13 files changed, 648 insertions, 185 deletions

diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index e8c45328515..73fcddb8314 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -31,6 +31,9 @@ config SUNXI_TIMER
 config VT8500_TIMER
 	bool
 
+config CADENCE_TTC_TIMER
+	bool
+
 config CLKSRC_NOMADIK_MTU
 	bool
 	depends on (ARCH_NOMADIK || ARCH_U8500)
diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
index 1c1b15db7c4..cd1f09cbd61 100644
--- a/drivers/clocksource/Makefile
+++ b/drivers/clocksource/Makefile
@@ -19,6 +19,7 @@ obj-$(CONFIG_ARCH_BCM2835)	+= bcm2835_timer.o
 obj-$(CONFIG_SUNXI_TIMER)	+= sunxi_timer.o
 obj-$(CONFIG_ARCH_TEGRA)	+= tegra20_timer.o
 obj-$(CONFIG_VT8500_TIMER)	+= vt8500_timer.o
+obj-$(CONFIG_CADENCE_TTC_TIMER)	+= cadence_ttc_timer.o
 obj-$(CONFIG_CLKSRC_EXYNOS_MCT)	+= exynos_mct.o
 
 obj-$(CONFIG_ARM_ARCH_TIMER)		+= arm_arch_timer.o
diff --git a/drivers/clocksource/bcm2835_timer.c b/drivers/clocksource/bcm2835_timer.c
index 50c68fef944..766611d2994 100644
--- a/drivers/clocksource/bcm2835_timer.c
+++ b/drivers/clocksource/bcm2835_timer.c
@@ -95,23 +95,13 @@ static irqreturn_t bcm2835_time_interrupt(int irq, void *dev_id)
 	}
 }
 
-static struct of_device_id bcm2835_time_match[] __initconst = {
-	{ .compatible = "brcm,bcm2835-system-timer" },
-	{}
-};
-
-static void __init bcm2835_timer_init(void)
+static void __init bcm2835_timer_init(struct device_node *node)
 {
-	struct device_node *node;
 	void __iomem *base;
 	u32 freq;
 	int irq;
 	struct bcm2835_timer *timer;
 
