MIPS: Loongson: Add GCC 4.4 support for Loongson2E

Because only gcc >=4.4 have loongson-specific support, we need to choose
the suitable -march argument for gcc <= 4.3 and gcc >= 4.4, and here, we
use -march=loongson2e for loongson2e.

Thanks goes to Arnaud Patard <apatard@mandriva.com> for suggestion of
using cc-options(Documentation/kbuild/makefiles.txt). and thanks Zhang
Le for introducing the new CPU_LOONGSON2E kernel option.

NOTE: -mtune option is not need if -march and -mtune use the same value.

Signed-off-by: Zhang Le <r0bertz@gentoo.org>
Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

3 files changed, 17 insertions, 9 deletions

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 482dcc3b91e1..466920aa067f 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -1030,12 +1030,10 @@ choice
         prompt "CPU type"
         default CPU_R4X00
 
-config CPU_LOONGSON2
-        bool "Loongson 2"
-        depends on SYS_HAS_CPU_LOONGSON2
-        select CPU_SUPPORTS_32BIT_KERNEL
-        select CPU_SUPPORTS_64BIT_KERNEL
-        select CPU_SUPPORTS_HIGHMEM
+config CPU_LOONGSON2E
+        bool "Loongson 2E"
+        depends on SYS_HAS_CPU_LOONGSON2E
+        select CPU_LOONGSON2
         help
           The Loongson 2E processor implements the MIPS III instruction set
           with many extensions.
@@ -1282,7 +1280,13 @@ config CPU_CAVIUM_OCTEON
 
 endchoice
 
-config SYS_HAS_CPU_LOONGSON2
+config CPU_LOONGSON2
+        bool
+        select CPU_SUPPORTS_32BIT_KERNEL
+        select CPU_SUPPORTS_64BIT_KERNEL
+        select CPU_SUPPORTS_HIGHMEM
+
+config SYS_HAS_CPU_LOONGSON2E
         bool
 
 config SYS_HAS_CPU_MIPS32_R1
diff --git a/arch/mips/Makefile b/arch/mips/Makefile
index 94d6f5813860..1efa9aa64880 100644
--- a/arch/mips/Makefile
+++ b/arch/mips/Makefile
@@ -120,7 +120,11 @@ cflags-$(CONFIG_CPU_R4300)	+= -march=r4300 -Wa,--trap
 cflags-$(CONFIG_CPU_VR41XX)     += -march=r4100 -Wa,--trap
 cflags-$(CONFIG_CPU_R4X00)      += -march=r4600 -Wa,--trap
 cflags-$(CONFIG_CPU_TX49XX)     += -march=r4600 -Wa,--trap
-cflags-$(CONFIG_CPU_LOONGSON2)  += -march=r4600 -Wa,--trap
+# only gcc >= 4.4 have the loongson-specific support
+cflags-$(CONFIG_CPU_LOONGSON2)  += -Wa,--trap
+cflags-$(CONFIG_CPU_LOONGSON2E) += \
+        $(call cc-option,-march=loongson2e,-march=r4600)
+
 cflags-$(CONFIG_CPU_MIPS32_R1)  += $(call cc-option,-march=mips32,-mips32 -U_MIPS_ISA -D_MIPS_ISA=_MIPS_ISA_MIPS32) \
                         -Wa,-mips32 -Wa,--trap
 cflags-$(CONFIG_CPU_MIPS32_R2)  += $(call cc-option,-march=mips32r2,-mips32r2 -U_MIPS_ISA -D_MIPS_ISA=_MIPS_ISA_MIPS32) \
diff --git a/arch/mips/loongson/Kconfig b/arch/mips/loongson/Kconfig
index 376712a0e2f1..d45092505fa1 100644
--- a/arch/mips/loongson/Kconfig
+++ b/arch/mips/loongson/Kconfig
@@ -7,7 +7,7 @@ config LEMOTE_FULOONG2E
     select ARCH_SPARSEMEM_ENABLE
     select CEVT_R4K
     select CSRC_R4K
-    select SYS_HAS_CPU_LOONGSON2
+    select SYS_HAS_CPU_LOONGSON2E
     select DMA_NONCOHERENT
     select BOOT_ELF32
     select BOARD_SCACHE