[linux-2.6-block.git] / drivers / misc / pvpanic.c

// SPDX-License-Identifier: GPL-2.0+
/*
 *  Pvpanic Device Support
 *
 *  Copyright (C) 2013 Fujitsu.
 *  Copyright (C) 2018 ZTE.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/acpi.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/types.h>

static void __iomem *base;

#define PVPANIC_PANICKED        (1 << 0)

MODULE_AUTHOR("Hu Tao <hutao@cn.fujitsu.com>");
MODULE_DESCRIPTION("pvpanic device driver");
MODULE_LICENSE("GPL");

static void
pvpanic_send_event(unsigned int event)
{
	iowrite8(event, base);
}

static int
pvpanic_panic_notify(struct notifier_block *nb, unsigned long code,
		     void *unused)
{
	pvpanic_send_event(PVPANIC_PANICKED);
	return NOTIFY_DONE;
}

static struct notifier_block pvpanic_panic_nb = {
	.notifier_call = pvpanic_panic_notify,
	.priority = 1, /* let this called before broken drm_fb_helper */
};

#ifdef CONFIG_ACPI
static int pvpanic_add(struct acpi_device *device);
static int pvpanic_remove(struct acpi_device *device);

static const struct acpi_device_id pvpanic_device_ids[] = {
	{ "QEMU0001", 0 },
	{ "", 0 }
};
MODULE_DEVICE_TABLE(acpi, pvpanic_device_ids);

static struct acpi_driver pvpanic_driver = {
	.name =		"pvpanic",
	.class =	"QEMU",
	.ids =		pvpanic_device_ids,
	.ops =		{
				.add =		pvpanic_add,
				.remove =	pvpanic_remove,
			},
	.owner =	THIS_MODULE,
};

static acpi_status
pvpanic_walk_resources(struct acpi_resource *res, void *context)
{
	struct resource r;

	if (acpi_dev_resource_io(res, &r)) {
#ifdef CONFIG_HAS_IOPORT_MAP
		base = ioport_map(r.start, resource_size(&r));
		return AE_OK;
#else
		return AE_ERROR;
#endif
	} else if (acpi_dev_resource_memory(res, &r)) {
		base = ioremap(r.start, resource_size(&r));
		return AE_OK;
	}

	return AE_ERROR;
}

static int pvpanic_add(struct acpi_device *device)
{
	int ret;

	ret = acpi_bus_get_status(device);
	if (ret < 0)
		return ret;

	if (!device->status.enabled || !device->status.functional)
		return -ENODEV;

	acpi_walk_resources(device->handle, METHOD_NAME__CRS,
			    pvpanic_walk_resources, NULL);

	if (!base)
		return -ENODEV;

	atomic_notifier_chain_register(&panic_notifier_list,
				       &pvpanic_panic_nb);

	return 0;
}

static int pvpanic_remove(struct acpi_device *device)
{

	atomic_notifier_chain_unregister(&panic_notifier_list,
					 &pvpanic_panic_nb);
	iounmap(base);

	return 0;
}

static int pvpanic_register_acpi_driver(void)
{
	return acpi_bus_register_driver(&pvpanic_driver);
}

static void pvpanic_unregister_acpi_driver(void)
{
	acpi_bus_unregister_driver(&pvpanic_driver);
}
#else
static int pvpanic_register_acpi_driver(void)
{
	return -ENODEV;
}

static void pvpanic_unregister_acpi_driver(void) {}
#endif

static int pvpanic_mmio_probe(struct platform_device *pdev)
{
	struct resource *mem;

