openocd/src/flash/nor/core.h

/***************************************************************************
 *   Copyright (C) 2005 by Dominic Rath <Dominic.Rath@gmx.de>              *
 *   Copyright (C) 2007,2008 Øyvind Harboe <oyvind.harboe@zylin.com>       *
 *   Copyright (C) 2008 by Spencer Oliver <spen@spen-soft.co.uk>           *
 *   Copyright (C) 2009 Zachary T Welch <zw@superlucidity.net>             *
 *                                                                         *
 *   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.             *
 ***************************************************************************/
#ifndef FLASH_NOR_CORE_H
#define FLASH_NOR_CORE_H

#include <flash/common.h>

/**
 * @file
 * Upper level NOR flash interfaces.
 */

struct image;

#define FLASH_MAX_ERROR_STR	(128)

/**
 * Describes the geometry and status of a single flash sector
 * within a flash bank.  A single bank typically consists of multiple
 * sectors, each of which can be erased and protected independently.
 */
struct flash_sector
{
	/// Bus offset from start of the flash chip (in bytes).
	uint32_t offset;
	/// Number of bytes in this flash sector.
	uint32_t size;
	/**
	 * Indication of erasure status: 0 = not erased, 1 = erased,
	 * other = unknown.  Set by @c flash_driver_s::erase_check.
	 */
	int is_erased;
	/**
	 * Indication of protection status: 0 = unprotected/unlocked,
	 * 1 = protected/locked, other = unknown.  Set by
	 * @c flash_driver_s::protect_check.
	 */
	int is_protected;
};

/**
 * Provides details of a flash bank, available either on-chip or through
 * a major interface.
 *
 * This structure will be passed as a parameter to the callbacks in the
 * flash_driver_s structure, some of which may modify the contents of
 * this structure of the area of flash that it defines.  Driver writers
 * may use the @c driver_priv member to store additional data on a
 * per-bank basis, if required.
 */
struct flash_bank
{
	char *name;

	struct target *target; /**< Target to which this bank belongs. */

	struct flash_driver *driver; /**< Driver for this bank. */
	void *driver_priv; /**< Private driver storage pointer */

	int bank_number; /**< The 'bank' (or chip number) of this instance. */
	uint32_t base; /**< The base address of this bank */
	uint32_t size; /**< The size of this chip bank, in bytes */

	int chip_width; /**< Width of the chip in bytes (1,2,4 bytes) */
	int bus_width; /**< Maximum bus width, in bytes (1,2,4 bytes) */

	/**
	 * The number of sectors on this chip.  This value will
	 * be set intially to 0, and the flash driver must set this to
	 * some non-zero value during "probe()" or "auto_probe()".
	 */
	int num_sectors;
	/// Array of sectors, allocated and initilized by the flash driver
	struct flash_sector *sectors;

	struct flash_bank *next; /**< The next flash bank on this chip */
};

/// Registers the 'flash' subsystem commands
int flash_register_commands(struct command_context *cmd_ctx);
/// Initializes the 'flash' subsystem drivers
int flash_init_drivers(struct command_context *cmd_ctx);

/**
 * Erases @a length bytes in the @a target flash, starting at @a addr.
 * The range @a addr to @a addr + @a length - 1 must be strictly
 * sector aligned, unless @a pad is true.  Setting @a pad true extends
 * the range, at beginning and/or end, if needed for sector alignment.
 * @returns ERROR_OK if successful; otherwise, an error code.
 */
int flash_erase_address_range(struct target *target,
		bool pad, uint32_t addr, uint32_t length);

/**
 * Writes @a image into the @a target flash.  The @a written parameter
 * will contain the
 * @param target The target with the flash to be programmed.
 * @param image The image that will be programmed to flash.
 * @param written On return, contains the number of bytes written.
 * @param erase If non-zero, indicates the flash driver should first
 * erase the corresponding banks or sectors before programming.
 * @returns ERROR_OK if successful; otherwise, an error code.
 */
int flash_write(struct target *target,
		struct image *image, uint32_t *written, int erase);

/* invalidate cached state (targets may modify their own flash) */
void nor_resume(struct target *target);

/**
 * Forces targets to re-examine their erase/protection state.
 * This routine must be called when the system may modify the status.
 */
void flash_set_dirty(void);
/// @returns The number of flash banks currently defined.
int flash_get_bank_count(void);
/**
 * Provides default erased-bank check handling. Checks to see if
 * the flash driver knows they are erased; if things look uncertain,
 * this routine will call default_flash_mem_blank_check() to confirm.
 * @returns ERROR_OK if successful; otherwise, an error code.
 */
int default_flash_blank_check(struct flash_bank *bank);
/**
 * Provides a default blank flash memory check.  Ensures the contents
 * of the given bank have truly been erased.
 * @param bank The flash bank.
 * @returns ERROR_OK if successful; otherwise, an error code.
 */
int default_flash_mem_blank_check(struct flash_bank *bank);

/**
 * Returns the flash bank specified by @a name, which matches the
 * driver name and a suffix (option) specify the driver-specific
 * bank number. The suffix consists of the '.' and the driver-specific
 * bank number: when two str9x banks are defined, then 'str9x.1' refers
 * to the second.
 */
struct flash_bank *get_flash_bank_by_name(const char *name);
/**
 * Returns a flash bank by the specified flash_bank_s bank_number, @a num.
 * @param num The flash bank number.
 * @returns A struct flash_bank for flash bank @a num, or NULL
 */
struct flash_bank *get_flash_bank_by_num(int num);
/**
 * Retreives @a bank from a command argument, reporting errors parsing
 * the bank identifier or retreiving the specified bank.  The bank
 * may be identified by its bank number or by @c name.instance, where
 * @a instance is driver-specific.
 * @param name_index The index to the string in args containing the
 * bank identifier.
 * @param bank On output, contians a pointer to the bank or NULL.
 * @returns ERROR_OK on success, or an error indicating the problem.
 */
COMMAND_HELPER(flash_command_get_bank, unsigned name_index,
		struct flash_bank **bank);
/**
 * Returns the flash bank like get_flash_bank_by_num(), without probing.
 * @param num The flash bank number.
 * @returns A struct flash_bank for flash bank @a num, or NULL.
 */
struct flash_bank *get_flash_bank_by_num_noprobe(int num);
/**
 * Returns the flash bank located at a specified address.
 * @param target The target, presumed to contain one or more banks.
 * @param addr An address that is within the range of the bank.
 * @returns The struct flash_bank located at @a addr, or NULL.
 */
struct flash_bank *get_flash_bank_by_addr(struct target *target, uint32_t addr);

#endif // FLASH_NOR_CORE_H