@ -95,6 +95,29 @@ static int eeprom_addr(unsigned dev_addr, unsigned offset, uchar *addr)
return alen ;
}
static int eeprom_len ( unsigned offset , unsigned end )
{
unsigned len = end - offset ;
/*
* For a FRAM device there is no limit on the number of the
* bytes that can be ccessed with the single read or write
* operation .
*/
# if !defined(CONFIG_SYS_I2C_FRAM)
unsigned blk_off = offset & 0xff ;
unsigned maxlen = EEPROM_PAGE_SIZE - EEPROM_PAGE_OFFSET ( blk_off ) ;
if ( maxlen > I2C_RXTX_LEN )
maxlen = I2C_RXTX_LEN ;
if ( len > maxlen )
len = maxlen ;
# endif
return len ;
}
static int eeprom_rw_block ( unsigned offset , uchar * addr , unsigned alen ,
uchar * buffer , unsigned len , bool read )
{
@ -126,7 +149,6 @@ static int eeprom_rw_block(unsigned offset, uchar *addr, unsigned alen,
int eeprom_read ( unsigned dev_addr , unsigned offset , uchar * buffer , unsigned cnt )
{
unsigned end = offset + cnt ;
unsigned blk_off ;
int rcode = 0 ;
uchar addr [ 3 ] ;
@ -137,27 +159,10 @@ int eeprom_read (unsigned dev_addr, unsigned offset, uchar *buffer, unsigned cnt
*/
while ( offset < end ) {
unsigned alen , len ;
# if !defined(CONFIG_SYS_I2C_FRAM)
unsigned maxlen ;
# endif
blk_off = offset & 0xFF ; /* block offset */
alen = eeprom_addr ( dev_addr , offset , addr ) ;
len = end - offset ;
/*
* For a FRAM device there is no limit on the number of the
* bytes that can be ccessed with the single read or write
* operation .
*/
# if !defined(CONFIG_SYS_I2C_FRAM)
maxlen = 0x100 - blk_off ;
if ( maxlen > I2C_RXTX_LEN )
maxlen = I2C_RXTX_LEN ;
if ( len > maxlen )
len = maxlen ;
# endif
len = eeprom_len ( offset , end ) ;
rcode = eeprom_rw_block ( offset , addr , alen , buffer , len , 1 ) ;
@ -171,7 +176,6 @@ int eeprom_read (unsigned dev_addr, unsigned offset, uchar *buffer, unsigned cnt
int eeprom_write ( unsigned dev_addr , unsigned offset , uchar * buffer , unsigned cnt )
{
unsigned end = offset + cnt ;
unsigned blk_off ;
int rcode = 0 ;
uchar addr [ 3 ] ;
@ -185,30 +189,10 @@ int eeprom_write (unsigned dev_addr, unsigned offset, uchar *buffer, unsigned cn
while ( offset < end ) {
unsigned alen , len ;
# if !defined(CONFIG_SYS_I2C_FRAM)
unsigned maxlen ;
# endif
blk_off = offset & 0xFF ; /* block offset */
alen = eeprom_addr ( dev_addr , offset , addr ) ;
len = end - offset ;
/*
* For a FRAM device there is no limit on the number of the
* bytes that can be accessed with the single read or write
* operation .
*/
# if !defined(CONFIG_SYS_I2C_FRAM)
maxlen = EEPROM_PAGE_SIZE - EEPROM_PAGE_OFFSET ( blk_off ) ;
if ( maxlen > I2C_RXTX_LEN )
maxlen = I2C_RXTX_LEN ;
if ( len > maxlen )
len = maxlen ;
# endif
len = eeprom_len ( offset , end ) ;
rcode = eeprom_rw_block ( offset , addr , alen , buffer , len , 0 ) ;