[people/ms/u-boot.git] / board / eltec / bab7xx / el_srom.c

/*
 * (C) Copyright 2002 ELTEC Elektronik AG
 * Frank Gottschling <fgottschling@eltec.de>
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * 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; either version 2 of
 * the License, or (at your option) any later version.
 *
 * 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., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <common.h>
#include "srom.h"

/*----------------------------------------------------------------------------*/
/*
 *  START sequence
 *        _ _________
 *  SCLK  _>         \____
 *        _ ____
 *  SDIO  _>    \_________
 *         :    :    :
 */
static void eepStart (void)
{
    out8(I2C_BUS_DAT, 0x60);     /* SCLK = high  SDIO = high */
    out8(I2C_BUS_DIR, 0x60);     /* set output direction for SCLK/SDIO */
    udelay(10);
    out8(I2C_BUS_DAT, 0x40);     /* SCLK = high  SDIO = low */
    udelay(10);
    out8(I2C_BUS_DAT, 0x00);     /* SCLK = low   SDIO = low */
    udelay(10);
}

/*----------------------------------------------------------------------------*/
/*
 *  STOP sequence
 *              _______
 *  SCLK  _____/
 *        _         ___
 *  SDIO  _>_______/
 *         :   :   :
 */
static void eepStop (void)
{
    out8(I2C_BUS_DAT, 0x00);      /* SCLK = low   SDIO = low */
    out8(I2C_BUS_DIR, 0x60);      /* set output direction for SCLK/SDIO */
    udelay(10);
    out8(I2C_BUS_DAT, 0x40);      /* SCLK = high  SDIO = low */
    udelay(10);
    out8(I2C_BUS_DAT, 0x60);      /* SCLK = high  SDIO = high */
    udelay(10);
    out8(I2C_BUS_DIR, 0x00);      /* reset to input direction */
}

/*----------------------------------------------------------------------------*/
/*
 *  Read one byte from EEPROM
 *            ___     ___     ___     ___     ___     ___     ___     ___
 *  SCLK  ___/   \___/   \___/   \___/   \___/   \___/   \___/   \___/   \
 *        _________________________________________________________________
 *  SDIO  >     ^       ^       ^       ^       ^       ^       ^       ^
 *        :  :   :   :   :   :   :   :   :   :   :   :   :   :   :   :   :
 */
static unsigned char eepReadByte (void)
{
    register unsigned char buf = 0x00;
    register int i;

    out8(I2C_BUS_DIR, 0x40);

    for (i = 0; i < 8; i++)
    {
	out8(I2C_BUS_DAT, 0x00);    /* SCLK = low   SDIO = high */
	udelay(10);
	out8(I2C_BUS_DAT, 0x40);    /* SCLK = high  SDIO = high */
	udelay(15);
	buf <<= 1;
	buf = (in8(I2C_BUS_DAT) & 0x20) ? (buf | 0x01) : (buf & 0xFE);
	out8(I2C_BUS_DAT, 0x00);    /* SCLK = low   SDIO = high */
	udelay(10);
    }
    return(buf);
}

/*----------------------------------------------------------------------------*/
/*
 *  Write one byte to EEPROM
 *           ___     ___     ___     ___     ___     ___     ___     ___
 *  SCLK  __/   \___/   \___/   \___/   \___/   \___/   \___/   \___/   \__
 *         _______ _______ _______ _______ _______ _______ _______ ________
 *  SDIO  X_______X_______X_______X_______X_______X_______X_______X________
 *      :   7   :   6   :   5   :   4   :   3   :   2   :   1   :   0
 */
static void eepWriteByte (register unsigned char buf)
{
    register int    i;

