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kasan: enable instrumentation of global variables
[linux-2.6/btrfs-unstable.git] / drivers / gpio / gpio-samsung.c
blob7c288ba4dc87fe0ea9e6274be22d7c7719752142
1 /*
2 * Copyright (c) 2009-2011 Samsung Electronics Co., Ltd.
3 * http://www.samsung.com/
4 *
5 * Copyright 2008 Openmoko, Inc.
6 * Copyright 2008 Simtec Electronics
7 * Ben Dooks <ben@simtec.co.uk>
8 * http://armlinux.simtec.co.uk/
9 *
10 * SAMSUNG - GPIOlib support
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2 as
14 * published by the Free Software Foundation.
15 */
16
17 #include <linux/kernel.h>
18 #include <linux/irq.h>
19 #include <linux/io.h>
20 #include <linux/gpio.h>
21 #include <linux/init.h>
22 #include <linux/spinlock.h>
23 #include <linux/module.h>
24 #include <linux/interrupt.h>
25 #include <linux/device.h>
26 #include <linux/ioport.h>
27 #include <linux/of.h>
28 #include <linux/slab.h>
29 #include <linux/of_address.h>
30
31 #include <asm/irq.h>
32
33 #include <mach/map.h>
34 #include <mach/regs-gpio.h>
35 #include <mach/gpio-samsung.h>
36
37 #include <plat/cpu.h>
38 #include <plat/gpio-core.h>
39 #include <plat/gpio-cfg.h>
40 #include <plat/gpio-cfg-helpers.h>
41 #include <plat/pm.h>
42
43 int samsung_gpio_setpull_updown(struct samsung_gpio_chip *chip,
44 unsigned int off, samsung_gpio_pull_t pull)
45 {
46 void __iomem *reg = chip->base + 0x08;
47 int shift = off * 2;
48 u32 pup;
49
50 pup = __raw_readl(reg);
51 pup &= ~(3 << shift);
52 pup |= pull << shift;
53 __raw_writel(pup, reg);
54
55 return 0;
56 }
57
58 samsung_gpio_pull_t samsung_gpio_getpull_updown(struct samsung_gpio_chip *chip,
59 unsigned int off)
60 {
61 void __iomem *reg = chip->base + 0x08;
62 int shift = off * 2;
63 u32 pup = __raw_readl(reg);
64
65 pup >>= shift;
66 pup &= 0x3;
67
68 return (__force samsung_gpio_pull_t)pup;
69 }
70
71 int s3c2443_gpio_setpull(struct samsung_gpio_chip *chip,
72 unsigned int off, samsung_gpio_pull_t pull)
73 {
74 switch (pull) {
75 case S3C_GPIO_PULL_NONE:
76 pull = 0x01;
77 break;
78 case S3C_GPIO_PULL_UP:
79 pull = 0x00;
80 break;
81 case S3C_GPIO_PULL_DOWN:
82 pull = 0x02;
83 break;
84 }
85 return samsung_gpio_setpull_updown(chip, off, pull);
86 }
87
88 samsung_gpio_pull_t s3c2443_gpio_getpull(struct samsung_gpio_chip *chip,
89 unsigned int off)
90 {
91 samsung_gpio_pull_t pull;
92
93 pull = samsung_gpio_getpull_updown(chip, off);
94
95 switch (pull) {
96 case 0x00:
97 pull = S3C_GPIO_PULL_UP;
98 break;
99 case 0x01:
100 case 0x03:
101 pull = S3C_GPIO_PULL_NONE;
102 break;
103 case 0x02:
104 pull = S3C_GPIO_PULL_DOWN;
105 break;
106 }
107
108 return pull;
109 }
110
111 static int s3c24xx_gpio_setpull_1(struct samsung_gpio_chip *chip,
112 unsigned int off, samsung_gpio_pull_t pull,
113 samsung_gpio_pull_t updown)
114 {
115 void __iomem *reg = chip->base + 0x08;
116 u32 pup = __raw_readl(reg);
117
118 if (pull == updown)
119 pup &= ~(1 << off);
120 else if (pull == S3C_GPIO_PULL_NONE)
121 pup |= (1 << off);
122 else
123 return -EINVAL;
124
125 __raw_writel(pup, reg);
126 return 0;
127 }
128
129 static samsung_gpio_pull_t s3c24xx_gpio_getpull_1(struct samsung_gpio_chip *chip,
130 unsigned int off,
131 samsung_gpio_pull_t updown)
132 {
133 void __iomem *reg = chip->base + 0x08;
134 u32 pup = __raw_readl(reg);
135
136 pup &= (1 << off);
137 return pup ? S3C_GPIO_PULL_NONE : updown;
138 }
139
140 samsung_gpio_pull_t s3c24xx_gpio_getpull_1up(struct samsung_gpio_chip *chip,
141 unsigned int off)
142 {
143 return s3c24xx_gpio_getpull_1(chip, off, S3C_GPIO_PULL_UP);
144 }
145
146 int s3c24xx_gpio_setpull_1up(struct samsung_gpio_chip *chip,
147 unsigned int off, samsung_gpio_pull_t pull)
148 {
149 return s3c24xx_gpio_setpull_1(chip, off, pull, S3C_GPIO_PULL_UP);
150 }
151
152 samsung_gpio_pull_t s3c24xx_gpio_getpull_1down(struct samsung_gpio_chip *chip,
153 unsigned int off)
154 {
155 return s3c24xx_gpio_getpull_1(chip, off, S3C_GPIO_PULL_DOWN);
156 }
157
158 int s3c24xx_gpio_setpull_1down(struct samsung_gpio_chip *chip,
159 unsigned int off, samsung_gpio_pull_t pull)
160 {
161 return s3c24xx_gpio_setpull_1(chip, off, pull, S3C_GPIO_PULL_DOWN);
162 }
163
164 /*
165 * samsung_gpio_setcfg_2bit - Samsung 2bit style GPIO configuration.
166 * @chip: The gpio chip that is being configured.
