aboutsummaryrefslogtreecommitdiffstats
path: root/target/linux/sunxi/patches-3.12/153-add-sunxi-ehci.patch
blob: 8a78c2d54b9abb9b5c745a4b93f38491ea615885 (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
From b84d49247eb062672a56ce15f1c08f792099de97 Mon Sep 17 00:00:00 2001
From: arokux <arokux@gmail.com>
Date: Wed, 18 Sep 2013 21:45:03 +0200
Subject: [PATCH] ARM: sunxi: usb: Add Allwinner sunXi EHCI driver

---
 drivers/usb/host/Kconfig      |   9 +
 drivers/usb/host/Makefile     |   1 +
 drivers/usb/host/ehci-sunxi.c | 446 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 456 insertions(+)
 create mode 100644 drivers/usb/host/ehci-sunxi.c

diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index b3f20d7..ecc2745 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -274,6 +274,15 @@ config USB_OCTEON_EHCI
 	  USB 2.0 device support.  All CN6XXX based chips with USB are
 	  supported.
 
+config USB_SUNXI_EHCI
+	tristate "Allwinner sunXi EHCI support"
+	depends on ARCH_SUNXI
+	default n
+	help
+	  Enable support for the Allwinner sunXi on-chip EHCI
+	  controller. It is needed for high-speed (480Mbit/sec)
+	  USB 2.0 device support.
+
 endif # USB_EHCI_HCD
 
 config USB_OXU210HP_HCD
diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
index 50b0041..d2e2c8c 100644
--- a/drivers/usb/host/Makefile
+++ b/drivers/usb/host/Makefile
@@ -38,6 +38,7 @@ obj-$(CONFIG_USB_EHCI_S5P)	+= ehci-s5p.o
 obj-$(CONFIG_USB_EHCI_HCD_AT91) += ehci-atmel.o
 obj-$(CONFIG_USB_EHCI_MSM)	+= ehci-msm.o
 obj-$(CONFIG_USB_EHCI_TEGRA)	+= ehci-tegra.o
+obj-$(CONFIG_USB_SUNXI_EHCI)	+= ehci-sunxi.o
 
 obj-$(CONFIG_USB_OXU210HP_HCD)	+= oxu210hp-hcd.o
 obj-$(CONFIG_USB_ISP116X_HCD)	+= isp116x-hcd.o
diff --git a/drivers/usb/host/ehci-sunxi.c b/drivers/usb/host/ehci-sunxi.c
new file mode 100644
index 0000000..e7e15cc
--- /dev/null
+++ b/drivers/usb/host/ehci-sunxi.c
@@ -0,0 +1,446 @@
+/*
+ * Copyright (C) 2013 Roman Byshko
+ *
+ * Roman Byshko <rbyshko@gmail.com>
+ *
+ * Based on code from
+ * Allwinner Technology Co., Ltd. <www.allwinnertech.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2.  This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/bitops.h>
+#include <linux/clk.h>
+#include <linux/dma-mapping.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+#include <linux/reset.h>
+#include <linux/usb.h>
+#include <linux/usb/hcd.h>
+
+#include "ehci.h"
+
+#define DRV_DESC	"Allwinner sunXi EHCI driver"
+#define DRV_NAME	"sunxi-ehci"
+
+#define SUNXI_USB_PASSBY_EN	1
+
+#define SUNXI_EHCI_AHB_ICHR8_EN		BIT(10)
+#define SUNXI_EHCI_AHB_INCR4_BURST_EN	BIT(9)
+#define SUNXI_EHCI_AHB_INCRX_ALIGN_EN	BIT(8)
+#define SUNXI_EHCI_ULPI_BYPASS_EN	BIT(0)
+
+struct sunxi_ehci_hcd {
+	struct clk *phy_clk;
+	struct clk *ahb_ehci_clk;
+	struct reset_control *reset;
+	struct regulator *vbus_reg;
+	void __iomem *csr;
+	void __iomem *pmuirq;
+	int irq;
+	int id;
+};
+
+
+static void usb_phy_write(struct sunxi_ehci_hcd *sunxi_ehci,u32 addr, u32 data, u32 len)
+{
+	u32 j = 0;
+	u32 temp = 0;
+	u32 usbc_bit = 0;
+	void __iomem *dest = sunxi_ehci->csr;
+
+	usbc_bit = BIT(sunxi_ehci->id << 1);
+
+	for (j = 0; j < len; j++) {
+		temp = readl(dest);
+
+		/* clear the address portion */
+		temp &= ~(0xff << 8);
+
+		/* set the address */
+		temp |= ((addr + j) << 8);
+		writel(temp, dest);
+
+		/* set the data bit and clear usbc bit*/
+		temp = readb(dest);
+		if (data & 0x1)
+			temp |= BIT(7);
+		else
+			temp &= ~BIT(7);
+		temp &= ~usbc_bit;
+		writeb(temp, dest);
+
+		/* flip usbc_bit */
+		__set_bit(usbc_bit, dest);
+		__clear_bit(usbc_bit, dest);
+
+		data >>= 1;
+	}
+}
+
+/* FIXME: should this function be protected by a lock?
