mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 19:00:25 +00:00
448cf90513
GPIO library does copy the of_node from the parent device of the GPIO chip, there is no need to repeat this in the individual drivers. Remove these assignment all at once. For the details one may look into the of_gpio_dev_init() implementation. While at it, remove duplicate parent device assignment where it is the case. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-By: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com> Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
155 lines
3.8 KiB
C
155 lines
3.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* AMD Promontory GPIO driver
|
|
*
|
|
* Copyright (C) 2015 ASMedia Technology Inc.
|
|
* Author: YD Tseng <yd_tseng@asmedia.com.tw>
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/gpio/driver.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/acpi.h>
|
|
#include <linux/platform_device.h>
|
|
|
|
#define PT_TOTAL_GPIO 8
|
|
#define PT_TOTAL_GPIO_EX 24
|
|
|
|
/* PCI-E MMIO register offsets */
|
|
#define PT_DIRECTION_REG 0x00
|
|
#define PT_INPUTDATA_REG 0x04
|
|
#define PT_OUTPUTDATA_REG 0x08
|
|
#define PT_CLOCKRATE_REG 0x0C
|
|
#define PT_SYNC_REG 0x28
|
|
|
|
struct pt_gpio_chip {
|
|
struct gpio_chip gc;
|
|
void __iomem *reg_base;
|
|
};
|
|
|
|
static int pt_gpio_request(struct gpio_chip *gc, unsigned offset)
|
|
{
|
|
struct pt_gpio_chip *pt_gpio = gpiochip_get_data(gc);
|
|
unsigned long flags;
|
|
u32 using_pins;
|
|
|
|
dev_dbg(gc->parent, "pt_gpio_request offset=%x\n", offset);
|
|
|
|
spin_lock_irqsave(&gc->bgpio_lock, flags);
|
|
|
|
using_pins = readl(pt_gpio->reg_base + PT_SYNC_REG);
|
|
if (using_pins & BIT(offset)) {
|
|
dev_warn(gc->parent, "PT GPIO pin %x reconfigured\n",
|
|
offset);
|
|
spin_unlock_irqrestore(&gc->bgpio_lock, flags);
|
|
return -EINVAL;
|
|
}
|
|
|
|
writel(using_pins | BIT(offset), pt_gpio->reg_base + PT_SYNC_REG);
|
|
|
|
spin_unlock_irqrestore(&gc->bgpio_lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void pt_gpio_free(struct gpio_chip *gc, unsigned offset)
|
|
{
|
|
struct pt_gpio_chip *pt_gpio = gpiochip_get_data(gc);
|
|
unsigned long flags;
|
|
u32 using_pins;
|
|
|
|
spin_lock_irqsave(&gc->bgpio_lock, flags);
|
|
|
|
using_pins = readl(pt_gpio->reg_base + PT_SYNC_REG);
|
|
using_pins &= ~BIT(offset);
|
|
writel(using_pins, pt_gpio->reg_base + PT_SYNC_REG);
|
|
|
|
spin_unlock_irqrestore(&gc->bgpio_lock, flags);
|
|
|
|
dev_dbg(gc->parent, "pt_gpio_free offset=%x\n", offset);
|
|
}
|
|
|
|
static int pt_gpio_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct pt_gpio_chip *pt_gpio;
|
|
int ret = 0;
|
|
|
|
if (!ACPI_COMPANION(dev)) {
|
|
dev_err(dev, "PT GPIO device node not found\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
pt_gpio = devm_kzalloc(dev, sizeof(struct pt_gpio_chip), GFP_KERNEL);
|
|
if (!pt_gpio)
|
|
return -ENOMEM;
|
|
|
|
pt_gpio->reg_base = devm_platform_ioremap_resource(pdev, 0);
|
|
if (IS_ERR(pt_gpio->reg_base)) {
|
|
dev_err(dev, "Failed to map MMIO resource for PT GPIO.\n");
|
|
return PTR_ERR(pt_gpio->reg_base);
|
|
}
|
|
|
|
ret = bgpio_init(&pt_gpio->gc, dev, 4,
|
|
pt_gpio->reg_base + PT_INPUTDATA_REG,
|
|
pt_gpio->reg_base + PT_OUTPUTDATA_REG, NULL,
|
|
pt_gpio->reg_base + PT_DIRECTION_REG, NULL,
|
|
BGPIOF_READ_OUTPUT_REG_SET);
|
|
if (ret) {
|
|
dev_err(dev, "bgpio_init failed\n");
|
|
return ret;
|
|
}
|
|
|
|
pt_gpio->gc.owner = THIS_MODULE;
|
|
pt_gpio->gc.request = pt_gpio_request;
|
|
pt_gpio->gc.free = pt_gpio_free;
|
|
pt_gpio->gc.ngpio = (uintptr_t)device_get_match_data(dev);
|
|
|
|
ret = gpiochip_add_data(&pt_gpio->gc, pt_gpio);
|
|
if (ret) {
|
|
dev_err(dev, "Failed to register GPIO lib\n");
|
|
return ret;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, pt_gpio);
|
|
|
|
/* initialize register setting */
|
|
writel(0, pt_gpio->reg_base + PT_SYNC_REG);
|
|
writel(0, pt_gpio->reg_base + PT_CLOCKRATE_REG);
|
|
|
|
dev_dbg(dev, "PT GPIO driver loaded\n");
|
|
return ret;
|
|
}
|
|
|
|
static int pt_gpio_remove(struct platform_device *pdev)
|
|
{
|
|
struct pt_gpio_chip *pt_gpio = platform_get_drvdata(pdev);
|
|
|
|
gpiochip_remove(&pt_gpio->gc);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct acpi_device_id pt_gpio_acpi_match[] = {
|
|
{ "AMDF030", PT_TOTAL_GPIO },
|
|
{ "AMDIF030", PT_TOTAL_GPIO },
|
|
{ "AMDIF031", PT_TOTAL_GPIO_EX },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(acpi, pt_gpio_acpi_match);
|
|
|
|
static struct platform_driver pt_gpio_driver = {
|
|
.driver = {
|
|
.name = "pt-gpio",
|
|
.acpi_match_table = ACPI_PTR(pt_gpio_acpi_match),
|
|
},
|
|
.probe = pt_gpio_probe,
|
|
.remove = pt_gpio_remove,
|
|
};
|
|
|
|
module_platform_driver(pt_gpio_driver);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("YD Tseng <yd_tseng@asmedia.com.tw>");
|
|
MODULE_DESCRIPTION("AMD Promontory GPIO Driver");
|