summaryrefslogtreecommitdiff
path: root/drivers/usb/host/xhci-histb.c
blob: 5546e7e013a8895f8968573c464f84d341f81f4d (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
// SPDX-License-Identifier: GPL-2.0
/*
 * xHCI host controller driver for HiSilicon STB SoCs
 *
 * Copyright (C) 2017-2018 HiSilicon Co., Ltd. http://www.hisilicon.com
 *
 * Authors: Jianguo Sun <sunjianguo1@huawei.com>
 */

#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/reset.h>

#include "xhci.h"

#define GTXTHRCFG		0xc108
#define GRXTHRCFG		0xc10c
#define REG_GUSB2PHYCFG0	0xc200
#define BIT_UTMI_8_16		BIT(3)
#define BIT_UTMI_ULPI		BIT(4)
#define BIT_FREECLK_EXIST	BIT(30)

#define REG_GUSB3PIPECTL0	0xc2c0
#define USB3_DEEMPHASIS_MASK	GENMASK(2, 1)
#define USB3_DEEMPHASIS0	BIT(1)
#define USB3_TX_MARGIN1		BIT(4)

struct xhci_hcd_histb {
	struct device		*dev;
	struct usb_hcd		*hcd;
	void __iomem		*ctrl;
	struct clk		*bus_clk;
	struct clk		*utmi_clk;
	struct clk		*pipe_clk;
	struct clk		*suspend_clk;
	struct reset_control	*soft_reset;
};

static inline struct xhci_hcd_histb *hcd_to_histb(struct usb_hcd *hcd)
{
	return dev_get_drvdata(hcd->self.controller);
}

static int xhci_histb_config(struct xhci_hcd_histb *histb)
{
	struct device_node *np = histb->dev->of_node;
	u32 regval;

	if (of_property_match_string(np, "phys-names", "inno") >= 0) {
		/* USB2 PHY chose ulpi 8bit interface */
		regval = readl(histb->ctrl + REG_GUSB2PHYCFG0);
		regval &= ~BIT_UTMI_ULPI;
		regval &= ~(BIT_UTMI_8_16);
		regval &= ~BIT_FREECLK_EXIST;
		writel(regval, histb->ctrl + REG_GUSB2PHYCFG0);
	}

	if (of_property_match_string(np, "phys-names", "combo") >= 0) {
		/*
		 * write 0x010c0012 to GUSB3PIPECTL0
		 * GUSB3PIPECTL0[5:3] = 010 : Tx Margin = 900mV ,
		 * decrease TX voltage
		 * GUSB3PIPECTL0[2:1] = 01 : Tx Deemphasis = -3.5dB,
		 * refer to xHCI spec
		 */
		regval = readl(histb->ctrl + REG_GUSB3PIPECTL0);
		regval &= ~USB3_DEEMPHASIS_MASK;
		regval |= USB3_DEEMPHASIS0;
		regval |= USB3_TX_MARGIN1;
		writel(regval, histb->ctrl + REG_GUSB3PIPECTL0);
	}

	writel(0x23100000, histb->ctrl + GTXTHRCFG);
	writel(0x23100000, histb->ctrl + GRXTHRCFG);

	return 0;
}

static int xhci_histb_clks_get(struct xhci_hcd_histb *histb)
{
	struct device *dev = histb->dev;

	histb->bus_clk = devm_clk_get(dev, "bus");
	if (IS_ERR(histb->bus_clk)) {
		dev_err(dev, "fail to get bus clk\n");
		return PTR_ERR(histb->bus_clk);
	}

	histb->utmi_clk = devm_clk_get(dev, "utmi");
	if (IS_ERR(histb->utmi_clk)) {
		dev_err(dev, "fail to get utmi clk\n");
		return PTR_ERR(histb->utmi_clk);
	}

	histb->pipe_clk = devm_clk_get(dev, "pipe");
	if (IS_ERR(histb->pipe_clk)) {
		dev_err(dev, "fail to get pipe clk\n");
		return PTR_ERR(histb->pipe_clk);
	}

	histb->suspend_clk = devm_clk_get(dev, "suspend");
	if (IS_ERR(histb->suspend_clk)) {
		dev_err(dev, "fail to get suspend clk\n");
		return PTR_ERR(histb->suspend_clk);
	}

	return 0;
}

static int xhci_histb_host_enable(struct xhci_hcd_histb *histb)
{
	int ret;

