ep93xx_eth.c

来自「linux 内核源代码」· C语言 代码 · 共 917 行 · 第 1/2 页

							ep->descs_dma_addr);
}

/*
 * The hardware enforces a sub-2K maximum packet size, so we put
 * two buffers on every hardware page.
 */
static int ep93xx_alloc_buffers(struct ep93xx_priv *ep)
{
	int i;

	ep->descs = dma_alloc_coherent(NULL, sizeof(struct ep93xx_descs),
				&ep->descs_dma_addr, GFP_KERNEL | GFP_DMA);
	if (ep->descs == NULL)
		return 1;

	for (i = 0; i < RX_QUEUE_ENTRIES; i += 2) {
		void *page;
		dma_addr_t d;

		page = (void *)__get_free_page(GFP_KERNEL | GFP_DMA);
		if (page == NULL)
			goto err;

		d = dma_map_single(NULL, page, PAGE_SIZE, DMA_FROM_DEVICE);
		if (dma_mapping_error(d)) {
			free_page((unsigned long)page);
			goto err;
		}

		ep->rx_buf[i] = page;
		ep->descs->rdesc[i].buf_addr = d;
		ep->descs->rdesc[i].rdesc1 = (i << 16) | PKT_BUF_SIZE;

		ep->rx_buf[i + 1] = page + PKT_BUF_SIZE;
		ep->descs->rdesc[i + 1].buf_addr = d + PKT_BUF_SIZE;
		ep->descs->rdesc[i + 1].rdesc1 = ((i + 1) << 16) | PKT_BUF_SIZE;
	}

	for (i = 0; i < TX_QUEUE_ENTRIES; i += 2) {
		void *page;
		dma_addr_t d;

		page = (void *)__get_free_page(GFP_KERNEL | GFP_DMA);
		if (page == NULL)
			goto err;

		d = dma_map_single(NULL, page, PAGE_SIZE, DMA_TO_DEVICE);
		if (dma_mapping_error(d)) {
			free_page((unsigned long)page);
			goto err;
		}

		ep->tx_buf[i] = page;
		ep->descs->tdesc[i].buf_addr = d;

		ep->tx_buf[i + 1] = page + PKT_BUF_SIZE;
		ep->descs->tdesc[i + 1].buf_addr = d + PKT_BUF_SIZE;
	}

	return 0;

err:
	ep93xx_free_buffers(ep);
	return 1;
}

static int ep93xx_start_hw(struct net_device *dev)
{
	struct ep93xx_priv *ep = netdev_priv(dev);
	unsigned long addr;
	int i;

	wrl(ep, REG_SELFCTL, REG_SELFCTL_RESET);
	for (i = 0; i < 10; i++) {
		if ((rdl(ep, REG_SELFCTL) & REG_SELFCTL_RESET) == 0)
			break;
		msleep(1);
	}

	if (i == 10) {
		printk(KERN_CRIT DRV_MODULE_NAME ": hw failed to reset\n");
		return 1;
	}

	wrl(ep, REG_SELFCTL, ((ep->mdc_divisor - 1) << 9));

	/* Does the PHY support preamble suppress?  */
	if ((ep93xx_mdio_read(dev, ep->mii.phy_id, MII_BMSR) & 0x0040) != 0)
		wrl(ep, REG_SELFCTL, ((ep->mdc_divisor - 1) << 9) | (1 << 8));

	/* Receive descriptor ring.  */
	addr = ep->descs_dma_addr + offsetof(struct ep93xx_descs, rdesc);
	wrl(ep, REG_RXDQBADD, addr);
	wrl(ep, REG_RXDCURADD, addr);
	wrw(ep, REG_RXDQBLEN, RX_QUEUE_ENTRIES * sizeof(struct ep93xx_rdesc));

	/* Receive status ring.  */
	addr = ep->descs_dma_addr + offsetof(struct ep93xx_descs, rstat);
	wrl(ep, REG_RXSTSQBADD, addr);
	wrl(ep, REG_RXSTSQCURADD, addr);
	wrw(ep, REG_RXSTSQBLEN, RX_QUEUE_ENTRIES * sizeof(struct ep93xx_rstat));

