buf[0] = 0;
|
| 1879 |
|
|
stat_buf[1] = 0;
|
| 1880 |
|
|
save_flags(flags); cli();
|
| 1881 |
|
|
if (!(sio_reg(info)->flcr & TXx927_SIFLCR_RTSSC))
|
| 1882 |
|
|
strcat(stat_buf, "|RTS");
|
| 1883 |
|
|
if (!(sio_reg(info)->cisr & TXx927_SICISR_CTSS))
|
| 1884 |
|
|
strcat(stat_buf, "|CTS");
|
| 1885 |
|
|
restore_flags(flags);
|
| 1886 |
|
|
|
| 1887 |
|
|
if (info->quot) {
|
| 1888 |
|
|
ret += sprintf(buf+ret, " baud:%d",
|
| 1889 |
|
|
state->baud_base / info->quot);
|
| 1890 |
|
|
}
|
| 1891 |
|
|
|
| 1892 |
|
|
ret += sprintf(buf+ret, " tx:%d rx:%d",
|
| 1893 |
|
|
state->icount.tx, state->icount.rx);
|
| 1894 |
|
|
|
| 1895 |
|
|
if (state->icount.frame)
|
| 1896 |
|
|
ret += sprintf(buf+ret, " fe:%d", state->icount.frame);
|
| 1897 |
|
|
|
| 1898 |
|
|
if (state->icount.parity)
|
| 1899 |
|
|
ret += sprintf(buf+ret, " pe:%d", state->icount.parity);
|
| 1900 |
|
|
|
| 1901 |
|
|
if (state->icount.brk)
|
| 1902 |
|
|
ret += sprintf(buf+ret, " brk:%d", state->icount.brk);
|
| 1903 |
|
|
|
| 1904 |
|
|
if (state->icount.overrun)
|
| 1905 |
|
|
ret += sprintf(buf+ret, " oe:%d", state->icount.overrun);
|
| 1906 |
|
|
|
| 1907 |
|
|
/*
|
| 1908 |
|
|
* Last thing is the RS-232 status lines
|
| 1909 |
|
|
*/
|
| 1910 |
|
|
ret += sprintf(buf+ret, " %s\n", stat_buf+1);
|
| 1911 |
|
|
return ret;
|
| 1912 |
|
|
}
|
| 1913 |
|
|
|
| 1914 |
|
|
static int rs_read_proc(char *page, char **start, off_t off, int count,
|
| 1915 |
|
|
int *eof, void *data)
|
| 1916 |
|
|
{
|
| 1917 |
|
|
int i, len = 0, l;
|
| 1918 |
|
|
off_t begin = 0;
|
| 1919 |
|
|
|
| 1920 |
|
|
len += sprintf(page, "serinfo:1.0 driver:%s\n", serial_version);
|
| 1921 |
|
|
for (i = 0; i < NR_PORTS && len < 4000; i++) {
|
| 1922 |
|
|
l = line_info(page + len, &rs_table[i]);
|
| 1923 |
|
|
len += l;
|
| 1924 |
|
|
if (len+begin > off+count)
|
| 1925 |
|
|
goto done;
|
| 1926 |
|
|
if (len+begin < off) {
|
| 1927 |
|
|
begin += len;
|
| 1928 |
|
|
len = 0;
|
| 1929 |
|
|
}
|
| 1930 |
|
|
}
|
| 1931 |
|
|
*eof = 1;
|
| 1932 |
|
|
done:
|
| 1933 |
|
|
if (off >= len+begin)
|
| 1934 |
|
|
return 0;
|
| 1935 |
|
|
*start = page + (begin-off);
|
| 1936 |
|
|
return ((count < begin+len-off) ? count : begin+len-off);
|
| 1937 |
|
|
}
|
| 1938 |
|
|
|
| 1939 |
|
|
/*
|
| 1940 |
|
|
* ---------------------------------------------------------------------
|
| 1941 |
|
|
* rs_init() and friends
|
| 1942 |
|
|
*
|
| 1943 |
|
|
* rs_init() is called at boot-time to initialize the serial driver.
