tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * SAMSUNG S5P USB HOST EHCI Controller
3 *
4 * Copyright (C) 2011 Samsung Electronics Co.Ltd
5 * Author: Jingoo Han <jg1.han@samsung.com>
6 * Author: Joonyoung Shim <jy0922.shim@samsung.com>
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 as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 *
13 */
14
15#include <linux/clk.h>
16#include <linux/platform_device.h>
17#include <mach/regs-pmu.h>
18#include <plat/cpu.h>
19#include <plat/ehci.h>
20#include <plat/usb-phy.h>
21
22struct s5p_ehci_hcd {
23 struct device *dev;
24 struct usb_hcd *hcd;
25 struct clk *clk;
26};
27
28static const struct hc_driver s5p_ehci_hc_driver = {
29 .description = hcd_name,
30 .product_desc = "S5P EHCI Host Controller",
31 .hcd_priv_size = sizeof(struct ehci_hcd),
32
33 .irq = ehci_irq,
34 .flags = HCD_MEMORY | HCD_USB2,
35
36 .reset = ehci_init,
37 .start = ehci_run,
38 .stop = ehci_stop,
39 .shutdown = ehci_shutdown,
40
41 .get_frame_number = ehci_get_frame,
42
43 .urb_enqueue = ehci_urb_enqueue,
44 .urb_dequeue = ehci_urb_dequeue,
45 .endpoint_disable = ehci_endpoint_disable,
46 .endpoint_reset = ehci_endpoint_reset,
47
48 .hub_status_data = ehci_hub_status_data,
49 .hub_control = ehci_hub_control,
50 .bus_suspend = ehci_bus_suspend,
51 .bus_resume = ehci_bus_resume,
52
53 .relinquish_port = ehci_relinquish_port,
54 .port_handed_over = ehci_port_handed_over,
55
56 .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
57};
58
59static int __devinit s5p_ehci_probe(struct platform_device *pdev)
60{
61 struct s5p_ehci_platdata *pdata;
62 struct s5p_ehci_hcd *s5p_ehci;
63 struct usb_hcd *hcd;
64 struct ehci_hcd *ehci;
65 struct resource *res;
66 int irq;
67 int err;
68
69 pdata = pdev->dev.platform_data;
70 if (!pdata) {
71 dev_err(&pdev->dev, "No platform data defined\n");
72 return -EINVAL;
73 }
74
75 s5p_ehci = kzalloc(sizeof(struct s5p_ehci_hcd), GFP_KERNEL);
76 if (!s5p_ehci)
77 return -ENOMEM;
78
79 s5p_ehci->dev = &pdev->dev;
80
81 hcd = usb_create_hcd(&s5p_ehci_hc_driver, &pdev->dev,
82 dev_name(&pdev->dev));
83 if (!hcd) {
84 dev_err(&pdev->dev, "Unable to create HCD\n");
85 err = -ENOMEM;
86 goto fail_hcd;
87 }
88
89 s5p_ehci->clk = clk_get(&pdev->dev, "usbhost");
90
91 if (IS_ERR(s5p_ehci->clk)) {
92 dev_err(&pdev->dev, "Failed to get usbhost clock\n");
93 err = PTR_ERR(s5p_ehci->clk);
94 goto fail_clk;
95 }
96
97 err = clk_enable(s5p_ehci->clk);
98 if (err)
99 goto fail_clken;
100
101 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
102 if (!res) {
103 dev_err(&pdev->dev, "Failed to get I/O memory\n");
104 err = -ENXIO;
105 goto fail_io;
106 }
107
108 hcd->rsrc_start = res->start;
109 hcd->rsrc_len = resource_size(res);
110 hcd->regs = ioremap(res->start, resource_size(res));
111 if (!hcd->regs) {
112 dev_err(&pdev->dev, "Failed to remap I/O memory\n");
113 err = -ENOMEM;
114 goto fail_io;
115 }
116
117 irq = platform_get_irq(pdev, 0);
118 if (!irq) {
119 dev_err(&pdev->dev, "Failed to get IRQ\n");
120 err = -ENODEV;
121 goto fail;
122 }
123
124 if (pdata->phy_init)
125 pdata->phy_init(pdev, S5P_USB_PHY_HOST);
126
127 ehci = hcd_to_ehci(hcd);
128 ehci->caps = hcd->regs;
129 ehci->regs = hcd->regs +
130 HC_LENGTH(ehci, readl(&ehci->caps->hc_capbase));
131
132 dbg_hcs_params(ehci, "reset");
133 dbg_hcc_params(ehci, "reset");
134
135 /* cache this readonly data; minimize chip reads */
136 ehci->hcs_params = readl(&ehci->caps->hcs_params);
137
138 err = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED);
139 if (err) {
140 dev_err(&pdev->dev, "Failed to add USB HCD\n");
141 goto fail;
142 }
143
144 platform_set_drvdata(pdev, s5p_ehci);
145
146 return 0;
147
148fail:
149 iounmap(hcd->regs);
150fail_io:
151 clk_disable(s5p_ehci->clk);
152fail_clken:
153 clk_put(s5p_ehci->clk);
154fail_clk:
155 usb_put_hcd(hcd);
156fail_hcd:
157 kfree(s5p_ehci);
158 return err;
159}
160
161static int __devexit s5p_ehci_remove(struct platform_device *pdev)
162{
163 struct s5p_ehci_platdata *pdata = pdev->dev.platform_data;
164 struct s5p_ehci_hcd *s5p_ehci = platform_get_drvdata(pdev);
165 struct usb_hcd *hcd = s5p_ehci->hcd;
166
167 usb_remove_hcd(hcd);
168
169 if (pdata && pdata->phy_exit)
170 pdata->phy_exit(pdev, S5P_USB_PHY_HOST);
171
172 iounmap(hcd->regs);
173
174 clk_disable(s5p_ehci->clk);
175 clk_put(s5p_ehci->clk);
176
177 usb_put_hcd(hcd);
178 kfree(s5p_ehci);
179
180 return 0;
181}
182
183static void s5p_ehci_shutdown(struct platform_device *pdev)
184{
185 struct s5p_ehci_hcd *s5p_ehci = platform_get_drvdata(pdev);
186 struct usb_hcd *hcd = s5p_ehci->hcd;
187
188 if (hcd->driver->shutdown)
189 hcd->driver->shutdown(hcd);
190}
191
192static struct platform_driver s5p_ehci_driver = {
193 .probe = s5p_ehci_probe,
194 .remove = __devexit_p(s5p_ehci_remove),
195 .shutdown = s5p_ehci_shutdown,
196 .driver = {
197 .name = "s5p-ehci",
198 .owner = THIS_MODULE,
199 }
200};
201
202MODULE_ALIAS("platform:s5p-ehci");