MIPS: Add build support for the MIPS R6 ISA

Add build support for the latest revision (R6) of the MIPS ISA.
microMIPS is not yet supported.

Link: http://www.linux-mips.org/archives/linux-mips/2015-01/msg00386.html
Cc: Maciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com>
Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>

2 files changed, 45 insertions, 4 deletions

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index b1b2de537860..c01e1d4e0db3 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -1305,6 +1305,21 @@ config CPU_MIPS32_R2
           specific type of processor in your system, choose those that one
           otherwise CPU_MIPS32_R1 is a safe bet for any MIPS32 system.
 
+config CPU_MIPS32_R6
+        bool "MIPS32 Release 6 (EXPERIMENTAL)"
+        depends on SYS_HAS_CPU_MIPS32_R6
+        select CPU_HAS_PREFETCH
+        select CPU_SUPPORTS_32BIT_KERNEL
+        select CPU_SUPPORTS_HIGHMEM
+        select CPU_SUPPORTS_MSA
+        select HAVE_KVM
+        select MIPS_O32_FP64_SUPPORT
+        help
+          Choose this option to build a kernel for release 6 or later of the
+          MIPS32 architecture.  New MIPS processors, starting with the Warrior
+          family, are based on a MIPS32r6 processor. If you own an older
+          processor, you probably need to select MIPS32r1 or MIPS32r2 instead.
+
 config CPU_MIPS64_R1
         bool "MIPS64 Release 1"
         depends on SYS_HAS_CPU_MIPS64_R1
@@ -1340,6 +1355,20 @@ config CPU_MIPS64_R2
           specific type of processor in your system, choose those that one
           otherwise CPU_MIPS64_R1 is a safe bet for any MIPS64 system.
 
+config CPU_MIPS64_R6
+        bool "MIPS64 Release 6 (EXPERIMENTAL)"
+        depends on SYS_HAS_CPU_MIPS64_R6
+        select CPU_HAS_PREFETCH
+        select CPU_SUPPORTS_32BIT_KERNEL
+        select CPU_SUPPORTS_64BIT_KERNEL
+        select CPU_SUPPORTS_HIGHMEM
+        select CPU_SUPPORTS_MSA
+        help
+          Choose this option to build a kernel for release 6 or later of the
+          MIPS64 architecture.  New MIPS processors, starting with the Warrior
+          family, are based on a MIPS64r6 processor. If you own an older
+          processor, you probably need to select MIPS64r1 or MIPS64r2 instead.
+
 config CPU_R3000
         bool "R3000"
         depends on SYS_HAS_CPU_R3000
@@ -1540,7 +1569,7 @@ endchoice
 config CPU_MIPS32_3_5_FEATURES
         bool "MIPS32 Release 3.5 Features"
         depends on SYS_HAS_CPU_MIPS32_R3_5
-        depends on CPU_MIPS32_R2
+        depends on CPU_MIPS32_R2 || CPU_MIPS32_R6
         help
           Choose this option to build a kernel for release 2 or later of the
           MIPS32 architecture including features from the 3.5 release such as
@@ -1660,12 +1689,18 @@ config SYS_HAS_CPU_MIPS32_R2
 config SYS_HAS_CPU_MIPS32_R3_5
         bool
 
+config SYS_HAS_CPU_MIPS32_R6
+        bool
+
 config SYS_HAS_CPU_MIPS64_R1
         bool
 
 config SYS_HAS_CPU_MIPS64_R2
         bool
 
+config SYS_HAS_CPU_MIPS64_R6
+        bool
+
 config SYS_HAS_CPU_R3000
         bool
 
@@ -1765,11 +1800,11 @@ endmenu
 #
 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
 
 #
 # These two indicate the revision of the architecture, either Release 1 or Release 2
@@ -1782,6 +1817,10 @@ config CPU_MIPSR2
         bool
         default y if CPU_MIPS32_R2 || CPU_MIPS64_R2 || CPU_CAVIUM_OCTEON
 
+config CPU_MIPSR6
+        bool
+        default y if CPU_MIPS32_R6 || CPU_MIPS64_R6
+
 config EVA
         bool
 
@@ -2149,7 +2188,7 @@ config CPU_HAS_SMARTMIPS
           here.
 
 config CPU_MICROMIPS
-        depends on 32BIT && SYS_SUPPORTS_MICROMIPS
+        depends on 32BIT && SYS_SUPPORTS_MICROMIPS && !CPU_MIPSR6
         bool "microMIPS"
         help
           When this option is enabled the kernel will be built using the
diff --git a/arch/mips/Makefile b/arch/mips/Makefile
index 61818364221d..aaee9a0b89bf 100644
--- a/arch/mips/Makefile
+++ b/arch/mips/Makefile
@@ -138,10 +138,12 @@ cflags-$(CONFIG_CPU_MIPS32_R1)	+= $(call cc-option,-march=mips32,-mips32 -U_MIPS
                         -Wa,-mips32 -Wa,--trap
 cflags-$(CONFIG_CPU_MIPS32_R2)  += $(call cc-option,-march=mips32r2,-mips32r2 -U_MIPS_ISA -D_MIPS_ISA=_MIPS_ISA_MIPS32) \
                         -Wa,-mips32r2 -Wa,--trap
+cflags-$(CONFIG_CPU_MIPS32_R6)  += -march=mips32r6 -Wa,--trap
 cflags-$(CONFIG_CPU_MIPS64_R1)  += $(call cc-option,-march=mips64,-mips64 -U_MIPS_ISA -D_MIPS_ISA=_MIPS_ISA_MIPS64) \
                         -Wa,-mips64 -Wa,--trap
 cflags-$(CONFIG_CPU_MIPS64_R2)  += $(call cc-option,-march=mips64r2,-mips64r2 -U_MIPS_ISA -D_MIPS_ISA=_MIPS_ISA_MIPS64) \
                         -Wa,-mips64r2 -Wa,--trap
+cflags-$(CONFIG_CPU_MIPS64_R6)  += -march=mips64r6 -Wa,--trap
 cflags-$(CONFIG_CPU_R5000)      += -march=r5000 -Wa,--trap
 cflags-$(CONFIG_CPU_R5432)      += $(call cc-option,-march=r5400,-march=r5000) \
                         -Wa,--trap