Ido Shayevitz | cdeef4c | 2012-05-29 13:17:41 +0200 | [diff] [blame] | 1 | /** |
| 2 | * dwc3_otg.c - DesignWare USB3 DRD Controller OTG |
| 3 | * |
| 4 | * Copyright (c) 2012, Code Aurora Forum. All rights reserved. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 and |
| 8 | * only version 2 as published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | */ |
| 15 | |
| 16 | #include <linux/usb.h> |
| 17 | #include <linux/usb/hcd.h> |
| 18 | #include <linux/platform_device.h> |
| 19 | |
| 20 | #include "core.h" |
| 21 | #include "dwc3_otg.h" |
| 22 | #include "io.h" |
| 23 | #include "xhci.h" |
| 24 | |
| 25 | |
| 26 | /** |
| 27 | * dwc3_otg_set_host_regs - reset dwc3 otg registers to host operation. |
| 28 | * |
| 29 | * This function sets the OTG registers to work in A-Device host mode. |
| 30 | * This function should be called just before entering to A-Device mode. |
| 31 | * |
| 32 | * @w: Pointer to the dwc3 otg workqueue. |
| 33 | */ |
| 34 | static void dwc3_otg_set_host_regs(struct dwc3_otg *dotg) |
| 35 | { |
| 36 | u32 octl; |
| 37 | |
| 38 | /* Set OCTL[6](PeriMode) to 0 (host) */ |
| 39 | octl = dwc3_readl(dotg->regs, DWC3_OCTL); |
| 40 | octl &= ~DWC3_OTG_OCTL_PERIMODE; |
| 41 | dwc3_writel(dotg->regs, DWC3_OCTL, octl); |
| 42 | |
| 43 | /* |
| 44 | * TODO: add more OTG registers writes for HOST mode here, |
| 45 | * see figure 12-10 A-device flow in dwc3 Synopsis spec |
| 46 | */ |
| 47 | } |
| 48 | |
| 49 | /** |
| 50 | * dwc3_otg_set_peripheral_regs - reset dwc3 otg registers to peripheral operation. |
| 51 | * |
| 52 | * This function sets the OTG registers to work in B-Device peripheral mode. |
| 53 | * This function should be called just before entering to B-Device mode. |
| 54 | * |
| 55 | * @w: Pointer to the dwc3 otg workqueue. |
| 56 | */ |
| 57 | static void dwc3_otg_set_peripheral_regs(struct dwc3_otg *dotg) |
| 58 | { |
| 59 | u32 octl; |
| 60 | |
| 61 | /* Set OCTL[6](PeriMode) to 1 (peripheral) */ |
| 62 | octl = dwc3_readl(dotg->regs, DWC3_OCTL); |
| 63 | octl |= DWC3_OTG_OCTL_PERIMODE; |
| 64 | dwc3_writel(dotg->regs, DWC3_OCTL, octl); |
| 65 | |
| 66 | /* |
| 67 | * TODO: add more OTG registers writes for PERIPHERAL mode here, |
| 68 | * see figure 12-19 B-device flow in dwc3 Synopsis spec |
| 69 | */ |
| 70 | } |
| 71 | |
| 72 | /** |
| 73 | * dwc3_otg_start_host - helper function for starting/stoping the host controller driver. |
| 74 | * |
| 75 | * @otg: Pointer to the otg_transceiver structure. |
| 76 | * @on: start / stop the host controller driver. |
| 77 | * |
| 78 | * Returns 0 on success otherwise negative errno. |
| 79 | */ |
| 80 | static int dwc3_otg_start_host(struct usb_otg *otg, int on) |
| 81 | { |
| 82 | struct dwc3_otg *dotg = container_of(otg, struct dwc3_otg, otg); |
| 83 | struct usb_hcd *hcd; |
| 84 | struct xhci_hcd *xhci; |
| 85 | int ret = 0; |
| 86 | |
| 87 | if (!otg->host) |
| 88 | return -EINVAL; |
| 89 | |
| 90 | hcd = bus_to_hcd(otg->host); |
| 91 | xhci = hcd_to_xhci(hcd); |
| 92 | if (on) { |
| 93 | dev_dbg(otg->phy->dev, "%s: turn on host %s\n", |
| 94 | __func__, otg->host->bus_name); |
