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0429298a1a
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 <visitorckw@gmail.com> Reviewed-by: Simon Glass <simon.glass@canonical.com>
56 lines
1.2 KiB
C
56 lines
1.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2025, Kuan-Wei Chiu <visitorckw@gmail.com>
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*
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* QEMU Virtual System Controller Driver
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*/
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#include <dm.h>
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#include <qemu_virt_ctrl.h>
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#include <sysreset.h>
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#include <asm/io.h>
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#include <linux/err.h>
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/* Register offsets */
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#define VIRT_CTRL_REG_FEATURES 0x00
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#define VIRT_CTRL_REG_CMD 0x04
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/* Commands */
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#define VIRT_CTRL_CMD_NOOP 0x00
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#define VIRT_CTRL_CMD_RESET 0x01
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#define VIRT_CTRL_CMD_HALT 0x02
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#define VIRT_CTRL_CMD_PANIC 0x03
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static int qemu_virt_ctrl_request(struct udevice *dev, enum sysreset_t type)
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{
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struct qemu_virt_ctrl_plat *plat = dev_get_plat(dev);
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u32 val;
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switch (type) {
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case SYSRESET_WARM:
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case SYSRESET_COLD:
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val = VIRT_CTRL_CMD_RESET;
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break;
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case SYSRESET_POWER_OFF:
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val = VIRT_CTRL_CMD_HALT;
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break;
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default:
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return -EPROTONOSUPPORT;
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}
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writel(val, plat->reg + VIRT_CTRL_REG_CMD);
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return -EINPROGRESS;
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}
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static struct sysreset_ops qemu_virt_ctrl_ops = {
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.request = qemu_virt_ctrl_request,
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};
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U_BOOT_DRIVER(sysreset_qemu_virt_ctrl) = {
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.name = "sysreset_qemu_virt_ctrl",
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.id = UCLASS_SYSRESET,
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.ops = &qemu_virt_ctrl_ops,
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.plat_auto = sizeof(struct qemu_virt_ctrl_plat),
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};
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