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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 dev_err(&dev->dev, "no irq provided");
116 return irq;
117 }
118
119 hcd = usb_create_hcd(&ohci_platform_hc_driver, &dev->dev,
120 dev_name(&dev->dev));
121 if (!hcd)
122 return -ENOMEM;
123
124 platform_set_drvdata(dev, hcd);
125 dev->dev.platform_data = pdata;
126 priv = hcd_to_ohci_priv(hcd);
127 ohci = hcd_to_ohci(hcd);
128
129 if (pdata == &ohci_platform_defaults && dev->dev.of_node) {
130 if (of_property_read_bool(dev->dev.of_node, "big-endian-regs"))
131 ohci->flags |= OHCI_QUIRK_BE_MMIO;
132
133 if (of_property_read_bool(dev->dev.of_node, "big-endian-desc"))
134 ohci->flags |= OHCI_QUIRK_BE_DESC;
135
136 if (of_property_read_bool(dev->dev.of_node, "big-endian"))
137 ohci->flags |= OHCI_QUIRK_BE_MMIO | OHCI_QUIRK_BE_DESC;
138
139 if (of_property_read_bool(dev->dev.of_node, "no-big-frame-no"))
140 ohci->flags |= OHCI_QUIRK_FRAME_NO;
141
142 if (of_property_read_bool(dev->dev.of_node,
143 "remote-wakeup-connected"))
144 ohci->hc_control = OHCI_CTRL_RWC;
145
146 of_property_read_u32(dev->dev.of_node, "num-ports",
147 &ohci->num_ports);
148
149 for (clk = 0; clk < OHCI_MAX_CLKS; clk++) {
150 priv->clks[clk] = of_clk_get(dev->dev.of_node, clk);
151 if (IS_ERR(priv->clks[clk])) {
152 err = PTR_ERR(priv->clks[clk]);
153 if (err == -EPROBE_DEFER)
154 goto err_put_clks;
155 priv->clks[clk] = NULL;
156 break;
157 }
158 }
159
160 priv->resets = devm_reset_control_array_get_optional_shared(
161 &dev->dev);
162 if (IS_ERR(priv->resets)) {
163 err = PTR_ERR(priv->resets);
164 goto err_put_clks;
165 }
166
167 err = reset_control_deassert(priv->resets);
168 if (err)
169 goto err_put_clks;
170 }
171
172 if (pdata->big_endian_desc)
173 ohci->flags |= OHCI_QUIRK_BE_DESC;
174 if (pdata->big_endian_mmio)
175 ohci->flags |= OHCI_QUIRK_BE_MMIO;
176 if (pdata->no_big_frame_no)
177 ohci->flags |= OHCI_QUIRK_FRAME_NO;
178 if (pdata->num_ports)
179 ohci->num_ports = pdata->num_ports;
180
181#ifndef CONFIG_USB_OHCI_BIG_ENDIAN_MMIO
182 if (ohci->flags & OHCI_QUIRK_BE_MMIO) {
183 dev_err(&dev->dev,
184 "Error: CONFIG_USB_OHCI_BIG_ENDIAN_MMIO not set\n");
185 err = -EINVAL;
186 goto err_reset;
187 }
188#endif
189#ifndef CONFIG_USB_OHCI_BIG_ENDIAN_DESC
190 if (ohci->flags & OHCI_QUIRK_BE_DESC) {
191 dev_err(&dev->dev,
192 "Error: CONFIG_USB_OHCI_BIG_ENDIAN_DESC not set\n");
193 err = -EINVAL;
194 goto err_reset;
195 }
196#endif
197
198 pm_runtime_set_active(&dev->dev);
199 pm_runtime_enable(&dev->dev);
200 if (pdata->power_on) {
201 err = pdata->power_on(dev);
202 if (err < 0)
203 goto err_reset;
204 }
205
206 res_mem = platform_get_resource(dev, IORESOURCE_MEM, 0);
207 hcd->regs = devm_ioremap_resource(&dev->dev, res_mem);
208 if (IS_ERR(hcd->regs)) {
209 err = PTR_ERR(hcd->regs);
210 goto err_power;
211 }
212 hcd->rsrc_start = res_mem->start;
213 hcd->rsrc_len = resource_size(res_mem);
214
215 err = usb_add_hcd(hcd, irq, IRQF_SHARED);
216 if (err)
217 goto err_power;
218
219 device_wakeup_enable(hcd->self.controller);
220
221 platform_set_drvdata(dev, hcd);
222
223 return err;
224
225err_power:
226 if (pdata->power_off)
227 pdata->power_off(dev);
228err_reset:
229 pm_runtime_disable(&dev->dev);
230 reset_control_assert(priv->resets);
231err_put_clks:
