[PATCH v2 07/20] mips: Add MIPS Warrior P5600 support

Sergey.Semin
2020-05-06T17:45:11Z

From: Serge Semin <Sergey.Semin@baikalelectronics.ru>

This is a MIPS32 Release 5 based IP core with XPA, EVA, dual/quad issue
exec pipes, MMU with two-levels TLB, UCA, MSA, MDU core level features
and system level features like up to six P5600 calculation cores, CM2
with L2 cache, IOCU/IOMMU (though might be unused depending on the
system-specific IP core configuration), GIC, CPC, virtualisation module,
eJTAG and PDtrace.

As being MIPS32 Release 5 based core it provides all the features
available by the CPU_MIPS32_R5 config, while adding a few more like
UCA attribute support, availability of CPU-freq (by means of L2/CM
clock ratio setting), EI/VI GIC modes detection at runtime.

In addition to this if P5600 architecture is enabled modern GNU GCC
provides a specific tuning for P5600 processors with respect to the
classic MIPS32 Release 5. First of all branch-likely avoidance is
activated only when the code is compiled with the speed optimization
(avoidance is always enabled for the pure MIPS32 Release 5
architecture). Secondly the madd/msub avoidance is enabled since
madd/msub utilization isn't profitable due to overhead of getting the
result out of the HI/LO registers. Multiply-accumulate instructions are
activated and utilized together with the necessary code reorder when
multiply-add/multiply-subtract statements are met. Finally load/store
bonding is activated by default. All of these optimizations may make
the code relatively faster than if just MIP32 release 5 architecture
was requested.

Co-developed-by: Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>
Signed-off-by: Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>
Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Paul Burton <paulburton@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: linux-pm@vger.kernel.org
Cc: devicetree@vger.kernel.org
---
arch/mips/Kconfig | 38 +++++++++++++++++++++++++++-----
arch/mips/Makefile | 1 +
arch/mips/include/asm/vermagic.h | 2 ++
3 files changed, 36 insertions(+), 5 deletions(-)

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 55c3dbfea336..e3b780a389a9 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -1665,6 +1665,28 @@ config CPU_MIPS64_R6
family, are based on a MIPS64r6 processor. If you own an older
processor, you probably need to select MIPS64r1 or MIPS64r2 instead.

+config CPU_P5600
+ bool "MIPS Warrior P5600"
+ depends on SYS_HAS_CPU_P5600
+ select CPU_HAS_PREFETCH
+ select CPU_SUPPORTS_32BIT_KERNEL
+ select CPU_SUPPORTS_HIGHMEM
+ select CPU_SUPPORTS_MSA
+ select CPU_SUPPORTS_UNCACHED_ACCELERATED
+ select CPU_SUPPORTS_CPUFREQ
+ select CPU_MIPSR2_IRQ_VI
+ select CPU_MIPSR2_IRQ_EI
+ select HAVE_KVM
+ select MIPS_O32_FP64_SUPPORT
+ help
+ Choose this option to build a kernel for MIPS Warrior P5600 CPU.
+ It's based on MIPS32r5 ISA with XPA, EVA, dual/quad issue exec pipes,
+ MMU with two-levels TLB, UCA, MSA, MDU core level features and system
+ level features like up to six P5600 calculation cores, CM2 with L2
+ cache, IOCU/IOMMU (though might be unused depending on the system-
+ specific IP core configuration), GIC, CPC, virtualisation module,
+ eJTAG and PDtrace.
+
config CPU_R3000
bool "R3000"
depends on SYS_HAS_CPU_R3000
@@ -1841,7 +1863,8 @@ 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 || CPU_MIPS32_R5 || CPU_MIPS32_R6
+ depends on CPU_MIPS32_R2 || CPU_MIPS32_R5 || CPU_MIPS32_R6 || \
+ CPU_P5600
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
@@ -1861,7 +1884,7 @@ config CPU_MIPS32_3_5_EVA
config CPU_MIPS32_R5_FEATURES
bool "MIPS32 Release 5 Features"
depends on SYS_HAS_CPU_MIPS32_R5
- depends on CPU_MIPS32_R2 || CPU_MIPS32_R5
+ depends on CPU_MIPS32_R2 || CPU_MIPS32_R5 || CPU_P5600
help
Choose this option to build a kernel for release 2 or later of the
MIPS32 architecture including features from release 5 such as
@@ -2016,6 +2039,10 @@ config SYS_HAS_CPU_MIPS64_R6
bool
select ARCH_HAS_SYNC_DMA_FOR_CPU if DMA_NONCOHERENT

