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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);

}