am335x系統升級之kernel ethernet(四)
阿新 • • 發佈：2018-11-23
目前linux驅動開發主要在於dts檔案的開發，幾乎所有的驅動都是現成的，
關鍵在於三點：
1） 瞭解硬體的介面
2） 知道如何初始化硬體
3） 如何通過dts傳遞所需要的資訊
關於網絡卡首先得知道phy地址，時鐘用的是外部時鐘，介面用的是RMII介面，管腳需要做相關的初始化，預設ti cpsw網絡卡控制器
需要做初始化，相應的ksz8081驅動需要選上就可以在上層通過ifconfig 檢視到eth0.
第一：引變初始化
Index: am335x-evm.dts
===================================================================
--- am335x-evm.dts (revision 12)
+++ am335x-evm.dts (revision 13)
@@ -252,19 +252,15 @@
cpsw_default: cpsw_default {
pinctrl-single,pins = <
- /* Slave 1 */
- AM33XX_IOPAD(0x914, PIN_OUTPUT_PULLDOWN | MUX_MODE2) /* mii1_txen.rgmii1_tctl */
- AM33XX_IOPAD(0x918, PIN_INPUT_PULLDOWN | MUX_MODE2) /* mii1_rxdv.rgmii1_rctl */
- AM33XX_IOPAD(0x91c, PIN_OUTPUT_PULLDOWN | MUX_MODE2) /* mii1_txd3.rgmii1_td3 */
- AM33XX_IOPAD(0x920, PIN_OUTPUT_PULLDOWN | MUX_MODE2) /* mii1_txd2.rgmii1_td2 */
- AM33XX_IOPAD(0x924, PIN_OUTPUT_PULLDOWN | MUX_MODE2) /* mii1_txd1.rgmii1_td1 */
- AM33XX_IOPAD(0x928, PIN_OUTPUT_PULLDOWN | MUX_MODE2) /* mii1_txd0.rgmii1_td0 */
- AM33XX_IOPAD(0x92c, PIN_OUTPUT_PULLDOWN | MUX_MODE2) /* mii1_txclk.rgmii1_tclk */
- AM33XX_IOPAD(0x930, PIN_INPUT_PULLDOWN | MUX_MODE2) /* mii1_rxclk.rgmii1_rclk */
- AM33XX_IOPAD(0x934, PIN_INPUT_PULLDOWN | MUX_MODE2) /* mii1_rxd3.rgmii1_rd3 */
- AM33XX_IOPAD(0x938, PIN_INPUT_PULLDOWN | MUX_MODE2) /* mii1_rxd2.rgmii1_rd2 */
- AM33XX_IOPAD(0x93c, PIN_INPUT_PULLDOWN | MUX_MODE2) /* mii1_rxd1.rgmii1_rd1 */
- AM33XX_IOPAD(0x940, PIN_INPUT_PULLDOWN | MUX_MODE2) /* mii1_rxd0.rgmii1_rd0 */
+ /* Slave 1, RMII mode */
+ AM33XX_IOPAD(0x90c, (PIN_INPUT_PULLUP | MUX_MODE1)) /* mii1_crs.rmii1_crs_dv */
+ AM33XX_IOPAD(0x944, (PIN_INPUT_PULLUP | MUX_MODE0)) /* rmii1_refclk.rmii1_refclk */
+ AM33XX_IOPAD(0x940, (PIN_INPUT_PULLUP | MUX_MODE1)) /* mii1_rxd0.rmii1_rxd0 */
+ AM33XX_IOPAD(0x93c, (PIN_INPUT_PULLUP | MUX_MODE1)) /* mii1_rxd1.rmii1_rxd1 */
+ AM33XX_IOPAD(0x910, (PIN_INPUT_PULLUP | MUX_MODE1)) /* mii1_rxerr.rmii1_rxerr */
+ AM33XX_IOPAD(0x928, (PIN_OUTPUT_PULLDOWN | MUX_MODE1)) /* mii1_txd0.rmii1_txd0 */
+ AM33XX_IOPAD(0x924, (PIN_OUTPUT_PULLDOWN | MUX_MODE1)) /* mii1_txd1.rmii1_txd1 */
+ AM33XX_IOPAD(0x914, (PIN_OUTPUT_PULLDOWN | MUX_MODE1)) /* mii1_txen.rmii1_txen */
>;
};
@@ -271,18 +267,14 @@
cpsw_sleep: cpsw_sleep {
pinctrl-single,pins = <
/* Slave 1 reset value */
- AM33XX_IOPAD(0x914, PIN_INPUT_PULLDOWN | MUX_MODE7)
- AM33XX_IOPAD(0x918, PIN_INPUT_PULLDOWN | MUX_MODE7)
- AM33XX_IOPAD(0x91c, PIN_INPUT_PULLDOWN | MUX_MODE7)
- AM33XX_IOPAD(0x920, PIN_INPUT_PULLDOWN | MUX_MODE7)
- AM33XX_IOPAD(0x924, PIN_INPUT_PULLDOWN | MUX_MODE7)
- AM33XX_IOPAD(0x928, PIN_INPUT_PULLDOWN | MUX_MODE7)
- AM33XX_IOPAD(0x92c, PIN_INPUT_PULLDOWN | MUX_MODE7)
- AM33XX_IOPAD(0x930, PIN_INPUT_PULLDOWN | MUX_MODE7)
- AM33XX_IOPAD(0x934, PIN_INPUT_PULLDOWN | MUX_MODE7)
- AM33XX_IOPAD(0x938, PIN_INPUT_PULLDOWN | MUX_MODE7)
- AM33XX_IOPAD(0x93c, PIN_INPUT_PULLDOWN | MUX_MODE7)
- AM33XX_IOPAD(0x940, PIN_INPUT_PULLDOWN | MUX_MODE7)
+ AM33XX_IOPAD(0x90c, (PIN_INPUT_PULLDOWN | MUX_MODE7))
+ AM33XX_IOPAD(0x944, (PIN_INPUT_PULLDOWN | MUX_MODE7))
+ AM33XX_IOPAD(0x940, (PIN_INPUT_PULLDOWN | MUX_MODE7))
+ AM33XX_IOPAD(0x93c, (PIN_INPUT_PULLDOWN | MUX_MODE7))
+ AM33XX_IOPAD(0x910, (PIN_INPUT_PULLDOWN | MUX_MODE7))
+ AM33XX_IOPAD(0x928, (PIN_INPUT_PULLDOWN | MUX_MODE7))
+ AM33XX_IOPAD(0x924, (PIN_INPUT_PULLDOWN | MUX_MODE7))
+ AM33XX_IOPAD(0x914, (PIN_INPUT_PULLDOWN | MUX_MODE7))
>;
};
@@ -725,14 +717,9 @@
第二：phy id 為 0 ，不做改動。
&cpsw_emac0 {
phy_id = <&davinci_mdio>, <0>;
- phy-mode = "rgmii-txid";
第三：介面為rmii故需要修改phy的連線模式
+ phy-mode = "rmii";
};
-&cpsw_emac1 {
- phy_id = <&davinci_mdio>, <1>;
- phy-mode = "rgmii-txid";
-};
-
&tscadc {
status = "okay";
tsc {
第四： 確認預設的網絡卡控制器驅動及網絡卡驅動已勾選上之後。
重新編譯核心，測試可以發現系統可正常發現第一張網絡卡