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/of.h> 16 #include <linux/platform_device.h> 17 #include <linux/platform_data/usb-ohci-exynos.h> 18 #include <linux/usb/phy.h> 19 #include <linux/usb/samsung_usb_phy.h> 20 21 struct exynos_ohci_hcd { 22 struct device *dev; 23 struct usb_hcd *hcd; 24 struct clk *clk; 25 struct usb_phy *phy; 26 struct usb_otg *otg; 27 struct exynos4_ohci_platdata *pdata; 28 }; 29 30 static void exynos_ohci_phy_enable(struct exynos_ohci_hcd *exynos_ohci) 31 { 32 struct platform_device *pdev = to_platform_device(exynos_ohci->dev); 33 34 if (exynos_ohci->phy) 35 usb_phy_init(exynos_ohci->phy); 36 else if (exynos_ohci->pdata && exynos_ohci->pdata->phy_init) 37 exynos_ohci->pdata->phy_init(pdev, USB_PHY_TYPE_HOST); 38 } 39 40 static void exynos_ohci_phy_disable(struct exynos_ohci_hcd *exynos_ohci) 41 { 42 struct platform_device *pdev = to_platform_device(exynos_ohci->dev); 43 44 if (exynos_ohci->phy) 45 usb_phy_shutdown(exynos_ohci->phy); 46 else if (exynos_ohci->pdata && exynos_ohci->pdata->phy_exit) 47 exynos_ohci->pdata->phy_exit(pdev, USB_PHY_TYPE_HOST); 48 } 49 50 static int ohci_exynos_reset(struct usb_hcd *hcd) 51 { 52 return ohci_init(hcd_to_ohci(hcd)); 53 } 54 55 static int ohci_exynos_start(struct usb_hcd *hcd) 56 { 57 struct ohci_hcd *ohci = hcd_to_ohci(hcd); 58 int ret; 59 60 ohci_dbg(ohci, "ohci_exynos_start, ohci:%p", ohci); 61 62 ret = ohci_run(ohci); 63 if (ret < 0) { 64 dev_err(hcd->self.controller, "can't start %s\n", 65 hcd->self.bus_name); 66 ohci_stop(hcd); 67 return ret; 68 } 69 70 return 0; 71 } 72 73 static const struct hc_driver exynos_ohci_hc_driver = { 74 .description = hcd_name, 75 .product_desc = "EXYNOS OHCI Host Controller", 76 .hcd_priv_size = sizeof(struct ohci_hcd), 77 78 .irq = ohci_irq, 79 .flags = HCD_MEMORY|HCD_USB11, 80 81 .reset = ohci_exynos_reset, 82 .start = ohci_exynos_start, 83 .stop = ohci_stop, 84 .shutdown = ohci_shutdown, 85 86 .get_frame_number = ohci_get_frame, 87 88 .urb_enqueue = ohci_urb_enqueue, 89 .urb_dequeue = ohci_urb_dequeue, 90 .endpoint_disable = ohci_endpoint_disable, 91 92 .hub_status_data = ohci_hub_status_data, 93 .hub_control = ohci_hub_control, 94 #ifdef CONFIG_PM 95 .bus_suspend = ohci_bus_suspend, 96 .bus_resume = ohci_bus_resume, 97 #endif 98 .start_port_reset = ohci_start_port_reset, 99 }; 100 101 static int exynos_ohci_probe(struct platform_device *pdev) 102 { 103 struct exynos4_ohci_platdata *pdata = dev_get_platdata(&pdev->dev); 104 struct exynos_ohci_hcd *exynos_ohci; 105 struct usb_hcd *hcd; 106 struct ohci_hcd *ohci; 107 struct resource *res; 108 struct usb_phy *phy; 109 int irq; 110 int err; 111 112 /* 113 * Right now device-tree probed devices don't get dma_mask set. 114 * Since shared usb code relies on it, set it here for now. 115 * Once we move to full device tree support