omap4: IO settings

Tuning some IO settings for better performance and power.
And consolidate all such IO settings at one place.

Signed-off-by: Aneesh V <aneesh@ti.com>
Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>

4 files changed, 105 insertions, 45 deletions

diff --git a/arch/arm/cpu/armv7/omap4/board.c b/arch/arm/cpu/armv7/omap4/board.c
index 69a0ce5..309b244 100644
--- a/arch/arm/cpu/armv7/omap4/board.c
+++ b/arch/arm/cpu/armv7/omap4/board.c
@@ -70,6 +70,67 @@ u32 omap_boot_mode(void)
 {
 	return omap4_boot_mode;
 }
+
+/*
+ * Some tuning of IOs for optimal power and performance
+ */
+static void do_io_settings(void)
+{
+	u32 lpddr2io;
+	struct control_lpddr2io_regs *lpddr2io_regs =
+		(struct control_lpddr2io_regs *)LPDDR2_IO_REGS_BASE;
+	struct omap4_sys_ctrl_regs *const ctrl =
+		(struct omap4_sys_ctrl_regs *)SYSCTRL_GENERAL_CORE_BASE;
+
+	u32 omap4_rev = omap_revision();
+
+	if (omap4_rev == OMAP4430_ES1_0)
+		lpddr2io = CONTROL_LPDDR2IO_SLEW_125PS_DRV8_PULL_DOWN;
+	else if (omap4_rev == OMAP4430_ES2_0)
+		lpddr2io = CONTROL_LPDDR2IO_SLEW_325PS_DRV8_GATE_KEEPER;
+	else
+		lpddr2io = CONTROL_LPDDR2IO_SLEW_315PS_DRV12_PULL_DOWN;
+
+	/* EMIF1 */
+	writel(lpddr2io, &lpddr2io_regs->control_lpddr2io1_0);
+	writel(lpddr2io, &lpddr2io_regs->control_lpddr2io1_1);
+	/* No pull for GR10 as per hw team's recommendation */
+	writel(lpddr2io & ~LPDDR2IO_GR10_WD_MASK,
+		&lpddr2io_regs->control_lpddr2io1_2);
+	writel(CONTROL_LPDDR2IO_3_VAL, &lpddr2io_regs->control_lpddr2io1_3);
+
+	/* EMIF2 */
+	writel(lpddr2io, &lpddr2io_regs->control_lpddr2io2_0);
+	writel(lpddr2io, &lpddr2io_regs->control_lpddr2io2_1);
+	/* No pull for GR10 as per hw team's recommendation */
+	writel(lpddr2io & ~LPDDR2IO_GR10_WD_MASK,
+		&lpddr2io_regs->control_lpddr2io2_2);
+	writel(CONTROL_LPDDR2IO_3_VAL, &lpddr2io_regs->control_lpddr2io2_3);
+
+	/*
+	 * Some of these settings (TRIM values) come from eFuse and are
+	 * in turn programmed in the eFuse at manufacturing time after
+	 * calibration of the device. Do the software over-ride only if
+	 * the device is not correctly trimmed
+	 */
+	if (!(readl(&ctrl->control_std_fuse_opp_bgap) & 0xFFFF)) {
+
+		writel(LDOSRAM_VOLT_CTRL_OVERRIDE,
+			&ctrl->control_ldosram_iva_voltage_ctrl);
+
+		writel(LDOSRAM_VOLT_CTRL_OVERRIDE,
+			&ctrl->control_ldosram_mpu_voltage_ctrl);
+
+		writel(LDOSRAM_VOLT_CTRL_OVERRIDE,
+			&ctrl->control_ldosram_core_voltage_ctrl);
+	}
+
+	if (!readl(&ctrl->control_efuse_1))
+		writel(CONTROL_EFUSE_1_OVERRIDE, &ctrl->control_efuse_1);
+
+	if (!readl(&ctrl->control_efuse_2))
+		writel(CONTROL_EFUSE_2_OVERRIDE, &ctrl->control_efuse_2);
+}
 #endif
 
