arch/arm/plat-omap/dmtimer.c - maze/linux - Git at Google

 /*
  * linux/arch/arm/plat-omap/dmtimer.c
  *
  * OMAP Dual-Mode Timers
  *
  * Copyright (C) 2005 Nokia Corporation
  * OMAP2 support by Juha Yrjola
  * API improvements and OMAP2 clock framework support by Timo Teras
  *
  * 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/init.h>
 #include <linux/spinlock.h>
 #include <linux/errno.h>
 #include <linux/list.h>
 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <asm/hardware.h>
 #include <asm/arch/dmtimer.h>
 #include <asm/io.h>
 #include <asm/arch/irqs.h>

 /* register offsets */
 #define OMAP_TIMER_ID_REG		0x00
 #define OMAP_TIMER_OCP_CFG_REG		0x10
 #define OMAP_TIMER_SYS_STAT_REG		0x14
 #define OMAP_TIMER_STAT_REG		0x18
 #define OMAP_TIMER_INT_EN_REG		0x1c
 #define OMAP_TIMER_WAKEUP_EN_REG	0x20
 #define OMAP_TIMER_CTRL_REG		0x24
 #define OMAP_TIMER_COUNTER_REG		0x28
 #define OMAP_TIMER_LOAD_REG		0x2c
 #define OMAP_TIMER_TRIGGER_REG		0x30
 #define OMAP_TIMER_WRITE_PEND_REG 	0x34
 #define OMAP_TIMER_MATCH_REG		0x38
 #define OMAP_TIMER_CAPTURE_REG		0x3c
 #define OMAP_TIMER_IF_CTRL_REG		0x40

 /* timer control reg bits */
 #define OMAP_TIMER_CTRL_GPOCFG		(1 << 14)
 #define OMAP_TIMER_CTRL_CAPTMODE	(1 << 13)
 #define OMAP_TIMER_CTRL_PT		(1 << 12)
 #define OMAP_TIMER_CTRL_TCM_LOWTOHIGH	(0x1 << 8)
 #define OMAP_TIMER_CTRL_TCM_HIGHTOLOW	(0x2 << 8)
 #define OMAP_TIMER_CTRL_TCM_BOTHEDGES	(0x3 << 8)
 #define OMAP_TIMER_CTRL_SCPWM		(1 << 7)
 #define OMAP_TIMER_CTRL_CE		(1 << 6)	/* compare enable */
 #define OMAP_TIMER_CTRL_PRE		(1 << 5)	/* prescaler enable */
 #define OMAP_TIMER_CTRL_PTV_SHIFT	2		/* how much to shift the prescaler value */
 #define OMAP_TIMER_CTRL_AR		(1 << 1)	/* auto-reload enable */
 #define OMAP_TIMER_CTRL_ST		(1 << 0)	/* start timer */

 struct omap_dm_timer {
 	unsigned long phys_base;
 	int irq;
 #ifdef CONFIG_ARCH_OMAP2
 	struct clk *iclk, *fclk;
 #endif
 	void __iomem *io_base;
 	unsigned reserved:1;
 };

 #ifdef CONFIG_ARCH_OMAP1

 static struct omap_dm_timer dm_timers[] = {
 	{ .phys_base = 0xfffb1400, .irq = INT_1610_GPTIMER1 },
 	{ .phys_base = 0xfffb1c00, .irq = INT_1610_GPTIMER2 },
 	{ .phys_base = 0xfffb2400, .irq = INT_1610_GPTIMER3 },
 	{ .phys_base = 0xfffb2c00, .irq = INT_1610_GPTIMER4 },
 	{ .phys_base = 0xfffb3400, .irq = INT_1610_GPTIMER5 },
 	{ .phys_base = 0xfffb3c00, .irq = INT_1610_GPTIMER6 },
 	{ .phys_base = 0xfffb4400, .irq = INT_1610_GPTIMER7 },
 	{ .phys_base = 0xfffb4c00, .irq = INT_1610_GPTIMER8 },
 };

