Commit 8a87a996 authored by Andrew Victor's avatar Andrew Victor Committed by Russell King

[ARM] 4377/1: KS8695: GPIO driver

Driver to control the GPIO pins on the KS8695 processor.
The driver natively supports the Generic GPIO interface.
Signed-off-by: default avatarAndrew Victor <andrew@sanpeople.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 7dcca30a
......@@ -308,6 +308,7 @@ config ARCH_L7200
config ARCH_KS8695
bool "Micrel/Kendin KS8695"
select GENERIC_GPIO
help
Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
System-on-Chip devices.
......
......@@ -3,7 +3,7 @@
# Makefile for KS8695 architecture support
#
obj-y := cpu.o irq.o time.o devices.o
obj-y := cpu.o irq.o time.o gpio.o devices.o
obj-m :=
obj-n :=
obj- :=
......
/*
* arch/arm/mach-ks8695/gpio.c
*
* Copyright (C) 2006 Andrew Victor
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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 <linux/kernel.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/module.h>
#include <asm/io.h>
#include <asm/hardware.h>
#include <asm/mach/irq.h>
#include <asm/arch/regs-gpio.h>
#include <asm/arch/gpio.h>
/*
* Configure a GPIO line for either GPIO function, or its internal
* function (Interrupt, Timer, etc).
*/
static void __init_or_module ks8695_gpio_mode(unsigned int pin, short gpio)
{
unsigned int enable[] = { IOPC_IOEINT0EN, IOPC_IOEINT1EN, IOPC_IOEINT2EN, IOPC_IOEINT3EN, IOPC_IOTIM0EN, IOPC_IOTIM1EN };
unsigned long x, flags;
if (pin > KS8695_GPIO_5) /* only GPIO 0..5 have internal functions */
return;
local_irq_save(flags);
x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPC);
if (gpio) /* GPIO: set bit to 0 */
x &= ~enable[pin];
else /* Internal function: set bit to 1 */
x |= enable[pin];
__raw_writel(x, KS8695_GPIO_VA + KS8695_IOPC);
local_irq_restore(flags);
}
static unsigned short gpio_irq[] = { KS8695_IRQ_EXTERN0, KS8695_IRQ_EXTERN1, KS8695_IRQ_EXTERN2, KS8695_IRQ_EXTERN3 };
/*
* Configure GPIO pin as external interrupt source.
*/
int __init_or_module ks8695_gpio_interrupt(unsigned int pin, unsigned int type)
{
unsigned long x, flags;
if (pin > KS8695_GPIO_3) /* only GPIO 0..3 can generate IRQ */
return -EINVAL;
local_irq_save(flags);
/* set pin as input */
x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPM);
x &= ~IOPM_(pin);
__raw_writel(x, KS8695_GPIO_VA + KS8695_IOPM);
local_irq_restore(flags);
/* Set IRQ triggering type */
set_irq_type(gpio_irq[pin], type);
/* enable interrupt mode */
ks8695_gpio_mode(pin, 0);
return 0;
}
EXPORT_SYMBOL(ks8695_gpio_interrupt);
/* .... Generic GPIO interface .............................................. */
/*
* Configure the GPIO line as an input.
*/
int __init_or_module gpio_direction_input(unsigned int pin)
{
unsigned long x, flags;
if (pin > KS8695_GPIO_15)
return -EINVAL;
/* set pin to GPIO mode */
ks8695_gpio_mode(pin, 1);
local_irq_save(flags);
/* set pin as input */
x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPM);
x &= ~IOPM_(pin);
__raw_writel(x, KS8695_GPIO_VA + KS8695_IOPM);
local_irq_restore(flags);
return 0;
}
EXPORT_SYMBOL(gpio_direction_input);
/*
* Configure the GPIO line as an output, with default state.
