提交 c43000ef 编写于 作者: M Mike Isely 提交者: Mauro Carvalho Chehab

V4L/DVB (5173): Pvrusb2: encoder comm protocol cleanup

Update the implementation of the communication protocol for operating
the encoder, using updated knowledge about the encoder.
Signed-off-by: NMike Isely <isely@pobox.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>
上级 567d7115
......@@ -35,34 +35,41 @@
#define IVTV_MBOX_DRIVER_DONE 0x00000002
#define IVTV_MBOX_DRIVER_BUSY 0x00000001
#define MBOX_BASE 0x44
static int pvr2_encoder_write_words(struct pvr2_hdw *hdw,
unsigned int offs,
const u32 *data, unsigned int dlen)
{
unsigned int idx;
unsigned int idx,addr;
unsigned int bAddr;
int ret;
unsigned int offs = 0;
unsigned int chunkCnt;
/*
Format: First byte must be 0x01. Remaining 32 bit words are
spread out into chunks of 7 bytes each, little-endian ordered,
offset at zero within each 2 blank bytes following and a
single byte that is 0x44 plus the offset of the word. Repeat
request for additional words, with offset adjusted
accordingly.
spread out into chunks of 7 bytes each, with the first 4 bytes
being the data word (little endian), and the next 3 bytes
being the address where that data word is to be written (big
endian). Repeat request for additional words, with offset
adjusted accordingly.
*/
while (dlen) {
chunkCnt = 8;
if (chunkCnt > dlen) chunkCnt = dlen;
memset(hdw->cmd_buffer,0,sizeof(hdw->cmd_buffer));
hdw->cmd_buffer[0] = FX2CMD_MEM_WRITE_DWORD;
bAddr = 0;
hdw->cmd_buffer[bAddr++] = FX2CMD_MEM_WRITE_DWORD;
for (idx = 0; idx < chunkCnt; idx++) {
hdw->cmd_buffer[1+(idx*7)+6] = 0x44 + idx + offs;
PVR2_DECOMPOSE_LE(hdw->cmd_buffer, 1+(idx*7),
data[idx]);
addr = idx + offs;
hdw->cmd_buffer[bAddr+6] = (addr & 0xffu);
hdw->cmd_buffer[bAddr+5] = ((addr>>8) & 0xffu);
hdw->cmd_buffer[bAddr+4] = ((addr>>16) & 0xffu);
PVR2_DECOMPOSE_LE(hdw->cmd_buffer, bAddr,data[idx]);
bAddr += 7;
}
ret = pvr2_send_request(hdw,
hdw->cmd_buffer,1+(chunkCnt*7),
......@@ -77,34 +84,42 @@ static int pvr2_encoder_write_words(struct pvr2_hdw *hdw,
}
static int pvr2_encoder_read_words(struct pvr2_hdw *hdw,int statusFl,
static int pvr2_encoder_read_words(struct pvr2_hdw *hdw,
unsigned int offs,
u32 *data, unsigned int dlen)
{
unsigned int idx;
int ret;
unsigned int offs = 0;
unsigned int chunkCnt;
/*
Format: First byte must be 0x02 (status check) or 0x28 (read
back block of 32 bit words). Next 6 bytes must be zero,
followed by a single byte of 0x44+offset for portion to be
read. Returned data is packed set of 32 bits words that were
read.
followed by a single byte of MBOX_BASE+offset for portion to
be read. Returned data is packed set of 32 bits words that
were read.
*/
while (dlen) {
chunkCnt = 16;
if (chunkCnt > dlen) chunkCnt = dlen;
memset(hdw->cmd_buffer,0,sizeof(hdw->cmd_buffer));
if (chunkCnt < 16) chunkCnt = 1;
hdw->cmd_buffer[0] =
(statusFl ? FX2CMD_MEM_READ_DWORD : FX2CMD_MEM_READ_64BYTES);
hdw->cmd_buffer[7] = 0x44 + offs;
((chunkCnt == 1) ?
FX2CMD_MEM_READ_DWORD : FX2CMD_MEM_READ_64BYTES);
hdw->cmd_buffer[1] = 0;
hdw->cmd_buffer[2] = 0;
hdw->cmd_buffer[3] = 0;
hdw->cmd_buffer[4] = 0;
hdw->cmd_buffer[5] = ((offs>>16) & 0xffu);
hdw->cmd_buffer[6] = ((offs>>8) & 0xffu);
hdw->cmd_buffer[7] = (offs & 0xffu);
ret = pvr2_send_request(hdw,
hdw->cmd_buffer,8,
hdw->cmd_buffer,chunkCnt * 4);
hdw->cmd_buffer,
(chunkCnt == 1 ? 4 : 16 * 4));
if (ret) return ret;
for (idx = 0; idx < chunkCnt; idx++) {
......@@ -131,6 +146,8 @@ static int pvr2_encoder_cmd(void *ctxt,
u32 *argp)
{
unsigned int poll_count;
unsigned int try_count = 0;
int retry_flag;
int ret = 0;
unsigned int idx;
/* These sizes look to be limited by the FX2 firmware implementation */
......@@ -142,14 +159,15 @@ static int pvr2_encoder_cmd(void *ctxt,
/*
The encoder seems to speak entirely using blocks 32 bit words.
