61 lines
2.1 KiB
Diff
61 lines
2.1 KiB
Diff
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From ec3bd0e68a679a7af2c46af1ddc9af8b534a8b0e Mon Sep 17 00:00:00 2001
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From: Hauke Mehrtens <hauke@hauke-m.de>
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Date: Wed, 10 Jun 2015 20:23:24 +0100
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Subject: [PATCH] ARM: 8391/1: l2c: add options to overwrite prefetching
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behavior
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These options make it possible to overwrites the data and instruction
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prefetching behavior of the arm pl310 cache controller.
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Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
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Acked-by: Florian Fainelli <f.fainelli@gmail.com>
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Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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---
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Documentation/devicetree/bindings/arm/l2cc.txt | 5 +++++
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arch/arm/mm/cache-l2x0.c | 20 ++++++++++++++++++++
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2 files changed, 25 insertions(+)
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--- a/Documentation/devicetree/bindings/arm/l2cc.txt
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+++ b/Documentation/devicetree/bindings/arm/l2cc.txt
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@@ -67,6 +67,11 @@ Optional properties:
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disable if zero.
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- arm,prefetch-offset : Override prefetch offset value. Valid values are
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0-7, 15, 23, and 31.
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+- prefetch-data : Data prefetch. Value: <0> (forcibly disable), <1>
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+ (forcibly enable), property absent (retain settings set by firmware)
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+- prefetch-instr : Instruction prefetch. Value: <0> (forcibly disable),
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+ <1> (forcibly enable), property absent (retain settings set by
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+ firmware)
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Example:
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--- a/arch/arm/mm/cache-l2x0.c
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+++ b/arch/arm/mm/cache-l2x0.c
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@@ -1221,6 +1221,26 @@ static void __init l2c310_of_parse(const
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pr_err("L2C-310 OF arm,prefetch-offset property value is missing\n");
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}
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+ ret = of_property_read_u32(np, "prefetch-data", &val);
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+ if (ret == 0) {
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+ if (val)
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+ prefetch |= L310_PREFETCH_CTRL_DATA_PREFETCH;
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+ else
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+ prefetch &= ~L310_PREFETCH_CTRL_DATA_PREFETCH;
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+ } else if (ret != -EINVAL) {
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+ pr_err("L2C-310 OF prefetch-data property value is missing\n");
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+ }
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+
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+ ret = of_property_read_u32(np, "prefetch-instr", &val);
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+ if (ret == 0) {
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+ if (val)
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+ prefetch |= L310_PREFETCH_CTRL_INSTR_PREFETCH;
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+ else
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+ prefetch &= ~L310_PREFETCH_CTRL_INSTR_PREFETCH;
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+ } else if (ret != -EINVAL) {
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+ pr_err("L2C-310 OF prefetch-instr property value is missing\n");
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+ }
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+
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l2x0_saved_regs.prefetch_ctrl = prefetch;
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}
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