it87spi.c - chromiumos/third_party/flashrom - Git at Google

 /*
  * This file is part of the flashrom project.
  *
  * Copyright (C) 2007, 2008, 2009 Carl-Daniel Hailfinger
  * Copyright (C) 2008 Ronald Hoogenboom <ronald@zonnet.nl>
  * 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 ITE IT87* SPI specific routines
  */

 #if defined(__i386__) || defined(__x86_64__)

 #include <string.h>
 #include <stdlib.h>
 #include "flash.h"
 #include "chipdrivers.h"
 #include "programmer.h"
 #include "spi.h"

 #define ITE_SUPERIO_PORT1	0x2e
 #define ITE_SUPERIO_PORT2	0x4e

 uint16_t it8716f_flashport = 0;
 /* use fast 33MHz SPI (<>0) or slow 16MHz (0) */
 static int fast_spi = 1;

 /* Helper functions for most recent ITE IT87xx Super I/O chips */
 #define CHIP_ID_BYTE1_REG	0x20
 #define CHIP_ID_BYTE2_REG	0x21
 void enter_conf_mode_ite(uint16_t port)
 {
 	OUTB(0x87, port);
 	OUTB(0x01, port);
 	OUTB(0x55, port);
 	if (port == ITE_SUPERIO_PORT1)
 		OUTB(0x55, port);
 	else
 		OUTB(0xaa, port);
 }

 void exit_conf_mode_ite(uint16_t port)
 {
 	sio_write(port, 0x02, 0x02);
 }

 uint16_t probe_id_ite(uint16_t port)
 {
 	uint16_t id;

 	enter_conf_mode_ite(port);
 	id = sio_read(port, CHIP_ID_BYTE1_REG) << 8;
 	id |= sio_read(port, CHIP_ID_BYTE2_REG);
 	exit_conf_mode_ite(port);

 	return id;
 }

 struct superio probe_superio_ite(void)
 {
 	struct superio ret = {};
 	uint16_t ite_ports[] = {ITE_SUPERIO_PORT1, ITE_SUPERIO_PORT2, 0};
 	uint16_t *i = ite_ports;

 	ret.vendor = SUPERIO_VENDOR_ITE;
 	for (; *i; i++) {
 		ret.port = *i;
 		ret.model = probe_id_ite(ret.port);
 		switch (ret.model >> 8) {
 		case 0x82:
 		case 0x86:
 		case 0x87:
 			msg_pinfo("Found ITE Super I/O, ID 0x%04hx.\n",
 				  ret.model);
 			return ret;
 		}
 	}

 	/* No good ID found. */
 	ret.vendor = SUPERIO_VENDOR_NONE;
 	ret.port = 0;
 	ret.model = 0;
 	return ret;
 }

 static uint16_t it87spi_probe(uint16_t port)
 {
 	uint8_t tmp = 0;
 	char *portpos = NULL;
 	uint16_t flashport = 0;

