[RK3288][Android6.0] USB ECHI 驱动小结

2019-11-09 18:13:20

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Platform: RK3288OS: Android 6.0Kernel: 3.10.92usbdev_rk32.c:rk3288平台的usb host controller接口实现都在这里.echi-hcd.c:linux通用echi hcd驱动.echi-rockchip.c:平台echi驱动.rk3288平台总共有5个usb host controller(hcd), 每个usb口都分别使用不同的hcd, 对应的配置在文件rk3288.dtsi中usb0: usb@ff580000 { compatible = "rockchip,rk3288_usb20_otg"; reg = <0xff580000 0x40000>; interrupts = <GIC_SPI 23 IRQ_TYPE_LEVEL_HIGH>; clocks = <&clk_gates13 4>, <&clk_gates7 4>; clock-names = "clk_usbphy0", "hclk_usb0"; resets = <&reset RK3288_SOFT_RST_USBOTG_H>, <&reset RK3288_SOFT_RST_USBOTGPHY>, <&reset RK3288_SOFT_RST_USBOTGC>; reset-names = "otg_ahb", "otg_phy", "otg_controller"; /*0 - Normal, 1 - Force Host, 2 - Force Device*/ rockchip,usb-mode = <0>; }; usb1: usb@ff540000 { compatible = "rockchip,rk3288_usb20_host"; reg = <0xff540000 0x40000>; interrupts = <GIC_SPI 25 IRQ_TYPE_LEVEL_HIGH>; clocks = <&clk_gates13 6>, <&clk_gates7 7>, <&usbphy_480m>; clock-names = "clk_usbphy1", "hclk_usb1", "usbphy_480m"; resets = <&reset RK3288_SOFT_RST_USBHOST1_H>, <&reset RK3288_SOFT_RST_USBHOST1PHY>, <&reset RK3288_SOFT_RST_USBHOST1C>; reset-names = "host1_ahb", "host1_phy", "host1_controller"; }; usb2: usb@ff500000 { compatible = "rockchip,rk3288_rk_ehci_host"; reg = <0xff500000 0x20000>; interrupts = <GIC_SPI 24 IRQ_TYPE_LEVEL_HIGH>; clocks = <&clk_gates13 5>, <&clk_gates7 6>; clock-names = "clk_usbphy2", "hclk_usb2"; resets = <&reset RK3288_SOFT_RST_USBHOST0_H>, <&reset RK3288_SOFT_RST_USBHOST0PHY>, <&reset RK3288_SOFT_RST_USBHOST0C>, <&reset RK3288_SOFT_RST_USB_HOST0>; reset-names = "ehci_ahb", "ehci_phy", "ehci_controller", "ehci"; }; usb3: usb@ff520000 { compatible = "rockchip,rk3288_rk_ohci_host"; reg = <0xff520000 0x20000>; interrupts = <GIC_SPI 41 IRQ_TYPE_LEVEL_HIGH>; clocks = <&clk_gates13 5>, <&clk_gates7 6>; clock-names = "clk_usbphy3", "hclk_usb3"; status = "okay"; }; usb4: usb@ff5c0000 { compatible = "rockchip,rk3288_rk_ehci1_host"; reg = <0xff5c0000 0x40000>; interrupts = <GIC_SPI 26 IRQ_TYPE_LEVEL_HIGH>; clocks = <&ehci1phy_480m>, <&clk_gates7 8>, <&ehci1phy_12m>, <&usbphy_480m>, <&otgphy1_480m>, <&otgphy2_480m>; clock-names = "ehci1phy_480m", "hclk_ehci1", "ehci1phy_12m", "usbphy_480m", "ehci1_usbphy1", "ehci1_usbphy2"; resets = <&reset RK3288_SOFT_RST_EHCI1>, <&reset RK3288_SOFT_RST_EHCI1_AUX>, <&reset RK3288_SOFT_RST_EHCI1PHY>; reset-names = "ehci1_ahb", "ehci1_aux", "ehci1_phy"; };各个控制器的驱动大同小异, 这里以echi驱动为例, 看完下面流程会发现各usb controller需要实现的是struct rkehci_platform_data.ehci_rk_init -> echi-rockchip.c ehci_init_driver ehci-hcd.c //使用标准ehci驱动配置 platform_driver_register -> //driver name是rockchip,rk3288_rk_ehci_host, data是struct rkehci_platform_data rkehci_pdata_rk3288 ehci_rk_PRobe -> usb_create_hcd //标准创建hcd方法 pldata->hw_init -> //调用的是rkehci_pdata_rk3288里的函数 rk_ehci_hw_init usbdev_rk32.c pldata->clock_init -> rk_ehci_clock_init pldata->clock_enable -> rk_ehci_clock_enable pldata->phy_suspend -> rk_ehci_phy_suspend pldata->soft_reset -> rk_ehci_soft_reset usb_add_hcd //标准添加hcd方法 rk_ehci->connect_detect_timer.function = rk_ehci_hcd_connect_detect //timer实现函数,2秒调用一次 INIT_DELAYED_WORK(&rk_ehci->host_enable_work, rk_ehci_hcd_enable); //work函数会在定时器函数中被调用. 定时器回调函数:rk_ehci_hcd_connect_detect -> pldata->get_status -> rk_ehci_get_status schedule_delayed_work -> //如果usb处于enable状态就调用work queue rk_ehci_hcd_enable -> pldata->phy_suspend -> rk_ehci_phy_suspend //通过此接口来开关硬件host controller mod_timer(&rk_ehci->connect_detect_timer, jiffies + (HZ << 1)); //定时器的下一次工作需要自己设置.

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