drivers/usb/musb/musb_virthub.c

   1 /*
   2  * MUSB OTG driver virtual root hub support
   3  *
   4  * Copyright 2005 Mentor Graphics Corporation
   5  * Copyright (C) 2005-2006 by Texas Instruments
   6  * Copyright (C) 2006-2007 Nokia Corporation
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * version 2 as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  20  * 02110-1301 USA
  21  *
  22  * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
  23  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  24  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
  25  * NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  27  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  28  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  29  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  31  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  *
  33  */
  34
  35 #include <linux/module.h>
  36 #include <linux/kernel.h>
  37 #include <linux/sched.h>
  38 #include <linux/errno.h>
  39 #include <linux/time.h>
  40 #include <linux/timer.h>
  41
  42 #include <asm/unaligned.h>
  43
  44 #include "musb_core.h"
  45
  46 void musb_host_finish_resume(struct work_struct *work)
  47 {
  48         struct musb *musb;
  49         unsigned long flags;
  50         u8 power;
  51
  52         musb = container_of(work, struct musb, finish_resume_work.work);
  53
  54         spin_lock_irqsave(&musb->lock, flags);
  55
  56         power = musb_readb(musb->mregs, MUSB_POWER);
  57         power &= ~MUSB_POWER_RESUME;
  58         dev_dbg(musb->controller, "root port resume stopped, power %02x\n",
  59                 power);
  60         musb_writeb(musb->mregs, MUSB_POWER, power);
  61
  62         /*
  63          * ISSUE:  DaVinci (RTL 1.300) disconnects after
  64          * resume of high speed peripherals (but not full
  65          * speed ones).
  66          */
  67         musb->is_active = 1;
  68         musb->port1_status &= ~(USB_PORT_STAT_SUSPEND | MUSB_PORT_STAT_RESUME);
  69         musb->port1_status |= USB_PORT_STAT_C_SUSPEND << 16;
  70         usb_hcd_poll_rh_status(musb->hcd);
  71         /* NOTE: it might really be A_WAIT_BCON ... */
  72         musb->xceiv->otg->state = OTG_STATE_A_HOST;
  73
  74         spin_unlock_irqrestore(&musb->lock, flags);
  75 }
  76
  77 void musb_port_suspend(struct musb *musb, bool do_suspend)
  78 {
  79         struct usb_otg  *otg = musb->xceiv->otg;
  80         u8              power;
  81         void __iomem    *mbase = musb->mregs;
  82
  83         if (!is_host_active(musb))
  84                 return;
  85
  86         /* NOTE:  this doesn't necessarily put PHY into low power mode,
  87          * turning off its clock; that's a function of PHY integration and
  88          * MUSB_POWER_ENSUSPEND.  PHY may need a clock (sigh) to detect
  89          * SE0 changing to connect (J) or wakeup (K) states.
  90          */
  91         power = musb_readb(mbase, MUSB_POWER);
  92         if (do_suspend) {
  93                 int retries = 10000;
  94
  95                 power &= ~MUSB_POWER_RESUME;
  96                 power |= MUSB_POWER_SUSPENDM;
  97                 musb_writeb(mbase, MUSB_POWER, power);
  98
  99                 /* Needed for OPT A tests */
 100                 power = musb_readb(mbase, MUSB_POWER);
 101                 while (power & MUSB_POWER_SUSPENDM) {
 102                         power = musb_readb(mbase, MUSB_POWER);
 103                         if (retries-- < 1)
 104                                 break;
 105                 }
 106
 107                 dev_dbg(musb->controller, "Root port suspended, power %02x\n", power);
 108
 109                 musb->port1_status |= USB_PORT_STAT_SUSPEND;
 110                 switch (musb->xceiv->otg->state) {
 111                 case OTG_STATE_A_HOST:
 112                         musb->xceiv->otg->state = OTG_STATE_A_SUSPEND;
 113                         musb->is_active = otg->host->b_hnp_enable;
 114                         if (musb->is_active)
 115                                 mod_timer(&musb->otg_timer, jiffies
 116                                         + msecs_to_jiffies(
 117                                                 OTG_TIME_A_AIDL_BDIS));
 118                         musb_platform_try_idle(musb, 0);
 119                         break;
 120                 case OTG_STATE_B_HOST:
 121                         musb->xceiv->otg->state = OTG_STATE_B_WAIT_ACON;
 122                         musb->is_active = otg->host->b_hnp_enable;
 123                         musb_platform_try_idle(musb, 0);
 124                         break;
 125                 default:
 126                         dev_dbg(musb->controller, "bogus rh suspend? %s\n",
 127                                 usb_otg_state_string(musb->xceiv->otg->state));
