By default, when ACPI tables and FDT coexist for ARM64,
current kernel takes precedence over FDT to get device information.
This patch increases the way to get information through FDT.
Signed-off-by: Peng Hao <peng.h...@zte.com.cn>
---
drivers/misc/pvpanic.c | 69 +++++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 68 insertions(+), 1 deletion(-)
diff --git a/drivers/misc/pvpanic.c b/drivers/misc/pvpanic.c
index bcfefdd..e4b2b40 100644
--- a/drivers/misc/pvpanic.c
+++ b/drivers/misc/pvpanic.c
@@ -2,6 +2,7 @@
* pvpanic.c - pvpanic Device Support
*
* Copyright (C) 2013 Fujitsu.
+ * Copyright (C) 2018 ZTE.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@@ -25,6 +26,10 @@
#include <linux/init.h>
#include <linux/types.h>
#include <linux/acpi.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <asm/virt.h>
+#include <linux/platform_device.h>
MODULE_AUTHOR("Hu Tao <hu...@cn.fujitsu.com>");
MODULE_DESCRIPTION("pvpanic device driver");
@@ -78,6 +83,37 @@
.priority = 1, /* let this called before broken drm_fb_helper */
};
+static int pvpanic_mmio_probe(struct platform_device *pdev)
+{
+ struct resource *mem;
+
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!mem)
+ return -EINVAL;
+
+ if (!devm_request_mem_region(&pdev->dev, mem->start,
+ resource_size(mem), pdev->name))
+ return -EBUSY;
+
+ base = devm_ioremap(&pdev->dev, mem->start,
+ resource_size(mem));
+ if (base == NULL)
+ return -EFAULT;
+
+ 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 acpi_status
pvpanic_walk_resources(struct acpi_resource *res, void *context)
@@ -135,4 +171,35 @@ static int pvpanic_remove(struct acpi_device *device)
return 0;
}
-module_acpi_driver(pvpanic_driver);
+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 acpi_bus_register_driver(&pvpanic_driver);
+}
+
+static void __exit pvpanic_mmio_exit(void)
+{
+ if (acpi_disabled)
+ platform_driver_unregister(&pvpanic_mmio_driver);
+ else
+ acpi_bus_unregister_driver(&pvpanic_driver);
+}
+
+module_init(pvpanic_mmio_init);
+module_exit(pvpanic_mmio_exit);
--
1.8.3.1
