/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* Copyright (c) 1990, 1991 UNIX System Laboratories, Inc. */ /* Copyright (c) 1984, 1986, 1987, 1988, 1989, 1990 AT&T */ /* All Rights Reserved */ /* * Copyright 2006 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ #pragma ident "%Z%%M% %I% %E% SMI" /* * Serial I/O driver for 82510/8250/16450/16550AF chips. * Modified as sparc keyboard/mouse driver. */ #define SU_REGISTER_FILE_NO 0 #define SU_REGOFFSET 0 #define SU_REGISTER_LEN 8 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef DEBUG #include #endif #include #include #include #include #include #include #define async_stopc async_ttycommon.t_stopc #define async_startc async_ttycommon.t_startc #define ASY_INIT 1 #define ASY_NOINIT 0 #ifdef DEBUG #define ASY_DEBUG_INIT 0x001 #define ASY_DEBUG_INPUT 0x002 #define ASY_DEBUG_EOT 0x004 #define ASY_DEBUG_CLOSE 0x008 #define ASY_DEBUG_HFLOW 0x010 #define ASY_DEBUG_PROCS 0x020 #define ASY_DEBUG_STATE 0x040 #define ASY_DEBUG_INTR 0x080 static int asydebug = 0; #endif static int su_log = 0; int su_drain_check = 15000000; /* tunable: exit drain check time */ static struct ppsclockev asy_ppsev; static int max_asy_instance = -1; static void *su_asycom; /* soft state asycom pointer */ static void *su_asyncline; /* soft state asyncline pointer */ static boolean_t abort_charseq_recognize(uchar_t ch); static uint_t asysoftintr(caddr_t intarg); static uint_t asyintr(caddr_t argasy); /* The async interrupt entry points */ static void async_txint(struct asycom *asy, uchar_t lsr); static void async_rxint(struct asycom *asy, uchar_t lsr); static void async_msint(struct asycom *asy); static int async_softint(struct asycom *asy); static void async_ioctl(struct asyncline *async, queue_t *q, mblk_t *mp, boolean_t iswput); static void async_reioctl(void *); static void async_iocdata(queue_t *q, mblk_t *mp); static void async_restart(void *); static void async_start(struct asyncline *async); static void async_nstart(struct asyncline *async, int mode); static void async_resume(struct asyncline *async); static int asy_program(struct asycom *asy, int mode); static int asymctl(struct asycom *, int, int); static int asytodm(int, int); static int dmtoasy(int); static void asycheckflowcontrol_hw(struct asycom *asy); static boolean_t asycheckflowcontrol_sw(struct asycom *asy); static void asy_ppsevent(struct asycom *asy, int msr); extern kcondvar_t lbolt_cv; extern int ddi_create_internal_pathname(dev_info_t *dip, char *name, int spec_type, minor_t minor_num); /* * Baud rate table. Indexed by #defines found in sys/termios.h */ ushort_t asyspdtab[] = { 0, /* 0 baud rate */ 0x900, /* 50 baud rate */ 0x600, /* 75 baud rate */ 0x417, /* 110 baud rate (%0.026) */ 0x359, /* 134 baud rate (%0.058) */ 0x300, /* 150 baud rate */ 0x240, /* 200 baud rate */ 0x180, /* 300 baud rate */ 0x0c0, /* 600 baud rate */ 0x060, /* 1200 baud rate */ 0x040, /* 1800 baud rate */ 0x030, /* 2400 baud rate */ 0x018, /* 4800 baud rate */ 0x00c, /* 9600 baud rate */ 0x006, /* 19200 baud rate */ 0x003, /* 38400 baud rate */ 0x002, /* 57600 baud rate */ 0, /* 76800 baud rate - not supported */ 0x001, /* 115200 baud rate */ 0, /* 153600 baud rate - not supported */ 0x8002, /* 230400 baud rate - supported on specific platforms */ 0, /* 307200 baud rate - not supported */ 0x8001 /* 460800 baud rate - supported on specific platforms */ }; /* * Number of speeds supported is the number of entries in * the above table. */ #define N_SU_SPEEDS (sizeof (asyspdtab)/sizeof (ushort_t)) /* * Human-readable baud rate table. * Indexed by #defines found in sys/termios.h */ int baudtable[] = { 0, /* 0 baud rate */ 50, /* 50 baud rate */ 75, /* 75 baud rate */ 110, /* 110 baud rate */ 134, /* 134 baud rate */ 150, /* 150 baud rate */ 200, /* 200 baud rate */ 300, /* 300 baud rate */ 600, /* 600 baud rate */ 1200, /* 1200 baud rate */ 1800, /* 1800 baud rate */ 2400, /* 2400 baud rate */ 4800, /* 4800 baud rate */ 9600, /* 9600 baud rate */ 19200, /* 19200 baud rate */ 38400, /* 38400 baud rate */ 57600, /* 57600 baud rate */ 76800, /* 76800 baud rate */ 115200, /* 115200 baud rate */ 153600, /* 153600 baud rate */ 230400, /* 230400 baud rate */ 307200, /* 307200 baud rate */ 460800 /* 460800 baud rate */ }; static int asyopen(queue_t *rq, dev_t *dev, int flag, int sflag, cred_t *cr); static int asyclose(queue_t *q, int flag); static void asywput(queue_t *q, mblk_t *mp); static void asyrsrv(queue_t *q); struct module_info asy_info = { 0, "su", 0, INFPSZ, 32*4096, 4096 }; static struct qinit asy_rint = { putq, (int (*)())asyrsrv, asyopen, asyclose, NULL, &asy_info, NULL }; static struct qinit asy_wint = { (int (*)())asywput, NULL, NULL, NULL, NULL, &asy_info, NULL }; struct streamtab asy_str_info = { &asy_rint, &asy_wint, NULL, NULL }; static int asyinfo(dev_info_t *dip, ddi_info_cmd_t infocmd, void *arg, void **result); static int asyprobe(dev_info_t *); static int asyattach(dev_info_t *, ddi_attach_cmd_t); static int asydetach(dev_info_t *, ddi_detach_cmd_t); static struct cb_ops cb_asy_ops = { nodev, /* cb_open */ nodev, /* cb_close */ nodev, /* cb_strategy */ nodev, /* cb_print */ nodev, /* cb_dump */ nodev, /* cb_read */ nodev, /* cb_write */ nodev, /* cb_ioctl */ nodev, /* cb_devmap */ nodev, /* cb_mmap */ nodev, /* cb_segmap */ nochpoll, /* cb_chpoll */ ddi_prop_op, /* cb_prop_op */ &asy_str_info, /* cb_stream */ D_MP /* cb_flag */ }; struct dev_ops asy_ops = { DEVO_REV, /* devo_rev */ 0, /* devo_refcnt */ asyinfo, /* devo_getinfo */ nulldev, /* devo_identify */ asyprobe, /* devo_probe */ asyattach, /* devo_attach */ asydetach, /* devo_detach */ nodev, /* devo_reset */ &cb_asy_ops, /* devo_cb_ops */ }; /* * Module linkage information for the kernel. */ static struct modldrv modldrv = { &mod_driverops, /* Type of module. This one is a driver */ "su driver %I%", &asy_ops, /* driver ops */ }; static struct modlinkage modlinkage = { MODREV_1, &modldrv, NULL }; int _init(void) { int status; status = ddi_soft_state_init(&su_asycom, sizeof (struct asycom), SU_INITIAL_SOFT_ITEMS); if (status != 0) return (status); status = ddi_soft_state_init(&su_asyncline, sizeof (struct asyncline), SU_INITIAL_SOFT_ITEMS); if (status != 0) { ddi_soft_state_fini(&su_asycom); return (status); } if ((status = mod_install(&modlinkage)) != 0) { ddi_soft_state_fini(&su_asycom); ddi_soft_state_fini(&su_asyncline); } return (status); } int _fini(void) { int i; i = mod_remove(&modlinkage); if (i == 0) { ddi_soft_state_fini(&su_asycom); ddi_soft_state_fini(&su_asyncline); } return (i); } int _info(struct modinfo *modinfop) { return (mod_info(&modlinkage, modinfop)); } static int asyprobe(dev_info_t *devi) { int instance; ddi_acc_handle_t handle; uchar_t *addr; ddi_device_acc_attr_t attr; attr.devacc_attr_version = DDI_DEVICE_ATTR_V0; attr.devacc_attr_endian_flags = DDI_STRUCTURE_LE_ACC; attr.devacc_attr_dataorder = DDI_STRICTORDER_ACC; if (ddi_regs_map_setup(devi, SU_REGISTER_FILE_NO, (caddr_t *)&addr, SU_REGOFFSET, SU_REGISTER_LEN, &attr, &handle) != DDI_SUCCESS) { cmn_err(CE_WARN, "asyprobe regs map setup failed"); return (DDI_PROBE_FAILURE); } #ifdef DEBUG if (asydebug) printf("Probe address mapped %p\n", (void *)addr); #endif /* * Probe for the device: * Ser. int. uses bits 0,1,2; FIFO uses 3,6,7; 4,5 wired low. * If bit 4 or 5 appears on inb() ISR, board is not there. */ if (ddi_get8(handle, addr+ISR) & 0x30) return (DDI_PROBE_FAILURE); instance = ddi_get_instance(devi); if (max_asy_instance < instance) max_asy_instance = instance; ddi_regs_map_free(&handle); return (DDI_PROBE_SUCCESS); /* hw is present */ } static int asydetach(dev_info_t *devi, ddi_detach_cmd_t cmd) { register int instance; struct asycom *asy; struct asyncline *async; char name[16]; instance = ddi_get_instance(devi); /* find out which unit */ asy = (struct asycom *)ddi_get_soft_state(su_asycom, instance); async = (struct asyncline *)ddi_get_soft_state(su_asyncline, instance); switch (cmd) { case DDI_DETACH: break; case DDI_SUSPEND: /* grab both mutex locks */ mutex_enter(asy->asy_excl); mutex_enter(asy->asy_excl_hi); if (asy->suspended) { mutex_exit(asy->asy_excl_hi); mutex_exit(asy->asy_excl); return (DDI_SUCCESS); } asy->suspended = B_TRUE; /* Disable further interrupts */ OUTB(ICR, 0); mutex_exit(asy->asy_excl_hi); mutex_exit(asy->asy_excl); return (DDI_SUCCESS); default: return (DDI_FAILURE); } #ifdef DEBUG if (asydebug & ASY_DEBUG_INIT) cmn_err(CE_NOTE, "su%d: ASY%s shutdown.", instance, asy->asy_hwtype == ASY82510 ? "82510" : asy->asy_hwtype == ASY16550AF ? "16550AF" : "8250"); #endif /* * Before removing interrupts it is always better to disable * interrupts if the chip gives a provision to disable the * serial port interrupts. */ mutex_enter(asy->asy_excl); mutex_enter(asy->asy_excl_hi); OUTB(ICR, 0); /* disables interrupt */ mutex_exit(asy->asy_excl_hi); mutex_exit(asy->asy_excl); /* remove minor device node(s) for this device */ (void) sprintf(name, "%c", (instance+'a')); /* serial-port */ ddi_remove_minor_node(devi, name); (void) sprintf(name, "%c,cu", (instance+'a')); /* serial-port:dailout */ ddi_remove_minor_node(devi, name); mutex_destroy(asy->asy_excl); mutex_destroy(asy->asy_excl_hi); kmem_free(asy->asy_excl, sizeof (kmutex_t)); kmem_free(asy->asy_excl_hi, sizeof (kmutex_t)); cv_destroy(&async->async_flags_cv); kstat_delete(asy->sukstat); ddi_remove_intr(devi, 0, asy->asy_iblock); ddi_regs_map_free(&asy->asy_handle); ddi_remove_softintr(asy->asy_softintr_id); mutex_destroy(asy->asy_soft_lock); kmem_free(asy->asy_soft_lock, sizeof (kmutex_t)); ddi_soft_state_free(su_asycom, instance); ddi_soft_state_free(su_asyncline, instance); return (DDI_SUCCESS); } static int asyattach(dev_info_t *devi, ddi_attach_cmd_t cmd) { register int instance; struct asycom *asy; struct asyncline *async; char name[40]; ddi_device_acc_attr_t attr; enum states { EMPTY, SOFTSTATE, REGSMAP, MUTEXES, ADDINTR, SOFTINTR, ASYINIT, KSTAT, MINORNODE }; enum states state = EMPTY; instance = ddi_get_instance(devi); /* find out which unit */ /* cannot attach a device that has not been probed first */ if (instance > max_asy_instance) return (DDI_FAILURE); if (cmd != DDI_RESUME) { /* Allocate soft state space */ if (ddi_soft_state_zalloc(su_asycom, instance) != DDI_SUCCESS) { cmn_err(CE_WARN, "su%d: cannot allocate soft state", instance); goto error; } } state = SOFTSTATE; asy = (struct asycom *)ddi_get_soft_state(su_asycom, instance); if (asy == NULL) { cmn_err(CE_WARN, "su%d: cannot get soft state", instance); goto error; } switch (cmd) { case DDI_ATTACH: break; case DDI_RESUME: { struct asyncline *async; /* grab both mutex locks */ mutex_enter(asy->asy_excl); mutex_enter(asy->asy_excl_hi); if (!asy->suspended) { mutex_exit(asy->asy_excl_hi); mutex_exit(asy->asy_excl); return (DDI_SUCCESS); } /* re-setup all the registers and enable interrupts if needed */ async = (struct asyncline *)asy->asy_priv; if ((async) && (async->async_flags & ASYNC_ISOPEN)) (void) asy_program(asy, ASY_INIT); asy->suspended = B_FALSE; mutex_exit(asy->asy_excl_hi); mutex_exit(asy->asy_excl); return (DDI_SUCCESS); } default: goto error; } attr.devacc_attr_version = DDI_DEVICE_ATTR_V0; attr.devacc_attr_endian_flags = DDI_STRUCTURE_LE_ACC; attr.devacc_attr_dataorder = DDI_STRICTORDER_ACC; if (ddi_regs_map_setup(devi, SU_REGISTER_FILE_NO, (caddr_t *)&asy->asy_ioaddr, SU_REGOFFSET, SU_REGISTER_LEN, &attr, &asy->asy_handle) != DDI_SUCCESS) { cmn_err(CE_WARN, "asyprobe regs map setup failed"); goto error; } state = REGSMAP; #ifdef DEBUG if (asydebug) printf("su attach mapped %p\n", (void *)asy->asy_ioaddr); #endif /* * Initialize the port with default settings. */ asy->asy_fifo_buf = 1; asy->asy_use_fifo = FIFO_OFF; /* * Check for baudrate generator's "baud-divisor-factor" property setup * by OBP, since different UART chips might have different baudrate * generator divisor. e.g., in case of NSPG's Sputnik platform, the * baud-divisor-factor is 13, it uses dedicated 16552 "DUART" chip * instead of SuperIO. Since the baud-divisor-factor must be a positive * integer, the divisors will always be at least as large as the values * in asyspdtab[]. Make the default factor 1. */ asy->asy_baud_divisor_factor = ddi_prop_get_int(DDI_DEV_T_ANY, devi, DDI_PROP_DONTPASS, "baud-divisor-factor", 1); /* set speed cap */ asy->asy_speed_cap = ddi_prop_get_int(DDI_DEV_T_ANY, devi, DDI_PROP_DONTPASS, "serial-speed-cap", 115200); /* check for ASY82510 chip */ OUTB(ISR, 0x20); if (INB(ISR) & 0x20) { /* 82510 chip is present */ /* * Since most of the general operation of the 82510 chip * can be done from BANK 0 (8250A/16450 compatable mode) * we will default to BANK 0. */ asy->asy_hwtype = ASY82510; OUTB(DAT+7, 0x04); /* clear status */ OUTB(ISR, 0x40); /* set to bank 2 */ OUTB(MCR, 0x08); /* IMD */ OUTB(DAT, 0x21); /* FMD */ OUTB(ISR, 0x00); /* set to bank 0 */ asy->asy_trig_level = 0; } else { /* Set the UART in FIFO mode if it has FIFO buffers */ asy->asy_hwtype = ASY16550AF; OUTB(FIFOR, 0x00); /* clear fifo register */ asy->asy_trig_level = 0x00; /* sets the fifo Threshold to 1 */ /* set/Enable FIFO */ OUTB(FIFOR, FIFO_ON | FIFODMA | FIFOTXFLSH | FIFORXFLSH | (asy->asy_trig_level & 0xff)); if ((INB(ISR) & 0xc0) == 0xc0) asy->asy_use_fifo = FIFO_ON; else { asy->asy_hwtype = ASY8250; OUTB(FIFOR, 0x00); /* NO FIFOs */ asy->asy_trig_level = 0; } } OUTB(ICR, 0); /* disable all interrupts */ OUTB(LCR, DLAB); /* select baud rate generator */ /* Set the baud rate to 9600 */ OUTB(DAT+DLL, (ASY9600*asy->asy_baud_divisor_factor) & 0xff); OUTB(DAT+DLH, ((ASY9600*asy->asy_baud_divisor_factor) >> 8) & 0xff); OUTB(LCR, STOP1|BITS8); OUTB(MCR, (DTR | RTS| OUT2)); /* * Set up the other components of the asycom structure for this port. */ asy->asy_excl = (kmutex_t *) kmem_zalloc(sizeof (kmutex_t), KM_SLEEP); asy->asy_excl_hi = (kmutex_t *) kmem_zalloc(sizeof (kmutex_t), KM_SLEEP); asy->asy_soft_lock = (kmutex_t *) kmem_zalloc(sizeof (kmutex_t), KM_SLEEP); asy->asy_unit = instance; asy->asy_dip = devi; if (ddi_get_iblock_cookie(devi, 0, &asy->asy_iblock) != DDI_SUCCESS) { cmn_err(CE_NOTE, "Get iblock_cookie failed-Device interrupt%x\n", instance); goto error; } if (ddi_get_soft_iblock_cookie(devi, DDI_SOFTINT_HIGH, &asy->asy_soft_iblock) != DDI_SUCCESS) { cmn_err(CE_NOTE, "Get iblock_cookie failed -soft interrupt%x\n", instance); goto error; } mutex_init(asy->asy_soft_lock, NULL, MUTEX_DRIVER, (void *)asy->asy_soft_iblock); mutex_init(asy->asy_excl, NULL, MUTEX_DRIVER, NULL); mutex_init(asy->asy_excl_hi, NULL, MUTEX_DRIVER, (void *)asy->asy_iblock); state = MUTEXES; /* * Install interrupt handlers for this device. */ if (ddi_add_intr(devi, 0, &(asy->asy_iblock), 0, asyintr, (caddr_t)asy) != DDI_SUCCESS) { cmn_err(CE_CONT, "Cannot set device interrupt for su driver\n"); goto error; } state = ADDINTR; if (ddi_add_softintr(devi, DDI_SOFTINT_HIGH, &(asy->asy_softintr_id), &asy->asy_soft_iblock, 0, asysoftintr, (caddr_t)asy) != DDI_SUCCESS) { cmn_err(CE_CONT, "Cannot set soft interrupt for su driver\n"); goto error; } state = SOFTINTR; /* initialize the asyncline structure */ if (ddi_soft_state_zalloc(su_asyncline, instance) != DDI_SUCCESS) { cmn_err(CE_CONT, "su%d: cannot allocate soft state", instance); goto error; } state = ASYINIT; async = (struct asyncline *)ddi_get_soft_state(su_asyncline, instance); mutex_enter(asy->asy_excl); async->async_common = asy; cv_init(&async->async_flags_cv, NULL, CV_DEFAULT, NULL); mutex_exit(asy->asy_excl); if ((asy->sukstat = kstat_create("su", instance, "serialstat", "misc", KSTAT_TYPE_NAMED, 2, KSTAT_FLAG_VIRTUAL)) != NULL) { asy->sukstat->ks_data = &asy->kstats; kstat_named_init(&asy->kstats.ringover, "ring buffer overflow", KSTAT_DATA_UINT64); kstat_named_init(&asy->kstats.siloover, "silo overflow", KSTAT_DATA_UINT64); kstat_install(asy->sukstat); } state = KSTAT; if (strcmp(ddi_node_name(devi), "rsc-console") == 0) { /* * If the device is configured as the 'rsc-console' * create the minor device for this node. */ if (ddi_create_minor_node(devi, "ssp", S_IFCHR, asy->asy_unit | RSC_DEVICE, DDI_PSEUDO, NULL) == DDI_FAILURE) { cmn_err(CE_WARN, "%s%d: Failed to create node rsc-console", ddi_get_name(devi), ddi_get_instance(devi)); goto error; } asy->asy_lom_console = 0; asy->asy_rsc_console = 1; asy->asy_rsc_control = 0; asy->asy_device_type = ASY_SERIAL; asy->asy_flags |= ASY_IGNORE_CD; } else if (strcmp(ddi_node_name(devi), "lom-console") == 0) { /* * If the device is configured as the 'lom-console' * create the minor device for this node. * Do not create a dialout device. * Use the same minor numbers as would be used for standard * serial instances. */ if (ddi_create_minor_node(devi, "lom-console", S_IFCHR, instance, DDI_NT_SERIAL_LOMCON, NULL) == DDI_FAILURE) { cmn_err(CE_WARN, "%s%d: Failed to create node lom-console", ddi_get_name(devi), ddi_get_instance(devi)); goto error; } asy->asy_lom_console = 1; asy->asy_rsc_console = 0; asy->asy_rsc_control = 0; asy->asy_device_type = ASY_SERIAL; asy->asy_flags |= ASY_IGNORE_CD; } else if (strcmp(ddi_node_name(devi), "rsc-control") == 0) { /* * If the device is configured as the 'rsc-control' * create the minor device for this node. */ if (ddi_create_minor_node(devi, "sspctl", S_IFCHR, asy->asy_unit | RSC_DEVICE, DDI_PSEUDO, NULL) == DDI_FAILURE) { cmn_err(CE_WARN, "%s%d: Failed to create rsc-control", ddi_get_name(devi), ddi_get_instance(devi)); goto error; } asy->asy_lom_console = 0; asy->asy_rsc_console = 0; asy->asy_rsc_control = 1; asy->asy_device_type = ASY_SERIAL; asy->asy_flags |= ASY_IGNORE_CD; } else if (ddi_getprop(DDI_DEV_T_ANY, devi, DDI_PROP_DONTPASS, "keyboard", 0)) { /* * If the device is a keyboard, then create an internal * pathname so that the dacf code will link the node into * the keyboard console stream. See dacf.conf. */ if (ddi_create_internal_pathname(devi, "keyboard", S_IFCHR, instance) == DDI_FAILURE) { goto error; } asy->asy_flags |= ASY_IGNORE_CD; /* ignore cd */ asy->asy_device_type = ASY_KEYBOARD; /* Device type */ } else if (ddi_getprop(DDI_DEV_T_ANY, devi, DDI_PROP_DONTPASS, "mouse", 0)) { /* * If the device is a mouse, then create an internal * pathname so that the dacf code will link the node into * the mouse stream. See dacf.conf. */ if (ddi_create_internal_pathname(devi, "mouse", S_IFCHR, instance) == DDI_FAILURE) { goto error; } asy->asy_flags |= ASY_IGNORE_CD; /* ignore cd */ asy->asy_device_type = ASY_MOUSE; } else { /* * If not used for keyboard/mouse, create minor devices nodes * for this device */ /* serial-port */ (void) sprintf(name, "%c", (instance+'a')); if (ddi_create_minor_node(devi, name, S_IFCHR, instance, DDI_NT_SERIAL_MB, NULL) == DDI_FAILURE) { goto error; } state = MINORNODE; /* serial-port:dailout */ (void) sprintf(name, "%c,cu", (instance+'a')); if (ddi_create_minor_node(devi, name, S_IFCHR, instance|OUTLINE, DDI_NT_SERIAL_MB_DO, NULL) == DDI_FAILURE) { goto error; } /* Property for ignoring DCD */ if (ddi_getprop(DDI_DEV_T_ANY, devi, DDI_PROP_DONTPASS, "ignore-cd", 0)) { asy->asy_flags |= ASY_IGNORE_CD; /* ignore cd */ } else { asy->asy_flags &= ~ASY_IGNORE_CD; /* * if ignore-cd is not available it could be * some old legacy platform, try to see * whether the old legacy property exists */ (void) sprintf(name, "port-%c-ignore-cd", (instance+ 'a')); if (ddi_getprop(DDI_DEV_T_ANY, devi, DDI_PROP_DONTPASS, name, 0)) asy->asy_flags |= ASY_IGNORE_CD; } asy->asy_device_type = ASY_SERIAL; } ddi_report_dev(devi); return (DDI_SUCCESS); error: if (state == MINORNODE) { (void) sprintf(name, "%c", (instance+'a')); ddi_remove_minor_node(devi, name); } if (state >= KSTAT) kstat_delete(asy->sukstat); if (state >= ASYINIT) { cv_destroy(&async->async_flags_cv); ddi_soft_state_free(su_asyncline, instance); } if (state >= SOFTINTR) ddi_remove_softintr(asy->asy_softintr_id); if (state >= ADDINTR) ddi_remove_intr(devi, 0, asy->asy_iblock); if (state >= MUTEXES) { mutex_destroy(asy->asy_excl_hi); mutex_destroy(asy->asy_excl); mutex_destroy(asy->asy_soft_lock); kmem_free(asy->asy_excl_hi, sizeof (kmutex_t)); kmem_free(asy->asy_excl, sizeof (kmutex_t)); kmem_free(asy->asy_soft_lock, sizeof (kmutex_t)); } if (state >= REGSMAP) ddi_regs_map_free(&asy->asy_handle); if (state >= SOFTSTATE) ddi_soft_state_free(su_asycom, instance); /* no action for EMPTY state */ return (DDI_FAILURE); } static int asyinfo(dev_info_t *dip, ddi_info_cmd_t infocmd, void *arg, void **result) { _NOTE(ARGUNUSED(dip)) register dev_t dev = (dev_t)arg; register int instance, error; struct asycom *asy; if ((instance = UNIT(dev)) > max_asy_instance) return (DDI_FAILURE); switch (infocmd) { case DDI_INFO_DEVT2DEVINFO: asy = (struct asycom *)ddi_get_soft_state(su_asycom, instance); if (asy->asy_dip == NULL) error = DDI_FAILURE; else { *result = (void *) asy->asy_dip; error = DDI_SUCCESS; } break; case DDI_INFO_DEVT2INSTANCE: *result = (void *)(uintptr_t)instance; error = DDI_SUCCESS; break; default: error = DDI_FAILURE; } return (error); } static int asyopen(queue_t *rq, dev_t *dev, int flag, int sflag, cred_t *cr) { _NOTE(ARGUNUSED(sflag)) struct asycom *asy; struct asyncline *async; int mcr; int unit; int len; struct termios *termiosp; #ifdef DEBUG if (asydebug & ASY_DEBUG_CLOSE) printf("open\n"); #endif unit = UNIT(*dev); if (unit > max_asy_instance) return (ENXIO); /* unit not configured */ async = (struct asyncline *)ddi_get_soft_state(su_asyncline, unit); if (async == NULL) return (ENXIO); asy = async->async_common; if (asy == NULL) return (ENXIO); /* device not found by autoconfig */ mutex_enter(asy->asy_excl); asy->asy_priv = (caddr_t)async; again: mutex_enter(asy->asy_excl_hi); /* * Block waiting for carrier to come up, unless this is a no-delay open. */ if (!