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Diffstat (limited to 'board/freescale/p2020ds/ddr.c')
| -rw-r--r-- | board/freescale/p2020ds/ddr.c | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/board/freescale/p2020ds/ddr.c b/board/freescale/p2020ds/ddr.c new file mode 100644 index 0000000..b9c0cb2 --- /dev/null +++ b/board/freescale/p2020ds/ddr.c @@ -0,0 +1,130 @@ +/* + * Copyright 2008-2009 Freescale Semiconductor, Inc. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * Version 2 as published by the Free Software Foundation. + */ + +#include <common.h> +#include <i2c.h> + +#include <asm/fsl_ddr_sdram.h> +#include <asm/fsl_ddr_dimm_params.h> + +static void get_spd(ddr3_spd_eeprom_t *spd, unsigned char i2c_address) +{ + i2c_read(i2c_address, 0, 1, (uchar *)spd, sizeof(ddr3_spd_eeprom_t)); +} + +unsigned int fsl_ddr_get_mem_data_rate(void) +{ + return get_ddr_freq(0); +} + +void fsl_ddr_get_spd(ddr3_spd_eeprom_t *ctrl_dimms_spd, + unsigned int ctrl_num) +{ + unsigned int i; + unsigned int i2c_address = 0; + + for (i = 0; i < CONFIG_DIMM_SLOTS_PER_CTLR; i++) { + if (ctrl_num == 0 && i == 0) + i2c_address = SPD_EEPROM_ADDRESS1; + get_spd(&(ctrl_dimms_spd[i]), i2c_address); + } +} + +typedef struct { + u32 datarate_mhz_low; + u32 datarate_mhz_high; + u32 n_ranks; + u32 clk_adjust; + u32 cpo; + u32 write_data_delay; + u32 force_2T; +} board_specific_parameters_t; + +/* ranges for parameters: + * wr_data_delay = 0-6 + * clk adjust = 0-8 + * cpo 2-0x1E (30) + */ + + +/* XXX: these values need to be checked for all interleaving modes. */ +/* XXX: No reliable dual-rank 800 MHz setting has been found. It may + * seem reliable, but errors will appear when memory intensive + * program is run. */ +/* XXX: Single rank at 800 MHz is OK. */ +const board_specific_parameters_t board_specific_parameters[][20] = { + { + /* memory controller 0 */ + /* lo| hi| num| clk| cpo|wrdata|2T */ + /* mhz| mhz|ranks|adjst| | delay| */ + { 0, 333, 2, 6, 7, 3, 0}, + {334, 400, 2, 6, 9, 3, 0}, + {401, 549, 2, 6, 11, 3, 0}, + {550, 680, 2, 1, 10, 5, 0}, + {681, 850, 2, 1, 12, 5, 1}, + { 0, 333, 1, 6, 7, 3, 0}, + {334, 400, 1, 6, 9, 3, 0}, + {401, 549, 1, 6, 11, 3, 0}, + {550, 680, 1, 1, 10, 5, 0}, + {681, 850, 1, 1, 12, 5, 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[ctrl_num][0]); + u32 num_params = sizeof(board_specific_parameters[ctrl_num]) / + sizeof(board_specific_parameters[0][0]); + u32 i; + ulong ddr_freq; + + /* 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. + */ + 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 == 1) { + popts->cs_local_opts[i].odt_rd_cfg = 0; + popts->cs_local_opts[i].odt_wr_cfg = 4; + } else if (CONFIG_DIMM_SLOTS_PER_CTLR == 2) { + popts->cs_local_opts[i].odt_rd_cfg = 3; + popts->cs_local_opts[i].odt_wr_cfg = 3; + } + } + } + + /* 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->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; + } + pbsp++; + } + + /* + * Factors to consider for half-strength driver enable: + * - number of DIMMs installed + */ + popts->half_strength_driver_enable = 0; +} |