Message-ID: <20110603175020.GD15616@ponder.secretlab.ca>
Date:	Fri, 3 Jun 2011 11:50:20 -0600
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Viresh Kumar <viresh.kumar@...com>
Cc:	linux-arm-kernel@...ts.infradead.org, armando.visconti@...com,
	shiraz.hashim@...com, vipin.kumar@...com, rajeev-dlh.kumar@...com,
	deepak.sikri@...com, vipulkumar.samar@...com, amit.virdi@...com,
	pratyush.anand@...com, bhupesh.sharma@...com,
	viresh.linux@...il.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] gpio/spear-plgpio: Add plgpio driver for SPEAr
 platform

On Mon, May 30, 2011 at 12:09:02PM +0530, Viresh Kumar wrote:
> Plgpio pads on few spear machines can be configured as gpios. This patch adds
> support for configuring these PLGPIOs.
> 
> This was earlier posted & reviewed as part of arch/arm/plat-spear/ code.
> 
> Reviewed-by: Stanley Miao <stanley.miao@...driver.com>
> Signed-off-by: Viresh Kumar <viresh.kumar@...com>

Hi Viresh,

This ends up being yet-another-mmio-gpio implementation.  Please look
at bgpio_init() in drivers/basic_mmio_gpio.c.  This driver should be
refactored to use that.

g.

> ---
>  MAINTAINERS                  |    7 +
>  drivers/gpio/Kconfig         |    7 +
>  drivers/gpio/Makefile        |    1 +
>  drivers/gpio/spear-plgpio.c  |  490 ++++++++++++++++++++++++++++++++++++++++++
>  include/linux/spear-plgpio.h |   69 ++++++
>  5 files changed, 574 insertions(+), 0 deletions(-)
>  create mode 100644 drivers/gpio/spear-plgpio.c
>  create mode 100644 include/linux/spear-plgpio.h
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 29801f7..48b0a4f 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -5978,6 +5978,13 @@ F:	arch/arm/mach-spear3xx/spear3*0_evb.c
>  F:	arch/arm/mach-spear6xx/spear600.c
>  F:	arch/arm/mach-spear6xx/spear600_evb.c
>  
> +SPEAR PLGPIO SUPPORT
> +M:	Viresh Kumar <viresh.kumar@...com>
> +W:	http://www.st.com/spear
> +S:	Maintained
> +F:	drivers/gpio/spear-plgpio.c
> +F:	include/linux/spear-plgpio.h
> +
>  SPECIALIX IO8+ MULTIPORT SERIAL CARD DRIVER
>  S:	Orphan
>  F:	Documentation/serial/specialix.txt
> diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
> index 4a7f631..227d2e7 100644
> --- a/drivers/gpio/Kconfig
> +++ b/drivers/gpio/Kconfig
> @@ -164,6 +164,13 @@ config GPIO_VX855
>  	  additional drivers must be enabled in order to use the
>  	  functionality of the device.
>  
> +config SPEAR_PLGPIO
> +	bool "ST Micro SPEAr PLGPIO"
> +	depends on PLAT_SPEAR
> +	help
> +	  This enables support for the PLGPIOs found on the ST Microelectronics
> +	  SPEAr platform
> +
>  comment "I2C GPIO expanders:"
>  
>  config GPIO_MAX7300
> diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
> index b605f8e..2d325b0 100644
> --- a/drivers/gpio/Makefile
> +++ b/drivers/gpio/Makefile
> @@ -48,3 +48,4 @@ obj-$(CONFIG_GPIO_VX855)	+= vx855_gpio.o
>  obj-$(CONFIG_GPIO_ML_IOH)	+= ml_ioh_gpio.o
>  obj-$(CONFIG_AB8500_GPIO)       += ab8500-gpio.o
>  obj-$(CONFIG_GPIO_TPS65910)	+= tps65910-gpio.o
> +obj-$(CONFIG_SPEAR_PLGPIO)	+= spear-plgpio.o
> diff --git a/drivers/gpio/spear-plgpio.c b/drivers/gpio/spear-plgpio.c
> new file mode 100644
> index 0000000..885c0da
> --- /dev/null
> +++ b/drivers/gpio/spear-plgpio.c
> @@ -0,0 +1,490 @@
> +/*
> + * drivers/gpio/spear-plgpio.c
> + *
> + * SPEAr platform PLGPIO driver source file
> + *
> + * Copyright (C) 2010-2011 ST Microelectronics
> + * Viresh Kumar<viresh.kumar@...com>
> + *
> + * This file is licensed under the terms of the GNU General Public
> + * License version 2. This program is licensed "as is" without any
> + * warranty of any kind, whether express or implied.
