[PATCH] usb: phy: samsung: Add support for USB 3.0 phy for exynos5250
From: Vivek Gautam
Date: Tue Dec 18 2012 - 10:03:52 EST
Adding support for USB3.0 phy for dwc3 controller on
exynos5250 SOC.
Signed-off-by: Vivek Gautam <gautam.vivek@xxxxxxxxxxx>
---
drivers/usb/phy/samsung-usbphy.c | 339 +++++++++++++++++++++++++++++++++++++-
1 files changed, 337 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/phy/samsung-usbphy.c b/drivers/usb/phy/samsung-usbphy.c
index 621348a..246eb28 100644
--- a/drivers/usb/phy/samsung-usbphy.c
+++ b/drivers/usb/phy/samsung-usbphy.c
@@ -154,6 +154,86 @@
#define EXYNOS5_PHY_OTG_TUNE (0x40)
+/* EXYNOS5: USB 3.0 DRD */
+#define EXYNOS5_DRD_LINKSYSTEM (0x04)
+
+#define LINKSYSTEM_FLADJ_MASK (0x3f << 1)
+#define LINKSYSTEM_FLADJ(_x) ((_x) << 1)
+#define LINKSYSTEM_XHCI_VERSION_CONTROL (0x1 << 27)
+
+#define EXYNOS5_DRD_PHYUTMI (0x08)
+
+#define PHYUTMI_OTGDISABLE (0x1 << 6)
+#define PHYUTMI_FORCESUSPEND (0x1 << 1)
+#define PHYUTMI_FORCESLEEP (0x1 << 0)
+
+#define EXYNOS5_DRD_PHYPIPE (0x0c)
+
+#define EXYNOS5_DRD_PHYCLKRST (0x10)
+
+#define PHYCLKRST_SSC_REFCLKSEL_MASK (0xff << 23)
+#define PHYCLKRST_SSC_REFCLKSEL(_x) ((_x) << 23)
+
+#define PHYCLKRST_SSC_RANGE_MASK (0x03 << 21)
+#define PHYCLKRST_SSC_RANGE(_x) ((_x) << 21)
+
+#define PHYCLKRST_SSC_EN (0x1 << 20)
+#define PHYCLKRST_REF_SSP_EN (0x1 << 19)
+#define PHYCLKRST_REF_CLKDIV2 (0x1 << 18)
+
+#define PHYCLKRST_MPLL_MULTIPLIER_MASK (0x7f << 11)
+#define PHYCLKRST_MPLL_MULTIPLIER_100MHZ_REF (0x19 << 11)
+#define PHYCLKRST_MPLL_MULTIPLIER_50M_REF (0x02 << 11)
+#define PHYCLKRST_MPLL_MULTIPLIER_24MHZ_REF (0x68 << 11)
+#define PHYCLKRST_MPLL_MULTIPLIER_20MHZ_REF (0x7d << 11)
+#define PHYCLKRST_MPLL_MULTIPLIER_19200KHZ_REF (0x02 << 11)
+
+#define PHYCLKRST_FSEL_MASK (0x3f << 5)
+#define PHYCLKRST_FSEL(_x) ((_x) << 5)
+#define PHYCLKRST_FSEL_PAD_100MHZ (0x27 << 5)
+#define PHYCLKRST_FSEL_PAD_24MHZ (0x2a << 5)
+#define PHYCLKRST_FSEL_PAD_20MHZ (0x31 << 5)
+#define PHYCLKRST_FSEL_PAD_19_2MHZ (0x38 << 5)
+
+#define PHYCLKRST_RETENABLEN (0x1 << 4)
+
+#define PHYCLKRST_REFCLKSEL_MASK (0x03 << 2)
+#define PHYCLKRST_REFCLKSEL_PAD_REFCLK (0x2 << 2)
+#define PHYCLKRST_REFCLKSEL_EXT_REFCLK (0x3 << 2)
+
+#define PHYCLKRST_PORTRESET (0x1 << 1)
+#define PHYCLKRST_COMMONONN (0x1 << 0)
+
+#define EXYNOS5_DRD_PHYREG0 (0x14)
+#define EXYNOS5_DRD_PHYREG1 (0x18)
+
+#define EXYNOS5_DRD_PHYPARAM0 (0x1c)
+
+#define PHYPARAM0_REF_USE_PAD (0x1 << 31)
+#define PHYPARAM0_REF_LOSLEVEL_MASK (0x1f << 26)
+#define PHYPARAM0_REF_LOSLEVEL (0x9 << 26)
+
+#define EXYNOS5_DRD_PHYPARAM1 (0x20)
+
+#define PHYPARAM1_PCS_TXDEEMPH_MASK (0x1f << 0)
+#define PHYPARAM1_PCS_TXDEEMPH (0x1c)
+
+#define EXYNOS5_DRD_PHYTERM (0x24)
+
+#define EXYNOS5_DRD_PHYTEST (0x28)
+
+#define PHYTEST_POWERDOWN_SSP (0x1 << 3)
+#define PHYTEST_POWERDOWN_HSP (0x1 << 2)
+
+#define EXYNOS5_DRD_PHYADP (0x2c)
+
+#define EXYNOS5_DRD_PHYBATCHG (0x30)
+
+#define PHYBATCHG_UTMI_CLKSEL (0x1 << 2)
+
+#define EXYNOS5_DRD_PHYRESUME (0x34)
