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 musb_dbg(musb, "root port resume stopped, power %02x", power); 59 musb_writeb(musb->mregs, MUSB_POWER, power); 60 61 /* 62 * ISSUE: DaVinci (RTL 1.300) disconnects after 63 * resume of high speed peripherals (but not full 64 * speed ones). 65 */ 66 musb->is_active = 1; 67 musb->port1_status &= ~(USB_PORT_STAT_SUSPEND | MUSB_PORT_STAT_RESUME); 68 musb->port1_status |= USB_PORT_STAT_C_SUSPEND << 16; 69 usb_hcd_poll_rh_status(musb->hcd); 70 /* NOTE: it might really be A_WAIT_BCON ... */ 71 musb->xceiv->otg->state = OTG_STATE_A_HOST; 72 73 spin_unlock_irqrestore(&musb->lock, flags); 74 } 75 76 void musb_port_suspend(struct musb *musb, bool do_suspend) 77 { 78 struct usb_otg *otg = musb->xceiv->otg; 79 u8 power; 80 void __iomem *mbase = musb->mregs; 81 82 if (!is_host_active(musb)) 83 return; 84 85 /* NOTE: this doesn't necessarily put PHY into low power mode, 86 * turning off its clock; that's a function of PHY integration and 87 * MUSB_POWER_ENSUSPEND. PHY may need a clock (sigh) to detect 88 * SE0 changing to connect (J) or wakeup (K) states. 89 */ 90 power = musb_readb(mbase, MUSB_POWER); 91 if (do_suspend) { 92 int retries = 10000; 93 94 power &= ~MUSB_POWER_RESUME; 95 power |= MUSB_POWER_SUSPENDM; 96 musb_writeb(mbase, MUSB_POWER, power); 97 98 /* Needed for OPT A tests */ 99 power = musb_readb(mbase, MUSB_POWER); 100 while (power & MUSB_POWER_SUSPENDM) { 101 power = musb_readb(mbase, MUSB_POWER); 102 if (retries-- < 1) 103 break; 104 } 105 106 musb_dbg(musb, "Root port suspended, power %02x", power); 107 108 musb->port1_status |= USB_PORT_STAT_SUSPEND; 109 switch (musb->xceiv->otg->state) { 110 case OTG_STATE_A_HOST: 111 musb->xceiv->otg->state = OTG_STATE_A_SUSPEND; 112 musb->is_active = otg->host->b_hnp_enable; 113 if (musb->is_active) 114 mod_timer(&musb->otg_timer, jiffies 115 + msecs_to_jiffies( 116 OTG_TIME_A_AIDL_BDIS)); 117 musb_platform_try_idle(musb, 0); 118 break; 119 case OTG_STATE_B_HOST: 120 musb->xceiv->otg->state = OTG_STATE_B_WAIT_ACON; 121 musb->is_active = otg->host->b_hnp_enable; 122 musb_platform_try_idle(musb, 0); 123 break; 124 default: 125 musb_dbg(musb, "bogus rh suspend? %s", 126 usb_otg_state_string(musb->xceiv->otg->state)); 127 } 128 } else if (power & MUSB_POWER_SUSPENDM) { 129 power &= ~MUSB_POWER_SUSPENDM; 130 power |= MUSB_POWER_RESUME; 131 musb_writeb(mbase, MUSB_POWER, power); 132 133 musb_dbg(musb, "Root port resuming, power %02x", power); 134 135 /* later, GetPortStatus will stop RESUME signaling */ 136 musb->port1_status |= MUSB_PORT_STAT_RESUME; 137 schedule_delayed_work(&musb->finish_resume_work, 138 msecs_to_jiffies(USB_RESUME_TIMEOUT)); 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->otg->state == OTG_STATE_B_IDLE) { 148 musb_dbg(musb, "HNP: Returning from HNP; no hub reset from b_idle"); 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 * If RESUME is set, we must make sure it stays minimum 20 ms. 163 * Then we must clear RESUME and wait a bit to let musb start 164 * generating SOFs. If we don't do this, OPT HS A 6.8 tests 165 * fail with "Error! Did not receive an SOF before suspend 166 * detected". 167 */ 168 if (power & MUSB_POWER_RESUME) { 169 long remain = (unsigned long) musb->rh_timer - jiffies; 170 171 if (musb->rh_timer > 0 && remain > 0) { 172 /* take into account the minimum delay after resume */ 173 schedule_delayed_work( 174 &musb->deassert_reset_work, remain); 175 return; 176 } 177 178 musb_writeb(mbase, MUSB_POWER, 179 power & ~MUSB_POWER_RESUME); 180 181 /* Give the core 1 ms to clear MUSB_POWER_RESUME */ 182 schedule_delayed_work(&musb->deassert_reset_work, 183 msecs_to_jiffies(1)); 184 return; 185 } 186 187 power &= 0xf0; 188 musb_writeb(mbase, MUSB_POWER, 189 power | MUSB_POWER_RESET); 190 191 musb->port1_status |= USB_PORT_STAT_RESET; 192 musb->port1_status &= ~USB_PORT_STAT_ENABLE; 193 schedule_delayed_work(&musb->deassert_reset_work, 194 msecs_to_jiffies(50)); 195 } else { 196 musb_dbg(musb, "root