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serial.c：源码内容

/*
* linux/drivers/char/serial.c
*
* 1998, 1999 Theodore Ts'o
*
* Extensively rewritten by Theodore Ts'o, 8/16/92 -- 9/14/92. Now
* much more extensible to support other serial cards based on the
* 16450/16550A UART's. Added support for the AST FourPort and the
* Accent Async board.
*
* set_serial_info fixed to set the flags, custom divisor, and uart
* type fields. Fix suggested by Michael K. Johnson 12/12/92.
*
* 11/95: TIOCMIWAIT, TIOCGICOUNT by Angelo Haritsis <ah@doc.ic.ac.uk>
*
* 03/96: Modularised by Angelo Haritsis <ah@doc.ic.ac.uk>
*
* rs_set_termios fixed to look also for changes of the input
* flags INPCK, BRKINT, PARMRK, IGNPAR and IGNBRK.
* Bernd Anh鋟pl 05/17/96.
*
* 1/97: Extended dumb serial ports are a config option now.
* Saves 4k. Michael A. Griffith <grif@acm.org>
*
* 8/97: Fix bug in rs_set_termios with RTS
* Stanislav V. Voronyi <stas@uanet.kharkov.ua>
*
* 3/98: Change the IRQ detection, use of probe_irq_o*(),
* suppress TIOCSERGWILD and TIOCSERSWILD
* Etienne Lorrain <etienne.lorrain@ibm.net>
*
* 4/98: Added changes to support the ARM architecture proposed by
* Russell King
*
* 5/99: Updated to include support for the XR16C850 and ST16C654
* uarts. Stuart MacDonald <stuartm@connecttech.com>
*
* 8/99: Generalized PCI support added. Theodore Ts'o
*
* 3/00: Rid circular buffer of redundant xmit_cnt. Fix a
* few races on freeing buffers too.
* Alan Modra <alan@linuxcare.com>
*
* 5/00: Support for the RSA-DV II/S card added.
* Kiyokazu SUTO <suto@ks-and-ks.ne.jp>
*
* 6/00: Remove old-style timer, use timer_list
* Andrew Morton <andrewm@uow.edu.au>
*
* 7/00: Support Timedia/Sunix/Exsys PCI cards
*
* 7/00: fix some returns on failure not using MOD_DEC_USE_COUNT.
* Arnaldo Carvalho de Melo <acme@conectiva.com.br>
*
* 10/00: add in optional software flow control for serial console.
* Kanoj Sarcar <kanoj@sgi.com> (Modified by Theodore Ts'o)
*
* 02/02: Fix for AMD Elan bug in transmit irq routine, by
* Christer Weinigel <wingel@hog.ctrl-c.liu.se>,
* Robert Schwebel <robert@schwebel.de>,
* Juergen Beisert <jbeisert@eurodsn.de>,
* Theodore Ts'o <tytso@mit.edu>
*/
static char *serial_version = "5.05c";
static char *serial_revdate = "2001-07-08";
/*
* Serial driver configuration section. Here are the various options:
*
* CONFIG_HUB6
* Enables support for the venerable Bell Technologies
* HUB6 card.
*
* CONFIG_SERIAL_MANY_PORTS
* Enables support for ports beyond the standard, stupid
* COM 1/2/3/4.
*
* CONFIG_SERIAL_MULTIPORT
* Enables support for special multiport board support.
*
* CONFIG_SERIAL_SHARE_IRQ
* Enables support for multiple serial ports on one IRQ
*
* CONFIG_SERIAL_DETECT_IRQ
* Enable the autodetection of IRQ on standart ports
*
* SERIAL_PARANOIA_CHECK
* Check the magic number for the async_structure where
* ever possible.
*
* CONFIG_SERIAL_ACPI
* Enable support for serial console port and serial
* debug port as defined by the SPCR and DBGP tables in
* ACPI 2.0.
*/
#include <linux/config.h>
#include <linux/version.h>
#undef SERIAL_PARANOIA_CHECK
#define CONFIG_SERIAL_NOPAUSE_IO
#define SERIAL_DO_RESTART
#if 0
/* These defines are normally controlled by the autoconf.h */
#define CONFIG_SERIAL_MANY_PORTS
#define CONFIG_SERIAL_SHARE_IRQ
#define CONFIG_SERIAL_DETECT_IRQ
#define CONFIG_SERIAL_MULTIPORT
#define CONFIG_HUB6
#endif
#ifdef CONFIG_PCI
#define ENABLE_SERIAL_PCI
#ifndef CONFIG_SERIAL_SHARE_IRQ
#define CONFIG_SERIAL_SHARE_IRQ
#endif
#ifndef CONFIG_SERIAL_MANY_PORTS
#define CONFIG_SERIAL_MANY_PORTS
#endif
#endif
#ifdef CONFIG_SERIAL_ACPI
#define ENABLE_SERIAL_ACPI
#endif
#if defined(CONFIG_ISAPNP)|| (defined(CONFIG_ISAPNP_MODULE) && defined(MODULE))
#ifndef ENABLE_SERIAL_PNP
#define ENABLE_SERIAL_PNP
#endif
#endif
/* Set of debugging defines */
#undef SERIAL_DEBUG_INTR
#undef SERIAL_DEBUG_OPEN
#undef SERIAL_DEBUG_FLOW
#undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
#undef SERIAL_DEBUG_PCI
#undef SERIAL_DEBUG_AUTOCONF
/* Sanity checks */
#ifdef CONFIG_SERIAL_MULTIPORT
#ifndef CONFIG_SERIAL_SHARE_IRQ
#define CONFIG_SERIAL_SHARE_IRQ
#endif
#endif
#ifdef CONFIG_HUB6
#ifndef CONFIG_SERIAL_MANY_PORTS
#define CONFIG_SERIAL_MANY_PORTS
#endif
#ifndef CONFIG_SERIAL_SHARE_IRQ
#define CONFIG_SERIAL_SHARE_IRQ
#endif
#endif
#ifdef MODULE
#undef CONFIG_SERIAL_CONSOLE
#endif
#define CONFIG_SERIAL_RSA
#define RS_STROBE_TIME (10*HZ)
#define RS_ISR_PASS_LIMIT 256
#if defined(__i386__) && (defined(CONFIG_M386) || defined(CONFIG_M486))
#define SERIAL_INLINE
#endif
/*
* End of serial driver configuration section.
*/
#include <linux/module.h>
#include <linux/types.h>
#ifdef LOCAL_HEADERS
#include "serial_local.h"
#else
#include <linux/serial.h>
#include <linux/serialP.h>
#include <linux/serial_reg.h>
#include <asm/serial.h>
#define LOCAL_VERSTRING ""
#endif
#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/major.h>
#include <linux/string.h>
#include <linux/fcntl.h>
#include <linux/ptrace.h>
#include <linux/ioport.h>
#include <linux/mm.h>
#include <linux/slab.h>
#if (LINUX_VERSION_CODE >= 131343)
#include <linux/init.h>
#endif
#if (LINUX_VERSION_CODE >= 131336)
#include <asm/uaccess.h>
#endif
#include <linux/delay.h>
#ifdef CONFIG_SERIAL_CONSOLE
#include <linux/console.h>
#endif
#ifdef ENABLE_SERIAL_PCI
#include <linux/pci.h>
#endif
#ifdef ENABLE_SERIAL_PNP
#include <linux/isapnp.h>
#endif
#ifdef CONFIG_MAGIC_SYSRQ
#include <linux/sysrq.h>
#endif
/*
* All of the compatibilty code so we can compile serial.c against
* older kernels is hidden in serial_compat.h
*/
#if defined(LOCAL_HEADERS) || (LINUX_VERSION_CODE < 0x020317) /* 2.3.23 */
#include "serial_compat.h"
#endif
#include <asm/system.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/bitops.h>
#if defined(CONFIG_MAC_SERIAL)
#define SERIAL_DEV_OFFSET ((_machine == _MACH_prep || _machine == _MACH_chrp) ? 0 : 2)
#else
#define SERIAL_DEV_OFFSET 0
#endif
#ifdef SERIAL_INLINE
#define _INLINE_ inline
#else
#define _INLINE_
#endif
static char *serial_name = "Serial driver";
static DECLARE_TASK_QUEUE(tq_serial);
static struct tty_driver serial_driver, callout_driver;
static int serial_refcount;
static struct timer_list serial_timer;
/* serial subtype definitions */
#ifndef SERIAL_TYPE_NORMAL
#define SERIAL_TYPE_NORMAL 1
#define SERIAL_TYPE_CALLOUT 2
#endif
/* number of characters left in xmit buffer before we ask for more */
#define WAKEUP_CHARS 256
/*
* IRQ_timeout - How long the timeout should be for each IRQ
* should be after the IRQ has been active.
*/
static struct async_struct *IRQ_ports[NR_IRQS];
#ifdef CONFIG_SERIAL_MULTIPORT
static struct rs_multiport_struct rs_multiport[NR_IRQS];
#endif
static int IRQ_timeout[NR_IRQS];
#ifdef CONFIG_SERIAL_CONSOLE
static struct console sercons;
static int lsr_break_flag;
#endif
#if defined(CONFIG_SERIAL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
static unsigned long break_pressed; /* break, really ... */
#endif
static unsigned detect_uart_irq (struct serial_state * state);
static void autoconfig(struct serial_state * state);
static void change_speed(struct async_struct *info, struct termios *old);
static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
/*
* Here we define the default xmit fifo size used for each type of
* UART
*/
static struct serial_uart_config uart_config[] = {
{ "unknown", 1, 0 },
{ "8250", 1, 0 },
{ "16450", 1, 0 },
{ "16550", 1, 0 },
{ "16550A", 16, UART_CLEAR_FIFO | UART_USE_FIFO },
{ "cirrus", 1, 0 }, /* usurped by cyclades.c */
{ "ST16650", 1, UART_CLEAR_FIFO | UART_STARTECH },
{ "ST16650V2", 32, UART_CLEAR_FIFO | UART_USE_FIFO |
UART_STARTECH },
{ "TI16750", 64, UART_CLEAR_FIFO | UART_USE_FIFO},
{ "Startech", 1, 0}, /* usurped by cyclades.c */
{ "16C950/954", 128, UART_CLEAR_FIFO | UART_USE_FIFO},
{ "ST16654", 64, UART_CLEAR_FIFO | UART_USE_FIFO |
UART_STARTECH },
{ "XR16850", 128, UART_CLEAR_FIFO | UART_USE_FIFO |
UART_STARTECH },
{ "RSA", 2048, UART_CLEAR_FIFO | UART_USE_FIFO },
{ 0, 0}
};
#if defined(CONFIG_SERIAL_RSA) && defined(MODULE)
#define PORT_RSA_MAX 4
static int probe_rsa[PORT_RSA_MAX];
static int force_rsa[PORT_RSA_MAX];
MODULE_PARM(probe_rsa, "1-" __MODULE_STRING(PORT_RSA_MAX) "i");
MODULE_PARM_DESC(probe_rsa, "Probe I/O ports for RSA");
MODULE_PARM(force_rsa, "1-" __MODULE_STRING(PORT_RSA_MAX) "i");
MODULE_PARM_DESC(force_rsa, "Force I/O ports for RSA");
#endif /* CONFIG_SERIAL_RSA */
struct serial_state rs_table[RS_TABLE_SIZE] = {
SERIAL_PORT_DFNS /* Defined in serial.h */
};
#define NR_PORTS (sizeof(rs_table)/sizeof(struct serial_state))
int serial_nr_ports = NR_PORTS;
#if (defined(ENABLE_SERIAL_PCI) || defined(ENABLE_SERIAL_PNP))
#define NR_PCI_BOARDS 8
static struct pci_board_inst serial_pci_board[NR_PCI_BOARDS];
#ifndef IS_PCI_REGION_IOPORT
#define IS_PCI_REGION_IOPORT(dev, r) (pci_resource_flags((dev), (r)) &
IORESOURCE_IO)
#endif
#ifndef IS_PCI_REGION_IOMEM
#define IS_PCI_REGION_IOMEM(dev, r) (pci_resource_flags((dev), (r)) &
IORESOURCE_MEM)
#endif
#ifndef PCI_IRQ_RESOURCE
#define PCI_IRQ_RESOURCE(dev, r) ((dev)->irq_resource[r].start)
#endif
#ifndef pci_get_subvendor
#define pci_get_subvendor(dev) ((dev)->subsystem_vendor)
#define pci_get_subdevice(dev) ((dev)->subsystem_device)
#endif
#endif /* ENABLE_SERIAL_PCI || ENABLE_SERIAL_PNP */
#ifndef PREPARE_FUNC
#define PREPARE_FUNC(dev) (dev->prepare)
#define ACTIVATE_FUNC(dev) (dev->activate)
#define DEACTIVATE_FUNC(dev) (dev->deactivate)
#endif
#define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8)
static struct tty_struct *serial_table[NR_PORTS];
static struct termios *serial_termios[NR_PORTS];
static struct termios *serial_termios_locked[NR_PORTS];
#if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
#define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %sn",
kdevname(tty->device), (info->flags), serial_refcount,info->count,tty->count,s)
#else
#define DBG_CNT(s)
#endif
/*
* tmp_buf is used as a temporary buffer by serial_write. We need to
* lock it in case the copy_from_user blocks while swapping in a page,
* and some other program tries to do a serial write at the same time.
