platform.c

 1/*
 2 * arch/xtensa/kernel/platform.c
 3 *
 4 * Default platform functions.
 5 *
 6 * This file is subject to the terms and conditions of the GNU General Public
 7 * License.  See the file "COPYING" in the main directory of this archive
 8 * for more details.
 9 *
10 * Copyright (C) 2005 Tensilica Inc.
11 *
12 * Chris Zankel <chris@zankel.net>
13 */
14
15#include <linux/printk.h>
16#include <linux/types.h>
17#include <linux/units.h>
18#include <asm/platform.h>
19#include <asm/timex.h>
20
21/*
22 * Default functions that are used if no platform specific function is defined.
23 * (Please, refer to arch/xtensa/include/asm/platform.h for more information)
24 */
25
26void __weak __init platform_init(bp_tag_t *first)
27{
28}
29
30void __weak __init platform_setup(char **cmd)
31{
32}
33
34void __weak platform_idle(void)
35{
36	__asm__ __volatile__ ("waiti 0" ::: "memory");
37}
38
39#ifdef CONFIG_XTENSA_CALIBRATE_CCOUNT
40void __weak platform_calibrate_ccount(void)
41{
42	pr_err("ERROR: Cannot calibrate cpu frequency! Assuming 10 MHz.\n");
43	ccount_freq = 10 * HZ_PER_MHZ;
44}
45#endif