microblaze: Extend cpuinfo for support write-back caches

There is missing checking agains PVR but this is not important
for now. There are some missing checking too.

Signed-off-by: Michal Simek <monstr@monstr.eu>

3 files changed, 8 insertions, 2 deletions

diff --git a/arch/microblaze/include/asm/cpuinfo.h b/arch/microblaze/include/asm/cpuinfo.h
index aadf7a899d49..b4f5ca33aebf 100644
--- a/arch/microblaze/include/asm/cpuinfo.h
+++ b/arch/microblaze/include/asm/cpuinfo.h
@@ -53,6 +53,7 @@ struct cpuinfo {
         u32 dcache_write;
         u32 dcache_line_length;
         u32 dcache_size;
+        u32 dcache_wb;
         unsigned long dcache_base;
         unsigned long dcache_high;
 
diff --git a/arch/microblaze/kernel/cpu/cpuinfo-static.c b/arch/microblaze/kernel/cpu/cpuinfo-static.c
index 6558429eb973..6095aa6b5c88 100644
--- a/arch/microblaze/kernel/cpu/cpuinfo-static.c
+++ b/arch/microblaze/kernel/cpu/cpuinfo-static.c
@@ -96,6 +96,7 @@ void __init set_cpuinfo_static(struct cpuinfo *ci, struct device_node *cpu)
         ci->dcache_size = fcpu(cpu, "d-cache-size");
         ci->dcache_base = fcpu(cpu, "d-cache-baseaddr");
         ci->dcache_high = fcpu(cpu, "d-cache-highaddr");
+        ci->dcache_wb = fcpu(cpu, "xlnx,dcache-use-writeback");
 
         ci->use_dopb = fcpu(cpu, "xlnx,d-opb");
         ci->use_iopb = fcpu(cpu, "xlnx,i-opb");
diff --git a/arch/microblaze/kernel/cpu/mb.c b/arch/microblaze/kernel/cpu/mb.c
index 4dcfccdbc364..0c912b2a8e03 100644
--- a/arch/microblaze/kernel/cpu/mb.c
+++ b/arch/microblaze/kernel/cpu/mb.c
@@ -103,11 +103,15 @@ static int show_cpuinfo(struct seq_file *m, void *v)
         else
                 count += seq_printf(m, "Icache:\t\tno\n");
 
-        if (cpuinfo.use_dcache)
+        if (cpuinfo.use_dcache) {
                 count += seq_printf(m,
                                 "Dcache:\t\t%ukB\n",
                                 cpuinfo.dcache_size >> 10);
-        else
+                if (cpuinfo.dcache_wb)
+                        count += seq_printf(m, "\t\twrite-back\n");
+                else
+                        count += seq_printf(m, "\t\twrite-through\n");
+        } else
                 count += seq_printf(m, "Dcache:\t\tno\n");
 
         count += seq_printf(m,