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/init.h>
  40 #include <linux/time.h>
  41 #include <linux/timer.h>
  42
  43 #include <asm/unaligned.h>
  44
  45 #include "musb_core.h"
  46
  47 static void musb_port_suspend(struct musb *musb, bool do_suspend)
  48 {
  49         struct usb_otg  *otg = musb->xceiv->otg;
  50         u8              power;
  51         void __iomem    *mbase = musb->mregs;
  52
  53         if (!is_host_active(musb))
  54                 return;
  55
  56         /* NOTE:  this doesn't necessarily put PHY into low power mode,
  57          * turning off its clock; that's a function of PHY integration and
  58          * MUSB_POWER_ENSUSPEND.  PHY may need a clock (sigh) to detect
  59          * SE0 changing to connect (J) or wakeup (K) states.
  60          */
  61         power = musb_readb(mbase, MUSB_POWER);
  62         if (do_suspend) {
  63                 int retries = 10000;
  64
  65                 power &= ~MUSB_POWER_RESUME;
  66                 power |= MUSB_POWER_SUSPENDM;
  67                 musb_writeb(mbase, MUSB_POWER, power);
  68
  69                 /* Needed for OPT A tests */
  70                 power = musb_readb(mbase, MUSB_POWER);
  71                 while (power & MUSB_POWER_SUSPENDM) {
  72                         power = musb_readb(mbase, MUSB_POWER);
  73                         if (retries-- < 1)
  74                                 break;
  75                 }
  76
  77                 dev_dbg(musb->controller, "Root port suspended, power %02x\n", power);
  78
  79                 musb->port1_status |= USB_PORT_STAT_SUSPEND;
  80                 switch (musb->xceiv->state) {
  81                 case OTG_STATE_A_HOST:
  82                         musb->xceiv->state = OTG_STATE_A_SUSPEND;
  83                         musb->is_active = otg->host->b_hnp_enable;
  84                         if (musb->is_active)
  85                                 mod_timer(&musb->otg_timer, jiffies
  86                                         + msecs_to_jiffies(
  87                                                 OTG_TIME_A_AIDL_BDIS));
  88                         musb_platform_try_idle(musb, 0);
  89                         break;
  90                 case OTG_STATE_B_HOST:
  91                         musb->xceiv->state = OTG_STATE_B_WAIT_ACON;
  92                         musb->is_active = otg->host->b_hnp_enable;
  93                         musb_platform_try_idle(musb, 0);
  94                         break;
  95                 default:
  96                         dev_dbg(musb->controller, "bogus rh suspend? %s\n",
  97                                 usb_otg_state_string(musb->xceiv->state));
  98                 }
  99         } else if (power & MUSB_POWER_SUSPENDM) {
 100                 power &= ~MUSB_POWER_SUSPENDM;
 101                 power |= MUSB_POWER_RESUME;
 102                 musb_writeb(mbase, MUSB_POWER, power);
 103
 104                 dev_dbg(musb->controller, "Root port resuming, power %02x\n", power);
 105
 106                 /* later, GetPortStatus will stop RESUME signaling */
 107                 musb->port1_status |= MUSB_PORT_STAT_RESUME;
 108                 musb->rh_timer = jiffies + msecs_to_jiffies(USB_RESUME_TIMEOUT);
 109         }
 110 }
 111
 112 static void musb_port_reset(struct musb *musb, bool do_reset)
 113 {
 114         u8              power;
 115         void __iomem    *mbase = musb->mregs;
 116
 117         if (musb->xceiv->state == OTG_STATE_B_IDLE) {
 118                 dev_dbg(musb->controller, "HNP: Returning from HNP; no hub reset from b_idle\n");
 119                 musb->port1_status &= ~USB_PORT_STAT_RESET;
 120                 return;
 121         }
 122
 123         if (!is_host_active(musb))
 124                 return;
 125
 126         /* NOTE:  caller guarantees it will turn off the reset when
 127          * the appropriate amount of time has passed
 128          */
 129         power = musb_readb(mbase, MUSB_POWER);
 130         if (do_reset) {
 131
 132                 /*
 133                  * If RESUME is set, we must make sure it stays minimum 20 ms.
