[PATCH v2 01/12] ARM: SAMSUNG: Move samsung-time to drivers/clocksource

[Tomasz Figa <tomasz.figa@gmail.com>]

This patch moves the Samsung PWM-based high resolution timer support
code from arch/arm/plat-samsung to drivers/clocksource.

This is a prerequisite for further work on making the driver more
multiplatform and Device Tree friendly.

Signed-off-by: Tomasz Figa <tomasz.figa@gmail.com>
---
 arch/arm/plat-samsung/Kconfig        |   8 -
 arch/arm/plat-samsung/Makefile       |   1 -
 arch/arm/plat-samsung/samsung-time.c | 394 -----------------------------------
 drivers/clocksource/Kconfig          |   7 +
 drivers/clocksource/Makefile         |   1 +
 drivers/clocksource/samsung-time.c   | 394 +++++++++++++++++++++++++++++++++++
 6 files changed, 402 insertions(+), 403 deletions(-)
 delete mode 100644 arch/arm/plat-samsung/samsung-time.c
 create mode 100644 drivers/clocksource/samsung-time.c

diff --git a/arch/arm/plat-samsung/Kconfig b/arch/arm/plat-samsung/Kconfig
index b708b3e..07ae984 100644
--- a/arch/arm/plat-samsung/Kconfig
+++ b/arch/arm/plat-samsung/Kconfig
@@ -68,14 +68,6 @@ config S3C_LOWLEVEL_UART_PORT
 	  this configuration should be between zero and two. The port
 	  must have been initialised by the boot-loader before use.
 
-# timer options
-
-config SAMSUNG_HRT
-	bool
-	select SAMSUNG_DEV_PWM
-	help
-	  Use the High Resolution timer support
-
 # clock options
 
 config SAMSUNG_CLOCK
diff --git a/arch/arm/plat-samsung/Makefile b/arch/arm/plat-samsung/Makefile
index a23c460..87494e1 100644
--- a/arch/arm/plat-samsung/Makefile
+++ b/arch/arm/plat-samsung/Makefile
@@ -12,7 +12,6 @@ obj-				:=
 # Objects we always build independent of SoC choice
 
 obj-y				+= init.o cpu.o
-obj-$(CONFIG_SAMSUNG_HRT) 	+= samsung-time.o
 
 obj-$(CONFIG_SAMSUNG_CLOCK)	+= clock.o
 obj-$(CONFIG_SAMSUNG_CLOCK)	+= pwm-clock.o
diff --git a/arch/arm/plat-samsung/samsung-time.c b/arch/arm/plat-samsung/samsung-time.c
deleted file mode 100644
index f899cbc..0000000
--- a/arch/arm/plat-samsung/samsung-time.c
+++ /dev/null
@@ -1,394 +0,0 @@
-/*
- * Copyright (c) 2011 Samsung Electronics Co., Ltd.
- *		http://www.samsung.com/
- *
- * samsung - Common hr-timer support (s3c and s5p)
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
-*/
-
-#include <linux/interrupt.h>
-#include <linux/irq.h>
-#include <linux/err.h>
-#include <linux/clk.h>
-#include <linux/clockchips.h>
-#include <linux/platform_device.h>
-
-#include <asm/smp_twd.h>
-#include <asm/mach/time.h>
-#include <asm/mach/arch.h>
-#include <asm/mach/map.h>
-#include <asm/sched_clock.h>
-
-#include <mach/map.h>
-#include <plat/devs.h>
-#include <plat/regs-timer.h>
-#include <plat/samsung-time.h>
-
-static struct clk *tin_event;
-static struct clk *tin_source;
-static struct clk *tdiv_event;
-static struct clk *tdiv_source;
-static struct clk *timerclk;
-static struct samsung_timer_source timer_source;
-static unsigned long clock_count_per_tick;
-static void samsung_timer_resume(void);
-
-static void samsung_time_stop(enum samsung_timer_mode mode)
-{
-	unsigned long tcon;
