libpayload: Expand setbits_le32() and fix readl() const-ness

setbits_le32() is not really arch-specific... the arch-specific part of
accessing memory is wrapped by readl() and writel(), and the endianness
can be accounted for with the right macros. Generalize the definitions,
add a be32 version and move them to endian.h so that all platforms can
use them. Also include endian.h from libpayload.h so we won't update any
payload's old use of the macros (endianness is something useful enough
to always have avalable anyway, and shouldn't clash with other things).
This also fixes a bug where these macros would only be available if
libpayload-config.h had been independently included before.

Also fix a bug with readl() macros on all archs where they refused to
work on const pointers (which they should).

CQ-DEPEND=CL:208712
BUG=None
TEST=Stuff still compiles. Built and booted on Storm.

Original-Change-Id: I01a7fbadbb5d740675657d95c1e969027562ba8c
Original-Signed-off-by: Julius Werner <jwerner@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/208713
Original-Reviewed-by: Vadim Bendebury <vbendeb@chromium.org>
Original-Reviewed-by: David Hendricks <dhendrix@chromium.org>
(cherry picked from commit 951f8a6d77bc21bd793bf4f228a0965ade586f00)
Signed-off-by: Marc Jones <marc.jones@se-eng.com>

Change-Id: I51c25f01b200b91abbe32c879905349bb05dc9c8
Reviewed-on: http://review.coreboot.org/8129
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins)

1 files changed, 6 insertions, 6 deletions

diff --git a/payloads/libpayload/include/arm64/arch/io.h b/payloads/libpayload/include/arm64/arch/io.h
index 8948e133ef..df3a0d51ae 100644
--- a/payloads/libpayload/include/arm64/arch/io.h
+++ b/payloads/libpayload/include/arm64/arch/io.h
@@ -34,22 +34,22 @@
 #include <stdint.h>
 #include <arch/cache.h>
 
-static inline uint8_t readb(volatile void *_a)
+static inline uint8_t readb(volatile const void *_a)
 {
 	dmb();
-	return *(volatile uint8_t *)_a;
+	return *(volatile const uint8_t *)_a;
 }
 
-static inline uint16_t readw(volatile void *_a)
+static inline uint16_t readw(volatile const void *_a)
 {
 	dmb();
-	return *(volatile uint16_t *)_a;
+	return *(volatile const uint16_t *)_a;
 }
 
-static inline uint32_t readl(volatile void *_a)
+static inline uint32_t readl(volatile const void *_a)
 {
 	dmb();
-	return *(volatile uint32_t *)_a;
+	return *(volatile const uint32_t *)_a;
 }
 
 static inline void writeb(uint8_t _v, volatile void *_a)