fonera-mp3: fix json-c dependency here as well
[openwrt.git] / target / linux / brcm-2.4 / files / arch / mips / bcm947xx / time.c
1 /*
2 * Copyright 2006, Broadcom Corporation
3 * All Rights Reserved.
4 *
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.
9 *
10 * $Id: time.c,v 1.1.1.10 2006/02/27 03:42:55 honor Exp $
11 */
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>
19 #include <asm/io.h>
20 #include <asm/time.h>
21
22 #include <typedefs.h>
23 #include <osl.h>
24 #include <bcmnvram.h>
25 #include <sbconfig.h>
26 #include <sbextif.h>
27 #include <sbutils.h>
28 #include <hndmips.h>
29 #include <mipsinc.h>
30 #include <hndcpu.h>
31
32 /* Global SB handle */
33 extern void *bcm947xx_sbh;
34 extern spinlock_t bcm947xx_sbh_lock;
35
36 /* Convenience */
37 #define sbh bcm947xx_sbh
38 #define sbh_lock bcm947xx_sbh_lock
39
40 extern int panic_timeout;
41 static int watchdog = 0;
42 static u8 *mcr = NULL;
43
44 void __init
45 bcm947xx_time_init(void)
46 {
47 unsigned int hz;
48 extifregs_t *eir;
49
50 /*
51 * Use deterministic values for initial counter interrupt
52 * so that calibrate delay avoids encountering a counter wrap.
53 */
54 write_c0_count(0);
55 write_c0_compare(0xffff);
56
57 if (!(hz = sb_cpu_clock(sbh)))
58 hz = 100000000;
59
60 printk("CPU: BCM%04x rev %d at %d MHz\n", sb_chip(sbh), sb_chiprev(sbh),
61 (hz + 500000) / 1000000);
62
63 /* Set MIPS counter frequency for fixed_rate_gettimeoffset() */
64 mips_hpt_frequency = hz / 2;
65
66 /* Set watchdog interval in ms */
67 watchdog = simple_strtoul(nvram_safe_get("watchdog"), NULL, 0);
68
69 /* Please set the watchdog to 3 sec if it is less than 3 but not equal to 0 */
70 if (watchdog > 0) {
71 if (watchdog < 3000)
72 watchdog = 3000;
73 }
74
75 /* Set panic timeout in seconds */
76 panic_timeout = watchdog / 1000;
77 }
78
79 static void
80 bcm947xx_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
81 {
82 /* Generic MIPS timer code */
83 timer_interrupt(irq, dev_id, regs);
84
85 /* Set the watchdog timer to reset after the specified number of ms */
86 if (watchdog > 0)
87 sb_watchdog(sbh, WATCHDOG_CLOCK / 1000 * watchdog);
88 }
89
90 static struct irqaction bcm947xx_timer_irqaction = {
91 bcm947xx_timer_interrupt,
92 SA_INTERRUPT,
93 0,
94 "timer",
95 NULL,
96 NULL
97 };
98
99 void __init
100 bcm947xx_timer_setup(struct irqaction *irq)
101 {
102 int x;
103
104 /* Enable the timer interrupt */
105 setup_irq(7, &bcm947xx_timer_irqaction);
106
107 sti();
108
109 for (x=0; x<5; x++) {
110 unsigned long ticks;
111 ticks = jiffies;
112 while (ticks == jiffies)
113 /* do nothing */;
114 }
115 }
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