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/*
* linux/include/asm-arm/arch-nexuspci/time.h
*
* Copyright (c) 1997, 1998, 1999, 2000 FutureTV Labs Ltd.
*
* The FTV PCI card has no real-time clock. We get timer ticks from the
* SCC chip.
*/
/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
static void timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
static int count = 25;
unsigned char stat = __raw_readb(DUART_BASE + 0x14);
if (!(stat & 0x10))
return; /* Not for us */
/* Reset counter */
__raw_writeb(0x90, DUART_BASE + 8);
if (--count == 0) {
static int state = 1;
state ^= 1;
__raw_writeb(0x1a + state, INTCONT_BASE);
__raw_writeb(0x18 + state, INTCONT_BASE);
count = 50;
}
/* Wait for slow rise time */
__raw_readb(DUART_BASE + 0x14);
__raw_readb(DUART_BASE + 0x14);
__raw_readb(DUART_BASE + 0x14);
__raw_readb(DUART_BASE + 0x14);
__raw_readb(DUART_BASE + 0x14);
__raw_readb(DUART_BASE + 0x14);
do_timer(regs);
}
static inline void setup_timer(void)
{
int tick = 3686400 / 16 / 2 / 100;
__raw_writeb(tick & 0xff, DUART_BASE + 0x1c);
__raw_writeb(tick >> 8, DUART_BASE + 0x18);
__raw_writeb(0x80, DUART_BASE + 8);
__raw_writeb(0x10, DUART_BASE + 0x14);
timer_irq.handler = timer_interrupt;
timer_irq.flags = SA_SHIRQ;
setup_arm_irq(IRQ_TIMER, &timer_irq);
}
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