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u-boot/arch/arm/mach-imx/mx7/ddr.c
Marek Vasut 0e06d63d19 ARM: imx: ddr: Add missing PHY reset 
The iMX7D RM 9.2.4.9.3 Power removal flow Table 9-11. Re-enabling power
explicitly says both the DDR controller and the PHY must be reset in the
correct sequence. Currently the code only resets the controller. This
leads to a misbehavior where the system brings the DRAM up after reboot,
but the DRAM is unstable. Add the missing reset.

The easiest way to trigger this is by triggering WDT without having the
WDT assert WDOG_B signal, i.e. mw.w 0x30280000 0x25 .

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: NXP i.MX U-Boot Team <uboot-imx@nxp.com>
Cc: Peng Fan <peng.fan@nxp.com>
Cc: Stefano Babic <sbabic@denx.de>
2020-06-08 10:42:54 +02:00

220 lines
7.9 KiB
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// SPDX-License-Identifier: GPL-2.0+
/*
* DDR controller configuration for the i.MX7 architecture
*
* (C) Copyright 2017 CompuLab, Ltd. http://www.compulab.com
*
* Author: Uri Mashiach <uri.mashiach@compulab.co.il>
*/
#include <linux/types.h>
#include <asm/io.h>
#include <asm/arch/imx-regs.h>
#include <asm/arch/crm_regs.h>
#include <asm/arch/mx7-ddr.h>
#include <common.h>
#include <linux/delay.h>
/*
* Routine: mx7_dram_cfg
* Description: DDR controller configuration
*
* @ddrc_regs_val: DDRC registers value
* @ddrc_mp_val: DDRC_MP registers value
* @ddr_phy_regs_val: DDR_PHY registers value
* @calib_param: calibration parameters
*
*/
void mx7_dram_cfg(struct ddrc *ddrc_regs_val, struct ddrc_mp *ddrc_mp_val,
struct ddr_phy *ddr_phy_regs_val,
struct mx7_calibration *calib_param)
{
struct src *const src_regs = (struct src *)SRC_BASE_ADDR;
struct ddrc *const ddrc_regs = (struct ddrc *)DDRC_IPS_BASE_ADDR;
struct ddrc_mp *const ddrc_mp_reg = (struct ddrc_mp *)DDRC_MP_BASE_ADDR;
struct ddr_phy *const ddr_phy_regs =
(struct ddr_phy *)DDRPHY_IPS_BASE_ADDR;
struct iomuxc_gpr_base_regs *const iomuxc_gpr_regs =
(struct iomuxc_gpr_base_regs *)IOMUXC_GPR_BASE_ADDR;
int i;
/*
* iMX7D RM 9.2.4.9.3 Power removal flow Table 9-11. Re-enabling power
* row 2 says "Reset controller / PHY by driving core_ddrc_rst = 0 ,
* aresetn_n = 0, presetn = 0. That means reset everything.
*/
writel(SRC_DDRC_RCR_DDRC_CORE_RST_MASK | SRC_DDRC_RCR_DDRC_PRST_MASK,
&src_regs->ddrc_rcr);
/*
* iMX7D RM 6.2.7.26 SRC_DDRC_RCR says wait 30 cycles (of unknown).
* If we assume this is 30 cycles at 100 MHz (about the rate of a
* DRAM bus), that's 300 nS, so waiting 10 uS is more then plenty.
