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
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
|
/*
* arch/arm/plat-s3c/pwm.c
*
* Copyright (c) by Javi Roman <javiroman@kernel-labs.org>
* for the Openmoko Project.
*
* S3C2410A SoC PWM support
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/clk.h>
#include <linux/device.h>
#include <mach/hardware.h>
#include <plat/regs-timer.h>
#include <plat/pwm.h>
#include <asm/io.h>
#ifdef CONFIG_PM
static unsigned long standby_reg_tcon;
static unsigned long standby_reg_tcfg0;
static unsigned long standby_reg_tcfg1;
#endif
int s3c2410_pwm_disable(struct s3c2410_pwm *pwm)
{
unsigned long tcon;
/* stop timer */
tcon = __raw_readl(S3C2410_TCON);
tcon &= 0xffffff00;
__raw_writel(tcon, S3C2410_TCON);
clk_disable(pwm->pclk);
clk_put(pwm->pclk);
return 0;
}
EXPORT_SYMBOL_GPL(s3c2410_pwm_disable);
int s3c2410_pwm_init(struct s3c2410_pwm *pwm)
{
pwm->pclk = clk_get(NULL, "timers");
if (IS_ERR(pwm->pclk))
return PTR_ERR(pwm->pclk);
clk_enable(pwm->pclk);
pwm->pclk_rate = clk_get_rate(pwm->pclk);
return 0;
}
EXPORT_SYMBOL_GPL(s3c2410_pwm_init);
int s3c2410_pwm_enable(struct s3c2410_pwm *pwm)
{
unsigned long tcfg0, tcfg1, tcnt, tcmp;
/* control registers bits */
tcfg1 = __raw_readl(S3C2410_TCFG1);
tcfg0 = __raw_readl(S3C2410_TCFG0);
/* divider & scaler slection */
switch (pwm->timerid) {
case PWM0:
tcfg1 &= ~S3C2410_TCFG1_MUX0_MASK;
tcfg0 &= ~S3C2410_TCFG_PRESCALER0_MASK;
break;
case PWM1:
tcfg1 &= ~S3C2410_TCFG1_MUX1_MASK;
tcfg0 &= ~S3C2410_TCFG_PRESCALER0_MASK;
break;
case PWM2:
tcfg1 &= ~S3C2410_TCFG1_MUX2_MASK;
tcfg0 &= ~S3C2410_TCFG_PRESCALER1_MASK;
break;
case PWM3:
tcfg1 &= ~S3C2410_TCFG1_MUX3_MASK;
tcfg0 &= ~S3C2410_TCFG_PRESCALER1_MASK;
break;
case PWM4:
/* timer four is not capable of doing PWM */
break;
default:
clk_disable(pwm->pclk);
clk_put(pwm->pclk);
return -1;
}
/* divider & scaler values */
tcfg1 |= pwm->divider;
__raw_writel(tcfg1, S3C2410_TCFG1);
switch (pwm->timerid) {
case PWM0:
case PWM1:
tcfg0 |= pwm->prescaler;
__raw_writel(tcfg0, S3C2410_TCFG0);
break;
default:
if ((tcfg0 | pwm->prescaler) != tcfg0) {
printk(KERN_WARNING "not changing prescaler of PWM %u,"
" since it's shared with timer4 (clock tick)\n",
pwm->timerid);
}
break;
}
/* timer count and compare buffer initial values */
tcnt = pwm->counter;
tcmp = pwm->comparer;
__raw_writel(tcnt, S3C2410_TCNTB(pwm->timerid));
__raw_writel(tcmp, S3C2410_TCMPB(pwm->timerid));
/* ensure timer is stopped */
s3c2410_pwm_stop(pwm);
return 0;
}
EXPORT_SYMBOL_GPL(s3c2410_pwm_enable);
int s3c2410_pwm_start(struct s3c2410_pwm *pwm)
{
unsigned long tcon;
tcon = __raw_readl(S3C2410_TCON);
switch (pwm->timerid) {
case PWM0:
tcon |= S3C2410_TCON_T0START;
tcon &= ~S3C2410_TCON_T0MANUALUPD;
break;
case PWM1:
tcon |= S3C2410_TCON_T1START;
tcon &= ~S3C2410_TCON_T1MANUALUPD;
break;
case PWM2:
tcon |= S3C2410_TCON_T2START;
tcon &= ~S3C2410_TCON_T2MANUALUPD;
break;
case PWM3:
tcon |= S3C2410_TCON_T3START;
