tools: zynqimage: Add Xilinx Zynq boot header generation to mkimage

As with other platforms vendors love to create their own boot header
formats. Xilinx is no different and for the Zynq platform/SoC there
exists the "boot.bin" which is read by the platforms bootrom. This
format is described to a useful extent within the Xilinx Zynq TRM.

This implementation adds support for the 'zynqimage' to mkimage. The
implementation only considers the most common boot header which is
un-encrypted and packed directly after the boot header itself (no
XIP, etc.). However this implementation does take into consideration the
other fields of the header for image dumping use cases (vector table and
register initialization).

Signed-off-by: Nathan Rossi <nathan@nathanrossi.com>
Cc: Michal Simek <michal.simek@xilinx.com>
Cc: Tom Rini <trini@konsulko.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>

2 files changed, 258 insertions, 0 deletions

diff --git a/tools/Makefile b/tools/Makefile
index 9082bda..9cfd80b 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -98,6 +98,7 @@ dumpimage-mkimage-objs := aisimage.o \
 			lib/sha256.o \
 			common/hash.o \
 			ublimage.o \
+			zynqimage.o \
 			$(LIBFDT_OBJS) \
 			$(RSA_OBJS-y)
 
diff --git a/tools/zynqimage.c b/tools/zynqimage.c
new file mode 100644
index 0000000..25f558d
--- /dev/null
+++ b/tools/zynqimage.c
@@ -0,0 +1,257 @@
+/*
+ * Copyright (C) 2015 Nathan Rossi <nathan@nathanrossi.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ *
+ * The following Boot Header format/structures and values are defined in the
+ * following documents:
+ *   * Xilinx Zynq-7000 Technical Reference Manual (Section 6.3)
+ *   * Xilinx Zynq-7000 Software Developers Guide (Appendix A.7 and A.8)
+ *
+ * Expected Header Size = 0x8C0
+ * Forced as 'little' endian, 32-bit words
+ *
+ *  0x  0 - Interrupt Table (8 words)
+ *  ...     (Default value = 0xeafffffe)
+ *  0x 1f
+ *  0x 20 - Width Detection
+ *         * DEFAULT_WIDTHDETECTION    0xaa995566
+ *  0x 24 - Image Identifier
+ *         * DEFAULT_IMAGEIDENTIFIER   0x584c4e58
+ *  0x 28 - Encryption
+ *         * 0x00000000 - None
+ *         * 0xa5c3c5a3 - eFuse
+ *         * 0x3a5c3c5a - bbRam
+ *  0x 2C - User Field
+ *  0x 30 - Image Offset
+ *  0x 34 - Image Size
+ *  0x 38 - Reserved (0x00000000) (according to spec)
+ *          * FSBL defines this field for Image Destination Address.
+ *  0x 3C - Image Load
+ *  0x 40 - Image Stored Size
+ *  0x 44 - Reserved (0x00000000) (according to spec)
+ *          * FSBL defines this field for QSPI configuration Data.
+ *  0x 48 - Checksum
+ *  0x 4c - Unused (21 words)
+ *  ...
+ *  0x 9c
+ *  0x a0 - Register Initialization, 256 Address and Data word pairs
+ *         * List is terminated with an address of 0xffffffff or
+ *  ...    * at the max number of entries
+ *  0x89c
+ *  0x8a0 - Unused (8 words)
+ *  ...
+ *  0x8bf
+ *  0x8c0 - Data/Image starts here or above
+ */
+
+#include "imagetool.h"
+#include "mkimage.h"
+#include <image.h>
+
+#define HEADER_INTERRUPT_DEFAULT (cpu_to_le32(0xeafffffe))
+#define HEADER_REGINIT_NULL (cpu_to_le32(0xffffffff))
+#define HEADER_WIDTHDETECTION (cpu_to_le32(0xaa995566))
+#define HEADER_IMAGEIDENTIFIER (cpu_to_le32(0x584c4e58))
+
+enum {
+	ENCRYPTION_EFUSE = 0xa5c3c5a3,
+	ENCRYPTION_BBRAM = 0x3a5c3c5a,
+	ENCRYPTION_NONE = 0x0,
+};
+
+struct zynq_reginit {
+	uint32_t address;
+	uint32_t data;
+};
+
+#define HEADER_INTERRUPT_VECTORS 8
+#define HEADER_REGINITS 256
+
+struct zynq_header {
+	uint32_t interrupt_vectors[HEADER_INTERRUPT_VECTORS]; /* 0x0 */
+	uint32_t width_detection; /* 0x20 */
+	uint32_t image_identifier; /* 0x24 */
+	uint32_t encryption; /* 0x28 */
+	uint32_t user_field; /* 0x2c */
+	uint32_t image_offset; /* 0x30 */
+	uint32_t image_size; /* 0x34 */
+	uint32_t __reserved1; /* 0x38 */
+	uint32_t image_load; /* 0x3c */
+	uint32_t image_stored_size; /* 0x40 */
+	uint32_t __reserved2; /* 0x44 */
+	uint32_t checksum; /* 0x48 */
+	uint32_t __reserved3[21]; /* 0x4c */
+	struct zynq_reginit register_init[HEADER_REGINITS]; /* 0xa0 */
+	uint32_t __reserved4[8]; /* 0x8a0 */
+};
+
+static struct zynq_header zynqimage_header;
+
+static uint32_t zynqimage_checksum(struct zynq_header *ptr)
+{
+	uint32_t checksum = 0;
+
+	if (ptr == NULL)
+		return 0;
+
+	checksum += le32_to_cpu(ptr->width_detection);
+	checksum += le32_to_cpu(ptr->image_identifier);
+	checksum += le32_to_cpu(ptr->encryption);
+	checksum += le32_to_cpu(ptr->user_field);
+	checksum += le32_to_cpu(ptr->image_offset);
+	checksum += le32_to_cpu(ptr->image_size);
+	checksum += le32_to_cpu(ptr->__reserved1);
+	checksum += le32_to_cpu(ptr->image_load);
+	checksum += le32_to_cpu(ptr->image_stored_size);
+	checksum += le32_to_cpu(ptr->__reserved2);
+	checksum = ~checksum;
+
+	return cpu_to_le32(checksum);
+}
+
+static void zynqimage_default_header(struct zynq_header *ptr)
+{
+	int i;
+
+	if (ptr == NULL)
+		return;
+
+	ptr->width_detection = HEADER_WIDTHDETECTION;
+	ptr->image_identifier = HEADER_IMAGEIDENTIFIER;
+	ptr->encryption = cpu_to_le32(ENCRYPTION_NONE);
+
+	/* Setup not-supported/constant/reserved fields */
+	for (i = 0; i < HEADER_INTERRUPT_VECTORS; i++)
+		ptr->interrupt_vectors[i] = HEADER_INTERRUPT_DEFAULT;
+
+	for (i = 0; i < HEADER_REGINITS; i++) {
+		ptr->register_init[i].address = HEADER_REGINIT_NULL;
+		ptr->register_init[i].data = HEADER_REGINIT_NULL;
+	}
+
+	/*
+	 * Certain reserved fields are required to be set to 0, ensure they are
+	 * set as such.
+	 */
+	ptr->__reserved1 = 0x0;
+	ptr->__reserved2 = 0x0;
+}
+
+/* mkimage glue functions */
+static int zynqimage_verify_header(unsigned char *ptr, int image_size,
+		struct image_tool_params *params)
+{
+	struct zynq_header *zynqhdr = (struct zynq_header *)ptr;
+
+	if (image_size < sizeof(struct zynq_header))
+		return -1;
+
+	if (zynqhdr->width_detection != HEADER_WIDTHDETECTION)
+		return -1;
+	if (zynqhdr->image_identifier != HEADER_IMAGEIDENTIFIER)
