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>

1 files changed, 44 insertions, 4 deletions

diff --git a/arch/mips/mm/c-r4k.c b/arch/mips/mm/c-r4k.c
index 587a14874f98..f2e8302fa70f 100644
--- a/arch/mips/mm/c-r4k.c
+++ b/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;