kernel/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         int rc;
  28
  29         rc = efx->type->mtd_erase(mtd, erase->addr, erase->len);
  30         if (rc == 0) {
  31                 erase->state = MTD_ERASE_DONE;
  32         } else {
  33                 erase->state = MTD_ERASE_FAILED;
  34                 erase->fail_addr = MTD_FAIL_ADDR_UNKNOWN;
  35         }
  36         mtd_erase_callback(erase);
  37         return rc;
  38 }
  39
  40 static void efx_mtd_sync(struct mtd_info *mtd)
  41 {
  42         struct efx_mtd_partition *part = to_efx_mtd_partition(mtd);
  43         struct efx_nic *efx = mtd->priv;
  44         int rc;
  45
  46         rc = efx->type->mtd_sync(mtd);
  47         if (rc)
  48                 pr_err("%s: %s sync failed (%d)\n",
  49                        part->name, part->dev_type_name, rc);
  50 }
  51
  52 static void efx_mtd_remove_partition(struct efx_mtd_partition *part)
  53 {
  54         int rc;
  55
  56         for (;;) {
  57                 rc = mtd_device_unregister(&part->mtd);
  58                 if (rc != -EBUSY)
  59                         break;
  60                 ssleep(1);
  61         }
  62         WARN_ON(rc);
  63         list_del(&part->node);
  64 }
  65
  66 int efx_mtd_add(struct efx_nic *efx, struct efx_mtd_partition *parts,
  67                 size_t n_parts, size_t sizeof_part)
  68 {
  69         struct efx_mtd_partition *part;
  70         size_t i;
  71
  72         for (i = 0; i < n_parts; i++) {
  73                 part = (struct efx_mtd_partition *)((char *)parts +
  74                                                     i * sizeof_part);
  75
  76                 part->mtd.writesize = 1;
  77
  78                 part->mtd.owner = THIS_MODULE;
  79                 part->mtd.priv = efx;
  80                 part->mtd.name = part->name;
  81                 part->mtd._erase = efx_mtd_erase;
  82                 part->mtd._read = efx->type->mtd_read;
  83                 part->mtd._write = efx->type->mtd_write;
  84                 part->mtd._sync = efx_mtd_sync;
  85
  86                 efx->type->mtd_rename(part);
  87
  88                 if (mtd_device_register(&part->mtd, NULL, 0))
  89                         goto fail;
  90
  91                 /* Add to list in order - efx_mtd_remove() depends on this */
  92                 list_add_tail(&part->node, &efx->mtd_list);
  93         }
  94
  95         return 0;
  96
  97 fail:
  98         while (i--) {
  99                 part = (struct efx_mtd_partition *)((char *)parts +
 100                                                     i * sizeof_part);
 101                 efx_mtd_remove_partition(part);
 102         }
 103         /* Failure is unlikely here, but probably means we're out of memory */
 104         return -ENOMEM;
 105 }
 106
 107 void efx_mtd_remove(struct efx_nic *efx)
 108 {
 109         struct efx_mtd_partition *parts, *part, *next;
 110
 111         WARN_ON(efx_dev_registered(efx));
 112
 113         if (list_empty(&efx->mtd_list))
 114                 return;
 115
 116         parts = list_first_entry(&efx->mtd_list, struct efx_mtd_partition,
 117                                  node);
 118
 119         list_for_each_entry_safe(part, next, &efx->mtd_list, node)
 120                 efx_mtd_remove_partition(part);
 121
 122         kfree(parts);
 123 }
 124
 125 void efx_mtd_rename(struct efx_nic *efx)
 126 {
 127         struct efx_mtd_partition *part;
 128
 129         ASSERT_RTNL();
 130
 131         list_for_each_entry(part, &efx->mtd_list, node)
 132                 efx->type->mtd_rename(part);
 133 }