drivers/usb/dwc3/dwc3-omap.c

   1 /**
   2  * dwc3-omap.c - OMAP Specific Glue layer
   3  *
   4  * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com
   5  * All rights reserved.
   6  *
   7  * Authors: Felipe Balbi <balbi@ti.com>,
   8  *          Sebastian Andrzej Siewior <bigeasy@linutronix.de>
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions, and the following disclaimer,
  15  *    without modification.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. The names of the above-listed copyright holders may not be used
  20  *    to endorse or promote products derived from this software without
  21  *    specific prior written permission.
  22  *
  23  * ALTERNATIVELY, this software may be distributed under the terms of the
  24  * GNU General Public License ("GPL") version 2, as published by the Free
  25  * Software Foundation.
  26  *
  27  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
  28  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  29  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  30  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  31  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  32  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  33  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  34  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  35  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  36  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  37  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  38  */
  39
  40 #include <linux/kernel.h>
  41 #include <linux/slab.h>
  42 #include <linux/interrupt.h>
  43 #include <linux/spinlock.h>
  44 #include <linux/platform_device.h>
  45 #include <linux/platform_data/dwc3-omap.h>
  46 #include <linux/dma-mapping.h>
  47 #include <linux/ioport.h>
  48 #include <linux/io.h>
  49
  50 #include "io.h"
  51
  52 /*
  53  * All these registers belong to OMAP's Wrapper around the
  54  * DesignWare USB3 Core.
  55  */
  56
  57 #define USBOTGSS_REVISION                       0x0000
  58 #define USBOTGSS_SYSCONFIG                      0x0010
  59 #define USBOTGSS_IRQ_EOI                        0x0020
  60 #define USBOTGSS_IRQSTATUS_RAW_0                0x0024
  61 #define USBOTGSS_IRQSTATUS_0                    0x0028
  62 #define USBOTGSS_IRQENABLE_SET_0                0x002c
  63 #define USBOTGSS_IRQENABLE_CLR_0                0x0030
  64 #define USBOTGSS_IRQSTATUS_RAW_1                0x0034
  65 #define USBOTGSS_IRQSTATUS_1                    0x0038
  66 #define USBOTGSS_IRQENABLE_SET_1                0x003c
  67 #define USBOTGSS_IRQENABLE_CLR_1                0x0040
  68 #define USBOTGSS_UTMI_OTG_CTRL                  0x0080
  69 #define USBOTGSS_UTMI_OTG_STATUS                0x0084
  70 #define USBOTGSS_MMRAM_OFFSET                   0x0100
  71 #define USBOTGSS_FLADJ                          0x0104
  72 #define USBOTGSS_DEBUG_CFG                      0x0108
  73 #define USBOTGSS_DEBUG_DATA                     0x010c
  74
  75 /* SYSCONFIG REGISTER */
  76 #define USBOTGSS_SYSCONFIG_DMADISABLE           (1 << 16)
  77 #define USBOTGSS_SYSCONFIG_STANDBYMODE(x)       ((x) << 4)
  78 #define USBOTGSS_SYSCONFIG_IDLEMODE(x)          ((x) << 2)
  79
  80 /* IRQ_EOI REGISTER */
  81 #define USBOTGSS_IRQ_EOI_LINE_NUMBER            (1 << 0)
  82
  83 /* IRQS0 BITS */
  84 #define USBOTGSS_IRQO_COREIRQ_ST                (1 << 0)
  85
  86 /* IRQ1 BITS */
  87 #define USBOTGSS_IRQ1_DMADISABLECLR             (1 << 17)
  88 #define USBOTGSS_IRQ1_OEVT                      (1 << 16)
  89 #define USBOTGSS_IRQ1_DRVVBUS_RISE              (1 << 13)