-	node = of_find_matching_node(NULL, bcm2835_time_match);
-	if (!node)
-		panic("No bcm2835 timer node");
-
 	base = of_iomap(node, 0);
 	if (!base)
 		panic("Can't remap registers");
diff --git a/drivers/clocksource/cadence_ttc_timer.c b/drivers/clocksource/cadence_ttc_timer.c
new file mode 100644
index 00000000000..685bc60e210
--- /dev/null
+++ b/drivers/clocksource/cadence_ttc_timer.c
@@ -0,0 +1,436 @@
+/*
+ * This file contains driver for the Cadence Triple Timer Counter Rev 06
+ *
+ *  Copyright (C) 2011-2013 Xilinx
+ *
+ * based on arch/mips/kernel/time.c timer driver
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/clk.h>
+#include <linux/interrupt.h>
+#include <linux/clockchips.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/slab.h>
+#include <linux/clk-provider.h>
+
+/*
+ * This driver configures the 2 16-bit count-up timers as follows:
+ *
+ * T1: Timer 1, clocksource for generic timekeeping
+ * T2: Timer 2, clockevent source for hrtimers
+ * T3: Timer 3, <unused>
+ *
+ * The input frequency to the timer module for emulation is 2.5MHz which is
+ * common to all the timer channels (T1, T2, and T3). With a pre-scaler of 32,
+ * the timers are clocked at 78.125KHz (12.8 us resolution).
+
+ * The input frequency to the timer module in silicon is configurable and
+ * obtained from device tree. The pre-scaler of 32 is used.
+ */
+
+/*
+ * Timer Register Offset Definitions of Timer 1, Increment base address by 4
+ * and use same offsets for Timer 2
+ */
+#define TTC_CLK_CNTRL_OFFSET		0x00 /* Clock Control Reg, RW */
+#define TTC_CNT_CNTRL_OFFSET		0x0C /* Counter Control Reg, RW */
+#define TTC_COUNT_VAL_OFFSET		0x18 /* Counter Value Reg, RO */
+#define TTC_INTR_VAL_OFFSET		0x24 /* Interval Count Reg, RW */
+#define TTC_ISR_OFFSET		0x54 /* Interrupt Status Reg, RO */
+#define TTC_IER_OFFSET		0x60 /* Interrupt Enable Reg, RW */
+
+#define TTC_CNT_CNTRL_DISABLE_MASK	0x1
+
+/*
+ * Setup the timers to use pre-scaling, using a fixed value for now that will
+ * work across most input frequency, but it may need to be more dynamic
+ */
+#define PRESCALE_EXPONENT	11	/* 2 ^ PRESCALE_EXPONENT = PRESCALE */
+#define PRESCALE		2048	/* The exponent must match this */
+#define CLK_CNTRL_PRESCALE	((PRESCALE_EXPONENT - 1) << 1)
+#define CLK_CNTRL_PRESCALE_EN	1
+#define CNT_CNTRL_RESET		(1 << 4)
+
+/**
+ * struct ttc_timer - This definition defines local timer structure
+ *
+ * @base_addr:	Base address of timer
+ * @clk:	Associated clock source
+ * @clk_rate_change_nb	Notifier block for clock rate changes
+ */
+struct ttc_timer {
+	void __iomem *base_addr;
+	struct clk *clk;
+	struct notifier_block clk_rate_change_nb;
+};
+
+#define to_ttc_timer(x) \
+		container_of(x, struct ttc_timer, clk_rate_change_nb)
+
+struct ttc_timer_clocksource {
+	struct ttc_timer	ttc;
+	struct clocksource	cs;
+};
+
+#define to_ttc_timer_clksrc(x) \
+		container_of(x, struct ttc_timer_clocksource, cs)
+
+struct ttc_timer_clockevent {
+	struct ttc_timer		ttc;
+	struct clock_event_device	ce;
+};
+
+#define to_ttc_timer_clkevent(x) \
+		container_of(x, struct ttc_timer_clockevent, ce)
+
+/**
+ * ttc_set_interval - Set the timer interval value
+ *
+ * @timer:	Pointer to the timer instance
+ * @cycles:	Timer interval ticks
+ **/
+static void ttc_set_interval(struct ttc_timer *timer,
+					unsigned long cycles)
+{
+	u32 ctrl_reg;
+
+	/* Disable the counter, set the counter value  and re-enable counter */
+	ctrl_reg = __raw_readl(timer->base_addr + TTC_CNT_CNTRL_OFFSET);
+	ctrl_reg |= TTC_CNT_CNTRL_DISABLE_MASK;
+	__raw_writel(ctrl_reg, timer->base_addr + TTC_CNT_CNTRL_OFFSET);
+
+	__raw_writel(cycles, timer->base_addr + TTC_INTR_VAL_OFFSET);
+
+	/*
+	 * Reset the counter (0x10) so that it starts from 0, one-shot
+	 * mode makes this needed for timing to be right.
+	 */
+	ctrl_reg |= CNT_CNTRL_RESET;
+	ctrl_reg &= ~TTC_CNT_CNTRL_DISABLE_MASK;
+	__raw_writel(ctrl_reg, timer->base_addr + TTC_CNT_CNTRL_OFFSET);
+}
+
+/**
+ * ttc_clock_event_interrupt - Clock event timer interrupt handler
+ *
+ * @irq:	IRQ number of the Timer
+ * @dev_id:	void pointer to the ttc_timer instance
+ *
+ * returns: Always IRQ_HANDLED - success
+ **/
+static irqreturn_t ttc_clock_event_interrupt(int irq, void *dev_id)
+{
+	struct ttc_timer_clockevent *ttce = dev_id;
+	struct ttc_timer *timer = &ttce->ttc;
+
+	/* Acknowledge the interrupt and call event handler */
+	__raw_readl(timer->base_addr + TTC_ISR_OFFSET);
+
+	ttce->ce.event_handler(&ttce->ce);
+
+	return IRQ_HANDLED;
+}
+
+/**
+ * __ttc_clocksource_read - Reads the timer counter register
+ *
+ * returns: Current timer counter register value
+ **/
+static cycle_t __ttc_clocksource_read(struct clocksource *cs)
+{
+	struct ttc_timer *timer = &to_ttc_timer_clksrc(cs)->ttc;
+
+	return (cycle_t)__raw_readl(timer->base_addr +
+				TTC_COUNT_VAL_OFFSET);
+}
+
+/**
+ * ttc_set_next_event - Sets the time interval for next event
+ *
+ * @cycles:	Timer interval ticks
+ * @evt:	Address of clock event instance
+ *
+ * returns: Always 0 - success
+ **/
+static int ttc_set_next_event(unsigned long cycles,
+					struct clock_event_device *evt)
+{
+	struct ttc_timer_clockevent *ttce = to_ttc_timer_clkevent(evt);
+	struct ttc_timer *timer = &ttce->ttc;
+
+	ttc_set_interval(timer, cycles);
+	return 0;
+}
+
+/**
+ * ttc_set_mode - Sets the mode of timer
+ *
+ * @mode:	Mode to be set
+ * @evt:	Address of clock event instance
+ **/
+static void ttc_set_mode(enum clock_event_mode mode,
+					struct clock_event_device *evt)
+{
+	struct ttc_timer_clockevent *ttce = to_ttc_timer_clkevent(evt);
+	struct ttc_timer *timer = &ttce->ttc;
+	u32 ctrl_reg;
+
+	switch (mode) {
+	case CLOCK_EVT_MODE_PERIODIC:
+		ttc_set_interval(timer,
+				DIV_ROUND_CLOSEST(clk_get_rate(ttce->ttc.clk),
+					PRESCALE * HZ));
+		break;
+	case CLOCK_EVT_MODE_ONESHOT:
+	case CLOCK_EVT_MODE_UNUSED:
+	case CLOCK_EVT_MODE_SHUTDOWN:
+		ctrl_reg = __raw_readl(timer->base_addr +
+					TTC_CNT_CNTRL_OFFSET);
+		ctrl_reg |= TTC_CNT_CNTRL_DISABLE_MASK;
+		__raw_writel(ctrl_reg,
+				timer->base_addr + TTC_CNT_CNTRL_OFFSET);
+		break;
+	case CLOCK_EVT_MODE_RESUME:
+		ctrl_reg = __raw_readl(timer->base_addr +
+					TTC_CNT_CNTRL_OFFSET);
+		ctrl_reg &= ~TTC_CNT_CNTRL_DISABLE_MASK;
+		__raw_writel(ctrl_reg,
+				timer->base_addr + TTC_CNT_CNTRL_OFFSET);
+		break;
+	}
+}
+
+static int ttc_rate_change_clocksource_cb(struct notifier_block *nb,
+		unsigned long event, void *data)
+{
+	struct clk_notifier_data *ndata = data;
