831 lines
21 KiB
C
831 lines
21 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2003 Marcel Moolenaar
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/conf.h>
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#include <sys/cons.h>
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#include <sys/fcntl.h>
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#include <sys/interrupt.h>
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#include <sys/kdb.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/queue.h>
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#include <sys/reboot.h>
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#include <sys/sysctl.h>
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#include <machine/bus.h>
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#include <sys/rman.h>
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#include <machine/resource.h>
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#include <machine/stdarg.h>
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#include <dev/uart/uart.h>
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#include <dev/uart/uart_bus.h>
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#include <dev/uart/uart_cpu.h>
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#include <dev/uart/uart_ppstypes.h>
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#include "uart_if.h"
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const char uart_driver_name[] = "uart";
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SLIST_HEAD(uart_devinfo_list, uart_devinfo) uart_sysdevs =
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SLIST_HEAD_INITIALIZER(uart_sysdevs);
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static MALLOC_DEFINE(M_UART, "UART", "UART driver");
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#ifndef UART_POLL_FREQ
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#define UART_POLL_FREQ 50
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#endif
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static int uart_poll_freq = UART_POLL_FREQ;
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SYSCTL_INT(_debug, OID_AUTO, uart_poll_freq, CTLFLAG_RDTUN, &uart_poll_freq,
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0, "UART poll frequency");
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static int uart_force_poll;
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SYSCTL_INT(_debug, OID_AUTO, uart_force_poll, CTLFLAG_RDTUN, &uart_force_poll,
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0, "Force UART polling");
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static inline int
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uart_pps_mode_valid(int pps_mode)
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{
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int opt;
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switch(pps_mode & UART_PPS_SIGNAL_MASK) {
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case UART_PPS_DISABLED:
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case UART_PPS_CTS:
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case UART_PPS_DCD:
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break;
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default:
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return (false);
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}
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opt = pps_mode & UART_PPS_OPTION_MASK;
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if ((opt & ~(UART_PPS_INVERT_PULSE | UART_PPS_NARROW_PULSE)) != 0)
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return (false);
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return (true);
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}
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static void
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uart_pps_print_mode(struct uart_softc *sc)
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{
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device_printf(sc->sc_dev, "PPS capture mode: ");
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switch(sc->sc_pps_mode & UART_PPS_SIGNAL_MASK) {
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case UART_PPS_DISABLED:
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printf("disabled");
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break;
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case UART_PPS_CTS:
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printf("CTS");
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break;
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case UART_PPS_DCD:
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printf("DCD");
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break;
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default:
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printf("invalid");
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break;
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}
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if (sc->sc_pps_mode & UART_PPS_INVERT_PULSE)
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printf("-Inverted");
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if (sc->sc_pps_mode & UART_PPS_NARROW_PULSE)
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printf("-NarrowPulse");
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printf("\n");
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}
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static int
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uart_pps_mode_sysctl(SYSCTL_HANDLER_ARGS)
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{
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struct uart_softc *sc;
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int err, tmp;
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sc = arg1;
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tmp = sc->sc_pps_mode;
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err = sysctl_handle_int(oidp, &tmp, 0, req);
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if (err != 0 || req->newptr == NULL)
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return (err);
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if (!uart_pps_mode_valid(tmp))
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return (EINVAL);
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sc->sc_pps_mode = tmp;
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return(0);
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}
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static void
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uart_pps_process(struct uart_softc *sc, int ser_sig)
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{
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sbintime_t now;
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int is_assert, pps_sig;
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/* Which signal is configured as PPS? Early out if none. */
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switch(sc->sc_pps_mode & UART_PPS_SIGNAL_MASK) {
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case UART_PPS_CTS:
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pps_sig = SER_CTS;
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break;
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case UART_PPS_DCD:
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pps_sig = SER_DCD;
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break;
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default:
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return;
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}
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/* Early out if there is no change in the signal configured as PPS. */
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if ((ser_sig & SER_DELTA(pps_sig)) == 0)
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return;
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/*
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* In narrow-pulse mode we need to synthesize both capture and clear
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* events from a single "delta occurred" indication from the uart
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* hardware because the pulse width is too narrow to reliably detect
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* both edges. However, when the pulse width is close to our interrupt
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* processing latency we might intermittantly catch both edges. To
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* guard against generating spurious events when that happens, we use a
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* separate timer to ensure at least half a second elapses before we
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* generate another event.