 	enter_conf_mode_ite(port);
 	/* NOLDN, reg 0x24, mask out lowest bit (suspend) */
 	tmp = sio_read(port, 0x24) & 0xFE;
 	/* If IT87SPI was not explicitly selected, we want to check
 	 * quickly if LPC->SPI translation is active.
 	 */
 	if ((programmer == PROGRAMMER_INTERNAL) && !(tmp & (0x0E))) {
 		msg_pdbg("No IT87* serial flash segment enabled.\n");
 		exit_conf_mode_ite(port);
 		/* Nothing to do. */
 		return 1;
 	}
 	msg_pdbg("Serial flash segment 0x%08x-0x%08x %sabled\n",
 		 0xFFFE0000, 0xFFFFFFFF, (tmp & 1 << 1) ? "en" : "dis");
 	msg_pdbg("Serial flash segment 0x%08x-0x%08x %sabled\n",
 		 0x000E0000, 0x000FFFFF, (tmp & 1 << 1) ? "en" : "dis");
 	msg_pdbg("Serial flash segment 0x%08x-0x%08x %sabled\n",
 		 0xFFEE0000, 0xFFEFFFFF, (tmp & 1 << 2) ? "en" : "dis");
 	msg_pdbg("Serial flash segment 0x%08x-0x%08x %sabled\n",
 		 0xFFF80000, 0xFFFEFFFF, (tmp & 1 << 3) ? "en" : "dis");
 	msg_pdbg("LPC write to serial flash %sabled\n",
 		 (tmp & 1 << 4) ? "en" : "dis");
 	/* The LPC->SPI force write enable below only makes sense for
 	 * non-programmer mode.
 	 */
 	/* If any serial flash segment is enabled, enable writing. */
 	if ((tmp & 0xe) && (!(tmp & 1 << 4))) {
 		msg_pdbg("Enabling LPC write to serial flash\n");
 		tmp |= 1 << 4;
 		sio_write(port, 0x24, tmp);
 	}
 	msg_pdbg("Serial flash pin %i\n", (tmp & 1 << 5) ? 87 : 29);
 	/* LDN 0x7, reg 0x64/0x65 */
 	sio_write(port, 0x07, 0x7);
 	flashport = sio_read(port, 0x64) << 8;
 	flashport |= sio_read(port, 0x65);
 	msg_pdbg("Serial flash port 0x%04x\n", flashport);
 	/* Non-default port requested? */
 	portpos = extract_programmer_param("it87spiport");
 	if (portpos) {
 		char *endptr = NULL;
 		unsigned long forced_flashport;
 		forced_flashport = strtoul(portpos, &endptr, 0);
 		/* Port 0, port >0x1000, unaligned ports and garbage strings
 		 * are rejected.
 		 */
 		if (!forced_flashport || (forced_flashport >= 0x1000) ||
 		    (forced_flashport & 0x7) || (*endptr != '\0')) {
 			/* Using ports below 0x100 is a really bad idea, and
 			 * should only be done if no port between 0x100 and
 			 * 0xff8 works due to routing issues.
 			 */
 			msg_perr("Error: it87spiport specified, but no valid "
 				 "port specified.\nPort must be a multiple of "
 				 "0x8 and lie between 0x100 and 0xff8.\n");
 			free(portpos);
 			/* FIXME: Return failure here once it87spi_common_init()
 			 * can handle the return value sanely.
 			 */
 			exit(1);
 		} else {
 			flashport = (uint16_t)forced_flashport;
 			msg_pinfo("Forcing serial flash port 0x%04x\n",
 				  flashport);
 			sio_write(port, 0x64, (flashport >> 8));
 			sio_write(port, 0x65, (flashport & 0xff));
 		}
 	}
 	free(portpos);
 	exit_conf_mode_ite(port);
 	it8716f_flashport = flashport;
 	if (buses_supported & CHIP_BUSTYPE_SPI)
 		msg_pdbg("Overriding chipset SPI with IT87 SPI.\n");
 	spi_controller = SPI_CONTROLLER_IT87XX;
 	buses_supported |= CHIP_BUSTYPE_SPI;
 	return 0;
 }

 int init_superio_ite(void)
 {
 	if (superio.vendor != SUPERIO_VENDOR_ITE)
 		return 1;

 	switch (superio.model) {
 	case 0x8705:
 		return it8705f_write_enable(superio.port);
 		break;
 	case 0x8716:
 	case 0x8718:
 	case 0x8720:
 		return it87spi_probe(superio.port);
 		break;
 	default:
 		msg_pdbg("Super I/O ID 0x%04hx is not on the list of flash "
 			 "capable controllers.\n", superio.model);
 	}
 	return 1;
 }


 int it87spi_init(void)
 {
 	int ret;

 	get_io_perms();
 	/* Probe for the Super I/O chip and fill global struct superio. */
 	probe_superio();
 	ret = init_superio_ite();
 	if (!ret) {
 		buses_supported = CHIP_BUSTYPE_SPI;
 	} else {
 		buses_supported = CHIP_BUSTYPE_NONE;
 	}
 	return ret;
 }

 /*
  * The IT8716F only supports commands with length 1,2,4,5 bytes including
  * command byte and can not read more than 3 bytes from the device.
  *
  * This function expects writearr[0] to be the first byte sent to the device,
  * whereas the IT8716F splits commands internally into address and non-address
  * commands with the address in inverse wire order. That's why the register
  * ordering in case 4 and 5 may seem strange.
  */
 int it8716f_spi_send_command(unsigned int writecnt, unsigned int readcnt,
 			const unsigned char *writearr, unsigned char *readarr)
 {
 	uint8_t busy, writeenc;
 	int i;

