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Linux/arch/xtensa/kernel/platform.c

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  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/types.h>
 16 #include <linux/pci.h>
 17 #include <linux/time.h>
 18 #include <asm/platform.h>
 19 #include <asm/timex.h>
 20 #include <asm/param.h>          /* HZ */
 21 
 22 #define _F(r,f,a,b)                                                     \
 23         r __platform_##f a b;                                           \
 24         r platform_##f a __attribute__((weak, alias("__platform_"#f)))
 25 
 26 /*
 27  * Default functions that are used if no platform specific function is defined.
 28  * (Please, refer to include/asm-xtensa/platform.h for more information)
 29  */
 30 
 31 _F(void, setup, (char** cmd), { });
 32 _F(void, init_irq, (void), { });
 33 _F(void, restart, (void), { while(1); });
 34 _F(void, halt, (void), { while(1); });
 35 _F(void, power_off, (void), { while(1); });
 36 _F(void, idle, (void), { __asm__ __volatile__ ("waiti 0" ::: "memory"); });
 37 _F(void, heartbeat, (void), { });
 38 _F(int,  pcibios_fixup, (void), { return 0; });
 39 
 40 #ifdef CONFIG_XTENSA_CALIBRATE_CCOUNT
 41 _F(void, calibrate_ccount, (void),
 42 {
 43         pr_err("ERROR: Cannot calibrate cpu frequency! Assuming 10MHz.\n");
 44         ccount_per_jiffy = 10 * (1000000UL/HZ);
 45 });
 46 #endif
 47 

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