2 * Rockchip usb PHY driver
4 * Copyright (C) 2014 Yunzhi Li <lyz@rock-chips.com>
5 * Copyright (C) 2014 ROCKCHIP, Inc.
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
17 #include <linux/clk.h>
19 #include <linux/kernel.h>
20 #include <linux/module.h>
21 #include <linux/mutex.h>
23 #include <linux/of_address.h>
24 #include <linux/of_platform.h>
25 #include <linux/phy/phy.h>
26 #include <linux/platform_device.h>
27 #include <linux/regulator/consumer.h>
28 #include <linux/reset.h>
29 #include <linux/regmap.h>
30 #include <linux/mfd/syscon.h>
33 * The higher 16-bit of this register is used for write protection
34 * only if BIT(13 + 16) set to 1 the BIT(13) can be written.
36 #define SIDDQ_WRITE_ENA BIT(29)
37 #define SIDDQ_ON BIT(13)
38 #define SIDDQ_OFF (0 << 13)
40 struct rockchip_usb_phy {
41 unsigned int reg_offset;
42 struct regmap *reg_base;
45 int (*rk_usb_phy_power)(struct rockchip_usb_phy *phy, bool on);
48 static int rk32_usb_phy_power(struct rockchip_usb_phy *phy,
51 /* Power down usb phy analog blocks by set siddq 1 */
54 return regmap_write(phy->reg_base, phy->reg_offset,
55 SIDDQ_WRITE_ENA | (siddq ? SIDDQ_ON : SIDDQ_OFF));
58 static int rk33_usb_phy_power(struct rockchip_usb_phy *phy,
62 return regmap_write(phy->reg_base, phy->reg_offset, 0xffff0000);
64 return regmap_write(phy->reg_base, phy->reg_offset, 0xffff01d5);
67 static int rockchip_usb_phy_power_off(struct phy *_phy)
69 struct rockchip_usb_phy *phy = phy_get_drvdata(_phy);
72 ret = phy->rk_usb_phy_power(phy, 0);
76 clk_disable_unprepare(phy->clk);
83 static int rockchip_usb_phy_power_on(struct phy *_phy)
85 struct rockchip_usb_phy *phy = phy_get_drvdata(_phy);
88 ret = clk_prepare_enable(phy->clk);
92 /* Power up usb phy analog blocks by set siddq 0 */
93 ret = phy->rk_usb_phy_power(phy, 1);
100 static struct phy_ops ops = {
101 .power_on = rockchip_usb_phy_power_on,
102 .power_off = rockchip_usb_phy_power_off,
103 .owner = THIS_MODULE,
106 static const struct of_device_id rockchip_usb_phy_dt_ids[] = {
108 .compatible = "rockchip,rk3288-usb-phy",
109 .data = (void *)rk32_usb_phy_power
112 .compatible = "rockchip,rk3368-usb-phy",
113 .data = (void *)rk33_usb_phy_power
118 static int rockchip_usb_phy_probe(struct platform_device *pdev)
120 struct device *dev = &pdev->dev;
121 struct rockchip_usb_phy *rk_phy;
122 struct phy_provider *phy_provider;
123 struct device_node *child;
125 const struct of_device_id *match;
126 unsigned int reg_offset;
127 int (*rk_usb_phy_power)(struct rockchip_usb_phy *phy, bool siddq);
129 grf = syscon_regmap_lookup_by_phandle(dev->of_node, "rockchip,grf");
131 dev_err(&pdev->dev, "Missing rockchip,grf property\n");
135 match = of_match_device(rockchip_usb_phy_dt_ids, &pdev->dev);
136 if (match && match->data)
137 rk_usb_phy_power = match->data;
139 return PTR_ERR(match);
141 for_each_available_child_of_node(dev->of_node, child) {
142 rk_phy = devm_kzalloc(dev, sizeof(*rk_phy), GFP_KERNEL);
146 if (of_property_read_u32(child, "reg", ®_offset)) {
147 dev_err(dev, "missing reg property in node %s\n",
152 rk_phy->rk_usb_phy_power = rk_usb_phy_power;
153 rk_phy->reg_offset = reg_offset;
154 rk_phy->reg_base = grf;
156 rk_phy->clk = of_clk_get_by_name(child, "phyclk");
157 if (IS_ERR(rk_phy->clk))
160 rk_phy->phy = devm_phy_create(dev, child, &ops);
161 if (IS_ERR(rk_phy->phy)) {
162 dev_err(dev, "failed to create PHY\n");
163 return PTR_ERR(rk_phy->phy);
165 phy_set_drvdata(rk_phy->phy, rk_phy);
168 phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
169 if (IS_ERR(phy_provider))
170 return (long)phy_provider;
175 MODULE_DEVICE_TABLE(of, rockchip_usb_phy_dt_ids);
177 static struct platform_driver rockchip_usb_driver = {
178 .probe = rockchip_usb_phy_probe,
180 .name = "rockchip-usb-phy",
181 .owner = THIS_MODULE,
182 .of_match_table = rockchip_usb_phy_dt_ids,
186 module_platform_driver(rockchip_usb_driver);
188 MODULE_AUTHOR("Yunzhi Li <lyz@rock-chips.com>");
189 MODULE_DESCRIPTION("Rockchip USB 2.0 PHY driver");
190 MODULE_LICENSE("GPL v2");