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_efx_mtd_partition(mtd)				\
17	container_of(mtd, struct efx_mtd_partition, mtd)
18
19/* MTD interface */
20
21static int efx_mtd_erase(struct mtd_info *mtd, struct erase_info *erase)
22{
23	struct efx_nic *efx = mtd->priv;
24
25	return efx->type->mtd_erase(mtd, erase->addr, erase->len);
26}
27
28static void efx_mtd_sync(struct mtd_info *mtd)
29{
30	struct efx_mtd_partition *part = to_efx_mtd_partition(mtd);
31	struct efx_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 efx_siena_mtd_remove_partition(struct efx_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 efx_siena_mtd_add(struct efx_nic *efx, struct efx_mtd_partition *parts,
55		      size_t n_parts, size_t sizeof_part)
56{
57	struct efx_mtd_partition *part;
58	size_t i;
59
60	for (i = 0; i < n_parts; i++) {
61		part = (struct efx_mtd_partition *)((char *)parts +
62						    i * sizeof_part);
63
64		part->mtd.writesize = 1;
65
66		if (!(part->mtd.flags & MTD_NO_ERASE))
67			part->mtd.flags |= MTD_WRITEABLE;
68
69		part->mtd.owner = THIS_MODULE;
70		part->mtd.priv = efx;
71		part->mtd.name = part->name;
72		part->mtd._erase = efx_mtd_erase;
73		part->mtd._read = efx->type->mtd_read;
74		part->mtd._write = efx->type->mtd_write;
75		part->mtd._sync = efx_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 - efx_siena_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 efx_mtd_partition *)((char *)parts +
91						    i * sizeof_part);
92		efx_siena_mtd_remove_partition(part);
93	}
94	/* Failure is unlikely here, but probably means we're out of memory */
95	return -ENOMEM;
96}
97
98void efx_siena_mtd_remove(struct efx_nic *efx)
99{
100	struct efx_mtd_partition *parts, *part, *next;
101
102	WARN_ON(efx_dev_registered(efx));
103
104	if (list_empty(&efx->mtd_list))
105		return;
106
107	parts = list_first_entry(&efx->mtd_list, struct efx_mtd_partition,
108				 node);
109
110	list_for_each_entry_safe(part, next, &efx->mtd_list, node)
111		efx_siena_mtd_remove_partition(part);
112
113	kfree(parts);
114}
115
116void efx_siena_mtd_rename(struct efx_nic *efx)
117{
118	struct efx_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