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powerpc/fadump: Do not allow hot-remove memory from fadump reserved area.
[linux/fpc-iii.git] / drivers / usb / dwc3 / dwc3-qcom.c
bloba6d0203e40b6e048bfb736133321ef6c857c09ca
1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2018, The Linux Foundation. All rights reserved.
3 *
4 * Inspired by dwc3-of-simple.c
5 */
6
7 #include <linux/io.h>
8 #include <linux/of.h>
9 #include <linux/clk.h>
10 #include <linux/irq.h>
11 #include <linux/clk-provider.h>
12 #include <linux/module.h>
13 #include <linux/kernel.h>
14 #include <linux/extcon.h>
15 #include <linux/of_platform.h>
16 #include <linux/platform_device.h>
17 #include <linux/phy/phy.h>
18 #include <linux/usb/of.h>
19 #include <linux/reset.h>
20 #include <linux/iopoll.h>
21
22 #include "core.h"
23
24 /* USB QSCRATCH Hardware registers */
25 #define QSCRATCH_HS_PHY_CTRL 0x10
26 #define UTMI_OTG_VBUS_VALID BIT(20)
27 #define SW_SESSVLD_SEL BIT(28)
28
29 #define QSCRATCH_SS_PHY_CTRL 0x30
30 #define LANE0_PWR_PRESENT BIT(24)
31
32 #define QSCRATCH_GENERAL_CFG 0x08
33 #define PIPE_UTMI_CLK_SEL BIT(0)
34 #define PIPE3_PHYSTATUS_SW BIT(3)
35 #define PIPE_UTMI_CLK_DIS BIT(8)
36
37 #define PWR_EVNT_IRQ_STAT_REG 0x58
38 #define PWR_EVNT_LPM_IN_L2_MASK BIT(4)
39 #define PWR_EVNT_LPM_OUT_L2_MASK BIT(5)
40
41 struct dwc3_qcom {
42 struct device *dev;
43 void __iomem *qscratch_base;
44 struct platform_device *dwc3;
45 struct clk **clks;
46 int num_clocks;
47 struct reset_control *resets;
48
49 int hs_phy_irq;
50 int dp_hs_phy_irq;
51 int dm_hs_phy_irq;
52 int ss_phy_irq;
53
54 struct extcon_dev *edev;
55 struct extcon_dev *host_edev;
56 struct notifier_block vbus_nb;
57 struct notifier_block host_nb;
58
59 enum usb_dr_mode mode;
60 bool is_suspended;
61 bool pm_suspended;
62 };
63
64 static inline void dwc3_qcom_setbits(void __iomem *base, u32 offset, u32 val)
65 {
66 u32 reg;
67
68 reg = readl(base + offset);
69 reg |= val;
70 writel(reg, base + offset);
71
72 /* ensure that above write is through */
73 readl(base + offset);
74 }
75
76 static inline void dwc3_qcom_clrbits(void __iomem *base, u32 offset, u32 val)
77 {
78 u32 reg;
79
80 reg = readl(base + offset);
81 reg &= ~val;
82 writel(reg, base + offset);
83
84 /* ensure that above write is through */
85 readl(base + offset);
86 }
87
88 static void dwc3_qcom_vbus_overrride_enable(struct dwc3_qcom *qcom, bool enable)
89 {
90 if (enable) {
91 dwc3_qcom_setbits(qcom->qscratch_base, QSCRATCH_SS_PHY_CTRL,
92 LANE0_PWR_PRESENT);
93 dwc3_qcom_setbits(qcom->qscratch_base, QSCRATCH_HS_PHY_CTRL,
94 UTMI_OTG_VBUS_VALID | SW_SESSVLD_SEL);
95 } else {
96 dwc3_qcom_clrbits(qcom->qscratch_base, QSCRATCH_SS_PHY_CTRL,
97 LANE0_PWR_PRESENT);