    (buf & 0x80) ? out8(I2C_BUS_DAT, 0x20) : out8(I2C_BUS_DAT, 0x00);     /* SCLK = low   SDIO = data */
    out8(I2C_BUS_DIR, 0x60);

    for (i = 7; i >= 0; i--)
    {
	(buf & 0x80) ? out8(I2C_BUS_DAT, 0x20) : out8(I2C_BUS_DAT, 0x00); /* SCLK=low  SDIO=data */
	udelay(10);
	(buf & 0x80) ? out8(I2C_BUS_DAT, 0x60) : out8(I2C_BUS_DAT, 0x40); /* SCLK=high SDIO=data */
	udelay(15);
	(buf & 0x80) ? out8(I2C_BUS_DAT, 0x20) : out8(I2C_BUS_DAT, 0x00); /* SCLK=low  SDIO=data */
	udelay(10);
	buf <<= 1;
    }
}

/*----------------------------------------------------------------------------*/
/*
 *  Read data acknowledge of EEPROM
 *             _______
 *  SCLK  ____/       \___
 *         _______________
 *  SDIO  >
 *        :   :   ^   :
 */
static int eepReadAck (void)
{
    int retval;

    out8(I2C_BUS_DIR, 0x40);
    out8(I2C_BUS_DAT, 0x00);            /* SCLK = low   SDIO = high */
    udelay(10);
    out8(I2C_BUS_DAT, 0x40);            /* SCLK = high  SDIO = high */
    udelay(10);
    retval = (in8(I2C_BUS_DAT) & 0x20) ? ERROR : 0;
    udelay(10);
    out8(I2C_BUS_DAT, 0x00);            /* SCLK = low   SDIO = high */
    udelay(10);

    return(retval);
}

/*----------------------------------------------------------------------------*/
/*
 *  Write data acknowledge to EEPROM
 *             _______
 *  SCLK  ____/       \___
 *
 *  SDIO  >_______________
 *        :   :       :
 */
static void eepWriteAck (unsigned char ack)
{
    ack ? out8(I2C_BUS_DAT, 0x20) : out8(I2C_BUS_DAT, 0x00); /* SCLK = low   SDIO = ack */
    out8(I2C_BUS_DIR, 0x60);
    udelay(10);
    ack ? out8(I2C_BUS_DAT, 0x60) : out8(I2C_BUS_DAT, 0x40); /* SCLK = high  SDIO = ack */
    udelay(15);
    ack ? out8(I2C_BUS_DAT, 0x20) : out8(I2C_BUS_DAT, 0x00); /* SCLK = low   SDIO = ack */
    udelay(10);
}

/*----------------------------------------------------------------------------*/
/*
 * Read bytes from EEPROM
 */
int el_srom_load (addr, buf, cnt, device, block)
unsigned char addr;
unsigned char *buf;
int cnt;
unsigned char device;
unsigned char block;
{
    register int i;

    for (i=0;i<cnt;i++)
    {
	eepStart();
	eepWriteByte(0xA0 | device | block);
	if (eepReadAck() == ERROR)
	{
	   eepStop();
	    return(ERROR);
	}
	eepWriteByte(addr++);
	if (eepReadAck() == ERROR)
	{
	    eepStop();
	    return(ERROR);
	}
	eepStart();

	eepWriteByte(0xA1 | device | block);
	if (eepReadAck() == ERROR)
	{
	    eepStop();
	    return(ERROR);
	}

	*buf++ = eepReadByte();
	eepWriteAck(1);
	eepStop();

	if ((addr == 0) && (i != (cnt-1)))    /* is it the same block ? */
	{
	    if (block == FIRST_BLOCK)
		block = SECOND_BLOCK;
	    else
		return(ERROR);
	}
    }
    return(cnt);
}

