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ddr: altera: Clean up rw_mgr_mem_calibrate_vfifo_find_dqs_en_phase() part 1

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Fix broken multiline debug strings, fix comments.
No functional change.

Signed-off-by: Marek Vasut <marex@denx.de>
master
Marek Vasut 10 years ago
parent d145ca9fc3
commit 2f3589ca54
1 changed files with 70 additions and 80 deletions
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  1. 150
      drivers/ddr/altera/sequencer.c

150
drivers/ddr/altera/sequencer.c
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@ -1566,7 +1566,7 @@ static int sdr_find_window_center(const u32 grp, const u32 work_bgn,
}
/* find a good dqs enable to use */
static uint32_t rw_mgr_mem_calibrate_vfifo_find_dqs_en_phase(uint32_t grp)
static uint32_t rw_mgr_mem_calibrate_vfifo_find_dqs_en_phase(u32 grp)
{
uint32_t d, p, i;
uint32_t bit_chk;
@ -1581,16 +1581,13 @@ static uint32_t rw_mgr_mem_calibrate_vfifo_find_dqs_en_phase(uint32_t grp)
scc_mgr_set_dqs_en_delay_all_ranks(grp, 0);
scc_mgr_set_dqs_en_phase_all_ranks(grp, 0);
/* ************************************************************** */
/* * Step 0 : Determine number of delay taps for each phase tap * */
dtaps_per_ptap = IO_DELAY_PER_OPA_TAP/IO_DELAY_PER_DQS_EN_DCHAIN_TAP;
/* Step 0: Determine number of delay taps for each phase tap. */
dtaps_per_ptap = IO_DELAY_PER_OPA_TAP / IO_DELAY_PER_DQS_EN_DCHAIN_TAP;
/* ********************************************************* */
/* * Step 1 : First push vfifo until we get a failing read * */
/* Step 1: First push vfifo until we get a failing read. */
find_vfifo_failing_read(grp);
/* ******************************************************** */
/* * step 2: find first working phase, increment in ptaps * */
/* Step 2: Find first working phase, increment in ptaps. */
work_bgn = 0;
if (sdr_working_phase(grp, &work_bgn, &d, &p, &i))
return 0;
@ -1598,25 +1595,25 @@ static uint32_t rw_mgr_mem_calibrate_vfifo_find_dqs_en_phase(uint32_t grp)
work_end = work_bgn;
/*
* If d is 0 then the working window covers a phase tap and
* we can follow the old procedure otherwise, we've found the beginning,
* If d is 0 then the working window covers a phase tap and we can
* follow the old procedure. Otherwise, we've found the beginning
* and we need to increment the dtaps until we find the end.
*/
if (d == 0) {
/* ********************************************************* */
/* * step 3a: if we have room, back off by one and
increment in dtaps * */
/*
* Step 3a: If we have room, back off by one and
* increment in dtaps.
*/
sdr_backup_phase(grp, &work_bgn, &p);
/* ********************************************************* */
/* * step 4a: go forward from working phase to non working
phase, increment in ptaps * */
/*
* Step 4a: go forward from working phase to non working
* phase, increment in ptaps.
*/
if (sdr_nonworking_phase(grp, &work_end, &p, &i))
return 0;
/* ********************************************************* */
/* * step 5a: back off one from last, increment in dtaps * */
/* Step 5a: Back off one from last, increment in dtaps. */
/* Special case code for backing up a phase */
if (p == 0) {
@ -1629,97 +1626,92 @@ static uint32_t rw_mgr_mem_calibrate_vfifo_find_dqs_en_phase(uint32_t grp)
work_end -= IO_DELAY_PER_OPA_TAP;
scc_mgr_set_dqs_en_phase_all_ranks(grp, p);
/* * The actual increment of dtaps is done outside of
the if/else loop to share code */
d = 0;
debug_cond(DLEVEL == 2, "%s:%d find_dqs_en_phase: p: \
ptap=%u\n", __func__, __LINE__,
p);
debug_cond(DLEVEL == 2, "%s:%d p: ptap=%u\n",
__func__, __LINE__, p);
} else {
/* ******************************************************* */
/* * step 3-5b: Find the right edge of the window using
delay taps * */
debug_cond(DLEVEL == 2, "%s:%d find_dqs_en_phase: \
ptap=%u dtap=%u bgn=%u\n", __func__, __LINE__,
p, d, work_bgn);
/*
* Step 3-5b: Find the right edge of the window
* using delay taps.
