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linux/drivers/gpio/gpio-mpc5200.c
Ricardo Ribalda Delgado f91b2dbba5 gpio: mpc5200: Use of_mm_gpiochip_remove 
Since d621e8bae5 (Create of_mm_gpiochip_remove), there is a
counterpart for of_mm_gpiochip_add.

This patch implements the remove function of the driver making use of
it.

Cc: Alexandre Courbot <gnurou@gmail.com>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2015-01-20 11:18:28 +01:00

389 lines
9.9 KiB
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/*
* MPC52xx gpio driver
*
* Copyright (c) 2008 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
*
* 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/of.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/of_gpio.h>
#include <linux/io.h>
#include <linux/of_platform.h>
#include <linux/module.h>
#include <asm/gpio.h>
#include <asm/mpc52xx.h>
#include <sysdev/fsl_soc.h>
static DEFINE_SPINLOCK(gpio_lock);
struct mpc52xx_gpiochip {
struct of_mm_gpio_chip mmchip;
unsigned int shadow_dvo;
unsigned int shadow_gpioe;
unsigned int shadow_ddr;
};
/*
* GPIO LIB API implementation for wakeup GPIOs.
*
* There's a maximum of 8 wakeup GPIOs. Which of these are available
* for use depends on your board setup.
*
* 0 -> GPIO_WKUP_7
* 1 -> GPIO_WKUP_6
* 2 -> PSC6_1
* 3 -> PSC6_0
* 4 -> ETH_17
* 5 -> PSC3_9
* 6 -> PSC2_4
* 7 -> PSC1_4
*
*/
static int mpc52xx_wkup_gpio_get(struct gpio_chip *gc, unsigned int gpio)
{
struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
unsigned int ret;
ret = (in_8(&regs->wkup_ival) >> (7 - gpio)) & 1;
pr_debug("%s: gpio: %d ret: %d\n", __func__, gpio, ret);
return ret;
}
static inline void
__mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
{
struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
struct mpc52xx_gpiochip *chip = container_of(mm_gc,
struct mpc52xx_gpiochip, mmchip);
struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
if (val)
chip->shadow_dvo |= 1 << (7 - gpio);
else
chip->shadow_dvo &= ~(1 << (7 - gpio));
out_8(&regs->wkup_dvo, chip->shadow_dvo);
}
static void
mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
{
unsigned long flags;
spin_lock_irqsave(&gpio_lock, flags);
__mpc52xx_wkup_gpio_set(gc, gpio, val);
spin_unlock_irqrestore(&gpio_lock, flags);
pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
}
static int mpc52xx_wkup_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
{
struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
struct mpc52xx_gpiochip *chip = container_of(mm_gc,
struct mpc52xx_gpiochip, mmchip);
struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
unsigned long flags;
spin_lock_irqsave(&gpio_lock, flags);
/* set the direction */
chip->shadow_ddr &= ~(1 << (7 - gpio));
out_8(&regs->wkup_ddr, chip->shadow_ddr);
/* and enable the pin */
chip->shadow_gpioe |= 1 << (7 - gpio);
out_8(&regs->wkup_gpioe, chip->shadow_gpioe);
spin_unlock_irqrestore(&gpio_lock, flags);
return 0;
}
static int
mpc52xx_wkup_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
{
struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
struct mpc52xx_gpiochip *chip = container_of(mm_gc,
struct mpc52xx_gpiochip, mmchip);
unsigned long flags;
spin_lock_irqsave(&gpio_lock, flags);
__mpc52xx_wkup_gpio_set(gc, gpio, val);
/* Then set direction */
chip->shadow_ddr |= 1 << (7 - gpio);
out_8(&regs->wkup_ddr, chip->shadow_ddr);
/* Finally enable the pin */
chip->shadow_gpioe |= 1 << (7 - gpio);
out_8(&regs->wkup_gpioe, chip->shadow_gpioe);
spin_unlock_irqrestore(&gpio_lock, flags);
pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
return 0;
}
static int mpc52xx_wkup_gpiochip_probe(struct platform_device *ofdev)
{
struct mpc52xx_gpiochip *chip;
struct mpc52xx_gpio_wkup __iomem *regs;
struct gpio_chip *gc;
int ret;
chip = devm_kzalloc(&ofdev->dev, sizeof(*chip), GFP_KERNEL);
if (!chip)
return -ENOMEM;
platform_set_drvdata(ofdev, chip);
gc = &chip->mmchip.gc;
gc->ngpio = 8;
gc->direction_input = mpc52xx_wkup_gpio_dir_in;
gc->direction_output = mpc52xx_wkup_gpio_dir_out;
gc->get = mpc52xx_wkup_gpio_get;
gc->set = mpc52xx_wkup_gpio_set;
ret = of_mm_gpiochip_add(ofdev->dev.of_node, &chip->mmchip);
if (ret)
return ret;
regs = chip->mmchip.regs;
chip->shadow_gpioe = in_8(&regs->wkup_gpioe);
chip->shadow_ddr = in_8(&regs->wkup_ddr);
chip->shadow_dvo = in_8(&regs->wkup_dvo);
return 0;
}
static int mpc52xx_gpiochip_remove(struct platform_device *ofdev)
{
struct mpc52xx_gpiochip *chip = platform_get_drvdata(ofdev);
of_mm_gpiochip_remove(&chip->mmchip);
return 0;
}
static const struct of_device_id mpc52xx_wkup_gpiochip_match[] = {
{ .compatible = "fsl,mpc5200-gpio-wkup", },
{}
};
static struct platform_driver mpc52xx_wkup_gpiochip_driver = {
.driver = {
.name = "mpc5200-gpio-wkup",
