drivers/mmc/mmc_write.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright 2008, Freescale Semiconductor, Inc
 * Andy Fleming
 *
 * Based vaguely on the Linux code
 */

#include <config.h>
#include <common.h>
#include <dm.h>
#include <part.h>
#include <div64.h>
#include <linux/math64.h>
#include "mmc_private.h"


extern bool emmckey_is_access_range_legal(struct mmc *mmc,
		ulong start, lbaint_t blkcnt);

static ulong mmc_erase_t(struct mmc *mmc, ulong start, lbaint_t blkcnt)
{
	struct mmc_cmd cmd;
	ulong end;
	int err, start_cmd, end_cmd;

	if (mmc->high_capacity) {
		end = start + blkcnt - 1;
	} else {
		end = (start + blkcnt - 1) * mmc->write_bl_len;
		start *= mmc->write_bl_len;
	}

	if (IS_SD(mmc)) {
		start_cmd = SD_CMD_ERASE_WR_BLK_START;
		end_cmd = SD_CMD_ERASE_WR_BLK_END;
	} else {
		start_cmd = MMC_CMD_ERASE_GROUP_START;
		end_cmd = MMC_CMD_ERASE_GROUP_END;
	}
	cmd.cmdidx = start_cmd;
	cmd.cmdarg = start;
	cmd.resp_type = MMC_RSP_R1;

	err = mmc_send_cmd(mmc, &cmd, NULL);
	if (err)
		goto err_out;

	cmd.cmdidx = end_cmd;
	cmd.cmdarg = end;
	err = mmc_send_cmd(mmc, &cmd, NULL);
	if (err)
		goto err_out;

	cmd.cmdidx = MMC_CMD_ERASE;
	cmd.cmdarg = MMC_ERASE_ARG;
	cmd.resp_type = MMC_RSP_R1b;

	err = mmc_send_cmd(mmc, &cmd, NULL);
	if (err)
		goto err_out;

	return 0;

err_out:
	puts("mmc erase failed\n");
	return err;
}

#ifdef CONFIG_BLK
ulong mmc_berase(struct udevice *dev, lbaint_t start, lbaint_t blkcnt)
#else
ulong mmc_berase(struct blk_desc *block_dev, lbaint_t start, lbaint_t blkcnt)
#endif
{
#ifdef CONFIG_BLK
	struct blk_desc *block_dev = dev_get_uclass_platdata(dev);
#endif
	int dev_num = block_dev->devnum;
	int err = 0;
	u32 start_rem, blkcnt_rem;
	struct mmc *mmc = find_mmc_device(dev_num);
	lbaint_t blk = 0, blk_r = 0;
	int timeout = 1000;

	if (!mmc)
		return -1;

	if (!emmckey_is_access_range_legal(mmc, start, blkcnt))
		return blkcnt;

	err = blk_select_hwpart_devnum(IF_TYPE_MMC, dev_num,
				       block_dev->hwpart);
	if (err < 0)
		return -1;
	if (blkcnt == 0) {
		blkcnt = mmc->capacity/512 - (mmc->capacity/512)% mmc->erase_grp_size; // erase whole
		printf("blkcnt = %lu\n",blkcnt);
	}
	/*
	 * We want to see if the requested start or total block count are
	 * unaligned.  We discard the whole numbers and only care about the
	 * remainder.
	 */
	err = div_u64_rem(start, mmc->erase_grp_size, &start_rem);
	err = div_u64_rem(blkcnt, mmc->erase_grp_size, &blkcnt_rem);
	if (start_rem || blkcnt_rem)
		printf("\n\nCaution! Your devices Erase group is 0x%x\n"
		       "The erase range would be change to "
		       "0x" LBAF "~0x" LBAF "\n\n",
		       mmc->erase_grp_size, start & ~(mmc->erase_grp_size - 1),
		       ((start + blkcnt + mmc->erase_grp_size)
		       & ~(mmc->erase_grp_size - 1)) - 1);

	while (blk < blkcnt) {
		if (IS_SD(mmc) && mmc->ssr.au) {
			blk_r = ((blkcnt - blk) > mmc->ssr.au) ?
				mmc->ssr.au : (blkcnt - blk);
		} else {
			blk_r = ((blkcnt - blk) < mmc->erase_grp_size) ?
				mmc->erase_grp_size : (blkcnt - blk);
		}
		err = mmc_erase_t(mmc, start + blk, blk_r);
		if (err)
			return 1;

		blk += blk_r;

