1 // SPDX-License-Identifier: GPL-2.0+
3  * Samsung Exynos USB HOST EHCI Controller
11 #include <linux/dma-mapping.h>
22 #include "ehci.h"
24 #define DRIVER_DESC "EHCI Exynos driver"
46 #define to_exynos_ehci(hcd) (struct exynos_ehci_hcd *)(hcd_to_ehci(hcd)->priv)
57 	num_phys = of_count_phandle_with_args(dev->of_node, "phys",  in exynos_ehci_get_phy()
58 					      "#phy-cells");  in exynos_ehci_get_phy()
60 		phy = devm_of_phy_get_by_index(dev, dev->of_node, phy_number);  in exynos_ehci_get_phy()
63 		exynos_ehci->phy[phy_number] = phy;  in exynos_ehci_get_phy()
69 	for_each_available_child_of_node(dev->of_node, child) {  in exynos_ehci_get_phy()
80 			return -EINVAL;  in exynos_ehci_get_phy()
84 		exynos_ehci->phy[phy_number] = phy;  in exynos_ehci_get_phy()
91 	exynos_ehci->legacy_phy = true;  in exynos_ehci_get_phy()
103 		ret = phy_power_on(exynos_ehci->phy[i]);  in exynos_ehci_phy_enable()
105 		for (i--; i >= 0; i--)  in exynos_ehci_phy_enable()
106 			phy_power_off(exynos_ehci->phy[i]);  in exynos_ehci_phy_enable()
118 		phy_power_off(exynos_ehci->phy[i]);  in exynos_ehci_phy_disable()
129 		dev_err(dev, "can't request ehci vbus gpio: %d\n", err);  in exynos_setup_vbus_gpio()
136 	struct ehci_hcd *ehci;  in exynos_ehci_probe()  local
142 	 * Right now device-tree probed devices don't get dma_mask set.  in exynos_ehci_probe()
146 	err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));  in exynos_ehci_probe()
150 	exynos_setup_vbus_gpio(&pdev->dev);  in exynos_ehci_probe()
153 			     &pdev->dev, dev_name(&pdev->dev));  in exynos_ehci_probe()
155 		dev_err(&pdev->dev, "Unable to create HCD\n");  in exynos_ehci_probe()
156 		return -ENOMEM;  in exynos_ehci_probe()
160 	err = exynos_ehci_get_phy(&pdev->dev, exynos_ehci);  in exynos_ehci_probe()
164 	exynos_ehci->clk = devm_clk_get(&pdev->dev, "usbhost");  in exynos_ehci_probe()
166 	if (IS_ERR(exynos_ehci->clk)) {  in exynos_ehci_probe()
167 		dev_err(&pdev->dev, "Failed to get usbhost clock\n");  in exynos_ehci_probe()
168 		err = PTR_ERR(exynos_ehci->clk);  in exynos_ehci_probe()
172 	err = clk_prepare_enable(exynos_ehci->clk);  in exynos_ehci_probe()
176 	hcd->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &res);  in exynos_ehci_probe()
177 	if (IS_ERR(hcd->regs)) {  in exynos_ehci_probe()
178 		err = PTR_ERR(hcd->regs);  in exynos_ehci_probe()
182 	hcd->rsrc_start = res->start;  in exynos_ehci_probe()
183 	hcd->rsrc_len = resource_size(res);  in exynos_ehci_probe()
191 	err = exynos_ehci_phy_enable(&pdev->dev);  in exynos_ehci_probe()
193 		dev_err(&pdev->dev, "Failed to enable USB phy\n");  in exynos_ehci_probe()
197 	ehci = hcd_to_ehci(hcd);  in exynos_ehci_probe()
198 	ehci->caps = hcd->regs;  in exynos_ehci_probe()
202 	 * Exynos EHCI port subnodes and generic USB device bindings  in exynos_ehci_probe()
204 	exynos_ehci->of_node = pdev->dev.of_node;  in exynos_ehci_probe()
205 	if (exynos_ehci->legacy_phy)  in exynos_ehci_probe()
206 		pdev->dev.of_node = NULL;  in exynos_ehci_probe()
209 	writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));  in exynos_ehci_probe()
213 		dev_err(&pdev->dev, "Failed to add USB HCD\n");  in exynos_ehci_probe()
216 	device_wakeup_enable(hcd->self.controller);  in exynos_ehci_probe()
223 	exynos_ehci_phy_disable(&pdev->dev);  in exynos_ehci_probe()
224 	pdev->dev.of_node = exynos_ehci->of_node;  in exynos_ehci_probe()
226 	clk_disable_unprepare(exynos_ehci->clk);  in exynos_ehci_probe()
237 	pdev->dev.of_node = exynos_ehci->of_node;  in exynos_ehci_remove()
241 	exynos_ehci_phy_disable(&pdev->dev);  in exynos_ehci_remove()
243 	clk_disable_unprepare(exynos_ehci->clk);  in exynos_ehci_remove()
263 	clk_disable_unprepare(exynos_ehci->clk);  in exynos_ehci_suspend()
274 	ret = clk_prepare_enable(exynos_ehci->clk);  in exynos_ehci_resume()
281 		clk_disable_unprepare(exynos_ehci->clk);  in exynos_ehci_resume()
286 	writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));  in exynos_ehci_resume()
303 	{ .compatible = "samsung,exynos4210-ehci" },
314 		.name	= "exynos-ehci",
326 		return -ENODEV;  in ehci_exynos_init()
340 MODULE_ALIAS("platform:exynos-ehci");