mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
![Alan Cox](/assets/img/avatar_default.png)
This is the first step to generalising the various pieces of waiting logic duplicated in all sorts of serial drivers. Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2534 lines
66 KiB
C
2534 lines
66 KiB
C
/*
|
|
* esp.c - driver for Hayes ESP serial cards
|
|
*
|
|
* --- Notices from serial.c, upon which this driver is based ---
|
|
*
|
|
* Copyright (C) 1991, 1992 Linus Torvalds
|
|
*
|
|
* 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 Anhäupl 05/17/96.
|
|
*
|
|
* --- End of notices from serial.c ---
|
|
*
|
|
* Support for the ESP serial card by Andrew J. Robinson
|
|
* <arobinso@nyx.net> (Card detection routine taken from a patch
|
|
* by Dennis J. Boylan). Patches to allow use with 2.1.x contributed
|
|
* by Chris Faylor.
|
|
*
|
|
* Most recent changes: (Andrew J. Robinson)
|
|
* Support for PIO mode. This allows the driver to work properly with
|
|
* multiport cards.
|
|
*
|
|
* Arnaldo Carvalho de Melo <acme@conectiva.com.br> -
|
|
* several cleanups, use module_init/module_exit, etc
|
|
*
|
|
* This module exports the following rs232 io functions:
|
|
*
|
|
* int espserial_init(void);
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/signal.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/tty.h>
|
|
#include <linux/tty_flip.h>
|
|
#include <linux/serial.h>
|
|
#include <linux/serialP.h>
|
|
#include <linux/serial_reg.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/init.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/bitops.h>
|
|
|
|
#include <asm/system.h>
|
|
#include <linux/io.h>
|
|
|
|
#include <asm/dma.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/uaccess.h>
|
|
|
|
#include <linux/hayesesp.h>
|
|
|
|
#define NR_PORTS 64 /* maximum number of ports */
|
|
#define NR_PRIMARY 8 /* maximum number of primary ports */
|
|
#define REGION_SIZE 8 /* size of io region to request */
|
|
|
|
/* The following variables can be set by giving module options */
|
|
static int irq[NR_PRIMARY]; /* IRQ for each base port */
|
|
static unsigned int divisor[NR_PRIMARY]; /* custom divisor for each port */
|
|
static unsigned int dma = ESP_DMA_CHANNEL; /* DMA channel */
|
|
static unsigned int rx_trigger = ESP_RX_TRIGGER;
|
|
static unsigned int tx_trigger = ESP_TX_TRIGGER;
|
|
static unsigned int flow_off = ESP_FLOW_OFF;
|
|
static unsigned int flow_on = ESP_FLOW_ON;
|
|
static unsigned int rx_timeout = ESP_RX_TMOUT;
|
|
static unsigned int pio_threshold = ESP_PIO_THRESHOLD;
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_param_array(irq, int, NULL, 0);
|
|
module_param_array(divisor, uint, NULL, 0);
|
|
module_param(dma, uint, 0);
|
|
module_param(rx_trigger, uint, 0);
|
|
module_param(tx_trigger, uint, 0);
|
|
module_param(flow_off, uint, 0);
|
|
module_param(flow_on, uint, 0);
|
|
module_param(rx_timeout, uint, 0);
|
|
module_param(pio_threshold, uint, 0);
|
|
|
|
/* END */
|
|
|
|
static char *dma_buffer;
|
|
static int dma_bytes;
|
|
static struct esp_pio_buffer *free_pio_buf;
|
|
|
|
#define DMA_BUFFER_SZ 1024
|
|
|
|
#define WAKEUP_CHARS 1024
|
|
|
|
static char serial_name[] __initdata = "ESP serial driver";
|
|
static char serial_version[] __initdata = "2.2";
|
|
|
|
static struct tty_driver *esp_driver;
|
|
|
|
/*
|
|
* Serial driver configuration section. Here are the various options:
|
|
*
|
|
* SERIAL_PARANOIA_CHECK
|
|
* Check the magic number for the esp_structure where
|
|
* ever possible.
|
|
*/
|
|
|
|
#undef SERIAL_PARANOIA_CHECK
|
|
#define SERIAL_DO_RESTART
|
|
|
|
#undef SERIAL_DEBUG_INTR
|
|
#undef SERIAL_DEBUG_OPEN
|
|
#undef SERIAL_DEBUG_FLOW
|
|
|
|
#if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
|
|
#define DBG_CNT(s) printk(KERN_DEBUG "(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
|
|
tty->name, info->port.flags, \
|
|
serial_driver.refcount, \
|
|
info->port.count, tty->count, s)
|
|
#else
|
|
#define DBG_CNT(s)
|
|
#endif
|
|
|
|
static struct esp_struct *ports;
|
|
|
|
static void change_speed(struct esp_struct *info);
|
|
static void rs_wait_until_sent(struct tty_struct *, int);
|
|
|
|
/*
|
|
* The ESP card has a clock rate of 14.7456 MHz (that is, 2**ESPC_SCALE
|
|
* times the normal 1.8432 Mhz clock of most serial boards).
|
|
*/
|
|
#define BASE_BAUD ((1843200 / 16) * (1 << ESPC_SCALE))
|
|
|
|
/* Standard COM flags (except for COM4, because of the 8514 problem) */
|
|
#define STD_COM_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST)
|
|
|
|
static inline int serial_paranoia_check(struct esp_struct *info,
|
|
char *name, const char *routine)
|
|
{
|
|
#ifdef SERIAL_PARANOIA_CHECK
|
|
static const char badmagic[] = KERN_WARNING
|
|
"Warning: bad magic number for serial struct (%s) in %s\n";
|
|
static const char badinfo[] = KERN_WARNING
|
|
"Warning: null esp_struct for (%s) in %s\n";
|
|
|
|
if (!info) {
|
|
printk(badinfo, name, routine);
|
|
return 1;
|
|
}
|
|
if (info->magic != ESP_MAGIC) {
|
|
printk(badmagic, name, routine);
|
|
return 1;
|
|
}
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
static inline unsigned int serial_in(struct esp_struct *info, int offset)
|
|
{
|
|
return inb(info->io_port + offset);
|
|
}
|
|
|
|
static inline void serial_out(struct esp_struct *info, int offset,
|
|
unsigned char value)
|
|
{
|
|
outb(value, info->io_port+offset);
|
|
}
|
|
|
|
/*
|
|
* ------------------------------------------------------------
|
|
* 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 esp_struct *info = tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_stop"))
|
|
return;
|
|
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
if (info->IER & UART_IER_THRI) {
|
|
info->IER &= ~UART_IER_THRI;
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
|
|
serial_out(info, UART_ESI_CMD2, info->IER);
|
|
}
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
}
|
|
|
|
static void rs_start(struct tty_struct *tty)
|
|
{
|
|
struct esp_struct *info = tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_start"))
|
|
return;
|
|
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
if (info->xmit_cnt && info->xmit_buf && !(info->IER & UART_IER_THRI)) {
|
|
info->IER |= UART_IER_THRI;
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
|
|
serial_out(info, UART_ESI_CMD2, info->IER);
|
|
}
|
|
spin_unlock_irqrestore(&info->lock, 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
|
|
* -----------------------------------------------------------------------
|
|
*/
|
|
|
|
static DEFINE_SPINLOCK(pio_lock);
|
|
|
|
static inline struct esp_pio_buffer *get_pio_buffer(void)
|
|
{
|
|
struct esp_pio_buffer *buf;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&pio_lock, flags);
|
|
if (free_pio_buf) {
|
|
buf = free_pio_buf;
|
|
free_pio_buf = buf->next;
|
|
} else {
|
|
buf = kmalloc(sizeof(struct esp_pio_buffer), GFP_ATOMIC);
|
|
}
|
|
spin_unlock_irqrestore(&pio_lock, flags);
|
|
return buf;
|
|
}
|
|
|
|
static inline void release_pio_buffer(struct esp_pio_buffer *buf)
|
|
{
|
|
unsigned long flags;
|
|
spin_lock_irqsave(&pio_lock, flags);
|
|
buf->next = free_pio_buf;
|
|
free_pio_buf = buf;
|
|
spin_unlock_irqrestore(&pio_lock, flags);
|
|
}
|
|
|
|
static inline void receive_chars_pio(struct esp_struct *info, int num_bytes)
|
|
{
|
|
struct tty_struct *tty = info->port.tty;
|
|
int i;
|
|
struct esp_pio_buffer *pio_buf;
|
|
struct esp_pio_buffer *err_buf;
|
|
unsigned char status_mask;
|
|
|
|
pio_buf = get_pio_buffer();
|
|
|
|
if (!pio_buf)
|
|
return;
|
|
|
|
err_buf = get_pio_buffer();
|
|
|
|
if (!err_buf) {
|
|
release_pio_buffer(pio_buf);
|
|
return;
|
|
}
|
|
|
|
status_mask = (info->read_status_mask >> 2) & 0x07;
|
|
|
|
for (i = 0; i < num_bytes - 1; i += 2) {
|
|
*((unsigned short *)(pio_buf->data + i)) =
|
|
inw(info->io_port + UART_ESI_RX);
|
|
err_buf->data[i] = serial_in(info, UART_ESI_RWS);
|
|
