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Merge tag 'staging-4.5-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh...
[deliverable/linux.git] / arch / arm / plat-samsung / gpio-samsung.c
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/irqs.h>
34 #include <mach/map.h>
35 #include <mach/regs-gpio.h>
36 #include <mach/gpio-samsung.h>
37
38 #include <plat/cpu.h>
39 #include <plat/gpio-core.h>
40 #include <plat/gpio-cfg.h>
41 #include <plat/gpio-cfg-helpers.h>
42 #include <plat/pm.h>
43
44 int samsung_gpio_setpull_updown(struct samsung_gpio_chip *chip,
45 unsigned int off, samsung_gpio_pull_t pull)
46 {
47 void __iomem *reg = chip->base + 0x08;
48 int shift = off * 2;
49 u32 pup;
50
51 pup = __raw_readl(reg);
52 pup &= ~(3 << shift);
53 pup |= pull << shift;
54 __raw_writel(pup, reg);
55
56 return 0;
57 }
58
59 samsung_gpio_pull_t samsung_gpio_getpull_updown(struct samsung_gpio_chip *chip,
60 unsigned int off)
61 {
62 void __iomem *reg = chip->base + 0x08;
63 int shift = off * 2;
64 u32 pup = __raw_readl(reg);
65
66 pup >>= shift;
67 pup &= 0x3;
68
69 return (__force samsung_gpio_pull_t)pup;
70 }
71
72 int s3c2443_gpio_setpull(struct samsung_gpio_chip *chip,
73 unsigned int off, samsung_gpio_pull_t pull)
74 {
75 switch (pull) {
76 case S3C_GPIO_PULL_NONE:
77 pull = 0x01;
78 break;
79 case S3C_GPIO_PULL_UP:
80 pull = 0x00;
81 break;
82 case S3C_GPIO_PULL_DOWN:
83 pull = 0x02;
84 break;
85 }
86 return samsung_gpio_setpull_updown(chip, off, pull);
87 }
88
89 samsung_gpio_pull_t s3c2443_gpio_getpull(struct samsung_gpio_chip *chip,
90 unsigned int off)
91 {
92 samsung_gpio_pull_t pull;
93
94 pull = samsung_gpio_getpull_updown(chip, off);
95
96 switch (pull) {
97 case 0x00:
98 pull = S3C_GPIO_PULL_UP;
99 break;
100 case 0x01:
101 case 0x03:
102 pull = S3C_GPIO_PULL_NONE;
103 break;
104 case 0x02:
105 pull = S3C_GPIO_PULL_DOWN;
106 break;
107 }
108
109 return pull;
110 }
111
112 static int s3c24xx_gpio_setpull_1(struct samsung_gpio_chip *chip,
113 unsigned int off, samsung_gpio_pull_t pull,
114 samsung_gpio_pull_t updown)
115 {
116 void __iomem *reg = chip->base + 0x08;
117 u32 pup = __raw_readl(reg);
118
119 if (pull == updown)
120 pup &= ~(1 << off);
121 else if (pull == S3C_GPIO_PULL_NONE)
122 pup |= (1 << off);
123 else
124 return -EINVAL;
125
126 __raw_writel(pup, reg);
127 return 0;
128 }
129
130 static samsung_gpio_pull_t s3c24xx_gpio_getpull_1(struct samsung_gpio_chip *chip,
131 unsigned int off,
132 samsung_gpio_pull_t updown)
133 {
134 void __iomem *reg = chip->base + 0x08;
135 u32 pup = __raw_readl(reg);
136
137 pup &= (1 << off);
138 return pup ? S3C_GPIO_PULL_NONE : updown;
139 }
140
141 samsung_gpio_pull_t s3c24xx_gpio_getpull_1up(struct samsung_gpio_chip *chip,
142 unsigned int off)
143 {
144 return s3c24xx_gpio_getpull_1(chip, off, S3C_GPIO_PULL_UP);
145 }
146
147 int s3c24xx_gpio_setpull_1up(struct samsung_gpio_chip *chip,
148 unsigned int off, samsung_gpio_pull_t pull)
149 {
150 return s3c24xx_gpio_setpull_1(chip, off, pull, S3C_GPIO_PULL_UP);
151 }
152
153 samsung_gpio_pull_t s3c24xx_gpio_getpull_1down(struct samsung_gpio_chip *chip,
154 unsigned int off)
155 {
156 return s3c24xx_gpio_getpull_1(chip, off, S3C_GPIO_PULL_DOWN);
157 }
158
159 int s3c24xx_gpio_setpull_1down(struct samsung_gpio_chip *chip,
160 unsigned int off, samsung_gpio_pull_t pull)
161 {
162 return s3c24xx_gpio_setpull_1(chip, off, pull, S3C_GPIO_PULL_DOWN);
163 }
164
165 /*
166 * samsung_gpio_setcfg_2bit - Samsung 2bit style GPIO configuration.
167 * @chip: The gpio chip that is being configured.
168 * @off: The offset for the GPIO being configured.
169 * @cfg: The configuration value to set.
