sfc/falcon/mtd.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /****************************************************************************
0003  * Driver for Solarflare network controllers and boards
0004  * Copyright 2005-2006 Fen Systems Ltd.
0005  * Copyright 2006-2013 Solarflare Communications Inc.
0006  */
0007
0008 #include <linux/module.h>
0009 #include <linux/mtd/mtd.h>
0010 #include <linux/slab.h>
0011 #include <linux/rtnetlink.h>
0012
0013 #include "net_driver.h"
0014 #include "efx.h"
0015
0016 #define to_ef4_mtd_partition(mtd)               \
0017     container_of(mtd, struct ef4_mtd_partition, mtd)
0018
0019 /* MTD interface */
0020
0021 static int ef4_mtd_erase(struct mtd_info *mtd, struct erase_info *erase)
0022 {
0023     struct ef4_nic *efx = mtd->priv;
0024
0025     return efx->type->mtd_erase(mtd, erase->addr, erase->len);
0026 }
0027
0028 static void ef4_mtd_sync(struct mtd_info *mtd)
0029 {
0030     struct ef4_mtd_partition *part = to_ef4_mtd_partition(mtd);
0031     struct ef4_nic *efx = mtd->priv;
0032     int rc;
0033
0034     rc = efx->type->mtd_sync(mtd);
0035     if (rc)
0036         pr_err("%s: %s sync failed (%d)\n",
0037                part->name, part->dev_type_name, rc);
0038 }
0039
0040 static void ef4_mtd_remove_partition(struct ef4_mtd_partition *part)
0041 {
0042     int rc;
0043
0044     for (;;) {
0045         rc = mtd_device_unregister(&part->mtd);
0046         if (rc != -EBUSY)
0047             break;
0048         ssleep(1);
0049     }
0050     WARN_ON(rc);
0051     list_del(&part->node);
0052 }
0053
0054 int ef4_mtd_add(struct ef4_nic *efx, struct ef4_mtd_partition *parts,
0055         size_t n_parts, size_t sizeof_part)
0056 {
0057     struct ef4_mtd_partition *part;
0058     size_t i;
0059
0060     for (i = 0; i < n_parts; i++) {
0061         part = (struct ef4_mtd_partition *)((char *)parts +
0062                             i * sizeof_part);
0063
0064         part->mtd.writesize = 1;
0065
0066         part->mtd.owner = THIS_MODULE;
0067         part->mtd.priv = efx;
0068         part->mtd.name = part->name;
0069         part->mtd._erase = ef4_mtd_erase;
0070         part->mtd._read = efx->type->mtd_read;
0071         part->mtd._write = efx->type->mtd_write;
0072         part->mtd._sync = ef4_mtd_sync;
0073
0074         efx->type->mtd_rename(part);
0075
0076         if (mtd_device_register(&part->mtd, NULL, 0))
0077             goto fail;
0078
0079         /* Add to list in order - ef4_mtd_remove() depends on this */
0080         list_add_tail(&part->node, &efx->mtd_list);
0081     }
0082
0083     return 0;
0084
0085 fail:
0086     while (i--) {
0087         part = (struct ef4_mtd_partition *)((char *)parts +
0088                             i * sizeof_part);
0089         ef4_mtd_remove_partition(part);
0090     }
0091     /* Failure is unlikely here, but probably means we're out of memory */
0092     return -ENOMEM;
0093 }
0094
0095 void ef4_mtd_remove(struct ef4_nic *efx)
0096 {
0097     struct ef4_mtd_partition *parts, *part, *next;
0098
0099     WARN_ON(ef4_dev_registered(efx));
0100
0101     if (list_empty(&efx->mtd_list))
0102         return;
0103
0104     parts = list_first_entry(&efx->mtd_list, struct ef4_mtd_partition,
0105                  node);
0106
0107     list_for_each_entry_safe(part, next, &efx->mtd_list, node)
0108         ef4_mtd_remove_partition(part);
0109
0110     kfree(parts);
0111 }
0112
0113 void ef4_mtd_rename(struct ef4_nic *efx)
0114 {
0115     struct ef4_mtd_partition *part;
0116
0117     ASSERT_RTNL();
0118
0119     list_for_each_entry(part, &efx->mtd_list, node)
0120         efx->type->mtd_rename(part);
0121 }