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Merge tag 'pci-v6.16-fixes-3' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci
[linux-2.6-block.git] / drivers / usb / renesas_usbhs / common.c
... / ...
CommitLineData
1// SPDX-License-Identifier: GPL-1.0+
2/*
3 * Renesas USB driver
4 *
5 * Copyright (C) 2011 Renesas Solutions Corp.
6 * Copyright (C) 2019 Renesas Electronics Corporation
7 * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
8 */
9#include <linux/clk.h>
10#include <linux/err.h>
11#include <linux/gpio/consumer.h>
12#include <linux/io.h>
13#include <linux/module.h>
14#include <linux/of.h>
15#include <linux/pm_runtime.h>
16#include <linux/reset.h>
17#include <linux/slab.h>
18#include <linux/sysfs.h>
19#include "common.h"
20#include "rcar2.h"
21#include "rcar3.h"
22#include "rza.h"
23
24/*
25 * image of renesas_usbhs
26 *
27 * ex) gadget case
28
29 * mod.c
30 * mod_gadget.c
31 * mod_host.c pipe.c fifo.c
32 *
33 * +-------+ +-----------+
34 * | pipe0 |------>| fifo pio |
35 * +------------+ +-------+ +-----------+
36 * | mod_gadget |=====> | pipe1 |--+
37 * +------------+ +-------+ | +-----------+
38 * | pipe2 | | +-| fifo dma0 |
39 * +------------+ +-------+ | | +-----------+
40 * | mod_host | | pipe3 |<-|--+
41 * +------------+ +-------+ | +-----------+
42 * | .... | +--->| fifo dma1 |
43 * | .... | +-----------+
44 */
45
46/*
47 * platform call back
48 *
49 * renesas usb support platform callback function.
50 * Below macro call it.
51 * if platform doesn't have callback, it return 0 (no error)
52 */
53#define usbhs_platform_call(priv, func, args...)\
54 (!(priv) ? -ENODEV : \
55 !((priv)->pfunc->func) ? 0 : \
56 (priv)->pfunc->func(args))
57
58/*
59 * common functions
60 */
61u16 usbhs_read(struct usbhs_priv *priv, u32 reg)
62{
63 return ioread16(priv->base + reg);
64}
65
66void usbhs_write(struct usbhs_priv *priv, u32 reg, u16 data)
67{
68 iowrite16(data, priv->base + reg);
69}
70
71void usbhs_bset(struct usbhs_priv *priv, u32 reg, u16 mask, u16 data)
72{
73 u16 val = usbhs_read(priv, reg);
74
75 val &= ~mask;
76 val |= data & mask;
77
78 usbhs_write(priv, reg, val);
79}
80
81struct usbhs_priv *usbhs_pdev_to_priv(struct platform_device *pdev)
82{
83 return dev_get_drvdata(&pdev->dev);
84}
85
86int usbhs_get_id_as_gadget(struct platform_device *pdev)
87{
88 return USBHS_GADGET;
89}
90
91/*
92 * syscfg functions
93 */
94static void usbhs_sys_clock_ctrl(struct usbhs_priv *priv, int enable)
95{
96 usbhs_bset(priv, SYSCFG, SCKE, enable ? SCKE : 0);
97}
98
99void usbhs_sys_host_ctrl(struct usbhs_priv *priv, int enable)
100{
101 u16 mask = DCFM | DRPD | DPRPU | HSE | USBE;
102 u16 val = DCFM | DRPD | HSE | USBE;
103
104 /*
105 * if enable
106 *
107 * - select Host mode
108 * - D+ Line/D- Line Pull-down
109 */
110 usbhs_bset(priv, SYSCFG, mask, enable ? val : 0);
111}
112
113void usbhs_sys_function_ctrl(struct usbhs_priv *priv, int enable)
114{
115 u16 mask = DCFM | DRPD | DPRPU | HSE | USBE;
116 u16 val = HSE | USBE;
117
118 /* CNEN bit is required for function operation */
119 if (usbhs_get_dparam(priv, has_cnen)) {
120 mask |= CNEN;
121 val |= CNEN;
122 }
123
124 /*
125 * if enable
126 *
127 * - select Function mode
128 * - D+ Line Pull-up is disabled
129 * When D+ Line Pull-up is enabled,
130 * calling usbhs_sys_function_pullup(,1)
131 */
132 usbhs_bset(priv, SYSCFG, mask, enable ? val : 0);
133}
134
135void usbhs_sys_function_pullup(struct usbhs_priv *priv, int enable)
136{
137 usbhs_bset(priv, SYSCFG, DPRPU, enable ? DPRPU : 0);
138}
139
140void usbhs_sys_set_test_mode(struct usbhs_priv *priv, u16 mode)
