mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-30 10:06:43 +07:00
651b1f125c
Commit 783ea7d4ee
(Driver Core: Rework platform suspend/resume, print warning)
added a warning message printed for platform drivers that use the
legacy PM callbacks rather than struct dev_pm_ops. Unfortunately,
this resulted in some confusion and made some people try to convert
drivers by replacing the old callbacks with struct dev_pm_ops in
automatic way, which generally is not a good idea.
Remove the platform device runtime dev_pm_ops warning for now,
because it's annoying to users and it's not really necessary right
now.
[rjw: Modified the changelog to be more informative.]
Signed-off-by: Magnus Damm <damm@igel.co.jp>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
1232 lines
29 KiB
C
1232 lines
29 KiB
C
/*
|
|
* platform.c - platform 'pseudo' bus for legacy devices
|
|
*
|
|
* Copyright (c) 2002-3 Patrick Mochel
|
|
* Copyright (c) 2002-3 Open Source Development Labs
|
|
*
|
|
* This file is released under the GPLv2
|
|
*
|
|
* Please see Documentation/driver-model/platform.txt for more
|
|
* information.
|
|
*/
|
|
|
|
#include <linux/platform_device.h>
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/dma-mapping.h>
|
|
#include <linux/bootmem.h>
|
|
#include <linux/err.h>
|
|
#include <linux/slab.h>
|
|
|
|
#include "base.h"
|
|
|
|
#define to_platform_driver(drv) (container_of((drv), struct platform_driver, \
|
|
driver))
|
|
|
|
struct device platform_bus = {
|
|
.init_name = "platform",
|
|
};
|
|
EXPORT_SYMBOL_GPL(platform_bus);
|
|
|
|
/**
|
|
* platform_get_resource - get a resource for a device
|
|
* @dev: platform device
|
|
* @type: resource type
|
|
* @num: resource index
|
|
*/
|
|
struct resource *platform_get_resource(struct platform_device *dev,
|
|
unsigned int type, unsigned int num)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < dev->num_resources; i++) {
|
|
struct resource *r = &dev->resource[i];
|
|
|
|
if (type == resource_type(r) && num-- == 0)
|
|
return r;
|
|
}
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(platform_get_resource);
|
|
|
|
/**
|
|
* platform_get_irq - get an IRQ for a device
|
|
* @dev: platform device
|
|
* @num: IRQ number index
|
|
*/
|
|
int platform_get_irq(struct platform_device *dev, unsigned int num)
|
|
{
|
|
struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num);
|
|
|
|
return r ? r->start : -ENXIO;
|
|
}
|
|
EXPORT_SYMBOL_GPL(platform_get_irq);
|
|
|
|
/**
|
|
* platform_get_resource_byname - get a resource for a device by name
|
|
* @dev: platform device
|
|
* @type: resource type
|
|
* @name: resource name
|
|
*/
|
|
struct resource *platform_get_resource_byname(struct platform_device *dev,
|
|
unsigned int type,
|
|
const char *name)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < dev->num_resources; i++) {
|
|
struct resource *r = &dev->resource[i];
|
|
|
|
if (type == resource_type(r) && !strcmp(r->name, name))
|
|
return r;
|
|
}
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(platform_get_resource_byname);
|
|
|
|
/**
|
|
* platform_get_irq - get an IRQ for a device
|
|
* @dev: platform device
|
|
* @name: IRQ name
|
|
*/
|
|
int platform_get_irq_byname(struct platform_device *dev, const char *name)
|
|
{
|
|
struct resource *r = platform_get_resource_byname(dev, IORESOURCE_IRQ,
|
|
name);
|
|
|
|
return r ? r->start : -ENXIO;
|
|
}
|
|
EXPORT_SYMBOL_GPL(platform_get_irq_byname);
|
|
|
|
/**
|
|
* platform_add_devices - add a numbers of platform devices
|
|
* @devs: array of platform devices to add
|
|
* @num: number of platform devices in array
|
|
*/
|
|
int platform_add_devices(struct platform_device **devs, int num)
|
|
{
|
|
int i, ret = 0;
|
|
|
|
for (i = 0; i < num; i++) {
|
|
ret = platform_device_register(devs[i]);
|
|
if (ret) {
|
|
while (--i >= 0)
|
|
platform_device_unregister(devs[i]);
|
|
break;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(platform_add_devices);
|
|
|
|
struct platform_object {
|
|
struct platform_device pdev;
|
|
char name[1];
|
|
};
|
|
|
|
/**
|
|
* platform_device_put
|
|
* @pdev: platform device to free
|
|
*
|
|
* Free all memory associated with a platform device. This function must
|
|
* _only_ be externally called in error cases. All other usage is a bug.
