1 // SPDX-License-Identifier: GPL-2.0-only
3  * Copyright (c) 2015-2021, The Linux Foundation. All rights reserved.
46 	writel(EUD_ENABLE, priv->base + EUD_REG_CSR_EUD_EN);  in enable_eud()
48 			priv->base + EUD_REG_INT1_EN_MASK);  in enable_eud()
49 	writel(1, priv->mode_mgr + EUD_REG_EUD_EN2);  in enable_eud()
51 	return usb_role_switch_set_role(priv->role_sw, USB_ROLE_DEVICE);  in enable_eud()
56 	writel(0, priv->base + EUD_REG_CSR_EUD_EN);  in disable_eud()
57 	writel(0, priv->mode_mgr + EUD_REG_EUD_EN2);  in disable_eud()
63 	struct eud_chip *chip = dev_get_drvdata(dev);  in enable_show()  local
65 	return sysfs_emit(buf, "%d\n", chip->enabled);  in enable_show()
72 	struct eud_chip *chip = dev_get_drvdata(dev);  in enable_store()  local
77 		return -EINVAL;  in enable_store()
80 		ret = enable_eud(chip);  in enable_store()
82 			chip->enabled = enable;  in enable_store()
84 			disable_eud(chip);  in enable_store()
86 		disable_eud(chip);  in enable_store()
100 static void usb_attach_detach(struct eud_chip *chip)  in usb_attach_detach()  argument
104 	/* read ctl_out_1[4] to find USB attach or detach event */  in usb_attach_detach()
105 	reg = readl(chip->base + EUD_REG_CTL_OUT_1);  in usb_attach_detach()
106 	chip->usb_attached = reg & EUD_INT_SAFE_MODE;  in usb_attach_detach()
109 static void pet_eud(struct eud_chip *chip)  in pet_eud()  argument
115 	 * disconnected and we need to detach the pet to check if EUD is in safe  in pet_eud()
118 	reg = readl(chip->base + EUD_REG_SW_ATTACH_DET);  in pet_eud()
121 		writel(0, chip->base + EUD_REG_SW_ATTACH_DET);  in pet_eud()
122 		/* Delay to make sure detach pet is done before attach pet */  in pet_eud()
123 		ret = readl_poll_timeout(chip->base + EUD_REG_SW_ATTACH_DET,  in pet_eud()
126 			dev_err(chip->dev, "Detach pet failed\n");  in pet_eud()
131 	writel(EUD_INT_PET_EUD, chip->base + EUD_REG_SW_ATTACH_DET);  in pet_eud()
136 	struct eud_chip *chip = data;  in handle_eud_irq()  local
139 	reg = readl(chip->base + EUD_REG_INT_STATUS_1);  in handle_eud_irq()
142 		usb_attach_detach(chip);  in handle_eud_irq()
145 		pet_eud(chip);  in handle_eud_irq()
154 	struct eud_chip *chip = data;  in handle_eud_irq_thread()  local
157 	if (chip->usb_attached)  in handle_eud_irq_thread()
158 		ret = usb_role_switch_set_role(chip->role_sw, USB_ROLE_DEVICE);  in handle_eud_irq_thread()
160 		ret = usb_role_switch_set_role(chip->role_sw, USB_ROLE_HOST);  in handle_eud_irq_thread()
162 		dev_err(chip->dev, "failed to set role switch\n");  in handle_eud_irq_thread()
164 	/* set and clear vbus_int_clr[0] to clear interrupt */  in handle_eud_irq_thread()
165 	writel(BIT(0), chip->base + EUD_REG_VBUS_INT_CLR);  in handle_eud_irq_thread()
166 	writel(0, chip->base + EUD_REG_VBUS_INT_CLR);  in handle_eud_irq_thread()
173 	struct eud_chip *chip = data;  in eud_role_switch_release()  local
175 	usb_role_switch_put(chip->role_sw);  in eud_role_switch_release()
180 	struct eud_chip *chip;  in eud_probe()  local
183 	chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);  in eud_probe()
184 	if (!chip)  in eud_probe()
185 		return -ENOMEM;  in eud_probe()
187 	chip->dev = &pdev->dev;  in eud_probe()
189 	chip->role_sw = usb_role_switch_get(&pdev->dev);  in eud_probe()
190 	if (IS_ERR(chip->role_sw))  in eud_probe()
191 		return dev_err_probe(chip->dev, PTR_ERR(chip->role_sw),  in eud_probe()
192 					"failed to get role switch\n");  in eud_probe()
194 	ret = devm_add_action_or_reset(chip->dev, eud_role_switch_release, chip);  in eud_probe()
196 		return dev_err_probe(chip->dev, ret,  in eud_probe()
197 				"failed to add role switch release action\n");  in eud_probe()
199 	chip->base = devm_platform_ioremap_resource(pdev, 0);  in eud_probe()
200 	if (IS_ERR(chip->base))  in eud_probe()
201 		return PTR_ERR(chip->base);  in eud_probe()
203 	chip->mode_mgr = devm_platform_ioremap_resource(pdev, 1);  in eud_probe()
204 	if (IS_ERR(chip->mode_mgr))  in eud_probe()
205 		return PTR_ERR(chip->mode_mgr);  in eud_probe()
207 	chip->irq = platform_get_irq(pdev, 0);  in eud_probe()
208 	if (chip->irq < 0)  in eud_probe()
209 		return chip->irq;  in eud_probe()
211 	ret = devm_request_threaded_irq(&pdev->dev, chip->irq, handle_eud_irq,  in eud_probe()
212 			handle_eud_irq_thread, IRQF_ONESHOT, NULL, chip);  in eud_probe()
214 		return dev_err_probe(chip->dev, ret, "failed to allocate irq\n");  in eud_probe()
216 	enable_irq_wake(chip->irq);  in eud_probe()
218 	platform_set_drvdata(pdev, chip);  in eud_probe()
225 	struct eud_chip *chip = platform_get_drvdata(pdev);  in eud_remove()  local
227 	if (chip->enabled)  in eud_remove()
228 		disable_eud(chip);  in eud_remove()
230 	device_init_wakeup(&pdev->dev, false);  in eud_remove()
231 	disable_irq_wake(chip->irq);  in eud_remove()