[3/7] arm: OMAP: Move dmtimer driver out of plat-omap to drivers under clocksource

Message ID 1509445726-21040-4-git-send-email-j-keerthy@ti.com
State Superseded
Headers show
Series
  • omap: dmtimer: Move driver out of plat-omap
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Commit Message

Keerthy Oct. 31, 2017, 10:28 a.m.
Move the dmtimer driver out of plat-omap to clocksource.
So that non-omap devices also could use this.

No Code changes done to the driver file.

Signed-off-by: Keerthy <j-keerthy@ti.com>
---
 arch/arm/plat-omap/Kconfig    |   6 -
 arch/arm/plat-omap/Makefile   |   1 -
 arch/arm/plat-omap/dmtimer.c  | 976 ------------------------------------------
 drivers/clocksource/Kconfig   |   6 +
 drivers/clocksource/Makefile  |   1 +
 drivers/clocksource/dmtimer.c | 976 ++++++++++++++++++++++++++++++++++++++++++
 6 files changed, 983 insertions(+), 983 deletions(-)
 delete mode 100644 arch/arm/plat-omap/dmtimer.c
 create mode 100644 drivers/clocksource/dmtimer.c

Patch

diff --git a/arch/arm/plat-omap/Kconfig b/arch/arm/plat-omap/Kconfig
index 3e27bff..4b92ac5 100644
--- a/arch/arm/plat-omap/Kconfig
+++ b/arch/arm/plat-omap/Kconfig
@@ -105,12 +105,6 @@  config OMAP3_L2_AUX_SECURE_SERVICE_SET_ID
 	help
 	  PPA routine service ID for setting L2 auxiliary control register.
 
-config OMAP_DM_TIMER
-	bool "Use dual-mode timer"
-	depends on ARCH_OMAP16XX || ARCH_OMAP2PLUS
-	help
-	 Select this option if you want to use OMAP Dual-Mode timers.
-
 config OMAP_SERIAL_WAKE
 	bool "Enable wake-up events for serial ports"
 	depends on ARCH_OMAP1 && OMAP_MUX
diff --git a/arch/arm/plat-omap/Makefile b/arch/arm/plat-omap/Makefile
index 47e1867..7215ada 100644
--- a/arch/arm/plat-omap/Makefile
+++ b/arch/arm/plat-omap/Makefile
@@ -9,5 +9,4 @@  obj-y := sram.o dma.o counter_32k.o
 
 # omap_device support (OMAP2+ only at the moment)
 
-obj-$(CONFIG_OMAP_DM_TIMER) += dmtimer.o
 obj-$(CONFIG_OMAP_DEBUG_LEDS) += debug-leds.o
diff --git a/arch/arm/plat-omap/dmtimer.c b/arch/arm/plat-omap/dmtimer.c
deleted file mode 100644
index afe1dc9..0000000
--- a/arch/arm/plat-omap/dmtimer.c
+++ /dev/null
@@ -1,976 +0,0 @@ 
-/*
- * linux/arch/arm/plat-omap/dmtimer.c
- *
- * OMAP Dual-Mode Timers
- *
- * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
- * Tarun Kanti DebBarma <tarun.kanti@ti.com>
- * Thara Gopinath <thara@ti.com>
- *
- * dmtimer adaptation to platform_driver.
- *
- * Copyright (C) 2005 Nokia Corporation
- * OMAP2 support by Juha Yrjola
- * API improvements and OMAP2 clock framework support by Timo Teras
- *
- * Copyright (C) 2009 Texas Instruments
- * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2 of the License, or (at your
- * option) any later version.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
- * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- * You should have received a copy of the  GNU General Public License along
- * with this program; if not, write  to the Free Software Foundation, Inc.,
- * 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
-#include <linux/clk.h>
-#include <linux/clk-provider.h>
-#include <linux/module.h>
-#include <linux/io.h>
-#include <linux/device.h>
-#include <linux/err.h>
-#include <linux/pm_runtime.h>
-#include <linux/of.h>
-#include <linux/of_device.h>
-#include <linux/platform_device.h>
-#include <linux/platform_data/dmtimer-omap.h>
-
-#include <clocksource/dmtimer.h>
-
-static u32 omap_reserved_systimers;
-static LIST_HEAD(omap_timer_list);
-static DEFINE_SPINLOCK(dm_timer_lock);
-
-enum {
-	REQUEST_ANY = 0,
-	REQUEST_BY_ID,
-	REQUEST_BY_CAP,
-	REQUEST_BY_NODE,
-};
-
-/**
- * omap_dm_timer_read_reg - read timer registers in posted and non-posted mode
- * @timer:      timer pointer over which read operation to perform
- * @reg:        lowest byte holds the register offset
- *
- * The posted mode bit is encoded in reg. Note that in posted mode write
- * pending bit must be checked. Otherwise a read of a non completed write
- * will produce an error.
- */
-static inline u32 omap_dm_timer_read_reg(struct omap_dm_timer *timer, u32 reg)
-{
-	WARN_ON((reg & 0xff) < _OMAP_TIMER_WAKEUP_EN_OFFSET);
-	return __omap_dm_timer_read(timer, reg, timer->posted);
-}
-
-/**
- * omap_dm_timer_write_reg - write timer registers in posted and non-posted mode
- * @timer:      timer pointer over which write operation is to perform
- * @reg:        lowest byte holds the register offset
- * @value:      data to write into the register
- *
- * The posted mode bit is encoded in reg. Note that in posted mode the write
- * pending bit must be checked. Otherwise a write on a register which has a
- * pending write will be lost.
- */
-static void omap_dm_timer_write_reg(struct omap_dm_timer *timer, u32 reg,
-						u32 value)
-{
-	WARN_ON((reg & 0xff) < _OMAP_TIMER_WAKEUP_EN_OFFSET);
-	__omap_dm_timer_write(timer, reg, value, timer->posted);
-}
-
-static void omap_timer_restore_context(struct omap_dm_timer *timer)
-{
-	omap_dm_timer_write_reg(timer, OMAP_TIMER_WAKEUP_EN_REG,
-				timer->context.twer);
-	omap_dm_timer_write_reg(timer, OMAP_TIMER_COUNTER_REG,
-				timer->context.tcrr);
-	omap_dm_timer_write_reg(timer, OMAP_TIMER_LOAD_REG,
-				timer->context.tldr);
-	omap_dm_timer_write_reg(timer, OMAP_TIMER_MATCH_REG,
-				timer->context.tmar);
-	omap_dm_timer_write_reg(timer, OMAP_TIMER_IF_CTRL_REG,
-				timer->context.tsicr);
-	writel_relaxed(timer->context.tier, timer->irq_ena);
-	omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG,
-				timer->context.tclr);
-}
-
-static int omap_dm_timer_reset(struct omap_dm_timer *timer)
-{
-	u32 l, timeout = 100000;
-
-	if (timer->revision != 1)
-		return -EINVAL;
-
-	omap_dm_timer_write_reg(timer, OMAP_TIMER_IF_CTRL_REG, 0x06);
-
-	do {
-		l = __omap_dm_timer_read(timer,
-					 OMAP_TIMER_V1_SYS_STAT_OFFSET, 0);
-	} while (!l && timeout--);
-
-	if (!timeout) {
-		dev_err(&timer->pdev->dev, "Timer failed to reset\n");
-		return -ETIMEDOUT;
-	}
-
-	/* Configure timer for smart-idle mode */
-	l = __omap_dm_timer_read(timer, OMAP_TIMER_OCP_CFG_OFFSET, 0);
-	l |= 0x2 << 0x3;
-	__omap_dm_timer_write(timer, OMAP_TIMER_OCP_CFG_OFFSET, l, 0);
-
-	timer->posted = 0;
-
-	return 0;
-}
-
-static int omap_dm_timer_of_set_source(struct omap_dm_timer *timer)
-{
-	int ret;
-	struct clk *parent;
-
-	/*
-	 * FIXME: OMAP1 devices do not use the clock framework for dmtimers so
-	 * do not call clk_get() for these devices.