170 *
171 * This helper deal with the GPIO cases where the control register
172 * has two bits of configuration per gpio, which have the following
173 * functions:
174 * 00 = input
175 * 01 = output
176 * 1x = special function
177 */
178
179 static int samsung_gpio_setcfg_2bit(struct samsung_gpio_chip *chip,
180 unsigned int off, unsigned int cfg)
181 {
182 void __iomem *reg = chip->base;
183 unsigned int shift = off * 2;
184 u32 con;
185
186 if (samsung_gpio_is_cfg_special(cfg)) {
187 cfg &= 0xf;
188 if (cfg > 3)
189 return -EINVAL;
190
191 cfg <<= shift;
192 }
193
194 con = __raw_readl(reg);
195 con &= ~(0x3 << shift);
196 con |= cfg;
197 __raw_writel(con, reg);
198
199 return 0;
200 }
201
202 /*
203 * samsung_gpio_getcfg_2bit - Samsung 2bit style GPIO configuration read.
204 * @chip: The gpio chip that is being configured.
205 * @off: The offset for the GPIO being configured.
206 *
207 * The reverse of samsung_gpio_setcfg_2bit(). Will return a value which
208 * could be directly passed back to samsung_gpio_setcfg_2bit(), from the
209 * S3C_GPIO_SPECIAL() macro.
210 */
211
212 static unsigned int samsung_gpio_getcfg_2bit(struct samsung_gpio_chip *chip,
213 unsigned int off)
214 {
215 u32 con;
216
217 con = __raw_readl(chip->base);
218 con >>= off * 2;
219 con &= 3;
220
221 /* this conversion works for IN and OUT as well as special mode */
222 return S3C_GPIO_SPECIAL(con);
223 }
224
225 /*
226 * samsung_gpio_setcfg_4bit - Samsung 4bit single register GPIO config.
227 * @chip: The gpio chip that is being configured.
228 * @off: The offset for the GPIO being configured.
229 * @cfg: The configuration value to set.
230 *
231 * This helper deal with the GPIO cases where the control register has 4 bits
232 * of control per GPIO, generally in the form of:
233 * 0000 = Input
234 * 0001 = Output
235 * others = Special functions (dependent on bank)
236 *
237 * Note, since the code to deal with the case where there are two control
238 * registers instead of one, we do not have a separate set of functions for
239 * each case.
240 */
241
242 static int samsung_gpio_setcfg_4bit(struct samsung_gpio_chip *chip,
243 unsigned int off, unsigned int cfg)
244 {
245 void __iomem *reg = chip->base;
246 unsigned int shift = (off & 7) * 4;
247 u32 con;
248
249 if (off < 8 && chip->chip.ngpio > 8)
250 reg -= 4;
251
252 if (samsung_gpio_is_cfg_special(cfg)) {
253 cfg &= 0xf;
254 cfg <<= shift;
255 }
256
257 con = __raw_readl(reg);
258 con &= ~(0xf << shift);
259 con |= cfg;
260 __raw_writel(con, reg);
261
262 return 0;
263 }
264
265 /*
266 * samsung_gpio_getcfg_4bit - Samsung 4bit single register GPIO config read.
267 * @chip: The gpio chip that is being configured.
268 * @off: The offset for the GPIO being configured.
269 *
270 * The reverse of samsung_gpio_setcfg_4bit(), turning a gpio configuration
271 * register setting into a value the software can use, such as could be passed
272 * to samsung_gpio_setcfg_4bit().
273 *
274 * @sa samsung_gpio_getcfg_2bit
275 */
276
277 static unsigned samsung_gpio_getcfg_4bit(struct samsung_gpio_chip *chip,
278 unsigned int off)
279 {
280 void __iomem *reg = chip->base;
281 unsigned int shift = (off & 7) * 4;
282 u32 con;
283
284 if (off < 8 && chip->chip.ngpio > 8)
285 reg -= 4;
286
287 con = __raw_readl(reg);
288 con >>= shift;
289 con &= 0xf;
290
291 /* this conversion works for IN and OUT as well as special mode */
292 return S3C_GPIO_SPECIAL(con);
293 }
294
295 #ifdef CONFIG_PLAT_S3C24XX
296 /*
297 * s3c24xx_gpio_setcfg_abank - S3C24XX style GPIO configuration (Bank A)
298 * @chip: The gpio chip that is being configured.
299 * @off: The offset for the GPIO being configured.
300 * @cfg: The configuration value to set.
301 *
302 * This helper deal with the GPIO cases where the control register
303 * has one bit of configuration for the gpio, where setting the bit
304 * means the pin is in special function mode and unset means output.
305 */
306
307 static int s3c24xx_gpio_setcfg_abank(struct samsung_gpio_chip *chip,
308 unsigned int off, unsigned int cfg)
309 {
310 void __iomem *reg = chip->base;
311 unsigned int shift = off;
312 u32 con;
313
314 if (samsung_gpio_is_cfg_special(cfg)) {
315 cfg &= 0xf;
316
317 /* Map output to 0, and SFN2 to 1 */
318 cfg -= 1;
319 if (cfg > 1)
320 return -EINVAL;
321
322 cfg <<= shift;
323 }
324
325 con = __raw_readl(reg);
326 con &= ~(0x1 << shift);
327 con |= cfg;
328 __raw_writel(con, reg);
329
330 return 0;
331 }
332
333 /*
334 * s3c24xx_gpio_getcfg_abank - S3C24XX style GPIO configuration read (Bank A)
335 * @chip: The gpio chip that is being configured.
336 * @off: The offset for the GPIO being configured.
