drivers/net/ethernet/sfc/mtd.c

   1 /****************************************************************************
   2  * Driver for Solarflare network controllers and boards
   3  * Copyright 2005-2006 Fen Systems Ltd.
   4  * Copyright 2006-2013 Solarflare Communications Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 as published
   8  * by the Free Software Foundation, incorporated herein by reference.
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/mtd/mtd.h>
  13 #include <linux/slab.h>
  14 #include <linux/rtnetlink.h>
  15
  16 #include "net_driver.h"
  17 #include "efx.h"
  18
  19 #define to_efx_mtd_partition(mtd)                               \
  20         container_of(mtd, struct efx_mtd_partition, mtd)
  21
  22 /* MTD interface */
  23
  24 static int efx_mtd_erase(struct mtd_info *mtd, struct erase_info *erase)
  25 {
  26         struct efx_nic *efx = mtd->priv;
  27
  28         return efx->type->mtd_erase(mtd, erase->addr, erase->len);
  29 }
  30
  31 static void efx_mtd_sync(struct mtd_info *mtd)
  32 {
  33         struct efx_mtd_partition *part = to_efx_mtd_partition(mtd);
  34         struct efx_nic *efx = mtd->priv;
  35         int rc;
  36
  37         rc = efx->type->mtd_sync(mtd);
  38         if (rc)
  39                 pr_err("%s: %s sync failed (%d)\n",
  40                        part->name, part->dev_type_name, rc);
  41 }
  42
  43 static void efx_mtd_remove_partition(struct efx_mtd_partition *part)
  44 {
  45         int rc;
  46
  47         for (;;) {
  48                 rc = mtd_device_unregister(&part->mtd);
  49                 if (rc != -EBUSY)
  50                         break;
  51                 ssleep(1);
  52         }
  53         WARN_ON(rc);
  54         list_del(&part->node);
  55 }
  56
  57 int efx_mtd_add(struct efx_nic *efx, struct efx_mtd_partition *parts,
  58                 size_t n_parts, size_t sizeof_part)
  59 {
  60         struct efx_mtd_partition *part;
  61         size_t i;
  62
  63         for (i = 0; i < n_parts; i++) {
  64                 part = (struct efx_mtd_partition *)((char *)parts +
  65                                                     i * sizeof_part);
  66
  67                 part->mtd.writesize = 1;
  68
  69                 if (!(part->mtd.flags & MTD_NO_ERASE))
  70                         part->mtd.flags |= MTD_WRITEABLE;
  71
  72                 part->mtd.owner = THIS_MODULE;
  73                 part->mtd.priv = efx;
  74                 part->mtd.name = part->name;
  75                 part->mtd._erase = efx_mtd_erase;
  76                 part->mtd._read = efx->type->mtd_read;
  77                 part->mtd._write = efx->type->mtd_write;
  78                 part->mtd._sync = efx_mtd_sync;
  79
  80                 efx->type->mtd_rename(part);
  81
  82                 if (mtd_device_register(&part->mtd, NULL, 0))
  83                         goto fail;
  84
  85                 /* Add to list in order - efx_mtd_remove() depends on this */
  86                 list_add_tail(&part->node, &efx->mtd_list);
  87         }
  88
  89         return 0;
  90
  91 fail:
  92         while (i--) {
  93                 part = (struct efx_mtd_partition *)((char *)parts +
  94                                                     i * sizeof_part);
  95                 efx_mtd_remove_partition(part);
  96         }
  97         /* Failure is unlikely here, but probably means we're out of memory */
  98         return -ENOMEM;
  99 }
 100
 101 void efx_mtd_remove(struct efx_nic *efx)
 102 {
 103         struct efx_mtd_partition *parts, *part, *next;
 104
 105         WARN_ON(efx_dev_registered(efx));
 106
 107         if (list_empty(&efx->mtd_list))
 108                 return;
 109
 110         parts = list_first_entry(&efx->mtd_list, struct efx_mtd_partition,
 111                                  node);
 112
 113         list_for_each_entry_safe(part, next, &efx->mtd_list, node)
 114                 efx_mtd_remove_partition(part);
 115
 116         kfree(parts);
 117 }
 118
 119 void efx_mtd_rename(struct efx_nic *efx)
 120 {
 121         struct efx_mtd_partition *part;
 122
 123         ASSERT_RTNL();
 124
 125         list_for_each_entry(part, &efx->mtd_list, node)
 126                 efx->type->mtd_rename(part);
 127 }