  90 #define USBOTGSS_IRQ1_CHRGVBUS_RISE             (1 << 12)
  91 #define USBOTGSS_IRQ1_DISCHRGVBUS_RISE          (1 << 11)
  92 #define USBOTGSS_IRQ1_IDPULLUP_RISE             (1 << 8)
  93 #define USBOTGSS_IRQ1_DRVVBUS_FALL              (1 << 5)
  94 #define USBOTGSS_IRQ1_CHRGVBUS_FALL             (1 << 4)
  95 #define USBOTGSS_IRQ1_DISCHRGVBUS_FALL          (1 << 3)
  96 #define USBOTGSS_IRQ1_IDPULLUP_FALL             (1 << 0)
  97
  98 /* UTMI_OTG_CTRL REGISTER */
  99 #define USBOTGSS_UTMI_OTG_CTRL_DRVVBUS          (1 << 5)
 100 #define USBOTGSS_UTMI_OTG_CTRL_CHRGVBUS         (1 << 4)
 101 #define USBOTGSS_UTMI_OTG_CTRL_DISCHRGVBUS      (1 << 3)
 102 #define USBOTGSS_UTMI_OTG_CTRL_IDPULLUP         (1 << 0)
 103
 104 /* UTMI_OTG_STATUS REGISTER */
 105 #define USBOTGSS_UTMI_OTG_STATUS_SW_MODE        (1 << 31)
 106 #define USBOTGSS_UTMI_OTG_STATUS_POWERPRESENT   (1 << 9)
 107 #define USBOTGSS_UTMI_OTG_STATUS_TXBITSTUFFENABLE (1 << 8)
 108 #define USBOTGSS_UTMI_OTG_STATUS_IDDIG          (1 << 4)
 109 #define USBOTGSS_UTMI_OTG_STATUS_SESSEND        (1 << 3)
 110 #define USBOTGSS_UTMI_OTG_STATUS_SESSVALID      (1 << 2)
 111 #define USBOTGSS_UTMI_OTG_STATUS_VBUSVALID      (1 << 1)
 112
 113 struct dwc3_omap {
 114         /* device lock */
 115         spinlock_t              lock;
 116
 117         struct platform_device  *dwc3;
 118         struct device           *dev;
 119
 120         int                     irq;
 121         void __iomem            *base;
 122
 123         void                    *context;
 124         u32                     resource_size;
 125
 126         u32                     dma_status:1;
 127 };
 128
 129 static irqreturn_t dwc3_omap_interrupt(int irq, void *_omap)
 130 {
 131         struct dwc3_omap        *omap = _omap;
 132         u32                     reg;
 133         u32                     ctrl;
 134
 135         spin_lock(&omap->lock);
 136
 137         reg = dwc3_readl(omap->base, USBOTGSS_IRQSTATUS_1);
 138         ctrl = dwc3_readl(omap->base, USBOTGSS_UTMI_OTG_CTRL);
 139
 140         if (reg & USBOTGSS_IRQ1_DMADISABLECLR) {
 141                 dev_dbg(omap->dev, "DMA Disable was Cleared\n");
 142                 omap->dma_status = false;
 143         }
 144
 145         if (reg & USBOTGSS_IRQ1_OEVT)
 146                 dev_dbg(omap->dev, "OTG Event\n");
 147
 148         if (reg & USBOTGSS_IRQ1_DRVVBUS_RISE) {
 149                 dev_dbg(omap->dev, "DRVVBUS Rise\n");
 150                 ctrl |= USBOTGSS_UTMI_OTG_CTRL_DRVVBUS;
 151         }
 152
 153         if (reg & USBOTGSS_IRQ1_CHRGVBUS_RISE) {
 154                 dev_dbg(omap->dev, "CHRGVBUS Rise\n");
 155                 ctrl |= USBOTGSS_UTMI_OTG_CTRL_CHRGVBUS;
 156         }
 157
 158         if (reg & USBOTGSS_IRQ1_DISCHRGVBUS_RISE) {
 159                 dev_dbg(omap->dev, "DISCHRGVBUS Rise\n");
 160                 ctrl |= USBOTGSS_UTMI_OTG_CTRL_DISCHRGVBUS;
 161         }
 162
 163         if (reg & USBOTGSS_IRQ1_IDPULLUP_RISE) {
 164                 dev_dbg(omap->dev, "IDPULLUP Rise\n");
 165                 ctrl |= USBOTGSS_UTMI_OTG_CTRL_IDPULLUP;
 166         }
 167
 168         if (reg & USBOTGSS_IRQ1_DRVVBUS_FALL) {
 169                 dev_dbg(omap->dev, "DRVVBUS Fall\n");
 170                 ctrl &= ~USBOTGSS_UTMI_OTG_CTRL_DRVVBUS;
 171         }
 172
 173         if (reg & USBOTGSS_IRQ1_CHRGVBUS_FALL) {
 174                 dev_dbg(omap->dev, "CHRGVBUS Fall\n");
 175                 ctrl &= ~USBOTGSS_UTMI_OTG_CTRL_CHRGVBUS;
 176         }
 177
 178         if (reg & USBOTGSS_IRQ1_DISCHRGVBUS_FALL) {
