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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * (c) Copyright 2003, 2006 Hewlett-Packard Development Company, L.P.
4 * Alex Williamson <alex.williamson@hp.com>
5 * Bjorn Helgaas <bjorn.helgaas@hp.com>
6 */
7
8#include <linux/module.h>
9#include <linux/types.h>
10#include <linux/slab.h>
11#include <linux/acpi.h>
12
13#include <asm/acpi-ext.h>
14
15/*
16 * Device CSRs that do not appear in PCI config space should be described
17 * via ACPI. This would normally be done with Address Space Descriptors
18 * marked as "consumer-only," but old versions of Windows and Linux ignore
19 * the producer/consumer flag, so HP invented a vendor-defined resource to
20 * describe the location and size of CSR space.
21 */
22
23struct acpi_vendor_uuid hp_ccsr_uuid = {
24 .subtype = 2,
25 .data = { 0xf9, 0xad, 0xe9, 0x69, 0x4f, 0x92, 0x5f, 0xab, 0xf6, 0x4a,
26 0x24, 0xd2, 0x01, 0x37, 0x0e, 0xad },
27};
28
29static acpi_status hp_ccsr_locate(acpi_handle obj, u64 *base, u64 *length)
30{
31 acpi_status status;
32 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
33 struct acpi_resource *resource;
34 struct acpi_resource_vendor_typed *vendor;
35
36 status = acpi_get_vendor_resource(obj, METHOD_NAME__CRS, &hp_ccsr_uuid,
37 &buffer);
38
39 resource = buffer.pointer;
40 vendor = &resource->data.vendor_typed;
41
42 if (ACPI_FAILURE(status) || vendor->byte_length < 16) {
43 status = AE_NOT_FOUND;
44 goto exit;
45 }
46
47 memcpy(base, vendor->byte_data, sizeof(*base));
48 memcpy(length, vendor->byte_data + 8, sizeof(*length));
49
50 exit:
51 kfree(buffer.pointer);
52 return status;
53}
54
55struct csr_space {
56 u64 base;
57 u64 length;
58};
59
60static acpi_status find_csr_space(struct acpi_resource *resource, void *data)
61{
62 struct csr_space *space = data;
63 struct acpi_resource_address64 addr;
64 acpi_status status;
65
66 status = acpi_resource_to_address64(resource, &addr);
67 if (ACPI_SUCCESS(status) &&
68 addr.resource_type == ACPI_MEMORY_RANGE &&
69 addr.address.address_length &&
70 addr.producer_consumer == ACPI_CONSUMER) {
71 space->base = addr.address.minimum;
72 space->length = addr.address.address_length;
73 return AE_CTRL_TERMINATE;
74 }
75 return AE_OK; /* keep looking */
76}
77
78static acpi_status hp_crs_locate(acpi_handle obj, u64 *base, u64 *length)
79{
80 struct csr_space space = { 0, 0 };
81
82 acpi_walk_resources(obj, METHOD_NAME__CRS, find_csr_space, &space);
83 if (!space.length)
84 return AE_NOT_FOUND;
85
86 *base = space.base;
87 *length = space.length;
88 return AE_OK;
89}
90
91acpi_status hp_acpi_csr_space(acpi_handle obj, u64 *csr_base, u64 *csr_length)
92{
93 acpi_status status;
94
95 status = hp_ccsr_locate(obj, csr_base, csr_length);
96 if (ACPI_SUCCESS(status))
97 return status;
98
99 return hp_crs_locate(obj, csr_base, csr_length);
100}
101EXPORT_SYMBOL(hp_acpi_csr_space);
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * (c) Copyright 2003, 2006 Hewlett-Packard Development Company, L.P.
4 * Alex Williamson <alex.williamson@hp.com>
5 * Bjorn Helgaas <bjorn.helgaas@hp.com>
6 */
7
8#include <linux/module.h>
9#include <linux/types.h>
10#include <linux/slab.h>
11#include <linux/acpi.h>
12
13#include <asm/acpi-ext.h>
14
15/*
16 * Device CSRs that do not appear in PCI config space should be described
17 * via ACPI. This would normally be done with Address Space Descriptors
18 * marked as "consumer-only," but old versions of Windows and Linux ignore
19 * the producer/consumer flag, so HP invented a vendor-defined resource to
20 * describe the location and size of CSR space.
21 */
22
23struct acpi_vendor_uuid hp_ccsr_uuid = {
24 .subtype = 2,
25 .data = { 0xf9, 0xad, 0xe9, 0x69, 0x4f, 0x92, 0x5f, 0xab, 0xf6, 0x4a,
26 0x24, 0xd2, 0x01, 0x37, 0x0e, 0xad },
27};
28
29static acpi_status hp_ccsr_locate(acpi_handle obj, u64 *base, u64 *length)
30{
31 acpi_status status;
32 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
33 struct acpi_resource *resource;
34 struct acpi_resource_vendor_typed *vendor;
35
36 status = acpi_get_vendor_resource(obj, METHOD_NAME__CRS, &hp_ccsr_uuid,
37 &buffer);
38
39 resource = buffer.pointer;
40 vendor = &resource->data.vendor_typed;
41
42 if (ACPI_FAILURE(status) || vendor->byte_length < 16) {
43 status = AE_NOT_FOUND;
44 goto exit;
45 }
46
47 memcpy(base, vendor->byte_data, sizeof(*base));
48 memcpy(length, vendor->byte_data + 8, sizeof(*length));
49
50 exit:
51 kfree(buffer.pointer);
52 return status;
53}
54
55struct csr_space {
56 u64 base;
57 u64 length;
58};
59
60static acpi_status find_csr_space(struct acpi_resource *resource, void *data)
61{
62 struct csr_space *space = data;
63 struct acpi_resource_address64 addr;
64 acpi_status status;
65
66 status = acpi_resource_to_address64(resource, &addr);
67 if (ACPI_SUCCESS(status) &&
68 addr.resource_type == ACPI_MEMORY_RANGE &&
69 addr.address.address_length &&
70 addr.producer_consumer == ACPI_CONSUMER) {
71 space->base = addr.address.minimum;
72 space->length = addr.address.address_length;
73 return AE_CTRL_TERMINATE;
74 }
75 return AE_OK; /* keep looking */
76}
77
78static acpi_status hp_crs_locate(acpi_handle obj, u64 *base, u64 *length)
79{
80 struct csr_space space = { 0, 0 };
81
82 acpi_walk_resources(obj, METHOD_NAME__CRS, find_csr_space, &space);
83 if (!space.length)
84 return AE_NOT_FOUND;
85
86 *base = space.base;
87 *length = space.length;
88 return AE_OK;
89}
90
91acpi_status hp_acpi_csr_space(acpi_handle obj, u64 *csr_base, u64 *csr_length)
92{
93 acpi_status status;
94
95 status = hp_ccsr_locate(obj, csr_base, csr_length);
96 if (ACPI_SUCCESS(status))
97 return status;
98
99 return hp_crs_locate(obj, csr_base, csr_length);
100}
101EXPORT_SYMBOL(hp_acpi_csr_space);