53f83ec34c
handlers don't skew the results of isa_dmastatus. The function can be safely called with interrupts disabled. Submitted by: Stephen McKay <syssgm@dtir.qld.gov.au>
1001 lines
27 KiB
C
1001 lines
27 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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* This code is derived from software contributed to Berkeley by
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* William Jolitz.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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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: @(#)isa.c 7.2 (Berkeley) 5/13/91
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* $Id: isa.c,v 1.96 1997/07/24 05:27:39 msmith Exp $
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*/
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/*
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* code to manage AT bus
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*
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* 92/08/18 Frank P. MacLachlan (fpm@crash.cts.com):
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* Fixed uninitialized variable problem and added code to deal
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* with DMA page boundaries in isa_dmarangecheck(). Fixed word
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* mode DMA count compution and reorganized DMA setup code in
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* isa_dmastart()
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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/buf.h>
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#include <sys/malloc.h>
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#include <machine/ipl.h>
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#include <machine/md_var.h>
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#ifdef APIC_IO
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#include <machine/smp.h>
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#include <machine/apic.h>
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#endif /* APIC_IO */
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/pmap.h>
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#include <i386/isa/isa_device.h>
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#include <i386/isa/intr_machdep.h>
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#include <i386/isa/isa.h>
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#include <i386/isa/ic/i8237.h>
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#include <sys/interrupt.h>
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/*
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** Register definitions for DMA controller 1 (channels 0..3):
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*/
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#define DMA1_CHN(c) (IO_DMA1 + 1*(2*(c))) /* addr reg for channel c */
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#define DMA1_SMSK (IO_DMA1 + 1*10) /* single mask register */
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#define DMA1_MODE (IO_DMA1 + 1*11) /* mode register */
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#define DMA1_FFC (IO_DMA1 + 1*12) /* clear first/last FF */
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/*
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** Register definitions for DMA controller 2 (channels 4..7):
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*/
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#define DMA2_CHN(c) (IO_DMA2 + 2*(2*(c))) /* addr reg for channel c */
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#define DMA2_SMSK (IO_DMA2 + 2*10) /* single mask register */
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#define DMA2_MODE (IO_DMA2 + 2*11) /* mode register */
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#define DMA2_FFC (IO_DMA2 + 2*12) /* clear first/last FF */
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static void config_isadev __P((struct isa_device *isdp, u_int *mp));
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static void config_isadev_c __P((struct isa_device *isdp, u_int *mp,
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int reconfig));
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static void conflict __P((struct isa_device *dvp, struct isa_device *tmpdvp,
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int item, char const *whatnot, char const *reason,
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char const *format));
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static int haveseen __P((struct isa_device *dvp, struct isa_device *tmpdvp,
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u_int checkbits));
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static int isa_dmarangecheck __P((caddr_t va, u_int length, int chan));
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/*
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* print a conflict message
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*/
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static void
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conflict(dvp, tmpdvp, item, whatnot, reason, format)
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struct isa_device *dvp;
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struct isa_device *tmpdvp;
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int item;
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char const *whatnot;
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char const *reason;
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char const *format;
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{
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printf("%s%d not %sed due to %s conflict with %s%d at ",
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dvp->id_driver->name, dvp->id_unit, whatnot, reason,
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tmpdvp->id_driver->name, tmpdvp->id_unit);
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printf(format, item);
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printf("\n");
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}
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/*
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* Check to see if things are already in use, like IRQ's, I/O addresses
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* and Memory addresses.
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*/
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static int
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haveseen(dvp, tmpdvp, checkbits)
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struct isa_device *dvp;
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struct isa_device *tmpdvp;
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u_int checkbits;
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{
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/*
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* Only check against devices that have already been found and are not
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* unilaterally allowed to conflict anyway.
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*/
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if (tmpdvp->id_alive && !dvp->id_conflicts) {
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char const *whatnot;
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whatnot = checkbits & CC_ATTACH ? "attach" : "prob";
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/*
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* Check for I/O address conflict. We can only check the
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* starting address of the device against the range of the
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* device that has already been probed since we do not
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* know how many I/O addresses this device uses.
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*/
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if (checkbits & CC_IOADDR && tmpdvp->id_alive != -1) {
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if ((dvp->id_iobase >= tmpdvp->id_iobase) &&
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(dvp->id_iobase <=
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(tmpdvp->id_iobase + tmpdvp->id_alive - 1))) {
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conflict(dvp, tmpdvp, dvp->id_iobase, whatnot,
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"I/O address", "0x%x");
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return 1;
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}
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}
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/*
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* Check for Memory address conflict. We can check for
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* range overlap, but it will not catch all cases since the
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* driver may adjust the msize paramater during probe, for
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* now we just check that the starting address does not
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* fall within any allocated region.
