xref: /openbmc/linux/drivers/net/ethernet/sfc/mtd.c (revision f052febd)
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 
21 static 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 
28 static 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 
40 static void efx_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 
54 int efx_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_mtd_remove() depends on this */
83 		list_add_tail(&part->node, &efx->mtd_list);
84 	}
85 
86 	return 0;
87 
88 fail:
89 	while (i--) {
90 		part = (struct efx_mtd_partition *)((char *)parts +
91 						    i * sizeof_part);
92 		efx_mtd_remove_partition(part);
93 	}
94 	/* Failure is unlikely here, but probably means we're out of memory */
95 	return -ENOMEM;
96 }
97 
98 void efx_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_mtd_remove_partition(part);
112 
113 	kfree(parts);
114 }
115 
116 void efx_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