pasemi_mac.c

linux 内核源代码

			  mac->tx->irq_name, dev);
	if (ret) {
		dev_err(&mac->pdev->dev, "request_irq of irq %d failed: %d\n",
			base_irq + mac->dma_txch, ret);
		goto out_tx_int;
	}

	ret = request_irq(mac->rx_irq, &pasemi_mac_rx_intr, IRQF_DISABLED,
			  mac->rx->irq_name, dev);
	if (ret) {
		dev_err(&mac->pdev->dev, "request_irq of irq %d failed: %d\n",
			base_irq + 20 + mac->dma_rxch, ret);
		goto out_rx_int;
	}

	if (mac->phydev)
		phy_start(mac->phydev);

	return 0;

out_rx_int:
	free_irq(mac->tx_irq, dev);
out_tx_int:
	napi_disable(&mac->napi);
	netif_stop_queue(dev);
	pasemi_mac_free_tx_resources(dev);
out_tx_resources:
	pasemi_mac_free_rx_resources(dev);
out_rx_resources:

	return ret;
}

#define MAX_RETRIES 5000

static int pasemi_mac_close(struct net_device *dev)
{
	struct pasemi_mac *mac = netdev_priv(dev);
	unsigned int sta;
	int retries;

	if (mac->phydev) {
		phy_stop(mac->phydev);
		phy_disconnect(mac->phydev);
	}

	netif_stop_queue(dev);
	napi_disable(&mac->napi);

	sta = read_dma_reg(mac, PAS_DMA_RXINT_RCMDSTA(mac->dma_if));
	if (sta & (PAS_DMA_RXINT_RCMDSTA_BP |
		      PAS_DMA_RXINT_RCMDSTA_OO |
		      PAS_DMA_RXINT_RCMDSTA_BT))
		printk(KERN_DEBUG "pasemi_mac: rcmdsta error: 0x%08x\n", sta);

	sta = read_dma_reg(mac, PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch));
	if (sta & (PAS_DMA_RXCHAN_CCMDSTA_DU |
		     PAS_DMA_RXCHAN_CCMDSTA_OD |
		     PAS_DMA_RXCHAN_CCMDSTA_FD |
		     PAS_DMA_RXCHAN_CCMDSTA_DT))
		printk(KERN_DEBUG "pasemi_mac: ccmdsta error: 0x%08x\n", sta);

	sta = read_dma_reg(mac, PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch));
	if (sta & (PAS_DMA_TXCHAN_TCMDSTA_SZ |
		      PAS_DMA_TXCHAN_TCMDSTA_DB |
		      PAS_DMA_TXCHAN_TCMDSTA_DE |
		      PAS_DMA_TXCHAN_TCMDSTA_DA))
		printk(KERN_DEBUG "pasemi_mac: tcmdsta error: 0x%08x\n", sta);

	/* Clean out any pending buffers */
	pasemi_mac_clean_tx(mac);
	pasemi_mac_clean_rx(mac, RX_RING_SIZE);

	/* Disable interface */
	write_dma_reg(mac, PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch), PAS_DMA_TXCHAN_TCMDSTA_ST);
	write_dma_reg(mac, PAS_DMA_RXINT_RCMDSTA(mac->dma_if), PAS_DMA_RXINT_RCMDSTA_ST);
	write_dma_reg(mac, PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch), PAS_DMA_RXCHAN_CCMDSTA_ST);

	for (retries = 0; retries < MAX_RETRIES; retries++) {
		sta = read_dma_reg(mac, PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch));
		if (!(sta & PAS_DMA_TXCHAN_TCMDSTA_ACT))
			break;
		cond_resched();
	}

	if (sta & PAS_DMA_TXCHAN_TCMDSTA_ACT)
		dev_err(&mac->dma_pdev->dev, "Failed to stop tx channel\n");

	for (retries = 0; retries < MAX_RETRIES; retries++) {
		sta = read_dma_reg(mac, PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch));
		if (!(sta & PAS_DMA_RXCHAN_CCMDSTA_ACT))
			break;
		cond_resched();
	}

	if (sta & PAS_DMA_RXCHAN_CCMDSTA_ACT)
		dev_err(&mac->dma_pdev->dev, "Failed to stop rx channel\n");

	for (retries = 0; retries < MAX_RETRIES; retries++) {
		sta = read_dma_reg(mac, PAS_DMA_RXINT_RCMDSTA(mac->dma_if));
		if (!(sta & PAS_DMA_RXINT_RCMDSTA_ACT))
			break;
		cond_resched();
	}

	if (sta & PAS_DMA_RXINT_RCMDSTA_ACT)
		dev_err(&mac->dma_pdev->dev, "Failed to stop rx interface\n");