98 dwc3_qcom_clrbits(qcom->qscratch_base, QSCRATCH_HS_PHY_CTRL,
99 UTMI_OTG_VBUS_VALID | SW_SESSVLD_SEL);
100 }
101 }
102
103 static int dwc3_qcom_vbus_notifier(struct notifier_block *nb,
104 unsigned long event, void *ptr)
105 {
106 struct dwc3_qcom *qcom = container_of(nb, struct dwc3_qcom, vbus_nb);
107
108 /* enable vbus override for device mode */
109 dwc3_qcom_vbus_overrride_enable(qcom, event);
110 qcom->mode = event ? USB_DR_MODE_PERIPHERAL : USB_DR_MODE_HOST;
111
112 return NOTIFY_DONE;
113 }
114
115 static int dwc3_qcom_host_notifier(struct notifier_block *nb,
116 unsigned long event, void *ptr)
117 {
118 struct dwc3_qcom *qcom = container_of(nb, struct dwc3_qcom, host_nb);
119
120 /* disable vbus override in host mode */
121 dwc3_qcom_vbus_overrride_enable(qcom, !event);
122 qcom->mode = event ? USB_DR_MODE_HOST : USB_DR_MODE_PERIPHERAL;
123
124 return NOTIFY_DONE;
125 }
126
127 static int dwc3_qcom_register_extcon(struct dwc3_qcom *qcom)
128 {
129 struct device *dev = qcom->dev;
130 struct extcon_dev *host_edev;
131 int ret;
132
133 if (!of_property_read_bool(dev->of_node, "extcon"))
134 return 0;
135
136 qcom->edev = extcon_get_edev_by_phandle(dev, 0);
137 if (IS_ERR(qcom->edev))
138 return PTR_ERR(qcom->edev);
139
140 qcom->vbus_nb.notifier_call = dwc3_qcom_vbus_notifier;
141
142 qcom->host_edev = extcon_get_edev_by_phandle(dev, 1);
143 if (IS_ERR(qcom->host_edev))
144 qcom->host_edev = NULL;
145
146 ret = devm_extcon_register_notifier(dev, qcom->edev, EXTCON_USB,
147 &qcom->vbus_nb);
148 if (ret < 0) {
149 dev_err(dev, "VBUS notifier register failed\n");
150 return ret;
151 }
152
153 if (qcom->host_edev)
154 host_edev = qcom->host_edev;
155 else
156 host_edev = qcom->edev;
157
158 qcom->host_nb.notifier_call = dwc3_qcom_host_notifier;
159 ret = devm_extcon_register_notifier(dev, host_edev, EXTCON_USB_HOST,
160 &qcom->host_nb);
161 if (ret < 0) {
162 dev_err(dev, "Host notifier register failed\n");
163 return ret;
164 }
165
166 /* Update initial VBUS override based on extcon state */
167 if (extcon_get_state(qcom->edev, EXTCON_USB) ||
168 !extcon_get_state(host_edev, EXTCON_USB_HOST))
169 dwc3_qcom_vbus_notifier(&qcom->vbus_nb, true, qcom->edev);
170 else
171 dwc3_qcom_vbus_notifier(&qcom->vbus_nb, false, qcom->edev);
172
173 return 0;
174 }
175
176 static void dwc3_qcom_disable_interrupts(struct dwc3_qcom *qcom)
177 {
178 if (qcom->hs_phy_irq) {
179 disable_irq_wake(qcom->hs_phy_irq);
180 disable_irq_nosync(qcom->hs_phy_irq);
181 }
182
183 if (qcom->dp_hs_phy_irq) {
184 disable_irq_wake(qcom->dp_hs_phy_irq);
185 disable_irq_nosync(qcom->dp_hs_phy_irq);
186 }
187
188 if (qcom->dm_hs_phy_irq) {
189 disable_irq_wake(qcom->dm_hs_phy_irq);
190 disable_irq_nosync(qcom->dm_hs_phy_irq);
191 }
192
