forked from luck/tmp_suning_uos_patched
gpio: add GPIO driver for the Timberdale FPGA
A GPIO driver for the Timberdale FPGA found on the Intel Atom board Russellville. The GPIO driver also has an IRQ-chip to support interrupts on the pins. Signed-off-by: Richard Röjfors <richard.rojfors@mocean-labs.com> Cc: David Brownell <david-b@pacbell.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Richard Röjfors
Linus Torvalds
parent
4efec6272e
commit
35570ac603
|
|
@ -206,6 +206,12 @@ config GPIO_LANGWELL
|
|||
help
|
||||
Say Y here to support Intel Moorestown platform GPIO.
|
||||
|
||||
config GPIO_TIMBERDALE
|
||||
bool "Support for timberdale GPIO IP"
|
||||
depends on MFD_TIMBERDALE && GPIOLIB && HAS_IOMEM
|
||||
---help---
|
||||
Add support for the GPIO IP in the timberdale FPGA.
|
||||
|
||||
comment "SPI GPIO expanders:"
|
||||
|
||||
config GPIO_MAX7301
|
||||
|
|
|
|||
|
|
@ -13,6 +13,7 @@ obj-$(CONFIG_GPIO_MCP23S08) += mcp23s08.o
|
|||
obj-$(CONFIG_GPIO_PCA953X) += pca953x.o
|
||||
obj-$(CONFIG_GPIO_PCF857X) += pcf857x.o
|
||||
obj-$(CONFIG_GPIO_PL061) += pl061.o
|
||||
obj-$(CONFIG_GPIO_TIMBERDALE) += timbgpio.o
|
||||
obj-$(CONFIG_GPIO_TWL4030) += twl4030-gpio.o
|
||||
obj-$(CONFIG_GPIO_UCB1400) += ucb1400_gpio.o
|
||||
obj-$(CONFIG_GPIO_XILINX) += xilinx_gpio.o
|
||||
|
|
|
|||
342
drivers/gpio/timbgpio.c
Normal file
342
drivers/gpio/timbgpio.c
Normal file
|
|
@ -0,0 +1,342 @@
|
|||
/*
|
||||
* timbgpio.c timberdale FPGA GPIO driver
|
||||
* Copyright (c) 2009 Intel Corporation
|
||||
*
|
||||
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
|
||||
*/
|
||||
|
||||
/* Supports:
|
||||
* Timberdale FPGA GPIO
|
||||
*/
|
||||
|
||||
#include <linux/module.h>
|
||||
#include <linux/gpio.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/io.h>
|
||||
#include <linux/timb_gpio.h>
|
||||
#include <linux/interrupt.h>
|
||||
|
||||
#define DRIVER_NAME "timb-gpio"
|
||||
|
||||
#define TGPIOVAL 0x00
|
||||
#define TGPIODIR 0x04
|
||||
#define TGPIO_IER 0x08
|
||||
#define TGPIO_ISR 0x0c
|
||||
#define TGPIO_IPR 0x10
|
||||
#define TGPIO_ICR 0x14
|
||||
#define TGPIO_FLR 0x18
|
||||
#define TGPIO_LVR 0x1c
|
||||
|
||||
struct timbgpio {
|
||||
void __iomem *membase;
|
||||
spinlock_t lock; /* mutual exclusion */
|
||||
struct gpio_chip gpio;
|
||||
int irq_base;
|
||||
};
|
||||
|
||||
static int timbgpio_update_bit(struct gpio_chip *gpio, unsigned index,
|
||||
unsigned offset, bool enabled)
|
||||
{
|
||||
struct timbgpio *tgpio = container_of(gpio, struct timbgpio, gpio);
|
||||
u32 reg;
|
||||
|
||||
spin_lock(&tgpio->lock);
|
||||
reg = ioread32(tgpio->membase + offset);
|
||||
|
||||
if (enabled)
|
||||
reg |= (1 << index);
|
||||
else
|
||||
reg &= ~(1 << index);
|
||||
|
||||
iowrite32(reg, tgpio->membase + offset);
|
||||
spin_unlock(&tgpio->lock);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int timbgpio_gpio_direction_input(struct gpio_chip *gpio, unsigned nr)
|
||||
{
|
||||
return timbgpio_update_bit(gpio, nr, TGPIODIR, true);
|
||||
}
