mirror of https://gitee.com/openkylin/linux.git
445 lines
11 KiB
C
445 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* drivers/mfd/mfd-core.c
|
|
*
|
|
* core MFD support
|
|
* Copyright (c) 2006 Ian Molton
|
|
* Copyright (c) 2007,2008 Dmitry Baryshkov
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/acpi.h>
|
|
#include <linux/list.h>
|
|
#include <linux/property.h>
|
|
#include <linux/mfd/core.h>
|
|
#include <linux/pm_runtime.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/module.h>
|
|
#include <linux/irqdomain.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/regulator/consumer.h>
|
|
|
|
static LIST_HEAD(mfd_of_node_list);
|
|
|
|
struct mfd_of_node_entry {
|
|
struct list_head list;
|
|
struct device *dev;
|
|
struct device_node *np;
|
|
};
|
|
|
|
static struct device_type mfd_dev_type = {
|
|
.name = "mfd_device",
|
|
};
|
|
|
|
int mfd_cell_enable(struct platform_device *pdev)
|
|
{
|
|
const struct mfd_cell *cell = mfd_get_cell(pdev);
|
|
|
|
if (!cell->enable) {
|
|
dev_dbg(&pdev->dev, "No .enable() call-back registered\n");
|
|
return 0;
|
|
}
|
|
|
|
return cell->enable(pdev);
|
|
}
|
|
EXPORT_SYMBOL(mfd_cell_enable);
|
|
|
|
int mfd_cell_disable(struct platform_device *pdev)
|
|
{
|
|
const struct mfd_cell *cell = mfd_get_cell(pdev);
|
|
|
|
if (!cell->disable) {
|
|
dev_dbg(&pdev->dev, "No .disable() call-back registered\n");
|
|
return 0;
|
|
}
|
|
|
|
return cell->disable(pdev);
|
|
}
|
|
EXPORT_SYMBOL(mfd_cell_disable);
|
|
|
|
#if IS_ENABLED(CONFIG_ACPI)
|
|
static void mfd_acpi_add_device(const struct mfd_cell *cell,
|
|
struct platform_device *pdev)
|
|
{
|
|
const struct mfd_cell_acpi_match *match = cell->acpi_match;
|
|
struct acpi_device *parent, *child;
|
|
struct acpi_device *adev;
|
|
|
|
parent = ACPI_COMPANION(pdev->dev.parent);
|
|
if (!parent)
|
|
return;
|
|
|
|
/*
|
|
* MFD child device gets its ACPI handle either from the ACPI device
|
|
* directly under the parent that matches the either _HID or _CID, or
|
|
* _ADR or it will use the parent handle if is no ID is given.
|
|
*
|
|
* Note that use of _ADR is a grey area in the ACPI specification,
|
|
* though Intel Galileo Gen2 is using it to distinguish the children
|
|
* devices.
