diff options
| -rw-r--r-- | arch/powerpc/include/asm/cputable.h | 4 | ||||
| -rw-r--r-- | arch/powerpc/include/asm/dbell.h | 43 | ||||
| -rw-r--r-- | arch/powerpc/kernel/Makefile | 2 | ||||
| -rw-r--r-- | arch/powerpc/kernel/dbell.c | 44 | ||||
| -rw-r--r-- | arch/powerpc/kernel/head_fsl_booke.S | 6 | ||||
| -rw-r--r-- | arch/powerpc/kernel/traps.c | 21 |
6 files changed, 117 insertions, 3 deletions
diff --git a/arch/powerpc/include/asm/cputable.h b/arch/powerpc/include/asm/cputable.h index 4911104791c3..fca161190db4 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 000000000000..501189a543d1 --- /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 <linux/smp.h> +#include <linux/threads.h> + +#include <asm/ppc-opcode.h> + +#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 */ diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile index 583ba6493a62..dfec3d2790b2 100644 --- a/arch/powerpc/kernel/Makefile +++ b/arch/powerpc/kernel/Makefile @@ -59,7 +59,7 @@ obj-$(CONFIG_HIBERNATION) += swsusp.o suspend.o \ obj64-$(CONFIG_HIBERNATION) += swsusp_asm64.o obj-$(CONFIG_MODULES) += module.o module_$(CONFIG_WORD_SIZE).o obj-$(CONFIG_44x) += cpu_setup_44x.o -obj-$(CONFIG_FSL_BOOKE) += cpu_setup_fsl_booke.o +obj-$(CONFIG_FSL_BOOKE) += cpu_setup_fsl_booke.o dbell.o extra-$(CONFIG_PPC_STD_MMU) := head_32.o extra-$(CONFIG_PPC64) := head_64.o diff --git a/arch/powerpc/kernel/dbell.c b/arch/powerpc/kernel/dbell.c new file mode 100644 index 000000000000..1493734cd871 --- /dev/null +++ b/arch/powerpc/kernel/dbell.c @@ -0,0 +1,44 @@ +/* + * Author: Kumar Gala <galak@kernel.crashing.org> + * + * Copyright 2009 Freescale Semiconductor 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. + */ + +#include <linux/stddef.h> +#include <linux/kernel.h> +#include <linux/smp.h> +#include <linux/threads.h> + +#include <asm/dbell.h> + +#ifdef CONFIG_SMP +unsigned long dbell_smp_message[NR_CPUS]; + +void smp_dbell_message_pass(int target, int msg) +{ + int i; + + if(target < NR_CPUS) { + set_bit(msg, &dbell_smp_message[target]); + ppc_msgsnd(PPC_DBELL, 0, target); + } + else if(target == MSG_ALL_BUT_SELF) { + for_each_online_cpu(i) { + if (i == smp_processor_id()) + continue; + set_bit(msg, &dbell_smp_message[i]); + ppc_msgsnd(PPC_DBELL, 0, i); + } + } + else { /* target == MSG_ALL */ + for_each_online_cpu(i) + set_bit(msg, &dbell_smp_message[i]); + ppc_msgsnd(PPC_DBELL, PPC_DBELL_MSG_BRDCAST, 0); + } +} +#endif diff --git a/arch/powerpc/kernel/head_fsl_booke.S b/arch/powerpc/kernel/head_fsl_booke.S index 4ea6e1a7e4b9..4c22620d009b 100644 --- a/arch/powerpc/kernel/head_fsl_booke.S +++ b/arch/powerpc/kernel/head_fsl_booke.S @@ -698,7 +698,9 @@ interrupt_base: /* Performance Monitor */ EXCEPTION(0x2060, PerformanceMonitor, performance_monitor_exception, EXC_XFER_STD) - EXCEPTION(0x2070, Doorbell, unknown_exception, EXC_XFER_STD) + EXCEPTION(0x2070, Doorbell, doorbell_exception, EXC_XFER_STD) + + CRITICAL_EXCEPTION(0x2080, CriticalDoorbell, unknown_exception) /* Debug Interrupt */ DEBUG_DEBUG_EXCEPTION @@ -921,6 +923,8 @@ _GLOBAL(__setup_e500mc_ivors) mtspr SPRN_IVOR35,r3 li r3,Doorbell@l mtspr SPRN_IVOR36,r3 + li r3,CriticalDoorbell@l + mtspr SPRN_IVOR37,r3 sync blr diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c index 970d66ec4657..678fbff0d206 100644 --- a/arch/powerpc/kernel/traps.c +++ b/arch/powerpc/kernel/traps.c @@ -53,6 +53,9 @@ #endif #include <asm/kexec.h> #include <asm/ppc-opcode.h> +#ifdef CONFIG_FSL_BOOKE +#include <asm/dbell.h> +#endif #if defined(CONFIG_DEBUGGER) || defined(CONFIG_KEXEC) int (*__debugger)(struct pt_regs *regs); @@ -1122,6 +1125,24 @@ void vsx_assist_exception(struct pt_regs *regs) #endif /* CONFIG_VSX */ #ifdef CONFIG_FSL_BOOKE + +void doorbell_exception(struct pt_regs *regs) +{ +#ifdef CONFIG_SMP + int cpu = smp_processor_id(); + int msg; + + if (num_online_cpus() < 2) + return; + + for (msg = 0; msg < 4; msg++) + if (test_and_clear_bit(msg, &dbell_smp_message[cpu])) + smp_message_recv(msg); +#else + printk(KERN_WARNING "Received doorbell on non-smp system\n"); +#endif +} + void CacheLockingException(struct pt_regs *regs, unsigned long address, unsigned long error_code) { |
