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Thomas Gleixnerd2912cb2019-06-04 10:11:33 +02001// SPDX-License-Identifier: GPL-2.0-only
Mika Westerberg91e56872012-10-31 22:45:02 +01002/*
3 * ACPI support for platform bus type.
4 *
5 * Copyright (C) 2012, Intel Corporation
6 * Authors: Mika Westerberg <mika.westerberg@linux.intel.com>
7 * Mathias Nyman <mathias.nyman@linux.intel.com>
8 * Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Mika Westerberg91e56872012-10-31 22:45:02 +01009 */
10
11#include <linux/acpi.h>
12#include <linux/device.h>
Mika Westerberge3753252013-01-18 13:46:01 +000013#include <linux/err.h>
Mika Westerberg91e56872012-10-31 22:45:02 +010014#include <linux/kernel.h>
15#include <linux/module.h>
Heikki Krogerus8a2f38d2014-09-24 11:00:37 +030016#include <linux/dma-mapping.h>
Mika Westerberga252d882016-09-15 11:07:04 +030017#include <linux/pci.h>
Mika Westerberg91e56872012-10-31 22:45:02 +010018#include <linux/platform_device.h>
19
Andy Shevchenko5923f982012-11-26 10:35:07 +010020#include "internal.h"
21
Mika Westerberg91e56872012-10-31 22:45:02 +010022ACPI_MODULE_NAME("platform");
23
Zhang Rui48459342014-05-30 14:35:34 +020024static const struct acpi_device_id forbidden_id_list[] = {
Joerg Roedel08f63d92017-03-22 18:33:25 +010025 {"PNP0000", 0}, /* PIC */
26 {"PNP0100", 0}, /* Timer */
27 {"PNP0200", 0}, /* AT DMA Controller */
28 {"ACPI0009", 0}, /* IOxAPIC */
29 {"ACPI000A", 0}, /* IOAPIC */
Hans de Goede2bbb5fa2018-11-19 19:06:01 +010030 {"SMB0001", 0}, /* ACPI SMBUS virtual device */
Zhang Rui48459342014-05-30 14:35:34 +020031 {"", 0},
Rafael J. Wysocki141a2972013-01-30 14:27:40 +010032};
33
Mika Westerberga252d882016-09-15 11:07:04 +030034static void acpi_platform_fill_resource(struct acpi_device *adev,
35 const struct resource *src, struct resource *dest)
36{
37 struct device *parent;
38
39 *dest = *src;
40
41 /*
42 * If the device has parent we need to take its resources into
43 * account as well because this device might consume part of those.
44 */
45 parent = acpi_get_first_physical_node(adev->parent);
46 if (parent && dev_is_pci(parent))
47 dest->parent = pci_find_resource(to_pci_dev(parent), dest);
48}
49
Mika Westerberg91e56872012-10-31 22:45:02 +010050/**
51 * acpi_create_platform_device - Create platform device for ACPI device node
52 * @adev: ACPI device node to create a platform device for.
Heikki Krogerus15718752016-11-03 16:21:26 +020053 * @properties: Optional collection of build-in properties.
Mika Westerberg91e56872012-10-31 22:45:02 +010054 *
55 * Check if the given @adev can be represented as a platform device and, if
56 * that's the case, create and register a platform device, populate its common
57 * resources and returns a pointer to it. Otherwise, return %NULL.
58 *
Mika Westerberg7eaa2802013-01-18 14:09:35 +000059 * Name of the platform device will be the same as @adev's.
