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freebsd-nq/sys/i386/isa/isa.c
John-Mark Gurney 77509afdf3 teach pnp to keep isa_device structs around, and teach isa.c how to scan 
these structs for conflics...

it still exist that two PnP cards can colide, but this is up to the user
to make sure it doesn't happen...

other modifications to pnp.c to format output properly, and hide more
output behind bootverbose flag...

fix some bugons in pnp.h that would of made it difficult for inclusion
in external programs (for import of pnpinfo)
1997-09-19 15:20:25 +00:00

1043 lines
28 KiB
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/*-
* Copyright (c) 1991 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: @(#)isa.c 7.2 (Berkeley) 5/13/91
* $Id: isa.c,v 1.103 1997/08/28 03:36:40 msmith Exp $
*/
/*
* code to manage AT bus
*
* 92/08/18 Frank P. MacLachlan (fpm@crash.cts.com):
* Fixed uninitialized variable problem and added code to deal
* with DMA page boundaries in isa_dmarangecheck(). Fixed word
* mode DMA count compution and reorganized DMA setup code in
* isa_dmastart()
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/malloc.h>
#include <machine/ipl.h>
#include <machine/md_var.h>
#ifdef APIC_IO
#include <machine/smp.h>
#endif /* APIC_IO */
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/pmap.h>
#include <i386/isa/isa_device.h>
#include <i386/isa/intr_machdep.h>
#include <i386/isa/isa.h>
#include <i386/isa/ic/i8237.h>
#include <sys/interrupt.h>
#include "pnp.h"
#if NPNP > 0
#include <i386/isa/pnp.h>
#endif
/*
** Register definitions for DMA controller 1 (channels 0..3):
*/
#define DMA1_CHN(c) (IO_DMA1 + 1*(2*(c))) /* addr reg for channel c */
#define DMA1_SMSK (IO_DMA1 + 1*10) /* single mask register */
#define DMA1_MODE (IO_DMA1 + 1*11) /* mode register */
#define DMA1_FFC (IO_DMA1 + 1*12) /* clear first/last FF */
/*
** Register definitions for DMA controller 2 (channels 4..7):
*/
#define DMA2_CHN(c) (IO_DMA2 + 2*(2*(c))) /* addr reg for channel c */
#define DMA2_SMSK (IO_DMA2 + 2*10) /* single mask register */
#define DMA2_MODE (IO_DMA2 + 2*11) /* mode register */
#define DMA2_FFC (IO_DMA2 + 2*12) /* clear first/last FF */
static void config_isadev __P((struct isa_device *isdp, u_int *mp));
static void config_isadev_c __P((struct isa_device *isdp, u_int *mp,
int reconfig));
static void conflict __P((struct isa_device *dvp, struct isa_device *tmpdvp,
int item, char const *whatnot, char const *reason,
char const *format));
static int haveseen __P((struct isa_device *dvp, struct isa_device *tmpdvp,
u_int checkbits));
static int isa_dmarangecheck __P((caddr_t va, u_int length, int chan));
/*
* print a conflict message
*/
static void
conflict(dvp, tmpdvp, item, whatnot, reason, format)
struct isa_device *dvp;
struct isa_device *tmpdvp;
int item;
char const *whatnot;
char const *reason;
char const *format;
{
printf("%s%d not %sed due to %s conflict with %s%d at ",
dvp->id_driver->name, dvp->id_unit, whatnot, reason,
tmpdvp->id_driver->name, tmpdvp->id_unit);
printf(format, item);
printf("\n");
}
/*
* Check to see if things are already in use, like IRQ's, I/O addresses
* and Memory addresses.
*/
static int
haveseen(dvp, tmpdvp, checkbits)
struct isa_device *dvp;
struct isa_device *tmpdvp;
u_int checkbits;
{
/*
* Ignore all conflicts except IRQ ones if conflicts are allowed.
*/
if (dvp->id_conflicts)
checkbits &= ~(CC_DRQ | CC_IOADDR | CC_MEMADDR);
/*
* Only check against devices that have already been found.
*/
if (tmpdvp->id_alive) {
char const *whatnot;
whatnot = checkbits & CC_ATTACH ? "attach" : "prob";
/*
* Check for I/O address conflict. We can only check the
* starting address of the device against the range of the
* device that has already been probed since we do not
* know how many I/O addresses this device uses.
