Kuan-Wei Chiu <[email protected]> schrieb am Mi., 7. Jan. 2026, 21:19:
> Introduce a new sysreset driver for the QEMU Virtual System Controller. > This device is found on QEMU "virt" machines (such as the m68k virt > target) and provides a mechanism to trigger system reset and power-off > events. > > The driver maps U-Boot sysreset types to the corresponding controller > commands: > - SYSRESET_WARM / SYSRESET_COLD -> VIRT_CTRL_CMD_RESET > - SYSRESET_POWER_OFF -> VIRT_CTRL_CMD_HALT > > Signed-off-by: Kuan-Wei Chiu <[email protected]> > --- > Changes in v6: > - Introduce new driver to replace board-file reset implementation. > > MAINTAINERS | 6 +++ > drivers/sysreset/Kconfig | 8 ++++ > drivers/sysreset/Makefile | 1 + > drivers/sysreset/sysreset_qemu_virt_ctrl.c | 55 ++++++++++++++++++++++ > include/qemu_virt_ctrl.h | 13 +++++ > 5 files changed, 83 insertions(+) > create mode 100644 drivers/sysreset/sysreset_qemu_virt_ctrl.c > create mode 100644 include/qemu_virt_ctrl.h > > diff --git a/MAINTAINERS b/MAINTAINERS > index efecb213be7..34081769ecd 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -1598,6 +1598,12 @@ S: Maintained > T: git https://source.denx.de/u-boot/custodians/u-boot-mpc85xx.git > F: arch/powerpc/cpu/mpc85xx/ > > +QEMU VIRTUAL SYSTEM CONTROLLER > +M: Kuan-Wei Chiu <[email protected]> > +S: Maintained > +F: drivers/sysreset/sysreset_qemu_virt_ctrl.c > +F: include/qemu_virt_ctrl.h > + > RAW NAND > M: Dario Binacchi <[email protected]> > M: Michael Trimarchi <[email protected]> > diff --git a/drivers/sysreset/Kconfig b/drivers/sysreset/Kconfig > index 0181f6cd581..120e7510f15 100644 > --- a/drivers/sysreset/Kconfig > +++ b/drivers/sysreset/Kconfig > @@ -298,6 +298,14 @@ config SYSRESET_QCOM_PSHOLD > help > Add support for the system reboot on Qualcomm SoCs via PSHOLD. > > +config SYSRESET_QEMU_VIRT_CTRL > + bool "QEMU Virtual System Controller support" > + depends on SYSRESET > + help > + Enable support for the QEMU Virtual System Controller. > + This device is used in QEMU machines (e.g. m68k virt) to trigger > Is this specific to m68k or does it work on all QEMU architectures? If it works everywhere, I would not mention m68k here. On x86 QEMU we currently lack poweroff support. So this would come in handy. Best regards Heinrich + system reset and poweroff events. > + > endif > > endmenu > diff --git a/drivers/sysreset/Makefile b/drivers/sysreset/Makefile > index f5c78b25896..d18a5d52360 100644 > --- a/drivers/sysreset/Makefile > +++ b/drivers/sysreset/Makefile > @@ -32,3 +32,4 @@ obj-$(CONFIG_$(PHASE_)SYSRESET_X86) += sysreset_x86.o > obj-$(CONFIG_SYSRESET_RAA215300) += sysreset_raa215300.o > obj-$(CONFIG_SYSRESET_QCOM_PSHOLD) += sysreset_qcom-pshold.o > obj-$(CONFIG_TARGET_XTFPGA) += sysreset_xtfpga.o > +obj-$(CONFIG_SYSRESET_QEMU_VIRT_CTRL) += sysreset_qemu_virt_ctrl.o > diff --git a/drivers/sysreset/sysreset_qemu_virt_ctrl.c > b/drivers/sysreset/sysreset_qemu_virt_ctrl.c > new file mode 100644 > index 00000000000..e7cacc9b6e9 > --- /dev/null > +++ b/drivers/sysreset/sysreset_qemu_virt_ctrl.c > @@ -0,0 +1,55 @@ > +// SPDX-License-Identifier: GPL-2.0-or-later > +/* > + * Copyright (C) 2025, Kuan-Wei Chiu <[email protected]> > + * > + * QEMU Virtual System Controller Driver > + */ > + > +#include <dm.h> > +#include <qemu_virt_ctrl.h> > +#include <sysreset.h> > +#include <asm/io.h> > +#include <linux/err.h> > + > +/* Register offsets */ > +#define VIRT_CTRL_REG_FEATURES 0x00 > +#define VIRT_CTRL_REG_CMD 0x04 > + > +/* Commands */ > +#define VIRT_CTRL_CMD_NOOP 0x00 > +#define VIRT_CTRL_CMD_RESET 0x01 > +#define VIRT_CTRL_CMD_HALT 0x02 > +#define VIRT_CTRL_CMD_PANIC 0x03 > + > +static int qemu_virt_ctrl_request(struct udevice *dev, enum sysreset_t > type) > +{ > + struct qemu_virt_ctrl_plat *plat = dev_get_plat(dev); > + u32 val; > + > + switch (type) { > + case SYSRESET_WARM: > + case SYSRESET_COLD: > + val = VIRT_CTRL_CMD_RESET; > + break; > + case SYSRESET_POWER_OFF: > + val = VIRT_CTRL_CMD_HALT; > + break; > + default: > + return -EPROTONOSUPPORT; > + } > + > + writel(val, plat->reg + VIRT_CTRL_REG_CMD); > + > + return -EINPROGRESS; > +} > + > +static struct sysreset_ops qemu_virt_ctrl_ops = { > + .request = qemu_virt_ctrl_request, > +}; > + > +U_BOOT_DRIVER(sysreset_qemu_virt_ctrl) = { > + .name = "sysreset_qemu_virt_ctrl", > + .id = UCLASS_SYSRESET, > + .ops = &qemu_virt_ctrl_ops, > + .plat_auto = sizeof(struct qemu_virt_ctrl_plat), > +}; > diff --git a/include/qemu_virt_ctrl.h b/include/qemu_virt_ctrl.h > new file mode 100644 > index 00000000000..05aad82b767 > --- /dev/null > +++ b/include/qemu_virt_ctrl.h > @@ -0,0 +1,13 @@ > +/* SPDX-License-Identifier: GPL-2.0-or-later */ > +/* > + * Copyright (C) 2025, Kuan-Wei Chiu <[email protected]> > + */ > + > +#ifndef _QEMU_VIRT_CTRL_H_ > +#define _QEMU_VIRT_CTRL_H_ > + > +struct qemu_virt_ctrl_plat { > + phys_addr_t reg; > +}; > + > +#endif /* _QEMU_VIRT_CTRL_H_ */ > -- > 2.52.0.457.g6b5491de43-goog > >
