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->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->state) {
 111                 case OTG_STATE_A_HOST:
 112                         musb->xceiv->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->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->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, 20);
 139         }
 140 }
 141
 142 void musb_port_reset(struct musb *musb, bool do_reset)
 143 {
 144         u8              power;
 145         void __iomem    *mbase = musb->mregs;
 146
 147         if (musb->xceiv->state == OTG_STATE_B_IDLE) {
 148                 dev_dbg(musb->controller, "HNP: Returning from HNP; no hub reset from b_idle\n");
 149                 musb->port1_status &= ~USB_PORT_STAT_RESET;
 150                 return;
 151         }
 152
 153         if (!is_host_active(musb))
 154                 return;
 155
 156         /* NOTE:  caller guarantees it will turn off the reset when
 157          * the appropriate amount of time has passed
 158          */
 159         power = musb_readb(mbase, MUSB_POWER);
 160         if (do_reset) {
 161
 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                         while (time_before(jiffies, musb->rh_timer))
 171                                 msleep(1);
 172                         musb_writeb(mbase, MUSB_POWER,
 173                                 power & ~MUSB_POWER_RESUME);
 174                         msleep(1);
 175                 }
 176
 177                 power &= 0xf0;
 178                 musb_writeb(mbase, MUSB_POWER,
 179                                 power | MUSB_POWER_RESET);
 180
 181                 musb->port1_status |= USB_PORT_STAT_RESET;
 182                 musb->port1_status &= ~USB_PORT_STAT_ENABLE;
 183                 schedule_delayed_work(&musb->deassert_reset_work, 50);
 184         } else {
 185                 dev_dbg(musb->controller, "root port reset stopped\n");
 186                 musb_writeb(mbase, MUSB_POWER,
 187                                 power & ~MUSB_POWER_RESET);
 188
 189                 power = musb_readb(mbase, MUSB_POWER);
 190                 if (power & MUSB_POWER_HSMODE) {
 191                         dev_dbg(musb->controller, "high-speed device connected\n");
 192                         musb->port1_status |= USB_PORT_STAT_HIGH_SPEED;
 193                 }
 194
 195                 musb->port1_status &= ~USB_PORT_STAT_RESET;
 196                 musb->port1_status |= USB_PORT_STAT_ENABLE
 197                                         | (USB_PORT_STAT_C_RESET << 16)
 198                                         | (USB_PORT_STAT_C_ENABLE << 16);
 199                 usb_hcd_poll_rh_status(musb->hcd);
 200
 201                 musb->vbuserr_retry = VBUSERR_RETRY_COUNT;
 202         }
 203 }
 204
 205 void musb_root_disconnect(struct musb *musb)
 206 {
 207         struct usb_otg  *otg = musb->xceiv->otg;
 208
 209         musb->port1_status = USB_PORT_STAT_POWER
 210                         | (USB_PORT_STAT_C_CONNECTION << 16);
 211
 212         usb_hcd_poll_rh_status(musb->hcd);
 213         musb->is_active = 0;
 214
 215         switch (musb->xceiv->state) {
 216         case OTG_STATE_A_SUSPEND:
 217                 if (otg->host->b_hnp_enable) {
 218                         musb->xceiv->state = OTG_STATE_A_PERIPHERAL;
 219                         musb->g.is_a_peripheral = 1;
 220                         break;
 221                 }
 222                 /* FALLTHROUGH */
 223         case OTG_STATE_A_HOST:
 224                 musb->xceiv->state = OTG_STATE_A_WAIT_BCON;
 225                 musb->is_active = 0;
 226                 break;
 227         case OTG_STATE_A_WAIT_VFALL:
 228                 musb->xceiv->state = OTG_STATE_B_IDLE;
 229                 break;
 230         default:
 231                 dev_dbg(musb->controller, "host disconnect (%s)\n",
 232                         usb_otg_state_string(musb->xceiv->state));
 233         }
 234 }
 235
 236
 237 /*---------------------------------------------------------------------*/
 238
 239 /* Caller may or may not hold musb->lock */
 240 int musb_hub_status_data(struct usb_hcd *hcd, char *buf)
 241 {
 242         struct musb     *musb = hcd_to_musb(hcd);
 243         int             retval = 0;
 244
 245         /* called in_irq() via usb_hcd_poll_rh_status() */
 246         if (musb->port1_status & 0xffff0000) {
 247                 *buf = 0x02;
 248                 retval = 1;
 249         }
 250         return retval;
 251 }
 252
 253 static int musb_has_gadget(struct musb *musb)
 254 {
 255         /*
 256          * In host-only mode we start a connection right away. In OTG mode
 257          * we have to wait until we loaded a gadget. We don't really need a
 258          * gadget if we operate as a host but we should not start a session
 259          * as a device without a gadget or else we explode.
