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drivers: timer: Introduce ARC timer driver

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This commit introduces timer driver for ARC.

ARC timers are configured via ARC AUX registers so we use special
functions to access timer control registers.

This driver allows utilization of either timer0 or timer1
depending on which one is available in real hardware. Essentially
only existing timers should be mentioned in board's Device Tree
description.

Signed-off-by: Vlad Zakharov <vzakhar@synopsys.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Vlad Zakharov
2017-03-21 14:49:47 +03:00
committed by Alexey Brodkin
parent d0ffda8ed2
commit ad9b5f77df
5 changed files with 151 additions and 0 deletions
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4
arch/arc/include/asm/arcregs.h
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@ -33,6 +33,10 @@
#define ARC_AUX_TIMER0_CTRL 0x22 /* Timer 0 control */
#define ARC_AUX_TIMER0_LIMIT 0x23 /* Timer 0 limit */
#define ARC_AUX_TIMER1_CNT 0x100 /* Timer 1 count */
#define ARC_AUX_TIMER1_CTRL 0x101 /* Timer 1 control */
#define ARC_AUX_TIMER1_LIMIT 0x102 /* Timer 1 limit */
#define ARC_AUX_INTR_VEC_BASE 0x25
/* Data cache related auxiliary registers */