linux/arch/arm/include/asm/cti.h

#ifndef __ASMARM_CTI_H
#define __ASMARM_CTI_H

#include	<asm/io.h>

/* The registers' definition is from section 3.2 of
 * Embedded Cross Trigger Revision: r0p0
 */
#define		CTICONTROL		0x000
#define		CTISTATUS		0x004
#define		CTILOCK			0x008
#define		CTIPROTECTION		0x00C
#define		CTIINTACK		0x010
#define		CTIAPPSET		0x014
#define		CTIAPPCLEAR		0x018
#define		CTIAPPPULSE		0x01c
#define		CTIINEN			0x020
#define		CTIOUTEN		0x0A0
#define		CTITRIGINSTATUS		0x130
#define		CTITRIGOUTSTATUS	0x134
#define		CTICHINSTATUS		0x138
#define		CTICHOUTSTATUS		0x13c
#define		CTIPERIPHID0		0xFE0
#define		CTIPERIPHID1		0xFE4
#define		CTIPERIPHID2		0xFE8
#define		CTIPERIPHID3		0xFEC
#define		CTIPCELLID0		0xFF0
#define		CTIPCELLID1		0xFF4
#define		CTIPCELLID2		0xFF8
#define		CTIPCELLID3		0xFFC

/* The below are from section 3.6.4 of
 * CoreSight v1.0 Architecture Specification
 */
#define		LOCKACCESS		0xFB0
#define		LOCKSTATUS		0xFB4

/* write this value to LOCKACCESS will unlock the module, and
 * other value will lock the module
 */
#define		LOCKCODE		0xC5ACCE55

/**
 * struct cti - cross trigger interface struct
 * @base: mapped virtual address for the cti base
 * @irq: irq number for the cti
 * @trig_out_for_irq: triger out number which will cause
 *	the @irq happen
 *
 * cti struct used to operate cti registers.
 */
struct cti {
	void __iomem *base;
	int irq;
	int trig_out_for_irq;
};

/**
 * cti_init - initialize the cti instance
 * @cti: cti instance
 * @base: mapped virtual address for the cti base
 * @irq: irq number for the cti
 * @trig_out: triger out number which will cause
 *	the @irq happen
 *
 * called by machine code to pass the board dependent
 * @base, @irq and @trig_out to cti.
 */
static inline void cti_init(struct cti *cti,
	void __iomem *base, int irq, int trig_out)
{
	cti->base = base;
	cti->irq  = irq;
	cti->trig_out_for_irq = trig_out;
}

/**
 * cti_map_trigger - use the @chan to map @trig_in to @trig_out
 * @cti: cti instance
 * @trig_in: trigger in number
 * @trig_out: trigger out number
 * @channel: channel number
 *
 * This function maps one trigger in of @trig_in to one trigger
 * out of @trig_out using the channel @chan.
 */
static inline void cti_map_trigger(struct cti *cti,
	int trig_in, int trig_out, int chan)
{
	void __iomem *base = cti->base;
	unsigned long val;

	val = __raw_readl(base + CTIINEN + trig_in * 4);
	val |= BIT(chan);
	__raw_writel(val, base + CTIINEN + trig_in * 4);

	val = __raw_readl(base + CTIOUTEN + trig_out * 4);
	val |= BIT(chan);
	__raw_writel(val, base + CTIOUTEN + trig_out * 4);
}

/**
 * cti_enable - enable the cti module
 * @cti: cti instance
 *
 * enable the cti module
 */
static inline void cti_enable(struct cti *cti)
{
	__raw_writel(0x1, cti->base + CTICONTROL);
}

/**
 * cti_disable - disable the cti module
 * @cti: cti instance
 *
 * enable the cti module
 */
static inline void cti_disable(struct cti *cti)
{
	__raw_writel(0, cti->base + CTICONTROL);
}

/**
 * cti_irq_ack - clear the cti irq
 * @cti: cti instance
 *
 * clear the cti irq
 */
static inline void cti_irq_ack(struct cti *cti)
{
	void __iomem *base = cti->base;
	unsigned long val;

	val = __raw_readl(base + CTIINTACK);
	val |= BIT(cti->trig_out_for_irq);
	__raw_writel(val, base + CTIINTACK);
}

/**
 * cti_unlock - unlock cti module
 * @cti: cti instance
 *
 * unlock the cti module, or else any writes to the cti
 * module is not allowed.
 */
static inline void cti_unlock(struct cti *cti)
{
	void __iomem *base = cti->base;
	unsigned long val;

	val = __raw_readl(base + LOCKSTATUS);

	if (val & 1) {
		val = LOCKCODE;
		__raw_writel(val, base + LOCKACCESS);
	}
}

/**
 * cti_lock - lock cti module
 * @cti: cti instance
 *
 * lock the cti module, so any writes to the cti
 * module will be not allowed.
 */
static inline void cti_lock(struct cti *cti)
{
	void __iomem *base = cti->base;
	unsigned long val;

	val = __raw_readl(base + LOCKSTATUS);

	if (!(val & 1)) {
		val = ~LOCKCODE;
		__raw_writel(val, base + LOCKACCESS);
	}
}
#endif