LS1012的网络初始化解析
简单梳理一下LS1012开发板的Uboot阶段网络初始化过程
在文件：
OK10xx-linux-fs/flexbuild/packages/firmware/u-boot/include/net/pfe_eth/pfe_eth.h首先定义了我们所需要的三个结构体：
struct gemac_s {
void *gemac_base;
void *egpi_base;
/* GEMAC config */
int gemac_mode;
int gemac_speed;
int gemac_duplex;
int flags;
/* phy iface */
int phy_address;
int phy_mode;
struct mii_dev *bus;
};
struct pfe_mdio_info {
void *reg_base;
char *name;
};
struct pfe_eth_dev {
int gemac_port;
struct gemac_s *gem;
struct pfe_ddr_address pfe_addr;
struct udevice *dev;
#ifdef CONFIG_PHYLIB
struct phy_device *phydev;
#endif
};在文件：
OK10xx-linux-fs/flexbuild/packages/firmware/u-boot/drivers/net/pfe_eth/pfe_eth.c创建了两个gem_info结构体：
struct gemac_s gem_info[] = {
/* PORT_0 configuration */
{
/* GEMAC config */
.gemac_speed = PFE_MAC_SPEED_1000M,
.gemac_duplex = DUPLEX_FULL,
/* phy iface */
.phy_address = CONFIG_PFE_EMAC1_PHY_ADDR,
.phy_mode = PHY_INTERFACE_MODE_SGMII,
},
/* PORT_1 configuration */
{
/* GEMAC config */
.gemac_speed = PFE_MAC_SPEED_1000M,
.gemac_duplex = DUPLEX_FULL,
/* phy iface */
.phy_address = CONFIG_PFE_EMAC2_PHY_ADDR,
.phy_mode = PHY_INTERFACE_MODE_SGMII,
},
};分别是两个mac的速率，全双工还是半双工，对应连接的PHY的地址和工作模式
之后在同文件下的pfe_eth_probe(struct udevice *dev)函数中有：
static int pfe_eth_probe(struct udevice *dev)
{
struct pfe_eth_dev *priv = dev_get_priv(dev);
struct pfe_ddr_address *pfe_addr;
struct pfe_eth_pdata *pdata = dev_get_platdata(dev);
...
priv->gemac_port = pdata->pfe_eth_pdata_mac.phy_interface;
priv->gem = &gem_info[priv->gemac_port];
priv->dev = dev;
switch (priv->gemac_port) {
case EMAC_PORT_0:
default:
priv->gem->gemac_base = EMAC1_BASE_ADDR;
priv->gem->egpi_base = EGPI1_BASE_ADDR;
break;
case EMAC_PORT_1:
priv->gem->gemac_base = EMAC2_BASE_ADDR;
priv->gem->egpi_base = EGPI2_BASE_ADDR;
break;
}
ret = pfe_eth_board_init(dev);
if (ret)
return ret;
#if defined(CONFIG_PHYLIB)
ret = pfe_phy_configure(priv, pdata->pfe_eth_pdata_mac.phy_interface, gem_info[priv->gemac_port].phy_address);
#endif
return ret;
}probe函数中，首先获得了pfe设备的私有属性：dev_get_priv(dev);，并放到了priv中。
其次获得了pfe设备的平台信息：dev_get_platdata(dev);，并放到了pdata中。
然后取出平台信息中的一部分信息填充私有属性priv结构体。
将gem_info填充进priv结构体的gem结构中，同时填充gem结构的其他属性，比如MAC的基地址信息等。
之后进行pfe设备的初始化操作，生成网络设备：pfe_eth_board_init(dev);
最后再调用pfe_phy_configure函数进行mac的配置。
关于pfe_eth_board_init函数，在文件
OK10xx-linux-fs/flexbuild/packages/firmware/u-boot/board/freescale/ls1012ardb/eth.c在函数pfe_eth_board_init(dev)中有
int pfe_eth_board_init(struct udevice *dev)
{
static int init_done;
struct mii_dev *bus;
struct pfe_mdio_info mac_mdio_info;
struct pfe_eth_dev *priv = dev_get_priv(dev);
struct ccsr_gur __iomem *gur = (void *)CONFIG_SYS_FSL_GUTS_ADDR;
int srds_s1 = in_be32(&gur->rcwsr[4]) &
FSL_CHASSIS2_RCWSR4_SRDS1_PRTCL_MASK;
srds_s1 >>= FSL_CHASSIS2_RCWSR4_SRDS1_PRTCL_SHIFT;
if (!init_done) {
ls1012ardb_reset_phy();
mac_mdio_info.reg_base = (void *)EMAC1_BASE_ADDR;
mac_mdio_info.name = DEFAULT_PFE_MDIO_NAME;