*/
if (checkbits & CC_IOADDR && tmpdvp->id_alive != -1) {
if ((dvp->id_iobase >= tmpdvp->id_iobase) &&
(dvp->id_iobase <=
(tmpdvp->id_iobase + tmpdvp->id_alive - 1))) {
conflict(dvp, tmpdvp, dvp->id_iobase, whatnot,
"I/O address", "0x%x");
return 1;
}
}
/*
* Check for Memory address conflict. We can check for
* range overlap, but it will not catch all cases since the
* driver may adjust the msize paramater during probe, for
* now we just check that the starting address does not
* fall within any allocated region.
* XXX could add a second check after the probe for overlap,
* since at that time we would know the full range.
* XXX KERNBASE is a hack, we should have vaddr in the table!
*/
if (checkbits & CC_MEMADDR && tmpdvp->id_maddr) {
if ((KERNBASE + dvp->id_maddr >= tmpdvp->id_maddr) &&
(KERNBASE + dvp->id_maddr <=
(tmpdvp->id_maddr + tmpdvp->id_msize - 1))) {
conflict(dvp, tmpdvp, (int)dvp->id_maddr,
whatnot, "maddr", "0x%x");
return 1;
}
}
/*
* Check for IRQ conflicts.
*/
if (checkbits & CC_IRQ && tmpdvp->id_irq) {
if (tmpdvp->id_irq == dvp->id_irq) {
conflict(dvp, tmpdvp, ffs(dvp->id_irq) - 1,
whatnot, "irq", "%d");
return 1;
}
}
/*
* Check for DRQ conflicts.
*/
if (checkbits & CC_DRQ && tmpdvp->id_drq != -1) {
if (tmpdvp->id_drq == dvp->id_drq) {
conflict(dvp, tmpdvp, dvp->id_drq, whatnot,
"drq", "%d");
return 1;
}
}
}
return 0;
}
#ifdef RESOURCE_CHECK
#include <sys/drvresource.h>
static int
checkone (struct isa_device *dvp, int type, addr_t low, addr_t high,
char *resname, char *resfmt, int attaching)
{
int result = 0;
if (bootverbose) {
if (low == high)
printf("\tcheck %s: 0x%x\n", resname, low);
else
printf("\tcheck %s: 0x%x to 0x%x\n",
resname, low, high);
}
if (resource_check(type, RESF_NONE, low, high) != NULL) {
char *whatnot = attaching ? "attach" : "prob";
static struct isa_device dummydev;
static struct isa_driver dummydrv;
struct isa_device *tmpdvp = &dummydev;
dummydev.id_driver = &dummydrv;
dummydev.id_unit = 0;
dummydrv.name = "pci";
conflict(dvp, tmpdvp, low, whatnot, resname, resfmt);
result = 1;
} else if (attaching) {
if (low == high)
printf("\tregister %s: 0x%x\n", resname, low);
else
printf("\tregister %s: 0x%x to 0x%x\n",
resname, low, high);
resource_claim(dvp, type, RESF_NONE, low, high);
}
return (result);
}
static int
check_pciconflict(struct isa_device *dvp, int checkbits)
{
int result = 0;
int attaching = (checkbits & CC_ATTACH) != 0;
if (checkbits & CC_MEMADDR) {
long maddr = dvp->id_maddr;
long msize = dvp->id_msize;
if (msize > 0) {
if (checkone(dvp, REST_MEM, maddr, maddr + msize - 1,
"maddr", "0x%x", attaching) != 0) {
result = 1;
attaching = 0;
}
}
}
if (checkbits & CC_IOADDR) {
unsigned iobase = dvp->id_iobase;
unsigned iosize = dvp->id_alive;
if (iosize == -1)
iosize = 1; /* XXX can't do much about this ... */
if (iosize > 0) {
if (checkone(dvp, REST_PORT, iobase, iobase + iosize -1,
"I/O address", "0x%x", attaching) != 0) {
result = 1;
attaching = 0;
}
}
}
if (checkbits & CC_IRQ) {
int irq = ffs(dvp->id_irq) - 1;
if (irq >= 0) {
if (checkone(dvp, REST_INT, irq, irq,
"irq", "%d", attaching) != 0) {
result = 1;
attaching = 0;
}
}
}
if (checkbits & CC_DRQ) {
int drq = dvp->id_drq;
if (drq >= 0) {
if (checkone(dvp, REST_DMA, drq, drq,
"drq", "%d", attaching) != 0) {
result = 1;
attaching = 0;
}
}
}
if (result != 0)
resource_free (dvp);
return (result);
}
#endif /* RESOURCE_CHECK */
/*
* Search through all the isa_devtab_* tables looking for anything that
* conflicts with the current device.