+ * ehci1 and ehci0 could call it concurrently with same csr.
+ */
+static void sunxi_usb_phy_init(struct sunxi_ehci_hcd *sunxi_ehci)
+{
+	/* The following comments are machine
+	 * translated from Chinese, you have been warned!
+	 */
+
+	/* adjust PHY's magnitude and rate */
+	usb_phy_write(sunxi_ehci, 0x20, 0x14, 5);
+
+	/* threshold adjustment disconnect */
+	usb_phy_write(sunxi_ehci, 0x2a, 3, 2);
+
+	return;
+}
+
+static void sunxi_usb_passby(struct sunxi_ehci_hcd *sunxi_ehci, int enable)
+{
+	unsigned long reg_value = 0;
+	unsigned long bits = 0;
+	static DEFINE_SPINLOCK(lock);
+	unsigned long flags = 0;
+	void __iomem *addr = sunxi_ehci->pmuirq;
+
+	bits = SUNXI_EHCI_AHB_ICHR8_EN |
+		SUNXI_EHCI_AHB_INCR4_BURST_EN |
+		SUNXI_EHCI_AHB_INCRX_ALIGN_EN |
+		SUNXI_EHCI_ULPI_BYPASS_EN;
+
+	spin_lock_irqsave(&lock, flags);
+
+	reg_value = readl(addr);
+
+	if (enable)
+		reg_value |= bits;
+	else
+		reg_value &= ~bits;
+
+	writel(reg_value, addr);
+
+	spin_unlock_irqrestore(&lock, flags);
+
+	return;
+}
+
+static void sunxi_ehci_disable(struct sunxi_ehci_hcd *sunxi_ehci)
+{
+	regulator_disable(sunxi_ehci->vbus_reg);
+
+	sunxi_usb_passby(sunxi_ehci, !SUNXI_USB_PASSBY_EN);
+
+	clk_disable_unprepare(sunxi_ehci->ahb_ehci_clk);
+	clk_disable_unprepare(sunxi_ehci->phy_clk);
+
+	reset_control_assert(sunxi_ehci->reset);
+}
+
+static int sunxi_ehci_enable(struct sunxi_ehci_hcd *sunxi_ehci)
+{
+	int ret;
+
+	ret = clk_prepare_enable(sunxi_ehci->phy_clk);
+	if (ret)
+		return ret;
+
+	ret = reset_control_deassert(sunxi_ehci->reset);
+	if (ret)
+		goto fail1;
+
+	ret = clk_prepare_enable(sunxi_ehci->ahb_ehci_clk);
+	if (ret)
+		goto fail2;
+
+	sunxi_usb_phy_init(sunxi_ehci);
+
+	sunxi_usb_passby(sunxi_ehci, SUNXI_USB_PASSBY_EN);
+
+	ret = regulator_enable(sunxi_ehci->vbus_reg);
+	if (ret)
+		goto fail3;
+
+	return 0;
+
+fail3:
+	clk_disable_unprepare(sunxi_ehci->ahb_ehci_clk);
+fail2:
+	reset_control_assert(sunxi_ehci->reset);
+fail1:
+	clk_disable_unprepare(sunxi_ehci->phy_clk);
+
+	return ret;
+}
+
+#ifdef CONFIG_PM
+static int sunxi_ehci_suspend(struct device *dev)
+{
+	struct sunxi_ehci_hcd *sunxi_ehci = NULL;
+	struct usb_hcd *hcd = dev_get_drvdata(dev);
+	int ret;
+
+	bool do_wakeup = device_may_wakeup(dev);
+
+	ret = ehci_suspend(hcd, do_wakeup);
+
+	sunxi_ehci = (struct sunxi_ehci_hcd *)hcd_to_ehci(hcd)->priv;
+
+	sunxi_ehci_disable(sunxi_ehci);
+
+	return ret;
+}
+
+static int sunxi_ehci_resume(struct device *dev)
+{
+	struct sunxi_ehci_hcd *sunxi_ehci = NULL;
+	struct usb_hcd *hcd = dev_get_drvdata(dev);
+	int ret;
+
+	sunxi_ehci = (struct sunxi_ehci_hcd *)hcd_to_ehci(hcd)->priv;
+
+	ret = sunxi_ehci_enable(sunxi_ehci);
+	if (ret)
+		return ret;
+
+	return ehci_resume(hcd, false);
+}
+
+
+static const struct dev_pm_ops sunxi_ehci_pmops = {
+	.suspend	= sunxi_ehci_suspend,
+	.resume		= sunxi_ehci_resume,
+};
+
+#define SUNXI_EHCI_PMOPS (&sunxi_ehci_pmops)
+#else /* !CONFIG_PM */
+#define SUNXI_EHCI_PMOPS NULL