 128                 }
 129         } else if (power & MUSB_POWER_SUSPENDM) {
 130                 power &= ~MUSB_POWER_SUSPENDM;
 131                 power |= MUSB_POWER_RESUME;
 132                 musb_writeb(mbase, MUSB_POWER, power);
 133
 134                 dev_dbg(musb->controller, "Root port resuming, power %02x\n", power);
 135
 136                 /* later, GetPortStatus will stop RESUME signaling */
 137                 musb->port1_status |= MUSB_PORT_STAT_RESUME;
 138                 schedule_delayed_work(&musb->finish_resume_work,
 139                                       msecs_to_jiffies(USB_RESUME_TIMEOUT));
 140         }
 141 }
 142
 143 void musb_port_reset(struct musb *musb, bool do_reset)
 144 {
 145         u8              power;
 146         void __iomem    *mbase = musb->mregs;
 147
 148         if (musb->xceiv->otg->state == OTG_STATE_B_IDLE) {
 149                 dev_dbg(musb->controller, "HNP: Returning from HNP; no hub reset from b_idle\n");
 150                 musb->port1_status &= ~USB_PORT_STAT_RESET;
 151                 return;
 152         }
 153
 154         if (!is_host_active(musb))
 155                 return;
 156
 157         /* NOTE:  caller guarantees it will turn off the reset when
 158          * the appropriate amount of time has passed
 159          */
 160         power = musb_readb(mbase, MUSB_POWER);
 161         if (do_reset) {
 162                 /*
 163                  * If RESUME is set, we must make sure it stays minimum 20 ms.
 164                  * Then we must clear RESUME and wait a bit to let musb start
 165                  * generating SOFs. If we don't do this, OPT HS A 6.8 tests
 166                  * fail with "Error! Did not receive an SOF before suspend
 167                  * detected".
 168                  */
 169                 if (power &  MUSB_POWER_RESUME) {
 170                         long remain = (unsigned long) musb->rh_timer - jiffies;
 171
 172                         if (musb->rh_timer > 0 && remain > 0) {
 173                                 /* take into account the minimum delay after resume */
 174                                 schedule_delayed_work(
 175                                         &musb->deassert_reset_work, remain);
 176                                 return;
 177                         }
 178
 179                         musb_writeb(mbase, MUSB_POWER,
 180                                     power & ~MUSB_POWER_RESUME);
 181
 182                         /* Give the core 1 ms to clear MUSB_POWER_RESUME */
 183                         schedule_delayed_work(&musb->deassert_reset_work,
 184                                               msecs_to_jiffies(1));
 185                         return;
 186                 }
 187
 188                 power &= 0xf0;
 189                 musb_writeb(mbase, MUSB_POWER,
 190                                 power | MUSB_POWER_RESET);
 191
 192                 musb->port1_status |= USB_PORT_STAT_RESET;
 193                 musb->port1_status &= ~USB_PORT_STAT_ENABLE;
 194                 schedule_delayed_work(&musb->deassert_reset_work,
 195                                       msecs_to_jiffies(50));
 196         } else {
 197                 dev_dbg(musb->controller, "root port reset stopped\n");
 198                 musb_platform_pre_root_reset_end(musb);
 199                 musb_writeb(mbase, MUSB_POWER,
 200                                 power & ~MUSB_POWER_RESET);
 201                 musb_platform_post_root_reset_end(musb);
 202
 203                 power = musb_readb(mbase, MUSB_POWER);
 204                 if (power & MUSB_POWER_HSMODE) {
 205                         dev_dbg(musb->controller, "high-speed device connected\n");
 206                         musb->port1_status |= USB_PORT_STAT_HIGH_SPEED;
 207                 }
 208
 209                 musb->port1_status &= ~USB_PORT_STAT_RESET;
 210                 musb->port1_status |= USB_PORT_STAT_ENABLE
 211                                         | (USB_PORT_STAT_C_RESET << 16)
 212                                         | (USB_PORT_STAT_C_ENABLE << 16);
 213                 usb_hcd_poll_rh_status(musb->hcd);
 214
 215                 musb->vbuserr_retry = VBUSERR_RETRY_COUNT;
 216         }
 217 }
 218
 219 void musb_root_disconnect(struct musb *musb)
 220 {
 221         struct usb_otg  *otg = musb->xceiv->otg;
 222
 223         musb->port1_status = USB_PORT_STAT_POWER
 224                         | (USB_PORT_STAT_C_CONNECTION << 16);
 225
 226         usb_hcd_poll_rh_status(musb->hcd);
 227         musb->is_active = 0;
 228
 229         switch (musb->xceiv->otg->state) {
 230         case OTG_STATE_A_SUSPEND:
 231                 if (otg->host->b_hnp_enable) {