	/* Then, disable the channel. This must be done separately from
	 * stopping, since you can't disable when active.
	 */

	write_dma_reg(mac, PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch), 0);
	write_dma_reg(mac, PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch), 0);
	write_dma_reg(mac, PAS_DMA_RXINT_RCMDSTA(mac->dma_if), 0);

	free_irq(mac->tx_irq, dev);
	free_irq(mac->rx_irq, dev);

	/* Free resources */
	pasemi_mac_free_rx_resources(dev);
	pasemi_mac_free_tx_resources(dev);

	return 0;
}

static int pasemi_mac_start_tx(struct sk_buff *skb, struct net_device *dev)
{
	struct pasemi_mac *mac = netdev_priv(dev);
	struct pasemi_mac_txring *txring;
	u64 dflags, mactx;
	dma_addr_t map[MAX_SKB_FRAGS+1];
	unsigned int map_size[MAX_SKB_FRAGS+1];
	unsigned long flags;
	int i, nfrags;

	dflags = XCT_MACTX_O | XCT_MACTX_ST | XCT_MACTX_CRC_PAD;

	if (skb->ip_summed == CHECKSUM_PARTIAL) {
		const unsigned char *nh = skb_network_header(skb);

		switch (ip_hdr(skb)->protocol) {
		case IPPROTO_TCP:
			dflags |= XCT_MACTX_CSUM_TCP;
			dflags |= XCT_MACTX_IPH(skb_network_header_len(skb) >> 2);
			dflags |= XCT_MACTX_IPO(nh - skb->data);
			break;
		case IPPROTO_UDP:
			dflags |= XCT_MACTX_CSUM_UDP;
			dflags |= XCT_MACTX_IPH(skb_network_header_len(skb) >> 2);
			dflags |= XCT_MACTX_IPO(nh - skb->data);
			break;
		}
	}

	nfrags = skb_shinfo(skb)->nr_frags;

	map[0] = pci_map_single(mac->dma_pdev, skb->data, skb_headlen(skb),
				PCI_DMA_TODEVICE);
	map_size[0] = skb_headlen(skb);
	if (dma_mapping_error(map[0]))
		goto out_err_nolock;

	for (i = 0; i < nfrags; i++) {
		skb_frag_t *frag = &skb_shinfo(skb)->frags[i];

		map[i+1] = pci_map_page(mac->dma_pdev, frag->page,
					frag->page_offset, frag->size,
					PCI_DMA_TODEVICE);
		map_size[i+1] = frag->size;
		if (dma_mapping_error(map[i+1])) {
			nfrags = i;
			goto out_err_nolock;
		}
	}

	mactx = dflags | XCT_MACTX_LLEN(skb->len);

	txring = mac->tx;

	spin_lock_irqsave(&txring->lock, flags);

	/* Avoid stepping on the same cache line that the DMA controller
	 * is currently about to send, so leave at least 8 words available.
	 * Total free space needed is mactx + fragments + 8
	 */
	if (RING_AVAIL(txring) < nfrags + 10) {
		/* no room -- stop the queue and wait for tx intr */
		netif_stop_queue(dev);
		goto out_err;
	}

	TX_RING(mac, txring->next_to_fill) = mactx;
	txring->next_to_fill++;
	TX_RING_INFO(mac, txring->next_to_fill).skb = skb;
	for (i = 0; i <= nfrags; i++) {
		TX_RING(mac, txring->next_to_fill+i) =
		XCT_PTR_LEN(map_size[i]) | XCT_PTR_ADDR(map[i]);
		TX_RING_INFO(mac, txring->next_to_fill+i).dma = map[i];
	}