|
|
*/
|
|
adev = parent;
|
|
if (match) {
|
|
if (match->pnpid) {
|
|
struct acpi_device_id ids[2] = {};
|
|
|
|
strlcpy(ids[0].id, match->pnpid, sizeof(ids[0].id));
|
|
list_for_each_entry(child, &parent->children, node) {
|
|
if (!acpi_match_device_ids(child, ids)) {
|
|
adev = child;
|
|
break;
|
|
}
|
|
}
|
|
} else {
|
|
unsigned long long adr;
|
|
acpi_status status;
|
|
|
|
list_for_each_entry(child, &parent->children, node) {
|
|
status = acpi_evaluate_integer(child->handle,
|
|
"_ADR", NULL,
|
|
&adr);
|
|
if (ACPI_SUCCESS(status) && match->adr == adr) {
|
|
adev = child;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
ACPI_COMPANION_SET(&pdev->dev, adev);
|
|
}
|
|
#else
|
|
static inline void mfd_acpi_add_device(const struct mfd_cell *cell,
|
|
struct platform_device *pdev)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
static int mfd_match_of_node_to_dev(struct platform_device *pdev,
|
|
struct device_node *np,
|
|
const struct mfd_cell *cell)
|
|
{
|
|
#if IS_ENABLED(CONFIG_OF)
|
|
struct mfd_of_node_entry *of_entry;
|
|
const __be32 *reg;
|
|
u64 of_node_addr;
|
|
|
|
/* Skip devices 'disabled' by Device Tree */
|
|
if (!of_device_is_available(np))
|
|
return -ENODEV;
|
|
|
|
/* Skip if OF node has previously been allocated to a device */
|
|
list_for_each_entry(of_entry, &mfd_of_node_list, list)
|
|
if (of_entry->np == np)
|
|
return -EAGAIN;
|
|
|
|
if (!cell->use_of_reg)
|
|
/* No of_reg defined - allocate first free compatible match */
|
|
goto allocate_of_node;
|
|
|
|
/* We only care about each node's first defined address */
|
|
reg = of_get_address(np, 0, NULL, NULL);
|
|
if (!reg)
|
|
/* OF node does not contatin a 'reg' property to match to */
|
|
return -EAGAIN;
|
|
|
|
of_node_addr = of_read_number(reg, of_n_addr_cells(np));
|
|
|
|
if (cell->of_reg != of_node_addr)
|
|
/* No match */
|
|
return -EAGAIN;
|
|
|
|
allocate_of_node:
|
|
of_entry = kzalloc(sizeof(*of_entry), GFP_KERNEL);
|
|
if (!of_entry)
|
|
return -ENOMEM;
|
|
|
|
of_entry->dev = &pdev->dev;
|
|
of_entry->np = np;
|
|
list_add_tail(&of_entry->list, &mfd_of_node_list);
|
|
|
|
pdev->dev.of_node = np;
|
|
pdev->dev.fwnode = &np->fwnode;
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
static int mfd_add_device(struct device *parent, int id,
|
|
const struct mfd_cell *cell,
|
|
struct resource *mem_base,
|
|
int irq_base, struct irq_domain *domain)
|
|
{
|
|
struct resource *res;
|
|
struct platform_device *pdev;
|
|
struct device_node *np = NULL;
|
|
struct mfd_of_node_entry *of_entry, *tmp;
|
|
int ret = -ENOMEM;
|
|
int platform_id;
|
|
int r;
|
|
|
|
if (id == PLATFORM_DEVID_AUTO)
|
|
platform_id = id;
|
|
else
|
|
platform_id = id + cell->id;
|
|
|
|
pdev = platform_device_alloc(cell->name, platform_id);
|
|
if (!pdev)
|
|
goto fail_alloc;
|
|
|
|
pdev->mfd_cell = kmemdup(cell, sizeof(*cell), GFP_KERNEL);
|
|
if (!pdev->mfd_cell)
|
|
goto fail_device;
|
|
|
|
res = kcalloc(cell->num_resources, sizeof(*res), GFP_KERNEL);
|
|
if (!res)
|
|
goto fail_device;
|
|
|
|
pdev->dev.parent = parent;
|
|
pdev->dev.type = &mfd_dev_type;
|
|
pdev->dev.dma_mask = parent->dma_mask;
|
|
pdev->dev.dma_parms = parent->dma_parms;
|
|
pdev->dev.coherent_dma_mask = parent->coherent_dma_mask;
|
|
|
|
ret = regulator_bulk_register_supply_alias(
|
|
&pdev->dev, cell->parent_supplies,
|
|
parent, cell->parent_supplies,
|
|
cell->num_parent_supplies);
|
|
if (ret < 0)
|
