ums: support multiple LUNs at once

Extend the ums command to accept a list of block devices. Each of these
will be exported as a separate LUN. An example use-case would be:

ums 0 mmc 0,0.1,0.2

... which would export LUNs for eMMC 0's user data, boot0, and boot1 HW
partitions. This is useful since it allows the host access to everything
on the eMMC without having to somehow stop the ums command from executing
and restart it with different parameters.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Tom Rini <trini@konsulko.com>

1 files changed, 103 insertions, 32 deletions

diff --git a/common/cmd_usb_mass_storage.c b/common/cmd_usb_mass_storage.c
index f4bafec..0415591 100644
--- a/common/cmd_usb_mass_storage.c
+++ b/common/cmd_usb_mass_storage.c
@@ -2,6 +2,8 @@
  * Copyright (C) 2011 Samsung Electronics
  * Lukasz Majewski <l.majewski@samsung.com>
  *
+ * Copyright (c) 2015, NVIDIA CORPORATION. All rights reserved.
+ *
  * SPDX-License-Identifier:	GPL-2.0+
  */
 
@@ -17,7 +19,7 @@
 static int ums_read_sector(struct ums *ums_dev,
 			   ulong start, lbaint_t blkcnt, void *buf)
 {
-	block_dev_desc_t *block_dev = ums_dev->block_dev;
+	block_dev_desc_t *block_dev = &ums_dev->block_dev;
 	lbaint_t blkstart = start + ums_dev->start_sector;
 
 	return block_dev->block_read(block_dev, blkstart, blkcnt, buf);
@@ -26,39 +28,98 @@ static int ums_read_sector(struct ums *ums_dev,
 static int ums_write_sector(struct ums *ums_dev,
 			    ulong start, lbaint_t blkcnt, const void *buf)
 {
-	block_dev_desc_t *block_dev = ums_dev->block_dev;
+	block_dev_desc_t *block_dev = &ums_dev->block_dev;
 	lbaint_t blkstart = start + ums_dev->start_sector;
 
 	return block_dev->block_write(block_dev, blkstart, blkcnt, buf);
 }
 
-static struct ums ums_dev = {
-	.read_sector = ums_read_sector,
-	.write_sector = ums_write_sector,
-	.name = "UMS disk",
-};
+static struct ums *ums;
+static int ums_count;
+
+static void ums_fini(void)
+{
+	int i;
+
+	for (i = 0; i < ums_count; i++)
+		free((void *)ums[i].name);
+	free(ums);
+	ums = 0;
+	ums_count = 0;
+}
+
+#define UMS_NAME_LEN 16
 
-struct ums *ums_init(const char *devtype, const char *devnum)
+static int ums_init(const char *devtype, const char *devnums)
 {
+	char *s, *t, *devnum, *name;
 	block_dev_desc_t *block_dev;
 	int ret;
+	struct ums *ums_new;
 
-	ret = get_device(devtype, devnum, &block_dev);
-	if (ret < 0)
-		return NULL;
+	s = strdup(devnums);
+	if (!s)
+		return -1;
+
+	t = s;
+	ums_count = 0;
+
+	for (;;) {
+		devnum = strsep(&t, ",");
+		if (!devnum)
+			break;
+
+		ret = get_device(devtype, devnum, &block_dev);
+		if (ret < 0)
+			goto cleanup;
+
+		/* f_mass_storage.c assumes SECTOR_SIZE sectors */
+		if (block_dev->blksz != SECTOR_SIZE) {
+			ret = -1;
+			goto cleanup;
+		}
 
-	/* f_mass_storage.c assumes SECTOR_SIZE sectors */
-	if (block_dev->blksz != SECTOR_SIZE)
-		return NULL;
+		ums_new = realloc(ums, (ums_count + 1) * sizeof(*ums));
+		if (!ums_new) {
+			ret = -1;
+			goto cleanup;
+		}
+		ums = ums_new;
+
+		ums[ums_count].read_sector = ums_read_sector;
+		ums[ums_count].write_sector = ums_write_sector;
+		ums[ums_count].start_sector = 0;
+		ums[ums_count].num_sectors = block_dev->lba;
+		name = malloc(UMS_NAME_LEN);
+		if (!name) {
+			ret = -1;
+			goto cleanup;
+		}
+		snprintf(name, UMS_NAME_LEN, "UMS disk %d", ums_count);
+		ums[ums_count].name = name;
+		ums[ums_count].block_dev = *block_dev;
+
+		printf("UMS: LUN %d, dev %d, hwpart %d, sector %#x, count %#x\n",
+		       ums_count, ums[ums_count].block_dev.dev,
+		       ums[ums_count].block_dev.hwpart,
+		       ums[ums_count].start_sector,
+		       ums[ums_count].num_sectors);
+
+		ums_count++;
+	}
+
+	if (!ums_count)
+		ret = -1;
+	else
+		ret = 0;
 