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* XXX could add a second check after the probe for overlap,
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* since at that time we would know the full range.
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* XXX KERNBASE is a hack, we should have vaddr in the table!
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*/
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if (checkbits & CC_MEMADDR && tmpdvp->id_maddr) {
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if ((KERNBASE + dvp->id_maddr >= tmpdvp->id_maddr) &&
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(KERNBASE + dvp->id_maddr <=
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(tmpdvp->id_maddr + tmpdvp->id_msize - 1))) {
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conflict(dvp, tmpdvp, (int)dvp->id_maddr,
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whatnot, "maddr", "0x%x");
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return 1;
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}
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}
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/*
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* Check for IRQ conflicts.
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*/
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if (checkbits & CC_IRQ && tmpdvp->id_irq) {
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if (tmpdvp->id_irq == dvp->id_irq) {
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conflict(dvp, tmpdvp, ffs(dvp->id_irq) - 1,
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whatnot, "irq", "%d");
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return 1;
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}
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}
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/*
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* Check for DRQ conflicts.
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*/
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if (checkbits & CC_DRQ && tmpdvp->id_drq != -1) {
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if (tmpdvp->id_drq == dvp->id_drq) {
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conflict(dvp, tmpdvp, dvp->id_drq, whatnot,
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"drq", "%d");
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return 1;
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}
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}
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}
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return 0;
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}
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#ifdef RESOURCE_CHECK
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#include <sys/drvresource.h>
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static int
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checkone (struct isa_device *dvp, int type, addr_t low, addr_t high,
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char *resname, char *resfmt, int attaching)
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{
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int result = 0;
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if (bootverbose) {
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if (low == high)
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printf("\tcheck %s: 0x%x\n", resname, low);
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else
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printf("\tcheck %s: 0x%x to 0x%x\n",
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resname, low, high);
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}
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if (resource_check(type, RESF_NONE, low, high) != NULL) {
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char *whatnot = attaching ? "attach" : "prob";
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static struct isa_device dummydev;
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static struct isa_driver dummydrv;
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struct isa_device *tmpdvp = &dummydev;
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dummydev.id_driver = &dummydrv;
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dummydev.id_unit = 0;
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dummydrv.name = "pci";
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conflict(dvp, tmpdvp, low, whatnot, resname, resfmt);
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result = 1;
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} else if (attaching) {
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if (low == high)
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printf("\tregister %s: 0x%x\n", resname, low);
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else
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printf("\tregister %s: 0x%x to 0x%x\n",
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resname, low, high);
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resource_claim(dvp, type, RESF_NONE, low, high);
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}
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return (result);
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}
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static int
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check_pciconflict(struct isa_device *dvp, int checkbits)
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{
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int result = 0;
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int attaching = (checkbits & CC_ATTACH) != 0;
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if (checkbits & CC_MEMADDR) {
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long maddr = dvp->id_maddr;
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long msize = dvp->id_msize;
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if (msize > 0) {
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if (checkone(dvp, REST_MEM, maddr, maddr + msize - 1,
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"maddr", "0x%x", attaching) != 0) {
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result = 1;
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attaching = 0;
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}
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}
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}
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if (checkbits & CC_IOADDR) {
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unsigned iobase = dvp->id_iobase;
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unsigned iosize = dvp->id_alive;
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if (iosize == -1)
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iosize = 1; /* XXX can't do much about this ... */
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if (iosize > 0) {
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if (checkone(dvp, REST_PORT, iobase, iobase + iosize -1,
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"I/O address", "0x%x", attaching) != 0) {
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result = 1;
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attaching = 0;
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}
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}
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}
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if (checkbits & CC_IRQ) {
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int irq = ffs(dvp->id_irq) - 1;
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if (irq >= 0) {
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if (checkone(dvp, REST_INT, irq, irq,
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"irq", "%d", attaching) != 0) {
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result = 1;
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attaching = 0;
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}
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}
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}
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if (checkbits & CC_DRQ) {
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int drq = dvp->id_drq;
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if (drq >= 0) {
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if (checkone(dvp, REST_DMA, drq, drq,
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"drq", "%d", attaching) != 0) {
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result = 1;
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attaching = 0;
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}
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}
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}
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if (result != 0)
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resource_free (dvp);
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return (result);
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}
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#endif /* RESOURCE_CHECK */
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/*
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* Search through all the isa_devtab_* tables looking for anything that
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* conflicts with the current device.