err_buf->data[i + 1] = (err_buf->data[i] >> 3) & status_mask;
|
|
err_buf->data[i] &= status_mask;
|
|
}
|
|
|
|
if (num_bytes & 0x0001) {
|
|
pio_buf->data[num_bytes - 1] = serial_in(info, UART_ESI_RX);
|
|
err_buf->data[num_bytes - 1] =
|
|
(serial_in(info, UART_ESI_RWS) >> 3) & status_mask;
|
|
}
|
|
|
|
/* make sure everything is still ok since interrupts were enabled */
|
|
tty = info->port.tty;
|
|
|
|
if (!tty) {
|
|
release_pio_buffer(pio_buf);
|
|
release_pio_buffer(err_buf);
|
|
info->stat_flags &= ~ESP_STAT_RX_TIMEOUT;
|
|
return;
|
|
}
|
|
|
|
status_mask = (info->ignore_status_mask >> 2) & 0x07;
|
|
|
|
for (i = 0; i < num_bytes; i++) {
|
|
if (!(err_buf->data[i] & status_mask)) {
|
|
int flag = 0;
|
|
|
|
if (err_buf->data[i] & 0x04) {
|
|
flag = TTY_BREAK;
|
|
if (info->port.flags & ASYNC_SAK)
|
|
do_SAK(tty);
|
|
} else if (err_buf->data[i] & 0x02)
|
|
flag = TTY_FRAME;
|
|
else if (err_buf->data[i] & 0x01)
|
|
flag = TTY_PARITY;
|
|
tty_insert_flip_char(tty, pio_buf->data[i], flag);
|
|
}
|
|
}
|
|
|
|
tty_schedule_flip(tty);
|
|
|
|
info->stat_flags &= ~ESP_STAT_RX_TIMEOUT;
|
|
release_pio_buffer(pio_buf);
|
|
release_pio_buffer(err_buf);
|
|
}
|
|
|
|
static void program_isa_dma(int dma, int dir, unsigned long addr, int len)
|
|
{
|
|
unsigned long flags;
|
|
|
|
flags = claim_dma_lock();
|
|
disable_dma(dma);
|
|
clear_dma_ff(dma);
|
|
set_dma_mode(dma, dir);
|
|
set_dma_addr(dma, addr);
|
|
set_dma_count(dma, len);
|
|
enable_dma(dma);
|
|
release_dma_lock(flags);
|
|
}
|
|
|
|
static void receive_chars_dma(struct esp_struct *info, int num_bytes)
|
|
{
|
|
info->stat_flags &= ~ESP_STAT_RX_TIMEOUT;
|
|
dma_bytes = num_bytes;
|
|
info->stat_flags |= ESP_STAT_DMA_RX;
|
|
|
|
program_isa_dma(dma, DMA_MODE_READ, isa_virt_to_bus(dma_buffer),
|
|
dma_bytes);
|
|
serial_out(info, UART_ESI_CMD1, ESI_START_DMA_RX);
|
|
}
|
|
|
|
static inline void receive_chars_dma_done(struct esp_struct *info,
|
|
int status)
|
|
{
|
|
struct tty_struct *tty = info->port.tty;
|
|
int num_bytes;
|
|
unsigned long flags;
|
|
|
|
flags = claim_dma_lock();
|
|
disable_dma(dma);
|
|
clear_dma_ff(dma);
|
|
|
|
info->stat_flags &= ~ESP_STAT_DMA_RX;
|
|
num_bytes = dma_bytes - get_dma_residue(dma);
|
|
release_dma_lock(flags);
|
|
|
|
info->icount.rx += num_bytes;
|
|
|
|
if (num_bytes > 0) {
|
|
tty_insert_flip_string(tty, dma_buffer, num_bytes - 1);
|
|
|
|
status &= (0x1c & info->read_status_mask);
|
|
|
|
/* Is the status significant or do we throw the last byte ? */
|
|
if (!(status & info->ignore_status_mask)) {
|
|
int statflag = 0;
|
|
|
|
if (status & 0x10) {
|
|
statflag = TTY_BREAK;
|
|
(info->icount.brk)++;
|
|
if (info->port.flags & ASYNC_SAK)
|
|
do_SAK(tty);
|
|
} else if (status & 0x08) {
|
|
statflag = TTY_FRAME;
|
|
info->icount.frame++;
|
|
} else if (status & 0x04) {
|
|
statflag = TTY_PARITY;
|
|
info->icount.parity++;
|
|
}
|
|
tty_insert_flip_char(tty, dma_buffer[num_bytes - 1],
|
|
statflag);
|
|
}
|
|
tty_schedule_flip(tty);
|
|
}
|
|
|
|
if (dma_bytes != num_bytes) {
|
|
num_bytes = dma_bytes - num_bytes;
|
|
dma_bytes = 0;
|
|
receive_chars_dma(info, num_bytes);
|
|
} else
|
|
dma_bytes = 0;
|
|
}
|
|
|
|
/* Caller must hold info->lock */
|
|
|
|
static inline void transmit_chars_pio(struct esp_struct *info,
|
|
int space_avail)
|
|
{
|
|
int i;
|
|
struct esp_pio_buffer *pio_buf;
|
|
|
|
pio_buf = get_pio_buffer();
|
|
|
|
if (!pio_buf)
|
|
return;
|
|
|
|
while (space_avail && info->xmit_cnt) {
|
|
if (info->xmit_tail + space_avail <= ESP_XMIT_SIZE) {
|
|
memcpy(pio_buf->data,
|
|
&(info->xmit_buf[info->xmit_tail]),
|
|
space_avail);
|
|
} else {
|
|
i = ESP_XMIT_SIZE - info->xmit_tail;
|
|
memcpy(pio_buf->data,
|
|
&(info->xmit_buf[info->xmit_tail]), i);
|
|
memcpy(&(pio_buf->data[i]), info->xmit_buf,
|
|
space_avail - i);
|
|
}
|
|
|
|
info->xmit_cnt -= space_avail;
|
|
info->xmit_tail = (info->xmit_tail + space_avail) &
|
|
(ESP_XMIT_SIZE - 1);
|
|
|
|
for (i = 0; i < space_avail - 1; i += 2) {
|
|
outw(*((unsigned short *)(pio_buf->data + i)),
|
|
info->io_port + UART_ESI_TX);
|
|
}
|
|
|
|
if (space_avail & 0x0001)
|
|
serial_out(info, UART_ESI_TX,
|
|
pio_buf->data[space_avail - 1]);
|
|
|
|
if (info->xmit_cnt) {
|
|
serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
|
|
serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
|
|
space_avail = serial_in(info, UART_ESI_STAT1) << 8;
|
|
space_avail |= serial_in(info, UART_ESI_STAT2);
|
|
|
|
if (space_avail > info->xmit_cnt)
|
|
space_avail = info->xmit_cnt;
|
|
}
|
|
}
|
|
|
|
if (info->xmit_cnt < WAKEUP_CHARS) {
|
|
if (info->port.tty)
|
|
tty_wakeup(info->port.tty);
|
|
|
|
#ifdef SERIAL_DEBUG_INTR
|
|
printk("THRE...");
|
|
#endif
|
|
|
|
if (info->xmit_cnt <= 0) {
|
|
info->IER &= ~UART_IER_THRI;
|
|
serial_out(info, UART_ESI_CMD1,
|
|
ESI_SET_SRV_MASK);
|
|
serial_out(info, UART_ESI_CMD2, info->IER);
|
|
}
|
|
}
|
|
|
|
release_pio_buffer(pio_buf);
|
|
}
|
|
|
|
/* Caller must hold info->lock */
|
|
static inline void transmit_chars_dma(struct esp_struct *info, int num_bytes)
|
|
{
|
|
dma_bytes = num_bytes;
|
|
|
|
if (info->xmit_tail + dma_bytes <= ESP_XMIT_SIZE) {
|
|
memcpy(dma_buffer, &(info->xmit_buf[info->xmit_tail]),
|
|
dma_bytes);
|
|
} else {
|
|
int i = ESP_XMIT_SIZE - info->xmit_tail;
|
|
memcpy(dma_buffer, &(info->xmit_buf[info->xmit_tail]),
|
|
i);
|
|
memcpy(&(dma_buffer[i]), info->xmit_buf, dma_bytes - i);
|
|
}
|
|
|
|
info->xmit_cnt -= dma_bytes;
|
|
info->xmit_tail = (info->xmit_tail + dma_bytes) & (ESP_XMIT_SIZE - 1);
|
|
|
|
if (info->xmit_cnt < WAKEUP_CHARS) {
|
|
if (info->port.tty)
|
|
tty_wakeup(info->port.tty);
|
|
|
|
#ifdef SERIAL_DEBUG_INTR
|
|
printk("THRE...");
|
|
#endif
|
|
|
|
if (info->xmit_cnt <= 0) {
|
|
info->IER &= ~UART_IER_THRI;
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
|
|
serial_out(info, UART_ESI_CMD2, info->IER);
|
|
}
|
|
}
|
|
|
|
info->stat_flags |= ESP_STAT_DMA_TX;
|
|
|
|
program_isa_dma(dma, DMA_MODE_WRITE, isa_virt_to_bus(dma_buffer),
|
|
dma_bytes);
|
|
serial_out(info, UART_ESI_CMD1, ESI_START_DMA_TX);
|
|
}
|
|
|
|
static inline void transmit_chars_dma_done(struct esp_struct *info)
|
|
{
|
|
int num_bytes;
|
|
unsigned long flags;
|
|
|
|
flags = claim_dma_lock();
|
|
disable_dma(dma);
|
|
clear_dma_ff(dma);
|
|
|
|
num_bytes = dma_bytes - get_dma_residue(dma);
|
|
info->icount.tx += dma_bytes;
|
|
release_dma_lock(flags);
|
|
|
|
if (dma_bytes != num_bytes) {
|
|
dma_bytes -= num_bytes;
|
|
memmove(dma_buffer, dma_buffer + num_bytes, dma_bytes);
|
|
|
|
program_isa_dma(dma, DMA_MODE_WRITE,
|
|
isa_virt_to_bus(dma_buffer), dma_bytes);
|
|
|
|
serial_out(info, UART_ESI_CMD1, ESI_START_DMA_TX);
|
|
} else {
|
|
dma_bytes = 0;
|
|
info->stat_flags &= ~ESP_STAT_DMA_TX;
|
|
}
|
|
}
|
|
|
|
static void check_modem_status(struct esp_struct *info)
|
|
{
|
|
int status;
|
|
|
|
serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
|
|
status = serial_in(info, UART_ESI_STAT2);
|
|
|
|
if (status & UART_MSR_ANY_DELTA) {
|
|
/* update input line counters */
|
|
if (status & UART_MSR_TERI)
|
|
info->icount.rng++;
|
|
if (status & UART_MSR_DDSR)
|
|
info->icount.dsr++;
|
|
if (status & UART_MSR_DDCD)
|
|
info->icount.dcd++;
|
|
if (status & UART_MSR_DCTS)
|
|
info->icount.cts++;
|
|
wake_up_interruptible(&info->delta_msr_wait);
|
|
}
|
|
|
|
if ((info->port.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->port.open_wait);
|
|
else {
|
|
#ifdef SERIAL_DEBUG_OPEN
|
|
printk("scheduling hangup...");
|
|
#endif
|
|
tty_hangup(info->port.tty);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This is the serial driver's interrupt routine
|
|
*/
|
|
static irqreturn_t rs_interrupt_single(int irq, void *dev_id)
|
|
{
|
|
struct esp_struct *info;
|
|
unsigned err_status;
|
|
unsigned int scratch;
|
|
|
|
#ifdef SERIAL_DEBUG_INTR
|
|
printk("rs_interrupt_single(%d)...", irq);
|
|
#endif
|
|
info = (struct esp_struct *)dev_id;
|
|
