1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Generic platform ohci driver
4 *
5 * Copyright 2007 Michael Buesch <m@bues.ch>
6 * Copyright 2011-2012 Hauke Mehrtens <hauke@hauke-m.de>
7 * Copyright 2014 Hans de Goede <hdegoede@redhat.com>
8 *
9 * Derived from the OCHI-SSB driver
10 * Derived from the OHCI-PCI driver
11 * Copyright 1999 Roman Weissgaerber
12 * Copyright 2000-2002 David Brownell
13 * Copyright 1999 Linus Torvalds
14 * Copyright 1999 Gregory P. Smith
15 */
16
17 #include <linux/clk.h>
18 #include <linux/dma-mapping.h>
19 #include <linux/hrtimer.h>
20 #include <linux/io.h>
21 #include <linux/kernel.h>
22 #include <linux/module.h>
23 #include <linux/err.h>
24 #include <linux/of.h>
25 #include <linux/platform_device.h>
26 #include <linux/pm_runtime.h>
27 #include <linux/reset.h>
28 #include <linux/usb/ohci_pdriver.h>
29 #include <linux/usb.h>
30 #include <linux/usb/hcd.h>
31 #include <linux/usb/of.h>
32
33 #include "ohci.h"
34
35 #define DRIVER_DESC "OHCI generic platform driver"
36 #define OHCI_MAX_CLKS 4
37 #define hcd_to_ohci_priv(h) ((struct ohci_platform_priv *)hcd_to_ohci(h)->priv)
38
39 struct ohci_platform_priv {
40 struct clk *clks[OHCI_MAX_CLKS];
41 struct reset_control *resets;
42 };
43
ohci_platform_power_on(struct platform_device * dev)44 static int ohci_platform_power_on(struct platform_device *dev)
45 {
46 struct usb_hcd *hcd = platform_get_drvdata(dev);
47 struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
48 int clk, ret;
49
50 for (clk = 0; clk < OHCI_MAX_CLKS && priv->clks[clk]; clk++) {
51 ret = clk_prepare_enable(priv->clks[clk]);
52 if (ret)
53 goto err_disable_clks;
54 }
55
56 return 0;
57
58 err_disable_clks:
59 while (--clk >= 0)
60 clk_disable_unprepare(priv->clks[clk]);
61
62 return ret;
63 }
64
ohci_platform_power_off(struct platform_device * dev)65 static void ohci_platform_power_off(struct platform_device *dev)
66 {
67 struct usb_hcd *hcd = platform_get_drvdata(dev);
68 struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
69 int clk;
70
71 for (clk = OHCI_MAX_CLKS - 1; clk >= 0; clk--)
72 if (priv->clks[clk])
73 clk_disable_unprepare(priv->clks[clk]);
74 }
75
76 static struct hc_driver __read_mostly ohci_platform_hc_driver;
77
78 static const struct ohci_driver_overrides platform_overrides __initconst = {
79 .product_desc = "Generic Platform OHCI controller",
80 .extra_priv_size = sizeof(struct ohci_platform_priv),
81 };
82
83 static struct usb_ohci_pdata ohci_platform_defaults = {
84 .power_on = ohci_platform_power_on,
85 .power_suspend = ohci_platform_power_off,
86 .power_off = ohci_platform_power_off,
87 };
88
ohci_platform_probe(struct platform_device * dev)89 static int ohci_platform_probe(struct platform_device *dev)
90 {
91 struct usb_hcd *hcd;
92 struct resource *res_mem;
93 struct usb_ohci_pdata *pdata = dev_get_platdata(&dev->dev);
94 struct ohci_platform_priv *priv;
95 struct ohci_hcd *ohci;
96 int err, irq, clk = 0;
97
98 if (usb_disabled())
99 return -ENODEV;
100
101 /*
102 * Use reasonable defaults so platforms don't have to provide these
103 * with DT probing on ARM.
