Beispiel #1
0
static int dwc3_probe(struct platform_device *pdev)
{
	struct device		*dev = &pdev->dev;
	struct dwc3_platform_data *pdata = dev_get_platdata(dev);
	struct resource		*res;
	struct dwc3		*dwc;
	u8			lpm_nyet_threshold;
	u8			tx_de_emphasis;
	u8			hird_threshold;
	u32			fladj = 0;

	int			ret;

	void __iomem		*regs;
	void			*mem;

	mem = devm_kzalloc(dev, sizeof(*dwc) + DWC3_ALIGN_MASK, GFP_KERNEL);
	if (!mem)
		return -ENOMEM;

	dwc = PTR_ALIGN(mem, DWC3_ALIGN_MASK + 1);
	dwc->mem = mem;
	dwc->dev = dev;

	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	if (!res) {
		dev_err(dev, "missing IRQ\n");
		return -ENODEV;
	}
	dwc->xhci_resources[1].start = res->start;
	dwc->xhci_resources[1].end = res->end;
	dwc->xhci_resources[1].flags = res->flags;
	dwc->xhci_resources[1].name = res->name;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	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);
	if (IS_ERR(regs)) {
		ret = PTR_ERR(regs);
		goto err0;
	}

	dwc->regs	= regs;
	dwc->regs_size	= resource_size(res);

	/* default to highest possible threshold */
	lpm_nyet_threshold = 0xff;

	/* 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;

	dwc->maximum_speed = usb_get_maximum_speed(dev);
	dwc->dr_mode = usb_get_dr_mode(dev);

	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->needs_fifo_resize = device_property_read_bool(dev,
				"tx-fifo-resize");

	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->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",
				 &fladj);

	if (pdata) {
		dwc->maximum_speed = pdata->maximum_speed;
		dwc->has_lpm_erratum = pdata->has_lpm_erratum;
		if (pdata->lpm_nyet_threshold)
			lpm_nyet_threshold = pdata->lpm_nyet_threshold;
		dwc->is_utmi_l1_suspend = pdata->is_utmi_l1_suspend;
		if (pdata->hird_threshold)
			hird_threshold = pdata->hird_threshold;

		dwc->needs_fifo_resize = pdata->tx_fifo_resize;
		dwc->usb3_lpm_capable = pdata->usb3_lpm_capable;
		dwc->dr_mode = pdata->dr_mode;

		dwc->disable_scramble_quirk = pdata->disable_scramble_quirk;
		dwc->u2exit_lfps_quirk = pdata->u2exit_lfps_quirk;
		dwc->u2ss_inp3_quirk = pdata->u2ss_inp3_quirk;
		dwc->req_p1p2p3_quirk = pdata->req_p1p2p3_quirk;
		dwc->del_p1p2p3_quirk = pdata->del_p1p2p3_quirk;
		dwc->del_phy_power_chg_quirk = pdata->del_phy_power_chg_quirk;
		dwc->lfps_filter_quirk = pdata->lfps_filter_quirk;
		dwc->rx_detect_poll_quirk = pdata->rx_detect_poll_quirk;
		dwc->dis_u3_susphy_quirk = pdata->dis_u3_susphy_quirk;
		dwc->dis_u2_susphy_quirk = pdata->dis_u2_susphy_quirk;
		dwc->dis_enblslpm_quirk = pdata->dis_enblslpm_quirk;

		dwc->tx_de_emphasis_quirk = pdata->tx_de_emphasis_quirk;
		if (pdata->tx_de_emphasis)
			tx_de_emphasis = pdata->tx_de_emphasis;

		dwc->hsphy_interface = pdata->hsphy_interface;
		fladj = pdata->fladj_value;
	}

	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_phy_setup(dwc);
	if (ret)
		goto err0;

	ret = dwc3_core_get_phy(dwc);
	if (ret)
		goto err0;

	spin_lock_init(&dwc->lock);

	if (!dev->dma_mask) {
		dev->dma_mask = dev->parent->dma_mask;
		dev->dma_parms = dev->parent->dma_parms;
		dma_set_coherent_mask(dev, dev->parent->coherent_dma_mask);
	}

