Initial import

1 files changed, 338 insertions, 0 deletions

diff --git a/drivers/phy/phy-sun4i-usb.c b/drivers/phy/phy-sun4i-usb.c
new file mode 100644
index 000000000..a2b08f3cc
--- /dev/null
+++ b/drivers/phy/phy-sun4i-usb.c
@@ -0,0 +1,338 @@
+/*
+ * Allwinner sun4i USB phy driver
+ *
+ * Copyright (C) 2014 Hans de Goede <hdegoede@redhat.com>
+ *
+ * Based on code from
+ * Allwinner Technology Co., Ltd. <www.allwinnertech.com>
+ *
+ * Modelled after: Samsung S5P/EXYNOS SoC series MIPI CSIS/DSIM DPHY driver
+ * Copyright (C) 2013 Samsung Electronics Co., Ltd.
+ * Author: Sylwester Nawrocki <s.nawrocki@samsung.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+#include <linux/reset.h>
+
+#define REG_ISCR			0x00
+#define REG_PHYCTL			0x04
+#define REG_PHYBIST			0x08
+#define REG_PHYTUNE			0x0c
+
+#define PHYCTL_DATA			BIT(7)
+
+#define SUNXI_AHB_ICHR8_EN		BIT(10)
+#define SUNXI_AHB_INCR4_BURST_EN	BIT(9)
+#define SUNXI_AHB_INCRX_ALIGN_EN	BIT(8)
+#define SUNXI_ULPI_BYPASS_EN		BIT(0)
+
+/* Common Control Bits for Both PHYs */
+#define PHY_PLL_BW			0x03
+#define PHY_RES45_CAL_EN		0x0c
+
+/* Private Control Bits for Each PHY */
+#define PHY_TX_AMPLITUDE_TUNE		0x20
+#define PHY_TX_SLEWRATE_TUNE		0x22
+#define PHY_VBUSVALID_TH_SEL		0x25
+#define PHY_PULLUP_RES_SEL		0x27
+#define PHY_OTG_FUNC_EN			0x28
+#define PHY_VBUS_DET_EN			0x29
+#define PHY_DISCON_TH_SEL		0x2a
+
+#define MAX_PHYS			3
+
+struct sun4i_usb_phy_data {
+	void __iomem *base;
+	struct mutex mutex;
+	int num_phys;
+	u32 disc_thresh;
+	struct sun4i_usb_phy {
+		struct phy *phy;
+		void __iomem *pmu;
+		struct regulator *vbus;
+		struct reset_control *reset;
+		struct clk *clk;
+		int index;
+	} phys[MAX_PHYS];
+};
+
+#define to_sun4i_usb_phy_data(phy) \
+	container_of((phy), struct sun4i_usb_phy_data, phys[(phy)->index])
+
+static void sun4i_usb_phy_write(struct sun4i_usb_phy *phy, u32 addr, u32 data,
+				int len)
+{
+	struct sun4i_usb_phy_data *phy_data = to_sun4i_usb_phy_data(phy);
+	u32 temp, usbc_bit = BIT(phy->index * 2);
+	int i;
+
+	mutex_lock(&phy_data->mutex);
+
+	for (i = 0; i < len; i++) {
+		temp = readl(phy_data->base + REG_PHYCTL);
+
+		/* clear the address portion */
+		temp &= ~(0xff << 8);
+
+		/* set the address */
+		temp |= ((addr + i) << 8);
+		writel(temp, phy_data->base + REG_PHYCTL);
+
+		/* set the data bit and clear usbc bit*/
+		temp = readb(phy_data->base + REG_PHYCTL);
+		if (data & 0x1)
+			temp |= PHYCTL_DATA;
+		else
+			temp &= ~PHYCTL_DATA;
+		temp &= ~usbc_bit;
+		writeb(temp, phy_data->base + REG_PHYCTL);
+
+		/* pulse usbc_bit */
+		temp = readb(phy_data->base + REG_PHYCTL);
+		temp |= usbc_bit;
+		writeb(temp, phy_data->base + REG_PHYCTL);
+
+		temp = readb(phy_data->base + REG_PHYCTL);
+		temp &= ~usbc_bit;
+		writeb(temp, phy_data->base + REG_PHYCTL);
+
+		data >>= 1;
+	}
+	mutex_unlock(&phy_data->mutex);
+}
+
+static void sun4i_usb_phy_passby(struct sun4i_usb_phy *phy, int enable)
+{
+	u32 bits, reg_value;
+
+	if (!phy->pmu)
+		return;
+
+	bits = SUNXI_AHB_ICHR8_EN | SUNXI_AHB_INCR4_BURST_EN |
+		SUNXI_AHB_INCRX_ALIGN_EN | SUNXI_ULPI_BYPASS_EN;
+
+	reg_value = readl(phy->pmu);
+
+	if (enable)
+		reg_value |= bits;
+	else
+		reg_value &= ~bits;
+
+	writel(reg_value, phy->pmu);
+}
+
+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;
+
+	ret = clk_prepare_enable(phy->clk);
+	if (ret)
+		return ret;
+
+	ret = reset_control_deassert(phy->reset);
+	if (ret) {
+		clk_disable_unprepare(phy->clk);
+		return ret;
+	}
+
+	/* 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);
+
+	/* Disconnect threshold adjustment */
+	sun4i_usb_phy_write(phy, PHY_DISCON_TH_SEL, data->disc_thresh, 2);
+
+	sun4i_usb_phy_passby(phy, 1);
+
+	return 0;
+}
+
+static int sun4i_usb_phy_exit(struct phy *_phy)
+{
+	struct sun4i_usb_phy *phy = phy_get_drvdata(_phy);
+
+	sun4i_usb_phy_passby(phy, 0);
+	reset_control_assert(phy->reset);
+	clk_disable_unprepare(phy->clk);
+
+	return 0;
+}
+
+static int sun4i_usb_phy_power_on(struct phy *_phy)
+{
