aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/usb/host/ssb-hcd.c
blob: 0196f766df734f48352fd8c5217d08963aab444f (plain) (blame)
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
/*
 * Sonics Silicon Backplane
 * Broadcom USB-core driver  (SSB bus glue)
 *
 * Copyright 2011-2012 Hauke Mehrtens <hauke@hauke-m.de>
 *
 * Based on ssb-ohci driver
 * Copyright 2007 Michael Buesch <m@bues.ch>
 *
 * Derived from the OHCI-PCI driver
 * Copyright 1999 Roman Weissgaerber
 * Copyright 2000-2002 David Brownell
 * Copyright 1999 Linus Torvalds
 * Copyright 1999 Gregory P. Smith
 *
 * Derived from the USBcore related parts of Broadcom-SB
 * Copyright 2005-2011 Broadcom Corporation
 *
 * Licensed under the GNU/GPL. See COPYING for details.
 */
#include <linux/ssb/ssb.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/usb/ehci_pdriver.h>
#include <linux/usb/ohci_pdriver.h>

MODULE_AUTHOR("Hauke Mehrtens");
MODULE_DESCRIPTION("Common USB driver for SSB Bus");
MODULE_LICENSE("GPL");

#define SSB_HCD_TMSLOW_HOSTMODE	(1 << 29)

struct ssb_hcd_device {
	struct platform_device *ehci_dev;
	struct platform_device *ohci_dev;

	u32 enable_flags;
};

static void ssb_hcd_5354wa(struct ssb_device *dev)
{
#ifdef CONFIG_SSB_DRIVER_MIPS
	/* Work around for 5354 failures */
	if (dev->id.revision == 2 && dev->bus->chip_id == 0x5354) {
		/* Change syn01 reg */
		ssb_write32(dev, 0x894, 0x00fe00fe);

		/* Change syn03 reg */
		ssb_write32(dev, 0x89c, ssb_read32(dev, 0x89c) | 0x1);
	}
#endif
}

static void ssb_hcd_usb20wa(struct ssb_device *dev)
{
	if (dev->id.coreid == SSB_DEV_USB20_HOST) {
		/*
		 * USB 2.0 special considerations:
		 *
		 * In addition to the standard SSB reset sequence, the Host
		 * Control Register must be programmed to bring the USB core
		 * and various phy components out of reset.
		 */
		ssb_write32(dev, 0x200, 0x7ff);

		/* Change Flush control reg */
		ssb_write32(dev, 0x400, ssb_read32(dev, 0x400) & ~8);
		ssb_read32(dev, 0x400);

		/* Change Shim control reg */
		ssb_write32(dev, 0x304, ssb_read32(dev, 0x304) & ~0x100);
		ssb_read32(dev, 0x304);

		udelay(1);

		ssb_hcd_5354wa(dev);
	}
}

/* based on arch/mips/brcm-boards/bcm947xx/pcibios.c */
static u32 ssb_hcd_init_chip(struct ssb_device *dev)
{
	u32 flags = 0;

	if (dev->id.coreid == SSB_DEV_USB11_HOSTDEV)
		/* Put the device into host-mode. */
		flags |= SSB_HCD_TMSLOW_HOSTMODE;

	ssb_device_enable(dev, flags);

	ssb_hcd_usb20wa(dev);

	return flags;
}

static const struct usb_ehci_pdata ehci_pdata = {
};

static const struct usb_ohci_pdata ohci_pdata = {
};

static struct platform_device *ssb_hcd_create_pdev(struct ssb_device *dev, bool ohci, u32 addr, u32 len)
{
	struct platform_device *hci_dev;
	struct resource hci_res[2];
	int ret = -ENOMEM;

	memset(hci_res, 0, sizeof(hci_res));

	hci_res[0].start = addr;
	hci_res[0].end = hci_res[0].start + len - 1;
	hci_res[0].flags = IORESOURCE_MEM;

	hci_res[1].start = dev->irq;
	hci_res[1].flags = IORESOURCE_IRQ;

	hci_dev = platform_device_alloc(ohci ? "ohci-platform" :
					"ehci-platform" , 0);
	if (!hci_dev)
		return NULL;

	hci_dev->dev.parent = dev->dev;
	hci_dev->dev.dma_mask = &hci_dev->dev.coherent_dma_mask;

	ret = platform_device_add_resources(hci_dev, hci_res,
					    ARRAY_SIZE(hci_res));
	if (ret)
		goto err_alloc;
	if (ohci)
		ret = platform_device_add_data(hci_dev, &ohci_pdata,
					       sizeof(ohci_pdata));
	else
		ret = platform_device_add_data(hci_dev, &ehci_pdata,
					       sizeof(ehci_pdata));
	if (ret)
		goto err_alloc;
	ret = platform_device_add(hci_dev);
	if (ret)
		goto err_alloc;

	return hci_dev;

err_alloc:
	platform_device_put(hci_dev);
	return ERR_PTR(ret);
}

static int ssb_hcd_probe(struct ssb_device *dev,
				   const struct ssb_device_id *id)
{
	int err, tmp;
	int start, len;
	u16 chipid_top;
	u16 coreid = dev->id.coreid;
	struct ssb_hcd_device *usb_dev;

