1. 根目录:
2. arch
3. arm
4. plat-nomadik
5. include
6. plat
7. mtu.h

#ifndef __PLAT_MTU_H
#define __PLAT_MTU_H

/*
 * Guaranteed runtime conversion range in seconds for
 * the clocksource and clockevent.
 */
#define MTU_MIN_RANGE 4

/* should be set by the platform code */
extern void __iomem *mtu_base;

/*
 * The MTU device hosts four different counters, with 4 set of
 * registers. These are register names.
 */

#define MTU_IMSC	0x00	/* Interrupt mask set/clear */
#define MTU_RIS		0x04	/* Raw interrupt status */
#define MTU_MIS		0x08	/* Masked interrupt status */
#define MTU_ICR		0x0C	/* Interrupt clear register */

/* per-timer registers take 0..3 as argument */
#define MTU_LR(x)	(0x10 + 0x10 * (x) + 0x00)	/* Load value */
#define MTU_VAL(x)	(0x10 + 0x10 * (x) + 0x04)	/* Current value */
#define MTU_CR(x)	(0x10 + 0x10 * (x) + 0x08)	/* Control reg */
#define MTU_BGLR(x)	(0x10 + 0x10 * (x) + 0x0c)	/* At next overflow */

/* bits for the control register */
#define MTU_CRn_ENA		0x80
#define MTU_CRn_PERIODIC	0x40	/* if 0 = free-running */
#define MTU_CRn_PRESCALE_MASK	0x0c
#define MTU_CRn_PRESCALE_1		0x00
#define MTU_CRn_PRESCALE_16		0x04
#define MTU_CRn_PRESCALE_256		0x08
#define MTU_CRn_32BITS		0x02
#define MTU_CRn_ONESHOT		0x01	/* if 0 = wraps reloading from BGLR*/

/* Other registers are usual amba/primecell registers, currently not used */
#define MTU_ITCR	0xff0
#define MTU_ITOP	0xff4

#define MTU_PERIPH_ID0	0xfe0
#define MTU_PERIPH_ID1	0xfe4
#define MTU_PERIPH_ID2	0xfe8
#define MTU_PERIPH_ID3	0xfeC

#define MTU_PCELL0	0xff0
#define MTU_PCELL1	0xff4
#define MTU_PCELL2	0xff8
#define MTU_PCELL3	0xffC

#endif /* __PLAT_MTU_H */