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|
/**
* ipoctal.c
*
* driver for the GE IP-OCTAL boards
* Copyright (c) 2009 Nicolas Serafini, EIC2 SA
* Copyright (c) 2010,2011 Samuel Iglesias Gonsalvez <siglesia@cern.ch>, CERN
* Copyright (c) 2012 Samuel Iglesias Gonsalvez <siglesias@igalia.com>, Igalia
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; version 2 of the License.
*/
#include <linux/device.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/interrupt.h>
#include <linux/fs.h>
#include <linux/delay.h>
#include <linux/sched.h>
#include <linux/tty.h>
#include <linux/serial.h>
#include <linux/tty_flip.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/atomic.h>
#include "../ipack.h"
#include "ipoctal.h"
#include "scc2698.h"
#define IP_OCTAL_MANUFACTURER_ID 0xF0
#define IP_OCTAL_232_ID 0x22
#define IP_OCTAL_422_ID 0x2A
#define IP_OCTAL_485_ID 0x48
#define IP_OCTAL_ID_SPACE_VECTOR 0x41
#define IP_OCTAL_NB_BLOCKS 4
static struct ipack_driver driver;
static const struct tty_operations ipoctal_fops;
struct ipoctal {
struct list_head list;
struct ipack_device *dev;
unsigned int board_id;
struct scc2698_channel *chan_regs;
struct scc2698_block *block_regs;
struct ipoctal_stats chan_stats[NR_CHANNELS];
char *buffer[NR_CHANNELS];
unsigned int nb_bytes[NR_CHANNELS];
unsigned int count_wr[NR_CHANNELS];
struct ipoctal_config chan_config[NR_CHANNELS];
wait_queue_head_t queue[NR_CHANNELS];
unsigned short error_flag[NR_CHANNELS];
spinlock_t lock[NR_CHANNELS];
unsigned int pointer_read[NR_CHANNELS];
unsigned int pointer_write[NR_CHANNELS];
atomic_t open[NR_CHANNELS];
unsigned char write;
struct tty_port tty_port[NR_CHANNELS];
struct tty_driver *tty_drv;
};
/* Linked list to save the registered devices */
static LIST_HEAD(ipoctal_list);
static inline void ipoctal_write_io_reg(struct ipoctal *ipoctal,
unsigned char *dest,
unsigned char value)
{
unsigned long offset;
offset = ((void __iomem *) dest) - ipoctal->dev->io_space.address;
ipoctal->dev->bus->ops->write8(ipoctal->dev, IPACK_IO_SPACE, offset,
value);
}
static inline void ipoctal_write_cr_cmd(struct ipoctal *ipoctal,
unsigned char *dest,
unsigned char value)
{
ipoctal_write_io_reg(ipoctal, dest, value);
}
static inline unsigned char ipoctal_read_io_reg(struct ipoctal *ipoctal,
unsigned char *src)
{
unsigned long offset;
unsigned char value;
offset = ((void __iomem *) src) - ipoctal->dev->io_space.address;
ipoctal->dev->bus->ops->read8(ipoctal->dev, IPACK_IO_SPACE, offset,
&value);
return value;
}
static struct ipoctal *ipoctal_find_board(struct tty_struct *tty)
{
struct ipoctal *p;
list_for_each_entry(p, &ipoctal_list, list) {
if (tty->driver->major == p->tty_drv->major)
return p;
}
return NULL;
}
static int ipoctal_port_activate(struct tty_port *port, struct tty_struct *tty)
{
struct ipoctal *ipoctal;
int channel = tty->index;
ipoctal = ipoctal_find_board(tty);
if (ipoctal == NULL) {
dev_err(tty->dev, "Device not found. Major %d\n",
