spi.c

/*
 * 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 <string.h>
#include "flash.h"
#include "flashchips.h"
#include "chipdrivers.h"
#include "spi.h"

enum spi_controller spi_controller = SPI_CONTROLLER_NONE;
void *spibar = NULL;

void spi_prettyprint_status_register(struct flashchip *flash);

const struct spi_programmer spi_programmer[] = {
	{ /* SPI_CONTROLLER_NONE */
		.command = NULL,
		.multicommand = NULL,
		.read = NULL,
		.write_256 = NULL,
	},

#if INTERNAL_SUPPORT == 1
#if defined(__i386__) || defined(__x86_64__)
	{ /* SPI_CONTROLLER_ICH7 */
		.command = ich_spi_send_command,
		.multicommand = ich_spi_send_multicommand,
		.read = ich_spi_read,
		.write_256 = ich_spi_write_256,
	},

	{ /* SPI_CONTROLLER_ICH9 */
		.command = ich_spi_send_command,
		.multicommand = ich_spi_send_multicommand,
		.read = ich_spi_read,
		.write_256 = ich_spi_write_256,
	},

	{ /* SPI_CONTROLLER_IT87XX */
		.command = it8716f_spi_send_command,
		.multicommand = default_spi_send_multicommand,
		.read = it8716f_spi_chip_read,
		.write_256 = it8716f_spi_chip_write_256,
	},

	{ /* SPI_CONTROLLER_SB600 */
		.command = sb600_spi_send_command,
		.multicommand = default_spi_send_multicommand,
		.read = sb600_spi_read,
		.write_256 = sb600_spi_write_1,
	},

	{ /* SPI_CONTROLLER_VIA */
		.command = ich_spi_send_command,
		.multicommand = ich_spi_send_multicommand,
		.read = ich_spi_read,
		.write_256 = ich_spi_write_256,
	},

	{ /* SPI_CONTROLLER_WBSIO */
		.command = wbsio_spi_send_command,
		.multicommand = default_spi_send_multicommand,
		.read = wbsio_spi_read,
		.write_256 = wbsio_spi_write_1,
	},
#endif
#endif

#if FT2232_SPI_SUPPORT == 1
	{ /* SPI_CONTROLLER_FT2232 */
		.command = ft2232_spi_send_command,
		.multicommand = default_spi_send_multicommand,
		.read = ft2232_spi_read,
		.write_256 = ft2232_spi_write_256,
	},
#endif

#if DUMMY_SUPPORT == 1
	{ /* SPI_CONTROLLER_DUMMY */
		.command = dummy_spi_send_command,
		.multicommand = default_spi_send_multicommand,
		.read = NULL,
		.write_256 = NULL,
	},
#endif

#if BUSPIRATE_SPI_SUPPORT == 1
	{ /* SPI_CONTROLLER_BUSPIRATE */
		.command = buspirate_spi_send_command,
		.multicommand = default_spi_send_multicommand,
		.read = buspirate_spi_read,
		.write_256 = buspirate_spi_write_256,
	},
#endif

#if DEDIPROG_SUPPORT == 1
	{ /* SPI_CONTROLLER_DEDIPROG */
		.command = dediprog_spi_send_command,
		.multicommand = default_spi_send_multicommand,
		.read = dediprog_spi_read,
		.write_256 = spi_chip_write_1,
	},
#endif

	{}, /* This entry corresponds to SPI_CONTROLLER_INVALID. */
};

const int spi_programmer_count = ARRAY_SIZE(spi_programmer);

int spi_send_command(unsigned int writecnt, unsigned int readcnt,
		const unsigned char *writearr, unsigned char *readarr)
{
	if (!spi_programmer[spi_controller].command) {
		msg_perr("%s called, but SPI is unsupported on this "
			"hardware. Please report a bug.\n", __func__);
		return 1;
	}

	return spi_programmer[spi_controller].command(writecnt, readcnt,
						      writearr, readarr);
}

int spi_send_multicommand(struct spi_command *cmds)
{
	if (!spi_programmer[spi_controller].multicommand) {
		msg_perr("%s called, but SPI is unsupported on this "
			"hardware. Please report a bug.\n", __func__);
		return 1;
	}

	return spi_programmer[spi_controller].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 spi_chip_read(struct flashchip *flash, uint8_t *buf, int start, int len)
{
	if (!spi_programmer[spi_controller].read) {
		msg_perr("%s called, but SPI read is unsupported on this"
			" hardware. Please report a bug.\n", __func__);
		return 1;
	}

	return spi_programmer[spi_controller].read(flash, buf, start, len);
}

/*
 * Program chip using page (256 bytes) programming.
 * Some SPI masters can't do this, they use single byte programming instead.
 */
int spi_chip_write_256(struct flashchip *flash, uint8_t *buf)
{
	if (!spi_programmer[spi_controller].write_256) {
		msg_perr("%s called, but SPI page write is unsupported "
			" on this hardware. Please report a bug.\n", __func__);
		return 1;
	}

	return spi_programmer[spi_controller].write_256(flash, buf);
}

/*
 * 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_controller) {
#if INTERNAL_SUPPORT == 1
#if defined(__i386__) || defined(__x86_64__)
	case SPI_CONTROLLER_ICH7:
		/* Return BBAR for ICH chipsets. */
		return ichspi_bbar;
#endif
#endif
	default:
		return 0;
	}
}