+	struct ttc_timer *ttc = to_ttc_timer(nb);
+	struct ttc_timer_clocksource *ttccs = container_of(ttc,
+			struct ttc_timer_clocksource, ttc);
+
+	switch (event) {
+	case POST_RATE_CHANGE:
+		/*
+		 * Do whatever is necessary to maintain a proper time base
+		 *
+		 * I cannot find a way to adjust the currently used clocksource
+		 * to the new frequency. __clocksource_updatefreq_hz() sounds
+		 * good, but does not work. Not sure what's that missing.
+		 *
+		 * This approach works, but triggers two clocksource switches.
+		 * The first after unregister to clocksource jiffies. And
+		 * another one after the register to the newly registered timer.
+		 *
+		 * Alternatively we could 'waste' another HW timer to ping pong
+		 * between clock sources. That would also use one register and
+		 * one unregister call, but only trigger one clocksource switch
+		 * for the cost of another HW timer used by the OS.
+		 */
+		clocksource_unregister(&ttccs->cs);
+		clocksource_register_hz(&ttccs->cs,
+				ndata->new_rate / PRESCALE);
+		/* fall through */
+	case PRE_RATE_CHANGE:
+	case ABORT_RATE_CHANGE:
+	default:
+		return NOTIFY_DONE;
+	}
+}
+
+static void __init ttc_setup_clocksource(struct clk *clk, void __iomem *base)
+{
+	struct ttc_timer_clocksource *ttccs;
+	int err;
+
+	ttccs = kzalloc(sizeof(*ttccs), GFP_KERNEL);
+	if (WARN_ON(!ttccs))
+		return;
+
+	ttccs->ttc.clk = clk;
+
+	err = clk_prepare_enable(ttccs->ttc.clk);
+	if (WARN_ON(err)) {
+		kfree(ttccs);
+		return;
+	}
+
+	ttccs->ttc.clk_rate_change_nb.notifier_call =
+		ttc_rate_change_clocksource_cb;
+	ttccs->ttc.clk_rate_change_nb.next = NULL;
+	if (clk_notifier_register(ttccs->ttc.clk,
+				&ttccs->ttc.clk_rate_change_nb))
+		pr_warn("Unable to register clock notifier.\n");
+
+	ttccs->ttc.base_addr = base;
+	ttccs->cs.name = "ttc_clocksource";
+	ttccs->cs.rating = 200;
+	ttccs->cs.read = __ttc_clocksource_read;
+	ttccs->cs.mask = CLOCKSOURCE_MASK(16);
+	ttccs->cs.flags = CLOCK_SOURCE_IS_CONTINUOUS;
+
+	/*
+	 * Setup the clock source counter to be an incrementing counter
+	 * with no interrupt and it rolls over at 0xFFFF. Pre-scale
+	 * it by 32 also. Let it start running now.
+	 */
+	__raw_writel(0x0,  ttccs->ttc.base_addr + TTC_IER_OFFSET);
+	__raw_writel(CLK_CNTRL_PRESCALE | CLK_CNTRL_PRESCALE_EN,
+		     ttccs->ttc.base_addr + TTC_CLK_CNTRL_OFFSET);
+	__raw_writel(CNT_CNTRL_RESET,
+		     ttccs->ttc.base_addr + TTC_CNT_CNTRL_OFFSET);
+
+	err = clocksource_register_hz(&ttccs->cs,
+			clk_get_rate(ttccs->ttc.clk) / PRESCALE);
+	if (WARN_ON(err)) {
+		kfree(ttccs);
+		return;
+	}
+}
+
+static int ttc_rate_change_clockevent_cb(struct notifier_block *nb,
+		unsigned long event, void *data)
+{
+	struct clk_notifier_data *ndata = data;
+	struct ttc_timer *ttc = to_ttc_timer(nb);
+	struct ttc_timer_clockevent *ttcce = container_of(ttc,
+			struct ttc_timer_clockevent, ttc);
+
+	switch (event) {
+	case POST_RATE_CHANGE:
+	{
+		unsigned long flags;
+
+		/*
+		 * clockevents_update_freq should be called with IRQ disabled on
+		 * the CPU the timer provides events for. The timer we use is
+		 * common to both CPUs, not sure if we need to run on both
+		 * cores.
+		 */
+		local_irq_save(flags);
+		clockevents_update_freq(&ttcce->ce,
+				ndata->new_rate / PRESCALE);
+		local_irq_restore(flags);
+
+		/* fall through */
+	}
+	case PRE_RATE_CHANGE:
+	case ABORT_RATE_CHANGE:
+	default:
+		return NOTIFY_DONE;
+	}
+}
+
+static void __init ttc_setup_clockevent(struct clk *clk,
+						void __iomem *base, u32 irq)
+{
+	struct ttc_timer_clockevent *ttcce;
+	int err;
+
+	ttcce = kzalloc(sizeof(*ttcce), GFP_KERNEL);
+	if (WARN_ON(!ttcce))
+		return;
+
+	ttcce->ttc.clk = clk;
+
+	err = clk_prepare_enable(ttcce->ttc.clk);
+	if (WARN_ON(err)) {
+		kfree(ttcce);
+		return;
+	}
+
+	ttcce->ttc.clk_rate_change_nb.notifier_call =
+		ttc_rate_change_clockevent_cb;
+	ttcce->ttc.clk_rate_change_nb.next = NULL;
+	if (clk_notifier_register(ttcce->ttc.clk,
+				&ttcce->ttc.clk_rate_change_nb))
+		pr_warn("Unable to register clock notifier.\n");
+
+	ttcce->ttc.base_addr = base;
+	ttcce->ce.name = "ttc_clockevent";
+	ttcce->ce.features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT;
+	ttcce->ce.set_next_event = ttc_set_next_event;
+	ttcce->ce.set_mode = ttc_set_mode;
+	ttcce->ce.rating = 200;
+	ttcce->ce.irq = irq;
+	ttcce->ce.cpumask = cpu_possible_mask;
+
+	/*
+	 * Setup the clock event timer to be an interval timer which
+	 * is prescaled by 32 using the interval interrupt. Leave it
+	 * disabled for now.
+	 */
+	__raw_writel(0x23, ttcce->ttc.base_addr + TTC_CNT_CNTRL_OFFSET);
+	__raw_writel(CLK_CNTRL_PRESCALE | CLK_CNTRL_PRESCALE_EN,
+		     ttcce->ttc.base_addr + TTC_CLK_CNTRL_OFFSET);
+	__raw_writel(0x1,  ttcce->ttc.base_addr + TTC_IER_OFFSET);
+
+	err = request_irq(irq, ttc_clock_event_interrupt,
+			  IRQF_DISABLED | IRQF_TIMER,
+			  ttcce->ce.name, ttcce);
+	if (WARN_ON(err)) {
+		kfree(ttcce);
+		return;
+	}
+
+	clockevents_config_and_register(&ttcce->ce,
+			clk_get_rate(ttcce->ttc.clk) / PRESCALE, 1, 0xfffe);
+}
+
+/**
+ * ttc_timer_init - Initialize the timer
+ *
+ * Initializes the timer hardware and register the clock source and clock event
+ * timers with Linux kernal timer framework
+ */
+static void __init ttc_timer_init(struct device_node *timer)
+{
+	unsigned int irq;
+	void __iomem *timer_baseaddr;
+	struct clk *clk;
+	static int initialized;
+
+	if (initialized)
+		return;
+
+	initialized = 1;
+
+	/*
+	 * Get the 1st Triple Timer Counter (TTC) block from the device tree
+	 * and use it. Note that the event timer uses the interrupt and it's the
+	 * 2nd TTC hence the irq_of_parse_and_map(,1)
+	 */
+	timer_baseaddr = of_iomap(timer, 0);
+	if (!timer_baseaddr) {
+		pr_err("ERROR: invalid timer base address\n");
+		BUG();
+	}
+
+	irq = irq_of_parse_and_map(timer, 1);
+	if (irq <= 0) {
+		pr_err("ERROR: invalid interrupt number\n");
+		BUG();
+	}
+
+	clk = of_clk_get_by_name(timer, "cpu_1x");
+	if (IS_ERR(clk)) {
+		pr_err("ERROR: timer input clock not found\n");
+		BUG();
+	}
+
+	ttc_setup_clocksource(clk, timer_baseaddr);
+	ttc_setup_clockevent(clk, timer_baseaddr + 4, irq);
+
+	pr_info("%s #0 at %p, irq=%d\n", timer->name, timer_baseaddr, irq);
+}
+
+CLOCKSOURCE_OF_DECLARE(ttc, "cdns,ttc", ttc_timer_init);
diff --git a/drivers/clocksource/clksrc-of.c b/drivers/clocksource/clksrc-of.c
index bdabdaa8d00..37f5325bec9 100644
--- a/drivers/clocksource/clksrc-of.c
+++ b/drivers/clocksource/clksrc-of.c
@@ -16,6 +16,7 @@
 
