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
|
/*
* Copyright (C) 2006 Atmel Corporation
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* 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., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
#include <asm/arch/platform.h>
#include "sm.h"
struct device_state {
int refcount;
};
static struct device_state device_state[NR_DEVICES];
static int claim_resource(const struct resource *res)
{
int ret = 0;
switch (res->type) {
case RESOURCE_GPIO:
ret = gpio_set_func(res->u.gpio.gpio_dev,
res->u.gpio.start,
res->u.gpio.nr_pins,
res->u.gpio.func);
break;
case RESOURCE_CLOCK:
ret = pm_enable_clock(res->u.clock.id, res->u.clock.index);
break;
}
return ret;
}
static void free_resource(const struct resource *res)
{
switch (res->type) {
case RESOURCE_GPIO:
gpio_free(res->u.gpio.gpio_dev, res->u.gpio.start,
res->u.gpio.nr_pins);
break;
case RESOURCE_CLOCK:
pm_disable_clock(res->u.clock.id, res->u.clock.index);
break;
}
}
static int init_dev(const struct device *dev)
{
unsigned int i;
int ret = 0;
for (i = 0; i < dev->nr_resources; i++) {
ret = claim_resource(&dev->resource[i]);
if (ret)
goto cleanup;
}
return 0;
cleanup:
while (i--)
free_resource(&dev->resource[i]);
return ret;
}
const struct device *get_device(enum device_id devid)
{
struct device_state *devstate;
const struct device *dev;
unsigned long flags;
int initialized = 0;
int ret = 0;
devstate = &device_state[devid];
dev = &chip_device[devid];
flags = disable_interrupts();
if (devstate->refcount++)
initialized = 1;
if (flags)
enable_interrupts();
if (!initialized)
ret = init_dev(dev);
return ret ? NULL : dev;
}
void put_device(const struct device *dev)
{
struct device_state *devstate;
unsigned long devid, flags;
devid = (unsigned long)(dev - chip_device) / sizeof(struct device);
devstate = &device_state[devid];
flags = disable_interrupts();
devstate--;
if (!devstate) {
unsigned int i;
for (i = 0; i < dev->nr_resources; i++)
free_resource(&dev->resource[i]);
}
if (flags)
enable_interrupts();
}
|
