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/*
* linux/include/asm-arm/arch-nexuspci/time.h
*
* Copyright (c) 1997 Phil Blundell.
*
* Nexus PCI card has no real-time clock. We get timer ticks from the
* SCC chip.
*/
#define UART_BASE 0xfff00000
#define INTCONT 0xffe00000
#define update_rtc()
extern __inline__ unsigned long gettimeoffset (void)
{
return 0;
}
static void timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
static int count = 50;
writeb(0x90, UART_BASE + 8);
if (--count == 0) {
static int state = 1;
state ^= 1;
writeb(0x1a + state, INTCONT);
count = 50;
}
readb(UART_BASE + 0x14);
readb(UART_BASE + 0x14);
readb(UART_BASE + 0x14);
readb(UART_BASE + 0x14);
readb(UART_BASE + 0x14);
readb(UART_BASE + 0x14);
do_timer(regs);
}
static struct irqaction timerirq = {
timer_interrupt,
0,
0,
"timer",
NULL,
NULL
};
extern __inline__ void setup_timer(void)
{
int tick = 3686400 / 16 / 2 / 100;
writeb(tick & 0xff, UART_BASE + 0x1c);
writeb(tick >> 8, UART_BASE + 0x18);
writeb(0x80, UART_BASE + 8);
writeb(0x10, UART_BASE + 0x14);
/*
* Default the date to 1 Jan 1970 0:0:0
* You will have to run a time daemon to set the
* clock correctly at bootup
*/
xtime.tv_sec = mktime(1970, 1, 1, 0, 0, 0);
setup_arm_irq(IRQ_TIMER, &timerirq);
}
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