* Since the lock will only come under contention when the system is
* swapping and available memory is low, it makes sense to share one
* buffer across all the serial ports, since it significantly saves
* memory if large numbers of serial ports are open.
*/
static unsigned char *tmp_buf;
#ifdef DECLARE_MUTEX
static DECLARE_MUTEX(tmp_buf_sem);
#else
static struct semaphore tmp_buf_sem = MUTEX;
#endif
static inline int serial_paranoia_check(struct async_struct *info,
kdev_t device, const char *routine)
{
#ifdef SERIAL_PARANOIA_CHECK
static const char *badmagic =
"Warning: bad magic number for serial struct (%s) in %sn";
static const char *badinfo =
"Warning: null async_struct for (%s) in %sn";
if (!info) {
printk(badinfo, kdevname(device), routine);
return 1;
}
if (info->magic != SERIAL_MAGIC) {
printk(badmagic, kdevname(device), routine);
return 1;
}
#endif
return 0;
}
static _INLINE_ unsigned int serial_in(struct async_struct *info, int offset)
{
switch (info->io_type) {
#ifdef CONFIG_HUB6
case SERIAL_IO_HUB6:
outb(info->hub6 - 1 + offset, info->port);
return inb(info->port+1);
#endif
case SERIAL_IO_MEM:
return readb((unsigned long) info->iomem_base +
(offset<<info->iomem_reg_shift));
default:
return inb(info->port + offset);
}
}
static _INLINE_ void serial_out(struct async_struct *info, int offset,
int value)
{
switch (info->io_type) {
#ifdef CONFIG_HUB6
case SERIAL_IO_HUB6:
outb(info->hub6 - 1 + offset, info->port);
outb(value, info->port+1);
break;
#endif
case SERIAL_IO_MEM:
writeb(value, (unsigned long) info->iomem_base +
(offset<<info->iomem_reg_shift));
break;
default:
outb(value, info->port+offset);
}
}
/*
* We used to support using pause I/O for certain machines. We
* haven't supported this for a while, but just in case it's badly
* needed for certain old 386 machines, I've left these #define's
* in....
*/
#define serial_inp(info, offset) serial_in(info, offset)
#define serial_outp(info, offset, value) serial_out(info, offset, value)
/*
* For the 16C950
*/
void serial_icr_write(struct async_struct *info, int offset, int value)
{
serial_out(info, UART_SCR, offset);
serial_out(info, UART_ICR, value);
}
unsigned int serial_icr_read(struct async_struct *info, int offset)
{
int value;
serial_icr_write(info, UART_ACR, info->ACR | UART_ACR_ICRRD);
serial_out(info, UART_SCR, offset);
value = serial_in(info, UART_ICR);
serial_icr_write(info, UART_ACR, info->ACR);
return value;
}
/*
* ------------------------------------------------------------
* rs_stop() and rs_start()
*
* This routines are called before setting or resetting tty->stopped.
* They enable or disable transmitter interrupts, as necessary.
* ------------------------------------------------------------
*/
static void rs_stop(struct tty_struct *tty)
{
struct async_struct *info = (struct async_struct *)tty->driver_data;
unsigned long flags;
if (serial_paranoia_check(info, tty->device, "rs_stop"))
return;
save_flags(flags); cli();
if (info->IER & UART_IER_THRI) {
info->IER &= ~UART_IER_THRI;
serial_out(info, UART_IER, info->IER);
}
if (info->state->type == PORT_16C950) {
info->ACR |= UART_ACR_TXDIS;
serial_icr_write(info, UART_ACR, info->ACR);
}
restore_flags(flags);
}
static void rs_start(struct tty_struct *tty)
{
struct async_struct *info = (struct async_struct *)tty->driver_data;
unsigned long flags;
if (serial_paranoia_check(info, tty->device, "rs_start"))
return;
save_flags(flags); cli();
if (info->xmit.head != info->xmit.tail
&& info->xmit.buf
&& !(info->IER & UART_IER_THRI)) {
info->IER |= UART_IER_THRI;
serial_out(info, UART_IER, info->IER);
}
if (info->state->type == PORT_16C950) {
info->ACR &= ~UART_ACR_TXDIS;
serial_icr_write(info, UART_ACR, info->ACR);
}
restore_flags(flags);
}
/*
* ----------------------------------------------------------------------
*
* Here starts the interrupt handling routines. All of the following
* subroutines are declared as inline and are folded into
* rs_interrupt(). They were separated out for readability's sake.
*
* Note: rs_interrupt() is a "fast" interrupt, which means that it
* runs with interrupts turned off. People who may want to modify
* rs_interrupt() should try to keep the interrupt handler as fast as
* possible. After you are done making modifications, it is not a bad
* idea to do:
*
* gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
*
* and look at the resulting assemble code in serial.s.
*
* - Ted Ts'o (tytso@mit.edu), 7-Mar-93
* -----------------------------------------------------------------------
*/
/*
* This routine is used by the interrupt handler to schedule
* processing in the software interrupt portion of the driver.
*/
static _INLINE_ void rs_sched_event(struct async_struct *info,
int event)
{
info->event |= 1 << event;
queue_task(&info->tqueue, &tq_serial);
mark_bh(SERIAL_BH);
}
static _INLINE_ void receive_chars(struct async_struct *info,
int *status, struct pt_regs * regs)
{
struct tty_struct *tty = info->tty;
unsigned char ch;
struct async_icount *icount;
int max_count = 256;
icount = &info->state->icount;
do {
if (tty->flip.count >= TTY_FLIPBUF_SIZE) {
tty->flip.tqueue.routine((void *) tty);
if (tty->flip.count >= TTY_FLIPBUF_SIZE)
return; // if TTY_DONT_FLIP is set
}
ch = serial_inp(info, UART_RX);
*tty->flip.char_buf_ptr = ch;
icount->rx++;
#ifdef SERIAL_DEBUG_INTR
printk("DR%02x:%02x...", ch, *status);
#endif
*tty->flip.flag_buf_ptr = 0;
if (*status & (UART_LSR_BI | UART_LSR_PE |
UART_LSR_FE | UART_LSR_OE)) {
/*
* For statistics only
*/
if (*status & UART_LSR_BI) {
*status &= ~(UART_LSR_FE | UART_LSR_PE);
icount->brk++;
/*
* We do the SysRQ and SAK checking
* here because otherwise the break
* may get masked by ignore_status_mask
* or read_status_mask.
*/
#if defined(CONFIG_SERIAL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
if (info->line == sercons.index) {
if (!break_pressed) {
break_pressed = jiffies;
goto ignore_char;
}
break_pressed = 0;
}
#endif
if (info->flags & ASYNC_SAK)
do_SAK(tty);
} else if (*status & UART_LSR_PE)
icount->parity++;
else if (*status & UART_LSR_FE)
icount->frame++;
if (*status & UART_LSR_OE)
icount->overrun++;
/*
* Mask off conditions which should be ignored.
