From ac8843553af34855d0331554c03280e66c4ea582 Mon Sep 17 00:00:00 2001 From: Angel Pons Date: Sun, 8 May 2022 00:05:41 +0200 Subject: [PATCH 21/26] haswell NRI: Add RcvEn training Implement the RcvEn (Receive Enable) calibration procedure. Change-Id: Ifbfa520f3e0486c56d0988ce67af2ddb9cf29888 Signed-off-by: Angel Pons --- .../intel/haswell/native_raminit/Makefile.inc | 1 + .../haswell/native_raminit/raminit_main.c | 1 + .../haswell/native_raminit/raminit_native.h | 14 + .../haswell/native_raminit/reg_structs.h | 13 + .../native_raminit/train_receive_enable.c | 561 ++++++++++++++++++ .../intel/haswell/registers/mchbar.h | 3 + 6 files changed, 593 insertions(+) create mode 100644 src/northbridge/intel/haswell/native_raminit/train_receive_enable.c diff --git a/src/northbridge/intel/haswell/native_raminit/Makefile.inc b/src/northbridge/intel/haswell/native_raminit/Makefile.inc index ebe9e9b762..e2fbfb4211 100644 --- a/src/northbridge/intel/haswell/native_raminit/Makefile.inc +++ b/src/northbridge/intel/haswell/native_raminit/Makefile.inc @@ -16,3 +16,4 @@ romstage-y += setup_wdb.c romstage-y += spd_bitmunching.c romstage-y += testing_io.c romstage-y += timings_refresh.c +romstage-y += train_receive_enable.c diff --git a/src/northbridge/intel/haswell/native_raminit/raminit_main.c b/src/northbridge/intel/haswell/native_raminit/raminit_main.c index 5e4674957d..7d444659c3 100644 --- a/src/northbridge/intel/haswell/native_raminit/raminit_main.c +++ b/src/northbridge/intel/haswell/native_raminit/raminit_main.c @@ -60,6 +60,7 @@ static const struct task_entry cold_boot[] = { { configure_memory_map, true, "MEMMAP", }, { do_jedec_init, true, "JEDECINIT", }, { pre_training, true, "PRETRAIN", }, + { train_receive_enable, true, "RCVET", }, }; /* Return a generic stepping value to make stepping checks simpler */ diff --git a/src/northbridge/intel/haswell/native_raminit/raminit_native.h b/src/northbridge/intel/haswell/native_raminit/raminit_native.h index 7c1a786780..a36ebfacd1 100644 --- a/src/northbridge/intel/haswell/native_raminit/raminit_native.h +++ b/src/northbridge/intel/haswell/native_raminit/raminit_native.h @@ -42,6 +42,9 @@ #define NUM_WDB_CL_MUX_SEEDS 3 #define NUM_CADB_MUX_SEEDS 3 +/* Specified in PI ticks. 64 PI ticks == 1 qclk */ +#define tDQSCK_DRIFT 64 + /* ZQ calibration types */ enum { ZQ_INIT, /* DDR3: ZQCL with tZQinit, LPDDR3: ZQ Init with tZQinit */ @@ -188,6 +191,7 @@ enum raminit_status { RAMINIT_STATUS_MPLL_INIT_FAILURE, RAMINIT_STATUS_POLL_TIMEOUT, RAMINIT_STATUS_REUT_ERROR, + RAMINIT_STATUS_RCVEN_FAILURE, RAMINIT_STATUS_UNSPECIFIED_ERROR, /** TODO: Deprecated in favor of specific values **/ }; @@ -270,6 +274,10 @@ struct sysinfo { union ddr_data_vref_adjust_reg dimm_vref; + uint8_t io_latency[NUM_CHANNELS][NUM_SLOTRANKS]; + uint8_t rt_latency[NUM_CHANNELS][NUM_SLOTRANKS]; + uint32_t rt_io_comp[NUM_CHANNELS]; + uint32_t data_offset_train[NUM_CHANNELS][NUM_LANES]; uint32_t