-	 */
-	if (!timer->fclk)
-		return -ENODEV;
-
-	parent = clk_get(&timer->pdev->dev, NULL);
-	if (IS_ERR(parent))
-		return -ENODEV;
-
-	ret = clk_set_parent(timer->fclk, parent);
-	if (ret < 0)
-		pr_err("%s: failed to set parent\n", __func__);
-
-	clk_put(parent);
-
-	return ret;
-}
-
-static int omap_dm_timer_prepare(struct omap_dm_timer *timer)
-{
-	int rc;
-
-	/*
-	 * FIXME: OMAP1 devices do not use the clock framework for dmtimers so
-	 * do not call clk_get() for these devices.
-	 */
-	if (!(timer->capability & OMAP_TIMER_NEEDS_RESET)) {
-		timer->fclk = clk_get(&timer->pdev->dev, "fck");
-		if (WARN_ON_ONCE(IS_ERR(timer->fclk))) {
-			dev_err(&timer->pdev->dev, ": No fclk handle.\n");
-			return -EINVAL;
-		}
-	}
-
-	omap_dm_timer_enable(timer);
-
-	if (timer->capability & OMAP_TIMER_NEEDS_RESET) {
-		rc = omap_dm_timer_reset(timer);
-		if (rc) {
-			omap_dm_timer_disable(timer);
-			return rc;
-		}
-	}
-
-	__omap_dm_timer_enable_posted(timer);
-	omap_dm_timer_disable(timer);
-
-	rc = omap_dm_timer_of_set_source(timer);
-	if (rc == -ENODEV)
-		return omap_dm_timer_set_source(timer, OMAP_TIMER_SRC_32_KHZ);
-
-	return rc;
-}
-
-static inline u32 omap_dm_timer_reserved_systimer(int id)
-{
-	return (omap_reserved_systimers & (1 << (id - 1))) ? 1 : 0;
-}
-
-int omap_dm_timer_reserve_systimer(int id)
-{
-	if (omap_dm_timer_reserved_systimer(id))
-		return -ENODEV;
-
-	omap_reserved_systimers |= (1 << (id - 1));
-
-	return 0;
-}
-
-static struct omap_dm_timer *_omap_dm_timer_request(int req_type, void *data)
-{
-	struct omap_dm_timer *timer = NULL, *t;
-	struct device_node *np = NULL;
-	unsigned long flags;
-	u32 cap = 0;
-	int id = 0;
-
-	switch (req_type) {
-	case REQUEST_BY_ID:
-		id = *(int *)data;
-		break;
-	case REQUEST_BY_CAP:
-		cap = *(u32 *)data;
-		break;
-	case REQUEST_BY_NODE:
-		np = (struct device_node *)data;
-		break;
-	default:
-		/* REQUEST_ANY */
-		break;
-	}
-
-	spin_lock_irqsave(&dm_timer_lock, flags);
-	list_for_each_entry(t, &omap_timer_list, node) {
-		if (t->reserved)
-			continue;
-
-		switch (req_type) {
-		case REQUEST_BY_ID:
-			if (id == t->pdev->id) {
-				timer = t;
-				timer->reserved = 1;
-				goto found;
-			}
-			break;
-		case REQUEST_BY_CAP:
-			if (cap == (t->capability & cap)) {
-				/*
-				 * If timer is not NULL, we have already found
-				 * one timer. But it was not an exact match
-				 * because it had more capabilities than what
-				 * was required. Therefore, unreserve the last
-				 * timer found and see if this one is a better
-				 * match.
-				 */
-				if (timer)
-					timer->reserved = 0;
-				timer = t;
-				timer->reserved = 1;
-
-				/* Exit loop early if we find an exact match */
-				if (t->capability == cap)
-					goto found;
-			}
-			break;
-		case REQUEST_BY_NODE:
-			if (np == t->pdev->dev.of_node) {
-				timer = t;
-				timer->reserved = 1;
-				goto found;
-			}
-			break;
-		default:
-			/* REQUEST_ANY */
-			timer = t;
-			timer->reserved = 1;
-			goto found;
-		}
-	}
-found:
-	spin_unlock_irqrestore(&dm_timer_lock, flags);
-
-	if (timer && omap_dm_timer_prepare(timer)) {
-		timer->reserved = 0;
-		timer = NULL;
-	}
-
-	if (!timer)
-		pr_debug("%s: timer request failed!\n", __func__);
-
-	return timer;
-}
-
-struct omap_dm_timer *omap_dm_timer_request(void)
-{
-	return _omap_dm_timer_request(REQUEST_ANY, NULL);
-}
-
-struct omap_dm_timer *omap_dm_timer_request_specific(int id)
-{
-	/* Requesting timer by ID is not supported when device tree is used */
-	if (of_have_populated_dt()) {
-		pr_warn("%s: Please use omap_dm_timer_request_by_cap/node()\n",
-			__func__);
-		return NULL;
-	}
-
-	return _omap_dm_timer_request(REQUEST_BY_ID, &id);
-}
-
-/**
- * omap_dm_timer_request_by_cap - Request a timer by capability
- * @cap:	Bit mask of capabilities to match
- *
- * Find a timer based upon capabilities bit mask. Callers of this function
- * should use the definitions found in the plat/dmtimer.h file under the
- * comment "timer capabilities used in hwmod database". Returns pointer to
- * timer handle on success and a NULL pointer on failure.
- */
-struct omap_dm_timer *omap_dm_timer_request_by_cap(u32 cap)
-{
-	return _omap_dm_timer_request(REQUEST_BY_CAP, &cap);
-}
-
-/**
- * omap_dm_timer_request_by_node - Request a timer by device-tree node
- * @np:		Pointer to device-tree timer node
- *
- * Request a timer based upon a device node pointer. Returns pointer to
- * timer handle on success and a NULL pointer on failure.
- */
-struct omap_dm_timer *omap_dm_timer_request_by_node(struct device_node *np)
-{
-	if (!np)
-		return NULL;
-
-	return _omap_dm_timer_request(REQUEST_BY_NODE, np);
-}
-
-int omap_dm_timer_free(struct omap_dm_timer *timer)
-{
-	if (unlikely(!timer))
-		return -EINVAL;
-
-	clk_put(timer->fclk);
-
-	WARN_ON(!timer->reserved);
-	timer->reserved = 0;
-	return 0;
-}
-
-void omap_dm_timer_enable(struct omap_dm_timer *timer)
-{
-	int c;
-
-	pm_runtime_get_sync(&timer->pdev->dev);
-
-	if (!(timer->capability & OMAP_TIMER_ALWON)) {
-		if (timer->get_context_loss_count) {
-			c = timer->get_context_loss_count(&timer->pdev->dev);
-			if (c != timer->ctx_loss_count) {
-				omap_timer_restore_context(timer);
-				timer->ctx_loss_count = c;
-			}
-		} else {
-			omap_timer_restore_context(timer);
-		}
-	}
-}
-
-void omap_dm_timer_disable(struct omap_dm_timer *timer)
-{
-	pm_runtime_put_sync(&timer->pdev->dev);
-}
-
-int omap_dm_timer_get_irq(struct omap_dm_timer *timer)
-{
-	if (timer)
-		return timer->irq;
-	return -EINVAL;
-}
-
-#if defined(CONFIG_ARCH_OMAP1)
-#include <mach/hardware.h>
-/**
- * omap_dm_timer_modify_idlect_mask - Check if any running timers use ARMXOR
- * @inputmask: current value of idlect mask
- */
-__u32 omap_dm_timer_modify_idlect_mask(__u32 inputmask)
-{
-	int i = 0;
-	struct omap_dm_timer *timer = NULL;
-	unsigned long flags;
-
-	/* If ARMXOR cannot be idled this function call is unnecessary */
-	if (!(inputmask & (1 << 1)))
-		return inputmask;
-
-	/* If any active timer is using ARMXOR return modified mask */
-	spin_lock_irqsave(&dm_timer_lock, flags);
-	list_for_each_entry(timer, &omap_timer_list, node) {
-		u32 l;
-
-		l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
-		if (l & OMAP_TIMER_CTRL_ST) {
-			if (((omap_readl(MOD_CONF_CTRL_1) >> (i * 2)) & 0x03) == 0)
-				inputmask &= ~(1 << 1);
-			else
-				inputmask &= ~(1 << 2);
-		}
-		i++;
-	}
-	spin_unlock_irqrestore(&dm_timer_lock, flags);
-
-	return inputmask;
-}
-
-#else
-
-struct clk *omap_dm_timer_get_fclk(struct omap_dm_timer *timer)
-{
-	if (timer && !IS_ERR(timer->fclk))
-		return timer->fclk;
-	return NULL;
-}
-
-__u32 omap_dm_timer_modify_idlect_mask(__u32 inputmask)
-{
-	BUG();
-
-	return 0;
-}
-
-#endif
-
-int omap_dm_timer_trigger(struct omap_dm_timer *timer)
-{
-	if (unlikely(!timer || pm_runtime_suspended(&timer->pdev->dev))) {
-		pr_err("%s: timer not available or enabled.\n", __func__);
-		return -EINVAL;
-	}
-
-	omap_dm_timer_write_reg(timer, OMAP_TIMER_TRIGGER_REG, 0);
-	return 0;
-}
-
-int omap_dm_timer_start(struct omap_dm_timer *timer)
-{
-	u32 l;
-
-	if (unlikely(!timer))
-		return -EINVAL;
-
-	omap_dm_timer_enable(timer);
-
-	l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
-	if (!(l & OMAP_TIMER_CTRL_ST)) {
-		l |= OMAP_TIMER_CTRL_ST;
-		omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
-	}
-
-	/* Save the context */
-	timer->context.tclr = l;
-	return 0;
-}
-
-int omap_dm_timer_stop(struct omap_dm_timer *timer)
-{
-	unsigned long rate = 0;
-
-	if (unlikely(!timer))
-		return -EINVAL;
-
-	if (!(timer->capability & OMAP_TIMER_NEEDS_RESET))
-		rate = clk_get_rate(timer->fclk);
-
-	__omap_dm_timer_stop(timer, timer->posted, rate);
-
-	/*
-	 * Since the register values are computed and written within
-	 * __omap_dm_timer_stop, we need to use read to retrieve the
-	 * context.