| 95 | dwc3_otg_set_host_regs(dotg); |
| 96 | |
| 97 | /* |
| 98 | * This should be revisited for more testing post-silicon. |
| 99 | * In worst case we may need to disconnect the root hub |
| 100 | * before stopping the controller so that it does not |
| 101 | * interfere with runtime pm/system pm. |
| 102 | * We can also consider registering and unregistering xhci |
| 103 | * platform device. It is almost similar to add_hcd and |
| 104 | * remove_hcd, But we may not use standard set_host method |
| 105 | * anymore. |
| 106 | */ |
| 107 | ret = hcd->driver->start(hcd); |
| 108 | if (ret) { |
| 109 | dev_err(otg->phy->dev, |
| 110 | "%s: failed to start primary hcd, ret=%d\n", |
| 111 | __func__, ret); |
| 112 | return ret; |
| 113 | } |
| 114 | |
| 115 | ret = xhci->shared_hcd->driver->start(xhci->shared_hcd); |
| 116 | if (ret) { |
| 117 | dev_err(otg->phy->dev, |
| 118 | "%s: failed to start secondary hcd, ret=%d\n", |
| 119 | __func__, ret); |
| 120 | return ret; |
| 121 | } |
| 122 | } else { |
| 123 | dev_dbg(otg->phy->dev, "%s: turn off host %s\n", |
| 124 | __func__, otg->host->bus_name); |
| 125 | hcd->driver->stop(hcd); |
| 126 | } |
| 127 | |
| 128 | return 0; |
| 129 | } |
| 130 | |
| 131 | /** |
| 132 | * dwc3_otg_set_host - bind/unbind the host controller driver. |
| 133 | * |
| 134 | * @otg: Pointer to the otg_transceiver structure. |
| 135 | * @host: Pointer to the usb_bus structure. |
| 136 | * |
| 137 | * Returns 0 on success otherwise negative errno. |
| 138 | */ |
| 139 | static int dwc3_otg_set_host(struct usb_otg *otg, struct usb_bus *host) |
| 140 | { |
| 141 | struct dwc3_otg *dotg = container_of(otg, struct dwc3_otg, otg); |
| 142 | |
| 143 | if (host) { |
| 144 | dev_dbg(otg->phy->dev, "%s: set host %s\n", |
| 145 | __func__, host->bus_name); |
| 146 | otg->host = host; |
| 147 | |
| 148 | /* |
| 149 | * Only after both peripheral and host are set then check |
| 150 | * OTG sm. This prevents unnecessary activation of the sm |
| 151 | * in case the ID is high. |
| 152 | */ |
| 153 | if (otg->gadget) |
| 154 | schedule_work(&dotg->sm_work); |
| 155 | } else { |
| 156 | if (otg->phy->state == OTG_STATE_A_HOST) { |
| 157 | dwc3_otg_start_host(otg, 0); |
| 158 | otg->host = NULL; |
| 159 | otg->phy->state = OTG_STATE_UNDEFINED; |
| 160 | schedule_work(&dotg->sm_work); |
| 161 | } else { |
| 162 | otg->host = NULL; |
| 163 | } |
| 164 | } |
| 165 | |
| 166 | return 0; |
| 167 | } |
| 168 | |
| 169 | /** |
| 170 | * dwc3_otg_start_peripheral - bind/unbind the peripheral controller. |
| 171 | * |
| 172 | * @otg: Pointer to the otg_transceiver structure. |
| 173 | * @gadget: pointer to the usb_gadget structure. |
| 174 | * |
| 175 | * Returns 0 on success otherwise negative errno. |
| 176 | */ |
| 177 | static int dwc3_otg_start_peripheral(struct usb_otg *otg, int on) |
| 178 | { |
| 179 | struct dwc3_otg *dotg = container_of(otg, struct dwc3_otg, otg); |
| 180 | |
| 181 | if (!otg->gadget) |
| 182 | return -EINVAL; |
| 183 | |
| 184 | if (on) { |
| 185 | dev_dbg(otg->phy->dev, "%s: turn on gadget %s\n", |
| 186 | __func__, otg->gadget->name); |
