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Date: Tue, 18 Dec 2012 17:13:49 +0200
From: Felipe Balbi <balbi@...com>
To: Vivek Gautam <gautam.vivek@...sung.com>
CC: <linux-usb@...r.kernel.org>, <devicetree-discuss@...ts.ozlabs.org>,
<linux-kernel@...r.kernel.org>,
<linux-samsung-soc@...r.kernel.org>, <gregkh@...uxfoundation.org>,
<balbi@...com>, <kgene.kim@...sung.com>,
<thomas.abraham@...aro.org>, <rob.herring@...xeda.com>,
<grant.likely@...retlab.ca>, <sylvester.nawrocki@...il.com>,
<av.tikhomirov@...sung.com>, <yulgon.kim@...sung.com>,
<kishon@...com>, <p.paneri@...sung.com>
Subject: Re: [PATCH] usb: phy: samsung: Add support for USB 3.0 phy for
exynos5250
On Tue, Dec 18, 2012 at 08:40:26PM +0530, Vivek Gautam wrote:
> Adding support for USB3.0 phy for dwc3 controller on
> exynos5250 SOC.
>
> Signed-off-by: Vivek Gautam <gautam.vivek@...sung.com>
> ---
> drivers/usb/phy/samsung-usbphy.c | 339 +++++++++++++++++++++++++++++++++++++-
let's make the phy names standard from now on and call this
phy-samsung.c :-)
> 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;
is this realy how your HW behaves ? USB2 and USB3 phys are a single HW
entity ? I kinda doubt that :-s
--
balbi
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