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sysreset: Implement PSCI based reset to EDL mode for QCOM SoCs

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Implement request_arg() sysreset_op for QCOM SoCs that use
PSCI to reset to EDL (Emergency Download) mode.

Reviewed-by: Casey Connolly <casey.connolly@linaro.org>
Reviewed-by: Sumit Garg <sumit.garg@oss.qualcomm.com>
Signed-off-by: Varadarajan Narayanan <varadarajan.narayanan@oss.qualcomm.com>
Link: https://patch.msgid.link/20260121063920.1500293-4-varadarajan.narayanan@oss.qualcomm.com
[casey: add missing ARM_SMCCC depends to kconfig to fix CI allyesconfig]
Signed-off-by: Casey Connolly <casey.connolly@linaro.org>
This commit is contained in:
Varadarajan Narayanan 2026-01-21 12:09:18 +05:30 committed by Casey Connolly
parent fcb48b8981
commit 32825eaddc
4 changed files with 57 additions and 0 deletions
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4
drivers/firmware/psci.c
View File

@ -186,6 +186,10 @@ static int psci_bind(struct udevice *dev)
NULL);
if (ret)
pr_debug("PSCI System Reset was not bound.\n");
if (IS_ENABLED(CONFIG_SYSRESET_QCOM_PSCI) &&
device_bind_driver(dev, "qcom_psci-sysreset",
"qcom_psci-sysreset", NULL))
pr_debug("QCOM PSCI System Reset was not bound.\n");
}
/* From PSCI v1.0 onward we can discover services through ARM_SMCCC_FEATURE */

7
drivers/sysreset/Kconfig
View File

@ -301,6 +301,13 @@ config SYSRESET_RAA215300
help
Add support for the system reboot via the Renesas RAA215300 PMIC.
config SYSRESET_QCOM_PSCI
bool "Support reset to EDL for Qualcomm SoCs via PSCI"
depends on ARM_SMCCC
help
Add support for the reset to EDL (Emergency Download) on Qualcomm
SoCs via PSCI.
config SYSRESET_QCOM_PSHOLD
bool "Support sysreset for Qualcomm SoCs via PSHOLD"
help

1
drivers/sysreset/Makefile
View File

@ -30,6 +30,7 @@ obj-$(CONFIG_SYSRESET_RESETCTL) += sysreset_resetctl.o
obj-$(CONFIG_$(PHASE_)SYSRESET_AT91) += sysreset_at91.o
obj-$(CONFIG_$(PHASE_)SYSRESET_X86) += sysreset_x86.o
obj-$(CONFIG_SYSRESET_RAA215300) += sysreset_raa215300.o
obj-$(CONFIG_SYSRESET_QCOM_PSCI) += sysreset_qcom-psci.o
obj-$(CONFIG_SYSRESET_QCOM_PSHOLD) += sysreset_qcom-pshold.o
obj-$(CONFIG_TARGET_XTFPGA) += sysreset_xtfpga.o
obj-$(CONFIG_SYSRESET_QEMU_VIRT_CTRL) += sysreset_qemu_virt_ctrl.o

45
drivers/sysreset/sysreset_qcom-psci.c Normal file
View File

@ -0,0 +1,45 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2017 Masahiro Yamada <yamada.masahiro@socionext.com>
* Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
*/
#include <dm.h>
#include <sysreset.h>
#include <asm/system.h>
#include <linux/errno.h>
#include <linux/psci.h>
#include <asm/psci.h>
static int qcom_psci_sysreset_get_status(struct udevice *dev, char *buf, int size)
{
return -EOPNOTSUPP;
}
static int qcom_psci_sysreset_request_arg(struct udevice *dev, int argc,
char * const argv[])
{
if (!strncasecmp(argv[1], "-edl", 4)) {
/* Supported in qcs9100, qcs8300, sc7280, qcs615 */
if (psci_features(ARM_PSCI_1_1_FN64_SYSTEM_RESET2) ==
ARM_PSCI_RET_SUCCESS) {
psci_system_reset2(0, 1);
return -EINPROGRESS;
}
printf("PSCI SYSTEM_RESET2 not supported\n");
}
return -EPROTONOSUPPORT;
}
static struct sysreset_ops qcom_psci_sysreset_ops = {
.request_arg = qcom_psci_sysreset_request_arg,
.get_status = qcom_psci_sysreset_get_status,
};
U_BOOT_DRIVER(qcom_psci_sysreset) = {
.name = "qcom_psci-sysreset",
.id = UCLASS_SYSRESET,
.ops = &qcom_psci_sysreset_ops,
.flags = DM_FLAG_PRE_RELOC,
};