From ec3bd0e68a679a7af2c46af1ddc9af8b534a8b0e Mon Sep 17 00:00:00 2001 From: Hauke Mehrtens 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 Acked-by: Florian Fainelli Signed-off-by: Russell King --- 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; }