usb: dwc3: meson-g12a: handle the phy and glue registers separately

On the Amlogic GXL/GXM SoCs, only the USB control registers are available,
the PHY mode being handled in the PHY registers.

Thus, handle the PHY mode registers in separate regmaps and prepare
support for Amlogic GXL/GXM SoCs by moving the regmap setup in a callback
set in the SoC match data.
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>

drivers/usb/dwc3/dwc3-meson-g12a.c

@@ -30,7 +30,7 @@
 #include <linux/usb/role.h>
 #include <linux/regulator/consumer.h>
 
-/* USB2 Ports Control Registers */
+/* USB2 Ports Control Registers, offsets are per-port */
 
 #define U2P_REG_SIZE						0x20
 
@@ -50,14 +50,16 @@
 
 /* USB Glue Control Registers */
 
-#define USB_R0							0x80
+#define G12A_GLUE_OFFSET					0x80
+
+#define USB_R0							0x00
 	#define USB_R0_P30_LANE0_TX2RX_LOOPBACK			BIT(17)
 	#define USB_R0_P30_LANE0_EXT_PCLK_REQ			BIT(18)
 	#define USB_R0_P30_PCS_RX_LOS_MASK_VAL_MASK		GENMASK(28, 19)
 	#define USB_R0_U2D_SS_SCALEDOWN_MODE_MASK		GENMASK(30, 29)
 	#define USB_R0_U2D_ACT					BIT(31)
 
-#define USB_R1							0x84
+#define USB_R1							0x04
 	#define USB_R1_U3H_BIGENDIAN_GS				BIT(0)
 	#define USB_R1_U3H_PME_ENABLE				BIT(1)
 	#define USB_R1_U3H_HUB_PORT_OVERCURRENT_MASK		GENMASK(4, 2)
@@ -69,23 +71,23 @@
 	#define USB_R1_U3H_FLADJ_30MHZ_REG_MASK			GENMASK(24, 19)
 	#define USB_R1_P30_PCS_TX_SWING_FULL_MASK		GENMASK(31, 25)
 
-#define USB_R2							0x88
+#define USB_R2							0x08
 	#define USB_R2_P30_PCS_TX_DEEMPH_3P5DB_MASK		GENMASK(25, 20)
 	#define USB_R2_P30_PCS_TX_DEEMPH_6DB_MASK		GENMASK(31, 26)
 
-#define USB_R3							0x8c
+#define USB_R3							0x0c
 	#define USB_R3_P30_SSC_ENABLE				BIT(0)
 	#define USB_R3_P30_SSC_RANGE_MASK			GENMASK(3, 1)
 	#define USB_R3_P30_SSC_REF_CLK_SEL_MASK			GENMASK(12, 4)
 	#define USB_R3_P30_REF_SSP_EN				BIT(13)
 
-#define USB_R4							0x90
+#define USB_R4							0x10
 	#define USB_R4_P21_PORT_RESET_0				BIT(0)
 	#define USB_R4_P21_SLEEP_M0				BIT(1)
 	#define USB_R4_MEM_PD_MASK				GENMASK(3, 2)
 	#define USB_R4_P21_ONLY					BIT(4)
 
-#define USB_R5							0x94
+#define USB_R5							0x14
 	#define USB_R5_ID_DIG_SYNC				BIT(0)
 	#define USB_R5_ID_DIG_REG				BIT(1)
 	#define USB_R5_ID_DIG_CFG_MASK				GENMASK(3, 2)
@@ -125,20 +127,27 @@ static const char *meson_a1_phy_names[] = {
 	"usb2-phy0", "usb2-phy1"
 };
 
+struct dwc3_meson_g12a;
+
 struct dwc3_meson_g12a_drvdata {
 	bool otg_switch_supported;
 	struct clk_bulk_data *clks;
 	int num_clks;
 	const char **phy_names;
 	int num_phys;
+	int (*setup_regmaps)(struct dwc3_meson_g12a *priv, void __iomem *base);
 };
 