*/
debug_cond(DLEVEL == 2,
"%s:%d ptap=%u dtap=%u bgn=%u\n",
__func__, __LINE__, p, d, work_bgn);
work_end = work_bgn;
}
/* The dtap increment to find the failing edge is done here */
for (; d <= IO_DQS_EN_DELAY_MAX; d++, work_end +=
IO_DELAY_PER_DQS_EN_DCHAIN_TAP) {
debug_cond(DLEVEL == 2, "%s:%d find_dqs_en_phase: \
end-2: dtap=%u\n", __func__, __LINE__, d);
scc_mgr_set_dqs_en_delay_all_ranks(grp, d);
/* The dtap increment to find the failing edge is done here. */
for (; d <= IO_DQS_EN_DELAY_MAX;
d++, work_end += IO_DELAY_PER_DQS_EN_DCHAIN_TAP) {
debug_cond(DLEVEL == 2, "%s:%d end-2: dtap=%u\n",
__func__, __LINE__, d);
if (!rw_mgr_mem_calibrate_read_test_all_ranks(grp, 1,
PASS_ONE_BIT,
&bit_chk, 0)) {
break;
}
scc_mgr_set_dqs_en_delay_all_ranks(grp, d);
if (!rw_mgr_mem_calibrate_read_test_all_ranks(grp, 1,
PASS_ONE_BIT,
&bit_chk, 0)) {
break;
}
}
/* Go back to working dtap */
if (d != 0)
work_end -= IO_DELAY_PER_DQS_EN_DCHAIN_TAP;
debug_cond(DLEVEL == 2, "%s:%d find_dqs_en_phase: p/d: \
ptap=%u dtap=%u end=%u\n", __func__, __LINE__,
p, d-1, work_end);
debug_cond(DLEVEL == 2,
"%s:%d p/d: ptap=%u dtap=%u end=%u\n",
__func__, __LINE__, p, d - 1, work_end);
if (work_end < work_bgn) {
/* nil range */
debug_cond(DLEVEL == 2, "%s:%d find_dqs_en_phase: end-2: \
failed\n", __func__, __LINE__);
debug_cond(DLEVEL == 2, "%s:%d end-2: failed\n",
__func__, __LINE__);
return 0;
}
debug_cond(DLEVEL == 2, "%s:%d find_dqs_en_phase: found range [%u,%u]\n",
debug_cond(DLEVEL == 2, "%s:%d found range [%u,%u]\n",
__func__, __LINE__, work_bgn, work_end);
/* *************************************************************** */
/*
* * We need to calculate the number of dtaps that equal a ptap
* * To do that we'll back up a ptap and re-find the edge of the
* * window using dtaps
* We need to calculate the number of dtaps that equal a ptap.
* To do that we'll back up a ptap and re-find the edge of the
* window using dtaps
*/
debug_cond(DLEVEL == 2, "%s:%d find_dqs_en_phase: calculate dtaps_per_ptap \
for tracking\n", __func__, __LINE__);
debug_cond(DLEVEL == 2, "%s:%d calculate dtaps_per_ptap for tracking\n",
__func__, __LINE__);
/* Special case code for backing up a phase */
if (p == 0) {
p = IO_DQS_EN_PHASE_MAX;
rw_mgr_decr_vfifo(grp);
debug_cond(DLEVEL == 2, "%s:%d find_dqs_en_phase: backedup \
cycle/phase: p=%u\n", __func__, __LINE__,
p);
debug_cond(DLEVEL == 2, "%s:%d backedup cycle/phase: p=%u\n",
__func__, __LINE__, p);
} else {
p = p - 1;
debug_cond(DLEVEL == 2, "%s:%d find_dqs_en_phase: backedup \
phase only: p=%u", __func__, __LINE__,
p);
debug_cond(DLEVEL == 2, "%s:%d backedup phase only: p=%u",
__func__, __LINE__, p);
}
scc_mgr_set_dqs_en_phase_all_ranks(grp, p);
/*
* Increase dtap until we first see a passing read (in case the
* window is smaller than a ptap),
* and then a failing read to mark the edge of the window again
* window is smaller than a ptap), and then a failing read to
* mark the edge of the window again.
