1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Generic platform ehci driver
4 *
5 * Copyright 2007 Steven Brown <sbrown@cortland.com>
6 * Copyright 2010-2012 Hauke Mehrtens <hauke@hauke-m.de>
7 * Copyright 2014 Hans de Goede <hdegoede@redhat.com>
8 *
9 * Derived from the ohci-ssb driver
10 * Copyright 2007 Michael Buesch <m@bues.ch>
11 *
12 * Derived from the EHCI-PCI driver
13 * Copyright (c) 2000-2004 by David Brownell
14 *
15 * Derived from the ohci-pci driver
16 * Copyright 1999 Roman Weissgaerber
17 * Copyright 2000-2002 David Brownell
18 * Copyright 1999 Linus Torvalds
19 * Copyright 1999 Gregory P. Smith
20 */
21 #include <linux/acpi.h>
22 #include <linux/clk.h>
23 #include <linux/dma-mapping.h>
24 #include <linux/err.h>
25 #include <linux/kernel.h>
26 #include <linux/hrtimer.h>
27 #include <linux/io.h>
28 #include <linux/module.h>
29 #include <linux/of.h>
30 #include <linux/platform_device.h>
31 #include <linux/reset.h>
32 #include <linux/sys_soc.h>
33 #include <linux/timer.h>
34 #include <linux/usb.h>
35 #include <linux/usb/hcd.h>
36 #include <linux/usb/ehci_pdriver.h>
37 #include <linux/usb/of.h>
38
39 #include "ehci.h"
40
41 #define DRIVER_DESC "EHCI generic platform driver"
42 #define EHCI_MAX_CLKS 4
43 #define hcd_to_ehci_priv(h) ((struct ehci_platform_priv *)hcd_to_ehci(h)->priv)
44
45 #define BCM_USB_FIFO_THRESHOLD 0x00800040
46
47 struct ehci_platform_priv {
48 struct clk *clks[EHCI_MAX_CLKS];
49 struct reset_control *rsts;
50 bool reset_on_resume;
51 bool quirk_poll;
52 struct timer_list poll_timer;
53 struct delayed_work poll_work;
54 };
55
ehci_platform_reset(struct usb_hcd * hcd)56 static int ehci_platform_reset(struct usb_hcd *hcd)
57 {
58 struct platform_device *pdev = to_platform_device(hcd->self.controller);
59 struct usb_ehci_pdata *pdata = dev_get_platdata(&pdev->dev);
60 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
61 int retval;
62
63 ehci->has_synopsys_hc_bug = pdata->has_synopsys_hc_bug;
64
65 if (pdata->pre_setup) {
66 retval = pdata->pre_setup(hcd);
67 if (retval < 0)
68 return retval;
69 }
70
71 ehci->caps = hcd->regs + pdata->caps_offset;
72 retval = ehci_setup(hcd);
73 if (retval)
74 return retval;
75
76 if (pdata->no_io_watchdog)
77 ehci->need_io_watchdog = 0;
78
79 if (of_device_is_compatible(pdev->dev.of_node, "brcm,xgs-iproc-ehci"))
80 ehci_writel(ehci, BCM_USB_FIFO_THRESHOLD,
81 &ehci->regs->brcm_insnreg[1]);
82
83 return 0;
84 }
85
ehci_platform_power_on(struct platform_device * dev)86 static int ehci_platform_power_on(struct platform_device *dev)
87 {
88 struct usb_hcd *hcd = platform_get_drvdata(dev);
89 struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
90 int clk, ret;
91
92 for (clk = 0; clk < EHCI_MAX_CLKS && priv->clks[clk]; clk++) {
93 ret = clk_prepare_enable(priv->clks[clk]);
94 if (ret)
95 goto err_disable_clks;
96 }
97
98 return 0;
99
100 err_disable_clks:
101 while (--clk >= 0)
102 clk_disable_unprepare(priv->clks[clk]);
103
104 return ret;
105 }
106
ehci_platform_power_off(struct platform_device * dev)107 static void ehci_platform_power_off(struct platform_device *dev)
108 {
109 struct usb_hcd *hcd = platform_get_drvdata(dev);
110 struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
111 int clk;
112
113 for (clk = EHCI_MAX_CLKS - 1; clk >= 0; clk--)
114 if (priv->clks[clk])
115 clk_disable_unprepare(priv->clks[clk]);
