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 if (!pdev->dev.dma_mask) 118 pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask; 119 err = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32)); 120 if (err) 121 return err; 122 123 exynos_ohci = devm_kzalloc(&pdev->dev, sizeof(struct exynos_ohci_hcd), 124 GFP_KERNEL); 125 if (!exynos_ohci) 126 return -ENOMEM; 127 128 if (of_device_is_compatible(pdev->dev.of_node, 129 "samsung,exynos5440-ohci")) 130 goto skip_phy; 131 132 phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2); 133 if (IS_ERR(phy)) { 134 /* Fallback to pdata */ 135 if (!pdata) { 136 dev_warn(&pdev->dev, "no platform data or transceiver defined\n"); 137 return -EPROBE_DEFER; 138 } else { 139 exynos_ohci->pdata = pdata; 140 } 141 } else { 142 exynos_ohci->phy = phy; 143 exynos_ohci->otg = phy->otg; 144 } 145 146 skip_phy: 147 148 exynos_ohci->dev = &pdev->dev; 149 150 hcd = usb_create_hcd(&exynos_ohci_hc_driver, &pdev->dev, 151 dev_name(&pdev->dev)); 152 if (!hcd) { 153 dev_err(&pdev->dev, "Unable to create HCD\n"); 154 return -ENOMEM; 155 } 156 157 exynos_ohci->hcd = hcd; 158 exynos_ohci->clk = devm_clk_get(&pdev->dev, "usbhost"); 159 160 if (IS_ERR(exynos_ohci->clk)) { 161 dev_err(&pdev->dev, "Failed to get usbhost clock\n"); 162 err = PTR_ERR(exynos_ohci->clk); 163 goto fail_clk; 164 } 165 166 err = clk_prepare_enable(exynos_ohci->clk); 167 if (err) 168 goto fail_clk; 169 170 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 171 if (!res) { 172 dev_err(&pdev->dev, "Failed to get I/O memory\n"); 173 err = -ENXIO; 174 goto fail_io; 175 } 176 177 hcd->rsrc_start = res->start; 178 hcd->rsrc_len = resource_size(res); 179 hcd->regs = devm_ioremap(&pdev->dev, res->start, hcd->rsrc_len); 180 if (!hcd->regs) { 181 dev_err(&pdev->dev, "Failed to remap I/O memory\n"); 182 err = -ENOMEM; 183 goto fail_io; 184 } 185 186 irq = platform_get_irq(pdev, 0); 187 if (!irq) { 188 dev_err(&pdev->dev, "Failed to get IRQ\n"); 189 err = -ENODEV; 190 goto fail_io; 191 } 192 193 if (exynos_ohci->otg) 194 exynos_ohci->otg->set_host(exynos_ohci->otg, 195 &exynos_ohci->hcd->self); 196 197 exynos_ohci_phy_enable(exynos_ohci); 198 199 ohci = hcd_to_ohci(hcd); 200 ohci_hcd_init(ohci); 201 202 err = usb_add_hcd(hcd, irq, IRQF_SHARED); 203 if (err) { 204 dev_err(&pdev->dev, "Failed to add USB HCD\n"); 205 goto fail_add_hcd; 206 } 207 208 platform_set_drvdata(pdev, exynos_ohci); 209 210 return 0; 211 212 fail_add_hcd: 213 exynos_ohci_phy_disable(exynos_ohci); 214 fail_io: 215 clk_disable_unprepare(exynos_ohci->clk); 216 fail_clk: 217 usb_put_hcd(hcd); 218 return err; 219 } 220 221 static int exynos_ohci_remove(struct platform_device *pdev) 222 { 223 struct exynos_ohci_hcd *exynos_ohci = platform_get_drvdata(pdev); 224 struct usb_hcd *hcd = exynos_ohci->hcd; 225 226 usb_remove_hcd(hcd); 227 228 if (exynos_ohci->otg) 229 