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SubjectRe: [PATCH 1/2] usb: phy: Add USB host phy support on Exyno4412
From
Hi,

On Tue, Feb 5, 2013 at 6:55 AM, Dongjin Kim <tobetter@gmail.com> wrote:
> This patch adds host phy support for Samsung's Exynos4412 SoC to
> samsung-usbphy driver. This patch is created upon "http://git.kernel.org/?p=linux/kernel/git/balbi/usb.git;a=commit;h=2564b526b8cf01e6c36285edfd40a438e683c2b8"
>
> Cc: Praveen Paneri <p.paneri@samsung.com>
> Signed-off-by: Dongjin Kim <tobetter@gmail.com>
> ---
> drivers/usb/phy/samsung-usbphy.c | 156 +++++++++++++++++++++++++++++++++++++-
> 1 file changed, 154 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/usb/phy/samsung-usbphy.c b/drivers/usb/phy/samsung-usbphy.c
> index 6ea5537..c800fa4 100644
> --- a/drivers/usb/phy/samsung-usbphy.c
> +++ b/drivers/usb/phy/samsung-usbphy.c
> @@ -47,7 +47,7 @@
>
> #define PHYCLK_MODE_USB11 (0x1 << 6)
> #define PHYCLK_EXT_OSC (0x1 << 5)
> -#define PHYCLK_COMMON_ON_N (0x1 << 4)
> +#define PHYCLK_COMMON_ON_N_PHY0 (0x1 << 4)
> #define PHYCLK_ID_PULL (0x1 << 2)
> #define PHYCLK_CLKSEL_MASK (0x3 << 0)
> #define PHYCLK_CLKSEL_48M (0x0 << 0)
> @@ -60,6 +60,22 @@
> #define RSTCON_HLINK_SWRST (0x1 << 1)
> #define RSTCON_SWRST (0x1 << 0)
>
> +/* For Exynos4412 */
> +#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 EXYNOS4_PHY_HSIC_CTRL0 (0x04)
> +#define EXYNOS4_PHY_HSIC_CTRL1 (0x08)
> +
> /* EXYNOS5 */
> #define EXYNOS5_PHY_HOST_CTRL0 (0x00)
>
> @@ -174,6 +190,7 @@
> enum samsung_cpu_type {
> TYPE_S3C64XX,
> TYPE_EXYNOS4210,
> + TYPE_EXYNOS4412,
Shouldn't you add it under the TYPE_EXYNOS4X12. We will have to add a
separate support for 4212 then.
> TYPE_EXYNOS5250,
> };
>
> @@ -322,6 +339,17 @@ static void samsung_usbphy_set_isolation(struct samsung_usbphy *sphy, bool on)
> en_mask = sphy->drv_data->hostphy_en_mask;
> }
> break;
> + case TYPE_EXYNOS4412:
> + if (sphy->phy_type == USB_PHY_TYPE_DEVICE) {
> + reg = sphy->pmuregs +
> + sphy->drv_data->devphy_reg_offset;
> + en_mask = sphy->drv_data->devphy_en_mask;
> + } else if (sphy->phy_type == USB_PHY_TYPE_HOST) {
> + reg = sphy->pmuregs +
> + sphy->drv_data->hostphy_reg_offset;
> + en_mask = sphy->drv_data->hostphy_en_mask;
> + }
> + break;
> default:
> dev_err(sphy->dev, "Invalid SoC type\n");
> return;
> @@ -422,6 +450,29 @@ static int samsung_usbphy_get_refclk_freq(struct samsung_usbphy *sphy)
> refclk_freq = FSEL_CLKSEL_24M;
> break;
> }
> + } else if (sphy->drv_data->cpu_type == TYPE_EXYNOS4412) {
> + 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:
> @@ -561,6 +612,69 @@ static void samsung_exynos5_usbphy_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_exynos4412_usbphy_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 + EXYNOS4_PHY_HSIC_CTRL0);
> + writel(EXYNOS_USBPHY_ENABLE, sphy->pmuregs + EXYNOS4_PHY_HSIC_CTRL1);
> +
> + /* Common block configuration during suspend */
> + phyclk = sphy->ref_clk_freq
> + & ~(PHYCLK_COMMON_ON_N_PHY0 | PHYCLK_COMMON_ON_N_PHY1);
Why PHY0 here? Shouldn't it come with the support for device phy?
> + writel(phyclk, regs + SAMSUNG_PHYCLK);
> +
> + /* set to normal of Device */
Please edit this comment for better readability. See the existing code.
> + phypwr = readl(regs + SAMSUNG_PHYPWR) & ~PHYPWR_NORMAL_MASK_PHY0;
> + writel(phypwr, regs + SAMSUNG_PHYPWR);
> +
> + /* set to normal of Host */
Here as well
> + phypwr &= ~(PHYPWR_NORMAL_MASK_HSIC0 | PHYPWR_NORMAL_MASK_HSIC1
> + | PHYPWR_NORMAL_MASK_PHY1);
> + writel(phypwr, regs + SAMSUNG_PHYPWR);
