path: root/src/flash/mflash.c

/***************************************************************************
 *   Copyright (C) 2007-2008 by unsik Kim <donari75@gmail.com>             *
 *                                                                         *
 *   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.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program.  If not, see <http://www.gnu.org/licenses/>. *
 ***************************************************************************/

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "mflash.h"
#include <target/target.h>
#include <helper/time_support.h>
#include <helper/fileio.h>
#include <helper/log.h>

static int s3c2440_set_gpio_to_output(struct mflash_gpio_num gpio);
static int s3c2440_set_gpio_output_val(struct mflash_gpio_num gpio, uint8_t val);
static int pxa270_set_gpio_to_output(struct mflash_gpio_num gpio);
static int pxa270_set_gpio_output_val(struct mflash_gpio_num gpio, uint8_t val);

static struct mflash_bank *mflash_bank;

static struct mflash_gpio_drv pxa270_gpio = {
	.name = "pxa270",
	.set_gpio_to_output = pxa270_set_gpio_to_output,
	.set_gpio_output_val = pxa270_set_gpio_output_val
};

static struct mflash_gpio_drv s3c2440_gpio = {
	.name = "s3c2440",
	.set_gpio_to_output = s3c2440_set_gpio_to_output,
	.set_gpio_output_val = s3c2440_set_gpio_output_val
};

static struct mflash_gpio_drv *mflash_gpio[] = {
	&pxa270_gpio,
	&s3c2440_gpio,
	NULL
};

#define PXA270_GAFR0_L 0x40E00054
#define PXA270_GAFR3_U 0x40E00070
#define PXA270_GAFR3_U_RESERVED_BITS  0xfffc0000u
#define PXA270_GPDR0 0x40E0000C
#define PXA270_GPDR3 0x40E0010C
#define PXA270_GPDR3_RESERVED_BITS  0xfe000000u
#define PXA270_GPSR0 0x40E00018
#define PXA270_GPCR0 0x40E00024

static int pxa270_set_gpio_to_output(struct mflash_gpio_num gpio)
{
	uint32_t addr, value, mask;
	struct target *target = mflash_bank->target;
	int ret;

	/* remove alternate function. */
	mask = 0x3u << (gpio.num & 0xF)*2;

	addr = PXA270_GAFR0_L + (gpio.num >> 4) * 4;

	ret = target_read_u32(target, addr, &value);
	if (ret != ERROR_OK)
		return ret;

	value &= ~mask;
	if (addr == PXA270_GAFR3_U)
		value &= ~PXA270_GAFR3_U_RESERVED_BITS;

	ret = target_write_u32(target, addr, value);
	if (ret != ERROR_OK)
		return ret;

	/* set direction to output */
	mask = 0x1u << (gpio.num & 0x1F);

	addr = PXA270_GPDR0 + (gpio.num >> 5) * 4;

	ret = target_read_u32(target, addr, &value);
	if (ret != ERROR_OK)
		return ret;

	value |= mask;
	if (addr == PXA270_GPDR3)
		value &= ~PXA270_GPDR3_RESERVED_BITS;

	ret = target_write_u32(target, addr, value);
	return ret;
}

static int pxa270_set_gpio_output_val(struct mflash_gpio_num gpio, uint8_t val)
{
	uint32_t addr, value, mask;
	struct target *target = mflash_bank->target;
	int ret;

	mask = 0x1u << (gpio.num & 0x1F);

	if (val)
		addr = PXA270_GPSR0 + (gpio.num >> 5) * 4;
	else
		addr = PXA270_GPCR0 + (gpio.num >> 5) * 4;

	ret = target_read_u32(target, addr, &value);
	if (ret != ERROR_OK)
		return ret;

	value |= mask;

	ret = target_write_u32(target, addr, value);

	return ret;
}

#define S3C2440_GPACON 0x56000000
#define S3C2440_GPADAT 0x56000004
#define S3C2440_GPJCON 0x560000d0
#define S3C2440_GPJDAT 0x560000d4

static int s3c2440_set_gpio_to_output(struct mflash_gpio_num gpio)
{
	uint32_t data, mask, gpio_con;
	struct target *target = mflash_bank->target;
	int ret;

	if (gpio.port[0] >= 'a' && gpio.port[0] <= 'h')
		gpio_con = S3C2440_GPACON + (gpio.port[0] - 'a') * 0x10;
	else if (gpio.port[0] == 'j')
		gpio_con = S3C2440_GPJCON;
	else {
		LOG_ERROR("mflash: invalid port %d%s", gpio.num, gpio.port);
		return ERROR_COMMAND_SYNTAX_ERROR;
	}

	ret = target_read_u32(target, gpio_con, &data);

	if (ret == ERROR_OK) {
		if (gpio.port[0] == 'a') {
			mask = 1 << gpio.num;
			data &= ~mask;
		} else {
			mask = 3 << gpio.num * 2;
			data &= ~mask;
			data |= (1 << gpio.num * 2);
		}

		ret = target_write_u32(target, gpio_con, data);
	}
	return ret;
}

static int s3c2440_set_gpio_output_val(struct mflash_gpio_num gpio, uint8_t val)
{
	uint32_t data, mask, gpio_dat;
	struct target *target = mflash_bank->target;
	int ret;

	if (gpio.port[0] >= 'a' && gpio.port[0] <= 'h')
		gpio_dat = S3C2440_GPADAT + (gpio.port[0] - 'a') * 0x10;
	else if (gpio.port[0] == 'j')
		gpio_dat = S3C2440_GPJDAT;
	else {
		LOG_ERROR("mflash: invalid port %d%s", gpio.num, gpio.port);
		return ERROR_COMMAND_SYNTAX_ERROR;
	}

	ret = target_read_u32(target, gpio_dat, &data);

	if (ret == ERROR_OK) {
		mask = 1 << gpio.num;
		if (val)
			data |= mask;
		else
			data &= ~mask;

		ret = target_write_u32(target, gpio_dat, data);
	}
	return ret;
}

static int mg_hdrst(uint8_t level)
{
	return mflash_bank->gpio_drv->set_gpio_output_val(mflash_bank->rst_pin, level);
}

static int mg_init_gpio(void)
{
	int ret;
	struct mflash_gpio_drv *gpio_drv = mflash_bank->gpio_drv;

	ret = gpio_drv->set_gpio_to_output(mflash_bank->rst_pin);
	if (ret != ERROR_OK)
		return ret;

	ret = gpio_drv->set_gpio_output_val(mflash_bank->rst_pin, 1);