141{
142 usbhs_write(priv, TESTMODE, mode);
143}
144
145/*
146 * frame functions
147 */
148int usbhs_frame_get_num(struct usbhs_priv *priv)
149{
150 return usbhs_read(priv, FRMNUM) & FRNM_MASK;
151}
152
153/*
154 * usb request functions
155 */
156void usbhs_usbreq_get_val(struct usbhs_priv *priv, struct usb_ctrlrequest *req)
157{
158 u16 val;
159
160 val = usbhs_read(priv, USBREQ);
161 req->bRequest = (val >> 8) & 0xFF;
162 req->bRequestType = (val >> 0) & 0xFF;
163
164 req->wValue = cpu_to_le16(usbhs_read(priv, USBVAL));
165 req->wIndex = cpu_to_le16(usbhs_read(priv, USBINDX));
166 req->wLength = cpu_to_le16(usbhs_read(priv, USBLENG));
167}
168
169void usbhs_usbreq_set_val(struct usbhs_priv *priv, struct usb_ctrlrequest *req)
170{
171 usbhs_write(priv, USBREQ, (req->bRequest << 8) | req->bRequestType);
172 usbhs_write(priv, USBVAL, le16_to_cpu(req->wValue));
173 usbhs_write(priv, USBINDX, le16_to_cpu(req->wIndex));
174 usbhs_write(priv, USBLENG, le16_to_cpu(req->wLength));
175
176 usbhs_bset(priv, DCPCTR, SUREQ, SUREQ);
177}
178
179/*
180 * bus/vbus functions
181 */
182void usbhs_bus_send_sof_enable(struct usbhs_priv *priv)
183{
184 u16 status = usbhs_read(priv, DVSTCTR) & (USBRST | UACT);
185
186 if (status != USBRST) {
187 struct device *dev = usbhs_priv_to_dev(priv);
188 dev_err(dev, "usbhs should be reset\n");
189 }
190
191 usbhs_bset(priv, DVSTCTR, (USBRST | UACT), UACT);
192}
193
194void usbhs_bus_send_reset(struct usbhs_priv *priv)
195{
196 usbhs_bset(priv, DVSTCTR, (USBRST | UACT), USBRST);
197}
198
199int usbhs_bus_get_speed(struct usbhs_priv *priv)
200{
201 u16 dvstctr = usbhs_read(priv, DVSTCTR);
202
203 switch (RHST & dvstctr) {
204 case RHST_LOW_SPEED:
205 return USB_SPEED_LOW;
206 case RHST_FULL_SPEED:
207 return USB_SPEED_FULL;
208 case RHST_HIGH_SPEED:
209 return USB_SPEED_HIGH;
210 }
211
212 return USB_SPEED_UNKNOWN;
213}
214
215int usbhs_vbus_ctrl(struct usbhs_priv *priv, int enable)
216{
217 struct platform_device *pdev = usbhs_priv_to_pdev(priv);
218
219 return usbhs_platform_call(priv, set_vbus, pdev, enable);
220}
221
222static void usbhsc_bus_init(struct usbhs_priv *priv)
223{
224 usbhs_write(priv, DVSTCTR, 0);
225
226 usbhs_vbus_ctrl(priv, 0);
227}
228
229/*
230 * device configuration
231 */
232int usbhs_set_device_config(struct usbhs_priv *priv, int devnum,
233 u16 upphub, u16 hubport, u16 speed)
234{
235 struct device *dev = usbhs_priv_to_dev(priv);
236 u16 usbspd = 0;
237 u32 reg = DEVADD0 + (2 * devnum);
238
239 if (devnum > 10) {
240 dev_err(dev, "cannot set speed to unknown device %d\n", devnum);
241 return -EIO;
242 }
243
244 if (upphub > 0xA) {
245 dev_err(dev, "unsupported hub number %d\n", upphub);
246 return -EIO;
247 }
248
249 switch (speed) {
250 case USB_SPEED_LOW:
251 usbspd = USBSPD_SPEED_LOW;
252 break;
253 case USB_SPEED_FULL:
254 usbspd = USBSPD_SPEED_FULL;
255 break;
256 case USB_SPEED_HIGH:
257 usbspd = USBSPD_SPEED_HIGH;
258 break;
259 default:
260 dev_err(dev, "unsupported speed %d\n", speed);
261 return -EIO;
262 }
263
264 usbhs_write(priv, reg, UPPHUB(upphub) |
265 HUBPORT(hubport)|
266 USBSPD(usbspd));
267
268 return 0;
269}
270
271/*
272 * interrupt functions
273 */
274void usbhs_xxxsts_clear(struct usbhs_priv *priv, u16 sts_reg, u16 bit)
275{
276 u16 pipe_mask = (u16)GENMASK(usbhs_get_dparam(priv, pipe_size), 0);
277
278 usbhs_write(priv, sts_reg, ~(1 << bit) & pipe_mask);
279}
280
281/*
282 * local functions
283 */
284static void usbhsc_set_buswait(struct usbhs_priv *priv)
285{
286 int wait = usbhs_get_dparam(priv, buswait_bwait);
287