> + */
> +
> +#include <linux/bitops.h>
> +#include <linux/compiler.h>
> +#include <linux/errno.h>
> +#include <linux/gpio.h>
> +#include <linux/io.h>
> +#include <linux/ioport.h>
> +#include <linux/irq.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/slab.h>
> +#include <linux/spear-plgpio.h>
> +#include <linux/spinlock.h>
> +
> +#define MAX_GPIO_PER_REG		32
> +#define PIN_OFFSET(pin)			(pin % MAX_GPIO_PER_REG)
> +#define REG_OFFSET(base, reg, pin)	(base + reg + (pin / MAX_GPIO_PER_REG)\
> +		* sizeof(int *))
> +
> +/*
> + * struct plgpio: plgpio driver specific structure
> + *
> + * lock: lock for guarding gpio registers
> + * base: base address of plgpio block
> + * irq_base: irq number of plgpio0
> + * chip: gpio framework specific chip information structure
> + * p2o: function ptr for pin to offset conversion. This is required only for
> + * machines where mapping b/w pin and offset is not 1-to-1.
> + * o2p: function ptr for offset to pin conversion. This is required only for
> + * machines where mapping b/w pin and offset is not 1-to-1.
> + * p2o_regs: mask of registers for which p2o and o2p are applicable
> + * regs: register offsets
> + * irq_trigger_type: irq type supported
> + */
> +struct plgpio {
> +	spinlock_t		lock;
> +	void __iomem		*base;
> +	unsigned		irq_base;
> +	struct gpio_chip	chip;
> +	int			(*p2o)(int pin);	/* pin_to_offset */
> +	int			(*o2p)(int offset);	/* offset_to_pin */
> +	unsigned		p2o_regs;
> +	struct plgpio_regs	regs;
> +	unsigned		irq_trigger_type;
> +};
> +
> +/* register manipulation inline functions */
> +static inline u32 is_plgpio_set(void __iomem *base, u32 pin, u32 reg)
> +{
> +	u32 offset = PIN_OFFSET(pin);
> +	void __iomem *reg_off = REG_OFFSET(base, reg, pin);
> +	u32 val = readl(reg_off);
> +
> +	return val & (1 << offset);
> +}
> +
> +static inline void plgpio_reg_set(void __iomem *base, u32 pin, u32 reg)
> +{
> +	u32 offset = PIN_OFFSET(pin);
> +	void __iomem *reg_off = REG_OFFSET(base, reg, pin);
> +	u32 val = readl(reg_off);
> +
> +	writel(val | (1 << offset), reg_off);
> +}
> +
> +static inline void plgpio_reg_reset(void __iomem *base, u32 pin, u32 reg)
> +{
> +	u32 offset = PIN_OFFSET(pin);
> +	void __iomem *reg_off = REG_OFFSET(base, reg, pin);
> +	u32 val = readl(reg_off);
> +
> +	writel(val & ~(1 << offset), reg_off);
> +}
> +
> +/* gpio framework specific routines */
> +static int plgpio_direction_input(struct gpio_chip *chip, unsigned offset)
> +{
> +	struct plgpio *plgpio = container_of(chip, struct plgpio, chip);
> +	unsigned long flags;
> +
> +	if (offset >= chip->ngpio)
> +		return -EINVAL;
> +
> +	/* get correct offset for "offset" pin */
> +	if (plgpio->p2o && (plgpio->p2o_regs & PTO_DIR_REG)) {
> +		offset = plgpio->p2o(offset);
> +		if (offset == -1)
