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ks8851: companion eeprom access through ethtool 

Accessing ks8851 companion eeprom permits modifying the ks8851 stored
MAC address.

Example how to change the MAC address using ethtool, to set the
01:23:45:67:89:AB MAC address:
$ echo "0:AB8976452301" | xxd -r > mac.bin
$ sudo ethtool -E eth0 magic 0x8870 offset 2 < mac.bin

Signed-off-by: Sebastien Jan <s-jan@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sebastien Jan 2010-05-05 08:45:54 +00:00 committed by David S. Miller
parent a4bdfff744
commit a84afa40e0
1 changed files with 114 additions and 0 deletions
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114
drivers/net/ks8851.c
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@ -1308,6 +1308,117 @@ static int ks8851_nway_reset(struct net_device *dev)
return mii_nway_restart(&ks->mii);
}
static int ks8851_get_eeprom_len(struct net_device *dev)
{
struct ks8851_net *ks = netdev_priv(dev);
return ks->eeprom_size;
}
static int ks8851_get_eeprom(struct net_device *dev,
struct ethtool_eeprom *eeprom, u8 *bytes)
{
struct ks8851_net *ks = netdev_priv(dev);
u16 *eeprom_buff;
int first_word;
int last_word;
int ret_val = 0;
u16 i;
if (eeprom->len == 0)
return -EINVAL;
if (eeprom->len > ks->eeprom_size)
return -EINVAL;
eeprom->magic = ks8851_rdreg16(ks, KS_CIDER);
first_word = eeprom->offset >> 1;
last_word = (eeprom->offset + eeprom->len - 1) >> 1;
eeprom_buff = kmalloc(sizeof(u16) *
(last_word - first_word + 1), GFP_KERNEL);
if (!eeprom_buff)
return -ENOMEM;
for (i = 0; i < last_word - first_word + 1; i++)
eeprom_buff[i] = ks8851_eeprom_read(dev, first_word + 1);
/* Device's eeprom is little-endian, word addressable */
for (i = 0; i < last_word - first_word + 1; i++)
le16_to_cpus(&eeprom_buff[i]);
memcpy(bytes, (u8 *)eeprom_buff + (eeprom->offset & 1), eeprom->len);
kfree(eeprom_buff);
return ret_val;
}
static int ks8851_set_eeprom(struct net_device *dev,
struct ethtool_eeprom *eeprom, u8 *bytes)
{
struct ks8851_net *ks = netdev_priv(dev);
u16 *eeprom_buff;
void *ptr;
int max_len;
int first_word;
int last_word;
int ret_val = 0;
u16 i;
if (eeprom->len == 0)
return -EOPNOTSUPP;
if (eeprom->len > ks->eeprom_size)
return -EINVAL;
if (eeprom->magic != ks8851_rdreg16(ks, KS_CIDER))
return -EFAULT;
first_word = eeprom->offset >> 1;
last_word = (eeprom->offset + eeprom->len - 1) >> 1;
max_len = (last_word - first_word + 1) * 2;
eeprom_buff = kmalloc(max_len, GFP_KERNEL);
if (!eeprom_buff)
return -ENOMEM;
ptr = (void *)eeprom_buff;
if (eeprom->offset & 1) {
/* need read/modify/write of first changed EEPROM word */
/* only the second byte of the word is being modified */
eeprom_buff[0] = ks8851_eeprom_read(dev, first_word);
ptr++;
}
if ((eeprom->offset + eeprom->len) & 1)
/* need read/modify/write of last changed EEPROM word */
/* only the first byte of the word is being modified */
eeprom_buff[last_word - first_word] =
ks8851_eeprom_read(dev, last_word);
/* Device's eeprom is little-endian, word addressable */
le16_to_cpus(&eeprom_buff[0]);
le16_to_cpus(&eeprom_buff[last_word - first_word]);
memcpy(ptr, bytes, eeprom->len);
for (i = 0; i < last_word - first_word + 1; i++)
eeprom_buff[i] = cpu_to_le16(eeprom_buff[i]);
ks8851_eeprom_write(dev, EEPROM_OP_EWEN, 0, 0);
for (i = 0; i < last_word - first_word + 1; i++) {
ks8851_eeprom_write(dev, EEPROM_OP_WRITE, first_word + i,
eeprom_buff[i]);
mdelay(EEPROM_WRITE_TIME);
}
ks8851_eeprom_write(dev, EEPROM_OP_EWDS, 0, 0);
kfree(eeprom_buff);
return ret_val;
}
static const struct ethtool_ops ks8851_ethtool_ops = {
.get_drvinfo = ks8851_get_drvinfo,
.get_msglevel = ks8851_get_msglevel,
@ -1316,6 +1427,9 @@ static const struct ethtool_ops ks8851_ethtool_ops = {
.set_settings = ks8851_set_settings,
.get_link = ks8851_get_link,
.nway_reset = ks8851_nway_reset,
.get_eeprom_len = ks8851_get_eeprom_len,
.get_eeprom = ks8851_get_eeprom,
.set_eeprom = ks8851_set_eeprom,
};
/* MII interface controls */