+		return -1;
+
+	if (zynqimage_checksum(zynqhdr) != zynqhdr->checksum)
+		return -1;
+
+	return 0;
+}
+
+static void zynqimage_print_header(const void *ptr)
+{
+	struct zynq_header *zynqhdr = (struct zynq_header *)ptr;
+	int i;
+
+	printf("Image Type   : Xilinx Zynq Boot Image support\n");
+	printf("Image Offset : 0x%08x\n", le32_to_cpu(zynqhdr->image_offset));
+	printf("Image Size   : %lu bytes (%lu bytes packed)\n",
+	       (unsigned long)le32_to_cpu(zynqhdr->image_size),
+	       (unsigned long)le32_to_cpu(zynqhdr->image_stored_size));
+	printf("Image Load   : 0x%08x\n", le32_to_cpu(zynqhdr->image_load));
+	printf("User Field   : 0x%08x\n", le32_to_cpu(zynqhdr->user_field));
+	printf("Checksum     : 0x%08x\n", le32_to_cpu(zynqhdr->checksum));
+
+	for (i = 0; i < HEADER_INTERRUPT_VECTORS; i++) {
+		if (zynqhdr->interrupt_vectors[i] == HEADER_INTERRUPT_DEFAULT)
+			continue;
+
+		printf("Modified Interrupt Vector Address [%d]: 0x%08x\n", i,
+		       le32_to_cpu(zynqhdr->interrupt_vectors[i]));
+	}
+
+	for (i = 0; i < HEADER_REGINITS; i++) {
+		if (zynqhdr->register_init[i].address == HEADER_REGINIT_NULL)
+			break;
+
+		if (i == 0)
+			printf("Custom Register Initialization:\n");
+
+		printf("    @ 0x%08x -> 0x%08x\n",
+		       le32_to_cpu(zynqhdr->register_init[i].address),
+		       le32_to_cpu(zynqhdr->register_init[i].data));
+	}
+}
+
+static int zynqimage_check_params(struct image_tool_params *params)
+{
+	if (!params)
+		return 0;
+
+	if (params->addr != 0x0) {
+		fprintf(stderr, "Error: Load Address cannot be specified.\n");
+		return -1;
+	}
+
+	/*
+	 * If the entry point is specified ensure it is 64 byte aligned.
+	 */
+	if (params->eflag && (params->ep % 64 != 0)) {
+		fprintf(stderr,
+			"Error: Entry Point must be aligned to a 64-byte boundary.\n");
+		return -1;
+	}
+
+	return !((params->lflag || params->dflag) ||
+			(params->dflag && params->eflag));
+}
+
+static int zynqimage_check_image_types(uint8_t type)
+{
+	if (type == IH_TYPE_ZYNQIMAGE)
+		return EXIT_SUCCESS;
+	return EXIT_FAILURE;
+}
+
+static void zynqimage_set_header(void *ptr, struct stat *sbuf, int ifd,
+		struct image_tool_params *params)
+{
+	struct zynq_header *zynqhdr = (struct zynq_header *)ptr;
+	zynqimage_default_header(zynqhdr);
+
+	/* place image directly after header */
+	zynqhdr->image_offset =
+		cpu_to_le32((uint32_t)sizeof(struct zynq_header));
+	zynqhdr->image_size = cpu_to_le32((uint32_t)sbuf->st_size);
+	zynqhdr->image_stored_size = zynqhdr->image_size;
+	zynqhdr->image_load = 0x0;
+	if (params->eflag)
+		zynqhdr->image_load = cpu_to_le32((uint32_t)params->ep);
+
+	zynqhdr->checksum = zynqimage_checksum(zynqhdr);
+}
+
+U_BOOT_IMAGE_TYPE(
+	zynqimage,
+	"Xilinx Zynq Boot Image support",
+	sizeof(struct zynq_header),
+	(void *)&zynqimage_header,
+	zynqimage_check_params,
+	zynqimage_verify_header,
+	zynqimage_print_header,
+	zynqimage_set_header,
+	NULL,
+	zynqimage_check_image_types,
+	NULL,
+	NULL
+);