thermal: fix Mediatek thermal controller build
[linux/fpc-iii.git] / arch / mips / kernel / csrc-ioasic.c
blob722f5589cd1dcdb1ec8440ca5fa93af219deb7ce
1 /*
2 * DEC I/O ASIC's counter clocksource
4 * Copyright (C) 2008 Yoichi Yuasa <yuasa@linux-mips.org>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 #include <linux/clocksource.h>
17 #include <linux/sched_clock.h>
18 #include <linux/init.h>
20 #include <asm/ds1287.h>
21 #include <asm/time.h>
22 #include <asm/dec/ioasic.h>
23 #include <asm/dec/ioasic_addrs.h>
25 static cycle_t dec_ioasic_hpt_read(struct clocksource *cs)
27 return ioasic_read(IO_REG_FCTR);
30 static struct clocksource clocksource_dec = {
31 .name = "dec-ioasic",
32 .read = dec_ioasic_hpt_read,
33 .mask = CLOCKSOURCE_MASK(32),
34 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
37 static u64 notrace dec_ioasic_read_sched_clock(void)
39 return ioasic_read(IO_REG_FCTR);
42 int __init dec_ioasic_clocksource_init(void)
44 unsigned int freq;
45 u32 start, end;
46 int i = HZ / 8;
48 ds1287_timer_state();
49 while (!ds1287_timer_state())
52 start = dec_ioasic_hpt_read(&clocksource_dec);
54 while (i--)
55 while (!ds1287_timer_state())
58 end = dec_ioasic_hpt_read(&clocksource_dec);
60 freq = (end - start) * 8;
62 /* An early revision of the I/O ASIC didn't have the counter. */
63 if (!freq)
64 return -ENXIO;
66 printk(KERN_INFO "I/O ASIC clock frequency %dHz\n", freq);
68 clocksource_dec.rating = 200 + freq / 10000000;
69 clocksource_register_hz(&clocksource_dec, freq);
71 sched_clock_register(dec_ioasic_read_sched_clock, 32, freq);
73 return 0;