1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2005-2007 by Texas Instruments 4 * Some code has been taken from tusb6010.c 5 * Copyrights for that are attributable to: 6 * Copyright (C) 2006 Nokia Corporation 7 * Tony Lindgren <tony@atomide.com> 8 * 9 * This file is part of the Inventra Controller Driver for Linux. 10 */ 11 #include <linux/module.h> 12 #include <linux/kernel.h> 13 #include <linux/sched.h> 14 #include <linux/init.h> 15 #include <linux/list.h> 16 #include <linux/io.h> 17 #include <linux/of.h> 18 #include <linux/platform_device.h> 19 #include <linux/dma-mapping.h> 20 #include <linux/pm_runtime.h> 21 #include <linux/err.h> 22 #include <linux/delay.h> 23 #include <linux/usb/musb.h> 24 #include <linux/phy/omap_control_phy.h> 25 #include <linux/of_platform.h> 26 27 #include "musb_core.h" 28 #include "omap2430.h" 29 30 struct omap2430_glue { 31 struct device *dev; 32 struct platform_device *musb; 33 enum musb_vbus_id_status status; 34 struct work_struct omap_musb_mailbox_work; 35 struct device *control_otghs; 36 unsigned int is_runtime_suspended:1; 37 unsigned int needs_resume:1; 38 unsigned int phy_suspended:1; 39 }; 40 #define glue_to_musb(g) platform_get_drvdata(g->musb) 41 42 static struct omap2430_glue *_glue; 43 44 static inline void omap2430_low_level_exit(struct musb *musb) 45 { 46 u32 l; 47 48 /* in any role */ 49 l = musb_readl(musb->mregs, OTG_FORCESTDBY); 50 l |= ENABLEFORCE; /* enable MSTANDBY */ 51 musb_writel(musb->mregs, OTG_FORCESTDBY, l); 52 } 53 54 static inline void omap2430_low_level_init(struct musb *musb) 55 { 56 u32 l; 57 58 l = musb_readl(musb->mregs, OTG_FORCESTDBY); 59 l &= ~ENABLEFORCE; /* disable MSTANDBY */ 60 musb_writel(musb->mregs, OTG_FORCESTDBY, l); 61 } 62 63 static int omap2430_musb_mailbox(enum musb_vbus_id_status status) 64 { 65 struct omap2430_glue *glue = _glue; 66 67 if (!glue) { 68 pr_err("%s: musb core is not yet initialized\n", __func__); 69 return -EPROBE_DEFER; 70 } 71 glue->status = status; 72 73 if (!glue_to_musb(glue)) { 74 pr_err("%s: musb core is not yet ready\n", __func__); 75 return -EPROBE_DEFER; 76 } 77 78 schedule_work(&glue->omap_musb_mailbox_work); 79 80 return 0; 81 } 82 83 /* 84 * HDRC controls CPEN, but beware current surges during device connect. 85 * They can trigger transient overcurrent conditions that must be ignored. 86 * 87 * Note that we're skipping A_WAIT_VFALL -> A_IDLE and jumping right to B_IDLE 88 * as set by musb_set_peripheral(). 89 */ 90 static void omap_musb_set_mailbox(struct omap2430_glue *glue) 91 { 92 struct musb *musb = glue_to_musb(glue); 93 int error; 94 95 pm_runtime_get_sync(musb->controller); 96 97 dev_dbg(musb->controller, "VBUS %s, devctl %02x\n", 98 usb_otg_state_string(musb->xceiv->otg->state), 99 musb_readb(musb->mregs, MUSB_DEVCTL)); 100 101 switch (glue->status) { 102 case MUSB_ID_GROUND: 103 dev_dbg(musb->controller, "ID GND\n"); 104 switch (musb->xceiv->otg->state) { 105 case OTG_STATE_A_IDLE: 106 error = musb_set_host(musb); 107 if (error) 108 break; 109 musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE; 110 fallthrough; 111 case OTG_STATE_A_WAIT_VRISE: 112 case OTG_STATE_A_WAIT_BCON: 113 case OTG_STATE_A_HOST: 114 /* 115 * On multiple ID ground interrupts just keep enabling 116 * VBUS. At least cpcap VBUS shuts down otherwise. 