147 lines
3.2 KiB
C
147 lines
3.2 KiB
C
|
/* ASB2305-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 */
|