drivers/usb/renesas_usbhs/common.c

   1 /*
   2  * Renesas USB driver
   3  *
   4  * Copyright (C) 2011 Renesas Solutions Corp.
   5  * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  *
  12  * You should have received a copy of the GNU General Public License
  13  * along with this program; if not, write to the Free Software
  14  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  15  *
  16  */
  17 #include <linux/io.h>
  18 #include <linux/module.h>
  19 #include <linux/pm_runtime.h>
  20 #include <linux/slab.h>
  21 #include <linux/sysfs.h>
  22 #include "./common.h"
  23
  24 /*
  25  *              image of renesas_usbhs
  26  *
  27  * ex) gadget case
  28
  29  * mod.c
  30  * mod_gadget.c
  31  * mod_host.c           pipe.c          fifo.c
  32  *
  33  *                      +-------+       +-----------+
  34  *                      | pipe0 |------>| fifo pio  |
  35  * +------------+       +-------+       +-----------+
  36  * | mod_gadget |=====> | pipe1 |--+
  37  * +------------+       +-------+  |    +-----------+
  38  *                      | pipe2 |  |  +-| fifo dma0 |
  39  * +------------+       +-------+  |  | +-----------+
  40  * | mod_host   |       | pipe3 |<-|--+
  41  * +------------+       +-------+  |    +-----------+
  42  *                      | ....  |  +--->| fifo dma1 |
  43  *                      | ....  |       +-----------+
  44  */
  45
  46
  47 #define USBHSF_RUNTIME_PWCTRL   (1 << 0)
  48
  49 /* status */
  50 #define usbhsc_flags_init(p)   do {(p)->flags = 0; } while (0)
  51 #define usbhsc_flags_set(p, b) ((p)->flags |=  (b))
  52 #define usbhsc_flags_clr(p, b) ((p)->flags &= ~(b))
  53 #define usbhsc_flags_has(p, b) ((p)->flags &   (b))
  54
  55 /*
  56  * platform call back
  57  *
  58  * renesas usb support platform callback function.
  59  * Below macro call it.
  60  * if platform doesn't have callback, it return 0 (no error)
  61  */
  62 #define usbhs_platform_call(priv, func, args...)\
  63         (!(priv) ? -ENODEV :                    \
  64          !((priv)->pfunc.func) ? 0 :            \
  65          (priv)->pfunc.func(args))
  66
  67 /*
  68  *              common functions
  69  */
  70 u16 usbhs_read(struct usbhs_priv *priv, u32 reg)
  71 {
  72         return ioread16(priv->base + reg);
  73 }
  74
  75 void usbhs_write(struct usbhs_priv *priv, u32 reg, u16 data)
  76 {
  77         iowrite16(data, priv->base + reg);
  78 }
  79
  80 void usbhs_bset(struct usbhs_priv *priv, u32 reg, u16 mask, u16 data)
  81 {
  82         u16 val = usbhs_read(priv, reg);
  83
  84         val &= ~mask;
  85         val |= data & mask;
  86
  87         usbhs_write(priv, reg, val);
  88 }
  89
  90 struct usbhs_priv *usbhs_pdev_to_priv(struct platform_device *pdev)
  91 {
  92         return dev_get_drvdata(&pdev->dev);
  93 }
  94
  95 /*
  96  *              syscfg functions
  97  */
  98 static void usbhs_sys_clock_ctrl(struct usbhs_priv *priv, int enable)
  99 {
 100         usbhs_bset(priv, SYSCFG, SCKE, enable ? SCKE : 0);
 101 }
 102
 103 void usbhs_sys_host_ctrl(struct usbhs_priv *priv, int enable)
 104 {
 105         u16 mask = DCFM | DRPD | DPRPU | HSE | USBE;
 106         u16 val  = DCFM | DRPD | HSE | USBE;
 107         int has_otg = usbhs_get_dparam(priv, has_otg);
 108
 109         if (has_otg)
 110                 usbhs_bset(priv, DVSTCTR, (EXTLP | PWEN), (EXTLP | PWEN));
