LXR linux/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
  44