-	 */
-	timer->context.tclr =
-			omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
-	omap_dm_timer_disable(timer);
-	return 0;
-}
-
-int omap_dm_timer_set_source(struct omap_dm_timer *timer, int source)
-{
-	int ret;
-	char *parent_name = NULL;
-	struct clk *parent;
-	struct dmtimer_platform_data *pdata;
-
-	if (unlikely(!timer))
-		return -EINVAL;
-
-	pdata = timer->pdev->dev.platform_data;
-
-	if (source < 0 || source >= 3)
-		return -EINVAL;
-
-	/*
-	 * FIXME: Used for OMAP1 devices only because they do not currently
-	 * use the clock framework to set the parent clock. To be removed
-	 * once OMAP1 migrated to using clock framework for dmtimers
-	 */
-	if (pdata && pdata->set_timer_src)
-		return pdata->set_timer_src(timer->pdev, source);
-
-	if (IS_ERR(timer->fclk))
-		return -EINVAL;
-
-#if defined(CONFIG_COMMON_CLK)
-	/* Check if the clock has configurable parents */
-	if (clk_hw_get_num_parents(__clk_get_hw(timer->fclk)) < 2)
-		return 0;
-#endif
-
-	switch (source) {
-	case OMAP_TIMER_SRC_SYS_CLK:
-		parent_name = "timer_sys_ck";
-		break;
-
-	case OMAP_TIMER_SRC_32_KHZ:
-		parent_name = "timer_32k_ck";
-		break;
-
-	case OMAP_TIMER_SRC_EXT_CLK:
-		parent_name = "timer_ext_ck";
-		break;
-	}
-
-	parent = clk_get(&timer->pdev->dev, parent_name);
-	if (IS_ERR(parent)) {
-		pr_err("%s: %s not found\n", __func__, parent_name);
-		return -EINVAL;
-	}
-
-	ret = clk_set_parent(timer->fclk, parent);
-	if (ret < 0)
-		pr_err("%s: failed to set %s as parent\n", __func__,
-			parent_name);
-
-	clk_put(parent);
-
-	return ret;
-}
-
-int omap_dm_timer_set_load(struct omap_dm_timer *timer, int autoreload,
-			    unsigned int load)
-{
-	u32 l;
-
-	if (unlikely(!timer))
-		return -EINVAL;
-
-	omap_dm_timer_enable(timer);
-	l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
-	if (autoreload)
-		l |= OMAP_TIMER_CTRL_AR;
-	else
-		l &= ~OMAP_TIMER_CTRL_AR;
-	omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
-	omap_dm_timer_write_reg(timer, OMAP_TIMER_LOAD_REG, load);
-
-	omap_dm_timer_write_reg(timer, OMAP_TIMER_TRIGGER_REG, 0);
-	/* Save the context */
-	timer->context.tclr = l;
-	timer->context.tldr = load;
-	omap_dm_timer_disable(timer);
-	return 0;
-}
-
-/* Optimized set_load which removes costly spin wait in timer_start */
-int omap_dm_timer_set_load_start(struct omap_dm_timer *timer, int autoreload,
-                            unsigned int load)
-{
-	u32 l;
-
-	if (unlikely(!timer))
-		return -EINVAL;
-
-	omap_dm_timer_enable(timer);
-
-	l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
-	if (autoreload) {
-		l |= OMAP_TIMER_CTRL_AR;
-		omap_dm_timer_write_reg(timer, OMAP_TIMER_LOAD_REG, load);
-	} else {
-		l &= ~OMAP_TIMER_CTRL_AR;
-	}
-	l |= OMAP_TIMER_CTRL_ST;
-
-	__omap_dm_timer_load_start(timer, l, load, timer->posted);
-
-	/* Save the context */
-	timer->context.tclr = l;
-	timer->context.tldr = load;
-	timer->context.tcrr = load;
-	return 0;
-}
-
-int omap_dm_timer_set_match(struct omap_dm_timer *timer, int enable,
-			     unsigned int match)
-{
-	u32 l;
-
-	if (unlikely(!timer))
-		return -EINVAL;
-
-	omap_dm_timer_enable(timer);
-	l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
-	if (enable)
-		l |= OMAP_TIMER_CTRL_CE;
-	else
-		l &= ~OMAP_TIMER_CTRL_CE;
-	omap_dm_timer_write_reg(timer, OMAP_TIMER_MATCH_REG, match);
-	omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
-
-	/* Save the context */
-	timer->context.tclr = l;
-	timer->context.tmar = match;
-	omap_dm_timer_disable(timer);
-	return 0;
-}
-
-int omap_dm_timer_set_pwm(struct omap_dm_timer *timer, int def_on,
-			   int toggle, int trigger)
-{
-	u32 l;
-
-	if (unlikely(!timer))
-		return -EINVAL;
-
-	omap_dm_timer_enable(timer);
-	l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
-	l &= ~(OMAP_TIMER_CTRL_GPOCFG | OMAP_TIMER_CTRL_SCPWM |
-	       OMAP_TIMER_CTRL_PT | (0x03 << 10));
-	if (def_on)
-		l |= OMAP_TIMER_CTRL_SCPWM;
-	if (toggle)
-		l |= OMAP_TIMER_CTRL_PT;
-	l |= trigger << 10;
-	omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
-
-	/* Save the context */
-	timer->context.tclr = l;
-	omap_dm_timer_disable(timer);
-	return 0;
-}
-
-int omap_dm_timer_set_prescaler(struct omap_dm_timer *timer, int prescaler)
-{
-	u32 l;
-
-	if (unlikely(!timer))
-		return -EINVAL;
-
-	omap_dm_timer_enable(timer);
-	l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
-	l &= ~(OMAP_TIMER_CTRL_PRE | (0x07 << 2));
-	if (prescaler >= 0x00 && prescaler <= 0x07) {
-		l |= OMAP_TIMER_CTRL_PRE;
-		l |= prescaler << 2;
-	}
-	omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
-
-	/* Save the context */
-	timer->context.tclr = l;
-	omap_dm_timer_disable(timer);
-	return 0;
-}
-
-int omap_dm_timer_set_int_enable(struct omap_dm_timer *timer,
-				  unsigned int value)
-{
-	if (unlikely(!timer))
-		return -EINVAL;
-
-	omap_dm_timer_enable(timer);
-	__omap_dm_timer_int_enable(timer, value);
-
-	/* Save the context */
-	timer->context.tier = value;
-	timer->context.twer = value;
-	omap_dm_timer_disable(timer);
-	return 0;
-}
-
-/**
- * omap_dm_timer_set_int_disable - disable timer interrupts
- * @timer:	pointer to timer handle
- * @mask:	bit mask of interrupts to be disabled
- *
- * Disables the specified timer interrupts for a timer.
