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 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_hispeed_ctrl(struct usbhs_priv *priv, int enable)
 104 {
 105         usbhs_bset(priv, SYSCFG, HSE, enable ? HSE : 0);
 106 }
 107
 108 void usbhs_sys_usb_ctrl(struct usbhs_priv *priv, int enable)
 109 {
 110         usbhs_bset(priv, SYSCFG, USBE, enable ? USBE : 0);
 111 }
 112
 113 void usbhs_sys_host_ctrl(struct usbhs_priv *priv, int enable)
 114 {
 115         u16 mask = DCFM | DRPD | DPRPU;
 116         u16 val  = DCFM | DRPD;
 117         int has_otg = usbhs_get_dparam(priv, has_otg);
 118
 119         if (has_otg)
 120                 usbhs_bset(priv, DVSTCTR, (EXTLP | PWEN), (EXTLP | PWEN));
 121
 122         /*
 123          * if enable
 124          *
 125          * - select Host mode
 126          * - D+ Line/D- Line Pull-down
 127          */
 128         usbhs_bset(priv, SYSCFG, mask, enable ? val : 0);
 129 }
 130
 131 void usbhs_sys_function_ctrl(struct usbhs_priv *priv, int enable)
 132 {
 133         u16 mask = DCFM | DRPD | DPRPU;
 134         u16 val  = DPRPU;
 135
 136         /*
 137          * if enable
 138          *
 139          * - select Function mode
 140          * - D+ Line Pull-up
 141          */
 142         usbhs_bset(priv, SYSCFG, mask, enable ? val : 0);
 143 }
 144
 145 /*
 146  *              frame functions
 147  */
 148 int usbhs_frame_get_num(struct usbhs_priv *priv)
 149 {
 150         return usbhs_read(priv, FRMNUM) & FRNM_MASK;
 151 }
 152
 153 /*
 154  *              usb request functions
 155  */
 156 void usbhs_usbreq_get_val(struct usbhs_priv *priv, struct usb_ctrlrequest *req)
 157 {
 158         u16 val;
 159
 160         val = usbhs_read(priv, USBREQ);
 161         req->bRequest           = (val >> 8) & 0xFF;
 162         req->bRequestType       = (val >> 0) & 0xFF;
 163
 164         req->wValue     = usbhs_read(priv, USBVAL);
 165         req->wIndex     = usbhs_read(priv, USBINDX);
 166         req->wLength    = usbhs_read(priv, USBLENG);
 167 }
 168
 169 void usbhs_usbreq_set_val(struct usbhs_priv *priv, struct usb_ctrlrequest *req)
 170 {
 171         usbhs_write(priv, USBREQ,  (req->bRequest << 8) | req->bRequestType);
 172         usbhs_write(priv, USBVAL,  req->wValue);
 173         usbhs_write(priv, USBINDX, req->wIndex);
 174         usbhs_write(priv, USBLENG, req->wLength);
 175
 176         usbhs_bset(priv, DCPCTR, SUREQ, SUREQ);
 177 }
 178
 179 /*
 180  *              bus/vbus functions
 181  */
 182 void usbhs_bus_send_sof_enable(struct usbhs_priv *priv)
 183 {
 184         u16 status = usbhs_read(priv, DVSTCTR) & (USBRST | UACT);
 185
 186         if (status != USBRST) {
 187                 struct device *dev = usbhs_priv_to_dev(priv);
 188                 dev_err(dev, "usbhs should be reset\n");
 189         }
 190
 191         usbhs_bset(priv, DVSTCTR, (USBRST | UACT), UACT);
 192 }
 193
 194 void usbhs_bus_send_reset(struct usbhs_priv *priv)
 195 {
 196         usbhs_bset(priv, DVSTCTR, (USBRST | UACT), USBRST);
 197 }
 198
 199 int usbhs_bus_get_speed(struct usbhs_priv *priv)
 200 {
 201         u16 dvstctr = usbhs_read(priv, DVSTCTR);
 202
 203         switch (RHST & dvstctr) {
 204         case RHST_LOW_SPEED:
 205                 return USB_SPEED_LOW;
 206         case RHST_FULL_SPEED:
 207                 return USB_SPEED_FULL;
 208         case RHST_HIGH_SPEED:
 209                 return USB_SPEED_HIGH;
 210         }
 211
 212         return USB_SPEED_UNKNOWN;
 213 }
 214
 215 int usbhs_vbus_ctrl(struct usbhs_priv *priv, int enable)
 216 {
 217         struct platform_device *pdev = usbhs_priv_to_pdev(priv);