	/* We have to add an even number of 8-byte entries to the ring
	 * even if the last one is unused. That means always an odd number
	 * of pointers + one mactx descriptor.
	 */
	if (nfrags & 1)
		nfrags++;

	txring->next_to_fill = (txring->next_to_fill + nfrags + 1) &
				(TX_RING_SIZE-1);

	dev->stats.tx_packets++;
	dev->stats.tx_bytes += skb->len;

	spin_unlock_irqrestore(&txring->lock, flags);

	write_dma_reg(mac, PAS_DMA_TXCHAN_INCR(mac->dma_txch), (nfrags+2) >> 1);

	return NETDEV_TX_OK;

out_err:
	spin_unlock_irqrestore(&txring->lock, flags);
out_err_nolock:
	while (nfrags--)
		pci_unmap_single(mac->dma_pdev, map[nfrags], map_size[nfrags],
				 PCI_DMA_TODEVICE);

	return NETDEV_TX_BUSY;
}

static void pasemi_mac_set_rx_mode(struct net_device *dev)
{
	struct pasemi_mac *mac = netdev_priv(dev);
	unsigned int flags;

	flags = read_mac_reg(mac, PAS_MAC_CFG_PCFG);

	/* Set promiscuous */
	if (dev->flags & IFF_PROMISC)
		flags |= PAS_MAC_CFG_PCFG_PR;
	else
		flags &= ~PAS_MAC_CFG_PCFG_PR;

	write_mac_reg(mac, PAS_MAC_CFG_PCFG, flags);
}


static int pasemi_mac_poll(struct napi_struct *napi, int budget)
{
	struct pasemi_mac *mac = container_of(napi, struct pasemi_mac, napi);
	struct net_device *dev = mac->netdev;
	int pkts;

	pasemi_mac_clean_tx(mac);
	pkts = pasemi_mac_clean_rx(mac, budget);
	if (pkts < budget) {
		/* all done, no more packets present */
		netif_rx_complete(dev, napi);

		pasemi_mac_restart_rx_intr(mac);
	}
	return pkts;
}

static void __iomem * __devinit map_onedev(struct pci_dev *p, int index)
{
	struct device_node *dn;
	void __iomem *ret;

	dn = pci_device_to_OF_node(p);
	if (!dn)
		goto fallback;

	ret = of_iomap(dn, index);
	if (!ret)
		goto fallback;

	return ret;
fallback:
	/* This is hardcoded and ugly, but we have some firmware versions
	 * that don't provide the register space in the device tree. Luckily
	 * they are at well-known locations so we can just do the math here.
	 */
	return ioremap(0xe0000000 + (p->devfn << 12), 0x2000);
}

static int __devinit pasemi_mac_map_regs(struct pasemi_mac *mac)
{
	struct resource res;
	struct device_node *dn;
	int err;

	mac->dma_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa007, NULL);
	if (!mac->dma_pdev) {
		dev_err(&mac->pdev->dev, "Can't find DMA Controller\n");
		return -ENODEV;
	}

	mac->iob_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa001, NULL);
	if (!mac->iob_pdev) {
		dev_err(&mac->pdev->dev, "Can't find I/O Bridge\n");
		return -ENODEV;
	}

	mac->regs = map_onedev(mac->pdev, 0);
	mac->dma_regs = map_onedev(mac->dma_pdev, 0);
	mac->iob_regs = map_onedev(mac->iob_pdev, 0);

	if (!mac->regs || !mac->dma_regs || !mac->iob_regs) {
		dev_err(&mac->pdev->dev, "Can't map registers\n");
		return -ENODEV;
	}

	/* The dma status structure is located in the I/O bridge, and
	 * is cache coherent.
	 */
	if (!dma_status) {
		dn = pci_device_to_OF_node(mac->iob_pdev);
		if (dn)
			err = of_address_to_resource(dn, 1, &res);
		if (!dn || err) {
			/* Fallback for old firmware */
			res.start = 0xfd800000;
			res.end = res.start + 0x1000;
		}
		dma_status = __ioremap(res.start, res.end-res.start, 0);
	}

	return 0;
}

static int __devinit
pasemi_mac_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
	static int index = 0;
	struct net_device *dev;
	struct pasemi_mac *mac;
	int err;
	DECLARE_MAC_BUF(mac_buf);

	err = pci_enable_device(pdev);
	if (err)
		return err;

	dev = alloc_etherdev(sizeof(struct pasemi_mac));
	if (dev == NULL) {
		dev_err(&pdev->dev,
			"pasemi_mac: Could not allocate ethernet device.\n");
		err = -ENOMEM;
		goto out_disable_device;
	}

	pci_set_drvdata(pdev, dev);
	SET_NETDEV_DEV(dev, &pdev->dev);

	mac = netdev_priv(dev);

	mac->pdev = pdev;
	mac->netdev = dev;

	netif_napi_add(dev, &mac->napi, pasemi_mac_poll, 64);

	dev->features = NETIF_F_IP_CSUM | NETIF_F_LLTX | NETIF_F_SG;