337 *
338 * The reverse of s3c24xx_gpio_setcfg_abank() turning an GPIO into a usable
339 * GPIO configuration value.
340 *
341 * @sa samsung_gpio_getcfg_2bit
342 * @sa samsung_gpio_getcfg_4bit
343 */
344
345 static unsigned s3c24xx_gpio_getcfg_abank(struct samsung_gpio_chip *chip,
346 unsigned int off)
347 {
348 u32 con;
349
350 con = __raw_readl(chip->base);
351 con >>= off;
352 con &= 1;
353 con++;
354
355 return S3C_GPIO_SFN(con);
356 }
357 #endif
358
359 static void __init samsung_gpiolib_set_cfg(struct samsung_gpio_cfg *chipcfg,
360 int nr_chips)
361 {
362 for (; nr_chips > 0; nr_chips--, chipcfg++) {
363 if (!chipcfg->set_config)
364 chipcfg->set_config = samsung_gpio_setcfg_4bit;
365 if (!chipcfg->get_config)
366 chipcfg->get_config = samsung_gpio_getcfg_4bit;
367 if (!chipcfg->set_pull)
368 chipcfg->set_pull = samsung_gpio_setpull_updown;
369 if (!chipcfg->get_pull)
370 chipcfg->get_pull = samsung_gpio_getpull_updown;
371 }
372 }
373
374 struct samsung_gpio_cfg s3c24xx_gpiocfg_default = {
375 .set_config = samsung_gpio_setcfg_2bit,
376 .get_config = samsung_gpio_getcfg_2bit,
377 };
378
379 #ifdef CONFIG_PLAT_S3C24XX
380 static struct samsung_gpio_cfg s3c24xx_gpiocfg_banka = {
381 .set_config = s3c24xx_gpio_setcfg_abank,
382 .get_config = s3c24xx_gpio_getcfg_abank,
383 };
384 #endif
385
386 static struct samsung_gpio_cfg samsung_gpio_cfgs[] = {
387 [0] = {
388 .cfg_eint = 0x0,
389 },
390 [1] = {
391 .cfg_eint = 0x3,
392 },
393 [2] = {
394 .cfg_eint = 0x7,
395 },
396 [3] = {
397 .cfg_eint = 0xF,
398 },
399 [4] = {
400 .cfg_eint = 0x0,
401 .set_config = samsung_gpio_setcfg_2bit,
402 .get_config = samsung_gpio_getcfg_2bit,
403 },
404 [5] = {
405 .cfg_eint = 0x2,
406 .set_config = samsung_gpio_setcfg_2bit,
407 .get_config = samsung_gpio_getcfg_2bit,
408 },
409 [6] = {
410 .cfg_eint = 0x3,
411 .set_config = samsung_gpio_setcfg_2bit,
412 .get_config = samsung_gpio_getcfg_2bit,
413 },
414 [7] = {
415 .set_config = samsung_gpio_setcfg_2bit,
416 .get_config = samsung_gpio_getcfg_2bit,
417 },
418 };
419
420 /*
421 * Default routines for controlling GPIO, based on the original S3C24XX
422 * GPIO functions which deal with the case where each gpio bank of the
423 * chip is as following:
424 *
425 * base + 0x00: Control register, 2 bits per gpio
426 * gpio n: 2 bits starting at (2*n)
427 * 00 = input, 01 = output, others mean special-function
428 * base + 0x04: Data register, 1 bit per gpio
429 * bit n: data bit n
430 */
431
432 static int samsung_gpiolib_2bit_input(struct gpio_chip *chip, unsigned offset)
433 {
434 struct samsung_gpio_chip *ourchip = to_samsung_gpio(chip);
435 void __iomem *base = ourchip->base;
436 unsigned long flags;
437 unsigned long con;
438
439 samsung_gpio_lock(ourchip, flags);
440
441 con = __raw_readl(base + 0x00);
442 con &= ~(3 << (offset * 2));
443
444 __raw_writel(con, base + 0x00);
445
446 samsung_gpio_unlock(ourchip, flags);
447 return 0;
448 }
449
450 static int samsung_gpiolib_2bit_output(struct gpio_chip *chip,
451 unsigned offset, int value)
452 {
453 struct samsung_gpio_chip *ourchip = to_samsung_gpio(chip);
454 void __iomem *base = ourchip->base;
455 unsigned long flags;
456 unsigned long dat;
457 unsigned long con;
458
459 samsung_gpio_lock(ourchip, flags);
460
461 dat = __raw_readl(base + 0x04);
462 dat &= ~(1 << offset);
463 if (value)
464 dat |= 1 << offset;
465 __raw_writel(dat, base + 0x04);
466
467 con = __raw_readl(base + 0x00);
468 con &= ~(3 << (offset * 2));
469 con |= 1 << (offset * 2);
470
471 __raw_writel(con, base + 0x00);
472 __raw_writel(dat, base + 0x04);
473
474 samsung_gpio_unlock(ourchip, flags);
475 return 0;
476 }
477
478 /*
479 * The samsung_gpiolib_4bit routines are to control the gpio banks where
480 * the gpio configuration register (GPxCON) has 4 bits per GPIO, as the
481 * following example:
482 *
483 * base + 0x00: Control register, 4 bits per gpio
484 * gpio n: 4 bits starting at (4*n)
485 * 0000 = input, 0001 = output, others mean special-function
486 * base + 0x04: Data register, 1 bit per gpio
487 * bit n: data bit n
488 *
489 * Note, since the data register is one bit per gpio and is at base + 0x4
490 * we can use samsung_gpiolib_get and samsung_gpiolib_set to change the
491 * state of the output.
