uart_core.c revision 151792
1139749Simp/*- 2119815Smarcel * Copyright (c) 2003 Marcel Moolenaar 3119815Smarcel * All rights reserved. 4119815Smarcel * 5119815Smarcel * Redistribution and use in source and binary forms, with or without 6119815Smarcel * modification, are permitted provided that the following conditions 7119815Smarcel * are met: 8119815Smarcel * 9119815Smarcel * 1. Redistributions of source code must retain the above copyright 10119815Smarcel * notice, this list of conditions and the following disclaimer. 11119815Smarcel * 2. Redistributions in binary form must reproduce the above copyright 12119815Smarcel * notice, this list of conditions and the following disclaimer in the 13119815Smarcel * documentation and/or other materials provided with the distribution. 14119815Smarcel * 15119815Smarcel * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16119815Smarcel * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17119815Smarcel * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18119815Smarcel * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19119815Smarcel * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20119815Smarcel * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21119815Smarcel * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22119815Smarcel * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23119815Smarcel * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24119815Smarcel * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25119815Smarcel */ 26119815Smarcel 27119815Smarcel#include <sys/cdefs.h> 28119815Smarcel__FBSDID("$FreeBSD: head/sys/dev/uart/uart_core.c 151792 2005-10-28 06:30:39Z marcel $"); 29119815Smarcel 30119815Smarcel#ifndef KLD_MODULE 31119815Smarcel#include "opt_comconsole.h" 32119815Smarcel#endif 33119815Smarcel 34119815Smarcel#include <sys/param.h> 35119815Smarcel#include <sys/systm.h> 36119815Smarcel#include <sys/bus.h> 37119815Smarcel#include <sys/conf.h> 38119815Smarcel#include <sys/cons.h> 39119815Smarcel#include <sys/fcntl.h> 40119815Smarcel#include <sys/interrupt.h> 41131921Smarcel#include <sys/kdb.h> 42119815Smarcel#include <sys/kernel.h> 43119815Smarcel#include <sys/malloc.h> 44119815Smarcel#include <sys/queue.h> 45119815Smarcel#include <sys/reboot.h> 46119815Smarcel#include <machine/bus.h> 47119815Smarcel#include <sys/rman.h> 48119815Smarcel#include <sys/termios.h> 49119815Smarcel#include <sys/tty.h> 50119815Smarcel#include <machine/resource.h> 51119815Smarcel#include <machine/stdarg.h> 52119815Smarcel 53119815Smarcel#include <dev/uart/uart.h> 54119815Smarcel#include <dev/uart/uart_bus.h> 55119815Smarcel#include <dev/uart/uart_cpu.h> 56119815Smarcel 57119815Smarcel#include "uart_if.h" 58119815Smarcel 59119815Smarceldevclass_t uart_devclass; 60119815Smarcelchar uart_driver_name[] = "uart"; 61119815Smarcel 62119815SmarcelSLIST_HEAD(uart_devinfo_list, uart_devinfo) uart_sysdevs = 63119815Smarcel SLIST_HEAD_INITIALIZER(uart_sysdevs); 64119815Smarcel 65119815SmarcelMALLOC_DEFINE(M_UART, "UART", "UART driver"); 66119815Smarcel 67119815Smarcelvoid 68119815Smarceluart_add_sysdev(struct uart_devinfo *di) 69119815Smarcel{ 70119815Smarcel SLIST_INSERT_HEAD(&uart_sysdevs, di, next); 71119815Smarcel} 72119815Smarcel 73119815Smarcel/* 74119815Smarcel * A break condition has been detected. We treat the break condition as 75119815Smarcel * a special case that should not happen during normal operation. When 76119815Smarcel * the break condition is to be passed to higher levels in the form of 77119815Smarcel * a NUL character, we really want the break to be in the right place in 78119815Smarcel * the input stream. The overhead to achieve that is not in relation to 79119815Smarcel * the exceptional nature of the break condition, so we permit ourselves 80119815Smarcel * to be sloppy. 