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
20#define PPC_DBELL_MSG_BRDCAST	(0x04000000)
21#define PPC_DBELL_TYPE(x)	(((x) & 0xf) << (63-36))
22#define PPC_DBELL_TYPE_MASK	PPC_DBELL_TYPE(0xf)
23#define PPC_DBELL_LPID(x)	((x) << (63 - 49))
24#define PPC_DBELL_PIR_MASK	0x3fff
25enum ppc_dbell {
26	PPC_DBELL = 0,		/* doorbell */
27	PPC_DBELL_CRIT = 1,	/* critical doorbell */
28	PPC_G_DBELL = 2,	/* guest doorbell */
29	PPC_G_DBELL_CRIT = 3,	/* guest critical doorbell */
30	PPC_G_DBELL_MC = 4,	/* guest mcheck doorbell */
31	PPC_DBELL_SERVER = 5,	/* doorbell on server */
32};
33
34#ifdef CONFIG_PPC_BOOK3S
35
36#define PPC_DBELL_MSGTYPE		PPC_DBELL_SERVER
37#define SPRN_DOORBELL_CPUTAG		SPRN_TIR
38#define PPC_DBELL_TAG_MASK		0x7f
39
40static inline void _ppc_msgsnd(u32 msg)
41{
42	if (cpu_has_feature(CPU_FTR_HVMODE))
43		__asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg));
44	else
45		__asm__ __volatile__ (PPC_MSGSNDP(%0) : : "r" (msg));
46}
47
48#else /* CONFIG_PPC_BOOK3S */
49
50#define PPC_DBELL_MSGTYPE		PPC_DBELL
51#define SPRN_DOORBELL_CPUTAG		SPRN_PIR
52#define PPC_DBELL_TAG_MASK		0x3fff
53
54static inline void _ppc_msgsnd(u32 msg)
55{
56	__asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg));
57}
58
59#endif /* CONFIG_PPC_BOOK3S */
60
61extern void doorbell_cause_ipi(int cpu, unsigned long data);
62extern void doorbell_exception(struct pt_regs *regs);
63extern void doorbell_setup_this_cpu(void);
64
65static inline void ppc_msgsnd(enum ppc_dbell type, u32 flags, u32 tag)
66{
67	u32 msg = PPC_DBELL_TYPE(type) | (flags & PPC_DBELL_MSG_BRDCAST) |
68			(tag & 0x07ffffff);
69
70	_ppc_msgsnd(msg);
71}
72
73#endif /* _ASM_POWERPC_DBELL_H */
74