1 // SPDX-License-Identifier: GPL-2.0
13 #include <linux/usb.h>
14 #include <linux/usb/chipidea.h>
15 #include <linux/usb/hcd.h>
16 #include <linux/usb/of.h>
17 #include <linux/usb/phy.h>
30 	struct usb_phy *phy;  member
76 		.compatible = "nvidia,tegra20-ehci",
79 		.compatible = "nvidia,tegra30-ehci",
82 		.compatible = "nvidia,tegra20-udc",
85 		.compatible = "nvidia,tegra30-udc",
88 		.compatible = "nvidia,tegra114-udc",
91 		.compatible = "nvidia,tegra124-udc",
105 	rst = devm_reset_control_get_shared(dev, "usb");  in tegra_usb_reset_controller()
111 	phy_np = of_parse_phandle(dev->of_node, "nvidia,phy", 0);  in tegra_usb_reset_controller()
113 		return -ENOENT;  in tegra_usb_reset_controller()
116 	 * The 1st USB controller contains some UTMI pad registers that are  in tegra_usb_reset_controller()
118 	 * also cleared when reset is asserted to the 1st controller.  in tegra_usb_reset_controller()
120 	rst_utmi = of_reset_control_get_shared(phy_np, "utmi-pads");  in tegra_usb_reset_controller()
122 		dev_warn(dev, "can't get utmi-pads reset from the PHY\n");  in tegra_usb_reset_controller()
126 		 * PHY driver performs UTMI-pads reset in a case of a  in tegra_usb_reset_controller()
127 		 * non-legacy DT.  in tegra_usb_reset_controller()
154 	struct tegra_usb *usb = dev_get_drvdata(ci->dev->parent);  in tegra_usb_notify_event()  local
159 		if (ci->hcd) {  in tegra_usb_notify_event()
160 			ehci = hcd_to_ehci(ci->hcd);  in tegra_usb_notify_event()
161 			ehci->has_tdi_phy_lpm = false;  in tegra_usb_notify_event()
162 			ehci_writel(ehci, usb->soc->txfifothresh << 16,  in tegra_usb_notify_event()
163 				    &ehci->regs->txfill_tuning);  in tegra_usb_notify_event()
179 	saved_usbintr = ehci_readl(ehci, &ehci->regs->intr_enable);  in tegra_usb_internal_port_reset()
180 	/* disable USB interrupt */  in tegra_usb_internal_port_reset()
181 	ehci_writel(ehci, 0, &ehci->regs->intr_enable);  in tegra_usb_internal_port_reset()
182 	spin_unlock_irqrestore(&ehci->lock, *flags);  in tegra_usb_internal_port_reset()
206 		} while (!(temp & PORT_PE) && tries--);  in tegra_usb_internal_port_reset()
211 		retval = -ETIMEDOUT;  in tegra_usb_internal_port_reset()
224 	temp = ehci_readl(ehci, &ehci->regs->status);  in tegra_usb_internal_port_reset()
225 	ehci_writel(ehci, temp, &ehci->regs->status);  in tegra_usb_internal_port_reset()
227 	/* restore original interrupt-enable bits */  in tegra_usb_internal_port_reset()
228 	spin_lock_irqsave(&ehci->lock, *flags);  in tegra_usb_internal_port_reset()
229 	ehci_writel(ehci, saved_usbintr, &ehci->regs->intr_enable);  in tegra_usb_internal_port_reset()
238 	struct tegra_usb *usb = dev_get_drvdata(ci->dev->parent);  in tegra_ehci_hub_control()  local
239 	struct ehci_hcd *ehci = hcd_to_ehci(ci->hcd);  in tegra_ehci_hub_control()
243 	status_reg = &ehci->regs->port_status[(wIndex & 0xff) - 1];  in tegra_ehci_hub_control()
247 		if (wValue != USB_PORT_FEAT_RESET || !usb->needs_double_reset)  in tegra_ehci_hub_control()
263 	 * hang CPU if USB controller is put into low power mode because  in tegra_usb_enter_lpm()
264 	 * AHB USB clock is gated on Tegra in the LPM.  in tegra_usb_enter_lpm()
266 	 * Tegra PHY has a separate register for checking the clock status  in tegra_usb_enter_lpm()
268 	 * and restoring the PHY state on Tegra. Hence DEVLC/PORTSC registers  in tegra_usb_enter_lpm()
271 	usb_phy_set_suspend(ci->usb_phy, enable);  in tegra_usb_enter_lpm()
277 	struct tegra_usb *usb;  in tegra_usb_probe()  local
280 	usb = devm_kzalloc(&pdev->dev, sizeof(*usb), GFP_KERNEL);  in tegra_usb_probe()
281 	if (!usb)  in tegra_usb_probe()
282 		return -ENOMEM;  in tegra_usb_probe()
