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 */ 104