drivers/ddr/fsl/mpc86xx_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 <asm/io.h>
  11 #include <fsl_ddr_sdram.h>
  12
  13 #if (CONFIG_CHIP_SELECTS_PER_CTRL > 4)
  14 #error Invalid setting for CONFIG_CHIP_SELECTS_PER_CTRL
  15 #endif
  16
  17 void fsl_ddr_set_memctl_regs(const fsl_ddr_cfg_regs_t *regs,
  18                              unsigned int ctrl_num, int step)
  19 {
  20         unsigned int i;
  21         struct ccsr_ddr __iomem *ddr;
  22
  23         switch (ctrl_num) {
  24         case 0:
  25                 ddr = (void *)CONFIG_SYS_FSL_DDR_ADDR;
  26                 break;
  27         case 1:
  28                 ddr = (void *)CONFIG_SYS_FSL_DDR2_ADDR;
  29                 break;
  30         default:
  31                 printf("%s unexpected ctrl_num = %u\n", __FUNCTION__, ctrl_num);
  32                 return;
  33         }
  34
  35         for (i = 0; i < CONFIG_CHIP_SELECTS_PER_CTRL; i++) {
  36                 if (i == 0) {
  37                         out_be32(&ddr->cs0_bnds, regs->cs[i].bnds);
  38                         out_be32(&ddr->cs0_config, regs->cs[i].config);
  39
  40                 } else if (i == 1) {
  41                         out_be32(&ddr->cs1_bnds, regs->cs[i].bnds);
  42                         out_be32(&ddr->cs1_config, regs->cs[i].config);
  43
  44                 } else if (i == 2) {
  45                         out_be32(&ddr->cs2_bnds, regs->cs[i].bnds);
  46                         out_be32(&ddr->cs2_config, regs->cs[i].config);
  47
  48                 } else if (i == 3) {
  49                         out_be32(&ddr->cs3_bnds, regs->cs[i].bnds);
  50                         out_be32(&ddr->cs3_config, regs->cs[i].config);
  51                 }
  52         }
  53
  54         out_be32(&ddr->timing_cfg_3, regs->timing_cfg_3);
  55         out_be32(&ddr->timing_cfg_0, regs->timing_cfg_0);
  56         out_be32(&ddr->timing_cfg_1, regs->timing_cfg_1);
  57         out_be32(&ddr->timing_cfg_2, regs->timing_cfg_2);
  58         out_be32(&ddr->sdram_cfg_2, regs->ddr_sdram_cfg_2);
  59         out_be32(&ddr->sdram_mode, regs->ddr_sdram_mode);
  60         out_be32(&ddr->sdram_mode_2, regs->ddr_sdram_mode_2);
  61         out_be32(&ddr->sdram_md_cntl, regs->ddr_sdram_md_cntl);
  62         out_be32(&ddr->sdram_interval, regs->ddr_sdram_interval);
  63         out_be32(&ddr->sdram_data_init, regs->ddr_data_init);
  64         out_be32(&ddr->sdram_clk_cntl, regs->ddr_sdram_clk_cntl);
  65         out_be32(&ddr->init_addr, regs->ddr_init_addr);
  66         out_be32(&ddr->init_ext_addr, regs->ddr_init_ext_addr);
  67
  68         debug("before go\n");
  69
  70         /*
  71          * 200 painful micro-seconds must elapse between
  72          * the DDR clock setup and the DDR config enable.
  73          */
  74         udelay(200);
  75         asm volatile("sync;isync");
  76
  77         out_be32(&ddr->sdram_cfg, regs->ddr_sdram_cfg);
  78
  79         /*
  80          * Poll DDR_SDRAM_CFG_2[D_INIT] bit until auto-data init is done
  81          */
  82         while (in_be32(&ddr->sdram_cfg_2) & 0x10) {
  83                 udelay(10000);          /* throttle polling rate */
  84         }
  85 }