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Commit 47da88f3 authored by Paul Mundt's avatar Paul Mundt
Browse files

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



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: default avatarPaul Mundt <lethal@linux-sh.org>
parent 550a1ef1

arch/sh/boards/Kconfig

+1 −0
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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.

arch/sh/boards/mach-sdk7786/Makefile

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obj-y	:= setup.o fpga.o irq.o



obj-$(CONFIG_GENERIC_GPIO)	+= gpio.o

arch/sh/boards/mach-sdk7786/gpio.c

0 → 100644
+49 −0
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/*

 * 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);