492 */
493
494 static int samsung_gpiolib_4bit_input(struct gpio_chip *chip,
495 unsigned int offset)
496 {
497 struct samsung_gpio_chip *ourchip = to_samsung_gpio(chip);
498 void __iomem *base = ourchip->base;
499 unsigned long con;
500
501 con = __raw_readl(base + GPIOCON_OFF);
502 if (ourchip->bitmap_gpio_int & BIT(offset))
503 con |= 0xf << con_4bit_shift(offset);
504 else
505 con &= ~(0xf << con_4bit_shift(offset));
506 __raw_writel(con, base + GPIOCON_OFF);
507
508 pr_debug("%s: %p: CON now %08lx\n", __func__, base, con);
509
510 return 0;
511 }
512
513 static int samsung_gpiolib_4bit_output(struct gpio_chip *chip,
514 unsigned int offset, int value)
515 {
516 struct samsung_gpio_chip *ourchip = to_samsung_gpio(chip);
517 void __iomem *base = ourchip->base;
518 unsigned long con;
519 unsigned long dat;
520
521 con = __raw_readl(base + GPIOCON_OFF);
522 con &= ~(0xf << con_4bit_shift(offset));
523 con |= 0x1 << con_4bit_shift(offset);
524
525 dat = __raw_readl(base + GPIODAT_OFF);
526
527 if (value)
528 dat |= 1 << offset;
529 else
530 dat &= ~(1 << offset);
531
532 __raw_writel(dat, base + GPIODAT_OFF);
533 __raw_writel(con, base + GPIOCON_OFF);
534 __raw_writel(dat, base + GPIODAT_OFF);
535
536 pr_debug("%s: %p: CON %08lx, DAT %08lx\n", __func__, base, con, dat);
537
538 return 0;
539 }
540
541 /*
542 * The next set of routines are for the case where the GPIO configuration
543 * registers are 4 bits per GPIO but there is more than one register (the
544 * bank has more than 8 GPIOs.
545 *
546 * This case is the similar to the 4 bit case, but the registers are as
547 * follows:
548 *
549 * base + 0x00: Control register, 4 bits per gpio (lower 8 GPIOs)
550 * gpio n: 4 bits starting at (4*n)
551 * 0000 = input, 0001 = output, others mean special-function
552 * base + 0x04: Control register, 4 bits per gpio (up to 8 additions GPIOs)
553 * gpio n: 4 bits starting at (4*n)
554 * 0000 = input, 0001 = output, others mean special-function
555 * base + 0x08: Data register, 1 bit per gpio
556 * bit n: data bit n
557 *
558 * To allow us to use the samsung_gpiolib_get and samsung_gpiolib_set
559 * routines we store the 'base + 0x4' address so that these routines see
560 * the data register at ourchip->base + 0x04.
561 */
562
563 static int samsung_gpiolib_4bit2_input(struct gpio_chip *chip,
564 unsigned int offset)
565 {
566 struct samsung_gpio_chip *ourchip = to_samsung_gpio(chip);
567 void __iomem *base = ourchip->base;
568 void __iomem *regcon = base;
569 unsigned long con;
570
571 if (offset > 7)
572 offset -= 8;
573 else
574 regcon -= 4;
575
576 con = __raw_readl(regcon);
577 con &= ~(0xf << con_4bit_shift(offset));
578 __raw_writel(con, regcon);
579
580 pr_debug("%s: %p: CON %08lx\n", __func__, base, con);
581
582 return 0;
583 }
584
585 static int samsung_gpiolib_4bit2_output(struct gpio_chip *chip,
586 unsigned int offset, int value)
587 {
588 struct samsung_gpio_chip *ourchip = to_samsung_gpio(chip);
589 void __iomem *base = ourchip->base;
590 void __iomem *regcon = base;
591 unsigned long con;
592 unsigned long dat;
593 unsigned con_offset = offset;
594
595 if (con_offset > 7)
596 con_offset -= 8;
597 else
598 regcon -= 4;
599
600 con = __raw_readl(regcon);
601 con &= ~(0xf << con_4bit_shift(con_offset));
602 con |= 0x1 << con_4bit_shift(con_offset);
603
604 dat = __raw_readl(base + GPIODAT_OFF);
605
606 if (value)
607 dat |= 1 << offset;
608 else
609 dat &= ~(1 << offset);
610
611 __raw_writel(dat, base + GPIODAT_OFF);
612 __raw_writel(con, regcon);
613 __raw_writel(dat, base + GPIODAT_OFF);
614
615 pr_debug("%s: %p: CON %08lx, DAT %08lx\n", __func__, base, con, dat);
616
617 return 0;
618 }
619
620 #ifdef CONFIG_PLAT_S3C24XX
621 /* The next set of routines are for the case of s3c24xx bank a */
622
623 static int s3c24xx_gpiolib_banka_input(struct gpio_chip *chip, unsigned offset)
624 {
625 return -EINVAL;
626 }
627
628 static int s3c24xx_gpiolib_banka_output(struct gpio_chip *chip,
629 unsigned offset, int value)
630 {
631 struct samsung_gpio_chip *ourchip = to_samsung_gpio(chip);
632 void __iomem *base = ourchip->base;
633 unsigned long flags;
634 unsigned long dat;
635 unsigned long con;
636
637 local_irq_save(flags);
638
639 con = __raw_readl(base + 0x00);
640 dat = __raw_readl(base + 0x04);
641
642 dat &= ~(1 << offset);
643 if (value)
644 dat |= 1 << offset;
645
646 __raw_writel(dat, base + 0x04);
647
648 con &= ~(1 << offset);
649
650 __raw_writel(con, base + 0x00);
651 __raw_writel(dat, base + 0x04);
652
653 local_irq_restore(flags);
654 return 0;
