eed4bd22ad
Most affect comments, very few have user-visible effects.
2643 lines
69 KiB
C
2643 lines
69 KiB
C
/*-
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* Copyright (c) 1991 The Regents of the University of California.
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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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* 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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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)com.c 7.5 (Berkeley) 5/16/91
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* from: i386/isa sio.c,v 1.234
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_compat.h"
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#include "opt_gdb.h"
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#include "opt_kdb.h"
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#include "opt_sio.h"
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/*
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* Serial driver, based on 386BSD-0.1 com driver.
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* Mostly rewritten to use pseudo-DMA.
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* Works for National Semiconductor NS8250-NS16550AF UARTs.
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* COM driver, based on HP dca driver.
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*
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* Changes for PC Card integration:
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* - Added PC Card driver table and handlers
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*/
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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/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/limits.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/reboot.h>
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#include <sys/serial.h>
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#include <sys/sysctl.h>
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#include <sys/syslog.h>
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#include <sys/tty.h>
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#include <machine/bus.h>
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#include <sys/rman.h>
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#include <sys/timepps.h>
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#include <sys/uio.h>
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#include <sys/cons.h>
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#include <isa/isavar.h>
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#include <machine/resource.h>
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#include <dev/sio/sioreg.h>
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#include <dev/sio/siovar.h>
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#ifdef COM_ESP
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#include <dev/ic/esp.h>
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#endif
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#include <dev/ic/ns16550.h>
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#define LOTS_OF_EVENTS 64 /* helps separate urgent events from input */
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#ifdef COM_MULTIPORT
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/* checks in flags for multiport and which is multiport "master chip"
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* for a given card
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*/
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#define COM_ISMULTIPORT(flags) ((flags) & 0x01)
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#define COM_MPMASTER(flags) (((flags) >> 8) & 0x0ff)
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#define COM_NOTAST4(flags) ((flags) & 0x04)
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#else
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#define COM_ISMULTIPORT(flags) (0)
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#endif /* COM_MULTIPORT */
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#define COM_C_IIR_TXRDYBUG 0x80000
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#define COM_CONSOLE(flags) ((flags) & 0x10)
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#define COM_DEBUGGER(flags) ((flags) & 0x80)
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#define COM_FIFOSIZE(flags) (((flags) & 0xff000000) >> 24)
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#define COM_FORCECONSOLE(flags) ((flags) & 0x20)
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#define COM_IIR_TXRDYBUG(flags) ((flags) & COM_C_IIR_TXRDYBUG)
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#define COM_LLCONSOLE(flags) ((flags) & 0x40)
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#define COM_LOSESOUTINTS(flags) ((flags) & 0x08)
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#define COM_NOFIFO(flags) ((flags) & 0x02)
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#define COM_NOPROBE(flags) ((flags) & 0x40000)
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#define COM_NOSCR(flags) ((flags) & 0x100000)
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#define COM_PPSCTS(flags) ((flags) & 0x10000)
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#define COM_ST16650A(flags) ((flags) & 0x20000)
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#define COM_TI16754(flags) ((flags) & 0x200000)
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#define sio_getreg(com, off) \
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(bus_space_read_1((com)->bst, (com)->bsh, (off)))
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#define sio_setreg(com, off, value) \
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(bus_space_write_1((com)->bst, (com)->bsh, (off), (value)))
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/*
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* com state bits.
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* (CS_BUSY | CS_TTGO) and (CS_BUSY | CS_TTGO | CS_ODEVREADY) must be higher
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* than the other bits so that they can be tested as a group without masking
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* off the low bits.
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*
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* The following com and tty flags correspond closely:
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* CS_BUSY = TS_BUSY (maintained by comstart(), siopoll() and
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* comstop())
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* CS_TTGO = ~TS_TTSTOP (maintained by comparam() and comstart())
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* CS_CTS_OFLOW = CCTS_OFLOW (maintained by comparam())
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* CS_RTS_IFLOW = CRTS_IFLOW (maintained by comparam())
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* TS_FLUSH is not used.
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* XXX I think TIOCSETA doesn't clear TS_TTSTOP when it clears IXON.
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* XXX CS_*FLOW should be CF_*FLOW in com->flags (control flags not state).
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*/
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#define CS_BUSY 0x80 /* output in progress */
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#define CS_TTGO 0x40 /* output not stopped by XOFF */
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#define CS_ODEVREADY 0x20 /* external device h/w ready (CTS) */
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#define CS_CHECKMSR 1 /* check of MSR scheduled */
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#define CS_CTS_OFLOW 2 /* use CTS output flow control */
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#define CS_ODONE 4 /* output completed */
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#define CS_RTS_IFLOW 8 /* use RTS input flow control */
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#define CSE_BUSYCHECK 1 /* siobusycheck() scheduled */
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static char const * const error_desc[] = {
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#define CE_OVERRUN 0
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"silo overflow",
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#define CE_INTERRUPT_BUF_OVERFLOW 1
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"interrupt-level buffer overflow",
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#define CE_TTY_BUF_OVERFLOW 2
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"tty-level buffer overflow",
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};
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#define CE_NTYPES 3
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#define CE_RECORD(com, errnum) (++(com)->delta_error_counts[errnum])
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/* types. XXX - should be elsewhere */
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typedef u_int Port_t; /* hardware port */
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typedef u_char bool_t; /* boolean */
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/* queue of linear buffers */
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struct lbq {
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u_char *l_head; /* next char to process */
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u_char *l_tail; /* one past the last char to process */
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struct lbq *l_next; /* next in queue */
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bool_t l_queued; /* nonzero if queued */
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};
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/* com device structure */
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struct com_s {
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u_char state; /* miscellaneous flag bits */
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u_char cfcr_image; /* copy of value written to CFCR */
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#ifdef COM_ESP
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bool_t esp; /* is this unit a hayes esp board? */
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#endif
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u_char extra_state; /* more flag bits, separate for order trick */
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u_char fifo_image; /* copy of value written to FIFO */
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bool_t hasfifo; /* nonzero for 16550 UARTs */
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bool_t loses_outints; /* nonzero if device loses output interrupts */
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u_char mcr_image; /* copy of value written to MCR */
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#ifdef COM_MULTIPORT
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bool_t multiport; /* is this unit part of a multiport device? */
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#endif /* COM_MULTIPORT */
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bool_t no_irq; /* nonzero if irq is not attached */
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bool_t gone; /* hardware disappeared */
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bool_t poll; /* nonzero if polling is required */
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bool_t poll_output; /* nonzero if polling for output is required */
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bool_t st16650a; /* nonzero if Startech 16650A compatible */
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int unit; /* unit number */
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u_int flags; /* copy of device flags */
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u_int tx_fifo_size;
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/*
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* The high level of the driver never reads status registers directly
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* because there would be too many side effects to handle conveniently.
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* Instead, it reads copies of the registers stored here by the
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* interrupt handler.
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*/
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u_char last_modem_status; /* last MSR read by intr handler */
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u_char prev_modem_status; /* last MSR handled by high level */
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u_char *ibuf; /* start of input buffer */
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u_char *ibufend; /* end of input buffer */
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u_char *ibufold; /* old input buffer, to be freed */
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u_char *ihighwater; /* threshold in input buffer */
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u_char *iptr; /* next free spot in input buffer */
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int ibufsize; /* size of ibuf (not include error bytes) */
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int ierroff; /* offset of error bytes in ibuf */
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struct lbq obufq; /* head of queue of output buffers */
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struct lbq obufs[2]; /* output buffers */
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bus_space_tag_t bst;
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bus_space_handle_t bsh;
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Port_t data_port; /* i/o ports */
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#ifdef COM_ESP
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Port_t esp_port;
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#endif
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Port_t int_ctl_port;
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Port_t int_id_port;
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Port_t modem_ctl_port;
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Port_t line_status_port;
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Port_t modem_status_port;
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struct tty *tp; /* cross reference */
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struct pps_state pps;
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int pps_bit;
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#ifdef KDB
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int alt_brk_state;
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#endif
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u_long bytes_in; /* statistics */
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u_long bytes_out;
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u_int delta_error_counts[CE_NTYPES];
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u_long error_counts[CE_NTYPES];
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u_long rclk;
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struct resource *irqres;
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struct resource *ioportres;
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int ioportrid;
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void *cookie;
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/*
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* Data area for output buffers. Someday we should build the output
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* buffer queue without copying data.
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*/
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u_char obuf1[256];
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u_char obuf2[256];
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};
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#ifdef COM_ESP
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static int espattach(struct com_s *com, Port_t esp_port);
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#endif
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static void combreak(struct tty *tp, int sig);
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static timeout_t siobusycheck;
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static u_int siodivisor(u_long rclk, speed_t speed);
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static void comclose(struct tty *tp);
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static int comopen(struct tty *tp, struct cdev *dev);
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static void sioinput(struct com_s *com);
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static void siointr1(struct com_s *com);
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static int siointr(void *arg);
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static int commodem(struct tty *tp, int sigon, int sigoff);
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static int comparam(struct tty *tp, struct termios *t);
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static void siopoll(void *);
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static void siosettimeout(void);
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static int siosetwater(struct com_s *com, speed_t speed);
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static void comstart(struct tty *tp);
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static void comstop(struct tty *tp, int rw);
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static timeout_t comwakeup;
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char sio_driver_name[] = "sio";
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static struct mtx sio_lock;
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static int sio_inited;
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/* table and macro for fast conversion from a unit number to its com struct */
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devclass_t sio_devclass;
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/*
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* XXX Assmues that devclass_get_device, devclass_get_softc and
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* device_get_softc are fast interrupt safe. The current implementation
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* of these functions are.
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*/
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#define com_addr(unit) ((struct com_s *) \
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devclass_get_softc(sio_devclass, unit)) /* XXX */
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int comconsole = -1;
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static volatile speed_t comdefaultrate = CONSPEED;
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static u_long comdefaultrclk = DEFAULT_RCLK;
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SYSCTL_ULONG(_machdep, OID_AUTO, conrclk, CTLFLAG_RW, &comdefaultrclk, 0, "");
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static speed_t gdbdefaultrate = GDBSPEED;
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SYSCTL_UINT(_machdep, OID_AUTO, gdbspeed, CTLFLAG_RW,
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&gdbdefaultrate, GDBSPEED, "");
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static u_int com_events; /* input chars + weighted output completions */
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static Port_t siocniobase;
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static int siocnunit = -1;
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static void *sio_slow_ih;
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static void *sio_fast_ih;
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static int sio_timeout;
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static int sio_timeouts_until_log;
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static struct callout_handle sio_timeout_handle
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= CALLOUT_HANDLE_INITIALIZER(&sio_timeout_handle);
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static int sio_numunits;
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#ifdef GDB
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static Port_t siogdbiobase = 0;
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#endif
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#ifdef COM_ESP
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/* XXX configure this properly. */
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/* XXX quite broken for new-bus. */
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static Port_t likely_com_ports[] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8, };
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static Port_t likely_esp_ports[] = { 0x140, 0x180, 0x280, 0 };
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#endif
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/*
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* handle sysctl read/write requests for console speed
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*
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* In addition to setting comdefaultrate for I/O through /dev/console,
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* also set the initial and lock values for the /dev/ttyXX device
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* if there is one associated with the console. Finally, if the /dev/tty
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* device has already been open, change the speed on the open running port
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* itself.
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*/
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static int
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sysctl_machdep_comdefaultrate(SYSCTL_HANDLER_ARGS)
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{
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int error, s;
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speed_t newspeed;
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struct com_s *com;
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struct tty *tp;
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newspeed = comdefaultrate;
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error = sysctl_handle_opaque(oidp, &newspeed, sizeof newspeed, req);
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if (error || !req->newptr)
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return (error);
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comdefaultrate = newspeed;
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if (comconsole < 0) /* serial console not selected? */
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return (0);
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com = com_addr(comconsole);
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if (com == NULL)
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return (ENXIO);
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tp = com->tp;
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if (tp == NULL)
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return (ENXIO);
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/*
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* set the initial and lock rates for /dev/ttydXX and /dev/cuaXX
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* (note, the lock rates really are boolean -- if non-zero, disallow
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* speed changes)
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*/
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tp->t_init_in.c_ispeed = tp->t_init_in.c_ospeed =
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tp->t_lock_in.c_ispeed = tp->t_lock_in.c_ospeed =
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tp->t_init_out.c_ispeed = tp->t_init_out.c_ospeed =
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tp->t_lock_out.c_ispeed = tp->t_lock_out.c_ospeed = comdefaultrate;
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if (tp->t_state & TS_ISOPEN) {
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tp->t_termios.c_ispeed =
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tp->t_termios.c_ospeed = comdefaultrate;
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s = spltty();
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error = comparam(tp, &tp->t_termios);
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splx(s);
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}
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return error;
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}
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SYSCTL_PROC(_machdep, OID_AUTO, conspeed, CTLTYPE_INT | CTLFLAG_RWTUN | CTLFLAG_NOFETCH,
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0, 0, sysctl_machdep_comdefaultrate, "I", "");
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TUNABLE_INT("machdep.conspeed", __DEVOLATILE(int *, &comdefaultrate));
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#define SET_FLAG(dev, bit) device_set_flags(dev, device_get_flags(dev) | (bit))
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#define CLR_FLAG(dev, bit) device_set_flags(dev, device_get_flags(dev) & ~(bit))
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/*
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* Unload the driver and clear the table.