288 /* set bus wait if platform have */
289 if (wait)
290 usbhs_bset(priv, BUSWAIT, 0x000F, wait);
291}
292
293static bool usbhsc_is_multi_clks(struct usbhs_priv *priv)
294{
295 return priv->dparam.multi_clks;
296}
297
298static int usbhsc_clk_get(struct device *dev, struct usbhs_priv *priv)
299{
300 if (!usbhsc_is_multi_clks(priv))
301 return 0;
302
303 /* The first clock should exist */
304 priv->clks[0] = of_clk_get(dev_of_node(dev), 0);
305 if (IS_ERR(priv->clks[0]))
306 return PTR_ERR(priv->clks[0]);
307
308 /*
309 * To backward compatibility with old DT, this driver checks the return
310 * value if it's -ENOENT or not.
311 */
312 priv->clks[1] = of_clk_get(dev_of_node(dev), 1);
313 if (PTR_ERR(priv->clks[1]) == -ENOENT)
314 priv->clks[1] = NULL;
315 else if (IS_ERR(priv->clks[1])) {
316 clk_put(priv->clks[0]);
317 return PTR_ERR(priv->clks[1]);
318 }
319
320 return 0;
321}
322
323static void usbhsc_clk_put(struct usbhs_priv *priv)
324{
325 int i;
326
327 if (!usbhsc_is_multi_clks(priv))
328 return;
329
330 for (i = 0; i < ARRAY_SIZE(priv->clks); i++)
331 clk_put(priv->clks[i]);
332}
333
334static int usbhsc_clk_prepare_enable(struct usbhs_priv *priv)
335{
336 int i, ret;
337
338 if (!usbhsc_is_multi_clks(priv))
339 return 0;
340
341 for (i = 0; i < ARRAY_SIZE(priv->clks); i++) {
342 ret = clk_prepare_enable(priv->clks[i]);
343 if (ret) {
344 while (--i >= 0)
345 clk_disable_unprepare(priv->clks[i]);
346 return ret;
347 }
348 }
349
350 return ret;
351}
352
353static void usbhsc_clk_disable_unprepare(struct usbhs_priv *priv)
354{
355 int i;
356
357 if (!usbhsc_is_multi_clks(priv))
358 return;
359
360 for (i = 0; i < ARRAY_SIZE(priv->clks); i++)
361 clk_disable_unprepare(priv->clks[i]);
362}
363
364/*
365 * platform default param
366 */
367
368/* commonly used on old SH-Mobile and RZ/G2L family SoCs */
369static struct renesas_usbhs_driver_pipe_config usbhsc_default_pipe[] = {
370 RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_CONTROL, 64, 0x00, false),
371 RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_ISOC, 1024, 0x08, true),
372 RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_ISOC, 1024, 0x28, true),
373 RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_BULK, 512, 0x48, true),
374 RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_BULK, 512, 0x58, true),
375 RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_BULK, 512, 0x68, true),
376 RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_INT, 64, 0x04, false),
377 RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_INT, 64, 0x05, false),
378 RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_INT, 64, 0x06, false),
379 RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_INT, 64, 0x07, false),
380};
381
382/* commonly used on newer SH-Mobile and R-Car SoCs */
383static struct renesas_usbhs_driver_pipe_config usbhsc_new_pipe[] = {
384 RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_CONTROL, 64, 0x00, false),
385 RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_ISOC, 1024, 0x08, true),
386 RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_ISOC, 1024, 0x28, true),
387 RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_BULK, 512, 0x48, true),
388 RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_BULK, 512, 0x58, true),
389 RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_BULK, 512, 0x68, true),
390 RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_INT, 64, 0x04, false),
391 RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_INT, 64, 0x05, false),