| 187 | dwc3_otg_set_peripheral_regs(dotg); |
| 188 | usb_gadget_vbus_connect(otg->gadget); |
| 189 | } else { |
| 190 | dev_dbg(otg->phy->dev, "%s: turn off gadget %s\n", |
| 191 | __func__, otg->gadget->name); |
| 192 | usb_gadget_vbus_disconnect(otg->gadget); |
| 193 | } |
| 194 | |
| 195 | return 0; |
| 196 | } |
| 197 | |
| 198 | /** |
| 199 | * dwc3_otg_set_peripheral - bind/unbind the peripheral controller driver. |
| 200 | * |
| 201 | * @otg: Pointer to the otg_transceiver structure. |
| 202 | * @gadget: pointer to the usb_gadget structure. |
| 203 | * |
| 204 | * Returns 0 on success otherwise negative errno. |
| 205 | */ |
| 206 | static int dwc3_otg_set_peripheral(struct usb_otg *otg, |
| 207 | struct usb_gadget *gadget) |
| 208 | { |
| 209 | struct dwc3_otg *dotg = container_of(otg, struct dwc3_otg, otg); |
| 210 | |
| 211 | if (gadget) { |
| 212 | dev_dbg(otg->phy->dev, "%s: set gadget %s\n", |
| 213 | __func__, gadget->name); |
| 214 | otg->gadget = gadget; |
| 215 | |
| 216 | /* |
| 217 | * Only after both peripheral and host are set then check |
| 218 | * OTG sm. This prevents unnecessary activation of the sm |
| 219 | * in case the ID is grounded. |
| 220 | */ |
| 221 | if (otg->host) |
| 222 | schedule_work(&dotg->sm_work); |
| 223 | } else { |
| 224 | if (otg->phy->state == OTG_STATE_B_PERIPHERAL) { |
| 225 | dwc3_otg_start_peripheral(otg, 0); |
| 226 | otg->gadget = NULL; |
| 227 | otg->phy->state = OTG_STATE_UNDEFINED; |
| 228 | schedule_work(&dotg->sm_work); |
| 229 | } else { |
| 230 | otg->gadget = NULL; |
| 231 | } |
| 232 | } |
| 233 | |
| 234 | return 0; |
| 235 | } |
| 236 | |
| 237 | /** |
Manu Gautam | 8c64281 | 2012-06-07 10:35:10 +0530 | [diff] [blame] | 238 | * dwc3_ext_chg_det_done - callback to handle charger detection completion |
| 239 | * @otg: Pointer to the otg transceiver structure |
| 240 | * @charger: Pointer to the external charger structure |
| 241 | * |
| 242 | * Returns 0 on success |
| 243 | */ |
| 244 | static void dwc3_ext_chg_det_done(struct usb_otg *otg, struct dwc3_charger *chg) |
| 245 | { |
| 246 | struct dwc3_otg *dotg = container_of(otg, struct dwc3_otg, otg); |
| 247 | |
| 248 | /* |
| 249 | * Ignore chg_detection notification if BSV has gone off by this time. |
| 250 | * STOP chg_det as part of !BSV handling would reset the chg_det flags |
| 251 | */ |
| 252 | if (test_bit(B_SESS_VLD, &dotg->inputs)) |
| 253 | schedule_work(&dotg->sm_work); |
| 254 | } |
| 255 | |
| 256 | /** |
| 257 | * dwc3_set_charger - bind/unbind external charger driver |
| 258 | * @otg: Pointer to the otg transceiver structure |
| 259 | * @charger: Pointer to the external charger structure |
| 260 | * |
| 261 | * Returns 0 on success |
| 262 | */ |
| 263 | int dwc3_set_charger(struct usb_otg *otg, struct dwc3_charger *charger) |
| 264 | { |
| 265 | struct dwc3_otg *dotg = container_of(otg, struct dwc3_otg, otg); |
| 266 | |
| 267 | dotg->charger = charger; |
| 268 | if (charger) |
| 269 | charger->notify_detection_complete = dwc3_ext_chg_det_done; |
| 270 | |
| 271 | return 0; |
| 272 | } |
| 273 | |
