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net: tsec: Fix and cleanup tsec_mcast_addr() 

There are several implementation issues for tsec_mcast_addr()
addressed by this patch:
* unmanaged, not portable r/w access to registers; fixed with
setbits_be32()/ clrbits_be32()
* use of volatile pointers
* unnecessary forced cast to u8 for the ether_crc() result
* removed redundant parens
* corrected some comment slips

Signed-off-by: Claudiu Manoil <claudiu.manoil@freescale.com>
Patch: 279000
This commit is contained in:
Claudiu Manoil 2013-09-30 12:44:40 +03:00 committed by Joe Hershberger
parent 9c4cffacec
commit 876d4515e3
1 changed files with 15 additions and 16 deletions
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31
drivers/net/tsec.c
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@ -113,32 +113,31 @@ static void tsec_configure_serdes(struct tsec_private *priv)
* 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
* gaddr0-7. gaddr0's MSB is entry 0, and gaddr7's LSB is entry
* 255. 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
* for PowerPC (tm) is usually the case) in the register holds
* the entry. */
static int
tsec_mcast_addr(struct eth_device *dev, const 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;
struct tsec __iomem *regs = priv->regs;
u32 result, value;
u8 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));
result = ether_crc(MAC_ADDR_LEN, mcast_mac);
whichbit = (result >> 24) & 0x1f; /* the 5 LSB = which bit to set */
whichreg = result >> 29; /* the 3 MSB = which reg to set it in */
reg_array = &(regs->hash.gaddr0);
value = 1 << (31-whichbit);
if (set)
setbits_be32(&regs->hash.gaddr0 + whichreg, value);
else
clrbits_be32(&regs->hash.gaddr0 + whichreg, value);
if (set) {
reg_array[whichreg] |= value;
} else {
reg_array[whichreg] &= ~value;
}
return 0;
}
#endif /* Multicast TFTP ? */