On Thu, 7 Nov 2019, Christoph Hellwig wrote: > Add a trivial poweroff driver for the qemu-virt test device that > allows an oderly shutdown of the VM. "orderly" > > Signed-off-by: Christoph Hellwig <hch@xxxxxx> > --- > arch/riscv/configs/defconfig | 2 + > drivers/power/reset/Kconfig | 8 ++++ > drivers/power/reset/Makefile | 1 + > .../power/reset/qemu-riscv-virt-poweroff.c | 47 +++++++++++++++++++ > 4 files changed, 58 insertions(+) > create mode 100644 drivers/power/reset/qemu-riscv-virt-poweroff.c > > diff --git a/arch/riscv/configs/defconfig b/arch/riscv/configs/defconfig > index 420a0dbef386..47da87725b5e 100644 > --- a/arch/riscv/configs/defconfig > +++ b/arch/riscv/configs/defconfig > @@ -63,6 +63,8 @@ CONFIG_HW_RANDOM_VIRTIO=y > CONFIG_SPI=y > CONFIG_SPI_SIFIVE=y > # CONFIG_PTP_1588_CLOCK is not set > +CONFIG_POWER_RESET=y > +CONFIG_QEMU_RISCV_VIRT_POWEROFF=y > CONFIG_DRM=y > CONFIG_DRM_RADEON=y > CONFIG_DRM_VIRTIO_GPU=y > diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig > index a564237278ff..56cb18520850 100644 > --- a/drivers/power/reset/Kconfig > +++ b/drivers/power/reset/Kconfig > @@ -256,5 +256,13 @@ config NVMEM_REBOOT_MODE > then the bootloader can read it and take different > action according to the mode. > > +config QEMU_RISCV_VIRT_POWEROFF > + tristate "QEMU RISC-V virt machine poweroff driver" > + depends on OF > + depends on RISCV || COMPILE_TEST > + help > + Say y here to allow RISC-V Qemu VMs to be shut down by > + the kernel. Same comments here and below as https://lore.kernel.org/linux-riscv/mhng-0dedc685-73d2-4e7f-b608-69385a6e7a99@palmer-si-x1c4/T/#t there's nothing that should be RISC-V specific here. > + > endif > > diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile > index 85da3198e4e0..b3094016b634 100644 > --- a/drivers/power/reset/Makefile > +++ b/drivers/power/reset/Makefile > @@ -30,3 +30,4 @@ obj-$(CONFIG_REBOOT_MODE) += reboot-mode.o > obj-$(CONFIG_SYSCON_REBOOT_MODE) += syscon-reboot-mode.o > obj-$(CONFIG_POWER_RESET_SC27XX) += sc27xx-poweroff.o > obj-$(CONFIG_NVMEM_REBOOT_MODE) += nvmem-reboot-mode.o > +obj-$(CONFIG_QEMU_RISCV_VIRT_POWEROFF) += qemu-riscv-virt-poweroff.o > diff --git a/drivers/power/reset/qemu-riscv-virt-poweroff.c b/drivers/power/reset/qemu-riscv-virt-poweroff.c > new file mode 100644 > index 000000000000..5b9a12dd853b > --- /dev/null > +++ b/drivers/power/reset/qemu-riscv-virt-poweroff.c > @@ -0,0 +1,47 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Copyright (c) 2019 Christoph Hellwig. > + */ > + > +#include <linux/reboot.h> > +#include <linux/init.h> > +#include <linux/io.h> > +#include <linux/platform_device.h> > +#include <linux/of_address.h> > +#include <linux/module.h> > + > +#define VIRT_TEST_FINISHER_PASS 0x5555 > + > +static u16 __iomem *test_addr; > + > +static void qemu_virt_power_off(void) > +{ > + writew(VIRT_TEST_FINISHER_PASS, test_addr); > +} > + > +static int sifive_test_probe(struct platform_device *pdev) > +{ > + /* there can only be a single instance */ > + if (WARN_ON_ONCE(test_addr)) > + return -EINVAL; > + > + test_addr = of_iomap(pdev->dev.of_node, 0); > + if (!test_addr) > + return -EINVAL; > + pm_power_off = qemu_virt_power_off; > + return 0; > +} > + > +static const struct of_device_id sifive_test_of_match[] = { > + { .compatible = "sifive,test0", }, > + {}, > +}; > + > +static struct platform_driver sifive_test_driver = { > + .probe = sifive_test_probe, > + .driver = { > + .name = "sifive_test", > + .of_match_table = sifive_test_of_match, > + }, > +}; > +module_platform_driver(sifive_test_driver); > -- > 2.20.1 > > - Paul