 	do {
 		busy = INB(it8716f_flashport) & 0x80;
 	} while (busy);
 	if (readcnt > 3) {
 		msg_pinfo("%s called with unsupported readcnt %i.\n",
 		       __func__, readcnt);
 		return SPI_INVALID_LENGTH;
 	}
 	switch (writecnt) {
 	case 1:
 		OUTB(writearr[0], it8716f_flashport + 1);
 		writeenc = 0x0;
 		break;
 	case 2:
 		OUTB(writearr[0], it8716f_flashport + 1);
 		OUTB(writearr[1], it8716f_flashport + 7);
 		writeenc = 0x1;
 		break;
 	case 4:
 		OUTB(writearr[0], it8716f_flashport + 1);
 		OUTB(writearr[1], it8716f_flashport + 4);
 		OUTB(writearr[2], it8716f_flashport + 3);
 		OUTB(writearr[3], it8716f_flashport + 2);
 		writeenc = 0x2;
 		break;
 	case 5:
 		OUTB(writearr[0], it8716f_flashport + 1);
 		OUTB(writearr[1], it8716f_flashport + 4);
 		OUTB(writearr[2], it8716f_flashport + 3);
 		OUTB(writearr[3], it8716f_flashport + 2);
 		OUTB(writearr[4], it8716f_flashport + 7);
 		writeenc = 0x3;
 		break;
 	default:
 		msg_pinfo("%s called with unsupported writecnt %i.\n",
 		       __func__, writecnt);
 		return SPI_INVALID_LENGTH;
 	}
 	/*
 	 * Start IO, 33 or 16 MHz, readcnt input bytes, writecnt output bytes.
 	 * Note:
 	 * We can't use writecnt directly, but have to use a strange encoding.
 	 */
 	OUTB(((0x4 + (fast_spi ? 1 : 0)) << 4)
 		| ((readcnt & 0x3) << 2) | (writeenc), it8716f_flashport);

 	if (readcnt > 0) {
 		do {
 			busy = INB(it8716f_flashport) & 0x80;
 		} while (busy);

 		for (i = 0; i < readcnt; i++)
 			readarr[i] = INB(it8716f_flashport + 5 + i);
 	}

 	return 0;
 }

 /* Page size is usually 256 bytes */
 static int it8716f_spi_page_program(struct flashchip *flash, uint8_t *buf, int start)
 {
 	int i;
 	int result;
 	chipaddr bios = flash->virtual_memory;

 	result = spi_write_enable();
 	if (result)
 		return result;
 	/* FIXME: The command below seems to be redundant or wrong. */
 	OUTB(0x06, it8716f_flashport + 1);
 	OUTB(((2 + (fast_spi ? 1 : 0)) << 4), it8716f_flashport);
 	for (i = 0; i < flash->page_size; i++) {
 		chip_writeb(buf[i], bios + start + i);
 	}
 	OUTB(0, it8716f_flashport);
 	/* Wait until the Write-In-Progress bit is cleared.
 	 * This usually takes 1-10 ms, so wait in 1 ms steps.
 	 */
 	while (spi_read_status_register() & JEDEC_RDSR_BIT_WIP)
 		programmer_delay(1000);
 	return 0;
 }

 /*
  * IT8716F only allows maximum of 512 kb SPI mapped to LPC memory cycles
  * Need to read this big flash using firmware cycles 3 byte at a time.
  */
 int it8716f_spi_chip_read(struct flashchip *flash, uint8_t *buf, int start, int len)
 {
 	int total_size = 1024 * flash->total_size;
 	fast_spi = 0;

 	if ((programmer == PROGRAMMER_IT87SPI) || (total_size > 512 * 1024)) {
 		spi_read_chunked(flash, buf, start, len, 3);
 	} else {
 		read_memmapped(flash, buf, start, len);
 	}

 	return 0;
 }

 int it8716f_spi_chip_write_256(struct flashchip *flash, uint8_t *buf, int start, int len)
 {
 	/*
 	 * IT8716F only allows maximum of 512 kb SPI chip size for memory
 	 * mapped access. It also can't write more than 1+3+256 bytes at once,
 	 * so page_size > 256 bytes needs a fallback.
 	 * FIXME: Split too big page writes into chunks IT87* can handle instead
 	 * of degrading to single-byte program.
 	 */
 	if ((programmer == PROGRAMMER_IT87SPI) ||
 	    (flash->total_size * 1024 > 512 * 1024) ||
 	    (flash->page_size > 256)) {
 		spi_chip_write_1(flash, buf, start, len);
 	} else {
 		int lenhere;

 		if (start % flash->page_size) {
 			/* start to the end of the page or to start + len,
 			 * whichever is smaller.
 			 */
 			lenhere = min(len, flash->page_size - start % flash->page_size);
 			spi_chip_write_1(flash, buf, start, lenhere);
 			start += lenhere;
 			len -= lenhere;
 			buf += lenhere;
 		}

