Commit edebea98 authored by Marek Vasut's avatar Marek Vasut Committed by Ley Foon Tan
Browse files

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: default avatarMarek Vasut <marex@denx.de>
Cc: Ley Foon Tan <lftan@altera.com>
parent 23460839

arch/nios2/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -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

arch/nios2/include/asm/cpuinfo.h

+1 −0
Original line number Diff line number Diff line
@@ -30,6 +30,7 @@ struct cpuinfo { 
	bool has_mul;

	bool has_mulx;

	bool has_bmx;

	bool has_cdx;



	/* CPU caches */

	u32 icache_line_size;

arch/nios2/kernel/cpuinfo.c

+8 −2
Original line number Diff line number Diff line
@@ -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",

arch/nios2/platform/Kconfig.platform

+9 −0
Original line number Diff line number Diff line
@@ -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

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