| 1 | /* |
| 2 | * Infineon/ADMTek ADM8668 WildPass GPIO support |
| 3 | * |
| 4 | * Copyright (C) 2012 Florian Fainelli <florian@openwrt.org> |
| 5 | * |
| 6 | * Licensed under the terms of GPLv2. |
| 7 | * |
| 8 | */ |
| 9 | #include <linux/kernel.h> |
| 10 | #include <linux/gpio.h> |
| 11 | #include <linux/io.h> |
| 12 | |
| 13 | #include <adm8668.h> |
| 14 | |
| 15 | #define GPIO_MASK 0x3f |
| 16 | |
| 17 | #define GPIO_IN_OFS 0 |
| 18 | #define GPIO_OUT_OFS 6 |
| 19 | #define GPIO_OE_OFS 12 |
| 20 | |
| 21 | struct adm8668_gpio_chip { |
| 22 | void __iomem *base; |
| 23 | struct gpio_chip chip; |
| 24 | }; |
| 25 | |
| 26 | static int adm8668_gpio_dir_out(struct gpio_chip *chip, |
| 27 | unsigned offset, int value) |
| 28 | { |
| 29 | struct adm8668_gpio_chip *c = |
| 30 | container_of(chip, struct adm8668_gpio_chip, chip); |
| 31 | u32 mask; |
| 32 | |
| 33 | /* clear input, set output enable and output value */ |
| 34 | mask = __raw_readl(c->base); |
| 35 | mask &= ~(1 << offset); |
| 36 | mask |= (1 << (offset + GPIO_OE_OFS)); |
| 37 | if (value) |
| 38 | mask |= (1 << (offset + GPIO_OUT_OFS)); |
| 39 | else |
| 40 | mask &= ~(1 << (offset + GPIO_OUT_OFS)); |
| 41 | __raw_writel(mask, c->base); |
| 42 | |
| 43 | return 0; |
| 44 | } |
| 45 | |
| 46 | static int adm8668_gpio_dir_in(struct gpio_chip *chip, |
| 47 | unsigned offset) |
| 48 | { |
| 49 | struct adm8668_gpio_chip *c = |
| 50 | container_of(chip, struct adm8668_gpio_chip, chip); |
| 51 | u32 mask; |
| 52 | |
| 53 | mask = __raw_readl(c->base); |
| 54 | mask &= ~(((1 << (offset + GPIO_OE_OFS)) | (1 << (offset + GPIO_OUT_OFS)))); |
| 55 | mask |= (1 << offset); |
| 56 | __raw_writel(mask, c->base); |
| 57 | |
| 58 | return 0; |
| 59 | } |
| 60 | |
| 61 | static void adm8668_gpio_set(struct gpio_chip *chip, |
| 62 | unsigned offset, int value) |
| 63 | { |
| 64 | struct adm8668_gpio_chip *c = |
| 65 | container_of(chip, struct adm8668_gpio_chip, chip); |
| 66 | u32 mask; |
| 67 | |
| 68 | mask = __raw_readl(c->base); |
| 69 | if (value) |
| 70 | mask |= (1 << (offset + GPIO_OUT_OFS)); |
| 71 | else |
| 72 | mask &= ~(1 << (offset + GPIO_OUT_OFS)); |
| 73 | __raw_writel(mask, c->base); |
| 74 | } |
| 75 | |
| 76 | static int adm8668_gpio_get(struct gpio_chip *chip, |
| 77 | unsigned offset) |
| 78 | { |
| 79 | struct adm8668_gpio_chip *c = |
| 80 | container_of(chip, struct adm8668_gpio_chip, chip); |
| 81 | u32 value; |
| 82 | |
| 83 | value = __raw_readl(c->base) & GPIO_MASK; |
| 84 | |
| 85 | return value & (1 << offset); |
| 86 | } |
| 87 | |
| 88 | static struct adm8668_gpio_chip adm8668_gpio_cpu = { |
| 89 | .base = (void __iomem *)KSEG1ADDR(ADM8668_CONFIG_BASE + CRGPIO_REG), |
| 90 | .chip = { |
| 91 | .label = "adm8668-cpu-gpio", |
| 92 | .direction_output = adm8668_gpio_dir_out, |
| 93 | .direction_input = adm8668_gpio_dir_in, |
| 94 | .set = adm8668_gpio_set, |
| 95 | .get = adm8668_gpio_get, |
| 96 | .ngpio = 6, |
| 97 | }, |
| 98 | }; |
| 99 | |
| 100 | static struct adm8668_gpio_chip adm8668_gpio_wlan = { |
| 101 | .base = (void __iomem *)KSEG1ADDR(ADM8668_WLAN_BASE + GPIO_REG), |
| 102 | .chip = { |
| 103 | .label = "adm8668-wlan-gpio", |
| 104 | .direction_output = adm8668_gpio_dir_out, |
| 105 | .direction_input = adm8668_gpio_dir_in, |
| 106 | .set = adm8668_gpio_set, |
| 107 | .get = adm8668_gpio_get, |
| 108 | .ngpio = 6, |
| 109 | .base = 6, |
| 110 | }, |
| 111 | }; |
| 112 | |
| 113 | static int __init adm8668_gpio_init(void) |
| 114 | { |
| 115 | int ret; |
| 116 | |
| 117 | ret = gpiochip_add(&adm8668_gpio_cpu.chip); |
| 118 | if (ret) |
| 119 | return ret; |
| 120 | |
| 121 | return gpiochip_add(&adm8668_gpio_wlan.chip); |
| 122 | } |
| 123 | arch_initcall(adm8668_gpio_init); |
| 124 | |