tty->driver->major);
return -ENODEV;
}
ipoctal_write_io_reg(ipoctal, &ipoctal->chan_regs[channel].u.w.cr,
CR_ENABLE_RX);
tty->driver_data = ipoctal;
return 0;
}
static int ipoctal_open(struct tty_struct *tty, struct file *file)
{
int channel = tty->index;
int res;
struct ipoctal *ipoctal;
ipoctal = ipoctal_find_board(tty);
if (ipoctal == NULL) {
dev_err(tty->dev, "Device not found. Major %d\n",
tty->driver->major);
return -ENODEV;
}
if (atomic_read(&ipoctal->open[channel]))
return -EBUSY;
res = tty_port_open(&ipoctal->tty_port[channel], tty, file);
if (res)
return res;
atomic_inc(&ipoctal->open[channel]);
return 0;
}
static void ipoctal_reset_stats(struct ipoctal_stats *stats)
{
stats->tx = 0;
stats->rx = 0;
stats->rcv_break = 0;
stats->framing_err = 0;
stats->overrun_err = 0;
stats->parity_err = 0;
}
static void ipoctal_free_channel(struct tty_struct *tty)
{
int channel = tty->index;
struct ipoctal *ipoctal = tty->driver_data;
if (ipoctal == NULL)
return;
ipoctal_reset_stats(&ipoctal->chan_stats[channel]);
ipoctal->pointer_read[channel] = 0;
ipoctal->pointer_write[channel] = 0;
ipoctal->nb_bytes[channel] = 0;
}
static void ipoctal_close(struct tty_struct *tty, struct file *filp)
{
int channel = tty->index;
struct ipoctal *ipoctal = tty->driver_data;
tty_port_close(&ipoctal->tty_port[channel], tty, filp);
if (atomic_dec_and_test(&ipoctal->open[channel]))
ipoctal_free_channel(tty);
}
static int ipoctal_get_icount(struct tty_struct *tty,
struct serial_icounter_struct *icount)
{
struct ipoctal *ipoctal = tty->driver_data;
int channel = tty->index;
icount->cts = 0;
icount->dsr = 0;
icount->rng = 0;
icount->dcd = 0;
icount->rx = ipoctal->chan_stats[channel].rx;
icount->tx = ipoctal->chan_stats[channel].tx;
icount->frame = ipoctal->chan_stats[channel].framing_err;
icount->parity = ipoctal->chan_stats[channel].parity_err;
icount->brk = ipoctal->chan_stats[channel].rcv_break;
return 0;
}
static int ipoctal_irq_handler(void *arg)
{
unsigned int channel;
unsigned int block;
unsigned char isr;
unsigned char sr;
unsigned char isr_tx_rdy, isr_rx_rdy;
unsigned char value;
unsigned char flag;
struct tty_struct *tty;
struct ipoctal *ipoctal = (struct ipoctal *) arg;
/* Check all channels */
for (channel = 0; channel < NR_CHANNELS; channel++) {
/* If there is no client, skip the check */
if (!atomic_read(&ipoctal->open[channel]))
continue;
tty = tty_port_tty_get(&ipoctal->tty_port[channel]);
if (!tty)
continue;
/*
* The HW is organized in pair of channels.
* See which register we need to read from
*/
block = channel / 2;
isr = ipoctal_read_io_reg(ipoctal,
&ipoctal->block_regs[block].u.r.isr);
sr = ipoctal_read_io_reg(ipoctal,
&ipoctal->chan_regs[channel].u.r.sr);
if ((channel % 2) == 1) {
isr_tx_rdy = isr & ISR_TxRDY_B;
isr_rx_rdy = isr & ISR_RxRDY_FFULL_B;
} else {
isr_tx_rdy = isr & ISR_TxRDY_A;
isr_rx_rdy = isr & ISR_RxRDY_FFULL_A;
}
/* In case of RS-485, change from TX to RX when finishing TX.
* Half-duplex.
