?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
mm: make wait_on_page_writeback() wait for multiple pending writebacks
[linux/fpc-iii.git] / arch / arm / mach-s3c / gpio-samsung.c
blob76ef415789f25c554ddc5c3a1a5f0230dac97380
1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // Copyright (c) 2009-2011 Samsung Electronics Co., Ltd.
4 // http://www.samsung.com/
5 //
6 // Copyright 2008 Openmoko, Inc.
7 // Copyright 2008 Simtec Electronics
8 // Ben Dooks <ben@simtec.co.uk>
9 // http://armlinux.simtec.co.uk/
10 //
11 // Samsung - GPIOlib support
12
13 #include <linux/kernel.h>
14 #include <linux/irq.h>
15 #include <linux/io.h>
16 #include <linux/gpio.h>
17 #include <linux/init.h>
18 #include <linux/spinlock.h>
19 #include <linux/module.h>
20 #include <linux/interrupt.h>
21 #include <linux/device.h>
22 #include <linux/ioport.h>
23 #include <linux/of.h>
24 #include <linux/slab.h>
25 #include <linux/of_address.h>
26
27 #include <asm/irq.h>
28
29 #include <mach/irqs.h>
30 #include "map.h"
31 #include "regs-gpio.h"
32 #include "gpio-samsung.h"
33
34 #include "cpu.h"
35 #include "gpio-core.h"
36 #include "gpio-cfg.h"
37 #include "gpio-cfg-helpers.h"
38 #include "pm.h"
39
40 int samsung_gpio_setpull_updown(struct samsung_gpio_chip *chip,
41 unsigned int off, samsung_gpio_pull_t pull)
42 {
43 void __iomem *reg = chip->base + 0x08;
44 int shift = off * 2;
45 u32 pup;
46
47 pup = __raw_readl(reg);
48 pup &= ~(3 << shift);
49 pup |= pull << shift;
50 __raw_writel(pup, reg);
51
52 return 0;
53 }
54
55 samsung_gpio_pull_t samsung_gpio_getpull_updown(struct samsung_gpio_chip *chip,
56 unsigned int off)
57 {
58 void __iomem *reg = chip->base + 0x08;
59 int shift = off * 2;
60 u32 pup = __raw_readl(reg);
61
62 pup >>= shift;
63 pup &= 0x3;
64
65 return (__force samsung_gpio_pull_t)pup;
66 }
67
68 int s3c2443_gpio_setpull(struct samsung_gpio_chip *chip,
69 unsigned int off, samsung_gpio_pull_t pull)
70 {
71 switch (pull) {
72 case S3C_GPIO_PULL_NONE:
73 pull = 0x01;
74 break;
75 case S3C_GPIO_PULL_UP:
76 pull = 0x00;
77 break;
78 case S3C_GPIO_PULL_DOWN:
79 pull = 0x02;
80 break;
81 }
82 return samsung_gpio_setpull_updown(chip, off, pull);
83 }
84
85 samsung_gpio_pull_t s3c2443_gpio_getpull(struct samsung_gpio_chip *chip,
86 unsigned int off)
87 {
88 samsung_gpio_pull_t pull;
89
90 pull = samsung_gpio_getpull_updown(chip, off);
91
92 switch (pull) {
93 case 0x00:
94 pull = S3C_GPIO_PULL_UP;
95 break;
96 case 0x01:
97 case 0x03:
98 pull = S3C_GPIO_PULL_NONE;
99 break;
100 case 0x02:
101 pull = S3C_GPIO_PULL_DOWN;
102 break;
103 }
104
105 return pull;
106 }
107
108 static int s3c24xx_gpio_setpull_1(struct samsung_gpio_chip *chip,
109 unsigned int off, samsung_gpio_pull_t pull,
110 samsung_gpio_pull_t updown)
111 {
112 void __iomem *reg = chip->base + 0x08;
113 u32 pup = __raw_readl(reg);
114
115 if (pull == updown)
116 pup &= ~(1 << off);
117 else if (pull == S3C_GPIO_PULL_NONE)
118 pup |= (1 << off);
119 else
120 return -EINVAL;
121
122 __raw_writel(pup, reg);
123 return 0;
124 }
125
126 static samsung_gpio_pull_t s3c24xx_gpio_getpull_1(struct samsung_gpio_chip *chip,
127 unsigned int off,
128 samsung_gpio_pull_t updown)
129 {
130 void __iomem *reg = chip->base + 0x08;
131 u32 pup = __raw_readl(reg);
132
133 pup &= (1 << off);
134 return pup ? S3C_GPIO_PULL_NONE : updown;
135 }
136
137 samsung_gpio_pull_t s3c24xx_gpio_getpull_1up(struct samsung_gpio_chip *chip,
138 unsigned int off)
139 {
140 return s3c24xx_gpio_getpull_1(chip, off, S3C_GPIO_PULL_UP);
141 }
142
143 int s3c24xx_gpio_setpull_1up(struct samsung_gpio_chip *chip,
144 unsigned int off, samsung_gpio_pull_t pull)
145 {
146 return s3c24xx_gpio_setpull_1(chip, off, pull, S3C_GPIO_PULL_UP);
147 }
148
149 samsung_gpio_pull_t s3c24xx_gpio_getpull_1down(struct samsung_gpio_chip *chip,
150 unsigned int off)
151 {
152 return s3c24xx_gpio_getpull_1(chip, off, S3C_GPIO_PULL_DOWN);
153 }
154
155 int s3c24xx_gpio_setpull_1down(struct samsung_gpio_chip *chip,
156 unsigned int off, samsung_gpio_pull_t pull)
157 {
158 return s3c24xx_gpio_setpull_1(chip, off, pull, S3C_GPIO_PULL_DOWN);
159 }
160
161 /*
162 * samsung_gpio_setcfg_2bit - Samsung 2bit style GPIO configuration.
163 * @chip: The gpio chip that is being configured.
164 * @off: The offset for the GPIO being configured.
165 * @cfg: The configuration value to set.