167 * @off: The offset for the GPIO being configured.
168 * @cfg: The configuration value to set.
169 *
170 * This helper deal with the GPIO cases where the control register
171 * has two bits of configuration per gpio, which have the following
172 * functions:
173 * 00 = input
174 * 01 = output
175 * 1x = special function
176 */
177
178 static int samsung_gpio_setcfg_2bit(struct samsung_gpio_chip *chip,
179 unsigned int off, unsigned int cfg)
180 {
181 void __iomem *reg = chip->base;
182 unsigned int shift = off * 2;
183 u32 con;
184
185 if (samsung_gpio_is_cfg_special(cfg)) {
186 cfg &= 0xf;
187 if (cfg > 3)
188 return -EINVAL;
189
190 cfg <<= shift;
191 }
192
193 con = __raw_readl(reg);
194 con &= ~(0x3 << shift);
195 con |= cfg;
196 __raw_writel(con, reg);
197
198 return 0;
199 }
200
201 /*
202 * samsung_gpio_getcfg_2bit - Samsung 2bit style GPIO configuration read.
203 * @chip: The gpio chip that is being configured.
204 * @off: The offset for the GPIO being configured.
205 *
206 * The reverse of samsung_gpio_setcfg_2bit(). Will return a value which
207 * could be directly passed back to samsung_gpio_setcfg_2bit(), from the
208 * S3C_GPIO_SPECIAL() macro.
209 */
210
211 static unsigned int samsung_gpio_getcfg_2bit(struct samsung_gpio_chip *chip,
212 unsigned int off)
213 {
214 u32 con;
215
216 con = __raw_readl(chip->base);
217 con >>= off * 2;
218 con &= 3;
219
220 /* this conversion works for IN and OUT as well as special mode */
221 return S3C_GPIO_SPECIAL(con);
222 }
223
224 /*
225 * samsung_gpio_setcfg_4bit - Samsung 4bit single register GPIO config.
226 * @chip: The gpio chip that is being configured.
227 * @off: The offset for the GPIO being configured.
228 * @cfg: The configuration value to set.
229 *
230 * This helper deal with the GPIO cases where the control register has 4 bits
231 * of control per GPIO, generally in the form of:
232 * 0000 = Input
233 * 0001 = Output
234 * others = Special functions (dependent on bank)
235 *
236 * Note, since the code to deal with the case where there are two control
237 * registers instead of one, we do not have a separate set of functions for
238 * each case.
239 */
240
241 static int samsung_gpio_setcfg_4bit(struct samsung_gpio_chip *chip,
242 unsigned int off, unsigned int cfg)
243 {
244 void __iomem *reg = chip->base;
245 unsigned int shift = (off & 7) * 4;
246 u32 con;
247
248 if (off < 8 && chip->chip.ngpio > 8)
249 reg -= 4;
250
251 if (samsung_gpio_is_cfg_special(cfg)) {
252 cfg &= 0xf;
253 cfg <<= shift;
254 }
255
256 con = __raw_readl(reg);
257 con &= ~(0xf << shift);
258 con |= cfg;
259 __raw_writel(con, reg);
260
261 return 0;
262 }
263
264 /*
265 * samsung_gpio_getcfg_4bit - Samsung 4bit single register GPIO config read.
266 * @chip: The gpio chip that is being configured.
267 * @off: The offset for the GPIO being configured.
268 *
269 * The reverse of samsung_gpio_setcfg_4bit(), turning a gpio configuration
270 * register setting into a value the software can use, such as could be passed
271 * to samsung_gpio_setcfg_4bit().
272 *
273 * @sa samsung_gpio_getcfg_2bit
274 */
275
276 static unsigned samsung_gpio_getcfg_4bit(struct samsung_gpio_chip *chip,
277 unsigned int off)
278 {
279 void __iomem *reg = chip->base;
280 unsigned int shift = (off & 7) * 4;
281 u32 con;
282
283 if (off < 8 && chip->chip.ngpio > 8)
284 reg -= 4;
285
286 con = __raw_readl(reg);
287 con >>= shift;
288 con &= 0xf;
289
290 /* this conversion works for IN and OUT as well as special mode */
291 return S3C_GPIO_SPECIAL(con);
292 }
293
294 #ifdef CONFIG_PLAT_S3C24XX
295 /*
296 * s3c24xx_gpio_setcfg_abank - S3C24XX style GPIO configuration (Bank A)
297 * @chip: The gpio chip that is being configured.
298 * @off: The offset for the GPIO being configured.
299 * @cfg: The configuration value to set.
300 *
301 * This helper deal with the GPIO cases where the control register
302 * has one bit of configuration for the gpio, where setting the bit
303 * means the pin is in special function mode and unset means output.
304 */
305
306 static int s3c24xx_gpio_setcfg_abank(struct samsung_gpio_chip *chip,
307 unsigned int off, unsigned int cfg)
308 {
309 void __iomem *reg = chip->base;
310 unsigned int shift = off;
311 u32 con;
312
313 if (samsung_gpio_is_cfg_special(cfg)) {
314 cfg &= 0xf;
315
316 /* Map output to 0, and SFN2 to 1 */
317 cfg -= 1;
318 if (cfg > 1)
319 return -EINVAL;
320
321 cfg <<= shift;
322 }
323
324 con = __raw_readl(reg);
325 con &= ~(0x1 << shift);
326 con |= cfg;
327 __raw_writel(con, reg);
328
329 return 0;
330 }
331
332 /*
333 * s3c24xx_gpio_getcfg_abank - S3C24XX style GPIO configuration read (Bank A)
334 * @chip: The gpio chip that is being configured.
335 * @off: The offset for the GPIO being configured.
336 *
337 * The reverse of s3c24xx_gpio_setcfg_abank() turning an GPIO into a usable
338 * GPIO configuration value.