exynos_ohci->otg->set_host(exynos_ohci->otg, 230 &exynos_ohci->hcd->self); 231 232 exynos_ohci_phy_disable(exynos_ohci); 233 234 clk_disable_unprepare(exynos_ohci->clk); 235 236 usb_put_hcd(hcd); 237 238 return 0; 239 } 240 241 static void exynos_ohci_shutdown(struct platform_device *pdev) 242 { 243 struct exynos_ohci_hcd *exynos_ohci = platform_get_drvdata(pdev); 244 struct usb_hcd *hcd = exynos_ohci->hcd; 245 246 if (hcd->driver->shutdown) 247 hcd->driver->shutdown(hcd); 248 } 249 250 #ifdef CONFIG_PM 251 static int exynos_ohci_suspend(struct device *dev) 252 { 253 struct exynos_ohci_hcd *exynos_ohci = dev_get_drvdata(dev); 254 struct usb_hcd *hcd = exynos_ohci->hcd; 255 struct ohci_hcd *ohci = hcd_to_ohci(hcd); 256 unsigned long flags; 257 int rc = 0; 258 259 /* 260 * Root hub was already suspended. Disable irq emission and 261 * mark HW unaccessible, bail out if RH has been resumed. Use 262 * the spinlock to properly synchronize with possible pending 263 * RH suspend or resume activity. 264 */ 265 spin_lock_irqsave(&ohci->lock, flags); 266 if (ohci->rh_state != OHCI_RH_SUSPENDED && 267 ohci->rh_state != OHCI_RH_HALTED) { 268 rc = -EINVAL; 269 goto fail; 270 } 271 272 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); 273 274 if (exynos_ohci->otg) 275 exynos_ohci->otg->set_host(exynos_ohci->otg, 276 &exynos_ohci->hcd->self); 277 278 exynos_ohci_phy_disable(exynos_ohci); 279 280 clk_disable_unprepare(exynos_ohci->clk); 281 282 fail: 283 spin_unlock_irqrestore(&ohci->lock, flags); 284 285 return rc; 286 } 287 288 static int exynos_ohci_resume(struct device *dev) 289 { 290 struct exynos_ohci_hcd *exynos_ohci = dev_get_drvdata(dev); 291 struct usb_hcd *hcd = exynos_ohci->hcd; 292 293 clk_prepare_enable(exynos_ohci->clk); 294 295 if (exynos_ohci->otg) 296 exynos_ohci->otg->set_host(exynos_ohci->otg, 297 &exynos_ohci->hcd->self); 298 299 exynos_ohci_phy_enable(exynos_ohci); 300 301 ohci_resume(hcd, false); 302 303 return 0; 304 } 305 #else 306 #define exynos_ohci_suspend NULL 307 #define exynos_ohci_resume NULL 308 #endif 309 310 static const struct dev_pm_ops exynos_ohci_pm_ops = { 311 .suspend = exynos_ohci_suspend, 312 .resume = exynos_ohci_resume, 313 }; 314 315 #ifdef CONFIG_OF 316 static const struct of_device_id exynos_ohci_match[] = { 317 { .compatible = "samsung,exynos4210-ohci" }, 318 { .compatible = "samsung,exynos5440-ohci" }, 319 {}, 320 }; 321 MODULE_DEVICE_TABLE(of, exynos_ohci_match); 322 #endif 323 324 static struct platform_driver exynos_ohci_driver = { 325 .probe = exynos_ohci_probe, 326 .remove = exynos_ohci_remove, 327 .shutdown = exynos_ohci_shutdown, 328 .driver = { 329 .name = "exynos-ohci", 330 .owner = THIS_MODULE, 331 .pm = &exynos_ohci_pm_ops, 332 .of_match_table = of_match_ptr(exynos_ohci_match), 333 } 334 }; 335 336 MODULE_ALIAS("platform:exynos-ohci"); 337 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>"); 338