projects / mirror_ubuntu-artful-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 000af2c5 JW |
1 | /* |
| 2 | * s6000 gpio driver | |
| 3 | * | |
| 4 | * Copyright (c) 2009 emlix GmbH | |
| 5 | * Authors: Oskar Schirmer <os@emlix.com> | |
| 6 | * Johannes Weiner <jw@emlix.com> | |
| 7 | */ | |
| 8 | #include <linux/kernel.h> | |
| 9 | #include <linux/module.h> | |
| 10 | #include <linux/init.h> | |
| 11 | #include <linux/io.h> | |
| 12 | #include <linux/gpio.h> | |
| 13 | ||
| 14 | #include <variant/hardware.h> | |
| 15 | ||
| 16 | #define S6_GPIO_DATA 0x000 | |
| 17 | #define S6_GPIO_IS 0x404 | |
| 18 | #define S6_GPIO_IBE 0x408 | |
| 19 | #define S6_GPIO_IEV 0x40C | |
| 20 | #define S6_GPIO_IE 0x410 | |
| 21 | #define S6_GPIO_RIS 0x414 | |
| 22 | #define S6_GPIO_MIS 0x418 | |
| 23 | #define S6_GPIO_IC 0x41C | |
| 24 | #define S6_GPIO_AFSEL 0x420 | |
| 25 | #define S6_GPIO_DIR 0x800 | |
| 26 | #define S6_GPIO_BANK(nr) ((nr) * 0x1000) | |
| 27 | #define S6_GPIO_MASK(nr) (4 << (nr)) | |
| 28 | #define S6_GPIO_OFFSET(nr) \ | |
| 29 | (S6_GPIO_BANK((nr) >> 3) + S6_GPIO_MASK((nr) & 7)) | |
| 30 | ||
| 31 | static int direction_input(struct gpio_chip *chip, unsigned int off) | |
| 32 | { | |
| 33 | writeb(0, S6_REG_GPIO + S6_GPIO_DIR + S6_GPIO_OFFSET(off)); | |
| 34 | return 0; | |
| 35 | } | |
| 36 | ||
| 37 | static int get(struct gpio_chip *chip, unsigned int off) | |
| 38 | { | |
| 39 | return readb(S6_REG_GPIO + S6_GPIO_DATA + S6_GPIO_OFFSET(off)); | |
| 40 | } | |
| 41 | ||
| 42 | static int direction_output(struct gpio_chip *chip, unsigned int off, int val) | |
| 43 | { | |
| 44 | unsigned rel = S6_GPIO_OFFSET(off); | |
| 45 | writeb(~0, S6_REG_GPIO + S6_GPIO_DIR + rel); | |
| 46 | writeb(val ? ~0 : 0, S6_REG_GPIO + S6_GPIO_DATA + rel); | |
| 47 | return 0; | |
| 48 | } | |
| 49 | ||
| 50 | static void set(struct gpio_chip *chip, unsigned int off, int val) | |
| 51 | { | |
| 52 | writeb(val ? ~0 : 0, S6_REG_GPIO + S6_GPIO_DATA + S6_GPIO_OFFSET(off)); | |
| 53 | } | |
| 54 | ||
| 55 | static struct gpio_chip gpiochip = { | |
| 56 | .owner = THIS_MODULE, | |
| 57 | .direction_input = direction_input, | |
| 58 | .get = get, | |
| 59 | .direction_output = direction_output, | |
| 60 | .set = set, | |
| 61 | .base = 0, | |
| 62 | .ngpio = 24, | |
| 63 | .can_sleep = 0, /* no blocking io needed */ | |
| 64 | .exported = 0, /* no exporting to userspace */ | |
| 65 | }; | |
| 66 | ||
| 1fb137c1 | 67 | int s6_gpio_init(void) |
| 000af2c5 JW |
68 | { |
| 69 | return gpiochip_add(&gpiochip); | |
| 70 | } |