	return ret;
}

static int mg_dsk_wait(mg_io_type_wait wait_local, uint32_t time_var)
{
	uint8_t status, error;
	struct target *target = mflash_bank->target;
	uint32_t mg_task_reg = mflash_bank->base + MG_REG_OFFSET;
	int ret;
	long long t = 0;

	struct duration bench;
	duration_start(&bench);

	while (time_var) {

		ret = target_read_u8(target, mg_task_reg + MG_REG_STATUS, &status);
		if (ret != ERROR_OK)
			return ret;

		if (status & mg_io_rbit_status_busy) {
			if (wait_local == mg_io_wait_bsy)
				return ERROR_OK;
		} else {
			switch (wait_local) {
				case mg_io_wait_not_bsy:
					return ERROR_OK;
				case mg_io_wait_rdy_noerr:
					if (status & mg_io_rbit_status_ready)
						return ERROR_OK;
					break;
				case mg_io_wait_drq_noerr:
					if (status & mg_io_rbit_status_data_req)
						return ERROR_OK;
					break;
				default:
					break;
			}

			/* Now we check the error condition! */
			if (status & mg_io_rbit_status_error) {
				ret = target_read_u8(target, mg_task_reg + MG_REG_ERROR, &error);
				if (ret != ERROR_OK)
					return ret;

				LOG_ERROR("mflash: io error 0x%02x", error);

				return ERROR_MG_IO;
			}

			switch (wait_local) {
				case mg_io_wait_rdy:
					if (status & mg_io_rbit_status_ready)
						return ERROR_OK;

				case mg_io_wait_drq:
					if (status & mg_io_rbit_status_data_req)
						return ERROR_OK;

				default:
					break;
			}
		}

		ret = duration_measure(&bench);
		if (ERROR_OK == ret)
			t = duration_elapsed(&bench) * 1000.0;
		else
			LOG_ERROR("mflash: duration measurement failed: %d", ret);

		if (t > time_var)
			break;
	}

	LOG_ERROR("mflash: timeout occured");
	return ERROR_MG_TIMEOUT;
}

static int mg_dsk_srst(uint8_t on)
{
	struct target *target = mflash_bank->target;
	uint32_t mg_task_reg = mflash_bank->base + MG_REG_OFFSET;
	uint8_t value;
	int ret;

	ret = target_read_u8(target, mg_task_reg + MG_REG_DRV_CTRL, &value);
	if (ret != ERROR_OK)
		return ret;

	if (on)
		value |= (mg_io_rbit_devc_srst);
	else
		value &= ~mg_io_rbit_devc_srst;

	ret = target_write_u8(target, mg_task_reg + MG_REG_DRV_CTRL, value);
	return ret;
}

static int mg_dsk_io_cmd(uint32_t sect_num, uint32_t cnt, uint8_t cmd)
{
	struct target *target = mflash_bank->target;
	uint32_t mg_task_reg = mflash_bank->base + MG_REG_OFFSET;
	uint8_t value;
	int ret;

	ret = mg_dsk_wait(mg_io_wait_rdy_noerr, MG_OEM_DISK_WAIT_TIME_NORMAL);
	if (ret != ERROR_OK)
		return ret;

	value = mg_io_rval_dev_drv_master | mg_io_rval_dev_lba_mode | ((sect_num >> 24) & 0xf);

	ret = target_write_u8(target, mg_task_reg + MG_REG_DRV_HEAD, value);
	ret |= target_write_u8(target, mg_task_reg + MG_REG_SECT_CNT, (uint8_t)cnt);
	ret |= target_write_u8(target, mg_task_reg + MG_REG_SECT_NUM, (uint8_t)sect_num);
	ret |= target_write_u8(target, mg_task_reg + MG_REG_CYL_LOW, (uint8_t)(sect_num >> 8));
	ret |= target_write_u8(target, mg_task_reg + MG_REG_CYL_HIGH, (uint8_t)(sect_num >> 16));

	if (ret != ERROR_OK)
		return ret;

	return target_write_u8(target, mg_task_reg + MG_REG_COMMAND, cmd);
}

static int mg_dsk_drv_info(void)
{
	struct target *target = mflash_bank->target;
	uint32_t mg_buff = mflash_bank->base + MG_BUFFER_OFFSET;
	int ret;

	ret = mg_dsk_io_cmd(0, 1, mg_io_cmd_identify);
	if (ret != ERROR_OK)
		return ret;

	ret = mg_dsk_wait(mg_io_wait_drq, MG_OEM_DISK_WAIT_TIME_NORMAL);
	if (ret != ERROR_OK)
		return ret;

	LOG_INFO("mflash: read drive info");

	if (!mflash_bank->drv_info)
		mflash_bank->drv_info = malloc(sizeof(struct mg_drv_info));

	ret = target_read_memory(target, mg_buff, 2,
			sizeof(mg_io_type_drv_info) >> 1,
			(uint8_t *)&mflash_bank->drv_info->drv_id);
	if (ret != ERROR_OK)
		return ret;

	mflash_bank->drv_info->tot_sects =
		(uint32_t)(mflash_bank->drv_info->drv_id.total_user_addressable_sectors_hi << 16)
		+ mflash_bank->drv_info->drv_id.total_user_addressable_sectors_lo;

	return target_write_u8(target,
		mflash_bank->base + MG_REG_OFFSET + MG_REG_COMMAND,
		mg_io_cmd_confirm_read);
}

static int mg_mflash_rst(void)
{
	int ret;

	ret = mg_init_gpio();
	if (ret != ERROR_OK)
		return ret;

	ret = mg_hdrst(0);
	if (ret != ERROR_OK)
		return ret;

	ret = mg_dsk_wait(mg_io_wait_bsy, MG_OEM_DISK_WAIT_TIME_LONG);
	if (ret != ERROR_OK)
		return ret;

	ret = mg_hdrst(1);
	if (ret != ERROR_OK)
		return ret;

	ret = mg_dsk_wait(mg_io_wait_not_bsy, MG_OEM_DISK_WAIT_TIME_LONG);
	if (ret != ERROR_OK)
		return ret;

	ret = mg_dsk_srst(1);
	if (ret != ERROR_OK)
		return ret;

	ret = mg_dsk_wait(mg_io_wait_bsy, MG_OEM_DISK_WAIT_TIME_LONG);
	if (ret != ERROR_OK)
		return ret;

	ret = mg_dsk_srst(0);
	if (ret != ERROR_OK)
		return ret;

	ret = mg_dsk_wait(mg_io_wait_not_bsy, MG_OEM_DISK_WAIT_TIME_LONG);
	if (ret != ERROR_OK)
		return ret;