*/
if ((ipoctal->board_id == IP_OCTAL_485_ID) &&
(sr & SR_TX_EMPTY) &&
(ipoctal->nb_bytes[channel] == 0)) {
ipoctal_write_io_reg(ipoctal,
&ipoctal->chan_regs[channel].u.w.cr,
CR_DISABLE_TX);
ipoctal_write_cr_cmd(ipoctal,
&ipoctal->chan_regs[channel].u.w.cr,
CR_CMD_NEGATE_RTSN);
ipoctal_write_io_reg(ipoctal,
&ipoctal->chan_regs[channel].u.w.cr,
CR_ENABLE_RX);
ipoctal->write = 1;
wake_up_interruptible(&ipoctal->queue[channel]);
}
/* RX data */
if (isr_rx_rdy && (sr & SR_RX_READY)) {
value = ipoctal_read_io_reg(ipoctal,
&ipoctal->chan_regs[channel].u.r.rhr);
flag = TTY_NORMAL;
/* Error: count statistics */
if (sr & SR_ERROR) {
ipoctal_write_cr_cmd(ipoctal,
&ipoctal->chan_regs[channel].u.w.cr,
CR_CMD_RESET_ERR_STATUS);
if (sr & SR_OVERRUN_ERROR) {
ipoctal->error_flag[channel] |= UART_OVERRUN;
ipoctal->chan_stats[channel].overrun_err++;
/* Overrun doesn't affect the current character*/
tty_insert_flip_char(tty, 0, TTY_OVERRUN);
}
if (sr & SR_PARITY_ERROR) {
ipoctal->error_flag[channel] |= UART_PARITY;
ipoctal->chan_stats[channel].parity_err++;
flag = TTY_PARITY;
}
if (sr & SR_FRAMING_ERROR) {
ipoctal->error_flag[channel] |= UART_FRAMING;
ipoctal->chan_stats[channel].framing_err++;
flag = TTY_FRAME;
}
if (sr & SR_RECEIVED_BREAK) {
ipoctal->error_flag[channel] |= UART_BREAK;
ipoctal->chan_stats[channel].rcv_break++;
flag = TTY_BREAK;
}
}
tty_insert_flip_char(tty, value, flag);
}
/* TX of each character */
if (isr_tx_rdy && (sr & SR_TX_READY)) {
unsigned int *pointer_write =
&ipoctal->pointer_write[channel];
if (ipoctal->nb_bytes[channel] <= 0) {
ipoctal->nb_bytes[channel] = 0;
continue;
}
spin_lock(&ipoctal->lock[channel]);
value = ipoctal->buffer[channel][*pointer_write];
ipoctal_write_io_reg(ipoctal,
&ipoctal->chan_regs[channel].u.w.thr,
value);
ipoctal->chan_stats[channel].tx++;
ipoctal->count_wr[channel]++;
(*pointer_write)++;
*pointer_write = *pointer_write % PAGE_SIZE;
ipoctal->nb_bytes[channel]--;
spin_unlock(&ipoctal->lock[channel]);
if ((ipoctal->nb_bytes[channel] == 0) &&
(waitqueue_active(&ipoctal->queue[channel]))) {
if (ipoctal->board_id != IP_OCTAL_485_ID) {
ipoctal->write = 1;
wake_up_interruptible(&ipoctal->queue[channel]);
}
}
}
tty_flip_buffer_push(tty);
tty_kref_put(tty);
}
return IRQ_HANDLED;
}
static int ipoctal_check_model(struct ipack_device *dev, unsigned char *id)
{
unsigned char manufacturerID;
unsigned char board_id;
dev->bus->ops->read8(dev, IPACK_ID_SPACE,
IPACK_IDPROM_OFFSET_MANUFACTURER_ID, &manufacturerID);
if (manufacturerID != IP_OCTAL_MANUFACTURER_ID)
return -ENODEV;
dev->bus->ops->read8(dev, IPACK_ID_SPACE,
IPACK_IDPROM_OFFSET_MODEL, (unsigned char *)&board_id);
switch (board_id) {
case IP_OCTAL_232_ID:
case IP_OCTAL_422_ID:
case IP_OCTAL_485_ID:
*id = board_id;
break;
default:
return -ENODEV;
}
return 0;
}
static const struct tty_port_operations ipoctal_tty_port_ops = {
.dtr_rts = NULL,
.activate = ipoctal_port_activate,
};
static int ipoctal_inst_slot(struct ipoctal *ipoctal, unsigned int bus_nr,
unsigned int slot, unsigned int vector)
{
int res = 0;
int i;
struct tty_driver *tty;
char name[20];
unsigned char board_id;
res = ipoctal->dev->bus->ops->map_space(ipoctal->dev, 0,
IPACK_ID_SPACE);
if (res) {
dev_err(&ipoctal->dev->dev,
