powerpc: Add 64-bit CPU targets for gcc

Add a menu to select various 64-bit CPU targets for gcc. We
default to -mtune=power7 and if gcc doesn't understand that we
fallback to -mtune=power4.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index 6ee3beb4d2646b0407c61168c624b4cdd127247a..159e94f4b22aa3b808587812ccc013ff7bc18ee7 100644 (file)
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -69,6 +69,16 @@ LDFLAGS_vmlinux      := $(LDFLAGS_vmlinux-y)
 
 CFLAGS-$(CONFIG_PPC64) := -mminimal-toc -mtraceback=no -mcall-aixdesc
 CFLAGS-$(CONFIG_PPC32) := -ffixed-r2 -mmultiple
+
+CFLAGS-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=power7,-mtune=power4)
+CFLAGS-$(CONFIG_CELL_CPU) += $(call cc-option,-mcpu=cell)
+CFLAGS-$(CONFIG_POWER4_CPU) += $(call cc-option,-mcpu=power4)
+CFLAGS-$(CONFIG_POWER5_CPU) += $(call cc-option,-mcpu=power5)
+CFLAGS-$(CONFIG_POWER6_CPU) += $(call cc-option,-mcpu=power6)
+CFLAGS-$(CONFIG_POWER7_CPU) += $(call cc-option,-mcpu=power7)
+
+CFLAGS-$(CONFIG_TUNE_CELL) += $(call cc-option,-mtune=cell)
+
 KBUILD_CPPFLAGS        += -Iarch/$(ARCH)
 KBUILD_AFLAGS  += -Iarch/$(ARCH)
 KBUILD_CFLAGS  += -msoft-float -pipe -Iarch/$(ARCH) $(CFLAGS-y)
@@ -76,22 +86,11 @@ CPP         = $(CC) -E $(KBUILD_CFLAGS)
 
 CHECKFLAGS     += -m$(CONFIG_WORD_SIZE) -D__powerpc__ -D__powerpc$(CONFIG_WORD_SIZE)__
 
-ifeq ($(CONFIG_PPC64),y)
-ifeq ($(CONFIG_POWER4_ONLY),y)
-       KBUILD_CFLAGS += $(call cc-option,-mcpu=power4)
-else
-       KBUILD_CFLAGS += $(call cc-option,-mtune=power4)
-endif
-endif
-
 KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o
 
-ifeq ($(CONFIG_TUNE_CELL),y)
-       KBUILD_CFLAGS += $(call cc-option,-mtune=cell)
-endif
-
-# No AltiVec instruction when building kernel
+# No AltiVec or VSX instructions when building kernel
 KBUILD_CFLAGS += $(call cc-option,-mno-altivec)
+KBUILD_CFLAGS += $(call cc-option,-mno-vsx)
 
 # No SPE instruction when building kernel
 # (We use all available options to help semi-broken compilers)

diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
index 52e70f9b7a8f269ab4e66ab37995715f6ce2e532..0b73145921348a020c8355932f6e45352d84be39 100644 (file)
--- a/arch/powerpc/platforms/Kconfig.cputype
+++ b/arch/powerpc/platforms/Kconfig.cputype
@@ -78,6 +78,36 @@ config PPC_BOOK3E_64
 
 endchoice
 
+choice
+       prompt "CPU selection"
+       depends on PPC64
+       default GENERIC_CPU
+       help
+         This will create a kernel which is optimised for a particular CPU.
+         The resulting kernel may not run on other CPUs, so use this with care.
+
+         If unsure, select Generic.
+
+config GENERIC_CPU
+       bool "Generic"
+
+config CELL_CPU
+       bool "Cell Broadband Engine"
+
+config POWER4_CPU
+       bool "POWER4"
+
+config POWER5_CPU
+       bool "POWER5"
+
+config POWER6_CPU
+       bool "POWER6"
+
+config POWER7_CPU
+       bool "POWER7"
+
+endchoice
+
 config PPC_BOOK3S
        def_bool y
        depends on PPC_BOOK3S_32 || PPC_BOOK3S_64