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a21765a7 BD |
1 | /* linux/arch/arm/plat-s3c24xx/gpio.c |
2 | * | |
31da46d9 | 3 | * Copyright (c) 2004-2010 Simtec Electronics |
a21765a7 BD |
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 | ||
a21765a7 BD |
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> | |
31da46d9 | 28 | #include <linux/gpio.h> |
fced80c7 | 29 | #include <linux/io.h> |
a21765a7 | 30 | |
a09e64fb | 31 | #include <mach/hardware.h> |
365854af | 32 | #include <mach/gpio-fns.h> |
a21765a7 | 33 | #include <asm/irq.h> |
a21765a7 | 34 | |
a09e64fb | 35 | #include <mach/regs-gpio.h> |
a21765a7 | 36 | |
7987bd7a BD |
37 | #include <plat/gpio-core.h> |
38 | ||
31da46d9 BD |
39 | /* gpiolib wrappers until these are totally eliminated */ |
40 | ||
a21765a7 BD |
41 | void s3c2410_gpio_pullup(unsigned int pin, unsigned int to) |
42 | { | |
31da46d9 | 43 | int ret; |
a21765a7 | 44 | |
31da46d9 | 45 | WARN_ON(to); /* should be none of these left */ |
a21765a7 | 46 | |
31da46d9 BD |
47 | if (!to) { |
48 | /* if pull is enabled, try first with up, and if that | |
49 | * fails, try using down */ | |
a21765a7 | 50 | |
31da46d9 BD |
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 | } | |
a21765a7 | 57 | } |
a21765a7 BD |
58 | EXPORT_SYMBOL(s3c2410_gpio_pullup); |
59 | ||
60 | void s3c2410_gpio_setpin(unsigned int pin, unsigned int to) | |
61 | { | |
31da46d9 | 62 | /* do this via gpiolib until all users removed */ |
a21765a7 | 63 | |
31da46d9 BD |
64 | gpio_request(pin, "temporary"); |
65 | gpio_set_value(pin, to); | |
66 | gpio_free(pin); | |
a21765a7 BD |
67 | } |
68 | ||
69 | EXPORT_SYMBOL(s3c2410_gpio_setpin); | |
70 | ||
71 | unsigned int s3c2410_gpio_getpin(unsigned int pin) | |
72 | { | |
7987bd7a BD |
73 | struct s3c_gpio_chip *chip = s3c_gpiolib_getchip(pin); |
74 | unsigned long offs = pin - chip->chip.base; | |
a21765a7 | 75 | |
7987bd7a | 76 | return __raw_readl(chip->base + 0x04) & (1<< offs); |
a21765a7 BD |
77 | } |
78 | ||
79 | EXPORT_SYMBOL(s3c2410_gpio_getpin); | |
80 | ||
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); |