*/
*status &= info->read_status_mask;
#ifdef CONFIG_SERIAL_CONSOLE
if (info->line == sercons.index) {
/* Recover the break flag from console xmit */
*status |= lsr_break_flag;
lsr_break_flag = 0;
}
#endif
if (*status & (UART_LSR_BI)) {
#ifdef SERIAL_DEBUG_INTR
printk("handling break....");
#endif
*tty->flip.flag_buf_ptr = TTY_BREAK;
} else if (*status & UART_LSR_PE)
*tty->flip.flag_buf_ptr = TTY_PARITY;
else if (*status & UART_LSR_FE)
*tty->flip.flag_buf_ptr = TTY_FRAME;
}
#if defined(CONFIG_SERIAL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
if (break_pressed && info->line == sercons.index) {
if (ch != 0 &&
time_before(jiffies, break_pressed + HZ*5)) {
handle_sysrq(ch, regs, NULL, NULL);
break_pressed = 0;
goto ignore_char;
}
break_pressed = 0;
}
#endif
if ((*status & info->ignore_status_mask) == 0) {
tty->flip.flag_buf_ptr++;
tty->flip.char_buf_ptr++;
tty->flip.count++;
}
if ((*status & UART_LSR_OE) &&
(tty->flip.count < TTY_FLIPBUF_SIZE)) {
/*
* Overrun is special, since it's reported
* immediately, and doesn't affect the current
* character
*/
*tty->flip.flag_buf_ptr = TTY_OVERRUN;
tty->flip.count++;
tty->flip.flag_buf_ptr++;
tty->flip.char_buf_ptr++;
}
#if defined(CONFIG_SERIAL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
ignore_char:
#endif
*status = serial_inp(info, UART_LSR);
} while ((*status & UART_LSR_DR) && (max_count-- > 0));
#if (LINUX_VERSION_CODE > 131394) /* 2.1.66 */
tty_flip_buffer_push(tty);
#else
queue_task_irq_off(&tty->flip.tqueue, &tq_timer);
#endif
}
static _INLINE_ void transmit_chars(struct async_struct *info, int *intr_done)
{
int count;
if (info->x_char) {
serial_outp(info, UART_TX, info->x_char);
info->state->icount.tx++;
info->x_char = 0;
if (intr_done)
*intr_done = 0;
return;
}
if (info->xmit.head == info->xmit.tail
|| info->tty->stopped
|| info->tty->hw_stopped) {
info->IER &= ~UART_IER_THRI;
serial_out(info, UART_IER, info->IER);
return;
}
count = info->xmit_fifo_size;
do {
serial_out(info, UART_TX, info->xmit.buf[info->xmit.tail]);
info->xmit.tail = (info->xmit.tail + 1) & (SERIAL_XMIT_SIZE-1);
info->state->icount.tx++;
if (info->xmit.head == info->xmit.tail)
break;
} while (--count > 0);
if (CIRC_CNT(info->xmit.head,
info->xmit.tail,
SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
#ifdef SERIAL_DEBUG_INTR
printk("THRE...");
#endif
if (intr_done)
*intr_done = 0;
if (info->xmit.head == info->xmit.tail) {
info->IER &= ~UART_IER_THRI;
serial_out(info, UART_IER, info->IER);
}
}
static _INLINE_ void check_modem_status(struct async_struct *info)
{
int status;
struct async_icount *icount;
status = serial_in(info, UART_MSR);
if (status & UART_MSR_ANY_DELTA) {
icount = &info->state->icount;
/* update input line counters */
if (status & UART_MSR_TERI)
icount->rng++;
if (status & UART_MSR_DDSR)
icount->dsr++;
if (status & UART_MSR_DDCD) {
icount->dcd++;
#ifdef CONFIG_HARD_PPS
if ((info->flags & ASYNC_HARDPPS_CD) &&
(status & UART_MSR_DCD))
hardpps();
#endif
}
if (status & UART_MSR_DCTS)
icount->cts++;
wake_up_interruptible(&info->delta_msr_wait);
}
if ((info->flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) {
#if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
printk("ttys%d CD now %s...", info->line,
(status & UART_MSR_DCD) ? "on" : "off");
#endif
if (status & UART_MSR_DCD)
wake_up_interruptible(&info->open_wait);
else if (!((info->flags & ASYNC_CALLOUT_ACTIVE) &&
(info->flags & ASYNC_CALLOUT_NOHUP))) {
#ifdef SERIAL_DEBUG_OPEN
printk("doing serial hangup...");
#endif
if (info->tty)
tty_hangup(info->tty);
}
}
if (info->flags & ASYNC_CTS_FLOW) {
if (info->tty->hw_stopped) {
if (status & UART_MSR_CTS) {
#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
printk("CTS tx start...");
#endif
info->tty->hw_stopped = 0;
info->IER |= UART_IER_THRI;
serial_out(info, UART_IER, info->IER);
rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
return;
}
} else {
if (!(status & UART_MSR_CTS)) {
#if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
printk("CTS tx stop...");
#endif
info->tty->hw_stopped = 1;
info->IER &= ~UART_IER_THRI;
serial_out(info, UART_IER, info->IER);
}
}
}
}
#ifdef CONFIG_SERIAL_SHARE_IRQ
/*
* This is the serial driver's generic interrupt routine
*/
static void rs_interrupt(int irq, void *dev_id, struct pt_regs * regs)
{
int status, iir;
struct async_struct * info;
int pass_counter = 0;
struct async_struct *end_mark = 0;
#ifdef CONFIG_SERIAL_MULTIPORT
int first_multi = 0;
struct rs_multiport_struct *multi;
#endif
#ifdef SERIAL_DEBUG_INTR
printk("rs_interrupt(%d)...", irq);
#endif
info = IRQ_ports[irq];
if (!info)
return;
#ifdef CONFIG_SERIAL_MULTIPORT
multi = &rs_multiport[irq];
if (multi->port_monitor)
first_multi = inb(multi->port_monitor);
#endif
do {
if (!info->tty ||
((iir=serial_in(info, UART_IIR)) & UART_IIR_NO_INT)) {
if (!end_mark)
end_mark = info;
goto next;
}
#ifdef SERIAL_DEBUG_INTR
printk("IIR = %x...", serial_in(info, UART_IIR));
#endif
end_mark = 0;
info->last_active = jiffies;
status = serial_inp(info, UART_LSR);
#ifdef SERIAL_DEBUG_INTR
printk("status = %x...", status);
#endif
if (status & UART_LSR_DR)
receive_chars(info, &status, regs);
check_modem_status(info);
if ((status & UART_LSR_THRE) ||
/* for buggy ELAN processors */
((iir & UART_IIR_ID) == UART_IIR_THRI))
transmit_chars(info, 0);
next:
info = info->next_port;
if (!info) {
info = IRQ_ports[irq];
if (pass_counter++ > RS_ISR_PASS_LIMIT) {
#if 0
printk("rs loop breakn");
#endif
break; /* Prevent infinite loops */
}
continue;
}
} while (end_mark != info);
#ifdef CONFIG_SERIAL_MULTIPORT
if (multi->port_monitor)
printk("rs port monitor (normal) irq %d: 0x%x, 0x%xn",
info->state->irq, first_multi,
inb(multi->port_monitor));
#endif
#ifdef SERIAL_DEBUG_INTR
printk("end.n");
#endif
}
#endif /* #ifdef CONFIG_SERIAL_SHARE_IRQ */
/*
* This is the serial driver's interrupt routine for a single port
*/
static void rs_interrupt_single(int irq, void *dev_id, struct pt_regs * regs)
{
int status, iir;
int pass_counter = 0;
struct async_struct * info;
#ifdef CONFIG_SERIAL_MULTIPORT
int first_multi = 0;
struct rs_multiport_struct *multi;
#endif
#ifdef SERIAL_DEBUG_INTR
printk("rs_interrupt_single(%d)...", irq);
#endif
info = IRQ_ports[irq];
if (!info || !info->tty)
return;
#ifdef CONFIG_SERIAL_MULTIPORT
multi = &rs_multiport[irq];
if (multi->port_monitor)
first_multi = inb(multi->port_monitor);
#endif
iir = serial_in(info, UART_IIR);
do {
status = serial_inp(info, UART_LSR);
#ifdef SERIAL_DEBUG_INTR
printk("status = %x...", status);
#endif
if (status & UART_LSR_DR)
receive_chars(info, &status, regs);
check_modem_status(info);
if ((status & UART_LSR_THRE) ||
/* For buggy ELAN processors */
((iir & UART_IIR_ID) == UART_IIR_THRI))
transmit_chars(info, 0);
if (pass_counter++ > RS_ISR_PASS_LIMIT) {
#if SERIAL_DEBUG_INTR
printk("rs_single loop break.n");
#endif
break;
}
iir = serial_in(info, UART_IIR);
#ifdef SERIAL_DEBUG_INTR
printk("IIR = %x...", iir);
#endif
} while ((iir & UART_IIR_NO_INT) == 0);
info->last_active = jiffies;
#ifdef CONFIG_SERIAL_MULTIPORT
if (multi->port_monitor)
printk("rs port monitor (single) irq %d: 0x%x, 0x%xn",
info->state->irq, first_multi,
inb(multi->port_monitor));
#endif
#ifdef SERIAL_DEBUG_INTR
printk("end.n");
#endif
}
#ifdef CONFIG_SERIAL_MULTIPORT
/*
* This is the serial driver's for multiport boards
*/
static void rs_interrupt_multi(int irq, void *dev_id, struct pt_regs * regs)
{
int status;
struct async_struct * info;
int pass_counter = 0;
int first_multi= 0;
struct rs_multiport_struct *multi;
#ifdef SERIAL_DEBUG_INTR
printk("rs_interrupt_multi(%d)...", irq);
#endif
info = IRQ_ports[irq];
if (!info)
return;
multi = &rs_multiport[irq];
if (!multi->port1) {
/* Should never happen */
printk("rs_interrupt_multi: NULL port1!n");
return;
}
if (multi->port_monitor)
first_multi = inb(multi->port_monitor);
while (1) {
if (!info->tty ||
(serial_in(info, UART_IIR) & UART_IIR_NO_INT))
goto next;
info->last_active = jiffies;
status = serial_inp(info, UART_LSR);
#ifdef SERIAL_DEBUG_INTR
printk("status = %x...", status);
#endif
if (status & UART_LSR_DR)
receive_chars(info, &status, regs);
check_modem_status(info);
if (status & UART_LSR_THRE)
transmit_chars(info, 0);
next:
info = info->next_port;
if (info)
continue;
info = IRQ_ports[irq];
/*
* The user was a bonehead, and misconfigured their
* multiport info. Rather than lock up the kernel
* in an infinite loop, if we loop too many times,
* print a message and break out of the loop.
*/
if (pass_counter++ > RS_ISR_PASS_LIMIT) {
printk("Misconfigured multiport serial info "
"for irq %d. Breaking out irq loopn", irq);
break;
}
if (multi->port_monitor)
printk("rs port monitor irq %d: 0x%x, 0x%xn",
info->state->irq, first_multi,
inb(multi->port_monitor));
if ((inb(multi->port1) & multi->mask1) != multi->match1)
continue;
if (!multi->port2)
break;
if ((inb(multi->port2) & multi->mask2) != multi->match2)
continue;
if (!multi->port3)
break;
if ((inb(multi->port3) & multi->mask3) != multi->match3)
continue;
if (!multi->port4)
break;
if ((inb(multi->port4) & multi->mask4) != multi->match4)
continue;
break;
}
#ifdef SERIAL_DEBUG_INTR
printk("end.n");
#endif
}
#endif
/*
* -------------------------------------------------------------------
* Here ends the serial interrupt routines.
* -------------------------------------------------------------------
*/
/*
* This routine is used to handle the "bottom half" processing for the
* serial driver, known also the "software interrupt" processing.
* This processing is done at the kernel interrupt level, after the
* rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON. This
* is where time-consuming activities which can not be done in the
* interrupt driver proper are done; the interrupt driver schedules
* them using rs_sched_event(), and they get done here.
*/
static void do_serial_bh(void)
{
run_task_queue(&tq_serial);
}
static void do_softint(void *private_)
{
struct async_struct *info = (struct async_struct *) private_;
struct tty_struct *tty;
tty = info->tty;
if (!tty)
return;
if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) {
if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
tty->ldisc.write_wakeup)
(tty->ldisc.write_wakeup)(tty);
wake_up_interruptible(&tty->write_wait);
#ifdef SERIAL_HAVE_POLL_WAIT
wake_up_interruptible(&tty->poll_wait);
#endif
}
}
/*
* This subroutine is called when the RS_TIMER goes off. It is used
* by the serial driver to handle ports that do not have an interrupt
* (irq=0). This doesn't work very well for 16450's, but gives barely
* passable results for a 16550A. (Although at the expense of much
* CPU overhead).
*/
static void rs_timer(unsigned long dummy)
{
static unsigned long last_strobe;
struct async_struct *info;
unsigned int i;
unsigned long flags;
if ((jiffies - last_strobe) >= RS_STROBE_TIME) {
for (i=0; i < NR_IRQS; i++) {
info = IRQ_ports[i];
if (!info)
continue;
save_flags(flags); cli();
#ifdef CONFIG_SERIAL_SHARE_IRQ
if (info->next_port) {
do {
serial_out(info, UART_IER, 0);
info->IER |= UART_IER_THRI;
serial_out(info, UART_IER, info->IER);
info = info->next_port;
} while (info);
#ifdef CONFIG_SERIAL_MULTIPORT
if (rs_multiport[i].port1)
rs_interrupt_multi(i, NULL, NULL);
else
#endif
rs_interrupt(i, NULL, NULL);
} else
#endif /* CONFIG_SERIAL_SHARE_IRQ */
rs_interrupt_single(i, NULL, NULL);
restore_flags(flags);
}
}
last_strobe = jiffies;
mod_timer(&serial_timer, jiffies + RS_STROBE_TIME);
if (IRQ_ports[0]) {
save_flags(flags); cli();
#ifdef CONFIG_SERIAL_SHARE_IRQ
rs_interrupt(0, NULL, NULL);
#else
rs_interrupt_single(0, NULL, NULL);
#endif
restore_flags(flags);
mod_timer(&serial_timer, jiffies + IRQ_timeout[0]);
}
}
/*
* ---------------------------------------------------------------
* Low level utility subroutines for the serial driver: routines to
* figure out the appropriate timeout for an interrupt chain, routines
* to initialize and startup a serial port, and routines to shutdown a
* serial port. Useful stuff like that.