/*----------------------------------------------------------------------------*/
/*
 *
 * Write bytes to EEPROM
 *
 */
int el_srom_store (addr, buf, cnt, device, block)
unsigned char    addr, *buf, device, block;
int        cnt;
{
    register int i, retVal;

    for (i=0;i<cnt;i++)
    {
	retVal = ERROR;
	do
	{
	    eepStart();
	    eepWriteByte(0xA0 | device | block);
	    if ((retVal = eepReadAck()) == ERROR)
		eepStop();
	} while (retVal == ERROR);

	eepWriteByte(addr++);
	if (eepReadAck() == ERROR)  return(ERROR);

	if ((addr == 0) && (i != (cnt-1)))    /* is it the same block ? */
	{
	    if (block == FIRST_BLOCK)
		block = SECOND_BLOCK;
	    else
	    return(ERROR);
	}

	eepWriteByte(*buf++);
	if (eepReadAck() == ERROR)
	    return(ERROR);

	eepStop();
    }
    return(cnt);
}

/*----------------------------------------------------------------------------*/
/*
 * calculate checksum for ELTEC revision srom
 */
unsigned long el_srom_checksum (ptr, size)
register unsigned char *ptr;
unsigned long size;
{
    u_long f, accu = 0;
    u_int  i;
    u_char byte;

    for (; size; size--)
    {
	byte = *ptr++;
	for (i = 8; i; i--)
	{
	    f =  ((byte & 1) ^ (accu & 1)) ? 0x84083001 : 0;
	    accu >>= 1; accu ^= f;
	    byte >>= 1;
	}
    }
    return(accu);
}