 void do_set_mux(u32 base, struct pad_conf_entry const *array, int size)
@@ -197,6 +258,7 @@ void s_init(void)
 	set_mux_conf_regs();
 #ifdef CONFIG_SPL_BUILD
 	preloader_console_init();
+	do_io_settings();
 #endif
 	prcm_init();
 #ifdef CONFIG_SPL_BUILD
diff --git a/arch/arm/cpu/armv7/omap4/emif.c b/arch/arm/cpu/armv7/omap4/emif.c
index 8c46464..988b205 100644
--- a/arch/arm/cpu/armv7/omap4/emif.c
+++ b/arch/arm/cpu/armv7/omap4/emif.c
@@ -1063,30 +1063,6 @@ static void do_sdram_init(u32 base)
 	debug("<<do_sdram_init() %x\n", base);
 }
 
-void sdram_init_pads(void)
-{
-	u32 lpddr2io;
-	struct control_lpddr2io_regs *lpddr2io_regs =
-		(struct control_lpddr2io_regs *)LPDDR2_IO_REGS_BASE;
-	u32 omap4_rev = omap_revision();
-
-	if (omap4_rev == OMAP4430_ES1_0)
-		lpddr2io = CONTROL_LPDDR2IO_SLEW_125PS_DRV8_PULL_DOWN;
-	else if (omap4_rev == OMAP4430_ES2_0)
-		lpddr2io = CONTROL_LPDDR2IO_SLEW_325PS_DRV8_GATE_KEEPER;
-	else
-		return;		/* Post ES2.1 reset values will work */
-
-	writel(lpddr2io, &lpddr2io_regs->control_lpddr2io1_0);
-	writel(lpddr2io, &lpddr2io_regs->control_lpddr2io1_1);
-	writel(lpddr2io, &lpddr2io_regs->control_lpddr2io1_2);
-	writel(lpddr2io, &lpddr2io_regs->control_lpddr2io2_0);
-	writel(lpddr2io, &lpddr2io_regs->control_lpddr2io2_1);
-	writel(lpddr2io, &lpddr2io_regs->control_lpddr2io2_2);
-
-	writel(CONTROL_EFUSE_2_NMOS_PMOS_PTV_CODE_1, CONTROL_EFUSE_2);
-}
-
 static void emif_post_init_config(u32 base)
 {
 	struct emif_reg_struct *emif = (struct emif_reg_struct *)base;
@@ -1243,7 +1219,6 @@ void sdram_init(void)
 	debug("in_sdram = %d\n", in_sdram);
 
 	if (!in_sdram) {
-		sdram_init_pads();
 		bypass_dpll(&prcm->cm_clkmode_dpll_core);
 	}
 
diff --git a/arch/arm/include/asm/arch-omap4/emif.h b/arch/arm/include/asm/arch-omap4/emif.h
index 6845c65..3a549ba 100644
--- a/arch/arm/include/asm/arch-omap4/emif.h
+++ b/arch/arm/include/asm/arch-omap4/emif.h
@@ -593,17 +593,6 @@ struct dmm_lisa_map_regs {
 	u32 dmm_lisa_map_3;
 };
 
-struct control_lpddr2io_regs {
-	u32 control_lpddr2io1_0;
-	u32 control_lpddr2io1_1;
-	u32 control_lpddr2io1_2;
-	u32 control_lpddr2io1_3;
-	u32 control_lpddr2io2_0;
-	u32 control_lpddr2io2_1;
-	u32 control_lpddr2io2_2;
-	u32 control_lpddr2io2_3;
-};
-
 #define CS0	0
 #define CS1	1
 /* The maximum frequency at which the LPDDR2 interface can operate in Hz*/
@@ -823,13 +812,6 @@ struct control_lpddr2io_regs {
 /* MR16 value: refresh full array(no partial array self refresh) */
 #define MR16_REF_FULL_ARRAY	0
 
