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android_kernel_xiaomi_sm8350/drivers/net/wan/pc300_tty.c
Eric Dumazet 807540baae drivers/net: return operator cleanup 
Change "return (EXPR);" to "return EXPR;"

return is not a function, parentheses are not required.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2010-09-26 18:34:29 -07:00

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/*
* pc300_tty.c Cyclades-PC300(tm) TTY Driver.
*
* Author: Regina Kodato <reginak@cyclades.com>
*
* Copyright: (c) 1999-2002 Cyclades Corp.
*
* 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; either version
* 2 of the License, or (at your option) any later version.
*
* $Log: pc300_tty.c,v $
* Revision 3.7 2002/03/07 14:17:09 henrique
* License data fixed
*
* Revision 3.6 2001/12/10 12:29:42 regina
* Fix the MLPPP bug
*
* Revision 3.5 2001/10/31 11:20:05 regina
* automatic pppd starts
*
* Revision 3.4 2001/08/06 12:01:51 regina
* problem in DSR_DE bit
*
* Revision 3.3 2001/07/26 22:58:41 regina
* update EDA value
*
* Revision 3.2 2001/07/12 13:11:20 regina
* bug fix - DCD-OFF in pc300 tty driver
*
* DMA transmission bug fix
*
* Revision 3.1 2001/06/22 13:13:02 regina
* MLPPP implementation
*
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/if.h>
#include <linux/skbuff.h>
/* TTY includes */
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include "pc300.h"
/* defines and macros */
/* TTY Global definitions */
#define CPC_TTY_NPORTS 8 /* maximum number of the sync tty connections */
#define CPC_TTY_MAJOR CYCLADES_MAJOR
#define CPC_TTY_MINOR_START 240 /* minor of the first PC300 interface */
#define CPC_TTY_MAX_MTU 2000
/* tty interface state */
#define CPC_TTY_ST_IDLE 0
#define CPC_TTY_ST_INIT 1 /* configured with MLPPP and up */
#define CPC_TTY_ST_OPEN 2 /* opened by application */
#define CPC_TTY_LOCK(card,flags)\
do {\
spin_lock_irqsave(&card->card_lock, flags); \
} while (0)
#define CPC_TTY_UNLOCK(card,flags) \
do {\
spin_unlock_irqrestore(&card->card_lock, flags); \
} while (0)
//#define CPC_TTY_DBG(format,a...) printk(format,##a)
#define CPC_TTY_DBG(format,a...)
/* data structures */
typedef struct _st_cpc_rx_buf {
struct _st_cpc_rx_buf *next;
int size;
unsigned char data[1];
} st_cpc_rx_buf;
struct st_cpc_rx_list {
st_cpc_rx_buf *first;
st_cpc_rx_buf *last;
};
typedef struct _st_cpc_tty_area {
int state; /* state of the TTY interface */
int num_open;
unsigned int tty_minor; /* minor this interface */
volatile struct st_cpc_rx_list buf_rx; /* ptr. to reception buffer */
unsigned char* buf_tx; /* ptr. to transmission buffer */
pc300dev_t* pc300dev; /* ptr. to info struct in PC300 driver */
unsigned char name[20]; /* interf. name + "-tty" */
struct tty_struct *tty;
struct work_struct tty_tx_work; /* tx work - tx interrupt */
struct work_struct tty_rx_work; /* rx work - rx interrupt */
} st_cpc_tty_area;
/* TTY data structures */
static struct tty_driver serial_drv;
/* local variables */
static st_cpc_tty_area cpc_tty_area[CPC_TTY_NPORTS];
static int cpc_tty_cnt = 0; /* number of intrfaces configured with MLPPP */
static int cpc_tty_unreg_flag = 0;
/* TTY functions prototype */
static int cpc_tty_open(struct tty_struct *tty, struct file *flip);
static void cpc_tty_close(struct tty_struct *tty, struct file *flip);
static int cpc_tty_write(struct tty_struct *tty, const unsigned char *buf, int count);
static int cpc_tty_write_room(struct tty_struct *tty);
static int cpc_tty_chars_in_buffer(struct tty_struct *tty);
static void cpc_tty_flush_buffer(struct tty_struct *tty);
static void cpc_tty_hangup(struct tty_struct *tty);
static void cpc_tty_rx_work(struct work_struct *work);
static void cpc_tty_tx_work(struct work_struct *work);
static int cpc_tty_send_to_card(pc300dev_t *dev,void *buf, int len);
static void cpc_tty_trace(pc300dev_t *dev, char* buf, int len, char rxtx);