	/* Transmit descriptor ring.  */
	addr = ep->descs_dma_addr + offsetof(struct ep93xx_descs, tdesc);
	wrl(ep, REG_TXDQBADD, addr);
	wrl(ep, REG_TXDQCURADD, addr);
	wrw(ep, REG_TXDQBLEN, TX_QUEUE_ENTRIES * sizeof(struct ep93xx_tdesc));

	/* Transmit status ring.  */
	addr = ep->descs_dma_addr + offsetof(struct ep93xx_descs, tstat);
	wrl(ep, REG_TXSTSQBADD, addr);
	wrl(ep, REG_TXSTSQCURADD, addr);
	wrw(ep, REG_TXSTSQBLEN, TX_QUEUE_ENTRIES * sizeof(struct ep93xx_tstat));

	wrl(ep, REG_BMCTL, REG_BMCTL_ENABLE_TX | REG_BMCTL_ENABLE_RX);
	wrl(ep, REG_INTEN, REG_INTEN_TX | REG_INTEN_RX);
	wrl(ep, REG_GIINTMSK, 0);

	for (i = 0; i < 10; i++) {
		if ((rdl(ep, REG_BMSTS) & REG_BMSTS_RX_ACTIVE) != 0)
			break;
		msleep(1);
	}

	if (i == 10) {
		printk(KERN_CRIT DRV_MODULE_NAME ": hw failed to start\n");
		return 1;
	}

	wrl(ep, REG_RXDENQ, RX_QUEUE_ENTRIES);
	wrl(ep, REG_RXSTSENQ, RX_QUEUE_ENTRIES);

	wrb(ep, REG_INDAD0, dev->dev_addr[0]);
	wrb(ep, REG_INDAD1, dev->dev_addr[1]);
	wrb(ep, REG_INDAD2, dev->dev_addr[2]);
	wrb(ep, REG_INDAD3, dev->dev_addr[3]);
	wrb(ep, REG_INDAD4, dev->dev_addr[4]);
	wrb(ep, REG_INDAD5, dev->dev_addr[5]);
	wrl(ep, REG_AFP, 0);

	wrl(ep, REG_MAXFRMLEN, (MAX_PKT_SIZE << 16) | MAX_PKT_SIZE);

	wrl(ep, REG_RXCTL, REG_RXCTL_DEFAULT);
	wrl(ep, REG_TXCTL, REG_TXCTL_ENABLE);

	return 0;
}

static void ep93xx_stop_hw(struct net_device *dev)
{
	struct ep93xx_priv *ep = netdev_priv(dev);
	int i;

	wrl(ep, REG_SELFCTL, REG_SELFCTL_RESET);
	for (i = 0; i < 10; i++) {
		if ((rdl(ep, REG_SELFCTL) & REG_SELFCTL_RESET) == 0)
			break;
		msleep(1);
	}

	if (i == 10)
		printk(KERN_CRIT DRV_MODULE_NAME ": hw failed to reset\n");
}

static int ep93xx_open(struct net_device *dev)
{
	struct ep93xx_priv *ep = netdev_priv(dev);
	int err;

	if (ep93xx_alloc_buffers(ep))
		return -ENOMEM;

	if (is_zero_ether_addr(dev->dev_addr)) {
		random_ether_addr(dev->dev_addr);
		printk(KERN_INFO "%s: generated random MAC address "
			"%.2x:%.2x:%.2x:%.2x:%.2x:%.2x.\n", dev->name,
			dev->dev_addr[0], dev->dev_addr[1],
			dev->dev_addr[2], dev->dev_addr[3],
			dev->dev_addr[4], dev->dev_addr[5]);
	}

	napi_enable(&ep->napi);

	if (ep93xx_start_hw(dev)) {
		napi_disable(&ep->napi);
		ep93xx_free_buffers(ep);
		return -EIO;
	}

