1 /*
2 * linux/driver/usb/host/ehci-w90x900.c
3 *
4 * Copyright (c) 2008 Nuvoton technology corporation.
5 *
6 * Wan ZongShun <mcuos.com@gmail.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation;version 2 of the License.
11 *
12 */
13
14 #include <linux/dma-mapping.h>
15 #include <linux/io.h>
16 #include <linux/kernel.h>
17 #include <linux/module.h>
18 #include <linux/of.h>
19 #include <linux/platform_device.h>
20 #include <linux/usb.h>
21 #include <linux/usb/hcd.h>
22
23 #include "ehci.h"
24
25 /* enable phy0 and phy1 for w90p910 */
26 #define ENPHY (0x01<<8)
27 #define PHY0_CTR (0xA4)
28 #define PHY1_CTR (0xA8)
29
30 #define DRIVER_DESC "EHCI w90x900 driver"
31
32 static const char hcd_name[] = "ehci-w90x900 ";
33
34 static struct hc_driver __read_mostly ehci_w90x900_hc_driver;
35
usb_w90x900_probe(const struct hc_driver * driver,struct platform_device * pdev)36 static int usb_w90x900_probe(const struct hc_driver *driver,
37 struct platform_device *pdev)
38 {
39 struct usb_hcd *hcd;
40 struct ehci_hcd *ehci;
41 struct resource *res;
42 int retval = 0, irq;
43 unsigned long val;
44
45 hcd = usb_create_hcd(driver, &pdev->dev, "w90x900 EHCI");
46 if (!hcd) {
47 retval = -ENOMEM;
48 goto err1;
49 }
50
51 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
52 hcd->regs = devm_ioremap_resource(&pdev->dev, res);
53 if (IS_ERR(hcd->regs)) {
54 retval = PTR_ERR(hcd->regs);
55 goto err2;
56 }
57 hcd->rsrc_start = res->start;
58 hcd->rsrc_len = resource_size(res);
59
60 ehci = hcd_to_ehci(hcd);
61 ehci->caps = hcd->regs;
62 ehci->regs = hcd->regs +
63 HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
64
65 /* enable PHY 0,1,the regs only apply to w90p910
66 * 0xA4,0xA8 were offsets of PHY0 and PHY1 controller of
67 * w90p910 IC relative to ehci->regs.
68 */
69 val = __raw_readl(ehci->regs+PHY0_CTR);
70 val |= ENPHY;
71 __raw_writel(val, ehci->regs+PHY0_CTR);
72
73 val = __raw_readl(ehci->regs+PHY1_CTR);
74 val |= ENPHY;
75 __raw_writel(val, ehci->regs+PHY1_CTR);
76
77 irq = platform_get_irq(pdev, 0);
78 if (irq < 0) {
79 retval = irq;
80 goto err2;
81 }
82
83 retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
84 if (retval != 0)
85 goto err2;
86
87 device_wakeup_enable(hcd->self.controller);
88 return retval;
89 err2:
90 usb_put_hcd(hcd);
91 err1:
92 return retval;
93 }
94
usb_w90x900_remove(struct usb_hcd * hcd,struct platform_device * pdev)95 static void usb_w90x900_remove(struct usb_hcd *hcd,
96 struct platform_device *pdev)
97 {
98 usb_remove_hcd(hcd);
99 usb_put_hcd(hcd);
100 }
101
ehci_w90x900_probe(struct platform_device * pdev)102 static int ehci_w90x900_probe(struct platform_device *pdev)
103 {
104 if (usb_disabled())
105 return -ENODEV;
106
107 return usb_w90x900_probe(&ehci_w90x900_hc_driver, pdev);
108 }
109
ehci_w90x900_remove(struct platform_device * pdev)110 static int ehci_w90x900_remove(struct platform_device *pdev)
111 {
112 struct usb_hcd *hcd = platform_get_drvdata(pdev);
113
114 usb_w90x900_remove(hcd, pdev);
115
116 return 0;
117 }
118
119 static struct platform_driver ehci_hcd_w90x900_driver = {
120 .probe = ehci_w90x900_probe,
121 .remove = ehci_w90x900_remove,
122 .driver = {
123 .name = "w90x900-ehci",
124 },
125 };
126
ehci_w90X900_init(void)127 static int __init ehci_w90X900_init(void)
128 {
129 if (usb_disabled())
130 return -ENODEV;
131
132 pr_info("%s: " DRIVER_DESC "\n", hcd_name);
133
134 ehci_init_driver(&ehci_w90x900_hc_driver, NULL);
135 return platform_driver_register(&ehci_hcd_w90x900_driver);
136 }
137 module_init(ehci_w90X900_init);
138
ehci_w90X900_cleanup(void)139 static void __exit ehci_w90X900_cleanup(void)
140 {
141 platform_driver_unregister(&ehci_hcd_w90x900_driver);
142 }
143 module_exit(ehci_w90X900_cleanup);
144
145 MODULE_DESCRIPTION(DRIVER_DESC);
146 MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
147 MODULE_ALIAS("platform:w90p910-ehci");
148 MODULE_LICENSE("GPL v2");
149