| 274 | /* IRQs which OTG driver is interested in handling */ |
| 275 | #define DWC3_OEVT_MASK (DWC3_OEVTEN_OTGCONIDSTSCHNGEVNT | \ |
| 276 | DWC3_OEVTEN_OTGBDEVVBUSCHNGEVNT) |
| 277 | |
| 278 | /** |
Ido Shayevitz | cdeef4c | 2012-05-29 13:17:41 +0200 | [diff] [blame] | 279 | * dwc3_otg_interrupt - interrupt handler for dwc3 otg events. |
| 280 | * @_dotg: Pointer to out controller context structure |
| 281 | * |
| 282 | * Returns IRQ_HANDLED on success otherwise IRQ_NONE. |
| 283 | */ |
| 284 | static irqreturn_t dwc3_otg_interrupt(int irq, void *_dotg) |
| 285 | { |
| 286 | struct dwc3_otg *dotg = (struct dwc3_otg *)_dotg; |
Manu Gautam | 8c64281 | 2012-06-07 10:35:10 +0530 | [diff] [blame] | 287 | u32 osts, oevt_reg; |
Ido Shayevitz | cdeef4c | 2012-05-29 13:17:41 +0200 | [diff] [blame] | 288 | int ret = IRQ_NONE; |
| 289 | int handled_irqs = 0; |
| 290 | |
| 291 | oevt_reg = dwc3_readl(dotg->regs, DWC3_OEVT); |
| 292 | |
Manu Gautam | 8c64281 | 2012-06-07 10:35:10 +0530 | [diff] [blame] | 293 | if (!(oevt_reg & DWC3_OEVT_MASK)) |
| 294 | return IRQ_NONE; |
| 295 | |
| 296 | osts = dwc3_readl(dotg->regs, DWC3_OSTS); |
| 297 | |
| 298 | if ((oevt_reg & DWC3_OEVTEN_OTGCONIDSTSCHNGEVNT) || |
| 299 | (oevt_reg & DWC3_OEVTEN_OTGBDEVVBUSCHNGEVNT)) { |
Ido Shayevitz | cdeef4c | 2012-05-29 13:17:41 +0200 | [diff] [blame] | 300 | /* |
Manu Gautam | 8c64281 | 2012-06-07 10:35:10 +0530 | [diff] [blame] | 301 | * ID sts has changed, set inputs later, in the workqueue |
Ido Shayevitz | cdeef4c | 2012-05-29 13:17:41 +0200 | [diff] [blame] | 302 | * function, switch from A to B or from B to A. |
| 303 | */ |
Ido Shayevitz | cdeef4c | 2012-05-29 13:17:41 +0200 | [diff] [blame] | 304 | |
Manu Gautam | 8c64281 | 2012-06-07 10:35:10 +0530 | [diff] [blame] | 305 | if (osts & DWC3_OTG_OSTS_CONIDSTS) |
| 306 | set_bit(ID, &dotg->inputs); |
| 307 | else |
| 308 | clear_bit(ID, &dotg->inputs); |
| 309 | |
| 310 | if (osts & DWC3_OTG_OSTS_BSESVALID) |
| 311 | set_bit(B_SESS_VLD, &dotg->inputs); |
| 312 | else |
| 313 | clear_bit(B_SESS_VLD, &dotg->inputs); |
| 314 | |
Ido Shayevitz | cdeef4c | 2012-05-29 13:17:41 +0200 | [diff] [blame] | 315 | schedule_work(&dotg->sm_work); |
| 316 | |
Manu Gautam | 8c64281 | 2012-06-07 10:35:10 +0530 | [diff] [blame] | 317 | handled_irqs |= (oevt_reg & DWC3_OEVTEN_OTGCONIDSTSCHNGEVNT) ? |
| 318 | DWC3_OEVTEN_OTGCONIDSTSCHNGEVNT : 0; |
| 319 | handled_irqs |= (oevt_reg & DWC3_OEVTEN_OTGBDEVVBUSCHNGEVNT) ? |
| 320 | DWC3_OEVTEN_OTGBDEVVBUSCHNGEVNT : 0; |
| 321 | |
Ido Shayevitz | cdeef4c | 2012-05-29 13:17:41 +0200 | [diff] [blame] | 322 | ret = IRQ_HANDLED; |
Manu Gautam | 8c64281 | 2012-06-07 10:35:10 +0530 | [diff] [blame] | 323 | |
| 324 | /* Clear the interrupts we handled */ |
| 325 | dwc3_writel(dotg->regs, DWC3_OEVT, handled_irqs); |
Ido Shayevitz | cdeef4c | 2012-05-29 13:17:41 +0200 | [diff] [blame] | 326 | } |
| 327 | |
Ido Shayevitz | cdeef4c | 2012-05-29 13:17:41 +0200 | [diff] [blame] | 328 | return ret; |
| 329 | } |
| 330 | |
| 331 | /** |
Manu Gautam | 8c64281 | 2012-06-07 10:35:10 +0530 | [diff] [blame] | 332 | * dwc3_otg_init_sm - initialize OTG statemachine input |