Mika Westerberg91e56872012-10-31 22:45:02 +010060 */
Heikki Krogerus15718752016-11-03 16:21:26 +020061struct platform_device *acpi_create_platform_device(struct acpi_device *adev,
62 struct property_entry *properties)
Mika Westerberg91e56872012-10-31 22:45:02 +010063{
64 struct platform_device *pdev = NULL;
Rafael J. Wysocki863f9f32012-11-21 00:21:59 +010065 struct platform_device_info pdevinfo;
Jiang Liu90e97822015-02-05 13:44:43 +080066 struct resource_entry *rentry;
Rafael J. Wysocki8e345c92012-11-15 00:30:21 +010067 struct list_head resource_list;
Kuppuswamy Sathyanarayanan62eb4b02013-07-22 16:51:20 -070068 struct resource *resources = NULL;
Rafael J. Wysocki8e345c92012-11-15 00:30:21 +010069 int count;
Mika Westerberg91e56872012-10-31 22:45:02 +010070
71 /* If the ACPI node already has a physical device attached, skip it. */
72 if (adev->physical_node_count)
Rafael J. Wysocki8ce62f82014-05-25 14:38:52 +020073 return NULL;
Mika Westerberg91e56872012-10-31 22:45:02 +010074
Zhang Rui48459342014-05-30 14:35:34 +020075 if (!acpi_match_device_ids(adev, forbidden_id_list))
76 return ERR_PTR(-EINVAL);
77
Rafael J. Wysocki8e345c92012-11-15 00:30:21 +010078 INIT_LIST_HEAD(&resource_list);
79 count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
Rafael J. Wysockid2fe7252013-08-07 01:11:33 +020080 if (count < 0) {
Rafael J. Wysocki8ce62f82014-05-25 14:38:52 +020081 return NULL;
Rafael J. Wysockid2fe7252013-08-07 01:11:33 +020082 } else if (count > 0) {
Kees Cook6396bb22018-06-12 14:03:40 -070083 resources = kcalloc(count, sizeof(struct resource),
Rafael J. Wysockid2fe7252013-08-07 01:11:33 +020084 GFP_KERNEL);
85 if (!resources) {
86 dev_err(&adev->dev, "No memory for resources\n");
87 acpi_dev_free_resource_list(&resource_list);
Rafael J. Wysocki8ce62f82014-05-25 14:38:52 +020088 return ERR_PTR(-ENOMEM);
Rafael J. Wysockid2fe7252013-08-07 01:11:33 +020089 }
90 count = 0;
91 list_for_each_entry(rentry, &resource_list, node)
Mika Westerberga252d882016-09-15 11:07:04 +030092 acpi_platform_fill_resource(adev, rentry->res,
93 &resources[count++]);
Mika Westerberg91e56872012-10-31 22:45:02 +010094
Rafael J. Wysocki8e345c92012-11-15 00:30:21 +010095 acpi_dev_free_resource_list(&resource_list);
Mika Westerberg91e56872012-10-31 22:45:02 +010096 }
97
Rafael J. Wysocki863f9f32012-11-21 00:21:59 +010098 memset(&pdevinfo, 0, sizeof(pdevinfo));
Mika Westerberg91e56872012-10-31 22:45:02 +010099 /*
100 * If the ACPI node has a parent and that parent has a physical device
101 * attached to it, that physical device should be the parent of the
102 * platform device we are about to create.
103 */
Aleksey Makarov3b95bd12016-02-16 15:52:38 +0300104 pdevinfo.parent = adev->parent ?
105 acpi_get_first_physical_node(adev->parent) : NULL;
Rafael J. Wysocki863f9f32012-11-21 00:21:59 +0100106 pdevinfo.name = dev_name(&adev->dev);
107 pdevinfo.id = -1;
108 pdevinfo.res = resources;
109 pdevinfo.num_res = count;
Rafael J. Wysockice793482015-03-16 23:49:03 +0100110 pdevinfo.fwnode = acpi_fwnode_handle(adev);
Heikki Krogerus15718752016-11-03 16:21:26 +0200111 pdevinfo.properties = properties;
Suthikulpanit, Suravee1831eff2015-10-28 15:50:50 -0700112
113 if (acpi_dma_supported(adev))
114 pdevinfo.dma_mask = DMA_BIT_MASK(32);
115 else
116 pdevinfo.dma_mask = 0;
117
Rafael J. Wysocki863f9f32012-11-21 00:21:59 +0100118 pdev = platform_device_register_full(&pdevinfo);
Rafael J. Wysocki8ce62f82014-05-25 14:38:52 +0200119 if (IS_ERR(pdev))
Mika Westerberg91e56872012-10-31 22:45:02 +0100120 dev_err(&adev->dev, "platform device creation failed: %ld\n",
121 PTR_ERR(pdev));
Shanker Donthineni79f97c32017-03-29 06:39:19 -0500122 else {
123 set_dev_node(&pdev->dev, acpi_get_node(adev->handle));
Mika Westerberg91e56872012-10-31 22:45:02 +0100124 dev_dbg(&adev->dev, "created platform device %s\n",
125 dev_name(&pdev->dev));
Shanker Donthineni79f97c32017-03-29 06:39:19 -0500126 }
Mika Westerberg91e56872012-10-31 22:45:02 +0100127
Rafael J. Wysocki8e345c92012-11-15 00:30:21 +0100128 kfree(resources);
Shanker Donthineni79f97c32017-03-29 06:39:19 -0500129
Rafael J. Wysocki8ce62f82014-05-25 14:38:52 +0200130 return pdev;
131}
Zhang Rui083bf662014-03-14 14:06:25 +0800132EXPORT_SYMBOL_GPL(acpi_create_platform_device);