9a8fd55899
The attached patches provides part 6 of an architecture implementation for the Tensilica Xtensa CPU series. Signed-off-by: Chris Zankel <chris@zankel.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
94 lines
2.4 KiB
C
94 lines
2.4 KiB
C
/*
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* include/asm-xtensa/timex.h
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2001 - 2005 Tensilica Inc.
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*/
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#ifndef _XTENSA_TIMEX_H
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#define _XTENSA_TIMEX_H
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#ifdef __KERNEL__
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#include <asm/processor.h>
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#include <linux/stringify.h>
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#if XCHAL_INT_LEVEL(XCHAL_TIMER0_INTERRUPT) == 1
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# define LINUX_TIMER 0
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#elif XCHAL_INT_LEVEL(XCHAL_TIMER1_INTERRUPT) == 1
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# define LINUX_TIMER 1
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#elif XCHAL_INT_LEVEL(XCHAL_TIMER2_INTERRUPT) == 1
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# define LINUX_TIMER 2
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#else
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# error "Bad timer number for Linux configurations!"
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#endif
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#define LINUX_TIMER_INT XCHAL_TIMER_INTERRUPT(LINUX_TIMER)
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#define LINUX_TIMER_MASK (1L << LINUX_TIMER_INT)
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#define CLOCK_TICK_RATE 1193180 /* (everyone is using this value) */
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#define CLOCK_TICK_FACTOR 20 /* Factor of both 10^6 and CLOCK_TICK_RATE */
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#define FINETUNE ((((((long)LATCH * HZ - CLOCK_TICK_RATE) << SHIFT_HZ) * \
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(1000000/CLOCK_TICK_FACTOR) / (CLOCK_TICK_RATE/CLOCK_TICK_FACTOR)) \
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<< (SHIFT_SCALE-SHIFT_HZ)) / HZ)
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#ifdef CONFIG_XTENSA_CALIBRATE_CCOUNT
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extern unsigned long ccount_per_jiffy;
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extern unsigned long ccount_nsec;
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#define CCOUNT_PER_JIFFY ccount_per_jiffy
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#define CCOUNT_NSEC ccount_nsec
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#else
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#define CCOUNT_PER_JIFFY (CONFIG_XTENSA_CPU_CLOCK*(1000000UL/HZ))
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#define CCOUNT_NSEC (1000000000UL / CONFIG_XTENSA_CPU_CLOCK)
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#endif
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typedef unsigned long long cycles_t;
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/*
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* Only used for SMP.
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*/
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extern cycles_t cacheflush_time;
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#define get_cycles() (0)
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/*
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* Register access.
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*/
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#define WSR_CCOUNT(r) __asm__("wsr %0,"__stringify(CCOUNT) :: "a" (r))
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#define RSR_CCOUNT(r) __asm__("rsr %0,"__stringify(CCOUNT) : "=a" (r))
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#define WSR_CCOMPARE(x,r) __asm__("wsr %0,"__stringify(CCOMPARE_0)"+"__stringify(x) :: "a"(r))
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#define RSR_CCOMPARE(x,r) __asm__("rsr %0,"__stringify(CCOMPARE_0)"+"__stringify(x) : "=a"(r))
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static inline unsigned long get_ccount (void)
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{
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unsigned long ccount;
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RSR_CCOUNT(ccount);
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return ccount;
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}
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static inline void set_ccount (unsigned long ccount)
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{
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WSR_CCOUNT(ccount);
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}
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static inline unsigned long get_linux_timer (void)
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{
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unsigned ccompare;
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RSR_CCOMPARE(LINUX_TIMER, ccompare);
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return ccompare;
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}
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static inline void set_linux_timer (unsigned long ccompare)
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{
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WSR_CCOMPARE(LINUX_TIMER, ccompare);
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}
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#endif /* __KERNEL__ */
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#endif /* _XTENSA_TIMEX_H */
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