data_offset_comp[NUM_CHANNELS][NUM_LANES]; @@ -344,6 +352,11 @@ static inline void clear_data_offset_train_all(struct sysinfo *ctrl) memset(ctrl->data_offset_train, 0, sizeof(ctrl->data_offset_train)); } +static inline uint32_t get_data_train_feedback(const uint8_t channel, const uint8_t byte) +{ + return mchbar_read32(DDR_DATA_TRAIN_FEEDBACK(channel, byte)); +} + /* Number of ticks to wait in units of 69.841279 ns (citation needed) */ static inline void tick_delay(const uint32_t delay) { @@ -401,6 +414,7 @@ enum raminit_status convert_timings(struct sysinfo *ctrl); enum raminit_status configure_mc(struct sysinfo *ctrl); enum raminit_status configure_memory_map(struct sysinfo *ctrl); enum raminit_status do_jedec_init(struct sysinfo *ctrl); +enum raminit_status train_receive_enable(struct sysinfo *ctrl); void configure_timings(struct sysinfo *ctrl); void configure_refresh(struct sysinfo *ctrl); diff --git a/src/northbridge/intel/haswell/native_raminit/reg_structs.h b/src/northbridge/intel/haswell/native_raminit/reg_structs.h index b943259b91..b099f4bb82 100644 --- a/src/northbridge/intel/haswell/native_raminit/reg_structs.h +++ b/src/northbridge/intel/haswell/native_raminit/reg_structs.h @@ -297,6 +297,19 @@ union ddr_scram_misc_control_reg { uint32_t raw; }; +union sc_io_latency_reg { + struct __packed { + uint32_t iolat_rank0 : 4; // Bits 3:0 + uint32_t iolat_rank1 : 4; // Bits 7:4 + uint32_t iolat_rank2 : 4; // Bits 11:8 + uint32_t iolat_rank3 : 4; // Bits 15:12 + uint32_t rt_iocomp : 6; // Bits 21:16 + uint32_t : 9; // Bits 30:22 + uint32_t dis_rt_clk_gate : 1; // Bits 31:31 + }; + uint32_t raw; +}; + union mcscheds_cbit_reg { struct __packed { uint32_t dis_opp_cas : 1; // Bits 0:0 diff --git a/src/northbridge/intel/haswell/native_raminit/train_receive_enable.c b/src/northbridge/intel/haswell/native_raminit/train_receive_enable.c new file mode 100644 index 0000000000..576c6bc21e --- /dev/null +++ b/src/northbridge/intel/haswell/native_raminit/train_receive_enable.c @@ -0,0 +1,561 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ + +#include +#include +#include + +#include "raminit_native.h" +#include "ranges.h" + +#define RCVEN_PLOT RAM_DEBUG + +static enum raminit_status change_rcven_timing(struct sysinfo *ctrl, const uint8_t channel) +{ + int16_t max_rcven = -4096; + int16_t min_rcven = 4096; + int16_t max_rcven_rank[NUM_SLOTRANKS]; + int16_t min_rcven_rank[NUM_SLOTRANKS]; + for (uint8_t rank = 0; rank < NUM_SLOTRANKS; rank++) { + max_rcven_rank[rank] = max_rcven; + min_rcven_rank[rank] = min_rcven; + } + for (uint8_t rank = 0; rank < NUM_SLOTRANKS; rank++) { + if (!rank_in_ch(ctrl, rank, channel)) + continue; + + for (uint8_t byte = 0; byte < ctrl->lanes; byte++) { + int16_t new_rcven = ctrl->rcven[channel][rank][byte]; + new_rcven -= ctrl->io_latency[channel][rank] * 64; + if (max_rcven_rank[rank] < new_rcven) + max_rcven_rank[rank] = new_rcven; + + if (min_rcven_rank[rank] > new_rcven) + min_rcven_rank[rank] = new_rcven; + } + if (max_rcven < max_rcven_rank[rank]) + max_rcven = max_rcven_rank[rank]; + + if (min_rcven > min_rcven_rank[rank]) + min_rcven = min_rcven_rank[rank]; + } + + /* + * Determine how far we are from the ideal center point for RcvEn timing. + * (PiIdeal - AveRcvEn) / 64 is the ideal number of cycles we should have + * for IO latency. command training will reduce this by 64, so plan for + * that now in the ideal value. Round to closest integer. + */ + const int16_t rre_pi_ideal = 256 + 64; + const int16_t pi_reserve = 64; + const int16_t rcven_center = (max_rcven + min_rcven) / 2; + const int8_t iolat_target = DIV_ROUND_CLOSEST(rre_pi_ideal - rcven_center, 64); + + int8_t io_g_offset = 0; + int8_t io_lat[NUM_SLOTRANKS] = { 0 }; + for (uint8_t rank = 0; rank < NUM_SLOTRANKS; rank++) { + if (!rank_in_ch(ctrl, rank, channel)) + continue; + + io_lat[rank] = iolat_target; + + /* Check for RcvEn underflow/overflow */ + const int16_t rcven_lower = 64 * io_lat[rank] + min_rcven_rank[rank]; + if (rcven_lower < pi_reserve) + io_lat[rank] += DIV_ROUND_UP(pi_reserve - rcven_lower, 64); + + const int16_t rcven_upper = 64 * io_lat[rank] + max_rcven_rank[rank]; + if (rcven_upper > 511 - pi_reserve) + io_lat[rank] -= DIV_ROUND_UP(rcven_upper - (511 - pi_reserve), 64); + + /* Check for IO latency over/underflow */ + if (io_lat[rank] - io_g_offset > 14) + io_g_offset = io_lat[rank] - 14; + + if (io_lat[rank] - io_g_offset < 1) + io_g_offset = io_lat[rank] - 1; + + const int8_t cycle_offset = io_lat[rank] - ctrl->io_latency[channel][rank]; + for (uint8_t byte = 0; byte < ctrl->lanes; byte++) { + ctrl->rcven[channel][rank][byte] += 64 * cycle_offset; + update_rxt(ctrl, channel, rank, byte, RXT_RESTORE, 0); + } + } + + /* Calculate new IO comp latency */ + union sc_io_latency_reg sc_io_lat = { + .raw = mchbar_read32(SC_IO_LATENCY_ch(channel)), + }; + + /* Check if we are underflowing or overflowing this field */ + if (io_g_offset < 0 && sc_io_lat.rt_iocomp < -io_g_offset) { + printk(BIOS_ERR, "%s: IO COMP underflow\n", __func__); + printk(BIOS_ERR, "io_g_offset: %d\n", io_g_offset); + printk(BIOS_ERR, "rt_iocomp: %u\n", sc_io_lat.rt_iocomp); + return RAMINIT_STATUS_RCVEN_FAILURE; + } + if (io_g_offset > 0 && io_g_offset > 0x3f - sc_io_lat.rt_iocomp) { + printk(BIOS_ERR, "%s: IO COMP overflow\n", __func__); + printk(BIOS_ERR, "io_g_offset: %d\n", io_g_offset); + printk(BIOS_ERR, "rt_iocomp: %u\n", sc_io_lat.rt_iocomp); + return RAMINIT_STATUS_RCVEN_FAILURE; + } + sc_io_lat.rt_iocomp += io_g_offset; + ctrl->rt_io_comp[channel] = sc_io_lat.rt_iocomp; + for (uint8_t rank = 0; rank < NUM_SLOTRANKS; rank++) { + if (ctrl->rankmap[channel] & BIT(rank)) + ctrl->io_latency[channel][rank] = io_lat[rank] - io_g_offset; + + const uint8_t shift = rank * 4; + sc_io_lat.raw &= ~(0xf << shift); + sc_io_lat.raw |= ctrl->io_latency[channel][rank] << shift; + } + mchbar_write32(SC_IO_LATENCY_ch(channel), sc_io_lat.raw); + return