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*/
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pps_capture(&sc->sc_pps);
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if (sc->sc_pps_mode & UART_PPS_NARROW_PULSE) {
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now = getsbinuptime();
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if (now > sc->sc_pps_captime + 500 * SBT_1MS) {
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sc->sc_pps_captime = now;
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pps_event(&sc->sc_pps, PPS_CAPTUREASSERT);
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pps_event(&sc->sc_pps, PPS_CAPTURECLEAR);
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}
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} else {
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is_assert = ser_sig & pps_sig;
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if (sc->sc_pps_mode & UART_PPS_INVERT_PULSE)
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is_assert = !is_assert;
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pps_event(&sc->sc_pps, is_assert ? PPS_CAPTUREASSERT :
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PPS_CAPTURECLEAR);
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}
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}
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static void
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uart_pps_init(struct uart_softc *sc)
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{
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struct sysctl_ctx_list *ctx;
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struct sysctl_oid *tree;
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ctx = device_get_sysctl_ctx(sc->sc_dev);
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tree = device_get_sysctl_tree(sc->sc_dev);
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/*
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* The historical default for pps capture mode is either DCD or CTS,
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* depending on the UART_PPS_ON_CTS kernel option. Start with that,
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* then try to fetch the tunable that overrides the mode for all uart
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* devices, then try to fetch the sysctl-tunable that overrides the mode
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* for one specific device.
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*/
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#ifdef UART_PPS_ON_CTS
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sc->sc_pps_mode = UART_PPS_CTS;
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#else
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sc->sc_pps_mode = UART_PPS_DCD;
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#endif
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TUNABLE_INT_FETCH("hw.uart.pps_mode", &sc->sc_pps_mode);
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SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(tree), OID_AUTO, "pps_mode",
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CTLTYPE_INT | CTLFLAG_RWTUN | CTLFLAG_MPSAFE, sc, 0,
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uart_pps_mode_sysctl, "I", "pulse mode: 0/1/2=disabled/CTS/DCD; "
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"add 0x10 to invert, 0x20 for narrow pulse");
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if (!uart_pps_mode_valid(sc->sc_pps_mode)) {
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device_printf(sc->sc_dev,
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"Invalid pps_mode 0x%02x configured; disabling PPS capture\n",
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sc->sc_pps_mode);
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sc->sc_pps_mode = UART_PPS_DISABLED;
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} else if (bootverbose) {
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uart_pps_print_mode(sc);
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}
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sc->sc_pps.ppscap = PPS_CAPTUREBOTH;
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sc->sc_pps.driver_mtx = uart_tty_getlock(sc);
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sc->sc_pps.driver_abi = PPS_ABI_VERSION;
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pps_init_abi(&sc->sc_pps);
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}
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void
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uart_add_sysdev(struct uart_devinfo *di)
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{
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SLIST_INSERT_HEAD(&uart_sysdevs, di, next);
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}
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const char *
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uart_getname(struct uart_class *uc)
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{
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return ((uc != NULL) ? uc->name : NULL);
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}
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struct uart_ops *
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uart_getops(struct uart_class *uc)
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{
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return ((uc != NULL) ? uc->uc_ops : NULL);
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}
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int
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uart_getrange(struct uart_class *uc)
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{
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return ((uc != NULL) ? uc->uc_range : 0);
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}
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u_int
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uart_getregshift(struct uart_class *uc)
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{
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return ((uc != NULL) ? uc->uc_rshift : 0);
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}
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u_int
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uart_getregiowidth(struct uart_class *uc)
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{
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return ((uc != NULL) ? uc->uc_riowidth : 0);
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}
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/*
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* Schedule a soft interrupt. We do this on the 0 to !0 transition
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* of the TTY pending interrupt status.
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*/
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void
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uart_sched_softih(struct uart_softc *sc, uint32_t ipend)
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{
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uint32_t new, old;
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do {
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old = sc->sc_ttypend;
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new = old | ipend;
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} while (!atomic_cmpset_32(&sc->sc_ttypend, old, new));
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if ((old & SER_INT_MASK) == 0)
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swi_sched(sc->sc_softih, 0);
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}
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/*
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* A break condition has been detected. We treat the break condition as
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* a special case that should not happen during normal operation. When
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* the break condition is to be passed to higher levels in the form of
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* a NUL character, we really want the break to be in the right place in
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* the input stream. The overhead to achieve that is not in relation to
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* the exceptional nature of the break condition, so we permit ourselves
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* to be sloppy.
