UM0851 datasheet(58/245 Pages) STMICROELECTRONICS

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Communication device drivers

UM0851

58/245

Doc ID 16604 Rev 2

struct macb* bp = netdev_priv(dev);

The MACB driver interfaces to the kernel via the struct net_device data structure. The

structure fields are initialized to provide the necessary interface. The below code is a fairly

routine initialization of the struct net_device structure; it is mostly a matter of storing pointers

to our various driver functions.

struct net_device *dev;

dev->open = macb_open;

dev->stop = macb_close;

dev->do_ioctl = macb_ioctl;

dev->get_stats = macb_get_stats;

dev->hard_start_xmit = macb_start_xmit;

dev->set_multicast_list = macb_set_rx_mode;

dev->dev_addr[0-5] = MAC ADDRESS;

/*The private data structure use by the driver is */

struct macb {

void __iomem

*regs;

unsigned int

rx_tail;

struct dma_des

*rx_ring;

void

*rx_buffers;

unsigned int

tx_head, tx_tail;

unsigned int

lasttx_base;

struct dma_desc

*tx_ring;

struct ring_info

*tx_skb;

spinlock_t

lock;

struct platform_device

*pdev;

struct net_device

*dev;

struct net_device_stats stats;

struct macb_stats

hw_stats;

dma_addr_t

rx_ring_dma;

dma_addr_t

tx_ring_dma;

dma_addr_t

rx_buffers_dma;

unsigned int

rx_pending, tx_pending;

struct mii_bus

mii_bus;

struct mii_if_info

mii;

struct phy_device

*phy_dev;

unsigned int

link;

unsigned int

speed;

unsigned int

duplex;

};

PHY framework for SPEAr MACB

In the MACB driver, there is a top layer (drivers/net/arm/macb_top.c) whose function is to

scan all the PHY chips and to assign each of them to the corresponding MACB drivers.

After scanning and verifying all the PHY chips, the top layer driver creates four (or a different

number of) platform devices, which matches the MACB platform drivers. The platform

contains the struct phy_device and its corresponding MACB base register address.

The code below is in the top layer driver driver/net/arm/macb_top.c

/* register MDIO bus of MACB */

bp->mii_bus.name = "MACB_mii_bus";bp->mii_bus.read = &macb_mdio_read;bp-

>mii_bus.write = &macb_mdio_write;bp->mii_bus.reset = &macb_mdio_reset;bp-

>mii_bus.id = bp->pdev->id;

UM0851 Datasheet(PDF) 58 Page - STMicroelectronics

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