MIPS: Loongson: Set Loongson32 to MIPS32R1

LS232 (Loonson 2-issue 32-bit, also called GS232 (Godson 2-issue 32-bit))
is the CPU core (microarchitecture) of Loongson 1A/1B/1C.

According to "LS232 用户手册 (LS232 User Manual)", LS232 implements the
MIPS32 Release 1 instruction set, and part of the MIPS32 Release 2
instruction set.

In the manual, LS232 implements all of the MIPS32R2 instruction set
except the FPU instructions, and LS232 also implements 5 FPU
instructions of the MIPS32R2 instruction set: CEIL.L.fmt, CVT.L.fmt,
FLOOR.L.fmt, TRUNC.L.fmt, and ROUND.L.fmt.

But a bug of the DI instruction has been found during tests, the DI
instruction can not disable interrupts in arch_local_irq_disable() with
CONFIG_PREEMPT_NONE=y and CFLAGS='-mno-branch-likely' in some cases.

[paul.burton@mips.com:
  - Remove the _MIPS_ISA redefinition to match the change made for the
    generic MIPSr1 CPUs by commit 344ebf09949c ("MIPS: Always use
    -march=<arch>, not -<arch> shortcuts").]

Signed-off-by: 谢致邦 (XIE Zhibang) <Yeking@Red54.com>
Signed-off-by: Paul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/16155/
Cc: linux-mips@linux-mips.org
Cc: ralf@linux-mips.org

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index c95eb5a..642a56e 100644 (file)
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -1424,7 +1424,8 @@ config CPU_LOONGSON1B
        select LEDS_GPIO_REGISTER
        help
          The Loongson 1B is a 32-bit SoC, which implements the MIPS32
-         release 2 instruction set.
+         Release 1 instruction set and part of the MIPS32 Release 2
+         instruction set.
 
 config CPU_LOONGSON1C
        bool "Loongson 1C"
@@ -1433,7 +1434,8 @@ config CPU_LOONGSON1C
        select LEDS_GPIO_REGISTER
        help
          The Loongson 1C is a 32-bit SoC, which implements the MIPS32
-         release 2 instruction set.
+         Release 1 instruction set and part of the MIPS32 Release 2
+         instruction set.
 
 config CPU_MIPS32_R1
        bool "MIPS32 Release 1"
@@ -1833,7 +1835,7 @@ config CPU_LOONGSON2
 config CPU_LOONGSON1
        bool
        select CPU_MIPS32
-       select CPU_MIPSR2
+       select CPU_MIPSR1
        select CPU_HAS_PREFETCH
        select CPU_SUPPORTS_32BIT_KERNEL
        select CPU_SUPPORTS_HIGHMEM

diff --git a/arch/mips/loongson32/Platform b/arch/mips/loongson32/Platform
index ffe01c6..90ac8f3 100644 (file)
--- a/arch/mips/loongson32/Platform
+++ b/arch/mips/loongson32/Platform
@@ -1,7 +1,4 @@
-cflags-$(CONFIG_CPU_LOONGSON1) += \
-       $(call cc-option,-march=mips32r2,-mips32r2 -U_MIPS_ISA -D_MIPS_ISA=_MIPS_ISA_MIPS32) \
-       -Wa,-mips32r2 -Wa,--trap
-
+cflags-$(CONFIG_CPU_LOONGSON1)         += -march=mips32 -Wa,--trap
 platform-$(CONFIG_MACH_LOONGSON32)     += loongson32/
 cflags-$(CONFIG_MACH_LOONGSON32)       += -I$(srctree)/arch/mips/include/asm/mach-loongson32
 load-$(CONFIG_LOONGSON1_LS1B)          += 0xffffffff80100000