	LOG_INFO("mflash: reset ok");

	return ERROR_OK;
}

static int mg_mflash_probe(void)
{
	int ret = mg_mflash_rst();
	if (ret != ERROR_OK)
		return ret;

	return mg_dsk_drv_info();
}

COMMAND_HANDLER(mg_probe_cmd)
{
	int ret;

	ret = mg_mflash_probe();

	if (ret == ERROR_OK) {
		command_print(CMD_CTX,
			"mflash (total %" PRIu32 " sectors) found at 0x%8.8" PRIx32 "",
			mflash_bank->drv_info->tot_sects,
			mflash_bank->base);
	}

	return ret;
}

static int mg_mflash_do_read_sects(void *buff, uint32_t sect_num, uint32_t sect_cnt)
{
	uint32_t i, address;
	int ret;
	struct target *target = mflash_bank->target;
	uint8_t *buff_ptr = buff;

	ret = mg_dsk_io_cmd(sect_num, sect_cnt, mg_io_cmd_read);
	if (ret != ERROR_OK)
		return ret;

	address = mflash_bank->base + MG_BUFFER_OFFSET;

	struct duration bench;
	duration_start(&bench);

	for (i = 0; i < sect_cnt; i++) {
		ret = mg_dsk_wait(mg_io_wait_drq, MG_OEM_DISK_WAIT_TIME_NORMAL);
		if (ret != ERROR_OK)
			return ret;

		ret = target_read_memory(target, address, 2, MG_MFLASH_SECTOR_SIZE / 2, buff_ptr);
		if (ret != ERROR_OK)
			return ret;

		buff_ptr += MG_MFLASH_SECTOR_SIZE;

		ret = target_write_u8(target,
				mflash_bank->base + MG_REG_OFFSET + MG_REG_COMMAND,
				mg_io_cmd_confirm_read);
		if (ret != ERROR_OK)
			return ret;

		LOG_DEBUG("mflash: %" PRIu32 " (0x%8.8" PRIx32 ") sector read", sect_num + i,
			(sect_num + i) * MG_MFLASH_SECTOR_SIZE);

		ret = duration_measure(&bench);
		if ((ERROR_OK == ret) && (duration_elapsed(&bench) > 3)) {
			LOG_INFO("mflash: read %" PRIu32 "'th sectors", sect_num + i);
			duration_start(&bench);
		}
	}

	return mg_dsk_wait(mg_io_wait_rdy, MG_OEM_DISK_WAIT_TIME_NORMAL);
}

static int mg_mflash_read_sects(void *buff, uint32_t sect_num, uint32_t sect_cnt)
{
	uint32_t quotient, residue, i;
	uint8_t *buff_ptr = buff;
	int ret = ERROR_OK;

	quotient = sect_cnt >> 8;
	residue = sect_cnt % 256;

	for (i = 0; i < quotient; i++) {
		LOG_DEBUG("mflash: sect num : %" PRIu32 " buff : %p",
			sect_num, buff_ptr);
		ret = mg_mflash_do_read_sects(buff_ptr, sect_num, 256);
		if (ret != ERROR_OK)
			return ret;

		sect_num += 256;
		buff_ptr += 256 * MG_MFLASH_SECTOR_SIZE;
	}

	if (residue) {
		LOG_DEBUG("mflash: sect num : %" PRIx32 " buff : %p",
			sect_num, buff_ptr);
		return mg_mflash_do_read_sects(buff_ptr, sect_num, residue);
	}

	return ret;
}

static int mg_mflash_do_write_sects(void *buff, uint32_t sect_num, uint32_t sect_cnt,
	uint8_t cmd)
{
	uint32_t i, address;
	int ret;
	struct target *target = mflash_bank->target;
	uint8_t *buff_ptr = buff;

	ret = mg_dsk_io_cmd(sect_num, sect_cnt, cmd);
	if (ret != ERROR_OK)
		return ret;

	address = mflash_bank->base + MG_BUFFER_OFFSET;

	struct duration bench;
	duration_start(&bench);

	for (i = 0; i < sect_cnt; i++) {
		ret = mg_dsk_wait(mg_io_wait_drq, MG_OEM_DISK_WAIT_TIME_NORMAL);
		if (ret != ERROR_OK)
			return ret;

		ret = target_write_memory(target, address, 2, MG_MFLASH_SECTOR_SIZE / 2, buff_ptr);
		if (ret != ERROR_OK)
			return ret;

		buff_ptr += MG_MFLASH_SECTOR_SIZE;

		ret = target_write_u8(target,
				mflash_bank->base + MG_REG_OFFSET + MG_REG_COMMAND,
				mg_io_cmd_confirm_write);
		if (ret != ERROR_OK)
			return ret;

		LOG_DEBUG("mflash: %" PRIu32 " (0x%8.8" PRIx32 ") sector write", sect_num + i,
			(sect_num + i) * MG_MFLASH_SECTOR_SIZE);

		ret = duration_measure(&bench);
		if ((ERROR_OK == ret) && (duration_elapsed(&bench) > 3)) {
			LOG_INFO("mflash: wrote %" PRIu32 "'th sectors", sect_num + i);
			duration_start(&bench);
		}
	}

	if (cmd == mg_io_cmd_write)
		ret = mg_dsk_wait(mg_io_wait_rdy, MG_OEM_DISK_WAIT_TIME_NORMAL);
	else
		ret = mg_dsk_wait(mg_io_wait_rdy, MG_OEM_DISK_WAIT_TIME_LONG);

	return ret;
}

static int mg_mflash_write_sects(void *buff, uint32_t sect_num, uint32_t sect_cnt)
{
	uint32_t quotient, residue, i;
	uint8_t *buff_ptr = buff;
	int ret = ERROR_OK;

	quotient = sect_cnt >> 8;
	residue = sect_cnt % 256;

	for (i = 0; i < quotient; i++) {
		LOG_DEBUG("mflash: sect num : %" PRIu32 "buff : %p", sect_num,
			buff_ptr);
		ret = mg_mflash_do_write_sects(buff_ptr, sect_num, 256, mg_io_cmd_write);
		if (ret != ERROR_OK)
			return ret;

		sect_num += 256;
		buff_ptr += 256 * MG_MFLASH_SECTOR_SIZE;
	}

	if (residue) {
		LOG_DEBUG("mflash: sect num : %" PRIu32 " buff : %p", sect_num,
			buff_ptr);
		return mg_mflash_do_write_sects(buff_ptr, sect_num, residue, mg_io_cmd_write);
	}

