mirror of
https://github.com/torvalds/linux.git
synced 2025-11-04 02:30:34 +02:00
ec7a7aa9a4
Now that of_cpu_device_node_get() is defined in of.h, of_device.h is just implicitly including other includes, and is no longer needed. Just drop including of_device.h as of.h is already included. Link: https://lore.kernel.org/r/20230329-dt-cpu-header-cleanups-v1-7-581e2605fe47@kernel.org Signed-off-by: Rob Herring <robh@kernel.org>
148 lines
4 KiB
C
148 lines
4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* Copyright 2012 Linaro Ltd.
|
|
*/
|
|
|
|
#include <linux/cpuidle.h>
|
|
#include <linux/of.h>
|
|
#include <asm/cpuidle.h>
|
|
|
|
extern struct of_cpuidle_method __cpuidle_method_of_table[];
|
|
|
|
static const struct of_cpuidle_method __cpuidle_method_of_table_sentinel
|
|
__used __section("__cpuidle_method_of_table_end");
|
|
|
|
static struct cpuidle_ops cpuidle_ops[NR_CPUS] __ro_after_init;
|
|
|
|
/**
|
|
* arm_cpuidle_simple_enter() - a wrapper to cpu_do_idle()
|
|
* @dev: not used
|
|
* @drv: not used
|
|
* @index: not used
|
|
*
|
|
* A trivial wrapper to allow the cpu_do_idle function to be assigned as a
|
|
* cpuidle callback by matching the function signature.
|
|
*
|
|
* Returns the index passed as parameter
|
|
*/
|
|
__cpuidle int arm_cpuidle_simple_enter(struct cpuidle_device *dev, struct
|
|
cpuidle_driver *drv, int index)
|
|
{
|
|
cpu_do_idle();
|
|
|
|
return index;
|
|
}
|
|
|
|
/**
|
|
* arm_cpuidle_suspend() - function to enter low power idle states
|
|
* @index: an integer used as an identifier for the low level PM callbacks
|
|
*
|
|
* This function calls the underlying arch specific low level PM code as
|
|
* registered at the init time.
|
|
*
|
|
* Returns the result of the suspend callback.
|
|
*/
|
|
int arm_cpuidle_suspend(int index)
|
|
{
|
|
int cpu = smp_processor_id();
|
|
|
|
return cpuidle_ops[cpu].suspend(index);
|
|
}
|
|
|
|
/**
|
|
* arm_cpuidle_get_ops() - find a registered cpuidle_ops by name
|
|
* @method: the method name
|
|
*
|
|
* Search in the __cpuidle_method_of_table array the cpuidle ops matching the
|
|
* method name.
|
|
*
|
|
* Returns a struct cpuidle_ops pointer, NULL if not found.
|
|
*/
|
|
static const struct cpuidle_ops *__init arm_cpuidle_get_ops(const char *method)
|
|
{
|
|
struct of_cpuidle_method *m = __cpuidle_method_of_table;
|
|
|
|
for (; m->method; m++)
|
|
if (!strcmp(m->method, method))
|
|
return m->ops;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* arm_cpuidle_read_ops() - Initialize the cpuidle ops with the device tree
|
|
* @dn: a pointer to a struct device node corresponding to a cpu node
|
|
* @cpu: the cpu identifier
|
|
*
|
|
* Get the method name defined in the 'enable-method' property, retrieve the
|
|
* associated cpuidle_ops and do a struct copy. This copy is needed because all
|
|
* cpuidle_ops are tagged __initconst and will be unloaded after the init
|
|
* process.
|
|
*
|
|
* Return 0 on sucess, -ENOENT if no 'enable-method' is defined, -EOPNOTSUPP if
|
|
* no cpuidle_ops is registered for the 'enable-method', or if either init or
|
|
* suspend callback isn't defined.
|
|
*/
|
|
static int __init arm_cpuidle_read_ops(struct device_node *dn, int cpu)
|
|
{
|
|
const char *enable_method;
|
|
const struct cpuidle_ops *ops;
|
|
|
|
enable_method = of_get_property(dn, "enable-method", NULL);
|
|
if (!enable_method)
|
|
return -ENOENT;
|
|
|
|
ops = arm_cpuidle_get_ops(enable_method);
|
|
if (!ops) {
|
|
pr_warn("%pOF: unsupported enable-method property: %s\n",
|
|
dn, enable_method);
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
if (!ops->init || !ops->suspend) {
|
|
pr_warn("cpuidle_ops '%s': no init or suspend callback\n",
|
|
enable_method);
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
cpuidle_ops[cpu] = *ops; /* structure copy */
|
|
|
|
pr_notice("cpuidle: enable-method property '%s'"
|
|
" found operations\n", enable_method);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* arm_cpuidle_init() - Initialize cpuidle_ops for a specific cpu
|
|
* @cpu: the cpu to be initialized
|
|
*
|
|
* Initialize the cpuidle ops with the device for the cpu and then call
|
|
* the cpu's idle initialization callback. This may fail if the underlying HW
|
|
* is not operational.
|
|
*
|
|
* Returns:
|
|
* 0 on success,
|
|
* -ENODEV if it fails to find the cpu node in the device tree,
|
|
* -EOPNOTSUPP if it does not find a registered and valid cpuidle_ops for
|
|
* this cpu,
|
|
* -ENOENT if it fails to find an 'enable-method' property,
|
|
* -ENXIO if the HW reports a failure or a misconfiguration,
|
|
* -ENOMEM if the HW report an memory allocation failure
|
|
*/
|
|
int __init arm_cpuidle_init(int cpu)
|
|
{
|
|
struct device_node *cpu_node = of_cpu_device_node_get(cpu);
|
|
int ret;
|
|
|
|
if (!cpu_node)
|
|
return -ENODEV;
|
|
|
|
ret = arm_cpuidle_read_ops(cpu_node, cpu);
|
|
if (!ret)
|
|
ret = cpuidle_ops[cpu].init(cpu_node, cpu);
|
|
|
|
of_node_put(cpu_node);
|
|
|
|
return ret;
|
|
}
|