err_status = 0;
|
|
scratch = serial_in(info, UART_ESI_SID);
|
|
|
|
spin_lock(&info->lock);
|
|
|
|
if (!info->port.tty) {
|
|
spin_unlock(&info->lock);
|
|
return IRQ_NONE;
|
|
}
|
|
|
|
if (scratch & 0x04) { /* error */
|
|
serial_out(info, UART_ESI_CMD1, ESI_GET_ERR_STAT);
|
|
err_status = serial_in(info, UART_ESI_STAT1);
|
|
serial_in(info, UART_ESI_STAT2);
|
|
|
|
if (err_status & 0x01)
|
|
info->stat_flags |= ESP_STAT_RX_TIMEOUT;
|
|
|
|
if (err_status & 0x20) /* UART status */
|
|
check_modem_status(info);
|
|
|
|
if (err_status & 0x80) /* Start break */
|
|
wake_up_interruptible(&info->break_wait);
|
|
}
|
|
|
|
if ((scratch & 0x88) || /* DMA completed or timed out */
|
|
(err_status & 0x1c) /* receive error */) {
|
|
if (info->stat_flags & ESP_STAT_DMA_RX)
|
|
receive_chars_dma_done(info, err_status);
|
|
else if (info->stat_flags & ESP_STAT_DMA_TX)
|
|
transmit_chars_dma_done(info);
|
|
}
|
|
|
|
if (!(info->stat_flags & (ESP_STAT_DMA_RX | ESP_STAT_DMA_TX)) &&
|
|
((scratch & 0x01) || (info->stat_flags & ESP_STAT_RX_TIMEOUT)) &&
|
|
(info->IER & UART_IER_RDI)) {
|
|
int num_bytes;
|
|
|
|
serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
|
|
serial_out(info, UART_ESI_CMD1, ESI_GET_RX_AVAIL);
|
|
num_bytes = serial_in(info, UART_ESI_STAT1) << 8;
|
|
num_bytes |= serial_in(info, UART_ESI_STAT2);
|
|
|
|
num_bytes = tty_buffer_request_room(info->port.tty, num_bytes);
|
|
|
|
if (num_bytes) {
|
|
if (dma_bytes ||
|
|
(info->stat_flags & ESP_STAT_USE_PIO) ||
|
|
(num_bytes <= info->config.pio_threshold))
|
|
receive_chars_pio(info, num_bytes);
|
|
else
|
|
receive_chars_dma(info, num_bytes);
|
|
}
|
|
}
|
|
|
|
if (!(info->stat_flags & (ESP_STAT_DMA_RX | ESP_STAT_DMA_TX)) &&
|
|
(scratch & 0x02) && (info->IER & UART_IER_THRI)) {
|
|
if ((info->xmit_cnt <= 0) || info->port.tty->stopped) {
|
|
info->IER &= ~UART_IER_THRI;
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
|
|
serial_out(info, UART_ESI_CMD2, info->IER);
|
|
} else {
|
|
int num_bytes;
|
|
|
|
serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
|
|
serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
|
|
num_bytes = serial_in(info, UART_ESI_STAT1) << 8;
|
|
num_bytes |= serial_in(info, UART_ESI_STAT2);
|
|
|
|
if (num_bytes > info->xmit_cnt)
|
|
num_bytes = info->xmit_cnt;
|
|
|
|
if (num_bytes) {
|
|
if (dma_bytes ||
|
|
(info->stat_flags & ESP_STAT_USE_PIO) ||
|
|
(num_bytes <= info->config.pio_threshold))
|
|
transmit_chars_pio(info, num_bytes);
|
|
else
|
|
transmit_chars_dma(info, num_bytes);
|
|
}
|
|
}
|
|
}
|
|
|
|
info->last_active = jiffies;
|
|
|
|
#ifdef SERIAL_DEBUG_INTR
|
|
printk("end.\n");
|
|
#endif
|
|
spin_unlock(&info->lock);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/*
|
|
* -------------------------------------------------------------------
|
|
* Here ends the serial interrupt routines.
|
|
* -------------------------------------------------------------------
|
|
*/
|
|
|
|
/*
|
|
* ---------------------------------------------------------------
|
|
* 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.
|
|
*
|
|
* Caller should hold lock
|
|
* ---------------------------------------------------------------
|
|
*/
|
|
|
|
static void esp_basic_init(struct esp_struct *info)
|
|
{
|
|
/* put ESPC in enhanced mode */
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_MODE);
|
|
|
|
if (info->stat_flags & ESP_STAT_NEVER_DMA)
|
|
serial_out(info, UART_ESI_CMD2, 0x01);
|
|
else
|
|
serial_out(info, UART_ESI_CMD2, 0x31);
|
|
|
|
/* disable interrupts for now */
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
|
|
serial_out(info, UART_ESI_CMD2, 0x00);
|
|
|
|
/* set interrupt and DMA channel */
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_IRQ);
|
|
|
|
if (info->stat_flags & ESP_STAT_NEVER_DMA)
|
|
serial_out(info, UART_ESI_CMD2, 0x01);
|
|
else
|
|
serial_out(info, UART_ESI_CMD2, (dma << 4) | 0x01);
|
|
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_ENH_IRQ);
|
|
|
|
if (info->line % 8) /* secondary port */
|
|
serial_out(info, UART_ESI_CMD2, 0x0d); /* shared */
|
|
else if (info->irq == 9)
|
|
serial_out(info, UART_ESI_CMD2, 0x02);
|
|
else
|
|
serial_out(info, UART_ESI_CMD2, info->irq);
|
|
|
|
/* set error status mask (check this) */
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_ERR_MASK);
|
|
|
|
if (info->stat_flags & ESP_STAT_NEVER_DMA)
|
|
serial_out(info, UART_ESI_CMD2, 0xa1);
|
|
else
|
|
serial_out(info, UART_ESI_CMD2, 0xbd);
|
|
|
|
serial_out(info, UART_ESI_CMD2, 0x00);
|
|
|
|
/* set DMA timeout */
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_DMA_TMOUT);
|
|
serial_out(info, UART_ESI_CMD2, 0xff);
|
|
|
|
/* set FIFO trigger levels */
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_TRIGGER);
|
|
serial_out(info, UART_ESI_CMD2, info->config.rx_trigger >> 8);
|
|
serial_out(info, UART_ESI_CMD2, info->config.rx_trigger);
|
|
serial_out(info, UART_ESI_CMD2, info->config.tx_trigger >> 8);
|
|
serial_out(info, UART_ESI_CMD2, info->config.tx_trigger);
|
|
|
|
/* Set clock scaling and wait states */
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_PRESCALAR);
|
|
serial_out(info, UART_ESI_CMD2, 0x04 | ESPC_SCALE);
|
|
|
|
/* set reinterrupt pacing */
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_REINTR);
|
|
serial_out(info, UART_ESI_CMD2, 0xff);
|
|
}
|
|
|
|
static int startup(struct esp_struct *info)
|
|
{
|
|
unsigned long flags;
|
|
int retval = 0;
|
|
unsigned int num_chars;
|
|
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
|
|
if (info->port.flags & ASYNC_INITIALIZED)
|
|
goto out;
|
|
|
|
if (!info->xmit_buf) {
|
|
info->xmit_buf = (unsigned char *)get_zeroed_page(GFP_ATOMIC);
|
|
retval = -ENOMEM;
|
|
if (!info->xmit_buf)
|
|
goto out;
|
|
}
|
|
|
|
#ifdef SERIAL_DEBUG_OPEN
|
|
printk(KERN_DEBUG "starting up ttys%d (irq %d)...",
|
|
info->line, info->irq);
|
|
#endif
|
|
|
|
/* Flush the RX buffer. Using the ESI flush command may cause */
|
|
/* wild interrupts, so read all the data instead. */
|
|
|
|
serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
|
|
serial_out(info, UART_ESI_CMD1, ESI_GET_RX_AVAIL);
|
|
num_chars = serial_in(info, UART_ESI_STAT1) << 8;
|
|
num_chars |= serial_in(info, UART_ESI_STAT2);
|
|
|
|
while (num_chars > 1) {
|
|
inw(info->io_port + UART_ESI_RX);
|
|
num_chars -= 2;
|
|
}
|
|
|
|
if (num_chars)
|
|
serial_in(info, UART_ESI_RX);
|
|
|
|
/* set receive character timeout */
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
|
|
serial_out(info, UART_ESI_CMD2, info->config.rx_timeout);
|
|
|
|
/* clear all flags except the "never DMA" flag */
|
|
info->stat_flags &= ESP_STAT_NEVER_DMA;
|
|
|
|
if (info->stat_flags & ESP_STAT_NEVER_DMA)
|
|
info->stat_flags |= ESP_STAT_USE_PIO;
|
|
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
|
|
/*
|
|
* Allocate the IRQ
|
|
*/
|
|
|
|
retval = request_irq(info->irq, rs_interrupt_single, IRQF_SHARED,
|
|
"esp serial", info);
|
|
|
|
if (retval) {
|
|
if (capable(CAP_SYS_ADMIN)) {
|
|
if (info->port.tty)
|
|
set_bit(TTY_IO_ERROR,
|
|
&info->port.tty->flags);
|
|
retval = 0;
|
|
}
|
|
goto out_unlocked;
|
|
}
|
|
|
|
if (!(info->stat_flags & ESP_STAT_USE_PIO) && !dma_buffer) {
|
|
dma_buffer = (char *)__get_dma_pages(
|
|
GFP_KERNEL, get_order(DMA_BUFFER_SZ));
|
|
|
|
/* use PIO mode if DMA buf/chan cannot be allocated */
|
|
if (!dma_buffer)
|
|
info->stat_flags |= ESP_STAT_USE_PIO;
|
|
else if (request_dma(dma, "esp serial")) {
|
|
free_pages((unsigned long)dma_buffer,
|
|
get_order(DMA_BUFFER_SZ));
|
|
dma_buffer = NULL;
|
|
info->stat_flags |= ESP_STAT_USE_PIO;
|
|
}
|
|
|
|
}
|
|
|
|
info->MCR = UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2;
|
|
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
|
|
serial_out(info, UART_ESI_CMD2, UART_MCR);
|
|
serial_out(info, UART_ESI_CMD2, info->MCR);
|
|
|
|
/*
|
|
* Finally, enable interrupts
|
|
*/
|
|