> +			return -EINVAL;
> +	}
> +
> +	spin_lock_irqsave(&plgpio->lock, flags);
> +	plgpio_reg_set(plgpio->base, offset, plgpio->regs.dir);
> +	spin_unlock_irqrestore(&plgpio->lock, flags);
> +
> +	return 0;
> +}
> +
> +static int plgpio_direction_output(struct gpio_chip *chip, unsigned offset,
> +		int value)
> +{
> +	struct plgpio *plgpio = container_of(chip, struct plgpio, chip);
> +	unsigned long flags;
> +	unsigned dir_offset = offset, wdata_offset = offset, tmp;
> +
> +	if (offset >= chip->ngpio)
> +		return -EINVAL;
> +
> +	/* get correct offset for "offset" pin */
> +	if (plgpio->p2o && (plgpio->p2o_regs & (PTO_DIR_REG | PTO_WDATA_REG))) {
> +		tmp = plgpio->p2o(offset);
> +		if (tmp == -1)
> +			return -EINVAL;
> +
> +		if (plgpio->p2o_regs & PTO_DIR_REG)
> +			dir_offset = tmp;
> +		if (plgpio->p2o_regs & PTO_WDATA_REG)
> +			wdata_offset = tmp;
> +	}
> +
> +	spin_lock_irqsave(&plgpio->lock, flags);
> +	plgpio_reg_reset(plgpio->base, dir_offset, plgpio->regs.dir);
> +	if (value)
> +		plgpio_reg_set(plgpio->base, wdata_offset,
> +				plgpio->regs.wdata);
> +	else
> +		plgpio_reg_reset(plgpio->base, wdata_offset,
> +				plgpio->regs.wdata);
> +	spin_unlock_irqrestore(&plgpio->lock, flags);
> +
> +	return 0;
> +}
> +
> +static int plgpio_get_value(struct gpio_chip *chip, unsigned offset)
> +{
> +	struct plgpio *plgpio = container_of(chip, struct plgpio, chip);
> +
> +	if (offset >= chip->ngpio)
> +		return -EINVAL;
> +
> +	/* get correct offset for "offset" pin */
> +	if (plgpio->p2o && (plgpio->p2o_regs & PTO_RDATA_REG)) {
> +		offset = plgpio->p2o(offset);
> +		if (offset == -1)
> +			return -EINVAL;
> +	}
> +
> +	return is_plgpio_set(plgpio->base, offset, plgpio->regs.rdata);
> +}
> +
> +static void plgpio_set_value(struct gpio_chip *chip, unsigned offset, int value)
> +{
> +	struct plgpio *plgpio = container_of(chip, struct plgpio, chip);
> +
> +	if (offset >= chip->ngpio)
> +		return;
> +
> +	/* get correct offset for "offset" pin */
> +	if (plgpio->p2o && (plgpio->p2o_regs & PTO_WDATA_REG)) {
> +		offset = plgpio->p2o(offset);
> +		if (offset == -1)
> +			return;
> +	}
> +
> +	if (value)
> +		plgpio_reg_set(plgpio->base, offset, plgpio->regs.wdata);
> +	else
> +		plgpio_reg_reset(plgpio->base, offset, plgpio->regs.wdata);
> +}
> +
> +static int plgpio_request(struct gpio_chip *chip, unsigned offset)
> +{
> +	struct plgpio *plgpio = container_of(chip, struct plgpio, chip);
> +	unsigned long flags;
> +	int ret = 0;
> +
> +	if (offset >= chip->ngpio)
> +		return -EINVAL;
> +
> +	/*
> +	 * put gpio in IN mode before enabling it. This make enabling gpio safe
> +	 */
> +	ret = plgpio_direction_input(chip, offset);
> +	if (ret)
> +		return ret;
> +
> +	/* get correct offset for "offset" pin */