bus = pfe_mdio_init(&mac_mdio_info);
if (!bus) {
printf("Failed to register mdio\n");
return -1;
}
init_done = 1;
}
if (priv->gemac_port) {
mac_mdio_info.reg_base = (void *)EMAC2_BASE_ADDR;
mac_mdio_info.name = DEFAULT_PFE_MDIO1_NAME;
bus = pfe_mdio_init(&mac_mdio_info);
if (!bus) {
printf("Failed to register mdio\n");
return -1;
}
}
pfe_set_mdio(priv->gemac_port,
miiphy_get_dev_by_name(DEFAULT_PFE_MDIO_NAME));
switch (srds_s1) {
case 0x3305:
if (!priv->gemac_port) {
/* MAC1 */
pfe_set_phy_address_mode(priv->gemac_port,
CONFIG_PFE_EMAC1_PHY_ADDR,
PHY_INTERFACE_MODE_SGMII);
} else {
/* MAC2 */
pfe_set_phy_address_mode(priv->gemac_port,
CONFIG_PFE_EMAC2_PHY_ADDR,
PHY_INTERFACE_MODE_SGMII);
}
break;
default:
printf("unsupported SerDes PRCTL= %d\n", srds_s1);
break;
}
return 0;
}此函数分别对两个mdio设备进行初始化，包括对mac_mdio_info结构体填充对应MAC的基地址和名称，并调用pfe_mdio_init进行初始化。
在文件
OK10xx-linux-fs/flexbuild/packages/firmware/u-boot/drivers/net/pfe_eth/pfe_mdio.c在函数*pfe_mdio_init(struct pfe_mdio_info *mdio_info)中有：
struct mii_dev *pfe_mdio_init(struct pfe_mdio_info *mdio_info)
{
struct mii_dev *bus;
int ret;
u32 mdio_speed;
u32 pclk = 250000000;
bus = mdio_alloc();
if (!bus) {
printf("mdio_alloc failed\n");
return NULL;
}
bus->read = pfe_phy_read;
bus->write = pfe_phy_write;
/* MAC1 MDIO used to communicate with external PHYS */
bus->priv = mdio_info->reg_base;
sprintf(bus->name, mdio_info->name);
/* configure mdio speed */
mdio_speed = (DIV_ROUND_UP(pclk, 4000000) << EMAC_MII_SPEED_SHIFT);
mdio_speed = EMAC_HOLDTIME(0x5);
writel(mdio_speed, mdio_info->reg_base + EMAC_MII_CTRL_REG);
ret = mdio_register(bus);
if (ret) {
printf("mdio_register failed\n");
free(bus);
return NULL;
}
return bus;
}此函数主要为对mdio的速率进行设置
关于pfe_phy_configure函数，在文件
OK10xx-linux-fs/flexbuild/packages/firmware/u-boot/drivers/net/pfe_eth/pfe_mdio.c在函数pfe_phy_configure(struct pfe_eth_dev *priv, int dev_id, int phy_id)中有：
int pfe_phy_configure(struct pfe_eth_dev *priv, int dev_id, int phy_id)
{
struct phy_device *phydev = NULL;
struct udevice *dev = priv->dev;
struct gemac_s *gem = priv->gem;
struct ccsr_scfg *scfg = (struct ccsr_scfg *)CONFIG_SYS_FSL_SCFG_ADDR;
if (!gem->bus)
return -1;
/* Configure SGMII PCS */
if (gem->phy_mode == PHY_INTERFACE_MODE_SGMII
gem->phy_mode == PHY_INTERFACE_MODE_SGMII_2500) {
out_be32(&scfg->mdioselcr, 0x00000000);
pfe_configure_serdes(priv);
}
mdelay(100);
/* By this time on-chip SGMII initialization is done
* we can switch mdio interface to external PHYs
*/
out_be32(&scfg->mdioselcr, 0x80000000);
phydev = phy_connect(gem->bus, phy_id, dev, gem->phy_mode);
if (!phydev) {
printf("phy_connect failed\n");
return -ENODEV;
}
phy_config(phydev);
priv->phydev = phydev;
return 0;
}此函数主要负责通过两个MDIO接口对各个MDIO所连接的MAC进行【SGMII PCS】的配置，使之工作在SGMII模式下，然后在SGMII初始化成功之后，将MDIO配置为外部PHY连接模式。
补充：在ls1012中，有两个MDIO接口，其中MDIO1连接MAC1的 SGMII PCS和外部PHY，MDIO2连接MAC2的SGMII PCS