|
| 1944 |
|
|
* ---------------------------------------------------------------------
|
| 1945 |
|
|
*/
|
| 1946 |
|
|
|
| 1947 |
|
|
/*
|
| 1948 |
|
|
* This routine prints out the appropriate serial driver version
|
| 1949 |
|
|
* number, and identifies which options were configured into this
|
| 1950 |
|
|
* driver.
|
| 1951 |
|
|
*/
|
| 1952 |
|
|
static _INLINE_ void show_serial_version(void)
|
| 1953 |
|
|
{
|
| 1954 |
|
|
printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
|
| 1955 |
|
|
}
|
| 1956 |
|
|
|
| 1957 |
|
|
/*
|
| 1958 |
|
|
* The serial driver boot-time initialization code!
|
| 1959 |
|
|
*/
|
| 1960 |
|
|
static int __init rs_init(void)
|
| 1961 |
|
|
{
|
| 1962 |
|
|
int i;
|
| 1963 |
|
|
struct serial_state * state;
|
| 1964 |
|
|
|
| 1965 |
|
|
if (rs_table[0].port == 0)
|
| 1966 |
|
|
return -ENODEV;
|
| 1967 |
|
|
|
| 1968 |
|
|
init_bh(TXX927_SERIAL_BH, do_serial_bh);
|
| 1969 |
|
|
init_timer(&serial_timer);
|
| 1970 |
|
|
serial_timer.function = rs_timer;
|
| 1971 |
|
|
mod_timer(&serial_timer, jiffies + RS_STROBE_TIME);
|
| 1972 |
|
|
|
| 1973 |
|
|
for (i = 0; i < NR_IRQS; i++) {
|
| 1974 |
|
|
IRQ_ports[i] = 0;
|
| 1975 |
|
|
IRQ_timeout[i] = 0;
|
| 1976 |
|
|
}
|
| 1977 |
|
|
#ifdef CONFIG_TXX927_SERIAL_CONSOLE
|
| 1978 |
|
|
/*
|
| 1979 |
|
|
* The interrupt of the serial console port
|
| 1980 |
|
|
* can't be shared.
|
| 1981 |
|
|
*/
|
| 1982 |
|
|
if (sercons.flags & CON_CONSDEV) {
|
| 1983 |
|
|
for(i = 0; i < NR_PORTS; i++)
|
| 1984 |
|
|
if (i != sercons.index &&
|
| 1985 |
|
|
rs_table[i].irq == rs_table[sercons.index].irq)
|
| 1986 |
|
|
rs_table[i].irq = 0;
|
| 1987 |
|
|
}
|
| 1988 |
|
|
#endif
|
| 1989 |
|
|
show_serial_version();
|
| 1990 |
|
|
|
| 1991 |
|
|
/* Initialize the tty_driver structure */
|
| 1992 |
|
|
|
| 1993 |
|
|
memset(&serial_driver, 0, sizeof(struct tty_driver));
|
| 1994 |
|
|
serial_driver.magic = TTY_DRIVER_MAGIC;
|
| 1995 |
|
|
serial_driver.driver_name = "txx927serial";
|
| 1996 |
|
|
#if (LINUX_VERSION_CODE > 0x2032D && defined(CONFIG_DEVFS_FS))
|
| 1997 |
|
|
serial_driver.name = "tts/%d";
|
| 1998 |
|
|
#else
|
| 1999 |
|
|
serial_driver.name = "ttyS";
|
| 2000 |
|
|
#endif
|
| 2001 |
|
|
serial_driver.major = TXX927_TTY_MAJOR;
|
| 2002 |
|
|
serial_driver.minor_start = TXX927_TTY_MINOR_START + SERIAL_DEV_OFFSET;
|
| 2003 |
|
|
serial_driver.num = NR_PORTS;
|
| 2004 |
|
|
serial_driver.type = TTY_DRIVER_TYPE_SERIAL;
|
| 2005 |
|
|
serial_driver.subtype = SERIAL_TYPE_NORMAL;
|
| 2006 |
|
|
serial_driver.init_termios = tty_std_termios;