- */
-int omap_dm_timer_set_int_disable(struct omap_dm_timer *timer, u32 mask)
-{
-	u32 l = mask;
-
-	if (unlikely(!timer))
-		return -EINVAL;
-
-	omap_dm_timer_enable(timer);
-
-	if (timer->revision == 1)
-		l = readl_relaxed(timer->irq_ena) & ~mask;
-
-	writel_relaxed(l, timer->irq_dis);
-	l = omap_dm_timer_read_reg(timer, OMAP_TIMER_WAKEUP_EN_REG) & ~mask;
-	omap_dm_timer_write_reg(timer, OMAP_TIMER_WAKEUP_EN_REG, l);
-
-	/* Save the context */
-	timer->context.tier &= ~mask;
-	timer->context.twer &= ~mask;
-	omap_dm_timer_disable(timer);
-	return 0;
-}
-
-unsigned int omap_dm_timer_read_status(struct omap_dm_timer *timer)
-{
-	unsigned int l;
-
-	if (unlikely(!timer || pm_runtime_suspended(&timer->pdev->dev))) {
-		pr_err("%s: timer not available or enabled.\n", __func__);
-		return 0;
-	}
-
-	l = readl_relaxed(timer->irq_stat);
-
-	return l;
-}
-
-int omap_dm_timer_write_status(struct omap_dm_timer *timer, unsigned int value)
-{
-	if (unlikely(!timer || pm_runtime_suspended(&timer->pdev->dev)))
-		return -EINVAL;
-
-	__omap_dm_timer_write_status(timer, value);
-
-	return 0;
-}
-
-unsigned int omap_dm_timer_read_counter(struct omap_dm_timer *timer)
-{
-	if (unlikely(!timer || pm_runtime_suspended(&timer->pdev->dev))) {
-		pr_err("%s: timer not iavailable or enabled.\n", __func__);
-		return 0;
-	}
-
-	return __omap_dm_timer_read_counter(timer, timer->posted);
-}
-
-int omap_dm_timer_write_counter(struct omap_dm_timer *timer, unsigned int value)
-{
-	if (unlikely(!timer || pm_runtime_suspended(&timer->pdev->dev))) {
-		pr_err("%s: timer not available or enabled.\n", __func__);
-		return -EINVAL;
-	}
-
-	omap_dm_timer_write_reg(timer, OMAP_TIMER_COUNTER_REG, value);
-
-	/* Save the context */
-	timer->context.tcrr = value;
-	return 0;
-}
-
-int omap_dm_timers_active(void)
-{
-	struct omap_dm_timer *timer;
-
-	list_for_each_entry(timer, &omap_timer_list, node) {
-		if (!timer->reserved)
-			continue;
-
-		if (omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG) &
-		    OMAP_TIMER_CTRL_ST) {
-			return 1;
-		}
-	}
-	return 0;
-}
-
-static const struct of_device_id omap_timer_match[];
-
-/**
- * omap_dm_timer_probe - probe function called for every registered device
- * @pdev:	pointer to current timer platform device
- *
- * Called by driver framework at the end of device registration for all
- * timer devices.
- */
-static int omap_dm_timer_probe(struct platform_device *pdev)
-{
-	unsigned long flags;
-	struct omap_dm_timer *timer;
-	struct resource *mem, *irq;
-	struct device *dev = &pdev->dev;
-	const struct of_device_id *match;
-	const struct dmtimer_platform_data *pdata;
-	int ret;
-
-	match = of_match_device(of_match_ptr(omap_timer_match), dev);
-	pdata = match ? match->data : dev->platform_data;
-
-	if (!pdata && !dev->of_node) {
-		dev_err(dev, "%s: no platform data.\n", __func__);
-		return -ENODEV;
-	}
-
-	irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
-	if (unlikely(!irq)) {
-		dev_err(dev, "%s: no IRQ resource.\n", __func__);
-		return -ENODEV;
-	}
-
-	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (unlikely(!mem)) {
-		dev_err(dev, "%s: no memory resource.\n", __func__);
-		return -ENODEV;
-	}
-
-	timer = devm_kzalloc(dev, sizeof(*timer), GFP_KERNEL);
-	if (!timer)
-		return  -ENOMEM;
-
-	timer->fclk = ERR_PTR(-ENODEV);
-	timer->io_base = devm_ioremap_resource(dev, mem);
-	if (IS_ERR(timer->io_base))
-		return PTR_ERR(timer->io_base);
-
-	if (dev->of_node) {
-		if (of_find_property(dev->of_node, "ti,timer-alwon", NULL))
-			timer->capability |= OMAP_TIMER_ALWON;
-		if (of_find_property(dev->of_node, "ti,timer-dsp", NULL))
-			timer->capability |= OMAP_TIMER_HAS_DSP_IRQ;
-		if (of_find_property(dev->of_node, "ti,timer-pwm", NULL))
-			timer->capability |= OMAP_TIMER_HAS_PWM;
-		if (of_find_property(dev->of_node, "ti,timer-secure", NULL))
-			timer->capability |= OMAP_TIMER_SECURE;
-	} else {
-		timer->id = pdev->id;
-		timer->capability = pdata->timer_capability;
-		timer->reserved = omap_dm_timer_reserved_systimer(timer->id);
-		timer->get_context_loss_count = pdata->get_context_loss_count;
-	}
-
-	if (pdata)
-		timer->errata = pdata->timer_errata;
-
-	timer->irq = irq->start;
-	timer->pdev = pdev;
-
-	/* Skip pm_runtime_enable for OMAP1 */
-	if (!(timer->capability & OMAP_TIMER_NEEDS_RESET)) {
-		pm_runtime_enable(dev);
-		pm_runtime_irq_safe(dev);
-	}
-
-	if (!timer->reserved) {
-		ret = pm_runtime_get_sync(dev);
-		if (ret < 0) {
-			dev_err(dev, "%s: pm_runtime_get_sync failed!\n",
-				__func__);
-			goto err_get_sync;
-		}
-		__omap_dm_timer_init_regs(timer);
-		pm_runtime_put(dev);
-	}
-
-	/* add the timer element to the list */
-	spin_lock_irqsave(&dm_timer_lock, flags);
-	list_add_tail(&timer->node, &omap_timer_list);
-	spin_unlock_irqrestore(&dm_timer_lock, flags);
-
-	dev_dbg(dev, "Device Probed.\n");
-
-	return 0;
-
-err_get_sync:
-	pm_runtime_put_noidle(dev);
-	pm_runtime_disable(dev);
-	return ret;
-}
-
-/**
- * omap_dm_timer_remove - cleanup a registered timer device
- * @pdev:	pointer to current timer platform device
- *
- * Called by driver framework whenever a timer device is unregistered.
- * In addition to freeing platform resources it also deletes the timer
- * entry from the local list.
- */
-static int omap_dm_timer_remove(struct platform_device *pdev)
-{
-	struct omap_dm_timer *timer;
-	unsigned long flags;
-	int ret = -EINVAL;
-
-	spin_lock_irqsave(&dm_timer_lock, flags);
-	list_for_each_entry(timer, &omap_timer_list, node)
-		if (!strcmp(dev_name(&timer->pdev->dev),
-			    dev_name(&pdev->dev))) {
-			list_del(&timer->node);
-			ret = 0;
-			break;
-		}
-	spin_unlock_irqrestore(&dm_timer_lock, flags);
-
-	pm_runtime_disable(&pdev->dev);
-
-	return ret;
-}
-
-static const struct dmtimer_platform_data omap3plus_pdata = {
-	.timer_errata = OMAP_TIMER_ERRATA_I103_I767,
-};
-
-static const struct of_device_id omap_timer_match[] = {
-	{
-		.compatible = "ti,omap2420-timer",
-	},
-	{
-		.compatible = "ti,omap3430-timer",
-		.data = &omap3plus_pdata,
-	},
-	{
-		.compatible = "ti,omap4430-timer",
-		.data = &omap3plus_pdata,
-	},
-	{
-		.compatible = "ti,omap5430-timer",
-		.data = &omap3plus_pdata,
-	},
-	{
-		.compatible = "ti,am335x-timer",
-		.data = &omap3plus_pdata,
-	},
-	{
-		.compatible = "ti,am335x-timer-1ms",
-		.data = &omap3plus_pdata,
-	},
-	{
-		.compatible = "ti,dm816-timer",
-		.data = &omap3plus_pdata,
-	},
-	{},
-};
-MODULE_DEVICE_TABLE(of, omap_timer_match);
-
-static struct platform_driver omap_dm_timer_driver = {
-	.probe  = omap_dm_timer_probe,
-	.remove = omap_dm_timer_remove,
-	.driver = {
-		.name   = "omap_timer",
-		.of_match_table = of_match_ptr(omap_timer_match),
-	},
-};
-
-early_platform_init("earlytimer", &omap_dm_timer_driver);
-module_platform_driver(omap_dm_timer_driver);
-
-MODULE_DESCRIPTION("OMAP Dual-Mode Timer Driver");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:" DRIVER_NAME);
-MODULE_AUTHOR("Texas Instruments Inc");
diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index c729a88..4da66cf 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -46,6 +46,12 @@  config DIGICOLOR_TIMER
 	help
 	  Enables the support for the digicolor timer driver.