*/
udelay(10);
/* De-assert DDR Controller 'preset' and DDR PHY reset */
clrbits_le32(&src_regs->ddrc_rcr, SRC_DDRC_RCR_DDRC_PRST_MASK);
/* DDR controller configuration */
writel(ddrc_regs_val->mstr, &ddrc_regs->mstr);
writel(ddrc_regs_val->rfshtmg, &ddrc_regs->rfshtmg);
writel(ddrc_mp_val->pctrl_0, &ddrc_mp_reg->pctrl_0);
writel(ddrc_regs_val->init1, &ddrc_regs->init1);
writel(ddrc_regs_val->init0, &ddrc_regs->init0);
writel(ddrc_regs_val->init3, &ddrc_regs->init3);
writel(ddrc_regs_val->init4, &ddrc_regs->init4);
writel(ddrc_regs_val->init5, &ddrc_regs->init5);
writel(ddrc_regs_val->rankctl, &ddrc_regs->rankctl);
writel(ddrc_regs_val->dramtmg0, &ddrc_regs->dramtmg0);
writel(ddrc_regs_val->dramtmg1, &ddrc_regs->dramtmg1);
writel(ddrc_regs_val->dramtmg2, &ddrc_regs->dramtmg2);
writel(ddrc_regs_val->dramtmg3, &ddrc_regs->dramtmg3);
writel(ddrc_regs_val->dramtmg4, &ddrc_regs->dramtmg4);
writel(ddrc_regs_val->dramtmg5, &ddrc_regs->dramtmg5);
writel(ddrc_regs_val->dramtmg8, &ddrc_regs->dramtmg8);
writel(ddrc_regs_val->zqctl0, &ddrc_regs->zqctl0);
writel(ddrc_regs_val->dfitmg0, &ddrc_regs->dfitmg0);
writel(ddrc_regs_val->dfitmg1, &ddrc_regs->dfitmg1);
writel(ddrc_regs_val->dfiupd0, &ddrc_regs->dfiupd0);
writel(ddrc_regs_val->dfiupd1, &ddrc_regs->dfiupd1);
writel(ddrc_regs_val->dfiupd2, &ddrc_regs->dfiupd2);
writel(ddrc_regs_val->addrmap0, &ddrc_regs->addrmap0);
writel(ddrc_regs_val->addrmap1, &ddrc_regs->addrmap1);
writel(ddrc_regs_val->addrmap4, &ddrc_regs->addrmap4);
writel(ddrc_regs_val->addrmap5, &ddrc_regs->addrmap5);
writel(ddrc_regs_val->addrmap6, &ddrc_regs->addrmap6);
writel(ddrc_regs_val->odtcfg, &ddrc_regs->odtcfg);
writel(ddrc_regs_val->odtmap, &ddrc_regs->odtmap);
/* De-assert DDR Controller 'core_ddrc_rstn' and 'aresetn' */
clrbits_le32(&src_regs->ddrc_rcr, SRC_DDRC_RCR_DDRC_CORE_RST_MASK);
/* PHY configuration */
writel(ddr_phy_regs_val->phy_con0, &ddr_phy_regs->phy_con0);
writel(ddr_phy_regs_val->phy_con1, &ddr_phy_regs->phy_con1);
writel(ddr_phy_regs_val->phy_con4, &ddr_phy_regs->phy_con4);
writel(ddr_phy_regs_val->mdll_con0, &ddr_phy_regs->mdll_con0);
writel(ddr_phy_regs_val->drvds_con0, &ddr_phy_regs->drvds_con0);
writel(ddr_phy_regs_val->offset_wr_con0, &ddr_phy_regs->offset_wr_con0);
writel(ddr_phy_regs_val->offset_rd_con0, &ddr_phy_regs->offset_rd_con0);
writel(ddr_phy_regs_val->cmd_sdll_con0 |
DDR_PHY_CMD_SDLL_CON0_CTRL_RESYNC_MASK,
&ddr_phy_regs->cmd_sdll_con0);
writel(ddr_phy_regs_val->cmd_sdll_con0 &
~DDR_PHY_CMD_SDLL_CON0_CTRL_RESYNC_MASK,
&ddr_phy_regs->cmd_sdll_con0);
writel(ddr_phy_regs_val->offset_lp_con0, &ddr_phy_regs->offset_lp_con0);
/* calibration */
for (i = 0; i < calib_param->num_val; i++)
writel(calib_param->values[i], &ddr_phy_regs->zq_con0);
/* Wake_up DDR PHY */
HW_CCM_CCGR_WR(CCGR_IDX_DDR, CCM_CLK_ON_N_N);
writel(IOMUXC_GPR_GPR8_ddr_phy_ctrl_wake_up(0xf) |
IOMUXC_GPR_GPR8_ddr_phy_dfi_init_start_MASK,
&iomuxc_gpr_regs->gpr[8]);
HW_CCM_CCGR_WR(CCGR_IDX_DDR, CCM_CLK_ON_R_W);
}
/*
* Routine: imx_ddr_size
* Description: extract the current DRAM size from the DDRC registers
*
* @return: DRAM size
*/