|
||||
|
||||
static int timbgpio_gpio_get(struct gpio_chip *gpio, unsigned nr)
|
||||
{
|
||||
struct timbgpio *tgpio = container_of(gpio, struct timbgpio, gpio);
|
||||
u32 value;
|
||||
|
||||
value = ioread32(tgpio->membase + TGPIOVAL);
|
||||
return (value & (1 << nr)) ? 1 : 0;
|
||||
}
|
||||
|
||||
static int timbgpio_gpio_direction_output(struct gpio_chip *gpio,
|
||||
unsigned nr, int val)
|
||||
{
|
||||
return timbgpio_update_bit(gpio, nr, TGPIODIR, false);
|
||||
}
|
||||
|
||||
static void timbgpio_gpio_set(struct gpio_chip *gpio,
|
||||
unsigned nr, int val)
|
||||
{
|
||||
timbgpio_update_bit(gpio, nr, TGPIOVAL, val != 0);
|
||||
}
|
||||
|
||||
static int timbgpio_to_irq(struct gpio_chip *gpio, unsigned offset)
|
||||
{
|
||||
struct timbgpio *tgpio = container_of(gpio, struct timbgpio, gpio);
|
||||
|
||||
if (tgpio->irq_base <= 0)
|
||||
return -EINVAL;
|
||||
|
||||
return tgpio->irq_base + offset;
|
||||
}
|
||||
|
||||
/*
|
||||
* GPIO IRQ
|
||||
*/
|
||||
static void timbgpio_irq_disable(unsigned irq)
|
||||
{
|
||||
struct timbgpio *tgpio = get_irq_chip_data(irq);
|
||||
int offset = irq - tgpio->irq_base;
|
||||
|
||||
timbgpio_update_bit(&tgpio->gpio, offset, TGPIO_IER, 0);
|
||||
}
|
||||
|
||||
static void timbgpio_irq_enable(unsigned irq)
|
||||
{
|
||||
struct timbgpio *tgpio = get_irq_chip_data(irq);
|
||||
int offset = irq - tgpio->irq_base;
|
||||
|
||||
timbgpio_update_bit(&tgpio->gpio, offset, TGPIO_IER, 1);
|
||||
}
|
||||
|
||||
static int timbgpio_irq_type(unsigned irq, unsigned trigger)
|
||||
{
|
||||
struct timbgpio *tgpio = get_irq_chip_data(irq);
|
||||
int offset = irq - tgpio->irq_base;
|
||||
unsigned long flags;
|
||||
u32 lvr, flr;
|
||||
|
||||
if (offset < 0 || offset > tgpio->gpio.ngpio)
|
||||
return -EINVAL;
|
||||
|
||||
spin_lock_irqsave(&tgpio->lock, flags);
|
||||
|
||||
lvr = ioread32(tgpio->membase + TGPIO_LVR);
|
||||
flr = ioread32(tgpio->membase + TGPIO_FLR);
|
||||
|
||||
if (trigger & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW)) {
|
||||
flr &= ~(1 << offset);
|
||||
if (trigger & IRQ_TYPE_LEVEL_HIGH)
|
||||
lvr |= 1 << offset;
|
||||
else
|
||||
lvr &= ~(1 << offset);
|
||||
}
|
||||
|
||||
if ((trigger & IRQ_TYPE_EDGE_BOTH) == IRQ_TYPE_EDGE_BOTH)
|
||||
return -EINVAL;
|
||||
else {
|
||||
flr |= 1 << offset;
|
||||
/* opposite compared to the datasheet, but it mirrors the
|
||||
* reality
|
||||
*/
|
||||
if (trigger & IRQ_TYPE_EDGE_FALLING)
|
||||
lvr |= 1 << offset;
|
||||
else
|
||||
lvr &= ~(1 << offset);
|
||||
}
|
||||
|
||||
iowrite32(lvr, tgpio->membase + TGPIO_LVR);
|
||||
iowrite32(flr, tgpio->membase + TGPIO_FLR);
|
||||
iowrite32(1 << offset, tgpio->membase + TGPIO_ICR);
|
||||
spin_unlock_irqrestore(&tgpio->lock, flags);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void timbgpio_irq(unsigned int irq, struct irq_desc *desc)
|
||||
{
|
||||
struct timbgpio *tgpio = get_irq_data(irq);
|
||||
unsigned long ipr;
|
||||
int offset;
|
||||
|
||||
desc->chip->ack(irq);
|
||||