 218
 219         return usbhs_platform_call(priv, set_vbus, pdev, enable);
 220 }
 221
 222 static void usbhsc_bus_init(struct usbhs_priv *priv)
 223 {
 224         usbhs_write(priv, DVSTCTR, 0);
 225
 226         usbhs_vbus_ctrl(priv, 0);
 227 }
 228
 229 /*
 230  *              device configuration
 231  */
 232 int usbhs_set_device_speed(struct usbhs_priv *priv, int devnum,
 233                            u16 upphub, u16 hubport, u16 speed)
 234 {
 235         struct device *dev = usbhs_priv_to_dev(priv);
 236         u16 usbspd = 0;
 237         u32 reg = DEVADD0 + (2 * devnum);
 238
 239         if (devnum > 10) {
 240                 dev_err(dev, "cannot set speed to unknown device %d\n", devnum);
 241                 return -EIO;
 242         }
 243
 244         if (upphub > 0xA) {
 245                 dev_err(dev, "unsupported hub number %d\n", upphub);
 246                 return -EIO;
 247         }
 248
 249         switch (speed) {
 250         case USB_SPEED_LOW:
 251                 usbspd = USBSPD_SPEED_LOW;
 252                 break;
 253         case USB_SPEED_FULL:
 254                 usbspd = USBSPD_SPEED_FULL;
 255                 break;
 256         case USB_SPEED_HIGH:
 257                 usbspd = USBSPD_SPEED_HIGH;
 258                 break;
 259         default:
 260                 dev_err(dev, "unsupported speed %d\n", speed);
 261                 return -EIO;
 262         }
 263
 264         usbhs_write(priv, reg,  UPPHUB(upphub)  |
 265                                 HUBPORT(hubport)|
 266                                 USBSPD(usbspd));
 267
 268         return 0;
 269 }
 270
 271 /*
 272  *              local functions
 273  */
 274 static void usbhsc_set_buswait(struct usbhs_priv *priv)
 275 {
 276         int wait = usbhs_get_dparam(priv, buswait_bwait);
 277
 278         /* set bus wait if platform have */
 279         if (wait)
 280                 usbhs_bset(priv, BUSWAIT, 0x000F, wait);
 281 }
 282
 283 /*
 284  *              platform default param
 285  */
 286 static u32 usbhsc_default_pipe_type[] = {
 287                 USB_ENDPOINT_XFER_CONTROL,
 288                 USB_ENDPOINT_XFER_ISOC,
 289                 USB_ENDPOINT_XFER_ISOC,
 290                 USB_ENDPOINT_XFER_BULK,
 291                 USB_ENDPOINT_XFER_BULK,
 292                 USB_ENDPOINT_XFER_BULK,
 293                 USB_ENDPOINT_XFER_INT,
 294                 USB_ENDPOINT_XFER_INT,
 295                 USB_ENDPOINT_XFER_INT,
 296                 USB_ENDPOINT_XFER_INT,
 297 };
 298
 299 /*
 300  *              power control
 301  */
 302 static void usbhsc_power_ctrl(struct usbhs_priv *priv, int enable)
 303 {
 304         struct device *dev = usbhs_priv_to_dev(priv);
 305
 306         if (enable) {
 307                 /* enable PM */
 308                 pm_runtime_get_sync(dev);
 309
 310                 /* USB on */
 311                 usbhs_sys_clock_ctrl(priv, enable);
 312         } else {
 313                 /* USB off */
 314                 usbhs_sys_clock_ctrl(priv, enable);
 315
 316                 /* disable PM */
 317                 pm_runtime_put_sync(dev);
 318         }
 319 }
 320
 321 /*
 322  *              hotplug
 323  */
 324 static void usbhsc_hotplug(struct usbhs_priv *priv)
 325 {
 326         struct platform_device *pdev = usbhs_priv_to_pdev(priv);
 327         struct usbhs_mod *mod = usbhs_mod_get_current(priv);
 328         int id;
 329         int enable;
 330         int ret;
 331
 332         /*
 333          * get vbus status from platform
 334          */
 335         enable = usbhs_platform_call(priv, get_vbus, pdev);
 336
