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11#include <linux/clk.h>
12#include <linux/delay.h>
13#include <linux/io.h>
14#include <linux/module.h>
15#include <linux/of.h>
16#include <linux/phy/phy.h>
17#include <linux/platform_device.h>
18#include <linux/pm_runtime.h>
19
20#define USB30_CLKSET0 0x034
21#define USB30_CLKSET1 0x036
22#define USB30_SSC_SET 0x038
23#define USB30_PHY_ENABLE 0x060
24#define USB30_VBUS_EN 0x064
25
26
27#define CLKSET0_PRIVATE 0x05c0
28#define CLKSET0_USB30_FSEL_USB_EXTAL 0x0002
29
30
31#define CLKSET1_USB30_PLL_MULTI_SHIFT 6
32#define CLKSET1_USB30_PLL_MULTI_USB_EXTAL (0x64 << \
33 CLKSET1_USB30_PLL_MULTI_SHIFT)
34#define CLKSET1_PHYRESET BIT(4)
35#define CLKSET1_REF_CLKDIV BIT(3)
36#define CLKSET1_PRIVATE_2_1 BIT(1)
37#define CLKSET1_REF_CLK_SEL BIT(0)
38
39
40#define SSC_SET_SSC_EN BIT(12)
41#define SSC_SET_RANGE_SHIFT 9
42#define SSC_SET_RANGE_4980 (0x0 << SSC_SET_RANGE_SHIFT)
43#define SSC_SET_RANGE_4492 (0x1 << SSC_SET_RANGE_SHIFT)
44#define SSC_SET_RANGE_4003 (0x2 << SSC_SET_RANGE_SHIFT)
45
46
47#define PHY_ENABLE_RESET_EN BIT(4)
48
49
50#define VBUS_EN_VBUS_EN BIT(1)
51
52struct rcar_gen3_usb3 {
53 void __iomem *base;
54 struct phy *phy;
55 u32 ssc_range;
56 bool usb3s_clk;
57 bool usb_extal;
58};
59
60static void write_clkset1_for_usb_extal(struct rcar_gen3_usb3 *r, bool reset)
61{
62 u16 val = CLKSET1_USB30_PLL_MULTI_USB_EXTAL |
63 CLKSET1_REF_CLKDIV | CLKSET1_PRIVATE_2_1;
64
65 if (reset)
66 val |= CLKSET1_PHYRESET;
67
68 writew(val, r->base + USB30_CLKSET1);
69}
70
71static void rcar_gen3_phy_usb3_enable_ssc(struct rcar_gen3_usb3 *r)
72{
73 u16 val = SSC_SET_SSC_EN;
74
75 switch (r->ssc_range) {
76 case 4980:
77 val |= SSC_SET_RANGE_4980;
78 break;
79 case 4492:
80 val |= SSC_SET_RANGE_4492;
81 break;
82 case 4003:
83 val |= SSC_SET_RANGE_4003;
84 break;
85 default:
86 dev_err(&r->phy->dev, "%s: unsupported range (%x)\n", __func__,
87 r->ssc_range);
88 return;
89 }
90
91 writew(val, r->base + USB30_SSC_SET);
92}
93
94static void rcar_gen3_phy_usb3_select_usb_extal(struct rcar_gen3_usb3 *r)
95{
96 write_clkset1_for_usb_extal(r, false);
97 if (r->ssc_range)
98 rcar_gen3_phy_usb3_enable_ssc(r);
99 writew(CLKSET0_PRIVATE | CLKSET0_USB30_FSEL_USB_EXTAL,
100 r->base + USB30_CLKSET0);
101 writew(PHY_ENABLE_RESET_EN, r->base + USB30_PHY_ENABLE);
102 write_clkset1_for_usb_extal(r, true);
103 usleep_range(10, 20);
104 write_clkset1_for_usb_extal(r, false);
105}
106
107static int rcar_gen3_phy_usb3_init(struct phy *p)
108{
109 struct rcar_gen3_usb3 *r = phy_get_drvdata(p);
110
111 dev_vdbg(&r->phy->dev, "%s: enter (%d, %d, %d)\n", __func__,
112 r->usb3s_clk, r->usb_extal, r->ssc_range);
113
114 if (!r->usb3s_clk && r->usb_extal)
115 rcar_gen3_phy_usb3_select_usb_extal(r);
116
117
118 writew(VBUS_EN_VBUS_EN, r->base + USB30_VBUS_EN);
