drivers/block/sandbox.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2013 Henrik Nordstrom <[email protected]>
   4  */
   5
   6 #include <blk.h>
   7 #include <dm.h>
   8 #include <fdtdec.h>
   9 #include <part.h>
  10 #include <os.h>
  11 #include <malloc.h>
  12 #include <sandbox_host.h>
  13 #include <asm/global_data.h>
  14 #include <dm/device_compat.h>
  15 #include <dm/device-internal.h>
  16 #include <linux/errno.h>
  17
  18 DECLARE_GLOBAL_DATA_PTR;
  19
  20 static unsigned long host_block_read(struct udevice *dev,
  21                                      unsigned long start, lbaint_t blkcnt,
  22                                      void *buffer)
  23 {
  24         struct blk_desc *desc = dev_get_uclass_plat(dev);
  25         struct udevice *host_dev = dev_get_parent(dev);
  26         struct host_sb_plat *plat = dev_get_plat(host_dev);
  27
  28         if (os_lseek(plat->fd, start * desc->blksz, OS_SEEK_SET) < 0) {
  29                 printf("ERROR: Invalid block %lx\n", start);
  30                 return -1;
  31         }
  32         ssize_t len = os_read(plat->fd, buffer, blkcnt * desc->blksz);
  33         if (len >= 0)
  34                 return len / desc->blksz;
  35
  36         return -EIO;
  37 }
  38
  39 static unsigned long host_block_write(struct udevice *dev,
  40                                       unsigned long start, lbaint_t blkcnt,
  41                                       const void *buffer)
  42 {
  43         struct blk_desc *desc = dev_get_uclass_plat(dev);
  44         struct udevice *host_dev = dev_get_parent(dev);
  45         struct host_sb_plat *plat = dev_get_plat(host_dev);
  46
  47         if (os_lseek(plat->fd, start * desc->blksz, OS_SEEK_SET) < 0) {
  48                 printf("ERROR: Invalid block %lx\n", start);
  49                 return -1;
  50         }
  51         ssize_t len = os_write(plat->fd, buffer, blkcnt * desc->blksz);
  52         if (len >= 0)
  53                 return len / desc->blksz;
  54
  55         return -EIO;
  56 }
  57
  58 static const struct blk_ops sandbox_host_blk_ops = {
  59         .read   = host_block_read,
  60         .write  = host_block_write,
  61 };
  62
  63 U_BOOT_DRIVER(sandbox_host_blk) = {
  64         .name           = "sandbox_host_blk",
  65         .id             = UCLASS_BLK,
  66         .ops            = &sandbox_host_blk_ops,
  67 };