+#endif /* CONFIG_PM */
+
+static const struct ehci_driver_overrides sunxi_overrides __initconst = {
+	.reset =	NULL,
+	.extra_priv_size	= sizeof(struct sunxi_ehci_hcd),
+};
+
+/* FIXME: Should there be two instances of hc_driver,
+ * or one is enough to handle two EHCI controllers? */
+static struct hc_driver __read_mostly sunxi_ehci_hc_driver;
+
+static int sunxi_ehci_init(struct platform_device *pdev, struct usb_hcd *hcd,
+			   struct sunxi_ehci_hcd *sunxi_ehci)
+{
+	void __iomem *ehci_regs = NULL;
+	struct resource *res = NULL;
+
+	sunxi_ehci->vbus_reg = devm_regulator_get(&pdev->dev, "vbus");
+	if (IS_ERR(sunxi_ehci->vbus_reg)) {
+		if (PTR_ERR(sunxi_ehci->vbus_reg) == -EPROBE_DEFER)
+			return -EPROBE_DEFER;
+
+		dev_info(&pdev->dev, "no USB VBUS power supply found\n");
+	}
+
+	sunxi_ehci->id = of_alias_get_id(pdev->dev.of_node, "ehci");
+	if (sunxi_ehci->id < 0)
+		return sunxi_ehci->id;
+
+	/* FIXME: should res be freed on some failure? */
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(&pdev->dev, "failed to get I/O memory\n");
+		return -ENXIO;
+	}
+	ehci_regs = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(ehci_regs))
+		return PTR_ERR(ehci_regs);
+
+	hcd->rsrc_start = res->start;
+	hcd->rsrc_len = resource_size(res);
+	hcd->regs = ehci_regs;
+	hcd_to_ehci(hcd)->caps = ehci_regs;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	if (!res) {
+		dev_err(&pdev->dev, "failed to get I/O memory\n");
+		return -ENXIO;
+	}
+	sunxi_ehci->pmuirq = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(sunxi_ehci->pmuirq))
+		return PTR_ERR(sunxi_ehci->pmuirq);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
+	if (!res) {
+		dev_err(&pdev->dev, "failed to get I/O memory\n");
+		return -ENXIO;
+	}
+
+	/* FIXME: this one byte needs to be shared between both EHCIs,
+	 * that is why ioremap instead of devm_ioremap_resource,
+	 * memory is not unmaped back for now.
+	 */
+	sunxi_ehci->csr = ioremap(res->start, resource_size(res));
+	if (IS_ERR(sunxi_ehci->csr)) {
+		dev_err(&pdev->dev, "failed to remap memory\n");
+		return PTR_ERR(sunxi_ehci->csr);
+	}
+
+	sunxi_ehci->irq = platform_get_irq(pdev, 0);
+	if (!sunxi_ehci->irq) {
+		dev_err(&pdev->dev, "failed to get IRQ\n");
+		return -ENODEV;
+	}
+
+	sunxi_ehci->phy_clk = devm_clk_get(&pdev->dev, "usb_phy");
+	if (IS_ERR(sunxi_ehci->phy_clk)) {
+		dev_err(&pdev->dev, "failed to get usb_phy clock\n");
+		return PTR_ERR(sunxi_ehci->phy_clk);
+	}
+	sunxi_ehci->ahb_ehci_clk = devm_clk_get(&pdev->dev, "ahb_ehci");
+	if (IS_ERR(sunxi_ehci->ahb_ehci_clk)) {
+		dev_err(&pdev->dev, "failed to get ahb_ehci clock\n");
+		return PTR_ERR(sunxi_ehci->ahb_ehci_clk);
+	}
+
+	sunxi_ehci->reset = reset_control_get(&pdev->dev, "ehci_reset");
+	if (IS_ERR(sunxi_ehci->reset))
+	{
+		dev_err(&pdev->dev, "failed to get ehci_reset reset line\n");
+		return PTR_ERR(sunxi_ehci->reset);
+	}
+
+	return 0;
+}
+
+static int sunxi_ehci_probe(struct platform_device *pdev)
+{
