diff options
| author | Marek Vasut <marex@denx.de> | 2017-04-19 13:19:02 +0200 |
|---|---|---|
| committer | Ley Foon Tan <ley.foon.tan@intel.com> | 2017-05-08 16:59:19 +0800 |
| commit | edebea98777d7090ea14bdce2e38e6798557729d (patch) | |
| tree | 42d00a6c8e42ed6d2c04bf8d78c21fc2a0247ccf /arch | |
| parent | 23460839b983d5d8d47fe90f341599f66523dd81 (diff) | |
| download | linux-edebea98777d7090ea14bdce2e38e6798557729d.tar.bz2 | |
nios2: Add CDX support
Add support for the CDX Code Density Extensions present in
Nios II R2 . This introduces new 16bit instruction set to
improve code density while retaining support for the 32bit
Nios II R2 instructions.
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Ley Foon Tan <lftan@altera.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/nios2/Makefile | 1 | ||||
| -rw-r--r-- | arch/nios2/include/asm/cpuinfo.h | 1 | ||||
| -rw-r--r-- | arch/nios2/kernel/cpuinfo.c | 10 | ||||
| -rw-r--r-- | arch/nios2/platform/Kconfig.platform | 9 |
4 files changed, 19 insertions, 2 deletions
diff --git a/arch/nios2/Makefile b/arch/nios2/Makefile index 74109c01eaea..8673a79dca9c 100644 --- a/arch/nios2/Makefile +++ b/arch/nios2/Makefile @@ -30,6 +30,7 @@ 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) KBUILD_CFLAGS += $(if $(CONFIG_NIOS2_BMX_SUPPORT),-mbmx,-mno-bmx) +KBUILD_CFLAGS += $(if $(CONFIG_NIOS2_CDX_SUPPORT),-mcdx,-mno-cdx) KBUILD_CFLAGS += $(if $(CONFIG_NIOS2_FPU_SUPPORT),-mcustom-fpu-cfg=60-1,) KBUILD_CFLAGS += -fno-optimize-sibling-calls diff --git a/arch/nios2/include/asm/cpuinfo.h b/arch/nios2/include/asm/cpuinfo.h index 79d376435d7d..dbdaf96f28d4 100644 --- a/arch/nios2/include/asm/cpuinfo.h +++ b/arch/nios2/include/asm/cpuinfo.h @@ -30,6 +30,7 @@ struct cpuinfo { bool has_mul; bool has_mulx; bool has_bmx; + bool has_cdx; /* CPU caches */ u32 icache_line_size; diff --git a/arch/nios2/kernel/cpuinfo.c b/arch/nios2/kernel/cpuinfo.c index 4c84fec34882..93207718bb22 100644 --- a/arch/nios2/kernel/cpuinfo.c +++ b/arch/nios2/kernel/cpuinfo.c @@ -68,6 +68,7 @@ void __init setup_cpuinfo(void) cpuinfo.has_mul = of_property_read_bool(cpu, "altr,has-mul"); cpuinfo.has_mulx = of_property_read_bool(cpu, "altr,has-mulx"); cpuinfo.has_bmx = of_property_read_bool(cpu, "altr,has-bmx"); + cpuinfo.has_cdx = of_property_read_bool(cpu, "altr,has-cdx"); cpuinfo.mmu = of_property_read_bool(cpu, "altr,has-mmu"); if (IS_ENABLED(CONFIG_NIOS2_HW_DIV_SUPPORT) && !cpuinfo.has_div) @@ -82,6 +83,9 @@ void __init setup_cpuinfo(void) if (IS_ENABLED(CONFIG_NIOS2_BMX_SUPPORT) && !cpuinfo.has_bmx) err_cpu("BMX"); + if (IS_ENABLED(CONFIG_NIOS2_CDX_SUPPORT) && !cpuinfo.has_cdx) + err_cpu("CDX"); + cpuinfo.tlb_num_ways = fcpu(cpu, "altr,tlb-num-ways"); if (!cpuinfo.tlb_num_ways) panic("altr,tlb-num-ways can't be 0. Please check your hardware " @@ -148,11 +152,13 @@ static int show_cpuinfo(struct seq_file *m, void *v) " MUL:\t\t%s\n" " MULX:\t\t%s\n" " DIV:\t\t%s\n" - " BMX:\t\t%s\n", + " BMX:\t\t%s\n" + " CDX:\t\t%s\n", cpuinfo.has_mul ? "yes" : "no", cpuinfo.has_mulx ? "yes" : "no", cpuinfo.has_div ? "yes" : "no", - cpuinfo.has_bmx ? "yes" : "no"); + cpuinfo.has_bmx ? "yes" : "no", + cpuinfo.has_cdx ? "yes" : "no"); seq_printf(m, "Icache:\t\t%ukB, line length: %u\n", diff --git a/arch/nios2/platform/Kconfig.platform b/arch/nios2/platform/Kconfig.platform index b6a8bfd59491..74c1aaf588b8 100644 --- a/arch/nios2/platform/Kconfig.platform +++ b/arch/nios2/platform/Kconfig.platform @@ -90,6 +90,15 @@ config NIOS2_BMX_SUPPORT the BMX Bit Manipulation Extension instructions. Enables the -mbmx compiler flag. +config NIOS2_CDX_SUPPORT + bool "Enable CDX instructions" + depends on NIOS2_ARCH_REVISION = 2 + default n + help + Set to true if you configured the Nios II R2 to include + the CDX Bit Manipulation Extension instructions. Enables + the -mcdx compiler flag. + config NIOS2_FPU_SUPPORT bool "Custom floating point instr support" default n |