MIPS: Add microMIPS MSA support.

This patch adds support for the microMIPS implementation of the MSA
instructions.

Signed-off-by: Steven J. Hill <Steven.Hill@imgtec.com>
Reviewed-by: Paul Burton <Paul.Burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/6763/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/include/asm/asmmacro.h

@@ -249,13 +249,35 @@
 	.set	pop
 	.endm
 #else
+
+#ifdef CONFIG_CPU_MICROMIPS
+#define CFC_MSA_INSN		0x587e0056
+#define CTC_MSA_INSN		0x583e0816
+#define LDD_MSA_INSN		0x58000837
+#define STD_MSA_INSN		0x5800083f
+#define COPY_UW_MSA_INSN	0x58f00056
+#define COPY_UD_MSA_INSN	0x58f80056
+#define INSERT_W_MSA_INSN	0x59300816
+#define INSERT_D_MSA_INSN	0x59380816
+#else
+#define CFC_MSA_INSN		0x787e0059
+#define CTC_MSA_INSN		0x783e0819
+#define LDD_MSA_INSN		0x78000823
+#define STD_MSA_INSN		0x78000827
+#define COPY_UW_MSA_INSN	0x78f00059
+#define COPY_UD_MSA_INSN	0x78f80059
+#define INSERT_W_MSA_INSN	0x79300819
+#define INSERT_D_MSA_INSN	0x79380819
+#endif
+
 	/*
 	 * Temporary until all toolchains in use include MSA support.
 	 */
 	.macro	cfcmsa	rd, cs
 	.set	push
 	.set	noat
-	.word	0x787e0059 | (\cs << 11)
+	.insn
+	.word	CFC_MSA_INSN | (\cs << 11)
 	move	\rd, $1
 	.set	pop
 	.endm
@@ -264,7 +286,7 @@
 	.set	push
 	.set	noat
 	move	$1, \rs
-	.word	0x783e0819 | (\cd << 6)
+	.word	CTC_MSA_INSN | (\cd << 6)
 	.set	pop
 	.endm
 
@@ -272,7 +294,7 @@
 	.set	push
 	.set	noat
 	add	$1, \base, \off
-	.word	0x78000823 | (\wd << 6)
+	.word	LDD_MSA_INSN | (\wd << 6)
 	.set	pop
 	.endm
 
@@ -280,14 +302,15 @@
 	.set	push
 	.set	noat
 	add	$1, \base, \off
-	.word	0x78000827 | (\wd << 6)
+	.word	STD_MSA_INSN | (\wd << 6)
 	.set	pop
 	.endm
 
 	.macro	copy_u_w	rd, ws, n
 	.set	push
 	.set	noat
-	.word	0x78f00059 | (\n << 16) | (\ws << 11)
+	.insn
+	.word	COPY_UW_MSA_INSN | (\n << 16) | (\ws << 11)
 	/* move triggers an assembler bug... */
 	or	\rd, $1, zero
 	.set	pop
@@ -296,7 +319,8 @@
 	.macro	copy_u_d	rd, ws, n
 	.set	push
 	.set	noat
-	.word	0x78f80059 | (\n << 16) | (\ws << 11)
+	.insn
+	.word	COPY_UD_MSA_INSN | (\n << 16) | (\ws << 11)
 	/* move triggers an assembler bug... */
 	or	\rd, $1, zero
 	.set	pop
@@ -307,7 +331,7 @@
 	.set	noat
 	/* move triggers an assembler bug... */
 	or	$1, \rs, zero
-	.word	0x79300819 | (\n << 16) | (\wd << 6)
+	.word	INSERT_W_MSA_INSN | (\n << 16) | (\wd << 6)
 	.set	pop
 	.endm
 
@@ -316,7 +340,7 @@
 	.set	noat
 	/* move triggers an assembler bug... */
 	or	$1, \rs, zero
-	.word	0x79380819 | (\n << 16) | (\wd << 6)
+	.word	INSERT_D_MSA_INSN | (\n << 16) | (\wd << 6)
 	.set	pop
 	.endm
 #endif

arch/mips/include/asm/msa.h

@@ -96,6 +96,13 @@ static inline void write_msa_##name(unsigned int val)		\
  * allow compilation with toolchains that do not support MSA. Once all
  * toolchains in use support MSA these can be removed.
  */
+#ifdef CONFIG_CPU_MICROMIPS
+#define CFC_MSA_INSN	0x587e0056
+#define CTC_MSA_INSN	0x583e0816
+#else
+#define CFC_MSA_INSN	0x787e0059
+#define CTC_MSA_INSN	0x783e0819
+#endif
 
 #define __BUILD_MSA_CTL_REG(name, cs)				\
 static inline unsigned int read_msa_##name(void)		\
@@ -104,7 +111,8 @@ static inline unsigned int read_msa_##name(void)		\
 	__asm__ __volatile__(					\
 	"	.set	push\n"					\
 	"	.set	noat\n"					\
-	"	.word	0x787e0059 | (" #cs " << 11)\n"		\
+	"	.insn\n"					\
+	"	.word	#CFC_MSA_INSN | (" #cs " << 11)\n"	\
 	"	move	%0, $1\n"				\
 	"	.set	pop\n"					\
 	: "=r"(reg));						\
@@ -117,7 +125,8 @@ static inline void write_msa_##name(unsigned int val)		\
 	"	.set	push\n"					\
 	"	.set	noat\n"					\
 	"	move	$1, %0\n"				\
-	"	.word	0x783e0819 | (" #cs " << 6)\n"		\
+	"	.insn\n"					\
+	"	.word	#CTC_MSA_INSN | (" #cs " << 6)\n"	\
 	"	.set	pop\n"					\
 	: : "r"(val));						\
 }