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ARM: DRA7: EMIF: Update SDRAM_REF_CTRL register value 

The value in SDRAM_REF_CTRL controls the delay time between
the initial rising edge of DDR_RESETn to rising edge of DDR_CKE
(JEDEC specs this as 500us). In order to achieve this, SDRAM_REF_CTRL
should be written with a value corresponding to 500us delay before
starting DDR initialization sequence, and configure proper
value at the end of sequence.

Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
This commit is contained in:
Lokesh Vutla 2015-02-16 10:15:56 +05:30 committed by Tom Rini
parent aa8ac43645
commit 802bb57a58
4 changed files with 14 additions and 6 deletions
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4
arch/arm/cpu/armv7/omap-common/emif-common.c
View File

@ -252,6 +252,8 @@ static void ddr3_init(u32 base, const struct emif_regs *regs)
{
struct emif_reg_struct *emif = (struct emif_reg_struct *)base;
writel(regs->ref_ctrl, &emif->emif_sdram_ref_ctrl);
writel(regs->sdram_config_init, &emif->emif_sdram_config);
/*
* Set SDRAM_CONFIG and PHY control registers to locked frequency
* and RL =7. As the default values of the Mode Registers are not
@ -265,7 +267,6 @@ static void ddr3_init(u32 base, const struct emif_regs *regs)
writel(regs->sdram_tim2, &emif->emif_sdram_tim_2);
writel(regs->sdram_tim3, &emif->emif_sdram_tim_3);
writel(regs->ref_ctrl, &emif->emif_sdram_ref_ctrl);
writel(regs->read_idle_ctrl, &emif->emif_read_idlectrl);
/*
@ -274,6 +275,7 @@ static void ddr3_init(u32 base, const struct emif_regs *regs)
*/
if (is_dra7xx()) {
do_ext_phy_settings(base, regs);
writel(regs->ref_ctrl_final, &emif->emif_sdram_ref_ctrl);
writel(regs->sdram_config2, &emif->emif_lpddr2_nvm_config);
writel(regs->sdram_config_init, &emif->emif_sdram_config);
} else {

9
arch/arm/cpu/armv7/omap5/sdram.c
View File

@ -141,7 +141,8 @@ const struct emif_regs emif_1_regs_ddr3_532_mhz_1cs_dra_es1 = {
.sdram_config_init = 0x61851ab2,
.sdram_config = 0x61851ab2,
.sdram_config2 = 0x08000000,
.ref_ctrl = 0x00001035,
.ref_ctrl = 0x000040F1,
.ref_ctrl_final = 0x00001035,
.sdram_tim1 = 0xCCCF36B3,
.sdram_tim2 = 0x308F7FDA,
.sdram_tim3 = 0x027F88A8,
@ -165,7 +166,8 @@ const struct emif_regs emif_2_regs_ddr3_532_mhz_1cs_dra_es1 = {
.sdram_config_init = 0x61851B32,
.sdram_config = 0x61851B32,
.sdram_config2 = 0x08000000,
.ref_ctrl = 0x00001035,
.ref_ctrl = 0x000040F1,
.ref_ctrl_final = 0x00001035,
.sdram_tim1 = 0xCCCF36B3,
.sdram_tim2 = 0x308F7FDA,
.sdram_tim3 = 0x027F88A8,
@ -189,7 +191,8 @@ const struct emif_regs emif_1_regs_ddr3_666_mhz_1cs_dra_es1 = {
.sdram_config_init = 0x61862B32,
.sdram_config = 0x61862B32,
.sdram_config2 = 0x08000000,
.ref_ctrl = 0x0000144A,
.ref_ctrl = 0x0000493E,
.ref_ctrl_final = 0x0000144A,
.sdram_tim1 = 0xD113781C,
.sdram_tim2 = 0x308F7FE3,
.sdram_tim3 = 0x009F86A8,

1
arch/arm/include/asm/emif.h
View File

@ -1149,6 +1149,7 @@ struct emif_regs {
u32 sdram_config;
u32 sdram_config2;
u32 ref_ctrl;
u32 ref_ctrl_final;
u32 sdram_tim1;
u32 sdram_tim2;
u32 sdram_tim3;

6
board/ti/beagle_x15/board.c
View File

@ -47,7 +47,8 @@ static const struct emif_regs beagle_x15_emif1_ddr3_532mhz_emif_regs = {
.sdram_config_init = 0x61851b32,
.sdram_config = 0x61851b32,
.sdram_config2 = 0x00000000,
.ref_ctrl = 0x00001035,
.ref_ctrl = 0x000040F1,
.ref_ctrl_final = 0x00001035,
.sdram_tim1 = 0xceef266b,
.sdram_tim2 = 0x328f7fda,
.sdram_tim3 = 0x027f88a8,
@ -103,7 +104,8 @@ static const struct emif_regs beagle_x15_emif2_ddr3_532mhz_emif_regs = {
.sdram_config_init = 0x61851b32,
.sdram_config = 0x61851b32,
.sdram_config2 = 0x00000000,
.ref_ctrl = 0x00001035,
.ref_ctrl = 0x000040F1,
.ref_ctrl_final = 0x00001035,
.sdram_tim1 = 0xceef266b,
.sdram_tim2 = 0x328f7fda,
.sdram_tim3 = 0x027f88a8,