Esempio n. 1
0
static int __init bl_idle_init(void)
{
	int ret;
	struct device_node *root = of_find_node_by_path("/");

	if (!root)
		return -ENODEV;

	/*
	 * Initialize the driver just for a compliant set of machines
	 */
	if (!of_match_node(compatible_machine_match, root))
		return -ENODEV;
	/*
	 * For now the differentiation between little and big cores
	 * is based on the part number. A7 cores are considered little
	 * cores, A15 are considered big cores. This distinction may
	 * evolve in the future with a more generic matching approach.
	 */
	ret = bl_idle_driver_init(&bl_idle_little_driver,
				  ARM_CPU_PART_CORTEX_A7);
	if (ret)
		return ret;

	ret = bl_idle_driver_init(&bl_idle_big_driver, ARM_CPU_PART_CORTEX_A15);
	if (ret)
		goto out_uninit_little;

	/* Start at index 1, index 0 standard WFI */
	ret = dt_init_idle_driver(&bl_idle_big_driver, bl_idle_state_match, 1);
	if (ret < 0)
		goto out_uninit_big;

	/* Start at index 1, index 0 standard WFI */
	ret = dt_init_idle_driver(&bl_idle_little_driver,
				  bl_idle_state_match, 1);
	if (ret < 0)
		goto out_uninit_big;

	ret = cpuidle_register(&bl_idle_little_driver, NULL);
	if (ret)
		goto out_uninit_big;

	ret = cpuidle_register(&bl_idle_big_driver, NULL);
	if (ret)
		goto out_unregister_little;

	return 0;

out_unregister_little:
	cpuidle_unregister(&bl_idle_little_driver);
out_uninit_big:
	kfree(bl_idle_big_driver.cpumask);
out_uninit_little:
	kfree(bl_idle_little_driver.cpumask);

	return ret;
}
Esempio n. 2
0
/*
 * arm64_idle_init
 *
 * Registers the arm64 specific cpuidle driver with the cpuidle
 * framework. It relies on core code to parse the idle states
 * and initialize them using driver data structures accordingly.
 */
static int __init arm64_idle_init(void)
{
	int cpu, ret;
	struct cpuidle_driver *drv = &arm64_idle_driver;

	/*
	 * Initialize idle states data, starting at index 1.
	 * This driver is DT only, if no DT idle states are detected (ret == 0)
	 * let the driver initialization fail accordingly since there is no
	 * reason to initialize the idle driver if only wfi is supported.
	 */
	ret = dt_init_idle_driver(drv, arm64_idle_state_match, 1);
	if (ret <= 0) {
		if (ret)
			pr_err("failed to initialize idle states\n");
		return ret ? : -ENODEV;
	}

	/*
	 * Call arch CPU operations in order to initialize
	 * idle states suspend back-end specific data
	 */
	for_each_possible_cpu(cpu) {
		ret = cpu_init_idle(cpu);
		if (ret) {
			pr_err("CPU %d failed to init idle CPU ops\n", cpu);
			return ret;
		}
	}

	ret = cpuidle_register(drv, NULL);
	if (ret) {
		pr_err("failed to register cpuidle driver\n");
		return ret;
	}

	return 0;
}