diff options
author | Ingo Molnar <mingo@elte.hu> | 2009-06-07 12:22:15 +0200 |
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committer | Ingo Molnar <mingo@elte.hu> | 2009-06-07 12:22:15 +0200 |
commit | 5f4457a4f62cc9d78e04c0eb12ff0540899aad89 (patch) | |
tree | 0b973d527ea6b2ae31e08da0746b4965a3c5a6d8 /arch/mn10300/unit-asb2303/include/unit/timex.h | |
parent | 9b94b3a19b13e094c10f65f24bc358f6ffe4eacd (diff) | |
parent | b87297fb405ef13cac375f202d114323b076a56d (diff) |
Merge branch 'linus' into x86/cpu
Diffstat (limited to 'arch/mn10300/unit-asb2303/include/unit/timex.h')
-rw-r--r-- | arch/mn10300/unit-asb2303/include/unit/timex.h | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/arch/mn10300/unit-asb2303/include/unit/timex.h b/arch/mn10300/unit-asb2303/include/unit/timex.h new file mode 100644 index 00000000000..f206b63c95b --- /dev/null +++ b/arch/mn10300/unit-asb2303/include/unit/timex.h @@ -0,0 +1,135 @@ +/* ASB2303-specific timer specifcations + * + * Copyright (C) 2007 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 + +#ifndef __ASSEMBLY__ +#include <linux/irq.h> +#endif /* __ASSEMBLY__ */ + +#include <asm/timer-regs.h> +#include <unit/clock.h> + +/* + * jiffies counter specifications + */ + +#define TMJCBR_MAX 0xffff +#define TMJCBC TM01BC + +#define TMJCMD TM01MD +#define TMJCBR TM01BR +#define TMJCIRQ TM1IRQ +#define TMJCICR TM1ICR +#define TMJCICR_LEVEL GxICR_LEVEL_5 + +#ifndef __ASSEMBLY__ + +static inline void startup_jiffies_counter(void) +{ + unsigned rate; + u16 md, t16; + + /* use as little prescaling as possible to avoid losing accuracy */ + md = TM0MD_SRC_IOCLK; + rate = MN10300_JCCLK / HZ; + + if (rate > TMJCBR_MAX) { + md = TM0MD_SRC_IOCLK_8; + rate = MN10300_JCCLK / 8 / HZ; + + if (rate > TMJCBR_MAX) { + md = TM0MD_SRC_IOCLK_32; + rate = MN10300_JCCLK / 32 / HZ; + + if (rate > TMJCBR_MAX) + BUG(); + } + } + + TMJCBR = rate - 1; + t16 = TMJCBR; + + TMJCMD = + md | + TM1MD_SRC_TM0CASCADE << 8 | + TM0MD_INIT_COUNTER | + TM1MD_INIT_COUNTER << 8; + + TMJCMD = + md | + TM1MD_SRC_TM0CASCADE << 8 | + TM0MD_COUNT_ENABLE | + TM1MD_COUNT_ENABLE << 8; + + t16 = TMJCMD; + + TMJCICR |= GxICR_ENABLE | GxICR_DETECT | GxICR_REQUEST; + t16 = TMJCICR; +} + +static inline void shutdown_jiffies_counter(void) +{ +} + +#endif /* !__ASSEMBLY__ */ + + +/* + * timestamp counter specifications + */ + +#define TMTSCBR_MAX 0xffffffff +#define TMTSCBC TM45BC + +#ifndef __ASSEMBLY__ + +static inline void startup_timestamp_counter(void) +{ + /* 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; + + TM4MD = TM4MD_SRC_IOCLK; + TM4MD |= TM4MD_INIT_COUNTER; + TM4MD &= ~TM4MD_INIT_COUNTER; + TM4ICR = 0; + + TM5MD = TM5MD_SRC_TM4CASCADE; + TM5MD |= TM5MD_INIT_COUNTER; + TM5MD &= ~TM5MD_INIT_COUNTER; + TM5ICR = 0; + + TM5MD |= TM5MD_COUNT_ENABLE; + TM4MD |= TM4MD_COUNT_ENABLE; +} + +static inline void shutdown_timestamp_counter(void) +{ + TM4MD = 0; + TM5MD = 0; +} + +/* + * 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 */ |