116 }
117
118 static struct hc_driver __read_mostly ehci_platform_hc_driver;
119
120 static const struct ehci_driver_overrides platform_overrides __initconst = {
121 .reset = ehci_platform_reset,
122 .extra_priv_size = sizeof(struct ehci_platform_priv),
123 };
124
125 static struct usb_ehci_pdata ehci_platform_defaults = {
126 .power_on = ehci_platform_power_on,
127 .power_suspend = ehci_platform_power_off,
128 .power_off = ehci_platform_power_off,
129 };
130
131 /**
132 * quirk_poll_check_port_status - Poll port_status if the device sticks
133 * @ehci: the ehci hcd pointer
134 *
135 * Since EHCI/OHCI controllers on R-Car Gen3 SoCs are possible to be getting
136 * stuck very rarely after a full/low usb device was disconnected. To
137 * detect such a situation, the controllers require a special way which poll
138 * the EHCI PORTSC register.
139 *
140 * Return: true if the controller's port_status indicated getting stuck
141 */
quirk_poll_check_port_status(struct ehci_hcd * ehci)142 static bool quirk_poll_check_port_status(struct ehci_hcd *ehci)
143 {
144 u32 port_status = ehci_readl(ehci, &ehci->regs->port_status[0]);
145
146 if (!(port_status & PORT_OWNER) &&
147 (port_status & PORT_POWER) &&
148 !(port_status & PORT_CONNECT) &&
149 (port_status & PORT_LS_MASK))
150 return true;
151
152 return false;
153 }
154
155 /**
156 * quirk_poll_rebind_companion - rebind comanion device to recover
157 * @ehci: the ehci hcd pointer
158 *
159 * Since EHCI/OHCI controllers on R-Car Gen3 SoCs are possible to be getting
160 * stuck very rarely after a full/low usb device was disconnected. To
161 * recover from such a situation, the controllers require changing the OHCI
162 * functional state.
163 */
quirk_poll_rebind_companion(struct ehci_hcd * ehci)164 static void quirk_poll_rebind_companion(struct ehci_hcd *ehci)
165 {
166 struct device *companion_dev;
167 struct usb_hcd *hcd = ehci_to_hcd(ehci);
168
169 companion_dev = usb_of_get_companion_dev(hcd->self.controller);
170 if (!companion_dev)
171 return;
172
173 device_release_driver(companion_dev);
174 if (device_attach(companion_dev) < 0)
175 ehci_err(ehci, "%s: failed\n", __func__);
176
177 put_device(companion_dev);
178 }
179
quirk_poll_work(struct work_struct * work)180 static void quirk_poll_work(struct work_struct *work)
181 {
182 struct ehci_platform_priv *priv =
183 container_of(to_delayed_work(work), struct ehci_platform_priv,
184 poll_work);
185 struct ehci_hcd *ehci = container_of((void *)priv, struct ehci_hcd,
186 priv);
187
188 /* check the status twice to reduce misdetection rate */
189 if (!quirk_poll_check_port_status(ehci))
190 return;
191 udelay(10);
192 if (!quirk_poll_check_port_status(ehci))
193 return;
194
195 ehci_dbg(ehci, "%s: detected getting stuck. rebind now!\n", __func__);
196 quirk_poll_rebind_companion(ehci);
197 }
198
quirk_poll_timer(struct timer_list * t)199 static void quirk_poll_timer(struct timer_list *t)
200 {
201 struct ehci_platform_priv *priv = from_timer(priv, t, poll_timer);
202 struct ehci_hcd *ehci = container_of((void *)priv, struct ehci_hcd,
203 priv);
204
205 if (quirk_poll_check_port_status(ehci)) {
206 /*
207 * Now scheduling the work for testing the port more. Note that
208 * updating the status is possible to be delayed when
209 * reconnection. So, this uses delayed work with 5 ms delay
210 * to avoid misdetection.