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*/
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static __inline int
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uart_intr_break(void *arg)
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{
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struct uart_softc *sc = arg;
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#if defined(KDB)
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if (sc->sc_sysdev != NULL && sc->sc_sysdev->type == UART_DEV_CONSOLE) {
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if (kdb_break())
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return (0);
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}
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#endif
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if (sc->sc_opened)
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uart_sched_softih(sc, SER_INT_BREAK);
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return (0);
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}
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/*
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* Handle a receiver overrun situation. We lost at least 1 byte in the
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* input stream and it's our job to contain the situation. We grab as
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* much of the data we can, but otherwise flush the receiver FIFO to
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* create some breathing room. The net effect is that we avoid the
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* overrun condition to happen for the next X characters, where X is
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* related to the FIFO size at the cost of losing data right away.
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* So, instead of having multiple overrun interrupts in close proximity
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* to each other and possibly pessimizing UART interrupt latency for
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* other UARTs in a multiport configuration, we create a longer segment
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* of missing characters by freeing up the FIFO.
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* Each overrun condition is marked in the input buffer by a token. The
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* token represents the loss of at least one, but possible more bytes in
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* the input stream.
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*/
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static __inline int
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uart_intr_overrun(void *arg)
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{
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struct uart_softc *sc = arg;
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if (sc->sc_opened) {
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UART_RECEIVE(sc);
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if (uart_rx_put(sc, UART_STAT_OVERRUN))
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sc->sc_rxbuf[sc->sc_rxput] = UART_STAT_OVERRUN;
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uart_sched_softih(sc, SER_INT_RXREADY);
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}
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sc->sc_rxoverruns++;
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UART_FLUSH(sc, UART_FLUSH_RECEIVER);
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return (0);
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}
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/*
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* Received data ready.
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*/
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static __inline int
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uart_intr_rxready(void *arg)
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{
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struct uart_softc *sc = arg;
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#if defined(KDB)
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int rxp;
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rxp = sc->sc_rxput;
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#endif
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UART_RECEIVE(sc);
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#if defined(KDB)
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if (sc->sc_sysdev != NULL && sc->sc_sysdev->type == UART_DEV_CONSOLE) {
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while (rxp != sc->sc_rxput) {
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kdb_alt_break(sc->sc_rxbuf[rxp++], &sc->sc_altbrk);
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if (rxp == sc->sc_rxbufsz)
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rxp = 0;
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}
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}
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#endif
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if (sc->sc_opened)
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uart_sched_softih(sc, SER_INT_RXREADY);
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else
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sc->sc_rxput = sc->sc_rxget; /* Ignore received data. */
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return (1);
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}
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/*
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* Line or modem status change (OOB signalling).
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* We pass the signals to the software interrupt handler for further
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* processing. Note that we merge the delta bits, but set the state
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* bits. This is to avoid losing state transitions due to having more
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* than 1 hardware interrupt between software interrupts.
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*/
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static __inline int
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uart_intr_sigchg(void *arg)
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{
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struct uart_softc *sc = arg;
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int new, old, sig;
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sig = UART_GETSIG(sc);
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/*
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* Time pulse counting support, invoked whenever the PPS parameters are
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* currently set to capture either edge of the signal.
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*/
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if (sc->sc_pps.ppsparam.mode & PPS_CAPTUREBOTH) {
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uart_pps_process(sc, sig);
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}
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/*
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* Keep track of signal changes, even when the device is not
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* opened. This allows us to inform upper layers about a
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* possible loss of DCD and thus the existence of a (possibly)
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* different connection when we have DCD back, during the time
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* that the device was closed.
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*/
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do {
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old = sc->sc_ttypend;
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new = old & ~SER_MASK_STATE;
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new |= sig & SER_INT_SIGMASK;
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} while (!atomic_cmpset_32(&sc->sc_ttypend, old, new));
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if (sc->sc_opened)
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uart_sched_softih(sc, SER_INT_SIGCHG);
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return (1);
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}
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/*
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* The transmitter can accept more data.
