drivers/mmc/mmc_boot.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2016 Google, Inc
 * Written by Amar <amarendra.xt@samsung.com>
 */

#include <log.h>
#include <mmc.h>
#include "mmc_private.h"

/*
 * This function changes the size of boot partition and the size of rpmb
 * partition present on EMMC devices.
 *
 * Input Parameters:
 * struct *mmc: pointer for the mmc device strcuture
 * bootsize: size of boot partition
 * rpmbsize: size of rpmb partition
 *
 * Returns 0 on success.
 */

int mmc_boot_partition_size_change(struct mmc *mmc, unsigned long bootsize,
				unsigned long rpmbsize)
{
	int err;
	struct mmc_cmd cmd;

	/* Only use this command for raw EMMC moviNAND. Enter backdoor mode */
	cmd.cmdidx = MMC_CMD_RES_MAN;
	cmd.resp_type = MMC_RSP_R1b;
	cmd.cmdarg = MMC_CMD62_ARG1;

	err = mmc_send_cmd(mmc, &cmd, NULL);
	if (err) {
		debug("mmc_boot_partition_size_change: Error1 = %d\n", err);
		return err;
	}

	/* Boot partition changing mode */
	cmd.cmdidx = MMC_CMD_RES_MAN;
	cmd.resp_type = MMC_RSP_R1b;
	cmd.cmdarg = MMC_CMD62_ARG2;

	err = mmc_send_cmd(mmc, &cmd, NULL);
	if (err) {
		debug("mmc_boot_partition_size_change: Error2 = %d\n", err);
		return err;
	}
	/* boot partition size is multiple of 128KB */
	bootsize = (bootsize * 1024) / 128;

	/* Arg: boot partition size */
	cmd.cmdidx = MMC_CMD_RES_MAN;
	cmd.resp_type = MMC_RSP_R1b;
	cmd.cmdarg = bootsize;

	err = mmc_send_cmd(mmc, &cmd, NULL);
	if (err) {
		debug("mmc_boot_partition_size_change: Error3 = %d\n", err);
		return err;
	}
	/* RPMB partition size is multiple of 128KB */
	rpmbsize = (rpmbsize * 1024) / 128;
	/* Arg: RPMB partition size */
	cmd.cmdidx = MMC_CMD_RES_MAN;
	cmd.resp_type = MMC_RSP_R1b;
	cmd.cmdarg = rpmbsize;

	err = mmc_send_cmd(mmc, &cmd, NULL);
	if (err) {
		debug("mmc_boot_partition_size_change: Error4 = %d\n", err);
		return err;
	}
	return 0;
}

/*
 * Modify EXT_CSD[177] which is BOOT_BUS_WIDTH
 * based on the passed in values for BOOT_BUS_WIDTH, RESET_BOOT_BUS_WIDTH
 * and BOOT_MODE.
 *
 * Returns 0 on success.
 */
int mmc_set_boot_bus_width(struct mmc *mmc, u8 width, u8 reset, u8 mode)
{
	return mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_BUS_WIDTH,
			  EXT_CSD_BOOT_BUS_WIDTH_MODE(mode) |
			  EXT_CSD_BOOT_BUS_WIDTH_RESET(reset) |
			  EXT_CSD_BOOT_BUS_WIDTH_WIDTH(width));
}

/*
 * Modify EXT_CSD[179] which is PARTITION_CONFIG (formerly BOOT_CONFIG)
 * based on the passed in values for BOOT_ACK, BOOT_PARTITION_ENABLE and
 * PARTITION_ACCESS.
 *
 * Returns 0 on success.
 */
int mmc_set_part_conf(struct mmc *mmc, u8 ack, u8 part_num, u8 access)
{
	int ret;
	u8 part_conf;

	part_conf = EXT_CSD_BOOT_ACK(ack) |
		    EXT_CSD_BOOT_PART_NUM(part_num) |
		    EXT_CSD_PARTITION_ACCESS(access);

	ret = mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONF,
			 part_conf);
	if (!ret)
		mmc->part_config = part_conf;

	return ret;
}

/*
 * Modify EXT_CSD[162] which is RST_n_FUNCTION based on the given value
 * for enable.  Note that this is a write-once field for non-zero values.
 *
 * Returns 0 on success.
 */
int mmc_set_rst_n_function(struct mmc *mmc, u8 enable)
{
	return mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_RST_N_FUNCTION,
			  enable);
}