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Linux/arch/powerpc/include/asm/dbell.h

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  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/feature-fixups.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
 26 enum 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 
 39 static 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 */
 46 static inline void ppc_msgsnd_sync(void)
 47 {
 48         __asm__ __volatile__ ("sync" : : : "memory");
 49 }
 50 
 51 /* sync after taking message interrupt */
 52 static 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 
 59 static 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 
 65 static 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 
 76 static inline void _ppc_msgsnd(u32 msg)
 77 {
 78         __asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg));
 79 }
 80 
 81 /* sync before sending message */
 82 static inline void ppc_msgsnd_sync(void)
 83 {
 84         __asm__ __volatile__ ("sync" : : : "memory");
 85 }
 86 
 87 /* sync after taking message interrupt */
 88 static inline void ppc_msgsync(void)
 89 {
 90 }
 91 
 92 #endif /* CONFIG_PPC_BOOK3S */
 93 
 94 extern void doorbell_global_ipi(int cpu);
 95 extern void doorbell_core_ipi(int cpu);
 96 extern int doorbell_try_core_ipi(int cpu);
 97 extern void doorbell_exception(struct pt_regs *regs);
 98 
 99 static 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 */
108 

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