spl: dm: Make it possible for the SPL to pick its own DTB from a FIT

u-boot can be embedded within a FIT image with multiple DTBs. It then
selects at run-time  which one is best suited for the platform.
Use the same principle here for the SPL: put the DTBs in a FIT image,
compress it (LZO, GZIP, or no compression) and append it at the end of the
SPL.

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
[trini: Move default y of SPL_MULTI_DTB_FIT_DYN_ALLOC to it being the
default choice if SYS_MALLOC_F, drop spl.h include from lib/fdtdec.c
it's unused.]
Signed-off-by Tom Rini <trini@konsulko.com>

1 files changed, 78 insertions, 9 deletions

diff --git a/lib/fdtdec.c b/lib/fdtdec.c
index f26d2eb91bb..45f3fe7baf8 100644
--- a/lib/fdtdec.c
+++ b/lib/fdtdec.c
@@ -15,6 +15,7 @@
 #include <serial.h>
 #include <asm/sections.h>
 #include <linux/ctype.h>
+#include <linux/lzo.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -1203,9 +1204,66 @@ int fdtdec_setup_memory_banksize(void)
 }
 #endif
 
+#if CONFIG_IS_ENABLED(MULTI_DTB_FIT)
+# if CONFIG_IS_ENABLED(MULTI_DTB_FIT_GZIP) ||\
+	CONFIG_IS_ENABLED(MULTI_DTB_FIT_LZO)
+static int uncompress_blob(const void *src, ulong sz_src, void **dstp)
+{
+	size_t sz_out = CONFIG_SPL_MULTI_DTB_FIT_UNCOMPRESS_SZ;
+	ulong sz_in = sz_src;
+	void *dst;
+	int rc;
+
+	if (CONFIG_IS_ENABLED(GZIP))
+		if (gzip_parse_header(src, sz_in) < 0)
+			return -1;
+	if (CONFIG_IS_ENABLED(LZO))
+		if (!lzop_is_valid_header(src))
+			return -EBADMSG;
+
+	if (CONFIG_IS_ENABLED(MULTI_DTB_FIT_DYN_ALLOC)) {
+		dst = malloc(sz_out);
+		if (!dst) {
+			puts("uncompress_blob: Unable to allocate memory\n");
+			return -ENOMEM;
+		}
+	} else  {
+#  if CONFIG_IS_ENABLED(MULTI_DTB_FIT_USER_DEFINED_AREA)
+		dst = (void *)CONFIG_VAL(MULTI_DTB_FIT_USER_DEF_ADDR);
+#  else
+		return -ENOTSUPP;
+#  endif
+	}
+
+	if (CONFIG_IS_ENABLED(GZIP))
+		rc = gunzip(dst, sz_out, (u8 *)src, &sz_in);
+	else if (CONFIG_IS_ENABLED(LZO))
+		rc = lzop_decompress(src, sz_in, dst, &sz_out);
+
+	if (rc < 0) {
+		/* not a valid compressed blob */
+		puts("uncompress_blob: Unable to uncompress\n");
+		if (CONFIG_IS_ENABLED(MULTI_DTB_FIT_DYN_ALLOC))
+			free(dst);
+		return -EBADMSG;
+	}
+	*dstp = dst;
+	return 0;
+}
+# else
+static int uncompress_blob(const void *src, ulong sz_src, void **dstp)
+{
+	return -ENOTSUPP;
+}
+# endif
+#endif
+
 int fdtdec_setup(void)
 {
 #if CONFIG_IS_ENABLED(OF_CONTROL)
+# if CONFIG_IS_ENABLED(MULTI_DTB_FIT)
+	void *fdt_blob;
+# endif
 # ifdef CONFIG_OF_EMBED
 	/* Get a pointer to the FDT */
 	gd->fdt_blob = __dtb_dt_begin;
@@ -1216,15 +1274,6 @@ int fdtdec_setup(void)
 		gd->fdt_blob = (ulong *)&_image_binary_end;
 	else
 		gd->fdt_blob = (ulong *)&__bss_end;
-
-#  elif defined CONFIG_MULTI_DTB_FIT
-	gd->fdt_blob = locate_dtb_in_fit(&_end);
-
-	if (gd->fdt_blob == NULL || gd->fdt_blob <= ((void *)&_end)) {
-		puts("Failed to find proper dtb in embedded FIT Image\n");
-		return -1;
-	}
-
 #  else
 	/* FDT is at end of image */
 	gd->fdt_blob = (ulong *)&_end;
@@ -1243,7 +1292,27 @@ int fdtdec_setup(void)
 	gd->fdt_blob = (void *)env_get_ulong("fdtcontroladdr", 16,
 						(uintptr_t)gd->fdt_blob);
 # endif
+
+# if CONFIG_IS_ENABLED(MULTI_DTB_FIT)
+	/*
+	 * Try and uncompress the blob.
+	 * Unfortunately there is no way to know how big the input blob really
+	 * is. So let us set the maximum input size arbitrarily high. 16MB
+	 * ought to be more than enough for packed DTBs.
+	 */
+	if (uncompress_blob(gd->fdt_blob, 0x1000000, &fdt_blob) == 0)
+		gd->fdt_blob = fdt_blob;
+
+	/*
+	 * Check if blob is a FIT images containings DTBs.
+	 * If so, pick the most relevant
+	 */
+	fdt_blob = locate_dtb_in_fit(gd->fdt_blob);
+	if (fdt_blob)
+		gd->fdt_blob = fdt_blob;
+# endif
 #endif
+
 	return fdtdec_prepare_fdt();
 }