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ARM: tegra: shut off the CPU rail when the last CPU in suspend 

When the last CPU core in suspend, the CPU power rail can be turned off
by setting flags to flow controller. Then the flow controller will inform
PMC to turn off the CPU rail when the last CPU goes into suspend.

Signed-off-by: Joseph Lo <josephl@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
This commit is contained in:
Joseph Lo 2013-07-03 17:50:41 +08:00 committed by Stephen Warren
parent ccea4bc654
commit 3f1be81eef
2 changed files with 20 additions and 1 deletions
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5
arch/arm/mach-tegra/flowctrl.h
View File

@ -35,6 +35,11 @@
#define FLOW_CTRL_CPU0_CSR 0x8
#define FLOW_CTRL_CSR_INTR_FLAG (1 << 15)
#define FLOW_CTRL_CSR_EVENT_FLAG (1 << 14)
#define FLOW_CTRL_CSR_ENABLE_EXT_CRAIL (1 << 13)
#define FLOW_CTRL_CSR_ENABLE_EXT_NCPU (1 << 12)
#define FLOW_CTRL_CSR_ENABLE_EXT_MASK ( \
FLOW_CTRL_CSR_ENABLE_EXT_NCPU | \
FLOW_CTRL_CSR_ENABLE_EXT_CRAIL)
#define FLOW_CTRL_CSR_ENABLE (1 << 0)
#define FLOW_CTRL_HALT_CPU1_EVENTS 0x14
#define FLOW_CTRL_CPU1_CSR 0x18

16
arch/arm/mach-tegra/pmc.c
View File

@ -21,6 +21,7 @@
#include <linux/of.h>
#include <linux/of_address.h>
#include "flowctrl.h"
#include "fuse.h"
#include "pm.h"
#include "pmc.h"
@ -195,13 +196,26 @@ enum tegra_suspend_mode tegra_pmc_get_suspend_mode(void)
void tegra_pmc_pm_set(enum tegra_suspend_mode mode)
{
u32 reg;
u32 reg, csr_reg;
unsigned long rate = 0;
reg = tegra_pmc_readl(PMC_CTRL);
reg |= TEGRA_POWER_CPU_PWRREQ_OE;
reg &= ~TEGRA_POWER_EFFECT_LP0;
switch (tegra_chip_id) {
case TEGRA20:
case TEGRA30:
break;
default:
/* Turn off CRAIL */
csr_reg = flowctrl_read_cpu_csr(0);
csr_reg &= ~FLOW_CTRL_CSR_ENABLE_EXT_MASK;
csr_reg |= FLOW_CTRL_CSR_ENABLE_EXT_CRAIL;
flowctrl_write_cpu_csr(0, csr_reg);
break;
}
switch (mode) {
case TEGRA_SUSPEND_LP2:
rate = clk_get_rate(tegra_pclk);