From 6781cec818501f7afd6ee26464fd4556ac3068cb Mon Sep 17 00:00:00 2001 From: Angel Pons <th3fanbus@gmail.com> Date: Sun, 8 May 2022 11:35:49 +0200 Subject: [PATCH 23/26] haswell NRI: Add read MPR training Implement read training using DDR3 MPR (Multi-Purpose Register). Change-Id: Id17cb2c4c399ac9bcc937b595b58f863c152461b Signed-off-by: Angel Pons <th3fanbus@gmail.com> --- .../intel/haswell/native_raminit/Makefile.inc | 1 + .../haswell/native_raminit/raminit_main.c | 1 + .../haswell/native_raminit/raminit_native.h | 4 + .../haswell/native_raminit/train_read_mpr.c | 240 ++++++++++++++++++ .../intel/haswell/registers/mchbar.h | 2 +- 5 files changed, 247 insertions(+), 1 deletion(-) create mode 100644 src/northbridge/intel/haswell/native_raminit/train_read_mpr.c diff --git a/src/northbridge/intel/haswell/native_raminit/Makefile.inc b/src/northbridge/intel/haswell/native_raminit/Makefile.inc index e2fbfb4211..c442be0728 100644 --- a/src/northbridge/intel/haswell/native_raminit/Makefile.inc +++ b/src/northbridge/intel/haswell/native_raminit/Makefile.inc @@ -16,4 +16,5 @@ romstage-y += setup_wdb.c romstage-y += spd_bitmunching.c romstage-y += testing_io.c romstage-y += timings_refresh.c +romstage-y += train_read_mpr.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 7d444659c3..264d1468f5 100644 --- a/src/northbridge/intel/haswell/native_raminit/raminit_main.c +++ b/src/northbridge/intel/haswell/native_raminit/raminit_main.c @@ -61,6 +61,7 @@ static const struct task_entry cold_boot[] = { { do_jedec_init, true, "JEDECINIT", }, { pre_training, true, "PRETRAIN", }, { train_receive_enable, true, "RCVET", }, + { train_read_mpr, true, "RDMPRT", }, }; /* 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 500fc28909..a7551ad63c 100644 --- a/src/northbridge/intel/haswell/native_raminit/raminit_native.h +++ b/src/northbridge/intel/haswell/native_raminit/raminit_native.h @@ -27,6 +27,8 @@ /* Always use 12 legs for emphasis (not trained) */ #define TXEQFULLDRV (3 << 4) +#define LOOPCOUNT_INFINITE 0xff + /* DDR3 mode register bits */ #define MR0_DLL_RESET BIT(8) @@ -212,6 +214,7 @@ enum raminit_status { RAMINIT_STATUS_POLL_TIMEOUT, RAMINIT_STATUS_REUT_ERROR, RAMINIT_STATUS_RCVEN_FAILURE, + RAMINIT_STATUS_RMPR_FAILURE, RAMINIT_STATUS_UNSPECIFIED_ERROR, /** TODO: Deprecated in favor of specific values **/ }; @@ -435,6 +438,7 @@ 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); +enum raminit_status train_read_mpr(struct sysinfo *ctrl); void configure_timings(struct sysinfo *ctrl); void configure_refresh(struct sysinfo *ctrl); diff --git a/src/northbridge/intel/haswell/native_raminit/train_read_mpr.c b/src/northbridge/intel/haswell/native_raminit/train_read_mpr.c new file mode 100644 index 0000000000..0225e1a384 --- /dev/null +++ b/src/northbridge/intel/haswell/native_raminit/train_read_mpr.c @@ -0,0 +1,240 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ + +#include <commonlib/clamp.h> +#include <console/console.h> +#include <delay.h> +#include <northbridge/intel/haswell/haswell.h> +#include <types.h> + +#include "raminit_native.h" +#include "ranges.h" + +#define RMPR_START (-32) +#define RMPR_STOP (32) +#define RMPR_STEP 1 + +#define RMPR_MIN_WIDTH 12 + +#define RMPR_PLOT RAM_DEBUG + +/* + * Clear rx_training_mode. For LPDDR, we first need to disable odt_samp_extend_en, + * then disable rx_training_mode, and finally re-enable odt_samp_extend_en. + */ +static void clear_rx_training_mode(struct sysinfo *ctrl, const uint8_t channel) +{ + for (uint8_t byte = 0; byte < ctrl->lanes; byte++) + mchbar_write32(DQ_CONTROL_2(channel, byte), ctrl->dq_control_2[channel][byte]); + + if (ctrl->lpddr) { + union ddr_data_control_0_reg data_control_0 = { + .raw = mchbar_read32(DDR_DATA_ch_CONTROL_0(channel)), + }; + data_control_0.odt_samp_extend_en = 0; + mchbar_write32(DDR_DATA_ch_CONTROL_0(channel), data_control_0.raw); + tick_delay(1); + data_control_0.rx_training_mode = 0; + mchbar_write32(DDR_DATA_ch_CONTROL_0(channel), data_control_0.raw); + tick_delay(1); + } + mchbar_write32(DDR_DATA_ch_CONTROL_0(channel), ctrl->dq_control_0[channel]); +} + +static void set_rxdqs_edges_to_midpoint(struct sysinfo *ctrl) +{ + 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; + + for (uint8_t byte = 0; byte < ctrl->lanes; byte++) + update_rxt(ctrl, channel, rank, byte, RXT_RXDQS_BOTH, 32); + } + } +} + +static void enter_mpr_train_ddr_mode(struct sysinfo *ctrl, const uint8_t rank) +{ + /* Program MR3 and mask RAS/WE to prevent scheduler from issuing non-read commands */ + for (uint8_t channel = 0; channel < NUM_CHANNELS; channel++) { + if (!rank_in_ch(ctrl, rank, channel)) + continue; + + if (!ctrl->lpddr) + reut_issue_mrs(ctrl, channel, BIT(rank), 3, 1 << 2); + + union reut_misc_odt_ctrl_reg reut_misc_odt_ctrl = { + .raw = mchbar_read32(REUT_ch_MISC_ODT_CTRL(channel)), + }; + reut_misc_odt_ctrl.mpr_train_ddr_on = 1; + mchbar_write32(REUT_ch_MISC_ODT_CTRL(channel), reut_misc_odt_ctrl.raw); + } +} + +static void leave_mpr_train_ddr_mode(struct sysinfo *ctrl, const uint8_t rank) +{ + for (uint8_t channel = 0; channel < NUM_CHANNELS; channel++) { + if (!rank_in_ch(ctrl, rank, channel)) + continue; + + /* + * The mpr_train_ddr_on bit will force a special command. + * Therefore, clear it before issuing the MRS command. + */ + union reut_misc_odt_ctrl_reg reut_misc_odt_ctrl = { + .raw = mchbar_read32(REUT_ch_MISC_ODT_CTRL(channel)), + }; + reut_misc_odt_ctrl.mpr_train_ddr_on = 0; + mchbar_write32(REUT_ch_MISC_ODT_CTRL(channel), reut_misc_odt_ctrl.raw); + if (!ctrl->lpddr) + reut_issue_mrs(ctrl, channel, BIT(rank), 3, 0 << 2); + } +} + +enum raminit_status train_read_mpr(struct sysinfo *ctrl) +{ + set_rxdqs_edges_to_midpoint(ctrl); + clear_data_offset_train_all(ctrl); + setup_io_test_mpr(ctrl, ctrl->chanmap, LOOPCOUNT_INFINITE, NSOE); + enum raminit_status status = RAMINIT_STATUS_SUCCESS; + for (uint8_t rank = 0; rank < NUM_SLOTRANKS; rank++) { + if (!does_rank_exist(ctrl, rank)) + continue; + + printk(BIOS_DEBUG, "Rank %u\n", rank); + printk(RMPR_PLOT, "Channel"); + for (uint8_t channel = 0; channel < NUM_CHANNELS; channel++) { + if (!rank_in_ch(ctrl, rank, channel)) + continue; + + printk(RMPR_PLOT, "\t%u\t\t", channel); + } + printk(RMPR_PLOT, "\nByte"); + for (uint8_t channel = 0; channel < NUM_CHANNELS; channel++) { + if (!rank_in_ch(ctrl, rank, channel)) + continue; + + printk(RMPR_PLOT, "\t"); + for (uint8_t byte = 0; byte < ctrl->lanes; byte++) + printk(RMPR_PLOT, "%u ", byte); + } + enter_mpr_train_ddr_mode(ctrl, rank); + struct linear_train_data region_data[NUM_CHANNELS][NUM_LANES] = { 0 }; + for (uint8_t channel = 0; channel < NUM_CHANNELS; channel++) + select_reut_ranks(ctrl, channel, BIT(rank)); + + printk(RMPR_PLOT, "\nDqsDelay\n"); + int8_t dqs_delay; + for (dqs_delay = RMPR_START; dqs_delay < RMPR_STOP; dqs_delay += RMPR_STEP) { + printk(RMPR_PLOT, "% 5d", dqs_delay); + const enum regfile_mode regfile = REG_FILE_USE_START; + change_1d_margin_multicast(ctrl, RdT, dqs_delay, 0, false, regfile); + 