| 333 | * @dotg: Pointer to the dwc3_otg structure |
| 334 | * |
| 335 | */ |
| 336 | void dwc3_otg_init_sm(struct dwc3_otg *dotg) |
| 337 | { |
| 338 | u32 osts = dwc3_readl(dotg->regs, DWC3_OSTS); |
| 339 | struct usb_phy *phy = dotg->otg.phy; |
| 340 | |
| 341 | /* |
| 342 | * TODO: If using external notifications then wait here till initial |
| 343 | * state is reported |
| 344 | */ |
| 345 | |
| 346 | dev_dbg(phy->dev, "Initialize OTG inputs, osts: 0x%x\n", osts); |
| 347 | |
| 348 | if (osts & DWC3_OTG_OSTS_CONIDSTS) |
| 349 | set_bit(ID, &dotg->inputs); |
| 350 | else |
| 351 | clear_bit(ID, &dotg->inputs); |
| 352 | |
| 353 | if (osts & DWC3_OTG_OSTS_BSESVALID) |
| 354 | set_bit(B_SESS_VLD, &dotg->inputs); |
| 355 | else |
| 356 | clear_bit(B_SESS_VLD, &dotg->inputs); |
| 357 | } |
| 358 | |
| 359 | /** |
Ido Shayevitz | cdeef4c | 2012-05-29 13:17:41 +0200 | [diff] [blame] | 360 | * dwc3_otg_sm_work - workqueue function. |
| 361 | * |
| 362 | * @w: Pointer to the dwc3 otg workqueue |
| 363 | * |
| 364 | * NOTE: After any change in phy->state, |
| 365 | * we must reschdule the state machine. |
| 366 | */ |
| 367 | static void dwc3_otg_sm_work(struct work_struct *w) |
| 368 | { |
| 369 | struct dwc3_otg *dotg = container_of(w, struct dwc3_otg, sm_work); |
| 370 | struct usb_phy *phy = dotg->otg.phy; |
Manu Gautam | 8c64281 | 2012-06-07 10:35:10 +0530 | [diff] [blame] | 371 | struct dwc3_charger *charger = dotg->charger; |
| 372 | bool work = 0; |
Ido Shayevitz | cdeef4c | 2012-05-29 13:17:41 +0200 | [diff] [blame] | 373 | |
| 374 | dev_dbg(phy->dev, "%s state\n", otg_state_string(phy->state)); |
| 375 | |
| 376 | /* Check OTG state */ |
| 377 | switch (phy->state) { |
| 378 | case OTG_STATE_UNDEFINED: |
Manu Gautam | 8c64281 | 2012-06-07 10:35:10 +0530 | [diff] [blame] | 379 | dwc3_otg_init_sm(dotg); |
| 380 | /* Switch to A or B-Device according to ID / BSV */ |
| 381 | if (!test_bit(ID, &dotg->inputs) && phy->otg->host) { |
| 382 | dev_dbg(phy->dev, "!id\n"); |
| 383 | phy->state = OTG_STATE_A_IDLE; |
| 384 | work = 1; |
| 385 | } else if (test_bit(B_SESS_VLD, &dotg->inputs)) { |
| 386 | dev_dbg(phy->dev, "b_sess_vld\n"); |
Ido Shayevitz | cdeef4c | 2012-05-29 13:17:41 +0200 | [diff] [blame] | 387 | phy->state = OTG_STATE_B_IDLE; |
Manu Gautam | 8c64281 | 2012-06-07 10:35:10 +0530 | [diff] [blame] | 388 | work = 1; |
| 389 | } else { |
| 390 | phy->state = OTG_STATE_B_IDLE; |
| 391 | /* TODO: Enter low power state */ |
Ido Shayevitz | cdeef4c | 2012-05-29 13:17:41 +0200 | [diff] [blame] | 392 | } |
| 393 | break; |
Manu Gautam | 8c64281 | 2012-06-07 10:35:10 +0530 | [diff] [blame] | 394 | |
| 395 | case OTG_STATE_B_IDLE: |
| 396 | if (!test_bit(ID, &dotg->inputs) && phy->otg->host) { |
| 397 | dev_dbg(phy->dev, "!id\n"); |
| 398 | phy->state = OTG_STATE_A_IDLE; |
| 399 | work = 1; |
| 400 | if (charger) { |
| 401 | if (charger->chg_type == DWC3_INVALID_CHARGER) |
| 402 | charger->start_detection(dotg->charger, |
| 403 | false); |
| 404 | else |
| 405 | charger->chg_type = |
| 406 | DWC3_INVALID_CHARGER; |
| 407 | } |
