1 // SPDX-License-Identifier: GPL-2.0+
3  * Samsung Exynos USB HOST EHCI Controller
11 #include <linux/dma-mapping.h>
19 #include <linux/usb.h>
20 #include <linux/usb/hcd.h>
22 #include "ehci.h"
24 #define DRIVER_DESC "EHCI Exynos driver"
35 static const char hcd_name[] = "ehci-exynos";
47 #define to_exynos_ehci(hcd) (struct exynos_ehci_hcd *)(hcd_to_ehci(hcd)->priv)
58 	num_phys = of_count_phandle_with_args(dev->of_node, "phys",  in exynos_ehci_get_phy()
59 					      "#phy-cells");  in exynos_ehci_get_phy()
61 		phy = devm_of_phy_get_by_index(dev, dev->of_node, phy_number);  in exynos_ehci_get_phy()
64 		exynos_ehci->phy[phy_number] = phy;  in exynos_ehci_get_phy()
70 	for_each_available_child_of_node(dev->of_node, child) {  in exynos_ehci_get_phy()
81 			return -EINVAL;  in exynos_ehci_get_phy()
85 		exynos_ehci->phy[phy_number] = phy;  in exynos_ehci_get_phy()
88 			if (ret == -EPROBE_DEFER) {  in exynos_ehci_get_phy()
91 			} else if (ret != -ENOSYS && ret != -ENODEV) {  in exynos_ehci_get_phy()
100 	exynos_ehci->legacy_phy = true;  in exynos_ehci_get_phy()
112 		if (!IS_ERR(exynos_ehci->phy[i]))  in exynos_ehci_phy_enable()
113 			ret = phy_power_on(exynos_ehci->phy[i]);  in exynos_ehci_phy_enable()
115 		for (i--; i >= 0; i--)  in exynos_ehci_phy_enable()
116 			if (!IS_ERR(exynos_ehci->phy[i]))  in exynos_ehci_phy_enable()
117 				phy_power_off(exynos_ehci->phy[i]);  in exynos_ehci_phy_enable()
129 		if (!IS_ERR(exynos_ehci->phy[i]))  in exynos_ehci_phy_disable()
130 			phy_power_off(exynos_ehci->phy[i]);  in exynos_ehci_phy_disable()
138 	if (!dev->of_node)  in exynos_setup_vbus_gpio()
141 	gpio = of_get_named_gpio(dev->of_node, "samsung,vbus-gpio", 0);  in exynos_setup_vbus_gpio()
148 		dev_err(dev, "can't request ehci vbus gpio %d", gpio);  in exynos_setup_vbus_gpio()
155 	struct ehci_hcd *ehci;  in exynos_ehci_probe()  local
161 	 * Right now device-tree probed devices don't get dma_mask set.  in exynos_ehci_probe()
162 	 * Since shared usb code relies on it, set it here for now.  in exynos_ehci_probe()
165 	err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));  in exynos_ehci_probe()
169 	exynos_setup_vbus_gpio(&pdev->dev);  in exynos_ehci_probe()
172 			     &pdev->dev, dev_name(&pdev->dev));  in exynos_ehci_probe()
174 		dev_err(&pdev->dev, "Unable to create HCD\n");  in exynos_ehci_probe()
175 		return -ENOMEM;  in exynos_ehci_probe()
179 	err = exynos_ehci_get_phy(&pdev->dev, exynos_ehci);  in exynos_ehci_probe()
183 	exynos_ehci->clk = devm_clk_get(&pdev->dev, "usbhost");  in exynos_ehci_probe()
185 	if (IS_ERR(exynos_ehci->clk)) {  in exynos_ehci_probe()
186 		dev_err(&pdev->dev, "Failed to get usbhost clock\n");  in exynos_ehci_probe()
187 		err = PTR_ERR(exynos_ehci->clk);  in exynos_ehci_probe()
191 	err = clk_prepare_enable(exynos_ehci->clk);  in exynos_ehci_probe()
196 	hcd->regs = devm_ioremap_resource(&pdev->dev, res);  in exynos_ehci_probe()
197 	if (IS_ERR(hcd->regs)) {  in exynos_ehci_probe()
198 		err = PTR_ERR(hcd->regs);  in exynos_ehci_probe()
202 	hcd->rsrc_start = res->start;  in exynos_ehci_probe()
203 	hcd->rsrc_len = resource_size(res);  in exynos_ehci_probe()
211 	err = exynos_ehci_phy_enable(&pdev->dev);  in exynos_ehci_probe()
213 		dev_err(&pdev->dev, "Failed to enable USB phy\n");  in exynos_ehci_probe()
217 	ehci = hcd_to_ehci(hcd);  in exynos_ehci_probe()
218 	ehci->caps = hcd->regs;  in exynos_ehci_probe()
222 	 * Exynos EHCI port subnodes and generic USB device bindings  in exynos_ehci_probe()
224 	exynos_ehci->of_node = pdev->dev.of_node;  in exynos_ehci_probe()
225 	if (exynos_ehci->legacy_phy)  in exynos_ehci_probe()
226 		pdev->dev.of_node = NULL;  in exynos_ehci_probe()
229 	writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));  in exynos_ehci_probe()
233 		dev_err(&pdev->dev, "Failed to add USB HCD\n");  in exynos_ehci_probe()
236 	device_wakeup_enable(hcd->self.controller);  in exynos_ehci_probe()
243 	exynos_ehci_phy_disable(&pdev->dev);  in exynos_ehci_probe()
244 	pdev->dev.of_node = exynos_ehci->of_node;  in exynos_ehci_probe()
246 	clk_disable_unprepare(exynos_ehci->clk);  in exynos_ehci_probe()
257 	pdev->dev.of_node = exynos_ehci->of_node;  in exynos_ehci_remove()
261 	exynos_ehci_phy_disable(&pdev->dev);  in exynos_ehci_remove()
263 	clk_disable_unprepare(exynos_ehci->clk);  in exynos_ehci_remove()
285 	clk_disable_unprepare(exynos_ehci->clk);  in exynos_ehci_suspend()
296 	ret = clk_prepare_enable(exynos_ehci->clk);  in exynos_ehci_resume()
302 		dev_err(dev, "Failed to enable USB phy\n");  in exynos_ehci_resume()
303 		clk_disable_unprepare(exynos_ehci->clk);  in exynos_ehci_resume()
308 	writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));  in exynos_ehci_resume()
325 	{ .compatible = "samsung,exynos4210-ehci" },
336 		.name	= "exynos-ehci",
348 		return -ENODEV;  in ehci_exynos_init()
363 MODULE_ALIAS("platform:exynos-ehci");