tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1/*
2 * Copyright 2009 Freescale Semiconductor, Inc.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * provides masks and opcode images for use by code generation, emulation
10 * and for instructions that older assemblers might not know about
11 */
12#ifndef _ASM_POWERPC_DBELL_H
13#define _ASM_POWERPC_DBELL_H
14
15#include <linux/smp.h>
16#include <linux/threads.h>
17
18#include <asm/ppc-opcode.h>
19#include <asm/cpu_has_feature.h>
20
21#define PPC_DBELL_MSG_BRDCAST (0x04000000)
22#define PPC_DBELL_TYPE(x) (((x) & 0xf) << (63-36))
23#define PPC_DBELL_TYPE_MASK PPC_DBELL_TYPE(0xf)
24#define PPC_DBELL_LPID(x) ((x) << (63 - 49))
25#define PPC_DBELL_PIR_MASK 0x3fff
26enum ppc_dbell {
27 PPC_DBELL = 0, /* doorbell */
28 PPC_DBELL_CRIT = 1, /* critical doorbell */
29 PPC_G_DBELL = 2, /* guest doorbell */
30 PPC_G_DBELL_CRIT = 3, /* guest critical doorbell */
31 PPC_G_DBELL_MC = 4, /* guest mcheck doorbell */
32 PPC_DBELL_SERVER = 5, /* doorbell on server */
33};
34
35#ifdef CONFIG_PPC_BOOK3S
36
37#define PPC_DBELL_MSGTYPE PPC_DBELL_SERVER
38
39static inline void _ppc_msgsnd(u32 msg)
40{
41 __asm__ __volatile__ (ASM_FTR_IFSET(PPC_MSGSND(%1), PPC_MSGSNDP(%1), %0)
42 : : "i" (CPU_FTR_HVMODE), "r" (msg));
43}
44
45/* sync before sending message */
46static inline void ppc_msgsnd_sync(void)
47{
48 __asm__ __volatile__ ("sync" : : : "memory");
49}
50
51/* sync after taking message interrupt */
52static inline void ppc_msgsync(void)
53{
54 /* sync is not required when taking messages from the same core */
55 __asm__ __volatile__ (ASM_FTR_IFSET(PPC_MSGSYNC " ; lwsync", "", %0)
56 : : "i" (CPU_FTR_HVMODE|CPU_FTR_ARCH_300));
57}
58
59static inline void _ppc_msgclr(u32 msg)
60{
61 __asm__ __volatile__ (ASM_FTR_IFSET(PPC_MSGCLR(%1), PPC_MSGCLRP(%1), %0)
62 : : "i" (CPU_FTR_HVMODE), "r" (msg));
63}
64
65static inline void ppc_msgclr(enum ppc_dbell type)
66{
67 u32 msg = PPC_DBELL_TYPE(type);
68
69 _ppc_msgclr(msg);
70}
71
72#else /* CONFIG_PPC_BOOK3S */
73
74#define PPC_DBELL_MSGTYPE PPC_DBELL
75
76static inline void _ppc_msgsnd(u32 msg)
77{
78 __asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg));
79}
80
81/* sync before sending message */
82static inline void ppc_msgsnd_sync(void)
83{
84 __asm__ __volatile__ ("sync" : : : "memory");
85}
86
87/* sync after taking message interrupt */
88static inline void ppc_msgsync(void)
89{
90}
91
92#endif /* CONFIG_PPC_BOOK3S */
93
94extern void doorbell_global_ipi(int cpu);
95extern void doorbell_core_ipi(int cpu);
96extern int doorbell_try_core_ipi(int cpu);
97extern void doorbell_exception(struct pt_regs *regs);
98
99static inline void ppc_msgsnd(enum ppc_dbell type, u32 flags, u32 tag)
100{
101 u32 msg = PPC_DBELL_TYPE(type) | (flags & PPC_DBELL_MSG_BRDCAST) |
102 (tag & 0x07ffffff);
103
104 _ppc_msgsnd(msg);
105}
106
107#endif /* _ASM_POWERPC_DBELL_H */