 #elif defined(CONFIG_ARCH_OMAP2)

 static struct omap_dm_timer dm_timers[] = {
 	{ .phys_base = 0x48028000, .irq = INT_24XX_GPTIMER1 },
 	{ .phys_base = 0x4802a000, .irq = INT_24XX_GPTIMER2 },
 	{ .phys_base = 0x48078000, .irq = INT_24XX_GPTIMER3 },
 	{ .phys_base = 0x4807a000, .irq = INT_24XX_GPTIMER4 },
 	{ .phys_base = 0x4807c000, .irq = INT_24XX_GPTIMER5 },
 	{ .phys_base = 0x4807e000, .irq = INT_24XX_GPTIMER6 },
 	{ .phys_base = 0x48080000, .irq = INT_24XX_GPTIMER7 },
 	{ .phys_base = 0x48082000, .irq = INT_24XX_GPTIMER8 },
 	{ .phys_base = 0x48084000, .irq = INT_24XX_GPTIMER9 },
 	{ .phys_base = 0x48086000, .irq = INT_24XX_GPTIMER10 },
 	{ .phys_base = 0x48088000, .irq = INT_24XX_GPTIMER11 },
 	{ .phys_base = 0x4808a000, .irq = INT_24XX_GPTIMER12 },
 };

 static const char *dm_source_names[] = {
 	"sys_ck",
 	"func_32k_ck",
 	"alt_ck"
 };

 static struct clk *dm_source_clocks[3];

 #else

 #error OMAP architecture not supported!

 #endif

 static const int dm_timer_count = ARRAY_SIZE(dm_timers);
 static spinlock_t dm_timer_lock;

 static inline u32 omap_dm_timer_read_reg(struct omap_dm_timer *timer, int reg)
 {
 	return readl(timer->io_base + reg);
 }

 static void omap_dm_timer_write_reg(struct omap_dm_timer *timer, int reg, u32 value)
 {
 	writel(value, timer->io_base + reg);
 	while (omap_dm_timer_read_reg(timer, OMAP_TIMER_WRITE_PEND_REG))
 		;
 }

 static void omap_dm_timer_wait_for_reset(struct omap_dm_timer *timer)
 {
 	int c;

 	c = 0;
 	while (!(omap_dm_timer_read_reg(timer, OMAP_TIMER_SYS_STAT_REG) & 1)) {
 		c++;
 		if (c > 100000) {
 			printk(KERN_ERR "Timer failed to reset\n");
 			return;
 		}
 	}
 }

 static void omap_dm_timer_reset(struct omap_dm_timer *timer)
 {
 	u32 l;

 	if (timer != &dm_timers[0]) {
 		omap_dm_timer_write_reg(timer, OMAP_TIMER_IF_CTRL_REG, 0x06);
 		omap_dm_timer_wait_for_reset(timer);
 	}
 	omap_dm_timer_set_source(timer, OMAP_TIMER_SRC_SYS_CLK);

 	/* Set to smart-idle mode */
 	l = omap_dm_timer_read_reg(timer, OMAP_TIMER_OCP_CFG_REG);
 	l |= 0x02 << 3;
 	omap_dm_timer_write_reg(timer, OMAP_TIMER_OCP_CFG_REG, l);
 }

 static void omap_dm_timer_prepare(struct omap_dm_timer *timer)
 {
 #ifdef CONFIG_ARCH_OMAP2
 	clk_enable(timer->iclk);
 	clk_enable(timer->fclk);
 #endif
 	omap_dm_timer_reset(timer);
 }

 struct omap_dm_timer *omap_dm_timer_request(void)
 {
 	struct omap_dm_timer *timer = NULL;
 	unsigned long flags;
 	int i;

 	spin_lock_irqsave(&dm_timer_lock, flags);
 	for (i = 0; i < dm_timer_count; i++) {
 		if (dm_timers[i].reserved)
 			continue;

 		timer = &dm_timers[i];
 		timer->reserved = 1;
 		break;
 	}
 	spin_unlock_irqrestore(&dm_timer_lock, flags);

 	if (timer != NULL)
 		omap_dm_timer_prepare(timer);

 	return timer;
 }

 struct omap_dm_timer *omap_dm_timer_request_specific(int id)
 {
 	struct omap_dm_timer *timer;
 	unsigned long flags;