* ---------------------------------------------------------------
*/
/*
* This routine figures out the correct timeout for a particular IRQ.
* It uses the smallest timeout of all of the serial ports in a
* particular interrupt chain. Now only used for IRQ 0....
*/
static void figure_IRQ_timeout(int irq)
{
struct async_struct *info;
int timeout = 60*HZ; /* 60 seconds === a long time :-) */
info = IRQ_ports[irq];
if (!info) {
IRQ_timeout[irq] = 60*HZ;
return;
}
while (info) {
if (info->timeout < timeout)
timeout = info->timeout;
info = info->next_port;
}
if (!irq)
timeout = timeout / 2;
IRQ_timeout[irq] = (timeout > 3) ? timeout-2 : 1;
}
#ifdef CONFIG_SERIAL_RSA
/* Attempts to turn on the RSA FIFO. Returns zero on failure */
static int enable_rsa(struct async_struct *info)
{
unsigned char mode;
int result;
unsigned long flags;
save_flags(flags); cli();
mode = serial_inp(info, UART_RSA_MSR);
result = mode & UART_RSA_MSR_FIFO;
if (!result) {
serial_outp(info, UART_RSA_MSR, mode | UART_RSA_MSR_FIFO);
mode = serial_inp(info, UART_RSA_MSR);
result = mode & UART_RSA_MSR_FIFO;
}
restore_flags(flags);
return result;
}
/* Attempts to turn off the RSA FIFO. Returns zero on failure */
static int disable_rsa(struct async_struct *info)
{
unsigned char mode;
int result;
unsigned long flags;
save_flags(flags); cli();
mode = serial_inp(info, UART_RSA_MSR);
result = !(mode & UART_RSA_MSR_FIFO);
if (!result) {
serial_outp(info, UART_RSA_MSR, mode & ~UART_RSA_MSR_FIFO);
mode = serial_inp(info, UART_RSA_MSR);
result = !(mode & UART_RSA_MSR_FIFO);
}
restore_flags(flags);
return result;
}
#endif /* CONFIG_SERIAL_RSA */
static int startup(struct async_struct * info)
{
unsigned long flags;
int retval=0;
void (*handler)(int, void *, struct pt_regs *);
struct serial_state *state= info->state;
unsigned long page;
#ifdef CONFIG_SERIAL_MANY_PORTS
unsigned short ICP;
#endif
page = get_zeroed_page(GFP_KERNEL);
if (!page)
return -ENOMEM;
save_flags(flags); cli();
if (info->flags & ASYNC_INITIALIZED) {
free_page(page);
goto errout;
}
if (!CONFIGURED_SERIAL_PORT(state) || !state->type) {
if (info->tty)
set_bit(TTY_IO_ERROR, &info->tty->flags);
free_page(page);
goto errout;
}
if (info->xmit.buf)
free_page(page);
else
info->xmit.buf = (unsigned char *) page;
#ifdef SERIAL_DEBUG_OPEN
printk("starting up ttys%d (irq %d)...", info->line, state->irq);
#endif
if (uart_config[state->type].flags & UART_STARTECH) {
/* Wake up UART */
serial_outp(info, UART_LCR, 0xBF);
serial_outp(info, UART_EFR, UART_EFR_ECB);
/*
* Turn off LCR == 0xBF so we actually set the IER
* register on the XR16C850
*/
serial_outp(info, UART_LCR, 0);
serial_outp(info, UART_IER, 0);
/*
* Now reset LCR so we can turn off the ECB bit
*/
serial_outp(info, UART_LCR, 0xBF);
serial_outp(info, UART_EFR, 0);
/*
* For a XR16C850, we need to set the trigger levels
*/
if (state->type == PORT_16850) {
serial_outp(info, UART_FCTR, UART_FCTR_TRGD |
UART_FCTR_RX);
serial_outp(info, UART_TRG, UART_TRG_96);
serial_outp(info, UART_FCTR, UART_FCTR_TRGD |
UART_FCTR_TX);
serial_outp(info, UART_TRG, UART_TRG_96);
}
serial_outp(info, UART_LCR, 0);
}
if (state->type == PORT_16750) {
/* Wake up UART */
serial_outp(info, UART_IER, 0);
}
if (state->type == PORT_16C950) {
/* Wake up and initialize UART */
info->ACR = 0;
serial_outp(info, UART_LCR, 0xBF);
serial_outp(info, UART_EFR, UART_EFR_ECB);
serial_outp(info, UART_IER, 0);
serial_outp(info, UART_LCR, 0);
serial_icr_write(info, UART_CSR, 0); /* Reset the UART */
serial_outp(info, UART_LCR, 0xBF);
serial_outp(info, UART_EFR, UART_EFR_ECB);
serial_outp(info, UART_LCR, 0);
}
#ifdef CONFIG_SERIAL_RSA
/*
* If this is an RSA port, see if we can kick it up to the
* higher speed clock.
*/
if (state->type == PORT_RSA) {
if (state->baud_base != SERIAL_RSA_BAUD_BASE &&
enable_rsa(info))
state->baud_base = SERIAL_RSA_BAUD_BASE;
if (state->baud_base == SERIAL_RSA_BAUD_BASE)
serial_outp(info, UART_RSA_FRR, 0);
}
#endif
/*
* Clear the FIFO buffers and disable them
* (they will be reenabled in change_speed())
*/
if (uart_config[state->type].flags & UART_CLEAR_FIFO) {
serial_outp(info, UART_FCR, UART_FCR_ENABLE_FIFO);
serial_outp(info, UART_FCR, (UART_FCR_ENABLE_FIFO |
UART_FCR_CLEAR_RCVR |
UART_FCR_CLEAR_XMIT));
serial_outp(info, UART_FCR, 0);
}
/*
* Clear the interrupt registers.
*/
(void) serial_inp(info, UART_LSR);
(void) serial_inp(info, UART_RX);
(void) serial_inp(info, UART_IIR);
(void) serial_inp(info, UART_MSR);
/*
* At this point there's no way the LSR could still be 0xFF;
* if it is, then bail out, because there's likely no UART
* here.
*/
if (!(info->flags & ASYNC_BUGGY_UART) &&
(serial_inp(info, UART_LSR) == 0xff)) {
printk("ttyS%d: LSR safety check engaged!n", state->line);
if (capable(CAP_SYS_ADMIN)) {
if (info->tty)
set_bit(TTY_IO_ERROR, &info->tty->flags);
} else
retval = -ENODEV;
goto errout;
}
/*
* Allocate the IRQ if necessary
*/
if (state->irq && (!IRQ_ports[state->irq] ||
!IRQ_ports[state->irq]->next_port)) {
if (IRQ_ports[state->irq]) {
#ifdef CONFIG_SERIAL_SHARE_IRQ
free_irq(state->irq, &IRQ_ports[state->irq]);
#ifdef CONFIG_SERIAL_MULTIPORT
if (rs_multiport[state->irq].port1)
handler = rs_interrupt_multi;
else
#endif
handler = rs_interrupt;
#else
retval = -EBUSY;
goto errout;
#endif /* CONFIG_SERIAL_SHARE_IRQ */
} else
handler = rs_interrupt_single;
retval = request_irq(state->irq, handler, SA_SHIRQ,
"serial", &IRQ_ports[state->irq]);
if (retval) {
if (capable(CAP_SYS_ADMIN)) {
if (info->tty)
set_bit(TTY_IO_ERROR,
&info->tty->flags);
retval = 0;
}
goto errout;
}
}
/*
* Insert serial port into IRQ chain.
*/
info->prev_port = 0;
info->next_port = IRQ_ports[state->irq];
if (info->next_port)
info->next_port->prev_port = info;
IRQ_ports[state->irq] = info;
figure_IRQ_timeout(state->irq);
/*
* Now, initialize the UART
*/
serial_outp(info, UART_LCR, UART_LCR_WLEN8); /* reset DLAB */
info->MCR = 0;
if (info->tty->termios->c_cflag & CBAUD)
info->MCR = UART_MCR_DTR | UART_MCR_RTS;
#ifdef CONFIG_SERIAL_MANY_PORTS
if (info->flags & ASYNC_FOURPORT) {
if (state->irq == 0)
info->MCR |= UART_MCR_OUT1;
} else
#endif
{
if (state->irq != 0)
info->MCR |= UART_MCR_OUT2;
}
info->MCR |= ALPHA_KLUDGE_MCR; /* Don't ask */
serial_outp(info, UART_MCR, info->MCR);
/*
* Finally, enable interrupts
*/
info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
serial_outp(info, UART_IER, info->IER); /* enable interrupts */
#ifdef CONFIG_SERIAL_MANY_PORTS
if (info->flags & ASYNC_FOURPORT) {
/* Enable interrupts on the AST Fourport board */
ICP = (info->port & 0xFE0) | 0x01F;
outb_p(0x80, ICP);
(void) inb_p(ICP);
}
#endif
/*
* And clear the interrupt registers again for luck.
*/
(void)serial_inp(info, UART_LSR);
(void)serial_inp(info, UART_RX);
(void)serial_inp(info, UART_IIR);
(void)serial_inp(info, UART_MSR);
if (info->tty)
clear_bit(TTY_IO_ERROR, &info->tty->flags);
info->xmit.head = info->xmit.tail = 0;
/*
* Set up serial timers...
*/
mod_timer(&serial_timer, jiffies + 2*HZ/100);
/*
* Set up the tty->alt_speed kludge
*/
#if (LINUX_VERSION_CODE >= 131394) /* Linux 2.1.66 */
if (info->tty) {
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
info->tty->alt_speed = 57600;
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
info->tty->alt_speed = 115200;
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
info->tty->alt_speed = 230400;
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
info->tty->alt_speed = 460800;
}
#endif
/*
* and set the speed of the serial port
*/
change_speed(info, 0);
info->flags |= ASYNC_INITIALIZED;
restore_flags(flags);
return 0;
errout:
restore_flags(flags);
return retval;
}
/*
* This routine will shutdown a serial port; interrupts are disabled, and
* DTR is dropped if the hangup on close termio flag is on.
*/
static void shutdown(struct async_struct * info)
{
unsigned long flags;
struct serial_state *state;
int retval;
if (!(info->flags & ASYNC_INITIALIZED))
return;
state = info->state;
#ifdef SERIAL_DEBUG_OPEN
printk("Shutting down serial port %d (irq %d)....", info->line,
state->irq);
#endif
save_flags(flags); cli(); /* Disable interrupts */
/*
* clear delta_msr_wait queue to avoid mem leaks: we may free the irq
* here so the queue might never be waken up
*/
wake_up_interruptible(&info->delta_msr_wait);
/*
* First unlink the serial port from the IRQ chain...
