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sysreset: add Qualcomm PSHOLD reset driver

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Number of Qualcomm ARMv7 SoC-s did not use PSCI but rather used PSHOLD
(Qualcomm Power Supply Hold Reset) bit to trigger reset or poweroff.

Qualcomm IPQ40XX is one of them, so provide a simple sysreset driver based
on the upstream Linux one, it is DT compatible as well.

Signed-off-by: Robert Marko <robert.marko@sartura.hr>
Reviewed-by: Caleb Connolly <caleb.connolly@linaro.org>
Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
This commit is contained in:
Robert Marko 2024-05-14 12:15:02 +02:00 • committed by Caleb Connolly
parent 9b3a9f896e
commit 86cc012207
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GPG key ID: 0583312B195F64B6
3 changed files with 62 additions and 0 deletions
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6
drivers/sysreset/Kconfig
View file

@ -240,6 +240,12 @@ config SYSRESET_RAA215300
help
Add support for the system reboot via the Renesas RAA215300 PMIC.
config SYSRESET_QCOM_PSHOLD
bool "Support sysreset for Qualcomm SoCs via PSHOLD"
depends on ARCH_IPQ40XX
help
Add support for the system reboot on Qualcomm SoCs via PSHOLD.
endif
endmenu

1
drivers/sysreset/Makefile
View file

@ -29,4 +29,5 @@ obj-$(CONFIG_SYSRESET_RESETCTL) += sysreset_resetctl.o
obj-$(CONFIG_$(SPL_TPL_)SYSRESET_AT91) += sysreset_at91.o
obj-$(CONFIG_$(SPL_TPL_)SYSRESET_X86) += sysreset_x86.o
obj-$(CONFIG_SYSRESET_RAA215300) += sysreset_raa215300.o
obj-$(CONFIG_SYSRESET_QCOM_PSHOLD) += sysreset_qcom-pshold.o
obj-$(CONFIG_TARGET_XTFPGA) += sysreset_xtfpga.o

55
drivers/sysreset/sysreset_qcom-pshold.c Normal file
View file

@ -0,0 +1,55 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* Qualcomm PSHOLD reset driver
*
* Copyright (c) 2024 Sartura Ltd.
*
* Author: Robert Marko <robert.marko@sartura.hr>
* Based on the Linux msm-poweroff driver.
*
*/
#include <dm.h>
#include <sysreset.h>
#include <asm/io.h>
#include <linux/delay.h>
struct qcom_pshold_priv {
phys_addr_t base;
};
static int qcom_pshold_request(struct udevice *dev, enum sysreset_t type)
{
struct qcom_pshold_priv *priv = dev_get_priv(dev);
writel(0, priv->base);
mdelay(10000);
return 0;
}
static struct sysreset_ops qcom_pshold_ops = {
.request = qcom_pshold_request,
};
static int qcom_pshold_probe(struct udevice *dev)
{
struct qcom_pshold_priv *priv = dev_get_priv(dev);
priv->base = dev_read_addr(dev);
return priv->base == FDT_ADDR_T_NONE ? -EINVAL : 0;
}
static const struct udevice_id qcom_pshold_ids[] = {
{ .compatible = "qcom,pshold", },
{ /* sentinel */ }
};
U_BOOT_DRIVER(qcom_pshold) = {
.name = "qcom_pshold",
.id = UCLASS_SYSRESET,
.of_match = qcom_pshold_ids,
.probe = qcom_pshold_probe,
.priv_auto = sizeof(struct qcom_pshold_priv),
.ops = &qcom_pshold_ops,
};