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- /*-
- * SPDX-License-Identifier: BSD-3-Clause
- *
- * 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. 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
- */
- #include <sys/cdefs.h>
- __FBSDID("$FreeBSD$");
- /*
- * 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/bus.h>
- #include <sys/kernel.h>
- #include <sys/malloc.h>
- #include <sys/lock.h>
- #include <sys/proc.h>
- #include <sys/mutex.h>
- #include <sys/module.h>
- #include <vm/vm.h>
- #include <vm/vm_param.h>
- #include <vm/pmap.h>
- #include <isa/isareg.h>
- #include <isa/isavar.h>
- #include <isa/isa_dmareg.h>
- #define ISARAM_END 0x1000000
- static int isa_dmarangecheck(caddr_t va, u_int length, int chan);
- 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;
- static struct mtx isa_dma_lock;
- MTX_SYSINIT(isa_dma_lock, &isa_dma_lock, "isa DMA lock", MTX_DEF);
- #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.
- */
- int
- isa_dma_init(int chan, u_int bouncebufsize, int flag)
- {
- void *buf;
- int contig;
- #ifdef DIAGNOSTIC
- if (chan & ~VALID_DMA_MASK)
- panic("isa_dma_init: channel out of range");
- #endif
- /* Try malloc() first. It works better if it works. */
- buf = malloc(bouncebufsize, M_DEVBUF, flag);
- if (buf != NULL) {
- if (isa_dmarangecheck(buf, bouncebufsize, chan) != 0) {
- free(buf, M_DEVBUF);
- buf = NULL;
- }
- contig = 0;
- }
- if (buf == NULL) {
- buf = contigmalloc(bouncebufsize, M_DEVBUF, flag, 0ul, 0xfffffful,
- 1ul, chan & 4 ? 0x20000ul : 0x10000ul);
- contig = 1;
- }
- if (buf == NULL)
- return (ENOMEM);
- mtx_lock(&isa_dma_lock);
- /*
- * If a DMA channel is shared, both drivers have to call isa_dma_init
- * since they don't know that the other driver will do it.
- * Just return if we're already set up good.
- * XXX: this only works if they agree on the bouncebuf size. This
- * XXX: is typically the case since they are multiple instances of
- * XXX: the same driver.
- */
- if (dma_bouncebuf[chan] != NULL) {
- if (contig)
- contigfree(buf, bouncebufsize, M_DEVBUF);
- else
- free(buf, M_DEVBUF);
- mtx_unlock(&isa_dma_lock);
- return (0);
- }
- dma_bouncebufsize[chan] = bouncebufsize;
- dma_bouncebuf[chan] = buf;
- mtx_unlock(&isa_dma_lock);
- return (0);
- }
- /*
- * Register a DMA channel's usage. Usually called from a device driver
- * in open() or during its initialization.
- */
- int
- isa_dma_acquire(int chan)
- {
- #ifdef DIAGNOSTIC
- if (chan & ~VALID_DMA_MASK)
- panic("isa_dma_acquire: channel out of range");
- #endif
- mtx_lock(&isa_dma_lock);
- if (dma_inuse & (1 << chan)) {
- printf("isa_dma_acquire: channel %d already in use\n", chan);
- mtx_unlock(&isa_dma_lock);
- return (EBUSY);
- }
- dma_inuse |= (1 << chan);
- dma_auto_mode &= ~(1 << chan);
- mtx_unlock(&isa_dma_lock);
- return (0);
- }
- /*
- * Unregister a DMA channel's usage. Usually called from a device driver
- * during close() or during its shutdown.
- */
- void
- isa_dma_release(int chan)
- {
- #ifdef DIAGNOSTIC
- if (chan & ~VALID_DMA_MASK)
- panic("isa_dma_release: channel out of range");
- mtx_lock(&isa_dma_lock);
- if ((dma_inuse & (1 << chan)) == 0)
- printf("isa_dma_release: channel %d not in use\n", chan);
- #else
- mtx_lock(&isa_dma_lock);
- #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);
- mtx_unlock(&isa_dma_lock);
- }
- /*
- * isa_dmacascade(): program 8237 DMA controller channel to accept
- * external dma control by a board.