|
| 2007 |
|
|
serial_driver.init_termios.c_cflag =
|
| 2008 |
|
|
B9600 | CS8 | CREAD | HUPCL | CLOCAL;
|
| 2009 |
|
|
serial_driver.flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_NO_DEVFS;
|
| 2010 |
|
|
serial_driver.refcount = &serial_refcount;
|
| 2011 |
|
|
serial_driver.table = serial_table;
|
| 2012 |
|
|
serial_driver.termios = serial_termios;
|
| 2013 |
|
|
serial_driver.termios_locked = serial_termios_locked;
|
| 2014 |
|
|
|
| 2015 |
|
|
serial_driver.open = rs_open;
|
| 2016 |
|
|
serial_driver.close = rs_close;
|
| 2017 |
|
|
serial_driver.write = rs_write;
|
| 2018 |
|
|
serial_driver.put_char = rs_put_char;
|
| 2019 |
|
|
serial_driver.flush_chars = rs_flush_chars;
|
| 2020 |
|
|
serial_driver.write_room = rs_write_room;
|
| 2021 |
|
|
serial_driver.chars_in_buffer = rs_chars_in_buffer;
|
| 2022 |
|
|
serial_driver.flush_buffer = rs_flush_buffer;
|
| 2023 |
|
|
serial_driver.ioctl = rs_ioctl;
|
| 2024 |
|
|
serial_driver.throttle = rs_throttle;
|
| 2025 |
|
|
serial_driver.unthrottle = rs_unthrottle;
|
| 2026 |
|
|
serial_driver.send_xchar = rs_send_xchar;
|
| 2027 |
|
|
serial_driver.set_termios = rs_set_termios;
|
| 2028 |
|
|
serial_driver.stop = rs_stop;
|
| 2029 |
|
|
serial_driver.start = rs_start;
|
| 2030 |
|
|
serial_driver.hangup = rs_hangup;
|
| 2031 |
|
|
serial_driver.break_ctl = rs_break;
|
| 2032 |
|
|
serial_driver.wait_until_sent = rs_wait_until_sent;
|
| 2033 |
|
|
serial_driver.read_proc = rs_read_proc;
|
| 2034 |
|
|
|
| 2035 |
|
|
/*
|
| 2036 |
|
|
* The callout device is just like normal device except for
|
| 2037 |
|
|
* major number and the subtype code.
|
| 2038 |
|
|
*/
|
| 2039 |
|
|
callout_driver = serial_driver;
|
| 2040 |
|
|
#if (LINUX_VERSION_CODE > 0x2032D && defined(CONFIG_DEVFS_FS))
|
| 2041 |
|
|
callout_driver.name = "cua/%d";
|
| 2042 |
|
|
#else
|
| 2043 |
|
|
callout_driver.name = "cua";
|
| 2044 |
|
|
#endif
|
| 2045 |
|
|
callout_driver.major = TTYAUX_MAJOR;
|
| 2046 |
|
|
callout_driver.subtype = SERIAL_TYPE_CALLOUT;
|
| 2047 |
|
|
callout_driver.read_proc = 0;
|
| 2048 |
|
|
callout_driver.proc_entry = 0;
|
| 2049 |
|
|
|
| 2050 |
|
|
if (tty_register_driver(&serial_driver)){
|
| 2051 |
|
|
panic("Couldn't register serial driver\n");
|
| 2052 |
|
|
}
|
| 2053 |
|
|
if (tty_register_driver(&callout_driver)) {
|
| 2054 |
|
|
panic("Couldn't register callout driver\n");
|
| 2055 |
|
|
}
|
| 2056 |
|
|
|
| 2057 |
|
|
for (i = 0, state = rs_table; i < NR_PORTS; i++,state++) {
|
| 2058 |
|
|
state->magic = SSTATE_MAGIC;
|
| 2059 |
|
|