 #include <linux/init.h>
 #include <linux/of.h>
+#include <linux/clocksource.h>
 
 extern struct of_device_id __clksrc_of_table[];
 
@@ -26,10 +27,10 @@ void __init clocksource_of_init(void)
 {
 	struct device_node *np;
 	const struct of_device_id *match;
-	void (*init_func)(void);
+	clocksource_of_init_fn init_func;
 
 	for_each_matching_node_and_match(np, __clksrc_of_table, &match) {
 		init_func = match->data;
-		init_func();
+		init_func(np);
 	}
 }
diff --git a/drivers/clocksource/em_sti.c b/drivers/clocksource/em_sti.c
index e6a553cb73e..4329a29a531 100644
--- a/drivers/clocksource/em_sti.c
+++ b/drivers/clocksource/em_sti.c
@@ -399,7 +399,18 @@ static struct platform_driver em_sti_device_driver = {
 	}
 };
 
-module_platform_driver(em_sti_device_driver);
+static int __init em_sti_init(void)
+{
+	return platform_driver_register(&em_sti_device_driver);
+}
+
+static void __exit em_sti_exit(void)
+{
+	platform_driver_unregister(&em_sti_device_driver);
+}
+
+subsys_initcall(em_sti_init);
+module_exit(em_sti_exit);
 
 MODULE_AUTHOR("Magnus Damm");
 MODULE_DESCRIPTION("Renesas Emma Mobile STI Timer Driver");
diff --git a/drivers/clocksource/exynos_mct.c b/drivers/clocksource/exynos_mct.c
index d3f1327d1ac..957af8636c9 100644
--- a/drivers/clocksource/exynos_mct.c
+++ b/drivers/clocksource/exynos_mct.c
@@ -477,14 +477,14 @@ static struct local_timer_ops exynos4_mct_tick_ops __cpuinitdata = {
 };
 #endif /* CONFIG_LOCAL_TIMERS */
 
-static void __init exynos4_timer_resources(struct device_node *np)
+static void __init exynos4_timer_resources(void __iomem *base)
 {
 	struct clk *mct_clk;
 	mct_clk = clk_get(NULL, "xtal");
 
 	clk_rate = clk_get_rate(mct_clk);
 
-	reg_base = np ? of_iomap(np, 0) : S5P_VA_SYSTIMER;
+	reg_base = base;
 	if (!reg_base)
 		panic("%s: unable to ioremap mct address space\n", __func__);
 
@@ -503,38 +503,9 @@ static void __init exynos4_timer_resources(struct device_node *np)
 #endif /* CONFIG_LOCAL_TIMERS */
 }
 
-static const struct of_device_id exynos_mct_ids[] = {
-	{ .compatible = "samsung,exynos4210-mct", .data = (void *)MCT_INT_SPI },
-	{ .compatible = "samsung,exynos4412-mct", .data = (void *)MCT_INT_PPI },
-	{ }
-};
-
 void __init mct_init(void)
 {
-	struct device_node *np = NULL;
-	const struct of_device_id *match;
-	u32 nr_irqs, i;
-
-#ifdef CONFIG_OF
-	np = of_find_matching_node_and_match(NULL, exynos_mct_ids, &match);
-#endif
-	if (np) {
-		mct_int_type = (u32)(match->data);
-
-		/* This driver uses only one global timer interrupt */
-		mct_irqs[MCT_G0_IRQ] = irq_of_parse_and_map(np, MCT_G0_IRQ);
-
-		/*
-		 * Find out the number of local irqs specified. The local
-		 * timer irqs are specified after the four global timer
-		 * irqs are specified.
-		 */
-#ifdef CONFIG_OF
-		nr_irqs = of_irq_count(np);
-#endif
-		for (i = MCT_L0_IRQ; i < nr_irqs; i++)
-			mct_irqs[i] = irq_of_parse_and_map(np, i);
-	} else if (soc_is_exynos4210()) {
+	if (soc_is_exynos4210()) {
 		mct_irqs[MCT_G0_IRQ] = EXYNOS4_IRQ_MCT_G0;
 		mct_irqs[MCT_L0_IRQ] = EXYNOS4_IRQ_MCT_L0;
 		mct_irqs[MCT_L1_IRQ] = EXYNOS4_IRQ_MCT_L1;
@@ -543,9 +514,43 @@ void __init mct_init(void)
 		panic("unable to determine mct controller type\n");
 	}
 
