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        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
  40static void ef4_mtd_sync(struct mtd_info *mtd)
  41{
  42        struct ef4_mtd_partition *part = to_ef4_mtd_partition(mtd);
  43        struct ef4_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
  52static void ef4_mtd_remove_partition(struct ef4_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
  66int ef4_mtd_add(struct ef4_nic *efx, struct ef4_mtd_partition *parts,
  67                size_t n_parts, size_t sizeof_part)
  68{
  69        struct ef4_mtd_partition *part;
  70        size_t i;
  71
  72        for (i = 0; i < n_parts; i++) {
  73                part = (struct ef4_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 = ef4_mtd_erase;
  82                part->mtd._read = efx->type->mtd_read;
  83                part->mtd._write = efx->type->mtd_write;
  84                part->mtd._sync = ef4_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 - ef4_mtd_remove() depends on this */
  92                list_add_tail(&part->node, &efx->mtd_list);
  93        }
  94
  95        return 0;
  96
  97fail:
  98        while (i--) {
  99                part = (struct ef4_mtd_partition *)((char *)parts +
 100                                                    i * sizeof_part);
 101                ef4_mtd_remove_partition(part);
 102        }
 103        /* Failure is unlikely here, but probably means we're out of memory */
 104        return -ENOMEM;
 105}
 106
 107void ef4_mtd_remove(struct ef4_nic *efx)
 108{
 109        struct ef4_mtd_partition *parts, *part, *next;
 110
 111        WARN_ON(ef4_dev_registered(efx));
 112
 113        if (list_empty(&efx->mtd_list))
 114                return;
 115
 116        parts = list_first_entry(&efx->mtd_list, struct ef4_mtd_partition,
 117                                 node);
 118
 119        list_for_each_entry_safe(part, next, &efx->mtd_list, node)
 120                ef4_mtd_remove_partition(part);
 121
 122        kfree(parts);
 123}
 124
 125void ef4_mtd_rename(struct ef4_nic *efx)
 126{
 127        struct ef4_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}
 134