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d1158372 PG |
1 | /* |
2 | * ST OHCI driver | |
3 | * | |
4 | * Copyright (C) 2014 STMicroelectronics – All Rights Reserved | |
5 | * | |
6 | * Author: Peter Griffin <peter.griffin@linaro.org> | |
7 | * | |
8 | * Derived from ohci-platform.c | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 as | |
12 | * published by the Free Software Foundation. | |
13 | */ | |
14 | ||
15 | #include <linux/clk.h> | |
16 | #include <linux/dma-mapping.h> | |
17 | #include <linux/hrtimer.h> | |
18 | #include <linux/io.h> | |
19 | #include <linux/kernel.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/err.h> | |
22 | #include <linux/phy/phy.h> | |
23 | #include <linux/platform_device.h> | |
24 | #include <linux/reset.h> | |
25 | #include <linux/usb/ohci_pdriver.h> | |
26 | #include <linux/usb.h> | |
27 | #include <linux/usb/hcd.h> | |
28 | ||
29 | #include "ohci.h" | |
30 | ||
31 | #define USB_MAX_CLKS 3 | |
32 | ||
33 | struct st_ohci_platform_priv { | |
34 | struct clk *clks[USB_MAX_CLKS]; | |
35 | struct clk *clk48; | |
36 | struct reset_control *rst; | |
37 | struct reset_control *pwr; | |
38 | struct phy *phy; | |
39 | }; | |
40 | ||
41 | #define DRIVER_DESC "OHCI STMicroelectronics driver" | |
42 | ||
43 | #define hcd_to_ohci_priv(h) \ | |
44 | ((struct st_ohci_platform_priv *)hcd_to_ohci(h)->priv) | |
45 | ||
46 | static const char hcd_name[] = "ohci-st"; | |
47 | ||
48 | static int st_ohci_platform_power_on(struct platform_device *dev) | |
49 | { | |
50 | struct usb_hcd *hcd = platform_get_drvdata(dev); | |
51 | struct st_ohci_platform_priv *priv = hcd_to_ohci_priv(hcd); | |
52 | int clk, ret; | |
53 | ||
54 | ret = reset_control_deassert(priv->pwr); | |
55 | if (ret) | |
56 | return ret; | |
57 | ||
58 | ret = reset_control_deassert(priv->rst); | |
59 | if (ret) | |
60 | goto err_assert_power; | |
61 | ||
62 | /* some SoCs don't have a dedicated 48Mhz clock, but those that do | |
63 | need the rate to be explicitly set */ | |
64 | if (priv->clk48) { | |
65 | ret = clk_set_rate(priv->clk48, 48000000); | |
66 | if (ret) | |
67 | goto err_assert_reset; | |
68 | } | |
69 | ||
70 | for (clk = 0; clk < USB_MAX_CLKS && priv->clks[clk]; clk++) { | |
71 | ret = clk_prepare_enable(priv->clks[clk]); | |
72 | if (ret) | |
73 | goto err_disable_clks; | |
74 | } | |
75 | ||
76 | ret = phy_init(priv->phy); | |
77 | if (ret) | |
78 | goto err_disable_clks; | |
79 | ||
80 | ret = phy_power_on(priv->phy); | |
81 | if (ret) | |
82 | goto err_exit_phy; | |
83 | ||
84 | return 0; | |
85 | ||
86 | err_exit_phy: | |
87 | phy_exit(priv->phy); | |
88 | err_disable_clks: | |
89 | while (--clk >= 0) | |
90 | clk_disable_unprepare(priv->clks[clk]); | |
91 | err_assert_reset: | |
92 | reset_control_assert(priv->rst); | |
93 | err_assert_power: | |
94 | reset_control_assert(priv->pwr); | |
95 | ||
96 | return ret; | |
97 | } | |
98 | ||
99 | static void st_ohci_platform_power_off(struct platform_device *dev) | |
100 | { | |
101 | struct usb_hcd *hcd = platform_get_drvdata(dev); | |
102 | struct st_ohci_platform_priv *priv = hcd_to_ohci_priv(hcd); | |
103 | ||
104 | int clk; | |
105 | ||
106 | reset_control_assert(priv->pwr); | |
107 | ||
108 | reset_control_assert(priv->rst); | |
109 | ||
110 | phy_power_off(priv->phy); | |
111 | ||
112 | phy_exit(priv->phy); | |
113 | ||
114 | for (clk = USB_MAX_CLKS - 1; clk >= 0; clk--) | |
115 | if (priv->clks[clk]) | |
116 | clk_disable_unprepare(priv->clks[clk]); | |
117 | } | |
118 | ||
119 | static struct hc_driver __read_mostly ohci_platform_hc_driver; | |
120 | ||
