projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| cf0936b0 HM |
1 | /* |
| 2 | * Broadcom specific AMBA | |
| 3 | * GPIO driver | |
| 4 | * | |
| 5 | * Copyright 2011, Broadcom Corporation | |
| 6 | * Copyright 2012, Hauke Mehrtens <hauke@hauke-m.de> | |
| 7 | * | |
| 8 | * Licensed under the GNU/GPL. See COPYING for details. | |
| 9 | */ | |
| 10 | ||
| 11 | #include <linux/gpio.h> | |
| 12 | #include <linux/export.h> | |
| 13 | #include <linux/bcma/bcma.h> | |
| 14 | ||
| 15 | #include "bcma_private.h" | |
| 16 | ||
| 17 | static inline struct bcma_drv_cc *bcma_gpio_get_cc(struct gpio_chip *chip) | |
| 18 | { | |
| 19 | return container_of(chip, struct bcma_drv_cc, gpio); | |
| 20 | } | |
| 21 | ||
| 22 | static int bcma_gpio_get_value(struct gpio_chip *chip, unsigned gpio) | |
| 23 | { | |
| 24 | struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip); | |
| 25 | ||
| 26 | return !!bcma_chipco_gpio_in(cc, 1 << gpio); | |
| 27 | } | |
| 28 | ||
| 29 | static void bcma_gpio_set_value(struct gpio_chip *chip, unsigned gpio, | |
| 30 | int value) | |
| 31 | { | |
| 32 | struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip); | |
| 33 | ||
| 34 | bcma_chipco_gpio_out(cc, 1 << gpio, value ? 1 << gpio : 0); | |
| 35 | } | |
| 36 | ||
| 37 | static int bcma_gpio_direction_input(struct gpio_chip *chip, unsigned gpio) | |
| 38 | { | |
| 39 | struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip); | |
| 40 | ||
| 41 | bcma_chipco_gpio_outen(cc, 1 << gpio, 0); | |
| 42 | return 0; | |
| 43 | } | |
| 44 | ||
| 45 | static int bcma_gpio_direction_output(struct gpio_chip *chip, unsigned gpio, | |
| 46 | int value) | |
| 47 | { | |
| 48 | struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip); | |
| 49 | ||
| 50 | bcma_chipco_gpio_outen(cc, 1 << gpio, 1 << gpio); | |
| 51 | bcma_chipco_gpio_out(cc, 1 << gpio, value ? 1 << gpio : 0); | |
| 52 | return 0; | |
| 53 | } | |
| 54 | ||
| 55 | static int bcma_gpio_request(struct gpio_chip *chip, unsigned gpio) | |
| 56 | { | |
| 57 | struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip); | |
| 58 | ||
| 59 | bcma_chipco_gpio_control(cc, 1 << gpio, 0); | |
| 60 | /* clear pulldown */ | |
| 61 | bcma_chipco_gpio_pulldown(cc, 1 << gpio, 0); | |
| 62 | /* Set pullup */ | |
| 63 | bcma_chipco_gpio_pullup(cc, 1 << gpio, 1 << gpio); | |
| 64 | ||
| 65 | return 0; | |
| 66 | } | |
| 67 | ||
| 68 | static void bcma_gpio_free(struct gpio_chip *chip, unsigned gpio) | |
| 69 | { | |
| 70 | struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip); | |
| 71 | ||
| 72 | /* clear pullup */ | |
| 73 | bcma_chipco_gpio_pullup(cc, 1 << gpio, 0); | |
| 74 | } | |
| 75 | ||
| 76 | int bcma_gpio_init(struct bcma_drv_cc *cc) | |
| 77 | { | |
| 78 | struct gpio_chip *chip = &cc->gpio; | |
| 79 | ||
| 80 | chip->label = "bcma_gpio"; | |
| 81 | chip->owner = THIS_MODULE; | |
| 82 | chip->request = bcma_gpio_request; | |
| 83 | chip->free = bcma_gpio_free; | |
| 84 | chip->get = bcma_gpio_get_value; | |
| 85 | chip->set = bcma_gpio_set_value; | |
| 86 | chip->direction_input = bcma_gpio_direction_input; | |
| 87 | chip->direction_output = bcma_gpio_direction_output; | |
| 88 | chip->ngpio = 16; | |
| 89 | /* There is just one SoC in one device and its GPIO addresses should be | |
| 90 | * deterministic to address them more easily. The other buses could get | |
| 91 | * a random base number. */ | |
| 92 | if (cc->core->bus->hosttype == BCMA_HOSTTYPE_SOC) | |
| 93 | chip->base = 0; | |
| 94 | else | |
| 95 | chip->base = -1; | |
| 96 | ||
| 97 | return gpiochip_add(chip); | |
| 98 | } |