-
-	tcon = __raw_readl(S3C2410_TCON);
-
-	switch (mode) {
-	case SAMSUNG_PWM0:
-		tcon &= ~S3C2410_TCON_T0START;
-		break;
-
-	case SAMSUNG_PWM1:
-		tcon &= ~S3C2410_TCON_T1START;
-		break;
-
-	case SAMSUNG_PWM2:
-		tcon &= ~S3C2410_TCON_T2START;
-		break;
-
-	case SAMSUNG_PWM3:
-		tcon &= ~S3C2410_TCON_T3START;
-		break;
-
-	case SAMSUNG_PWM4:
-		tcon &= ~S3C2410_TCON_T4START;
-		break;
-
-	default:
-		printk(KERN_ERR "Invalid Timer %d\n", mode);
-		break;
-	}
-	__raw_writel(tcon, S3C2410_TCON);
-}
-
-static void samsung_time_setup(enum samsung_timer_mode mode, unsigned long tcnt)
-{
-	unsigned long tcon;
-
-	tcon = __raw_readl(S3C2410_TCON);
-
-	tcnt--;
-
-	switch (mode) {
-	case SAMSUNG_PWM0:
-		tcon &= ~(0x0f << 0);
-		tcon |= S3C2410_TCON_T0MANUALUPD;
-		break;
-
-	case SAMSUNG_PWM1:
-		tcon &= ~(0x0f << 8);
-		tcon |= S3C2410_TCON_T1MANUALUPD;
-		break;
-
-	case SAMSUNG_PWM2:
-		tcon &= ~(0x0f << 12);
-		tcon |= S3C2410_TCON_T2MANUALUPD;
-		break;
-
-	case SAMSUNG_PWM3:
-		tcon &= ~(0x0f << 16);
-		tcon |= S3C2410_TCON_T3MANUALUPD;
-		break;
-
-	case SAMSUNG_PWM4:
-		tcon &= ~(0x07 << 20);
-		tcon |= S3C2410_TCON_T4MANUALUPD;
-		break;
-
-	default:
-		printk(KERN_ERR "Invalid Timer %d\n", mode);
-		break;
-	}
-
-	__raw_writel(tcnt, S3C2410_TCNTB(mode));
-	__raw_writel(tcnt, S3C2410_TCMPB(mode));
-	__raw_writel(tcon, S3C2410_TCON);
-}
-
-static void samsung_time_start(enum samsung_timer_mode mode, bool periodic)
-{
-	unsigned long tcon;
-
-	tcon  = __raw_readl(S3C2410_TCON);
-
-	switch (mode) {
-	case SAMSUNG_PWM0:
-		tcon |= S3C2410_TCON_T0START;
-		tcon &= ~S3C2410_TCON_T0MANUALUPD;
-
-		if (periodic)
-			tcon |= S3C2410_TCON_T0RELOAD;
-		else
-			tcon &= ~S3C2410_TCON_T0RELOAD;
-		break;
-
-	case SAMSUNG_PWM1:
-		tcon |= S3C2410_TCON_T1START;
-		tcon &= ~S3C2410_TCON_T1MANUALUPD;
-
-		if (periodic)
-			tcon |= S3C2410_TCON_T1RELOAD;
-		else
-			tcon &= ~S3C2410_TCON_T1RELOAD;
-		break;
-
-	case SAMSUNG_PWM2:
-		tcon |= S3C2410_TCON_T2START;
-		tcon &= ~S3C2410_TCON_T2MANUALUPD;
-
-		if (periodic)
-			tcon |= S3C2410_TCON_T2RELOAD;
-		else
-			tcon &= ~S3C2410_TCON_T2RELOAD;
-		break;
-
-	case SAMSUNG_PWM3:
-		tcon |= S3C2410_TCON_T3START;
-		tcon &= ~S3C2410_TCON_T3MANUALUPD;
-
-		if (periodic)
-			tcon |= S3C2410_TCON_T3RELOAD;
-		else
-			tcon &= ~S3C2410_TCON_T3RELOAD;
-		break;
-
-	case SAMSUNG_PWM4:
-		tcon |= S3C2410_TCON_T4START;
-		tcon &= ~S3C2410_TCON_T4MANUALUPD;
-
-		if (periodic)
-			tcon |= S3C2410_TCON_T4RELOAD;
-		else
-			tcon &= ~S3C2410_TCON_T4RELOAD;
-		break;
-
-	default:
-		printk(KERN_ERR "Invalid Timer %d\n", mode);
-		break;
-	}
-	__raw_writel(tcon, S3C2410_TCON);
-}
-
-static int samsung_set_next_event(unsigned long cycles,
-				struct clock_event_device *evt)
-{
-	samsung_time_setup(timer_source.event_id, cycles);
-	samsung_time_start(timer_source.event_id, NON_PERIODIC);
-
-	return 0;
-}
-
-static void samsung_set_mode(enum clock_event_mode mode,
-				struct clock_event_device *evt)
-{
-	samsung_time_stop(timer_source.event_id);
-
-	switch (mode) {
-	case CLOCK_EVT_MODE_PERIODIC:
