1 /*
2 * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License as published by the
6 * Free Software Foundation; either version 2 of the License, or (at your
7 * option) any later version.
8 *
9 * You should have received a copy of the GNU General Public License along
10 * with this program; if not, write to the Free Software Foundation, Inc.,
11 * 675 Mass Ave, Cambridge, MA 02139, USA.
12 *
13 */
14
15 #include <linux/platform_device.h>
16 #include <linux/clk.h>
17 #include <linux/regulator/consumer.h>
18
19 struct jz4740_ohci_hcd {
20 struct ohci_hcd ohci_hcd;
21
22 struct regulator *vbus;
23 bool vbus_enabled;
24 struct clk *clk;
25 };
26
hcd_to_jz4740_hcd(struct usb_hcd * hcd)27 static inline struct jz4740_ohci_hcd *hcd_to_jz4740_hcd(struct usb_hcd *hcd)
28 {
29 return (struct jz4740_ohci_hcd *)(hcd->hcd_priv);
30 }
31
jz4740_hcd_to_hcd(struct jz4740_ohci_hcd * jz4740_ohci)32 static inline struct usb_hcd *jz4740_hcd_to_hcd(struct jz4740_ohci_hcd *jz4740_ohci)
33 {
34 return container_of((void *)jz4740_ohci, struct usb_hcd, hcd_priv);
35 }
36
ohci_jz4740_start(struct usb_hcd * hcd)37 static int ohci_jz4740_start(struct usb_hcd *hcd)
38 {
39 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
40 int ret;
41
42 ret = ohci_init(ohci);
43 if (ret < 0)
44 return ret;
45
46 ohci->num_ports = 1;
47
48 ret = ohci_run(ohci);
49 if (ret < 0) {
50 dev_err(hcd->self.controller, "Can not start %s",
51 hcd->self.bus_name);
52 ohci_stop(hcd);
53 return ret;
54 }
55 return 0;
56 }
57
ohci_jz4740_set_vbus_power(struct jz4740_ohci_hcd * jz4740_ohci,bool enabled)58 static int ohci_jz4740_set_vbus_power(struct jz4740_ohci_hcd *jz4740_ohci,
59 bool enabled)
60 {
61 int ret = 0;
62
63 if (!jz4740_ohci->vbus)
64 return 0;
65
66 if (enabled && !jz4740_ohci->vbus_enabled) {
67 ret = regulator_enable(jz4740_ohci->vbus);
68 if (ret)
69 dev_err(jz4740_hcd_to_hcd(jz4740_ohci)->self.controller,
70 "Could not power vbus\n");
71 } else if (!enabled && jz4740_ohci->vbus_enabled) {
72 ret = regulator_disable(jz4740_ohci->vbus);
73 }
74
75 if (ret == 0)
76 jz4740_ohci->vbus_enabled = enabled;
77
78 return ret;
79 }
80
ohci_jz4740_hub_control(struct usb_hcd * hcd,u16 typeReq,u16 wValue,u16 wIndex,char * buf,u16 wLength)81 static int ohci_jz4740_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
82 u16 wIndex, char *buf, u16 wLength)
83 {
84 struct jz4740_ohci_hcd *jz4740_ohci = hcd_to_jz4740_hcd(hcd);
85 int ret;
86
87 switch (typeReq) {
88 case SetHubFeature:
89 if (wValue == USB_PORT_FEAT_POWER)
90 ret = ohci_jz4740_set_vbus_power(jz4740_ohci, true);
91 break;
92 case ClearHubFeature:
93 if (wValue == USB_PORT_FEAT_POWER)
94 ret = ohci_jz4740_set_vbus_power(jz4740_ohci, false);
95 break;
96 }
97
98 if (ret)
99 return ret;
100
101 return ohci_hub_control(hcd, typeReq, wValue, wIndex, buf, wLength);
102 }
103
104
105 static const struct hc_driver ohci_jz4740_hc_driver = {
106 .description = hcd_name,
107 .product_desc = "JZ4740 OHCI",
108 .hcd_priv_size = sizeof(struct jz4740_ohci_hcd),
109
110 /*
111 * generic hardware linkage
112 */
113 .irq = ohci_irq,
114 .flags = HCD_USB11 | HCD_MEMORY,
115
116 /*
117 * basic lifecycle operations
118 */
119 .start = ohci_jz4740_start,
120 .stop = ohci_stop,
121 .shutdown = ohci_shutdown,
122
123 /*
124 * managing i/o requests and associated device resources
125 */
126 .urb_enqueue = ohci_urb_enqueue,
127 .urb_dequeue = ohci_urb_dequeue,
128 .endpoint_disable = ohci_endpoint_disable,
129
130 /*
131 * scheduling support
132 */
133 .get_frame_number = ohci_get_frame,
134
135 /*
136 * root hub support
137 */
