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

   1 /*
   2  * DDR Configuration for AM33xx devices.
   3  *
   4  * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
   5  *
   6  * SPDX-License-Identifier:     GPL-2.0+
   7  */
   8
   9 #include <asm/arch/cpu.h>
  10 #include <asm/arch/ddr_defs.h>
  11 #include <asm/arch/sys_proto.h>
  12 #include <asm/io.h>
  13 #include <asm/emif.h>
  14
  15 /**
  16  * Base address for EMIF instances
  17  */
  18 static struct emif_reg_struct *emif_reg[2] = {
  19                                 (struct emif_reg_struct *)EMIF4_0_CFG_BASE,
  20                                 (struct emif_reg_struct *)EMIF4_1_CFG_BASE};
  21
  22 /**
  23  * Base addresses for DDR PHY cmd/data regs
  24  */
  25 static struct ddr_cmd_regs *ddr_cmd_reg[2] = {
  26                                 (struct ddr_cmd_regs *)DDR_PHY_CMD_ADDR,
  27                                 (struct ddr_cmd_regs *)DDR_PHY_CMD_ADDR2};
  28
  29 static struct ddr_data_regs *ddr_data_reg[2] = {
  30                                 (struct ddr_data_regs *)DDR_PHY_DATA_ADDR,
  31                                 (struct ddr_data_regs *)DDR_PHY_DATA_ADDR2};
  32
  33 /**
  34  * Base address for ddr io control instances
  35  */
  36 static struct ddr_cmdtctrl *ioctrl_reg = {
  37                         (struct ddr_cmdtctrl *)DDR_CONTROL_BASE_ADDR};
  38
  39 /**
  40  * Configure SDRAM
  41  */
  42 void config_sdram(const struct emif_regs *regs, int nr)
  43 {
  44         if (regs->zq_config) {
  45                 /*
  46                  * A value of 0x2800 for the REF CTRL will give us
  47                  * about 570us for a delay, which will be long enough
  48                  * to configure things.
  49                  */
  50                 writel(0x2800, &emif_reg[nr]->emif_sdram_ref_ctrl);
  51                 writel(regs->zq_config, &emif_reg[nr]->emif_zq_config);
  52                 writel(regs->sdram_config, &cstat->secure_emif_sdram_config);
  53                 writel(regs->sdram_config, &emif_reg[nr]->emif_sdram_config);
  54                 writel(regs->ref_ctrl, &emif_reg[nr]->emif_sdram_ref_ctrl);
  55                 writel(regs->ref_ctrl, &emif_reg[nr]->emif_sdram_ref_ctrl_shdw);
  56         }
  57         writel(regs->ref_ctrl, &emif_reg[nr]->emif_sdram_ref_ctrl);
  58         writel(regs->ref_ctrl, &emif_reg[nr]->emif_sdram_ref_ctrl_shdw);
  59         writel(regs->sdram_config, &emif_reg[nr]->emif_sdram_config);
  60 }
  61
  62 /**
  63  * Set SDRAM timings
  64  */
  65 void set_sdram_timings(const struct emif_regs *regs, int nr)
  66 {
  67         writel(regs->sdram_tim1, &emif_reg[nr]->emif_sdram_tim_1);
  68         writel(regs->sdram_tim1, &emif_reg[nr]->emif_sdram_tim_1_shdw);
  69         writel(regs->sdram_tim2, &emif_reg[nr]->emif_sdram_tim_2);
  70         writel(regs->sdram_tim2, &emif_reg[nr]->emif_sdram_tim_2_shdw);
  71         writel(regs->sdram_tim3, &emif_reg[nr]->emif_sdram_tim_3);
  72         writel(regs->sdram_tim3, &emif_reg[nr]->emif_sdram_tim_3_shdw);
  73 }
  74
  75 /**
  76  * Configure DDR PHY
  77  */
  78 void config_ddr_phy(const struct emif_regs *regs, int nr)
  79 {
  80         writel(regs->emif_ddr_phy_ctlr_1,
  81                 &emif_reg[nr]->emif_ddr_phy_ctrl_1);
  82         writel(regs->emif_ddr_phy_ctlr_1,
  83                 &emif_reg[nr]->emif_ddr_phy_ctrl_1_shdw);
  84 }
  85
  86 /**
  87  * Configure DDR CMD control registers
  88  */
  89 void config_cmd_ctrl(const struct cmd_control *cmd, int nr)
  90 {
  91         writel(cmd->cmd0csratio, &ddr_cmd_reg[nr]->cm0csratio);
  92         writel(cmd->cmd0iclkout, &ddr_cmd_reg[nr]->cm0iclkout);
  93
  94         writel(cmd->cmd1csratio, &ddr_cmd_reg[nr]->cm1csratio);
  95         writel(cmd->cmd1iclkout, &ddr_cmd_reg[nr]->cm1iclkout);
  96
  97         writel(cmd->cmd2csratio, &ddr_cmd_reg[nr]->cm2csratio);
  98         writel(cmd->cmd2iclkout, &ddr_cmd_reg[nr]->cm2iclkout);
  99 }
 100
 101 /**
 102  * Configure DDR DATA registers
 103  */
 104 void config_ddr_data(const struct ddr_data *data, int nr)
 105 {
 106         int i;
 107
 108         for (i = 0; i < DDR_DATA_REGS_NR; i++) {
 109                 writel(data->datardsratio0,
 110                         &(ddr_data_reg[nr]+i)->dt0rdsratio0);
 111                 writel(data->datawdsratio0,
 112                         &(ddr_data_reg[nr]+i)->dt0wdsratio0);
 113                 writel(data->datawiratio0,
 114                         &(ddr_data_reg[nr]+i)->dt0wiratio0);
 115                 writel(data->datagiratio0,
 116                         &(ddr_data_reg[nr]+i)->dt0giratio0);
 117                 writel(data->datafwsratio0,
 118                         &(ddr_data_reg[nr]+i)->dt0fwsratio0);
 119                 writel(data->datawrsratio0,
 120                         &(ddr_data_reg[nr]+i)->dt0wrsratio0);
 121         }
 122 }
 123
 124 void config_io_ctrl(unsigned long val)
 125 {
 126         writel(val, &ioctrl_reg->cm0ioctl);
 127         writel(val, &ioctrl_reg->cm1ioctl);
 128         writel(val, &ioctrl_reg->cm2ioctl);
 129         writel(val, &ioctrl_reg->dt0ioctl);
 130         writel(val, &ioctrl_reg->dt1ioctl);
 131 }