RAMINIT_STATUS_SUCCESS; +} + +#define RL_START (256 + 24) +#define RL_STOP (384 + 24) +#define RL_STEP 8 + +#define RE_NUM_SAMPLES 6 + +static enum raminit_status verify_high_region(const int32_t center, const int32_t lwidth) +{ + if (center > RL_STOP) { + /* Check if center of high was found where it should be */ + printk(BIOS_ERR, "RcvEn: Center of high (%d) higher than expected\n", center); + return RAMINIT_STATUS_RCVEN_FAILURE; + } + if (lwidth <= 32) { + /* Check if width is large enough */ + printk(BIOS_ERR, "RcvEn: Width of high region (%d) too small\n", lwidth); + return RAMINIT_STATUS_RCVEN_FAILURE; + } + if (lwidth >= 96) { + /* Since we're calibrating a phase, a too large region is a problem */ + printk(BIOS_ERR, "RcvEn: Width of high region (%d) too large\n", lwidth); + return RAMINIT_STATUS_RCVEN_FAILURE; + } + return RAMINIT_STATUS_SUCCESS; +} + +static void program_io_latency(struct sysinfo *ctrl, const uint8_t channel, const uint8_t rank) +{ + const uint8_t shift = rank * 4; + const uint8_t iolat = ctrl->io_latency[channel][rank]; + mchbar_clrsetbits32(SC_IO_LATENCY_ch(channel), 0xf << shift, iolat << shift); +} + +static void program_rl_delays(struct sysinfo *ctrl, const uint8_t rank, const uint16_t rl_delay) +{ + for (uint8_t channel = 0; channel < NUM_CHANNELS; channel++) { + if (!rank_in_ch(ctrl, rank, channel)) + continue; + + for (uint8_t byte = 0; byte < ctrl->lanes; byte++) + update_rxt(ctrl, channel, rank, byte, RXT_RCVEN, rl_delay); + } +} + +static bool sample_dqs(const uint8_t channel, const uint8_t byte) +{ + return (get_data_train_feedback(channel, byte) & 0x1ff) >= BIT(RE_NUM_SAMPLES - 1); +} + +enum raminit_status train_receive_enable(struct sysinfo *ctrl) +{ + const struct reut_box reut_addr = { + .col = { + .start = 0, + .stop = 1023, + .inc_rate = 0, + .inc_val = 1, + }, + }; + const struct wdb_pat wdb_pattern = { + .start_ptr = 0, + .stop_ptr = 9, + .inc_rate = 32, + .dq_pattern = BASIC_VA, + }; + + const uint16_t bytemask = BIT(ctrl->lanes) - 1; + const uint8_t fine_step = 1; + + const uint8_t rt_delta = is_hsw_ult() ? 4 : 2; + const uint8_t rt_io_comp = 21 + rt_delta; + const uint8_t rt_latency = 16 + rt_delta; + setup_io_test( + ctrl, + ctrl->chanmap, + PAT_RD, + 2, + RE_NUM_SAMPLES + 1, + &reut_addr, + 0, + &wdb_pattern, + 0, + 8); + + for (uint8_t channel = 0; channel < NUM_CHANNELS; channel++) { + if (!does_ch_exist(ctrl, channel)) + continue; + + for (uint8_t byte = 0; byte < ctrl->lanes; byte++) { + union ddr_data_control_2_reg data_control_2 = { + .raw = ctrl->dq_control_2[channel][byte], + }; + data_control_2.force_rx_on = 1; + mchbar_write32(DQ_CONTROL_2(channel, byte), data_control_2.raw); + } + union ddr_data_control_0_reg data_control_0 = { + .raw = ctrl->dq_control_0[channel], + }; + if (ctrl->lpddr) { + /** + * W/A for b4618574 - @todo: remove for HSW ULT C0 + * Can't have force_odt_on together with