[PATCH] usb: phy: samsung: adding usbphy for Exynos4X12

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This patch adds usb host phy (USB 2.0 PHY) support for Samsung Exynos4X12 SoC.
New functions, samsung_exynos4x12_usb2phy_enable/_disable and selecting
reference clock, for Exynos4X12 are added. Since it has different register
set up with Exynos4210 or Exynos5250, "samsung,exynos4x12-usb2phy" is added.

Signed-off-by: Dongjin Kim <tobetter@xxxxxxxxx>
---
 .../devicetree/bindings/usb/samsung-usbphy.txt     |    5 ++
 drivers/usb/phy/phy-samsung-usb.c                  |   30 ++++++-
 drivers/usb/phy/phy-samsung-usb.h                  |   18 ++++
 drivers/usb/phy/phy-samsung-usb2.c                 |   90 ++++++++++++++++++++
 4 files changed, 140 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/usb/samsung-usbphy.txt b/Documentation/devicetree/bindings/usb/samsung-usbphy.txt
index 33fd354..f805878 100644
--- a/Documentation/devicetree/bindings/usb/samsung-usbphy.txt
+++ b/Documentation/devicetree/bindings/usb/samsung-usbphy.txt
@@ -18,6 +18,11 @@ Exynos4210:
 - clock-names: names of clock correseponding IDs clock property as requested
 	       by the controller driver.
 
+Exynos4x12:
+- compatible : should be "samsung,exynos4x12-usb2phy"
+- reg : base physical address of the phy registers and length of memory mapped
+	region.
+
 Exynos5250:
 - compatible : should be "samsung,exynos5250-usb2phy"
 - reg : base physical address of the phy registers and length of memory mapped
diff --git a/drivers/usb/phy/phy-samsung-usb.c b/drivers/usb/phy/phy-samsung-usb.c
index 7b118ee5..efb26de 100644
--- a/drivers/usb/phy/phy-samsung-usb.c
+++ b/drivers/usb/phy/phy-samsung-usb.c
@@ -91,10 +91,11 @@ void samsung_usbphy_set_isolation(struct samsung_usbphy *sphy, bool on)
 		 */
 		break;
 	case TYPE_EXYNOS4210:
+	case TYPE_EXYNOS4X12:
 		/*
-		 * Fall through since exynos4210 and exynos5250 have similar
-		 * register architecture: two separate registers for host and
-		 * device phy control with enable bit at position 0.
+		 * Fall through since exynos4210/4x12 and exynos5250 have
+		 * similar register architecture: two separateregistersfor
+		 * host and device phy control with enable bit at position 0.
 		 */
 	case TYPE_EXYNOS5250:
 		if (sphy->phy_type == USB_PHY_TYPE_DEVICE) {
@@ -210,6 +211,29 @@ int samsung_usbphy_get_refclk_freq(struct samsung_usbphy *sphy)
 			refclk_freq = FSEL_CLKSEL_24M;
 			break;
 		}
+	} else if (sphy->drv_data->cpu_type == TYPE_EXYNOS4X12) {
+		switch (clk_get_rate(ref_clk)) {
+		case 9600 * KHZ:
+			refclk_freq = FSEL_CLKSEL_9600K;
+			break;
+		case 10 * MHZ:
+			refclk_freq = FSEL_CLKSEL_10M;
+			break;
+		case 12 * MHZ:
+			refclk_freq = FSEL_CLKSEL_12M;
+			break;
+		case 19200 * KHZ:
+			refclk_freq = FSEL_CLKSEL_19200K;
+			break;
+		case 20 * MHZ:
+			refclk_freq = FSEL_CLKSEL_20M;
+			break;
+		case 24 * MHZ:
+		default:
+			/* default reference clock */
+			refclk_freq = FSEL_CLKSEL_24M;
+			break;
+		}
 	} else {
 		switch (clk_get_rate(ref_clk)) {
 		case 12 * MHZ:
diff --git a/drivers/usb/phy/phy-samsung-usb.h b/drivers/usb/phy/phy-samsung-usb.h
index 70a9cae..ad86bce 100644
--- a/drivers/usb/phy/phy-samsung-usb.h
+++ b/drivers/usb/phy/phy-samsung-usb.h
@@ -47,6 +47,23 @@
 #define RSTCON_HLINK_SWRST			(0x1 << 1)
 #define RSTCON_SWRST				(0x1 << 0)
 