117 */ 118 otg_set_vbus(musb->xceiv->otg, 1); 119 break; 120 default: 121 musb->xceiv->otg->state = OTG_STATE_A_IDLE; 122 musb->xceiv->last_event = USB_EVENT_ID; 123 if (musb->gadget_driver) { 124 omap_control_usb_set_mode(glue->control_otghs, 125 USB_MODE_HOST); 126 otg_set_vbus(musb->xceiv->otg, 1); 127 } 128 break; 129 } 130 break; 131 132 case MUSB_VBUS_VALID: 133 dev_dbg(musb->controller, "VBUS Connect\n"); 134 135 musb->xceiv->otg->state = OTG_STATE_B_IDLE; 136 musb->xceiv->last_event = USB_EVENT_VBUS; 137 omap_control_usb_set_mode(glue->control_otghs, USB_MODE_DEVICE); 138 break; 139 140 case MUSB_ID_FLOAT: 141 case MUSB_VBUS_OFF: 142 dev_dbg(musb->controller, "VBUS Disconnect\n"); 143 144 musb->xceiv->last_event = USB_EVENT_NONE; 145 musb_set_peripheral(musb); 146 otg_set_vbus(musb->xceiv->otg, 0); 147 omap_control_usb_set_mode(glue->control_otghs, 148 USB_MODE_DISCONNECT); 149 break; 150 default: 151 dev_dbg(musb->controller, "ID float\n"); 152 } 153 pm_runtime_mark_last_busy(musb->controller); 154 pm_runtime_put_autosuspend(musb->controller); 155 atomic_notifier_call_chain(&musb->xceiv->notifier, 156 musb->xceiv->last_event, NULL); 157 } 158 159 160 static void omap_musb_mailbox_work(struct work_struct *mailbox_work) 161 { 162 struct omap2430_glue *glue = container_of(mailbox_work, 163 struct omap2430_glue, omap_musb_mailbox_work); 164 165 omap_musb_set_mailbox(glue); 166 } 167 168 static irqreturn_t omap2430_musb_interrupt(int irq, void *__hci) 169 { 170 unsigned long flags; 171 irqreturn_t retval = IRQ_NONE; 172 struct musb *musb = __hci; 173 174 spin_lock_irqsave(&musb->lock, flags); 175 176 musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB); 177 musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX); 178 musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX); 179 180 if (musb->int_usb || musb->int_tx || musb->int_rx) 181 retval = musb_interrupt(musb); 182 183 spin_unlock_irqrestore(&musb->lock, flags); 184 185 return retval; 186 } 187 188 static int omap2430_musb_init(struct musb *musb) 189 { 190 u32 l; 191 int status = 0; 192 struct device *dev = musb->controller; 193 struct musb_hdrc_platform_data *plat = dev_get_platdata(dev); 194 struct omap_musb_board_data *data = plat->board_data; 195 196 /* We require some kind of external transceiver, hooked 197 * up through ULPI. TWL4030-family PMICs include one, 198 * which needs a driver, drivers aren't always needed. 