	return ret;
}

static int mg_mflash_read(uint32_t addr, uint8_t *buff, uint32_t len)
{
	uint8_t *buff_ptr = buff;
	uint8_t sect_buff[MG_MFLASH_SECTOR_SIZE];
	uint32_t cur_addr, next_sec_addr, end_addr, cnt, sect_num;
	int ret = ERROR_OK;

	cnt = 0;
	cur_addr = addr;
	end_addr = addr + len;

	if (cur_addr & MG_MFLASH_SECTOR_SIZE_MASK) {

		next_sec_addr = (cur_addr + MG_MFLASH_SECTOR_SIZE) & ~MG_MFLASH_SECTOR_SIZE_MASK;
		sect_num = cur_addr >> MG_MFLASH_SECTOR_SIZE_SHIFT;
		ret = mg_mflash_read_sects(sect_buff, sect_num, 1);
		if (ret != ERROR_OK)
			return ret;

		if (end_addr < next_sec_addr) {
			memcpy(buff_ptr,
				sect_buff + (cur_addr & MG_MFLASH_SECTOR_SIZE_MASK),
				end_addr - cur_addr);
			LOG_DEBUG(
				"mflash: copies %" PRIu32 " byte from sector offset 0x%8.8" PRIx32 "",
				end_addr - cur_addr,
				cur_addr);
			cur_addr = end_addr;
		} else {
			memcpy(buff_ptr,
				sect_buff + (cur_addr & MG_MFLASH_SECTOR_SIZE_MASK),
				next_sec_addr - cur_addr);
			LOG_DEBUG(
				"mflash: copies %" PRIu32 " byte from sector offset 0x%8.8" PRIx32 "",
				next_sec_addr - cur_addr,
				cur_addr);
			buff_ptr += (next_sec_addr - cur_addr);
			cur_addr = next_sec_addr;
		}
	}

	if (cur_addr < end_addr) {

		sect_num = cur_addr >> MG_MFLASH_SECTOR_SIZE_SHIFT;
		next_sec_addr = cur_addr + MG_MFLASH_SECTOR_SIZE;

		while (next_sec_addr <= end_addr) {
			cnt++;
			next_sec_addr += MG_MFLASH_SECTOR_SIZE;
		}

		if (cnt) {
			ret = mg_mflash_read_sects(buff_ptr, sect_num, cnt);
			if (ret != ERROR_OK)
				return ret;
		}

		buff_ptr += cnt * MG_MFLASH_SECTOR_SIZE;
		cur_addr += cnt * MG_MFLASH_SECTOR_SIZE;

		if (cur_addr < end_addr) {

			sect_num = cur_addr >> MG_MFLASH_SECTOR_SIZE_SHIFT;
			ret = mg_mflash_read_sects(sect_buff, sect_num, 1);
			if (ret != ERROR_OK)
				return ret;

			memcpy(buff_ptr, sect_buff, end_addr - cur_addr);
			LOG_DEBUG("mflash: copies %u byte", (unsigned)(end_addr - cur_addr));
		}
	}

	return ret;
}

static int mg_mflash_write(uint32_t addr, uint8_t *buff, uint32_t len)
{
	uint8_t *buff_ptr = buff;
	uint8_t sect_buff[MG_MFLASH_SECTOR_SIZE];
	uint32_t cur_addr, next_sec_addr, end_addr, cnt, sect_num;
	int ret = ERROR_OK;

	cnt = 0;
	cur_addr = addr;
	end_addr = addr + len;

	if (cur_addr & MG_MFLASH_SECTOR_SIZE_MASK) {

		next_sec_addr = (cur_addr + MG_MFLASH_SECTOR_SIZE) & ~MG_MFLASH_SECTOR_SIZE_MASK;
		sect_num = cur_addr >> MG_MFLASH_SECTOR_SIZE_SHIFT;
		ret = mg_mflash_read_sects(sect_buff, sect_num, 1);
		if (ret != ERROR_OK)
			return ret;

		if (end_addr < next_sec_addr) {
			memcpy(sect_buff + (cur_addr & MG_MFLASH_SECTOR_SIZE_MASK),
				buff_ptr,
				end_addr - cur_addr);
			LOG_DEBUG(
				"mflash: copies %" PRIu32 " byte to sector offset 0x%8.8" PRIx32 "",
				end_addr - cur_addr,
				cur_addr);
			cur_addr = end_addr;
		} else {
			memcpy(sect_buff + (cur_addr & MG_MFLASH_SECTOR_SIZE_MASK),
				buff_ptr,
				next_sec_addr - cur_addr);
			LOG_DEBUG(
				"mflash: copies %" PRIu32 " byte to sector offset 0x%8.8" PRIx32 "",
				next_sec_addr - cur_addr,
				cur_addr);
			buff_ptr += (next_sec_addr - cur_addr);
			cur_addr = next_sec_addr;
		}

		ret = mg_mflash_write_sects(sect_buff, sect_num, 1);
		if (ret != ERROR_OK)
			return ret;
	}

	if (cur_addr < end_addr) {

		sect_num = cur_addr >> MG_MFLASH_SECTOR_SIZE_SHIFT;
		next_sec_addr = cur_addr + MG_MFLASH_SECTOR_SIZE;

		while (next_sec_addr <= end_addr) {
			cnt++;
			next_sec_addr += MG_MFLASH_SECTOR_SIZE;
		}

		if (cnt) {
			ret = mg_mflash_write_sects(buff_ptr, sect_num, cnt);
			if (ret != ERROR_OK)
				return ret;
		}

		buff_ptr += cnt * MG_MFLASH_SECTOR_SIZE;
		cur_addr += cnt * MG_MFLASH_SECTOR_SIZE;

		if (cur_addr < end_addr) {

			sect_num = cur_addr >> MG_MFLASH_SECTOR_SIZE_SHIFT;
			ret = mg_mflash_read_sects(sect_buff, sect_num, 1);
			if (ret != ERROR_OK)
				return ret;

			memcpy(sect_buff, buff_ptr, end_addr - cur_addr);
			LOG_DEBUG("mflash: copies %" PRIu32 " byte", end_addr - cur_addr);
			ret = mg_mflash_write_sects(sect_buff, sect_num, 1);
		}
	}

	return ret;
}

COMMAND_HANDLER(mg_write_cmd)
{
	uint32_t address, cnt, res, i;
	uint8_t *buffer;
	struct fileio *fileio;
	int ret;

	if (CMD_ARGC != 3)
		return ERROR_COMMAND_SYNTAX_ERROR;

