[PATCH v4 08/13] ARM: mvebu: Allow to power down L2 cache controller in idle mode
From: Gregory CLEMENT <hidden>
Date: 2014-02-13 17:33:31
Also in:
linux-pm
Subsystem:
arm port, arm/marvell kirkwood and armada 370, 375, 38x, 39x, xp, 3700, 7k/8k, cn9130 soc support, the rest · Maintainers:
Russell King, Andrew Lunn, Gregory Clement, Sebastian Hesselbarth, Linus Torvalds
This commit adds an 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 <redacted> --- arch/arm/mach-mvebu/pmsu.c | 24 ++++++++++++++++++++++-- arch/arm/mach-mvebu/pmsu.h | 1 + 2 files changed, 23 insertions(+), 2 deletions(-)
diff --git a/arch/arm/mach-mvebu/pmsu.c b/arch/arm/mach-mvebu/pmsu.c
index aa5ef7439d0f..36d946d53f54 100644
--- a/arch/arm/mach-mvebu/pmsu.c
+++ b/arch/arm/mach-mvebu/pmsu.c@@ -28,8 +28,15 @@ static void __iomem *pmsu_mp_base; static void __iomem *pmsu_reset_base; static void __iomem *pmsu_fabric_base; -#define PMSU_BOOT_ADDR_REDIRECT_OFFSET(cpu) ((cpu * 0x100) + 0x24) -#define PMSU_RESET_CTL_OFFSET(cpu) (cpu * 0x8) +/* PMSU MP registers */ +#define PMSU_BOOT_ADDR_REDIRECT_OFFSET(cpu) ((cpu * 0x100) + 0x24) + +/* PMSU reset registers */ +#define PMSU_RESET_CTL_OFFSET(cpu) (cpu * 0x8) + +/* 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-xp-pmsu"},
@@ -79,4 +86,17 @@ static int __init armada_370_xp_pmsu_init(void) return 0; } +void armada_370_xp_pmsu_enable_l2_powerdown_onidle(void) +{ + u32 reg; + + if (pmsu_fabric_base == NULL) + return; + + /* Enable L2 & Fabric powerdown in Deep-Idle mode - Fabric */ + reg = readl(pmsu_fabric_base + L2C_NFABRIC_PM_CTL); + reg |= L2C_NFABRIC_PM_CTL_PWR_DOWN; + writel(reg, pmsu_fabric_base + L2C_NFABRIC_PM_CTL); +} + early_initcall(armada_370_xp_pmsu_init);
diff --git a/arch/arm/mach-mvebu/pmsu.h b/arch/arm/mach-mvebu/pmsu.h
index 07a737c6b95d..054cdd8b0ece 100644
--- a/arch/arm/mach-mvebu/pmsu.h
+++ b/arch/arm/mach-mvebu/pmsu.h@@ -12,5 +12,6 @@ #define __MACH_MVEBU_PMSU_H int armada_xp_boot_cpu(unsigned int cpu_id, void *phys_addr); +void armada_370_xp_pmsu_enable_l2_powerdown_onidle(void); #endif /* __MACH_370_XP_PMSU_H */
--
1.8.1.2