 179                 dev_dbg(omap->dev, "DISCHRGVBUS Fall\n");
 180                 ctrl &= ~USBOTGSS_UTMI_OTG_CTRL_DISCHRGVBUS;
 181         }
 182
 183         if (reg & USBOTGSS_IRQ1_IDPULLUP_FALL) {
 184                 dev_dbg(omap->dev, "IDPULLUP Fall\n");
 185                 ctrl &= ~USBOTGSS_UTMI_OTG_CTRL_IDPULLUP;
 186         }
 187
 188         dwc3_writel(omap->base, USBOTGSS_UTMI_OTG_CTRL, ctrl);
 189
 190         spin_unlock(&omap->lock);
 191
 192         return IRQ_HANDLED;
 193 }
 194
 195 static int __devinit dwc3_omap_probe(struct platform_device *pdev)
 196 {
 197         struct dwc3_omap_data   *pdata = pdev->dev.platform_data;
 198         struct platform_device  *dwc3;
 199         struct dwc3_omap        *omap;
 200         struct resource         *res;
 201
 202         int                     ret = -ENOMEM;
 203         int                     irq;
 204
 205         u32                     reg;
 206
 207         void __iomem            *base;
 208         void                    *context;
 209
 210         omap = kzalloc(sizeof(*omap), GFP_KERNEL);
 211         if (!omap) {
 212                 dev_err(&pdev->dev, "not enough memory\n");
 213                 goto err0;
 214         }
 215
 216         platform_set_drvdata(pdev, omap);
 217
 218         irq = platform_get_irq(pdev, 1);
 219         if (irq < 0) {
 220                 dev_err(&pdev->dev, "missing IRQ resource\n");
 221                 ret = -EINVAL;
 222                 goto err1;
 223         }
 224
 225         res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 226         if (!res) {
 227                 dev_err(&pdev->dev, "missing memory base resource\n");
 228                 ret = -EINVAL;
 229                 goto err1;
 230         }
 231
 232         base = ioremap_nocache(res->start, resource_size(res));
 233         if (!base) {
 234                 dev_err(&pdev->dev, "ioremap failed\n");
 235                 goto err1;
 236         }
 237
 238         dwc3 = platform_device_alloc("dwc3-omap", -1);
 239         if (!dwc3) {
 240                 dev_err(&pdev->dev, "couldn't allocate dwc3 device\n");
 241                 goto err2;
 242         }
 243
 244         context = kzalloc(resource_size(res), GFP_KERNEL);
 245         if (!context) {
 246                 dev_err(&pdev->dev, "couldn't allocate dwc3 context memory\n");
 247                 goto err3;
 248         }
 249
 250         spin_lock_init(&omap->lock);
 251         dma_set_coherent_mask(&dwc3->dev, pdev->dev.coherent_dma_mask);
 252
 253         dwc3->dev.parent = &pdev->dev;
 254         dwc3->dev.dma_mask = pdev->dev.dma_mask;
 255         dwc3->dev.dma_parms = pdev->dev.dma_parms;
 256         omap->resource_size = resource_size(res);
 257         omap->context   = context;
 258         omap->dev       = &pdev->dev;
 259         omap->irq       = irq;
 260         omap->base      = base;
 261         omap->dwc3      = dwc3;
 262
 263         reg = dwc3_readl(omap->base, USBOTGSS_UTMI_OTG_STATUS);
 264
 265         if (!pdata) {
 266                 dev_dbg(&pdev->dev, "missing platform data\n");
 267         } else {
 268                 switch (pdata->utmi_mode) {
 269                 case DWC3_OMAP_UTMI_MODE_SW:
 270                         reg |= USBOTGSS_UTMI_OTG_STATUS_SW_MODE;
 271                         break;
 272                 case DWC3_OMAP_UTMI_MODE_HW:
 273                         reg &= ~USBOTGSS_UTMI_OTG_STATUS_SW_MODE;
 274                         break;
 275                 default:
 276                         dev_dbg(&pdev->dev, "UNKNOWN utmi mode %d\n",