> +	if (plgpio->p2o && (plgpio->p2o_regs & PTO_ENB_REG)) {
> +		offset = plgpio->p2o(offset);
> +		if (offset == -1)
> +			return -EINVAL;
> +	}
> +
> +	spin_lock_irqsave(&plgpio->lock, flags);
> +	plgpio_reg_set(plgpio->base, offset, plgpio->regs.enb);
> +	spin_unlock_irqrestore(&plgpio->lock, flags);
> +
> +	return 0;
> +}
> +
> +static void plgpio_free(struct gpio_chip *chip, unsigned offset)
> +{
> +	struct plgpio *plgpio = container_of(chip, struct plgpio, chip);
> +	unsigned long flags;
> +
> +	if (offset >= chip->ngpio)
> +		return;
> +
> +	/* get correct offset for "offset" pin */
> +	if (plgpio->p2o && (plgpio->p2o_regs & PTO_ENB_REG)) {
> +		offset = plgpio->p2o(offset);
> +		if (offset == -1)
> +			return;
> +	}
> +
> +	spin_lock_irqsave(&plgpio->lock, flags);
> +	plgpio_reg_reset(plgpio->base, offset, plgpio->regs.enb);
> +	spin_unlock_irqrestore(&plgpio->lock, flags);
> +}
> +
> +static int plgpio_to_irq(struct gpio_chip *chip, unsigned offset)
> +{
> +	struct plgpio *plgpio = container_of(chip, struct plgpio, chip);
> +
> +	if (plgpio->irq_base == (unsigned) -1)
> +		return -EINVAL;
> +
> +	return plgpio->irq_base + offset;
> +}
> +
> +/* PLGPIO IRQ */
> +static void plgpio_irq_mask(struct irq_data *d)
> +{
> +	struct plgpio *plgpio = irq_data_get_irq_chip_data(d);
> +	int offset = d->irq - plgpio->irq_base;
> +	unsigned long flags;
> +
> +	/* get correct offset for "offset" pin */
> +	if (plgpio->p2o && (plgpio->p2o_regs & PTO_IE_REG)) {
> +		offset = plgpio->p2o(offset);
> +		if (offset == -1)
> +			return;
> +	}
> +
> +	spin_lock_irqsave(&plgpio->lock, flags);
> +	plgpio_reg_set(plgpio->base, offset, plgpio->regs.ie);
> +	spin_unlock_irqrestore(&plgpio->lock, flags);
> +}
> +
> +static void plgpio_irq_unmask(struct irq_data *d)
> +{
> +	struct plgpio *plgpio = irq_data_get_irq_chip_data(d);
> +	int offset = d->irq - plgpio->irq_base;
> +	unsigned long flags;
> +
> +	/* get correct offset for "offset" pin */
> +	if (plgpio->p2o && (plgpio->p2o_regs & PTO_IE_REG)) {
> +		offset = plgpio->p2o(offset);
> +		if (offset == -1)
> +			return;
> +	}
> +
> +	spin_lock_irqsave(&plgpio->lock, flags);
> +	plgpio_reg_reset(plgpio->base, offset, plgpio->regs.ie);
> +	spin_unlock_irqrestore(&plgpio->lock, flags);
> +}
> +
> +static int plgpio_irq_type(struct irq_data *d, unsigned trigger)
> +{
> +	struct plgpio *plgpio = irq_data_get_irq_chip_data(d);
> +	int offset = d->irq - plgpio->irq_base;
> +
> +	if (!(plgpio->irq_trigger_type & trigger))
> +		return -EINVAL;
> +	if (offset >= plgpio->chip.ngpio)
> +		return -EINVAL;
> +
> +	/*
> +	 * Currently we only need to configure register in case of edge
> +	 * interrupt
> +	 */
> +	if (plgpio->irq_trigger_type == (IRQ_TYPE_EDGE_RISING |
> +				IRQ_TYPE_EDGE_FALLING)) {