-/* LPDDR2 IO regs */
-#define CONTROL_LPDDR2IO_SLEW_125PS_DRV8_PULL_DOWN	0x1C1C1C1C
-#define CONTROL_LPDDR2IO_SLEW_325PS_DRV8_GATE_KEEPER	0x9E9E9E9E
-
-/* CONTROL_EFUSE_2 */
-#define CONTROL_EFUSE_2_NMOS_PMOS_PTV_CODE_1		0x00ffc000
-
 /*
  * Maximum number of entries we keep in our array of timing tables
  * We need not keep all the speed bins supported by the device
diff --git a/arch/arm/include/asm/arch-omap4/omap4.h b/arch/arm/include/asm/arch-omap4/omap4.h
index 7ff46d7..a6e1e42 100644
--- a/arch/arm/include/asm/arch-omap4/omap4.h
+++ b/arch/arm/include/asm/arch-omap4/omap4.h
@@ -54,8 +54,6 @@
 /* LPDDR2 IO regs */
 #define LPDDR2_IO_REGS_BASE	0x4A100638
 
-#define CONTROL_EFUSE_2		0x4A100704
-
 /* CONTROL_ID_CODE */
 #define CONTROL_ID_CODE		0x4A002204
 
@@ -84,6 +82,9 @@
 /* GPMC */
 #define OMAP44XX_GPMC_BASE	0x50000000
 
+/* SYSTEM CONTROL MODULE */
+#define SYSCTRL_GENERAL_CORE_BASE	0x4A002000
+
 /*
  * Hardware Register Details
  */
@@ -108,6 +109,22 @@
 #define PRM_RSTCTRL		PRM_DEVICE_BASE
 #define PRM_RSTCTRL_RESET	0x01
 
+/* Control Module */
+#define LDOSRAM_ACTMODE_VSET_IN_MASK	(0x1F << 5)
+#define LDOSRAM_VOLT_CTRL_OVERRIDE	0x0401040f
+#define CONTROL_EFUSE_1_OVERRIDE	0x1C4D0110
+#define CONTROL_EFUSE_2_OVERRIDE	0x00084000
+
+/* LPDDR2 IO regs */
+#define CONTROL_LPDDR2IO_SLEW_125PS_DRV8_PULL_DOWN	0x1C1C1C1C
+#define CONTROL_LPDDR2IO_SLEW_325PS_DRV8_GATE_KEEPER	0x9E9E9E9E
+#define CONTROL_LPDDR2IO_SLEW_315PS_DRV12_PULL_DOWN	0x7C7C7C7C
+#define LPDDR2IO_GR10_WD_MASK				(3 << 17)
+#define CONTROL_LPDDR2IO_3_VAL		0xA0888C00
+
+/* CONTROL_EFUSE_2 */
+#define CONTROL_EFUSE_2_NMOS_PMOS_PTV_CODE_1		0x00ffc000
+
 #ifndef __ASSEMBLY__
 
 struct s32ktimer {
@@ -115,6 +132,30 @@ struct s32ktimer {
 	unsigned int s32k_cr;	/* 0x10 */
 };
 
+struct omap4_sys_ctrl_regs {
+	unsigned int pad1[129];
+	unsigned int control_id_code;			/* 0x4A002204 */
+	unsigned int pad11[22];
+	unsigned int control_std_fuse_opp_bgap;		/* 0x4a002260 */
+	unsigned int pad2[47];
+	unsigned int control_ldosram_iva_voltage_ctrl;	/* 0x4A002320 */
+	unsigned int control_ldosram_mpu_voltage_ctrl;	/* 0x4A002324 */
+	unsigned int control_ldosram_core_voltage_ctrl;	/* 0x4A002328 */
+	unsigned int pad3[260341];
+	unsigned int control_efuse_1;			/* 0x4A100700 */
+	unsigned int control_efuse_2;			/* 0x4A100704 */
+};
+
+struct control_lpddr2io_regs {
+	unsigned int control_lpddr2io1_0;
+	unsigned int control_lpddr2io1_1;
+	unsigned int control_lpddr2io1_2;
+	unsigned int control_lpddr2io1_3;
+	unsigned int control_lpddr2io2_0;
+	unsigned int control_lpddr2io2_1;
+	unsigned int control_lpddr2io2_2;
+	unsigned int control_lpddr2io2_3;
+};
 #endif /* __ASSEMBLY__ */
 
 /*