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->has_synopsys_hc_bug = 1;
 58
 59		ehci->caps = hcd->regs;
 60		ehci->regs = hcd->regs +
 61			HC_LENGTH(ehci,
 62				  ehci_readl(ehci, &ehci->caps->hc_capbase));
 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 +
 70			HC_LENGTH(ehci,
 71				  ehci_readl(ehci, &ehci->caps->hc_capbase));
 72		break;
 73
 74	default:
 75		BUG();
 76	}
 77
 78	dbg_hcs_params(ehci, "reset");
 79	dbg_hcc_params(ehci, "reset");
 80	ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
 81	ehci->sbrn = 0x20;
 82
 83	ehci_reset(ehci);
 84
 85	ret = ehci_init(hcd);
 86	if (ret)
 87		return ret;
 88
 89	ehci_port_power(ehci, 0);
 90
 91	return 0;
 92}
 93
 94static const struct hc_driver ehci_ath79_hc_driver = {
 95	.description		= hcd_name,
 96	.product_desc		= "Atheros built-in EHCI controller",
 97	.hcd_priv_size		= sizeof(struct ehci_hcd),
 98	.irq			= ehci_irq,
 99	.flags			= HCD_MEMORY | HCD_USB2,
100
101	.reset			= ehci_ath79_init,
102	.start			= ehci_run,
103	.stop			= ehci_stop,
104	.shutdown		= ehci_shutdown,
105
106	.urb_enqueue		= ehci_urb_enqueue,
107	.urb_dequeue		= ehci_urb_dequeue,
108	.endpoint_disable	= ehci_endpoint_disable,
109	.endpoint_reset		= ehci_endpoint_reset,
110
111	.get_frame_number	= ehci_get_frame,
112
113	.hub_status_data	= ehci_hub_status_data,
114	.hub_control		= ehci_hub_control,
115
116	.relinquish_port	= ehci_relinquish_port,
117	.port_handed_over	= ehci_port_handed_over,
118
119	.clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
120};
121
122static int ehci_ath79_probe(struct platform_device *pdev)
123{
124	struct usb_hcd *hcd;
125	struct resource *res;
126	int irq;
127	int ret;
128
129	if (usb_disabled())
130		return -ENODEV;
131
132	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
133	if (!res) {
134		dev_dbg(&pdev->dev, "no IRQ specified\n");
135		return -ENODEV;
136	}
137	irq = res->start;
138
139	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
140	if (!res) {
141		dev_dbg(&pdev->dev, "no base address specified\n");
142		return -ENODEV;
143	}
144
145	hcd = usb_create_hcd(&ehci_ath79_hc_driver, &pdev->dev,
146			     dev_name(&pdev->dev));
147	if (!hcd)
148		return -ENOMEM;
149
150	hcd->rsrc_start	= res->start;
151	hcd->rsrc_len	= resource_size(res);
152
153	if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
154		dev_dbg(&pdev->dev, "controller already in use\n");
155		ret = -EBUSY;
156		goto err_put_hcd;
157	}
158
159	hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
160	if (!hcd->regs) {
161		dev_dbg(&pdev->dev, "error mapping memory\n");
162		ret = -EFAULT;
163		goto err_release_region;
164	}
165
166	ret = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED);
167	if (ret)
168		goto err_iounmap;
169
170	return 0;
171
172err_iounmap:
173	iounmap(hcd->regs);
174
175err_release_region:
176	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
177err_put_hcd:
178	usb_put_hcd(hcd);
179	return ret;
180}
181
182static int ehci_ath79_remove(struct platform_device *pdev)
183{
184	struct usb_hcd *hcd = platform_get_drvdata(pdev);
185
186	usb_remove_hcd(hcd);
187	iounmap(hcd->regs);
188	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
189	usb_put_hcd(hcd);
190
191	return 0;
192}
193
194static struct platform_driver ehci_ath79_driver = {
195	.probe		= ehci_ath79_probe,
196	.remove		= ehci_ath79_remove,
197	.id_table	= ehci_ath79_id_table,
198	.driver = {
199		.owner	= THIS_MODULE,
200		.name	= "ath79-ehci",
201	}
202};
203
204MODULE_ALIAS(PLATFORM_MODULE_PREFIX "ath79-ehci");