/* info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI; */
|
|
info->IER = UART_IER_RLSI | UART_IER_RDI | UART_IER_DMA_TMOUT |
|
|
UART_IER_DMA_TC;
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
|
|
serial_out(info, UART_ESI_CMD2, info->IER);
|
|
|
|
if (info->port.tty)
|
|
clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
|
|
info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
|
|
/*
|
|
* Set up the tty->alt_speed kludge
|
|
*/
|
|
if (info->port.tty) {
|
|
if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
|
|
info->port.tty->alt_speed = 57600;
|
|
if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
|
|
info->port.tty->alt_speed = 115200;
|
|
if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
|
|
info->port.tty->alt_speed = 230400;
|
|
if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
|
|
info->port.tty->alt_speed = 460800;
|
|
}
|
|
|
|
/*
|
|
* set the speed of the serial port
|
|
*/
|
|
change_speed(info);
|
|
info->port.flags |= ASYNC_INITIALIZED;
|
|
return 0;
|
|
|
|
out:
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
out_unlocked:
|
|
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 esp_struct *info)
|
|
{
|
|
unsigned long flags, f;
|
|
|
|
if (!(info->port.flags & ASYNC_INITIALIZED))
|
|
return;
|
|
|
|
#ifdef SERIAL_DEBUG_OPEN
|
|
printk("Shutting down serial port %d (irq %d)....", info->line,
|
|
info->irq);
|
|
#endif
|
|
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
/*
|
|
* 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);
|
|
wake_up_interruptible(&info->break_wait);
|
|
|
|
/* stop a DMA transfer on the port being closed */
|
|
/* DMA lock is higher priority always */
|
|
if (info->stat_flags & (ESP_STAT_DMA_RX | ESP_STAT_DMA_TX)) {
|
|
f = claim_dma_lock();
|
|
disable_dma(dma);
|
|
clear_dma_ff(dma);
|
|
release_dma_lock(f);
|
|
|
|
dma_bytes = 0;
|
|
}
|
|
|
|
/*
|
|
* Free the IRQ
|
|
*/
|
|
free_irq(info->irq, info);
|
|
|
|
if (dma_buffer) {
|
|
struct esp_struct *current_port = ports;
|
|
|
|
while (current_port) {
|
|
if ((current_port != info) &&
|
|
(current_port->port.flags & ASYNC_INITIALIZED))
|
|
break;
|
|
|
|
current_port = current_port->next_port;
|
|
}
|
|
|
|
if (!current_port) {
|
|
free_dma(dma);
|
|
free_pages((unsigned long)dma_buffer,
|
|
get_order(DMA_BUFFER_SZ));
|
|
dma_buffer = NULL;
|
|
}
|
|
}
|
|
|
|
if (info->xmit_buf) {
|
|
free_page((unsigned long) info->xmit_buf);
|
|
info->xmit_buf = NULL;
|
|
}
|
|
|
|
info->IER = 0;
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
|
|
serial_out(info, UART_ESI_CMD2, 0x00);
|
|
|
|
if (!info->port.tty || (info->port.tty->termios->c_cflag & HUPCL))
|
|
info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS);
|
|
|
|
info->MCR &= ~UART_MCR_OUT2;
|
|
serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
|
|
serial_out(info, UART_ESI_CMD2, UART_MCR);
|
|
serial_out(info, UART_ESI_CMD2, info->MCR);
|
|
|
|
if (info->port.tty)
|
|
set_bit(TTY_IO_ERROR, &info->port.tty->flags);
|
|
|
|
info->port.flags &= ~ASYNC_INITIALIZED;
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
}
|
|
|
|
/*
|
|
* 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 esp_struct *info)
|
|
{
|
|
unsigned short port;
|
|
int quot = 0;
|
|
unsigned cflag, cval;
|
|
int baud, bits;
|
|
unsigned char flow1 = 0, flow2 = 0;
|
|
unsigned long flags;
|
|
|
|
if (!info->port.tty || !info->port.tty->termios)
|
|
return;
|
|
cflag = info->port.tty->termios->c_cflag;
|
|
port = info->io_port;
|
|
|
|
/* 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;
|
|
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
|
|
baud = tty_get_baud_rate(info->port.tty);
|
|
if (baud == 38400 &&
|
|
((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
|
|
quot = info->custom_divisor;
|
|
else {
|
|
if (baud == 134) /* Special case since 134 is really 134.5 */
|
|
quot = (2*BASE_BAUD / 269);
|
|
else if (baud)
|
|
quot = BASE_BAUD / baud;
|
|
}
|
|
/* If the quotient is ever zero, default to 9600 bps */
|
|
if (!quot)
|
|
quot = BASE_BAUD / 9600;
|
|
|
|
if (baud) {
|
|
/* Actual rate */
|
|
baud = BASE_BAUD/quot;
|
|
tty_encode_baud_rate(info->port.tty, baud, baud);
|
|
}
|
|
info->timeout = ((1024 * HZ * bits * quot) / BASE_BAUD) + (HZ / 50);
|
|
|
|
/* CTS flow control flag and modem status interrupts */
|
|
/* info->IER &= ~UART_IER_MSI; */
|
|
if (cflag & CRTSCTS) {
|
|
info->port.flags |= ASYNC_CTS_FLOW;
|
|
/* info->IER |= UART_IER_MSI; */
|
|
flow1 = 0x04;
|
|
flow2 = 0x10;
|
|
} else
|
|
info->port.flags &= ~ASYNC_CTS_FLOW;
|
|
if (cflag & CLOCAL)
|
|
info->port.flags &= ~ASYNC_CHECK_CD;
|
|
else
|
|
info->port.flags |= ASYNC_CHECK_CD;
|
|
|
|
/*
|
|
* Set up parity check flag
|
|
*/
|
|
info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
|
|
if (I_INPCK(info->port.tty))
|
|
info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
|
|
if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
|
|
info->read_status_mask |= UART_LSR_BI;
|
|
|
|
info->ignore_status_mask = 0;
|
|
#if 0
|
|
/* This should be safe, but for some broken bits of hardware... */
|
|
if (I_IGNPAR(info->port.tty)) {
|
|
info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
|
|
info->read_status_mask |= UART_LSR_PE | UART_LSR_FE;
|
|
}
|
|
#endif
|
|
if (I_IGNBRK(info->port.tty)) {
|
|
info->ignore_status_mask |= UART_LSR_BI;
|
|
info->read_status_mask |= UART_LSR_BI;
|
|
/*
|
|
* If we're ignore parity and break indicators, ignore
|
|
* overruns too. (For real raw support).
|
|
*/
|
|
if (I_IGNPAR(info->port.tty)) {
|
|
info->ignore_status_mask |= UART_LSR_OE | \
|
|
UART_LSR_PE | UART_LSR_FE;
|
|
info->read_status_mask |= UART_LSR_OE | \
|
|
UART_LSR_PE | UART_LSR_FE;
|
|
}
|
|
}
|
|
|
|
if (I_IXOFF(info->port.tty))
|
|
flow1 |= 0x81;
|
|
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
/* set baud */
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_BAUD);
|
|
serial_out(info, UART_ESI_CMD2, quot >> 8);
|
|
serial_out(info, UART_ESI_CMD2, quot & 0xff);
|
|
|
|
/* set data bits, parity, etc. */
|
|
serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
|
|
serial_out(info, UART_ESI_CMD2, UART_LCR);
|
|
serial_out(info, UART_ESI_CMD2, cval);
|
|
|
|
/* Enable flow control */
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_CNTL);
|
|
serial_out(info, UART_ESI_CMD2, flow1);
|
|
serial_out(info, UART_ESI_CMD2, flow2);
|
|
|
|
/* set flow control characters (XON/XOFF only) */
|
|
if (I_IXOFF(info->port.tty)) {
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_CHARS);
|
|
serial_out(info, UART_ESI_CMD2, START_CHAR(info->port.tty));
|
|
serial_out(info, UART_ESI_CMD2, STOP_CHAR(info->port.tty));
|
|
serial_out(info, UART_ESI_CMD2, 0x10);
|
|
serial_out(info, UART_ESI_CMD2, 0x21);
|
|
switch (cflag & CSIZE) {
|
|
case CS5:
|
|
serial_out(info, UART_ESI_CMD2, 0x1f);
|
|
break;
|
|
case CS6:
|
|
serial_out(info, UART_ESI_CMD2, 0x3f);
|
|
break;
|
|
case CS7:
|
|
case CS8:
|
|
serial_out(info, UART_ESI_CMD2, 0x7f);
|
|
break;
|
|
default:
|
|
serial_out(info, UART_ESI_CMD2, 0xff);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Set high/low water */
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_LVL);
|
|
serial_out(info, UART_ESI_CMD2, info->config.flow_off >> 8);
|
|
serial_out(info, UART_ESI_CMD2, info->config.flow_off);
|
|
serial_out(info, UART_ESI_CMD2, info->config.flow_on >> 8);
|
|
serial_out(info, UART_ESI_CMD2, info->config.flow_on);
|
|
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
}
|
|
|
|
static int rs_put_char(struct tty_struct *tty, unsigned char ch)
|
|
{
|
|
struct esp_struct *info = tty->driver_data;
|
|
unsigned long flags;
|
|
int ret = 0;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_put_char"))
|
|
return 0;
|
|
|
|
if (!info->xmit_buf)
|
|
return 0;
|
|
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
if (info->xmit_cnt < ESP_XMIT_SIZE - 1) {
|
|
info->xmit_buf[info->xmit_head++] = ch;
|
|