(async->async_flags & ASYNC_ISOPEN)) { /* * If this port is for a RSC console or control * use the following termio info */ if (asy->asy_rsc_console || asy->asy_rsc_control) { async->async_ttycommon.t_cflag = CIBAUDEXT | CBAUDEXT | (B115200 & CBAUD); async->async_ttycommon.t_cflag |= ((B115200 << IBSHIFT) & CIBAUD); async->async_ttycommon.t_cflag |= CS8 | CREAD | CLOCAL; } else if (asy->asy_lom_console) { async->async_ttycommon.t_cflag = B9600 & CBAUD; async->async_ttycommon.t_cflag |= ((B9600 << IBSHIFT) & CIBAUD); async->async_ttycommon.t_cflag |= CS8 | CREAD | CLOCAL; } else { /* * Set the default termios settings (cflag). * Others are set in ldterm. Release the spin * mutex as we can block here, reaquire before * calling asy_program. */ mutex_exit(asy->asy_excl_hi); if (ddi_getlongprop(DDI_DEV_T_ANY, ddi_root_node(), 0, "ttymodes", (caddr_t)&termiosp, &len) == DDI_PROP_SUCCESS && len == sizeof (struct termios)) { async->async_ttycommon.t_cflag = termiosp->c_cflag; kmem_free(termiosp, len); } else { cmn_err(CE_WARN, "su: couldn't get ttymodes property!"); } mutex_enter(asy->asy_excl_hi); } async->async_ttycommon.t_iflag = 0; async->async_ttycommon.t_iocpending = NULL; async->async_ttycommon.t_size.ws_row = 0; async->async_ttycommon.t_size.ws_col = 0; async->async_ttycommon.t_size.ws_xpixel = 0; async->async_ttycommon.t_size.ws_ypixel = 0; async->async_dev = *dev; async->async_wbufcid = 0; async->async_startc = CSTART; async->async_stopc = CSTOP; (void) asy_program(asy, ASY_INIT); } else if ((async->async_ttycommon.t_flags & TS_XCLUDE) && secpolicy_excl_open(cr) != 0) { mutex_exit(asy->asy_excl_hi); mutex_exit(asy->asy_excl); return (EBUSY); } else if ((*dev & OUTLINE) && !(async->async_flags & ASYNC_OUT)) { mutex_exit(asy->asy_excl_hi); mutex_exit(asy->asy_excl); return (EBUSY); } if (*dev & OUTLINE) async->async_flags |= ASYNC_OUT; /* Raise DTR on every open */ mcr = INB(MCR); OUTB(MCR, mcr|DTR); /* * Check carrier. */ if (asy->asy_flags & ASY_IGNORE_CD) async->async_ttycommon.t_flags |= TS_SOFTCAR; if ((async->async_ttycommon.t_flags & TS_SOFTCAR) || (INB(MSR) & DCD)) async->async_flags |= ASYNC_CARR_ON; else async->async_flags &= ~ASYNC_CARR_ON; mutex_exit(asy->asy_excl_hi); /* * If FNDELAY and FNONBLOCK are clear, block until carrier up. * Quit on interrupt. */ if (!(flag & (FNDELAY|FNONBLOCK)) && !(async->async_ttycommon.t_cflag & CLOCAL)) { if (!(async->async_flags & (ASYNC_CARR_ON|ASYNC_OUT)) || ((async->async_flags & ASYNC_OUT) && !(*dev & OUTLINE))) { async->async_flags |= ASYNC_WOPEN; if (cv_wait_sig(&async->async_flags_cv, asy->asy_excl) == 0) { async->async_flags &= ~ASYNC_WOPEN; mutex_exit(asy->asy_excl); return (EINTR); } async->async_flags &= ~ASYNC_WOPEN; goto again; } } else if ((async->async_flags & ASYNC_OUT) && !(*dev & OUTLINE)) { mutex_exit(asy->asy_excl); return (EBUSY); } if (asy->suspended) { mutex_exit(asy->asy_excl); (void) ddi_dev_is_needed(asy->asy_dip, 0, 1); mutex_enter(asy->asy_excl); } async->async_ttycommon.t_readq = rq; async->async_ttycommon.t_writeq = WR(rq); rq->q_ptr = WR(rq)->q_ptr = (caddr_t)async; mutex_exit(asy->asy_excl); qprocson(rq); async->async_flags |= ASYNC_ISOPEN; async->async_polltid = 0; return (0); } static void async_progress_check(void *arg) { struct asyncline *async = arg; struct asycom *asy = async->async_common; mblk_t *bp; /* * We define "progress" as either waiting on a timed break or delay, or * having had at least one transmitter interrupt. If none of these are * true, then just terminate the output and wake up that close thread. */ mutex_enter(asy->asy_excl); mutex_enter(asy->asy_excl_hi); if (!(async->async_flags & (ASYNC_BREAK|ASYNC_DELAY|ASYNC_PROGRESS))) { async->async_ocnt = 0; async->async_flags &= ~ASYNC_BUSY; async->async_timer = 0; bp = async->async_xmitblk; async->async_xmitblk = NULL; mutex_exit(asy->asy_excl_hi); if (bp != NULL) freeb(bp); /* * Since this timer is running, we know that we're in exit(2). * That means that the user can't possibly be waiting on any * valid ioctl(2) completion anymore, and we should just flush * everything. */ flushq(async->async_ttycommon.t_writeq, FLUSHALL); cv_broadcast(&async->async_flags_cv); } else { async->async_flags &= ~ASYNC_PROGRESS; async->async_timer = timeout(async_progress_check, async, drv_usectohz(su_drain_check)); mutex_exit(asy->asy_excl_hi); } mutex_exit(asy->asy_excl); } /* * Close routine. */ static int asyclose(queue_t *q, int flag) { struct asyncline *async; struct asycom *asy; int icr, lcr; int nohupcl; #ifdef DEBUG if (asydebug & ASY_DEBUG_CLOSE) printf("close\n"); #endif async = q->q_ptr; ASSERT(async != NULL); asy = async->async_common; /* get the nohupcl OBP property of this device */ nohupcl = ddi_getprop(DDI_DEV_T_ANY, asy->asy_dip, DDI_PROP_DONTPASS, "nohupcl", 0); mutex_enter(asy->asy_excl); async->async_flags |= ASYNC_CLOSING; /* * Turn off PPS handling early to avoid events occuring during * close. Also reset the DCD edge monitoring bit. */ mutex_enter(asy->asy_excl_hi); asy->asy_flags &= ~(ASY_PPS | ASY_PPS_EDGE); mutex_exit(asy->asy_excl_hi); /* * There are two flavors of break -- timed (M_BREAK or TCSBRK) and * untimed (TIOCSBRK). For the timed case, these are enqueued on our * write queue and there's a timer running, so we don't have to worry * about them. For the untimed case, though, the user obviously made a * mistake, because these are handled immediately. We'll terminate the * break now and honor his implicit request by discarding the rest of * the data. */ if (!(async->async_flags & ASYNC_BREAK)) { mutex_enter(asy->asy_excl_hi); lcr = INB(LCR); if (lcr & SETBREAK) { OUTB(LCR, (lcr & ~SETBREAK)); } mutex_exit(asy->asy_excl_hi); if (lcr & SETBREAK) goto nodrain; } /* * If the user told us not to delay the close ("non-blocking"), then * don't bother trying to drain. * * If the user did M_STOP (ASYNC_STOPPED), there's no hope of ever * getting an M_START (since these messages aren't enqueued), and the * only other way to clear the stop condition is by loss of DCD, which * would discard the queue data. Thus, we drop the output data if * ASYNC_STOPPED is set. */ if ((flag & (FNDELAY|FNONBLOCK)) || (async->async_flags & ASYNC_STOPPED)) { goto nodrain; } /* * If there's any pending output, then we have to try to drain it. * There are two main cases to be handled: * - called by close(2): need to drain until done or until * a signal is received. No timeout. * - called by exit(2): need to drain while making progress * or until a timeout occurs. No signals. * * If we can't rely on receiving a signal to get us out of a hung * session, then we have to use a timer. In this case, we set a timer * to check for progress in sending the output data -- all that we ask * (at each interval) is that there's been some progress made. Since * the interrupt routine grabs buffers from the write queue, we can't * trust async_ocnt. Instead, we use a flag. * * Note that loss of carrier will cause the output queue to be flushed, * and we'll wake up again and finish normally. */ if (!ddi_can_receive_sig() && su_drain_check != 0) { async->async_flags &= ~ASYNC_PROGRESS; async->async_timer = timeout(async_progress_check, async, drv_usectohz(su_drain_check)); } while (async->async_ocnt > 0 || async->async_ttycommon.t_writeq->q_first != NULL || (async->async_flags & (ASYNC_BUSY|ASYNC_BREAK|ASYNC_DELAY))) { if (cv_wait_sig(&async->async_flags_cv, asy->asy_excl) == 0) break; } if (async->async_timer != 0) { (void) untimeout(async->async_timer); async->async_timer = 0; } nodrain: mutex_enter(asy->asy_excl_hi); /* turn off the loopback mode */ if ((async->async_dev != rconsdev) && (async->async_dev != kbddev) && (async->async_dev != stdindev)) { OUTB(MCR, INB(MCR) & ~ ASY_LOOP); } async->async_ocnt = 0; if (async->async_xmitblk != NULL) freeb(async->async_xmitblk); async->async_xmitblk = NULL; /* * If the "nohupcl" OBP property is set for this device, do * not turn off DTR and RTS no matter what. Otherwise, if the * line has HUPCL set or is incompletely opened, turn off DTR * and RTS to fix the modem line. */ if (!nohupcl && ((async->async_ttycommon.t_cflag & HUPCL) || (async->async_flags & ASYNC_WOPEN))) { /* turn off DTR, RTS but NOT interrupt to 386 */ OUTB(MCR, OUT2); mutex_exit(asy->asy_excl_hi); /* * Don't let an interrupt in the middle of close * bounce us back to the top; just continue closing * as if nothing had happened. */ if (cv_wait_sig(&lbolt_cv, asy->asy_excl) == 0) goto out; mutex_enter(asy->asy_excl_hi); } /* * If nobody's using it now, turn off receiver interrupts. */ if ((async->async_flags & (ASYNC_WOPEN|ASYNC_ISOPEN)) == 0) { icr = INB(ICR); OUTB(ICR, (icr & ~RIEN)); } mutex_exit(asy->asy_excl_hi); out: /* * Clear out device state. */ async->async_flags = 0; ttycommon_close(&async->async_ttycommon); cv_broadcast(&async->async_flags_cv); /* * Clear