+	struct sunxi_ehci_hcd *sunxi_ehci = NULL;
+	struct usb_hcd *hcd = NULL;
+	int ret;
+
+	if (pdev->num_resources != 4) {
+		dev_err(&pdev->dev, "invalid number of resources: %i\n",
+		       pdev->num_resources);
+		return -ENODEV;
+	}
+
+	if (pdev->resource[0].flags != IORESOURCE_MEM
+			|| pdev->resource[1].flags != IORESOURCE_MEM
+			|| pdev->resource[2].flags != IORESOURCE_MEM
+			|| pdev->resource[3].flags != IORESOURCE_IRQ) {
+		dev_err(&pdev->dev, "invalid resource type\n");
+		return -ENODEV;
+	}
+
+	if (!pdev->dev.dma_mask)
+		pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
+	if (!pdev->dev.coherent_dma_mask)
+		pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
+
+	hcd = usb_create_hcd(&sunxi_ehci_hc_driver, &pdev->dev,
+			     dev_name(&pdev->dev));
+	if (!hcd) {
+		dev_err(&pdev->dev, "unable to create HCD\n");
+		return -ENOMEM;
+	}
+
+	platform_set_drvdata(pdev, hcd);
+
+	sunxi_ehci = (struct sunxi_ehci_hcd *)hcd_to_ehci(hcd)->priv;
+	ret = sunxi_ehci_init(pdev, hcd, sunxi_ehci);
+	if (ret)
+		goto fail1;
+
+	ret = sunxi_ehci_enable(sunxi_ehci);
+	if (ret)
+		goto fail1;
+
+	ret = usb_add_hcd(hcd, sunxi_ehci->irq, IRQF_SHARED | IRQF_DISABLED);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to add USB HCD\n");
+		goto fail2;
+	}
+
+	return 0;
+
+fail2:
+	sunxi_ehci_disable(sunxi_ehci);
+
+fail1:
+	usb_put_hcd(hcd);
+	return ret;
+}
+
+static int sunxi_ehci_remove(struct platform_device *pdev)
+{
+	struct usb_hcd *hcd = platform_get_drvdata(pdev);
+	struct sunxi_ehci_hcd *sunxi_ehci = NULL;
+
+	sunxi_ehci = (struct sunxi_ehci_hcd *)hcd_to_ehci(hcd)->priv;
+
+	usb_remove_hcd(hcd);
+
+	sunxi_ehci_disable(sunxi_ehci);
+
+	usb_put_hcd(hcd);
+
+	return 0;
+}
+
+static void sunxi_ehci_shutdown(struct platform_device *pdev)
+{
+	struct usb_hcd *hcd = platform_get_drvdata(pdev);
+	struct sunxi_ehci_hcd *sunxi_ehci = NULL;
+
+	sunxi_ehci = (struct sunxi_ehci_hcd *)hcd_to_ehci(hcd)->priv;
+
+	usb_hcd_platform_shutdown(pdev);
+
+	sunxi_ehci_disable(sunxi_ehci);
+}
+
+static const struct of_device_id ehci_of_match[] = {
+	{.compatible = "allwinner,sunxi-ehci"},
+	{},
+};
+
+static struct platform_driver ehci_sunxi_driver = {
+	.driver = {
+		.of_match_table = ehci_of_match,
+		.name = DRV_NAME,
+		.pm = SUNXI_EHCI_PMOPS,
+	},
+	.probe = sunxi_ehci_probe,
+	.remove = sunxi_ehci_remove,
+	.shutdown = sunxi_ehci_shutdown,
+};
+
+static int __init sunxi_ehci_init_module(void)
+{
+	if (usb_disabled())
+		return -ENODEV;
+
+	pr_info(DRV_NAME ": " DRV_DESC "\n");
+
+	ehci_init_driver(&sunxi_ehci_hc_driver, &sunxi_overrides);
+
+	return platform_driver_register(&ehci_sunxi_driver);
+}
+module_init(sunxi_ehci_init_module);
+
+static void __exit sunxi_ehci_exit_module(void)
+{
+	platform_driver_unregister(&ehci_sunxi_driver);
+}
+module_exit(sunxi_ehci_exit_module);
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRV_NAME);
+MODULE_DEVICE_TABLE(of, ehci_of_match);
+MODULE_AUTHOR("Roman Byshko <rbyshko@gmail.com>");
-- 
1.8.4