diff options
Diffstat (limited to 'board/varisys/cyrus/ddr.c')
| -rw-r--r-- | board/varisys/cyrus/ddr.c | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/board/varisys/cyrus/ddr.c b/board/varisys/cyrus/ddr.c new file mode 100644 index 0000000000..bb1d29a94c --- /dev/null +++ b/board/varisys/cyrus/ddr.c @@ -0,0 +1,188 @@ +/* + * Based on corenet_ds ddr code + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <i2c.h> +#include <hwconfig.h> +#include <asm/mmu.h> +#include <fsl_ddr_sdram.h> +#include <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 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 | cpo |wrdata|2T + * ranks| mhz|adjst| start | |delay | + */ + {4, 850, 4, 6, 0xff, 2, 0}, + {4, 950, 5, 7, 0xff, 2, 0}, + {4, 1050, 5, 8, 0xff, 2, 0}, + {4, 1250, 5, 10, 0xff, 2, 0}, + {4, 1350, 5, 11, 0xff, 2, 0}, + {4, 1666, 5, 12, 0xff, 2, 0}, + {2, 850, 5, 6, 0xff, 2, 0}, + {2, 1050, 5, 7, 0xff, 2, 0}, + {2, 1250, 4, 6, 0xff, 2, 0}, + {2, 1350, 5, 7, 0xff, 2, 0}, + {2, 1666, 5, 8, 0xff, 2, 0}, + {1, 1250, 4, 6, 0xff, 2, 0}, + {1, 1335, 4, 7, 0xff, 2, 0}, + {1, 1666, 4, 8, 0xff, 2, 0}, + {} +}; + +/* + * The two slots have slightly different timing. The center values are good + * for both slots. We use identical speed tables for them. In future use, if + * DIMMs have fewer center values that require two separated tables, copy the + * udimm0 table to udimm1 and make changes to clk_adjust and wrlvl_start. + */ +static const struct board_specific_parameters *udimms[] = { + udimm0, + udimm0, +}; + +static const struct board_specific_parameters rdimm0[] = { + /* + * memory controller 0 + * num| hi| clk| wrlvl | cpo |wrdata|2T + * ranks| mhz|adjst| start | |delay | + */ + {4, 850, 4, 6, 0xff, 2, 0}, + {4, 950, 5, 7, 0xff, 2, 0}, + {4, 1050, 5, 8, 0xff, 2, 0}, + {4, 1250, 5, 10, 0xff, 2, 0}, + {4, 1350, 5, 11, 0xff, 2, 0}, + {4, 1666, 5, 12, 0xff, 2, 0}, + {2, 850, 4, 6, 0xff, 2, 0}, + {2, 1050, 4, 7, 0xff, 2, 0}, + {2, 1666, 4, 8, 0xff, 2, 0}, + {1, 850, 4, 5, 0xff, 2, 0}, + {1, 950, 4, 7, 0xff, 2, 0}, + {1, 1666, 4, 8, 0xff, 2, 0}, + {} +}; + +/* + * The two slots have slightly different timing. See comments above. + */ +static const struct board_specific_parameters *rdimms[] = { + rdimm0, + 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 > 1) { + printf("Wrong parameter for controller number %d", ctrl_num); + return; + } + if (!pdimm->n_ranks) + return; + + if (popts->registered_dimm_en) + pbsp = rdimms[ctrl_num]; + else + pbsp = udimms[ctrl_num]; + + + /* 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->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!\nTrying 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 + */ + 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 = 60 Ohm */ + popts->ddr_cdr1 = DDR_CDR1_DHC_EN; +} + +phys_size_t initdram(int board_type) +{ + phys_size_t dram_size; + + puts("Initializing...."); + + if (!fsl_use_spd()) + panic("Cyrus only supports using SPD for DRAM\n"); + + puts("using SPD\n"); + dram_size = fsl_ddr_sdram(); + + dram_size = setup_ddr_tlbs(dram_size / 0x100000); + dram_size *= 0x100000; + + debug(" DDR: "); + return dram_size; +} |
