[PATCH v2] phy-sun4i-usb: Add support for the host usb-phys found on the H3 SoC

[Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>]

From: Reinder de Haan <patchesrdh-I1/eAgTnXDYAvxtiuMwx3w@public.gmane.org>

Note this commit only adds support for phys 1-3, phy 0, the otg phy, is
not yet (fully) supported after this commit.

Signed-off-by: Reinder de Haan <patchesrdh-I1/eAgTnXDYAvxtiuMwx3w@public.gmane.org>
Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
Changes in v2:
-Change break; after dev_err() to return, as intended, fixing a compiler
 warning (the dev_err case should never be reached).
---
 .../devicetree/bindings/phy/sun4i-usb-phy.txt      |  1 +
 drivers/phy/phy-sun4i-usb.c                        | 67 +++++++++++++++++-----
 2 files changed, 53 insertions(+), 15 deletions(-)

diff --git a/Documentation/devicetree/bindings/phy/sun4i-usb-phy.txt b/Documentation/devicetree/bindings/phy/sun4i-usb-phy.txt
index 0cebf74..95736d7 100644
--- a/Documentation/devicetree/bindings/phy/sun4i-usb-phy.txt
+++ b/Documentation/devicetree/bindings/phy/sun4i-usb-phy.txt
@@ -9,6 +9,7 @@ Required properties:
   * allwinner,sun7i-a20-usb-phy
   * allwinner,sun8i-a23-usb-phy
   * allwinner,sun8i-a33-usb-phy
+  * allwinner,sun8i-h3-usb-phy
 - reg : a list of offset + length pairs
 - reg-names :
   * "phy_ctrl"
diff --git a/drivers/phy/phy-sun4i-usb.c b/drivers/phy/phy-sun4i-usb.c
index b12964b..11bc9cd 100644
--- a/drivers/phy/phy-sun4i-usb.c
+++ b/drivers/phy/phy-sun4i-usb.c
@@ -46,6 +46,9 @@
 #define REG_PHYBIST			0x08
 #define REG_PHYTUNE			0x0c
 #define REG_PHYCTL_A33			0x10
+#define REG_PHY_UNK_H3			0x20
+
+#define REG_PMU_UNK_H3			0x10
 
 #define PHYCTL_DATA			BIT(7)
 
@@ -79,7 +82,7 @@
 #define PHY_DISCON_TH_SEL		0x2a
 #define PHY_SQUELCH_DETECT		0x3c
 
-#define MAX_PHYS			3
+#define MAX_PHYS			4
 
 /*
  * Note do not raise the debounce time, we must report Vusb high within 100ms
@@ -88,12 +91,19 @@
 #define DEBOUNCE_TIME			msecs_to_jiffies(50)
 #define POLL_TIME			msecs_to_jiffies(250)
 
+enum sun4i_usb_phy_type {
+	sun4i_a10_phy,
+	sun8i_a33_phy,
+	sun8i_h3_phy
+};
+
 struct sun4i_usb_phy_data {
+	struct device *dev;
 	void __iomem *base;
 	struct mutex mutex;
 	int num_phys;
 	u32 disc_thresh;
-	bool has_a33_phyctl;
+	enum sun4i_usb_phy_type type;
 	struct sun4i_usb_phy {
 		struct phy *phy;
 		void __iomem *pmu;
@@ -164,12 +174,18 @@ static void sun4i_usb_phy_write(struct sun4i_usb_phy *phy, u32 addr, u32 data,
 
 	mutex_lock(&phy_data->mutex);
 
-	if (phy_data->has_a33_phyctl) {
+	switch (phy_data->type) {
+	case sun4i_a10_phy:
+		phyctl = phy_data->base + REG_PHYCTL_A10;
+		break;
+	case sun8i_a33_phy:
 		phyctl = phy_data->base + REG_PHYCTL_A33;
 		/* A33 needs us to set phyctl to 0 explicitly */
 		writel(0, phyctl);
-	} else {
-		phyctl = phy_data->base + REG_PHYCTL_A10;
+		break;
+	case sun8i_h3_phy:
+		dev_err(phy_data->dev, "H3 usb_phy_write is not supported\n");
+		return;
 	}
 
 	for (i = 0; i < len; i++) {
@@ -230,6 +246,7 @@ static int sun4i_usb_phy_init(struct phy *_phy)
 	struct sun4i_usb_phy *phy = phy_get_drvdata(_phy);
 	struct sun4i_usb_phy_data *data = to_sun4i_usb_phy_data(phy);
 	int ret;
+	u32 val;
 
 	ret = clk_prepare_enable(phy->clk);
 	if (ret)
@@ -241,15 +258,26 @@ static int sun4i_usb_phy_init(struct phy *_phy)
 		return ret;
 	}
 