339 *
340 * @sa samsung_gpio_getcfg_2bit
341 * @sa samsung_gpio_getcfg_4bit
342 */
343
344 static unsigned s3c24xx_gpio_getcfg_abank(struct samsung_gpio_chip *chip,
345 unsigned int off)
346 {
347 u32 con;
348
349 con = __raw_readl(chip->base);
350 con >>= off;
351 con &= 1;
352 con++;
353
354 return S3C_GPIO_SFN(con);
355 }
356 #endif
357
358 static void __init samsung_gpiolib_set_cfg(struct samsung_gpio_cfg *chipcfg,
359 int nr_chips)
360 {
361 for (; nr_chips > 0; nr_chips--, chipcfg++) {
362 if (!chipcfg->set_config)
363 chipcfg->set_config = samsung_gpio_setcfg_4bit;
364 if (!chipcfg->get_config)
365 chipcfg->get_config = samsung_gpio_getcfg_4bit;
366 if (!chipcfg->set_pull)
367 chipcfg->set_pull = samsung_gpio_setpull_updown;
368 if (!chipcfg->get_pull)
369 chipcfg->get_pull = samsung_gpio_getpull_updown;
370 }
371 }
372
373 struct samsung_gpio_cfg s3c24xx_gpiocfg_default = {
374 .set_config = samsung_gpio_setcfg_2bit,
375 .get_config = samsung_gpio_getcfg_2bit,
376 };
377
378 #ifdef CONFIG_PLAT_S3C24XX
379 static struct samsung_gpio_cfg s3c24xx_gpiocfg_banka = {
380 .set_config = s3c24xx_gpio_setcfg_abank,
381 .get_config = s3c24xx_gpio_getcfg_abank,
382 };
383 #endif
384
385 static struct samsung_gpio_cfg samsung_gpio_cfgs[] = {
386 [0] = {
387 .cfg_eint = 0x0,
388 },
389 [1] = {
390 .cfg_eint = 0x3,
391 },
392 [2] = {
393 .cfg_eint = 0x7,
394 },
395 [3] = {
396 .cfg_eint = 0xF,
397 },
398 [4] = {
399 .cfg_eint = 0x0,
400 .set_config = samsung_gpio_setcfg_2bit,
401 .get_config = samsung_gpio_getcfg_2bit,
402 },
403 [5] = {
404 .cfg_eint = 0x2,
405 .set_config = samsung_gpio_setcfg_2bit,
406 .get_config = samsung_gpio_getcfg_2bit,
407 },
408 [6] = {
409 .cfg_eint = 0x3,
410 .set_config = samsung_gpio_setcfg_2bit,
411 .get_config = samsung_gpio_getcfg_2bit,
412 },
413 [7] = {
414 .set_config = samsung_gpio_setcfg_2bit,
415 .get_config = samsung_gpio_getcfg_2bit,
416 },
417 };
418
419 /*
420 * Default routines for controlling GPIO, based on the original S3C24XX
421 * GPIO functions which deal with the case where each gpio bank of the
422 * chip is as following:
423 *
424 * base + 0x00: Control register, 2 bits per gpio
425 * gpio n: 2 bits starting at (2*n)
426 * 00 = input, 01 = output, others mean special-function
427 * base + 0x04: Data register, 1 bit per gpio
428 * bit n: data bit n
429 */
430
431 static int samsung_gpiolib_2bit_input(struct gpio_chip *chip, unsigned offset)
432 {
433 struct samsung_gpio_chip *ourchip = to_samsung_gpio(chip);
434 void __iomem *base = ourchip->base;
435 unsigned long flags;
436 unsigned long con;
437
438 samsung_gpio_lock(ourchip, flags);
439
440 con = __raw_readl(base + 0x00);
441 con &= ~(3 << (offset * 2));
442
443 __raw_writel(con, base + 0x00);
444
445 samsung_gpio_unlock(ourchip, flags);
446 return 0;
447 }
448
449 static int samsung_gpiolib_2bit_output(struct gpio_chip *chip,
450 unsigned offset, int value)
451 {
452 struct samsung_gpio_chip *ourchip = to_samsung_gpio(chip);
453 void __iomem *base = ourchip->base;
454 unsigned long flags;
455 unsigned long dat;
456 unsigned long con;
457
458 samsung_gpio_lock(ourchip, flags);
459
460 dat = __raw_readl(base + 0x04);
461 dat &= ~(1 << offset);
462 if (value)
463 dat |= 1 << offset;
464 __raw_writel(dat, base + 0x04);
465
466 con = __raw_readl(base + 0x00);
467 con &= ~(3 << (offset * 2));
468 con |= 1 << (offset * 2);
469
470 __raw_writel(con, base + 0x00);
471 __raw_writel(dat, base + 0x04);
472
473 samsung_gpio_unlock(ourchip, flags);
474 return 0;
475 }
476
477 /*
478 * The samsung_gpiolib_4bit routines are to control the gpio banks where
479 * the gpio configuration register (GPxCON) has 4 bits per GPIO, as the
480 * following example:
481 *
482 * base + 0x00: Control register, 4 bits per gpio
483 * gpio n: 4 bits starting at (4*n)
484 * 0000 = input, 0001 = output, others mean special-function
485 * base + 0x04: Data register, 1 bit per gpio
486 * bit n: data bit n
487 *
488 * Note, since the data register is one bit per gpio and is at base + 0x4
489 * we can use samsung_gpiolib_get and samsung_gpiolib_set to change the
490 * state of the output.