*/
if (info->next_port)
info->next_port->prev_port = info->prev_port;
if (info->prev_port)
info->prev_port->next_port = info->next_port;
else
IRQ_ports[state->irq] = info->next_port;
figure_IRQ_timeout(state->irq);
/*
* Free the IRQ, if necessary
*/
if (state->irq && (!IRQ_ports[state->irq] ||
!IRQ_ports[state->irq]->next_port)) {
if (IRQ_ports[state->irq]) {
free_irq(state->irq, &IRQ_ports[state->irq]);
retval = request_irq(state->irq, rs_interrupt_single,
SA_SHIRQ, "serial",
&IRQ_ports[state->irq]);
if (retval)
printk("serial shutdown: request_irq: error %d"
" Couldn't reacquire IRQ.n", retval);
} else
free_irq(state->irq, &IRQ_ports[state->irq]);
}
if (info->xmit.buf) {
unsigned long pg = (unsigned long) info->xmit.buf;
info->xmit.buf = 0;
free_page(pg);
}
info->IER = 0;
serial_outp(info, UART_IER, 0x00); /* disable all intrs */
#ifdef CONFIG_SERIAL_MANY_PORTS
if (info->flags & ASYNC_FOURPORT) {
/* reset interrupts on the AST Fourport board */
(void) inb((info->port & 0xFE0) | 0x01F);
info->MCR |= UART_MCR_OUT1;
} else
#endif
info->MCR &= ~UART_MCR_OUT2;
info->MCR |= ALPHA_KLUDGE_MCR; /* Don't ask */
/* disable break condition */
serial_out(info, UART_LCR, serial_inp(info, UART_LCR) & ~UART_LCR_SBC);
if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS);
serial_outp(info, UART_MCR, info->MCR);
/* disable FIFO's */
serial_outp(info, UART_FCR, (UART_FCR_ENABLE_FIFO |
UART_FCR_CLEAR_RCVR |
UART_FCR_CLEAR_XMIT));
serial_outp(info, UART_FCR, 0);
#ifdef CONFIG_SERIAL_RSA
/*
* Reset the RSA board back to 115kbps compat mode.
*/
if ((state->type == PORT_RSA) &&
(state->baud_base == SERIAL_RSA_BAUD_BASE &&
disable_rsa(info)))
state->baud_base = SERIAL_RSA_BAUD_BASE_LO;
#endif
(void)serial_in(info, UART_RX); /* read data port to reset things */
if (info->tty)
set_bit(TTY_IO_ERROR, &info->tty->flags);
if (uart_config[info->state->type].flags & UART_STARTECH) {
/* Arrange to enter sleep mode */
serial_outp(info, UART_LCR, 0xBF);
serial_outp(info, UART_EFR, UART_EFR_ECB);
serial_outp(info, UART_LCR, 0);
serial_outp(info, UART_IER, UART_IERX_SLEEP);
serial_outp(info, UART_LCR, 0xBF);
serial_outp(info, UART_EFR, 0);
serial_outp(info, UART_LCR, 0);
}
if (info->state->type == PORT_16750) {
/* Arrange to enter sleep mode */
serial_outp(info, UART_IER, UART_IERX_SLEEP);
}
info->flags &= ~ASYNC_INITIALIZED;
restore_flags(flags);
}
#if (LINUX_VERSION_CODE < 131394) /* Linux 2.1.66 */
static int baud_table[] = {
0, 50, 75, 110, 134, 150, 200, 300,
600, 1200, 1800, 2400, 4800, 9600, 19200,
38400, 57600, 115200, 230400, 460800, 0 };
static int tty_get_baud_rate(struct tty_struct *tty)
{
struct async_struct * info = (struct async_struct *)tty->driver_data;
unsigned int cflag, i;
cflag = tty->termios->c_cflag;
i = cflag & CBAUD;
if (i & CBAUDEX) {
i &= ~CBAUDEX;
if (i < 1 || i > 2)
tty->termios->c_cflag &= ~CBAUDEX;
else
i += 15;
}
if (i == 15) {
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
i += 1;
if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
i += 2;
}
return baud_table[i];
}
#endif
/*
* This routine is called to set the UART divisor registers to match
* the specified baud rate for a serial port.
*/
static void change_speed(struct async_struct *info,
struct termios *old_termios)
{
int quot = 0, baud_base, baud;
unsigned cflag, cval, fcr = 0;
int bits;
unsigned long flags;
if (!info->tty || !info->tty->termios)
return;
cflag = info->tty->termios->c_cflag;
if (!CONFIGURED_SERIAL_PORT(info))
return;
/* byte size and parity */
switch (cflag & CSIZE) {
case CS5: cval = 0x00; bits = 7; break;
case CS6: cval = 0x01; bits = 8; break;
case CS7: cval = 0x02; bits = 9; break;
case CS8: cval = 0x03; bits = 10; break;
/* Never happens, but GCC is too dumb to figure it out */
default: cval = 0x00; bits = 7; break;
}
if (cflag & CSTOPB) {
cval |= 0x04;
bits++;
}
if (cflag & PARENB) {
cval |= UART_LCR_PARITY;
bits++;
}
if (!(cflag & PARODD))
cval |= UART_LCR_EPAR;
#ifdef CMSPAR
if (cflag & CMSPAR)
cval |= UART_LCR_SPAR;
#endif
/* Determine divisor based on baud rate */
baud = tty_get_baud_rate(info->tty);
if (!baud)
baud = 9600; /* B0 transition handled in rs_set_termios */
#ifdef CONFIG_SERIAL_RSA
if ((info->state->type == PORT_RSA) &&
(info->state->baud_base != SERIAL_RSA_BAUD_BASE) &&
enable_rsa(info))
info->state->baud_base = SERIAL_RSA_BAUD_BASE;
#endif
baud_base = info->state->baud_base;
if (info->state->type == PORT_16C950) {
if (baud <= baud_base)
serial_icr_write(info, UART_TCR, 0);
else if (baud <= 2*baud_base) {
serial_icr_write(info, UART_TCR, 0x8);
baud_base = baud_base * 2;
} else if (baud <= 4*baud_base) {
serial_icr_write(info, UART_TCR, 0x4);
baud_base = baud_base * 4;
} else
serial_icr_write(info, UART_TCR, 0);
}
if (baud == 38400 &&
((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
quot = info->state->custom_divisor;
else {
if (baud == 134)
/* Special case since 134 is really 134.5 */
quot = (2*baud_base / 269);
else if (baud)
quot = baud_base / baud;
}
/* If the quotient is zero refuse the change */
if (!quot && old_termios) {
info->tty->termios->c_cflag &= ~CBAUD;
info->tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD);
baud = tty_get_baud_rate(info->tty);
if (!baud)
baud = 9600;
if (baud == 38400 &&
((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
quot = info->state->custom_divisor;
else {
if (baud == 134)
/* Special case since 134 is really 134.5 */
quot = (2*baud_base / 269);
else if (baud)
quot = baud_base / baud;
}
}
/* As a last resort, if the quotient is zero, default to 9600 bps */
if (!quot)
quot = baud_base / 9600;
/*
* Work around a bug in the Oxford Semiconductor 952 rev B
* chip which causes it to seriously miscalculate baud rates
* when DLL is 0.
*/
if (((quot & 0xFF) == 0) && (info->state->type == PORT_16C950) &&
(info->state->revision == 0x5201))
quot++;
info->quot = quot;
info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base);
info->timeout += HZ/50; /* Add .02 seconds of slop */
/* Set up FIFO's */
if (uart_config[info->state->type].flags & UART_USE_FIFO) {
if ((info->state->baud_base / quot) < 2400)
fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_1;
#ifdef CONFIG_SERIAL_RSA
else if (info->state->type == PORT_RSA)
fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_14;
#endif
else
fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_8;
}
if (info->state->type == PORT_16750)
fcr |= UART_FCR7_64BYTE;
/* CTS flow control flag and modem status interrupts */
info->IER &= ~UART_IER_MSI;
if (info->flags & ASYNC_HARDPPS_CD)
info->IER |= UART_IER_MSI;
if (cflag & CRTSCTS) {
info->flags |= ASYNC_CTS_FLOW;
info->IER |= UART_IER_MSI;
} else
info->flags &= ~ASYNC_CTS_FLOW;
if (cflag & CLOCAL)
info->flags &= ~ASYNC_CHECK_CD;
else {
info->flags |= ASYNC_CHECK_CD;
info->IER |= UART_IER_MSI;
}
serial_out(info, UART_IER, info->IER);
/*
* Set up parity check flag
*/
#define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
if (I_INPCK(info->tty))
info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
info->read_status_mask |= UART_LSR_BI;
/*
* Characters to ignore
*/
info->ignore_status_mask = 0;
if (I_IGNPAR(info->tty))
info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
if (I_IGNBRK(info->tty)) {
info->ignore_status_mask |= UART_LSR_BI;
/*
* If we're ignore parity and break indicators, ignore
* overruns too. (For real raw support).
