在RT-Thread下为MPU手搓以太网MAC驱动-2

本文主要是介绍在RT-Thread下为MPU手搓以太网MAC驱动-2，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

文章目录

- MAC驱动兼容不同的MPU平台
- - MAC驱动中断处理代码
  - MAC驱动下MDIO访问接口的实现
- MAC驱动支持不同的PHY芯片
- - 对PHY设备的抽象

这是个人驱动开发过程中做的一些记录，仅代表个人意见和理解，不喜勿喷

MAC驱动需要兼容不同的MPU平台

MAC驱动兼容不同的MPU平台

MAC驱动中断处理代码

在MAC驱动下，提供了通用的中断处理代码，在通用中断处理代码下会调用每个MAC驱动实际注册的中断处理函数：

static void h3_macplib_interrupt(int vector, void *param)
{struct h3_macplib_dev *macplib_dev;RT_ASSERT(param != RT_NULL);macplib_dev = (struct h3_macplib_dev *)param;RT_ASSERT((int)macplib_dev->irqnum == vector);macplib_dev->mac_ops->macdev_interrupt(&macplib_dev->mac_dev);
}

MAC驱动在向RT-Thread注册network device时，所提供的初始化接口的实现：

static rt_err_t h3_macplib_initial(rt_device_t dev)
{struct mac_async_filter filter = {0};struct h3_macplib_dev *macplib_dev;macplib_dev = (struct h3_macplib_dev *)dev->user_data;RT_ASSERT(macplib_dev != RT_NULL);/* Disable GMAC interrupt and register IRQ handler */rt_hw_interrupt_mask(macplib_dev->irqnum);rt_hw_interrupt_install(macplib_dev->irqnum, h3_macplib_interrupt,(void *)macplib_dev, macplib_dev->name);/* Device is ready to work after final initialization */macplib_dev->mac_ops->macdev_init(&macplib_dev->mac_dev,(void *)macplib_dev->regs);/* Register frame RX callback function to notify Ethernet driver */macplib_dev->mac_ops->macdev_register(&macplib_dev->mac_dev,MAC_ASYNC_RECEIVE_CB,h3_macplib_rxcallback);/* set MAC hardware address */memcpy(filter.mac, macplib_dev->mac_addr, 6);filter.tid_enable = false;macplib_dev->mac_ops->macdev_filter(&macplib_dev->mac_dev, 0, &filter);/* Enable GMAC device */macplib_dev->mac_ops->macdev_enable(&macplib_dev->mac_dev);/* The last should enable GMAC interrupt handler */rt_hw_interrupt_umask(macplib_dev->irqnum);return RT_EOK;
}

MAC驱动下MDIO访问接口的实现

在定义MAC驱动操作接口的抽象时，就有定义PHY的寄存器读写接口，而MDIO操作PHY寄存器时就需要用到MAC操作接口所提供的PHY读写接口：

/* RT-Thread MDIO bus operation */
static struct rt_mdio_bus_ops h3_mdiobus_ops =
{.init   = h3_mdioplib_init,.read   = h3_mdioplib_read,.write  = h3_mdioplib_write,.uninit = RT_NULL,
};

MDIO操作接口读取接口的代码实现：

static rt_size_t h3_mdioplib_read(void *bus, rt_uint32_t addr,rt_uint32_t reg, void *data, rt_uint32_t size)
{rt_uint16_t val;rt_uint32_t *data_ptr = (rt_uint32_t *)data;struct h3_macplib_dev *macplib_dev;struct rt_mdio_bus    *mdioplib_bus = (struct rt_mdio_bus *)bus;RT_ASSERT(data != NULL);RT_ASSERT(bus  != NULL);if (4 != size) {return 0;}macplib_dev = (struct h3_macplib_dev *)mdioplib_bus->hw_obj;macplib_dev->mac_ops->macdev_readphy(&macplib_dev->mac_dev,(rt_uint16_t)addr, (rt_uint16_t)reg,&val);/* Get data from MII register. */*data_ptr = (rt_uint32_t)val;return 4;
}

那到这里的话，整个MAC驱动中最重要的部分已经完成，接下来将介绍PHY驱动代码的实现。

MAC驱动需要支持不同的PHY芯片

MAC驱动支持不同的PHY芯片

对PHY设备的抽象

需要对PHY设备做出抽象，不同的MPU产品中会存在MAC接口外接不同的PHY芯片，那在我们系统中每个PHY芯片就会有对应数量的PHY设备实例：

struct h3_kszplib_dev
{const char    *name;uint32_t       phy_addr;struct rt_phy_device rt_phydev;
} ;

RT-Thread下对PHY设备的操作接口做出抽象，在编写MAC驱动的时候，也需要完成对PHY设备操作接口的实现：

struct rt_phy_ops
{rt_phy_status (*init)(void *object, rt_uint32_t phy_addr, rt_uint32_t src_clock_hz);rt_phy_status (*read)(rt_uint32_t reg, rt_uint32_t *data);rt_phy_status (*write)(rt_uint32_t reg, rt_uint32_t data);rt_phy_status (*loopback)(rt_uint32_t mode, rt_uint32_t speed, rt_bool_t enable);rt_phy_status (*get_link_status)(rt_bool_t *status);rt_phy_status (*get_link_speed_duplex)(rt_uint32_t *speed, rt_uint32_t *duplex);
};