166 *
167 * This helper deal with the GPIO cases where the control register
168 * has two bits of configuration per gpio, which have the following
169 * functions:
170 * 00 = input
171 * 01 = output
172 * 1x = special function
173 */
174
175 static int samsung_gpio_setcfg_2bit(struct samsung_gpio_chip *chip,
176 unsigned int off, unsigned int cfg)
177 {
178 void __iomem *reg = chip->base;
179 unsigned int shift = off * 2;
180 u32 con;
181
182 if (samsung_gpio_is_cfg_special(cfg)) {
183 cfg &= 0xf;
184 if (cfg > 3)
185 return -EINVAL;
186
187 cfg <<= shift;
188 }
189
190 con = __raw_readl(reg);
191 con &= ~(0x3 << shift);
192 con |= cfg;
193 __raw_writel(con, reg);
194
195 return 0;
196 }
197
198 /*
199 * samsung_gpio_getcfg_2bit - Samsung 2bit style GPIO configuration read.
200 * @chip: The gpio chip that is being configured.
201 * @off: The offset for the GPIO being configured.
202 *
203 * The reverse of samsung_gpio_setcfg_2bit(). Will return a value which
204 * could be directly passed back to samsung_gpio_setcfg_2bit(), from the
205 * S3C_GPIO_SPECIAL() macro.
206 */
207
208 static unsigned int samsung_gpio_getcfg_2bit(struct samsung_gpio_chip *chip,
209 unsigned int off)
210 {
211 u32 con;
212
213 con = __raw_readl(chip->base);
214 con >>= off * 2;
215 con &= 3;
216
217 /* this conversion works for IN and OUT as well as special mode */
218 return S3C_GPIO_SPECIAL(con);
219 }
220
221 /*
222 * samsung_gpio_setcfg_4bit - Samsung 4bit single register GPIO config.
223 * @chip: The gpio chip that is being configured.
224 * @off: The offset for the GPIO being configured.
225 * @cfg: The configuration value to set.
226 *
227 * This helper deal with the GPIO cases where the control register has 4 bits
228 * of control per GPIO, generally in the form of:
229 * 0000 = Input
230 * 0001 = Output
231 * others = Special functions (dependent on bank)
232 *
233 * Note, since the code to deal with the case where there are two control
234 * registers instead of one, we do not have a separate set of functions for
235 * each case.
236 */
237
238 static int samsung_gpio_setcfg_4bit(struct samsung_gpio_chip *chip,
239 unsigned int off, unsigned int cfg)
240 {
241 void __iomem *reg = chip->base;
242 unsigned int shift = (off & 7) * 4;
243 u32 con;
244
245 if (off < 8 && chip->chip.ngpio > 8)
246 reg -= 4;
247
248 if (samsung_gpio_is_cfg_special(cfg)) {
249 cfg &= 0xf;
250 cfg <<= shift;
251 }
252
253 con = __raw_readl(reg);
254 con &= ~(0xf << shift);
255 con |= cfg;
256 __raw_writel(con, reg);
257
258 return 0;
259 }
260
261 /*
262 * samsung_gpio_getcfg_4bit - Samsung 4bit single register GPIO config read.
263 * @chip: The gpio chip that is being configured.
264 * @off: The offset for the GPIO being configured.
265 *
266 * The reverse of samsung_gpio_setcfg_4bit(), turning a gpio configuration
267 * register setting into a value the software can use, such as could be passed
268 * to samsung_gpio_setcfg_4bit().
269 *
270 * @sa samsung_gpio_getcfg_2bit
271 */
272
273 static unsigned samsung_gpio_getcfg_4bit(struct samsung_gpio_chip *chip,
274 unsigned int off)
275 {
276 void __iomem *reg = chip->base;
277 unsigned int shift = (off & 7) * 4;
278 u32 con;
279
280 if (off < 8 && chip->chip.ngpio > 8)
281 reg -= 4;
282
283 con = __raw_readl(reg);
284 con >>= shift;
285 con &= 0xf;
286
287 /* this conversion works for IN and OUT as well as special mode */
288 return S3C_GPIO_SPECIAL(con);
289 }
290
291 #ifdef CONFIG_PLAT_S3C24XX
292 /*
293 * s3c24xx_gpio_setcfg_abank - S3C24XX style GPIO configuration (Bank A)
294 * @chip: The gpio chip that is being configured.
295 * @off: The offset for the GPIO being configured.
296 * @cfg: The configuration value to set.
297 *
298 * This helper deal with the GPIO cases where the control register
299 * has one bit of configuration for the gpio, where setting the bit
300 * means the pin is in special function mode and unset means output.
301 */
302
303 static int s3c24xx_gpio_setcfg_abank(struct samsung_gpio_chip *chip,
304 unsigned int off, unsigned int cfg)
305 {
306 void __iomem *reg = chip->base;
307 unsigned int shift = off;
308 u32 con;
309
310 if (samsung_gpio_is_cfg_special(cfg)) {
311 cfg &= 0xf;
312
313 /* Map output to 0, and SFN2 to 1 */
314 cfg -= 1;
315 if (cfg > 1)
316 return -EINVAL;
317
318 cfg <<= shift;
319 }
320
321 con = __raw_readl(reg);
322 con &= ~(0x1 << shift);
323 con |= cfg;
324 __raw_writel(con, reg);
325
326 return 0;
327 }
328
329 /*
330 * s3c24xx_gpio_getcfg_abank - S3C24XX style GPIO configuration read (Bank A)
331 * @chip: The gpio chip that is being configured.
332 * @off: The offset for the GPIO being configured.
333 *
334 * The reverse of s3c24xx_gpio_setcfg_abank() turning an GPIO into a usable
335 * GPIO configuration value.
