summaryrefslogtreecommitdiff
path: root/arch/ia64/kernel/acpi-ext.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/ia64/kernel/acpi-ext.c')
-rw-r--r--arch/ia64/kernel/acpi-ext.c100
1 files changed, 100 insertions, 0 deletions
diff --git a/arch/ia64/kernel/acpi-ext.c b/arch/ia64/kernel/acpi-ext.c
new file mode 100644
index 00000000000..2623df5e263
--- /dev/null
+++ b/arch/ia64/kernel/acpi-ext.c
@@ -0,0 +1,100 @@
+/*
+ * arch/ia64/kernel/acpi-ext.c
+ *
+ * Copyright (C) 2003 Hewlett-Packard
+ * Copyright (C) Alex Williamson
+ * Copyright (C) Bjorn Helgaas
+ *
+ * Vendor specific extensions to ACPI.
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/acpi.h>
+#include <linux/efi.h>
+
+#include <asm/acpi-ext.h>
+
+struct acpi_vendor_descriptor {
+ u8 guid_id;
+ efi_guid_t guid;
+};
+
+struct acpi_vendor_info {
+ struct acpi_vendor_descriptor *descriptor;
+ u8 *data;
+ u32 length;
+};
+
+acpi_status
+acpi_vendor_resource_match(struct acpi_resource *resource, void *context)
+{
+ struct acpi_vendor_info *info = (struct acpi_vendor_info *) context;
+ struct acpi_resource_vendor *vendor;
+ struct acpi_vendor_descriptor *descriptor;
+ u32 length;
+
+ if (resource->id != ACPI_RSTYPE_VENDOR)
+ return AE_OK;
+
+ vendor = (struct acpi_resource_vendor *) &resource->data;
+ descriptor = (struct acpi_vendor_descriptor *) vendor->reserved;
+ if (vendor->length <= sizeof(*info->descriptor) ||
+ descriptor->guid_id != info->descriptor->guid_id ||
+ efi_guidcmp(descriptor->guid, info->descriptor->guid))
+ return AE_OK;
+
+ length = vendor->length - sizeof(struct acpi_vendor_descriptor);
+ info->data = acpi_os_allocate(length);
+ if (!info->data)
+ return AE_NO_MEMORY;
+
+ memcpy(info->data, vendor->reserved + sizeof(struct acpi_vendor_descriptor), length);
+ info->length = length;
+ return AE_CTRL_TERMINATE;
+}
+
+acpi_status
+acpi_find_vendor_resource(acpi_handle obj, struct acpi_vendor_descriptor *id,
+ u8 **data, u32 *length)
+{
+ struct acpi_vendor_info info;
+
+ info.descriptor = id;
+ info.data = NULL;
+
+ acpi_walk_resources(obj, METHOD_NAME__CRS, acpi_vendor_resource_match, &info);
+ if (!info.data)
+ return AE_NOT_FOUND;
+
+ *data = info.data;
+ *length = info.length;
+ return AE_OK;
+}
+
+struct acpi_vendor_descriptor hp_ccsr_descriptor = {
+ .guid_id = 2,
+ .guid = EFI_GUID(0x69e9adf9, 0x924f, 0xab5f, 0xf6, 0x4a, 0x24, 0xd2, 0x01, 0x37, 0x0e, 0xad)
+};
+
+acpi_status
+hp_acpi_csr_space(acpi_handle obj, u64 *csr_base, u64 *csr_length)
+{
+ acpi_status status;
+ u8 *data;
+ u32 length;
+
+ status = acpi_find_vendor_resource(obj, &hp_ccsr_descriptor, &data, &length);
+
+ if (ACPI_FAILURE(status) || length != 16)
+ return AE_NOT_FOUND;
+
+ memcpy(csr_base, data, sizeof(*csr_base));
+ memcpy(csr_length, data + 8, sizeof(*csr_length));
+ acpi_os_free(data);
+
+ return AE_OK;
+}
+
+EXPORT_SYMBOL(hp_acpi_csr_space);