	pm_runtime_enable(dev);
	pm_runtime_get_sync(dev);
	pm_runtime_forbid(dev);

	ret = dwc3_alloc_event_buffers(dwc, DWC3_EVENT_BUFFERS_SIZE);
	if (ret) {
		dev_err(dwc->dev, "failed to allocate event buffers\n");
		ret = -ENOMEM;
		goto err1;
	}

	if (IS_ENABLED(CONFIG_USB_DWC3_HOST))
		dwc->dr_mode = USB_DR_MODE_HOST;
	else if (IS_ENABLED(CONFIG_USB_DWC3_GADGET))
		dwc->dr_mode = USB_DR_MODE_PERIPHERAL;

	if (dwc->dr_mode == USB_DR_MODE_UNKNOWN)
		dwc->dr_mode = USB_DR_MODE_OTG;

	ret = dwc3_core_init(dwc);
	if (ret) {
		dev_err(dev, "failed to initialize core\n");
		goto err1;
	}

	/* Check the maximum_speed parameter */
	switch (dwc->maximum_speed) {
	case USB_SPEED_LOW:
	case USB_SPEED_FULL:
	case USB_SPEED_HIGH:
	case USB_SPEED_SUPER:
	case USB_SPEED_SUPER_PLUS:
		break;
	default:
		dev_err(dev, "invalid maximum_speed parameter %d\n",
			dwc->maximum_speed);
		/* fall through */
	case USB_SPEED_UNKNOWN:
		/* default to superspeed */
		dwc->maximum_speed = USB_SPEED_SUPER;

		/*
		 * default to superspeed plus if we are capable.
		 */
		if (dwc3_is_usb31(dwc) &&
		    (DWC3_GHWPARAMS3_SSPHY_IFC(dwc->hwparams.hwparams3) ==
		     DWC3_GHWPARAMS3_SSPHY_IFC_GEN2))
			dwc->maximum_speed = USB_SPEED_SUPER_PLUS;

		break;
	}

	/* Adjust Frame Length */
	dwc3_frame_length_adjustment(dwc, fladj);

	usb_phy_set_suspend(dwc->usb2_phy, 0);
	usb_phy_set_suspend(dwc->usb3_phy, 0);
	ret = phy_power_on(dwc->usb2_generic_phy);
	if (ret < 0)
		goto err2;

	ret = phy_power_on(dwc->usb3_generic_phy);
	if (ret < 0)
		goto err3;

	ret = dwc3_event_buffers_setup(dwc);
	if (ret) {
		dev_err(dwc->dev, "failed to setup event buffers\n");
		goto err4;
	}

	ret = dwc3_core_init_mode(dwc);
	if (ret)
		goto err5;

	ret = dwc3_debugfs_init(dwc);
	if (ret) {
		dev_err(dev, "failed to initialize debugfs\n");
		goto err6;
	}

	pm_runtime_allow(dev);

	return 0;

err6:
	dwc3_core_exit_mode(dwc);

err5:
	dwc3_event_buffers_cleanup(dwc);

err4:
	phy_power_off(dwc->usb3_generic_phy);

err3:
	phy_power_off(dwc->usb2_generic_phy);

err2:
	usb_phy_set_suspend(dwc->usb2_phy, 1);
	usb_phy_set_suspend(dwc->usb3_phy, 1);
	dwc3_core_exit(dwc);

err1:
	dwc3_free_event_buffers(dwc);
	dwc3_ulpi_exit(dwc);

err0:
	/*
	 * restore res->start back to its original value so that, in case the
	 * probe is deferred, we don't end up getting error in request the
	 * memory region the next time probe is called.
	 */
	res->start -= DWC3_GLOBALS_REGS_START;

	return ret;
}
Beispiel #2
0
/**
 * dwc3_core_init - Low-level initialization of DWC3 Core
 * @dwc: Pointer to our controller context structure
 *
 * Returns 0 on success otherwise negative errno.
 */
static int dwc3_core_init(struct dwc3 *dwc)
{
	u32			reg;
	int			ret;

	if (!dwc3_core_is_valid(dwc)) {
		dev_err(dwc->dev, "this is not a DesignWare USB3 DRD Core\n");
		ret = -ENODEV;
		goto err0;
	}