 	spin_lock_irqsave(&dm_timer_lock, flags);
 	if (id <= 0 || id > dm_timer_count || dm_timers[id-1].reserved) {
 		spin_unlock_irqrestore(&dm_timer_lock, flags);
 		printk("BUG: warning at %s:%d/%s(): unable to get timer %d\n",
 		       __FILE__, __LINE__, __FUNCTION__, id);
 		dump_stack();
 		return NULL;
 	}

 	timer = &dm_timers[id-1];
 	timer->reserved = 1;
 	spin_unlock_irqrestore(&dm_timer_lock, flags);

 	omap_dm_timer_prepare(timer);

 	return timer;
 }

 void omap_dm_timer_free(struct omap_dm_timer *timer)
 {
 	omap_dm_timer_reset(timer);
 #ifdef CONFIG_ARCH_OMAP2
 	clk_disable(timer->iclk);
 	clk_disable(timer->fclk);
 #endif
 	WARN_ON(!timer->reserved);
 	timer->reserved = 0;
 }

 int omap_dm_timer_get_irq(struct omap_dm_timer *timer)
 {
 	return timer->irq;
 }

 #if defined(CONFIG_ARCH_OMAP1)

 struct clk *omap_dm_timer_get_fclk(struct omap_dm_timer *timer)
 {
 	BUG();
 }

 /**
  * 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;

 	/* 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 */
 	for (i = 0; i < dm_timer_count; i++) {
 		u32 l;

 		l = omap_dm_timer_read_reg(&dm_timers[i], 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);
 		}
 	}

 	return inputmask;
 }

 #elif defined(CONFIG_ARCH_OMAP2)

 struct clk *omap_dm_timer_get_fclk(struct omap_dm_timer *timer)
 {
         return timer->fclk;
 }

 __u32 omap_dm_timer_modify_idlect_mask(__u32 inputmask)
 {
 	BUG();
 }

 #endif

 void omap_dm_timer_trigger(struct omap_dm_timer *timer)
 {
 	omap_dm_timer_write_reg(timer, OMAP_TIMER_TRIGGER_REG, 0);
 }

 void omap_dm_timer_start(struct omap_dm_timer *timer)
 {
 	u32 l;

 	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);
 	}
 }

 void omap_dm_timer_stop(struct omap_dm_timer *timer)
 {
 	u32 l;

 	l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
 	if (l & OMAP_TIMER_CTRL_ST) {
 		l &= ~0x1;
 		omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
 	}
 }

 #ifdef CONFIG_ARCH_OMAP1

 void omap_dm_timer_set_source(struct omap_dm_timer *timer, int source)
 {
 	int n = (timer - dm_timers) << 1;
 	u32 l;

 	l = omap_readl(MOD_CONF_CTRL_1) & ~(0x03 << n);
 	l |= source << n;
 	omap_writel(l, MOD_CONF_CTRL_1);
 }

 #else

 void omap_dm_timer_set_source(struct omap_dm_timer *timer, int source)
 {
 	if (source < 0 || source >= 3)
 		return;

 	clk_disable(timer->fclk);
 	clk_set_parent(timer->fclk, dm_source_clocks[source]);
 	clk_enable(timer->fclk);

 	/* When the functional clock disappears, too quick writes seem to
 	 * cause an abort. */
 	__delay(15000);
 }

 #endif

 void omap_dm_timer_set_load(struct omap_dm_timer *timer, int autoreload,
 			    unsigned int load)
 {
 	u32 l;

 	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);
 }

 void omap_dm_timer_set_match(struct omap_dm_timer *timer, int enable,
 			     unsigned int match)
 {
 	u32 l;

 	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_CTRL_REG, l);
 	omap_dm_timer_write_reg(timer, OMAP_TIMER_MATCH_REG, match);
 }


 void omap_dm_timer_set_pwm(struct omap_dm_timer *timer, int def_on,
 			   int toggle, int trigger)
 {
 	u32 l;

 	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);
 }

 void omap_dm_timer_set_prescaler(struct omap_dm_timer *timer, int prescaler)
 {
 	u32 l;

