phy: meson: add GXBB PHY driver

This adds support for the USB PHY found on Amlogic GXBB SoCs.

Signed-off-by: Beniamino Galvani <b.galvani@gmail.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>

3 files changed, 244 insertions, 0 deletions

diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index a72f34f0d4..1e38c8741f 100644
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -154,6 +154,14 @@ config PHY_STM32_USBPHYC
 	  between an HS USB OTG controller and an HS USB Host controller,
 	  selected by an USB switch.
 
+config MESON_GXBB_USB_PHY
+	bool "Amlogic Meson GXBB USB PHY"
+	depends on PHY && ARCH_MESON && MESON_GXBB
+	imply REGMAP
+	help
+	  This is the generic phy driver for the Amlogic Meson GXBB
+	  USB2 PHY.
+
 config MESON_GXL_USB_PHY
 	bool "Amlogic Meson GXL USB PHYs"
 	depends on PHY && ARCH_MESON && (MESON_GXL || MESON_GXM)
diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
index 43ce62e08c..74e8d931d3 100644
--- a/drivers/phy/Makefile
+++ b/drivers/phy/Makefile
@@ -16,6 +16,7 @@ obj-$(CONFIG_STI_USB_PHY) += sti_usb_phy.o
 obj-$(CONFIG_PHY_RCAR_GEN2) += phy-rcar-gen2.o
 obj-$(CONFIG_PHY_RCAR_GEN3) += phy-rcar-gen3.o
 obj-$(CONFIG_PHY_STM32_USBPHYC) += phy-stm32-usbphyc.o
+obj-$(CONFIG_MESON_GXBB_USB_PHY) += meson-gxbb-usb2.o
 obj-$(CONFIG_MESON_GXL_USB_PHY) += meson-gxl-usb2.o meson-gxl-usb3.o
 obj-$(CONFIG_MESON_G12A_USB_PHY) += meson-g12a-usb2.o meson-g12a-usb3-pcie.o
 obj-$(CONFIG_MSM8916_USB_PHY) += msm8916-usbh-phy.o
diff --git a/drivers/phy/meson-gxbb-usb2.c b/drivers/phy/meson-gxbb-usb2.c
new file mode 100644
index 0000000000..88c2ec69b2
--- /dev/null
+++ b/drivers/phy/meson-gxbb-usb2.c
@@ -0,0 +1,235 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Meson8, Meson8b and GXBB USB2 PHY driver
+ *
+ * Copyright (C) 2016 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
+ * Copyright (C) 2018 BayLibre, SAS
+ *
+ * Author: Beniamino Galvani <b.galvani@gmail.com>
+ */
+
+#include <common.h>
+#include <clk.h>
+#include <dm.h>
+#include <generic-phy.h>
+#include <power/regulator.h>
+#include <regmap.h>
+#include <reset.h>
+
+#define REG_CONFIG					0x00
+	#define REG_CONFIG_CLK_EN			BIT(0)
+	#define REG_CONFIG_CLK_SEL_MASK			GENMASK(3, 1)
+	#define REG_CONFIG_CLK_DIV_MASK			GENMASK(10, 4)
+	#define REG_CONFIG_CLK_32k_ALTSEL		BIT(15)
+	#define REG_CONFIG_TEST_TRIG			BIT(31)
+
+#define REG_CTRL					0x04
+	#define REG_CTRL_SOFT_PRST			BIT(0)
+	#define REG_CTRL_SOFT_HRESET			BIT(1)
+	#define REG_CTRL_SS_SCALEDOWN_MODE_MASK		GENMASK(3, 2)
+	#define REG_CTRL_CLK_DET_RST			BIT(4)
+	#define REG_CTRL_INTR_SEL			BIT(5)
+	#define REG_CTRL_CLK_DETECTED			BIT(8)
+	#define REG_CTRL_SOF_SENT_RCVD_TGL		BIT(9)
+	#define REG_CTRL_SOF_TOGGLE_OUT			BIT(10)
+	#define REG_CTRL_POWER_ON_RESET			BIT(15)
+	#define REG_CTRL_SLEEPM				BIT(16)
