git.sur5r.net Git - u-boot/blob - drivers/block/sandbox.c

   1 /*
   2  * Copyright (C) 2013 Henrik Nordstrom <henrik@henriknordstrom.net>
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <config.h>
   8 #include <common.h>
   9 #include <part.h>
  10 #include <os.h>
  11 #include <malloc.h>
  12 #include <sandboxblockdev.h>
  13 #include <asm/errno.h>
  14
  15 static struct host_block_dev host_devices[CONFIG_HOST_MAX_DEVICES];
  16
  17 static struct host_block_dev *find_host_device(int dev)
  18 {
  19         if (dev >= 0 && dev < CONFIG_HOST_MAX_DEVICES)
  20                 return &host_devices[dev];
  21
  22         return NULL;
  23 }
  24
  25 static unsigned long host_block_read(struct blk_desc *block_dev,
  26                                      unsigned long start, lbaint_t blkcnt,
  27                                      void *buffer)
  28 {
  29         int dev = block_dev->devnum;
  30         struct host_block_dev *host_dev = find_host_device(dev);
  31
  32         if (!host_dev)
  33                 return -1;
  34
  35         if (os_lseek(host_dev->fd, start * block_dev->blksz, OS_SEEK_SET) ==
  36                         -1) {
  37                 printf("ERROR: Invalid block %lx\n", start);
  38                 return -1;
  39         }
  40         ssize_t len = os_read(host_dev->fd, buffer, blkcnt * block_dev->blksz);
  41         if (len >= 0)
  42                 return len / block_dev->blksz;
  43         return -1;
  44 }
  45
  46 static unsigned long host_block_write(struct blk_desc *block_dev,
  47                                       unsigned long start, lbaint_t blkcnt,
  48                                       const void *buffer)
  49 {
  50         int dev = block_dev->devnum;
  51         struct host_block_dev *host_dev = find_host_device(dev);
  52
  53         if (os_lseek(host_dev->fd, start * block_dev->blksz, OS_SEEK_SET) ==
  54                         -1) {
  55                 printf("ERROR: Invalid block %lx\n", start);
  56                 return -1;
  57         }
  58         ssize_t len = os_write(host_dev->fd, buffer, blkcnt * block_dev->blksz);
  59         if (len >= 0)
  60                 return len / block_dev->blksz;
  61         return -1;
  62 }
  63
  64 int host_dev_bind(int dev, char *filename)
  65 {
  66         struct host_block_dev *host_dev = find_host_device(dev);
  67
  68         if (!host_dev)
  69                 return -1;
  70         if (host_dev->blk_dev.priv) {
  71                 os_close(host_dev->fd);
  72                 host_dev->blk_dev.priv = NULL;
  73         }
  74         if (host_dev->filename)
  75                 free(host_dev->filename);
  76         if (filename && *filename) {
  77                 host_dev->filename = strdup(filename);
  78         } else {
  79                 host_dev->filename = NULL;
  80                 return 0;
  81         }
  82
  83         host_dev->fd = os_open(host_dev->filename, OS_O_RDWR);
  84         if (host_dev->fd == -1) {
  85                 printf("Failed to access host backing file '%s'\n",
  86                        host_dev->filename);
  87                 return 1;
  88         }
  89
  90         struct blk_desc *blk_dev = &host_dev->blk_dev;
  91         blk_dev->if_type = IF_TYPE_HOST;
  92         blk_dev->priv = host_dev;
  93         blk_dev->blksz = 512;
  94         blk_dev->lba = os_lseek(host_dev->fd, 0, OS_SEEK_END) / blk_dev->blksz;
  95         blk_dev->block_read = host_block_read;
  96         blk_dev->block_write = host_block_write;
  97         blk_dev->devnum = dev;
  98         blk_dev->part_type = PART_TYPE_UNKNOWN;
  99         part_init(blk_dev);
 100
 101         return 0;
 102 }
 103
 104 int host_get_dev_err(int devnum, struct blk_desc **blk_devp)
 105 {
 106         struct host_block_dev *host_dev = find_host_device(devnum);
 107
 108         if (!host_dev)
 109                 return -ENODEV;
 110
 111         if (!host_dev->blk_dev.priv)
 112                 return -ENOENT;
 113
 114         *blk_devp = &host_dev->blk_dev;
 115         return 0;
 116 }
 117
 118 struct blk_desc *host_get_dev(int dev)
 119 {
 120         struct blk_desc *blk_dev;
 121
 122         if (host_get_dev_err(dev, &blk_dev))
 123                 return NULL;
 124
 125         return blk_dev;
 126 }