[U-Boot] [PATCH v3 2/4] usb/gadget: fastboot: add eMMC support for flash command

Steve Rae
2014-06-26T20:13:22Z

- add support for 'fastboot flash' command for eMMC devices

Signed-off-by: Steve Rae <srae@broadcom.com>
---
I suspect that the "sparse image" handling (ie. the "while (remaining_chunks)" loop)
has been implemented elsewhere -- I need help finding the original code to determine
any licensing issues....
Thanks, Steve

Changes in v3:
- remove most references to 'mmc',
which leaves only one mmc specific function: mmc_get_dev()

Changes in v2:
- split large function into three
- improved handling of response messages
- additional partition size checking when writing sparse image

common/Makefile | 5 ++
common/fb_mmc.c | 190 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
include/fb_mmc.h | 8 +++
3 files changed, 203 insertions(+)
create mode 100644 common/fb_mmc.c
create mode 100644 include/fb_mmc.h

diff --git a/common/Makefile b/common/Makefile
index de5cce8..daebe39 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -266,4 +266,9 @@ obj-$(CONFIG_IO_TRACE) += iotrace.o
obj-y += memsize.o
obj-y += stdio.o

+# This option is not just y/n - it can have a numeric value
+ifdef CONFIG_FASTBOOT_FLASH_MMC_DEV
+obj-y += fb_mmc.o
+endif
+
CFLAGS_env_embedded.o := -Wa,--no-warn -DENV_CRC=$(shell tools/envcrc 2>/dev/null)
diff --git a/common/fb_mmc.c b/common/fb_mmc.c
new file mode 100644
index 0000000..9163d8c
--- /dev/null
+++ b/common/fb_mmc.c
@@ -0,0 +1,190 @@
+/*
+ * Copyright TODO
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <fb_mmc.h>
+#include <part.h>
+#include <sparse_format.h>
+
+/* The 64 defined bytes plus \0 */
+#define RESPONSE_LEN (64 + 1)
+
+static char *response_str;
+
+static void fastboot_resp(const char *s)
+{
+ strncpy(response_str, s, RESPONSE_LEN);
+ response_str[RESPONSE_LEN - 1] = '\0';
+}
+
+static int is_sparse_image(void *buf)
+{
+ sparse_header_t *s_header = (sparse_header_t *)buf;
+
+ if ((le32_to_cpu(s_header->magic) == SPARSE_HEADER_MAGIC) &&
+ (le16_to_cpu(s_header->major_version) == 1))
+ return 1;
+
+ return 0;
+}
+
+static void write_sparse_image(block_dev_desc_t *dev_desc,
+ disk_partition_t *info, const char *part_name,
+ void *buffer, unsigned int download_bytes)
+{
+ lbaint_t blk;
+ lbaint_t blkcnt;
+ lbaint_t blks;
+ sparse_header_t *s_header = (sparse_header_t *)buffer;
+ chunk_header_t *c_header;
+ void *buf;
+ uint32_t blk_sz;
+ uint32_t remaining_chunks;
+ uint32_t bytes_written = 0;
+
+ blk_sz = le32_to_cpu(s_header->blk_sz);
+
+ /* verify s_header->blk_sz is exact multiple of info->blksz */
+ if (blk_sz != (blk_sz & ~(info->blksz - 1))) {
+ printf("%s: Sparse image block size issue [%u]\n",
+ __func__, blk_sz);
+ fastboot_resp("FAILsparse image block size issue");
+ return;
+ }
+
+ if ((le32_to_cpu(s_header->total_blks) * blk_sz) >
+ (info->size * info->blksz)) {
+ printf("%s: Sparse image is too large for the partition\n",
+ __func__);
+ fastboot_resp("FAILsparse image is too large");
+ return;
+ }
+
+ printf("Flashing Sparse Image\n");
+
+ remaining_chunks = le32_to_cpu(s_header->total_chunks);
+ c_header = (chunk_header_t *)(buffer +
+ le16_to_cpu(s_header->file_hdr_sz));
+ blk = info->start;
+ while (remaining_chunks) {
+ blkcnt =