+#define EXYNOS5_DRD_LINKPORT (0x44)
+
#ifndef MHZ
#define MHZ (1000*1000)
#endif
@@ -164,6 +244,15 @@ enum samsung_cpu_type {
TYPE_EXYNOS5250,
};
+/* structure usb3 - usb3.0 phy trasceiver state
+ * @phy: transceiver structure for USB 3.0
+ * @regs_phy: usb 3.0 phy register memory base
+ */
+struct usb3 {
+ struct usb_phy phy;
+ void __iomem *regs_phy;
+};
+
/*
* struct samsung_usbphy - transceiver driver state
* @phy: transceiver structure
@@ -192,11 +281,15 @@ struct samsung_usbphy {
u32 en_mask;
int ref_clk_freq;
int cpu_type;
+ struct usb3 usb3phy;
+ int has_usb3;
enum samsung_usb_phy_type phy_type;
atomic_t host_usage;
};
#define phy_to_sphy(x) container_of((x), struct samsung_usbphy, phy)
+#define phy_to_usb3phy(x) container_of((x), struct usb3, phy);
+#define usb3phy_to_sphy(x) container_of((x), struct samsung_usbphy, usb3phy)
static int samsung_usbphy_parse_dt_param(struct samsung_usbphy *sphy)
{
@@ -394,6 +487,42 @@ static int samsung_usbphy_get_refclk_freq(struct samsung_usbphy *sphy)
return refclk_freq;
}
+/*
+ * Sets the phy clk as EXTREFCLK (XXTI) which is internal clock form clock core.
+ */
+static u32 exynos5_usb3phy_set_clock(struct samsung_usbphy *sphy)
+{
+ u32 reg;
+ u32 refclk;
+
+ refclk = sphy->ref_clk_freq;
+
+ reg = PHYCLKRST_REFCLKSEL_EXT_REFCLK |
+ PHYCLKRST_FSEL(refclk);
+
+ switch (refclk) {
+ case HOST_CTRL0_FSEL_CLKSEL_50M:
+ reg |= (PHYCLKRST_MPLL_MULTIPLIER_50M_REF |
+ PHYCLKRST_SSC_REFCLKSEL(0x00));
+ break;
+ case HOST_CTRL0_FSEL_CLKSEL_20M:
+ reg |= (PHYCLKRST_MPLL_MULTIPLIER_20MHZ_REF |
+ PHYCLKRST_SSC_REFCLKSEL(0x00));
+ break;
+ case HOST_CTRL0_FSEL_CLKSEL_19200K:
+ reg |= (PHYCLKRST_MPLL_MULTIPLIER_19200KHZ_REF |
+ PHYCLKRST_SSC_REFCLKSEL(0x88));
+ break;
+ case HOST_CTRL0_FSEL_CLKSEL_24M:
+ default:
+ reg |= (PHYCLKRST_MPLL_MULTIPLIER_24MHZ_REF |
+ PHYCLKRST_SSC_REFCLKSEL(0x88));
+ break;
+ }
+
+ return reg;
+}
+
static int exynos5_phyhost_is_on(void *regs)
{
u32 reg;
@@ -403,6 +532,78 @@ static int exynos5_phyhost_is_on(void *regs)
return !(reg & HOST_CTRL0_SIDDQ);
}
+static int samsung_exynos5_usb3phy_enable(struct samsung_usbphy *sphy)
+{
+ void __iomem *regs = sphy->usb3phy.regs_phy;
+ u32 phyparam0;
+ u32 phyparam1;
+ u32 linksystem;
+ u32 phybatchg;
+ u32 phytest;
+ u32 phyclkrst;
+
+ /* Reset USB 3.0 PHY */
+ writel(0x0, regs + EXYNOS5_DRD_PHYREG0);
+
+ phyparam0 = readl(regs + EXYNOS5_DRD_PHYPARAM0);
+ /* Select PHY CLK source */
+ phyparam0 &= ~PHYPARAM0_REF_USE_PAD;
+ /* Set Loss-of-Signal Detector sensitivity */
+ phyparam0 &= ~PHYPARAM0_REF_LOSLEVEL_MASK;
+ phyparam0 |= PHYPARAM0_REF_LOSLEVEL;
+ writel(phyparam0, regs + EXYNOS5_DRD_PHYPARAM0);
+
+ writel(0x0, regs + EXYNOS5_DRD_PHYRESUME);
+
+ /*
+ * Setting the Frame length Adj value[6:1] to default 0x20
+ * See xHCI 1.0 spec, 5.2.4
+ */
+ linksystem = LINKSYSTEM_XHCI_VERSION_CONTROL |
+ LINKSYSTEM_FLADJ(0x20);
+ writel(linksystem, regs + EXYNOS5_DRD_LINKSYSTEM);
+
+ phyparam1 = readl(regs + EXYNOS5_DRD_PHYPARAM1);
+ /* Set Tx De-Emphasis level */