ASY_DOINGSOFT and ASY_NEEDSOFT in case we were in * async_softint or an interrupt was pending when the process * using the port exited. */ asy->asy_flags &= ~ASY_DOINGSOFT & ~ASY_NEEDSOFT; /* * Cancel outstanding "bufcall" request. */ if (async->async_wbufcid) { unbufcall(async->async_wbufcid); async->async_wbufcid = 0; } /* * If inperim is true, it means the port is closing while there's * a pending software interrupt. async_flags has been zeroed out, * so this instance of leaveq() needs to be called before we call * qprocsoff() to disable services on the q. If inperim is false, * leaveq() has already been called or we're not in a perimeter. */ if (asy->inperim == B_TRUE) { asy->inperim = B_FALSE; mutex_exit(asy->asy_excl); leaveq(q); } else { mutex_exit(asy->asy_excl); } /* Note that qprocsoff can't be done until after interrupts are off */ qprocsoff(q); q->q_ptr = WR(q)->q_ptr = NULL; async->async_ttycommon.t_readq = NULL; async->async_ttycommon.t_writeq = NULL; return (0); } /* * Checks to see if the serial port is still transmitting * characters. It returns true when there are characters * queued to transmit, when the holding register contains * a byte, or when the shifting register still contains * data to send. * */ static boolean_t asy_isbusy(struct asycom *asy) { struct asyncline *async; #ifdef DEBUG if (asydebug & ASY_DEBUG_EOT) printf("isbusy\n"); #endif async = (struct asyncline *)asy->asy_priv; ASSERT(mutex_owned(asy->asy_excl)); ASSERT(mutex_owned(asy->asy_excl_hi)); return ((async->async_ocnt > 0) || ((INB(LSR) & XSRE) == 0)); } /* * Program the ASY port. Most of the async operation is based on the values * of 'c_iflag' and 'c_cflag'. */ static int asy_program(struct asycom *asy, int mode) { struct asyncline *async; int baudrate, c_flag; int icr, lcr; int ocflags; int error = 0; ASSERT(mutex_owned(asy->asy_excl)); ASSERT(mutex_owned(asy->asy_excl_hi)); #ifdef DEBUG if (asydebug & ASY_DEBUG_PROCS) printf("program\n"); #endif async = (struct asyncline *)asy->asy_priv; baudrate = async->async_ttycommon.t_cflag & CBAUD; if (async->async_ttycommon.t_cflag & CBAUDEXT) baudrate += 16; /* Limit baudrate so it can't index out of baudtable */ if (baudrate >= N_SU_SPEEDS) baudrate = B9600; /* * If baud rate requested is greater than the speed cap * or is an unsupported baud rate then reset t_cflag baud * to the last valid baud rate. If this is the initial * pass through asy_program then set it to 9600. */ if (((baudrate > 0) && (asyspdtab[baudrate] == 0)) || (baudtable[baudrate] > asy->asy_speed_cap)) { async->async_ttycommon.t_cflag &= ~CBAUD & ~CBAUDEXT & ~CIBAUD & ~CIBAUDEXT; if (mode == ASY_INIT) { async->async_ttycommon.t_cflag |= B9600; baudrate = B9600; } else { async->async_ttycommon.t_cflag |= (asy->asy_ocflags & (CBAUD | CBAUDEXT | CIBAUD | CIBAUDEXT)); } error = EINVAL; goto end; } /* set the baud rate */ if (async->async_ttycommon.t_cflag & (CIBAUD|CIBAUDEXT)) { async->async_ttycommon.t_cflag &= ~(CIBAUD); if (baudrate > CBAUD) { async->async_ttycommon.t_cflag |= CIBAUDEXT; async->async_ttycommon.t_cflag |= (((baudrate - CBAUD -1)<< IBSHIFT) & CIBAUD); } else { async->async_ttycommon.t_cflag &= ~CIBAUDEXT; async->async_ttycommon.t_cflag |= ((baudrate << IBSHIFT) & CIBAUD); } } c_flag = async->async_ttycommon.t_cflag & (CLOCAL | CREAD | CSTOPB | CSIZE | PARENB | PARODD | CBAUD | CBAUDEXT | CIBAUD | CIBAUDEXT); OUTB(ICR, 0); /* disable interrupts */ ocflags = asy->asy_ocflags; /* flush/reset the status registers */ if (mode == ASY_INIT) { (void) INB(DAT); (void) INB(ISR); (void) INB(LSR); (void) INB(MSR); } if (ocflags != (c_flag & ~CLOCAL) || mode == ASY_INIT) { /* Set line control */ lcr = INB(LCR); lcr &= ~(WLS0|WLS1|STB|PEN|EPS); if (c_flag & CSTOPB) lcr |= STB; /* 2 stop bits */ if (c_flag & PARENB) lcr |= PEN; if ((c_flag & PARODD) == 0) lcr |= EPS; switch (c_flag & CSIZE) { case CS5: lcr |= BITS5; break; case CS6: lcr |= BITS6; break; case CS7: lcr |= BITS7; break; case CS8: lcr |= BITS8; break; } /* set the baud rate when the rate is NOT B0 */ if (baudrate != 0) { OUTB(LCR, DLAB); OUTB(DAT, (asyspdtab[baudrate] * asy->asy_baud_divisor_factor) & 0xff); OUTB(ICR, ((asyspdtab[baudrate] * asy->asy_baud_divisor_factor) >> 8) & 0xff); } /* set the line control modes */ OUTB(LCR, lcr); /* * if transitioning from CREAD off to CREAD on, * flush the FIFO buffer if we have one. */ if ((ocflags & CREAD) == 0 && (c_flag & CREAD)) { if (asy->asy_use_fifo == FIFO_ON) { OUTB(FIFOR, FIFO_ON | FIFODMA | FIFORXFLSH | (asy->asy_trig_level & 0xff)); } } /* remember the new cflags */ asy->asy_ocflags = c_flag & ~CLOCAL; } /* whether or not CLOCAL is set, modify the modem control lines */ if (baudrate == 0) /* B0 has been issued, lower DTR */ OUTB(MCR, RTS|OUT2); else /* raise DTR */ OUTB(MCR, DTR|RTS|OUT2); /* * Call the modem status interrupt handler to check for the carrier * in case CLOCAL was turned off after the carrier came on. * (Note: Modem status interrupt is not enabled if CLOCAL is ON.) */ async_msint(asy); /* Set interrupt control */ if ((c_flag & CLOCAL) && !(async->async_ttycommon.t_cflag & CRTSCTS)) /* * direct-wired line ignores DCD, so we don't enable modem * status interrupts. */ icr = (TIEN | SIEN); else icr = (TIEN | SIEN | MIEN); if (c_flag & CREAD) icr |= RIEN; OUTB(ICR, icr); end: return (error); } /* * asyintr() is the High Level Interrupt Handler. * * There are four different interrupt types indexed by ISR register values: * 0: modem * 1: Tx holding register is empty, ready for next char * 2: Rx register now holds a char to be picked up * 3: error or break on line * This routine checks the Bit 0 (interrupt-not-pending) to determine if * the interrupt is from this port. */ uint_t asyintr(caddr_t argasy) { struct asycom *asy = (struct asycom *)argasy; struct asyncline *async; int ret_status = DDI_INTR_UNCLAIMED; uchar_t interrupt_id, lsr; interrupt_id = INB(ISR) & 0x0F; async = (struct asyncline *)asy->asy_priv; if ((async == NULL) || !(async->async_flags & (ASYNC_ISOPEN|ASYNC_WOPEN))) { if (interrupt_id & NOINTERRUPT) { return (DDI_INTR_UNCLAIMED); } else { lsr = INB(LSR); if ((lsr & BRKDET) && ((abort_enable == KIOCABORTENABLE) && (async->async_dev == rconsdev))) abort_sequence_enter((char *)NULL); else { /* reset line status */ (void) INB(LSR); /* discard any data */ (void) INB(DAT); /* reset modem status */ (void) INB(MSR); return (DDI_INTR_CLAIMED); } } } /* * Spurious interrupts happen in this driver * because of the transmission on serial port not handled * properly. * * The reasons for Spurious interrupts are: * 1. There is a path in async_nstart which transmits * characters without going through interrupt services routine * which causes spurious interrupts to happen. * 2. In the async_txint more than one character is sent * in one interrupt service. * 3. In async_rxint more than one characters are received in * in one interrupt service. * * Hence we have flags to indicate that such scenerio has happened. * and claim only such interrupts and others we donot claim it * as it could be a indicator of some hardware problem. * */ if (interrupt_id & NOINTERRUPT) { mutex_enter(asy->asy_excl_hi); if ((asy->asy_xmit_count > 1) || (asy->asy_out_of_band_xmit > 0) || (asy->asy_rx_count > 1)) { asy->asy_xmit_count = 0; asy->asy_out_of_band_xmit = 0; asy->asy_rx_count = 0; mutex_exit(asy->asy_excl_hi); return (DDI_INTR_CLAIMED); } else { mutex_exit(asy->asy_excl_hi); return (DDI_INTR_UNCLAIMED); } } ret_status = DDI_INTR_CLAIMED; mutex_enter(asy->asy_excl_hi); if (asy->asy_hwtype == ASY82510) OUTB(ISR, 0x00); /* set bank 0 */ #ifdef DEBUG if (asydebug & ASY_DEBUG_INTR) prom_printf("l"); #endif lsr = INB(LSR); switch (interrupt_id) { case RxRDY: case RSTATUS: case FFTMOUT: /* receiver interrupt or receiver errors */ async_rxint(asy, lsr); break; case TxRDY: /* transmit interrupt */ async_txint(asy, lsr); break; case MSTATUS: /* modem status interrupt */ async_msint(asy); break; } mutex_exit(asy->asy_excl_hi); return (ret_status); } /* * Transmitter interrupt service routine. * If there is more data to transmit in the current pseudo-DMA block, * send the next character if output is not stopped or draining. * Otherwise, queue up a soft interrupt. * * XXX - Needs review for HW FIFOs. */ static void async_txint(struct asycom *asy, uchar_t lsr) { struct asyncline *async = (struct asyncline *)asy->asy_priv; int fifo_len; int xmit_progress; asycheckflowcontrol_hw(asy); /* * If ASYNC_BREAK has been set, return to asyintr()'s context to * claim the interrupt without performing any action. */ if (async->async_flags & ASYNC_BREAK) return; fifo_len = asy->asy_fifo_buf; /* with FIFO buffers */ /* * Check for flow control and do the needed action. */ if (asycheckflowcontrol_sw(asy)) { return; } if (async->async_ocnt > 0 && !(async->async_flags & (ASYNC_HW_OUT_FLW|ASYNC_STOPPED))) { xmit_progress = 0; while (fifo_len > 0 && async->async_ocnt > 0) { if (lsr & XHRE) { OUTB(DAT, *async->async_optr++); fifo_len--; async->async_ocnt--; xmit_progress++; } /* * Reading the lsr, (moved reading at the end of * while loop) as already we have read once at * the beginning of interrupt service */ lsr = INB(LSR); } asy->asy_xmit_count = xmit_progress; if (xmit_progress > 0) async->async_flags |= ASYNC_PROGRESS; } if (fifo_len == 0) { return; } ASYSETSOFT(asy); } /* * Receiver interrupt: RxRDY interrupt, FIFO timeout interrupt or receive * error interrupt. * Try to put the character into the circular buffer for this line; if it * overflows, indicate a circular buffer overrun. If this port is always * to be serviced immediately, or the character is a STOP character, or * more than 15 characters have arrived, queue up a soft interrupt to * drain the circular buffer. * XXX - needs review for hw FIFOs support. */ static void async_rxint(struct asycom *asy, uchar_t lsr) { struct asyncline *async = (struct asyncline *)asy->asy_priv; uchar_t c = 0; uint_t s = 0, needsoft = 0; register tty_common_t *tp; tp = &async->async_ttycommon; if (!