diff options
Diffstat (limited to 'board/freescale/mpc8641hpcn/ddr.c')
| -rw-r--r-- | board/freescale/mpc8641hpcn/ddr.c | 146 |
1 files changed, 110 insertions, 36 deletions
diff --git a/board/freescale/mpc8641hpcn/ddr.c b/board/freescale/mpc8641hpcn/ddr.c index 23497f9..517c6ee 100644 --- a/board/freescale/mpc8641hpcn/ddr.c +++ b/board/freescale/mpc8641hpcn/ddr.c @@ -46,46 +46,120 @@ void fsl_ddr_get_spd(ddr2_spd_eeprom_t *ctrl_dimms_spd, } } +typedef struct { + u32 datarate_mhz_low; + u32 datarate_mhz_high; + u32 n_ranks; + u32 clk_adjust; + u32 cpo; + u32 write_data_delay; +} board_specific_parameters_t; + +/* XXX: these values need to be checked for all interleaving modes. */ +const board_specific_parameters_t board_specific_parameters[2][16] = { + { + /* memory controller 0 */ + /* lo| hi| num| clk| cpo|wrdata */ + /* mhz| mhz|ranks|adjst| | delay */ + { 0, 333, 4, 7, 7, 3}, + {334, 400, 4, 7, 9, 3}, + {401, 549, 4, 7, 9, 3}, + {550, 650, 4, 7, 10, 4}, + + { 0, 333, 3, 7, 7, 3}, + {334, 400, 3, 7, 9, 3}, + {401, 549, 3, 7, 9, 3}, + {550, 650, 3, 7, 10, 4}, + + { 0, 333, 2, 7, 7, 3}, + {334, 400, 2, 7, 9, 3}, + {401, 549, 2, 7, 9, 3}, + {550, 650, 2, 7, 10, 4}, + + { 0, 333, 1, 7, 7, 3}, + {334, 400, 1, 7, 9, 3}, + {401, 549, 1, 7, 9, 3}, + {550, 650, 1, 7, 10, 4} + }, + + { + /* memory controller 1 */ + /* lo| hi| num| clk| cpo|wrdata */ + /* mhz| mhz|ranks|adjst| | delay */ + { 0, 333, 4, 7, 7, 3}, + {334, 400, 4, 7, 9, 3}, + {401, 549, 4, 7, 9, 3}, + {550, 650, 4, 7, 10, 4}, + + { 0, 333, 3, 7, 7, 3}, + {334, 400, 3, 7, 9, 3}, + {401, 549, 3, 7, 9, 3}, + {550, 650, 3, 7, 10, 4}, + + { 0, 333, 2, 7, 7, 3}, + {334, 400, 2, 7, 9, 3}, + {401, 549, 2, 7, 9, 3}, + {550, 650, 2, 7, 10, 4}, + + { 0, 333, 1, 7, 7, 3}, + {334, 400, 1, 7, 9, 3}, + {401, 549, 1, 7, 9, 3}, + {550, 650, 1, 7, 10, 4} + } +}; + void fsl_ddr_board_options(memctl_options_t *popts, - dimm_params_t *pdimm, - unsigned int ctrl_num) + dimm_params_t *pdimm, + unsigned int ctrl_num) { - /* - * Factors to consider for clock adjust: - * - number of chips on bus - * - position of slot - * - DDR1 vs. DDR2? - * - ??? - * - * This needs to be determined on a board-by-board basis. - * 0110 3/4 cycle late - * 0111 7/8 cycle late - */ - popts->clk_adjust = 7; + const board_specific_parameters_t *pbsp = + &(board_specific_parameters[ctrl_num][0]); + u32 num_params = sizeof(board_specific_parameters[ctrl_num]) / + sizeof(board_specific_parameters[0][0]); + u32 i; + u32 j; + ulong ddr_freq; - /* - * Factors to consider for CPO: - * - frequency - * - ddr1 vs. ddr2 + /* set odt_rd_cfg and odt_wr_cfg. If the there is only one dimm in + * that controller, set odt_wr_cfg to 4 for CS0, and 0 to CS1. If + * there are two dimms in the controller, set odt_rd_cfg to 3 and + * odt_wr_cfg to 3 for the even CS, 0 for the odd CS. */ - popts->cpo_override = 10; - - /* - * Factors to consider for write data delay: - * - number of DIMMs - * - * 1 = 1/4 clock delay - * 2 = 1/2 clock delay - * 3 = 3/4 clock delay - * 4 = 1 clock delay - * 5 = 5/4 clock delay - * 6 = 3/2 clock delay - */ - popts->write_data_delay = 3; + for (i = 0; i < CONFIG_CHIP_SELECTS_PER_CTRL; i++) { + if (i&1) { /* odd CS */ + popts->cs_local_opts[i].odt_rd_cfg = 0; + popts->cs_local_opts[i].odt_wr_cfg = 0; + } else { /* even CS */ + if ((CONFIG_DIMM_SLOTS_PER_CTLR == 2) && + (pdimm[i/2].n_ranks != 0)) { + popts->cs_local_opts[i].odt_rd_cfg = 3; + popts->cs_local_opts[i].odt_wr_cfg = 3; + } else { + popts->cs_local_opts[i].odt_rd_cfg = 0; + popts->cs_local_opts[i].odt_wr_cfg = 4; + } + } + } - /* - * Factors to consider for half-strength driver enable: - * - number of DIMMs installed + /* Get clk_adjust, cpo, write_data_delay, according to the board ddr + * freqency and n_banks specified in board_specific_parameters table. */ - popts->half_strength_driver_enable = 0; + ddr_freq = fsl_ddr_get_mem_data_rate() / 1000000; + for (j = 0; j < CONFIG_DIMM_SLOTS_PER_CTLR; j++) { + if (pdimm[j].n_ranks > 0) { + for (i = 0; i < num_params; i++) { + if (ddr_freq >= pbsp->datarate_mhz_low && + ddr_freq <= pbsp->datarate_mhz_high && + pdimm[j].n_ranks == pbsp->n_ranks) { + popts->clk_adjust = pbsp->clk_adjust; + popts->cpo_override = pbsp->cpo; + popts->write_data_delay = + pbsp->write_data_delay; + break; + } + pbsp++; + } + } + } + } |