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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>
hifive-unleashed-5.1
Hauke Mehrtens 2015-06-10 20:23:24 +01:00 committed by Russell King
parent 55af8a9164
commit ec3bd0e68a
2 changed files with 25 additions and 0 deletions
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5
Documentation/devicetree/bindings/arm/l2cc.txt
View File

@ -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:

20
arch/arm/mm/cache-l2x0.c
View File

@ -1221,6 +1221,26 @@ 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;
}