138 .hub_status_data = ohci_hub_status_data,
139 .hub_control = ohci_jz4740_hub_control,
140 #ifdef CONFIG_PM
141 .bus_suspend = ohci_bus_suspend,
142 .bus_resume = ohci_bus_resume,
143 #endif
144 .start_port_reset = ohci_start_port_reset,
145 };
146
147
jz4740_ohci_probe(struct platform_device * pdev)148 static __devinit int jz4740_ohci_probe(struct platform_device *pdev)
149 {
150 int ret;
151 struct usb_hcd *hcd;
152 struct jz4740_ohci_hcd *jz4740_ohci;
153 struct resource *res;
154 int irq;
155
156 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
157
158 if (!res) {
159 dev_err(&pdev->dev, "Failed to get platform resource\n");
160 return -ENOENT;
161 }
162
163 irq = platform_get_irq(pdev, 0);
164 if (irq < 0) {
165 dev_err(&pdev->dev, "Failed to get platform irq\n");
166 return irq;
167 }
168
169 hcd = usb_create_hcd(&ohci_jz4740_hc_driver, &pdev->dev, "jz4740");
170 if (!hcd) {
171 dev_err(&pdev->dev, "Failed to create hcd.\n");
172 return -ENOMEM;
173 }
174
175 jz4740_ohci = hcd_to_jz4740_hcd(hcd);
176
177 res = request_mem_region(res->start, resource_size(res), hcd_name);
178 if (!res) {
179 dev_err(&pdev->dev, "Failed to request mem region.\n");
180 ret = -EBUSY;
181 goto err_free;
182 }
183
184 hcd->rsrc_start = res->start;
185 hcd->rsrc_len = resource_size(res);
186 hcd->regs = ioremap(res->start, resource_size(res));
187
188 if (!hcd->regs) {
189 dev_err(&pdev->dev, "Failed to ioremap registers.\n");
190 ret = -EBUSY;
191 goto err_release_mem;
192 }
193
194 jz4740_ohci->clk = clk_get(&pdev->dev, "uhc");
195 if (IS_ERR(jz4740_ohci->clk)) {
196 ret = PTR_ERR(jz4740_ohci->clk);
197 dev_err(&pdev->dev, "Failed to get clock: %d\n", ret);
198 goto err_iounmap;
199 }
200
201 jz4740_ohci->vbus = regulator_get(&pdev->dev, "vbus");
202 if (IS_ERR(jz4740_ohci->vbus))
203 jz4740_ohci->vbus = NULL;
204
205
206 clk_set_rate(jz4740_ohci->clk, 48000000);
207 clk_enable(jz4740_ohci->clk);
208 if (jz4740_ohci->vbus)
209 ohci_jz4740_set_vbus_power(jz4740_ohci, true);
210
211 platform_set_drvdata(pdev, hcd);
212
213 ohci_hcd_init(hcd_to_ohci(hcd));
214
215 ret = usb_add_hcd(hcd, irq, 0);
216 if (ret) {
217 dev_err(&pdev->dev, "Failed to add hcd: %d\n", ret);
218 goto err_disable;
219 }
220
221 return 0;
222
223 err_disable:
224 platform_set_drvdata(pdev, NULL);
225 if (jz4740_ohci->vbus) {
226 regulator_disable(jz4740_ohci->vbus);
227 regulator_put(jz4740_ohci->vbus);
228 }
229 clk_disable(jz4740_ohci->clk);
230
231 clk_put(jz4740_ohci->clk);
232 err_iounmap:
233 iounmap(hcd->regs);
234 err_release_mem:
235 release_mem_region(res->start, resource_size(res));
236 err_free:
237 usb_put_hcd(hcd);
238
239 return ret;
240 }
241
jz4740_ohci_remove(struct platform_device * pdev)242 static __devexit int jz4740_ohci_remove(struct platform_device *pdev)
243 {
244 struct usb_hcd *hcd = platform_get_drvdata(pdev);
245 struct jz4740_ohci_hcd *jz4740_ohci = hcd_to_jz4740_hcd(hcd);
246
247 usb_remove_hcd(hcd);
248
249 platform_set_drvdata(pdev, NULL);
250
251 if (jz4740_ohci->vbus) {
252 regulator_disable(jz4740_ohci->vbus);
253 regulator_put(jz4740_ohci->vbus);
254 }
255
256 clk_disable(jz4740_ohci->clk);
257 clk_put(jz4740_ohci->clk);
258
259 iounmap(hcd->regs);
260 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
261
262 usb_put_hcd(hcd);
263
264 return 0;
265 }
266
267 static struct platform_driver ohci_hcd_jz4740_driver = {
268 .probe = jz4740_ohci_probe,
269 .remove = __devexit_p(jz4740_ohci_remove),
270 .driver = {
271 .name = "jz4740-ohci",
272 .owner = THIS_MODULE,
273 },
274 };
275
276 MODULE_ALIAS("platform:jz4740-ohci");
277