usb/gadget: fastboot: add eMMC support for flash command

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

Signed-off-by: Steve Rae <srae@broadcom.com>

common/Makefile

@@ -264,4 +264,9 @@ 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)

common/fb_mmc.c

@@ -0,0 +1,80 @@
+/*
+ * Copyright 2014 Broadcom Corporation.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <fb_mmc.h>
+#include <part.h>
+
+/* The 64 defined bytes plus the '\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 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) {
+		error("too large for partition: '%s'\n", part_name);
+		fastboot_resp("FAILtoo large for partition");
+		return;
+	}
+
+	puts("Flashing Raw Image\n");
+
+	blks = dev_desc->block_write(dev_desc->dev, info->start, blkcnt,
+				     buffer);
+	if (blks != blkcnt) {
+		error("failed writing to device %d\n", 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 = get_dev("mmc", CONFIG_FASTBOOT_FLASH_MMC_DEV);
+	if (!dev_desc || dev_desc->type == DEV_TYPE_UNKNOWN) {
+		error("invalid mmc device\n");
+		fastboot_resp("FAILinvalid mmc device");
+		return;
+	}
+
+	ret = get_partition_info_efi_by_name(dev_desc, cmd, &info);
+	if (ret) {
+		error("cannot find partition: '%s'\n", cmd);
+		fastboot_resp("FAILcannot find partition");
+		return;
+	}
+
+	write_raw_image(dev_desc, &info, cmd, download_buffer,
+			download_bytes);
+}

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);