 		while (len >= flash->page_size) {
 			it8716f_spi_page_program(flash, buf, start);
 			start += flash->page_size;
 			len -= flash->page_size;
 			buf += flash->page_size;
 		}
 		if (len)
 			spi_chip_write_1(flash, buf, start, len);
 	}

 	return 0;
 }

 #endif
	/*
	* This file is part of the flashrom project.
	*
	* Copyright (C) 2007, 2008, 2009 Carl-Daniel Hailfinger
	* Copyright (C) 2008 Ronald Hoogenboom <ronald@zonnet.nl>
	* 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 ITE IT87* SPI specific routines
	*/

	#if defined(__i386__) \|\| defined(__x86_64__)

	#include <string.h>
	#include <stdlib.h>
	#include "flash.h"
	#include "chipdrivers.h"
	#include "programmer.h"
	#include "spi.h"

	#define ITE_SUPERIO_PORT1 0x2e
	#define ITE_SUPERIO_PORT2 0x4e

	uint16_t it8716f_flashport = 0;
	/* use fast 33MHz SPI (<>0) or slow 16MHz (0) */
	static int fast_spi = 1;

	/* Helper functions for most recent ITE IT87xx Super I/O chips */
	#define CHIP_ID_BYTE1_REG 0x20
	#define CHIP_ID_BYTE2_REG 0x21
	void enter_conf_mode_ite(uint16_t port)
	{
	OUTB(0x87, port);
	OUTB(0x01, port);
	OUTB(0x55, port);
	if (port == ITE_SUPERIO_PORT1)
	OUTB(0x55, port);
	else
	OUTB(0xaa, port);
	}

	void exit_conf_mode_ite(uint16_t port)
	{
	sio_write(port, 0x02, 0x02);
	}

	uint16_t probe_id_ite(uint16_t port)
	{
	uint16_t id;

	enter_conf_mode_ite(port);
	id = sio_read(port, CHIP_ID_BYTE1_REG) << 8;
	id \|= sio_read(port, CHIP_ID_BYTE2_REG);
	exit_conf_mode_ite(port);

	return id;
	}

	struct superio probe_superio_ite(void)
	{
	struct superio ret = {};
	uint16_t ite_ports[] = {ITE_SUPERIO_PORT1, ITE_SUPERIO_PORT2, 0};
	uint16_t *i = ite_ports;

	ret.vendor = SUPERIO_VENDOR_ITE;
	for (; *i; i++) {
	ret.port = *i;
	ret.model = probe_id_ite(ret.port);
	switch (ret.model >> 8) {
	case 0x82:
	case 0x86:
	case 0x87:
	msg_pinfo("Found ITE Super I/O, ID 0x%04hx.\n",
	ret.model);
	return ret;
	}
	}

	/* No good ID found. */
	ret.vendor = SUPERIO_VENDOR_NONE;
	ret.port = 0;
	ret.model = 0;
	return ret;
	}

	static uint16_t it87spi_probe(uint16_t port)
	{
	uint8_t tmp = 0;
	char *portpos = NULL;
	uint16_t flashport = 0;