81119815Smarcel */ 82119815Smarcelstatic void 83119815Smarceluart_intr_break(struct uart_softc *sc) 84119815Smarcel{ 85119815Smarcel 86131921Smarcel#if defined(KDB) && defined(BREAK_TO_DEBUGGER) 87119815Smarcel if (sc->sc_sysdev != NULL && sc->sc_sysdev->type == UART_DEV_CONSOLE) { 88131921Smarcel kdb_enter("Line break on console"); 89119815Smarcel return; 90119815Smarcel } 91119815Smarcel#endif 92119815Smarcel if (sc->sc_opened) 93119815Smarcel atomic_set_32(&sc->sc_ttypend, UART_IPEND_BREAK); 94119815Smarcel} 95119815Smarcel 96119815Smarcel/* 97119815Smarcel * Handle a receiver overrun situation. We lost at least 1 byte in the 98119815Smarcel * input stream and it's our job to contain the situation. We grab as 99119815Smarcel * much of the data we can, but otherwise flush the receiver FIFO to 100119815Smarcel * create some breathing room. The net effect is that we avoid the 101119815Smarcel * overrun condition to happen for the next X characters, where X is 102119815Smarcel * related to the FIFO size at the cost of loosing data right away. 103119815Smarcel * So, instead of having multiple overrun interrupts in close proximity 104119815Smarcel * to each other and possibly pessimizing UART interrupt latency for 105119815Smarcel * other UARTs in a multiport configuration, we create a longer segment 106119815Smarcel * of missing characters by freeing up the FIFO. 107119815Smarcel * Each overrun condition is marked in the input buffer by a token. The 108119815Smarcel * token represents the loss of at least one, but possible more bytes in 109119815Smarcel * the input stream. 110119815Smarcel */ 111119815Smarcelstatic void 112119815Smarceluart_intr_overrun(struct uart_softc *sc) 113119815Smarcel{ 114119815Smarcel 115119815Smarcel if (sc->sc_opened) { 116119815Smarcel UART_RECEIVE(sc); 117119815Smarcel if (uart_rx_put(sc, UART_STAT_OVERRUN)) 118119815Smarcel sc->sc_rxbuf[sc->sc_rxput] = UART_STAT_OVERRUN; 119119815Smarcel atomic_set_32(&sc->sc_ttypend, UART_IPEND_RXREADY); 120119815Smarcel } 121119815Smarcel UART_FLUSH(sc, UART_FLUSH_RECEIVER); 122119815Smarcel} 123119815Smarcel 124119815Smarcel/* 125119815Smarcel * Received data ready. 126119815Smarcel */ 127119815Smarcelstatic void 128119815Smarceluart_intr_rxready(struct uart_softc *sc) 129119815Smarcel{ 130119815Smarcel int rxp; 131119815Smarcel 132119815Smarcel rxp = sc->sc_rxput; 133119815Smarcel UART_RECEIVE(sc); 134131921Smarcel#if defined(KDB) && defined(ALT_BREAK_TO_DEBUGGER) 135119815Smarcel if (sc->sc_sysdev != NULL && sc->sc_sysdev->type == UART_DEV_CONSOLE) { 136119815Smarcel while (rxp != sc->sc_rxput) { 137131921Smarcel if (kdb_alt_break(sc->sc_rxbuf[rxp++], &sc->sc_altbrk)) 138131921Smarcel kdb_enter("Break sequence on console"); 139119815Smarcel if (rxp == sc->sc_rxbufsz) 140119815Smarcel rxp = 0; 141119815Smarcel } 142119815Smarcel } 143119815Smarcel#endif 144119815Smarcel if (sc->sc_opened) 145119815Smarcel atomic_set_32(&sc->sc_ttypend, UART_IPEND_RXREADY); 146119815Smarcel else 147119815Smarcel sc->sc_rxput = sc->sc_rxget; /* Ignore received data. */ 148119815Smarcel} 149119815Smarcel 150119815Smarcel/* 151119815Smarcel * Line or modem status change (OOB signalling). 