info->xmit_head &= ESP_XMIT_SIZE-1;
|
|
info->xmit_cnt++;
|
|
ret = 1;
|
|
}
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
return ret;
|
|
}
|
|
|
|
static void rs_flush_chars(struct tty_struct *tty)
|
|
{
|
|
struct esp_struct *info = tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
|
|
return;
|
|
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
|
|
if (info->xmit_cnt <= 0 || tty->stopped || !info->xmit_buf)
|
|
goto out;
|
|
|
|
if (!(info->IER & UART_IER_THRI)) {
|
|
info->IER |= UART_IER_THRI;
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
|
|
serial_out(info, UART_ESI_CMD2, info->IER);
|
|
}
|
|
out:
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
}
|
|
|
|
static int rs_write(struct tty_struct *tty,
|
|
const unsigned char *buf, int count)
|
|
{
|
|
int c, t, ret = 0;
|
|
struct esp_struct *info = tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_write"))
|
|
return 0;
|
|
|
|
if (!info->xmit_buf)
|
|
return 0;
|
|
|
|
while (1) {
|
|
/* Thanks to R. Wolff for suggesting how to do this with */
|
|
/* interrupts enabled */
|
|
|
|
c = count;
|
|
t = ESP_XMIT_SIZE - info->xmit_cnt - 1;
|
|
|
|
if (t < c)
|
|
c = t;
|
|
|
|
t = ESP_XMIT_SIZE - info->xmit_head;
|
|
|
|
if (t < c)
|
|
c = t;
|
|
|
|
if (c <= 0)
|
|
break;
|
|
|
|
memcpy(info->xmit_buf + info->xmit_head, buf, c);
|
|
|
|
info->xmit_head = (info->xmit_head + c) & (ESP_XMIT_SIZE-1);
|
|
info->xmit_cnt += c;
|
|
buf += c;
|
|
count -= c;
|
|
ret += c;
|
|
}
|
|
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
|
|
if (info->xmit_cnt && !tty->stopped && !(info->IER & UART_IER_THRI)) {
|
|
info->IER |= UART_IER_THRI;
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
|
|
serial_out(info, UART_ESI_CMD2, info->IER);
|
|
}
|
|
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
return ret;
|
|
}
|
|
|
|
static int rs_write_room(struct tty_struct *tty)
|
|
{
|
|
struct esp_struct *info = tty->driver_data;
|
|
int ret;
|
|
unsigned long flags;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_write_room"))
|
|
return 0;
|
|
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
|
|
ret = ESP_XMIT_SIZE - info->xmit_cnt - 1;
|
|
if (ret < 0)
|
|
ret = 0;
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
return ret;
|
|
}
|
|
|
|
static int rs_chars_in_buffer(struct tty_struct *tty)
|
|
{
|
|
struct esp_struct *info = tty->driver_data;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
|
|
return 0;
|
|
return info->xmit_cnt;
|
|
}
|
|
|
|
static void rs_flush_buffer(struct tty_struct *tty)
|
|
{
|
|
struct esp_struct *info = tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
|
|
return;
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
tty_wakeup(tty);
|
|
}
|
|
|
|
/*
|
|
* ------------------------------------------------------------
|
|
* 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 esp_struct *info = tty->driver_data;
|
|
unsigned long flags;
|
|
#ifdef SERIAL_DEBUG_THROTTLE
|
|
char buf[64];
|
|
|
|
printk("throttle %s: %d....\n", tty_name(tty, buf),
|
|
tty_chars_in_buffer(tty));
|
|
#endif
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_throttle"))
|
|
return;
|
|
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
info->IER &= ~UART_IER_RDI;
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
|
|
serial_out(info, UART_ESI_CMD2, info->IER);
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
|
|
serial_out(info, UART_ESI_CMD2, 0x00);
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
}
|
|
|
|
static void rs_unthrottle(struct tty_struct *tty)
|
|
{
|
|
struct esp_struct *info = tty->driver_data;
|
|
unsigned long flags;
|
|
#ifdef SERIAL_DEBUG_THROTTLE
|
|
char buf[64];
|
|
|
|
printk(KERN_DEBUG "unthrottle %s: %d....\n", tty_name(tty, buf),
|
|
tty_chars_in_buffer(tty));
|
|
#endif
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
|
|
return;
|
|
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
info->IER |= UART_IER_RDI;
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
|
|
serial_out(info, UART_ESI_CMD2, info->IER);
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
|
|
serial_out(info, UART_ESI_CMD2, info->config.rx_timeout);
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
}
|
|
|
|
/*
|
|
* ------------------------------------------------------------
|
|
* rs_ioctl() and friends
|
|
* ------------------------------------------------------------
|
|
*/
|
|
|
|
static int get_serial_info(struct esp_struct *info,
|
|
struct serial_struct __user *retinfo)
|
|
{
|
|
struct serial_struct tmp;
|
|
|
|
lock_kernel();
|
|
memset(&tmp, 0, sizeof(tmp));
|
|
tmp.type = PORT_16550A;
|
|
tmp.line = info->line;
|
|
tmp.port = info->io_port;
|
|
tmp.irq = info->irq;
|
|
tmp.flags = info->port.flags;
|
|
tmp.xmit_fifo_size = 1024;
|
|
tmp.baud_base = BASE_BAUD;
|
|
tmp.close_delay = info->close_delay;
|
|
tmp.closing_wait = info->closing_wait;
|
|
tmp.custom_divisor = info->custom_divisor;
|
|
tmp.hub6 = 0;
|
|
unlock_kernel();
|
|
if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
|
|
static int get_esp_config(struct esp_struct *info,
|
|
struct hayes_esp_config __user *retinfo)
|
|
{
|
|
struct hayes_esp_config tmp;
|
|
|
|
if (!retinfo)
|
|
return -EFAULT;
|
|
|
|
memset(&tmp, 0, sizeof(tmp));
|
|
lock_kernel();
|
|
tmp.rx_timeout = info->config.rx_timeout;
|
|
tmp.rx_trigger = info->config.rx_trigger;
|
|
tmp.tx_trigger = info->config.tx_trigger;
|
|
tmp.flow_off = info->config.flow_off;
|
|
tmp.flow_on = info->config.flow_on;
|
|
tmp.pio_threshold = info->config.pio_threshold;
|
|
tmp.dma_channel = (info->stat_flags & ESP_STAT_NEVER_DMA ? 0 : dma);
|
|
unlock_kernel();
|
|
|
|
return copy_to_user(retinfo, &tmp, sizeof(*retinfo)) ? -EFAULT : 0;
|
|
}
|
|
|
|
static int set_serial_info(struct esp_struct *info,
|
|
struct serial_struct __user *new_info)
|
|
{
|
|
struct serial_struct new_serial;
|
|
struct esp_struct old_info;
|
|
unsigned int change_irq;
|
|
int retval = 0;
|
|
struct esp_struct *current_async;
|
|
|
|
if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
|
|
return -EFAULT;
|
|
old_info = *info;
|
|
|
|
if ((new_serial.type != PORT_16550A) ||
|
|
(new_serial.hub6) ||
|
|
(info->io_port != new_serial.port) ||
|
|
(new_serial.baud_base != BASE_BAUD) ||
|
|
(new_serial.irq > 15) ||
|
|
(new_serial.irq < 2) ||
|
|
(new_serial.irq == 6) ||
|
|
(new_serial.irq == 8) ||
|
|
(new_serial.irq == 13))
|
|
return -EINVAL;
|
|
|
|
change_irq = new_serial.irq != info->irq;
|
|
|
|
if (change_irq && (info->line % 8))
|
|
return -EINVAL;
|
|
|
|
if (!capable(CAP_SYS_ADMIN)) {
|
|
if (change_irq ||
|
|
(new_serial.close_delay != info->close_delay) ||
|
|
((new_serial.flags & ~ASYNC_USR_MASK) !=
|
|
(info->port.flags & ~ASYNC_USR_MASK)))
|
|
return -EPERM;
|
|
info->port.flags = ((info->port.flags & ~ASYNC_USR_MASK) |
|
|
(new_serial.flags & ASYNC_USR_MASK));
|
|
info->custom_divisor = new_serial.custom_divisor;
|
|
} else {
|
|
if (new_serial.irq == 2)
|
|
new_serial.irq = 9;
|
|
|
|
if (change_irq) {
|
|
current_async = ports;
|
|
|
|
while (current_async) {
|
|
if ((current_async->line >= info->line) &&
|
|
(current_async->line < (info->line + 8))) {
|
|
if (current_async == info) {
|
|
if (current_async->port.count > 1)
|
|
return -EBUSY;
|
|
} else if (current_async->port.count)
|
|
return -EBUSY;
|
|
}
|
|
|
|
current_async = current_async->next_port;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* OK, past this point, all the error checking has been done.
|
|
* At this point, we start making changes.....
|
|
*/
|
|
|
|
info->port.flags = ((info->port.flags & ~ASYNC_FLAGS) |
|
|
(new_serial.flags & ASYNC_FLAGS));
|
|
info->custom_divisor = new_serial.custom_divisor;
|
|
info->close_delay = new_serial.close_delay * HZ/100;
|
|
info->closing_wait = new_serial.closing_wait * HZ/100;
|
|
|
|
if (change_irq) {
|
|
/*
|
|
* We need to shutdown the serial port at the old
|
|
* port/irq combination.
