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1/* linux/arch/arm/plat-s3c/gpio-config.c
2 *
3 * Copyright 2008 Openmoko, Inc.
4 * Copyright 2008-2010 Simtec Electronics
5 * Ben Dooks <ben@simtec.co.uk>
6 * http://armlinux.simtec.co.uk/
7 *
8 * S3C series GPIO configuration core
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13*/
14
15#include <linux/kernel.h>
16#include <linux/module.h>
17#include <linux/gpio.h>
18#include <linux/io.h>
19
20#include <plat/gpio-core.h>
21#include <plat/gpio-cfg.h>
22#include <plat/gpio-cfg-helpers.h>
23
24int s3c_gpio_cfgpin(unsigned int pin, unsigned int config)
25{
26 struct s3c_gpio_chip *chip = s3c_gpiolib_getchip(pin);
27 unsigned long flags;
28 int offset;
29 int ret;
30
31 if (!chip)
32 return -EINVAL;
33
34 offset = pin - chip->chip.base;
35
36 s3c_gpio_lock(chip, flags);
37 ret = s3c_gpio_do_setcfg(chip, offset, config);
38 s3c_gpio_unlock(chip, flags);
39
40 return ret;
41}
42EXPORT_SYMBOL(s3c_gpio_cfgpin);
43
44int s3c_gpio_cfgpin_range(unsigned int start, unsigned int nr,
45 unsigned int cfg)
46{
47 int ret;
48
49 for (; nr > 0; nr--, start++) {
50 ret = s3c_gpio_cfgpin(start, cfg);
51 if (ret != 0)
52 return ret;
53 }
54
55 return 0;
56}
57EXPORT_SYMBOL_GPL(s3c_gpio_cfgpin_range);
58
59int s3c_gpio_cfgall_range(unsigned int start, unsigned int nr,
60 unsigned int cfg, s3c_gpio_pull_t pull)
61{
62 int ret;
63
64 for (; nr > 0; nr--, start++) {
65 s3c_gpio_setpull(start, pull);
66 ret = s3c_gpio_cfgpin(start, cfg);
67 if (ret != 0)
68 return ret;
69 }
70
71 return 0;
72}
73EXPORT_SYMBOL_GPL(s3c_gpio_cfgall_range);
74
75unsigned s3c_gpio_getcfg(unsigned int pin)
76{
77 struct s3c_gpio_chip *chip = s3c_gpiolib_getchip(pin);
78 unsigned long flags;
79 unsigned ret = 0;
80 int offset;
81
82 if (chip) {
83 offset = pin - chip->chip.base;
84
85 s3c_gpio_lock(chip, flags);
86 ret = s3c_gpio_do_getcfg(chip, offset);
87 s3c_gpio_unlock(chip, flags);
88 }
89
90 return ret;
91}
92EXPORT_SYMBOL(s3c_gpio_getcfg);
93
94
95int s3c_gpio_setpull(unsigned int pin, s3c_gpio_pull_t pull)
96{
97 struct s3c_gpio_chip *chip = s3c_gpiolib_getchip(pin);
98 unsigned long flags;
99 int offset, ret;
100
101 if (!chip)
102 return -EINVAL;
103
104 offset = pin - chip->chip.base;
105
106 s3c_gpio_lock(chip, flags);
107 ret = s3c_gpio_do_setpull(chip, offset, pull);
108 s3c_gpio_unlock(chip, flags);
109
110 return ret;
111}
112EXPORT_SYMBOL(s3c_gpio_setpull);
113
114s3c_gpio_pull_t s3c_gpio_getpull(unsigned int pin)
115{
116 struct s3c_gpio_chip *chip = s3c_gpiolib_getchip(pin);
117 unsigned long flags;
118 int offset;
119 u32 pup = 0;
120
121 if (chip) {
122 offset = pin - chip->chip.base;
123
124 s3c_gpio_lock(chip, flags);
125 pup = s3c_gpio_do_getpull(chip, offset);
126 s3c_gpio_unlock(chip, flags);
127 }
128
129 return (__force s3c_gpio_pull_t)pup;
130}
131EXPORT_SYMBOL(s3c_gpio_getpull);
132
133#ifdef CONFIG_S3C_GPIO_CFG_S3C24XX
134int s3c_gpio_setcfg_s3c24xx_a(struct s3c_gpio_chip *chip,
135 unsigned int off, unsigned int cfg)
136{
137 void __iomem *reg = chip->base;
138 unsigned int shift = off;
139 u32 con;
140
141 if (s3c_gpio_is_cfg_special(cfg)) {
142 cfg &= 0xf;
143
144 /* Map output to 0, and SFN2 to 1 */
145 cfg -= 1;
