ACPI 5.0: Implement Connection() and AccessAs() changes

Support within the interpreter and operation region dispatch.

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 66 insertions, 15 deletions

diff --git a/drivers/acpi/acpica/dsfield.c b/drivers/acpi/acpica/dsfield.c
index 34be60c0e448..aa880d992984 100644
--- a/drivers/acpi/acpica/dsfield.c
+++ b/drivers/acpi/acpica/dsfield.c
@@ -221,6 +221,7 @@ acpi_ds_get_field_names(struct acpi_create_field_info *info,
 {
         acpi_status status;
         u64 position;
+        union acpi_parse_object *child;
 
         ACPI_FUNCTION_TRACE_PTR(ds_get_field_names, info);
 
@@ -232,10 +233,11 @@ acpi_ds_get_field_names(struct acpi_create_field_info *info,
 
         while (arg) {
                 /*
-                 * Three types of field elements are handled:
-                 * 1) Offset - specifies a bit offset
-                 * 2) access_as - changes the access mode
-                 * 3) Name - Enters a new named field into the namespace
+                 * Four types of field elements are handled:
+                 * 1) Name - Enters a new named field into the namespace
+                 * 2) Offset - specifies a bit offset
+                 * 3) access_as - changes the access mode/attributes
+                 * 4) Connection - Associate a resource template with the field
                  */
                 switch (arg->common.aml_opcode) {
                 case AML_INT_RESERVEDFIELD_OP:
@@ -253,21 +255,70 @@ acpi_ds_get_field_names(struct acpi_create_field_info *info,
                         break;
 
                 case AML_INT_ACCESSFIELD_OP:
-
+                case AML_INT_EXTACCESSFIELD_OP:
                         /*
-                         * Get a new access_type and access_attribute -- to be used for all
-                         * field units that follow, until field end or another access_as
-                         * keyword.
+                         * Get new access_type, access_attribute, and access_length fields
+                         * -- to be used for all field units that follow, until the
+                         * end-of-field or another access_as keyword is encountered.
+                         * NOTE. These three bytes are encoded in the integer value
+                         * of the parseop for convenience.
                          *
                          * In field_flags, preserve the flag bits other than the
-                         * ACCESS_TYPE bits
+                         * ACCESS_TYPE bits.
                          */
+
+                        /* access_type (byte_acc, word_acc, etc.) */
+
                         info->field_flags = (u8)
                             ((info->
                               field_flags & ~(AML_FIELD_ACCESS_TYPE_MASK)) |
-                             ((u8) ((u32) arg->common.value.integer >> 8)));
+                             ((u8)((u32)(arg->common.value.integer & 0x07))));
+
+                        /* access_attribute (attrib_quick, attrib_byte, etc.) */
+
+                        info->attribute =
+                            (u8)((arg->common.value.integer >> 8) & 0xFF);
+
+                        /* access_length (for serial/buffer protocols) */
+
+                        info->access_length =
+                            (u8)((arg->common.value.integer >> 16) & 0xFF);
+                        break;
+
+                case AML_INT_CONNECTION_OP:
+                        /*
+                         * Clear any previous connection. New connection is used for all
+                         * fields that follow, similar to access_as
+                         */
+                        info->resource_buffer = NULL;
+                        info->connection_node = NULL;
 
-                        info->attribute = (u8) (arg->common.value.integer);
+                        /*
+                         * A Connection() is either an actual resource descriptor (buffer)
+                         * or a named reference to a resource template
+                         */
+                        child = arg->common.value.arg;
+                        if (child->common.aml_opcode == AML_INT_BYTELIST_OP) {
+                                info->resource_buffer = child->named.data;
+                                info->resource_length =
+                                    (u16)child->named.value.integer;
+                        } else {
+                                /* Lookup the Connection() namepath, it should already exist */
+
+                                status = acpi_ns_lookup(walk_state->scope_info,
+                                                        child->common.value.
+                                                        name, ACPI_TYPE_ANY,
+                                                        ACPI_IMODE_EXECUTE,
+                                                        ACPI_NS_DONT_OPEN_SCOPE,
+                                                        walk_state,
+                                                        &info->connection_node);
+                                if (ACPI_FAILURE(status)) {
+                                        ACPI_ERROR_NAMESPACE(child->common.
+                                                             value.name,
+                                                             status);
+                                        return_ACPI_STATUS(status);
+                                }
+                        }
                         break;
 
                 case AML_INT_NAMEDFIELD_OP:
@@ -374,6 +425,8 @@ acpi_ds_create_field(union acpi_parse_object *op,
                 }
         }
 
+        ACPI_MEMSET(&info, 0, sizeof(struct acpi_create_field_info));
+
         /* Second arg is the field flags */
 
         arg = arg->common.next;
@@ -386,7 +439,6 @@ acpi_ds_create_field(union acpi_parse_object *op,
         info.region_node = region_node;
 
         status = acpi_ds_get_field_names(&info, walk_state, arg->common.next);
-
         return_ACPI_STATUS(status);
 }
 
@@ -474,8 +526,8 @@ acpi_ds_init_field_objects(union acpi_parse_object *op,
          */
         while (arg) {
                 /*
-                 * Ignore OFFSET and ACCESSAS terms here; we are only interested in the
-                 * field names in order to enter them into the namespace.
+                 * Ignore OFFSET/ACCESSAS/CONNECTION terms here; we are only interested
+                 * in the field names in order to enter them into the namespace.
                  */
                 if (arg->common.aml_opcode == AML_INT_NAMEDFIELD_OP) {
                         status = acpi_ns_lookup(walk_state->scope_info,
@@ -651,6 +703,5 @@ acpi_ds_create_index_field(union acpi_parse_object *op,
         info.region_node = region_node;
 
         status = acpi_ds_get_field_names(&info, walk_state, arg->common.next);
-
         return_ACPI_STATUS(status);
 }