[U-Boot] [PATCH 25/40] x86: Support saving MRC data from SPL

[Simon Glass]

When SPL is used to set up the memory controller we want to save the MRC
data in SPL to avoid needing to pass it up to U-Boot proper to save. Add a
function to handle that.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

 arch/x86/include/asm/mrccache.h | 11 ++++++++++
 arch/x86/lib/mrccache.c         | 36 ++++++++++++++++++++++++---------
 2 files changed, 38 insertions(+), 9 deletions(-)

diff --git a/arch/x86/include/asm/mrccache.h b/arch/x86/include/asm/mrccache.h
index 04783cd329..40fda856ff 100644
--- a/arch/x86/include/asm/mrccache.h
+++ b/arch/x86/include/asm/mrccache.h
@@ -103,4 +103,15 @@ int mrccache_get_region(struct udevice **devp, struct mrc_region *entry);
  */
 int mrccache_save(void);
 
+/**
+ * mrccache_spl_save() - Save to the MRC region from SPL
+ *
+ * When SPL is used to set up the memory controller we want to save the MRC
+ * data in SPL to avoid needing to pass it up to U-Boot proper to save. This
+ * function handles that.
+ *
+ * @return 0 if saved to SPI flash successfully, other error if failed
+ */
+int mrccache_spl_save(void);
+
 #endif /* _ASM_MRCCACHE_H */
diff --git a/arch/x86/lib/mrccache.c b/arch/x86/lib/mrccache.c
index 2a8919885b..f37a732a45 100644
--- a/arch/x86/lib/mrccache.c
+++ b/arch/x86/lib/mrccache.c
@@ -159,18 +159,11 @@ int mrccache_update(struct udevice *sf, struct mrc_region *entry,
 	return 0;
 }
 
-int mrccache_reserve(void)
+static void mrccache_setup(void *data)
 {
-	struct mrc_data_container *cache;
+	struct mrc_data_container *cache = data;
 	u16 checksum;
 
-	if (!gd->arch.mrc_output_len)
-		return 0;
-
-	/* adjust stack pointer to store pure cache data plus the header */
-	gd->start_addr_sp -= (gd->arch.mrc_output_len + MRC_DATA_HEADER_SIZE);
-	cache = (struct mrc_data_container *)gd->start_addr_sp;
-
 	cache->signature = MRC_DATA_SIGNATURE;
 	cache->data_size = gd->arch.mrc_output_len;
 	checksum = compute_ip_checksum(gd->arch.mrc_output, cache->data_size);
@@ -182,6 +175,16 @@ int mrccache_reserve(void)
 
 	/* gd->arch.mrc_output now points to the container */
 	gd->arch.mrc_output = (char *)cache;
+}
+
+int mrccache_reserve(void)
+{
+	if (!gd->arch.mrc_output_len)
+		return 0;
+
+	/* adjust stack pointer to store pure cache data plus the header */
+	gd->start_addr_sp -= (gd->arch.mrc_output_len + MRC_DATA_HEADER_SIZE);
+	mrccache_setup((void *)gd->start_addr_sp);
 
 	gd->start_addr_sp &= ~0xf;
 
@@ -256,3 +259,18 @@ err_entry:
 		debug("%s: Failed: %d\n", __func__, ret);
 	return ret;
 }
+
+int mrccache_spl_save(void)
+{
+	void *data;
+	int size;
+
+	size = gd->arch.mrc_output_len + MRC_DATA_HEADER_SIZE;
+	data = malloc(size);
+	if (!data)
+		return log_msg_ret("Allocate MRC cache block", -ENOMEM);
+	mrccache_setup(data);
+	gd->arch.mrc_output = data;
+
+	return mrccache_save();
+}
-- 
2.20.1.495.gaa96b0ce6b-goog