	ret = clk_prepare_enable(histb->bus_clk);
	if (ret) {
		dev_err(histb->dev, "failed to enable bus clk\n");
		return ret;
	}

	ret = clk_prepare_enable(histb->utmi_clk);
	if (ret) {
		dev_err(histb->dev, "failed to enable utmi clk\n");
		goto err_utmi_clk;
	}

	ret = clk_prepare_enable(histb->pipe_clk);
	if (ret) {
		dev_err(histb->dev, "failed to enable pipe clk\n");
		goto err_pipe_clk;
	}

	ret = clk_prepare_enable(histb->suspend_clk);
	if (ret) {
		dev_err(histb->dev, "failed to enable suspend clk\n");
		goto err_suspend_clk;
	}

	reset_control_deassert(histb->soft_reset);

	return 0;

err_suspend_clk:
	clk_disable_unprepare(histb->pipe_clk);
err_pipe_clk:
	clk_disable_unprepare(histb->utmi_clk);
err_utmi_clk:
	clk_disable_unprepare(histb->bus_clk);

	return ret;
}

static void xhci_histb_host_disable(struct xhci_hcd_histb *histb)
{
	reset_control_assert(histb->soft_reset);

	clk_disable_unprepare(histb->suspend_clk);
	clk_disable_unprepare(histb->pipe_clk);
	clk_disable_unprepare(histb->utmi_clk);
	clk_disable_unprepare(histb->bus_clk);
}

static void xhci_histb_quirks(struct device *dev, struct xhci_hcd *xhci)
{
	/*
	 * As of now platform drivers don't provide MSI support so we ensure
	 * here that the generic code does not try to make a pci_dev from our
	 * dev struct in order to setup MSI
	 */
	xhci->quirks |= XHCI_PLAT;
}

/* called during probe() after chip reset completes */
static int xhci_histb_setup(struct usb_hcd *hcd)
{
	struct xhci_hcd_histb *histb = hcd_to_histb(hcd);
	int ret;

	if (usb_hcd_is_primary_hcd(hcd)) {
		ret = xhci_histb_config(histb);
		if (ret)
			return ret;
	}

	return xhci_gen_setup(hcd, xhci_histb_quirks);
}

static const struct xhci_driver_overrides xhci_histb_overrides __initconst = {
	.reset = xhci_histb_setup,
};

static struct hc_driver __read_mostly xhci_histb_hc_driver;
static int xhci_histb_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct xhci_hcd_histb *histb;
	const struct hc_driver *driver;
	struct usb_hcd *hcd;
	struct xhci_hcd *xhci;
	struct resource *res;
	int irq;
	int ret = -ENODEV;

	if (usb_disabled())
		return -ENODEV;

	driver = &xhci_histb_hc_driver;
	histb = devm_kzalloc(dev, sizeof(*histb), GFP_KERNEL);
	if (!histb)
		return -ENOMEM;

	histb->dev = dev;

	irq = platform_get_irq(pdev, 0);
	if (irq < 0)
		return irq;

	histb->ctrl = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
	if (IS_ERR(histb->ctrl))
		return PTR_ERR(histb->ctrl);

	ret = xhci_histb_clks_get(histb);
	if (ret)
		return ret;

	histb->soft_reset = devm_reset_control_get(dev, "soft");
	if (IS_ERR(histb->soft_reset)) {
		dev_err(dev, "failed to get soft reset\n");
		return PTR_ERR(histb->soft_reset);
	}

	pm_runtime_enable(dev);
	pm_runtime_get_sync(dev);
	device_enable_async_suspend(dev);

	/* Initialize dma_mask and coherent_dma_mask to 32-bits */
	ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
	if (ret)
		return ret;

	hcd = usb_create_hcd(driver, dev, dev_name(dev));
	if (!hcd) {
		ret = -ENOMEM;
		goto disable_pm;
	}

	hcd->regs = histb->ctrl;
	hcd->rsrc_start = res->start;
	hcd->rsrc_len = resource_size(res);

	histb->hcd = hcd;
	dev_set_drvdata(hcd->self.controller, histb);

	ret = xhci_histb_host_enable(histb);
	if (ret)
		goto put_hcd;

	xhci = hcd_to_xhci(hcd);

	device_wakeup_enable(hcd->self.controller);

	xhci->main_hcd = hcd;
	xhci->shared_hcd = usb_create_shared_hcd(driver, dev, dev_name(dev),
						 hcd);
	if (!xhci->shared_hcd) {
		ret = -ENOMEM;
		goto disable_host;
	}

	if (device_property_read_bool(dev, "usb2-lpm-disable"))
		xhci->quirks |= XHCI_HW_LPM_DISABLE;

	if (device_property_read_bool(dev, "usb3-lpm-capable"))
		xhci->quirks |= XHCI_LPM_SUPPORT;

