sunxi: Make DRAM_ODT_EN Kconfig setting a bool

Make DRAM_ODT_EN Kconfig setting a bool, add a separate DRAM_ODT_CORRECTION
setting for A23 SoCs and use DRAM_ODT_EN Kconfig everywhere instead of
only in dram_sun4i.c and hardcoding odt_en elsewhere.

Note this commit makes no functional changes for existing boards,
its purpose is to allow changing the odt_en value on future A33 boards.

For sun4i/sun5i/sun7i boards which set DRAM_ODT_EN=y (which no defconfigs
currently do) this patch turns on odt for both the DQ and the DQS lines,
whereas previously it was possibly (but not desirable) to turn odt on only
for one of them by setting the in DRAM_ODT_EN option to 1 or 2 instead of 3.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>

arch/arm/cpu/armv7/sunxi/dram_sun4i.c

@@ -508,7 +508,7 @@ static void mctl_ddr3_initialize(void)
 /*
  * Perform impedance calibration on the DRAM controller side of the wire.
  */
-static void mctl_set_impedance(u32 zq, u32 odt_en)
+static void mctl_set_impedance(u32 zq, bool odt_en)
 {
 	struct sunxi_dram_reg *dram = (struct sunxi_dram_reg *)SUNXI_DRAMC_BASE;
 	u32 reg_val;
@@ -556,7 +556,7 @@ static void mctl_set_impedance(u32 zq, u32 odt_en)
 	clrbits_le32(&dram->zqcr0, DRAM_ZQCR0_ZCAL);
 
 	/* Set I/O configure register */
-	writel(DRAM_IOCR_ODT_EN(odt_en), &dram->iocr);
+	writel(DRAM_IOCR_ODT_EN, &dram->iocr);
 }
 
 static unsigned long dramc_init_helper(struct dram_para *para)

arch/arm/cpu/armv7/sunxi/dram_sun8i_a23.c

@@ -26,12 +26,14 @@
 #include <asm/arch/clock.h>
 #include <asm/arch/dram.h>
 #include <asm/arch/prcm.h>
+#include <linux/kconfig.h>
 
 static const struct dram_para dram_para = {
 	.clock = CONFIG_DRAM_CLK,
 	.type = 3,
 	.zq = CONFIG_DRAM_ZQ,
-	.odt_en = 1,
+	.odt_en = IS_ENABLED(CONFIG_DRAM_ODT_EN),
+	.odt_correction = CONFIG_DRAM_ODT_CORRECTION,
 	.para1 = 0, /* not used (only used when tpr13 bit 31 is set */
 	.para2 = 0, /* not used (only used when tpr13 bit 31 is set */
 	.mr0 = 6736,
@@ -97,7 +99,6 @@ static void mctl_init(u32 *bus_width)
 		(struct sunxi_mctl_ctl_reg *)SUNXI_DRAM_CTL0_BASE;
 	struct sunxi_mctl_phy_reg * const mctl_phy =
 		(struct sunxi_mctl_phy_reg *)SUNXI_DRAM_PHY0_BASE;
-	int correction;
 
 	if (dram_para.tpr13 & 0x20)
 		writel(0x40b, &mctl_phy->dcr);
@@ -138,7 +139,7 @@ static void mctl_init(u32 *bus_width)
 
 	writel(0x01000081, &mctl_phy->dtcr);
 
-	if (dram_para.clock <= 240 || !(dram_para.odt_en & 0x01)) {
+	if (dram_para.clock <= 240 || !dram_para.odt_en) {
 		clrbits_le32(&mctl_phy->dx0gcr, 0x600);
 		clrbits_le32(&mctl_phy->dx1gcr, 0x600);
 	}
@@ -251,13 +252,11 @@ static void mctl_init(u32 *bus_width)
 	} else
 		*bus_width = 16;
 
-	correction = (dram_para.odt_en >> 8) & 0xff;
-	if (correction) {
-		if (dram_para.odt_en & 0x80000000)
-			correction = -correction;
-
-		mctl_apply_odt_correction(&mctl_phy->dx0lcdlr1, correction);
-		mctl_apply_odt_correction(&mctl_phy->dx1lcdlr1, correction);
+	if (dram_para.odt_correction) {
+		mctl_apply_odt_correction(&mctl_phy->dx0lcdlr1,
+					  dram_para.odt_correction);
+		mctl_apply_odt_correction(&mctl_phy->dx1lcdlr1,
+					  dram_para.odt_correction);
 	}
 
 	mctl_await_completion(&mctl_ctl->statr, 0x01, 0x01);

arch/arm/cpu/armv7/sunxi/dram_sun8i_a33.c

@@ -14,12 +14,12 @@
 #include <asm/arch/clock.h>
 #include <asm/arch/dram.h>
 #include <asm/arch/prcm.h>
+#include <linux/kconfig.h>
 