199 */ 200 musb->phy = devm_phy_get(dev->parent, "usb2-phy"); 201 202 /* We can't totally remove musb->xceiv as of now because 203 * musb core uses xceiv.state and xceiv.otg. Once we have 204 * a separate state machine to handle otg, these can be moved 205 * out of xceiv and then we can start using the generic PHY 206 * framework 207 */ 208 musb->xceiv = devm_usb_get_phy_by_phandle(dev->parent, "usb-phy", 0); 209 210 if (IS_ERR(musb->xceiv)) { 211 status = PTR_ERR(musb->xceiv); 212 213 if (status == -ENXIO) 214 return status; 215 216 dev_dbg(dev, "HS USB OTG: no transceiver configured\n"); 217 return -EPROBE_DEFER; 218 } 219 220 if (IS_ERR(musb->phy)) { 221 dev_err(dev, "HS USB OTG: no PHY configured\n"); 222 return PTR_ERR(musb->phy); 223 } 224 musb->isr = omap2430_musb_interrupt; 225 phy_init(musb->phy); 226 phy_power_on(musb->phy); 227 228 l = musb_readl(musb->mregs, OTG_INTERFSEL); 229 230 if (data->interface_type == MUSB_INTERFACE_UTMI) { 231 /* OMAP4 uses Internal PHY GS70 which uses UTMI interface */ 232 l &= ~ULPI_12PIN; /* Disable ULPI */ 233 l |= UTMI_8BIT; /* Enable UTMI */ 234 } else { 235 l |= ULPI_12PIN; 236 } 237 238 musb_writel(musb->mregs, OTG_INTERFSEL, l); 239 240 dev_dbg(dev, "HS USB OTG: revision 0x%x, sysconfig 0x%02x, " 241 "sysstatus 0x%x, intrfsel 0x%x, simenable 0x%x\n", 242 musb_readl(musb->mregs, OTG_REVISION), 243 musb_readl(musb->mregs, OTG_SYSCONFIG), 244 musb_readl(musb->mregs, OTG_SYSSTATUS), 245 musb_readl(musb->mregs, OTG_INTERFSEL), 246 musb_readl(musb->mregs, OTG_SIMENABLE)); 247 248 return 0; 249 } 250 251 static void omap2430_musb_enable(struct musb *musb) 252 { 253 struct device *dev = musb->controller; 254 struct omap2430_glue *glue = dev_get_drvdata(dev->parent); 255 256 if (glue->status == MUSB_UNKNOWN) 257 glue->status = MUSB_VBUS_OFF; 258 omap_musb_set_mailbox(glue); 259 } 260 261 static void omap2430_musb_disable(struct musb *musb) 262 { 263 struct device *dev = musb->controller; 264 struct omap2430_glue *glue = dev_get_drvdata(dev->parent); 265 266 if (glue->status != MUSB_UNKNOWN) 267 omap_control_usb_set_mode(glue->control_otghs, 268 USB_MODE_DISCONNECT); 269 } 270 271 static int omap2430_musb_exit(struct musb *musb) 272 { 273 struct device *dev = musb->controller; 274 struct omap2430_glue *glue = dev_get_drvdata(dev->parent); 275 276 omap2430_low_level_exit(musb); 277 phy_power_off(musb->phy); 278 phy_exit(musb->phy); 279 musb->phy = NULL; 280 cancel_work_sync(&glue->omap_musb_mailbox_work); 281 282 return 0; 283 } 284 285 static const struct musb_platform_ops omap2430_ops = { 286 .quirks = MUSB_DMA_INVENTRA, 287 #ifdef CONFIG_USB_INVENTRA_DMA 288 .dma_init = musbhs_dma_controller_create, 289 .dma_exit = musbhs_dma_controller_destroy, 290 #endif 291 .init = omap2430_musb_init, 292 .exit = omap2430_musb_exit, 293 294 .enable = omap2430_musb_enable, 295 .disable = omap2430_musb_disable, 296 297 .phy_callback = omap2430_musb_mailbox, 298 }; 299 300 static u64 omap2430_dmamask = DMA_BIT_MASK(32); 301 302 static int omap2430_probe(struct platform_device *pdev) 303 { 304 struct musb_hdrc_platform_data *pdata = dev_get_platdata(&pdev->dev); 305 struct omap_musb_board_data *data; 306 struct platform_device *musb; 307 struct omap2430_glue *glue; 308 struct device_node *np = pdev->dev.of_node; 309 struct musb_hdrc_config *config; 310 struct device_node *control_node; 311 struct platform_device *control_pdev; 312 int ret = -ENOMEM, val; 313 314 if (!np) 315 return -ENODEV; 316 317 glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL); 