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epic100 endianness annotations and fixes 

* "powerpc or sparc" is not the same as "big-endian", fix the ifdef
* since we tell the card to byteswap the descriptors on big-endian,
  we ought to leave them host-endian...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Al Viro 2008-03-16 22:22:04 +00:00 committed by Jeff Garzik
parent 48f5fec548
commit 9ebfd4929d
1 changed files with 27 additions and 20 deletions
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47
drivers/net/epic100.c
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@ -131,8 +131,8 @@ IIIa. Ring buffers
IVb. References
http://www.smsc.com/main/datasheets/83c171.pdf
http://www.smsc.com/main/datasheets/83c175.pdf
http://www.smsc.com/main/tools/discontinued/83c171.pdf
http://www.smsc.com/main/tools/discontinued/83c175.pdf
http://scyld.com/expert/NWay.html
http://www.national.com/pf/DP/DP83840A.html
@ -227,7 +227,12 @@ static const u16 media2miictl[16] = {
0, 0x0C00, 0x0C00, 0x2000, 0x0100, 0x2100, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0 };
/* The EPIC100 Rx and Tx buffer descriptors. */
/*
* The EPIC100 Rx and Tx buffer descriptors. Note that these
* really ARE host-endian; it's not a misannotation. We tell
* the card to byteswap them internally on big-endian hosts -
* look for #ifdef CONFIG_BIG_ENDIAN in epic_open().
*/
struct epic_tx_desc {
u32 txstatus;
@ -418,7 +423,7 @@ static int __devinit epic_init_one (struct pci_dev *pdev,
/* Note: the '175 does not have a serial EEPROM. */
for (i = 0; i < 3; i++)
((u16 *)dev->dev_addr)[i] = le16_to_cpu(inw(ioaddr + LAN0 + i*4));
((__le16 *)dev->dev_addr)[i] = cpu_to_le16(inw(ioaddr + LAN0 + i*4));
if (debug > 2) {
dev_printk(KERN_DEBUG, &pdev->dev, "EEPROM contents:\n");
@ -682,7 +687,8 @@ static int epic_open(struct net_device *dev)
if (ep->chip_flags & MII_PWRDWN)
outl((inl(ioaddr + NVCTL) & ~0x003C) | 0x4800, ioaddr + NVCTL);
#if defined(__powerpc__) || defined(__sparc__) /* Big endian */
/* Tell the chip to byteswap descriptors on big-endian hosts */
#ifdef CONFIG_BIG_ENDIAN
outl(0x4432 | (RX_FIFO_THRESH<<8), ioaddr + GENCTL);
inl(ioaddr + GENCTL);
outl(0x0432 | (RX_FIFO_THRESH<<8), ioaddr + GENCTL);
@ -695,7 +701,7 @@ static int epic_open(struct net_device *dev)
udelay(20); /* Looks like EPII needs that if you want reliable RX init. FIXME: pci posting bug? */
for (i = 0; i < 3; i++)
outl(cpu_to_le16(((u16*)dev->dev_addr)[i]), ioaddr + LAN0 + i*4);
outl(le16_to_cpu(((__le16*)dev->dev_addr)[i]), ioaddr + LAN0 + i*4);
ep->tx_threshold = TX_FIFO_THRESH;
outl(ep->tx_threshold, ioaddr + TxThresh);
@ -798,7 +804,7 @@ static void epic_restart(struct net_device *dev)
for (i = 16; i > 0; i--)
outl(0x0008, ioaddr + TEST1);
#if defined(__powerpc__) || defined(__sparc__) /* Big endian */
#ifdef CONFIG_BIG_ENDIAN
outl(0x0432 | (RX_FIFO_THRESH<<8), ioaddr + GENCTL);
#else
outl(0x0412 | (RX_FIFO_THRESH<<8), ioaddr + GENCTL);
@ -808,7 +814,7 @@ static void epic_restart(struct net_device *dev)
outl((inl(ioaddr + NVCTL) & ~0x003C) | 0x4800, ioaddr + NVCTL);
for (i = 0; i < 3; i++)
