diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 61ddd4f45ba1fbf07a7e6e528439de9517409731..46fcfa8805f82405b158b2a399750c3f745b6fd0 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -828,9 +828,11 @@ config ARCH_S5P64X0
 
 config ARCH_S5PC100
 	bool "Samsung S5PC100"
-	select ARCH_USES_GETTIMEOFFSET
 	select CLKDEV_LOOKUP
+	select CLKSRC_MMIO
 	select CPU_V7
+	select GENERIC_CLOCKEVENTS
+	select GENERIC_GPIO
 	select HAVE_CLK
 	select HAVE_S3C2410_I2C if I2C
 	select HAVE_S3C2410_WATCHDOG if WATCHDOG
diff --git a/arch/arm/mach-s5pc100/Kconfig b/arch/arm/mach-s5pc100/Kconfig
index 15170be97a74c0ecc69dd481d087205912095837..2f456a4533bafaa332dfaf548f469aec7cf64b7e 100644
--- a/arch/arm/mach-s5pc100/Kconfig
+++ b/arch/arm/mach-s5pc100/Kconfig
@@ -11,6 +11,7 @@ config CPU_S5PC100
 	bool
 	select S5P_EXT_INT
 	select SAMSUNG_DMADEV
+	select SAMSUNG_HRT
 	help
 	  Enable S5PC100 CPU support
 
diff --git a/arch/arm/mach-s5pc100/mach-smdkc100.c b/arch/arm/mach-s5pc100/mach-smdkc100.c
index 185a19583898dc3221d0fa69122a96a21a9d0a6b..8c880f76f27436302d739bc9f877c6769b67724b 100644
--- a/arch/arm/mach-s5pc100/mach-smdkc100.c
+++ b/arch/arm/mach-s5pc100/mach-smdkc100.c
@@ -51,6 +51,7 @@
 #include <linux/platform_data/touchscreen-s3c2410.h>
 #include <linux/platform_data/asoc-s3c.h>
 #include <plat/backlight.h>
+#include <plat/samsung-time.h>
 
 #include "common.h"
 
@@ -221,6 +222,7 @@ static void __init smdkc100_map_io(void)
 	s5pc100_init_io(NULL, 0);
 	s3c24xx_init_clocks(12000000);
 	s3c24xx_init_uarts(smdkc100_uartcfgs, ARRAY_SIZE(smdkc100_uartcfgs));
+	samsung_set_timer_source(SAMSUNG_PWM3, SAMSUNG_PWM4);
 }
 
 static void __init smdkc100_machine_init(void)
@@ -255,6 +257,6 @@ MACHINE_START(SMDKC100, "SMDKC100")
 	.init_irq	= s5pc100_init_irq,
 	.map_io		= smdkc100_map_io,
 	.init_machine	= smdkc100_machine_init,
-	.init_time	= s3c24xx_timer_init,
+	.init_time	= samsung_timer_init,
 	.restart	= s5pc100_restart,
 MACHINE_END
diff --git a/arch/arm/plat-samsung/include/plat/samsung-time.h b/arch/arm/plat-samsung/include/plat/samsung-time.h
index 21198ace3845ea416b14cab2646fd73de8166487..4cc99bb1f1766b451b66a2f5c953719fd5155f0a 100644
--- a/arch/arm/plat-samsung/include/plat/samsung-time.h
+++ b/arch/arm/plat-samsung/include/plat/samsung-time.h
@@ -30,7 +30,7 @@ struct samsung_timer_source {
 /* Be able to sleep for atleast 4 seconds (usually more) */
 #define SAMSUNG_TIMER_MIN_RANGE	4
 
-#ifdef CONFIG_ARCH_S3C24XX
+#if defined(CONFIG_ARCH_S3C24XX) || defined(CONFIG_ARCH_S5PC100)
 #define TCNT_MAX		0xffff
 #define TSCALER_DIV		25
 #define TDIV			50