284 	platform_set_drvdata(pdev, usb);  in tegra_usb_probe()
286 	soc = of_device_get_match_data(&pdev->dev);  in tegra_usb_probe()
288 		dev_err(&pdev->dev, "failed to match OF data\n");  in tegra_usb_probe()
289 		return -EINVAL;  in tegra_usb_probe()
292 	usb->phy = devm_usb_get_phy_by_phandle(&pdev->dev, "nvidia,phy", 0);  in tegra_usb_probe()
293 	if (IS_ERR(usb->phy))  in tegra_usb_probe()
294 		return dev_err_probe(&pdev->dev, PTR_ERR(usb->phy),  in tegra_usb_probe()
295 				     "failed to get PHY\n");  in tegra_usb_probe()
297 	usb->clk = devm_clk_get(&pdev->dev, NULL);  in tegra_usb_probe()
298 	if (IS_ERR(usb->clk)) {  in tegra_usb_probe()
299 		err = PTR_ERR(usb->clk);  in tegra_usb_probe()
300 		dev_err(&pdev->dev, "failed to get clock: %d\n", err);  in tegra_usb_probe()
304 	err = devm_tegra_core_dev_init_opp_table_common(&pdev->dev);  in tegra_usb_probe()
308 	pm_runtime_enable(&pdev->dev);  in tegra_usb_probe()
309 	err = pm_runtime_resume_and_get(&pdev->dev);  in tegra_usb_probe()
313 	if (device_property_present(&pdev->dev, "nvidia,needs-double-reset"))  in tegra_usb_probe()
314 		usb->needs_double_reset = true;  in tegra_usb_probe()
316 	err = tegra_usb_reset_controller(&pdev->dev);  in tegra_usb_probe()
318 		dev_err(&pdev->dev, "failed to reset controller: %d\n", err);  in tegra_usb_probe()
323 	 * USB controller registers shouldn't be touched before PHY is  in tegra_usb_probe()
325 	 * PHY driver controls gating of internal USB clocks on Tegra.  in tegra_usb_probe()
327 	err = usb_phy_init(usb->phy);  in tegra_usb_probe()
332 	usb->soc = soc;  in tegra_usb_probe()
333 	usb->data.name = "tegra-usb";  in tegra_usb_probe()
334 	usb->data.flags = soc->flags;  in tegra_usb_probe()
335 	usb->data.usb_phy = usb->phy;  in tegra_usb_probe()
336 	usb->data.dr_mode = soc->dr_mode;  in tegra_usb_probe()
337 	usb->data.capoffset = DEF_CAPOFFSET;  in tegra_usb_probe()
338 	usb->data.enter_lpm = tegra_usb_enter_lpm;  in tegra_usb_probe()
339 	usb->data.hub_control = tegra_ehci_hub_control;  in tegra_usb_probe()
340 	usb->data.notify_event = tegra_usb_notify_event;  in tegra_usb_probe()
342 	/* Tegra PHY driver currently doesn't support LPM for ULPI */  in tegra_usb_probe()
343 	if (of_usb_get_phy_mode(pdev->dev.of_node) == USBPHY_INTERFACE_MODE_ULPI)  in tegra_usb_probe()
344 		usb->data.flags &= ~CI_HDRC_SUPPORTS_RUNTIME_PM;  in tegra_usb_probe()
346 	usb->dev = ci_hdrc_add_device(&pdev->dev, pdev->resource,  in tegra_usb_probe()
347 				      pdev->num_resources, &usb->data);  in tegra_usb_probe()
348 	if (IS_ERR(usb->dev)) {  in tegra_usb_probe()
349 		err = PTR_ERR(usb->dev);  in tegra_usb_probe()
350 		dev_err(&pdev->dev, "failed to add HDRC device: %d\n", err);  in tegra_usb_probe()
357 	usb_phy_shutdown(usb->phy);  in tegra_usb_probe()
359 	pm_runtime_put_sync_suspend(&pdev->dev);  in tegra_usb_probe()
360 	pm_runtime_force_suspend(&pdev->dev);  in tegra_usb_probe()
367 	struct tegra_usb *usb = platform_get_drvdata(pdev);  in tegra_usb_remove()  local
369 	ci_hdrc_remove_device(usb->dev);  in tegra_usb_remove()
370 	usb_phy_shutdown(usb->phy);  in tegra_usb_remove()
372 	pm_runtime_put_sync_suspend(&pdev->dev);  in tegra_usb_remove()
373 	pm_runtime_force_suspend(&pdev->dev);  in tegra_usb_remove()
380 	struct tegra_usb *usb = dev_get_drvdata(dev);  in tegra_usb_runtime_resume()  local
383 	err = clk_prepare_enable(usb->clk);  in tegra_usb_runtime_resume()
394 	struct tegra_usb *usb = dev_get_drvdata(dev);  in tegra_usb_runtime_suspend()  local
396 	clk_disable_unprepare(usb->clk);  in tegra_usb_runtime_suspend()
408 		.name = "tegra-usb",
417 MODULE_DESCRIPTION("NVIDIA Tegra USB driver");