193 if (qcom->ss_phy_irq) {
194 disable_irq_wake(qcom->ss_phy_irq);
195 disable_irq_nosync(qcom->ss_phy_irq);
196 }
197 }
198
199 static void dwc3_qcom_enable_interrupts(struct dwc3_qcom *qcom)
200 {
201 if (qcom->hs_phy_irq) {
202 enable_irq(qcom->hs_phy_irq);
203 enable_irq_wake(qcom->hs_phy_irq);
204 }
205
206 if (qcom->dp_hs_phy_irq) {
207 enable_irq(qcom->dp_hs_phy_irq);
208 enable_irq_wake(qcom->dp_hs_phy_irq);
209 }
210
211 if (qcom->dm_hs_phy_irq) {
212 enable_irq(qcom->dm_hs_phy_irq);
213 enable_irq_wake(qcom->dm_hs_phy_irq);
214 }
215
216 if (qcom->ss_phy_irq) {
217 enable_irq(qcom->ss_phy_irq);
218 enable_irq_wake(qcom->ss_phy_irq);
219 }
220 }
221
222 static int dwc3_qcom_suspend(struct dwc3_qcom *qcom)
223 {
224 u32 val;
225 int i;
226
227 if (qcom->is_suspended)
228 return 0;
229
230 val = readl(qcom->qscratch_base + PWR_EVNT_IRQ_STAT_REG);
231 if (!(val & PWR_EVNT_LPM_IN_L2_MASK))
232 dev_err(qcom->dev, "HS-PHY not in L2\n");
233
234 for (i = qcom->num_clocks - 1; i >= 0; i--)
235 clk_disable_unprepare(qcom->clks[i]);
236
237 qcom->is_suspended = true;
238 dwc3_qcom_enable_interrupts(qcom);
239
240 return 0;
241 }
242
243 static int dwc3_qcom_resume(struct dwc3_qcom *qcom)
244 {
245 int ret;
246 int i;
247
248 if (!qcom->is_suspended)
249 return 0;
250
251 dwc3_qcom_disable_interrupts(qcom);
252
253 for (i = 0; i < qcom->num_clocks; i++) {
254 ret = clk_prepare_enable(qcom->clks[i]);
255 if (ret < 0) {
256 while (--i >= 0)
257 clk_disable_unprepare(qcom->clks[i]);
258 return ret;
259 }
260 }
261
262 /* Clear existing events from PHY related to L2 in/out */
263 dwc3_qcom_setbits(qcom->qscratch_base, PWR_EVNT_IRQ_STAT_REG,
264 PWR_EVNT_LPM_IN_L2_MASK | PWR_EVNT_LPM_OUT_L2_MASK);
265
266 qcom->is_suspended = false;
267
268 return 0;
269 }
270
271 static irqreturn_t qcom_dwc3_resume_irq(int irq, void *data)
272 {
273 struct dwc3_qcom *qcom = data;
274 struct dwc3 *dwc = platform_get_drvdata(qcom->dwc3);
275
276 /* If pm_suspended then let pm_resume take care of resuming h/w */
277 if (qcom->pm_suspended)
278 return IRQ_HANDLED;
279
280 if (dwc->xhci)
281 pm_runtime_resume(&dwc->xhci->dev);
282
283 return IRQ_HANDLED;
284 }
285
286 static void dwc3_qcom_select_utmi_clk(struct dwc3_qcom *qcom)
287 {
288 /* Configure dwc3 to use UTMI clock as PIPE clock not present */
289 dwc3_qcom_setbits(qcom->qscratch_base, QSCRATCH_GENERAL_CFG,
290 PIPE_UTMI_CLK_DIS);
291
292 usleep_range(100, 1000);
293
294 dwc3_qcom_setbits(qcom->qscratch_base, QSCRATCH_GENERAL_CFG,
295 PIPE_UTMI_CLK_SEL | PIPE3_PHYSTATUS_SW);
296
297 usleep_range(100, 1000);
298
299 dwc3_qcom_clrbits(qcom->qscratch_base, QSCRATCH_GENERAL_CFG,
300 PIPE_UTMI_CLK_DIS);
301 }
302
303 static int dwc3_qcom_setup_irq(struct platform_device *pdev)
