From ffb8b66ea834f17cfd8a447919d5ac85cba66fd0 Mon Sep 17 00:00:00 2001 From: Marek Vasut Date: Sat, 18 Jul 2015 19:46:26 +0200 Subject: [PATCH] ddr: altera: Clean up rw_mgr_mem_calibrate_vfifo_center() part 6 Factor out center_dq_windows(), which is common code between stage 2 and stage 3 of the calibration again and cater for the minor differences. Signed-off-by: Marek Vasut --- drivers/ddr/altera/sequencer.c | 177 ++++++++++++++++----------------- 1 file changed, 88 insertions(+), 89 deletions(-) diff --git a/drivers/ddr/altera/sequencer.c b/drivers/ddr/altera/sequencer.c index d6b96f4caa..e3cd8a9763 100644 --- a/drivers/ddr/altera/sequencer.c +++ b/drivers/ddr/altera/sequencer.c @@ -2115,13 +2115,90 @@ static int get_window_mid_index(const int write, int *left_edge, return min_index; } +/** + * center_dq_windows() - Center the DQ/DQS windows + * @write: Perform read (Stage 2) or write (Stage 3) calibration + * @left_edge: Left edge of the DQ/DQS phase + * @right_edge: Right edge of the DQ/DQS phase + * @mid_min: Adjusted DQ/DQS phase middle setting + * @orig_mid_min: Original DQ/DQS phase middle setting + * @min_index: DQ/DQS phase middle setting index + * @test_bgn: Rank number to begin the test + * @dq_margin: Amount of shift for the DQ + * @dqs_margin: Amount of shift for the DQS + * + * Align the DQ/DQS windows in each group. + */ +static void center_dq_windows(const int write, int *left_edge, int *right_edge, + const int mid_min, const int orig_mid_min, + const int min_index, const int test_bgn, + int *dq_margin, int *dqs_margin) +{ + const u32 delay_max = write ? IO_IO_OUT1_DELAY_MAX : IO_IO_IN_DELAY_MAX; + const u32 per_dqs = write ? RW_MGR_MEM_DQ_PER_WRITE_DQS : + RW_MGR_MEM_DQ_PER_READ_DQS; + const u32 delay_off = write ? SCC_MGR_IO_OUT1_DELAY_OFFSET : + SCC_MGR_IO_IN_DELAY_OFFSET; + const u32 addr = SDR_PHYGRP_SCCGRP_ADDRESS | delay_off; + + u32 temp_dq_io_delay1, temp_dq_io_delay2; + int shift_dq, i, p; + + /* Initialize data for export structures */ + *dqs_margin = delay_max + 1; + *dq_margin = delay_max + 1; + + /* add delay to bring centre of all DQ windows to the same "level" */ + for (i = 0, p = test_bgn; i < per_dqs; i++, p++) { + /* Use values before divide by 2 to reduce round off error */ + shift_dq = (left_edge[i] - right_edge[i] - + (left_edge[min_index] - right_edge[min_index]))/2 + + (orig_mid_min - mid_min); + + debug_cond(DLEVEL == 2, + "vfifo_center: before: shift_dq[%u]=%d\n", + i, shift_dq); + + temp_dq_io_delay1 = readl(addr + (p << 2)); + temp_dq_io_delay2 = readl(addr + (i << 2)); + + if (shift_dq + temp_dq_io_delay1 > delay_max) + shift_dq = delay_max - temp_dq_io_delay2; + else if (shift_dq + temp_dq_io_delay1 < 0) + shift_dq = -temp_dq_io_delay1; + + debug_cond(DLEVEL == 2, + "vfifo_center: after: shift_dq[%u]=%d\n", + i, shift_dq); + + if (write) + scc_mgr_set_dq_out1_delay(i, temp_dq_io_delay1 + shift_dq); + else + scc_mgr_set_dq_in_delay(p, temp_dq_io_delay1 + shift_dq); + + scc_mgr_load_dq(p); + + debug_cond(DLEVEL == 2, + "vfifo_center: margin[%u]=[%d,%d]\n", i, + left_edge[i] - shift_dq + (-mid_min), + right_edge[i] + shift_dq - (-mid_min)); + + /* To determine values for export structures */ + if (left_edge[i] - shift_dq + (-mid_min) < *dq_margin) + *dq_margin = left_edge[i] - shift_dq + (-mid_min); + + if (right_edge[i] + shift_dq - (-mid_min) < *dqs_margin) + *dqs_margin = right_edge[i] + shift_dq - (-mid_min); + } + +} + /* per-bit deskew DQ and center */ 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 p, min_index; - int i; + int i, min_index; /* * Store these as signed since there are comparisons with * signed numbers. @@ -2130,13 +2207,9 @@ static uint32_t rw_mgr_mem_calibrate_vfifo_center(uint32_t rank_bgn, uint32_t sticky_bit_chk; int32_t left_edge[RW_MGR_MEM_DQ_PER_READ_DQS]; int32_t right_edge[RW_MGR_MEM_DQ_PER_READ_DQS]; - int32_t final_dq[RW_MGR_MEM_DQ_PER_READ_DQS]; - int32_t mid; int32_t orig_mid_min, mid_min; - int32_t new_dqs, start_dqs, start_dqs_en, shift_dq, final_dqs, - final_dqs_en; + int32_t new_dqs, start_dqs, start_dqs_en, final_dqs, final_dqs_en; int32_t dq_margin, dqs_margin; - uint32_t temp_dq_in_delay1, temp_dq_in_delay2; uint32_t addr; int ret; @@ -2225,49 +2298,9 @@ static uint32_t rw_mgr_mem_calibrate_vfifo_center(uint32_t rank_bgn, IO_SHIFT_DQS_EN_WHEN_SHIFT_DQS ? start_dqs_en : -1, new_dqs, mid_min); - /* Initialize data for export structures */ - dqs_margin = IO_IO_IN_DELAY_MAX + 1; - dq_margin = IO_IO_IN_DELAY_MAX + 1; - - /* add delay to bring centre of all DQ windows to the same "level" */ - for (i = 0, p = test_bgn; i < RW_MGR_MEM_DQ_PER_READ_DQS; i++, p++) { - /* Use values before divide by 2 to reduce round off error */ - shift_dq = (left_edge[i] - right_edge[i] - - (left_edge[min_index] - right_edge[min_index]))/2 + - (orig_mid_min - mid_min); - - debug_cond(DLEVEL == 2, - "vfifo_center: before: shift_dq[%u]=%d\n", - i, shift_dq); - - addr = SDR_PHYGRP_SCCGRP_ADDRESS | SCC_MGR_IO_IN_DELAY_OFFSET; - temp_dq_in_delay1 = readl(addr + (p << 2)); - temp_dq_in_delay2 = readl(addr + (i << 2)); - - if (shift_dq + temp_dq_in_delay1 > IO_IO_IN_DELAY_MAX) - shift_dq = IO_IO_IN_DELAY_MAX - temp_dq_in_delay2; - else if (shift_dq + temp_dq_in_delay1 < 0) - shift_dq = -temp_dq_in_delay1; - - debug_cond(DLEVEL == 2, - "vfifo_center: after: shift_dq[%u]=%d\n", - i, shift_dq); - final_dq[i] = temp_dq_in_delay1 + shift_dq; - scc_mgr_set_dq_in_delay(p, final_dq[i]); - scc_mgr_load_dq(p); - - debug_cond(DLEVEL == 2, - "vfifo_center: margin[%u]=[%d,%d]\n", i, - left_edge[i] - shift_dq + (-mid_min), - right_edge[i] + shift_dq - (-mid_min)); - - /* To determine values for export structures */ - if (left_edge[i] - shift_dq + (-mid_min) < dq_margin) - dq_margin = left_edge[i] - shift_dq + (-mid_min); - - if (right_edge[i] + shift_dq - (-mid_min) < dqs_margin) - dqs_margin = right_edge[i] + shift_dq - (-mid_min); - } + /* Add delay to bring