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/*
* Copyright 2006, Broadcom Corporation
* All Rights Reserved.
*
* THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
* KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
* SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
*
* $Id: time.c,v 1.1.1.10 2006/02/27 03:42:55 honor Exp $
*/
#include <linux/config.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/serial_reg.h>
#include <linux/interrupt.h>
#include <asm/addrspace.h>
#include <asm/io.h>
#include <asm/time.h>
#include <typedefs.h>
#include <osl.h>
#include <bcmnvram.h>
#include <sbconfig.h>
#include <sbutils.h>
#include <sbchipc.h>
#include <hndmips.h>
#include <mipsinc.h>
#include <hndcpu.h>
#include <bcmdevs.h>
/* Global SB handle */
extern void *bcm947xx_sbh;
extern spinlock_t bcm947xx_sbh_lock;
/* Convenience */
#define sbh bcm947xx_sbh
#define sbh_lock bcm947xx_sbh_lock
extern int panic_timeout;
static int watchdog = 0;
void __init
bcm947xx_time_init(void)
{
unsigned int hz;
/*
* Use deterministic values for initial counter interrupt
* so that calibrate delay avoids encountering a counter wrap.
*/
write_c0_count(0);
write_c0_compare(0xffff);
if (!(hz = sb_cpu_clock(sbh)))
hz = 100000000;
printk("CPU: BCM%04x rev %d at %d MHz\n", sb_chip(sbh), sb_chiprev(sbh),
(hz + 500000) / 1000000);
/* Set MIPS counter frequency for fixed_rate_gettimeoffset() */
mips_hpt_frequency = hz / 2;
/* Set watchdog interval in ms */
watchdog = simple_strtoul(nvram_safe_get("watchdog"), NULL, 0);
/* Please set the watchdog to 3 sec if it is less than 3 but not equal to 0 */
if (watchdog > 0) {
if (watchdog < 3000)
watchdog = 3000;
}
/* Set panic timeout in seconds */
panic_timeout = watchdog / 1000;
}
static void
bcm947xx_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
/* Generic MIPS timer code */
timer_interrupt(irq, dev_id, regs);
/* Set the watchdog timer to reset after the specified number of ms */
if (watchdog > 0) {
if (sb_chip(sbh) == BCM5354_CHIP_ID)
sb_watchdog(sbh, WATCHDOG_CLOCK_5354 / 1000 * watchdog);
else
sb_watchdog(sbh, WATCHDOG_CLOCK / 1000 * watchdog);
}
}
static struct irqaction bcm947xx_timer_irqaction = {
bcm947xx_timer_interrupt,
SA_INTERRUPT,
0,
"timer",
NULL,
NULL
};
void __init
bcm947xx_timer_setup(struct irqaction *irq)
{
int x;
/* Enable the timer interrupt */
setup_irq(7, &bcm947xx_timer_irqaction);
sti();
for (x=0; x<5; x++) {
unsigned long ticks;
ticks = jiffies;
while (ticks == jiffies)
/* do nothing */;
}
}
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