	enter_conf_mode_ite(port);
	/* NOLDN, reg 0x24, mask out lowest bit (suspend) */
	tmp = sio_read(port, 0x24) & 0xFE;
	/* If IT87SPI was not explicitly selected, we want to check
	* quickly if LPC->SPI translation is active.
	*/
	if ((programmer == PROGRAMMER_INTERNAL) && !(tmp & (0x0E))) {
	msg_pdbg("No IT87* serial flash segment enabled.\n");
	exit_conf_mode_ite(port);
	/* Nothing to do. */
	return 1;
	}
	msg_pdbg("Serial flash segment 0x%08x-0x%08x %sabled\n",
	0xFFFE0000, 0xFFFFFFFF, (tmp & 1 << 1) ? "en" : "dis");
	msg_pdbg("Serial flash segment 0x%08x-0x%08x %sabled\n",
	0x000E0000, 0x000FFFFF, (tmp & 1 << 1) ? "en" : "dis");
	msg_pdbg("Serial flash segment 0x%08x-0x%08x %sabled\n",
	0xFFEE0000, 0xFFEFFFFF, (tmp & 1 << 2) ? "en" : "dis");
	msg_pdbg("Serial flash segment 0x%08x-0x%08x %sabled\n",
	0xFFF80000, 0xFFFEFFFF, (tmp & 1 << 3) ? "en" : "dis");
	msg_pdbg("LPC write to serial flash %sabled\n",
	(tmp & 1 << 4) ? "en" : "dis");
	/* The LPC->SPI force write enable below only makes sense for
	* non-programmer mode.
	*/
	/* If any serial flash segment is enabled, enable writing. */
	if ((tmp & 0xe) && (!(tmp & 1 << 4))) {
	msg_pdbg("Enabling LPC write to serial flash\n");
	tmp \|= 1 << 4;
	sio_write(port, 0x24, tmp);
	}
	msg_pdbg("Serial flash pin %i\n", (tmp & 1 << 5) ? 87 : 29);
	/* LDN 0x7, reg 0x64/0x65 */
	sio_write(port, 0x07, 0x7);
	flashport = sio_read(port, 0x64) << 8;
	flashport \|= sio_read(port, 0x65);
	msg_pdbg("Serial flash port 0x%04x\n", flashport);
	/* Non-default port requested? */
	portpos = extract_programmer_param("it87spiport");
	if (portpos) {
	char *endptr = NULL;
	unsigned long forced_flashport;
	forced_flashport = strtoul(portpos, &endptr, 0);
	/* Port 0, port >0x1000, unaligned ports and garbage strings
	* are rejected.
	*/
	if (!forced_flashport \|\| (forced_flashport >= 0x1000) \|\|
	(forced_flashport & 0x7) \|\| (*endptr != '\0')) {
	/* Using ports below 0x100 is a really bad idea, and
	* should only be done if no port between 0x100 and
	* 0xff8 works due to routing issues.
	*/
	msg_perr("Error: it87spiport specified, but no valid "
	"port specified.\nPort must be a multiple of "
	"0x8 and lie between 0x100 and 0xff8.\n");
	free(portpos);
	/* FIXME: Return failure here once it87spi_common_init()
	* can handle the return value sanely.
	*/
	exit(1);
	} else {
	flashport = (uint16_t)forced_flashport;
	msg_pinfo("Forcing serial flash port 0x%04x\n",
	flashport);
	sio_write(port, 0x64, (flashport >> 8));
	sio_write(port, 0x65, (flashport & 0xff));
	}
	}
	free(portpos);
	exit_conf_mode_ite(port);
	it8716f_flashport = flashport;
	if (buses_supported & CHIP_BUSTYPE_SPI)
	msg_pdbg("Overriding chipset SPI with IT87 SPI.\n");
	spi_controller = SPI_CONTROLLER_IT87XX;
	buses_supported \|= CHIP_BUSTYPE_SPI;
	return 0;
	}

	int init_superio_ite(void)
	{
	if (superio.vendor != SUPERIO_VENDOR_ITE)
	return 1;

	switch (superio.model) {
	case 0x8705:
	return it8705f_write_enable(superio.port);
	break;
	case 0x8716:
	case 0x8718:
	case 0x8720:
	return it87spi_probe(superio.port);
	break;
	default:
	msg_pdbg("Super I/O ID 0x%04hx is not on the list of flash "
	"capable controllers.\n", superio.model);
	}
	return 1;
	}


	int it87spi_init(void)
	{
	int ret;

	get_io_perms();
	/* Probe for the Super I/O chip and fill global struct superio. */
	probe_superio();
	ret = init_superio_ite();
	if (!ret) {
	buses_supported = CHIP_BUSTYPE_SPI;
	} else {
	buses_supported = CHIP_BUSTYPE_NONE;
	}
	return ret;
	}

	/*
	* The IT8716F only supports commands with length 1,2,4,5 bytes including
	* command byte and can not read more than 3 bytes from the device.
	*
	* This function expects writearr[0] to be the first byte sent to the device,
	* whereas the IT8716F splits commands internally into address and non-address
	* commands with the address in inverse wire order. That's why the register
	* ordering in case 4 and 5 may seem strange.
	*/
	int it8716f_spi_send_command(unsigned int writecnt, unsigned int readcnt,
	const unsigned char writearr, unsigned char readarr)
	{
	uint8_t busy, writeenc;
	int i;

