summaryrefslogtreecommitdiff
path: root/drivers/usb/musb/mediatek.c
blob: a627f4133d6ba9fc45f06c272f217bbd09e1846d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2019 MediaTek Inc.
 *
 * Author:
 *  Min Guo <min.guo@mediatek.com>
 *  Yonglong Wu <yonglong.wu@mediatek.com>
 */

#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/usb/role.h>
#include <linux/usb/usb_phy_generic.h>
#include "musb_core.h"
#include "musb_dma.h"

#define USB_L1INTS		0x00a0
#define USB_L1INTM		0x00a4
#define MTK_MUSB_TXFUNCADDR	0x0480

/* MediaTek controller toggle enable and status reg */
#define MUSB_RXTOG		0x80
#define MUSB_RXTOGEN		0x82
#define MUSB_TXTOG		0x84
#define MUSB_TXTOGEN		0x86
#define MTK_TOGGLE_EN		GENMASK(15, 0)

#define TX_INT_STATUS		BIT(0)
#define RX_INT_STATUS		BIT(1)
#define USBCOM_INT_STATUS	BIT(2)
#define DMA_INT_STATUS		BIT(3)

#define DMA_INTR_STATUS_MSK	GENMASK(7, 0)
#define DMA_INTR_UNMASK_SET_MSK	GENMASK(31, 24)

struct mtk_glue {
	struct device *dev;
	struct musb *musb;
	struct platform_device *musb_pdev;
	struct platform_device *usb_phy;
	struct phy *phy;
	struct usb_phy *xceiv;
	enum phy_mode phy_mode;
	struct clk *main;
	struct clk *mcu;
	struct clk *univpll;
	enum usb_role role;
	struct usb_role_switch *role_sw;
};

static int mtk_musb_clks_get(struct mtk_glue *glue)
{
	struct device *dev = glue->dev;

	glue->main = devm_clk_get(dev, "main");
	if (IS_ERR(glue->main)) {
		dev_err(dev, "fail to get main clock\n");
		return PTR_ERR(glue->main);
	}

	glue->mcu = devm_clk_get(dev, "mcu");
	if (IS_ERR(glue->mcu)) {
		dev_err(dev, "fail to get mcu clock\n");
		return PTR_ERR(glue->mcu);
	}

	glue->univpll = devm_clk_get(dev, "univpll");
	if (IS_ERR(glue->univpll)) {
		dev_err(dev, "fail to get univpll clock\n");
		return PTR_ERR(glue->univpll);
	}

	return 0;
}

static int mtk_musb_clks_enable(struct mtk_glue *glue)
{
	int ret;

	ret = clk_prepare_enable(glue->main);
	if (ret) {
		dev_err(glue->dev, "failed to enable main clock\n");
		goto err_main_clk;
	}

	ret = clk_prepare_enable(glue->mcu);
	if (ret) {
		dev_err(glue->dev, "failed to enable mcu clock\n");
		goto err_mcu_clk;
	}

	ret = clk_prepare_enable(glue->univpll);
	if (ret) {
		dev_err(glue->dev, "failed to enable univpll clock\n");
		goto err_univpll_clk;
	}

	return 0;

err_univpll_clk:
	clk_disable_unprepare(glue->mcu);
err_mcu_clk:
	clk_disable_unprepare(glue->main);
err_main_clk:
	return ret;
}

static void mtk_musb_clks_disable(struct mtk_glue *glue)
{
	clk_disable_unprepare(glue->univpll);
	clk_disable_unprepare(glue->mcu);
	clk_disable_unprepare(glue->main);
}

static int mtk_otg_switch_set(struct mtk_glue *glue, enum usb_role role)
{
	struct musb *musb = glue->musb;
	u8 devctl = readb(musb->mregs + MUSB_DEVCTL);
	enum usb_role new_role;

	if (role == glue->role)
		return 0;

	switch (role) {
	case USB_ROLE_HOST:
		musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE;
		glue->phy_mode = PHY_MODE_USB_HOST;
		new_role = USB_ROLE_HOST;
		if (glue->role == USB_ROLE_NONE)
			phy_power_on(glue->phy);