 260          */
 261 #ifdef CONFIG_USB_MUSB_HOST
 262         return 1;
 263 #else
 264         if (musb->port_mode == MUSB_PORT_MODE_HOST)
 265                 return 1;
 266         return musb->g.dev.driver != NULL;
 267 #endif
 268 }
 269
 270 int musb_hub_control(
 271         struct usb_hcd  *hcd,
 272         u16             typeReq,
 273         u16             wValue,
 274         u16             wIndex,
 275         char            *buf,
 276         u16             wLength)
 277 {
 278         struct musb     *musb = hcd_to_musb(hcd);
 279         u32             temp;
 280         int             retval = 0;
 281         unsigned long   flags;
 282
 283         spin_lock_irqsave(&musb->lock, flags);
 284
 285         if (unlikely(!HCD_HW_ACCESSIBLE(hcd))) {
 286                 spin_unlock_irqrestore(&musb->lock, flags);
 287                 return -ESHUTDOWN;
 288         }
 289
 290         /* hub features:  always zero, setting is a NOP
 291          * port features: reported, sometimes updated when host is active
 292          * no indicators
 293          */
 294         switch (typeReq) {
 295         case ClearHubFeature:
 296         case SetHubFeature:
 297                 switch (wValue) {
 298                 case C_HUB_OVER_CURRENT:
 299                 case C_HUB_LOCAL_POWER:
 300                         break;
 301                 default:
 302                         goto error;
 303                 }
 304                 break;
 305         case ClearPortFeature:
 306                 if ((wIndex & 0xff) != 1)
 307                         goto error;
 308
 309                 switch (wValue) {
 310                 case USB_PORT_FEAT_ENABLE:
 311                         break;
 312                 case USB_PORT_FEAT_SUSPEND:
 313                         musb_port_suspend(musb, false);
 314                         break;
 315                 case USB_PORT_FEAT_POWER:
 316                         if (!hcd->self.is_b_host)
 317                                 musb_platform_set_vbus(musb, 0);
 318                         break;
 319                 case USB_PORT_FEAT_C_CONNECTION:
 320                 case USB_PORT_FEAT_C_ENABLE:
 321                 case USB_PORT_FEAT_C_OVER_CURRENT:
 322                 case USB_PORT_FEAT_C_RESET:
 323                 case USB_PORT_FEAT_C_SUSPEND:
 324                         break;
 325                 default:
 326                         goto error;
 327                 }
 328                 dev_dbg(musb->controller, "clear feature %d\n", wValue);
 329                 musb->port1_status &= ~(1 << wValue);
 330                 break;
 331         case GetHubDescriptor:
 332                 {
 333                 struct usb_hub_descriptor *desc = (void *)buf;
 334
 335                 desc->bDescLength = 9;
 336                 desc->bDescriptorType = 0x29;
 337                 desc->bNbrPorts = 1;
 338                 desc->wHubCharacteristics = cpu_to_le16(
 339                                   0x0001        /* per-port power switching */
 340                                 | 0x0010        /* no overcurrent reporting */
 341                                 );
 342                 desc->bPwrOn2PwrGood = 5;       /* msec/2 */
 343                 desc->bHubContrCurrent = 0;
 344
 345                 /* workaround bogus struct definition */
 346                 desc->u.hs.DeviceRemovable[0] = 0x02;   /* port 1 */
 347                 desc->u.hs.DeviceRemovable[1] = 0xff;
 348                 }
 349                 break;
 350         case GetHubStatus:
 351                 temp = 0;
 352                 *(__le32 *) buf = cpu_to_le32(temp);
 353                 break;
 354         case GetPortStatus:
 355                 if (wIndex != 1)
 356                         goto error;
 357
 358                 put_unaligned(cpu_to_le32(musb->port1_status
 359                                         & ~MUSB_PORT_STAT_RESUME),
 360                                 (__le32 *) buf);
 361
