From: Peng Hao <peng.hao2@zte.com.cn>
To: robh+dt@kernel.org, mark.rutland@arm.com, arnd@arndb.de,
gregkh@linuxfoundation.org, andy@infradead.org,
dvhart@infradead.org
Cc: linux-kernel@vger.kernel.org,
platform-driver-x86@vger.kernel.org, hutao@cn.fujitsu.com,
linux-doc@vger.kernel.org, Peng Hao <peng.hao2@zte.com.cn>
Subject: [PATCH V5 6/8] misc/pvpanic: add MMIO support
Date: Thu, 1 Nov 2018 23:10:00 +0800 [thread overview]
Message-ID: <1541085002-42993-6-git-send-email-peng.hao2@zte.com.cn> (raw)
In-Reply-To: <1541085002-42993-1-git-send-email-peng.hao2@zte.com.cn>
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, 13 insertions(+), 5 deletions(-)
diff --git a/drivers/misc/pvpanic.c b/drivers/misc/pvpanic.c
index c20fdff..c0b787e 100644
--- a/drivers/misc/pvpanic.c
+++ b/drivers/misc/pvpanic.c
@@ -28,7 +28,7 @@
#define PVPANIC_PANICKED (1 << 0)
-static u16 port;
+static void __iomem *base;
static struct acpi_driver pvpanic_driver = {
.name = "pvpanic",
@@ -44,7 +44,7 @@
static void
pvpanic_send_event(unsigned int event)
{
- outb(event, port);
+ iowrite8(event, base);
}
static int
@@ -66,8 +66,14 @@
{
struct resource r;
- if (acpi_dev_resource_io(res, &r) {
- port = r.start;
+ if (acpi_dev_resource_io(res, &r) ||
+ acpi_dev_resource_memory(res, &r)) {
+ if (r.flags & IORESOURCE_IO)
+ base = (void __iomem *) ioport_map(r.start,
+ r.end - r.start + 1);
+ else
+ base = ioremap(r.start, r.end - r.start + 1);
+
return AE_OK;
}
@@ -89,7 +95,7 @@ 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,
@@ -103,6 +109,8 @@ static int pvpanic_remove(struct acpi_device *device)
atomic_notifier_chain_unregister(&panic_notifier_list,
&pvpanic_panic_nb);
+
+ iounmap(base);
return 0;
}
--
1.8.3.1
next prev parent reply other threads:[~2018-11-01 6:59 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-01 15:09 [PATCH V5 1/8] pvpanic: move pvpanic to misc as common driver Peng Hao
2018-11-01 13:10 ` Andy Shevchenko
2018-11-01 15:09 ` [PATCH V5 2/8] misc/pvpanic: Remove one extra semicolon Peng Hao
2018-11-01 11:33 ` Mark Rutland
2018-11-01 13:38 ` Andy Shevchenko
2018-11-01 15:09 ` [PATCH V5 3/8] misc/pvpanic: revmove unnecessary header file Peng Hao
2018-11-01 11:34 ` Mark Rutland
2018-11-01 11:35 ` Mark Rutland
2018-11-01 13:41 ` Andy Shevchenko
2018-11-01 15:09 ` [PATCH V5 4/8] misc/pvpanic :convert to SPDX license tags Peng Hao
2018-11-01 11:39 ` Mark Rutland
2018-11-01 13:42 ` Andy Shevchenko
2018-11-01 15:09 ` [PATCH V5 5/8] misc/pvpanic: simplify the code using acpi_dev_resource_io Peng Hao
2018-11-01 13:44 ` Andy Shevchenko
2018-11-01 15:10 ` Peng Hao [this message]
2018-11-01 11:42 ` [PATCH V5 6/8] misc/pvpanic: add MMIO support Mark Rutland
2018-11-01 17:04 ` Andy Shevchenko
2018-11-01 15:10 ` [PATCH V5 7/8] misc/pvpanic: add support to get pvpanic device info by FDT Peng Hao
2018-11-01 11:47 ` Mark Rutland
2018-11-01 15:10 ` [PATCH V5 8/8] dt-bindings/misc/pvpanic :add document for pvpanic-mmio Peng Hao
2018-11-01 11:46 ` Mark Rutland
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