4 files changed, 124 insertions, 1 deletions

diff --git a/arch/arm/cpu/armv7/omap-common/emif-common.c b/arch/arm/cpu/armv7/omap-common/emif-common.c
index dc1ea1d..5a3f285 100644
--- a/arch/arm/cpu/armv7/omap-common/emif-common.c
+++ b/arch/arm/cpu/armv7/omap-common/emif-common.c
@@ -1286,6 +1286,42 @@ void dmm_init(u32 base)
 
 }
 
+static void do_bug0039_workaround(u32 base)
+{
+	u32 val, i, clkctrl;
+	struct emif_reg_struct *emif_base = (struct emif_reg_struct *)base;
+	const struct read_write_regs *bug_00339_regs;
+	u32 iterations;
+	u32 *phy_status_base = &emif_base->emif_ddr_phy_status[0];
+	u32 *phy_ctrl_base = &emif_base->emif_ddr_ext_phy_ctrl_1;
+
+	if (is_dra7xx())
+		phy_status_base++;
+
+	bug_00339_regs = get_bug_regs(&iterations);
+
+	/* Put EMIF in to idle */
+	clkctrl = __raw_readl((*prcm)->cm_memif_clkstctrl);
+	__raw_writel(0x0, (*prcm)->cm_memif_clkstctrl);
+
+	/* Copy the phy status registers in to phy ctrl shadow registers */
+	for (i = 0; i < iterations; i++) {
+		val = __raw_readl(phy_status_base +
+				  bug_00339_regs[i].read_reg - 1);
+
+		__raw_writel(val, phy_ctrl_base +
+			     ((bug_00339_regs[i].write_reg - 1) << 1));
+
+		__raw_writel(val, phy_ctrl_base +
+			     (bug_00339_regs[i].write_reg << 1) - 1);
+	}
+
+	/* Disable leveling */
+	writel(0x0, &emif_base->emif_rd_wr_lvl_rmp_ctl);
+
+	__raw_writel(clkctrl,  (*prcm)->cm_memif_clkstctrl);
+}
+
 /*
  * SDRAM initialization:
  * SDRAM initialization has two parts:
@@ -1361,5 +1397,11 @@ void sdram_init(void)
 			debug("get_ram_size() successful");
 	}
 
+	if (sdram_type == EMIF_SDRAM_TYPE_DDR3 &&
+	    (!in_sdram && !warm_reset())) {
+		do_bug0039_workaround(EMIF1_BASE);
+		do_bug0039_workaround(EMIF2_BASE);
+	}
+
 	debug("<<sdram_init()\n");
 }
diff --git a/arch/arm/cpu/armv7/omap4/sdram_elpida.c b/arch/arm/cpu/armv7/omap4/sdram_elpida.c
index e4c8316..811e776 100644
--- a/arch/arm/cpu/armv7/omap4/sdram_elpida.c
+++ b/arch/arm/cpu/armv7/omap4/sdram_elpida.c
@@ -321,3 +321,8 @@ void get_lpddr2_mr_regs(const struct lpddr2_mr_regs **regs)
 {
 	*regs = &mr_regs;
 }
+
+__weak const struct read_write_regs *get_bug_regs(u32 *iterations)
+{
+	return 0;
+}
diff --git a/arch/arm/cpu/armv7/omap5/sdram.c b/arch/arm/cpu/armv7/omap5/sdram.c
index 2aae3ef..2e18706 100644
--- a/arch/arm/cpu/armv7/omap5/sdram.c
+++ b/arch/arm/cpu/armv7/omap5/sdram.c
@@ -569,6 +569,74 @@ static const struct lpddr2_device_timings dev_4G_S4_timings = {
 	.min_tck	= &min_tck,
 };
 
+/*
+ * List of status registers to be controlled back to control registers
+ * after initial leveling
+ * readreg, writereg
+ */
+const struct read_write_regs omap5_bug_00339_regs[] = {
+	{ 8,  5 },
+	{ 9,  6 },
+	{ 10, 7 },
+	{ 14, 8 },
+	{ 15, 9 },
+	{ 16, 10 },
+	{ 11, 2 },
+	{ 12, 3 },
+	{ 13, 4 },
+	{ 17, 11 },
+	{ 18, 12 },
+	{ 19, 13 },
+};
+
+const struct read_write_regs dra_bug_00339_regs[] = {
+	{ 7,  7 },
+	{ 8,  8 },
+	{ 9,  9 },
+	{ 10, 10 },
+	{ 11, 11 },
+	{ 12, 2 },
+	{ 13, 3 },
+	{ 14, 4 },
+	{ 15, 5 },
+	{ 16, 6 },
+	{ 17, 12 },
+	{ 18, 13 },
+	{ 19, 14 },
+	{ 20, 15 },
+	{ 21, 16 },
+	{ 22, 17 },
+	{ 23, 18 },
+	{ 24, 19 },
+	{ 25, 20 },
+	{ 26, 21}
+};
+
+const struct read_write_regs *get_bug_regs(u32 *iterations)
+{
+	const struct read_write_regs *bug_00339_regs_ptr = NULL;
+
+	switch (omap_revision()) {
+	case OMAP5430_ES1_0:
+	case OMAP5430_ES2_0:
+	case OMAP5432_ES1_0:
+	case OMAP5432_ES2_0:
+		bug_00339_regs_ptr = omap5_bug_00339_regs;
+		*iterations = sizeof(omap5_bug_00339_regs)/
+			     sizeof(omap5_bug_00339_regs[0]);
+		break;
+	case DRA752_ES1_0:
+		bug_00339_regs_ptr = dra_bug_00339_regs;
+		*iterations = sizeof(dra_bug_00339_regs)/
+			     sizeof(dra_bug_00339_regs[0]);
+		break;
+	default:
+		printf("\n Error: UnKnown SOC");
+	}
+
+	return bug_00339_regs_ptr;
+}
+
 void emif_get_device_timings_sdp(u32 emif_nr,
 		const struct lpddr2_device_timings **cs0_device_timings,
 		const struct lpddr2_device_timings **cs1_device_timings)
diff --git a/arch/arm/include/asm/emif.h b/arch/arm/include/asm/emif.h
index c12beea..d9d521a 100644
--- a/arch/arm/include/asm/emif.h
+++ b/arch/arm/include/asm/emif.h
@@ -640,7 +640,9 @@ struct emif_reg_struct {
 	u32 emif_ddr_phy_ctrl_2;
 	u32 padding7[12];
 	u32 emif_rd_wr_exec_thresh;
-	u32 padding8[55];
+	u32 padding8[7];
+	u32 emif_ddr_phy_status[21];
+	u32 padding9[27];
 	u32 emif_ddr_ext_phy_ctrl_1;
 	u32 emif_ddr_ext_phy_ctrl_1_shdw;
 	u32 emif_ddr_ext_phy_ctrl_2;
@@ -1141,6 +1143,11 @@ struct lpddr2_mr_regs {
 	s8 mr16;
 };
 
+struct read_write_regs {
+	u32 read_reg;
+	u32 write_reg;
+};
+
 /* assert macros */
 #if defined(DEBUG)
 #define emif_assert(c)	({ if (!(c)) for (;;); })
@@ -1169,4 +1176,5 @@ extern u32 *const T_den;
 
 void config_data_eye_leveling_samples(u32 emif_base);
 u32 emif_sdram_type(void);
+const struct read_write_regs *get_bug_regs(u32 *iterations);
 #endif