On 29/05/15 16:19, Hauke Mehrtens wrote:
> 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>
Acked-by: Florian Fainelli <f.fainelli@xxxxxxxxx>
> ---
> changes since
> v3:
> * remove arm prefix
> * improve documentation
> v2: only set prefetch
> v1: set prefetch and aux
> Documentation/devicetree/bindings/arm/l2cc.txt | 5 +++++
> arch/arm/mm/cache-l2x0.c | 20 ++++++++++++++++++++
> 2 files changed, 25 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/arm/l2cc.txt b/Documentation/devicetree/bindings/arm/l2cc.txt
> index 0dbabe9..2251dcc 100644
> --- 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:
>
> diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
> index e309c8f..2570f83 100644
> --- a/arch/arm/mm/cache-l2x0.c
> +++ b/arch/arm/mm/cache-l2x0.c
> @@ -1199,6 +1199,26 @@ 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;
> }
>
>
--
Florian
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