55dd870b96
improvements: (1) Implement new model in previously missed at91 UART driver (2) Move BREAK_TO_DEBUGGER and ALT_BREAK_TO_DEBUGGER from opt_comconsole.h to opt_kdb.h (spotted by np) (3) Garbage collect now-unused opt_comconsole.h MFC after: 3 weeks Approved by: re (bz)
580 lines
15 KiB
C
580 lines
15 KiB
C
/*-
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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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__FBSDID("$FreeBSD$");
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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 <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 "uart_if.h"
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devclass_t uart_devclass;
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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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MALLOC_DEFINE(M_UART, "UART", "UART driver");
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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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/*
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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 loosing 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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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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int rxp;
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rxp = sc->sc_rxput;
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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 loosing 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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if (sc->sc_pps.ppsparam.mode & PPS_CAPTUREBOTH) {
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if (sig & UART_SIG_DPPS) {
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pps_capture(&sc->sc_pps);
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pps_event(&sc->sc_pps, (sig & UART_SIG_PPS) ?
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PPS_CAPTUREASSERT : PPS_CAPTURECLEAR);
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}
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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 flag = 0, ipend;
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while (!sc->sc_leaving && (ipend = UART_IPEND(sc)) != 0) {
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flag = 1;
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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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return((flag)?FILTER_HANDLED:FILTER_STRAY);
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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 rclk, int rid, int chan)
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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);
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/*
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* Initialize the instance. Note that the instance (=softc) does
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* not necessarily match the hardware specific softc. We can't do
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* anything about it now, because we may not attach to the device.
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* Hardware drivers cannot use any of the class specific fields
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* while probing.
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*/
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kobj_init((kobj_t)sc, (kobj_class_t)sc->sc_class);
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sc->sc_dev = dev;
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if (device_get_desc(dev) == NULL)
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device_set_desc(dev, uart_getname(sc->sc_class));
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/*
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* Allocate the register resource. We assume that all UARTs have
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* a single register window in either I/O port space or memory
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* mapped I/O space. Any UART that needs multiple windows will
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* consequently not be supported by this driver as-is. We try I/O
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* port space first because that's the common case.
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*/
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sc->sc_rrid = rid;
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sc->sc_rtype = SYS_RES_IOPORT;
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sc->sc_rres = bus_alloc_resource(dev, sc->sc_rtype, &sc->sc_rrid,
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0, ~0, uart_getrange(sc->sc_class), RF_ACTIVE);
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if (sc->sc_rres == NULL) {
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sc->sc_rrid = rid;
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sc->sc_rtype = SYS_RES_MEMORY;
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sc->sc_rres = bus_alloc_resource(dev, sc->sc_rtype,
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&sc->sc_rrid, 0, ~0, uart_getrange(sc->sc_class),
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RF_ACTIVE);
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if (sc->sc_rres == NULL)
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return (ENXIO);
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}
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/*
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* Fill in the bus access structure and compare this device with
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* a possible console device and/or a debug port. We set the flags
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* in the softc so that the hardware dependent probe can adjust
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* accordingly. In general, you don't want to permanently disrupt
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* console I/O.
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*/
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sc->sc_bas.bsh = rman_get_bushandle(sc->sc_rres);
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sc->sc_bas.bst = rman_get_bustag(sc->sc_rres);
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sc->sc_bas.chan = chan;
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sc->sc_bas.regshft = regshft;
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sc->sc_bas.rclk = (rclk == 0) ? sc->sc_class->uc_rclk : rclk;
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SLIST_FOREACH(sysdev, &uart_sysdevs, next) {
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if (chan == sysdev->bas.chan &&
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uart_cpu_eqres(&sc->sc_bas, &sysdev->bas)) {
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/* XXX check if ops matches class. */
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sc->sc_sysdev = sysdev;
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sysdev->bas.rclk = sc->sc_bas.rclk;
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}
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}
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error = UART_PROBE(sc);
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bus_release_resource(dev, sc->sc_rtype, sc->sc_rrid, sc->sc_rres);
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return ((error) ? error : BUS_PROBE_DEFAULT);
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}
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int
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uart_bus_attach(device_t dev)
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{
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struct uart_softc *sc, *sc0;
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const char *sep;
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int error;
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/*
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* The sc_class field defines the type of UART we're going to work
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* with and thus the size of the softc. Replace the generic softc
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* with one that matches the UART now that we're certain we handle
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* the device.