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* XXX this is mostly wrong.
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* XXX TODO:
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* This is usually called when the card is ejected, but
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* can be caused by a kldunload of a controller driver.
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* The idea is to reset the driver's view of the device
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* and ensure that any driver entry points such as
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* read and write do not hang.
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*/
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int
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siodetach(device_t dev)
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{
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struct com_s *com;
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com = (struct com_s *) device_get_softc(dev);
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if (com == NULL) {
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device_printf(dev, "NULL com in siounload\n");
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return (0);
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}
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com->gone = TRUE;
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if (com->tp)
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ttyfree(com->tp);
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if (com->irqres) {
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bus_teardown_intr(dev, com->irqres, com->cookie);
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bus_release_resource(dev, SYS_RES_IRQ, 0, com->irqres);
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}
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if (com->ioportres)
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bus_release_resource(dev, SYS_RES_IOPORT, com->ioportrid,
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com->ioportres);
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if (com->ibuf != NULL)
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free(com->ibuf, M_DEVBUF);
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device_set_softc(dev, NULL);
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free(com, M_DEVBUF);
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return (0);
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}
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int
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sioprobe(dev, xrid, rclk, noprobe)
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device_t dev;
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int xrid;
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u_long rclk;
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int noprobe;
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{
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#if 0
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static bool_t already_init;
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device_t xdev;
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#endif
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struct com_s *com;
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u_int divisor;
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bool_t failures[10];
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int fn;
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device_t idev;
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Port_t iobase;
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intrmask_t irqmap[4];
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intrmask_t irqs;
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u_char mcr_image;
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int result;
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u_long xirq;
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u_int flags = device_get_flags(dev);
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int rid;
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struct resource *port;
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rid = xrid;
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port = bus_alloc_resource_anywhere(dev, SYS_RES_IOPORT, &rid,
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IO_COMSIZE, RF_ACTIVE);
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if (!port)
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return (ENXIO);
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com = malloc(sizeof(*com), M_DEVBUF, M_NOWAIT | M_ZERO);
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if (com == NULL) {
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bus_release_resource(dev, SYS_RES_IOPORT, rid, port);
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return (ENOMEM);
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}
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device_set_softc(dev, com);
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com->bst = rman_get_bustag(port);
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com->bsh = rman_get_bushandle(port);
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if (rclk == 0)
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rclk = DEFAULT_RCLK;
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com->rclk = rclk;
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|
|
while (sio_inited != 2)
|
|
if (atomic_cmpset_int(&sio_inited, 0, 1)) {
|
|
mtx_init(&sio_lock, sio_driver_name, NULL,
|
|
(comconsole != -1) ?
|
|
MTX_SPIN | MTX_QUIET : MTX_SPIN);
|
|
atomic_store_rel_int(&sio_inited, 2);
|
|
}
|
|
|
|
#if 0
|
|
/*
|
|
* XXX this is broken - when we are first called, there are no
|
|
* previously configured IO ports. We could hard code
|
|
* 0x3f8, 0x2f8, 0x3e8, 0x2e8 etc but that's probably worse.
|
|
* This code has been doing nothing since the conversion since
|
|
* "count" is zero the first time around.
|
|
*/
|
|
if (!already_init) {
|
|
/*
|
|
* Turn off MCR_IENABLE for all likely serial ports. An unused
|
|
* port with its MCR_IENABLE gate open will inhibit interrupts
|
|
* from any used port that shares the interrupt vector.
|
|
* XXX the gate enable is elsewhere for some multiports.
|
|
*/
|
|
device_t *devs;
|
|
int count, i, xioport;
|
|
|
|
devclass_get_devices(sio_devclass, &devs, &count);
|
|
for (i = 0; i < count; i++) {
|
|
xdev = devs[i];
|
|
if (device_is_enabled(xdev) &&
|
|
bus_get_resource(xdev, SYS_RES_IOPORT, 0, &xioport,
|
|
NULL) == 0)
|
|
outb(xioport + com_mcr, 0);
|
|
}
|
|
free(devs, M_TEMP);
|
|
already_init = TRUE;
|
|
}
|
|
#endif
|
|
|
|
if (COM_LLCONSOLE(flags)) {
|
|
printf("sio%d: reserved for low-level i/o\n",
|
|
device_get_unit(dev));
|
|
bus_release_resource(dev, SYS_RES_IOPORT, rid, port);
|
|
device_set_softc(dev, NULL);
|
|
free(com, M_DEVBUF);
|
|
return (ENXIO);
|
|
}
|
|
|
|
/*
|
|
* If the device is on a multiport card and has an AST/4
|
|
* compatible interrupt control register, initialize this
|
|
* register and prepare to leave MCR_IENABLE clear in the mcr.
|
|
* Otherwise, prepare to set MCR_IENABLE in the mcr.
|
|
* Point idev to the device struct giving the correct id_irq.
|
|
* This is the struct for the master device if there is one.
|
|
*/
|
|
idev = dev;
|
|
mcr_image = MCR_IENABLE;
|
|
#ifdef COM_MULTIPORT
|
|
if (COM_ISMULTIPORT(flags)) {
|
|
Port_t xiobase;
|
|
u_long io;
|
|
|
|
idev = devclass_get_device(sio_devclass, COM_MPMASTER(flags));
|
|
if (idev == NULL) {
|
|
printf("sio%d: master device %d not configured\n",
|
|
device_get_unit(dev), COM_MPMASTER(flags));
|
|
idev = dev;
|
|
}
|
|
if (!COM_NOTAST4(flags)) {
|
|
if (bus_get_resource(idev, SYS_RES_IOPORT, 0, &io,
|
|
NULL) == 0) {
|
|
xiobase = io;
|
|
if (bus_get_resource(idev, SYS_RES_IRQ, 0,
|
|
NULL, NULL) == 0)
|
|
outb(xiobase + com_scr, 0x80);
|
|
else
|
|
outb(xiobase + com_scr, 0);
|
|
}
|
|
mcr_image = 0;
|
|
}
|
|
}
|
|
#endif /* COM_MULTIPORT */
|
|
if (bus_get_resource(idev, SYS_RES_IRQ, 0, NULL, NULL) != 0)
|
|
mcr_image = 0;
|
|
|
|
bzero(failures, sizeof failures);
|
|
iobase = rman_get_start(port);
|
|
|
|
/*
|
|
* We don't want to get actual interrupts, just masked ones.
|
|
* Interrupts from this line should already be masked in the ICU,
|
|
* but mask them in the processor as well in case there are some
|
|
* (misconfigured) shared interrupts.
|
|
*/
|
|
mtx_lock_spin(&sio_lock);
|
|
/* EXTRA DELAY? */
|
|
|
|
/*
|
|
* For the TI16754 chips, set prescaler to 1 (4 is often the
|
|
* default after-reset value) as otherwise it's impossible to
|
|
* get highest baudrates.
|
|
*/
|
|
if (COM_TI16754(flags)) {
|
|
u_char cfcr, efr;
|
|
|
|
cfcr = sio_getreg(com, com_cfcr);
|
|
sio_setreg(com, com_cfcr, CFCR_EFR_ENABLE);
|
|
efr = sio_getreg(com, com_efr);
|
|
/* Unlock extended features to turn off prescaler. */
|
|
sio_setreg(com, com_efr, efr | EFR_EFE);
|
|
/* Disable EFR. */
|
|
sio_setreg(com, com_cfcr, (cfcr != CFCR_EFR_ENABLE) ? cfcr : 0);
|
|
/* Turn off prescaler. */
|
|
sio_setreg(com, com_mcr,
|
|
sio_getreg(com, com_mcr) & ~MCR_PRESCALE);
|
|
sio_setreg(com, com_cfcr, CFCR_EFR_ENABLE);
|
|
sio_setreg(com, com_efr, efr);
|
|
sio_setreg(com, com_cfcr, cfcr);
|
|
}
|
|
|
|
/*
|
|
* Initialize the speed and the word size and wait long enough to
|
|
* drain the maximum of 16 bytes of junk in device output queues.
|
|
* The speed is undefined after a master reset and must be set
|
|
* before relying on anything related to output. There may be
|
|
* junk after a (very fast) soft reboot and (apparently) after
|
|
* master reset.
|
|
* XXX what about the UART bug avoided by waiting in comparam()?
|
|
* We don't want to to wait long enough to drain at 2 bps.
|
|
*/
|
|
if (iobase == siocniobase)
|
|
DELAY((16 + 1) * 1000000 / (comdefaultrate / 10));
|
|
else {
|
|
sio_setreg(com, com_cfcr, CFCR_DLAB | CFCR_8BITS);
|
|
divisor = siodivisor(rclk, SIO_TEST_SPEED);
|
|
sio_setreg(com, com_dlbl, divisor & 0xff);
|
|
sio_setreg(com, com_dlbh, divisor >> 8);
|
|
sio_setreg(com, com_cfcr, CFCR_8BITS);
|
|
DELAY((16 + 1) * 1000000 / (SIO_TEST_SPEED / 10));
|
|
}
|
|
|
|
/*
|
|
* Enable the interrupt gate and disable device interrupts. This
|
|
* should leave the device driving the interrupt line low and
|
|
* guarantee an edge trigger if an interrupt can be generated.
|
|
*/
|
|
/* EXTRA DELAY? */
|
|
sio_setreg(com, com_mcr, mcr_image);
|
|
sio_setreg(com, com_ier, 0);
|
|
DELAY(1000); /* XXX */
|
|
irqmap[0] = isa_irq_pending();
|
|
|
|
/*
|
|
* Attempt to set loopback mode so that we can send a null byte
|
|
* without annoying any external device.
|
|
*/
|
|
/* EXTRA DELAY? */
|
|
sio_setreg(com, com_mcr, mcr_image | MCR_LOOPBACK);
|
|
|
|
/*
|
|
* Attempt to generate an output interrupt. On 8250's, setting
|
|
* IER_ETXRDY generates an interrupt independent of the current
|
|
* setting and independent of whether the THR is empty. On 16450's,
|
|
* setting IER_ETXRDY generates an interrupt independent of the
|
|
* current setting. On 16550A's, setting IER_ETXRDY only
|
|
* generates an interrupt when IER_ETXRDY is not already set.
|
|
*/
|
|
sio_setreg(com, com_ier, IER_ETXRDY);
|
|
|
|
/*
|
|
* On some 16x50 incompatibles, setting IER_ETXRDY doesn't generate
|
|
* an interrupt. They'd better generate one for actually doing
|
|
* output. Loopback may be broken on the same incompatibles but
|
|
* it's unlikely to do more than allow the null byte out.
|
|
*/
|
|
sio_setreg(com, com_data, 0);
|
|
if (iobase == siocniobase)
|
|
DELAY((1 + 2) * 1000000 / (comdefaultrate / 10));
|
|
else
|
|
DELAY((1 + 2) * 1000000 / (SIO_TEST_SPEED / 10));
|
|
|
|
/*
|
|
* Turn off loopback mode so that the interrupt gate works again
|
|
* (MCR_IENABLE was hidden). This should leave the device driving
|
|
* an interrupt line high. It doesn't matter if the interrupt
|
|
* line oscillates while we are not looking at it, since interrupts
|
|
* are disabled.
|
|
*/
|
|
/* EXTRA DELAY? */
|
|
sio_setreg(com, com_mcr, mcr_image);
|
|
|
|
/*
|
|
* It seems my Xircom CBEM56G Cardbus modem wants to be reset
|
|
* to 8 bits *again*, or else probe test 0 will fail.
|
|
* gwk@sgi.com, 4/19/2001
|
|
*/
|
|
sio_setreg(com, com_cfcr, CFCR_8BITS);
|
|
|
|
/*
|
|
* Some PCMCIA cards (Palido 321s, DC-1S, ...) have the "TXRDY bug",
|
|
* so we probe for a buggy IIR_TXRDY implementation even in the
|
|
* noprobe case. We don't probe for it in the !noprobe case because
|
|
* noprobe is always set for PCMCIA cards and the problem is not
|
|
* known to affect any other cards.
|
|
*/
|
|
if (noprobe) {
|
|
/* Read IIR a few times. */
|
|
for (fn = 0; fn < 2; fn ++) {
|
|
DELAY(10000);
|
|
failures[6] = sio_getreg(com, com_iir);
|
|
}
|
|
|
|
/* IIR_TXRDY should be clear. Is it? */
|
|
result = 0;
|
|
if (failures[6] & IIR_TXRDY) {
|
|
/*
|
|
* No. We seem to have the bug. Does our fix for
|
|
* it work?