tcon &= ~S3C2410_TCON_T3MANUALUPD;
break;
case PWM4:
/* timer four is not capable of doing PWM */
default:
return -ENODEV;
}
__raw_writel(tcon, S3C2410_TCON);
return 0;
}
EXPORT_SYMBOL_GPL(s3c2410_pwm_start);
int s3c2410_pwm_stop(struct s3c2410_pwm *pwm)
{
unsigned long tcon;
tcon = __raw_readl(S3C2410_TCON);
switch (pwm->timerid) {
case PWM0:
tcon &= ~0x00000000;
tcon |= S3C2410_TCON_T0RELOAD;
tcon |= S3C2410_TCON_T0MANUALUPD;
break;
case PWM1:
tcon &= ~0x00000080;
tcon |= S3C2410_TCON_T1RELOAD;
tcon |= S3C2410_TCON_T1MANUALUPD;
break;
case PWM2:
tcon &= ~0x00000800;
tcon |= S3C2410_TCON_T2RELOAD;
tcon |= S3C2410_TCON_T2MANUALUPD;
break;
case PWM3:
tcon &= ~0x00008000;
tcon |= S3C2410_TCON_T3RELOAD;
tcon |= S3C2410_TCON_T3MANUALUPD;
break;
case PWM4:
/* timer four is not capable of doing PWM */
default:
return -ENODEV;
}
__raw_writel(tcon, S3C2410_TCON);
return 0;
}
EXPORT_SYMBOL_GPL(s3c2410_pwm_stop);
int s3c2410_pwm_duty_cycle(int reg_value, struct s3c2410_pwm *pwm)
{
__raw_writel(reg_value, S3C2410_TCMPB(pwm->timerid));
return 0;
}
EXPORT_SYMBOL_GPL(s3c2410_pwm_duty_cycle);
int s3c2410_pwm_dumpregs(void)
{
printk(KERN_INFO "TCON: %08lx, TCFG0: %08lx, TCFG1: %08lx\n",
(unsigned long) __raw_readl(S3C2410_TCON),
(unsigned long) __raw_readl(S3C2410_TCFG0),
(unsigned long) __raw_readl(S3C2410_TCFG1));
return 0;
}
EXPORT_SYMBOL_GPL(s3c2410_pwm_dumpregs);
static int __init s3c24xx_pwm_probe(struct platform_device *pdev)
{
struct s3c24xx_pwm_platform_data *pdata = pdev->dev.platform_data;
dev_info(&pdev->dev, "s3c24xx_pwm is registered \n");
/* if platform was interested, give him a chance to register
* platform devices that switch power with us as the parent
* at registration time -- ensures suspend / resume ordering
*/
if (pdata)
if (pdata->attach_child_devices)
(pdata->attach_child_devices)(&pdev->dev);
return 0;
}
#ifdef CONFIG_PM
static int s3c24xx_pwm_suspend(struct platform_device *pdev, pm_message_t state)
{
/* PWM config should be kept in suspending */
standby_reg_tcon = __raw_readl(S3C2410_TCON);
standby_reg_tcfg0 = __raw_readl(S3C2410_TCFG0);
standby_reg_tcfg1 = __raw_readl(S3C2410_TCFG1);
return 0;
}
static int s3c24xx_pwm_resume(struct platform_device *pdev)
{
__raw_writel(standby_reg_tcon, S3C2410_TCON);
__raw_writel(standby_reg_tcfg0, S3C2410_TCFG0);
__raw_writel(standby_reg_tcfg1, S3C2410_TCFG1);
return 0;
}
#else
#define s3c24xx_pwm_suspend NULL
#define s3c24xx_pwm_resume NULL
#endif
static struct platform_driver s3c24xx_pwm_driver = {
.driver = {
.name = "s3c24xx_pwm",
.owner = THIS_MODULE,
},
.probe = s3c24xx_pwm_probe,
.suspend = s3c24xx_pwm_suspend,
.resume = s3c24xx_pwm_resume,
};
static int __init s3c24xx_pwm_init(void)
{
return platform_driver_register(&s3c24xx_pwm_driver);
}
static void __exit s3c24xx_pwm_exit(void)
{
}
MODULE_AUTHOR("Javi Roman <javiroman@kernel-labs.org>");
MODULE_LICENSE("GPL");
module_init(s3c24xx_pwm_init);
module_exit(s3c24xx_pwm_exit);
|