outl(cpu_to_le16(((u16*)dev->dev_addr)[i]), ioaddr + LAN0 + i*4);
outl(le16_to_cpu(((__le16*)dev->dev_addr)[i]), ioaddr + LAN0 + i*4);
ep->tx_threshold = TX_FIFO_THRESH;
outl(ep->tx_threshold, ioaddr + TxThresh);
@ -919,7 +925,7 @@ static void epic_init_ring(struct net_device *dev)
/* Initialize all Rx descriptors. */
for (i = 0; i < RX_RING_SIZE; i++) {
ep->rx_ring[i].rxstatus = 0;
ep->rx_ring[i].buflength = cpu_to_le32(ep->rx_buf_sz);
ep->rx_ring[i].buflength = ep->rx_buf_sz;
ep->rx_ring[i].next = ep->rx_ring_dma +
(i+1)*sizeof(struct epic_rx_desc);
ep->rx_skbuff[i] = NULL;
@ -936,7 +942,7 @@ static void epic_init_ring(struct net_device *dev)
skb_reserve(skb, 2); /* 16 byte align the IP header. */
ep->rx_ring[i].bufaddr = pci_map_single(ep->pci_dev,
skb->data, ep->rx_buf_sz, PCI_DMA_FROMDEVICE);
ep->rx_ring[i].rxstatus = cpu_to_le32(DescOwn);
ep->rx_ring[i].rxstatus = DescOwn;
}
ep->dirty_rx = (unsigned int)(i - RX_RING_SIZE);
@ -974,20 +980,20 @@ static int epic_start_xmit(struct sk_buff *skb, struct net_device *dev)
ep->tx_ring[entry].bufaddr = pci_map_single(ep->pci_dev, skb->data,
skb->len, PCI_DMA_TODEVICE);
if (free_count < TX_QUEUE_LEN/2) {/* Typical path */
ctrl_word = cpu_to_le32(0x100000); /* No interrupt */
ctrl_word = 0x100000; /* No interrupt */
} else if (free_count == TX_QUEUE_LEN/2) {
ctrl_word = cpu_to_le32(0x140000); /* Tx-done intr. */
ctrl_word = 0x140000; /* Tx-done intr. */
} else if (free_count < TX_QUEUE_LEN - 1) {
ctrl_word = cpu_to_le32(0x100000); /* No Tx-done intr. */
ctrl_word = 0x100000; /* No Tx-done intr. */
} else {
/* Leave room for an additional entry. */
ctrl_word = cpu_to_le32(0x140000); /* Tx-done intr. */
ctrl_word = 0x140000; /* Tx-done intr. */
ep->tx_full = 1;
}
ep->tx_ring[entry].buflength = ctrl_word | cpu_to_le32(skb->len);
ep->tx_ring[entry].buflength = ctrl_word | skb->len;
ep->tx_ring[entry].txstatus =
((skb->len >= ETH_ZLEN ? skb->len : ETH_ZLEN) << 16)
| cpu_to_le32(DescOwn);
| DescOwn;
ep->cur_tx++;
if (ep->tx_full)
@ -1041,7 +1047,7 @@ static void epic_tx(struct net_device *dev, struct epic_private *ep)
for (dirty_tx = ep->dirty_tx; cur_tx - dirty_tx > 0; dirty_tx++) {
struct sk_buff *skb;
int entry = dirty_tx % TX_RING_SIZE;
int txstatus = le32_to_cpu(ep->tx_ring[entry].txstatus);
int txstatus = ep->tx_ring[entry].txstatus;
if (txstatus & DescOwn)
break; /* It still hasn't been Txed */
@ -1163,8 +1169,8 @@ static int epic_rx(struct net_device *dev, int budget)
rx_work_limit = budget;
/* If we own the next entry, it's a new packet. Send it up. */
while ((ep->rx_ring[entry].rxstatus & cpu_to_le32(DescOwn)) == 0) {
int status = le32_to_cpu(ep->rx_ring[entry].rxstatus);
while ((ep->rx_ring[entry].rxstatus & DescOwn) == 0) {
int status = ep->rx_ring[entry].rxstatus;
if (debug > 4)
printk(KERN_DEBUG " epic_rx() status was %8.8x.\n", status);
@ -1238,7 +1244,8 @@ static int epic_rx(struct net_device *dev, int budget)
skb->data, ep->rx_buf_sz, PCI_DMA_FROMDEVICE);
work_done++;
}
ep->rx_ring[entry].rxstatus = cpu_to_le32(DescOwn);
/* AV: shouldn't we add a barrier here? */
ep->rx_ring[entry].rxstatus = DescOwn;
}
return work_done;
}