304 {
305 struct dwc3_qcom *qcom = platform_get_drvdata(pdev);
306 int irq, ret;
307
308 irq = platform_get_irq_byname(pdev, "hs_phy_irq");
309 if (irq > 0) {
310 /* Keep wakeup interrupts disabled until suspend */
311 irq_set_status_flags(irq, IRQ_NOAUTOEN);
312 ret = devm_request_threaded_irq(qcom->dev, irq, NULL,
313 qcom_dwc3_resume_irq,
314 IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
315 "qcom_dwc3 HS", qcom);
316 if (ret) {
317 dev_err(qcom->dev, "hs_phy_irq failed: %d\n", ret);
318 return ret;
319 }
320 qcom->hs_phy_irq = irq;
321 }
322
323 irq = platform_get_irq_byname(pdev, "dp_hs_phy_irq");
324 if (irq > 0) {
325 irq_set_status_flags(irq, IRQ_NOAUTOEN);
326 ret = devm_request_threaded_irq(qcom->dev, irq, NULL,
327 qcom_dwc3_resume_irq,
328 IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
329 "qcom_dwc3 DP_HS", qcom);
330 if (ret) {
331 dev_err(qcom->dev, "dp_hs_phy_irq failed: %d\n", ret);
332 return ret;
333 }
334 qcom->dp_hs_phy_irq = irq;
335 }
336
337 irq = platform_get_irq_byname(pdev, "dm_hs_phy_irq");
338 if (irq > 0) {
339 irq_set_status_flags(irq, IRQ_NOAUTOEN);
340 ret = devm_request_threaded_irq(qcom->dev, irq, NULL,
341 qcom_dwc3_resume_irq,
342 IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
343 "qcom_dwc3 DM_HS", qcom);
344 if (ret) {
345 dev_err(qcom->dev, "dm_hs_phy_irq failed: %d\n", ret);
346 return ret;
347 }
348 qcom->dm_hs_phy_irq = irq;
349 }
350
351 irq = platform_get_irq_byname(pdev, "ss_phy_irq");
352 if (irq > 0) {
353 irq_set_status_flags(irq, IRQ_NOAUTOEN);
354 ret = devm_request_threaded_irq(qcom->dev, irq, NULL,
355 qcom_dwc3_resume_irq,
356 IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
357 "qcom_dwc3 SS", qcom);
358 if (ret) {
359 dev_err(qcom->dev, "ss_phy_irq failed: %d\n", ret);
360 return ret;
361 }
362 qcom->ss_phy_irq = irq;
363 }
364
365 return 0;
366 }
367
368 static int dwc3_qcom_clk_init(struct dwc3_qcom *qcom, int count)
369 {
370 struct device *dev = qcom->dev;
371 struct device_node *np = dev->of_node;
372 int i;
373
374 qcom->num_clocks = count;
375
376 if (!count)
377 return 0;
378
379 qcom->clks = devm_kcalloc(dev, qcom->num_clocks,
380 sizeof(struct clk *), GFP_KERNEL);
381 if (!qcom->clks)
382 return -ENOMEM;
383
384 for (i = 0; i < qcom->num_clocks; i++) {
385 struct clk *clk;
386 int ret;
387
388 clk = of_clk_get(np, i);
389 if (IS_ERR(clk)) {
390 while (--i >= 0)
391 clk_put(qcom->clks[i]);
392 return PTR_ERR(clk);
393 }
394
395 ret = clk_prepare_enable(clk);
396 if (ret < 0) {
397 while (--i >= 0) {
398 clk_disable_unprepare(qcom->clks[i]);
399 clk_put(qcom->clks[i]);
400 }
401 clk_put(clk);
402
403 return ret;
404 }
405
406 qcom->clks[i] = clk;
407 }
408
409 return 0;
410 }
411
