1/*
  2 * drivers/usb/host/ehci-vt8500.c
  3 *
  4 * Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
  5 *
  6 * Based on ehci-au1xxx.c
  7 *
  8 * This software is licensed under the terms of the GNU General Public
  9 * License version 2, as published by the Free Software Foundation, and
 10 * may be copied, distributed, and modified under those terms.
 11 *
 12 * This program is distributed in the hope that it will be useful,
 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 15 * GNU General Public License for more details.
 16 *
 17 */
 18
 19#include <linux/platform_device.h>
 20
 21static int ehci_update_device(struct usb_hcd *hcd, struct usb_device *udev)
 22{
 23	struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 24	int rc = 0;
 25
 26	if (!udev->parent) /* udev is root hub itself, impossible */
 27		rc = -1;
 28	/* we only support lpm device connected to root hub yet */
 29	if (ehci->has_lpm && !udev->parent->parent) {
 30		rc = ehci_lpm_set_da(ehci, udev->devnum, udev->portnum);
 31		if (!rc)
 32			rc = ehci_lpm_check(ehci, udev->portnum);
 33	}
 34	return rc;
 35}
 36
 37static const struct hc_driver vt8500_ehci_hc_driver = {
 38	.description		= hcd_name,
 39	.product_desc		= "VT8500 EHCI",
 40	.hcd_priv_size		= sizeof(struct ehci_hcd),
 41
 42	/*
 43	 * generic hardware linkage
 44	 */
 45	.irq			= ehci_irq,
 46	.flags			= HCD_MEMORY | HCD_USB2,
 47
 48	/*
 49	 * basic lifecycle operations
 50	 */
 51	.reset			= ehci_init,
 52	.start			= ehci_run,
 53	.stop			= ehci_stop,
 54	.shutdown		= ehci_shutdown,
 55
 56	/*
 57	 * managing i/o requests and associated device resources
 58	 */
 59	.urb_enqueue		= ehci_urb_enqueue,
 60	.urb_dequeue		= ehci_urb_dequeue,
 61	.endpoint_disable	= ehci_endpoint_disable,
 62	.endpoint_reset		= ehci_endpoint_reset,
 63
 64	/*
 65	 * scheduling support
 66	 */
 67	.get_frame_number	= ehci_get_frame,
 68
 69	/*
 70	 * root hub support
 71	 */
 72	.hub_status_data	= ehci_hub_status_data,
 73	.hub_control		= ehci_hub_control,
 74	.bus_suspend		= ehci_bus_suspend,
 75	.bus_resume		= ehci_bus_resume,
 76	.relinquish_port	= ehci_relinquish_port,
 77	.port_handed_over	= ehci_port_handed_over,
 78
 79	/*
 80	 * call back when device connected and addressed
 81	 */
 82	.update_device =	ehci_update_device,
 83
 84	.clear_tt_buffer_complete	= ehci_clear_tt_buffer_complete,
 85};
 86
 87static int vt8500_ehci_drv_probe(struct platform_device *pdev)
 88{
 89	struct usb_hcd *hcd;
 90	struct ehci_hcd *ehci;
 91	struct resource *res;
 92	int ret;
 93
 94	if (usb_disabled())
 95		return -ENODEV;
 96
 97	if (pdev->resource[1].flags != IORESOURCE_IRQ) {
 98		pr_debug("resource[1] is not IORESOURCE_IRQ");
 99		return -ENOMEM;
100	}
101	hcd = usb_create_hcd(&vt8500_ehci_hc_driver, &pdev->dev, "VT8500");
102	if (!hcd)
103		return -ENOMEM;
104
105	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
106	hcd->rsrc_start = res->start;
107	hcd->rsrc_len = resource_size(res);
108
109	if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
110		pr_debug("request_mem_region failed");
111		ret = -EBUSY;
112		goto err1;
113	}
114
115	hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
116	if (!hcd->regs) {
117		pr_debug("ioremap failed");
118		ret = -ENOMEM;
119		goto err2;
120	}
121
122	ehci = hcd_to_ehci(hcd);
123	ehci->caps = hcd->regs;
124	ehci->regs = hcd->regs +
125		HC_LENGTH(ehci, readl(&ehci->caps->hc_capbase));
126
127	dbg_hcs_params(ehci, "reset");
128	dbg_hcc_params(ehci, "reset");
129
130	/* cache this readonly data; minimize chip reads */
131	ehci->hcs_params = readl(&ehci->caps->hcs_params);
132
133	ehci_port_power(ehci, 1);
134
135	ret = usb_add_hcd(hcd, pdev->resource[1].start,
136			  IRQF_DISABLED | IRQF_SHARED);
137	if (ret == 0) {
138		platform_set_drvdata(pdev, hcd);
139		return ret;
140	}
141
142	iounmap(hcd->regs);
143err2:
144	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
145err1:
146	usb_put_hcd(hcd);
147	return ret;
148}
149
150static int vt8500_ehci_drv_remove(struct platform_device *pdev)
151{
152	struct usb_hcd *hcd = platform_get_drvdata(pdev);
153
154	usb_remove_hcd(hcd);
155	iounmap(hcd->regs);
156	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
157	usb_put_hcd(hcd);
158	platform_set_drvdata(pdev, NULL);
159
160	return 0;
161}
162
163static struct platform_driver vt8500_ehci_driver = {
164	.probe		= vt8500_ehci_drv_probe,
165	.remove		= vt8500_ehci_drv_remove,
166	.shutdown	= usb_hcd_platform_shutdown,
167	.driver = {
168		.name	= "vt8500-ehci",
169		.owner	= THIS_MODULE,
170	}
171};
172
173MODULE_ALIAS("platform:vt8500-ehci");