211 */
212 schedule_delayed_work(&priv->poll_work, msecs_to_jiffies(5));
213 }
214
215 mod_timer(&priv->poll_timer, jiffies + HZ);
216 }
217
quirk_poll_init(struct ehci_platform_priv * priv)218 static void quirk_poll_init(struct ehci_platform_priv *priv)
219 {
220 INIT_DELAYED_WORK(&priv->poll_work, quirk_poll_work);
221 timer_setup(&priv->poll_timer, quirk_poll_timer, 0);
222 mod_timer(&priv->poll_timer, jiffies + HZ);
223 }
224
quirk_poll_end(struct ehci_platform_priv * priv)225 static void quirk_poll_end(struct ehci_platform_priv *priv)
226 {
227 del_timer_sync(&priv->poll_timer);
228 cancel_delayed_work(&priv->poll_work);
229 }
230
231 static const struct soc_device_attribute quirk_poll_match[] = {
232 { .family = "R-Car Gen3" },
233 { /* sentinel*/ }
234 };
235
ehci_platform_probe(struct platform_device * dev)236 static int ehci_platform_probe(struct platform_device *dev)
237 {
238 struct usb_hcd *hcd;
239 struct resource *res_mem;
240 struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev);
241 struct ehci_platform_priv *priv;
242 struct ehci_hcd *ehci;
243 int err, irq, clk = 0;
244
245 if (usb_disabled())
246 return -ENODEV;
247
248 /*
249 * Use reasonable defaults so platforms don't have to provide these
250 * with DT probing on ARM.
251 */
252 if (!pdata)
253 pdata = &ehci_platform_defaults;
254
255 err = dma_coerce_mask_and_coherent(&dev->dev,
256 pdata->dma_mask_64 ? DMA_BIT_MASK(64) : DMA_BIT_MASK(32));
257 if (err) {
258 dev_err(&dev->dev, "Error: DMA mask configuration failed\n");
259 return err;
260 }
261
262 irq = platform_get_irq(dev, 0);
263 if (irq < 0)
264 return irq;
265
266 hcd = usb_create_hcd(&ehci_platform_hc_driver, &dev->dev,
267 dev_name(&dev->dev));
268 if (!hcd)
269 return -ENOMEM;
270
271 platform_set_drvdata(dev, hcd);
272 dev->dev.platform_data = pdata;
273 priv = hcd_to_ehci_priv(hcd);
274 ehci = hcd_to_ehci(hcd);
275
276 if (pdata == &ehci_platform_defaults && dev->dev.of_node) {
277 if (of_property_read_bool(dev->dev.of_node, "big-endian-regs"))
278 ehci->big_endian_mmio = 1;
279
280 if (of_property_read_bool(dev->dev.of_node, "big-endian-desc"))
281 ehci->big_endian_desc = 1;
282
283 if (of_property_read_bool(dev->dev.of_node, "big-endian"))
284 ehci->big_endian_mmio = ehci->big_endian_desc = 1;
285
286 if (of_property_read_bool(dev->dev.of_node, "spurious-oc"))
287 ehci->spurious_oc = 1;
288
289 if (of_property_read_bool(dev->dev.of_node,
290 "needs-reset-on-resume"))
291 priv->reset_on_resume = true;
292
293 if (of_property_read_bool(dev->dev.of_node,
294 "has-transaction-translator"))
295 hcd->has_tt = 1;
296
297 if (of_device_is_compatible(dev->dev.of_node,
298 "aspeed,ast2500-ehci") ||
299 of_device_is_compatible(dev->dev.of_node,
300 "aspeed,ast2600-ehci"))
301 ehci->is_aspeed = 1;
302
303 if (soc_device_match(quirk_poll_match))
304 priv->quirk_poll = true;
305
306 for (clk = 0; clk < EHCI_MAX_CLKS; clk++) {
307 priv->clks[clk] = of_clk_get(dev->dev.of_node, clk);
308 if (IS_ERR(priv->clks[clk])) {
309 err = PTR_ERR(priv->clks[clk]);
310 if (err == -EPROBE_DEFER)
311 goto err_put_clks;
312 priv->clks[clk] = NULL;