ipr = ioread32(tgpio->membase + TGPIO_IPR);
|
||||
iowrite32(ipr, tgpio->membase + TGPIO_ICR);
|
||||
|
||||
for_each_bit(offset, &ipr, tgpio->gpio.ngpio)
|
||||
generic_handle_irq(timbgpio_to_irq(&tgpio->gpio, offset));
|
||||
}
|
||||
|
||||
static struct irq_chip timbgpio_irqchip = {
|
||||
.name = "GPIO",
|
||||
.enable = timbgpio_irq_enable,
|
||||
.disable = timbgpio_irq_disable,
|
||||
.set_type = timbgpio_irq_type,
|
||||
};
|
||||
|
||||
static int __devinit timbgpio_probe(struct platform_device *pdev)
|
||||
{
|
||||
int err, i;
|
||||
struct gpio_chip *gc;
|
||||
struct timbgpio *tgpio;
|
||||
struct resource *iomem;
|
||||
struct timbgpio_platform_data *pdata = pdev->dev.platform_data;
|
||||
int irq = platform_get_irq(pdev, 0);
|
||||
|
||||
if (!pdata || pdata->nr_pins > 32) {
|
||||
err = -EINVAL;
|
||||
goto err_mem;
|
||||
}
|
||||
|
||||
iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||||
if (!iomem) {
|
||||
err = -EINVAL;
|
||||
goto err_mem;
|
||||
}
|
||||
|
||||
tgpio = kzalloc(sizeof(*tgpio), GFP_KERNEL);
|
||||
if (!tgpio) {
|
||||
err = -EINVAL;
|
||||
goto err_mem;
|
||||
}
|
||||
tgpio->irq_base = pdata->irq_base;
|
||||
|
||||
spin_lock_init(&tgpio->lock);
|
||||
|
||||
if (!request_mem_region(iomem->start, resource_size(iomem),
|
||||
DRIVER_NAME)) {
|
||||
err = -EBUSY;
|
||||
goto err_request;
|
||||
}
|
||||
|
||||
tgpio->membase = ioremap(iomem->start, resource_size(iomem));
|
||||
if (!tgpio->membase) {
|
||||
err = -ENOMEM;
|
||||
goto err_ioremap;
|
||||
}
|
||||
|
||||
gc = &tgpio->gpio;
|
||||
|
||||
gc->label = dev_name(&pdev->dev);
|
||||
gc->owner = THIS_MODULE;
|
||||
gc->dev = &pdev->dev;
|
||||
gc->direction_input = timbgpio_gpio_direction_input;
|
||||
gc->get = timbgpio_gpio_get;
|
||||
gc->direction_output = timbgpio_gpio_direction_output;
|
||||
gc->set = timbgpio_gpio_set;
|
||||
gc->to_irq = (irq >= 0 && tgpio->irq_base > 0) ? timbgpio_to_irq : NULL;
|
||||
gc->dbg_show = NULL;
|
||||
gc->base = pdata->gpio_base;
|
||||
gc->ngpio = pdata->nr_pins;
|
||||
gc->can_sleep = 0;
|
||||
|
||||
err = gpiochip_add(gc);
|
||||
if (err)
|
||||
goto err_chipadd;
|
||||
|
||||
platform_set_drvdata(pdev, tgpio);
|
||||
|
||||
/* make sure to disable interrupts */
|
||||
iowrite32(0x0, tgpio->membase + TGPIO_IER);
|
||||
|
||||
if (irq < 0 || tgpio->irq_base <= 0)
|
||||
return 0;
|
||||
|
||||
for (i = 0; i < pdata->nr_pins; i++) {
|
||||
set_irq_chip_and_handler_name(tgpio->irq_base + i,
|
||||
&timbgpio_irqchip, handle_simple_irq, "mux");
|
||||
set_irq_chip_data(tgpio->irq_base + i, tgpio);
|
||||
#ifdef CONFIG_ARM
|
||||
set_irq_flags(tgpio->irq_base + i, IRQF_VALID | IRQF_PROBE);
|
||||
#endif
|
||||
}
|
||||
|
||||
set_irq_data(irq, tgpio);
|
||||
set_irq_chained_handler(irq, timbgpio_irq);
|
||||
|
||||
return 0;
|
||||
|
||||
err_chipadd:
|
||||
iounmap(tgpio->membase);
|
||||
err_ioremap:
|
||||
release_mem_region(iomem->start, resource_size(iomem));
|
||||
err_request:
|
||||
kfree(tgpio);
|
||||
err_mem:
|
||||
