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106 lines
2.4 KiB
C
106 lines
2.4 KiB
C
/*
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* arch/ia64/kernel/acpi-ext.c
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*
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* Copyright (C) 2003 Hewlett-Packard
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* Copyright (C) Alex Williamson
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* Copyright (C) Bjorn Helgaas
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*
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* Vendor specific extensions to ACPI.
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/acpi.h>
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#include <linux/efi.h>
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#include <asm/acpi-ext.h>
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struct acpi_vendor_descriptor {
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u8 guid_id;
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efi_guid_t guid;
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};
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struct acpi_vendor_info {
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struct acpi_vendor_descriptor *descriptor;
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u8 *data;
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u32 length;
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};
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acpi_status
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acpi_vendor_resource_match(struct acpi_resource *resource, void *context)
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{
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struct acpi_vendor_info *info = (struct acpi_vendor_info *)context;
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struct acpi_resource_vendor *vendor;
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struct acpi_vendor_descriptor *descriptor;
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u32 length;
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if (resource->id != ACPI_RSTYPE_VENDOR)
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return AE_OK;
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vendor = (struct acpi_resource_vendor *)&resource->data;
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descriptor = (struct acpi_vendor_descriptor *)vendor->reserved;
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if (vendor->length <= sizeof(*info->descriptor) ||
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descriptor->guid_id != info->descriptor->guid_id ||
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efi_guidcmp(descriptor->guid, info->descriptor->guid))
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return AE_OK;
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length = vendor->length - sizeof(struct acpi_vendor_descriptor);
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info->data = acpi_os_allocate(length);
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if (!info->data)
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return AE_NO_MEMORY;
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memcpy(info->data,
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vendor->reserved + sizeof(struct acpi_vendor_descriptor),
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length);
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info->length = length;
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return AE_CTRL_TERMINATE;
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}
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acpi_status
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acpi_find_vendor_resource(acpi_handle obj, struct acpi_vendor_descriptor * id,
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u8 ** data, u32 * length)
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{
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struct acpi_vendor_info info;
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info.descriptor = id;
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info.data = NULL;
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acpi_walk_resources(obj, METHOD_NAME__CRS, acpi_vendor_resource_match,
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&info);
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if (!info.data)
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return AE_NOT_FOUND;
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*data = info.data;
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*length = info.length;
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return AE_OK;
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}
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struct acpi_vendor_descriptor hp_ccsr_descriptor = {
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.guid_id = 2,
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.guid =
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EFI_GUID(0x69e9adf9, 0x924f, 0xab5f, 0xf6, 0x4a, 0x24, 0xd2, 0x01,
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0x37, 0x0e, 0xad)
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};
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acpi_status hp_acpi_csr_space(acpi_handle obj, u64 * csr_base, u64 * csr_length)
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{
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acpi_status status;
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u8 *data;
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u32 length;
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status =
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acpi_find_vendor_resource(obj, &hp_ccsr_descriptor, &data, &length);
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if (ACPI_FAILURE(status) || length != 16)
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return AE_NOT_FOUND;
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memcpy(csr_base, data, sizeof(*csr_base));
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memcpy(csr_length, data + 8, sizeof(*csr_length));
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acpi_os_free(data);
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return AE_OK;
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}
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EXPORT_SYMBOL(hp_acpi_csr_space);
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