318 if (!glue) 319 goto err0; 320 321 musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO); 322 if (!musb) { 323 dev_err(&pdev->dev, "failed to allocate musb device\n"); 324 goto err0; 325 } 326 327 musb->dev.parent = &pdev->dev; 328 musb->dev.dma_mask = &omap2430_dmamask; 329 musb->dev.coherent_dma_mask = omap2430_dmamask; 330 331 glue->dev = &pdev->dev; 332 glue->musb = musb; 333 glue->status = MUSB_UNKNOWN; 334 glue->control_otghs = ERR_PTR(-ENODEV); 335 336 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); 337 if (!pdata) 338 goto err2; 339 340 data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); 341 if (!data) 342 goto err2; 343 344 config = devm_kzalloc(&pdev->dev, sizeof(*config), GFP_KERNEL); 345 if (!config) 346 goto err2; 347 348 of_property_read_u32(np, "mode", (u32 *)&pdata->mode); 349 of_property_read_u32(np, "interface-type", 350 (u32 *)&data->interface_type); 351 of_property_read_u32(np, "num-eps", (u32 *)&config->num_eps); 352 of_property_read_u32(np, "ram-bits", (u32 *)&config->ram_bits); 353 of_property_read_u32(np, "power", (u32 *)&pdata->power); 354 355 ret = of_property_read_u32(np, "multipoint", &val); 356 if (!ret && val) 357 config->multipoint = true; 358 359 pdata->board_data = data; 360 pdata->config = config; 361 362 control_node = of_parse_phandle(np, "ctrl-module", 0); 363 if (control_node) { 364 control_pdev = of_find_device_by_node(control_node); 365 if (!control_pdev) { 366 dev_err(&pdev->dev, "Failed to get control device\n"); 367 ret = -EINVAL; 368 goto err2; 369 } 370 glue->control_otghs = &control_pdev->dev; 371 } 372 373 pdata->platform_ops = &omap2430_ops; 374 375 platform_set_drvdata(pdev, glue); 376 377 /* 378 * REVISIT if we ever have two instances of the wrapper, we will be 379 * in big trouble 380 */ 381 _glue = glue; 382 383 INIT_WORK(&glue->omap_musb_mailbox_work, omap_musb_mailbox_work); 384 385 ret = platform_device_add_resources(musb, pdev->resource, pdev->num_resources); 386 if (ret) { 387 dev_err(&pdev->dev, "failed to add resources\n"); 388 goto err2; 389 } 390 391 ret = platform_device_add_data(musb, pdata, sizeof(*pdata)); 392 if (ret) { 393 dev_err(&pdev->dev, "failed to add platform_data\n"); 394 goto err2; 395 } 396 397 pm_runtime_enable(glue->dev); 398 399 ret = platform_device_add(musb); 400 if (ret) { 401 dev_err(&pdev->dev, "failed to register musb device\n"); 402 goto err3; 403 } 404 405 return 0; 406 407 err3: 408 pm_runtime_disable(glue->dev); 409 410 err2: 411 platform_device_put(musb); 412 413 err0: 414 return ret; 415 } 416 417 static int omap2430_remove(struct platform_device *pdev) 418 { 419 struct omap2430_glue *glue = platform_get_drvdata(pdev); 420 421 platform_device_unregister(glue->musb); 422 pm_runtime_disable(glue->dev); 423 424 return 0; 425 } 426 427 #ifdef CONFIG_PM 428 429 static int omap2430_runtime_suspend(struct device *dev) 430 { 431 struct omap2430_glue *glue = dev_get_drvdata(dev); 432 struct musb *musb = glue_to_musb(glue); 433 434 if (!musb) 435 return 0; 436 437 musb->context.otg_interfsel = musb_readl(musb->mregs, 438 OTG_INTERFSEL); 