Hi,
I have a few comments. Please see below...
On 11/06/2012 04:36 PM, Vivek Gautam wrote:
Adding support for USB3.0 phy for dwc3 controller on
exynso5250 SOC.
exynso -> exynos
Signed-off-by: Vivek Gautam<gautam.vivek@xxxxxxxxxxx>
---
drivers/usb/phy/samsung-usbphy.c | 337 +++++++++++++++++++++++++++++++++++
include/linux/usb/samsung_usb_phy.h | 1 +
2 files changed, 338 insertions(+), 0 deletions(-)
diff --git a/drivers/usb/phy/samsung-usbphy.c b/drivers/usb/phy/samsung-usbphy.c
index 3b4863d..e3b5fb1 100644
--- a/drivers/usb/phy/samsung-usbphy.c
+++ b/drivers/usb/phy/samsung-usbphy.c
@@ -167,6 +167,99 @@
#define EXYNOS5_PHY_OTG_TUNE (0x40)
+/* 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 (1<< 27)
+
+#define EXYNOS5_DRD_PHYUTMI (0x08)
+
+#define PHYUTMI_OTGDISABLE (1<< 6)
+#define PHYUTMI_FORCESUSPEND (1<< 1)
+#define PHYUTMI_FORCESLEEP (1<< 0)
+
+#define EXYNOS5_DRD_PHYPIPE (0x0C)
Would be nice to put all hex numbers in lower case.
+
+#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 (1<< 20)
+#define PHYCLKRST_REF_SSP_EN (1<< 19)
+#define PHYCLKRST_REF_CLKDIV2 (1<< 18)
+
+#define PHYCLKRST_MPLL_MULTIPLIER_MASK (0x7f<< 11)
+#define PHYCLKRST_MPLL_MULTIPLIER(_x) ((_x)<< 11)
Is this macro-definition going to be used anywhere else except the
5 definitions below ? Is this really helpful ? In anything else than
forcing you to use questionable line breaking below ?
+#define PHYCLKRST_MPLL_MULTIPLIER_100MHZ_REF \
How about simply defining it as
#define PHYCLKRST_MPLL_MULTIPLIER_100MHZ_REF (0x19 << 11)
?
+ PHYCLKRST_MPLL_MULTIPLIER(0x19)
+#define PHYCLKRST_MPLL_MULTIPLIER_50M_REF \
+ PHYCLKRST_MPLL_MULTIPLIER(0x02)
+#define PHYCLKRST_MPLL_MULTIPLIER_24MHZ_REF \
+ PHYCLKRST_MPLL_MULTIPLIER(0x68)
+#define PHYCLKRST_MPLL_MULTIPLIER_20MHZ_REF \
+ PHYCLKRST_MPLL_MULTIPLIER(0x7d)
+#define PHYCLKRST_MPLL_MULTIPLIER_19200KHZ_REF \
+ PHYCLKRST_MPLL_MULTIPLIER(0x02)
+
+#define PHYCLKRST_FSEL_MASK (0x3f<< 5)
+#define PHYCLKRST_FSEL(_x) ((_x)<< 5)
Ditto.
+#define PHYCLKRST_FSEL_PAD_100MHZ \
+ PHYCLKRST_FSEL(0x27)
+#define PHYCLKRST_FSEL_PAD_24MHZ \
+ PHYCLKRST_FSEL(0x2a)
+#define PHYCLKRST_FSEL_PAD_20MHZ \
+ PHYCLKRST_FSEL(0x31)
+#define PHYCLKRST_FSEL_PAD_19_2MHZ \
+ PHYCLKRST_FSEL(0x38)
+
+#define PHYCLKRST_RETENABLEN (1<< 4)
+
+#define PHYCLKRST_REFCLKSEL_MASK (0x03<< 2)
+#define PHYCLKRST_REFCLKSEL(_x) ((_x)<< 2)
Ditto.
+#define PHYCLKRST_REFCLKSEL_PAD_REFCLK \
+ PHYCLKRST_REFCLKSEL(2)
+#define PHYCLKRST_REFCLKSEL_EXT_REFCLK \
+ PHYCLKRST_REFCLKSEL(3)
+
+#define PHYCLKRST_PORTRESET (1<< 1)
+#define PHYCLKRST_COMMONONN (1<< 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 (1<< 3)
+#define PHYTEST_POWERDOWN_HSP (1<< 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
@@ -180,10 +273,12 @@ enum samsung_cpu_type {
/*
* struct samsung_usbphy - transceiver driver state
* @phy: transceiver structure
+ * @phy3: transceiver structure for USB 3.0
* @plat: platform data
* @dev: The parent device supplied to the probe function
* @clk: usb phy clock
* @regs: usb phy register memory base
+ * @regs_phy3: usb 3.0 phy register memory base
* @ref_clk_freq: reference clock frequency selection
* @cpu_type: machine identifier
* @phy_type: It keeps track of the PHY type.
@@ -191,10 +286,12 @@ enum samsung_cpu_type {
*/
struct samsung_usbphy {
struct usb_phy phy;
+ struct usb_phy phy3;
struct samsung_usbphy_data *plat;
struct device *dev;
struct clk *clk;
void __iomem *regs;
+ void __iomem *regs_phy3;
Wouldn't it be better to create a new data structure for USB 3.0
and embedding it here, rather than adding multiple fields with "3"
suffix ? E.g.
struct {
void __iomem *phy_regs;
struct usb_phy phy;
} usb3;
?
And why do you need to duplicate those fields in first place ?
