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- From ec3bd0e68a679a7af2c46af1ddc9af8b534a8b0e Mon Sep 17 00:00:00 2001
- From: Hauke Mehrtens <hauke@hauke-m.de>
- Date: Wed, 10 Jun 2015 20:23:24 +0100
- Subject: [PATCH] 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>
- ---
- Documentation/devicetree/bindings/arm/l2cc.txt | 5 +++++
- arch/arm/mm/cache-l2x0.c | 20 ++++++++++++++++++++
- 2 files changed, 25 insertions(+)
- --- a/Documentation/devicetree/bindings/arm/l2cc.txt
- +++ b/Documentation/devicetree/bindings/arm/l2cc.txt
- @@ -67,6 +67,11 @@ Optional properties:
- disable if zero.
- - arm,prefetch-offset : Override prefetch offset value. Valid values are
- 0-7, 15, 23, and 31.
- +- prefetch-data : Data prefetch. Value: <0> (forcibly disable), <1>
- + (forcibly enable), property absent (retain settings set by firmware)
- +- prefetch-instr : Instruction prefetch. Value: <0> (forcibly disable),
- + <1> (forcibly enable), property absent (retain settings set by
- + firmware)
-
- Example:
-
- --- 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
- 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;
- }
-
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