> +
> + /* reset both PHY and Link of Device */
> + rstcon = readl(regs + SAMSUNG_RSTCON) | RSTCON_PHY0_SWRST_MASK;
> + writel(rstcon, regs + SAMSUNG_RSTCON);
> + udelay(10);
> + rstcon &= ~RSTCON_PHY0_SWRST_MASK;
> + writel(rstcon, regs + SAMSUNG_RSTCON);
Do we really need to reset PHY0 too? As long as PHY0 is not required.
> +
> + /* 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_usbphy_enable(struct samsung_usbphy *sphy)
> {
> void __iomem *regs = sphy->regs;
> @@ -575,7 +689,7 @@ static void samsung_usbphy_enable(struct samsung_usbphy *sphy)
>
> switch (sphy->drv_data->cpu_type) {
> case TYPE_S3C64XX:
> - phyclk &= ~PHYCLK_COMMON_ON_N;
> + phyclk &= ~PHYCLK_COMMON_ON_N_PHY0;
> phypwr &= ~PHYPWR_NORMAL_MASK;
> rstcon |= RSTCON_SWRST;
> break;
> @@ -631,6 +745,28 @@ static void samsung_exynos5_usbphy_disable(struct samsung_usbphy *sphy)
> writel(phyotg, regs + EXYNOS5_PHY_OTG_SYS);
> }
>
> +static void samsung_exynos4412_usbphy_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 |= (PHYPWR_NORMAL_MASK_HSIC0
> + | PHYPWR_NORMAL_MASK_HSIC1
> + | PHYPWR_NORMAL_MASK_PHY1
> + | PHYPWR_NORMAL_MASK_PHY0);
PHY0?
> + writel(phypwr, regs + SAMSUNG_PHYPWR);
> +
> + writel(0, sphy->pmuregs + EXYNOS4_PHY_HSIC_CTRL0);
> + writel(0, sphy->pmuregs + EXYNOS4_PHY_HSIC_CTRL1);
> +}
> +
> static void samsung_usbphy_disable(struct samsung_usbphy *sphy)
> {
> void __iomem *regs = sphy->regs;
> @@ -696,6 +832,8 @@ static int samsung_usbphy_init(struct usb_phy *phy)
> /* Initialize usb phy registers */
> if (sphy->drv_data->cpu_type == TYPE_EXYNOS5250)
> samsung_exynos5_usbphy_enable(sphy);
> + else if (sphy->drv_data->cpu_type == TYPE_EXYNOS4412)
> + samsung_exynos4412_usbphy_enable(sphy);
> else
> samsung_usbphy_enable(sphy);
>
> @@ -739,6 +877,8 @@ static void samsung_usbphy_shutdown(struct usb_phy *phy)
> /* De-initialize usb phy registers */
> if (sphy->drv_data->cpu_type == TYPE_EXYNOS5250)
> samsung_exynos5_usbphy_disable(sphy);
> + else if (sphy->drv_data->cpu_type == TYPE_EXYNOS4412)
> + samsung_exynos4412_usbphy_disable(sphy);
> else
> samsung_usbphy_disable(sphy);
>
> @@ -872,6 +1012,12 @@ static const struct samsung_usbphy_drvdata usbphy_exynos4 = {
> .hostphy_en_mask = EXYNOS_USBPHY_ENABLE,
> };
>
> +static const struct samsung_usbphy_drvdata usbphy_exynos4412 = {
> + .cpu_type = TYPE_EXYNOS4412,
> + .devphy_en_mask = EXYNOS_USBPHY_ENABLE,
> + .hostphy_en_mask = EXYNOS_USBPHY_ENABLE,
> +};
> +
> static struct samsung_usbphy_drvdata usbphy_exynos5 = {
> .cpu_type = TYPE_EXYNOS5250,
> .hostphy_en_mask = EXYNOS_USBPHY_ENABLE,
> @@ -887,6 +1033,9 @@ static const struct of_device_id samsung_usbphy_dt_match[] = {
> .compatible = "samsung,exynos4210-usbphy",
> .data = &usbphy_exynos4,
> }, {
> + .compatible = "samsung,exynos4412-usbphy",
> + .data = &usbphy_exynos4412,
> + }, {
> .compatible = "samsung,exynos5250-usbphy",
> .data = &usbphy_exynos5
> },
> @@ -903,6 +1052,9 @@ static struct platform_device_id samsung_usbphy_driver_ids[] = {
> .name = "exynos4210-usbphy",
> .driver_data = (unsigned long)&usbphy_exynos4,
> }, {
> + .name = "exynos4412-usbphy",
> + .driver_data = (unsigned long)&usbphy_exynos4412,
> + }, {
> .name = "exynos5250-usbphy",
> .driver_data = (unsigned long)&usbphy_exynos5,
> },
> --
> 1.7.10.4
I am not sure if you were following this.
http://permalink.gmane.org/gmane.linux.kernel.samsung-soc/15296

Tomasz,

Would you like to add something here?

regards,
Praveen
>
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