+config SYS_HAS_CPU_P5600
+ bool
+ select ARCH_HAS_SYNC_DMA_FOR_CPU if DMA_NONCOHERENT
+
config SYS_HAS_CPU_R3000
bool

@@ -2100,7 +2127,7 @@ endmenu
config CPU_MIPS32
bool
default y if CPU_MIPS32_R1 || CPU_MIPS32_R2 || CPU_MIPS32_R5 || \
- CPU_MIPS32_R6
+ CPU_MIPS32_R6 || CPU_P5600

config CPU_MIPS64
bool
@@ -2122,7 +2149,7 @@ config CPU_MIPSR2

config CPU_MIPSR5
bool
- default y if CPU_MIPS32_R5
+ default y if CPU_MIPS32_R5 || CPU_P5600
select CPU_HAS_RIXI
select CPU_HAS_DIEI if !CPU_DIEI_BROKEN
select MIPS_SPRAM
@@ -2733,7 +2760,8 @@ config RELOCATABLE
bool "Relocatable kernel"
depends on SYS_SUPPORTS_RELOCATABLE
depends on CPU_MIPS32_R2 || CPU_MIPS64_R2 || CPU_MIPS32_R5 || \
- CPU_MIPS32_R6 || CPU_MIPS64_R6 || CAVIUM_OCTEON_SOC
+ CPU_MIPS32_R6 || CPU_MIPS64_R6 || CPU_P5600 || \
+ CAVIUM_OCTEON_SOC
help
This builds a kernel image that retains relocation information
so it can be loaded someplace besides the default 1MB.
diff --git a/arch/mips/Makefile b/arch/mips/Makefile
index 9172fb0f630b..264dead560f4 100644
--- a/arch/mips/Makefile
+++ b/arch/mips/Makefile
@@ -176,6 +176,7 @@ cflags-$(CONFIG_CPU_MIPS32_R6) += -march=mips32r6 -Wa,--trap -modd-spreg
cflags-$(CONFIG_CPU_MIPS64_R1) += -march=mips64 -Wa,--trap
cflags-$(CONFIG_CPU_MIPS64_R2) += -march=mips64r2 -Wa,--trap
cflags-$(CONFIG_CPU_MIPS64_R6) += -march=mips64r6 -Wa,--trap
+cflags-$(CONFIG_CPU_P5600) += -march=p5600 -Wa,--trap -modd-spreg
cflags-$(CONFIG_CPU_R5000) += -march=r5000 -Wa,--trap
cflags-$(CONFIG_CPU_R5500) += $(call cc-option,-march=r5500,-march=r5000) \
-Wa,--trap
diff --git a/arch/mips/include/asm/vermagic.h b/arch/mips/include/asm/vermagic.h
index 5a0e739f597a..d03f97350f91 100644
--- a/arch/mips/include/asm/vermagic.h
+++ b/arch/mips/include/asm/vermagic.h
@@ -48,6 +48,8 @@
#define MODULE_PROC_FAMILY "LOONGSON64 "
#elif defined CONFIG_CPU_CAVIUM_OCTEON
#define MODULE_PROC_FAMILY "OCTEON "
+#elif defined CONFIG_CPU_P5600
+#define MODULE_PROC_FAMILY "P5600 "
#elif defined CONFIG_CPU_XLR
#define MODULE_PROC_FAMILY "XLR "
#elif defined CONFIG_CPU_XLP
--
2.25.1