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*/
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static __inline int
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uart_intr_txidle(void *arg)
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{
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struct uart_softc *sc = arg;
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if (sc->sc_txbusy) {
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sc->sc_txbusy = 0;
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uart_sched_softih(sc, SER_INT_TXIDLE);
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}
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return (0);
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}
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static int
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uart_intr(void *arg)
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{
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struct uart_softc *sc = arg;
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int cnt, ipend, testintr;
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if (sc->sc_leaving)
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return (FILTER_STRAY);
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cnt = 0;
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testintr = sc->sc_testintr;
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while ((!testintr || cnt < 20) && (ipend = UART_IPEND(sc)) != 0) {
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cnt++;
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if (ipend & SER_INT_OVERRUN)
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uart_intr_overrun(sc);
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if (ipend & SER_INT_BREAK)
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uart_intr_break(sc);
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if (ipend & SER_INT_RXREADY)
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uart_intr_rxready(sc);
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if (ipend & SER_INT_SIGCHG)
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uart_intr_sigchg(sc);
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if (ipend & SER_INT_TXIDLE)
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uart_intr_txidle(sc);
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}
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if (sc->sc_polled) {
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callout_reset(&sc->sc_timer, hz / uart_poll_freq,
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(callout_func_t *)uart_intr, sc);
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}
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return ((cnt == 0) ? FILTER_STRAY :
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((testintr && cnt == 20) ? FILTER_SCHEDULE_THREAD :
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FILTER_HANDLED));
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}
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serdev_intr_t *
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uart_bus_ihand(device_t dev, int ipend)
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{
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switch (ipend) {
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case SER_INT_BREAK:
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return (uart_intr_break);
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case SER_INT_OVERRUN:
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return (uart_intr_overrun);
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case SER_INT_RXREADY:
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return (uart_intr_rxready);
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case SER_INT_SIGCHG:
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return (uart_intr_sigchg);
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case SER_INT_TXIDLE:
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return (uart_intr_txidle);
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}
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return (NULL);
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}
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int
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uart_bus_ipend(device_t dev)
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{
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struct uart_softc *sc;
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sc = device_get_softc(dev);
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return (UART_IPEND(sc));
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}
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int
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uart_bus_sysdev(device_t dev)
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{
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struct uart_softc *sc;
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sc = device_get_softc(dev);
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return ((sc->sc_sysdev != NULL) ? 1 : 0);
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}
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int
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uart_bus_probe(device_t dev, int regshft, int regiowidth, int rclk, int rid, int chan, int quirks)
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{
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struct uart_softc *sc;
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struct uart_devinfo *sysdev;
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int error;
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sc = device_get_softc(dev);
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/*
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* All uart_class references are weak. Check that the needed
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* class has been compiled-in. Fail if not.
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*/
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if (sc->sc_class == NULL)
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return (ENXIO);
|
|
|
|
/*
|
|
* Initialize the instance. Note that the instance (=softc) does
|
|
* not necessarily match the hardware specific softc. We can't do
|
|
* anything about it now, because we may not attach to the device.
|
|
* Hardware drivers cannot use any of the class specific fields
|
|
* while probing.
|
|
*/
|
|
kobj_init((kobj_t)sc, (kobj_class_t)sc->sc_class);
|
|
sc->sc_dev = dev;
|
|
if (device_get_desc(dev) == NULL)
|
|
device_set_desc(dev, uart_getname(sc->sc_class));
|
|
|
|
/*
|
|
* Allocate the register resource. We assume that all UARTs have
|
|
* a single register window in either I/O port space or memory
|
|
* mapped I/O space. Any UART that needs multiple windows will
|
|
* consequently not be supported by this driver as-is. We try I/O
|
|
* port space first because that's the common case.
