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7
8#include <linux/clk.h>
9#include <linux/delay.h>
10#include <linux/io.h>
11#include <linux/module.h>
12#include <linux/of.h>
13#include <linux/phy/phy.h>
14#include <linux/platform_device.h>
15#include <linux/pm_runtime.h>
16
17#define USB30_CLKSET0 0x034
18#define USB30_CLKSET1 0x036
19#define USB30_SSC_SET 0x038
20#define USB30_PHY_ENABLE 0x060
21#define USB30_VBUS_EN 0x064
22
23
24#define CLKSET0_PRIVATE 0x05c0
25#define CLKSET0_USB30_FSEL_USB_EXTAL 0x0002
26
27
28#define CLKSET1_USB30_PLL_MULTI_SHIFT 6
29#define CLKSET1_USB30_PLL_MULTI_USB_EXTAL (0x64 << \
30 CLKSET1_USB30_PLL_MULTI_SHIFT)
31#define CLKSET1_PHYRESET BIT(4)
32#define CLKSET1_REF_CLKDIV BIT(3)
33#define CLKSET1_PRIVATE_2_1 BIT(1)
34#define CLKSET1_REF_CLK_SEL BIT(0)
35
36
37#define SSC_SET_SSC_EN BIT(12)
38#define SSC_SET_RANGE_SHIFT 9
39#define SSC_SET_RANGE_4980 (0x0 << SSC_SET_RANGE_SHIFT)
40#define SSC_SET_RANGE_4492 (0x1 << SSC_SET_RANGE_SHIFT)
41#define SSC_SET_RANGE_4003 (0x2 << SSC_SET_RANGE_SHIFT)
42
43
44#define PHY_ENABLE_RESET_EN BIT(4)
45
46
47#define VBUS_EN_VBUS_EN BIT(1)
48
49struct rcar_gen3_usb3 {
50 void __iomem *base;
51 struct phy *phy;
52 u32 ssc_range;
53 bool usb3s_clk;
54 bool usb_extal;
55};
56
57static void write_clkset1_for_usb_extal(struct rcar_gen3_usb3 *r, bool reset)
58{
59 u16 val = CLKSET1_USB30_PLL_MULTI_USB_EXTAL |
60 CLKSET1_REF_CLKDIV | CLKSET1_PRIVATE_2_1;
61
62 if (reset)
63 val |= CLKSET1_PHYRESET;
64
65 writew(val, r->base + USB30_CLKSET1);
66}
67
68static void rcar_gen3_phy_usb3_enable_ssc(struct rcar_gen3_usb3 *r)
69{
70 u16 val = SSC_SET_SSC_EN;
71
72 switch (r->ssc_range) {
73 case 4980:
74 val |= SSC_SET_RANGE_4980;
75 break;
76 case 4492:
77 val |= SSC_SET_RANGE_4492;
78 break;
79 case 4003:
80 val |= SSC_SET_RANGE_4003;
81 break;
82 default:
83 dev_err(&r->phy->dev, "%s: unsupported range (%x)\n", __func__,
84 r->ssc_range);
85 return;
86 }
87
88 writew(val, r->base + USB30_SSC_SET);
89}
90
91static void rcar_gen3_phy_usb3_select_usb_extal(struct rcar_gen3_usb3 *r)
92{
93 write_clkset1_for_usb_extal(r, false);
94 if (r->ssc_range)
95 rcar_gen3_phy_usb3_enable_ssc(r);
96 writew(CLKSET0_PRIVATE | CLKSET0_USB30_FSEL_USB_EXTAL,
97 r->base + USB30_CLKSET0);
98 writew(PHY_ENABLE_RESET_EN, r->base + USB30_PHY_ENABLE);
99 write_clkset1_for_usb_extal(r, true);
100 usleep_range(10, 20);
101 write_clkset1_for_usb_extal(r, false);
102}
103
104static int rcar_gen3_phy_usb3_init(struct phy *p)
105{
106 struct rcar_gen3_usb3 *r = phy_get_drvdata(p);
107
108 dev_vdbg(&r->phy->dev, "%s: enter (%d, %d, %d)\n", __func__,
109 r->usb3s_clk, r->usb_extal, r->ssc_range);
110
111 if (!r->usb3s_clk && r->usb_extal)
112 rcar_gen3_phy_usb3_select_usb_extal(r);
113
114
115 writew(VBUS_EN_VBUS_EN, r->base + USB30_VBUS_EN);
