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[openwrt.git] / target / linux / s3c24xx / patches-2.6.24 / 1015-s3c2410-pwm.patch.patch
1 From e9db29d62cbcef7974099c3a4deac69ad2a72190 Mon Sep 17 00:00:00 2001
2 From: mokopatches <mokopatches@openmoko.org>
3 Date: Fri, 4 Apr 2008 11:31:44 +0100
4 Subject: [PATCH] s3c2410-pwm.patch
5 This patch adds a PWM api abstraction for the S3C2410 SoC
6
7 Signed-off-by: Javi Roman <javiroman@kernel-labs.org>
8 Signed-off-by: Harald Welte <laforge@openmoko.org>
9 ---
10 arch/arm/mach-s3c2410/Kconfig | 6 +
11 arch/arm/mach-s3c2410/Makefile | 1 +
12 arch/arm/mach-s3c2410/pwm.c | 214 ++++++++++++++++++++++++++++++++++++
13 include/asm-arm/arch-s3c2410/pwm.h | 40 +++++++
14 4 files changed, 261 insertions(+), 0 deletions(-)
15 create mode 100644 arch/arm/mach-s3c2410/pwm.c
16 create mode 100644 include/asm-arm/arch-s3c2410/pwm.h
17
18 diff --git a/arch/arm/mach-s3c2410/Kconfig b/arch/arm/mach-s3c2410/Kconfig
19 index ff339e1..e42195f 100644
20 --- a/arch/arm/mach-s3c2410/Kconfig
21 +++ b/arch/arm/mach-s3c2410/Kconfig
22 @@ -9,6 +9,7 @@ config CPU_S3C2410
23 depends on ARCH_S3C2410
24 select S3C2410_CLOCK
25 select S3C2410_GPIO
26 + select S3C2410_PWM
27 select CPU_LLSERIAL_S3C2410
28 select S3C2410_PM if PM
29 help
30 @@ -37,6 +38,11 @@ config S3C2410_CLOCK
31 help
32 Clock code for the S3C2410, and similar processors
33
34 +config S3C2410_PWM
35 + bool
36 + help
37 + PWM timer code for the S3C2410, and similar processors
38 +
39
40 menu "S3C2410 Machines"
41
42 diff --git a/arch/arm/mach-s3c2410/Makefile b/arch/arm/mach-s3c2410/Makefile
43 index 8952a8d..bb577f4 100644
44 --- a/arch/arm/mach-s3c2410/Makefile
45 +++ b/arch/arm/mach-s3c2410/Makefile
46 @@ -16,6 +16,7 @@ obj-$(CONFIG_CPU_S3C2410_DMA) += dma.o
47 obj-$(CONFIG_S3C2410_PM) += pm.o sleep.o
48 obj-$(CONFIG_S3C2410_GPIO) += gpio.o
49 obj-$(CONFIG_S3C2410_CLOCK) += clock.o
50 +obj-$(CONFIG_S3C2410_PWM) += pwm.o
51
52 # Machine support
53
54 diff --git a/arch/arm/mach-s3c2410/pwm.c b/arch/arm/mach-s3c2410/pwm.c
55 new file mode 100644
56 index 0000000..8a07359
57 --- /dev/null
58 +++ b/arch/arm/mach-s3c2410/pwm.c
59 @@ -0,0 +1,214 @@
60 +/*
61 + * arch/arm/mach-s3c2410/3c2410-pwm.c
62 + *
63 + * Copyright (c) by Javi Roman <javiroman@kernel-labs.org>
64 + * for the OpenMoko Project.
65 + *
66 + * S3C2410A SoC PWM support
67 + *
68 + * This program is free software; you can redistribute it and/or modify
69 + * it under the terms of the GNU General Public License as published by
70 + * the Free Software Foundation; either version 2 of the License, or
71 + * (at your option) any later version.