|
|
*/
|
|
shutdown(info);
|
|
|
|
current_async = ports;
|
|
|
|
while (current_async) {
|
|
if ((current_async->line >= info->line) &&
|
|
(current_async->line < (info->line + 8)))
|
|
current_async->irq = new_serial.irq;
|
|
|
|
current_async = current_async->next_port;
|
|
}
|
|
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_ENH_IRQ);
|
|
if (info->irq == 9)
|
|
serial_out(info, UART_ESI_CMD2, 0x02);
|
|
else
|
|
serial_out(info, UART_ESI_CMD2, info->irq);
|
|
}
|
|
}
|
|
|
|
if (info->port.flags & ASYNC_INITIALIZED) {
|
|
if (((old_info.port.flags & ASYNC_SPD_MASK) !=
|
|
(info->port.flags & ASYNC_SPD_MASK)) ||
|
|
(old_info.custom_divisor != info->custom_divisor)) {
|
|
if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
|
|
info->port.tty->alt_speed = 57600;
|
|
if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
|
|
info->port.tty->alt_speed = 115200;
|
|
if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
|
|
info->port.tty->alt_speed = 230400;
|
|
if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
|
|
info->port.tty->alt_speed = 460800;
|
|
change_speed(info);
|
|
}
|
|
} else
|
|
retval = startup(info);
|
|
|
|
return retval;
|
|
}
|
|
|
|
static int set_esp_config(struct esp_struct *info,
|
|
struct hayes_esp_config __user *new_info)
|
|
{
|
|
struct hayes_esp_config new_config;
|
|
unsigned int change_dma;
|
|
int retval = 0;
|
|
struct esp_struct *current_async;
|
|
unsigned long flags;
|
|
|
|
/* Perhaps a non-sysadmin user should be able to do some of these */
|
|
/* operations. I haven't decided yet. */
|
|
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (copy_from_user(&new_config, new_info, sizeof(new_config)))
|
|
return -EFAULT;
|
|
|
|
if ((new_config.flow_on >= new_config.flow_off) ||
|
|
(new_config.rx_trigger < 1) ||
|
|
(new_config.tx_trigger < 1) ||
|
|
(new_config.flow_off < 1) ||
|
|
(new_config.flow_on < 1) ||
|
|
(new_config.rx_trigger > 1023) ||
|
|
(new_config.tx_trigger > 1023) ||
|
|
(new_config.flow_off > 1023) ||
|
|
(new_config.flow_on > 1023) ||
|
|
(new_config.pio_threshold < 0) ||
|
|
(new_config.pio_threshold > 1024))
|
|
return -EINVAL;
|
|
|
|
if ((new_config.dma_channel != 1) && (new_config.dma_channel != 3))
|
|
new_config.dma_channel = 0;
|
|
|
|
if (info->stat_flags & ESP_STAT_NEVER_DMA)
|
|
change_dma = new_config.dma_channel;
|
|
else
|
|
change_dma = (new_config.dma_channel != dma);
|
|
|
|
if (change_dma) {
|
|
if (new_config.dma_channel) {
|
|
/* PIO mode to DMA mode transition OR */
|
|
/* change current DMA channel */
|
|
current_async = ports;
|
|
|
|
while (current_async) {
|
|
if (current_async == info) {
|
|
if (current_async->port.count > 1)
|
|
return -EBUSY;
|
|
} else if (current_async->port.count)
|
|
return -EBUSY;
|
|
|
|
current_async = current_async->next_port;
|
|
}
|
|
|
|
shutdown(info);
|
|
dma = new_config.dma_channel;
|
|
info->stat_flags &= ~ESP_STAT_NEVER_DMA;
|
|
|
|
/* all ports must use the same DMA channel */
|
|
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
current_async = ports;
|
|
|
|
while (current_async) {
|
|
esp_basic_init(current_async);
|
|
current_async = current_async->next_port;
|
|
}
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
} else {
|
|
/* DMA mode to PIO mode only */
|
|
if (info->port.count > 1)
|
|
return -EBUSY;
|
|
|
|
shutdown(info);
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
info->stat_flags |= ESP_STAT_NEVER_DMA;
|
|
esp_basic_init(info);
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
}
|
|
}
|
|
|
|
info->config.pio_threshold = new_config.pio_threshold;
|
|
|
|
if ((new_config.flow_off != info->config.flow_off) ||
|
|
(new_config.flow_on != info->config.flow_on)) {
|
|
info->config.flow_off = new_config.flow_off;
|
|
info->config.flow_on = new_config.flow_on;
|
|
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_LVL);
|
|
serial_out(info, UART_ESI_CMD2, new_config.flow_off >> 8);
|
|
serial_out(info, UART_ESI_CMD2, new_config.flow_off);
|
|
serial_out(info, UART_ESI_CMD2, new_config.flow_on >> 8);
|
|
serial_out(info, UART_ESI_CMD2, new_config.flow_on);
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
}
|
|
|
|
if ((new_config.rx_trigger != info->config.rx_trigger) ||
|
|
(new_config.tx_trigger != info->config.tx_trigger)) {
|
|
info->config.rx_trigger = new_config.rx_trigger;
|
|
info->config.tx_trigger = new_config.tx_trigger;
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_TRIGGER);
|
|
serial_out(info, UART_ESI_CMD2,
|
|
new_config.rx_trigger >> 8);
|
|
serial_out(info, UART_ESI_CMD2, new_config.rx_trigger);
|
|
serial_out(info, UART_ESI_CMD2,
|
|
new_config.tx_trigger >> 8);
|
|
serial_out(info, UART_ESI_CMD2, new_config.tx_trigger);
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
}
|
|
|
|
if (new_config.rx_timeout != info->config.rx_timeout) {
|
|
info->config.rx_timeout = new_config.rx_timeout;
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
|
|
if (info->IER & UART_IER_RDI) {
|
|
serial_out(info, UART_ESI_CMD1,
|
|
ESI_SET_RX_TIMEOUT);
|
|
serial_out(info, UART_ESI_CMD2,
|
|
new_config.rx_timeout);
|
|
}
|
|
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
}
|
|
|
|
if (!(info->port.flags & ASYNC_INITIALIZED))
|
|
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 esp_struct *info, unsigned int __user *value)
|
|
{
|
|
unsigned char status;
|
|
unsigned int result;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
|
|
status = serial_in(info, UART_ESI_STAT1);
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
|
|
return put_user(result, value);
|
|
}
|
|
|
|
|
|
static int esp_tiocmget(struct tty_struct *tty, struct file *file)
|
|
{
|
|
struct esp_struct *info = tty->driver_data;
|
|
unsigned char control, status;
|
|
unsigned long flags;
|
|
|
|
if (serial_paranoia_check(info, tty->name, __func__))
|
|
return -ENODEV;
|
|
if (tty->flags & (1 << TTY_IO_ERROR))
|
|
return -EIO;
|
|
|
|
control = info->MCR;
|
|
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
|
|
status = serial_in(info, UART_ESI_STAT2);
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
|
|
return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0)
|
|
| ((control & UART_MCR_DTR) ? TIOCM_DTR : 0)
|
|
| ((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);
|
|
}
|
|
|
|
static int esp_tiocmset(struct tty_struct *tty, struct file *file,
|
|
unsigned int set, unsigned int clear)
|
|
{
|
|
struct esp_struct *info = tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
if (serial_paranoia_check(info, tty->name, __func__))
|
|
return -ENODEV;
|
|
if (tty->flags & (1 << TTY_IO_ERROR))
|
|
return -EIO;
|
|
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
|
|
if (set & TIOCM_RTS)
|
|
info->MCR |= UART_MCR_RTS;
|
|
if (set & TIOCM_DTR)
|
|
info->MCR |= UART_MCR_DTR;
|
|
|
|
if (clear & TIOCM_RTS)
|
|
info->MCR &= ~UART_MCR_RTS;
|
|
if (clear & TIOCM_DTR)
|
|
info->MCR &= ~UART_MCR_DTR;
|
|
|
|
serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
|
|
serial_out(info, UART_ESI_CMD2, UART_MCR);
|
|
serial_out(info, UART_ESI_CMD2, info->MCR);
|
|
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* rs_break() --- routine which turns the break handling on or off
|
|
*/
|
|
static int esp_break(struct tty_struct *tty, int break_state)
|
|
{
|
|
struct esp_struct *info = tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "esp_break"))
|
|
return -EINVAL;
|
|
|
|
if (break_state == -1) {
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
serial_out(info, UART_ESI_CMD1, ESI_ISSUE_BREAK);
|
|
serial_out(info, UART_ESI_CMD2, 0x01);
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
|
|
/* FIXME - new style wait needed here */
|
|
interruptible_sleep_on(&info->break_wait);
|
|
} else {
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
serial_out(info, UART_ESI_CMD1, ESI_ISSUE_BREAK);
|
|
serial_out(info, UART_ESI_CMD2, 0x00);
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int rs_ioctl(struct tty_struct *tty, struct file *file,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct esp_struct *info = tty->driver_data;
|
|
struct async_icount cprev, cnow; /* kernel counter temps */
|
|
struct serial_icounter_struct __user *p_cuser; /* user space */
|
|
void __user *argp = (void __user *)arg;
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
|
|
return -ENODEV;
|
|
|
|
if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
|
|
(cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) &&
|
|
(cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT) &&
|
|
(cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT) &&
|
|
(cmd != TIOCGHAYESESP) && (cmd != TIOCSHAYESESP)) {
|
|
if (tty->flags & (1 << TTY_IO_ERROR))
|
|
return -EIO;
|
|
}
|
|
|
|
switch (cmd) {
|
|
case TIOCGSERIAL:
|
|
return get_serial_info(info, argp);
|
|
case TIOCSSERIAL:
|
|
lock_kernel();
|
|
ret = set_serial_info(info, argp);
|
|
unlock_kernel();
|
|
return ret;
|
|
case TIOCSERGWILD:
|
|
return put_user(0L, (unsigned long __user *)argp);
|
|
case TIOCSERGETLSR: /* Get line status register */
|
|
return get_lsr_info(info, argp);
|
|
case TIOCSERSWILD:
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
return 0;
|
|
/*
|
|
* 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:
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
cprev = info->icount; /* note the counters on entry */
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
while (1) {
|
|
/* FIXME: convert to new style wakeup */
|
|
interruptible_sleep_on(&info->delta_msr_wait);
|
|
/* see if a signal did it */
|
|
if (signal_pending(current))
|
|
return -ERESTARTSYS;
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
cnow = info->icount; /* atomic copy */
|
|
spin_unlock_irqrestore(&info->lock, 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:
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
cnow = info->icount;
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
p_cuser = argp;
|
|
if (put_user(cnow.cts, &p_cuser->cts) ||
|
|
put_user(cnow.dsr, &p_cuser->dsr) ||
|
|
put_user(cnow.rng, &p_cuser->rng) ||
|
|
put_user(cnow.dcd, &p_cuser->dcd))
|
|
return -EFAULT;
|
|
return 0;
|
|
case TIOCGHAYESESP:
|
|
return get_esp_config(info, argp);
|
|
case TIOCSHAYESESP:
|
|
lock_kernel();
|
|
ret = set_esp_config(info, argp);
|
|
unlock_kernel();
|
|
return ret;
|
|
default:
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
|
|
{
|
|
struct esp_struct *info = tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
