gma pcode: Add Mailbox_Read procedure
Some chipsets may have data that they need to read from the PCode,
with no data in particular necessary, therefore add a `Mailbox_Read`
procedure to do this.
Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Change-Id: Ic8505ef46661c291e6f0787279b32430669f7d14
Reviewed-on: https://review.coreboot.org/c/libgfxinit/+/65140
Tested-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Nico Huber <nico.h@gmx.de>
diff --git a/common/hw-gfx-gma-pcode.adb b/common/hw-gfx-gma-pcode.adb
index dd0fc6e..bc1dfef 100644
--- a/common/hw-gfx-gma-pcode.adb
+++ b/common/hw-gfx-gma-pcode.adb
@@ -84,6 +84,17 @@
(MBox, Command, Ignored_R, Wait_Ready, Wait_Ack, Success);
end Mailbox_Write;
+ procedure Mailbox_Read
+ (MBox : in Word32;
+ Command : in Word64 := 0;
+ Wait_Ready : in Boolean := False;
+ Reply : out Word64;
+ Success : out Boolean)
+ is
+ begin
+ Mailbox_Write_Read (MBox, Command, Reply, Wait_Ready, True, Success);
+ end Mailbox_Read;
+
procedure Mailbox_Request
(MBox : in Word32;
Command : in Word64;