		devctl |= MUSB_DEVCTL_SESSION;
		musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
		MUSB_HST_MODE(musb);
		break;
	case USB_ROLE_DEVICE:
		musb->xceiv->otg->state = OTG_STATE_B_IDLE;
		glue->phy_mode = PHY_MODE_USB_DEVICE;
		new_role = USB_ROLE_DEVICE;
		devctl &= ~MUSB_DEVCTL_SESSION;
		musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
		if (glue->role == USB_ROLE_NONE)
			phy_power_on(glue->phy);

		MUSB_DEV_MODE(musb);
		break;
	case USB_ROLE_NONE:
		glue->phy_mode = PHY_MODE_USB_OTG;
		new_role = USB_ROLE_NONE;
		devctl &= ~MUSB_DEVCTL_SESSION;
		musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
		if (glue->role != USB_ROLE_NONE)
			phy_power_off(glue->phy);

		break;
	default:
		dev_err(glue->dev, "Invalid State\n");
		return -EINVAL;
	}

	glue->role = new_role;
	phy_set_mode(glue->phy, glue->phy_mode);

	return 0;
}

static int musb_usb_role_sx_set(struct usb_role_switch *sw, enum usb_role role)
{
	return mtk_otg_switch_set(usb_role_switch_get_drvdata(sw), role);
}

static enum usb_role musb_usb_role_sx_get(struct usb_role_switch *sw)
{
	struct mtk_glue *glue = usb_role_switch_get_drvdata(sw);

	return glue->role;
}

static int mtk_otg_switch_init(struct mtk_glue *glue)
{
	struct usb_role_switch_desc role_sx_desc = { 0 };

	role_sx_desc.set = musb_usb_role_sx_set;
	role_sx_desc.get = musb_usb_role_sx_get;
	role_sx_desc.fwnode = dev_fwnode(glue->dev);
	role_sx_desc.driver_data = glue;
	glue->role_sw = usb_role_switch_register(glue->dev, &role_sx_desc);

	return PTR_ERR_OR_ZERO(glue->role_sw);
}

static void mtk_otg_switch_exit(struct mtk_glue *glue)
{
	return usb_role_switch_unregister(glue->role_sw);
}

static irqreturn_t generic_interrupt(int irq, void *__hci)
{
	unsigned long flags;
	irqreturn_t retval = IRQ_NONE;
	struct musb *musb = __hci;

	spin_lock_irqsave(&musb->lock, flags);
	musb->int_usb = musb_clearb(musb->mregs, MUSB_INTRUSB);
	musb->int_rx = musb_clearw(musb->mregs, MUSB_INTRRX);
	musb->int_tx = musb_clearw(musb->mregs, MUSB_INTRTX);

	if (musb->int_usb || musb->int_tx || musb->int_rx)
		retval = musb_interrupt(musb);

	spin_unlock_irqrestore(&musb->lock, flags);

	return retval;
}

static irqreturn_t mtk_musb_interrupt(int irq, void *dev_id)
{
	irqreturn_t retval = IRQ_NONE;
	struct musb *musb = (struct musb *)dev_id;
	u32 l1_ints;

	l1_ints = musb_readl(musb->mregs, USB_L1INTS) &
			musb_readl(musb->mregs, USB_L1INTM);

	if (l1_ints & (TX_INT_STATUS | RX_INT_STATUS | USBCOM_INT_STATUS))
		retval = generic_interrupt(irq, musb);

#if defined(CONFIG_USB_INVENTRA_DMA)
	if (l1_ints & DMA_INT_STATUS)
		retval = dma_controller_irq(irq, musb->dma_controller);
#endif
	return retval;
}

static u32 mtk_musb_busctl_offset(u8 epnum, u16 offset)
{
	return MTK_MUSB_TXFUNCADDR + offset + 8 * epnum;
}

static u8 mtk_musb_clearb(void __iomem *addr, unsigned int offset)
{
	u8 data;

