[PATCH V6 4/9] ARM: tegra: pm: add platform suspend support
Joseph Lo
josephl at nvidia.com
Wed Apr 3 07:31:47 EDT 2013
Adding suspend to RAM support for Tegra platform. There are three suspend
mode for Tegra. The difference were below.
* LP2: CPU voltage off
* LP1: CPU voltage off, DRAM in self-refresh
* LP0: CPU + Core voltage off, DRAM in self-refresh
After this patch, the LP2 suspend mode will be supported.
Signed-off-by: Joseph Lo <josephl at nvidia.com>
---
V6:
* no change
V5:
* move tegra_init_suspend() to tegra_init_late()
* remove useless BUG_ON for the polarity of CPU power request
V4:
* add tegra_pm_validate_suspend_mode() to validate the suspend mode config
from DT
* squash the patch below that origianl being introduced after this series
to clean up some PM related code
[2/3] ARM: tegra: refactor the pmc_pm_set function
V3:
* add a protection for only support LP2 suspend mode
V2:
* add the PM_SLEEP protection for "tegra_init_suspend"
* remove "tegra_suspend_{enter/exit}_lp2"
* refactor the "tegra_pmc_pm_set" for non-used parameter
* replace "unsigned long" with "u32" for tegra_pmc_get_cpu_time
---
arch/arm/mach-tegra/common.c | 1 +
arch/arm/mach-tegra/pm.c | 93 +++++++++++++++++++++++++++++++++++++-------
arch/arm/mach-tegra/pm.h | 15 +++++++
arch/arm/mach-tegra/pmc.c | 50 ++++++++++++++++++++++--
arch/arm/mach-tegra/pmc.h | 4 +-
5 files changed, 146 insertions(+), 17 deletions(-)
diff --git a/arch/arm/mach-tegra/common.c b/arch/arm/mach-tegra/common.c
index c84505c..eb1f3c8 100644
--- a/arch/arm/mach-tegra/common.c
+++ b/arch/arm/mach-tegra/common.c
@@ -109,5 +109,6 @@ void __init tegra_init_early(void)
void __init tegra_init_late(void)
{
+ tegra_init_suspend();
tegra_powergate_debugfs_init();
}
diff --git a/arch/arm/mach-tegra/pm.c b/arch/arm/mach-tegra/pm.c
index ef12c0d..14957ff 100644
--- a/arch/arm/mach-tegra/pm.c
+++ b/arch/arm/mach-tegra/pm.c
@@ -22,6 +22,7 @@
#include <linux/cpumask.h>
#include <linux/delay.h>
#include <linux/cpu_pm.h>
+#include <linux/suspend.h>
#include <linux/err.h>
#include <linux/clk/tegra.h>
@@ -38,14 +39,10 @@
#include "fuse.h"
#include "pmc.h"
#include "sleep.h"
-
-#define TEGRA_POWER_CPU_PWRREQ_OE (1 << 16) /* CPU pwr req enable */
-
-#define PMC_CTRL 0x0
+#include "pmc.h"
#ifdef CONFIG_PM_SLEEP
static DEFINE_SPINLOCK(tegra_lp2_lock);
-static void __iomem *pmc = IO_ADDRESS(TEGRA_PMC_BASE);
void (*tegra_tear_down_cpu)(void);
/*
@@ -140,14 +137,7 @@ static int tegra_sleep_cpu(unsigned long v2p)
void tegra_idle_lp2_last(u32 cpu_on_time, u32 cpu_off_time)
{
- u32 mode;
-
- /* Only the last cpu down does the final suspend steps */
- mode = readl(pmc + PMC_CTRL);
- mode |= TEGRA_POWER_CPU_PWRREQ_OE;
- writel(mode, pmc + PMC_CTRL);
-
- set_power_timers(cpu_on_time, cpu_off_time);
+ tegra_pmc_pm_set(TEGRA_SUSPEND_LP2);
cpu_cluster_pm_enter();
suspend_cpu_complex();
@@ -157,4 +147,81 @@ void tegra_idle_lp2_last(u32 cpu_on_time, u32 cpu_off_time)
restore_cpu_complex();
cpu_cluster_pm_exit();
}
+
+enum tegra_suspend_mode tegra_pm_validate_suspend_mode(
+ enum tegra_suspend_mode mode)
+{
+ /* Tegra114 didn't support any suspending mode yet. */
+ if (tegra_chip_id == TEGRA114)
+ return TEGRA_SUSPEND_NONE;
+
+ /*
+ * The Tegra devices only support suspending to LP2 currently.