-		samsung_time_setup(timer_source.event_id, clock_count_per_tick);
-		samsung_time_start(timer_source.event_id, PERIODIC);
-		break;
-
-	case CLOCK_EVT_MODE_ONESHOT:
-		break;
-
-	case CLOCK_EVT_MODE_UNUSED:
-	case CLOCK_EVT_MODE_SHUTDOWN:
-		break;
-
-	case CLOCK_EVT_MODE_RESUME:
-		samsung_timer_resume();
-		break;
-	}
-}
-
-static void samsung_timer_resume(void)
-{
-	/* event timer restart */
-	samsung_time_setup(timer_source.event_id, clock_count_per_tick);
-	samsung_time_start(timer_source.event_id, PERIODIC);
-
-	/* source timer restart */
-	samsung_time_setup(timer_source.source_id, TCNT_MAX);
-	samsung_time_start(timer_source.source_id, PERIODIC);
-}
-
-void __init samsung_set_timer_source(enum samsung_timer_mode event,
-				 enum samsung_timer_mode source)
-{
-	s3c_device_timer[event].dev.bus = &platform_bus_type;
-	s3c_device_timer[source].dev.bus = &platform_bus_type;
-
-	timer_source.event_id = event;
-	timer_source.source_id = source;
-}
-
-static struct clock_event_device time_event_device = {
-	.name		= "samsung_event_timer",
-	.features	= CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
-	.rating		= 200,
-	.set_next_event	= samsung_set_next_event,
-	.set_mode	= samsung_set_mode,
-};
-
-static irqreturn_t samsung_clock_event_isr(int irq, void *dev_id)
-{
-	struct clock_event_device *evt = dev_id;
-
-	evt->event_handler(evt);
-
-	return IRQ_HANDLED;
-}
-
-static struct irqaction samsung_clock_event_irq = {
-	.name		= "samsung_time_irq",
-	.flags		= IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
-	.handler	= samsung_clock_event_isr,
-	.dev_id		= &time_event_device,
-};
-
-static void __init samsung_clockevent_init(void)
-{
-	unsigned long pclk;
-	unsigned long clock_rate;
-	unsigned int irq_number;
-	struct clk *tscaler;
-
-	pclk = clk_get_rate(timerclk);
-
-	tscaler = clk_get_parent(tdiv_event);
-
-	clk_set_rate(tscaler, pclk / TSCALER_DIV);
-	clk_set_rate(tdiv_event, pclk / TDIV);
-	clk_set_parent(tin_event, tdiv_event);
-
-	clock_rate = clk_get_rate(tin_event);
-	clock_count_per_tick = clock_rate / HZ;
-
-	time_event_device.cpumask = cpumask_of(0);
-	clockevents_config_and_register(&time_event_device, clock_rate, 1, -1);
-
-	irq_number = timer_source.event_id + IRQ_TIMER0;
-	setup_irq(irq_number, &samsung_clock_event_irq);
-}
-
-static void __iomem *samsung_timer_reg(void)
-{
-	unsigned long offset = 0;
-
-	switch (timer_source.source_id) {
-	case SAMSUNG_PWM0:
-	case SAMSUNG_PWM1:
-	case SAMSUNG_PWM2:
-	case SAMSUNG_PWM3:
-		offset = (timer_source.source_id * 0x0c) + 0x14;
-		break;
-
-	case SAMSUNG_PWM4:
-		offset = 0x40;
-		break;
-
-	default:
-		printk(KERN_ERR "Invalid Timer %d\n", timer_source.source_id);
-		return NULL;
-	}
-
-	return S3C_TIMERREG(offset);
-}
-
-/*
- * Override the global weak sched_clock symbol with this
- * local implementation which uses the clocksource to get some
- * better resolution when scheduling the kernel. We accept that
- * this wraps around for now, since it is just a relative time
- * stamp. (Inspired by U300 implementation.)
