diff options
Diffstat (limited to 'board/freescale/t4qds/ddr.c')
| -rw-r--r-- | board/freescale/t4qds/ddr.c | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/board/freescale/t4qds/ddr.c b/board/freescale/t4qds/ddr.c new file mode 100644 index 0000000..692616a --- /dev/null +++ b/board/freescale/t4qds/ddr.c @@ -0,0 +1,186 @@ +/* + * Copyright 2012 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 or later as published by the Free Software Foundation. + */ + +#include <common.h> +#include <i2c.h> +#include <hwconfig.h> +#include <asm/mmu.h> +#include <asm/fsl_ddr_sdram.h> +#include <asm/fsl_ddr_dimm_params.h> +#include <asm/fsl_law.h> + +DECLARE_GLOBAL_DATA_PTR; + +struct board_specific_parameters { + u32 n_ranks; + u32 datarate_mhz_high; + u32 clk_adjust; + u32 wrlvl_start; + u32 wrlvl_ctl_2; + u32 wrlvl_ctl_3; + u32 cpo; + u32 write_data_delay; + u32 force_2T; +}; + +/* + * 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 + * num| hi| clk| wrlvl | wrlvl | wrlvl | cpo |wrdata|2T + * ranks| mhz|adjst| start | ctl2 | ctl3 | |delay | + */ + {2, 1350, 5, 7, 0x0809090b, 0x0c0c0d09, 0xff, 2, 0}, + {2, 1666, 5, 8, 0x080a0a0c, 0x0c0d0e0a, 0xff, 2, 0}, + {2, 2140, 5, 8, 0x090a0b0c, 0x0e0f100b, 0xff, 2, 0}, + {1, 1350, 5, 8, 0x0809090b, 0x0c0c0d0a, 0xff, 2, 0}, + {1, 1700, 5, 8, 0x080a0a0c, 0x0c0d0e0a, 0xff, 2, 0}, + {1, 1900, 4, 8, 0x080a0a0c, 0x0e0e0f0a, 0xff, 2, 0}, + {1, 2140, 4, 8, 0x090a0b0c, 0x0e0f100b, 0xff, 2, 0}, + {} +}; + +/* + * The three slots have slightly different timing. The center values are good + * for all slots. We use identical speed tables for them. In future use, if + * DIMMs require separated tables, make more entries as needed. + */ +static const struct board_specific_parameters *udimms[] = { + udimm0, +}; + +static const struct board_specific_parameters rdimm0[] = { + /* + * memory controller 0 + * num| hi| clk| wrlvl | wrlvl | wrlvl | cpo |wrdata|2T + * ranks| mhz|adjst| start | ctl2 | ctl3 | |delay | + */ + {4, 1350, 5, 9, 0x08070605, 0x07080805, 0xff, 2, 0}, + {4, 1666, 5, 8, 0x08070605, 0x07080805, 0xff, 2, 0}, + {4, 2140, 5, 8, 0x08070605, 0x07081805, 0xff, 2, 0}, + {2, 1350, 5, 7, 0x0809090b, 0x0c0c0d09, 0xff, 2, 0}, + {2, 1666, 5, 8, 0x080a0a0c, 0x0c0d0e0a, 0xff, 2, 0}, + {2, 2140, 5, 8, 0x090a0b0c, 0x0e0f100b, 0xff, 2, 0}, + {1, 1350, 5, 8, 0x0809090b, 0x0c0c0d0a, 0xff, 2, 0}, + {1, 1700, 5, 8, 0x080a0a0c, 0x0c0d0e0a, 0xff, 2, 0}, + {1, 1900, 4, 8, 0x080a0a0c, 0x0e0e0f0a, 0xff, 2, 0}, + {1, 2140, 4, 8, 0x090a0b0c, 0x0e0f100b, 0xff, 2, 0}, + {} +}; + +/* + * The three slots have slightly different timing. See comments above. + */ +static const struct board_specific_parameters *rdimms[] = { + rdimm0, +}; + +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; + ulong ddr_freq; + + if (ctrl_num > 2) { + printf("Not supported controller number %d\n", ctrl_num); + return; + } + if (!pdimm->n_ranks) + return; + + /* + * we use identical timing for all slots. If needed, change the code + * to pbsp = rdimms[ctrl_num] or pbsp = udimms[ctrl_num]; + */ + if (popts->registered_dimm_en) + pbsp = rdimms[0]; + else + pbsp = udimms[0]; + + + /* 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; + 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->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2; + popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3; + 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->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->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2; + popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3; + 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 + */ + popts->half_strength_driver_enable = 0; + /* + * Write leveling override + */ + popts->wrlvl_override = 1; + popts->wrlvl_sample = 0xf; + + /* + * Rtt and Rtt_WR override + */ + popts->rtt_override = 0; + + /* Enable ZQ calibration */ + popts->zq_en = 1; + + /* DHC_EN =1, ODT = 75 Ohm */ + popts->ddr_cdr1 = DDR_CDR1_DHC_EN | DDR_CDR1_ODT(DDR_CDR_ODT_75ohm); + popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_75ohm); +} + +phys_size_t initdram(int board_type) +{ + phys_size_t dram_size; + + puts("Initializing....using SPD\n"); + + dram_size = fsl_ddr_sdram(); + + dram_size = setup_ddr_tlbs(dram_size / 0x100000); + dram_size *= 0x100000; + + puts(" DDR: "); + return dram_size; +} |