-	exynos4_timer_resources(np);
+	exynos4_timer_resources(S5P_VA_SYSTIMER);
 	exynos4_clocksource_init();
 	exynos4_clockevent_init();
 }
-CLOCKSOURCE_OF_DECLARE(exynos4210, "samsung,exynos4210-mct", mct_init);
-CLOCKSOURCE_OF_DECLARE(exynos4412, "samsung,exynos4412-mct", mct_init);
+
+static void __init mct_init_dt(struct device_node *np, unsigned int int_type)
+{
+	u32 nr_irqs, i;
+
+	mct_int_type = int_type;
+
+	/* This driver uses only one global timer interrupt */
+	mct_irqs[MCT_G0_IRQ] = irq_of_parse_and_map(np, MCT_G0_IRQ);
+
+	/*
+	 * Find out the number of local irqs specified. The local
+	 * timer irqs are specified after the four global timer
+	 * irqs are specified.
+	 */
+	nr_irqs = of_irq_count(np);
+	for (i = MCT_L0_IRQ; i < nr_irqs; i++)
+		mct_irqs[i] = irq_of_parse_and_map(np, i);
+
+	exynos4_timer_resources(of_iomap(np, 0));
+	exynos4_clocksource_init();
+	exynos4_clockevent_init();
+}
+
+
+static void __init mct_init_spi(struct device_node *np)
+{
+	return mct_init_dt(np, MCT_INT_SPI);
+}
+
+static void __init mct_init_ppi(struct device_node *np)
+{
+	return mct_init_dt(np, MCT_INT_PPI);
+}
+CLOCKSOURCE_OF_DECLARE(exynos4210, "samsung,exynos4210-mct", mct_init_spi);
+CLOCKSOURCE_OF_DECLARE(exynos4412, "samsung,exynos4412-mct", mct_init_ppi);
diff --git a/drivers/clocksource/sh_cmt.c b/drivers/clocksource/sh_cmt.c
index 488c14cc8db..08d0c418c94 100644
--- a/drivers/clocksource/sh_cmt.c
+++ b/drivers/clocksource/sh_cmt.c
@@ -54,62 +54,100 @@ struct sh_cmt_priv {
 	struct clocksource cs;
 	unsigned long total_cycles;
 	bool cs_enabled;
+
+	/* callbacks for CMSTR and CMCSR access */
+	unsigned long (*read_control)(void __iomem *base, unsigned long offs);
+	void (*write_control)(void __iomem *base, unsigned long offs,
+			      unsigned long value);
+
+	/* callbacks for CMCNT and CMCOR access */
+	unsigned long (*read_count)(void __iomem *base, unsigned long offs);
+	void (*write_count)(void __iomem *base, unsigned long offs,
+			    unsigned long value);
 };
 
-static DEFINE_RAW_SPINLOCK(sh_cmt_lock);
+/* Examples of supported CMT timer register layouts and I/O access widths:
+ *
+ * "16-bit counter and 16-bit control" as found on sh7263:
+ * CMSTR 0xfffec000 16-bit
+ * CMCSR 0xfffec002 16-bit
+ * CMCNT 0xfffec004 16-bit
+ * CMCOR 0xfffec006 16-bit
+ *
+ * "32-bit counter and 16-bit control" as found on sh7372, sh73a0, r8a7740:
+ * CMSTR 0xffca0000 16-bit
+ * CMCSR 0xffca0060 16-bit
+ * CMCNT 0xffca0064 32-bit
+ * CMCOR 0xffca0068 32-bit
+ */
+
+static unsigned long sh_cmt_read16(void __iomem *base, unsigned long offs)
+{
+	return ioread16(base + (offs << 1));
+}
+
+static unsigned long sh_cmt_read32(void __iomem *base, unsigned long offs)
+{
+	return ioread32(base + (offs << 2));
+}
+
+static void sh_cmt_write16(void __iomem *base, unsigned long offs,
+			   unsigned long value)
+{
+	iowrite16(value, base + (offs << 1));
+}
+
+static void sh_cmt_write32(void __iomem *base, unsigned long offs,
+			   unsigned long value)
+{
+	iowrite32(value, base + (offs << 2));
+}
 
-#define CMSTR -1 /* shared register */
 #define CMCSR 0 /* channel register */
 #define CMCNT 1 /* channel register */
 #define CMCOR 2 /* channel register */
 
-static inline unsigned long sh_cmt_read(struct sh_cmt_priv *p, int reg_nr)
+static inline unsigned long sh_cmt_read_cmstr(struct sh_cmt_priv *p)
 {
 	struct sh_timer_config *cfg = p->pdev->dev.platform_data;
-	void __iomem *base = p->mapbase;
-	unsigned long offs;
-
-	if (reg_nr == CMSTR) {
-		offs = 0;
-		base -= cfg->channel_offset;
-	} else
-		offs = reg_nr;
-
-	if (p->width == 16)
-		offs <<= 1;
-	else {
-		offs <<= 2;
-		if ((reg_nr == CMCNT) || (reg_nr == CMCOR))
-			return ioread32(base + offs);
-	}
 
-	return ioread16(base + offs);
+	return p->read_control(p->mapbase - cfg->channel_offset, 0);
 }
 