	/* W1C */
	data = musb_readb(addr, offset);
	musb_writeb(addr, offset, data);
	return data;
}

static u16 mtk_musb_clearw(void __iomem *addr, unsigned int offset)
{
	u16 data;

	/* W1C */
	data = musb_readw(addr, offset);
	musb_writew(addr, offset, data);
	return data;
}

static int mtk_musb_set_mode(struct musb *musb, u8 mode)
{
	struct device *dev = musb->controller;
	struct mtk_glue *glue = dev_get_drvdata(dev->parent);
	enum phy_mode new_mode;
	enum usb_role new_role;

	switch (mode) {
	case MUSB_HOST:
		new_mode = PHY_MODE_USB_HOST;
		new_role = USB_ROLE_HOST;
		break;
	case MUSB_PERIPHERAL:
		new_mode = PHY_MODE_USB_DEVICE;
		new_role = USB_ROLE_DEVICE;
		break;
	case MUSB_OTG:
		new_mode = PHY_MODE_USB_OTG;
		new_role = USB_ROLE_NONE;
		break;
	default:
		dev_err(glue->dev, "Invalid mode request\n");
		return -EINVAL;
	}

	if (glue->phy_mode == new_mode)
		return 0;

	if (musb->port_mode != MUSB_OTG) {
		dev_err(glue->dev, "Does not support changing modes\n");
		return -EINVAL;
	}

	mtk_otg_switch_set(glue, new_role);
	return 0;
}

static int mtk_musb_init(struct musb *musb)
{
	struct device *dev = musb->controller;
	struct mtk_glue *glue = dev_get_drvdata(dev->parent);
	int ret;

	glue->musb = musb;
	musb->phy = glue->phy;
	musb->xceiv = glue->xceiv;
	musb->is_host = false;
	musb->isr = mtk_musb_interrupt;

	/* Set TX/RX toggle enable */
	musb_writew(musb->mregs, MUSB_TXTOGEN, MTK_TOGGLE_EN);
	musb_writew(musb->mregs, MUSB_RXTOGEN, MTK_TOGGLE_EN);

	if (musb->port_mode == MUSB_OTG) {
		ret = mtk_otg_switch_init(glue);
		if (ret)
			return ret;
	}

	ret = phy_init(glue->phy);
	if (ret)
		goto err_phy_init;

	ret = phy_power_on(glue->phy);
	if (ret)
		goto err_phy_power_on;

	phy_set_mode(glue->phy, glue->phy_mode);

#if defined(CONFIG_USB_INVENTRA_DMA)
	musb_writel(musb->mregs, MUSB_HSDMA_INTR,
		    DMA_INTR_STATUS_MSK | DMA_INTR_UNMASK_SET_MSK);
#endif
	musb_writel(musb->mregs, USB_L1INTM, TX_INT_STATUS | RX_INT_STATUS |
		    USBCOM_INT_STATUS | DMA_INT_STATUS);
	return 0;

err_phy_power_on:
	phy_exit(glue->phy);
err_phy_init:
	mtk_otg_switch_exit(glue);
	return ret;
}

static u16 mtk_musb_get_toggle(struct musb_qh *qh, int is_out)
{
	struct musb *musb = qh->hw_ep->musb;
	u8 epnum = qh->hw_ep->epnum;
	u16 toggle;

	toggle = musb_readw(musb->mregs, is_out ? MUSB_TXTOG : MUSB_RXTOG);
	return toggle & (1 << epnum);
}

static u16 mtk_musb_set_toggle(struct musb_qh *qh, int is_out, struct urb *urb)
{
	struct musb *musb = qh->hw_ep->musb;
	u8 epnum = qh->hw_ep->epnum;
	u16 value, toggle;

	toggle = usb_gettoggle(urb->dev, qh->epnum, is_out);

	if (is_out) {
		value = musb_readw(musb->mregs, MUSB_TXTOG);
		value |= toggle << epnum;
		musb_writew(musb->mregs, MUSB_TXTOG, value);
	} else {
		value = musb_readw(musb->mregs, MUSB_RXTOG);
		value |= toggle << epnum;
		musb_writew(musb->mregs, MUSB_RXTOG, value);
	}

