arch/arm/cpu/armv7/am33xx/emif4.c

   1 /*
   2  * emif4.c
   3  *
   4  * AM33XX emif4 configuration file
   5  *
   6  * Copyright (C) 2011, Texas Instruments, Incorporated - http://www.ti.com/
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR /PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  */
  18
  19 #include <common.h>
  20 #include <asm/arch/cpu.h>
  21 #include <asm/arch/ddr_defs.h>
  22 #include <asm/arch/hardware.h>
  23 #include <asm/arch/clock.h>
  24 #include <asm/arch/sys_proto.h>
  25 #include <asm/io.h>
  26 #include <asm/emif.h>
  27
  28 DECLARE_GLOBAL_DATA_PTR;
  29
  30 int dram_init(void)
  31 {
  32         /* dram_init must store complete ramsize in gd->ram_size */
  33         gd->ram_size = get_ram_size(
  34                         (void *)CONFIG_SYS_SDRAM_BASE,
  35                         CONFIG_MAX_RAM_BANK_SIZE);
  36         return 0;
  37 }
  38
  39 void dram_init_banksize(void)
  40 {
  41         gd->bd->bi_dram[0].start = CONFIG_SYS_SDRAM_BASE;
  42         gd->bd->bi_dram[0].size = gd->ram_size;
  43 }
  44
  45
  46 #ifdef CONFIG_SPL_BUILD
  47 static struct vtp_reg *vtpreg = (struct vtp_reg *)VTP0_CTRL_ADDR;
  48 static struct ddr_ctrl *ddrctrl = (struct ddr_ctrl *)DDR_CTRL_ADDR;
  49
  50 static const struct ddr_data ddr2_data = {
  51         .datardsratio0 = ((DDR2_RD_DQS<<30)|(DDR2_RD_DQS<<20)
  52                                 |(DDR2_RD_DQS<<10)|(DDR2_RD_DQS<<0)),
  53         .datawdsratio0 = ((DDR2_WR_DQS<<30)|(DDR2_WR_DQS<<20)
  54                                 |(DDR2_WR_DQS<<10)|(DDR2_WR_DQS<<0)),
  55         .datawiratio0 = ((DDR2_PHY_WRLVL<<30)|(DDR2_PHY_WRLVL<<20)
  56                                 |(DDR2_PHY_WRLVL<<10)|(DDR2_PHY_WRLVL<<0)),
  57         .datagiratio0 = ((DDR2_PHY_GATELVL<<30)|(DDR2_PHY_GATELVL<<20)
  58                                 |(DDR2_PHY_GATELVL<<10)|(DDR2_PHY_GATELVL<<0)),
  59         .datafwsratio0 = ((DDR2_PHY_FIFO_WE<<30)|(DDR2_PHY_FIFO_WE<<20)
  60                                 |(DDR2_PHY_FIFO_WE<<10)|(DDR2_PHY_FIFO_WE<<0)),
  61         .datawrsratio0 = ((DDR2_PHY_WR_DATA<<30)|(DDR2_PHY_WR_DATA<<20)
  62                                 |(DDR2_PHY_WR_DATA<<10)|(DDR2_PHY_WR_DATA<<0)),
  63         .datauserank0delay = DDR2_PHY_RANK0_DELAY,
  64         .datadldiff0 = PHY_DLL_LOCK_DIFF,
  65 };
  66
  67 static const struct cmd_control ddr2_cmd_ctrl_data = {
  68         .cmd0csratio = DDR2_RATIO,
  69         .cmd0dldiff = DDR2_DLL_LOCK_DIFF,
  70         .cmd0iclkout = DDR2_INVERT_CLKOUT,
  71
  72         .cmd1csratio = DDR2_RATIO,
  73         .cmd1dldiff = DDR2_DLL_LOCK_DIFF,
  74         .cmd1iclkout = DDR2_INVERT_CLKOUT,
  75
  76         .cmd2csratio = DDR2_RATIO,
  77         .cmd2dldiff = DDR2_DLL_LOCK_DIFF,
  78         .cmd2iclkout = DDR2_INVERT_CLKOUT,
  79 };
  80
  81 static const struct emif_regs ddr2_emif_reg_data = {
  82         .sdram_config = DDR2_EMIF_SDCFG,
  83         .ref_ctrl = DDR2_EMIF_SDREF,
  84         .sdram_tim1 = DDR2_EMIF_TIM1,
  85         .sdram_tim2 = DDR2_EMIF_TIM2,
  86         .sdram_tim3 = DDR2_EMIF_TIM3,
  87         .emif_ddr_phy_ctlr_1 = DDR2_EMIF_READ_LATENCY,
  88 };
  89
  90 static void config_vtp(void)
  91 {
  92         writel(readl(&vtpreg->vtp0ctrlreg) | VTP_CTRL_ENABLE,
  93                         &vtpreg->vtp0ctrlreg);
  94         writel(readl(&vtpreg->vtp0ctrlreg) & (~VTP_CTRL_START_EN),
  95                         &vtpreg->vtp0ctrlreg);
  96         writel(readl(&vtpreg->vtp0ctrlreg) | VTP_CTRL_START_EN,
  97                         &vtpreg->vtp0ctrlreg);
  98
  99         /* Poll for READY */
 100         while ((readl(&vtpreg->vtp0ctrlreg) & VTP_CTRL_READY) !=
 101                         VTP_CTRL_READY)
 102                 ;
 103 }
 104
 105 void config_ddr(short ddr_type)
 106 {
 107         enable_emif_clocks();
 108
 109         if (ddr_type == EMIF_REG_SDRAM_TYPE_DDR2) {
 110                 ddr_pll_config(266);
 111                 config_vtp();
 112
 113                 config_cmd_ctrl(&ddr2_cmd_ctrl_data);
 114
 115                 config_ddr_data(0, &ddr2_data);
 116                 config_ddr_data(1, &ddr2_data);
 117
 118                 config_io_ctrl(DDR2_IOCTRL_VALUE);
 119
 120                 /* Set CKE to be controlled by EMIF/DDR PHY */
 121                 writel(DDR_CKE_CTRL_NORMAL, &ddrctrl->ddrckectrl);
 122
 123                 /* Program EMIF instance */
 124                 config_ddr_phy(&ddr2_emif_reg_data);
 125                 set_sdram_timings(&ddr2_emif_reg_data);
 126                 config_sdram(&ddr2_emif_reg_data);
 127         }
 128 }
 129 #endif