Re: [PATCH] usb: phy: samsung: Add support for USB 3.0 phy for exynos5250

From: Vivek Gautam
Date: Wed Dec 19 2012 - 01:29:09 EST

Hi Felipe,


On Wed, Dec 19, 2012 at 11:14 AM, Vivek Gautam
<gautamvivek1987@xxxxxxxxx> wrote:
> CC: Doug Anderson
>
>
> On Tue, Dec 18, 2012 at 8:43 PM, Felipe Balbi <balbi@xxxxxx> wrote:
>> 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@xxxxxxxxxxx>
>>> ---
>>> 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
>>

They are separate HW in fact.
So, do you expect to see a separate driver interface for USB 3.0 type phy ?
That will be quite similar architecturally to current samsung-usbphy
driver for USB 2.0 type phy,
and may require some code duplication too.

>> --
>> balbi
>
>


--
Thanks & Regards
Vivek
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