iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

ARM: mvebu: make the snoop disabling optional in mvebu_v7_pmsu_idle_prepare()

Browse Source 
On some mvebu v7 SoCs (the ones using a Cortex-A9 core and not a PJ4B
core), the snoop disabling feature does not exist as the hardware
coherency is handled in a different way. Therefore, in preparation to
the introduction of the cpuidle support for those SoCs, this commit
modifies the mvebu_v7_psmu_idle_prepare() function to take several
flags, which allow to decide whether snooping should be disabled, and
whether we should use the deep idle mode or not.

Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Link: https://lkml.kernel.org/r/1406120453-29291-9-git-send-email-thomas.petazzoni@free-electrons.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
This commit is contained in:
Gregory CLEMENT 2014-07-23 15:00:45 +02:00 committed by Jason Cooper
parent 752a993776
commit 5da964e0fa
1 changed files with 19 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
arch/arm/mach-mvebu/pmsu.c
View File

@ -191,8 +191,14 @@ static void mvebu_v7_pmsu_enable_l2_powerdown_onidle(void)
writel(reg, pmsu_mp_base + L2C_NFABRIC_PM_CTL);
}
enum pmsu_idle_prepare_flags {
PMSU_PREPARE_NORMAL = 0,
PMSU_PREPARE_DEEP_IDLE = BIT(0),
PMSU_PREPARE_SNOOP_DISABLE = BIT(1),
};
/* No locking is needed because we only access per-CPU registers */
static int mvebu_v7_pmsu_idle_prepare(bool deepidle)
static int mvebu_v7_pmsu_idle_prepare(unsigned long flags)
{
unsigned int hw_cpu = cpu_logical_map(smp_processor_id());
u32 reg;
@ -216,26 +222,32 @@ static int mvebu_v7_pmsu_idle_prepare(bool deepidle)
reg = readl(pmsu_mp_base + PMSU_CONTROL_AND_CONFIG(hw_cpu));
/* ask HW to power down the L2 Cache if needed */
if (deepidle)
if (flags & PMSU_PREPARE_DEEP_IDLE)
reg |= PMSU_CONTROL_AND_CONFIG_L2_PWDDN;
/* request power down */
reg |= PMSU_CONTROL_AND_CONFIG_PWDDN_REQ;
writel(reg, pmsu_mp_base + PMSU_CONTROL_AND_CONFIG(hw_cpu));
/* Disable snoop disable by HW - SW is taking care of it */
reg = readl(pmsu_mp_base + PMSU_CPU_POWER_DOWN_CONTROL(hw_cpu));
reg |= PMSU_CPU_POWER_DOWN_DIS_SNP_Q_SKIP;
writel(reg, pmsu_mp_base + PMSU_CPU_POWER_DOWN_CONTROL(hw_cpu));
if (flags & PMSU_PREPARE_SNOOP_DISABLE) {
/* Disable snoop disable by HW - SW is taking care of it */
reg = readl(pmsu_mp_base + PMSU_CPU_POWER_DOWN_CONTROL(hw_cpu));
reg |= PMSU_CPU_POWER_DOWN_DIS_SNP_Q_SKIP;
writel(reg, pmsu_mp_base + PMSU_CPU_POWER_DOWN_CONTROL(hw_cpu));
}
return 0;
}
int armada_370_xp_pmsu_idle_enter(unsigned long deepidle)
{
unsigned long flags = PMSU_PREPARE_SNOOP_DISABLE;
int ret;
ret = mvebu_v7_pmsu_idle_prepare(deepidle);
if (deepidle)
flags |= PMSU_PREPARE_DEEP_IDLE;
ret = mvebu_v7_pmsu_idle_prepare(flags);
if (ret)
return ret;