arch/powerpc/cpu/mpc85xx/ddr-gen2.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 <asm/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)
  19 {
  20         unsigned int i;
  21         volatile ccsr_ddr_t *ddr = (void *)CONFIG_SYS_MPC85xx_DDR_ADDR;
  22
  23         if (ctrl_num) {
  24                 printf("%s unexpected ctrl_num = %u\n", __FUNCTION__, ctrl_num);
  25                 return;
  26         }
  27
  28         for (i = 0; i < CONFIG_CHIP_SELECTS_PER_CTRL; i++) {
  29                 if (i == 0) {
  30                         out_be32(&ddr->cs0_bnds, regs->cs[i].bnds);
  31                         out_be32(&ddr->cs0_config, regs->cs[i].config);
  32
  33                 } else if (i == 1) {
  34                         out_be32(&ddr->cs1_bnds, regs->cs[i].bnds);
  35                         out_be32(&ddr->cs1_config, regs->cs[i].config);
  36
  37                 } else if (i == 2) {
  38                         out_be32(&ddr->cs2_bnds, regs->cs[i].bnds);
  39                         out_be32(&ddr->cs2_config, regs->cs[i].config);
  40
  41                 } else if (i == 3) {
  42                         out_be32(&ddr->cs3_bnds, regs->cs[i].bnds);
  43                         out_be32(&ddr->cs3_config, regs->cs[i].config);
  44                 }
  45         }
  46
  47         out_be32(&ddr->timing_cfg_3, regs->timing_cfg_3);
  48         out_be32(&ddr->timing_cfg_0, regs->timing_cfg_0);
  49         out_be32(&ddr->timing_cfg_1, regs->timing_cfg_1);
  50         out_be32(&ddr->timing_cfg_2, regs->timing_cfg_2);
  51         out_be32(&ddr->sdram_cfg_2, regs->ddr_sdram_cfg_2);
  52         out_be32(&ddr->sdram_mode, regs->ddr_sdram_mode);
  53         out_be32(&ddr->sdram_mode_2, regs->ddr_sdram_mode_2);
  54         out_be32(&ddr->sdram_md_cntl, regs->ddr_sdram_md_cntl);
  55         out_be32(&ddr->sdram_interval, regs->ddr_sdram_interval);
  56         out_be32(&ddr->sdram_data_init, regs->ddr_data_init);
  57         out_be32(&ddr->sdram_clk_cntl, regs->ddr_sdram_clk_cntl);
  58         out_be32(&ddr->init_addr, regs->ddr_init_addr);
  59         out_be32(&ddr->init_ext_addr, regs->ddr_init_ext_addr);
  60
  61         /*
  62          * 200 painful micro-seconds must elapse between
  63          * the DDR clock setup and the DDR config enable.
  64          */
  65         udelay(200);
  66         asm volatile("sync;isync");
  67
  68         out_be32(&ddr->sdram_cfg, regs->ddr_sdram_cfg);
  69
  70         /* Poll DDR_SDRAM_CFG_2[D_INIT] bit until auto-data init is done.  */
  71         while (in_be32(&ddr->sdram_cfg_2) & 0x10) {
  72                 udelay(10000);          /* throttle polling rate */
  73         }
  74 }