1 /* linux/arch/arm/plat-s3c24xx/gpio.c
2 *
3 * Copyright (c) 2004-2010 Simtec Electronics
4 * Ben Dooks <ben@simtec.co.uk>
5 *
6 * S3C24XX GPIO support
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22
23 #include <linux/kernel.h>
24 #include <linux/init.h>
25 #include <linux/module.h>
26 #include <linux/interrupt.h>
27 #include <linux/ioport.h>
28 #include <linux/gpio.h>
29 #include <linux/io.h>
30
31 #include <mach/hardware.h>
32 #include <mach/gpio-fns.h>
33 #include <asm/irq.h>
34
35 #include <mach/regs-gpio.h>
36
37 #include <plat/gpio-core.h>
38
39 /* gpiolib wrappers until these are totally eliminated */
40
s3c2410_gpio_pullup(unsigned int pin,unsigned int to)41 void s3c2410_gpio_pullup(unsigned int pin, unsigned int to)
42 {
43 int ret;
44
45 WARN_ON(to); /* should be none of these left */
46
47 if (!to) {
48 /* if pull is enabled, try first with up, and if that
49 * fails, try using down */
50
51 ret = s3c_gpio_setpull(pin, S3C_GPIO_PULL_UP);
52 if (ret)
53 s3c_gpio_setpull(pin, S3C_GPIO_PULL_DOWN);
54 } else {
55 s3c_gpio_setpull(pin, S3C_GPIO_PULL_NONE);
56 }
57 }
58 EXPORT_SYMBOL(s3c2410_gpio_pullup);
59
s3c2410_gpio_setpin(unsigned int pin,unsigned int to)60 void s3c2410_gpio_setpin(unsigned int pin, unsigned int to)
61 {
62 /* do this via gpiolib until all users removed */
63
64 gpio_request(pin, "temporary");
65 gpio_set_value(pin, to);
66 gpio_free(pin);
67 }
68
69 EXPORT_SYMBOL(s3c2410_gpio_setpin);
70
s3c2410_gpio_getpin(unsigned int pin)71 unsigned int s3c2410_gpio_getpin(unsigned int pin)
72 {
73 struct s3c_gpio_chip *chip = s3c_gpiolib_getchip(pin);
74 unsigned long offs = pin - chip->chip.base;
75
76 return __raw_readl(chip->base + 0x04) & (1<< offs);
77 }
78
79 EXPORT_SYMBOL(s3c2410_gpio_getpin);
80
s3c2410_modify_misccr(unsigned int clear,unsigned int change)81 unsigned int s3c2410_modify_misccr(unsigned int clear, unsigned int change)
82 {
83 unsigned long flags;
84 unsigned long misccr;
85
86 local_irq_save(flags);
87 misccr = __raw_readl(S3C24XX_MISCCR);
88 misccr &= ~clear;
89 misccr ^= change;
90 __raw_writel(misccr, S3C24XX_MISCCR);
91 local_irq_restore(flags);
92
93 return misccr;
94 }
95
96 EXPORT_SYMBOL(s3c2410_modify_misccr);
97