aboutsummaryrefslogtreecommitdiff
path: root/drivers/usb/host/ehci-sh.c
blob: e7cb3925abf8e0276dc4c119e8e03116d0ea48bd (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
/*
 * SuperH EHCI host controller driver
 *
 * Copyright (C) 2010  Paul Mundt
 *
 * Based on ohci-sh.c and ehci-atmel.c.
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 */
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/platform_data/ehci-sh.h>

struct ehci_sh_priv {
	struct clk *iclk, *fclk;
	struct usb_hcd *hcd;
};

static int ehci_sh_reset(struct usb_hcd *hcd)
{
	struct ehci_hcd	*ehci = hcd_to_ehci(hcd);
	int ret;

	ehci->caps = hcd->regs;
	ehci->regs = hcd->regs + HC_LENGTH(ehci, ehci_readl(ehci,
		&ehci->caps->hc_capbase));

	dbg_hcs_params(ehci, "reset");
	dbg_hcc_params(ehci, "reset");

	ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);

	ret = ehci_halt(ehci);
	if (unlikely(ret))
		return ret;

	ret = ehci_init(hcd);
	if (unlikely(ret))
		return ret;

	ehci->sbrn = 0x20;

	ehci_reset(ehci);
	ehci_port_power(ehci, 0);

	return ret;
}

static const struct hc_driver ehci_sh_hc_driver = {
	.description			= hcd_name,
	.product_desc			= "SuperH EHCI",
	.hcd_priv_size			= sizeof(struct ehci_hcd),

	/*
	 * generic hardware linkage
	 */
	.irq				= ehci_irq,
	.flags				= HCD_USB2 | HCD_MEMORY,

	/*
	 * basic lifecycle operations
	 */
	.reset				= ehci_sh_reset,
	.start				= ehci_run,
	.stop				= ehci_stop,
	.shutdown			= ehci_shutdown,

	/*
	 * managing i/o requests and associated device resources
	 */
	.urb_enqueue			= ehci_urb_enqueue,
	.urb_dequeue			= ehci_urb_dequeue,
	.endpoint_disable		= ehci_endpoint_disable,
	.endpoint_reset			= ehci_endpoint_reset,

	/*
	 * scheduling support
	 */
	.get_frame_number		= ehci_get_frame,

	/*
	 * root hub support
	 */
	.hub_status_data		= ehci_hub_status_data,
	.hub_control			= ehci_hub_control,

#ifdef CONFIG_PM
	.bus_suspend			= ehci_bus_suspend,
	.bus_resume			= ehci_bus_resume,
#endif

	.relinquish_port		= ehci_relinquish_port,
	.port_handed_over		= ehci_port_handed_over,
	.clear_tt_buffer_complete	= ehci_clear_tt_buffer_complete,
};

static int ehci_hcd_sh_probe(struct platform_device *pdev)
{
	const struct hc_driver *driver = &ehci_sh_hc_driver;
	struct resource *res;
	struct ehci_sh_priv *priv;
	struct ehci_sh_platdata *pdata;
	struct usb_hcd *hcd;
	int irq, ret;

	if (usb_disabled())
		return -ENODEV;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		dev_err(&pdev->dev,
			"Found HC with no register addr. Check %s setup!\n",
			dev_name(&pdev->dev));
		ret = -ENODEV;
		goto fail_create_hcd;
	}

	irq = platform_get_irq(pdev, 0);
	if (irq <= 0) {
		dev_err(&pdev->dev,
			"Found HC with no IRQ. Check %s setup!\n",
			dev_name(&pdev->dev));
		ret = -ENODEV;
		goto fail_create_hcd;
	}

	pdata = pdev->dev.platform_data;

	/* initialize hcd */
	hcd = usb_create_hcd(&ehci_sh_hc_driver, &pdev->dev,
			     dev_name(&pdev->dev));
	if (!hcd) {
		ret = -ENOMEM;
		goto fail_create_hcd;
	}

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

	if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
				driver->description)) {
		dev_dbg(&pdev->dev, "controller already in use\n");
		ret = -EBUSY;
		goto fail_request_resource;
	}

	hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
	if (hcd->regs == NULL) {
		dev_dbg(&pdev->dev, "error mapping memory\n");
		ret = -ENXIO;
		goto fail_ioremap;
	}

	priv = kmalloc(sizeof(struct ehci_sh_priv), GFP_KERNEL);
	if (!priv) {
		dev_dbg(&pdev->dev, "error allocating priv data\n");
		ret = -ENOMEM;
		goto fail_alloc;
	}

	/* These are optional, we don't care if they fail */
	priv->fclk = clk_get(&pdev->dev, "usb_fck");
	if (IS_ERR(priv->fclk))
		priv->fclk = NULL;

	priv->iclk = clk_get(&pdev->dev, "usb_ick");
	if (IS_ERR(priv->iclk))
		priv->iclk = NULL;

	clk_enable(priv->fclk);
	clk_enable(priv->iclk);

	if (pdata && pdata->phy_init)
		pdata->phy_init();

	ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
	if (ret != 0) {
		dev_err(&pdev->dev, "Failed to add hcd");
		goto fail_add_hcd;
	}

	priv->hcd = hcd;
	platform_set_drvdata(pdev, priv);

	return ret;

fail_add_hcd:
	clk_disable(priv->iclk);
	clk_disable(priv->fclk);

	clk_put(priv->iclk);
	clk_put(priv->fclk);

	kfree(priv);
fail_alloc:
	iounmap(hcd->regs);
fail_ioremap:
	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
fail_request_resource:
	usb_put_hcd(hcd);
fail_create_hcd:
	dev_err(&pdev->dev, "init %s fail, %d\n", dev_name(&pdev->dev), ret);

	return ret;
}

static int __exit ehci_hcd_sh_remove(struct platform_device *pdev)
{
	struct ehci_sh_priv *priv = platform_get_drvdata(pdev);
	struct usb_hcd *hcd = priv->hcd;

	usb_remove_hcd(hcd);
	iounmap(hcd->regs);
	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
	usb_put_hcd(hcd);
	platform_set_drvdata(pdev, NULL);

	clk_disable(priv->fclk);
	clk_disable(priv->iclk);

	clk_put(priv->fclk);
	clk_put(priv->iclk);

	kfree(priv);

	return 0;
}

static void ehci_hcd_sh_shutdown(struct platform_device *pdev)
{
	struct ehci_sh_priv *priv = platform_get_drvdata(pdev);
	struct usb_hcd *hcd = priv->hcd;

	if (hcd->driver->shutdown)
		hcd->driver->shutdown(hcd);
}

static struct platform_driver ehci_hcd_sh_driver = {
	.probe		= ehci_hcd_sh_probe,
	.remove		= __exit_p(ehci_hcd_sh_remove),
	.shutdown	= ehci_hcd_sh_shutdown,
	.driver		= {
		.name	= "sh_ehci",
		.owner	= THIS_MODULE,
	},
};

MODULE_ALIAS("platform:sh_ehci");