arm: introduce cross trigger interface helpers

#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