392 RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_INT, 64, 0x06, false),
393 RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_BULK, 512, 0x78, true),
394 RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_BULK, 512, 0x88, true),
395 RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_BULK, 512, 0x98, true),
396 RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_BULK, 512, 0xa8, true),
397 RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_BULK, 512, 0xb8, true),
398 RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_BULK, 512, 0xc8, true),
399 RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_BULK, 512, 0xd8, true),
400};
401
402/*
403 * power control
404 */
405static void usbhsc_power_ctrl(struct usbhs_priv *priv, int enable)
406{
407 struct platform_device *pdev = usbhs_priv_to_pdev(priv);
408 struct device *dev = usbhs_priv_to_dev(priv);
409
410 if (enable) {
411 /* enable PM */
412 pm_runtime_get_sync(dev);
413
414 /* enable clks */
415 if (usbhsc_clk_prepare_enable(priv))
416 return;
417
418 /* enable platform power */
419 usbhs_platform_call(priv, power_ctrl, pdev, priv->base, enable);
420
421 /* USB on */
422 usbhs_sys_clock_ctrl(priv, enable);
423 } else {
424 /* USB off */
425 usbhs_sys_clock_ctrl(priv, enable);
426
427 /* disable platform power */
428 usbhs_platform_call(priv, power_ctrl, pdev, priv->base, enable);
429
430 /* disable clks */
431 usbhsc_clk_disable_unprepare(priv);
432
433 /* disable PM */
434 pm_runtime_put_sync(dev);
435 }
436}
437
438/*
439 * hotplug
440 */
441static void usbhsc_hotplug(struct usbhs_priv *priv)
442{
443 struct platform_device *pdev = usbhs_priv_to_pdev(priv);
444 struct usbhs_mod *mod = usbhs_mod_get_current(priv);
445 int id;
446 int enable;
447 int cable;
448 int ret;
449
450 /*
451 * get vbus status from platform
452 */
453 enable = usbhs_mod_info_call(priv, get_vbus, pdev);
454
455 /*
456 * get id from platform
457 */
458 id = usbhs_platform_call(priv, get_id, pdev);
459
460 if (enable && !mod) {
461 if (priv->edev) {
462 cable = extcon_get_state(priv->edev, EXTCON_USB_HOST);
463 if ((cable > 0 && id != USBHS_HOST) ||
464 (!cable && id != USBHS_GADGET)) {
465 dev_info(&pdev->dev,
466 "USB cable plugged in doesn't match the selected role!\n");
467 return;
468 }
469 }
470
471 ret = usbhs_mod_change(priv, id);
472 if (ret < 0)
473 return;
474
475 dev_dbg(&pdev->dev, "%s enable\n", __func__);
476
477 /* power on */
478 if (usbhs_get_dparam(priv, runtime_pwctrl))
479 usbhsc_power_ctrl(priv, enable);
480
481 /* bus init */
482 usbhsc_set_buswait(priv);
483 usbhsc_bus_init(priv);
484
485 /* module start */
486 usbhs_mod_call(priv, start, priv);
487
488 } else if (!enable && mod) {
489 dev_dbg(&pdev->dev, "%s disable\n", __func__);
490
491 /* module stop */
492 usbhs_mod_call(priv, stop, priv);
493
494 /* bus init */
495 usbhsc_bus_init(priv);
496
497 /* power off */
498 if (usbhs_get_dparam(priv, runtime_pwctrl))
499 usbhsc_power_ctrl(priv, enable);
500
501 usbhs_mod_change(priv, -1);
502
503 /* reset phy for next connection */
504 usbhs_platform_call(priv, phy_reset, pdev);
505 }
506}
507
508/*
509 * notify hotplug
510 */
511static void usbhsc_notify_hotplug(struct work_struct *work)
512{
513 struct usbhs_priv *priv = container_of(work,
514 struct usbhs_priv,
515 notify_hotplug_work.work);
516 usbhsc_hotplug(priv);
517}
518
519int usbhsc_schedule_notify_hotplug(struct platform_device *pdev)
520{
521 struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
522 int delay = usbhs_get_dparam(priv, detection_delay);
523
524 /*
525 * This functions will be called in interrupt.
