/***************************************************************************
 *   Copyright (C) 2007,2008 Øyvind Harboe                                 *
 *   oyvind.harboe@zylin.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, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "flash.h"
#include "embeddedice.h"
#include "image.h"


#if 0
static uint32_t ecosflash_get_flash_status(struct flash_bank *bank);
static void ecosflash_set_flash_mode(struct flash_bank *bank,int mode);
static uint32_t ecosflash_wait_status_busy(struct flash_bank *bank, uint32_t waitbits, int timeout);
static int ecosflash_handle_gpnvm_command(struct command_context *cmd_ctx, char *cmd, char **args, int argc);
#endif

struct ecosflash_flash_bank
{
	struct target *target;
	struct working_area *write_algorithm;
	struct working_area *erase_check_algorithm;
	char *driverPath;
	uint32_t start_address;
};

static const int sectorSize = 0x10000;

char *
flash_errmsg(int err);

#ifndef __ECOS
#define FLASH_ERR_OK              0x00  /* No error - operation complete */
#define FLASH_ERR_INVALID         0x01  /* Invalid FLASH address */
#define FLASH_ERR_ERASE           0x02  /* Error trying to erase */
#define FLASH_ERR_LOCK            0x03  /* Error trying to lock/unlock */
#define FLASH_ERR_PROGRAM         0x04  /* Error trying to program */
#define FLASH_ERR_PROTOCOL        0x05  /* Generic error */
#define FLASH_ERR_PROTECT         0x06  /* Device/region is write-protected */
#define FLASH_ERR_NOT_INIT        0x07  /* FLASH info not yet initialized */
#define FLASH_ERR_HWR             0x08  /* Hardware (configuration?) problem */
#define FLASH_ERR_ERASE_SUSPEND   0x09  /* Device is in erase suspend mode */
#define FLASH_ERR_PROGRAM_SUSPEND 0x0a  /* Device is in in program suspend mode */
#define FLASH_ERR_DRV_VERIFY      0x0b  /* Driver failed to verify data */
#define FLASH_ERR_DRV_TIMEOUT     0x0c  /* Driver timed out waiting for device */
#define FLASH_ERR_DRV_WRONG_PART  0x0d  /* Driver does not support device */
#define FLASH_ERR_LOW_VOLTAGE     0x0e  /* Not enough juice to complete job */

char *
flash_errmsg(int err)
{
	switch (err) {
	case FLASH_ERR_OK:
		return "No error - operation complete";
	case FLASH_ERR_ERASE_SUSPEND:
		return "Device is in erase suspend state";
	case FLASH_ERR_PROGRAM_SUSPEND:
		return "Device is in program suspend state";
	case FLASH_ERR_INVALID:
		return "Invalid FLASH address";
	case FLASH_ERR_ERASE:
		return "Error trying to erase";
	case FLASH_ERR_LOCK:
		return "Error trying to lock/unlock";
	case FLASH_ERR_PROGRAM:
		return "Error trying to program";
	case FLASH_ERR_PROTOCOL:
		return "Generic error";
	case FLASH_ERR_PROTECT:
		return "Device/region is write-protected";
	case FLASH_ERR_NOT_INIT:
		return "FLASH sub-system not initialized";
	case FLASH_ERR_DRV_VERIFY:
		return "Data verify failed after operation";
	case FLASH_ERR_DRV_TIMEOUT:
		return "Driver timed out waiting for device";
	case FLASH_ERR_DRV_WRONG_PART:
		return "Driver does not support device";
	case FLASH_ERR_LOW_VOLTAGE:
		return "Device reports low voltage";
	default:
		return "Unknown error";
	}
}
#endif

/* flash bank ecosflash <base> <size> <chip_width> <bus_width> <target#> <driverPath>
 */
FLASH_BANK_COMMAND_HANDLER(ecosflash_flash_bank_command)
{
	struct ecosflash_flash_bank *info;

	if (argc < 7)
	{
		LOG_WARNING("incomplete flash_bank ecosflash configuration");
		return ERROR_FLASH_BANK_INVALID;
	}

	info = malloc(sizeof(struct ecosflash_flash_bank));
	if (info == NULL)
	{
		LOG_ERROR("no memory for flash bank info");
		exit(-1);
	}
	bank->driver_priv = info;
	info->driverPath = strdup(args[6]);

