From ca2e334232b6cd4ae5af9da2df83c009d042aefb Mon Sep 17 00:00:00 2001
From: Johannes Berg <johannes.berg@intel.com>
Date: Fri, 5 Mar 2021 13:19:52 +0100
Subject: lib: add iomem emulation (logic_iomem)

Add IO memory emulation that uses callbacks for read/write to
the allocated regions. The callbacks can be registered by the
users using logic_iomem_alloc().

To use, an architecture must 'select LOGIC_IOMEM' in Kconfig
and then include <asm-generic/logic_io.h> into asm/io.h to get
the __raw_read*/__raw_write* functions.

Optionally, an architecture may 'select LOGIC_IOMEM_FALLBACK'
in which case non-emulated regions will 'fall back' to the
various real_* functions that must then be provided.

Cc: Arnd Bergmann <arnd@kernel.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
---
 lib/Makefile | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'lib/Makefile')

diff --git a/lib/Makefile b/lib/Makefile
index 2cc359ec1fdd..fc38a55e6fe4 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -147,6 +147,8 @@ obj-$(CONFIG_DEBUG_LOCKING_API_SELFTESTS) += locking-selftest.o
 
 lib-y += logic_pio.o
 
+lib-$(CONFIG_INDIRECT_IOMEM) += logic_iomem.o
+
 obj-$(CONFIG_GENERIC_HWEIGHT) += hweight.o
 
 obj-$(CONFIG_BTREE) += btree.o
-- 
cgit