nios2: Add NIOS2_ARCH_REVISION to select between R1 and R2

Allow user to select between Nios2 R1 and R2. Since R1 and R2 are
not binary compatible, we cannot have a single kernel binary and
there is no point in having DT property for discerning these two.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Ley Foon Tan <lftan@altera.com>

3 files changed, 13 insertions, 0 deletions

diff --git a/arch/nios2/Makefile b/arch/nios2/Makefile
index e74afc12d516..38da17e4c908 100644
--- a/arch/nios2/Makefile
+++ b/arch/nios2/Makefile
@@ -22,7 +22,10 @@ export MMU
 
 LIBGCC         := $(shell $(CC) $(KBUILD_CFLAGS) $(KCFLAGS) -print-libgcc-file-name)
 
+KBUILD_AFLAGS += -march=r$(CONFIG_NIOS2_ARCH_REVISION)
+
 KBUILD_CFLAGS += -pipe -D__linux__ -D__ELF__
+KBUILD_CFLAGS += -march=r$(CONFIG_NIOS2_ARCH_REVISION)
 KBUILD_CFLAGS += $(if $(CONFIG_NIOS2_HW_MUL_SUPPORT),-mhw-mul,-mno-hw-mul)
 KBUILD_CFLAGS += $(if $(CONFIG_NIOS2_HW_MULX_SUPPORT),-mhw-mulx,-mno-hw-mulx)
 KBUILD_CFLAGS += $(if $(CONFIG_NIOS2_HW_DIV_SUPPORT),-mhw-div,-mno-hw-div)
diff --git a/arch/nios2/kernel/cpuinfo.c b/arch/nios2/kernel/cpuinfo.c
index 1cccc36877bc..b4a6242b0f1c 100644
--- a/arch/nios2/kernel/cpuinfo.c
+++ b/arch/nios2/kernel/cpuinfo.c
@@ -125,12 +125,14 @@ static int show_cpuinfo(struct seq_file *m, void *v)
 
         seq_printf(m,
                    "CPU:\t\tNios II/%s\n"
+                   "REV:\t\t%i\n"
                    "MMU:\t\t%s\n"
                    "FPU:\t\tnone\n"
                    "Clocking:\t%u.%02u MHz\n"
                    "BogoMips:\t%lu.%02lu\n"
                    "Calibration:\t%lu loops\n",
                    cpuinfo.cpu_impl,
+                   CONFIG_NIOS2_ARCH_REVISION,
                    cpuinfo.mmu ? "present" : "none",
                    clockfreq / 1000000, (clockfreq / 100000) % 10,
                    (loops_per_jiffy * HZ) / 500000,
diff --git a/arch/nios2/platform/Kconfig.platform b/arch/nios2/platform/Kconfig.platform
index d3e5df9fb36b..b7ac5b90c399 100644
--- a/arch/nios2/platform/Kconfig.platform
+++ b/arch/nios2/platform/Kconfig.platform
@@ -52,6 +52,14 @@ config NIOS2_DTB_SOURCE
 
 comment "Nios II instructions"
 
+config NIOS2_ARCH_REVISION
+        int "Select Nios II architecture revision"
+        range 1 2
+        default 1
+        help
+          Select between Nios II R1 and Nios II R2 . The architectures
+          are binary incompatible. Default is R1 .
+
 config NIOS2_HW_MUL_SUPPORT
         bool "Enable MUL instruction"
         default n