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Subject[PATCH V2 2/4] misc/pvpanic: add MMIO support
Date
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.

Signed-off-by: Peng Hao <peng.hao2@zte.com.cn>
---
drivers/misc/pvpanic.c | 18 ++++++++++++++++--
1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/drivers/misc/pvpanic.c b/drivers/misc/pvpanic.c
index fd86dab..bcfefdd 100644
--- a/drivers/misc/pvpanic.c
+++ b/drivers/misc/pvpanic.c
@@ -43,6 +43,8 @@

static u16 port;

+static void __iomem *base;
+
static struct acpi_driver pvpanic_driver = {
.name = "pvpanic",
.class = "QEMU",
@@ -57,7 +59,10 @@
static void
pvpanic_send_event(unsigned int event)
{
- outb(event, port);
+ if (port)
+ outb(event, port);
+ else if (base)
+ writeb(event, base);
}

static int
@@ -77,6 +82,8 @@
static acpi_status
pvpanic_walk_resources(struct acpi_resource *res, void *context)
{
+ struct acpi_resource_fixed_memory32 *fixmem32;
+
switch (res->type) {
case ACPI_RESOURCE_TYPE_END_TAG:
return AE_OK;
@@ -85,6 +92,11 @@
port = res->data.io.minimum;
return AE_OK;

+ case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
+ fixmem32 = &res->data.fixed_memory32;
+ base = ioremap(fixmem32->address, fixmem32->address_length);
+ return AE_OK;
+
default:
return AE_ERROR;
}
@@ -104,7 +116,7 @@ static int pvpanic_add(struct acpi_device *device)
acpi_walk_resources(device->handle, METHOD_NAME__CRS,
pvpanic_walk_resources, NULL);

- if (!port)
+ if (!port && !base)
return -ENODEV;

atomic_notifier_chain_register(&panic_notifier_list,
@@ -118,6 +130,8 @@ static int pvpanic_remove(struct acpi_device *device)

atomic_notifier_chain_unregister(&panic_notifier_list,
&pvpanic_panic_nb);
+ if (base)
+ iounmap(base);
return 0;
}

--
1.8.3.1
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