491 */
492
493 static int samsung_gpiolib_4bit_input(struct gpio_chip *chip,
494 unsigned int offset)
495 {
496 struct samsung_gpio_chip *ourchip = to_samsung_gpio(chip);
497 void __iomem *base = ourchip->base;
498 unsigned long con;
499
500 con = __raw_readl(base + GPIOCON_OFF);
501 if (ourchip->bitmap_gpio_int & BIT(offset))
502 con |= 0xf << con_4bit_shift(offset);
503 else
504 con &= ~(0xf << con_4bit_shift(offset));
505 __raw_writel(con, base + GPIOCON_OFF);
506
507 pr_debug("%s: %p: CON now %08lx\n", __func__, base, con);
508
509 return 0;
510 }
511
512 static int samsung_gpiolib_4bit_output(struct gpio_chip *chip,
513 unsigned int offset, int value)
514 {
515 struct samsung_gpio_chip *ourchip = to_samsung_gpio(chip);
516 void __iomem *base = ourchip->base;
517 unsigned long con;
518 unsigned long dat;
519
520 con = __raw_readl(base + GPIOCON_OFF);
521 con &= ~(0xf << con_4bit_shift(offset));
522 con |= 0x1 << con_4bit_shift(offset);
523
524 dat = __raw_readl(base + GPIODAT_OFF);
525
526 if (value)
527 dat |= 1 << offset;
528 else
529 dat &= ~(1 << offset);
530
531 __raw_writel(dat, base + GPIODAT_OFF);
532 __raw_writel(con, base + GPIOCON_OFF);
533 __raw_writel(dat, base + GPIODAT_OFF);
534
535 pr_debug("%s: %p: CON %08lx, DAT %08lx\n", __func__, base, con, dat);
536
537 return 0;
538 }
539
540 /*
541 * The next set of routines are for the case where the GPIO configuration
542 * registers are 4 bits per GPIO but there is more than one register (the
543 * bank has more than 8 GPIOs.
544 *
545 * This case is the similar to the 4 bit case, but the registers are as
546 * follows:
547 *
548 * base + 0x00: Control register, 4 bits per gpio (lower 8 GPIOs)
549 * gpio n: 4 bits starting at (4*n)
550 * 0000 = input, 0001 = output, others mean special-function
551 * base + 0x04: Control register, 4 bits per gpio (up to 8 additions GPIOs)
552 * gpio n: 4 bits starting at (4*n)
553 * 0000 = input, 0001 = output, others mean special-function
554 * base + 0x08: Data register, 1 bit per gpio
555 * bit n: data bit n
556 *
557 * To allow us to use the samsung_gpiolib_get and samsung_gpiolib_set
558 * routines we store the 'base + 0x4' address so that these routines see
559 * the data register at ourchip->base + 0x04.
560 */
561
562 static int samsung_gpiolib_4bit2_input(struct gpio_chip *chip,
563 unsigned int offset)
564 {
565 struct samsung_gpio_chip *ourchip = to_samsung_gpio(chip);
566 void __iomem *base = ourchip->base;
567 void __iomem *regcon = base;
568 unsigned long con;
569
570 if (offset > 7)
571 offset -= 8;
572 else
573 regcon -= 4;
574
575 con = __raw_readl(regcon);
576 con &= ~(0xf << con_4bit_shift(offset));
577 __raw_writel(con, regcon);
578
579 pr_debug("%s: %p: CON %08lx\n", __func__, base, con);
580
581 return 0;
582 }
583
584 static int samsung_gpiolib_4bit2_output(struct gpio_chip *chip,
585 unsigned int offset, int value)
586 {
587 struct samsung_gpio_chip *ourchip = to_samsung_gpio(chip);
588 void __iomem *base = ourchip->base;
589 void __iomem *regcon = base;
590 unsigned long con;
591 unsigned long dat;
592 unsigned con_offset = offset;
593
594 if (con_offset > 7)
595 con_offset -= 8;
596 else
597 regcon -= 4;
598
599 con = __raw_readl(regcon);
600 con &= ~(0xf << con_4bit_shift(con_offset));
601 con |= 0x1 << con_4bit_shift(con_offset);
602
603 dat = __raw_readl(base + GPIODAT_OFF);
604
605 if (value)
606 dat |= 1 << offset;
607 else
608 dat &= ~(1 << offset);
609
610 __raw_writel(dat, base + GPIODAT_OFF);
611 __raw_writel(con, regcon);
612 __raw_writel(dat, base + GPIODAT_OFF);
613
614 pr_debug("%s: %p: CON %08lx, DAT %08lx\n", __func__, base, con, dat);
615
616 return 0;
617 }
618
619 #ifdef CONFIG_PLAT_S3C24XX
620 /* The next set of routines are for the case of s3c24xx bank a */
621
622 static int s3c24xx_gpiolib_banka_input(struct gpio_chip *chip, unsigned offset)
623 {
624 return -EINVAL;
625 }
626
627 static int s3c24xx_gpiolib_banka_output(struct gpio_chip *chip,
628 unsigned offset, int value)
629 {
630 struct samsung_gpio_chip *ourchip = to_samsung_gpio(chip);
631 void __iomem *base = ourchip->base;
632 unsigned long flags;
633 unsigned long dat;
634 unsigned long con;
635
636 local_irq_save(flags);
637
638 con = __raw_readl(base + 0x00);
639 dat = __raw_readl(base + 0x04);
640
641 dat &= ~(1 << offset);
642 if (value)
643 dat |= 1 << offset;
644
645 __raw_writel(dat, base + 0x04);
646
647 con &= ~(1 << offset);
648
649 __raw_writel(con, base + 0x00);
650 __raw_writel(dat, base + 0x04);
651
652 local_irq_restore(flags);
653 return 0;
654 }
655 #endif
656
657 static void samsung_gpiolib_set(struct gpio_chip *chip,
658 unsigned offset, int value)
659 {
660 struct samsung_gpio_chip *ourchip = to_samsung_gpio(chip);
661 void __iomem *base = ourchip->base;
662 unsigned long flags;
663 unsigned long dat;
664
665 samsung_gpio_lock(ourchip, flags);
666
667 dat = __raw_readl(base + 0x04);
668 dat &= ~(1 << offset);
669 if (value)
670 dat |= 1 << offset;
671 __raw_writel(dat, base + 0x04);
672
673 samsung_gpio_unlock(ourchip, flags);
674 }
675
676 static int samsung_gpiolib_get(struct gpio_chip *chip, unsigned offset)
677 {
678 struct samsung_gpio_chip *ourchip = to_samsung_gpio(chip);
679 unsigned long val;
680
681 val = __raw_readl(ourchip->base + 0x04);
682 val >>= offset;
683 val &= 1;
684
685 return val;
686 }
687
688 /*
689 * CONFIG_S3C_GPIO_TRACK enables the tracking of the s3c specific gpios
690 * for use with the configuration calls, and other parts of the s3c gpiolib
691 * support code.
