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ARM: Improve documentation in arm_timer.h

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Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2010-01-16 15:07:08 +00:00
parent a285edcf18
commit ba02a21544
1 changed files with 24 additions and 15 deletions
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39
arch/arm/include/asm/hardware/arm_timer.h
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@ -1,21 +1,30 @@
#ifndef __ASM_ARM_HARDWARE_ARM_TIMER_H
#define __ASM_ARM_HARDWARE_ARM_TIMER_H
#define TIMER_LOAD 0x00
#define TIMER_VALUE 0x04
#define TIMER_CTRL 0x08
#define TIMER_CTRL_ONESHOT (1 << 0)
#define TIMER_CTRL_32BIT (1 << 1)
#define TIMER_CTRL_DIV1 (0 << 2)
#define TIMER_CTRL_DIV16 (1 << 2)
#define TIMER_CTRL_DIV256 (2 << 2)
#define TIMER_CTRL_IE (1 << 5) /* Interrupt Enable (versatile only) */
#define TIMER_CTRL_PERIODIC (1 << 6)
#define TIMER_CTRL_ENABLE (1 << 7)
/*
* ARM timer implementation, found in Integrator, Versatile and Realview
* platforms. Not all platforms support all registers and bits in these
* registers, so we mark them with A for Integrator AP, C for Integrator
* CP, V for Versatile and R for Realview.
*
* Integrator AP has 16-bit timers, Integrator CP, Versatile and Realview
* can have 16-bit or 32-bit selectable via a bit in the control register.
*/
#define TIMER_LOAD 0x00 /* ACVR rw */
#define TIMER_VALUE 0x04 /* ACVR ro */
#define TIMER_CTRL 0x08 /* ACVR rw */
#define TIMER_CTRL_ONESHOT (1 << 0) /* CVR */
#define TIMER_CTRL_32BIT (1 << 1) /* CVR */
#define TIMER_CTRL_DIV1 (0 << 2) /* ACVR */
#define TIMER_CTRL_DIV16 (1 << 2) /* ACVR */
#define TIMER_CTRL_DIV256 (2 << 2) /* ACVR */
#define TIMER_CTRL_IE (1 << 5) /* VR */
#define TIMER_CTRL_PERIODIC (1 << 6) /* ACVR */
#define TIMER_CTRL_ENABLE (1 << 7) /* ACVR */
#define TIMER_INTCLR 0x0c
#define TIMER_RIS 0x10
#define TIMER_MIS 0x14
#define TIMER_BGLOAD 0x18
#define TIMER_INTCLR 0x0c /* ACVR wo */
#define TIMER_RIS 0x10 /* CVR ro */
#define TIMER_MIS 0x14 /* CVR ro */
#define TIMER_BGLOAD 0x18 /* CVR rw */
#endif