	/*
	 * Write Linux Version Code to our GUID register so it's easy to figure
	 * out which kernel version a bug was found.
	 */
	dwc3_writel(dwc->regs, DWC3_GUID, LINUX_VERSION_CODE);

	/* Handle USB2.0-only core configuration */
	if (DWC3_GHWPARAMS3_SSPHY_IFC(dwc->hwparams.hwparams3) ==
			DWC3_GHWPARAMS3_SSPHY_IFC_DIS) {
		if (dwc->maximum_speed == USB_SPEED_SUPER)
			dwc->maximum_speed = USB_SPEED_HIGH;
	}

	ret = dwc3_core_soft_reset(dwc);
	if (ret)
		goto err0;

	ret = dwc3_phy_setup(dwc);
	if (ret)
		goto err0;

	dwc3_core_setup_global_control(dwc);
	dwc3_core_num_eps(dwc);

	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);
	if (ret < 0)
		goto err2;

	ret = phy_power_on(dwc->usb3_generic_phy);
	if (ret < 0)
		goto err3;

	ret = dwc3_event_buffers_setup(dwc);
	if (ret) {
		dev_err(dwc->dev, "failed to setup event buffers\n");
		goto err4;
	}

	/*
	 * ENDXFER polling is available on version 3.10a and later of
	 * the DWC_usb3 controller. It is NOT available in the
	 * DWC_usb31 controller.
	 */
	if (!dwc3_is_usb31(dwc) && dwc->revision >= DWC3_REVISION_310A) {
		reg = dwc3_readl(dwc->regs, DWC3_GUCTL2);
		reg |= DWC3_GUCTL2_RST_ACTBITLATER;
		dwc3_writel(dwc->regs, DWC3_GUCTL2, reg);
	}

	/*
	 * Enable hardware control of sending remote wakeup in HS when
	 * the device is in the L1 state.
	 */
	if (dwc->revision >= DWC3_REVISION_290A) {
		reg = dwc3_readl(dwc->regs, DWC3_GUCTL1);
		reg |= DWC3_GUCTL1_DEV_L1_EXIT_BY_HW;
		dwc3_writel(dwc->regs, DWC3_GUCTL1, reg);
	}

	return 0;

err4:
	phy_power_off(dwc->usb3_generic_phy);

err3:
	phy_power_off(dwc->usb2_generic_phy);

err2:
	usb_phy_set_suspend(dwc->usb2_phy, 1);
	usb_phy_set_suspend(dwc->usb3_phy, 1);

err1:
	usb_phy_shutdown(dwc->usb2_phy);
	usb_phy_shutdown(dwc->usb3_phy);
	phy_exit(dwc->usb2_generic_phy);
	phy_exit(dwc->usb3_generic_phy);

err0:
	return ret;
}
Beispiel #3
0
/**
 * dwc3_core_init - Low-level initialization of DWC3 Core
 * @dwc: Pointer to our controller context structure
 *
 * Returns 0 on success otherwise negative errno.
 */
int dwc3_core_init(struct dwc3 *dwc)
{
	u32			reg;
	int			ret;

	if (!dwc3_core_is_valid(dwc)) {
		dev_err(dwc->dev, "this is not a DesignWare USB3 DRD Core\n");
		ret = -ENODEV;
		goto err0;
	}

	/*
	 * Write Linux Version Code to our GUID register so it's easy to figure
	 * out which kernel version a bug was found.
	 */
	dwc3_writel(dwc->regs, DWC3_GUID, LINUX_VERSION_CODE);