+ */
+ if (mode > TEGRA_SUSPEND_LP2)
+ return TEGRA_SUSPEND_LP2;
+
+ return mode;
+}
+
+static const char *lp_state[TEGRA_MAX_SUSPEND_MODE] = {
+ [TEGRA_SUSPEND_NONE] = "none",
+ [TEGRA_SUSPEND_LP2] = "LP2",
+ [TEGRA_SUSPEND_LP1] = "LP1",
+ [TEGRA_SUSPEND_LP0] = "LP0",
+};
+
+static int __cpuinit tegra_suspend_enter(suspend_state_t state)
+{
+ enum tegra_suspend_mode mode = tegra_pmc_get_suspend_mode();
+
+ if (WARN_ON(mode < TEGRA_SUSPEND_NONE ||
+ mode >= TEGRA_MAX_SUSPEND_MODE))
+ return -EINVAL;
+
+ pr_info("Entering suspend state %s\n", lp_state[mode]);
+
+ tegra_pmc_pm_set(mode);
+
+ local_fiq_disable();
+
+ suspend_cpu_complex();
+ switch (mode) {
+ case TEGRA_SUSPEND_LP2:
+ tegra_set_cpu_in_lp2(0);
+ break;
+ default:
+ break;
+ }
+
+ cpu_suspend(PHYS_OFFSET - PAGE_OFFSET, &tegra_sleep_cpu);
+
+ switch (mode) {
+ case TEGRA_SUSPEND_LP2:
+ tegra_clear_cpu_in_lp2(0);
+ break;
+ default:
+ break;
+ }
+ restore_cpu_complex();
+
+ local_fiq_enable();
+
+ return 0;
+}
+
+static const struct platform_suspend_ops tegra_suspend_ops = {
+ .valid = suspend_valid_only_mem,
+ .enter = tegra_suspend_enter,
+};
+
+void __init tegra_init_suspend(void)
+{
+ if (tegra_pmc_get_suspend_mode() == TEGRA_SUSPEND_NONE)
+ return;
+
+ tegra_pmc_suspend_init();
+
+ suspend_set_ops(&tegra_suspend_ops);
+}
#endif
diff --git a/arch/arm/mach-tegra/pm.h b/arch/arm/mach-tegra/pm.h
index 787335c..73a45f1 100644
--- a/arch/arm/mach-tegra/pm.h
+++ b/arch/arm/mach-tegra/pm.h
@@ -21,6 +21,8 @@
#ifndef _MACH_TEGRA_PM_H_
#define _MACH_TEGRA_PM_H_
+#include "pmc.h"
+
extern unsigned long l2x0_saved_regs_addr;
void save_cpu_arch_register(void);
@@ -32,4 +34,17 @@ bool tegra_set_cpu_in_lp2(int phy_cpu_id);
void tegra_idle_lp2_last(u32 cpu_on_time, u32 cpu_off_time);
extern void (*tegra_tear_down_cpu)(void);
+#ifdef CONFIG_PM_SLEEP
+enum tegra_suspend_mode tegra_pm_validate_suspend_mode(
+ enum tegra_suspend_mode mode);
+void tegra_init_suspend(void);
+#else
+enum tegra_suspend_mode tegra_pm_validate_suspend_mode(
+ enum tegra_suspend_mode mode)
+{
+ return TEGRA_SUSPEND_NONE;
+}
+static inline void tegra_init_suspend(void) {}
+#endif
+
#endif /* _MACH_TEGRA_PM_H_ */
diff --git a/arch/arm/mach-tegra/pmc.c b/arch/arm/mach-tegra/pmc.c
index e896826..32360e5 100644
--- a/arch/arm/mach-tegra/pmc.c
+++ b/arch/arm/mach-tegra/pmc.c
@@ -21,7 +21,14 @@
#include <linux/of.h>
#include <linux/of_address.h>
+#include "fuse.h"
+#include "pm.h"
#include "pmc.h"
