2917947a67
This removes the hard-coded shift values for the MTU timer, since the different platforms using this has very different running frequencies doing this dynamically is a better idea. Also take this opportunity to make a more through shutdown of the MTU clockevent when requested. Acked-by: Alessandro Rubini <rubini@unipv.it> Signed-off-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
54 lines
1.6 KiB
C
54 lines
1.6 KiB
C
#ifndef __PLAT_MTU_H
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#define __PLAT_MTU_H
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/*
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* Guaranteed runtime conversion range in seconds for
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* the clocksource and clockevent.
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*/
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#define MTU_MIN_RANGE 4
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/* should be set by the platform code */
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extern void __iomem *mtu_base;
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/*
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* The MTU device hosts four different counters, with 4 set of
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* registers. These are register names.
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*/
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#define MTU_IMSC 0x00 /* Interrupt mask set/clear */
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#define MTU_RIS 0x04 /* Raw interrupt status */
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#define MTU_MIS 0x08 /* Masked interrupt status */
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#define MTU_ICR 0x0C /* Interrupt clear register */
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/* per-timer registers take 0..3 as argument */
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#define MTU_LR(x) (0x10 + 0x10 * (x) + 0x00) /* Load value */
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#define MTU_VAL(x) (0x10 + 0x10 * (x) + 0x04) /* Current value */
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#define MTU_CR(x) (0x10 + 0x10 * (x) + 0x08) /* Control reg */
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#define MTU_BGLR(x) (0x10 + 0x10 * (x) + 0x0c) /* At next overflow */
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/* bits for the control register */
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#define MTU_CRn_ENA 0x80
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#define MTU_CRn_PERIODIC 0x40 /* if 0 = free-running */
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#define MTU_CRn_PRESCALE_MASK 0x0c
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#define MTU_CRn_PRESCALE_1 0x00
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#define MTU_CRn_PRESCALE_16 0x04
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#define MTU_CRn_PRESCALE_256 0x08
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#define MTU_CRn_32BITS 0x02
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#define MTU_CRn_ONESHOT 0x01 /* if 0 = wraps reloading from BGLR*/
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/* Other registers are usual amba/primecell registers, currently not used */
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#define MTU_ITCR 0xff0
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#define MTU_ITOP 0xff4
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#define MTU_PERIPH_ID0 0xfe0
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#define MTU_PERIPH_ID1 0xfe4
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#define MTU_PERIPH_ID2 0xfe8
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#define MTU_PERIPH_ID3 0xfeC
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#define MTU_PCELL0 0xff0
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#define MTU_PCELL1 0xff4
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#define MTU_PCELL2 0xff8
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#define MTU_PCELL3 0xffC
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#endif /* __PLAT_MTU_H */
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