	/* imod_interval is the interrupt moderation value in nanoseconds. */
	xhci->imod_interval = 40000;
	device_property_read_u32(dev, "imod-interval-ns",
				 &xhci->imod_interval);

	ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
	if (ret)
		goto put_usb3_hcd;

	if (HCC_MAX_PSA(xhci->hcc_params) >= 4)
		xhci->shared_hcd->can_do_streams = 1;

	ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED);
	if (ret)
		goto dealloc_usb2_hcd;

	device_enable_async_suspend(dev);
	pm_runtime_put_noidle(dev);

	/*
	 * Prevent runtime pm from being on as default, users should enable
	 * runtime pm using power/control in sysfs.
	 */
	pm_runtime_forbid(dev);

	return 0;

dealloc_usb2_hcd:
	usb_remove_hcd(hcd);
put_usb3_hcd:
	usb_put_hcd(xhci->shared_hcd);
disable_host:
	xhci_histb_host_disable(histb);
put_hcd:
	usb_put_hcd(hcd);
disable_pm:
	pm_runtime_put_sync(dev);
	pm_runtime_disable(dev);

	return ret;
}

static int xhci_histb_remove(struct platform_device *dev)
{
	struct xhci_hcd_histb *histb = platform_get_drvdata(dev);
	struct usb_hcd *hcd = histb->hcd;
	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
	struct usb_hcd *shared_hcd = xhci->shared_hcd;

	xhci->xhc_state |= XHCI_STATE_REMOVING;

	usb_remove_hcd(shared_hcd);
	xhci->shared_hcd = NULL;
	device_wakeup_disable(&dev->dev);

	usb_remove_hcd(hcd);
	usb_put_hcd(shared_hcd);

	xhci_histb_host_disable(histb);
	usb_put_hcd(hcd);
	pm_runtime_put_sync(&dev->dev);
	pm_runtime_disable(&dev->dev);

	return 0;
}

static int __maybe_unused xhci_histb_suspend(struct device *dev)
{
	struct xhci_hcd_histb *histb = dev_get_drvdata(dev);
	struct usb_hcd *hcd = histb->hcd;
	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
	int ret;

	ret = xhci_suspend(xhci, device_may_wakeup(dev));

	if (!device_may_wakeup(dev))
		xhci_histb_host_disable(histb);

	return ret;
}

static int __maybe_unused xhci_histb_resume(struct device *dev)
{
	struct xhci_hcd_histb *histb = dev_get_drvdata(dev);
	struct usb_hcd *hcd = histb->hcd;
	struct xhci_hcd *xhci = hcd_to_xhci(hcd);

	if (!device_may_wakeup(dev))
		xhci_histb_host_enable(histb);

	return xhci_resume(xhci, 0);
}

static const struct dev_pm_ops xhci_histb_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(xhci_histb_suspend, xhci_histb_resume)
};
#define DEV_PM_OPS (IS_ENABLED(CONFIG_PM) ? &xhci_histb_pm_ops : NULL)

#ifdef CONFIG_OF
static const struct of_device_id histb_xhci_of_match[] = {
	{ .compatible = "hisilicon,hi3798cv200-xhci"},
	{ },
};
MODULE_DEVICE_TABLE(of, histb_xhci_of_match);
#endif

static struct platform_driver histb_xhci_driver = {
	.probe	= xhci_histb_probe,
	.remove	= xhci_histb_remove,
	.driver	= {
		.name = "xhci-histb",
		.pm = DEV_PM_OPS,
		.of_match_table = of_match_ptr(histb_xhci_of_match),
	},
};
MODULE_ALIAS("platform:xhci-histb");

static int __init xhci_histb_init(void)
{
	xhci_init_driver(&xhci_histb_hc_driver, &xhci_histb_overrides);
	return platform_driver_register(&histb_xhci_driver);
}
module_init(xhci_histb_init);

static void __exit xhci_histb_exit(void)
{
	platform_driver_unregister(&histb_xhci_driver);
}
module_exit(xhci_histb_exit);

MODULE_DESCRIPTION("HiSilicon STB xHCI Host Controller Driver");
MODULE_LICENSE("GPL v2");