LXR linux/drivers/net/ethernet/sfc/falcon/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_ef4_mtd_partition(mtd)                               \
  20        container_of(mtd, struct ef4_mtd_partition, mtd)
  21
  22/* MTD interface */
  23
  24static int ef4_mtd_erase(struct mtd_info *mtd, struct erase_info *erase)
  25{
  26        struct ef4_nic *efx = mtd->priv;
  27
  28        return efx->type->mtd_erase(mtd, erase->addr, erase->len);
  29}
  30
  31static void ef4_mtd_sync(struct mtd_info *mtd)
  32{
  33        struct ef4_mtd_partition *part = to_ef4_mtd_partition(mtd);
  34        struct ef4_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
  43static void ef4_mtd_remove_partition(struct ef4_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
  57int ef4_mtd_add(struct ef4_nic *efx, struct ef4_mtd_partition *parts,
  58                size_t n_parts, size_t sizeof_part)
  59{
  60        struct ef4_mtd_partition *part;
  61        size_t i;
  62
  63        for (i = 0; i < n_parts; i++) {
  64                part = (struct ef4_mtd_partition *)((char *)parts +
  65                                                    i * sizeof_part);
  66
  67                part->mtd.writesize = 1;
  68
  69                part->mtd.owner = THIS_MODULE;
  70                part->mtd.priv = efx;
  71                part->mtd.name = part->name;
  72                part->mtd._erase = ef4_mtd_erase;
  73                part->mtd._read = efx->type->mtd_read;
  74                part->mtd._write = efx->type->mtd_write;
  75                part->mtd._sync = ef4_mtd_sync;
  76
  77                efx->type->mtd_rename(part);
  78
  79                if (mtd_device_register(&part->mtd, NULL, 0))
  80                        goto fail;
  81
  82                /* Add to list in order - ef4_mtd_remove() depends on this */
  83                list_add_tail(&part->node, &efx->mtd_list);
  84        }
  85
  86        return 0;
  87
  88fail:
  89        while (i--) {
  90                part = (struct ef4_mtd_partition *)((char *)parts +
  91                                                    i * sizeof_part);
  92                ef4_mtd_remove_partition(part);
  93        }
  94        /* Failure is unlikely here, but probably means we're out of memory */
  95        return -ENOMEM;
  96}
  97
  98void ef4_mtd_remove(struct ef4_nic *efx)
  99{
 100        struct ef4_mtd_partition *parts, *part, *next;
 101
 102        WARN_ON(ef4_dev_registered(efx));
 103
 104        if (list_empty(&efx->mtd_list))
 105                return;
 106
 107        parts = list_first_entry(&efx->mtd_list, struct ef4_mtd_partition,
 108                                 node);
 109
 110        list_for_each_entry_safe(part, next, &efx->mtd_list, node)
 111                ef4_mtd_remove_partition(part);
 112
 113        kfree(parts);
 114}
 115
 116void ef4_mtd_rename(struct ef4_nic *efx)
 117{
 118        struct ef4_mtd_partition *part;
 119
 120        ASSERT_RTNL();
 121
 122        list_for_each_entry(part, &efx->mtd_list, node)
 123                efx->type->mtd_rename(part);
 124}
 125