+	#define REG_CTRL_TX_BITSTUFF_ENN_H		BIT(17)
+	#define REG_CTRL_TX_BITSTUFF_ENN		BIT(18)
+	#define REG_CTRL_COMMON_ON			BIT(19)
+	#define REG_CTRL_REF_CLK_SEL_MASK		GENMASK(21, 20)
+	#define REG_CTRL_REF_CLK_SEL_SHIFT		20
+	#define REG_CTRL_FSEL_MASK			GENMASK(24, 22)
+	#define REG_CTRL_FSEL_SHIFT			22
+	#define REG_CTRL_PORT_RESET			BIT(25)
+	#define REG_CTRL_THREAD_ID_MASK			GENMASK(31, 26)
+
+/* bits [31:26], [24:21] and [15:3] seem to be read-only */
+#define REG_ADP_BC					0x0c
+	#define REG_ADP_BC_VBUS_VLD_EXT_SEL		BIT(0)
+	#define REG_ADP_BC_VBUS_VLD_EXT			BIT(1)
+	#define REG_ADP_BC_OTG_DISABLE			BIT(2)
+	#define REG_ADP_BC_ID_PULLUP			BIT(3)
+	#define REG_ADP_BC_DRV_VBUS			BIT(4)
+	#define REG_ADP_BC_ADP_PRB_EN			BIT(5)
+	#define REG_ADP_BC_ADP_DISCHARGE		BIT(6)
+	#define REG_ADP_BC_ADP_CHARGE			BIT(7)
+	#define REG_ADP_BC_SESS_END			BIT(8)
+	#define REG_ADP_BC_DEVICE_SESS_VLD		BIT(9)
+	#define REG_ADP_BC_B_VALID			BIT(10)
+	#define REG_ADP_BC_A_VALID			BIT(11)
+	#define REG_ADP_BC_ID_DIG			BIT(12)
+	#define REG_ADP_BC_VBUS_VALID			BIT(13)
+	#define REG_ADP_BC_ADP_PROBE			BIT(14)
+	#define REG_ADP_BC_ADP_SENSE			BIT(15)
+	#define REG_ADP_BC_ACA_ENABLE			BIT(16)
+	#define REG_ADP_BC_DCD_ENABLE			BIT(17)
+	#define REG_ADP_BC_VDAT_DET_EN_B		BIT(18)
+	#define REG_ADP_BC_VDAT_SRC_EN_B		BIT(19)
+	#define REG_ADP_BC_CHARGE_SEL			BIT(20)
+	#define REG_ADP_BC_CHARGE_DETECT		BIT(21)
+	#define REG_ADP_BC_ACA_PIN_RANGE_C		BIT(22)
+	#define REG_ADP_BC_ACA_PIN_RANGE_B		BIT(23)
+	#define REG_ADP_BC_ACA_PIN_RANGE_A		BIT(24)
+	#define REG_ADP_BC_ACA_PIN_GND			BIT(25)
+	#define REG_ADP_BC_ACA_PIN_FLOAT		BIT(26)
+
+#define RESET_COMPLETE_TIME				500
+#define ACA_ENABLE_COMPLETE_TIME			50
+
+struct phy_meson_gxbb_usb2_priv {
+	struct regmap *regmap;
+	struct reset_ctl_bulk resets;
+#if CONFIG_IS_ENABLED(DM_REGULATOR)
+	struct udevice *phy_supply;
+#endif
+};
+
+static int phy_meson_gxbb_usb2_power_on(struct phy *phy)
+{
+	struct udevice *dev = phy->dev;
+	struct phy_meson_gxbb_usb2_priv *priv = dev_get_priv(dev);
+	uint val;
+
+#if CONFIG_IS_ENABLED(DM_REGULATOR)
+	if (priv->phy_supply) {
+		int ret = regulator_set_enable(priv->phy_supply, true);
+
+		if (ret)
+			return ret;
+	}
+#endif
+
+	regmap_update_bits(priv->regmap, REG_CONFIG,
+			   REG_CONFIG_CLK_32k_ALTSEL,
+			   REG_CONFIG_CLK_32k_ALTSEL);
+	regmap_update_bits(priv->regmap, REG_CTRL,
+			   REG_CTRL_REF_CLK_SEL_MASK,
+			   0x2 << REG_CTRL_REF_CLK_SEL_SHIFT);
+	regmap_update_bits(priv->regmap, REG_CTRL,
+			   REG_CTRL_FSEL_MASK,
+			   0x5 << REG_CTRL_FSEL_SHIFT);
+
+	/* reset the PHY */
+	regmap_update_bits(priv->regmap, REG_CTRL,
+			   REG_CTRL_POWER_ON_RESET,
+			   REG_CTRL_POWER_ON_RESET);
+	udelay(RESET_COMPLETE_TIME);
+	regmap_update_bits(priv->regmap, REG_CTRL,
+			   REG_CTRL_POWER_ON_RESET,
+			   0);
+	udelay(RESET_COMPLETE_TIME);
