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Enable PL310 power-saving modes and tune the cache ram latencies for imx6.

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This commit is contained in:
Ian Lepore 2014-05-06 14:26:24 +00:00
parent 334b9c79c3
commit 95da66135d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=265447
1 changed files with 13 additions and 0 deletions
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13
sys/arm/freescale/imx/imx6_pl310.c
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@ -44,6 +44,19 @@ __FBSDID("$FreeBSD$");
void
platform_pl310_init(struct pl310_softc *sc)
{
uint32_t reg;
/*
* Enable power saving modes:
* - Dynamic Gating stops the clock when the controller is idle.
* - Standby stops the clock when the cores are in WFI mode.
*/
reg = pl310_read4(sc, PL310_POWER_CTRL);
reg |= POWER_CTRL_ENABLE_GATING | POWER_CTRL_ENABLE_STANDBY;
pl310_write4(sc, PL310_POWER_CTRL, reg);
pl310_set_ram_latency(sc, PL310_TAG_RAM_CTRL, 4, 2, 3);
pl310_set_ram_latency(sc, PL310_DATA_RAM_CTRL, 4, 2, 3);
}
void