412 static int dwc3_qcom_probe(struct platform_device *pdev)
413 {
414 struct device_node *np = pdev->dev.of_node, *dwc3_np;
415 struct device *dev = &pdev->dev;
416 struct dwc3_qcom *qcom;
417 struct resource *res;
418 int ret, i;
419 bool ignore_pipe_clk;
420
421 qcom = devm_kzalloc(&pdev->dev, sizeof(*qcom), GFP_KERNEL);
422 if (!qcom)
423 return -ENOMEM;
424
425 platform_set_drvdata(pdev, qcom);
426 qcom->dev = &pdev->dev;
427
428 qcom->resets = devm_reset_control_array_get_optional_exclusive(dev);
429 if (IS_ERR(qcom->resets)) {
430 ret = PTR_ERR(qcom->resets);
431 dev_err(&pdev->dev, "failed to get resets, err=%d\n", ret);
432 return ret;
433 }
434
435 ret = reset_control_assert(qcom->resets);
436 if (ret) {
437 dev_err(&pdev->dev, "failed to assert resets, err=%d\n", ret);
438 return ret;
439 }
440
441 usleep_range(10, 1000);
442
443 ret = reset_control_deassert(qcom->resets);
444 if (ret) {
445 dev_err(&pdev->dev, "failed to deassert resets, err=%d\n", ret);
446 goto reset_assert;
447 }
448
449 ret = dwc3_qcom_clk_init(qcom, of_count_phandle_with_args(np,
450 "clocks", "#clock-cells"));
451 if (ret) {
452 dev_err(dev, "failed to get clocks\n");
453 goto reset_assert;
454 }
455
456 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
457 qcom->qscratch_base = devm_ioremap_resource(dev, res);
458 if (IS_ERR(qcom->qscratch_base)) {
459 dev_err(dev, "failed to map qscratch, err=%d\n", ret);
460 ret = PTR_ERR(qcom->qscratch_base);
461 goto clk_disable;
462 }
463
464 ret = dwc3_qcom_setup_irq(pdev);
465 if (ret)
466 goto clk_disable;
467
468 dwc3_np = of_get_child_by_name(np, "dwc3");
469 if (!dwc3_np) {
470 dev_err(dev, "failed to find dwc3 core child\n");
471 ret = -ENODEV;
472 goto clk_disable;
473 }
474
475 /*
476 * Disable pipe_clk requirement if specified. Used when dwc3
477 * operates without SSPHY and only HS/FS/LS modes are supported.
478 */
479 ignore_pipe_clk = device_property_read_bool(dev,
480 "qcom,select-utmi-as-pipe-clk");
481 if (ignore_pipe_clk)
482 dwc3_qcom_select_utmi_clk(qcom);
483
484 ret = of_platform_populate(np, NULL, NULL, dev);
485 if (ret) {
486 dev_err(dev, "failed to register dwc3 core - %d\n", ret);
487 goto clk_disable;
488 }
489
490 qcom->dwc3 = of_find_device_by_node(dwc3_np);
491 if (!qcom->dwc3) {
492 dev_err(&pdev->dev, "failed to get dwc3 platform device\n");
493 ret = -ENODEV;
494 goto depopulate;
495 }
496
497 qcom->mode = usb_get_dr_mode(&qcom->dwc3->dev);
498
499 /* enable vbus override for device mode */
500 if (qcom->mode == USB_DR_MODE_PERIPHERAL)
501 dwc3_qcom_vbus_overrride_enable(qcom, true);
502
503 /* register extcon to override sw_vbus on Vbus change later */
504 ret = dwc3_qcom_register_extcon(qcom);
505 if (ret)
506 goto depopulate;
507