- */
-static u32 notrace samsung_read_sched_clock(void)
-{
-	void __iomem *reg = samsung_timer_reg();
-
-	if (!reg)
-		return 0;
-
-	return ~__raw_readl(reg);
-}
-
-static void __init samsung_clocksource_init(void)
-{
-	unsigned long pclk;
-	unsigned long clock_rate;
-
-	pclk = clk_get_rate(timerclk);
-
-	clk_set_rate(tdiv_source, pclk / TDIV);
-	clk_set_parent(tin_source, tdiv_source);
-
-	clock_rate = clk_get_rate(tin_source);
-
-	samsung_time_setup(timer_source.source_id, TCNT_MAX);
-	samsung_time_start(timer_source.source_id, PERIODIC);
-
-	setup_sched_clock(samsung_read_sched_clock, TSIZE, clock_rate);
-
-	if (clocksource_mmio_init(samsung_timer_reg(), "samsung_clocksource_timer",
-			clock_rate, 250, TSIZE, clocksource_mmio_readl_down))
-		panic("samsung_clocksource_timer: can't register clocksource\n");
-}
-
-static void __init samsung_timer_resources(void)
-{
-
-	unsigned long event_id = timer_source.event_id;
-	unsigned long source_id = timer_source.source_id;
-	char devname[15];
-
-	timerclk = clk_get(NULL, "timers");
-	if (IS_ERR(timerclk))
-		panic("failed to get timers clock for timer");
-
-	clk_enable(timerclk);
-
-	sprintf(devname, "s3c24xx-pwm.%lu", event_id);
-	s3c_device_timer[event_id].id = event_id;
-	s3c_device_timer[event_id].dev.init_name = devname;
-
-	tin_event = clk_get(&s3c_device_timer[event_id].dev, "pwm-tin");
-	if (IS_ERR(tin_event))
-		panic("failed to get pwm-tin clock for event timer");
-
-	tdiv_event = clk_get(&s3c_device_timer[event_id].dev, "pwm-tdiv");
-	if (IS_ERR(tdiv_event))
-		panic("failed to get pwm-tdiv clock for event timer");
-
-	clk_enable(tin_event);
-
-	sprintf(devname, "s3c24xx-pwm.%lu", source_id);
-	s3c_device_timer[source_id].id = source_id;
-	s3c_device_timer[source_id].dev.init_name = devname;
-
-	tin_source = clk_get(&s3c_device_timer[source_id].dev, "pwm-tin");
-	if (IS_ERR(tin_source))
-		panic("failed to get pwm-tin clock for source timer");
-
-	tdiv_source = clk_get(&s3c_device_timer[source_id].dev, "pwm-tdiv");
-	if (IS_ERR(tdiv_source))
-		panic("failed to get pwm-tdiv clock for source timer");
-
-	clk_enable(tin_source);
-}
-
-void __init samsung_timer_init(void)
-{
-	samsung_timer_resources();
-	samsung_clockevent_init();
-	samsung_clocksource_init();
-}
diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index a32b7a9..89e4c76 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -25,6 +25,13 @@ config DW_APB_TIMER_OF
 config ARMADA_370_XP_TIMER
 	bool
 
+config SAMSUNG_HRT
+	bool
+	depends on PLAT_SAMSUNG
+	select SAMSUNG_DEV_PWM
+	help
+	  Use the high resolution timer support on Samsung platforms.
+
 config SUNXI_TIMER
 	bool
 
diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
index a33f792..d61ba40 100644
--- a/drivers/clocksource/Makefile
+++ b/drivers/clocksource/Makefile
@@ -16,6 +16,7 @@ obj-$(CONFIG_CLKSRC_NOMADIK_MTU)	+= nomadik-mtu.o
 obj-$(CONFIG_CLKSRC_DBX500_PRCMU)	+= clksrc-dbx500-prcmu.o
 obj-$(CONFIG_ARMADA_370_XP_TIMER)	+= time-armada-370-xp.o
 obj-$(CONFIG_ARCH_BCM2835)	+= bcm2835_timer.o
+obj-$(CONFIG_SAMSUNG_HRT) 	+= samsung-time.o
 obj-$(CONFIG_SUNXI_TIMER)	+= sunxi_timer.o
 
 obj-$(CONFIG_CLKSRC_ARM_GENERIC)	+= arm_generic.o
diff --git a/drivers/clocksource/samsung-time.c b/drivers/clocksource/samsung-time.c
new file mode 100644
index 0000000..f899cbc
--- /dev/null
+++ b/drivers/clocksource/samsung-time.c
@@ -0,0 +1,394 @@
+/*
+ * Copyright (c) 2011 Samsung Electronics Co., Ltd.
