1 // SPDX-License-Identifier: GPL-2.0
7  *  - dwc3-qcom.c Copyright (c) 2018, The Linux Foundation. All rights reserved.
8  *  - dwc3-of-simple.c Copyright (c) 2015 Texas Instruments Incorporated - https://www.ti.com
22  * 1) The PHY itself has to be brought up; for this we need to know the mode (USB3,
25  * 3) The PHY bring-up has to be finalized and dwc3's PIPE interface has to be switched to the
27  * 4) We can now initialize xhci or gadget mode.
29  * We can switch 1 and 2 but 3 has to happen after (1 and 2) and 4 has to happen after 3.
33  * 1) DWC3 has to exit host or gadget mode and must no longer touch those registers
34  * 2) The PHY has to switch dwc3's PIPE interface back to the dummy backend
37  * We also can't transition the PHY from one mode to another while dwc3 is up and running (this is
44  * mode we don't even get a USBDisconnected event and everything looks like there's still something
46  * This can be partially explained because the USB2 D+/D- lines are connected through a stateful
48  * resets the repeater out-of-band everytime the CC lines are (dis)connected. This then requires a
58  * because then we can't shut down the PHY anymore. And if we kept the PHY running in whatever mode
68  * Once a cable is connected we then keep track of the controller mode here by transitioning to
74 	DWC3_APPLE_HOST, /* Cable connected, dwc3 in host mode */
75 	DWC3_APPLE_DEVICE, /* Cable connected, dwc3 in device mode */
79  * struct dwc3_apple - Apple-specific DWC3 USB controller
83  * @apple_regs: Apple-specific DWC3 registers
85  * @role_sw: USB role switch
107  * Apple Silicon dwc3 vendor-specific registers
132 	writel(value, appledwc->apple_regs + offset - APPLE_DWC3_REGS_START);  in dwc3_apple_writel()
137 	return readl(appledwc->apple_regs + offset - APPLE_DWC3_REGS_START);  in dwc3_apple_readl()
165 static void dwc3_apple_set_ptrcap(struct dwc3_apple *appledwc, u32 mode)  in dwc3_apple_set_ptrcap()  argument
167 	guard(spinlock_irqsave)(&appledwc->dwc.lock);  in dwc3_apple_set_ptrcap()
168 	dwc3_set_prtcap(&appledwc->dwc, mode, false);  in dwc3_apple_set_ptrcap()
176 	lockdep_assert_held(&appledwc->lock);  in dwc3_apple_core_probe()
177 	WARN_ON_ONCE(appledwc->state != DWC3_APPLE_PROBE_PENDING);  in dwc3_apple_core_probe()
179 	appledwc->dwc.dev = appledwc->dev;  in dwc3_apple_core_probe()
180 	probe_data.dwc = &appledwc->dwc;  in dwc3_apple_core_probe()
181 	probe_data.res = appledwc->mmio_resource;  in dwc3_apple_core_probe()
190 	appledwc->state = DWC3_APPLE_NO_CABLE;  in dwc3_apple_core_probe()
198 	lockdep_assert_held(&appledwc->lock);  in dwc3_apple_core_init()
200 	switch (appledwc->state) {  in dwc3_apple_core_init()
204 			dev_err(appledwc->dev, "Failed to probe DWC3 Core, err=%d\n", ret);  in dwc3_apple_core_init()
207 		ret = dwc3_core_init(&appledwc->dwc);  in dwc3_apple_core_init()
209 			dev_err(appledwc->dev, "Failed to initialize DWC3 Core, err=%d\n", ret);  in dwc3_apple_core_init()
211 	default:  in dwc3_apple_core_init()
214 		ret = -EINVAL;  in dwc3_apple_core_init()
221 static void dwc3_apple_phy_set_mode(struct dwc3_apple *appledwc, enum phy_mode mode)  in dwc3_apple_phy_set_mode()  argument
223 	lockdep_assert_held(&appledwc->lock);  in dwc3_apple_phy_set_mode()
227 	 * the PHY and switch dwc3's PIPE interface to USB3 PHY.  in dwc3_apple_phy_set_mode()
229 	dwc3_enable_susphy(&appledwc->dwc, true);  in dwc3_apple_phy_set_mode()
230 	phy_set_mode(appledwc->dwc.usb2_generic_phy[0], mode);  in dwc3_apple_phy_set_mode()
231 	phy_set_mode(appledwc->dwc.usb3_generic_phy[0], mode);  in dwc3_apple_phy_set_mode()
238 	lockdep_assert_held(&appledwc->lock);  in dwc3_apple_init()
240 	ret = reset_control_deassert(appledwc->reset);  in dwc3_apple_init()
242 		dev_err(appledwc->dev, "Failed to deassert reset, err=%d\n", ret);  in dwc3_apple_init()
252 	 * configure some unknown Apple-specific settings and then bring up xhci or gadget mode.  in dwc3_apple_init()
256 	switch (state) {  in dwc3_apple_init()
258 		appledwc->dwc.dr_mode = USB_DR_MODE_HOST;  in dwc3_apple_init()
261 		ret = dwc3_host_init(&appledwc->dwc);  in dwc3_apple_init()
263 			dev_err(appledwc->dev, "Failed to initialize host, ret=%d\n", ret);  in dwc3_apple_init()
269 		appledwc->dwc.dr_mode = USB_DR_MODE_PERIPHERAL;  in dwc3_apple_init()
272 		ret = dwc3_gadget_init(&appledwc->dwc);  in dwc3_apple_init()