*/
if (I_IGNPAR(info->tty))
info->ignore_status_mask |= UART_LSR_OE;
}
/*
* !!! ignore all characters if CREAD is not set
*/
if ((cflag & CREAD) == 0)
info->ignore_status_mask |= UART_LSR_DR;
save_flags(flags); cli();
if (uart_config[info->state->type].flags & UART_STARTECH) {
serial_outp(info, UART_LCR, 0xBF);
serial_outp(info, UART_EFR,
(cflag & CRTSCTS) ? UART_EFR_CTS : 0);
}
serial_outp(info, UART_LCR, cval | UART_LCR_DLAB); /* set DLAB */
serial_outp(info, UART_DLL, quot & 0xff); /* LS of divisor */
serial_outp(info, UART_DLM, quot >> 8); /* MS of divisor */
if (info->state->type == PORT_16750)
serial_outp(info, UART_FCR, fcr); /* set fcr */
serial_outp(info, UART_LCR, cval); /* reset DLAB */
info->LCR = cval; /* Save LCR */
if (info->state->type != PORT_16750) {
if (fcr & UART_FCR_ENABLE_FIFO) {
/* emulated UARTs (Lucent Venus 167x) need two steps */
serial_outp(info, UART_FCR, UART_FCR_ENABLE_FIFO);
}
serial_outp(info, UART_FCR, fcr); /* set fcr */
}
restore_flags(flags);
}
static void rs_put_char(struct tty_struct *tty, unsigned char ch)
{
struct async_struct *info = (struct async_struct *)tty->driver_data;
unsigned long flags;
if (serial_paranoia_check(info, tty->device, "rs_put_char"))
return;
if (!tty || !info->xmit.buf)
return;
save_flags(flags); cli();
if (CIRC_SPACE(info->xmit.head,
info->xmit.tail,
SERIAL_XMIT_SIZE) == 0) {
restore_flags(flags);
return;
}
info->xmit.buf[info->xmit.head] = ch;
info->xmit.head = (info->xmit.head + 1) & (SERIAL_XMIT_SIZE-1);
restore_flags(flags);
}
static void rs_flush_chars(struct tty_struct *tty)
{
struct async_struct *info = (struct async_struct *)tty->driver_data;
unsigned long flags;
if (serial_paranoia_check(info, tty->device, "rs_flush_chars"))
return;
if (info->xmit.head == info->xmit.tail
|| tty->stopped
|| tty->hw_stopped
|| !info->xmit.buf)
return;
save_flags(flags); cli();
info->IER |= UART_IER_THRI;
serial_out(info, UART_IER, info->IER);
restore_flags(flags);
}
static int rs_write(struct tty_struct * tty, int from_user,
const unsigned char *buf, int count)
{
int c, ret = 0;
struct async_struct *info = (struct async_struct *)tty->driver_data;
unsigned long flags;
if (serial_paranoia_check(info, tty->device, "rs_write"))
return 0;
if (!tty || !info->xmit.buf || !tmp_buf)
return 0;
save_flags(flags);
if (from_user) {
down(&tmp_buf_sem);
while (1) {
int c1;
c = CIRC_SPACE_TO_END(info->xmit.head,
info->xmit.tail,
SERIAL_XMIT_SIZE);
if (count < c)
c = count;
if (c <= 0)
break;
c -= copy_from_user(tmp_buf, buf, c);
if (!c) {
if (!ret)
ret = -EFAULT;
break;
}
cli();
c1 = CIRC_SPACE_TO_END(info->xmit.head,
info->xmit.tail,
SERIAL_XMIT_SIZE);
if (c1 < c)
c = c1;
memcpy(info->xmit.buf + info->xmit.head, tmp_buf, c);
info->xmit.head = ((info->xmit.head + c) &
(SERIAL_XMIT_SIZE-1));
restore_flags(flags);
buf += c;
count -= c;
ret += c;
}
up(&tmp_buf_sem);
} else {
cli();
while (1) {
c = CIRC_SPACE_TO_END(info->xmit.head,
info->xmit.tail,
SERIAL_XMIT_SIZE);
if (count < c)
c = count;
if (c <= 0) {
break;
}
memcpy(info->xmit.buf + info->xmit.head, buf, c);
info->xmit.head = ((info->xmit.head + c) &
(SERIAL_XMIT_SIZE-1));
buf += c;
count -= c;
ret += c;
}
restore_flags(flags);
}
if (info->xmit.head != info->xmit.tail
&& !tty->stopped
&& !tty->hw_stopped
&& !(info->IER & UART_IER_THRI)) {
info->IER |= UART_IER_THRI;
serial_out(info, UART_IER, info->IER);
}
return ret;
}
static int rs_write_room(struct tty_struct *tty)
{
struct async_struct *info = (struct async_struct *)tty->driver_data;
if (serial_paranoia_check(info, tty->device, "rs_write_room"))
return 0;
return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
}
static int rs_chars_in_buffer(struct tty_struct *tty)
{
struct async_struct *info = (struct async_struct *)tty->driver_data;
if (serial_paranoia_check(info, tty->device, "rs_chars_in_buffer"))
return 0;
return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
}
static void rs_flush_buffer(struct tty_struct *tty)
{
struct async_struct *info = (struct async_struct *)tty->driver_data;
unsigned long flags;
if (serial_paranoia_check(info, tty->device, "rs_flush_buffer"))
return;
save_flags(flags); cli();
info->xmit.head = info->xmit.tail = 0;
restore_flags(flags);
wake_up_interruptible(&tty->write_wait);
#ifdef SERIAL_HAVE_POLL_WAIT
wake_up_interruptible(&tty->poll_wait);
#endif
if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
tty->ldisc.write_wakeup)
(tty->ldisc.write_wakeup)(tty);
}
/*
* This function is used to send a high-priority XON/XOFF character to
* the device
*/
static void rs_send_xchar(struct tty_struct *tty, char ch)
{
struct async_struct *info = (struct async_struct *)tty->driver_data;
if (serial_paranoia_check(info, tty->device, "rs_send_char"))
return;
info->x_char = ch;
if (ch) {
/* Make sure transmit interrupts are on */
info->IER |= UART_IER_THRI;
serial_out(info, UART_IER, info->IER);
}
}
/*
* ------------------------------------------------------------
* rs_throttle()
*
* This routine is called by the upper-layer tty layer to signal that
* incoming characters should be throttled.
* ------------------------------------------------------------
*/
static void rs_throttle(struct tty_struct * tty)
{
struct async_struct *info = (struct async_struct *)tty->driver_data;
unsigned long flags;
#ifdef SERIAL_DEBUG_THROTTLE
char buf[64];
printk("throttle %s: %d....n", tty_name(tty, buf),
tty->ldisc.chars_in_buffer(tty));
#endif
if (serial_paranoia_check(info, tty->device, "rs_throttle"))
return;
if (I_IXOFF(tty))
rs_send_xchar(tty, STOP_CHAR(tty));
if (tty->termios->c_cflag & CRTSCTS)
info->MCR &= ~UART_MCR_RTS;
save_flags(flags); cli();
serial_out(info, UART_MCR, info->MCR);
restore_flags(flags);
}
static void rs_unthrottle(struct tty_struct * tty)
{
struct async_struct *info = (struct async_struct *)tty->driver_data;
unsigned long flags;
#ifdef SERIAL_DEBUG_THROTTLE
char buf[64];
printk("unthrottle %s: %d....n", tty_name(tty, buf),
tty->ldisc.chars_in_buffer(tty));
#endif
if (serial_paranoia_check(info, tty->device, "rs_unthrottle"))
return;
if (I_IXOFF(tty)) {
if (info->x_char)
info->x_char = 0;
else
rs_send_xchar(tty, START_CHAR(tty));
}
if (tty->termios->c_cflag & CRTSCTS)
info->MCR |= UART_MCR_RTS;
save_flags(flags); cli();
serial_out(info, UART_MCR, info->MCR);
restore_flags(flags);
}
/*
* ------------------------------------------------------------
* rs_ioctl() and friends
* ------------------------------------------------------------
*/
static int get_serial_info(struct async_struct * info,
struct serial_struct * retinfo)
{
struct serial_struct tmp;
struct serial_state *state = info->state;
if (!retinfo)
return -EFAULT;
memset(&tmp, 0, sizeof(tmp));
tmp.type = state->type;
tmp.line = state->line;
tmp.port = state->port;
if (HIGH_BITS_OFFSET)
tmp.port_high = state->port >> HIGH_BITS_OFFSET;
else
tmp.port_high = 0;
tmp.irq = state->irq;
tmp.flags = state->flags;
tmp.xmit_fifo_size = state->xmit_fifo_size;
tmp.baud_base = state->baud_base;
tmp.close_delay = state->close_delay;
tmp.closing_wait = state->closing_wait;
tmp.custom_divisor = state->custom_divisor;
tmp.hub6 = state->hub6;
tmp.io_type = state->io_type;
if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
return -EFAULT;
return 0;
}
static int set_serial_info(struct async_struct * info,
struct serial_struct * new_info)
{
struct serial_struct new_serial;
struct serial_state old_state, *state;
unsigned int i,change_irq,change_port;
int retval = 0;
unsigned long new_port;
if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
return -EFAULT;
state = info->state;
old_state = *state;
new_port = new_serial.port;
if (HIGH_BITS_OFFSET)
new_port += (unsigned long) new_serial.port_high << HIGH_BITS_OFFSET;
change_irq = new_serial.irq != state->irq;
change_port = (new_port != ((int) state->port)) ||
(new_serial.hub6 != state->hub6);
if (!capable(CAP_SYS_ADMIN)) {
if (change_irq || change_port ||
(new_serial.baud_base != state->baud_base) ||
(new_serial.type != state->type) ||
(new_serial.close_delay != state->close_delay) ||
(new_serial.xmit_fifo_size != state->xmit_fifo_size) ||
((new_serial.flags & ~ASYNC_USR_MASK) !=
(state->flags & ~ASYNC_USR_MASK)))
return -EPERM;
state->flags = ((state->flags & ~ASYNC_USR_MASK) |
(new_serial.flags & ASYNC_USR_MASK));
info->flags = ((info->flags & ~ASYNC_USR_MASK) |
(new_serial.flags & ASYNC_USR_MASK));
state->custom_divisor = new_serial.custom_divisor;
goto check_and_exit;
}
new_serial.irq = irq_cannonicalize(new_serial.irq);
if ((new_serial.irq >= NR_IRQS) || (new_serial.irq < 0) ||
(new_serial.baud_base < 9600)|| (new_serial.type < PORT_UNKNOWN) ||
(new_serial.type > PORT_MAX) || (new_serial.type == PORT_CIRRUS) ||
(new_serial.type == PORT_STARTECH)) {
return -EINVAL;
}
if ((new_serial.type != state->type) ||
(new_serial.xmit_fifo_size <= 0))
new_serial.xmit_fifo_size =
uart_config[new_serial.type].dfl_xmit_fifo_size;
/* Make sure address is not already in use */
if (new_serial.type) {
for (i = 0 ; i < NR_PORTS; i++)
if ((state != &rs_table[i]) &&
(rs_table[i].io_type == SERIAL_IO_PORT) &&
(rs_table[i].port == new_port) &&
rs_table[i].type)
return -EADDRINUSE;
}
if ((change_port || change_irq) && (state->count > 1))
return -EBUSY;
/*
* OK, past this point, all the error checking has been done.
* At this point, we start making changes.....
*/
state->baud_base = new_serial.baud_base;
state->flags = ((state->flags & ~ASYNC_FLAGS) |
(new_serial.flags & ASYNC_FLAGS));
info->flags = ((state->flags & ~ASYNC_INTERNAL_FLAGS) |
(info->flags & ASYNC_INTERNAL_FLAGS));
state->custom_divisor = new_serial.custom_divisor;
state->close_delay = new_serial.close_delay * HZ/100;
state->closing_wait = new_serial.closing_wait * HZ/100;
#if (LINUX_VERSION_CODE > 0x20100)
info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
#endif
info->xmit_fifo_size = state->xmit_fifo_size =
new_serial.xmit_fifo_size;
if ((state->type != PORT_UNKNOWN) && state->port) {
#ifdef CONFIG_SERIAL_RSA
if (old_state.type == PORT_RSA)
release_region(state->port + UART_RSA_BASE, 16);
else
#endif
release_region(state->port,8);
}
state->type = new_serial.type;
if (change_port || change_irq) {
/*
* We need to shutdown the serial port at the old
* port/irq combination.
*/
shutdown(info);
state->irq = new_serial.irq;
info->port = state->port = new_port;
info->hub6 = state->hub6 = new_serial.hub6;
if (info->hub6)
info->io_type = state->io_type = SERIAL_IO_HUB6;
else if (info->io_type == SERIAL_IO_HUB6)
info->io_type = state->io_type = SERIAL_IO_PORT;
}
if ((state->type != PORT_UNKNOWN) && state->port) {
#ifdef CONFIG_SERIAL_RSA
if (state->type == PORT_RSA)
request_region(state->port + UART_RSA_BASE,
16, "serial_rsa(set)");
else
#endif
request_region(state->port,8,"serial(set)");
}
check_and_exit:
if ((!state->port && !state->iomem_base) || !state->type)
return 0;
if (info->flags & ASYNC_INITIALIZED) {
if (((old_state.flags & ASYNC_SPD_MASK) !=
(state->flags & ASYNC_SPD_MASK)) ||
(old_state.custom_divisor != state->custom_divisor)) {
#if (LINUX_VERSION_CODE >= 131394) /* Linux 2.1.66 */
if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
info->tty->alt_speed = 57600;
if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
info->tty->alt_speed = 115200;
if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
info->tty->alt_speed = 230400;
if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
info->tty->alt_speed = 460800;
#endif
change_speed(info, 0);
}
} else
retval = startup(info);
return retval;
}
/*
* get_lsr_info - get line status register info
*
* Purpose: Let user call ioctl() to get info when the UART physically
* is emptied. On bus types like RS485, the transmitter must
* release the bus after transmitting. This must be done when
* the transmit shift register is empty, not be done when the
* transmit holding register is empty. This functionality
* allows an RS485 driver to be written in user space.
