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 u64 ohci_exynos_dma_mask = DMA_BIT_MASK(32); 102 103 static int exynos_ohci_probe(struct platform_device *pdev) 104 { 105 struct exynos4_ohci_platdata *pdata = pdev->dev.platform_data; 106 struct exynos_ohci_hcd *exynos_ohci; 107 struct usb_hcd *hcd; 108 struct ohci_hcd *ohci; 109 struct resource *res; 110 struct usb_phy *phy; 111 int irq; 112 int err; 113 114 /* 115 * Right now device-tree probed devices don't get dma_mask set. 116 * Since shared usb code relies on it, set it here for now. 117 * Once we move to full device tree support this will vanish off. 118 */ 119 if (!pdev->dev.dma_mask) 120 pdev->dev.dma_mask = &ohci_exynos_dma_mask; 121 if (!pdev->dev.coherent_dma_mask) 122 pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32); 123 124 exynos_ohci = devm_kzalloc(&pdev->dev, sizeof(struct exynos_ohci_hcd), 125 GFP_KERNEL); 126 if (!exynos_ohci) 127 return -ENOMEM; 128 129 if (of_device_is_compatible(pdev->dev.of_node, 130 "samsung,exynos5440-ohci")) 131 goto skip_phy; 132 133 phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2); 134 if (IS_ERR(phy)) { 135 /* Fallback to pdata */ 136 if (!pdata) { 137 dev_warn(&pdev->dev, "no platform data or transceiver defined\n"); 138 return -EPROBE_DEFER; 139 } else { 140 exynos_ohci->pdata = pdata; 141 } 142 } else { 143 exynos_ohci->phy = phy; 144 exynos_ohci->otg = phy->otg; 145 } 146 147 skip_phy: 148 149 exynos_ohci->dev = &pdev->dev; 150 151 hcd = usb_create_hcd(&exynos_ohci_hc_driver, &pdev->dev, 152 dev_name(&pdev->dev)); 153 if (!hcd) { 154 dev_err(&pdev->dev, "Unable to create HCD\n"); 155 return -ENOMEM; 156 } 157 158 exynos_ohci->hcd = hcd; 159 exynos_ohci->clk = devm_clk_get(&pdev->dev, "usbhost"); 160 161 if (IS_ERR(exynos_ohci->clk)) { 162 dev_err(&pdev->dev, "Failed to get usbhost clock\n"); 163 err = PTR_ERR(exynos_ohci->clk); 164 goto fail_clk; 165 } 166 167 err = clk_prepare_enable(exynos_ohci->clk); 168 if (err) 169 goto fail_clk; 170 171 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 172 if (!res) { 173 dev_err(&pdev->dev, "Failed to get I/O memory\n"); 174 err = -ENXIO; 175 goto fail_io; 176 } 177 178 hcd->rsrc_start = res->start; 179 hcd->rsrc_len = resource_size(res); 180 hcd->regs = devm_ioremap(&pdev->dev, res->start, hcd->rsrc_len); 181 if (!hcd->regs) { 182 dev_err(&pdev->dev, "Failed to remap I/O memory\n"); 183 err = -ENOMEM; 184 goto fail_io; 185 } 186 187 irq = platform_get_irq(pdev, 0); 188 if (!irq) { 189 dev_err(&pdev->dev, "Failed to get IRQ\n"); 190 err = -ENODEV; 191 goto fail_io; 192 } 193 194 if (exynos_ohci->otg) 195 exynos_ohci->otg->set_host(exynos_ohci->otg, 196 &exynos_ohci->hcd->self); 197 198 exynos_ohci_phy_enable(exynos_ohci); 199 200 ohci = hcd_to_ohci(hcd); 201 ohci_hcd_init(ohci); 202 203 err = usb_add_hcd(hcd, irq, IRQF_SHARED); 204 if (err) { 205 dev_err(&pdev->dev, "Failed to add USB HCD\n"); 206 goto fail_add_hcd; 207 } 208 209 platform_set_drvdata(pdev, exynos_ohci); 210 211 return 0; 212 213 fail_add_hcd: 214 exynos_ohci_phy_disable(exynos_ohci); 215 fail_io: 216 clk_disable_unprepare(exynos_ohci->clk); 217 fail_clk: 218 usb_put_hcd(hcd); 219 