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/*
* Copyright 2008, Freescale Semiconductor, Inc
* Andy Fleming
*
* Copyright 2013 Google Inc. All rights reserved.
* Copyright 2017 Intel Corporation
*
* MultiMediaCard (MMC), eMMC and Secure Digital (SD) erase support code.
* This code is controller independent.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include "sd_mmc.h"
#include "storage.h"
uint64_t storage_block_erase(struct storage_media *media, uint64_t start,
uint64_t count)
{
struct mmc_command cmd;
struct sd_mmc_ctrlr *ctrlr = media->ctrlr;
if (storage_block_setup(media, start, count, 0) == 0)
return 0;
cmd.cmdidx = MMC_CMD_ERASE_GROUP_START;
cmd.resp_type = CARD_RSP_R1;
cmd.cmdarg = start;
cmd.flags = 0;
if (ctrlr->send_cmd(ctrlr, &cmd, NULL))
return 0;
cmd.cmdidx = MMC_CMD_ERASE_GROUP_END;
cmd.cmdarg = start + count - 1;
cmd.resp_type = CARD_RSP_R1;
cmd.flags = 0;
if (ctrlr->send_cmd(ctrlr, &cmd, NULL))
return 0;
cmd.cmdidx = MMC_CMD_ERASE;
cmd.cmdarg = MMC_TRIM_ARG; /* just unmap blocks */
cmd.resp_type = CARD_RSP_R1;
cmd.flags = 0;
if (ctrlr->send_cmd(ctrlr, &cmd, NULL))
return 0;
size_t erase_blocks;
/*
* Timeout for TRIM operation on one erase group is defined as:
* TRIM timeout = 300ms x TRIM_MULT
*
* This timeout is expressed in units of 100us to sd_mmc_send_status.
*
* Hence, timeout_per_erase_block = TRIM timeout * 1000us/100us;
*/
size_t timeout_per_erase_block = (media->trim_mult * 300) * 10;
int err = 0;
erase_blocks = ALIGN_UP(count, media->erase_blocks)
/ media->erase_blocks;
while (erase_blocks) {
/*
* To avoid overflow of timeout value, loop in calls to
* sd_mmc_send_status for erase_blocks number of times.
*/
err = sd_mmc_send_status(media, timeout_per_erase_block);
/* Send status successful, erase action complete. */
if (err == 0)
break;
erase_blocks--;
}
/* Total timeout done. Still status not successful. */
if (err) {
sd_mmc_error("TRIM operation not successful within timeout.\n");
return 0;
}
return count;
}
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