146 if (cfg > 1)
147 return -EINVAL;
148
149 cfg <<= shift;
150 }
151
152 con = __raw_readl(reg);
153 con &= ~(0x1 << shift);
154 con |= cfg;
155 __raw_writel(con, reg);
156
157 return 0;
158}
159
160unsigned s3c_gpio_getcfg_s3c24xx_a(struct s3c_gpio_chip *chip,
161 unsigned int off)
162{
163 u32 con;
164
165 con = __raw_readl(chip->base);
166 con >>= off;
167 con &= 1;
168 con++;
169
170 return S3C_GPIO_SFN(con);
171}
172
173int s3c_gpio_setcfg_s3c24xx(struct s3c_gpio_chip *chip,
174 unsigned int off, unsigned int cfg)
175{
176 void __iomem *reg = chip->base;
177 unsigned int shift = off * 2;
178 u32 con;
179
180 if (s3c_gpio_is_cfg_special(cfg)) {
181 cfg &= 0xf;
182 if (cfg > 3)
183 return -EINVAL;
184
185 cfg <<= shift;
186 }
187
188 con = __raw_readl(reg);
189 con &= ~(0x3 << shift);
190 con |= cfg;
191 __raw_writel(con, reg);
192
193 return 0;
194}
195
196unsigned int s3c_gpio_getcfg_s3c24xx(struct s3c_gpio_chip *chip,
197 unsigned int off)
198{
199 u32 con;
200
201 con = __raw_readl(chip->base);
202 con >>= off * 2;
203 con &= 3;
204
205 /* this conversion works for IN and OUT as well as special mode */
206 return S3C_GPIO_SPECIAL(con);
207}
208#endif
209
210#ifdef CONFIG_S3C_GPIO_CFG_S3C64XX
211int s3c_gpio_setcfg_s3c64xx_4bit(struct s3c_gpio_chip *chip,
212 unsigned int off, unsigned int cfg)
213{
214 void __iomem *reg = chip->base;
215 unsigned int shift = (off & 7) * 4;
216 u32 con;
217
218 if (off < 8 && chip->chip.ngpio > 8)
219 reg -= 4;
220
221 if (s3c_gpio_is_cfg_special(cfg)) {
222 cfg &= 0xf;
223 cfg <<= shift;
224 }
225
226 con = __raw_readl(reg);
227 con &= ~(0xf << shift);
228 con |= cfg;
229 __raw_writel(con, reg);
230
231 return 0;
232}
233
234unsigned s3c_gpio_getcfg_s3c64xx_4bit(struct s3c_gpio_chip *chip,
235 unsigned int off)
236{
237 void __iomem *reg = chip->base;
238 unsigned int shift = (off & 7) * 4;
239 u32 con;
240
241 if (off < 8 && chip->chip.ngpio > 8)
242 reg -= 4;
243
244 con = __raw_readl(reg);
245 con >>= shift;
246 con &= 0xf;
247
248 /* this conversion works for IN and OUT as well as special mode */
249 return S3C_GPIO_SPECIAL(con);
250}
251
252#endif /* CONFIG_S3C_GPIO_CFG_S3C64XX */
253
254#ifdef CONFIG_S3C_GPIO_PULL_UPDOWN
255int s3c_gpio_setpull_updown(struct s3c_gpio_chip *chip,
256 unsigned int off, s3c_gpio_pull_t pull)
257{
258 void __iomem *reg = chip->base + 0x08;
259 int shift = off * 2;
260 u32 pup;
261
262 pup = __raw_readl(reg);
263 pup &= ~(3 << shift);
264 pup |= pull << shift;
265 __raw_writel(pup, reg);
266
267 return 0;
268}
269
270s3c_gpio_pull_t s3c_gpio_getpull_updown(struct s3c_gpio_chip *chip,
271 unsigned int off)
272{
273 void __iomem *reg = chip->base + 0x08;
274 int shift = off * 2;
275 u32 pup = __raw_readl(reg);
276
277 pup >>= shift;
278 pup &= 0x3;
279 return (__force s3c_gpio_pull_t)pup;
280}
281
282#ifdef CONFIG_S3C_GPIO_PULL_S3C2443
283int s3c_gpio_setpull_s3c2443(struct s3c_gpio_chip *chip,
284 unsigned int off, s3c_gpio_pull_t pull)
285{
286 switch (pull) {
287 case S3C_GPIO_PULL_NONE:
288 pull = 0x01;
289 break;
290 case S3C_GPIO_PULL_UP:
291 pull = 0x00;
292 break;
293 case S3C_GPIO_PULL_DOWN:
294 pull = 0x02;
295 break;
296 }
297 return s3c_gpio_setpull_updown(chip, off, pull);
298}
299
