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   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);