	COMMAND_PARSE_NUMBER(u32, CMD_ARGV[2], address);

	ret = fileio_open(&fileio, CMD_ARGV[1], FILEIO_READ, FILEIO_BINARY);
	if (ret != ERROR_OK)
		return ret;

	size_t filesize;
	buffer = malloc(MG_FILEIO_CHUNK);
	if (!buffer) {
		fileio_close(fileio);
		return ERROR_FAIL;
	}
	int retval = fileio_size(fileio, &filesize);
	if (retval != ERROR_OK) {
		fileio_close(fileio);
		free(buffer);
		return retval;
	}

	cnt = filesize / MG_FILEIO_CHUNK;
	res = filesize % MG_FILEIO_CHUNK;

	struct duration bench;
	duration_start(&bench);

	size_t buf_cnt;
	for (i = 0; i < cnt; i++) {
		ret = fileio_read(fileio, MG_FILEIO_CHUNK, buffer, &buf_cnt);
		if (ret != ERROR_OK)
			goto mg_write_cmd_err;
		ret = mg_mflash_write(address, buffer, MG_FILEIO_CHUNK);
		if (ret != ERROR_OK)
			goto mg_write_cmd_err;
		address += MG_FILEIO_CHUNK;
	}

	if (res) {
		ret = fileio_read(fileio, res, buffer, &buf_cnt);
		if (ret != ERROR_OK)
			goto mg_write_cmd_err;
		ret = mg_mflash_write(address, buffer, res);
		if (ret != ERROR_OK)
			goto mg_write_cmd_err;
	}

	if (duration_measure(&bench) == ERROR_OK) {
		command_print(CMD_CTX, "wrote %zu bytes from file %s "
			"in %fs (%0.3f kB/s)", filesize, CMD_ARGV[1],
			duration_elapsed(&bench), duration_kbps(&bench, filesize));
	}

	free(buffer);
	fileio_close(fileio);

	return ERROR_OK;

mg_write_cmd_err:
	free(buffer);
	fileio_close(fileio);

	return ret;
}

COMMAND_HANDLER(mg_dump_cmd)
{
	uint32_t address, size, cnt, res, i;
	uint8_t *buffer;
	struct fileio *fileio;
	int ret;

	if (CMD_ARGC != 4)
		return ERROR_COMMAND_SYNTAX_ERROR;

	COMMAND_PARSE_NUMBER(u32, CMD_ARGV[2], address);
	COMMAND_PARSE_NUMBER(u32, CMD_ARGV[3], size);

	ret = fileio_open(&fileio, CMD_ARGV[1], FILEIO_WRITE, FILEIO_BINARY);
	if (ret != ERROR_OK)
		return ret;

	buffer = malloc(MG_FILEIO_CHUNK);
	if (!buffer) {
		fileio_close(fileio);
		return ERROR_FAIL;
	}

	cnt = size / MG_FILEIO_CHUNK;
	res = size % MG_FILEIO_CHUNK;

	struct duration bench;
	duration_start(&bench);

	size_t size_written;
	for (i = 0; i < cnt; i++) {
		ret = mg_mflash_read(address, buffer, MG_FILEIO_CHUNK);
		if (ret != ERROR_OK)
			goto mg_dump_cmd_err;
		ret = fileio_write(fileio, MG_FILEIO_CHUNK, buffer, &size_written);
		if (ret != ERROR_OK)
			goto mg_dump_cmd_err;
		address += MG_FILEIO_CHUNK;
	}

	if (res) {
		ret = mg_mflash_read(address, buffer, res);
		if (ret != ERROR_OK)
			goto mg_dump_cmd_err;
		ret = fileio_write(fileio, res, buffer, &size_written);
		if (ret != ERROR_OK)
			goto mg_dump_cmd_err;
	}

	if (duration_measure(&bench) == ERROR_OK) {
		command_print(CMD_CTX, "dump image (address 0x%8.8" PRIx32 " "
			"size %" PRIu32 ") to file %s in %fs (%0.3f kB/s)",
			address, size, CMD_ARGV[1],
			duration_elapsed(&bench), duration_kbps(&bench, size));
	}

	free(buffer);
	fileio_close(fileio);

	return ERROR_OK;

mg_dump_cmd_err:
	free(buffer);
	fileio_close(fileio);

	return ret;
}

static int mg_set_feature(mg_feature_id feature, mg_feature_val config)
{
	struct target *target = mflash_bank->target;
	uint32_t mg_task_reg = mflash_bank->base + MG_REG_OFFSET;
	int ret;

	ret = mg_dsk_wait(mg_io_wait_rdy_noerr, MG_OEM_DISK_WAIT_TIME_NORMAL);
	if (ret != ERROR_OK)
		return ret;

	ret = target_write_u8(target, mg_task_reg + MG_REG_FEATURE, feature);
	ret |= target_write_u8(target, mg_task_reg + MG_REG_SECT_CNT, config);
	ret |= target_write_u8(target, mg_task_reg + MG_REG_COMMAND,
			mg_io_cmd_set_feature);

	return ret;
}

static int mg_is_valid_pll(double XIN, int N, double CLK_OUT, int NO)
{
	double v1 = XIN / N;
	double v2 = CLK_OUT * NO;

	if (v1 < 1000000 || v1 > 15000000 || v2 < 100000000 || v2 > 500000000)
		return ERROR_MG_INVALID_PLL;

	return ERROR_OK;
}

static int mg_pll_get_M(unsigned short feedback_div)
{
	int i, M;

	for (i = 1, M = 0; i < 512; i <<= 1, feedback_div >>= 1)
		M += (feedback_div & 1) * i;

	return M + 2;
}

static int mg_pll_get_N(unsigned char input_div)
{
	int i, N;

	for (i = 1, N = 0; i < 32; i <<= 1, input_div >>= 1)
		N += (input_div & 1) * i;

	return N + 2;
}

static int mg_pll_get_NO(unsigned char output_div)
{
	int i, NO;

	for (i = 0, NO = 1; i < 2; ++i, output_div >>= 1)
		if (output_div & 1)
			NO = NO << 1;

	return NO;
}

static double mg_do_calc_pll(double XIN, mg_pll_t *p_pll_val, int is_approximate)
{
	unsigned short i;
	unsigned char j, k;
	int M, N, NO;
	double CLK_OUT;
	double DIV = 1;
	double ROUND = 0;

	if (is_approximate) {
		DIV   = 1000000;
		ROUND = 500000;
	}

	for (i = 0; i < MG_PLL_MAX_FEEDBACKDIV_VAL; ++i) {
		M  = mg_pll_get_M(i);

		for (j = 0; j < MG_PLL_MAX_INPUTDIV_VAL; ++j) {
			N  = mg_pll_get_N(j);

			for (k = 0; k < MG_PLL_MAX_OUTPUTDIV_VAL; ++k) {
				NO = mg_pll_get_NO(k);

