From: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
To: Carlo Caione <carlo.caione@gmail.com>
Cc: barebox@lists.infradead.org
Subject: Re: [PATCH 2/5] BCM2835: add gpio driver
Date: Fri, 12 Oct 2012 11:30:17 +0200 [thread overview]
Message-ID: <20121012093017.GH13639@game.jcrosoft.org> (raw)
In-Reply-To: <1349992331-22987-3-git-send-email-carlo.caione@gmail.com>
On 23:52 Thu 11 Oct , Carlo Caione wrote:
> Signed-off-by: Carlo Caione <carlo.caione@gmail.com>
> ---
> drivers/gpio/Kconfig | 4 ++
> drivers/gpio/Makefile | 1 +
> drivers/gpio/gpio-bcm2835.c | 166 ++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 171 insertions(+)
> create mode 100644 drivers/gpio/gpio-bcm2835.c
>
> diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
> index a0e9b58..e8eeb6d 100644
> --- a/drivers/gpio/Kconfig
> +++ b/drivers/gpio/Kconfig
> @@ -6,6 +6,10 @@ if GPIOLIB
>
> menu "GPIO "
>
> +config GPIO_BCM2835
> + bool "GPIO support for BCM2835"
> + depends on ARCH_BCM2835
> +
> config GPIO_PL061
> bool "PrimeCell PL061 GPIO support"
> depends on ARM_AMBA
> diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
> index e2e97d3..aecdf24 100644
> --- a/drivers/gpio/Makefile
> +++ b/drivers/gpio/Makefile
> @@ -1,4 +1,5 @@
> obj-$(CONFIG_GPIOLIB) += gpio.o
>
> +obj-$(CONFIG_GPIO_BCM2835) += gpio-bcm2835.o
> obj-$(CONFIG_GPIO_PL061) += gpio-pl061.o
> obj-$(CONFIG_GPIO_STMPE) += gpio-stmpe.o
> diff --git a/drivers/gpio/gpio-bcm2835.c b/drivers/gpio/gpio-bcm2835.c
> new file mode 100644
> index 0000000..e31894c
> --- /dev/null
> +++ b/drivers/gpio/gpio-bcm2835.c
> @@ -0,0 +1,166 @@
> +/*
> + * Author: Carlo Caione <carlo@carlocaione.org>
> + *
> + * Based on linux/arch/arm/mach-bcm2708/bcm2708_gpio.c
> + *
> + * 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 <errno.h>
> +#include <malloc.h>
> +#include <io.h>
> +#include <gpio.h>
> +#include <init.h>
> +#include <mach/platform.h>
> +
> +#define GPIOFSEL(x) (0x00+(x)*4)
> +#define GPIOSET(x) (0x1c+(x)*4)
> +#define GPIOCLR(x) (0x28+(x)*4)
> +#define GPIOLEV(x) (0x34+(x)*4)
> +#define GPIOEDS(x) (0x40+(x)*4)
> +#define GPIOREN(x) (0x4c+(x)*4)
> +#define GPIOFEN(x) (0x58+(x)*4)
> +#define GPIOHEN(x) (0x64+(x)*4)
> +#define GPIOLEN(x) (0x70+(x)*4)
> +#define GPIOAREN(x) (0x7c+(x)*4)
> +#define GPIOAFEN(x) (0x88+(x)*4)
> +#define GPIOUD(x) (0x94+(x)*4)
> +#define GPIOUDCLK(x) (0x98+(x)*4)
> +
> +enum {
> + GPIO_FSEL_INPUT, GPIO_FSEL_OUTPUT,
> + GPIO_FSEL_ALT5, GPIO_FSEL_ALT_4,
> + GPIO_FSEL_ALT0, GPIO_FSEL_ALT1,
> + GPIO_FSEL_ALT2, GPIO_FSEL_ALT3,
> +};
> +
> +struct bcm2835_gpio_chip {
> + void __iomem *base;
> + struct gpio_chip chip;
> +};
> +
> +static int bcm2835_set_function(struct gpio_chip *chip, unsigned gpio, int function)
> +{
> + struct bcm2835_gpio_chip *bcmgpio = container_of(chip, struct bcm2835_gpio_chip, chip);
> + void __iomem *base = bcmgpio->base;
> + unsigned gpiodir;
> + unsigned gpio_bank = gpio / 10;
> + unsigned gpio_field_offset = (gpio - 10 * gpio_bank) * 3;
> +
> + gpiodir = readl(base + GPIOFSEL(gpio_bank));
> + gpiodir &= ~(7 << gpio_field_offset);
