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 #define _F(r,f,a,b)                                                     \
  21         r __platform_##f a b;                                           \
  22         r platform_##f a __attribute__((weak, alias("__platform_"#f)))
  23
  24 /*
  25  * Default functions that are used if no platform specific function is defined.
  26  * (Please, refer to include/asm-xtensa/platform.h for more information)
  27  */
  28
  29 _F(void, init, (bp_tag_t *first), { });
  30 _F(void, setup, (char** cmd), { });
  31 _F(void, restart, (void), { while(1); });
  32 _F(void, halt, (void), { while(1); });
  33 _F(void, power_off, (void), { while(1); });
  34 _F(void, idle, (void), { __asm__ __volatile__ ("waiti 0" ::: "memory"); });
  35 _F(void, heartbeat, (void), { });
  36
  37 #ifdef CONFIG_XTENSA_CALIBRATE_CCOUNT
  38 _F(void, calibrate_ccount, (void),
  39 {
  40         pr_err("ERROR: Cannot calibrate cpu frequency! Assuming 10MHz.\n");
  41         ccount_freq = 10 * 1000000UL;
  42 });
  43 #endif