		/* Waiting for the ready status */
		if (mmc_send_status(mmc, timeout))
			return 1;
	}

	return 0;
}

static int mmc_set_blockcount(struct mmc *mmc, unsigned int blockcount)
{
	struct mmc_cmd cmd = { 0 };

	cmd.cmdidx = MMC_CMD_SET_BLOCK_COUNT;
	cmd.cmdarg = min(blockcount, (unsigned int)MMC_BLOCK_COUNT_MAX);
	cmd.cmdarg |= MMC_RELIABLE_WRITE_ARG;
	cmd.resp_type = MMC_RSP_R1;

	return mmc_send_cmd(mmc, &cmd, NULL);
}

static ulong mmc_write_blocks(struct mmc *mmc, lbaint_t start, lbaint_t blkcnt,
			      const void *src)
{
	struct mmc_cmd cmd;
	struct mmc_data data;
	int timeout = 1000;
	if ((start + blkcnt) > mmc_get_blk_desc(mmc)->lba) {
		printf("MMC: block number 0x" LBAF " exceeds max(0x" LBAF ")\n",
		       start + blkcnt, mmc_get_blk_desc(mmc)->lba);
		return 0;
	}

	if (mmc->ext_csd[EXT_CSD_DATA_SECTOR_SIZE] !=
	    EXT_CSD_DATA_SECTOR_SIZE_512) {
		printf("MMC: mmc is not operating in 512 bytes sector size.\n");
		return 0;
	}

	if (blkcnt == 0)
		return 0;

	// Set block count and activate reliable write.
	if (mmc_set_blockcount(mmc, blkcnt))
		return 0;

	cmd.cmdidx = MMC_CMD_WRITE_MULTIPLE_BLOCK;
	if (mmc->high_capacity)
		cmd.cmdarg = start;
	else
		cmd.cmdarg = start * mmc->write_bl_len;

	cmd.resp_type = MMC_RSP_R1;

	data.src = src;
	data.blocks = blkcnt;
	data.blocksize = mmc->write_bl_len;
	data.flags = MMC_DATA_WRITE;

	if (mmc_send_cmd(mmc, &cmd, &data)) {
		printf("mmc write failed\n");
		return 0;
	}

	// Pre-defined block count. No need for stop command.

	/* Waiting for the ready status */
	if (mmc_send_status(mmc, timeout))
		return 0;

	return blkcnt;
}

#ifdef CONFIG_BLK
ulong mmc_bwrite(struct udevice *dev, lbaint_t start, lbaint_t blkcnt,
		 const void *src)
#else
ulong mmc_bwrite(struct blk_desc *block_dev, lbaint_t start, lbaint_t blkcnt,
		 const void *src)
#endif
{
#ifdef CONFIG_BLK
	struct blk_desc *block_dev = dev_get_uclass_platdata(dev);
#endif
	int dev_num = block_dev->devnum;
	lbaint_t cur, blocks_todo = blkcnt;
	int err;

	struct mmc *mmc = find_mmc_device(dev_num);
	if (!mmc)
		return 0;

	err = blk_select_hwpart_devnum(IF_TYPE_MMC, dev_num, block_dev->hwpart);
	if (err < 0)
		return 0;

	if (mmc_set_blocklen(mmc, mmc->write_bl_len))
		return 0;

	if (!emmckey_is_access_range_legal(mmc, start, blkcnt))
		return 0;

	do {
		cur = min(blocks_todo, (lbaint_t)mmc->cfg->b_max);
		// Reliable write requires to set block count, which is only 2 bytes.
		// Thus limit the write size to no more than 0xffff blocks.
		cur = min((lbaint_t)MMC_BLOCK_COUNT_MAX, cur);
		if (mmc_write_blocks(mmc, start, cur, src) != cur)
			return 0;

		blocks_todo -= cur;
		start += cur;
		src += cur * mmc->write_bl_len;
	} while (blocks_todo > 0);
	return blkcnt;
}