	spin_lock_init(&ep->rx_lock);
	ep->rx_pointer = 0;
	ep->tx_clean_pointer = 0;
	ep->tx_pointer = 0;
	spin_lock_init(&ep->tx_pending_lock);
	ep->tx_pending = 0;

	err = request_irq(ep->irq, ep93xx_irq, IRQF_SHARED, dev->name, dev);
	if (err) {
		napi_disable(&ep->napi);
		ep93xx_stop_hw(dev);
		ep93xx_free_buffers(ep);
		return err;
	}

	wrl(ep, REG_GIINTMSK, REG_GIINTMSK_ENABLE);

	netif_start_queue(dev);

	return 0;
}

static int ep93xx_close(struct net_device *dev)
{
	struct ep93xx_priv *ep = netdev_priv(dev);

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

	wrl(ep, REG_GIINTMSK, 0);
	free_irq(ep->irq, dev);
	ep93xx_stop_hw(dev);
	ep93xx_free_buffers(ep);

	return 0;
}

static int ep93xx_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
	struct ep93xx_priv *ep = netdev_priv(dev);
	struct mii_ioctl_data *data = if_mii(ifr);

	return generic_mii_ioctl(&ep->mii, data, cmd, NULL);
}

static int ep93xx_mdio_read(struct net_device *dev, int phy_id, int reg)
{
	struct ep93xx_priv *ep = netdev_priv(dev);
	int data;
	int i;

	wrl(ep, REG_MIICMD, REG_MIICMD_READ | (phy_id << 5) | reg);

	for (i = 0; i < 10; i++) {
		if ((rdl(ep, REG_MIISTS) & REG_MIISTS_BUSY) == 0)
			break;
		msleep(1);
	}

	if (i == 10) {
		printk(KERN_INFO DRV_MODULE_NAME ": mdio read timed out\n");
		data = 0xffff;
	} else {
		data = rdl(ep, REG_MIIDATA);
	}

	return data;
}

static void ep93xx_mdio_write(struct net_device *dev, int phy_id, int reg, int data)
{
	struct ep93xx_priv *ep = netdev_priv(dev);
	int i;

	wrl(ep, REG_MIIDATA, data);
	wrl(ep, REG_MIICMD, REG_MIICMD_WRITE | (phy_id << 5) | reg);

	for (i = 0; i < 10; i++) {
		if ((rdl(ep, REG_MIISTS) & REG_MIISTS_BUSY) == 0)
			break;
		msleep(1);
	}

	if (i == 10)
		printk(KERN_INFO DRV_MODULE_NAME ": mdio write timed out\n");
}

static void ep93xx_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
{
	strcpy(info->driver, DRV_MODULE_NAME);
	strcpy(info->version, DRV_MODULE_VERSION);
}

static int ep93xx_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
	struct ep93xx_priv *ep = netdev_priv(dev);
	return mii_ethtool_gset(&ep->mii, cmd);
}

static int ep93xx_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
	struct ep93xx_priv *ep = netdev_priv(dev);
	return mii_ethtool_sset(&ep->mii, cmd);
}

static int ep93xx_nway_reset(struct net_device *dev)
{
	struct ep93xx_priv *ep = netdev_priv(dev);
	return mii_nway_restart(&ep->mii);
}

static u32 ep93xx_get_link(struct net_device *dev)
{
	struct ep93xx_priv *ep = netdev_priv(dev);
	return mii_link_ok(&ep->mii);
}

static struct ethtool_ops ep93xx_ethtool_ops = {
	.get_drvinfo		= ep93xx_get_drvinfo,
	.get_settings		= ep93xx_get_settings,
	.set_settings		= ep93xx_set_settings,
	.nway_reset		= ep93xx_nway_reset,
	.get_link		= ep93xx_get_link,
};

struct net_device *ep93xx_dev_alloc(struct ep93xx_eth_data *data)
{
	struct net_device *dev;

	dev = alloc_etherdev(sizeof(struct ep93xx_priv));
	if (dev == NULL)
		return NULL;

	memcpy(dev->dev_addr, data->dev_addr, ETH_ALEN);

	dev->get_stats = ep93xx_get_stats;
	dev->ethtool_ops = &ep93xx_ethtool_ops;
	dev->hard_start_xmit = ep93xx_xmit;
	dev->open = ep93xx_open;
	dev->stop = ep93xx_close;
	dev->do_ioctl = ep93xx_ioctl;

	dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM;

	return dev;
}


static int ep93xx_eth_remove(struct platform_device *pdev)
{
	struct net_device *dev;
	struct ep93xx_priv *ep;

	dev = platform_get_drvdata(pdev);
	if (dev == NULL)
		return 0;
	platform_set_drvdata(pdev, NULL);

	ep = netdev_priv(dev);

