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  • /*
     * Copyright (C) 2016 Google, Inc
     * Written by Amar <amarendra.xt@samsung.com>
     *
     * SPDX-License-Identifier:	GPL-2.0+
     */
    
    #include <common.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)
    {
    
    	return mmc_switch(mmc, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_PART_CONF,
    			  EXT_CSD_BOOT_ACK(ack) |
    			  EXT_CSD_BOOT_PART_NUM(part_num) |
    			  EXT_CSD_PARTITION_ACCESS(access));
    
    }
    
    /*
     * 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);
    }