static void cpc_tty_signal_off(pc300dev_t *pc300dev, unsigned char);
static void cpc_tty_signal_on(pc300dev_t *pc300dev, unsigned char);
static int pc300_tiocmset(struct tty_struct *, struct file *,
unsigned int, unsigned int);
static int pc300_tiocmget(struct tty_struct *, struct file *);
/* functions called by PC300 driver */
void cpc_tty_init(pc300dev_t *dev);
void cpc_tty_unregister_service(pc300dev_t *pc300dev);
void cpc_tty_receive(pc300dev_t *pc300dev);
void cpc_tty_trigger_poll(pc300dev_t *pc300dev);
void cpc_tty_reset_var(void);
/*
* PC300 TTY clear "signal"
*/
static void cpc_tty_signal_off(pc300dev_t *pc300dev, unsigned char signal)
{
pc300ch_t *pc300chan = (pc300ch_t *)pc300dev->chan;
pc300_t *card = (pc300_t *) pc300chan->card;
int ch = pc300chan->channel;
unsigned long flags;
CPC_TTY_DBG("%s-tty: Clear signal %x\n",
pc300dev->dev->name, signal);
CPC_TTY_LOCK(card, flags);
cpc_writeb(card->hw.scabase + M_REG(CTL,ch),
cpc_readb(card->hw.scabase+M_REG(CTL,ch))& signal);
CPC_TTY_UNLOCK(card,flags);
}
/*
* PC300 TTY set "signal" to ON
*/
static void cpc_tty_signal_on(pc300dev_t *pc300dev, unsigned char signal)
{
pc300ch_t *pc300chan = (pc300ch_t *)pc300dev->chan;
pc300_t *card = (pc300_t *) pc300chan->card;
int ch = pc300chan->channel;
unsigned long flags;
CPC_TTY_DBG("%s-tty: Set signal %x\n",
pc300dev->dev->name, signal);
CPC_TTY_LOCK(card, flags);
cpc_writeb(card->hw.scabase + M_REG(CTL,ch),
cpc_readb(card->hw.scabase+M_REG(CTL,ch))& ~signal);
CPC_TTY_UNLOCK(card,flags);
}
static const struct tty_operations pc300_ops = {
.open = cpc_tty_open,
.close = cpc_tty_close,
.write = cpc_tty_write,
.write_room = cpc_tty_write_room,
.chars_in_buffer = cpc_tty_chars_in_buffer,
.tiocmset = pc300_tiocmset,
.tiocmget = pc300_tiocmget,
.flush_buffer = cpc_tty_flush_buffer,
.hangup = cpc_tty_hangup,
};
/*
* PC300 TTY initialization routine
*
* This routine is called by the PC300 driver during board configuration
* (ioctl=SIOCSP300CONF). At this point the adapter is completely
* initialized.
* o verify kernel version (only 2.4.x)
* o register TTY driver
* o init cpc_tty_area struct
*/
void cpc_tty_init(pc300dev_t *pc300dev)
{
unsigned long port;
int aux;
st_cpc_tty_area * cpc_tty;
/* hdlcX - X=interface number */
port = pc300dev->dev->name[4] - '0';
if (port >= CPC_TTY_NPORTS) {
printk("%s-tty: invalid interface selected (0-%i): %li",
pc300dev->dev->name,
CPC_TTY_NPORTS-1,port);
return;
}
if (cpc_tty_cnt == 0) { /* first TTY connection -> register driver */
CPC_TTY_DBG("%s-tty: driver init, major:%i, minor range:%i=%i\n",
pc300dev->dev->name,
CPC_TTY_MAJOR, CPC_TTY_MINOR_START,
CPC_TTY_MINOR_START+CPC_TTY_NPORTS);
/* initialize tty driver struct */
memset(&serial_drv,0,sizeof(struct tty_driver));
serial_drv.magic = TTY_DRIVER_MAGIC;
serial_drv.owner = THIS_MODULE;
serial_drv.driver_name = "pc300_tty";
serial_drv.name = "ttyCP";
serial_drv.major = CPC_TTY_MAJOR;
serial_drv.minor_start = CPC_TTY_MINOR_START;
serial_drv.num = CPC_TTY_NPORTS;
serial_drv.type = TTY_DRIVER_TYPE_SERIAL;
serial_drv.subtype = SERIAL_TYPE_NORMAL;
serial_drv.init_termios = tty_std_termios;
serial_drv.init_termios.c_cflag = B9600|CS8|CREAD|HUPCL|CLOCAL;
serial_drv.flags = TTY_DRIVER_REAL_RAW;
/* interface routines from the upper tty layer to the tty driver */
tty_set_operations(&serial_drv, &pc300_ops);
/* register the TTY driver */
if (tty_register_driver(&serial_drv)) {
printk("%s-tty: Failed to register serial driver! ",
pc300dev->dev->name);
return;
}
memset((void *)cpc_tty_area, 0,
sizeof(st_cpc_tty_area) * CPC_TTY_NPORTS);
}
cpc_tty = &cpc_tty_area[port];
if (cpc_tty->state != CPC_TTY_ST_IDLE) {
CPC_TTY_DBG("%s-tty: TTY port %i, already in use.\n",
pc300dev->dev->name, port);
return;
}
cpc_tty_cnt++;
cpc_tty->state = CPC_TTY_ST_INIT;
cpc_tty->num_open= 0;
cpc_tty->tty_minor = port + CPC_TTY_MINOR_START;