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*/
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int
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haveseen_isadev(dvp, checkbits)
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struct isa_device *dvp;
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u_int checkbits;
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{
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struct isa_device *tmpdvp;
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int status = 0;
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for (tmpdvp = isa_devtab_tty; tmpdvp->id_driver; tmpdvp++) {
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status |= haveseen(dvp, tmpdvp, checkbits);
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if (status)
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return status;
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}
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for (tmpdvp = isa_devtab_bio; tmpdvp->id_driver; tmpdvp++) {
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status |= haveseen(dvp, tmpdvp, checkbits);
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if (status)
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return status;
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}
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for (tmpdvp = isa_devtab_net; tmpdvp->id_driver; tmpdvp++) {
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status |= haveseen(dvp, tmpdvp, checkbits);
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if (status)
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return status;
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}
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for (tmpdvp = isa_devtab_null; tmpdvp->id_driver; tmpdvp++) {
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status |= haveseen(dvp, tmpdvp, checkbits);
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if (status)
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return status;
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}
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#ifdef RESOURCE_CHECK
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if (!dvp->id_conflicts) {
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status = check_pciconflict(dvp, checkbits);
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} else if (bootverbose)
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printf("\tnot checking for resource conflicts ...\n");
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}
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#endif /* RESOURCE_CHECK */
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return(status);
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}
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/*
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* Configure all ISA devices
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*/
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void
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isa_configure() {
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struct isa_device *dvp;
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splhigh();
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printf("Probing for devices on the ISA bus:\n");
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/* First probe all the sensitive probes */
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for (dvp = isa_devtab_tty; dvp->id_driver; dvp++)
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if (dvp->id_driver->sensitive_hw)
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config_isadev(dvp, &tty_imask);
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for (dvp = isa_devtab_bio; dvp->id_driver; dvp++)
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if (dvp->id_driver->sensitive_hw)
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config_isadev(dvp, &bio_imask);
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for (dvp = isa_devtab_net; dvp->id_driver; dvp++)
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if (dvp->id_driver->sensitive_hw)
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config_isadev(dvp, &net_imask);
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for (dvp = isa_devtab_null; dvp->id_driver; dvp++)
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if (dvp->id_driver->sensitive_hw)
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config_isadev(dvp, (u_int *)NULL);
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/* Then all the bad ones */
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for (dvp = isa_devtab_tty; dvp->id_driver; dvp++)
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if (!dvp->id_driver->sensitive_hw)
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config_isadev(dvp, &tty_imask);
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for (dvp = isa_devtab_bio; dvp->id_driver; dvp++)
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if (!dvp->id_driver->sensitive_hw)
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config_isadev(dvp, &bio_imask);
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for (dvp = isa_devtab_net; dvp->id_driver; dvp++)
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if (!dvp->id_driver->sensitive_hw)
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config_isadev(dvp, &net_imask);
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for (dvp = isa_devtab_null; dvp->id_driver; dvp++)
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if (!dvp->id_driver->sensitive_hw)
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config_isadev(dvp, (u_int *)NULL);
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bio_imask |= SWI_CLOCK_MASK;
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net_imask |= SWI_NET_MASK;
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tty_imask |= SWI_TTY_MASK;
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/*
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* XXX we should really add the tty device to net_imask when the line is
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* switched to SLIPDISC, and then remove it when it is switched away from
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* SLIPDISC. No need to block out ALL ttys during a splimp when only one
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* of them is running slip.
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*
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* XXX actually, blocking all ttys during a splimp doesn't matter so much
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* with sio because the serial interrupt layer doesn't use tty_imask. Only
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* non-serial ttys suffer. It's more stupid that ALL 'net's are blocked
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* during spltty.
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*/
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#include "sl.h"
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#if NSL > 0
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net_imask |= tty_imask;
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tty_imask = net_imask;
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#endif
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/* bio_imask |= tty_imask ; can some tty devices use buffers? */
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if (bootverbose)
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printf("imasks: bio %x, tty %x, net %x\n",
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bio_imask, tty_imask, net_imask);
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/*
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* Finish initializing intr_mask[]. Note that the partly
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* constructed masks aren't actually used since we're at splhigh.
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* For fully dynamic initialization, register_intr() and
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* icu_unset() will have to adjust the masks for _all_
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* interrupts and for tty_imask, etc.
