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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
32#include "ohci.h"
33
34#define DRIVER_DESC "OHCI generic platform driver"
35#define OHCI_MAX_CLKS 3
36#define hcd_to_ohci_priv(h) ((struct ohci_platform_priv *)hcd_to_ohci(h)->priv)
37
38struct ohci_platform_priv {
39 struct clk *clks[OHCI_MAX_CLKS];
40 struct reset_control *resets;
41};
42
43static const char hcd_name[] = "ohci-platform";
44
45static int ohci_platform_power_on(struct platform_device *dev)
46{
47 struct usb_hcd *hcd = platform_get_drvdata(dev);
48 struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
49 int clk, ret;
50
51 for (clk = 0; clk < OHCI_MAX_CLKS && priv->clks[clk]; clk++) {
52 ret = clk_prepare_enable(priv->clks[clk]);
53 if (ret)
54 goto err_disable_clks;
55 }
56
57 return 0;
58
59err_disable_clks:
60 while (--clk >= 0)
61 clk_disable_unprepare(priv->clks[clk]);
62
63 return ret;
64}
65
66static void ohci_platform_power_off(struct platform_device *dev)
67{
68 struct usb_hcd *hcd = platform_get_drvdata(dev);
69 struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
70 int clk;
71
72 for (clk = OHCI_MAX_CLKS - 1; clk >= 0; clk--)
73 if (priv->clks[clk])
74 clk_disable_unprepare(priv->clks[clk]);
75}
76
77static struct hc_driver __read_mostly ohci_platform_hc_driver;
78
79static const struct ohci_driver_overrides platform_overrides __initconst = {
80 .product_desc = "Generic Platform OHCI controller",
81 .extra_priv_size = sizeof(struct ohci_platform_priv),
82};
83
84static struct usb_ohci_pdata ohci_platform_defaults = {
85 .power_on = ohci_platform_power_on,
86 .power_suspend = ohci_platform_power_off,
87 .power_off = ohci_platform_power_off,
88};
89
90static int ohci_platform_probe(struct platform_device *dev)
91{
92 struct usb_hcd *hcd;
93 struct resource *res_mem;
94 struct usb_ohci_pdata *pdata = dev_get_platdata(&dev->dev);
95 struct ohci_platform_priv *priv;
96 struct ohci_hcd *ohci;
97 int err, irq, clk = 0;
98
99 if (usb_disabled())
100 return -ENODEV;
101
102
103
104
105
106 if (!pdata)
107 pdata = &ohci_platform_defaults;
108
109 err = dma_coerce_mask_and_coherent(&dev->dev, DMA_BIT_MASK(32));
110 if (err)
111 return err;
112
113 irq = platform_get_irq(dev, 0);
114 if (irq < 0)
115 return irq;
116
117 hcd = usb_create_hcd(&ohci_platform_hc_driver, &dev->dev,
118 dev_name(&dev->dev));
119 if (!hcd)
120 return -ENOMEM;
121
122 platform_set_drvdata(dev, hcd);
123 dev->dev.platform_data = pdata;
124 priv = hcd_to_ohci_priv(hcd);
125 ohci = hcd_to_ohci(hcd);
126
127 if (pdata == &ohci_platform_defaults && dev->dev.of_node) {
128 if (of_property_read_bool(dev->dev.of_node, "big-endian-regs"))
129 ohci->flags |= OHCI_QUIRK_BE_MMIO;
130
131 if (of_property_read_bool(dev->dev.of_node, "big-endian-desc"))
132 ohci->flags |= OHCI_QUIRK_BE_DESC;
133
134 if (of_property_read_bool(dev->dev.of_node, "big-endian"))
135 ohci->flags |= OHCI_QUIRK_BE_MMIO | OHCI_QUIRK_BE_DESC;
136
137 if (of_property_read_bool(dev->dev.of_node, "no-big-frame-no"))
138 ohci->flags |= OHCI_QUIRK_FRAME_NO;
139
140 if (of_property_read_bool(dev->dev.of_node,
141 "remote-wakeup-connected"))
142 ohci->hc_control = OHCI_CTRL_RWC;
143
144 of_property_read_u32(dev->dev.of_node, "num-ports",
145 &ohci->num_ports);
146
147 for (clk = 0; clk < OHCI_MAX_CLKS; clk++) {
148 priv->clks[clk] = of_clk_get(dev->dev.of_node, clk);
149 if (IS_ERR(priv->clks[clk])) {
150 err = PTR_ERR(priv->clks[clk]);
151 if (err == -EPROBE_DEFER)
152 goto err_put_clks;
153 priv->clks[clk] = NULL;
154 break;
155 }
156 }
157
158 priv->resets = devm_reset_control_array_get_optional_shared(
159 &dev->dev);
160 if (IS_ERR(priv->resets)) {
161 err = PTR_ERR(priv->resets);
162 goto err_put_clks;
163 }
164
165 err = reset_control_deassert(priv->resets);
