drivers/block/sandbox.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2013 Henrik Nordstrom <henrik@henriknordstrom.net>
   4  */
   5
   6 #include <common.h>
   7 #include <blk.h>
   8 #include <dm.h>
   9 #include <fdtdec.h>
  10 #include <part.h>
  11 #include <os.h>
  12 #include <malloc.h>
  13 #include <sandboxblockdev.h>
  14 #include <dm/device_compat.h>
  15 #include <linux/errno.h>
  16 #include <dm/device-internal.h>
  17
  18 DECLARE_GLOBAL_DATA_PTR;
  19
  20 #ifndef CONFIG_BLK
  21 static struct host_block_dev host_devices[CONFIG_HOST_MAX_DEVICES];
  22
  23 static struct host_block_dev *find_host_device(int dev)
  24 {
  25         if (dev >= 0 && dev < CONFIG_HOST_MAX_DEVICES)
  26                 return &host_devices[dev];
  27
  28         return NULL;
  29 }
  30 #endif
  31
  32 #ifdef CONFIG_BLK
  33 static unsigned long host_block_read(struct udevice *dev,
  34                                      unsigned long start, lbaint_t blkcnt,
  35                                      void *buffer)
  36 {
  37         struct host_block_dev *host_dev = dev_get_plat(dev);
  38         struct blk_desc *block_dev = dev_get_uclass_plat(dev);
  39
  40 #else
  41 static unsigned long host_block_read(struct blk_desc *block_dev,
  42                                      unsigned long start, lbaint_t blkcnt,
  43                                      void *buffer)
  44 {
  45         int dev = block_dev->devnum;
  46         struct host_block_dev *host_dev = find_host_device(dev);
  47
  48         if (!host_dev)
  49                 return -1;
  50 #endif
  51
  52         if (os_lseek(host_dev->fd, start * block_dev->blksz, OS_SEEK_SET) ==
  53                         -1) {
  54                 printf("ERROR: Invalid block %lx\n", start);
  55                 return -1;
  56         }
  57         ssize_t len = os_read(host_dev->fd, buffer, blkcnt * block_dev->blksz);
  58         if (len >= 0)
  59                 return len / block_dev->blksz;
  60         return -1;
  61 }
  62
  63 #ifdef CONFIG_BLK
  64 static unsigned long host_block_write(struct udevice *dev,
  65                                       unsigned long start, lbaint_t blkcnt,
  66                                       const void *buffer)
  67 {
  68         struct host_block_dev *host_dev = dev_get_plat(dev);
  69         struct blk_desc *block_dev = dev_get_uclass_plat(dev);
  70 #else
  71 static unsigned long host_block_write(struct blk_desc *block_dev,
  72                                       unsigned long start, lbaint_t blkcnt,
  73                                       const void *buffer)
  74 {
  75         int dev = block_dev->devnum;
  76         struct host_block_dev *host_dev = find_host_device(dev);
  77 #endif
  78
  79         if (os_lseek(host_dev->fd, start * block_dev->blksz, OS_SEEK_SET) ==
  80                         -1) {
  81                 printf("ERROR: Invalid block %lx\n", start);
  82                 return -1;
  83         }
  84         ssize_t len = os_write(host_dev->fd, buffer, blkcnt * block_dev->blksz);
  85         if (len >= 0)
  86                 return len / block_dev->blksz;
  87         return -1;
  88 }
  89
  90 #ifdef CONFIG_BLK
  91 int host_dev_bind(int devnum, char *filename)
  92 {
  93         struct host_block_dev *host_dev;
  94         struct udevice *dev;
  95         struct blk_desc *desc;
  96         char dev_name[20], *str, *fname;
  97         int ret, fd;
  98
  99         /* Remove and unbind the old device, if any */
 100         ret = blk_get_device(IF_TYPE_HOST, devnum, &dev);
 101         if (ret == 0) {
 102                 ret = device_remove(dev, DM_REMOVE_NORMAL);
 103                 if (ret)
 104                         return ret;
 105                 ret = device_unbind(dev);
 106                 if (ret)
 107                         return ret;
 108         } else if (ret != -ENODEV) {
 109                 return ret;
 110         }
 111
 112         if (!filename)
 113                 return 0;
 114
 115         snprintf(dev_name, sizeof(dev_name), "host%d", devnum);
 116         str = strdup(dev_name);
 117         if (!str)
 118                 return -ENOMEM;
 119         fname = strdup(filename);
 120         if (!fname) {
 121                 free(str);
 122                 return -ENOMEM;
 123         }