|
|
*/
|
|
sc->sc_rrid = rid;
|
|
sc->sc_rtype = SYS_RES_IOPORT;
|
|
sc->sc_rres = bus_alloc_resource_any(dev, sc->sc_rtype, &sc->sc_rrid,
|
|
RF_ACTIVE);
|
|
if (sc->sc_rres == NULL) {
|
|
sc->sc_rrid = rid;
|
|
sc->sc_rtype = SYS_RES_MEMORY;
|
|
sc->sc_rres = bus_alloc_resource_any(dev, sc->sc_rtype,
|
|
&sc->sc_rrid, RF_ACTIVE);
|
|
if (sc->sc_rres == NULL)
|
|
return (ENXIO);
|
|
}
|
|
|
|
/*
|
|
* Fill in the bus access structure and compare this device with
|
|
* a possible console device and/or a debug port. We set the flags
|
|
* in the softc so that the hardware dependent probe can adjust
|
|
* accordingly. In general, you don't want to permanently disrupt
|
|
* console I/O.
|
|
*/
|
|
sc->sc_bas.bsh = rman_get_bushandle(sc->sc_rres);
|
|
sc->sc_bas.bst = rman_get_bustag(sc->sc_rres);
|
|
sc->sc_bas.chan = chan;
|
|
sc->sc_bas.regshft = regshft;
|
|
sc->sc_bas.regiowidth = regiowidth;
|
|
sc->sc_bas.rclk = (rclk == 0) ? sc->sc_class->uc_rclk : rclk;
|
|
sc->sc_bas.busy_detect = !!(quirks & UART_F_BUSY_DETECT);
|
|
|
|
SLIST_FOREACH(sysdev, &uart_sysdevs, next) {
|
|
if (chan == sysdev->bas.chan &&
|
|
uart_cpu_eqres(&sc->sc_bas, &sysdev->bas)) {
|
|
/* XXX check if ops matches class. */
|
|
sc->sc_sysdev = sysdev;
|
|
sysdev->bas.rclk = sc->sc_bas.rclk;
|
|
}
|
|
}
|
|
|
|
error = UART_PROBE(sc);
|
|
bus_release_resource(dev, sc->sc_rtype, sc->sc_rrid, sc->sc_rres);
|
|
return ((error) ? error : BUS_PROBE_DEFAULT);
|
|
}
|
|
|
|
int
|
|
uart_bus_attach(device_t dev)
|
|
{
|
|
struct uart_softc *sc, *sc0;
|
|
const char *sep;
|
|
int error, filt;
|
|
|
|
/*
|
|
* The sc_class field defines the type of UART we're going to work
|
|
* with and thus the size of the softc. Replace the generic softc
|
|
* with one that matches the UART now that we're certain we handle
|
|
* the device.
|
|
*/
|
|
sc0 = device_get_softc(dev);
|
|
if (sc0->sc_class->size > device_get_driver(dev)->size) {
|
|
sc = malloc(sc0->sc_class->size, M_UART, M_WAITOK|M_ZERO);
|
|
bcopy(sc0, sc, sizeof(*sc));
|
|
device_set_softc(dev, sc);
|
|
} else
|
|
sc = sc0;
|
|
|
|
/*
|
|
* Now that we know the softc for this device, connect the back
|
|
* pointer from the sysdev for this device, if any
|
|
*/
|
|
if (sc->sc_sysdev != NULL)
|
|
sc->sc_sysdev->sc = sc;
|
|
|
|
/*
|
|
* Protect ourselves against interrupts while we're not completely
|
|
* finished attaching and initializing. We don't expect interrupts
|
|
* until after UART_ATTACH(), though.
|
|
*/
|
|
sc->sc_leaving = 1;
|
|
|
|
mtx_init(&sc->sc_hwmtx_s, "uart_hwmtx", NULL, MTX_SPIN);
|
|
if (sc->sc_hwmtx == NULL)
|
|
sc->sc_hwmtx = &sc->sc_hwmtx_s;
|
|
|
|
/*
|
|
* Re-allocate. We expect that the softc contains the information
|
|
* collected by uart_bus_probe() intact.
|
|
*/
|
|
sc->sc_rres = bus_alloc_resource_any(dev, sc->sc_rtype, &sc->sc_rrid,
|
|
RF_ACTIVE);
|
|
if (sc->sc_rres == NULL) {
|
|
mtx_destroy(&sc->sc_hwmtx_s);
|
|
return (ENXIO);
|
|
}
|
|
sc->sc_bas.bsh = rman_get_bushandle(sc->sc_rres);
|
|
sc->sc_bas.bst = rman_get_bustag(sc->sc_rres);
|
|
|
|
/*
|
|
* Ensure there is room for at least three full FIFOs of data in the
|
|
* receive buffer (handles the case of low-level drivers with huge
|
|
* FIFOs), and also ensure that there is no less than the historical
|
|
* size of 384 bytes (handles the typical small-FIFO case).