printk(KERN_ERR DRIVER_NAME": Failed to register GPIOs: %d\n", err);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
static int __devexit timbgpio_remove(struct platform_device *pdev)
|
||||
{
|
||||
int err;
|
||||
struct timbgpio_platform_data *pdata = pdev->dev.platform_data;
|
||||
struct timbgpio *tgpio = platform_get_drvdata(pdev);
|
||||
struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||||
int irq = platform_get_irq(pdev, 0);
|
||||
|
||||
if (irq >= 0 && tgpio->irq_base > 0) {
|
||||
int i;
|
||||
for (i = 0; i < pdata->nr_pins; i++) {
|
||||
set_irq_chip(tgpio->irq_base + i, NULL);
|
||||
set_irq_chip_data(tgpio->irq_base + i, NULL);
|
||||
}
|
||||
|
||||
set_irq_handler(irq, NULL);
|
||||
set_irq_data(irq, NULL);
|
||||
}
|
||||
|
||||
err = gpiochip_remove(&tgpio->gpio);
|
||||
if (err)
|
||||
printk(KERN_ERR DRIVER_NAME": failed to remove gpio_chip\n");
|
||||
|
||||
iounmap(tgpio->membase);
|
||||
release_mem_region(iomem->start, resource_size(iomem));
|
||||
kfree(tgpio);
|
||||
|
||||
platform_set_drvdata(pdev, NULL);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct platform_driver timbgpio_platform_driver = {
|
||||
.driver = {
|
||||
.name = DRIVER_NAME,
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
.probe = timbgpio_probe,
|
||||
.remove = timbgpio_remove,
|
||||
};
|
||||
|
||||
/*--------------------------------------------------------------------------*/
|
||||
|
||||
static int __init timbgpio_init(void)
|
||||
{
|
||||
return platform_driver_register(&timbgpio_platform_driver);
|
||||
}
|
||||
|
||||
static void __exit timbgpio_exit(void)
|
||||
{
|
||||
platform_driver_unregister(&timbgpio_platform_driver);
|
||||
}
|
||||
|
||||
module_init(timbgpio_init);
|
||||
module_exit(timbgpio_exit);
|
||||
|
||||
MODULE_DESCRIPTION("Timberdale GPIO driver");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
MODULE_AUTHOR("Mocean Laboratories");
|
||||
MODULE_ALIAS("platform:"DRIVER_NAME);
|
||||
|
||||
37
include/linux/timb_gpio.h
Normal file
37
include/linux/timb_gpio.h
Normal file
|
|
@ -0,0 +1,37 @@
|
|||
/*
|
||||
* timb_gpio.h timberdale FPGA GPIO driver, platform data definition
|
||||
* Copyright (c) 2009 Intel Corporation
|
||||
*
|
||||
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
|
||||
*/
|
||||
|
||||
#ifndef _LINUX_TIMB_GPIO_H
|
||||
#define _LINUX_TIMB_GPIO_H
|
||||
|
||||
/**
|
||||
* struct timbgpio_platform_data - Platform data of the Timberdale GPIO driver
|
||||
* @gpio_base The number of the first GPIO pin, set to -1 for
|
||||
* dynamic number allocation.
|
||||
* @nr_pins Number of pins that is supported by the hardware (1-32)
|
||||
* @irq_base If IRQ is supported by the hardware, this is the base
|
||||
* number of IRQ:s. One IRQ per pin will be used. Set to
|
||||
* -1 if IRQ:s is not supported.
|
||||
*/
|
||||
struct timbgpio_platform_data {
|
||||
int gpio_base;
|
||||
int nr_pins;
|
||||
int irq_base;
|
||||
};
|
||||
|
||||
#endif
|
||||
Loading…
Reference in New Issue
Block a user