104 */
105 if (!pdata)
106 pdata = &ohci_platform_defaults;
107
108 err = dma_coerce_mask_and_coherent(&dev->dev, DMA_BIT_MASK(32));
109 if (err)
110 return err;
111
112 irq = platform_get_irq(dev, 0);
113 if (irq < 0)
114 return irq;
115
116 hcd = usb_create_hcd(&ohci_platform_hc_driver, &dev->dev,
117 dev_name(&dev->dev));
118 if (!hcd)
119 return -ENOMEM;
120
121 platform_set_drvdata(dev, hcd);
122 dev->dev.platform_data = pdata;
123 priv = hcd_to_ohci_priv(hcd);
124 ohci = hcd_to_ohci(hcd);
125
126 if (pdata == &ohci_platform_defaults && dev->dev.of_node) {
127 if (of_property_read_bool(dev->dev.of_node, "big-endian-regs"))
128 ohci->flags |= OHCI_QUIRK_BE_MMIO;
129
130 if (of_property_read_bool(dev->dev.of_node, "big-endian-desc"))
131 ohci->flags |= OHCI_QUIRK_BE_DESC;
132
133 if (of_property_read_bool(dev->dev.of_node, "big-endian"))
134 ohci->flags |= OHCI_QUIRK_BE_MMIO | OHCI_QUIRK_BE_DESC;
135
136 if (of_property_read_bool(dev->dev.of_node, "no-big-frame-no"))
137 ohci->flags |= OHCI_QUIRK_FRAME_NO;
138
139 if (of_property_read_bool(dev->dev.of_node,
140 "remote-wakeup-connected"))
141 ohci->hc_control = OHCI_CTRL_RWC;
142
143 of_property_read_u32(dev->dev.of_node, "num-ports",
144 &ohci->num_ports);
145
146 for (clk = 0; clk < OHCI_MAX_CLKS; clk++) {
147 priv->clks[clk] = of_clk_get(dev->dev.of_node, clk);
148 if (IS_ERR(priv->clks[clk])) {
149 err = PTR_ERR(priv->clks[clk]);
150 if (err == -EPROBE_DEFER)
151 goto err_put_clks;
152 priv->clks[clk] = NULL;
153 break;
154 }
155 }
156
157 priv->resets = devm_reset_control_array_get_optional_shared(
158 &dev->dev);
159 if (IS_ERR(priv->resets)) {
160 err = PTR_ERR(priv->resets);
161 goto err_put_clks;
162 }
163
164 err = reset_control_deassert(priv->resets);
165 if (err)
166 goto err_put_clks;
167 }
168
169 if (pdata->big_endian_desc)
170 ohci->flags |= OHCI_QUIRK_BE_DESC;
171 if (pdata->big_endian_mmio)
172 ohci->flags |= OHCI_QUIRK_BE_MMIO;
173 if (pdata->no_big_frame_no)
174 ohci->flags |= OHCI_QUIRK_FRAME_NO;
175 if (pdata->num_ports)
176 ohci->num_ports = pdata->num_ports;
177
178 #ifndef CONFIG_USB_OHCI_BIG_ENDIAN_MMIO
179 if (ohci->flags & OHCI_QUIRK_BE_MMIO) {
180 dev_err(&dev->dev,
181 "Error: CONFIG_USB_OHCI_BIG_ENDIAN_MMIO not set\n");
182 err = -EINVAL;
183 goto err_reset;
184 }
185 #endif
186 #ifndef CONFIG_USB_OHCI_BIG_ENDIAN_DESC
187 if (ohci->flags & OHCI_QUIRK_BE_DESC) {
188 dev_err(&dev->dev,
189 "Error: CONFIG_USB_OHCI_BIG_ENDIAN_DESC not set\n");
190 err = -EINVAL;
191 goto err_reset;
192 }
193 #endif
194
195 pm_runtime_set_active(&dev->dev);
196 pm_runtime_enable(&dev->dev);
197 if (pdata->power_on) {
198 err = pdata->power_on(dev);
199 if (err < 0)
200 goto err_reset;
201 }
202
203 hcd->regs = devm_platform_get_and_ioremap_resource(dev, 0, &res_mem);
204 if (IS_ERR(hcd->regs)) {
205 err = PTR_ERR(hcd->regs);
206 goto err_power;
207 }
208 hcd->rsrc_start = res_mem->start;
209 hcd->rsrc_len = resource_size(res_mem);
210
211 hcd->tpl_support = of_usb_host_tpl_support(dev->dev.of_node);
212
213 err = usb_add_hcd(hcd, irq, IRQF_SHARED);
214 if (err)
215 goto err_power;
216
217 device_wakeup_enable(hcd->self.controller);
218
219 platform_set_drvdata(dev, hcd);
220
221 return err;
222
223 err_power:
224 if (pdata->power_off)
225 pdata->power_off(dev);
226 err_reset:
227 pm_runtime_disable(&dev->dev);
228 reset_control_assert(priv->resets);
229 err_put_clks:
230 while (--clk >= 0)
231 clk_put(priv->clks[clk]);
232
233 if (pdata == &ohci_platform_defaults)
234 dev->dev.platform_data = NULL;
235
236 usb_put_hcd(hcd);
237
238 return err;
239 }
240
ohci_platform_remove(struct platform_device * dev)241 static void ohci_platform_remove(struct platform_device *dev)
242 {
243 struct usb_hcd *hcd = platform_get_drvdata(dev);
244 struct usb_ohci_pdata *pdata = dev_get_platdata(&dev->dev);
