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_ef4_mtd_partition(mtd) \ 17 container_of(mtd, struct ef4_mtd_partition, mtd) 18 19 /* MTD interface */ 20 21 static int ef4_mtd_erase(struct mtd_info *mtd, struct erase_info *erase) 22 { 23 struct ef4_nic *efx = mtd->priv; 24 25 return efx->type->mtd_erase(mtd, erase->addr, erase->len); 26 } 27 28 static void ef4_mtd_sync(struct mtd_info *mtd) 29 { 30 struct ef4_mtd_partition *part = to_ef4_mtd_partition(mtd); 31 struct ef4_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 ef4_mtd_remove_partition(struct ef4_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 ef4_mtd_add(struct ef4_nic *efx, struct ef4_mtd_partition *parts, 55 size_t n_parts, size_t sizeof_part) 56 { 57 struct ef4_mtd_partition *part; 58 size_t i; 59 60 for (i = 0; i < n_parts; i++) { 61 part = (struct ef4_mtd_partition *)((char *)parts + 62 i * sizeof_part); 63 64 part->mtd.writesize = 1; 65 66 part->mtd.owner = THIS_MODULE; 67 part->mtd.priv = efx; 68 part->mtd.name = part->name; 69 part->mtd._erase = ef4_mtd_erase; 70 part->mtd._read = efx->type->mtd_read; 71 part->mtd._write = efx->type->mtd_write; 72 part->mtd._sync = ef4_mtd_sync; 73 74 efx->type->mtd_rename(part); 75 76 if (mtd_device_register(&part->mtd, NULL, 0)) 77 goto fail; 78 79 /* Add to list in order - ef4_mtd_remove() depends on this */ 80 list_add_tail(&part->node, &efx->mtd_list); 81 } 82 83 return 0; 84 85 fail: 86 while (i--) { 87 part = (struct ef4_mtd_partition *)((char *)parts + 88 i * sizeof_part); 89 ef4_mtd_remove_partition(part); 90 } 91 /* Failure is unlikely here, but probably means we're out of memory */ 92 return -ENOMEM; 93 } 94 95 void ef4_mtd_remove(struct ef4_nic *efx) 96 { 97 struct ef4_mtd_partition *parts, *part, *next; 98 99 WARN_ON(ef4_dev_registered(efx)); 100 101 if (list_empty(&efx->mtd_list)) 102 return; 103 104 parts = list_first_entry(&efx->mtd_list, struct ef4_mtd_partition, 105 node); 106 107 list_for_each_entry_safe(part, next, &efx->mtd_list, node) 108 ef4_mtd_remove_partition(part); 109 110 kfree(parts); 111 } 112 113 void ef4_mtd_rename(struct ef4_nic *efx) 114 { 115 struct ef4_mtd_partition *part; 116 117 ASSERT_RTNL(); 118 119 list_for_each_entry(part, &efx->mtd_list, node) 120 efx->type->mtd_rename(part); 121 } 122