|
|
*/
|
|
void platform_device_put(struct platform_device *pdev)
|
|
{
|
|
if (pdev)
|
|
put_device(&pdev->dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(platform_device_put);
|
|
|
|
static void platform_device_release(struct device *dev)
|
|
{
|
|
struct platform_object *pa = container_of(dev, struct platform_object,
|
|
pdev.dev);
|
|
|
|
kfree(pa->pdev.dev.platform_data);
|
|
kfree(pa->pdev.resource);
|
|
kfree(pa);
|
|
}
|
|
|
|
/**
|
|
* platform_device_alloc
|
|
* @name: base name of the device we're adding
|
|
* @id: instance id
|
|
*
|
|
* Create a platform device object which can have other objects attached
|
|
* to it, and which will have attached objects freed when it is released.
|
|
*/
|
|
struct platform_device *platform_device_alloc(const char *name, int id)
|
|
{
|
|
struct platform_object *pa;
|
|
|
|
pa = kzalloc(sizeof(struct platform_object) + strlen(name), GFP_KERNEL);
|
|
if (pa) {
|
|
strcpy(pa->name, name);
|
|
pa->pdev.name = pa->name;
|
|
pa->pdev.id = id;
|
|
device_initialize(&pa->pdev.dev);
|
|
pa->pdev.dev.release = platform_device_release;
|
|
}
|
|
|
|
return pa ? &pa->pdev : NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(platform_device_alloc);
|
|
|
|
/**
|
|
* platform_device_add_resources
|
|
* @pdev: platform device allocated by platform_device_alloc to add resources to
|
|
* @res: set of resources that needs to be allocated for the device
|
|
* @num: number of resources
|
|
*
|
|
* Add a copy of the resources to the platform device. The memory
|
|
* associated with the resources will be freed when the platform device is
|
|
* released.
|
|
*/
|
|
int platform_device_add_resources(struct platform_device *pdev,
|
|
struct resource *res, unsigned int num)
|
|
{
|
|
struct resource *r;
|
|
|
|
r = kmalloc(sizeof(struct resource) * num, GFP_KERNEL);
|
|
if (r) {
|
|
memcpy(r, res, sizeof(struct resource) * num);
|
|
pdev->resource = r;
|
|
pdev->num_resources = num;
|
|
}
|
|
return r ? 0 : -ENOMEM;
|
|
}
|
|
EXPORT_SYMBOL_GPL(platform_device_add_resources);
|
|
|
|
/**
|
|
* platform_device_add_data
|
|
* @pdev: platform device allocated by platform_device_alloc to add resources to
|
|
* @data: platform specific data for this platform device
|
|
* @size: size of platform specific data
|
|
*
|
|
* Add a copy of platform specific data to the platform device's
|
|
* platform_data pointer. The memory associated with the platform data
|
|
* will be freed when the platform device is released.
|
|
*/
|
|
int platform_device_add_data(struct platform_device *pdev, const void *data,
|
|
size_t size)
|
|
{
|
|
void *d;
|
|
|
|
d = kmalloc(size, GFP_KERNEL);
|
|
if (d) {
|
|
memcpy(d, data, size);
|
|
pdev->dev.platform_data = d;
|
|
}
|
|
return d ? 0 : -ENOMEM;
|
|
}
|
|
EXPORT_SYMBOL_GPL(platform_device_add_data);
|
|
|
|
/**
|
|
* platform_device_add - add a platform device to device hierarchy
|
|
* @pdev: platform device we're adding
|
|
*
|
|
* This is part 2 of platform_device_register(), though may be called
|
|
* separately _iff_ pdev was allocated by platform_device_alloc().
|
|
*/
|
|
int platform_device_add(struct platform_device *pdev)
|
|
{
|
|
int i, ret = 0;
|
|
|
|
if (!pdev)
|
|
return -EINVAL;
|
|
|
|
if (!pdev->dev.parent)
|
|
pdev->dev.parent = &platform_bus;
|
|
|
|
pdev->dev.bus = &platform_bus_type;
|
|
|
|
if (pdev->id != -1)
|
|
dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id);
|
|
else
|
|
dev_set_name(&pdev->dev, "%s", pdev->name);
|
|
|
|
for (i = 0; i < pdev->num_resources; i++) {
|
|
struct resource *p, *r = &pdev->resource[i];
|
|
|
|
if (r->name == NULL)
|
|
r->name = dev_name(&pdev->dev);
|
|
|
|
p = r->parent;
|
|
if (!p) {
|
|
if (resource_type(r) == IORESOURCE_MEM)
|
|
p = &iomem_resource;
|
|
else if (resource_type(r) == IORESOURCE_IO)
|
|
p = &ioport_resource;
|
|
}
|
|
|
|
if (p && insert_resource(p, r)) {
|
|
printk(KERN_ERR
|
|
"%s: failed to claim resource %d\n",
|
|
dev_name(&pdev->dev), i);
|
|
ret = -EBUSY;
|
|
goto failed;
|
|
}
|
|
}
|
|
|
|
pr_debug("Registering platform device '%s'. Parent at %s\n",
|
|
dev_name(&pdev->dev), dev_name(pdev->dev.parent));
|
|
|
|
ret = device_add(&pdev->dev);
|
|
if (ret == 0)
|
|
return ret;
|
|
|
|
failed:
|
|
while (--i >= 0) {
|
|
struct resource *r = &pdev->resource[i];
|
|
unsigned long type = resource_type(r);
|
|
|
|
if (type == IORESOURCE_MEM || type == IORESOURCE_IO)
|
|
release_resource(r);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(platform_device_add);
|
|
|
|
/**
|
|
* platform_device_del - remove a platform-level device
|
|
* @pdev: platform device we're removing
|
|
*
|
|
* Note that this function will also release all memory- and port-based
|
|
* resources owned by the device (@dev->resource). This function must
|
|
* _only_ be externally called in error cases. All other usage is a bug.