 124
 125         fd = os_open(filename, OS_O_RDWR);
 126         if (fd == -1) {
 127                 printf("Failed to access host backing file '%s'\n", filename);
 128                 ret = -ENOENT;
 129                 goto err;
 130         }
 131         ret = blk_create_device(gd->dm_root, "sandbox_host_blk", str,
 132                                 IF_TYPE_HOST, devnum, 512,
 133                                 os_lseek(fd, 0, OS_SEEK_END) / 512, &dev);
 134         if (ret)
 135                 goto err_file;
 136
 137         host_dev = dev_get_plat(dev);
 138         host_dev->fd = fd;
 139         host_dev->filename = fname;
 140
 141         ret = device_probe(dev);
 142         if (ret) {
 143                 device_unbind(dev);
 144                 goto err_file;
 145         }
 146
 147         desc = blk_get_devnum_by_type(IF_TYPE_HOST, devnum);
 148         desc->removable = 1;
 149         snprintf(desc->vendor, BLK_VEN_SIZE, "U-Boot");
 150         snprintf(desc->product, BLK_PRD_SIZE, "hostfile");
 151         snprintf(desc->revision, BLK_REV_SIZE, "1.0");
 152
 153         return 0;
 154 err_file:
 155         os_close(fd);
 156 err:
 157         free(fname);
 158         free(str);
 159         return ret;
 160 }
 161 #else
 162 int host_dev_bind(int dev, char *filename)
 163 {
 164         struct host_block_dev *host_dev = find_host_device(dev);
 165
 166         if (!host_dev)
 167                 return -1;
 168         if (host_dev->blk_dev.priv) {
 169                 os_close(host_dev->fd);
 170                 host_dev->blk_dev.priv = NULL;
 171         }
 172         if (host_dev->filename)
 173                 free(host_dev->filename);
 174         if (filename && *filename) {
 175                 host_dev->filename = strdup(filename);
 176         } else {
 177                 host_dev->filename = NULL;
 178                 return 0;
 179         }
 180
 181         host_dev->fd = os_open(host_dev->filename, OS_O_RDWR);
 182         if (host_dev->fd == -1) {
 183                 printf("Failed to access host backing file '%s'\n",
 184                        host_dev->filename);
 185                 return 1;
 186         }
 187
 188         struct blk_desc *blk_dev = &host_dev->blk_dev;
 189         blk_dev->if_type = IF_TYPE_HOST;
 190         blk_dev->priv = host_dev;
 191         blk_dev->blksz = 512;
 192         blk_dev->lba = os_lseek(host_dev->fd, 0, OS_SEEK_END) / blk_dev->blksz;
 193         blk_dev->block_read = host_block_read;
 194         blk_dev->block_write = host_block_write;
 195         blk_dev->devnum = dev;
 196         blk_dev->part_type = PART_TYPE_UNKNOWN;
 197         blk_dev->removable = 1;
 198         snprintf(blk_dev->vendor, BLK_VEN_SIZE, "U-Boot");
 199         snprintf(blk_dev->product, BLK_PRD_SIZE, "hostfile");
 200         snprintf(blk_dev->revision, BLK_REV_SIZE, "1.0");
 201         part_init(blk_dev);
 202
 203         return 0;
 204 }
 205 #endif
 206
 207 int host_get_dev_err(int devnum, struct blk_desc **blk_devp)
 208 {
 209 #ifdef CONFIG_BLK
 210         struct udevice *dev;
 211         int ret;
 212
 213         ret = blk_get_device(IF_TYPE_HOST, devnum, &dev);
 214         if (ret)
 215                 return ret;
 216         *blk_devp = dev_get_uclass_plat(dev);
 217 #else
 218         struct host_block_dev *host_dev = find_host_device(devnum);
 219
 220         if (!host_dev)
 221                 return -ENODEV;
 222
 223         if (!host_dev->blk_dev.priv)
 224                 return -ENOENT;
 225
 226         *blk_devp = &host_dev->blk_dev;
 227 #endif
 228
 229         return 0;
 230 }
 231
 232 #ifdef CONFIG_BLK
 233 static const struct blk_ops sandbox_host_blk_ops = {
 234         .read   = host_block_read,
 235         .write  = host_block_write,
 236 };
 237
 238 U_BOOT_DRIVER(sandbox_host_blk) = {
 239         .name           = "sandbox_host_blk",
 240         .id             = UCLASS_BLK,
 241         .ops            = &sandbox_host_blk_ops,
 242         .plat_auto      = sizeof(struct host_block_dev),
 243 };
 244 #else
 245 U_BOOT_LEGACY_BLK(sandbox_host) = {
 246         .if_typename    = "host",
 247         .if_type        = IF_TYPE_HOST,
 248         .max_devs       = CONFIG_HOST_MAX_DEVICES,
 249         .get_dev        = host_get_dev_err,
 250 };
 251 #endif