port reset stopped"); 197 musb_platform_pre_root_reset_end(musb); 198 musb_writeb(mbase, MUSB_POWER, 199 power & ~MUSB_POWER_RESET); 200 musb_platform_post_root_reset_end(musb); 201 202 power = musb_readb(mbase, MUSB_POWER); 203 if (power & MUSB_POWER_HSMODE) { 204 musb_dbg(musb, "high-speed device connected"); 205 musb->port1_status |= USB_PORT_STAT_HIGH_SPEED; 206 } 207 208 musb->port1_status &= ~USB_PORT_STAT_RESET; 209 musb->port1_status |= USB_PORT_STAT_ENABLE 210 | (USB_PORT_STAT_C_RESET << 16) 211 | (USB_PORT_STAT_C_ENABLE << 16); 212 usb_hcd_poll_rh_status(musb->hcd); 213 214 musb->vbuserr_retry = VBUSERR_RETRY_COUNT; 215 } 216 } 217 218 void musb_root_disconnect(struct musb *musb) 219 { 220 struct usb_otg *otg = musb->xceiv->otg; 221 222 musb->port1_status = USB_PORT_STAT_POWER 223 | (USB_PORT_STAT_C_CONNECTION << 16); 224 225 usb_hcd_poll_rh_status(musb->hcd); 226 musb->is_active = 0; 227 228 switch (musb->xceiv->otg->state) { 229 case OTG_STATE_A_SUSPEND: 230 if (otg->host->b_hnp_enable) { 231 musb->xceiv->otg->state = OTG_STATE_A_PERIPHERAL; 232 musb->g.is_a_peripheral = 1; 233 break; 234 } 235 /* FALLTHROUGH */ 236 case OTG_STATE_A_HOST: 237 musb->xceiv->otg->state = OTG_STATE_A_WAIT_BCON; 238 musb->is_active = 0; 239 break; 240 case OTG_STATE_A_WAIT_VFALL: 241 musb->xceiv->otg->state = OTG_STATE_B_IDLE; 242 break; 243 default: 244 musb_dbg(musb, "host disconnect (%s)", 245 usb_otg_state_string(musb->xceiv->otg->state)); 246 } 247 } 248 EXPORT_SYMBOL_GPL(musb_root_disconnect); 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 bool start_musb = false; 295 296 spin_lock_irqsave(&musb->lock, flags); 297 298 if (unlikely(!HCD_HW_ACCESSIBLE(hcd))) { 299 spin_unlock_irqrestore(&musb->lock, flags); 300 return -ESHUTDOWN; 301 } 302 303 /* hub features: always zero, setting is a NOP 304 * port features: reported, sometimes updated when host is active 305 * no indicators 306 */ 307 switch (typeReq) { 308 case ClearHubFeature: 309 case SetHubFeature: 310 switch (wValue) { 311 case C_HUB_OVER_CURRENT: 312 case C_HUB_LOCAL_POWER: 313 break; 314 default: 315 goto error; 316 } 317 break; 318 case ClearPortFeature: 319 if ((wIndex & 0xff) != 1) 320 goto error; 321 322 switch (wValue) { 323 case USB_PORT_FEAT_ENABLE: 324 break; 325 case USB_PORT_FEAT_SUSPEND: 326 musb_port_suspend(musb, false); 327 break; 328 case USB_PORT_FEAT_POWER: 329 if (!hcd->self.is_b_host) 330 musb_platform_set_vbus(musb, 0); 331 break; 332 case USB_PORT_FEAT_C_CONNECTION: 333 case USB_PORT_FEAT_C_ENABLE: 334 case USB_PORT_FEAT_C_OVER_CURRENT: 335 case USB_PORT_FEAT_C_RESET: 336 case USB_PORT_FEAT_C_SUSPEND: 337 break; 338 default: 339 goto error; 340 } 341 musb_dbg(musb, "clear feature %d", wValue); 342 musb->port1_status &= ~(1 << wValue); 343 break; 344 case GetHubDescriptor: 345 { 346 struct usb_hub_descriptor *desc = (void *)buf; 347 348 desc->bDescLength = 9; 349 desc->bDescriptorType = USB_DT_HUB; 350 desc->bNbrPorts = 1; 351 desc->wHubCharacteristics = cpu_to_le16( 352 HUB_CHAR_INDV_PORT_LPSM /* per-port power switching */ 353 | HUB_CHAR_NO_OCPM /* no overcurrent reporting */ 354 ); 355 desc->bPwrOn2PwrGood = 5; /* msec/2 */ 356 desc->bHubContrCurrent = 0; 357 358 /* workaround bogus struct definition */ 359 desc->u.hs.DeviceRemovable[0] = 0x02; /* port 1 */ 360 desc->u.hs.DeviceRemovable[1] = 0xff; 361 } 362 break; 363 case GetHubStatus: 364 temp = 0; 365 *(__le32 *) buf = cpu_to_le32(temp); 366 break; 367 case GetPortStatus: 368 if (wIndex != 1) 369 goto error; 370 371 put_unaligned(cpu_to_le32(musb->port1_status 372 & ~MUSB_PORT_STAT_RESUME), 373 (__le32 *) buf); 374 375 /* port change status is more interesting */ 376 musb_dbg(musb, "port status %08x", 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 start_musb = true; 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 musb_dbg(musb, "set feature %d", 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); 456 457 if (start_musb) 458 musb_start(musb); 459 460 return retval; 461 } 462