-	/* Enable USB 45 Ohm resistor calibration */
-	if (phy->index == 0)
-		sun4i_usb_phy_write(phy, PHY_RES45_CAL_EN, 0x01, 1);
+	if (data->type == sun8i_h3_phy) {
+		if (phy->index == 0) {
+			val = readl(data->base + REG_PHY_UNK_H3);
+			writel(val & ~1, data->base + REG_PHY_UNK_H3);
+		}
+
+		val = readl(phy->pmu + REG_PMU_UNK_H3);
+		writel(val & ~2, phy->pmu + REG_PMU_UNK_H3);
+	} else {
+		/* Enable USB 45 Ohm resistor calibration */
+		if (phy->index == 0)
+			sun4i_usb_phy_write(phy, PHY_RES45_CAL_EN, 0x01, 1);
 
-	/* Adjust PHY's magnitude and rate */
-	sun4i_usb_phy_write(phy, PHY_TX_AMPLITUDE_TUNE, 0x14, 5);
+		/* Adjust PHY's magnitude and rate */
+		sun4i_usb_phy_write(phy, PHY_TX_AMPLITUDE_TUNE, 0x14, 5);
 
-	/* Disconnect threshold adjustment */
-	sun4i_usb_phy_write(phy, PHY_DISCON_TH_SEL, data->disc_thresh, 2);
+		/* Disconnect threshold adjustment */
+		sun4i_usb_phy_write(phy, PHY_DISCON_TH_SEL,
+				    data->disc_thresh, 2);
+	}
 
 	sun4i_usb_phy_passby(phy, 1);
 
@@ -522,11 +550,14 @@ static int sun4i_usb_phy_probe(struct platform_device *pdev)
 	mutex_init(&data->mutex);
 	INIT_DELAYED_WORK(&data->detect, sun4i_usb_phy0_id_vbus_det_scan);
 	dev_set_drvdata(dev, data);
+	data->dev = dev;
 
 	if (of_device_is_compatible(np, "allwinner,sun5i-a13-usb-phy") ||
 	    of_device_is_compatible(np, "allwinner,sun8i-a23-usb-phy") ||
 	    of_device_is_compatible(np, "allwinner,sun8i-a33-usb-phy"))
 		data->num_phys = 2;
+	else if (of_device_is_compatible(np, "allwinner,sun8i-h3-usb-phy"))
+		data->num_phys = 4;
 	else
 		data->num_phys = 3;
 
@@ -538,13 +569,18 @@ static int sun4i_usb_phy_probe(struct platform_device *pdev)
 
 	if (of_device_is_compatible(np, "allwinner,sun6i-a31-usb-phy") ||
 	    of_device_is_compatible(np, "allwinner,sun8i-a23-usb-phy") ||
-	    of_device_is_compatible(np, "allwinner,sun8i-a33-usb-phy"))
+	    of_device_is_compatible(np, "allwinner,sun8i-a33-usb-phy") ||
+	    of_device_is_compatible(np, "allwinner,sun8i-h3-usb-phy"))
 		dedicated_clocks = true;
 	else
 		dedicated_clocks = false;
 
 	if (of_device_is_compatible(np, "allwinner,sun8i-a33-usb-phy"))
-		data->has_a33_phyctl = true;
+		data->type = sun8i_a33_phy;
+	else if (of_device_is_compatible(np, "allwinner,sun8i-h3-usb-phy"))
+		data->type = sun8i_h3_phy;
+	else
+		data->type = sun4i_a10_phy;
 
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy_ctrl");
 	data->base = devm_ioremap_resource(dev, res);
@@ -620,7 +656,7 @@ static int sun4i_usb_phy_probe(struct platform_device *pdev)
 			return PTR_ERR(phy->reset);
 		}
 
-		if (i) { /* No pmu for usbc0 */
+		if (data->type == sun8i_h3_phy || i != 0) {
 			snprintf(name, sizeof(name), "pmu%d", i);
 			res = platform_get_resource_byname(pdev,
 							IORESOURCE_MEM, name);
@@ -696,6 +732,7 @@ static const struct of_device_id sun4i_usb_phy_of_match[] = {
 	{ .compatible = "allwinner,sun7i-a20-usb-phy" },
 	{ .compatible = "allwinner,sun8i-a23-usb-phy" },
 	{ .compatible = "allwinner,sun8i-a33-usb-phy" },
+	{ .compatible = "allwinner,sun8i-h3-usb-phy" },
 	{ },
 };
 MODULE_DEVICE_TABLE(of, sun4i_usb_phy_of_match);
-- 
2.5.0

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