cmd/usb_mass_storage.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2011 Samsung Electronics
   4  * Lukasz Majewski <l.majewski@samsung.com>
   5  *
   6  * Copyright (c) 2015, NVIDIA CORPORATION. All rights reserved.
   7  */
   8
   9 #include <errno.h>
  10 #include <common.h>
  11 #include <command.h>
  12 #include <console.h>
  13 #include <g_dnl.h>
  14 #include <part.h>
  15 #include <usb.h>
  16 #include <usb_mass_storage.h>
  17
  18 static int ums_read_sector(struct ums *ums_dev,
  19                            ulong start, lbaint_t blkcnt, void *buf)
  20 {
  21         struct blk_desc *block_dev = &ums_dev->block_dev;
  22         lbaint_t blkstart = start + ums_dev->start_sector;
  23
  24         return blk_dread(block_dev, blkstart, blkcnt, buf);
  25 }
  26
  27 static int ums_write_sector(struct ums *ums_dev,
  28                             ulong start, lbaint_t blkcnt, const void *buf)
  29 {
  30         struct blk_desc *block_dev = &ums_dev->block_dev;
  31         lbaint_t blkstart = start + ums_dev->start_sector;
  32
  33         return blk_dwrite(block_dev, blkstart, blkcnt, buf);
  34 }
  35
  36 static struct ums *ums;
  37 static int ums_count;
  38
  39 static void ums_fini(void)
  40 {
  41         int i;
  42
  43         for (i = 0; i < ums_count; i++)
  44                 free((void *)ums[i].name);
  45         free(ums);
  46         ums = NULL;
  47         ums_count = 0;
  48 }
  49
  50 #define UMS_NAME_LEN 16
  51
  52 static int ums_init(const char *devtype, const char *devnums_part_str)
  53 {
  54         char *s, *t, *devnum_part_str, *name;
  55         struct blk_desc *block_dev;
  56         disk_partition_t info;
  57         int partnum;
  58         int ret = -1;
  59         struct ums *ums_new;
  60
  61         s = strdup(devnums_part_str);
  62         if (!s)
  63                 return -1;
  64
  65         t = s;
  66         ums_count = 0;
  67
  68         for (;;) {
  69                 devnum_part_str = strsep(&t, ",");
  70                 if (!devnum_part_str)
  71                         break;
  72
  73                 partnum = blk_get_device_part_str(devtype, devnum_part_str,
  74                                         &block_dev, &info, 1);
  75
  76                 if (partnum < 0)
  77                         goto cleanup;
  78
  79                 /* Check if the argument is in legacy format. If yes,
  80                  * expose all partitions by setting the partnum = 0
  81                  * e.g. ums 0 mmc 0
  82                  */
  83                 if (!strchr(devnum_part_str, ':'))
  84                         partnum = 0;
  85
  86                 /* f_mass_storage.c assumes SECTOR_SIZE sectors */
  87                 if (block_dev->blksz != SECTOR_SIZE)
  88                         goto cleanup;
  89
  90                 ums_new = realloc(ums, (ums_count + 1) * sizeof(*ums));
  91                 if (!ums_new)
  92                         goto cleanup;
  93                 ums = ums_new;
  94
  95                 /* if partnum = 0, expose all partitions */
  96                 if (partnum == 0) {
  97                         ums[ums_count].start_sector = 0;
  98                         ums[ums_count].num_sectors = block_dev->lba;
  99                 } else {
 100                         ums[ums_count].start_sector = info.start;
 101                         ums[ums_count].num_sectors = info.size;
 102                 }
 103
 104                 ums[ums_count].read_sector = ums_read_sector;
 105                 ums[ums_count].write_sector = ums_write_sector;
 106
 107                 name = malloc(UMS_NAME_LEN);
 108                 if (!name)
 109                         goto cleanup;
 110                 snprintf(name, UMS_NAME_LEN, "UMS disk %d", ums_count);
 111                 ums[ums_count].name = name;
 112                 ums[ums_count].block_dev = *block_dev;
 113
 114                 printf("UMS: LUN %d, dev %d, hwpart %d, sector %#x, count %#x\n",
 115                        ums_count, ums[ums_count].block_dev.devnum,
 116                        ums[ums_count].block_dev.hwpart,
 117                        ums[ums_count].start_sector,
 118                        ums[ums_count].num_sectors);
 119
 120                 ums_count++;