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++) { + union ddr_data_control_2_reg data_control_2 = { + .raw = ctrl->dq_control_2[channel][byte], + }; + data_control_2.force_bias_on = 1; + data_control_2.force_rx_on = 1; + data_control_2.leaker_comp = 0; + 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], + }; + data_control_0.rx_training_mode = 1; + data_control_0.force_odt_on = !ctrl->lpddr; + data_control_0.en_read_preamble = 0; + data_control_0.odt_samp_extend_en = ctrl->lpddr; + const uint32_t reg_offset = DDR_DATA_ch_CONTROL_0(channel); + mchbar_write32(reg_offset, data_control_0.raw); + } + run_mpr_io_test(false); + for (uint8_t channel = 0; channel < NUM_CHANNELS; channel++) { + if (!rank_in_ch(ctrl, rank, channel)) + continue; + + printk(RMPR_PLOT, "\t"); + for (uint8_t byte = 0; byte < ctrl->lanes; byte++) { + uint32_t fb = get_data_train_feedback(channel, byte); + const bool pass = fb == 1; + printk(RMPR_PLOT, pass ? ". " : "# "); + linear_record_pass( + ®ion_data[channel][byte], + pass, + dqs_delay, + RMPR_START, + RMPR_STEP); + } + } + printk(RMPR_PLOT, "\n"); + for (uint8_t channel = 0; channel < NUM_CHANNELS; channel++) { + if (!rank_in_ch(ctrl, rank, channel)) + continue; + + clear_rx_training_mode(ctrl, channel); + } + io_reset(); + } + printk(RMPR_PLOT, "\n"); + leave_mpr_train_ddr_mode(ctrl, rank); + clear_data_offset_train_all(ctrl); + 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\tRxDqsPN\n", + channel, rank); + for (uint8_t byte = 0; byte < ctrl->lanes; byte++) { + struct linear_train_data *data = ®ion_data[channel][byte]; + const int32_t lwidth = range_width(data->largest); + if (lwidth <= RMPR_MIN_WIDTH) { + printk(BIOS_ERR, + "Bad eye (lwidth %d <= min %d) for byte %u\n", + lwidth, RMPR_MIN_WIDTH, byte); + status = RAMINIT_STATUS_RMPR_FAILURE; + } + /* + * The MPR center may not be ideal on certain platforms for + * unknown reasons. If so, adjust it with a magical number. + * For Haswell, the magical number is zero. Hell knows why. + */ + const int32_t center = range_center(data->largest); + ctrl->rxdqsp[channel][rank][byte] = center - RMPR_START; + ctrl->rxdqsn[channel][rank][byte] = center - RMPR_START; + printk(BIOS_DEBUG, " B%u: \t%d\t%d\t%d\t%d\t%u\n", byte, + data->largest.start, data->largest.end, lwidth, + center, ctrl->rxdqsp[channel][rank][byte]); + } + printk(BIOS_DEBUG, "\n"); + } + } + + /* + * Now program the DQS center values on populated ranks. data is taken from + * the host struct. We need to do it after all ranks are trained, because we + * need to keep the same DQS value on all ranks during the training procedure. + */ + 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; + + for (uint8_t byte = 0; byte < ctrl->lanes; byte++) + update_rxt(ctrl, channel, rank, byte, RXT_RESTORE, 0); + } + } + change_1d_margin_multicast(ctrl, RdT, 0, 0, false, REG_FILE_USE_CURRENT); + io_reset(); + return status; +} diff --git a/src/northbridge/intel/haswell/registers/mchbar.h b/src/northbridge/intel/haswell/registers/mchbar.h index 0acafbc826..6a31d3a32c 100644 --- a/src/northbridge/intel/haswell/registers/mchbar.h +++ b/src/northbridge/intel/haswell/registers/mchbar.h @@ -122,7 +122,7 @@ #define REUT_ch_ERR_DATA_MASK(ch) _MCMAIN_C(0x40d8, ch) #define REUT_ch_MISC_CKE_CTRL(ch) _MCMAIN_C(0x4190, ch) - +#define REUT_ch_MISC_ODT_CTRL(ch) _MCMAIN_C(0x4194, ch) #define REUT_ch_MISC_PAT_CADB_CTRL(ch) _MCMAIN_C(0x4198, ch) #define REUT_ch_PAT_CADB_MRS(ch) _MCMAIN_C(0x419c, ch) #define REUT_ch_PAT_CADB_MUX_CTRL(ch) _MCMAIN_C(0x41a0, ch) -- 2.39.2