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From: sudeep.holla@arm.com (Sudeep Holla)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 3/3] drivers: firmware: psci: add system suspend support
Date: Thu, 18 Jun 2015 15:41:34 +0100	[thread overview]
Message-ID: <1434638494-514-4-git-send-email-sudeep.holla@arm.com> (raw)
In-Reply-To: <1434638494-514-1-git-send-email-sudeep.holla@arm.com>

PSCI v1.0 introduces a new API called PSCI_SYSTEM_SUSPEND. This API
provides the mechanism by which the calling OS can request entry into
the deepest possible system sleep state.

It meets all the necessary preconditions for entering suspend to RAM
state in Linux. This patch adds support for PSCI_SYSTEM_SUSPEND in psci
firmware and registers a psci system suspend operation to implement the
suspend-to-RAM(s2r) in a generic way on all the platforms implementing
PSCI.

Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
---
 drivers/firmware/psci.c   | 31 +++++++++++++++++++++++++++++++
 include/uapi/linux/psci.h |  3 +++
 2 files changed, 34 insertions(+)

diff --git a/drivers/firmware/psci.c b/drivers/firmware/psci.c
index 752ca7c9eb97..f2b2b3e1c6e4 100644
--- a/drivers/firmware/psci.c
+++ b/drivers/firmware/psci.c
@@ -20,11 +20,13 @@
 #include <linux/printk.h>
 #include <linux/psci.h>
 #include <linux/reboot.h>
+#include <linux/suspend.h>
 
 #include <uapi/linux/psci.h>
 
 #include <asm/system_misc.h>
 #include <asm/smp_plat.h>
+#include <asm/suspend.h>
 
 /*
  * While a 64-bit OS can make calls with SMC32 calling conventions, for some
@@ -222,6 +224,33 @@ static int __init psci_features(u32 psci_func_id)
 			      psci_func_id, 0, 0);
 }
 
+static int psci_system_suspend(unsigned long unused)
+{
+	return invoke_psci_fn(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND),
+			      virt_to_phys(cpu_resume), 0, 0);
+}
+
+static int psci_system_suspend_enter(suspend_state_t state)
+{
+	return cpu_suspend(0, psci_system_suspend);
+}
+
+static const struct platform_suspend_ops psci_suspend_ops = {
+	.valid          = suspend_valid_only_mem,
+	.enter          = psci_system_suspend_enter,
+};
+
+static void __init psci_init_system_suspend(void)
+{
+	if (!IS_ENABLED(CONFIG_SUSPEND))
+		return;
+
+	if (psci_features(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND)))
+		return;
+
+	suspend_set_ops(&psci_suspend_ops);
+}
+
 static void __init psci_init_cpu_suspend(void)
 {
 	int feature = psci_features(psci_function_id[PSCI_FN_CPU_SUSPEND]);
@@ -311,6 +340,8 @@ static int __init psci_probe(void)
 
 	psci_init_cpu_suspend();
 
+	psci_init_system_suspend();
+
 	return 0;
 }
 
diff --git a/include/uapi/linux/psci.h b/include/uapi/linux/psci.h
index 2598d7c9bf20..a1a2d85a91b9 100644
--- a/include/uapi/linux/psci.h
+++ b/include/uapi/linux/psci.h
@@ -47,6 +47,9 @@
 #define PSCI_0_2_FN64_MIGRATE_INFO_UP_CPU	PSCI_0_2_FN64(7)
 
 #define PSCI_1_0_FN_PSCI_FEATURES		PSCI_0_2_FN(10)
+#define PSCI_1_0_FN_SYSTEM_SUSPEND		PSCI_0_2_FN(14)
+
+#define PSCI_1_0_FN64_SYSTEM_SUSPEND		PSCI_0_2_FN64(14)
 
 /* PSCI v0.2 power state encoding for CPU_SUSPEND function */
 #define PSCI_0_2_POWER_STATE_ID_MASK		0xffff
-- 
1.9.1

  parent reply	other threads:[~2015-06-18 14:41 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-06-16 13:50 [PATCH 0/2] PSCI: " Sudeep Holla
2015-06-16 13:50 ` [PATCH 1/2] arm64: kernel: rename __cpu_suspend to keep it aligned with arm Sudeep Holla
2015-06-17 13:57   ` Lorenzo Pieralisi
2015-06-16 13:50 ` [PATCH 2/2] drivers: firmware: psci: add system suspend support Sudeep Holla
2015-06-17 15:08   ` Lorenzo Pieralisi
2015-06-17 15:41     ` Sudeep Holla
2015-06-18 14:41 ` [PATCH v2 0/3] PSCI: " Sudeep Holla
2015-06-18 14:41   ` [PATCH v2 1/3] arm64: kernel: rename __cpu_suspend to keep it aligned with arm Sudeep Holla
2015-06-18 14:55     ` Catalin Marinas
2015-06-18 15:08       ` Sudeep Holla
2015-06-19 13:50         ` Catalin Marinas
2015-06-18 14:41   ` [PATCH v2 2/3] drivers: firmware: psci: define more generic PSCI_FN_NATIVE macro Sudeep Holla
2015-09-14 13:17     ` Lorenzo Pieralisi
2015-09-14 13:21       ` Sudeep Holla
2015-06-18 14:41   ` Sudeep Holla [this message]
2015-07-14  6:17     ` [PATCH v2 3/3] drivers: firmware: psci: add system suspend support Jisheng Zhang
2015-07-14  9:14       ` Sudeep Holla
2015-07-14  9:50         ` Jisheng Zhang
2015-07-14 11:02           ` Sudeep Holla
2015-07-14 11:40             ` Jisheng Zhang
2015-07-14 13:18               ` Sudeep Holla
2015-07-15  2:34                 ` Jisheng Zhang
2015-07-15 10:20                   ` Sudeep Holla
2015-09-14 13:23     ` Lorenzo Pieralisi
2015-09-14 13:32       ` Sudeep Holla
2015-06-18 18:13   ` [PATCH v2 0/3] PSCI: " Ashwin Chaugule

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