|
|
*/
|
|
sc->sc_rxbufsz = MAX(384, sc->sc_rxfifosz * 3);
|
|
sc->sc_rxbuf = malloc(sc->sc_rxbufsz * sizeof(*sc->sc_rxbuf),
|
|
M_UART, M_WAITOK);
|
|
sc->sc_txbuf = malloc(sc->sc_txfifosz * sizeof(*sc->sc_txbuf),
|
|
M_UART, M_WAITOK);
|
|
|
|
error = UART_ATTACH(sc);
|
|
if (error)
|
|
goto fail;
|
|
|
|
if (sc->sc_hwiflow || sc->sc_hwoflow) {
|
|
sep = "";
|
|
device_print_prettyname(dev);
|
|
if (sc->sc_hwiflow) {
|
|
printf("%sRTS iflow", sep);
|
|
sep = ", ";
|
|
}
|
|
if (sc->sc_hwoflow) {
|
|
printf("%sCTS oflow", sep);
|
|
sep = ", ";
|
|
}
|
|
printf("\n");
|
|
}
|
|
|
|
if (sc->sc_sysdev != NULL) {
|
|
if (sc->sc_sysdev->baudrate == 0) {
|
|
if (UART_IOCTL(sc, UART_IOCTL_BAUD,
|
|
(intptr_t)&sc->sc_sysdev->baudrate) != 0)
|
|
sc->sc_sysdev->baudrate = -1;
|
|
}
|
|
switch (sc->sc_sysdev->type) {
|
|
case UART_DEV_CONSOLE:
|
|
device_printf(dev, "console");
|
|
break;
|
|
case UART_DEV_DBGPORT:
|
|
device_printf(dev, "debug port");
|
|
break;
|
|
case UART_DEV_KEYBOARD:
|
|
device_printf(dev, "keyboard");
|
|
break;
|
|
default:
|
|
device_printf(dev, "unknown system device");
|
|
break;
|
|
}
|
|
printf(" (%d,%c,%d,%d)\n", sc->sc_sysdev->baudrate,
|
|
"noems"[sc->sc_sysdev->parity], sc->sc_sysdev->databits,
|
|
sc->sc_sysdev->stopbits);
|
|
}
|
|
|
|
sc->sc_leaving = 0;
|
|
sc->sc_testintr = 1;
|
|
filt = uart_intr(sc);
|
|
sc->sc_testintr = 0;
|
|
|
|
/*
|
|
* Don't use interrupts if we couldn't clear any pending interrupt
|
|
* conditions. We may have broken H/W and polling is probably the
|
|
* safest thing to do.
|
|
*/
|
|
if (filt != FILTER_SCHEDULE_THREAD && !uart_force_poll) {
|
|
sc->sc_ires = bus_alloc_resource_any(dev, SYS_RES_IRQ,
|
|
&sc->sc_irid, RF_ACTIVE | RF_SHAREABLE);
|
|
}
|
|
if (sc->sc_ires != NULL) {
|
|
error = bus_setup_intr(dev, sc->sc_ires, INTR_TYPE_TTY,
|
|
uart_intr, NULL, sc, &sc->sc_icookie);
|
|
sc->sc_fastintr = (error == 0) ? 1 : 0;
|
|
|
|
if (!sc->sc_fastintr)
|
|
error = bus_setup_intr(dev, sc->sc_ires,
|
|
INTR_TYPE_TTY | INTR_MPSAFE, NULL,
|
|
(driver_intr_t *)uart_intr, sc, &sc->sc_icookie);
|
|
|
|
if (error) {
|
|
device_printf(dev, "could not activate interrupt\n");
|
|
bus_release_resource(dev, SYS_RES_IRQ, sc->sc_irid,
|
|
sc->sc_ires);
|
|
sc->sc_ires = NULL;
|
|
}
|
|
}
|
|
if (sc->sc_ires == NULL) {
|
|
/* No interrupt resource. Force polled mode. */
|
|
sc->sc_polled = 1;
|
|
callout_init(&sc->sc_timer, 1);
|
|
callout_reset(&sc->sc_timer, hz / uart_poll_freq,
|
|
(callout_func_t *)uart_intr, sc);
|
|
}
|
|
|
|
