powerpc, 8xx: Move cache function into C files

Avoid unnecessary assembly functions when they can easily be written
in C.

Also remove dc_read() as it is nowhere referenced

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>

arch/powerpc/cpu/mpc8xx/Makefile

@@ -14,3 +14,4 @@ obj-$(CONFIG_CMD_IMMAP) += immap.o
 obj-y	+= interrupts.o
 obj-$(CONFIG_CMD_REGINFO) += reginfo.o
 obj-y	+= speed.o
+obj-y	+= cache.o

arch/powerpc/cpu/mpc8xx/cache.c

@@ -0,0 +1,49 @@
+/*
+ * (C) Copyright 2017
+ * Christophe Leroy, CS Systemes d'Information, christophe.leroy@c-s.fr
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/processor.h>
+#include <asm/ppc.h>
+#include <asm/io.h>
+#include <asm/mmu.h>
+
+int icache_status(void)
+{
+	return !!(mfspr(IC_CST) & IDC_ENABLED);
+}
+
+void icache_enable(void)
+{
+	sync();
+	mtspr(IC_CST, IDC_INVALL);
+	mtspr(IC_CST, IDC_ENABLE);
+}
+
+void icache_disable(void)
+{
+	sync();
+	mtspr(IC_CST, IDC_DISABLE);
+}
+
+int dcache_status(void)
+{
+	return !!(mfspr(IC_CST) & IDC_ENABLED);
+}
+
+void dcache_enable(void)
+{
+	mtspr(MD_CTR, MD_RESETVAL);	/* Set cache mode with MMU off */
+	mtspr(DC_CST, IDC_INVALL);
+	mtspr(DC_CST, IDC_ENABLE);
+}
+
+void dcache_disable(void)
+{
+	sync();
+	mtspr(DC_CST, IDC_DISABLE);
+	mtspr(DC_CST, IDC_INVALL);
+}

arch/powerpc/cpu/mpc8xx/start.S

@@ -305,62 +305,6 @@ int_return:
 	SYNC
 	rfi
 
-/* Cache functions.
-*/
-	.globl	icache_enable
-icache_enable:
-	SYNC
-	lis	r3, IDC_INVALL@h
-	mtspr	IC_CST, r3
-	lis	r3, IDC_ENABLE@h
-	mtspr	IC_CST, r3
-	blr
-
-	.globl	icache_disable
-icache_disable:
-	SYNC
-	lis	r3, IDC_DISABLE@h
-	mtspr	IC_CST, r3
-	blr
-
-	.globl	icache_status
-icache_status:
-	mfspr	r3, IC_CST
-	srwi	r3, r3, 31	/* >>31 => select bit 0 */
-	blr
-
-	.globl	dcache_enable
-dcache_enable:
-	lis	r3, 0x0400		/* Set cache mode with MMU off */
-	mtspr	MD_CTR, r3
-
-	lis	r3, IDC_INVALL@h
-	mtspr	DC_CST, r3
-	lis	r3, IDC_ENABLE@h
-	mtspr	DC_CST, r3
-	blr
-
-	.globl	dcache_disable
-dcache_disable:
-	SYNC
-	lis	r3, IDC_DISABLE@h
-	mtspr	DC_CST, r3
-	lis	r3, IDC_INVALL@h
-	mtspr	DC_CST, r3
-	blr
-
-	.globl	dcache_status
-dcache_status:
-	mfspr	r3, DC_CST
-	srwi	r3, r3, 31	/* >>31 => select bit 0 */
-	blr
-
-	.globl	dc_read
-dc_read:
-	mtspr	DC_ADR, r3
-	mfspr	r3, DC_DAT
-	blr
-
 /*
  * unsigned int get_immr (unsigned int mask)
  *