acpi: Add support for DSDT generation
Some devices need to inject extra code into the Differentiated System
Descriptor Table (DSDT). Add a method to handle this.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
[bmeng: correct one typo in inject_dsdt() comments]
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/drivers/core/acpi.c b/drivers/core/acpi.c
index a9b7fc1..7b32694 100644
--- a/drivers/core/acpi.c
+++ b/drivers/core/acpi.c
@@ -22,12 +22,14 @@
enum gen_type_t {
TYPE_NONE,
TYPE_SSDT,
+ TYPE_DSDT,
};
/* Type of method to call */
enum method_t {
METHOD_WRITE_TABLES,
METHOD_FILL_SSDT,
+ METHOD_INJECT_DSDT,
};
/* Prototype for all methods */
@@ -144,7 +146,9 @@
void *end = ctx->current;
ptr = start;
- order = ofnode_read_chosen_prop("u-boot,acpi-ssdt-order", &size);
+ order = ofnode_read_chosen_prop(type == TYPE_DSDT ?
+ "u-boot,acpi-dsdt-order" :
+ "u-boot,acpi-ssdt-order", &size);
if (!order) {
log_warning("Failed to find ordering, leaving as is\n");
return 0;
@@ -198,6 +202,8 @@
return aops->write_tables;
case METHOD_FILL_SSDT:
return aops->fill_ssdt;
+ case METHOD_INJECT_DSDT:
+ return aops->inject_dsdt;
}
}
@@ -256,6 +262,23 @@
return ret;
}
+int acpi_inject_dsdt(struct acpi_ctx *ctx)
+{
+ void *start = ctx->current;
+ int ret;
+
+ log_debug("Writing DSDT tables\n");
+ item_count = 0;
+ ret = acpi_recurse_method(ctx, dm_root(), METHOD_INJECT_DSDT,
+ TYPE_DSDT);
+ log_debug("Writing DSDT finished, err=%d\n", ret);
+ ret = sort_acpi_item_type(ctx, start, TYPE_DSDT);
+ if (ret)
+ return log_msg_ret("build", ret);
+
+ return ret;
+}
+
int acpi_write_dev_tables(struct acpi_ctx *ctx)
{
int ret;