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ddr: altera: Clean up rw_mgr_mem_calibrate_writes_center() part 2

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Factor out common code for searching best DM/DQS window.

Signed-off-by: Marek Vasut <marex@denx.de>
This commit is contained in:
Marek Vasut 2015-07-21 05:26:58 +02:00
parent 3b44f55c3b
commit c8570afa04
1 changed files with 88 additions and 79 deletions
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167
drivers/ddr/altera/sequencer.c
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@ -2883,6 +2883,89 @@ static uint32_t rw_mgr_mem_calibrate_write_test(uint32_t rank_bgn,
} }
} }
/**
* search_window() - Search for the/part of the window with DM/DQS shift
* @search_dm: If 1, search for the DM shift, if 0, search for DQS shift
* @rank_bgn: Rank number
* @write_group: Write Group
* @bgn_curr: Current window begin
* @end_curr: Current window end
* @bgn_best: Current best window begin
* @end_best: Current best window end
* @win_best: Size of the best window
* @new_dqs: New DQS value (only applicable if search_dm = 0).
*
* Search for the/part of the window with DM/DQS shift.
*/
static void search_window(const int search_dm,
const u32 rank_bgn, const u32 write_group,
int *bgn_curr, int *end_curr, int *bgn_best,
int *end_best, int *win_best, int new_dqs)
{
u32 bit_chk;
const int max = IO_IO_OUT1_DELAY_MAX - new_dqs;
int d, di;
/* Search for the/part of the window with DM/DQS shift. */
for (di = max; di >= 0; di -= DELTA_D) {
if (search_dm) {
d = di;
scc_mgr_apply_group_dm_out1_delay(d);
} else {
/* For DQS, we go from 0...max */
d = max - di;
/*
* Note: This only shifts DQS, so are we limiting ourselve to
* width of DQ unnecessarily.
*/
scc_mgr_apply_group_dqs_io_and_oct_out1(write_group,
d + new_dqs);
}
writel(0, &sdr_scc_mgr->update);
if (rw_mgr_mem_calibrate_write_test(rank_bgn, write_group, 1,
PASS_ALL_BITS, &bit_chk,
0)) {
/* Set current end of the window. */
*end_curr = search_dm ? -d : d;
/*
* If a starting edge of our window has not been seen
* this is our current start of the DM window.
*/
if (*bgn_curr == IO_IO_OUT1_DELAY_MAX + 1)
*bgn_curr = search_dm ? -d : d;
/*
* If current window is bigger than best seen.
* Set best seen to be current window.
*/
if ((*end_curr - *bgn_curr + 1) > *win_best) {
*win_best = *end_curr - *bgn_curr + 1;
*bgn_best = *bgn_curr;
*end_best = *end_curr;
}
} else {
/* We just saw a failing test. Reset temp edge. */
*bgn_curr = IO_IO_OUT1_DELAY_MAX + 1;
*end_curr = IO_IO_OUT1_DELAY_MAX + 1;
/* Early exit is only applicable to DQS. */
if (search_dm)
continue;
/*
* Early exit optimization: if the remaining delay
* chain space is less than already seen largest
* window we can exit.
*/
if (*win_best - 1 > IO_IO_OUT1_DELAY_MAX - new_dqs - d)
break;
}
}
}
/* /*
* center all windows. do per-bit-deskew to possibly increase size of * center all windows. do per-bit-deskew to possibly increase size of
* certain windows. * certain windows.