+
+	regmap_update_bits(priv->regmap, REG_CTRL,
+			   REG_CTRL_SOF_TOGGLE_OUT,
+			   REG_CTRL_SOF_TOGGLE_OUT);
+
+	/* Set host mode */
+	regmap_update_bits(priv->regmap, REG_ADP_BC,
+			   REG_ADP_BC_ACA_ENABLE,
+			   REG_ADP_BC_ACA_ENABLE);
+	udelay(ACA_ENABLE_COMPLETE_TIME);
+
+	regmap_read(priv->regmap, REG_ADP_BC, &val);
+	if (val & REG_ADP_BC_ACA_PIN_FLOAT) {
+		pr_err("Error powering on GXBB USB PHY\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int phy_meson_gxbb_usb2_power_off(struct phy *phy)
+{
+#if CONFIG_IS_ENABLED(DM_REGULATOR)
+	struct udevice *dev = phy->dev;
+	struct phy_meson_gxbb_usb2_priv *priv = dev_get_priv(dev);
+
+	if (priv->phy_supply) {
+		int ret = regulator_set_enable(priv->phy_supply, false);
+
+		if (ret)
+			return ret;
+	}
+#endif
+
+	return 0;
+}
+
+static struct phy_ops meson_gxbb_usb2_phy_ops = {
+	.power_on = phy_meson_gxbb_usb2_power_on,
+	.power_off = phy_meson_gxbb_usb2_power_off,
+};
+
+static int meson_gxbb_usb2_phy_probe(struct udevice *dev)
+{
+	struct phy_meson_gxbb_usb2_priv *priv = dev_get_priv(dev);
+	struct clk clk_usb_general, clk_usb;
+	int ret;
+
+	ret = regmap_init_mem(dev_ofnode(dev), &priv->regmap);
+	if (ret)
+		return ret;
+
+	ret = clk_get_by_name(dev, "usb_general", &clk_usb_general);
+	if (ret)
+		return ret;
+
+	ret = clk_enable(&clk_usb_general);
+	if (ret && ret != -ENOSYS && ret != -ENOTSUPP) {
+		pr_err("Failed to enable PHY general clock\n");
+		return ret;
+	}
+
+	ret = clk_get_by_name(dev, "usb", &clk_usb);
+	if (ret)
+		return ret;
+
+	ret = clk_enable(&clk_usb);
+	if (ret && ret != -ENOSYS && ret != -ENOTSUPP) {
+		pr_err("Failed to enable PHY clock\n");
+		return ret;
+	}
+
+#if CONFIG_IS_ENABLED(DM_REGULATOR)
+	ret = device_get_supply_regulator(dev, "phy-supply", &priv->phy_supply);
+	if (ret && ret != -ENOENT) {
+		pr_err("Failed to get PHY regulator\n");
+		return ret;
+	}
+#endif
+	ret = reset_get_bulk(dev, &priv->resets);
+	if (!ret) {
+		ret = reset_deassert_bulk(&priv->resets);
+		if (ret) {
+			pr_err("Failed to deassert reset\n");
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static int meson_gxbb_usb2_phy_remove(struct udevice *dev)
+{
+	struct phy_meson_gxbb_usb2_priv *priv = dev_get_priv(dev);
+
+	return reset_release_bulk(&priv->resets);
+}
+
+static const struct udevice_id meson_gxbb_usb2_phy_ids[] = {
+	{ .compatible = "amlogic,meson8-usb2-phy" },
+	{ .compatible = "amlogic,meson8b-usb2-phy" },
+	{ .compatible = "amlogic,meson-gxbb-usb2-phy" },
+	{ }
+};
+
+U_BOOT_DRIVER(meson_gxbb_usb2_phy) = {
+	.name = "meson_gxbb_usb2_phy",
+	.id = UCLASS_PHY,
+	.of_match = meson_gxbb_usb2_phy_ids,
+	.probe = meson_gxbb_usb2_phy_probe,
+	.remove = meson_gxbb_usb2_phy_remove,
+	.ops = &meson_gxbb_usb2_phy_ops,
+	.priv_auto_alloc_size = sizeof(struct phy_meson_gxbb_usb2_priv),
+};