(tp->t_cflag & CREAD)) { if (lsr & (RCA|PARERR|FRMERR|BRKDET|OVRRUN)) { (void) (INB(DAT) & 0xff); } return; /* line is not open for read? */ } asy->asy_rx_count = 0; while (lsr & (RCA|PARERR|FRMERR|BRKDET|OVRRUN)) { c = 0; s = 0; asy->asy_rx_count++; if (lsr & RCA) { c = INB(DAT) & 0xff; /* * Even a single character is received * we need Soft interrupt to pass it to * higher layers. */ needsoft = 1; } /* Check for character break sequence */ if ((abort_enable == KIOCABORTALTERNATE) && (async->async_dev == rconsdev)) { if (abort_charseq_recognize(c)) abort_sequence_enter((char *)NULL); } /* Handle framing errors */ if (lsr & (PARERR|FRMERR|BRKDET|OVRRUN)) { if (lsr & PARERR) { if (tp->t_iflag & INPCK) /* parity enabled */ s |= PERROR; } if (lsr & (FRMERR|BRKDET)) s |= FRERROR; if (lsr & OVRRUN) { async->async_hw_overrun = 1; s |= OVERRUN; } } if (s == 0) if ((tp->t_iflag & PARMRK) && !(tp->t_iflag & (IGNPAR|ISTRIP)) && (c == 0377)) if (RING_POK(async, 2)) { RING_PUT(async, 0377); RING_PUT(async, c); } else async->async_sw_overrun = 1; else if (RING_POK(async, 1)) RING_PUT(async, c); else async->async_sw_overrun = 1; else if (s & FRERROR) { /* Handle framing errors */ if (c == 0) { /* Look for break on kbd, stdin, or rconsdev */ if ((async->async_dev == kbddev) || ((async->async_dev == rconsdev) || (async->async_dev == stdindev)) && (abort_enable != KIOCABORTALTERNATE)) abort_sequence_enter((char *)0); else async->async_break++; } else { if (RING_POK(async, 1)) RING_MARK(async, c, s); else async->async_sw_overrun = 1; } } else { /* Parity errors handled by ldterm */ if (RING_POK(async, 1)) RING_MARK(async, c, s); else async->async_sw_overrun = 1; } lsr = INB(LSR); if (asy->asy_rx_count > 16) break; } /* Check whether there is a request for hw/sw inbound/input flow ctrl */ if ((async->async_ttycommon.t_cflag & CRTSXOFF) || (async->async_ttycommon.t_iflag & IXOFF)) if ((int)(RING_CNT(async)) > (RINGSIZE * 3)/4) { #ifdef DEBUG if (asydebug & ASY_DEBUG_HFLOW) printf("asy%d: hardware flow stop input.\n", UNIT(async->async_dev)); #endif async->async_flags |= ASYNC_HW_IN_FLOW; async->async_flowc = async->async_stopc; async->async_ringbuf_overflow = 1; } if ((async->async_flags & ASYNC_SERVICEIMM) || needsoft || (RING_FRAC(async)) || (async->async_polltid == 0)) ASYSETSOFT(asy); /* need a soft interrupt */ } /* * Interrupt on port: handle PPS event. This function is only called * for a port on which PPS event handling has been enabled. */ static void asy_ppsevent(struct asycom *asy, int msr) { if (asy->asy_flags & ASY_PPS_EDGE) { /* Have seen leading edge, now look for and record drop */ if ((msr & DCD) == 0) asy->asy_flags &= ~ASY_PPS_EDGE; /* * Waiting for leading edge, look for rise; stamp event and * calibrate kernel clock. */ } else if (msr & DCD) { /* * This code captures a timestamp at the designated * transition of the PPS signal (DCD asserted). The * code provides a pointer to the timestamp, as well * as the hardware counter value at the capture. * * Note: the kernel has nano based time values while * NTP requires micro based, an in-line fast algorithm * to convert nsec to usec is used here -- see hrt2ts() * in common/os/timers.c for a full description. */ struct timeval *tvp = &asy_ppsev.tv; timestruc_t ts; long nsec, usec; asy->asy_flags |= ASY_PPS_EDGE; gethrestime(&ts); nsec = ts.tv_nsec; usec = nsec + (nsec >> 2); usec = nsec + (usec >> 1); usec = nsec + (usec >> 2); usec = nsec + (usec >> 4); usec = nsec - (usec >> 3); usec = nsec + (usec >> 2); usec = nsec + (usec >> 3); usec = nsec + (usec >> 4); usec = nsec + (usec >> 1); usec = nsec + (usec >> 6); tvp->tv_usec = usec >> 10; tvp->tv_sec = ts.tv_sec; ++asy_ppsev.serial; /* * Because the kernel keeps a high-resolution time, * pass the current highres timestamp in tvp and zero * in usec. */ ddi_hardpps(tvp, 0); } } /* * Modem status interrupt. * * (Note: It is assumed that the MSR hasn't been read by asyintr().) */ static void async_msint(struct asycom *asy) { struct asyncline *async = (struct asyncline *)asy->asy_priv; int msr; msr = INB(MSR); /* this resets the interrupt */ asy->asy_cached_msr = msr; #ifdef DEBUG if (asydebug & ASY_DEBUG_STATE) { printf(" transition: %3s %3s %3s %3s\n" "current state: %3s %3s %3s %3s\n", (msr & DCTS) ? "CTS" : " ", (msr & DDSR) ? "DSR" : " ", (msr & DRI) ? "RI " : " ", (msr & DDCD) ? "DCD" : " ", (msr & CTS) ? "CTS" : " ", (msr & DSR) ? "DSR" : " ", (msr & RI) ? "RI " : " ", (msr & DCD) ? "DCD" : " "); } #endif if (async->async_ttycommon.t_cflag & CRTSCTS && !(msr & CTS)) { #ifdef DEBUG if (asydebug & ASY_DEBUG_HFLOW) printf("asy%d: hflow start\n", UNIT(async->async_dev)); #endif async->async_flags |= ASYNC_HW_OUT_FLW; } if (asy->asy_hwtype == ASY82510) OUTB(MSR, (msr & 0xF0)); /* Handle PPS event */ if (asy->asy_flags & ASY_PPS) asy_ppsevent(asy, msr); async->async_ext++; ASYSETSOFT(asy); } /* * Handle a second-stage interrupt. */ uint_t asysoftintr(caddr_t intarg) { struct asycom *asy = (struct asycom *)intarg; struct asyncline *async; int rv; int cc; /* * Test and clear soft interrupt. */ mutex_enter(asy->asy_soft_lock); #ifdef DEBUG if (asydebug & ASY_DEBUG_PROCS) printf("softintr\n"); #endif rv = asy->asysoftpend; if (rv != 0) asy->asysoftpend = 0; mutex_exit(asy->asy_soft_lock); if (rv) { if (asy->asy_priv == NULL) return (rv); async = (struct asyncline *)asy->asy_priv; mutex_enter(asy->asy_excl_hi); if (asy->asy_flags & ASY_NEEDSOFT) { asy->asy_flags &= ~ASY_NEEDSOFT; mutex_exit(asy->asy_excl_hi); (void) async_softint(asy); mutex_enter(asy->asy_excl_hi); } /* * There are some instances where the softintr is not * scheduled and hence not called. It so happened that makes * the last few characters to be stuck in ringbuffer. * Hence, call once again the handler so that the last few * characters are cleared. */ cc = RING_CNT(async); mutex_exit(asy->asy_excl_hi); if (cc > 0) { (void) async_softint(asy); } } return (rv); } /* * Handle a software interrupt. */ static int async_softint(struct asycom *asy) { struct asyncline *async = (struct asyncline *)asy->asy_priv; uint_t cc; mblk_t *bp; queue_t *q; uchar_t val; uchar_t c; tty_common_t *tp; #ifdef DEBUG if (asydebug & ASY_DEBUG_PROCS) printf("process\n"); #endif mutex_enter(asy->asy_excl); if (asy->asy_flags & ASY_DOINGSOFT) { mutex_exit(asy->asy_excl); return (0); } tp = &async->async_ttycommon; q = tp->t_readq; if (q != NULL) { mutex_exit(asy->asy_excl); enterq(q); mutex_enter(asy->asy_excl); } mutex_enter(asy->asy_excl_hi); asy->asy_flags |= ASY_DOINGSOFT; if (INB(ICR) & MIEN) val = asy->asy_cached_msr & 0xFF; else val = INB(MSR) & 0xFF; if (async->async_ttycommon.t_cflag & CRTSCTS) { if ((val & CTS) && (async->async_flags & ASYNC_HW_OUT_FLW)) { #ifdef DEBUG if (asydebug & ASY_DEBUG_HFLOW) printf("asy%d: hflow start\n", UNIT(async->async_dev)); #endif async->async_flags &= ~ASYNC_HW_OUT_FLW; mutex_exit(asy->asy_excl_hi); if (async->async_ocnt > 0) { mutex_enter(asy->asy_excl_hi); async_resume(async); mutex_exit(asy->asy_excl_hi); } else { async_start(async); } mutex_enter(asy->asy_excl_hi); } } if (async->async_ext) { async->async_ext = 0; /* check for carrier up */ if ((val & DCD) || (tp->t_flags & TS_SOFTCAR)) { /* carrier present */ if ((async->async_flags & ASYNC_CARR_ON) == 0) { async->async_flags |= ASYNC_CARR_ON; mutex_exit(asy->asy_excl_hi); mutex_exit(asy->asy_excl); if (async->async_flags & ASYNC_ISOPEN) (void) putctl(q, M_UNHANGUP); cv_broadcast(&async->async_flags_cv); mutex_enter(asy->asy_excl); mutex_enter(asy->asy_excl_hi); } } else { if ((async->async_flags & ASYNC_CARR_ON) && !(tp->t_cflag & CLOCAL)) { int flushflag; /* * Carrier went away. * Drop DTR, abort any output in * progress, indicate that output is * not stopped, and send a hangup * notification upstream. * * If we're in the midst of close, then flush * everything. Don't leave stale ioctls lying * about. */ val = INB(MCR); OUTB(MCR, (val & ~DTR)); flushflag = (async->async_flags & ASYNC_CLOSING) ? FLUSHALL : FLUSHDATA; flushq(tp->t_writeq, flushflag); if (async->async_xmitblk != NULL) { freeb(async->async_xmitblk); async->async_xmitblk = NULL; } if (async->async_flags & ASYNC_BUSY) { async->async_ocnt = 0; async->async_flags &= ~ASYNC_BUSY; } async->async_flags &= ~ASYNC_STOPPED; if (async->async_flags & ASYNC_ISOPEN) { mutex_exit(asy->asy_excl_hi); mutex_exit(asy->asy_excl); (void) putctl(q, M_HANGUP); mutex_enter(asy->asy_excl); mutex_enter(asy->asy_excl_hi); } async->async_flags &= ~ASYNC_CARR_ON; mutex_exit(asy->asy_excl_hi); cv_broadcast(&async->async_flags_cv); mutex_enter(asy->asy_excl_hi); } } } /* * If data has been added to the circular buffer, remove * it from the buffer, and send it up the stream if there's * somebody listening. Try to do it 16 bytes at a time. If we * have more than 16 bytes to move, move 16 byte chunks and * leave the rest for next time around (maybe it will grow). */ if (!(async->async_flags & ASYNC_ISOPEN)) { RING_INIT(async); goto rv; } if ((cc = RING_CNT(async)) == 0) { goto rv; } mutex_exit(asy->asy_excl_hi); if (!canput(q)) { if ((async->async_flags & ASYNC_HW_IN_FLOW) == 0) { #ifdef DEBUG if (!(asydebug & ASY_DEBUG_HFLOW)) { printf("asy%d: hflow stop input.\n", UNIT(async->async_dev)); if (canputnext(q)) printf("asy%d: next queue is " "ready\n", UNIT(async->async_dev)); } #endif mutex_enter(asy->asy_excl_hi); async->async_flags |= ASYNC_HW_IN_FLOW; async->async_flowc = async->async_stopc; } else mutex_enter(asy->asy_excl_hi); goto rv; } if (async->async_ringbuf_overflow) { if ((async->async_flags & ASYNC_HW_IN_FLOW) && ((int)(RING_CNT(async)) < (RINGSIZE/4))) { #ifdef DEBUG if (asydebug & ASY_DEBUG_HFLOW) printf("asy%d: hflow start input.\n", UNIT(async->async_dev)); #endif mutex_enter(asy->asy_excl_hi); async->async_flags &= ~ASYNC_HW_IN_FLOW; async->async_flowc = async->async_startc; async->async_ringbuf_overflow = 0; goto rv; } } #ifdef DEBUG if (asydebug & ASY_DEBUG_INPUT) printf("asy%d: %d char(s) in queue.