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ARM: mvebu: Allow to power down L2 cache controller in idle mode

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This commit adds a function which adjusts the PMSU configuration to
automatically power down the L2 and coherency fabric when we enter a
certain idle state.

This feature is part of the Power Management Service Unit of the
Armada 370 and Armada XP SoCs.

Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Link: https://lkml.kernel.org/r/1397488214-20685-8-git-send-email-gregory.clement@free-electrons.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
This commit is contained in:
Gregory CLEMENT 2014-04-14 17:10:10 +02:00 committed by Jason Cooper
parent 1a6bfbc339
commit f713c7e742
1 changed files with 19 additions and 1 deletions
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20
arch/arm/mach-mvebu/pmsu.c
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@ -33,7 +33,12 @@ static void __iomem *pmsu_mp_base;
#define PMSU_BASE_OFFSET 0x100
#define PMSU_REG_SIZE 0x1000
#define PMSU_BOOT_ADDR_REDIRECT_OFFSET(cpu) ((cpu * 0x100) + 0x124)
/* PMSU MP registers */
#define PMSU_BOOT_ADDR_REDIRECT_OFFSET(cpu) ((cpu * 0x100) + 0x124)
/* PMSU fabric registers */
#define L2C_NFABRIC_PM_CTL 0x4
#define L2C_NFABRIC_PM_CTL_PWR_DOWN BIT(20)
static struct of_device_id of_pmsu_table[] = {
{ .compatible = "marvell,armada-370-pmsu", },
@ -92,4 +97,17 @@ static int __init armada_370_xp_pmsu_init(void)
return ret;
}
static void armada_370_xp_pmsu_enable_l2_powerdown_onidle(void)
{
u32 reg;
if (pmsu_mp_base == NULL)
return;
/* Enable L2 & Fabric powerdown in Deep-Idle mode - Fabric */
reg = readl(pmsu_mp_base + L2C_NFABRIC_PM_CTL);
reg |= L2C_NFABRIC_PM_CTL_PWR_DOWN;
writel(reg, pmsu_mp_base + L2C_NFABRIC_PM_CTL);
}
early_initcall(armada_370_xp_pmsu_init);