2 * Samsung SoC USB 1.1/2.0 PHY driver
4 * Copyright (C) 2013 Samsung Electronics Co., Ltd.
5 * Author: Kamil Debski <k.debski@samsung.com>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 #include <linux/clk.h>
13 #include <linux/mfd/syscon.h>
14 #include <linux/module.h>
16 #include <linux/of_address.h>
17 #include <linux/phy/phy.h>
18 #include <linux/platform_device.h>
19 #include <linux/spinlock.h>
20 #include "phy-samsung-usb2.h"
22 static int samsung_usb2_phy_power_on(struct phy
*phy
)
24 struct samsung_usb2_phy_instance
*inst
= phy_get_drvdata(phy
);
25 struct samsung_usb2_phy_driver
*drv
= inst
->drv
;
28 dev_dbg(drv
->dev
, "Request to power_on \"%s\" usb phy\n",
30 ret
= clk_prepare_enable(drv
->clk
);
33 ret
= clk_prepare_enable(drv
->ref_clk
);
35 goto err_instance_clk
;
36 if (inst
->cfg
->power_on
) {
37 spin_lock(&drv
->lock
);
38 ret
= inst
->cfg
->power_on(inst
);
39 spin_unlock(&drv
->lock
);
45 clk_disable_unprepare(drv
->clk
);
50 static int samsung_usb2_phy_power_off(struct phy
*phy
)
52 struct samsung_usb2_phy_instance
*inst
= phy_get_drvdata(phy
);
53 struct samsung_usb2_phy_driver
*drv
= inst
->drv
;
56 dev_dbg(drv
->dev
, "Request to power_off \"%s\" usb phy\n",
58 if (inst
->cfg
->power_off
) {
59 spin_lock(&drv
->lock
);
60 ret
= inst
->cfg
->power_off(inst
);
61 spin_unlock(&drv
->lock
);
63 clk_disable_unprepare(drv
->ref_clk
);
64 clk_disable_unprepare(drv
->clk
);
68 static struct phy_ops samsung_usb2_phy_ops
= {
69 .power_on
= samsung_usb2_phy_power_on
,
70 .power_off
= samsung_usb2_phy_power_off
,
74 static struct phy
*samsung_usb2_phy_xlate(struct device
*dev
,
75 struct of_phandle_args
*args
)
77 struct samsung_usb2_phy_driver
*drv
;
79 drv
= dev_get_drvdata(dev
);
81 return ERR_PTR(-EINVAL
);
83 if (WARN_ON(args
->args
[0] >= drv
->cfg
->num_phys
))
84 return ERR_PTR(-ENODEV
);
86 return drv
->instances
[args
->args
[0]].phy
;
89 static const struct of_device_id samsung_usb2_phy_of_match
[] = {
90 #ifdef CONFIG_PHY_EXYNOS4210_USB2
92 .compatible
= "samsung,exynos4210-usb2-phy",
93 .data
= &exynos4210_usb2_phy_config
,
96 #ifdef CONFIG_PHY_EXYNOS4X12_USB2
98 .compatible
= "samsung,exynos4x12-usb2-phy",
99 .data
= &exynos4x12_usb2_phy_config
,
102 #ifdef CONFIG_PHY_EXYNOS5250_USB2
104 .compatible
= "samsung,exynos5250-usb2-phy",
105 .data
= &exynos5250_usb2_phy_config
,
111 static int samsung_usb2_phy_probe(struct platform_device
*pdev
)
113 const struct of_device_id
*match
;
114 const struct samsung_usb2_phy_config
*cfg
;
115 struct device
*dev
= &pdev
->dev
;
116 struct phy_provider
*phy_provider
;
117 struct resource
*mem
;
118 struct samsung_usb2_phy_driver
*drv
;
121 if (!pdev
->dev
.of_node
) {
122 dev_err(dev
, "This driver is required to be instantiated from device tree\n");
126 match
