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Deepak Sikric8c38de2010-11-10 14:33:18 +05301/*
2* OHCI HCD (Host Controller Driver) for USB.
3*
4* Copyright (C) 2010 ST Microelectronics.
5* Deepak Sikri<deepak.sikri@st.com>
6*
7* Based on various ohci-*.c drivers
8*
9* This file is licensed under the terms of the GNU General Public
10* License version 2. This program is licensed "as is" without any
11* warranty of any kind, whether express or implied.
12*/
13
14#include <linux/signal.h>
15#include <linux/platform_device.h>
16#include <linux/clk.h>
Stefan Roese56fafb92012-04-16 09:08:08 +053017#include <linux/of.h>
Deepak Sikric8c38de2010-11-10 14:33:18 +053018
19struct spear_ohci {
20 struct ohci_hcd ohci;
21 struct clk *clk;
22};
23
24#define to_spear_ohci(hcd) (struct spear_ohci *)hcd_to_ohci(hcd)
25
26static void spear_start_ohci(struct spear_ohci *ohci)
27{
28 clk_enable(ohci->clk);
29}
30
31static void spear_stop_ohci(struct spear_ohci *ohci)
32{
33 clk_disable(ohci->clk);
34}
35
36static int __devinit ohci_spear_start(struct usb_hcd *hcd)
37{
38 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
39 int ret;
40
41 ret = ohci_init(ohci);
42 if (ret < 0)
43 return ret;
44 ohci->regs = hcd->regs;
45
46 ret = ohci_run(ohci);
47 if (ret < 0) {
48 dev_err(hcd->self.controller, "can't start\n");
49 ohci_stop(hcd);
50 return ret;
51 }
52
53 create_debug_files(ohci);
54
55#ifdef DEBUG
56 ohci_dump(ohci, 1);
57#endif
58 return 0;
59}
60
61static const struct hc_driver ohci_spear_hc_driver = {
62 .description = hcd_name,
63 .product_desc = "SPEAr OHCI",
64 .hcd_priv_size = sizeof(struct spear_ohci),
65
66 /* generic hardware linkage */
67 .irq = ohci_irq,
68 .flags = HCD_USB11 | HCD_MEMORY,
69
70 /* basic lifecycle operations */
71 .start = ohci_spear_start,
72 .stop = ohci_stop,
73 .shutdown = ohci_shutdown,
74#ifdef CONFIG_PM
75 .bus_suspend = ohci_bus_suspend,
76 .bus_resume = ohci_bus_resume,
77#endif
78
79 /* managing i/o requests and associated device resources */
80 .urb_enqueue = ohci_urb_enqueue,
81 .urb_dequeue = ohci_urb_dequeue,
82 .endpoint_disable = ohci_endpoint_disable,
83
84 /* scheduling support */
85 .get_frame_number = ohci_get_frame,
86
87 /* root hub support */
88 .hub_status_data = ohci_hub_status_data,
89 .hub_control = ohci_hub_control,
90
91 .start_port_reset = ohci_start_port_reset,
92};
93
Stefan Roese56fafb92012-04-16 09:08:08 +053094static u64 spear_ohci_dma_mask = DMA_BIT_MASK(32);
95
Deepak Sikric8c38de2010-11-10 14:33:18 +053096static int spear_ohci_hcd_drv_probe(struct platform_device *pdev)
97{
98 const struct hc_driver *driver = &ohci_spear_hc_driver;
99 struct usb_hcd *hcd = NULL;
100 struct clk *usbh_clk;
101 struct spear_ohci *ohci_p;
102 struct resource *res;
103 int retval, irq;
Deepak Sikric8c38de2010-11-10 14:33:18 +0530104 char clk_name[20] = "usbh_clk";
Stefan Roese56fafb92012-04-16 09:08:08 +0530105 static int instance = -1;
Deepak Sikric8c38de2010-11-10 14:33:18 +0530106
107 irq = platform_get_irq(pdev, 0);
108 if (irq < 0) {
109 retval = irq;
110 goto fail_irq_get;
111 }
112
Stefan Roese56fafb92012-04-16 09:08:08 +0530113 /*
114 * Right now device-tree probed devices don't get dma_mask set.
115 * Since shared usb code relies on it, set it here for now.
116 * Once we have dma capability bindings this can go away.