\n", UNIT(async->async_dev), cc); #endif /* * Before you pull the characters from the RING BUF * Check whether you can put into the queue again */ if ((!canputnext(q)) || (!canput(q))) { mutex_enter(asy->asy_excl_hi); if ((async->async_flags & ASYNC_HW_IN_FLOW) == 0) { async->async_flags |= ASYNC_HW_IN_FLOW; async->async_flowc = async->async_stopc; async->async_queue_full = 1; } goto rv; } mutex_enter(asy->asy_excl_hi); if (async->async_queue_full) { /* * Last time the Stream queue didnot allow * now it allows so, relax, the flow control */ if (async->async_flags & ASYNC_HW_IN_FLOW) { async->async_flags &= ~ASYNC_HW_IN_FLOW; async->async_queue_full = 0; async->async_flowc = async->async_startc; goto rv; } else async->async_queue_full = 0; } mutex_exit(asy->asy_excl_hi); if (!(bp = allocb(cc, BPRI_MED))) { ttycommon_qfull(&async->async_ttycommon, q); mutex_enter(asy->asy_excl_hi); goto rv; } mutex_enter(asy->asy_excl_hi); do { if (RING_ERR(async, S_ERRORS)) { RING_UNMARK(async); c = RING_GET(async); break; } else { *bp->b_wptr++ = RING_GET(async); } } while (--cc); mutex_exit(asy->asy_excl_hi); mutex_exit(asy->asy_excl); if (bp->b_wptr > bp->b_rptr) { if (!canputnext(q)) { if (!canput(q)) { /* * Even after taking all precautions that * Still we are unable to queue, then we * cannot do anything, just drop the block */ cmn_err(CE_NOTE, "su%d: local queue full\n", UNIT(async->async_dev)); freemsg(bp); mutex_enter(asy->asy_excl_hi); if ((async->async_flags & ASYNC_HW_IN_FLOW) == 0) { async->async_flags |= ASYNC_HW_IN_FLOW; async->async_flowc = async->async_stopc; async->async_queue_full = 1; } mutex_exit(asy->asy_excl_hi); } else { (void) putq(q, bp); } } else { putnext(q, bp); } } else { freemsg(bp); } /* * If we have a parity error, then send * up an M_BREAK with the "bad" * character as an argument. Let ldterm * figure out what to do with the error. */ if (cc) (void) putctl1(q, M_BREAK, c); mutex_enter(asy->asy_excl); mutex_enter(asy->asy_excl_hi); rv: /* * If a transmission has finished, indicate that it's finished, * and start that line up again. */ if (async->async_break) { async->async_break = 0; if (async->async_flags & ASYNC_ISOPEN) { mutex_exit(asy->asy_excl_hi); mutex_exit(asy->asy_excl); (void) putctl(q, M_BREAK); mutex_enter(asy->asy_excl); mutex_enter(asy->asy_excl_hi); } } if ((async->async_ocnt <= 0 && (async->async_flags & ASYNC_BUSY)) || (async->async_flowc != '\0')) { async->async_flags &= ~ASYNC_BUSY; mutex_exit(asy->asy_excl_hi); if (async->async_xmitblk) freeb(async->async_xmitblk); async->async_xmitblk = NULL; if (async->async_flags & ASYNC_ISOPEN) { asy->inperim = B_TRUE; mutex_exit(asy->asy_excl); enterq(async->async_ttycommon.t_writeq); mutex_enter(asy->asy_excl); } async_start(async); /* * We need to check for inperim and ISOPEN due to * multi-threading implications; it's possible to close the * port and nullify async_flags while completing the software * interrupt. If the port is closed, leaveq() will have already * been called. We don't want to call it twice. */ if ((asy->inperim) && (async->async_flags & ASYNC_ISOPEN)) { mutex_exit(asy->asy_excl); leaveq(async->async_ttycommon.t_writeq); mutex_enter(asy->asy_excl); asy->inperim = B_FALSE; } if (!(async->async_flags & ASYNC_BUSY)) cv_broadcast(&async->async_flags_cv); mutex_enter(asy->asy_excl_hi); } /* * A note about these overrun bits: all they do is *tell* someone * about an error- They do not track multiple errors. In fact, * you could consider them latched register bits if you like. * We are only interested in printing the error message once for * any cluster of overrun errrors. */ if (async->async_hw_overrun) { if (async->async_flags & ASYNC_ISOPEN) { if (su_log > 0) { mutex_exit(asy->asy_excl_hi); mutex_exit(asy->asy_excl); cmn_err(CE_NOTE, "su%d: silo overflow\n", UNIT(async->async_dev)); mutex_enter(asy->asy_excl); mutex_enter(asy->asy_excl_hi); } INC64_KSTAT(asy, siloover); } async->async_hw_overrun = 0; } if (async->async_sw_overrun) { if (async->async_flags & ASYNC_ISOPEN) { if (su_log > 0) { mutex_exit(asy->asy_excl_hi); mutex_exit(asy->asy_excl); cmn_err(CE_NOTE, "su%d: ring buffer overflow\n", UNIT(async->async_dev)); mutex_enter(asy->asy_excl); mutex_enter(asy->asy_excl_hi); } INC64_KSTAT(asy, ringover); } async->async_sw_overrun = 0; } asy->asy_flags &= ~ASY_DOINGSOFT; mutex_exit(asy->asy_excl_hi); mutex_exit(asy->asy_excl); if (q != NULL) leaveq(q); return (0); } /* * Restart output on a line after a delay or break timer expired. */ static void async_restart(void *arg) { struct asyncline *async = arg; struct asycom *asy = async->async_common; queue_t *q; uchar_t lcr; /* * If break timer expired, turn off the break bit. */ #ifdef DEBUG if (asydebug & ASY_DEBUG_PROCS) printf("restart\n"); #endif mutex_enter(asy->asy_excl); if (async->async_flags & ASYNC_BREAK) { unsigned int rate; mutex_enter(asy->asy_excl_hi); lcr = INB(LCR); OUTB(LCR, (lcr & ~SETBREAK)); /* * Go to sleep for the time it takes for at least one * stop bit to be received by the device at the other * end of the line as stated in the RS-232 specification. * The wait period is equal to: * 2 clock cycles * (1 MICROSEC / baud rate) */ rate = async->async_ttycommon.t_cflag & CBAUD; if (async->async_ttycommon.t_cflag & CBAUDEXT) rate += 16; if (rate >= N_SU_SPEEDS || rate == B0) { rate = B9600; } mutex_exit(asy->asy_excl_hi); mutex_exit(asy->asy_excl); drv_usecwait(2 * MICROSEC / baudtable[rate]); mutex_enter(asy->asy_excl); } async->async_flags &= ~(ASYNC_DELAY|ASYNC_BREAK|ASYNC_DRAINING); if ((q = async->async_ttycommon.t_writeq) != NULL) { mutex_exit(asy->asy_excl); enterq(q); mutex_enter(asy->asy_excl); } async_start(async); mutex_exit(asy->asy_excl); if (q != NULL) leaveq(q); /* cleared break or delay flag; may have made some output progress */ cv_broadcast(&async->async_flags_cv); } static void async_start(struct asyncline *async) { async_nstart(async, 0); } /* * Start output on a line, unless it's busy, frozen, or otherwise. */ static void async_nstart(struct asyncline *async, int mode) { register struct asycom *asy = async->async_common; register int cc; register queue_t *q; mblk_t *bp, *nbp; uchar_t *xmit_addr; uchar_t val; int fifo_len = 1; int xmit_progress; #ifdef DEBUG if (asydebug & ASY_DEBUG_PROCS) printf("start\n"); #endif if (asy->asy_use_fifo == FIFO_ON) fifo_len = asy->asy_fifo_buf; /* with FIFO buffers */ ASSERT(mutex_owned(asy->asy_excl)); mutex_enter(asy->asy_excl_hi); asycheckflowcontrol_hw(asy); /* * If the chip is busy (i.e., we're waiting for a break timeout * to expire, or for the current transmission to finish, or for * output to finish draining from chip), don't grab anything new. */ if (async->async_flags & (ASYNC_BREAK|ASYNC_BUSY|ASYNC_DRAINING)) { mutex_exit(asy->asy_excl_hi); #ifdef DEBUG if (mode && asydebug & ASY_DEBUG_CLOSE) printf("asy%d: start %s.\n", UNIT(async->async_dev), async->async_flags & ASYNC_BREAK ? "break" : "busy"); #endif return; } /* * If we have a flow-control character to transmit, do it now. */ if (asycheckflowcontrol_sw(asy)) { mutex_exit(asy->asy_excl_hi); return; } mutex_exit(asy->asy_excl_hi); /* * If we're waiting for a delay timeout to expire, don't grab * anything new. */ if (async->async_flags & ASYNC_DELAY) { #ifdef DEBUG if (mode && asydebug & ASY_DEBUG_CLOSE) printf("asy%d: start ASYNC_DELAY.\n", UNIT(async->async_dev)); #endif return; } if ((q = async->async_ttycommon.t_writeq) == NULL) { #ifdef DEBUG if (mode && asydebug & ASY_DEBUG_CLOSE) printf("asy%d: start writeq is null.\n", UNIT(async->async_dev)); #endif return; /* not attached to a stream */ } for (;;) { if ((bp = getq(q)) == NULL) return; /* no data to transmit */ /* * We have a message block to work on. * Check whether it's a break, a delay, or an ioctl (the latter * occurs if the ioctl in question was waiting for the output * to drain). If it's one of those, process it immediately. */ switch (bp->b_datap->db_type) { case M_BREAK: /* * Set the break bit, and arrange for "async_restart" * to be called in 1/4 second; it will turn the * break bit off, and call "async_start" to grab * the next message. */ mutex_enter(asy->asy_excl_hi); val = INB(LCR); OUTB(LCR, (val | SETBREAK)); mutex_exit(asy->asy_excl_hi); async->async_flags |= ASYNC_BREAK; (void) timeout(async_restart, async, hz / 4); freemsg(bp); return; /* wait for this to finish */ case M_DELAY: /* * Arrange for "async_restart" to be called when the * delay expires; it will turn ASYNC_DELAY off, * and call "async_start" to grab the next message. */ (void) timeout(async_restart, async, (clock_t)(*(unsigned char *)bp->b_rptr + 6)); async->async_flags |= ASYNC_DELAY; freemsg(bp); return; /* wait for this to finish */ case M_IOCTL: /* * This ioctl needs to wait for the output ahead of * it to drain. Try to do it, and then either * redo the ioctl at a later time or grab the next * message after it. */ mutex_enter(asy->asy_excl_hi); if (asy_isbusy(asy)) { /* * Get the divisor by calculating the rate */ unsigned int rate; mutex_exit(asy->asy_excl_hi); rate = async->async_ttycommon.t_cflag & CBAUD; if (async->async_ttycommon.t_cflag & CBAUDEXT) rate += 16; if (rate >= N_SU_SPEEDS || rate == B0) { rate = B9600; } /* * We need to do a callback as the port will * be set to drain */ async->async_flags |= ASYNC_DRAINING; /* * Put the message we just processed back onto * the end of the queue */ if (putq(q, bp) == 0) freemsg(bp); /* * We need to delay until the TSR and THR * have been exhausted. We base the delay on * the amount of time it takes to transmit * 2 chars at the current baud rate in * microseconds. * * Therefore, the wait period is: * * (#TSR bits + #THR bits) * * 1 MICROSEC / baud rate */ (void) timeout(async_restart, async, drv_usectohz(16 * MICROSEC / baudtable[rate])); return; } mutex_exit(asy->asy_excl_hi); mutex_exit(asy->asy_excl); async_ioctl(async, q, bp, B_FALSE); mutex_enter(asy->asy_excl); continue; } while (bp != NULL && (cc = bp->b_wptr - bp->b_rptr) == 0) { nbp = bp->b_cont; freeb(bp); bp = nbp; } if (bp != NULL) break; } /* * We have data to transmit. If output is stopped, put * it back and try again later. */ if (async->async_flags & (ASYNC_HW_OUT_FLW|ASYNC_STOPPED)) { #ifdef DEBUG if (asydebug & ASY_DEBUG_HFLOW && async->async_flags & ASYNC_HW_OUT_FLW) printf("asy%d: output hflow in effect.