cpc_tty->pc300dev = pc300dev;
INIT_WORK(&cpc_tty->tty_tx_work, cpc_tty_tx_work);
INIT_WORK(&cpc_tty->tty_rx_work, cpc_tty_rx_work);
cpc_tty->buf_rx.first = cpc_tty->buf_rx.last = NULL;
pc300dev->cpc_tty = (void *)cpc_tty;
aux = strlen(pc300dev->dev->name);
memcpy(cpc_tty->name, pc300dev->dev->name, aux);
memcpy(&cpc_tty->name[aux], "-tty", 5);
cpc_open(pc300dev->dev);
cpc_tty_signal_off(pc300dev, CTL_DTR);
CPC_TTY_DBG("%s: Initializing TTY Sync Driver, tty major#%d minor#%i\n",
cpc_tty->name,CPC_TTY_MAJOR,cpc_tty->tty_minor);
return;
}
/*
* PC300 TTY OPEN routine
*
* This routine is called by the tty driver to open the interface
* o verify minor
* o allocate buffer to Rx and Tx
*/
static int cpc_tty_open(struct tty_struct *tty, struct file *flip)
{
int port ;
st_cpc_tty_area *cpc_tty;
if (!tty) {
return -ENODEV;
}
port = tty->index;
if ((port < 0) || (port >= CPC_TTY_NPORTS)){
CPC_TTY_DBG("pc300_tty: open invalid port %d\n", port);
return -ENODEV;
}
cpc_tty = &cpc_tty_area[port];
if (cpc_tty->state == CPC_TTY_ST_IDLE){
CPC_TTY_DBG("%s: open - invalid interface, port=%d\n",
cpc_tty->name, tty->index);
return -ENODEV;
}
if (cpc_tty->num_open == 0) { /* first open of this tty */
if (!cpc_tty_area[port].buf_tx){
cpc_tty_area[port].buf_tx = kmalloc(CPC_TTY_MAX_MTU,GFP_KERNEL);
if (!cpc_tty_area[port].buf_tx) {
CPC_TTY_DBG("%s: error in memory allocation\n",cpc_tty->name);
return -ENOMEM;
}
}
if (cpc_tty_area[port].buf_rx.first) {
unsigned char * aux;
while (cpc_tty_area[port].buf_rx.first) {
aux = (unsigned char *)cpc_tty_area[port].buf_rx.first;
cpc_tty_area[port].buf_rx.first = cpc_tty_area[port].buf_rx.first->next;
kfree(aux);
}
cpc_tty_area[port].buf_rx.first = NULL;
cpc_tty_area[port].buf_rx.last = NULL;
}
cpc_tty_area[port].state = CPC_TTY_ST_OPEN;
cpc_tty_area[port].tty = tty;
tty->driver_data = &cpc_tty_area[port];
cpc_tty_signal_on(cpc_tty->pc300dev, CTL_DTR);
}
cpc_tty->num_open++;
CPC_TTY_DBG("%s: opening TTY driver\n", cpc_tty->name);
/* avisar driver PC300 */
return 0;
}
/*
* PC300 TTY CLOSE routine
*
* This routine is called by the tty driver to close the interface
* o call close channel in PC300 driver (cpc_closech)
* o free Rx and Tx buffers
*/
static void cpc_tty_close(struct tty_struct *tty, struct file *flip)
{
st_cpc_tty_area *cpc_tty;
unsigned long flags;
int res;
if (!tty || !tty->driver_data ) {
CPC_TTY_DBG("hdlx-tty: no TTY in close\n");
return;
}
cpc_tty = (st_cpc_tty_area *) tty->driver_data;
if ((cpc_tty->tty != tty)|| (cpc_tty->state != CPC_TTY_ST_OPEN)) {
CPC_TTY_DBG("%s: TTY is not opened\n",cpc_tty->name);
return;
}
if (!cpc_tty->num_open) {
CPC_TTY_DBG("%s: TTY is closed\n",cpc_tty->name);
return;
}
if (--cpc_tty->num_open > 0) {
CPC_TTY_DBG("%s: TTY closed\n",cpc_tty->name);
return;
}
cpc_tty_signal_off(cpc_tty->pc300dev, CTL_DTR);
CPC_TTY_LOCK(cpc_tty->pc300dev->chan->card, flags); /* lock irq */
cpc_tty->tty = NULL;
cpc_tty->state = CPC_TTY_ST_INIT;
CPC_TTY_UNLOCK(cpc_tty->pc300dev->chan->card, flags); /* unlock irq */
if (cpc_tty->buf_rx.first) {
unsigned char * aux;
while (cpc_tty->buf_rx.first) {
aux = (unsigned char *)cpc_tty->buf_rx.first;
cpc_tty->buf_rx.first = cpc_tty->buf_rx.first->next;
kfree(aux);
}
cpc_tty->buf_rx.first = NULL;
cpc_tty->buf_rx.last = NULL;
}
kfree(cpc_tty->buf_tx);
cpc_tty->buf_tx = NULL;
CPC_TTY_DBG("%s: TTY closed\n",cpc_tty->name);
if (!serial_drv.refcount && cpc_tty_unreg_flag) {
cpc_tty_unreg_flag = 0;
CPC_TTY_DBG("%s: unregister the tty driver\n", cpc_tty->name);
if ((res=tty_unregister_driver(&serial_drv))) {
CPC_TTY_DBG("%s: ERROR ->unregister the tty driver error=%d\n",
cpc_tty->name,res);
}
}
return;
}
/*
* PC300 TTY WRITE routine
*
* This routine is called by the tty driver to write a series of characters
* to the tty device. The characters may come from user or kernel space.