692 *
693 * Not all s3c support code will need this, as some configurations of cpu
694 * may only support one or two different configuration options and have an
695 * easy gpio to samsung_gpio_chip mapping function. If this is the case, then
696 * the machine support file should provide its own samsung_gpiolib_getchip()
697 * and any other necessary functions.
698 */
699
700 #ifdef CONFIG_S3C_GPIO_TRACK
701 struct samsung_gpio_chip *s3c_gpios[S3C_GPIO_END];
702
703 static __init void s3c_gpiolib_track(struct samsung_gpio_chip *chip)
704 {
705 unsigned int gpn;
706 int i;
707
708 gpn = chip->chip.base;
709 for (i = 0; i < chip->chip.ngpio; i++, gpn++) {
710 BUG_ON(gpn >= ARRAY_SIZE(s3c_gpios));
711 s3c_gpios[gpn] = chip;
712 }
713 }
714 #endif /* CONFIG_S3C_GPIO_TRACK */
715
716 /*
717 * samsung_gpiolib_add() - add the Samsung gpio_chip.
718 * @chip: The chip to register
719 *
720 * This is a wrapper to gpiochip_add() that takes our specific gpio chip
721 * information and makes the necessary alterations for the platform and
722 * notes the information for use with the configuration systems and any
723 * other parts of the system.
724 */
725
726 static void __init samsung_gpiolib_add(struct samsung_gpio_chip *chip)
727 {
728 struct gpio_chip *gc = &chip->chip;
729 int ret;
730
731 BUG_ON(!chip->base);
732 BUG_ON(!gc->label);
733 BUG_ON(!gc->ngpio);
734
735 spin_lock_init(&chip->lock);
736
737 if (!gc->direction_input)
738 gc->direction_input = samsung_gpiolib_2bit_input;
739 if (!gc->direction_output)
740 gc->direction_output = samsung_gpiolib_2bit_output;
741 if (!gc->set)
742 gc->set = samsung_gpiolib_set;
743 if (!gc->get)
744 gc->get = samsung_gpiolib_get;
745
746 #ifdef CONFIG_PM
747 if (chip->pm != NULL) {
748 if (!chip->pm->save || !chip->pm->resume)
749 pr_err("gpio: %s has missing PM functions\n",
750 gc->label);
751 } else
752 pr_err("gpio: %s has no PM function\n", gc->label);
753 #endif
754
755 /* gpiochip_add() prints own failure message on error. */
756 ret = gpiochip_add(gc);
757 if (ret >= 0)
758 s3c_gpiolib_track(chip);
759 }
760
761 static void __init s3c24xx_gpiolib_add_chips(struct samsung_gpio_chip *chip,
762 int nr_chips, void __iomem *base)
763 {
764 int i;
765 struct gpio_chip *gc = &chip->chip;
766
767 for (i = 0 ; i < nr_chips; i++, chip++) {
768 /* skip banks not present on SoC */
769 if (chip->chip.base >= S3C_GPIO_END)
770 continue;
771
772 if (!chip->config)
773 chip->config = &s3c24xx_gpiocfg_default;
774 if (!chip->pm)
775 chip->pm = __gpio_pm(&samsung_gpio_pm_2bit);
776 if ((base != NULL) && (chip->base == NULL))
777 chip->base = base + ((i) * 0x10);
778
779 if (!gc->direction_input)
780 gc->direction_input = samsung_gpiolib_2bit_input;
781 if (!gc->direction_output)
782 gc->direction_output = samsung_gpiolib_2bit_output;
783
784 samsung_gpiolib_add(chip);
785 }
786 }
787
788 static void __init samsung_gpiolib_add_2bit_chips(struct samsung_gpio_chip *chip,
789 int nr_chips, void __iomem *base,
790 unsigned int offset)
791 {
792 int i;
793
794 for (i = 0 ; i < nr_chips; i++, chip++) {
795 chip->chip.direction_input = samsung_gpiolib_2bit_input;
796 chip->chip.direction_output = samsung_gpiolib_2bit_output;
797
798 if (!chip->config)
799 chip->config = &samsung_gpio_cfgs[7];
800 if (!chip->pm)
801 chip->pm = __gpio_pm(&samsung_gpio_pm_2bit);
802 if ((base != NULL) && (chip->base == NULL))
803 chip->base = base + ((i) * offset);
804
805 samsung_gpiolib_add(chip);
806 }
807 }
808
809 /*
810 * samsung_gpiolib_add_4bit_chips - 4bit single register GPIO config.
811 * @chip: The gpio chip that is being configured.
812 * @nr_chips: The no of chips (gpio ports) for the GPIO being configured.
813 *
814 * This helper deal with the GPIO cases where the control register has 4 bits
815 * of control per GPIO, generally in the form of:
816 * 0000 = Input
817 * 0001 = Output
818 * others = Special functions (dependent on bank)
819 *
820 * Note, since the code to deal with the case where there are two control
821 * registers instead of one, we do not have a separate set of function
822 * (samsung_gpiolib_add_4bit2_chips)for each case.