+ phyparam1 &= ~PHYPARAM1_PCS_TXDEEMPH_MASK;
+ phyparam1 |= PHYPARAM1_PCS_TXDEEMPH;
+ writel(phyparam1, regs + EXYNOS5_DRD_PHYPARAM1);
+
+ phybatchg = readl(regs + EXYNOS5_DRD_PHYBATCHG);
+ phybatchg |= PHYBATCHG_UTMI_CLKSEL;
+ writel(phybatchg, regs + EXYNOS5_DRD_PHYBATCHG);
+
+ /* PHYTEST POWERDOWN Control */
+ phytest = readl(regs + EXYNOS5_DRD_PHYTEST);
+ phytest &= ~(PHYTEST_POWERDOWN_SSP |
+ PHYTEST_POWERDOWN_HSP);
+ writel(phytest, regs + EXYNOS5_DRD_PHYTEST);
+
+ /* UTMI Power Control */
+ writel(PHYUTMI_OTGDISABLE, regs + EXYNOS5_DRD_PHYUTMI);
+
+ phyclkrst = exynos5_usb3phy_set_clock(sphy);
+
+ phyclkrst |= PHYCLKRST_PORTRESET |
+ /* Digital power supply in normal operating mode */
+ PHYCLKRST_RETENABLEN |
+ /* Enable ref clock for SS function */
+ PHYCLKRST_REF_SSP_EN |
+ /* Enable spread spectrum */
+ PHYCLKRST_SSC_EN |
+ /* Power down HS Bias and PLL blocks in suspend mode */
+ PHYCLKRST_COMMONONN;
+
+ writel(phyclkrst, regs + EXYNOS5_DRD_PHYCLKRST);
+
+ udelay(10);
+
+ phyclkrst &= ~(PHYCLKRST_PORTRESET);
+ writel(phyclkrst, regs + EXYNOS5_DRD_PHYCLKRST);
+
+ return 0;
+}
+
static void samsung_exynos5_usbphy_enable(struct samsung_usbphy *sphy)
{
void __iomem *regs = sphy->regs;
@@ -541,6 +742,32 @@ static void samsung_usbphy_enable(struct samsung_usbphy *sphy)
writel(rstcon, regs + SAMSUNG_RSTCON);
}
+static void samsung_exynos5_usb3phy_disable(struct samsung_usbphy *sphy)
+{
+ u32 phyutmi;
+ u32 phyclkrst;
+ u32 phytest;
+ void __iomem *regs = sphy->usb3phy.regs_phy;
+
+ phyutmi = PHYUTMI_OTGDISABLE |
+ PHYUTMI_FORCESUSPEND |
+ PHYUTMI_FORCESLEEP;
+ writel(phyutmi, regs + EXYNOS5_DRD_PHYUTMI);
+
+ /* Resetting the PHYCLKRST enable bits to reduce leakage current */
+ phyclkrst = readl(regs + EXYNOS5_DRD_PHYCLKRST);
+ phyclkrst &= ~(PHYCLKRST_REF_SSP_EN |
+ PHYCLKRST_SSC_EN |
+ PHYCLKRST_COMMONONN);
+ writel(phyclkrst, regs + EXYNOS5_DRD_PHYCLKRST);
+
+ /* Control PHYTEST to remove leakage current */
+ phytest = readl(regs + EXYNOS5_DRD_PHYTEST);
+ phytest |= (PHYTEST_POWERDOWN_SSP |
+ PHYTEST_POWERDOWN_HSP);
+ writel(phytest, regs + EXYNOS5_DRD_PHYTEST);
+}
+
static void samsung_exynos5_usbphy_disable(struct samsung_usbphy *sphy)
{
void __iomem *regs = sphy->regs;
@@ -600,6 +827,78 @@ static void samsung_usbphy_disable(struct samsung_usbphy *sphy)
/*
* The function passed to the usb driver for phy initialization
*/
+static int samsung_usb3phy_init(struct usb_phy *phy)
+{
+ struct usb3 *usb3phy;
+ struct samsung_usbphy *sphy;
+ int ret = 0;
+
+ usb3phy = phy_to_usb3phy(phy);
+ sphy = usb3phy_to_sphy(usb3phy);
+
+ if (!sphy->has_usb3) {
+ dev_err(sphy->dev, "Not a valid cpu_type for USB 3.0\n");
+ return -ENODEV;
+ }
+
+ /* setting default phy-type for USB 3.0 */
+ samsung_usbphy_set_type(&sphy->usb3phy.phy, USB_PHY_TYPE_DEVICE);
+
+ /* Enable the phy clock */
+ ret = clk_prepare_enable(sphy->clk);
+ if (ret) {
+ dev_err(sphy->dev, "%s: clk_prepare_enable failed\n", __func__);
+ return ret;
+ }
+
+ /* Disable phy isolation */
