board/sbc8548/ddr.c

   1 /*
   2  * Copyright 2008 Freescale Semiconductor, Inc.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * Version 2 as published by the Free Software Foundation.
   7  */
   8
   9 #include <common.h>
  10 #include <i2c.h>
  11
  12 #include <fsl_ddr_sdram.h>
  13 #include <fsl_ddr_dimm_params.h>
  14
  15 void fsl_ddr_board_options(memctl_options_t *popts,
  16                                 dimm_params_t *pdimm,
  17                                 unsigned int ctrl_num)
  18 {
  19         /*
  20          * Factors to consider for clock adjust:
  21          *      - number of chips on bus
  22          *      - position of slot
  23          *      - DDR1 vs. DDR2?
  24          *      - ???
  25          *
  26          * This needs to be determined on a board-by-board basis.
  27          *      0110    3/4 cycle late
  28          *      0111    7/8 cycle late
  29          */
  30         popts->clk_adjust = 7;
  31
  32         /*
  33          * Factors to consider for CPO:
  34          *      - frequency
  35          *      - ddr1 vs. ddr2
  36          */
  37         popts->cpo_override = 10;
  38
  39         /*
  40          * Factors to consider for write data delay:
  41          *      - number of DIMMs
  42          *
  43          * 1 = 1/4 clock delay
  44          * 2 = 1/2 clock delay
  45          * 3 = 3/4 clock delay
  46          * 4 = 1   clock delay
  47          * 5 = 5/4 clock delay
  48          * 6 = 3/2 clock delay
  49          */
  50         popts->write_data_delay = 3;
  51
  52         /*
  53          * Factors to consider for half-strength driver enable:
  54          *      - number of DIMMs installed
  55          */
  56         popts->half_strength_driver_enable = 0;
  57 }
  58
  59 #ifdef CONFIG_SPD_EEPROM
  60 /*
  61  * Workaround for hardware errata.  An i2c address conflict
  62  * existed on earlier boards; the workaround moved the DDR
  63  * SPD from 0x51 to 0x53.  So we try and read 0x53 1st, and
  64  * if that fails, then fall back to reading at 0x51.
  65  */
  66 void get_spd(generic_spd_eeprom_t *spd, u8 i2c_address)
  67 {
  68         int ret;
  69
  70 #ifdef ALT_SPD_EEPROM_ADDRESS
  71         if (i2c_address == SPD_EEPROM_ADDRESS) {
  72                 ret = i2c_read(ALT_SPD_EEPROM_ADDRESS, 0, 1, (uchar *)spd,
  73                                 sizeof(generic_spd_eeprom_t));
  74                 if (ret == 0)
  75                         return;         /* Good data at 0x53 */
  76                 memset(spd, 0, sizeof(generic_spd_eeprom_t));
  77         }
  78 #endif
  79         ret = i2c_read(i2c_address, 0, 1, (uchar *)spd,
  80                                 sizeof(generic_spd_eeprom_t));
  81         if (ret) {
  82                 printf("DDR: failed to read SPD from addr %u\n", i2c_address);
  83                 memset(spd, 0, sizeof(generic_spd_eeprom_t));
  84         }
  85 }
  86
  87 #else
  88 /*
  89  *  fixed_sdram init -- doesn't use serial presence detect.
  90  *  Assumes 256MB DDR2 SDRAM SODIMM, without ECC, running at DDR400 speed.
  91  */
  92 phys_size_t fixed_sdram(void)
  93 {
  94         volatile ccsr_ddr_t *ddr = (void *)(CONFIG_SYS_FSL_DDR_ADDR);
  95
  96         out_be32(&ddr->cs0_bnds,        0x0000007f);
  97         out_be32(&ddr->cs1_bnds,        0x008000ff);
  98         out_be32(&ddr->cs2_bnds,        0x00000000);
  99         out_be32(&ddr->cs3_bnds,        0x00000000);
 100
 101         out_be32(&ddr->cs0_config,      0x80010101);
 102         out_be32(&ddr->cs1_config,      0x80010101);
 103         out_be32(&ddr->cs2_config,      0x00000000);
 104         out_be32(&ddr->cs3_config,      0x00000000);
 105
 106         out_be32(&ddr->timing_cfg_3,    0x00000000);
 107         out_be32(&ddr->timing_cfg_0,    0x00220802);
 108         out_be32(&ddr->timing_cfg_1,    0x38377322);
 109         out_be32(&ddr->timing_cfg_2,    0x0fa044C7);
 110
 111         out_be32(&ddr->sdram_cfg,       0x4300C000);
 112         out_be32(&ddr->sdram_cfg_2,     0x24401000);
 113
 114         out_be32(&ddr->sdram_mode,      0x23C00542);
 115         out_be32(&ddr->sdram_mode_2,    0x00000000);
 116
 117         out_be32(&ddr->sdram_interval,  0x05080100);
 118         out_be32(&ddr->sdram_md_cntl,   0x00000000);
 119         out_be32(&ddr->sdram_data_init, 0x00000000);
 120         out_be32(&ddr->sdram_clk_cntl,  0x03800000);
 121         asm("sync;isync;msync");
 122         udelay(500);
 123
 124         #ifdef CONFIG_DDR_ECC
 125           /* Enable ECC checking */
 126           out_be32(&ddr->sdram_cfg, CONFIG_SYS_DDR_CONTROL | 0x20000000);
 127         #else
 128           out_be32(&ddr->sdram_cfg, CONFIG_SYS_DDR_CONTROL);
 129         #endif
 130
 131         return CONFIG_SYS_SDRAM_SIZE * 1024 * 1024;
 132 }
 133 #endif