| 408 | } else if (test_bit(B_SESS_VLD, &dotg->inputs)) { |
| 409 | dev_dbg(phy->dev, "b_sess_vld\n"); |
| 410 | if (charger) { |
| 411 | /* Has charger been detected? If no detect it */ |
| 412 | switch (charger->chg_type) { |
| 413 | case DWC3_DCP_CHARGER: |
| 414 | /* TODO: initiate LPM */ |
| 415 | break; |
| 416 | case DWC3_CDP_CHARGER: |
| 417 | dwc3_otg_start_peripheral(&dotg->otg, |
| 418 | 1); |
| 419 | phy->state = OTG_STATE_B_PERIPHERAL; |
| 420 | work = 1; |
| 421 | break; |
| 422 | case DWC3_SDP_CHARGER: |
| 423 | dwc3_otg_start_peripheral(&dotg->otg, |
| 424 | 1); |
| 425 | phy->state = OTG_STATE_B_PERIPHERAL; |
| 426 | work = 1; |
| 427 | break; |
| 428 | default: |
| 429 | dev_dbg(phy->dev, "chg_det started\n"); |
| 430 | charger->start_detection(charger, true); |
| 431 | break; |
| 432 | } |
| 433 | } else { |
| 434 | /* no charger registered, start peripheral */ |
| 435 | if (dwc3_otg_start_peripheral(&dotg->otg, 1)) { |
| 436 | /* |
| 437 | * Probably set_peripheral not called |
| 438 | * yet. We will re-try as soon as it |
| 439 | * will be called |
| 440 | */ |
| 441 | dev_err(phy->dev, |
| 442 | "unable to start B-device\n"); |
| 443 | phy->state = OTG_STATE_UNDEFINED; |
| 444 | return; |
| 445 | } |
| 446 | } |
| 447 | } else { |
| 448 | if (charger) { |
| 449 | if (charger->chg_type == DWC3_INVALID_CHARGER) |
| 450 | charger->start_detection(dotg->charger, |
| 451 | false); |
| 452 | else |
| 453 | charger->chg_type = |
| 454 | DWC3_INVALID_CHARGER; |
| 455 | } |
| 456 | /* TODO: Enter low power state */ |
| 457 | } |
| 458 | break; |
| 459 | |
| 460 | case OTG_STATE_B_PERIPHERAL: |
| 461 | if (!test_bit(B_SESS_VLD, &dotg->inputs) || |
| 462 | !test_bit(ID, &dotg->inputs)) { |
| 463 | dev_dbg(phy->dev, "!id || !bsv\n"); |
| 464 | dwc3_otg_start_peripheral(&dotg->otg, 0); |
| 465 | phy->state = OTG_STATE_B_IDLE; |
| 466 | if (charger) |
| 467 | charger->chg_type = DWC3_INVALID_CHARGER; |
| 468 | work = 1; |
| 469 | } |
| 470 | break; |
| 471 | |
Ido Shayevitz | cdeef4c | 2012-05-29 13:17:41 +0200 | [diff] [blame] | 472 | case OTG_STATE_A_IDLE: |
| 473 | /* Switch to A-Device*/ |
Manu Gautam | 8c64281 | 2012-06-07 10:35:10 +0530 | [diff] [blame] | 474 | if (test_bit(ID, &dotg->inputs)) { |
| 475 | dev_dbg(phy->dev, "id\n"); |
Ido Shayevitz | cdeef4c | 2012-05-29 13:17:41 +0200 | [diff] [blame] | 476 | phy->state = OTG_STATE_B_IDLE; |
Manu Gautam | 8c64281 | 2012-06-07 10:35:10 +0530 | [diff] [blame] | 477 | work = 1; |
| 478 | } else { |
| 479 | if (dwc3_otg_start_host(&dotg->otg, 1)) { |
| 480 | /* |
| 481 | * Probably set_host was not called yet. |
| 482 | * We will re-try as soon as it will be called |
| 483 | */ |
| 484 | dev_dbg(phy->dev, |
| 485 | "unable to start A-device\n"); |
| 486 | phy->state = OTG_STATE_UNDEFINED; |
| 487 | return; |
| 488 | } |
| 489 | phy->state = OTG_STATE_A_HOST; |
Ido Shayevitz | cdeef4c | 2012-05-29 13:17:41 +0200 | [diff] [blame] | 490 | } |
| 491 | break; |
Manu Gautam | 8c64281 | 2012-06-07 10:35:10 +0530 | [diff] [blame] | 492 | |
| 493 | case OTG_STATE_A_HOST: |
| 494 | if (test_bit(ID, &dotg->inputs)) { |