+	struct sun4i_usb_phy *phy = phy_get_drvdata(_phy);
+	int ret = 0;
+
+	if (phy->vbus)
+		ret = regulator_enable(phy->vbus);
+
+	return ret;
+}
+
+static int sun4i_usb_phy_power_off(struct phy *_phy)
+{
+	struct sun4i_usb_phy *phy = phy_get_drvdata(_phy);
+
+	if (phy->vbus)
+		regulator_disable(phy->vbus);
+
+	return 0;
+}
+
+static struct phy_ops sun4i_usb_phy_ops = {
+	.init		= sun4i_usb_phy_init,
+	.exit		= sun4i_usb_phy_exit,
+	.power_on	= sun4i_usb_phy_power_on,
+	.power_off	= sun4i_usb_phy_power_off,
+	.owner		= THIS_MODULE,
+};
+
+static struct phy *sun4i_usb_phy_xlate(struct device *dev,
+					struct of_phandle_args *args)
+{
+	struct sun4i_usb_phy_data *data = dev_get_drvdata(dev);
+
+	if (args->args[0] >= data->num_phys)
+		return ERR_PTR(-ENODEV);
+
+	return data->phys[args->args[0]].phy;
+}
+
+static int sun4i_usb_phy_probe(struct platform_device *pdev)
+{
+	struct sun4i_usb_phy_data *data;
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
+	struct phy_provider *phy_provider;
+	bool dedicated_clocks;
+	struct resource *res;
+	int i;
+
+	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	mutex_init(&data->mutex);
+
+	if (of_device_is_compatible(np, "allwinner,sun5i-a13-usb-phy"))
+		data->num_phys = 2;
+	else
+		data->num_phys = 3;
+
+	if (of_device_is_compatible(np, "allwinner,sun4i-a10-usb-phy") ||
+	    of_device_is_compatible(np, "allwinner,sun6i-a31-usb-phy"))
+		data->disc_thresh = 3;
+	else
+		data->disc_thresh = 2;
+
+	if (of_device_is_compatible(np, "allwinner,sun6i-a31-usb-phy"))
+		dedicated_clocks = true;
+	else
+		dedicated_clocks = false;
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy_ctrl");
+	data->base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(data->base))
+		return PTR_ERR(data->base);
+
+	for (i = 0; i < data->num_phys; i++) {
+		struct sun4i_usb_phy *phy = data->phys + i;
+		char name[16];
+
+		snprintf(name, sizeof(name), "usb%d_vbus", i);
+		phy->vbus = devm_regulator_get_optional(dev, name);
+		if (IS_ERR(phy->vbus)) {
+			if (PTR_ERR(phy->vbus) == -EPROBE_DEFER)
+				return -EPROBE_DEFER;
+			phy->vbus = NULL;
+		}
+
+		if (dedicated_clocks)
+			snprintf(name, sizeof(name), "usb%d_phy", i);
+		else
+			strlcpy(name, "usb_phy", sizeof(name));
+
+		phy->clk = devm_clk_get(dev, name);
+		if (IS_ERR(phy->clk)) {
+			dev_err(dev, "failed to get clock %s\n", name);
+			return PTR_ERR(phy->clk);
+		}
+
+		snprintf(name, sizeof(name), "usb%d_reset", i);
+		phy->reset = devm_reset_control_get(dev, name);
+		if (IS_ERR(phy->reset)) {
+			dev_err(dev, "failed to get reset %s\n", name);
+			return PTR_ERR(phy->reset);
+		}
+
+		if (i) { /* No pmu for usbc0 */
+			snprintf(name, sizeof(name), "pmu%d", i);
+			res = platform_get_resource_byname(pdev,
+							IORESOURCE_MEM, name);
+			phy->pmu = devm_ioremap_resource(dev, res);
+			if (IS_ERR(phy->pmu))
+				return PTR_ERR(phy->pmu);
+		}
+
+		phy->phy = devm_phy_create(dev, NULL, &sun4i_usb_phy_ops);
+		if (IS_ERR(phy->phy)) {
+			dev_err(dev, "failed to create PHY %d\n", i);
+			return PTR_ERR(phy->phy);
+		}
+
+		phy->index = i;
+		phy_set_drvdata(phy->phy, &data->phys[i]);
+	}
+
+	dev_set_drvdata(dev, data);
+	phy_provider = devm_of_phy_provider_register(dev, sun4i_usb_phy_xlate);
+
+	return PTR_ERR_OR_ZERO(phy_provider);
+}
+
+static const struct of_device_id sun4i_usb_phy_of_match[] = {
+	{ .compatible = "allwinner,sun4i-a10-usb-phy" },
+	{ .compatible = "allwinner,sun5i-a13-usb-phy" },
+	{ .compatible = "allwinner,sun6i-a31-usb-phy" },
+	{ .compatible = "allwinner,sun7i-a20-usb-phy" },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, sun4i_usb_phy_of_match);
+
+static struct platform_driver sun4i_usb_phy_driver = {
+	.probe	= sun4i_usb_phy_probe,
+	.driver = {
+		.of_match_table	= sun4i_usb_phy_of_match,
+		.name  = "sun4i-usb-phy",
+	}
+};
+module_platform_driver(sun4i_usb_phy_driver);
+
+MODULE_DESCRIPTION("Allwinner sun4i USB phy driver");
+MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
+MODULE_LICENSE("GPL v2");