526 * To make sure safety context,
527 * use workqueue for usbhs_notify_hotplug
528 */
529 schedule_delayed_work(&priv->notify_hotplug_work,
530 msecs_to_jiffies(delay));
531 return 0;
532}
533
534/*
535 * platform functions
536 */
537static const struct of_device_id usbhs_of_match[] = {
538 {
539 .compatible = "renesas,usbhs-r8a774c0",
540 .data = &usbhs_rcar_gen3_with_pll_plat_info,
541 },
542 {
543 .compatible = "renesas,usbhs-r8a7790",
544 .data = &usbhs_rcar_gen2_plat_info,
545 },
546 {
547 .compatible = "renesas,usbhs-r8a7791",
548 .data = &usbhs_rcar_gen2_plat_info,
549 },
550 {
551 .compatible = "renesas,usbhs-r8a7794",
552 .data = &usbhs_rcar_gen2_plat_info,
553 },
554 {
555 .compatible = "renesas,usbhs-r8a7795",
556 .data = &usbhs_rcar_gen3_plat_info,
557 },
558 {
559 .compatible = "renesas,usbhs-r8a7796",
560 .data = &usbhs_rcar_gen3_plat_info,
561 },
562 {
563 .compatible = "renesas,usbhs-r8a77990",
564 .data = &usbhs_rcar_gen3_with_pll_plat_info,
565 },
566 {
567 .compatible = "renesas,usbhs-r8a77995",
568 .data = &usbhs_rcar_gen3_with_pll_plat_info,
569 },
570 {
571 .compatible = "renesas,usbhs-r9a07g043",
572 .data = &usbhs_rzg2l_plat_info,
573 },
574 {
575 .compatible = "renesas,usbhs-r9a07g044",
576 .data = &usbhs_rzg2l_plat_info,
577 },
578 {
579 .compatible = "renesas,usbhs-r9a07g054",
580 .data = &usbhs_rzg2l_plat_info,
581 },
582 {
583 .compatible = "renesas,rcar-gen2-usbhs",
584 .data = &usbhs_rcar_gen2_plat_info,
585 },
586 {
587 .compatible = "renesas,rcar-gen3-usbhs",
588 .data = &usbhs_rcar_gen3_plat_info,
589 },
590 {
591 .compatible = "renesas,rza1-usbhs",
592 .data = &usbhs_rza1_plat_info,
593 },
594 {
595 .compatible = "renesas,rza2-usbhs",
596 .data = &usbhs_rza2_plat_info,
597 },
598 {
599 .compatible = "renesas,rzg2l-usbhs",
600 .data = &usbhs_rzg2l_plat_info,
601 },
602 { }
603};
604MODULE_DEVICE_TABLE(of, usbhs_of_match);
605
606static int usbhs_probe(struct platform_device *pdev)
607{
608 const struct renesas_usbhs_platform_info *info;
609 struct usbhs_priv *priv;
610 struct device *dev = &pdev->dev;
611 struct gpio_desc *gpiod;
612 int ret;
613 u32 tmp;
614 int irq;
615
616 info = of_device_get_match_data(dev);
617 if (!info) {
618 info = dev_get_platdata(dev);
619 if (!info)
620 return dev_err_probe(dev, -EINVAL, "no platform info\n");
621 }
622
623 /* platform data */
624 irq = platform_get_irq(pdev, 0);
625 if (irq < 0)
626 return irq;
627
628 /* usb private data */
629 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
630 if (!priv)
631 return -ENOMEM;
632
633 priv->base = devm_platform_ioremap_resource(pdev, 0);
634 if (IS_ERR(priv->base))
635 return PTR_ERR(priv->base);
636
637 if (of_property_present(dev_of_node(dev), "extcon")) {
638 priv->edev = extcon_get_edev_by_phandle(dev, 0);
639 if (IS_ERR(priv->edev))
640 return PTR_ERR(priv->edev);
641 }
642
643 priv->rsts = devm_reset_control_array_get_optional_shared(dev);