 
+config OMAP_DM_TIMER
+	bool "Use dual-mode timer"
+	depends on ARCH_OMAP16XX || ARCH_OMAP2PLUS
+	help
+	 Select this option if you want to use Dual-Mode timers.
+
 config DW_APB_TIMER
 	bool "DW APB timer driver" if COMPILE_TEST
 	help
diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
index dbc1ad1..a8e51e6 100644
--- a/drivers/clocksource/Makefile
+++ b/drivers/clocksource/Makefile
@@ -15,6 +15,7 @@  obj-$(CONFIG_EM_TIMER_STI)	+= em_sti.o
 obj-$(CONFIG_CLKBLD_I8253)	+= i8253.o
 obj-$(CONFIG_CLKSRC_MMIO)	+= mmio.o
 obj-$(CONFIG_DIGICOLOR_TIMER)	+= timer-digicolor.o
+obj-$(CONFIG_OMAP_DM_TIMER)	+= dmtimer.o
 obj-$(CONFIG_DW_APB_TIMER)	+= dw_apb_timer.o
 obj-$(CONFIG_DW_APB_TIMER_OF)	+= dw_apb_timer_of.o
 obj-$(CONFIG_FTTMR010_TIMER)	+= timer-fttmr010.o
diff --git a/drivers/clocksource/dmtimer.c b/drivers/clocksource/dmtimer.c
new file mode 100644
index 0000000..afe1dc9
--- /dev/null
+++ b/drivers/clocksource/dmtimer.c
@@ -0,0 +1,976 @@ 
+/*
+ * linux/arch/arm/plat-omap/dmtimer.c
+ *
+ * OMAP Dual-Mode Timers
+ *
+ * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
+ * Tarun Kanti DebBarma <tarun.kanti@ti.com>
+ * Thara Gopinath <thara@ti.com>
+ *
+ * dmtimer adaptation to platform_driver.
+ *
+ * Copyright (C) 2005 Nokia Corporation
+ * OMAP2 support by Juha Yrjola
+ * API improvements and OMAP2 clock framework support by Timo Teras
+ *
+ * Copyright (C) 2009 Texas Instruments
+ * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
+ * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * You should have received a copy of the  GNU General Public License along
+ * with this program; if not, write  to the Free Software Foundation, Inc.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/pm_runtime.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/platform_data/dmtimer-omap.h>
+
+#include <clocksource/dmtimer.h>
+
+static u32 omap_reserved_systimers;
+static LIST_HEAD(omap_timer_list);
+static DEFINE_SPINLOCK(dm_timer_lock);
+
+enum {
+	REQUEST_ANY = 0,
+	REQUEST_BY_ID,
+	REQUEST_BY_CAP,
+	REQUEST_BY_NODE,
+};
+
+/**
+ * omap_dm_timer_read_reg - read timer registers in posted and non-posted mode
+ * @timer:      timer pointer over which read operation to perform
+ * @reg:        lowest byte holds the register offset
+ *
+ * The posted mode bit is encoded in reg. Note that in posted mode write
+ * pending bit must be checked. Otherwise a read of a non completed write
+ * will produce an error.
+ */
+static inline u32 omap_dm_timer_read_reg(struct omap_dm_timer *timer, u32 reg)
+{
+	WARN_ON((reg & 0xff) < _OMAP_TIMER_WAKEUP_EN_OFFSET);
+	return __omap_dm_timer_read(timer, reg, timer->posted);
+}
+
+/**
+ * omap_dm_timer_write_reg - write timer registers in posted and non-posted mode
+ * @timer:      timer pointer over which write operation is to perform
+ * @reg:        lowest byte holds the register offset
+ * @value:      data to write into the register
+ *
+ * The posted mode bit is encoded in reg. Note that in posted mode the write
+ * pending bit must be checked. Otherwise a write on a register which has a
+ * pending write will be lost.
+ */
+static void omap_dm_timer_write_reg(struct omap_dm_timer *timer, u32 reg,
+						u32 value)
+{
+	WARN_ON((reg & 0xff) < _OMAP_TIMER_WAKEUP_EN_OFFSET);
+	__omap_dm_timer_write(timer, reg, value, timer->posted);
+}
+
+static void omap_timer_restore_context(struct omap_dm_timer *timer)
+{
+	omap_dm_timer_write_reg(timer, OMAP_TIMER_WAKEUP_EN_REG,
+				timer->context.twer);
+	omap_dm_timer_write_reg(timer, OMAP_TIMER_COUNTER_REG,
+				timer->context.tcrr);
+	omap_dm_timer_write_reg(timer, OMAP_TIMER_LOAD_REG,
+				timer->context.tldr);
+	omap_dm_timer_write_reg(timer, OMAP_TIMER_MATCH_REG,
+				timer->context.tmar);
+	omap_dm_timer_write_reg(timer, OMAP_TIMER_IF_CTRL_REG,
+				timer->context.tsicr);
+	writel_relaxed(timer->context.tier, timer->irq_ena);
+	omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG,
+				timer->context.tclr);
+}
+
+static int omap_dm_timer_reset(struct omap_dm_timer *timer)
+{
+	u32 l, timeout = 100000;
+
+	if (timer->revision != 1)
+		return -EINVAL;
+
+	omap_dm_timer_write_reg(timer, OMAP_TIMER_IF_CTRL_REG, 0x06);
+
+	do {
+		l = __omap_dm_timer_read(timer,
+					 OMAP_TIMER_V1_SYS_STAT_OFFSET, 0);
+	} while (!l && timeout--);
+
+	if (!timeout) {
+		dev_err(&timer->pdev->dev, "Timer failed to reset\n");
+		return -ETIMEDOUT;
+	}
+
+	/* Configure timer for smart-idle mode */
+	l = __omap_dm_timer_read(timer, OMAP_TIMER_OCP_CFG_OFFSET, 0);
+	l |= 0x2 << 0x3;
+	__omap_dm_timer_write(timer, OMAP_TIMER_OCP_CFG_OFFSET, l, 0);
+
+	timer->posted = 0;
+
+	return 0;
+}
+
+static int omap_dm_timer_of_set_source(struct omap_dm_timer *timer)
+{
+	int ret;
+	struct clk *parent;
+
+	/*
+	 * FIXME: OMAP1 devices do not use the clock framework for dmtimers so
+	 * do not call clk_get() for these devices.
+	 */
+	if (!timer->fclk)
+		return -ENODEV;
+
+	parent = clk_get(&timer->pdev->dev, NULL);
+	if (IS_ERR(parent))
+		return -ENODEV;
+
+	ret = clk_set_parent(timer->fclk, parent);
+	if (ret < 0)
+		pr_err("%s: failed to set parent\n", __func__);
+
+	clk_put(parent);
+
+	return ret;
+}
+
+static int omap_dm_timer_prepare(struct omap_dm_timer *timer)
+{
+	int rc;
+
+	/*
+	 * FIXME: OMAP1 devices do not use the clock framework for dmtimers so
+	 * do not call clk_get() for these devices.