@ -2891,8 +2974,7 @@ static int
rw_mgr_mem_calibrate_writes_center(const u32 rank_bgn, const u32 write_group, rw_mgr_mem_calibrate_writes_center(const u32 rank_bgn, const u32 write_group,
const u32 test_bgn) const u32 test_bgn)
{ {
int i, d; int i;
u32 bit_chk;
u32 sticky_bit_chk; u32 sticky_bit_chk;
u32 min_index; u32 min_index;
u32 addr; u32 addr;
@ -2975,37 +3057,8 @@ rw_mgr_mem_calibrate_writes_center(const u32 rank_bgn, const u32 write_group,
right_edge[0] = IO_IO_OUT1_DELAY_MAX + 1; right_edge[0] = IO_IO_OUT1_DELAY_MAX + 1;
/* Search for the/part of the window with DM shift. */ /* Search for the/part of the window with DM shift. */
for (d = IO_IO_OUT1_DELAY_MAX; d >= 0; d -= DELTA_D) { search_window(1, rank_bgn, write_group, &bgn_curr, &end_curr,
scc_mgr_apply_group_dm_out1_delay(d); &bgn_best, &end_best, &win_best, 0);
writel(0, &sdr_scc_mgr->update);
if (rw_mgr_mem_calibrate_write_test(rank_bgn, write_group, 1,
PASS_ALL_BITS, &bit_chk,
0)) {
/* Set current end of the window. */
end_curr = -d;
/*
* If a starting edge of our window has not been seen
* this is our current start of the DM window.
*/
if (bgn_curr == IO_IO_OUT1_DELAY_MAX + 1)
bgn_curr = -d;
/*
* If current window is bigger than best seen.
* Set best seen to be current window.
*/
if ((end_curr-bgn_curr+1) > win_best) {
win_best = end_curr-bgn_curr+1;
bgn_best = bgn_curr;
end_best = end_curr;
}
} else {
/* We just saw a failing test. Reset temp edge. */
bgn_curr = IO_IO_OUT1_DELAY_MAX + 1;
end_curr = IO_IO_OUT1_DELAY_MAX + 1;
}
}
/* Reset DM delay chains to 0. */ /* Reset DM delay chains to 0. */
scc_mgr_apply_group_dm_out1_delay(0); scc_mgr_apply_group_dm_out1_delay(0);
@ -3021,52 +3074,8 @@ rw_mgr_mem_calibrate_writes_center(const u32 rank_bgn, const u32 write_group,
} }
/* Search for the/part of the window with DQS shifts. */ /* Search for the/part of the window with DQS shifts. */
for (d = 0; d <= IO_IO_OUT1_DELAY_MAX - new_dqs; d += DELTA_D) { search_window(0, rank_bgn, write_group, &bgn_curr, &end_curr,
/* &bgn_best, &end_best, &win_best, new_dqs);
* Note: This only shifts DQS, so are we limiting ourselve to
* width of DQ unnecessarily.
*/
scc_mgr_apply_group_dqs_io_and_oct_out1(write_group,
d + new_dqs);
writel(0, &sdr_scc_mgr->update);
if (rw_mgr_mem_calibrate_write_test(rank_bgn, write_group, 1,
PASS_ALL_BITS, &bit_chk,
0)) {
/* Set current end of the window. */
end_curr = d;
/*
* If a beginning edge of our window has not been seen
* this is our current begin of the DM window.
*/
if (bgn_curr == IO_IO_OUT1_DELAY_MAX + 1)
bgn_curr = d;
/*
* If current window is bigger than best seen. Set best
* seen to be current window.
*/
if ((end_curr-bgn_curr+1) > win_best) {
win_best = end_curr-bgn_curr+1;
bgn_best = bgn_curr;
end_best = end_curr;
}
} else {
/* We just saw a failing test. Reset temp edge. */
bgn_curr = IO_IO_OUT1_DELAY_MAX + 1;
end_curr = IO_IO_OUT1_DELAY_MAX + 1;
/*
* Early exit optimization: if the remaining delay
* chain space is less than already seen largest
* window we can exit.
*/
if ((win_best-1) >
(IO_IO_OUT1_DELAY_MAX - new_dqs - d)) {
break;
}
}
}
/* Assign left and right edge for cal and reporting. */ /* Assign left and right edge for cal and reporting. */
left_edge[0] = -1 * bgn_best; left_edge[0] = -1 * bgn_best;