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                 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 = 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                         dev_dbg(musb->controller, "bogus rh suspend? %s\n",
 101                                 otg_state_string(musb->xceiv->state));
 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                 dev_dbg(musb->controller, "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                 dev_dbg(musb->controller, "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                 dev_dbg(musb->controller, "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                         dev_dbg(musb->controller, "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 = USB_PORT_STAT_POWER
 187                         | (USB_PORT_STAT_C_CONNECTION << 16);
 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                 dev_dbg(musb->controller, "host disconnect (%s)\n",
 212                         otg_state_string(musb->xceiv->state));
 213         }
 214 }
 215
 216
 217 /*---------------------------------------------------------------------*/
 218
 219 /* Caller may or may not hold musb->lock */
 220 int musb_hub_status_data(struct usb_hcd *hcd, char *buf)
 221 {
 222         struct musb     *musb = hcd_to_musb(hcd);
 223         int             retval = 0;
 224
 225         /* called in_irq() via usb_hcd_poll_rh_status() */
 226         if (musb->port1_status & 0xffff0000) {
 227                 *buf = 0x02;
 228                 retval = 1;
 229         }
 230         return retval;
 231 }
 232
 233 int musb_hub_control(
 234         struct usb_hcd  *hcd,
 235         u16             typeReq,
 236         u16             wValue,
 237         u16             wIndex,
 238         char            *buf,
 239         u16             wLength)
 240 {
 241         struct musb     *musb = hcd_to_musb(hcd);
 242         u32             temp;
 243         int             retval = 0;
 244         unsigned long   flags;
 245
 246         spin_lock_irqsave(&musb->lock, flags);
 247
 248         if (unlikely(!HCD_HW_ACCESSIBLE(hcd))) {
 249                 spin_unlock_irqrestore(&musb->lock, flags);
 250                 return -ESHUTDOWN;
 251         }
 252
 253         /* hub features:  always zero, setting is a NOP
 254          * port features: reported, sometimes updated when host is active
 255          * no indicators
 256          */
 257         switch (typeReq) {
 258         case ClearHubFeature:
 259         case SetHubFeature:
 260                 switch (wValue) {
 261                 case C_HUB_OVER_CURRENT:
 262                 case C_HUB_LOCAL_POWER:
 263                         break;
 264                 default:
 265                         goto error;
 266                 }
 267                 break;
 268         case ClearPortFeature:
 269                 if ((wIndex & 0xff) != 1)
 270                         goto error;
 271
 272                 switch (wValue) {
 273                 case USB_PORT_FEAT_ENABLE:
 274                         break;
 275                 case USB_PORT_FEAT_SUSPEND:
 276                         musb_port_suspend(musb, false);
 277                         break;
 278                 case USB_PORT_FEAT_POWER:
 279                         if (!(is_otg_enabled(musb) && hcd->self.is_b_host))
 280                                 musb_platform_set_vbus(musb, 0);
 281                         break;
 282                 case USB_PORT_FEAT_C_CONNECTION:
 283                 case USB_PORT_FEAT_C_ENABLE:
 284                 case USB_PORT_FEAT_C_OVER_CURRENT:
 285                 case USB_PORT_FEAT_C_RESET:
 286                 case USB_PORT_FEAT_C_SUSPEND:
 287                         break;
 288                 default:
 289                         goto error;
 290                 }
 291                 dev_dbg(musb->controller, "clear feature %d\n", wValue);
 292                 musb->port1_status &= ~(1 << wValue);
 293                 break;
 294         case GetHubDescriptor:
 295                 {
 296                 struct usb_hub_descriptor *desc = (void *)buf;
 297
 298                 desc->bDescLength = 9;
 299                 desc->bDescriptorType = 0x29;
 300                 desc->bNbrPorts = 1;
 301                 desc->wHubCharacteristics = cpu_to_le16(
 302                                   0x0001        /* per-port power switching */
 303                                 | 0x0010        /* no overcurrent reporting */
 304                                 );
 305                 desc->bPwrOn2PwrGood = 5;       /* msec/2 */
 306                 desc->bHubContrCurrent = 0;
 307
 308                 /* workaround bogus struct definition */
 309                 desc->u.hs.DeviceRemovable[0] = 0x02;   /* port 1 */
 310                 desc->u.hs.DeviceRemovable[1] = 0xff;
 311                 }
 312                 break;
 313         case GetHubStatus:
 314                 temp = 0;
 315                 *(__le32 *) buf = cpu_to_le32(temp);
 316                 break;
 317         case GetPortStatus:
 318                 if (wIndex != 1)
 319                         goto error;
 320
 321                 /* finish RESET signaling? */
 322                 if ((musb->port1_status & USB_PORT_STAT_RESET)
 323                                 && time_after_eq(jiffies, musb->rh_timer))
 324                         musb_port_reset(musb, false);
 325
 326                 /* finish RESUME signaling? */
 327                 if ((musb->port1_status & MUSB_PORT_STAT_RESUME)
 328                                 && time_after_eq(jiffies, musb->rh_timer)) {
 329                         u8              power;
 330
 331                         power = musb_readb(musb->mregs, MUSB_POWER);
 332                         power &= ~MUSB_POWER_RESUME;
 333                         dev_dbg(musb->controller, "root port resume stopped, power %02x\n",
 334                                         power);
 335                         musb_writeb(musb->mregs, MUSB_POWER, power);
 336
 337                         /* ISSUE:  DaVinci (RTL 1.300) disconnects after
 338                          * resume of high speed peripherals (but not full
 339                          * speed ones).