if (bootverbose && (sc->sc_fastintr || sc->sc_polled)) {
|
|
sep = "";
|
|
device_print_prettyname(dev);
|
|
if (sc->sc_fastintr) {
|
|
printf("%sfast interrupt", sep);
|
|
sep = ", ";
|
|
}
|
|
if (sc->sc_polled) {
|
|
printf("%spolled mode (%dHz)", sep, uart_poll_freq);
|
|
sep = ", ";
|
|
}
|
|
printf("\n");
|
|
}
|
|
|
|
if (sc->sc_sysdev != NULL && sc->sc_sysdev->attach != NULL) {
|
|
if ((error = sc->sc_sysdev->attach(sc)) != 0)
|
|
goto fail;
|
|
} else {
|
|
if ((error = uart_tty_attach(sc)) != 0)
|
|
goto fail;
|
|
uart_pps_init(sc);
|
|
}
|
|
|
|
if (sc->sc_sysdev != NULL)
|
|
sc->sc_sysdev->hwmtx = sc->sc_hwmtx;
|
|
|
|
if (sc->sc_rxfifosz > 1)
|
|
SYSCTL_ADD_INT(device_get_sysctl_ctx(dev),
|
|
SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), OID_AUTO,
|
|
"rx_overruns", CTLFLAG_RD, &sc->sc_rxoverruns, 0,
|
|
"Receive overruns");
|
|
|
|
return (0);
|
|
|
|
fail:
|
|
free(sc->sc_txbuf, M_UART);
|
|
free(sc->sc_rxbuf, M_UART);
|
|
|
|
if (sc->sc_ires != NULL) {
|
|
bus_teardown_intr(dev, sc->sc_ires, sc->sc_icookie);
|
|
bus_release_resource(dev, SYS_RES_IRQ, sc->sc_irid,
|
|
sc->sc_ires);
|
|
}
|
|
bus_release_resource(dev, sc->sc_rtype, sc->sc_rrid, sc->sc_rres);
|
|
|
|
mtx_destroy(&sc->sc_hwmtx_s);
|
|
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
uart_bus_detach(device_t dev)
|
|
{
|
|
struct uart_softc *sc;
|
|
|
|
sc = device_get_softc(dev);
|
|
|
|
sc->sc_leaving = 1;
|
|
|
|
if (sc->sc_sysdev != NULL)
|
|
sc->sc_sysdev->hwmtx = NULL;
|
|
|
|
UART_DETACH(sc);
|
|
|
|
if (sc->sc_sysdev != NULL && sc->sc_sysdev->detach != NULL)
|
|
(*sc->sc_sysdev->detach)(sc);
|
|
else
|
|
uart_tty_detach(sc);
|
|
|
|
free(sc->sc_txbuf, M_UART);
|
|
free(sc->sc_rxbuf, M_UART);
|
|
|
|
if (sc->sc_ires != NULL) {
|
|
bus_teardown_intr(dev, sc->sc_ires, sc->sc_icookie);
|
|
bus_release_resource(dev, SYS_RES_IRQ, sc->sc_irid,
|
|
sc->sc_ires);
|
|
}
|
|
bus_release_resource(dev, sc->sc_rtype, sc->sc_rrid, sc->sc_rres);
|
|
|
|
mtx_destroy(&sc->sc_hwmtx_s);
|
|
|
|
if (sc->sc_class->size > device_get_driver(dev)->size) {
|
|
device_set_softc(dev, NULL);
|
|
free(sc, M_UART);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
uart_bus_resume(device_t dev)
|
|
{
|
|
struct uart_softc *sc;
|
|
|
|
sc = device_get_softc(dev);
|
|
return (UART_ATTACH(sc));
|
|
}
|
|
|
|
void
|
|
uart_grab(struct uart_devinfo *di)
|
|
{
|
|
|
|
if (di->sc)
|
|
UART_GRAB(di->sc);
|
|
}
|
|
|
|
void
|
|
uart_ungrab(struct uart_devinfo *di)
|
|
{
|
|
|
|
if (di->sc)
|
|
UART_UNGRAB(di->sc);
|
|
}
|