 111
 112         /*
 113          * if enable
 114          *
 115          * - select Host mode
 116          * - D+ Line/D- Line Pull-down
 117          */
 118         usbhs_bset(priv, SYSCFG, mask, enable ? val : 0);
 119 }
 120
 121 void usbhs_sys_function_ctrl(struct usbhs_priv *priv, int enable)
 122 {
 123         u16 mask = DCFM | DRPD | DPRPU | HSE | USBE;
 124         u16 val  = DPRPU | HSE | USBE;
 125
 126         /*
 127          * if enable
 128          *
 129          * - select Function mode
 130          * - D+ Line Pull-up
 131          */
 132         usbhs_bset(priv, SYSCFG, mask, enable ? val : 0);
 133 }
 134
 135 void usbhs_sys_set_test_mode(struct usbhs_priv *priv, u16 mode)
 136 {
 137         usbhs_write(priv, TESTMODE, mode);
 138 }
 139
 140 /*
 141  *              frame functions
 142  */
 143 int usbhs_frame_get_num(struct usbhs_priv *priv)
 144 {
 145         return usbhs_read(priv, FRMNUM) & FRNM_MASK;
 146 }
 147
 148 /*
 149  *              usb request functions
 150  */
 151 void usbhs_usbreq_get_val(struct usbhs_priv *priv, struct usb_ctrlrequest *req)
 152 {
 153         u16 val;
 154
 155         val = usbhs_read(priv, USBREQ);
 156         req->bRequest           = (val >> 8) & 0xFF;
 157         req->bRequestType       = (val >> 0) & 0xFF;
 158
 159         req->wValue     = usbhs_read(priv, USBVAL);
 160         req->wIndex     = usbhs_read(priv, USBINDX);
 161         req->wLength    = usbhs_read(priv, USBLENG);
 162 }
 163
 164 void usbhs_usbreq_set_val(struct usbhs_priv *priv, struct usb_ctrlrequest *req)
 165 {
 166         usbhs_write(priv, USBREQ,  (req->bRequest << 8) | req->bRequestType);
 167         usbhs_write(priv, USBVAL,  req->wValue);
 168         usbhs_write(priv, USBINDX, req->wIndex);
 169         usbhs_write(priv, USBLENG, req->wLength);
 170
 171         usbhs_bset(priv, DCPCTR, SUREQ, SUREQ);
 172 }
 173
 174 /*
 175  *              bus/vbus functions
 176  */
 177 void usbhs_bus_send_sof_enable(struct usbhs_priv *priv)
 178 {
 179         u16 status = usbhs_read(priv, DVSTCTR) & (USBRST | UACT);
 180
 181         if (status != USBRST) {
 182                 struct device *dev = usbhs_priv_to_dev(priv);
 183                 dev_err(dev, "usbhs should be reset\n");
 184         }
 185
 186         usbhs_bset(priv, DVSTCTR, (USBRST | UACT), UACT);
 187 }
 188
 189 void usbhs_bus_send_reset(struct usbhs_priv *priv)
 190 {
 191         usbhs_bset(priv, DVSTCTR, (USBRST | UACT), USBRST);
 192 }
 193
 194 int usbhs_bus_get_speed(struct usbhs_priv *priv)
 195 {
 196         u16 dvstctr = usbhs_read(priv, DVSTCTR);
 197
 198         switch (RHST & dvstctr) {
 199         case RHST_LOW_SPEED:
 200                 return USB_SPEED_LOW;
 201         case RHST_FULL_SPEED:
 202                 return USB_SPEED_FULL;
 203         case RHST_HIGH_SPEED:
 204                 return USB_SPEED_HIGH;
 205         }
 206
 207         return USB_SPEED_UNKNOWN;
 208 }
 209
 210 int usbhs_vbus_ctrl(struct usbhs_priv *priv, int enable)
 211 {
 212         struct platform_device *pdev = usbhs_priv_to_pdev(priv);
 213
 214         return usbhs_platform_call(priv, set_vbus, pdev, enable);
 215 }
 216
 217 static void usbhsc_bus_init(struct usbhs_priv *priv)
 218 {
 219         usbhs_write(priv, DVSTCTR, 0);
 220
 221         usbhs_vbus_ctrl(priv, 0);
