drivers/block/blk_legacy.c

   1 /*
   2  * Copyright (C) 2016 Google, Inc
   3  * Written by Simon Glass <sjg@chromium.org>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <linux/err.h>
  10
  11 struct blk_driver *blk_driver_lookup_type(int if_type)
  12 {
  13         struct blk_driver *drv = ll_entry_start(struct blk_driver, blk_driver);
  14         const int n_ents = ll_entry_count(struct blk_driver, blk_driver);
  15         struct blk_driver *entry;
  16
  17         for (entry = drv; entry != drv + n_ents; entry++) {
  18                 if (if_type == entry->if_type)
  19                         return entry;
  20         }
  21
  22         /* Not found */
  23         return NULL;
  24 }
  25
  26 static struct blk_driver *blk_driver_lookup_typename(const char *if_typename)
  27 {
  28         struct blk_driver *drv = ll_entry_start(struct blk_driver, blk_driver);
  29         const int n_ents = ll_entry_count(struct blk_driver, blk_driver);
  30         struct blk_driver *entry;
  31
  32         for (entry = drv; entry != drv + n_ents; entry++) {
  33                 if (!strcmp(if_typename, entry->if_typename))
  34                         return entry;
  35         }
  36
  37         /* Not found */
  38         return NULL;
  39 }
  40
  41 const char *blk_get_if_type_name(enum if_type if_type)
  42 {
  43         struct blk_driver *drv = blk_driver_lookup_type(if_type);
  44
  45         return drv ? drv->if_typename : NULL;
  46 }
  47
  48 /**
  49  * get_desc() - Get the block device descriptor for the given device number
  50  *
  51  * @drv:        Legacy block driver
  52  * @devnum:     Device number (0 = first)
  53  * @descp:      Returns block device descriptor on success
  54  * @return 0 on success, -ENODEV if there is no such device, -ENOSYS if the
  55  * driver does not provide a way to find a device, or other -ve on other
  56  * error.
  57  */
  58 static int get_desc(struct blk_driver *drv, int devnum, struct blk_desc **descp)
  59 {
  60         if (drv->desc) {
  61                 if (devnum < 0 || devnum >= drv->max_devs)
  62                         return -ENODEV;
  63                 *descp = &drv->desc[devnum];
  64                 return 0;
  65         }
  66         if (!drv->get_dev)
  67                 return -ENOSYS;
  68
  69         return drv->get_dev(devnum, descp);
  70 }
  71
  72 #ifdef HAVE_BLOCK_DEVICE
  73 int blk_list_part(enum if_type if_type)
  74 {
  75         struct blk_driver *drv;
  76         struct blk_desc *desc;
  77         int devnum, ok;
  78         bool first = true;
  79
  80         drv = blk_driver_lookup_type(if_type);
  81         if (!drv)
  82                 return -ENOSYS;
  83         for (ok = 0, devnum = 0; devnum < drv->max_devs; ++devnum) {
  84                 if (get_desc(drv, devnum, &desc))
  85                         continue;
  86                 if (desc->part_type != PART_TYPE_UNKNOWN) {
  87                         ++ok;
  88                         if (!first)
  89                                 putc('\n');
  90                         part_print(desc);
  91                         first = false;
  92                 }
  93         }
  94         if (!ok)
  95                 return -ENODEV;
  96
  97         return 0;
  98 }
  99
 100 int blk_print_part_devnum(enum if_type if_type, int devnum)
 101 {
 102         struct blk_driver *drv = blk_driver_lookup_type(if_type);
 103         struct blk_desc *desc;
 104         int ret;
 105
 106         if (!drv)
 107                 return -ENOSYS;
 108         ret = get_desc(drv, devnum, &desc);
 109         if (ret)
 110                 return ret;
 111         if (desc->type == DEV_TYPE_UNKNOWN)
 112                 return -ENOENT;
 113         part_print(desc);
 114
 115         return 0;
 116 }
 117
 118 void blk_list_devices(enum if_type if_type)
 119 {
 120         struct blk_driver *drv = blk_driver_lookup_type(if_type);
 121         struct blk_desc *desc;
 122         int i;
 123
 124         if (!drv)
 125                 return;
 126         for (i = 0; i < drv->max_devs; ++i) {
 127                 if (get_desc(drv, i, &desc))
 128                         continue;
