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_efx_mtd_partition(mtd)				\
20	container_of(mtd, struct efx_mtd_partition, mtd)
21
22/* MTD interface */
23
24static int efx_mtd_erase(struct mtd_info *mtd, struct erase_info *erase)
25{
26	struct efx_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 efx_mtd_sync(struct mtd_info *mtd)
41{
42	struct efx_mtd_partition *part = to_efx_mtd_partition(mtd);
43	struct efx_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 efx_mtd_remove_partition(struct efx_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 efx_mtd_add(struct efx_nic *efx, struct efx_mtd_partition *parts,
67		size_t n_parts, size_t sizeof_part)
68{
69	struct efx_mtd_partition *part;
70	size_t i;
71
72	for (i = 0; i < n_parts; i++) {
73		part = (struct efx_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 = efx_mtd_erase;
82		part->mtd._read = efx->type->mtd_read;
83		part->mtd._write = efx->type->mtd_write;
84		part->mtd._sync = efx_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 - efx_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 efx_mtd_partition *)((char *)parts +
100						    i * sizeof_part);
101		efx_mtd_remove_partition(part);
102	}
103	/* Failure is unlikely here, but probably means we're out of memory */
104	return -ENOMEM;
105}
106
107void efx_mtd_remove(struct efx_nic *efx)
108{
109	struct efx_mtd_partition *parts, *part, *next;
110
111	WARN_ON(efx_dev_registered(efx));
112
113	if (list_empty(&efx->mtd_list))
114		return;
115
116	parts = list_first_entry(&efx->mtd_list, struct efx_mtd_partition,
117				 node);
118
119	list_for_each_entry_safe(part, next, &efx->mtd_list, node)
120		efx_mtd_remove_partition(part);
121
122	kfree(parts);
123}
124
125void efx_mtd_rename(struct efx_nic *efx)
126{
127	struct efx_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