linux DSA 開發(fā)上手筆記(一)

與 DSA 相關(guān)的代碼

./net/dsa/* ./drivers/net/dsa/*

./net/dsa/Kconfig

# net/dsa/Kconfig 里面主要定義了以下CONFIG選項(xiàng) NET_DSA NET_DSA_TAG_8021Q NET_DSA_TAG_xxx

./net/dsa/Makefile

# SPDX-License-Identifier: GPL-2.0 # the core obj-$(CONFIG_NET_DSA) += dsa_core.o dsa_core-y += dsa.o dsa2.o master.o port.o slave.o switch.o# tagging formats obj-$(CONFIG_NET_DSA_TAG_8021Q) += tag_8021q.o obj-$(CONFIG_NET_DSA_TAG_BRCM_COMMON) += tag_brcm.o obj-$(CONFIG_NET_DSA_TAG_DSA) += tag_dsa.o obj-$(CONFIG_NET_DSA_TAG_EDSA) += tag_edsa.o obj-$(CONFIG_NET_DSA_TAG_GSWIP) += tag_gswip.o obj-$(CONFIG_NET_DSA_TAG_KSZ) += tag_ksz.o obj-$(CONFIG_NET_DSA_TAG_LAN9303) += tag_lan9303.o obj-$(CONFIG_NET_DSA_TAG_MTK) += tag_mtk.o obj-$(CONFIG_NET_DSA_TAG_QCA) += tag_qca.o obj-$(CONFIG_NET_DSA_TAG_SJA1105) += tag_sja1105.o obj-$(CONFIG_NET_DSA_TAG_TRAILER) += tag_trailer.o

由此可見核心代碼是：

obj-$(CONFIG_NET_DSA) += dsa_core.o dsa_core-y += dsa.o dsa2.o master.o port.o slave.o switch.o

./drivers/net/dsa/Makefile

# SPDX-License-Identifier: GPL-2.0 obj-$(CONFIG_NET_DSA_BCM_SF2) += bcm-sf2.o bcm-sf2-objs := bcm_sf2.o bcm_sf2_cfp.o obj-$(CONFIG_NET_DSA_LOOP) += dsa_loop.o ifdef CONFIG_NET_DSA_LOOP obj-$(CONFIG_FIXED_PHY) += dsa_loop_bdinfo.o endif obj-$(CONFIG_NET_DSA_LANTIQ_GSWIP) += lantiq_gswip.o obj-$(CONFIG_NET_DSA_MT7530) += mt7530.o obj-$(CONFIG_NET_DSA_MV88E6060) += mv88e6060.o obj-$(CONFIG_NET_DSA_QCA8K) += qca8k.o obj-$(CONFIG_NET_DSA_REALTEK_SMI) += realtek-smi.o realtek-smi-objs := realtek-smi-core.o rtl8366.o rtl8366rb.o obj-$(CONFIG_NET_DSA_SMSC_LAN9303) += lan9303-core.o obj-$(CONFIG_NET_DSA_SMSC_LAN9303_I2C) += lan9303_i2c.o obj-$(CONFIG_NET_DSA_SMSC_LAN9303_MDIO) += lan9303_mdio.o obj-$(CONFIG_NET_DSA_VITESSE_VSC73XX) += vitesse-vsc73xx-core.o obj-$(CONFIG_NET_DSA_VITESSE_VSC73XX_PLATFORM) += vitesse-vsc73xx-platform.o obj-$(CONFIG_NET_DSA_VITESSE_VSC73XX_SPI) += vitesse-vsc73xx-spi.o obj-y += b53/ obj-y += microchip/ obj-y += mv88e6xxx/ obj-y += sja1105/# 這里是不同廠家switch 驅(qū)動(dòng)

以 mt7530.c 為例，學(xué)習(xí) dsa switch 驅(qū)動(dòng)的寫法

static struct mdio_driver mt7530_mdio_driver = {.probe = mt7530_probe,.remove = mt7530_remove,.mdiodrv.driver = {.name = "mt7530",.of_match_table = mt7530_of_match,}, };mdio_module_driver(mt7530_mdio_driver);

