From e73682ec4455c34f3f3edc7f40d90ed297521012 Mon Sep 17 00:00:00 2001
From: Senthilkumar N L <snlakshm@codeaurora.org>
Date: Tue, 6 Jan 2015 12:52:23 +0530
Subject: [PATCH] qcom: ipq4019: Add IPQ4019 USB HS/SS PHY drivers

These drivers handles control and configuration of the HS
and SS USB PHY transceivers.

Signed-off-by: Senthilkumar N L <snlakshm@codeaurora.org>
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>

---
Changed:
	- replaced spaces with tabs
	- remove emulation and host variables
---
 drivers/usb/phy/Kconfig          |  11 ++
 drivers/usb/phy/Makefile         |   2 +
 drivers/usb/phy/phy-qca-baldur.c | 233 +++++++++++++++++++++++++++++++++++++++
 drivers/usb/phy/phy-qca-uniphy.c | 141 +++++++++++++++++++++++
 4 files changed, 387 insertions(+)
 create mode 100644 drivers/usb/phy/phy-qca-baldur.c
 create mode 100644 drivers/usb/phy/phy-qca-uniphy.c

--- a/drivers/usb/phy/Kconfig
+++ b/drivers/usb/phy/Kconfig
@@ -194,6 +194,17 @@ config USB_MXS_PHY
 
 	  MXS Phy is used by some of the i.MX SoCs, for example imx23/28/6x.
 
