1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3 * MultiMediaCard (MMC), eMMC and Secure Digital (SD) erase support code.
4 * This code is controller independent.
5 */
6
7 #include "sd_mmc.h"
8 #include "storage.h"
9
storage_block_erase(struct storage_media * media,uint64_t start,uint64_t count)10 uint64_t storage_block_erase(struct storage_media *media, uint64_t start,
11 uint64_t count)
12 {
13 struct mmc_command cmd;
14 struct sd_mmc_ctrlr *ctrlr = media->ctrlr;
15
16 if (storage_block_setup(media, start, count, 0) == 0)
17 return 0;
18
19 cmd.cmdidx = MMC_CMD_ERASE_GROUP_START;
20 cmd.resp_type = CARD_RSP_R1;
21 cmd.cmdarg = start;
22 cmd.flags = 0;
23
24 if (ctrlr->send_cmd(ctrlr, &cmd, NULL))
25 return 0;
26
27 cmd.cmdidx = MMC_CMD_ERASE_GROUP_END;
28 cmd.cmdarg = start + count - 1;
29 cmd.resp_type = CARD_RSP_R1;
30 cmd.flags = 0;
31
32 if (ctrlr->send_cmd(ctrlr, &cmd, NULL))
33 return 0;
34
35 cmd.cmdidx = MMC_CMD_ERASE;
36 cmd.cmdarg = MMC_TRIM_ARG; /* just unmap blocks */
37 cmd.resp_type = CARD_RSP_R1;
38 cmd.flags = 0;
39
40 if (ctrlr->send_cmd(ctrlr, &cmd, NULL))
41 return 0;
42
43 size_t erase_blocks;
44 /*
45 * Timeout for TRIM operation on one erase group is defined as:
46 * TRIM timeout = 300ms x TRIM_MULT
47 *
48 * This timeout is expressed in units of 100us to sd_mmc_send_status.
49 *
50 * Hence, timeout_per_erase_block = TRIM timeout * 1000us/100us;
51 */
52 size_t timeout_per_erase_block = (media->trim_mult * 300) * 10;
53 int err = 0;
54
55 erase_blocks = ALIGN_UP(count, media->erase_blocks)
56 / media->erase_blocks;
57
58 while (erase_blocks) {
59 /*
60 * To avoid overflow of timeout value, loop in calls to
61 * sd_mmc_send_status for erase_blocks number of times.
62 */
63 err = sd_mmc_send_status(media, timeout_per_erase_block);
64
65 /* Send status successful, erase action complete. */
66 if (err == 0)
67 break;
68
69 erase_blocks--;
70 }
71
72 /* Total timeout done. Still status not successful. */
73 if (err) {
74 sd_mmc_error("TRIM operation not successful within timeout.\n");
75 return 0;
76 }
77
78 return count;
79 }
80