313 break;
314 }
315 }
316 }
317
318 priv->rsts = devm_reset_control_array_get_optional_shared(&dev->dev);
319 if (IS_ERR(priv->rsts)) {
320 err = PTR_ERR(priv->rsts);
321 goto err_put_clks;
322 }
323
324 err = reset_control_deassert(priv->rsts);
325 if (err)
326 goto err_put_clks;
327
328 if (pdata->big_endian_desc)
329 ehci->big_endian_desc = 1;
330 if (pdata->big_endian_mmio)
331 ehci->big_endian_mmio = 1;
332 if (pdata->has_tt)
333 hcd->has_tt = 1;
334 if (pdata->reset_on_resume)
335 priv->reset_on_resume = true;
336 if (pdata->spurious_oc)
337 ehci->spurious_oc = 1;
338
339 #ifndef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
340 if (ehci->big_endian_mmio) {
341 dev_err(&dev->dev,
342 "Error: CONFIG_USB_EHCI_BIG_ENDIAN_MMIO not set\n");
343 err = -EINVAL;
344 goto err_reset;
345 }
346 #endif
347 #ifndef CONFIG_USB_EHCI_BIG_ENDIAN_DESC
348 if (ehci->big_endian_desc) {
349 dev_err(&dev->dev,
350 "Error: CONFIG_USB_EHCI_BIG_ENDIAN_DESC not set\n");
351 err = -EINVAL;
352 goto err_reset;
353 }
354 #endif
355
356 if (pdata->power_on) {
357 err = pdata->power_on(dev);
358 if (err < 0)
359 goto err_reset;
360 }
361
362 hcd->regs = devm_platform_get_and_ioremap_resource(dev, 0, &res_mem);
363 if (IS_ERR(hcd->regs)) {
364 err = PTR_ERR(hcd->regs);
365 goto err_power;
366 }
367 hcd->rsrc_start = res_mem->start;
368 hcd->rsrc_len = resource_size(res_mem);
369
370 hcd->tpl_support = of_usb_host_tpl_support(dev->dev.of_node);
371
372 err = usb_add_hcd(hcd, irq, IRQF_SHARED);
373 if (err)
374 goto err_power;
375
376 device_wakeup_enable(hcd->self.controller);
377 device_enable_async_suspend(hcd->self.controller);
378 platform_set_drvdata(dev, hcd);
379
380 if (priv->quirk_poll)
381 quirk_poll_init(priv);
382
383 return err;
384
385 err_power:
386 if (pdata->power_off)
387 pdata->power_off(dev);
388 err_reset:
389 reset_control_assert(priv->rsts);
390 err_put_clks:
391 while (--clk >= 0)
392 clk_put(priv->clks[clk]);
393
394 if (pdata == &ehci_platform_defaults)
395 dev->dev.platform_data = NULL;
396
397 usb_put_hcd(hcd);
398
399 return err;
400 }
401
ehci_platform_remove(struct platform_device * dev)402 static void ehci_platform_remove(struct platform_device *dev)
403 {
404 struct usb_hcd *hcd = platform_get_drvdata(dev);
405 struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev);
406 struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
407 int clk;
408
409 if (priv->quirk_poll)
410 quirk_poll_end(priv);
411
412 usb_remove_hcd(hcd);
413
414 if (pdata->power_off)
415 pdata->power_off(dev);
416
417 reset_control_assert(priv->rsts);
418
419 for (clk = 0; clk < EHCI_MAX_CLKS && priv->clks[clk]; clk++)
420 clk_put(priv->clks[clk]);
421
422 usb_put_hcd(hcd);
423
424 if (pdata == &ehci_platform_defaults)
425 dev->dev.platform_data = NULL;
426 }
427
ehci_platform_suspend(struct device * dev)428 static int __maybe_unused ehci_platform_suspend(struct device *dev)
429 {
430 struct usb_hcd *hcd = dev_get_drvdata(dev);
431 struct usb_ehci_pdata *pdata = dev_get_platdata(dev);
432 struct platform_device *pdev = to_platform_device(dev);