* o verify the DCD signal
* o send characters to board and start the transmission
*/
static int cpc_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
{
st_cpc_tty_area *cpc_tty;
pc300ch_t *pc300chan;
pc300_t *card;
int ch;
unsigned long flags;
struct net_device_stats *stats;
if (!tty || !tty->driver_data ) {
CPC_TTY_DBG("hdlcX-tty: no TTY in write\n");
return -ENODEV;
}
cpc_tty = (st_cpc_tty_area *) tty->driver_data;
if ((cpc_tty->tty != tty) || (cpc_tty->state != CPC_TTY_ST_OPEN)) {
CPC_TTY_DBG("%s: TTY is not opened\n", cpc_tty->name);
return -ENODEV;
}
if (count > CPC_TTY_MAX_MTU) {
CPC_TTY_DBG("%s: count is invalid\n",cpc_tty->name);
return -EINVAL; /* frame too big */
}
CPC_TTY_DBG("%s: cpc_tty_write data len=%i\n",cpc_tty->name,count);
pc300chan = (pc300ch_t *)((pc300dev_t*)cpc_tty->pc300dev)->chan;
stats = &cpc_tty->pc300dev->dev->stats;
card = (pc300_t *) pc300chan->card;
ch = pc300chan->channel;
/* verify DCD signal*/
if (cpc_readb(card->hw.scabase + M_REG(ST3,ch)) & ST3_DCD) {
/* DCD is OFF */
CPC_TTY_DBG("%s : DCD is OFF\n", cpc_tty->name);
stats->tx_errors++;
stats->tx_carrier_errors++;
CPC_TTY_LOCK(card, flags);
cpc_writeb(card->hw.scabase + M_REG(CMD, ch), CMD_TX_BUF_CLR);
if (card->hw.type == PC300_TE) {
cpc_writeb(card->hw.falcbase + card->hw.cpld_reg2,
cpc_readb(card->hw.falcbase + card->hw.cpld_reg2) &
~(CPLD_REG2_FALC_LED1 << (2 *ch)));
}
CPC_TTY_UNLOCK(card, flags);
return -EINVAL;
}
if (cpc_tty_send_to_card(cpc_tty->pc300dev, (void*)buf, count)) {
/* failed to send */
CPC_TTY_DBG("%s: trasmition error\n", cpc_tty->name);
return 0;
}
return count;
}
/*
* PC300 TTY Write Room routine
*
* This routine returns the numbers of characteres the tty driver will accept
* for queuing to be written.
* o return MTU
*/
static int cpc_tty_write_room(struct tty_struct *tty)
{
st_cpc_tty_area *cpc_tty;
if (!tty || !tty->driver_data ) {
CPC_TTY_DBG("hdlcX-tty: no TTY to write room\n");
return -ENODEV;
}
cpc_tty = (st_cpc_tty_area *) tty->driver_data;
if ((cpc_tty->tty != tty) || (cpc_tty->state != CPC_TTY_ST_OPEN)) {
CPC_TTY_DBG("%s: TTY is not opened\n",cpc_tty->name);
return -ENODEV;
}
CPC_TTY_DBG("%s: write room\n",cpc_tty->name);
return CPC_TTY_MAX_MTU;
}
/*
* PC300 TTY chars in buffer routine
*
* This routine returns the chars number in the transmission buffer
* o returns 0
*/
static int cpc_tty_chars_in_buffer(struct tty_struct *tty)
{
st_cpc_tty_area *cpc_tty;
if (!tty || !tty->driver_data ) {
CPC_TTY_DBG("hdlcX-tty: no TTY to chars in buffer\n");
return -ENODEV;
}
cpc_tty = (st_cpc_tty_area *) tty->driver_data;
if ((cpc_tty->tty != tty) || (cpc_tty->state != CPC_TTY_ST_OPEN)) {
CPC_TTY_DBG("%s: TTY is not opened\n",cpc_tty->name);
return -ENODEV;
}
return 0;
}
static int pc300_tiocmset(struct tty_struct *tty, struct file *file,
unsigned int set, unsigned int clear)
{
st_cpc_tty_area *cpc_tty;
CPC_TTY_DBG("%s: set:%x clear:%x\n", __func__, set, clear);
if (!tty || !tty->driver_data ) {
CPC_TTY_DBG("hdlcX-tty: no TTY to chars in buffer\n");
return -ENODEV;
}
cpc_tty = (st_cpc_tty_area *) tty->driver_data;
if (set & TIOCM_RTS)
cpc_tty_signal_on(cpc_tty->pc300dev, CTL_RTS);
if (set & TIOCM_DTR)
cpc_tty_signal_on(cpc_tty->pc300dev, CTL_DTR);
if (clear & TIOCM_RTS)