72 + *
73 + * You should have received a copy of the GNU General Public License
74 + * along with this program; if not, write to the Free Software
75 + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
76 + *
77 + */
78 +
79 +#include <linux/kernel.h>
80 +#include <linux/init.h>
81 +#include <linux/clk.h>
82 +#include <asm/hardware.h>
83 +#include <asm/plat-s3c/regs-timer.h>
84 +#include <asm/arch/pwm.h>
85 +
86 +int s3c2410_pwm_disable(struct s3c2410_pwm *pwm)
87 +{
88 + unsigned long tcon;
89 +
90 + /* stop timer */
91 + tcon = __raw_readl(S3C2410_TCON);
92 + tcon &= 0xffffff00;
93 + __raw_writel(tcon, S3C2410_TCON);
94 +
95 + clk_disable(pwm->pclk);
96 + clk_put(pwm->pclk);
97 +
98 + return 0;
99 +}
100 +EXPORT_SYMBOL_GPL(s3c2410_pwm_disable);
101 +
102 +int s3c2410_pwm_init(struct s3c2410_pwm *pwm)
103 +{
104 + pwm->pclk = clk_get(NULL, "timers");
105 + if (IS_ERR(pwm->pclk))
106 + return PTR_ERR(pwm->pclk);
107 +
108 + clk_enable(pwm->pclk);
109 + pwm->pclk_rate = clk_get_rate(pwm->pclk);
110 + return 0;
111 +}
112 +EXPORT_SYMBOL_GPL(s3c2410_pwm_init);
113 +
114 +int s3c2410_pwm_enable(struct s3c2410_pwm *pwm)
115 +{
116 + unsigned long tcfg0, tcfg1, tcnt, tcmp;
117 +
118 + /* control registers bits */
119 + tcfg1 = __raw_readl(S3C2410_TCFG1);
120 + tcfg0 = __raw_readl(S3C2410_TCFG0);
121 +
122 + /* divider & scaler slection */
123 + switch (pwm->timerid) {
124 + case PWM0:
125 + tcfg1 &= ~S3C2410_TCFG1_MUX0_MASK;
126 + tcfg0 &= ~S3C2410_TCFG_PRESCALER0_MASK;
127 + break;
128 + case PWM1:
129 + tcfg1 &= ~S3C2410_TCFG1_MUX1_MASK;
130 + tcfg0 &= ~S3C2410_TCFG_PRESCALER0_MASK;
131 + break;
132 + case PWM2:
133 + tcfg1 &= ~S3C2410_TCFG1_MUX2_MASK;
134 + tcfg0 &= ~S3C2410_TCFG_PRESCALER1_MASK;
135 + break;
136 + case PWM3:
137 + tcfg1 &= ~S3C2410_TCFG1_MUX3_MASK;
138 + tcfg0 &= ~S3C2410_TCFG_PRESCALER1_MASK;
139 + break;
140 + case PWM4:
141 + /* timer four is not capable of doing PWM */
142 + break;
143 + default:
144 + clk_disable(pwm->pclk);
145 + clk_put(pwm->pclk);
146 + return -1;
147 + }
148 +
149 + /* divider & scaler values */
150 + tcfg1 |= pwm->divider;
151 + __raw_writel(tcfg1, S3C2410_TCFG1);
152 +
153 + switch (pwm->timerid) {
154 + case PWM0:
155 + case PWM1:
156 + tcfg0 |= pwm->prescaler;
157 + __raw_writel(tcfg0, S3C2410_TCFG0);
158 + break;
159 + default:
160 + if ((tcfg0 | pwm->prescaler) != tcfg0) {
161 + printk(KERN_WARNING "not changing prescaler of PWM %u,"
162 + " since it's shared with timer4 (clock tick)\n",
163 + pwm->timerid);
164 + }
165 + break;
166 + }
167 +
168 + /* timer count and compare buffer initial values */
169 + tcnt = pwm->counter;
170 + tcmp = pwm->comparer;
171 +
172 + __raw_writel(tcnt, S3C2410_TCNTB(pwm->timerid));
173 + __raw_writel(tcmp, S3C2410_TCMPB(pwm->timerid));
174 +
175 + /* ensure timer is stopped */
176 + s3c2410_pwm_stop(pwm);
177 +
178 + return 0;
179 +}
180 +EXPORT_SYMBOL_GPL(s3c2410_pwm_enable);
181 +
182 +int s3c2410_pwm_start(struct s3c2410_pwm *pwm)
183 +{
184 + unsigned long tcon;
185 +
186 + tcon = __raw_readl(S3C2410_TCON);
187 +
188 + switch (pwm->timerid) {
189 + case PWM0:
190 + tcon |= S3C2410_TCON_T0START;
191 + tcon &= ~S3C2410_TCON_T0MANUALUPD;
192 + break;
193 + case PWM1:
194 + tcon |= S3C2410_TCON_T1START;
195 + tcon &= ~S3C2410_TCON_T1MANUALUPD;
196 + break;
197 + case PWM2:
198 + tcon |= S3C2410_TCON_T2START;