 	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);
 }

 void omap_dm_timer_set_int_enable(struct omap_dm_timer *timer,
 				  unsigned int value)
 {
 	omap_dm_timer_write_reg(timer, OMAP_TIMER_INT_EN_REG, value);
 }

 unsigned int omap_dm_timer_read_status(struct omap_dm_timer *timer)
 {
 	return omap_dm_timer_read_reg(timer, OMAP_TIMER_STAT_REG);
 }

 void omap_dm_timer_write_status(struct omap_dm_timer *timer, unsigned int value)
 {
 	omap_dm_timer_write_reg(timer, OMAP_TIMER_STAT_REG, value);
 }

 unsigned int omap_dm_timer_read_counter(struct omap_dm_timer *timer)
 {
 	return omap_dm_timer_read_reg(timer, OMAP_TIMER_COUNTER_REG);
 }

 void omap_dm_timer_write_counter(struct omap_dm_timer *timer, unsigned int value)
 {
 	return omap_dm_timer_write_reg(timer, OMAP_TIMER_COUNTER_REG, value);
 }

 int omap_dm_timers_active(void)
 {
 	int i;

 	for (i = 0; i < dm_timer_count; i++) {
 		struct omap_dm_timer *timer;

 		timer = &dm_timers[i];
 		if (omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG) &
 		    OMAP_TIMER_CTRL_ST)
 			return 1;
 	}
 	return 0;
 }

 int omap_dm_timer_init(void)
 {
 	struct omap_dm_timer *timer;
 	int i;

 	if (!(cpu_is_omap16xx() || cpu_is_omap24xx()))
 		return -ENODEV;

 	spin_lock_init(&dm_timer_lock);
 #ifdef CONFIG_ARCH_OMAP2
 	for (i = 0; i < ARRAY_SIZE(dm_source_names); i++) {
 		dm_source_clocks[i] = clk_get(NULL, dm_source_names[i]);
 		BUG_ON(dm_source_clocks[i] == NULL);
 	}
 #endif

 	for (i = 0; i < dm_timer_count; i++) {
 #ifdef CONFIG_ARCH_OMAP2
 		char clk_name[16];
 #endif

 		timer = &dm_timers[i];
 		timer->io_base = (void __iomem *) io_p2v(timer->phys_base);
 #ifdef CONFIG_ARCH_OMAP2
 		sprintf(clk_name, "gpt%d_ick", i + 1);
 		timer->iclk = clk_get(NULL, clk_name);
 		sprintf(clk_name, "gpt%d_fck", i + 1);
 		timer->fclk = clk_get(NULL, clk_name);
 #endif
 	}

 	return 0;
 }
	/*
	* linux/arch/arm/plat-omap/dmtimer.c
	*
	* OMAP Dual-Mode Timers
	*
	* Copyright (C) 2005 Nokia Corporation
	* OMAP2 support by Juha Yrjola
	* API improvements and OMAP2 clock framework support by Timo Teras
	*
	* 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/init.h>
	#include <linux/spinlock.h>
	#include <linux/errno.h>
	#include <linux/list.h>
	#include <linux/clk.h>
	#include <linux/delay.h>
	#include <asm/hardware.h>
	#include <asm/arch/dmtimer.h>
	#include <asm/io.h>
	#include <asm/arch/irqs.h>

	/* register offsets */
	#define OMAP_TIMER_ID_REG 0x00
	#define OMAP_TIMER_OCP_CFG_REG 0x10
	#define OMAP_TIMER_SYS_STAT_REG 0x14
	#define OMAP_TIMER_STAT_REG 0x18
	#define OMAP_TIMER_INT_EN_REG 0x1c
	#define OMAP_TIMER_WAKEUP_EN_REG 0x20
	#define OMAP_TIMER_CTRL_REG 0x24
	#define OMAP_TIMER_COUNTER_REG 0x28
	#define OMAP_TIMER_LOAD_REG 0x2c
	#define OMAP_TIMER_TRIGGER_REG 0x30
	#define OMAP_TIMER_WRITE_PEND_REG 0x34
	#define OMAP_TIMER_MATCH_REG 0x38
	#define OMAP_TIMER_CAPTURE_REG 0x3c
	#define OMAP_TIMER_IF_CTRL_REG 0x40

