[PATCH 1/5] usb: dwc3-generic: implement Qualcomm wrapper

Caleb Connolly
2024-01-31T14:58:02Z

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

Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
---
drivers/usb/dwc3/dwc3-generic.c | 99 ++++++++++++++++++++++++++++++++++++++++-
1 file changed, 98 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/dwc3/dwc3-generic.c b/drivers/usb/dwc3/dwc3-generic.c
index 48da621ba966..1119cdecd26d 100644
--- a/drivers/usb/dwc3/dwc3-generic.c
+++ b/drivers/usb/dwc3/dwc3-generic.c
@@ -419,6 +419,99 @@ struct dwc3_glue_ops ti_ops = {
.glue_configure = dwc3_ti_glue_configure,
};

+/* USB QSCRATCH Hardware registers */
+#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 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 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 inline void dwc3_qcom_setbits(void __iomem *base, u32 offset, u32 val)
+{
+ u32 reg;
+
+ reg = readl(base + offset);
+ reg |= val;
+ writel(reg, base + offset);
+
+ /* ensure that above write is through */
+ readl(base + offset);
+}
+
+static inline void dwc3_qcom_clrbits(void __iomem *base, u32 offset, u32 val)
+{
+ u32 reg;
+
+ reg = readl(base + offset);
+ reg &= ~val;
+ writel(reg, base + offset);
+
+ /* ensure that above write is through */
+ readl(base + offset);
+}
+
+static void dwc3_qcom_vbus_override_enable(void __iomem *qscratch_base, bool enable)
+{
+ if (enable) {
+ dwc3_qcom_setbits(qscratch_base, QSCRATCH_SS_PHY_CTRL,
+ LANE0_PWR_PRESENT);
+ dwc3_qcom_setbits(qscratch_base, QSCRATCH_HS_PHY_CTRL,
+ UTMI_OTG_VBUS_VALID | SW_SESSVLD_SEL);
+ } else {
+ dwc3_qcom_clrbits(qscratch_base, QSCRATCH_SS_PHY_CTRL,
+ LANE0_PWR_PRESENT);
+ dwc3_qcom_clrbits(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 */
+ dwc3_qcom_setbits(qscratch_base, QSCRATCH_GENERAL_CFG,
+ PIPE_UTMI_CLK_DIS);
+
+ udelay(500);
+
+ dwc3_qcom_setbits(qscratch_base, QSCRATCH_GENERAL_CFG,
+ PIPE_UTMI_CLK_SEL | PIPE3_PHYSTATUS_SW);
+
+ udelay(500);
+
+ dwc3_qcom_clrbits(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)
+{
+ void __iomem *qscratch_base = (void __iomem *)dev_read_addr(dev);
+
+ 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);
@@ -506,6 +599,10 @@ 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);
+ udelay(500);
+ }
ret = reset_deassert_bulk(&glue->resets);
if (ret) {
reset_release_bulk(&glue->resets);
@@ -623,7 +720,7 @@ 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" },

--
2.43.0