+#include "sleep.h"
+
+#define TEGRA_POWER_EFFECT_LP0 (1 << 14) /* LP0 when CPU pwr gated */
+#define TEGRA_POWER_CPU_PWRREQ_POLARITY (1 << 15) /* CPU pwr req polarity */
+#define TEGRA_POWER_CPU_PWRREQ_OE (1 << 16) /* CPU pwr req enable */
#define PMC_CTRL 0x0
#define PMC_CTRL_INTR_LOW (1 << 17)
@@ -157,14 +164,12 @@ int tegra_pmc_cpu_remove_clamping(int cpuid)
}
#ifdef CONFIG_PM_SLEEP
-void set_power_timers(unsigned long us_on, unsigned long us_off)
+static void set_power_timers(u32 us_on, u32 us_off, unsigned long rate)
{
unsigned long long ticks;
unsigned long long pclk;
- unsigned long rate;
static unsigned long tegra_last_pclk;
- rate = clk_get_rate(tegra_pclk);
if (WARN_ON_ONCE(rate <= 0))
pclk = 100000000;
else
@@ -182,6 +187,44 @@ void set_power_timers(unsigned long us_on, unsigned long us_off)
}
tegra_last_pclk = pclk;
}
+
+enum tegra_suspend_mode tegra_pmc_get_suspend_mode(void)
+{
+ return pmc_pm_data.suspend_mode;
+}
+
+void tegra_pmc_pm_set(enum tegra_suspend_mode mode)
+{
+ u32 reg;
+ unsigned long rate = 0;
+
+ reg = tegra_pmc_readl(PMC_CTRL);
+ reg |= TEGRA_POWER_CPU_PWRREQ_OE;
+ reg &= ~TEGRA_POWER_EFFECT_LP0;
+
+ switch (mode) {
+ case TEGRA_SUSPEND_LP2:
+ rate = clk_get_rate(tegra_pclk);
+ break;
+ default:
+ break;
+ }
+
+ set_power_timers(pmc_pm_data.cpu_good_time, pmc_pm_data.cpu_off_time,
+ rate);
+
+ tegra_pmc_writel(reg, PMC_CTRL);
+}
+
+void tegra_pmc_suspend_init(void)
+{
+ u32 reg;
+
+ /* Always enable CPU power request */
+ reg = tegra_pmc_readl(PMC_CTRL);
+ reg |= TEGRA_POWER_CPU_PWRREQ_OE;
+ tegra_pmc_writel(reg, PMC_CTRL);
+}
#endif
static const struct of_device_id matches[] __initconst = {
@@ -228,6 +271,7 @@ static void tegra_pmc_parse_dt(void)
break;
}
}
+ suspend_mode = tegra_pm_validate_suspend_mode(suspend_mode);
if (of_property_read_u32(np, "nvidia,cpu-pwr-good-time", &prop))
suspend_mode = TEGRA_SUSPEND_NONE;
diff --git a/arch/arm/mach-tegra/pmc.h b/arch/arm/mach-tegra/pmc.h
index 6bc0fc09..e1c2df2 100644
--- a/arch/arm/mach-tegra/pmc.h
+++ b/arch/arm/mach-tegra/pmc.h
@@ -27,7 +27,9 @@ enum tegra_suspend_mode {
};
#ifdef CONFIG_PM_SLEEP
-void set_power_timers(unsigned long us_on, unsigned long us_off);
+enum tegra_suspend_mode tegra_pmc_get_suspend_mode(void);
+void tegra_pmc_pm_set(enum tegra_suspend_mode mode);
+void tegra_pmc_suspend_init(void);
#endif
bool tegra_pmc_cpu_is_powered(int cpuid);
--
1.8.2
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