 362                 /* port change status is more interesting */
 363                 dev_dbg(musb->controller, "port status %08x\n",
 364                                 musb->port1_status);
 365                 break;
 366         case SetPortFeature:
 367                 if ((wIndex & 0xff) != 1)
 368                         goto error;
 369
 370                 switch (wValue) {
 371                 case USB_PORT_FEAT_POWER:
 372                         /* NOTE: this controller has a strange state machine
 373                          * that involves "requesting sessions" according to
 374                          * magic side effects from incompletely-described
 375                          * rules about startup...
 376                          *
 377                          * This call is what really starts the host mode; be
 378                          * very careful about side effects if you reorder any
 379                          * initialization logic, e.g. for OTG, or change any
 380                          * logic relating to VBUS power-up.
 381                          */
 382                         if (!hcd->self.is_b_host && musb_has_gadget(musb))
 383                                 musb_start(musb);
 384                         break;
 385                 case USB_PORT_FEAT_RESET:
 386                         musb_port_reset(musb, true);
 387                         break;
 388                 case USB_PORT_FEAT_SUSPEND:
 389                         musb_port_suspend(musb, true);
 390                         break;
 391                 case USB_PORT_FEAT_TEST:
 392                         if (unlikely(is_host_active(musb)))
 393                                 goto error;
 394
 395                         wIndex >>= 8;
 396                         switch (wIndex) {
 397                         case 1:
 398                                 pr_debug("TEST_J\n");
 399                                 temp = MUSB_TEST_J;
 400                                 break;
 401                         case 2:
 402                                 pr_debug("TEST_K\n");
 403                                 temp = MUSB_TEST_K;
 404                                 break;
 405                         case 3:
 406                                 pr_debug("TEST_SE0_NAK\n");
 407                                 temp = MUSB_TEST_SE0_NAK;
 408                                 break;
 409                         case 4:
 410                                 pr_debug("TEST_PACKET\n");
 411                                 temp = MUSB_TEST_PACKET;
 412                                 musb_load_testpacket(musb);
 413                                 break;
 414                         case 5:
 415                                 pr_debug("TEST_FORCE_ENABLE\n");
 416                                 temp = MUSB_TEST_FORCE_HOST
 417                                         | MUSB_TEST_FORCE_HS;
 418
 419                                 musb_writeb(musb->mregs, MUSB_DEVCTL,
 420                                                 MUSB_DEVCTL_SESSION);
 421                                 break;
 422                         case 6:
 423                                 pr_debug("TEST_FIFO_ACCESS\n");
 424                                 temp = MUSB_TEST_FIFO_ACCESS;
 425                                 break;
 426                         default:
 427                                 goto error;
 428                         }
 429                         musb_writeb(musb->mregs, MUSB_TESTMODE, temp);
 430                         break;
 431                 default:
 432                         goto error;
 433                 }
 434                 dev_dbg(musb->controller, "set feature %d\n", wValue);
 435                 musb->port1_status |= 1 << wValue;
 436                 break;
 437
 438         default:
 439 error:
 440                 /* "protocol stall" on error */
 441                 retval = -EPIPE;
 442         }
 443         spin_unlock_irqrestore(&musb->lock, flags);
 444         return retval;
 445 }