433 struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
434 bool do_wakeup = device_may_wakeup(dev);
435 int ret;
436
437 if (priv->quirk_poll)
438 quirk_poll_end(priv);
439
440 ret = ehci_suspend(hcd, do_wakeup);
441 if (ret)
442 return ret;
443
444 if (pdata->power_suspend)
445 pdata->power_suspend(pdev);
446
447 return ret;
448 }
449
ehci_platform_resume(struct device * dev)450 static int __maybe_unused ehci_platform_resume(struct device *dev)
451 {
452 struct usb_hcd *hcd = dev_get_drvdata(dev);
453 struct usb_ehci_pdata *pdata = dev_get_platdata(dev);
454 struct platform_device *pdev = to_platform_device(dev);
455 struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
456 struct device *companion_dev;
457
458 if (pdata->power_on) {
459 int err = pdata->power_on(pdev);
460 if (err < 0)
461 return err;
462 }
463
464 companion_dev = usb_of_get_companion_dev(hcd->self.controller);
465 if (companion_dev) {
466 device_pm_wait_for_dev(hcd->self.controller, companion_dev);
467 put_device(companion_dev);
468 }
469
470 ehci_resume(hcd, priv->reset_on_resume);
471
472 pm_runtime_disable(dev);
473 pm_runtime_set_active(dev);
474 pm_runtime_enable(dev);
475
476 if (priv->quirk_poll)
477 quirk_poll_init(priv);
478
479 return 0;
480 }
481
482 static const struct of_device_id vt8500_ehci_ids[] = {
483 { .compatible = "via,vt8500-ehci", },
484 { .compatible = "wm,prizm-ehci", },
485 { .compatible = "generic-ehci", },
486 { .compatible = "cavium,octeon-6335-ehci", },
487 {}
488 };
489 MODULE_DEVICE_TABLE(of, vt8500_ehci_ids);
490
491 #ifdef CONFIG_ACPI
492 static const struct acpi_device_id ehci_acpi_match[] = {
493 { "PNP0D20", 0 }, /* EHCI controller without debug */
494 { }
495 };
496 MODULE_DEVICE_TABLE(acpi, ehci_acpi_match);
497 #endif
498
499 static const struct platform_device_id ehci_platform_table[] = {
500 { "ehci-platform", 0 },
501 { }
502 };
503 MODULE_DEVICE_TABLE(platform, ehci_platform_table);
504
505 static SIMPLE_DEV_PM_OPS(ehci_platform_pm_ops, ehci_platform_suspend,
506 ehci_platform_resume);
507
508 static struct platform_driver ehci_platform_driver = {
509 .id_table = ehci_platform_table,
510 .probe = ehci_platform_probe,
511 .remove_new = ehci_platform_remove,
512 .shutdown = usb_hcd_platform_shutdown,
513 .driver = {
514 .name = "ehci-platform",
515 .pm = pm_ptr(&ehci_platform_pm_ops),
516 .of_match_table = vt8500_ehci_ids,
517 .acpi_match_table = ACPI_PTR(ehci_acpi_match),
518 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
519 }
520 };
521
ehci_platform_init(void)522 static int __init ehci_platform_init(void)
523 {
524 if (usb_disabled())
525 return -ENODEV;
526
527 ehci_init_driver(&ehci_platform_hc_driver, &platform_overrides);
528 return platform_driver_register(&ehci_platform_driver);
529 }
530 module_init(ehci_platform_init);
531
ehci_platform_cleanup(void)532 static void __exit ehci_platform_cleanup(void)
533 {
534 platform_driver_unregister(&ehci_platform_driver);
535 }
536 module_exit(ehci_platform_cleanup);
537
538 MODULE_DESCRIPTION(DRIVER_DESC);
539 MODULE_AUTHOR("Hauke Mehrtens");
540 MODULE_AUTHOR("Alan Stern");
541 MODULE_LICENSE("GPL");
542
