linux dwc3 usb驱动分析

基于linux 4.9内核

源码：

drivers/usb/dw3/core.c

主要完成DesignWare USB3.0 Controller phy初始化，以及模式选择。

static struct platform_driver dwc3_driver = {.probe        = dwc3_probe,.remove        = dwc3_remove,.driver        = {.name    = "dwc3",.of_match_table    = of_match_ptr(of_dwc3_match),.acpi_match_table = ACPI_PTR(dwc3_acpi_match),.pm    = &dwc3_dev_pm_ops,},
};static int dwc3_probe(struct platform_device *pdev)
{struct device      *dev = &pdev->dev;struct resource       *res;struct dwc3        *dwc;
。。。res = platform_get_resource(pdev, IORESOURCE_MEM, 0); //获取资源if (!res) {dev_err(dev, "missing memory resource\n");return -ENODEV;}dwc->xhci_resources[0].start = res->start;dwc->xhci_resources[0].end = dwc->xhci_resources[0].start +DWC3_XHCI_REGS_END;dwc->xhci_resources[0].flags = res->flags;dwc->xhci_resources[0].name = res->name;res->start += DWC3_GLOBALS_REGS_START;/** Request memory region but exclude xHCI regs,* since it will be requested by the xhci-plat driver.*/regs = devm_ioremap_resource(dev, res); //获取内存空间dwc->regs   = regs;dwc->regs_size   = resource_size(res);/* default to highest possible threshold */lpm_nyet_threshold = 0xf;/* default to -3.5dB de-emphasis */tx_de_emphasis = 1;/** default to assert utmi_sleep_n and use maximum allowed HIRD* threshold value of 0b1100*/hird_threshold = 12;
//获取默认值，有些是从dts中读取的dwc->maximum_speed = usb_get_maximum_speed(dev);dwc->dr_mode = usb_get_dr_mode(dev);dwc->hsphy_mode = of_usb_get_phy_mode(dev->of_node);dwc->has_lpm_erratum = device_property_read_bool(dev,"snps,has-lpm-erratum");device_property_read_u8(dev, "snps,lpm-nyet-threshold",&lpm_nyet_threshold);dwc->is_utmi_l1_suspend = device_property_read_bool(dev,"snps,is-utmi-l1-suspend");device_property_read_u8(dev, "snps,hird-threshold",&hird_threshold);dwc->usb3_lpm_capable = device_property_read_bool(dev,"snps,usb3_lpm_capable");dwc->disable_scramble_quirk = device_property_read_bool(dev,"snps,disable_scramble_quirk");dwc->u2exit_lfps_quirk = device_property_read_bool(dev,"snps,u2exit_lfps_quirk");dwc->u2ss_inp3_quirk = device_property_read_bool(dev,"snps,u2ss_inp3_quirk");dwc->req_p1p2p3_quirk = device_property_read_bool(dev,"snps,req_p1p2p3_quirk");dwc->del_p1p2p3_quirk = device_property_read_bool(dev,"snps,del_p1p2p3_quirk");dwc->del_phy_power_chg_quirk = device_property_read_bool(dev,"snps,del_phy_power_chg_quirk");dwc->lfps_filter_quirk = device_property_read_bool(dev,"snps,lfps_filter_quirk");dwc->rx_detect_poll_quirk = device_property_read_bool(dev,"snps,rx_detect_poll_quirk");dwc->dis_u3_susphy_quirk = device_property_read_bool(dev,"snps,dis_u3_susphy_quirk");dwc->dis_u2_susphy_quirk = device_property_read_bool(dev,"snps,dis_u2_susphy_quirk");dwc->dis_enblslpm_quirk = device_property_read_bool(dev,"snps,dis_enblslpm_quirk");dwc->dis_rxdet_inp3_quirk = device_property_read_bool(dev,"snps,dis_rxdet_inp3_quirk");dwc->dis_u2_freeclk_exists_quirk = device_property_read_bool(dev,"snps,dis-u2-freeclk-exists-quirk");dwc->dis_del_phy_power_chg_quirk = device_property_read_bool(dev,"snps,dis-del-phy-power-chg-quirk");dwc->tx_de_emphasis_quirk = device_property_read_bool(dev,"snps,tx_de_emphasis_quirk");device_property_read_u8(dev, "snps,tx_de_emphasis",&tx_de_emphasis);device_property_read_string(dev, "snps,hsphy_interface",&dwc->hsphy_interface);device_property_read_u32(dev, "snps,quirk-frame-length-adjustment",&dwc->fladj);dwc->lpm_nyet_threshold = lpm_nyet_threshold;dwc->tx_de_emphasis = tx_de_emphasis;dwc->hird_threshold = hird_threshold| (dwc->is_utmi_l1_suspend << 4);platform_set_drvdata(pdev, dwc);dwc3_cache_hwparams(dwc);ret = dwc3_core_get_phy(dwc);pm_runtime_set_active(dev);pm_runtime_use_autosuspend(dev);pm_runtime_set_autosuspend_delay(dev, DWC3_DEFAULT_AUTOSUSPEND_DELAY);pm_runtime_enable(dev);ret = pm_runtime_get_sync(dev);pm_runtime_forbid(dev);ret = dwc3_alloc_event_buffers(dwc, DWC3_EVENT_BUFFERS_SIZE); //分配event buf空间
//获取usb mode(dr_mode),otg、host或者deviceret = dwc3_get_dr_mode(dwc);ret = dwc3_alloc_scratch_buffers(dwc); //分配暂存缓冲区ret = dwc3_core_init(dwc); //初始化PHY，获取模式。。。ret = dwc3_core_init_mode(dwc); //根据mode，分别初始化gadget,host和otgdwc3_debugfs_init(dwc);pm_runtime_put(dev);。。。。。。return ret;
}