823 */
824
825 static void __init samsung_gpiolib_add_4bit_chips(struct samsung_gpio_chip *chip,
826 int nr_chips, void __iomem *base)
827 {
828 int i;
829
830 for (i = 0 ; i < nr_chips; i++, chip++) {
831 chip->chip.direction_input = samsung_gpiolib_4bit_input;
832 chip->chip.direction_output = samsung_gpiolib_4bit_output;
833
834 if (!chip->config)
835 chip->config = &samsung_gpio_cfgs[2];
836 if (!chip->pm)
837 chip->pm = __gpio_pm(&samsung_gpio_pm_4bit);
838 if ((base != NULL) && (chip->base == NULL))
839 chip->base = base + ((i) * 0x20);
840
841 chip->bitmap_gpio_int = 0;
842
843 samsung_gpiolib_add(chip);
844 }
845 }
846
847 static void __init samsung_gpiolib_add_4bit2_chips(struct samsung_gpio_chip *chip,
848 int nr_chips)
849 {
850 for (; nr_chips > 0; nr_chips--, chip++) {
851 chip->chip.direction_input = samsung_gpiolib_4bit2_input;
852 chip->chip.direction_output = samsung_gpiolib_4bit2_output;
853
854 if (!chip->config)
855 chip->config = &samsung_gpio_cfgs[2];
856 if (!chip->pm)
857 chip->pm = __gpio_pm(&samsung_gpio_pm_4bit);
858
859 samsung_gpiolib_add(chip);
860 }
861 }
862
863 int samsung_gpiolib_to_irq(struct gpio_chip *chip, unsigned int offset)
864 {
865 struct samsung_gpio_chip *samsung_chip = container_of(chip, struct samsung_gpio_chip, chip);
866
867 return samsung_chip->irq_base + offset;
868 }
869
870 #ifdef CONFIG_PLAT_S3C24XX
871 static int s3c24xx_gpiolib_fbank_to_irq(struct gpio_chip *chip, unsigned offset)
872 {
873 if (offset < 4) {
874 if (soc_is_s3c2412())
875 return IRQ_EINT0_2412 + offset;
876 else
877 return IRQ_EINT0 + offset;
878 }
879
880 if (offset < 8)
881 return IRQ_EINT4 + offset - 4;
882
883 return -EINVAL;
884 }
885 #endif
886
887 #ifdef CONFIG_ARCH_S3C64XX
888 static int s3c64xx_gpiolib_mbank_to_irq(struct gpio_chip *chip, unsigned pin)
889 {
890 return pin < 5 ? IRQ_EINT(23) + pin : -ENXIO;
891 }
892
893 static int s3c64xx_gpiolib_lbank_to_irq(struct gpio_chip *chip, unsigned pin)
894 {
895 return pin >= 8 ? IRQ_EINT(16) + pin - 8 : -ENXIO;
896 }
897 #endif
898
899 struct samsung_gpio_chip s3c24xx_gpios[] = {
900 #ifdef CONFIG_PLAT_S3C24XX
901 {
902 .config = &s3c24xx_gpiocfg_banka,
903 .chip = {
904 .base = S3C2410_GPA(0),
905 .owner = THIS_MODULE,
906 .label = "GPIOA",
907 .ngpio = 27,
908 .direction_input = s3c24xx_gpiolib_banka_input,
909 .direction_output = s3c24xx_gpiolib_banka_output,
910 },
911 }, {
912 .chip = {
913 .base = S3C2410_GPB(0),
914 .owner = THIS_MODULE,
915 .label = "GPIOB",
916 .ngpio = 11,
917 },
918 }, {
919 .chip = {
920 .base = S3C2410_GPC(0),
921 .owner = THIS_MODULE,
922 .label = "GPIOC",
923 .ngpio = 16,
924 },
925 }, {
926 .chip = {
927 .base = S3C2410_GPD(0),
928 .owner = THIS_MODULE,
929 .label = "GPIOD",
930 .ngpio = 16,
931 },
932 }, {
933 .chip = {
934 .base = S3C2410_GPE(0),
935 .label = "GPIOE",
936 .owner = THIS_MODULE,
937 .ngpio = 16,
938 },
939 }, {
940 .chip = {
941 .base = S3C2410_GPF(0),
942 .owner = THIS_MODULE,
943 .label = "GPIOF",
944 .ngpio = 8,
945 .to_irq = s3c24xx_gpiolib_fbank_to_irq,
946 },
947 }, {
948 .irq_base = IRQ_EINT8,
949 .chip = {
950 .base = S3C2410_GPG(0),
951 .owner = THIS_MODULE,
952 .label = "GPIOG",
953 .ngpio = 16,
954 .to_irq = samsung_gpiolib_to_irq,
955 },
956 }, {
957 .chip = {
958 .base = S3C2410_GPH(0),
959 .owner = THIS_MODULE,
960 .label = "GPIOH",
961 .ngpio = 15,
962 },
963 },
964 /* GPIOS for the S3C2443 and later devices. */
965 {
966 .base = S3C2440_GPJCON,
967 .chip = {
968 .base = S3C2410_GPJ(0),
969 .owner = THIS_MODULE,
970 .label = "GPIOJ",
971 .ngpio = 16,
972 },
973 }, {
974 .base = S3C2443_GPKCON,
975 .chip = {
976 .base = S3C2410_GPK(0),
977 .owner = THIS_MODULE,
978 .label = "GPIOK",
979 .ngpio = 16,
980 },
981 }, {
982 .base = S3C2443_GPLCON,
983 .chip = {
984 .base = S3C2410_GPL(0),
985 .owner = THIS_MODULE,
986 .label = "GPIOL",
987 .ngpio = 15,
988 },
989 }, {
990 .base = S3C2443_GPMCON,
991 .chip = {
992 .base = S3C2410_GPM(0),
993 .owner = THIS_MODULE,
994 .label = "GPIOM",
995 .ngpio = 2,
996 },
997 },
998 #endif
999 };
1000
1001 /*
1002 * GPIO bank summary:
1003 *
1004 * Bank GPIOs Style SlpCon ExtInt Group