152119815Smarcel * We pass the signals to the software interrupt handler for further 153119815Smarcel * processing. Note that we merge the delta bits, but set the state 154119815Smarcel * bits. This is to avoid loosing state transitions due to having more 155119815Smarcel * than 1 hardware interrupt between software interrupts. 156119815Smarcel */ 157119815Smarcelstatic void 158119815Smarceluart_intr_sigchg(struct uart_softc *sc) 159119815Smarcel{ 160119815Smarcel int new, old, sig; 161119815Smarcel 162119815Smarcel sig = UART_GETSIG(sc); 163119996Smarcel 164119996Smarcel if (sc->sc_pps.ppsparam.mode & PPS_CAPTUREBOTH) { 165119996Smarcel if (sig & UART_SIG_DPPS) { 166119996Smarcel pps_capture(&sc->sc_pps); 167119996Smarcel pps_event(&sc->sc_pps, (sig & UART_SIG_PPS) ? 168119996Smarcel PPS_CAPTUREASSERT : PPS_CAPTURECLEAR); 169119996Smarcel } 170119996Smarcel } 171119996Smarcel 172119815Smarcel do { 173119815Smarcel old = sc->sc_ttypend; 174119815Smarcel new = old & ~UART_SIGMASK_STATE; 175119815Smarcel new |= sig & UART_IPEND_SIGMASK; 176119815Smarcel new |= UART_IPEND_SIGCHG; 177119815Smarcel } while (!atomic_cmpset_32(&sc->sc_ttypend, old, new)); 178119815Smarcel} 179119815Smarcel 180119815Smarcel/* 181119815Smarcel * The transmitter can accept more data. 182119815Smarcel */ 183119815Smarcelstatic void 184119815Smarceluart_intr_txidle(struct uart_softc *sc) 185119815Smarcel{ 186119815Smarcel if (sc->sc_txbusy) { 187119815Smarcel sc->sc_txbusy = 0; 188119815Smarcel atomic_set_32(&sc->sc_ttypend, UART_IPEND_TXIDLE); 189119815Smarcel } 190119815Smarcel} 191119815Smarcel 192119815Smarcelstatic void 193119815Smarceluart_intr(void *arg) 194119815Smarcel{ 195119815Smarcel struct uart_softc *sc = arg; 196119815Smarcel int ipend; 197119815Smarcel 198119815Smarcel if (sc->sc_leaving) 199119815Smarcel return; 200119815Smarcel 201120146Smarcel do { 202120146Smarcel ipend = UART_IPEND(sc); 203120146Smarcel if (ipend == 0) 204120146Smarcel break; 205120146Smarcel if (ipend & UART_IPEND_OVERRUN) 206120146Smarcel uart_intr_overrun(sc); 207120146Smarcel if (ipend & UART_IPEND_BREAK) 208120146Smarcel uart_intr_break(sc); 209120146Smarcel if (ipend & UART_IPEND_RXREADY) 210120146Smarcel uart_intr_rxready(sc); 211120146Smarcel if (ipend & UART_IPEND_SIGCHG) 212120146Smarcel uart_intr_sigchg(sc); 213120146Smarcel if (ipend & UART_IPEND_TXIDLE) 214120146Smarcel uart_intr_txidle(sc); 215120146Smarcel } while (1); 216119815Smarcel 217119815Smarcel if (sc->sc_opened && sc->sc_ttypend != 0) 218119815Smarcel swi_sched(sc->sc_softih, 0); 219119815Smarcel} 220119815Smarcel 221119815Smarcelint 222120452Smarceluart_bus_probe(device_t dev, int regshft, int rclk, int rid, int chan) 223119815Smarcel{ 224119815Smarcel struct uart_softc *sc; 225119815Smarcel struct uart_devinfo *sysdev; 226119815Smarcel int error; 227119815Smarcel 228119815Smarcel /* 229119815Smarcel * Initialize the instance. Note that the instance (=softc) does 230119815Smarcel * not necessarily match the hardware specific softc. We can't do 231119815Smarcel * anything about it now, because we may not attach to the device. 232119815Smarcel * Hardware drivers cannot use any of the class specific fields 233119815Smarcel * while probing. 