*/
/* Find a passing read */
debug_cond(DLEVEL == 2, "%s:%d find_dqs_en_phase: find passing read\n",
/* Find a passing read. */
debug_cond(DLEVEL == 2, "%s:%d find passing read\n",
__func__, __LINE__);
found_passing_read = 0;
found_failing_read = 0;
initial_failing_dtap = d;
for (; d <= IO_DQS_EN_DELAY_MAX; d++) {
debug_cond(DLEVEL == 2, "%s:%d find_dqs_en_phase: testing \
read d=%u\n", __func__, __LINE__, d);
debug_cond(DLEVEL == 2, "%s:%d testing read d=%u\n",
__func__, __LINE__, d);
scc_mgr_set_dqs_en_delay_all_ranks(grp, d);
if (rw_mgr_mem_calibrate_read_test_all_ranks(grp, 1,
@ -1731,12 +1723,12 @@ static uint32_t rw_mgr_mem_calibrate_vfifo_find_dqs_en_phase(uint32_t grp)
}
if (found_passing_read) {
/* Find a failing read */
debug_cond(DLEVEL == 2, "%s:%d find_dqs_en_phase: find failing \
read\n", __func__, __LINE__);
/* Find a failing read. */
debug_cond(DLEVEL == 2, "%s:%d find failing read\n",
__func__, __LINE__);
for (d = d + 1; d <= IO_DQS_EN_DELAY_MAX; d++) {
debug_cond(DLEVEL == 2, "%s:%d find_dqs_en_phase: \
testing read d=%u\n", __func__, __LINE__, d);
debug_cond(DLEVEL == 2, "%s:%d testing read d=%u\n",
__func__, __LINE__, d);
scc_mgr_set_dqs_en_delay_all_ranks(grp, d);
if (!rw_mgr_mem_calibrate_read_test_all_ranks
@ -1746,9 +1738,9 @@ static uint32_t rw_mgr_mem_calibrate_vfifo_find_dqs_en_phase(uint32_t grp)
}
}
} else {
debug_cond(DLEVEL == 1, "%s:%d find_dqs_en_phase: failed to \
calculate dtaps", __func__, __LINE__);
debug_cond(DLEVEL == 1, "per ptap. Fall back on static value\n");
debug_cond(DLEVEL == 1,
"%s:%d failed to calculate dtaps per ptap. Fall back on static value\n",
__func__, __LINE__);
}
/*
@ -1761,14 +1753,12 @@ static uint32_t rw_mgr_mem_calibrate_vfifo_find_dqs_en_phase(uint32_t grp)
dtaps_per_ptap = d - initial_failing_dtap;
writel(dtaps_per_ptap, &sdr_reg_file->dtaps_per_ptap);
debug_cond(DLEVEL == 2, "%s:%d find_dqs_en_phase: dtaps_per_ptap=%u \
- %u = %u", __func__, __LINE__, d,
initial_failing_dtap, dtaps_per_ptap);
debug_cond(DLEVEL == 2, "%s:%d dtaps_per_ptap=%u - %u = %u",
__func__, __LINE__, d, initial_failing_dtap, dtaps_per_ptap);
/* ******************************************** */
/* * step 6: Find the centre of the window * */
/* Step 6: Find the centre of the window. */
if (sdr_find_window_centre(grp, work_bgn, work_end))
return 0; /* FIXME: Old code, return 0 means failure :-( */
return 0;
return 1;
}

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