cpc_tty_signal_off(cpc_tty->pc300dev, CTL_RTS);
if (clear & TIOCM_DTR)
cpc_tty_signal_off(cpc_tty->pc300dev, CTL_DTR);
return 0;
}
static int pc300_tiocmget(struct tty_struct *tty, struct file *file)
{
unsigned int result;
unsigned char status;
unsigned long flags;
st_cpc_tty_area *cpc_tty = (st_cpc_tty_area *) tty->driver_data;
pc300dev_t *pc300dev = cpc_tty->pc300dev;
pc300ch_t *pc300chan = (pc300ch_t *)pc300dev->chan;
pc300_t *card = (pc300_t *) pc300chan->card;
int ch = pc300chan->channel;
cpc_tty = (st_cpc_tty_area *) tty->driver_data;
CPC_TTY_DBG("%s-tty: tiocmget\n",
((struct net_device*)(pc300dev->hdlc))->name);
CPC_TTY_LOCK(card, flags);
status = cpc_readb(card->hw.scabase+M_REG(CTL,ch));
CPC_TTY_UNLOCK(card,flags);
result = ((status & CTL_DTR) ? TIOCM_DTR : 0) |
((status & CTL_RTS) ? TIOCM_RTS : 0);
return result;
}
/*
* PC300 TTY Flush Buffer routine
*
* This routine resets the transmission buffer
*/
static void cpc_tty_flush_buffer(struct tty_struct *tty)
{
st_cpc_tty_area *cpc_tty;
if (!tty || !tty->driver_data ) {
CPC_TTY_DBG("hdlcX-tty: no TTY to flush buffer\n");
return;
}
cpc_tty = (st_cpc_tty_area *) tty->driver_data;
if ((cpc_tty->tty != tty) || (cpc_tty->state != CPC_TTY_ST_OPEN)) {
CPC_TTY_DBG("%s: TTY is not opened\n",cpc_tty->name);
return;
}
CPC_TTY_DBG("%s: call wake_up_interruptible\n",cpc_tty->name);
tty_wakeup(tty);
return;
}
/*
* PC300 TTY Hangup routine
*
* This routine is called by the tty driver to hangup the interface
* o clear DTR signal
*/
static void cpc_tty_hangup(struct tty_struct *tty)
{
st_cpc_tty_area *cpc_tty;
int res;
if (!tty || !tty->driver_data ) {
CPC_TTY_DBG("hdlcX-tty: no TTY to hangup\n");
return ;
}
cpc_tty = (st_cpc_tty_area *) tty->driver_data;
if ((cpc_tty->tty != tty) || (cpc_tty->state != CPC_TTY_ST_OPEN)) {
CPC_TTY_DBG("%s: TTY is not opened\n",cpc_tty->name);
return ;
}
if (!serial_drv.refcount && cpc_tty_unreg_flag) {
cpc_tty_unreg_flag = 0;
CPC_TTY_DBG("%s: unregister the tty driver\n", cpc_tty->name);
if ((res=tty_unregister_driver(&serial_drv))) {
CPC_TTY_DBG("%s: ERROR ->unregister the tty driver error=%d\n",
cpc_tty->name,res);
}
}
cpc_tty_signal_off(cpc_tty->pc300dev, CTL_DTR);
}
/*
* PC300 TTY RX work routine
* This routine treats RX work
* o verify read buffer
* o call the line disc. read
* o free memory
*/
static void cpc_tty_rx_work(struct work_struct *work)
{
st_cpc_tty_area *cpc_tty;
unsigned long port;
int i, j;
volatile st_cpc_rx_buf *buf;
char flags=0,flg_rx=1;
struct tty_ldisc *ld;
if (cpc_tty_cnt == 0) return;
for (i=0; (i < 4) && flg_rx ; i++) {
flg_rx = 0;
cpc_tty = container_of(work, st_cpc_tty_area, tty_rx_work);
port = cpc_tty - cpc_tty_area;
for (j=0; j < CPC_TTY_NPORTS; j++) {
cpc_tty = &cpc_tty_area[port];
if ((buf=cpc_tty->buf_rx.first) != NULL) {
if (cpc_tty->tty) {
ld = tty_ldisc_ref(cpc_tty->tty);
if (ld) {
if (ld->ops->receive_buf) {
CPC_TTY_DBG("%s: call line disc. receive_buf\n",cpc_tty->name);
ld->ops->receive_buf(cpc_tty->tty, (char *)(buf->data), &flags, buf->size);
}
tty_ldisc_deref(ld);
}
}
cpc_tty->buf_rx.first = cpc_tty->buf_rx.first->next;
kfree((void *)buf);
buf = cpc_tty->buf_rx.first;
flg_rx = 1;
}
if (++port == CPC_TTY_NPORTS) port = 0;
}
}
}
/*
* PC300 TTY RX work routine
*
* This routine treats RX interrupt.