|
|
*/
|
|
void platform_device_del(struct platform_device *pdev)
|
|
{
|
|
int i;
|
|
|
|
if (pdev) {
|
|
device_del(&pdev->dev);
|
|
|
|
for (i = 0; i < pdev->num_resources; i++) {
|
|
struct resource *r = &pdev->resource[i];
|
|
unsigned long type = resource_type(r);
|
|
|
|
if (type == IORESOURCE_MEM || type == IORESOURCE_IO)
|
|
release_resource(r);
|
|
}
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(platform_device_del);
|
|
|
|
/**
|
|
* platform_device_register - add a platform-level device
|
|
* @pdev: platform device we're adding
|
|
*/
|
|
int platform_device_register(struct platform_device *pdev)
|
|
{
|
|
device_initialize(&pdev->dev);
|
|
return platform_device_add(pdev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(platform_device_register);
|
|
|
|
/**
|
|
* platform_device_unregister - unregister a platform-level device
|
|
* @pdev: platform device we're unregistering
|
|
*
|
|
* Unregistration is done in 2 steps. First we release all resources
|
|
* and remove it from the subsystem, then we drop reference count by
|
|
* calling platform_device_put().
|
|
*/
|
|
void platform_device_unregister(struct platform_device *pdev)
|
|
{
|
|
platform_device_del(pdev);
|
|
platform_device_put(pdev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(platform_device_unregister);
|
|
|
|
/**
|
|
* platform_device_register_simple
|
|
* @name: base name of the device we're adding
|
|
* @id: instance id
|
|
* @res: set of resources that needs to be allocated for the device
|
|
* @num: number of resources
|
|
*
|
|
* This function creates a simple platform device that requires minimal
|
|
* resource and memory management. Canned release function freeing memory
|
|
* allocated for the device allows drivers using such devices to be
|
|
* unloaded without waiting for the last reference to the device to be
|
|
* dropped.
|
|
*
|
|
* This interface is primarily intended for use with legacy drivers which
|
|
* probe hardware directly. Because such drivers create sysfs device nodes
|
|
* themselves, rather than letting system infrastructure handle such device
|
|
* enumeration tasks, they don't fully conform to the Linux driver model.
|
|
* In particular, when such drivers are built as modules, they can't be
|
|
* "hotplugged".
|
|
*/
|
|
struct platform_device *platform_device_register_simple(const char *name,
|
|
int id,
|
|
struct resource *res,
|
|
unsigned int num)
|
|
{
|
|
struct platform_device *pdev;
|
|
int retval;
|
|
|
|
pdev = platform_device_alloc(name, id);
|
|
if (!pdev) {
|
|
retval = -ENOMEM;
|
|
goto error;
|
|
}
|
|
|
|
if (num) {
|
|
retval = platform_device_add_resources(pdev, res, num);
|
|
if (retval)
|
|
goto error;
|
|
}
|
|
|
|
retval = platform_device_add(pdev);
|
|
if (retval)
|
|
goto error;
|
|
|
|
return pdev;
|
|
|
|
error:
|
|
platform_device_put(pdev);
|
|
return ERR_PTR(retval);
|
|
}
|
|
EXPORT_SYMBOL_GPL(platform_device_register_simple);
|
|
|
|
/**
|
|
* platform_device_register_data
|
|
* @parent: parent device for the device we're adding
|
|
* @name: base name of the device we're adding
|
|
* @id: instance id
|
|
* @data: platform specific data for this platform device
|
|
* @size: size of platform specific data
|
|
*
|
|
* This function creates a simple platform device that requires minimal
|
|
* resource and memory management. Canned release function freeing memory
|
|
* allocated for the device allows drivers using such devices to be
|
|
* unloaded without waiting for the last reference to the device to be
|
|
* dropped.
