diff options
Diffstat (limited to 'board/freescale/p2041rdb/ddr.c')
| -rw-r--r-- | board/freescale/p2041rdb/ddr.c | 78 |
1 files changed, 50 insertions, 28 deletions
diff --git a/board/freescale/p2041rdb/ddr.c b/board/freescale/p2041rdb/ddr.c index 36370933b4..6d9a5de1c5 100644 --- a/board/freescale/p2041rdb/ddr.c +++ b/board/freescale/p2041rdb/ddr.c @@ -14,69 +14,91 @@ #include <asm/fsl_ddr_dimm_params.h> #include <asm/fsl_law.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; u32 wrlvl_start; u32 cpo; u32 write_data_delay; u32 force_2T; -} board_specific_parameters_t; +}; /* + * 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. + * * ranges for parameters: * wr_data_delay = 0-6 * clk adjust = 0-8 * cpo 2-0x1E (30) */ -const board_specific_parameters_t board_specific_parameters[] = { +static const struct board_specific_parameters dimm0[] = { /* * memory controller 0 - * lo| hi| num| clk| wrlvl | cpo |wrdata|2T - * mhz| mhz|ranks|adjst| start | delay| + * num| hi| clk| wrlvl | cpo |wrdata|2T + * ranks| mhz|adjst| start | delay| */ - { 0, 750, 2, 3, 5, 0xff, 2, 0}, - { 751, 1250, 2, 4, 6, 0xff, 2, 0}, - { 1251, 1350, 2, 5, 7, 0xff, 2, 0}, - { 1351, 1666, 2, 5, 8, 0xff, 2, 0}, + {2, 750, 3, 5, 0xff, 2, 0}, + {2, 1250, 4, 6, 0xff, 2, 0}, + {2, 1350, 5, 7, 0xff, 2, 0}, + {2, 1666, 5, 8, 0xff, 2, 0}, + {} }; void fsl_ddr_board_options(memctl_options_t *popts, dimm_params_t *pdimm, unsigned int ctrl_num) { - const board_specific_parameters_t *pbsp = - &board_specific_parameters[0]; - u32 num_params = ARRAY_SIZE(board_specific_parameters); - u32 i; + const struct board_specific_parameters *pbsp, *pbsp_highest = NULL; ulong ddr_freq; + if (ctrl_num) { + printf("Wrong parameter for controller number %d", ctrl_num); + return; + } + if (!pdimm->n_ranks) + return; + + 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 < num_params; i++) { - if (ddr_freq >= pbsp->datarate_mhz_low && - ddr_freq <= pbsp->datarate_mhz_high && - pdimm[0].n_ranks == pbsp->n_ranks) { - 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->twoT_en = pbsp->force_2T; - break; + while (pbsp->datarate_mhz_high) { + if (pbsp->n_ranks == pdimm->n_ranks) { + 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->twoT_en = pbsp->force_2T; + goto found; + } + pbsp_highest = pbsp; } pbsp++; } - if (i == num_params) { - printf("Warning: board specific timing not found " - "for data rate %lu MT/s!\n", ddr_freq); + 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->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->twoT_en = pbsp_highest->force_2T; + } else { + panic("DIMM is not supported by this board"); } +found: /* * Factors to consider for half-strength driver enable: * - number of DIMMs installed |
