usb: dwc3-generic: implement Qualcomm wrapper

The Qualcomm specific dwc3 wrapper isn't hugely complicated, implemented
the missing initialisation for host and gadget mode.

Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
Link: https://lore.kernel.org/r/20240320-b4-qcom-usb-v4-1-41be480172e1@linaro.org
Signed-off-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>

1 files changed, 80 insertions, 1 deletions

diff --git a/drivers/usb/dwc3/dwc3-generic.c b/drivers/usb/dwc3/dwc3-generic.c
index a379a0002e7..7a00529a2a8 100644
--- a/drivers/usb/dwc3/dwc3-generic.c
+++ b/drivers/usb/dwc3/dwc3-generic.c
@@ -425,6 +425,77 @@ struct dwc3_glue_ops ti_ops = {
 	.glue_configure = dwc3_ti_glue_configure,
 };
 
+/* USB QSCRATCH Hardware registers */
+#define QSCRATCH_GENERAL_CFG 0x08
+#define PIPE_UTMI_CLK_SEL BIT(0)
+#define PIPE3_PHYSTATUS_SW BIT(3)
+#define PIPE_UTMI_CLK_DIS BIT(8)
+
+#define QSCRATCH_HS_PHY_CTRL 0x10
+#define UTMI_OTG_VBUS_VALID BIT(20)
+#define SW_SESSVLD_SEL BIT(28)
+
+#define QSCRATCH_SS_PHY_CTRL 0x30
+#define LANE0_PWR_PRESENT BIT(24)
+
+#define PWR_EVNT_IRQ_STAT_REG 0x58
+#define PWR_EVNT_LPM_IN_L2_MASK BIT(4)
+#define PWR_EVNT_LPM_OUT_L2_MASK BIT(5)
+
+#define SDM845_QSCRATCH_BASE_OFFSET 0xf8800
+#define SDM845_QSCRATCH_SIZE 0x400
+#define SDM845_DWC3_CORE_SIZE 0xcd00
+
+static void dwc3_qcom_vbus_override_enable(void __iomem *qscratch_base, bool enable)
+{
+	if (enable) {
+		setbits_le32(qscratch_base + QSCRATCH_SS_PHY_CTRL,
+				  LANE0_PWR_PRESENT);
+		setbits_le32(qscratch_base + QSCRATCH_HS_PHY_CTRL,
+				  UTMI_OTG_VBUS_VALID | SW_SESSVLD_SEL);
+	} else {
+		clrbits_le32(qscratch_base + QSCRATCH_SS_PHY_CTRL,
+				  LANE0_PWR_PRESENT);
+		clrbits_le32(qscratch_base + QSCRATCH_HS_PHY_CTRL,
+				  UTMI_OTG_VBUS_VALID | SW_SESSVLD_SEL);
+	}
+}
+
+/* For controllers running without superspeed PHYs */
+static void dwc3_qcom_select_utmi_clk(void __iomem *qscratch_base)
+{
+	/* Configure dwc3 to use UTMI clock as PIPE clock not present */
+	setbits_le32(qscratch_base + QSCRATCH_GENERAL_CFG,
+			  PIPE_UTMI_CLK_DIS);
+
+	setbits_le32(qscratch_base + QSCRATCH_GENERAL_CFG,
+			  PIPE_UTMI_CLK_SEL | PIPE3_PHYSTATUS_SW);
+
+	clrbits_le32(qscratch_base + QSCRATCH_GENERAL_CFG,
+			  PIPE_UTMI_CLK_DIS);
+}
+
+static void dwc3_qcom_glue_configure(struct udevice *dev, int index,
+				     enum usb_dr_mode mode)
+{
+	struct dwc3_glue_data *glue = dev_get_plat(dev);
+	void __iomem *qscratch_base = map_physmem(glue->regs, 0x400, MAP_NOCACHE);
+	if (IS_ERR_OR_NULL(qscratch_base)) {
+		log_err("%s: Invalid qscratch base address\n", dev->name);
+		return;
+	}
+
+	if (dev_read_bool(dev, "qcom,select-utmi-as-pipe-clk"))
+		dwc3_qcom_select_utmi_clk(qscratch_base);
+
+	if (mode != USB_DR_MODE_HOST)
+		dwc3_qcom_vbus_override_enable(qscratch_base, true);
+}
+
+struct dwc3_glue_ops qcom_ops = {
+	.glue_configure = dwc3_qcom_glue_configure,
+};
+
 static int dwc3_rk_glue_get_ctrl_dev(struct udevice *dev, ofnode *node)
 {
 	*node = dev_ofnode(dev);
@@ -512,6 +583,14 @@ static int dwc3_glue_reset_init(struct udevice *dev,
 	else if (ret)
 		return ret;
 
+	if (device_is_compatible(dev, "qcom,dwc3")) {
+		reset_assert_bulk(&glue->resets);
+		/* We should wait at least 6 sleep clock cycles, that's
+		 * (6 / 32764) * 1000000 ~= 200us. But some platforms
+		 * have slower sleep clocks so we'll play it safe.
+		 */
+		udelay(500);
+	}
 	ret = reset_deassert_bulk(&glue->resets);
 	if (ret) {
 		reset_release_bulk(&glue->resets);
@@ -629,7 +708,7 @@ static const struct udevice_id dwc3_glue_ids[] = {
 	{ .compatible = "rockchip,rk3399-dwc3" },
 	{ .compatible = "rockchip,rk3568-dwc3", .data = (ulong)&rk_ops },
 	{ .compatible = "rockchip,rk3588-dwc3", .data = (ulong)&rk_ops },
-	{ .compatible = "qcom,dwc3" },
+	{ .compatible = "qcom,dwc3", .data = (ulong)&qcom_ops },
 	{ .compatible = "fsl,imx8mp-dwc3", .data = (ulong)&imx8mp_ops },
 	{ .compatible = "fsl,imx8mq-dwc3" },
 	{ .compatible = "intel,tangier-dwc3" },