+	 */
+	if (!(timer->capability & OMAP_TIMER_NEEDS_RESET)) {
+		timer->fclk = clk_get(&timer->pdev->dev, "fck");
+		if (WARN_ON_ONCE(IS_ERR(timer->fclk))) {
+			dev_err(&timer->pdev->dev, ": No fclk handle.\n");
+			return -EINVAL;
+		}
+	}
+
+	omap_dm_timer_enable(timer);
+
+	if (timer->capability & OMAP_TIMER_NEEDS_RESET) {
+		rc = omap_dm_timer_reset(timer);
+		if (rc) {
+			omap_dm_timer_disable(timer);
+			return rc;
+		}
+	}
+
+	__omap_dm_timer_enable_posted(timer);
+	omap_dm_timer_disable(timer);
+
+	rc = omap_dm_timer_of_set_source(timer);
+	if (rc == -ENODEV)
+		return omap_dm_timer_set_source(timer, OMAP_TIMER_SRC_32_KHZ);
+
+	return rc;
+}
+
+static inline u32 omap_dm_timer_reserved_systimer(int id)
+{
+	return (omap_reserved_systimers & (1 << (id - 1))) ? 1 : 0;
+}
+
+int omap_dm_timer_reserve_systimer(int id)
+{
+	if (omap_dm_timer_reserved_systimer(id))
+		return -ENODEV;
+
+	omap_reserved_systimers |= (1 << (id - 1));
+
+	return 0;
+}
+
+static struct omap_dm_timer *_omap_dm_timer_request(int req_type, void *data)
+{
+	struct omap_dm_timer *timer = NULL, *t;
+	struct device_node *np = NULL;
+	unsigned long flags;
+	u32 cap = 0;
+	int id = 0;
+
+	switch (req_type) {
+	case REQUEST_BY_ID:
+		id = *(int *)data;
+		break;
+	case REQUEST_BY_CAP:
+		cap = *(u32 *)data;
+		break;
+	case REQUEST_BY_NODE:
+		np = (struct device_node *)data;
+		break;
+	default:
+		/* REQUEST_ANY */
+		break;
+	}
+
+	spin_lock_irqsave(&dm_timer_lock, flags);
+	list_for_each_entry(t, &omap_timer_list, node) {
+		if (t->reserved)
+			continue;
+
+		switch (req_type) {
+		case REQUEST_BY_ID:
+			if (id == t->pdev->id) {
+				timer = t;
+				timer->reserved = 1;
+				goto found;
+			}
+			break;
+		case REQUEST_BY_CAP:
+			if (cap == (t->capability & cap)) {
+				/*
+				 * If timer is not NULL, we have already found
+				 * one timer. But it was not an exact match
+				 * because it had more capabilities than what
+				 * was required. Therefore, unreserve the last
+				 * timer found and see if this one is a better
+				 * match.
+				 */
+				if (timer)
+					timer->reserved = 0;
+				timer = t;
+				timer->reserved = 1;
+
+				/* Exit loop early if we find an exact match */
+				if (t->capability == cap)
+					goto found;
+			}
+			break;
+		case REQUEST_BY_NODE:
+			if (np == t->pdev->dev.of_node) {
+				timer = t;
+				timer->reserved = 1;
+				goto found;
+			}
+			break;
+		default:
+			/* REQUEST_ANY */
+			timer = t;
+			timer->reserved = 1;
+			goto found;
+		}
+	}
+found:
+	spin_unlock_irqrestore(&dm_timer_lock, flags);
+
+	if (timer && omap_dm_timer_prepare(timer)) {
+		timer->reserved = 0;
+		timer = NULL;
+	}
+
+	if (!timer)
+		pr_debug("%s: timer request failed!\n", __func__);
+
+	return timer;
+}
+
+struct omap_dm_timer *omap_dm_timer_request(void)
+{
+	return _omap_dm_timer_request(REQUEST_ANY, NULL);
+}
+
+struct omap_dm_timer *omap_dm_timer_request_specific(int id)
+{
+	/* Requesting timer by ID is not supported when device tree is used */
+	if (of_have_populated_dt()) {
+		pr_warn("%s: Please use omap_dm_timer_request_by_cap/node()\n",
+			__func__);
+		return NULL;
+	}
+
+	return _omap_dm_timer_request(REQUEST_BY_ID, &id);
+}
+
+/**
+ * omap_dm_timer_request_by_cap - Request a timer by capability
+ * @cap:	Bit mask of capabilities to match
+ *
+ * Find a timer based upon capabilities bit mask. Callers of this function
+ * should use the definitions found in the plat/dmtimer.h file under the
+ * comment "timer capabilities used in hwmod database". Returns pointer to
+ * timer handle on success and a NULL pointer on failure.
+ */
+struct omap_dm_timer *omap_dm_timer_request_by_cap(u32 cap)
+{
+	return _omap_dm_timer_request(REQUEST_BY_CAP, &cap);
+}
+
+/**
+ * omap_dm_timer_request_by_node - Request a timer by device-tree node
+ * @np:		Pointer to device-tree timer node
+ *
+ * Request a timer based upon a device node pointer. Returns pointer to
+ * timer handle on success and a NULL pointer on failure.
+ */
+struct omap_dm_timer *omap_dm_timer_request_by_node(struct device_node *np)
+{
+	if (!np)
+		return NULL;
+
+	return _omap_dm_timer_request(REQUEST_BY_NODE, np);
+}
+
+int omap_dm_timer_free(struct omap_dm_timer *timer)
+{
+	if (unlikely(!timer))
+		return -EINVAL;
+
+	clk_put(timer->fclk);
+
+	WARN_ON(!timer->reserved);
+	timer->reserved = 0;
+	return 0;
+}
+
+void omap_dm_timer_enable(struct omap_dm_timer *timer)
+{
+	int c;
+
+	pm_runtime_get_sync(&timer->pdev->dev);
+
+	if (!(timer->capability & OMAP_TIMER_ALWON)) {
+		if (timer->get_context_loss_count) {
+			c = timer->get_context_loss_count(&timer->pdev->dev);
+			if (c != timer->ctx_loss_count) {
+				omap_timer_restore_context(timer);
+				timer->ctx_loss_count = c;
+			}
+		} else {
+			omap_timer_restore_context(timer);
+		}
+	}
+}
+
+void omap_dm_timer_disable(struct omap_dm_timer *timer)
+{
+	pm_runtime_put_sync(&timer->pdev->dev);
+}
+
+int omap_dm_timer_get_irq(struct omap_dm_timer *timer)
+{
+	if (timer)
+		return timer->irq;
+	return -EINVAL;
+}
+
+#if defined(CONFIG_ARCH_OMAP1)
+#include <mach/hardware.h>
+/**
+ * omap_dm_timer_modify_idlect_mask - Check if any running timers use ARMXOR
+ * @inputmask: current value of idlect mask
+ */
+__u32 omap_dm_timer_modify_idlect_mask(__u32 inputmask)
+{
+	int i = 0;
+	struct omap_dm_timer *timer = NULL;
+	unsigned long flags;
+
+	/* If ARMXOR cannot be idled this function call is unnecessary */
+	if (!(inputmask & (1 << 1)))
+		return inputmask;
+
+	/* If any active timer is using ARMXOR return modified mask */
+	spin_lock_irqsave(&dm_timer_lock, flags);
+	list_for_each_entry(timer, &omap_timer_list, node) {
+		u32 l;
+
+		l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
+		if (l & OMAP_TIMER_CTRL_ST) {
+			if (((omap_readl(MOD_CONF_CTRL_1) >> (i * 2)) & 0x03) == 0)
+				inputmask &= ~(1 << 1);
+			else
+				inputmask &= ~(1 << 2);
+		}
+		i++;
+	}
+	spin_unlock_irqrestore(&dm_timer_lock, flags);
+
+	return inputmask;
+}
+
+#else
+
+struct clk *omap_dm_timer_get_fclk(struct omap_dm_timer *timer)
+{
+	if (timer && !IS_ERR(timer->fclk))
+		return timer->fclk;
+	return NULL;
+}
+
+__u32 omap_dm_timer_modify_idlect_mask(__u32 inputmask)
+{
+	BUG();
+
+	return 0;
+}
+
+#endif
+
+int omap_dm_timer_trigger(struct omap_dm_timer *timer)
+{
+	if (unlikely(!timer || pm_runtime_suspended(&timer->pdev->dev))) {
+		pr_err("%s: timer not available or enabled.\n", __func__);
+		return -EINVAL;
+	}
+
+	omap_dm_timer_write_reg(timer, OMAP_TIMER_TRIGGER_REG, 0);
+	return 0;
+}
+
+int omap_dm_timer_start(struct omap_dm_timer *timer)
+{
+	u32 l;
+
+	if (unlikely(!timer))
+		return -EINVAL;
+
+	omap_dm_timer_enable(timer);
+
+	l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
+	if (!(l & OMAP_TIMER_CTRL_ST)) {
+		l |= OMAP_TIMER_CTRL_ST;
+		omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
+	}
+
+	/* Save the context */
+	timer->context.tclr = l;
+	return 0;
+}
+
+int omap_dm_timer_stop(struct omap_dm_timer *timer)
+{
+	unsigned long rate = 0;
+
+	if (unlikely(!timer))
+		return -EINVAL;
+
+	if (!(timer->capability & OMAP_TIMER_NEEDS_RESET))
+		rate = clk_get_rate(timer->fclk);
+
+	__omap_dm_timer_stop(timer, timer->posted, rate);
+
+	/*
+	 * Since the register values are computed and written within
+	 * __omap_dm_timer_stop, we need to use read to retrieve the
+	 * context.