1005 * A 8 4Bit Yes 1
1006 * B 7 4Bit Yes 1
1007 * C 8 4Bit Yes 2
1008 * D 5 4Bit Yes 3
1009 * E 5 4Bit Yes None
1010 * F 16 2Bit Yes 4 [1]
1011 * G 7 4Bit Yes 5
1012 * H 10 4Bit[2] Yes 6
1013 * I 16 2Bit Yes None
1014 * J 12 2Bit Yes None
1015 * K 16 4Bit[2] No None
1016 * L 15 4Bit[2] No None
1017 * M 6 4Bit No IRQ_EINT
1018 * N 16 2Bit No IRQ_EINT
1019 * O 16 2Bit Yes 7
1020 * P 15 2Bit Yes 8
1021 * Q 9 2Bit Yes 9
1022 *
1023 * [1] BANKF pins 14,15 do not form part of the external interrupt sources
1024 * [2] BANK has two control registers, GPxCON0 and GPxCON1
1025 */
1026
1027 static struct samsung_gpio_chip s3c64xx_gpios_4bit[] = {
1028 #ifdef CONFIG_ARCH_S3C64XX
1029 {
1030 .chip = {
1031 .base = S3C64XX_GPA(0),
1032 .ngpio = S3C64XX_GPIO_A_NR,
1033 .label = "GPA",
1034 },
1035 }, {
1036 .chip = {
1037 .base = S3C64XX_GPB(0),
1038 .ngpio = S3C64XX_GPIO_B_NR,
1039 .label = "GPB",
1040 },
1041 }, {
1042 .chip = {
1043 .base = S3C64XX_GPC(0),
1044 .ngpio = S3C64XX_GPIO_C_NR,
1045 .label = "GPC",
1046 },
1047 }, {
1048 .chip = {
1049 .base = S3C64XX_GPD(0),
1050 .ngpio = S3C64XX_GPIO_D_NR,
1051 .label = "GPD",
1052 },
1053 }, {
1054 .config = &samsung_gpio_cfgs[0],
1055 .chip = {
1056 .base = S3C64XX_GPE(0),
1057 .ngpio = S3C64XX_GPIO_E_NR,
1058 .label = "GPE",
1059 },
1060 }, {
1061 .base = S3C64XX_GPG_BASE,
1062 .chip = {
1063 .base = S3C64XX_GPG(0),
1064 .ngpio = S3C64XX_GPIO_G_NR,
1065 .label = "GPG",
1066 },
1067 }, {
1068 .base = S3C64XX_GPM_BASE,
1069 .config = &samsung_gpio_cfgs[1],
1070 .chip = {
1071 .base = S3C64XX_GPM(0),
1072 .ngpio = S3C64XX_GPIO_M_NR,
1073 .label = "GPM",
1074 .to_irq = s3c64xx_gpiolib_mbank_to_irq,
1075 },
1076 },
1077 #endif
1078 };
1079
1080 static struct samsung_gpio_chip s3c64xx_gpios_4bit2[] = {
1081 #ifdef CONFIG_ARCH_S3C64XX
1082 {
1083 .base = S3C64XX_GPH_BASE + 0x4,
1084 .chip = {
1085 .base = S3C64XX_GPH(0),
1086 .ngpio = S3C64XX_GPIO_H_NR,
1087 .label = "GPH",
1088 },
1089 }, {
1090 .base = S3C64XX_GPK_BASE + 0x4,
1091 .config = &samsung_gpio_cfgs[0],
1092 .chip = {
1093 .base = S3C64XX_GPK(0),
1094 .ngpio = S3C64XX_GPIO_K_NR,
1095 .label = "GPK",
1096 },
1097 }, {
1098 .base = S3C64XX_GPL_BASE + 0x4,
1099 .config = &samsung_gpio_cfgs[1],
1100 .chip = {
1101 .base = S3C64XX_GPL(0),
1102 .ngpio = S3C64XX_GPIO_L_NR,
1103 .label = "GPL",
1104 .to_irq = s3c64xx_gpiolib_lbank_to_irq,
1105 },
1106 },
1107 #endif
1108 };
1109
1110 static struct samsung_gpio_chip s3c64xx_gpios_2bit[] = {
1111 #ifdef CONFIG_ARCH_S3C64XX
1112 {
1113 .base = S3C64XX_GPF_BASE,
1114 .config = &samsung_gpio_cfgs[6],
1115 .chip = {
1116 .base = S3C64XX_GPF(0),
1117 .ngpio = S3C64XX_GPIO_F_NR,
1118 .label = "GPF",
1119 },
1120 }, {
1121 .config = &samsung_gpio_cfgs[7],
1122 .chip = {
1123 .base = S3C64XX_GPI(0),
1124 .ngpio = S3C64XX_GPIO_I_NR,
1125 .label = "GPI",
1126 },
1127 }, {
1128 .config = &samsung_gpio_cfgs[7],
1129 .chip = {
1130 .base = S3C64XX_GPJ(0),
1131 .ngpio = S3C64XX_GPIO_J_NR,
1132 .label = "GPJ",
1133 },
1134 }, {
1135 .config = &samsung_gpio_cfgs[6],
1136 .chip = {
1137 .base = S3C64XX_GPO(0),
1138 .ngpio = S3C64XX_GPIO_O_NR,
1139 .label = "GPO",
1140 },
1141 }, {
1142 .config = &samsung_gpio_cfgs[6],
1143 .chip = {
1144 .base = S3C64XX_GPP(0),
1145 .ngpio = S3C64XX_GPIO_P_NR,
1146 .label = "GPP",
1147 },
1148 }, {
1149 .config = &samsung_gpio_cfgs[6],
1150 .chip = {
1151 .base = S3C64XX_GPQ(0),
1152 .ngpio = S3C64XX_GPIO_Q_NR,
1153 .label = "GPQ",
1154 },
1155 }, {
1156 .base = S3C64XX_GPN_BASE,
1157 .irq_base = IRQ_EINT(0),
1158 .config = &samsung_gpio_cfgs[5],
1159 .chip = {
1160 .base = S3C64XX_GPN(0),
1161 .ngpio = S3C64XX_GPIO_N_NR,
1162 .label = "GPN",
1163 .to_irq = samsung_gpiolib_to_irq,
1164 },
1165 },
1166 #endif
1167 };
1168
1169 /* TODO: cleanup soc_is_* */
1170 static __init int samsung_gpiolib_init(void)
1171 {
1172 /*
1173 * Currently there are two drivers that can provide GPIO support for
1174 * Samsung SoCs. For device tree enabled platforms, the new
1175 * pinctrl-samsung driver is used, providing both GPIO and pin control
1176 * interfaces. For legacy (non-DT) platforms this driver is used.
