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11#include <linux/clk.h>
12#include <linux/dma-mapping.h>
13#include <linux/io.h>
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/of.h>
17#include <linux/platform_device.h>
18#include <linux/signal.h>
19#include <linux/usb.h>
20#include <linux/usb/hcd.h>
21
22#include "ohci.h"
23
24#define DRIVER_DESC "OHCI SPEAr driver"
25
26static const char hcd_name[] = "SPEAr-ohci";
27struct spear_ohci {
28 struct clk *clk;
29};
30
31#define to_spear_ohci(hcd) (struct spear_ohci *)(hcd_to_ohci(hcd)->priv)
32
33static struct hc_driver __read_mostly ohci_spear_hc_driver;
34
35static int spear_ohci_hcd_drv_probe(struct platform_device *pdev)
36{
37 const struct hc_driver *driver = &ohci_spear_hc_driver;
38 struct usb_hcd *hcd = NULL;
39 struct clk *usbh_clk;
40 struct spear_ohci *sohci_p;
41 struct resource *res;
42 int retval, irq;
43
44 irq = platform_get_irq(pdev, 0);
45 if (irq < 0) {
46 retval = irq;
47 goto fail;
48 }
49
50
51
52
53
54
55 retval = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
56 if (retval)
57 goto fail;
58
59 usbh_clk = devm_clk_get(&pdev->dev, NULL);
60 if (IS_ERR(usbh_clk)) {
61 dev_err(&pdev->dev, "Error getting interface clock\n");
62 retval = PTR_ERR(usbh_clk);
63 goto fail;
64 }
65
66 hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
67 if (!hcd) {
68 retval = -ENOMEM;
69 goto fail;
70 }
71
72 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
73 hcd->regs = devm_ioremap_resource(&pdev->dev, res);
74 if (IS_ERR(hcd->regs)) {
75 retval = PTR_ERR(hcd->regs);
76 goto err_put_hcd;
77 }
78
79 hcd->rsrc_start = pdev->resource[0].start;
80 hcd->rsrc_len = resource_size(res);
81
82 sohci_p = to_spear_ohci(hcd);
83 sohci_p->clk = usbh_clk;
84
85 clk_prepare_enable(sohci_p->clk);
86
87 retval = usb_add_hcd(hcd, irq, 0);
88 if (retval == 0) {
89 device_wakeup_enable(hcd->self.controller);
90 return retval;
91 }
92
93 clk_disable_unprepare(sohci_p->clk);
94err_put_hcd:
95 usb_put_hcd(hcd);
96fail:
97 dev_err(&pdev->dev, "init fail, %d\n", retval);
98
99 return retval;
100}
101
102static int spear_ohci_hcd_drv_remove(struct platform_device *pdev)
103{
104 struct usb_hcd *hcd = platform_get_drvdata(pdev);
105 struct spear_ohci *sohci_p = to_spear_ohci(hcd);
106
107 usb_remove_hcd(hcd);
108 if (sohci_p->clk)
109 clk_disable_unprepare(sohci_p->clk);
110
111 usb_put_hcd(hcd);
112 return 0;
113}
114
115#if defined(CONFIG_PM)
116static int spear_ohci_hcd_drv_suspend(struct platform_device *pdev,
117 pm_message_t message)
118{
119 struct usb_hcd *hcd = platform_get_drvdata(pdev);
120 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
121 struct spear_ohci *sohci_p = to_spear_ohci(hcd);
122 bool do_wakeup = device_may_wakeup(&pdev->dev);
123 int ret;
124
125 if (time_before(jiffies, ohci->next_statechange))
126 msleep(5);
127 ohci->next_statechange = jiffies;
128
129 ret = ohci_suspend(hcd, do_wakeup);
130 if (ret)
131 return ret;
132
133 clk_disable_unprepare(sohci_p->clk);
134
135 return ret;
136}
137
138static int spear_ohci_hcd_drv_resume(struct platform_device *dev)
139{
140 struct usb_hcd *hcd = platform_get_drvdata(dev);
141 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
142 struct spear_ohci *sohci_p = to_spear_ohci(hcd);
143
144 if (time_before(jiffies, ohci->next_statechange))
145 msleep(5);
146 ohci->next_statechange = jiffies;
147
148 clk_prepare_enable(sohci_p->clk);
149 ohci_resume(hcd, false);
150 return 0;
151}
152#endif
153
154static const struct of_device_id spear_ohci_id_table[] = {
155 { .compatible = "st,spear600-ohci", },
156 { },
157};
158MODULE_DEVICE_TABLE(of, spear_ohci_id_table);
159
160
161static struct platform_driver spear_ohci_hcd_driver = {
162 .probe = spear_ohci_hcd_drv_probe,
163 .remove = spear_ohci_hcd_drv_remove,
164#ifdef CONFIG_PM
165 .suspend = spear_ohci_hcd_drv_suspend,
166 .resume = spear_ohci_hcd_drv_resume,
167#endif
168 .driver = {
169 .name = "spear-ohci",
170 .of_match_table = spear_ohci_id_table,
171 },
172};
173
174static const struct ohci_driver_overrides spear_overrides __initconst = {
175 .extra_priv_size = sizeof(struct spear_ohci),
176};
177static int __init ohci_spear_init(void)
178{
179 if (usb_disabled())
180 return -ENODEV;
181
182 pr_info("%s: " DRIVER_DESC "\n", hcd_name);
183
184 ohci_init_driver(&ohci_spear_hc_driver, &spear_overrides);
185 return platform_driver_register(&spear_ohci_hcd_driver);
186}
187module_init(ohci_spear_init);
188
189static void __exit ohci_spear_cleanup(void)
190{
191 platform_driver_unregister(&spear_ohci_hcd_driver);
192}
193module_exit(ohci_spear_cleanup);
194
195MODULE_DESCRIPTION(DRIVER_DESC);
196MODULE_AUTHOR("Deepak Sikri");
197MODULE_LICENSE("GPL v2");
198MODULE_ALIAS("platform:spear-ohci");
199