return err; 220 } 221 222 static int exynos_ohci_remove(struct platform_device *pdev) 223 { 224 struct exynos_ohci_hcd *exynos_ohci = platform_get_drvdata(pdev); 225 struct usb_hcd *hcd = exynos_ohci->hcd; 226 227 usb_remove_hcd(hcd); 228 229 if (exynos_ohci->otg) 230 exynos_ohci->otg->set_host(exynos_ohci->otg, 231 &exynos_ohci->hcd->self); 232 233 exynos_ohci_phy_disable(exynos_ohci); 234 235 clk_disable_unprepare(exynos_ohci->clk); 236 237 usb_put_hcd(hcd); 238 239 return 0; 240 } 241 242 static void exynos_ohci_shutdown(struct platform_device *pdev) 243 { 244 struct exynos_ohci_hcd *exynos_ohci = platform_get_drvdata(pdev); 245 struct usb_hcd *hcd = exynos_ohci->hcd; 246 247 if (hcd->driver->shutdown) 248 hcd->driver->shutdown(hcd); 249 } 250 251 #ifdef CONFIG_PM 252 static int exynos_ohci_suspend(struct device *dev) 253 { 254 struct exynos_ohci_hcd *exynos_ohci = dev_get_drvdata(dev); 255 struct usb_hcd *hcd = exynos_ohci->hcd; 256 struct ohci_hcd *ohci = hcd_to_ohci(hcd); 257 unsigned long flags; 258 int rc = 0; 259 260 /* 261 * Root hub was already suspended. Disable irq emission and 262 * mark HW unaccessible, bail out if RH has been resumed. Use 263 * the spinlock to properly synchronize with possible pending 264 * RH suspend or resume activity. 265 */ 266 spin_lock_irqsave(&ohci->lock, flags); 267 if (ohci->rh_state != OHCI_RH_SUSPENDED && 268 ohci->rh_state != OHCI_RH_HALTED) { 269 rc = -EINVAL; 270 goto fail; 271 } 272 273 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); 274 275 if (exynos_ohci->otg) 276 exynos_ohci->otg->set_host(exynos_ohci->otg, 277 &exynos_ohci->hcd->self); 278 279 exynos_ohci_phy_disable(exynos_ohci); 280 281 clk_disable_unprepare(exynos_ohci->clk); 282 283 fail: 284 spin_unlock_irqrestore(&ohci->lock, flags); 285 286 return rc; 287 } 288 289 static int exynos_ohci_resume(struct device *dev) 290 { 291 struct exynos_ohci_hcd *exynos_ohci = dev_get_drvdata(dev); 292 struct usb_hcd *hcd = exynos_ohci->hcd; 293 294 clk_prepare_enable(exynos_ohci->clk); 295 296 if (exynos_ohci->otg) 297 exynos_ohci->otg->set_host(exynos_ohci->otg, 298 &exynos_ohci->hcd->self); 299 300 exynos_ohci_phy_enable(exynos_ohci); 301 302 ohci_resume(hcd, false); 303 304 return 0; 305 } 306 #else 307 #define exynos_ohci_suspend NULL 308 #define exynos_ohci_resume NULL 309 #endif 310 311 static const struct dev_pm_ops exynos_ohci_pm_ops = { 312 .suspend = exynos_ohci_suspend, 313 .resume = exynos_ohci_resume, 314 }; 315 316 #ifdef CONFIG_OF 317 static const struct of_device_id exynos_ohci_match[] = { 318 { .compatible = "samsung,exynos4210-ohci" }, 319 { .compatible = "samsung,exynos5440-ohci" }, 320 {}, 321 }; 322 MODULE_DEVICE_TABLE(of, exynos_ohci_match); 323 #endif 324 325 static struct platform_driver exynos_ohci_driver = { 326 .probe = exynos_ohci_probe, 327 .remove = exynos_ohci_remove, 328 .shutdown = exynos_ohci_shutdown, 329 .driver = { 330 .name = "exynos-ohci", 331 .owner = THIS_MODULE, 332 .pm = &exynos_ohci_pm_ops, 333 .of_match_table = of_match_ptr(exynos_ohci_match), 334 } 335 }; 336 337 MODULE_ALIAS("platform:exynos-ohci"); 338 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>"); 339