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;
}
/*
* 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;
}