cf0936b06d
Register a GPIO driver to access the GPIOs provided by the chip. The GPIOs of the SoC should always start at 0 and the other GPIOs could start at a random position. There is just one SoC in a system and when they start at 0 the number is predictable. Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de> Patchwork: http://patchwork.linux-mips.org/patch/4587 Acked-by: Florian Fainelli <florian@openwrt.org>
98 lines
2.4 KiB
C
98 lines
2.4 KiB
C
/*
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* Broadcom specific AMBA
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* GPIO driver
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*
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* Copyright 2011, Broadcom Corporation
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* Copyright 2012, Hauke Mehrtens <hauke@hauke-m.de>
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*
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* Licensed under the GNU/GPL. See COPYING for details.
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*/
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#include <linux/gpio.h>
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#include <linux/export.h>
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#include <linux/bcma/bcma.h>
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#include "bcma_private.h"
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static inline struct bcma_drv_cc *bcma_gpio_get_cc(struct gpio_chip *chip)
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{
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return container_of(chip, struct bcma_drv_cc, gpio);
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}
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static int bcma_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
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{
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struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip);
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return !!bcma_chipco_gpio_in(cc, 1 << gpio);
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}
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static void bcma_gpio_set_value(struct gpio_chip *chip, unsigned gpio,
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int value)
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{
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struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip);
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bcma_chipco_gpio_out(cc, 1 << gpio, value ? 1 << gpio : 0);
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}
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static int bcma_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
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{
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struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip);
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bcma_chipco_gpio_outen(cc, 1 << gpio, 0);
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return 0;
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}
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static int bcma_gpio_direction_output(struct gpio_chip *chip, unsigned gpio,
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int value)
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{
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struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip);
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bcma_chipco_gpio_outen(cc, 1 << gpio, 1 << gpio);
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bcma_chipco_gpio_out(cc, 1 << gpio, value ? 1 << gpio : 0);
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return 0;
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}
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static int bcma_gpio_request(struct gpio_chip *chip, unsigned gpio)
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{
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struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip);
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bcma_chipco_gpio_control(cc, 1 << gpio, 0);
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/* clear pulldown */
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bcma_chipco_gpio_pulldown(cc, 1 << gpio, 0);
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/* Set pullup */
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bcma_chipco_gpio_pullup(cc, 1 << gpio, 1 << gpio);
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return 0;
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}
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static void bcma_gpio_free(struct gpio_chip *chip, unsigned gpio)
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{
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struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip);
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/* clear pullup */
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bcma_chipco_gpio_pullup(cc, 1 << gpio, 0);
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}
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int bcma_gpio_init(struct bcma_drv_cc *cc)
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{
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struct gpio_chip *chip = &cc->gpio;
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chip->label = "bcma_gpio";
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chip->owner = THIS_MODULE;
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chip->request = bcma_gpio_request;
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chip->free = bcma_gpio_free;
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chip->get = bcma_gpio_get_value;
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chip->set = bcma_gpio_set_value;
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chip->direction_input = bcma_gpio_direction_input;
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chip->direction_output = bcma_gpio_direction_output;
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chip->ngpio = 16;
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/* There is just one SoC in one device and its GPIO addresses should be
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* deterministic to address them more easily. The other buses could get
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* a random base number. */
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if (cc->core->bus->hosttype == BCMA_HOSTTYPE_SOC)
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chip->base = 0;
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else
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chip->base = -1;
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return gpiochip_add(chip);
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}
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