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