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1233f59f SS |
1 | /* |
2 | * Renesas R-Car Gen2 PHY driver | |
3 | * | |
4 | * Copyright (C) 2014 Renesas Solutions Corp. | |
5 | * Copyright (C) 2014 Cogent Embedded, Inc. | |
6 | * | |
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. | |
10 | */ | |
11 | ||
12 | #include <linux/clk.h> | |
13 | #include <linux/delay.h> | |
14 | #include <linux/io.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/of.h> | |
17 | #include <linux/phy/phy.h> | |
18 | #include <linux/platform_device.h> | |
19 | #include <linux/spinlock.h> | |
84567995 | 20 | #include <linux/atomic.h> |
1233f59f SS |
21 | |
22 | #define USBHS_LPSTS 0x02 | |
23 | #define USBHS_UGCTRL 0x80 | |
24 | #define USBHS_UGCTRL2 0x84 | |
a3ac3d4a | 25 | #define USBHS_UGSTS 0x88 /* From technical update */ |
1233f59f SS |
26 | |
27 | /* Low Power Status register (LPSTS) */ | |
28 | #define USBHS_LPSTS_SUSPM 0x4000 | |
29 | ||
30 | /* USB General control register (UGCTRL) */ | |
31 | #define USBHS_UGCTRL_CONNECT 0x00000004 | |
32 | #define USBHS_UGCTRL_PLLRESET 0x00000001 | |
33 | ||
34 | /* USB General control register 2 (UGCTRL2) */ | |
35 | #define USBHS_UGCTRL2_USB2SEL 0x80000000 | |
36 | #define USBHS_UGCTRL2_USB2SEL_PCI 0x00000000 | |
37 | #define USBHS_UGCTRL2_USB2SEL_USB30 0x80000000 | |
38 | #define USBHS_UGCTRL2_USB0SEL 0x00000030 | |
39 | #define USBHS_UGCTRL2_USB0SEL_PCI 0x00000010 | |
40 | #define USBHS_UGCTRL2_USB0SEL_HS_USB 0x00000030 | |
41 | ||
42 | /* USB General status register (UGSTS) */ | |
a3ac3d4a | 43 | #define USBHS_UGSTS_LOCK 0x00000100 /* From technical update */ |
1233f59f SS |
44 | |
45 | #define PHYS_PER_CHANNEL 2 | |
46 | ||
47 | struct rcar_gen2_phy { | |
48 | struct phy *phy; | |
49 | struct rcar_gen2_channel *channel; | |
50 | int number; | |
51 | u32 select_value; | |
52 | }; | |
53 | ||
54 | struct rcar_gen2_channel { | |
55 | struct device_node *of_node; | |
56 | struct rcar_gen2_phy_driver *drv; | |
57 | struct rcar_gen2_phy phys[PHYS_PER_CHANNEL]; | |
58 | int selected_phy; | |
59 | u32 select_mask; | |
60 | }; | |
61 | ||
62 | struct rcar_gen2_phy_driver { | |
63 | void __iomem *base; | |
64 | struct clk *clk; | |
65 | spinlock_t lock; | |
66 | int num_channels; | |
67 | struct rcar_gen2_channel *channels; | |
68 | }; | |
69 | ||
70 | static int rcar_gen2_phy_init(struct phy *p) | |
71 | { | |
72 | struct rcar_gen2_phy *phy = phy_get_drvdata(p); | |
73 | struct rcar_gen2_channel *channel = phy->channel; | |
74 | struct rcar_gen2_phy_driver *drv = channel->drv; | |
75 | unsigned long flags; | |
76 | u32 ugctrl2; | |
77 | ||
78 | /* | |
79 | * Try to acquire exclusive access to PHY. The first driver calling | |
80 | * phy_init() on a given channel wins, and all attempts to use another | |
81 | * PHY on this channel will fail until phy_exit() is called by the first | |
82 | * driver. Achieving this with cmpxcgh() should be SMP-safe. | |
83 | */ | |
84 | if (cmpxchg(&channel->selected_phy, -1, phy->number) != -1) | |
85 | return -EBUSY; | |
86 | ||
87 | clk_prepare_enable(drv->clk); | |
88 | ||
89 | spin_lock_irqsave(&drv->lock, flags); | |
90 | ugctrl2 = readl(drv->base + USBHS_UGCTRL2); | |
91 | ugctrl2 &= ~channel->select_mask; | |
92 | ugctrl2 |= phy->select_value; | |
93 | writel(ugctrl2, drv->base + USBHS_UGCTRL2); | |
94 | spin_unlock_irqrestore(&drv->lock, flags); | |
95 | return 0; | |
96 | } | |
97 | ||
98 | static int rcar_gen2_phy_exit(struct phy *p) | |
99 | { | |
100 | struct rcar_gen2_phy *phy = phy_get_drvdata(p); | |
101 | struct rcar_gen2_channel *channel = phy->channel; | |
102 | ||
103 | clk_disable_unprepare(channel->drv->clk); | |
104 | ||
105 | channel->selected_phy = -1; | |
106 | ||
107 | return 0; | |
108 | } | |
