x86: Allow devices to write an SSDT

Call the new core function to write the SSDT. This is made up of fragments
generated by devices that have the fill_ssdt() method.

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>

diff --git a/arch/x86/lib/acpi_table.c b/arch/x86/lib/acpi_table.c
index e96acf0..4658d88 100644 (file)
--- a/arch/x86/lib/acpi_table.c
+++ b/arch/x86/lib/acpi_table.c
@@ -14,6 +14,7 @@
 #include <mapmem.h>
 #include <serial.h>
 #include <version.h>
+#include <acpi/acpigen.h>
 #include <acpi/acpi_table.h>
 #include <asm/acpi/global_nvs.h>
 #include <asm/ioapic.h>
@@ -354,6 +355,25 @@ static void acpi_create_spcr(struct acpi_spcr *spcr)
        header->checksum = table_compute_checksum((void *)spcr, header->length);
 }
 
+void acpi_create_ssdt(struct acpi_ctx *ctx, struct acpi_table_header *ssdt,
+                     const char *oem_table_id)
+{
+       memset((void *)ssdt, '\0', sizeof(struct acpi_table_header));
+
+       acpi_fill_header(ssdt, "SSDT");
+       ssdt->revision = acpi_get_table_revision(ACPITAB_SSDT);
+       ssdt->aslc_revision = 1;
+       ssdt->length = sizeof(struct acpi_table_header);
+
+       acpi_inc(ctx, sizeof(struct acpi_table_header));
+
+       acpi_fill_ssdt(ctx);
+
+       /* (Re)calculate length and checksum. */
+       ssdt->length = ctx->current - (void *)ssdt;
+       ssdt->checksum = table_compute_checksum((void *)ssdt, ssdt->length);
+}
+
 /*
  * QEMU's version of write_acpi_tables is defined in drivers/misc/qfw.c
  */
@@ -363,6 +383,7 @@ ulong write_acpi_tables(ulong start_addr)
        struct acpi_facs *facs;
        struct acpi_table_header *dsdt;
        struct acpi_fadt *fadt;
+       struct acpi_table_header *ssdt;
        struct acpi_mcfg *mcfg;
        struct acpi_madt *madt;
        struct acpi_csrt *csrt;
@@ -418,6 +439,14 @@ ulong write_acpi_tables(ulong start_addr)
        acpi_create_fadt(fadt, facs, dsdt);
        acpi_add_table(ctx, fadt);
 
+       debug("ACPI:     * SSDT\n");
+       ssdt = (struct acpi_table_header *)ctx->current;
+       acpi_create_ssdt(ctx, ssdt, OEM_TABLE_ID);
+       if (ssdt->length > sizeof(struct acpi_table_header)) {
+               acpi_inc_align(ctx, ssdt->length);
+               acpi_add_table(ctx, ssdt);
+       }
+
        debug("ACPI:    * MCFG\n");
        mcfg = ctx->current;
        acpi_create_mcfg(mcfg);