234119815Smarcel */ 235119815Smarcel sc = device_get_softc(dev); 236119815Smarcel kobj_init((kobj_t)sc, (kobj_class_t)sc->sc_class); 237119815Smarcel sc->sc_dev = dev; 238119815Smarcel if (device_get_desc(dev) == NULL) 239119815Smarcel device_set_desc(dev, sc->sc_class->name); 240119815Smarcel 241119815Smarcel /* 242119815Smarcel * Allocate the register resource. We assume that all UARTs have 243119815Smarcel * a single register window in either I/O port space or memory 244119815Smarcel * mapped I/O space. Any UART that needs multiple windows will 245119815Smarcel * consequently not be supported by this driver as-is. We try I/O 246119815Smarcel * port space first because that's the common case. 247119815Smarcel */ 248119815Smarcel sc->sc_rrid = rid; 249119815Smarcel sc->sc_rtype = SYS_RES_IOPORT; 250119815Smarcel sc->sc_rres = bus_alloc_resource(dev, sc->sc_rtype, &sc->sc_rrid, 251119815Smarcel 0, ~0, sc->sc_class->uc_range, RF_ACTIVE); 252119815Smarcel if (sc->sc_rres == NULL) { 253119815Smarcel sc->sc_rrid = rid; 254119815Smarcel sc->sc_rtype = SYS_RES_MEMORY; 255119815Smarcel sc->sc_rres = bus_alloc_resource(dev, sc->sc_rtype, 256119815Smarcel &sc->sc_rrid, 0, ~0, sc->sc_class->uc_range, RF_ACTIVE); 257119815Smarcel if (sc->sc_rres == NULL) 258119815Smarcel return (ENXIO); 259119815Smarcel } 260119815Smarcel 261119815Smarcel /* 262119815Smarcel * Fill in the bus access structure and compare this device with 263119815Smarcel * a possible console device and/or a debug port. We set the flags 264119815Smarcel * in the softc so that the hardware dependent probe can adjust 265119815Smarcel * accordingly. In general, you don't want to permanently disrupt 266119815Smarcel * console I/O. 267119815Smarcel */ 268119815Smarcel sc->sc_bas.bsh = rman_get_bushandle(sc->sc_rres); 269119815Smarcel sc->sc_bas.bst = rman_get_bustag(sc->sc_rres); 270120452Smarcel sc->sc_bas.chan = chan; 271119815Smarcel sc->sc_bas.regshft = regshft; 272119815Smarcel sc->sc_bas.rclk = (rclk == 0) ? sc->sc_class->uc_rclk : rclk; 273119815Smarcel 274119815Smarcel SLIST_FOREACH(sysdev, &uart_sysdevs, next) { 275120452Smarcel if (chan == sysdev->bas.chan && 276120452Smarcel uart_cpu_eqres(&sc->sc_bas, &sysdev->bas)) { 277119815Smarcel /* XXX check if ops matches class. */ 278119815Smarcel sc->sc_sysdev = sysdev; 279119815Smarcel break; 280119815Smarcel } 281119815Smarcel } 282119815Smarcel 283119815Smarcel error = UART_PROBE(sc); 284119815Smarcel bus_release_resource(dev, sc->sc_rtype, sc->sc_rrid, sc->sc_rres); 285151792Smarcel return ((error) ? error : BUS_PROBE_DEFAULT); 286119815Smarcel} 287119815Smarcel 288119815Smarcelint 289119815Smarceluart_bus_attach(device_t dev) 290119815Smarcel{ 291119815Smarcel struct uart_softc *sc, *sc0; 292119815Smarcel const char *sep; 293119815Smarcel int error; 294119815Smarcel 295119815Smarcel /* 296119815Smarcel * The sc_class field defines the type of UART we're going to work 297119815Smarcel * with and thus the size of the softc. Replace the generic softc 298119815Smarcel * with one that matches the UART now that we're certain we handle 299119815Smarcel * the device. 300119815Smarcel */ 301119815Smarcel sc0 = device_get_softc(dev); 302119815Smarcel if (sc0->sc_class->size > sizeof(*sc)) { 303119815Smarcel sc = malloc(sc0->sc_class->size, M_UART, M_WAITOK|M_ZERO); 304119815Smarcel bcopy(sc0, sc, sizeof(*sc)); 305119815Smarcel device_set_softc(dev, sc); 306119815Smarcel } else 307119815Smarcel sc = sc0; 308119815Smarcel 309119815Smarcel /* 310119815Smarcel * Protect ourselves against interrupts while we're not completely 311119815Smarcel * finished attaching and initializing. We don't expect interrupts 312119815Smarcel * until after UART_ATTACH() though. 