1 files changed, 190 insertions, 0 deletions

diff --git a/drivers/usb/dwc2/core.c b/drivers/usb/dwc2/core.c
index 55d5ae2a7ec7..01ac4a064feb 100644
--- a/drivers/usb/dwc2/core.c
+++ b/drivers/usb/dwc2/core.c
@@ -1020,6 +1020,196 @@ int dwc2_hsotg_wait_bit_clear(struct dwc2_hsotg *hsotg, u32 offset, u32 mask,
         return -ETIMEDOUT;
 }
 
+/*
+ * Initializes the FSLSPClkSel field of the HCFG register depending on the
+ * PHY type
+ */
+void dwc2_init_fs_ls_pclk_sel(struct dwc2_hsotg *hsotg)
+{
+        u32 hcfg, val;
+
+        if ((hsotg->hw_params.hs_phy_type == GHWCFG2_HS_PHY_TYPE_ULPI &&
+             hsotg->hw_params.fs_phy_type == GHWCFG2_FS_PHY_TYPE_DEDICATED &&
+             hsotg->params.ulpi_fs_ls) ||
+            hsotg->params.phy_type == DWC2_PHY_TYPE_PARAM_FS) {
+                /* Full speed PHY */
+                val = HCFG_FSLSPCLKSEL_48_MHZ;
+        } else {
+                /* High speed PHY running at full speed or high speed */
+                val = HCFG_FSLSPCLKSEL_30_60_MHZ;
+        }
+
+        dev_dbg(hsotg->dev, "Initializing HCFG.FSLSPClkSel to %08x\n", val);
+        hcfg = dwc2_readl(hsotg, HCFG);
+        hcfg &= ~HCFG_FSLSPCLKSEL_MASK;
+        hcfg |= val << HCFG_FSLSPCLKSEL_SHIFT;
+        dwc2_writel(hsotg, hcfg, HCFG);
+}
+
+static int dwc2_fs_phy_init(struct dwc2_hsotg *hsotg, bool select_phy)
+{
+        u32 usbcfg, ggpio, i2cctl;
+        int retval = 0;
+
+        /*
+         * core_init() is now called on every switch so only call the
+         * following for the first time through
+         */
+        if (select_phy) {
+                dev_dbg(hsotg->dev, "FS PHY selected\n");
+
+                usbcfg = dwc2_readl(hsotg, GUSBCFG);
+                if (!(usbcfg & GUSBCFG_PHYSEL)) {
+                        usbcfg |= GUSBCFG_PHYSEL;
+                        dwc2_writel(hsotg, usbcfg, GUSBCFG);
+
+                        /* Reset after a PHY select */
+                        retval = dwc2_core_reset(hsotg, false);
+
+                        if (retval) {
+                                dev_err(hsotg->dev,
+                                        "%s: Reset failed, aborting", __func__);
+                                return retval;
+                        }
+                }
+
+                if (hsotg->params.activate_stm_fs_transceiver) {
+                        ggpio = dwc2_readl(hsotg, GGPIO);
+                        if (!(ggpio & GGPIO_STM32_OTG_GCCFG_PWRDWN)) {
+                                dev_dbg(hsotg->dev, "Activating transceiver\n");
+                                /*
+                                 * STM32F4x9 uses the GGPIO register as general
+                                 * core configuration register.
+                                 */
+                                ggpio |= GGPIO_STM32_OTG_GCCFG_PWRDWN;
+                                dwc2_writel(hsotg, ggpio, GGPIO);
+                        }
+                }
+        }
+
+        /*
+         * Program DCFG.DevSpd or HCFG.FSLSPclkSel to 48Mhz in FS. Also
+         * do this on HNP Dev/Host mode switches (done in dev_init and
+         * host_init).
+         */
+        if (dwc2_is_host_mode(hsotg))
+                dwc2_init_fs_ls_pclk_sel(hsotg);
+
+        if (hsotg->params.i2c_enable) {
+                dev_dbg(hsotg->dev, "FS PHY enabling I2C\n");
+
+                /* Program GUSBCFG.OtgUtmiFsSel to I2C */
+                usbcfg = dwc2_readl(hsotg, GUSBCFG);
+                usbcfg |= GUSBCFG_OTG_UTMI_FS_SEL;
+                dwc2_writel(hsotg, usbcfg, GUSBCFG);
+
+                /* Program GI2CCTL.I2CEn */
+                i2cctl = dwc2_readl(hsotg, GI2CCTL);
+                i2cctl &= ~GI2CCTL_I2CDEVADDR_MASK;
+                i2cctl |= 1 << GI2CCTL_I2CDEVADDR_SHIFT;
+                i2cctl &= ~GI2CCTL_I2CEN;
+                dwc2_writel(hsotg, i2cctl, GI2CCTL);
+                i2cctl |= GI2CCTL_I2CEN;
+                dwc2_writel(hsotg, i2cctl, GI2CCTL);
+        }
+
+        return retval;
+}
+
+static int dwc2_hs_phy_init(struct dwc2_hsotg *hsotg, bool select_phy)
+{
+        u32 usbcfg, usbcfg_old;
+        int retval = 0;
+
+        if (!select_phy)
+                return 0;
+
+        usbcfg = dwc2_readl(hsotg, GUSBCFG);
+        usbcfg_old = usbcfg;
+
+        /*
+         * HS PHY parameters. These parameters are preserved during soft reset
+         * so only program the first time. Do a soft reset immediately after
+         * setting phyif.