+	 */
+	timer->context.tclr =
+			omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
+	omap_dm_timer_disable(timer);
+	return 0;
+}
+
+int omap_dm_timer_set_source(struct omap_dm_timer *timer, int source)
+{
+	int ret;
+	char *parent_name = NULL;
+	struct clk *parent;
+	struct dmtimer_platform_data *pdata;
+
+	if (unlikely(!timer))
+		return -EINVAL;
+
+	pdata = timer->pdev->dev.platform_data;
+
+	if (source < 0 || source >= 3)
+		return -EINVAL;
+
+	/*
+	 * FIXME: Used for OMAP1 devices only because they do not currently
+	 * use the clock framework to set the parent clock. To be removed
+	 * once OMAP1 migrated to using clock framework for dmtimers
+	 */
+	if (pdata && pdata->set_timer_src)
+		return pdata->set_timer_src(timer->pdev, source);
+
+	if (IS_ERR(timer->fclk))
+		return -EINVAL;
+
+#if defined(CONFIG_COMMON_CLK)
+	/* Check if the clock has configurable parents */
+	if (clk_hw_get_num_parents(__clk_get_hw(timer->fclk)) < 2)
+		return 0;
+#endif
+
+	switch (source) {
+	case OMAP_TIMER_SRC_SYS_CLK:
+		parent_name = "timer_sys_ck";
+		break;
+
+	case OMAP_TIMER_SRC_32_KHZ:
+		parent_name = "timer_32k_ck";
+		break;
+
+	case OMAP_TIMER_SRC_EXT_CLK:
+		parent_name = "timer_ext_ck";
+		break;
+	}
+
+	parent = clk_get(&timer->pdev->dev, parent_name);
+	if (IS_ERR(parent)) {
+		pr_err("%s: %s not found\n", __func__, parent_name);
+		return -EINVAL;
+	}
+
+	ret = clk_set_parent(timer->fclk, parent);
+	if (ret < 0)
+		pr_err("%s: failed to set %s as parent\n", __func__,
+			parent_name);
+
+	clk_put(parent);
+
+	return ret;
+}
+
+int omap_dm_timer_set_load(struct omap_dm_timer *timer, int autoreload,
+			    unsigned int load)
+{
+	u32 l;
+
+	if (unlikely(!timer))
+		return -EINVAL;
+
+	omap_dm_timer_enable(timer);
+	l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
+	if (autoreload)
+		l |= OMAP_TIMER_CTRL_AR;
+	else
+		l &= ~OMAP_TIMER_CTRL_AR;
+	omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
+	omap_dm_timer_write_reg(timer, OMAP_TIMER_LOAD_REG, load);
+
+	omap_dm_timer_write_reg(timer, OMAP_TIMER_TRIGGER_REG, 0);
+	/* Save the context */
+	timer->context.tclr = l;
+	timer->context.tldr = load;
+	omap_dm_timer_disable(timer);
+	return 0;
+}
+
+/* Optimized set_load which removes costly spin wait in timer_start */
+int omap_dm_timer_set_load_start(struct omap_dm_timer *timer, int autoreload,
+                            unsigned int load)
+{
+	u32 l;
+
+	if (unlikely(!timer))
+		return -EINVAL;
+
+	omap_dm_timer_enable(timer);
+
+	l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
+	if (autoreload) {
+		l |= OMAP_TIMER_CTRL_AR;
+		omap_dm_timer_write_reg(timer, OMAP_TIMER_LOAD_REG, load);
+	} else {
+		l &= ~OMAP_TIMER_CTRL_AR;
+	}
+	l |= OMAP_TIMER_CTRL_ST;
+
+	__omap_dm_timer_load_start(timer, l, load, timer->posted);
+
+	/* Save the context */
+	timer->context.tclr = l;
+	timer->context.tldr = load;
+	timer->context.tcrr = load;
+	return 0;
+}
+
+int omap_dm_timer_set_match(struct omap_dm_timer *timer, int enable,
+			     unsigned int match)
+{
+	u32 l;
+
+	if (unlikely(!timer))
+		return -EINVAL;
+
+	omap_dm_timer_enable(timer);
+	l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
+	if (enable)
+		l |= OMAP_TIMER_CTRL_CE;
+	else
+		l &= ~OMAP_TIMER_CTRL_CE;
+	omap_dm_timer_write_reg(timer, OMAP_TIMER_MATCH_REG, match);
+	omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
+
+	/* Save the context */
+	timer->context.tclr = l;
+	timer->context.tmar = match;
+	omap_dm_timer_disable(timer);
+	return 0;
+}
+
+int omap_dm_timer_set_pwm(struct omap_dm_timer *timer, int def_on,
+			   int toggle, int trigger)
+{
+	u32 l;
+
+	if (unlikely(!timer))
+		return -EINVAL;
+
+	omap_dm_timer_enable(timer);
+	l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
+	l &= ~(OMAP_TIMER_CTRL_GPOCFG | OMAP_TIMER_CTRL_SCPWM |
+	       OMAP_TIMER_CTRL_PT | (0x03 << 10));
+	if (def_on)
+		l |= OMAP_TIMER_CTRL_SCPWM;
+	if (toggle)
+		l |= OMAP_TIMER_CTRL_PT;
+	l |= trigger << 10;
+	omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
+
+	/* Save the context */
+	timer->context.tclr = l;
+	omap_dm_timer_disable(timer);
+	return 0;
+}
+
+int omap_dm_timer_set_prescaler(struct omap_dm_timer *timer, int prescaler)
+{
+	u32 l;
+
+	if (unlikely(!timer))
+		return -EINVAL;
+
+	omap_dm_timer_enable(timer);
+	l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
+	l &= ~(OMAP_TIMER_CTRL_PRE | (0x07 << 2));
+	if (prescaler >= 0x00 && prescaler <= 0x07) {
+		l |= OMAP_TIMER_CTRL_PRE;
+		l |= prescaler << 2;
+	}
+	omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
+
+	/* Save the context */
+	timer->context.tclr = l;
+	omap_dm_timer_disable(timer);
+	return 0;
+}
+
+int omap_dm_timer_set_int_enable(struct omap_dm_timer *timer,
+				  unsigned int value)
+{
+	if (unlikely(!timer))
+		return -EINVAL;
+
+	omap_dm_timer_enable(timer);
+	__omap_dm_timer_int_enable(timer, value);
+
+	/* Save the context */
+	timer->context.tier = value;
+	timer->context.twer = value;
+	omap_dm_timer_disable(timer);
+	return 0;
+}
+
+/**
+ * omap_dm_timer_set_int_disable - disable timer interrupts
+ * @timer:	pointer to timer handle
+ * @mask:	bit mask of interrupts to be disabled
+ *
+ * Disables the specified timer interrupts for a timer.