 277                                         pdata->utmi_mode);
 278                 }
 279         }
 280
 281         dwc3_writel(omap->base, USBOTGSS_UTMI_OTG_STATUS, reg);
 282
 283         /* check the DMA Status */
 284         reg = dwc3_readl(omap->base, USBOTGSS_SYSCONFIG);
 285         omap->dma_status = !!(reg & USBOTGSS_SYSCONFIG_DMADISABLE);
 286
 287         ret = request_irq(omap->irq, dwc3_omap_interrupt, 0,
 288                         "dwc3-wrapper", omap);
 289         if (ret) {
 290                 dev_err(&pdev->dev, "failed to request IRQ #%d --> %d\n",
 291                                 omap->irq, ret);
 292                 goto err4;
 293         }
 294
 295         /* enable all IRQs */
 296         reg = USBOTGSS_IRQO_COREIRQ_ST;
 297         dwc3_writel(omap->base, USBOTGSS_IRQENABLE_SET_0, reg);
 298
 299         reg = (USBOTGSS_IRQ1_OEVT |
 300                         USBOTGSS_IRQ1_DRVVBUS_RISE |
 301                         USBOTGSS_IRQ1_CHRGVBUS_RISE |
 302                         USBOTGSS_IRQ1_DISCHRGVBUS_RISE |
 303                         USBOTGSS_IRQ1_IDPULLUP_RISE |
 304                         USBOTGSS_IRQ1_DRVVBUS_FALL |
 305                         USBOTGSS_IRQ1_CHRGVBUS_FALL |
 306                         USBOTGSS_IRQ1_DISCHRGVBUS_FALL |
 307                         USBOTGSS_IRQ1_IDPULLUP_FALL);
 308
 309         dwc3_writel(omap->base, USBOTGSS_IRQENABLE_SET_1, reg);
 310
 311         ret = platform_device_add_resources(dwc3, pdev->resource,
 312                         pdev->num_resources);
 313         if (ret) {
 314                 dev_err(&pdev->dev, "couldn't add resources to dwc3 device\n");
 315                 goto err5;
 316         }
 317
 318         ret = platform_device_add(dwc3);
 319         if (ret) {
 320                 dev_err(&pdev->dev, "failed to register dwc3 device\n");
 321                 goto err5;
 322         }
 323
 324         return 0;
 325
 326 err5:
 327         free_irq(omap->irq, omap);
 328
 329 err4:
 330         kfree(omap->context);
 331
 332 err3:
 333         platform_device_put(dwc3);
 334
 335 err2:
 336         iounmap(base);
 337
 338 err1:
 339         kfree(omap);
 340
 341 err0:
 342         return ret;
 343 }
 344
 345 static int __devexit dwc3_omap_remove(struct platform_device *pdev)
 346 {
 347         struct dwc3_omap        *omap = platform_get_drvdata(pdev);
 348
 349         platform_device_unregister(omap->dwc3);
 350
 351         free_irq(omap->irq, omap);
 352         iounmap(omap->base);
 353
 354         kfree(omap->context);
 355         kfree(omap);
 356
 357         return 0;
 358 }
 359
 360 static const struct of_device_id of_dwc3_matach[] = {
 361         {
 362                 "ti,dwc3",
 363         },
 364         { },
 365 };
 366 MODULE_DEVICE_TABLE(of, of_dwc3_matach);
 367
 368 static struct platform_driver dwc3_omap_driver = {
 369         .probe          = dwc3_omap_probe,
 370         .remove         = __devexit_p(dwc3_omap_remove),
 371         .driver         = {
 372                 .name   = "omap-dwc3",
 373                 .of_match_table = of_dwc3_matach,
 374         },
 375 };
 376
 377 MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
 378 MODULE_LICENSE("Dual BSD/GPL");
 379 MODULE_DESCRIPTION("DesignWare USB3 OMAP Glue Layer");
 380
 381 static int __devinit dwc3_omap_init(void)
 382 {
 383         return platform_driver_register(&dwc3_omap_driver);
 384 }
 385 module_init(dwc3_omap_init);
 386
 387 static void __exit dwc3_omap_exit(void)
 388 {
 389         platform_driver_unregister(&dwc3_omap_driver);
 390 }
 391 module_exit(dwc3_omap_exit);