199 + tcon &= ~S3C2410_TCON_T2MANUALUPD;
200 + break;
201 + case PWM3:
202 + tcon |= S3C2410_TCON_T3START;
203 + tcon &= ~S3C2410_TCON_T3MANUALUPD;
204 + break;
205 + case PWM4:
206 + /* timer four is not capable of doing PWM */
207 + default:
208 + return -ENODEV;
209 + }
210 +
211 + __raw_writel(tcon, S3C2410_TCON);
212 +
213 + return 0;
214 +}
215 +EXPORT_SYMBOL_GPL(s3c2410_pwm_start);
216 +
217 +int s3c2410_pwm_stop(struct s3c2410_pwm *pwm)
218 +{
219 + unsigned long tcon;
220 +
221 + tcon = __raw_readl(S3C2410_TCON);
222 +
223 + switch (pwm->timerid) {
224 + case PWM0:
225 + tcon &= ~0x00000000;
226 + tcon |= S3C2410_TCON_T0RELOAD;
227 + tcon |= S3C2410_TCON_T0MANUALUPD;
228 + break;
229 + case PWM1:
230 + tcon &= ~0x00000080;
231 + tcon |= S3C2410_TCON_T1RELOAD;
232 + tcon |= S3C2410_TCON_T1MANUALUPD;
233 + break;
234 + case PWM2:
235 + tcon &= ~0x00000800;
236 + tcon |= S3C2410_TCON_T2RELOAD;
237 + tcon |= S3C2410_TCON_T2MANUALUPD;
238 + break;
239 + case PWM3:
240 + tcon &= ~0x00008000;
241 + tcon |= S3C2410_TCON_T3RELOAD;
242 + tcon |= S3C2410_TCON_T3MANUALUPD;
243 + break;
244 + case PWM4:
245 + /* timer four is not capable of doing PWM */
246 + default:
247 + return -ENODEV;
248 + }
249 +
250 + __raw_writel(tcon, S3C2410_TCON);
251 +
252 + return 0;
253 +}
254 +EXPORT_SYMBOL_GPL(s3c2410_pwm_stop);
255 +
256 +int s3c2410_pwm_duty_cycle(int reg_value, struct s3c2410_pwm *pwm)
257 +{
258 + __raw_writel(reg_value, S3C2410_TCMPB(pwm->timerid));
259 +
260 + return 0;
261 +}
262 +EXPORT_SYMBOL_GPL(s3c2410_pwm_duty_cycle);
263 +
264 +int s3c2410_pwm_dumpregs(void)
265 +{
266 + printk(KERN_INFO "TCON: %08lx, TCFG0: %08lx, TCFG1: %08lx\n",
267 + (unsigned long) __raw_readl(S3C2410_TCON),
268 + (unsigned long) __raw_readl(S3C2410_TCFG0),
269 + (unsigned long) __raw_readl(S3C2410_TCFG1));
270 +
271 + return 0;
272 +}
273 +EXPORT_SYMBOL_GPL(s3c2410_pwm_dumpregs);
274 diff --git a/include/asm-arm/arch-s3c2410/pwm.h b/include/asm-arm/arch-s3c2410/pwm.h
275 new file mode 100644
276 index 0000000..a797ec3
277 --- /dev/null
278 +++ b/include/asm-arm/arch-s3c2410/pwm.h
279 @@ -0,0 +1,40 @@
280 +#ifndef __S3C2410_PWM_H
281 +#define __S3C2410_PWM_H
282 +
283 +#include <linux/err.h>
284 +#include <linux/platform_device.h>
285 +#include <linux/clk.h>
286 +
287 +#include <asm-arm/io.h>
288 +#include <asm/arch/hardware.h>
289 +#include <asm/mach-types.h>
290 +#include <asm/plat-s3c/regs-timer.h>
291 +#include <asm/arch/gta01.h>
292 +
293 +enum pwm_timer {
294 + PWM0,
295 + PWM1,
296 + PWM2,
297 + PWM3,
298 + PWM4
299 +};
300 +
301 +struct s3c2410_pwm {
302 + enum pwm_timer timerid;
303 + struct clk *pclk;
304 + unsigned long pclk_rate;
305 + unsigned long prescaler;
306 + unsigned long divider;
307 + unsigned long counter;
308 + unsigned long comparer;
309 +};
310 +
311 +int s3c2410_pwm_init(struct s3c2410_pwm *s3c2410_pwm);
312 +int s3c2410_pwm_enable(struct s3c2410_pwm *s3c2410_pwm);
313 +int s3c2410_pwm_disable(struct s3c2410_pwm *s3c2410_pwm);
314 +int s3c2410_pwm_start(struct s3c2410_pwm *s3c2410_pwm);
315 +int s3c2410_pwm_stop(struct s3c2410_pwm *s3c2410_pwm);
316 +int s3c2410_pwm_duty_cycle(int reg_value, struct s3c2410_pwm *s3c2410_pwm);
317 +int s3c2410_pwm_dumpregs(void);
318 +
319 +#endif /* __S3C2410_PWM_H */
320 --
321 1.5.6.5
322
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