+ */
+int omap_dm_timer_set_int_disable(struct omap_dm_timer *timer, u32 mask)
+{
+	u32 l = mask;
+
+	if (unlikely(!timer))
+		return -EINVAL;
+
+	omap_dm_timer_enable(timer);
+
+	if (timer->revision == 1)
+		l = readl_relaxed(timer->irq_ena) & ~mask;
+
+	writel_relaxed(l, timer->irq_dis);
+	l = omap_dm_timer_read_reg(timer, OMAP_TIMER_WAKEUP_EN_REG) & ~mask;
+	omap_dm_timer_write_reg(timer, OMAP_TIMER_WAKEUP_EN_REG, l);
+
+	/* Save the context */
+	timer->context.tier &= ~mask;
+	timer->context.twer &= ~mask;
+	omap_dm_timer_disable(timer);
+	return 0;
+}
+
+unsigned int omap_dm_timer_read_status(struct omap_dm_timer *timer)
+{
+	unsigned int l;
+
+	if (unlikely(!timer || pm_runtime_suspended(&timer->pdev->dev))) {
+		pr_err("%s: timer not available or enabled.\n", __func__);
+		return 0;
+	}
+
+	l = readl_relaxed(timer->irq_stat);
+
+	return l;
+}
+
+int omap_dm_timer_write_status(struct omap_dm_timer *timer, unsigned int value)
+{
+	if (unlikely(!timer || pm_runtime_suspended(&timer->pdev->dev)))
+		return -EINVAL;
+
+	__omap_dm_timer_write_status(timer, value);
+
+	return 0;
+}
+
+unsigned int omap_dm_timer_read_counter(struct omap_dm_timer *timer)
+{
+	if (unlikely(!timer || pm_runtime_suspended(&timer->pdev->dev))) {
+		pr_err("%s: timer not iavailable or enabled.\n", __func__);
+		return 0;
+	}
+
+	return __omap_dm_timer_read_counter(timer, timer->posted);
+}
+
+int omap_dm_timer_write_counter(struct omap_dm_timer *timer, unsigned int value)
+{
+	if (unlikely(!timer || pm_runtime_suspended(&timer->pdev->dev))) {
+		pr_err("%s: timer not available or enabled.\n", __func__);
+		return -EINVAL;
+	}
+
+	omap_dm_timer_write_reg(timer, OMAP_TIMER_COUNTER_REG, value);
+
+	/* Save the context */
+	timer->context.tcrr = value;
+	return 0;
+}
+
+int omap_dm_timers_active(void)
+{
+	struct omap_dm_timer *timer;
+
+	list_for_each_entry(timer, &omap_timer_list, node) {
+		if (!timer->reserved)
+			continue;
+
+		if (omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG) &
+		    OMAP_TIMER_CTRL_ST) {
+			return 1;
+		}
+	}
+	return 0;
+}
+
+static const struct of_device_id omap_timer_match[];
+
+/**
+ * omap_dm_timer_probe - probe function called for every registered device
+ * @pdev:	pointer to current timer platform device
+ *
+ * Called by driver framework at the end of device registration for all
+ * timer devices.
+ */
+static int omap_dm_timer_probe(struct platform_device *pdev)
+{
+	unsigned long flags;
+	struct omap_dm_timer *timer;
+	struct resource *mem, *irq;
+	struct device *dev = &pdev->dev;
+	const struct of_device_id *match;
+	const struct dmtimer_platform_data *pdata;
+	int ret;
+
+	match = of_match_device(of_match_ptr(omap_timer_match), dev);
+	pdata = match ? match->data : dev->platform_data;
+
+	if (!pdata && !dev->of_node) {
+		dev_err(dev, "%s: no platform data.\n", __func__);
+		return -ENODEV;
+	}
+
+	irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+	if (unlikely(!irq)) {
+		dev_err(dev, "%s: no IRQ resource.\n", __func__);
+		return -ENODEV;
+	}
+
+	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (unlikely(!mem)) {
+		dev_err(dev, "%s: no memory resource.\n", __func__);
+		return -ENODEV;
+	}
+
+	timer = devm_kzalloc(dev, sizeof(*timer), GFP_KERNEL);
+	if (!timer)
+		return  -ENOMEM;
+
+	timer->fclk = ERR_PTR(-ENODEV);
+	timer->io_base = devm_ioremap_resource(dev, mem);
+	if (IS_ERR(timer->io_base))
+		return PTR_ERR(timer->io_base);
+
+	if (dev->of_node) {
+		if (of_find_property(dev->of_node, "ti,timer-alwon", NULL))
+			timer->capability |= OMAP_TIMER_ALWON;
+		if (of_find_property(dev->of_node, "ti,timer-dsp", NULL))
+			timer->capability |= OMAP_TIMER_HAS_DSP_IRQ;
+		if (of_find_property(dev->of_node, "ti,timer-pwm", NULL))
+			timer->capability |= OMAP_TIMER_HAS_PWM;
+		if (of_find_property(dev->of_node, "ti,timer-secure", NULL))
+			timer->capability |= OMAP_TIMER_SECURE;
+	} else {
+		timer->id = pdev->id;
+		timer->capability = pdata->timer_capability;
+		timer->reserved = omap_dm_timer_reserved_systimer(timer->id);
+		timer->get_context_loss_count = pdata->get_context_loss_count;
+	}
+
+	if (pdata)
+		timer->errata = pdata->timer_errata;
+
+	timer->irq = irq->start;
+	timer->pdev = pdev;
+
+	/* Skip pm_runtime_enable for OMAP1 */
+	if (!(timer->capability & OMAP_TIMER_NEEDS_RESET)) {
+		pm_runtime_enable(dev);
+		pm_runtime_irq_safe(dev);
+	}
+
+	if (!timer->reserved) {
+		ret = pm_runtime_get_sync(dev);
+		if (ret < 0) {
+			dev_err(dev, "%s: pm_runtime_get_sync failed!\n",
+				__func__);
+			goto err_get_sync;
+		}
+		__omap_dm_timer_init_regs(timer);
+		pm_runtime_put(dev);
+	}
+
+	/* add the timer element to the list */
+	spin_lock_irqsave(&dm_timer_lock, flags);
+	list_add_tail(&timer->node, &omap_timer_list);
+	spin_unlock_irqrestore(&dm_timer_lock, flags);
+
+	dev_dbg(dev, "Device Probed.\n");
+
+	return 0;
+
+err_get_sync:
+	pm_runtime_put_noidle(dev);
+	pm_runtime_disable(dev);
+	return ret;
+}
+
+/**
+ * omap_dm_timer_remove - cleanup a registered timer device
+ * @pdev:	pointer to current timer platform device
+ *
+ * Called by driver framework whenever a timer device is unregistered.
+ * In addition to freeing platform resources it also deletes the timer
+ * entry from the local list.
+ */
+static int omap_dm_timer_remove(struct platform_device *pdev)
+{
+	struct omap_dm_timer *timer;
+	unsigned long flags;
+	int ret = -EINVAL;
+
+	spin_lock_irqsave(&dm_timer_lock, flags);
+	list_for_each_entry(timer, &omap_timer_list, node)
+		if (!strcmp(dev_name(&timer->pdev->dev),
+			    dev_name(&pdev->dev))) {
+			list_del(&timer->node);
+			ret = 0;
+			break;
+		}
+	spin_unlock_irqrestore(&dm_timer_lock, flags);
+
+	pm_runtime_disable(&pdev->dev);
+
+	return ret;
+}
+
+static const struct dmtimer_platform_data omap3plus_pdata = {
+	.timer_errata = OMAP_TIMER_ERRATA_I103_I767,
+};
+
+static const struct of_device_id omap_timer_match[] = {
+	{
+		.compatible = "ti,omap2420-timer",
+	},
+	{
+		.compatible = "ti,omap3430-timer",
+		.data = &omap3plus_pdata,
+	},
+	{
+		.compatible = "ti,omap4430-timer",
+		.data = &omap3plus_pdata,
+	},
+	{
+		.compatible = "ti,omap5430-timer",
+		.data = &omap3plus_pdata,
+	},
+	{
+		.compatible = "ti,am335x-timer",
+		.data = &omap3plus_pdata,
+	},
+	{
+		.compatible = "ti,am335x-timer-1ms",
+		.data = &omap3plus_pdata,
+	},
+	{
+		.compatible = "ti,dm816-timer",
+		.data = &omap3plus_pdata,
+	},
+	{},
+};
+MODULE_DEVICE_TABLE(of, omap_timer_match);
+
+static struct platform_driver omap_dm_timer_driver = {
+	.probe  = omap_dm_timer_probe,
+	.remove = omap_dm_timer_remove,
+	.driver = {
+		.name   = "omap_timer",
+		.of_match_table = of_match_ptr(omap_timer_match),
+	},
+};
+
+early_platform_init("earlytimer", &omap_dm_timer_driver);
+module_platform_driver(omap_dm_timer_driver);
+
+MODULE_DESCRIPTION("OMAP Dual-Mode Timer Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRIVER_NAME);
+MODULE_AUTHOR("Texas Instruments Inc");