"Unable to map slot [%d:%d] ID space!\n",
bus_nr, slot);
return res;
}
res = ipoctal_check_model(ipoctal->dev, &board_id);
if (res) {
ipoctal->dev->bus->ops->unmap_space(ipoctal->dev,
IPACK_ID_SPACE);
goto out_unregister_id_space;
}
ipoctal->board_id = board_id;
res = ipoctal->dev->bus->ops->map_space(ipoctal->dev, 0,
IPACK_IO_SPACE);
if (res) {
dev_err(&ipoctal->dev->dev,
"Unable to map slot [%d:%d] IO space!\n",
bus_nr, slot);
goto out_unregister_id_space;
}
res = ipoctal->dev->bus->ops->map_space(ipoctal->dev,
0x8000, IPACK_MEM_SPACE);
if (res) {
dev_err(&ipoctal->dev->dev,
"Unable to map slot [%d:%d] MEM space!\n",
bus_nr, slot);
goto out_unregister_io_space;
}
/* Save the virtual address to access the registers easily */
ipoctal->chan_regs =
(struct scc2698_channel *) ipoctal->dev->io_space.address;
ipoctal->block_regs =
(struct scc2698_block *) ipoctal->dev->io_space.address;
/* Disable RX and TX before touching anything */
for (i = 0; i < NR_CHANNELS ; i++) {
ipoctal_write_io_reg(ipoctal, &ipoctal->chan_regs[i].u.w.cr,
CR_DISABLE_RX | CR_DISABLE_TX);
}
for (i = 0; i < IP_OCTAL_NB_BLOCKS; i++) {
ipoctal_write_io_reg(ipoctal,
&ipoctal->block_regs[i].u.w.acr,
ACR_BRG_SET2);
ipoctal_write_io_reg(ipoctal,
&ipoctal->block_regs[i].u.w.opcr,
OPCR_MPP_OUTPUT | OPCR_MPOa_RTSN |
OPCR_MPOb_RTSN);
ipoctal_write_io_reg(ipoctal,
&ipoctal->block_regs[i].u.w.imr,
IMR_TxRDY_A | IMR_RxRDY_FFULL_A |
IMR_DELTA_BREAK_A | IMR_TxRDY_B |
IMR_RxRDY_FFULL_B | IMR_DELTA_BREAK_B);
}
/*
* IP-OCTAL has different addresses to copy its IRQ vector.
* Depending of the carrier these addresses are accesible or not.
* More info in the datasheet.
*/
ipoctal->dev->bus->ops->request_irq(ipoctal->dev, vector,
ipoctal_irq_handler, ipoctal);
ipoctal->dev->bus->ops->write8(ipoctal->dev, IPACK_ID_SPACE, 0, vector);
/* Register the TTY device */
/* Each IP-OCTAL channel is a TTY port */
tty = alloc_tty_driver(NR_CHANNELS);
if (!tty) {
res = -ENOMEM;
goto out_unregister_slot_unmap;
}
/* Fill struct tty_driver with ipoctal data */
tty->owner = THIS_MODULE;
tty->driver_name = "ipoctal";
sprintf(name, "ipoctal.%d.%d.", bus_nr, slot);
tty->name = name;
tty->major = 0;
tty->minor_start = 0;
tty->type = TTY_DRIVER_TYPE_SERIAL;
tty->subtype = SERIAL_TYPE_NORMAL;
tty->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
tty->init_termios = tty_std_termios;
tty->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
tty->init_termios.c_ispeed = 9600;
tty->init_termios.c_ospeed = 9600;
tty_set_operations(tty, &ipoctal_fops);
res = tty_register_driver(tty);
if (res) {
dev_err(&ipoctal->dev->dev, "Can't register tty driver.\n");
put_tty_driver(tty);
goto out_unregister_slot_unmap;
}
/* Save struct tty_driver for use it when uninstalling the device */
ipoctal->tty_drv = tty;
for (i = 0; i < NR_CHANNELS; i++) {
tty_port_init(&ipoctal->tty_port[i]);
tty_port_alloc_xmit_buf(&ipoctal->tty_port[i]);
ipoctal->tty_port[i].ops = &ipoctal_tty_port_ops;
ipoctal_reset_stats(&ipoctal->chan_stats[i]);
ipoctal->nb_bytes[i] = 0;
init_waitqueue_head(&ipoctal->queue[i]);
ipoctal->error_flag[i] = UART_NOERROR;
spin_lock_init(&ipoctal->lock[i]);
ipoctal->pointer_read[i] = 0;
ipoctal->pointer_write[i] = 0;
ipoctal->nb_bytes[i] = 0;
tty_register_device(tty, i, NULL);
