ARM: rockchip: Add bootm handler for RKNS images

The rk3568 utilizes boot images starting with the magic 'RKNS'. Add a
bootm handler for these to allow them to be chainloaded.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Link: https://lore.barebox.org/20210615141641.31577-10-s.hauer@pengutronix.de
Link: https://lore.barebox.org/20210621092802.27275-10-s.hauer@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 116 insertions, 0 deletions

diff --git a/arch/arm/mach-rockchip/bootm.c b/arch/arm/mach-rockchip/bootm.c
new file mode 100644
index 0000000000..5d6181ebd7
--- /dev/null
+++ b/arch/arm/mach-rockchip/bootm.c
@@ -0,0 +1,116 @@
+#define pr_fmt(fmt) "rockchip-bootm-barebox: " fmt
+
+#include <bootm.h>
+#include <common.h>
+#include <init.h>
+#include <memory.h>
+
+struct newidb_entry {
+	uint32_t sector;
+	uint32_t unknown_ffffffff;
+	uint32_t unknown1;
+	uint32_t image_number;
+	unsigned char unknown2[8];
+	unsigned char hash[64];
+};
+
+struct newidb {
+	uint32_t magic;
+	unsigned char unknown1[4];
+	uint32_t n_files;
+	uint32_t hashtype;
+	unsigned char unknown2[8];
+	unsigned char unknown3[8];
+	unsigned char unknown4[88];
+	struct newidb_entry entries[4];
+	unsigned char unknown5[40];
+	unsigned char unknown6[512];
+	unsigned char unknown7[16];
+	unsigned char unknown8[32];
+	unsigned char unknown9[464];
+	unsigned char hash[512];
+};
+
+#define SECTOR_SIZE 512
+
+static int do_bootm_rkns_barebox_image(struct image_data *data)
+{
+	void (*barebox)(unsigned long x0, unsigned long x1, unsigned long x2,
+			unsigned long x3);
+	resource_size_t start, end;
+	struct newidb *idb;
+	int ret, i, n_files;
+	void *buf;
+	resource_size_t image_size;
+
+	ret = memory_bank_first_find_space(&start, &end);
+	if (ret)
+		return ret;
+
+	ret = bootm_load_os(data, start);
+	if (ret)
+		return ret;
+
+	idb = (void *)data->os_res->start;
+	buf = (void *)data->os_res->start;
+
+	image_size = resource_size(data->os_res);
+
+	if (image_size < SECTOR_SIZE)
+		return -EINVAL;
+
+	n_files = idb->n_files >> 16;
+	if (n_files > 4)
+		n_files = 4;
+
+	if (data->verbose)
+		printf("RKNS image contains %d binaries:\n", n_files);
+
+	for (i = 0; i < n_files; i++) {
+		struct newidb_entry *entry = &idb->entries[i];
+		unsigned int entry_size = (entry->sector >> 16) * SECTOR_SIZE;
+		unsigned int entry_start = (entry->sector & 0xffff) * SECTOR_SIZE;
+		enum filetype filetype;
+
+		filetype = file_detect_type(buf + entry_start, SECTOR_SIZE);
+
+		if (entry_start + entry_size > image_size) {
+			printf("image %d expands outside the image\n", i);
+			continue;
+		}
+
+		if (data->verbose)
+			printf("image %d: size: %d offset: %d type: %s\n",
+				i, entry_size, entry_start,
+				file_type_to_string(filetype));
+
+		if (filetype == filetype_arm_barebox) {
+			barebox = buf + entry_start;
+			goto found;
+		}
+	}
+
+	return -EIO;
+
+found:
+
+	printf("Starting barebox image at 0x%p\n", barebox);
+
+	shutdown_barebox();
+
+	barebox(0, 0, 0, 0);
+
+	return -EINVAL;
+}
+
+static struct image_handler image_handler_rkns_barebox_image = {
+	.name = "Rockchip RKNS barebox image",
+	.bootm = do_bootm_rkns_barebox_image,
+	.filetype = filetype_rockchip_rkns_image,
+};
+
+static int rockchip_register_barebox_image_handler(void)
+{
+	return register_image_handler(&image_handler_rkns_barebox_image);
+}
+late_initcall(rockchip_register_barebox_image_handler);