336 *
337 * @sa samsung_gpio_getcfg_2bit
338 * @sa samsung_gpio_getcfg_4bit
339 */
340
341 static unsigned s3c24xx_gpio_getcfg_abank(struct samsung_gpio_chip *chip,
342 unsigned int off)
343 {
344 u32 con;
345
346 con = __raw_readl(chip->base);
347 con >>= off;
348 con &= 1;
349 con++;
350
351 return S3C_GPIO_SFN(con);
352 }
353 #endif
354
355 static void __init samsung_gpiolib_set_cfg(struct samsung_gpio_cfg *chipcfg,
356 int nr_chips)
357 {
358 for (; nr_chips > 0; nr_chips--, chipcfg++) {
359 if (!chipcfg->set_config)
360 chipcfg->set_config = samsung_gpio_setcfg_4bit;
361 if (!chipcfg->get_config)
362 chipcfg->get_config = samsung_gpio_getcfg_4bit;
363 if (!chipcfg->set_pull)
364 chipcfg->set_pull = samsung_gpio_setpull_updown;
365 if (!chipcfg->get_pull)
366 chipcfg->get_pull = samsung_gpio_getpull_updown;
367 }
368 }
369
370 struct samsung_gpio_cfg s3c24xx_gpiocfg_default = {
371 .set_config = samsung_gpio_setcfg_2bit,
372 .get_config = samsung_gpio_getcfg_2bit,
373 };
374
375 #ifdef CONFIG_PLAT_S3C24XX
376 static struct samsung_gpio_cfg s3c24xx_gpiocfg_banka = {
377 .set_config = s3c24xx_gpio_setcfg_abank,
378 .get_config = s3c24xx_gpio_getcfg_abank,
379 };
380 #endif
381
382 static struct samsung_gpio_cfg samsung_gpio_cfgs[] = {
383 [0] = {
384 .cfg_eint = 0x0,
385 },
386 [1] = {
387 .cfg_eint = 0x3,
388 },
389 [2] = {
390 .cfg_eint = 0x7,
391 },
392 [3] = {
393 .cfg_eint = 0xF,
394 },
395 [4] = {
396 .cfg_eint = 0x0,
397 .set_config = samsung_gpio_setcfg_2bit,
398 .get_config = samsung_gpio_getcfg_2bit,
399 },
400 [5] = {
401 .cfg_eint = 0x2,
402 .set_config = samsung_gpio_setcfg_2bit,
403 .get_config = samsung_gpio_getcfg_2bit,
404 },
405 [6] = {
406 .cfg_eint = 0x3,
407 .set_config = samsung_gpio_setcfg_2bit,
408 .get_config = samsung_gpio_getcfg_2bit,
409 },
410 [7] = {
411 .set_config = samsung_gpio_setcfg_2bit,
412 .get_config = samsung_gpio_getcfg_2bit,
413 },
414 };
415
416 /*
417 * Default routines for controlling GPIO, based on the original S3C24XX
418 * GPIO functions which deal with the case where each gpio bank of the
419 * chip is as following:
420 *
421 * base + 0x00: Control register, 2 bits per gpio
422 * gpio n: 2 bits starting at (2*n)
423 * 00 = input, 01 = output, others mean special-function
424 * base + 0x04: Data register, 1 bit per gpio
425 * bit n: data bit n
426 */
427
428 static int samsung_gpiolib_2bit_input(struct gpio_chip *chip, unsigned offset)
429 {
430 struct samsung_gpio_chip *ourchip = to_samsung_gpio(chip);
431 void __iomem *base = ourchip->base;
432 unsigned long flags;
433 unsigned long con;
434
435 samsung_gpio_lock(ourchip, flags);
436
437 con = __raw_readl(base + 0x00);
438 con &= ~(3 << (offset * 2));
439
440 __raw_writel(con, base + 0x00);
441
442 samsung_gpio_unlock(ourchip, flags);
443 return 0;
444 }
445
446 static int samsung_gpiolib_2bit_output(struct gpio_chip *chip,
447 unsigned offset, int value)
448 {
449 struct samsung_gpio_chip *ourchip = to_samsung_gpio(chip);
450 void __iomem *base = ourchip->base;
451 unsigned long flags;
452 unsigned long dat;
453 unsigned long con;
454
455 samsung_gpio_lock(ourchip, flags);
456
457 dat = __raw_readl(base + 0x04);
458 dat &= ~(1 << offset);
459 if (value)
460 dat |= 1 << offset;
461 __raw_writel(dat, base + 0x04);
462
463 con = __raw_readl(base + 0x00);
464 con &= ~(3 << (offset * 2));
465 con |= 1 << (offset * 2);
466
467 __raw_writel(con, base + 0x00);
468 __raw_writel(dat, base + 0x04);
469
470 samsung_gpio_unlock(ourchip, flags);
471 return 0;
472 }
473
474 /*
475 * The samsung_gpiolib_4bit routines are to control the gpio banks where
476 * the gpio configuration register (GPxCON) has 4 bits per GPIO, as the
477 * following example:
478 *
479 * base + 0x00: Control register, 4 bits per gpio
480 * gpio n: 4 bits starting at (4*n)
481 * 0000 = input, 0001 = output, others mean special-function
482 * base + 0x04: Data register, 1 bit per gpio
483 * bit n: data bit n
484 *
485 * Note, since the data register is one bit per gpio and is at base + 0x4
486 * we can use samsung_gpiolib_get and samsung_gpiolib_set to change the
487 * state of the output.