*/
int
haveseen_isadev(dvp, checkbits)
struct isa_device *dvp;
u_int checkbits;
{
#if NPNP > 0
struct pnp_dlist_node *nod;
#endif
struct isa_device *tmpdvp;
int status = 0;
for (tmpdvp = isa_devtab_tty; tmpdvp->id_driver; tmpdvp++) {
status |= haveseen(dvp, tmpdvp, checkbits);
if (status)
return status;
}
for (tmpdvp = isa_devtab_bio; tmpdvp->id_driver; tmpdvp++) {
status |= haveseen(dvp, tmpdvp, checkbits);
if (status)
return status;
}
for (tmpdvp = isa_devtab_net; tmpdvp->id_driver; tmpdvp++) {
status |= haveseen(dvp, tmpdvp, checkbits);
if (status)
return status;
}
for (tmpdvp = isa_devtab_null; tmpdvp->id_driver; tmpdvp++) {
status |= haveseen(dvp, tmpdvp, checkbits);
if (status)
return status;
}
#if NPNP > 0
for (nod = pnp_device_list; nod != NULL; nod = nod->next)
if (status |= haveseen(dvp, &(nod->dev), checkbits))
return status;
#endif
#ifdef RESOURCE_CHECK
if (!dvp->id_conflicts) {
status = check_pciconflict(dvp, checkbits);
} else if (bootverbose)
printf("\tnot checking for resource conflicts ...\n");
}
#endif /* RESOURCE_CHECK */
return(status);
}
/*
* Configure all ISA devices
*/
void
isa_configure() {
struct isa_device *dvp;
splhigh();
printf("Probing for devices on the ISA bus:\n");
/* First probe all the sensitive probes */
for (dvp = isa_devtab_tty; dvp->id_driver; dvp++)
if (dvp->id_driver->sensitive_hw)
config_isadev(dvp, &tty_imask);
for (dvp = isa_devtab_bio; dvp->id_driver; dvp++)
if (dvp->id_driver->sensitive_hw)
config_isadev(dvp, &bio_imask);
for (dvp = isa_devtab_net; dvp->id_driver; dvp++)
if (dvp->id_driver->sensitive_hw)
config_isadev(dvp, &net_imask);
for (dvp = isa_devtab_null; dvp->id_driver; dvp++)
if (dvp->id_driver->sensitive_hw)
config_isadev(dvp, (u_int *)NULL);
/* Then all the bad ones */
for (dvp = isa_devtab_tty; dvp->id_driver; dvp++)
if (!dvp->id_driver->sensitive_hw)
config_isadev(dvp, &tty_imask);
for (dvp = isa_devtab_bio; dvp->id_driver; dvp++)
if (!dvp->id_driver->sensitive_hw)
config_isadev(dvp, &bio_imask);
for (dvp = isa_devtab_net; dvp->id_driver; dvp++)
if (!dvp->id_driver->sensitive_hw)
config_isadev(dvp, &net_imask);
for (dvp = isa_devtab_null; dvp->id_driver; dvp++)
if (!dvp->id_driver->sensitive_hw)
config_isadev(dvp, (u_int *)NULL);
bio_imask |= SWI_CLOCK_MASK;
net_imask |= SWI_NET_MASK;
tty_imask |= SWI_TTY_MASK;
/*
* XXX we should really add the tty device to net_imask when the line is
* switched to SLIPDISC, and then remove it when it is switched away from
* SLIPDISC. No need to block out ALL ttys during a splimp when only one
* of them is running slip.
*
* XXX actually, blocking all ttys during a splimp doesn't matter so much
* with sio because the serial interrupt layer doesn't use tty_imask. Only
* non-serial ttys suffer. It's more stupid that ALL 'net's are blocked
* during spltty.
*/
#include "sl.h"
#if NSL > 0
net_imask |= tty_imask;
tty_imask = net_imask;
#endif
/* bio_imask |= tty_imask ; can some tty devices use buffers? */
if (bootverbose)
printf("imasks: bio %x, tty %x, net %x\n",
bio_imask, tty_imask, net_imask);
/*
* Finish initializing intr_mask[]. Note that the partly
* constructed masks aren't actually used since we're at splhigh.
* For fully dynamic initialization, register_intr() and
* icu_unset() will have to adjust the masks for _all_
* interrupts and for tty_imask, etc.