 129                 if (desc->type == DEV_TYPE_UNKNOWN)
 130                         continue;  /* list only known devices */
 131                 printf("Device %d: ", i);
 132                 dev_print(desc);
 133         }
 134 }
 135
 136 int blk_print_device_num(enum if_type if_type, int devnum)
 137 {
 138         struct blk_driver *drv = blk_driver_lookup_type(if_type);
 139         struct blk_desc *desc;
 140         int ret;
 141
 142         if (!drv)
 143                 return -ENOSYS;
 144         ret = get_desc(drv, devnum, &desc);
 145         if (ret)
 146                 return ret;
 147         printf("\n%s device %d: ", drv->if_typename, devnum);
 148         dev_print(desc);
 149
 150         return 0;
 151 }
 152
 153 int blk_show_device(enum if_type if_type, int devnum)
 154 {
 155         struct blk_driver *drv = blk_driver_lookup_type(if_type);
 156         struct blk_desc *desc;
 157         int ret;
 158
 159         if (!drv)
 160                 return -ENOSYS;
 161         printf("\nDevice %d: ", devnum);
 162         if (devnum >= drv->max_devs) {
 163                 puts("unknown device\n");
 164                 return -ENODEV;
 165         }
 166         ret = get_desc(drv, devnum, &desc);
 167         if (ret)
 168                 return ret;
 169         dev_print(desc);
 170
 171         if (desc->type == DEV_TYPE_UNKNOWN)
 172                 return -ENOENT;
 173
 174         return 0;
 175 }
 176 #endif /* HAVE_BLOCK_DEVICE */
 177
 178 struct blk_desc *blk_get_devnum_by_type(enum if_type if_type, int devnum)
 179 {
 180         struct blk_driver *drv = blk_driver_lookup_type(if_type);
 181         struct blk_desc *desc;
 182
 183         if (!drv)
 184                 return NULL;
 185
 186         if (get_desc(drv, devnum, &desc))
 187                 return NULL;
 188
 189         return desc;
 190 }
 191
 192 int blk_dselect_hwpart(struct blk_desc *desc, int hwpart)
 193 {
 194         struct blk_driver *drv = blk_driver_lookup_type(desc->if_type);
 195
 196         if (!drv)
 197                 return -ENOSYS;
 198         if (drv->select_hwpart)
 199                 return drv->select_hwpart(desc, hwpart);
 200
 201         return 0;
 202 }
 203
 204 struct blk_desc *blk_get_devnum_by_typename(const char *if_typename, int devnum)
 205 {
 206         struct blk_driver *drv = blk_driver_lookup_typename(if_typename);
 207         struct blk_desc *desc;
 208
 209         if (!drv)
 210                 return NULL;
 211
 212         if (get_desc(drv, devnum, &desc))
 213                 return NULL;
 214
 215         return desc;
 216 }
 217
 218 ulong blk_read_devnum(enum if_type if_type, int devnum, lbaint_t start,
 219                       lbaint_t blkcnt, void *buffer)
 220 {
 221         struct blk_driver *drv = blk_driver_lookup_type(if_type);
 222         struct blk_desc *desc;
 223         ulong n;
 224         int ret;
 225
 226         if (!drv)
 227                 return -ENOSYS;
 228         ret = get_desc(drv, devnum, &desc);
 229         if (ret)
 230                 return ret;
 231         n = desc->block_read(desc, start, blkcnt, buffer);
 232         if (IS_ERR_VALUE(n))
 233                 return n;
 234
 235         return n;
 236 }
 237
 238 ulong blk_write_devnum(enum if_type if_type, int devnum, lbaint_t start,
 239                        lbaint_t blkcnt, const void *buffer)
 240 {
 241         struct blk_driver *drv = blk_driver_lookup_type(if_type);
 242         struct blk_desc *desc;
 243         int ret;
 244
 245         if (!drv)
 246                 return -ENOSYS;
 247         ret = get_desc(drv, devnum, &desc);
 248         if (ret)
 249                 return ret;
 250         return desc->block_write(desc, start, blkcnt, buffer);
 251 }
 252
 253 int blk_select_hwpart_devnum(enum if_type if_type, int devnum, int hwpart)
 254 {
 255         struct blk_driver *drv = blk_driver_lookup_type(if_type);
 256         struct blk_desc *desc;
 257         int ret;
 258
 259         if (!drv)
 260                 return -ENOSYS;
 261         ret = get_desc(drv, devnum, &desc);
 262         if (ret)
 263                 return ret;
 264         return drv->select_hwpart(desc, hwpart);
 265 }