I guess phy and phy3 are dependant and you can't register 2 PHYs
separately ?
int ref_clk_freq;
int cpu_type;
enum samsung_usb_phy_type phy_type;
@@ -202,6 +299,7 @@ struct samsung_usbphy {
};
#define phy_to_sphy(x) container_of((x), struct samsung_usbphy, phy)
+#define phy3_to_sphy(x) container_of((x), struct samsung_usbphy, phy3)
/*
* PHYs are different for USB Device and USB Host. Controllers can make
@@ -287,12 +385,120 @@ 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_usbphy3_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)
{
return (readl(regs + EXYNOS5_PHY_HOST_CTRL0)&
HOST_CTRL0_SIDDQ) ? 0 : 1;
Just do:
return !(readl(regs + EXYNOS5_PHY_HOST_CTRL0) & HOST_CTRL0_SIDDQ);
or:
u32 reg = readl(regs + EXYNOS5_PHY_HOST_CTRL0);
return !(reg & HOST_CTRL0_SIDDQ);
}
+static int samsung_exynos5_usbphy3_enable(struct samsung_usbphy *sphy)
+{
+ void __iomem *regs = sphy->regs_phy3;
+ 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_usbphy3_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);
usleep_range() ?
+
+ 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;
@@ -432,6 +638,32 @@ static void samsung_usbphy_enable(struct samsung_usbphy *sphy)
writel(rstcon, regs + SAMSUNG_RSTCON);
}
+static void samsung_exynos5_usbphy3_disable(struct samsung_usbphy *sphy)
+{
+ u32 phyutmi;
+ u32 phyclkrst;
+ u32 phytest;
+ void __iomem *regs = sphy->regs_phy3;
+
+ 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;
@@ -491,6 +723,76 @@ static void samsung_usbphy_disable(struct samsung_usbphy *sphy)
/*
* The function passed to the usb driver for phy initialization
*/
+static int samsung_usbphy3_init(struct usb_phy *phy3)
+{
+ struct samsung_usbphy *sphy;
+ int ret = 0;
+
+ sphy = phy3_to_sphy(phy3);
+
+ if (sphy->cpu_type != TYPE_EXYNOS5250) {
+ 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->phy3, USB_PHY_TYPE_DRD);
+
+ /* 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 */
+ if (sphy->plat&& sphy->plat->pmu_isolation)
+ sphy->plat->pmu_isolation(false, sphy->phy_type);
+
+ /* Initialize usb phy registers */
+ samsung_exynos5_usbphy3_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_usbphy3_shutdown(struct usb_phy *phy3)
+{
+ struct samsung_usbphy *sphy;
+
+ sphy = phy3_to_sphy(phy3);
This assignment could be done at the declaration time above.
+
+ if (sphy->cpu_type != TYPE_EXYNOS5250) {
How about adding some flag to struct samsung_usbphy telling whether PHY 3.0
is used or not, rather than having checks for all future cpu types all
over in this driver ?
+ 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->phy3, USB_PHY_TYPE_DRD);
+
+ 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_usbphy3_disable(sphy);
+
+ /* Enable phy isolation */
+ if (sphy->plat&& sphy->plat->pmu_isolation)
+ sphy->plat->pmu_isolation(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;
@@ -570,6 +872,8 @@ static int __devinit samsung_usbphy_probe(struct platform_device *pdev)
struct device *dev =&pdev->dev;
struct resource *phy_mem;
void __iomem *phy_base;
+ struct resource *phy3_mem;
+ void __iomem *phy3_base = NULL;
struct clk *clk;
int ret = 0;
@@ -618,7 +922,38 @@ static int __devinit samsung_usbphy_probe(struct platform_device *pdev)
sphy->clk = clk;
+ if (sphy->cpu_type == TYPE_EXYNOS5250) {
+ phy3_mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ if (!phy3_mem) {
+ dev_err(dev, "%s: missing mem resource\n", __func__);
+ return -ENODEV;
+ }
+
+ phy3_base = devm_request_and_ioremap(dev, phy3_mem);
+ if (!phy3_base) {
+ dev_err(dev, "%s: register mapping failed\n", __func__);
+ return -ENXIO;
+ }
+ }
+
+ sphy->regs_phy3 = phy3_base;
+ sphy->phy3.dev = sphy->dev;
+ sphy->phy3.label = "samsung-usbphy3";
+ sphy->phy3.init = samsung_usbphy3_init;
+ sphy->phy3.shutdown = samsung_usbphy3_shutdown;
+
ret = usb_add_phy(&sphy->phy, USB_PHY_TYPE_USB2);
+ if (ret)
+ return ret;
+
+ if (sphy->cpu_type != TYPE_EXYNOS5250) {
+ dev_warn(dev, "Not a valid cpu_type for USB 3.0\n");
+ } else {
+ ret = usb_add_phy(&sphy->phy3, USB_PHY_TYPE_USB3);
+ if (ret)
+ return ret;
2 redundant lines here.
+ }
The above code looks completely out of order. What's the point of
initialising
sphy->phy3 and then not using it when sphy->cpu_type != TYPE_EXYNOS5250 ?
+
return ret;
}
@@ -627,6 +962,8 @@ 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->cpu_type == TYPE_EXYNOS5250)
+ usb_remove_phy(&sphy->phy3);
return 0;
}
diff --git a/include/linux/usb/samsung_usb_phy.h b/include/linux/usb/samsung_usb_phy.h
index 8c05462..ed6f6c4 100644
--- a/include/linux/usb/samsung_usb_phy.h
+++ b/include/linux/usb/samsung_usb_phy.h
@@ -16,6 +16,7 @@ enum samsung_usb_phy_type
{
USB_PHY_TYPE_DEVICE,
USB_PHY_TYPE_HOST,
+ USB_PHY_TYPE_DRD,
};
#ifdef CONFIG_SAMSUNG_USBPHY
Thanks,
Sylwester
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