	return 0;
}

static int mtk_musb_exit(struct musb *musb)
{
	struct device *dev = musb->controller;
	struct mtk_glue *glue = dev_get_drvdata(dev->parent);

	mtk_otg_switch_exit(glue);
	phy_power_off(glue->phy);
	phy_exit(glue->phy);
	mtk_musb_clks_disable(glue);

	pm_runtime_put_sync(dev);
	pm_runtime_disable(dev);
	return 0;
}

static const struct musb_platform_ops mtk_musb_ops = {
	.quirks = MUSB_DMA_INVENTRA,
	.init = mtk_musb_init,
	.get_toggle = mtk_musb_get_toggle,
	.set_toggle = mtk_musb_set_toggle,
	.exit = mtk_musb_exit,
#ifdef CONFIG_USB_INVENTRA_DMA
	.dma_init = musbhs_dma_controller_create_noirq,
	.dma_exit = musbhs_dma_controller_destroy,
#endif
	.clearb = mtk_musb_clearb,
	.clearw = mtk_musb_clearw,
	.busctl_offset = mtk_musb_busctl_offset,
	.set_mode = mtk_musb_set_mode,
};

#define MTK_MUSB_MAX_EP_NUM	8
#define MTK_MUSB_RAM_BITS	11

static struct musb_fifo_cfg mtk_musb_mode_cfg[] = {
	{ .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, },
	{ .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, },
	{ .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, },
	{ .hw_ep_num = 2, .style = FIFO_RX, .maxpacket = 512, },
	{ .hw_ep_num = 3, .style = FIFO_TX, .maxpacket = 512, },
	{ .hw_ep_num = 3, .style = FIFO_RX, .maxpacket = 512, },
	{ .hw_ep_num = 4, .style = FIFO_TX, .maxpacket = 512, },
	{ .hw_ep_num = 4, .style = FIFO_RX, .maxpacket = 512, },
	{ .hw_ep_num = 5, .style = FIFO_TX, .maxpacket = 512, },
	{ .hw_ep_num = 5, .style = FIFO_RX, .maxpacket = 512, },
	{ .hw_ep_num = 6, .style = FIFO_TX, .maxpacket = 1024, },
	{ .hw_ep_num = 6, .style = FIFO_RX, .maxpacket = 1024, },
	{ .hw_ep_num = 7, .style = FIFO_TX, .maxpacket = 512, },
	{ .hw_ep_num = 7, .style = FIFO_RX, .maxpacket = 64, },
};

static const struct musb_hdrc_config mtk_musb_hdrc_config = {
	.fifo_cfg = mtk_musb_mode_cfg,
	.fifo_cfg_size = ARRAY_SIZE(mtk_musb_mode_cfg),
	.multipoint = true,
	.dyn_fifo = true,
	.num_eps = MTK_MUSB_MAX_EP_NUM,
	.ram_bits = MTK_MUSB_RAM_BITS,
};

static const struct platform_device_info mtk_dev_info = {
	.name = "musb-hdrc",
	.id = PLATFORM_DEVID_AUTO,
	.dma_mask = DMA_BIT_MASK(32),
};

static int mtk_musb_probe(struct platform_device *pdev)
{
	struct musb_hdrc_platform_data *pdata;
	struct mtk_glue *glue;
	struct platform_device_info pinfo;
	struct device *dev = &pdev->dev;
	struct device_node *np = dev->of_node;
	int ret = -ENOMEM;

	glue = devm_kzalloc(dev, sizeof(*glue), GFP_KERNEL);
	if (!glue)
		return -ENOMEM;

	glue->dev = dev;
	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
		return -ENOMEM;

	ret = of_platform_populate(np, NULL, NULL, dev);
	if (ret) {
		dev_err(dev, "failed to create child devices at %p\n", np);
		return ret;
	}

	ret = mtk_musb_clks_get(glue);
	if (ret)
		return ret;