488 */
489
490 static int samsung_gpiolib_4bit_input(struct gpio_chip *chip,
491 unsigned int offset)
492 {
493 struct samsung_gpio_chip *ourchip = to_samsung_gpio(chip);
494 void __iomem *base = ourchip->base;
495 unsigned long con;
496
497 con = __raw_readl(base + GPIOCON_OFF);
498 if (ourchip->bitmap_gpio_int & BIT(offset))
499 con |= 0xf << con_4bit_shift(offset);
500 else
501 con &= ~(0xf << con_4bit_shift(offset));
502 __raw_writel(con, base + GPIOCON_OFF);
503
504 pr_debug("%s: %p: CON now %08lx\n", __func__, base, con);
505
506 return 0;
507 }
508
509 static int samsung_gpiolib_4bit_output(struct gpio_chip *chip,
510 unsigned int offset, int value)
511 {
512 struct samsung_gpio_chip *ourchip = to_samsung_gpio(chip);
513 void __iomem *base = ourchip->base;
514 unsigned long con;
515 unsigned long dat;
516
517 con = __raw_readl(base + GPIOCON_OFF);
518 con &= ~(0xf << con_4bit_shift(offset));
519 con |= 0x1 << con_4bit_shift(offset);
520
521 dat = __raw_readl(base + GPIODAT_OFF);
522
523 if (value)
524 dat |= 1 << offset;
525 else
526 dat &= ~(1 << offset);
527
528 __raw_writel(dat, base + GPIODAT_OFF);
529 __raw_writel(con, base + GPIOCON_OFF);
530 __raw_writel(dat, base + GPIODAT_OFF);
531
532 pr_debug("%s: %p: CON %08lx, DAT %08lx\n", __func__, base, con, dat);
533
534 return 0;
535 }
536
537 /*
538 * The next set of routines are for the case where the GPIO configuration
539 * registers are 4 bits per GPIO but there is more than one register (the
540 * bank has more than 8 GPIOs.
541 *
542 * This case is the similar to the 4 bit case, but the registers are as
543 * follows:
544 *
545 * base + 0x00: Control register, 4 bits per gpio (lower 8 GPIOs)
546 * gpio n: 4 bits starting at (4*n)
547 * 0000 = input, 0001 = output, others mean special-function
548 * base + 0x04: Control register, 4 bits per gpio (up to 8 additions GPIOs)
549 * gpio n: 4 bits starting at (4*n)
550 * 0000 = input, 0001 = output, others mean special-function
551 * base + 0x08: Data register, 1 bit per gpio
552 * bit n: data bit n
553 *
554 * To allow us to use the samsung_gpiolib_get and samsung_gpiolib_set
555 * routines we store the 'base + 0x4' address so that these routines see
556 * the data register at ourchip->base + 0x04.
557 */
558
559 static int samsung_gpiolib_4bit2_input(struct gpio_chip *chip,
560 unsigned int offset)
561 {
562 struct samsung_gpio_chip *ourchip = to_samsung_gpio(chip);
563 void __iomem *base = ourchip->base;
564 void __iomem *regcon = base;
565 unsigned long con;
566
567 if (offset > 7)
568 offset -= 8;
569 else
570 regcon -= 4;
571
572 con = __raw_readl(regcon);
573 con &= ~(0xf << con_4bit_shift(offset));
574 __raw_writel(con, regcon);
575
576 pr_debug("%s: %p: CON %08lx\n", __func__, base, con);
577
578 return 0;
579 }
580
581 static int samsung_gpiolib_4bit2_output(struct gpio_chip *chip,
582 unsigned int offset, int value)
583 {
584 struct samsung_gpio_chip *ourchip = to_samsung_gpio(chip);
585 void __iomem *base = ourchip->base;
586 void __iomem *regcon = base;
587 unsigned long con;
588 unsigned long dat;
589 unsigned con_offset = offset;
590
591 if (con_offset > 7)
592 con_offset -= 8;
593 else
594 regcon -= 4;
595
596 con = __raw_readl(regcon);
597 con &= ~(0xf << con_4bit_shift(con_offset));
598 con |= 0x1 << con_4bit_shift(con_offset);
599
600 dat = __raw_readl(base + GPIODAT_OFF);
601
602 if (value)
603 dat |= 1 << offset;
604 else
605 dat &= ~(1 << offset);
606
607 __raw_writel(dat, base + GPIODAT_OFF);
608 __raw_writel(con, regcon);
609 __raw_writel(dat, base + GPIODAT_OFF);
610
611 pr_debug("%s: %p: CON %08lx, DAT %08lx\n", __func__, base, con, dat);
612
613 return 0;
614 }
615
616 #ifdef CONFIG_PLAT_S3C24XX
617 /* The next set of routines are for the case of s3c24xx bank a */
618
619 static int s3c24xx_gpiolib_banka_input(struct gpio_chip *chip, unsigned offset)
620 {
621 return -EINVAL;
622 }
623
624 static int s3c24xx_gpiolib_banka_output(struct gpio_chip *chip,
625 unsigned offset, int value)
626 {
627 struct samsung_gpio_chip *ourchip = to_samsung_gpio(chip);
628 void __iomem *base = ourchip->base;
629 unsigned long flags;
630 unsigned long dat;
631 unsigned long con;
632
633 local_irq_save(flags);
634
635 con = __raw_readl(base + 0x00);
636 dat = __raw_readl(base + 0x04);
637
638 dat &= ~(1 << offset);
639 if (value)
640 dat |= 1 << offset;
641
642 __raw_writel(dat, base + 0x04);
643
644 con &= ~(1 << offset);
645
646 __raw_writel(con, base + 0x00);
647 __raw_writel(dat, base + 0x04);
648
649 local_irq_restore(flags);
650 return 0;
651 }
652 #endif
653
654 static void samsung_gpiolib_set(struct gpio_chip *chip,
655 unsigned offset, int value)
656 {
657 struct samsung_gpio_chip *ourchip = to_samsung_gpio(chip);
658 void __iomem *base = ourchip->base;
659 unsigned long flags;
660 unsigned long dat;
661
662 samsung_gpio_lock(ourchip, flags);
663
664 dat = __raw_readl(base + 0x04);
665 dat &= ~(1 << offset);
666 if (value)
667 dat |= 1 << offset;
668 __raw_writel(dat, base + 0x04);
669
670 samsung_gpio_unlock(ourchip, flags);
671 }
672
673 static int samsung_gpiolib_get(struct gpio_chip *chip, unsigned offset)
674 {
675 struct samsung_gpio_chip *ourchip = to_samsung_gpio(chip);
676 unsigned long val;
677
678 val = __raw_readl(ourchip->base + 0x04);
679 val >>= offset;
680 val &= 1;
681
682 return val;
683 }
684
685 /*
686 * CONFIG_S3C_GPIO_TRACK enables the tracking of the s3c specific gpios
687 * for use with the configuration calls, and other parts of the s3c gpiolib
688 * support code.