+config USB_IPQ4019_PHY
+	tristate "IPQ4019 PHY wrappers support"
+	depends on (USB || USB_GADGET) && ARCH_QCOM
+	select USB_PHY
+	help
+	  Enable this to support the USB PHY transceivers on QCA961x chips.
+	  It handles PHY initialization, clock management required after
+	  resetting the hardware and power management.
+	  This driver is required even for peripheral only or host only
+	  mode configurations.
+
 config USB_ULPI
 	bool "Generic ULPI Transceiver Driver"
 	depends on ARM || ARM64
--- a/drivers/usb/phy/Makefile
+++ b/drivers/usb/phy/Makefile
@@ -21,6 +21,8 @@ obj-$(CONFIG_USB_GPIO_VBUS)		+= phy-gpio
 obj-$(CONFIG_USB_ISP1301)		+= phy-isp1301.o
 obj-$(CONFIG_USB_MSM_OTG)		+= phy-msm-usb.o
 obj-$(CONFIG_USB_QCOM_8X16_PHY)	+= phy-qcom-8x16-usb.o
+obj-$(CONFIG_USB_IPQ4019_PHY)		+= phy-qca-baldur.o
+obj-$(CONFIG_USB_IPQ4019_PHY)		+= phy-qca-uniphy.o
 obj-$(CONFIG_USB_MV_OTG)		+= phy-mv-usb.o
 obj-$(CONFIG_USB_MXS_PHY)		+= phy-mxs-usb.o
 obj-$(CONFIG_USB_ULPI)			+= phy-ulpi.o
--- /dev/null
+++ b/drivers/usb/phy/phy-qca-baldur.c
@@ -0,0 +1,233 @@
+/* Copyright (c) 2015, The Linux Foundation. All rights reserved.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ */
+
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+#include <linux/usb/phy.h>
+#include <linux/reset.h>
+#include <linux/of_device.h>
+
+/**
+ *  USB Hardware registers
+ */
+#define PHY_CTRL0_ADDR	0x000
+#define PHY_CTRL1_ADDR	0x004
+#define PHY_CTRL2_ADDR	0x008
+#define PHY_CTRL3_ADDR	0x00C
+#define PHY_CTRL4_ADDR	0x010
+#define PHY_MISC_ADDR	0x024
+#define PHY_IPG_ADDR	0x030
+
+#define PHY_CTRL0_VAL	0xA4600015
+#define PHY_CTRL1_VAL	0x09500000
+#define PHY_CTRL2_VAL	0x00058180
+#define PHY_CTRL3_VAL	0x6DB6DCD6
+#define PHY_CTRL4_VAL	0x836DB6DB
+#define PHY_MISC_VAL	0x3803FB0C
+#define PHY_IPG_VAL	0x47323232
+
+#define USB30_HS_PHY_HOST_MODE	(0x01 << 21)
+#define USB20_HS_PHY_HOST_MODE	(0x01 << 5)
+
+/* used to differentiate between USB3 HS and USB2 HS PHY */
+struct qca_baldur_hs_data {
+	unsigned int usb3_hs_phy;
+	unsigned int phy_config_offset;
+};
+
+struct qca_baldur_hs_phy {
+	struct device *dev;
+	struct usb_phy phy;
+
+	void __iomem *base;
+	void __iomem *qscratch_base;
+
+	struct reset_control *por_rst;
+	struct reset_control *srif_rst;
+
+	const struct qca_baldur_hs_data *data;
+};
+
+#define phy_to_dw_phy(x) container_of((x), struct qca_baldur_hs_phy, phy)
+
+static int qca_baldur_phy_read(struct usb_phy *x, u32 reg)
+{
+	struct qca_baldur_hs_phy *phy = phy_to_dw_phy(x);
+
+	return readl(phy->base + reg);
+}
+
+static int qca_baldur_phy_write(struct usb_phy *x, u32 val, u32 reg)
+{
+	struct qca_baldur_hs_phy *phy = phy_to_dw_phy(x);
+
+	writel(val, phy->base + reg);
+	return 0;
+}
+
+static int qca_baldur_hs_phy_init(struct usb_phy *x)
+{
+	struct qca_baldur_hs_phy *phy = phy_to_dw_phy(x);
+
+	/* assert HS PHY POR reset */
+	reset_control_assert(phy->por_rst);
+	msleep(10);
+
+	/* assert HS PHY SRIF reset */
+	reset_control_assert(phy->srif_rst);
+	msleep(10);
+
+	/* deassert HS PHY SRIF reset and program HS PHY registers */
+	reset_control_deassert(phy->srif_rst);
+	msleep(10);
+
+	/* perform PHY register writes */
+	writel(PHY_CTRL0_VAL, phy->base + PHY_CTRL0_ADDR);
+	writel(PHY_CTRL1_VAL, phy->base + PHY_CTRL1_ADDR);
+	writel(PHY_CTRL2_VAL, phy->base + PHY_CTRL2_ADDR);
+	writel(PHY_CTRL3_VAL, phy->base + PHY_CTRL3_ADDR);
+	writel(PHY_CTRL4_VAL, phy->base + PHY_CTRL4_ADDR);
+	writel(PHY_MISC_VAL, phy->base + PHY_MISC_ADDR);
+	writel(PHY_IPG_VAL, phy->base + PHY_IPG_ADDR);
+
+	msleep(10);
+
+	/* de-assert USB3 HS PHY POR reset */
+	reset_control_deassert(phy->por_rst);
+
+	return 0;
+}
+
+static int qca_baldur_hs_get_resources(struct qca_baldur_hs_phy *phy)
+{
+	struct platform_device *pdev = to_platform_device(phy->dev);
+	struct resource *res;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	phy->base = devm_ioremap_resource(phy->dev, res);
+	if (IS_ERR(phy->base))
+		return PTR_ERR(phy->base);
+
+	phy->por_rst = devm_reset_control_get(phy->dev, "por_rst");
+	if (IS_ERR(phy->por_rst))
+		return PTR_ERR(phy->por_rst);
+
+	phy->srif_rst = devm_reset_control_get(phy->dev, "srif_rst");
+	if (IS_ERR(phy->srif_rst))
+		return PTR_ERR(phy->srif_rst);
+
+	return 0;
+}
+
+static void qca_baldur_hs_put_resources(struct qca_baldur_hs_phy *phy)
+{
+	reset_control_assert(phy->srif_rst);
+	reset_control_assert(phy->por_rst);
+}
+
+static int qca_baldur_hs_remove(struct platform_device *pdev)
+{
+	struct qca_baldur_hs_phy *phy = platform_get_drvdata(pdev);
+
+	usb_remove_phy(&phy->phy);
+	return 0;
+}
+
+static void qca_baldur_hs_phy_shutdown(struct usb_phy *x)
+{
+	struct qca_baldur_hs_phy *phy = phy_to_dw_phy(x);
+
+	qca_baldur_hs_put_resources(phy);
+}
+
+static struct usb_phy_io_ops qca_baldur_io_ops = {
+	.read = qca_baldur_phy_read,
