drivers/ddr/fsl/mpc85xx_ddr_gen2.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright 2008-2011 Freescale Semiconductor, Inc.
   4  */
   5
   6 #include <common.h>
   7 #include <asm/io.h>
   8 #include <asm/processor.h>
   9 #include <fsl_ddr_sdram.h>
  10 #include <linux/delay.h>
  11
  12 #if (CONFIG_CHIP_SELECTS_PER_CTRL > 4)
  13 #error Invalid setting for CONFIG_CHIP_SELECTS_PER_CTRL
  14 #endif
  15
  16 void fsl_ddr_set_memctl_regs(const fsl_ddr_cfg_regs_t *regs,
  17                              unsigned int ctrl_num, int step)
  18 {
  19         unsigned int i;
  20         struct ccsr_ddr __iomem *ddr =
  21                 (struct ccsr_ddr __iomem *)CONFIG_SYS_FSL_DDR_ADDR;
  22
  23 #if defined(CONFIG_SYS_FSL_ERRATUM_NMG_DDR120) && defined(CONFIG_MPC85xx)
  24         ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
  25         uint svr;
  26 #endif
  27
  28         if (ctrl_num) {
  29                 printf("%s unexpected ctrl_num = %u\n", __FUNCTION__, ctrl_num);
  30                 return;
  31         }
  32
  33 #ifdef CONFIG_SYS_FSL_ERRATUM_NMG_DDR120
  34         /*
  35          * Set the DDR IO receiver to an acceptable bias point.
  36          * Fixed in Rev 2.1.
  37          */
  38         svr = get_svr();
  39         if ((SVR_MAJ(svr) == 1) || IS_SVR_REV(svr, 2, 0)) {
  40                 if ((regs->ddr_sdram_cfg & SDRAM_CFG_SDRAM_TYPE_MASK) ==
  41                    SDRAM_CFG_SDRAM_TYPE_DDR2)
  42                         out_be32(&gur->ddrioovcr, 0x90000000);
  43                 else
  44                         out_be32(&gur->ddrioovcr, 0xA8000000);
  45         }
  46 #endif
  47
  48         for (i = 0; i < CONFIG_CHIP_SELECTS_PER_CTRL; i++) {
  49                 if (i == 0) {
  50                         out_be32(&ddr->cs0_bnds, regs->cs[i].bnds);
  51                         out_be32(&ddr->cs0_config, regs->cs[i].config);
  52
  53                 } else if (i == 1) {
  54                         out_be32(&ddr->cs1_bnds, regs->cs[i].bnds);
  55                         out_be32(&ddr->cs1_config, regs->cs[i].config);
  56
  57                 } else if (i == 2) {
  58                         out_be32(&ddr->cs2_bnds, regs->cs[i].bnds);
  59                         out_be32(&ddr->cs2_config, regs->cs[i].config);
  60
  61                 } else if (i == 3) {
  62                         out_be32(&ddr->cs3_bnds, regs->cs[i].bnds);
  63                         out_be32(&ddr->cs3_config, regs->cs[i].config);
  64                 }
  65         }
  66
  67         out_be32(&ddr->timing_cfg_3, regs->timing_cfg_3);
  68         out_be32(&ddr->timing_cfg_0, regs->timing_cfg_0);
  69         out_be32(&ddr->timing_cfg_1, regs->timing_cfg_1);
  70         out_be32(&ddr->timing_cfg_2, regs->timing_cfg_2);
  71         out_be32(&ddr->sdram_cfg_2, regs->ddr_sdram_cfg_2);
  72         out_be32(&ddr->sdram_mode, regs->ddr_sdram_mode);
  73         out_be32(&ddr->sdram_mode_2, regs->ddr_sdram_mode_2);
  74         out_be32(&ddr->sdram_md_cntl, regs->ddr_sdram_md_cntl);
  75         out_be32(&ddr->sdram_interval, regs->ddr_sdram_interval);
  76         out_be32(&ddr->sdram_data_init, regs->ddr_data_init);
  77         out_be32(&ddr->sdram_clk_cntl, regs->ddr_sdram_clk_cntl);
  78         out_be32(&ddr->init_addr, regs->ddr_init_addr);
  79         out_be32(&ddr->init_ext_addr, regs->ddr_init_ext_addr);
  80
  81         /*
  82          * 200 painful micro-seconds must elapse between
  83          * the DDR clock setup and the DDR config enable.
  84          */
  85         udelay(200);
  86         asm volatile("sync;isync");
  87
  88         out_be32(&ddr->sdram_cfg, regs->ddr_sdram_cfg);
  89
  90         /* Poll DDR_SDRAM_CFG_2[D_INIT] bit until auto-data init is done.  */
  91         while (in_be32(&ddr->sdram_cfg_2) & 0x10) {
  92                 udelay(10000);          /* throttle polling rate */
  93         }
  94 }