2 * Copyright 2004, 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.
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>
29 /* Global SB handle */
30 extern void *bcm947xx_sbh;
31 extern spinlock_t bcm947xx_sbh_lock;
34 #define sbh bcm947xx_sbh
35 #define sbh_lock bcm947xx_sbh_lock
37 extern int panic_timeout;
38 static int watchdog = 0;
39 static u8 *mcr = NULL;
42 bcm947xx_time_init(void)
48 * Use deterministic values for initial counter interrupt
49 * so that calibrate delay avoids encountering a counter wrap.
52 write_c0_compare(0xffff);
54 if (!(hz = sb_mips_clock(sbh)))
57 printk("CPU: BCM%04x rev %d at %d MHz\n", sb_chip(sbh), sb_chiprev(sbh),
58 (hz + 500000) / 1000000);
60 /* Set MIPS counter frequency for fixed_rate_gettimeoffset() */
61 mips_hpt_frequency = hz / 2;
63 /* Set watchdog interval in ms */
64 watchdog = simple_strtoul(nvram_safe_get("watchdog"), NULL, 0);
66 /* Please set the watchdog to 3 sec if it is less than 3 but not equal to 0 */
73 /* Set panic timeout in seconds */
74 panic_timeout = watchdog / 1000;
77 if ((eir = sb_setcore(sbh, SB_EXTIF, 0))) {
78 sbconfig_t *sb = (sbconfig_t *)((unsigned int) eir + SBCONFIGOFF);
79 unsigned long base = EXTIF_CFGIF_BASE(sb_base(readl(&sb->sbadmatch1)));
80 mcr = (u8 *) ioremap_nocache(base + UART_MCR, 1);
85 bcm947xx_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
87 /* Generic MIPS timer code */
88 timer_interrupt(irq, dev_id, regs);
90 /* Set the watchdog timer to reset after the specified number of ms */
92 sb_watchdog(sbh, WATCHDOG_CLOCK / 1000 * watchdog);
95 (*((int *)0xa0000f1c))++;
97 /* Blink one of the LEDs in the external UART */
98 if (mcr && !(jiffies % (HZ/2)))
99 writeb(readb(mcr) ^ UART_MCR_OUT2, mcr);
103 static struct irqaction bcm947xx_timer_irqaction = {
104 bcm947xx_timer_interrupt,
113 bcm947xx_timer_setup(struct irqaction *irq)
115 /* Enable the timer interrupt */
116 setup_irq(7, &bcm947xx_timer_irqaction);