+	.write = qca_baldur_phy_write,
+};
+
+static const struct qca_baldur_hs_data usb3_hs_data = {
+	.usb3_hs_phy = 1,
+	.phy_config_offset = USB30_HS_PHY_HOST_MODE,
+};
+
+static const struct qca_baldur_hs_data usb2_hs_data = {
+	.usb3_hs_phy = 0,
+	.phy_config_offset = USB20_HS_PHY_HOST_MODE,
+};
+
+static const struct of_device_id qca_baldur_hs_id_table[] = {
+	{ .compatible = "qca,baldur-usb3-hsphy", .data = &usb3_hs_data },
+	{ .compatible = "qca,baldur-usb2-hsphy", .data = &usb2_hs_data },
+	{ /* Sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, qca_baldur_hs_id_table);
+
+static int qca_baldur_hs_probe(struct platform_device *pdev)
+{
+	const struct of_device_id *match;
+	struct qca_baldur_hs_phy *phy;
+	int err;
+
+	match = of_match_device(qca_baldur_hs_id_table, &pdev->dev);
+	if (!match)
+		return -ENODEV;
+
+	phy = devm_kzalloc(&pdev->dev, sizeof(*phy), GFP_KERNEL);
+	if (!phy)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, phy);
+	phy->dev = &pdev->dev;
+
+	phy->data = match->data;
+
+	err = qca_baldur_hs_get_resources(phy);
+	if (err < 0) {
+		dev_err(&pdev->dev, "failed to request resources: %d\n", err);
+		return err;
+	}
+
+	phy->phy.dev = phy->dev;
+	phy->phy.label = "qca-baldur-hsphy";
+	phy->phy.init = qca_baldur_hs_phy_init;
+	phy->phy.shutdown = qca_baldur_hs_phy_shutdown;
+	phy->phy.type = USB_PHY_TYPE_USB2;
+	phy->phy.io_ops = &qca_baldur_io_ops;
+
+	err = usb_add_phy_dev(&phy->phy);
+	return err;
+}
+
+static struct platform_driver qca_baldur_hs_driver = {
+	.probe		= qca_baldur_hs_probe,
+	.remove		= qca_baldur_hs_remove,
+	.driver		= {
+		.name	= "qca-baldur-hsphy",
+		.owner	= THIS_MODULE,
+		.of_match_table = qca_baldur_hs_id_table,
+	},
+};
+
+module_platform_driver(qca_baldur_hs_driver);
+
+MODULE_ALIAS("platform:qca-baldur-hsphy");
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_DESCRIPTION("USB3 QCA BALDUR HSPHY driver");
--- /dev/null
+++ b/drivers/usb/phy/phy-qca-uniphy.c
@@ -0,0 +1,135 @@
+/* Copyright (c) 2015, The Linux Foundation. All rights reserved.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ */
+
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+#include <linux/usb/phy.h>
+#include <linux/reset.h>
+#include <linux/of_device.h>
+
+struct qca_uni_ss_phy {
+	struct usb_phy phy;
+	struct device *dev;
+
+	void __iomem *base;
+
+	struct reset_control *por_rst;
+};
+
+#define phy_to_dw_phy(x) container_of((x), struct qca_uni_ss_phy, phy)
+
+static void qca_uni_ss_phy_shutdown(struct usb_phy *x)
+{
+	struct qca_uni_ss_phy *phy = phy_to_dw_phy(x);
+
+	/* assert SS PHY POR reset */
+	reset_control_assert(phy->por_rst);
+}
+
+static int qca_uni_ss_phy_init(struct usb_phy *x)
+{
+	struct qca_uni_ss_phy *phy = phy_to_dw_phy(x);
+
+	/* assert SS PHY POR reset */
+	reset_control_assert(phy->por_rst);
+
+	msleep(20);
+
+	/* deassert SS PHY POR reset */
+	reset_control_deassert(phy->por_rst);
+
+	return 0;
+}
+
+static int qca_uni_ss_get_resources(struct platform_device *pdev,
+		struct qca_uni_ss_phy *phy)
+{
+	struct resource *res;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	phy->base = devm_ioremap_resource(phy->dev, res);
+	if (IS_ERR(phy->base))
+		return PTR_ERR(phy->base);
+
+	phy->por_rst = devm_reset_control_get(phy->dev, "por_rst");
+	if (IS_ERR(phy->por_rst))
+		return PTR_ERR(phy->por_rst);
+
+	return 0;
+}
+
+static int qca_uni_ss_remove(struct platform_device *pdev)
+{
+	struct qca_uni_ss_phy *phy = platform_get_drvdata(pdev);
+
+	usb_remove_phy(&phy->phy);
+	return 0;
+}
+
+static const struct of_device_id qca_uni_ss_id_table[] = {
+	{ .compatible = "qca,uni-ssphy" },
+	{ /* Sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, qca_uni_ss_id_table);
+
+static int qca_uni_ss_probe(struct platform_device *pdev)
+{
+	struct qca_uni_ss_phy *phy;
+	int ret;
+
+	phy = devm_kzalloc(&pdev->dev, sizeof(*phy), GFP_KERNEL);
+	if (!phy)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, phy);
+	phy->dev = &pdev->dev;
+
+	ret = qca_uni_ss_get_resources(pdev, phy);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "failed to request resources: %d\n", ret);
+		return ret;
+	}
+
+	phy->phy.dev = phy->dev;
+	phy->phy.label = "qca-uni-ssphy";
+	phy->phy.init = qca_uni_ss_phy_init;
+	phy->phy.shutdown = qca_uni_ss_phy_shutdown;
+	phy->phy.type = USB_PHY_TYPE_USB3;
+
+	ret = usb_add_phy_dev(&phy->phy);
+	return ret;
+}
+
+static struct platform_driver qca_uni_ss_driver = {
+	.probe = qca_uni_ss_probe,
+	.remove	= qca_uni_ss_remove,
+	.driver = {
+		.name = "qca-uni-ssphy",
+		.owner = THIS_MODULE,
+		.of_match_table = qca_uni_ss_id_table,
+	},
+};
+
+module_platform_driver(qca_uni_ss_driver);
+
+MODULE_ALIAS("platform:qca-uni-ssphy");
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_DESCRIPTION("USB3 QCA UNI SSPHY driver");
