/*-
* Copyright (c) 2006 Urbana-Champaign Independent Media Center.
* Copyright (c) 2006 Garrett D'Amore.
* All rights reserved.
*
* Portions of this code were written by Garrett D'Amore for the
* Champaign-Urbana Community Wireless Network Project.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgements:
* This product includes software developed by the Urbana-Champaign
* Independent Media Center.
* This product includes software developed by Garrett D'Amore.
* 4. Urbana-Champaign Independent Media Center's name and Garrett
* D'Amore's name may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE URBANA-CHAMPAIGN INDEPENDENT
* MEDIA CENTER AND GARRETT D'AMORE ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE URBANA-CHAMPAIGN INDEPENDENT
* MEDIA CENTER OR GARRETT D'AMORE BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Different chips offer different ways to read a device ID, although
* newer parts should all offer the standard JEDEC variant.
* Additionally, many parts have a faster read, though how to make use
* of this sometimes requires special hacks. E.g. some parts use an
* extra data pin, and some crank the clock rate up.
*/
#define SPIFLASH_CMD_READ 0x03 /* read data (normal) */
#define SPIFLASH_CMD_RDID 0xab /* read id */
#define SPIFLASH_CMD_RDID2 0x90 /* read id (alternate) */
#define SPIFLASH_CMD_RDJI 0x9f /* read JEDEC id */
#define SPIFLASH_CMD_READFAST 0x0b /* fast read */
/*
* Different chips offer different variations on the sector erase.
* E.g. SST parts offer 4k, 32k, and 64k erase sizes on the same part,
* with just different cmds. However, at least SST, AMD, and Winbond
* all offer at least the main (0xd8) variant.
*/
#define SPIFLASH_CMD_ERASE 0xd8 /* sector erase */
#define SPIFLASH_CMD_ERASE2 0x52 /* sector erase (alternate) */
#define SPIFLASH_CMD_ERASE3 0x20 /* sector erase (alternate) */
#define SPIFLASH_CMD_ERASE4 0x81 /* page erase */
#define SPIFLASH_CMD_CHIPERASE 0xc7 /* chip erase */
/*
* Some parts can stream bytes with the program command, whereas others require
* a separate command sequence for each byte.
*/
#define SPIFLASH_CMD_PROGRAM 0x02 /* page or byte program */
#define SPIFLASH_CMD_PROGRAM_AA 0xad /* program (autoincrement) */
/*
* Some additional commands. Again, mostly device specific.
*/
#define SPIFLASH_CMD_EBSY 0x70 /* output busy signal (SST) */
#define SPIFLASH_CMD_DBSY 0x80 /* disable busy signal (SST) */
/*
* Status register bits. Not all devices implement all bits. In
* addition, the meanings of the BP bits seem to vary from device to
* device.
*/
#define SPIFLASH_SR_BUSY 0x01 /* program in progress */
#define SPIFLASH_SR_WEL 0x02 /* write enable latch */
#define SPIFLASH_SR_BP0 0x04 /* block protect bits */
#define SPIFLASH_SR_BP1 0x08
#define SPIFLASH_SR_BP2 0x10
#define SPIFLASH_SR_BP3 0x20
#define SPIFLASH_SR_AAI 0x40 /* auto-increment mode */
#define SPIFLASH_SR_SRP 0x80 /* SR write protected */
/*
* This needs to change to accommodate boot-sectored devices.
*/
typedef struct spiflash_softc *spiflash_handle_t;
struct spiflash_hw_if {
/*
* Driver MUST provide these.
*/
const char *(*sf_getname)(void *);
struct spi_handle *(*sf_gethandle)(void *);
int (*sf_getflags)(void *);
int (*sf_getsize)(void *, int);
/*
* SPI framework will provide these if the driver does not.
*/
int (*sf_erase)(spiflash_handle_t, size_t, size_t);
int (*sf_write)(spiflash_handle_t, size_t, size_t,
const uint8_t *);
int (*sf_read)(spiflash_handle_t, size_t, size_t, uint8_t *);
/*
* Not implemented yet.
*/
int (*sf_getstatus)(spiflash_handle_t, int, int);
int (*sf_setstatus)(spiflash_handle_t, int, int, int);
};
