From: Murali Karicheri m-karicheri2@ti.com

This patch implements a workaround to fix DDR3 memory issue. The code for workaround detects PGSR0 errors and then preps for and executes a software-controlled hard reset.In board_early_init, where logic has been added to identify whether or not the previous reset was a PORz. PLL initialization is skipped in the case of a software-controlled hard reset.

Signed-off-by: Murali Karicheri m-karicheri2@ti.com Signed-off-by: Keegan Garcia kgarcia@ti.com Signed-off-by: Ivan Khoronzhuk ivan.khoronzhuk@ti.com ---

Based on "[U-boot] [Patch 0/6] keystone2: add k2l SoC and k2l_evm board support" series http://www.mail-archive.com/u-boot@lists.denx.de/msg146472.html

arch/arm/cpu/armv7/keystone/ddr3.c | 73 +++++++++++++++++++++++++++ arch/arm/include/asm/arch-keystone/ddr3.h | 1 + arch/arm/include/asm/arch-keystone/hardware.h | 2 + board/ti/ks2_evm/ddr3_k2hk.c | 4 ++ 4 files changed, 80 insertions(+)

diff --git a/arch/arm/cpu/armv7/keystone/ddr3.c b/arch/arm/cpu/armv7/keystone/ddr3.c index 2391e79..8cb9279 100644 --- a/arch/arm/cpu/armv7/keystone/ddr3.c +++ b/arch/arm/cpu/armv7/keystone/ddr3.c @@ -10,6 +10,7 @@ #include <asm/io.h> #include <common.h> #include <asm/arch/ddr3.h> +#include <asm/arch/psc_defs.h>

void ddr3_init_ddrphy(u32 base, struct ddr3_phy_config *phy_cfg) { @@ -86,3 +87,75 @@ void ddr3_reset_ddrphy(void) tmp &= ~KS2_DDR3_PLLCTRL_PHY_RESET; __raw_writel(tmp, KS2_DDR3APLLCTL1); } + +/** + * ddr3_reset_workaround - reset workaround in case if leveling error + * detected for PG 1.0 and 1.1 k2hk SoCs + */ +void ddr3_err_reset_workaround(void) +{ + unsigned int tmp; + unsigned int tmp_a; + unsigned int tmp_b; + + /* + * Check for PGSR0 error bits of DDR3 PHY. + * Check for WLERR, QSGERR, WLAERR, + * RDERR, WDERR, REERR, WEERR error to see if they are set or not + */ + tmp_a = __raw_readl(KS2_DDR3A_DDRPHYC + KS2_DDRPHY_PGSR0_OFFSET); + tmp_b = __raw_readl(KS2_DDR3B_DDRPHYC + KS2_DDRPHY_PGSR0_OFFSET); + + if (((tmp_a & 0x0FE00000) != 0) || ((tmp_b & 0x0FE00000) != 0)) { + printf("DDR Leveling Error Detected!\n"); + printf("DDR3A PGSR0 = 0x%x\n", tmp_a); + printf("DDR3B PGSR0 = 0x%x\n", tmp_b); + + /* + * Write Keys to KICK registers to enable writes to registers + * in boot config space + */ + __raw_writel(KS2_KICK0_MAGIC, KS2_KICK0); + __raw_writel(KS2_KICK1_MAGIC, KS2_KICK1); + + /* + * Move DDR3A Module out of reset isolation by setting + * MDCTL23[12] = 0 + */ + tmp_a = __raw_readl(KS2_PSC_BASE + + PSC_REG_MDCTL(KS2_LPSC_EMIF4F_DDR3A)); + + tmp_a = PSC_REG_MDCTL_SET_RESET_ISO(tmp_a, 0); + __raw_writel(tmp_a, KS2_PSC_BASE + + PSC_REG_MDCTL(KS2_LPSC_EMIF4F_DDR3A)); + + /* + * Move DDR3B Module out of reset isolation by setting + * MDCTL24[12] = 0 + */ + tmp_b = __raw_readl(KS2_PSC_BASE + + PSC_REG_MDCTL(KS2_LPSC_EMIF4F_DDR3B)); + tmp_b = PSC_REG_MDCTL_SET_RESET_ISO(tmp_b, 0); + __raw_writel(tmp_b, KS2_PSC_BASE + + PSC_REG_MDCTL(KS2_LPSC_EMIF4F_DDR3B)); + + /* + * Write 0x5A69 Key to RSTCTRL[15:0] to unlock writes + * to RSTCTRL and RSTCFG + */ + tmp = __raw_readl(KS2_RSTCTRL); + tmp &= KS2_RSTCTRL_MASK; + tmp |= KS2_RSTCTRL_KEY; + __raw_writel(tmp, KS2_RSTCTRL); + + /* + * Set PLL Controller to drive hard reset on SW trigger by + * setting RSTCFG[13] = 0 + */ + tmp = __raw_readl(KS2_RSTCTRL_RSCFG); + tmp &= ~KS2_RSTYPE_PLL_SOFT; + __raw_writel(tmp, KS2_RSTCTRL_RSCFG); + + reset_cpu(0); + } +} diff --git a/arch/arm/include/asm/arch-keystone/ddr3.h b/arch/arm/include/asm/arch-keystone/ddr3.h index 4d229a2..6bf35d3 100644 --- a/arch/arm/include/asm/arch-keystone/ddr3.h +++ b/arch/arm/include/asm/arch-keystone/ddr3.h @@ -50,6 +50,7 @@ struct ddr3_emif_config {

void ddr3_init(void); void ddr3_reset_ddrphy(void); +void ddr3_err_reset_workaround(void); void ddr3_init_ddrphy(u32 base, struct ddr3_phy_config *phy_cfg); void ddr3_init_ddremif(u32 base, struct ddr3_emif_config *emif_cfg);

diff --git a/arch/arm/include/asm/arch-keystone/hardware.h b/arch/arm/include/asm/arch-keystone/hardware.h index 2eec4e7..29f7bf1 100644 --- a/arch/arm/include/asm/arch-keystone/hardware.h +++ b/arch/arm/include/asm/arch-keystone/hardware.h @@ -121,9 +121,11 @@ typedef volatile unsigned int *dv_reg_p; #define KS2_CLOCK_BASE KS2_PLL_CNTRL_BASE #define KS2_RSTCTRL_RSTYPE (KS2_PLL_CNTRL_BASE + 0xe4) #define KS2_RSTCTRL (KS2_PLL_CNTRL_BASE + 0xe8) +#define KS2_RSTCTRL_RSCFG (KS2_PLL_CNTRL_BASE + 0xec) #define KS2_RSTCTRL_KEY 0x5a69 #define KS2_RSTCTRL_MASK 0xffff0000 #define KS2_RSTCTRL_SWRST 0xfffe0000 +#define KS2_RSTYPE_PLL_SOFT BIT(13)

/* SPI */ #define KS2_SPI0_BASE 0x21000400 diff --git a/board/ti/ks2_evm/ddr3_k2hk.c b/board/ti/ks2_evm/ddr3_k2hk.c index 21a5a0a..6070a99 100644 --- a/board/ti/ks2_evm/ddr3_k2hk.c +++ b/board/ti/ks2_evm/ddr3_k2hk.c @@ -81,4 +81,8 @@ void ddr3_init(void) while (1) ; } + + /* Apply the workaround for PG 1.0 and 1.1 Silicons */ + if (cpu_revision() <= 1) + ddr3_err_reset_workaround(); }