274 			dev_err(appledwc->dev, "Failed to initialize gadget, ret=%d\n", ret);  in dwc3_apple_init()
278 	default:  in dwc3_apple_init()
281 		ret = -EINVAL;  in dwc3_apple_init()
285 	appledwc->state = state;  in dwc3_apple_init()
289 	dwc3_core_exit(&appledwc->dwc);  in dwc3_apple_init()
291 	ret_reset = reset_control_assert(appledwc->reset);  in dwc3_apple_init()
293 		dev_warn(appledwc->dev, "Failed to assert reset, err=%d\n", ret_reset);  in dwc3_apple_init()
302 	lockdep_assert_held(&appledwc->lock);  in dwc3_apple_exit()
304 	switch (appledwc->state) {  in dwc3_apple_exit()
310 		dwc3_gadget_exit(&appledwc->dwc);  in dwc3_apple_exit()
313 		dwc3_host_exit(&appledwc->dwc);  in dwc3_apple_exit()
319 	 * and switch dwc3's PIPE interface back to a dummy PHY (i.e. no USB3 support and USB2 via  in dwc3_apple_exit()
322 	dwc3_enable_susphy(&appledwc->dwc, true);  in dwc3_apple_exit()
323 	dwc3_core_exit(&appledwc->dwc);  in dwc3_apple_exit()
324 	appledwc->state = DWC3_APPLE_NO_CABLE;  in dwc3_apple_exit()
326 	ret = reset_control_assert(appledwc->reset);  in dwc3_apple_exit()
328 		dev_err(appledwc->dev, "Failed to assert reset, err=%d\n", ret);  in dwc3_apple_exit()
335 static int dwc3_usb_role_switch_set(struct usb_role_switch *sw, enum usb_role role)  in dwc3_usb_role_switch_set()  argument
340 	guard(mutex)(&appledwc->lock);  in dwc3_usb_role_switch_set()
343 	 * We need to tear all of dwc3 down and re-initialize it every time a cable is  in dwc3_usb_role_switch_set()
344 	 * connected or disconnected or when the mode changes. See the documentation for enum  in dwc3_usb_role_switch_set()
351 	switch (role) {  in dwc3_usb_role_switch_set()
359 	default:  in dwc3_usb_role_switch_set()
360 		dev_err(appledwc->dev, "Invalid target role: %d\n", role);  in dwc3_usb_role_switch_set()
361 		return -EINVAL;  in dwc3_usb_role_switch_set()
369 	guard(mutex)(&appledwc->lock);  in dwc3_usb_role_switch_get()
371 	switch (appledwc->state) {  in dwc3_usb_role_switch_get()
379 	default:  in dwc3_usb_role_switch_get()
381 		dev_err(appledwc->dev, "Invalid internal state: %d\n", appledwc->state);  in dwc3_usb_role_switch_get()
390 	dwc3_role_switch.fwnode = dev_fwnode(appledwc->dev);  in dwc3_apple_setup_role_switch()
394 	appledwc->role_sw = usb_role_switch_register(appledwc->dev, &dwc3_role_switch);  in dwc3_apple_setup_role_switch()
395 	if (IS_ERR(appledwc->role_sw))  in dwc3_apple_setup_role_switch()
396 		return PTR_ERR(appledwc->role_sw);  in dwc3_apple_setup_role_switch()
403 	struct device *dev = &pdev->dev;  in dwc3_apple_probe()
407 	appledwc = devm_kzalloc(&pdev->dev, sizeof(*appledwc), GFP_KERNEL);  in dwc3_apple_probe()
409 		return -ENOMEM;  in dwc3_apple_probe()
411 	appledwc->dev = &pdev->dev;  in dwc3_apple_probe()
412 	mutex_init(&appledwc->lock);  in dwc3_apple_probe()
414 	appledwc->reset = devm_reset_control_get_exclusive(dev, NULL);  in dwc3_apple_probe()
415 	if (IS_ERR(appledwc->reset))  in dwc3_apple_probe()
416 		return dev_err_probe(&pdev->dev, PTR_ERR(appledwc->reset),  in dwc3_apple_probe()
419 	ret = reset_control_assert(appledwc->reset);  in dwc3_apple_probe()
421 		dev_err(&pdev->dev, "Failed to assert reset, err=%d\n", ret);  in dwc3_apple_probe()
425 	appledwc->mmio_resource = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dwc3-core");  in dwc3_apple_probe()
426 	if (!appledwc->mmio_resource) {  in dwc3_apple_probe()
428 		return -EINVAL;  in dwc3_apple_probe()
431 	appledwc->apple_regs = devm_platform_ioremap_resource_byname(pdev, "dwc3-apple");  in dwc3_apple_probe()
432 	if (IS_ERR(appledwc->apple_regs))  in dwc3_apple_probe()
433 		return dev_err_probe(dev, PTR_ERR(appledwc->apple_regs),  in dwc3_apple_probe()
434 				     "Failed to map Apple-specific MMIO\n");  in dwc3_apple_probe()
438 	 * initialized with knowledge of the target mode and cable orientation from typec_set_mux.  in dwc3_apple_probe()
443 	appledwc->state = DWC3_APPLE_PROBE_PENDING;  in dwc3_apple_probe()
446 		return dev_err_probe(&pdev->dev, ret, "Failed to setup role switch\n");  in dwc3_apple_probe()
456 	guard(mutex)(&appledwc->lock);  in dwc3_apple_remove()
458 	usb_role_switch_unregister(appledwc->role_sw);  in dwc3_apple_remove()
466 	if (appledwc->state != DWC3_APPLE_PROBE_PENDING)  in dwc3_apple_remove()
467 		dwc3_core_remove(&appledwc->dwc);  in dwc3_apple_remove()
471 	{ .compatible = "apple,t8103-dwc3" },
480 		.name	= "dwc3-apple",