GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

2026-09-06 03:52:57 +08:00
commit b1928b41c0
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+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
+ *
+ * Generic reset driver for x86 processor
+ */
+
+#include <common.h>
+#include <acpi_s3.h>
+#include <dm.h>
+#include <efi_loader.h>
+#include <pch.h>
+#include <sysreset.h>
+#include <asm/io.h>
+#include <asm/processor.h>
+
+struct x86_sysreset_platdata {
+	struct udevice *pch;
+};
+
+/*
+ * Power down the machine by using the power management sleep control
+ * of the chipset. This will currently only work on Intel chipsets.
+ * However, adapting it to new chipsets is fairly simple. You will
+ * have to find the IO address of the power management register block
+ * in your southbridge, and look up the appropriate SLP_TYP_S5 value
+ * from your southbridge's data sheet.
+ *
+ * This function never returns.
+ */
+int pch_sysreset_power_off(struct udevice *dev)
+{
+	struct x86_sysreset_platdata *plat = dev_get_platdata(dev);
+	struct pch_pmbase_info pm;
+	u32 reg32;
+	int ret;
+
+	if (!plat->pch)
+		return -ENOENT;
+	ret = pch_ioctl(plat->pch, PCH_REQ_PMBASE_INFO, &pm, sizeof(pm));
+	if (ret)
+		return ret;
+
+	/*
+	 * Mask interrupts or system might stay in a coma, not executing code
+	 * anymore, but not powered off either.
+	 */
+	asm("cli");
+
+	/*
+	 * Avoid any GPI waking the system from S5* or the system might stay in
+	 * a coma
+	 */
+	outl(0x00000000, pm.base + pm.gpio0_en_ofs);
+
+	/* Clear Power Button Status */
+	outw(PWRBTN_STS, pm.base + pm.pm1_sts_ofs);
+
+	/* PMBASE + 4, Bit 10-12, Sleeping Type, * set to 111 -> S5, soft_off */
+	reg32 = inl(pm.base + pm.pm1_cnt_ofs);
+
+	/* Set Sleeping Type to S5 (poweroff) */
+	reg32 &= ~(SLP_EN | SLP_TYP);
+	reg32 |= SLP_TYP_S5;
+	outl(reg32, pm.base + pm.pm1_cnt_ofs);
+
+	/* Now set the Sleep Enable bit */
+	reg32 |= SLP_EN;
+	outl(reg32, pm.base + pm.pm1_cnt_ofs);
+
+	for (;;)
+		asm("hlt");
+}
+
+static int x86_sysreset_request(struct udevice *dev, enum sysreset_t type)
+{
+	int value;
+	int ret;
+
+	switch (type) {
+	case SYSRESET_WARM:
+		value = SYS_RST | RST_CPU;
+		break;
+	case SYSRESET_COLD:
+		value = SYS_RST | RST_CPU | FULL_RST;
+		break;
+	case SYSRESET_POWER_OFF:
+		ret = pch_sysreset_power_off(dev);
+		if (ret)
+			return ret;
+		return -EINPROGRESS;
+	default:
+		return -ENOSYS;
+	}
+
+	outb(value, IO_PORT_RESET);
+
+	return -EINPROGRESS;
+}
+
+static int x86_sysreset_get_last(struct udevice *dev)
+{
+	return SYSRESET_POWER;
+}
+
+#ifdef CONFIG_EFI_LOADER
+void __efi_runtime EFIAPI efi_reset_system(
+			enum efi_reset_type reset_type,
+			efi_status_t reset_status,
+			unsigned long data_size, void *reset_data)
+{
+	int value;
+
+	/*
+	 * inline this code since we are not caused in the context of a
+	 * udevice and passing NULL to x86_sysreset_request() is too horrible.
+	 */
+	if (reset_type == EFI_RESET_COLD ||
+		 reset_type == EFI_RESET_PLATFORM_SPECIFIC)
+		value = SYS_RST | RST_CPU | FULL_RST;
+	else /* assume EFI_RESET_WARM since we cannot return an error */
+		value = SYS_RST | RST_CPU;
+	outb(value, IO_PORT_RESET);
+
+	/* TODO EFI_RESET_SHUTDOWN */
+
+	while (1) { }
+}
+#endif
+
+static int x86_sysreset_probe(struct udevice *dev)
+{
+	struct x86_sysreset_platdata *plat = dev_get_platdata(dev);
+
+	/* Locate the PCH if there is one. It isn't essential */
+	uclass_first_device(UCLASS_PCH, &plat->pch);
+
+	return 0;
+}
+
+static const struct udevice_id x86_sysreset_ids[] = {
+	{ .compatible = "x86,reset" },
+	{ }
+};
+
+static struct sysreset_ops x86_sysreset_ops = {
+	.request = x86_sysreset_request,
+	.get_last = x86_sysreset_get_last,
+};
+
+U_BOOT_DRIVER(x86_sysreset) = {
+	.name = "x86-sysreset",
+	.id = UCLASS_SYSRESET,
+	.of_match = x86_sysreset_ids,
+	.ops = &x86_sysreset_ops,
+	.probe = x86_sysreset_probe,
+	.platdata_auto_alloc_size	= sizeof(struct x86_sysreset_platdata),
+};