 222 }
 223
 224 /*
 225  *              device configuration
 226  */
 227 int usbhs_set_device_config(struct usbhs_priv *priv, int devnum,
 228                            u16 upphub, u16 hubport, u16 speed)
 229 {
 230         struct device *dev = usbhs_priv_to_dev(priv);
 231         u16 usbspd = 0;
 232         u32 reg = DEVADD0 + (2 * devnum);
 233
 234         if (devnum > 10) {
 235                 dev_err(dev, "cannot set speed to unknown device %d\n", devnum);
 236                 return -EIO;
 237         }
 238
 239         if (upphub > 0xA) {
 240                 dev_err(dev, "unsupported hub number %d\n", upphub);
 241                 return -EIO;
 242         }
 243
 244         switch (speed) {
 245         case USB_SPEED_LOW:
 246                 usbspd = USBSPD_SPEED_LOW;
 247                 break;
 248         case USB_SPEED_FULL:
 249                 usbspd = USBSPD_SPEED_FULL;
 250                 break;
 251         case USB_SPEED_HIGH:
 252                 usbspd = USBSPD_SPEED_HIGH;
 253                 break;
 254         default:
 255                 dev_err(dev, "unsupported speed %d\n", speed);
 256                 return -EIO;
 257         }
 258
 259         usbhs_write(priv, reg,  UPPHUB(upphub)  |
 260                                 HUBPORT(hubport)|
 261                                 USBSPD(usbspd));
 262
 263         return 0;
 264 }
 265
 266 /*
 267  *              local functions
 268  */
 269 static void usbhsc_set_buswait(struct usbhs_priv *priv)
 270 {
 271         int wait = usbhs_get_dparam(priv, buswait_bwait);
 272
 273         /* set bus wait if platform have */
 274         if (wait)
 275                 usbhs_bset(priv, BUSWAIT, 0x000F, wait);
 276 }
 277
 278 /*
 279  *              platform default param
 280  */
 281 static u32 usbhsc_default_pipe_type[] = {
 282                 USB_ENDPOINT_XFER_CONTROL,
 283                 USB_ENDPOINT_XFER_ISOC,
 284                 USB_ENDPOINT_XFER_ISOC,
 285                 USB_ENDPOINT_XFER_BULK,
 286                 USB_ENDPOINT_XFER_BULK,
 287                 USB_ENDPOINT_XFER_BULK,
 288                 USB_ENDPOINT_XFER_INT,
 289                 USB_ENDPOINT_XFER_INT,
 290                 USB_ENDPOINT_XFER_INT,
 291                 USB_ENDPOINT_XFER_INT,
 292 };
 293
 294 /*
 295  *              power control
 296  */
 297 static void usbhsc_power_ctrl(struct usbhs_priv *priv, int enable)
 298 {
 299         struct platform_device *pdev = usbhs_priv_to_pdev(priv);
 300         struct device *dev = usbhs_priv_to_dev(priv);
 301
 302         if (enable) {
 303                 /* enable PM */
 304                 pm_runtime_get_sync(dev);
 305
 306                 /* enable platform power */
 307                 usbhs_platform_call(priv, power_ctrl, pdev, priv->base, enable);
 308
 309                 /* USB on */
 310                 usbhs_sys_clock_ctrl(priv, enable);
 311         } else {
 312                 /* USB off */
 313                 usbhs_sys_clock_ctrl(priv, enable);
 314
 315                 /* disable platform power */
 316                 usbhs_platform_call(priv, power_ctrl, pdev, priv->base, enable);
 317
 318                 /* disable PM */
 319                 pm_runtime_put_sync(dev);
 320         }
 321 }
 322
 323 /*
 324  *              hotplug
 325  */
 326 static void usbhsc_hotplug(struct usbhs_priv *priv)
