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eeprom: Pull out transfer length computation

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Pull out the code which computes the length of the transfer
into separate code and clean it up a little. This again trims
down the code duplication.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Simon Glass <sjg@chromium.org>
Cc: Tom Rini <trini@konsulko.com>
Cc: Heiko Schocher <hs@denx.de>
Reviewed-by: Heiko Schocher <hs@denx.de>
This commit is contained in:
Marek Vasut 2015-11-10 20:53:29 +01:00 committed by Tom Rini
parent 6717e3c84f
commit 39b6f98bd5
1 changed files with 25 additions and 41 deletions
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66
common/cmd_eeprom.c
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@ -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);