+ *		http://www.samsung.com/
+ *
+ * samsung - Common hr-timer support (s3c and s5p)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/err.h>
+#include <linux/clk.h>
+#include <linux/clockchips.h>
+#include <linux/platform_device.h>
+
+#include <asm/smp_twd.h>
+#include <asm/mach/time.h>
+#include <asm/mach/arch.h>
+#include <asm/mach/map.h>
+#include <asm/sched_clock.h>
+
+#include <mach/map.h>
+#include <plat/devs.h>
+#include <plat/regs-timer.h>
+#include <plat/samsung-time.h>
+
+static struct clk *tin_event;
+static struct clk *tin_source;
+static struct clk *tdiv_event;
+static struct clk *tdiv_source;
+static struct clk *timerclk;
+static struct samsung_timer_source timer_source;
+static unsigned long clock_count_per_tick;
+static void samsung_timer_resume(void);
+
+static void samsung_time_stop(enum samsung_timer_mode mode)
+{
+	unsigned long tcon;
+
+	tcon = __raw_readl(S3C2410_TCON);
+
+	switch (mode) {
+	case SAMSUNG_PWM0:
+		tcon &= ~S3C2410_TCON_T0START;
+		break;
+
+	case SAMSUNG_PWM1:
+		tcon &= ~S3C2410_TCON_T1START;
+		break;
+
+	case SAMSUNG_PWM2:
+		tcon &= ~S3C2410_TCON_T2START;
+		break;
+
+	case SAMSUNG_PWM3:
+		tcon &= ~S3C2410_TCON_T3START;
+		break;
+
+	case SAMSUNG_PWM4:
+		tcon &= ~S3C2410_TCON_T4START;
+		break;
+
+	default:
+		printk(KERN_ERR "Invalid Timer %d\n", mode);
+		break;
+	}
+	__raw_writel(tcon, S3C2410_TCON);
+}
+
+static void samsung_time_setup(enum samsung_timer_mode mode, unsigned long tcnt)
+{
+	unsigned long tcon;
+
+	tcon = __raw_readl(S3C2410_TCON);
+
+	tcnt--;
+
+	switch (mode) {
+	case SAMSUNG_PWM0:
+		tcon &= ~(0x0f << 0);
+		tcon |= S3C2410_TCON_T0MANUALUPD;
+		break;
+
+	case SAMSUNG_PWM1:
+		tcon &= ~(0x0f << 8);
+		tcon |= S3C2410_TCON_T1MANUALUPD;
+		break;
+
+	case SAMSUNG_PWM2:
+		tcon &= ~(0x0f << 12);
+		tcon |= S3C2410_TCON_T2MANUALUPD;
+		break;
+
+	case SAMSUNG_PWM3:
+		tcon &= ~(0x0f << 16);
+		tcon |= S3C2410_TCON_T3MANUALUPD;
+		break;
+
+	case SAMSUNG_PWM4:
+		tcon &= ~(0x07 << 20);
+		tcon |= S3C2410_TCON_T4MANUALUPD;
+		break;
+
+	default:
+		printk(KERN_ERR "Invalid Timer %d\n", mode);
+		break;
+	}
+
+	__raw_writel(tcnt, S3C2410_TCNTB(mode));
+	__raw_writel(tcnt, S3C2410_TCMPB(mode));
+	__raw_writel(tcon, S3C2410_TCON);
+}
+
+static void samsung_time_start(enum samsung_timer_mode mode, bool periodic)
+{
+	unsigned long tcon;
+
+	tcon  = __raw_readl(S3C2410_TCON);
+
+	switch (mode) {
+	case SAMSUNG_PWM0:
+		tcon |= S3C2410_TCON_T0START;
+		tcon &= ~S3C2410_TCON_T0MANUALUPD;
+
+		if (periodic)
+			tcon |= S3C2410_TCON_T0RELOAD;
+		else
+			tcon &= ~S3C2410_TCON_T0RELOAD;
+		break;
+
+	case SAMSUNG_PWM1:
+		tcon |= S3C2410_TCON_T1START;
+		tcon &= ~S3C2410_TCON_T1MANUALUPD;
+
+		if (periodic)
+			tcon |= S3C2410_TCON_T1RELOAD;
+		else
+			tcon &= ~S3C2410_TCON_T1RELOAD;
+		break;
+
+	case SAMSUNG_PWM2:
+		tcon |= S3C2410_TCON_T2START;
+		tcon &= ~S3C2410_TCON_T2MANUALUPD;
+
+		if (periodic)
+			tcon |= S3C2410_TCON_T2RELOAD;
+		else
+			tcon &= ~S3C2410_TCON_T2RELOAD;
+		break;
+
+	case SAMSUNG_PWM3:
+		tcon |= S3C2410_TCON_T3START;
+		tcon &= ~S3C2410_TCON_T3MANUALUPD;