leaker, disable LPDDR + * mode during this training step. lpddr_mode is restored + * at the end of this function from the host structure. + */ + data_control_0.lpddr_mode = 0; + mchbar_write32(DDR_DATA_ch_CONTROL_0(channel), data_control_0.raw); + } + data_control_0.force_odt_on = 1; + data_control_0.rl_training_mode = 1; + mchbar_write32(DDR_DATA_ch_CONTROL_0(channel), data_control_0.raw); + mchbar_write32(SC_IO_LATENCY_ch(channel), (union sc_io_latency_reg) { + .rt_iocomp = rt_io_comp, + }.raw); + } + enum raminit_status status = RAMINIT_STATUS_SUCCESS; + for (uint8_t rank = 0; rank < NUM_SLOTRANKS; rank++) { + if (!does_rank_exist(ctrl, rank)) + continue; + + /* + * Set initial roundtrip latency values. Assume -4 QCLK for worst board + * layout. This is calculated as HW_ROUNDT_LAT_DEFAULT_VALUE plus: + * + * DDR3: Default + (2 * tAA) + 4 QCLK + PI_CLK + N-mode value * 2 + * LPDDR3: Default + (2 * tAA) + 4 QCLK + PI_CLK + tDQSCK_max + * + * N-mode is 3 during training mode. Both channels use the same timings. + */ + /** TODO: differs for LPDDR **/ + const uint32_t tmp = MAX(ctrl->multiplier, 4) + 5 + 2 * ctrl->tAA; + const uint32_t initial_rt_latency = MIN(rt_latency + tmp, 0x3f); + + uint8_t chanmask = 0; + for (uint8_t channel = 0; channel < NUM_CHANNELS; channel++) { + chanmask |= select_reut_ranks(ctrl, channel, BIT(rank)); + if (!rank_in_ch(ctrl, rank, channel)) + continue; + + ctrl->io_latency[channel][rank] = 0; + mchbar_write8(SC_ROUNDT_LAT_ch(channel) + rank, initial_rt_latency); + ctrl->rt_latency[channel][rank] = initial_rt_latency; + } + + printk(BIOS_DEBUG, "Rank %u\n", rank); + printk(BIOS_DEBUG, "Steps 1 and 2: Find middle of high region\n"); + printk(RCVEN_PLOT, "Byte"); + for (uint8_t channel = 0; channel < NUM_CHANNELS; channel++) { + if (!rank_in_ch(ctrl, rank, channel)) + continue; + + printk(RCVEN_PLOT, "\t"); + for (uint8_t byte = 0; byte < ctrl->lanes; byte++) + printk(RCVEN_PLOT, "%u ", byte); + } + printk(RCVEN_PLOT, "\nRcvEn\n"); + struct phase_train_data region_data[NUM_CHANNELS][NUM_LANES] = { 0 }; + for (uint16_t rl_delay = RL_START; rl_delay < RL_STOP; rl_delay += RL_STEP) { + printk(RCVEN_PLOT, " % 3d", rl_delay); + program_rl_delays(ctrl, rank, rl_delay); + run_io_test(ctrl, chanmask, BASIC_VA, true); + for (uint8_t channel = 0; channel < NUM_CHANNELS; channel++) { + if (!rank_in_ch(ctrl, rank, channel)) + continue; + + printk(RCVEN_PLOT, "\t"); + for (uint8_t byte = 0; byte < ctrl->lanes; byte++) { + const bool high = sample_dqs(channel, byte); + printk(RCVEN_PLOT, high ? ". " : "# "); + phase_record_pass( + ®ion_data[channel][byte], + high, + rl_delay, + RL_START, + RL_STEP); + } + } + printk(RCVEN_PLOT, "\n"); + } + printk(RCVEN_PLOT, "\n"); + printk(BIOS_DEBUG, "Update RcvEn timing to be in the center of high region\n"); + for (uint8_t channel = 0; channel < NUM_CHANNELS; channel++) { + if (!rank_in_ch(ctrl, rank, channel)) + continue; + + printk(BIOS_DEBUG, "C%u.R%u: \tLeft\tRight\tWidth\tCenter\n", + channel, rank); + for (uint8_t byte = 0; byte < ctrl->lanes; byte++) { + struct phase_train_data *const curr_data = + ®ion_data[channel][byte]; + phase_append_current_to_initial(curr_data, RL_START, RL_STEP); + const int32_t lwidth = range_width(curr_data->largest); + const int32_t center = range_center(curr_data->largest); + printk(BIOS_DEBUG, " B%u: \t%d\t%d\t%d\t%d\n", + byte, + curr_data->largest.start, + curr_data->largest.end, + lwidth, + center); + + status = verify_high_region(center, lwidth); + if (status) { + printk(BIOS_ERR, + "RcvEn problems on channel %u, byte %u\n", + channel, byte); + goto clean_up; + } + ctrl->rcven[channel][rank][byte] = center; + update_rxt(ctrl, channel, rank, byte, RXT_RESTORE, 0); + } + printk(BIOS_DEBUG, "\n"); + } + + printk(BIOS_DEBUG, "Step 3: Quarter preamble - Walk backwards\n"); + printk(RCVEN_PLOT, "Byte"); + for (uint8_t channel = 0; channel < NUM_CHANNELS; channel++) { + if (!rank_in_ch(ctrl, rank, channel)) + continue; + + printk(RCVEN_PLOT, "\t"); + for (uint8_t byte = 0; byte < ctrl->lanes; byte++) + printk(RCVEN_PLOT, "%u ", byte); + } + printk(RCVEN_PLOT, "\nIOLAT\n"); + bool done = false; + while (!done) { + run_io_test(ctrl, chanmask, BASIC_VA, true); + done = true; + for (uint8_t channel = 0; channel < NUM_CHANNELS; channel++) { + if (!rank_in_ch(ctrl, rank, channel)) + continue; + + printk(RCVEN_PLOT, " %2u\t", ctrl->io_latency[channel][rank]); + uint16_t highs = 0; + for (uint8_t byte = 0; byte < ctrl->lanes; byte++) { + const bool high = sample_dqs(channel, byte); + printk(RCVEN_PLOT, high ? "H " : "L "); + if (high) + highs |= BIT(byte); + } + if (!highs) + continue; + + done = false; + + /* If all bytes sample high, adjust timing globally */ + if (highs == bytemask && ctrl->io_latency[channel][rank] < 14) { + ctrl->io_latency[channel][rank] += 2; + ctrl->io_latency[channel][rank] %= 16; + program_io_latency(ctrl, channel, rank); + continue; + } + + /* Otherwise, adjust individual bytes */ + for (uint8_t byte = 0; byte < ctrl->lanes; byte++) { + if (!(highs & BIT(byte))) + continue; + + if (ctrl->rcven[channel][rank][byte] < 128) { + printk(BIOS_ERR, + "RcvEn underflow: walking backwards\n"); + printk(BIOS_ERR, + "For channel %u, rank %u, byte %u\n", + channel, rank, byte); + status = RAMINIT_STATUS_RCVEN_FAILURE; + goto clean_up; + } + ctrl->rcven[channel][rank][byte] -= 128; + update_rxt(ctrl, channel, rank, byte, RXT_RESTORE, 0); + } + } + printk(RCVEN_PLOT, "\n"); + } + for (uint8_t channel = 0; channel < NUM_CHANNELS; channel++) { + if (!rank_in_ch(ctrl, rank, channel)) + continue; + + printk(BIOS_DEBUG, "\nC%u: Preamble\n", channel); + for (uint8_t byte = 0; byte < ctrl->lanes; byte++) { + printk(BIOS_DEBUG, + " B%u: %u\n", byte, ctrl->rcven[channel][rank][byte]); + } + } + printk(BIOS_DEBUG, "\n"); + + printk(BIOS_DEBUG, "Step 4: Add 1 qclk\n"); + for (uint8_t channel = 0; channel < NUM_CHANNELS; channel++) { + if (!rank_in_ch(ctrl, rank, channel)) + continue; + + for (uint8_t byte = 0; byte < ctrl->lanes; byte++) { + ctrl->rcven[channel][rank][byte] += 64; + update_rxt(ctrl, channel, rank, byte, RXT_RESTORE, 0); + } + } + printk(BIOS_DEBUG, "\n"); + + printk(BIOS_DEBUG, "Step 5: Walk forward to find rising edge\n"); + printk(RCVEN_PLOT, "Byte"); + for (uint8_t channel = 0; channel < NUM_CHANNELS; channel++) { + if (!rank_in_ch(ctrl, rank, channel)) + continue; + + printk(RCVEN_PLOT, "\t"); + for (uint8_t byte = 0; byte < ctrl->lanes; byte++) + printk(RCVEN_PLOT, "%u ", byte); + } + printk(RCVEN_PLOT, "\n inc\n"); + uint16_t ch_result[NUM_CHANNELS] = { 0 }; + uint8_t inc_preamble[NUM_CHANNELS][NUM_LANES] = { 0 }; + for (uint8_t inc = 0; inc < 64; inc += fine_step) { + printk(RCVEN_PLOT, " %2u\t", inc); + run_io_test(ctrl, chanmask, BASIC_VA, true); + done = true; + for (uint8_t channel = 0; channel < NUM_CHANNELS; channel++) { + if (!rank_in_ch(ctrl, rank, channel)) + continue; + + for (uint8_t byte = 0; byte < ctrl->lanes; byte++) { + if (ch_result[channel] & BIT(byte)) { + /* Skip bytes that are already done */ + printk(RCVEN_PLOT, ". "); + continue; + } + const bool pass = sample_dqs(channel, byte); + printk(RCVEN_PLOT, pass ? ". " : "# "); + if (pass) { + ch_result[channel] |= BIT(byte); + continue; + } + ctrl->rcven[channel][rank][byte] += fine_step; + update_rxt(ctrl, channel, rank, byte, RXT_RESTORE, 0); + inc_preamble[channel][byte] = inc; + } + printk(RCVEN_PLOT, "\t"); + if (ch_result[channel] != bytemask) + done = false; + } + printk(RCVEN_PLOT, "\n"); + if (done) + break; + } + printk(BIOS_DEBUG, "\n"); + if (!done) { + printk(BIOS_ERR, "Error: Preamble edge not found for all bytes\n"); + printk(BIOS_ERR, "The final RcvEn results are as follows:\n"); + for (uint8_t channel = 0; channel < NUM_CHANNELS; channel++) { + if (!rank_in_ch(ctrl, rank, channel)) + continue; + + printk(BIOS_ERR, "Channel %u Rank %u: preamble\n", + channel, rank); + for (uint8_t byte = 0; byte < ctrl->lanes; byte++) { + printk(BIOS_ERR, " Byte %u: %u%s\n", byte, + ctrl->rcven[channel][rank][byte], + (ch_result[channel] ^ bytemask) & BIT(byte) + ? "" + : " *** Check this byte! ***"); + } + } + status = RAMINIT_STATUS_RCVEN_FAILURE; + goto clean_up; + } + + printk(BIOS_DEBUG, "Step 6: center on preamble and clean up rank\n"); + for (uint8_t channel = 0; channel < NUM_CHANNELS; channel++) { + if (!rank_in_ch(ctrl, rank, channel)) + continue; + + printk(BIOS_DEBUG, "C%u: Preamble increment\n", channel); + for (uint8_t byte = 0; byte < ctrl->lanes; byte++) { + /* + * For Traditional, pull in RcvEn by 64. For ULT, take the DQS + * drift into account to the specified guardband: tDQSCK_DRIFT. + */ + ctrl->rcven[channel][rank][byte] -= tDQSCK_DRIFT; + update_rxt(ctrl, channel, rank, byte, RXT_RESTORE, 0); + printk(BIOS_DEBUG, " B%u: %u %u\n", byte, + ctrl->rcven[channel][rank][byte], + inc_preamble[channel][byte]); + } + printk(BIOS_DEBUG, "\n"); + } + printk(BIOS_DEBUG, "\n"); + } + +clean_up: + for (uint8_t channel = 0; channel < NUM_CHANNELS; channel++) { + if (!does_ch_exist(ctrl, channel)) + continue; + + if (ctrl->lpddr) { + /** + * W/A for b4618574 - @todo: remove for HSW ULT C0 + * Can't have force_odt_on together with leaker, disable LPDDR mode for + * this training step. This write will disable force_odt_on while still + * keeping LPDDR mode disabled. Second write will restore LPDDR mode. + */ + union ddr_data_control_0_reg data_control_0 = { + .raw = ctrl->dq_control_0[channel], + }; + data_control_0.lpddr_mode = 0; + mchbar_write32(DDR_DATA_ch_CONTROL_0(channel), data_control_0.raw); + } + mchbar_write32(DDR_DATA_ch_CONTROL_0(channel), ctrl->dq_control_0[channel]); + for (uint8_t byte = 0; byte < ctrl->lanes; byte++) { + mchbar_write32(DQ_CONTROL_2(channel, byte), + ctrl->dq_control_2[channel][byte]); + } + } + io_reset(); + if (status) + return status; + + printk(BIOS_DEBUG, "Step 7: Sync IO latency across all ranks\n"); + for (uint8_t channel = 0; channel < NUM_CHANNELS; channel++) { + if (!does_ch_exist(ctrl, channel)) + continue; + + status = change_rcven_timing(ctrl, channel); + if (status) + return status; + } + printk(BIOS_DEBUG, "\nFinal Receive Enable and IO latency settings:\n"); + for (uint8_t channel = 0; channel < NUM_CHANNELS; channel++) { + if (!does_ch_exist(ctrl, channel)) + continue; + + for (uint8_t rank = 0; rank < NUM_SLOTRANKS; rank++) { + if (!rank_in_ch(ctrl, rank, channel)) + continue; + + const union sc_io_latency_reg sc_io_latency = { + .raw = mchbar_read32(SC_IO_LATENCY_ch(channel)), + }; + printk(BIOS_DEBUG, " C%u.R%u: IOLAT = %u rt_iocomp = %u\n", channel, + rank, ctrl->io_latency[channel][rank], sc_io_latency.rt_iocomp); + for (uint8_t byte = 0; byte < ctrl->lanes; byte++) { + printk(BIOS_DEBUG, " B%u: %u\n", byte, + ctrl->rcven[channel][rank][byte]); + } + printk(BIOS_DEBUG, "\n"); + } + } + return status; +} diff --git a/src/northbridge/intel/haswell/registers/mchbar.h b/src/northbridge/intel/haswell/registers/mchbar.h index a81559bb1e..9172d4f2b0 100644 --- a/src/northbridge/intel/haswell/registers/mchbar.h +++ b/src/northbridge/intel/haswell/registers/mchbar.h @@ -18,6 +18,8 @@ #define RX_TRAIN_ch_r_b(ch, rank, byte) _DDRIO_C_R_B(0x0000, ch, rank, byte) #define TX_TRAIN_ch_r_b(ch, rank, byte) _DDRIO_C_R_B(0x0020, ch, rank, byte) +#define DDR_DATA_TRAIN_FEEDBACK(ch, byte) _DDRIO_C_R_B(0x0054, ch, 0, byte) + #define DQ_CONTROL_2(ch, byte) _DDRIO_C_R_B(0x0064, ch, 0, byte) #define DQ_CONTROL_0(ch, byte) _DDRIO_C_R_B(0x0074, ch, 0, byte) @@ -100,6 +102,7 @@ #define COMMAND_RATE_LIMIT_ch(ch) _MCMAIN_C(0x4010, ch) #define TC_BANK_RANK_D_ch(ch) _MCMAIN_C(0x4014, ch) #define SC_ROUNDT_LAT_ch(ch) _MCMAIN_C(0x4024, ch) +#define SC_IO_LATENCY_ch(ch) _MCMAIN_C(0x4028, ch) #define REUT_ch_PAT_WDB_CL_MUX_CFG(ch) _MCMAIN_C(0x4040, ch) -- 2.39.2