diff options
Diffstat (limited to 'board/freescale/mpc8349emds')
| -rw-r--r-- | board/freescale/mpc8349emds/ddr.c | 80 |
1 files changed, 45 insertions, 35 deletions
diff --git a/board/freescale/mpc8349emds/ddr.c b/board/freescale/mpc8349emds/ddr.c index 0209c1e..1d9d995 100644 --- a/board/freescale/mpc8349emds/ddr.c +++ b/board/freescale/mpc8349emds/ddr.c @@ -26,40 +26,42 @@ #include <asm/fsl_ddr_dimm_params.h> struct board_specific_parameters { - u32 datarate_mhz_low; - u32 datarate_mhz_high; u32 n_ranks; + u32 datarate_mhz_high; u32 clk_adjust; u32 cpo; u32 write_data_delay; u32 force_2T; }; -const struct board_specific_parameters board_specific_parameters_udimm[][20] = { - { +/* + * 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. + */ +static const struct board_specific_parameters udimm0[] = { /* - * memory controller 0 - * lo| hi| num| clk| cpo|wrdata|2T - * mhz| mhz|ranks|adjst| | delay| + * memory controller 0 + * num| hi| clk| cpo|wrdata|2T + * ranks| mhz|adjst| | delay| */ - { 0, 300, 2, 4, 4, 2, 0}, - {301, 365, 2, 4, 6, 2, 0}, - {366, 450, 2, 4, 7, 2, 0}, - {451, 850, 2, 4, 31, 2, 0}, - { 0, 300, 1, 4, 4, 2, 0}, - {301, 365, 1, 4, 6, 2, 0}, - {366, 450, 1, 4, 7, 2, 0}, - {451, 850, 1, 4, 31, 2, 0} - } + {2, 300, 4, 4, 2, 0}, + {2, 365, 4, 6, 2, 0}, + {2, 450, 4, 7, 2, 0}, + {2, 850, 4, 31, 2, 0}, + {1, 300, 4, 4, 2, 0}, + {1, 365, 4, 6, 2, 0}, + {1, 450, 4, 7, 2, 0}, + {1, 850, 4, 31, 2, 0}, + {} }; void fsl_ddr_board_options(memctl_options_t *popts, dimm_params_t *pdimm, unsigned int ctrl_num) { - const struct board_specific_parameters *pbsp; - u32 num_params; - u32 i, dimm_num; + const struct board_specific_parameters *pbsp, *pbsp_highest = NULL; + unsigned int i; ulong ddr_freq; if (ctrl_num != 0) /* we have only one controller */ @@ -71,33 +73,41 @@ void fsl_ddr_board_options(memctl_options_t *popts, if (i >= CONFIG_DIMM_SLOTS_PER_CTLR) /* no DIMM */ return; - dimm_num = i; - pbsp = &(board_specific_parameters_udimm[ctrl_num][0]); - num_params = sizeof(board_specific_parameters_udimm[ctrl_num]) / - sizeof(board_specific_parameters_udimm[0][0]); + pbsp = udimm0; /* 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[dimm_num].n_ranks == pbsp->n_ranks) { - 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; - break; + while (pbsp->datarate_mhz_high) { + if (pbsp->n_ranks == pdimm[i].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 (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->clk_adjust = pbsp_highest->clk_adjust; + popts->cpo_override = pbsp_highest->cpo; + popts->write_data_delay = pbsp_highest->write_data_delay; + 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 |