/*----------------------------------------------------------------------------*/
Commit	Line	Data
c609719b WD	1	/*
	2	* (C) Copyright 2002 ELTEC Elektronik AG
	3	* Frank Gottschling <fgottschling@eltec.de>
	4	*
	5	* See file CREDITS for list of people who contributed to this
	6	* project.
	7	*
	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License as
	10	* published by the Free Software Foundation; either version 2 of
	11	* the License, or (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
	21	* MA 02111-1307 USA
	22	*/
	23
	24	#include <common.h>
	25	#include "srom.h"
	26
	27	/----------------------------------------------------------------------------/
	28	/*
	29	* START sequence
	30	* _ _________
	31	* SCLK _> \____
	32	* _ ____
	33	* SDIO _> \_________
	34	* : : :
	35	*/
	36	static void eepStart (void)
	37	{
	38	out8(I2C_BUS_DAT, 0x60); /* SCLK = high SDIO = high */
	39	out8(I2C_BUS_DIR, 0x60); /* set output direction for SCLK/SDIO */
	40	udelay(10);
	41	out8(I2C_BUS_DAT, 0x40); /* SCLK = high SDIO = low */
	42	udelay(10);
	43	out8(I2C_BUS_DAT, 0x00); /* SCLK = low SDIO = low */
	44	udelay(10);
	45	}
	46
	47	/----------------------------------------------------------------------------/
	48	/*
	49	* STOP sequence
	50	* _______
	51	* SCLK _____/
	52	* _ ___
	53	* SDIO _>_______/
	54	* : : :
	55	*/
	56	static void eepStop (void)
	57	{
	58	out8(I2C_BUS_DAT, 0x00); /* SCLK = low SDIO = low */
	59	out8(I2C_BUS_DIR, 0x60); /* set output direction for SCLK/SDIO */
	60	udelay(10);
	61	out8(I2C_BUS_DAT, 0x40); /* SCLK = high SDIO = low */
	62	udelay(10);
	63	out8(I2C_BUS_DAT, 0x60); /* SCLK = high SDIO = high */
	64	udelay(10);
65	out8(I2C_BUS_DIR, 0x00); /* reset to input direction */
66	}
67
68	/----------------------------------------------------------------------------/
69	/*
70	* Read one byte from EEPROM
71	* ___ ___ ___ ___ ___ ___ ___ ___
72	* SCLK ___/ \___/ \___/ \___/ \___/ \___/ \___/ \___/ \
73	* _________________________________________________________________
74	* SDIO > ^ ^ ^ ^ ^ ^ ^ ^
75	* : : : : : : : : : : : : : : : : :
76	*/
77	static unsigned char eepReadByte (void)
78	{
79	register unsigned char buf = 0x00;
80	register int i;
81
82	out8(I2C_BUS_DIR, 0x40);
83
84	for (i = 0; i < 8; i++)
85	{
8bde7f77 WD	86	out8(I2C_BUS_DAT, 0x00); /* SCLK = low SDIO = high */
	87	udelay(10);
	88	out8(I2C_BUS_DAT, 0x40); /* SCLK = high SDIO = high */
	89	udelay(15);
	90	buf <<= 1;
	91	buf = (in8(I2C_BUS_DAT) & 0x20) ? (buf \| 0x01) : (buf & 0xFE);
	92	out8(I2C_BUS_DAT, 0x00); /* SCLK = low SDIO = high */
	93	udelay(10);
c609719b WD	94	}
	95	return(buf);
	96	}
	97
	98	/----------------------------------------------------------------------------/
	99	/*
	100	* Write one byte to EEPROM
	101	* ___ ___ ___ ___ ___ ___ ___ ___
	102	* SCLK __/ \___/ \___/ \___/ \___/ \___/ \___/ \___/ \__
	103	* _______ _______ _______ _______ _______ _______ _______ ________
	104	* SDIO X_______X_______X_______X_______X_______X_______X_______X________
	105	* : 7 : 6 : 5 : 4 : 3 : 2 : 1 : 0
	106	*/
	107	static void eepWriteByte (register unsigned char buf)
	108	{
	109	register int i;
	110
	111	(buf & 0x80) ? out8(I2C_BUS_DAT, 0x20) : out8(I2C_BUS_DAT, 0x00); /* SCLK = low SDIO = data */
	112	out8(I2C_BUS_DIR, 0x60);
	113
	114	for (i = 7; i >= 0; i--)
	115	{
8bde7f77 WD	116	(buf & 0x80) ? out8(I2C_BUS_DAT, 0x20) : out8(I2C_BUS_DAT, 0x00); /* SCLK=low SDIO=data */
	117	udelay(10);
	118	(buf & 0x80) ? out8(I2C_BUS_DAT, 0x60) : out8(I2C_BUS_DAT, 0x40); /* SCLK=high SDIO=data */
	119	udelay(15);
	120	(buf & 0x80) ? out8(I2C_BUS_DAT, 0x20) : out8(I2C_BUS_DAT, 0x00); /* SCLK=low SDIO=data */
	121	udelay(10);
	122	buf <<= 1;
c609719b WD	123	}
	124	}
	125
	126	/----------------------------------------------------------------------------/
	127	/*
	128	* Read data acknowledge of EEPROM
	129	* _______
	130	* SCLK ____/ \___
	131	* _______________
	132	* SDIO >
