[linux.git] / drivers / gpio / gpio-mlxbf.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");
Commit	Line	Data
c78c42d7 SKR	1	// SPDX-License-Identifier: GPL-2.0
	2
	3	#include <linux/acpi.h>
	4	#include <linux/bitops.h>
	5	#include <linux/device.h>
	6	#include <linux/gpio/driver.h>
	7	#include <linux/io.h>
	8	#include <linux/kernel.h>
	9	#include <linux/module.h>
	10	#include <linux/platform_device.h>
	11	#include <linux/pm.h>
	12	#include <linux/resource.h>
	13	#include <linux/types.h>
c78c42d7 SKR	14
	15	/* Number of pins on BlueField */
	16	#define MLXBF_GPIO_NR 54
	17
	18	/* Pad Electrical Controls. */
	19	#define MLXBF_GPIO_PAD_CONTROL_FIRST_WORD 0x0700
	20	#define MLXBF_GPIO_PAD_CONTROL_1_FIRST_WORD 0x0708
	21	#define MLXBF_GPIO_PAD_CONTROL_2_FIRST_WORD 0x0710
	22	#define MLXBF_GPIO_PAD_CONTROL_3_FIRST_WORD 0x0718
	23
	24	#define MLXBF_GPIO_PIN_DIR_I 0x1040
	25	#define MLXBF_GPIO_PIN_DIR_O 0x1048
	26	#define MLXBF_GPIO_PIN_STATE 0x1000
	27	#define MLXBF_GPIO_SCRATCHPAD 0x20
	28
	29	#ifdef CONFIG_PM
	30	struct mlxbf_gpio_context_save_regs {
	31	u64 scratchpad;
	32	u64 pad_control[MLXBF_GPIO_NR];
	33	u64 pin_dir_i;
	34	u64 pin_dir_o;
	35	};
	36	#endif
	37
	38	/* Device state structure. */
	39	struct mlxbf_gpio_state {
	40	struct gpio_chip gc;
	41
	42	/* Memory Address */
	43	void __iomem *base;
	44
	45	#ifdef CONFIG_PM
	46	struct mlxbf_gpio_context_save_regs csave_regs;
	47	#endif
	48	};
	49
	50	static int mlxbf_gpio_probe(struct platform_device *pdev)
	51	{
	52	struct mlxbf_gpio_state *gs;
	53	struct device *dev = &pdev->dev;
	54	struct gpio_chip *gc;
	55	int ret;
	56
	57	gs = devm_kzalloc(&pdev->dev, sizeof(*gs), GFP_KERNEL);
	58	if (!gs)
	59	return -ENOMEM;
	60
	61	gs->base = devm_platform_ioremap_resource(pdev, 0);
	62	if (IS_ERR(gs->base))
	63	return PTR_ERR(gs->base);
	64
	65	gc = &gs->gc;
	66	ret = bgpio_init(gc, dev, 8,
	67	gs->base + MLXBF_GPIO_PIN_STATE,
	68	NULL,
	69	NULL,
	70	gs->base + MLXBF_GPIO_PIN_DIR_O,
	71	gs->base + MLXBF_GPIO_PIN_DIR_I,
	72	0);
	73	if (ret)
	74	return -ENODEV;
	75
	76	gc->owner = THIS_MODULE;
	77	gc->ngpio = MLXBF_GPIO_NR;
78
79	ret = devm_gpiochip_add_data(dev, &gs->gc, gs);
80	if (ret) {
81	dev_err(&pdev->dev, "Failed adding memory mapped gpiochip\n");
82	return ret;
83	}
84
85	platform_set_drvdata(pdev, gs);
86	dev_info(&pdev->dev, "registered Mellanox BlueField GPIO");
87	return 0;
88	}
89
90	#ifdef CONFIG_PM
91	static int mlxbf_gpio_suspend(struct platform_device *pdev, pm_message_t state)
92	{
93	struct mlxbf_gpio_state *gs = platform_get_drvdata(pdev);
94
95	gs->csave_regs.scratchpad = readq(gs->base + MLXBF_GPIO_SCRATCHPAD);
96	gs->csave_regs.pad_control[0] =
97	readq(gs->base + MLXBF_GPIO_PAD_CONTROL_FIRST_WORD);
98	gs->csave_regs.pad_control[1] =
99	readq(gs->base + MLXBF_GPIO_PAD_CONTROL_1_FIRST_WORD);
100	gs->csave_regs.pad_control[2] =
101	readq(gs->base + MLXBF_GPIO_PAD_CONTROL_2_FIRST_WORD);
102	gs->csave_regs.pad_control[3] =
103	readq(gs->base + MLXBF_GPIO_PAD_CONTROL_3_FIRST_WORD);
104	gs->csave_regs.pin_dir_i = readq(gs->base + MLXBF_GPIO_PIN_DIR_I);
105	gs->csave_regs.pin_dir_o = readq(gs->base + MLXBF_GPIO_PIN_DIR_O);
106
107	return 0;
108	}
109
110	static int mlxbf_gpio_resume(struct platform_device *pdev)
111	{
112	struct mlxbf_gpio_state *gs = platform_get_drvdata(pdev);
113
114	writeq(gs->csave_regs.scratchpad, gs->base + MLXBF_GPIO_SCRATCHPAD);
115	writeq(gs->csave_regs.pad_control[0],
116	gs->base + MLXBF_GPIO_PAD_CONTROL_FIRST_WORD);
117	writeq(gs->csave_regs.pad_control[1],
118	gs->base + MLXBF_GPIO_PAD_CONTROL_1_FIRST_WORD);
119	writeq(gs->csave_regs.pad_control[2],
120	gs->base + MLXBF_GPIO_PAD_CONTROL_2_FIRST_WORD);
121	writeq(gs->csave_regs.pad_control[3],
122	gs->base + MLXBF_GPIO_PAD_CONTROL_3_FIRST_WORD);
123	writeq(gs->csave_regs.pin_dir_i, gs->base + MLXBF_GPIO_PIN_DIR_I);
124	writeq(gs->csave_regs.pin_dir_o, gs->base + MLXBF_GPIO_PIN_DIR_O);
125
126	return 0;
127	}
128	#endif
129
6ac2de95	130	static const struct acpi_device_id __maybe_unused mlxbf_gpio_acpi_match[] = {
c78c42d7 SKR	131	{ "MLNXBF02", 0 },
	132	{}
	133	};
	134	MODULE_DEVICE_TABLE(acpi, mlxbf_gpio_acpi_match);
	135
	136	static struct platform_driver mlxbf_gpio_driver = {
	137	.driver = {
	138	.name = "mlxbf_gpio",
	139	.acpi_match_table = ACPI_PTR(mlxbf_gpio_acpi_match),
	140	},
	141	.probe = mlxbf_gpio_probe,
	142	#ifdef CONFIG_PM
	143	.suspend = mlxbf_gpio_suspend,
	144	.resume = mlxbf_gpio_resume,
	145	#endif
	146	};
	147
	148	module_platform_driver(mlxbf_gpio_driver);
	149
	150	MODULE_DESCRIPTION("Mellanox BlueField GPIO Driver");
	151	MODULE_AUTHOR("Mellanox Technologies");
	152	MODULE_LICENSE("GPL");