ARM: 8391/1: l2c: add options to overwrite prefetching behavior

These options make it possible to overwrites the data and instruction
prefetching behavior of the arm pl310 cache controller.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 20 insertions, 0 deletions

diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
index 90599f60ff02..71b3d3309024 100644
--- a/arch/arm/mm/cache-l2x0.c
+++ b/arch/arm/mm/cache-l2x0.c
@@ -1221,6 +1221,26 @@ static void __init l2c310_of_parse(const struct device_node *np,
                 pr_err("L2C-310 OF arm,prefetch-offset property value is missing\n");
         }
 
+        ret = of_property_read_u32(np, "prefetch-data", &val);
+        if (ret == 0) {
+                if (val)
+                        prefetch |= L310_PREFETCH_CTRL_DATA_PREFETCH;
+                else
+                        prefetch &= ~L310_PREFETCH_CTRL_DATA_PREFETCH;
+        } else if (ret != -EINVAL) {
+                pr_err("L2C-310 OF prefetch-data property value is missing\n");
+        }
+
+        ret = of_property_read_u32(np, "prefetch-instr", &val);
+        if (ret == 0) {
+                if (val)
+                        prefetch |= L310_PREFETCH_CTRL_INSTR_PREFETCH;
+                else
+                        prefetch &= ~L310_PREFETCH_CTRL_INSTR_PREFETCH;
+        } else if (ret != -EINVAL) {
+                pr_err("L2C-310 OF prefetch-instr property value is missing\n");
+        }
+
         l2x0_saved_regs.prefetch_ctrl = prefetch;
 }