166 if (err)
167 goto err_put_clks;
168 }
169
170 if (pdata->big_endian_desc)
171 ohci->flags |= OHCI_QUIRK_BE_DESC;
172 if (pdata->big_endian_mmio)
173 ohci->flags |= OHCI_QUIRK_BE_MMIO;
174 if (pdata->no_big_frame_no)
175 ohci->flags |= OHCI_QUIRK_FRAME_NO;
176 if (pdata->num_ports)
177 ohci->num_ports = pdata->num_ports;
178
179#ifndef CONFIG_USB_OHCI_BIG_ENDIAN_MMIO
180 if (ohci->flags & OHCI_QUIRK_BE_MMIO) {
181 dev_err(&dev->dev,
182 "Error: CONFIG_USB_OHCI_BIG_ENDIAN_MMIO not set\n");
183 err = -EINVAL;
184 goto err_reset;
185 }
186#endif
187#ifndef CONFIG_USB_OHCI_BIG_ENDIAN_DESC
188 if (ohci->flags & OHCI_QUIRK_BE_DESC) {
189 dev_err(&dev->dev,
190 "Error: CONFIG_USB_OHCI_BIG_ENDIAN_DESC not set\n");
191 err = -EINVAL;
192 goto err_reset;
193 }
194#endif
195
196 pm_runtime_set_active(&dev->dev);
197 pm_runtime_enable(&dev->dev);
198 if (pdata->power_on) {
199 err = pdata->power_on(dev);
200 if (err < 0)
201 goto err_reset;
202 }
203
204 res_mem = platform_get_resource(dev, IORESOURCE_MEM, 0);
205 hcd->regs = devm_ioremap_resource(&dev->dev, res_mem);
206 if (IS_ERR(hcd->regs)) {
207 err = PTR_ERR(hcd->regs);
208 goto err_power;
209 }
210 hcd->rsrc_start = res_mem->start;
211 hcd->rsrc_len = resource_size(res_mem);
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
223err_power:
224 if (pdata->power_off)
225 pdata->power_off(dev);
226err_reset:
227 pm_runtime_disable(&dev->dev);
228 reset_control_assert(priv->resets);
229err_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
241static int 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 return 0;
268}
269
270#ifdef CONFIG_PM_SLEEP
271static int ohci_platform_suspend(struct device *dev)
272{
273 struct usb_hcd *hcd = dev_get_drvdata(dev);
274 struct usb_ohci_pdata *pdata = dev->platform_data;
275 struct platform_device *pdev = to_platform_device(dev);
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
289static int ohci_platform_resume(struct device *dev)
290{
291 struct usb_hcd *hcd = dev_get_drvdata(dev);
292 struct usb_ohci_pdata *pdata = dev_get_platdata(dev);
293 struct platform_device *pdev = to_platform_device(dev);
294
295 if (pdata->power_on) {
296 int err = pdata->power_on(pdev);
297 if (err < 0)
298 return err;
299 }
300
301 ohci_resume(hcd, false);
302 return 0;
303}
304#endif
305
306static const struct of_device_id ohci_platform_ids[] = {
307 { .compatible = "generic-ohci", },
308 { .compatible = "cavium,octeon-6335-ohci", },
309 { .compatible = "ti,ohci-omap3", },
310 { }
311};
312MODULE_DEVICE_TABLE(of, ohci_platform_ids);
313
314static const struct platform_device_id ohci_platform_table[] = {
315 { "ohci-platform", 0 },
316 { }
317};
318MODULE_DEVICE_TABLE(platform, ohci_platform_table);
319
320static SIMPLE_DEV_PM_OPS(ohci_platform_pm_ops, ohci_platform_suspend,
321 ohci_platform_resume);
322
323static struct platform_driver ohci_platform_driver = {
324 .id_table = ohci_platform_table,
325 .probe = ohci_platform_probe,
326 .remove = ohci_platform_remove,
327 .shutdown = usb_hcd_platform_shutdown,
328 .driver = {
329 .name = "ohci-platform",
330 .pm = &ohci_platform_pm_ops,
331 .of_match_table = ohci_platform_ids,
332 }
333};
334
335static int __init ohci_platform_init(void)
336{
337 if (usb_disabled())
338 return -ENODEV;
339
340 pr_info("%s: " DRIVER_DESC "\n", hcd_name);
341
342 ohci_init_driver(&ohci_platform_hc_driver, &platform_overrides);
343 return platform_driver_register(&ohci_platform_driver);
344}
345module_init(ohci_platform_init);
346
347static void __exit ohci_platform_cleanup(void)
348{
349 platform_driver_unregister(&ohci_platform_driver);
350}
351module_exit(ohci_platform_cleanup);
352
353MODULE_DESCRIPTION(DRIVER_DESC);
354MODULE_AUTHOR("Hauke Mehrtens");
355MODULE_AUTHOR("Alan Stern");
356MODULE_LICENSE("GPL");
357
