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
  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
  25 enum 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
  40 static 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
  54 static inline void _ppc_msgsnd(u32 msg)
  55 {
  56         __asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg));
  57 }
  58
  59 #endif /* CONFIG_PPC_BOOK3S */
  60
  61 extern void doorbell_cause_ipi(int cpu, unsigned long data);
  62 extern void doorbell_exception(struct pt_regs *regs);
  63 extern void doorbell_setup_this_cpu(void);
  64
  65 static 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 */