[linux-2.6-block.git] / arch / m68k / hp300 / time.c

/*
 *  linux/arch/m68k/hp300/time.c
 *
 *  Copyright (C) 1998 Philip Blundell <philb@gnu.org>
 *
 *  This file contains the HP300-specific time handling code.
 */

#include <asm/ptrace.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/kernel_stat.h>
#include <linux/interrupt.h>
#include <asm/machdep.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/traps.h>
#include <asm/blinken.h>

/* Clock hardware definitions */

#define CLOCKBASE	0xf05f8000

#define	CLKCR1		0x1
#define	CLKCR2		0x3
#define	CLKCR3		CLKCR1
#define	CLKSR		CLKCR2
#define	CLKMSB1		0x5
#define	CLKMSB2		0x9
#define	CLKMSB3		0xD

/* This is for machines which generate the exact clock. */
#define USECS_PER_JIFFY (1000000/HZ)

#define INTVAL ((10000 / 4) - 1)

static irqreturn_t hp300_tick(int irq, void *dev_id)
{
	unsigned long tmp;
	irq_handler_t vector = dev_id;
	in_8(CLOCKBASE + CLKSR);
	asm volatile ("movpw %1@(5),%0" : "=d" (tmp) : "a" (CLOCKBASE));
	/* Turn off the network and SCSI leds */
	blinken_leds(0, 0xe0);
	return vector(irq, NULL);
}

u32 hp300_gettimeoffset(void)
{
  /* Read current timer 1 value */
  unsigned char lsb, msb1, msb2;
  unsigned short ticks;

  msb1 = in_8(CLOCKBASE + 5);
  lsb = in_8(CLOCKBASE + 7);
  msb2 = in_8(CLOCKBASE + 5);
  if (msb1 != msb2)
    /* A carry happened while we were reading.  Read it again */
    lsb = in_8(CLOCKBASE + 7);
  ticks = INTVAL - ((msb2 << 8) | lsb);
  return ((USECS_PER_JIFFY * ticks) / INTVAL) * 1000;
}

void __init hp300_sched_init(irq_handler_t vector)
{
  out_8(CLOCKBASE + CLKCR2, 0x1);		/* select CR1 */
  out_8(CLOCKBASE + CLKCR1, 0x1);		/* reset */

  asm volatile(" movpw %0,%1@(5)" : : "d" (INTVAL), "a" (CLOCKBASE));

  if (request_irq(IRQ_AUTO_6, hp300_tick, 0, "timer tick", vector))
    pr_err("Couldn't register timer interrupt\n");

  out_8(CLOCKBASE + CLKCR2, 0x1);		/* select CR1 */
  out_8(CLOCKBASE + CLKCR1, 0x40);		/* enable irq */
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/arch/m68k/hp300/time.c
	3	*
	4	* Copyright (C) 1998 Philip Blundell <philb@gnu.org>
	5	*
	6	* This file contains the HP300-specific time handling code.
	7	*/
	8
	9	#include <asm/ptrace.h>
	10	#include <linux/types.h>
	11	#include <linux/init.h>
	12	#include <linux/sched.h>
	13	#include <linux/kernel_stat.h>
	14	#include <linux/interrupt.h>
	15	#include <asm/machdep.h>
	16	#include <asm/irq.h>
	17	#include <asm/io.h>
1da177e4 LT	18	#include <asm/traps.h>
1da177e4 LT	19	#include <asm/blinken.h>
1da177e4 LT	20
	21	/* Clock hardware definitions */
	22
	23	#define CLOCKBASE 0xf05f8000
	24
	25	#define CLKCR1 0x1
	26	#define CLKCR2 0x3
	27	#define CLKCR3 CLKCR1
	28	#define CLKSR CLKCR2
	29	#define CLKMSB1 0x5
	30	#define CLKMSB2 0x9
	31	#define CLKMSB3 0xD
	32
	33	/* This is for machines which generate the exact clock. */
	34	#define USECS_PER_JIFFY (1000000/HZ)
	35
	36	#define INTVAL ((10000 / 4) - 1)
	37
2850bc27	38	static irqreturn_t hp300_tick(int irq, void *dev_id)
1da177e4 LT	39	{
1da177e4 LT	40	unsigned long tmp;
40220c1a	41	irq_handler_t vector = dev_id;
1da177e4 LT	42	in_8(CLOCKBASE + CLKSR);
	43	asm volatile ("movpw %1@(5),%0" : "=d" (tmp) : "a" (CLOCKBASE));
	44	/* Turn off the network and SCSI leds */
	45	blinken_leds(0, 0xe0);
2850bc27	46	return vector(irq, NULL);
1da177e4 LT	47	}
1da177e4 LT	48
c8d5ba18	49	u32 hp300_gettimeoffset(void)
1da177e4 LT	50	{
	51	/* Read current timer 1 value */
	52	unsigned char lsb, msb1, msb2;
	53	unsigned short ticks;
	54
	55	msb1 = in_8(CLOCKBASE + 5);
	56	lsb = in_8(CLOCKBASE + 7);
	57	msb2 = in_8(CLOCKBASE + 5);
	58	if (msb1 != msb2)
	59	/* A carry happened while we were reading. Read it again */
	60	lsb = in_8(CLOCKBASE + 7);
	61	ticks = INTVAL - ((msb2 << 8) \| lsb);
c8d5ba18	62	return ((USECS_PER_JIFFY * ticks) / INTVAL) * 1000;
1da177e4 LT	63	}
1da177e4 LT	64
40220c1a	65	void __init hp300_sched_init(irq_handler_t vector)
1da177e4 LT	66	{
	67	out_8(CLOCKBASE + CLKCR2, 0x1); /* select CR1 */
	68	out_8(CLOCKBASE + CLKCR1, 0x1); /* reset */
	69
	70	asm volatile(" movpw %0,%1@(5)" : : "d" (INTVAL), "a" (CLOCKBASE));
	71
5a239453	72	if (request_irq(IRQ_AUTO_6, hp300_tick, 0, "timer tick", vector))
8bd3968b	73	pr_err("Couldn't register timer interrupt\n");
1da177e4 LT	74
	75	out_8(CLOCKBASE + CLKCR2, 0x1); /* select CR1 */
	76	out_8(CLOCKBASE + CLKCR1, 0x40); /* enable irq */
	77	}