441 lines
12 KiB
C
441 lines
12 KiB
C
/*
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* (C) Copyright 2000, 2001
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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*/
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/*
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* Support for read and write access to EEPROM like memory devices. This
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* includes regular EEPROM as well as FRAM (ferroelectic nonvolaile RAM).
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* FRAM devices read and write data at bus speed. In particular, there is no
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* write delay. Also, there is no limit imposed on the numer of bytes that can
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* be transferred with a single read or write.
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*
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* Use the following configuration options to ensure no unneeded performance
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* degradation (typical for EEPROM) is incured for FRAM memory:
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*
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* #define CONFIG_SYS_I2C_FRAM
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* #undef CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS
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*
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*/
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#include <common.h>
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#include <config.h>
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#include <command.h>
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#include <i2c.h>
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extern void eeprom_init (void);
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extern int eeprom_read (unsigned dev_addr, unsigned offset,
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uchar *buffer, unsigned cnt);
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extern int eeprom_write (unsigned dev_addr, unsigned offset,
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uchar *buffer, unsigned cnt);
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#if defined(CONFIG_SYS_EEPROM_WREN)
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extern int eeprom_write_enable (unsigned dev_addr, int state);
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#endif
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#if defined(CONFIG_SYS_EEPROM_X40430)
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/* Maximum number of times to poll for acknowledge after write */
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#define MAX_ACKNOWLEDGE_POLLS 10
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#endif
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/* ------------------------------------------------------------------------- */
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#if defined(CONFIG_CMD_EEPROM)
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int do_eeprom ( cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
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{
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const char *const fmt =
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"\nEEPROM @0x%lX %s: addr %08lx off %04lx count %ld ... ";
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#if defined(CONFIG_SYS_I2C_MULTI_EEPROMS)
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if (argc == 6) {
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ulong dev_addr = simple_strtoul (argv[2], NULL, 16);
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ulong addr = simple_strtoul (argv[3], NULL, 16);
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ulong off = simple_strtoul (argv[4], NULL, 16);
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ulong cnt = simple_strtoul (argv[5], NULL, 16);
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#else
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if (argc == 5) {
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ulong dev_addr = CONFIG_SYS_DEF_EEPROM_ADDR;
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ulong addr = simple_strtoul (argv[2], NULL, 16);
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ulong off = simple_strtoul (argv[3], NULL, 16);
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ulong cnt = simple_strtoul (argv[4], NULL, 16);
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#endif /* CONFIG_SYS_I2C_MULTI_EEPROMS */
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# if !defined(CONFIG_SPI) || defined(CONFIG_ENV_EEPROM_IS_ON_I2C)
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eeprom_init ();
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# endif /* !CONFIG_SPI */
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if (strcmp (argv[1], "read") == 0) {
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int rcode;
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printf (fmt, dev_addr, argv[1], addr, off, cnt);
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rcode = eeprom_read (dev_addr, off, (uchar *) addr, cnt);
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puts ("done\n");
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return rcode;
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} else if (strcmp (argv[1], "write") == 0) {
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int rcode;
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printf (fmt, dev_addr, argv[1], addr, off, cnt);
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rcode = eeprom_write (dev_addr, off, (uchar *) addr, cnt);
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puts ("done\n");
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return rcode;
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}
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}
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return cmd_usage(cmdtp);
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}
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#endif
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/*-----------------------------------------------------------------------
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*
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* for CONFIG_SYS_I2C_EEPROM_ADDR_LEN == 2 (16-bit EEPROM address) offset is
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* 0x000nxxxx for EEPROM address selectors at n, offset xxxx in EEPROM.
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*
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* for CONFIG_SYS_I2C_EEPROM_ADDR_LEN == 1 (8-bit EEPROM page address) offset is
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* 0x00000nxx for EEPROM address selectors and page number at n.
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*/
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#if !defined(CONFIG_SPI) || defined(CONFIG_ENV_EEPROM_IS_ON_I2C)
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#if !defined(CONFIG_SYS_I2C_EEPROM_ADDR_LEN) || CONFIG_SYS_I2C_EEPROM_ADDR_LEN < 1 || CONFIG_SYS_I2C_EEPROM_ADDR_LEN > 2
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#error CONFIG_SYS_I2C_EEPROM_ADDR_LEN must be 1 or 2
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#endif
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#endif
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int eeprom_read (unsigned dev_addr, unsigned offset, uchar *buffer, unsigned cnt)
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{
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unsigned end = offset + cnt;
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unsigned blk_off;
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int rcode = 0;
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/* Read data until done or would cross a page boundary.
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* We must write the address again when changing pages
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* because the next page may be in a different device.