	/* USBcores are only connected on embedded devices. */
	chipid_top = (dev->bus->chip_id & 0xFF00);
	if (chipid_top != 0x4700 && chipid_top != 0x5300)
		return -ENODEV;

	/* TODO: Probably need checks here; is the core connected? */

	if (dma_set_mask_and_coherent(dev->dma_dev, DMA_BIT_MASK(32)))
		return -EOPNOTSUPP;

	usb_dev = kzalloc(sizeof(struct ssb_hcd_device), GFP_KERNEL);
	if (!usb_dev)
		return -ENOMEM;

	/* We currently always attach SSB_DEV_USB11_HOSTDEV
	 * as HOST OHCI. If we want to attach it as Client device,
	 * we must branch here and call into the (yet to
	 * be written) Client mode driver. Same for remove(). */
	usb_dev->enable_flags = ssb_hcd_init_chip(dev);

	tmp = ssb_read32(dev, SSB_ADMATCH0);

	start = ssb_admatch_base(tmp);
	len = (coreid == SSB_DEV_USB20_HOST) ? 0x800 : ssb_admatch_size(tmp);
	usb_dev->ohci_dev = ssb_hcd_create_pdev(dev, true, start, len);
	if (IS_ERR(usb_dev->ohci_dev)) {
		err = PTR_ERR(usb_dev->ohci_dev);
		goto err_free_usb_dev;
	}

	if (coreid == SSB_DEV_USB20_HOST) {
		start = ssb_admatch_base(tmp) + 0x800; /* ehci core offset */
		usb_dev->ehci_dev = ssb_hcd_create_pdev(dev, false, start, len);
		if (IS_ERR(usb_dev->ehci_dev)) {
			err = PTR_ERR(usb_dev->ehci_dev);
			goto err_unregister_ohci_dev;
		}
	}

	ssb_set_drvdata(dev, usb_dev);
	return 0;

err_unregister_ohci_dev:
	platform_device_unregister(usb_dev->ohci_dev);
err_free_usb_dev:
	kfree(usb_dev);
	return err;
}

static void ssb_hcd_remove(struct ssb_device *dev)
{
	struct ssb_hcd_device *usb_dev = ssb_get_drvdata(dev);
	struct platform_device *ohci_dev = usb_dev->ohci_dev;
	struct platform_device *ehci_dev = usb_dev->ehci_dev;

	if (ohci_dev)
		platform_device_unregister(ohci_dev);
	if (ehci_dev)
		platform_device_unregister(ehci_dev);

	ssb_device_disable(dev, 0);
}

static void ssb_hcd_shutdown(struct ssb_device *dev)
{
	ssb_device_disable(dev, 0);
}

#ifdef CONFIG_PM

static int ssb_hcd_suspend(struct ssb_device *dev, pm_message_t state)
{
	ssb_device_disable(dev, 0);

	return 0;
}

static int ssb_hcd_resume(struct ssb_device *dev)
{
	struct ssb_hcd_device *usb_dev = ssb_get_drvdata(dev);

	ssb_device_enable(dev, usb_dev->enable_flags);

	return 0;
}

#else /* !CONFIG_PM */
#define ssb_hcd_suspend	NULL
#define ssb_hcd_resume	NULL
#endif /* CONFIG_PM */

static const struct ssb_device_id ssb_hcd_table[] = {
	SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_USB11_HOSTDEV, SSB_ANY_REV),
	SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_USB11_HOST, SSB_ANY_REV),
	SSB_DEVICE(SSB_VENDOR_BROADCOM, SSB_DEV_USB20_HOST, SSB_ANY_REV),
	SSB_DEVTABLE_END
};
MODULE_DEVICE_TABLE(ssb, ssb_hcd_table);

static struct ssb_driver ssb_hcd_driver = {
	.name		= KBUILD_MODNAME,
	.id_table	= ssb_hcd_table,
	.probe		= ssb_hcd_probe,
	.remove		= ssb_hcd_remove,
	.shutdown	= ssb_hcd_shutdown,
	.suspend	= ssb_hcd_suspend,
	.resume		= ssb_hcd_resume,
};

static int __init ssb_hcd_init(void)
{
	return ssb_driver_register(&ssb_hcd_driver);
}
module_init(ssb_hcd_init);

static void __exit ssb_hcd_exit(void)
{
	ssb_driver_unregister(&ssb_hcd_driver);
}
module_exit(ssb_hcd_exit);