 340                          */
 341
 342                         musb->is_active = 1;
 343                         musb->port1_status &= ~(USB_PORT_STAT_SUSPEND
 344                                         | MUSB_PORT_STAT_RESUME);
 345                         musb->port1_status |= USB_PORT_STAT_C_SUSPEND << 16;
 346                         usb_hcd_poll_rh_status(musb_to_hcd(musb));
 347                         /* NOTE: it might really be A_WAIT_BCON ... */
 348                         musb->xceiv->state = OTG_STATE_A_HOST;
 349                 }
 350
 351                 put_unaligned(cpu_to_le32(musb->port1_status
 352                                         & ~MUSB_PORT_STAT_RESUME),
 353                                 (__le32 *) buf);
 354
 355                 /* port change status is more interesting */
 356                 dev_dbg(musb->controller, "port status %08x\n",
 357                                 musb->port1_status);
 358                 break;
 359         case SetPortFeature:
 360                 if ((wIndex & 0xff) != 1)
 361                         goto error;
 362
 363                 switch (wValue) {
 364                 case USB_PORT_FEAT_POWER:
 365                         /* NOTE: this controller has a strange state machine
 366                          * that involves "requesting sessions" according to
 367                          * magic side effects from incompletely-described
 368                          * rules about startup...
 369                          *
 370                          * This call is what really starts the host mode; be
 371                          * very careful about side effects if you reorder any
 372                          * initialization logic, e.g. for OTG, or change any
 373                          * logic relating to VBUS power-up.
 374                          */
 375                         if (!(is_otg_enabled(musb) && hcd->self.is_b_host))
 376                                 musb_start(musb);
 377                         break;
 378                 case USB_PORT_FEAT_RESET:
 379                         musb_port_reset(musb, true);
 380                         break;
 381                 case USB_PORT_FEAT_SUSPEND:
 382                         musb_port_suspend(musb, true);
 383                         break;
 384                 case USB_PORT_FEAT_TEST:
 385                         if (unlikely(is_host_active(musb)))
 386                                 goto error;
 387
 388                         wIndex >>= 8;
 389                         switch (wIndex) {
 390                         case 1:
 391                                 pr_debug("TEST_J\n");
 392                                 temp = MUSB_TEST_J;
 393                                 break;
 394                         case 2:
 395                                 pr_debug("TEST_K\n");
 396                                 temp = MUSB_TEST_K;
 397                                 break;
 398                         case 3:
 399                                 pr_debug("TEST_SE0_NAK\n");
 400                                 temp = MUSB_TEST_SE0_NAK;
 401                                 break;
 402                         case 4:
 403                                 pr_debug("TEST_PACKET\n");
 404                                 temp = MUSB_TEST_PACKET;
 405                                 musb_load_testpacket(musb);
 406                                 break;
 407                         case 5:
 408                                 pr_debug("TEST_FORCE_ENABLE\n");
 409                                 temp = MUSB_TEST_FORCE_HOST
 410                                         | MUSB_TEST_FORCE_HS;
 411
 412                                 musb_writeb(musb->mregs, MUSB_DEVCTL,
 413                                                 MUSB_DEVCTL_SESSION);
 414                                 break;
 415                         case 6:
 416                                 pr_debug("TEST_FIFO_ACCESS\n");
 417                                 temp = MUSB_TEST_FIFO_ACCESS;
 418                                 break;
 419                         default:
 420                                 goto error;
 421                         }
 422                         musb_writeb(musb->mregs, MUSB_TESTMODE, temp);
 423                         break;
 424                 default:
 425                         goto error;
 426                 }
 427                 dev_dbg(musb->controller, "set feature %d\n", wValue);
 428                 musb->port1_status |= 1 << wValue;
 429                 break;
 430
 431         default:
 432 error:
 433                 /* "protocol stall" on error */
 434                 retval = -EPIPE;
 435         }
 436         spin_unlock_irqrestore(&musb->lock, flags);
 437         return retval;
 438 }