655 }
656 #endif
657
658 static void samsung_gpiolib_set(struct gpio_chip *chip,
659 unsigned offset, int value)
660 {
661 struct samsung_gpio_chip *ourchip = to_samsung_gpio(chip);
662 void __iomem *base = ourchip->base;
663 unsigned long flags;
664 unsigned long dat;
665
666 samsung_gpio_lock(ourchip, flags);
667
668 dat = __raw_readl(base + 0x04);
669 dat &= ~(1 << offset);
670 if (value)
671 dat |= 1 << offset;
672 __raw_writel(dat, base + 0x04);
673
674 samsung_gpio_unlock(ourchip, flags);
675 }
676
677 static int samsung_gpiolib_get(struct gpio_chip *chip, unsigned offset)
678 {
679 struct samsung_gpio_chip *ourchip = to_samsung_gpio(chip);
680 unsigned long val;
681
682 val = __raw_readl(ourchip->base + 0x04);
683 val >>= offset;
684 val &= 1;
685
686 return val;
687 }
688
689 /*
690 * CONFIG_S3C_GPIO_TRACK enables the tracking of the s3c specific gpios
691 * for use with the configuration calls, and other parts of the s3c gpiolib
692 * support code.
693 *
694 * Not all s3c support code will need this, as some configurations of cpu
695 * may only support one or two different configuration options and have an
696 * easy gpio to samsung_gpio_chip mapping function. If this is the case, then
697 * the machine support file should provide its own samsung_gpiolib_getchip()
698 * and any other necessary functions.
699 */
700
701 #ifdef CONFIG_S3C_GPIO_TRACK
702 struct samsung_gpio_chip *s3c_gpios[S3C_GPIO_END];
703
704 static __init void s3c_gpiolib_track(struct samsung_gpio_chip *chip)
705 {
706 unsigned int gpn;
707 int i;
708
709 gpn = chip->chip.base;
710 for (i = 0; i < chip->chip.ngpio; i++, gpn++) {
711 BUG_ON(gpn >= ARRAY_SIZE(s3c_gpios));
712 s3c_gpios[gpn] = chip;
713 }
714 }
715 #endif /* CONFIG_S3C_GPIO_TRACK */
716
717 /*
718 * samsung_gpiolib_add() - add the Samsung gpio_chip.
719 * @chip: The chip to register
720 *
721 * This is a wrapper to gpiochip_add() that takes our specific gpio chip
722 * information and makes the necessary alterations for the platform and
723 * notes the information for use with the configuration systems and any
724 * other parts of the system.
725 */
726
727 static void __init samsung_gpiolib_add(struct samsung_gpio_chip *chip)
728 {
729 struct gpio_chip *gc = &chip->chip;
730 int ret;
731
732 BUG_ON(!chip->base);
733 BUG_ON(!gc->label);
734 BUG_ON(!gc->ngpio);
735
736 spin_lock_init(&chip->lock);
737
738 if (!gc->direction_input)
739 gc->direction_input = samsung_gpiolib_2bit_input;
740 if (!gc->direction_output)
741 gc->direction_output = samsung_gpiolib_2bit_output;
742 if (!gc->set)
743 gc->set = samsung_gpiolib_set;
744 if (!gc->get)
745 gc->get = samsung_gpiolib_get;
746
747 #ifdef CONFIG_PM
748 if (chip->pm != NULL) {
749 if (!chip->pm->save || !chip->pm->resume)
750 pr_err("gpio: %s has missing PM functions\n",
751 gc->label);
752 } else
753 pr_err("gpio: %s has no PM function\n", gc->label);
754 #endif
755
756 /* gpiochip_add() prints own failure message on error. */
757 ret = gpiochip_add_data(gc, chip);
758 if (ret >= 0)
759 s3c_gpiolib_track(chip);
760 }
761
762 static void __init s3c24xx_gpiolib_add_chips(struct samsung_gpio_chip *chip,
763 int nr_chips, void __iomem *base)
764 {
765 int i;
766 struct gpio_chip *gc = &chip->chip;
767
768 for (i = 0 ; i < nr_chips; i++, chip++) {
769 /* skip banks not present on SoC */
770 if (chip->chip.base >= S3C_GPIO_END)
771 continue;
772
773 if (!chip->config)
774 chip->config = &s3c24xx_gpiocfg_default;
775 if (!chip->pm)
776 chip->pm = __gpio_pm(&samsung_gpio_pm_2bit);
777 if ((base != NULL) && (chip->base == NULL))
778 chip->base = base + ((i) * 0x10);
779
780 if (!gc->direction_input)
781 gc->direction_input = samsung_gpiolib_2bit_input;
782 if (!gc->direction_output)
783 gc->direction_output = samsung_gpiolib_2bit_output;
784
785 samsung_gpiolib_add(chip);
786 }
787 }
788
789 static void __init samsung_gpiolib_add_2bit_chips(struct samsung_gpio_chip *chip,
790 int nr_chips, void __iomem *base,
791 unsigned int offset)
792 {
793 int i;
794
795 for (i = 0 ; i < nr_chips; i++, chip++) {
796 chip->chip.direction_input = samsung_gpiolib_2bit_input;
797 chip->chip.direction_output = samsung_gpiolib_2bit_output;
798
799 if (!chip->config)
800 chip->config = &samsung_gpio_cfgs[7];
801 if (!chip->pm)
802 chip->pm = __gpio_pm(&samsung_gpio_pm_2bit);
803 if ((base != NULL) && (chip->base == NULL))
804 chip->base = base + ((i) * offset);
805
806 samsung_gpiolib_add(chip);
807 }
808 }
809
810 /*
811 * samsung_gpiolib_add_4bit_chips - 4bit single register GPIO config.
