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[PATCH] add synclink_gt crc return feature 

Add ability to return HDLC CRC to user application.

Signed-off-by: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
hifive-unleashed-5.1
Paul Fulghum 2006-06-25 05:49:21 -07:00 committed by Linus Torvalds
parent 643f3319b9
commit 04b374d0f5
1 changed files with 33 additions and 22 deletions
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55
drivers/char/synclink_gt.c
View File

@ -3077,7 +3077,7 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
static int alloc_tmp_rbuf(struct slgt_info *info)
{
info->tmp_rbuf = kmalloc(info->max_frame_size, GFP_KERNEL);
info->tmp_rbuf = kmalloc(info->max_frame_size + 5, GFP_KERNEL);
if (info->tmp_rbuf == NULL)
return -ENOMEM;
return 0;
@ -4011,7 +4011,7 @@ static void hdlc_mode(struct slgt_info *info)
case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
}
switch (info->params.crc_type)
switch (info->params.crc_type & HDLC_CRC_MASK)
{
case HDLC_CRC_16_CCITT: val |= BIT9; break;
case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
@ -4072,7 +4072,7 @@ static void hdlc_mode(struct slgt_info *info)
case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
}
switch (info->params.crc_type)
switch (info->params.crc_type & HDLC_CRC_MASK)
{
case HDLC_CRC_16_CCITT: val |= BIT9; break;
case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
@ -4333,6 +4333,12 @@ static int rx_get_frame(struct slgt_info *info)
unsigned long flags;
struct tty_struct *tty = info->tty;
unsigned char addr_field = 0xff;
unsigned int crc_size = 0;
switch (info->params.crc_type & HDLC_CRC_MASK) {
case HDLC_CRC_16_CCITT: crc_size = 2; break;
case HDLC_CRC_32_CCITT: crc_size = 4; break;
}
check_again:
@ -4377,7 +4383,7 @@ check_again:
status = desc_status(info->rbufs[end]);
/* ignore CRC bit if not using CRC (bit is undefined) */
if (info->params.crc_type == HDLC_CRC_NONE)
if ((info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_NONE)
status &= ~BIT1;
if (framesize == 0 ||
@ -4386,34 +4392,34 @@ check_again:
goto check_again;
}
if (framesize < 2 || status & (BIT1+BIT0)) {
if (framesize < 2 || (status & BIT0))
info->icount.rxshort++;
else
info->icount.rxcrc++;
if (framesize < (2 + crc_size) || status & BIT0) {
info->icount.rxshort++;
framesize = 0;
} else if (status & BIT1) {
info->icount.rxcrc++;
if (!(info->params.crc_type & HDLC_CRC_RETURN_EX))
framesize = 0;
}
#ifdef CONFIG_HDLC
{
struct net_device_stats *stats = hdlc_stats(info->netdev);
stats->rx_errors++;
stats->rx_frame_errors++;
}
#endif
} else {
/* adjust frame size for CRC, if any */
if (info->params.crc_type == HDLC_CRC_16_CCITT)
framesize -= 2;
else if (info->params.crc_type == HDLC_CRC_32_CCITT)
framesize -= 4;
if (framesize == 0) {
struct net_device_stats *stats = hdlc_stats(info->netdev);
stats->rx_errors++;
stats->rx_frame_errors++;
}
#endif
DBGBH(("%s rx frame status=%04X size=%d\n",
info->device_name, status, framesize));
DBGDATA(info, info->rbufs[start].buf, min_t(int, framesize, DMABUFSIZE), "rx");
if (framesize) {
if (framesize > info->max_frame_size)
if (!(info->params.crc_type & HDLC_CRC_RETURN_EX)) {
framesize -= crc_size;
crc_size = 0;
}
if (framesize > info->max_frame_size + crc_size)
info->icount.rxlong++;
else {
/* copy dma buffer(s) to contiguous temp buffer */
@ -4433,6 +4439,11 @@ check_again:
i = 0;
}
if (info->params.crc_type & HDLC_CRC_RETURN_EX) {
*p = (status & BIT1) ? RX_CRC_ERROR : RX_OK;
framesize++;
}
#ifdef CONFIG_HDLC
if (info->netcount)
hdlcdev_rx(info,info->tmp_rbuf, framesize);