 134                  * Then we must clear RESUME and wait a bit to let musb start
 135                  * generating SOFs. If we don't do this, OPT HS A 6.8 tests
 136                  * fail with "Error! Did not receive an SOF before suspend
 137                  * detected".
 138                  */
 139                 if (power &  MUSB_POWER_RESUME) {
 140                         while (time_before(jiffies, musb->rh_timer))
 141                                 msleep(1);
 142                         musb_writeb(mbase, MUSB_POWER,
 143                                 power & ~MUSB_POWER_RESUME);
 144                         msleep(1);
 145                 }
 146
 147                 power &= 0xf0;
 148                 musb_writeb(mbase, MUSB_POWER,
 149                                 power | MUSB_POWER_RESET);
 150
 151                 musb->port1_status |= USB_PORT_STAT_RESET;
 152                 musb->port1_status &= ~USB_PORT_STAT_ENABLE;
 153                 musb->rh_timer = jiffies + msecs_to_jiffies(50);
 154         } else {
 155                 dev_dbg(musb->controller, "root port reset stopped\n");
 156                 musb_writeb(mbase, MUSB_POWER,
 157                                 power & ~MUSB_POWER_RESET);
 158
 159                 power = musb_readb(mbase, MUSB_POWER);
 160                 if (power & MUSB_POWER_HSMODE) {
 161                         dev_dbg(musb->controller, "high-speed device connected\n");
 162                         musb->port1_status |= USB_PORT_STAT_HIGH_SPEED;
 163                 }
 164
 165                 musb->port1_status &= ~USB_PORT_STAT_RESET;
 166                 musb->port1_status |= USB_PORT_STAT_ENABLE
 167                                         | (USB_PORT_STAT_C_RESET << 16)
 168                                         | (USB_PORT_STAT_C_ENABLE << 16);
 169                 usb_hcd_poll_rh_status(musb->hcd);
 170
 171                 musb->vbuserr_retry = VBUSERR_RETRY_COUNT;
 172         }
 173 }
 174
 175 void musb_root_disconnect(struct musb *musb)
 176 {
 177         struct usb_otg  *otg = musb->xceiv->otg;
 178
 179         musb->port1_status = USB_PORT_STAT_POWER
 180                         | (USB_PORT_STAT_C_CONNECTION << 16);
 181
 182         usb_hcd_poll_rh_status(musb->hcd);
 183         musb->is_active = 0;
 184
 185         switch (musb->xceiv->state) {
 186         case OTG_STATE_A_SUSPEND:
 187                 if (otg->host->b_hnp_enable) {
 188                         musb->xceiv->state = OTG_STATE_A_PERIPHERAL;
 189                         musb->g.is_a_peripheral = 1;
 190                         break;
 191                 }
 192                 /* FALLTHROUGH */
 193         case OTG_STATE_A_HOST:
 194                 musb->xceiv->state = OTG_STATE_A_WAIT_BCON;
 195                 musb->is_active = 0;
 196                 break;
 197         case OTG_STATE_A_WAIT_VFALL:
 198                 musb->xceiv->state = OTG_STATE_B_IDLE;
 199                 break;
 200         default:
 201                 dev_dbg(musb->controller, "host disconnect (%s)\n",
 202                         usb_otg_state_string(musb->xceiv->state));
 203         }
 204 }
 205
 206
 207 /*---------------------------------------------------------------------*/
 208
 209 /* Caller may or may not hold musb->lock */
 210 int musb_hub_status_data(struct usb_hcd *hcd, char *buf)
 211 {
 212         struct musb     *musb = hcd_to_musb(hcd);
 213         int             retval = 0;
 214
 215         /* called in_irq() via usb_hcd_poll_rh_status() */
 216         if (musb->port1_status & 0xffff0000) {
 217                 *buf = 0x02;
 218                 retval = 1;
 219         }
 220         return retval;
 221 }
 222
 223 static int musb_has_gadget(struct musb *musb)
 224 {
 225         /*
 226          * In host-only mode we start a connection right away. In OTG mode
 227          * we have to wait until we loaded a gadget. We don't really need a
 228          * gadget if we operate as a host but we should not start a session
 229          * as a device without a gadget or else we explode.