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*/
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for (dvp = isa_devtab_tty; dvp->id_driver; dvp++)
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register_imask(dvp, tty_imask);
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for (dvp = isa_devtab_bio; dvp->id_driver; dvp++)
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register_imask(dvp, bio_imask);
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for (dvp = isa_devtab_net; dvp->id_driver; dvp++)
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register_imask(dvp, net_imask);
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for (dvp = isa_devtab_null; dvp->id_driver; dvp++)
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register_imask(dvp, SWI_CLOCK_MASK);
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spl0();
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}
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/*
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* Configure an ISA device.
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*/
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static void
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config_isadev(isdp, mp)
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struct isa_device *isdp;
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u_int *mp;
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{
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config_isadev_c(isdp, mp, 0);
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}
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void
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reconfig_isadev(isdp, mp)
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struct isa_device *isdp;
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u_int *mp;
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{
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config_isadev_c(isdp, mp, 1);
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}
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static void
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config_isadev_c(isdp, mp, reconfig)
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struct isa_device *isdp;
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u_int *mp;
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int reconfig;
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{
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u_int checkbits;
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int id_alive;
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int last_alive;
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struct isa_driver *dp = isdp->id_driver;
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if (!isdp->id_enabled) {
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printf("%s%d: disabled, not probed.\n",
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dp->name, isdp->id_unit);
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return;
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}
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checkbits = CC_DRQ | CC_IOADDR | CC_MEMADDR;
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if (!reconfig && haveseen_isadev(isdp, checkbits))
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return;
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if (!reconfig && isdp->id_maddr) {
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isdp->id_maddr -= ISA_HOLE_START;
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isdp->id_maddr += atdevbase;
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}
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if (reconfig) {
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last_alive = isdp->id_alive;
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isdp->id_reconfig = 1;
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}
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else {
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last_alive = 0;
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isdp->id_reconfig = 0;
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}
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id_alive = (*dp->probe)(isdp);
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if (id_alive) {
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/*
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* Only print the I/O address range if id_alive != -1
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* Right now this is a temporary fix just for the new
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* NPX code so that if it finds a 486 that can use trap
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* 16 it will not report I/O addresses.
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* Rod Grimes 04/26/94
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*/
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if (!isdp->id_reconfig) {
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|
printf("%s%d", dp->name, isdp->id_unit);
|
|
if (id_alive != -1) {
|
|
if (isdp->id_iobase == -1)
|
|
printf(" at ?");
|
|
else {
|
|
printf(" at 0x%x", isdp->id_iobase);
|
|
if (isdp->id_iobase + id_alive - 1 !=
|
|
isdp->id_iobase) {
|
|
printf("-0x%x",
|
|
isdp->id_iobase + id_alive - 1);
|
|
}
|
|
}
|
|
}
|
|
if (isdp->id_irq)
|
|
printf(" irq %d", ffs(isdp->id_irq) - 1);
|
|
if (isdp->id_drq != -1)
|
|
printf(" drq %d", isdp->id_drq);
|
|
if (isdp->id_maddr)
|
|
printf(" maddr 0x%lx", kvtop(isdp->id_maddr));
|
|
if (isdp->id_msize)
|
|
printf(" msize %d", isdp->id_msize);
|
|
if (isdp->id_flags)
|
|
printf(" flags 0x%x", isdp->id_flags);
|
|
if (isdp->id_iobase && !(isdp->id_iobase & 0xf300)) {
|
|
printf(" on motherboard");
|
|
} else if (isdp->id_iobase >= 0x1000 &&
|
|
!(isdp->id_iobase & 0x300)) {
|
|
printf (" on eisa slot %d",
|
|
isdp->id_iobase >> 12);
|
|
} else {
|
|
printf (" on isa");
|
|
}
|
|
printf("\n");
|
|
/*
|
|
* Check for conflicts again. The driver may have
|
|
* changed *dvp. We should weaken the early check
|
|
* since the driver may have been able to change
|
|
* *dvp to avoid conflicts if given a chance. We
|
|
* already skip the early check for IRQs and force
|
|
* a check for IRQs in the next group of checks.
|
|
*/
|
|
checkbits |= CC_IRQ;
|
|
if (haveseen_isadev(isdp, checkbits)) {
|
|
return;
|
|
}
|
|
isdp->id_alive = id_alive;
|
|
}
|
|
(*dp->attach)(isdp);
|
|
if (isdp->id_irq) {
|
|
#ifdef APIC_IO
|
|
/*
|
|
* Some motherboards use upper IRQs for traditional
|
|
* ISA INTerrupt sources. In particular we have
|
|
* seen the secondary IDE connected to IRQ20.
