[U-Boot] [PATCH 1/2 v4] ARM : Add GPIO Driver and IOMUX definition for S3C2440

[Minkyu Kang]

Dear Gabriel Huau,

On 30 April 2012 23:11, Gabriel Huau <contact at huau-gabriel.fr> wrote:
> It's now possible to use the gpio driver interface
> for s3c2440. This patch add iomux definitions too.
>
> Signed-off-by: Gabriel Huau <contact at huau-gabriel.fr>
> ---
> Changes for v2:
>        - Modification of the coding style
>        - Add my email address to copyright
>        - Remove a typedef
>        - Move some defines to driver file
>
> Changes for v3:
>        - Cleanup coding style
>        - Changement of the commit message
>
> Changes for v4:
>        - Add a nice commit message
>
>  arch/arm/include/asm/arch-s3c24x0/gpio.h  |  171 ++++++++++++++++++++++++
>  arch/arm/include/asm/arch-s3c24x0/iomux.h |  200 +++++++++++++++++++++++++++++
>  drivers/gpio/Makefile                     |    1 +
>  drivers/gpio/s3c2440_gpio.c               |   94 ++++++++++++++
>  4 files changed, 466 insertions(+)
>  create mode 100644 arch/arm/include/asm/arch-s3c24x0/gpio.h
>  create mode 100644 arch/arm/include/asm/arch-s3c24x0/iomux.h
>  create mode 100644 drivers/gpio/s3c2440_gpio.c
>
> diff --git a/drivers/gpio/s3c2440_gpio.c b/drivers/gpio/s3c2440_gpio.c
> new file mode 100644
> index 0000000..12a9043
> --- /dev/null
> +++ b/drivers/gpio/s3c2440_gpio.c
> @@ -0,0 +1,94 @@
> +/*
> + * Copyright (C) 2012
> + * Gabriel Huau <contact at huau-gabriel.fr>
> + *
> + * See file CREDITS for list of people who contributed to this
> + * project.
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation; either version 2 of
> + * the License, or (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
> + * MA 02111-1307 USA
> + */
> +#include <common.h>
> +#include <asm/arch/s3c2440.h>
> +#include <asm/gpio.h>
> +#include <asm/io.h>
> +
> +#define GPIO_INPUT  0x0
> +#define GPIO_OUTPUT 0x1
> +
> +/* 0x4 means that we want DAT and not CON register */
> +#define GPIO_PORT(x)   ((((x) >> 5) & 0x3) + 0x4)
> +#define GPIO_BIT(x)            ((x) & 0x3f)
> +
> +/*
> + * It's how we calculate the full port address
> + * We have to get the number of the port + 1 (Port A is at 0x56000001 ...)
> + * We move it at the second digit, and finally we add 0x4 because we want
> + * to modify GPIO DAT and not CON
> + */
> +#define GPIO_FULLPORT(x) (S3C24X0_GPIO_BASE | ((GPIO_PORT(gpio) + 1) << 1))
> +
> +int gpio_set_value(unsigned gpio, int value)
> +{
> +       unsigned l = readl(GPIO_FULLPORT(gpio));
> +       unsigned port = GPIO_FULLPORT(gpio);
> +
> +       /*
> +        * All GPIO Port have a configuration on
> +        * 2 bits excepted the first GPIO (A) which
> +        * have only 1 bit of configuration.
> +        */
> +       if (value)
> +               if (!GPIO_PORT(gpio))
> +                       l |= (0x1 << GPIO_BIT(gpio));
> +               else
> +                       l |= (0x3 << GPIO_BIT(gpio));
> +       else
> +               if (!GPIO_PORT(gpio))
> +                       l &= ~(0x1 << GPIO_BIT(gpio));
> +               else
> +                       l &= ~(0x3 << GPIO_BIT(gpio));

Need brace at this if..else statement.

> +       return writel(port, l);
> +}
> +
> +int gpio_get_value(unsigned gpio)
> +{
> +       unsigned l = readl(GPIO_FULLPORT(gpio));
> +
> +       if (GPIO_PORT(gpio) == 0) /* PORT A */
> +               return (l >> GPIO_BIT(gpio)) & 0x1;
> +       return (l >> GPIO_BIT(gpio)) & 0x3;
> +}
> +
> +int gpio_request(unsigned gpio, const char *label)
> +{
> +       return 0;
> +}
> +
> +int gpio_free(unsigned gpio)
> +{
> +       return 0;
> +}
> +
> +int gpio_direction_input(unsigned gpio)
> +{
> +       return writel(GPIO_FULLPORT(gpio), GPIO_INPUT << GPIO_BIT(gpio));
> +}
> +
> +int gpio_direction_output(unsigned gpio, int value)
> +{
> +       writel(GPIO_FULLPORT(gpio), GPIO_OUTPUT << GPIO_BIT(gpio));
> +       return gpio_set_value(gpio, value);
> +}
> --
> 1.7.9.5
>
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Thanks.
Minkyu Kang.
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