14 #define pr_fmt(fmt) "psci: " fmt
17 #include <linux/arm-smccc.h>
24 #include <linux/psci.h>
27 #include <linux/suspend.h>
29 #include <uapi/linux/psci.h>
35 #include <asm/suspend.h>
38  * While a 64-bit OS can make calls with SMC32 calling conventions, for some
39  * calls it is necessary to use SMC64 to pass or return 64-bit values.
41  * (native-width) function ID.
52  * a Trusted OS even if it claims to be capable of migration -- doing so will
55 static int resident_cpu = -1;
142 		return -EOPNOTSUPP;  in psci_to_linux_errno()
145 		return -EINVAL;  in psci_to_linux_errno()
147 		return -EPERM;  in psci_to_linux_errno()
150 	return -EINVAL;  in psci_to_linux_errno()
226 		WARN(1, "Unexpected PSCI conduit %d\n", conduit);  in set_conduit()
240 		return -ENXIO;  in get_set_conduit_method()
249 		return -EINVAL;  in get_set_conduit_method()
280 	while ((state_node = of_parse_phandle(cpu_node, "cpu-idle-states",  in psci_dt_cpu_init_idle()
287 		return -ENODEV;  in psci_dt_cpu_init_idle()
291 		return -ENOMEM;  in psci_dt_cpu_init_idle()
296 		state_node = of_parse_phandle(cpu_node, "cpu-idle-states", i);  in psci_dt_cpu_init_idle()
299 					   "arm,psci-suspend-param",  in psci_dt_cpu_init_idle()
302 			pr_warn(" * %pOF missing arm,psci-suspend-param property\n",  in psci_dt_cpu_init_idle()
309 		pr_debug("psci-power-state %#x index %d\n", state, i);  in psci_dt_cpu_init_idle()
311 			pr_warn("Invalid PSCI power state %#x\n", state);  in psci_dt_cpu_init_idle()
312 			ret = -EINVAL;  in psci_dt_cpu_init_idle()
317 	/* Idle states parsed correctly, initialize per-cpu pointer */  in psci_dt_cpu_init_idle()
336 	if (unlikely(!pr || !pr->flags.has_lpi))  in psci_acpi_cpu_init_idle()
337 		return -EINVAL;  in psci_acpi_cpu_init_idle()
339 	count = pr->power.count - 1;  in psci_acpi_cpu_init_idle()
341 		return -ENODEV;  in psci_acpi_cpu_init_idle()
345 		return -ENOMEM;  in psci_acpi_cpu_init_idle()
350 		lpi = &pr->power.lpi_states[i + 1];  in psci_acpi_cpu_init_idle()
352 		 * Only bits[31:0] represent a PSCI power_state while  in psci_acpi_cpu_init_idle()
355 		state = lpi->address;  in psci_acpi_cpu_init_idle()
357 			pr_warn("Invalid PSCI power state %#x\n", state);  in psci_acpi_cpu_init_idle()
359 			return -EINVAL;  in psci_acpi_cpu_init_idle()
363 	/* Idle states parsed correctly, initialize per-cpu pointer */  in psci_acpi_cpu_init_idle()
370 	return -EINVAL;  in psci_acpi_cpu_init_idle()
380 	 * If the PSCI cpu_suspend function hook has not been initialized  in psci_cpu_init_idle()
384 		return -EOPNOTSUPP;  in psci_cpu_init_idle()
391 		return -ENODEV;  in psci_cpu_init_idle()
404 	return psci_ops.cpu_suspend(state[index - 1],  in psci_suspend_finisher()
417 		return -EINVAL;  in psci_cpu_suspend_enter()
419 	if (!psci_power_state_loses_context(state[index - 1]))  in psci_cpu_suspend_enter()
420 		ret = psci_ops.cpu_suspend(state[index - 1], 0);  in psci_cpu_suspend_enter()
430 	.suspend = psci_cpu_suspend_enter,
434 CPUIDLE_METHOD_OF_DECLARE(psci, "psci", &psci_cpuidle_ops);
482 	int type, cpu = -1;  in psci_init_migrate()
510 	resident_cpu = cpu >= 0 ? cpu : -1;  in psci_init_migrate()
532 	 * Conveniently, the SMCCC and PSCI versions are encoded the  in psci_init_smccc()
542 	pr_info("Using standard PSCI v0.2 function IDs\n");  in psci_0_2_set_functions()
568  * Probe function for PSCI firmware versions >= 0.2
579 		pr_err("Conflicting PSCI version detected.\n");  in psci_probe()
580 		return -EINVAL;  in psci_probe()
599  * PSCI init function for PSCI versions >=0.2
601  * Probe based on PSCI PSCI_VERSION function
612 	 * Starting with v0.2, the PSCI specification introduced a call  in psci_0_2_init()
614 	 * that PSCI function IDs and version specific initialization  in psci_0_2_init()
626  * PSCI < v0.2 get PSCI Function IDs via DT.
638 	pr_info("Using PSCI v0.1 Function IDs from DT\n");  in psci_0_1_init()
666 	{ .compatible = "arm,psci",	.data = psci_0_1_init},
667 	{ .compatible = "arm,psci-0.2",	.data = psci_0_2_init},
668 	{ .compatible = "arm,psci-1.0",	.data = psci_0_2_init},
681 		return -ENODEV;  in psci_dt_init()
683 	init_fn = (psci_initcall_t)matched_np->data;  in psci_dt_init()
689  * We use PSCI 0.2+ when ACPI is deployed on ARM64 and it's
696 		return -EOPNOTSUPP;  in psci_acpi_init()