mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-15 00:04:15 +08:00
6ac2de953b
... as is the case when !CONFIG_ACPI.
Fixes the following W=1 kernel build warning:
drivers/gpio/gpio-mlxbf.c:130:36: warning: ‘mlxbf_gpio_acpi_match’ defined but not used [-Wunused-const-variable=]
130 | static const struct acpi_device_id mlxbf_gpio_acpi_match[] = {
| ^~~~~~~~~~~~~~~~~~~~~
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Cc: Shravan Kumar Ramani <sramani@mellanox.com>
Link: https://lore.kernel.org/r/20200630133345.2232932-9-lee.jones@linaro.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
153 lines
3.9 KiB
C
153 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
|
|
#include <linux/acpi.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/device.h>
|
|
#include <linux/gpio/driver.h>
|
|
#include <linux/io.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/pm.h>
|
|
#include <linux/resource.h>
|
|
#include <linux/types.h>
|
|
|
|
/* Number of pins on BlueField */
|
|
#define MLXBF_GPIO_NR 54
|
|
|
|
/* Pad Electrical Controls. */
|
|
#define MLXBF_GPIO_PAD_CONTROL_FIRST_WORD 0x0700
|
|
#define MLXBF_GPIO_PAD_CONTROL_1_FIRST_WORD 0x0708
|
|
#define MLXBF_GPIO_PAD_CONTROL_2_FIRST_WORD 0x0710
|
|
#define MLXBF_GPIO_PAD_CONTROL_3_FIRST_WORD 0x0718
|
|
|
|
#define MLXBF_GPIO_PIN_DIR_I 0x1040
|
|
#define MLXBF_GPIO_PIN_DIR_O 0x1048
|
|
#define MLXBF_GPIO_PIN_STATE 0x1000
|
|
#define MLXBF_GPIO_SCRATCHPAD 0x20
|
|
|
|
#ifdef CONFIG_PM
|
|
struct mlxbf_gpio_context_save_regs {
|
|
u64 scratchpad;
|
|
u64 pad_control[MLXBF_GPIO_NR];
|
|
u64 pin_dir_i;
|
|
u64 pin_dir_o;
|
|
};
|
|
#endif
|
|
|
|
/* Device state structure. */
|
|
struct mlxbf_gpio_state {
|
|
struct gpio_chip gc;
|
|
|
|
/* Memory Address */
|
|
void __iomem *base;
|
|
|
|
#ifdef CONFIG_PM
|
|
struct mlxbf_gpio_context_save_regs csave_regs;
|
|
#endif
|
|
};
|
|
|
|
static int mlxbf_gpio_probe(struct platform_device *pdev)
|
|
{
|
|
struct mlxbf_gpio_state *gs;
|
|
struct device *dev = &pdev->dev;
|
|
struct gpio_chip *gc;
|
|
int ret;
|
|
|
|
gs = devm_kzalloc(&pdev->dev, sizeof(*gs), GFP_KERNEL);
|
|
if (!gs)
|
|
return -ENOMEM;
|
|
|
|
gs->base = devm_platform_ioremap_resource(pdev, 0);
|
|
if (IS_ERR(gs->base))
|
|
return PTR_ERR(gs->base);
|
|
|
|
gc = &gs->gc;
|
|
ret = bgpio_init(gc, dev, 8,
|
|
gs->base + MLXBF_GPIO_PIN_STATE,
|
|
NULL,
|
|
NULL,
|
|
gs->base + MLXBF_GPIO_PIN_DIR_O,
|
|
gs->base + MLXBF_GPIO_PIN_DIR_I,
|
|
0);
|
|
if (ret)
|
|
return -ENODEV;
|
|
|
|
gc->owner = THIS_MODULE;
|
|
gc->ngpio = MLXBF_GPIO_NR;
|
|
|
|
ret = devm_gpiochip_add_data(dev, &gs->gc, gs);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "Failed adding memory mapped gpiochip\n");
|
|
return ret;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, gs);
|
|
dev_info(&pdev->dev, "registered Mellanox BlueField GPIO");
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
static int mlxbf_gpio_suspend(struct platform_device *pdev, pm_message_t state)
|
|
{
|
|
struct mlxbf_gpio_state *gs = platform_get_drvdata(pdev);
|
|
|
|
gs->csave_regs.scratchpad = readq(gs->base + MLXBF_GPIO_SCRATCHPAD);
|
|
gs->csave_regs.pad_control[0] =
|
|
readq(gs->base + MLXBF_GPIO_PAD_CONTROL_FIRST_WORD);
|
|
gs->csave_regs.pad_control[1] =
|
|
readq(gs->base + MLXBF_GPIO_PAD_CONTROL_1_FIRST_WORD);
|
|
gs->csave_regs.pad_control[2] =
|
|
readq(gs->base + MLXBF_GPIO_PAD_CONTROL_2_FIRST_WORD);
|
|
gs->csave_regs.pad_control[3] =
|
|
readq(gs->base + MLXBF_GPIO_PAD_CONTROL_3_FIRST_WORD);
|
|
gs->csave_regs.pin_dir_i = readq(gs->base + MLXBF_GPIO_PIN_DIR_I);
|
|
gs->csave_regs.pin_dir_o = readq(gs->base + MLXBF_GPIO_PIN_DIR_O);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mlxbf_gpio_resume(struct platform_device *pdev)
|
|
{
|
|
struct mlxbf_gpio_state *gs = platform_get_drvdata(pdev);
|
|
|
|
writeq(gs->csave_regs.scratchpad, gs->base + MLXBF_GPIO_SCRATCHPAD);
|
|
writeq(gs->csave_regs.pad_control[0],
|
|
gs->base + MLXBF_GPIO_PAD_CONTROL_FIRST_WORD);
|
|
writeq(gs->csave_regs.pad_control[1],
|
|
gs->base + MLXBF_GPIO_PAD_CONTROL_1_FIRST_WORD);
|
|
writeq(gs->csave_regs.pad_control[2],
|
|
gs->base + MLXBF_GPIO_PAD_CONTROL_2_FIRST_WORD);
|
|
writeq(gs->csave_regs.pad_control[3],
|
|
gs->base + MLXBF_GPIO_PAD_CONTROL_3_FIRST_WORD);
|
|
writeq(gs->csave_regs.pin_dir_i, gs->base + MLXBF_GPIO_PIN_DIR_I);
|
|
writeq(gs->csave_regs.pin_dir_o, gs->base + MLXBF_GPIO_PIN_DIR_O);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static const struct acpi_device_id __maybe_unused mlxbf_gpio_acpi_match[] = {
|
|
{ "MLNXBF02", 0 },
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(acpi, mlxbf_gpio_acpi_match);
|
|
|
|
static struct platform_driver mlxbf_gpio_driver = {
|
|
.driver = {
|
|
.name = "mlxbf_gpio",
|
|
.acpi_match_table = ACPI_PTR(mlxbf_gpio_acpi_match),
|
|
},
|
|
.probe = mlxbf_gpio_probe,
|
|
#ifdef CONFIG_PM
|
|
.suspend = mlxbf_gpio_suspend,
|
|
.resume = mlxbf_gpio_resume,
|
|
#endif
|
|
};
|
|
|
|
module_platform_driver(mlxbf_gpio_driver);
|
|
|
|
MODULE_DESCRIPTION("Mellanox BlueField GPIO Driver");
|
|
MODULE_AUTHOR("Mellanox Technologies");
|
|
MODULE_LICENSE("GPL");
|