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m68k: report correct FPU type on ColdFire MMU platforms 

Not all ColdFire SoC parts that have an MMU also have an FPU - so set
an FPU type (via m68k_fputype) appropriate for the configured platform.

With this set correctly /proc/cpuinfo will report FPU "none" on devices
that don't have one. And kernel code paths that initialize FPU hardware
will now only execute if an FPU is actually present.

Signed-off-by: Greg Ungerer <gerg@linux-m68k.org>
hifive-unleashed-5.1
Greg Ungerer 2016-08-25 23:12:22 +10:00
parent 81d33350ba
commit cbd5b982f6
3 changed files with 4 additions and 2 deletions
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4
arch/m68k/coldfire/head.S
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@ -280,8 +280,8 @@ _clear_bss:
movel %d0,m68k_cputype /* Mark us as a ColdFire */
movel #MMU_COLDFIRE,%d0
movel %d0,m68k_mmutype
movel #FPU_COLDFIRE,%d0
movel %d0,m68k_fputype
movel #FPUTYPE,%d0
movel %d0,m68k_fputype /* Mark FPU type */
movel #MACHINE,%d0
movel %d0,m68k_machtype /* Mark machine type */
lea init_task,%a2 /* Set "current" init task */

1
arch/m68k/include/asm/m5441xsim.h
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@ -11,6 +11,7 @@
#define CPU_INSTR_PER_JIFFY 2
#define MCF_BUSCLK (MCF_CLK / 2)
#define MACHINE MACH_M5441X
#define FPUTYPE 0
#include <asm/m54xxacr.h>

1
arch/m68k/include/asm/m54xxsim.h
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@ -9,6 +9,7 @@
#define CPU_INSTR_PER_JIFFY 2
#define MCF_BUSCLK (MCF_CLK / 2)
#define MACHINE MACH_M54XX
#define FPUTYPE FPU_COLDFIRE
#include <asm/m54xxacr.h>