				CLK_OUT = XIN * ((double)M / N) / NO;

				if ((int)((CLK_OUT + ROUND) / DIV)
				    == (int)(MG_PLL_CLK_OUT / DIV)) {
					if (mg_is_valid_pll(XIN, N, CLK_OUT, NO) == ERROR_OK) {
						p_pll_val->lock_cyc =
							(int)(XIN * MG_PLL_STD_LOCKCYCLE /
							      MG_PLL_STD_INPUTCLK);
						p_pll_val->feedback_div = i;
						p_pll_val->input_div = j;
						p_pll_val->output_div = k;

						return CLK_OUT;
					}
				}
			}
		}
	}

	return 0;
}

static double mg_calc_pll(double XIN, mg_pll_t *p_pll_val)
{
	double CLK_OUT;

	CLK_OUT = mg_do_calc_pll(XIN, p_pll_val, 0);

	if (!CLK_OUT)
		return mg_do_calc_pll(XIN, p_pll_val, 1);
	else
		return CLK_OUT;
}

static int mg_verify_interface(void)
{
	uint16_t buff[MG_MFLASH_SECTOR_SIZE >> 1];
	uint16_t i, j;
	uint32_t address = mflash_bank->base + MG_BUFFER_OFFSET;
	struct target *target = mflash_bank->target;
	int ret;

	for (j = 0; j < 10; j++) {
		for (i = 0; i < MG_MFLASH_SECTOR_SIZE >> 1; i++)
			buff[i] = i;

		ret = target_write_memory(target, address, 2,
				MG_MFLASH_SECTOR_SIZE / 2, (uint8_t *)buff);
		if (ret != ERROR_OK)
			return ret;

		memset(buff, 0xff, MG_MFLASH_SECTOR_SIZE);

		ret = target_read_memory(target, address, 2,
				MG_MFLASH_SECTOR_SIZE / 2, (uint8_t *)buff);
		if (ret != ERROR_OK)
			return ret;

		for (i = 0; i < MG_MFLASH_SECTOR_SIZE >> 1; i++) {
			if (buff[i] != i) {
				LOG_ERROR("mflash: verify interface fail");
				return ERROR_MG_INTERFACE;
			}
		}
	}

	LOG_INFO("mflash: verify interface ok");
	return ret;
}

static const char g_strSEG_SerialNum[20] = {
	'G', 'm', 'n', 'i', '-', 'e', 'e', 'S', 'g', 'a', 'e', 'l',
	0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20
};

static const char g_strSEG_FWRev[8] = {
	'F', 'X', 'L', 'T', '2', 'v', '0', '.'
};

static const char g_strSEG_ModelNum[40] = {
	'F', 'X', 'A', 'L', 'H', 'S', '2', 0x20, '0', '0', 's', '7',
	0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
	0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
	0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20
};

static void mg_gen_ataid(mg_io_type_drv_info *pSegIdDrvInfo)
{
	/* b15 is ATA device(0)	, b7 is Removable Media Device */
	pSegIdDrvInfo->general_configuration            = 0x045A;
	/* 128MB :   Cylinder=> 977 , Heads=> 8 ,  Sectors=> 32
	 * 256MB :   Cylinder=> 980 , Heads=> 16 , Sectors=> 32
	 * 384MB :   Cylinder=> 745 , Heads=> 16 , Sectors=> 63
	 */
	pSegIdDrvInfo->number_of_cylinders              = 0x02E9;
	pSegIdDrvInfo->reserved1                        = 0x0;
	pSegIdDrvInfo->number_of_heads                  = 0x10;
	pSegIdDrvInfo->unformatted_bytes_per_track      = 0x0;
	pSegIdDrvInfo->unformatted_bytes_per_sector     = 0x0;
	pSegIdDrvInfo->sectors_per_track                = 0x3F;
	pSegIdDrvInfo->vendor_unique1[0]                = 0x000B;
	pSegIdDrvInfo->vendor_unique1[1]                = 0x7570;
	pSegIdDrvInfo->vendor_unique1[2]                = 0x8888;

	memcpy(pSegIdDrvInfo->serial_number, g_strSEG_SerialNum, 20);
	/* 0x2 : dual buffer */
	pSegIdDrvInfo->buffer_type                      = 0x2;
	/* buffer size : 2KB */
	pSegIdDrvInfo->buffer_sector_size               = 0x800;
	pSegIdDrvInfo->number_of_ecc_bytes              = 0;

	memcpy(pSegIdDrvInfo->firmware_revision, g_strSEG_FWRev, 8);

	memcpy(pSegIdDrvInfo->model_number, g_strSEG_ModelNum, 40);

	pSegIdDrvInfo->maximum_block_transfer           = 0x4;
	pSegIdDrvInfo->vendor_unique2                   = 0x0;
	pSegIdDrvInfo->dword_io                         = 0x00;
	/* b11 : IORDY support(PIO Mode 4), b10 : Disable/Enbale IORDY
	 * b9  : LBA support, b8 : DMA mode support
	 */
	pSegIdDrvInfo->capabilities                     = 0x1 << 9;

	pSegIdDrvInfo->reserved2                        = 0x4000;
	pSegIdDrvInfo->vendor_unique3                   = 0x00;
	/* PIOMode-2 support */
	pSegIdDrvInfo->pio_cycle_timing_mode            = 0x02;
	pSegIdDrvInfo->vendor_unique4                   = 0x00;
	/* MultiWord-2 support */
	pSegIdDrvInfo->dma_cycle_timing_mode            = 0x00;
	/* b1 : word64~70 is valid
	 * b0 : word54~58 are valid and reflect the current numofcyls,heads,sectors
	 * b2 : If device supports Ultra DMA , set to one to vaildate word88
	 */
	pSegIdDrvInfo->translation_fields_valid         = (0x1 << 1) | (0x1 << 0);
	pSegIdDrvInfo->number_of_current_cylinders      = 0x02E9;
	pSegIdDrvInfo->number_of_current_heads          = 0x10;
	pSegIdDrvInfo->current_sectors_per_track        = 0x3F;
	pSegIdDrvInfo->current_sector_capacity_lo       = 0x7570;
	pSegIdDrvInfo->current_sector_capacity_hi       = 0x000B;