/*
* Enable again the RX. TX will be enabled when
* there is something to send
*/
ipoctal_write_io_reg(ipoctal, &ipoctal->chan_regs[i].u.w.cr,
CR_ENABLE_RX);
}
return 0;
out_unregister_slot_unmap:
ipoctal->dev->bus->ops->unmap_space(ipoctal->dev, IPACK_ID_SPACE);
out_unregister_io_space:
ipoctal->dev->bus->ops->unmap_space(ipoctal->dev, IPACK_IO_SPACE);
out_unregister_id_space:
ipoctal->dev->bus->ops->unmap_space(ipoctal->dev, IPACK_MEM_SPACE);
return res;
}
static inline int ipoctal_copy_write_buffer(struct ipoctal *ipoctal,
unsigned int channel,
const unsigned char *buf,
int count)
{
unsigned long flags;
int i;
unsigned int *pointer_read = &ipoctal->pointer_read[channel];
/* Copy the bytes from the user buffer to the internal one */
for (i = 0; i < count; i++) {
if (i <= (PAGE_SIZE - ipoctal->nb_bytes[channel])) {
spin_lock_irqsave(&ipoctal->lock[channel], flags);
ipoctal->tty_port[channel].xmit_buf[*pointer_read] = buf[i];
*pointer_read = (*pointer_read + 1) % PAGE_SIZE;
ipoctal->nb_bytes[channel]++;
spin_unlock_irqrestore(&ipoctal->lock[channel], flags);
} else {
break;
}
}
return i;
}
static int ipoctal_write(struct ipoctal *ipoctal, unsigned int channel,
const unsigned char *buf, int count)
{
ipoctal->nb_bytes[channel] = 0;
ipoctal->count_wr[channel] = 0;
ipoctal_copy_write_buffer(ipoctal, channel, buf, count);
ipoctal->error_flag[channel] = UART_NOERROR;
/* As the IP-OCTAL 485 only supports half duplex, do it manually */
if (ipoctal->board_id == IP_OCTAL_485_ID) {
ipoctal_write_io_reg(ipoctal,
&ipoctal->chan_regs[channel].u.w.cr,
CR_DISABLE_RX);
ipoctal_write_cr_cmd(ipoctal,
&ipoctal->chan_regs[channel].u.w.cr,
CR_CMD_ASSERT_RTSN);
}
/*
* Send a packet and then disable TX to avoid failure after several send
* operations
*/
ipoctal_write_io_reg(ipoctal,
&ipoctal->chan_regs[channel].u.w.cr,
CR_ENABLE_TX);
wait_event_interruptible(ipoctal->queue[channel], ipoctal->write);
ipoctal_write_io_reg(ipoctal,
&ipoctal->chan_regs[channel].u.w.cr,
CR_DISABLE_TX);
ipoctal->write = 0;
return ipoctal->count_wr[channel];
}
static int ipoctal_write_tty(struct tty_struct *tty,
const unsigned char *buf, int count)
{
unsigned int channel = tty->index;
struct ipoctal *ipoctal = tty->driver_data;
return ipoctal_write(ipoctal, channel, buf, count);
}
static int ipoctal_write_room(struct tty_struct *tty)
{
int channel = tty->index;
struct ipoctal *ipoctal = tty->driver_data;
return PAGE_SIZE - ipoctal->nb_bytes[channel];
}
static int ipoctal_chars_in_buffer(struct tty_struct *tty)
{
int channel = tty->index;
struct ipoctal *ipoctal = tty->driver_data;
return ipoctal->nb_bytes[channel];
}
static void ipoctal_set_termios(struct tty_struct *tty,
struct ktermios *old_termios)
{
unsigned int cflag;
unsigned char mr1 = 0;
unsigned char mr2 = 0;
unsigned char csr = 0;
unsigned int channel = tty->index;
struct ipoctal *ipoctal = tty->driver_data;
speed_t baud;
cflag = tty->termios->c_cflag;
/* Disable and reset everything before change the setup */
ipoctal_write_io_reg(ipoctal, &ipoctal->chan_regs[channel].u.w.cr,
CR_DISABLE_RX | CR_DISABLE_TX);
ipoctal_write_cr_cmd(ipoctal, &ipoctal->chan_regs[channel].u.w.cr,
CR_CMD_RESET_RX);
ipoctal_write_cr_cmd(ipoctal, &ipoctal->chan_regs[channel].u.w.cr,