	/* timer control reg bits */
	#define OMAP_TIMER_CTRL_GPOCFG (1 << 14)
	#define OMAP_TIMER_CTRL_CAPTMODE (1 << 13)
	#define OMAP_TIMER_CTRL_PT (1 << 12)
	#define OMAP_TIMER_CTRL_TCM_LOWTOHIGH (0x1 << 8)
	#define OMAP_TIMER_CTRL_TCM_HIGHTOLOW (0x2 << 8)
	#define OMAP_TIMER_CTRL_TCM_BOTHEDGES (0x3 << 8)
	#define OMAP_TIMER_CTRL_SCPWM (1 << 7)
	#define OMAP_TIMER_CTRL_CE (1 << 6) /* compare enable */
	#define OMAP_TIMER_CTRL_PRE (1 << 5) /* prescaler enable */
	#define OMAP_TIMER_CTRL_PTV_SHIFT 2 /* how much to shift the prescaler value */
	#define OMAP_TIMER_CTRL_AR (1 << 1) /* auto-reload enable */
	#define OMAP_TIMER_CTRL_ST (1 << 0) /* start timer */

	struct omap_dm_timer {
	unsigned long phys_base;
	int irq;
	#ifdef CONFIG_ARCH_OMAP2
	struct clk iclk, fclk;
	#endif
	void __iomem *io_base;
	unsigned reserved:1;
	};

	#ifdef CONFIG_ARCH_OMAP1

	static struct omap_dm_timer dm_timers[] = {
	{ .phys_base = 0xfffb1400, .irq = INT_1610_GPTIMER1 },
	{ .phys_base = 0xfffb1c00, .irq = INT_1610_GPTIMER2 },
	{ .phys_base = 0xfffb2400, .irq = INT_1610_GPTIMER3 },
	{ .phys_base = 0xfffb2c00, .irq = INT_1610_GPTIMER4 },
	{ .phys_base = 0xfffb3400, .irq = INT_1610_GPTIMER5 },
	{ .phys_base = 0xfffb3c00, .irq = INT_1610_GPTIMER6 },
	{ .phys_base = 0xfffb4400, .irq = INT_1610_GPTIMER7 },
	{ .phys_base = 0xfffb4c00, .irq = INT_1610_GPTIMER8 },
	};

	#elif defined(CONFIG_ARCH_OMAP2)

	static struct omap_dm_timer dm_timers[] = {
	{ .phys_base = 0x48028000, .irq = INT_24XX_GPTIMER1 },
	{ .phys_base = 0x4802a000, .irq = INT_24XX_GPTIMER2 },
	{ .phys_base = 0x48078000, .irq = INT_24XX_GPTIMER3 },
	{ .phys_base = 0x4807a000, .irq = INT_24XX_GPTIMER4 },
	{ .phys_base = 0x4807c000, .irq = INT_24XX_GPTIMER5 },
	{ .phys_base = 0x4807e000, .irq = INT_24XX_GPTIMER6 },
	{ .phys_base = 0x48080000, .irq = INT_24XX_GPTIMER7 },
	{ .phys_base = 0x48082000, .irq = INT_24XX_GPTIMER8 },
	{ .phys_base = 0x48084000, .irq = INT_24XX_GPTIMER9 },
	{ .phys_base = 0x48086000, .irq = INT_24XX_GPTIMER10 },
	{ .phys_base = 0x48088000, .irq = INT_24XX_GPTIMER11 },
	{ .phys_base = 0x4808a000, .irq = INT_24XX_GPTIMER12 },
	};

	static const char *dm_source_names[] = {
	"sys_ck",
	"func_32k_ck",
	"alt_ck"
	};

	static struct clk *dm_source_clocks[3];

	#else

	#error OMAP architecture not supported!

	#endif

	static const int dm_timer_count = ARRAY_SIZE(dm_timers);
	static spinlock_t dm_timer_lock;

	static inline u32 omap_dm_timer_read_reg(struct omap_dm_timer *timer, int reg)
	{
	return readl(timer->io_base + reg);
	}

	static void omap_dm_timer_write_reg(struct omap_dm_timer *timer, int reg, u32 value)
	{
	writel(value, timer->io_base + reg);
	while (omap_dm_timer_read_reg(timer, OMAP_TIMER_WRITE_PEND_REG))
	;
	}

	static void omap_dm_timer_wait_for_reset(struct omap_dm_timer *timer)
	{
	int c;

	c = 0;
	while (!(omap_dm_timer_read_reg(timer, OMAP_TIMER_SYS_STAT_REG) & 1)) {
	c++;
	if (c > 100000) {
	printk(KERN_ERR "Timer failed to reset\n");
	return;
	}
	}
	}

	static void omap_dm_timer_reset(struct omap_dm_timer *timer)
	{
	u32 l;

	if (timer != &dm_timers[0]) {
	omap_dm_timer_write_reg(timer, OMAP_TIMER_IF_CTRL_REG, 0x06);
	omap_dm_timer_wait_for_reset(timer);
	}
	omap_dm_timer_set_source(timer, OMAP_TIMER_SRC_SYS_CLK);