 232                         musb->xceiv->otg->state = OTG_STATE_A_PERIPHERAL;
 233                         musb->g.is_a_peripheral = 1;
 234                         break;
 235                 }
 236                 /* FALLTHROUGH */
 237         case OTG_STATE_A_HOST:
 238                 musb->xceiv->otg->state = OTG_STATE_A_WAIT_BCON;
 239                 musb->is_active = 0;
 240                 break;
 241         case OTG_STATE_A_WAIT_VFALL:
 242                 musb->xceiv->otg->state = OTG_STATE_B_IDLE;
 243                 break;
 244         default:
 245                 dev_dbg(musb->controller, "host disconnect (%s)\n",
 246                         usb_otg_state_string(musb->xceiv->otg->state));
 247         }
 248 }
 249
 250
 251 /*---------------------------------------------------------------------*/
 252
 253 /* Caller may or may not hold musb->lock */
 254 int musb_hub_status_data(struct usb_hcd *hcd, char *buf)
 255 {
 256         struct musb     *musb = hcd_to_musb(hcd);
 257         int             retval = 0;
 258
 259         /* called in_irq() via usb_hcd_poll_rh_status() */
 260         if (musb->port1_status & 0xffff0000) {
 261                 *buf = 0x02;
 262                 retval = 1;
 263         }
 264         return retval;
 265 }
 266
 267 static int musb_has_gadget(struct musb *musb)
 268 {
 269         /*
 270          * In host-only mode we start a connection right away. In OTG mode
 271          * we have to wait until we loaded a gadget. We don't really need a
 272          * gadget if we operate as a host but we should not start a session
 273          * as a device without a gadget or else we explode.
 274          */
 275 #ifdef CONFIG_USB_MUSB_HOST
 276         return 1;
 277 #else
 278         return musb->port_mode == MUSB_PORT_MODE_HOST;
 279 #endif
 280 }
 281
 282 int musb_hub_control(
 283         struct usb_hcd  *hcd,
 284         u16             typeReq,
 285         u16             wValue,
 286         u16             wIndex,
 287         char            *buf,
 288         u16             wLength)
 289 {
 290         struct musb     *musb = hcd_to_musb(hcd);
 291         u32             temp;
 292         int             retval = 0;
 293         unsigned long   flags;
 294
 295         spin_lock_irqsave(&musb->lock, flags);
 296
 297         if (unlikely(!HCD_HW_ACCESSIBLE(hcd))) {
 298                 spin_unlock_irqrestore(&musb->lock, flags);
 299                 return -ESHUTDOWN;
 300         }
 301
 302         /* hub features:  always zero, setting is a NOP
 303          * port features: reported, sometimes updated when host is active
 304          * no indicators
 305          */
 306         switch (typeReq) {
 307         case ClearHubFeature:
 308         case SetHubFeature:
 309                 switch (wValue) {
 310                 case C_HUB_OVER_CURRENT:
 311                 case C_HUB_LOCAL_POWER:
 312                         break;
 313                 default:
 314                         goto error;
 315                 }
 316                 break;
 317         case ClearPortFeature:
 318                 if ((wIndex & 0xff) != 1)
 319                         goto error;
 320
 321                 switch (wValue) {
 322                 case USB_PORT_FEAT_ENABLE:
 323                         break;
 324                 case USB_PORT_FEAT_SUSPEND:
 325                         musb_port_suspend(musb, false);
 326                         break;
 327                 case USB_PORT_FEAT_POWER:
 328                         if (!hcd->self.is_b_host)
 329                                 musb_platform_set_vbus(musb, 0);
 330                         break;
 331                 case USB_PORT_FEAT_C_CONNECTION:
 332                 case USB_PORT_FEAT_C_ENABLE:
 333                 case USB_PORT_FEAT_C_OVER_CURRENT:
 334                 case USB_PORT_FEAT_C_RESET:
 335                 case USB_PORT_FEAT_C_SUSPEND:
 336                         break;
 337                 default:
 338                         goto error;
 339                 }
 340                 dev_dbg(musb->controller, "clear feature %d\n", wValue);
 341                 musb->port1_status &= ~(1 << wValue);
 342                 break;
 343         case GetHubDescriptor:
 344                 {
 345                 struct usb_hub_descriptor *desc = (void *)buf;
 346
 347                 desc->bDescLength = 9;
 348                 desc->bDescriptorType = USB_DT_HUB;
 349                 desc->bNbrPorts = 1;
 350                 desc->wHubCharacteristics = cpu_to_le16(
 351                         HUB_CHAR_INDV_PORT_LPSM /* per-port power switching */
 352                         | HUB_CHAR_NO_OCPM      /* no overcurrent reporting */
 353                         );
 354                 desc->bPwrOn2PwrGood = 5;       /* msec/2 */
