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 <[email protected]> --- 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 | 71 ++++++++++++++++++++++++++++++++++++++++++++ arch/arm/mach-tegra/pm.h | 6 ++++ arch/arm/mach-tegra/pmc.c | 53 +++++++++++++++++++++++++++++++++ arch/arm/mach-tegra/pmc.h | 9 ++++++ 5 files changed, 140 insertions(+) diff --git a/arch/arm/mach-tegra/common.c b/arch/arm/mach-tegra/common.c index bc7268a..fd67efa 100644 --- a/arch/arm/mach-tegra/common.c +++ b/arch/arm/mach-tegra/common.c @@ -65,6 +65,7 @@ void __init tegra_dt_init_irq(void) tegra_init_irq(); irqchip_init(); tegra_legacy_irq_syscore_init(); + tegra_init_suspend(); } #endif diff --git a/arch/arm/mach-tegra/pm.c b/arch/arm/mach-tegra/pm.c index 0494f73..915e13b 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/clk.h> #include <linux/err.h> #include <linux/clk/tegra.h> @@ -38,6 +39,7 @@ #include "flowctrl.h" #include "fuse.h" #include "sleep.h" +#include "pmc.h" #define TEGRA_POWER_CPU_PWRREQ_OE (1 << 16) /* CPU pwr req enable */ @@ -197,4 +199,73 @@ void tegra_idle_lp2_last(u32 cpu_on_time, u32 cpu_off_time) restore_cpu_complex(); cpu_cluster_pm_exit(); } + +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(); + set_power_timers(tegra_pmc_get_cpu_good_time(), + tegra_pmc_get_cpu_off_time()); + + 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) +{ + enum tegra_suspend_mode mode = tegra_pmc_get_suspend_mode(); + + if (mode == TEGRA_SUSPEND_NONE) + return; + + tegra_pmc_suspend_init(); + + /* We only support LP2 suspend mode right now. */ + if (mode > TEGRA_SUSPEND_LP2) + tegra_pmc_set_suspend_mode(TEGRA_SUSPEND_LP2); + + 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..e7cbfeb 100644 --- a/arch/arm/mach-tegra/pm.h +++ b/arch/arm/mach-tegra/pm.h @@ -32,4 +32,10 @@ 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 +void tegra_init_suspend(void); +#else +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 d331f87..f0c5435 100644 --- a/arch/arm/mach-tegra/pmc.c +++ b/arch/arm/mach-tegra/pmc.c @@ -20,7 +20,13 @@ #include <linux/of.h> #include <linux/of_address.h> +#include "fuse.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) @@ -151,6 +157,53 @@ int tegra_pmc_cpu_remove_clamping(int cpuid) return tegra_pmc_powergate_remove_clamping(id); } +#ifdef CONFIG_PM_SLEEP +enum tegra_suspend_mode tegra_pmc_get_suspend_mode(void) +{ + return pmc_pm_data.suspend_mode; +} + +void tegra_pmc_set_suspend_mode(enum tegra_suspend_mode mode) +{ + if (mode < TEGRA_SUSPEND_NONE || mode >= TEGRA_MAX_SUSPEND_MODE) + return; + + pmc_pm_data.suspend_mode = mode; +} + +u32 tegra_pmc_get_cpu_good_time(void) +{ + return pmc_pm_data.cpu_good_time; +} + +u32 tegra_pmc_get_cpu_off_time(void) +{ + return pmc_pm_data.cpu_off_time; +} + +void tegra_pmc_pm_set(void) +{ + u32 reg; + + reg = tegra_pmc_readl(PMC_CTRL); + reg |= TEGRA_POWER_CPU_PWRREQ_OE; + reg &= ~TEGRA_POWER_EFFECT_LP0; + + tegra_pmc_writel(reg, PMC_CTRL); +} + +void tegra_pmc_suspend_init(void) +{ + u32 reg; + + /* Always enable CPU power request; just normal polarity is supported */ + reg = tegra_pmc_readl(PMC_CTRL); + BUG_ON(reg & TEGRA_POWER_CPU_PWRREQ_POLARITY); + reg |= TEGRA_POWER_CPU_PWRREQ_OE; + tegra_pmc_writel(reg, PMC_CTRL); +} +#endif + static const struct of_device_id matches[] __initconst = { { .compatible = "nvidia,tegra114-pmc" }, { .compatible = "nvidia,tegra30-pmc" }, diff --git a/arch/arm/mach-tegra/pmc.h b/arch/arm/mach-tegra/pmc.h index 1c4b4de..72b2cee 100644 --- a/arch/arm/mach-tegra/pmc.h +++ b/arch/arm/mach-tegra/pmc.h @@ -26,6 +26,15 @@ enum tegra_suspend_mode { TEGRA_MAX_SUSPEND_MODE, }; +#ifdef CONFIG_PM_SLEEP +enum tegra_suspend_mode tegra_pmc_get_suspend_mode(void); +void tegra_pmc_set_suspend_mode(enum tegra_suspend_mode mode); +u32 tegra_pmc_get_cpu_good_time(void); +u32 tegra_pmc_get_cpu_off_time(void); +void tegra_pmc_pm_set(void); +void tegra_pmc_suspend_init(void); +#endif + bool tegra_pmc_cpu_is_powered(int cpuid); int tegra_pmc_cpu_power_on(int cpuid); int tegra_pmc_cpu_remove_clamping(int cpuid); -- 1.8.1.5 -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