|
|
* This code detects and fixes this situation.
|
|
*/
|
|
u_int apic_mask;
|
|
int rirq;
|
|
|
|
apic_mask = isa_apic_mask(isdp->id_irq);
|
|
if (apic_mask != isdp->id_irq) {
|
|
rirq = ffs(isdp->id_irq) - 1;
|
|
isdp->id_irq = apic_mask;
|
|
undirect_isa_irq(rirq); /* free for ISA */
|
|
}
|
|
#endif /* APIC_IO */
|
|
register_intr(ffs(isdp->id_irq) - 1, isdp->id_id,
|
|
isdp->id_ri_flags, isdp->id_intr,
|
|
mp, isdp->id_unit);
|
|
}
|
|
} else {
|
|
if (isdp->id_reconfig) {
|
|
(*dp->attach)(isdp); /* reconfiguration attach */
|
|
}
|
|
if (!last_alive) {
|
|
if (!isdp->id_reconfig) {
|
|
printf("%s%d not found",
|
|
dp->name, isdp->id_unit);
|
|
if (isdp->id_iobase != -1)
|
|
printf(" at 0x%x", isdp->id_iobase);
|
|
printf("\n");
|
|
}
|
|
}
|
|
else {
|
|
#if 0
|
|
/* This code has not been tested.... */
|
|
if (isdp->id_irq) {
|
|
icu_unset(ffs(isdp->id_irq) - 1,
|
|
isdp->id_intr);
|
|
if (mp)
|
|
INTRUNMASK(*mp, isdp->id_irq);
|
|
}
|
|
#else
|
|
printf ("icu_unset() not supported here ...\n");
|
|
#endif
|
|
}
|
|
}
|
|
}
|
|
|
|
static caddr_t dma_bouncebuf[8];
|
|
static u_int dma_bouncebufsize[8];
|
|
static u_int8_t dma_bounced = 0;
|
|
static u_int8_t dma_busy = 0; /* Used in isa_dmastart() */
|
|
static u_int8_t dma_inuse = 0; /* User for acquire/release */
|
|
|
|
#define VALID_DMA_MASK (7)
|
|
|
|
/* high byte of address is stored in this port for i-th dma channel */
|
|
static int dmapageport[8] = { 0x87, 0x83, 0x81, 0x82, 0x8f, 0x8b, 0x89, 0x8a };
|
|
|
|
/*
|
|
* Setup a DMA channel's bounce buffer.
|
|
*/
|
|
void
|
|
isa_dmainit(chan, bouncebufsize)
|
|
int chan;
|
|
u_int bouncebufsize;
|
|
{
|
|
void *buf;
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if (chan & ~VALID_DMA_MASK)
|
|
panic("isa_dmainit: channel out of range");
|
|
|
|
if (dma_bouncebuf[chan] != NULL)
|
|
panic("isa_dmainit: impossible request");
|
|
#endif
|
|
|
|
dma_bouncebufsize[chan] = bouncebufsize;
|
|
|
|
/* Try malloc() first. It works better if it works. */
|
|
buf = malloc(bouncebufsize, M_DEVBUF, M_NOWAIT);
|
|
if (buf != NULL) {
|
|
if (isa_dmarangecheck(buf, bouncebufsize, chan) == 0) {
|
|
dma_bouncebuf[chan] = buf;
|
|
return;
|
|
}
|
|
free(buf, M_DEVBUF);
|
|
}
|
|
buf = contigmalloc(bouncebufsize, M_DEVBUF, M_NOWAIT, 0ul, 0xfffffful,
|
|
1ul, chan & 4 ? 0x20000ul : 0x10000ul);
|
|
if (buf == NULL)
|
|
printf("isa_dmainit(%d, %d) failed\n", chan, bouncebufsize);
|
|
else
|
|
dma_bouncebuf[chan] = buf;
|
|
}
|
|
|
|
/*
|
|
* Register a DMA channel's usage. Usually called from a device driver
|
|
* in open() or during it's initialization.
|
|
*/
|
|
int
|
|
isa_dma_acquire(chan)
|
|
int chan;
|
|
{
|
|
#ifdef DIAGNOSTIC
|
|
if (chan & ~VALID_DMA_MASK)
|
|
panic("isa_dma_acquire: channel out of range");
|
|
#endif
|
|
|
|
if (dma_inuse & (1 << chan)) {
|
|
printf("isa_dma_acquire: channel %d already in use\n", chan);
|
|
return (EBUSY);
|
|
}
|
|
dma_inuse |= (1 << chan);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Unregister a DMA channel's usage. Usually called from a device driver
|
|
* during close() or during it's shutdown.
