tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Platform specific functions
3 *
4 * This file is subject to the terms and conditions of the GNU General
5 * Public License. See the file "COPYING" in the main directory of
6 * this archive for more details.
7 *
8 * Copyright (C) 2001 - 2005 Tensilica Inc.
9 */
10
11#ifndef _XTENSA_PLATFORM_H
12#define _XTENSA_PLATFORM_H
13
14#include <linux/types.h>
15#include <linux/pci.h>
16
17#include <asm/bootparam.h>
18
19/*
20 * platform_init is called before the mmu is initialized to give the
21 * platform a early hook-up. bp_tag_t is a list of configuration tags
22 * passed from the boot-loader.
23 */
24extern void platform_init(bp_tag_t*);
25
26/*
27 * platform_setup is called from setup_arch with a pointer to the command-line
28 * string.
29 */
30extern void platform_setup (char **);
31
32/*
33 * platform_restart is called to restart the system.
34 */
35extern void platform_restart (void);
36
37/*
38 * platform_halt is called to stop the system and halt.
39 */
40extern void platform_halt (void);
41
42/*
43 * platform_power_off is called to stop the system and power it off.
44 */
45extern void platform_power_off (void);
46
47/*
48 * platform_idle is called from the idle function.
49 */
50extern void platform_idle (void);
51
52/*
53 * platform_heartbeat is called every HZ
54 */
55extern void platform_heartbeat (void);
56
57/*
58 * platform_pcibios_init is called to allow the platform to setup the pci bus.
59 */
60extern void platform_pcibios_init (void);
61
62/*
63 * platform_pcibios_fixup allows to modify the PCI configuration.
64 */
65extern int platform_pcibios_fixup (void);
66
67/*
68 * platform_calibrate_ccount calibrates cpu clock freq (CONFIG_XTENSA_CALIBRATE)
69 */
70extern void platform_calibrate_ccount (void);
71
72/*
73 * Flush and reset the mmu, simulate a processor reset, and
74 * jump to the reset vector.
75 */
76void cpu_reset(void) __attribute__((noreturn));
77
78/*
79 * Memory caching is platform-dependent in noMMU xtensa configurations.
80 * The following set of functions should be implemented in platform code
81 * in order to enable coherent DMA memory operations when CONFIG_MMU is not
82 * enabled. Default implementations do nothing and issue a warning.
83 */
84
85/*
86 * Check whether p points to a cached memory.
87 */
88bool platform_vaddr_cached(const void *p);
89
90/*
91 * Check whether p points to an uncached memory.
92 */
93bool platform_vaddr_uncached(const void *p);
94
95/*
96 * Return pointer to an uncached view of the cached sddress p.
97 */
98void *platform_vaddr_to_uncached(void *p);
99
100/*
101 * Return pointer to a cached view of the uncached sddress p.
102 */
103void *platform_vaddr_to_cached(void *p);
104
105#endif /* _XTENSA_PLATFORM_H */