我们看看dwc3_core_init@core.c做了什么？

static int dwc3_core_init(struct dwc3 *dwc)
{u32            hwparams4 = dwc->hwparams.hwparams4;u32         reg;int         ret;。。。。。。/* issue device SoftReset too *///软复位ret = dwc3_soft_reset(dwc);//初始化phy后如果是device设备再次软复位，host设置直接返回ret = dwc3_core_soft_reset(dwc);ret = dwc3_phy_setup(dwc); //PHY接口初始化。。。dwc3_core_num_eps(dwc); //获取in,out端点数ret = dwc3_setup_scratch_buffers(dwc);if (ret)goto err1;/* Adjust Frame Length */dwc3_frame_length_adjustment(dwc);usb_phy_set_suspend(dwc->usb2_phy, 0);usb_phy_set_suspend(dwc->usb3_phy, 0);ret = phy_power_on(dwc->usb2_generic_phy);ret = phy_power_on(dwc->usb3_generic_phy); //phy 上电ret = dwc3_event_buffers_setup(dwc);if (ret) {dev_err(dwc->dev, "failed to setup event buffers\n");goto err4;}switch (dwc->dr_mode) { //设置dr模式case USB_DR_MODE_PERIPHERAL:dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_DEVICE);break;case USB_DR_MODE_HOST:dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_HOST);break;case USB_DR_MODE_OTG:dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_OTG);break;default:dev_warn(dwc->dev, "Unsupported mode %d\n", dwc->dr_mode);break;}。。。return ret;
}

dwc3_core_init_mode分别根据不同的模式，调用不同的初始化函数：

static int dwc3_core_init_mode(struct dwc3 *dwc)
{struct device *dev = dwc->dev;int ret;switch (dwc->dr_mode) {case USB_DR_MODE_PERIPHERAL: //gadget模式ret = dwc3_gadget_init(dwc);break;case USB_DR_MODE_HOST: //主机模式ret = dwc3_host_init(dwc);break;case USB_DR_MODE_OTG: //otg模式ret = dwc3_host_init(dwc);ret = dwc3_gadget_init(dwc);break;}return 0;
}

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