1// SPDX-License-Identifier: GPL-2.0
  2#include <linux/module.h>
  3#include <linux/platform_device.h>
  4#include <linux/err.h>
  5#include <linux/of.h>
  6#include <linux/io.h>
  7#include <linux/delay.h>
  8#include <linux/usb/otg.h>
  9#include "phy-am335x-control.h"
 10
 11struct am335x_control_usb {
 12	struct device *dev;
 13	void __iomem *phy_reg;
 14	void __iomem *wkup;
 15	spinlock_t lock;
 16	struct phy_control phy_ctrl;
 17};
 18
 19#define AM335X_USB0_CTRL		0x0
 20#define AM335X_USB1_CTRL		0x8
 21#define AM335x_USB_WKUP			0x0
 22
 23#define USBPHY_CM_PWRDN		(1 << 0)
 24#define USBPHY_OTG_PWRDN	(1 << 1)
 25#define USBPHY_OTGVDET_EN	(1 << 19)
 26#define USBPHY_OTGSESSEND_EN	(1 << 20)
 27
 28#define AM335X_PHY0_WK_EN	(1 << 0)
 29#define AM335X_PHY1_WK_EN	(1 << 8)
 30
 31static void am335x_phy_wkup(struct  phy_control *phy_ctrl, u32 id, bool on)
 32{
 33	struct am335x_control_usb *usb_ctrl;
 34	u32 val;
 35	u32 reg;
 36
 37	usb_ctrl = container_of(phy_ctrl, struct am335x_control_usb, phy_ctrl);
 38
 39	switch (id) {
 40	case 0:
 41		reg = AM335X_PHY0_WK_EN;
 42		break;
 43	case 1:
 44		reg = AM335X_PHY1_WK_EN;
 45		break;
 46	default:
 47		WARN_ON(1);
 48		return;
 49	}
 50
 51	spin_lock(&usb_ctrl->lock);
 52	val = readl(usb_ctrl->wkup);
 53
 54	if (on)
 55		val |= reg;
 56	else
 57		val &= ~reg;
 58
 59	writel(val, usb_ctrl->wkup);
 60	spin_unlock(&usb_ctrl->lock);
 61}
 62
 63static void am335x_phy_power(struct phy_control *phy_ctrl, u32 id,
 64				enum usb_dr_mode dr_mode, bool on)
 65{
 66	struct am335x_control_usb *usb_ctrl;
 67	u32 val;
 68	u32 reg;
 69
 70	usb_ctrl = container_of(phy_ctrl, struct am335x_control_usb, phy_ctrl);
 71
 72	switch (id) {
 73	case 0:
 74		reg = AM335X_USB0_CTRL;
 75		break;
 76	case 1:
 77		reg = AM335X_USB1_CTRL;
 78		break;
 79	default:
 80		WARN_ON(1);
 81		return;
 82	}
 83
 84	val = readl(usb_ctrl->phy_reg + reg);
 85	if (on) {
 86		if (dr_mode == USB_DR_MODE_HOST) {
 87			val &= ~(USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN |
 88					USBPHY_OTGVDET_EN);
 89			val |= USBPHY_OTGSESSEND_EN;
 90		} else {
 91			val &= ~(USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN);
 92			val |= USBPHY_OTGVDET_EN | USBPHY_OTGSESSEND_EN;
 93		}
 94	} else {
 95		val |= USBPHY_CM_PWRDN | USBPHY_OTG_PWRDN;
 96	}
 97
 98	writel(val, usb_ctrl->phy_reg + reg);
 99
100	/*
101	 * Give the PHY ~1ms to complete the power up operation.
102	 * Tests have shown unstable behaviour if other USB PHY related
103	 * registers are written too shortly after such a transition.
104	 */
105	if (on)
106		mdelay(1);
107}
108
109static const struct phy_control ctrl_am335x = {
110	.phy_power = am335x_phy_power,
111	.phy_wkup = am335x_phy_wkup,
112};
113
114static const struct of_device_id omap_control_usb_id_table[] = {
115	{ .compatible = "ti,am335x-usb-ctrl-module", .data = &ctrl_am335x },
116	{}
117};
118MODULE_DEVICE_TABLE(of, omap_control_usb_id_table);
119
120static struct platform_driver am335x_control_driver;
121static int match(struct device *dev, const void *data)
122{
123	const struct device_node *node = (const struct device_node *)data;
124	return dev->of_node == node &&
125		dev->driver == &am335x_control_driver.driver;
126}
127
128struct phy_control *am335x_get_phy_control(struct device *dev)
129{
130	struct device_node *node;
131	struct am335x_control_usb *ctrl_usb;
132
133	node = of_parse_phandle(dev->of_node, "ti,ctrl_mod", 0);
134	if (!node)
135		return NULL;
136
137	dev = bus_find_device(&platform_bus_type, NULL, node, match);
138	of_node_put(node);
139	if (!dev)
140		return NULL;
141
142	ctrl_usb = dev_get_drvdata(dev);
143	put_device(dev);
144	if (!ctrl_usb)
145		return NULL;
146	return &ctrl_usb->phy_ctrl;
147}
148EXPORT_SYMBOL_GPL(am335x_get_phy_control);
149
150static int am335x_control_usb_probe(struct platform_device *pdev)
151{
152	struct am335x_control_usb *ctrl_usb;
153	const struct of_device_id *of_id;
154	const struct phy_control *phy_ctrl;
155
156	of_id = of_match_node(omap_control_usb_id_table, pdev->dev.of_node);
157	if (!of_id)
158		return -EINVAL;
159
160	phy_ctrl = of_id->data;
161
162	ctrl_usb = devm_kzalloc(&pdev->dev, sizeof(*ctrl_usb), GFP_KERNEL);
163	if (!ctrl_usb)
164		return -ENOMEM;
165
166	ctrl_usb->dev = &pdev->dev;
167
168	ctrl_usb->phy_reg = devm_platform_ioremap_resource_byname(pdev, "phy_ctrl");
169	if (IS_ERR(ctrl_usb->phy_reg))
170		return PTR_ERR(ctrl_usb->phy_reg);
171
172	ctrl_usb->wkup = devm_platform_ioremap_resource_byname(pdev, "wakeup");
173	if (IS_ERR(ctrl_usb->wkup))
174		return PTR_ERR(ctrl_usb->wkup);
175
176	spin_lock_init(&ctrl_usb->lock);
177	ctrl_usb->phy_ctrl = *phy_ctrl;
178
179	dev_set_drvdata(ctrl_usb->dev, ctrl_usb);
180	return 0;
181}
182
183static struct platform_driver am335x_control_driver = {
184	.probe		= am335x_control_usb_probe,
185	.driver		= {
186		.name	= "am335x-control-usb",
187		.of_match_table = omap_control_usb_id_table,
188	},
189};
190
191module_platform_driver(am335x_control_driver);
192MODULE_LICENSE("GPL v2");