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}