Linux Kernel  3.7.1
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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 <[email protected]>
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