\n", UNIT(async->async_dev)); #endif mutex_exit(asy->asy_excl); (void) putbq(q, bp); /* * We entered the routine owning the lock, we need to * exit the routine owning the lock. */ mutex_enter(asy->asy_excl); return; } async->async_xmitblk = bp; xmit_addr = bp->b_rptr; bp = bp->b_cont; if (bp != NULL) { mutex_exit(asy->asy_excl); (void) putbq(q, bp); /* not done with this message yet */ mutex_enter(asy->asy_excl); } /* * In 5-bit mode, the high order bits are used * to indicate character sizes less than five, * so we need to explicitly mask before transmitting */ if ((async->async_ttycommon.t_cflag & CSIZE) == CS5) { register unsigned char *p = xmit_addr; register int cnt = cc; while (cnt--) *p++ &= (unsigned char) 0x1f; } /* * Set up this block for pseudo-DMA. */ mutex_enter(asy->asy_excl_hi); async->async_optr = xmit_addr; async->async_ocnt = cc; /* * If the transmitter is ready, shove some * characters out. */ xmit_progress = 0; while (fifo_len-- && async->async_ocnt) { if (INB(LSR) & XHRE) { OUTB(DAT, *async->async_optr++); async->async_ocnt--; xmit_progress++; } } asy->asy_out_of_band_xmit = xmit_progress; if (xmit_progress > 0) async->async_flags |= ASYNC_PROGRESS; async->async_flags |= ASYNC_BUSY; mutex_exit(asy->asy_excl_hi); } /* * Resume output by poking the transmitter. */ static void async_resume(struct asyncline *async) { register struct asycom *asy = async->async_common; ASSERT(mutex_owned(asy->asy_excl_hi)); #ifdef DEBUG if (asydebug & ASY_DEBUG_PROCS) printf("resume\n"); #endif asycheckflowcontrol_hw(asy); if (INB(LSR) & XHRE) { if (asycheckflowcontrol_sw(asy)) { return; } else if (async->async_ocnt > 0) { OUTB(DAT, *async->async_optr++); async->async_ocnt--; async->async_flags |= ASYNC_PROGRESS; } } } /* * Process an "ioctl" message sent down to us. * Note that we don't need to get any locks until we are ready to access * the hardware. Nothing we access until then is going to be altered * outside of the STREAMS framework, so we should be safe. */ static void async_ioctl(struct asyncline *async, queue_t *wq, mblk_t *mp, boolean_t iswput) { register struct asycom *asy = async->async_common; register tty_common_t *tp = &async->async_ttycommon; register struct iocblk *iocp; register unsigned datasize; mblk_t *datamp; int error = 0; uchar_t val, icr; #ifdef DEBUG if (asydebug & ASY_DEBUG_PROCS) printf("ioctl\n"); #endif if (tp->t_iocpending != NULL) { /* * We were holding an "ioctl" response pending the * availability of an "mblk" to hold data to be passed up; * another "ioctl" came through, which means that "ioctl" * must have timed out or been aborted. */ freemsg(async->async_ttycommon.t_iocpending); async->async_ttycommon.t_iocpending = NULL; } iocp = (struct iocblk *)mp->b_rptr; /* * For TIOCMGET, TIOCMBIC, TIOCMBIS, TIOCMSET, and PPS, do NOT call * ttycommon_ioctl() because this function frees up the message block * (mp->b_cont) that contains the address of the user variable where * we need to pass back the bit array. */ if (iocp->ioc_cmd == TIOCMGET || iocp->ioc_cmd == TIOCMBIC || iocp->ioc_cmd == TIOCMBIS || iocp->ioc_cmd == TIOCMSET || iocp->ioc_cmd == TIOCGPPS || iocp->ioc_cmd == TIOCSPPS || iocp->ioc_cmd == TIOCGPPSEV) error = -1; /* Do Nothing */ else /* * The only way in which "ttycommon_ioctl" can fail is if the "ioctl" * requires a response containing data to be returned to the user, * and no mblk could be allocated for the data. * No such "ioctl" alters our state. Thus, we always go ahead and * do any state-changes the "ioctl" calls for. If we couldn't allocate * the data, "ttycommon_ioctl" has stashed the "ioctl" away safely, so * we just call "bufcall" to request that we be called back when we * stand a better chance of allocating the data. */ if ((datasize = ttycommon_ioctl(tp, wq, mp, &error)) != 0) { if (async->async_wbufcid) unbufcall(async->async_wbufcid); async->async_wbufcid = bufcall(datasize, BPRI_HI, async_reioctl, async); return; } mutex_enter(asy->asy_excl); if (error == 0) { /* * "ttycommon_ioctl" did most of the work; we just use the * data it set up. */ switch (iocp->ioc_cmd) { case TCSETS: if (!(asy->asy_rsc_console || asy->asy_rsc_control || asy->asy_lom_console)) { mutex_enter(asy->asy_excl_hi); error = asy_program(asy, ASY_NOINIT); mutex_exit(asy->asy_excl_hi); } break; case TCSETSF: case TCSETSW: case TCSETA: case TCSETAW: case TCSETAF: if (!(asy->asy_rsc_console || asy->asy_rsc_control || asy->asy_lom_console)) { mutex_enter(asy->asy_excl_hi); if (iswput && asy_isbusy(asy)) { if (putq(wq, mp) == 0) freemsg(mp); mutex_exit(asy->asy_excl_hi); mutex_exit(asy->asy_excl); return; } error = asy_program(asy, ASY_NOINIT); mutex_exit(asy->asy_excl_hi); } break; case TIOCSSOFTCAR: /* Set the driver state appropriately */ mutex_enter(asy->asy_excl_hi); if (tp->t_flags & TS_SOFTCAR) asy->asy_flags |= ASY_IGNORE_CD; else asy->asy_flags &= ~ASY_IGNORE_CD; mutex_exit(asy->asy_excl_hi); break; } } else if (error < 0) { /* * "ttycommon_ioctl" didn't do anything; we process it here. */ error = 0; switch (iocp->ioc_cmd) { case TIOCGPPS: /* * Get PPS on/off. */ if (mp->b_cont != NULL) freemsg(mp->b_cont); mp->b_cont = allocb(sizeof (int), BPRI_HI); if (mp->b_cont == NULL) { error = ENOMEM; break; } if (asy->asy_flags & ASY_PPS) *(int *)mp->b_cont->b_wptr = 1; else *(int *)mp->b_cont->b_wptr = 0; mp->b_cont->b_wptr += sizeof (int); mp->b_datap->db_type = M_IOCACK; iocp->ioc_count = sizeof (int); break; case TIOCSPPS: /* * Set PPS on/off. */ error = miocpullup(mp, sizeof (int)); if (error != 0) break; mutex_enter(asy->asy_excl_hi); if (*(int *)mp->b_cont->b_rptr) asy->asy_flags |= ASY_PPS; else asy->asy_flags &= ~ASY_PPS; /* Reset edge sense */ asy->asy_flags &= ~ASY_PPS_EDGE; mutex_exit(asy->asy_excl_hi); mp->b_datap->db_type = M_IOCACK; break; case TIOCGPPSEV: { /* * Get PPS event data. */ mblk_t *bp; void *buf; #ifdef _SYSCALL32_IMPL struct ppsclockev32 p32; #endif struct ppsclockev ppsclockev; if (mp->b_cont != NULL) { freemsg(mp->b_cont); mp->b_cont = NULL; } if ((asy->asy_flags & ASY_PPS) == 0) { error = ENXIO; break; } /* Protect from incomplete asy_ppsev */ mutex_enter(asy->asy_excl_hi); ppsclockev = asy_ppsev; mutex_exit(asy->asy_excl_hi); #ifdef _SYSCALL32_IMPL if ((iocp->ioc_flag & IOC_MODELS) != IOC_NATIVE) { TIMEVAL_TO_TIMEVAL32(&p32.tv, &ppsclockev.tv); p32.serial = ppsclockev.serial; buf = &p32; iocp->ioc_count = sizeof (struct ppsclockev32); } else #endif { buf = &ppsclockev; iocp->ioc_count = sizeof (struct ppsclockev); } if ((bp = allocb(iocp->ioc_count, BPRI_HI)) == NULL) { error = ENOMEM; break; } mp->b_cont = bp; bcopy(buf, bp->b_wptr, iocp->ioc_count); bp->b_wptr += iocp->ioc_count; mp->b_datap->db_type = M_IOCACK; break; } case TCSBRK: error = miocpullup(mp, sizeof (int)); if (error != 0) break; mutex_enter(asy->asy_excl_hi); if (*(int *)mp->b_cont->b_rptr == 0) { /* * Get the divisor by calculating the rate */ unsigned int rate, divisor; rate = async->async_ttycommon.t_cflag & CBAUD; if (async->async_ttycommon.t_cflag & CBAUDEXT) rate += 16; if (rate >= N_SU_SPEEDS) rate = B9600; divisor = asyspdtab[rate] & 0xfff; /* * To ensure that erroneous characters are * not sent out when the break is set, SB * recommends three steps: * * 1) pad the TSR with 0 bits * 2) When the TSR is full, set break * 3) When the TSR has been flushed, unset * the break when transmission must be * restored. * * We loop until the TSR is empty and then * set the break. ASYNC_BREAK has been set * to ensure that no characters are * transmitted while the TSR is being * flushed and SOUT is being used for the * break signal. * * The wait period is equal to * clock / (baud * 16) * 16 * 2. */ async->async_flags |= ASYNC_BREAK; while ((INB(LSR) & XSRE) == 0) { mutex_exit(asy->asy_excl_hi); mutex_exit(asy->asy_excl); drv_usecwait(32*divisor); mutex_enter(asy->asy_excl); mutex_enter(asy->asy_excl_hi); } /* * Set the break bit, and arrange for * "async_restart" to be called in 1/4 second; * it will turn the break bit off, and call * "async_start" to grab the next message. */ val = INB(LCR); OUTB(LCR, (val | SETBREAK)); mutex_exit(asy->asy_excl_hi); (void) timeout(async_restart, async, hz / 4); } else { #ifdef DEBUG if (asydebug & ASY_DEBUG_CLOSE) printf("asy%d: wait for flush.\n", UNIT(async->async_dev)); #endif if (iswput && asy_isbusy(asy)) { if (putq(wq, mp) == 0) freemsg(mp); mutex_exit(asy->asy_excl_hi); mutex_exit(asy->asy_excl); return; } mutex_exit(asy->asy_excl_hi); #ifdef DEBUG if (asydebug & ASY_DEBUG_CLOSE) printf("asy%d: ldterm satisfied.\n", UNIT(async->async_dev)); #endif } break; case TIOCSBRK: mutex_enter(asy->asy_excl_hi); val = INB(LCR); OUTB(LCR, (val | SETBREAK)); mutex_exit(asy->asy_excl_hi); mutex_exit(asy->asy_excl); miocack(wq, mp, 0, 0); return; case TIOCCBRK: mutex_enter(asy->asy_excl_hi); val = INB(LCR); OUTB(LCR, (val & ~SETBREAK)); mutex_exit(asy->asy_excl_hi); mutex_exit(asy->asy_excl); miocack(wq, mp, 0, 0); return; case TIOCMSET: case TIOCMBIS: case TIOCMBIC: if (iocp->ioc_count == TRANSPARENT) mcopyin(mp, NULL, sizeof (int), NULL); else { error = miocpullup(mp, sizeof (int)); if (error != 0) break; mutex_enter(asy->asy_excl_hi); (void) asymctl(asy, dmtoasy(*(int *)mp->b_cont->b_rptr), iocp->ioc_cmd); mutex_exit(asy->asy_excl_hi); iocp->ioc_error = 0; mp->b_datap->db_type = M_IOCACK; } break; case TIOCSILOOP: mutex_enter(asy->asy_excl_hi); /* * If somebody misues this Ioctl when used for * driving keyboard and mouse indicate not supported */ if ((asy->asy_device_type == ASY_KEYBOARD) || (asy->asy_device_type == ASY_MOUSE)) { mutex_exit(asy->asy_excl_hi); error = ENOTTY; break; } /* should not use when we're the console */ if ((async->async_dev == kbddev) || (async->async_dev == rconsdev) || (async->async_dev == stdindev)) { mutex_exit(asy->asy_excl_hi); error = EINVAL; break; } val = INB(MCR); icr = INB(ICR); /* * Disable the Modem Status Interrupt * The reason for disabling is the status of * modem signal are in the higher 4 bits instead of * lower four bits when in loopback mode, * so, donot worry about Modem interrupt when * you are planning to set * this in loopback mode until it is cleared by * another ioctl to get out of the loopback mode */ OUTB(ICR, icr & ~ MIEN); OUTB(MCR, val | ASY_LOOP); mutex_exit(asy->asy_excl_hi); iocp->ioc_error = 0; mp->b_datap->db_type = M_IOCACK; break; case