	133	* : : ^ :
	134	*/
	135	static int eepReadAck (void)
	136	{
	137	int retval;
	138
	139	out8(I2C_BUS_DIR, 0x40);
	140	out8(I2C_BUS_DAT, 0x00); /* SCLK = low SDIO = high */
	141	udelay(10);
	142	out8(I2C_BUS_DAT, 0x40); /* SCLK = high SDIO = high */
	143	udelay(10);
	144	retval = (in8(I2C_BUS_DAT) & 0x20) ? ERROR : 0;
	145	udelay(10);
	146	out8(I2C_BUS_DAT, 0x00); /* SCLK = low SDIO = high */
	147	udelay(10);
	148
	149	return(retval);
	150	}
	151
	152	/----------------------------------------------------------------------------/
	153	/*
	154	* Write data acknowledge to EEPROM
	155	* _______
	156	* SCLK ____/ \___
	157	*
	158	* SDIO >_______________
	159	* : : :
	160	*/
	161	static void eepWriteAck (unsigned char ack)
	162	{
	163	ack ? out8(I2C_BUS_DAT, 0x20) : out8(I2C_BUS_DAT, 0x00); /* SCLK = low SDIO = ack */
	164	out8(I2C_BUS_DIR, 0x60);
	165	udelay(10);
	166	ack ? out8(I2C_BUS_DAT, 0x60) : out8(I2C_BUS_DAT, 0x40); /* SCLK = high SDIO = ack */
	167	udelay(15);
	168	ack ? out8(I2C_BUS_DAT, 0x20) : out8(I2C_BUS_DAT, 0x00); /* SCLK = low SDIO = ack */
	169	udelay(10);
	170	}
	171
	172	/----------------------------------------------------------------------------/
	173	/*
	174	* Read bytes from EEPROM
	175	*/
	176	int el_srom_load (addr, buf, cnt, device, block)
	177	unsigned char addr;
	178	unsigned char *buf;
	179	int cnt;
	180	unsigned char device;
	181	unsigned char block;
	182	{
	183	register int i;
	184
	185	for (i=0;i<cnt;i++)
	186	{
8bde7f77 WD	187	eepStart();
	188	eepWriteByte(0xA0 \| device \| block);
	189	if (eepReadAck() == ERROR)
	190	{
	191	eepStop();
	192	return(ERROR);
	193	}
	194	eepWriteByte(addr++);
	195	if (eepReadAck() == ERROR)
	196	{
	197	eepStop();
	198	return(ERROR);
	199	}
	200	eepStart();
c609719b	201
8bde7f77 WD	202	eepWriteByte(0xA1 \| device \| block);
	203	if (eepReadAck() == ERROR)
	204	{
	205	eepStop();
	206	return(ERROR);
	207	}
c609719b	208
8bde7f77 WD	209	*buf++ = eepReadByte();
	210	eepWriteAck(1);
	211	eepStop();
c609719b	212
8bde7f77 WD	213	if ((addr == 0) && (i != (cnt-1))) /* is it the same block ? */
	214	{
	215	if (block == FIRST_BLOCK)
	216	block = SECOND_BLOCK;
	217	else
	218	return(ERROR);
	219	}
c609719b WD	220	}
	221	return(cnt);
	222	}
	223
	224	/----------------------------------------------------------------------------/
	225	/*
	226	*
	227	* Write bytes to EEPROM
	228	*
	229	*/
	230	int el_srom_store (addr, buf, cnt, device, block)
	231	unsigned char addr, *buf, device, block;
	232	int cnt;
	233	{
	234	register int i, retVal;
	235
	236	for (i=0;i<cnt;i++)
	237	{
8bde7f77 WD	238	retVal = ERROR;
	239	do
	240	{
	241	eepStart();
	242	eepWriteByte(0xA0 \| device \| block);
	243	if ((retVal = eepReadAck()) == ERROR)
	244	eepStop();
	245	} while (retVal == ERROR);
c609719b	246
8bde7f77 WD	247	eepWriteByte(addr++);
8bde7f77 WD	248	if (eepReadAck() == ERROR) return(ERROR);
c609719b	249
8bde7f77 WD	250	if ((addr == 0) && (i != (cnt-1))) /* is it the same block ? */
	251	{
	252	if (block == FIRST_BLOCK)
	253	block = SECOND_BLOCK;
	254	else
	255	return(ERROR);
	256	}
c609719b	257
8bde7f77 WD	258	eepWriteByte(*buf++);
	259	if (eepReadAck() == ERROR)
	260	return(ERROR);
c609719b	261
8bde7f77	262	eepStop();
c609719b WD	263	}
	264	return(cnt);
	265	}
	266
	267	/----------------------------------------------------------------------------/
	268	/*
	269	* calculate checksum for ELTEC revision srom
	270	*/
	271	unsigned long el_srom_checksum (ptr, size)
	272	register unsigned char *ptr;
	273	unsigned long size;
	274	{
	275	u_long f, accu = 0;
	276	u_int i;
	277	u_char byte;
	278
	279	for (; size; size--)
	280	{
8bde7f77 WD	281	byte = *ptr++;
	282	for (i = 8; i; i--)
	283	{
	284	f = ((byte & 1) ^ (accu & 1)) ? 0x84083001 : 0;
	285	accu >>= 1; accu ^= f;
	286	byte >>= 1;
	287	}
c609719b WD	288	}
	289	return(accu);
	290	}
	291
	292	/----------------------------------------------------------------------------/