Exynos5250: add a microsecond timer

Add a microsecond timer, its declaration, the function to start it,
and its usage.  To start it, one calls timer_start().  From that point
on, one can call timer_us() to find microseconds since the timer was
started.

We show its use in the bootblock. You want it started very early.

Finally, the delay.h change having been (ironically) delayed, we
create time.h and have it hold one declaration, for the timer_us() and
timer_start() prototype.

We feel that these two functions should become the hardware specific
functions, allowing us to finally move udelay() into src/lib where it
belongs.

Change-Id: I19cbc2bb0089a3de88cfb94276266af38b9363c5
Signed-off-by: Ronald G. Minnich <rminnich@gmail.com>
Reviewed-on: http://review.coreboot.org/3073
Tested-by: build bot (Jenkins)

1 files changed, 3 insertions, 1 deletions

diff --git a/src/cpu/samsung/exynos5250/Makefile.inc b/src/cpu/samsung/exynos5250/Makefile.inc
index 74bc871f36..1046b8bc0b 100644
--- a/src/cpu/samsung/exynos5250/Makefile.inc
+++ b/src/cpu/samsung/exynos5250/Makefile.inc
@@ -3,7 +3,7 @@
 # image outside of CBFS
 #INTERMEDIATE += exynos5250_add_bl1
 
-bootblock-y += pinmux.c
+bootblock-y += pinmux.c mct.c
 # Clock is required for UART
 bootblock-$(CONFIG_EARLY_CONSOLE) += clock_init.c
 bootblock-$(CONFIG_EARLY_CONSOLE) += clock.c
@@ -16,6 +16,7 @@ romstage-y += pinmux.c  # required by s3c24x0_i2c (exynos5-common) and uart.
 romstage-y += dmc_common.c
 romstage-y += dmc_init_ddr3.c
 romstage-y += power.c
+romstage-y += mct.c
 romstage-$(CONFIG_EARLY_CONSOLE) += soc.c
 romstage-$(CONFIG_EARLY_CONSOLE) += uart.c
 
@@ -27,6 +28,7 @@ ramstage-y += power.c
 ramstage-y += soc.c
 ramstage-$(CONFIG_CONSOLE_SERIAL_UART) += uart.c
 ramstage-y += cpu.c
+ramstage-y += mct.c
 
 #ramstage-$(CONFIG_SATA_AHCI) += sata.c