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sh: mach-sdk7786: Add support for fpga gpios.

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The sdk7786 FPGA supports a number of user settable input switches that
are otherwise unused. This wires up a dummy gpio chip for the switch bank
to simply expose them to userspace.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt 2010-10-14 03:04:44 +09:00
parent 550a1ef18a
commit 47da88f366
3 changed files with 52 additions and 0 deletions
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1
arch/sh/boards/Kconfig
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@ -155,6 +155,7 @@ config SH_SDK7786
depends on CPU_SUBTYPE_SH7786
select SYS_SUPPORTS_PCI
select NO_IOPORT if !PCI
select ARCH_WANT_OPTIONAL_GPIOLIB
help
Select SDK7786 if configuring for a Renesas Technology Europe
SH7786-65nm board.

2
arch/sh/boards/mach-sdk7786/Makefile
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@ -1 +1,3 @@
obj-y := setup.o fpga.o irq.o
obj-$(CONFIG_GENERIC_GPIO) += gpio.o

49
arch/sh/boards/mach-sdk7786/gpio.c Normal file
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@ -0,0 +1,49 @@
/*
* SDK7786 FPGA USRGPIR Support.
*
* Copyright (C) 2010 Paul Mundt
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/gpio.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/spinlock.h>
#include <linux/io.h>
#include <mach/fpga.h>
#define NR_FPGA_GPIOS 8
static const char *usrgpir_gpio_names[NR_FPGA_GPIOS] = {
"in0", "in1", "in2", "in3", "in4", "in5", "in6", "in7",
};
static int usrgpir_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
{
/* always in */
return 0;
}
static int usrgpir_gpio_get(struct gpio_chip *chip, unsigned gpio)
{
return !!(fpga_read_reg(USRGPIR) & (1 << gpio));
}
static struct gpio_chip usrgpir_gpio_chip = {
.label = "sdk7786-fpga",
.names = usrgpir_gpio_names,
.direction_input = usrgpir_gpio_direction_input,
.get = usrgpir_gpio_get,
.base = -1, /* don't care */
.ngpio = NR_FPGA_GPIOS,
};
static int __init usrgpir_gpio_setup(void)
{
return gpiochip_add(&usrgpir_gpio_chip);
}
device_initcall(usrgpir_gpio_setup);