ehci-ath79.c revision 502fa84195f47a79d7220470ebaa85a773659755 
1/*
2 *  Bus Glue for Atheros AR7XXX/AR9XXX built-in EHCI controller.
3 *
4 *  Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
5 *  Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
6 *
7 *  Parts of this file are based on Atheros' 2.6.15 BSP
8 *	Copyright (C) 2007 Atheros Communications, Inc.
9 *
10 *  This program is free software; you can redistribute it and/or modify it
11 *  under the terms of the GNU General Public License version 2 as published
12 *  by the Free Software Foundation.
13 */
14
15#include <linux/platform_device.h>
16
17enum {
18	EHCI_ATH79_IP_V1 = 0,
19	EHCI_ATH79_IP_V2,
20};
21
22static const struct platform_device_id ehci_ath79_id_table[] = {
23	{
24		.name		= "ar71xx-ehci",
25		.driver_data	= EHCI_ATH79_IP_V1,
26	},
27	{
28		.name		= "ar724x-ehci",
29		.driver_data	= EHCI_ATH79_IP_V2,
30	},
31	{
32		.name		= "ar913x-ehci",
33		.driver_data	= EHCI_ATH79_IP_V2,
34	},
35	{
36		/* terminating entry */
37	},
38};
39
40MODULE_DEVICE_TABLE(platform, ehci_ath79_id_table);
41
42static int ehci_ath79_init(struct usb_hcd *hcd)
43{
44	struct ehci_hcd *ehci = hcd_to_ehci(hcd);
45	struct platform_device *pdev = to_platform_device(hcd->self.controller);
46	const struct platform_device_id *id;
47	int ret;
48
49	id = platform_get_device_id(pdev);
50	if (!id) {
51		dev_err(hcd->self.controller, "missing device id\n");
52		return -EINVAL;
53	}
54
55	switch (id->driver_data) {
56	case EHCI_ATH79_IP_V1:
57		ehci->caps = hcd->regs;
58		ehci->regs = hcd->regs +
59			HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
60		break;
61
62	case EHCI_ATH79_IP_V2:
63		hcd->has_tt = 1;
64
65		ehci->caps = hcd->regs + 0x100;
66		ehci->regs = hcd->regs + 0x100 +
67			HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
68		break;
69
70	default:
71		BUG();
72	}
73
74	dbg_hcs_params(ehci, "reset");
75	dbg_hcc_params(ehci, "reset");
76	ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
77	ehci->sbrn = 0x20;
78
79	ehci_reset(ehci);
80
81	ret = ehci_init(hcd);
82	if (ret)
83		return ret;
84
85	ehci_port_power(ehci, 0);
86
87	return 0;
88}
89
90static const struct hc_driver ehci_ath79_hc_driver = {
91	.description		= hcd_name,
92	.product_desc		= "Atheros built-in EHCI controller",
93	.hcd_priv_size		= sizeof(struct ehci_hcd),
94	.irq			= ehci_irq,
95	.flags			= HCD_MEMORY | HCD_USB2,
96
97	.reset			= ehci_ath79_init,
98	.start			= ehci_run,
99	.stop			= ehci_stop,
100	.shutdown		= ehci_shutdown,
101
102	.urb_enqueue		= ehci_urb_enqueue,
103	.urb_dequeue		= ehci_urb_dequeue,
104	.endpoint_disable	= ehci_endpoint_disable,
105	.endpoint_reset		= ehci_endpoint_reset,
106
107	.get_frame_number	= ehci_get_frame,
108
109	.hub_status_data	= ehci_hub_status_data,
110	.hub_control		= ehci_hub_control,
111
112	.relinquish_port	= ehci_relinquish_port,
113	.port_handed_over	= ehci_port_handed_over,
114
115	.clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
116};
117
118static int ehci_ath79_probe(struct platform_device *pdev)
119{
120	struct usb_hcd *hcd;
121	struct resource *res;
122	int irq;
123	int ret;
124
125	if (usb_disabled())
126		return -ENODEV;
127
128	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
129	if (!res) {
130		dev_dbg(&pdev->dev, "no IRQ specified\n");
131		return -ENODEV;
132	}
133	irq = res->start;
134
135	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
136	if (!res) {
137		dev_dbg(&pdev->dev, "no base address specified\n");
138		return -ENODEV;
139	}
140
141	hcd = usb_create_hcd(&ehci_ath79_hc_driver, &pdev->dev,
142			     dev_name(&pdev->dev));
143	if (!hcd)
144		return -ENOMEM;
145
146	hcd->rsrc_start	= res->start;
147	hcd->rsrc_len	= res->end - res->start + 1;
148
149	if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
150		dev_dbg(&pdev->dev, "controller already in use\n");
151		ret = -EBUSY;
152		goto err_put_hcd;
153	}
154
155	hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
156	if (!hcd->regs) {
157		dev_dbg(&pdev->dev, "error mapping memory\n");
158		ret = -EFAULT;
159		goto err_release_region;
160	}
161
162	ret = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED);
163	if (ret)
164		goto err_iounmap;
165
166	return 0;
167
168err_iounmap:
169	iounmap(hcd->regs);
170
171err_release_region:
172	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
173err_put_hcd:
174	usb_put_hcd(hcd);
175	return ret;
176}
177
178static int ehci_ath79_remove(struct platform_device *pdev)
179{
180	struct usb_hcd *hcd = platform_get_drvdata(pdev);
181
182	usb_remove_hcd(hcd);
183	iounmap(hcd->regs);
184	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
185	usb_put_hcd(hcd);
186
187	return 0;
188}
189
190static struct platform_driver ehci_ath79_driver = {
191	.probe		= ehci_ath79_probe,
192	.remove		= ehci_ath79_remove,
193	.id_table	= ehci_ath79_id_table,
194	.driver = {
195		.owner	= THIS_MODULE,
196		.name	= "ath79-ehci",
197	}
198};
199
200MODULE_ALIAS(PLATFORM_MODULE_PREFIX "ath79-ehci");
201