121 | static const struct ohci_driver_overrides platform_overrides __initconst = { | |
122 | .product_desc = "ST OHCI controller", | |
123 | .extra_priv_size = sizeof(struct st_ohci_platform_priv), | |
124 | }; | |
125 | ||
126 | static struct usb_ohci_pdata ohci_platform_defaults = { | |
127 | .power_on = st_ohci_platform_power_on, | |
128 | .power_suspend = st_ohci_platform_power_off, | |
129 | .power_off = st_ohci_platform_power_off, | |
130 | }; | |
131 | ||
132 | static int st_ohci_platform_probe(struct platform_device *dev) | |
133 | { | |
134 | struct usb_hcd *hcd; | |
135 | struct resource *res_mem; | |
136 | struct usb_ohci_pdata *pdata = &ohci_platform_defaults; | |
137 | struct st_ohci_platform_priv *priv; | |
138 | struct ohci_hcd *ohci; | |
139 | int err, irq, clk = 0; | |
140 | ||
141 | if (usb_disabled()) | |
142 | return -ENODEV; | |
143 | ||
144 | irq = platform_get_irq(dev, 0); | |
145 | if (irq < 0) { | |
146 | dev_err(&dev->dev, "no irq provided"); | |
147 | return irq; | |
148 | } | |
149 | ||
150 | res_mem = platform_get_resource(dev, IORESOURCE_MEM, 0); | |
151 | if (!res_mem) { | |
152 | dev_err(&dev->dev, "no memory resource provided"); | |
153 | return -ENXIO; | |
154 | } | |
155 | ||
156 | hcd = usb_create_hcd(&ohci_platform_hc_driver, &dev->dev, | |
157 | dev_name(&dev->dev)); | |
158 | if (!hcd) | |
159 | return -ENOMEM; | |
160 | ||
161 | platform_set_drvdata(dev, hcd); | |
162 | dev->dev.platform_data = pdata; | |
163 | priv = hcd_to_ohci_priv(hcd); | |
164 | ohci = hcd_to_ohci(hcd); | |
165 | ||
166 | priv->phy = devm_phy_get(&dev->dev, "usb"); | |
167 | if (IS_ERR(priv->phy)) { | |
168 | err = PTR_ERR(priv->phy); | |
169 | goto err_put_hcd; | |
170 | } | |
171 | ||
172 | for (clk = 0; clk < USB_MAX_CLKS; clk++) { | |
173 | priv->clks[clk] = of_clk_get(dev->dev.of_node, clk); | |
174 | if (IS_ERR(priv->clks[clk])) { | |
175 | err = PTR_ERR(priv->clks[clk]); | |
176 | if (err == -EPROBE_DEFER) | |
177 | goto err_put_clks; | |
178 | priv->clks[clk] = NULL; | |
179 | break; | |
180 | } | |
181 | } | |
182 | ||
183 | /* some SoCs don't have a dedicated 48Mhz clock, but those that | |
184 | do need the rate to be explicitly set */ | |
185 | priv->clk48 = devm_clk_get(&dev->dev, "clk48"); | |
186 | if (IS_ERR(priv->clk48)) { | |
187 | dev_info(&dev->dev, "48MHz clk not found\n"); | |
188 | priv->clk48 = NULL; | |
189 | } | |
190 | ||
f5ee3f2b LJ |
191 | priv->pwr = |
192 | devm_reset_control_get_optional_shared(&dev->dev, "power"); | |
d1158372 PG |
193 | if (IS_ERR(priv->pwr)) { |
194 | err = PTR_ERR(priv->pwr); | |
195 | goto err_put_clks; | |
196 | } | |
197 | ||
f5ee3f2b LJ |
198 | priv->rst = |
199 | devm_reset_control_get_optional_shared(&dev->dev, "softreset"); | |
d1158372 PG |
200 | if (IS_ERR(priv->rst)) { |
201 | err = PTR_ERR(priv->rst); | |
202 | goto err_put_clks; | |
203 | } | |
204 | ||
205 | if (pdata->power_on) { | |
206 | err = pdata->power_on(dev); | |
207 | if (err < 0) | |
208 | goto err_power; | |
209 | } | |
210 | ||
211 | hcd->rsrc_start = res_mem->start; | |
212 | hcd->rsrc_len = resource_size(res_mem); | |
213 | ||
214 | hcd->regs = devm_ioremap_resource(&dev->dev, res_mem); | |
215 | if (IS_ERR(hcd->regs)) { | |
216 | err = PTR_ERR(hcd->regs); | |
217 | goto err_power; | |
218 | } | |
219 | err = usb_add_hcd(hcd, irq, IRQF_SHARED); | |
220 | if (err) | |
221 | goto err_power; | |
222 | ||
223 | device_wakeup_enable(hcd->self.controller); | |
224 | ||
225 | platform_set_drvdata(dev, hcd); | |
226 | ||
227 | return err; | |
228 | ||
229 | err_power: | |
230 | if (pdata->power_off) | |
231 | pdata->power_off(dev); | |
232 | ||
233 | err_put_clks: | |