|
|
*/
|
|
struct platform_device *platform_device_register_data(
|
|
struct device *parent,
|
|
const char *name, int id,
|
|
const void *data, size_t size)
|
|
{
|
|
struct platform_device *pdev;
|
|
int retval;
|
|
|
|
pdev = platform_device_alloc(name, id);
|
|
if (!pdev) {
|
|
retval = -ENOMEM;
|
|
goto error;
|
|
}
|
|
|
|
pdev->dev.parent = parent;
|
|
|
|
if (size) {
|
|
retval = platform_device_add_data(pdev, data, size);
|
|
if (retval)
|
|
goto error;
|
|
}
|
|
|
|
retval = platform_device_add(pdev);
|
|
if (retval)
|
|
goto error;
|
|
|
|
return pdev;
|
|
|
|
error:
|
|
platform_device_put(pdev);
|
|
return ERR_PTR(retval);
|
|
}
|
|
|
|
static int platform_drv_probe(struct device *_dev)
|
|
{
|
|
struct platform_driver *drv = to_platform_driver(_dev->driver);
|
|
struct platform_device *dev = to_platform_device(_dev);
|
|
|
|
return drv->probe(dev);
|
|
}
|
|
|
|
static int platform_drv_probe_fail(struct device *_dev)
|
|
{
|
|
return -ENXIO;
|
|
}
|
|
|
|
static int platform_drv_remove(struct device *_dev)
|
|
{
|
|
struct platform_driver *drv = to_platform_driver(_dev->driver);
|
|
struct platform_device *dev = to_platform_device(_dev);
|
|
|
|
return drv->remove(dev);
|
|
}
|
|
|
|
static void platform_drv_shutdown(struct device *_dev)
|
|
{
|
|
struct platform_driver *drv = to_platform_driver(_dev->driver);
|
|
struct platform_device *dev = to_platform_device(_dev);
|
|
|
|
drv->shutdown(dev);
|
|
}
|
|
|
|
/**
|
|
* platform_driver_register
|
|
* @drv: platform driver structure
|
|
*/
|
|
int platform_driver_register(struct platform_driver *drv)
|
|
{
|
|
drv->driver.bus = &platform_bus_type;
|
|
if (drv->probe)
|
|
drv->driver.probe = platform_drv_probe;
|
|
if (drv->remove)
|
|
drv->driver.remove = platform_drv_remove;
|
|
if (drv->shutdown)
|
|
drv->driver.shutdown = platform_drv_shutdown;
|
|
|
|
return driver_register(&drv->driver);
|
|
}
|
|
EXPORT_SYMBOL_GPL(platform_driver_register);
|
|
|
|
/**
|
|
* platform_driver_unregister
|
|
* @drv: platform driver structure
|
|
*/
|
|
void platform_driver_unregister(struct platform_driver *drv)
|
|
{
|
|
driver_unregister(&drv->driver);
|
|
}
|
|
EXPORT_SYMBOL_GPL(platform_driver_unregister);
|
|
|
|
/**
|
|
* platform_driver_probe - register driver for non-hotpluggable device
|
|
* @drv: platform driver structure
|
|
* @probe: the driver probe routine, probably from an __init section
|
|
*
|
|
* Use this instead of platform_driver_register() when you know the device
|
|
* is not hotpluggable and has already been registered, and you want to
|
|
* remove its run-once probe() infrastructure from memory after the driver
|
|
* has bound to the device.
|
|
*
|
|
* One typical use for this would be with drivers for controllers integrated
|
|
* into system-on-chip processors, where the controller devices have been
|
|
* configured as part of board setup.
|
|
*
|
|
* Returns zero if the driver registered and bound to a device, else returns
|
|
* a negative error code and with the driver not registered.
|
|
*/
|
|
int __init_or_module platform_driver_probe(struct platform_driver *drv,
|
|
int (*probe)(struct platform_device *))
|
|
{
|
|
int retval, code;
|
|
|
|
/* temporary section violation during probe() */
|
|
drv->probe = probe;
|
|
retval = code = platform_driver_register(drv);
|
|
|
|
/* Fixup that section violation, being paranoid about code scanning
|
|
* the list of drivers in order to probe new devices. Check to see
|
|
* if the probe was successful, and make sure any forced probes of
|
|
* new devices fail.
|
|
*/
|
|
spin_lock(&platform_bus_type.p->klist_drivers.k_lock);
|
|
drv->probe = NULL;
|
|
if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list))
|
|
retval = -ENODEV;
|
|
drv->driver.probe = platform_drv_probe_fail;
|
|
spin_unlock(&platform_bus_type.p->klist_drivers.k_lock);
|
|
|
|
if (code != retval)
|
|
platform_driver_unregister(drv);
|
|
return retval;
|
|
}
|
|
EXPORT_SYMBOL_GPL(platform_driver_probe);
|
|
|
|
/* modalias support enables more hands-off userspace setup:
|
|
* (a) environment variable lets new-style hotplug events work once system is
|
|
* fully running: "modprobe $MODALIAS"
|
|
* (b) sysfs attribute lets new-style coldplug recover from hotplug events
|
|
* mishandled before system is fully running: "modprobe $(cat modalias)"
|
|
*/
|
|
static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
|
|
char *buf)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
int len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name);
|
|
|
|
return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
|
|
}
|
|
|
|
static struct device_attribute platform_dev_attrs[] = {
|
|
__ATTR_RO(modalias),
|
|
__ATTR_NULL,
|
|
};
|
|
|
|
static int platform_uevent(struct device *dev, struct kobj_uevent_env *env)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
|
|
add_uevent_var(env, "MODALIAS=%s%s", PLATFORM_MODULE_PREFIX,
|
|
(pdev->id_entry) ? pdev->id_entry->name : pdev->name);
|
|
return 0;
|
|
}
|
|
|
|
static const struct platform_device_id *platform_match_id(
|
|
struct platform_device_id *id,
|
|
struct platform_device *pdev)
|
|
{
|
|
while (id->name[0]) {
|
|
if (strcmp(pdev->name, id->name) == 0) {
|
|
pdev->id_entry = id;
|
|
return id;
|
|
}
|
|
id++;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* platform_match - bind platform device to platform driver.