* o read all frames in card
* o verify the frame size
* o read the frame in rx buffer
*/
static void cpc_tty_rx_disc_frame(pc300ch_t *pc300chan)
{
volatile pcsca_bd_t __iomem * ptdescr;
volatile unsigned char status;
pc300_t *card = (pc300_t *)pc300chan->card;
int ch = pc300chan->channel;
/* dma buf read */
ptdescr = (pcsca_bd_t __iomem *)(card->hw.rambase +
RX_BD_ADDR(ch, pc300chan->rx_first_bd));
while (pc300chan->rx_first_bd != pc300chan->rx_last_bd) {
status = cpc_readb(&ptdescr->status);
cpc_writeb(&ptdescr->status, 0);
cpc_writeb(&ptdescr->len, 0);
pc300chan->rx_first_bd = (pc300chan->rx_first_bd + 1) &
(N_DMA_RX_BUF - 1);
if (status & DST_EOM) {
break; /* end of message */
}
ptdescr = (pcsca_bd_t __iomem *)(card->hw.rambase + cpc_readl(&ptdescr->next));
}
}
void cpc_tty_receive(pc300dev_t *pc300dev)
{
st_cpc_tty_area *cpc_tty;
pc300ch_t *pc300chan = (pc300ch_t *)pc300dev->chan;
pc300_t *card = (pc300_t *)pc300chan->card;
int ch = pc300chan->channel;
volatile pcsca_bd_t __iomem * ptdescr;
struct net_device_stats *stats = &pc300dev->dev->stats;
int rx_len, rx_aux;
volatile unsigned char status;
unsigned short first_bd = pc300chan->rx_first_bd;
st_cpc_rx_buf *new = NULL;
unsigned char dsr_rx;
if (pc300dev->cpc_tty == NULL) {
return;
}
dsr_rx = cpc_readb(card->hw.scabase + DSR_RX(ch));
cpc_tty = (st_cpc_tty_area *)pc300dev->cpc_tty;
while (1) {
rx_len = 0;
ptdescr = (pcsca_bd_t __iomem *)(card->hw.rambase + RX_BD_ADDR(ch, first_bd));
while ((status = cpc_readb(&ptdescr->status)) & DST_OSB) {
rx_len += cpc_readw(&ptdescr->len);
first_bd = (first_bd + 1) & (N_DMA_RX_BUF - 1);
if (status & DST_EOM) {
break;
}
ptdescr = (pcsca_bd_t __iomem *)(card->hw.rambase+cpc_readl(&ptdescr->next));
}
if (!rx_len) {
if (dsr_rx & DSR_BOF) {
/* update EDA */
cpc_writel(card->hw.scabase + DRX_REG(EDAL, ch),
RX_BD_ADDR(ch, pc300chan->rx_last_bd));
}
kfree(new);
return;
}
if (rx_len > CPC_TTY_MAX_MTU) {
/* Free RX descriptors */
CPC_TTY_DBG("%s: frame size is invalid.\n",cpc_tty->name);
stats->rx_errors++;
stats->rx_frame_errors++;
cpc_tty_rx_disc_frame(pc300chan);
continue;
}
new = kmalloc(rx_len + sizeof(st_cpc_rx_buf), GFP_ATOMIC);
if (!new) {
cpc_tty_rx_disc_frame(pc300chan);
continue;
}
/* dma buf read */
ptdescr = (pcsca_bd_t __iomem *)(card->hw.rambase +
RX_BD_ADDR(ch, pc300chan->rx_first_bd));
rx_len = 0; /* counter frame size */
while ((status = cpc_readb(&ptdescr->status)) & DST_OSB) {
rx_aux = cpc_readw(&ptdescr->len);
if ((status & (DST_OVR | DST_CRC | DST_RBIT | DST_SHRT | DST_ABT))
|| (rx_aux > BD_DEF_LEN)) {
CPC_TTY_DBG("%s: reception error\n", cpc_tty->name);
stats->rx_errors++;
if (status & DST_OVR) {
stats->rx_fifo_errors++;
}
if (status & DST_CRC) {
stats->rx_crc_errors++;
}
if ((status & (DST_RBIT | DST_SHRT | DST_ABT)) ||
(rx_aux > BD_DEF_LEN)) {
stats->rx_frame_errors++;
}
/* discard remainig descriptors used by the bad frame */
CPC_TTY_DBG("%s: reception error - discard descriptors",
cpc_tty->name);
cpc_tty_rx_disc_frame(pc300chan);
rx_len = 0;
kfree(new);
new = NULL;
break; /* read next frame - while(1) */
}
if (cpc_tty->state != CPC_TTY_ST_OPEN) {
/* Free RX descriptors */
cpc_tty_rx_disc_frame(pc300chan);
stats->rx_dropped++;
rx_len = 0;
kfree(new);
new = NULL;
break; /* read next frame - while(1) */
}
/* read the segment of the frame */
if (rx_aux != 0) {
memcpy_fromio((new->data + rx_len),
(void __iomem *)(card->hw.rambase +
cpc_readl(&ptdescr->ptbuf)), rx_aux);
rx_len += rx_aux;
}
cpc_writeb(&ptdescr->status,0);
cpc_writeb(&ptdescr->len, 0);