|
goto fail_res;
|
|
|
|
if (IS_ENABLED(CONFIG_OF) && parent->of_node && cell->of_compatible) {
|
|
for_each_child_of_node(parent->of_node, np) {
|
|
if (of_device_is_compatible(np, cell->of_compatible)) {
|
|
ret = mfd_match_of_node_to_dev(pdev, np, cell);
|
|
if (ret == -EAGAIN)
|
|
continue;
|
|
if (ret)
|
|
goto fail_alias;
|
|
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!pdev->dev.of_node)
|
|
pr_warn("%s: Failed to locate of_node [id: %d]\n",
|
|
cell->name, platform_id);
|
|
}
|
|
|
|
mfd_acpi_add_device(cell, pdev);
|
|
|
|
if (cell->pdata_size) {
|
|
ret = platform_device_add_data(pdev,
|
|
cell->platform_data, cell->pdata_size);
|
|
if (ret)
|
|
goto fail_of_entry;
|
|
}
|
|
|
|
if (cell->properties) {
|
|
ret = platform_device_add_properties(pdev, cell->properties);
|
|
if (ret)
|
|
goto fail_of_entry;
|
|
}
|
|
|
|
for (r = 0; r < cell->num_resources; r++) {
|
|
res[r].name = cell->resources[r].name;
|
|
res[r].flags = cell->resources[r].flags;
|
|
|
|
/* Find out base to use */
|
|
if ((cell->resources[r].flags & IORESOURCE_MEM) && mem_base) {
|
|
res[r].parent = mem_base;
|
|
res[r].start = mem_base->start +
|
|
cell->resources[r].start;
|
|
res[r].end = mem_base->start +
|
|
cell->resources[r].end;
|
|
} else if (cell->resources[r].flags & IORESOURCE_IRQ) {
|
|
if (domain) {
|
|
/* Unable to create mappings for IRQ ranges. */
|
|
WARN_ON(cell->resources[r].start !=
|
|
cell->resources[r].end);
|
|
res[r].start = res[r].end = irq_create_mapping(
|
|
domain, cell->resources[r].start);
|
|
} else {
|
|
res[r].start = irq_base +
|
|
cell->resources[r].start;
|
|
res[r].end = irq_base +
|
|
cell->resources[r].end;
|
|
}
|
|
} else {
|
|
res[r].parent = cell->resources[r].parent;
|
|
res[r].start = cell->resources[r].start;
|
|
res[r].end = cell->resources[r].end;
|
|
}
|
|
|
|
if (!cell->ignore_resource_conflicts) {
|
|
if (has_acpi_companion(&pdev->dev)) {
|
|
ret = acpi_check_resource_conflict(&res[r]);
|
|
if (ret)
|
|
goto fail_of_entry;
|
|
}
|
|
}
|
|
}
|
|
|
|
ret = platform_device_add_resources(pdev, res, cell->num_resources);
|
|
if (ret)
|
|
goto fail_of_entry;
|
|
|
|
ret = platform_device_add(pdev);
|
|
if (ret)
|
|
goto fail_of_entry;
|
|
|
|
if (cell->pm_runtime_no_callbacks)
|
|
pm_runtime_no_callbacks(&pdev->dev);
|
|
|
|
kfree(res);
|
|
|
|
return 0;
|
|
|
|
fail_of_entry:
|
|
list_for_each_entry_safe(of_entry, tmp, &mfd_of_node_list, list)
|
|
if (of_entry->dev == &pdev->dev) {
|
|
list_del(&of_entry->list);
|
|
kfree(of_entry);
|
|
}
|
|
fail_alias:
|
|
regulator_bulk_unregister_supply_alias(&pdev->dev,
|
|
cell->parent_supplies,
|
|
cell->num_parent_supplies);
|
|
fail_res:
|
|
kfree(res);
|
|
fail_device:
|
|
platform_device_put(pdev);
|
|
fail_alloc:
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* mfd_add_devices - register child devices
|
|
*
|
|
* @parent: Pointer to parent device.
|
|
* @id: Can be PLATFORM_DEVID_AUTO to let the Platform API take care
|
|
* of device numbering, or will be added to a device's cell_id.
|
|
* @cells: Array of (struct mfd_cell)s describing child devices.
|
|
* @n_devs: Number of child devices to register.
|
|
* @mem_base: Parent register range resource for child devices.
|
|
* @irq_base: Base of the range of virtual interrupt numbers allocated for
|
|
* this MFD device. Unused if @domain is specified.
|
|
* @domain: Interrupt domain to create mappings for hardware interrupts.