+         */
+        switch (hsotg->params.phy_type) {
+        case DWC2_PHY_TYPE_PARAM_ULPI:
+                /* ULPI interface */
+                dev_dbg(hsotg->dev, "HS ULPI PHY selected\n");
+                usbcfg |= GUSBCFG_ULPI_UTMI_SEL;
+                usbcfg &= ~(GUSBCFG_PHYIF16 | GUSBCFG_DDRSEL);
+                if (hsotg->params.phy_ulpi_ddr)
+                        usbcfg |= GUSBCFG_DDRSEL;
+
+                /* Set external VBUS indicator as needed. */
+                if (hsotg->params.oc_disable)
+                        usbcfg |= (GUSBCFG_ULPI_INT_VBUS_IND |
+                                   GUSBCFG_INDICATORPASSTHROUGH);
+                break;
+        case DWC2_PHY_TYPE_PARAM_UTMI:
+                /* UTMI+ interface */
+                dev_dbg(hsotg->dev, "HS UTMI+ PHY selected\n");
+                usbcfg &= ~(GUSBCFG_ULPI_UTMI_SEL | GUSBCFG_PHYIF16);
+                if (hsotg->params.phy_utmi_width == 16)
+                        usbcfg |= GUSBCFG_PHYIF16;
+                break;
+        default:
+                dev_err(hsotg->dev, "FS PHY selected at HS!\n");
+                break;
+        }
+
+        if (usbcfg != usbcfg_old) {
+                dwc2_writel(hsotg, usbcfg, GUSBCFG);
+
+                /* Reset after setting the PHY parameters */
+                retval = dwc2_core_reset(hsotg, false);
+                if (retval) {
+                        dev_err(hsotg->dev,
+                                "%s: Reset failed, aborting", __func__);
+                        return retval;
+                }
+        }
+
+        return retval;
+}
+
+int dwc2_phy_init(struct dwc2_hsotg *hsotg, bool select_phy)
+{
+        u32 usbcfg;
+        int retval = 0;
+
+        if ((hsotg->params.speed == DWC2_SPEED_PARAM_FULL ||
+             hsotg->params.speed == DWC2_SPEED_PARAM_LOW) &&
+            hsotg->params.phy_type == DWC2_PHY_TYPE_PARAM_FS) {
+                /* If FS/LS mode with FS/LS PHY */
+                retval = dwc2_fs_phy_init(hsotg, select_phy);
+                if (retval)
+                        return retval;
+        } else {
+                /* High speed PHY */
+                retval = dwc2_hs_phy_init(hsotg, select_phy);
+                if (retval)
+                        return retval;
+        }
+
+        if (hsotg->hw_params.hs_phy_type == GHWCFG2_HS_PHY_TYPE_ULPI &&
+            hsotg->hw_params.fs_phy_type == GHWCFG2_FS_PHY_TYPE_DEDICATED &&
+            hsotg->params.ulpi_fs_ls) {
+                dev_dbg(hsotg->dev, "Setting ULPI FSLS\n");
+                usbcfg = dwc2_readl(hsotg, GUSBCFG);
+                usbcfg |= GUSBCFG_ULPI_FS_LS;
+                usbcfg |= GUSBCFG_ULPI_CLK_SUSP_M;
+                dwc2_writel(hsotg, usbcfg, GUSBCFG);
+        } else {
+                usbcfg = dwc2_readl(hsotg, GUSBCFG);
+                usbcfg &= ~GUSBCFG_ULPI_FS_LS;
+                usbcfg &= ~GUSBCFG_ULPI_CLK_SUSP_M;
+                dwc2_writel(hsotg, usbcfg, GUSBCFG);
+        }
+
+        return retval;
+}
+
 MODULE_DESCRIPTION("DESIGNWARE HS OTG Core");
 MODULE_AUTHOR("Synopsys, Inc.");
 MODULE_LICENSE("Dual BSD/GPL");