|
|
*/
|
|
sio_setreg(com, com_ier, 0);
|
|
if (sio_getreg(com, com_iir) & IIR_NOPEND) {
|
|
/* Yes. We discovered the TXRDY bug! */
|
|
SET_FLAG(dev, COM_C_IIR_TXRDYBUG);
|
|
} else {
|
|
/* No. Just fail. XXX */
|
|
result = ENXIO;
|
|
sio_setreg(com, com_mcr, 0);
|
|
}
|
|
} else {
|
|
/* Yes. No bug. */
|
|
CLR_FLAG(dev, COM_C_IIR_TXRDYBUG);
|
|
}
|
|
sio_setreg(com, com_ier, 0);
|
|
sio_setreg(com, com_cfcr, CFCR_8BITS);
|
|
mtx_unlock_spin(&sio_lock);
|
|
bus_release_resource(dev, SYS_RES_IOPORT, rid, port);
|
|
if (iobase == siocniobase)
|
|
result = 0;
|
|
/*
|
|
* XXX: Since we don't return 0, we shouldn't be relying on
|
|
* the softc that we set to persist to the call to attach
|
|
* since other probe routines may be called, and the malloc
|
|
* here causes subr_bus to not allocate anything for the
|
|
* other probes. Instead, this softc is preserved and other
|
|
* probe routines can corrupt it.
|
|
*/
|
|
if (result != 0) {
|
|
device_set_softc(dev, NULL);
|
|
free(com, M_DEVBUF);
|
|
}
|
|
return (result == 0 ? BUS_PROBE_DEFAULT + 1 : result);
|
|
}
|
|
|
|
/*
|
|
* Check that
|
|
* o the CFCR, IER and MCR in UART hold the values written to them
|
|
* (the values happen to be all distinct - this is good for
|
|
* avoiding false positive tests from bus echoes).
|
|
* o an output interrupt is generated and its vector is correct.
|
|
* o the interrupt goes away when the IIR in the UART is read.
|
|
*/
|
|
/* EXTRA DELAY? */
|
|
failures[0] = sio_getreg(com, com_cfcr) - CFCR_8BITS;
|
|
failures[1] = sio_getreg(com, com_ier) - IER_ETXRDY;
|
|
failures[2] = sio_getreg(com, com_mcr) - mcr_image;
|
|
DELAY(10000); /* Some internal modems need this time */
|
|
irqmap[1] = isa_irq_pending();
|
|
failures[4] = (sio_getreg(com, com_iir) & IIR_IMASK) - IIR_TXRDY;
|
|
DELAY(1000); /* XXX */
|
|
irqmap[2] = isa_irq_pending();
|
|
failures[6] = (sio_getreg(com, com_iir) & IIR_IMASK) - IIR_NOPEND;
|
|
|
|
/*
|
|
* Turn off all device interrupts and check that they go off properly.
|
|
* Leave MCR_IENABLE alone. For ports without a master port, it gates
|
|
* the OUT2 output of the UART to
|
|
* the ICU input. Closing the gate would give a floating ICU input
|
|
* (unless there is another device driving it) and spurious interrupts.
|
|
* (On the system that this was first tested on, the input floats high
|
|
* and gives a (masked) interrupt as soon as the gate is closed.)
|
|
*/
|
|
sio_setreg(com, com_ier, 0);
|
|
sio_setreg(com, com_cfcr, CFCR_8BITS); /* dummy to avoid bus echo */
|
|
failures[7] = sio_getreg(com, com_ier);
|
|
DELAY(1000); /* XXX */
|
|
irqmap[3] = isa_irq_pending();
|
|
failures[9] = (sio_getreg(com, com_iir) & IIR_IMASK) - IIR_NOPEND;
|
|
|
|
mtx_unlock_spin(&sio_lock);
|
|
|
|
irqs = irqmap[1] & ~irqmap[0];
|
|
if (bus_get_resource(idev, SYS_RES_IRQ, 0, &xirq, NULL) == 0 &&
|
|
((1 << xirq) & irqs) == 0) {
|
|
printf(
|
|
"sio%d: configured irq %ld not in bitmap of probed irqs %#x\n",
|
|
device_get_unit(dev), xirq, irqs);
|
|
printf(
|
|
"sio%d: port may not be enabled\n",
|
|
device_get_unit(dev));
|
|
}
|
|
if (bootverbose)
|
|
printf("sio%d: irq maps: %#x %#x %#x %#x\n",
|
|
device_get_unit(dev),
|
|
irqmap[0], irqmap[1], irqmap[2], irqmap[3]);
|
|
|
|
result = 0;
|
|
for (fn = 0; fn < sizeof failures; ++fn)
|
|
if (failures[fn]) {
|
|
sio_setreg(com, com_mcr, 0);
|
|
result = ENXIO;
|
|
if (bootverbose) {
|
|
printf("sio%d: probe failed test(s):",
|
|
device_get_unit(dev));
|
|
for (fn = 0; fn < sizeof failures; ++fn)
|
|
if (failures[fn])
|
|
printf(" %d", fn);
|
|
printf("\n");
|
|
}
|
|
break;
|
|
}
|
|
bus_release_resource(dev, SYS_RES_IOPORT, rid, port);
|
|
if (iobase == siocniobase)
|
|
result = 0;
|
|
/*
|
|
* XXX: Since we don't return 0, we shouldn't be relying on the softc
|
|
* that we set to persist to the call to attach since other probe
|
|
* routines may be called, and the malloc here causes subr_bus to not
|
|
* allocate anything for the other probes. Instead, this softc is
|
|
* preserved and other probe routines can corrupt it.
|
|
*/
|
|
if (result != 0) {
|
|
device_set_softc(dev, NULL);
|
|
free(com, M_DEVBUF);
|
|
}
|
|
return (result == 0 ? BUS_PROBE_DEFAULT + 1 : result);
|
|
}
|
|
|
|
#ifdef COM_ESP
|
|
static int
|
|
espattach(com, esp_port)
|
|
struct com_s *com;
|
|
Port_t esp_port;
|
|
{
|
|
u_char dips;
|
|
u_char val;
|
|
|
|
/*
|
|
* Check the ESP-specific I/O port to see if we're an ESP
|
|
* card. If not, return failure immediately.
|
|
*/
|
|
if ((inb(esp_port) & 0xf3) == 0) {
|
|
printf(" port 0x%x is not an ESP board?\n", esp_port);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* We've got something that claims to be a Hayes ESP card.
|
|
* Let's hope so.
|
|
*/
|
|
|
|
/* Get the dip-switch configuration */
|
|
outb(esp_port + ESP_CMD1, ESP_GETDIPS);
|
|
dips = inb(esp_port + ESP_STATUS1);
|
|
|
|
/*
|
|
* Bits 0,1 of dips say which COM port we are.
|
|
*/
|
|
if (rman_get_start(com->ioportres) == likely_com_ports[dips & 0x03])
|
|
printf(" : ESP");
|
|
else {
|
|
printf(" esp_port has com %d\n", dips & 0x03);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Check for ESP version 2.0 or later: bits 4,5,6 = 010.
|
|
*/
|
|
outb(esp_port + ESP_CMD1, ESP_GETTEST);
|
|
val = inb(esp_port + ESP_STATUS1); /* clear reg 1 */
|
|
val = inb(esp_port + ESP_STATUS2);
|
|
if ((val & 0x70) < 0x20) {
|
|
printf("-old (%o)", val & 0x70);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Check for ability to emulate 16550: bit 7 == 1
|
|
*/
|
|
if ((dips & 0x80) == 0) {
|
|
printf(" slave");
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Okay, we seem to be a Hayes ESP card. Whee.
|
|
*/
|
|
com->esp = TRUE;
|
|
com->esp_port = esp_port;
|
|
return (1);
|
|
}
|
|
#endif /* COM_ESP */
|
|
|
|
int
|
|
sioattach(dev, xrid, rclk)
|
|
device_t dev;
|
|
int xrid;
|
|
u_long rclk;
|
|
{
|
|
struct com_s *com;
|
|
#ifdef COM_ESP
|
|
Port_t *espp;
|
|
#endif
|
|
Port_t iobase;
|
|
int unit;
|
|
u_int flags;
|
|
int rid;
|
|
struct resource *port;
|
|
int ret;
|
|
int error;
|
|
struct tty *tp;
|
|
|
|
rid = xrid;
|
|
port = bus_alloc_resource_anywhere(dev, SYS_RES_IOPORT, &rid,
|
|
IO_COMSIZE, RF_ACTIVE);
|
|
if (!port)
|
|
return (ENXIO);
|
|
|
|
iobase = rman_get_start(port);
|
|
unit = device_get_unit(dev);
|
|
com = device_get_softc(dev);
|
|
flags = device_get_flags(dev);
|
|
|
|
if (unit >= sio_numunits)
|
|
sio_numunits = unit + 1;
|
|
/*
|
|
* sioprobe() has initialized the device registers as follows:
|
|
* o cfcr = CFCR_8BITS.
|
|
* It is most important that CFCR_DLAB is off, so that the
|
|
* data port is not hidden when we enable interrupts.
|
|
* o ier = 0.
|
|
* Interrupts are only enabled when the line is open.
|
|
* o mcr = MCR_IENABLE, or 0 if the port has AST/4 compatible
|
|
* interrupt control register or the config specifies no irq.
|
|
* Keeping MCR_DTR and MCR_RTS off might stop the external
|
|
* device from sending before we are ready.
|
|
*/
|
|
bzero(com, sizeof *com);
|
|
com->unit = unit;
|
|
com->ioportres = port;
|
|
com->ioportrid = rid;
|
|
com->bst = rman_get_bustag(port);
|
|
com->bsh = rman_get_bushandle(port);
|
|
com->cfcr_image = CFCR_8BITS;
|
|
com->loses_outints = COM_LOSESOUTINTS(flags) != 0;
|
|
com->no_irq = bus_get_resource(dev, SYS_RES_IRQ, 0, NULL, NULL) != 0;
|
|
com->tx_fifo_size = 1;
|
|
com->obufs[0].l_head = com->obuf1;
|
|
com->obufs[1].l_head = com->obuf2;
|
|
|
|
com->data_port = iobase + com_data;
|
|
com->int_ctl_port = iobase + com_ier;
|
|
com->int_id_port = iobase + com_iir;
|
|
com->modem_ctl_port = iobase + com_mcr;
|
|
com->mcr_image = inb(com->modem_ctl_port);
|
|
com->line_status_port = iobase + com_lsr;
|
|
com->modem_status_port = iobase + com_msr;
|
|
|
|
tp = com->tp = ttyalloc();
|
|
tp->t_oproc = comstart;
|
|
tp->t_param = comparam;
|
|
tp->t_stop = comstop;
|
|
tp->t_modem = commodem;
|
|
tp->t_break = combreak;
|
|
tp->t_close = comclose;
|
|
tp->t_open = comopen;
|
|
tp->t_sc = com;
|
|
|
|
if (rclk == 0)
|
|
rclk = DEFAULT_RCLK;
|
|
com->rclk = rclk;
|
|
|
|
if (unit == comconsole)
|
|
ttyconsolemode(tp, comdefaultrate);
|
|
error = siosetwater(com, tp->t_init_in.c_ispeed);
|
|
mtx_unlock_spin(&sio_lock);
|
|
if (error) {
|
|
/*
|
|
* Leave i/o resources allocated if this is a `cn'-level
|
|
* console, so that other devices can't snarf them.
