2 * linux/include/asm-arm/arch-nexuspci/time.h
4 * Copyright (c) 1997, 1998, 1999, 2000 FutureTV Labs Ltd.
6 * The FTV PCI card has no real-time clock. We get timer ticks from the
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
17 static void timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
19 static int count = 25;
20 unsigned char stat = __raw_readb(DUART_BASE + 0x14);
22 return; /* Not for us */
25 __raw_writeb(0x90, DUART_BASE + 8);
30 __raw_writeb(0x1a + state, INTCONT_BASE);
31 __raw_writeb(0x18 + state, INTCONT_BASE);
35 /* Wait for slow rise time */
36 __raw_readb(DUART_BASE + 0x14);
37 __raw_readb(DUART_BASE + 0x14);
38 __raw_readb(DUART_BASE + 0x14);
39 __raw_readb(DUART_BASE + 0x14);
40 __raw_readb(DUART_BASE + 0x14);
41 __raw_readb(DUART_BASE + 0x14);
46 static inline void setup_timer(void)
48 int tick = 3686400 / 16 / 2 / 100;
50 __raw_writeb(tick & 0xff, DUART_BASE + 0x1c);
51 __raw_writeb(tick >> 8, DUART_BASE + 0x18);
52 __raw_writeb(0x80, DUART_BASE + 8);
53 __raw_writeb(0x10, DUART_BASE + 0x14);
55 timer_irq.handler = timer_interrupt;
56 timer_irq.flags = SA_SHIRQ;
58 setup_arm_irq(IRQ_TIMER, &timer_irq);