|
|
*/
|
|
int mfd_add_devices(struct device *parent, int id,
|
|
const struct mfd_cell *cells, int n_devs,
|
|
struct resource *mem_base,
|
|
int irq_base, struct irq_domain *domain)
|
|
{
|
|
int i;
|
|
int ret;
|
|
|
|
for (i = 0; i < n_devs; i++) {
|
|
ret = mfd_add_device(parent, id, cells + i, mem_base,
|
|
irq_base, domain);
|
|
if (ret)
|
|
goto fail;
|
|
}
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
if (i)
|
|
mfd_remove_devices(parent);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(mfd_add_devices);
|
|
|
|
static int mfd_remove_devices_fn(struct device *dev, void *data)
|
|
{
|
|
struct platform_device *pdev;
|
|
const struct mfd_cell *cell;
|
|
int *level = data;
|
|
|
|
if (dev->type != &mfd_dev_type)
|
|
return 0;
|
|
|
|
pdev = to_platform_device(dev);
|
|
cell = mfd_get_cell(pdev);
|
|
|
|
if (level && cell->level > *level)
|
|
return 0;
|
|
|
|
regulator_bulk_unregister_supply_alias(dev, cell->parent_supplies,
|
|
cell->num_parent_supplies);
|
|
|
|
kfree(cell);
|
|
|
|
platform_device_unregister(pdev);
|
|
return 0;
|
|
}
|
|
|
|
void mfd_remove_devices_late(struct device *parent)
|
|
{
|
|
int level = MFD_DEP_LEVEL_HIGH;
|
|
|
|
device_for_each_child_reverse(parent, &level, mfd_remove_devices_fn);
|
|
}
|
|
EXPORT_SYMBOL(mfd_remove_devices_late);
|
|
|
|
void mfd_remove_devices(struct device *parent)
|
|
{
|
|
int level = MFD_DEP_LEVEL_NORMAL;
|
|
|
|
device_for_each_child_reverse(parent, &level, mfd_remove_devices_fn);
|
|
}
|
|
EXPORT_SYMBOL(mfd_remove_devices);
|
|
|
|
static void devm_mfd_dev_release(struct device *dev, void *res)
|
|
{
|
|
mfd_remove_devices(dev);
|
|
}
|
|
|
|
/**
|
|
* devm_mfd_add_devices - Resource managed version of mfd_add_devices()
|
|
*
|
|
* Returns 0 on success or an appropriate negative error number on failure.
|
|
* All child-devices of the MFD will automatically be removed when it gets
|
|
* unbinded.
|
|
*
|
|
* @dev: Pointer to parent device.
|
|
* @id: Can be PLATFORM_DEVID_AUTO to let the Platform API take care
|
|
* of device numbering, or will be added to a device's cell_id.
|
|
* @cells: Array of (struct mfd_cell)s describing child devices.
|
|
* @n_devs: Number of child devices to register.
|
|
* @mem_base: Parent register range resource for child devices.
|
|
* @irq_base: Base of the range of virtual interrupt numbers allocated for
|
|
* this MFD device. Unused if @domain is specified.
|
|
* @domain: Interrupt domain to create mappings for hardware interrupts.
|
|
*/
|
|
int devm_mfd_add_devices(struct device *dev, int id,
|
|
const struct mfd_cell *cells, int n_devs,
|
|
struct resource *mem_base,
|
|
int irq_base, struct irq_domain *domain)
|
|
{
|
|
struct device **ptr;
|
|
int ret;
|
|
|
|
ptr = devres_alloc(devm_mfd_dev_release, sizeof(*ptr), GFP_KERNEL);
|
|
if (!ptr)
|
|
return -ENOMEM;
|
|
|
|
ret = mfd_add_devices(dev, id, cells, n_devs, mem_base,
|
|
irq_base, domain);
|
|
if (ret < 0) {
|
|
devres_free(ptr);
|
|
return ret;
|
|
}
|
|
|
|
*ptr = dev;
|
|
devres_add(dev, ptr);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(devm_mfd_add_devices);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov");
|