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>
27 	struct platform_device *musb;  member
56 	struct musb *musb = __hci;  in mpfs_musb_interrupt()  local
58 	spin_lock_irqsave(&musb->lock, flags);  in mpfs_musb_interrupt()
60 	musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);  in mpfs_musb_interrupt()
61 	musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);  in mpfs_musb_interrupt()
62 	musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);  in mpfs_musb_interrupt()
64 	if (musb->int_usb || musb->int_tx || musb->int_rx) {  in mpfs_musb_interrupt()
65 		musb_writeb(musb->mregs, MUSB_INTRUSB, musb->int_usb);  in mpfs_musb_interrupt()
66 		musb_writew(musb->mregs, MUSB_INTRTX, musb->int_tx);  in mpfs_musb_interrupt()
67 		musb_writew(musb->mregs, MUSB_INTRRX, musb->int_rx);  in mpfs_musb_interrupt()
68 		ret = musb_interrupt(musb);  in mpfs_musb_interrupt()
71 	spin_unlock_irqrestore(&musb->lock, flags);  in mpfs_musb_interrupt()
76 static void mpfs_musb_set_vbus(struct musb *musb, int is_on)  in mpfs_musb_set_vbus()  argument
85 	devctl = musb_readb(musb->mregs, MUSB_DEVCTL);  in mpfs_musb_set_vbus()
88 		musb->is_active = 1;  in mpfs_musb_set_vbus()
89 		musb->xceiv->otg->default_a = 1;  in mpfs_musb_set_vbus()
90 		musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE;  in mpfs_musb_set_vbus()
92 		MUSB_HST_MODE(musb);  in mpfs_musb_set_vbus()
94 		musb->is_active = 0;  in mpfs_musb_set_vbus()
97 		 * NOTE:  skipping A_WAIT_VFALL -> A_IDLE and  in mpfs_musb_set_vbus()
100 		musb->xceiv->otg->default_a = 0;  in mpfs_musb_set_vbus()
101 		musb->xceiv->otg->state = OTG_STATE_B_IDLE;  in mpfs_musb_set_vbus()
104 		MUSB_DEV_MODE(musb);  in mpfs_musb_set_vbus()
107 	musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);  in mpfs_musb_set_vbus()
109 	dev_dbg(musb->controller, "VBUS %s, devctl %02x\n",  in mpfs_musb_set_vbus()
110 		usb_otg_state_string(musb->xceiv->otg->state),  in mpfs_musb_set_vbus()
111 		musb_readb(musb->mregs, MUSB_DEVCTL));  in mpfs_musb_set_vbus()
114 static int mpfs_musb_init(struct musb *musb)  in mpfs_musb_init()  argument
116 	struct device *dev = musb->controller;  in mpfs_musb_init()
118 	musb->xceiv = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);  in mpfs_musb_init()
119 	if (IS_ERR(musb->xceiv)) {  in mpfs_musb_init()
121 		return PTR_ERR(musb->xceiv);  in mpfs_musb_init()
124 	musb->dyn_fifo = true;  in mpfs_musb_init()
125 	musb->isr = mpfs_musb_interrupt;  in mpfs_musb_init()
127 	musb_platform_set_vbus(musb, 1);  in mpfs_musb_init()
145 	struct musb_hdrc_platform_data *pdata = dev_get_platdata(&pdev->dev);  in mpfs_probe()
148 	struct device *dev = &pdev->dev;  in mpfs_probe()
154 		return -ENOMEM;  in mpfs_probe()
156 	musb_pdev = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);  in mpfs_probe()
158 		dev_err(dev, "failed to allocate musb device\n");  in mpfs_probe()
159 		return -ENOMEM;  in mpfs_probe()
162 	clk = devm_clk_get(&pdev->dev, NULL);  in mpfs_probe()
164 		dev_err(&pdev->dev, "failed to get clock\n");  in mpfs_probe()
171 		dev_err(&pdev->dev, "failed to enable clock\n");  in mpfs_probe()
175 	musb_pdev->dev.parent = dev;  in mpfs_probe()
176 	musb_pdev->dev.coherent_dma_mask = DMA_BIT_MASK(39);  in mpfs_probe()
177 	musb_pdev->dev.dma_mask = &musb_pdev->dev.coherent_dma_mask;  in mpfs_probe()
178 	device_set_of_node_from_dev(&musb_pdev->dev, dev);  in mpfs_probe()
180 	glue->dev = dev;  in mpfs_probe()
181 	glue->musb = musb_pdev;  in mpfs_probe()
182 	glue->clk = clk;  in mpfs_probe()
186 		ret = -ENOMEM;  in mpfs_probe()
190 	pdata->config = &mpfs_musb_hdrc_config;  in mpfs_probe()
191 	pdata->platform_ops = &mpfs_ops;  in mpfs_probe()
193 	pdata->mode = usb_get_dr_mode(dev);  in mpfs_probe()
194 	if (pdata->mode == USB_DR_MODE_UNKNOWN) {  in mpfs_probe()
196 		pdata->mode = USB_DR_MODE_OTG;  in mpfs_probe()
199 	glue->phy = usb_phy_generic_register();  in mpfs_probe()
200 	if (IS_ERR(glue->phy)) {  in mpfs_probe()
201 		dev_err(dev, "failed to register usb-phy %ld\n",  in mpfs_probe()
202 			PTR_ERR(glue->phy));  in mpfs_probe()
203 		ret = PTR_ERR(glue->phy);  in mpfs_probe()
209 	ret = platform_device_add_resources(musb_pdev, pdev->resource, pdev->num_resources);  in mpfs_probe()
223 		dev_err(dev, "failed to register musb device\n");  in mpfs_probe()
227 	dev_info(&pdev->dev, "Registered MPFS MUSB driver\n");  in mpfs_probe()
234 	usb_phy_generic_unregister(glue->phy);  in mpfs_probe()
243 	clk_disable_unprepare(glue->clk);  in mpfs_remove()
244 	platform_device_unregister(glue->musb);  in mpfs_remove()
250 	{ .compatible = "microchip,mpfs-musb" },
260 		.name = "mpfs-musb",
267 MODULE_DESCRIPTION("PolarFire SoC MUSB Glue Layer");