drivers/ddr/fsl/mpc86xx_ddr.c

   1 /*
   2  * Copyright 2008 Freescale Semiconductor, Inc.
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0
   5  */
   6
   7 #include <common.h>
   8 #include <asm/io.h>
   9 #include <fsl_ddr_sdram.h>
  10
  11 #if (CONFIG_CHIP_SELECTS_PER_CTRL > 4)
  12 #error Invalid setting for CONFIG_CHIP_SELECTS_PER_CTRL
  13 #endif
  14
  15 void fsl_ddr_set_memctl_regs(const fsl_ddr_cfg_regs_t *regs,
  16                              unsigned int ctrl_num, int step)
  17 {
  18         unsigned int i;
  19         struct ccsr_ddr __iomem *ddr;
  20
  21         switch (ctrl_num) {
  22         case 0:
  23                 ddr = (void *)CONFIG_SYS_FSL_DDR_ADDR;
  24                 break;
  25         case 1:
  26                 ddr = (void *)CONFIG_SYS_FSL_DDR2_ADDR;
  27                 break;
  28         default:
  29                 printf("%s unexpected ctrl_num = %u\n", __FUNCTION__, ctrl_num);
  30                 return;
  31         }
  32
  33         for (i = 0; i < CONFIG_CHIP_SELECTS_PER_CTRL; i++) {
  34                 if (i == 0) {
  35                         out_be32(&ddr->cs0_bnds, regs->cs[i].bnds);
  36                         out_be32(&ddr->cs0_config, regs->cs[i].config);
  37
  38                 } else if (i == 1) {
  39                         out_be32(&ddr->cs1_bnds, regs->cs[i].bnds);
  40                         out_be32(&ddr->cs1_config, regs->cs[i].config);
  41
  42                 } else if (i == 2) {
  43                         out_be32(&ddr->cs2_bnds, regs->cs[i].bnds);
  44                         out_be32(&ddr->cs2_config, regs->cs[i].config);
  45
  46                 } else if (i == 3) {
  47                         out_be32(&ddr->cs3_bnds, regs->cs[i].bnds);
  48                         out_be32(&ddr->cs3_config, regs->cs[i].config);
  49                 }
  50         }
  51
  52         out_be32(&ddr->timing_cfg_3, regs->timing_cfg_3);
  53         out_be32(&ddr->timing_cfg_0, regs->timing_cfg_0);
  54         out_be32(&ddr->timing_cfg_1, regs->timing_cfg_1);
  55         out_be32(&ddr->timing_cfg_2, regs->timing_cfg_2);
  56         out_be32(&ddr->sdram_cfg_2, regs->ddr_sdram_cfg_2);
  57         out_be32(&ddr->sdram_mode, regs->ddr_sdram_mode);
  58         out_be32(&ddr->sdram_mode_2, regs->ddr_sdram_mode_2);
  59         out_be32(&ddr->sdram_md_cntl, regs->ddr_sdram_md_cntl);
  60         out_be32(&ddr->sdram_interval, regs->ddr_sdram_interval);
  61         out_be32(&ddr->sdram_data_init, regs->ddr_data_init);
  62         out_be32(&ddr->sdram_clk_cntl, regs->ddr_sdram_clk_cntl);
  63         out_be32(&ddr->init_addr, regs->ddr_init_addr);
  64         out_be32(&ddr->init_ext_addr, regs->ddr_init_ext_addr);
  65
  66         debug("before go\n");
  67
  68         /*
  69          * 200 painful micro-seconds must elapse between
  70          * the DDR clock setup and the DDR config enable.
  71          */
  72         udelay(200);
  73         asm volatile("sync;isync");
  74
  75         out_be32(&ddr->sdram_cfg, regs->ddr_sdram_cfg);
  76
  77         /*
  78          * Poll DDR_SDRAM_CFG_2[D_INIT] bit until auto-data init is done
  79          */
  80         while (in_be32(&ddr->sdram_cfg_2) & 0x10) {
  81                 udelay(10000);          /* throttle polling rate */
  82         }
  83 }