	/* Handle USB2.0-only core configuration */
	if (DWC3_GHWPARAMS3_SSPHY_IFC(dwc->hwparams.hwparams3) ==
			DWC3_GHWPARAMS3_SSPHY_IFC_DIS) {
		if (dwc->maximum_speed == USB_SPEED_SUPER)
			dwc->maximum_speed = USB_SPEED_HIGH;
	}

	ret = dwc3_phy_setup(dwc);
	if (ret)
		goto err0;

	if (!dwc->ulpi_ready) {
		ret = dwc3_core_ulpi_init(dwc);
		if (ret)
			goto err0;
		dwc->ulpi_ready = true;
	}

	if (!dwc->phys_ready) {
		ret = dwc3_core_get_phy(dwc);
		if (ret)
			goto err0a;
		dwc->phys_ready = true;
	}

	ret = dwc3_core_soft_reset(dwc);
	if (ret)
		goto err0a;

	dwc3_core_setup_global_control(dwc);
	dwc3_core_num_eps(dwc);

	if (dwc->scratchbuf == NULL) {
		ret = dwc3_alloc_scratch_buffers(dwc);
		if (ret) {
			dev_err(dwc->dev,
				"Not enough memory for scratch buffers\n");
			goto err1;
		}
	}

	ret = dwc3_setup_scratch_buffers(dwc);
	if (ret) {
		dev_err(dwc->dev, "Failed to setup scratch buffers: %d\n", ret);
		goto err1;
	}

	/* Adjust Frame Length */
	dwc3_frame_length_adjustment(dwc);

	dwc3_set_incr_burst_type(dwc);

	ret = dwc3_config_soc_bus(dwc);
	if (ret)
		goto err1;

	usb_phy_set_suspend(dwc->usb2_phy, 0);
	usb_phy_set_suspend(dwc->usb3_phy, 0);
	ret = phy_power_on(dwc->usb2_generic_phy);
	if (ret < 0)
		goto err2;

	ret = phy_power_on(dwc->usb3_generic_phy);
	if (ret < 0)
		goto err3;

	ret = dwc3_event_buffers_setup(dwc);
	if (ret) {
		dev_err(dwc->dev, "failed to setup event buffers\n");
		goto err4;
	}

	switch (dwc->dr_mode) {
	case USB_DR_MODE_PERIPHERAL:
		dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_DEVICE);
		break;
	case USB_DR_MODE_HOST:
		dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_HOST);
		break;
	case USB_DR_MODE_OTG:
		dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_OTG);
		break;
	default:
		dev_warn(dwc->dev, "Unsupported mode %d\n", dwc->dr_mode);
		break;
	}

	/*
	 * ENDXFER polling is available on version 3.10a and later of
	 * the DWC_usb3 controller. It is NOT available in the
	 * DWC_usb31 controller.
	 */
	if (!dwc3_is_usb31(dwc) && dwc->revision >= DWC3_REVISION_310A) {
		reg = dwc3_readl(dwc->regs, DWC3_GUCTL2);
		reg |= DWC3_GUCTL2_RST_ACTBITLATER;
		dwc3_writel(dwc->regs, DWC3_GUCTL2, reg);
	}

	/* When configured in HOST mode, after issuing U3/L2 exit controller
	 * fails to send proper CRC checksum in CRC5 feild. Because of this
	 * behaviour Transaction Error is generated, resulting in reset and
	 * re-enumeration of usb device attached. Enabling bit 10 of GUCTL1
	 * will correct this problem
	 */
	if (dwc->enable_guctl1_resume_quirk) {
		reg = dwc3_readl(dwc->regs, DWC3_GUCTL1);
		reg |= DWC3_GUCTL1_RESUME_QUIRK;
		dwc3_writel(dwc->regs, DWC3_GUCTL1, reg);
	}

	/* SNPS controller when configureed in HOST mode maintains Inter Packet
	 * Delay (IPD) of ~380ns which works with most of the super-speed hubs
	 * except VIA-LAB hubs. When IPD is ~380ns HOST controller fails to
	 * enumerate FS/LS devices when connected behind VIA-LAB hubs.
	 * Enabling bit 9 of GUCTL1 enables the workaround in HW to reduce the
	 * ULPI clock latency by 1 cycle, thus reducing the IPD (~360ns) and
	 * making controller enumerate FS/LS devices connected behind VIA-LAB.
	 */
	if (dwc->enable_guctl1_ipd_quirk) {
		reg = dwc3_readl(dwc->regs, DWC3_GUCTL1);
		reg |= DWC3_GUCTL1_IPD_QUIRK;
		dwc3_writel(dwc->regs, DWC3_GUCTL1, reg);
	}

	if (dwc->revision >= DWC3_REVISION_250A) {
		reg = dwc3_readl(dwc->regs, DWC3_GUCTL1);

