ehci-ath79.c revision 28f65c11f2ffb3957259dece647a24f8ad2e241b 
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 hclength;
48	int ret;
49
50	id = platform_get_device_id(pdev);
51	if (!id) {
52		dev_err(hcd->self.controller, "missing device id\n");
53		return -EINVAL;
54	}
55
56	hclength = HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
57	switch (id->driver_data) {
58	case EHCI_ATH79_IP_V1:
59		ehci->has_synopsys_hc_bug = 1;
60
61		ehci->caps = hcd->regs;
62		ehci->regs = hcd->regs + hclength;
63		break;
64
65	case EHCI_ATH79_IP_V2:
66		hcd->has_tt = 1;
67
68		ehci->caps = hcd->regs + 0x100;
69		ehci->regs = hcd->regs + 0x100 + hclength;
70		break;
71
72	default:
73		BUG();
74	}
75
76	dbg_hcs_params(ehci, "reset");
77	dbg_hcc_params(ehci, "reset");
78	ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
79	ehci->sbrn = 0x20;
80
81	ehci_reset(ehci);
82
83	ret = ehci_init(hcd);
84	if (ret)
85		return ret;
86
87	ehci_port_power(ehci, 0);
88
89	return 0;
90}
91
92static const struct hc_driver ehci_ath79_hc_driver = {
93	.description		= hcd_name,
94	.product_desc		= "Atheros built-in EHCI controller",
95	.hcd_priv_size		= sizeof(struct ehci_hcd),
96	.irq			= ehci_irq,
97	.flags			= HCD_MEMORY | HCD_USB2,
98
99	.reset			= ehci_ath79_init,
100	.start			= ehci_run,
101	.stop			= ehci_stop,
102	.shutdown		= ehci_shutdown,
103
104	.urb_enqueue		= ehci_urb_enqueue,
105	.urb_dequeue		= ehci_urb_dequeue,
106	.endpoint_disable	= ehci_endpoint_disable,
107	.endpoint_reset		= ehci_endpoint_reset,
108
109	.get_frame_number	= ehci_get_frame,
110
111	.hub_status_data	= ehci_hub_status_data,
112	.hub_control		= ehci_hub_control,
113
114	.relinquish_port	= ehci_relinquish_port,
115	.port_handed_over	= ehci_port_handed_over,
116
117	.clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
118};
119
120static int ehci_ath79_probe(struct platform_device *pdev)
121{
122	struct usb_hcd *hcd;
123	struct resource *res;
124	int irq;
125	int ret;
126
127	if (usb_disabled())
128		return -ENODEV;
129
130	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
131	if (!res) {
132		dev_dbg(&pdev->dev, "no IRQ specified\n");
133		return -ENODEV;
134	}
135	irq = res->start;
136
137	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
138	if (!res) {
139		dev_dbg(&pdev->dev, "no base address specified\n");
140		return -ENODEV;
141	}
142
143	hcd = usb_create_hcd(&ehci_ath79_hc_driver, &pdev->dev,
144			     dev_name(&pdev->dev));
145	if (!hcd)
146		return -ENOMEM;
147
148	hcd->rsrc_start	= res->start;
149	hcd->rsrc_len	= resource_size(res);
150
151	if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
152		dev_dbg(&pdev->dev, "controller already in use\n");
153		ret = -EBUSY;
154		goto err_put_hcd;
155	}
156
157	hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
158	if (!hcd->regs) {
159		dev_dbg(&pdev->dev, "error mapping memory\n");
160		ret = -EFAULT;
161		goto err_release_region;
162	}
163
164	ret = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED);
165	if (ret)
166		goto err_iounmap;
167
168	return 0;
169
170err_iounmap:
171	iounmap(hcd->regs);
172
173err_release_region:
174	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
175err_put_hcd:
176	usb_put_hcd(hcd);
177	return ret;
178}
179
180static int ehci_ath79_remove(struct platform_device *pdev)
181{
182	struct usb_hcd *hcd = platform_get_drvdata(pdev);
183
184	usb_remove_hcd(hcd);
185	iounmap(hcd->regs);
186	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
187	usb_put_hcd(hcd);
188
189	return 0;
190}
191
192static struct platform_driver ehci_ath79_driver = {
193	.probe		= ehci_ath79_probe,
194	.remove		= ehci_ath79_remove,
195	.id_table	= ehci_ath79_id_table,
196	.driver = {
197		.owner	= THIS_MODULE,
198		.name	= "ath79-ehci",
199	}
200};
201
202MODULE_ALIAS(PLATFORM_MODULE_PREFIX "ath79-ehci");
203