439 440 omap2430_low_level_exit(musb); 441 442 if (!glue->phy_suspended) { 443 phy_power_off(musb->phy); 444 phy_exit(musb->phy); 445 } 446 447 glue->is_runtime_suspended = 1; 448 449 return 0; 450 } 451 452 static int omap2430_runtime_resume(struct device *dev) 453 { 454 struct omap2430_glue *glue = dev_get_drvdata(dev); 455 struct musb *musb = glue_to_musb(glue); 456 457 if (!musb) 458 return 0; 459 460 if (!glue->phy_suspended) { 461 phy_init(musb->phy); 462 phy_power_on(musb->phy); 463 } 464 465 omap2430_low_level_init(musb); 466 musb_writel(musb->mregs, OTG_INTERFSEL, 467 musb->context.otg_interfsel); 468 469 /* Wait for musb to get oriented. Otherwise we can get babble */ 470 usleep_range(200000, 250000); 471 472 glue->is_runtime_suspended = 0; 473 474 return 0; 475 } 476 477 /* I2C and SPI PHYs need to be suspended before the glue layer */ 478 static int omap2430_suspend(struct device *dev) 479 { 480 struct omap2430_glue *glue = dev_get_drvdata(dev); 481 struct musb *musb = glue_to_musb(glue); 482 483 phy_power_off(musb->phy); 484 phy_exit(musb->phy); 485 glue->phy_suspended = 1; 486 487 return 0; 488 } 489 490 /* Glue layer needs to be suspended after musb_suspend() */ 491 static int omap2430_suspend_late(struct device *dev) 492 { 493 struct omap2430_glue *glue = dev_get_drvdata(dev); 494 495 if (glue->is_runtime_suspended) 496 return 0; 497 498 glue->needs_resume = 1; 499 500 return omap2430_runtime_suspend(dev); 501 } 502 503 static int omap2430_resume_early(struct device *dev) 504 { 505 struct omap2430_glue *glue = dev_get_drvdata(dev); 506 507 if (!glue->needs_resume) 508 return 0; 509 510 glue->needs_resume = 0; 511 512 return omap2430_runtime_resume(dev); 513 } 514 515 static int omap2430_resume(struct device *dev) 516 { 517 struct omap2430_glue *glue = dev_get_drvdata(dev); 518 struct musb *musb = glue_to_musb(glue); 519 520 phy_init(musb->phy); 521 phy_power_on(musb->phy); 522 glue->phy_suspended = 0; 523 524 return 0; 525 } 526 527 static const struct dev_pm_ops omap2430_pm_ops = { 528 .runtime_suspend = omap2430_runtime_suspend, 529 .runtime_resume = omap2430_runtime_resume, 530 .suspend = omap2430_suspend, 531 .suspend_late = omap2430_suspend_late, 532 .resume_early = omap2430_resume_early, 533 .resume = omap2430_resume, 534 }; 535 536 #define DEV_PM_OPS (&omap2430_pm_ops) 537 #else 538 #define DEV_PM_OPS NULL 539 #endif 540 541 #ifdef CONFIG_OF 542 static const struct of_device_id omap2430_id_table[] = { 543 { 544 .compatible = "ti,omap4-musb" 545 }, 546 { 547 .compatible = "ti,omap3-musb" 548 }, 549 {}, 550 }; 551 MODULE_DEVICE_TABLE(of, omap2430_id_table); 552 #endif 553 554 static struct platform_driver omap2430_driver = { 555 .probe = omap2430_probe, 556 .remove = omap2430_remove, 557 .driver = { 558 .name = "musb-omap2430", 559 .pm = DEV_PM_OPS, 560 .of_match_table = of_match_ptr(omap2430_id_table), 561 }, 562 }; 563 564 module_platform_driver(omap2430_driver); 565 566 MODULE_DESCRIPTION("OMAP2PLUS MUSB Glue Layer"); 567 MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>"); 568 MODULE_LICENSE("GPL v2"); 569