234 | while (--clk >= 0) | |
235 | clk_put(priv->clks[clk]); | |
236 | err_put_hcd: | |
237 | if (pdata == &ohci_platform_defaults) | |
238 | dev->dev.platform_data = NULL; | |
239 | ||
240 | usb_put_hcd(hcd); | |
241 | ||
242 | return err; | |
243 | } | |
244 | ||
245 | static int st_ohci_platform_remove(struct platform_device *dev) | |
246 | { | |
247 | struct usb_hcd *hcd = platform_get_drvdata(dev); | |
248 | struct usb_ohci_pdata *pdata = dev_get_platdata(&dev->dev); | |
249 | struct st_ohci_platform_priv *priv = hcd_to_ohci_priv(hcd); | |
250 | int clk; | |
251 | ||
252 | usb_remove_hcd(hcd); | |
253 | ||
254 | if (pdata->power_off) | |
255 | pdata->power_off(dev); | |
256 | ||
257 | ||
258 | for (clk = 0; clk < USB_MAX_CLKS && priv->clks[clk]; clk++) | |
259 | clk_put(priv->clks[clk]); | |
260 | ||
261 | usb_put_hcd(hcd); | |
262 | ||
263 | if (pdata == &ohci_platform_defaults) | |
264 | dev->dev.platform_data = NULL; | |
265 | ||
266 | return 0; | |
267 | } | |
268 | ||
269 | #ifdef CONFIG_PM_SLEEP | |
270 | ||
271 | static int st_ohci_suspend(struct device *dev) | |
272 | { | |
273 | struct usb_hcd *hcd = dev_get_drvdata(dev); | |
274 | struct usb_ohci_pdata *pdata = dev->platform_data; | |
20db5513 | 275 | struct platform_device *pdev = to_platform_device(dev); |
d1158372 PG |
276 | bool do_wakeup = device_may_wakeup(dev); |
277 | int ret; | |
278 | ||
279 | ret = ohci_suspend(hcd, do_wakeup); | |
280 | if (ret) | |
281 | return ret; | |
282 | ||
283 | if (pdata->power_suspend) | |
284 | pdata->power_suspend(pdev); | |
285 | ||
286 | return ret; | |
287 | } | |
288 | ||
289 | static int st_ohci_resume(struct device *dev) | |
290 | { | |
291 | struct usb_hcd *hcd = dev_get_drvdata(dev); | |
292 | struct usb_ohci_pdata *pdata = dev_get_platdata(dev); | |
20db5513 | 293 | struct platform_device *pdev = to_platform_device(dev); |
d1158372 PG |
294 | int err; |
295 | ||
296 | if (pdata->power_on) { | |
297 | err = pdata->power_on(pdev); | |
298 | if (err < 0) | |
299 | return err; | |
300 | } | |
301 | ||
302 | ohci_resume(hcd, false); | |
303 | return 0; | |
304 | } | |
305 | ||
306 | static SIMPLE_DEV_PM_OPS(st_ohci_pm_ops, st_ohci_suspend, st_ohci_resume); | |
307 | ||
308 | #endif /* CONFIG_PM_SLEEP */ | |
309 | ||
310 | static const struct of_device_id st_ohci_platform_ids[] = { | |
311 | { .compatible = "st,st-ohci-300x", }, | |
312 | { /* sentinel */ } | |
313 | }; | |
314 | MODULE_DEVICE_TABLE(of, st_ohci_platform_ids); | |
315 | ||
316 | static struct platform_driver ohci_platform_driver = { | |
317 | .probe = st_ohci_platform_probe, | |
318 | .remove = st_ohci_platform_remove, | |
319 | .shutdown = usb_hcd_platform_shutdown, | |
320 | .driver = { | |
321 | .name = "st-ohci", | |
322 | #ifdef CONFIG_PM_SLEEP | |
323 | .pm = &st_ohci_pm_ops, | |
324 | #endif | |
325 | .of_match_table = st_ohci_platform_ids, | |
326 | } | |
327 | }; | |
328 | ||
329 | static int __init ohci_platform_init(void) | |
330 | { | |
331 | if (usb_disabled()) | |
332 | return -ENODEV; | |
333 | ||
334 | pr_info("%s: " DRIVER_DESC "\n", hcd_name); | |
335 | ||
336 | ohci_init_driver(&ohci_platform_hc_driver, &platform_overrides); | |
337 | return platform_driver_register(&ohci_platform_driver); | |
338 | } | |
339 | module_init(ohci_platform_init); | |
340 | ||
341 | static void __exit ohci_platform_cleanup(void) | |
342 | { | |
343 | platform_driver_unregister(&ohci_platform_driver); | |
344 | } | |
345 | module_exit(ohci_platform_cleanup); | |
346 | ||
347 | MODULE_DESCRIPTION(DRIVER_DESC); | |
348 | MODULE_AUTHOR("Peter Griffin <peter.griffin@linaro.org>"); | |
349 | MODULE_LICENSE("GPL"); |