 337         /*
 338          * get id from platform
 339          */
 340         id = usbhs_platform_call(priv, get_id, pdev);
 341
 342         if (enable && !mod) {
 343                 ret = usbhs_mod_change(priv, id);
 344                 if (ret < 0)
 345                         return;
 346
 347                 dev_dbg(&pdev->dev, "%s enable\n", __func__);
 348
 349                 /* power on */
 350                 if (usbhsc_flags_has(priv, USBHSF_RUNTIME_PWCTRL))
 351                         usbhsc_power_ctrl(priv, enable);
 352
 353                 /* bus init */
 354                 usbhsc_set_buswait(priv);
 355                 usbhsc_bus_init(priv);
 356
 357                 /* module start */
 358                 usbhs_mod_call(priv, start, priv);
 359
 360         } else if (!enable && mod) {
 361                 dev_dbg(&pdev->dev, "%s disable\n", __func__);
 362
 363                 /* module stop */
 364                 usbhs_mod_call(priv, stop, priv);
 365
 366                 /* bus init */
 367                 usbhsc_bus_init(priv);
 368
 369                 /* power off */
 370                 if (usbhsc_flags_has(priv, USBHSF_RUNTIME_PWCTRL))
 371                         usbhsc_power_ctrl(priv, enable);
 372
 373                 usbhs_mod_change(priv, -1);
 374
 375                 /* reset phy for next connection */
 376                 usbhs_platform_call(priv, phy_reset, pdev);
 377         }
 378 }
 379
 380 /*
 381  *              notify hotplug
 382  */
 383 static void usbhsc_notify_hotplug(struct work_struct *work)
 384 {
 385         struct usbhs_priv *priv = container_of(work,
 386                                                struct usbhs_priv,
 387                                                notify_hotplug_work.work);
 388         usbhsc_hotplug(priv);
 389 }
 390
 391 int usbhsc_drvcllbck_notify_hotplug(struct platform_device *pdev)
 392 {
 393         struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
 394         int delay = usbhs_get_dparam(priv, detection_delay);
 395
 396         /*
 397          * This functions will be called in interrupt.
 398          * To make sure safety context,
 399          * use workqueue for usbhs_notify_hotplug
 400          */
 401         schedule_delayed_work(&priv->notify_hotplug_work, delay);
 402         return 0;
 403 }
 404
 405 /*
 406  *              platform functions
 407  */
 408 static int usbhs_probe(struct platform_device *pdev)
 409 {
 410         struct renesas_usbhs_platform_info *info = pdev->dev.platform_data;
 411         struct renesas_usbhs_driver_callback *dfunc;
 412         struct usbhs_priv *priv;
 413         struct resource *res;
 414         unsigned int irq;
 415         int ret;
 416
 417         /* check platform information */
 418         if (!info ||
 419             !info->platform_callback.get_id) {
 420                 dev_err(&pdev->dev, "no platform information\n");
 421                 return -EINVAL;
 422         }
 423
 424         /* platform data */
 425         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 426         irq = platform_get_irq(pdev, 0);
 427         if (!res || (int)irq <= 0) {
 428                 dev_err(&pdev->dev, "Not enough Renesas USB platform resources.\n");
 429                 return -ENODEV;
 430         }
 431
 432         /* usb private data */
 433         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 434         if (!priv) {
 435                 dev_err(&pdev->dev, "Could not allocate priv\n");
 436                 return -ENOMEM;
 437         }
 438
 439         priv->base = ioremap_nocache(res->start, resource_size(res));