 355                 desc->bHubContrCurrent = 0;
 356
 357                 /* workaround bogus struct definition */
 358                 desc->u.hs.DeviceRemovable[0] = 0x02;   /* port 1 */
 359                 desc->u.hs.DeviceRemovable[1] = 0xff;
 360                 }
 361                 break;
 362         case GetHubStatus:
 363                 temp = 0;
 364                 *(__le32 *) buf = cpu_to_le32(temp);
 365                 break;
 366         case GetPortStatus:
 367                 if (wIndex != 1)
 368                         goto error;
 369
 370                 put_unaligned(cpu_to_le32(musb->port1_status
 371                                         & ~MUSB_PORT_STAT_RESUME),
 372                                 (__le32 *) buf);
 373
 374                 /* port change status is more interesting */
 375                 dev_dbg(musb->controller, "port status %08x\n",
 376                                 musb->port1_status);
 377                 break;
 378         case SetPortFeature:
 379                 if ((wIndex & 0xff) != 1)
 380                         goto error;
 381
 382                 switch (wValue) {
 383                 case USB_PORT_FEAT_POWER:
 384                         /* NOTE: this controller has a strange state machine
 385                          * that involves "requesting sessions" according to
 386                          * magic side effects from incompletely-described
 387                          * rules about startup...
 388                          *
 389                          * This call is what really starts the host mode; be
 390                          * very careful about side effects if you reorder any
 391                          * initialization logic, e.g. for OTG, or change any
 392                          * logic relating to VBUS power-up.
 393                          */
 394                         if (!hcd->self.is_b_host && musb_has_gadget(musb))
 395                                 musb_start(musb);
 396                         break;
 397                 case USB_PORT_FEAT_RESET:
 398                         musb_port_reset(musb, true);
 399                         break;
 400                 case USB_PORT_FEAT_SUSPEND:
 401                         musb_port_suspend(musb, true);
 402                         break;
 403                 case USB_PORT_FEAT_TEST:
 404                         if (unlikely(is_host_active(musb)))
 405                                 goto error;
 406
 407                         wIndex >>= 8;
 408                         switch (wIndex) {
 409                         case 1:
 410                                 pr_debug("TEST_J\n");
 411                                 temp = MUSB_TEST_J;
 412                                 break;
 413                         case 2:
 414                                 pr_debug("TEST_K\n");
 415                                 temp = MUSB_TEST_K;
 416                                 break;
 417                         case 3:
 418                                 pr_debug("TEST_SE0_NAK\n");
 419                                 temp = MUSB_TEST_SE0_NAK;
 420                                 break;
 421                         case 4:
 422                                 pr_debug("TEST_PACKET\n");
 423                                 temp = MUSB_TEST_PACKET;
 424                                 musb_load_testpacket(musb);
 425                                 break;
 426                         case 5:
 427                                 pr_debug("TEST_FORCE_ENABLE\n");
 428                                 temp = MUSB_TEST_FORCE_HOST
 429                                         | MUSB_TEST_FORCE_HS;
 430
 431                                 musb_writeb(musb->mregs, MUSB_DEVCTL,
 432                                                 MUSB_DEVCTL_SESSION);
 433                                 break;
 434                         case 6:
 435                                 pr_debug("TEST_FIFO_ACCESS\n");
 436                                 temp = MUSB_TEST_FIFO_ACCESS;
 437                                 break;
 438                         default:
 439                                 goto error;
 440                         }
 441                         musb_writeb(musb->mregs, MUSB_TESTMODE, temp);
 442                         break;
 443                 default:
 444                         goto error;
 445                 }
 446                 dev_dbg(musb->controller, "set feature %d\n", wValue);
 447                 musb->port1_status |= 1 << wValue;
 448                 break;
 449
 450         default:
 451 error:
 452                 /* "protocol stall" on error */
 453                 retval = -EPIPE;
 454         }
 455         spin_unlock_irqrestore(&musb->lock, flags);
 456         return retval;
 457 }