 230          */
 231 #ifdef CONFIG_USB_MUSB_HOST
 232         return 1;
 233 #else
 234         return musb->port_mode == MUSB_PORT_MODE_HOST;
 235 #endif
 236 }
 237
 238 int musb_hub_control(
 239         struct usb_hcd  *hcd,
 240         u16             typeReq,
 241         u16             wValue,
 242         u16             wIndex,
 243         char            *buf,
 244         u16             wLength)
 245 {
 246         struct musb     *musb = hcd_to_musb(hcd);
 247         u32             temp;
 248         int             retval = 0;
 249         unsigned long   flags;
 250
 251         spin_lock_irqsave(&musb->lock, flags);
 252
 253         if (unlikely(!HCD_HW_ACCESSIBLE(hcd))) {
 254                 spin_unlock_irqrestore(&musb->lock, flags);
 255                 return -ESHUTDOWN;
 256         }
 257
 258         /* hub features:  always zero, setting is a NOP
 259          * port features: reported, sometimes updated when host is active
 260          * no indicators
 261          */
 262         switch (typeReq) {
 263         case ClearHubFeature:
 264         case SetHubFeature:
 265                 switch (wValue) {
 266                 case C_HUB_OVER_CURRENT:
 267                 case C_HUB_LOCAL_POWER:
 268                         break;
 269                 default:
 270                         goto error;
 271                 }
 272                 break;
 273         case ClearPortFeature:
 274                 if ((wIndex & 0xff) != 1)
 275                         goto error;
 276
 277                 switch (wValue) {
 278                 case USB_PORT_FEAT_ENABLE:
 279                         break;
 280                 case USB_PORT_FEAT_SUSPEND:
 281                         musb_port_suspend(musb, false);
 282                         break;
 283                 case USB_PORT_FEAT_POWER:
 284                         if (!hcd->self.is_b_host)
 285                                 musb_platform_set_vbus(musb, 0);
 286                         break;
 287                 case USB_PORT_FEAT_C_CONNECTION:
 288                 case USB_PORT_FEAT_C_ENABLE:
 289                 case USB_PORT_FEAT_C_OVER_CURRENT:
 290                 case USB_PORT_FEAT_C_RESET:
 291                 case USB_PORT_FEAT_C_SUSPEND:
 292                         break;
 293                 default:
 294                         goto error;
 295                 }
 296                 dev_dbg(musb->controller, "clear feature %d\n", wValue);
 297                 musb->port1_status &= ~(1 << wValue);
 298                 break;
 299         case GetHubDescriptor:
 300                 {
 301                 struct usb_hub_descriptor *desc = (void *)buf;
 302
 303                 desc->bDescLength = 9;
 304                 desc->bDescriptorType = 0x29;
 305                 desc->bNbrPorts = 1;
 306                 desc->wHubCharacteristics = cpu_to_le16(
 307                                   0x0001        /* per-port power switching */
 308                                 | 0x0010        /* no overcurrent reporting */
 309                                 );
 310                 desc->bPwrOn2PwrGood = 5;       /* msec/2 */
 311                 desc->bHubContrCurrent = 0;
 312
 313                 /* workaround bogus struct definition */
 314                 desc->u.hs.DeviceRemovable[0] = 0x02;   /* port 1 */
 315                 desc->u.hs.DeviceRemovable[1] = 0xff;
 316                 }
 317                 break;
 318         case GetHubStatus:
 319                 temp = 0;
 320                 *(__le32 *) buf = cpu_to_le32(temp);
 321                 break;
 322         case GetPortStatus:
 323                 if (wIndex != 1)
 324                         goto error;
 325
 326                 /* finish RESET signaling? */
 327                 if ((musb->port1_status & USB_PORT_STAT_RESET)
 328                                 && time_after_eq(jiffies, musb->rh_timer))
 329                         musb_port_reset(musb, false);
 330
 331                 /* finish RESUME signaling? */
 332                 if ((musb->port1_status & MUSB_PORT_STAT_RESUME)
 333                                 && time_after_eq(jiffies, musb->rh_timer)) {
 334                         u8              power;
 335
 336                         power = musb_readb(musb->mregs, MUSB_POWER);
 337                         power &= ~MUSB_POWER_RESUME;
 338                         dev_dbg(musb->controller, "root port resume stopped, power %02x\n",
 339                                         power);
 340                         musb_writeb(musb->mregs, MUSB_POWER, power);
 341
 342                         /* ISSUE:  DaVinci (RTL 1.300) disconnects after
 343                          * resume of high speed peripherals (but not full
 344                          * speed ones).
