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kernel/linux-imx6_3.14.28/drivers/bcma/driver_gpio.c 5.83 KB
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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/irq.h>
  #include <linux/interrupt.h>
  #include <linux/irqdomain.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);
  }
  
  #if IS_BUILTIN(CONFIG_BCMA_HOST_SOC)
  static int bcma_gpio_to_irq(struct gpio_chip *chip, unsigned gpio)
  {
  	struct bcma_drv_cc *cc = bcma_gpio_get_cc(chip);
  
  	if (cc->core->bus->hosttype == BCMA_HOSTTYPE_SOC)
  		return irq_find_mapping(cc->irq_domain, gpio);
  	else
  		return -EINVAL;
  }
  
  static void bcma_gpio_irq_unmask(struct irq_data *d)
  {
  	struct bcma_drv_cc *cc = irq_data_get_irq_chip_data(d);
  	int gpio = irqd_to_hwirq(d);
  	u32 val = bcma_chipco_gpio_in(cc, BIT(gpio));
  
  	bcma_chipco_gpio_polarity(cc, BIT(gpio), val);
  	bcma_chipco_gpio_intmask(cc, BIT(gpio), BIT(gpio));
  }
  
  static void bcma_gpio_irq_mask(struct irq_data *d)
  {
  	struct bcma_drv_cc *cc = irq_data_get_irq_chip_data(d);
  	int gpio = irqd_to_hwirq(d);
  
  	bcma_chipco_gpio_intmask(cc, BIT(gpio), 0);
  }
  
  static struct irq_chip bcma_gpio_irq_chip = {
  	.name		= "BCMA-GPIO",
  	.irq_mask	= bcma_gpio_irq_mask,
  	.irq_unmask	= bcma_gpio_irq_unmask,
  };
  
  static irqreturn_t bcma_gpio_irq_handler(int irq, void *dev_id)
  {
  	struct bcma_drv_cc *cc = dev_id;
  	u32 val = bcma_cc_read32(cc, BCMA_CC_GPIOIN);
  	u32 mask = bcma_cc_read32(cc, BCMA_CC_GPIOIRQ);
  	u32 pol = bcma_cc_read32(cc, BCMA_CC_GPIOPOL);
  	unsigned long irqs = (val ^ pol) & mask;
  	int gpio;
  
  	if (!irqs)
  		return IRQ_NONE;
  
  	for_each_set_bit(gpio, &irqs, cc->gpio.ngpio)
  		generic_handle_irq(bcma_gpio_to_irq(&cc->gpio, gpio));
  	bcma_chipco_gpio_polarity(cc, irqs, val & irqs);
  
  	return IRQ_HANDLED;
  }
  
  static int bcma_gpio_irq_domain_init(struct bcma_drv_cc *cc)
  {
  	struct gpio_chip *chip = &cc->gpio;
  	int gpio, hwirq, err;
  
  	if (cc->core->bus->hosttype != BCMA_HOSTTYPE_SOC)
  		return 0;
  
  	cc->irq_domain = irq_domain_add_linear(NULL, chip->ngpio,
  					       &irq_domain_simple_ops, cc);
  	if (!cc->irq_domain) {
  		err = -ENODEV;
  		goto err_irq_domain;
  	}
  	for (gpio = 0; gpio < chip->ngpio; gpio++) {
  		int irq = irq_create_mapping(cc->irq_domain, gpio);
  
  		irq_set_chip_data(irq, cc);
  		irq_set_chip_and_handler(irq, &bcma_gpio_irq_chip,
  					 handle_simple_irq);
  	}
  
  	hwirq = bcma_core_irq(cc->core);
  	err = request_irq(hwirq, bcma_gpio_irq_handler, IRQF_SHARED, "gpio",
  			  cc);
  	if (err)
  		goto err_req_irq;
  
  	bcma_chipco_gpio_intmask(cc, ~0, 0);
  	bcma_cc_set32(cc, BCMA_CC_IRQMASK, BCMA_CC_IRQ_GPIO);
  
  	return 0;
  
  err_req_irq:
  	for (gpio = 0; gpio < chip->ngpio; gpio++) {
  		int irq = irq_find_mapping(cc->irq_domain, gpio);
  
  		irq_dispose_mapping(irq);
  	}
  	irq_domain_remove(cc->irq_domain);
  err_irq_domain:
  	return err;
  }
  
  static void bcma_gpio_irq_domain_exit(struct bcma_drv_cc *cc)
  {
  	struct gpio_chip *chip = &cc->gpio;
  	int gpio;
  
  	if (cc->core->bus->hosttype != BCMA_HOSTTYPE_SOC)
  		return;
  
  	bcma_cc_mask32(cc, BCMA_CC_IRQMASK, ~BCMA_CC_IRQ_GPIO);
  	free_irq(bcma_core_irq(cc->core), cc);
  	for (gpio = 0; gpio < chip->ngpio; gpio++) {
  		int irq = irq_find_mapping(cc->irq_domain, gpio);
  
  		irq_dispose_mapping(irq);
  	}
  	irq_domain_remove(cc->irq_domain);
  }
  #else
  static int bcma_gpio_irq_domain_init(struct bcma_drv_cc *cc)
  {
  	return 0;
  }
  
  static void bcma_gpio_irq_domain_exit(struct bcma_drv_cc *cc)
  {
  }
  #endif
  
  int bcma_gpio_init(struct bcma_drv_cc *cc)
  {
  	struct gpio_chip *chip = &cc->gpio;
  	int err;
  
  	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;
  #if IS_BUILTIN(CONFIG_BCMA_HOST_SOC)
  	chip->to_irq		= bcma_gpio_to_irq;
  #endif
  	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;
  
  	err = bcma_gpio_irq_domain_init(cc);
  	if (err)
  		return err;
  
  	err = gpiochip_add(chip);
  	if (err) {
  		bcma_gpio_irq_domain_exit(cc);
  		return err;
  	}
  
  	return 0;
  }
  
  int bcma_gpio_unregister(struct bcma_drv_cc *cc)
  {
  	bcma_gpio_irq_domain_exit(cc);
  	return gpiochip_remove(&cc->gpio);
  }