|
|
*/
|
|
if (iobase != siocniobase)
|
|
bus_release_resource(dev, SYS_RES_IOPORT, rid, port);
|
|
return (ENOMEM);
|
|
}
|
|
|
|
/* attempt to determine UART type */
|
|
printf("sio%d: type", unit);
|
|
|
|
if (!COM_ISMULTIPORT(flags) &&
|
|
!COM_IIR_TXRDYBUG(flags) && !COM_NOSCR(flags)) {
|
|
u_char scr;
|
|
u_char scr1;
|
|
u_char scr2;
|
|
|
|
scr = sio_getreg(com, com_scr);
|
|
sio_setreg(com, com_scr, 0xa5);
|
|
scr1 = sio_getreg(com, com_scr);
|
|
sio_setreg(com, com_scr, 0x5a);
|
|
scr2 = sio_getreg(com, com_scr);
|
|
sio_setreg(com, com_scr, scr);
|
|
if (scr1 != 0xa5 || scr2 != 0x5a) {
|
|
printf(" 8250 or not responding");
|
|
goto determined_type;
|
|
}
|
|
}
|
|
sio_setreg(com, com_fifo, FIFO_ENABLE | FIFO_RX_HIGH);
|
|
DELAY(100);
|
|
switch (inb(com->int_id_port) & IIR_FIFO_MASK) {
|
|
case FIFO_RX_LOW:
|
|
printf(" 16450");
|
|
break;
|
|
case FIFO_RX_MEDL:
|
|
printf(" 16450?");
|
|
break;
|
|
case FIFO_RX_MEDH:
|
|
printf(" 16550?");
|
|
break;
|
|
case FIFO_RX_HIGH:
|
|
if (COM_NOFIFO(flags)) {
|
|
printf(" 16550A fifo disabled");
|
|
break;
|
|
}
|
|
com->hasfifo = TRUE;
|
|
if (COM_ST16650A(flags)) {
|
|
printf(" ST16650A");
|
|
com->st16650a = TRUE;
|
|
com->tx_fifo_size = 32;
|
|
break;
|
|
}
|
|
if (COM_TI16754(flags)) {
|
|
printf(" TI16754");
|
|
com->tx_fifo_size = 64;
|
|
break;
|
|
}
|
|
printf(" 16550A");
|
|
#ifdef COM_ESP
|
|
for (espp = likely_esp_ports; *espp != 0; espp++)
|
|
if (espattach(com, *espp)) {
|
|
com->tx_fifo_size = 1024;
|
|
break;
|
|
}
|
|
if (com->esp)
|
|
break;
|
|
#endif
|
|
com->tx_fifo_size = COM_FIFOSIZE(flags);
|
|
if (com->tx_fifo_size == 0)
|
|
com->tx_fifo_size = 16;
|
|
else
|
|
printf(" lookalike with %u bytes FIFO",
|
|
com->tx_fifo_size);
|
|
break;
|
|
}
|
|
#ifdef COM_ESP
|
|
if (com->esp) {
|
|
/*
|
|
* Set 16550 compatibility mode.
|
|
* We don't use the ESP_MODE_SCALE bit to increase the
|
|
* fifo trigger levels because we can't handle large
|
|
* bursts of input.
|
|
* XXX flow control should be set in comparam(), not here.
|
|
*/
|
|
outb(com->esp_port + ESP_CMD1, ESP_SETMODE);
|
|
outb(com->esp_port + ESP_CMD2, ESP_MODE_RTS | ESP_MODE_FIFO);
|
|
|
|
/* Set RTS/CTS flow control. */
|
|
outb(com->esp_port + ESP_CMD1, ESP_SETFLOWTYPE);
|
|
outb(com->esp_port + ESP_CMD2, ESP_FLOW_RTS);
|
|
outb(com->esp_port + ESP_CMD2, ESP_FLOW_CTS);
|
|
|
|
/* Set flow-control levels. */
|
|
outb(com->esp_port + ESP_CMD1, ESP_SETRXFLOW);
|
|
outb(com->esp_port + ESP_CMD2, HIBYTE(768));
|
|
outb(com->esp_port + ESP_CMD2, LOBYTE(768));
|
|
outb(com->esp_port + ESP_CMD2, HIBYTE(512));
|
|
outb(com->esp_port + ESP_CMD2, LOBYTE(512));
|
|
}
|
|
#endif /* COM_ESP */
|
|
sio_setreg(com, com_fifo, 0);
|
|
determined_type: ;
|
|
|
|
#ifdef COM_MULTIPORT
|
|
if (COM_ISMULTIPORT(flags)) {
|
|
device_t masterdev;
|
|
|
|
com->multiport = TRUE;
|
|
printf(" (multiport");
|
|
if (unit == COM_MPMASTER(flags))
|
|
printf(" master");
|
|
printf(")");
|
|
masterdev = devclass_get_device(sio_devclass,
|
|
COM_MPMASTER(flags));
|
|
com->no_irq = (masterdev == NULL || bus_get_resource(masterdev,
|
|
SYS_RES_IRQ, 0, NULL, NULL) != 0);
|
|
}
|
|
#endif /* COM_MULTIPORT */
|
|
if (unit == comconsole)
|
|
printf(", console");
|
|
if (COM_IIR_TXRDYBUG(flags))
|
|
printf(" with a buggy IIR_TXRDY implementation");
|
|
printf("\n");
|
|
|
|
if (sio_fast_ih == NULL) {
|
|
swi_add(&tty_intr_event, "sio", siopoll, NULL, SWI_TTY, 0,
|
|
&sio_fast_ih);
|
|
swi_add(&clk_intr_event, "sio", siopoll, NULL, SWI_CLOCK, 0,
|
|
&sio_slow_ih);
|
|
}
|
|
|
|
com->flags = flags;
|
|
com->pps.ppscap = PPS_CAPTUREASSERT | PPS_CAPTURECLEAR;
|
|
tp->t_pps = &com->pps;
|
|
|
|
if (COM_PPSCTS(flags))
|
|
com->pps_bit = MSR_CTS;
|
|
else
|
|
com->pps_bit = MSR_DCD;
|
|
pps_init(&com->pps);
|
|
|
|
rid = 0;
|
|
com->irqres = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, RF_ACTIVE);
|
|
if (com->irqres) {
|
|
ret = bus_setup_intr(dev, com->irqres,
|
|
INTR_TYPE_TTY,
|
|
siointr, NULL, com,
|
|
&com->cookie);
|
|
if (ret) {
|
|
ret = bus_setup_intr(dev,
|
|
com->irqres, INTR_TYPE_TTY,
|
|
NULL, (driver_intr_t *)siointr, com, &com->cookie);
|
|
if (ret == 0)
|
|
device_printf(dev, "unable to activate interrupt in fast mode - using normal mode\n");
|
|
}
|
|
if (ret)
|
|
device_printf(dev, "could not activate interrupt\n");
|
|
#if defined(KDB)
|
|
/*
|
|
* Enable interrupts for early break-to-debugger support
|
|
* on the console.
|
|
*/
|
|
if (ret == 0 && unit == comconsole)
|
|
outb(siocniobase + com_ier, IER_ERXRDY | IER_ERLS |
|
|
IER_EMSC);
|
|
#endif
|
|
}
|
|
|
|
/* We're ready, open the doors... */
|
|
ttycreate(tp, TS_CALLOUT, "d%r", unit);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
comopen(struct tty *tp, struct cdev *dev)
|
|
{
|
|
struct com_s *com;
|
|
int i;
|
|
|
|
com = tp->t_sc;
|
|
com->poll = com->no_irq;
|
|
com->poll_output = com->loses_outints;
|
|
if (com->hasfifo) {
|
|
/*
|
|
* (Re)enable and drain fifos.
|
|
*
|
|
* Certain SMC chips cause problems if the fifos
|
|
* are enabled while input is ready. Turn off the
|
|
* fifo if necessary to clear the input. We test
|
|
* the input ready bit after enabling the fifos
|
|
* since we've already enabled them in comparam()
|
|
* and to handle races between enabling and fresh
|
|
* input.
|
|
*/
|
|
for (i = 0; i < 500; i++) {
|
|
sio_setreg(com, com_fifo,
|
|
FIFO_RCV_RST | FIFO_XMT_RST
|
|
| com->fifo_image);
|
|
/*
|
|
* XXX the delays are for superstitious
|
|
* historical reasons. It must be less than
|
|
* the character time at the maximum
|
|
* supported speed (87 usec at 115200 bps
|
|
* 8N1). Otherwise we might loop endlessly
|
|
* if data is streaming in. We used to use
|
|
* delays of 100. That usually worked
|
|
* because DELAY(100) used to usually delay
|
|
* for about 85 usec instead of 100.
|
|
*/
|
|
DELAY(50);
|
|
if (!(inb(com->line_status_port) & LSR_RXRDY))
|
|
break;
|
|
sio_setreg(com, com_fifo, 0);
|
|
DELAY(50);
|
|
(void) inb(com->data_port);
|
|
}
|
|
if (i == 500)
|
|
return (EIO);
|
|
}
|
|
|
|
mtx_lock_spin(&sio_lock);
|
|
(void) inb(com->line_status_port);
|
|
(void) inb(com->data_port);
|
|
com->prev_modem_status = com->last_modem_status
|
|
= inb(com->modem_status_port);
|
|
outb(com->int_ctl_port,
|
|
IER_ERXRDY | IER_ERLS | IER_EMSC
|
|
| (COM_IIR_TXRDYBUG(com->flags) ? 0 : IER_ETXRDY));
|
|
mtx_unlock_spin(&sio_lock);
|
|
siosettimeout();
|
|
/* XXX: should be generic ? */
|
|
if (com->prev_modem_status & MSR_DCD || ISCALLOUT(dev))
|
|
ttyld_modem(tp, 1);
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
comclose(tp)
|
|
struct tty *tp;
|
|
{
|
|
int s;
|
|
struct com_s *com;
|
|
|
|
s = spltty();
|
|
com = tp->t_sc;
|
|
com->poll = FALSE;
|
|
com->poll_output = FALSE;
|
|
sio_setreg(com, com_cfcr, com->cfcr_image &= ~CFCR_SBREAK);
|
|
|
|
#if defined(KDB)
|
|
/*
|
|
* Leave interrupts enabled and don't clear DTR if this is the
|
|
* console. This allows us to detect break-to-debugger events
|
|
* while the console device is closed.
|
|
*/
|
|
if (com->unit != comconsole)
|
|
#endif
|
|
{
|
|
sio_setreg(com, com_ier, 0);
|
|
if (tp->t_cflag & HUPCL
|
|
/*
|
|
* XXX we will miss any carrier drop between here and the
|
|
* next open. Perhaps we should watch DCD even when the
|
|
* port is closed; it is not sufficient to check it at
|
|
* the next open because it might go up and down while
|
|
* we're not watching.
|
|
*/
|
|
|| (!tp->t_actout
|
|
&& !(com->prev_modem_status & MSR_DCD)
|
|
&& !(tp->t_init_in.c_cflag & CLOCAL))
|
|
|| !(tp->t_state & TS_ISOPEN)) {
|
|
(void)commodem(tp, 0, SER_DTR);
|
|
ttydtrwaitstart(tp);
|
|
}
|
|
}
|
|
if (com->hasfifo) {
|
|
/*
|
|
* Disable fifos so that they are off after controlled
|
|
* reboots. Some BIOSes fail to detect 16550s when the
|
|
* fifos are enabled.
|
|
*/
|
|
sio_setreg(com, com_fifo, 0);
|
|
}
|
|
tp->t_actout = FALSE;
|
|
wakeup(&tp->t_actout);
|
|
wakeup(TSA_CARR_ON(tp)); /* restart any wopeners */
|
|
siosettimeout();
|
|
splx(s);
|
|
}
|
|
|
|
static void
|
|
siobusycheck(chan)
|
|
void *chan;
|
|
{
|
|
struct com_s *com;
|
|
int s;
|
|
|
|
com = (struct com_s *)chan;
|
|
|
|
/*
|
|
* Clear TS_BUSY if low-level output is complete.
|
|
* spl locking is sufficient because siointr1() does not set CS_BUSY.
|
|
* If siointr1() clears CS_BUSY after we look at it, then we'll get
|
|
* called again. Reading the line status port outside of siointr1()
|
|
* is safe because CS_BUSY is clear so there are no output interrupts
|
|
* to lose.
|
|
*/
|
|
s = spltty();
|
|
if (com->state & CS_BUSY)
|
|
com->extra_state &= ~CSE_BUSYCHECK; /* False alarm. */
|
|
else if ((inb(com->line_status_port) & (LSR_TSRE | LSR_TXRDY))
|
|
== (LSR_TSRE | LSR_TXRDY)) {
|
|
com->tp->t_state &= ~TS_BUSY;
|
|
ttwwakeup(com->tp);
|
|
com->extra_state &= ~CSE_BUSYCHECK;
|
|
} else
|
|
timeout(siobusycheck, com, hz / 100);
|
|
splx(s);
|
|
}
|
|
|
|
static u_int
|
|
siodivisor(rclk, speed)
|
|
u_long rclk;
|
|
speed_t speed;
|
|
{
|
|
long actual_speed;
|
|
u_int divisor;
|
|
int error;
|
|
|
|
if (speed == 0)
|
|
return (0);
|
|
#if UINT_MAX > (ULONG_MAX - 1) / 8
|
|
if (speed > (ULONG_MAX - 1) / 8)
|
|
return (0);
|
|
#endif
|
|
divisor = (rclk / (8UL * speed) + 1) / 2;
|
|
if (divisor == 0 || divisor >= 65536)
|
|
return (0);
|
|
actual_speed = rclk / (16UL * divisor);
|
|
|
|
/* 10 times error in percent: */
|
|
error = ((actual_speed - (long)speed) * 2000 / (long)speed + 1) / 2;
|
|
|
|
/* 3.0% maximum error tolerance: */
|
|
if (error < -30 || error > 30)
|
|
return (0);
|
|
|
|
return (divisor);
|
|
}
|
|
|
|
/*
|
|
* Call this function with the sio_lock mutex held. It will return with the
|
|
* lock still held.
