From patchwork Wed Mar 13 08:01:18 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joseph Lo X-Patchwork-Id: 2262151 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork2.kernel.org Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) by patchwork2.kernel.org (Postfix) with ESMTP id 7A930DF215 for ; Wed, 13 Mar 2013 08:06:14 +0000 (UTC) Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1UFgeM-0001ZG-L0; Wed, 13 Mar 2013 08:03:02 +0000 Received: from hqemgate03.nvidia.com ([216.228.121.140]) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1UFgdL-0001J7-PH for linux-arm-kernel@lists.infradead.org; Wed, 13 Mar 2013 08:02:03 +0000 Received: from hqnvupgp07.nvidia.com (Not Verified[216.228.121.13]) by hqemgate03.nvidia.com id ; Wed, 13 Mar 2013 01:07:09 -0700 Received: from hqemhub03.nvidia.com ([172.17.108.22]) by hqnvupgp07.nvidia.com (PGP Universal service); Wed, 13 Mar 2013 01:01:56 -0700 X-PGP-Universal: processed; by hqnvupgp07.nvidia.com on Wed, 13 Mar 2013 01:01:56 -0700 Received: from jlo-ubuntu-64.nvidia.com (172.20.144.16) by hqemhub03.nvidia.com (172.20.150.15) with Microsoft SMTP Server (TLS) id 8.3.298.1; Wed, 13 Mar 2013 01:01:55 -0700 From: Joseph Lo To: Stephen Warren Subject: [PATCH V3 4/9] ARM: tegra: pm: add platform suspend support Date: Wed, 13 Mar 2013 16:01:18 +0800 Message-ID: <1363161683-20825-5-git-send-email-josephl@nvidia.com> X-Mailer: git-send-email 1.8.1.5 In-Reply-To: <1363161683-20825-1-git-send-email-josephl@nvidia.com> References: <1363161683-20825-1-git-send-email-josephl@nvidia.com> X-NVConfidentiality: public MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20130313_040200_001775_7CBB6BA7 X-CRM114-Status: GOOD ( 16.72 ) X-Spam-Score: -9.5 (---------) X-Spam-Report: SpamAssassin version 3.3.2 on merlin.infradead.org summary: Content analysis details: (-9.5 points) pts rule name description ---- ---------------------- -------------------------------------------------- -5.0 RCVD_IN_DNSWL_HI RBL: Sender listed at http://www.dnswl.org/, high trust [216.228.121.140 listed in list.dnswl.org] -0.0 SPF_HELO_PASS SPF: HELO matches SPF record -0.0 SPF_PASS SPF: sender matches SPF record -2.6 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] Cc: linux-tegra@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Joseph Lo X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org 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 --- 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 #include #include +#include #include #include #include @@ -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 #include +#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);