fastboot: Move fastboot to drivers/fastboot

Separate CMD_FASTBOOT from FASTBOOT and move code and configuration to
drivers/fastboot.

Switch dependencies on FASTBOOT to USB_FUNCTION_FASTBOOT as anyone who wants
FASTBOOT before this series wants USB_FUNCTION_FASTBOOT. Split
USB_FUNCTION_FASTBOOT from FASTBOOT so they retain their existing
behaviour.

Signed-off-by: Alex Kiernan <alex.kiernan@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>

1 files changed, 230 insertions, 0 deletions

diff --git a/drivers/fastboot/fb_nand.c b/drivers/fastboot/fb_nand.c
new file mode 100644
index 0000000000..c07655e49e
--- /dev/null
+++ b/drivers/fastboot/fb_nand.c
@@ -0,0 +1,230 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2014 Broadcom Corporation.
+ * Copyright 2015 Free Electrons.
+ */
+
+#include <config.h>
+#include <common.h>
+
+#include <fastboot.h>
+#include <image-sparse.h>
+
+#include <linux/mtd/mtd.h>
+#include <jffs2/jffs2.h>
+#include <nand.h>
+
+struct fb_nand_sparse {
+	struct mtd_info		*mtd;
+	struct part_info	*part;
+};
+
+__weak int board_fastboot_erase_partition_setup(char *name)
+{
+	return 0;
+}
+
+__weak int board_fastboot_write_partition_setup(char *name)
+{
+	return 0;
+}
+
+static int fb_nand_lookup(const char *partname,
+			  struct mtd_info **mtd,
+			  struct part_info **part)
+{
+	struct mtd_device *dev;
+	int ret;
+	u8 pnum;
+
+	ret = mtdparts_init();
+	if (ret) {
+		pr_err("Cannot initialize MTD partitions\n");
+		fastboot_fail("cannot init mtdparts");
+		return ret;
+	}
+
+	ret = find_dev_and_part(partname, &dev, &pnum, part);
+	if (ret) {
+		pr_err("cannot find partition: '%s'", partname);
+		fastboot_fail("cannot find partition");
+		return ret;
+	}
+
+	if (dev->id->type != MTD_DEV_TYPE_NAND) {
+		pr_err("partition '%s' is not stored on a NAND device",
+		      partname);
+		fastboot_fail("not a NAND device");
+		return -EINVAL;
+	}
+
+	*mtd = get_nand_dev_by_index(dev->id->num);
+
+	return 0;
+}
+
+static int _fb_nand_erase(struct mtd_info *mtd, struct part_info *part)
+{
+	nand_erase_options_t opts;
+	int ret;
+
+	memset(&opts, 0, sizeof(opts));
+	opts.offset = part->offset;
+	opts.length = part->size;
+	opts.quiet = 1;
+
+	printf("Erasing blocks 0x%llx to 0x%llx\n",
+	       part->offset, part->offset + part->size);
+
+	ret = nand_erase_opts(mtd, &opts);
+	if (ret)
+		return ret;
+
+	printf("........ erased 0x%llx bytes from '%s'\n",
+	       part->size, part->name);
+
+	return 0;
+}
+
+static int _fb_nand_write(struct mtd_info *mtd, struct part_info *part,
+			  void *buffer, unsigned int offset,
+			  unsigned int length, size_t *written)
+{
+	int flags = WITH_WR_VERIFY;
+
+#ifdef CONFIG_FASTBOOT_FLASH_NAND_TRIMFFS
+	flags |= WITH_DROP_FFS;
+#endif
+
+	return nand_write_skip_bad(mtd, offset, &length, written,
+				   part->size - (offset - part->offset),
+				   buffer, flags);
+}
+
+static lbaint_t fb_nand_sparse_write(struct sparse_storage *info,
+		lbaint_t blk, lbaint_t blkcnt, const void *buffer)
+{
+	struct fb_nand_sparse *sparse = info->priv;
+	size_t written;
+	int ret;
+
+	ret = _fb_nand_write(sparse->mtd, sparse->part, (void *)buffer,
+			     blk * info->blksz,
+			     blkcnt * info->blksz, &written);
+	if (ret < 0) {
+		printf("Failed to write sparse chunk\n");
+		return ret;
+	}
+
+/* TODO - verify that the value "written" includes the "bad-blocks" ... */
+
+	/*
+	 * the return value must be 'blkcnt' ("good-blocks") plus the
+	 * number of "bad-blocks" encountered within this space...
+	 */
+	return written / info->blksz;
+}
+
+static lbaint_t fb_nand_sparse_reserve(struct sparse_storage *info,
+		lbaint_t blk, lbaint_t blkcnt)
+{
+	int bad_blocks = 0;
+
+/*
+ * TODO - implement a function to determine the total number
+ * of blocks which must be used in order to reserve the specified
+ * number ("blkcnt") of "good-blocks", starting at "blk"...
+ * ( possibly something like the "check_skip_len()" function )
+ */
+
+	/*
+	 * the return value must be 'blkcnt' ("good-blocks") plus the
+	 * number of "bad-blocks" encountered within this space...
+	 */
+	return blkcnt + bad_blocks;
+}
+
+void fb_nand_flash_write(const char *cmd, void *download_buffer,
+			 unsigned int download_bytes)
+{
+	struct part_info *part;
+	struct mtd_info *mtd = NULL;
+	int ret;
+
+	ret = fb_nand_lookup(cmd, &mtd, &part);
+	if (ret) {
+		pr_err("invalid NAND device");
+		fastboot_fail("invalid NAND device");
+		return;
+	}
+
+	ret = board_fastboot_write_partition_setup(part->name);
+	if (ret)
+		return;
+
+	if (is_sparse_image(download_buffer)) {
+		struct fb_nand_sparse sparse_priv;
+		struct sparse_storage sparse;
+
+		sparse_priv.mtd = mtd;
+		sparse_priv.part = part;
+
+		sparse.blksz = mtd->writesize;
+		sparse.start = part->offset / sparse.blksz;
+		sparse.size = part->size / sparse.blksz;
+		sparse.write = fb_nand_sparse_write;
+		sparse.reserve = fb_nand_sparse_reserve;
+		sparse.mssg = fastboot_fail;
+
+		printf("Flashing sparse image at offset " LBAFU "\n",
+		       sparse.start);
+
+		sparse.priv = &sparse_priv;
+		ret = write_sparse_image(&sparse, cmd, download_buffer);
+		if (!ret)
+			fastboot_okay("");
+	} else {
+		printf("Flashing raw image at offset 0x%llx\n",
+		       part->offset);
+
+		ret = _fb_nand_write(mtd, part, download_buffer, part->offset,
+				     download_bytes, NULL);
+
+		printf("........ wrote %u bytes to '%s'\n",
+		       download_bytes, part->name);
+	}
+
+	if (ret) {
+		fastboot_fail("error writing the image");
+		return;
+	}
+
+	fastboot_okay("");
+}
+
+void fb_nand_erase(const char *cmd)
+{
+	struct part_info *part;
+	struct mtd_info *mtd = NULL;
+	int ret;
+
+	ret = fb_nand_lookup(cmd, &mtd, &part);
+	if (ret) {
+		pr_err("invalid NAND device");
+		fastboot_fail("invalid NAND device");
+		return;
+	}
+
+	ret = board_fastboot_erase_partition_setup(part->name);
+	if (ret)
+		return;
+
+	ret = _fb_nand_erase(mtd, part);
+	if (ret) {
+		pr_err("failed erasing from device %s", mtd->name);
+		fastboot_fail("failed erasing from device");
+		return;
+	}
+
+	fastboot_okay("");
+}