812 * @chip: The gpio chip that is being configured.
813 * @nr_chips: The no of chips (gpio ports) for the GPIO being configured.
814 *
815 * This helper deal with the GPIO cases where the control register has 4 bits
816 * of control per GPIO, generally in the form of:
817 * 0000 = Input
818 * 0001 = Output
819 * others = Special functions (dependent on bank)
820 *
821 * Note, since the code to deal with the case where there are two control
822 * registers instead of one, we do not have a separate set of function
823 * (samsung_gpiolib_add_4bit2_chips)for each case.
824 */
825
826 static void __init samsung_gpiolib_add_4bit_chips(struct samsung_gpio_chip *chip,
827 int nr_chips, void __iomem *base)
828 {
829 int i;
830
831 for (i = 0 ; i < nr_chips; i++, chip++) {
832 chip->chip.direction_input = samsung_gpiolib_4bit_input;
833 chip->chip.direction_output = samsung_gpiolib_4bit_output;
834
835 if (!chip->config)
836 chip->config = &samsung_gpio_cfgs[2];
837 if (!chip->pm)
838 chip->pm = __gpio_pm(&samsung_gpio_pm_4bit);
839 if ((base != NULL) && (chip->base == NULL))
840 chip->base = base + ((i) * 0x20);
841
842 chip->bitmap_gpio_int = 0;
843
844 samsung_gpiolib_add(chip);
845 }
846 }
847
848 static void __init samsung_gpiolib_add_4bit2_chips(struct samsung_gpio_chip *chip,
849 int nr_chips)
850 {
851 for (; nr_chips > 0; nr_chips--, chip++) {
852 chip->chip.direction_input = samsung_gpiolib_4bit2_input;
853 chip->chip.direction_output = samsung_gpiolib_4bit2_output;
854
855 if (!chip->config)
856 chip->config = &samsung_gpio_cfgs[2];
857 if (!chip->pm)
858 chip->pm = __gpio_pm(&samsung_gpio_pm_4bit);
859
860 samsung_gpiolib_add(chip);
861 }
862 }
863
864 int samsung_gpiolib_to_irq(struct gpio_chip *chip, unsigned int offset)
865 {
866 struct samsung_gpio_chip *samsung_chip = gpiochip_get_data(chip);
867
868 return samsung_chip->irq_base + offset;
869 }
870
871 #ifdef CONFIG_PLAT_S3C24XX
872 static int s3c24xx_gpiolib_fbank_to_irq(struct gpio_chip *chip, unsigned offset)
873 {
874 if (offset < 4) {
875 if (soc_is_s3c2412())
876 return IRQ_EINT0_2412 + offset;
877 else
878 return IRQ_EINT0 + offset;
879 }
880
881 if (offset < 8)
882 return IRQ_EINT4 + offset - 4;
883
884 return -EINVAL;
885 }
886 #endif
887
888 #ifdef CONFIG_ARCH_S3C64XX
889 static int s3c64xx_gpiolib_mbank_to_irq(struct gpio_chip *chip, unsigned pin)
890 {
891 return pin < 5 ? IRQ_EINT(23) + pin : -ENXIO;
892 }
893
894 static int s3c64xx_gpiolib_lbank_to_irq(struct gpio_chip *chip, unsigned pin)
895 {
896 return pin >= 8 ? IRQ_EINT(16) + pin - 8 : -ENXIO;
897 }
898 #endif
899
900 struct samsung_gpio_chip s3c24xx_gpios[] = {
901 #ifdef CONFIG_PLAT_S3C24XX
902 {
903 .config = &s3c24xx_gpiocfg_banka,
904 .chip = {
905 .base = S3C2410_GPA(0),
906 .owner = THIS_MODULE,
907 .label = "GPIOA",
908 .ngpio = 27,
909 .direction_input = s3c24xx_gpiolib_banka_input,
910 .direction_output = s3c24xx_gpiolib_banka_output,
911 },
912 }, {
913 .chip = {
914 .base = S3C2410_GPB(0),
915 .owner = THIS_MODULE,
916 .label = "GPIOB",
917 .ngpio = 11,
918 },
919 }, {
920 .chip = {
921 .base = S3C2410_GPC(0),
922 .owner = THIS_MODULE,
923 .label = "GPIOC",
924 .ngpio = 16,
925 },
926 }, {
927 .chip = {
928 .base = S3C2410_GPD(0),
