EDAC, altera: Simplify calculation of total memory

Use of_address_to_resource() and resource_size() instead of manually
parsing the "reg" property from the "memory" node(s).

Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Tested-by: Thor Thayer <thor.thayer@linux.intel.com>
Cc: linux-edac <linux-edac@vger.kernel.org>
Link: http://lkml.kernel.org/r/20170606235500.22772-3-chris.packham@alliedtelesis.co.nz
Signed-off-by: Borislav Petkov <bp@suse.de>

1 files changed, 8 insertions, 16 deletions

diff --git a/drivers/edac/altera_edac.c b/drivers/edac/altera_edac.c
index 122637530b15..db75d4b614f7 100644
--- a/drivers/edac/altera_edac.c
+++ b/drivers/edac/altera_edac.c
@@ -214,24 +214,16 @@ static void altr_sdr_mc_create_debugfs_nodes(struct mem_ctl_info *mci)
 static unsigned long get_total_mem(void)
 {
         struct device_node *np = NULL;
-        const unsigned int *reg, *reg_end;
-        int len, sw, aw;
-        unsigned long start, size, total_mem = 0;
+        struct resource res;
+        int ret;
+        unsigned long total_mem = 0;
 
         for_each_node_by_type(np, "memory") {
-                aw = of_n_addr_cells(np);
-                sw = of_n_size_cells(np);
-                reg = (const unsigned int *)of_get_property(np, "reg", &len);
-                reg_end = reg + (len / sizeof(u32));
-
-                total_mem = 0;
-                do {
-                        start = of_read_number(reg, aw);
-                        reg += aw;
-                        size = of_read_number(reg, sw);
-                        reg += sw;
-                        total_mem += size;
-                } while (reg < reg_end);
+                ret = of_address_to_resource(np, 0, &res);
+                if (ret)
+                        continue;
+
+                total_mem += resource_size(&res);
         }
         edac_dbg(0, "total_mem 0x%lx\n", total_mem);
         return total_mem;