Lines Matching +full:cpu +full:- +full:idle +full:- +full:states
1 // SPDX-License-Identifier: GPL-2.0-only
3 * PSCI CPU idle driver.
30 #include "cpuidle-psci.h"
62 u32 *states = data->psci_states; in __psci_enter_domain_idle_state() local
63 struct device *pd_dev = data->dev; in __psci_enter_domain_idle_state()
69 return -1; in __psci_enter_domain_idle_state()
72 /* Do runtime PM to manage a hierarchical CPU toplogy. */ in __psci_enter_domain_idle_state()
85 state = states[idx]; in __psci_enter_domain_idle_state()
87 ret = psci_cpu_suspend_enter(state) ? -1 : idx; in __psci_enter_domain_idle_state()
101 /* Clear the domain state to start fresh when back from idle. */ in __psci_enter_domain_idle_state()
119 static int psci_idle_cpuhp_up(unsigned int cpu) in psci_idle_cpuhp_up() argument
129 static int psci_idle_cpuhp_down(unsigned int cpu) in psci_idle_cpuhp_down() argument
166 { .compatible = "arm,idle-state",
173 int err = of_property_read_u32(np, "arm,psci-suspend-param", state); in psci_dt_parse_state_node()
176 pr_warn("%pOF missing arm,psci-suspend-param property\n", np); in psci_dt_parse_state_node()
182 return -EINVAL; in psci_dt_parse_state_node()
190 unsigned int state_count, int cpu) in psci_dt_cpu_init_topology() argument
196 data->dev = psci_dt_attach_cpu(cpu); in psci_dt_cpu_init_topology()
197 if (IS_ERR_OR_NULL(data->dev)) in psci_dt_cpu_init_topology()
198 return PTR_ERR_OR_ZERO(data->dev); in psci_dt_cpu_init_topology()
201 * Using the deepest state for the CPU to trigger a potential selection in psci_dt_cpu_init_topology()
202 * of a shared state for the domain, assumes the domain states are all in psci_dt_cpu_init_topology()
203 * deeper states. in psci_dt_cpu_init_topology()
205 drv->states[state_count - 1].enter = psci_enter_domain_idle_state; in psci_dt_cpu_init_topology()
206 drv->states[state_count - 1].enter_s2idle = psci_enter_s2idle_domain_idle_state; in psci_dt_cpu_init_topology()
214 unsigned int state_count, int cpu) in psci_dt_cpu_init_idle() argument
219 struct psci_cpuidle_data *data = per_cpu_ptr(&psci_cpuidle_data, cpu); in psci_dt_cpu_init_idle()
225 return -ENOMEM; in psci_dt_cpu_init_idle()
228 state_node = of_get_cpu_state_node(cpu_node, i - 1); in psci_dt_cpu_init_idle()
238 pr_debug("psci-power-state %#x index %d\n", psci_states[i], i); in psci_dt_cpu_init_idle()
242 return -ENODEV; in psci_dt_cpu_init_idle()
245 ret = psci_dt_cpu_init_topology(drv, data, state_count, cpu); in psci_dt_cpu_init_idle()
249 /* Idle states parsed correctly, store them in the per-cpu struct. */ in psci_dt_cpu_init_idle()
250 data->psci_states = psci_states; in psci_dt_cpu_init_idle()
255 unsigned int cpu, unsigned int state_count) in psci_cpu_init_idle() argument
262 * idle states must not be enabled, so bail out in psci_cpu_init_idle()
265 return -EOPNOTSUPP; in psci_cpu_init_idle()
267 cpu_node = of_cpu_device_node_get(cpu); in psci_cpu_init_idle()
269 return -ENODEV; in psci_cpu_init_idle()
271 ret = psci_dt_cpu_init_idle(dev, drv, cpu_node, state_count, cpu); in psci_cpu_init_idle()
278 static void psci_cpu_deinit_idle(int cpu) in psci_cpu_deinit_idle() argument
280 struct psci_cpuidle_data *data = per_cpu_ptr(&psci_cpuidle_data, cpu); in psci_cpu_deinit_idle()
282 psci_dt_detach_cpu(data->dev); in psci_cpu_deinit_idle()
286 static int psci_idle_init_cpu(struct device *dev, int cpu) in psci_idle_init_cpu() argument
293 cpu_node = of_cpu_device_node_get(cpu); in psci_idle_init_cpu()
295 return -ENODEV; in psci_idle_init_cpu()
298 * Check whether the enable-method for the cpu is PSCI, fail in psci_idle_init_cpu()
301 enable_method = of_get_property(cpu_node, "enable-method", NULL); in psci_idle_init_cpu()
303 ret = -ENODEV; in psci_idle_init_cpu()
311 return -ENOMEM; in psci_idle_init_cpu()
313 drv->name = "psci_idle"; in psci_idle_init_cpu()
314 drv->owner = THIS_MODULE; in psci_idle_init_cpu()
315 drv->cpumask = (struct cpumask *)cpumask_of(cpu); in psci_idle_init_cpu()
318 * PSCI idle states relies on architectural WFI to be represented as in psci_idle_init_cpu()
321 drv->states[0].enter = psci_enter_idle_state; in psci_idle_init_cpu()
322 drv->states[0].exit_latency = 1; in psci_idle_init_cpu()
323 drv->states[0].target_residency = 1; in psci_idle_init_cpu()
324 drv->states[0].power_usage = UINT_MAX; in psci_idle_init_cpu()
325 strcpy(drv->states[0].name, "WFI"); in psci_idle_init_cpu()
326 strcpy(drv->states[0].desc, "ARM WFI"); in psci_idle_init_cpu()
329 * If no DT idle states are detected (ret == 0) let the driver in psci_idle_init_cpu()
331 * initialize the idle driver if only wfi is supported, the in psci_idle_init_cpu()
332 * default archictectural back-end already executes wfi in psci_idle_init_cpu()
333 * on idle entry. in psci_idle_init_cpu()
337 return ret ? : -ENODEV; in psci_idle_init_cpu()
340 * Initialize PSCI idle states. in psci_idle_init_cpu()
342 ret = psci_cpu_init_idle(dev, drv, cpu, ret); in psci_idle_init_cpu()
344 pr_err("CPU %d failed to PSCI idle\n", cpu); in psci_idle_init_cpu()
356 psci_cpu_deinit_idle(cpu); in psci_idle_init_cpu()
361 * psci_idle_probe - Initializes PSCI cpuidle driver
363 * Initializes PSCI cpuidle driver for all CPUs, if any CPU fails
369 int cpu, ret; in psci_cpuidle_probe() local
373 for_each_possible_cpu(cpu) { in psci_cpuidle_probe()
374 ret = psci_idle_init_cpu(&pdev->dev, cpu); in psci_cpuidle_probe()
383 while (--cpu >= 0) { in psci_cpuidle_probe()
384 dev = per_cpu(cpuidle_devices, cpu); in psci_cpuidle_probe()
387 psci_cpu_deinit_idle(cpu); in psci_cpuidle_probe()
396 .name = "psci-cpuidle",
409 pdev = platform_device_register_simple("psci-cpuidle", -1, NULL, 0); in psci_idle_init()