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Date: Fri, 16 Feb 2018 19:17:07 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Moritz Fischer <mdf@...nel.org>
Cc: linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
netdev@...r.kernel.org, robh+dt@...nel.org, mark.rutland@....com,
f.fainelli@...il.com, davem@...emloft.net
Subject: Re: [PATCH v3 2/2] net: ethernet: nixge: Add support for National
Instruments XGE netdev
On Fri, Feb 16, 2018 at 09:00:33AM -0800, Moritz Fischer wrote:
> +#define NIXGE_MDIO_CLAUSE45 BIT(12)
> +#define NIXGE_MDIO_CLAUSE22 0
> +#define NIXGE_MDIO_OP(n) (((n) & 0x3) << 10)
> +#define NIXGE_MDIO_OP_ADDRESS 0
> +#define NIXGE_MDIO_OP_WRITE BIT(0)
> +#define NIXGE_MDIO_OP_READ (BIT(1) | BIT(0))
> +#define MDIO_C22_WRITE BIT(0)
> +#define MDIO_C22_READ BIT(1)
> +#define MDIO_READ_POST 2
Hi Moritz
NIXGE prefix?
> +#define NIXGE_MDIO_ADDR(n) (((n) & 0x1f) << 5)
> +#define NIXGE_MDIO_MMD(n) (((n) & 0x1f) << 0)
> +
> +#define NIXGE_MAX_PHY_ADDR 32
This is nothing specific to this device. Please use the standard
PHY_MAX_ADDR.
> +static int nixge_open(struct net_device *ndev)
> +{
> + struct nixge_priv *priv = netdev_priv(ndev);
> + struct phy_device *phy;
> + int ret;
> +
> + nixge_device_reset(ndev);
> +
> + phy = of_phy_connect(ndev, priv->phy_node,
> + &nixge_handle_link_change, 0, priv->phy_mode);
> + if (!phy)
> + return -ENODEV;
> +
> + phy_start(phy);
> +
> + /* Enable tasklets for Axi DMA error handling */
> + tasklet_init(&priv->dma_err_tasklet, nixge_dma_err_handler,
> + (unsigned long)priv);
> +
> + napi_enable(&priv->napi);
> +
> + /* Enable interrupts for Axi DMA Tx */
> + ret = request_irq(priv->tx_irq, nixge_tx_irq, 0, ndev->name, ndev);
> + if (ret)
> + goto err_tx_irq;
> + /* Enable interrupts for Axi DMA Rx */
> + ret = request_irq(priv->rx_irq, nixge_rx_irq, 0, ndev->name, ndev);
> + if (ret)
> + goto err_rx_irq;
> +
> + netif_start_queue(ndev);
> +
> + return 0;
> +
> +err_rx_irq:
> + free_irq(priv->tx_irq, ndev);
> +err_tx_irq:
> + tasklet_kill(&priv->dma_err_tasklet);
> + netdev_err(ndev, "request_irq() failed\n");
> + return ret;
Maybe you also want to stop the phy and disconnect it?
> +static int nixge_stop(struct net_device *ndev)
> +{
> + struct nixge_priv *priv = netdev_priv(ndev);
> + u32 cr;
> +
> + netif_stop_queue(ndev);
> + napi_disable(&priv->napi);
> +
> + if (ndev->phydev)
> + phy_stop(ndev->phydev);
phy_disconnect() ?
