1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2010-2012 Semihalf 5 * Copyright (c) 2012 The FreeBSD Foundation 6 * Copyright (c) 2013 Ian Lepore <ian@freebsd.org> 7 * All rights reserved. 8 * 9 * Portions of this software were developed by Oleksandr Rybalko 10 * under sponsorship from the FreeBSD Foundation. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD$"); 36 37 /* 38 * EHCI driver for Freescale i.MX SoCs which incorporate the USBOH3 controller. 39 */ 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/kernel.h> 44 #include <sys/module.h> 45 #include <sys/bus.h> 46 #include <sys/condvar.h> 47 #include <sys/rman.h> 48 49 #include <dev/ofw/ofw_bus.h> 50 #include <dev/ofw/ofw_bus_subr.h> 51 52 #include <dev/usb/usb.h> 53 #include <dev/usb/usbdi.h> 54 #include <dev/usb/usb_busdma.h> 55 #include <dev/usb/usb_process.h> 56 #include <dev/usb/usb_controller.h> 57 #include <dev/usb/usb_bus.h> 58 #include <dev/usb/controller/ehci.h> 59 #include <dev/usb/controller/ehcireg.h> 60 #include "usbdevs.h" 61 62 #include <machine/bus.h> 63 #include <machine/resource.h> 64 65 #include <arm/freescale/imx/imx_ccmvar.h> 66 67 #include "opt_platform.h" 68 69 /* 70 * Notes on the hardware and related FDT data seen in the wild. 71 * 72 * There are two sets of registers in the USBOH3 implementation; documentation 73 * refers to them as "core" and "non-core" registers. A set of core register 74 * exists for each OTG or EHCI device. There is a single set of non-core 75 * registers per USBOH3, and they control aspects of operation not directly 76 * related to the USB specs, such as whether interrupts from each of the core 77 * devices are able to generate a SoC wakeup event. 78 * 79 * In the FreeBSD universe we might be inclined to describe the core and 80 * non-core registers by using a pair of resource address/size values (two 81 * entries in the reg property for each core). However, we have to work with 82 * existing FDT data (which mostly comes from the linux universe), and the way 83 * they've chosen to represent this is with an entry for a "usbmisc" device 84 * whose reg property describes the non-core registers. The way we handle FDT 85 * data, this means that the resources (memory-mapped register range) for the 86 * non-core registers belongs to a device other than the echi devices. 87 * 88 * Because the main ehci device cannot access registers in a range that's 89 * defined in the fdt data as belonging to another device, we implement a teeny 90 * little "usbmisc" driver which exists only to provide access to the usbmisc 91 * control register for each of the 4 usb controller instances. That little 92 * driver is implemented here in this file, before the main driver. 93 * 94 * In addition to the single usbmisc device, the existing FDT data defines a 95 * separate device for each of the OTG or EHCI cores within the USBOH3. Each of 96 * those devices has a set of core registers described by the reg property. 97 * 98 * The core registers for each of the four cores in the USBOH3 are divided into 99 * two parts: a set of imx-specific registers at an offset of 0 from the 100 * beginning of the register range, and the standard USB (EHCI or OTG) registers 101 * at an offset of 0x100 from the beginning of the register range. The FreeBSD 102 * way of dealing with this might be to map out two ranges in the reg property, 103 * but that's not what the alternate universe has done. To work with existing 104 * FDT data, we acquire the resource that maps all the core registers, then use 105 * bus_space_subregion() to create another resource that maps just the standard 106 * USB registers, which we provide to the standard USB code in the ehci_softc. 