|
|
* @dev: device.
|
|
* @drv: driver.
|
|
*
|
|
* Platform device IDs are assumed to be encoded like this:
|
|
* "<name><instance>", where <name> is a short description of the type of
|
|
* device, like "pci" or "floppy", and <instance> is the enumerated
|
|
* instance of the device, like '0' or '42'. Driver IDs are simply
|
|
* "<name>". So, extract the <name> from the platform_device structure,
|
|
* and compare it against the name of the driver. Return whether they match
|
|
* or not.
|
|
*/
|
|
static int platform_match(struct device *dev, struct device_driver *drv)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
struct platform_driver *pdrv = to_platform_driver(drv);
|
|
|
|
/* match against the id table first */
|
|
if (pdrv->id_table)
|
|
return platform_match_id(pdrv->id_table, pdev) != NULL;
|
|
|
|
/* fall-back to driver name match */
|
|
return (strcmp(pdev->name, drv->name) == 0);
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
|
|
static int platform_legacy_suspend(struct device *dev, pm_message_t mesg)
|
|
{
|
|
struct platform_driver *pdrv = to_platform_driver(dev->driver);
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
int ret = 0;
|
|
|
|
if (dev->driver && pdrv->suspend)
|
|
ret = pdrv->suspend(pdev, mesg);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int platform_legacy_suspend_late(struct device *dev, pm_message_t mesg)
|
|
{
|
|
struct platform_driver *pdrv = to_platform_driver(dev->driver);
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
int ret = 0;
|
|
|
|
if (dev->driver && pdrv->suspend_late)
|
|
ret = pdrv->suspend_late(pdev, mesg);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int platform_legacy_resume_early(struct device *dev)
|
|
{
|
|
struct platform_driver *pdrv = to_platform_driver(dev->driver);
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
int ret = 0;
|
|
|
|
if (dev->driver && pdrv->resume_early)
|
|
ret = pdrv->resume_early(pdev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int platform_legacy_resume(struct device *dev)
|
|
{
|
|
struct platform_driver *pdrv = to_platform_driver(dev->driver);
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
int ret = 0;
|
|
|
|
if (dev->driver && pdrv->resume)
|
|
ret = pdrv->resume(pdev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int platform_pm_prepare(struct device *dev)
|
|
{
|
|
struct device_driver *drv = dev->driver;
|
|
int ret = 0;
|
|
|
|
if (drv && drv->pm && drv->pm->prepare)
|
|
ret = drv->pm->prepare(dev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void platform_pm_complete(struct device *dev)
|
|
{
|
|
struct device_driver *drv = dev->driver;
|
|
|
|
if (drv && drv->pm && drv->pm->complete)
|
|
drv->pm->complete(dev);
|
|
}
|
|
|
|
#ifdef CONFIG_SUSPEND
|
|
|
|
static int platform_pm_suspend(struct device *dev)
|
|
{
|
|
struct device_driver *drv = dev->driver;
|
|
int ret = 0;
|
|
|
|
if (!drv)
|
|
return 0;
|
|
|
|
if (drv->pm) {
|
|
if (drv->pm->suspend)
|
|
ret = drv->pm->suspend(dev);
|
|
} else {
|
|
ret = platform_legacy_suspend(dev, PMSG_SUSPEND);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int platform_pm_suspend_noirq(struct device *dev)
|
|
{
|
|
struct device_driver *drv = dev->driver;
|
|
int ret = 0;
|
|
|
|
if (!drv)
|
|
return 0;
|
|
|
|
if (drv->pm) {
|
|
if (drv->pm->suspend_noirq)
|
|
ret = drv->pm->suspend_noirq(dev);
|
|
} else {
|
|
ret = platform_legacy_suspend_late(dev, PMSG_SUSPEND);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int platform_pm_resume(struct device *dev)
|
|
{
|
|
struct device_driver *drv = dev->driver;
|
|
int ret = 0;
|
|
|
|
if (!drv)
|
|
return 0;
|
|
|
|
if (drv->pm) {
|
|
if (drv->pm->resume)
|
|
ret = drv->pm->resume(dev);
|
|
} else {
|
|
ret = platform_legacy_resume(dev);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int platform_pm_resume_noirq(struct device *dev)
|
|
{
|
|
struct device_driver *drv = dev->driver;
|
|
int ret = 0;
|
|
|
|
if (!drv)
|
|
return 0;
|
|
|
|
if (drv->pm) {
|
|
if (drv->pm->resume_noirq)
|
|
ret = drv->pm->resume_noirq(dev);
|
|
} else {