pc300chan->rx_first_bd = (pc300chan->rx_first_bd + 1) &
(N_DMA_RX_BUF -1);
if (status & DST_EOM)break;
ptdescr = (pcsca_bd_t __iomem *) (card->hw.rambase +
cpc_readl(&ptdescr->next));
}
/* update pointer */
pc300chan->rx_last_bd = (pc300chan->rx_first_bd - 1) &
(N_DMA_RX_BUF - 1) ;
if (!(dsr_rx & DSR_BOF)) {
/* update EDA */
cpc_writel(card->hw.scabase + DRX_REG(EDAL, ch),
RX_BD_ADDR(ch, pc300chan->rx_last_bd));
}
if (rx_len != 0) {
stats->rx_bytes += rx_len;
if (pc300dev->trace_on) {
cpc_tty_trace(pc300dev, new->data,rx_len, 'R');
}
new->size = rx_len;
new->next = NULL;
if (cpc_tty->buf_rx.first == NULL) {
cpc_tty->buf_rx.first = new;
cpc_tty->buf_rx.last = new;
} else {
cpc_tty->buf_rx.last->next = new;
cpc_tty->buf_rx.last = new;
}
schedule_work(&(cpc_tty->tty_rx_work));
stats->rx_packets++;
}
}
}
/*
* PC300 TTY TX work routine
*
* This routine treats TX interrupt.
* o if need call line discipline wakeup
* o call wake_up_interruptible
*/
static void cpc_tty_tx_work(struct work_struct *work)
{
st_cpc_tty_area *cpc_tty =
container_of(work, st_cpc_tty_area, tty_tx_work);
struct tty_struct *tty;
CPC_TTY_DBG("%s: cpc_tty_tx_work init\n",cpc_tty->name);
if ((tty = cpc_tty->tty) == NULL) {
CPC_TTY_DBG("%s: the interface is not opened\n",cpc_tty->name);
return;
}
tty_wakeup(tty);
}
/*
* PC300 TTY send to card routine
*
* This routine send data to card.
* o clear descriptors
* o write data to DMA buffers
* o start the transmission
*/
static int cpc_tty_send_to_card(pc300dev_t *dev,void* buf, int len)
{
pc300ch_t *chan = (pc300ch_t *)dev->chan;
pc300_t *card = (pc300_t *)chan->card;
int ch = chan->channel;
struct net_device_stats *stats = &dev->dev->stats;
unsigned long flags;
volatile pcsca_bd_t __iomem *ptdescr;
int i, nchar;
int tosend = len;
int nbuf = ((len - 1)/BD_DEF_LEN) + 1;
unsigned char *pdata=buf;
CPC_TTY_DBG("%s:cpc_tty_send_to_cars len=%i",
(st_cpc_tty_area *)dev->cpc_tty->name,len);
if (nbuf >= card->chan[ch].nfree_tx_bd) {
return 1;
}
/* write buffer to DMA buffers */
CPC_TTY_DBG("%s: call dma_buf_write\n",
(st_cpc_tty_area *)dev->cpc_tty->name);
for (i = 0 ; i < nbuf ; i++) {
ptdescr = (pcsca_bd_t __iomem *)(card->hw.rambase +
TX_BD_ADDR(ch, card->chan[ch].tx_next_bd));
nchar = (BD_DEF_LEN > tosend) ? tosend : BD_DEF_LEN;
if (cpc_readb(&ptdescr->status) & DST_OSB) {
memcpy_toio((void __iomem *)(card->hw.rambase +
cpc_readl(&ptdescr->ptbuf)),
&pdata[len - tosend],
nchar);
card->chan[ch].nfree_tx_bd--;
if ((i + 1) == nbuf) {
/* This must be the last BD to be used */
cpc_writeb(&ptdescr->status, DST_EOM);
} else {
cpc_writeb(&ptdescr->status, 0);
}
cpc_writew(&ptdescr->len, nchar);
} else {
CPC_TTY_DBG("%s: error in dma_buf_write\n",
(st_cpc_tty_area *)dev->cpc_tty->name);
stats->tx_dropped++;
return 1;
}
tosend -= nchar;
card->chan[ch].tx_next_bd =
(card->chan[ch].tx_next_bd + 1) & (N_DMA_TX_BUF - 1);
}
if (dev->trace_on) {
cpc_tty_trace(dev, buf, len,'T');
}
/* start transmission */
CPC_TTY_DBG("%s: start transmission\n",
(st_cpc_tty_area *)dev->cpc_tty->name);
CPC_TTY_LOCK(card, flags);
cpc_writeb(card->hw.scabase + DTX_REG(EDAL, ch),
TX_BD_ADDR(ch, chan->tx_next_bd));
cpc_writeb(card->hw.scabase + M_REG(CMD, ch), CMD_TX_ENA);
cpc_writeb(card->hw.scabase + DSR_TX(ch), DSR_DE);
if (card->hw.type == PC300_TE) {
cpc_writeb(card->hw.falcbase + card->hw.cpld_reg2,
cpc_readb(card->hw.falcbase + card->hw.cpld_reg2) |
(CPLD_REG2_FALC_LED1 << (2 * ch)));
}
CPC_TTY_UNLOCK(card, flags);
return 0;
}
/*
* PC300 TTY trace routine
*
* This routine send trace of connection to application.
