Dear Minkyu Kang,
Dear Gabriel Huau,
On 30 April 2012 23:11, Gabriel Huau contact@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@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@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));elsel |= (0x3 << GPIO_BIT(gpio));elseif (!GPIO_PORT(gpio))l &= ~(0x1 << GPIO_BIT(gpio));elsel &= ~(0x3 << GPIO_BIT(gpio));Need brace at this if..else statement.
I wanted to ask why, but ... C isn't python, good point ;-)
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.