|
|
ret = platform_legacy_resume_early(dev);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
#else /* !CONFIG_SUSPEND */
|
|
|
|
#define platform_pm_suspend NULL
|
|
#define platform_pm_resume NULL
|
|
#define platform_pm_suspend_noirq NULL
|
|
#define platform_pm_resume_noirq NULL
|
|
|
|
#endif /* !CONFIG_SUSPEND */
|
|
|
|
#ifdef CONFIG_HIBERNATION
|
|
|
|
static int platform_pm_freeze(struct device *dev)
|
|
{
|
|
struct device_driver *drv = dev->driver;
|
|
int ret = 0;
|
|
|
|
if (!drv)
|
|
return 0;
|
|
|
|
if (drv->pm) {
|
|
if (drv->pm->freeze)
|
|
ret = drv->pm->freeze(dev);
|
|
} else {
|
|
ret = platform_legacy_suspend(dev, PMSG_FREEZE);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int platform_pm_freeze_noirq(struct device *dev)
|
|
{
|
|
struct device_driver *drv = dev->driver;
|
|
int ret = 0;
|
|
|
|
if (!drv)
|
|
return 0;
|
|
|
|
if (drv->pm) {
|
|
if (drv->pm->freeze_noirq)
|
|
ret = drv->pm->freeze_noirq(dev);
|
|
} else {
|
|
ret = platform_legacy_suspend_late(dev, PMSG_FREEZE);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int platform_pm_thaw(struct device *dev)
|
|
{
|
|
struct device_driver *drv = dev->driver;
|
|
int ret = 0;
|
|
|
|
if (!drv)
|
|
return 0;
|
|
|
|
if (drv->pm) {
|
|
if (drv->pm->thaw)
|
|
ret = drv->pm->thaw(dev);
|
|
} else {
|
|
ret = platform_legacy_resume(dev);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int platform_pm_thaw_noirq(struct device *dev)
|
|
{
|
|
struct device_driver *drv = dev->driver;
|
|
int ret = 0;
|
|
|
|
if (!drv)
|
|
return 0;
|
|
|
|
if (drv->pm) {
|
|
if (drv->pm->thaw_noirq)
|
|
ret = drv->pm->thaw_noirq(dev);
|
|
} else {
|
|
ret = platform_legacy_resume_early(dev);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int platform_pm_poweroff(struct device *dev)
|
|
{
|
|
struct device_driver *drv = dev->driver;
|
|
int ret = 0;
|
|
|
|
if (!drv)
|
|
return 0;
|
|
|
|
if (drv->pm) {
|
|
if (drv->pm->poweroff)
|
|
ret = drv->pm->poweroff(dev);
|
|
} else {
|
|
ret = platform_legacy_suspend(dev, PMSG_HIBERNATE);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int platform_pm_poweroff_noirq(struct device *dev)
|
|
{
|
|
struct device_driver *drv = dev->driver;
|
|
int ret = 0;
|
|
|
|
if (!drv)
|
|
return 0;
|
|
|
|
if (drv->pm) {
|
|
if (drv->pm->poweroff_noirq)
|
|
ret = drv->pm->poweroff_noirq(dev);
|
|
} else {
|
|
ret = platform_legacy_suspend_late(dev, PMSG_HIBERNATE);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int platform_pm_restore(struct device *dev)
|
|
{
|
|
struct device_driver *drv = dev->driver;
|
|
int ret = 0;
|
|
|
|
if (!drv)
|
|
return 0;
|
|
|
|
if (drv->pm) {
|
|
if (drv->pm->restore)
|
|
ret = drv->pm->restore(dev);
|
|
} else {
|
|
ret = platform_legacy_resume(dev);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int platform_pm_restore_noirq(struct device *dev)
|
|
{
|
|
struct device_driver *drv = dev->driver;
|
|
int ret = 0;
|
|
|
|
if (!drv)
|
|
return 0;
|
|
|
|
if (drv->pm) {
|
|
if (drv->pm->restore_noirq)
|
|
ret = drv->pm->restore_noirq(dev);
|
|
} else {
|
|
ret = platform_legacy_resume_early(dev);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
#else /* !CONFIG_HIBERNATION */
|
|
|
|
#define platform_pm_freeze NULL
|
|
#define platform_pm_thaw NULL
|
|
#define platform_pm_poweroff NULL
|
|
#define platform_pm_restore NULL
|
|
#define platform_pm_freeze_noirq NULL
|
|
#define platform_pm_thaw_noirq NULL
|
|
#define platform_pm_poweroff_noirq NULL
|
|
#define platform_pm_restore_noirq NULL
|
|
|
|
#endif /* !CONFIG_HIBERNATION */
|
|
|
|
static struct dev_pm_ops platform_dev_pm_ops = {
|
|
.prepare = platform_pm_prepare,
|
|
.complete = platform_pm_complete,
|
|
.suspend = platform_pm_suspend,
|
|
.resume = platform_pm_resume,
|
|
.freeze = platform_pm_freeze,
|
|
.thaw = platform_pm_thaw,
|
|
.poweroff = platform_pm_poweroff,
|
|
.restore = platform_pm_restore,
|
|
.suspend_noirq = platform_pm_suspend_noirq,
|
|
.resume_noirq = platform_pm_resume_noirq,
|
|
.freeze_noirq = platform_pm_freeze_noirq,
|
|
.thaw_noirq = platform_pm_thaw_noirq,
|
|