+/* For Exynos4x12 */
+#define PHYCLK_COMMON_ON_N_PHY0			(0x1 << 4)
+#define PHYCLK_COMMON_ON_N_PHY1			(0x1 << 7)
+
+#define PHYPWR_NORMAL_MASK_HSIC1		(0x7 << 12)
+#define PHYPWR_NORMAL_MASK_HSIC0		(0x7 << 9)
+#define PHYPWR_NORMAL_MASK_PHY1			(0x7 << 6)
+
+#define PHYPWR_ANALOG_POWERDOWN_PHY1		(0x1 << 7)
+
+#define RSTCON_HLINK_SWRST_MASK			(0xf << 7)
+#define RSTCON_PHY1_SWRST_MASK			(0xf << 3)
+#define RSTCON_PHY0_SWRST_MASK			(0x7 << 0)
+
+#define EXYNOS4X12_PHY_HSIC_CTRL0		(0x04)
+#define EXYNOS4X12_PHY_HSIC_CTRL1		(0x08)
+
 /* EXYNOS5 */
 #define EXYNOS5_PHY_HOST_CTRL0			(0x00)
 
@@ -241,6 +258,7 @@
 enum samsung_cpu_type {
 	TYPE_S3C64XX,
 	TYPE_EXYNOS4210,
+	TYPE_EXYNOS4X12,
 	TYPE_EXYNOS5250,
 };
 
diff --git a/drivers/usb/phy/phy-samsung-usb2.c b/drivers/usb/phy/phy-samsung-usb2.c
index 45ffe03..b95d05d 100644
--- a/drivers/usb/phy/phy-samsung-usb2.c
+++ b/drivers/usb/phy/phy-samsung-usb2.c
@@ -158,6 +158,59 @@ static void samsung_exynos5_usb2phy_enable(struct samsung_usbphy *sphy)
 	writel(ohcictrl, regs + EXYNOS5_PHY_HOST_OHCICTRL);
 }
 
+static bool exynos4_phyhost_is_on(void *regs)
+{
+	u32 reg;
+
+	reg = readl(regs + SAMSUNG_PHYPWR);
+
+	return !(reg & PHYPWR_ANALOG_POWERDOWN_PHY1);
+}
+
+static void samsung_exynos4x12_usb2phy_enable(struct samsung_usbphy *sphy)
+{
+	void __iomem *regs = sphy->regs;
+	u32 phypwr;
+	u32 phyclk;
+	u32 rstcon;
+
+	/*
+	 * phy_usage helps in keeping usage count for phy
+	 * so that the first consumer enabling the phy is also
+	 * the last consumer to disable it.
+	 */
+
+	atomic_inc(&sphy->phy_usage);
+
+	if (exynos4_phyhost_is_on(regs)) {
+		dev_info(sphy->dev, "Already power on PHY\n");
+		return;
+	}
+
+	writel(EXYNOS_USBPHY_ENABLE, sphy->pmuregs + EXYNOS4X12_PHY_HSIC_CTRL0);
+	writel(EXYNOS_USBPHY_ENABLE, sphy->pmuregs + EXYNOS4X12_PHY_HSIC_CTRL1);
+
+	/* Common block configuration during suspend */
+	phyclk = sphy->ref_clk_freq
+		& ~(PHYCLK_COMMON_ON_N_PHY1);
+	writel(phyclk, regs + SAMSUNG_PHYCLK);
+
+	/* Enable normal mode of Host */
+	phypwr = readl(regs + SAMSUNG_PHYPWR);
+	phypwr &= ~(PHYPWR_NORMAL_MASK_HSIC0 | PHYPWR_NORMAL_MASK_HSIC1
+			| PHYPWR_NORMAL_MASK_PHY1);
+	writel(phypwr, regs + SAMSUNG_PHYPWR);
+
+	/* Reset both PHY and Link of Host */
+	rstcon = readl(regs + SAMSUNG_RSTCON)
+		| (RSTCON_HLINK_SWRST_MASK | RSTCON_PHY1_SWRST_MASK);
+	writel(rstcon, regs + SAMSUNG_RSTCON);
+	udelay(10);
+	rstcon &= ~(RSTCON_HLINK_SWRST_MASK | RSTCON_PHY1_SWRST_MASK);
+	writel(rstcon, regs + SAMSUNG_RSTCON);
+	udelay(80);
+}
+
 static void samsung_usb2phy_enable(struct samsung_usbphy *sphy)
 {
 	void __iomem *regs = sphy->regs;
@@ -228,6 +281,27 @@ static void samsung_exynos5_usb2phy_disable(struct samsung_usbphy *sphy)
 	writel(phyotg, regs + EXYNOS5_PHY_OTG_SYS);
 }
 