	pSegIdDrvInfo->multi_sector_count                       = 0x04;
	/* b8 : Multiple secotr setting valid , b[7:0] num of secotrs per block */
	pSegIdDrvInfo->multi_sector_setting_valid               = 0x01;
	pSegIdDrvInfo->total_user_addressable_sectors_lo        = 0x7570;
	pSegIdDrvInfo->total_user_addressable_sectors_hi        = 0x000B;
	pSegIdDrvInfo->single_dma_modes_supported               = 0x00;
	pSegIdDrvInfo->single_dma_transfer_active               = 0x00;
	/* b2 :Multi-word DMA mode 2, b1 : Multi-word DMA mode 1 */
	pSegIdDrvInfo->multi_dma_modes_supported                = (0x1 << 0);
	/* b2 :Multi-word DMA mode 2, b1 : Multi-word DMA mode 1 */
	pSegIdDrvInfo->multi_dma_transfer_active                = (0x1 << 0);
	/* b0 : PIO Mode-3 support, b1 : PIO Mode-4 support */
	pSegIdDrvInfo->adv_pio_mode                             = 0x00;
	/* 480(0x1E0)nsec for Multi-word DMA mode0
	 * 150(0x96) nsec for Multi-word DMA mode1
	 * 120(0x78) nsec for Multi-word DMA mode2
	 */
	pSegIdDrvInfo->min_dma_cyc                      = 0x1E0;
	pSegIdDrvInfo->recommend_dma_cyc                = 0x1E0;
	pSegIdDrvInfo->min_pio_cyc_no_iordy             = 0x1E0;
	pSegIdDrvInfo->min_pio_cyc_with_iordy           = 0x1E0;
	memset(pSegIdDrvInfo->reserved3, 0x00, 22);
	/* b7 : ATA/ATAPI-7 ,b6 : ATA/ATAPI-6 ,b5 : ATA/ATAPI-5,b4 : ATA/ATAPI-4 */
	pSegIdDrvInfo->major_ver_num                    = 0x7E;
	/* 0x1C : ATA/ATAPI-6 T13 1532D revision1 */
	pSegIdDrvInfo->minor_ver_num                    = 0x19;
	/* NOP/READ BUFFER/WRITE BUFFER/Power management feature set support */
	pSegIdDrvInfo->feature_cmd_set_suprt0           = 0x7068;
	/* Features/command set is valid/Advanced Pwr management/CFA feature set
	 * not support
	 */
	pSegIdDrvInfo->feature_cmd_set_suprt1           = 0x400C;
	pSegIdDrvInfo->feature_cmd_set_suprt2           = 0x4000;
	/* READ/WRITE BUFFER/PWR Management enable */
	pSegIdDrvInfo->feature_cmd_set_en0              = 0x7000;
	/* CFA feature is disabled / Advancde power management disable */
	pSegIdDrvInfo->feature_cmd_set_en1              = 0x0;
	pSegIdDrvInfo->feature_cmd_set_en2              = 0x4000;
	pSegIdDrvInfo->reserved4                        = 0x0;
	/* 0x1 * 2minutes */
	pSegIdDrvInfo->req_time_for_security_er_done    = 0x19;
	pSegIdDrvInfo->req_time_for_enhan_security_er_done      = 0x19;
	/* Advanced power management level 1 */
	pSegIdDrvInfo->adv_pwr_mgm_lvl_val                      = 0x0;
	pSegIdDrvInfo->reserved5                        = 0x0;
	memset(pSegIdDrvInfo->reserved6, 0x00, 68);
	/* Security mode feature is disabled */
	pSegIdDrvInfo->security_stas                    = 0x0;
	memset(pSegIdDrvInfo->vendor_uniq_bytes, 0x00, 62);
	/* CFA power mode 1 support in maximum 200mA */
	pSegIdDrvInfo->cfa_pwr_mode                     = 0x0100;
	memset(pSegIdDrvInfo->reserved7, 0x00, 190);
}

static int mg_storage_config(void)
{
	uint8_t buff[512];
	int ret;

	ret = mg_set_feature(mg_feature_id_transmode, mg_feature_val_trans_vcmd);
	if (ret != ERROR_OK)
		return ret;

	mg_gen_ataid((mg_io_type_drv_info *)(void *)buff);

	ret = mg_mflash_do_write_sects(buff, 0, 1, mg_vcmd_update_stgdrvinfo);
	if (ret != ERROR_OK)
		return ret;

	ret = mg_set_feature(mg_feature_id_transmode, mg_feature_val_trans_default);
	if (ret != ERROR_OK)
		return ret;

	LOG_INFO("mflash: storage config ok");
	return ret;
}

static int mg_boot_config(void)
{
	uint8_t buff[512];
	int ret;

	ret = mg_set_feature(mg_feature_id_transmode, mg_feature_val_trans_vcmd);
	if (ret != ERROR_OK)
		return ret;

	memset(buff, 0xff, 512);

	buff[0] = mg_op_mode_snd;		/* operation mode */
	buff[1] = MG_UNLOCK_OTP_AREA;
	buff[2] = 4;				/* boot size */
	*((uint32_t *)(void *)(buff + 4)) = 0;		/* XIP size */

	ret = mg_mflash_do_write_sects(buff, 0, 1, mg_vcmd_update_xipinfo);
	if (ret != ERROR_OK)
		return ret;

	ret = mg_set_feature(mg_feature_id_transmode, mg_feature_val_trans_default);
	if (ret != ERROR_OK)
		return ret;

	LOG_INFO("mflash: boot config ok");
	return ret;
}

static int mg_set_pll(mg_pll_t *pll)
{
	uint8_t buff[512];
	int ret;

	memset(buff, 0xff, 512);
	/* PLL Lock cycle and Feedback 9bit Divider */
	memcpy(buff, &pll->lock_cyc, sizeof(uint32_t));
	memcpy(buff + 4, &pll->feedback_div, sizeof(uint16_t));
	buff[6] = pll->input_div;		/* PLL Input 5bit Divider */
	buff[7] = pll->output_div;		/* PLL Output Divider */

	ret = mg_set_feature(mg_feature_id_transmode, mg_feature_val_trans_vcmd);
	if (ret != ERROR_OK)
		return ret;

	ret = mg_mflash_do_write_sects(buff, 0, 1, mg_vcmd_wr_pll);
	if (ret != ERROR_OK)
		return ret;

	ret = mg_set_feature(mg_feature_id_transmode, mg_feature_val_trans_default);
	if (ret != ERROR_OK)
		return ret;