689 *
690 * Not all s3c support code will need this, as some configurations of cpu
691 * may only support one or two different configuration options and have an
692 * easy gpio to samsung_gpio_chip mapping function. If this is the case, then
693 * the machine support file should provide its own samsung_gpiolib_getchip()
694 * and any other necessary functions.
695 */
696
697 #ifdef CONFIG_S3C_GPIO_TRACK
698 struct samsung_gpio_chip *s3c_gpios[S3C_GPIO_END];
699
700 static __init void s3c_gpiolib_track(struct samsung_gpio_chip *chip)
701 {
702 unsigned int gpn;
703 int i;
704
705 gpn = chip->chip.base;
706 for (i = 0; i < chip->chip.ngpio; i++, gpn++) {
707 BUG_ON(gpn >= ARRAY_SIZE(s3c_gpios));
708 s3c_gpios[gpn] = chip;
709 }
710 }
711 #endif /* CONFIG_S3C_GPIO_TRACK */
712
713 /*
714 * samsung_gpiolib_add() - add the Samsung gpio_chip.
715 * @chip: The chip to register
716 *
717 * This is a wrapper to gpiochip_add() that takes our specific gpio chip
718 * information and makes the necessary alterations for the platform and
719 * notes the information for use with the configuration systems and any
720 * other parts of the system.
721 */
722
723 static void __init samsung_gpiolib_add(struct samsung_gpio_chip *chip)
724 {
725 struct gpio_chip *gc = &chip->chip;
726 int ret;
727
728 BUG_ON(!chip->base);
729 BUG_ON(!gc->label);
730 BUG_ON(!gc->ngpio);
731
732 spin_lock_init(&chip->lock);
733
734 if (!gc->direction_input)
735 gc->direction_input = samsung_gpiolib_2bit_input;
736 if (!gc->direction_output)
737 gc->direction_output = samsung_gpiolib_2bit_output;
738 if (!gc->set)
739 gc->set = samsung_gpiolib_set;
740 if (!gc->get)
741 gc->get = samsung_gpiolib_get;
742
743 #ifdef CONFIG_PM
744 if (chip->pm != NULL) {
745 if (!chip->pm->save || !chip->pm->resume)
746 pr_err("gpio: %s has missing PM functions\n",
747 gc->label);
748 } else
749 pr_err("gpio: %s has no PM function\n", gc->label);
750 #endif
751
752 /* gpiochip_add() prints own failure message on error. */
753 ret = gpiochip_add_data(gc, chip);
754 if (ret >= 0)
755 s3c_gpiolib_track(chip);
756 }
757
758 static void __init s3c24xx_gpiolib_add_chips(struct samsung_gpio_chip *chip,
759 int nr_chips, void __iomem *base)
760 {
761 int i;
762 struct gpio_chip *gc = &chip->chip;
763
764 for (i = 0 ; i < nr_chips; i++, chip++) {
765 /* skip banks not present on SoC */
766 if (chip->chip.base >= S3C_GPIO_END)
767 continue;
768
769 if (!chip->config)
770 chip->config = &s3c24xx_gpiocfg_default;
771 if (!chip->pm)
772 chip->pm = __gpio_pm(&samsung_gpio_pm_2bit);
773 if ((base != NULL) && (chip->base == NULL))
774 chip->base = base + ((i) * 0x10);
775
776 if (!gc->direction_input)
777 gc->direction_input = samsung_gpiolib_2bit_input;
778 if (!gc->direction_output)
779 gc->direction_output = samsung_gpiolib_2bit_output;
780
781 samsung_gpiolib_add(chip);
782 }
783 }
784
785 static void __init samsung_gpiolib_add_2bit_chips(struct samsung_gpio_chip *chip,
786 int nr_chips, void __iomem *base,
787 unsigned int offset)
788 {
789 int i;
790
791 for (i = 0 ; i < nr_chips; i++, chip++) {
792 chip->chip.direction_input = samsung_gpiolib_2bit_input;
793 chip->chip.direction_output = samsung_gpiolib_2bit_output;
794
795 if (!chip->config)
796 chip->config = &samsung_gpio_cfgs[7];
797 if (!chip->pm)
798 chip->pm = __gpio_pm(&samsung_gpio_pm_2bit);
799 if ((base != NULL) && (chip->base == NULL))
800 chip->base = base + ((i) * offset);
801
802 samsung_gpiolib_add(chip);
803 }
804 }
805
806 /*
807 * samsung_gpiolib_add_4bit_chips - 4bit single register GPIO config.
808 * @chip: The gpio chip that is being configured.
809 * @nr_chips: The no of chips (gpio ports) for the GPIO being configured.
810 *
811 * This helper deal with the GPIO cases where the control register has 4 bits
812 * of control per GPIO, generally in the form of:
813 * 0000 = Input
814 * 0001 = Output
815 * others = Special functions (dependent on bank)
816 *
817 * Note, since the code to deal with the case where there are two control
818 * registers instead of one, we do not have a separate set of function
819 * (samsung_gpiolib_add_4bit2_chips)for each case.