929 .owner = THIS_MODULE,
930 .label = "GPIOD",
931 .ngpio = 16,
932 },
933 }, {
934 .chip = {
935 .base = S3C2410_GPE(0),
936 .label = "GPIOE",
937 .owner = THIS_MODULE,
938 .ngpio = 16,
939 },
940 }, {
941 .chip = {
942 .base = S3C2410_GPF(0),
943 .owner = THIS_MODULE,
944 .label = "GPIOF",
945 .ngpio = 8,
946 .to_irq = s3c24xx_gpiolib_fbank_to_irq,
947 },
948 }, {
949 .irq_base = IRQ_EINT8,
950 .chip = {
951 .base = S3C2410_GPG(0),
952 .owner = THIS_MODULE,
953 .label = "GPIOG",
954 .ngpio = 16,
955 .to_irq = samsung_gpiolib_to_irq,
956 },
957 }, {
958 .chip = {
959 .base = S3C2410_GPH(0),
960 .owner = THIS_MODULE,
961 .label = "GPIOH",
962 .ngpio = 15,
963 },
964 },
965 /* GPIOS for the S3C2443 and later devices. */
966 {
967 .base = S3C2440_GPJCON,
968 .chip = {
969 .base = S3C2410_GPJ(0),
970 .owner = THIS_MODULE,
971 .label = "GPIOJ",
972 .ngpio = 16,
973 },
974 }, {
975 .base = S3C2443_GPKCON,
976 .chip = {
977 .base = S3C2410_GPK(0),
978 .owner = THIS_MODULE,
979 .label = "GPIOK",
980 .ngpio = 16,
981 },
982 }, {
983 .base = S3C2443_GPLCON,
984 .chip = {
985 .base = S3C2410_GPL(0),
986 .owner = THIS_MODULE,
987 .label = "GPIOL",
988 .ngpio = 15,
989 },
990 }, {
991 .base = S3C2443_GPMCON,
992 .chip = {
993 .base = S3C2410_GPM(0),
994 .owner = THIS_MODULE,
995 .label = "GPIOM",
996 .ngpio = 2,
997 },
998 },
999 #endif
1000 };
1001
1002 /*
1003 * GPIO bank summary:
1004 *
1005 * Bank GPIOs Style SlpCon ExtInt Group
1006 * A 8 4Bit Yes 1
1007 * B 7 4Bit Yes 1
1008 * C 8 4Bit Yes 2
1009 * D 5 4Bit Yes 3
1010 * E 5 4Bit Yes None
1011 * F 16 2Bit Yes 4 [1]
1012 * G 7 4Bit Yes 5
1013 * H 10 4Bit[2] Yes 6
1014 * I 16 2Bit Yes None
1015 * J 12 2Bit Yes None
1016 * K 16 4Bit[2] No None
1017 * L 15 4Bit[2] No None
1018 * M 6 4Bit No IRQ_EINT
1019 * N 16 2Bit No IRQ_EINT
1020 * O 16 2Bit Yes 7
1021 * P 15 2Bit Yes 8
1022 * Q 9 2Bit Yes 9
1023 *
1024 * [1] BANKF pins 14,15 do not form part of the external interrupt sources
1025 * [2] BANK has two control registers, GPxCON0 and GPxCON1
1026 */
1027
1028 static struct samsung_gpio_chip s3c64xx_gpios_4bit[] = {
1029 #ifdef CONFIG_ARCH_S3C64XX
1030 {
1031 .chip = {
1032 .base = S3C64XX_GPA(0),
1033 .ngpio = S3C64XX_GPIO_A_NR,
1034 .label = "GPA",
1035 },
1036 }, {
1037 .chip = {
1038 .base = S3C64XX_GPB(0),
1039 .ngpio = S3C64XX_GPIO_B_NR,
1040 .label = "GPB",
1041 },
1042 }, {
1043 .chip = {
1044 .base = S3C64XX_GPC(0),
1045 .ngpio = S3C64XX_GPIO_C_NR,
1046 .label = "GPC",
1047 },
1048 }, {
1049 .chip = {
1050 .base = S3C64XX_GPD(0),
1051 .ngpio = S3C64XX_GPIO_D_NR,
1052 .label = "GPD",
1053 },
1054 }, {
1055 .config = &samsung_gpio_cfgs[0],
1056 .chip = {
1057 .base = S3C64XX_GPE(0),
1058 .ngpio = S3C64XX_GPIO_E_NR,
1059 .label = "GPE",
1060 },
1061 }, {
1062 .base = S3C64XX_GPG_BASE,
1063 .chip = {
1064 .base = S3C64XX_GPG(0),
1065 .ngpio = S3C64XX_GPIO_G_NR,
1066 .label = "GPG",
1067 },
1068 }, {
1069 .base = S3C64XX_GPM_BASE,
1070 .config = &samsung_gpio_cfgs[1],
1071 .chip = {
1072 .base = S3C64XX_GPM(0),
1073 .ngpio = S3C64XX_GPIO_M_NR,
1074 .label = "GPM",
1075 .to_irq = s3c64xx_gpiolib_mbank_to_irq,
1076 },
1077 },
1078 #endif
1079 };
1080
1081 static struct samsung_gpio_chip s3c64xx_gpios_4bit2[] = {