In ivtv driver terms, this is a mailbox which we populate with
data and watch what the hardware does with it. The first word
is a set of flags used to control the transaction, the second
word is the command to execute, the third byte is zero (ivtv
driver suggests that this is some kind of return value), and
the fourth byte is a specified timeout (windows driver always
uses 0x00060000 except for one case when it is zero). All
successive words are the argument words for the command.
In ivtv driver terms, this is a mailbox at MBOX_BASE which we
populate with data and watch what the hardware does with it.
The first word is a set of flags used to control the
transaction, the second word is the command to execute, the
third byte is zero (ivtv driver suggests that this is some
kind of return value), and the fourth byte is a specified
timeout (windows driver always uses 0x00060000 except for one
case when it is zero). All successive words are the argument
words for the command.
First, write out the entire set of words, with the first word
being zero.
......@@ -158,13 +176,10 @@ static int pvr2_encoder_cmd(void *ctxt,
IVTV_MBOX_DRIVER_DONE | IVTV_DRIVER_BUSY this time (which
probably means "go").
Next, read back 16 words as status. Check the first word,
Next, read back the return count words. Check the first word,
which should have IVTV_MBOX_FIRMWARE_DONE set. If however
that bit is not set, then the command isn't done so repeat the
read.
Next, read back 32 words and compare with the original
arugments. Hopefully they will match.
read until it is set.
Finally, write out just the first word again, but set it to
0x0 this time (which probably means "idle").
......@@ -194,6 +209,9 @@ static int pvr2_encoder_cmd(void *ctxt,
LOCK_TAKE(hdw->ctl_lock); do {
retry_flag = 0;
try_count++;
ret = 0;
wrData[0] = 0;
wrData[1] = cmd;
wrData[2] = 0;
......@@ -205,54 +223,70 @@ static int pvr2_encoder_cmd(void *ctxt,
wrData[idx+4] = 0;
}
ret = pvr2_encoder_write_words(hdw,wrData,idx);
ret = pvr2_encoder_write_words(hdw,MBOX_BASE,wrData,idx);
if (ret) break;
wrData[0] = IVTV_MBOX_DRIVER_DONE|IVTV_MBOX_DRIVER_BUSY;
ret = pvr2_encoder_write_words(hdw,wrData,1);
ret = pvr2_encoder_write_words(hdw,MBOX_BASE,wrData,1);
if (ret) break;
poll_count = 0;
while (1) {
if (poll_count < 10000000) poll_count++;
ret = pvr2_encoder_read_words(hdw,!0,rdData,1);
if (ret) break;
poll_count++;
ret = pvr2_encoder_read_words(hdw,MBOX_BASE,rdData,
arg_cnt_recv+4);
if (ret) {
break;
}
if (rdData[0] & IVTV_MBOX_FIRMWARE_DONE) {
break;
}
if (poll_count == 100) {
if (rdData[0] && (poll_count < 1000)) continue;
if (!rdData[0]) {
retry_flag = !0;
pvr2_trace(
PVR2_TRACE_ERROR_LEGS,
"Encoder timed out waiting for us"
"; arranging to retry");
} else {
pvr2_trace(
PVR2_TRACE_ERROR_LEGS,
"***WARNING*** device's encoder"
" appears to be stuck"
" (status=0%08x)",rdData[0]);
}
pvr2_trace(
PVR2_TRACE_ERROR_LEGS,
"Encoder command: 0x%02x",cmd);
for (idx = 4; idx < arg_cnt_send; idx++) {
pvr2_trace(
PVR2_TRACE_ERROR_LEGS,
"Encoder command: 0x%02x",cmd);
for (idx = 4; idx < arg_cnt_send; idx++) {
pvr2_trace(
PVR2_TRACE_ERROR_LEGS,
"Encoder arg%d: 0x%08x",
idx-3,wrData[idx]);
}
pvr2_trace(
PVR2_TRACE_ERROR_LEGS,
"Giving up waiting."
" It is likely that"
" this is a bad idea...");
ret = -EBUSY;
break;
"Encoder arg%d: 0x%08x",
idx-3,wrData[idx]);
}
ret = -EBUSY;
break;
}
if (retry_flag) {
if (try_count < 20) continue;
pvr2_trace(
PVR2_TRACE_ERROR_LEGS,
"Too many retries...");
ret = -EBUSY;
}
if (ret) {
pvr2_trace(
PVR2_TRACE_ERROR_LEGS,
"Giving up on command."
" It is likely that"
" this is a bad idea...");
break;
}
if (ret) break;
wrData[0] = 0x7;
ret = pvr2_encoder_read_words(
hdw,0,rdData, ARRAY_SIZE(rdData));
if (ret) break;
for (idx = 0; idx < arg_cnt_recv; idx++) {
argp[idx] = rdData[idx+4];
}
wrData[0] = 0x0;
ret = pvr2_encoder_write_words(hdw,wrData,1);
ret = pvr2_encoder_write_words(hdw,MBOX_BASE,wrData,1);
if (ret) break;
} while(0); LOCK_GIVE(hdw->ctl_lock);
......
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