820 */
821
822 static void __init samsung_gpiolib_add_4bit_chips(struct samsung_gpio_chip *chip,
823 int nr_chips, void __iomem *base)
824 {
825 int i;
826
827 for (i = 0 ; i < nr_chips; i++, chip++) {
828 chip->chip.direction_input = samsung_gpiolib_4bit_input;
829 chip->chip.direction_output = samsung_gpiolib_4bit_output;
830
831 if (!chip->config)
832 chip->config = &samsung_gpio_cfgs[2];
833 if (!chip->pm)
834 chip->pm = __gpio_pm(&samsung_gpio_pm_4bit);
835 if ((base != NULL) && (chip->base == NULL))
836 chip->base = base + ((i) * 0x20);
837
838 chip->bitmap_gpio_int = 0;
839
840 samsung_gpiolib_add(chip);
841 }
842 }
843
844 static void __init samsung_gpiolib_add_4bit2_chips(struct samsung_gpio_chip *chip,
845 int nr_chips)
846 {
847 for (; nr_chips > 0; nr_chips--, chip++) {
848 chip->chip.direction_input = samsung_gpiolib_4bit2_input;
849 chip->chip.direction_output = samsung_gpiolib_4bit2_output;
850
851 if (!chip->config)
852 chip->config = &samsung_gpio_cfgs[2];
853 if (!chip->pm)
854 chip->pm = __gpio_pm(&samsung_gpio_pm_4bit);
855
856 samsung_gpiolib_add(chip);
857 }
858 }
859
860 int samsung_gpiolib_to_irq(struct gpio_chip *chip, unsigned int offset)
861 {
862 struct samsung_gpio_chip *samsung_chip = gpiochip_get_data(chip);
863
864 return samsung_chip->irq_base + offset;
865 }
866
867 #ifdef CONFIG_PLAT_S3C24XX
868 static int s3c24xx_gpiolib_fbank_to_irq(struct gpio_chip *chip, unsigned offset)
869 {
870 if (offset < 4) {
871 if (soc_is_s3c2412())
872 return IRQ_EINT0_2412 + offset;
873 else
874 return IRQ_EINT0 + offset;
875 }
876
877 if (offset < 8)
878 return IRQ_EINT4 + offset - 4;
879
880 return -EINVAL;
881 }
882 #endif
883
884 #ifdef CONFIG_ARCH_S3C64XX
885 static int s3c64xx_gpiolib_mbank_to_irq(struct gpio_chip *chip, unsigned pin)
886 {
887 return pin < 5 ? IRQ_EINT(23) + pin : -ENXIO;
888 }
889
890 static int s3c64xx_gpiolib_lbank_to_irq(struct gpio_chip *chip, unsigned pin)
891 {
892 return pin >= 8 ? IRQ_EINT(16) + pin - 8 : -ENXIO;
893 }
894 #endif
895
896 struct samsung_gpio_chip s3c24xx_gpios[] = {
897 #ifdef CONFIG_PLAT_S3C24XX
898 {
899 .config = &s3c24xx_gpiocfg_banka,
900 .chip = {
901 .base = S3C2410_GPA(0),
902 .owner = THIS_MODULE,
903 .label = "GPIOA",
904 .ngpio = 27,
905 .direction_input = s3c24xx_gpiolib_banka_input,
906 .direction_output = s3c24xx_gpiolib_banka_output,
907 },
908 }, {
909 .chip = {
910 .base = S3C2410_GPB(0),
911 .owner = THIS_MODULE,
912 .label = "GPIOB",
913 .ngpio = 11,
914 },
915 }, {
916 .chip = {
917 .base = S3C2410_GPC(0),
918 .owner = THIS_MODULE,
919 .label = "GPIOC",
920 .ngpio = 16,
921 },
922 }, {
923 .chip = {
924 .base = S3C2410_GPD(0),
925 .owner = THIS_MODULE,
926 .label = "GPIOD",
927 .ngpio = 16,
928 },
929 }, {
930 .chip = {
931 .base = S3C2410_GPE(0),
932 .label = "GPIOE",
933 .owner = THIS_MODULE,
934 .ngpio = 16,
935 },
936 }, {
937 .chip = {
938 .base = S3C2410_GPF(0),
939 .owner = THIS_MODULE,
940 .label = "GPIOF",
941 .ngpio = 8,
942 .to_irq = s3c24xx_gpiolib_fbank_to_irq,
943 },
944 }, {
945 .irq_base = IRQ_EINT8,
946 .chip = {
947 .base = S3C2410_GPG(0),
948 .owner = THIS_MODULE,
949 .label = "GPIOG",
950 .ngpio = 16,
951 .to_irq = samsung_gpiolib_to_irq,
952 },
953 }, {
954 .chip = {
955 .base = S3C2410_GPH(0),
956 .owner = THIS_MODULE,
957 .label = "GPIOH",
958 .ngpio = 15,
959 },
960 },
961 /* GPIOS for the S3C2443 and later devices. */
962 {
963 .base = S3C2440_GPJCON,
964 .chip = {
965 .base = S3C2410_GPJ(0),
966 .owner = THIS_MODULE,
967 .label = "GPIOJ",
968 .ngpio = 16,
969 },
970 }, {
971 .base = S3C2443_GPKCON,
972 .chip = {
973 .base = S3C2410_GPK(0),
974 .owner = THIS_MODULE,
975 .label = "GPIOK",
976 .ngpio = 16,
977 },
978 }, {
979 .base = S3C2443_GPLCON,
980 .chip = {
981 .base = S3C2410_GPL(0),
982 .owner = THIS_MODULE,
983 .label = "GPIOL",
984 .ngpio = 15,
985 },
986 }, {
987 .base = S3C2443_GPMCON,
988 .chip = {
989 .base = S3C2410_GPM(0),
990 .owner = THIS_MODULE,
991 .label = "GPIOM",
992 .ngpio = 2,
993 },
994 },
995 #endif
996 };
997
998 /*
999 * GPIO bank summary:
1000 *
1001 * Bank GPIOs Style SlpCon ExtInt Group
