From 71120773bf1206434f35b4933b16afb4166054e7 Mon Sep 17 00:00:00 2001 From: Marek Vasut Date: Mon, 13 Jul 2015 02:38:15 +0200 Subject: [PATCH] ddr: altera: Clean up rw_mgr_mem_calibrate_vfifo_center() part 2 Factor out common code from rw_mgr_mem_calibrate_writes_center() and rw_mgr_mem_calibrate_vfifo_center() for searching for the left edge of the window. The code is almost identical, so pull it into separate function and cater for the minor differences. Signed-off-by: Marek Vasut --- drivers/ddr/altera/sequencer.c | 316 +++++++++++++++++++---------------------- 1 file changed, 146 insertions(+), 170 deletions(-) diff --git a/drivers/ddr/altera/sequencer.c b/drivers/ddr/altera/sequencer.c index b175313..8f55e44 100644 --- a/drivers/ddr/altera/sequencer.c +++ b/drivers/ddr/altera/sequencer.c @@ -1781,6 +1781,145 @@ static int rw_mgr_mem_calibrate_vfifo_find_dqs_en_phase(const u32 grp) } /** + * search_left_edge() - Find left edge of DQ/DQS working phase + * @write: Perform read (Stage 2) or write (Stage 3) calibration + * @rank_bgn: Rank number + * @write_group: Write Group + * @read_group: Read Group + * @test_bgn: Rank number to begin the test + * @bit_chk: Resulting bit mask after the test + * @sticky_bit_chk: Resulting sticky bit mask after the test + * @left_edge: Left edge of the DQ/DQS phase + * @right_edge: Right edge of the DQ/DQS phase + * @use_read_test: Perform read test + * + * Find left edge of DQ/DQS working phase. + */ +static void search_left_edge(const int write, const int rank_bgn, + const u32 write_group, const u32 read_group, const u32 test_bgn, + u32 *bit_chk, u32 *sticky_bit_chk, + int *left_edge, int *right_edge, const u32 use_read_test) +{ + const u32 correct_mask = write ? param->write_correct_mask : + param->read_correct_mask; + const u32 delay_max = write ? IO_IO_OUT1_DELAY_MAX : IO_IO_IN_DELAY_MAX; + const u32 dqs_max = write ? IO_IO_OUT1_DELAY_MAX : IO_DQS_IN_DELAY_MAX; + const u32 per_dqs = write ? RW_MGR_MEM_DQ_PER_WRITE_DQS : + RW_MGR_MEM_DQ_PER_READ_DQS; + u32 stop; + int i, d; + + for (d = 0; d <= dqs_max; d++) { + if (write) + scc_mgr_apply_group_dq_out1_delay(d); + else + scc_mgr_apply_group_dq_in_delay(test_bgn, d); + + writel(0, &sdr_scc_mgr->update); + + /* + * Stop searching when the read test doesn't pass AND when + * we've seen a passing read on every bit. + */ + if (write) { /* WRITE-ONLY */ + stop = !rw_mgr_mem_calibrate_write_test(rank_bgn, + write_group, + 0, PASS_ONE_BIT, + bit_chk, 0); + } else if (use_read_test) { /* READ-ONLY */ + stop = !rw_mgr_mem_calibrate_read_test(rank_bgn, + read_group, NUM_READ_PB_TESTS, PASS_ONE_BIT, + bit_chk, 0, 0); + } else { /* READ-ONLY */ + rw_mgr_mem_calibrate_write_test(rank_bgn, + write_group, + 0, PASS_ONE_BIT, + bit_chk, 0); + *bit_chk = *bit_chk >> (per_dqs * + (read_group - (write_group * + RW_MGR_MEM_IF_READ_DQS_WIDTH / + RW_MGR_MEM_IF_WRITE_DQS_WIDTH))); + stop = (*bit_chk == 0); + } + *sticky_bit_chk = *sticky_bit_chk | *bit_chk; + stop = stop && (*sticky_bit_chk == correct_mask); + debug_cond(DLEVEL == 2, + "%s:%d center(left): dtap=%u => %u == %u && %u", __func__, __LINE__, d, + *sticky_bit_chk, correct_mask, stop); + + if (stop == 1) + break; + + /* stop != 1 */ + for (i = 0; i < per_dqs; i++) { + if (*bit_chk & 1) { + /* + * Remember a passing test as + * the left_edge. + */ + left_edge[i] = d; + } else { + /* + * If a left edge has not been seen + * yet, then a future passing test + * will mark this edge as the right + * edge. + */ + if (left_edge[i] == delay_max + 1) + right_edge[i] = -(d + 1); + } + *bit_chk = *bit_chk >> 1; + } + } + + /* Reset DQ delay chains to 0 */ + if (write) + scc_mgr_apply_group_dq_out1_delay(0); + else + scc_mgr_apply_group_dq_in_delay(test_bgn, 0); + + *sticky_bit_chk = 0; + for (i = per_dqs - 1; i >= 0; i--) { + debug_cond(DLEVEL == 2, + "%s:%d vfifo_center: left_edge[%u]: %d right_edge[%u]: %d\n", + __func__, __LINE__, i, left_edge[i], + i, right_edge[i]); + + /* + * Check for cases where we haven't found the left edge, + * which makes our assignment of the the right edge invalid. + * Reset it to the illegal value. + */ + if ((left_edge[i] == delay_max + 1) && + (right_edge[i] != delay_max + 1)) { + right_edge[i] = delay_max + 1; + debug_cond(DLEVEL == 2, + "%s:%d vfifo_center: reset right_edge[%u]: %d\n", + __func__, __LINE__, i, right_edge[i]); + } + + /* + * Reset sticky bit + * READ: except for bits where we have seen both + * the left and right edge. + * WRITE: except for bits where we have seen the + * left edge. + */ + *sticky_bit_chk <<= 1; + if (write) { + if (left_edge[i] != delay_max + 1) + *sticky_bit_chk |= 1; + } else { + if ((left_edge[i] != delay_max + 1) && + (right_edge[i] != delay_max + 1)) + *sticky_bit_chk |= 1; + } + } + + +} + +/** * search_right_edge() - Find right edge of DQ/DQS working phase * @write: Perform read (Stage 2) or write (Stage 3) calibration * @rank_bgn: Rank number @@ -1945,7 +2084,7 @@ static uint32_t rw_mgr_mem_calibrate_vfifo_center(uint32_t rank_bgn, uint32_t write_group, uint32_t read_group, uint32_t test_bgn, uint32_t use_read_test, uint32_t update_fom) { - uint32_t i, p, d, min_index; + uint32_t i, p, min_index; /* * Store these as signed since there are comparisons with * signed numbers. @@ -1960,7 +2099,6 @@ static uint32_t rw_mgr_mem_calibrate_vfifo_center(uint32_t rank_bgn, int32_t new_dqs, start_dqs, start_dqs_en, shift_dq, final_dqs, final_dqs_en; int32_t dq_margin, dqs_margin; - uint32_t stop; uint32_t temp_dq_in_delay1, temp_dq_in_delay2; uint32_t addr; int ret; @@ -1982,92 +2120,9 @@ static uint32_t rw_mgr_mem_calibrate_vfifo_center(uint32_t rank_bgn, } /* Search for the left edge of the window for each bit */ - for (d = 0; d <= IO_IO_IN_DELAY_MAX; d++) { - scc_mgr_apply_group_dq_in_delay(write_group, test_bgn, d); - - writel(0, &sdr_scc_mgr->update); - - /* - * Stop searching when the read test doesn't pass AND when - * we've seen a passing read on every bit. - */ - if (use_read_test) { - stop = !rw_mgr_mem_calibrate_read_test(rank_bgn, - read_group, NUM_READ_PB_TESTS, PASS_ONE_BIT, - &bit_chk, 0, 0); - } else { - rw_mgr_mem_calibrate_write_test(rank_bgn, write_group, - 0, PASS_ONE_BIT, - &bit_chk, 0); - bit_chk = bit_chk >> (RW_MGR_MEM_DQ_PER_READ_DQS * - (read_group - (write_group * - RW_MGR_MEM_IF_READ_DQS_WIDTH / - RW_MGR_MEM_IF_WRITE_DQS_WIDTH))); - stop = (bit_chk == 0); - } - sticky_bit_chk = sticky_bit_chk | bit_chk; - stop = stop && (sticky_bit_chk == param->read_correct_mask); - debug_cond(DLEVEL == 2, "%s:%d vfifo_center(left): dtap=%u => %u == %u \ - && %u", __func__, __LINE__, d, - sticky_bit_chk, - param->read_correct_mask, stop); - - if (stop == 1) { - break; - } else { - for (i = 0; i < RW_MGR_MEM_DQ_PER_READ_DQS; i++) { - if (bit_chk & 1) { - /* Remember a passing test as the - left_edge */ - left_edge[i] = d; - } else { - /* If a left edge has not been seen yet, - then a future passing test will mark - this edge as the right edge */ - if (left_edge[i] == - IO_IO_IN_DELAY_MAX + 1) { - right_edge[i] = -(d + 1); - } - } - bit_chk = bit_chk >> 1; - } - } - } - - /* Reset DQ delay chains to 0 */ - scc_mgr_apply_group_dq_in_delay(test_bgn, 0); - sticky_bit_chk = 0; - for (i = RW_MGR_MEM_DQ_PER_READ_DQS - 1;; i--) { - debug_cond(DLEVEL == 2, "%s:%d vfifo_center: left_edge[%u]: \ - %d right_edge[%u]: %d\n", __func__, __LINE__, - i, left_edge[i], i, right_edge[i]); - - /* - * Check for cases where we haven't found the left edge, - * which makes our assignment of the the right edge invalid. - * Reset it to the illegal value. - */ - if ((left_edge[i] == IO_IO_IN_DELAY_MAX + 1) && ( - right_edge[i] != IO_IO_IN_DELAY_MAX + 1)) { - right_edge[i] = IO_IO_IN_DELAY_MAX + 1; - debug_cond(DLEVEL == 2, "%s:%d vfifo_center: reset \ - right_edge[%u]: %d\n", __func__, __LINE__, - i, right_edge[i]); - } - - /* - * Reset sticky bit (except for bits where we have seen - * both the left and right edge). - */ - sticky_bit_chk = sticky_bit_chk << 1; - if ((left_edge[i] != IO_IO_IN_DELAY_MAX + 1) && - (right_edge[i] != IO_IO_IN_DELAY_MAX + 1)) { - sticky_bit_chk = sticky_bit_chk | 1; - } - - if (i == 0) - break; - } + search_left_edge(0, rank_bgn, write_group, read_group, test_bgn, + &bit_chk, &sticky_bit_chk, + left_edge, right_edge, use_read_test); /* Search for the right edge of the window for each bit */ ret = search_right_edge(0, rank_bgn, write_group, read_group, @@ -2792,7 +2847,6 @@ static uint32_t rw_mgr_mem_calibrate_writes_center(uint32_t rank_bgn, int32_t mid_min, orig_mid_min; int32_t new_dqs, start_dqs, shift_dq; int32_t dq_margin, dqs_margin, dm_margin; - uint32_t stop; uint32_t temp_dq_out1_delay; uint32_t addr; @@ -2819,87 +2873,9 @@ static uint32_t rw_mgr_mem_calibrate_writes_center(uint32_t rank_bgn, } /* Search for the left edge of the window for each bit */ - for (d = 0; d <= IO_IO_OUT1_DELAY_MAX; d++) { - scc_mgr_apply_group_dq_out1_delay(write_group, d); - - writel(0, &sdr_scc_mgr->update); - - /* - * Stop searching when the read test doesn't pass AND when - * we've seen a passing read on every bit. - */ - stop = !rw_mgr_mem_calibrate_write_test(rank_bgn, write_group, - 0, PASS_ONE_BIT, &bit_chk, 0); - sticky_bit_chk = sticky_bit_chk | bit_chk; - stop = stop && (sticky_bit_chk == param->write_correct_mask); - debug_cond(DLEVEL == 2, "write_center(left): dtap=%d => %u \ - == %u && %u [bit_chk= %u ]\n", - d, sticky_bit_chk, param->write_correct_mask, - stop, bit_chk); - - if (stop == 1) { - break; - } else { - for (i = 0; i < RW_MGR_MEM_DQ_PER_WRITE_DQS; i++) { - if (bit_chk & 1) { - /* - * Remember a passing test as the - * left_edge. - */ - left_edge[i] = d; - } else { - /* - * If a left edge has not been seen - * yet, then a future passing test will - * mark this edge as the right edge. - */ - if (left_edge[i] == - IO_IO_OUT1_DELAY_MAX + 1) { - right_edge[i] = -(d + 1); - } - } - debug_cond(DLEVEL == 2, "write_center[l,d=%d):", d); - debug_cond(DLEVEL == 2, "bit_chk_test=%d left_edge[%u]: %d", - (int)(bit_chk & 1), i, left_edge[i]); - debug_cond(DLEVEL == 2, "right_edge[%u]: %d\n", i, - right_edge[i]); - bit_chk = bit_chk >> 1; - } - } - } - - /* Reset DQ delay chains to 0 */ - scc_mgr_apply_group_dq_out1_delay(0); - sticky_bit_chk = 0; - for (i = RW_MGR_MEM_DQ_PER_WRITE_DQS - 1;; i--) { - debug_cond(DLEVEL == 2, "%s:%d write_center: left_edge[%u]: \ - %d right_edge[%u]: %d\n", __func__, __LINE__, - i, left_edge[i], i, right_edge[i]); - - /* - * Check for cases where we haven't found the left edge, - * which makes our assignment of the the right edge invalid. - * Reset it to the illegal value. - */ - if ((left_edge[i] == IO_IO_OUT1_DELAY_MAX + 1) && - (right_edge[i] != IO_IO_OUT1_DELAY_MAX + 1)) { - right_edge[i] = IO_IO_OUT1_DELAY_MAX + 1; - debug_cond(DLEVEL == 2, "%s:%d write_center: reset \ - right_edge[%u]: %d\n", __func__, __LINE__, - i, right_edge[i]); - } - - /* - * Reset sticky bit (except for bits where we have - * seen the left edge). - */ - sticky_bit_chk = sticky_bit_chk << 1; - if ((left_edge[i] != IO_IO_OUT1_DELAY_MAX + 1)) - sticky_bit_chk = sticky_bit_chk | 1; - - if (i == 0) - break; - } + search_left_edge(1, rank_bgn, write_group, 0, test_bgn, + &bit_chk, &sticky_bit_chk, + left_edge, right_edge, 0); /* Search for the right edge of the window for each bit */ ret = search_right_edge(1, rank_bgn, write_group, 0, -- 2.7.4