From b0edea3c27af3bf7b959fa190a7fe9d7881153c5 Mon Sep 17 00:00:00 2001
From: Simon Glass <sjg@chromium.org>
Date: Thu, 15 Nov 2018 18:44:09 -0700
Subject: spl: Add support for passing handoff info to U-Boot proper

There is some basic informaton that SPL normally wants to pass through to
U-Boot, such as the SDRAM size and bank information.

Mkae use of the new bloblist structure for this. Add a new 'handoff' blob
which is set up in SPL and passed to U-Boot proper. Also adda  test for
sandbox_spl that checks that this works correctly and a new 'sb' command
to show the information passed from SPL.

Reviewed-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
---
 include/asm-generic/global_data.h |  3 +++
 include/handoff.h                 | 36 ++++++++++++++++++++++++++++++++++++
 include/spl.h                     |  1 +
 3 files changed, 40 insertions(+)
 create mode 100644 include/handoff.h

(limited to 'include')

diff --git a/include/asm-generic/global_data.h b/include/asm-generic/global_data.h
index ccf361ed88a..dffd6b26026 100644
--- a/include/asm-generic/global_data.h
+++ b/include/asm-generic/global_data.h
@@ -125,6 +125,9 @@ typedef struct global_data {
 #if CONFIG_IS_ENABLED(BLOBLIST)
 	struct bloblist_hdr *bloblist;	/* Bloblist information */
 	struct bloblist_hdr *new_bloblist;	/* Relocated blolist info */
+# ifdef CONFIG_SPL
+	struct spl_handoff *spl_handoff;
+# endif
 #endif
 } gd_t;
 #endif
diff --git a/include/handoff.h b/include/handoff.h
new file mode 100644
index 00000000000..aacb0f5ebf2
--- /dev/null
+++ b/include/handoff.h
@@ -0,0 +1,36 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Passing basic information from SPL to U-Boot proper
+ *
+ * Copyright 2018 Google, Inc
+ */
+
+#ifndef __HANDOFF_H
+#define __HANDOFF_H
+
+#if CONFIG_IS_ENABLED(HANDOFF)
+
+#include <asm/handoff.h>
+
+/**
+ * struct spl_handoff - information passed from SPL to U-Boot proper
+ *
+ * @ram_size: Value to use for gd->ram_size
+ */
+struct spl_handoff {
+	struct arch_spl_handoff arch;
+	u64 ram_size;
+#ifdef CONFIG_NR_DRAM_BANKS
+	struct {
+		u64 start;
+		u64 size;
+	} ram_bank[CONFIG_NR_DRAM_BANKS];
+#endif
+};
+
+void handoff_save_dram(struct spl_handoff *ho);
+void handoff_load_dram_size(struct spl_handoff *ho);
+void handoff_load_dram_banks(struct spl_handoff *ho);
+#endif
+
+#endif
diff --git a/include/spl.h b/include/spl.h
index 205aaff4b9d..ee92832f0ae 100644
--- a/include/spl.h
+++ b/include/spl.h
@@ -11,6 +11,7 @@
 /* Platform-specific defines */
 #include <linux/compiler.h>
 #include <asm/spl.h>
+#include <handoff.h>
 
 /* Value in r0 indicates we booted from U-Boot */
 #define UBOOT_NOT_LOADED_FROM_SPL	0x13578642
-- 
cgit v1.3.1