	pdata->config = &mtk_musb_hdrc_config;
	pdata->platform_ops = &mtk_musb_ops;
	pdata->mode = usb_get_dr_mode(dev);

	if (IS_ENABLED(CONFIG_USB_MUSB_HOST))
		pdata->mode = USB_DR_MODE_HOST;
	else if (IS_ENABLED(CONFIG_USB_MUSB_GADGET))
		pdata->mode = USB_DR_MODE_PERIPHERAL;

	switch (pdata->mode) {
	case USB_DR_MODE_HOST:
		glue->phy_mode = PHY_MODE_USB_HOST;
		glue->role = USB_ROLE_HOST;
		break;
	case USB_DR_MODE_PERIPHERAL:
		glue->phy_mode = PHY_MODE_USB_DEVICE;
		glue->role = USB_ROLE_DEVICE;
		break;
	case USB_DR_MODE_OTG:
		glue->phy_mode = PHY_MODE_USB_OTG;
		glue->role = USB_ROLE_NONE;
		break;
	default:
		dev_err(&pdev->dev, "Error 'dr_mode' property\n");
		return -EINVAL;
	}

	glue->phy = devm_of_phy_get_by_index(dev, np, 0);
	if (IS_ERR(glue->phy)) {
		dev_err(dev, "fail to getting phy %ld\n",
			PTR_ERR(glue->phy));
		return PTR_ERR(glue->phy);
	}

	glue->usb_phy = usb_phy_generic_register();
	if (IS_ERR(glue->usb_phy)) {
		dev_err(dev, "fail to registering usb-phy %ld\n",
			PTR_ERR(glue->usb_phy));
		return PTR_ERR(glue->usb_phy);
	}

	glue->xceiv = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
	if (IS_ERR(glue->xceiv)) {
		dev_err(dev, "fail to getting usb-phy %d\n", ret);
		ret = PTR_ERR(glue->xceiv);
		goto err_unregister_usb_phy;
	}

	platform_set_drvdata(pdev, glue);
	pm_runtime_enable(dev);
	pm_runtime_get_sync(dev);

	ret = mtk_musb_clks_enable(glue);
	if (ret)
		goto err_enable_clk;

	pinfo = mtk_dev_info;
	pinfo.parent = dev;
	pinfo.res = pdev->resource;
	pinfo.num_res = pdev->num_resources;
	pinfo.data = pdata;
	pinfo.size_data = sizeof(*pdata);

	glue->musb_pdev = platform_device_register_full(&pinfo);
	if (IS_ERR(glue->musb_pdev)) {
		ret = PTR_ERR(glue->musb_pdev);
		dev_err(dev, "failed to register musb device: %d\n", ret);
		goto err_device_register;
	}

	return 0;

err_device_register:
	mtk_musb_clks_disable(glue);
err_enable_clk:
	pm_runtime_put_sync(dev);
	pm_runtime_disable(dev);
err_unregister_usb_phy:
	usb_phy_generic_unregister(glue->usb_phy);
	return ret;
}

static int mtk_musb_remove(struct platform_device *pdev)
{
	struct mtk_glue *glue = platform_get_drvdata(pdev);
	struct platform_device *usb_phy = glue->usb_phy;

	platform_device_unregister(glue->musb_pdev);
	usb_phy_generic_unregister(usb_phy);

	return 0;
}

#ifdef CONFIG_OF
static const struct of_device_id mtk_musb_match[] = {
	{.compatible = "mediatek,mtk-musb",},
	{},
};
MODULE_DEVICE_TABLE(of, mtk_musb_match);
#endif

static struct platform_driver mtk_musb_driver = {
	.probe = mtk_musb_probe,
	.remove = mtk_musb_remove,
	.driver = {
		   .name = "musb-mtk",
		   .of_match_table = of_match_ptr(mtk_musb_match),
	},
};

module_platform_driver(mtk_musb_driver);

MODULE_DESCRIPTION("MediaTek MUSB Glue Layer");
MODULE_AUTHOR("Min Guo <min.guo@mediatek.com>");
MODULE_LICENSE("GPL v2");