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  
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  }