*/
int __init_or_module gpio_direction_output(unsigned int pin, unsigned int state)
{
unsigned long x, flags;
if (pin > KS8695_GPIO_15)
return -EINVAL;
/* set pin to GPIO mode */
ks8695_gpio_mode(pin, 1);
local_irq_save(flags);
/* set line state */
x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPD);
if (state)
x |= (1 << pin);
else
x &= ~(1 << pin);
__raw_writel(x, KS8695_GPIO_VA + KS8695_IOPD);
/* set pin as output */
x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPM);
x |= IOPM_(pin);
__raw_writel(x, KS8695_GPIO_VA + KS8695_IOPM);
local_irq_restore(flags);
return 0;
}
EXPORT_SYMBOL(gpio_direction_output);
/*
* Set the state of an output GPIO line.
*/
void gpio_set_value(unsigned int pin, unsigned int state)
{
unsigned long x, flags;
if (pin > KS8695_GPIO_15)
return;
local_irq_save(flags);
/* set output line state */
x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPD);
if (state)
x |= (1 << pin);
else
x &= ~(1 << pin);
__raw_writel(x, KS8695_GPIO_VA + KS8695_IOPD);
local_irq_restore(flags);
}
EXPORT_SYMBOL(gpio_set_value);
/*
* Read the state of a GPIO line.
*/
int gpio_get_value(unsigned int pin)
{
unsigned long x;
if (pin > KS8695_GPIO_15)
return -EINVAL;
x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPD);
return (x & (1 << pin)) != 0;
}
EXPORT_SYMBOL(gpio_get_value);
/*
* Map GPIO line to IRQ number.
*/
int gpio_to_irq(unsigned int pin)
{
if (pin > KS8695_GPIO_3) /* only GPIO 0..3 can generate IRQ */
return -EINVAL;
return gpio_irq[pin];
}
EXPORT_SYMBOL(gpio_to_irq);
/*
* Map IRQ number to GPIO line.
*/
int irq_to_gpio(unsigned int irq)
{
if ((irq < KS8695_IRQ_EXTERN0) || (irq > KS8695_IRQ_EXTERN3))
return -EINVAL;
return (irq - KS8695_IRQ_EXTERN0);
}
EXPORT_SYMBOL(irq_to_gpio);
/*
* include/asm-arm/arch-ks8695/gpio.h
*
* Copyright (C) 2006 Andrew Victor
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef __ASM_ARCH_GPIO_H_
#define __ASM_ARCH_GPIO_H_
#define KS8695_GPIO_0 0
#define KS8695_GPIO_1 1
#define KS8695_GPIO_2 2
#define KS8695_GPIO_3 3
#define KS8695_GPIO_4 4
#define KS8695_GPIO_5 5
#define KS8695_GPIO_6 6
#define KS8695_GPIO_7 7
#define KS8695_GPIO_8 8
#define KS8695_GPIO_9 9
#define KS8695_GPIO_10 10
#define KS8695_GPIO_11 11
#define KS8695_GPIO_12 12
#define KS8695_GPIO_13 13
#define KS8695_GPIO_14 14
#define KS8695_GPIO_15 15
/*
* Configure GPIO pin as external interrupt source.
*/
int __init_or_module ks8695_gpio_interrupt(unsigned int pin, unsigned int type);
/*
* Configure the GPIO line as an input.
*/
int __init_or_module gpio_direction_input(unsigned int pin);
/*
* Configure the GPIO line as an output, with default state.
*/
int __init_or_module gpio_direction_output(unsigned int pin, unsigned int state);
/*
* Set the state of an output GPIO line.
*/
void gpio_set_value(unsigned int pin, unsigned int state);
/*
* Read the state of a GPIO line.
*/
int gpio_get_value(unsigned int pin);
/*
* Map GPIO line to IRQ number.
*/
int gpio_to_irq(unsigned int pin);
/*
* Map IRQ number to GPIO line.
*/
int irq_to_gpio(unsigned int irq);
#include <asm-generic/gpio.h>
static inline int gpio_request(unsigned int pin, const char *label)
{
return 0;
}
static inline void gpio_free(unsigned int pin)
{
}
#endif
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