= of_match_node(samsung_usb2_phy_of_match
, pdev
->dev
.of_node
);
128 dev_err(dev
, "of_match_node() failed\n");
133 drv
= devm_kzalloc(dev
, sizeof(struct samsung_usb2_phy_driver
) +
134 cfg
->num_phys
* sizeof(struct samsung_usb2_phy_instance
),
139 dev_set_drvdata(dev
, drv
);
140 spin_lock_init(&drv
->lock
);
145 mem
= platform_get_resource(pdev
, IORESOURCE_MEM
, 0);
146 drv
->reg_phy
= devm_ioremap_resource(dev
, mem
);
147 if (IS_ERR(drv
->reg_phy
)) {
148 dev_err(dev
, "Failed to map register memory (phy)\n");
149 return PTR_ERR(drv
->reg_phy
);
152 drv
->reg_pmu
= syscon_regmap_lookup_by_phandle(pdev
->dev
.of_node
,
153 "samsung,pmureg-phandle");
154 if (IS_ERR(drv
->reg_pmu
)) {
155 dev_err(dev
, "Failed to map PMU registers (via syscon)\n");
156 return PTR_ERR(drv
->reg_pmu
);
159 if (drv
->cfg
->has_mode_switch
) {
160 drv
->reg_sys
= syscon_regmap_lookup_by_phandle(
161 pdev
->dev
.of_node
, "samsung,sysreg-phandle");
162 if (IS_ERR(drv
->reg_sys
)) {
163 dev_err(dev
, "Failed to map system registers (via syscon)\n");
164 return PTR_ERR(drv
->reg_sys
);
168 drv
->clk
= devm_clk_get(dev
, "phy");
169 if (IS_ERR(drv
->clk
)) {
170 dev_err(dev
, "Failed to get clock of phy controller\n");
171 return PTR_ERR(drv
->clk
);
174 drv
->ref_clk
= devm_clk_get(dev
, "ref");
175 if (IS_ERR(drv
->ref_clk
)) {
176 dev_err(dev
, "Failed to get reference clock for the phy controller\n");
177 return PTR_ERR(drv
->ref_clk
);
180 drv
->ref_rate
= clk_get_rate(drv
->ref_clk
);
181 if (drv
->cfg
->rate_to_clk
) {
182 ret
= drv
->cfg
->rate_to_clk(drv
->ref_rate
, &drv
->ref_reg_val
);
187 for (i
= 0; i
< drv
->cfg
->num_phys
; i
++) {
188 char *label
= drv
->cfg
->phys
[i
].label
;
189 struct samsung_usb2_phy_instance
*p
= &drv
->instances
[i
];
191 dev_dbg(dev
, "Creating phy \"%s\"\n", label
);
192 p
->phy
= devm_phy_create(dev
, &samsung_usb2_phy_ops
, NULL
);
193 if (IS_ERR(p
->phy
)) {
194 dev_err(drv
->dev
, "Failed to create usb2_phy \"%s\"\n",
196 return PTR_ERR(p
->phy
);
199 p
->cfg
= &drv
->cfg
->phys
[i
];
201 phy_set_bus_width(p
->phy
, 8);
202 phy_set_drvdata(p
->phy
, p
);
205 phy_provider
= devm_of_phy_provider_register(dev
,
206 samsung_usb2_phy_xlate
);
207 if (IS_ERR(phy_provider
)) {
208 dev_err(drv
->dev
, "Failed to register phy provider\n");
209 return PTR_ERR(phy_provider
);
215 static struct platform_driver samsung_usb2_phy_driver
= {
216 .probe
= samsung_usb2_phy_probe
,
218 .of_match_table
= samsung_usb2_phy_of_match
,
219 .name
= "samsung-usb2-phy",
220 .owner
= THIS_MODULE
,
224 module_platform_driver(samsung_usb2_phy_driver
);
225 MODULE_DESCRIPTION("Samsung S5P/EXYNOS SoC USB PHY driver");
226 MODULE_AUTHOR("Kamil Debski <k.debski@samsung.com>");
227 MODULE_LICENSE("GPL v2");
228 MODULE_ALIAS("platform:samsung-usb2-phy");