-static inline void sh_cmt_write(struct sh_cmt_priv *p, int reg_nr,
-				unsigned long value)
+static inline unsigned long sh_cmt_read_cmcsr(struct sh_cmt_priv *p)
+{
+	return p->read_control(p->mapbase, CMCSR);
+}
+
+static inline unsigned long sh_cmt_read_cmcnt(struct sh_cmt_priv *p)
+{
+	return p->read_count(p->mapbase, CMCNT);
+}
+
+static inline void sh_cmt_write_cmstr(struct sh_cmt_priv *p,
+				      unsigned long value)
 {
 	struct sh_timer_config *cfg = p->pdev->dev.platform_data;
-	void __iomem *base = p->mapbase;
-	unsigned long offs;
-
-	if (reg_nr == CMSTR) {
-		offs = 0;
-		base -= cfg->channel_offset;
-	} else
-		offs = reg_nr;
-
-	if (p->width == 16)
-		offs <<= 1;
-	else {
-		offs <<= 2;
-		if ((reg_nr == CMCNT) || (reg_nr == CMCOR)) {
-			iowrite32(value, base + offs);
-			return;
-		}
-	}
 
-	iowrite16(value, base + offs);
+	p->write_control(p->mapbase - cfg->channel_offset, 0, value);
+}
+
+static inline void sh_cmt_write_cmcsr(struct sh_cmt_priv *p,
+				      unsigned long value)
+{
+	p->write_control(p->mapbase, CMCSR, value);
+}
+
+static inline void sh_cmt_write_cmcnt(struct sh_cmt_priv *p,
+				      unsigned long value)
+{
+	p->write_count(p->mapbase, CMCNT, value);
+}
+
+static inline void sh_cmt_write_cmcor(struct sh_cmt_priv *p,
+				      unsigned long value)
+{
+	p->write_count(p->mapbase, CMCOR, value);
 }
 
 static unsigned long sh_cmt_get_counter(struct sh_cmt_priv *p,
@@ -118,15 +156,15 @@ static unsigned long sh_cmt_get_counter(struct sh_cmt_priv *p,
 	unsigned long v1, v2, v3;
 	int o1, o2;
 
-	o1 = sh_cmt_read(p, CMCSR) & p->overflow_bit;
+	o1 = sh_cmt_read_cmcsr(p) & p->overflow_bit;
 
 	/* Make sure the timer value is stable. Stolen from acpi_pm.c */
 	do {
 		o2 = o1;
-		v1 = sh_cmt_read(p, CMCNT);
-		v2 = sh_cmt_read(p, CMCNT);
-		v3 = sh_cmt_read(p, CMCNT);
-		o1 = sh_cmt_read(p, CMCSR) & p->overflow_bit;
+		v1 = sh_cmt_read_cmcnt(p);
+		v2 = sh_cmt_read_cmcnt(p);
+		v3 = sh_cmt_read_cmcnt(p);
+		o1 = sh_cmt_read_cmcsr(p) & p->overflow_bit;
 	} while (unlikely((o1 != o2) || (v1 > v2 && v1 < v3)
 			  || (v2 > v3 && v2 < v1) || (v3 > v1 && v3 < v2)));
 
@@ -134,6 +172,7 @@ static unsigned long sh_cmt_get_counter(struct sh_cmt_priv *p,
 	return v2;
 }
 
+static DEFINE_RAW_SPINLOCK(sh_cmt_lock);
 
 static void sh_cmt_start_stop_ch(struct sh_cmt_priv *p, int start)
 {
@@ -142,14 +181,14 @@ static void sh_cmt_start_stop_ch(struct sh_cmt_priv *p, int start)
 
 	/* start stop register shared by multiple timer channels */
 	raw_spin_lock_irqsave(&sh_cmt_lock, flags);
-	value = sh_cmt_read(p, CMSTR);
+	value = sh_cmt_read_cmstr(p);
 
 	if (start)
 		value |= 1 << cfg->timer_bit;
 	else
 		value &= ~(1 << cfg->timer_bit);
 
-	sh_cmt_write(p, CMSTR, value);
+	sh_cmt_write_cmstr(p, value);
 	raw_spin_unlock_irqrestore(&sh_cmt_lock, flags);
 }
 
@@ -173,14 +212,14 @@ static int sh_cmt_enable(struct sh_cmt_priv *p, unsigned long *rate)
 	/* configure channel, periodic mode and maximum timeout */
 	if (p->width == 16) {
 		*rate = clk_get_rate(p->clk) / 512;
-		sh_cmt_write(p, CMCSR, 0x43);
+		sh_cmt_write_cmcsr(p, 0x43);
 	} else {
 		*rate = clk_get_rate(p->clk) / 8;
-		sh_cmt_write(p, CMCSR, 0x01a4);
+		sh_cmt_write_cmcsr(p, 0x01a4);
 	}
 
-	sh_cmt_write(p, CMCOR, 0xffffffff);
-	sh_cmt_write(p, CMCNT, 0);
+	sh_cmt_write_cmcor(p, 0xffffffff);
+	sh_cmt_write_cmcnt(p, 0);
 
 	/*
 	 * According to the sh73a0 user's manual, as CMCNT can be operated
@@ -194,12 +233,12 @@ static int sh_cmt_enable(struct sh_cmt_priv *p, unsigned long *rate)
 	 * take RCLKx2 at maximum.
 	 */
 	for (k = 0; k < 100; k++) {
-		if (!sh_cmt_read(p, CMCNT))
+		if (!sh_cmt_read_cmcnt(p))
 			break;
 		udelay(1);
 	}
 
-	if (sh_cmt_read(p, CMCNT)) {
+	if (sh_cmt_read_cmcnt(p)) {
 		dev_err(&p->pdev->dev, "cannot clear CMCNT\n");
 		ret = -ETIMEDOUT;
 		goto err1;
@@ -222,7 +261,7 @@ static void sh_cmt_disable(struct sh_cmt_priv *p)
 	sh_cmt_start_stop_ch(p, 0);
 
 	/* disable interrupts in CMT block */
-	sh_cmt_write(p, CMCSR, 0);
+	sh_cmt_write_cmcsr(p, 0);
 
 	/* stop clock */
 	clk_disable(p->clk);
@@ -270,7 +309,7 @@ static void sh_cmt_clock_event_program_verify(struct sh_cmt_priv *p,
 		if (new_match > p->max_match_value)
 			new_match = p->max_match_value;
 
