1 // SPDX-License-Identifier: GPL-2.0
3  * PolarFire SoC (MPFS) MUSB Glue Layer
5  * Copyright (c) 2020-2022 Microchip Corporation. All rights reserved.
11 #include <linux/dma-mapping.h>
17 #include <linux/usb/usb_phy_generic.h>
57 	spin_lock_irqsave(&musb->lock, flags);  in mpfs_musb_interrupt()
59 	musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);  in mpfs_musb_interrupt()
60 	musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);  in mpfs_musb_interrupt()
61 	musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);  in mpfs_musb_interrupt()
63 	if (musb->int_usb || musb->int_tx || musb->int_rx) {  in mpfs_musb_interrupt()
64 		musb_writeb(musb->mregs, MUSB_INTRUSB, musb->int_usb);  in mpfs_musb_interrupt()
65 		musb_writew(musb->mregs, MUSB_INTRTX, musb->int_tx);  in mpfs_musb_interrupt()
66 		musb_writew(musb->mregs, MUSB_INTRRX, musb->int_rx);  in mpfs_musb_interrupt()
70 	spin_unlock_irqrestore(&musb->lock, flags);  in mpfs_musb_interrupt()
84 	devctl = musb_readb(musb->mregs, MUSB_DEVCTL);  in mpfs_musb_set_vbus()
87 		musb->is_active = 1;  in mpfs_musb_set_vbus()
88 		musb->xceiv->otg->default_a = 1;  in mpfs_musb_set_vbus()
89 		musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE;  in mpfs_musb_set_vbus()
93 		musb->is_active = 0;  in mpfs_musb_set_vbus()
96 		 * NOTE:  skipping A_WAIT_VFALL -> A_IDLE and  in mpfs_musb_set_vbus()
99 		musb->xceiv->otg->default_a = 0;  in mpfs_musb_set_vbus()
100 		musb->xceiv->otg->state = OTG_STATE_B_IDLE;  in mpfs_musb_set_vbus()
106 	musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);  in mpfs_musb_set_vbus()
108 	dev_dbg(musb->controller, "VBUS %s, devctl %02x\n",  in mpfs_musb_set_vbus()
109 		usb_otg_state_string(musb->xceiv->otg->state),  in mpfs_musb_set_vbus()
110 		musb_readb(musb->mregs, MUSB_DEVCTL));  in mpfs_musb_set_vbus()
115 	struct device *dev = musb->controller;  in mpfs_musb_init()
117 	musb->xceiv = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);  in mpfs_musb_init()
118 	if (IS_ERR(musb->xceiv)) {  in mpfs_musb_init()
120 		return PTR_ERR(musb->xceiv);  in mpfs_musb_init()
123 	musb->dyn_fifo = true;  in mpfs_musb_init()
124 	musb->isr = mpfs_musb_interrupt;  in mpfs_musb_init()
144 	struct musb_hdrc_platform_data *pdata = dev_get_platdata(&pdev->dev);  in mpfs_probe()
145 	struct mpfs_glue *glue;  in mpfs_probe()  local
147 	struct device *dev = &pdev->dev;  in mpfs_probe()
151 	glue = devm_kzalloc(dev, sizeof(*glue), GFP_KERNEL);  in mpfs_probe()
152 	if (!glue)  in mpfs_probe()
153 		return -ENOMEM;  in mpfs_probe()
155 	musb_pdev = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);  in mpfs_probe()
158 		return -ENOMEM;  in mpfs_probe()
161 	clk = devm_clk_get(&pdev->dev, NULL);  in mpfs_probe()
163 		dev_err(&pdev->dev, "failed to get clock\n");  in mpfs_probe()
170 		dev_err(&pdev->dev, "failed to enable clock\n");  in mpfs_probe()
174 	musb_pdev->dev.parent = dev;  in mpfs_probe()
175 	musb_pdev->dev.coherent_dma_mask = DMA_BIT_MASK(39);  in mpfs_probe()
176 	musb_pdev->dev.dma_mask = &musb_pdev->dev.coherent_dma_mask;  in mpfs_probe()
177 	device_set_of_node_from_dev(&musb_pdev->dev, dev);  in mpfs_probe()
179 	glue->dev = dev;  in mpfs_probe()
180 	glue->musb = musb_pdev;  in mpfs_probe()
181 	glue->clk = clk;  in mpfs_probe()
185 		ret = -ENOMEM;  in mpfs_probe()
189 	pdata->config = &mpfs_musb_hdrc_config;  in mpfs_probe()
190 	pdata->platform_ops = &mpfs_ops;  in mpfs_probe()
192 	pdata->mode = usb_get_dr_mode(dev);  in mpfs_probe()
193 	if (pdata->mode == USB_DR_MODE_UNKNOWN) {  in mpfs_probe()
195 		pdata->mode = USB_DR_MODE_OTG;  in mpfs_probe()
198 	glue->phy = usb_phy_generic_register();  in mpfs_probe()
199 	if (IS_ERR(glue->phy)) {  in mpfs_probe()
200 		dev_err(dev, "failed to register usb-phy %ld\n",  in mpfs_probe()
201 			PTR_ERR(glue->phy));  in mpfs_probe()
202 		ret = PTR_ERR(glue->phy);  in mpfs_probe()
206 	platform_set_drvdata(pdev, glue);  in mpfs_probe()
208 	ret = platform_device_add_resources(musb_pdev, pdev->resource, pdev->num_resources);  in mpfs_probe()
226 	dev_info(&pdev->dev, "Registered MPFS MUSB driver\n");  in mpfs_probe()
233 	usb_phy_generic_unregister(glue->phy);  in mpfs_probe()
240 	struct mpfs_glue *glue = platform_get_drvdata(pdev);  in mpfs_remove()  local
242 	clk_disable_unprepare(glue->clk);  in mpfs_remove()
243 	platform_device_unregister(glue->musb);  in mpfs_remove()
251 	{ .compatible = "microchip,mpfs-musb" },
261 		.name = "mpfs-musb",
268 MODULE_DESCRIPTION("PolarFire SoC MUSB Glue Layer");