1002 * A 8 4Bit Yes 1
1003 * B 7 4Bit Yes 1
1004 * C 8 4Bit Yes 2
1005 * D 5 4Bit Yes 3
1006 * E 5 4Bit Yes None
1007 * F 16 2Bit Yes 4 [1]
1008 * G 7 4Bit Yes 5
1009 * H 10 4Bit[2] Yes 6
1010 * I 16 2Bit Yes None
1011 * J 12 2Bit Yes None
1012 * K 16 4Bit[2] No None
1013 * L 15 4Bit[2] No None
1014 * M 6 4Bit No IRQ_EINT
1015 * N 16 2Bit No IRQ_EINT
1016 * O 16 2Bit Yes 7
1017 * P 15 2Bit Yes 8
1018 * Q 9 2Bit Yes 9
1019 *
1020 * [1] BANKF pins 14,15 do not form part of the external interrupt sources
1021 * [2] BANK has two control registers, GPxCON0 and GPxCON1
1022 */
1023
1024 static struct samsung_gpio_chip s3c64xx_gpios_4bit[] = {
1025 #ifdef CONFIG_ARCH_S3C64XX
1026 {
1027 .chip = {
1028 .base = S3C64XX_GPA(0),
1029 .ngpio = S3C64XX_GPIO_A_NR,
1030 .label = "GPA",
1031 },
1032 }, {
1033 .chip = {
1034 .base = S3C64XX_GPB(0),
1035 .ngpio = S3C64XX_GPIO_B_NR,
1036 .label = "GPB",
1037 },
1038 }, {
1039 .chip = {
1040 .base = S3C64XX_GPC(0),
1041 .ngpio = S3C64XX_GPIO_C_NR,
1042 .label = "GPC",
1043 },
1044 }, {
1045 .chip = {
1046 .base = S3C64XX_GPD(0),
1047 .ngpio = S3C64XX_GPIO_D_NR,
1048 .label = "GPD",
1049 },
1050 }, {
1051 .config = &samsung_gpio_cfgs[0],
1052 .chip = {
1053 .base = S3C64XX_GPE(0),
1054 .ngpio = S3C64XX_GPIO_E_NR,
1055 .label = "GPE",
1056 },
1057 }, {
1058 .base = S3C64XX_GPG_BASE,
1059 .chip = {
1060 .base = S3C64XX_GPG(0),
1061 .ngpio = S3C64XX_GPIO_G_NR,
1062 .label = "GPG",
1063 },
1064 }, {
1065 .base = S3C64XX_GPM_BASE,
1066 .config = &samsung_gpio_cfgs[1],
1067 .chip = {
1068 .base = S3C64XX_GPM(0),
1069 .ngpio = S3C64XX_GPIO_M_NR,
1070 .label = "GPM",
1071 .to_irq = s3c64xx_gpiolib_mbank_to_irq,
1072 },
1073 },
1074 #endif
1075 };
1076
1077 static struct samsung_gpio_chip s3c64xx_gpios_4bit2[] = {
1078 #ifdef CONFIG_ARCH_S3C64XX
1079 {
1080 .base = S3C64XX_GPH_BASE + 0x4,
1081 .chip = {
1082 .base = S3C64XX_GPH(0),
1083 .ngpio = S3C64XX_GPIO_H_NR,
1084 .label = "GPH",
1085 },
1086 }, {
1087 .base = S3C64XX_GPK_BASE + 0x4,
1088 .config = &samsung_gpio_cfgs[0],
1089 .chip = {
1090 .base = S3C64XX_GPK(0),
1091 .ngpio = S3C64XX_GPIO_K_NR,
1092 .label = "GPK",
1093 },
1094 }, {
1095 .base = S3C64XX_GPL_BASE + 0x4,
1096 .config = &samsung_gpio_cfgs[1],
1097 .chip = {
1098 .base = S3C64XX_GPL(0),
1099 .ngpio = S3C64XX_GPIO_L_NR,
1100 .label = "GPL",
1101 .to_irq = s3c64xx_gpiolib_lbank_to_irq,
1102 },
1103 },
1104 #endif
1105 };
1106
1107 static struct samsung_gpio_chip s3c64xx_gpios_2bit[] = {
1108 #ifdef CONFIG_ARCH_S3C64XX
1109 {
1110 .base = S3C64XX_GPF_BASE,
1111 .config = &samsung_gpio_cfgs[6],
1112 .chip = {
1113 .base = S3C64XX_GPF(0),
1114 .ngpio = S3C64XX_GPIO_F_NR,
1115 .label = "GPF",
1116 },
1117 }, {
1118 .config = &samsung_gpio_cfgs[7],
1119 .chip = {
1120 .base = S3C64XX_GPI(0),
1121 .ngpio = S3C64XX_GPIO_I_NR,
1122 .label = "GPI",
1123 },
1124 }, {
1125 .config = &samsung_gpio_cfgs[7],
1126 .chip = {
1127 .base = S3C64XX_GPJ(0),
1128 .ngpio = S3C64XX_GPIO_J_NR,
1129 .label = "GPJ",
1130 },
1131 }, {
1132 .config = &samsung_gpio_cfgs[6],
1133 .chip = {
1134 .base = S3C64XX_GPO(0),
1135 .ngpio = S3C64XX_GPIO_O_NR,
1136 .label = "GPO",
1137 },
1138 }, {
1139 .config = &samsung_gpio_cfgs[6],
1140 .chip = {
1141 .base = S3C64XX_GPP(0),
1142 .ngpio = S3C64XX_GPIO_P_NR,
1143 .label = "GPP",
1144 },
1145 }, {
1146 .config = &samsung_gpio_cfgs[6],
1147 .chip = {
1148 .base = S3C64XX_GPQ(0),
1149 .ngpio = S3C64XX_GPIO_Q_NR,
1150 .label = "GPQ",
1151 },
1152 }, {
1153 .base = S3C64XX_GPN_BASE,
1154 .irq_base = IRQ_EINT(0),
1155 .config = &samsung_gpio_cfgs[5],
1156 .chip = {
1157 .base = S3C64XX_GPN(0),
1158 .ngpio = S3C64XX_GPIO_N_NR,
1159 .label = "GPN",
1160 .to_irq = samsung_gpiolib_to_irq,
1161 },
1162 },
1163 #endif
1164 };
1165
1166 /* TODO: cleanup soc_is_* */
1167 static __init int samsung_gpiolib_init(void)
1168 {
1169 /*
1170 * Currently there are two drivers that can provide GPIO support for
1171 * Samsung SoCs. For device tree enabled platforms, the new
1172 * pinctrl-samsung driver is used, providing both GPIO and pin control
1173 * interfaces. For legacy (non-DT) platforms this driver is used.