	/* Set to smart-idle mode */
	l = omap_dm_timer_read_reg(timer, OMAP_TIMER_OCP_CFG_REG);
	l \|= 0x02 << 3;
	omap_dm_timer_write_reg(timer, OMAP_TIMER_OCP_CFG_REG, l);
	}

	static void omap_dm_timer_prepare(struct omap_dm_timer *timer)
	{
	#ifdef CONFIG_ARCH_OMAP2
	clk_enable(timer->iclk);
	clk_enable(timer->fclk);
	#endif
	omap_dm_timer_reset(timer);
	}

	struct omap_dm_timer *omap_dm_timer_request(void)
	{
	struct omap_dm_timer *timer = NULL;
	unsigned long flags;
	int i;

	spin_lock_irqsave(&dm_timer_lock, flags);
	for (i = 0; i < dm_timer_count; i++) {
	if (dm_timers[i].reserved)
	continue;

	timer = &dm_timers[i];
	timer->reserved = 1;
	break;
	}
	spin_unlock_irqrestore(&dm_timer_lock, flags);

	if (timer != NULL)
	omap_dm_timer_prepare(timer);

	return timer;
	}

	struct omap_dm_timer *omap_dm_timer_request_specific(int id)
	{
	struct omap_dm_timer *timer;
	unsigned long flags;

	spin_lock_irqsave(&dm_timer_lock, flags);
	if (id <= 0 \|\| id > dm_timer_count \|\| dm_timers[id-1].reserved) {
	spin_unlock_irqrestore(&dm_timer_lock, flags);
	printk("BUG: warning at %s:%d/%s(): unable to get timer %d\n",
	__FILE__, __LINE__, __FUNCTION__, id);
	dump_stack();
	return NULL;
	}

	timer = &dm_timers[id-1];
	timer->reserved = 1;
	spin_unlock_irqrestore(&dm_timer_lock, flags);

	omap_dm_timer_prepare(timer);

	return timer;
	}

	void omap_dm_timer_free(struct omap_dm_timer *timer)
	{
	omap_dm_timer_reset(timer);
	#ifdef CONFIG_ARCH_OMAP2
	clk_disable(timer->iclk);
	clk_disable(timer->fclk);
	#endif
	WARN_ON(!timer->reserved);
	timer->reserved = 0;
	}

	int omap_dm_timer_get_irq(struct omap_dm_timer *timer)
	{
	return timer->irq;
	}

	#if defined(CONFIG_ARCH_OMAP1)

	struct clk omap_dm_timer_get_fclk(struct omap_dm_timer timer)
	{
	BUG();
	}

	/**
	* 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;

	/* 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 */
	for (i = 0; i < dm_timer_count; i++) {
	u32 l;

	l = omap_dm_timer_read_reg(&dm_timers[i], 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);
	}
	}

	return inputmask;
	}

	#elif defined(CONFIG_ARCH_OMAP2)

	struct clk omap_dm_timer_get_fclk(struct omap_dm_timer timer)
	{
	return timer->fclk;
	}

	__u32 omap_dm_timer_modify_idlect_mask(__u32 inputmask)
	{
	BUG();
	}

	#endif

	void omap_dm_timer_trigger(struct omap_dm_timer *timer)
	{
	omap_dm_timer_write_reg(timer, OMAP_TIMER_TRIGGER_REG, 0);
	}

	void omap_dm_timer_start(struct omap_dm_timer *timer)
	{
	u32 l;

	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);
	}
	}

	void omap_dm_timer_stop(struct omap_dm_timer *timer)
	{
	u32 l;

	l = omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG);
	if (l & OMAP_TIMER_CTRL_ST) {
	l &= ~0x1;
	omap_dm_timer_write_reg(timer, OMAP_TIMER_CTRL_REG, l);
	}
	}

