arch/arm/plat-omap/include/plat/dmtimer.h

/*
 * arch/arm/plat-omap/include/mach/dmtimer.h
 *
 * 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>
 *
 * Platform device conversion and hwmod support.
 *
 * Copyright (C) 2005 Nokia Corporation
 * Author: Lauri Leukkunen <lauri.leukkunen@nokia.com>
 * PWM and clock framwork 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/clk.h>
#include <linux/delay.h>

#ifndef __ASM_ARCH_DMTIMER_H
#define __ASM_ARCH_DMTIMER_H

/* clock sources */
#define OMAP_TIMER_SRC_SYS_CLK			0x00
#define OMAP_TIMER_SRC_32_KHZ			0x01
#define OMAP_TIMER_SRC_EXT_CLK			0x02

/* timer interrupt enable bits */
#define OMAP_TIMER_INT_CAPTURE			(1 << 2)
#define OMAP_TIMER_INT_OVERFLOW			(1 << 1)
#define OMAP_TIMER_INT_MATCH			(1 << 0)

/* trigger types */
#define OMAP_TIMER_TRIGGER_NONE			0x00
#define OMAP_TIMER_TRIGGER_OVERFLOW		0x01
#define OMAP_TIMER_TRIGGER_OVERFLOW_AND_COMPARE	0x02

/*
 * IP revision identifier so that Highlander IP
 * in OMAP4 can be distinguished.
 */
#define OMAP_TIMER_IP_VERSION_1                        0x1
struct omap_dm_timer;
extern struct omap_dm_timer *gptimer_wakeup;
struct clk;

int omap_dm_timer_init(void);

struct omap_dm_timer *omap_dm_timer_request(void);
struct omap_dm_timer *omap_dm_timer_request_specific(int timer_id);
void omap_dm_timer_free(struct omap_dm_timer *timer);
void omap_dm_timer_enable(struct omap_dm_timer *timer);
void omap_dm_timer_disable(struct omap_dm_timer *timer);

int omap_dm_timer_get_irq(struct omap_dm_timer *timer);

u32 omap_dm_timer_modify_idlect_mask(u32 inputmask);
struct clk *omap_dm_timer_get_fclk(struct omap_dm_timer *timer);

void omap_dm_timer_trigger(struct omap_dm_timer *timer);
void omap_dm_timer_start(struct omap_dm_timer *timer);
void omap_dm_timer_stop(struct omap_dm_timer *timer);

int omap_dm_timer_set_source(struct omap_dm_timer *timer, int source);
void omap_dm_timer_set_load(struct omap_dm_timer *timer, int autoreload, unsigned int value);
void omap_dm_timer_set_load_start(struct omap_dm_timer *timer, int autoreload, unsigned int value);
void omap_dm_timer_set_match(struct omap_dm_timer *timer, int enable, unsigned int match);
void omap_dm_timer_set_pwm(struct omap_dm_timer *timer, int def_on, int toggle, int trigger);
void omap_dm_timer_set_prescaler(struct omap_dm_timer *timer, int prescaler);

void omap_dm_timer_set_int_enable(struct omap_dm_timer *timer, unsigned int value);

unsigned int omap_dm_timer_read_status(struct omap_dm_timer *timer);
void omap_dm_timer_write_status(struct omap_dm_timer *timer, unsigned int value);
unsigned int omap_dm_timer_read_counter(struct omap_dm_timer *timer);
void omap_dm_timer_write_counter(struct omap_dm_timer *timer, unsigned int value);

int omap_dm_timers_active(void);

/*
 * Do not use the defines below, they are not needed. They should be only
 * used by dmtimer.c and sys_timer related code.
 */