change_speed(info);
|
|
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
|
|
/* Handle transition to B0 status */
|
|
if ((old_termios->c_cflag & CBAUD) &&
|
|
!(tty->termios->c_cflag & CBAUD)) {
|
|
info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS);
|
|
serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
|
|
serial_out(info, UART_ESI_CMD2, UART_MCR);
|
|
serial_out(info, UART_ESI_CMD2, info->MCR);
|
|
}
|
|
|
|
/* Handle transition away from B0 status */
|
|
if (!(old_termios->c_cflag & CBAUD) &&
|
|
(tty->termios->c_cflag & CBAUD)) {
|
|
info->MCR |= (UART_MCR_DTR | UART_MCR_RTS);
|
|
serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
|
|
serial_out(info, UART_ESI_CMD2, UART_MCR);
|
|
serial_out(info, UART_ESI_CMD2, info->MCR);
|
|
}
|
|
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
|
|
/* Handle turning of CRTSCTS */
|
|
if ((old_termios->c_cflag & CRTSCTS) &&
|
|
!(tty->termios->c_cflag & CRTSCTS)) {
|
|
rs_start(tty);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* ------------------------------------------------------------
|
|
* 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 esp_struct *info = tty->driver_data;
|
|
unsigned long flags;
|
|
|
|
if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
|
|
return;
|
|
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
|
|
if (tty_hung_up_p(filp)) {
|
|
DBG_CNT("before DEC-hung");
|
|
goto out;
|
|
}
|
|
|
|
#ifdef SERIAL_DEBUG_OPEN
|
|
printk(KERN_DEBUG "rs_close ttys%d, count = %d\n",
|
|
info->line, info->port.count);
|
|
#endif
|
|
if (tty->count == 1 && info->port.count != 1) {
|
|
/*
|
|
* Uh, oh. tty->count is 1, which means that the tty
|
|
* structure will be freed. Info->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(KERN_DEBUG "rs_close: bad serial port count; tty->count is 1, info->port.count is %d\n", info->port.count);
|
|
info->port.count = 1;
|
|
}
|
|
if (--info->port.count < 0) {
|
|
printk(KERN_ERR "rs_close: bad serial port count for ttys%d: %d\n",
|
|
info->line, info->port.count);
|
|
info->port.count = 0;
|
|
}
|
|
if (info->port.count) {
|
|
DBG_CNT("before DEC-2");
|
|
goto out;
|
|
}
|
|
info->port.flags |= ASYNC_CLOSING;
|
|
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
/*
|
|
* 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->IER &= ~UART_IER_RDI;
|
|
info->read_status_mask &= ~UART_LSR_DR;
|
|
if (info->port.flags & ASYNC_INITIALIZED) {
|
|
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK);
|
|
serial_out(info, UART_ESI_CMD2, info->IER);
|
|
|
|
/* disable receive timeout */
|
|
serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT);
|
|
serial_out(info, UART_ESI_CMD2, 0x00);
|
|
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
|
|
/*
|
|
* 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);
|
|
rs_flush_buffer(tty);
|
|
tty_ldisc_flush(tty);
|
|
tty->closing = 0;
|
|
info->port.tty = NULL;
|
|
|
|
if (info->port.blocked_open) {
|
|
if (info->close_delay)
|
|
msleep_interruptible(jiffies_to_msecs(info->close_delay));
|
|
wake_up_interruptible(&info->port.open_wait);
|
|
}
|
|
info->port.flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
|
|
wake_up_interruptible(&info->port.close_wait);
|
|
return;
|
|
|
|
out:
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
}
|
|
|
|
static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
|
|
{
|
|
struct esp_struct *info = tty->driver_data;
|
|
unsigned long orig_jiffies, char_time;
|
|
unsigned long flags;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
|
|
return;
|
|
|
|
orig_jiffies = jiffies;
|
|
char_time = ((info->timeout - HZ / 50) / 1024) / 5;
|
|
|
|
if (!char_time)
|
|
char_time = 1;
|
|
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
|
|
serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
|
|
|
|
while ((serial_in(info, UART_ESI_STAT1) != 0x03) ||
|
|
(serial_in(info, UART_ESI_STAT2) != 0xff)) {
|
|
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
msleep_interruptible(jiffies_to_msecs(char_time));
|
|
|
|
if (signal_pending(current))
|
|
return;
|
|
|
|
if (timeout && time_after(jiffies, orig_jiffies + timeout))
|
|
return;
|
|
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND);
|
|
serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL);
|
|
}
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
set_current_state(TASK_RUNNING);
|
|
}
|
|
|
|
/*
|
|
* esp_hangup() --- called by tty_hangup() when a hangup is signaled.
|
|
*/
|
|
static void esp_hangup(struct tty_struct *tty)
|
|
{
|
|
struct esp_struct *info = tty->driver_data;
|
|
|
|
if (serial_paranoia_check(info, tty->name, "esp_hangup"))
|
|
return;
|
|
|
|
rs_flush_buffer(tty);
|
|
shutdown(info);
|
|
info->port.count = 0;
|
|
info->port.flags &= ~ASYNC_NORMAL_ACTIVE;
|
|
info->port.tty = NULL;
|
|
wake_up_interruptible(&info->port.open_wait);
|
|
}
|
|
|
|
static int esp_carrier_raised(struct tty_port *port)
|
|
{
|
|
struct esp_struct *info = container_of(port, struct esp_struct, port);
|
|
serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
|
|
if (serial_in(info, UART_ESI_STAT2) & UART_MSR_DCD)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* ------------------------------------------------------------
|
|
* esp_open() and friends
|
|
* ------------------------------------------------------------
|
|
*/
|
|
static int block_til_ready(struct tty_struct *tty, struct file *filp,
|
|
struct esp_struct *info)
|
|
{
|
|
DECLARE_WAITQUEUE(wait, current);
|
|
int retval;
|
|
int do_clocal = 0;
|
|
unsigned long flags;
|
|
int cd;
|
|
struct tty_port *port = &info->port;
|
|
|
|
/*
|
|
* 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) ||
|
|
(port->flags & ASYNC_CLOSING)) {
|
|
if (port->flags & ASYNC_CLOSING)
|
|
interruptible_sleep_on(&port->close_wait);
|
|
#ifdef SERIAL_DO_RESTART
|
|
if (port->flags & ASYNC_HUP_NOTIFY)
|
|
return -EAGAIN;
|
|
else
|
|
return -ERESTARTSYS;
|
|
#else
|
|
return -EAGAIN;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* 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))) {
|
|
port->flags |= ASYNC_NORMAL_ACTIVE;
|
|
return 0;
|
|
}
|
|
|
|
if (tty->termios->c_cflag & CLOCAL)
|
|
do_clocal = 1;
|
|
|
|
/*
|
|
* Block waiting for the carrier detect and the line to become
|
|
* free (i.e., not in use by the callout). While we are in
|
|
* this loop, port->count is dropped by one, so that
|
|
* rs_close() knows when to free things. We restore it upon
|
|
* exit, either normal or abnormal.
|
|
*/
|
|
retval = 0;
|
|
add_wait_queue(&port->open_wait, &wait);
|
|
#ifdef SERIAL_DEBUG_OPEN
|
|
printk(KERN_DEBUG "block_til_ready before block: ttys%d, count = %d\n",
|
|
info->line, port->count);
|
|
#endif
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
if (!tty_hung_up_p(filp))
|
|
port->count--;
|
|
port->blocked_open++;
|
|
while (1) {
|
|
if ((tty->termios->c_cflag & CBAUD)) {
|
|
unsigned int scratch;
|
|
|
|
serial_out(info, UART_ESI_CMD1, ESI_READ_UART);
|
|
serial_out(info, UART_ESI_CMD2, UART_MCR);
|
|
scratch = serial_in(info, UART_ESI_STAT1);
|
|
serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
|
|
serial_out(info, UART_ESI_CMD2, UART_MCR);
|
|
serial_out(info, UART_ESI_CMD2,
|
|
scratch | UART_MCR_DTR | UART_MCR_RTS);
|
|
}
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
if (tty_hung_up_p(filp) ||
|
|
!(port->flags & ASYNC_INITIALIZED)) {
|
|
#ifdef SERIAL_DO_RESTART
|
|
if (port->flags & ASYNC_HUP_NOTIFY)
|
|
retval = -EAGAIN;
|
|
else
|
|
retval = -ERESTARTSYS;
|
|
#else
|
|
retval = -EAGAIN;
|
|
#endif
|
|
break;
|
|
}
|
|
|
|
cd = tty_port_carrier_raised(port);
|
|
|
|
if (!(port->flags & ASYNC_CLOSING) &&
|
|
(do_clocal))
|
|
break;
|
|
if (signal_pending(current)) {
|
|
retval = -ERESTARTSYS;
|
|
break;
|
|
}
|
|
#ifdef SERIAL_DEBUG_OPEN
|
|
printk(KERN_DEBUG "block_til_ready blocking: ttys%d, count = %d\n",
|
|
info->line, port->count);
|
|
#endif
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
schedule();
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
}
|
|
set_current_state(TASK_RUNNING);
|
|
remove_wait_queue(&port->open_wait, &wait);
|
|
if (!tty_hung_up_p(filp))
|
|
port->count++;
|
|
port->blocked_open--;
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
#ifdef SERIAL_DEBUG_OPEN
|
|
printk(KERN_DEBUG "block_til_ready after blocking: ttys%d, count = %d\n",
|
|
info->line, port->count);
|
|
#endif
|
|
if (retval)
|
|
return retval;
|
|
port->flags |= ASYNC_NORMAL_ACTIVE;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This routine is called whenever a serial port is opened. It
|
|
* enables interrupts for a serial port, linking in its async structure into
|
|
* the IRQ chain. It also performs the serial-specific
|
|
* initialization for the tty structure.
|
|
*/
|
|
static int esp_open(struct tty_struct *tty, struct file *filp)
|
|
{
|
|
struct esp_struct *info;
|
|
int retval, line;
|
|
unsigned long flags;
|
|
|
|
line = tty->index;
|
|
if ((line < 0) || (line >= NR_PORTS))
|
|
return -ENODEV;
|
|
|
|
/* find the port in the chain */
|
|
|
|
info = ports;
|
|
|
|
while (info && (info->line != line))
|
|
info = info->next_port;
|
|
|
|
if (!info) {
|
|
serial_paranoia_check(info, tty->name, "esp_open");
|
|
return -ENODEV;
|
|
}
|
|
|
|
#ifdef SERIAL_DEBUG_OPEN
|
|
printk(KERN_DEBUG "esp_open %s, count = %d\n", tty->name, info->port.count);
|
|
#endif
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
info->port.count++;
|
|
tty->driver_data = info;
|
|
info->port.tty = tty;
|
|
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
|
|
/*
|
|
* Start up serial port
|
|
*/
|
|
retval = startup(info);
|
|
if (retval)
|
|
return retval;
|
|
|
|
retval = block_til_ready(tty, filp, info);
|
|
if (retval) {
|
|
#ifdef SERIAL_DEBUG_OPEN
|
|
printk(KERN_DEBUG "esp_open returning after block_til_ready with %d\n",
|
|
retval);
|
|
#endif
|
|
return retval;
|
|
}
|
|
#ifdef SERIAL_DEBUG_OPEN
|
|
printk(KERN_DEBUG "esp_open %s successful...", tty->name);
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* ---------------------------------------------------------------------
|
|
* espserial_init() and friends
|
|
*
|
|
* espserial_init() is called at boot-time to initialize the serial driver.
|
|
* ---------------------------------------------------------------------
|
|
*/
|
|
|
|
/*
|
|
* This routine prints out the appropriate serial driver version
|
|
* number, and identifies which options were configured into this
|
|
* driver.