+ samsung_usbphy_set_isolation(sphy, false, sphy->phy_type);
+
+ /* Initialize usb phy registers */
+ samsung_exynos5_usb3phy_enable(sphy);
+
+ /* Disable the phy clock */
+ clk_disable_unprepare(sphy->clk);
+
+ return ret;
+}
+
+/*
+ * The function passed to the usb driver for phy shutdown
+ */
+static void samsung_usb3phy_shutdown(struct usb_phy *phy)
+{
+ struct usb3 *usb3phy;
+ struct samsung_usbphy *sphy;
+
+ usb3phy = phy_to_usb3phy(phy);
+ sphy = usb3phy_to_sphy(usb3phy);
+
+ if (!sphy->has_usb3) {
+ dev_err(sphy->dev, "Not a valid cpu_type for USB 3.0\n");
+ return;
+ }
+
+ /* setting default phy-type for USB 3.0 */
+ samsung_usbphy_set_type(&sphy->usb3phy.phy, USB_PHY_TYPE_DEVICE);
+
+ if (clk_prepare_enable(sphy->clk)) {
+ dev_err(sphy->dev, "%s: clk_prepare_enable failed\n", __func__);
+ return;
+ }
+
+ /* De-initialize usb phy registers */
+ samsung_exynos5_usb3phy_disable(sphy);
+
+ /* Enable phy isolation */
+ samsung_usbphy_set_isolation(sphy, true, sphy->phy_type);
+
+ clk_disable_unprepare(sphy->clk);
+}
+
+/*
+ * The function passed to the usb driver for phy initialization
+ */
static int samsung_usbphy_init(struct usb_phy *phy)
{
struct samsung_usbphy *sphy;
@@ -682,7 +981,7 @@ static int __devinit samsung_usbphy_probe(struct platform_device *pdev)
struct resource *phy_mem;
void __iomem *phy_base;
struct clk *clk;
- int ret;
+ int ret = 0;
phy_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!phy_mem) {
@@ -736,7 +1035,41 @@ static int __devinit samsung_usbphy_probe(struct platform_device *pdev)
sphy->clk = clk;
- return usb_add_phy(&sphy->phy, USB_PHY_TYPE_USB2);
+ sphy->has_usb3 = (sphy->cpu_type == TYPE_EXYNOS5250);
+
+ if (sphy->has_usb3) {
+ struct resource *usb3phy_mem;
+ void __iomem *usb3phy_base;
+
+ usb3phy_mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ if (!usb3phy_mem) {
+ dev_err(dev, "%s: missing mem resource\n", __func__);
+ return -ENODEV;
+ }
+
+ usb3phy_base = devm_request_and_ioremap(dev, usb3phy_mem);
+ if (!usb3phy_base) {
+ dev_err(dev, "%s: register mapping failed\n", __func__);
+ return -ENXIO;
+ }
+
+ sphy->usb3phy.regs_phy = usb3phy_base;
+ sphy->usb3phy.phy.dev = sphy->dev;
+ sphy->usb3phy.phy.label = "samsung-usb3phy";
+ sphy->usb3phy.phy.init = samsung_usb3phy_init;
+ sphy->usb3phy.phy.shutdown = samsung_usb3phy_shutdown;
+ }
+
+ ret = usb_add_phy(&sphy->phy, USB_PHY_TYPE_USB2);
+ if (ret)
+ return ret;
+
+ if (sphy->has_usb3)
+ ret = usb_add_phy(&sphy->usb3phy.phy, USB_PHY_TYPE_USB3);
+ else
+ dev_warn(dev, "Not a valid cpu_type for USB 3.0\n");
+
+ return ret;
}
static int __exit samsung_usbphy_remove(struct platform_device *pdev)
@@ -744,6 +1077,8 @@ static int __exit samsung_usbphy_remove(struct platform_device *pdev)
struct samsung_usbphy *sphy = platform_get_drvdata(pdev);
usb_remove_phy(&sphy->phy);
+ if (sphy->has_usb3)
+ usb_remove_phy(&sphy->usb3phy.phy);
if (sphy->devctrl_reg)
iounmap(sphy->devctrl_reg);
--
1.7.6.5
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