|
|
*/
|
|
static void
|
|
sioinput(com)
|
|
struct com_s *com;
|
|
{
|
|
u_char *buf;
|
|
int incc;
|
|
u_char line_status;
|
|
int recv_data;
|
|
struct tty *tp;
|
|
|
|
buf = com->ibuf;
|
|
tp = com->tp;
|
|
if (!(tp->t_state & TS_ISOPEN) || !(tp->t_cflag & CREAD)) {
|
|
com_events -= (com->iptr - com->ibuf);
|
|
com->iptr = com->ibuf;
|
|
return;
|
|
}
|
|
if (tp->t_state & TS_CAN_BYPASS_L_RINT) {
|
|
/*
|
|
* Avoid the grotesquely inefficient lineswitch routine
|
|
* (ttyinput) in "raw" mode. It usually takes about 450
|
|
* instructions (that's without canonical processing or echo!).
|
|
* slinput is reasonably fast (usually 40 instructions plus
|
|
* call overhead).
|
|
*/
|
|
do {
|
|
/*
|
|
* This may look odd, but it is using save-and-enable
|
|
* semantics instead of the save-and-disable semantics
|
|
* that are used everywhere else.
|
|
*/
|
|
mtx_unlock_spin(&sio_lock);
|
|
incc = com->iptr - buf;
|
|
if (tp->t_rawq.c_cc + incc > tp->t_ihiwat
|
|
&& (com->state & CS_RTS_IFLOW
|
|
|| tp->t_iflag & IXOFF)
|
|
&& !(tp->t_state & TS_TBLOCK))
|
|
ttyblock(tp);
|
|
com->delta_error_counts[CE_TTY_BUF_OVERFLOW]
|
|
+= b_to_q((char *)buf, incc, &tp->t_rawq);
|
|
buf += incc;
|
|
tk_nin += incc;
|
|
tk_rawcc += incc;
|
|
tp->t_rawcc += incc;
|
|
ttwakeup(tp);
|
|
if (tp->t_state & TS_TTSTOP
|
|
&& (tp->t_iflag & IXANY
|
|
|| tp->t_cc[VSTART] == tp->t_cc[VSTOP])) {
|
|
tp->t_state &= ~TS_TTSTOP;
|
|
tp->t_lflag &= ~FLUSHO;
|
|
comstart(tp);
|
|
}
|
|
mtx_lock_spin(&sio_lock);
|
|
} while (buf < com->iptr);
|
|
} else {
|
|
do {
|
|
/*
|
|
* This may look odd, but it is using save-and-enable
|
|
* semantics instead of the save-and-disable semantics
|
|
* that are used everywhere else.
|
|
*/
|
|
mtx_unlock_spin(&sio_lock);
|
|
line_status = buf[com->ierroff];
|
|
recv_data = *buf++;
|
|
if (line_status
|
|
& (LSR_BI | LSR_FE | LSR_OE | LSR_PE)) {
|
|
if (line_status & LSR_BI)
|
|
recv_data |= TTY_BI;
|
|
if (line_status & LSR_FE)
|
|
recv_data |= TTY_FE;
|
|
if (line_status & LSR_OE)
|
|
recv_data |= TTY_OE;
|
|
if (line_status & LSR_PE)
|
|
recv_data |= TTY_PE;
|
|
}
|
|
ttyld_rint(tp, recv_data);
|
|
mtx_lock_spin(&sio_lock);
|
|
} while (buf < com->iptr);
|
|
}
|
|
com_events -= (com->iptr - com->ibuf);
|
|
com->iptr = com->ibuf;
|
|
|
|
/*
|
|
* There is now room for another low-level buffer full of input,
|
|
* so enable RTS if it is now disabled and there is room in the
|
|
* high-level buffer.
|
|
*/
|
|
if ((com->state & CS_RTS_IFLOW) && !(com->mcr_image & MCR_RTS) &&
|
|
!(tp->t_state & TS_TBLOCK))
|
|
outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS);
|
|
}
|
|
|
|
static int
|
|
siointr(arg)
|
|
void *arg;
|
|
{
|
|
struct com_s *com;
|
|
|
|
#ifndef COM_MULTIPORT
|
|
com = (struct com_s *)arg;
|
|
|
|
mtx_lock_spin(&sio_lock);
|
|
siointr1(com);
|
|
mtx_unlock_spin(&sio_lock);
|
|
#else /* COM_MULTIPORT */
|
|
bool_t possibly_more_intrs;
|
|
int unit;
|
|
|
|
/*
|
|
* Loop until there is no activity on any port. This is necessary
|
|
* to get an interrupt edge more than to avoid another interrupt.
|
|
* If the IRQ signal is just an OR of the IRQ signals from several
|
|
* devices, then the edge from one may be lost because another is
|
|
* on.
|
|
*/
|
|
mtx_lock_spin(&sio_lock);
|
|
do {
|
|
possibly_more_intrs = FALSE;
|
|
for (unit = 0; unit < sio_numunits; ++unit) {
|
|
com = com_addr(unit);
|
|
/*
|
|
* XXX COM_LOCK();
|
|
* would it work here, or be counter-productive?
|
|
*/
|
|
if (com != NULL
|
|
&& !com->gone
|
|
&& (inb(com->int_id_port) & IIR_IMASK)
|
|
!= IIR_NOPEND) {
|
|
siointr1(com);
|
|
possibly_more_intrs = TRUE;
|
|
}
|
|
/* XXX COM_UNLOCK(); */
|
|
}
|
|
} while (possibly_more_intrs);
|
|
mtx_unlock_spin(&sio_lock);
|
|
#endif /* COM_MULTIPORT */
|
|
return(FILTER_HANDLED);
|
|
}
|
|
|
|
static struct timespec siots[8];
|
|
static int siotso;
|
|
static int volatile siotsunit = -1;
|
|
|
|
static int
|
|
sysctl_siots(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
char buf[128];
|
|
long long delta;
|
|
size_t len;
|
|
int error, i, tso;
|
|
|
|
for (i = 1, tso = siotso; i < tso; i++) {
|
|
delta = (long long)(siots[i].tv_sec - siots[i - 1].tv_sec) *
|
|
1000000000 +
|
|
(siots[i].tv_nsec - siots[i - 1].tv_nsec);
|
|
len = sprintf(buf, "%lld\n", delta);
|
|
if (delta >= 110000)
|
|
len += sprintf(buf + len - 1, ": *** %ld.%09ld\n",
|
|
(long)siots[i].tv_sec, siots[i].tv_nsec) - 1;
|
|
if (i == tso - 1)
|
|
buf[len - 1] = '\0';
|
|
error = SYSCTL_OUT(req, buf, len);
|
|
if (error != 0)
|
|
return (error);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
SYSCTL_PROC(_machdep, OID_AUTO, siots, CTLTYPE_STRING | CTLFLAG_RD,
|
|
0, 0, sysctl_siots, "A", "sio timestamps");
|
|
|
|
static void
|
|
siointr1(com)
|
|
struct com_s *com;
|
|
{
|
|
u_char int_ctl;
|
|
u_char int_ctl_new;
|
|
u_char line_status;
|
|
u_char modem_status;
|
|
u_char *ioptr;
|
|
u_char recv_data;
|
|
|
|
#ifdef KDB
|
|
again:
|
|
#endif
|
|
|
|
if (COM_IIR_TXRDYBUG(com->flags)) {
|
|
int_ctl = inb(com->int_ctl_port);
|
|
int_ctl_new = int_ctl;
|
|
} else {
|
|
int_ctl = 0;
|
|
int_ctl_new = 0;
|
|
}
|
|
|
|
while (!com->gone) {
|
|
if (com->pps.ppsparam.mode & PPS_CAPTUREBOTH) {
|
|
modem_status = inb(com->modem_status_port);
|
|
if ((modem_status ^ com->last_modem_status) &
|
|
com->pps_bit) {
|
|
pps_capture(&com->pps);
|
|
pps_event(&com->pps,
|
|
(modem_status & com->pps_bit) ?
|
|
PPS_CAPTUREASSERT : PPS_CAPTURECLEAR);
|
|
}
|
|
}
|
|
line_status = inb(com->line_status_port);
|
|
|
|
/* input event? (check first to help avoid overruns) */
|
|
while (line_status & LSR_RCV_MASK) {
|
|
/* break/unnattached error bits or real input? */
|
|
if (!(line_status & LSR_RXRDY))
|
|
recv_data = 0;
|
|
else
|
|
recv_data = inb(com->data_port);
|
|
#ifdef KDB
|
|
if (com->unit == comconsole &&
|
|
kdb_alt_break(recv_data, &com->alt_brk_state) != 0)
|
|
goto again;
|
|
#endif /* KDB */
|
|
if (line_status & (LSR_BI | LSR_FE | LSR_PE)) {
|
|
/*
|
|
* Don't store BI if IGNBRK or FE/PE if IGNPAR.
|
|
* Otherwise, push the work to a higher level
|
|
* (to handle PARMRK) if we're bypassing.
|
|
* Otherwise, convert BI/FE and PE+INPCK to 0.
|
|
*
|
|
* This makes bypassing work right in the
|
|
* usual "raw" case (IGNBRK set, and IGNPAR
|
|
* and INPCK clear).
|
|
*
|
|
* Note: BI together with FE/PE means just BI.
|
|
*/
|
|
if (line_status & LSR_BI) {
|
|
#if defined(KDB)
|
|
if (com->unit == comconsole) {
|
|
kdb_break();
|
|
goto cont;
|
|
}
|
|
#endif
|
|
if (com->tp == NULL
|
|
|| com->tp->t_iflag & IGNBRK)
|
|
goto cont;
|
|
} else {
|
|
if (com->tp == NULL
|
|
|| com->tp->t_iflag & IGNPAR)
|
|
goto cont;
|
|
}
|
|
if (com->tp->t_state & TS_CAN_BYPASS_L_RINT
|
|
&& (line_status & (LSR_BI | LSR_FE)
|
|
|| com->tp->t_iflag & INPCK))
|
|
recv_data = 0;
|
|
}
|
|
++com->bytes_in;
|
|
if (com->tp != NULL &&
|
|
com->tp->t_hotchar != 0 && recv_data == com->tp->t_hotchar)
|
|
swi_sched(sio_fast_ih, 0);
|
|
ioptr = com->iptr;
|
|
if (ioptr >= com->ibufend)
|
|
CE_RECORD(com, CE_INTERRUPT_BUF_OVERFLOW);
|
|
else {
|
|
if (com->tp != NULL && com->tp->t_do_timestamp)
|
|
microtime(&com->tp->t_timestamp);
|
|
++com_events;
|
|
swi_sched(sio_slow_ih, SWI_DELAY);
|
|
#if 0 /* for testing input latency vs efficiency */
|
|
if (com->iptr - com->ibuf == 8)
|
|
swi_sched(sio_fast_ih, 0);
|
|
#endif
|
|
ioptr[0] = recv_data;
|
|
ioptr[com->ierroff] = line_status;
|
|
com->iptr = ++ioptr;
|
|
if (ioptr == com->ihighwater
|
|
&& com->state & CS_RTS_IFLOW)
|
|
outb(com->modem_ctl_port,
|
|
com->mcr_image &= ~MCR_RTS);
|
|
if (line_status & LSR_OE)
|
|
CE_RECORD(com, CE_OVERRUN);
|
|
}
|
|
cont:
|
|
if (line_status & LSR_TXRDY
|
|
&& com->state >= (CS_BUSY | CS_TTGO | CS_ODEVREADY))
|
|
goto txrdy;
|
|
|
|
/*
|
|
* "& 0x7F" is to avoid the gcc-1.40 generating a slow
|
|
* jump from the top of the loop to here
|
|
*/
|
|
line_status = inb(com->line_status_port) & 0x7F;
|
|
}
|
|
|
|
/* modem status change? (always check before doing output) */
|
|
modem_status = inb(com->modem_status_port);
|
|
if (modem_status != com->last_modem_status) {
|
|
/*
|
|
* Schedule high level to handle DCD changes. Note
|
|
* that we don't use the delta bits anywhere. Some
|
|
* UARTs mess them up, and it's easy to remember the
|
|
* previous bits and calculate the delta.