unsigned int imx_ddr_size(void)
{
struct ddrc *const ddrc_regs = (struct ddrc *)DDRC_IPS_BASE_ADDR;
u32 reg_val, field_val;
int bits = 0;/* Number of address bits */
/* Count data bus width bits */
reg_val = readl(&ddrc_regs->mstr);
field_val = (reg_val & MSTR_DATA_BUS_WIDTH_MASK) >> MSTR_DATA_BUS_WIDTH_SHIFT;
bits += 2 - field_val;
/* Count rank address bits */
field_val = (reg_val & MSTR_DATA_ACTIVE_RANKS_MASK) >> MSTR_DATA_ACTIVE_RANKS_SHIFT;
if (field_val > 1)
bits += field_val - 1;
/* Count column address bits */
bits += 2;/* Column address 0 and 1 are fixed mapped */
reg_val = readl(&ddrc_regs->addrmap2);
field_val = (reg_val & ADDRMAP2_COL_B2_MASK) >> ADDRMAP2_COL_B2_SHIFT;
if (field_val <= 7)
bits++;
field_val = (reg_val & ADDRMAP2_COL_B3_MASK) >> ADDRMAP2_COL_B3_SHIFT;
if (field_val <= 7)
bits++;
field_val = (reg_val & ADDRMAP2_COL_B4_MASK) >> ADDRMAP2_COL_B4_SHIFT;
if (field_val <= 7)
bits++;
field_val = (reg_val & ADDRMAP2_COL_B5_MASK) >> ADDRMAP2_COL_B5_SHIFT;
if (field_val <= 7)
bits++;
reg_val = readl(&ddrc_regs->addrmap3);
field_val = (reg_val & ADDRMAP3_COL_B6_MASK) >> ADDRMAP3_COL_B6_SHIFT;
if (field_val <= 7)
bits++;
field_val = (reg_val & ADDRMAP3_COL_B7_MASK) >> ADDRMAP3_COL_B7_SHIFT;
if (field_val <= 7)
bits++;
field_val = (reg_val & ADDRMAP3_COL_B8_MASK) >> ADDRMAP3_COL_B8_SHIFT;
if (field_val <= 7)
bits++;
field_val = (reg_val & ADDRMAP3_COL_B9_MASK) >> ADDRMAP3_COL_B9_SHIFT;
if (field_val <= 7)
bits++;
reg_val = readl(&ddrc_regs->addrmap4);
field_val = (reg_val & ADDRMAP4_COL_B10_MASK) >> ADDRMAP4_COL_B10_SHIFT;
if (field_val <= 7)
bits++;
field_val = (reg_val & ADDRMAP4_COL_B11_MASK) >> ADDRMAP4_COL_B11_SHIFT;
if (field_val <= 7)
bits++;
/* Count row address bits */
reg_val = readl(&ddrc_regs->addrmap5);
field_val = (reg_val & ADDRMAP5_ROW_B0_MASK) >> ADDRMAP5_ROW_B0_SHIFT;
if (field_val <= 11)
bits++;
field_val = (reg_val & ADDRMAP5_ROW_B1_MASK) >> ADDRMAP5_ROW_B1_SHIFT;
if (field_val <= 11)
bits++;
field_val = (reg_val & ADDRMAP5_ROW_B2_10_MASK) >> ADDRMAP5_ROW_B2_10_SHIFT;
if (field_val <= 11)
bits += 9;
field_val = (reg_val & ADDRMAP5_ROW_B11_MASK) >> ADDRMAP5_ROW_B11_SHIFT;
if (field_val <= 11)
bits++;
reg_val = readl(&ddrc_regs->addrmap6);
field_val = (reg_val & ADDRMAP6_ROW_B12_MASK) >> ADDRMAP6_ROW_B12_SHIFT;
if (field_val <= 11)
bits++;
field_val = (reg_val & ADDRMAP6_ROW_B13_MASK) >> ADDRMAP6_ROW_B13_SHIFT;
if (field_val <= 11)
bits++;
field_val = (reg_val & ADDRMAP6_ROW_B14_MASK) >> ADDRMAP6_ROW_B14_SHIFT;
if (field_val <= 11)
bits++;
field_val = (reg_val & ADDRMAP6_ROW_B15_MASK) >> ADDRMAP6_ROW_B15_SHIFT;
if (field_val <= 11)
bits++;
/* Count bank bits */
reg_val = readl(&ddrc_regs->addrmap1);
field_val = (reg_val & ADDRMAP1_BANK_B0_MASK) >> ADDRMAP1_BANK_B0_SHIFT;
if (field_val <= 30)
bits++;
field_val = (reg_val & ADDRMAP1_BANK_B1_MASK) >> ADDRMAP1_BANK_B1_SHIFT;
if (field_val <= 30)
bits++;
field_val = (reg_val & ADDRMAP1_BANK_B2_MASK) >> ADDRMAP1_BANK_B2_SHIFT;
if (field_val <= 29)
bits++;
/* cap to max 2 GB */
if (bits > 31)
bits = 31;
return 1 << bits;
}
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