/*
|
* Driver for GE FPGA based GPIO
|
*
|
* Author: Martyn Welch <martyn.welch@ge.com>
|
*
|
* 2008 (c) GE Intelligent Platforms Embedded Systems, Inc.
|
*
|
* This file is licensed under the terms of the GNU General Public License
|
* version 2. This program is licensed "as is" without any warranty of any
|
* kind, whether express or implied.
|
*/
|
|
/* TODO
|
*
|
* Configuration of output modes (totem-pole/open-drain)
|
* Interrupt configuration - interrupts are always generated the FPGA relies on
|
* the I/O interrupt controllers mask to stop them propergating
|
*/
|
|
#include <linux/kernel.h>
|
#include <linux/io.h>
|
#include <linux/slab.h>
|
#include <linux/of_device.h>
|
#include <linux/of_address.h>
|
#include <linux/module.h>
|
#include <linux/gpio/driver.h>
|
|
#define GEF_GPIO_DIRECT 0x00
|
#define GEF_GPIO_IN 0x04
|
#define GEF_GPIO_OUT 0x08
|
#define GEF_GPIO_TRIG 0x0C
|
#define GEF_GPIO_POLAR_A 0x10
|
#define GEF_GPIO_POLAR_B 0x14
|
#define GEF_GPIO_INT_STAT 0x18
|
#define GEF_GPIO_OVERRUN 0x1C
|
#define GEF_GPIO_MODE 0x20
|
|
static const struct of_device_id gef_gpio_ids[] = {
|
{
|
.compatible = "gef,sbc610-gpio",
|
.data = (void *)19,
|
}, {
|
.compatible = "gef,sbc310-gpio",
|
.data = (void *)6,
|
}, {
|
.compatible = "ge,imp3a-gpio",
|
.data = (void *)16,
|
},
|
{ }
|
};
|
MODULE_DEVICE_TABLE(of, gef_gpio_ids);
|
|
static int __init gef_gpio_probe(struct platform_device *pdev)
|
{
|
struct gpio_chip *gc;
|
void __iomem *regs;
|
int ret;
|
|
gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL);
|
if (!gc)
|
return -ENOMEM;
|
|
regs = of_iomap(pdev->dev.of_node, 0);
|
if (!regs)
|
return -ENOMEM;
|
|
ret = bgpio_init(gc, &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 */
|
gc->label = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%pOF", pdev->dev.of_node);
|
if (!gc->label) {
|
ret = -ENOMEM;
|
goto err0;
|
}
|
|
gc->base = -1;
|
gc->ngpio = (u16)(uintptr_t)of_device_get_match_data(&pdev->dev);
|
gc->of_gpio_n_cells = 2;
|
gc->of_node = pdev->dev.of_node;
|
|
/* This function adds a memory mapped GPIO chip */
|
ret = devm_gpiochip_add_data(&pdev->dev, gc, NULL);
|
if (ret)
|
goto err0;
|
|
return 0;
|
err0:
|
iounmap(regs);
|
pr_err("%pOF: GPIO chip registration failed\n", pdev->dev.of_node);
|
return ret;
|
};
|
|
static struct platform_driver gef_gpio_driver = {
|
.driver = {
|
.name = "gef-gpio",
|
.of_match_table = gef_gpio_ids,
|
},
|
};
|
module_platform_driver_probe(gef_gpio_driver, gef_gpio_probe);
|
|
MODULE_DESCRIPTION("GE I/O FPGA GPIO driver");
|
MODULE_AUTHOR("Martyn Welch <martyn.welch@ge.com");
|
MODULE_LICENSE("GPL");
|