要點(diǎn)：是用 mdio_module_driver

/*** mdio_module_driver() - Helper macro for registering mdio drivers** Helper macro for MDIO drivers which do not do anything special in module* init/exit. Each module may only use this macro once, and calling it* replaces module_init() and module_exit().*/ #define mdio_module_driver(_mdio_driver) \ static int __init mdio_module_init(void) \ { \return mdio_driver_register(&_mdio_driver); \ } \ module_init(mdio_module_init); \ static void __exit mdio_module_exit(void) \ { \mdio_driver_unregister(&_mdio_driver); \ } \ module_exit(mdio_module_exit)

mt7530_probe

static int mt7530_probe(struct mdio_device *mdiodev) {//...priv->bus = mdiodev->bus;priv->dev = &mdiodev->dev;priv->ds->priv = priv;priv->ds->ops = &mt7530_switch_ops; //關(guān)鍵代碼mutex_init(&priv->reg_mutex);dev_set_drvdata(&mdiodev->dev, priv);return dsa_register_switch(priv->ds); //關(guān)鍵代碼 }

關(guān)鍵在于 mt7530_switch_ops 和 dsa_register_switch

mt7530_switch_ops

static const struct dsa_switch_ops mt7530_switch_ops = {.get_tag_protocol = mtk_get_tag_protocol,.setup = mt7530_setup,.get_strings = mt7530_get_strings,.phy_read = mt7530_phy_read,.phy_write = mt7530_phy_write,.get_ethtool_stats = mt7530_get_ethtool_stats,.get_sset_count = mt7530_get_sset_count,.port_enable = mt7530_port_enable,.port_disable = mt7530_port_disable,.port_stp_state_set = mt7530_stp_state_set,.port_bridge_join = mt7530_port_bridge_join,.port_bridge_leave = mt7530_port_bridge_leave,.port_fdb_add = mt7530_port_fdb_add,.port_fdb_del = mt7530_port_fdb_del,.port_fdb_dump = mt7530_port_fdb_dump,.port_vlan_filtering = mt7530_port_vlan_filtering,.port_vlan_prepare = mt7530_port_vlan_prepare,.port_vlan_add = mt7530_port_vlan_add,.port_vlan_del = mt7530_port_vlan_del,.phylink_validate = mt7530_phylink_validate,.phylink_mac_link_state = mt7530_phylink_mac_link_state,.phylink_mac_config = mt7530_phylink_mac_config,.phylink_mac_link_down = mt7530_phylink_mac_link_down,.phylink_mac_link_up = mt7530_phylink_mac_link_up, };

定義了一些關(guān)鍵函數(shù)。

小結(jié) ：

• dsa switch 驅(qū)動(dòng)本身是 mdio 設(shè)備驅(qū)動(dòng)
• dsa switch 驅(qū)動(dòng)的核心是實(shí)現(xiàn) struct dsa_switch_ops 結(jié)構(gòu)體

dts 寫法

&eth {status = "okay";gmac0: mac@0 {compatible = "mediatek,eth-mac";reg = <0>;phy-mode = "trgmii";fixed-link {speed = <1000>;full-duplex;pause;};};mdio: mdio-bus {#address-cells = <1>;#size-cells = <0>;switch@0 {compatible = "mediatek,mt7530";reg = <0>;reset-gpios = <&pio 33 0>;core-supply = <&mt6323_vpa_reg>;io-supply = <&mt6323_vemc3v3_reg>;ports {#address-cells = <1>;#size-cells = <0>;port@0 {reg = <0>;label = "wan";};port@1 {reg = <1>;label = "lan0";};port@2 {reg = <2>;label = "lan1";};port@3 {reg = <3>;label = "lan2";};port@4 {reg = <4>;label = "lan3";};port@6 {reg = <6>;label = "cpu";ethernet = <&gmac0>;phy-mode = "trgmii";fixed-link {speed = <1000>;full-duplex;pause;};};};};}; };

詳見：Documentation/devicetree/bindings/net/dsa/dsa.txt

dsa switch 驅(qū)動(dòng)的骨架

static const struct dsa_switch_ops mt7530_switch_ops = { };static const struct of_device_id mt7530_of_match[] = {{ .compatible = "mediatek,mt7621", .data = (void *)ID_MT7621, },{ .compatible = "mediatek,mt7530", .data = (void *)ID_MT7530, },{ /* sentinel */ }, };MODULE_DEVICE_TABLE(of, mt7530_of_match); static int mt7530_probe(struct mdio_device *mdiodev) { }static void mt7530_remove(struct mdio_device *mdiodev) { }static struct mdio_driver mt7530_mdio_driver = {.probe = mt7530_probe,.remove = mt7530_remove,.mdiodrv.driver = {.name = "mt7530",.of_match_table = mt7530_of_match,}, };mdio_module_driver(mt7530_mdio_driver);MODULE_LICENSE("GPL");

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