|
|
*/
|
|
com->last_modem_status = modem_status;
|
|
if (!(com->state & CS_CHECKMSR)) {
|
|
com_events += LOTS_OF_EVENTS;
|
|
com->state |= CS_CHECKMSR;
|
|
swi_sched(sio_fast_ih, 0);
|
|
}
|
|
|
|
/* handle CTS change immediately for crisp flow ctl */
|
|
if (com->state & CS_CTS_OFLOW) {
|
|
if (modem_status & MSR_CTS)
|
|
com->state |= CS_ODEVREADY;
|
|
else
|
|
com->state &= ~CS_ODEVREADY;
|
|
}
|
|
}
|
|
|
|
txrdy:
|
|
/* output queued and everything ready? */
|
|
if (line_status & LSR_TXRDY
|
|
&& com->state >= (CS_BUSY | CS_TTGO | CS_ODEVREADY)) {
|
|
ioptr = com->obufq.l_head;
|
|
if (com->tx_fifo_size > 1 && com->unit != siotsunit) {
|
|
u_int ocount;
|
|
|
|
ocount = com->obufq.l_tail - ioptr;
|
|
if (ocount > com->tx_fifo_size)
|
|
ocount = com->tx_fifo_size;
|
|
com->bytes_out += ocount;
|
|
do
|
|
outb(com->data_port, *ioptr++);
|
|
while (--ocount != 0);
|
|
} else {
|
|
outb(com->data_port, *ioptr++);
|
|
++com->bytes_out;
|
|
if (com->unit == siotsunit
|
|
&& siotso < nitems(siots))
|
|
nanouptime(&siots[siotso++]);
|
|
}
|
|
com->obufq.l_head = ioptr;
|
|
if (COM_IIR_TXRDYBUG(com->flags))
|
|
int_ctl_new = int_ctl | IER_ETXRDY;
|
|
if (ioptr >= com->obufq.l_tail) {
|
|
struct lbq *qp;
|
|
|
|
qp = com->obufq.l_next;
|
|
qp->l_queued = FALSE;
|
|
qp = qp->l_next;
|
|
if (qp != NULL) {
|
|
com->obufq.l_head = qp->l_head;
|
|
com->obufq.l_tail = qp->l_tail;
|
|
com->obufq.l_next = qp;
|
|
} else {
|
|
/* output just completed */
|
|
if (COM_IIR_TXRDYBUG(com->flags))
|
|
int_ctl_new = int_ctl
|
|
& ~IER_ETXRDY;
|
|
com->state &= ~CS_BUSY;
|
|
}
|
|
if (!(com->state & CS_ODONE)) {
|
|
com_events += LOTS_OF_EVENTS;
|
|
com->state |= CS_ODONE;
|
|
/* handle at high level ASAP */
|
|
swi_sched(sio_fast_ih, 0);
|
|
}
|
|
}
|
|
if (COM_IIR_TXRDYBUG(com->flags)
|
|
&& int_ctl != int_ctl_new)
|
|
outb(com->int_ctl_port, int_ctl_new);
|
|
}
|
|
|
|
/* finished? */
|
|
#ifndef COM_MULTIPORT
|
|
if ((inb(com->int_id_port) & IIR_IMASK) == IIR_NOPEND)
|
|
#endif /* COM_MULTIPORT */
|
|
return;
|
|
}
|
|
}
|
|
|
|
/* software interrupt handler for SWI_TTY */
|
|
static void
|
|
siopoll(void *dummy)
|
|
{
|
|
int unit;
|
|
|
|
if (com_events == 0)
|
|
return;
|
|
repeat:
|
|
for (unit = 0; unit < sio_numunits; ++unit) {
|
|
struct com_s *com;
|
|
int incc;
|
|
struct tty *tp;
|
|
|
|
com = com_addr(unit);
|
|
if (com == NULL)
|
|
continue;
|
|
tp = com->tp;
|
|
if (tp == NULL || com->gone) {
|
|
/*
|
|
* Discard any events related to never-opened or
|
|
* going-away devices.
|
|
*/
|
|
mtx_lock_spin(&sio_lock);
|
|
incc = com->iptr - com->ibuf;
|
|
com->iptr = com->ibuf;
|
|
if (com->state & CS_CHECKMSR) {
|
|
incc += LOTS_OF_EVENTS;
|
|
com->state &= ~CS_CHECKMSR;
|
|
}
|
|
com_events -= incc;
|
|
mtx_unlock_spin(&sio_lock);
|
|
continue;
|
|
}
|
|
if (com->iptr != com->ibuf) {
|
|
mtx_lock_spin(&sio_lock);
|
|
sioinput(com);
|
|
mtx_unlock_spin(&sio_lock);
|
|
}
|
|
if (com->state & CS_CHECKMSR) {
|
|
u_char delta_modem_status;
|
|
|
|
mtx_lock_spin(&sio_lock);
|
|
delta_modem_status = com->last_modem_status
|
|
^ com->prev_modem_status;
|
|
com->prev_modem_status = com->last_modem_status;
|
|
com_events -= LOTS_OF_EVENTS;
|
|
com->state &= ~CS_CHECKMSR;
|
|
mtx_unlock_spin(&sio_lock);
|
|
if (delta_modem_status & MSR_DCD)
|
|
ttyld_modem(tp,
|
|
com->prev_modem_status & MSR_DCD);
|
|
}
|
|
if (com->state & CS_ODONE) {
|
|
mtx_lock_spin(&sio_lock);
|
|
com_events -= LOTS_OF_EVENTS;
|
|
com->state &= ~CS_ODONE;
|
|
mtx_unlock_spin(&sio_lock);
|
|
if (!(com->state & CS_BUSY)
|
|
&& !(com->extra_state & CSE_BUSYCHECK)) {
|
|
timeout(siobusycheck, com, hz / 100);
|
|
com->extra_state |= CSE_BUSYCHECK;
|
|
}
|
|
ttyld_start(tp);
|
|
}
|
|
if (com_events == 0)
|
|
break;
|
|
}
|
|
if (com_events >= LOTS_OF_EVENTS)
|
|
goto repeat;
|
|
}
|
|
|
|
static void
|
|
combreak(tp, sig)
|
|
struct tty *tp;
|
|
int sig;
|
|
{
|
|
struct com_s *com;
|
|
|
|
com = tp->t_sc;
|
|
|
|
if (sig)
|
|
sio_setreg(com, com_cfcr, com->cfcr_image |= CFCR_SBREAK);
|
|
else
|
|
sio_setreg(com, com_cfcr, com->cfcr_image &= ~CFCR_SBREAK);
|
|
}
|
|
|
|
static int
|
|
comparam(tp, t)
|
|
struct tty *tp;
|
|
struct termios *t;
|
|
{
|
|
u_int cfcr;
|
|
int cflag;
|
|
struct com_s *com;
|
|
u_int divisor;
|
|
u_char dlbh;
|
|
u_char dlbl;
|
|
u_char efr_flowbits;
|
|
int s;
|
|
|
|
com = tp->t_sc;
|
|
if (com == NULL)
|
|
return (ENODEV);
|
|
|
|
/* check requested parameters */
|
|
if (t->c_ispeed != (t->c_ospeed != 0 ? t->c_ospeed : tp->t_ospeed))
|
|
return (EINVAL);
|
|
divisor = siodivisor(com->rclk, t->c_ispeed);
|
|
if (divisor == 0)
|
|
return (EINVAL);
|
|
|
|
/* parameters are OK, convert them to the com struct and the device */
|
|
s = spltty();
|
|
if (t->c_ospeed == 0)
|
|
(void)commodem(tp, 0, SER_DTR); /* hang up line */
|
|
else
|
|
(void)commodem(tp, SER_DTR, 0);
|
|
cflag = t->c_cflag;
|
|
switch (cflag & CSIZE) {
|
|
case CS5:
|
|
cfcr = CFCR_5BITS;
|
|
break;
|
|
case CS6:
|
|
cfcr = CFCR_6BITS;
|
|
break;
|
|
case CS7:
|
|
cfcr = CFCR_7BITS;
|
|
break;
|
|
default:
|
|
cfcr = CFCR_8BITS;
|
|
break;
|
|
}
|
|
if (cflag & PARENB) {
|
|
cfcr |= CFCR_PENAB;
|
|
if (!(cflag & PARODD))
|
|
cfcr |= CFCR_PEVEN;
|
|
}
|
|
if (cflag & CSTOPB)
|
|
cfcr |= CFCR_STOPB;
|
|
|
|
if (com->hasfifo) {
|
|
/*
|
|
* Use a fifo trigger level low enough so that the input
|
|
* latency from the fifo is less than about 16 msec and
|
|
* the total latency is less than about 30 msec. These
|
|
* latencies are reasonable for humans. Serial comms
|
|
* protocols shouldn't expect anything better since modem
|
|
* latencies are larger.
|
|
*
|
|
* The fifo trigger level cannot be set at RX_HIGH for high
|
|
* speed connections without further work on reducing
|
|
* interrupt disablement times in other parts of the system,
|
|
* without producing silo overflow errors.
|
|
*/
|
|
com->fifo_image = com->unit == siotsunit ? 0
|
|
: t->c_ispeed <= 4800
|
|
? FIFO_ENABLE : FIFO_ENABLE | FIFO_RX_MEDH;
|
|
#ifdef COM_ESP
|
|
/*
|
|
* The Hayes ESP card needs the fifo DMA mode bit set
|
|
* in compatibility mode. If not, it will interrupt
|
|
* for each character received.
|
|
*/
|
|
if (com->esp)
|
|
com->fifo_image |= FIFO_DMA_MODE;
|
|
#endif
|
|
sio_setreg(com, com_fifo, com->fifo_image);
|
|
}
|
|
|
|
/*
|
|
* This returns with interrupts disabled so that we can complete
|
|
* the speed change atomically. Keeping interrupts disabled is
|
|
* especially important while com_data is hidden.
|
|
*/
|
|
(void) siosetwater(com, t->c_ispeed);
|
|
|
|
sio_setreg(com, com_cfcr, cfcr | CFCR_DLAB);
|
|
/*
|
|
* Only set the divisor registers if they would change, since on
|
|
* some 16550 incompatibles (UMC8669F), setting them while input
|
|
* is arriving loses sync until data stops arriving.
|
|
*/
|
|
dlbl = divisor & 0xFF;
|
|
if (sio_getreg(com, com_dlbl) != dlbl)
|
|
sio_setreg(com, com_dlbl, dlbl);
|
|
dlbh = divisor >> 8;
|
|
if (sio_getreg(com, com_dlbh) != dlbh)
|
|
sio_setreg(com, com_dlbh, dlbh);
|
|
|
|
efr_flowbits = 0;
|
|
|
|
if (cflag & CRTS_IFLOW) {
|
|
com->state |= CS_RTS_IFLOW;
|
|
efr_flowbits |= EFR_AUTORTS;
|
|
/*
|
|
* If CS_RTS_IFLOW just changed from off to on, the change
|
|
* needs to be propagated to MCR_RTS. This isn't urgent,
|
|
* so do it later by calling comstart() instead of repeating
|
|
* a lot of code from comstart() here.
|
|
*/
|
|
} else if (com->state & CS_RTS_IFLOW) {
|
|
com->state &= ~CS_RTS_IFLOW;
|
|
/*
|
|
* CS_RTS_IFLOW just changed from on to off. Force MCR_RTS
|
|
* on here, since comstart() won't do it later.
|
|
*/
|
|
outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS);
|
|
}
|
|
|
|
/*
|
|
* Set up state to handle output flow control.
|
|
* XXX - worth handling MDMBUF (DCD) flow control at the lowest level?
|
|
* Now has 10+ msec latency, while CTS flow has 50- usec latency.
|
|
*/
|
|
com->state |= CS_ODEVREADY;
|
|
com->state &= ~CS_CTS_OFLOW;
|
|
if (cflag & CCTS_OFLOW) {
|
|
com->state |= CS_CTS_OFLOW;
|
|
efr_flowbits |= EFR_AUTOCTS;
|
|
if (!(com->last_modem_status & MSR_CTS))
|
|
com->state &= ~CS_ODEVREADY;
|
|
}
|
|
|
|
if (com->st16650a) {
|
|
sio_setreg(com, com_lcr, LCR_EFR_ENABLE);
|
|
sio_setreg(com, com_efr,
|
|
(sio_getreg(com, com_efr)
|
|
& ~(EFR_AUTOCTS | EFR_AUTORTS)) | efr_flowbits);
|
|
}
|
|
sio_setreg(com, com_cfcr, com->cfcr_image = cfcr);
|
|
|
|
/* XXX shouldn't call functions while intrs are disabled. */
|
|
ttyldoptim(tp);
|
|
|
|
mtx_unlock_spin(&sio_lock);
|
|
splx(s);
|
|
comstart(tp);
|
|
if (com->ibufold != NULL) {
|
|
free(com->ibufold, M_DEVBUF);
|
|
com->ibufold = NULL;
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* This function must be called with the sio_lock mutex released and will
|
|
* return with it obtained.
|
|
*/
|
|
static int
|
|
siosetwater(com, speed)
|
|
struct com_s *com;
|
|
speed_t speed;
|
|
{
|
|
int cp4ticks;
|
|
u_char *ibuf;
|
|
int ibufsize;
|
|
struct tty *tp;
|
|
|
|
/*
|
|
* Make the buffer size large enough to handle a softtty interrupt
|
|
* latency of about 2 ticks without loss of throughput or data
|
|
* (about 3 ticks if input flow control is not used or not honoured,
|
|
* but a bit less for CS5-CS7 modes).
|
|
*/
|
|
cp4ticks = speed / 10 / hz * 4;
|
|
for (ibufsize = 128; ibufsize < cp4ticks;)
|
|
ibufsize <<= 1;
|
|
if (ibufsize == com->ibufsize) {
|
|
mtx_lock_spin(&sio_lock);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Allocate input buffer. The extra factor of 2 in the size is
|
|
* to allow for an error byte for each input byte.