107 * 108 * The following compat strings have been seen for the OTG and EHCI cores. The 109 * FDT compat table in this driver contains all these strings, but as of this 110 * writing, not all of these SoCs have been tested with the driver. The fact 111 * that imx27 is common to all of them gives some hope that the driver will work 112 * on all these SoCs. 113 * - "fsl,imx23-usb", "fsl,imx27-usb"; 114 * - "fsl,imx25-usb", "fsl,imx27-usb"; 115 * - "fsl,imx28-usb", "fsl,imx27-usb"; 116 * - "fsl,imx51-usb", "fsl,imx27-usb"; 117 * - "fsl,imx53-usb", "fsl,imx27-usb"; 118 * - "fsl,imx6q-usb", "fsl,imx27-usb"; 119 * 120 * The FDT data for some SoCs contains the following properties, which we don't 121 * currently do anything with: 122 * - fsl,usbmisc = <&usbmisc 0>; 123 * - fsl,usbphy = <&usbphy0>; 124 * 125 * Some imx SoCs have FDT data related to USB PHY, some don't. We have separate 126 * usbphy drivers where needed; this data is mentioned here just to keep all the 127 * imx-FDT-usb-related info in one place. Here are the usbphy compat strings 128 * known to exist: 129 * - "nop-usbphy" 130 * - "usb-nop-xceiv"; 131 * - "fsl,imx23-usbphy" 132 * - "fsl,imx28-usbphy", "fsl,imx23-usbphy"; 133 * - "fsl,imx6q-usbphy", "fsl,imx23-usbphy"; 134 * 135 */ 136 137 /*----------------------------------------------------------------------------- 138 * imx_usbmisc driver 139 *---------------------------------------------------------------------------*/ 140 141 #define USBNC_OVER_CUR_POL (1u << 8) 142 #define USBNC_OVER_CUR_DIS (1u << 7) 143 144 struct imx_usbmisc_softc { 145 device_t dev; 146 struct resource *mmio; 147 }; 148 149 static struct ofw_compat_data usbmisc_compat_data[] = { 150 {"fsl,imx6q-usbmisc", true}, 151 {"fsl,imx51-usbmisc", true}, 152 {"fsl,imx25-usbmisc", true}, 153 {NULL, false}, 154 }; 155 156 static void 157 imx_usbmisc_set_ctrl(device_t dev, u_int index, uint32_t bits) 158 { 159 struct imx_usbmisc_softc *sc; 160 uint32_t reg; 161 162 sc = device_get_softc(dev); 163 reg = bus_read_4(sc->mmio, index * sizeof(uint32_t)); 164 bus_write_4(sc->mmio, index * sizeof(uint32_t), reg | bits); 165 } 166 167 #ifdef notyet 168 static void 169 imx_usbmisc_clr_ctrl(device_t dev, u_int index, uint32_t bits) 170 { 171 struct imx_usbmisc_softc *sc; 172 uint32_t reg; 173 174 sc = device_get_softc(dev); 175 reg = bus_read_4(sc->mmio, index * sizeof(uint32_t)); 176 bus_write_4(sc->mmio, index * sizeof(uint32_t), reg & ~bits); 177 } 178 #endif 179 180 static int 181 imx_usbmisc_probe(device_t dev) 182 { 183 184 if (!ofw_bus_status_okay(dev)) 185 return (ENXIO); 186 187 if (ofw_bus_search_compatible(dev, usbmisc_compat_data)->ocd_data) { 188 device_set_desc(dev, "i.MX USB Misc Control"); 189 return (BUS_PROBE_DEFAULT); 190 } 191 return (ENXIO); 192 } 193 194 static int 195 imx_usbmisc_detach(device_t dev) 196 { 197 struct imx_usbmisc_softc *sc; 198 199 sc = device_get_softc(dev); 200 201 if (sc->mmio != NULL) 202 bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->mmio); 203 204 return (0); 205 } 206 207 static int 208 imx_usbmisc_attach(device_t dev) 209 { 210 struct imx_usbmisc_softc *sc; 211 int rid; 212 213 sc = device_get_softc(dev); 214 215 /* Allocate bus_space resources. */ 216 rid = 0; 217 sc->mmio = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, 218 RF_ACTIVE); 219 if (sc->mmio == NULL) { 220 device_printf(dev, "Cannot allocate memory resources\n"); 221 return (ENXIO); 222 } 223 224 OF_device_register_xref(OF_xref_from_node(ofw_bus_get_node(dev)), dev); 225 226 return (0); 227 } 228 229 static device_method_t imx_usbmisc_methods[] = { 230 /* Device interface */ 231 DEVMETHOD(device_probe, imx_usbmisc_probe), 232 DEVMETHOD(device_attach, imx_usbmisc_attach), 233 DEVMETHOD(device_detach, imx_usbmisc_detach), 234 235 DEVMETHOD_END 236 }; 237 238 static driver_t imx_usbmisc_driver = { 239 "imx_usbmisc", 240 imx_usbmisc_methods, 241 sizeof(struct imx_usbmisc_softc) 242 }; 243 244 /* 245 * This driver needs to start before the ehci driver, but later than the usual 246 * "special" drivers like clocks and cpu. Ehci starts at DEFAULT so 247 * DEFAULT-1000 seems good. 248 */ 249 EARLY_DRIVER_MODULE(imx_usbmisc, simplebus, imx_usbmisc_driver, 250 0, 0, BUS_PASS_DEFAULT - 1000); 251 252 /*----------------------------------------------------------------------------- 253 * imx_ehci driver... 