1082 #ifdef CONFIG_ARCH_S3C64XX
1083 {
1084 .base = S3C64XX_GPH_BASE + 0x4,
1085 .chip = {
1086 .base = S3C64XX_GPH(0),
1087 .ngpio = S3C64XX_GPIO_H_NR,
1088 .label = "GPH",
1089 },
1090 }, {
1091 .base = S3C64XX_GPK_BASE + 0x4,
1092 .config = &samsung_gpio_cfgs[0],
1093 .chip = {
1094 .base = S3C64XX_GPK(0),
1095 .ngpio = S3C64XX_GPIO_K_NR,
1096 .label = "GPK",
1097 },
1098 }, {
1099 .base = S3C64XX_GPL_BASE + 0x4,
1100 .config = &samsung_gpio_cfgs[1],
1101 .chip = {
1102 .base = S3C64XX_GPL(0),
1103 .ngpio = S3C64XX_GPIO_L_NR,
1104 .label = "GPL",
1105 .to_irq = s3c64xx_gpiolib_lbank_to_irq,
1106 },
1107 },
1108 #endif
1109 };
1110
1111 static struct samsung_gpio_chip s3c64xx_gpios_2bit[] = {
1112 #ifdef CONFIG_ARCH_S3C64XX
1113 {
1114 .base = S3C64XX_GPF_BASE,
1115 .config = &samsung_gpio_cfgs[6],
1116 .chip = {
1117 .base = S3C64XX_GPF(0),
1118 .ngpio = S3C64XX_GPIO_F_NR,
1119 .label = "GPF",
1120 },
1121 }, {
1122 .config = &samsung_gpio_cfgs[7],
1123 .chip = {
1124 .base = S3C64XX_GPI(0),
1125 .ngpio = S3C64XX_GPIO_I_NR,
1126 .label = "GPI",
1127 },
1128 }, {
1129 .config = &samsung_gpio_cfgs[7],
1130 .chip = {
1131 .base = S3C64XX_GPJ(0),
1132 .ngpio = S3C64XX_GPIO_J_NR,
1133 .label = "GPJ",
1134 },
1135 }, {
1136 .config = &samsung_gpio_cfgs[6],
1137 .chip = {
1138 .base = S3C64XX_GPO(0),
1139 .ngpio = S3C64XX_GPIO_O_NR,
1140 .label = "GPO",
1141 },
1142 }, {
1143 .config = &samsung_gpio_cfgs[6],
1144 .chip = {
1145 .base = S3C64XX_GPP(0),
1146 .ngpio = S3C64XX_GPIO_P_NR,
1147 .label = "GPP",
1148 },
1149 }, {
1150 .config = &samsung_gpio_cfgs[6],
1151 .chip = {
1152 .base = S3C64XX_GPQ(0),
1153 .ngpio = S3C64XX_GPIO_Q_NR,
1154 .label = "GPQ",
1155 },
1156 }, {
1157 .base = S3C64XX_GPN_BASE,
1158 .irq_base = IRQ_EINT(0),
1159 .config = &samsung_gpio_cfgs[5],
1160 .chip = {
1161 .base = S3C64XX_GPN(0),
1162 .ngpio = S3C64XX_GPIO_N_NR,
1163 .label = "GPN",
1164 .to_irq = samsung_gpiolib_to_irq,
1165 },
1166 },
1167 #endif
1168 };
1169
1170 /* TODO: cleanup soc_is_* */
1171 static __init int samsung_gpiolib_init(void)
1172 {
1173 /*
1174 * Currently there are two drivers that can provide GPIO support for
1175 * Samsung SoCs. For device tree enabled platforms, the new
1176 * pinctrl-samsung driver is used, providing both GPIO and pin control
1177 * interfaces. For legacy (non-DT) platforms this driver is used.
1178 */
1179 if (of_have_populated_dt())
1180 return 0;
1181
1182 if (soc_is_s3c24xx()) {
1183 samsung_gpiolib_set_cfg(samsung_gpio_cfgs,
1184 ARRAY_SIZE(samsung_gpio_cfgs));
1185 s3c24xx_gpiolib_add_chips(s3c24xx_gpios,
1186 ARRAY_SIZE(s3c24xx_gpios), S3C24XX_VA_GPIO);
1187 } else if (soc_is_s3c64xx()) {
1188 samsung_gpiolib_set_cfg(samsung_gpio_cfgs,
1189 ARRAY_SIZE(samsung_gpio_cfgs));
1190 samsung_gpiolib_add_2bit_chips(s3c64xx_gpios_2bit,
1191 ARRAY_SIZE(s3c64xx_gpios_2bit),
1192 S3C64XX_VA_GPIO + 0xE0, 0x20);
1193 samsung_gpiolib_add_4bit_chips(s3c64xx_gpios_4bit,
1194 ARRAY_SIZE(s3c64xx_gpios_4bit),
1195 S3C64XX_VA_GPIO);
1196 samsung_gpiolib_add_4bit2_chips(s3c64xx_gpios_4bit2,
1197 ARRAY_SIZE(s3c64xx_gpios_4bit2));
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
Linux kernel - Deliverables
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