diff options
Diffstat (limited to 'board/freescale/p1022ds/ddr.c')
| -rw-r--r-- | board/freescale/p1022ds/ddr.c | 79 |
1 files changed, 53 insertions, 26 deletions
diff --git a/board/freescale/p1022ds/ddr.c b/board/freescale/p1022ds/ddr.c index 20b996e..455e5e7 100644 --- a/board/freescale/p1022ds/ddr.c +++ b/board/freescale/p1022ds/ddr.c @@ -14,62 +14,89 @@ #include <asm/fsl_ddr_sdram.h> #include <asm/fsl_ddr_dimm_params.h> -typedef struct { - u32 datarate_mhz_low; - u32 datarate_mhz_high; +struct board_specific_parameters { u32 n_ranks; + u32 datarate_mhz_high; u32 clk_adjust; /* Range: 0-8 */ u32 cpo; /* Range: 2-31 */ u32 write_data_delay; /* Range: 0-6 */ u32 force_2T; -} board_specific_parameters_t; +}; -static const board_specific_parameters_t bsp[] = { /* - * lo| hi| num| clk| cpo|wrdata|2T - * mhz| mhz|ranks|adjst| | delay| + * This table contains all valid speeds we want to override with board + * specific parameters. datarate_mhz_high values need to be in ascending order + * for each n_ranks group. */ - { 0, 333, 1, 5, 31, 3, 0}, - {334, 400, 1, 5, 31, 3, 0}, - {401, 549, 1, 5, 31, 3, 0}, - {550, 680, 1, 5, 31, 5, 0}, - {681, 850, 1, 5, 31, 5, 0}, - { 0, 333, 2, 5, 31, 3, 0}, - {334, 400, 2, 5, 31, 3, 0}, - {401, 549, 2, 5, 31, 3, 0}, - {550, 680, 2, 5, 31, 5, 0}, - {681, 850, 2, 5, 31, 5, 0}, +static const struct board_specific_parameters dimm0[] = { + /* + * memory controller 0 + * num| hi| clk| cpo|wrdata|2T + * ranks| mhz|adjst| | delay| + */ + {1, 549, 5, 31, 3, 0}, + {1, 850, 5, 31, 5, 0}, + {2, 549, 5, 31, 3, 0}, + {2, 850, 5, 31, 5, 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; unsigned long ddr_freq; unsigned int i; + + if (ctrl_num) { + printf("Wrong parameter for controller number %d", ctrl_num); + return; + } + if (!pdimm->n_ranks) + return; + /* set odt_rd_cfg and odt_wr_cfg. */ for (i = 0; i < CONFIG_CHIP_SELECTS_PER_CTRL; i++) { popts->cs_local_opts[i].odt_rd_cfg = 0; popts->cs_local_opts[i].odt_wr_cfg = 1; } + pbsp = dimm0; /* * 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; - for (i = 0; i < ARRAY_SIZE(bsp); i++) { - if (ddr_freq >= bsp[i].datarate_mhz_low && - ddr_freq <= bsp[i].datarate_mhz_high && - pdimm->n_ranks == bsp[i].n_ranks) { - popts->clk_adjust = bsp[i].clk_adjust; - popts->cpo_override = bsp[i].cpo; - popts->write_data_delay = bsp[i].write_data_delay; - popts->twoT_en = bsp[i].force_2T; - break; + while (pbsp->datarate_mhz_high) { + if (pbsp->n_ranks == pdimm->n_ranks) { + if (ddr_freq <= pbsp->datarate_mhz_high) { + popts->clk_adjust = pbsp->clk_adjust; + popts->cpo_override = pbsp->cpo; + popts->write_data_delay = + pbsp->write_data_delay; + popts->twoT_en = pbsp->force_2T; + goto found; + } + pbsp_highest = pbsp; } + pbsp++; + } + + if (pbsp_highest) { + printf("Error: board specific timing not found " + "for data rate %lu MT/s!\n" + "Trying to use the highest speed (%u) parameters\n", + ddr_freq, pbsp_highest->datarate_mhz_high); + popts->clk_adjust = pbsp->clk_adjust; + popts->cpo_override = pbsp->cpo; + popts->write_data_delay = pbsp->write_data_delay; + popts->twoT_en = pbsp->force_2T; + } else { + panic("DIMM is not supported by this board"); } +found: popts->half_strength_driver_enable = 1; /* Per AN4039, enable ZQ calibration. */ |