UM0851 datasheet(45/245 Pages) STMICROELECTRONICS

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UM0851

Communication device drivers

Doc ID 16604 Rev 2

45/245

Figure 8.

GMAC Ethernet software architecture

4.1.3

GMAC API

The following sections describe the GMA API.

Device registration

The GMAC driver inserts a data structure for each newly detected interface into a global list

of network devices.

Each interface is described by a struct net_device item, which is defined in

<linux/netdevice.h>. The structure must be allocated dynamically. The kernel function

provided to perform this allocation is alloc_etherdev(), which has the following prototype:

struct net_device *alloc_etherdev(int sizeof_priv);

/* Here, sizeof_priv is the size of the SPEAr MAC driver's "private data" area. Once

the net_device structure has been initialized, the process of registration is

complete by passing the structure to register_netdev().The access to the SPEAr GMAC

private data is done via standard call provided by kernel

struct spear_eth_priv priv = netdev_priv(dev);

The GMAC driver interacts with the kernel via the struct net_device data structure. The

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

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

to the various functions of the driver.

struct net_device *dev;

dev->open = spear_eth_open;

dev->stop = spear_eth_stop;

dev->do_ioctl = spear_eth_ioctl;

dev->get_stats = spear_eth_get_stats;

dev->tx_timeout = spear_eth_tx_timeout;

Application

Socket API

TCP/IP stack

Netif I/F

GMAC controller

Hardware

Kernel space

User space

GMAC Ethernet driver

Eth Phy

GMII/MII

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