109 | ||
110 | static int rcar_gen2_phy_power_on(struct phy *p) | |
111 | { | |
112 | struct rcar_gen2_phy *phy = phy_get_drvdata(p); | |
113 | struct rcar_gen2_phy_driver *drv = phy->channel->drv; | |
114 | void __iomem *base = drv->base; | |
115 | unsigned long flags; | |
116 | u32 value; | |
117 | int err = 0, i; | |
118 | ||
119 | /* Skip if it's not USBHS */ | |
120 | if (phy->select_value != USBHS_UGCTRL2_USB0SEL_HS_USB) | |
121 | return 0; | |
122 | ||
123 | spin_lock_irqsave(&drv->lock, flags); | |
124 | ||
125 | /* Power on USBHS PHY */ | |
126 | value = readl(base + USBHS_UGCTRL); | |
127 | value &= ~USBHS_UGCTRL_PLLRESET; | |
128 | writel(value, base + USBHS_UGCTRL); | |
129 | ||
130 | value = readw(base + USBHS_LPSTS); | |
131 | value |= USBHS_LPSTS_SUSPM; | |
132 | writew(value, base + USBHS_LPSTS); | |
133 | ||
134 | for (i = 0; i < 20; i++) { | |
135 | value = readl(base + USBHS_UGSTS); | |
136 | if ((value & USBHS_UGSTS_LOCK) == USBHS_UGSTS_LOCK) { | |
137 | value = readl(base + USBHS_UGCTRL); | |
138 | value |= USBHS_UGCTRL_CONNECT; | |
139 | writel(value, base + USBHS_UGCTRL); | |
140 | goto out; | |
141 | } | |
142 | udelay(1); | |
143 | } | |
144 | ||
145 | /* Timed out waiting for the PLL lock */ | |
146 | err = -ETIMEDOUT; | |
147 | ||
148 | out: | |
149 | spin_unlock_irqrestore(&drv->lock, flags); | |
150 | ||
151 | return err; | |
152 | } | |
153 | ||
154 | static int rcar_gen2_phy_power_off(struct phy *p) | |
155 | { | |
156 | struct rcar_gen2_phy *phy = phy_get_drvdata(p); | |
157 | struct rcar_gen2_phy_driver *drv = phy->channel->drv; | |
158 | void __iomem *base = drv->base; | |
159 | unsigned long flags; | |
160 | u32 value; | |
161 | ||
162 | /* Skip if it's not USBHS */ | |
163 | if (phy->select_value != USBHS_UGCTRL2_USB0SEL_HS_USB) | |
164 | return 0; | |
165 | ||
166 | spin_lock_irqsave(&drv->lock, flags); | |
167 | ||
168 | /* Power off USBHS PHY */ | |
169 | value = readl(base + USBHS_UGCTRL); | |
170 | value &= ~USBHS_UGCTRL_CONNECT; | |
171 | writel(value, base + USBHS_UGCTRL); | |
172 | ||
173 | value = readw(base + USBHS_LPSTS); | |
174 | value &= ~USBHS_LPSTS_SUSPM; | |
175 | writew(value, base + USBHS_LPSTS); | |
176 | ||
177 | value = readl(base + USBHS_UGCTRL); | |
178 | value |= USBHS_UGCTRL_PLLRESET; | |
179 | writel(value, base + USBHS_UGCTRL); | |
180 | ||
181 | spin_unlock_irqrestore(&drv->lock, flags); | |
182 | ||
183 | return 0; | |
184 | } | |
185 | ||
4a9e5ca1 | 186 | static const struct phy_ops rcar_gen2_phy_ops = { |
1233f59f SS |
187 | .init = rcar_gen2_phy_init, |
188 | .exit = rcar_gen2_phy_exit, | |
189 | .power_on = rcar_gen2_phy_power_on, | |
190 | .power_off = rcar_gen2_phy_power_off, | |
191 | .owner = THIS_MODULE, | |
192 | }; | |
193 | ||
194 | static const struct of_device_id rcar_gen2_phy_match_table[] = { | |
195 | { .compatible = "renesas,usb-phy-r8a7790" }, | |
196 | { .compatible = "renesas,usb-phy-r8a7791" }, | |
9d699bf4 | 197 | { .compatible = "renesas,usb-phy-r8a7794" }, |
1233f59f SS |
198 | { } |
199 | }; | |
200 | MODULE_DEVICE_TABLE(of, rcar_gen2_phy_match_table); | |
201 | ||
202 | static struct phy *rcar_gen2_phy_xlate(struct device *dev, | |
203 | struct of_phandle_args *args) | |
204 | { | |
205 | struct rcar_gen2_phy_driver *drv; | |
206 | struct device_node *np = args->np; | |
207 | int i; | |
208 | ||
1233f59f SS |
209 | drv = dev_get_drvdata(dev); |
210 | if (!drv) | |
211 | return ERR_PTR(-EINVAL); | |
212 | ||
213 | for (i = 0; i < drv->num_channels; i++) { | |
214 | if (np == drv->channels[i].of_node) | |
215 | break; | |
216 | } | |
217 | ||
218 | if (i >= drv->num_channels || args->args[0] >= 2) | |
219 | return ERR_PTR(-ENODEV); | |
220 | ||
221 | return drv->channels[i].phys[args->args[0]].phy; | |