313119815Smarcel */ 314119815Smarcel sc->sc_leaving = 1; 315119815Smarcel 316120143Smarcel mtx_init(&sc->sc_hwmtx, "uart_hwmtx", NULL, MTX_SPIN); 317120143Smarcel 318119815Smarcel /* 319119815Smarcel * Re-allocate. We expect that the softc contains the information 320119815Smarcel * collected by uart_bus_probe() intact. 321119815Smarcel */ 322119815Smarcel sc->sc_rres = bus_alloc_resource(dev, sc->sc_rtype, &sc->sc_rrid, 323119815Smarcel 0, ~0, sc->sc_class->uc_range, RF_ACTIVE); 324143025Smarius if (sc->sc_rres == NULL) { 325143025Smarius mtx_destroy(&sc->sc_hwmtx); 326119815Smarcel return (ENXIO); 327143025Smarius } 328120380Snyan sc->sc_bas.bsh = rman_get_bushandle(sc->sc_rres); 329120380Snyan sc->sc_bas.bst = rman_get_bustag(sc->sc_rres); 330120380Snyan 331119815Smarcel sc->sc_irid = 0; 332127135Snjl sc->sc_ires = bus_alloc_resource_any(dev, SYS_RES_IRQ, &sc->sc_irid, 333143025Smarius RF_ACTIVE | RF_SHAREABLE); 334119815Smarcel if (sc->sc_ires != NULL) { 335119815Smarcel error = BUS_SETUP_INTR(device_get_parent(dev), dev, 336119815Smarcel sc->sc_ires, INTR_TYPE_TTY | INTR_FAST, uart_intr, 337119815Smarcel sc, &sc->sc_icookie); 338119815Smarcel if (error) 339119815Smarcel error = BUS_SETUP_INTR(device_get_parent(dev), dev, 340128909Smarcel sc->sc_ires, INTR_TYPE_TTY | INTR_MPSAFE, 341128909Smarcel uart_intr, sc, &sc->sc_icookie); 342119815Smarcel else 343119815Smarcel sc->sc_fastintr = 1; 344119815Smarcel 345119815Smarcel if (error) { 346119815Smarcel device_printf(dev, "could not activate interrupt\n"); 347119815Smarcel bus_release_resource(dev, SYS_RES_IRQ, sc->sc_irid, 348119815Smarcel sc->sc_ires); 349119815Smarcel sc->sc_ires = NULL; 350119815Smarcel } 351119815Smarcel } 352119815Smarcel if (sc->sc_ires == NULL) { 353119815Smarcel /* XXX no interrupt resource. Force polled mode. */ 354119815Smarcel sc->sc_polled = 1; 355119815Smarcel } 356119815Smarcel 357119815Smarcel sc->sc_rxbufsz = IBUFSIZ; 358119815Smarcel sc->sc_rxbuf = malloc(sc->sc_rxbufsz * sizeof(*sc->sc_rxbuf), 359119815Smarcel M_UART, M_WAITOK); 360119815Smarcel sc->sc_txbuf = malloc(sc->sc_txfifosz * sizeof(*sc->sc_txbuf), 361119815Smarcel M_UART, M_WAITOK); 362119815Smarcel 363119815Smarcel error = UART_ATTACH(sc); 364119815Smarcel if (error) 365119815Smarcel goto fail; 366119815Smarcel 367119815Smarcel if (sc->sc_hwiflow || sc->sc_hwoflow) { 368119815Smarcel sep = ""; 369119815Smarcel device_print_prettyname(dev); 370119815Smarcel if (sc->sc_hwiflow) { 371119815Smarcel printf("%sRTS iflow", sep); 372119815Smarcel sep = ", "; 373119815Smarcel } 374119815Smarcel if (sc->sc_hwoflow) { 375119815Smarcel printf("%sCTS oflow", sep); 376119815Smarcel sep = ", "; 377119815Smarcel } 378119815Smarcel printf("\n"); 379119815Smarcel } 380119815Smarcel 381119815Smarcel if (bootverbose && (sc->sc_fastintr || sc->sc_polled)) { 382119815Smarcel sep = ""; 383119815Smarcel device_print_prettyname(dev); 384119815Smarcel if (sc->sc_fastintr) { 385119815Smarcel printf("%sfast interrupt", sep); 386119815Smarcel sep = ", "; 387119815Smarcel } 388119815Smarcel if (sc->sc_polled) { 389119815Smarcel printf("%spolled mode", sep); 390119815Smarcel sep = ", "; 391119815Smarcel } 392119815Smarcel printf("\n"); 393119815Smarcel } 394119815Smarcel 395119815Smarcel if (sc->sc_sysdev != NULL) { 396137706Smarcel if (sc->sc_sysdev->baudrate == 0) { 397137706Smarcel if (UART_IOCTL(sc, UART_IOCTL_BAUD, 398137706Smarcel (intptr_t)&sc->sc_sysdev->baudrate) != 0) 399137706Smarcel sc->sc_sysdev->baudrate = -1; 400137706Smarcel } 401119815Smarcel switch (sc->sc_sysdev->type) { 402119815Smarcel case UART_DEV_CONSOLE: 403119815Smarcel device_printf(dev, "console"); 404119815Smarcel break; 405119815Smarcel case UART_DEV_DBGPORT: 406119815Smarcel device_printf(dev, "debug port"); 407119815Smarcel break; 408119815Smarcel case UART_DEV_KEYBOARD: 409119815Smarcel device_printf(dev, "keyboard"); 410119815Smarcel break; 411119815Smarcel default: 412119815Smarcel device_printf(dev, "unknown system device"); 413119815Smarcel break; 414119815Smarcel } 415119815Smarcel printf(" (%d,%c,%d,%d)\n", sc->sc_sysdev->baudrate, 416119815Smarcel "noems"[sc->sc_sysdev->parity], sc->sc_sysdev->databits, 417119815Smarcel sc->sc_sysdev->stopbits); 418119815Smarcel } 419119815Smarcel 420119996Smarcel sc->sc_pps.ppscap = PPS_CAPTUREBOTH; 421119996Smarcel pps_init(&sc->sc_pps); 422119996Smarcel 423119815Smarcel error = (sc->sc_sysdev != NULL && sc->sc_sysdev->attach != NULL) 424119815Smarcel ? (*sc->sc_sysdev->attach)(sc) : uart_tty_attach(sc); 425119815Smarcel if (error) 426119815Smarcel goto fail; 427119815Smarcel 428119815Smarcel sc->sc_leaving = 0; 429119815Smarcel uart_intr(sc); 430119815Smarcel return (0); 431119815Smarcel 432119815Smarcel fail: 433119815Smarcel free(sc->sc_txbuf, M_UART); 434119815Smarcel free(sc->sc_rxbuf, M_UART); 435119815Smarcel 436119815Smarcel if (sc->sc_ires != NULL) { 437119815Smarcel bus_teardown_intr(dev, sc->sc_ires, sc->sc_icookie); 438119815Smarcel bus_release_resource(dev, SYS_RES_IRQ, sc->sc_irid, 439119815Smarcel sc->sc_ires); 440119815Smarcel } 441119815Smarcel bus_release_resource(dev, sc->sc_rtype, sc->sc_rrid, sc->sc_rres); 442119815Smarcel 443143025Smarius mtx_destroy(&sc->sc_hwmtx); 444143025Smarius 445119815Smarcel return (error); 446119815Smarcel} 447119815Smarcel 448119815Smarcelint 449119815Smarceluart_bus_detach(device_t dev) 450119815Smarcel{ 451119815Smarcel struct uart_softc *sc; 452119815Smarcel 453119815Smarcel sc = device_get_softc(dev); 454119815Smarcel 455119815Smarcel sc->sc_leaving = 1; 456119815Smarcel 457119815Smarcel UART_DETACH(sc); 458119815Smarcel 459119815Smarcel if (sc->sc_sysdev != NULL && sc->sc_sysdev->detach != NULL) 460119815Smarcel (*sc->sc_sysdev->detach)(sc); 461119815Smarcel else 462119815Smarcel uart_tty_detach(sc); 463119815Smarcel 464119815Smarcel free(sc->sc_txbuf, M_UART); 465119815Smarcel free(sc->sc_rxbuf, M_UART); 466119815Smarcel 467119815Smarcel if (sc->sc_ires != NULL) { 468119815Smarcel bus_teardown_intr(dev, sc->sc_ires, sc->sc_icookie); 469119815Smarcel bus_release_resource(dev, SYS_RES_IRQ, sc->sc_irid, 470119815Smarcel sc->sc_ires); 471119815Smarcel } 472119815Smarcel bus_release_resource(dev, sc->sc_rtype, sc->sc_rrid, sc->sc_rres); 473119815Smarcel 474143025Smarius mtx_destroy(&sc->sc_hwmtx); 475143025Smarius 476119815Smarcel if (sc->sc_class->size > sizeof(*sc)) { 477119815Smarcel device_set_softc(dev, NULL); 478119815Smarcel free(sc, M_UART); 479119815Smarcel } else 480119815Smarcel device_set_softc(dev, NULL); 481119815Smarcel 482119815Smarcel return (0); 483119815Smarcel} 484