1177 */
1178 if (of_have_populated_dt())
1179 return -ENODEV;
1180
1181 samsung_gpiolib_set_cfg(samsung_gpio_cfgs, ARRAY_SIZE(samsung_gpio_cfgs));
1182
1183 if (soc_is_s3c24xx()) {
1184 s3c24xx_gpiolib_add_chips(s3c24xx_gpios,
1185 ARRAY_SIZE(s3c24xx_gpios), S3C24XX_VA_GPIO);
1186 } else if (soc_is_s3c64xx()) {
1187 samsung_gpiolib_add_2bit_chips(s3c64xx_gpios_2bit,
1188 ARRAY_SIZE(s3c64xx_gpios_2bit),
1189 S3C64XX_VA_GPIO + 0xE0, 0x20);
1190 samsung_gpiolib_add_4bit_chips(s3c64xx_gpios_4bit,
1191 ARRAY_SIZE(s3c64xx_gpios_4bit),
1192 S3C64XX_VA_GPIO);
1193 samsung_gpiolib_add_4bit2_chips(s3c64xx_gpios_4bit2,
1194 ARRAY_SIZE(s3c64xx_gpios_4bit2));
1195 } else {
1196 WARN(1, "Unknown SoC in gpio-samsung, no GPIOs added\n");
1197 return -ENODEV;
1198 }
1199
1200 return 0;
1201 }
1202 core_initcall(samsung_gpiolib_init);
1203
1204 int s3c_gpio_cfgpin(unsigned int pin, unsigned int config)
1205 {
1206 struct samsung_gpio_chip *chip = samsung_gpiolib_getchip(pin);
1207 unsigned long flags;
1208 int offset;
1209 int ret;
1210
1211 if (!chip)
1212 return -EINVAL;
1213
1214 offset = pin - chip->chip.base;
1215
1216 samsung_gpio_lock(chip, flags);
1217 ret = samsung_gpio_do_setcfg(chip, offset, config);
1218 samsung_gpio_unlock(chip, flags);
1219
1220 return ret;
1221 }
1222 EXPORT_SYMBOL(s3c_gpio_cfgpin);
1223
1224 int s3c_gpio_cfgpin_range(unsigned int start, unsigned int nr,
1225 unsigned int cfg)
1226 {
1227 int ret;
1228
1229 for (; nr > 0; nr--, start++) {
1230 ret = s3c_gpio_cfgpin(start, cfg);
1231 if (ret != 0)
1232 return ret;
1233 }
1234
1235 return 0;
1236 }
1237 EXPORT_SYMBOL_GPL(s3c_gpio_cfgpin_range);
1238
1239 int s3c_gpio_cfgall_range(unsigned int start, unsigned int nr,
1240 unsigned int cfg, samsung_gpio_pull_t pull)
1241 {
1242 int ret;
1243
1244 for (; nr > 0; nr--, start++) {
1245 s3c_gpio_setpull(start, pull);
1246 ret = s3c_gpio_cfgpin(start, cfg);
1247 if (ret != 0)
1248 return ret;
1249 }
1250
1251 return 0;
1252 }
1253 EXPORT_SYMBOL_GPL(s3c_gpio_cfgall_range);
1254
1255 unsigned s3c_gpio_getcfg(unsigned int pin)
1256 {
1257 struct samsung_gpio_chip *chip = samsung_gpiolib_getchip(pin);
1258 unsigned long flags;
1259 unsigned ret = 0;
1260 int offset;
1261
1262 if (chip) {
1263 offset = pin - chip->chip.base;
1264
1265 samsung_gpio_lock(chip, flags);
1266 ret = samsung_gpio_do_getcfg(chip, offset);
1267 samsung_gpio_unlock(chip, flags);
1268 }
1269
1270 return ret;
1271 }
1272 EXPORT_SYMBOL(s3c_gpio_getcfg);
1273
1274 int s3c_gpio_setpull(unsigned int pin, samsung_gpio_pull_t pull)
1275 {
1276 struct samsung_gpio_chip *chip = samsung_gpiolib_getchip(pin);
1277 unsigned long flags;
1278 int offset, ret;
1279
1280 if (!chip)
1281 return -EINVAL;
1282
1283 offset = pin - chip->chip.base;
1284
1285 samsung_gpio_lock(chip, flags);
1286 ret = samsung_gpio_do_setpull(chip, offset, pull);
1287 samsung_gpio_unlock(chip, flags);
1288
1289 return ret;
1290 }
1291 EXPORT_SYMBOL(s3c_gpio_setpull);
1292
1293 samsung_gpio_pull_t s3c_gpio_getpull(unsigned int pin)
1294 {
1295 struct samsung_gpio_chip *chip = samsung_gpiolib_getchip(pin);
1296 unsigned long flags;
1297 int offset;
1298 u32 pup = 0;
1299
1300 if (chip) {
1301 offset = pin - chip->chip.base;
1302
1303 samsung_gpio_lock(chip, flags);
1304 pup = samsung_gpio_do_getpull(chip, offset);
1305 samsung_gpio_unlock(chip, flags);
1306 }
1307
1308 return (__force samsung_gpio_pull_t)pup;
1309 }
1310 EXPORT_SYMBOL(s3c_gpio_getpull);
1311
1312 #ifdef CONFIG_PLAT_S3C24XX
1313 unsigned int s3c2410_modify_misccr(unsigned int clear, unsigned int change)
1314 {
1315 unsigned long flags;
1316 unsigned long misccr;
1317
1318 local_irq_save(flags);
1319 misccr = __raw_readl(S3C24XX_MISCCR);
1320 misccr &= ~clear;
1321 misccr ^= change;
1322 __raw_writel(misccr, S3C24XX_MISCCR);
1323 local_irq_restore(flags);
1324
1325 return misccr;
1326 }
1327 EXPORT_SYMBOL(s3c2410_modify_misccr);
1328 #endif
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