|
|
*/
|
|
ibuf = malloc(2 * ibufsize, M_DEVBUF, M_NOWAIT);
|
|
if (ibuf == NULL) {
|
|
mtx_lock_spin(&sio_lock);
|
|
return (ENOMEM);
|
|
}
|
|
|
|
/* Initialize non-critical variables. */
|
|
com->ibufold = com->ibuf;
|
|
com->ibufsize = ibufsize;
|
|
tp = com->tp;
|
|
if (tp != NULL) {
|
|
tp->t_ififosize = 2 * ibufsize;
|
|
tp->t_ispeedwat = (speed_t)-1;
|
|
tp->t_ospeedwat = (speed_t)-1;
|
|
}
|
|
|
|
/*
|
|
* Read current input buffer, if any. Continue with interrupts
|
|
* disabled.
|
|
*/
|
|
mtx_lock_spin(&sio_lock);
|
|
if (com->iptr != com->ibuf)
|
|
sioinput(com);
|
|
|
|
/*-
|
|
* Initialize critical variables, including input buffer watermarks.
|
|
* The external device is asked to stop sending when the buffer
|
|
* exactly reaches high water, or when the high level requests it.
|
|
* The high level is notified immediately (rather than at a later
|
|
* clock tick) when this watermark is reached.
|
|
* The buffer size is chosen so the watermark should almost never
|
|
* be reached.
|
|
* The low watermark is invisibly 0 since the buffer is always
|
|
* emptied all at once.
|
|
*/
|
|
com->iptr = com->ibuf = ibuf;
|
|
com->ibufend = ibuf + ibufsize;
|
|
com->ierroff = ibufsize;
|
|
com->ihighwater = ibuf + 3 * ibufsize / 4;
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
comstart(tp)
|
|
struct tty *tp;
|
|
{
|
|
struct com_s *com;
|
|
int s;
|
|
|
|
com = tp->t_sc;
|
|
if (com == NULL)
|
|
return;
|
|
s = spltty();
|
|
mtx_lock_spin(&sio_lock);
|
|
if (tp->t_state & TS_TTSTOP)
|
|
com->state &= ~CS_TTGO;
|
|
else
|
|
com->state |= CS_TTGO;
|
|
if (tp->t_state & TS_TBLOCK) {
|
|
if (com->mcr_image & MCR_RTS && com->state & CS_RTS_IFLOW)
|
|
outb(com->modem_ctl_port, com->mcr_image &= ~MCR_RTS);
|
|
} else {
|
|
if (!(com->mcr_image & MCR_RTS) && com->iptr < com->ihighwater
|
|
&& com->state & CS_RTS_IFLOW)
|
|
outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS);
|
|
}
|
|
mtx_unlock_spin(&sio_lock);
|
|
if (tp->t_state & (TS_TIMEOUT | TS_TTSTOP)) {
|
|
ttwwakeup(tp);
|
|
splx(s);
|
|
return;
|
|
}
|
|
if (tp->t_outq.c_cc != 0) {
|
|
struct lbq *qp;
|
|
struct lbq *next;
|
|
|
|
if (!com->obufs[0].l_queued) {
|
|
com->obufs[0].l_tail
|
|
= com->obuf1 + q_to_b(&tp->t_outq, com->obuf1,
|
|
sizeof com->obuf1);
|
|
com->obufs[0].l_next = NULL;
|
|
com->obufs[0].l_queued = TRUE;
|
|
mtx_lock_spin(&sio_lock);
|
|
if (com->state & CS_BUSY) {
|
|
qp = com->obufq.l_next;
|
|
while ((next = qp->l_next) != NULL)
|
|
qp = next;
|
|
qp->l_next = &com->obufs[0];
|
|
} else {
|
|
com->obufq.l_head = com->obufs[0].l_head;
|
|
com->obufq.l_tail = com->obufs[0].l_tail;
|
|
com->obufq.l_next = &com->obufs[0];
|
|
com->state |= CS_BUSY;
|
|
}
|
|
mtx_unlock_spin(&sio_lock);
|
|
}
|
|
if (tp->t_outq.c_cc != 0 && !com->obufs[1].l_queued) {
|
|
com->obufs[1].l_tail
|
|
= com->obuf2 + q_to_b(&tp->t_outq, com->obuf2,
|
|
sizeof com->obuf2);
|
|
com->obufs[1].l_next = NULL;
|
|
com->obufs[1].l_queued = TRUE;
|
|
mtx_lock_spin(&sio_lock);
|
|
if (com->state & CS_BUSY) {
|
|
qp = com->obufq.l_next;
|
|
while ((next = qp->l_next) != NULL)
|
|
qp = next;
|
|
qp->l_next = &com->obufs[1];
|
|
} else {
|
|
com->obufq.l_head = com->obufs[1].l_head;
|
|
com->obufq.l_tail = com->obufs[1].l_tail;
|
|
com->obufq.l_next = &com->obufs[1];
|
|
com->state |= CS_BUSY;
|
|
}
|
|
mtx_unlock_spin(&sio_lock);
|
|
}
|
|
tp->t_state |= TS_BUSY;
|
|
}
|
|
mtx_lock_spin(&sio_lock);
|
|
if (com->state >= (CS_BUSY | CS_TTGO))
|
|
siointr1(com); /* fake interrupt to start output */
|
|
mtx_unlock_spin(&sio_lock);
|
|
ttwwakeup(tp);
|
|
splx(s);
|
|
}
|
|
|
|
static void
|
|
comstop(tp, rw)
|
|
struct tty *tp;
|
|
int rw;
|
|
{
|
|
struct com_s *com;
|
|
|
|
com = tp->t_sc;
|
|
if (com == NULL || com->gone)
|
|
return;
|
|
mtx_lock_spin(&sio_lock);
|
|
if (rw & FWRITE) {
|
|
if (com->hasfifo)
|
|
#ifdef COM_ESP
|
|
/* XXX avoid h/w bug. */
|
|
if (!com->esp)
|
|
#endif
|
|
sio_setreg(com, com_fifo,
|
|
FIFO_XMT_RST | com->fifo_image);
|
|
com->obufs[0].l_queued = FALSE;
|
|
com->obufs[1].l_queued = FALSE;
|
|
if (com->state & CS_ODONE)
|
|
com_events -= LOTS_OF_EVENTS;
|
|
com->state &= ~(CS_ODONE | CS_BUSY);
|
|
com->tp->t_state &= ~TS_BUSY;
|
|
}
|
|
if (rw & FREAD) {
|
|
if (com->hasfifo)
|
|
#ifdef COM_ESP
|
|
/* XXX avoid h/w bug. */
|
|
if (!com->esp)
|
|
#endif
|
|
sio_setreg(com, com_fifo,
|
|
FIFO_RCV_RST | com->fifo_image);
|
|
com_events -= (com->iptr - com->ibuf);
|
|
com->iptr = com->ibuf;
|
|
}
|
|
mtx_unlock_spin(&sio_lock);
|
|
comstart(tp);
|
|
}
|
|
|
|
static int
|
|
commodem(struct tty *tp, int sigon, int sigoff)
|
|
{
|
|
struct com_s *com;
|
|
int bitand, bitor, msr;
|
|
|
|
com = tp->t_sc;
|
|
if (com->gone)
|
|
return(0);
|
|
if (sigon != 0 || sigoff != 0) {
|
|
bitand = bitor = 0;
|
|
if (sigoff & SER_DTR)
|
|
bitand |= MCR_DTR;
|
|
if (sigoff & SER_RTS)
|
|
bitand |= MCR_RTS;
|
|
if (sigon & SER_DTR)
|
|
bitor |= MCR_DTR;
|
|
if (sigon & SER_RTS)
|
|
bitor |= MCR_RTS;
|
|
bitand = ~bitand;
|
|
mtx_lock_spin(&sio_lock);
|
|
com->mcr_image &= bitand;
|
|
com->mcr_image |= bitor;
|
|
outb(com->modem_ctl_port, com->mcr_image);
|
|
mtx_unlock_spin(&sio_lock);
|
|
return (0);
|
|
} else {
|
|
bitor = 0;
|
|
if (com->mcr_image & MCR_DTR)
|
|
bitor |= SER_DTR;
|
|
if (com->mcr_image & MCR_RTS)
|
|
bitor |= SER_RTS;
|
|
msr = com->prev_modem_status;
|
|
if (msr & MSR_CTS)
|
|
bitor |= SER_CTS;
|
|
if (msr & MSR_DCD)
|
|
bitor |= SER_DCD;
|
|
if (msr & MSR_DSR)
|
|
bitor |= SER_DSR;
|
|
if (msr & MSR_DSR)
|
|
bitor |= SER_DSR;
|
|
if (msr & (MSR_RI | MSR_TERI))
|
|
bitor |= SER_RI;
|
|
return (bitor);
|
|
}
|
|
}
|
|
|
|
static void
|
|
siosettimeout()
|
|
{
|
|
struct com_s *com;
|
|
bool_t someopen;
|
|
int unit;
|
|
|
|
/*
|
|
* Set our timeout period to 1 second if no polled devices are open.
|
|
* Otherwise set it to max(1/200, 1/hz).
|
|
* Enable timeouts iff some device is open.
|
|
*/
|
|
untimeout(comwakeup, (void *)NULL, sio_timeout_handle);
|
|
sio_timeout = hz;
|
|
someopen = FALSE;
|
|
for (unit = 0; unit < sio_numunits; ++unit) {
|
|
com = com_addr(unit);
|
|
if (com != NULL && com->tp != NULL
|
|
&& com->tp->t_state & TS_ISOPEN && !com->gone) {
|
|
someopen = TRUE;
|
|
if (com->poll || com->poll_output) {
|
|
sio_timeout = hz > 200 ? hz / 200 : 1;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
if (someopen) {
|
|
sio_timeouts_until_log = hz / sio_timeout;
|
|
sio_timeout_handle = timeout(comwakeup, (void *)NULL,
|
|
sio_timeout);
|
|
} else {
|
|
/* Flush error messages, if any. */
|
|
sio_timeouts_until_log = 1;
|
|
comwakeup((void *)NULL);
|
|
untimeout(comwakeup, (void *)NULL, sio_timeout_handle);
|
|
}
|
|
}
|
|
|
|
static void
|
|
comwakeup(chan)
|
|
void *chan;
|
|
{
|
|
struct com_s *com;
|
|
int unit;
|
|
|
|
sio_timeout_handle = timeout(comwakeup, (void *)NULL, sio_timeout);
|
|
|
|
/*
|
|
* Recover from lost output interrupts.
|
|
* Poll any lines that don't use interrupts.
|
|
*/
|
|
for (unit = 0; unit < sio_numunits; ++unit) {
|
|
com = com_addr(unit);
|
|
if (com != NULL && !com->gone
|
|
&& (com->state >= (CS_BUSY | CS_TTGO) || com->poll)) {
|
|
mtx_lock_spin(&sio_lock);
|
|
siointr1(com);
|
|
mtx_unlock_spin(&sio_lock);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Check for and log errors, but not too often.
|
|
*/
|
|
if (--sio_timeouts_until_log > 0)
|
|
return;
|
|
sio_timeouts_until_log = hz / sio_timeout;
|
|
for (unit = 0; unit < sio_numunits; ++unit) {
|
|
int errnum;
|
|
|
|
com = com_addr(unit);
|
|
if (com == NULL)
|
|
continue;
|
|
if (com->gone)
|
|
continue;
|
|
for (errnum = 0; errnum < CE_NTYPES; ++errnum) {
|
|
u_int delta;
|
|
u_long total;
|
|
|
|
mtx_lock_spin(&sio_lock);
|
|
delta = com->delta_error_counts[errnum];
|
|
com->delta_error_counts[errnum] = 0;
|
|
mtx_unlock_spin(&sio_lock);
|
|
if (delta == 0)
|
|
continue;
|
|
total = com->error_counts[errnum] += delta;
|
|
log(LOG_ERR, "sio%d: %u more %s%s (total %lu)\n",
|
|
unit, delta, error_desc[errnum],
|
|
delta == 1 ? "" : "s", total);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Following are all routines needed for SIO to act as console
|
|
*/
|
|
struct siocnstate {
|
|
u_char dlbl;
|
|
u_char dlbh;
|
|
u_char ier;
|
|
u_char cfcr;
|
|
u_char mcr;
|
|
};
|
|
|
|
/*
|
|
* This is a function in order to not replicate "ttyd%d" more
|
|
* places than absolutely necessary.
