If the system supports deep sleep mode (i.e. suspend), it should have
the power management configuration for PMC in the DT under the sub-node
of PMC. Different system may have different configurations, it should
be parsed from DT.
Signed-off-by: Joseph Lo <josephl@xxxxxxxxxx>
---
arch/arm/mach-tegra/pmc.c | 83 +++++++++++++++++++++++++++++++++++++++++++++++
arch/arm/mach-tegra/pmc.h | 8 +++++
2 files changed, 91 insertions(+)
diff --git a/arch/arm/mach-tegra/pmc.c b/arch/arm/mach-tegra/pmc.c
index b30e921..f30c660 100644
--- a/arch/arm/mach-tegra/pmc.c
+++ b/arch/arm/mach-tegra/pmc.c
@@ -20,6 +20,8 @@
#include <linux/of.h>
#include <linux/of_address.h>
+#include "pmc.h"
+
#define PMC_CTRL 0x0
#define PMC_CTRL_INTR_LOW (1 << 17)
#define PMC_PWRGATE_TOGGLE 0x30
@@ -44,6 +46,22 @@ static DEFINE_SPINLOCK(tegra_powergate_lock);
static void __iomem *tegra_pmc_base;
static bool tegra_pmc_invert_interrupt;
+struct pmc_pm_data {
+ unsigned long cpu_good_time; /* CPU power good time in uS */
+ unsigned long cpu_off_time; /* CPU power off time in uS */
+ unsigned long core_osc_time; /* Core power good osc time in uS */
+ unsigned long core_pmu_time; /* Core power good pmu time in uS */
+ unsigned long core_off_time; /* Core power off time in uS */
+ bool corereq_high; /* Core power request active-high */
+ bool sysclkreq_high; /* System clock request active-high */
+ bool combined_req; /* Combined pwr req for CPU & Core */
+ bool cpu_pwr_good_en; /* CPU power good signal is enabled */
+ u32 lp0_vec_phy_addr; /* The phy addr of LP0 warm boot code */
+ u32 lp0_vec_size; /* The size of LP0 warm boot code */
+ enum tegra_suspend_mode suspend_mode;
+};
+static struct pmc_pm_data pmc_pm_data;
+
static inline u32 tegra_pmc_readl(u32 reg)
{
return readl(tegra_pmc_base + reg);
@@ -143,6 +161,10 @@ static const struct of_device_id matches[] __initconst = {
static void tegra_pmc_parse_dt(void)
{
struct device_node *np;
+ u32 prop;
+ enum tegra_suspend_mode suspend_mode;
+ u32 core_good_time[2] = {0, 0};
+ u32 lp0_vec[2] = {0, 0};
np = of_find_matching_node(NULL, matches);
BUG_ON(!np);
@@ -151,6 +173,67 @@ static void tegra_pmc_parse_dt(void)
tegra_pmc_invert_interrupt = of_property_read_bool(np,
"nvidia,invert-interrupt");
+
+ /* Grabbing the power management configurations */
+ if (of_property_read_u32(np, "nvidia,suspend-mode", &prop)) {
+ suspend_mode = TEGRA_SUSPEND_NONE;
+ } else {
+ switch (prop) {
+ case 0:
+ suspend_mode = TEGRA_SUSPEND_LP0;
+ break;
+ case 1:
+ suspend_mode = TEGRA_SUSPEND_LP1;
+ break;
+ case 2:
+ suspend_mode = TEGRA_SUSPEND_LP2;
+ break;
+ default:
+ suspend_mode = TEGRA_SUSPEND_NONE;
+ break;
+ }
+ }
+
+ if (of_property_read_u32(np, "nvidia,cpu-pwr-good-time", &prop))
+ suspend_mode = TEGRA_SUSPEND_NONE;
+ pmc_pm_data.cpu_good_time = prop;
+
+ if (of_property_read_u32(np, "nvidia,cpu-pwr-off-time", &prop))
+ suspend_mode = TEGRA_SUSPEND_NONE;
+ pmc_pm_data.cpu_off_time = prop;
+
+ if (of_property_read_u32_array(np, "nvidia,core-pwr-good-time",
+ core_good_time, ARRAY_SIZE(core_good_time)))
+ suspend_mode = TEGRA_SUSPEND_NONE;
+ pmc_pm_data.core_osc_time = core_good_time[0];
+ pmc_pm_data.core_pmu_time = core_good_time[1];
+
+ if (of_property_read_u32(np, "nvidia,core-pwr-off-time",
+ &prop))
+ suspend_mode = TEGRA_SUSPEND_NONE;
+ pmc_pm_data.core_off_time = prop;
+
+ pmc_pm_data.corereq_high = of_property_read_bool(np,
+ "nvidia,core-power-req-active-high");
+
+ pmc_pm_data.sysclkreq_high = of_property_read_bool(np,
+ "nvidia,sys-clock-req-active-high");
+
+ pmc_pm_data.combined_req = of_property_read_bool(np,
+ "nvidia,combined-power-req");
+
+ pmc_pm_data.cpu_pwr_good_en = of_property_read_bool(np,
+ "nvidia,cpu-pwr-good-en");
+
+ if (of_property_read_u32_array(np, "nvidia,lp0-vec", lp0_vec,
+ ARRAY_SIZE(lp0_vec)))
+ if (suspend_mode == TEGRA_SUSPEND_LP0)
+ suspend_mode = TEGRA_SUSPEND_LP1;
+
+ pmc_pm_data.lp0_vec_phy_addr = lp0_vec[0];
+ pmc_pm_data.lp0_vec_size = lp0_vec[1];
+
+ pmc_pm_data.suspend_mode = suspend_mode;
}
void __init tegra_pmc_init(void)
diff --git a/arch/arm/mach-tegra/pmc.h b/arch/arm/mach-tegra/pmc.h
index 7d44710..1c4b4de 100644
--- a/arch/arm/mach-tegra/pmc.h
+++ b/arch/arm/mach-tegra/pmc.h
@@ -18,6 +18,14 @@
#ifndef __MACH_TEGRA_PMC_H
#define __MACH_TEGRA_PMC_H
+enum tegra_suspend_mode {
+ TEGRA_SUSPEND_NONE = 0,
+ TEGRA_SUSPEND_LP2, /* CPU voltage off */
+ TEGRA_SUSPEND_LP1, /* CPU voltage off, DRAM self-refresh */
+ TEGRA_SUSPEND_LP0, /* CPU + core voltage off, DRAM self-refresh */
+ TEGRA_MAX_SUSPEND_MODE,
+};
+
bool tegra_pmc_cpu_is_powered(int cpuid);
int tegra_pmc_cpu_power_on(int cpuid);
int tegra_pmc_cpu_remove_clamping(int cpuid);
--
1.8.1.1
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