.poweroff_noirq = platform_pm_poweroff_noirq,
|
|
.restore_noirq = platform_pm_restore_noirq,
|
|
};
|
|
|
|
#define PLATFORM_PM_OPS_PTR (&platform_dev_pm_ops)
|
|
|
|
#else /* !CONFIG_PM_SLEEP */
|
|
|
|
#define PLATFORM_PM_OPS_PTR NULL
|
|
|
|
#endif /* !CONFIG_PM_SLEEP */
|
|
|
|
struct bus_type platform_bus_type = {
|
|
.name = "platform",
|
|
.dev_attrs = platform_dev_attrs,
|
|
.match = platform_match,
|
|
.uevent = platform_uevent,
|
|
.pm = PLATFORM_PM_OPS_PTR,
|
|
};
|
|
EXPORT_SYMBOL_GPL(platform_bus_type);
|
|
|
|
int __init platform_bus_init(void)
|
|
{
|
|
int error;
|
|
|
|
early_platform_cleanup();
|
|
|
|
error = device_register(&platform_bus);
|
|
if (error)
|
|
return error;
|
|
error = bus_register(&platform_bus_type);
|
|
if (error)
|
|
device_unregister(&platform_bus);
|
|
return error;
|
|
}
|
|
|
|
#ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
|
|
u64 dma_get_required_mask(struct device *dev)
|
|
{
|
|
u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT);
|
|
u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT));
|
|
u64 mask;
|
|
|
|
if (!high_totalram) {
|
|
/* convert to mask just covering totalram */
|
|
low_totalram = (1 << (fls(low_totalram) - 1));
|
|
low_totalram += low_totalram - 1;
|
|
mask = low_totalram;
|
|
} else {
|
|
high_totalram = (1 << (fls(high_totalram) - 1));
|
|
high_totalram += high_totalram - 1;
|
|
mask = (((u64)high_totalram) << 32) + 0xffffffff;
|
|
}
|
|
return mask;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dma_get_required_mask);
|
|
#endif
|
|
|
|
static __initdata LIST_HEAD(early_platform_driver_list);
|
|
static __initdata LIST_HEAD(early_platform_device_list);
|
|
|
|
/**
|
|
* early_platform_driver_register
|
|
* @epdrv: early_platform driver structure
|
|
* @buf: string passed from early_param()
|
|
*/
|
|
int __init early_platform_driver_register(struct early_platform_driver *epdrv,
|
|
char *buf)
|
|
{
|
|
unsigned long index;
|
|
int n;
|
|
|
|
/* Simply add the driver to the end of the global list.
|
|
* Drivers will by default be put on the list in compiled-in order.
|
|
*/
|
|
if (!epdrv->list.next) {
|
|
INIT_LIST_HEAD(&epdrv->list);
|
|
list_add_tail(&epdrv->list, &early_platform_driver_list);
|
|
}
|
|
|
|
/* If the user has specified device then make sure the driver
|
|
* gets prioritized. The driver of the last device specified on
|
|
* command line will be put first on the list.
|
|
*/
|
|
n = strlen(epdrv->pdrv->driver.name);
|
|
if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) {
|
|
list_move(&epdrv->list, &early_platform_driver_list);
|
|
|
|
if (!strcmp(buf, epdrv->pdrv->driver.name))
|
|
epdrv->requested_id = -1;
|
|
else if (buf[n] == '.' && strict_strtoul(&buf[n + 1], 10,
|
|
&index) == 0)
|
|
epdrv->requested_id = index;
|
|
else
|
|
epdrv->requested_id = EARLY_PLATFORM_ID_ERROR;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* early_platform_add_devices - add a numbers of early platform devices
|
|
* @devs: array of early platform devices to add
|
|
* @num: number of early platform devices in array
|
|
*/
|
|
void __init early_platform_add_devices(struct platform_device **devs, int num)
|
|
{
|
|
struct device *dev;
|
|
int i;
|
|
|
|
/* simply add the devices to list */
|
|
for (i = 0; i < num; i++) {
|
|
dev = &devs[i]->dev;
|
|
|
|
if (!dev->devres_head.next) {
|
|
INIT_LIST_HEAD(&dev->devres_head);
|
|
list_add_tail(&dev->devres_head,
|
|
&early_platform_device_list);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* early_platform_driver_register_all
|
|
* @class_str: string to identify early platform driver class
|
|
*/
|
|
void __init early_platform_driver_register_all(char *class_str)
|
|
{
|
|
/* The "class_str" parameter may or may not be present on the kernel
|
|
* command line. If it is present then there may be more than one
|
|
* matching parameter.
|
|
*
|
|
* Since we register our early platform drivers using early_param()
|
|
* we need to make sure that they also get registered in the case
|
|
* when the parameter is missing from the kernel command line.