state->line = i;
|
| 2060 |
|
|
state->type = PORT_UNKNOWN;
|
| 2061 |
|
|
state->custom_divisor = 0;
|
| 2062 |
|
|
state->close_delay = 5*HZ/10;
|
| 2063 |
|
|
state->closing_wait = 30*HZ;
|
| 2064 |
|
|
state->callout_termios = callout_driver.init_termios;
|
| 2065 |
|
|
state->normal_termios = serial_driver.init_termios;
|
| 2066 |
|
|
state->icount.cts = state->icount.dsr =
|
| 2067 |
|
|
state->icount.rng = state->icount.dcd = 0;
|
| 2068 |
|
|
state->icount.rx = state->icount.tx = 0;
|
| 2069 |
|
|
state->icount.frame = state->icount.parity = 0;
|
| 2070 |
|
|
state->icount.overrun = state->icount.brk = 0;
|
| 2071 |
|
|
state->irq = irq_cannonicalize(state->irq);
|
| 2072 |
|
|
state->xmit_fifo_size = TXx927_SIO_TX_FIFO;
|
| 2073 |
|
|
if (state->hub6)
|
| 2074 |
|
|
state->io_type = SERIAL_IO_HUB6;
|
| 2075 |
|
|
if (state->port) {
|
| 2076 |
|
|
continue;
|
| 2077 |
|
|
}
|
| 2078 |
|
|
}
|
| 2079 |
|
|
|
| 2080 |
|
|
for (i = 0, state = rs_table; i < NR_PORTS; i++,state++) {
|
| 2081 |
|
|
if (state->type == PORT_UNKNOWN) {
|
| 2082 |
|
|
continue;
|
| 2083 |
|
|
}
|
| 2084 |
|
|
printk(KERN_INFO "%s%02d at 0x%04lx (irq = %d) is a %s\n",
|
| 2085 |
|
|
TXX927_TTY_NAME,
|
| 2086 |
|
|
state->line,
|
| 2087 |
|
|
state->port, state->irq,
|
| 2088 |
|
|
SERIAL_DRIVER_NAME);
|
| 2089 |
|
|
tty_register_devfs(&serial_driver, 0,
|
| 2090 |
|
|
serial_driver.minor_start + state->line);
|
| 2091 |
|
|
tty_register_devfs(&callout_driver, 0,
|
| 2092 |
|
|
callout_driver.minor_start + state->line);
|
| 2093 |
|
|
}
|
| 2094 |
|
|
return 0;
|
| 2095 |
|
|
}
|
| 2096 |
|
|
|
| 2097 |
|
|
static void __exit rs_fini(void)
|
| 2098 |
|
|
{
|
| 2099 |
|
|
unsigned long flags;
|
| 2100 |
|
|
int e1, e2;
|
| 2101 |
|
|
int i;
|
| 2102 |
|
|
struct async_struct *info;
|
| 2103 |
|
|
|
| 2104 |
|
|
del_timer_sync(&serial_timer);
|
| 2105 |
|
|
save_flags(flags); cli();
|
| 2106 |
|
|
remove_bh(TXX927_SERIAL_BH);
|
| 2107 |
|
|
if ((e1 = tty_unregister_driver(&serial_driver)))
|
| 2108 |
|
|
printk(KERN_WARNING "serial: failed to unregister serial driver (%d)\n",
|
| 2109 |
|
|
e1);
|
| 2110 |
|
|
if ((e2 = tty_unregister_driver(&callout_driver)))
|
| 2111 |
|
|
printk(KERN_WARNING "serial: failed to unregister callout driver (%d)\n",
|
| 2112 |
|
|
e2);
|
| 2113 |
|
|
restore_flags(flags);
|
| 2114 |
|
|
|
| 2115 |
|
|
for (i = 0; i < NR_PORTS; i++) {
|
| 2116 |
|
|
if ((info = rs_table[i].info)) {
|
| 2117 |
|
|
rs_table[i].info = NULL;
|
| 2118 |
|
|
kfree(info);
|
| 2119 |
|
|
}
|
| 2120 |
|
|
}
|
| 2121 |
|
|
if (tmp_buf) {
