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esp.c
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/*
* 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 <[email protected]>
*
* 03/96: Modularised by Angelo Haritsis <[email protected]>
*
* 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
* <[email protected]> (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 <[email protected]> -
* 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 ([email protected]), 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;