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net/can/mscan: replace hardcoded values with defines 

Not all hardcoded values have been replaced as this made the code quite
unreadable. IMHO this compromise serves the purpose of readability.

Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Wolfram Sang 2009-11-16 12:57:52 +00:00 committed by David S. Miller
parent 81593c1cea
commit 74ff60b29e
2 changed files with 15 additions and 5 deletions
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15
drivers/net/can/mscan/mscan.c
View File

@ -211,18 +211,23 @@ static netdev_tx_t mscan_start_xmit(struct sk_buff *skb, struct net_device *dev)
rtr = frame->can_id & CAN_RTR_FLAG;
/* RTR is always the lowest bit of interest, then IDs follow */
if (frame->can_id & CAN_EFF_FLAG) {
can_id = (frame->can_id & CAN_EFF_MASK) << 1;
can_id = (frame->can_id & CAN_EFF_MASK)
<< (MSCAN_EFF_RTR_SHIFT + 1);
if (rtr)
can_id |= 1;
can_id |= 1 << MSCAN_EFF_RTR_SHIFT;
out_be16(&regs->tx.idr3_2, can_id);
can_id >>= 16;
can_id = (can_id & 0x7) | ((can_id << 2) & 0xffe0) | (3 << 3);
/* EFF_FLAGS are inbetween the IDs :( */
can_id = (can_id & 0x7) | ((can_id << 2) & 0xffe0)
| MSCAN_EFF_FLAGS;
} else {
can_id = (frame->can_id & CAN_SFF_MASK) << 5;
can_id = (frame->can_id & CAN_SFF_MASK)
<< (MSCAN_SFF_RTR_SHIFT + 1);
if (rtr)
can_id |= 1 << 4;
can_id |= 1 << MSCAN_SFF_RTR_SHIFT;
}
out_be16(&regs->tx.idr1_0, can_id);

5
drivers/net/can/mscan/mscan.h
View File

@ -131,6 +131,11 @@
/* MSCAN Miscellaneous Register (CANMISC) bits */
#define MSCAN_BOHOLD 0x01
/* MSCAN Identifier Register (IDR) bits */
#define MSCAN_SFF_RTR_SHIFT 4
#define MSCAN_EFF_RTR_SHIFT 0
#define MSCAN_EFF_FLAGS 0x18 /* IDE + SRR */
#ifdef MSCAN_FOR_MPC5200
#define _MSCAN_RESERVED_(n, num) u8 _res##n[num]
#define _MSCAN_RESERVED_DSR_SIZE 2