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/*
* This file is part of the flashrom project.
*
* Copyright (C) 2007, 2008, 2009 Carl-Daniel Hailfinger
* Copyright (C) 2008 coresystems GmbH
*
* 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; version 2 of the License.
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/*
* Contains the generic SPI framework
*/
#include <strings.h>
#include <string.h>
#include "flash.h"
#include "flashchips.h"
#include "chipdrivers.h"
#include "programmer.h"
#include "spi.h"
const struct spi_programmer spi_programmer_none = {
.type = SPI_CONTROLLER_NONE,
.max_data_read = MAX_DATA_UNSPECIFIED,
.max_data_write = MAX_DATA_UNSPECIFIED,
.command = NULL,
.multicommand = NULL,
.read = NULL,
.write_256 = NULL,
};
const struct spi_programmer *spi_programmer = &spi_programmer_none;
int spi_send_command(unsigned int writecnt, unsigned int readcnt,
const unsigned char *writearr, unsigned char *readarr)
{
if (!spi_programmer->command) {
msg_perr("%s called, but SPI is unsupported on this "
"hardware. Please report a bug at "
"flashrom@flashrom.org\n", __func__);
return 1;
}
return spi_programmer->command(writecnt, readcnt,
writearr, readarr);
}
int spi_send_multicommand(struct spi_command *cmds)
{
if (!spi_programmer->multicommand) {
msg_perr("%s called, but SPI is unsupported on this "
"hardware. Please report a bug at "
"flashrom@flashrom.org\n", __func__);
return 1;
}
return spi_programmer->multicommand(cmds);
}
int default_spi_send_command(unsigned int writecnt, unsigned int readcnt,
const unsigned char *writearr, unsigned char *readarr)
{
struct spi_command cmd[] = {
{
.writecnt = writecnt,
.readcnt = readcnt,
.writearr = writearr,
.readarr = readarr,
}, {
.writecnt = 0,
.writearr = NULL,
.readcnt = 0,
.readarr = NULL,
}};
return spi_send_multicommand(cmd);
}
int default_spi_send_multicommand(struct spi_command *cmds)
{
int result = 0;
for (; (cmds->writecnt || cmds->readcnt) && !result; cmds++) {
result = spi_send_command(cmds->writecnt, cmds->readcnt,
cmds->writearr, cmds->readarr);
}
return result;
}
int default_spi_read(struct flashchip *flash, uint8_t *buf, int start, int len)
{
int max_data = spi_programmer->max_data_read;
if (max_data == MAX_DATA_UNSPECIFIED) {
msg_perr("%s called, but SPI read chunk size not defined "
"on this hardware. Please report a bug at "
"flashrom@flashrom.org\n", __func__);
return 1;
}
return spi_read_chunked(flash, buf, start, len, max_data);
}
int default_spi_write_256(struct flashchip *flash, uint8_t *buf, int start, int len)
{
int max_data = spi_programmer->max_data_write;
if (max_data == MAX_DATA_UNSPECIFIED) {
msg_perr("%s called, but SPI write chunk size not defined "
"on this hardware. Please report a bug at "
"flashrom@flashrom.org\n", __func__);
return 1;
}
return spi_write_chunked(flash, buf, start, len, max_data);
}
int spi_chip_read(struct flashchip *flash, uint8_t *buf, int start, int len)
{
int addrbase = 0;
if (!spi_programmer->read) {
msg_perr("%s called, but SPI read is unsupported on this "
"hardware. Please report a bug at "
"flashrom@flashrom.org\n", __func__);
return 1;
}
/* Check if the chip fits between lowest valid and highest possible
* address. Highest possible address with the current SPI implementation
* means 0xffffff, the highest unsigned 24bit number.
*/
addrbase = spi_get_valid_read_addr();
if (addrbase + flash->total_size * 1024 > (1 << 24)) {
msg_perr("Flash chip size exceeds the allowed access window. ");
msg_perr("Read will probably fail.\n");
/* Try to get the best alignment subject to constraints. */
addrbase = (1 << 24) - flash->total_size * 1024;
}
/* Check if alignment is native (at least the largest power of two which
* is a factor of the mapped size of the chip).
*/
if (ffs(flash->total_size * 1024) > (ffs(addrbase) ? : 33)) {
msg_perr("Flash chip is not aligned natively in the allowed "
"access window.\n");
msg_perr("Read will probably return garbage.\n");
}
return spi_programmer->read(flash, buf, addrbase + start, len);
}
/*
* Program chip using page (256 bytes) programming.
* Some SPI masters can't do this, they use single byte programming instead.
* The redirect to single byte programming is achieved by setting
* .write_256 = spi_chip_write_1
*/
/* real chunksize is up to 256, logical chunksize is 256 */
int spi_chip_write_256(struct flashchip *flash, uint8_t *buf, int start, int len)
{
if (!spi_programmer->write_256) {
msg_perr("%s called, but SPI page write is unsupported on this "
"hardware. Please report a bug at "
"flashrom@flashrom.org\n", __func__);
return 1;
}
return spi_programmer->write_256(flash, buf, start, len);
}
/*
* Get the lowest allowed address for read accesses. This often happens to
* be the lowest allowed address for all commands which take an address.
* This is a programmer limitation.
*/
uint32_t spi_get_valid_read_addr(void)
{
switch (spi_programmer->type) {
#if CONFIG_INTERNAL == 1
#if defined(__i386__) || defined(__x86_64__)
case SPI_CONTROLLER_ICH7:
/* Return BBAR for ICH chipsets. */
return ichspi_bbar;
#endif
#endif
default:
return 0;
}
}
void register_spi_programmer(const struct spi_programmer *pgm)
{
spi_programmer = pgm;
buses_supported |= BUS_SPI;
}
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