 327 {
 328         struct platform_device *pdev = usbhs_priv_to_pdev(priv);
 329         struct usbhs_mod *mod = usbhs_mod_get_current(priv);
 330         int id;
 331         int enable;
 332         int ret;
 333
 334         /*
 335          * get vbus status from platform
 336          */
 337         enable = usbhs_platform_call(priv, get_vbus, pdev);
 338
 339         /*
 340          * get id from platform
 341          */
 342         id = usbhs_platform_call(priv, get_id, pdev);
 343
 344         if (enable && !mod) {
 345                 ret = usbhs_mod_change(priv, id);
 346                 if (ret < 0)
 347                         return;
 348
 349                 dev_dbg(&pdev->dev, "%s enable\n", __func__);
 350
 351                 /* power on */
 352                 if (usbhsc_flags_has(priv, USBHSF_RUNTIME_PWCTRL))
 353                         usbhsc_power_ctrl(priv, enable);
 354
 355                 /* bus init */
 356                 usbhsc_set_buswait(priv);
 357                 usbhsc_bus_init(priv);
 358
 359                 /* module start */
 360                 usbhs_mod_call(priv, start, priv);
 361
 362         } else if (!enable && mod) {
 363                 dev_dbg(&pdev->dev, "%s disable\n", __func__);
 364
 365                 /* module stop */
 366                 usbhs_mod_call(priv, stop, priv);
 367
 368                 /* bus init */
 369                 usbhsc_bus_init(priv);
 370
 371                 /* power off */
 372                 if (usbhsc_flags_has(priv, USBHSF_RUNTIME_PWCTRL))
 373                         usbhsc_power_ctrl(priv, enable);
 374
 375                 usbhs_mod_change(priv, -1);
 376
 377                 /* reset phy for next connection */
 378                 usbhs_platform_call(priv, phy_reset, pdev);
 379         }
 380 }
 381
 382 /*
 383  *              notify hotplug
 384  */
 385 static void usbhsc_notify_hotplug(struct work_struct *work)
 386 {
 387         struct usbhs_priv *priv = container_of(work,
 388                                                struct usbhs_priv,
 389                                                notify_hotplug_work.work);
 390         usbhsc_hotplug(priv);
 391 }
 392
 393 static int usbhsc_drvcllbck_notify_hotplug(struct platform_device *pdev)
 394 {
 395         struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
 396         int delay = usbhs_get_dparam(priv, detection_delay);
 397
 398         /*
 399          * This functions will be called in interrupt.
 400          * To make sure safety context,
 401          * use workqueue for usbhs_notify_hotplug
 402          */
 403         schedule_delayed_work(&priv->notify_hotplug_work,
 404                               msecs_to_jiffies(delay));
 405         return 0;
 406 }
 407
 408 /*
 409  *              platform functions
 410  */
 411 static int usbhs_probe(struct platform_device *pdev)
 412 {
 413         struct renesas_usbhs_platform_info *info = pdev->dev.platform_data;
 414         struct renesas_usbhs_driver_callback *dfunc;
 415         struct usbhs_priv *priv;
 416         struct resource *res, *irq_res;
 417         int ret;
 418
 419         /* check platform information */
 420         if (!info ||
 421             !info->platform_callback.get_id) {
 422                 dev_err(&pdev->dev, "no platform information\n");
