1 // SPDX-License-Identifier: GPL-2.0
3  * Driver for EHCI UHP on Atmel chips
8  *  Based on various ehci-*.c drivers
12 #include <linux/dma-mapping.h>
19 #include <linux/usb.h>
20 #include <linux/usb/hcd.h>
21 #include <linux/usb/phy.h>
22 #include <linux/usb/of.h>
24 #include "ehci.h"
26 #define DRIVER_DESC "EHCI Atmel driver"
33 	((struct atmel_ehci_priv *)hcd_to_ehci(h)->priv)
47 /*-------------------------------------------------------------------------*/
51 	if (atmel_ehci->clocked)  in atmel_start_clock()
54 	clk_prepare_enable(atmel_ehci->uclk);  in atmel_start_clock()
55 	clk_prepare_enable(atmel_ehci->iclk);  in atmel_start_clock()
56 	atmel_ehci->clocked = true;  in atmel_start_clock()
61 	if (!atmel_ehci->clocked)  in atmel_stop_clock()
64 	clk_disable_unprepare(atmel_ehci->iclk);  in atmel_stop_clock()
65 	clk_disable_unprepare(atmel_ehci->uclk);  in atmel_stop_clock()
66 	atmel_ehci->clocked = false;  in atmel_stop_clock()
74 	dev_dbg(&pdev->dev, "start\n");  in atmel_start_ehci()
83 	dev_dbg(&pdev->dev, "stop\n");  in atmel_stop_ehci()
87 /*-------------------------------------------------------------------------*/
94 	struct ehci_hcd *ehci;  in ehci_atmel_drv_probe()  local
100 		return -ENODEV;  in ehci_atmel_drv_probe()
102 	pr_debug("Initializing Atmel-SoC USB Host Controller\n");  in ehci_atmel_drv_probe()
110 	/* Right now device-tree probed devices don't get dma_mask set.  in ehci_atmel_drv_probe()
111 	 * Since shared usb code relies on it, set it here for now.  in ehci_atmel_drv_probe()
114 	retval = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));  in ehci_atmel_drv_probe()
118 	hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));  in ehci_atmel_drv_probe()
120 		retval = -ENOMEM;  in ehci_atmel_drv_probe()
125 	hcd->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &res);  in ehci_atmel_drv_probe()
126 	if (IS_ERR(hcd->regs)) {  in ehci_atmel_drv_probe()
127 		retval = PTR_ERR(hcd->regs);  in ehci_atmel_drv_probe()
131 	hcd->rsrc_start = res->start;  in ehci_atmel_drv_probe()
132 	hcd->rsrc_len = resource_size(res);  in ehci_atmel_drv_probe()
134 	atmel_ehci->iclk = devm_clk_get(&pdev->dev, "ehci_clk");  in ehci_atmel_drv_probe()
135 	if (IS_ERR(atmel_ehci->iclk)) {  in ehci_atmel_drv_probe()
136 		dev_err(&pdev->dev, "Error getting interface clock\n");  in ehci_atmel_drv_probe()
137 		retval = -ENOENT;  in ehci_atmel_drv_probe()
141 	atmel_ehci->uclk = devm_clk_get(&pdev->dev, "usb_clk");  in ehci_atmel_drv_probe()
142 	if (IS_ERR(atmel_ehci->uclk)) {  in ehci_atmel_drv_probe()
143 		dev_err(&pdev->dev, "failed to get uclk\n");  in ehci_atmel_drv_probe()
144 		retval = PTR_ERR(atmel_ehci->uclk);  in ehci_atmel_drv_probe()
148 	ehci = hcd_to_ehci(hcd);  in ehci_atmel_drv_probe()
150 	ehci->caps = hcd->regs;  in ehci_atmel_drv_probe()
157 	device_wakeup_enable(hcd->self.controller);  in ehci_atmel_drv_probe()
159 	if (of_usb_get_phy_mode(pdev->dev.of_node) == USBPHY_INTERFACE_MODE_HSIC)  in ehci_atmel_drv_probe()
160 		writel(EHCI_INSNREG08_HSIC_EN, hcd->regs + EHCI_INSNREG(8));  in ehci_atmel_drv_probe()
169 	dev_err(&pdev->dev, "init %s fail, %d\n",  in ehci_atmel_drv_probe()
170 		dev_name(&pdev->dev), retval);  in ehci_atmel_drv_probe()
211 	{ .compatible = "atmel,at91sam9g45-ehci" },
226 		.name	= "atmel-ehci",
235 		return -ENODEV;  in ehci_atmel_init()
249 MODULE_ALIAS("platform:atmel-ehci");