TIOCMGET: datamp = allocb(sizeof (int), BPRI_MED); if (datamp == NULL) { error = EAGAIN; break; } mutex_enter(asy->asy_excl_hi); *(int *)datamp->b_rptr = asymctl(asy, 0, TIOCMGET); mutex_exit(asy->asy_excl_hi); if (iocp->ioc_count == TRANSPARENT) { mcopyout(mp, NULL, sizeof (int), NULL, datamp); } else { if (mp->b_cont != NULL) freemsg(mp->b_cont); mp->b_cont = datamp; mp->b_cont->b_wptr += sizeof (int); mp->b_datap->db_type = M_IOCACK; iocp->ioc_count = sizeof (int); } break; default: /* unexpected ioctl type */ /* * If we don't understand it, it's an error. NAK it. */ error = EINVAL; break; } } if (error != 0) { iocp->ioc_error = error; mp->b_datap->db_type = M_IOCNAK; } mutex_exit(asy->asy_excl); qreply(wq, mp); } static void asyrsrv(queue_t *q) { mblk_t *bp; struct asyncline *async; async = (struct asyncline *)q->q_ptr; while (canputnext(q) && (bp = getq(q))) putnext(q, bp); ASYSETSOFT(async->async_common); async->async_polltid = 0; } /* * Put procedure for write queue. * Respond to M_STOP, M_START, M_IOCTL, and M_FLUSH messages here; * set the flow control character for M_STOPI and M_STARTI messages; * queue up M_BREAK, M_DELAY, and M_DATA messages for processing * by the start routine, and then call the start routine; discard * everything else. Note that this driver does not incorporate any * mechanism to negotiate to handle the canonicalization process. * It expects that these functions are handled in upper module(s), * as we do in ldterm. */ static void asywput(queue_t *q, mblk_t *mp) { register struct asyncline *async; register struct asycom *asy; int error; async = (struct asyncline *)q->q_ptr; asy = async->async_common; switch (mp->b_datap->db_type) { case M_STOP: /* * Since we don't do real DMA, we can just let the * chip coast to a stop after applying the brakes. */ mutex_enter(asy->asy_excl); async->async_flags |= ASYNC_STOPPED; mutex_exit(asy->asy_excl); freemsg(mp); break; case M_START: mutex_enter(asy->asy_excl); if (async->async_flags & ASYNC_STOPPED) { async->async_flags &= ~ASYNC_STOPPED; /* * If an output operation is in progress, * resume it. Otherwise, prod the start * routine. */ if (async->async_ocnt > 0) { mutex_enter(asy->asy_excl_hi); async_resume(async); mutex_exit(asy->asy_excl_hi); } else { async_start(async); } } mutex_exit(asy->asy_excl); freemsg(mp); break; case M_IOCTL: switch (((struct iocblk *)mp->b_rptr)->ioc_cmd) { case TCSBRK: error = miocpullup(mp, sizeof (int)); if (error != 0) { miocnak(q, mp, 0, error); return; } if (*(int *)mp->b_cont->b_rptr != 0) { #ifdef DEBUG if (asydebug & ASY_DEBUG_CLOSE) printf("asy%d: flush request.\n", UNIT(async->async_dev)); #endif (void) putq(q, mp); mutex_enter(asy->asy_excl); async_nstart(async, 1); mutex_exit(asy->asy_excl); break; } /*FALLTHROUGH*/ case TCSETSW: case TCSETSF: case TCSETAW: case TCSETAF: /* * The changes do not take effect until all * output queued before them is drained. * Put this message on the queue, so that * "async_start" will see it when it's done * with the output before it. Poke the * start routine, just in case. */ (void) putq(q, mp); mutex_enter(asy->asy_excl); async_start(async); mutex_exit(asy->asy_excl); break; default: /* * Do it now. */ async_ioctl(async, q, mp, B_TRUE); break; } break; case M_FLUSH: if (*mp->b_rptr & FLUSHW) { mutex_enter(asy->asy_excl); /* * Abort any output in progress. */ mutex_enter(asy->asy_excl_hi); if (async->async_flags & ASYNC_BUSY) { async->async_ocnt = 0; async->async_flags &= ~ASYNC_BUSY; } mutex_exit(asy->asy_excl_hi); /* Flush FIFO buffers */ if (asy->asy_use_fifo == FIFO_ON) { OUTB(FIFOR, FIFO_ON | FIFODMA | FIFOTXFLSH | (asy->asy_trig_level & 0xff)); } /* * Flush our write queue. */ flushq(q, FLUSHDATA); /* XXX doesn't flush M_DELAY */ if (async->async_xmitblk != NULL) { freeb(async->async_xmitblk); async->async_xmitblk = NULL; } mutex_exit(asy->asy_excl); *mp->b_rptr &= ~FLUSHW; /* it has been flushed */ } if (*mp->b_rptr & FLUSHR) { /* Flush FIFO buffers */ if (asy->asy_use_fifo == FIFO_ON) { OUTB(FIFOR, FIFO_ON | FIFODMA | FIFORXFLSH | (asy->asy_trig_level & 0xff)); } flushq(RD(q), FLUSHDATA); qreply(q, mp); /* give the read queues a crack at it */ } else { freemsg(mp); } /* * We must make sure we process messages that survive the * write-side flush. Without this call, the close protocol * with ldterm can hang forever. (ldterm will have sent us a * TCSBRK ioctl that it expects a response to.) */ mutex_enter(asy->asy_excl); async_start(async); mutex_exit(asy->asy_excl); break; case M_BREAK: case M_DELAY: case M_DATA: /* * Queue the message up to be transmitted, * and poke the start routine. */ (void) putq(q, mp); mutex_enter(asy->asy_excl); async_start(async); mutex_exit(asy->asy_excl); break; case M_STOPI: mutex_enter(asy->asy_excl); async->async_flowc = async->async_stopc; async_start(async); /* poke the start routine */ mutex_exit(asy->asy_excl); freemsg(mp); break; case M_STARTI: mutex_enter(asy->asy_excl); async->async_flowc = async->async_startc; async_start(async); /* poke the start routine */ mutex_exit(asy->asy_excl); freemsg(mp); break; case M_CTL: if (MBLKL(mp) >= sizeof (struct iocblk) && ((struct iocblk *)mp->b_rptr)->ioc_cmd == MC_POSIXQUERY) { ((struct iocblk *)mp->b_rptr)->ioc_cmd = MC_HAS_POSIX; qreply(q, mp); } else { /* * These MC_SERVICE type messages are used by upper * modules to tell this driver to send input up * immediately, or that it can wait for normal * processing that may or may not be done. Sun * requires these for the mouse module. * (XXX - for x86?) */ mutex_enter(asy->asy_excl); switch (*mp->b_rptr) { case MC_SERVICEIMM: async->async_flags |= ASYNC_SERVICEIMM; break; case MC_SERVICEDEF: async->async_flags &= ~ASYNC_SERVICEIMM; break; } mutex_exit(asy->asy_excl); freemsg(mp); } break; case M_IOCDATA: async_iocdata(q, mp); break; default: freemsg(mp); break; } } /* * Retry an "ioctl", now that "bufcall" claims we may be able to allocate * the buffer we need. */ static void async_reioctl(void *arg) { struct asyncline *async = arg; struct asycom *asy = async->async_common; queue_t *q; mblk_t *mp; /* * The bufcall is no longer pending. */ mutex_enter(asy->asy_excl); async->async_wbufcid = 0; if ((q = async->async_ttycommon.t_writeq) == NULL) { mutex_exit(asy->asy_excl); return; } if ((mp = async->async_ttycommon.t_iocpending) != NULL) { /* not pending any more */ async->async_ttycommon.t_iocpending = NULL; mutex_exit(asy->asy_excl); /* not in STREAMS queue; we no longer know if we're in wput */ async_ioctl(async, q, mp, B_TRUE); } else mutex_exit(asy->asy_excl); } static void async_iocdata(queue_t *q, mblk_t *mp) { struct asyncline *async = (struct asyncline *)q->q_ptr; struct asycom *asy; struct copyresp *csp; asy = async->async_common; csp = (struct copyresp *)mp->b_rptr; if (csp->cp_rval != 0) { freemsg(mp); return; } mutex_enter(asy->asy_excl); switch (csp->cp_cmd) { case TIOCMSET: case TIOCMBIS: case TIOCMBIC: if (mp->b_cont == NULL) { mutex_exit(asy->asy_excl); miocnak(q, mp, 0, EINVAL); break; } mutex_enter(asy->asy_excl_hi); (void) asymctl(asy, dmtoasy(*(int *)mp->b_cont->b_rptr), csp->cp_cmd); mutex_exit(asy->asy_excl_hi); freemsg(mp->b_cont); mp->b_cont = NULL; mutex_exit(asy->asy_excl); miocack(q, mp, 0, 0); break; case TIOCMGET: if (mp->b_cont != NULL) { freemsg(mp->b_cont); mp->b_cont = NULL; } mutex_exit(asy->asy_excl); miocack(q, mp, 0, 0); break; default: mutex_exit(asy->asy_excl); miocnak(q, mp, 0, EINVAL); break; } } /* * Set or get the modem control status. */ static int asymctl(struct asycom *asy, int bits, int how) { register int mcr_r, msr_r; ASSERT(mutex_owned(asy->asy_excl_hi)); ASSERT(mutex_owned(asy->asy_excl)); /* Read Modem Control Registers */ mcr_r = INB(MCR); switch (how) { case TIOCMSET: mcr_r = bits; break; case TIOCMBIS: mcr_r |= bits; /* Set bits from input */ break; case TIOCMBIC: mcr_r &= ~bits; /* Set ~bits from input */ break; case TIOCMGET: /* Read Modem Status Registers */ if (INB(ICR) & MIEN) msr_r = asy->asy_cached_msr; else msr_r = INB(MSR); return (asytodm(mcr_r, msr_r)); } OUTB(MCR, mcr_r); return (mcr_r); } static int asytodm(int mcr_r, int msr_r) { register int b = 0; /* MCR registers */ if (mcr_r & RTS) b |= TIOCM_RTS; if (mcr_r & DTR) b |= TIOCM_DTR; /* MSR registers */ if (msr_r & DCD) b |= TIOCM_CAR; if (msr_r & CTS) b |= TIOCM_CTS; if (msr_r & DSR) b |= TIOCM_DSR; if (msr_r & RI) b |= TIOCM_RNG; return (b); } static int dmtoasy(int bits) { register int b = 0; #ifdef CAN_NOT_SET /* only DTR and RTS can be set */ if (bits & TIOCM_CAR) b |= DCD; if (bits & TIOCM_CTS) b |= CTS; if (bits & TIOCM_DSR) b |= DSR; if (bits & TIOCM_RNG) b |= RI; #endif if (bits & TIOCM_RTS) b |= RTS; if (bits & TIOCM_DTR) b |= DTR; return (b); } static void asycheckflowcontrol_hw(struct asycom *asy) { struct asyncline *async; uchar_t mcr, flag; ASSERT(mutex_owned(asy->asy_excl_hi)); async = (struct asyncline *)asy->asy_priv; ASSERT(async != NULL); if (async->async_ttycommon.t_cflag & CRTSXOFF) { mcr = INB(MCR); flag = (async->async_flags & ASYNC_HW_IN_FLOW) ? 0 : RTS; if (((mcr ^ flag) & RTS) != 0) { OUTB(MCR, (mcr ^ RTS)); } } } static boolean_t asycheckflowcontrol_sw(struct asycom *asy) { uchar_t ss; struct asyncline *async; int rval = B_FALSE; ASSERT(mutex_owned(asy->asy_excl_hi)); async = (struct asyncline *)asy->asy_priv; ASSERT(async != NULL); if ((ss = async->async_flowc) != '\0' && (INB(LSR) & XHRE)) { /* * If we get this far, then we know that flowc is non-zero and * that there's transmit room available. We've "handled" the * request now, so clear it. If the user didn't ask for IXOFF, * then don't actually send anything, but wait for the next * opportunity. */ async->async_flowc = '\0'; if (async->async_ttycommon.t_iflag & IXOFF) { async->async_flags |= ASYNC_BUSY; OUTB(DAT, ss); rval = B_TRUE; } } return (rval); } /* * Check for abort character sequence */ static boolean_t abort_charseq_recognize(uchar_t ch) { static int state = 0; #define CNTRL(c) ((c)&037) static char sequence[] = { '\r', '~', CNTRL('b') }; if (ch == sequence[state]) { if (++state >= sizeof (sequence)) { state = 0; return (B_TRUE); } } else { state = (ch == sequence[0]) ? 1 : 0; } return (B_FALSE); }