1 /*
2 * Bus Glue for Loongson LS1X built-in EHCI controller.
3 *
4 * Copyright (c) 2012 Zhang, Keguang <keguang.zhang@gmail.com>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published
8 * by the Free Software Foundation.
9 */
10
11
12 #include <linux/platform_device.h>
13
ehci_ls1x_reset(struct usb_hcd * hcd)14 static int ehci_ls1x_reset(struct usb_hcd *hcd)
15 {
16 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
17 int ret;
18
19 ehci->caps = hcd->regs;
20
21 ret = ehci_setup(hcd);
22 if (ret)
23 return ret;
24
25 ehci_port_power(ehci, 0);
26
27 return 0;
28 }
29
30 static const struct hc_driver ehci_ls1x_hc_driver = {
31 .description = hcd_name,
32 .product_desc = "LOONGSON1 EHCI",
33 .hcd_priv_size = sizeof(struct ehci_hcd),
34
35 /*
36 * generic hardware linkage
37 */
38 .irq = ehci_irq,
39 .flags = HCD_MEMORY | HCD_USB2,
40
41 /*
42 * basic lifecycle operations
43 */
44 .reset = ehci_ls1x_reset,
45 .start = ehci_run,
46 .stop = ehci_stop,
47 .shutdown = ehci_shutdown,
48
49 /*
50 * managing i/o requests and associated device resources
51 */
52 .urb_enqueue = ehci_urb_enqueue,
53 .urb_dequeue = ehci_urb_dequeue,
54 .endpoint_disable = ehci_endpoint_disable,
55 .endpoint_reset = ehci_endpoint_reset,
56
57 /*
58 * scheduling support
59 */
60 .get_frame_number = ehci_get_frame,
61
62 /*
63 * root hub support
64 */
65 .hub_status_data = ehci_hub_status_data,
66 .hub_control = ehci_hub_control,
67 .relinquish_port = ehci_relinquish_port,
68 .port_handed_over = ehci_port_handed_over,
69
70 .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
71 };
72
ehci_hcd_ls1x_probe(struct platform_device * pdev)73 static int ehci_hcd_ls1x_probe(struct platform_device *pdev)
74 {
75 struct usb_hcd *hcd;
76 struct resource *res;
77 int irq;
78 int ret;
79
80 pr_debug("initializing loongson1 ehci USB Controller\n");
81
82 if (usb_disabled())
83 return -ENODEV;
84
85 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
86 if (!res) {
87 dev_err(&pdev->dev,
88 "Found HC with no IRQ. Check %s setup!\n",
89 dev_name(&pdev->dev));
90 return -ENODEV;
91 }
92 irq = res->start;
93
94 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
95 if (!res) {
96 dev_err(&pdev->dev,
97 "Found HC with no register addr. Check %s setup!\n",
98 dev_name(&pdev->dev));
99 return -ENODEV;
100 }
101
102 hcd = usb_create_hcd(&ehci_ls1x_hc_driver, &pdev->dev,
103 dev_name(&pdev->dev));
104 if (!hcd)
105 return -ENOMEM;
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 dev_dbg(&pdev->dev, "controller already in use\n");
111 ret = -EBUSY;
112 goto err_put_hcd;
113 }
114
115 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
116 if (hcd->regs == NULL) {
117 dev_dbg(&pdev->dev, "error mapping memory\n");
118 ret = -EFAULT;
119 goto err_release_region;
120 }
121
122 ret = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED);
123 if (ret)
124 goto err_iounmap;
125
126 return ret;
127
128 err_iounmap:
129 iounmap(hcd->regs);
130 err_release_region:
131 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
132 err_put_hcd:
133 usb_put_hcd(hcd);
134 return ret;
135 }
136
ehci_hcd_ls1x_remove(struct platform_device * pdev)137 static int ehci_hcd_ls1x_remove(struct platform_device *pdev)
138 {
139 struct usb_hcd *hcd = platform_get_drvdata(pdev);
140
141 usb_remove_hcd(hcd);
142 iounmap(hcd->regs);
143 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
144 usb_put_hcd(hcd);
145
146 return 0;
147 }
148
149 static struct platform_driver ehci_ls1x_driver = {
150 .probe = ehci_hcd_ls1x_probe,
151 .remove = ehci_hcd_ls1x_remove,
152 .shutdown = usb_hcd_platform_shutdown,
153 .driver = {
154 .name = "ls1x-ehci",
155 .owner = THIS_MODULE,
156 },
157 };
158
159 MODULE_ALIAS(PLATFORM_MODULE_PREFIX "ls1x-ehci");
160