diff options
Diffstat (limited to 'board/freescale/t102xrdb/ddr.c')
| -rw-r--r-- | board/freescale/t102xrdb/ddr.c | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/board/freescale/t102xrdb/ddr.c b/board/freescale/t102xrdb/ddr.c new file mode 100644 index 0000000..a20330b --- /dev/null +++ b/board/freescale/t102xrdb/ddr.c @@ -0,0 +1,154 @@ +/* + * Copyright 2014 Freescale Semiconductor, Inc. + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <i2c.h> +#include <hwconfig.h> +#include <asm/mmu.h> +#include <fsl_ddr_sdram.h> +#include <fsl_ddr_dimm_params.h> +#include <asm/fsl_law.h> + +DECLARE_GLOBAL_DATA_PTR; + +struct board_specific_parameters { + u32 n_ranks; + u32 datarate_mhz_high; + u32 rank_gb; + u32 clk_adjust; + u32 wrlvl_start; + u32 wrlvl_ctl_2; + u32 wrlvl_ctl_3; +}; + +/* + * datarate_mhz_high values need to be in ascending order + */ +static const struct board_specific_parameters udimm0[] = { + /* + * memory controller 0 + * num| hi| rank| clk| wrlvl | wrlvl | wrlvl | + * ranks| mhz| GB |adjst| start | ctl2 | ctl3 | + */ + {2, 833, 0, 4, 6, 0x06060607, 0x08080807,}, + {2, 1350, 0, 4, 7, 0x0708080A, 0x0A0B0C09,}, + {2, 1666, 0, 4, 7, 0x0808090B, 0x0C0D0E0A,}, + {1, 833, 0, 4, 6, 0x06060607, 0x08080807,}, + {1, 1350, 0, 4, 7, 0x0708080A, 0x0A0B0C09,}, + {1, 1666, 0, 4, 7, 0x0808090B, 0x0C0D0E0A,}, + {} +}; + +static const struct board_specific_parameters *udimms[] = { + udimm0, +}; + +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; + struct cpu_type *cpu = gd->arch.cpu; + + 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 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->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; + 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->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; + } else { + panic("DIMM is not supported by this board"); + } +found: + debug("Found timing match: n_ranks %d, data rate %d, rank_gb %d\n", + pbsp->n_ranks, pbsp->datarate_mhz_high, pbsp->rank_gb); + debug("\tclk_adjust %d, wrlvl_start %d, wrlvl_ctrl_2 0x%x, ", + pbsp->clk_adjust, pbsp->wrlvl_start, pbsp->wrlvl_ctl_2); + debug("wrlvl_ctrl_3 0x%x\n", 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_OFF); + popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_OFF); + + /* T1023 supports max DDR bus 32bit width, T1024 supports DDR 64bit, + * force DDR bus width to 32bit for T1023 + */ + if (cpu->soc_ver == SVR_T1023) + popts->data_bus_width = DDR_DATA_BUS_WIDTH_32; + +#ifdef CONFIG_FORCE_DDR_DATA_BUS_WIDTH_32 + /* for DDR bus 32bit test on T1024 */ + popts->data_bus_width = DDR_DATA_BUS_WIDTH_32; +#endif +} + +phys_size_t initdram(int board_type) +{ + phys_size_t dram_size; + +#if defined(CONFIG_SPL_BUILD) || !defined(CONFIG_RAMBOOT_PBL) + puts("Initializing....using SPD\n"); + + dram_size = fsl_ddr_sdram(); + dram_size = setup_ddr_tlbs(dram_size / 0x100000); + dram_size *= 0x100000; +#else + /* DDR has been initialised by first stage boot loader */ + dram_size = fsl_ddr_sdram_size(); +#endif + return dram_size; +} |