*/
static int get_lsr_info(struct async_struct * info, unsigned int *value)
{
unsigned char status;
unsigned int result;
unsigned long flags;
save_flags(flags); cli();
status = serial_in(info, UART_LSR);
restore_flags(flags);
result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
/*
* If we're about to load something into the transmit
* register, we'll pretend the transmitter isn't empty to
* avoid a race condition (depending on when the transmit
* interrupt happens).
*/
if (info->x_char ||
((CIRC_CNT(info->xmit.head, info->xmit.tail,
SERIAL_XMIT_SIZE) > 0) &&
!info->tty->stopped && !info->tty->hw_stopped))
result &= ~TIOCSER_TEMT;
if (copy_to_user(value, &result, sizeof(int)))
return -EFAULT;
return 0;
}
static int get_modem_info(struct async_struct * info, unsigned int *value)
{
unsigned char control, status;
unsigned int result;
unsigned long flags;
control = info->MCR;
save_flags(flags); cli();
status = serial_in(info, UART_MSR);
restore_flags(flags);
result = ((control & UART_MCR_RTS) ? TIOCM_RTS : 0)
| ((control & UART_MCR_DTR) ? TIOCM_DTR : 0)
#ifdef TIOCM_OUT1
| ((control & UART_MCR_OUT1) ? TIOCM_OUT1 : 0)
| ((control & UART_MCR_OUT2) ? TIOCM_OUT2 : 0)
#endif
| ((status & UART_MSR_DCD) ? TIOCM_CAR : 0)
| ((status & UART_MSR_RI) ? TIOCM_RNG : 0)
| ((status & UART_MSR_DSR) ? TIOCM_DSR : 0)
| ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
if (copy_to_user(value, &result, sizeof(int)))
return -EFAULT;
return 0;
}
static int set_modem_info(struct async_struct * info, unsigned int cmd,
unsigned int *value)
{
unsigned int arg;
unsigned long flags;
if (copy_from_user(&arg, value, sizeof(int)))
return -EFAULT;
switch (cmd) {
case TIOCMBIS:
if (arg & TIOCM_RTS)
info->MCR |= UART_MCR_RTS;
if (arg & TIOCM_DTR)
info->MCR |= UART_MCR_DTR;
#ifdef TIOCM_OUT1
if (arg & TIOCM_OUT1)
info->MCR |= UART_MCR_OUT1;
if (arg & TIOCM_OUT2)
info->MCR |= UART_MCR_OUT2;
#endif
if (arg & TIOCM_LOOP)
info->MCR |= UART_MCR_LOOP;
break;
case TIOCMBIC:
if (arg & TIOCM_RTS)
info->MCR &= ~UART_MCR_RTS;
if (arg & TIOCM_DTR)
info->MCR &= ~UART_MCR_DTR;
#ifdef TIOCM_OUT1
if (arg & TIOCM_OUT1)
info->MCR &= ~UART_MCR_OUT1;
if (arg & TIOCM_OUT2)
info->MCR &= ~UART_MCR_OUT2;
#endif
if (arg & TIOCM_LOOP)
info->MCR &= ~UART_MCR_LOOP;
break;
case TIOCMSET:
info->MCR = ((info->MCR & ~(UART_MCR_RTS |
#ifdef TIOCM_OUT1
UART_MCR_OUT1 |
UART_MCR_OUT2 |
#endif
UART_MCR_LOOP |
UART_MCR_DTR))
| ((arg & TIOCM_RTS) ? UART_MCR_RTS : 0)
#ifdef TIOCM_OUT1
| ((arg & TIOCM_OUT1) ? UART_MCR_OUT1 : 0)
| ((arg & TIOCM_OUT2) ? UART_MCR_OUT2 : 0)
#endif
| ((arg & TIOCM_LOOP) ? UART_MCR_LOOP : 0)
| ((arg & TIOCM_DTR) ? UART_MCR_DTR : 0));
break;
default:
return -EINVAL;
}
save_flags(flags); cli();
info->MCR |= ALPHA_KLUDGE_MCR; /* Don't ask */
serial_out(info, UART_MCR, info->MCR);
restore_flags(flags);
return 0;
}
static int do_autoconfig(struct async_struct * info)
{
int irq, retval;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (info->state->count > 1)
return -EBUSY;
shutdown(info);
autoconfig(info->state);
if ((info->state->flags & ASYNC_AUTO_IRQ) &&
(info->state->port != 0 || info->state->iomem_base != 0) &&
(info->state->type != PORT_UNKNOWN)) {
irq = detect_uart_irq(info->state);
if (irq > 0)
info->state->irq = irq;
}
retval = startup(info);
if (retval)
return retval;
return 0;
}
/*
* rs_break() --- routine which turns the break handling on or off
*/
#if (LINUX_VERSION_CODE < 131394) /* Linux 2.1.66 */
static void send_break( struct async_struct * info, int duration)
{
if (!CONFIGURED_SERIAL_PORT(info))
return;
current->state = TASK_INTERRUPTIBLE;
current->timeout = jiffies + duration;
cli();
info->LCR |= UART_LCR_SBC;
serial_out(info, UART_LCR, info->LCR);
schedule();
info->LCR &= ~UART_LCR_SBC;
serial_out(info, UART_LCR, info->LCR);
sti();
}
#else
static void rs_break(struct tty_struct *tty, int break_state)
{
struct async_struct * info = (struct async_struct *)tty->driver_data;
unsigned long flags;
if (serial_paranoia_check(info, tty->device, "rs_break"))
return;
if (!CONFIGURED_SERIAL_PORT(info))
return;
save_flags(flags); cli();
if (break_state == -1)
info->LCR |= UART_LCR_SBC;
else
info->LCR &= ~UART_LCR_SBC;
serial_out(info, UART_LCR, info->LCR);
restore_flags(flags);
}
#endif
#ifdef CONFIG_SERIAL_MULTIPORT
static int get_multiport_struct(struct async_struct * info,
struct serial_multiport_struct *retinfo)
{
struct serial_multiport_struct ret;
struct rs_multiport_struct *multi;
multi = &rs_multiport[info->state->irq];
ret.port_monitor = multi->port_monitor;
ret.port1 = multi->port1;
ret.mask1 = multi->mask1;
ret.match1 = multi->match1;
ret.port2 = multi->port2;
ret.mask2 = multi->mask2;
ret.match2 = multi->match2;
ret.port3 = multi->port3;
ret.mask3 = multi->mask3;
ret.match3 = multi->match3;
ret.port4 = multi->port4;
ret.mask4 = multi->mask4;
ret.match4 = multi->match4;
ret.irq = info->state->irq;
if (copy_to_user(retinfo,&ret,sizeof(*retinfo)))
return -EFAULT;
return 0;
}
static int set_multiport_struct(struct async_struct * info,
struct serial_multiport_struct *in_multi)
{
struct serial_multiport_struct new_multi;
struct rs_multiport_struct *multi;
struct serial_state *state;
int was_multi, now_multi;
int retval;
void (*handler)(int, void *, struct pt_regs *);
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
state = info->state;
if (copy_from_user(&new_multi, in_multi,
sizeof(struct serial_multiport_struct)))
return -EFAULT;
if (new_multi.irq != state->irq || state->irq == 0 ||
!IRQ_ports[state->irq])
return -EINVAL;
multi = &rs_multiport[state->irq];
was_multi = (multi->port1 != 0);
multi->port_monitor = new_multi.port_monitor;
if (multi->port1)
release_region(multi->port1,1);
multi->port1 = new_multi.port1;
multi->mask1 = new_multi.mask1;
multi->match1 = new_multi.match1;
if (multi->port1)
request_region(multi->port1,1,"serial(multiport1)");
if (multi->port2)
release_region(multi->port2,1);
multi->port2 = new_multi.port2;
multi->mask2 = new_multi.mask2;
multi->match2 = new_multi.match2;
if (multi->port2)
request_region(multi->port2,1,"serial(multiport2)");
if (multi->port3)
release_region(multi->port3,1);
multi->port3 = new_multi.port3;
multi->mask3 = new_multi.mask3;
multi->match3 = new_multi.match3;
if (multi->port3)
request_region(multi->port3,1,"serial(multiport3)");
if (multi->port4)
release_region(multi->port4,1);
multi->port4 = new_multi.port4;
multi->mask4 = new_multi.mask4;
multi->match4 = new_multi.match4;
if (multi->port4)
request_region(multi->port4,1,"serial(multiport4)");
now_multi = (multi->port1 != 0);
if (IRQ_ports[state->irq]->next_port &&
(was_multi != now_multi)) {
free_irq(state->irq, &IRQ_ports[state->irq]);
if (now_multi)
handler = rs_interrupt_multi;
else
handler = rs_interrupt;
retval = request_irq(state->irq, handler, SA_SHIRQ,
"serial", &IRQ_ports[state->irq]);
if (retval) {
printk("Couldn't reallocate serial interrupt "
"driver!!n");
}
}
return 0;
}
#endif
static int rs_ioctl(struct tty_struct *tty, struct file * file,
unsigned int cmd, unsigned long arg)
{
struct async_struct * info = (struct async_struct *)tty->driver_data;
struct async_icount cprev, cnow; /* kernel counter temps */
struct serial_icounter_struct icount;
unsigned long flags;
#if (LINUX_VERSION_CODE < 131394) /* Linux 2.1.66 */
int retval, tmp;
#endif
if (serial_paranoia_check(info, tty->device, "rs_ioctl"))
return -ENODEV;
if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
(cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
(cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
if (tty->flags & (1 << TTY_IO_ERROR))
return -EIO;
}
switch (cmd) {
#if (LINUX_VERSION_CODE < 131394) /* Linux 2.1.66 */
case TCSBRK: /* SVID version: non-zero arg --> no break */
retval = tty_check_change(tty);
if (retval)
return retval;
tty_wait_until_sent(tty, 0);
if (signal_pending(current))
return -EINTR;
if (!arg) {
send_break(info, HZ/4); /* 1/4 second */
if (signal_pending(current))
return -EINTR;
}
return 0;
case TCSBRKP: /* support for POSIX tcsendbreak() */
retval = tty_check_change(tty);
if (retval)
return retval;
tty_wait_until_sent(tty, 0);
if (signal_pending(current))
return -EINTR;
send_break(info, arg ? arg*(HZ/10) : HZ/4);
if (signal_pending(current))
return -EINTR;
return 0;
case TIOCGSOFTCAR:
tmp = C_CLOCAL(tty) ? 1 : 0;
if (copy_to_user((void *)arg, &tmp, sizeof(int)))
return -EFAULT;
return 0;
case TIOCSSOFTCAR:
if (copy_from_user(&tmp, (void *)arg, sizeof(int)))
return -EFAULT;
tty->termios->c_cflag =
((tty->termios->c_cflag & ~CLOCAL) |
(tmp ? CLOCAL : 0));
return 0;
#endif
case TIOCMGET:
return get_modem_info(info, (unsigned int *) arg);
case TIOCMBIS:
case TIOCMBIC:
case TIOCMSET:
return set_modem_info(info, cmd, (unsigned int *) arg);
case TIOCGSERIAL:
return get_serial_info(info,
(struct serial_struct *) arg);
case TIOCSSERIAL:
return set_serial_info(info,
(struct serial_struct *) arg);
case TIOCSERCONFIG:
return do_autoconfig(info);
case TIOCSERGETLSR: /* Get line status register */
return get_lsr_info(info, (unsigned int *) arg);
case TIOCSERGSTRUCT:
if (copy_to_user((struct async_struct *) arg,
info, sizeof(struct async_struct)))
return -EFAULT;
return 0;
#ifdef CONFIG_SERIAL_MULTIPORT
case TIOCSERGETMULTI:
return get_multiport_struct(info,
(struct serial_multiport_struct *) arg);
case TIOCSERSETMULTI:
return set_multiport_struct(info,
(struct serial_multiport_struct *) arg);
#endif
/*
* Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
* - mask passed in arg for lines of interest
* (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
* Caller should use TIOCGICOUNT to see which one it was
*/
case TIOCMIWAIT:
save_flags(flags); cli();
/* note the counters on entry */
cprev = info->state->icount;
restore_flags(flags);
/* Force modem status interrupts on */
info->IER |= UART_IER_MSI;
serial_out(info, UART_IER, info->IER);
while (1) {
interruptible_sleep_on(&info->delta_msr_wait);
/* see if a signal did it */
if (signal_pending(current))
return -ERESTARTSYS;
save_flags(flags); cli();
cnow = info->state->icount; /* atomic copy */
restore_flags(flags);
if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
return -EIO; /* no change => error */
if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
return 0;
}
cprev = cnow;
}
/* NOTREACHED */
/*
* Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
* Return: write counters to the user passed counter struct
* NB: both 1->0 and 0->1 transitions are counted except for
* RI where only 0->1 is counted.