 423                 return -EINVAL;
 424         }
 425
 426         /* platform data */
 427         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 428         irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 429         if (!res || !irq_res) {
 430                 dev_err(&pdev->dev, "Not enough Renesas USB platform resources.\n");
 431                 return -ENODEV;
 432         }
 433
 434         /* usb private data */
 435         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 436         if (!priv) {
 437                 dev_err(&pdev->dev, "Could not allocate priv\n");
 438                 return -ENOMEM;
 439         }
 440
 441         priv->base = ioremap_nocache(res->start, resource_size(res));
 442         if (!priv->base) {
 443                 dev_err(&pdev->dev, "ioremap error.\n");
 444                 ret = -ENOMEM;
 445                 goto probe_end_kfree;
 446         }
 447
 448         /*
 449          * care platform info
 450          */
 451         memcpy(&priv->pfunc,
 452                &info->platform_callback,
 453                sizeof(struct renesas_usbhs_platform_callback));
 454         memcpy(&priv->dparam,
 455                &info->driver_param,
 456                sizeof(struct renesas_usbhs_driver_param));
 457
 458         /* set driver callback functions for platform */
 459         dfunc                   = &info->driver_callback;
 460         dfunc->notify_hotplug   = usbhsc_drvcllbck_notify_hotplug;
 461
 462         /* set default param if platform doesn't have */
 463         if (!priv->dparam.pipe_type) {
 464                 priv->dparam.pipe_type = usbhsc_default_pipe_type;
 465                 priv->dparam.pipe_size = ARRAY_SIZE(usbhsc_default_pipe_type);
 466         }
 467         if (!priv->dparam.pio_dma_border)
 468                 priv->dparam.pio_dma_border = 64; /* 64byte */
 469
 470         /* FIXME */
 471         /* runtime power control ? */
 472         if (priv->pfunc.get_vbus)
 473                 usbhsc_flags_set(priv, USBHSF_RUNTIME_PWCTRL);
 474
 475         /*
 476          * priv settings
 477          */
 478         priv->irq       = irq_res->start;
 479         if (irq_res->flags & IORESOURCE_IRQ_SHAREABLE)
 480                 priv->irqflags = IRQF_SHARED;
 481         priv->pdev      = pdev;
 482         INIT_DELAYED_WORK(&priv->notify_hotplug_work, usbhsc_notify_hotplug);
 483         spin_lock_init(usbhs_priv_to_lock(priv));
 484
 485         /* call pipe and module init */
 486         ret = usbhs_pipe_probe(priv);
 487         if (ret < 0)
 488                 goto probe_end_iounmap;
 489
 490         ret = usbhs_fifo_probe(priv);
 491         if (ret < 0)
 492                 goto probe_end_pipe_exit;
 493
 494         ret = usbhs_mod_probe(priv);
 495         if (ret < 0)
 496                 goto probe_end_fifo_exit;
 497
 498         /* dev_set_drvdata should be called after usbhs_mod_init */
 499         dev_set_drvdata(&pdev->dev, priv);
 500
 501         /*
 502          * deviece reset here because
 503          * USB device might be used in boot loader.
 504          */
 505         usbhs_sys_clock_ctrl(priv, 0);
 506
 507         /*
 508          * platform call
 509          *
 510          * USB phy setup might depend on CPU/Board.
 511          * If platform has its callback functions,
 512          * call it here.
