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| author |   Peng Hao <peng.hao2@zte.com.cn> | 2018-11-06 22:57:14 +0800 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-11-07 13:53:04 +0100 |
| commit | 725eba2928ada8d0fe6bafb984e37576851edc91 (patch) | |
| tree | c4c98d5428d3b392c45dee74f07aa25b0f576845 /drivers/misc/pvpanic.c | |
| parent | misc/pvpanic: simplify the code using acpi_dev_resource_io (diff) | |
| download | linux-dev-725eba2928ada8d0fe6bafb984e37576851edc91.tar.xz linux-dev-725eba2928ada8d0fe6bafb984e37576851edc91.zip | |
misc/pvpanic: add MMIO support
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>
Diffstat (limited to 'drivers/misc/pvpanic.c')
| -rw-r--r-- | drivers/misc/pvpanic.c | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/drivers/misc/pvpanic.c b/drivers/misc/pvpanic.c index 49c59e1d299d..a46701c22b35 100644 --- a/drivers/misc/pvpanic.c +++ b/drivers/misc/pvpanic.c @@ -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; } |