	#ifdef CONFIG_ARCH_OMAP1

	void omap_dm_timer_set_source(struct omap_dm_timer *timer, int source)
	{
	int n = (timer - dm_timers) << 1;
	u32 l;

	l = omap_readl(MOD_CONF_CTRL_1) & ~(0x03 << n);
	l \|= source << n;
	omap_writel(l, MOD_CONF_CTRL_1);
	}

	#else

	void omap_dm_timer_set_source(struct omap_dm_timer *timer, int source)
	{
	if (source < 0 \|\| source >= 3)
	return;

	clk_disable(timer->fclk);
	clk_set_parent(timer->fclk, dm_source_clocks[source]);
	clk_enable(timer->fclk);

	/* When the functional clock disappears, too quick writes seem to
	* cause an abort. */
	__delay(15000);
	}

	#endif

	void omap_dm_timer_set_load(struct omap_dm_timer *timer, int autoreload,
	unsigned int load)
	{
	u32 l;

	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);
	}

	void omap_dm_timer_set_match(struct omap_dm_timer *timer, int enable,
	unsigned int match)
	{
	u32 l;

	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_CTRL_REG, l);
	omap_dm_timer_write_reg(timer, OMAP_TIMER_MATCH_REG, match);
	}


	void omap_dm_timer_set_pwm(struct omap_dm_timer *timer, int def_on,
	int toggle, int trigger)
	{
	u32 l;

	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);
	}

	void omap_dm_timer_set_prescaler(struct omap_dm_timer *timer, int prescaler)
	{
	u32 l;

	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);
	}

	void omap_dm_timer_set_int_enable(struct omap_dm_timer *timer,
	unsigned int value)
	{
	omap_dm_timer_write_reg(timer, OMAP_TIMER_INT_EN_REG, value);
	}

	unsigned int omap_dm_timer_read_status(struct omap_dm_timer *timer)
	{
	return omap_dm_timer_read_reg(timer, OMAP_TIMER_STAT_REG);
	}

	void omap_dm_timer_write_status(struct omap_dm_timer *timer, unsigned int value)
	{
	omap_dm_timer_write_reg(timer, OMAP_TIMER_STAT_REG, value);
	}

	unsigned int omap_dm_timer_read_counter(struct omap_dm_timer *timer)
	{
	return omap_dm_timer_read_reg(timer, OMAP_TIMER_COUNTER_REG);
	}

	void omap_dm_timer_write_counter(struct omap_dm_timer *timer, unsigned int value)
	{
	return omap_dm_timer_write_reg(timer, OMAP_TIMER_COUNTER_REG, value);
	}

	int omap_dm_timers_active(void)
	{
	int i;

	for (i = 0; i < dm_timer_count; i++) {
	struct omap_dm_timer *timer;

	timer = &dm_timers[i];
	if (omap_dm_timer_read_reg(timer, OMAP_TIMER_CTRL_REG) &
	OMAP_TIMER_CTRL_ST)
	return 1;
	}
	return 0;
	}

	int omap_dm_timer_init(void)
	{
	struct omap_dm_timer *timer;
	int i;

	if (!(cpu_is_omap16xx() \|\| cpu_is_omap24xx()))
	return -ENODEV;

	spin_lock_init(&dm_timer_lock);
	#ifdef CONFIG_ARCH_OMAP2
	for (i = 0; i < ARRAY_SIZE(dm_source_names); i++) {
	dm_source_clocks[i] = clk_get(NULL, dm_source_names[i]);
	BUG_ON(dm_source_clocks[i] == NULL);
	}
	#endif

	for (i = 0; i < dm_timer_count; i++) {
	#ifdef CONFIG_ARCH_OMAP2
	char clk_name[16];
	#endif

	timer = &dm_timers[i];
	timer->io_base = (void __iomem *) io_p2v(timer->phys_base);
	#ifdef CONFIG_ARCH_OMAP2
	sprintf(clk_name, "gpt%d_ick", i + 1);
	timer->iclk = clk_get(NULL, clk_name);
	sprintf(clk_name, "gpt%d_fck", i + 1);
	timer->fclk = clk_get(NULL, clk_name);
	#endif
	}

	return 0;
	}