+
+		if (periodic)
+			tcon |= S3C2410_TCON_T3RELOAD;
+		else
+			tcon &= ~S3C2410_TCON_T3RELOAD;
+		break;
+
+	case SAMSUNG_PWM4:
+		tcon |= S3C2410_TCON_T4START;
+		tcon &= ~S3C2410_TCON_T4MANUALUPD;
+
+		if (periodic)
+			tcon |= S3C2410_TCON_T4RELOAD;
+		else
+			tcon &= ~S3C2410_TCON_T4RELOAD;
+		break;
+
+	default:
+		printk(KERN_ERR "Invalid Timer %d\n", mode);
+		break;
+	}
+	__raw_writel(tcon, S3C2410_TCON);
+}
+
+static int samsung_set_next_event(unsigned long cycles,
+				struct clock_event_device *evt)
+{
+	samsung_time_setup(timer_source.event_id, cycles);
+	samsung_time_start(timer_source.event_id, NON_PERIODIC);
+
+	return 0;
+}
+
+static void samsung_set_mode(enum clock_event_mode mode,
+				struct clock_event_device *evt)
+{
+	samsung_time_stop(timer_source.event_id);
+
+	switch (mode) {
+	case CLOCK_EVT_MODE_PERIODIC:
+		samsung_time_setup(timer_source.event_id, clock_count_per_tick);
+		samsung_time_start(timer_source.event_id, PERIODIC);
+		break;
+
+	case CLOCK_EVT_MODE_ONESHOT:
+		break;
+
+	case CLOCK_EVT_MODE_UNUSED:
+	case CLOCK_EVT_MODE_SHUTDOWN:
+		break;
+
+	case CLOCK_EVT_MODE_RESUME:
+		samsung_timer_resume();
+		break;
+	}
+}
+
+static void samsung_timer_resume(void)
+{
+	/* event timer restart */
+	samsung_time_setup(timer_source.event_id, clock_count_per_tick);
+	samsung_time_start(timer_source.event_id, PERIODIC);
+
+	/* source timer restart */
+	samsung_time_setup(timer_source.source_id, TCNT_MAX);
+	samsung_time_start(timer_source.source_id, PERIODIC);
+}
+
+void __init samsung_set_timer_source(enum samsung_timer_mode event,
+				 enum samsung_timer_mode source)
+{
+	s3c_device_timer[event].dev.bus = &platform_bus_type;
+	s3c_device_timer[source].dev.bus = &platform_bus_type;
+
+	timer_source.event_id = event;
+	timer_source.source_id = source;
+}
+
+static struct clock_event_device time_event_device = {
+	.name		= "samsung_event_timer",
+	.features	= CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
+	.rating		= 200,
+	.set_next_event	= samsung_set_next_event,
+	.set_mode	= samsung_set_mode,
+};
+
+static irqreturn_t samsung_clock_event_isr(int irq, void *dev_id)
+{
+	struct clock_event_device *evt = dev_id;
+
+	evt->event_handler(evt);
+
+	return IRQ_HANDLED;
+}
+
+static struct irqaction samsung_clock_event_irq = {
+	.name		= "samsung_time_irq",
+	.flags		= IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
+	.handler	= samsung_clock_event_isr,
+	.dev_id		= &time_event_device,
+};
+
+static void __init samsung_clockevent_init(void)
+{
+	unsigned long pclk;
+	unsigned long clock_rate;
+	unsigned int irq_number;
+	struct clk *tscaler;
+
+	pclk = clk_get_rate(timerclk);
+
+	tscaler = clk_get_parent(tdiv_event);
+
+	clk_set_rate(tscaler, pclk / TSCALER_DIV);
+	clk_set_rate(tdiv_event, pclk / TDIV);
+	clk_set_parent(tin_event, tdiv_event);
+
+	clock_rate = clk_get_rate(tin_event);
+	clock_count_per_tick = clock_rate / HZ;
+
+	time_event_device.cpumask = cpumask_of(0);
+	clockevents_config_and_register(&time_event_device, clock_rate, 1, -1);
+
+	irq_number = timer_source.event_id + IRQ_TIMER0;