245 struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
246 int clk;
247
248 pm_runtime_get_sync(&dev->dev);
249 usb_remove_hcd(hcd);
250
251 if (pdata->power_off)
252 pdata->power_off(dev);
253
254 reset_control_assert(priv->resets);
255
256 for (clk = 0; clk < OHCI_MAX_CLKS && priv->clks[clk]; clk++)
257 clk_put(priv->clks[clk]);
258
259 usb_put_hcd(hcd);
260
261 pm_runtime_put_sync(&dev->dev);
262 pm_runtime_disable(&dev->dev);
263
264 if (pdata == &ohci_platform_defaults)
265 dev->dev.platform_data = NULL;
266 }
267
268 #ifdef CONFIG_PM_SLEEP
ohci_platform_suspend(struct device * dev)269 static int ohci_platform_suspend(struct device *dev)
270 {
271 struct usb_hcd *hcd = dev_get_drvdata(dev);
272 struct usb_ohci_pdata *pdata = dev->platform_data;
273 struct platform_device *pdev = to_platform_device(dev);
274 bool do_wakeup = device_may_wakeup(dev);
275 int ret;
276
277 ret = ohci_suspend(hcd, do_wakeup);
278 if (ret)
279 return ret;
280
281 if (pdata->power_suspend)
282 pdata->power_suspend(pdev);
283
284 return ret;
285 }
286
ohci_platform_resume_common(struct device * dev,bool hibernated)287 static int ohci_platform_resume_common(struct device *dev, bool hibernated)
288 {
289 struct usb_hcd *hcd = dev_get_drvdata(dev);
290 struct usb_ohci_pdata *pdata = dev_get_platdata(dev);
291 struct platform_device *pdev = to_platform_device(dev);
292
293 if (pdata->power_on) {
294 int err = pdata->power_on(pdev);
295 if (err < 0)
296 return err;
297 }
298
299 ohci_resume(hcd, hibernated);
300
301 pm_runtime_disable(dev);
302 pm_runtime_set_active(dev);
303 pm_runtime_enable(dev);
304
305 return 0;
306 }
307
ohci_platform_resume(struct device * dev)308 static int ohci_platform_resume(struct device *dev)
309 {
310 return ohci_platform_resume_common(dev, false);
311 }
312
ohci_platform_restore(struct device * dev)313 static int ohci_platform_restore(struct device *dev)
314 {
315 return ohci_platform_resume_common(dev, true);
316 }
317 #endif /* CONFIG_PM_SLEEP */
318
319 static const struct of_device_id ohci_platform_ids[] = {
320 { .compatible = "generic-ohci", },
321 { .compatible = "cavium,octeon-6335-ohci", },
322 { .compatible = "ti,ohci-omap3", },
323 { }
324 };
325 MODULE_DEVICE_TABLE(of, ohci_platform_ids);
326
327 static const struct platform_device_id ohci_platform_table[] = {
328 { "ohci-platform", 0 },
329 { }
330 };
331 MODULE_DEVICE_TABLE(platform, ohci_platform_table);
332
333 #ifdef CONFIG_PM_SLEEP
334 static const struct dev_pm_ops ohci_platform_pm_ops = {
335 .suspend = ohci_platform_suspend,
336 .resume = ohci_platform_resume,
337 .freeze = ohci_platform_suspend,
338 .thaw = ohci_platform_resume,
339 .poweroff = ohci_platform_suspend,
340 .restore = ohci_platform_restore,
341 };
342 #endif
343
344 static struct platform_driver ohci_platform_driver = {
345 .id_table = ohci_platform_table,
346 .probe = ohci_platform_probe,
347 .remove_new = ohci_platform_remove,
348 .shutdown = usb_hcd_platform_shutdown,
349 .driver = {
350 .name = "ohci-platform",
351 #ifdef CONFIG_PM_SLEEP
352 .pm = &ohci_platform_pm_ops,
353 #endif
354 .of_match_table = ohci_platform_ids,
355 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
356 }
357 };
358
ohci_platform_init(void)359 static int __init ohci_platform_init(void)
360 {
361 if (usb_disabled())
362 return -ENODEV;
363
364 ohci_init_driver(&ohci_platform_hc_driver, &platform_overrides);
365 return platform_driver_register(&ohci_platform_driver);
366 }
367 module_init(ohci_platform_init);
368
ohci_platform_cleanup(void)369 static void __exit ohci_platform_cleanup(void)
370 {
371 platform_driver_unregister(&ohci_platform_driver);
372 }
373 module_exit(ohci_platform_cleanup);
374
375 MODULE_DESCRIPTION(DRIVER_DESC);
376 MODULE_AUTHOR("Hauke Mehrtens");
377 MODULE_AUTHOR("Alan Stern");
378 MODULE_LICENSE("GPL");
379