1 // SPDX-License-Identifier: GPL-2.0-only
7 #define pr_fmt(fmt) "psci: " fmt
10 #include <linux/arm-smccc.h>
17 #include <linux/psci.h>
22 #include <uapi/linux/psci.h>
31  * While a 64-bit OS can make calls with SMC32 calling conventions, for some
32  * calls it is necessary to use SMC64 to pass or return 64-bit values.
34  * (native-width) function ID.
45  * a Trusted OS even if it claims to be capable of migration -- doing so will
48 static int resident_cpu = -1;
135 		return -EOPNOTSUPP;  in psci_to_linux_errno()
138 		return -EINVAL;  in psci_to_linux_errno()
140 		return -EPERM;  in psci_to_linux_errno()
143 	return -EINVAL;  in psci_to_linux_errno()
148 	return PSCI_VERSION(0, 1);  in psci_0_1_get_version()
270 		WARN(1, "Unexpected PSCI conduit %d\n", conduit);  in set_conduit()
284 		return -ENXIO;  in get_set_conduit_method()
293 		return -EINVAL;  in get_set_conduit_method()
308 		invoke_psci_fn(PSCI_FN_NATIVE(1_1, SYSTEM_RESET2), 0, 0, 0);  in psci_sys_reset()
355 	return invoke_psci_fn(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND),  in psci_system_suspend()
373 	ret = psci_features(PSCI_FN_NATIVE(1_1, SYSTEM_RESET2));  in psci_init_system_reset2()
386 	ret = psci_features(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND));  in psci_init_system_suspend()
407 	int type, cpu = -1;  in psci_init_migrate()
435 	resident_cpu = cpu >= 0 ? cpu : -1;  in psci_init_migrate()
457 	 * Conveniently, the SMCCC and PSCI versions are encoded the  in psci_init_smccc()
467 	pr_info("Using standard PSCI v0.2 function IDs\n");  in psci_0_2_set_functions()
485  * Probe function for PSCI firmware versions >= 0.2
496 		pr_err("Conflicting PSCI version detected.\n");  in psci_probe()
497 		return -EINVAL;  in psci_probe()
504 	if (PSCI_VERSION_MAJOR(ver) >= 1) {  in psci_probe()
517  * PSCI init function for PSCI versions >=0.2
519  * Probe based on PSCI PSCI_VERSION function
530 	 * Starting with v0.2, the PSCI specification introduced a call  in psci_0_2_init()
532 	 * that PSCI function IDs and version specific initialization  in psci_0_2_init()
540  * PSCI < v0.2 get PSCI Function IDs via DT.
551 	pr_info("Using PSCI v0.1 Function IDs from DT\n");  in psci_0_1_init()
597 	{ .compatible = "arm,psci",	.data = psci_0_1_init},
598 	{ .compatible = "arm,psci-0.2",	.data = psci_0_2_init},
599 	{ .compatible = "arm,psci-1.0",	.data = psci_1_0_init},
613 		return -ENODEV;  in psci_dt_init()
615 	init_fn = (psci_initcall_t)matched_np->data;  in psci_dt_init()
624  * We use PSCI 0.2+ when ACPI is deployed on ARM64 and it's
631 		return -EOPNOTSUPP;  in psci_acpi_init()