Re: [PATCH 4/5] gpio: omap: convert driver to use gpiolib irqchip

From: Santosh Shilimkar <santosh.shilimkar@ti.com>
To: Javier Martinez Canillas <javier.martinez@collabora.co.uk>,
	Linus Walleij <linus.walleij@linaro.org>
Cc: Kevin Hilman <khilman@linaro.org>,
	Tony Lindgren <tony@atomide.com>, Paul Walmsley <paul@pwsan.com>,
	Aaro Koskinen <aaro.koskinen@iki.fi>, Nishanth Menon <nm@ti.com>,
	linux-gpio@vger.kernel.org, linux-omap@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 4/5] gpio: omap: convert driver to use gpiolib irqchip
Date: Thu, 10 Apr 2014 13:39:36 -0400	[thread overview]
Message-ID: <5346D758.5020103@ti.com> (raw)
In-Reply-To: <1396796297-13002-5-git-send-email-javier.martinez@collabora.co.uk>

On Sunday 06 April 2014 10:58 AM, Javier Martinez Canillas wrote:
> Converts the GPIO OMAP driver to register its chained irq
> handler and irqchip using the helpers in the gpiolib core.
> 
> Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
> ---
>  drivers/gpio/Kconfig     |   1 +
>  drivers/gpio/gpio-omap.c | 107 ++++++++++++++++++++++-------------------------
>  2 files changed, 52 insertions(+), 56 deletions(-)
> 
> diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
> index bfe5cf0..2092b1d 100644
> --- a/drivers/gpio/Kconfig
> +++ b/drivers/gpio/Kconfig
> @@ -247,6 +247,7 @@ config GPIO_OMAP
>  	bool "TI OMAP GPIO support"
>  	default y if ARCH_OMAP
>  	depends on ARM && ARCH_OMAP
> +	select GPIOLIB_IRQCHIP
>  	help
>  	  Say yes here to enable GPIO support for TI OMAP SoCs.
>  
> diff --git a/drivers/gpio/gpio-omap.c b/drivers/gpio/gpio-omap.c
> index e717888..8cc9e91 100644
> --- a/drivers/gpio/gpio-omap.c
> +++ b/drivers/gpio/gpio-omap.c
> @@ -24,7 +24,6 @@
>  #include <linux/pm.h>
>  #include <linux/of.h>
>  #include <linux/of_device.h>
> -#include <linux/irqdomain.h>
>  #include <linux/irqchip/chained_irq.h>
>  #include <linux/gpio.h>
>  #include <linux/platform_data/gpio-omap.h>
> @@ -52,7 +51,6 @@ struct gpio_bank {
>  	struct list_head node;
>  	void __iomem *base;
>  	u16 irq;
> -	struct irq_domain *domain;
>  	u32 non_wakeup_gpios;
>  	u32 enabled_non_wakeup_gpios;
>  	struct gpio_regs context;
> @@ -95,11 +93,10 @@ static int irq_to_gpio(struct gpio_bank *bank, unsigned int gpio_irq)
>  	return bank->chip.base + gpio_irq;
>  }
>  
> -static int omap_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
> +static inline struct gpio_bank *_irq_data_get_bank(struct irq_data *d)
>  {
> -	struct gpio_bank *bank = container_of(chip, struct gpio_bank, chip);
> -
> -	return irq_find_mapping(bank->domain, offset);
> +	struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
> +	return container_of(chip, struct gpio_bank, chip);
>  }
>  
>  static void _set_gpio_direction(struct gpio_bank *bank, int gpio, int is_input)
> @@ -479,7 +476,7 @@ static int gpio_is_input(struct gpio_bank *bank, int mask)
>  
>  static int gpio_irq_type(struct irq_data *d, unsigned type)
>  {
> -	struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
> +	struct gpio_bank *bank = _irq_data_get_bank(d);
>  	unsigned gpio = 0;
>  	int retval;
>  	unsigned long flags;
> @@ -514,14 +511,6 @@ static int gpio_irq_type(struct irq_data *d, unsigned type)
>  		return -EINVAL;
>  	}
>  
> -	retval = gpio_lock_as_irq(&bank->chip, offset);
> -	if (retval) {
> -		dev_err(bank->dev, "unable to lock offset %d for IRQ\n",
> -			offset);
> -		spin_unlock_irqrestore(&bank->lock, flags);
> -		return retval;
> -	}
> -
>  	bank->irq_usage |= 1 << GPIO_INDEX(bank, gpio);
>  	spin_unlock_irqrestore(&bank->lock, flags);
>  
> @@ -664,7 +653,7 @@ static void _reset_gpio(struct gpio_bank *bank, int gpio)
>  /* Use disable_irq_wake() and enable_irq_wake() functions from drivers */
>  static int gpio_wake_enable(struct irq_data *d, unsigned int enable)
>  {
> -	struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
> +	struct gpio_bank *bank = _irq_data_get_bank(d);
>  	unsigned int gpio = irq_to_gpio(bank, d->hwirq);
>  
>  	return _set_gpio_wakeup(bank, gpio, enable);
> @@ -732,11 +721,12 @@ static void gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