CR_CMD_RESET_TX);
ipoctal_write_cr_cmd(ipoctal, &ipoctal->chan_regs[channel].u.w.cr,
CR_CMD_RESET_ERR_STATUS);
ipoctal_write_cr_cmd(ipoctal, &ipoctal->chan_regs[channel].u.w.cr,
CR_CMD_RESET_MR);
/* Set Bits per chars */
switch (cflag & CSIZE) {
case CS6:
mr1 |= MR1_CHRL_6_BITS;
break;
case CS7:
mr1 |= MR1_CHRL_7_BITS;
break;
case CS8:
default:
mr1 |= MR1_CHRL_8_BITS;
/* By default, select CS8 */
tty->termios->c_cflag = (cflag & ~CSIZE) | CS8;
break;
}
/* Set Parity */
if (cflag & PARENB)
if (cflag & PARODD)
mr1 |= MR1_PARITY_ON | MR1_PARITY_ODD;
else
mr1 |= MR1_PARITY_ON | MR1_PARITY_EVEN;
else
mr1 |= MR1_PARITY_OFF;
/* Mark or space parity is not supported */
tty->termios->c_cflag &= ~CMSPAR;
/* Set stop bits */
if (cflag & CSTOPB)
mr2 |= MR2_STOP_BITS_LENGTH_2;
else
mr2 |= MR2_STOP_BITS_LENGTH_1;
/* Set the flow control */
switch (ipoctal->board_id) {
case IP_OCTAL_232_ID:
if (cflag & CRTSCTS) {
mr1 |= MR1_RxRTS_CONTROL_ON;
mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_ON;
ipoctal->chan_config[channel].flow_control = 1;
} else {
mr1 |= MR1_RxRTS_CONTROL_OFF;
mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_OFF;
ipoctal->chan_config[channel].flow_control = 0;
}
break;
case IP_OCTAL_422_ID:
mr1 |= MR1_RxRTS_CONTROL_OFF;
mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_OFF;
ipoctal->chan_config[channel].flow_control = 0;
break;
case IP_OCTAL_485_ID:
mr1 |= MR1_RxRTS_CONTROL_OFF;
mr2 |= MR2_TxRTS_CONTROL_ON | MR2_CTS_ENABLE_TX_OFF;
ipoctal->chan_config[channel].flow_control = 0;
break;
default:
return;
break;
}
baud = tty_get_baud_rate(tty);
tty_termios_encode_baud_rate(tty->termios, baud, baud);
/* Set baud rate */
switch (tty->termios->c_ospeed) {
case 75:
csr |= TX_CLK_75 | RX_CLK_75;
break;
case 110:
csr |= TX_CLK_110 | RX_CLK_110;
break;
case 150:
csr |= TX_CLK_150 | RX_CLK_150;
break;
case 300:
csr |= TX_CLK_300 | RX_CLK_300;
break;
case 600:
csr |= TX_CLK_600 | RX_CLK_600;
break;
case 1200:
csr |= TX_CLK_1200 | RX_CLK_1200;
break;
case 1800:
csr |= TX_CLK_1800 | RX_CLK_1800;
break;
case 2000:
csr |= TX_CLK_2000 | RX_CLK_2000;
break;
case 2400:
csr |= TX_CLK_2400 | RX_CLK_2400;
break;
case 4800:
csr |= TX_CLK_4800 | RX_CLK_4800;
break;
case 9600:
csr |= TX_CLK_9600 | RX_CLK_9600;
break;
case 19200:
csr |= TX_CLK_19200 | RX_CLK_19200;
break;
case 38400:
default:
csr |= TX_CLK_38400 | RX_CLK_38400;
/* In case of default, we establish 38400 bps */
tty_termios_encode_baud_rate(tty->termios, 38400, 38400);
break;
}
mr1 |= MR1_ERROR_CHAR;
mr1 |= MR1_RxINT_RxRDY;
/* Write the control registers */
ipoctal_write_io_reg(ipoctal, &ipoctal->chan_regs[channel].u.w.mr, mr1);
ipoctal_write_io_reg(ipoctal, &ipoctal->chan_regs[channel].u.w.mr, mr2);
ipoctal_write_io_reg(ipoctal, &ipoctal->chan_regs[channel].u.w.csr, csr);
/* save the setup in the structure */
ipoctal->chan_config[channel].baud = tty_get_baud_rate(tty);
ipoctal->chan_config[channel].bits_per_char = cflag & CSIZE;
ipoctal->chan_config[channel].parity = cflag & PARENB;
ipoctal->chan_config[channel].stop_bits = cflag & CSTOPB;
/* Enable again the RX */
ipoctal_write_io_reg(ipoctal, &ipoctal->chan_regs[channel].u.w.cr,
CR_ENABLE_RX);
}
static void ipoctal_hangup(struct tty_struct *tty)