119
120 return 0;
121}
122
123static const struct phy_ops rcar_gen3_phy_usb3_ops = {
124 .init = rcar_gen3_phy_usb3_init,
125 .owner = THIS_MODULE,
126};
127
128static const struct of_device_id rcar_gen3_phy_usb3_match_table[] = {
129 { .compatible = "renesas,rcar-gen3-usb3-phy" },
130 { }
131};
132MODULE_DEVICE_TABLE(of, rcar_gen3_phy_usb3_match_table);
133
134static int rcar_gen3_phy_usb3_probe(struct platform_device *pdev)
135{
136 struct device *dev = &pdev->dev;
137 struct rcar_gen3_usb3 *r;
138 struct phy_provider *provider;
139 struct resource *res;
140 int ret = 0;
141 struct clk *clk;
142
143 if (!dev->of_node) {
144 dev_err(dev, "This driver needs device tree\n");
145 return -EINVAL;
146 }
147
148 r = devm_kzalloc(dev, sizeof(*r), GFP_KERNEL);
149 if (!r)
150 return -ENOMEM;
151
152 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
153 r->base = devm_ioremap_resource(dev, res);
154 if (IS_ERR(r->base))
155 return PTR_ERR(r->base);
156
157 clk = devm_clk_get(dev, "usb3s_clk");
158 if (!IS_ERR(clk) && !clk_prepare_enable(clk)) {
159 r->usb3s_clk = !!clk_get_rate(clk);
160 clk_disable_unprepare(clk);
161 }
162 clk = devm_clk_get(dev, "usb_extal");
163 if (!IS_ERR(clk) && !clk_prepare_enable(clk)) {
164 r->usb_extal = !!clk_get_rate(clk);
165 clk_disable_unprepare(clk);
166 }
167
168 if (!r->usb3s_clk && !r->usb_extal) {
169 dev_err(dev, "This driver needs usb3s_clk and/or usb_extal\n");
170 ret = -EINVAL;
171 goto error;
172 }
173
174
175
176
177
178 pm_runtime_enable(dev);
179
180 r->phy = devm_phy_create(dev, NULL, &rcar_gen3_phy_usb3_ops);
181 if (IS_ERR(r->phy)) {
182 dev_err(dev, "Failed to create USB3 PHY\n");
183 ret = PTR_ERR(r->phy);
184 goto error;
185 }
186
187 of_property_read_u32(dev->of_node, "renesas,ssc-range", &r->ssc_range);
188
189 platform_set_drvdata(pdev, r);
190 phy_set_drvdata(r->phy, r);
191
192 provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
193 if (IS_ERR(provider)) {
194 dev_err(dev, "Failed to register PHY provider\n");
195 ret = PTR_ERR(provider);
196 goto error;
197 }
198
199 return 0;
200
201error:
202 pm_runtime_disable(dev);
203
204 return ret;
205}
206
207static int rcar_gen3_phy_usb3_remove(struct platform_device *pdev)
208{
209 pm_runtime_disable(&pdev->dev);
210
211 return 0;
212};
213
214static struct platform_driver rcar_gen3_phy_usb3_driver = {
215 .driver = {
216 .name = "phy_rcar_gen3_usb3",
217 .of_match_table = rcar_gen3_phy_usb3_match_table,
218 },
219 .probe = rcar_gen3_phy_usb3_probe,
220 .remove = rcar_gen3_phy_usb3_remove,
221};
222module_platform_driver(rcar_gen3_phy_usb3_driver);
223
224MODULE_LICENSE("GPL v2");
225MODULE_DESCRIPTION("Renesas R-Car Gen3 USB 3.0 PHY");
226MODULE_AUTHOR("Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>");
227
