arch/powerpc/include/asm/dbell.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * Copyright 2009 Freescale Semiconductor, Inc.
   4  *
   5  * provides masks and opcode images for use by code generation, emulation
   6  * and for instructions that older assemblers might not know about
   7  */
   8 #ifndef _ASM_POWERPC_DBELL_H
   9 #define _ASM_POWERPC_DBELL_H
  10
  11 #include <linux/smp.h>
  12 #include <linux/threads.h>
  13
  14 #include <asm/ppc-opcode.h>
  15 #include <asm/feature-fixups.h>
  16
  17 #define PPC_DBELL_MSG_BRDCAST   (0x04000000)
  18 #define PPC_DBELL_TYPE(x)       (((x) & 0xf) << (63-36))
  19 #define PPC_DBELL_TYPE_MASK     PPC_DBELL_TYPE(0xf)
  20 #define PPC_DBELL_LPID(x)       ((x) << (63 - 49))
  21 #define PPC_DBELL_PIR_MASK      0x3fff
  22 enum ppc_dbell {
  23         PPC_DBELL = 0,          /* doorbell */
  24         PPC_DBELL_CRIT = 1,     /* critical doorbell */
  25         PPC_G_DBELL = 2,        /* guest doorbell */
  26         PPC_G_DBELL_CRIT = 3,   /* guest critical doorbell */
  27         PPC_G_DBELL_MC = 4,     /* guest mcheck doorbell */
  28         PPC_DBELL_SERVER = 5,   /* doorbell on server */
  29 };
  30
  31 #ifdef CONFIG_PPC_BOOK3S
  32
  33 #define PPC_DBELL_MSGTYPE               PPC_DBELL_SERVER
  34
  35 static inline void _ppc_msgsnd(u32 msg)
  36 {
  37         __asm__ __volatile__ (ASM_FTR_IFSET(PPC_MSGSND(%1), PPC_MSGSNDP(%1), %0)
  38                                 : : "i" (CPU_FTR_HVMODE), "r" (msg));
  39 }
  40
  41 /* sync before sending message */
  42 static inline void ppc_msgsnd_sync(void)
  43 {
  44         __asm__ __volatile__ ("sync" : : : "memory");
  45 }
  46
  47 /* sync after taking message interrupt */
  48 static inline void ppc_msgsync(void)
  49 {
  50         /* sync is not required when taking messages from the same core */
  51         __asm__ __volatile__ (ASM_FTR_IFSET(PPC_MSGSYNC " ; lwsync", "", %0)
  52                                 : : "i" (CPU_FTR_HVMODE|CPU_FTR_ARCH_300));
  53 }
  54
  55 static inline void _ppc_msgclr(u32 msg)
  56 {
  57         __asm__ __volatile__ (ASM_FTR_IFSET(PPC_MSGCLR(%1), PPC_MSGCLRP(%1), %0)
  58                                 : : "i" (CPU_FTR_HVMODE), "r" (msg));
  59 }
  60
  61 static inline void ppc_msgclr(enum ppc_dbell type)
  62 {
  63         u32 msg = PPC_DBELL_TYPE(type);
  64
  65         _ppc_msgclr(msg);
  66 }
  67
  68 #else /* CONFIG_PPC_BOOK3S */
  69
  70 #define PPC_DBELL_MSGTYPE               PPC_DBELL
  71
  72 static inline void _ppc_msgsnd(u32 msg)
  73 {
  74         __asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg));
  75 }
  76
  77 /* sync before sending message */
  78 static inline void ppc_msgsnd_sync(void)
  79 {
  80         __asm__ __volatile__ ("sync" : : : "memory");
  81 }
  82
  83 /* sync after taking message interrupt */
  84 static inline void ppc_msgsync(void)
  85 {
  86 }
  87
  88 #endif /* CONFIG_PPC_BOOK3S */
  89
  90 extern void doorbell_global_ipi(int cpu);
  91 extern void doorbell_core_ipi(int cpu);
  92 extern int doorbell_try_core_ipi(int cpu);
  93 extern void doorbell_exception(struct pt_regs *regs);
  94
  95 static inline void ppc_msgsnd(enum ppc_dbell type, u32 flags, u32 tag)
  96 {
  97         u32 msg = PPC_DBELL_TYPE(type) | (flags & PPC_DBELL_MSG_BRDCAST) |
  98                         (tag & 0x07ffffff);
  99
 100         _ppc_msgsnd(msg);
 101 }
 102
 103 #endif /* _ASM_POWERPC_DBELL_H */