[PATCH 1/9] clocksource: make available in PBL

[Ahmad Fatoum]

We currently have some adhoc early_udelay implementations in PBL.
As the clocksource framework is already very lightweight, let's port it
to allow dropping early_udelay in future.

Signed-off-by: Ahmad Fatoum <a.fat...@pengutronix.de>
---
 common/Makefile | 1 +
 common/clock.c  | 5 ++++-
 include/sched.h | 2 +-
 pbl/Kconfig     | 3 +++
 4 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/common/Makefile b/common/Makefile
index 9b67187561bf..e12eef4691fe 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -5,6 +5,7 @@ obj-y                           += memory.o
 obj-y                          += memory_display.o
 pbl-$(CONFIG_PBL_CONSOLE)      += memory_display.o
 obj-y                          += clock.o
+pbl-$(CONFIG_PBL_CLOCKSOURCE)  += clock.o
 obj-y                          += console_common.o
 obj-$(CONFIG_OFDEVICE)         += deep-probe.o
 obj-y                          += startup.o
diff --git a/common/clock.c b/common/clock.c
index b300e5798a16..15e26c67c887 100644
--- a/common/clock.c
+++ b/common/clock.c
@@ -34,7 +34,7 @@ static struct clocksource dummy_cs = {
        .priority = -1,
 };
 
-static struct clocksource *current_clock = &dummy_cs;
+static struct clocksource *current_clock = IN_PROPER ? &dummy_cs : NULL;
 
 static int dummy_csrc_warn(void)
 {
@@ -55,6 +55,9 @@ uint64_t get_time_ns(void)
        uint64_t cycle_now, cycle_delta;
        uint64_t ns_offset;
 
+       if (IN_PBL && !cs)
+               panic("No PBL clocksource has been initialized\n");
+
        /* read clocksource: */
        cycle_now = cs->read() & cs->mask;
 
diff --git a/include/sched.h b/include/sched.h
index 4dadff20696e..0b5e91f0be44 100644
--- a/include/sched.h
+++ b/include/sched.h
@@ -2,7 +2,7 @@
 #ifndef __BAREBOX_SCHED_H_
 #define __BAREBOX_SCHED_H_
 
-#ifdef CONFIG_HAS_SCHED
+#if defined CONFIG_HAS_SCHED && IN_PROPER
 void resched(void);
 #else
 static inline void resched(void)
diff --git a/pbl/Kconfig b/pbl/Kconfig
index 98d71791454b..6e3581829d58 100644
--- a/pbl/Kconfig
+++ b/pbl/Kconfig
@@ -57,6 +57,9 @@ config PBL_VERIFY_PIGGY
        depends on ARM || MIPS || RISCV
        bool "Verify barebox proper hash before decompression" if COMPILE_TEST
 
+config PBL_CLOCKSOURCE
+       bool
+
 config BOARD_GENERIC_DT
        bool
        select LIBFDT
-- 
2.39.5