		/*
		 * Enable hardware control of sending remote wakeup
		 * in HS when the device is in the L1 state.
		 */
		if (dwc->revision >= DWC3_REVISION_290A)
			reg |= DWC3_GUCTL1_DEV_L1_EXIT_BY_HW;

		if (dwc->dis_tx_ipgap_linecheck_quirk)
			reg |= DWC3_GUCTL1_TX_IPGAP_LINECHECK_DIS;

		dwc3_writel(dwc->regs, DWC3_GUCTL1, reg);
	}

	if (dwc->dr_mode == USB_DR_MODE_HOST ||
	    dwc->dr_mode == USB_DR_MODE_OTG) {
		reg = dwc3_readl(dwc->regs, DWC3_GUCTL);

		/*
		 * Enable Auto retry Feature to make the controller operating in
		 * Host mode on seeing transaction errors(CRC errors or internal
		 * overrun scenerios) on IN transfers to reply to the device
		 * with a non-terminating retry ACK (i.e, an ACK transcation
		 * packet with Retry=1 & Nump != 0)
		 */
		reg |= DWC3_GUCTL_HSTINAUTORETRY;

		dwc3_writel(dwc->regs, DWC3_GUCTL, reg);
	}

	/*
	 * Must config both number of packets and max burst settings to enable
	 * RX and/or TX threshold.
	 */
	if (dwc3_is_usb31(dwc) && dwc->dr_mode == USB_DR_MODE_HOST) {
		u8 rx_thr_num = dwc->rx_thr_num_pkt_prd;
		u8 rx_maxburst = dwc->rx_max_burst_prd;
		u8 tx_thr_num = dwc->tx_thr_num_pkt_prd;
		u8 tx_maxburst = dwc->tx_max_burst_prd;

		if (rx_thr_num && rx_maxburst) {
			reg = dwc3_readl(dwc->regs, DWC3_GRXTHRCFG);
			reg |= DWC31_RXTHRNUMPKTSEL_PRD;

			reg &= ~DWC31_RXTHRNUMPKT_PRD(~0);
			reg |= DWC31_RXTHRNUMPKT_PRD(rx_thr_num);

			reg &= ~DWC31_MAXRXBURSTSIZE_PRD(~0);
			reg |= DWC31_MAXRXBURSTSIZE_PRD(rx_maxburst);

			dwc3_writel(dwc->regs, DWC3_GRXTHRCFG, reg);
		}

		if (tx_thr_num && tx_maxburst) {
			reg = dwc3_readl(dwc->regs, DWC3_GTXTHRCFG);
			reg |= DWC31_TXTHRNUMPKTSEL_PRD;

			reg &= ~DWC31_TXTHRNUMPKT_PRD(~0);
			reg |= DWC31_TXTHRNUMPKT_PRD(tx_thr_num);

			reg &= ~DWC31_MAXTXBURSTSIZE_PRD(~0);
			reg |= DWC31_MAXTXBURSTSIZE_PRD(tx_maxburst);

			dwc3_writel(dwc->regs, DWC3_GTXTHRCFG, reg);
		}
	}

	return 0;

err4:
	phy_power_off(dwc->usb3_generic_phy);

err3:
	phy_power_off(dwc->usb2_generic_phy);

err2:
	usb_phy_set_suspend(dwc->usb2_phy, 1);
	usb_phy_set_suspend(dwc->usb3_phy, 1);

err1:
	usb_phy_shutdown(dwc->usb2_phy);
	usb_phy_shutdown(dwc->usb3_phy);
	phy_exit(dwc->usb2_generic_phy);
	phy_exit(dwc->usb3_generic_phy);

err0a:
	dwc3_ulpi_exit(dwc);

err0:
	return ret;
}