arch/xtensa/kernel/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 <asm/platform.h>
  18 #include <asm/timex.h>
  19
  20 /*
  21  * Default functions that are used if no platform specific function is defined.
  22  * (Please, refer to arch/xtensa/include/asm/platform.h for more information)
  23  */
  24
  25 void __weak __init platform_init(bp_tag_t *first)
  26 {
  27 }
  28
  29 void __weak __init platform_setup(char **cmd)
  30 {
  31 }
  32
  33 void __weak platform_idle(void)
  34 {
  35         __asm__ __volatile__ ("waiti 0" ::: "memory");
  36 }
  37
  38 #ifdef CONFIG_XTENSA_CALIBRATE_CCOUNT
  39 void __weak platform_calibrate_ccount(void)
  40 {
  41         pr_err("ERROR: Cannot calibrate cpu frequency! Assuming 10MHz.\n");
  42         ccount_freq = 10 * 1000000UL;
  43 }
  44 #endif