	LOG_INFO("mflash: set pll ok");
	return ret;
}

static int mg_erase_nand(void)
{
	int ret;

	ret = mg_set_feature(mg_feature_id_transmode, mg_feature_val_trans_vcmd);
	if (ret != ERROR_OK)
		return ret;

	ret = mg_mflash_do_write_sects(NULL, 0, 0, mg_vcmd_purge_nand);
	if (ret != ERROR_OK)
		return ret;

	ret = mg_set_feature(mg_feature_id_transmode, mg_feature_val_trans_default);
	if (ret != ERROR_OK)
		return ret;

	LOG_INFO("mflash: erase nand ok");
	return ret;
}

COMMAND_HANDLER(mg_config_cmd)
{
	double fin, fout;
	mg_pll_t pll;
	int ret;

	ret = mg_verify_interface();
	if (ret != ERROR_OK)
		return ret;

	ret = mg_mflash_rst();
	if (ret != ERROR_OK)
		return ret;

	switch (CMD_ARGC) {
		case 2:
			if (!strcmp(CMD_ARGV[1], "boot"))
				return mg_boot_config();
			else if (!strcmp(CMD_ARGV[1], "storage"))
				return mg_storage_config();
			else
				return ERROR_COMMAND_NOTFOUND;
			break;
		case 3:
			if (!strcmp(CMD_ARGV[1], "pll")) {
				unsigned long freq;
				COMMAND_PARSE_NUMBER(ulong, CMD_ARGV[2], freq);
				fin = freq;

				if (fin > MG_PLL_CLK_OUT) {
					LOG_ERROR("mflash: input freq. is too large");
					return ERROR_MG_INVALID_OSC;
				}

				fout = mg_calc_pll(fin, &pll);

				if (!fout) {
					LOG_ERROR("mflash: cannot generate valid pll");
					return ERROR_MG_INVALID_PLL;
				}

				LOG_INFO("mflash: Fout=%" PRIu32 " Hz, feedback=%u,"
						"indiv=%u, outdiv=%u, lock=%u",
						(uint32_t)fout, pll.feedback_div,
						pll.input_div, pll.output_div,
						pll.lock_cyc);

				ret = mg_erase_nand();
				if (ret != ERROR_OK)
					return ret;

				return mg_set_pll(&pll);
			} else
				return ERROR_COMMAND_NOTFOUND;
			break;
		default:
			return ERROR_COMMAND_SYNTAX_ERROR;
	}
}

static const struct command_registration mflash_exec_command_handlers[] = {
	{
		.name = "probe",
		.handler = mg_probe_cmd,
		.mode = COMMAND_EXEC,
		.help = "Detect bank configuration information",
	},
	{
		.name = "write",
		.handler = mg_write_cmd,
		.mode = COMMAND_EXEC,
		/* FIXME bank_num is unused */
		.usage = "bank_num filename address",
		.help = "Write binary file at the specified address.",
	},
	{
		.name = "dump",
		.handler = mg_dump_cmd,
		.mode = COMMAND_EXEC,
		/* FIXME bank_num is unused */
		.usage = "bank_num filename address size",
		.help = "Write specified number of bytes from a binary file "
			"to the specified, address.",
	},
	{
		.name = "config",
		.handler = mg_config_cmd,
		.mode = COMMAND_EXEC,
		.help = "Configure MFLASH options.",
		.usage = "('boot'|'storage'|'pll' frequency)",
	},
	COMMAND_REGISTRATION_DONE
};

static int mflash_init_drivers(struct command_context *cmd_ctx)
{
	if (!mflash_bank)
		return ERROR_OK;
	return register_commands(cmd_ctx, NULL, mflash_exec_command_handlers);
}

COMMAND_HANDLER(handle_mflash_init_command)
{
	if (CMD_ARGC != 0)
		return ERROR_COMMAND_SYNTAX_ERROR;

	static bool mflash_initialized;
	if (mflash_initialized) {
		LOG_INFO("'mflash init' has already been called");
		return ERROR_OK;
	}
	mflash_initialized = true;

	LOG_DEBUG("Initializing mflash devices...");
	return mflash_init_drivers(CMD_CTX);
}

COMMAND_HANDLER(mg_bank_cmd)
{
	struct target *target;
	int i;

	if (CMD_ARGC < 4)
		return ERROR_COMMAND_SYNTAX_ERROR;

	target = get_target(CMD_ARGV[3]);
	if (target == NULL) {
		LOG_ERROR("target '%s' not defined", CMD_ARGV[3]);
		return ERROR_FAIL;
	}

	mflash_bank = calloc(sizeof(struct mflash_bank), 1);
	COMMAND_PARSE_NUMBER(u32, CMD_ARGV[1], mflash_bank->base);
	/** @todo Verify how this parsing should work, then document it. */
	char *str;
	mflash_bank->rst_pin.num = strtoul(CMD_ARGV[2], &str, 0);
	if (*str)
		mflash_bank->rst_pin.port[0] = (uint16_t)
			tolower((unsigned)str[0]);

	mflash_bank->target = target;

	for (i = 0; mflash_gpio[i]; i++) {
		if (!strcmp(mflash_gpio[i]->name, CMD_ARGV[0]))
			mflash_bank->gpio_drv = mflash_gpio[i];
	}

	if (!mflash_bank->gpio_drv) {
		LOG_ERROR("%s is unsupported soc", CMD_ARGV[0]);
		return ERROR_MG_UNSUPPORTED_SOC;
	}

	return ERROR_OK;
}

static const struct command_registration mflash_config_command_handlers[] = {
	{
		.name = "bank",
		.handler = mg_bank_cmd,
		.mode = COMMAND_CONFIG,
		.help = "configure a mflash device bank",
		.usage = "soc_type base_addr pin_id target",
	},
	{
		.name = "init",
		.mode = COMMAND_CONFIG,
		.handler = handle_mflash_init_command,
		.help = "initialize mflash devices",
		.usage = ""
	},
	COMMAND_REGISTRATION_DONE
};
static const struct command_registration mflash_command_handler[] = {
	{
		.name = "mflash",
		.mode = COMMAND_ANY,
		.help = "mflash command group",
		.usage = "",
		.chain = mflash_config_command_handlers,
	},
	COMMAND_REGISTRATION_DONE
};
int mflash_register_commands(struct command_context *cmd_ctx)
{
	return register_commands(cmd_ctx, NULL, mflash_command_handler);
}