| 495 | dev_dbg(phy->dev, "id\n"); |
| 496 | dwc3_otg_start_host(&dotg->otg, 0); |
| 497 | phy->state = OTG_STATE_B_IDLE; |
| 498 | work = 1; |
| 499 | } |
| 500 | break; |
| 501 | |
Ido Shayevitz | cdeef4c | 2012-05-29 13:17:41 +0200 | [diff] [blame] | 502 | default: |
| 503 | dev_err(phy->dev, "%s: invalid otg-state\n", __func__); |
| 504 | |
| 505 | } |
Manu Gautam | 8c64281 | 2012-06-07 10:35:10 +0530 | [diff] [blame] | 506 | |
| 507 | if (work) |
| 508 | schedule_work(&dotg->sm_work); |
Ido Shayevitz | cdeef4c | 2012-05-29 13:17:41 +0200 | [diff] [blame] | 509 | } |
| 510 | |
| 511 | |
| 512 | /** |
| 513 | * dwc3_otg_reset - reset dwc3 otg registers. |
| 514 | * |
| 515 | * @w: Pointer to the dwc3 otg workqueue |
| 516 | */ |
| 517 | static void dwc3_otg_reset(struct dwc3_otg *dotg) |
| 518 | { |
| 519 | /* |
| 520 | * OCFG[2] - OTG-Version = 1 |
| 521 | * OCFG[1] - HNPCap = 0 |
| 522 | * OCFG[0] - SRPCap = 0 |
| 523 | */ |
| 524 | dwc3_writel(dotg->regs, DWC3_OCFG, 0x4); |
| 525 | |
| 526 | /* |
| 527 | * OCTL[6] - PeriMode = 1 |
| 528 | * OCTL[5] - PrtPwrCtl = 0 |
| 529 | * OCTL[4] - HNPReq = 0 |
| 530 | * OCTL[3] - SesReq = 0 |
| 531 | * OCTL[2] - TermSelDLPulse = 0 |
| 532 | * OCTL[1] - DevSetHNPEn = 0 |
| 533 | * OCTL[0] - HstSetHNPEn = 0 |
| 534 | */ |
| 535 | dwc3_writel(dotg->regs, DWC3_OCTL, 0x40); |
| 536 | |
| 537 | /* Clear all otg events (interrupts) indications */ |
| 538 | dwc3_writel(dotg->regs, DWC3_OEVT, 0xFFFF); |
| 539 | |
Manu Gautam | 8c64281 | 2012-06-07 10:35:10 +0530 | [diff] [blame] | 540 | /* Enable ID/BSV StsChngEn event*/ |
Ido Shayevitz | cdeef4c | 2012-05-29 13:17:41 +0200 | [diff] [blame] | 541 | dwc3_writel(dotg->regs, DWC3_OEVTEN, |
Manu Gautam | 8c64281 | 2012-06-07 10:35:10 +0530 | [diff] [blame] | 542 | DWC3_OEVTEN_OTGCONIDSTSCHNGEVNT | |
| 543 | DWC3_OEVTEN_OTGBDEVVBUSCHNGEVNT); |
Ido Shayevitz | cdeef4c | 2012-05-29 13:17:41 +0200 | [diff] [blame] | 544 | } |
| 545 | |
| 546 | /** |
| 547 | * dwc3_otg_init - Initializes otg related registers |
| 548 | * @dwc: Pointer to out controller context structure |
| 549 | * |
| 550 | * Returns 0 on success otherwise negative errno. |
| 551 | */ |
| 552 | int dwc3_otg_init(struct dwc3 *dwc) |
| 553 | { |
| 554 | u32 reg; |
| 555 | int ret = 0; |
| 556 | struct dwc3_otg *dotg; |
| 557 | |
| 558 | dev_dbg(dwc->dev, "dwc3_otg_init\n"); |
| 559 | |
| 560 | /* |
| 561 | * GHWPARAMS6[10] bit is SRPSupport. |
| 562 | * This bit also reflects DWC_USB3_EN_OTG |
| 563 | */ |
| 564 | reg = dwc3_readl(dwc->regs, DWC3_GHWPARAMS6); |
| 565 | if (!(reg & DWC3_GHWPARAMS6_SRP_SUPPORT)) { |
| 566 | /* |
| 567 | * No OTG support in the HW core. |
| 568 | * We return 0 to indicate no error, since this is acceptable |
| 569 | * situation, just continue probe the dwc3 driver without otg. |
| 570 | */ |
| 571 | dev_dbg(dwc->dev, "dwc3_otg address space is not supported\n"); |
| 572 | return 0; |
| 573 | } |
| 574 | |
| 575 | /* Allocate and init otg instance */ |
| 576 | dotg = kzalloc(sizeof(struct dwc3_otg), GFP_KERNEL); |
| 577 | if (!dotg) { |
| 578 | dev_err(dwc->dev, "unable to allocate dwc3_otg\n"); |
