Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * arch/ia64/kernel/acpi-ext.c |
| 3 | * |
| 4 | * Copyright (C) 2003 Hewlett-Packard |
| 5 | * Copyright (C) Alex Williamson |
| 6 | * Copyright (C) Bjorn Helgaas |
| 7 | * |
| 8 | * Vendor specific extensions to ACPI. |
| 9 | */ |
| 10 | |
| 11 | #include <linux/config.h> |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/types.h> |
| 14 | #include <linux/acpi.h> |
| 15 | #include <linux/efi.h> |
| 16 | |
| 17 | #include <asm/acpi-ext.h> |
| 18 | |
| 19 | struct acpi_vendor_descriptor { |
| 20 | u8 guid_id; |
| 21 | efi_guid_t guid; |
| 22 | }; |
| 23 | |
| 24 | struct acpi_vendor_info { |
| 25 | struct acpi_vendor_descriptor *descriptor; |
| 26 | u8 *data; |
| 27 | u32 length; |
| 28 | }; |
| 29 | |
| 30 | acpi_status |
| 31 | acpi_vendor_resource_match(struct acpi_resource *resource, void *context) |
| 32 | { |
| 33 | struct acpi_vendor_info *info = (struct acpi_vendor_info *) context; |
| 34 | struct acpi_resource_vendor *vendor; |
| 35 | struct acpi_vendor_descriptor *descriptor; |
| 36 | u32 length; |
| 37 | |
| 38 | if (resource->id != ACPI_RSTYPE_VENDOR) |
| 39 | return AE_OK; |
| 40 | |
| 41 | vendor = (struct acpi_resource_vendor *) &resource->data; |
| 42 | descriptor = (struct acpi_vendor_descriptor *) vendor->reserved; |
| 43 | if (vendor->length <= sizeof(*info->descriptor) || |
| 44 | descriptor->guid_id != info->descriptor->guid_id || |
| 45 | efi_guidcmp(descriptor->guid, info->descriptor->guid)) |
| 46 | return AE_OK; |
| 47 | |
| 48 | length = vendor->length - sizeof(struct acpi_vendor_descriptor); |
| 49 | info->data = acpi_os_allocate(length); |
| 50 | if (!info->data) |
| 51 | return AE_NO_MEMORY; |
| 52 | |
| 53 | memcpy(info->data, vendor->reserved + sizeof(struct acpi_vendor_descriptor), length); |
| 54 | info->length = length; |
| 55 | return AE_CTRL_TERMINATE; |
| 56 | } |
| 57 | |
| 58 | acpi_status |
| 59 | acpi_find_vendor_resource(acpi_handle obj, struct acpi_vendor_descriptor *id, |
| 60 | u8 **data, u32 *length) |
| 61 | { |
| 62 | struct acpi_vendor_info info; |
| 63 | |
| 64 | info.descriptor = id; |
| 65 | info.data = NULL; |
| 66 | |
| 67 | acpi_walk_resources(obj, METHOD_NAME__CRS, acpi_vendor_resource_match, &info); |
| 68 | if (!info.data) |
| 69 | return AE_NOT_FOUND; |
| 70 | |
| 71 | *data = info.data; |
| 72 | *length = info.length; |
| 73 | return AE_OK; |
| 74 | } |
| 75 | |
| 76 | struct acpi_vendor_descriptor hp_ccsr_descriptor = { |
| 77 | .guid_id = 2, |
| 78 | .guid = EFI_GUID(0x69e9adf9, 0x924f, 0xab5f, 0xf6, 0x4a, 0x24, 0xd2, 0x01, 0x37, 0x0e, 0xad) |
| 79 | }; |
| 80 | |
| 81 | acpi_status |
| 82 | hp_acpi_csr_space(acpi_handle obj, u64 *csr_base, u64 *csr_length) |
| 83 | { |
| 84 | acpi_status status; |
| 85 | u8 *data; |
| 86 | u32 length; |
| 87 | |
| 88 | status = acpi_find_vendor_resource(obj, &hp_ccsr_descriptor, &data, &length); |
| 89 | |
| 90 | if (ACPI_FAILURE(status) || length != 16) |
| 91 | return AE_NOT_FOUND; |
| 92 | |
| 93 | memcpy(csr_base, data, sizeof(*csr_base)); |
| 94 | memcpy(csr_length, data + 8, sizeof(*csr_length)); |
| 95 | acpi_os_free(data); |
| 96 | |
| 97 | return AE_OK; |
| 98 | } |
| 99 | |
| 100 | EXPORT_SYMBOL(hp_acpi_csr_space); |