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gpio: ge: convert to use basic mmio gpio library 

This patch converts GE GPIO driver to use basic_mmio_gpio
generic library.

Signed-off-by: Kamlakant Patel <kamlakant.patel@linaro.org>
Acked-by: Martyn Welch <martyn.welch@ge.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Kamlakant Patel 2014-12-01 17:39:37 +05:30 committed by Linus Walleij
parent 1fbb29c2f7
commit 866010fb7e
2 changed files with 40 additions and 57 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/gpio/Kconfig
View File

@ -459,6 +459,7 @@ config GPIO_VX855
config GPIO_GE_FPGA
bool "GE FPGA based GPIO"
depends on GE_FPGA
select GPIO_GENERIC
help
Support for common GPIO functionality provided on some GE Single Board
Computers.

96
drivers/gpio/gpio-ge.c
View File

@ -21,7 +21,9 @@
#include <linux/io.h>
#include <linux/of_device.h>
#include <linux/of_gpio.h>
#include <linux/of_address.h>
#include <linux/module.h>
#include <linux/basic_mmio_gpio.h>
#define GEF_GPIO_DIRECT 0x00
#define GEF_GPIO_IN 0x04
@ -33,53 +35,6 @@
#define GEF_GPIO_OVERRUN 0x1C
#define GEF_GPIO_MODE 0x20
static void gef_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
struct of_mm_gpio_chip *mmchip = to_of_mm_gpio_chip(chip);
unsigned int data;
data = ioread32be(mmchip->regs + GEF_GPIO_OUT);
if (value)
data = data | BIT(offset);
else
data = data & ~BIT(offset);
iowrite32be(data, mmchip->regs + GEF_GPIO_OUT);
}
static int gef_gpio_dir_in(struct gpio_chip *chip, unsigned offset)
{
unsigned int data;
struct of_mm_gpio_chip *mmchip = to_of_mm_gpio_chip(chip);
data = ioread32be(mmchip->regs + GEF_GPIO_DIRECT);
data = data | BIT(offset);
iowrite32be(data, mmchip->regs + GEF_GPIO_DIRECT);
return 0;
}
static int gef_gpio_dir_out(struct gpio_chip *chip, unsigned offset, int value)
{
unsigned int data;
struct of_mm_gpio_chip *mmchip = to_of_mm_gpio_chip(chip);
/* Set value before switching to output */
gef_gpio_set(mmchip->regs + GEF_GPIO_OUT, offset, value);
data = ioread32be(mmchip->regs + GEF_GPIO_DIRECT);
data = data & ~BIT(offset);
iowrite32be(data, mmchip->regs + GEF_GPIO_DIRECT);
return 0;
}
static int gef_gpio_get(struct gpio_chip *chip, unsigned offset)
{
struct of_mm_gpio_chip *mmchip = to_of_mm_gpio_chip(chip);
return !!(ioread32be(mmchip->regs + GEF_GPIO_IN) & BIT(offset));
}
static const struct of_device_id gef_gpio_ids[] = {
{
.compatible = "gef,sbc610-gpio",
@ -99,22 +54,49 @@ static int __init gef_gpio_probe(struct platform_device *pdev)
{
const struct of_device_id *of_id =
of_match_device(gef_gpio_ids, &pdev->dev);
struct of_mm_gpio_chip *mmchip;
struct bgpio_chip *bgc;
void __iomem *regs;
int ret;
mmchip = devm_kzalloc(&pdev->dev, sizeof(*mmchip), GFP_KERNEL);
if (!mmchip)
bgc = devm_kzalloc(&pdev->dev, sizeof(*bgc), GFP_KERNEL);
if (!bgc)
return -ENOMEM;
regs = of_iomap(pdev->dev.of_node, 0);
if (!regs)
return -ENOMEM;
ret = bgpio_init(bgc, &pdev->dev, 4, regs + GEF_GPIO_IN,
regs + GEF_GPIO_OUT, NULL, NULL,
regs + GEF_GPIO_DIRECT, BGPIOF_BIG_ENDIAN_BYTE_ORDER);
if (ret) {
dev_err(&pdev->dev, "bgpio_init failed\n");
goto err0;
}
/* Setup pointers to chip functions */
mmchip->gc.ngpio = (u16)(uintptr_t)of_id->data;
mmchip->gc.of_gpio_n_cells = 2;
mmchip->gc.direction_input = gef_gpio_dir_in;
mmchip->gc.direction_output = gef_gpio_dir_out;
mmchip->gc.get = gef_gpio_get;
mmchip->gc.set = gef_gpio_set;
bgc->gc.label = kstrdup(pdev->dev.of_node->full_name, GFP_KERNEL);
if (!bgc->gc.label)
goto err0;
bgc->gc.base = -1;
bgc->gc.ngpio = (u16)(uintptr_t)of_id->data;
bgc->gc.of_gpio_n_cells = 2;
bgc->gc.of_node = pdev->dev.of_node;
/* This function adds a memory mapped GPIO chip */
return of_mm_gpiochip_add(pdev->dev.of_node, mmchip);
ret = gpiochip_add(&bgc->gc);
if (ret)
goto err1;
return 0;
err1:
kfree(bgc->gc.label);
err0:
iounmap(regs);
pr_err("%s: GPIO chip registration failed\n",
pdev->dev.of_node->full_name);
return ret;
};
static struct platform_driver gef_gpio_driver = {