Re: [PATCH] usb: phy: samsung: adding usbphy for Exynos4X12

From: Vivek Gautam
Date: Mon May 13 2013 - 15:40:42 EST

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In reply to: Dongjin Kim: "[PATCH] usb: phy: samsung: adding usbphy for Exynos4X12"
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Hi Dongjin,

On Mon, May 13, 2013 at 11:55 PM, Dongjin Kim <tobetter@xxxxxxxxx> wrote:
> This patch adds usb host phy (USB 2.0 PHY) support for Samsung Exynos4X12 SoC.
> New functions, samsung_exynos4x12_usb2phy_enable/_disable and selecting
> reference clock, for Exynos4X12 are added. Since it has different register
> set up with Exynos4210 or Exynos5250, "samsung,exynos4x12-usb2phy" is added.

A patch-set for 4x12 from Tomasz too.
[PATCH 0/6] Samsung USB PHY SoC support cleanup
@ http://www.mail-archive.com/linux-usb@xxxxxxxxxxxxxxx/msg18177.html

Hi Tomasz,

Planning to re-spin that series ?

>
> Signed-off-by: Dongjin Kim <tobetter@xxxxxxxxx>
> ---
> .../devicetree/bindings/usb/samsung-usbphy.txt | 5 ++
> drivers/usb/phy/phy-samsung-usb.c | 30 ++++++-
> drivers/usb/phy/phy-samsung-usb.h | 18 ++++
> drivers/usb/phy/phy-samsung-usb2.c | 90 ++++++++++++++++++++
> 4 files changed, 140 insertions(+), 3 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/usb/samsung-usbphy.txt b/Documentation/devicetree/bindings/usb/samsung-usbphy.txt
> index 33fd354..f805878 100644
> --- a/Documentation/devicetree/bindings/usb/samsung-usbphy.txt
> +++ b/Documentation/devicetree/bindings/usb/samsung-usbphy.txt
> @@ -18,6 +18,11 @@ Exynos4210:
> - clock-names: names of clock correseponding IDs clock property as requested
> by the controller driver.
>
> +Exynos4x12:
> +- compatible : should be "samsung,exynos4x12-usb2phy"
> +- reg : base physical address of the phy registers and length of memory mapped
> + region.
> +
> Exynos5250:
> - compatible : should be "samsung,exynos5250-usb2phy"
> - reg : base physical address of the phy registers and length of memory mapped
> diff --git a/drivers/usb/phy/phy-samsung-usb.c b/drivers/usb/phy/phy-samsung-usb.c
> index 7b118ee5..efb26de 100644
> --- a/drivers/usb/phy/phy-samsung-usb.c
> +++ b/drivers/usb/phy/phy-samsung-usb.c
> @@ -91,10 +91,11 @@ void samsung_usbphy_set_isolation(struct samsung_usbphy *sphy, bool on)
> */
> break;
> case TYPE_EXYNOS4210:
> + case TYPE_EXYNOS4X12:
> /*
> - * Fall through since exynos4210 and exynos5250 have similar
> - * register architecture: two separate registers for host and
> - * device phy control with enable bit at position 0.
> + * Fall through since exynos4210/4x12 and exynos5250 have
> + * similar register architecture: two separateregistersfor
> + * host and device phy control with enable bit at position 0.
> */
> case TYPE_EXYNOS5250:
> if (sphy->phy_type == USB_PHY_TYPE_DEVICE) {
> @@ -210,6 +211,29 @@ int samsung_usbphy_get_refclk_freq(struct samsung_usbphy *sphy)
> refclk_freq = FSEL_CLKSEL_24M;
> break;
> }
> + } else if (sphy->drv_data->cpu_type == TYPE_EXYNOS4X12) {
> + 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:
> diff --git a/drivers/usb/phy/phy-samsung-usb.h b/drivers/usb/phy/phy-samsung-usb.h
> index 70a9cae..ad86bce 100644
> --- a/drivers/usb/phy/phy-samsung-usb.h
> +++ b/drivers/usb/phy/phy-samsung-usb.h
> @@ -47,6 +47,23 @@
> #define RSTCON_HLINK_SWRST (0x1 << 1)
> #define RSTCON_SWRST (0x1 << 0)
>
> +/* For Exynos4x12 */
> +#define PHYCLK_COMMON_ON_N_PHY0 (0x1 << 4)
> +#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 EXYNOS4X12_PHY_HSIC_CTRL0 (0x04)
> +#define EXYNOS4X12_PHY_HSIC_CTRL1 (0x08)
> +
> /* EXYNOS5 */
> #define EXYNOS5_PHY_HOST_CTRL0 (0x00)
>
> @@ -241,6 +258,7 @@
> enum samsung_cpu_type {
> TYPE_S3C64XX,
> TYPE_EXYNOS4210,
> + TYPE_EXYNOS4X12,
> TYPE_EXYNOS5250,
> };
>
> diff --git a/drivers/usb/phy/phy-samsung-usb2.c b/drivers/usb/phy/phy-samsung-usb2.c
> index 45ffe03..b95d05d 100644
> --- a/drivers/usb/phy/phy-samsung-usb2.c
> +++ b/drivers/usb/phy/phy-samsung-usb2.c
