| Prabhakar Kushwaha | 7d43607 | 2013-09-12 11:11:28 +0530 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2013 Freescale Semiconductor, Inc. |
| 3 | * |
| 4 | * SPDX-License-Identifier: GPL-2.0+ |
| 5 | */ |
| 6 | |
| 7 | #include <common.h> |
| 8 | #include <i2c.h> |
| 9 | #include <hwconfig.h> |
| 10 | #include <asm/mmu.h> |
| 11 | #include <asm/fsl_ddr_sdram.h> |
| 12 | #include <asm/fsl_ddr_dimm_params.h> |
| 13 | #include <asm/fsl_law.h> |
| 14 | #include "ddr.h" |
| 15 | |
| 16 | DECLARE_GLOBAL_DATA_PTR; |
| 17 | |
| 18 | void fsl_ddr_board_options(memctl_options_t *popts, |
| 19 | dimm_params_t *pdimm, |
| 20 | unsigned int ctrl_num) |
| 21 | { |
| 22 | const struct board_specific_parameters *pbsp, *pbsp_highest = NULL; |
| 23 | ulong ddr_freq; |
| 24 | |
| 25 | if (ctrl_num > 2) { |
| 26 | printf("Not supported controller number %d\n", ctrl_num); |
| 27 | return; |
| 28 | } |
| 29 | if (!pdimm->n_ranks) |
| 30 | return; |
| 31 | |
| 32 | pbsp = udimms[0]; |
| 33 | |
| 34 | /* Get clk_adjust, cpo, write_data_delay,2t, according to the board ddr |
| 35 | * freqency and n_banks specified in board_specific_parameters table. |
| 36 | */ |
| 37 | ddr_freq = get_ddr_freq(0) / 1000000; |
| 38 | while (pbsp->datarate_mhz_high) { |
| 39 | if (pbsp->n_ranks == pdimm->n_ranks && |
| 40 | (pdimm->rank_density >> 30) >= pbsp->rank_gb) { |
| 41 | if (ddr_freq <= pbsp->datarate_mhz_high) { |
| 42 | popts->cpo_override = pbsp->cpo; |
| 43 | popts->write_data_delay = |
| 44 | pbsp->write_data_delay; |
| 45 | popts->clk_adjust = pbsp->clk_adjust; |
| 46 | popts->wrlvl_start = pbsp->wrlvl_start; |
| 47 | popts->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2; |
| 48 | popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3; |
| 49 | popts->twot_en = pbsp->force_2t; |
| 50 | goto found; |
| 51 | } |
| 52 | pbsp_highest = pbsp; |
| 53 | } |
| 54 | pbsp++; |
| 55 | } |
| 56 | |
| 57 | if (pbsp_highest) { |
| 58 | printf("Error: board specific timing not found\n"); |
| 59 | printf("for data rate %lu MT/s\n", ddr_freq); |
| 60 | printf("Trying to use the highest speed (%u) parameters\n", |
| 61 | pbsp_highest->datarate_mhz_high); |
| 62 | popts->cpo_override = pbsp_highest->cpo; |
| 63 | popts->write_data_delay = pbsp_highest->write_data_delay; |
| 64 | popts->clk_adjust = pbsp_highest->clk_adjust; |
| 65 | popts->wrlvl_start = pbsp_highest->wrlvl_start; |
| 66 | popts->wrlvl_ctl_2 = pbsp->wrlvl_ctl_2; |
| 67 | popts->wrlvl_ctl_3 = pbsp->wrlvl_ctl_3; |
| 68 | popts->twot_en = pbsp_highest->force_2t; |
| 69 | } else { |
| 70 | panic("DIMM is not supported by this board"); |
| 71 | } |
| 72 | found: |
| 73 | debug("Found timing match: n_ranks %d, data rate %d, rank_gb %d\n" |
| 74 | "\tclk_adjust %d, wrlvl_start %d, wrlvl_ctrl_2 0x%x, " |
| 75 | "wrlvl_ctrl_3 0x%x\n", |
| 76 | pbsp->n_ranks, pbsp->datarate_mhz_high, pbsp->rank_gb, |
| 77 | pbsp->clk_adjust, pbsp->wrlvl_start, pbsp->wrlvl_ctl_2, |
| 78 | pbsp->wrlvl_ctl_3); |
| 79 | |
| 80 | /* |
| 81 | * Factors to consider for half-strength driver enable: |
| 82 | * - number of DIMMs installed |
| 83 | */ |
| 84 | popts->half_strength_driver_enable = 0; |
| 85 | /* |
| 86 | * Write leveling override |
| 87 | */ |
| 88 | popts->wrlvl_override = 1; |
| 89 | popts->wrlvl_sample = 0xf; |
| 90 | |
| 91 | /* |
| 92 | * rtt and rtt_wr override |
| 93 | */ |
| 94 | popts->rtt_override = 0; |
| 95 | |
| 96 | /* Enable ZQ calibration */ |
| 97 | popts->zq_en = 1; |
| 98 | |
| 99 | /* DHC_EN =1, ODT = 75 Ohm */ |
| 100 | popts->ddr_cdr1 = DDR_CDR1_DHC_EN | DDR_CDR1_ODT(DDR_CDR_ODT_75ohm); |
| 101 | popts->ddr_cdr2 = DDR_CDR2_ODT(DDR_CDR_ODT_75ohm); |
| 102 | } |
| 103 | |
| 104 | phys_size_t initdram(int board_type) |
| 105 | { |
| 106 | phys_size_t dram_size; |
| 107 | |
| 108 | puts("Initializing....using SPD\n"); |
| 109 | |
| 110 | dram_size = fsl_ddr_sdram(); |
| 111 | |
| 112 | dram_size = setup_ddr_tlbs(dram_size / 0x100000); |
| 113 | dram_size *= 0x100000; |
| 114 | |
| 115 | puts(" DDR: "); |
| 116 | return dram_size; |
| 117 | } |