+static int dwc3_meson_g12a_setup_regmaps(struct dwc3_meson_g12a *priv,
+					 void __iomem *base);
+
 static struct dwc3_meson_g12a_drvdata g12a_drvdata = {
 	.otg_switch_supported = true,
 	.clks = meson_g12a_clocks,
 	.num_clks = ARRAY_SIZE(meson_g12a_clocks),
 	.phy_names = meson_g12a_phy_names,
 	.num_phys = ARRAY_SIZE(meson_g12a_phy_names),
+	.setup_regmaps = dwc3_meson_g12a_setup_regmaps,
 };
 
 static struct dwc3_meson_g12a_drvdata a1_drvdata = {
@@ -147,11 +156,13 @@ static struct dwc3_meson_g12a_drvdata a1_drvdata = {
 	.num_clks = ARRAY_SIZE(meson_a1_clocks),
 	.phy_names = meson_a1_phy_names,
 	.num_phys = ARRAY_SIZE(meson_a1_phy_names),
+	.setup_regmaps = dwc3_meson_g12a_setup_regmaps,
 };
 
 struct dwc3_meson_g12a {
 	struct device		*dev;
-	struct regmap		*regmap;
+	struct regmap		*u2p_regmap[PHY_COUNT];
+	struct regmap		*usb_glue_regmap;
 	struct reset_control	*reset;
 	struct phy		*phys[PHY_COUNT];
 	enum usb_dr_mode	otg_mode;
@@ -168,11 +179,11 @@ static void dwc3_meson_g12a_usb2_set_mode(struct dwc3_meson_g12a *priv,
 					  int i, enum phy_mode mode)
 {
 	if (mode == PHY_MODE_USB_HOST)
-		regmap_update_bits(priv->regmap, U2P_R0 + (U2P_REG_SIZE * i),
+		regmap_update_bits(priv->u2p_regmap[i], U2P_R0,
 				U2P_R0_HOST_DEVICE,
 				U2P_R0_HOST_DEVICE);
 	else
-		regmap_update_bits(priv->regmap, U2P_R0 + (U2P_REG_SIZE * i),
+		regmap_update_bits(priv->u2p_regmap[i], U2P_R0,
 				U2P_R0_HOST_DEVICE, 0);
 }
 
@@ -192,13 +203,12 @@ static int dwc3_meson_g12a_usb2_init(struct dwc3_meson_g12a *priv)
 		if (!strstr(priv->drvdata->phy_names[i], "usb2"))
 			continue;
 
-		regmap_update_bits(priv->regmap, U2P_R0 + (U2P_REG_SIZE * i),
+		regmap_update_bits(priv->u2p_regmap[i], U2P_R0,
 				   U2P_R0_POWER_ON_RESET,
 				   U2P_R0_POWER_ON_RESET);
 
 		if (priv->drvdata->otg_switch_supported && i == USB2_OTG_PHY) {
-			regmap_update_bits(priv->regmap,
-				U2P_R0 + (U2P_REG_SIZE * i),
+			regmap_update_bits(priv->u2p_regmap[i], U2P_R0,
 				U2P_R0_ID_PULLUP | U2P_R0_DRV_VBUS,
 				U2P_R0_ID_PULLUP | U2P_R0_DRV_VBUS);
 
@@ -208,7 +218,7 @@ static int dwc3_meson_g12a_usb2_init(struct dwc3_meson_g12a *priv)
 			dwc3_meson_g12a_usb2_set_mode(priv, i,
 						      PHY_MODE_USB_HOST);
 
-		regmap_update_bits(priv->regmap, U2P_R0 + (U2P_REG_SIZE * i),
+		regmap_update_bits(priv->u2p_regmap[i], U2P_R0,
 				   U2P_R0_POWER_ON_RESET, 0);
 	}
 
@@ -217,7 +227,7 @@ static int dwc3_meson_g12a_usb2_init(struct dwc3_meson_g12a *priv)
 
 static void dwc3_meson_g12a_usb3_init(struct dwc3_meson_g12a *priv)
 {
-	regmap_update_bits(priv->regmap, USB_R3,
+	regmap_update_bits(priv->usb_glue_regmap, USB_R3,
 			USB_R3_P30_SSC_RANGE_MASK |
 			USB_R3_P30_REF_SSP_EN,
 			USB_R3_P30_SSC_ENABLE |
@@ -225,21 +235,21 @@ static void dwc3_meson_g12a_usb3_init(struct dwc3_meson_g12a *priv)
 			USB_R3_P30_REF_SSP_EN);
 	udelay(2);
 
-	regmap_update_bits(priv->regmap, USB_R2,
+	regmap_update_bits(priv->usb_glue_regmap, USB_R2,
 			USB_R2_P30_PCS_TX_DEEMPH_3P5DB_MASK,
 			FIELD_PREP(USB_R2_P30_PCS_TX_DEEMPH_3P5DB_MASK, 0x15));
 
