arch/powerpc/include/asm/dbell.h

   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
  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 */