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 <sandbox_host.h>
  14 #include <asm/global_data.h>
  15 #include <dm/device_compat.h>
  16 #include <dm/device-internal.h>
  17 #include <linux/errno.h>
  18
  19 DECLARE_GLOBAL_DATA_PTR;
  20
  21 static unsigned long host_block_read(struct udevice *dev,
  22                                      unsigned long start, lbaint_t blkcnt,
  23                                      void *buffer)
  24 {
  25         struct blk_desc *desc = dev_get_uclass_plat(dev);
  26         struct udevice *host_dev = dev_get_parent(dev);
  27         struct host_sb_plat *plat = dev_get_plat(host_dev);
  28
  29         if (os_lseek(plat->fd, start * desc->blksz, OS_SEEK_SET) == -1) {
  30                 printf("ERROR: Invalid block %lx\n", start);
  31                 return -1;
  32         }
  33         ssize_t len = os_read(plat->fd, buffer, blkcnt * desc->blksz);
  34         if (len >= 0)
  35                 return len / desc->blksz;
  36
  37         return -EIO;
  38 }
  39
  40 static unsigned long host_block_write(struct udevice *dev,
  41                                       unsigned long start, lbaint_t blkcnt,
  42                                       const void *buffer)
  43 {
  44         struct blk_desc *desc = dev_get_uclass_plat(dev);
  45         struct udevice *host_dev = dev_get_parent(dev);
  46         struct host_sb_plat *plat = dev_get_plat(host_dev);
  47
  48         if (os_lseek(plat->fd, start * desc->blksz, OS_SEEK_SET) == -1) {
  49                 printf("ERROR: Invalid block %lx\n", start);
  50                 return -1;
  51         }
  52         ssize_t len = os_write(plat->fd, buffer, blkcnt * desc->blksz);
  53         if (len >= 0)
  54                 return len / desc->blksz;
  55
  56         return -EIO;
  57 }
  58
  59 static const struct blk_ops sandbox_host_blk_ops = {
  60         .read   = host_block_read,
  61         .write  = host_block_write,
  62 };
  63
  64 U_BOOT_DRIVER(sandbox_host_blk) = {
  65         .name           = "sandbox_host_blk",
  66         .id             = UCLASS_BLK,
  67         .ops            = &sandbox_host_blk_ops,
  68 };