mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 19:00:25 +00:00
![Abanoub Sameh](/assets/img/avatar_default.png)
Added a lined between a declaration and other statements according to the kernel coding style. Signed-off-by: Abanoub Sameh <abanoubsameh@protonmail.com> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
225 lines
5.2 KiB
C
225 lines
5.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* GPIO interface for Intel Poulsbo SCH
|
|
*
|
|
* Copyright (c) 2010 CompuLab Ltd
|
|
* Author: Denis Turischev <denis@compulab.co.il>
|
|
*/
|
|
|
|
#include <linux/acpi.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/gpio/driver.h>
|
|
#include <linux/io.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/pci_ids.h>
|
|
#include <linux/platform_device.h>
|
|
|
|
#define GEN 0x00
|
|
#define GIO 0x04
|
|
#define GLV 0x08
|
|
|
|
struct sch_gpio {
|
|
struct gpio_chip chip;
|
|
spinlock_t lock;
|
|
unsigned short iobase;
|
|
unsigned short resume_base;
|
|
};
|
|
|
|
static unsigned int sch_gpio_offset(struct sch_gpio *sch, unsigned int gpio,
|
|
unsigned int reg)
|
|
{
|
|
unsigned int base = 0;
|
|
|
|
if (gpio >= sch->resume_base) {
|
|
gpio -= sch->resume_base;
|
|
base += 0x20;
|
|
}
|
|
|
|
return base + reg + gpio / 8;
|
|
}
|
|
|
|
static unsigned int sch_gpio_bit(struct sch_gpio *sch, unsigned int gpio)
|
|
{
|
|
if (gpio >= sch->resume_base)
|
|
gpio -= sch->resume_base;
|
|
return gpio % 8;
|
|
}
|
|
|
|
static int sch_gpio_reg_get(struct sch_gpio *sch, unsigned int gpio, unsigned int reg)
|
|
{
|
|
unsigned short offset, bit;
|
|
u8 reg_val;
|
|
|
|
offset = sch_gpio_offset(sch, gpio, reg);
|
|
bit = sch_gpio_bit(sch, gpio);
|
|
|
|
reg_val = !!(inb(sch->iobase + offset) & BIT(bit));
|
|
|
|
return reg_val;
|
|
}
|
|
|
|
static void sch_gpio_reg_set(struct sch_gpio *sch, unsigned int gpio, unsigned int reg,
|
|
int val)
|
|
{
|
|
unsigned short offset, bit;
|
|
u8 reg_val;
|
|
|
|
offset = sch_gpio_offset(sch, gpio, reg);
|
|
bit = sch_gpio_bit(sch, gpio);
|
|
|
|
reg_val = inb(sch->iobase + offset);
|
|
|
|
if (val)
|
|
outb(reg_val | BIT(bit), sch->iobase + offset);
|
|
else
|
|
outb((reg_val & ~BIT(bit)), sch->iobase + offset);
|
|
}
|
|
|
|
static int sch_gpio_direction_in(struct gpio_chip *gc, unsigned int gpio_num)
|
|
{
|
|
struct sch_gpio *sch = gpiochip_get_data(gc);
|
|
|
|
spin_lock(&sch->lock);
|
|
sch_gpio_reg_set(sch, gpio_num, GIO, 1);
|
|
spin_unlock(&sch->lock);
|
|
return 0;
|
|
}
|
|
|
|
static int sch_gpio_get(struct gpio_chip *gc, unsigned int gpio_num)
|
|
{
|
|
struct sch_gpio *sch = gpiochip_get_data(gc);
|
|
|
|
return sch_gpio_reg_get(sch, gpio_num, GLV);
|
|
}
|
|
|
|
static void sch_gpio_set(struct gpio_chip *gc, unsigned int gpio_num, int val)
|
|
{
|
|
struct sch_gpio *sch = gpiochip_get_data(gc);
|
|
|
|
spin_lock(&sch->lock);
|
|
sch_gpio_reg_set(sch, gpio_num, GLV, val);
|
|
spin_unlock(&sch->lock);
|
|
}
|
|
|
|
static int sch_gpio_direction_out(struct gpio_chip *gc, unsigned int gpio_num,
|
|
int val)
|
|
{
|
|
struct sch_gpio *sch = gpiochip_get_data(gc);
|
|
|
|
spin_lock(&sch->lock);
|
|
sch_gpio_reg_set(sch, gpio_num, GIO, 0);
|
|
spin_unlock(&sch->lock);
|
|
|
|
/*
|
|
* according to the datasheet, writing to the level register has no
|
|
* effect when GPIO is programmed as input.