-	regmap_update_bits(priv->regmap, USB_R2,
+	regmap_update_bits(priv->usb_glue_regmap, USB_R2,
 			USB_R2_P30_PCS_TX_DEEMPH_6DB_MASK,
 			FIELD_PREP(USB_R2_P30_PCS_TX_DEEMPH_6DB_MASK, 0x20));
 
 	udelay(2);
 
-	regmap_update_bits(priv->regmap, USB_R1,
+	regmap_update_bits(priv->usb_glue_regmap, USB_R1,
 			USB_R1_U3H_HOST_PORT_POWER_CONTROL_PRESENT,
 			USB_R1_U3H_HOST_PORT_POWER_CONTROL_PRESENT);
 
-	regmap_update_bits(priv->regmap, USB_R1,
+	regmap_update_bits(priv->usb_glue_regmap, USB_R1,
 			USB_R1_P30_PCS_TX_SWING_FULL_MASK,
 			FIELD_PREP(USB_R1_P30_PCS_TX_SWING_FULL_MASK, 127));
 }
@@ -247,16 +257,16 @@ static void dwc3_meson_g12a_usb3_init(struct dwc3_meson_g12a *priv)
 static void dwc3_meson_g12a_usb_otg_apply_mode(struct dwc3_meson_g12a *priv)
 {
 	if (priv->otg_phy_mode == PHY_MODE_USB_DEVICE) {
-		regmap_update_bits(priv->regmap, USB_R0,
+		regmap_update_bits(priv->usb_glue_regmap, USB_R0,
 				USB_R0_U2D_ACT, USB_R0_U2D_ACT);
-		regmap_update_bits(priv->regmap, USB_R0,
+		regmap_update_bits(priv->usb_glue_regmap, USB_R0,
 				USB_R0_U2D_SS_SCALEDOWN_MODE_MASK, 0);
-		regmap_update_bits(priv->regmap, USB_R4,
+		regmap_update_bits(priv->usb_glue_regmap, USB_R4,
 				USB_R4_P21_SLEEP_M0, USB_R4_P21_SLEEP_M0);
 	} else {
-		regmap_update_bits(priv->regmap, USB_R0,
+		regmap_update_bits(priv->usb_glue_regmap, USB_R0,
 				USB_R0_U2D_ACT, 0);
-		regmap_update_bits(priv->regmap, USB_R4,
+		regmap_update_bits(priv->usb_glue_regmap, USB_R4,
 				USB_R4_P21_SLEEP_M0, 0);
 	}
 }
@@ -269,17 +279,17 @@ static int dwc3_meson_g12a_usb_init(struct dwc3_meson_g12a *priv)
 	if (ret)
 		return ret;
 
-	regmap_update_bits(priv->regmap, USB_R1,
+	regmap_update_bits(priv->usb_glue_regmap, USB_R1,
 			USB_R1_U3H_FLADJ_30MHZ_REG_MASK,
 			FIELD_PREP(USB_R1_U3H_FLADJ_30MHZ_REG_MASK, 0x20));
 
-	regmap_update_bits(priv->regmap, USB_R5,
+	regmap_update_bits(priv->usb_glue_regmap, USB_R5,
 			USB_R5_ID_DIG_EN_0,
 			USB_R5_ID_DIG_EN_0);
-	regmap_update_bits(priv->regmap, USB_R5,
+	regmap_update_bits(priv->usb_glue_regmap, USB_R5,
 			USB_R5_ID_DIG_EN_1,
 			USB_R5_ID_DIG_EN_1);
-	regmap_update_bits(priv->regmap, USB_R5,
+	regmap_update_bits(priv->usb_glue_regmap, USB_R5,
 			USB_R5_ID_DIG_TH_MASK,
 			FIELD_PREP(USB_R5_ID_DIG_TH_MASK, 0xff));
 
@@ -292,7 +302,8 @@ static int dwc3_meson_g12a_usb_init(struct dwc3_meson_g12a *priv)
 	return 0;
 }
 
-static const struct regmap_config phy_meson_g12a_usb3_regmap_conf = {
+static const struct regmap_config phy_meson_g12a_usb_glue_regmap_conf = {
+	.name = "usb-glue",
 	.reg_bits = 8,
 	.val_bits = 32,
 	.reg_stride = 4,
@@ -329,7 +340,7 @@ static enum phy_mode dwc3_meson_g12a_get_id(struct dwc3_meson_g12a *priv)
 {
 	u32 reg;
 
