165 lines
3.8 KiB
C
165 lines
3.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2017 Masahiro Yamada <yamada.masahiro@socionext.com>
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*
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* Based on drivers/firmware/psci.c from Linux:
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* Copyright (C) 2015 ARM Limited
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*/
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#include <common.h>
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#include <command.h>
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#include <dm.h>
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#include <irq_func.h>
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#include <log.h>
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#include <dm/lists.h>
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#include <efi_loader.h>
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#include <linux/delay.h>
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#include <linux/libfdt.h>
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#include <linux/arm-smccc.h>
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#include <linux/errno.h>
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#include <linux/printk.h>
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#include <linux/psci.h>
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#define DRIVER_NAME "psci"
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#define PSCI_METHOD_HVC 1
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#define PSCI_METHOD_SMC 2
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int __efi_runtime_data psci_method;
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unsigned long __efi_runtime invoke_psci_fn
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(unsigned long function_id, unsigned long arg0,
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unsigned long arg1, unsigned long arg2)
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{
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struct arm_smccc_res res;
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/*
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* In the __efi_runtime we need to avoid the switch statement. In some
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* cases the compiler creates lookup tables to implement switch. These
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* tables are not correctly relocated when SetVirtualAddressMap is
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* called.
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*/
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if (psci_method == PSCI_METHOD_SMC)
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arm_smccc_smc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res);
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else if (psci_method == PSCI_METHOD_HVC)
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arm_smccc_hvc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res);
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else
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res.a0 = PSCI_RET_DISABLED;
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return res.a0;
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}
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static int psci_bind(struct udevice *dev)
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{
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/* No SYSTEM_RESET support for PSCI 0.1 */
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if (device_is_compatible(dev, "arm,psci-0.2") ||
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device_is_compatible(dev, "arm,psci-1.0")) {
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int ret;
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/* bind psci-sysreset optionally */
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ret = device_bind_driver(dev, "psci-sysreset", "psci-sysreset",
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NULL);
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if (ret)
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pr_debug("PSCI System Reset was not bound.\n");
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}
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return 0;
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}
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static int psci_probe(struct udevice *dev)
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{
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const char *method;
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method = ofnode_read_string(dev_ofnode(dev), "method");
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if (!method) {
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pr_warn("missing \"method\" property\n");
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return -ENXIO;
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}
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if (!strcmp("hvc", method)) {
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psci_method = PSCI_METHOD_HVC;
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} else if (!strcmp("smc", method)) {
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psci_method = PSCI_METHOD_SMC;
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} else {
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pr_warn("invalid \"method\" property: %s\n", method);
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return -EINVAL;
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}
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return 0;
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}
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/**
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* void do_psci_probe() - probe PSCI firmware driver
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*
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* Ensure that psci_method is initialized.
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*/
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static void __maybe_unused do_psci_probe(void)
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{
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struct udevice *dev;
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uclass_get_device_by_name(UCLASS_FIRMWARE, DRIVER_NAME, &dev);
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}
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#if IS_ENABLED(CONFIG_EFI_LOADER) && IS_ENABLED(CONFIG_PSCI_RESET)
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efi_status_t efi_reset_system_init(void)
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{
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do_psci_probe();
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return EFI_SUCCESS;
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}
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void __efi_runtime EFIAPI efi_reset_system(enum efi_reset_type reset_type,
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efi_status_t reset_status,
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unsigned long data_size,
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void *reset_data)
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{
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if (reset_type == EFI_RESET_COLD ||
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reset_type == EFI_RESET_WARM ||
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reset_type == EFI_RESET_PLATFORM_SPECIFIC) {
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invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0);
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} else if (reset_type == EFI_RESET_SHUTDOWN) {
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invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0);
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}
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while (1)
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;
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}
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#endif /* IS_ENABLED(CONFIG_EFI_LOADER) && IS_ENABLED(CONFIG_PSCI_RESET) */
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#ifdef CONFIG_PSCI_RESET
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void reset_misc(void)
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{
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do_psci_probe();
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invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0);
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}
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#endif /* CONFIG_PSCI_RESET */
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#ifdef CONFIG_CMD_POWEROFF
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int do_poweroff(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
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{
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do_psci_probe();
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puts("poweroff ...\n");
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udelay(50000); /* wait 50 ms */
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disable_interrupts();
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invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0);
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enable_interrupts();
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log_err("Power off not supported on this platform\n");
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return CMD_RET_FAILURE;
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}
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#endif
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static const struct udevice_id psci_of_match[] = {
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{ .compatible = "arm,psci" },
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{ .compatible = "arm,psci-0.2" },
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{ .compatible = "arm,psci-1.0" },
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{},
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};
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U_BOOT_DRIVER(psci) = {
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.name = DRIVER_NAME,
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.id = UCLASS_FIRMWARE,
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.of_match = psci_of_match,
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.bind = psci_bind,
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.probe = psci_probe,
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};
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