|
|
* Actually the the level register is read-only when configured as input.
|
|
* Thus presetting the output level before switching to output is _NOT_ possible.
|
|
* Hence we set the level after configuring the GPIO as output.
|
|
* But we cannot prevent a short low pulse if direction is set to high
|
|
* and an external pull-up is connected.
|
|
*/
|
|
sch_gpio_set(gc, gpio_num, val);
|
|
return 0;
|
|
}
|
|
|
|
static int sch_gpio_get_direction(struct gpio_chip *gc, unsigned int gpio_num)
|
|
{
|
|
struct sch_gpio *sch = gpiochip_get_data(gc);
|
|
|
|
if (sch_gpio_reg_get(sch, gpio_num, GIO))
|
|
return GPIO_LINE_DIRECTION_IN;
|
|
|
|
return GPIO_LINE_DIRECTION_OUT;
|
|
}
|
|
|
|
static const struct gpio_chip sch_gpio_chip = {
|
|
.label = "sch_gpio",
|
|
.owner = THIS_MODULE,
|
|
.direction_input = sch_gpio_direction_in,
|
|
.get = sch_gpio_get,
|
|
.direction_output = sch_gpio_direction_out,
|
|
.set = sch_gpio_set,
|
|
.get_direction = sch_gpio_get_direction,
|
|
};
|
|
|
|
static int sch_gpio_probe(struct platform_device *pdev)
|
|
{
|
|
struct sch_gpio *sch;
|
|
struct resource *res;
|
|
|
|
sch = devm_kzalloc(&pdev->dev, sizeof(*sch), GFP_KERNEL);
|
|
if (!sch)
|
|
return -ENOMEM;
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_IO, 0);
|
|
if (!res)
|
|
return -EBUSY;
|
|
|
|
if (!devm_request_region(&pdev->dev, res->start, resource_size(res),
|
|
pdev->name))
|
|
return -EBUSY;
|
|
|
|
spin_lock_init(&sch->lock);
|
|
sch->iobase = res->start;
|
|
sch->chip = sch_gpio_chip;
|
|
sch->chip.label = dev_name(&pdev->dev);
|
|
sch->chip.parent = &pdev->dev;
|
|
|
|
switch (pdev->id) {
|
|
case PCI_DEVICE_ID_INTEL_SCH_LPC:
|
|
sch->resume_base = 10;
|
|
sch->chip.ngpio = 14;
|
|
|
|
/*
|
|
* GPIO[6:0] enabled by default
|
|
* GPIO7 is configured by the CMC as SLPIOVR
|
|
* Enable GPIO[9:8] core powered gpios explicitly
|
|
*/
|
|
sch_gpio_reg_set(sch, 8, GEN, 1);
|
|
sch_gpio_reg_set(sch, 9, GEN, 1);
|
|
/*
|
|
* SUS_GPIO[2:0] enabled by default
|
|
* Enable SUS_GPIO3 resume powered gpio explicitly
|
|
*/
|
|
sch_gpio_reg_set(sch, 13, GEN, 1);
|
|
break;
|
|
|
|
case PCI_DEVICE_ID_INTEL_ITC_LPC:
|
|
sch->resume_base = 5;
|
|
sch->chip.ngpio = 14;
|
|
break;
|
|
|
|
case PCI_DEVICE_ID_INTEL_CENTERTON_ILB:
|
|
sch->resume_base = 21;
|
|
sch->chip.ngpio = 30;
|
|
break;
|
|
|
|
case PCI_DEVICE_ID_INTEL_QUARK_X1000_ILB:
|
|
sch->resume_base = 2;
|
|
sch->chip.ngpio = 8;
|
|
break;
|
|
|
|
default:
|
|
return -ENODEV;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, sch);
|
|
|
|
return devm_gpiochip_add_data(&pdev->dev, &sch->chip, sch);
|
|
}
|
|
|
|
static struct platform_driver sch_gpio_driver = {
|
|
.driver = {
|
|
.name = "sch_gpio",
|
|
},
|
|
.probe = sch_gpio_probe,
|
|
};
|
|
|
|
module_platform_driver(sch_gpio_driver);
|
|
|
|
MODULE_AUTHOR("Denis Turischev <denis@compulab.co.il>");
|
|
MODULE_DESCRIPTION("GPIO interface for Intel Poulsbo SCH");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_ALIAS("platform:sch_gpio");
|