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- /*
- * Broadcom specific AMBA
- * GPIO driver
- *
- * Copyright 2011, Broadcom Corporation
- * Copyright 2012, Hauke Mehrtens <hauke@hauke-m.de>
- *
- * Licensed under the GNU/GPL. See COPYING for details.
- */
- #include <linux/gpio.h>
- #include <linux/export.h>
- #include <linux/bcma/bcma.h>
- #include "bcma_private.h"
- static inline struct bcma_drv_cc *bcma_gpio_get_cc(struct gpio_chip *chip)
- {
- return container_of(chip, struct bcma_drv_cc, gpio);
- }
- static int bcma_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
- {
- struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip);
- return !!bcma_chipco_gpio_in(cc, 1 << gpio);
- }
- static void bcma_gpio_set_value(struct gpio_chip *chip, unsigned gpio,
- int value)
- {
- struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip);
- bcma_chipco_gpio_out(cc, 1 << gpio, value ? 1 << gpio : 0);
- }
- static int bcma_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
- {
- struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip);
- bcma_chipco_gpio_outen(cc, 1 << gpio, 0);
- return 0;
- }
- static int bcma_gpio_direction_output(struct gpio_chip *chip, unsigned gpio,
- int value)
- {
- struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip);
- bcma_chipco_gpio_outen(cc, 1 << gpio, 1 << gpio);
- bcma_chipco_gpio_out(cc, 1 << gpio, value ? 1 << gpio : 0);
- return 0;
- }
- static int bcma_gpio_request(struct gpio_chip *chip, unsigned gpio)
- {
- struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip);
- bcma_chipco_gpio_control(cc, 1 << gpio, 0);
- /* clear pulldown */
- bcma_chipco_gpio_pulldown(cc, 1 << gpio, 0);
- /* Set pullup */
- bcma_chipco_gpio_pullup(cc, 1 << gpio, 1 << gpio);
- return 0;
- }
- static void bcma_gpio_free(struct gpio_chip *chip, unsigned gpio)
- {
- struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip);
- /* clear pullup */
- bcma_chipco_gpio_pullup(cc, 1 << gpio, 0);
- }
- int bcma_gpio_init(struct bcma_drv_cc *cc)
- {
- struct gpio_chip *chip = &cc->gpio;
- chip->label = "bcma_gpio";
- chip->owner = THIS_MODULE;
- chip->request = bcma_gpio_request;
- chip->free = bcma_gpio_free;
- chip->get = bcma_gpio_get_value;
- chip->set = bcma_gpio_set_value;
- chip->direction_input = bcma_gpio_direction_input;
- chip->direction_output = bcma_gpio_direction_output;
- chip->ngpio = 16;
- /* There is just one SoC in one device and its GPIO addresses should be
- * deterministic to address them more easily. The other buses could get
- * a random base number. */
- if (cc->core->bus->hosttype == BCMA_HOSTTYPE_SOC)
- chip->base = 0;
- else
- chip->base = -1;
- return gpiochip_add(chip);
- }
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