MIPS: Add minimal support for OCTEON3 to c-r4k.c

These are needed to boot a generic mips64r2 kernel on OCTEONIII.

Signed-off-by: David Daney <david.daney@cavium.com>
Signed-off-by: Andreas Herrmann <andreas.herrmann@caviumnetworks.com>
Cc: linux-mips@linux-mips.org
Cc: James Hogan <james.hogan@imgtec.com>
Cc: kvm@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/7003/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/include/asm/r4kcache.h

@@ -523,6 +523,8 @@ __BUILD_BLAST_CACHE(s, scache, Index_Writeback_Inv_SD, Hit_Writeback_Inv_SD, 32,
 __BUILD_BLAST_CACHE(d, dcache, Index_Writeback_Inv_D, Hit_Writeback_Inv_D, 64, )
 __BUILD_BLAST_CACHE(i, icache, Index_Invalidate_I, Hit_Invalidate_I, 64, )
 __BUILD_BLAST_CACHE(s, scache, Index_Writeback_Inv_SD, Hit_Writeback_Inv_SD, 64, )
+__BUILD_BLAST_CACHE(d, dcache, Index_Writeback_Inv_D, Hit_Writeback_Inv_D, 128, )
+__BUILD_BLAST_CACHE(i, icache, Index_Invalidate_I, Hit_Invalidate_I, 128, )
 __BUILD_BLAST_CACHE(s, scache, Index_Writeback_Inv_SD, Hit_Writeback_Inv_SD, 128, )
 
 __BUILD_BLAST_CACHE(inv_d, dcache, Index_Writeback_Inv_D, Hit_Invalidate_D, 16, )

arch/mips/mm/c-r4k.c

@@ -109,18 +109,34 @@ static inline void r4k_blast_dcache_page_dc64(unsigned long addr)
 	blast_dcache64_page(addr);
 }
 
+static inline void r4k_blast_dcache_page_dc128(unsigned long addr)
+{
+	blast_dcache128_page(addr);
+}
+
 static void r4k_blast_dcache_page_setup(void)
 {
 	unsigned long  dc_lsize = cpu_dcache_line_size();
 
-	if (dc_lsize == 0)
+	switch (dc_lsize) {
+	case 0:
 		r4k_blast_dcache_page = (void *)cache_noop;
-	else if (dc_lsize == 16)
+		break;
+	case 16:
 		r4k_blast_dcache_page = blast_dcache16_page;
-	else if (dc_lsize == 32)
+		break;
+	case 32:
 		r4k_blast_dcache_page = r4k_blast_dcache_page_dc32;
-	else if (dc_lsize == 64)
+		break;
+	case 64:
 		r4k_blast_dcache_page = r4k_blast_dcache_page_dc64;
+		break;
+	case 128:
+		r4k_blast_dcache_page = r4k_blast_dcache_page_dc128;
+		break;
+	default:
+		break;
+	}
 }
 
 #ifndef CONFIG_EVA
@@ -159,6 +175,8 @@ static void r4k_blast_dcache_page_indexed_setup(void)
 		r4k_blast_dcache_page_indexed = blast_dcache32_page_indexed;
 	else if (dc_lsize == 64)
 		r4k_blast_dcache_page_indexed = blast_dcache64_page_indexed;
+	else if (dc_lsize == 128)
+		r4k_blast_dcache_page_indexed = blast_dcache128_page_indexed;
 }
 
 void (* r4k_blast_dcache)(void);
@@ -176,6 +194,8 @@ static void r4k_blast_dcache_setup(void)
 		r4k_blast_dcache = blast_dcache32;
 	else if (dc_lsize == 64)
 		r4k_blast_dcache = blast_dcache64;
+	else if (dc_lsize == 128)
+		r4k_blast_dcache = blast_dcache128;
 }
 
 /* force code alignment (used for TX49XX_ICACHE_INDEX_INV_WAR) */
@@ -265,6 +285,8 @@ static void r4k_blast_icache_page_setup(void)
 		r4k_blast_icache_page = blast_icache32_page;
 	else if (ic_lsize == 64)
 		r4k_blast_icache_page = blast_icache64_page;
+	else if (ic_lsize == 128)
+		r4k_blast_icache_page = blast_icache128_page;
 }
 
 #ifndef CONFIG_EVA
@@ -338,6 +360,8 @@ static void r4k_blast_icache_setup(void)
 			r4k_blast_icache = blast_icache32;
 	} else if (ic_lsize == 64)
 		r4k_blast_icache = blast_icache64;
+	else if (ic_lsize == 128)
+		r4k_blast_icache = blast_icache128;
 }
 
 static void (* r4k_blast_scache_page)(unsigned long addr);
@@ -1094,6 +1118,21 @@ static void probe_pcache(void)
 		c->dcache.waybit = 0;
 		break;
 
+	case CPU_CAVIUM_OCTEON3:
+		/* For now lie about the number of ways. */
+		c->icache.linesz = 128;
+		c->icache.sets = 16;
+		c->icache.ways = 8;
+		c->icache.flags |= MIPS_CACHE_VTAG;
+		icache_size = c->icache.sets * c->icache.ways * c->icache.linesz;
+
+		c->dcache.linesz = 128;
+		c->dcache.ways = 8;
+		c->dcache.sets = 8;
+		dcache_size = c->dcache.sets * c->dcache.ways * c->dcache.linesz;
+		c->options |= MIPS_CPU_PREFETCH;
+		break;
+
 	default:
 		if (!(config & MIPS_CONF_M))
 			panic("Don't know how to probe P-caches on this cpu.");
@@ -1414,6 +1453,7 @@ static void setup_scache(void)
 		loongson3_sc_init();
 		return;
 
+	case CPU_CAVIUM_OCTEON3:
 	case CPU_XLP:
 		/* don't need to worry about L2, fully coherent */
 		return;