ramips: merge 3.2 fixes
[openwrt/svn-archive/archive.git] / target / linux / ramips / files / drivers / usb / host / ehci-rt3883.c
1 /*
2 * Bus Glue for the built-in EHCI controller of the Ralink RT3662/RT3883 SoCs
3 *
4 * Copyright (C) 2011-2012 Gabor Juhos <juhosg@openwrt.org>
5 *
6 * Parts of this file are based on Ralink's 2.6.21 BSP
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License version 2 as published
10 * by the Free Software Foundation.
11 */
12
13 #include <linux/platform_device.h>
14 #include <asm/mach-ralink/rt3883.h>
15 #include <asm/mach-ralink/rt3883_ehci_platform.h>
16
17 static int ehci_rt3883_init(struct usb_hcd *hcd)
18 {
19 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
20 int ret;
21
22 ehci->caps = hcd->regs;
23 ehci->regs = hcd->regs +
24 HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
25 dbg_hcs_params(ehci, "reset");
26 dbg_hcc_params(ehci, "reset");
27
28 ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
29 ehci->sbrn = 0x20;
30
31 ehci_reset(ehci);
32
33 ret = ehci_init(hcd);
34 if (ret)
35 return ret;
36
37 ehci_port_power(ehci, 0);
38
39 return 0;
40 }
41
42 static const struct hc_driver ehci_rt3883_hc_driver = {
43 .description = hcd_name,
44 .product_desc = "Ralink RT3883 built-in EHCI controller",
45 .hcd_priv_size = sizeof(struct ehci_hcd),
46 .irq = ehci_irq,
47 .flags = HCD_MEMORY | HCD_USB2,
48
49 .reset = ehci_rt3883_init,
50 .start = ehci_run,
51 .stop = ehci_stop,
52 .shutdown = ehci_shutdown,
53
54 .urb_enqueue = ehci_urb_enqueue,
55 .urb_dequeue = ehci_urb_dequeue,
56 .endpoint_disable = ehci_endpoint_disable,
57 .endpoint_reset = ehci_endpoint_reset,
58
59 .get_frame_number = ehci_get_frame,
60
61 .hub_status_data = ehci_hub_status_data,
62 .hub_control = ehci_hub_control,
63 .relinquish_port = ehci_relinquish_port,
64 .port_handed_over = ehci_port_handed_over,
65
66 .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
67 };
68
69 static int ehci_rt3883_probe(struct platform_device *pdev)
70 {
71 struct rt3883_ehci_platform_data *pdata;
72 struct usb_hcd *hcd;
73 struct resource *res;
74 int irq;
75 int ret;
76
77 if (usb_disabled())
78 return -ENODEV;
79
80 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
81 if (!res) {
82 dev_dbg(&pdev->dev, "no IRQ specified for %s\n",
83 dev_name(&pdev->dev));
84 return -ENODEV;
85 }
86 irq = res->start;
87
88 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
89 if (!res) {
90 dev_dbg(&pdev->dev, "no base address specified for %s\n",
91 dev_name(&pdev->dev));
92 return -ENODEV;
93 }
94
95 hcd = usb_create_hcd(&ehci_rt3883_hc_driver, &pdev->dev,
96 dev_name(&pdev->dev));
97 if (!hcd)
98 return -ENOMEM;
99
100 hcd->rsrc_start = res->start;
101 hcd->rsrc_len = res->end - res->start + 1;
102
103 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
104 dev_dbg(&pdev->dev, "controller already in use\n");
105 ret = -EBUSY;
106 goto err_put_hcd;
107 }
108
109 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
110 if (!hcd->regs) {
111 dev_dbg(&pdev->dev, "error mapping memory\n");
112 ret = -EFAULT;
113 goto err_release_region;
114 }
115
116 pdata = pdev->dev.platform_data;
117 if (pdata && pdata->start_hw)
118 pdata->start_hw();
119
120 ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
121 if (ret)
122 goto err_iounmap;
123
124 return 0;
125
126 err_iounmap:
127 iounmap(hcd->regs);
128
129 err_release_region:
130 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
131 err_put_hcd:
132 usb_put_hcd(hcd);
133 return ret;
134 }
135
136 static int ehci_rt3883_remove(struct platform_device *pdev)
137 {
138 struct usb_hcd *hcd = platform_get_drvdata(pdev);
139 struct rt3883_ehci_platform_data *pdata;
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 pdata = pdev->dev.platform_data;
147 if (pdata && pdata->stop_hw)
148 pdata->stop_hw();
149
150 return 0;
151 }
152
153 static struct platform_driver ehci_rt3883_driver = {
154 .probe = ehci_rt3883_probe,
155 .remove = ehci_rt3883_remove,
156 .driver = {
157 .owner = THIS_MODULE,
158 .name = "rt3883-ehci",
159 }
160 };
161
162 MODULE_ALIAS("platform:rt3883-ehci");