644 if (IS_ERR(priv->rsts))
645 return PTR_ERR(priv->rsts);
646
647 /*
648 * care platform info
649 */
650
651 priv->dparam = info->driver_param;
652
653 if (!info->platform_callback.get_id) {
654 dev_err(dev, "no platform callbacks\n");
655 return -EINVAL;
656 }
657 priv->pfunc = &info->platform_callback;
658
659 /* set default param if platform doesn't have */
660 if (usbhs_get_dparam(priv, has_new_pipe_configs)) {
661 priv->dparam.pipe_configs = usbhsc_new_pipe;
662 priv->dparam.pipe_size = ARRAY_SIZE(usbhsc_new_pipe);
663 } else if (!priv->dparam.pipe_configs) {
664 priv->dparam.pipe_configs = usbhsc_default_pipe;
665 priv->dparam.pipe_size = ARRAY_SIZE(usbhsc_default_pipe);
666 }
667 if (!priv->dparam.pio_dma_border)
668 priv->dparam.pio_dma_border = 64; /* 64byte */
669 if (!of_property_read_u32(dev_of_node(dev), "renesas,buswait", &tmp))
670 priv->dparam.buswait_bwait = tmp;
671 gpiod = devm_gpiod_get_optional(dev, "renesas,enable", GPIOD_IN);
672 if (IS_ERR(gpiod))
673 return PTR_ERR(gpiod);
674
675 /* FIXME */
676 /* runtime power control ? */
677 if (priv->pfunc->get_vbus)
678 usbhs_get_dparam(priv, runtime_pwctrl) = 1;
679
680 /*
681 * priv settings
682 */
683 priv->irq = irq;
684 priv->pdev = pdev;
685 INIT_DELAYED_WORK(&priv->notify_hotplug_work, usbhsc_notify_hotplug);
686 spin_lock_init(usbhs_priv_to_lock(priv));
687
688 /*
689 * Acquire clocks and enable power management (PM) early in the
690 * probe process, as the driver accesses registers during
691 * initialization. Ensure the device is active before proceeding.
692 */
693 pm_runtime_enable(dev);
694
695 ret = usbhsc_clk_get(dev, priv);
696 if (ret)
697 goto probe_pm_disable;
698
699 ret = pm_runtime_resume_and_get(dev);
700 if (ret)
701 goto probe_clk_put;
702
703 ret = usbhsc_clk_prepare_enable(priv);
704 if (ret)
705 goto probe_pm_put;
706
707 /* call pipe and module init */
708 ret = usbhs_pipe_probe(priv);
709 if (ret < 0)
710 goto probe_clk_dis_unprepare;
711
712 ret = usbhs_fifo_probe(priv);
713 if (ret < 0)
714 goto probe_end_pipe_exit;
715
716 ret = usbhs_mod_probe(priv);
717 if (ret < 0)
718 goto probe_end_fifo_exit;
719
720 /* platform_set_drvdata() should be called after usbhs_mod_probe() */
721 platform_set_drvdata(pdev, priv);
722
723 ret = reset_control_deassert(priv->rsts);
724 if (ret)
725 goto probe_fail_rst;
726
727 /*
728 * device reset here because
729 * USB device might be used in boot loader.
730 */
731 usbhs_sys_clock_ctrl(priv, 0);
732
733 /* check GPIO determining if USB function should be enabled */
734 if (gpiod) {
735 ret = !gpiod_get_value(gpiod);
736 if (ret) {
737 dev_warn(dev, "USB function not selected (GPIO)\n");
738 ret = -ENOTSUPP;
739 goto probe_assert_rest;
740 }
741 }
742
743 /*
744 * platform call
745 *
746 * USB phy setup might depend on CPU/Board.
747 * If platform has its callback functions,
748 * call it here.
