You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
135 lines
2.6 KiB
135 lines
2.6 KiB
/* 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 <asm/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 */
|
|
|