 513          */
 514         ret = usbhs_platform_call(priv, hardware_init, pdev);
 515         if (ret < 0) {
 516                 dev_err(&pdev->dev, "platform prove failed.\n");
 517                 goto probe_end_mod_exit;
 518         }
 519
 520         /* reset phy for connection */
 521         usbhs_platform_call(priv, phy_reset, pdev);
 522
 523         /* power control */
 524         pm_runtime_enable(&pdev->dev);
 525         if (!usbhsc_flags_has(priv, USBHSF_RUNTIME_PWCTRL)) {
 526                 usbhsc_power_ctrl(priv, 1);
 527                 usbhs_mod_autonomy_mode(priv);
 528         }
 529
 530         /*
 531          * manual call notify_hotplug for cold plug
 532          */
 533         ret = usbhsc_drvcllbck_notify_hotplug(pdev);
 534         if (ret < 0)
 535                 goto probe_end_call_remove;
 536
 537         dev_info(&pdev->dev, "probed\n");
 538
 539         return ret;
 540
 541 probe_end_call_remove:
 542         usbhs_platform_call(priv, hardware_exit, pdev);
 543 probe_end_mod_exit:
 544         usbhs_mod_remove(priv);
 545 probe_end_fifo_exit:
 546         usbhs_fifo_remove(priv);
 547 probe_end_pipe_exit:
 548         usbhs_pipe_remove(priv);
 549 probe_end_iounmap:
 550         iounmap(priv->base);
 551 probe_end_kfree:
 552         kfree(priv);
 553
 554         dev_info(&pdev->dev, "probe failed\n");
 555
 556         return ret;
 557 }
 558
 559 static int __devexit usbhs_remove(struct platform_device *pdev)
 560 {
 561         struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
 562         struct renesas_usbhs_platform_info *info = pdev->dev.platform_data;
 563         struct renesas_usbhs_driver_callback *dfunc = &info->driver_callback;
 564
 565         dev_dbg(&pdev->dev, "usb remove\n");
 566
 567         dfunc->notify_hotplug = NULL;
 568
 569         /* power off */
 570         if (!usbhsc_flags_has(priv, USBHSF_RUNTIME_PWCTRL))
 571                 usbhsc_power_ctrl(priv, 0);
 572
 573         pm_runtime_disable(&pdev->dev);
 574
 575         usbhs_platform_call(priv, hardware_exit, pdev);
 576         usbhs_mod_remove(priv);
 577         usbhs_fifo_remove(priv);
 578         usbhs_pipe_remove(priv);
 579         iounmap(priv->base);
 580         kfree(priv);
 581
 582         return 0;
 583 }
 584
 585 static int usbhsc_suspend(struct device *dev)
 586 {
 587         struct usbhs_priv *priv = dev_get_drvdata(dev);
 588         struct usbhs_mod *mod = usbhs_mod_get_current(priv);
 589
 590         if (mod) {
 591                 usbhs_mod_call(priv, stop, priv);
 592                 usbhs_mod_change(priv, -1);
 593         }
 594
 595         if (mod || !usbhsc_flags_has(priv, USBHSF_RUNTIME_PWCTRL))
 596                 usbhsc_power_ctrl(priv, 0);
 597
 598         return 0;
 599 }
 600
 601 static int usbhsc_resume(struct device *dev)
 602 {
 603         struct usbhs_priv *priv = dev_get_drvdata(dev);
 604         struct platform_device *pdev = usbhs_priv_to_pdev(priv);
 605
 606         usbhs_platform_call(priv, phy_reset, pdev);
 607
 608         if (!usbhsc_flags_has(priv, USBHSF_RUNTIME_PWCTRL))
 609                 usbhsc_power_ctrl(priv, 1);
 610
 611         usbhsc_hotplug(priv);
 612
 613         return 0;
 614 }
 615
 616 static int usbhsc_runtime_nop(struct device *dev)
 617 {
 618         /* Runtime PM callback shared between ->runtime_suspend()
 619          * and ->runtime_resume(). Simply returns success.
 620          *
 621          * This driver re-initializes all registers after
 622          * pm_runtime_get_sync() anyway so there is no need
 623          * to save and restore registers here.
 624          */
 625         return 0;
 626 }
 627
 628 static const struct dev_pm_ops usbhsc_pm_ops = {
 629         .suspend                = usbhsc_suspend,
 630         .resume                 = usbhsc_resume,
 631         .runtime_suspend        = usbhsc_runtime_nop,
 632         .runtime_resume         = usbhsc_runtime_nop,
 633 };
 634
 635 static struct platform_driver renesas_usbhs_driver = {
 636         .driver         = {
 637                 .name   = "renesas_usbhs",
 638                 .pm     = &usbhsc_pm_ops,
 639         },
 640         .probe          = usbhs_probe,
 641         .remove         = __devexit_p(usbhs_remove),
 642 };
 643
 644 module_platform_driver(renesas_usbhs_driver);
 645
 646 MODULE_LICENSE("GPL");
 647 MODULE_DESCRIPTION("Renesas USB driver");
 648 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");