> + cr = nixge_dma_read_reg(priv, XAXIDMA_RX_CR_OFFSET);
> + nixge_dma_write_reg(priv, XAXIDMA_RX_CR_OFFSET,
> + cr & (~XAXIDMA_CR_RUNSTOP_MASK));
> + cr = nixge_dma_read_reg(priv, XAXIDMA_TX_CR_OFFSET);
> + nixge_dma_write_reg(priv, XAXIDMA_TX_CR_OFFSET,
> + cr & (~XAXIDMA_CR_RUNSTOP_MASK));
> +
> + tasklet_kill(&priv->dma_err_tasklet);
> +
> + free_irq(priv->tx_irq, ndev);
> + free_irq(priv->rx_irq, ndev);
> +
> + nixge_hw_dma_bd_release(ndev);
> +
> + return 0;
> +}
> +static int nixge_mdio_read(struct mii_bus *bus, int phy_id, int reg)
> +{
> + struct nixge_priv *priv = bus->priv;
> + u32 status, tmp;
> + int err;
> + u16 device;
> +
> + if (reg & MII_ADDR_C45) {
> + device = (reg >> 16) & 0x1f;
> +
> + nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_ADDR, reg & 0xffff);
> +
> + tmp = NIXGE_MDIO_CLAUSE45 | NIXGE_MDIO_OP(NIXGE_MDIO_OP_ADDRESS)
> + | NIXGE_MDIO_ADDR(phy_id) | NIXGE_MDIO_MMD(device);
> +
> + nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_OP, tmp);
> + nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_CTRL, 1);
> +
> + err = nixge_ctrl_poll_timeout(priv, NIXGE_REG_MDIO_CTRL, status,
> + !status, 10, 1000);
> + if (err) {
> + dev_err(priv->dev, "timeout setting address");
> + return err;
> + }
> +
> + tmp = NIXGE_MDIO_CLAUSE45 | NIXGE_MDIO_OP(NIXGE_MDIO_OP_READ) |
> + NIXGE_MDIO_ADDR(phy_id) | NIXGE_MDIO_MMD(device);
> + } else {
> + device = reg & 0x1f;
> +
> + tmp = NIXGE_MDIO_CLAUSE22 | NIXGE_MDIO_OP(MDIO_C22_READ) |
> + NIXGE_MDIO_ADDR(phy_id) | NIXGE_MDIO_MMD(device);
It would be nice to have some naming consistency here. NIXGE_MDIO_C45_READ and
NIXGE_MDIO_C22_READ?
> + }
> +
> + nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_OP, tmp);
> + nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_CTRL, 1);
> +
> + err = nixge_ctrl_poll_timeout(priv, NIXGE_REG_MDIO_CTRL, status,
> + !status, 10, 1000);
> + if (err) {
> + dev_err(priv->dev, "timeout setting read command");
> + return err;
> + }
> +
> + status = nixge_ctrl_read_reg(priv, NIXGE_REG_MDIO_DATA);
> +
> + return status;
> +}
> +
> +static int nixge_mdio_setup(struct nixge_priv *priv, struct device_node *np)
> +{
> + struct mii_bus *bus;
> + int err;
> +
> + bus = mdiobus_alloc();
devm_mdiobus_alloc() ?
> + if (!bus)
> + return -ENOMEM;
> +
> + snprintf(bus->id, MII_BUS_ID_SIZE, "%s-mii", dev_name(priv->dev));
> + bus->priv = priv;
> + bus->name = "nixge_mii_bus";
> + bus->read = nixge_mdio_read;
> + bus->write = nixge_mdio_write;
> + bus->parent = priv->dev;
> +
> + priv->mii_bus = bus;
> + err = of_mdiobus_register(bus, np);
> + if (err)
> + goto err_register;
> +
> + return 0;
> +
> +err_register:
> + mdiobus_free(bus);
> + return err;
> +}
> +static int nixge_remove(struct platform_device *pdev)
> +{
> + struct net_device *ndev = platform_get_drvdata(pdev);
> + struct nixge_priv *priv = netdev_priv(ndev);
> +
> + mdiobus_unregister(priv->mii_bus);
> + mdiobus_free(priv->mii_bus);
> +
> + unregister_netdev(ndev);
I'm not sure about the ordering here. It might be better to unregister
the netdev, then destroy the MDIO bus.
> +
> + free_netdev(ndev);
> +
> + return 0;
> +}
Andrew
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