Commit cbd6a603 authored by Russell King's avatar Russell King

[ARM] Fix EBSA110 timer functions.

Unfortunately this broke in Deepak's merge.  Fix it.
parent 0cf97231
......@@ -11,6 +11,7 @@
*/
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <asm/hardware.h>
......@@ -174,7 +175,7 @@ static struct irqaction ebsa110_timer_irq = {
/*
* Set up timer interrupt.
*/
void __init ebsa110_time_init(void)
static void __init ebsa110_init_time(void)
{
/*
* Timer 1, mode 2, LSB/MSB
......
/*
* linux/include/asm-arm/arch-ebsa110/time.h
*
* Copyright (C) 1996,1997,1998 Russell King.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* No real time clock on the evalulation board!
*
* Changelog:
* 10-Oct-1996 RMK Created
* 04-Dec-1997 RMK Updated for new arch/arm/kernel/time.c
* 07-Aug-1998 RMK Updated for arch/arm/kernel/leds.c
* 28-Dec-1998 APH Made leds code optional
*/
#include <asm/leds.h>
#include <asm/io.h>
extern unsigned long (*gettimeoffset)(void);
#define PIT_CTRL (PIT_BASE + 0x0d)
#define PIT_T2 (PIT_BASE + 0x09)
#define PIT_T1 (PIT_BASE + 0x05)
#define PIT_T0 (PIT_BASE + 0x01)
/*
* This is the rate at which your MCLK signal toggles (in Hz)
* This was measured on a 10 digit frequency counter sampling
* over 1 second.
*/
#define MCLK 47894000
/*
* This is the rate at which the PIT timers get clocked
*/
#define CLKBY7 (MCLK / 7)
/*
* This is the counter value. We tick at 200Hz on this platform.
*/
#define COUNT ((CLKBY7 + (HZ / 2)) / HZ)
/*
* Get the time offset from the system PIT. Note that if we have missed an
* interrupt, then the PIT counter will roll over (ie, be negative).
* This actually works out to be convenient.
*/
static unsigned long ebsa110_gettimeoffset(void)
{
unsigned long offset, count;
__raw_writeb(0x40, PIT_CTRL);
count = __raw_readb(PIT_T1);
count |= __raw_readb(PIT_T1) << 8;
/*
* If count > COUNT, make the number negative.
*/
if (count > COUNT)
count |= 0xffff0000;
offset = COUNT;
offset -= count;
/*
* `offset' is in units of timer counts. Convert
* offset to units of microseconds.
*/
offset = offset * (1000000 / HZ) / COUNT;
return offset;
}
static irqreturn_t
timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
u32 count;
/* latch and read timer 1 */
__raw_writeb(0x40, PIT_CTRL);
count = __raw_readb(PIT_T1);
count |= __raw_readb(PIT_T1) << 8;
count += COUNT;
__raw_writeb(count & 0xff, PIT_T1);
__raw_writeb(count >> 8, PIT_T1);
do_leds();
do_timer(regs);
do_profile(regs);
return IRQ_HANDLED;
}
/*
* Set up timer interrupt.
*/
void __init time_init(void)
{
/*
* Timer 1, mode 2, LSB/MSB
*/
__raw_writeb(0x70, PIT_CTRL);
__raw_writeb(COUNT & 0xff, PIT_T1);
__raw_writeb(COUNT >> 8, PIT_T1);
gettimeoffset = ebsa110_gettimeoffset;
timer_irq.handler = timer_interrupt;
setup_irq(IRQ_EBSA110_TIMER0, &timer_irq);
}
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