ARM: dt: tegra: add bindings of power management configurations for PMC

The PMC mostly controls the entry and exit of the system from different
sleep modes. Different platform or system may have different configurations.
The power management configurations of PMC is represented as some properties.
The system needs to define the properties when the system supports deep sleep
mode (i.e. suspend).

Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Rob Herring <rob.herring@calxeda.com>
Cc: devicetree-discuss@lists.ozlabs.org
Signed-off-by: Joseph Lo <josephl@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>

2 files changed, 91 insertions, 0 deletions

diff --git a/arch/arm/mach-tegra/pmc.c b/arch/arm/mach-tegra/pmc.c
index faa33e8f937d..e896826d7d0f 100644
--- a/arch/arm/mach-tegra/pmc.c
+++ b/arch/arm/mach-tegra/pmc.c
@@ -21,6 +21,8 @@
 #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
@@ -49,6 +51,22 @@ static void __iomem *tegra_pmc_base;
 static bool tegra_pmc_invert_interrupt;
 static struct clk *tegra_pclk;
 
+struct pmc_pm_data {
+	u32 cpu_good_time;	/* CPU power good time in uS */
+	u32 cpu_off_time;	/* CPU power off time in uS */
+	u32 core_osc_time;	/* Core power good osc time in uS */
+	u32 core_pmu_time;	/* Core power good pmu time in uS */
+	u32 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);
@@ -176,6 +194,10 @@ 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);
@@ -186,6 +208,67 @@ static void tegra_pmc_parse_dt(void)
 				     "nvidia,invert-interrupt");
 	tegra_pclk = of_clk_get_by_name(np, "pclk");
 	WARN_ON(IS_ERR(tegra_pclk));
+
+	/* 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 22f16c9dd44d..6bc0fc095269 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,
+};
+
 #ifdef CONFIG_PM_SLEEP
 void set_power_timers(unsigned long us_on, unsigned long us_off);
 #endif