Network device support --->
Ethernet driver support --->
Texas Instruments (TI) devices
-*- TI DaVinci MDIO Support
-*- TI DaVinci CPDMA Support
<*> TI CPSW Switch Support
[] TI CPSW Switch as Dual EMAC
-*- PHY Device support and infrastructure --->
<*> Drivers for SMSC PHYs
2.引脚初始化 打开板级初始化文件 arch/arm/mach-omap2/board-com335x.c,增加以下内容:
/* Module pin mux for rmii1 */
static struct pinmux_config rmii1_pin_mux[] = {
{"mii1_crs.rmii1_crs_dv", OMAP_MUX_MODE1 | AM33XX_PIN_INPUT_PULLDOWN},
{"mii1_rxerr.mii1_rxerr", OMAP_MUX_MODE1 | AM33XX_PIN_INPUT_PULLDOWN},
{"mii1_txen.mii1_txen", OMAP_MUX_MODE1 | AM33XX_PIN_OUTPUT},
{"mii1_txd1.mii1_txd1", OMAP_MUX_MODE1 | AM33XX_PIN_OUTPUT},
{"mii1_txd0.mii1_txd0", OMAP_MUX_MODE1 | AM33XX_PIN_OUTPUT},
{"mii1_rxd1.mii1_rxd1", OMAP_MUX_MODE1 | AM33XX_PIN_INPUT_PULLDOWN},
{"mii1_rxd0.mii1_rxd0", OMAP_MUX_MODE1 | AM33XX_PIN_INPUT_PULLDOWN},
{"rmii1_refclk.rmii1_refclk", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLDOWN},
{"mdio_data.mdio_data", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"mdio_clk.mdio_clk", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT_PULLUP},
{NULL, 0},
};
注意:引脚不要被其它功能复用!
3.驱动初始化 在 board-com335x.c 文件的 com335x_eth_init(void)函数中,做以下修改:
static void com335x_eth_init(void)
{
setup_pin_mux(rmii1_pin_mux);
am33xx_cpsw_init(AM33XX_CPSW_MODE_RMII, "0:00", NULL);
// int ret = phy_register_fixup_for_uid(COM335X_EVM_PHY_ID, COM335X_PHY_MASK,
am33xx_tx_clk_dly_phy_fixup);
}
注: am33xx_cpsw_init(AM33XX_CPSW_MODE_RMII, "0:00", NULL)里的第一个参数为指定 RMII 模
式,第二个参数为 rmii1 接口上的 phy_addr,第三个参数为 rmii2 接口上的 phy_addr。修改完成后,保存文
件。
在上一节提到,我们的设计中, rmii_refclk 信号由 phy 芯片提供,因此需要使能 rmii1_refclk 为输入,
打开 arch/arm/mach-omap2/devices.c 文件,在 am33xx_cpsw_init 函数中,增加以下内容:
int am33xx_cpsw_init(enum am33xx_cpsw_mac_mode mode, unsigned char *phy_id0,
unsigned char *phy_id1)
{
......
#define RMII1_IO_CLK_EN 1 << 6
gmii_sel |= (RMII1_IO_CLK_EN);
writel(gmii_sel, AM33XX_CTRL_REGADDR(AM33XX_CONTROL_GMII_SEL_OFFSET));
......
