diff options
Diffstat (limited to 'board/freescale/t104xrdb/ddr.c')
| -rw-r--r-- | board/freescale/t104xrdb/ddr.c | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/board/freescale/t104xrdb/ddr.c b/board/freescale/t104xrdb/ddr.c new file mode 100644 index 0000000000..8f58dd6832 --- /dev/null +++ b/board/freescale/t104xrdb/ddr.c @@ -0,0 +1,132 @@ +/* + * Copyright 2013 Freescale Semiconductor, Inc. + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <i2c.h> +#include <hwconfig.h> +#include <asm/mmu.h> +#include <asm/fsl_ddr_sdram.h> +#include <asm/fsl_ddr_dimm_params.h> +#include <asm/fsl_law.h> +#include "ddr.h" + +DECLARE_GLOBAL_DATA_PTR; + +int fsl_ddr_get_dimm_params(dimm_params_t *pdimm, + unsigned int controller_number, + unsigned int dimm_number) +{ + const char dimm_model[] = "RAW timing DDR"; + + if ((controller_number == 0) && (dimm_number == 0)) { + memcpy(pdimm, &ddr_raw_timing, sizeof(dimm_params_t)); + memset(pdimm->mpart, 0, sizeof(pdimm->mpart)); + memcpy(pdimm->mpart, dimm_model, sizeof(dimm_model) - 1); + } + + return 0; +} + +void fsl_ddr_board_options(memctl_options_t *popts, + dimm_params_t *pdimm, + unsigned int ctrl_num) +{ + const struct board_specific_parameters *pbsp, *pbsp_highest = NULL; + ulong ddr_freq; + + if (ctrl_num > 1) { + printf("Not supported controller number %d\n", ctrl_num); + return; + } + if (!pdimm->n_ranks) + return; + + pbsp = udimms[0]; + + /* Get clk_adjust, cpo, write_data_delay,2t, according to the board ddr + * freqency and n_banks specified in board_specific_parameters table. + */ + ddr_freq = get_ddr_freq(0) / 1000000; + while (pbsp->datarate_mhz_high) { + if (pbsp->n_ranks == pdimm->n_ranks && + (pdimm->rank_density >> 30) >= pbsp->rank_gb) { + if (ddr_freq <= pbsp->datarate_mhz_high) { + popts->cpo_override = pbsp->cpo; + popts->write_data_delay = + pbsp->write_data_delay; + popts->clk_adjust = pbsp->clk_adjust; + popts->wrlvl_start = pbsp->wrlvl_start; + popts->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2; + popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3; + popts->twot_en = pbsp->force_2t; + goto found; + } + pbsp_highest = pbsp; + } + pbsp++; + } + + if (pbsp_highest) { + printf("Error: board specific timing not found\n"); + printf("for data rate %lu MT/s\n", ddr_freq); + printf("Trying to use the highest speed (%u) parameters\n", + pbsp_highest->datarate_mhz_high); + popts->cpo_override = pbsp_highest->cpo; + popts->write_data_delay = pbsp_highest->write_data_delay; + popts->clk_adjust = pbsp_highest->clk_adjust; + popts->wrlvl_start = pbsp_highest->wrlvl_start; + popts->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2; + popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3; + popts->twot_en = pbsp_highest->force_2t; + } else { + panic("DIMM is not supported by this board"); + } +found: + debug("Found timing match: n_ranks %d, data rate %d, rank_gb %d\n" + "\tclk_adjust %d, wrlvl_start %d, wrlvl_ctrl_2 0x%x, " + "wrlvl_ctrl_3 0x%x\n", + pbsp->n_ranks, pbsp->datarate_mhz_high, pbsp->rank_gb, + pbsp->clk_adjust, pbsp->wrlvl_start, pbsp->wrlvl_ctl_2, + pbsp->wrlvl_ctl_3); + + /* + * Factors to consider for half-strength driver enable: + * - number of DIMMs installed + */ + popts->half_strength_driver_enable = 0; + /* + * Write leveling override + */ + popts->wrlvl_override = 1; + popts->wrlvl_sample = 0xf; + + /* + * rtt and rtt_wr override + */ + popts->rtt_override = 0; + + /* Enable ZQ calibration */ + popts->zq_en = 1; + + /* DHC_EN =1, ODT = 75 Ohm */ + popts->ddr_cdr1 = DDR_CDR1_DHC_EN | DDR_CDR1_ODT(DDR_CDR_ODT_75ohm); + popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_75ohm); +} + +phys_size_t initdram(int board_type) +{ + phys_size_t dram_size; + + puts("Initializing....using SPD\n"); + + dram_size = fsl_ddr_sdram(); + + dram_size = setup_ddr_tlbs(dram_size / 0x100000); + dram_size *= 0x100000; + + puts(" DDR: "); + return dram_size; +} |