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Commit f53a2ade authored by Alan Cox's avatar Alan Cox Committed by Greg Kroah-Hartman
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tty: esp: remove broken driver 

The ESP driver has been marked broken for years. It's an old ISA device
that clearly nobody cares about any more. Remove it
Signed-off-by: default avatarAlan Cox <alan@linux.intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 1cceefd3
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Documentation/serial/hayes-esp.txt deleted 100644 → 0
View file @ 1cceefd3
HAYES ESP DRIVER VERSION 2.1
A big thanks to the people at Hayes, especially Alan Adamson. Their support
has enabled me to provide enhancements to the driver.
Please report your experiences with this driver to me (arobinso@nyx.net). I
am looking for both positive and negative feedback.
*** IMPORTANT CHANGES FOR 2.1 ***
Support for PIO mode. Five situations will cause PIO mode to be used:
1) A multiport card is detected. PIO mode will always be used. (8 port cards
do not support DMA).
2) The DMA channel is set to an invalid value (anything other than 1 or 3).
3) The DMA buffer/channel could not be allocated. The port will revert to PIO
mode until it is reopened.
4) Less than a specified number of bytes need to be transferred to/from the
FIFOs. PIO mode will be used for that transfer only.
5) A port needs to do a DMA transfer and another port is already using the
DMA channel. PIO mode will be used for that transfer only.
Since the Hayes ESP seems to conflict with other cards (notably sound cards)
when using DMA, DMA is turned off by default. To use DMA, it must be turned
on explicitly, either with the "dma=" option described below or with
setserial. A multiport card can be forced into DMA mode by using setserial;
however, most multiport cards don't support DMA.
The latest version of setserial allows the enhanced configuration of the ESP
card to be viewed and modified.
***
This package contains the files needed to compile a module to support the Hayes
ESP card. The drivers are basically a modified version of the serial drivers.
Features:
- Uses the enhanced mode of the ESP card, allowing a wider range of
interrupts and features than compatibility mode
- Uses DMA and 16 bit PIO mode to transfer data to and from the ESP's FIFOs,
reducing CPU load
- Supports primary and secondary ports
If the driver is compiled as a module, the IRQs to use can be specified by
using the irq= option. The format is:
irq=[0x100],[0x140],[0x180],[0x200],[0x240],[0x280],[0x300],[0x380]
The address in brackets is the base address of the card. The IRQ of
nonexistent cards can be set to 0. If an IRQ of a card that does exist is set
to 0, the driver will attempt to guess at the correct IRQ. For example, to set
the IRQ of the card at address 0x300 to 12, the insmod command would be:
insmod esp irq=0,0,0,0,0,0,12,0
The custom divisor can be set by using the divisor= option. The format is the
same as for the irq= option. Each divisor value is a series of hex digits,
with each digit representing the divisor to use for a corresponding port. The
divisor value is constructed RIGHT TO LEFT. Specifying a nonzero divisor value
will automatically set the spd_cust flag. To calculate the divisor to use for
a certain baud rate, divide the port's base baud (generally 921600) by the
desired rate. For example, to set the divisor of the primary port at 0x300 to
4 and the divisor of the secondary port at 0x308 to 8, the insmod command would
be:
insmod esp divisor=0,0,0,0,0,0,0x84,0
The dma= option can be used to set the DMA channel. The channel can be either
1 or 3. Specifying any other value will force the driver to use PIO mode.
For example, to set the DMA channel to 3, the insmod command would be:
insmod esp dma=3
The rx_trigger= and tx_trigger= options can be used to set the FIFO trigger
levels. They specify when the ESP card should send an interrupt. Larger
values will decrease the number of interrupts; however, a value too high may
result in data loss. Valid values are 1 through 1023, with 768 being the
default. For example, to set the receive trigger level to 512 bytes and the
transmit trigger level to 700 bytes, the insmod command would be:
insmod esp rx_trigger=512 tx_trigger=700
The flow_off= and flow_on= options can be used to set the hardware flow off/
flow on levels. The flow on level must be lower than the flow off level, and
the flow off level should be higher than rx_trigger. Valid values are 1
through 1023, with 1016 being the default flow off level and 944 being the
default flow on level. For example, to set the flow off level to 1000 bytes
and the flow on level to 935 bytes, the insmod command would be:
insmod esp flow_off=1000 flow_on=935
The rx_timeout= option can be used to set the receive timeout value. This
value indicates how long after receiving the last character that the ESP card
should wait before signalling an interrupt. Valid values are 0 though 255,
with 128 being the default. A value too high will increase latency, and a
value too low will cause unnecessary interrupts. For example, to set the
receive timeout to 255, the insmod command would be:
insmod esp rx_timeout=255
The pio_threshold= option sets the threshold (in number of characters) for
using PIO mode instead of DMA mode. For example, if this value is 32,
transfers of 32 bytes or less will always use PIO mode.