508 device_init_wakeup(&pdev->dev, 1);
509 qcom->is_suspended = false;
510 pm_runtime_set_active(dev);
511 pm_runtime_enable(dev);
512 pm_runtime_forbid(dev);
513
514 return 0;
515
516 depopulate:
517 of_platform_depopulate(&pdev->dev);
518 clk_disable:
519 for (i = qcom->num_clocks - 1; i >= 0; i--) {
520 clk_disable_unprepare(qcom->clks[i]);
521 clk_put(qcom->clks[i]);
522 }
523 reset_assert:
524 reset_control_assert(qcom->resets);
525
526 return ret;
527 }
528
529 static int dwc3_qcom_remove(struct platform_device *pdev)
530 {
531 struct dwc3_qcom *qcom = platform_get_drvdata(pdev);
532 struct device *dev = &pdev->dev;
533 int i;
534
535 of_platform_depopulate(dev);
536
537 for (i = qcom->num_clocks - 1; i >= 0; i--) {
538 clk_disable_unprepare(qcom->clks[i]);
539 clk_put(qcom->clks[i]);
540 }
541 qcom->num_clocks = 0;
542
543 reset_control_assert(qcom->resets);
544
545 pm_runtime_allow(dev);
546 pm_runtime_disable(dev);
547
548 return 0;
549 }
550
551 static int __maybe_unused dwc3_qcom_pm_suspend(struct device *dev)
552 {
553 struct dwc3_qcom *qcom = dev_get_drvdata(dev);
554 int ret = 0;
555
556 ret = dwc3_qcom_suspend(qcom);
557 if (!ret)
558 qcom->pm_suspended = true;
559
560 return ret;
561 }
562
563 static int __maybe_unused dwc3_qcom_pm_resume(struct device *dev)
564 {
565 struct dwc3_qcom *qcom = dev_get_drvdata(dev);
566 int ret;
567
568 ret = dwc3_qcom_resume(qcom);
569 if (!ret)
570 qcom->pm_suspended = false;
571
572 return ret;
573 }
574
575 static int __maybe_unused dwc3_qcom_runtime_suspend(struct device *dev)
576 {
577 struct dwc3_qcom *qcom = dev_get_drvdata(dev);
578
579 return dwc3_qcom_suspend(qcom);
580 }
581
582 static int __maybe_unused dwc3_qcom_runtime_resume(struct device *dev)
583 {
584 struct dwc3_qcom *qcom = dev_get_drvdata(dev);
585
586 return dwc3_qcom_resume(qcom);
587 }
588
589 static const struct dev_pm_ops dwc3_qcom_dev_pm_ops = {
590 SET_SYSTEM_SLEEP_PM_OPS(dwc3_qcom_pm_suspend, dwc3_qcom_pm_resume)
591 SET_RUNTIME_PM_OPS(dwc3_qcom_runtime_suspend, dwc3_qcom_runtime_resume,
592 NULL)
593 };
594
595 static const struct of_device_id dwc3_qcom_of_match[] = {
596 { .compatible = "qcom,dwc3" },
597 { .compatible = "qcom,msm8996-dwc3" },
598 { .compatible = "qcom,sdm845-dwc3" },
599 { }
600 };
601 MODULE_DEVICE_TABLE(of, dwc3_qcom_of_match);
602
603 static struct platform_driver dwc3_qcom_driver = {
604 .probe = dwc3_qcom_probe,
605 .remove = dwc3_qcom_remove,
606 .driver = {
607 .name = "dwc3-qcom",
608 .pm = &dwc3_qcom_dev_pm_ops,
609 .of_match_table = dwc3_qcom_of_match,
610 },
611 };
612
613 module_platform_driver(dwc3_qcom_driver);
614
615 MODULE_LICENSE("GPL v2");
616 MODULE_DESCRIPTION("DesignWare DWC3 QCOM Glue Driver");
Linux with added FPC-III support