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Diffstat (limited to 'kernel/arch/mn10300/unit-asb2303/include/unit/timex.h')
| -rw-r--r-- | kernel/arch/mn10300/unit-asb2303/include/unit/timex.h | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/kernel/arch/mn10300/unit-asb2303/include/unit/timex.h b/kernel/arch/mn10300/unit-asb2303/include/unit/timex.h new file mode 100644 index 000000000..c37f9832c --- /dev/null +++ b/kernel/arch/mn10300/unit-asb2303/include/unit/timex.h @@ -0,0 +1,146 @@ +/* ASB2303-specific timer specifications + * + * Copyright (C) 2007, 2010 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public Licence + * as published by the Free Software Foundation; either version + * 2 of the Licence, or (at your option) any later version. + */ +#ifndef _ASM_UNIT_TIMEX_H +#define _ASM_UNIT_TIMEX_H + +#include <asm/timer-regs.h> +#include <unit/clock.h> +#include <asm/param.h> + +/* + * jiffies counter specifications + */ + +#define TMJCBR_MAX 0xffff +#define TMJCIRQ TM1IRQ +#define TMJCICR TM1ICR + +#ifndef __ASSEMBLY__ + +#define MN10300_SRC_IOCLK MN10300_IOCLK + +#ifndef HZ +# error HZ undeclared. +#endif /* !HZ */ +/* use as little prescaling as possible to avoid losing accuracy */ +#if (MN10300_SRC_IOCLK + HZ / 2) / HZ - 1 <= TMJCBR_MAX +# define IOCLK_PRESCALE 1 +# define JC_TIMER_CLKSRC TM0MD_SRC_IOCLK +# define TSC_TIMER_CLKSRC TM4MD_SRC_IOCLK +#elif (MN10300_SRC_IOCLK / 8 + HZ / 2) / HZ - 1 <= TMJCBR_MAX +# define IOCLK_PRESCALE 8 +# define JC_TIMER_CLKSRC TM0MD_SRC_IOCLK_8 +# define TSC_TIMER_CLKSRC TM4MD_SRC_IOCLK_8 +#elif (MN10300_SRC_IOCLK / 32 + HZ / 2) / HZ - 1 <= TMJCBR_MAX +# define IOCLK_PRESCALE 32 +# define JC_TIMER_CLKSRC TM0MD_SRC_IOCLK_32 +# define TSC_TIMER_CLKSRC TM4MD_SRC_IOCLK_32 +#else +# error You lose. +#endif + +#define MN10300_JCCLK (MN10300_SRC_IOCLK / IOCLK_PRESCALE) +#define MN10300_TSCCLK (MN10300_SRC_IOCLK / IOCLK_PRESCALE) + +#define MN10300_JC_PER_HZ ((MN10300_JCCLK + HZ / 2) / HZ) +#define MN10300_TSC_PER_HZ ((MN10300_TSCCLK + HZ / 2) / HZ) + +static inline void stop_jiffies_counter(void) +{ + u16 tmp; + TM01MD = JC_TIMER_CLKSRC | TM1MD_SRC_TM0CASCADE << 8; + tmp = TM01MD; +} + +static inline void reload_jiffies_counter(u32 cnt) +{ + u32 tmp; + + TM01BR = cnt; + tmp = TM01BR; + + TM01MD = JC_TIMER_CLKSRC | \ + TM1MD_SRC_TM0CASCADE << 8 | \ + TM0MD_INIT_COUNTER | \ + TM1MD_INIT_COUNTER << 8; + + + TM01MD = JC_TIMER_CLKSRC | \ + TM1MD_SRC_TM0CASCADE << 8 | \ + TM0MD_COUNT_ENABLE | \ + TM1MD_COUNT_ENABLE << 8; + + tmp = TM01MD; +} + +#endif /* !__ASSEMBLY__ */ + + +/* + * timestamp counter specifications + */ + +#define TMTSCBR_MAX 0xffffffff +#define TMTSCBC TM45BC + +#ifndef __ASSEMBLY__ + +static inline void startup_timestamp_counter(void) +{ + u32 t32; + + /* set up timer 4 & 5 cascaded as a 32-bit counter to count real time + * - count down from 4Gig-1 to 0 and wrap at IOCLK rate + */ + TM45BR = TMTSCBR_MAX; + t32 = TM45BR; + + TM4MD = TSC_TIMER_CLKSRC; + TM4MD |= TM4MD_INIT_COUNTER; + TM4MD &= ~TM4MD_INIT_COUNTER; + TM4ICR = 0; + t32 = TM4ICR; + + TM5MD = TM5MD_SRC_TM4CASCADE; + TM5MD |= TM5MD_INIT_COUNTER; + TM5MD &= ~TM5MD_INIT_COUNTER; + TM5ICR = 0; + t32 = TM5ICR; + + TM5MD |= TM5MD_COUNT_ENABLE; + TM4MD |= TM4MD_COUNT_ENABLE; + t32 = TM5MD; + t32 = TM4MD; +} + +static inline void shutdown_timestamp_counter(void) +{ + u8 t8; + TM4MD = 0; + TM5MD = 0; + t8 = TM4MD; + t8 = TM5MD; +} + +/* + * we use a cascaded pair of 16-bit down-counting timers to count I/O + * clock cycles for the purposes of time keeping + */ +typedef unsigned long cycles_t; + +static inline cycles_t read_timestamp_counter(void) +{ + return (cycles_t)~TMTSCBC; +} + +#endif /* !__ASSEMBLY__ */ + +#endif /* _ASM_UNIT_TIMEX_H */ |