*/
for (dvp = isa_devtab_tty; dvp->id_driver; dvp++)
register_imask(dvp, tty_imask);
for (dvp = isa_devtab_bio; dvp->id_driver; dvp++)
register_imask(dvp, bio_imask);
for (dvp = isa_devtab_net; dvp->id_driver; dvp++)
register_imask(dvp, net_imask);
for (dvp = isa_devtab_null; dvp->id_driver; dvp++)
register_imask(dvp, SWI_CLOCK_MASK);
spl0();
}
/*
* Configure an ISA device.
*/
static void
config_isadev(isdp, mp)
struct isa_device *isdp;
u_int *mp;
{
config_isadev_c(isdp, mp, 0);
}
void
reconfig_isadev(isdp, mp)
struct isa_device *isdp;
u_int *mp;
{
config_isadev_c(isdp, mp, 1);
}
static void
config_isadev_c(isdp, mp, reconfig)
struct isa_device *isdp;
u_int *mp;
int reconfig;
{
u_int checkbits;
int id_alive;
int last_alive;
struct isa_driver *dp = isdp->id_driver;
if (!isdp->id_enabled) {
printf("%s%d: disabled, not probed.\n",
dp->name, isdp->id_unit);
return;
}
checkbits = CC_DRQ | CC_IOADDR | CC_MEMADDR;
if (!reconfig && haveseen_isadev(isdp, checkbits))
return;
if (!reconfig && isdp->id_maddr) {
isdp->id_maddr -= ISA_HOLE_START;
isdp->id_maddr += atdevbase;
}
if (reconfig) {
last_alive = isdp->id_alive;
isdp->id_reconfig = 1;
}
else {
last_alive = 0;
isdp->id_reconfig = 0;
}
id_alive = (*dp->probe)(isdp);
if (id_alive) {
/*
* Only print the I/O address range if id_alive != -1
* Right now this is a temporary fix just for the new
* NPX code so that if it finds a 486 that can use trap
* 16 it will not report I/O addresses.
* Rod Grimes 04/26/94
*/
if (!isdp->id_reconfig) {
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 */
static u_int8_t dma_auto_mode = 0;
#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);
dma_auto_mode &= ~(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);
dma_auto_mode &= ~(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 (flags & B_RAW) {
dma_auto_mode |= (1 << chan);
} else {
dma_auto_mode &= ~(1 << chan);
}
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 (((dma_busy & (1 << chan)) == 0) &&
(dma_auto_mode & (1 << chan)) == 0 )
printf("isa_dmadone: channel %d not busy\n", chan);
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 low1, high1, low2, high2;
/* channel active? */
if ((dma_inuse & (1 << chan)) == 0) {
printf("isa_dmastatus: channel %d not active\n", chan);
return(-1);
}
/* channel busy? */
if (((dma_busy & (1 << chan)) == 0) &&
(dma_auto_mode & (1 << chan)) == 0 ) {
printf("chan %d not busy\n", chan);
return -2 ;
}
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;
}
disable_intr(); /* no interrupts Mr Jones! */
outb(ffport, 0); /* clear register LSB flipflop */
low1 = inb(waport);
high1 = inb(waport);
outb(ffport, 0); /* clear again */
low2 = inb(waport);
high2 = inb(waport);
enable_intr(); /* enable interrupts again */
/*
* Now decide if a wrap has tried to skew our results.
* Note that after TC, the count will read 0xffff, while we want
* to return zero, so we add and then mask to compensate.
*/
if (low1 >= low2) {
cnt = (low1 + (high1 << 8) + 1) & 0xffff;
} else {
cnt = (low2 + (high2 << 8) + 1) & 0xffff;
}
if (chan >= 4) /* high channels move words */
cnt *= 2;
return(cnt);
}
/*
* Stop a DMA transfer currently in progress.
*/
int
isa_dmastop(int chan)
{
if ((dma_inuse & (1 << chan)) == 0)
printf("isa_dmastop: channel %d not acquired\n", chan);
if (((dma_busy & (1 << chan)) == 0) &&
((dma_auto_mode & (1 << chan)) == 0)) {
printf("chan %d not busy\n", chan);
return -2 ;
}
if ((chan & 4) == 0) {
outb(DMA1_SMSK, (chan & 3) | 4 /* disable mask */);
} else {
outb(DMA2_SMSK, (chan & 3) | 4 /* disable mask */);
}
return(isa_dmastatus(chan));
}
/*
* 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);
}
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