{
unsigned long flags;
int channel = tty->index;
struct ipoctal *ipoctal = tty->driver_data;
if (ipoctal == NULL)
return;
spin_lock_irqsave(&ipoctal->lock[channel], flags);
ipoctal->nb_bytes[channel] = 0;
ipoctal->pointer_read[channel] = 0;
ipoctal->pointer_write[channel] = 0;
spin_unlock_irqrestore(&ipoctal->lock[channel], flags);
tty_port_hangup(&ipoctal->tty_port[channel]);
ipoctal_write_io_reg(ipoctal, &ipoctal->chan_regs[channel].u.w.cr,
CR_DISABLE_RX | CR_DISABLE_TX);
ipoctal_write_cr_cmd(ipoctal, &ipoctal->chan_regs[channel].u.w.cr,
CR_CMD_RESET_RX);
ipoctal_write_cr_cmd(ipoctal, &ipoctal->chan_regs[channel].u.w.cr,
CR_CMD_RESET_TX);
ipoctal_write_cr_cmd(ipoctal, &ipoctal->chan_regs[channel].u.w.cr,
CR_CMD_RESET_ERR_STATUS);
ipoctal_write_cr_cmd(ipoctal, &ipoctal->chan_regs[channel].u.w.cr,
CR_CMD_RESET_MR);
clear_bit(ASYNCB_INITIALIZED, &ipoctal->tty_port[channel].flags);
wake_up_interruptible(&ipoctal->tty_port[channel].open_wait);
}
static const struct tty_operations ipoctal_fops = {
.ioctl = NULL,
.open = ipoctal_open,
.close = ipoctal_close,
.write = ipoctal_write_tty,
.set_termios = ipoctal_set_termios,
.write_room = ipoctal_write_room,
.chars_in_buffer = ipoctal_chars_in_buffer,
.get_icount = ipoctal_get_icount,
.hangup = ipoctal_hangup,
};
static int ipoctal_match(struct ipack_device *dev)
{
int res;
unsigned char board_id;
if ((!dev->bus->ops) || (!dev->bus->ops->map_space) ||
(!dev->bus->ops->unmap_space))
return 0;
res = dev->bus->ops->map_space(dev, 0, IPACK_ID_SPACE);
if (res)
return 0;
res = ipoctal_check_model(dev, &board_id);
dev->bus->ops->unmap_space(dev, IPACK_ID_SPACE);
if (!res)
return 1;
return 0;
}
static int ipoctal_probe(struct ipack_device *dev)
{
int res;
struct ipoctal *ipoctal;
ipoctal = kzalloc(sizeof(struct ipoctal), GFP_KERNEL);
if (ipoctal == NULL)
return -ENOMEM;
ipoctal->dev = dev;
res = ipoctal_inst_slot(ipoctal, dev->bus_nr, dev->slot, dev->irq);
if (res)
goto out_uninst;
list_add_tail(&ipoctal->list, &ipoctal_list);
return 0;
out_uninst:
kfree(ipoctal);
return res;
}
static void __ipoctal_remove(struct ipoctal *ipoctal)
{
int i;
for (i = 0; i < NR_CHANNELS; i++) {
tty_unregister_device(ipoctal->tty_drv, i);
tty_port_free_xmit_buf(&ipoctal->tty_port[i]);
}
tty_unregister_driver(ipoctal->tty_drv);
put_tty_driver(ipoctal->tty_drv);
list_del(&ipoctal->list);
kfree(ipoctal);
}
static void ipoctal_remove(struct ipack_device *device)
{
struct ipoctal *ipoctal, *next;
list_for_each_entry_safe(ipoctal, next, &ipoctal_list, list) {
if (ipoctal->dev == device)
__ipoctal_remove(ipoctal);
}
}
static struct ipack_driver_ops ipoctal_drv_ops = {
.match = ipoctal_match,
.probe = ipoctal_probe,
.remove = ipoctal_remove,
};
static int __init ipoctal_init(void)
{
driver.ops = &ipoctal_drv_ops;
return ipack_driver_register(&driver, THIS_MODULE, KBUILD_MODNAME);
}
static void __exit ipoctal_exit(void)
{
struct ipoctal *p, *next;
list_for_each_entry_safe(p, next, &ipoctal_list, list)
p->dev->bus->ops->remove_device(p->dev);
ipack_driver_unregister(&driver);
}
MODULE_DESCRIPTION("IP-Octal 232, 422 and 485 device driver");
MODULE_LICENSE("GPL");
module_init(ipoctal_init);
module_exit(ipoctal_exit);
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