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39245c8699
Based on the definitive guide to EMIF configuration[1] certain registers that we have been modifying (and are documented registers) should be left in their reset values rather than modified. This has been tested on AM335x GP EVM and Beaglebone White. [1]: http://processors.wiki.ti.com/index.php/AM335x_EMIF_Configuration_tips Cc: Enric Balletbo i Serra <eballetbo@iseebcn.com> Cc: Javier Martinez Canillas <javier@dowhile0.org> Cc: Heiko Schocher <hs@denx.de> Cc: Lars Poeschel <poeschel@lemonage.de> Signed-off-by: Tom Rini <trini@ti.com> Tested-by: Matt Porter <matt.porter@linaro.org>
131 lines
3.7 KiB
C
131 lines
3.7 KiB
C
/*
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* DDR Configuration for AM33xx devices.
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*
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* Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <asm/arch/cpu.h>
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#include <asm/arch/ddr_defs.h>
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#include <asm/arch/sys_proto.h>
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#include <asm/io.h>
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#include <asm/emif.h>
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/**
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* Base address for EMIF instances
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*/
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static struct emif_reg_struct *emif_reg[2] = {
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(struct emif_reg_struct *)EMIF4_0_CFG_BASE,
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(struct emif_reg_struct *)EMIF4_1_CFG_BASE};
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/**
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* Base addresses for DDR PHY cmd/data regs
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*/
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static struct ddr_cmd_regs *ddr_cmd_reg[2] = {
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(struct ddr_cmd_regs *)DDR_PHY_CMD_ADDR,
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(struct ddr_cmd_regs *)DDR_PHY_CMD_ADDR2};
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static struct ddr_data_regs *ddr_data_reg[2] = {
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(struct ddr_data_regs *)DDR_PHY_DATA_ADDR,
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(struct ddr_data_regs *)DDR_PHY_DATA_ADDR2};
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/**
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* Base address for ddr io control instances
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*/
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static struct ddr_cmdtctrl *ioctrl_reg = {
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(struct ddr_cmdtctrl *)DDR_CONTROL_BASE_ADDR};
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/**
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* Configure SDRAM
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*/
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void config_sdram(const struct emif_regs *regs, int nr)
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{
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if (regs->zq_config) {
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/*
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* A value of 0x2800 for the REF CTRL will give us
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* about 570us for a delay, which will be long enough
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* to configure things.
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*/
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writel(0x2800, &emif_reg[nr]->emif_sdram_ref_ctrl);
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writel(regs->zq_config, &emif_reg[nr]->emif_zq_config);
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writel(regs->sdram_config, &cstat->secure_emif_sdram_config);
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writel(regs->sdram_config, &emif_reg[nr]->emif_sdram_config);
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writel(regs->ref_ctrl, &emif_reg[nr]->emif_sdram_ref_ctrl);
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writel(regs->ref_ctrl, &emif_reg[nr]->emif_sdram_ref_ctrl_shdw);
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}
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writel(regs->ref_ctrl, &emif_reg[nr]->emif_sdram_ref_ctrl);
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writel(regs->ref_ctrl, &emif_reg[nr]->emif_sdram_ref_ctrl_shdw);
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writel(regs->sdram_config, &emif_reg[nr]->emif_sdram_config);
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}
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/**
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* Set SDRAM timings
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*/
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void set_sdram_timings(const struct emif_regs *regs, int nr)
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{
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writel(regs->sdram_tim1, &emif_reg[nr]->emif_sdram_tim_1);
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writel(regs->sdram_tim1, &emif_reg[nr]->emif_sdram_tim_1_shdw);
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writel(regs->sdram_tim2, &emif_reg[nr]->emif_sdram_tim_2);
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writel(regs->sdram_tim2, &emif_reg[nr]->emif_sdram_tim_2_shdw);
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writel(regs->sdram_tim3, &emif_reg[nr]->emif_sdram_tim_3);
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writel(regs->sdram_tim3, &emif_reg[nr]->emif_sdram_tim_3_shdw);
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}
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/**
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* Configure DDR PHY
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*/
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void config_ddr_phy(const struct emif_regs *regs, int nr)
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{
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writel(regs->emif_ddr_phy_ctlr_1,
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&emif_reg[nr]->emif_ddr_phy_ctrl_1);
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writel(regs->emif_ddr_phy_ctlr_1,
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&emif_reg[nr]->emif_ddr_phy_ctrl_1_shdw);
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}
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/**
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* Configure DDR CMD control registers
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*/
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void config_cmd_ctrl(const struct cmd_control *cmd, int nr)
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{
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writel(cmd->cmd0csratio, &ddr_cmd_reg[nr]->cm0csratio);
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writel(cmd->cmd0iclkout, &ddr_cmd_reg[nr]->cm0iclkout);
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writel(cmd->cmd1csratio, &ddr_cmd_reg[nr]->cm1csratio);
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writel(cmd->cmd1iclkout, &ddr_cmd_reg[nr]->cm1iclkout);
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writel(cmd->cmd2csratio, &ddr_cmd_reg[nr]->cm2csratio);
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writel(cmd->cmd2iclkout, &ddr_cmd_reg[nr]->cm2iclkout);
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}
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/**
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* Configure DDR DATA registers
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*/
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void config_ddr_data(const struct ddr_data *data, int nr)
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{
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int i;
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for (i = 0; i < DDR_DATA_REGS_NR; i++) {
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writel(data->datardsratio0,
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&(ddr_data_reg[nr]+i)->dt0rdsratio0);
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writel(data->datawdsratio0,
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&(ddr_data_reg[nr]+i)->dt0wdsratio0);
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writel(data->datawiratio0,
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&(ddr_data_reg[nr]+i)->dt0wiratio0);
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writel(data->datagiratio0,
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&(ddr_data_reg[nr]+i)->dt0giratio0);
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writel(data->datafwsratio0,
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&(ddr_data_reg[nr]+i)->dt0fwsratio0);
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writel(data->datawrsratio0,
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&(ddr_data_reg[nr]+i)->dt0wrsratio0);
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}
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}
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void config_io_ctrl(unsigned long val)
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{
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writel(val, &ioctrl_reg->cm0ioctl);
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writel(val, &ioctrl_reg->cm1ioctl);
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writel(val, &ioctrl_reg->cm2ioctl);
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writel(val, &ioctrl_reg->dt0ioctl);
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writel(val, &ioctrl_reg->dt1ioctl);
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}
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