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*/
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while (offset < end) {
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unsigned alen, len;
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#if !defined(CONFIG_SYS_I2C_FRAM)
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unsigned maxlen;
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#endif
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#if CONFIG_SYS_I2C_EEPROM_ADDR_LEN == 1 && !defined(CONFIG_SPI_X)
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uchar addr[2];
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blk_off = offset & 0xFF; /* block offset */
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addr[0] = offset >> 8; /* block number */
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addr[1] = blk_off; /* block offset */
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alen = 2;
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#else
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uchar addr[3];
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blk_off = offset & 0xFF; /* block offset */
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addr[0] = offset >> 16; /* block number */
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addr[1] = offset >> 8; /* upper address octet */
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addr[2] = blk_off; /* lower address octet */
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alen = 3;
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#endif /* CONFIG_SYS_I2C_EEPROM_ADDR_LEN, CONFIG_SPI_X */
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addr[0] |= dev_addr; /* insert device address */
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len = end - offset;
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/*
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* For a FRAM device there is no limit on the number of the
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* bytes that can be ccessed with the single read or write
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* operation.
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*/
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#if !defined(CONFIG_SYS_I2C_FRAM)
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maxlen = 0x100 - blk_off;
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if (maxlen > I2C_RXTX_LEN)
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maxlen = I2C_RXTX_LEN;
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if (len > maxlen)
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len = maxlen;
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#endif
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#if defined(CONFIG_SPI) && !defined(CONFIG_ENV_EEPROM_IS_ON_I2C)
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spi_read (addr, alen, buffer, len);
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#else
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if (i2c_read (addr[0], offset, alen-1, buffer, len) != 0)
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rcode = 1;
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#endif
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buffer += len;
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offset += len;
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}
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return rcode;
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}
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/*-----------------------------------------------------------------------
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*
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* for CONFIG_SYS_I2C_EEPROM_ADDR_LEN == 2 (16-bit EEPROM address) offset is
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* 0x000nxxxx for EEPROM address selectors at n, offset xxxx in EEPROM.
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*
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* for CONFIG_SYS_I2C_EEPROM_ADDR_LEN == 1 (8-bit EEPROM page address) offset is
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* 0x00000nxx for EEPROM address selectors and page number at n.
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*/
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int eeprom_write (unsigned dev_addr, unsigned offset, uchar *buffer, unsigned cnt)
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{
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unsigned end = offset + cnt;
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unsigned blk_off;
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int rcode = 0;
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#if defined(CONFIG_SYS_EEPROM_X40430)
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uchar contr_r_addr[2];
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uchar addr_void[2];
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uchar contr_reg[2];
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uchar ctrl_reg_v;
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int i;
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#endif
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#if defined(CONFIG_SYS_EEPROM_WREN)
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eeprom_write_enable (dev_addr,1);
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#endif
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/* Write data until done or would cross a write page boundary.
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* We must write the address again when changing pages
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* because the address counter only increments within a page.
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*/
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while (offset < end) {
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unsigned alen, len;
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#if !defined(CONFIG_SYS_I2C_FRAM)
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unsigned maxlen;
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#endif
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#if CONFIG_SYS_I2C_EEPROM_ADDR_LEN == 1 && !defined(CONFIG_SPI_X)
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uchar addr[2];
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blk_off = offset & 0xFF; /* block offset */
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addr[0] = offset >> 8; /* block number */
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addr[1] = blk_off; /* block offset */
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alen = 2;
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#else
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uchar addr[3];
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blk_off = offset & 0xFF; /* block offset */
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addr[0] = offset >> 16; /* block number */
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addr[1] = offset >> 8; /* upper address octet */
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addr[2] = blk_off; /* lower address octet */
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alen = 3;
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#endif /* CONFIG_SYS_I2C_EEPROM_ADDR_LEN, CONFIG_SPI_X */
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addr[0] |= dev_addr; /* insert device address */
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len = end - offset;
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/*
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* For a FRAM device there is no limit on the number of the
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* bytes that can be ccessed with the single read or write
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* operation.
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*/
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#if !defined(CONFIG_SYS_I2C_FRAM)
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#if defined(CONFIG_SYS_EEPROM_PAGE_WRITE_BITS)
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#define EEPROM_PAGE_SIZE (1 << CONFIG_SYS_EEPROM_PAGE_WRITE_BITS)
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#define EEPROM_PAGE_OFFSET(x) ((x) & (EEPROM_PAGE_SIZE - 1))
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maxlen = EEPROM_PAGE_SIZE - EEPROM_PAGE_OFFSET(blk_off);
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#else
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maxlen = 0x100 - blk_off;
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#endif
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if (maxlen > I2C_RXTX_LEN)
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maxlen = I2C_RXTX_LEN;
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if (len > maxlen)
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len = maxlen;
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#endif
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#if defined(CONFIG_SPI) && !defined(CONFIG_ENV_EEPROM_IS_ON_I2C)
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spi_write (addr, alen, buffer, len);
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#else
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#if defined(CONFIG_SYS_EEPROM_X40430)
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/* Get the value of the control register.
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* Set current address (internal pointer in the x40430)
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* to 0x1ff.