254 *---------------------------------------------------------------------------*/ 255 256 /* 257 * Each EHCI device in the SoC has some SoC-specific per-device registers at an 258 * offset of 0, then the standard EHCI registers begin at an offset of 0x100. 259 */ 260 #define IMX_EHCI_REG_OFF 0x100 261 #define IMX_EHCI_REG_SIZE 0x100 262 263 struct imx_ehci_softc { 264 ehci_softc_t ehci_softc; 265 device_t dev; 266 struct resource *ehci_mem_res; /* EHCI core regs. */ 267 struct resource *ehci_irq_res; /* EHCI core IRQ. */ 268 }; 269 270 static struct ofw_compat_data compat_data[] = { 271 {"fsl,imx6q-usb", 1}, 272 {"fsl,imx53-usb", 1}, 273 {"fsl,imx51-usb", 1}, 274 {"fsl,imx28-usb", 1}, 275 {"fsl,imx27-usb", 1}, 276 {"fsl,imx25-usb", 1}, 277 {"fsl,imx23-usb", 1}, 278 {NULL, 0}, 279 }; 280 281 static void 282 imx_ehci_post_reset(struct ehci_softc *ehci_softc) 283 { 284 uint32_t usbmode; 285 286 /* Force HOST mode */ 287 usbmode = EOREAD4(ehci_softc, EHCI_USBMODE_NOLPM); 288 usbmode &= ~EHCI_UM_CM; 289 usbmode |= EHCI_UM_CM_HOST; 290 EOWRITE4(ehci_softc, EHCI_USBMODE_NOLPM, usbmode); 291 } 292 293 static int 294 imx_ehci_probe(device_t dev) 295 { 296 297 if (!ofw_bus_status_okay(dev)) 298 return (ENXIO); 299 300 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data != 0) { 301 device_set_desc(dev, "Freescale i.MX integrated USB controller"); 302 return (BUS_PROBE_DEFAULT); 303 } 304 return (ENXIO); 305 } 306 307 static int 308 imx_ehci_detach(device_t dev) 309 { 310 struct imx_ehci_softc *sc; 311 ehci_softc_t *esc; 312 int err; 313 314 sc = device_get_softc(dev); 315 316 esc = &sc->ehci_softc; 317 318 /* First detach all children; we can't detach if that fails. */ 319 if ((err = device_delete_children(dev)) != 0) 320 return (err); 321 322 if (esc->sc_flags & EHCI_SCFLG_DONEINIT) 323 ehci_detach(esc); 324 if (esc->sc_intr_hdl != NULL) 325 bus_teardown_intr(dev, esc->sc_irq_res, 326 esc->sc_intr_hdl); 327 if (sc->ehci_irq_res != NULL) 328 bus_release_resource(dev, SYS_RES_IRQ, 0, 329 sc->ehci_irq_res); 330 if (sc->ehci_mem_res != NULL) 331 bus_release_resource(dev, SYS_RES_MEMORY, 0, 332 sc->ehci_mem_res); 333 334 usb_bus_mem_free_all(&esc->sc_bus, &ehci_iterate_hw_softc); 335 336 return (0); 337 } 338 339 static void 340 imx_ehci_disable_oc(struct imx_ehci_softc *sc) 341 { 342 device_t usbmdev; 343 pcell_t usbmprops[2]; 344 phandle_t node; 345 ssize_t size; 346 int index; 347 348 /* Get the reference to the usbmisc driver from the fdt data */ 349 node = ofw_bus_get_node(sc->dev); 350 size = OF_getencprop(node, "fsl,usbmisc", usbmprops, 351 sizeof(usbmprops)); 352 if (size < sizeof(usbmprops)) { 353 device_printf(sc->dev, "failed to retrieve fsl,usbmisc " 354 "property, cannot disable overcurrent protection"); 355 return; 356 } 357 /* Retrieve the device_t via the xref handle. */ 358 usbmdev = OF_device_from_xref(usbmprops[0]); 359 if (usbmdev == NULL) { 360 device_printf(sc->dev, "usbmisc device not found, " 361 "cannot disable overcurrent protection"); 362 return; 363 } 364 /* Call the device routine to set the overcurrent disable bit. */ 365 index = usbmprops[1]; 366 imx_usbmisc_set_ctrl(usbmdev, index, USBNC_OVER_CUR_DIS); 367 } 368 369 static int 370 imx_ehci_attach(device_t dev) 371 { 372 struct imx_ehci_softc *sc; 373 ehci_softc_t *esc; 374 int err, rid; 