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@xxxxxxxxxx>
---
Documentation/devicetree/bindings/arm/l2cc.txt | 4 ++++
arch/arm/mm/cache-l2x0.c | 10 ++++++++++
2 files changed, 14 insertions(+)
diff --git a/Documentation/devicetree/bindings/arm/l2cc.txt b/Documentation/devicetree/bindings/arm/l2cc.txt
index 0dbabe9..528821a 100644
--- a/Documentation/devicetree/bindings/arm/l2cc.txt
+++ b/Documentation/devicetree/bindings/arm/l2cc.txt
@@ -67,6 +67,10 @@ Optional properties:
disable if zero.
- arm,prefetch-offset : Override prefetch offset value. Valid values are
0-7, 15, 23, and 31.
+- arm,prefetch-data : Enable data prefetch. Enabling prefetching
+ can improve performance.
+- arm,prefetch-instr : Enable instruction prefetch. Enabling prefetching
+ can improve performance.
Example:
diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
index e309c8f..f919548 100644
--- a/arch/arm/mm/cache-l2x0.c
+++ b/arch/arm/mm/cache-l2x0.c
@@ -1149,6 +1149,16 @@ static void __init l2c310_of_parse(const struct device_node *np,
}
}
+ if (of_property_read_bool(np, "arm,prefetch-data")) {
+ *aux_val |= L310_AUX_CTRL_DATA_PREFETCH;
+ *aux_mask &= ~L310_AUX_CTRL_DATA_PREFETCH;
+ }
+
+ if (of_property_read_bool(np, "arm,prefetch-instr")) {
+ *aux_val |= L310_AUX_CTRL_INSTR_PREFETCH;
+ *aux_mask &= ~L310_AUX_CTRL_INSTR_PREFETCH;
+ }
+
prefetch = l2x0_saved_regs.prefetch_ctrl;
ret = of_property_read_u32(np, "arm,double-linefill", &val);
--
2.1.4
--
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