/* register offsets */
#define _OMAP_TIMER_ID_OFFSET		0x00
#define _OMAP_TIMER_OCP_CFG_OFFSET	0x10
#define _OMAP_TIMER_SYS_STAT_OFFSET	0x14
#define _OMAP_TIMER_STAT_OFFSET		0x18
#define _OMAP_TIMER_INT_EN_OFFSET	0x1c
#define _OMAP_TIMER_WAKEUP_EN_OFFSET	0x20
#define _OMAP_TIMER_CTRL_OFFSET		0x24
#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 /* prescaler value shift */
#define		OMAP_TIMER_CTRL_POSTED		(1 << 2)
#define		OMAP_TIMER_CTRL_AR		(1 << 1) /* auto-reload enable */
#define		OMAP_TIMER_CTRL_ST		(1 << 0) /* start timer */
#define _OMAP_TIMER_COUNTER_OFFSET	0x28
#define _OMAP_TIMER_LOAD_OFFSET		0x2c
#define _OMAP_TIMER_TRIGGER_OFFSET	0x30
#define _OMAP_TIMER_WRITE_PEND_OFFSET	0x34
#define		WP_NONE			0	/* no write pending bit */
#define		WP_TCLR			(1 << 0)
#define		WP_TCRR			(1 << 1)
#define		WP_TLDR			(1 << 2)
#define		WP_TTGR			(1 << 3)
#define		WP_TMAR			(1 << 4)
#define		WP_TPIR			(1 << 5)
#define		WP_TNIR			(1 << 6)
#define		WP_TCVR			(1 << 7)
#define		WP_TOCR			(1 << 8)
#define		WP_TOWR			(1 << 9)
#define _OMAP_TIMER_MATCH_OFFSET	0x38
#define _OMAP_TIMER_CAPTURE_OFFSET	0x3c
#define _OMAP_TIMER_IF_CTRL_OFFSET	0x40
#define _OMAP_TIMER_CAPTURE2_OFFSET		0x44	/* TCAR2, 34xx only */
#define _OMAP_TIMER_TICK_POS_OFFSET		0x48	/* TPIR, 34xx only */
#define _OMAP_TIMER_TICK_NEG_OFFSET		0x4c	/* TNIR, 34xx only */
#define _OMAP_TIMER_TICK_COUNT_OFFSET		0x50	/* TCVR, 34xx only */
#define _OMAP_TIMER_TICK_INT_MASK_SET_OFFSET	0x54	/* TOCR, 34xx only */
#define _OMAP_TIMER_TICK_INT_MASK_COUNT_OFFSET	0x58	/* TOWR, 34xx only */

/* register offsets with the write pending bit encoded */
#define	WPSHIFT					16

#define OMAP_TIMER_ID_REG			(_OMAP_TIMER_ID_OFFSET \
							| (WP_NONE << WPSHIFT))

#define OMAP_TIMER_OCP_CFG_REG			(_OMAP_TIMER_OCP_CFG_OFFSET \
							| (WP_NONE << WPSHIFT))

#define OMAP_TIMER_SYS_STAT_REG			(_OMAP_TIMER_SYS_STAT_OFFSET \
							| (WP_NONE << WPSHIFT))

#define OMAP_TIMER_STAT_REG			(_OMAP_TIMER_STAT_OFFSET \
							| (WP_NONE << WPSHIFT))

#define OMAP_TIMER_INT_EN_REG			(_OMAP_TIMER_INT_EN_OFFSET \
							| (WP_NONE << WPSHIFT))

#define OMAP_TIMER_WAKEUP_EN_REG		(_OMAP_TIMER_WAKEUP_EN_OFFSET \
							| (WP_NONE << WPSHIFT))

#define OMAP_TIMER_CTRL_REG			(_OMAP_TIMER_CTRL_OFFSET \
							| (WP_TCLR << WPSHIFT))

#define OMAP_TIMER_COUNTER_REG			(_OMAP_TIMER_COUNTER_OFFSET \
							| (WP_TCRR << WPSHIFT))

#define OMAP_TIMER_LOAD_REG			(_OMAP_TIMER_LOAD_OFFSET \
							| (WP_TLDR << WPSHIFT))

#define OMAP_TIMER_TRIGGER_REG			(_OMAP_TIMER_TRIGGER_OFFSET \
							| (WP_TTGR << WPSHIFT))

#define OMAP_TIMER_WRITE_PEND_REG		(_OMAP_TIMER_WRITE_PEND_OFFSET \
							| (WP_NONE << WPSHIFT))

#define OMAP_TIMER_MATCH_REG			(_OMAP_TIMER_MATCH_OFFSET \
							| (WP_TMAR << WPSHIFT))

#define OMAP_TIMER_CAPTURE_REG			(_OMAP_TIMER_CAPTURE_OFFSET \
							| (WP_NONE << WPSHIFT))

#define OMAP_TIMER_IF_CTRL_REG			(_OMAP_TIMER_IF_CTRL_OFFSET \
							| (WP_NONE << WPSHIFT))

#define OMAP_TIMER_CAPTURE2_REG			(_OMAP_TIMER_CAPTURE2_OFFSET \
							| (WP_NONE << WPSHIFT))

#define OMAP_TIMER_TICK_POS_REG			(_OMAP_TIMER_TICK_POS_OFFSET \
							| (WP_TPIR << WPSHIFT))

#define OMAP_TIMER_TICK_NEG_REG			(_OMAP_TIMER_TICK_NEG_OFFSET \
							| (WP_TNIR << WPSHIFT))

#define OMAP_TIMER_TICK_COUNT_REG		(_OMAP_TIMER_TICK_COUNT_OFFSET \
							| (WP_TCVR << WPSHIFT))

#define OMAP_TIMER_TICK_INT_MASK_SET_REG				\
		(_OMAP_TIMER_TICK_INT_MASK_SET_OFFSET | (WP_TOCR << WPSHIFT))