375 376 sc = device_get_softc(dev); 377 sc->dev = dev; 378 esc = &sc->ehci_softc; 379 err = 0; 380 381 /* Allocate bus_space resources. */ 382 rid = 0; 383 sc->ehci_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, 384 RF_ACTIVE); 385 if (sc->ehci_mem_res == NULL) { 386 device_printf(dev, "Cannot allocate memory resources\n"); 387 err = ENXIO; 388 goto out; 389 } 390 391 rid = 0; 392 sc->ehci_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, 393 RF_ACTIVE); 394 if (sc->ehci_irq_res == NULL) { 395 device_printf(dev, "Cannot allocate IRQ resources\n"); 396 err = ENXIO; 397 goto out; 398 } 399 400 esc->sc_io_tag = rman_get_bustag(sc->ehci_mem_res); 401 esc->sc_bus.parent = dev; 402 esc->sc_bus.devices = esc->sc_devices; 403 esc->sc_bus.devices_max = EHCI_MAX_DEVICES; 404 esc->sc_bus.dma_bits = 32; 405 406 /* allocate all DMA memory */ 407 if (usb_bus_mem_alloc_all(&esc->sc_bus, USB_GET_DMA_TAG(dev), 408 &ehci_iterate_hw_softc) != 0) { 409 device_printf(dev, "usb_bus_mem_alloc_all() failed\n"); 410 err = ENOMEM; 411 goto out; 412 } 413 414 /* 415 * Set handle to USB related registers subregion used by 416 * generic EHCI driver. 417 */ 418 err = bus_space_subregion(esc->sc_io_tag, 419 rman_get_bushandle(sc->ehci_mem_res), 420 IMX_EHCI_REG_OFF, IMX_EHCI_REG_SIZE, &esc->sc_io_hdl); 421 if (err != 0) { 422 device_printf(dev, "bus_space_subregion() failed\n"); 423 err = ENXIO; 424 goto out; 425 } 426 427 /* Setup interrupt handler. */ 428 err = bus_setup_intr(dev, sc->ehci_irq_res, INTR_TYPE_BIO | INTR_MPSAFE, 429 NULL, (driver_intr_t *)ehci_interrupt, esc, &esc->sc_intr_hdl); 430 if (err != 0) { 431 device_printf(dev, "Could not setup IRQ\n"); 432 goto out; 433 } 434 435 /* Turn on clocks. */ 436 imx_ccm_usb_enable(dev); 437 438 /* Disable overcurrent detection, if configured to do so. */ 439 if (OF_hasprop(ofw_bus_get_node(sc->dev), "disable-over-current")) 440 imx_ehci_disable_oc(sc); 441 442 /* Add USB bus device. */ 443 esc->sc_bus.bdev = device_add_child(dev, "usbus", -1); 444 if (esc->sc_bus.bdev == NULL) { 445 device_printf(dev, "Could not add USB device\n"); 446 goto out; 447 } 448 device_set_ivars(esc->sc_bus.bdev, &esc->sc_bus); 449 450 esc->sc_id_vendor = USB_VENDOR_FREESCALE; 451 strlcpy(esc->sc_vendor, "Freescale", sizeof(esc->sc_vendor)); 452 453 /* 454 * Set flags that affect ehci_init() behavior, and hook our post-reset 455 * code into the standard controller code. 456 */ 457 esc->sc_flags |= EHCI_SCFLG_NORESTERM | EHCI_SCFLG_TT; 458 esc->sc_vendor_post_reset = imx_ehci_post_reset; 459 esc->sc_vendor_get_port_speed = ehci_get_port_speed_portsc; 460 461 err = ehci_init(esc); 462 if (err != 0) { 463 device_printf(dev, "USB init failed, usb_err_t=%d\n", 464 err); 465 goto out; 466 } 467 esc->sc_flags |= EHCI_SCFLG_DONEINIT; 468 469 /* Probe the bus. */ 470 err = device_probe_and_attach(esc->sc_bus.bdev); 471 if (err != 0) { 472 device_printf(dev, 473 "device_probe_and_attach() failed\n"); 474 goto out; 475 } 476 477 err = 0; 478 479 out: 480 481 if (err != 0) 482 imx_ehci_detach(dev); 483 484 return (err); 485 } 486 487 static device_method_t ehci_methods[] = { 488 /* Device interface */ 489 DEVMETHOD(device_probe, imx_ehci_probe), 490 DEVMETHOD(device_attach, imx_ehci_attach), 491 DEVMETHOD(device_detach, imx_ehci_detach), 492 DEVMETHOD(device_suspend, bus_generic_suspend), 493 DEVMETHOD(device_resume, bus_generic_resume), 494 DEVMETHOD(device_shutdown, bus_generic_shutdown), 495 496 /* Bus interface */ 497 DEVMETHOD(bus_print_child, bus_generic_print_child), 498 499 DEVMETHOD_END 500 }; 501 502 static driver_t ehci_driver = { 503 "ehci", 504 ehci_methods, 505 sizeof(struct imx_ehci_softc) 506 }; 507 508 DRIVER_MODULE(imx_ehci, simplebus, ehci_driver, 0, 0); 509 MODULE_DEPEND(imx_ehci, usb, 1, 1, 1); 510