> @@ -158,6 +158,59 @@ static void samsung_exynos5_usb2phy_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_exynos4x12_usb2phy_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 + EXYNOS4X12_PHY_HSIC_CTRL0);
> + writel(EXYNOS_USBPHY_ENABLE, sphy->pmuregs + EXYNOS4X12_PHY_HSIC_CTRL1);
> +
> + /* Common block configuration during suspend */
> + phyclk = sphy->ref_clk_freq
> + & ~(PHYCLK_COMMON_ON_N_PHY1);
> + writel(phyclk, regs + SAMSUNG_PHYCLK);
> +
> + /* Enable normal mode of Host */
> + phypwr = readl(regs + SAMSUNG_PHYPWR);
> + phypwr &= ~(PHYPWR_NORMAL_MASK_HSIC0 | PHYPWR_NORMAL_MASK_HSIC1
> + | PHYPWR_NORMAL_MASK_PHY1);
> + writel(phypwr, regs + SAMSUNG_PHYPWR);
> +
> + /* 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_usb2phy_enable(struct samsung_usbphy *sphy)
> {
> void __iomem *regs = sphy->regs;
> @@ -228,6 +281,27 @@ static void samsung_exynos5_usb2phy_disable(struct samsung_usbphy *sphy)
> writel(phyotg, regs + EXYNOS5_PHY_OTG_SYS);
> }
>
> +static void samsung_exynos4x12_usb2phy_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_NORMAL_MASK_PHY1
> + | PHYPWR_NORMAL_MASK_HSIC1
> + | PHYPWR_NORMAL_MASK_HSIC0);
> + writel(phypwr, regs + SAMSUNG_PHYPWR);
> +
> + writel(0, sphy->pmuregs + EXYNOS4X12_PHY_HSIC_CTRL0);
> + writel(0, sphy->pmuregs + EXYNOS4X12_PHY_HSIC_CTRL1);
> +}
> +
> static void samsung_usb2phy_disable(struct samsung_usbphy *sphy)
> {
> void __iomem *regs = sphy->regs;
> @@ -293,6 +367,8 @@ static int samsung_usb2phy_init(struct usb_phy *phy)
> /* Initialize usb phy registers */
> if (sphy->drv_data->cpu_type == TYPE_EXYNOS5250)
> samsung_exynos5_usb2phy_enable(sphy);
> + else if (sphy->drv_data->cpu_type == TYPE_EXYNOS4X12)
> + samsung_exynos4x12_usb2phy_enable(sphy);
> else
> samsung_usb2phy_enable(sphy);
>
> @@ -336,6 +412,8 @@ static void samsung_usb2phy_shutdown(struct usb_phy *phy)
> /* De-initialize usb phy registers */
> if (sphy->drv_data->cpu_type == TYPE_EXYNOS5250)
> samsung_exynos5_usb2phy_disable(sphy);
> + if (sphy->drv_data->cpu_type == TYPE_EXYNOS4X12)
> + samsung_exynos4x12_usb2phy_disable(sphy);
> else
> samsung_usb2phy_disable(sphy);
>
> @@ -451,6 +529,12 @@ static const struct samsung_usbphy_drvdata usb2phy_exynos4 = {
> .hostphy_en_mask = EXYNOS_USBPHY_ENABLE,
> };
>
> +static const struct samsung_usbphy_drvdata usb2phy_exynos4x12 = {
> + .cpu_type = TYPE_EXYNOS4X12,
> + .devphy_en_mask = EXYNOS_USBPHY_ENABLE,
> + .hostphy_en_mask = EXYNOS_USBPHY_ENABLE,
> +};
> +
> static struct samsung_usbphy_drvdata usb2phy_exynos5 = {
> .cpu_type = TYPE_EXYNOS5250,
> .hostphy_en_mask = EXYNOS_USBPHY_ENABLE,
> @@ -466,6 +550,9 @@ static const struct of_device_id samsung_usbphy_dt_match[] = {
> .compatible = "samsung,exynos4210-usb2phy",
> .data = &usb2phy_exynos4,
> }, {
> + .compatible = "samsung,exynos4x12-usb2phy",
> + .data = &usb2phy_exynos4x12,
> + }, {
> .compatible = "samsung,exynos5250-usb2phy",
> .data = &usb2phy_exynos5
> },
> @@ -482,6 +569,9 @@ static struct platform_device_id samsung_usbphy_driver_ids[] = {
> .name = "exynos4210-usb2phy",
> .driver_data = (unsigned long)&usb2phy_exynos4,
> }, {
> + .name = "exynos4x12-usb2phy",
> + .driver_data = (unsigned long)&usb2phy_exynos4x12,
> + }, {
> .name = "exynos5250-usb2phy",
> .driver_data = (unsigned long)&usb2phy_exynos5,
> },
> --
> 1.7.9.5
>
> _______________________________________________
> devicetree-discuss mailing list
> devicetree-discuss@xxxxxxxxxxxxxxxx
> https://lists.ozlabs.org/listinfo/devicetree-discuss

--
Best Regards
Vivek
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Next message: Ingo Molnar: "Re: [PATCH 0/9] perf: Adding better precise_ip field handling"
Previous message: Thomas Gleixner: "Re: NOHZ: WARNING: at arch/x86/kernel/smp.c:123native_smp_send_reschedule"
In reply to: Dongjin Kim: "[PATCH] usb: phy: samsung: adding usbphy for Exynos4X12"
Next in thread: Tomasz Figa: "Re: [PATCH] usb: phy: samsung: adding usbphy for Exynos4X12"
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