749 */
750 ret = usbhs_platform_call(priv, hardware_init, pdev);
751 if (ret < 0) {
752 dev_err(dev, "platform init failed.\n");
753 goto probe_assert_rest;
754 }
755
756 /* reset phy for connection */
757 usbhs_platform_call(priv, phy_reset, pdev);
758
759 /*
760 * Disable the clocks that were enabled earlier in the probe path,
761 * and let the driver handle the clocks beyond this point.
762 */
763 usbhsc_clk_disable_unprepare(priv);
764 pm_runtime_put(dev);
765
766 if (!usbhs_get_dparam(priv, runtime_pwctrl)) {
767 usbhsc_power_ctrl(priv, 1);
768 usbhs_mod_autonomy_mode(priv);
769 } else {
770 usbhs_mod_non_autonomy_mode(priv);
771 }
772
773 /*
774 * manual call notify_hotplug for cold plug
775 */
776 usbhsc_schedule_notify_hotplug(pdev);
777
778 dev_info(dev, "probed\n");
779
780 return ret;
781
782probe_assert_rest:
783 reset_control_assert(priv->rsts);
784probe_fail_rst:
785 usbhs_mod_remove(priv);
786probe_end_fifo_exit:
787 usbhs_fifo_remove(priv);
788probe_end_pipe_exit:
789 usbhs_pipe_remove(priv);
790probe_clk_dis_unprepare:
791 usbhsc_clk_disable_unprepare(priv);
792probe_pm_put:
793 pm_runtime_put(dev);
794probe_clk_put:
795 usbhsc_clk_put(priv);
796probe_pm_disable:
797 pm_runtime_disable(dev);
798
799 dev_info(dev, "probe failed (%d)\n", ret);
800
801 return ret;
802}
803
804static void usbhs_remove(struct platform_device *pdev)
805{
806 struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
807
808 dev_dbg(&pdev->dev, "usb remove\n");
809
810 flush_delayed_work(&priv->notify_hotplug_work);
811
812 /* power off */
813 if (!usbhs_get_dparam(priv, runtime_pwctrl))
814 usbhsc_power_ctrl(priv, 0);
815
816 pm_runtime_disable(&pdev->dev);
817
818 usbhs_platform_call(priv, hardware_exit, pdev);
819 usbhsc_clk_put(priv);
820 reset_control_assert(priv->rsts);
821 usbhs_mod_remove(priv);
822 usbhs_fifo_remove(priv);
823 usbhs_pipe_remove(priv);
824}
825
826static __maybe_unused int usbhsc_suspend(struct device *dev)
827{
828 struct usbhs_priv *priv = dev_get_drvdata(dev);
829 struct usbhs_mod *mod = usbhs_mod_get_current(priv);
830
831 if (mod) {
832 usbhs_mod_call(priv, stop, priv);
833 usbhs_mod_change(priv, -1);
834 }
835
836 if (mod || !usbhs_get_dparam(priv, runtime_pwctrl))
837 usbhsc_power_ctrl(priv, 0);
838
839 return 0;
840}
841
842static __maybe_unused int usbhsc_resume(struct device *dev)
843{
844 struct usbhs_priv *priv = dev_get_drvdata(dev);
845 struct platform_device *pdev = usbhs_priv_to_pdev(priv);
846
847 if (!usbhs_get_dparam(priv, runtime_pwctrl)) {
848 usbhsc_power_ctrl(priv, 1);
849 usbhs_mod_autonomy_mode(priv);
850 }
851
852 usbhs_platform_call(priv, phy_reset, pdev);
853
854 usbhsc_schedule_notify_hotplug(pdev);
855
856 return 0;
857}
858
859static SIMPLE_DEV_PM_OPS(usbhsc_pm_ops, usbhsc_suspend, usbhsc_resume);
860
861static struct platform_driver renesas_usbhs_driver = {
862 .driver = {
863 .name = "renesas_usbhs",
864 .pm = &usbhsc_pm_ops,
865 .of_match_table = usbhs_of_match,
866 },
867 .probe = usbhs_probe,
868 .remove = usbhs_remove,
869};
870
871module_platform_driver(renesas_usbhs_driver);
872
873MODULE_LICENSE("GPL");
874MODULE_DESCRIPTION("Renesas USB driver");
875MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
Linux 6.x block layer and io_uring tree(s)