|
|
*/
|
|
void
|
|
isa_dma_release(chan)
|
|
int chan;
|
|
{
|
|
#ifdef DIAGNOSTIC
|
|
if (chan & ~VALID_DMA_MASK)
|
|
panic("isa_dma_release: channel out of range");
|
|
|
|
if (dma_inuse & (1 << chan) == 0)
|
|
printf("isa_dma_release: channel %d not in use\n", chan);
|
|
#endif
|
|
|
|
if (dma_busy & (1 << chan)) {
|
|
dma_busy &= ~(1 << chan);
|
|
/*
|
|
* XXX We should also do "dma_bounced &= (1 << chan);"
|
|
* because we are acting on behalf of isa_dmadone() which
|
|
* was not called to end the last DMA operation. This does
|
|
* not matter now, but it may in the future.
|
|
*/
|
|
}
|
|
|
|
dma_inuse &= ~(1 << chan);
|
|
}
|
|
|
|
/*
|
|
* isa_dmacascade(): program 8237 DMA controller channel to accept
|
|
* external dma control by a board.
|
|
*/
|
|
void isa_dmacascade(chan)
|
|
int chan;
|
|
{
|
|
#ifdef DIAGNOSTIC
|
|
if (chan & ~VALID_DMA_MASK)
|
|
panic("isa_dmacascade: channel out of range");
|
|
#endif
|
|
|
|
/* set dma channel mode, and set dma channel mode */
|
|
if ((chan & 4) == 0) {
|
|
outb(DMA1_MODE, DMA37MD_CASCADE | chan);
|
|
outb(DMA1_SMSK, chan);
|
|
} else {
|
|
outb(DMA2_MODE, DMA37MD_CASCADE | (chan & 3));
|
|
outb(DMA2_SMSK, chan & 3);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* isa_dmastart(): program 8237 DMA controller channel, avoid page alignment
|
|
* problems by using a bounce buffer.
|
|
*/
|
|
void isa_dmastart(int flags, caddr_t addr, u_int nbytes, int chan)
|
|
{
|
|
vm_offset_t phys;
|
|
int waport;
|
|
caddr_t newaddr;
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if (chan & ~VALID_DMA_MASK)
|
|
panic("isa_dmastart: channel out of range");
|
|
|
|
if ((chan < 4 && nbytes > (1<<16))
|
|
|| (chan >= 4 && (nbytes > (1<<17) || (u_int)addr & 1)))
|
|
panic("isa_dmastart: impossible request");
|
|
|
|
if (dma_inuse & (1 << chan) == 0)
|
|
printf("isa_dmastart: channel %d not acquired\n", chan);
|
|
#endif
|
|
|
|
#if 0
|
|
/*
|
|
* XXX This should be checked, but drivers like ad1848 only call
|
|
* isa_dmastart() once because they use Auto DMA mode. If we
|
|
* leave this in, drivers that do this will print this continuously.
|
|
*/
|
|
if (dma_busy & (1 << chan))
|
|
printf("isa_dmastart: channel %d busy\n", chan);
|
|
#endif
|
|
|
|
dma_busy |= (1 << chan);
|
|
|
|
if (isa_dmarangecheck(addr, nbytes, chan)) {
|
|
if (dma_bouncebuf[chan] == NULL
|
|
|| dma_bouncebufsize[chan] < nbytes)
|
|
panic("isa_dmastart: bad bounce buffer");
|
|
dma_bounced |= (1 << chan);
|
|
newaddr = dma_bouncebuf[chan];
|
|
|
|
/* copy bounce buffer on write */
|
|
if (!(flags & B_READ))
|
|
bcopy(addr, newaddr, nbytes);
|
|
addr = newaddr;
|
|
}
|
|
|
|
/* translate to physical */
|
|
phys = pmap_extract(pmap_kernel(), (vm_offset_t)addr);
|
|
|
|
if ((chan & 4) == 0) {
|
|
/*
|
|
* Program one of DMA channels 0..3. These are
|
|
* byte mode channels.