	/* These should come out of the device tree eventually */
	mac->dma_txch = index;
	mac->dma_rxch = index;

	/* We probe GMAC before XAUI, but the DMA interfaces are
	 * in XAUI, GMAC order.
	 */
	if (index < 4)
		mac->dma_if = index + 2;
	else
		mac->dma_if = index - 4;
	index++;

	switch (pdev->device) {
	case 0xa005:
		mac->type = MAC_TYPE_GMAC;
		break;
	case 0xa006:
		mac->type = MAC_TYPE_XAUI;
		break;
	default:
		err = -ENODEV;
		goto out;
	}

	/* get mac addr from device tree */
	if (pasemi_get_mac_addr(mac) || !is_valid_ether_addr(mac->mac_addr)) {
		err = -ENODEV;
		goto out;
	}
	memcpy(dev->dev_addr, mac->mac_addr, sizeof(mac->mac_addr));

	dev->open = pasemi_mac_open;
	dev->stop = pasemi_mac_close;
	dev->hard_start_xmit = pasemi_mac_start_tx;
	dev->set_multicast_list = pasemi_mac_set_rx_mode;

	err = pasemi_mac_map_regs(mac);
	if (err)
		goto out;

	mac->rx_status = &dma_status->rx_sta[mac->dma_rxch];
	mac->tx_status = &dma_status->tx_sta[mac->dma_txch];

	mac->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);

	/* Enable most messages by default */
	mac->msg_enable = (NETIF_MSG_IFUP << 1 ) - 1;

	err = register_netdev(dev);

	if (err) {
		dev_err(&mac->pdev->dev, "register_netdev failed with error %d\n",
			err);
		goto out;
	} else if netif_msg_probe(mac)
		printk(KERN_INFO "%s: PA Semi %s: intf %d, txch %d, rxch %d, "
		       "hw addr %s\n",
		       dev->name, mac->type == MAC_TYPE_GMAC ? "GMAC" : "XAUI",
		       mac->dma_if, mac->dma_txch, mac->dma_rxch,
		       print_mac(mac_buf, dev->dev_addr));

	return err;

out:
	if (mac->iob_pdev)
		pci_dev_put(mac->iob_pdev);
	if (mac->dma_pdev)
		pci_dev_put(mac->dma_pdev);
	if (mac->dma_regs)
		iounmap(mac->dma_regs);
	if (mac->iob_regs)
		iounmap(mac->iob_regs);
	if (mac->regs)
		iounmap(mac->regs);

	free_netdev(dev);
out_disable_device:
	pci_disable_device(pdev);
	return err;

}

static void __devexit pasemi_mac_remove(struct pci_dev *pdev)
{
	struct net_device *netdev = pci_get_drvdata(pdev);
	struct pasemi_mac *mac;

	if (!netdev)
		return;

	mac = netdev_priv(netdev);

	unregister_netdev(netdev);

	pci_disable_device(pdev);
	pci_dev_put(mac->dma_pdev);
	pci_dev_put(mac->iob_pdev);

	iounmap(mac->regs);
	iounmap(mac->dma_regs);
	iounmap(mac->iob_regs);

	pci_set_drvdata(pdev, NULL);
	free_netdev(netdev);
}

static struct pci_device_id pasemi_mac_pci_tbl[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_PASEMI, 0xa005) },
	{ PCI_DEVICE(PCI_VENDOR_ID_PASEMI, 0xa006) },
	{ },
};

MODULE_DEVICE_TABLE(pci, pasemi_mac_pci_tbl);

static struct pci_driver pasemi_mac_driver = {
	.name		= "pasemi_mac",
	.id_table	= pasemi_mac_pci_tbl,
	.probe		= pasemi_mac_probe,
	.remove		= __devexit_p(pasemi_mac_remove),
};

static void __exit pasemi_mac_cleanup_module(void)
{
	pci_unregister_driver(&pasemi_mac_driver);
	__iounmap(dma_status);
	dma_status = NULL;
}

int pasemi_mac_init_module(void)
{
	return pci_register_driver(&pasemi_mac_driver);
}

module_init(pasemi_mac_init_module);
module_exit(pasemi_mac_cleanup_module);