.of_match_table = mpc52xx_wkup_gpiochip_match,
},
.probe = mpc52xx_wkup_gpiochip_probe,
.remove = mpc52xx_gpiochip_remove,
};
/*
* GPIO LIB API implementation for simple GPIOs
*
* There's a maximum of 32 simple GPIOs. Which of these are available
* for use depends on your board setup.
* The numbering reflects the bit numbering in the port registers:
*
* 0..1 > reserved
* 2..3 > IRDA
* 4..7 > ETHR
* 8..11 > reserved
* 12..15 > USB
* 16..17 > reserved
* 18..23 > PSC3
* 24..27 > PSC2
* 28..31 > PSC1
*/
static int mpc52xx_simple_gpio_get(struct gpio_chip *gc, unsigned int gpio)
{
struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
unsigned int ret;
ret = (in_be32(&regs->simple_ival) >> (31 - gpio)) & 1;
return ret;
}
static inline void
__mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
{
struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
struct mpc52xx_gpiochip *chip = container_of(mm_gc,
struct mpc52xx_gpiochip, mmchip);
struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
if (val)
chip->shadow_dvo |= 1 << (31 - gpio);
else
chip->shadow_dvo &= ~(1 << (31 - gpio));
out_be32(&regs->simple_dvo, chip->shadow_dvo);
}
static void
mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
{
unsigned long flags;
spin_lock_irqsave(&gpio_lock, flags);
__mpc52xx_simple_gpio_set(gc, gpio, val);
spin_unlock_irqrestore(&gpio_lock, flags);
pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
}
static int mpc52xx_simple_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
{
struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
struct mpc52xx_gpiochip *chip = container_of(mm_gc,
struct mpc52xx_gpiochip, mmchip);
struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
unsigned long flags;
spin_lock_irqsave(&gpio_lock, flags);
/* set the direction */
chip->shadow_ddr &= ~(1 << (31 - gpio));
out_be32(&regs->simple_ddr, chip->shadow_ddr);
/* and enable the pin */
chip->shadow_gpioe |= 1 << (31 - gpio);
out_be32(&regs->simple_gpioe, chip->shadow_gpioe);
spin_unlock_irqrestore(&gpio_lock, flags);
return 0;
}
static int
mpc52xx_simple_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
{
struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
struct mpc52xx_gpiochip *chip = container_of(mm_gc,
struct mpc52xx_gpiochip, mmchip);
struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
unsigned long flags;
spin_lock_irqsave(&gpio_lock, flags);
/* First set initial value */
__mpc52xx_simple_gpio_set(gc, gpio, val);
/* Then set direction */
chip->shadow_ddr |= 1 << (31 - gpio);
out_be32(&regs->simple_ddr, chip->shadow_ddr);
/* Finally enable the pin */
chip->shadow_gpioe |= 1 << (31 - gpio);
out_be32(&regs->simple_gpioe, chip->shadow_gpioe);
spin_unlock_irqrestore(&gpio_lock, flags);
pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
return 0;
}
static int mpc52xx_simple_gpiochip_probe(struct platform_device *ofdev)
{
struct mpc52xx_gpiochip *chip;
struct gpio_chip *gc;
struct mpc52xx_gpio __iomem *regs;
int ret;
chip = devm_kzalloc(&ofdev->dev, sizeof(*chip), GFP_KERNEL);
if (!chip)
return -ENOMEM;
platform_set_drvdata(ofdev, chip);
gc = &chip->mmchip.gc;
gc->ngpio = 32;
gc->direction_input = mpc52xx_simple_gpio_dir_in;
gc->direction_output = mpc52xx_simple_gpio_dir_out;
gc->get = mpc52xx_simple_gpio_get;
gc->set = mpc52xx_simple_gpio_set;
ret = of_mm_gpiochip_add(ofdev->dev.of_node, &chip->mmchip);
if (ret)
return ret;
regs = chip->mmchip.regs;
chip->shadow_gpioe = in_be32(&regs->simple_gpioe);
chip->shadow_ddr = in_be32(&regs->simple_ddr);
chip->shadow_dvo = in_be32(&regs->simple_dvo);
return 0;
}
static const struct of_device_id mpc52xx_simple_gpiochip_match[] = {
{ .compatible = "fsl,mpc5200-gpio", },
{}
};
static struct platform_driver mpc52xx_simple_gpiochip_driver = {
.driver = {
.name = "mpc5200-gpio",
.of_match_table = mpc52xx_simple_gpiochip_match,
},
.probe = mpc52xx_simple_gpiochip_probe,
.remove = mpc52xx_gpiochip_remove,
};
static int __init mpc52xx_gpio_init(void)
{
if (platform_driver_register(&mpc52xx_wkup_gpiochip_driver))
printk(KERN_ERR "Unable to register wakeup GPIO driver\n");
if (platform_driver_register(&mpc52xx_simple_gpiochip_driver))
printk(KERN_ERR "Unable to register simple GPIO driver\n");
return 0;
}
/* Make sure we get initialised before anyone else tries to use us */
subsys_initcall(mpc52xx_gpio_init);
static void __exit mpc52xx_gpio_exit(void)
{
platform_driver_unregister(&mpc52xx_wkup_gpiochip_driver);
platform_driver_unregister(&mpc52xx_simple_gpiochip_driver);
}
module_exit(mpc52xx_gpio_exit);
MODULE_DESCRIPTION("Freescale MPC52xx gpio driver");
MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de");
MODULE_LICENSE("GPL v2");
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