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Kirkwood: add Marvell Kirkwood gpio driver

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Signed-off-by: Dieter Kiermaier <dk-arm-linux@gmx.de>
Acked-by: Prafulla Wadaskar <prafulla@marvell.com>
Tested-by: Heiko Schocher <hs@denx.de>
master
Dieter Kiermaier 16 years ago committed by Jean-Christophe PLAGNIOL-VILLARD
parent 688b6a0ff2
commit ec16441085
3 changed files with 203 additions and 0 deletions
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  1. 1
      drivers/gpio/Makefile
  2. 151
      drivers/gpio/kw_gpio.c
  3. 51
      include/asm-arm/arch-kirkwood/gpio.h

1
drivers/gpio/Makefile
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@ -25,6 +25,7 @@ include $(TOPDIR)/config.mk
LIB := $(obj)libgpio.a
COBJS-$(CONFIG_KIRKWOOD_GPIO) += kw_gpio.o
COBJS-$(CONFIG_MX31_GPIO) += mx31_gpio.o
COBJS-$(CONFIG_PCA953X) += pca953x.o

151
drivers/gpio/kw_gpio.c
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@ -0,0 +1,151 @@
/*
* arch/arm/plat-orion/gpio.c
*
* Marvell Orion SoC GPIO handling.
*
* 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.
*/
/*
* Based on (mostly copied from) plat-orion based Linux 2.6 kernel driver.
* Removed orion_gpiochip struct and kernel level irq handling.
*
* Dieter Kiermaier dk-arm-linux@gmx.de
*/
#include <common.h>
#include <asm/bitops.h>
#include <asm/arch/kirkwood.h>
#include <asm/arch/gpio.h>
static unsigned long gpio_valid_input[BITS_TO_LONGS(GPIO_MAX)];
static unsigned long gpio_valid_output[BITS_TO_LONGS(GPIO_MAX)];
void __set_direction(unsigned pin, int input)
{
u32 u;
u = readl(GPIO_IO_CONF(pin));
if (input)
u |= 1 << (pin & 31);
else
u &= ~(1 << (pin & 31));
writel(u, GPIO_IO_CONF(pin));
u = readl(GPIO_IO_CONF(pin));
}
void __set_level(unsigned pin, int high)
{
u32 u;
u = readl(GPIO_OUT(pin));
if (high)
u |= 1 << (pin & 31);
else
u &= ~(1 << (pin & 31));
writel(u, GPIO_OUT(pin));
}
void __set_blinking(unsigned pin, int blink)
{
u32 u;
u = readl(GPIO_BLINK_EN(pin));
if (blink)
u |= 1 << (pin & 31);
else
u &= ~(1 << (pin & 31));
writel(u, GPIO_BLINK_EN(pin));
}
int kw_gpio_is_valid(unsigned pin, int mode)
{
if (pin < GPIO_MAX) {
if ((mode & GPIO_INPUT_OK) && !test_bit(pin, gpio_valid_input))
goto err_out;
if ((mode & GPIO_OUTPUT_OK) && !test_bit(pin, gpio_valid_output))
goto err_out;
return 0;
}
err_out:
printf("%s: invalid GPIO %d\n", __func__, pin);
return 1;
}
void kw_gpio_set_valid(unsigned pin, int mode)
{
if (mode == 1)
mode = GPIO_INPUT_OK | GPIO_OUTPUT_OK;
if (mode & GPIO_INPUT_OK)
__set_bit(pin, gpio_valid_input);
else
__clear_bit(pin, gpio_valid_input);
if (mode & GPIO_OUTPUT_OK)
__set_bit(pin, gpio_valid_output);
else
__clear_bit(pin, gpio_valid_output);
}
/*
* GENERIC_GPIO primitives.
*/
int kw_gpio_direction_input(unsigned pin)
{
if (!kw_gpio_is_valid(pin, GPIO_INPUT_OK))
return 1;
/* Configure GPIO direction. */
__set_direction(pin, 1);
return 0;
}
int kw_gpio_direction_output(unsigned pin, int value)
{
if (kw_gpio_is_valid(pin, GPIO_OUTPUT_OK) != 0)
{
printf("%s: invalid GPIO %d\n", __func__, pin);
return 1;
}
__set_blinking(pin, 0);
/* Configure GPIO output value. */
__set_level(pin, value);
/* Configure GPIO direction. */
__set_direction(pin, 0);
return 0;
}
int kw_gpio_get_value(unsigned pin)
{
int val;
if (readl(GPIO_IO_CONF(pin)) & (1 << (pin & 31)))
val = readl(GPIO_DATA_IN(pin)) ^ readl(GPIO_IN_POL(pin));
else
val = readl(GPIO_OUT(pin));
return (val >> (pin & 31)) & 1;
}
void kw_gpio_set_value(unsigned pin, int value)
{
/* Configure GPIO output value. */
__set_level(pin, value);
}
void kw_gpio_set_blink(unsigned pin, int blink)
{
/* Set output value to zero. */
__set_level(pin, 0);
/* Set blinking. */
__set_blinking(pin, blink);
}

51
include/asm-arm/arch-kirkwood/gpio.h
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@ -0,0 +1,51 @@
/*
* arch/asm-arm/mach-kirkwood/include/mach/gpio.h
*
* 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.
*/
/*
* Based on (mostly copied from) plat-orion based Linux 2.6 kernel driver.
* Removed kernel level irq handling. Took some macros from kernel to
* allow build.
*
* Dieter Kiermaier dk-arm-linux@gmx.de
*/
#ifndef __KIRKWOOD_GPIO_H
#define __KIRKWOOD_GPIO_H
/* got from kernel include/linux/kernel.h */
#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
/* got from kernel include/linux/bitops.h */
#define BITS_PER_BYTE 8
#define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long))
#define GPIO_MAX 50
#define GPIO_OFF(pin) (((pin) >> 5) ? 0x0040 : 0x0000)
#define GPIO_OUT(pin) (KW_GPIO0_BASE + GPIO_OFF(pin) + 0x00)
#define GPIO_IO_CONF(pin) (KW_GPIO0_BASE + GPIO_OFF(pin) + 0x04)
#define GPIO_BLINK_EN(pin) (KW_GPIO0_BASE + GPIO_OFF(pin) + 0x08)
#define GPIO_IN_POL(pin) (KW_GPIO0_BASE + GPIO_OFF(pin) + 0x0c)
#define GPIO_DATA_IN(pin) (KW_GPIO0_BASE + GPIO_OFF(pin) + 0x10)
#define GPIO_EDGE_CAUSE(pin) (KW_GPIO0_BASE + GPIO_OFF(pin) + 0x14)
#define GPIO_EDGE_MASK(pin) (KW_GPIO0_BASE + GPIO_OFF(pin) + 0x18)
#define GPIO_LEVEL_MASK(pin) (KW_GPIO0_BASE + GPIO_OFF(pin) + 0x1c)
/*
* Kirkwood-specific GPIO API
*/
int kw_gpio_is_valid(unsigned pin, int mode);
int kw_gpio_direction_input(unsigned pin);
int kw_gpio_direction_output(unsigned pin, int value);
int kw_gpio_get_value(unsigned pin);
void kw_gpio_set_value(unsigned pin, int value);
void kw_gpio_set_blink(unsigned pin, int blink);
void kw_gpio_set_unused(unsigned pin);
#define GPIO_INPUT_OK (1 << 0)
#define GPIO_OUTPUT_OK (1 << 1)
#endif
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