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path: root/drivers/gpio/gpio-ge.c
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Diffstat (limited to 'drivers/gpio/gpio-ge.c')
-rw-r--r--drivers/gpio/gpio-ge.c174
1 files changed, 53 insertions, 121 deletions
diff --git a/drivers/gpio/gpio-ge.c b/drivers/gpio/gpio-ge.c
index 7b95a4a8318..1237a73c3c9 100644
--- a/drivers/gpio/gpio-ge.c
+++ b/drivers/gpio/gpio-ge.c
@@ -18,15 +18,9 @@
*/
#include <linux/kernel.h>
-#include <linux/compiler.h>
-#include <linux/init.h>
#include <linux/io.h>
-#include <linux/of.h>
#include <linux/of_device.h>
-#include <linux/of_platform.h>
#include <linux/of_gpio.h>
-#include <linux/gpio.h>
-#include <linux/slab.h>
#include <linux/module.h>
#define GEF_GPIO_DIRECT 0x00
@@ -39,28 +33,26 @@
#define GEF_GPIO_OVERRUN 0x1C
#define GEF_GPIO_MODE 0x20
-static void _gef_gpio_set(void __iomem *reg, unsigned int offset, int value)
+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(reg);
- /* value: 0=low; 1=high */
- if (value & 0x1)
- data = data | (0x1 << offset);
+ data = ioread32be(mmchip->regs + GEF_GPIO_OUT);
+ if (value)
+ data = data | BIT(offset);
else
- data = data & ~(0x1 << offset);
-
- iowrite32be(data, reg);
+ 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 | (0x1 << offset);
+ data = data | BIT(offset);
iowrite32be(data, mmchip->regs + GEF_GPIO_DIRECT);
return 0;
@@ -71,11 +63,11 @@ 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 direction before switching to input */
- _gef_gpio_set(mmchip->regs + GEF_GPIO_OUT, offset, value);
+ /* 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 & ~(0x1 << offset);
+ data = data & ~BIT(offset);
iowrite32be(data, mmchip->regs + GEF_GPIO_DIRECT);
return 0;
@@ -83,116 +75,56 @@ static int gef_gpio_dir_out(struct gpio_chip *chip, unsigned offset, int value)
static int gef_gpio_get(struct gpio_chip *chip, unsigned offset)
{
- unsigned int data;
- int state = 0;
struct of_mm_gpio_chip *mmchip = to_of_mm_gpio_chip(chip);
- data = ioread32be(mmchip->regs + GEF_GPIO_IN);
- state = (int)((data >> offset) & 0x1);
-
- return state;
+ return !!(ioread32be(mmchip->regs + GEF_GPIO_IN) & BIT(offset));
}
-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);
-
- _gef_gpio_set(mmchip->regs + GEF_GPIO_OUT, offset, value);
-}
+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_init(void)
+static int __init gef_gpio_probe(struct platform_device *pdev)
{
- struct device_node *np;
- int retval;
- struct of_mm_gpio_chip *gef_gpio_chip;
-
- for_each_compatible_node(np, NULL, "gef,sbc610-gpio") {
-
- pr_debug("%s: Initialising GEF GPIO\n", np->full_name);
-
- /* Allocate chip structure */
- gef_gpio_chip = kzalloc(sizeof(*gef_gpio_chip), GFP_KERNEL);
- if (!gef_gpio_chip) {
- pr_err("%s: Unable to allocate structure\n",
- np->full_name);
- continue;
- }
-
- /* Setup pointers to chip functions */
- gef_gpio_chip->gc.of_gpio_n_cells = 2;
- gef_gpio_chip->gc.ngpio = 19;
- gef_gpio_chip->gc.direction_input = gef_gpio_dir_in;
- gef_gpio_chip->gc.direction_output = gef_gpio_dir_out;
- gef_gpio_chip->gc.get = gef_gpio_get;
- gef_gpio_chip->gc.set = gef_gpio_set;
-
- /* This function adds a memory mapped GPIO chip */
- retval = of_mm_gpiochip_add(np, gef_gpio_chip);
- if (retval) {
- kfree(gef_gpio_chip);
- pr_err("%s: Unable to add GPIO\n", np->full_name);
- }
- }
-
- for_each_compatible_node(np, NULL, "gef,sbc310-gpio") {
-
- pr_debug("%s: Initialising GEF GPIO\n", np->full_name);
-
- /* Allocate chip structure */
- gef_gpio_chip = kzalloc(sizeof(*gef_gpio_chip), GFP_KERNEL);
- if (!gef_gpio_chip) {
- pr_err("%s: Unable to allocate structure\n",
- np->full_name);
- continue;
- }
-
- /* Setup pointers to chip functions */
- gef_gpio_chip->gc.of_gpio_n_cells = 2;
- gef_gpio_chip->gc.ngpio = 6;
- gef_gpio_chip->gc.direction_input = gef_gpio_dir_in;
- gef_gpio_chip->gc.direction_output = gef_gpio_dir_out;
- gef_gpio_chip->gc.get = gef_gpio_get;
- gef_gpio_chip->gc.set = gef_gpio_set;
-
- /* This function adds a memory mapped GPIO chip */
- retval = of_mm_gpiochip_add(np, gef_gpio_chip);
- if (retval) {
- kfree(gef_gpio_chip);
- pr_err("%s: Unable to add GPIO\n", np->full_name);
- }
- }
-
- for_each_compatible_node(np, NULL, "ge,imp3a-gpio") {
-
- pr_debug("%s: Initialising GE GPIO\n", np->full_name);
-
- /* Allocate chip structure */
- gef_gpio_chip = kzalloc(sizeof(*gef_gpio_chip), GFP_KERNEL);
- if (!gef_gpio_chip) {
- pr_err("%s: Unable to allocate structure\n",
- np->full_name);
- continue;
- }
-
- /* Setup pointers to chip functions */
- gef_gpio_chip->gc.of_gpio_n_cells = 2;
- gef_gpio_chip->gc.ngpio = 16;
- gef_gpio_chip->gc.direction_input = gef_gpio_dir_in;
- gef_gpio_chip->gc.direction_output = gef_gpio_dir_out;
- gef_gpio_chip->gc.get = gef_gpio_get;
- gef_gpio_chip->gc.set = gef_gpio_set;
-
- /* This function adds a memory mapped GPIO chip */
- retval = of_mm_gpiochip_add(np, gef_gpio_chip);
- if (retval) {
- kfree(gef_gpio_chip);
- pr_err("%s: Unable to add GPIO\n", np->full_name);
- }
- }
+ const struct of_device_id *of_id =
+ of_match_device(gef_gpio_ids, &pdev->dev);
+ struct of_mm_gpio_chip *mmchip;
+
+ mmchip = devm_kzalloc(&pdev->dev, sizeof(*mmchip), GFP_KERNEL);
+ if (!mmchip)
+ return -ENOMEM;
+
+ /* 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;
+
+ /* This function adds a memory mapped GPIO chip */
+ return of_mm_gpiochip_add(pdev->dev.of_node, mmchip);
+};
- return 0;
+static struct platform_driver gef_gpio_driver = {
+ .driver = {
+ .name = "gef-gpio",
+ .owner = THIS_MODULE,
+ .of_match_table = gef_gpio_ids,
+ },
};
-arch_initcall(gef_gpio_init);
+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");
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-12 15:40:13 +0000