MIPS: Support for targetting MIPSr6

Add support for targetting MIPS32r6 & MIPS64r6 systems, in the same way
that we currently select release 1 or release 2 targets. MIPSr6 is not
entirely backwards compatible with earlier releases of the architecture.
Some instructions are encoded differently, some are removed, some are
reused, so it is not practical to run U-Boot built for earlier revisions
on a MIPSr6 system. Update their Kconfig help text to reflect that.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 6acd1f4..994168c 100644 (file)
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -104,7 +104,7 @@ config CPU_MIPS32_R1
        depends on SUPPORTS_CPU_MIPS32_R1
        select 32BIT
        help
-         Choose this option to build an U-Boot for release 1 or later of the
+         Choose this option to build an U-Boot for release 1 through 5 of the
          MIPS32 architecture.
 
 config CPU_MIPS32_R2
@@ -112,7 +112,15 @@ config CPU_MIPS32_R2
        depends on SUPPORTS_CPU_MIPS32_R2
        select 32BIT
        help
-         Choose this option to build an U-Boot for release 2 or later of the
+         Choose this option to build an U-Boot for release 2 through 5 of the
+         MIPS32 architecture.
+
+config CPU_MIPS32_R6
+       bool "MIPS32 Release 6"
+       depends on SUPPORTS_CPU_MIPS32_R6
+       select 32BIT
+       help
+         Choose this option to build an U-Boot for release 6 or later of the
          MIPS32 architecture.
 
 config CPU_MIPS64_R1
@@ -120,7 +128,7 @@ config CPU_MIPS64_R1
        depends on SUPPORTS_CPU_MIPS64_R1
        select 64BIT
        help
-         Choose this option to build a kernel for release 1 or later of the
+         Choose this option to build a kernel for release 1 through 5 of the
          MIPS64 architecture.
 
 config CPU_MIPS64_R2
@@ -128,7 +136,15 @@ config CPU_MIPS64_R2
        depends on SUPPORTS_CPU_MIPS64_R2
        select 64BIT
        help
-         Choose this option to build a kernel for release 2 or later of the
+         Choose this option to build a kernel for release 2 through 5 of the
+         MIPS64 architecture.
+
+config CPU_MIPS64_R6
+       bool "MIPS64 Release 6"
+       depends on SUPPORTS_CPU_MIPS64_R6
+       select 64BIT
+       help
+         Choose this option to build a kernel for release 6 or later of the
          MIPS64 architecture.
 
 endchoice
@@ -175,19 +191,25 @@ config SUPPORTS_CPU_MIPS32_R1
 config SUPPORTS_CPU_MIPS32_R2
        bool
 
+config SUPPORTS_CPU_MIPS32_R6
+       bool
+
 config SUPPORTS_CPU_MIPS64_R1
        bool
 
 config SUPPORTS_CPU_MIPS64_R2
        bool
 
+config SUPPORTS_CPU_MIPS64_R6
+       bool
+
 config CPU_MIPS32
        bool
-       default y if CPU_MIPS32_R1 || CPU_MIPS32_R2
+       default y if CPU_MIPS32_R1 || CPU_MIPS32_R2 || CPU_MIPS32_R6
 
 config CPU_MIPS64
        bool
-       default y if CPU_MIPS64_R1 || CPU_MIPS64_R2
+       default y if CPU_MIPS64_R1 || CPU_MIPS64_R2 || CPU_MIPS64_R6
 
 config MIPS_TUNE_4KC
        bool

diff --git a/arch/mips/Makefile b/arch/mips/Makefile
index 94f7e16..655a493 100644 (file)
--- a/arch/mips/Makefile
+++ b/arch/mips/Makefile
@@ -19,8 +19,10 @@ PLATFORM_CPPFLAGS += $(patsubst %,-I$(srctree)/%include,$(machdirs))
 # Optimize for MIPS architectures
 arch-$(CONFIG_CPU_MIPS32_R1) += -march=mips32 -Wa,-mips32
 arch-$(CONFIG_CPU_MIPS32_R2) += -march=mips32r2 -Wa,-mips32r2
+arch-$(CONFIG_CPU_MIPS32_R6) += -march=mips32r6 -Wa,-mips32r6
 arch-$(CONFIG_CPU_MIPS64_R1) += -march=mips64 -Wa,-mips64
 arch-$(CONFIG_CPU_MIPS64_R2) += -march=mips64r2 -Wa,-mips64r2
+arch-$(CONFIG_CPU_MIPS64_R6) += -march=mips64r6 -Wa,-mips64r6
 
 # Allow extra optimization for specific CPUs/SoCs
 tune-$(CONFIG_MIPS_TUNE_4KC) += -mtune=4kc