libflash/libflash.h

/* Copyright 2013-2014 IBM Corp.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * 	http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 * implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#ifndef __LIBFLASH_H
#define __LIBFLASH_H

#include <stdint.h>
#include <stdbool.h>
#include <libflash/blocklevel.h>

/* API status/return:
 *
 *  <0 = flash controller errors passed through,
 *  0  = success
 *  >0 = libflash error
 */
#include <libflash/errors.h>

#ifdef __SKIBOOT__
#include <skiboot.h>
#define FL_INF(fmt...) do { prlog(PR_INFO, fmt);  } while(0)
#define FL_DBG(fmt...) do { prlog(PR_DEBUG, fmt); } while(0)
#define FL_ERR(fmt...) do { prlog(PR_ERR, fmt);   } while(0)
#else
#include <stdio.h>
extern bool libflash_debug;
#define FL_DBG(fmt...) do { if (libflash_debug) printf(fmt); } while(0)
#define FL_INF(fmt...) do { printf(fmt); } while(0)
#define FL_ERR(fmt...) do { printf(fmt); } while(0)
#endif

/* Flash chip, opaque */
struct flash_chip;
struct spi_flash_ctrl;

int flash_init(struct spi_flash_ctrl *ctrl, struct blocklevel_device **bl,
		struct flash_chip **flash_chip);
void flash_exit(struct blocklevel_device *bl);

/*
 * Function which till call close on the underlying struct spi_flash_ctrl
 */
void flash_exit_close(struct blocklevel_device *bl, void (*close)(struct spi_flash_ctrl *ctrl));

/* libflash sets the 4b mode automatically based on the flash
 * size and controller capabilities but it can be overriden
 */
int flash_force_4b_mode(struct flash_chip *c, bool enable_4b);

/*
 * This provides a wapper around flash_read() on ECCed data. All params are
 * the same as to flash_read(). Not passing true in ecc is akin to calling
 * flash_read() directly.
 *
 * len is length of data without ecc attached therefore this will read beyond
 * pos + len.
 */
int flash_read_corrected(struct blocklevel_device *bl, uint32_t pos, void *buf,
		uint32_t len, bool ecc);

/*
 * This provides a wrapper around flash_write() on ECCed data. All params are
 * the same as to flash_write(). Not passing true in ecc is akin to calling
 * flash_write() directly.
 *
 * size is length of data without ECC attached therefore this will write beyond
 * dst + size.
 */
int flash_write_corrected(struct blocklevel_device *bl, uint32_t dst, const void *src,
		uint32_t size, bool verify, bool ecc);

/*
 * This provides a wrapper around flash_smart_write() on ECCed data. All
 * params are the same as to flash_smart_write(). Not passing true in ecc is
 * akin to calling flash_smart_write() directly.
 *
 * size is length of data without ECC attached therefore this will write beyond
 * dst + size.
 */
int flash_smart_write_corrected(struct blocklevel_device *bl, uint32_t dst, const void *src,
		      uint32_t size, bool ecc);

/* chip erase may not be supported by all chips/controllers, get ready
 * for FLASH_ERR_CHIP_ER_NOT_SUPPORTED
 */
int flash_erase_chip(struct flash_chip *c);

#endif /* __LIBFLASH_H */