> + gpiodir |= function << gpio_field_offset;
> + writel(gpiodir, base + GPIOFSEL(gpio_bank));
> + gpiodir = readl(base + GPIOFSEL(gpio_bank));
> +
> + return 0;
> +}
> +
> +static void bcm2835_gpio_set_value(struct gpio_chip *chip, unsigned gpio, int value)
> +{
> + struct bcm2835_gpio_chip *bcmgpio = container_of(chip, struct bcm2835_gpio_chip, chip);
> + void __iomem *base = bcmgpio->base;
> + unsigned gpio_bank = gpio / 32;
> + unsigned gpio_field_offset = gpio % 32;
> +
> + if (value)
> + writel(1 << gpio_field_offset, base + GPIOSET(gpio_bank));
> + else
> + writel(1 << gpio_field_offset, base + GPIOCLR(gpio_bank));
> +}
> +
> +static int bcm2835_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
> +{
> + struct bcm2835_gpio_chip *bcmgpio = container_of(chip, struct bcm2835_gpio_chip, chip);
> + void __iomem *base = bcmgpio->base;
> + unsigned gpio_bank = gpio / 32;
> + unsigned gpio_field_offset = gpio % 32;
> + unsigned lev;
> +
> + lev = readl(base + GPIOLEV(gpio_bank));
> + return 0x1 & (lev >> gpio_field_offset);
> +}
> +
> +static int bcm2835_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
> +{
> + return bcm2835_set_function(chip, gpio, GPIO_FSEL_INPUT);
> +}
> +
> +static int bcm2835_gpio_direction_output(struct gpio_chip *chip, unsigned gpio, int value)
> +{
> + int ret;
missing empty line
> + ret = bcm2835_set_function(chip, gpio, GPIO_FSEL_OUTPUT);
always return 0
> + if (ret >= 0)
> + bcm2835_gpio_set_value(chip, gpio, value);
> + return ret;
> +}
> +
Best Regards,
J.
_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox
next prev parent reply other threads:[~2012-10-12 9:32 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-11 21:52 [PATCH 0/5] BCM2835/RPi support Carlo Caione
2012-10-11 21:52 ` [PATCH 1/5] BCM2835: clocksource driver Carlo Caione
2012-10-12 9:26 ` Jean-Christophe PLAGNIOL-VILLARD
2012-10-11 21:52 ` [PATCH 2/5] BCM2835: add gpio driver Carlo Caione
2012-10-12 9:30 ` Jean-Christophe PLAGNIOL-VILLARD [this message]
2012-10-11 21:52 ` [PATCH 3/5] ARM1176: add support Carlo Caione
2012-10-11 21:52 ` [PATCH 4/5] BCM2835: " Carlo Caione
2012-10-12 9:33 ` Jean-Christophe PLAGNIOL-VILLARD
2012-10-11 21:52 ` [PATCH 5/5] Raspberry-Pi: " Carlo Caione
2012-10-12 9:35 ` Jean-Christophe PLAGNIOL-VILLARD
2012-10-13 11:22 [PATCH 0/5] BCM2835/Raspberry-Pi Carlo Caione
2012-10-13 11:22 ` [PATCH 2/5] BCM2835: add gpio driver Carlo Caione
2012-10-13 14:00 [PATCH 0/5] BCM2835/Raspberry-Pi support Carlo Caione
2012-10-13 14:00 ` [PATCH 2/5] BCM2835: add gpio driver Carlo Caione
2012-10-16 18:04 [PATCH 0/5] BCM2835/Raspberry-Pi support Carlo Caione
2012-10-16 18:04 ` [PATCH 2/5] BCM2835: add gpio driver Carlo Caione
2012-10-16 21:09 ` Sascha Hauer
2012-10-18 19:42 [PATCH 0/5] BCM2835/Raspberry-Pi support Carlo Caione
2012-10-18 19:42 ` [PATCH 2/5] BCM2835: add gpio driver Carlo Caione
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20121012093017.GH13639@game.jcrosoft.org \
--to=plagnioj@jcrosoft.com \
--cc=barebox@lists.infradead.org \
--cc=carlo.caione@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox