From 620165f971753c2c451c880796bac7cd66f3534a Mon Sep 17 00:00:00 2001 From: Kumar Gala Date: Thu, 12 Feb 2009 13:54:53 +0000 Subject: powerpc: Add support for using doorbells for SMP IPI The e500mc supports the new msgsnd/doorbell mechanisms that were added in the Power ISA 2.05 architecture. We use the normal level doorbell for doing SMP IPIs at this point. Signed-off-by: Kumar Gala Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/include/asm/cputable.h | 4 +++- arch/powerpc/include/asm/dbell.h | 43 +++++++++++++++++++++++++++++++++++++ 2 files changed, 46 insertions(+), 1 deletion(-) create mode 100644 arch/powerpc/include/asm/dbell.h (limited to 'arch/powerpc/include') diff --git a/arch/powerpc/include/asm/cputable.h b/arch/powerpc/include/asm/cputable.h index 4911104791c..fca161190db 100644 --- a/arch/powerpc/include/asm/cputable.h +++ b/arch/powerpc/include/asm/cputable.h @@ -145,6 +145,7 @@ extern const char *powerpc_base_platform; #define CPU_FTR_USE_TB ASM_CONST(0x0000000000000040) #define CPU_FTR_L2CSR ASM_CONST(0x0000000000000080) #define CPU_FTR_601 ASM_CONST(0x0000000000000100) +#define CPU_FTR_DBELL ASM_CONST(0x0000000000000200) #define CPU_FTR_CAN_NAP ASM_CONST(0x0000000000000400) #define CPU_FTR_L3CR ASM_CONST(0x0000000000000800) #define CPU_FTR_L3_DISABLE_NAP ASM_CONST(0x0000000000001000) @@ -373,7 +374,8 @@ extern const char *powerpc_base_platform; CPU_FTR_NODSISRALIGN | CPU_FTR_NOEXECUTE) #define CPU_FTRS_E500MC (CPU_FTR_MAYBE_CAN_DOZE | CPU_FTR_USE_TB | \ CPU_FTR_MAYBE_CAN_NAP | CPU_FTR_NODSISRALIGN | \ - CPU_FTR_L2CSR | CPU_FTR_LWSYNC | CPU_FTR_NOEXECUTE) + CPU_FTR_L2CSR | CPU_FTR_LWSYNC | CPU_FTR_NOEXECUTE | \ + CPU_FTR_DBELL) #define CPU_FTRS_GENERIC_32 (CPU_FTR_COMMON | CPU_FTR_NODSISRALIGN) /* 64-bit CPUs */ diff --git a/arch/powerpc/include/asm/dbell.h b/arch/powerpc/include/asm/dbell.h new file mode 100644 index 00000000000..501189a543d --- /dev/null +++ b/arch/powerpc/include/asm/dbell.h @@ -0,0 +1,43 @@ +/* + * Copyright 2009 Freescale Semicondutor, Inc. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + * + * provides masks and opcode images for use by code generation, emulation + * and for instructions that older assemblers might not know about + */ +#ifndef _ASM_POWERPC_DBELL_H +#define _ASM_POWERPC_DBELL_H + +#include +#include + +#include + +#define PPC_DBELL_MSG_BRDCAST (0x04000000) +#define PPC_DBELL_TYPE(x) (((x) & 0xf) << 28) +enum ppc_dbell { + PPC_DBELL = 0, /* doorbell */ + PPC_DBELL_CRIT = 1, /* critical doorbell */ + PPC_G_DBELL = 2, /* guest doorbell */ + PPC_G_DBELL_CRIT = 3, /* guest critical doorbell */ + PPC_G_DBELL_MC = 4, /* guest mcheck doorbell */ +}; + +#ifdef CONFIG_SMP +extern unsigned long dbell_smp_message[NR_CPUS]; +extern void smp_dbell_message_pass(int target, int msg); +#endif + +static inline void ppc_msgsnd(enum ppc_dbell type, u32 flags, u32 tag) +{ + u32 msg = PPC_DBELL_TYPE(type) | (flags & PPC_DBELL_MSG_BRDCAST) | + (tag & 0x07ffffff); + + __asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg)); +} + +#endif /* _ASM_POWERPC_DBELL_H */ -- cgit v1.2.3