insmod esp pio_threshold=32
Multiple options can be listed on the insmod command line by separating each
option with a space. For example:
insmod esp dma=3 trigger=512
The esp module can be automatically loaded when needed. To cause this to
happen, add the following lines to /etc/modprobe.conf (replacing the last line
with options for your configuration):
alias char-major-57 esp
alias char-major-58 esp
options esp irq=0,0,0,0,0,0,3,0 divisor=0,0,0,0,0,0,0x4,0
You may also need to run 'depmod -a'.
Devices must be created manually. To create the devices, note the output from
the module after it is inserted. The output will appear in the location where
kernel messages usually appear (usually /var/adm/messages). Create two devices
for each 'tty' mentioned, one with major of 57 and the other with major of 58.
The minor number should be the same as the tty number reported. The commands
would be (replace ? with the tty number):
mknod /dev/ttyP? c 57 ?
mknod /dev/cup? c 58 ?
For example, if the following line appears:
Oct 24 18:17:23 techno kernel: ttyP8 at 0x0140 (irq = 3) is an ESP primary port
...two devices should be created:
mknod /dev/ttyP8 c 57 8
mknod /dev/cup8 c 58 8
You may need to set the permissions on the devices:
chmod 666 /dev/ttyP*
chmod 666 /dev/cup*
The ESP module and the serial module should not conflict (they can be used at
the same time). After the ESP module has been loaded the ports on the ESP card
will no longer be accessible by the serial driver.
If I/O errors are experienced when accessing the port, check for IRQ and DMA
conflicts ('cat /proc/interrupts' and 'cat /proc/dma' for a list of IRQs and
DMAs currently in use).
Enjoy!
Andrew J. Robinson <arobinso@nyx.net>
drivers/char/Kconfig
View file @ f53a2ade
......@@ -201,19 +201,6 @@ config DIGIEPCA
To compile this driver as a module, choose M here: the
module will be called epca.
config ESPSERIAL
tristate "Hayes ESP serial port support"
depends on SERIAL_NONSTANDARD && ISA && ISA_DMA_API && BROKEN
help
This is a driver which supports Hayes ESP serial ports. Both single
port cards and multiport cards are supported. Make sure to read
<file:Documentation/hayes-esp.txt>.
To compile this driver as a module, choose M here: the
module will be called esp.
If unsure, say N.
config MOXA_INTELLIO
tristate "Moxa Intellio support"
depends on SERIAL_NONSTANDARD && (ISA || EISA || PCI)
......
drivers/char/Makefile
View file @ f53a2ade
......@@ -18,7 +18,6 @@ obj-$(CONFIG_CONSOLE_TRANSLATIONS) += consolemap.o consolemap_deftbl.o
obj-$(CONFIG_HW_CONSOLE) += vt.o defkeymap.o
obj-$(CONFIG_AUDIT) += tty_audit.o
obj-$(CONFIG_MAGIC_SYSRQ) += sysrq.o
obj-$(CONFIG_ESPSERIAL) += esp.o
obj-$(CONFIG_MVME147_SCC) += generic_serial.o vme_scc.o
obj-$(CONFIG_MVME162_SCC) += generic_serial.o vme_scc.o
obj-$(CONFIG_BVME6000_SCC) += generic_serial.o vme_scc.o
......
drivers/char/esp.c deleted 100644 → 0
View file @ 1cceefd3
/*
* 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->port.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->port.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->port.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 __init 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->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);
include/linux/Kbuild
View file @ f53a2ade
......@@ -214,7 +214,6 @@ unifdef-y += futex.h
unifdef-y += fs.h
unifdef-y += gameport.h
unifdef-y += generic_serial.h
unifdef-y += hayesesp.h
unifdef-y += hdlcdrv.h
unifdef-y += hdlc.h
unifdef-y += hdreg.h
......