	do {
	busy = INB(it8716f_flashport) & 0x80;
	} while (busy);
	if (readcnt > 3) {
	msg_pinfo("%s called with unsupported readcnt %i.\n",
	__func__, readcnt);
	return SPI_INVALID_LENGTH;
	}
	switch (writecnt) {
	case 1:
	OUTB(writearr[0], it8716f_flashport + 1);
	writeenc = 0x0;
	break;
	case 2:
	OUTB(writearr[0], it8716f_flashport + 1);
	OUTB(writearr[1], it8716f_flashport + 7);
	writeenc = 0x1;
	break;
	case 4:
	OUTB(writearr[0], it8716f_flashport + 1);
	OUTB(writearr[1], it8716f_flashport + 4);
	OUTB(writearr[2], it8716f_flashport + 3);
	OUTB(writearr[3], it8716f_flashport + 2);
	writeenc = 0x2;
	break;
	case 5:
	OUTB(writearr[0], it8716f_flashport + 1);
	OUTB(writearr[1], it8716f_flashport + 4);
	OUTB(writearr[2], it8716f_flashport + 3);
	OUTB(writearr[3], it8716f_flashport + 2);
	OUTB(writearr[4], it8716f_flashport + 7);
	writeenc = 0x3;
	break;
	default:
	msg_pinfo("%s called with unsupported writecnt %i.\n",
	__func__, writecnt);
	return SPI_INVALID_LENGTH;
	}
	/*
	* Start IO, 33 or 16 MHz, readcnt input bytes, writecnt output bytes.
	* Note:
	* We can't use writecnt directly, but have to use a strange encoding.
	*/
	OUTB(((0x4 + (fast_spi ? 1 : 0)) << 4)
	\| ((readcnt & 0x3) << 2) \| (writeenc), it8716f_flashport);

	if (readcnt > 0) {
	do {
	busy = INB(it8716f_flashport) & 0x80;
	} while (busy);

	for (i = 0; i < readcnt; i++)
	readarr[i] = INB(it8716f_flashport + 5 + i);
	}

	return 0;
	}

	/* Page size is usually 256 bytes */
	static int it8716f_spi_page_program(struct flashchip flash, uint8_t buf, int start)
	{
	int i;
	int result;
	chipaddr bios = flash->virtual_memory;

	result = spi_write_enable();
	if (result)
	return result;
	/* FIXME: The command below seems to be redundant or wrong. */
	OUTB(0x06, it8716f_flashport + 1);
	OUTB(((2 + (fast_spi ? 1 : 0)) << 4), it8716f_flashport);
	for (i = 0; i < flash->page_size; i++) {
	chip_writeb(buf[i], bios + start + i);
	}
	OUTB(0, it8716f_flashport);
	/* Wait until the Write-In-Progress bit is cleared.
	* This usually takes 1-10 ms, so wait in 1 ms steps.
	*/
	while (spi_read_status_register() & JEDEC_RDSR_BIT_WIP)
	programmer_delay(1000);
	return 0;
	}

	/*
	* IT8716F only allows maximum of 512 kb SPI mapped to LPC memory cycles
	* Need to read this big flash using firmware cycles 3 byte at a time.
	*/
	int it8716f_spi_chip_read(struct flashchip flash, uint8_t buf, int start, int len)
	{
	int total_size = 1024 * flash->total_size;
	fast_spi = 0;

	if ((programmer == PROGRAMMER_IT87SPI) \|\| (total_size > 512 * 1024)) {
	spi_read_chunked(flash, buf, start, len, 3);
	} else {
	read_memmapped(flash, buf, start, len);
	}

	return 0;
	}

	int it8716f_spi_chip_write_256(struct flashchip flash, uint8_t buf, int start, int len)
	{
	/*
	* IT8716F only allows maximum of 512 kb SPI chip size for memory
	* mapped access. It also can't write more than 1+3+256 bytes at once,
	* so page_size > 256 bytes needs a fallback.
	* FIXME: Split too big page writes into chunks IT87* can handle instead
	* of degrading to single-byte program.
	*/
	if ((programmer == PROGRAMMER_IT87SPI) \|\|
	(flash->total_size * 1024 > 512 * 1024) \|\|
	(flash->page_size > 256)) {
	spi_chip_write_1(flash, buf, start, len);
	} else {
	int lenhere;

	if (start % flash->page_size) {
	/* start to the end of the page or to start + len,
	* whichever is smaller.
	*/
	lenhere = min(len, flash->page_size - start % flash->page_size);
	spi_chip_write_1(flash, buf, start, lenhere);
	start += lenhere;
	len -= lenhere;
	buf += lenhere;
	}

	while (len >= flash->page_size) {
	it8716f_spi_page_program(flash, buf, start);
	start += flash->page_size;
	len -= flash->page_size;
	buf += flash->page_size;
	}
	if (len)
	spi_chip_write_1(flash, buf, start, len);
	}

	return 0;
	}

	#endif