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