1 // SPDX-License-Identifier: GPL-2.0-only
3  * CPU idle driver for Tegra CPUs
5  * Copyright (c) 2010-2013, NVIDIA Corporation.
15 #define pr_fmt(fmt)	"tegra-cpuidle: " fmt
26 #include <linux/clk/tegra.h>
29 #include <soc/tegra/cpuidle.h>
30 #include <soc/tegra/flowctrl.h>
31 #include <soc/tegra/fuse.h>
32 #include <soc/tegra/irq.h>
33 #include <soc/tegra/pm.h>
34 #include <soc/tegra/pmc.h>
68 	while (retries--) {  in tegra_cpuidle_wait_for_secondary_cpus_parking()
74 		 * shutdown in order to power-off CPU's cluster safely.  in tegra_cpuidle_wait_for_secondary_cpus_parking()
76 		 * it takes about 40-150us in average and over 1000us in  in tegra_cpuidle_wait_for_secondary_cpus_parking()
85 		} while (timeout_us--);  in tegra_cpuidle_wait_for_secondary_cpus_parking()
94 	return -ETIMEDOUT;  in tegra_cpuidle_wait_for_secondary_cpus_parking()
134 	if (err && err != -ENOSYS)  in tegra_cpuidle_c7_enter()
157 		return -EINTR;  in tegra_cpuidle_coupled_barrier()
169 	 * CC6 state is the "CPU cluster power-off" state.  In order to  in tegra_cpuidle_state_enter()
198 		err = -EINVAL;  in tegra_cpuidle_state_enter()
214 	 * On Tegra30 CPU0 can't be power-gated separately from secondary  in tegra_cpuidle_adjust_state_index()
233 	bool do_rcu = drv->states[index].flags & CPUIDLE_FLAG_RCU_IDLE;  in tegra_cpuidle_enter()
234 	unsigned int cpu = cpu_logical_map(dev->cpu);  in tegra_cpuidle_enter()
238 	if (dev->states_usage[index].disable)  in tegra_cpuidle_enter()
239 		return -1;  in tegra_cpuidle_enter()
251 		if (ret != -EINTR || index != TEGRA_CC6)  in tegra_cpuidle_enter()
254 		index = -1;  in tegra_cpuidle_enter()
272  * The previous versions of Tegra CPUIDLE driver used a different "legacy"
279  * ---------
332 	if ((state_cc6->flags & CPUIDLE_FLAG_UNUSABLE) ||  in tegra_cpuidle_pcie_irqs_in_use()
344 	s->enter_s2idle = tegra114_enter_s2idle;  in tegra_cpuidle_setup_tegra114_c7_state()
345 	s->target_residency = 1000;  in tegra_cpuidle_setup_tegra114_c7_state()
346 	s->exit_latency = 500;  in tegra_cpuidle_setup_tegra114_c7_state()
352 		return -EPROBE_DEFER;  in tegra_cpuidle_probe()
354 	/* LP2 could be disabled in device-tree */  in tegra_cpuidle_probe()
359 	 * Required suspend-resume functionality, which is provided by the  in tegra_cpuidle_probe()
360 	 * Tegra-arch core and PMC driver, is unavailable if PM-sleep option  in tegra_cpuidle_probe()
370 	 * cluster power-off (CC6 or LP2) states are common for all Tegra SoCs.  in tegra_cpuidle_probe()
374 		/* Tegra20 isn't capable to power-off individual CPU cores */  in tegra_cpuidle_probe()
390 		return -EINVAL;  in tegra_cpuidle_probe()
399 		.name = "tegra-cpuidle",