> +		void __iomem *reg_off = REG_OFFSET(plgpio->base,
> +				plgpio->regs.eit, offset);
> +		u32 val = readl(reg_off);
> +
> +		offset = PIN_OFFSET(offset);
> +		if (trigger == IRQ_TYPE_EDGE_RISING)
> +			writel(val | (1 << offset), reg_off);
> +		else
> +			writel(val & ~(1 << offset), reg_off);
> +	}
> +
> +	return 0;
> +}
> +
> +static struct irq_chip plgpio_irqchip = {
> +	.name		= "PLGPIO",
> +	.irq_mask	= plgpio_irq_mask,
> +	.irq_unmask	= plgpio_irq_unmask,
> +	.irq_set_type	= plgpio_irq_type,
> +};
> +
> +static void plgpio_irq_handler(unsigned irq, struct irq_desc *desc)
> +{
> +	struct plgpio *plgpio = irq_get_handler_data(irq);
> +	int regs_count = DIV_ROUND_UP(plgpio->chip.ngpio, MAX_GPIO_PER_REG),
> +	    count, pin, offset, i = 0;
> +	unsigned long pending;
> +
> +	desc->irq_data.chip->irq_ack(&desc->irq_data);
> +	/* check all plgpio MIS registers for a possible interrupt */
> +	for (; i < regs_count; i++) {
> +		pending = readl(plgpio->base + plgpio->regs.mis +
> +				i * sizeof(int *));
> +		if (!pending)
> +			continue;
> +
> +		/* clear interrupts */
> +		writel(~pending, plgpio->base + plgpio->regs.mis +
> +				i * sizeof(int *));
> +		/*
> +		 * clear extra bits in last register having gpios < MAX/REG
> +		 * ex: Suppose there are max 102 plgpios. then last register
> +		 * must have only (102 - MAX_GPIO_PER_REG * 3) = 6 relevant bits
> +		 * so, we must not take other 28 bits into consideration for
> +		 * checking interrupt. so clear those bits.
> +		 */
> +		count = plgpio->chip.ngpio - i * MAX_GPIO_PER_REG;
> +		if (count < MAX_GPIO_PER_REG)
> +			pending &= (1 << count) - 1;
> +
> +		for_each_set_bit(offset, &pending, MAX_GPIO_PER_REG) {
> +			/* get correct pin for "offset" */
> +			if (plgpio->o2p && (plgpio->p2o_regs & PTO_MIS_REG)) {
> +				pin = plgpio->o2p(offset);
> +				if (pin == -1)
> +					continue;
> +			} else
> +				pin = offset;
> +
> +			generic_handle_irq(plgpio_to_irq(&plgpio->chip,
> +						i * MAX_GPIO_PER_REG + pin));
> +		}
> +	}
> +	desc->irq_data.chip->irq_unmask(&desc->irq_data);
> +}
> +
> +static int __devinit plgpio_probe(struct platform_device *pdev)
> +{
> +	struct spear_plgpio_pdata *pdata;
> +	struct plgpio *plgpio;
> +	int ret, irq, i;
> +	struct resource *res;
> +
> +	pdata = pdev->dev.platform_data;
> +	if (!pdata) {
> +		ret = -ENODEV;
> +		dev_dbg(&pdev->dev, "invalid platform data\n");
> +		goto fail;
> +	}
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	if (!res) {
> +		ret = -EBUSY;
> +		dev_dbg(&pdev->dev, "invalid IORESOURCE_MEM\n");
> +		goto fail;
> +	}
> +
> +	if (!request_mem_region(res->start, resource_size(res), "plgpio")) {
> +		ret = -EBUSY;
> +		dev_dbg(&pdev->dev, "request mem region fail\n");
> +		goto fail;
> +	}
> +
> +	plgpio = kzalloc(sizeof(*plgpio), GFP_KERNEL);