 440         if (!priv->base) {
 441                 dev_err(&pdev->dev, "ioremap error.\n");
 442                 ret = -ENOMEM;
 443                 goto probe_end_kfree;
 444         }
 445
 446         /*
 447          * care platform info
 448          */
 449         memcpy(&priv->pfunc,
 450                &info->platform_callback,
 451                sizeof(struct renesas_usbhs_platform_callback));
 452         memcpy(&priv->dparam,
 453                &info->driver_param,
 454                sizeof(struct renesas_usbhs_driver_param));
 455
 456         /* set driver callback functions for platform */
 457         dfunc                   = &info->driver_callback;
 458         dfunc->notify_hotplug   = usbhsc_drvcllbck_notify_hotplug;
 459
 460         /* set default param if platform doesn't have */
 461         if (!priv->dparam.pipe_type) {
 462                 priv->dparam.pipe_type = usbhsc_default_pipe_type;
 463                 priv->dparam.pipe_size = ARRAY_SIZE(usbhsc_default_pipe_type);
 464         }
 465         if (!priv->dparam.pio_dma_border)
 466                 priv->dparam.pio_dma_border = 64; /* 64byte */
 467
 468         /* FIXME */
 469         /* runtime power control ? */
 470         if (priv->pfunc.get_vbus)
 471                 usbhsc_flags_set(priv, USBHSF_RUNTIME_PWCTRL);
 472
 473         /*
 474          * priv settings
 475          */
 476         priv->irq       = irq;
 477         priv->pdev      = pdev;
 478         INIT_DELAYED_WORK(&priv->notify_hotplug_work, usbhsc_notify_hotplug);
 479         spin_lock_init(usbhs_priv_to_lock(priv));
 480
 481         /* call pipe and module init */
 482         ret = usbhs_pipe_probe(priv);
 483         if (ret < 0)
 484                 goto probe_end_iounmap;
 485
 486         ret = usbhs_fifo_probe(priv);
 487         if (ret < 0)
 488                 goto probe_end_pipe_exit;
 489
 490         ret = usbhs_mod_probe(priv);
 491         if (ret < 0)
 492                 goto probe_end_fifo_exit;
 493
 494         /* dev_set_drvdata should be called after usbhs_mod_init */
 495         dev_set_drvdata(&pdev->dev, priv);
 496
 497         /*
 498          * deviece reset here because
 499          * USB device might be used in boot loader.
 500          */
 501         usbhs_sys_clock_ctrl(priv, 0);
 502
 503         /*
 504          * platform call
 505          *
 506          * USB phy setup might depend on CPU/Board.
 507          * If platform has its callback functions,
 508          * call it here.
 509          */
 510         ret = usbhs_platform_call(priv, hardware_init, pdev);
 511         if (ret < 0) {
 512                 dev_err(&pdev->dev, "platform prove failed.\n");
 513                 goto probe_end_mod_exit;
 514         }
 515
 516         /* reset phy for connection */
 517         usbhs_platform_call(priv, phy_reset, pdev);
 518
 519         /* power control */
 520         pm_runtime_enable(&pdev->dev);
 521         if (!usbhsc_flags_has(priv, USBHSF_RUNTIME_PWCTRL)) {
 522                 usbhsc_power_ctrl(priv, 1);
 523                 usbhs_mod_autonomy_mode(priv);
 524         }
 525
 526         /*
 527          * manual call notify_hotplug for cold plug
 528          */
 529         ret = usbhsc_drvcllbck_notify_hotplug(pdev);
 530         if (ret < 0)
 531                 goto probe_end_call_remove;
 532
 533         dev_info(&pdev->dev, "probed\n");
 534
 535         return ret;
 536
 537 probe_end_call_remove:
 538         usbhs_platform_call(priv, hardware_exit, pdev);
 539 probe_end_mod_exit:
 540         usbhs_mod_remove(priv);
 541 probe_end_fifo_exit:
 542         usbhs_fifo_remove(priv);
 543 probe_end_pipe_exit:
 544         usbhs_pipe_remove(priv);
 545 probe_end_iounmap:
 546         iounmap(priv->base);
 547 probe_end_kfree:
 548         kfree(priv);
 549
 550         dev_info(&pdev->dev, "probe failed\n");
 551
 552         return ret;
 553 }
 554
 555 static int __devexit usbhs_remove(struct platform_device *pdev)
 556 {
 557         struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
 558         struct renesas_usbhs_platform_info *info = pdev->dev.platform_data;
 559         struct renesas_usbhs_driver_callback *dfunc = &info->driver_callback;
 560
 561         dev_dbg(&pdev->dev, "usb remove\n");
 562
 563         dfunc->notify_hotplug = NULL;
 564
 565         /* power off */
 566         if (!usbhsc_flags_has(priv, USBHSF_RUNTIME_PWCTRL))
 567                 usbhsc_power_ctrl(priv, 0);
 568
 569         pm_runtime_disable(&pdev->dev);
 570
 571         usbhs_platform_call(priv, hardware_exit, pdev);
 572         usbhs_mod_remove(priv);
 573         usbhs_fifo_remove(priv);
 574         usbhs_pipe_remove(priv);
 575         iounmap(priv->base);
 576         kfree(priv);
 577
 578         return 0;
 579 }
 580
 581 static int usbhsc_suspend(struct device *dev)
 582 {
 583         struct usbhs_priv *priv = dev_get_drvdata(dev);
 584         struct usbhs_mod *mod = usbhs_mod_get_current(priv);
 585
 586         if (mod) {
 587                 usbhs_mod_call(priv, stop, priv);
 588                 usbhs_mod_change(priv, -1);
 589         }
 590
 591         if (mod || !usbhsc_flags_has(priv, USBHSF_RUNTIME_PWCTRL))
 592                 usbhsc_power_ctrl(priv, 0);
 593
 594         return 0;
 595 }
 596
 597 static int usbhsc_resume(struct device *dev)
 598 {
 599         struct usbhs_priv *priv = dev_get_drvdata(dev);
 600         struct platform_device *pdev = usbhs_priv_to_pdev(priv);
 601
 602         usbhs_platform_call(priv, phy_reset, pdev);
 603
 604         if (!usbhsc_flags_has(priv, USBHSF_RUNTIME_PWCTRL))
 605                 usbhsc_power_ctrl(priv, 1);
 606
 607         usbhsc_hotplug(priv);
 608
 609         return 0;
 610 }
 611
 612 static int usbhsc_runtime_nop(struct device *dev)
 613 {
 614         /* Runtime PM callback shared between ->runtime_suspend()
 615          * and ->runtime_resume(). Simply returns success.
 616          *
 617          * This driver re-initializes all registers after
 618          * pm_runtime_get_sync() anyway so there is no need
 619          * to save and restore registers here.
 620          */
 621         return 0;
 622 }
 623
 624 static const struct dev_pm_ops usbhsc_pm_ops = {
 625         .suspend                = usbhsc_suspend,
 626         .resume                 = usbhsc_resume,
 627         .runtime_suspend        = usbhsc_runtime_nop,
 628         .runtime_resume         = usbhsc_runtime_nop,
 629 };
 630
 631 static struct platform_driver renesas_usbhs_driver = {
 632         .driver         = {
 633                 .name   = "renesas_usbhs",
 634                 .pm     = &usbhsc_pm_ops,
 635         },
 636         .probe          = usbhs_probe,
 637         .remove         = __devexit_p(usbhs_remove),
 638 };
 639
 640 static int __init usbhs_init(void)
 641 {
 642         return platform_driver_register(&renesas_usbhs_driver);
 643 }
 644
 645 static void __exit usbhs_exit(void)
 646 {
 647         platform_driver_unregister(&renesas_usbhs_driver);
 648 }
 649
 650 module_init(usbhs_init);
 651 module_exit(usbhs_exit);
 652
 653 MODULE_LICENSE("GPL");
 654 MODULE_DESCRIPTION("Renesas USB driver");
 655 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");