[v1,2/5] gpio: timberdale: convert to use basic mmio gpio library

From: Kamlakant Patel <kamlakant.patel@linaro.org>

This patch converts TIMBERDALE GPIO driver to use basic_mmio_gpio
generic library.

Signed-off-by: Kamlakant Patel <kamlakant.patel@linaro.org>
---
 drivers/gpio/Kconfig           |  1 +
 drivers/gpio/gpio-timberdale.c | 96 ++++++++++++------------------------------
 2 files changed, 28 insertions(+), 69 deletions(-)

Richard can you look at this patch and even test it maybe?

Do you still work with the Timberdale hardware or do you
know anyone who does?

Yours,
Linus Walleij

On Mon, Dec 1, 2014 at 1:09 PM,  <kamlakant.patel@linaro.org> wrote:
> From: Kamlakant Patel <kamlakant.patel@linaro.org>
>
> This patch converts TIMBERDALE GPIO driver to use basic_mmio_gpio
> generic library.
>
> Signed-off-by: Kamlakant Patel <kamlakant.patel@linaro.org>
> ---
>  drivers/gpio/Kconfig           |  1 +
>  drivers/gpio/gpio-timberdale.c | 96 ++++++++++++------------------------------
>  2 files changed, 28 insertions(+), 69 deletions(-)
>
> diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
> index 3bd4d63..875d312 100644
> --- a/drivers/gpio/Kconfig
> +++ b/drivers/gpio/Kconfig
> @@ -783,6 +783,7 @@ config GPIO_SODAVILLE
>  config GPIO_TIMBERDALE
>         bool "Support for timberdale GPIO IP"
>         depends on MFD_TIMBERDALE
> +       select GPIO_GENERIC
>         ---help---
>         Add support for the GPIO IP in the timberdale FPGA.
>
> diff --git a/drivers/gpio/gpio-timberdale.c b/drivers/gpio/gpio-timberdale.c
> index a685a3c..8849851 100644
> --- a/drivers/gpio/gpio-timberdale.c
> +++ b/drivers/gpio/gpio-timberdale.c
> @@ -28,6 +28,7 @@
>  #include <linux/timb_gpio.h>
>  #include <linux/interrupt.h>
>  #include <linux/slab.h>
> +#include <linux/basic_mmio_gpio.h>
>
>  #define DRIVER_NAME "timb-gpio"
>
> @@ -45,60 +46,15 @@
>  struct timbgpio {
>         void __iomem            *membase;
>         spinlock_t              lock; /* mutual exclusion */
> -       struct gpio_chip        gpio;
> +       struct bgpio_chip       bgc;
>         int                     irq_base;
>         unsigned long           last_ier;
>  };
>
> -static int timbgpio_update_bit(struct gpio_chip *gpio, unsigned index,
> -       unsigned offset, bool enabled)
> -{
> -       struct timbgpio *tgpio = container_of(gpio, struct timbgpio, gpio);
> -       u32 reg;
> -
> -       spin_lock(&tgpio->lock);
> -       reg = ioread32(tgpio->membase + offset);
> -
> -       if (enabled)
> -               reg |= (1 << index);
> -       else
> -               reg &= ~(1 << index);
> -
> -       iowrite32(reg, tgpio->membase + offset);
> -       spin_unlock(&tgpio->lock);
> -
> -       return 0;
> -}
> -
> -static int timbgpio_gpio_direction_input(struct gpio_chip *gpio, unsigned nr)
> -{
> -       return timbgpio_update_bit(gpio, nr, TGPIODIR, true);
> -}
> -
> -static int timbgpio_gpio_get(struct gpio_chip *gpio, unsigned nr)
> -{
> -       struct timbgpio *tgpio = container_of(gpio, struct timbgpio, gpio);
> -       u32 value;
> -
> -       value = ioread32(tgpio->membase + TGPIOVAL);
> -       return (value & (1 << nr)) ? 1 : 0;
> -}
> -
> -static int timbgpio_gpio_direction_output(struct gpio_chip *gpio,
> -                                               unsigned nr, int val)
> -{
> -       return timbgpio_update_bit(gpio, nr, TGPIODIR, false);
> -}
> -
> -static void timbgpio_gpio_set(struct gpio_chip *gpio,
> -                               unsigned nr, int val)
> -{
> -       timbgpio_update_bit(gpio, nr, TGPIOVAL, val != 0);
> -}
> -
>  static int timbgpio_to_irq(struct gpio_chip *gpio, unsigned offset)