> +	if (!plgpio) {
> +		ret = -ENOMEM;
> +		dev_dbg(&pdev->dev, "memory allocation fail\n");
> +		goto release_region;
> +	}
> +
> +	plgpio->base = ioremap(res->start, resource_size(res));
> +	if (!plgpio->base) {
> +		ret = -ENOMEM;
> +		dev_dbg(&pdev->dev, "ioremap fail\n");
> +		goto kfree;
> +	}
> +
> +	spin_lock_init(&plgpio->lock);
> +
> +	plgpio->chip.request = plgpio_request;
> +	plgpio->chip.free = plgpio_free;
> +	plgpio->chip.direction_input = plgpio_direction_input;
> +	plgpio->chip.direction_output = plgpio_direction_output;
> +	plgpio->chip.get = plgpio_get_value;
> +	plgpio->chip.set = plgpio_set_value;
> +	plgpio->chip.to_irq = plgpio_to_irq;
> +	plgpio->chip.base = pdata->gpio_base;
> +	plgpio->chip.ngpio = pdata->gpio_count;
> +	plgpio->chip.label = dev_name(&pdev->dev);
> +	plgpio->chip.dev = &pdev->dev;
> +	plgpio->chip.owner = THIS_MODULE;
> +	plgpio->irq_base = pdata->irq_base;
> +	plgpio->p2o = pdata->p2o;
> +	plgpio->o2p = pdata->o2p;
> +	plgpio->p2o_regs = pdata->p2o_regs;
> +	plgpio->regs.enb = pdata->regs.enb;
> +	plgpio->regs.wdata = pdata->regs.wdata;
> +	plgpio->regs.dir = pdata->regs.dir;
> +	plgpio->regs.ie = pdata->regs.ie;
> +	plgpio->regs.rdata = pdata->regs.rdata;
> +	plgpio->regs.mis = pdata->regs.mis;
> +	plgpio->irq_trigger_type = pdata->irq_trigger_type;
> +
> +	ret = gpiochip_add(&plgpio->chip);
> +	if (ret) {
> +		dev_dbg(&pdev->dev, "unable to add gpio chip\n");
> +		goto iounmap;
> +	}
> +
> +	/* irq_chip support */
> +	if (pdata->irq_base == (unsigned) -1) {
> +		dev_info(&pdev->dev, "Successfully registered without irqs\n");
> +		return 0;
> +	}
> +
> +	irq = platform_get_irq(pdev, 0);
> +	if (irq < 0) {
> +		ret = -ENODEV;
> +		dev_dbg(&pdev->dev, "invalid irq number\n");
> +		goto remove_gpiochip;
> +	}
> +
> +	irq_set_chained_handler(irq, plgpio_irq_handler);
> +	for (i = 0; i < pdata->gpio_count; i++) {
> +		irq_set_chip_and_handler(i+plgpio->irq_base, &plgpio_irqchip,
> +				handle_simple_irq);
> +		set_irq_flags(i+plgpio->irq_base, IRQF_VALID);
> +		irq_set_chip_data(i+plgpio->irq_base, plgpio);
> +	}
> +	irq_set_handler_data(irq, plgpio);
> +	dev_info(&pdev->dev, "Successfully registered with irqs\n");
> +
> +	return 0;
> +
> +remove_gpiochip:
> +	if (gpiochip_remove(&plgpio->chip))
> +		dev_dbg(&pdev->dev, "unable to remove gpiochip\n");
> +iounmap:
> +	iounmap(plgpio->base);
> +kfree:
> +	kfree(plgpio);
> +release_region:
> +	release_mem_region(res->start, resource_size(res));
> +fail:
> +	dev_err(&pdev->dev, "probe fail: %d\n", ret);
> +	return ret;
> +}
> +
> +static struct platform_driver plgpio_driver = {
> +	.probe		= plgpio_probe,
> +	.driver		= {
> +		.name	= "spear-plgpio",
> +		.owner	= THIS_MODULE,
> +	},
> +};
> +
> +static int __init plgpio_init(void)