	/* eCos flash sector sizes are not exposed to OpenOCD, use 0x10000 as
	 * a way to improve impedance match between OpenOCD and eCos flash
	 * driver.
	 */
	int i = 0;
	uint32_t offset = 0;
	bank->num_sectors = bank->size/sectorSize;
	bank->sectors = malloc(sizeof(struct flash_sector) * bank->num_sectors);
	for (i = 0; i < bank->num_sectors; i++)
	{
		bank->sectors[i].offset = offset;
		bank->sectors[i].size = sectorSize;
		offset += bank->sectors[i].size;
		bank->sectors[i].is_erased = -1;
		bank->sectors[i].is_protected = 0;
	}

	info->target = get_target(args[5]);
	if (info->target == NULL)
	{
		LOG_ERROR("target '%s' not defined", args[5]);
		return ERROR_FAIL;
	}
	return ERROR_OK;
}

static int loadDriver(struct ecosflash_flash_bank *info)
{
	uint32_t buf_cnt;
	uint32_t image_size;
	struct image image;

	image.base_address_set = 0;
	image.start_address_set = 0;
	struct target *target = info->target;
	int retval;

	if ((retval = image_open(&image, info->driverPath, NULL)) != ERROR_OK)
	{
		return retval;
	}

	info->start_address = image.start_address;

	image_size = 0x0;
	int i;
	for (i = 0; i < image.num_sections; i++)
	{
		void *buffer = malloc(image.sections[i].size);
		int retval;
		if ((retval = image_read_section(&image, i, 0x0, image.sections[i].size, buffer, &buf_cnt)) != ERROR_OK)
		{
			free(buffer);
			image_close(&image);
			return retval;
		}
		target_write_buffer(target, image.sections[i].base_address, buf_cnt, buffer);
		image_size += buf_cnt;
		LOG_DEBUG("%" PRIu32 " byte written at address 0x%8.8" PRIx32 "", buf_cnt, image.sections[i].base_address);

		free(buffer);
	}

	image_close(&image);

	return ERROR_OK;
}

static int const OFFSET_ERASE = 0x0;
static int const OFFSET_ERASE_SIZE = 0x8;
static int const OFFSET_FLASH = 0xc;
static int const OFFSET_FLASH_SIZE = 0x8;
static int const OFFSET_GET_WORKAREA = 0x18;
static int const OFFSET_GET_WORKAREA_SIZE = 0x4;

static int runCode(struct ecosflash_flash_bank *info,
		uint32_t codeStart, uint32_t codeStop, uint32_t r0, uint32_t r1, uint32_t r2,
		uint32_t *result,
		/* timeout in ms */
		int timeout)
{
	struct target *target = info->target;

	struct reg_param reg_params[3];
	struct armv4_5_algorithm armv4_5_info;
	armv4_5_info.common_magic = ARMV4_5_COMMON_MAGIC;
	armv4_5_info.core_mode = ARMV4_5_MODE_SVC;
	armv4_5_info.core_state = ARMV4_5_STATE_ARM;

	init_reg_param(&reg_params[0], "r0", 32, PARAM_IN_OUT);
	init_reg_param(&reg_params[1], "r1", 32, PARAM_OUT);
	init_reg_param(&reg_params[2], "r2", 32, PARAM_OUT);

	buf_set_u32(reg_params[0].value, 0, 32, r0);
	buf_set_u32(reg_params[1].value, 0, 32, r1);
	buf_set_u32(reg_params[2].value, 0, 32, r2);

	int retval;
	if ((retval = target_run_algorithm(target, 0, NULL, 3, reg_params,
			codeStart,
			codeStop, timeout,
			&armv4_5_info)) != ERROR_OK)
	{
		LOG_ERROR("error executing eCos flash algorithm");
		return retval;
	}

	*result = buf_get_u32(reg_params[0].value, 0, 32);

	destroy_reg_param(&reg_params[0]);
	destroy_reg_param(&reg_params[1]);
	destroy_reg_param(&reg_params[2]);

	return ERROR_OK;
}

static int eCosBoard_erase(struct ecosflash_flash_bank *info, uint32_t address, uint32_t len)
{
	int retval;
	int timeout = (len / 20480 + 1) * 1000; /*asume 20 KB/s*/

	retval = loadDriver(info);
	if (retval != ERROR_OK)
		return retval;

	uint32_t flashErr;
	retval = runCode(info,
			info->start_address + OFFSET_ERASE,
			info->start_address + OFFSET_ERASE + OFFSET_ERASE_SIZE,
			address,
			len,
			0,
			&flashErr,
			timeout
);
	if (retval != ERROR_OK)
		return retval;

	if (flashErr != 0x0)
	{
		LOG_ERROR("Flash erase failed with %d (%s)\n", (int)flashErr, flash_errmsg(flashErr));
		return ERROR_FAIL;
	}

	return ERROR_OK;
}

static int eCosBoard_flash(struct ecosflash_flash_bank *info, void *data, uint32_t address, uint32_t len)
{
	struct target *target = info->target;
	const int chunk = 8192;
	int retval = ERROR_OK;
	int timeout = (chunk / 20480 + 1) * 1000; /*asume 20 KB/s + 1 second*/

