1 /* 2 * SAMSUNG EXYNOS USB HOST OHCI Controller 3 * 4 * Copyright (C) 2011 Samsung Electronics Co.Ltd 5 * Author: Jingoo Han <jg1.han@samsung.com> 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License as published by the 9 * Free Software Foundation; either version 2 of the License, or (at your 10 * option) any later version. 11 * 12 */ 13 14 #include <linux/clk.h> 15 #include <linux/dma-mapping.h> 16 #include <linux/io.h> 17 #include <linux/kernel.h> 18 #include <linux/module.h> 19 #include <linux/of.h> 20 #include <linux/platform_device.h> 21 #include <linux/usb/phy.h> 22 #include <linux/usb/samsung_usb_phy.h> 23 #include <linux/usb.h> 24 #include <linux/usb/hcd.h> 25 #include <linux/usb/otg.h> 26 27 #include "ohci.h" 28 29 #define DRIVER_DESC "OHCI EXYNOS driver" 30 31 static const char hcd_name[] = "ohci-exynos"; 32 static struct hc_driver __read_mostly exynos_ohci_hc_driver; 33 34 #define to_exynos_ohci(hcd) (struct exynos_ohci_hcd *)(hcd_to_ohci(hcd)->priv) 35 36 struct exynos_ohci_hcd { 37 struct clk *clk; 38 struct usb_phy *phy; 39 struct usb_otg *otg; 40 }; 41 42 static void exynos_ohci_phy_enable(struct platform_device *pdev) 43 { 44 struct usb_hcd *hcd = platform_get_drvdata(pdev); 45 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd); 46 47 if (exynos_ohci->phy) 48 usb_phy_init(exynos_ohci->phy); 49 } 50 51 static void exynos_ohci_phy_disable(struct platform_device *pdev) 52 { 53 struct usb_hcd *hcd = platform_get_drvdata(pdev); 54 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd); 55 56 if (exynos_ohci->phy) 57 usb_phy_shutdown(exynos_ohci->phy); 58 } 59 60 static int exynos_ohci_probe(struct platform_device *pdev) 61 { 62 struct exynos_ohci_hcd *exynos_ohci; 63 struct usb_hcd *hcd; 64 struct resource *res; 65 struct usb_phy *phy; 66 int irq; 67 int err; 68 69 /* 70 * Right now device-tree probed devices don't get dma_mask set. 71 * Since shared usb code relies on it, set it here for now. 72 * Once we move to full device tree support this will vanish off. 73 */ 74 err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); 75 if (err) 76 return err; 77 78 hcd = usb_create_hcd(&exynos_ohci_hc_driver, 79 &pdev->dev, dev_name(&pdev->dev)); 80 if (!hcd) { 81 dev_err(&pdev->dev, "Unable to create HCD\n"); 82 return -ENOMEM; 83 } 84 85 exynos_ohci = to_exynos_ohci(hcd); 86 87 if (of_device_is_compatible(pdev->dev.of_node, 88 "samsung,exynos5440-ohci")) 89 goto skip_phy; 90 91 phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2); 92 if (IS_ERR(phy)) { 93 usb_put_hcd(hcd); 94 dev_warn(&pdev->dev, "no platform data or transceiver defined\n"); 95 return -EPROBE_DEFER; 96 } else { 97 exynos_ohci->phy = phy; 98 exynos_ohci->otg = phy->otg; 99 } 100 101 skip_phy: 102 exynos_ohci->clk = devm_clk_get(&pdev->dev, "usbhost"); 103 104 if (IS_ERR(exynos_ohci->clk)) { 105 dev_err(&pdev->dev, "Failed to get usbhost clock\n"); 106 err = PTR_ERR(exynos_ohci->clk); 107 goto fail_clk; 108 } 109 110 err = clk_prepare_enable(exynos_ohci->clk); 111 if (err) 112 goto fail_clk; 113 114 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 115 if (!res) { 116 dev_err(&pdev->dev, "Failed to get I/O memory\n"); 117 err = -ENXIO; 118 goto fail_io; 119 } 120 121 hcd->rsrc_start = res->start; 122 hcd->rsrc_len = resource_size(res); 123 hcd->regs = devm_ioremap(&pdev->dev, res->start, hcd->rsrc_len); 124 if (!hcd->regs) { 125 dev_err(&pdev->dev, "Failed to remap I/O memory\n"); 126 err = -ENOMEM; 127 goto fail_io; 128 } 129 130 irq = platform_get_irq(pdev, 0); 131 if (!irq) { 132 dev_err(&pdev->dev, "Failed to get IRQ\n"); 133 err = -ENODEV; 134 goto fail_io; 135 } 136 137 if (exynos_ohci->otg) 138 exynos_ohci->otg->set_host(exynos_ohci->otg, &hcd->self); 139 140 platform_set_drvdata(pdev, hcd); 141 142 exynos_ohci_phy_enable(pdev); 143 144 err = usb_add_hcd(hcd, irq, IRQF_SHARED); 145 if (err) { 146 dev_err(&pdev->dev, "Failed to add USB HCD\n"); 147 goto fail_add_hcd; 148 } 149 device_wakeup_enable(hcd->self.controller); 150 return 0; 151 152 fail_add_hcd: 153 exynos_ohci_phy_disable(pdev); 154 fail_io: 155 clk_disable_unprepare(exynos_ohci->clk); 156 fail_clk: 157 usb_put_hcd(hcd); 158 return err; 159 } 160 161 static int exynos_ohci_remove(struct platform_device *pdev) 162 { 163 struct usb_hcd *hcd = platform_get_drvdata(pdev); 164 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd); 165 166 usb_remove_hcd(hcd); 167 168 if (exynos_ohci->otg) 169 exynos_ohci->otg->set_host(exynos_ohci->otg, &hcd->self); 170 171 exynos_ohci_phy_disable(pdev); 172 173 clk_disable_unprepare(exynos_ohci->clk); 174 175 usb_put_hcd(hcd); 176 177 return 0; 178 } 179 180 static void exynos_ohci_shutdown(struct platform_device *pdev) 181 { 182 struct usb_hcd *hcd = platform_get_drvdata(pdev); 183 184 if (hcd->driver->shutdown) 185 hcd->driver->shutdown(hcd); 186 } 187 188 #ifdef CONFIG_PM 189 static int exynos_ohci_suspend(struct device *dev) 190 { 191 struct usb_hcd *hcd = dev_get_drvdata(dev); 192 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd); 193 struct ohci_hcd *ohci = hcd_to_ohci(hcd); 194 struct platform_device *pdev = to_platform_device(dev); 195 bool do_wakeup = device_may_wakeup(dev); 196 unsigned long flags; 197 int rc = ohci_suspend(hcd, do_wakeup); 198 199 if (rc) 200 return rc; 201 202 spin_lock_irqsave(&ohci->lock, flags); 203 204 if (exynos_ohci->otg) 205 exynos_ohci->otg->set_host(exynos_ohci->otg, &hcd->self); 206 207 exynos_ohci_phy_disable(pdev); 208 209 clk_disable_unprepare(exynos_ohci->clk); 210 211 spin_unlock_irqrestore(&ohci->lock, flags); 212 213 return 0; 214 } 215 216 static int exynos_ohci_resume(struct device *dev) 217 { 218 struct usb_hcd *hcd = dev_get_drvdata(dev); 219 struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd); 220 struct platform_device *pdev = to_platform_device(dev); 221 222 clk_prepare_enable(exynos_ohci->clk); 223 224 if (exynos_ohci->otg) 225 exynos_ohci->otg->set_host(exynos_ohci->otg, &hcd->self); 226 227 exynos_ohci_phy_enable(pdev); 228 229 ohci_resume(hcd, false); 230 231 return 0; 232 } 233 #else 234 #define exynos_ohci_suspend NULL 235 #define exynos_ohci_resume NULL 236 #endif 237 238 static const struct ohci_driver_overrides exynos_overrides __initconst = { 239 .extra_priv_size = sizeof(struct exynos_ohci_hcd), 240 }; 241 242 static const struct dev_pm_ops exynos_ohci_pm_ops = { 243 .suspend = exynos_ohci_suspend, 244 .resume = exynos_ohci_resume, 245 }; 246 247 #ifdef CONFIG_OF 248 static const struct of_device_id exynos_ohci_match[] = { 249 { .compatible = "samsung,exynos4210-ohci" }, 250 { .compatible = "samsung,exynos5440-ohci" }, 251 {}, 252 }; 253 MODULE_DEVICE_TABLE(of, exynos_ohci_match); 254 #endif 255 256 static struct platform_driver exynos_ohci_driver = { 257 .probe = exynos_ohci_probe, 258 .remove = exynos_ohci_remove, 259 .shutdown = exynos_ohci_shutdown, 260 .driver = { 261 .name = "exynos-ohci", 262 .owner = THIS_MODULE, 263 .pm = &exynos_ohci_pm_ops, 264 .of_match_table = of_match_ptr(exynos_ohci_match), 265 } 266 }; 267 static int __init ohci_exynos_init(void) 268 { 269 if (usb_disabled()) 270 return -ENODEV; 271 272 pr_info("%s: " DRIVER_DESC "\n", hcd_name); 273 ohci_init_driver(&exynos_ohci_hc_driver, &exynos_overrides); 274 return platform_driver_register(&exynos_ohci_driver); 275 } 276 module_init(ohci_exynos_init); 277 278 static void __exit ohci_exynos_cleanup(void) 279 { 280 platform_driver_unregister(&exynos_ohci_driver); 281 } 282 module_exit(ohci_exynos_cleanup); 283 284 MODULE_ALIAS("platform:exynos-ohci"); 285 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>"); 286 MODULE_LICENSE("GPL v2"); 287