117 */
118 if (!pdev->dev.dma_mask)
119 pdev->dev.dma_mask = &spear_ohci_dma_mask;
120
121 /*
122 * Increment the device instance, when probing via device-tree
123 */
124 if (pdev->id < 0)
125 instance++;
126 else
127 instance = pdev->id;
128 sprintf(clk_name, "usbh.%01d_clk", instance);
Deepak Sikric8c38de2010-11-10 14:33:18 +0530129
130 usbh_clk = clk_get(NULL, clk_name);
131 if (IS_ERR(usbh_clk)) {
132 dev_err(&pdev->dev, "Error getting interface clock\n");
133 retval = PTR_ERR(usbh_clk);
134 goto fail_get_usbh_clk;
135 }
136
137 hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
138 if (!hcd) {
139 retval = -ENOMEM;
140 goto fail_create_hcd;
141 }
142
143 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
144 if (!res) {
145 retval = -ENODEV;
146 goto fail_request_resource;
147 }
148
149 hcd->rsrc_start = pdev->resource[0].start;
150 hcd->rsrc_len = resource_size(res);
151 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
152 dev_dbg(&pdev->dev, "request_mem_region failed\n");
153 retval = -EBUSY;
154 goto fail_request_resource;
155 }
156
157 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
158 if (!hcd->regs) {
159 dev_dbg(&pdev->dev, "ioremap failed\n");
160 retval = -ENOMEM;
161 goto fail_ioremap;
162 }
163
164 ohci_p = (struct spear_ohci *)hcd_to_ohci(hcd);
165 ohci_p->clk = usbh_clk;
166 spear_start_ohci(ohci_p);
167 ohci_hcd_init(hcd_to_ohci(hcd));
168
Yong Zhangb5dd18d2011-09-07 16:10:52 +0800169 retval = usb_add_hcd(hcd, platform_get_irq(pdev, 0), 0);
Deepak Sikric8c38de2010-11-10 14:33:18 +0530170 if (retval == 0)
171 return retval;
172
173 spear_stop_ohci(ohci_p);
174 iounmap(hcd->regs);
175fail_ioremap:
176 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
177fail_request_resource:
178 usb_put_hcd(hcd);
179fail_create_hcd:
180 clk_put(usbh_clk);
181fail_get_usbh_clk:
182fail_irq_get:
183 dev_err(&pdev->dev, "init fail, %d\n", retval);
184
185 return retval;
186}
187
188static int spear_ohci_hcd_drv_remove(struct platform_device *pdev)
189{
190 struct usb_hcd *hcd = platform_get_drvdata(pdev);
191 struct spear_ohci *ohci_p = to_spear_ohci(hcd);
192
193 usb_remove_hcd(hcd);
194 if (ohci_p->clk)
195 spear_stop_ohci(ohci_p);
196
197 iounmap(hcd->regs);
198 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
199 usb_put_hcd(hcd);
200
201 if (ohci_p->clk)
202 clk_put(ohci_p->clk);
203 platform_set_drvdata(pdev, NULL);
204 return 0;
205}
206
207#if defined(CONFIG_PM)
208static int spear_ohci_hcd_drv_suspend(struct platform_device *dev,
209 pm_message_t message)
210{
211 struct usb_hcd *hcd = platform_get_drvdata(dev);
212 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
213 struct spear_ohci *ohci_p = to_spear_ohci(hcd);
214
215 if (time_before(jiffies, ohci->next_statechange))
216 msleep(5);
217 ohci->next_statechange = jiffies;
218
219 spear_stop_ohci(ohci_p);
Deepak Sikric8c38de2010-11-10 14:33:18 +0530220 return 0;
221}
222
223static int spear_ohci_hcd_drv_resume(struct platform_device *dev)
224{
225 struct usb_hcd *hcd = platform_get_drvdata(dev);
226 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
227 struct spear_ohci *ohci_p = to_spear_ohci(hcd);
228
229 if (time_before(jiffies, ohci->next_statechange))
230 msleep(5);
231 ohci->next_statechange = jiffies;
232
233 spear_start_ohci(ohci_p);
234 ohci_finish_controller_resume(hcd);
235 return 0;
236}
237#endif
238
Stefan Roese56fafb92012-04-16 09:08:08 +0530239static struct of_device_id spear_ohci_id_table[] __devinitdata = {
240 { .compatible = "st,spear600-ohci", },
241 { },
242};
243
Deepak Sikric8c38de2010-11-10 14:33:18 +0530244/* Driver definition to register with the platform bus */
245static struct platform_driver spear_ohci_hcd_driver = {
246 .probe = spear_ohci_hcd_drv_probe,
247 .remove = spear_ohci_hcd_drv_remove,
248#ifdef CONFIG_PM
249 .suspend = spear_ohci_hcd_drv_suspend,
250 .resume = spear_ohci_hcd_drv_resume,
251#endif
252 .driver = {
253 .owner = THIS_MODULE,
254 .name = "spear-ohci",
Stefan Roese56fafb92012-04-16 09:08:08 +0530255 .of_match_table = of_match_ptr(spear_ohci_id_table),
Deepak Sikric8c38de2010-11-10 14:33:18 +0530256 },
257};
258
259MODULE_ALIAS("platform:spear-ohci");