|
|
*/
|
|
/* set dma channel mode, and reset address ff */
|
|
|
|
/* If B_RAW flag is set, then use autoinitialise mode */
|
|
if (flags & B_RAW) {
|
|
if (flags & B_READ)
|
|
outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_WRITE|chan);
|
|
else
|
|
outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_READ|chan);
|
|
}
|
|
else
|
|
if (flags & B_READ)
|
|
outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|chan);
|
|
else
|
|
outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_READ|chan);
|
|
outb(DMA1_FFC, 0);
|
|
|
|
/* send start address */
|
|
waport = DMA1_CHN(chan);
|
|
outb(waport, phys);
|
|
outb(waport, phys>>8);
|
|
outb(dmapageport[chan], phys>>16);
|
|
|
|
/* send count */
|
|
outb(waport + 1, --nbytes);
|
|
outb(waport + 1, nbytes>>8);
|
|
|
|
/* unmask channel */
|
|
outb(DMA1_SMSK, chan);
|
|
} else {
|
|
/*
|
|
* Program one of DMA channels 4..7. These are
|
|
* word mode channels.
|
|
*/
|
|
/* set dma channel mode, and reset address ff */
|
|
|
|
/* If B_RAW flag is set, then use autoinitialise mode */
|
|
if (flags & B_RAW) {
|
|
if (flags & B_READ)
|
|
outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_WRITE|(chan&3));
|
|
else
|
|
outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_READ|(chan&3));
|
|
}
|
|
else
|
|
if (flags & B_READ)
|
|
outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|(chan&3));
|
|
else
|
|
outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_READ|(chan&3));
|
|
outb(DMA2_FFC, 0);
|
|
|
|
/* send start address */
|
|
waport = DMA2_CHN(chan - 4);
|
|
outb(waport, phys>>1);
|
|
outb(waport, phys>>9);
|
|
outb(dmapageport[chan], phys>>16);
|
|
|
|
/* send count */
|
|
nbytes >>= 1;
|
|
outb(waport + 2, --nbytes);
|
|
outb(waport + 2, nbytes>>8);
|
|
|
|
/* unmask channel */
|
|
outb(DMA2_SMSK, chan & 3);
|
|
}
|
|
}
|
|
|
|
void isa_dmadone(int flags, caddr_t addr, int nbytes, int chan)
|
|
{
|
|
#ifdef DIAGNOSTIC
|
|
if (chan & ~VALID_DMA_MASK)
|
|
panic("isa_dmadone: channel out of range");
|
|
|
|
if (dma_inuse & (1 << chan) == 0)
|
|
printf("isa_dmadone: channel %d not acquired\n", chan);
|
|
#endif
|
|
|
|
#if 0
|
|
/*
|
|
* XXX This should be checked, but drivers like ad1848 only call
|
|
* isa_dmastart() once because they use Auto DMA mode. If we
|
|
* leave this in, drivers that do this will print this continuously.
|
|
*/
|
|
if (dma_busy & (1 << chan) == 0)
|
|
printf("isa_dmadone: channel %d not busy\n", chan);
|
|
#endif
|
|
|
|
if (dma_bounced & (1 << chan)) {
|
|
/* copy bounce buffer on read */
|
|
if (flags & B_READ)
|
|
bcopy(dma_bouncebuf[chan], addr, nbytes);
|
|
|
|
dma_bounced &= ~(1 << chan);
|
|
}
|
|
dma_busy &= ~(1 << chan);
|
|
}
|
|
|
|
/*
|
|
* Check for problems with the address range of a DMA transfer
|
|
* (non-contiguous physical pages, outside of bus address space,
|
|
* crossing DMA page boundaries).
|
|
* Return true if special handling needed.
|
|
*/
|
|
|
|
static int
|
|
isa_dmarangecheck(caddr_t va, u_int length, int chan) {
|
|
vm_offset_t phys, priorpage = 0, endva;
|
|
u_int dma_pgmsk = (chan & 4) ? ~(128*1024-1) : ~(64*1024-1);
|
|
|
|
endva = (vm_offset_t)round_page(va + length);
|
|
for (; va < (caddr_t) endva ; va += PAGE_SIZE) {
|
|
phys = trunc_page(pmap_extract(pmap_kernel(), (vm_offset_t)va));
|
|
#define ISARAM_END RAM_END
|
|
if (phys == 0)
|
|
panic("isa_dmacheck: no physical page present");
|
|
if (phys >= ISARAM_END)
|
|
return (1);
|
|
if (priorpage) {
|
|
if (priorpage + PAGE_SIZE != phys)
|
|
return (1);
|
|
/* check if crossing a DMA page boundary */
|
|
if (((u_int)priorpage ^ (u_int)phys) & dma_pgmsk)
|
|
return (1);
|
|
}
|
|
priorpage = phys;
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Query the progress of a transfer on a DMA channel.
|
|
*
|
|
* To avoid having to interrupt a transfer in progress, we sample
|
|
* each of the high and low databytes twice, and apply the following
|
|
* logic to determine the correct count.