|
| 2122 |
|
|
unsigned long pg = (unsigned long) tmp_buf;
|
| 2123 |
|
|
tmp_buf = NULL;
|
| 2124 |
|
|
free_page(pg);
|
| 2125 |
|
|
}
|
| 2126 |
|
|
}
|
| 2127 |
|
|
|
| 2128 |
|
|
module_init(rs_init);
|
| 2129 |
|
|
module_exit(rs_fini);
|
| 2130 |
|
|
MODULE_DESCRIPTION("TXX927 serial driver");
|
| 2131 |
|
|
|
| 2132 |
|
|
/*
|
| 2133 |
|
|
* ------------------------------------------------------------
|
| 2134 |
|
|
* Serial console driver
|
| 2135 |
|
|
* ------------------------------------------------------------
|
| 2136 |
|
|
*/
|
| 2137 |
|
|
#ifdef CONFIG_TXX927_SERIAL_CONSOLE
|
| 2138 |
|
|
|
| 2139 |
|
|
static struct async_struct async_sercons;
|
| 2140 |
|
|
|
| 2141 |
|
|
/*
|
| 2142 |
|
|
* Print a string to the serial port trying not to disturb
|
| 2143 |
|
|
* any possible real use of the port...
|
| 2144 |
|
|
*/
|
| 2145 |
|
|
static void serial_console_write(struct console *co, const char *s,
|
| 2146 |
|
|
unsigned count)
|
| 2147 |
|
|
{
|
| 2148 |
|
|
static struct async_struct *info = &async_sercons;
|
| 2149 |
|
|
int ier;
|
| 2150 |
|
|
unsigned i;
|
| 2151 |
|
|
|
| 2152 |
|
|
/*
|
| 2153 |
|
|
* First save the IER then disable the interrupts
|
| 2154 |
|
|
*/
|
| 2155 |
|
|
ier = sio_reg(info)->dicr;
|
| 2156 |
|
|
sio_reg(info)->dicr = 0;
|
| 2157 |
|
|
|
| 2158 |
|
|
|
| 2159 |
|
|
/*
|
| 2160 |
|
|
* Now, do each character
|
| 2161 |
|
|
*/
|
| 2162 |
|
|
for (i = 0; i < count; i++, s++) {
|
| 2163 |
|
|
wait_for_xmitr(info);
|
| 2164 |
|
|
|
| 2165 |
|
|
/*
|
| 2166 |
|
|
* Send the character out.
|
| 2167 |
|
|
* If a LF, also do CR...
|
| 2168 |
|
|
*/
|
| 2169 |
|
|
sio_reg(info)->tfifo = *s;
|
| 2170 |
|
|
if (*s == 10) {
|
| 2171 |
|
|
wait_for_xmitr(info);
|
| 2172 |
|
|
sio_reg(info)->tfifo = 13;
|
| 2173 |
|
|
}
|
| 2174 |
|
|
}
|
| 2175 |
|
|
|
| 2176 |
|
|
/*
|
| 2177 |
|
|
* Finally, Wait for transmitter & holding register to empty
|
| 2178 |
|
|
* and restore the IER
|
| 2179 |
|
|
*/
|
| 2180 |
|
|
wait_for_xmitr(info);
|
| 2181 |
|
|
sio_reg(info)->dicr = ier;
|
| 2182 |
|
|
}
|
| 2183 |
|
|
|
| 2184 |
|
|
static kdev_t serial_console_device(struct console *c)
|
| 2185 |
|
|
{
|
| 2186 |
|
|
return MKDEV(TXX927_TTY_MAJOR, TXX927_TTY_MINOR_START + c->index);
|
| 2187 |
|
|
}
|
| 2188 |
|
|
|
| 2189 |
|
|
/*
|
| 2190 |
|
|
* Setup initial baud/bits/parity. We do two things here:
|
| 2191 |
|
|
* - construct a cflag setting for the first rs_open()
|
| 2192 |
|
|
* - initialize the serial port
|
| 2193 |
|
|
* Return non-zero if we didn't find a serial port.
