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