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*/
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sc0 = device_get_softc(dev);
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if (sc0->sc_class->size > sizeof(*sc)) {
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sc = malloc(sc0->sc_class->size, M_UART, M_WAITOK|M_ZERO);
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bcopy(sc0, sc, sizeof(*sc));
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device_set_softc(dev, sc);
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} else
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sc = sc0;
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/*
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* Protect ourselves against interrupts while we're not completely
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* finished attaching and initializing. We don't expect interrupts
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* until after UART_ATTACH() though.
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*/
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sc->sc_leaving = 1;
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mtx_init(&sc->sc_hwmtx_s, "uart_hwmtx", NULL, MTX_SPIN);
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if (sc->sc_hwmtx == NULL)
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sc->sc_hwmtx = &sc->sc_hwmtx_s;
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/*
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* Re-allocate. We expect that the softc contains the information
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* collected by uart_bus_probe() intact.
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*/
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sc->sc_rres = bus_alloc_resource(dev, sc->sc_rtype, &sc->sc_rrid,
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0, ~0, uart_getrange(sc->sc_class), RF_ACTIVE);
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if (sc->sc_rres == NULL) {
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mtx_destroy(&sc->sc_hwmtx_s);
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return (ENXIO);
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}
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sc->sc_bas.bsh = rman_get_bushandle(sc->sc_rres);
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sc->sc_bas.bst = rman_get_bustag(sc->sc_rres);
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sc->sc_irid = 0;
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sc->sc_ires = bus_alloc_resource_any(dev, SYS_RES_IRQ, &sc->sc_irid,
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RF_ACTIVE | RF_SHAREABLE);
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if (sc->sc_ires != NULL) {
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error = bus_setup_intr(dev,
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sc->sc_ires, INTR_TYPE_TTY,
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uart_intr, NULL, sc, &sc->sc_icookie);
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if (error)
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error = bus_setup_intr(dev,
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sc->sc_ires, INTR_TYPE_TTY | INTR_MPSAFE,
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NULL, (driver_intr_t *)uart_intr, sc, &sc->sc_icookie);
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else
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sc->sc_fastintr = 1;
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if (error) {
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device_printf(dev, "could not activate interrupt\n");
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bus_release_resource(dev, SYS_RES_IRQ, sc->sc_irid,
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sc->sc_ires);
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sc->sc_ires = NULL;
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}
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}
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if (sc->sc_ires == NULL) {
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/* XXX no interrupt resource. Force polled mode. */
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sc->sc_polled = 1;
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}
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sc->sc_rxbufsz = 384;
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sc->sc_rxbuf = malloc(sc->sc_rxbufsz * sizeof(*sc->sc_rxbuf),
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M_UART, M_WAITOK);
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sc->sc_txbuf = malloc(sc->sc_txfifosz * sizeof(*sc->sc_txbuf),
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M_UART, M_WAITOK);
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error = UART_ATTACH(sc);
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if (error)
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goto fail;
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if (sc->sc_hwiflow || sc->sc_hwoflow) {
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sep = "";
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device_print_prettyname(dev);
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if (sc->sc_hwiflow) {
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printf("%sRTS iflow", sep);
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sep = ", ";
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}
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if (sc->sc_hwoflow) {
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printf("%sCTS oflow", sep);
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sep = ", ";
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}
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printf("\n");
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}
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if (bootverbose && (sc->sc_fastintr || sc->sc_polled)) {
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sep = "";
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device_print_prettyname(dev);
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if (sc->sc_fastintr) {
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printf("%sfast interrupt", sep);
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sep = ", ";
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}
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if (sc->sc_polled) {
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printf("%spolled mode", sep);
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sep = ", ";
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}
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printf("\n");
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}
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if (sc->sc_sysdev != NULL) {
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if (sc->sc_sysdev->baudrate == 0) {
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if (UART_IOCTL(sc, UART_IOCTL_BAUD,
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(intptr_t)&sc->sc_sysdev->baudrate) != 0)
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sc->sc_sysdev->baudrate = -1;
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}
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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_pps.ppscap = PPS_CAPTUREBOTH;
|
|
pps_init(&sc->sc_pps);
|
|
|
|
error = (sc->sc_sysdev != NULL && sc->sc_sysdev->attach != NULL)
|
|
? (*sc->sc_sysdev->attach)(sc) : uart_tty_attach(sc);
|
|
if (error)
|
|
goto fail;
|
|
|
|
if (sc->sc_sysdev != NULL)
|
|
sc->sc_sysdev->hwmtx = sc->sc_hwmtx;
|
|
|
|
sc->sc_leaving = 0;
|
|
uart_intr(sc);
|
|
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 > sizeof(*sc)) {
|
|
device_set_softc(dev, NULL);
|
|
free(sc, M_UART);
|
|
} else
|
|
device_set_softc(dev, NULL);
|
|
|
|
return (0);
|
|
}
|