+	setup_irq(irq_number, &samsung_clock_event_irq);
+}
+
+static void __iomem *samsung_timer_reg(void)
+{
+	unsigned long offset = 0;
+
+	switch (timer_source.source_id) {
+	case SAMSUNG_PWM0:
+	case SAMSUNG_PWM1:
+	case SAMSUNG_PWM2:
+	case SAMSUNG_PWM3:
+		offset = (timer_source.source_id * 0x0c) + 0x14;
+		break;
+
+	case SAMSUNG_PWM4:
+		offset = 0x40;
+		break;
+
+	default:
+		printk(KERN_ERR "Invalid Timer %d\n", timer_source.source_id);
+		return NULL;
+	}
+
+	return S3C_TIMERREG(offset);
+}
+
+/*
+ * Override the global weak sched_clock symbol with this
+ * local implementation which uses the clocksource to get some
+ * better resolution when scheduling the kernel. We accept that
+ * this wraps around for now, since it is just a relative time
+ * stamp. (Inspired by U300 implementation.)
+ */
+static u32 notrace samsung_read_sched_clock(void)
+{
+	void __iomem *reg = samsung_timer_reg();
+
+	if (!reg)
+		return 0;
+
+	return ~__raw_readl(reg);
+}
+
+static void __init samsung_clocksource_init(void)
+{
+	unsigned long pclk;
+	unsigned long clock_rate;
+
+	pclk = clk_get_rate(timerclk);
+
+	clk_set_rate(tdiv_source, pclk / TDIV);
+	clk_set_parent(tin_source, tdiv_source);
+
+	clock_rate = clk_get_rate(tin_source);
+
+	samsung_time_setup(timer_source.source_id, TCNT_MAX);
+	samsung_time_start(timer_source.source_id, PERIODIC);
+
+	setup_sched_clock(samsung_read_sched_clock, TSIZE, clock_rate);
+
+	if (clocksource_mmio_init(samsung_timer_reg(), "samsung_clocksource_timer",
+			clock_rate, 250, TSIZE, clocksource_mmio_readl_down))
+		panic("samsung_clocksource_timer: can't register clocksource\n");
+}
+
+static void __init samsung_timer_resources(void)
+{
+
+	unsigned long event_id = timer_source.event_id;
+	unsigned long source_id = timer_source.source_id;
+	char devname[15];
+
+	timerclk = clk_get(NULL, "timers");
+	if (IS_ERR(timerclk))
+		panic("failed to get timers clock for timer");
+
+	clk_enable(timerclk);
+
+	sprintf(devname, "s3c24xx-pwm.%lu", event_id);
+	s3c_device_timer[event_id].id = event_id;
+	s3c_device_timer[event_id].dev.init_name = devname;
+
+	tin_event = clk_get(&s3c_device_timer[event_id].dev, "pwm-tin");
+	if (IS_ERR(tin_event))
+		panic("failed to get pwm-tin clock for event timer");
+
+	tdiv_event = clk_get(&s3c_device_timer[event_id].dev, "pwm-tdiv");
+	if (IS_ERR(tdiv_event))
+		panic("failed to get pwm-tdiv clock for event timer");
+
+	clk_enable(tin_event);
+
+	sprintf(devname, "s3c24xx-pwm.%lu", source_id);
+	s3c_device_timer[source_id].id = source_id;
+	s3c_device_timer[source_id].dev.init_name = devname;
+
+	tin_source = clk_get(&s3c_device_timer[source_id].dev, "pwm-tin");
+	if (IS_ERR(tin_source))
+		panic("failed to get pwm-tin clock for source timer");
+
+	tdiv_source = clk_get(&s3c_device_timer[source_id].dev, "pwm-tdiv");
+	if (IS_ERR(tdiv_source))
+		panic("failed to get pwm-tdiv clock for source timer");
+
+	clk_enable(tin_source);
+}
+
+void __init samsung_timer_init(void)
+{
+	samsung_timer_resources();
+	samsung_clockevent_init();
+	samsung_clocksource_init();
+}
-- 
1.8.1.2