MIPS: Add detection of DSP ASE Revision 2.

[ralf@linux-mips.org: This patch really only detects the ASE and passes its
existence on to userland via /proc/cpuinfo.  The DSP ASE Rev 2. adds new
resources but no resources that would need management by the kernel.]

Signed-off-by: Steven J. Hill <sjhill@mips.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/4165/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/include/asm/cpu-features.h

@@ -171,6 +171,10 @@
 #define cpu_has_dsp		(cpu_data[0].ases & MIPS_ASE_DSP)
 #endif
 
+#ifndef cpu_has_dsp2
+#define cpu_has_dsp2		(cpu_data[0].ases & MIPS_ASE_DSP2P)
+#endif
+
 #ifndef cpu_has_mipsmt
 #define cpu_has_mipsmt		(cpu_data[0].ases & MIPS_ASE_MIPSMT)
 #endif

arch/mips/include/asm/cpu.h

@@ -332,6 +332,7 @@ enum cpu_type_enum {
 #define MIPS_ASE_SMARTMIPS	0x00000008 /* SmartMIPS */
 #define MIPS_ASE_DSP		0x00000010 /* Signal Processing ASE */
 #define MIPS_ASE_MIPSMT		0x00000020 /* CPU supports MIPS MT */
+#define MIPS_ASE_DSP2P		0x00000040 /* Signal Processing ASE Rev 2 */
 
 
 #endif /* _ASM_CPU_H */

arch/mips/include/asm/mipsregs.h

@@ -592,6 +592,7 @@
 #define MIPS_CONF3_VEIC		(_ULCAST_(1) <<  6)
 #define MIPS_CONF3_LPA		(_ULCAST_(1) <<  7)
 #define MIPS_CONF3_DSP		(_ULCAST_(1) << 10)
+#define MIPS_CONF3_DSP2P	(_ULCAST_(1) << 11)
 #define MIPS_CONF3_RXI		(_ULCAST_(1) << 12)
 #define MIPS_CONF3_ULRI		(_ULCAST_(1) << 13)
 

arch/mips/kernel/cpu-probe.c

@@ -142,7 +142,7 @@ int __cpuinitdata mips_dsp_disabled;
 
 static int __init dsp_disable(char *s)
 {
-	cpu_data[0].ases &= ~MIPS_ASE_DSP;
+	cpu_data[0].ases &= ~(MIPS_ASE_DSP | MIPS_ASE_DSP2P);
 	mips_dsp_disabled = 1;
 
 	return 1;
@@ -429,6 +429,8 @@ static inline unsigned int decode_config3(struct cpuinfo_mips *c)
 		c->options |= MIPS_CPU_RIXI;
 	if (config3 & MIPS_CONF3_DSP)
 		c->ases |= MIPS_ASE_DSP;
+	if (config3 & MIPS_CONF3_DSP2P)
+		c->ases |= MIPS_ASE_DSP2P;
 	if (config3 & MIPS_CONF3_VINT)
 		c->options |= MIPS_CPU_VINT;
 	if (config3 & MIPS_CONF3_VEIC)
@@ -1180,7 +1182,7 @@ __cpuinit void cpu_probe(void)
 		c->options &= ~MIPS_CPU_FPU;
 
 	if (mips_dsp_disabled)
-		c->ases &= ~MIPS_ASE_DSP;
+		c->ases &= ~(MIPS_ASE_DSP | MIPS_ASE_DSP2P);
 
 	if (c->options & MIPS_CPU_FPU) {
 		c->fpu_id = cpu_get_fpu_id();

arch/mips/kernel/proc.c

@@ -70,6 +70,7 @@ static int show_cpuinfo(struct seq_file *m, void *v)
 		      cpu_has_mips3d ? " mips3d" : "",
 		      cpu_has_smartmips ? " smartmips" : "",
 		      cpu_has_dsp ? " dsp" : "",
+		      cpu_has_dsp2 ? " dsp2" : "",
 		      cpu_has_mipsmt ? " mt" : ""
 		);
 	seq_printf(m, "shadow register sets\t: %d\n",