On Tue, 2019-05-14 at 07:38 +0000, Peter Chen wrote:
> At imx7ulp, the USB related analog register is located in PHY register
> region too, so we need to control PLL at PHY driver directly.
>
> Signed-off-by: Peter Chen <[email protected]>
> ---
> drivers/usb/phy/phy-mxs-usb.c | 76
> ++++++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 75 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/usb/phy/phy-mxs-usb.c b/drivers/usb/phy/phy-mxs-usb.c
> index 1b1bb0ad40c3..90c96a8e9342 100644
> --- a/drivers/usb/phy/phy-mxs-usb.c
> +++ b/drivers/usb/phy/phy-mxs-usb.c
> @@ -20,6 +20,7 @@
>
> #define DRIVER_NAME "mxs_phy"
>
> +/* Register Macro */
> #define HW_USBPHY_PWD 0x00
> #define HW_USBPHY_TX 0x10
> #define HW_USBPHY_CTRL 0x30
> @@ -37,6 +38,11 @@
> #define GM_USBPHY_TX_TXCAL45DN(x) (((x) & 0xf) << 8)
> #define GM_USBPHY_TX_D_CAL(x) (((x) & 0xf) << 0)
>
> +/* imx7ulp */
> +#define HW_USBPHY_PLL_SIC 0xa0
> +#define HW_USBPHY_PLL_SIC_SET 0xa4
> +#define HW_USBPHY_PLL_SIC_CLR 0xa8
> +
> #define BM_USBPHY_CTRL_SFTRST BIT(31)
> #define BM_USBPHY_CTRL_CLKGATE BIT(30)
> #define BM_USBPHY_CTRL_OTG_ID_VALUE BIT(27)
> @@ -55,6 +61,12 @@
> #define BM_USBPHY_IP_FIX (BIT(17) | BIT(18))
>
> #define BM_USBPHY_DEBUG_CLKGATE BIT(30)
> +/* imx7ulp */
> +#define BM_USBPHY_PLL_LOCK BIT(31)
> +#define BM_USBPHY_PLL_REG_ENABLE BIT(21)
> +#define BM_USBPHY_PLL_BYPASS BIT(16)
> +#define BM_USBPHY_PLL_POWER BIT(12)
> +#define BM_USBPHY_PLL_EN_USB_CLKS BIT(6)
>
> /* Anatop Registers */
> #define ANADIG_ANA_MISC0 0x150
> @@ -167,6 +179,9 @@ static const struct mxs_phy_data imx6ul_phy_data = {
> .flags = MXS_PHY_DISCONNECT_LINE_WITHOUT_VBUS,
> };
>
> +static const struct mxs_phy_data imx7ulp_phy_data = {
> +};
> +
> static const struct of_device_id mxs_phy_dt_ids[] = {
> { .compatible = "fsl,imx6sx-usbphy", .data = &imx6sx_phy_data, },
> { .compatible = "fsl,imx6sl-usbphy", .data = &imx6sl_phy_data, },
> @@ -174,6 +189,7 @@ static const struct of_device_id mxs_phy_dt_ids[] = {
> { .compatible = "fsl,imx23-usbphy", .data = &imx23_phy_data, },
> { .compatible = "fsl,vf610-usbphy", .data = &vf610_phy_data, },
> { .compatible = "fsl,imx6ul-usbphy", .data = &imx6ul_phy_data, },
> + { .compatible = "fsl,imx7ulp-usbphy", .data = &imx7ulp_phy_data, },
> { /* sentinel */ }
> };
> MODULE_DEVICE_TABLE(of, mxs_phy_dt_ids);
> @@ -198,6 +214,11 @@ static inline bool is_imx6sl_phy(struct mxs_phy *mxs_phy)
> return mxs_phy->data == &imx6sl_phy_data;
> }
>
> +static inline bool is_imx7ulp_phy(struct mxs_phy *mxs_phy)
> +{
> + return mxs_phy->data == &imx7ulp_phy_data;
> +}
> +
> /*
> * PHY needs some 32K cycles to switch from 32K clock to
> * bus (such as AHB/AXI, etc) clock.
> @@ -221,14 +242,59 @@ static void mxs_phy_tx_init(struct mxs_phy *mxs_phy)
> }
> }
>
> +static int wait_for_pll_lock(const void __iomem *base)
> +{
> + int loop_count = 100;
> +
> + /* Wait for PLL to lock */
> + do {
> + if (readl(base + HW_USBPHY_PLL_SIC) & BM_USBPHY_PLL_LOCK)
> + break;
> + usleep_range(100, 150);
> + } while (loop_count-- > 0);
> +
there is a common API readl_poll_timeout(), maybe you can try it.
> + return readl(base + HW_USBPHY_PLL_SIC) & BM_USBPHY_PLL_LOCK
> + ? 0 : -ETIMEDOUT;
> +}
> +
> +static int mxs_phy_pll_enable(void __iomem *base, bool enable)
> +{
> + int ret = 0;
> +
> + if (enable) {
> + writel(BM_USBPHY_PLL_REG_ENABLE, base + HW_USBPHY_PLL_SIC_SET);
> + writel(BM_USBPHY_PLL_BYPASS, base + HW_USBPHY_PLL_SIC_CLR);
> + writel(BM_USBPHY_PLL_POWER, base + HW_USBPHY_PLL_SIC_SET);
> + ret = wait_for_pll_lock(base);
> + if (ret)
> + return ret;
> + writel(BM_USBPHY_PLL_EN_USB_CLKS, base +
> + HW_USBPHY_PLL_SIC_SET);
> + } else {
> + writel(BM_USBPHY_PLL_EN_USB_CLKS, base +
> + HW_USBPHY_PLL_SIC_CLR);
> + writel(BM_USBPHY_PLL_POWER, base + HW_USBPHY_PLL_SIC_CLR);
> + writel(BM_USBPHY_PLL_BYPASS, base + HW_USBPHY_PLL_SIC_SET);
> + writel(BM_USBPHY_PLL_REG_ENABLE, base + HW_USBPHY_PLL_SIC_CLR);
> + }
> +
> + return ret;
> +}
> +
> static int mxs_phy_hw_init(struct mxs_phy *mxs_phy)
> {
> int ret;
> void __iomem *base = mxs_phy->phy.io_priv;
>
> + if (is_imx7ulp_phy(mxs_phy)) {
> + ret = mxs_phy_pll_enable(base, true);
> + if (ret)
> + return ret;
> + }
> +
> ret = stmp_reset_block(base + HW_USBPHY_CTRL);
> if (ret)
> - return ret;
> + goto disable_pll;
>
> /* Power up the PHY */
> writel(0, base + HW_USBPHY_PWD);
> @@ -253,6 +319,11 @@ static int mxs_phy_hw_init(struct mxs_phy *mxs_phy)
> mxs_phy_tx_init(mxs_phy);
>
> return 0;
> +
> +disable_pll:
> + if (is_imx7ulp_phy(mxs_phy))
> + mxs_phy_pll_enable(base, false);
> + return ret;
> }
>
> /* Return true if the vbus is there */
> @@ -374,6 +445,9 @@ static void mxs_phy_shutdown(struct usb_phy *phy)
> writel(BM_USBPHY_CTRL_CLKGATE,
> phy->io_priv + HW_USBPHY_CTRL_SET);
>
> + if (is_imx7ulp_phy(mxs_phy))
> + mxs_phy_pll_enable(phy->io_priv, false);
> +
> clk_disable_unprepare(mxs_phy->clk);
> }
>