centre of all DQ windows to the same "level". */ + center_dq_windows(0, left_edge, right_edge, mid_min, orig_mid_min, + min_index, test_bgn, &dq_margin, &dqs_margin); final_dqs = new_dqs; if (IO_SHIFT_DQS_EN_WHEN_SHIFT_DQS) @@ -2852,7 +2885,7 @@ static uint32_t rw_mgr_mem_calibrate_write_test(uint32_t rank_bgn, static uint32_t rw_mgr_mem_calibrate_writes_center(uint32_t rank_bgn, uint32_t write_group, uint32_t test_bgn) { - uint32_t i, p, min_index; + uint32_t i, min_index; int32_t d; /* * Store these as signed since there are comparisons with @@ -2864,9 +2897,8 @@ static uint32_t rw_mgr_mem_calibrate_writes_center(uint32_t rank_bgn, int32_t right_edge[RW_MGR_MEM_DQ_PER_WRITE_DQS]; int32_t mid; int32_t mid_min, orig_mid_min; - int32_t new_dqs, start_dqs, shift_dq; + int32_t new_dqs, start_dqs; int32_t dq_margin, dqs_margin, dm_margin; - uint32_t temp_dq_out1_delay; uint32_t addr; int ret; @@ -2915,43 +2947,10 @@ static uint32_t rw_mgr_mem_calibrate_writes_center(uint32_t rank_bgn, mid_min = 0; debug_cond(DLEVEL == 1, "%s:%d write_center: start_dqs=%d new_dqs=%d \ mid_min=%d\n", __func__, __LINE__, start_dqs, new_dqs, mid_min); - /* Initialize data for export structures */ - dqs_margin = IO_IO_OUT1_DELAY_MAX + 1; - dq_margin = IO_IO_OUT1_DELAY_MAX + 1; - - /* add delay to bring centre of all DQ windows to the same "level" */ - for (i = 0, p = test_bgn; i < RW_MGR_MEM_DQ_PER_WRITE_DQS; i++, p++) { - /* Use values before divide by 2 to reduce round off error */ - shift_dq = (left_edge[i] - right_edge[i] - - (left_edge[min_index] - right_edge[min_index]))/2 + - (orig_mid_min - mid_min); - - debug_cond(DLEVEL == 2, "%s:%d write_center: before: shift_dq \ - [%u]=%d\n", __func__, __LINE__, i, shift_dq); - - addr = SDR_PHYGRP_SCCGRP_ADDRESS | SCC_MGR_IO_OUT1_DELAY_OFFSET; - temp_dq_out1_delay = readl(addr + (i << 2)); - if (shift_dq + (int32_t)temp_dq_out1_delay > - (int32_t)IO_IO_OUT1_DELAY_MAX) { - shift_dq = (int32_t)IO_IO_OUT1_DELAY_MAX - temp_dq_out1_delay; - } else if (shift_dq + (int32_t)temp_dq_out1_delay < 0) { - shift_dq = -(int32_t)temp_dq_out1_delay; - } - debug_cond(DLEVEL == 2, "write_center: after: shift_dq[%u]=%d\n", - i, shift_dq); - scc_mgr_set_dq_out1_delay(i, temp_dq_out1_delay + shift_dq); - scc_mgr_load_dq(i); - debug_cond(DLEVEL == 2, "write_center: margin[%u]=[%d,%d]\n", i, - left_edge[i] - shift_dq + (-mid_min), - right_edge[i] + shift_dq - (-mid_min)); - /* To determine values for export structures */ - if (left_edge[i] - shift_dq + (-mid_min) < dq_margin) - dq_margin = left_edge[i] - shift_dq + (-mid_min); - - if (right_edge[i] + shift_dq - (-mid_min) < dqs_margin) - dqs_margin = right_edge[i] + shift_dq - (-mid_min); - } + /* Add delay to bring centre of all DQ windows to the same "level". */ + center_dq_windows(1, left_edge, right_edge, mid_min, orig_mid_min, + min_index, 0, &dq_margin, &dqs_margin); /* Move DQS */ scc_mgr_apply_group_dqs_io_and_oct_out1(write_group, new_dqs); -- 2.25.1