| Lee Leahy | eef40eb | 2017-03-23 10:54:57 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2008, Freescale Semiconductor, Inc |
| 3 | * Andy Fleming |
| 4 | * |
| 5 | * Copyright 2013 Google Inc. All rights reserved. |
| 6 | * Copyright 2017 Intel Corporation |
| 7 | * |
| 8 | * MultiMediaCard (MMC), eMMC and Secure Digital (SD) erase support code. |
| 9 | * This code is controller independent. |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or |
| 12 | * modify it under the terms of the GNU General Public License as |
| 13 | * published by the Free Software Foundation; either version 2 of |
| 14 | * the License, or (at your option) any later version. |
| 15 | * |
| 16 | * This program is distributed in the hope that it will be useful, |
| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 19 | * GNU General Public License for more details. |
| 20 | */ |
| 21 | |
| Lee Leahy | eef40eb | 2017-03-23 10:54:57 -0700 | [diff] [blame] | 22 | #include "sd_mmc.h" |
| 23 | #include "storage.h" |
| 24 | |
| 25 | uint64_t storage_block_erase(struct storage_media *media, uint64_t start, |
| 26 | uint64_t count) |
| 27 | { |
| 28 | struct mmc_command cmd; |
| 29 | struct sd_mmc_ctrlr *ctrlr = media->ctrlr; |
| 30 | |
| 31 | if (storage_block_setup(media, start, count, 0) == 0) |
| 32 | return 0; |
| 33 | |
| 34 | cmd.cmdidx = MMC_CMD_ERASE_GROUP_START; |
| 35 | cmd.resp_type = CARD_RSP_R1; |
| 36 | cmd.cmdarg = start; |
| 37 | cmd.flags = 0; |
| 38 | |
| 39 | if (ctrlr->send_cmd(ctrlr, &cmd, NULL)) |
| 40 | return 0; |
| 41 | |
| 42 | cmd.cmdidx = MMC_CMD_ERASE_GROUP_END; |
| 43 | cmd.cmdarg = start + count - 1; |
| 44 | cmd.resp_type = CARD_RSP_R1; |
| 45 | cmd.flags = 0; |
| 46 | |
| 47 | if (ctrlr->send_cmd(ctrlr, &cmd, NULL)) |
| 48 | return 0; |
| 49 | |
| 50 | cmd.cmdidx = MMC_CMD_ERASE; |
| 51 | cmd.cmdarg = MMC_TRIM_ARG; /* just unmap blocks */ |
| 52 | cmd.resp_type = CARD_RSP_R1; |
| 53 | cmd.flags = 0; |
| 54 | |
| 55 | if (ctrlr->send_cmd(ctrlr, &cmd, NULL)) |
| 56 | return 0; |
| 57 | |
| 58 | size_t erase_blocks; |
| 59 | /* |
| 60 | * Timeout for TRIM operation on one erase group is defined as: |
| 61 | * TRIM timeout = 300ms x TRIM_MULT |
| 62 | * |
| 63 | * This timeout is expressed in units of 100us to sd_mmc_send_status. |
| 64 | * |
| 65 | * Hence, timeout_per_erase_block = TRIM timeout * 1000us/100us; |
| 66 | */ |
| 67 | size_t timeout_per_erase_block = (media->trim_mult * 300) * 10; |
| 68 | int err = 0; |
| 69 | |
| 70 | erase_blocks = ALIGN_UP(count, media->erase_blocks) |
| 71 | / media->erase_blocks; |
| 72 | |
| 73 | while (erase_blocks) { |
| 74 | /* |
| 75 | * To avoid overflow of timeout value, loop in calls to |
| 76 | * sd_mmc_send_status for erase_blocks number of times. |
| 77 | */ |
| 78 | err = sd_mmc_send_status(media, timeout_per_erase_block); |
| 79 | |
| 80 | /* Send status successful, erase action complete. */ |
| 81 | if (err == 0) |
| 82 | break; |
| 83 | |
| 84 | erase_blocks--; |
| 85 | } |
| 86 | |
| 87 | /* Total timeout done. Still status not successful. */ |
| 88 | if (err) { |
| 89 | sd_mmc_error("TRIM operation not successful within timeout.\n"); |
| 90 | return 0; |
| 91 | } |
| 92 | |
| 93 | return count; |
| 94 | } |