	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!mem)
		return -EINVAL;

	base = devm_ioremap_resource(&pdev->dev, mem);
	if (IS_ERR(base))
		return PTR_ERR(base);

	atomic_notifier_chain_register(&panic_notifier_list,
				       &pvpanic_panic_nb);

	return 0;
}

static int pvpanic_mmio_remove(struct platform_device *pdev)
{

	atomic_notifier_chain_unregister(&panic_notifier_list,
					 &pvpanic_panic_nb);

	return 0;
}

static const struct of_device_id pvpanic_mmio_match[] = {
	{ .compatible = "qemu,pvpanic-mmio", },
	{}
};

static struct platform_driver pvpanic_mmio_driver = {
	.driver = {
		.name = "pvpanic-mmio",
		.of_match_table = pvpanic_mmio_match,
	},
	.probe = pvpanic_mmio_probe,
	.remove = pvpanic_mmio_remove,
};

static int __init pvpanic_mmio_init(void)
{
	if (acpi_disabled)
		return platform_driver_register(&pvpanic_mmio_driver);
	else
		return pvpanic_register_acpi_driver();
}

static void __exit pvpanic_mmio_exit(void)
{
	if (acpi_disabled)
		platform_driver_unregister(&pvpanic_mmio_driver);
	else
		pvpanic_unregister_acpi_driver();
}

