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MIPS: MIPS16e2: Identify ASE presence

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Identify the presence of the MIPS16e2 ASE as per the architecture
specification[1], by checking for CP0 Config5.CA2 bit being 1[2].

References:

[1] "MIPS32 Architecture for Programmers: MIPS16e2 Application-Specific
    Extension Technical Reference Manual", Imagination Technologies
    Ltd., Document Number: MD01172, Revision 01.00, April 26, 2016,
    Section 1.2 "Software Detection of the ASE", p. 5

[2] "MIPS32 interAptiv Multiprocessing System Software User's Manual",
    Imagination Technologies Ltd., Document Number: MD00904, Revision
    02.01, June 15, 2016, Section 2.2.1.6 "Device Configuration 5 --
    Config5 (CP0 Register 16, Select 5)", pp. 71-72

Signed-off-by: Maciej W. Rozycki <macro@imgtec.com>
Reviewed-by: James Hogan <james.hogan@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/16094/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Maciej W. Rozycki 2017-05-23 13:37:05 +01:00 committed by Ralf Baechle
parent bdb94f6e82
commit 8d1630f137
4 changed files with 7 additions and 0 deletions
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3
arch/mips/include/asm/cpu-features.h
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@ -138,6 +138,9 @@
#ifndef cpu_has_mips16
#define cpu_has_mips16 (cpu_data[0].ases & MIPS_ASE_MIPS16)
#endif
#ifndef cpu_has_mips16e2
#define cpu_has_mips16e2 (cpu_data[0].ases & MIPS_ASE_MIPS16E2)
#endif
#ifndef cpu_has_mdmx
#define cpu_has_mdmx (cpu_data[0].ases & MIPS_ASE_MDMX)
#endif

1
arch/mips/include/asm/cpu.h
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@ -436,5 +436,6 @@ enum cpu_type_enum {
#define MIPS_ASE_VZ 0x00000080 /* Virtualization ASE */
#define MIPS_ASE_MSA 0x00000100 /* MIPS SIMD Architecture */
#define MIPS_ASE_DSP3 0x00000200 /* Signal Processing ASE Rev 3*/
#define MIPS_ASE_MIPS16E2 0x00000400 /* MIPS16e2 */
#endif /* _ASM_CPU_H */

1
arch/mips/include/asm/mipsregs.h
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@ -652,6 +652,7 @@
#define MIPS_CONF5_SBRI (_ULCAST_(1) << 6)
#define MIPS_CONF5_FRE (_ULCAST_(1) << 8)
#define MIPS_CONF5_UFE (_ULCAST_(1) << 9)
#define MIPS_CONF5_CA2 (_ULCAST_(1) << 14)
#define MIPS_CONF5_MSAEN (_ULCAST_(1) << 27)
#define MIPS_CONF5_EVA (_ULCAST_(1) << 28)
#define MIPS_CONF5_CV (_ULCAST_(1) << 29)

2
arch/mips/kernel/cpu-probe.c
View File

@ -845,6 +845,8 @@ static inline unsigned int decode_config5(struct cpuinfo_mips *c)
c->options |= MIPS_CPU_MVH;
if (cpu_has_mips_r6 && (config5 & MIPS_CONF5_VP))
c->options |= MIPS_CPU_VP;
if (config5 & MIPS_CONF5_CA2)
c->ases |= MIPS_ASE_MIPS16E2;
return config5 & MIPS_CONF_M;
}