musb_virthub.c revision 869c597829817af4b9f85c5e4181c622918dc781
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 47void 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(20); 109 } 110} 111 112void 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 175void 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 */ 210int 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 223static 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 if (musb->port_mode == MUSB_PORT_MODE_HOST) 235 return 1; 236 return musb->g.dev.driver != NULL; 237#endif 238} 239 240int musb_hub_control( 241 struct usb_hcd *hcd, 242 u16 typeReq, 243 u16 wValue, 244 u16 wIndex, 245 char *buf, 246 u16 wLength) 247{ 248 struct musb *musb = hcd_to_musb(hcd); 249 u32 temp; 250 int retval = 0; 251 unsigned long flags; 252 253 spin_lock_irqsave(&musb->lock, flags); 254 255 if (unlikely(!HCD_HW_ACCESSIBLE(hcd))) { 256 spin_unlock_irqrestore(&musb->lock, flags); 257 return -ESHUTDOWN; 258 } 259 260 /* hub features: always zero, setting is a NOP 261 * port features: reported, sometimes updated when host is active 262 * no indicators 263 */ 264 switch (typeReq) { 265 case ClearHubFeature: 266 case SetHubFeature: 267 switch (wValue) { 268 case C_HUB_OVER_CURRENT: 269 case C_HUB_LOCAL_POWER: 270 break; 271 default: 272 goto error; 273 } 274 break; 275 case ClearPortFeature: 276 if ((wIndex & 0xff) != 1) 277 goto error; 278 279 switch (wValue) { 280 case USB_PORT_FEAT_ENABLE: 281 break; 282 case USB_PORT_FEAT_SUSPEND: 283 musb_port_suspend(musb, false); 284 break; 285 case USB_PORT_FEAT_POWER: 286 if (!hcd->self.is_b_host) 287 musb_platform_set_vbus(musb, 0); 288 break; 289 case USB_PORT_FEAT_C_CONNECTION: 290 case USB_PORT_FEAT_C_ENABLE: 291 case USB_PORT_FEAT_C_OVER_CURRENT: 292 case USB_PORT_FEAT_C_RESET: 293 case USB_PORT_FEAT_C_SUSPEND: 294 break; 295 default: 296 goto error; 297 } 298 dev_dbg(musb->controller, "clear feature %d\n", wValue); 299 musb->port1_status &= ~(1 << wValue); 300 break; 301 case GetHubDescriptor: 302 { 303 struct usb_hub_descriptor *desc = (void *)buf; 304 305 desc->bDescLength = 9; 306 desc->bDescriptorType = 0x29; 307 desc->bNbrPorts = 1; 308 desc->wHubCharacteristics = cpu_to_le16( 309 0x0001 /* per-port power switching */ 310 | 0x0010 /* no overcurrent reporting */ 311 ); 312 desc->bPwrOn2PwrGood = 5; /* msec/2 */ 313 desc->bHubContrCurrent = 0; 314 315 /* workaround bogus struct definition */ 316 desc->u.hs.DeviceRemovable[0] = 0x02; /* port 1 */ 317 desc->u.hs.DeviceRemovable[1] = 0xff; 318 } 319 break; 320 case GetHubStatus: 321 temp = 0; 322 *(__le32 *) buf = cpu_to_le32(temp); 323 break; 324 case GetPortStatus: 325 if (wIndex != 1) 326 goto error; 327 328 /* finish RESET signaling? */ 329 if ((musb->port1_status & USB_PORT_STAT_RESET) 330 && time_after_eq(jiffies, musb->rh_timer)) 331 musb_port_reset(musb, false); 332 333 /* finish RESUME signaling? */ 334 if ((musb->port1_status & MUSB_PORT_STAT_RESUME) 335 && time_after_eq(jiffies, musb->rh_timer)) { 336 u8 power; 337 338 power = musb_readb(musb->mregs, MUSB_POWER); 339 power &= ~MUSB_POWER_RESUME; 340 dev_dbg(musb->controller, "root port resume stopped, power %02x\n", 341 power); 342 musb_writeb(musb->mregs, MUSB_POWER, power); 343 344 /* ISSUE: DaVinci (RTL 1.300) disconnects after 345 * resume of high speed peripherals (but not full 346 * speed ones). 347 */ 348 349 musb->is_active = 1; 350 musb->port1_status &= ~(USB_PORT_STAT_SUSPEND 351 | MUSB_PORT_STAT_RESUME); 352 musb->port1_status |= USB_PORT_STAT_C_SUSPEND << 16; 353 usb_hcd_poll_rh_status(musb->hcd); 354 /* NOTE: it might really be A_WAIT_BCON ... */ 355 musb->xceiv->state = OTG_STATE_A_HOST; 356 } 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: 439error: 440 /* "protocol stall" on error */ 441 retval = -EPIPE; 442 } 443 spin_unlock_irqrestore(&musb->lock, flags); 444 return retval; 445} 446