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>
32  * While a 64-bit OS can make calls with SMC32 calling conventions, for some
33  * calls it is necessary to use SMC64 to pass or return 64-bit values.
35  * (native-width) function ID.
46  * a Trusted OS even if it claims to be capable of migration -- doing so will
49 static int resident_cpu = -1;
136 		return -EOPNOTSUPP;  in psci_to_linux_errno()
139 		return -EINVAL;  in psci_to_linux_errno()
141 		return -EPERM;  in psci_to_linux_errno()
144 	return -EINVAL;  in psci_to_linux_errno()
149 	return PSCI_VERSION(0, 1);  in psci_0_1_get_version()
271 		WARN(1, "Unexpected PSCI conduit %d\n", conduit);  in set_conduit()
285 		return -ENXIO;  in get_set_conduit_method()
294 		return -EINVAL;  in get_set_conduit_method()
309 		invoke_psci_fn(PSCI_FN_NATIVE(1_1, SYSTEM_RESET2), 0, 0, 0);  in psci_sys_reset()
364 	return invoke_psci_fn(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND),  in psci_system_suspend()
382 	ret = psci_features(PSCI_FN_NATIVE(1_1, SYSTEM_RESET2));  in psci_init_system_reset2()
395 	ret = psci_features(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND));  in psci_init_system_suspend()
416 	int type, cpu = -1;  in psci_init_migrate()
444 	resident_cpu = cpu >= 0 ? cpu : -1;  in psci_init_migrate()
466 	 * Conveniently, the SMCCC and PSCI versions are encoded the  in psci_init_smccc()
476 	pr_info("Using standard PSCI v0.2 function IDs\n");  in psci_0_2_set_functions()
494  * Probe function for PSCI firmware versions >= 0.2
505 		pr_err("Conflicting PSCI version detected.\n");  in psci_probe()
506 		return -EINVAL;  in psci_probe()
513 	if (PSCI_VERSION_MAJOR(ver) >= 1) {  in psci_probe()
527  * PSCI init function for PSCI versions >=0.2
529  * Probe based on PSCI PSCI_VERSION function
540 	 * Starting with v0.2, the PSCI specification introduced a call  in psci_0_2_init()
542 	 * that PSCI function IDs and version specific initialization  in psci_0_2_init()
550  * PSCI < v0.2 get PSCI Function IDs via DT.
561 	pr_info("Using PSCI v0.1 Function IDs from DT\n");  in psci_0_1_init()
607 	{ .compatible = "arm,psci",	.data = psci_0_1_init},
608 	{ .compatible = "arm,psci-0.2",	.data = psci_0_2_init},
609 	{ .compatible = "arm,psci-1.0",	.data = psci_1_0_init},
623 		return -ENODEV;  in psci_dt_init()
625 	init_fn = (psci_initcall_t)matched_np->data;  in psci_dt_init()
634  * We use PSCI 0.2+ when ACPI is deployed on ARM64 and it's
641 		return -EOPNOTSUPP;  in psci_acpi_init()