|
| 2194 |
|
|
*/
|
| 2195 |
|
|
static int serial_console_setup(struct console *co, char *options)
|
| 2196 |
|
|
{
|
| 2197 |
|
|
static struct async_struct *info;
|
| 2198 |
|
|
struct serial_state *state;
|
| 2199 |
|
|
unsigned cval;
|
| 2200 |
|
|
int baud = 9600;
|
| 2201 |
|
|
int bits = 8;
|
| 2202 |
|
|
int parity = 'n';
|
| 2203 |
|
|
int cflag = CREAD | HUPCL | CLOCAL;
|
| 2204 |
|
|
int quot = 0;
|
| 2205 |
|
|
char *s;
|
| 2206 |
|
|
|
| 2207 |
|
|
if (co->index < 0 || co->index >= NR_PORTS) {
|
| 2208 |
|
|
return -1;
|
| 2209 |
|
|
}
|
| 2210 |
|
|
if (options) {
|
| 2211 |
|
|
baud = simple_strtoul(options, NULL, 10);
|
| 2212 |
|
|
s = options;
|
| 2213 |
|
|
while(*s >= '0' && *s <= '9')
|
| 2214 |
|
|
s++;
|
| 2215 |
|
|
if (*s) parity = *s++;
|
| 2216 |
|
|
if (*s) bits = *s - '0';
|
| 2217 |
|
|
}
|
| 2218 |
|
|
|
| 2219 |
|
|
/*
|
| 2220 |
|
|
* Now construct a cflag setting.
|
| 2221 |
|
|
*/
|
| 2222 |
|
|
switch(baud) {
|
| 2223 |
|
|
case 1200:
|
| 2224 |
|
|
cflag |= B1200;
|
| 2225 |
|
|
break;
|
| 2226 |
|
|
case 2400:
|
| 2227 |
|
|
cflag |= B2400;
|
| 2228 |
|
|
break;
|
| 2229 |
|
|
case 4800:
|
| 2230 |
|
|
cflag |= B4800;
|
| 2231 |
|
|
break;
|
| 2232 |
|
|
case 19200:
|
| 2233 |
|
|
cflag |= B19200;
|
| 2234 |
|
|
break;
|
| 2235 |
|
|
case 38400:
|
| 2236 |
|
|
cflag |= B38400;
|
| 2237 |
|
|
break;
|
| 2238 |
|
|
case 57600:
|
| 2239 |
|
|
cflag |= B57600;
|
| 2240 |
|
|
break;
|
| 2241 |
|
|
case 115200:
|
| 2242 |
|
|
cflag |= B115200;
|
| 2243 |
|
|
break;
|
| 2244 |
|
|
case 9600:
|
| 2245 |
|
|
default:
|
| 2246 |
|
|
cflag |= B9600;
|
| 2247 |
|
|
break;
|
| 2248 |
|
|
}
|
| 2249 |
|
|
switch(bits) {
|
| 2250 |
|
|
case 7:
|
| 2251 |
|
|
cflag |= CS7;
|
| 2252 |
|
|
break;
|
| 2253 |
|
|
default:
|
| 2254 |
|
|
case 8:
|
| 2255 |
|
|
cflag |= CS8;
|
| 2256 |
|
|
break;
|
| 2257 |
|
|
}
|
| 2258 |
|
|
switch(parity) {
|
| 2259 |
|
|
case 'o': case 'O':
|
| 2260 |
|
|
cflag |= PARODD;
|
| 2261 |
|
|
break;
|
| 2262 |
|
|
case 'e': case 'E':
|
| 2263 |
|
|
cflag |= PARENB;
|
| 2264 |
|
|
break;
|
| 2265 |
|
|
}
|
| 2266 |
|
|
co->cflag = cflag;
|
| 2267 |
|
|
|
| 2268 |
|
|
/*
|
| 2269 |
|
|
* Divisor, bytesize and parity
|
| 2270 |
|
|
*/
|
| 2271 |
|
|