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*/
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contr_r_addr[0] = 9;
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contr_r_addr[1] = 0xff;
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addr_void[0] = 0;
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addr_void[1] = addr[1];
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#ifdef CONFIG_SYS_I2C_EEPROM_ADDR
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contr_r_addr[0] |= CONFIG_SYS_I2C_EEPROM_ADDR;
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addr_void[0] |= CONFIG_SYS_I2C_EEPROM_ADDR;
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#endif
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contr_reg[0] = 0xff;
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if (i2c_read (contr_r_addr[0], contr_r_addr[1], 1, contr_reg, 1) != 0) {
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rcode = 1;
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}
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ctrl_reg_v = contr_reg[0];
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/* Are any of the eeprom blocks write protected?
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*/
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if (ctrl_reg_v & 0x18) {
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ctrl_reg_v &= ~0x18; /* reset block protect bits */
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ctrl_reg_v |= 0x02; /* set write enable latch */
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ctrl_reg_v &= ~0x04; /* clear RWEL */
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/* Set write enable latch.
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*/
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contr_reg[0] = 0x02;
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if (i2c_write (contr_r_addr[0], 0xff, 1, contr_reg, 1) != 0) {
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rcode = 1;
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}
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/* Set register write enable latch.
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*/
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contr_reg[0] = 0x06;
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if (i2c_write (contr_r_addr[0], 0xFF, 1, contr_reg, 1) != 0) {
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rcode = 1;
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}
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/* Modify ctrl register.
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*/
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contr_reg[0] = ctrl_reg_v;
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if (i2c_write (contr_r_addr[0], 0xFF, 1, contr_reg, 1) != 0) {
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rcode = 1;
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}
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/* The write (above) is an operation on NV memory.
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* These can take some time (~5ms), and the device
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* will not respond to further I2C messages till
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* it's completed the write.
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* So poll device for an I2C acknowledge.
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* When we get one we know we can continue with other
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* operations.
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*/
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contr_reg[0] = 0;
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for (i = 0; i < MAX_ACKNOWLEDGE_POLLS; i++) {
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if (i2c_read (addr_void[0], addr_void[1], 1, contr_reg, 1) == 0)
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break; /* got ack */
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#if defined(CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS)
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udelay(CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS * 1000);
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#endif
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}
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if (i == MAX_ACKNOWLEDGE_POLLS) {
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puts ("EEPROM poll acknowledge failed\n");
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rcode = 1;
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}
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}
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/* Is the write enable latch on?.
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*/
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else if (!(ctrl_reg_v & 0x02)) {
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/* Set write enable latch.
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*/
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contr_reg[0] = 0x02;
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if (i2c_write (contr_r_addr[0], 0xFF, 1, contr_reg, 1) != 0) {
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rcode = 1;
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}
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}
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/* Write is enabled ... now write eeprom value.
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*/
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#endif
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if (i2c_write (addr[0], offset, alen-1, buffer, len) != 0)
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rcode = 1;
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#endif
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buffer += len;
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offset += len;
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#if defined(CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS)
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udelay(CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS * 1000);
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#endif
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}
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#if defined(CONFIG_SYS_EEPROM_WREN)
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eeprom_write_enable (dev_addr,0);
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#endif
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return rcode;
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}
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#if !defined(CONFIG_SPI) || defined(CONFIG_ENV_EEPROM_IS_ON_I2C)
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int
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eeprom_probe (unsigned dev_addr, unsigned offset)
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{
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unsigned char chip;
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/* Probe the chip address
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*/
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#if CONFIG_SYS_I2C_EEPROM_ADDR_LEN == 1 && !defined(CONFIG_SPI_X)
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chip = offset >> 8; /* block number */
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#else
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chip = offset >> 16; /* block number */
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#endif /* CONFIG_SYS_I2C_EEPROM_ADDR_LEN, CONFIG_SPI_X */
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chip |= dev_addr; /* insert device address */
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return (i2c_probe (chip));
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}
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#endif
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/*-----------------------------------------------------------------------
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* Set default values
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*/
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#ifndef CONFIG_SYS_I2C_SPEED
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#define CONFIG_SYS_I2C_SPEED 50000
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#endif
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void eeprom_init (void)
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{
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#if defined(CONFIG_SPI) && !defined(CONFIG_ENV_EEPROM_IS_ON_I2C)
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spi_init_f ();
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#endif
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#if defined(CONFIG_HARD_I2C) || \
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defined(CONFIG_SOFT_I2C)
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i2c_init (CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
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#endif
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}
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/*-----------------------------------------------------------------------
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*/
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/***************************************************/
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#if defined(CONFIG_CMD_EEPROM)
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#ifdef CONFIG_SYS_I2C_MULTI_EEPROMS
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U_BOOT_CMD(
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eeprom, 6, 1, do_eeprom,
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"EEPROM sub-system",
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"read devaddr addr off cnt\n"
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"eeprom write devaddr addr off cnt\n"
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" - read/write `cnt' bytes from `devaddr` EEPROM at offset `off'"
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);
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#else /* One EEPROM */
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U_BOOT_CMD(
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eeprom, 5, 1, do_eeprom,
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"EEPROM sub-system",
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"read addr off cnt\n"
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"eeprom write addr off cnt\n"
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" - read/write `cnt' bytes at EEPROM offset `off'"
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);
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#endif /* CONFIG_SYS_I2C_MULTI_EEPROMS */
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#endif
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