> +{
> +	return platform_driver_register(&plgpio_driver);
> +}
> +subsys_initcall(plgpio_init);
> +
> +MODULE_AUTHOR("Viresh Kumar <viresh.kumar@...com>");
> +MODULE_DESCRIPTION("SPEAr PLGPIO driver");
> +MODULE_LICENSE("GPL");
> diff --git a/include/linux/spear-plgpio.h b/include/linux/spear-plgpio.h
> new file mode 100644
> index 0000000..a04986a
> --- /dev/null
> +++ b/include/linux/spear-plgpio.h
> @@ -0,0 +1,69 @@
> +/*
> + * include/linux/spear-plgpio.h
> + *
> + * SPEAr platform PLGPIO driver header file
> + *
> + * Copyright (C) 2010-2011 ST Microelectronics
> + * Viresh Kumar<viresh.kumar@...com>
> + *
> + * This file is licensed under the terms of the GNU General Public
> + * License version 2. This program is licensed "as is" without any
> + * warranty of any kind, whether express or implied.
> + */
> +
> +#ifndef __SPEAR_PLGPIO_H
> +#define __SPEAR_PLGPIO_H
> +
> +#include <linux/types.h>
> +
> +/* plgpio driver declarations */
> +/*
> + * plgpio pins in all machines are not one to one mapped, bitwise with
> + * registers bits. These set of macros define register masks for which below
> + * functions (pin_to_offset and offset_to_pin) are required to be called.
> + */
> +#define PTO_ENB_REG		0x001
> +#define PTO_WDATA_REG		0x002
> +#define PTO_DIR_REG		0x004
> +#define PTO_IE_REG		0x008
> +#define PTO_RDATA_REG		0x010
> +#define PTO_MIS_REG		0x020
> +
> +/* plgpio registers */
> +struct plgpio_regs {
> +	u32 enb;		/* enable register */
> +	u32 wdata;		/* write data register */
> +	u32 dir;		/* direction set register */
> +	u32 rdata;		/* read data register */
> +	u32 ie;			/* interrupt enable register */
> +	u32 mis;		/* mask interrupt status register */
> +	u32 eit;		/* edge interrupt type */
> +};
> +
> +/**
> + * struct spear_plgpio_pdata: plgpio driver platform data
> + *
> + * gpio_base: gpio start number of plgpios
> + * irq_base: irq number of plgpio0
> + * gpio_count: total count of plgpios
> + * p2o: function ptr for pin to offset conversion. This is required only for
> + * machines where mapping b/w pin and offset is not 1-to-1.
> + * o2p: function ptr for offset to pin conversion. This is required only for
> + * machines where mapping b/w pin and offset is not 1-to-1.
> + * p2o_regs: mask of registers for which p2o and o2p are applicable
> + * regs: register offsets
> + * irq_trigger_type: irq type supported
> + */
> +struct spear_plgpio_pdata {
> +	u32		gpio_base;
> +	u32		irq_base;
> +	u32		gpio_count;
> +	int		(*p2o)(int pin);	/* pin_to_offset */
> +	int		(*o2p)(int offset);	/* offset_to_pin */
> +	u32		p2o_regs;
> +	struct		plgpio_regs regs;
> +	unsigned	irq_trigger_type;
> +};
> +
> +#endif /* __SPEAR_PLGPIO_H */
> +
> -- 
> 1.7.2.2
> 
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