300s3c_gpio_pull_t s3c_gpio_getpull_s3c2443(struct s3c_gpio_chip *chip,
301 unsigned int off)
302{
303 s3c_gpio_pull_t pull;
304
305 pull = s3c_gpio_getpull_updown(chip, off);
306
307 switch (pull) {
308 case 0x00:
309 pull = S3C_GPIO_PULL_UP;
310 break;
311 case 0x01:
312 case 0x03:
313 pull = S3C_GPIO_PULL_NONE;
314 break;
315 case 0x02:
316 pull = S3C_GPIO_PULL_DOWN;
317 break;
318 }
319
320 return pull;
321}
322#endif
323#endif
324
325#if defined(CONFIG_S3C_GPIO_PULL_UP) || defined(CONFIG_S3C_GPIO_PULL_DOWN)
326static int s3c_gpio_setpull_1(struct s3c_gpio_chip *chip,
327 unsigned int off, s3c_gpio_pull_t pull,
328 s3c_gpio_pull_t updown)
329{
330 void __iomem *reg = chip->base + 0x08;
331 u32 pup = __raw_readl(reg);
332
333 if (pull == updown)
334 pup &= ~(1 << off);
335 else if (pull == S3C_GPIO_PULL_NONE)
336 pup |= (1 << off);
337 else
338 return -EINVAL;
339
340 __raw_writel(pup, reg);
341 return 0;
342}
343
344static s3c_gpio_pull_t s3c_gpio_getpull_1(struct s3c_gpio_chip *chip,
345 unsigned int off, s3c_gpio_pull_t updown)
346{
347 void __iomem *reg = chip->base + 0x08;
348 u32 pup = __raw_readl(reg);
349
350 pup &= (1 << off);
351 return pup ? S3C_GPIO_PULL_NONE : updown;
352}
353#endif /* CONFIG_S3C_GPIO_PULL_UP || CONFIG_S3C_GPIO_PULL_DOWN */
354
355#ifdef CONFIG_S3C_GPIO_PULL_UP
356s3c_gpio_pull_t s3c_gpio_getpull_1up(struct s3c_gpio_chip *chip,
357 unsigned int off)
358{
359 return s3c_gpio_getpull_1(chip, off, S3C_GPIO_PULL_UP);
360}
361
362int s3c_gpio_setpull_1up(struct s3c_gpio_chip *chip,
363 unsigned int off, s3c_gpio_pull_t pull)
364{
365 return s3c_gpio_setpull_1(chip, off, pull, S3C_GPIO_PULL_UP);
366}
367#endif /* CONFIG_S3C_GPIO_PULL_UP */
368
369#ifdef CONFIG_S3C_GPIO_PULL_DOWN
370s3c_gpio_pull_t s3c_gpio_getpull_1down(struct s3c_gpio_chip *chip,
371 unsigned int off)
372{
373 return s3c_gpio_getpull_1(chip, off, S3C_GPIO_PULL_DOWN);
374}
375
376int s3c_gpio_setpull_1down(struct s3c_gpio_chip *chip,
377 unsigned int off, s3c_gpio_pull_t pull)
378{
379 return s3c_gpio_setpull_1(chip, off, pull, S3C_GPIO_PULL_DOWN);
380}
381#endif /* CONFIG_S3C_GPIO_PULL_DOWN */
382
383#ifdef CONFIG_S5P_GPIO_DRVSTR
384s5p_gpio_drvstr_t s5p_gpio_get_drvstr(unsigned int pin)
385{
386 struct s3c_gpio_chip *chip = s3c_gpiolib_getchip(pin);
387 unsigned int off;
388 void __iomem *reg;
389 int shift;
390 u32 drvstr;
391
392 if (!chip)
393 return -EINVAL;
394
395 off = pin - chip->chip.base;
396 shift = off * 2;
397 reg = chip->base + 0x0C;
398
399 drvstr = __raw_readl(reg);
400 drvstr = drvstr >> shift;
401 drvstr &= 0x3;
402
403 return (__force s5p_gpio_drvstr_t)drvstr;
404}
405EXPORT_SYMBOL(s5p_gpio_get_drvstr);
406
407int s5p_gpio_set_drvstr(unsigned int pin, s5p_gpio_drvstr_t drvstr)
408{
409 struct s3c_gpio_chip *chip = s3c_gpiolib_getchip(pin);
410 unsigned int off;
411 void __iomem *reg;
412 int shift;
413 u32 tmp;
414
415 if (!chip)
416 return -EINVAL;
417
418 off = pin - chip->chip.base;
419 shift = off * 2;
420 reg = chip->base + 0x0C;
421
422 tmp = __raw_readl(reg);
423 tmp &= ~(0x3 << shift);
424 tmp |= drvstr << shift;
425
426 __raw_writel(tmp, reg);
427
428 return 0;
429}
430EXPORT_SYMBOL(s5p_gpio_set_drvstr);
431#endif /* CONFIG_S5P_GPIO_DRVSTR */