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misc/pvpanic: add MMIO support

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On some architectures (e.g. arm64), it's preferable to use MMIO, since
this can be used standalone. Add MMIO support to the pvpanic driver.

Suggested-by: Andy Shevchenko <andy.shevchenko@gmail.com>
[Use acpi_dev_resource_memory API. - Andy]
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Peng Hao <peng.hao2@zte.com.cn>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peng Hao 2018-11-06 22:57:14 +08:00 committed by Greg Kroah-Hartman
parent d2ae1717f3
commit 725eba2928
1 changed files with 10 additions and 5 deletions
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15
drivers/misc/pvpanic.c
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@ -26,6 +26,8 @@
#include <linux/types.h>
#include <linux/acpi.h>
static void __iomem *base;
MODULE_AUTHOR("Hu Tao <hutao@cn.fujitsu.com>");
MODULE_DESCRIPTION("pvpanic device driver");
MODULE_LICENSE("GPL");
@ -41,8 +43,6 @@ MODULE_DEVICE_TABLE(acpi, pvpanic_device_ids);
#define PVPANIC_PANICKED (1 << 0)
static u16 port;
static struct acpi_driver pvpanic_driver = {
.name = "pvpanic",
.class = "QEMU",
@ -57,7 +57,7 @@ static struct acpi_driver pvpanic_driver = {
static void
pvpanic_send_event(unsigned int event)
{
outb(event, port);
iowrite8(event, base);
}
static int
@ -80,7 +80,10 @@ pvpanic_walk_resources(struct acpi_resource *res, void *context)
struct resource r;
if (acpi_dev_resource_io(res, &r)) {
port = r.start;
base = ioport_map(r.start, resource_size(&r));
return AE_OK;
} else if (acpi_dev_resource_memory(res, &r)) {
base = ioremap(r.start, resource_size(&r));
return AE_OK;
}
@ -101,7 +104,7 @@ static int pvpanic_add(struct acpi_device *device)
acpi_walk_resources(device->handle, METHOD_NAME__CRS,
pvpanic_walk_resources, NULL);
if (!port)
if (!base)
return -ENODEV;
atomic_notifier_chain_register(&panic_notifier_list,
@ -115,6 +118,8 @@ static int pvpanic_remove(struct acpi_device *device)
atomic_notifier_chain_unregister(&panic_notifier_list,
&pvpanic_panic_nb);
iounmap(base);
return 0;
}