}
修改完成后,保存退出。重新编译系统即可。
三、kernel里如何修改phy(双网络,rmii1、rmii2接口)
1.内核配置 Device Drivers --->
Network device support --->
Ethernet driver support --->
Texas Instruments (TI) devices
-*- TI DaVinci MDIO Support
-*- TI DaVinci CPDMA Support
<*> TI CPSW Switch Support
TI CPSW Switch as Dual EMAC
-*- PHY Device support and infrastructure --->
<*> Drivers for SMSC PHYs
2.引脚初始化 打开板级初始化文件 arch/arm/mach-omap2/board-com335x.c,增加以下内容:
/* Module pin mux for rmii1 */
static struct pinmux_config rmii1_pin_mux[] = {
{"mii1_crs.rmii1_crs_dv", OMAP_MUX_MODE1 | AM33XX_PIN_INPUT_PULLDOWN},
{"mii1_rxerr.mii1_rxerr", OMAP_MUX_MODE1 | AM33XX_PIN_INPUT_PULLDOWN},
{"mii1_txen.mii1_txen", OMAP_MUX_MODE1 | AM33XX_PIN_OUTPUT},
{"mii1_txd1.mii1_txd1", OMAP_MUX_MODE1 | AM33XX_PIN_OUTPUT},
{"mii1_txd0.mii1_txd0", OMAP_MUX_MODE1 | AM33XX_PIN_OUTPUT},
{"mii1_rxd1.mii1_rxd1", OMAP_MUX_MODE1 | AM33XX_PIN_INPUT_PULLDOWN},
{"mii1_rxd0.mii1_rxd0", OMAP_MUX_MODE1 | AM33XX_PIN_INPUT_PULLDOWN},
{"rmii1_refclk.rmii1_refclk", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLDOWN},
{"mdio_data.mdio_data", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"mdio_clk.mdio_clk", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT_PULLUP},
{NULL, 0},
};
/* Module pin mux for rmii2 */
static struct pinmux_config rmii2_pin_mux[] = {
{"gpmc_csn3.rmii2_crs_dv", OMAP_MUX_MODE2 | AM33XX_PIN_INPUT_PULLDOWN},
// {"gpmc_wpn.rmii2_rxerr", OMAP_MUX_MODE3 | AM33XX_PIN_INPUT_PULLDOWN},
{"gpmc_a0.rmii2_txen", OMAP_MUX_MODE3 | AM33XX_PIN_OUTPUT},
{"gpmc_a4.rmii2_txd1", OMAP_MUX_MODE3 | AM33XX_PIN_OUTPUT},
{"gpmc_a5.rmii2_txd0", OMAP_MUX_MODE3 | AM33XX_PIN_OUTPUT},
{"gpmc_a10.rmii2_rxd1", OMAP_MUX_MODE3 | AM33XX_PIN_INPUT_PULLDOWN},
{"gpmc_a11.rmii2_rxd0", OMAP_MUX_MODE3 | AM33XX_PIN_INPUT_PULLDOWN},
{"mii1_col.rmii2_refclk", OMAP_MUX_MODE1 | AM33XX_PIN_INPUT_PULLDOWN},
{"mdio_data.mdio_data", OMAP_MUX_MODE0 | AM33XX_PIN_INPUT_PULLUP},
{"mdio_clk.mdio_clk", OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT_PULLUP},
{NULL, 0},
};
注意:引脚不要被其它功能复用!另外,根据底板设计手册,在 rmii2 接口中,由于 rmii2_rxerr 脚已
经被 gpmc 使用,因此 rmii2_rxerr 未与 LAN8720 连接,经测试,未发现此情况下对网络有影响。
3.驱动初始化 在 board-com335x.c 文件的 com335x_eth_init(void)函数中,做以下修改:
static void com335x_eth_init(void)
{
setup_pin_mux(rmii1_pin_mux);
setup_pin_mux(rmii2_pin_mux);
am33xx_cpsw_init(AM33XX_CPSW_MODE_RMII, "0:00", "0:01");
// int ret = phy_register_fixup_for_uid(COM335X_EVM_PHY_ID, COM335X_PHY_MASK,
am33xx_tx_clk_dly_phy_fixup);
}
注:详细说明请参考上一节。修改完成后,保存文件。
使能 rmii1_refclk、 rmii2_refclk 为输入(参考上一节),打开 arch/arm/mach-omap2/devices.c 文件,在
am33xx_cpsw_init 函数中,增加以下内容:
int am33xx_cpsw_init(enum am33xx_cpsw_mac_mode mode, unsigned char *phy_id0,
unsigned char *phy_id1)
{
......
#define RMII1_IO_CLK_EN 1 << 6
#define RMII2_IO_CLK_EN 1 << 7
gmii_sel |= (RMII1_IO_CLK_EN);
writel(gmii_sel, AM33XX_CTRL_REGADDR(AM33XX_CONTROL_GMII_SEL_OFFSET));
......
}
修改完成后,保存退出。重新编译系统即可。
4.双网络使用说明 将上述步骤编译的内核烧录到 COM335X,系统启动后,在终端输入 ifconfig -a 命令可以查看到 eth0
和 eth1 两个设备。如需同时使用 eth0 和 eth1,必须注意两者不能在同一网段! |
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