 /* PLL runs at 2x dram-clk, controller runs at PLL / 4 (dram-clk / 2) */
 #define DRAM_CLK_MUL 2
 #define DRAM_CLK_DIV 4
 #define DRAM_SIGMA_DELTA_ENABLE 1
-#define DRAM_ODT_EN 0
 
 struct dram_para {
 	u8 cs1;
@@ -215,7 +215,7 @@ static int mctl_channel_init(struct dram_para *para)
 	clrbits_le32(&mctl_ctl->pgcr0, 0x3f << 0);
 
 	/* Set ODT */
-	if ((CONFIG_DRAM_CLK > 400) && DRAM_ODT_EN) {
+	if ((CONFIG_DRAM_CLK > 400) && IS_ENABLED(CONFIG_DRAM_ODT_EN)) {
 		setbits_le32(DXnGCR0(0), 0x3 << 9);
 		setbits_le32(DXnGCR0(1), 0x3 << 9);
 	} else {

arch/arm/include/asm/arch-sunxi/dram_sun4i.h

@@ -164,8 +164,7 @@ struct dram_para {
 
 #define DRAM_ZQSR_ZDONE (1 << 31) /* ZQ calibration completion flag */
 
-#define DRAM_IOCR_ODT_EN(n) ((((n) & 0x3) << 30) | ((n) & 0x3) << 0)
-#define DRAM_IOCR_ODT_EN_MASK DRAM_IOCR_ODT_EN(0x3)
+#define DRAM_IOCR_ODT_EN ((3 << 30) | (3 << 0))
 
 #define DRAM_MR_BURST_LENGTH(n) (((n) & 0x7) << 0)
 #define DRAM_MR_BURST_LENGTH_MASK DRAM_MR_BURST_LENGTH(0x7)

arch/arm/include/asm/arch-sunxi/dram_sun8i_a23.h

@@ -19,6 +19,7 @@ struct dram_para {
 	u32 type;
 	u32 zq;
 	u32 odt_en;
+	s32 odt_correction;
 	u32 para1;
 	u32 para2;
 	u32 mr0;

board/sunxi/Kconfig

@@ -91,6 +91,13 @@ config DRAM_ZQ
 	---help---
 	Set the dram zq value.
 
+config DRAM_ODT_EN
+	bool "sunxi dram odt enable"
+	default n if !MACH_SUN8I_A23
+	default y if MACH_SUN8I_A23
+	---help---
+	Select this to enable dram odt (on die termination).
+
 if MACH_SUN4I || MACH_SUN5I || MACH_SUN7I
 config DRAM_EMR1
 	int "sunxi dram emr1 value"
@@ -99,13 +106,6 @@ config DRAM_EMR1
 	---help---
 	Set the dram controller emr1 value.
 
-config DRAM_ODT_EN
-	int "sunxi dram odt_en value"
-	default 0
-	---help---
-	Set the dram controller odt_en parameter. This can be used to
-	enable/disable the ODT feature.
-
 config DRAM_TPR3
 	hex "sunxi dram tpr3 value"
 	default 0
@@ -166,6 +166,17 @@ endchoice
 
 endif
 
+if MACH_SUN8I_A23
+config DRAM_ODT_CORRECTION
+	int "sunxi dram odt correction value"
+	default 0
+	---help---
+	Set the dram odt correction value (range -255 - 255). In allwinner
+	fex files, this option is found in bits 8-15 of the u32 odt_en variable
+	in the [dram] section. When bit 31 of the odt_en variable is set
+	then the correction is negative. Usually the value for this is 0.
+endif
+
 config SYS_CLK_FREQ
 	default 912000000 if MACH_SUN7I
 	default 1008000000 if MACH_SUN4I || MACH_SUN5I || MACH_SUN6I || MACH_SUN8I

board/sunxi/dram_sun4i_auto.c

@@ -1,5 +1,6 @@
 #include <common.h>
 #include <asm/arch/dram.h>
+#include <linux/kconfig.h>
 
 static struct dram_para dram_para = {
 	.clock = CONFIG_DRAM_CLK,
@@ -9,7 +10,7 @@ static struct dram_para dram_para = {
 	.io_width = 0,
 	.bus_width = 0,
 	.zq = CONFIG_DRAM_ZQ,
-	.odt_en = CONFIG_DRAM_ODT_EN,
+	.odt_en = IS_ENABLED(CONFIG_DRAM_ODT_EN),
 	.size = 0,
 #ifdef CONFIG_DRAM_TIMINGS_VENDOR_MAGIC
 	.cas = 6,

board/sunxi/dram_sun5i_auto.c

@@ -2,6 +2,7 @@
 
 #include <common.h>
 #include <asm/arch/dram.h>
+#include <linux/kconfig.h>
 
 static struct dram_para dram_para = {
 	.clock = CONFIG_DRAM_CLK,
@@ -12,7 +13,7 @@ static struct dram_para dram_para = {
 	.io_width = 0,
 	.bus_width = 0,
 	.zq = CONFIG_DRAM_ZQ,
-	.odt_en = CONFIG_DRAM_ODT_EN,
+	.odt_en = IS_ENABLED(CONFIG_DRAM_ODT_EN),
 	.size = 0,
 #ifdef CONFIG_DRAM_TIMINGS_VENDOR_MAGIC
 	.cas = 9,