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: Mike Isely <isely@pobox.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Mike Isely
Mauro Carvalho Chehab
parent
567d7115b9
commit
c43000ef0c
1 changed files with 94 additions and 60 deletions
|
|
@ -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 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;
|
||||
}
|
||||
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]);
|
||||
}
|
||||
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);
|
||||
|
|
|
|||
Loading…
Reference in a new issue