2 * Copyright 2006, Broadcom Corporation
5 * THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
6 * KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
7 * SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
8 * FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
10 * $Id: time.c,v 1.1.1.10 2006/02/27 03:42:55 honor Exp $
12 #include <linux/config.h>
13 #include <linux/init.h>
14 #include <linux/kernel.h>
15 #include <linux/sched.h>
16 #include <linux/serial_reg.h>
17 #include <linux/interrupt.h>
18 #include <asm/addrspace.h>
33 /* Global SB handle */
34 extern void *bcm947xx_sbh;
35 extern spinlock_t bcm947xx_sbh_lock;
38 #define sbh bcm947xx_sbh
39 #define sbh_lock bcm947xx_sbh_lock
41 extern int panic_timeout;
42 static int watchdog = 0;
45 bcm947xx_time_init(void)
50 * Use deterministic values for initial counter interrupt
51 * so that calibrate delay avoids encountering a counter wrap.
54 write_c0_compare(0xffff);
56 if (!(hz = sb_cpu_clock(sbh)))
59 printk("CPU: BCM%04x rev %d at %d MHz\n", sb_chip(sbh), sb_chiprev(sbh),
60 (hz + 500000) / 1000000);
62 /* Set MIPS counter frequency for fixed_rate_gettimeoffset() */
63 mips_hpt_frequency = hz / 2;
65 /* Set watchdog interval in ms */
66 watchdog = simple_strtoul(nvram_safe_get("watchdog"), NULL, 0);
68 /* Please set the watchdog to 3 sec if it is less than 3 but not equal to 0 */
74 /* Set panic timeout in seconds */
75 panic_timeout = watchdog / 1000;
79 bcm947xx_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
81 /* Generic MIPS timer code */
82 timer_interrupt(irq, dev_id, regs);
84 /* Set the watchdog timer to reset after the specified number of ms */
86 if (sb_chip(sbh) == BCM5354_CHIP_ID)
87 sb_watchdog(sbh, WATCHDOG_CLOCK_5354 / 1000 * watchdog);
89 sb_watchdog(sbh, WATCHDOG_CLOCK / 1000 * watchdog);
94 static struct irqaction bcm947xx_timer_irqaction = {
95 bcm947xx_timer_interrupt,
104 bcm947xx_timer_setup(struct irqaction *irq)
108 /* Enable the timer interrupt */
109 setup_irq(7, &bcm947xx_timer_irqaction);
113 for (x=0; x<5; x++) {
116 while (ticks == jiffies)