	/* @@@ Force down.  */
	unregister_netdev(dev);
	ep93xx_free_buffers(ep);

	if (ep->base_addr != NULL)
		iounmap(ep->base_addr);

	if (ep->res != NULL) {
		release_resource(ep->res);
		kfree(ep->res);
	}

	free_netdev(dev);

	return 0;
}

static int ep93xx_eth_probe(struct platform_device *pdev)
{
	struct ep93xx_eth_data *data;
	struct net_device *dev;
	struct ep93xx_priv *ep;
	int err;

	if (pdev == NULL)
		return -ENODEV;
	data = pdev->dev.platform_data;

	dev = ep93xx_dev_alloc(data);
	if (dev == NULL) {
		err = -ENOMEM;
		goto err_out;
	}
	ep = netdev_priv(dev);
	ep->dev = dev;
	netif_napi_add(dev, &ep->napi, ep93xx_poll, 64);

	platform_set_drvdata(pdev, dev);

	ep->res = request_mem_region(pdev->resource[0].start,
			pdev->resource[0].end - pdev->resource[0].start + 1,
			pdev->dev.bus_id);
	if (ep->res == NULL) {
		dev_err(&pdev->dev, "Could not reserve memory region\n");
		err = -ENOMEM;
		goto err_out;
	}

	ep->base_addr = ioremap(pdev->resource[0].start,
			pdev->resource[0].end - pdev->resource[0].start);
	if (ep->base_addr == NULL) {
		dev_err(&pdev->dev, "Failed to ioremap ethernet registers\n");
		err = -EIO;
		goto err_out;
	}
	ep->irq = pdev->resource[1].start;

	ep->mii.phy_id = data->phy_id;
	ep->mii.phy_id_mask = 0x1f;
	ep->mii.reg_num_mask = 0x1f;
	ep->mii.dev = dev;
	ep->mii.mdio_read = ep93xx_mdio_read;
	ep->mii.mdio_write = ep93xx_mdio_write;
	ep->mdc_divisor = 40;	/* Max HCLK 100 MHz, min MDIO clk 2.5 MHz.  */

	err = register_netdev(dev);
	if (err) {
		dev_err(&pdev->dev, "Failed to register netdev\n");
		goto err_out;
	}

	printk(KERN_INFO "%s: ep93xx on-chip ethernet, IRQ %d, "
			 "%.2x:%.2x:%.2x:%.2x:%.2x:%.2x.\n", dev->name,
			ep->irq, data->dev_addr[0], data->dev_addr[1],
			data->dev_addr[2], data->dev_addr[3],
			data->dev_addr[4], data->dev_addr[5]);

	return 0;

err_out:
	ep93xx_eth_remove(pdev);
	return err;
}


static struct platform_driver ep93xx_eth_driver = {
	.probe		= ep93xx_eth_probe,
	.remove		= ep93xx_eth_remove,
	.driver		= {
		.name	= "ep93xx-eth",
	},
};

static int __init ep93xx_eth_init_module(void)
{
	printk(KERN_INFO DRV_MODULE_NAME " version " DRV_MODULE_VERSION " loading\n");
	return platform_driver_register(&ep93xx_eth_driver);
}

static void __exit ep93xx_eth_cleanup_module(void)
{
	platform_driver_unregister(&ep93xx_eth_driver);
}

module_init(ep93xx_eth_init_module);
module_exit(ep93xx_eth_cleanup_module);
MODULE_LICENSE("GPL");