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-exynos.h> 18 #include <linux/usb/phy.h> 19 #include <linux/usb/samsung_usb_phy.h> 20 #include <plat/usb-phy.h> 21 22 struct exynos_ohci_hcd { 23 struct device *dev; 24 struct usb_hcd *hcd; 25 struct clk *clk; 26 struct usb_phy *phy; 27 struct usb_otg *otg; 28 struct exynos4_ohci_platdata *pdata; 29 }; 30 31 static void exynos_ohci_phy_enable(struct exynos_ohci_hcd *exynos_ohci) 32 { 33 struct platform_device *pdev = to_platform_device(exynos_ohci->dev); 34 35 if (exynos_ohci->phy) 36 usb_phy_init(exynos_ohci->phy); 37 else if (exynos_ohci->pdata->phy_init) 38 exynos_ohci->pdata->phy_init(pdev, USB_PHY_TYPE_HOST); 39 } 40 41 static void exynos_ohci_phy_disable(struct exynos_ohci_hcd *exynos_ohci) 42 { 43 struct platform_device *pdev = to_platform_device(exynos_ohci->dev); 44 45 if (exynos_ohci->phy) 46 usb_phy_shutdown(exynos_ohci->phy); 47 else if (exynos_ohci->pdata->phy_exit) 48 exynos_ohci->pdata->phy_exit(pdev, USB_PHY_TYPE_HOST); 49 } 50 51 static int ohci_exynos_reset(struct usb_hcd *hcd) 52 { 53 return ohci_init(hcd_to_ohci(hcd)); 54 } 55 56 static int ohci_exynos_start(struct usb_hcd *hcd) 57 { 58 struct ohci_hcd *ohci = hcd_to_ohci(hcd); 59 int ret; 60 61 ohci_dbg(ohci, "ohci_exynos_start, ohci:%p", ohci); 62 63 ret = ohci_run(ohci); 64 if (ret < 0) { 65 dev_err(hcd->self.controller, "can't start %s\n", 66 hcd->self.bus_name); 67 ohci_stop(hcd); 68 return ret; 69 } 70 71 return 0; 72 } 73 74 static const struct hc_driver exynos_ohci_hc_driver = { 75 .description = hcd_name, 76 .product_desc = "EXYNOS OHCI Host Controller", 77 .hcd_priv_size = sizeof(struct ohci_hcd), 78 79 .irq = ohci_irq, 80 .flags = HCD_MEMORY|HCD_USB11, 81 82 .reset = ohci_exynos_reset, 83 .start = ohci_exynos_start, 84 .stop = ohci_stop, 85 .shutdown = ohci_shutdown, 86 87 .get_frame_number = ohci_get_frame, 88 89 .urb_enqueue = ohci_urb_enqueue, 90 .urb_dequeue = ohci_urb_dequeue, 91 .endpoint_disable = ohci_endpoint_disable, 92 93 .hub_status_data = ohci_hub_status_data, 94 .hub_control = ohci_hub_control, 95 #ifdef CONFIG_PM 96 .bus_suspend = ohci_bus_suspend, 97 .bus_resume = ohci_bus_resume, 98 #endif 99 .start_port_reset = ohci_start_port_reset, 100 }; 101 102 static u64 ohci_exynos_dma_mask = DMA_BIT_MASK(32); 103 104 static int exynos_ohci_probe(struct platform_device *pdev) 105 { 106 struct exynos4_ohci_platdata *pdata = pdev->dev.platform_data; 107 struct exynos_ohci_hcd *exynos_ohci; 108 struct usb_hcd *hcd; 109 struct ohci_hcd *ohci; 110 struct resource *res; 111 struct usb_phy *phy; 112 int irq; 113 int err; 114 115 /* 116 * Right now device-tree probed devices don't get dma_mask set. 117 * Since shared usb code relies on it, set it here for now. 118 * Once we move to full device tree support this will vanish off. 119 */ 120 if (!pdev->dev.dma_mask) 121 pdev->dev.dma_mask = &ohci_exynos_dma_mask; 122 if (!pdev->dev.coherent_dma_mask) 123 pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32); 124 125 exynos_ohci = devm_kzalloc(&pdev->dev, sizeof(struct exynos_ohci_hcd), 126 GFP_KERNEL); 127 if (!exynos_ohci) 128 return -ENOMEM; 129 130 phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2); 131 if (IS_ERR_OR_NULL(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 exynos_ohci->dev = &pdev->dev; 145 146 hcd = usb_create_hcd(&exynos_ohci_hc_driver, &pdev->dev, 147 dev_name(&pdev->dev)); 148 if (!hcd) { 149 dev_err(&pdev->dev, "Unable to create HCD\n"); 150 return -ENOMEM; 151 } 152 153 exynos_ohci->hcd = hcd; 154 exynos_ohci->clk = devm_clk_get(&pdev->dev, "usbhost"); 155 156 if (IS_ERR(exynos_ohci->clk)) { 157 dev_err(&pdev->dev, "Failed to get usbhost clock\n"); 158 err = PTR_ERR(exynos_ohci->clk); 159 goto fail_clk; 160 } 161 162 err = clk_prepare_enable(exynos_ohci->clk); 163 if (err) 164 goto fail_clk; 165 166 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 167 if (!res) { 168 dev_err(&pdev->dev, "Failed to get I/O memory\n"); 169 err = -ENXIO; 170 goto fail_io; 171 } 172 173 hcd->rsrc_start = res->start; 174 hcd->rsrc_len = resource_size(res); 175 hcd->regs = devm_ioremap(&pdev->dev, res->start, hcd->rsrc_len); 176 if (!hcd->regs) { 177 dev_err(&pdev->dev, "Failed to remap I/O memory\n"); 178 err = -ENOMEM; 179 goto fail_io; 180 } 181 182 irq = platform_get_irq(pdev, 0); 183 if (!irq) { 184 dev_err(&pdev->dev, "Failed to get IRQ\n"); 185 err = -ENODEV; 186 goto fail_io; 187 } 188 189 if (exynos_ohci->otg) 190 exynos_ohci->otg->set_host(exynos_ohci->otg, 191 &exynos_ohci->hcd->self); 192 193 exynos_ohci_phy_enable(exynos_ohci); 194 195 ohci = hcd_to_ohci(hcd); 196 ohci_hcd_init(ohci); 197 198 err = usb_add_hcd(hcd, irq, IRQF_SHARED); 199 if (err) { 200 dev_err(&pdev->dev, "Failed to add USB HCD\n"); 201 goto fail_add_hcd; 202 } 203 204 platform_set_drvdata(pdev, exynos_ohci); 205 206 return 0; 207 208 fail_add_hcd: 209 exynos_ohci_phy_disable(exynos_ohci); 210 fail_io: 211 clk_disable_unprepare(exynos_ohci->clk); 212 fail_clk: 213 usb_put_hcd(hcd); 214 return err; 215 } 216 217 static int exynos_ohci_remove(struct platform_device *pdev) 218 { 219 struct exynos_ohci_hcd *exynos_ohci = platform_get_drvdata(pdev); 220 struct usb_hcd *hcd = exynos_ohci->hcd; 221 222 usb_remove_hcd(hcd); 223 224 if (exynos_ohci->otg) 225 exynos_ohci->otg->set_host(exynos_ohci->otg, 226 &exynos_ohci->hcd->self); 227 228 exynos_ohci_phy_disable(exynos_ohci); 229 230 clk_disable_unprepare(exynos_ohci->clk); 231 232 usb_put_hcd(hcd); 233 234 return 0; 235 } 236 237 static void exynos_ohci_shutdown(struct platform_device *pdev) 238 { 239 struct exynos_ohci_hcd *exynos_ohci = platform_get_drvdata(pdev); 240 struct usb_hcd *hcd = exynos_ohci->hcd; 241 242 if (hcd->driver->shutdown) 243 hcd->driver->shutdown(hcd); 244 } 245 246 #ifdef CONFIG_PM 247 static int exynos_ohci_suspend(struct device *dev) 248 { 249 struct exynos_ohci_hcd *exynos_ohci = dev_get_drvdata(dev); 250 struct usb_hcd *hcd = exynos_ohci->hcd; 251 struct ohci_hcd *ohci = hcd_to_ohci(hcd); 252 unsigned long flags; 253 int rc = 0; 254 255 /* 256 * Root hub was already suspended. Disable irq emission and 257 * mark HW unaccessible, bail out if RH has been resumed. Use 258 * the spinlock to properly synchronize with possible pending 259 * RH suspend or resume activity. 260 */ 261 spin_lock_irqsave(&ohci->lock, flags); 262 if (ohci->rh_state != OHCI_RH_SUSPENDED && 263 ohci->rh_state != OHCI_RH_HALTED) { 264 rc = -EINVAL; 265 goto fail; 266 } 267 268 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); 269 270 if (exynos_ohci->otg) 271 exynos_ohci->otg->set_host(exynos_ohci->otg, 272 &exynos_ohci->hcd->self); 273 274 exynos_ohci_phy_disable(exynos_ohci); 275 276 clk_disable_unprepare(exynos_ohci->clk); 277 278 fail: 279 spin_unlock_irqrestore(&ohci->lock, flags); 280 281 return rc; 282 } 283 284 static int exynos_ohci_resume(struct device *dev) 285 { 286 struct exynos_ohci_hcd *exynos_ohci = dev_get_drvdata(dev); 287 struct usb_hcd *hcd = exynos_ohci->hcd; 288 289 clk_prepare_enable(exynos_ohci->clk); 290 291 if (exynos_ohci->otg) 292 exynos_ohci->otg->set_host(exynos_ohci->otg, 293 &exynos_ohci->hcd->self); 294 295 exynos_ohci_phy_enable(exynos_ohci); 296 297 ohci_resume(hcd, false); 298 299 return 0; 300 } 301 #else 302 #define exynos_ohci_suspend NULL 303 #define exynos_ohci_resume NULL 304 #endif 305 306 static const struct dev_pm_ops exynos_ohci_pm_ops = { 307 .suspend = exynos_ohci_suspend, 308 .resume = exynos_ohci_resume, 309 }; 310 311 #ifdef CONFIG_OF 312 static const struct of_device_id exynos_ohci_match[] = { 313 { .compatible = "samsung,exynos4210-ohci" }, 314 {}, 315 }; 316 MODULE_DEVICE_TABLE(of, exynos_ohci_match); 317 #endif 318 319 static struct platform_driver exynos_ohci_driver = { 320 .probe = exynos_ohci_probe, 321 .remove = exynos_ohci_remove, 322 .shutdown = exynos_ohci_shutdown, 323 .driver = { 324 .name = "exynos-ohci", 325 .owner = THIS_MODULE, 326 .pm = &exynos_ohci_pm_ops, 327 .of_match_table = of_match_ptr(exynos_ohci_match), 328 } 329 }; 330 331 MODULE_ALIAS("platform:exynos-ohci"); 332 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>"); 333