1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * SAMSUNG EXYNOS USB HOST OHCI Controller 4 * 5 * Copyright (C) 2011 Samsung Electronics Co.Ltd 6 * Author: Jingoo Han <jg1.han@samsung.com> 7 */ 8 9 #include <linux/clk.h> 10 #include <linux/dma-mapping.h> 11 #include <linux/io.h> 12 #include <linux/kernel.h> 13 #include <linux/module.h> 14 #include <linux/of.h> 15 #include <linux/platform_device.h> 16 #include <linux/phy/phy.h> 17 #include <linux/usb.h> 18 #include <linux/usb/hcd.h> 19 20 #include "ohci.h" 21 22 #define DRIVER_DESC "OHCI Exynos driver" 23 24 static struct hc_driver __read_mostly exynos_ohci_hc_driver; 25 26 #define to_exynos_ohci(hcd) (struct exynos_ohci_hcd *)(hcd_to_ohci(hcd)->priv) 27 28 #define PHY_NUMBER 3 29 30 struct exynos_ohci_hcd { 31 struct clk *clk; 32 struct device_node *of_node; 33 struct phy *phy[PHY_NUMBER]; 34 bool legacy_phy; 35 }; 36 37 static int exynos_ohci_get_phy(struct device *dev, 38 struct exynos_ohci_hcd *exynos_ohci) 39 { 40 struct device_node *child; 41 struct phy *phy; 42 int phy_number, num_phys; 43 int ret; 44 45 /* Get PHYs for the controller */ 46 num_phys = of_count_phandle_with_args(dev->of_node, "phys", 47 "#phy-cells"); 48 for (phy_number = 0; phy_number < num_phys; phy_number++) { 49 phy = devm_of_phy_get_by_index(dev, dev->of_node, phy_number); 50 if (IS_ERR(phy)) 51 return PTR_ERR(phy); 52 exynos_ohci->phy[phy_number] = phy; 53 } 54 if (num_phys > 0) 55 return 0; 56 57 /* Get PHYs using legacy bindings */ 58 for_each_available_child_of_node(dev->of_node, child) { 59 ret = of_property_read_u32(child, "reg", &phy_number); 60 if (ret) { 61 dev_err(dev, "Failed to parse device tree\n"); 62 of_node_put(child); 63 return ret; 64 } 65 66 if (phy_number >= PHY_NUMBER) { 67 dev_err(dev, "Invalid number of PHYs\n"); 68 of_node_put(child); 69 return -EINVAL; 70 } 71 72 phy = devm_of_phy_optional_get(dev, child, NULL); 73 exynos_ohci->phy[phy_number] = phy; 74 if (IS_ERR(phy)) { 75 of_node_put(child); 76 return PTR_ERR(phy); 77 } 78 } 79 80 exynos_ohci->legacy_phy = true; 81 return 0; 82 } 83 84 static int exynos_ohci_phy_enable(struct device *dev) 85 { 86 struct usb_hcd *hcd = dev_get_drvdata(dev); 87 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd); 88 int i; 89 int ret = 0; 90 91 for (i = 0; ret == 0 && i < PHY_NUMBER; i++) 92 ret = phy_power_on(exynos_ohci->phy[i]); 93 if (ret) 94 for (i--; i >= 0; i--) 95 phy_power_off(exynos_ohci->phy[i]); 96 97 return ret; 98 } 99 100 static void exynos_ohci_phy_disable(struct device *dev) 101 { 102 struct usb_hcd *hcd = dev_get_drvdata(dev); 103 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd); 104 int i; 105 106 for (i = 0; i < PHY_NUMBER; i++) 107 phy_power_off(exynos_ohci->phy[i]); 108 } 109 110 static int exynos_ohci_probe(struct platform_device *pdev) 111 { 112 struct exynos_ohci_hcd *exynos_ohci; 113 struct usb_hcd *hcd; 114 struct resource *res; 115 int irq; 116 int err; 117 118 /* 119 * Right now device-tree probed devices don't get dma_mask set. 120 * Since shared usb code relies on it, set it here for now. 121 * Once we move to full device tree support this will vanish off. 122 */ 123 err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); 124 if (err) 125 return err; 126 127 hcd = usb_create_hcd(&exynos_ohci_hc_driver, 128 &pdev->dev, dev_name(&pdev->dev)); 129 if (!hcd) { 130 dev_err(&pdev->dev, "Unable to create HCD\n"); 131 return -ENOMEM; 132 } 133 134 exynos_ohci = to_exynos_ohci(hcd); 135 136 err = exynos_ohci_get_phy(&pdev->dev, exynos_ohci); 137 if (err) 138 goto fail_clk; 139 140 exynos_ohci->clk = devm_clk_get(&pdev->dev, "usbhost"); 141 142 if (IS_ERR(exynos_ohci->clk)) { 143 dev_err(&pdev->dev, "Failed to get usbhost clock\n"); 144 err = PTR_ERR(exynos_ohci->clk); 145 goto fail_clk; 146 } 147 148 err = clk_prepare_enable(exynos_ohci->clk); 149 if (err) 150 goto fail_clk; 151 152 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 153 hcd->regs = devm_ioremap_resource(&pdev->dev, res); 154 if (IS_ERR(hcd->regs)) { 155 err = PTR_ERR(hcd->regs); 156 goto fail_io; 157 } 158 hcd->rsrc_start = res->start; 159 hcd->rsrc_len = resource_size(res); 160 161 irq = platform_get_irq(pdev, 0); 162 if (irq < 0) { 163 err = irq; 164 goto fail_io; 165 } 166 167 platform_set_drvdata(pdev, hcd); 168 169 err = exynos_ohci_phy_enable(&pdev->dev); 170 if (err) { 171 dev_err(&pdev->dev, "Failed to enable USB phy\n"); 172 goto fail_io; 173 } 174 175 /* 176 * Workaround: reset of_node pointer to avoid conflict between legacy 177 * Exynos OHCI port subnodes and generic USB device bindings 178 */ 179 exynos_ohci->of_node = pdev->dev.of_node; 180 if (exynos_ohci->legacy_phy) 181 pdev->dev.of_node = NULL; 182 183 err = usb_add_hcd(hcd, irq, IRQF_SHARED); 184 if (err) { 185 dev_err(&pdev->dev, "Failed to add USB HCD\n"); 186 goto fail_add_hcd; 187 } 188 device_wakeup_enable(hcd->self.controller); 189 return 0; 190 191 fail_add_hcd: 192 exynos_ohci_phy_disable(&pdev->dev); 193 pdev->dev.of_node = exynos_ohci->of_node; 194 fail_io: 195 clk_disable_unprepare(exynos_ohci->clk); 196 fail_clk: 197 usb_put_hcd(hcd); 198 return err; 199 } 200 201 static void exynos_ohci_remove(struct platform_device *pdev) 202 { 203 struct usb_hcd *hcd = platform_get_drvdata(pdev); 204 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd); 205 206 pdev->dev.of_node = exynos_ohci->of_node; 207 208 usb_remove_hcd(hcd); 209 210 exynos_ohci_phy_disable(&pdev->dev); 211 212 clk_disable_unprepare(exynos_ohci->clk); 213 214 usb_put_hcd(hcd); 215 } 216 217 static void exynos_ohci_shutdown(struct platform_device *pdev) 218 { 219 struct usb_hcd *hcd = platform_get_drvdata(pdev); 220 221 if (hcd->driver->shutdown) 222 hcd->driver->shutdown(hcd); 223 } 224 225 #ifdef CONFIG_PM 226 static int exynos_ohci_suspend(struct device *dev) 227 { 228 struct usb_hcd *hcd = dev_get_drvdata(dev); 229 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd); 230 bool do_wakeup = device_may_wakeup(dev); 231 int rc = ohci_suspend(hcd, do_wakeup); 232 233 if (rc) 234 return rc; 235 236 exynos_ohci_phy_disable(dev); 237 238 clk_disable_unprepare(exynos_ohci->clk); 239 240 return 0; 241 } 242 243 static int exynos_ohci_resume(struct device *dev) 244 { 245 struct usb_hcd *hcd = dev_get_drvdata(dev); 246 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd); 247 int ret; 248 249 clk_prepare_enable(exynos_ohci->clk); 250 251 ret = exynos_ohci_phy_enable(dev); 252 if (ret) { 253 dev_err(dev, "Failed to enable USB phy\n"); 254 clk_disable_unprepare(exynos_ohci->clk); 255 return ret; 256 } 257 258 ohci_resume(hcd, false); 259 260 return 0; 261 } 262 #else 263 #define exynos_ohci_suspend NULL 264 #define exynos_ohci_resume NULL 265 #endif 266 267 static const struct ohci_driver_overrides exynos_overrides __initconst = { 268 .extra_priv_size = sizeof(struct exynos_ohci_hcd), 269 }; 270 271 static const struct dev_pm_ops exynos_ohci_pm_ops = { 272 .suspend = exynos_ohci_suspend, 273 .resume = exynos_ohci_resume, 274 }; 275 276 #ifdef CONFIG_OF 277 static const struct of_device_id exynos_ohci_match[] = { 278 { .compatible = "samsung,exynos4210-ohci" }, 279 {}, 280 }; 281 MODULE_DEVICE_TABLE(of, exynos_ohci_match); 282 #endif 283 284 static struct platform_driver exynos_ohci_driver = { 285 .probe = exynos_ohci_probe, 286 .remove_new = exynos_ohci_remove, 287 .shutdown = exynos_ohci_shutdown, 288 .driver = { 289 .name = "exynos-ohci", 290 .pm = &exynos_ohci_pm_ops, 291 .of_match_table = of_match_ptr(exynos_ohci_match), 292 } 293 }; 294 static int __init ohci_exynos_init(void) 295 { 296 if (usb_disabled()) 297 return -ENODEV; 298 299 ohci_init_driver(&exynos_ohci_hc_driver, &exynos_overrides); 300 return platform_driver_register(&exynos_ohci_driver); 301 } 302 module_init(ohci_exynos_init); 303 304 static void __exit ohci_exynos_cleanup(void) 305 { 306 platform_driver_unregister(&exynos_ohci_driver); 307 } 308 module_exit(ohci_exynos_cleanup); 309 310 MODULE_ALIAS("platform:exynos-ohci"); 311 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>"); 312 MODULE_LICENSE("GPL v2"); 313