|
|
*/
|
|
static void
|
|
siocnset(struct consdev *cd, int unit)
|
|
{
|
|
|
|
cd->cn_unit = unit;
|
|
sprintf(cd->cn_name, "ttyd%d", unit);
|
|
}
|
|
|
|
static speed_t siocngetspeed(Port_t, u_long rclk);
|
|
static void siocnclose(struct siocnstate *sp, Port_t iobase);
|
|
static void siocnopen(struct siocnstate *sp, Port_t iobase, int speed);
|
|
static void siocntxwait(Port_t iobase);
|
|
|
|
static cn_probe_t sio_cnprobe;
|
|
static cn_init_t sio_cninit;
|
|
static cn_term_t sio_cnterm;
|
|
static cn_getc_t sio_cngetc;
|
|
static cn_putc_t sio_cnputc;
|
|
static cn_grab_t sio_cngrab;
|
|
static cn_ungrab_t sio_cnungrab;
|
|
|
|
CONSOLE_DRIVER(sio);
|
|
|
|
static void
|
|
siocntxwait(iobase)
|
|
Port_t iobase;
|
|
{
|
|
int timo;
|
|
|
|
/*
|
|
* Wait for any pending transmission to finish. Required to avoid
|
|
* the UART lockup bug when the speed is changed, and for normal
|
|
* transmits.
|
|
*/
|
|
timo = 100000;
|
|
while ((inb(iobase + com_lsr) & (LSR_TSRE | LSR_TXRDY))
|
|
!= (LSR_TSRE | LSR_TXRDY) && --timo != 0)
|
|
;
|
|
}
|
|
|
|
/*
|
|
* Read the serial port specified and try to figure out what speed
|
|
* it's currently running at. We're assuming the serial port has
|
|
* been initialized and is basically idle. This routine is only intended
|
|
* to be run at system startup.
|
|
*
|
|
* If the value read from the serial port doesn't make sense, return 0.
|
|
*/
|
|
|
|
static speed_t
|
|
siocngetspeed(iobase, rclk)
|
|
Port_t iobase;
|
|
u_long rclk;
|
|
{
|
|
u_int divisor;
|
|
u_char dlbh;
|
|
u_char dlbl;
|
|
u_char cfcr;
|
|
|
|
cfcr = inb(iobase + com_cfcr);
|
|
outb(iobase + com_cfcr, CFCR_DLAB | cfcr);
|
|
|
|
dlbl = inb(iobase + com_dlbl);
|
|
dlbh = inb(iobase + com_dlbh);
|
|
|
|
outb(iobase + com_cfcr, cfcr);
|
|
|
|
divisor = dlbh << 8 | dlbl;
|
|
|
|
/* XXX there should be more sanity checking. */
|
|
if (divisor == 0)
|
|
return (CONSPEED);
|
|
return (rclk / (16UL * divisor));
|
|
}
|
|
|
|
static void
|
|
siocnopen(sp, iobase, speed)
|
|
struct siocnstate *sp;
|
|
Port_t iobase;
|
|
int speed;
|
|
{
|
|
u_int divisor;
|
|
u_char dlbh;
|
|
u_char dlbl;
|
|
|
|
/*
|
|
* Save all the device control registers except the fifo register
|
|
* and set our default ones (cs8 -parenb speed=comdefaultrate).
|
|
* We can't save the fifo register since it is read-only.
|
|
*/
|
|
sp->ier = inb(iobase + com_ier);
|
|
outb(iobase + com_ier, 0); /* spltty() doesn't stop siointr() */
|
|
siocntxwait(iobase);
|
|
sp->cfcr = inb(iobase + com_cfcr);
|
|
outb(iobase + com_cfcr, CFCR_DLAB | CFCR_8BITS);
|
|
sp->dlbl = inb(iobase + com_dlbl);
|
|
sp->dlbh = inb(iobase + com_dlbh);
|
|
/*
|
|
* Only set the divisor registers if they would change, since on
|
|
* some 16550 incompatibles (Startech), setting them clears the
|
|
* data input register. This also reduces the effects of the
|
|
* UMC8669F bug.
|
|
*/
|
|
divisor = siodivisor(comdefaultrclk, speed);
|
|
dlbl = divisor & 0xFF;
|
|
if (sp->dlbl != dlbl)
|
|
outb(iobase + com_dlbl, dlbl);
|
|
dlbh = divisor >> 8;
|
|
if (sp->dlbh != dlbh)
|
|
outb(iobase + com_dlbh, dlbh);
|
|
outb(iobase + com_cfcr, CFCR_8BITS);
|
|
sp->mcr = inb(iobase + com_mcr);
|
|
/*
|
|
* We don't want interrupts, but must be careful not to "disable"
|
|
* them by clearing the MCR_IENABLE bit, since that might cause
|
|
* an interrupt by floating the IRQ line.
|
|
*/
|
|
outb(iobase + com_mcr, (sp->mcr & MCR_IENABLE) | MCR_DTR | MCR_RTS);
|
|
}
|
|
|
|
static void
|
|
siocnclose(sp, iobase)
|
|
struct siocnstate *sp;
|
|
Port_t iobase;
|
|
{
|
|
/*
|
|
* Restore the device control registers.
|
|
*/
|
|
siocntxwait(iobase);
|
|
outb(iobase + com_cfcr, CFCR_DLAB | CFCR_8BITS);
|
|
if (sp->dlbl != inb(iobase + com_dlbl))
|
|
outb(iobase + com_dlbl, sp->dlbl);
|
|
if (sp->dlbh != inb(iobase + com_dlbh))
|
|
outb(iobase + com_dlbh, sp->dlbh);
|
|
outb(iobase + com_cfcr, sp->cfcr);
|
|
/*
|
|
* XXX damp oscillations of MCR_DTR and MCR_RTS by not restoring them.
|
|
*/
|
|
outb(iobase + com_mcr, sp->mcr | MCR_DTR | MCR_RTS);
|
|
outb(iobase + com_ier, sp->ier);
|
|
}
|
|
|
|
static void
|
|
sio_cnprobe(cp)
|
|
struct consdev *cp;
|
|
{
|
|
speed_t boot_speed;
|
|
u_char cfcr;
|
|
u_int divisor;
|
|
int s, unit;
|
|
struct siocnstate sp;
|
|
|
|
/*
|
|
* Find our first enabled console, if any. If it is a high-level
|
|
* console device, then initialize it and return successfully.
|
|
* If it is a low-level console device, then initialize it and
|
|
* return unsuccessfully. It must be initialized in both cases
|
|
* for early use by console drivers and debuggers. Initializing
|
|
* the hardware is not necessary in all cases, since the i/o
|
|
* routines initialize it on the fly, but it is necessary if
|
|
* input might arrive while the hardware is switched back to an
|
|
* uninitialized state. We can't handle multiple console devices
|
|
* yet because our low-level routines don't take a device arg.
|
|
* We trust the user to set the console flags properly so that we
|
|
* don't need to probe.
|
|
*/
|
|
cp->cn_pri = CN_DEAD;
|
|
|
|
for (unit = 0; unit < 16; unit++) { /* XXX need to know how many */
|
|
int flags;
|
|
|
|
if (resource_disabled("sio", unit))
|
|
continue;
|
|
if (resource_int_value("sio", unit, "flags", &flags))
|
|
continue;
|
|
if (COM_CONSOLE(flags) || COM_DEBUGGER(flags)) {
|
|
int port;
|
|
Port_t iobase;
|
|
|
|
if (resource_int_value("sio", unit, "port", &port))
|
|
continue;
|
|
iobase = port;
|
|
s = spltty();
|
|
if ((boothowto & RB_SERIAL) && COM_CONSOLE(flags)) {
|
|
boot_speed =
|
|
siocngetspeed(iobase, comdefaultrclk);
|
|
if (boot_speed)
|
|
comdefaultrate = boot_speed;
|
|
}
|
|
|
|
/*
|
|
* Initialize the divisor latch. We can't rely on
|
|
* siocnopen() to do this the first time, since it
|
|
* avoids writing to the latch if the latch appears
|
|
* to have the correct value. Also, if we didn't
|
|
* just read the speed from the hardware, then we
|
|
* need to set the speed in hardware so that
|
|
* switching it later is null.
|
|
*/
|
|
cfcr = inb(iobase + com_cfcr);
|
|
outb(iobase + com_cfcr, CFCR_DLAB | cfcr);
|
|
divisor = siodivisor(comdefaultrclk, comdefaultrate);
|
|
outb(iobase + com_dlbl, divisor & 0xff);
|
|
outb(iobase + com_dlbh, divisor >> 8);
|
|
outb(iobase + com_cfcr, cfcr);
|
|
|
|
siocnopen(&sp, iobase, comdefaultrate);
|
|
|
|
splx(s);
|
|
if (COM_CONSOLE(flags) && !COM_LLCONSOLE(flags)) {
|
|
siocnset(cp, unit);
|
|
cp->cn_pri = COM_FORCECONSOLE(flags)
|
|
|| boothowto & RB_SERIAL
|
|
? CN_REMOTE : CN_NORMAL;
|
|
siocniobase = iobase;
|
|
siocnunit = unit;
|
|
}
|
|
#ifdef GDB
|
|
if (COM_DEBUGGER(flags))
|
|
siogdbiobase = iobase;
|
|
#endif
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
sio_cninit(cp)
|
|
struct consdev *cp;
|
|
{
|
|
comconsole = cp->cn_unit;
|
|
}
|
|
|
|
static void
|
|
sio_cnterm(cp)
|
|
struct consdev *cp;
|
|
{
|
|
comconsole = -1;
|
|
}
|
|
|
|
static void
|
|
sio_cngrab(struct consdev *cp)
|
|
{
|
|
}
|
|
|
|
static void
|
|
sio_cnungrab(struct consdev *cp)
|
|
{
|
|
}
|
|
|
|
static int
|
|
sio_cngetc(struct consdev *cd)
|
|
{
|
|
int c;
|
|
Port_t iobase;
|
|
int s;
|
|
struct siocnstate sp;
|
|
speed_t speed;
|
|
|
|
if (cd != NULL && cd->cn_unit == siocnunit) {
|
|
iobase = siocniobase;
|
|
speed = comdefaultrate;
|
|
} else {
|
|
#ifdef GDB
|
|
iobase = siogdbiobase;
|
|
speed = gdbdefaultrate;
|
|
#else
|
|
return (-1);
|
|
#endif
|
|
}
|
|
s = spltty();
|
|
siocnopen(&sp, iobase, speed);
|
|
if (inb(iobase + com_lsr) & LSR_RXRDY)
|
|
c = inb(iobase + com_data);
|
|
else
|
|
c = -1;
|
|
siocnclose(&sp, iobase);
|
|
splx(s);
|
|
return (c);
|
|
}
|
|
|
|
static void
|
|
sio_cnputc(struct consdev *cd, int c)
|
|
{
|
|
int need_unlock;
|
|
int s;
|
|
struct siocnstate sp;
|
|
Port_t iobase;
|
|
speed_t speed;
|
|
|
|
if (cd != NULL && cd->cn_unit == siocnunit) {
|
|
iobase = siocniobase;
|
|
speed = comdefaultrate;
|
|
} else {
|
|
#ifdef GDB
|
|
iobase = siogdbiobase;
|
|
speed = gdbdefaultrate;
|
|
#else
|
|
return;
|
|
#endif
|
|
}
|
|
s = spltty();
|
|
need_unlock = 0;
|
|
if (!kdb_active && sio_inited == 2 && !mtx_owned(&sio_lock)) {
|
|
mtx_lock_spin(&sio_lock);
|
|
need_unlock = 1;
|
|
}
|
|
siocnopen(&sp, iobase, speed);
|
|
siocntxwait(iobase);
|
|
outb(iobase + com_data, c);
|
|
siocnclose(&sp, iobase);
|
|
if (need_unlock)
|
|
mtx_unlock_spin(&sio_lock);
|
|
splx(s);
|
|
}
|
|
|
|
/*
|
|
* Remote gdb(1) support.
|
|
*/
|
|
|
|
#if defined(GDB)
|
|
|
|
#include <gdb/gdb.h>
|
|
|
|
static gdb_probe_f siogdbprobe;
|
|
static gdb_init_f siogdbinit;
|
|
static gdb_term_f siogdbterm;
|
|
static gdb_getc_f siogdbgetc;
|
|
static gdb_putc_f siogdbputc;
|
|
|
|
GDB_DBGPORT(sio, siogdbprobe, siogdbinit, siogdbterm, siogdbgetc, siogdbputc);
|
|
|
|
static int
|
|
siogdbprobe(void)
|
|
{
|
|
return ((siogdbiobase != 0) ? 0 : -1);
|
|
}
|
|
|
|
static void
|
|
siogdbinit(void)
|
|
{
|
|
}
|
|
|
|
static void
|
|
siogdbterm(void)
|
|
{
|
|
}
|
|
|
|
static void
|
|
siogdbputc(int c)
|
|
{
|
|
sio_cnputc(NULL, c);
|
|
}
|
|
|
|
static int
|
|
siogdbgetc(void)
|
|
{
|
|
return (sio_cngetc(NULL));
|
|
}
|
|
|
|
#endif
|