+ (le32_to_cpu(c_header->chunk_sz) * blk_sz) / info->blksz;
+
+ switch (le16_to_cpu(c_header->chunk_type)) {
+ case CHUNK_TYPE_RAW:
+ buf = (void *)c_header +
+ le16_to_cpu(s_header->chunk_hdr_sz);
+
+ if (blk + blkcnt > info->start + info->size) {
+ printf(
+ "%s: Request would exceed partition size!\n",
+ __func__);
+ fastboot_resp(
+ "FAILRequest would exceed partition size!");
+ return;
+ }
+
+ blks = dev_desc->block_write(dev_desc->dev, blk, blkcnt,
+ buf);
+ if (blks != blkcnt) {
+ printf("%s: Write failed " LBAFU "\n",
+ __func__, blks);
+ fastboot_resp("FAILwrite failure");
+ return;
+ }
+
+ bytes_written += blkcnt * info->blksz;
+ break;
+
+ case CHUNK_TYPE_FILL:
+ case CHUNK_TYPE_DONT_CARE:
+ case CHUNK_TYPE_CRC32:
+ /* do nothing */
+ break;
+
+ default:
+ /* error */
+ printf("%s: Unknown chunk type\n", __func__);
+ fastboot_resp("FAILunknown chunk type in sparse image");
+ return;
+ }
+
+ blk += blkcnt;
+ c_header = (chunk_header_t *)((void *)c_header +
+ le32_to_cpu(c_header->total_sz));
+ remaining_chunks--;
+ }
+
+ printf("........ wrote %u bytes to '%s'\n", bytes_written, part_name);
+ fastboot_resp("OKAY");
+}
+
+static void write_raw_image(block_dev_desc_t *dev_desc, disk_partition_t *info,
+ const char *part_name, void *buffer,
+ unsigned int download_bytes)
+{
+ lbaint_t blkcnt;
+ lbaint_t blks;
+
+ /* determine number of blocks to write */
+ blkcnt = ((download_bytes + (info->blksz - 1)) & ~(info->blksz - 1));
+ blkcnt = blkcnt / info->blksz;
+
+ if (blkcnt > info->size) {
+ printf("%s: too large for partition: '%s'\n", __func__,
+ part_name);
+ fastboot_resp("FAILtoo large for partition");
+ return;
+ }
+
+ printf("Flashing Raw Image\n");
+
+ blks = dev_desc->block_write(dev_desc->dev, info->start, blkcnt,
+ buffer);
+ if (blks != blkcnt) {
+ printf("%s: failed writing to device %d\n", __func__,
+ dev_desc->dev);
+ fastboot_resp("FAILfailed writing to device");
+ return;
+ }
+
+ printf("........ wrote " LBAFU " bytes to '%s'\n", blkcnt * info->blksz,
+ part_name);
+ fastboot_resp("OKAY");
+}
+
+void fb_mmc_flash_write(const char *cmd, void *download_buffer,
+ unsigned int download_bytes, char *response)
+{
+ int ret;
+ block_dev_desc_t *dev_desc;
+ disk_partition_t info;
+
+ /* initialize the response buffer */
+ response_str = response;
+
+ dev_desc = mmc_get_dev(CONFIG_FASTBOOT_FLASH_MMC_DEV);
+ if (!dev_desc || dev_desc->type == DEV_TYPE_UNKNOWN) {
+ printf("%s: invalid mmc device\n", __func__);
+ fastboot_resp("FAILinvalid mmc device");
+ return;
+ }
+
+ ret = get_partition_info_efi_by_name(dev_desc, cmd, &info);
+ if (ret) {
+ printf("%s: cannot find partition: '%s'\n", __func__, cmd);
+ fastboot_resp("FAILcannot find partition");
+ return;
+ }
+
+ if (is_sparse_image(download_buffer)) {
+ write_sparse_image(dev_desc, &info, cmd, download_buffer,
+ download_bytes);
+ } else {
+ write_raw_image(dev_desc, &info, cmd, download_buffer,
+ download_bytes);
+ }
+}
diff --git a/include/fb_mmc.h b/include/fb_mmc.h
new file mode 100644
index 0000000..1ad1d13
--- /dev/null
+++ b/include/fb_mmc.h
@@ -0,0 +1,8 @@
+/*
+ * Copyright 2014 Broadcom Corporation.
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+void fb_mmc_flash_write(const char *cmd, void *download_buffer,
+ unsigned int download_bytes, char *response);
--
1.8.5