1174 */
1175 if (of_have_populated_dt())
1176 return 0;
1177
1178 if (soc_is_s3c24xx()) {
1179 samsung_gpiolib_set_cfg(samsung_gpio_cfgs,
1180 ARRAY_SIZE(samsung_gpio_cfgs));
1181 s3c24xx_gpiolib_add_chips(s3c24xx_gpios,
1182 ARRAY_SIZE(s3c24xx_gpios), S3C24XX_VA_GPIO);
1183 } else if (soc_is_s3c64xx()) {
1184 samsung_gpiolib_set_cfg(samsung_gpio_cfgs,
1185 ARRAY_SIZE(samsung_gpio_cfgs));
1186 samsung_gpiolib_add_2bit_chips(s3c64xx_gpios_2bit,
1187 ARRAY_SIZE(s3c64xx_gpios_2bit),
1188 S3C64XX_VA_GPIO + 0xE0, 0x20);
1189 samsung_gpiolib_add_4bit_chips(s3c64xx_gpios_4bit,
1190 ARRAY_SIZE(s3c64xx_gpios_4bit),
1191 S3C64XX_VA_GPIO);
1192 samsung_gpiolib_add_4bit2_chips(s3c64xx_gpios_4bit2,
1193 ARRAY_SIZE(s3c64xx_gpios_4bit2));
1194 }
1195
1196 return 0;
1197 }
1198 core_initcall(samsung_gpiolib_init);
1199
1200 int s3c_gpio_cfgpin(unsigned int pin, unsigned int config)
1201 {
1202 struct samsung_gpio_chip *chip = samsung_gpiolib_getchip(pin);
1203 unsigned long flags;
1204 int offset;
1205 int ret;
1206
1207 if (!chip)
1208 return -EINVAL;
1209
1210 offset = pin - chip->chip.base;
1211
1212 samsung_gpio_lock(chip, flags);
1213 ret = samsung_gpio_do_setcfg(chip, offset, config);
1214 samsung_gpio_unlock(chip, flags);
1215
1216 return ret;
1217 }
1218 EXPORT_SYMBOL(s3c_gpio_cfgpin);
1219
1220 int s3c_gpio_cfgpin_range(unsigned int start, unsigned int nr,
1221 unsigned int cfg)
1222 {
1223 int ret;
1224
1225 for (; nr > 0; nr--, start++) {
1226 ret = s3c_gpio_cfgpin(start, cfg);
1227 if (ret != 0)
1228 return ret;
1229 }
1230
1231 return 0;
1232 }
1233 EXPORT_SYMBOL_GPL(s3c_gpio_cfgpin_range);
1234
1235 int s3c_gpio_cfgall_range(unsigned int start, unsigned int nr,
1236 unsigned int cfg, samsung_gpio_pull_t pull)
1237 {
1238 int ret;
1239
1240 for (; nr > 0; nr--, start++) {
1241 s3c_gpio_setpull(start, pull);
1242 ret = s3c_gpio_cfgpin(start, cfg);
1243 if (ret != 0)
1244 return ret;
1245 }
1246
1247 return 0;
1248 }
1249 EXPORT_SYMBOL_GPL(s3c_gpio_cfgall_range);
1250
1251 unsigned s3c_gpio_getcfg(unsigned int pin)
1252 {
1253 struct samsung_gpio_chip *chip = samsung_gpiolib_getchip(pin);
1254 unsigned long flags;
1255 unsigned ret = 0;
1256 int offset;
1257
1258 if (chip) {
1259 offset = pin - chip->chip.base;
1260
1261 samsung_gpio_lock(chip, flags);
1262 ret = samsung_gpio_do_getcfg(chip, offset);
1263 samsung_gpio_unlock(chip, flags);
1264 }
1265
1266 return ret;
1267 }
1268 EXPORT_SYMBOL(s3c_gpio_getcfg);
1269
1270 int s3c_gpio_setpull(unsigned int pin, samsung_gpio_pull_t pull)
1271 {
1272 struct samsung_gpio_chip *chip = samsung_gpiolib_getchip(pin);
1273 unsigned long flags;
1274 int offset, ret;
1275
1276 if (!chip)
1277 return -EINVAL;
1278
1279 offset = pin - chip->chip.base;
1280
1281 samsung_gpio_lock(chip, flags);
1282 ret = samsung_gpio_do_setpull(chip, offset, pull);
1283 samsung_gpio_unlock(chip, flags);
1284
1285 return ret;
1286 }
1287 EXPORT_SYMBOL(s3c_gpio_setpull);
1288
1289 samsung_gpio_pull_t s3c_gpio_getpull(unsigned int pin)
1290 {
1291 struct samsung_gpio_chip *chip = samsung_gpiolib_getchip(pin);
1292 unsigned long flags;
1293 int offset;
1294 u32 pup = 0;
1295
1296 if (chip) {
1297 offset = pin - chip->chip.base;
1298
1299 samsung_gpio_lock(chip, flags);
1300 pup = samsung_gpio_do_getpull(chip, offset);
1301 samsung_gpio_unlock(chip, flags);
1302 }
1303
1304 return (__force samsung_gpio_pull_t)pup;
1305 }
1306 EXPORT_SYMBOL(s3c_gpio_getpull);
1307
1308 #ifdef CONFIG_PLAT_S3C24XX
1309 unsigned int s3c2410_modify_misccr(unsigned int clear, unsigned int change)
1310 {
1311 unsigned long flags;
1312 unsigned long misccr;
1313
1314 local_irq_save(flags);
1315 misccr = __raw_readl(S3C24XX_MISCCR);
1316 misccr &= ~clear;
1317 misccr ^= change;
1318 __raw_writel(misccr, S3C24XX_MISCCR);
1319 local_irq_restore(flags);
1320
1321 return misccr;
1322 }
1323 EXPORT_SYMBOL(s3c2410_modify_misccr);
1324 #endif
Linux with added FPC-III support