-	ums_dev.block_dev = block_dev;
-	ums_dev.start_sector = 0;
-	ums_dev.num_sectors = block_dev->lba;
+cleanup:
+	free(s);
 
-	printf("UMS: disk start sector: %#x, count: %#x\n",
-	       ums_dev.start_sector, ums_dev.num_sectors);
+	if (ret < 0)
+		ums_fini();
 
-	return &ums_dev;
+	return ret;
 }
 
 int do_usb_mass_storage(cmd_tbl_t *cmdtp, int flag,
@@ -67,7 +128,6 @@ int do_usb_mass_storage(cmd_tbl_t *cmdtp, int flag,
 	const char *usb_controller;
 	const char *devtype;
 	const char *devnum;
-	struct ums *ums;
 	unsigned int controller_index;
 	int rc;
 	int cable_ready_timeout __maybe_unused;
@@ -84,27 +144,30 @@ int do_usb_mass_storage(cmd_tbl_t *cmdtp, int flag,
 		devnum  = argv[2];
 	}
 
-	ums = ums_init(devtype, devnum);
-	if (!ums)
+	rc = ums_init(devtype, devnum);
+	if (rc < 0)
 		return CMD_RET_FAILURE;
 
 	controller_index = (unsigned int)(simple_strtoul(
 				usb_controller,	NULL, 0));
 	if (board_usb_init(controller_index, USB_INIT_DEVICE)) {
 		error("Couldn't init USB controller.");
-		return CMD_RET_FAILURE;
+		rc = CMD_RET_FAILURE;
+		goto cleanup_ums_init;
 	}
 
-	rc = fsg_init(ums);
+	rc = fsg_init(ums, ums_count);
 	if (rc) {
 		error("fsg_init failed");
-		return CMD_RET_FAILURE;
+		rc = CMD_RET_FAILURE;
+		goto cleanup_board;
 	}
 
 	rc = g_dnl_register("usb_dnl_ums");
 	if (rc) {
 		error("g_dnl_register failed");
-		return CMD_RET_FAILURE;
+		rc = CMD_RET_FAILURE;
+		goto cleanup_board;
 	}
 
 	/* Timeout unit: seconds */
@@ -120,12 +183,14 @@ int do_usb_mass_storage(cmd_tbl_t *cmdtp, int flag,
 		while (!g_dnl_board_usb_cable_connected()) {
 			if (ctrlc()) {
 				puts("\rCTRL+C - Operation aborted.\n");
-				goto exit;
+				rc = CMD_RET_SUCCESS;
+				goto cleanup_register;
 			}
 			if (!cable_ready_timeout) {
 				puts("\rUSB cable not detected.\n" \
 				     "Command exit.\n");
-				goto exit;
+				rc = CMD_RET_SUCCESS;
+				goto cleanup_register;
 			}
 
 			printf("\rAuto exit in: %.2d s.", cable_ready_timeout);
@@ -148,13 +213,19 @@ int do_usb_mass_storage(cmd_tbl_t *cmdtp, int flag,
 			if (rc == -EPIPE)
 				printf("\rCTRL+C - Operation aborted\n");
 
-			goto exit;
+			rc = CMD_RET_SUCCESS;
+			goto cleanup_register;
 		}
 	}
-exit:
+
+cleanup_register:
 	g_dnl_unregister();
+cleanup_board:
 	board_usb_cleanup(controller_index, USB_INIT_DEVICE);
-	return CMD_RET_SUCCESS;
+cleanup_ums_init:
+	ums_fini();
+
+	return rc;
 }
 
 U_BOOT_CMD(ums, 4, 1, do_usb_mass_storage,