From: Elliot Berman <eberman@codeaurora.org>
To: Mark Rutland <mark.rutland@arm.com>,
Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
Sudeep Holla <sudeep.holla@arm.com>
Cc: Elliot Berman <eberman@codeaurora.org>,
Bjorn Andersson <bjorn.andersson@linaro.org>,
Trilok Soni <tsoni@codeaurora.org>,
Prasad Sodagudi <psodagud@codeaurora.org>,
David Collins <collinsd@codeaurora.org>,
linux-arm-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [RFC v2 2/3] firmware: psci: Add support for dt-supplied SYSTEM_RESET2 type
Date: Fri, 31 Jan 2020 11:08:50 -0800 [thread overview]
Message-ID: <1580497731-9845-3-git-send-email-eberman@codeaurora.org> (raw)
In-Reply-To: <1580497731-9845-1-git-send-email-eberman@codeaurora.org>
Some implementors of PSCI may relax the requirements of the PSCI
architectural warm reset. In order to comply with PSCI specification, a
different reset_type value must be used. The alternate PSCI
SYSTEM_RESET2 may be used in all warm/soft reboot scenarios, replacing
the architectural warm reset.
Signed-off-by: Elliot Berman <eberman@codeaurora.org>
---
drivers/firmware/psci/psci.c | 21 +++++++++++++++++----
include/linux/psci.h | 1 +
include/uapi/linux/psci.h | 2 ++
3 files changed, 20 insertions(+), 4 deletions(-)
diff --git a/drivers/firmware/psci/psci.c b/drivers/firmware/psci/psci.c
index 2937d44..75e6a38 100644
--- a/drivers/firmware/psci/psci.c
+++ b/drivers/firmware/psci/psci.c
@@ -55,6 +55,7 @@ bool psci_tos_resident_on(int cpu)
struct psci_operations psci_ops = {
.conduit = SMCCC_CONDUIT_NONE,
.smccc_version = SMCCC_VERSION_1_0,
+ .sys_reset2_reset_type = PSCI_1_1_SYSTEM_RESET2_SYSTEM_WARM_RESET,
};
enum arm_smccc_conduit arm_smccc_1_1_get_conduit(void)
@@ -272,11 +273,10 @@ static void psci_sys_reset(enum reboot_mode reboot_mode, const char *cmd)
if ((reboot_mode == REBOOT_WARM || reboot_mode == REBOOT_SOFT) &&
psci_system_reset2_supported) {
/*
- * reset_type[31] = 0 (architectural)
- * reset_type[30:0] = 0 (SYSTEM_WARM_RESET)
* cookie = 0 (ignored by the implementation)
*/
- invoke_psci_fn(PSCI_FN_NATIVE(1_1, SYSTEM_RESET2), 0, 0, 0);
+ invoke_psci_fn(PSCI_FN_NATIVE(1_1, SYSTEM_RESET2),
+ psci_ops.sys_reset2_reset_type, 0, 0);
} else {
invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0);
}
@@ -493,6 +493,7 @@ typedef int (*psci_initcall_t)(const struct device_node *);
static int __init psci_0_2_init(struct device_node *np)
{
int err;
+ u32 param;
err = get_set_conduit_method(np);
if (err)
@@ -505,7 +506,19 @@ static int __init psci_0_2_init(struct device_node *np)
* can be carried out according to the specific version reported
* by firmware
*/
- return psci_probe();
+ err = psci_probe();
+ if (err)
+ return err;
+
+ if (psci_system_reset2_supported &&
+ !of_property_read_u32(np, "arm,psci-sys-reset2-type", ¶m)) {
+ if ((s32)param > 0)
+ pr_warn("%08x is an invalid architectural reset type.\n",
+ param);
+ psci_ops.sys_reset2_reset_type = param;
+ }
+
+ return 0;
}
/*
diff --git a/include/linux/psci.h b/include/linux/psci.h
index a67712b..1959a80 100644
--- a/include/linux/psci.h
+++ b/include/linux/psci.h
@@ -37,6 +37,7 @@ struct psci_operations {
int (*migrate_info_type)(void);
enum arm_smccc_conduit conduit;
enum smccc_version smccc_version;
+ u32 sys_reset2_reset_type;
};
extern struct psci_operations psci_ops;
diff --git a/include/uapi/linux/psci.h b/include/uapi/linux/psci.h
index 2fcad1d..d786ec8 100644
--- a/include/uapi/linux/psci.h
+++ b/include/uapi/linux/psci.h
@@ -55,6 +55,8 @@
#define PSCI_1_0_FN64_SYSTEM_SUSPEND PSCI_0_2_FN64(14)
#define PSCI_1_1_FN64_SYSTEM_RESET2 PSCI_0_2_FN64(18)
+#define PSCI_1_1_SYSTEM_RESET2_SYSTEM_WARM_RESET 0
+
/* PSCI v0.2 power state encoding for CPU_SUSPEND function */
#define PSCI_0_2_POWER_STATE_ID_MASK 0xffff
#define PSCI_0_2_POWER_STATE_ID_SHIFT 0
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
next prev parent reply other threads:[~2020-01-31 19:09 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-31 19:08 [RFC v2 0/3] ARM PSCI: Add support for vendor-specific SYSTEM_RESET2 Elliot Berman
2020-01-31 19:08 ` [RFC v2 1/3] dt: psci: Add arm,psci-sys-reset2-type property Elliot Berman
2020-01-31 19:08 ` Elliot Berman [this message]
2020-01-31 19:08 ` [RFC v2 3/3] arm64: dts: qcom: sm8250: Add vendor-specific PSCI system reset2 type Elliot Berman
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