From 47da88f36639b8de57f6cdd680f8c27528ccd67c Mon Sep 17 00:00:00 2001 From: Paul Mundt Date: Thu, 14 Oct 2010 03:04:44 +0900 Subject: 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: Paul Mundt --- arch/sh/boards/mach-sdk7786/Makefile | 2 ++ arch/sh/boards/mach-sdk7786/gpio.c | 49 ++++++++++++++++++++++++++++++++++++ 2 files changed, 51 insertions(+) create mode 100644 arch/sh/boards/mach-sdk7786/gpio.c (limited to 'arch/sh/boards/mach-sdk7786') diff --git a/arch/sh/boards/mach-sdk7786/Makefile b/arch/sh/boards/mach-sdk7786/Makefile index a29f19e85b63..d0f801bd8416 100644 --- a/arch/sh/boards/mach-sdk7786/Makefile +++ b/arch/sh/boards/mach-sdk7786/Makefile @@ -1 +1,3 @@ obj-y := setup.o fpga.o irq.o + +obj-$(CONFIG_GENERIC_GPIO) += gpio.o diff --git a/arch/sh/boards/mach-sdk7786/gpio.c b/arch/sh/boards/mach-sdk7786/gpio.c new file mode 100644 index 000000000000..f71ce09d4e15 --- /dev/null +++ b/arch/sh/boards/mach-sdk7786/gpio.c @@ -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 +#include +#include +#include +#include +#include +#include +#include + +#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); -- cgit v1.2.3-55-g7522