-		sh_cmt_write(p, CMCOR, new_match);
+		sh_cmt_write_cmcor(p, new_match);
 
 		now = sh_cmt_get_counter(p, &has_wrapped);
 		if (has_wrapped && (new_match > p->match_value)) {
@@ -346,7 +385,7 @@ static irqreturn_t sh_cmt_interrupt(int irq, void *dev_id)
 	struct sh_cmt_priv *p = dev_id;
 
 	/* clear flags */
-	sh_cmt_write(p, CMCSR, sh_cmt_read(p, CMCSR) & p->clear_bits);
+	sh_cmt_write_cmcsr(p, sh_cmt_read_cmcsr(p) & p->clear_bits);
 
 	/* update clock source counter to begin with if enabled
 	 * the wrap flag should be cleared by the timer specific
@@ -625,14 +664,6 @@ static int sh_cmt_register(struct sh_cmt_priv *p, char *name,
 			   unsigned long clockevent_rating,
 			   unsigned long clocksource_rating)
 {
-	if (p->width == (sizeof(p->max_match_value) * 8))
-		p->max_match_value = ~0;
-	else
-		p->max_match_value = (1 << p->width) - 1;
-
-	p->match_value = p->max_match_value;
-	raw_spin_lock_init(&p->lock);
-
 	if (clockevent_rating)
 		sh_cmt_register_clockevent(p, name, clockevent_rating);
 
@@ -657,8 +688,6 @@ static int sh_cmt_setup(struct sh_cmt_priv *p, struct platform_device *pdev)
 		goto err0;
 	}
 
-	platform_set_drvdata(pdev, p);
-
 	res = platform_get_resource(p->pdev, IORESOURCE_MEM, 0);
 	if (!res) {
 		dev_err(&p->pdev->dev, "failed to get I/O memory\n");
@@ -693,32 +722,51 @@ static int sh_cmt_setup(struct sh_cmt_priv *p, struct platform_device *pdev)
 		goto err1;
 	}
 
+	p->read_control = sh_cmt_read16;
+	p->write_control = sh_cmt_write16;
+
 	if (resource_size(res) == 6) {
 		p->width = 16;
+		p->read_count = sh_cmt_read16;
+		p->write_count = sh_cmt_write16;
 		p->overflow_bit = 0x80;
 		p->clear_bits = ~0x80;
 	} else {
 		p->width = 32;
+		p->read_count = sh_cmt_read32;
+		p->write_count = sh_cmt_write32;
 		p->overflow_bit = 0x8000;
 		p->clear_bits = ~0xc000;
 	}
 
+	if (p->width == (sizeof(p->max_match_value) * 8))
+		p->max_match_value = ~0;
+	else
+		p->max_match_value = (1 << p->width) - 1;
+
+	p->match_value = p->max_match_value;
+	raw_spin_lock_init(&p->lock);
+
 	ret = sh_cmt_register(p, (char *)dev_name(&p->pdev->dev),
 			      cfg->clockevent_rating,
 			      cfg->clocksource_rating);
 	if (ret) {
 		dev_err(&p->pdev->dev, "registration failed\n");
-		goto err1;
+		goto err2;
 	}
 	p->cs_enabled = false;
 
 	ret = setup_irq(irq, &p->irqaction);
 	if (ret) {
 		dev_err(&p->pdev->dev, "failed to request irq %d\n", irq);
-		goto err1;
+		goto err2;
 	}
 
+	platform_set_drvdata(pdev, p);
+
 	return 0;
+err2:
+	clk_put(p->clk);
 
 err1:
 	iounmap(p->mapbase);
@@ -751,7 +799,6 @@ static int sh_cmt_probe(struct platform_device *pdev)
 	ret = sh_cmt_setup(p, pdev);
 	if (ret) {
 		kfree(p);
-		platform_set_drvdata(pdev, NULL);
 		pm_runtime_idle(&pdev->dev);
 		return ret;
 	}
@@ -791,7 +838,7 @@ static void __exit sh_cmt_exit(void)
 }
 
 early_platform_init("earlytimer", &sh_cmt_device_driver);
-module_init(sh_cmt_init);
+subsys_initcall(sh_cmt_init);
 module_exit(sh_cmt_exit);
 
 MODULE_AUTHOR("Magnus Damm");
diff --git a/drivers/clocksource/sh_mtu2.c b/drivers/clocksource/sh_mtu2.c
index 83943e27cfa..4aac9ee0d0c 100644
--- a/drivers/clocksource/sh_mtu2.c
+++ b/drivers/clocksource/sh_mtu2.c
@@ -386,7 +386,7 @@ static void __exit sh_mtu2_exit(void)
 }
 
 early_platform_init("earlytimer", &sh_mtu2_device_driver);
-module_init(sh_mtu2_init);
+subsys_initcall(sh_mtu2_init);
 module_exit(sh_mtu2_exit);
 
 MODULE_AUTHOR("Magnus Damm");
diff --git a/drivers/clocksource/sh_tmu.c b/drivers/clocksource/sh_tmu.c
index b4502edce2a..78b8dae4962 100644
--- a/drivers/clocksource/sh_tmu.c
+++ b/drivers/clocksource/sh_tmu.c
@@ -549,7 +549,7 @@ static void __exit sh_tmu_exit(void)
 }
 
 early_platform_init("earlytimer", &sh_tmu_device_driver);
-module_init(sh_tmu_init);
+subsys_initcall(sh_tmu_init);
 module_exit(sh_tmu_exit);
 
 MODULE_AUTHOR("Magnus Damm");
diff --git a/drivers/clocksource/sunxi_timer.c b/drivers/clocksource/sunxi_timer.c
index 4086b916715..0ce85e29769 100644
--- a/drivers/clocksource/sunxi_timer.c
+++ b/drivers/clocksource/sunxi_timer.c
@@ -23,7 +23,7 @@
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
 #include <linux/sunxi_timer.h>
-#include <linux/clk-provider.h>
+#include <linux/clk/sunxi.h>
 
