/* * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* 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; static u8 *mcr = NULL; void __init bcm947xx_time_init(void) { unsigned int hz; extifregs_t *eir; /* * 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) 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) { /* Enable the timer interrupt */ setup_irq(7, &bcm947xx_timer_irqaction); }