232 while (--clk >= 0)
233 clk_put(priv->clks[clk]);
234
235 if (pdata == &ohci_platform_defaults)
236 dev->dev.platform_data = NULL;
237
238 usb_put_hcd(hcd);
239
240 return err;
241}
242
243static int ohci_platform_remove(struct platform_device *dev)
244{
245 struct usb_hcd *hcd = platform_get_drvdata(dev);
246 struct usb_ohci_pdata *pdata = dev_get_platdata(&dev->dev);
247 struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
248 int clk;
249
250 pm_runtime_get_sync(&dev->dev);
251 usb_remove_hcd(hcd);
252
253 if (pdata->power_off)
254 pdata->power_off(dev);
255
256 reset_control_assert(priv->resets);
257
258 for (clk = 0; clk < OHCI_MAX_CLKS && priv->clks[clk]; clk++)
259 clk_put(priv->clks[clk]);
260
261 usb_put_hcd(hcd);
262
263 pm_runtime_put_sync(&dev->dev);
264 pm_runtime_disable(&dev->dev);
265
266 if (pdata == &ohci_platform_defaults)
267 dev->dev.platform_data = NULL;
268
269 return 0;
270}
271
272#ifdef CONFIG_PM_SLEEP
273static int ohci_platform_suspend(struct device *dev)
274{
275 struct usb_hcd *hcd = dev_get_drvdata(dev);
276 struct usb_ohci_pdata *pdata = dev->platform_data;
277 struct platform_device *pdev = to_platform_device(dev);
278 bool do_wakeup = device_may_wakeup(dev);
279 int ret;
280
281 ret = ohci_suspend(hcd, do_wakeup);
282 if (ret)
283 return ret;
284
285 if (pdata->power_suspend)
286 pdata->power_suspend(pdev);
287
288 return ret;
289}
290
291static int ohci_platform_resume(struct device *dev)
292{
293 struct usb_hcd *hcd = dev_get_drvdata(dev);
294 struct usb_ohci_pdata *pdata = dev_get_platdata(dev);
295 struct platform_device *pdev = to_platform_device(dev);
296
297 if (pdata->power_on) {
298 int err = pdata->power_on(pdev);
299 if (err < 0)
300 return err;
301 }
302
303 ohci_resume(hcd, false);
304 return 0;
305}
306#endif
307
308static const struct of_device_id ohci_platform_ids[] = {
309 { .compatible = "generic-ohci", },
310 { .compatible = "cavium,octeon-6335-ohci", },
311 { .compatible = "ti,ohci-omap3", },
312 { }
313};
314MODULE_DEVICE_TABLE(of, ohci_platform_ids);
315
316static const struct platform_device_id ohci_platform_table[] = {
317 { "ohci-platform", 0 },
318 { }
319};
320MODULE_DEVICE_TABLE(platform, ohci_platform_table);
321
322static SIMPLE_DEV_PM_OPS(ohci_platform_pm_ops, ohci_platform_suspend,
323 ohci_platform_resume);
324
325static struct platform_driver ohci_platform_driver = {
326 .id_table = ohci_platform_table,
327 .probe = ohci_platform_probe,
328 .remove = ohci_platform_remove,
329 .shutdown = usb_hcd_platform_shutdown,
330 .driver = {
331 .name = "ohci-platform",
332 .pm = &ohci_platform_pm_ops,
333 .of_match_table = ohci_platform_ids,
334 }
335};
336
337static int __init ohci_platform_init(void)
338{
339 if (usb_disabled())
340 return -ENODEV;
341
342 pr_info("%s: " DRIVER_DESC "\n", hcd_name);
343
344 ohci_init_driver(&ohci_platform_hc_driver, &platform_overrides);
345 return platform_driver_register(&ohci_platform_driver);
346}
347module_init(ohci_platform_init);
348
349static void __exit ohci_platform_cleanup(void)
350{
351 platform_driver_unregister(&ohci_platform_driver);
352}
353module_exit(ohci_platform_cleanup);
354
355MODULE_DESCRIPTION(DRIVER_DESC);
356MODULE_AUTHOR("Hauke Mehrtens");
357MODULE_AUTHOR("Alan Stern");
358MODULE_LICENSE("GPL");
359