 345                          */
 346
 347                         musb->is_active = 1;
 348                         musb->port1_status &= ~(USB_PORT_STAT_SUSPEND
 349                                         | MUSB_PORT_STAT_RESUME);
 350                         musb->port1_status |= USB_PORT_STAT_C_SUSPEND << 16;
 351                         usb_hcd_poll_rh_status(musb->hcd);
 352                         /* NOTE: it might really be A_WAIT_BCON ... */
 353                         musb->xceiv->state = OTG_STATE_A_HOST;
 354                 }
 355
 356                 put_unaligned(cpu_to_le32(musb->port1_status
 357                                         & ~MUSB_PORT_STAT_RESUME),
 358                                 (__le32 *) buf);
 359
 360                 /* port change status is more interesting */
 361                 dev_dbg(musb->controller, "port status %08x\n",
 362                                 musb->port1_status);
 363                 break;
 364         case SetPortFeature:
 365                 if ((wIndex & 0xff) != 1)
 366                         goto error;
 367
 368                 switch (wValue) {
 369                 case USB_PORT_FEAT_POWER:
 370                         /* NOTE: this controller has a strange state machine
 371                          * that involves "requesting sessions" according to
 372                          * magic side effects from incompletely-described
 373                          * rules about startup...
 374                          *
 375                          * This call is what really starts the host mode; be
 376                          * very careful about side effects if you reorder any
 377                          * initialization logic, e.g. for OTG, or change any
 378                          * logic relating to VBUS power-up.
 379                          */
 380                         if (!hcd->self.is_b_host && musb_has_gadget(musb))
 381                                 musb_start(musb);
 382                         break;
 383                 case USB_PORT_FEAT_RESET:
 384                         musb_port_reset(musb, true);
 385                         break;
 386                 case USB_PORT_FEAT_SUSPEND:
 387                         musb_port_suspend(musb, true);
 388                         break;
 389                 case USB_PORT_FEAT_TEST:
 390                         if (unlikely(is_host_active(musb)))
 391                                 goto error;
 392
 393                         wIndex >>= 8;
 394                         switch (wIndex) {
 395                         case 1:
 396                                 pr_debug("TEST_J\n");
 397                                 temp = MUSB_TEST_J;
 398                                 break;
 399                         case 2:
 400                                 pr_debug("TEST_K\n");
 401                                 temp = MUSB_TEST_K;
 402                                 break;
 403                         case 3:
 404                                 pr_debug("TEST_SE0_NAK\n");
 405                                 temp = MUSB_TEST_SE0_NAK;
 406                                 break;
 407                         case 4:
 408                                 pr_debug("TEST_PACKET\n");
 409                                 temp = MUSB_TEST_PACKET;
 410                                 musb_load_testpacket(musb);
 411                                 break;
 412                         case 5:
 413                                 pr_debug("TEST_FORCE_ENABLE\n");
 414                                 temp = MUSB_TEST_FORCE_HOST
 415                                         | MUSB_TEST_FORCE_HS;
 416
 417                                 musb_writeb(musb->mregs, MUSB_DEVCTL,
 418                                                 MUSB_DEVCTL_SESSION);
 419                                 break;
 420                         case 6:
 421                                 pr_debug("TEST_FIFO_ACCESS\n");
 422                                 temp = MUSB_TEST_FIFO_ACCESS;
 423                                 break;
 424                         default:
 425                                 goto error;
 426                         }
 427                         musb_writeb(musb->mregs, MUSB_TESTMODE, temp);
 428                         break;
 429                 default:
 430                         goto error;
 431                 }
 432                 dev_dbg(musb->controller, "set feature %d\n", wValue);
 433                 musb->port1_status |= 1 << wValue;
 434                 break;
 435
 436         default:
 437 error:
 438                 /* "protocol stall" on error */
 439                 retval = -EPIPE;
 440         }
 441         spin_unlock_irqrestore(&musb->lock, flags);
 442         return retval;
 443 }