197 lines
3.9 KiB
C
197 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Pvpanic Device Support
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*
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* Copyright (C) 2013 Fujitsu.
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* Copyright (C) 2018 ZTE.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/acpi.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/platform_device.h>
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#include <linux/types.h>
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static void __iomem *base;
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#define PVPANIC_PANICKED (1 << 0)
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MODULE_AUTHOR("Hu Tao <hutao@cn.fujitsu.com>");
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MODULE_DESCRIPTION("pvpanic device driver");
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MODULE_LICENSE("GPL");
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static void
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pvpanic_send_event(unsigned int event)
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{
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iowrite8(event, base);
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}
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static int
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pvpanic_panic_notify(struct notifier_block *nb, unsigned long code,
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void *unused)
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{
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pvpanic_send_event(PVPANIC_PANICKED);
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return NOTIFY_DONE;
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}
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static struct notifier_block pvpanic_panic_nb = {
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.notifier_call = pvpanic_panic_notify,
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.priority = 1, /* let this called before broken drm_fb_helper */
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};
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#ifdef CONFIG_ACPI
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static int pvpanic_add(struct acpi_device *device);
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static int pvpanic_remove(struct acpi_device *device);
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static const struct acpi_device_id pvpanic_device_ids[] = {
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{ "QEMU0001", 0 },
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{ "", 0 }
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};
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MODULE_DEVICE_TABLE(acpi, pvpanic_device_ids);
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static struct acpi_driver pvpanic_driver = {
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.name = "pvpanic",
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.class = "QEMU",
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.ids = pvpanic_device_ids,
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.ops = {
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.add = pvpanic_add,
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.remove = pvpanic_remove,
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},
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.owner = THIS_MODULE,
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};
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static acpi_status
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pvpanic_walk_resources(struct acpi_resource *res, void *context)
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{
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struct resource r;
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if (acpi_dev_resource_io(res, &r)) {
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#ifdef CONFIG_HAS_IOPORT_MAP
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base = ioport_map(r.start, resource_size(&r));
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return AE_OK;
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#else
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return AE_ERROR;
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#endif
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} else if (acpi_dev_resource_memory(res, &r)) {
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base = ioremap(r.start, resource_size(&r));
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return AE_OK;
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}
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return AE_ERROR;
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}
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static int pvpanic_add(struct acpi_device *device)
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{
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int ret;
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ret = acpi_bus_get_status(device);
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if (ret < 0)
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return ret;
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if (!device->status.enabled || !device->status.functional)
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return -ENODEV;
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acpi_walk_resources(device->handle, METHOD_NAME__CRS,
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pvpanic_walk_resources, NULL);
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if (!base)
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return -ENODEV;
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atomic_notifier_chain_register(&panic_notifier_list,
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&pvpanic_panic_nb);
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return 0;
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}
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static int pvpanic_remove(struct acpi_device *device)
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{
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atomic_notifier_chain_unregister(&panic_notifier_list,
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&pvpanic_panic_nb);
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iounmap(base);
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return 0;
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}
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static int pvpanic_register_acpi_driver(void)
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{
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return acpi_bus_register_driver(&pvpanic_driver);
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}
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static void pvpanic_unregister_acpi_driver(void)
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{
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acpi_bus_unregister_driver(&pvpanic_driver);
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}
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#else
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static int pvpanic_register_acpi_driver(void)
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{
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return -ENODEV;
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}
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static void pvpanic_unregister_acpi_driver(void) {}
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#endif
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static int pvpanic_mmio_probe(struct platform_device *pdev)
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{
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struct resource *mem;
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mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!mem)
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return -EINVAL;
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base = devm_ioremap_resource(&pdev->dev, mem);
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if (IS_ERR(base))
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return PTR_ERR(base);
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atomic_notifier_chain_register(&panic_notifier_list,
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&pvpanic_panic_nb);
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return 0;
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}
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static int pvpanic_mmio_remove(struct platform_device *pdev)
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{
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atomic_notifier_chain_unregister(&panic_notifier_list,
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&pvpanic_panic_nb);
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return 0;
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}
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static const struct of_device_id pvpanic_mmio_match[] = {
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{ .compatible = "qemu,pvpanic-mmio", },
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{}
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};
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static struct platform_driver pvpanic_mmio_driver = {
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.driver = {
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.name = "pvpanic-mmio",
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.of_match_table = pvpanic_mmio_match,
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},
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.probe = pvpanic_mmio_probe,
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.remove = pvpanic_mmio_remove,
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};
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static int __init pvpanic_mmio_init(void)
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{
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if (acpi_disabled)
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return platform_driver_register(&pvpanic_mmio_driver);
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else
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return pvpanic_register_acpi_driver();
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}
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static void __exit pvpanic_mmio_exit(void)
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{
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if (acpi_disabled)
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platform_driver_unregister(&pvpanic_mmio_driver);
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else
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pvpanic_unregister_acpi_driver();
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}
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module_init(pvpanic_mmio_init);
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module_exit(pvpanic_mmio_exit);
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