module_init(pvpanic_mmio_init);
module_exit(pvpanic_mmio_exit);
Commit	Line	Data
7247932c	1	// SPDX-License-Identifier: GPL-2.0+
8b10acd7	2	/*
7247932c	3	* Pvpanic Device Support
8b10acd7 HT	4	*
8b10acd7 HT	5	* Copyright (C) 2013 Fujitsu.
46f934c9	6	* Copyright (C) 2018 ZTE.
8b10acd7 HT	7	*/
	8
	9	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
	10
8eeffed0	11	#include <linux/acpi.h>
8b10acd7 HT	12	#include <linux/kernel.h>
8b10acd7 HT	13	#include <linux/module.h>
46f934c9 PH	14	#include <linux/of.h>
	15	#include <linux/of_address.h>
	16	#include <linux/platform_device.h>
8b10acd7	17	#include <linux/types.h>
8b10acd7	18
725eba29 PH	19	static void __iomem *base;
725eba29 PH	20
a8b71d27 PH	21	#define PVPANIC_PANICKED (1 << 0)
a8b71d27 PH	22
8b10acd7 HT	23	MODULE_AUTHOR("Hu Tao <hutao@cn.fujitsu.com>");
	24	MODULE_DESCRIPTION("pvpanic device driver");
	25	MODULE_LICENSE("GPL");
	26
8b10acd7 HT	27	static void
	28	pvpanic_send_event(unsigned int event)
	29	{
725eba29	30	iowrite8(event, base);
8b10acd7 HT	31	}
	32
	33	static int
	34	pvpanic_panic_notify(struct notifier_block *nb, unsigned long code,
	35	void *unused)
	36	{
	37	pvpanic_send_event(PVPANIC_PANICKED);
	38	return NOTIFY_DONE;
	39	}
	40
	41	static struct notifier_block pvpanic_panic_nb = {
	42	.notifier_call = pvpanic_panic_notify,
7939831e	43	.priority = 1, /* let this called before broken drm_fb_helper */
8b10acd7 HT	44	};
8b10acd7 HT	45
77703e0b	46	#ifdef CONFIG_ACPI
a8b71d27 PH	47	static int pvpanic_add(struct acpi_device *device);
	48	static int pvpanic_remove(struct acpi_device *device);
	49
	50	static const struct acpi_device_id pvpanic_device_ids[] = {
	51	{ "QEMU0001", 0 },
78ef4193	52	{ "", 0 }
a8b71d27 PH	53	};
	54	MODULE_DEVICE_TABLE(acpi, pvpanic_device_ids);
	55
	56	static struct acpi_driver pvpanic_driver = {
	57	.name = "pvpanic",
	58	.class = "QEMU",
	59	.ids = pvpanic_device_ids,
	60	.ops = {
	61	.add = pvpanic_add,
	62	.remove = pvpanic_remove,
	63	},
	64	.owner = THIS_MODULE,
	65	};
8b10acd7 HT	66
	67	static acpi_status
	68	pvpanic_walk_resources(struct acpi_resource res, void context)
	69	{
d2ae1717	70	struct resource r;
8b10acd7	71
d2ae1717	72	if (acpi_dev_resource_io(res, &r)) {
d8e346eb	73	#ifdef CONFIG_HAS_IOPORT_MAP
725eba29 PH	74	base = ioport_map(r.start, resource_size(&r));
725eba29 PH	75	return AE_OK;
d8e346eb AR	76	#else
	77	return AE_ERROR;
	78	#endif
725eba29 PH	79	} else if (acpi_dev_resource_memory(res, &r)) {
725eba29 PH	80	base = ioremap(r.start, resource_size(&r));
8b10acd7	81	return AE_OK;
8b10acd7	82	}
d2ae1717 PH	83
d2ae1717 PH	84	return AE_ERROR;
8b10acd7 HT	85	}
	86
	87	static int pvpanic_add(struct acpi_device *device)
	88	{
55cd3f01	89	int ret;
8b10acd7	90
55cd3f01 RK	91	ret = acpi_bus_get_status(device);
	92	if (ret < 0)
	93	return ret;
8b10acd7	94
55cd3f01	95	if (!device->status.enabled \|\| !device->status.functional)
8b10acd7 HT	96	return -ENODEV;
	97
	98	acpi_walk_resources(device->handle, METHOD_NAME__CRS,
	99	pvpanic_walk_resources, NULL);
	100
725eba29	101	if (!base)
8b10acd7 HT	102	return -ENODEV;
	103
	104	atomic_notifier_chain_register(&panic_notifier_list,
	105	&pvpanic_panic_nb);
	106
	107	return 0;
	108	}
	109
	110	static int pvpanic_remove(struct acpi_device *device)
	111	{
	112
	113	atomic_notifier_chain_unregister(&panic_notifier_list,
	114	&pvpanic_panic_nb);
725eba29 PH	115	iounmap(base);
725eba29 PH	116
8b10acd7 HT	117	return 0;
	118	}
	119
77703e0b PH	120	static int pvpanic_register_acpi_driver(void)
	121	{
	122	return acpi_bus_register_driver(&pvpanic_driver);
	123	}
	124
	125	static void pvpanic_unregister_acpi_driver(void)
	126	{
	127	acpi_bus_unregister_driver(&pvpanic_driver);
	128	}
	129	#else
	130	static int pvpanic_register_acpi_driver(void)
	131	{
	132	return -ENODEV;
	133	}
	134
	135	static void pvpanic_unregister_acpi_driver(void) {}
	136	#endif
	137
46f934c9 PH	138	static int pvpanic_mmio_probe(struct platform_device *pdev)
	139	{
	140	struct resource *mem;
	141
	142	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	143	if (!mem)
	144	return -EINVAL;
	145
	146	base = devm_ioremap_resource(&pdev->dev, mem);
97a64ba7 DC	147	if (IS_ERR(base))
97a64ba7 DC	148	return PTR_ERR(base);
46f934c9 PH	149
	150	atomic_notifier_chain_register(&panic_notifier_list,
	151	&pvpanic_panic_nb);
	152
	153	return 0;
	154	}
	155
	156	static int pvpanic_mmio_remove(struct platform_device *pdev)
	157	{
	158
	159	atomic_notifier_chain_unregister(&panic_notifier_list,
	160	&pvpanic_panic_nb);
	161
	162	return 0;
	163	}
	164
	165	static const struct of_device_id pvpanic_mmio_match[] = {
	166	{ .compatible = "qemu,pvpanic-mmio", },
	167	{}
	168	};
	169
	170	static struct platform_driver pvpanic_mmio_driver = {
	171	.driver = {
	172	.name = "pvpanic-mmio",
	173	.of_match_table = pvpanic_mmio_match,
	174	},
	175	.probe = pvpanic_mmio_probe,
	176	.remove = pvpanic_mmio_remove,
	177	};
	178
	179	static int __init pvpanic_mmio_init(void)
	180	{
	181	if (acpi_disabled)
	182	return platform_driver_register(&pvpanic_mmio_driver);
	183	else
77703e0b	184	return pvpanic_register_acpi_driver();
46f934c9 PH	185	}
	186
	187	static void __exit pvpanic_mmio_exit(void)
	188	{
	189	if (acpi_disabled)
	190	platform_driver_unregister(&pvpanic_mmio_driver);
	191	else
77703e0b	192	pvpanic_unregister_acpi_driver();
46f934c9 PH	193	}
	194
	195	module_init(pvpanic_mmio_init);
	196	module_exit(pvpanic_mmio_exit);