|
|
*/
|
|
|
|
static void show_serial_version(void)
|
|
{
|
|
printk(KERN_INFO "%s version %s (DMA %u)\n",
|
|
serial_name, serial_version, dma);
|
|
}
|
|
|
|
/*
|
|
* This routine is called by espserial_init() to initialize a specific serial
|
|
* port.
|
|
*/
|
|
static int autoconfig(struct esp_struct *info)
|
|
{
|
|
int port_detected = 0;
|
|
unsigned long flags;
|
|
|
|
if (!request_region(info->io_port, REGION_SIZE, "esp serial"))
|
|
return -EIO;
|
|
|
|
spin_lock_irqsave(&info->lock, flags);
|
|
/*
|
|
* Check for ESP card
|
|
*/
|
|
|
|
if (serial_in(info, UART_ESI_BASE) == 0xf3) {
|
|
serial_out(info, UART_ESI_CMD1, 0x00);
|
|
serial_out(info, UART_ESI_CMD1, 0x01);
|
|
|
|
if ((serial_in(info, UART_ESI_STAT2) & 0x70) == 0x20) {
|
|
port_detected = 1;
|
|
|
|
if (!(info->irq)) {
|
|
serial_out(info, UART_ESI_CMD1, 0x02);
|
|
|
|
if (serial_in(info, UART_ESI_STAT1) & 0x01)
|
|
info->irq = 3;
|
|
else
|
|
info->irq = 4;
|
|
}
|
|
|
|
|
|
/* put card in enhanced mode */
|
|
/* this prevents access through */
|
|
/* the "old" IO ports */
|
|
esp_basic_init(info);
|
|
|
|
/* clear out MCR */
|
|
serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART);
|
|
serial_out(info, UART_ESI_CMD2, UART_MCR);
|
|
serial_out(info, UART_ESI_CMD2, 0x00);
|
|
}
|
|
}
|
|
if (!port_detected)
|
|
release_region(info->io_port, REGION_SIZE);
|
|
|
|
spin_unlock_irqrestore(&info->lock, flags);
|
|
return (port_detected);
|
|
}
|
|
|
|
static const struct tty_operations esp_ops = {
|
|
.open = esp_open,
|
|
.close = rs_close,
|
|
.write = rs_write,
|
|
.put_char = rs_put_char,
|
|
.flush_chars = rs_flush_chars,
|
|
.write_room = rs_write_room,
|
|
.chars_in_buffer = rs_chars_in_buffer,
|
|
.flush_buffer = rs_flush_buffer,
|
|
.ioctl = rs_ioctl,
|
|
.throttle = rs_throttle,
|
|
.unthrottle = rs_unthrottle,
|
|
.set_termios = rs_set_termios,
|
|
.stop = rs_stop,
|
|
.start = rs_start,
|
|
.hangup = esp_hangup,
|
|
.break_ctl = esp_break,
|
|
.wait_until_sent = rs_wait_until_sent,
|
|
.tiocmget = esp_tiocmget,
|
|
.tiocmset = esp_tiocmset,
|
|
};
|
|
|
|
static const struct tty_port_operations esp_port_ops = {
|
|
.esp_carrier_raised,
|
|
};
|
|
|
|
/*
|
|
* The serial driver boot-time initialization code!
|
|
*/
|
|
static int __init espserial_init(void)
|
|
{
|
|
int i, offset;
|
|
struct esp_struct *info;
|
|
struct esp_struct *last_primary = NULL;
|
|
int esp[] = { 0x100, 0x140, 0x180, 0x200, 0x240, 0x280, 0x300, 0x380 };
|
|
|
|
esp_driver = alloc_tty_driver(NR_PORTS);
|
|
if (!esp_driver)
|
|
return -ENOMEM;
|
|
|
|
for (i = 0; i < NR_PRIMARY; i++) {
|
|
if (irq[i] != 0) {
|
|
if ((irq[i] < 2) || (irq[i] > 15) || (irq[i] == 6) ||
|
|
(irq[i] == 8) || (irq[i] == 13))
|
|
irq[i] = 0;
|
|
else if (irq[i] == 2)
|
|
irq[i] = 9;
|
|
}
|
|
}
|
|
|
|
if ((dma != 1) && (dma != 3))
|
|
dma = 0;
|
|
|
|
if ((rx_trigger < 1) || (rx_trigger > 1023))
|
|
rx_trigger = 768;
|
|
|
|
if ((tx_trigger < 1) || (tx_trigger > 1023))
|
|
tx_trigger = 768;
|
|
|
|
if ((flow_off < 1) || (flow_off > 1023))
|
|
flow_off = 1016;
|
|
|
|
if ((flow_on < 1) || (flow_on > 1023))
|
|
flow_on = 944;
|
|
|
|
if ((rx_timeout < 0) || (rx_timeout > 255))
|
|
rx_timeout = 128;
|
|
|
|
if (flow_on >= flow_off)
|
|
flow_on = flow_off - 1;
|
|
|
|
show_serial_version();
|
|
|
|
/* Initialize the tty_driver structure */
|
|
|
|
esp_driver->owner = THIS_MODULE;
|
|
esp_driver->name = "ttyP";
|
|
esp_driver->major = ESP_IN_MAJOR;
|
|
esp_driver->minor_start = 0;
|
|
esp_driver->type = TTY_DRIVER_TYPE_SERIAL;
|
|
esp_driver->subtype = SERIAL_TYPE_NORMAL;
|
|
esp_driver->init_termios = tty_std_termios;
|
|
esp_driver->init_termios.c_cflag =
|
|
B9600 | CS8 | CREAD | HUPCL | CLOCAL;
|
|
esp_driver->init_termios.c_ispeed = 9600;
|
|
esp_driver->init_termios.c_ospeed = 9600;
|
|
esp_driver->flags = TTY_DRIVER_REAL_RAW;
|
|
tty_set_operations(esp_driver, &esp_ops);
|
|
if (tty_register_driver(esp_driver)) {
|
|
printk(KERN_ERR "Couldn't register esp serial driver");
|
|
put_tty_driver(esp_driver);
|
|
return 1;
|
|
}
|
|
|
|
info = kzalloc(sizeof(struct esp_struct), GFP_KERNEL);
|
|
|
|
if (!info) {
|
|
printk(KERN_ERR "Couldn't allocate memory for esp serial device information\n");
|
|
tty_unregister_driver(esp_driver);
|
|
put_tty_driver(esp_driver);
|
|
return 1;
|
|
}
|
|
|
|
spin_lock_init(&info->lock);
|
|
/* rx_trigger, tx_trigger are needed by autoconfig */
|
|
info->config.rx_trigger = rx_trigger;
|
|
info->config.tx_trigger = tx_trigger;
|
|
|
|
i = 0;
|
|
offset = 0;
|
|
|
|
do {
|
|
tty_port_init(&info->port);
|
|
info->port.ops = &esp_port_ops;
|
|
info->io_port = esp[i] + offset;
|
|
info->irq = irq[i];
|
|
info->line = (i * 8) + (offset / 8);
|
|
|
|
if (!autoconfig(info)) {
|
|
i++;
|
|
offset = 0;
|
|
continue;
|
|
}
|
|
|
|
info->custom_divisor = (divisor[i] >> (offset / 2)) & 0xf;
|
|
info->port.flags = STD_COM_FLAGS;
|
|
if (info->custom_divisor)
|
|
info->port.flags |= ASYNC_SPD_CUST;
|
|
info->magic = ESP_MAGIC;
|
|
info->close_delay = 5*HZ/10;
|
|
info->closing_wait = 30*HZ;
|
|
info->config.rx_timeout = rx_timeout;
|
|
info->config.flow_on = flow_on;
|
|
info->config.flow_off = flow_off;
|
|
info->config.pio_threshold = pio_threshold;
|
|
info->next_port = ports;
|
|
init_waitqueue_head(&info->delta_msr_wait);
|
|
init_waitqueue_head(&info->break_wait);
|
|
ports = info;
|
|
printk(KERN_INFO "ttyP%d at 0x%04x (irq = %d) is an ESP ",
|
|
info->line, info->io_port, info->irq);
|
|
|
|
if (info->line % 8) {
|
|
printk("secondary port\n");
|
|
/* 8 port cards can't do DMA */
|
|
info->stat_flags |= ESP_STAT_NEVER_DMA;
|
|
|
|
if (last_primary)
|
|
last_primary->stat_flags |= ESP_STAT_NEVER_DMA;
|
|
} else {
|
|
printk("primary port\n");
|
|
last_primary = info;
|
|
irq[i] = info->irq;
|
|
}
|
|
|
|
if (!dma)
|
|
info->stat_flags |= ESP_STAT_NEVER_DMA;
|
|
|
|
info = kzalloc(sizeof(struct esp_struct), GFP_KERNEL);
|
|
if (!info) {
|
|
printk(KERN_ERR "Couldn't allocate memory for esp serial device information\n");
|
|
/* allow use of the already detected ports */
|
|
return 0;
|
|
}
|
|
|
|
spin_lock_init(&info->lock);
|
|
/* rx_trigger, tx_trigger are needed by autoconfig */
|
|
info->config.rx_trigger = rx_trigger;
|
|
info->config.tx_trigger = tx_trigger;
|
|
|
|
if (offset == 56) {
|
|
i++;
|
|
offset = 0;
|
|
} else {
|
|
offset += 8;
|
|
}
|
|
} while (i < NR_PRIMARY);
|
|
|
|
/* free the last port memory allocation */
|
|
kfree(info);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit espserial_exit(void)
|
|
{
|
|
int e1;
|
|
struct esp_struct *temp_async;
|
|
struct esp_pio_buffer *pio_buf;
|
|
|
|
e1 = tty_unregister_driver(esp_driver);
|
|
if (e1)
|
|
printk(KERN_ERR "esp: failed to unregister driver (%d)\n", e1);
|
|
put_tty_driver(esp_driver);
|
|
|
|
while (ports) {
|
|
if (ports->io_port)
|
|
release_region(ports->io_port, REGION_SIZE);
|
|
temp_async = ports->next_port;
|
|
kfree(ports);
|
|
ports = temp_async;
|
|
}
|
|
|
|
if (dma_buffer)
|
|
free_pages((unsigned long)dma_buffer,
|
|
get_order(DMA_BUFFER_SZ));
|
|
|
|
while (free_pio_buf) {
|
|
pio_buf = free_pio_buf->next;
|
|
kfree(free_pio_buf);
|
|
free_pio_buf = pio_buf;
|
|
}
|
|
}
|
|
|
|
module_init(espserial_init);
|
|
module_exit(espserial_exit);
|