116
117 return 0;
118}
119
120static const struct phy_ops rcar_gen3_phy_usb3_ops = {
121 .init = rcar_gen3_phy_usb3_init,
122 .owner = THIS_MODULE,
123};
124
125static const struct of_device_id rcar_gen3_phy_usb3_match_table[] = {
126 { .compatible = "renesas,rcar-gen3-usb3-phy" },
127 { }
128};
129MODULE_DEVICE_TABLE(of, rcar_gen3_phy_usb3_match_table);
130
131static int rcar_gen3_phy_usb3_probe(struct platform_device *pdev)
132{
133 struct device *dev = &pdev->dev;
134 struct rcar_gen3_usb3 *r;
135 struct phy_provider *provider;
136 struct resource *res;
137 int ret = 0;
138 struct clk *clk;
139
140 if (!dev->of_node) {
141 dev_err(dev, "This driver needs device tree\n");
142 return -EINVAL;
143 }
144
145 r = devm_kzalloc(dev, sizeof(*r), GFP_KERNEL);
146 if (!r)
147 return -ENOMEM;
148
149 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
150 r->base = devm_ioremap_resource(dev, res);
151 if (IS_ERR(r->base))
152 return PTR_ERR(r->base);
153
154 clk = devm_clk_get(dev, "usb3s_clk");
155 if (!IS_ERR(clk) && !clk_prepare_enable(clk)) {
156 r->usb3s_clk = !!clk_get_rate(clk);
157 clk_disable_unprepare(clk);
158 }
159 clk = devm_clk_get(dev, "usb_extal");
160 if (!IS_ERR(clk) && !clk_prepare_enable(clk)) {
161 r->usb_extal = !!clk_get_rate(clk);
162 clk_disable_unprepare(clk);
163 }
164
165 if (!r->usb3s_clk && !r->usb_extal) {
166 dev_err(dev, "This driver needs usb3s_clk and/or usb_extal\n");
167 ret = -EINVAL;
168 goto error;
169 }
170
171
172
173
174
175 pm_runtime_enable(dev);
176
177 r->phy = devm_phy_create(dev, NULL, &rcar_gen3_phy_usb3_ops);
178 if (IS_ERR(r->phy)) {
179 dev_err(dev, "Failed to create USB3 PHY\n");
180 ret = PTR_ERR(r->phy);
181 goto error;
182 }
183
184 of_property_read_u32(dev->of_node, "renesas,ssc-range", &r->ssc_range);
185
186 platform_set_drvdata(pdev, r);
187 phy_set_drvdata(r->phy, r);
188
189 provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
190 if (IS_ERR(provider)) {
191 dev_err(dev, "Failed to register PHY provider\n");
192 ret = PTR_ERR(provider);
193 goto error;
194 }
195
196 return 0;
197
198error:
199 pm_runtime_disable(dev);
200
201 return ret;
202}
203
204static int rcar_gen3_phy_usb3_remove(struct platform_device *pdev)
205{
206 pm_runtime_disable(&pdev->dev);
207
208 return 0;
209};
210
211static struct platform_driver rcar_gen3_phy_usb3_driver = {
212 .driver = {
213 .name = "phy_rcar_gen3_usb3",
214 .of_match_table = rcar_gen3_phy_usb3_match_table,
215 },
216 .probe = rcar_gen3_phy_usb3_probe,
217 .remove = rcar_gen3_phy_usb3_remove,
218};
219module_platform_driver(rcar_gen3_phy_usb3_driver);
220
221MODULE_LICENSE("GPL v2");
222MODULE_DESCRIPTION("Renesas R-Car Gen3 USB 3.0 PHY");
223MODULE_AUTHOR("Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>");
224