this will vanish off. 116 */ 117 err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); 118 if (err) 119 return err; 120 121 exynos_ohci = devm_kzalloc(&pdev->dev, sizeof(struct exynos_ohci_hcd), 122 GFP_KERNEL); 123 if (!exynos_ohci) 124 return -ENOMEM; 125 126 if (of_device_is_compatible(pdev->dev.of_node, 127 "samsung,exynos5440-ohci")) 128 goto skip_phy; 129 130 phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2); 131 if (IS_ERR(phy)) { 132 /* Fallback to pdata */ 133 if (!pdata) { 134 dev_warn(&pdev->dev, "no platform data or transceiver defined\n"); 135 return -EPROBE_DEFER; 136 } else { 137 exynos_ohci->pdata = pdata; 138 } 139 } else { 140 exynos_ohci->phy = phy; 141 exynos_ohci->otg = phy->otg; 142 } 143 144 skip_phy: 145 146 exynos_ohci->dev = &pdev->dev; 147 148 hcd = usb_create_hcd(&exynos_ohci_hc_driver, &pdev->dev, 149 dev_name(&pdev->dev)); 150 if (!hcd) { 151 dev_err(&pdev->dev, "Unable to create HCD\n"); 152 return -ENOMEM; 153 } 154 155 exynos_ohci->hcd = hcd; 156 exynos_ohci->clk = devm_clk_get(&pdev->dev, "usbhost"); 157 158 if (IS_ERR(exynos_ohci->clk)) { 159 dev_err(&pdev->dev, "Failed to get usbhost clock\n"); 160 err = PTR_ERR(exynos_ohci->clk); 161 goto fail_clk; 162 } 163 164 err = clk_prepare_enable(exynos_ohci->clk); 165 if (err) 166 goto fail_clk; 167 168 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 169 if (!res) { 170 dev_err(&pdev->dev, "Failed to get I/O memory\n"); 171 err = -ENXIO; 172 goto fail_io; 173 } 174 175 hcd->rsrc_start = res->start; 176 hcd->rsrc_len = resource_size(res); 177 hcd->regs = devm_ioremap(&pdev->dev, res->start, hcd->rsrc_len); 178 if (!hcd->regs) { 179 dev_err(&pdev->dev, "Failed to remap I/O memory\n"); 180 err = -ENOMEM; 181 goto fail_io; 182 } 183 184 irq = platform_get_irq(pdev, 0); 185 if (!irq) { 186 dev_err(&pdev->dev, "Failed to get IRQ\n"); 187 err = -ENODEV; 188 goto fail_io; 189 } 190 191 if (exynos_ohci->otg) 192 exynos_ohci->otg->set_host(exynos_ohci->otg, 193 &exynos_ohci->hcd->self); 194 195 exynos_ohci_phy_enable(exynos_ohci); 196 197 ohci = hcd_to_ohci(hcd); 198 ohci_hcd_init(ohci); 199 200 err = usb_add_hcd(hcd, irq, IRQF_SHARED); 201 if (err) { 202 dev_err(&pdev->dev, "Failed to add USB HCD\n"); 203 goto fail_add_hcd; 204 } 205 206 platform_set_drvdata(pdev, exynos_ohci); 207 208 return 0; 209 210 fail_add_hcd: 211 exynos_ohci_phy_disable(exynos_ohci); 212 fail_io: 213 clk_disable_unprepare(exynos_ohci->clk); 214 fail_clk: 215 usb_put_hcd(hcd); 216 return err; 217 } 218 219 static int exynos_ohci_remove(struct platform_device *pdev) 220 { 221 struct exynos_ohci_hcd *exynos_ohci = platform_get_drvdata(pdev); 222 struct usb_hcd *hcd = exynos_ohci->hcd; 223 224 usb_remove_hcd(hcd); 225 226 if (exynos_ohci->otg) 227 exynos_ohci->otg->set_host(exynos_ohci->otg, 228 &exynos_ohci->hcd->self); 