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Date: Wed, 5 May 2010 20:45:54 +0200
From: Sebastien Jan <s-jan@...com>
To: netdev@...r.kernel.org
Cc: linux-omap@...r.kernel.org, Abraham Arce <x0066660@...com>,
Ben Dooks <ben-linux@...ff.org>, Tristram.Ha@...rel.com,
Sebastien Jan <s-jan@...com>
Subject: [PATCH 3/4 v2] 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@...com>
---
drivers/net/ks8851.c | 114 ++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 114 insertions(+), 0 deletions(-)
diff --git a/drivers/net/ks8851.c b/drivers/net/ks8851.c
index 787f9df..8e38c36 100644
--- a/drivers/net/ks8851.c
+++ b/drivers/net/ks8851.c
@@ -1318,6 +1318,117 @@ 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,
@@ -1326,6 +1437,9 @@ 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 */
--
1.6.3.3
--
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