|
|
*
|
|
* We use parse_early_options() to make sure the early_param() gets
|
|
* called at least once. The early_param() may be called more than
|
|
* once since the name of the preferred device may be specified on
|
|
* the kernel command line. early_platform_driver_register() handles
|
|
* this case for us.
|
|
*/
|
|
parse_early_options(class_str);
|
|
}
|
|
|
|
/**
|
|
* early_platform_match
|
|
* @epdrv: early platform driver structure
|
|
* @id: id to match against
|
|
*/
|
|
static __init struct platform_device *
|
|
early_platform_match(struct early_platform_driver *epdrv, int id)
|
|
{
|
|
struct platform_device *pd;
|
|
|
|
list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
|
|
if (platform_match(&pd->dev, &epdrv->pdrv->driver))
|
|
if (pd->id == id)
|
|
return pd;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* early_platform_left
|
|
* @epdrv: early platform driver structure
|
|
* @id: return true if id or above exists
|
|
*/
|
|
static __init int early_platform_left(struct early_platform_driver *epdrv,
|
|
int id)
|
|
{
|
|
struct platform_device *pd;
|
|
|
|
list_for_each_entry(pd, &early_platform_device_list, dev.devres_head)
|
|
if (platform_match(&pd->dev, &epdrv->pdrv->driver))
|
|
if (pd->id >= id)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* early_platform_driver_probe_id
|
|
* @class_str: string to identify early platform driver class
|
|
* @id: id to match against
|
|
* @nr_probe: number of platform devices to successfully probe before exiting
|
|
*/
|
|
static int __init early_platform_driver_probe_id(char *class_str,
|
|
int id,
|
|
int nr_probe)
|
|
{
|
|
struct early_platform_driver *epdrv;
|
|
struct platform_device *match;
|
|
int match_id;
|
|
int n = 0;
|
|
int left = 0;
|
|
|
|
list_for_each_entry(epdrv, &early_platform_driver_list, list) {
|
|
/* only use drivers matching our class_str */
|
|
if (strcmp(class_str, epdrv->class_str))
|
|
continue;
|
|
|
|
if (id == -2) {
|
|
match_id = epdrv->requested_id;
|
|
left = 1;
|
|
|
|
} else {
|
|
match_id = id;
|
|
left += early_platform_left(epdrv, id);
|
|
|
|
/* skip requested id */
|
|
switch (epdrv->requested_id) {
|
|
case EARLY_PLATFORM_ID_ERROR:
|
|
case EARLY_PLATFORM_ID_UNSET:
|
|
break;
|
|
default:
|
|
if (epdrv->requested_id == id)
|
|
match_id = EARLY_PLATFORM_ID_UNSET;
|
|
}
|
|
}
|
|
|
|
switch (match_id) {
|
|
case EARLY_PLATFORM_ID_ERROR:
|
|
pr_warning("%s: unable to parse %s parameter\n",
|
|
class_str, epdrv->pdrv->driver.name);
|
|
/* fall-through */
|
|
case EARLY_PLATFORM_ID_UNSET:
|
|
match = NULL;
|
|
break;
|
|
default:
|
|
match = early_platform_match(epdrv, match_id);
|
|
}
|
|
|
|
if (match) {
|
|
if (epdrv->pdrv->probe(match))
|
|
pr_warning("%s: unable to probe %s early.\n",
|
|
class_str, match->name);
|
|
else
|
|
n++;
|
|
}
|
|
|
|
if (n >= nr_probe)
|
|
break;
|
|
}
|
|
|
|
if (left)
|
|
return n;
|
|
else
|
|
return -ENODEV;
|
|
}
|
|
|
|
/**
|
|
* early_platform_driver_probe
|
|
* @class_str: string to identify early platform driver class
|
|
* @nr_probe: number of platform devices to successfully probe before exiting
|
|
* @user_only: only probe user specified early platform devices
|
|
*/
|
|
int __init early_platform_driver_probe(char *class_str,
|
|
int nr_probe,
|
|
int user_only)
|
|
{
|
|
int k, n, i;
|
|
|
|
n = 0;
|
|
for (i = -2; n < nr_probe; i++) {
|
|
k = early_platform_driver_probe_id(class_str, i, nr_probe - n);
|
|
|
|
if (k < 0)
|
|
break;
|
|
|
|
n += k;
|
|
|
|
if (user_only)
|
|
break;
|
|
}
|
|
|
|
return n;
|
|
}
|
|
|
|
/**
|
|
* early_platform_cleanup - clean up early platform code
|
|
*/
|
|
void __init early_platform_cleanup(void)
|
|
{
|
|
struct platform_device *pd, *pd2;
|
|
|
|
/* clean up the devres list used to chain devices */
|
|
list_for_each_entry_safe(pd, pd2, &early_platform_device_list,
|
|
dev.devres_head) {
|
|
list_del(&pd->dev.devres_head);
|
|
memset(&pd->dev.devres_head, 0, sizeof(pd->dev.devres_head));
|
|
}
|
|
}
|
|
|