include/linux/hayesesp.h deleted 100644 → 0
View file @ 1cceefd3
#ifndef HAYESESP_H
#define HAYESESP_H
struct hayes_esp_config {
short flow_on;
short flow_off;
short rx_trigger;
short tx_trigger;
short pio_threshold;
unsigned char rx_timeout;
char dma_channel;
};
#ifdef __KERNEL__
#define ESP_DMA_CHANNEL 0
#define ESP_RX_TRIGGER 768
#define ESP_TX_TRIGGER 768
#define ESP_FLOW_OFF 1016
#define ESP_FLOW_ON 944
#define ESP_RX_TMOUT 128
#define ESP_PIO_THRESHOLD 32
#define ESP_IN_MAJOR 57 /* major dev # for dial in */
#define ESP_OUT_MAJOR 58 /* major dev # for dial out */
#define ESPC_SCALE 3
#define UART_ESI_BASE 0x00
#define UART_ESI_SID 0x01
#define UART_ESI_RX 0x02
#define UART_ESI_TX 0x02
#define UART_ESI_CMD1 0x04
#define UART_ESI_CMD2 0x05
#define UART_ESI_STAT1 0x04
#define UART_ESI_STAT2 0x05
#define UART_ESI_RWS 0x07
#define UART_IER_DMA_TMOUT 0x80
#define UART_IER_DMA_TC 0x08
#define ESI_SET_IRQ 0x04
#define ESI_SET_DMA_TMOUT 0x05
#define ESI_SET_SRV_MASK 0x06
#define ESI_SET_ERR_MASK 0x07
#define ESI_SET_FLOW_CNTL 0x08
#define ESI_SET_FLOW_CHARS 0x09
#define ESI_SET_FLOW_LVL 0x0a
#define ESI_SET_TRIGGER 0x0b
#define ESI_SET_RX_TIMEOUT 0x0c
#define ESI_SET_FLOW_TMOUT 0x0d
#define ESI_WRITE_UART 0x0e
#define ESI_READ_UART 0x0f
#define ESI_SET_MODE 0x10
#define ESI_GET_ERR_STAT 0x12
#define ESI_GET_UART_STAT 0x13
#define ESI_GET_RX_AVAIL 0x14
#define ESI_GET_TX_AVAIL 0x15
#define ESI_START_DMA_RX 0x16
#define ESI_START_DMA_TX 0x17
#define ESI_ISSUE_BREAK 0x1a
#define ESI_FLUSH_RX 0x1b
#define ESI_FLUSH_TX 0x1c
#define ESI_SET_BAUD 0x1d
#define ESI_SET_ENH_IRQ 0x1f
#define ESI_SET_REINTR 0x20
#define ESI_SET_PRESCALAR 0x23
#define ESI_NO_COMMAND 0xff
#define ESP_STAT_RX_TIMEOUT 0x01
#define ESP_STAT_DMA_RX 0x02
#define ESP_STAT_DMA_TX 0x04
#define ESP_STAT_NEVER_DMA 0x08
#define ESP_STAT_USE_PIO 0x10
#define ESP_MAGIC 0x53ee
#define ESP_XMIT_SIZE 4096
struct esp_struct {
int magic;
struct tty_port port;
spinlock_t lock;
int io_port;
int irq;
int read_status_mask;
int ignore_status_mask;
int timeout;
int stat_flags;
int custom_divisor;
int close_delay;
unsigned short closing_wait;
unsigned short closing_wait2;
int IER; /* Interrupt Enable Register */
int MCR; /* Modem control register */
unsigned long last_active;
int line;
unsigned char *xmit_buf;
int xmit_head;
int xmit_tail;
int xmit_cnt;
wait_queue_head_t break_wait;
struct async_icount icount; /* kernel counters for the 4 input interrupts */
struct hayes_esp_config config; /* port configuration */
struct esp_struct *next_port; /* For the linked list */
};
struct esp_pio_buffer {
unsigned char data[1024];
struct esp_pio_buffer *next;
};
#endif /* __KERNEL__ */
#endif /* ESP_H */
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