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authorDavid Updegraff <dave@cray.com>2007-06-11 10:41:07 -0500
committerBen Warren <bwarren@qstreams.com>2007-08-13 23:22:31 -0400
commit53a5c424bf8655b7b4e2c305a441963259a26a81 (patch)
tree281e5aed270485a3c496479c0d46cea87e00c420 /drivers/tsec.c
parent5d110f0aa69f065ee386ec1840dfee1e8cc46bc1 (diff)
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multicast tftp: RFC2090
Implemented IETF RFC2090, Multicast TFTP. Initial implementation on Realtek RTL8139 and Freescale TSEC. Signed-off-by: David Updegraff <dave@cray.com> Signed-off-by: Ben Warren <bwarren@qstreams.com>
Diffstat (limited to 'drivers/tsec.c')
-rw-r--r--drivers/tsec.c48
1 files changed, 48 insertions, 0 deletions
diff --git a/drivers/tsec.c b/drivers/tsec.c
index c011123..fd21ed4 100644
--- a/drivers/tsec.c
+++ b/drivers/tsec.c
@@ -129,6 +129,9 @@ static int tsec_miiphy_write(char *devname, unsigned char addr,
unsigned char reg, unsigned short value);
static int tsec_miiphy_read(char *devname, unsigned char addr,
unsigned char reg, unsigned short *value);
+#ifdef CONFIG_MCAST_TFTP
+static int tsec_mcast_addr (struct eth_device *dev, u8 mcast_mac, u8 set);
+#endif
/* Initialize device structure. Returns success if PHY
* initialization succeeded (i.e. if it recognizes the PHY)
@@ -167,6 +170,9 @@ int tsec_initialize(bd_t * bis, int index, char *devname)
dev->halt = tsec_halt;
dev->send = tsec_send;
dev->recv = tsec_recv;
+#ifdef CONFIG_MCAST_TFTP
+ dev->mcast = tsec_mcast_addr;
+#endif
/* Tell u-boot to get the addr from the env */
for (i = 0; i < 6; i++)
@@ -1539,4 +1545,46 @@ static int tsec_miiphy_write(char *devname, unsigned char addr,
#endif
+#ifdef CONFIG_MCAST_TFTP
+
+/* CREDITS: linux gianfar driver, slightly adjusted... thanx. */
+
+/* Set the appropriate hash bit for the given addr */
+
+/* The algorithm works like so:
+ * 1) Take the Destination Address (ie the multicast address), and
+ * do a CRC on it (little endian), and reverse the bits of the
+ * result.
+ * 2) Use the 8 most significant bits as a hash into a 256-entry
+ * table. The table is controlled through 8 32-bit registers:
+ * gaddr0-7. gaddr0's MSB is entry 0, and gaddr7's LSB is
+ * gaddr7. This means that the 3 most significant bits in the
+ * hash index which gaddr register to use, and the 5 other bits
+ * indicate which bit (assuming an IBM numbering scheme, which
+ * for PowerPC (tm) is usually the case) in the tregister holds
+ * the entry. */
+static int
+tsec_mcast_addr (struct eth_device *dev, u8 mcast_mac, u8 set)
+{
+ struct tsec_private *priv = privlist[1];
+ volatile tsec_t *regs = priv->regs;
+ volatile u32 *reg_array, value;
+ u8 result, whichbit, whichreg;
+
+ result = (u8)((ether_crc(MAC_ADDR_LEN,mcast_mac) >> 24) & 0xff);
+ whichbit = result & 0x1f; /* the 5 LSB = which bit to set */
+ whichreg = result >> 5; /* the 3 MSB = which reg to set it in */
+ value = (1 << (31-whichbit));
+
+ reg_array = &(regs->hash.gaddr0);
+
+ if (set) {
+ reg_array[whichreg] |= value;
+ } else {
+ reg_array[whichreg] &= ~value;
+ }
+ return 0;
+}
+#endif /* Multicast TFTP ? */
+
#endif /* CONFIG_TSEC_ENET */