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[v4,1/9] kernel/resource: Introduce request_mem_region_muxed()

Message ID 20220130184130.176646-2-terry.bowman@amd.com
State Superseded
Headers show
Series i2c: piix4: Replace cd6h/cd7h port I/O accesses with MMIO accesses | expand

Commit Message

Terry Bowman Jan. 30, 2022, 6:41 p.m. UTC 
Support for requesting muxed memory region is implemented but not
currently callable as a macro. Add the request muxed memory
region macro.

MMIO memory accesses can be synchronized using request_mem_region() which
is already available. This call will return failure if the resource is
busy. The 'muxed' version of this macro will handle a busy resource by
using a wait queue to retry until the resource is available.

Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Terry Bowman <terry.bowman@amd.com>
---
 include/linux/ioport.h | 2 ++
 1 file changed, 2 insertions(+)
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Patch

diff --git a/include/linux/ioport.h b/include/linux/ioport.h
index 8359c50f9988..ec5f71f7135b 100644
--- a/include/linux/ioport.h
+++ b/include/linux/ioport.h
@@ -262,6 +262,8 @@  resource_union(struct resource *r1, struct resource *r2, struct resource *r)
 #define request_muxed_region(start,n,name)	__request_region(&ioport_resource, (start), (n), (name), IORESOURCE_MUXED)
 #define __request_mem_region(start,n,name, excl) __request_region(&iomem_resource, (start), (n), (name), excl)
 #define request_mem_region(start,n,name) __request_region(&iomem_resource, (start), (n), (name), 0)
+#define request_mem_region_muxed(start, n, name) \
+	__request_region(&iomem_resource, (start), (n), (name), IORESOURCE_MUXED)
 #define request_mem_region_exclusive(start,n,name) \
 	__request_region(&iomem_resource, (start), (n), (name), IORESOURCE_EXCLUSIVE)
 #define rename_region(region, newname) do { (region)->name = (newname); } while (0)