#define OMAP_TIMER_TICK_INT_MASK_COUNT_REG				\
		(_OMAP_TIMER_TICK_INT_MASK_COUNT_OFFSET | (WP_TOWR << WPSHIFT))

struct omap_dm_timer {
	unsigned long phys_base;
	int irq;
#ifdef CONFIG_ARCH_OMAP2PLUS
	struct clk *iclk, *fclk;
#endif
	void __iomem *io_base;
	unsigned long rate;
	unsigned reserved:1;
	unsigned enabled:1;
	unsigned posted:1;
};

void omap_dm_timer_prepare(struct omap_dm_timer *timer);

static inline u32 __omap_dm_timer_read(void __iomem *base, u32 reg,
						int posted)
{
	if (posted)
		while (__raw_readl(base + (OMAP_TIMER_WRITE_PEND_REG & 0xff))
				& (reg >> WPSHIFT))
			cpu_relax();

	return __raw_readl(base + (reg & 0xff));
}

static inline void __omap_dm_timer_write(void __iomem *base, u32 reg, u32 val,
						int posted)
{
	if (posted)
		while (__raw_readl(base + (OMAP_TIMER_WRITE_PEND_REG & 0xff))
				& (reg >> WPSHIFT))
			cpu_relax();

	__raw_writel(val, base + (reg & 0xff));
}

/* Assumes the source clock has been set by caller */
static inline void __omap_dm_timer_reset(void __iomem *base, int autoidle,
						int wakeup)
{
	u32 l;

	l = __omap_dm_timer_read(base, OMAP_TIMER_OCP_CFG_REG, 0);
	l |= 0x02 << 3;  /* Set to smart-idle mode */
	l |= 0x2 << 8;   /* Set clock activity to perserve f-clock on idle */

	if (autoidle)
		l |= 0x1 << 0;

	if (wakeup)
		l |= 1 << 2;

	__omap_dm_timer_write(base, OMAP_TIMER_OCP_CFG_REG, l, 0);

	/* Match hardware reset default of posted mode */
	__omap_dm_timer_write(base, OMAP_TIMER_IF_CTRL_REG,
					OMAP_TIMER_CTRL_POSTED, 0);
}

static inline int __omap_dm_timer_set_source(struct clk *timer_fck,
						struct clk *parent)
{
	int ret;

	clk_disable(timer_fck);
	ret = clk_set_parent(timer_fck, parent);
	clk_enable(timer_fck);

	/*
	 * When the functional clock disappears, too quick writes seem
	 * to cause an abort. XXX Is this still necessary?
	 */
	__delay(300000);

	return ret;
}

static inline void __omap_dm_timer_stop(void __iomem *base, int posted,
						unsigned long rate)
{
	u32 l;

	l = __omap_dm_timer_read(base, OMAP_TIMER_CTRL_REG, posted);
	if (l & OMAP_TIMER_CTRL_ST) {
		l &= ~0x1;
		__omap_dm_timer_write(base, OMAP_TIMER_CTRL_REG, l, posted);
#ifdef CONFIG_ARCH_OMAP2PLUS
		/* Readback to make sure write has completed */
		__omap_dm_timer_read(base, OMAP_TIMER_CTRL_REG, posted);
		/*
		 * Wait for functional clock period x 3.5 to make sure that
		 * timer is stopped
		 */
		udelay(3500000 / rate + 1);
#endif
	}

	/* Ack possibly pending interrupt */
	__omap_dm_timer_write(base, OMAP_TIMER_STAT_REG,
					OMAP_TIMER_INT_OVERFLOW, 0);
}

static inline void __omap_dm_timer_load_start(void __iomem *base, u32 ctrl,
						unsigned int load, int posted)
{
	__omap_dm_timer_write(base, OMAP_TIMER_COUNTER_REG, load, posted);
	__omap_dm_timer_write(base, OMAP_TIMER_CTRL_REG, ctrl, posted);
}

static inline void __omap_dm_timer_int_enable(void __iomem *base,
						unsigned int value)
{
	__omap_dm_timer_write(base, OMAP_TIMER_INT_EN_REG, value, 0);
	__omap_dm_timer_write(base, OMAP_TIMER_WAKEUP_EN_REG, value, 0);
}

static inline unsigned int __omap_dm_timer_read_counter(void __iomem *base,
							int posted)
{
	return __omap_dm_timer_read(base, OMAP_TIMER_COUNTER_REG, posted);
}

static inline void __omap_dm_timer_write_status(void __iomem *base,
						unsigned int value)
{
	__omap_dm_timer_write(base, OMAP_TIMER_STAT_REG, value, 0);
}

#endif /* __ASM_ARCH_DMTIMER_H */