[PATCH 3/3] pbl: introduce HAS_PBL_CLOCKSOURCE marker

[Stefan Kerkmann]

This finally enables the usage of the polled timeout functions in the
barebox pbl with real timeouts for supported architectures. Currently
only ARMv7 and ARMv8 are enabled.

Signed-off-by: Stefan Kerkmann <s.kerkmann at pengutronix.de>
---
 arch/arm/cpu/Kconfig    | 2 ++
 arch/arm/lib32/Makefile | 2 +-
 include/linux/iopoll.h  | 8 ++++----
 pbl/Kconfig             | 3 +++
 4 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/arch/arm/cpu/Kconfig b/arch/arm/cpu/Kconfig
index 84fe770b6da892723528eeea89ae2b0eda122d07..3569f3d3483a6289d7a6eca3d1715e06144df8d4 100644
--- a/arch/arm/cpu/Kconfig
+++ b/arch/arm/cpu/Kconfig
@@ -84,6 +84,7 @@ config CPU_V6
 config CPU_V7
 	bool
 	select CPU_32v7
+	select HAS_PBL_CLOCKSOURCE
 
 # ARMv8
 config CPU_V8
@@ -125,6 +126,7 @@ config CPU_32v7
 config CPU_64v8
 	bool
 	select CPU_64
+	select HAS_PBL_CLOCKSOURCE
 
 comment "processor features"
 
diff --git a/arch/arm/lib32/Makefile b/arch/arm/lib32/Makefile
index a139a80fb84973e01e24b063eb6b1d774a60a056..4509d483b27ec7da038b17729f552d6f09fd39ec 100644
--- a/arch/arm/lib32/Makefile
+++ b/arch/arm/lib32/Makefile
@@ -31,7 +31,7 @@ extra-y += barebox.lds
 pbl-y	+= lib1funcs.o
 pbl-y	+= ashldi3.o
 pbl-y	+= div0.o
-pbl-$(CONFIG_CPU_32v7)	+= arm_architected_timer.o
+pbl-$(CONFIG_HAS_PBL_CLOCKSOURCE)	+= arm_architected_timer.o
 CFLAGS_arm_architected_timer.o := -march=armv7-a
 
 obj-pbl-y	+= setjmp.o
diff --git a/include/linux/iopoll.h b/include/linux/iopoll.h
index 9350a3d05007fbf760e2dea2a981cb86641343fd..df7fdbfa4ae0aec825cc02afa8f14d1ea1f1e535 100644
--- a/include/linux/iopoll.h
+++ b/include/linux/iopoll.h
@@ -26,19 +26,19 @@
  * When available, you'll probably want to use one of the specialized
  * macros defined below rather than this macro directly.
  *
- * We do not have timing functions in the PBL, so ignore the timeout value and
- * loop infinitely here.
+ * In the PBL the timeout is ignored if timing functions are not implemented.
+ * This potentially means looping infinitely!
  */
 #define read_poll_timeout(op, val, cond, timeout_us, args...)	\
 ({ \
 	uint64_t start = 0; \
-	if (IN_PROPER && (timeout_us) != 0) \
+	if ((IN_PROPER || IS_ENABLED(CONFIG_HAS_PBL_CLOCKSOURCE)) && (timeout_us) != 0) \
 		start = get_time_ns(); \
 	for (;;) { \
 		(val) = op(args); \
 		if (cond) \
 			break; \
-		if (IN_PROPER && (timeout_us) != 0 && \
+		if ((IN_PROPER || IS_ENABLED(CONFIG_HAS_PBL_CLOCKSOURCE)) && (timeout_us) != 0 && \
 		    is_timeout(start, ((timeout_us) * USECOND))) { \
 			(val) = op(args); \
 			break; \
diff --git a/pbl/Kconfig b/pbl/Kconfig
index 98d71791454b1a31f315ca3fdffa675e6d3dcb50..c2697a2bd00d807a78ac6bc9f0bcf7b28d150c59 100644
--- a/pbl/Kconfig
+++ b/pbl/Kconfig
@@ -26,6 +26,9 @@ config PBL_SINGLE_IMAGE
 	depends on !HAVE_PBL_MULTI_IMAGES
 	default y
 
+config HAS_PBL_CLOCKSOURCE
+	bool
+
 if PBL_IMAGE
 
 config USE_COMPRESSED_DTB

-- 
2.39.5