+static void samsung_exynos4x12_usb2phy_disable(struct samsung_usbphy *sphy)
+{
+	void __iomem *regs = sphy->regs;
+	u32 phypwr;
+
+	if (atomic_dec_return(&sphy->phy_usage) > 0) {
+		dev_info(sphy->dev, "still being used\n");
+		return;
+	}
+
+	/* unset to normal of Host and Device */
+	phypwr = readl(regs + SAMSUNG_PHYPWR)
+		| (PHYPWR_NORMAL_MASK_PHY1
+				| PHYPWR_NORMAL_MASK_HSIC1
+				| PHYPWR_NORMAL_MASK_HSIC0);
+	writel(phypwr, regs + SAMSUNG_PHYPWR);
+
+	writel(0, sphy->pmuregs + EXYNOS4X12_PHY_HSIC_CTRL0);
+	writel(0, sphy->pmuregs + EXYNOS4X12_PHY_HSIC_CTRL1);
+}
+
 static void samsung_usb2phy_disable(struct samsung_usbphy *sphy)
 {
 	void __iomem *regs = sphy->regs;
@@ -293,6 +367,8 @@ static int samsung_usb2phy_init(struct usb_phy *phy)
 	/* Initialize usb phy registers */
 	if (sphy->drv_data->cpu_type == TYPE_EXYNOS5250)
 		samsung_exynos5_usb2phy_enable(sphy);
+	else if (sphy->drv_data->cpu_type == TYPE_EXYNOS4X12)
+		samsung_exynos4x12_usb2phy_enable(sphy);
 	else
 		samsung_usb2phy_enable(sphy);
 
@@ -336,6 +412,8 @@ static void samsung_usb2phy_shutdown(struct usb_phy *phy)
 	/* De-initialize usb phy registers */
 	if (sphy->drv_data->cpu_type == TYPE_EXYNOS5250)
 		samsung_exynos5_usb2phy_disable(sphy);
+	if (sphy->drv_data->cpu_type == TYPE_EXYNOS4X12)
+		samsung_exynos4x12_usb2phy_disable(sphy);
 	else
 		samsung_usb2phy_disable(sphy);
 
@@ -451,6 +529,12 @@ static const struct samsung_usbphy_drvdata usb2phy_exynos4 = {
 	.hostphy_en_mask	= EXYNOS_USBPHY_ENABLE,
 };
 
+static const struct samsung_usbphy_drvdata usb2phy_exynos4x12 = {
+	.cpu_type		= TYPE_EXYNOS4X12,
+	.devphy_en_mask		= EXYNOS_USBPHY_ENABLE,
+	.hostphy_en_mask	= EXYNOS_USBPHY_ENABLE,
+};
+
 static struct samsung_usbphy_drvdata usb2phy_exynos5 = {
 	.cpu_type		= TYPE_EXYNOS5250,
 	.hostphy_en_mask	= EXYNOS_USBPHY_ENABLE,
@@ -466,6 +550,9 @@ static const struct of_device_id samsung_usbphy_dt_match[] = {
 		.compatible = "samsung,exynos4210-usb2phy",
 		.data = &usb2phy_exynos4,
 	}, {
+		.compatible = "samsung,exynos4x12-usb2phy",
+		.data = &usb2phy_exynos4x12,
+	}, {
 		.compatible = "samsung,exynos5250-usb2phy",
 		.data = &usb2phy_exynos5
 	},
@@ -482,6 +569,9 @@ static struct platform_device_id samsung_usbphy_driver_ids[] = {
 		.name		= "exynos4210-usb2phy",
 		.driver_data	= (unsigned long)&usb2phy_exynos4,
 	}, {
+		.name		= "exynos4x12-usb2phy",
+		.driver_data	= (unsigned long)&usb2phy_exynos4x12,
+	}, {
 		.name		= "exynos5250-usb2phy",
 		.driver_data	= (unsigned long)&usb2phy_exynos5,
 	},
-- 
1.7.9.5

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