>  {
> -       struct timbgpio *tgpio = container_of(gpio, struct timbgpio, gpio);
> +       struct bgpio_chip *bgc = container_of(gpio, struct bgpio_chip, gc);
> +       struct timbgpio *tgpio = container_of(bgc, struct timbgpio, bgc);
>
>         if (tgpio->irq_base <= 0)
>                 return -EINVAL;
> @@ -142,7 +98,7 @@ static int timbgpio_irq_type(struct irq_data *d, unsigned trigger)
>         u32 ver;
>         int ret = 0;
>
> -       if (offset < 0 || offset > tgpio->gpio.ngpio)
> +       if (offset < 0 || offset > tgpio->bgc.gc.ngpio)
>                 return -EINVAL;
>
>         ver = ioread32(tgpio->membase + TGPIO_VER);
> @@ -208,8 +164,8 @@ static void timbgpio_irq(unsigned int irq, struct irq_desc *desc)
>          */
>         iowrite32(0, tgpio->membase + TGPIO_IER);
>
> -       for_each_set_bit(offset, &ipr, tgpio->gpio.ngpio)
> -               generic_handle_irq(timbgpio_to_irq(&tgpio->gpio, offset));
> +       for_each_set_bit(offset, &ipr, tgpio->bgc.gc.ngpio)
> +               generic_handle_irq(timbgpio_to_irq(&tgpio->bgc.gc, offset));
>
>         iowrite32(tgpio->last_ier, tgpio->membase + TGPIO_IER);
>  }
> @@ -225,7 +181,6 @@ static int timbgpio_probe(struct platform_device *pdev)
>  {
>         int err, i;
>         struct device *dev = &pdev->dev;
> -       struct gpio_chip *gc;
>         struct timbgpio *tgpio;
>         struct resource *iomem;
>         struct timbgpio_platform_data *pdata = dev_get_platdata(&pdev->dev);
> @@ -247,6 +202,7 @@ static int timbgpio_probe(struct platform_device *pdev)
>                 dev_err(dev, "Memory alloc failed\n");
>                 return -EINVAL;
>         }
> +
>         tgpio->irq_base = pdata->irq_base;
>
>         spin_lock_init(&tgpio->lock);
> @@ -263,22 +219,24 @@ static int timbgpio_probe(struct platform_device *pdev)
>                 return -ENOMEM;
>         }
>
> -       gc = &tgpio->gpio;
> -
> -       gc->label = dev_name(&pdev->dev);
> -       gc->owner = THIS_MODULE;
> -       gc->dev = &pdev->dev;
> -       gc->direction_input = timbgpio_gpio_direction_input;
> -       gc->get = timbgpio_gpio_get;
> -       gc->direction_output = timbgpio_gpio_direction_output;
> -       gc->set = timbgpio_gpio_set;
> -       gc->to_irq = (irq >= 0 && tgpio->irq_base > 0) ? timbgpio_to_irq : NULL;
> -       gc->dbg_show = NULL;
> -       gc->base = pdata->gpio_base;
> -       gc->ngpio = pdata->nr_pins;
> -       gc->can_sleep = false;
> -
> -       err = gpiochip_add(gc);
> +       err = bgpio_init(&tgpio->bgc, dev, 4, tgpio->membase + TGPIOVAL,
> +                        NULL, NULL, NULL, tgpio->membase + TGPIODIR, 0);
> +
> +       if (err) {
> +               dev_err(&pdev->dev, "bgpio_init failed\n");
> +               return err;
> +       }
> +       tgpio->bgc.gc.label = dev_name(&pdev->dev);
> +       tgpio->bgc.gc.owner = THIS_MODULE;
> +       tgpio->bgc.gc.dev = &pdev->dev;
> +       tgpio->bgc.gc.to_irq = (irq >= 0 && tgpio->irq_base > 0) ?
> +                                               timbgpio_to_irq : NULL;
> +       tgpio->bgc.gc.dbg_show = NULL;
> +       tgpio->bgc.gc.base = pdata->gpio_base;
> +       tgpio->bgc.gc.ngpio = pdata->nr_pins;
> +       tgpio->bgc.gc.can_sleep = false;
> +
> +       err = gpiochip_add(&tgpio->bgc.gc);
>         if (err)
>                 return err;
>
> @@ -322,7 +280,7 @@ static int timbgpio_remove(struct platform_device *pdev)
>                 irq_set_handler_data(irq, NULL);
>         }
>
> -       gpiochip_remove(&tgpio->gpio);
> +       gpiochip_remove(&tgpio->bgc.gc);
>
>         return 0;
>  }
> --
> 1.9.1
>
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