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1 office 1 /*
2 * MCS814X EHCI Host Controller Driver
3 *
4 * Based on "ehci-fsl.c" by Randy Vinson <rvinson@mvista.com>
5 *
6 * 2007 (c) MontaVista Software, Inc. This file is licensed under
7 * the terms of the GNU General Public License version 2. This program
8 * is licensed "as is" without any warranty of any kind, whether express
9 * or implied.
10 */
11  
12 #include <linux/platform_device.h>
13 #include <linux/of.h>
14  
15 #define MCS814X_EHCI_CAPS_OFFSET 0x68
16  
17 static int mcs814x_ehci_init(struct usb_hcd *hcd)
18 {
19 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
20 int retval = 0;
21  
22 ehci->caps = hcd->regs + MCS814X_EHCI_CAPS_OFFSET;
23 ehci->regs = hcd->regs
24 + HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
25 ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
26 ehci_reset(ehci);
27  
28 retval = ehci_init(hcd);
29 if (retval) {
30 pr_err("ehci_init failed\n");
31 return retval;
32 }
33  
34 return retval;
35 }
36  
37 static const struct hc_driver mcs814x_ehci_hc_driver = {
38 .description = hcd_name,
39 .product_desc = "MCS814X EHCI Host Controller",
40 .hcd_priv_size = sizeof(struct ehci_hcd),
41 .irq = ehci_irq,
42 .flags = HCD_MEMORY | HCD_USB2,
43 .reset = mcs814x_ehci_init,
44 .start = ehci_run,
45 .stop = ehci_stop,
46 .shutdown = ehci_shutdown,
47 .urb_enqueue = ehci_urb_enqueue,
48 .urb_dequeue = ehci_urb_dequeue,
49 .endpoint_disable = ehci_endpoint_disable,
50 .get_frame_number = ehci_get_frame,
51 .hub_status_data = ehci_hub_status_data,
52 .hub_control = ehci_hub_control,
53 #if defined(CONFIG_PM)
54 .bus_suspend = ehci_bus_suspend,
55 .bus_resume = ehci_bus_resume,
56 #endif
57 .relinquish_port = ehci_relinquish_port,
58 .port_handed_over = ehci_port_handed_over,
59  
60 .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
61 };
62  
63 static int mcs814x_ehci_probe(struct platform_device *pdev)
64 {
65 struct usb_hcd *hcd;
66 const struct hc_driver *driver = &mcs814x_ehci_hc_driver;
67 struct resource *res;
68 int irq;
69 int retval;
70  
71 if (usb_disabled())
72 return -ENODEV;
73  
74 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
75 if (!res) {
76 dev_err(&pdev->dev,
77 "Found HC with no IRQ. Check %s setup!\n",
78 dev_name(&pdev->dev));
79 return -ENODEV;
80 }
81 irq = res->start;
82  
83 pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
84 pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
85  
86 hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
87 if (!hcd) {
88 retval = -ENOMEM;
89 goto fail_create_hcd;
90 }
91  
92 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
93 if (!res) {
94 dev_err(&pdev->dev,
95 "Found HC with no register addr. Check %s setup!\n",
96 dev_name(&pdev->dev));
97 retval = -ENODEV;
98 goto fail_request_resource;
99 }
100 hcd->rsrc_start = res->start;
101 hcd->rsrc_len = resource_size(res);
102  
103 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
104 driver->description)) {
105 dev_dbg(&pdev->dev, "controller already in use\n");
106 retval = -EBUSY;
107 goto fail_request_resource;
108 }
109  
110 hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
111 if (hcd->regs == NULL) {
112 dev_dbg(&pdev->dev, "error mapping memory\n");
113 retval = -EFAULT;
114 goto fail_ioremap;
115 }
116  
117 retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
118 if (retval)
119 goto fail_add_hcd;
120  
121 dev_info(&pdev->dev, "added MCS814X EHCI driver\n");
122  
123 return retval;
124  
125 fail_add_hcd:
126 iounmap(hcd->regs);
127 fail_ioremap:
128 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
129 fail_request_resource:
130 usb_put_hcd(hcd);
131 fail_create_hcd:
132 dev_err(&pdev->dev, "init %s fail, %d\n", dev_name(&pdev->dev), retval);
133 return retval;
134 }
135  
136 static int mcs814x_ehci_remove(struct platform_device *pdev)
137 {
138 struct usb_hcd *hcd = platform_get_drvdata(pdev);
139  
140 usb_remove_hcd(hcd);
141 iounmap(hcd->regs);
142 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
143 usb_put_hcd(hcd);
144  
145 return 0;
146 }
147  
148 MODULE_ALIAS("platform:mcs814x-ehci");
149  
150 static const struct of_device_id mcs814x_ehci_id[] = {
151 { .compatible = "moschip,mcs814x-ehci" },
152 { .compatible = "usb-ehci" },
153 { /* sentinel */ },
154 };
155  
156 static struct platform_driver mcs814x_ehci_driver = {
157 .probe = mcs814x_ehci_probe,
158 .remove = mcs814x_ehci_remove,
159 .driver = {
160 .name = "mcs814x-ehci",
161 .of_match_table = mcs814x_ehci_id,
162 },
163 };