state = rs_table + co->index;
|
| 2272 |
|
|
info = &async_sercons;
|
| 2273 |
|
|
info->magic = SERIAL_MAGIC;
|
| 2274 |
|
|
info->state = state;
|
| 2275 |
|
|
info->port = state->port;
|
| 2276 |
|
|
info->flags = state->flags;
|
| 2277 |
|
|
info->io_type = state->io_type;
|
| 2278 |
|
|
info->iomem_base = state->iomem_base;
|
| 2279 |
|
|
info->iomem_reg_shift = state->iomem_reg_shift;
|
| 2280 |
|
|
quot = state->baud_base / baud;
|
| 2281 |
|
|
|
| 2282 |
|
|
switch (cflag & CSIZE) {
|
| 2283 |
|
|
case CS7: cval = TXx927_SILCR_UMODE_7BIT; break;
|
| 2284 |
|
|
default:
|
| 2285 |
|
|
case CS8: cval = TXx927_SILCR_UMODE_8BIT; break;
|
| 2286 |
|
|
}
|
| 2287 |
|
|
if (cflag & CSTOPB)
|
| 2288 |
|
|
cval |= TXx927_SILCR_USBL_2BIT;
|
| 2289 |
|
|
else
|
| 2290 |
|
|
cval |= TXx927_SILCR_USBL_1BIT;
|
| 2291 |
|
|
if (cflag & PARENB)
|
| 2292 |
|
|
cval |= TXx927_SILCR_UPEN;
|
| 2293 |
|
|
if (!(cflag & PARODD))
|
| 2294 |
|
|
cval |= TXx927_SILCR_UEPS;
|
| 2295 |
|
|
|
| 2296 |
|
|
/*
|
| 2297 |
|
|
* Disable UART interrupts, set DTR and RTS high
|
| 2298 |
|
|
* and set speed.
|
| 2299 |
|
|
*/
|
| 2300 |
|
|
sio_reg(info)->dicr = 0;
|
| 2301 |
|
|
sio_reg(info)->lcr = cval | TXx927_SILCR_SCS_IMCLK_BG;
|
| 2302 |
|
|
sio_reg(info)->bgr = quot | TXx927_SIBGR_BCLK_T0;
|
| 2303 |
|
|
/* HW RTS/CTS control */
|
| 2304 |
|
|
if (info->flags & ASYNC_HAVE_CTS_LINE)
|
| 2305 |
|
|
sio_reg(info)->flcr = TXx927_SIFLCR_RCS | TXx927_SIFLCR_TES |
|
| 2306 |
|
|
TXx927_SIFLCR_RTSTL_MAX /* 15 */;
|
| 2307 |
|
|
/* Enable RX/TX */
|
| 2308 |
|
|
sio_reg(info)->flcr &= ~(TXx927_SIFLCR_RSDE | TXx927_SIFLCR_TSDE);
|
| 2309 |
|
|
|
| 2310 |
|
|
return 0;
|
| 2311 |
|
|
}
|
| 2312 |
|
|
|
| 2313 |
|
|
static struct console sercons = {
|
| 2314 |
|
|
name: TXX927_TTY_NAME,
|
| 2315 |
|
|
write: serial_console_write,
|
| 2316 |
|
|
device: serial_console_device,
|
| 2317 |
|
|
setup: serial_console_setup,
|
| 2318 |
|
|
flags: CON_PRINTBUFFER,
|
| 2319 |
|
|
index: -1,
|
| 2320 |
|
|
};
|
| 2321 |
|
|
|
| 2322 |
|
|
/*
|
| 2323 |
|
|
* Register console.
|
| 2324 |
|
|
*/
|
| 2325 |
|
|
void __init txx927_console_init(void)
|
| 2326 |
|
|
{
|
| 2327 |
|
|
register_console(&sercons);
|
| 2328 |
|
|
}
|
| 2329 |
|
|
#endif
|
