LXR linux/drivers/net/ethernet/sfc/falcon/mtd.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/****************************************************************************
   3 * Driver for Solarflare network controllers and boards
   4 * Copyright 2005-2006 Fen Systems Ltd.
   5 * Copyright 2006-2013 Solarflare Communications Inc.
   6 */
   7
   8#include <linux/module.h>
   9#include <linux/mtd/mtd.h>
  10#include <linux/slab.h>
  11#include <linux/rtnetlink.h>
  12
  13#include "net_driver.h"
  14#include "efx.h"
  15
  16#define to_ef4_mtd_partition(mtd)                               \
  17        container_of(mtd, struct ef4_mtd_partition, mtd)
  18
  19/* MTD interface */
  20
  21static int ef4_mtd_erase(struct mtd_info *mtd, struct erase_info *erase)
  22{
  23        struct ef4_nic *efx = mtd->priv;
  24
  25        return efx->type->mtd_erase(mtd, erase->addr, erase->len);
  26}
  27
  28static void ef4_mtd_sync(struct mtd_info *mtd)
  29{
  30        struct ef4_mtd_partition *part = to_ef4_mtd_partition(mtd);
  31        struct ef4_nic *efx = mtd->priv;
  32        int rc;
  33
  34        rc = efx->type->mtd_sync(mtd);
  35        if (rc)
  36                pr_err("%s: %s sync failed (%d)\n",
  37                       part->name, part->dev_type_name, rc);
  38}
  39
  40static void ef4_mtd_remove_partition(struct ef4_mtd_partition *part)
  41{
  42        int rc;
  43
  44        for (;;) {
  45                rc = mtd_device_unregister(&part->mtd);
  46                if (rc != -EBUSY)
  47                        break;
  48                ssleep(1);
  49        }
  50        WARN_ON(rc);
  51        list_del(&part->node);
  52}
  53
  54int ef4_mtd_add(struct ef4_nic *efx, struct ef4_mtd_partition *parts,
  55                size_t n_parts, size_t sizeof_part)
  56{
  57        struct ef4_mtd_partition *part;
  58        size_t i;
  59
  60        for (i = 0; i < n_parts; i++) {
  61                part = (struct ef4_mtd_partition *)((char *)parts +
  62                                                    i * sizeof_part);
  63
  64                part->mtd.writesize = 1;
  65
  66                part->mtd.owner = THIS_MODULE;
  67                part->mtd.priv = efx;
  68                part->mtd.name = part->name;
  69                part->mtd._erase = ef4_mtd_erase;
  70                part->mtd._read = efx->type->mtd_read;
  71                part->mtd._write = efx->type->mtd_write;
  72                part->mtd._sync = ef4_mtd_sync;
  73
  74                efx->type->mtd_rename(part);
  75
  76                if (mtd_device_register(&part->mtd, NULL, 0))
  77                        goto fail;
  78
  79                /* Add to list in order - ef4_mtd_remove() depends on this */
  80                list_add_tail(&part->node, &efx->mtd_list);
  81        }
  82
  83        return 0;
  84
  85fail:
  86        while (i--) {
  87                part = (struct ef4_mtd_partition *)((char *)parts +
  88                                                    i * sizeof_part);
  89                ef4_mtd_remove_partition(part);
  90        }
  91        /* Failure is unlikely here, but probably means we're out of memory */
  92        return -ENOMEM;
  93}
  94
  95void ef4_mtd_remove(struct ef4_nic *efx)
  96{
  97        struct ef4_mtd_partition *parts, *part, *next;
  98
  99        WARN_ON(ef4_dev_registered(efx));
 100
 101        if (list_empty(&efx->mtd_list))
 102                return;
 103
 104        parts = list_first_entry(&efx->mtd_list, struct ef4_mtd_partition,
 105                                 node);
 106
 107        list_for_each_entry_safe(part, next, &efx->mtd_list, node)
 108                ef4_mtd_remove_partition(part);
 109
 110        kfree(parts);
 111}
 112
 113void ef4_mtd_rename(struct ef4_nic *efx)
 114{
 115        struct ef4_mtd_partition *part;
 116
 117        ASSERT_RTNL();
 118
 119        list_for_each_entry(part, &efx->mtd_list, node)
 120                efx->type->mtd_rename(part);
 121}
 122