 121         }
 122
 123         if (ums_count)
 124                 ret = 0;
 125
 126 cleanup:
 127         free(s);
 128
 129         if (ret < 0)
 130                 ums_fini();
 131
 132         return ret;
 133 }
 134
 135 static int do_usb_mass_storage(cmd_tbl_t *cmdtp, int flag,
 136                                int argc, char * const argv[])
 137 {
 138         const char *usb_controller;
 139         const char *devtype;
 140         const char *devnum;
 141         unsigned int controller_index;
 142         int rc;
 143         int cable_ready_timeout __maybe_unused;
 144
 145         if (argc < 3)
 146                 return CMD_RET_USAGE;
 147
 148         usb_controller = argv[1];
 149         if (argc >= 4) {
 150                 devtype = argv[2];
 151                 devnum  = argv[3];
 152         } else {
 153                 devtype = "mmc";
 154                 devnum  = argv[2];
 155         }
 156
 157         rc = ums_init(devtype, devnum);
 158         if (rc < 0)
 159                 return CMD_RET_FAILURE;
 160
 161         controller_index = (unsigned int)(simple_strtoul(
 162                                 usb_controller, NULL, 0));
 163         if (usb_gadget_initialize(controller_index)) {
 164                 pr_err("Couldn't init USB controller.\n");
 165                 rc = CMD_RET_FAILURE;
 166                 goto cleanup_ums_init;
 167         }
 168
 169         rc = fsg_init(ums, ums_count);
 170         if (rc) {
 171                 pr_err("fsg_init failed\n");
 172                 rc = CMD_RET_FAILURE;
 173                 goto cleanup_board;
 174         }
 175
 176         rc = g_dnl_register("usb_dnl_ums");
 177         if (rc) {
 178                 pr_err("g_dnl_register failed\n");
 179                 rc = CMD_RET_FAILURE;
 180                 goto cleanup_board;
 181         }
 182
 183         /* Timeout unit: seconds */
 184         cable_ready_timeout = UMS_CABLE_READY_TIMEOUT;
 185
 186         if (!g_dnl_board_usb_cable_connected()) {
 187                 /*
 188                  * Won't execute if we don't know whether the cable is
 189                  * connected.
 190                  */
 191                 puts("Please connect USB cable.\n");
 192
 193                 while (!g_dnl_board_usb_cable_connected()) {
 194                         if (ctrlc()) {
 195                                 puts("\rCTRL+C - Operation aborted.\n");
 196                                 rc = CMD_RET_SUCCESS;
 197                                 goto cleanup_register;
 198                         }
 199                         if (!cable_ready_timeout) {
 200                                 puts("\rUSB cable not detected.\n" \
 201                                      "Command exit.\n");
 202                                 rc = CMD_RET_SUCCESS;
 203                                 goto cleanup_register;
 204                         }
 205
 206                         printf("\rAuto exit in: %.2d s.", cable_ready_timeout);
 207                         mdelay(1000);
 208                         cable_ready_timeout--;
 209                 }
 210                 puts("\r\n");
 211         }
 212
 213         while (1) {
 214                 usb_gadget_handle_interrupts(controller_index);
 215
 216                 rc = fsg_main_thread(NULL);
 217                 if (rc) {
 218                         /* Check I/O error */
 219                         if (rc == -EIO)
 220                                 printf("\rCheck USB cable connection\n");
 221
 222                         /* Check CTRL+C */
 223                         if (rc == -EPIPE)
 224                                 printf("\rCTRL+C - Operation aborted\n");
 225
 226                         rc = CMD_RET_SUCCESS;
 227                         goto cleanup_register;
 228                 }
 229         }
 230
 231 cleanup_register:
 232         g_dnl_unregister();
 233 cleanup_board:
 234         usb_gadget_release(controller_index);
 235 cleanup_ums_init:
 236         ums_fini();
 237
 238         return rc;
 239 }
 240
 241 U_BOOT_CMD(ums, 4, 1, do_usb_mass_storage,
 242         "Use the UMS [USB Mass Storage]",
 243         "<USB_controller> [<devtype>] <dev[:part]>  e.g. ums 0 mmc 0\n"
 244         "    devtype defaults to mmc"
 245 );