>  	unsigned int bit;
>  	struct gpio_bank *bank;
>  	int unmasked = 0;
> -	struct irq_chip *chip = irq_desc_get_chip(desc);
> +	struct irq_chip *irqchip = irq_desc_get_chip(desc);
> +	struct gpio_chip *chip = irq_get_handler_data(irq);
>  
> -	chained_irq_enter(chip, desc);
> +	chained_irq_enter(irqchip, desc);
>  
> -	bank = irq_get_handler_data(irq);
> +	bank = container_of(chip, struct gpio_bank, chip);
>  	isr_reg = bank->base + bank->regs->irqstatus;
>  	pm_runtime_get_sync(bank->dev);
>  
> @@ -764,7 +754,7 @@ static void gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
>  		configured, we could unmask GPIO bank interrupt immediately */
>  		if (!level_mask && !unmasked) {
>  			unmasked = 1;
> -			chained_irq_exit(chip, desc);
> +			chained_irq_exit(irqchip, desc);
>  		}
>  
>  		if (!isr)
> @@ -784,7 +774,8 @@ static void gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
>  			if (bank->toggle_mask & (1 << bit))
>  				_toggle_gpio_edge_triggering(bank, bit);
>  
> -			generic_handle_irq(irq_find_mapping(bank->domain, bit));
> +			generic_handle_irq(irq_find_mapping(bank->chip.irqdomain,
> +							    bit));
>  		}
>  	}
>  	/* if bank has any level sensitive GPIO pin interrupt
> @@ -793,13 +784,13 @@ static void gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
>  	interrupt */
>  exit:
>  	if (!unmasked)
> -		chained_irq_exit(chip, desc);
> +		chained_irq_exit(irqchip, desc);
>  	pm_runtime_put(bank->dev);
>  }
>  
>  static void gpio_irq_shutdown(struct irq_data *d)
>  {
> -	struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
> +	struct gpio_bank *bank = _irq_data_get_bank(d);
>  	unsigned int gpio = irq_to_gpio(bank, d->hwirq);
>  	unsigned long flags;
>  	unsigned offset = GPIO_INDEX(bank, gpio);
> @@ -821,7 +812,7 @@ static void gpio_irq_shutdown(struct irq_data *d)
>  
>  static void gpio_ack_irq(struct irq_data *d)
>  {
> -	struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
> +	struct gpio_bank *bank = _irq_data_get_bank(d);
>  	unsigned int gpio = irq_to_gpio(bank, d->hwirq);
>  
>  	_clear_gpio_irqstatus(bank, gpio);
> @@ -829,7 +820,7 @@ static void gpio_ack_irq(struct irq_data *d)
>  
>  static void gpio_mask_irq(struct irq_data *d)
>  {
> -	struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
> +	struct gpio_bank *bank = _irq_data_get_bank(d);
>  	unsigned int gpio = irq_to_gpio(bank, d->hwirq);
>  	unsigned long flags;
>  
> @@ -841,7 +832,7 @@ static void gpio_mask_irq(struct irq_data *d)
>  
>  static void gpio_unmask_irq(struct irq_data *d)
>  {
> -	struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
> +	struct gpio_bank *bank = _irq_data_get_bank(d);
>  	unsigned int gpio = irq_to_gpio(bank, d->hwirq);
>  	unsigned int irq_mask = GPIO_BIT(bank, gpio);
>  	u32 trigger = irqd_get_trigger_type(d);
> @@ -1085,6 +1076,7 @@ static int omap_gpio_chip_init(struct gpio_bank *bank)
>  {
>  	int j;
>  	static int gpio;
> +	int irq_base = 0;
>  	int ret;
>  
>  	/*
> @@ -1098,7 +1090,6 @@ static int omap_gpio_chip_init(struct gpio_bank *bank)
>  	bank->chip.direction_output = gpio_output;
>  	bank->chip.set_debounce = gpio_debounce;
>  	bank->chip.set = gpio_set;
> -	bank->chip.to_irq = omap_gpio_to_irq;
>  	if (bank->is_mpuio) {
>  		bank->chip.label = "mpuio";
>  		if (bank->regs->wkup_en)
> @@ -1113,24 +1104,46 @@ static int omap_gpio_chip_init(struct gpio_bank *bank)
>  
>  	ret = gpiochip_add(&bank->chip);
>  	if (ret) {
> -		dev_err(bank->dev, "Could not register gpio chip\n", ret);
> +		dev_err(bank->dev, "Could not register gpio chip %d\n", ret);
>  		return ret;
>  	}
>  
> +#ifdef CONFIG_ARCH_OMAP1
> +	/*
> +	 * REVISIT: Once we have OMAP1 supporting SPARSE_IRQ, we can drop
> +	 * irq_alloc_descs() since a base IRQ offset will no longer be needed.
> +	 */
> +	irq_base = irq_alloc_descs(-1, 0, bank->width, 0);
> +	if (irq_base < 0) {
> +		dev_err(bank->dev, "Couldn't allocate IRQ numbers\n");
> +		return -ENODEV;
> +	}
> +#endif
> +
Do we still need above after first patch ? Would be good
to get rid of above ugly #ifdef on the middle of the code.