222 | } | |
223 | ||
224 | static const u32 select_mask[] = { | |
225 | [0] = USBHS_UGCTRL2_USB0SEL, | |
226 | [2] = USBHS_UGCTRL2_USB2SEL, | |
227 | }; | |
228 | ||
229 | static const u32 select_value[][PHYS_PER_CHANNEL] = { | |
230 | [0] = { USBHS_UGCTRL2_USB0SEL_PCI, USBHS_UGCTRL2_USB0SEL_HS_USB }, | |
231 | [2] = { USBHS_UGCTRL2_USB2SEL_PCI, USBHS_UGCTRL2_USB2SEL_USB30 }, | |
232 | }; | |
233 | ||
234 | static int rcar_gen2_phy_probe(struct platform_device *pdev) | |
235 | { | |
236 | struct device *dev = &pdev->dev; | |
237 | struct rcar_gen2_phy_driver *drv; | |
238 | struct phy_provider *provider; | |
239 | struct device_node *np; | |
240 | struct resource *res; | |
241 | void __iomem *base; | |
242 | struct clk *clk; | |
243 | int i = 0; | |
244 | ||
245 | if (!dev->of_node) { | |
246 | dev_err(dev, | |
247 | "This driver is required to be instantiated from device tree\n"); | |
248 | return -EINVAL; | |
249 | } | |
250 | ||
251 | clk = devm_clk_get(dev, "usbhs"); | |
252 | if (IS_ERR(clk)) { | |
253 | dev_err(dev, "Can't get USBHS clock\n"); | |
254 | return PTR_ERR(clk); | |
255 | } | |
256 | ||
257 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
258 | base = devm_ioremap_resource(dev, res); | |
259 | if (IS_ERR(base)) | |
260 | return PTR_ERR(base); | |
261 | ||
262 | drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL); | |
263 | if (!drv) | |
264 | return -ENOMEM; | |
265 | ||
266 | spin_lock_init(&drv->lock); | |
267 | ||
268 | drv->clk = clk; | |
269 | drv->base = base; | |
270 | ||
271 | drv->num_channels = of_get_child_count(dev->of_node); | |
272 | drv->channels = devm_kcalloc(dev, drv->num_channels, | |
273 | sizeof(struct rcar_gen2_channel), | |
274 | GFP_KERNEL); | |
275 | if (!drv->channels) | |
276 | return -ENOMEM; | |
277 | ||
278 | for_each_child_of_node(dev->of_node, np) { | |
279 | struct rcar_gen2_channel *channel = drv->channels + i; | |
280 | u32 channel_num; | |
281 | int error, n; | |
282 | ||
283 | channel->of_node = np; | |
284 | channel->drv = drv; | |
285 | channel->selected_phy = -1; | |
286 | ||
287 | error = of_property_read_u32(np, "reg", &channel_num); | |
288 | if (error || channel_num > 2) { | |
289 | dev_err(dev, "Invalid \"reg\" property\n"); | |
290 | return error; | |
291 | } | |
292 | channel->select_mask = select_mask[channel_num]; | |
293 | ||
294 | for (n = 0; n < PHYS_PER_CHANNEL; n++) { | |
295 | struct rcar_gen2_phy *phy = &channel->phys[n]; | |
296 | ||
297 | phy->channel = channel; | |
298 | phy->number = n; | |
299 | phy->select_value = select_value[channel_num][n]; | |
300 | ||
301 | phy->phy = devm_phy_create(dev, NULL, | |
dbc98635 | 302 | &rcar_gen2_phy_ops); |
1233f59f SS |
303 | if (IS_ERR(phy->phy)) { |
304 | dev_err(dev, "Failed to create PHY\n"); | |
305 | return PTR_ERR(phy->phy); | |
306 | } | |
307 | phy_set_drvdata(phy->phy, phy); | |
308 | } | |
309 | ||
310 | i++; | |
311 | } | |
312 | ||
313 | provider = devm_of_phy_provider_register(dev, rcar_gen2_phy_xlate); | |
314 | if (IS_ERR(provider)) { | |
315 | dev_err(dev, "Failed to register PHY provider\n"); | |
316 | return PTR_ERR(provider); | |
317 | } | |
318 | ||
319 | dev_set_drvdata(dev, drv); | |
320 | ||
321 | return 0; | |
322 | } | |
323 | ||
324 | static struct platform_driver rcar_gen2_phy_driver = { | |
325 | .driver = { | |
326 | .name = "phy_rcar_gen2", | |
327 | .of_match_table = rcar_gen2_phy_match_table, | |
328 | }, | |
329 | .probe = rcar_gen2_phy_probe, | |
330 | }; | |
331 | ||
332 | module_platform_driver(rcar_gen2_phy_driver); | |
333 | ||
334 | MODULE_LICENSE("GPL v2"); | |
335 | MODULE_DESCRIPTION("Renesas R-Car Gen2 PHY"); | |
336 | MODULE_AUTHOR("Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>"); |