 #define TIMER_CTL_REG		0x00
 #define TIMER_CTL_ENABLE		(1 << 0)
@@ -123,7 +123,7 @@ void __init sunxi_timer_init(void)
 	if (irq <= 0)
 		panic("Can't parse IRQ");
 
-	of_clk_init(NULL);
+	sunxi_init_clocks();
 
 	clk = of_clk_get(node, 0);
 	if (IS_ERR(clk))
diff --git a/drivers/clocksource/tegra20_timer.c b/drivers/clocksource/tegra20_timer.c
index 0bde03feb09..ae877b021b5 100644
--- a/drivers/clocksource/tegra20_timer.c
+++ b/drivers/clocksource/tegra20_timer.c
@@ -154,29 +154,12 @@ static struct irqaction tegra_timer_irq = {
 	.dev_id		= &tegra_clockevent,
 };
 
-static const struct of_device_id timer_match[] __initconst = {
-	{ .compatible = "nvidia,tegra20-timer" },
-	{}
-};
-
-static const struct of_device_id rtc_match[] __initconst = {
-	{ .compatible = "nvidia,tegra20-rtc" },
-	{}
-};
-
-static void __init tegra20_init_timer(void)
+static void __init tegra20_init_timer(struct device_node *np)
 {
-	struct device_node *np;
 	struct clk *clk;
 	unsigned long rate;
 	int ret;
 
-	np = of_find_matching_node(NULL, timer_match);
-	if (!np) {
-		pr_err("Failed to find timer DT node\n");
-		BUG();
-	}
-
 	timer_reg_base = of_iomap(np, 0);
 	if (!timer_reg_base) {
 		pr_err("Can't map timer registers\n");
@@ -189,7 +172,7 @@ static void __init tegra20_init_timer(void)
 		BUG();
 	}
 
-	clk = clk_get_sys("timer", NULL);
+	clk = of_clk_get(np, 0);
 	if (IS_ERR(clk)) {
 		pr_warn("Unable to get timer clock. Assuming 12Mhz input clock.\n");
 		rate = 12000000;
@@ -200,30 +183,6 @@ static void __init tegra20_init_timer(void)
 
 	of_node_put(np);
 
-	np = of_find_matching_node(NULL, rtc_match);
-	if (!np) {
-		pr_err("Failed to find RTC DT node\n");
-		BUG();
-	}
-
-	rtc_base = of_iomap(np, 0);
-	if (!rtc_base) {
-		pr_err("Can't map RTC registers");
-		BUG();
-	}
-
-	/*
-	 * rtc registers are used by read_persistent_clock, keep the rtc clock
-	 * enabled
-	 */
-	clk = clk_get_sys("rtc-tegra", NULL);
-	if (IS_ERR(clk))
-		pr_warn("Unable to get rtc-tegra clock\n");
-	else
-		clk_prepare_enable(clk);
-
-	of_node_put(np);
-
 	switch (rate) {
 	case 12000000:
 		timer_writel(0x000b, TIMERUS_USEC_CFG);
@@ -259,12 +218,34 @@ static void __init tegra20_init_timer(void)
 	tegra_clockevent.irq = tegra_timer_irq.irq;
 	clockevents_config_and_register(&tegra_clockevent, 1000000,
 					0x1, 0x1fffffff);
-#ifdef CONFIG_HAVE_ARM_TWD
-	twd_local_timer_of_register();
-#endif
+}
+CLOCKSOURCE_OF_DECLARE(tegra20_timer, "nvidia,tegra20-timer", tegra20_init_timer);
+
+static void __init tegra20_init_rtc(struct device_node *np)
+{
+	struct clk *clk;
+
+	rtc_base = of_iomap(np, 0);
+	if (!rtc_base) {
+		pr_err("Can't map RTC registers");
+		BUG();
+	}
+
+	/*
+	 * rtc registers are used by read_persistent_clock, keep the rtc clock
+	 * enabled
+	 */
+	clk = of_clk_get(np, 0);
+	if (IS_ERR(clk))
+		pr_warn("Unable to get rtc-tegra clock\n");
+	else
+		clk_prepare_enable(clk);
+
+	of_node_put(np);
+
 	register_persistent_clock(NULL, tegra_read_persistent_clock);
 }
-CLOCKSOURCE_OF_DECLARE(tegra20, "nvidia,tegra20-timer", tegra20_init_timer);
+CLOCKSOURCE_OF_DECLARE(tegra20_rtc, "nvidia,tegra20-rtc", tegra20_init_rtc);
 
 #ifdef CONFIG_PM
 static u32 usec_config;
diff --git a/drivers/clocksource/vt8500_timer.c b/drivers/clocksource/vt8500_timer.c
index 8efc86b5b5d..64f553f04fa 100644
--- a/drivers/clocksource/vt8500_timer.c
+++ b/drivers/clocksource/vt8500_timer.c
@@ -129,22 +129,10 @@ static struct irqaction irq = {
 	.dev_id  = &clockevent,
 };
 
-static struct of_device_id vt8500_timer_ids[] = {
-	{ .compatible = "via,vt8500-timer" },
-	{ }
-};
-
-static void __init vt8500_timer_init(void)
+static void __init vt8500_timer_init(struct device_node *np)
 {
-	struct device_node *np;
 	int timer_irq;
 
-	np = of_find_matching_node(NULL, vt8500_timer_ids);
-	if (!np) {
-		pr_err("%s: Timer description missing from Device Tree\n",
-								__func__);
-		return;
-	}
 	regbase = of_iomap(np, 0);
 	if (!regbase) {
 		pr_err("%s: Missing iobase description in Device Tree\n",
@@ -177,4 +165,4 @@ static void __init vt8500_timer_init(void)
 					4, 0xf0000000);
 }
 
-CLOCKSOURCE_OF_DECLARE(vt8500, "via,vt8500-timer", vt8500_timer_init)
+CLOCKSOURCE_OF_DECLARE(vt8500, "via,vt8500-timer", vt8500_timer_init);