229 230 exynos_ohci_phy_disable(exynos_ohci); 231 232 clk_disable_unprepare(exynos_ohci->clk); 233 234 usb_put_hcd(hcd); 235 236 return 0; 237 } 238 239 static void exynos_ohci_shutdown(struct platform_device *pdev) 240 { 241 struct exynos_ohci_hcd *exynos_ohci = platform_get_drvdata(pdev); 242 struct usb_hcd *hcd = exynos_ohci->hcd; 243 244 if (hcd->driver->shutdown) 245 hcd->driver->shutdown(hcd); 246 } 247 248 #ifdef CONFIG_PM 249 static int exynos_ohci_suspend(struct device *dev) 250 { 251 struct exynos_ohci_hcd *exynos_ohci = dev_get_drvdata(dev); 252 struct usb_hcd *hcd = exynos_ohci->hcd; 253 struct ohci_hcd *ohci = hcd_to_ohci(hcd); 254 unsigned long flags; 255 int rc = 0; 256 257 /* 258 * Root hub was already suspended. Disable irq emission and 259 * mark HW unaccessible, bail out if RH has been resumed. Use 260 * the spinlock to properly synchronize with possible pending 261 * RH suspend or resume activity. 262 */ 263 spin_lock_irqsave(&ohci->lock, flags); 264 if (ohci->rh_state != OHCI_RH_SUSPENDED && 265 ohci->rh_state != OHCI_RH_HALTED) { 266 rc = -EINVAL; 267 goto fail; 268 } 269 270 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); 271 272 if (exynos_ohci->otg) 273 exynos_ohci->otg->set_host(exynos_ohci->otg, 274 &exynos_ohci->hcd->self); 275 276 exynos_ohci_phy_disable(exynos_ohci); 277 278 clk_disable_unprepare(exynos_ohci->clk); 279 280 fail: 281 spin_unlock_irqrestore(&ohci->lock, flags); 282 283 return rc; 284 } 285 286 static int exynos_ohci_resume(struct device *dev) 287 { 288 struct exynos_ohci_hcd *exynos_ohci = dev_get_drvdata(dev); 289 struct usb_hcd *hcd = exynos_ohci->hcd; 290 291 clk_prepare_enable(exynos_ohci->clk); 292 293 if (exynos_ohci->otg) 294 exynos_ohci->otg->set_host(exynos_ohci->otg, 295 &exynos_ohci->hcd->self); 296 297 exynos_ohci_phy_enable(exynos_ohci); 298 299 ohci_resume(hcd, false); 300 301 return 0; 302 } 303 #else 304 #define exynos_ohci_suspend NULL 305 #define exynos_ohci_resume NULL 306 #endif 307 308 static const struct dev_pm_ops exynos_ohci_pm_ops = { 309 .suspend = exynos_ohci_suspend, 310 .resume = exynos_ohci_resume, 311 }; 312 313 #ifdef CONFIG_OF 314 static const struct of_device_id exynos_ohci_match[] = { 315 { .compatible = "samsung,exynos4210-ohci" }, 316 { .compatible = "samsung,exynos5440-ohci" }, 317 {}, 318 }; 319 MODULE_DEVICE_TABLE(of, exynos_ohci_match); 320 #endif 321 322 static struct platform_driver exynos_ohci_driver = { 323 .probe = exynos_ohci_probe, 324 .remove = exynos_ohci_remove, 325 .shutdown = exynos_ohci_shutdown, 326 .driver = { 327 .name = "exynos-ohci", 328 .owner = THIS_MODULE, 329 .pm = &exynos_ohci_pm_ops, 330 .of_match_table = of_match_ptr(exynos_ohci_match), 331 } 332 }; 333 334 MODULE_ALIAS("platform:exynos-ohci"); 335 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>"); 336