- */
- void
- isa_dmacascade(int chan)
- {
- #ifdef DIAGNOSTIC
- if (chan & ~VALID_DMA_MASK)
- panic("isa_dmacascade: channel out of range");
- #endif
- mtx_lock(&isa_dma_lock);
- /* 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);
- }
- mtx_unlock(&isa_dma_lock);
- }
- /*
- * 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_paddr_t phys;
- int waport;
- caddr_t newaddr;
- int dma_range_checked;
- dma_range_checked = isa_dmarangecheck(addr, nbytes, chan);
- #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) || (uintptr_t)addr & 1)))
- panic("isa_dmastart: impossible request");
- mtx_lock(&isa_dma_lock);
- if ((dma_inuse & (1 << chan)) == 0)
- printf("isa_dmastart: channel %d not acquired\n", chan);
- #else
- mtx_lock(&isa_dma_lock);
- #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 (dma_range_checked) {
- 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 & ISADMA_READ))
- bcopy(addr, newaddr, nbytes);
- addr = newaddr;
- }
- /* translate to physical */
- phys = pmap_extract(kernel_pmap, (vm_offset_t)addr);
- if (flags & ISADMA_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 ISADMA_RAW flag is set, then use autoinitialise mode */
- if (flags & ISADMA_RAW) {
- if (flags & ISADMA_READ)
- outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_WRITE|chan);
- else
- outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_READ|chan);
- }
- else
- if (flags & ISADMA_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 ISADMA_RAW flag is set, then use autoinitialise mode */
- if (flags & ISADMA_RAW) {
- if (flags & ISADMA_READ)
- outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_WRITE|(chan&3));
- else
- outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_READ|(chan&3));
- }
- else
- if (flags & ISADMA_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);
- }
- mtx_unlock(&isa_dma_lock);
- }
- 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
- mtx_lock(&isa_dma_lock);
- if (((dma_busy & (1 << chan)) == 0) &&
- (dma_auto_mode & (1 << chan)) == 0 )
- printf("isa_dmadone: channel %d not busy\n", chan);
- if ((dma_auto_mode & (1 << chan)) == 0)
- outb(chan & 4 ? DMA2_SMSK : DMA1_SMSK, (chan & 3) | 4);
- if (dma_bounced & (1 << chan)) {
- /* copy bounce buffer on read */
- if (flags & ISADMA_READ)
- bcopy(dma_bouncebuf[chan], addr, nbytes);
- dma_bounced &= ~(1 << chan);
- }
- dma_busy &= ~(1 << chan);
- mtx_unlock(&isa_dma_lock);
- }
- /*
- * 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_paddr_t phys, priorpage = 0;
- vm_offset_t endva;
- u_int dma_pgmsk = (chan & 4) ? ~(128*1024-1) : ~(64*1024-1);
- endva = (vm_offset_t)round_page((vm_offset_t)va + length);
- for (; va < (caddr_t) endva ; va += PAGE_SIZE) {
- phys = trunc_page(pmap_extract(kernel_pmap, (vm_offset_t)va));
- 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.
- *
- */
- static int
- isa_dmastatus_locked(int chan)
- {
- u_long cnt = 0;
- int ffport, waport;
- u_long low1, high1, low2, high2;
- mtx_assert(&isa_dma_lock, MA_OWNED);
- /* 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);
- }
- int
- isa_dmastatus(int chan)
- {
- int status;
- mtx_lock(&isa_dma_lock);
- status = isa_dmastatus_locked(chan);
- mtx_unlock(&isa_dma_lock);
- return (status);
- }
- /*
- * Reached terminal count yet ?
- */
- int
- isa_dmatc(int chan)
- {
- if (chan < 4)
- return(inb(DMA1_STATUS) & (1 << chan));
- else
- return(inb(DMA2_STATUS) & (1 << (chan & 3)));
- }
- /*
- * Stop a DMA transfer currently in progress.
- */
- int
- isa_dmastop(int chan)
- {
- int status;
- mtx_lock(&isa_dma_lock);
- 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);
- mtx_unlock(&isa_dma_lock);
- return -2 ;
- }
-
- if ((chan & 4) == 0) {
- outb(DMA1_SMSK, (chan & 3) | 4 /* disable mask */);
- } else {
- outb(DMA2_SMSK, (chan & 3) | 4 /* disable mask */);
- }
- status = isa_dmastatus_locked(chan);
- mtx_unlock(&isa_dma_lock);
- return (status);
- }
- /*
- * Attach to the ISA PnP descriptor for the AT DMA controller
- */
- static struct isa_pnp_id atdma_ids[] = {
- { 0x0002d041 /* PNP0200 */, "AT DMA controller" },
- { 0 }
- };
- static int
- atdma_probe(device_t dev)
- {
- int result;
- if ((result = ISA_PNP_PROBE(device_get_parent(dev), dev, atdma_ids)) <= 0)
- device_quiet(dev);
- return(result);
- }
- static int
- atdma_attach(device_t dev)
- {
- return(0);
- }
- static device_method_t atdma_methods[] = {
- /* Device interface */
- DEVMETHOD(device_probe, atdma_probe),
- DEVMETHOD(device_attach, atdma_attach),
- DEVMETHOD(device_detach, bus_generic_detach),
- DEVMETHOD(device_shutdown, bus_generic_shutdown),
- DEVMETHOD(device_suspend, bus_generic_suspend),
- DEVMETHOD(device_resume, bus_generic_resume),
- { 0, 0 }
- };
- static driver_t atdma_driver = {
- "atdma",
- atdma_methods,
- 1, /* no softc */
- };
- static devclass_t atdma_devclass;
- DRIVER_MODULE(atdma, isa, atdma_driver, atdma_devclass, 0, 0);
- DRIVER_MODULE(atdma, acpi, atdma_driver, atdma_devclass, 0, 0);
- ISA_PNP_INFO(atdma_ids);
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