-	regmap_read(priv->regmap, USB_R5, &reg);
+	regmap_read(priv->usb_glue_regmap, USB_R5, &reg);
 
 	if (reg & (USB_R5_ID_DIG_SYNC | USB_R5_ID_DIG_REG))
 		return PHY_MODE_USB_DEVICE;
@@ -405,7 +416,8 @@ static irqreturn_t dwc3_meson_g12a_irq_thread(int irq, void *data)
 			dev_warn(priv->dev, "Failed to switch OTG mode\n");
 	}
 
-	regmap_update_bits(priv->regmap, USB_R5, USB_R5_ID_DIG_IRQ, 0);
+	regmap_update_bits(priv->usb_glue_regmap, USB_R5,
+			   USB_R5_ID_DIG_IRQ, 0);
 
 	return IRQ_HANDLED;
 }
@@ -440,7 +452,7 @@ static int dwc3_meson_g12a_otg_init(struct platform_device *pdev,
 
 	if (priv->otg_mode == USB_DR_MODE_OTG) {
 		/* Ack irq before registering */
-		regmap_update_bits(priv->regmap, USB_R5,
+		regmap_update_bits(priv->usb_glue_regmap, USB_R5,
 				   USB_R5_ID_DIG_IRQ, 0);
 
 		irq = platform_get_irq(pdev, 0);
@@ -476,6 +488,41 @@ static int dwc3_meson_g12a_otg_init(struct platform_device *pdev,
 	return 0;
 }
 
+static int dwc3_meson_g12a_setup_regmaps(struct dwc3_meson_g12a *priv,
+					 void __iomem *base)
+{
+	int i;
+
+	priv->usb_glue_regmap = devm_regmap_init_mmio(priv->dev,
+					base + G12A_GLUE_OFFSET,
+					&phy_meson_g12a_usb_glue_regmap_conf);
+	if (IS_ERR(priv->usb_glue_regmap))
+		return PTR_ERR(priv->usb_glue_regmap);
+
+	/* Create a regmap for each USB2 PHY control register set */
+	for (i = 0; i < priv->usb2_ports; i++) {
+		struct regmap_config u2p_regmap_config = {
+			.reg_bits = 8,
+			.val_bits = 32,
+			.reg_stride = 4,
+			.max_register = U2P_R1,
+		};
+
+		u2p_regmap_config.name = devm_kasprintf(priv->dev, GFP_KERNEL,
+							"u2p-%d", i);
+		if (!u2p_regmap_config.name)
+			return -ENOMEM;
+
+		priv->u2p_regmap[i] = devm_regmap_init_mmio(priv->dev,
+						base + (i * U2P_REG_SIZE),
+						&u2p_regmap_config);
+		if (IS_ERR(priv->u2p_regmap[i]))
+			return PTR_ERR(priv->u2p_regmap[i]);
+	}
+
+	return 0;
+}
+
 static int dwc3_meson_g12a_probe(struct platform_device *pdev)
 {
 	struct dwc3_meson_g12a	*priv;
@@ -492,10 +539,12 @@ static int dwc3_meson_g12a_probe(struct platform_device *pdev)
 	if (IS_ERR(base))
 		return PTR_ERR(base);
 
-	priv->regmap = devm_regmap_init_mmio(dev, base,
-					     &phy_meson_g12a_usb3_regmap_conf);
-	if (IS_ERR(priv->regmap))
-		return PTR_ERR(priv->regmap);
+	priv->drvdata = of_device_get_match_data(&pdev->dev);
+
+	priv->dev = dev;
+	ret = priv->drvdata->setup_regmaps(priv, base);
+	if (ret)
+		return ret;
 
 	priv->vbus = devm_regulator_get_optional(dev, "vbus");
 	if (IS_ERR(priv->vbus)) {
@@ -504,8 +553,6 @@ static int dwc3_meson_g12a_probe(struct platform_device *pdev)
 		priv->vbus = NULL;
 	}
 
-	priv->drvdata = of_device_get_match_data(&pdev->dev);
-
 	ret = devm_clk_bulk_get(dev,
 				priv->drvdata->num_clks,
 				priv->drvdata->clks);
@@ -518,7 +565,6 @@ static int dwc3_meson_g12a_probe(struct platform_device *pdev)
 		return ret;
 
 	platform_set_drvdata(pdev, priv);
-	priv->dev = dev;
 
 	priv->reset = devm_reset_control_get(dev, NULL);
 	if (IS_ERR(priv->reset)) {