* o clear descriptors
* o write data to DMA buffers
* o start the transmission
*/
static void cpc_tty_trace(pc300dev_t *dev, char* buf, int len, char rxtx)
{
struct sk_buff *skb;
if ((skb = dev_alloc_skb(10 + len)) == NULL) {
/* out of memory */
CPC_TTY_DBG("%s: tty_trace - out of memory\n", dev->dev->name);
return;
}
skb_put (skb, 10 + len);
skb->dev = dev->dev;
skb->protocol = htons(ETH_P_CUST);
skb_reset_mac_header(skb);
skb->pkt_type = PACKET_HOST;
skb->len = 10 + len;
skb_copy_to_linear_data(skb, dev->dev->name, 5);
skb->data[5] = '[';
skb->data[6] = rxtx;
skb->data[7] = ']';
skb->data[8] = ':';
skb->data[9] = ' ';
skb_copy_to_linear_data_offset(skb, 10, buf, len);
netif_rx(skb);
}
/*
* PC300 TTY unregister service routine
*
* This routine unregister one interface.
*/
void cpc_tty_unregister_service(pc300dev_t *pc300dev)
{
st_cpc_tty_area *cpc_tty;
ulong flags;
int res;
if ((cpc_tty= (st_cpc_tty_area *) pc300dev->cpc_tty) == NULL) {
CPC_TTY_DBG("%s: interface is not TTY\n", pc300dev->dev->name);
return;
}
CPC_TTY_DBG("%s: cpc_tty_unregister_service", cpc_tty->name);
if (cpc_tty->pc300dev != pc300dev) {
CPC_TTY_DBG("%s: invalid tty ptr=%s\n",
pc300dev->dev->name, cpc_tty->name);
return;
}
if (--cpc_tty_cnt == 0) {
if (serial_drv.refcount) {
CPC_TTY_DBG("%s: unregister is not possible, refcount=%d",
cpc_tty->name, serial_drv.refcount);
cpc_tty_cnt++;
cpc_tty_unreg_flag = 1;
return;
} else {
CPC_TTY_DBG("%s: unregister the tty driver\n", cpc_tty->name);
if ((res=tty_unregister_driver(&serial_drv))) {
CPC_TTY_DBG("%s: ERROR ->unregister the tty driver error=%d\n",
cpc_tty->name,res);
}
}
}
CPC_TTY_LOCK(pc300dev->chan->card,flags);
cpc_tty->tty = NULL;
CPC_TTY_UNLOCK(pc300dev->chan->card, flags);
cpc_tty->tty_minor = 0;
cpc_tty->state = CPC_TTY_ST_IDLE;
}
/*
* PC300 TTY trigger poll routine
* This routine is called by pc300driver to treats Tx interrupt.
*/
void cpc_tty_trigger_poll(pc300dev_t *pc300dev)
{
st_cpc_tty_area *cpc_tty = (st_cpc_tty_area *)pc300dev->cpc_tty;
if (!cpc_tty) {
return;
}
schedule_work(&(cpc_tty->tty_tx_work));
}
/*
* PC300 TTY reset var routine
* This routine is called by pc300driver to init the TTY area.
*/
void cpc_tty_reset_var(void)
{
int i ;
CPC_TTY_DBG("hdlcX-tty: reset variables\n");
/* reset the tty_driver structure - serial_drv */
memset(&serial_drv, 0, sizeof(struct tty_driver));
for (i=0; i < CPC_TTY_NPORTS; i++){
memset(&cpc_tty_area[i],0, sizeof(st_cpc_tty_area));
}
}
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