	retval = loadDriver(info);
	if (retval != ERROR_OK)
		return retval;

	uint32_t buffer;
	retval = runCode(info,
			info->start_address + OFFSET_GET_WORKAREA,
			info->start_address + OFFSET_GET_WORKAREA + OFFSET_GET_WORKAREA_SIZE,
			0,
			0,
			0,
			&buffer,
			1000);
	if (retval != ERROR_OK)
		return retval;


	uint32_t i;
	for (i = 0; i < len; i += chunk)
	{
		int t = len-i;
		if (t > chunk)
		{
			t = chunk;
		}

		int retval;
		retval = target_write_buffer(target, buffer, t, ((uint8_t *)data) + i);
		if (retval != ERROR_OK)
			return retval;

		uint32_t flashErr;
		retval = runCode(info,
				info->start_address + OFFSET_FLASH,
				info->start_address + OFFSET_FLASH + OFFSET_FLASH_SIZE,
				buffer,
				address + i,
				t,
				&flashErr,
				timeout);
		if (retval != ERROR_OK)
			return retval;

		if (flashErr != 0x0)
		{
			LOG_ERROR("Flash prog failed with %d (%s)\n", (int)flashErr, flash_errmsg(flashErr));
			return ERROR_FAIL;
		}
	}
	return ERROR_OK;
}

static int ecosflash_probe(struct flash_bank *bank)
{
	return ERROR_OK;
}

static int ecosflash_register_commands(struct command_context *cmd_ctx)
{
	register_command(cmd_ctx, NULL, "ecosflash", NULL, COMMAND_ANY, NULL);

	return ERROR_OK;
}

#if 0
static void command(struct flash_bank *bank, uint8_t cmd, uint8_t *cmd_buf)
{
	struct ecosflash_flash_bank *info = bank->driver_priv;
	int i;

	if (info->target->endianness == TARGET_LITTLE_ENDIAN)
	{
		for (i = bank->bus_width; i > 0; i--)
		{
			*cmd_buf++ = (i & (bank->chip_width - 1)) ? 0x0 : cmd;
		}
	}
	else
	{
		for (i = 1; i <= bank->bus_width; i++)
		{
			*cmd_buf++ = (i & (bank->chip_width - 1)) ? 0x0 : cmd;
		}
	}
}
#endif

#if 0
static uint32_t ecosflash_address(struct flash_bank *bank, uint32_t address)
{
	uint32_t retval = 0;
	switch (bank->bus_width)
	{
		case 4:
			retval = address & 0xfffffffc;
		case 2:
			retval = address & 0xfffffffe;
		case 1:
			retval = address;
	}

	return retval + bank->base;
}
#endif

static int ecosflash_erase(struct flash_bank *bank, int first, int last)
{
	struct flash_bank *c = bank;
	struct ecosflash_flash_bank *info = bank->driver_priv;
	return eCosBoard_erase(info, c->base + first*sectorSize, sectorSize*(last-first + 1));
}

static int ecosflash_protect(struct flash_bank *bank, int set, int first, int last)
{
	return ERROR_OK;
}

static int ecosflash_write(struct flash_bank *bank, uint8_t *buffer, uint32_t offset, uint32_t count)
{
	struct ecosflash_flash_bank *info = bank->driver_priv;
	struct flash_bank *c = bank;
	return eCosBoard_flash(info, buffer, c->base + offset, count);
}

static int ecosflash_protect_check(struct flash_bank *bank)
{
	return ERROR_OK;
}

static int ecosflash_info(struct flash_bank *bank, char *buf, int buf_size)
{
	struct ecosflash_flash_bank *info = bank->driver_priv;
	snprintf(buf, buf_size, "eCos flash driver: %s", info->driverPath);
	return ERROR_OK;
}

#if 0
static uint32_t ecosflash_get_flash_status(struct flash_bank *bank)
{
	return ERROR_OK;
}

static void ecosflash_set_flash_mode(struct flash_bank *bank,int mode)
{

}

static uint32_t ecosflash_wait_status_busy(struct flash_bank *bank, uint32_t waitbits, int timeout)
{
	return ERROR_OK;
}

static int ecosflash_handle_gpnvm_command(struct command_context *cmd_ctx, char *cmd, char **args, int argc)
{
	return ERROR_OK;
}
#endif

struct flash_driver ecosflash_flash = {
		.name = "ecosflash",
		.register_commands = &ecosflash_register_commands,
		.flash_bank_command = &ecosflash_flash_bank_command,
		.erase = &ecosflash_erase,
		.protect = &ecosflash_protect,
		.write = &ecosflash_write,
		.probe = &ecosflash_probe,
		.auto_probe = &ecosflash_probe,
		.erase_check = &default_flash_blank_check,
		.protect_check = &ecosflash_protect_check,
		.info = &ecosflash_info
	};