*/
case TIOCGICOUNT:
save_flags(flags); cli();
cnow = info->state->icount;
restore_flags(flags);
icount.cts = cnow.cts;
icount.dsr = cnow.dsr;
icount.rng = cnow.rng;
icount.dcd = cnow.dcd;
icount.rx = cnow.rx;
icount.tx = cnow.tx;
icount.frame = cnow.frame;
icount.overrun = cnow.overrun;
icount.parity = cnow.parity;
icount.brk = cnow.brk;
icount.buf_overrun = cnow.buf_overrun;
if (copy_to_user((void *)arg, &icount, sizeof(icount)))
return -EFAULT;
return 0;
case TIOCSERGWILD:
case TIOCSERSWILD:
/* "setserial -W" is called in Debian boot */
printk ("TIOCSER?WILD ioctl obsolete, ignored.n");
return 0;
default:
return -ENOIOCTLCMD;
}
return 0;
}
static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios)
{
struct async_struct *info = (struct async_struct *)tty->driver_data;
unsigned long flags;
unsigned int cflag = tty->termios->c_cflag;
if ( (cflag == old_termios->c_cflag)
&& ( RELEVANT_IFLAG(tty->termios->c_iflag)
== RELEVANT_IFLAG(old_termios->c_iflag)))
return;
change_speed(info, old_termios);
/* Handle transition to B0 status */
if ((old_termios->c_cflag & CBAUD) &&
!(cflag & CBAUD)) {
info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS);
save_flags(flags); cli();
serial_out(info, UART_MCR, info->MCR);
restore_flags(flags);
}
/* Handle transition away from B0 status */
if (!(old_termios->c_cflag & CBAUD) &&
(cflag & CBAUD)) {
info->MCR |= UART_MCR_DTR;
if (!(tty->termios->c_cflag & CRTSCTS) ||
!test_bit(TTY_THROTTLED, &tty->flags)) {
info->MCR |= UART_MCR_RTS;
}
save_flags(flags); cli();
serial_out(info, UART_MCR, info->MCR);
restore_flags(flags);
}
/* Handle turning off CRTSCTS */
if ((old_termios->c_cflag & CRTSCTS) &&
!(tty->termios->c_cflag & CRTSCTS)) {
tty->hw_stopped = 0;
rs_start(tty);
}
#if 0
/*
* No need to wake up processes in open wait, since they
* sample the CLOCAL flag once, and don't recheck it.
* XXX It's not clear whether the current behavior is correct
* or not. Hence, this may change.....
*/
if (!(old_termios->c_cflag & CLOCAL) &&
(tty->termios->c_cflag & CLOCAL))
wake_up_interruptible(&info->open_wait);
#endif
}
/*
* ------------------------------------------------------------
* rs_close()
*
* This routine is called when the serial port gets closed. First, we
* wait for the last remaining data to be sent. Then, we unlink its
* async structure from the interrupt chain if necessary, and we free
* that IRQ if nothing is left in the chain.
* ------------------------------------------------------------
*/
static void rs_close(struct tty_struct *tty, struct file * filp)
{
struct async_struct * info = (struct async_struct *)tty->driver_data;
struct serial_state *state;
unsigned long flags;
if (!info || serial_paranoia_check(info, tty->device, "rs_close"))
return;
state = info->state;
save_flags(flags); cli();
if (tty_hung_up_p(filp)) {
DBG_CNT("before DEC-hung");
MOD_DEC_USE_COUNT;
restore_flags(flags);
return;
}
#ifdef SERIAL_DEBUG_OPEN
printk("rs_close ttys%d, count = %dn", info->line, state->count);
#endif
if ((tty->count == 1) && (state->count != 1)) {
/*
* Uh, oh. tty->count is 1, which means that the tty
* structure will be freed. state->count should always
* be one in these conditions. If it's greater than
* one, we've got real problems, since it means the
* serial port won't be shutdown.
*/
printk("rs_close: bad serial port count; tty->count is 1, "
"state->count is %dn", state->count);
state->count = 1;
}
if (--state->count < 0) {
printk("rs_close: bad serial port count for ttys%d: %dn",
info->line, state->count);
state->count = 0;
}
if (state->count) {
DBG_CNT("before DEC-2");
MOD_DEC_USE_COUNT;
restore_flags(flags);
return;
}
info->flags |= ASYNC_CLOSING;
restore_flags(flags);
/*
* Save the termios structure, since this port may have
* separate termios for callout and dialin.
*/
if (info->flags & ASYNC_NORMAL_ACTIVE)
info->state->normal_termios = *tty->termios;
if (info->flags & ASYNC_CALLOUT_ACTIVE)
info->state->callout_termios = *tty->termios;
/*
* Now we wait for the transmit buffer to clear; and we notify
* the line discipline to only process XON/XOFF characters.
*/
tty->closing = 1;
if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
tty_wait_until_sent(tty, info->closing_wait);
/*
* At this point we stop accepting input. To do this, we
* disable the receive line status interrupts, and tell the
* interrupt driver to stop checking the data ready bit in the
* line status register.
*/
info->IER &= ~UART_IER_RLSI;
info->read_status_mask &= ~UART_LSR_DR;
if (info->flags & ASYNC_INITIALIZED) {
serial_out(info, UART_IER, info->IER);
/*
* Before we drop DTR, make sure the UART transmitter
* has completely drained; this is especially
* important if there is a transmit FIFO!
*/
rs_wait_until_sent(tty, info->timeout);
}
shutdown(info);
if (tty->driver.flush_buffer)
tty->driver.flush_buffer(tty);
if (tty->ldisc.flush_buffer)
tty->ldisc.flush_buffer(tty);
tty->closing = 0;
info->event = 0;
info->tty = 0;
if (info->blocked_open) {
if (info->close_delay) {
set_current_state(TASK_INTERRUPTIBLE);
schedule_timeout(info->close_delay);
}
wake_up_interruptible(&info->open_wait);
}
info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE|
ASYNC_CLOSING);
wake_up_interruptible(&info->close_wait);
MOD_DEC_USE_COUNT;
}
/*
* rs_wait_until_sent() --- wait until the transmitter is empty
*/
static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
{
struct async_struct * info = (struct async_struct *)tty->driver_data;
unsigned long orig_jiffies, char_time;
int lsr;
if (serial_paranoia_check(info, tty->device, "rs_wait_until_sent"))
return;
if (info->state->type == PORT_UNKNOWN)
return;
if (info->xmit_fifo_size == 0)
return; /* Just in case.... */
orig_jiffies = jiffies;
/*
* Set the check interval to be 1/5 of the estimated time to
* send a single character, and make it at least 1. The check
* interval should also be less than the timeout.
*
* Note: we have to use pretty tight timings here to satisfy
* the NIST-PCTS.
*/
char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
char_time = char_time / 5;
if (char_time == 0)
char_time = 1;
if (timeout && timeout < char_time)
char_time = timeout;
/*
* If the transmitter hasn't cleared in twice the approximate
* amount of time to send the entire FIFO, it probably won't
* ever clear. This assumes the UART isn't doing flow
* control, which is currently the case. Hence, if it ever
* takes longer than info->timeout, this is probably due to a
* UART bug of some kind. So, we clamp the timeout parameter at
* 2*info->timeout.
*/
if (!timeout || timeout > 2*info->timeout)
timeout = 2*info->timeout;
#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
printk("jiff=%lu...", jiffies);
#endif
while (!((lsr = serial_inp(info, UART_LSR)) & UART_LSR_TEMT)) {
#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
printk("lsr = %d (jiff=%lu)...", lsr, jiffies);
#endif
set_current_state(TASK_INTERRUPTIBLE);
schedule_timeout(char_time);
if (signal_pending(current))
break;
if (timeout && time_after(jiffies, orig_jiffies + timeout))
break;
}
#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
printk("lsr = %d (jiff=%lu)...donen", lsr, jiffies);
#endif
}
/*
* rs_hangup() --- called by tty_hangup() when a hangup is signaled.
*/
static void rs_hangup(struct tty_struct *tty)
{
struct async_struct * info = (struct async_struct *)tty->driver_data;
struct serial_state *state = info->state;
if (serial_paranoia_check(info, tty->device, "rs_hangup"))
return;
state = info->state;
rs_flush_buffer(tty);
if (info->flags & ASYNC_CLOSING)
return;
shutdown(info);
info->event = 0;
state->count = 0;
info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE);
info->tty = 0;
wake_up_interruptible(&info->open_wait);
}
/*
* ------------------------------------------------------------
* rs_open() and friends
* ------------------------------------------------------------
*/
static int block_til_ready(struct tty_struct *tty, struct file * filp,
struct async_struct *info)
{
DECLARE_WAITQUEUE(wait, current);
struct serial_state *state = info->state;
int retval;
int do_clocal = 0, extra_count = 0;
unsigned long flags;
/*
* If the device is in the middle of being closed, then block
* until it's done, and then try again.
*/
if (tty_hung_up_p(filp) ||
(info->flags & ASYNC_CLOSING)) {
if (info->flags & ASYNC_CLOSING)
interruptible_sleep_on(&info->close_wait);
#ifdef SERIAL_DO_RESTART
return ((info->flags & ASYNC_HUP_NOTIFY) ?
-EAGAIN : -ERESTARTSYS);
#else
return -EAGAIN;
#endif
}
/*
* If this is a callout device, then just make sure the normal
* device isn't being used.
*/
if (tty->driver.subtype == SERIAL_TYPE_CALLOUT) {
if (info->flags & ASYNC_NORMAL_ACTIVE)
return -EBUSY;
if ((info->flags & ASYNC_CALLOUT_ACTIVE) &&
(info->flags & ASYNC_SESSION_LOCKOUT) &&
(info->session != current->session))
return -EBUSY;
if ((info->flags & ASYNC_CALLOUT_ACTIVE) &&
(info->flags & ASYNC_PGRP_LOCKOUT) &&
(info->pgrp != current->pgrp))
return -EBUSY;
info->flags |= ASYNC_CALLOUT_ACTIVE;
return 0;
}
/*
* If non-blocking mode is set, or the port is not enabled,
* then make the check up front and then exit.
*/
if ((filp->f_flags & O_NONBLOCK) ||
(tty->flags & (1 << TTY_IO_ERROR))) {