| 579 | return -ENOMEM; |
| 580 | } |
| 581 | |
Manu Gautam | 17206c2 | 2012-06-21 10:17:53 +0530 | [diff] [blame] | 582 | /* DWC3 has separate IRQ line for OTG events (ID/BSV etc.) */ |
| 583 | dotg->irq = platform_get_irq_byname(to_platform_device(dwc->dev), |
| 584 | "otg_irq"); |
Ido Shayevitz | cdeef4c | 2012-05-29 13:17:41 +0200 | [diff] [blame] | 585 | if (dotg->irq < 0) { |
Manu Gautam | 17206c2 | 2012-06-21 10:17:53 +0530 | [diff] [blame] | 586 | dev_err(dwc->dev, "%s: missing OTG IRQ\n", __func__); |
Ido Shayevitz | cdeef4c | 2012-05-29 13:17:41 +0200 | [diff] [blame] | 587 | ret = -ENODEV; |
| 588 | goto err1; |
| 589 | } |
| 590 | |
| 591 | dotg->regs = dwc->regs; |
| 592 | |
| 593 | dotg->otg.set_peripheral = dwc3_otg_set_peripheral; |
| 594 | dotg->otg.set_host = dwc3_otg_set_host; |
| 595 | |
| 596 | /* This reference is used by dwc3 modules for checking otg existance */ |
| 597 | dwc->dotg = dotg; |
| 598 | |
| 599 | dotg->otg.phy = kzalloc(sizeof(struct usb_phy), GFP_KERNEL); |
| 600 | if (!dotg->otg.phy) { |
| 601 | dev_err(dwc->dev, "unable to allocate dwc3_otg.phy\n"); |
| 602 | ret = -ENOMEM; |
| 603 | goto err1; |
| 604 | } |
| 605 | |
| 606 | dotg->otg.phy->otg = &dotg->otg; |
| 607 | dotg->otg.phy->dev = dwc->dev; |
| 608 | |
| 609 | ret = usb_set_transceiver(dotg->otg.phy); |
| 610 | if (ret) { |
| 611 | dev_err(dotg->otg.phy->dev, |
| 612 | "%s: failed to set transceiver, already exists\n", |
| 613 | __func__); |
| 614 | goto err2; |
| 615 | } |
| 616 | |
| 617 | dwc3_otg_reset(dotg); |
| 618 | |
| 619 | dotg->otg.phy->state = OTG_STATE_UNDEFINED; |
| 620 | |
| 621 | INIT_WORK(&dotg->sm_work, dwc3_otg_sm_work); |
| 622 | |
| 623 | ret = request_irq(dotg->irq, dwc3_otg_interrupt, IRQF_SHARED, |
| 624 | "dwc3_otg", dotg); |
| 625 | if (ret) { |
| 626 | dev_err(dotg->otg.phy->dev, "failed to request irq #%d --> %d\n", |
| 627 | dotg->irq, ret); |
| 628 | goto err3; |
| 629 | } |
| 630 | |
| 631 | return 0; |
| 632 | |
| 633 | err3: |
| 634 | cancel_work_sync(&dotg->sm_work); |
| 635 | usb_set_transceiver(NULL); |
| 636 | err2: |
| 637 | kfree(dotg->otg.phy); |
| 638 | err1: |
| 639 | dwc->dotg = NULL; |
| 640 | kfree(dotg); |
| 641 | |
| 642 | return ret; |
| 643 | } |
| 644 | |
| 645 | /** |
| 646 | * dwc3_otg_exit |
| 647 | * @dwc: Pointer to out controller context structure |
| 648 | * |
| 649 | * Returns 0 on success otherwise negative errno. |
| 650 | */ |
| 651 | void dwc3_otg_exit(struct dwc3 *dwc) |
| 652 | { |
| 653 | struct dwc3_otg *dotg = dwc->dotg; |
| 654 | |
| 655 | /* dotg is null when GHWPARAMS6[10]=SRPSupport=0, see dwc3_otg_init */ |
| 656 | if (dotg) { |
Manu Gautam | 8c64281 | 2012-06-07 10:35:10 +0530 | [diff] [blame] | 657 | if (dotg->charger) |
| 658 | dotg->charger->start_detection(dotg->charger, false); |
Ido Shayevitz | cdeef4c | 2012-05-29 13:17:41 +0200 | [diff] [blame] | 659 | cancel_work_sync(&dotg->sm_work); |
| 660 | usb_set_transceiver(NULL); |
| 661 | free_irq(dotg->irq, dotg); |
| 662 | kfree(dotg->otg.phy); |
| 663 | kfree(dotg); |
| 664 | dwc->dotg = NULL; |
| 665 | } |
| 666 | } |