|
|
*
|
|
* Reads are performed with interrupts disabled, thus it is to be
|
|
* expected that the time between reads is very small. At most
|
|
* one rollover in the low count byte can be expected within the
|
|
* four reads that are performed.
|
|
*
|
|
* There are three gaps in which a rollover can occur :
|
|
*
|
|
* - read low1
|
|
* gap1
|
|
* - read high1
|
|
* gap2
|
|
* - read low2
|
|
* gap3
|
|
* - read high2
|
|
*
|
|
* If a rollover occurs in gap1 or gap2, the low2 value will be
|
|
* greater than the low1 value. In this case, low2 and high2 are a
|
|
* corresponding pair.
|
|
*
|
|
* In any other case, low1 and high1 can be considered to be correct.
|
|
*
|
|
* The function returns the number of bytes remaining in the transfer,
|
|
* or -1 if the channel requested is not active.
|
|
*
|
|
*/
|
|
int
|
|
isa_dmastatus(int chan)
|
|
{
|
|
u_long cnt = 0;
|
|
int ffport, waport;
|
|
u_long low, high, low2, high2;
|
|
u_long ef;
|
|
|
|
/* channel active? */
|
|
if (dma_inuse & (1 << chan) == 0) {
|
|
printf("isa_dmastatus: channel %d not active\n", chan);
|
|
return(-1);
|
|
}
|
|
|
|
/* still busy? */
|
|
if (dma_busy & (1 << chan) == 0) {
|
|
return(0);
|
|
}
|
|
|
|
if (chan < 4) { /* low DMA controller */
|
|
ffport = DMA1_FFC;
|
|
waport = DMA1_CHN(chan) + 1;
|
|
} else { /* high DMA controller */
|
|
ffport = DMA2_FFC;
|
|
waport = DMA2_CHN(chan - 4) + 2;
|
|
}
|
|
|
|
ef = read_eflags(); /* get current flags */
|
|
disable_intr(); /* no interrupts Mr Jones! */
|
|
outb(ffport, 0); /* clear register LSB flipflop */
|
|
low = inb(waport);
|
|
high = inb(waport);
|
|
outb(ffport, 0); /* clear again (paranoia?) */
|
|
low2 = inb(waport);
|
|
high2 = inb(waport);
|
|
write_eflags(ef); /* restore flags */
|
|
|
|
/* now decide if a wrap has tried to skew our results */
|
|
if (low >= low2) {
|
|
cnt = low + (high << 8) + 1;
|
|
} else {
|
|
cnt = low2 + (high2 << 8) + 1;
|
|
}
|
|
cnt = (cnt + 1) & 0xffff;
|
|
|
|
if (chan >= 4) /* high channels move words */
|
|
cnt *= 2;
|
|
return(cnt);
|
|
}
|
|
|
|
/*
|
|
* Find the highest priority enabled display device. Since we can't
|
|
* distinguish display devices from ttys, depend on display devices
|
|
* being sensitive and before sensitive non-display devices (if any)
|
|
* in isa_devtab_tty.
|
|
*
|
|
* XXX we should add capability flags IAMDISPLAY and ISUPPORTCONSOLES.
|
|
*/
|
|
struct isa_device *
|
|
find_display()
|
|
{
|
|
struct isa_device *dvp;
|
|
|
|
for (dvp = isa_devtab_tty; dvp->id_driver != NULL; dvp++)
|
|
if (dvp->id_driver->sensitive_hw && dvp->id_enabled)
|
|
return (dvp);
|
|
return (NULL);
|
|
}
|
|
|
|
/*
|
|
* find an ISA device in a given isa_devtab_* table, given
|
|
* the table to search, the expected id_driver entry, and the unit number.
|
|
*
|
|
* this function is defined in isa_device.h, and this location is debatable;
|
|
* i put it there because it's useless w/o, and directly operates on
|
|
* the other stuff in that file.
|
|
*
|
|
*/
|
|
|
|
struct isa_device *find_isadev(table, driverp, unit)
|
|
struct isa_device *table;
|
|
struct isa_driver *driverp;
|
|
int unit;
|
|
{
|
|
if (driverp == NULL) /* sanity check */
|
|
return (NULL);
|
|
|
|
while ((table->id_driver != driverp) || (table->id_unit != unit)) {
|
|
if (table->id_driver == 0)
|
|
return NULL;
|
|
|
|
table++;
|
|
}
|
|
|
|
return (table);
|
|
}
|
|
|