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authorKumar Gala <galak@kernel.crashing.org>2009-02-12 13:54:53 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2009-02-23 15:53:03 +1100
commit620165f971753c2c451c880796bac7cd66f3534a (patch)
tree1ec36dc067ff0af865f4f6954dbea84ef4205294 /arch/powerpc/include/asm/dbell.h
parent6ed8d12849d651c646c108807754a544d2e506f1 (diff)
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 <galak@kernel.crashing.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/include/asm/dbell.h')
-rw-r--r--arch/powerpc/include/asm/dbell.h43
1 files changed, 43 insertions, 0 deletions
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 <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 */