[PATCH] usb: phy: samsung: adding usbphy for Exynos4X12
From: Dongjin Kim
Date: Mon May 13 2013 - 14:26:31 EST
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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/