linux-kernel - [PATCH v2 2/3] EDAC: altera: simplify calculation of total memory

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Date:   Wed,  7 Jun 2017 11:54:59 +1200
From:   Chris Packham <chris.packham@...iedtelesis.co.nz>
To:     bp@...en8.de, linux-edac@...r.kernel.org
Cc:     mchehab@...nel.org, mpe@...erman.id.au,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Chris Packham <chris.packham@...iedtelesis.co.nz>,
        Thor Thayer <thor.thayer@...ux.intel.com>
Subject: [PATCH v2 2/3] 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@...iedtelesis.co.nz>
---
Changes in v2:
- New

 drivers/edac/altera_edac.c | 24 ++++++++----------------
 1 file changed, 8 insertions(+), 16 deletions(-)

diff --git a/drivers/edac/altera_edac.c b/drivers/edac/altera_edac.c
index 7717b094fabb..f8b623352627 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;
-- 
2.13.0