isa_dma.c revision 233675
145720Speter/*- 245720Speter * Copyright (c) 1991 The Regents of the University of California. 345720Speter * All rights reserved. 445720Speter * 545720Speter * This code is derived from software contributed to Berkeley by 645720Speter * William Jolitz. 745720Speter * 845720Speter * Redistribution and use in source and binary forms, with or without 945720Speter * modification, are permitted provided that the following conditions 1045720Speter * are met: 1145720Speter * 1. Redistributions of source code must retain the above copyright 1245720Speter * notice, this list of conditions and the following disclaimer. 1345720Speter * 2. Redistributions in binary form must reproduce the above copyright 1445720Speter * notice, this list of conditions and the following disclaimer in the 1545720Speter * documentation and/or other materials provided with the distribution. 1645720Speter * 4. Neither the name of the University nor the names of its contributors 1745720Speter * may be used to endorse or promote products derived from this software 1845720Speter * without specific prior written permission. 1945720Speter * 2045720Speter * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2145720Speter * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2245720Speter * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2345720Speter * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2445720Speter * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2545720Speter * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2645720Speter * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2745720Speter * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2845720Speter * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2945720Speter * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3045720Speter * SUCH DAMAGE. 3145720Speter * 3245720Speter * from: @(#)isa.c 7.2 (Berkeley) 5/13/91 3345720Speter */ 3445720Speter 35115703Sobrien#include <sys/cdefs.h> 36115703Sobrien__FBSDID("$FreeBSD: head/sys/x86/isa/isa_dma.c 233675 2012-03-29 18:58:02Z jhb $"); 37115703Sobrien 3845720Speter/* 3945720Speter * code to manage AT bus 4045720Speter * 4145720Speter * 92/08/18 Frank P. MacLachlan (fpm@crash.cts.com): 4245720Speter * Fixed uninitialized variable problem and added code to deal 4345720Speter * with DMA page boundaries in isa_dmarangecheck(). Fixed word 4445720Speter * mode DMA count compution and reorganized DMA setup code in 4545720Speter * isa_dmastart() 4645720Speter */ 4745720Speter 4845720Speter#include <sys/param.h> 4945720Speter#include <sys/systm.h> 5061994Smsmith#include <sys/bus.h> 5161994Smsmith#include <sys/kernel.h> 5245720Speter#include <sys/malloc.h> 5377081Salfred#include <sys/lock.h> 5479224Sdillon#include <sys/proc.h> 5577081Salfred#include <sys/mutex.h> 5661994Smsmith#include <sys/module.h> 5745720Speter#include <vm/vm.h> 5845720Speter#include <vm/vm_param.h> 5945720Speter#include <vm/pmap.h> 60146214Snyan#include <isa/isareg.h> 6161994Smsmith#include <isa/isavar.h> 62146214Snyan#include <isa/isa_dmareg.h> 6345720Speter 64204309Sattilio#define ISARAM_END RAM_END 65204309Sattilio 6692765Salfredstatic int isa_dmarangecheck(caddr_t va, u_int length, int chan); 6745720Speter 6845720Speterstatic caddr_t dma_bouncebuf[8]; 6945720Speterstatic u_int dma_bouncebufsize[8]; 7045720Speterstatic u_int8_t dma_bounced = 0; 7145720Speterstatic u_int8_t dma_busy = 0; /* Used in isa_dmastart() */ 7245720Speterstatic u_int8_t dma_inuse = 0; /* User for acquire/release */ 7345720Speterstatic u_int8_t dma_auto_mode = 0; 74199104Srdivackystatic struct mtx isa_dma_lock; 75199104SrdivackyMTX_SYSINIT(isa_dma_lock, &isa_dma_lock, "isa DMA lock", MTX_DEF); 7645720Speter 7745720Speter#define VALID_DMA_MASK (7) 7845720Speter 7945720Speter/* high byte of address is stored in this port for i-th dma channel */ 8045720Speterstatic int dmapageport[8] = { 0x87, 0x83, 0x81, 0x82, 0x8f, 0x8b, 0x89, 0x8a }; 8145720Speter 8245720Speter/* 8345720Speter * Setup a DMA channel's bounce buffer. 8445720Speter */ 85135262Sphkint 86135262Sphkisa_dma_init(int chan, u_int bouncebufsize, int flag) 8745720Speter{ 8845720Speter void *buf; 89199104Srdivacky int contig; 9045720Speter 9145720Speter#ifdef DIAGNOSTIC 9245720Speter if (chan & ~VALID_DMA_MASK) 93135262Sphk panic("isa_dma_init: channel out of range"); 9445720Speter#endif 9545720Speter 9645720Speter 9745720Speter /* Try malloc() first. It works better if it works. */ 98135262Sphk buf = malloc(bouncebufsize, M_DEVBUF, flag); 9945720Speter if (buf != NULL) { 100199104Srdivacky if (isa_dmarangecheck(buf, bouncebufsize, chan) != 0) { 101199104Srdivacky free(buf, M_DEVBUF); 102199104Srdivacky buf = NULL; 10345720Speter } 104199104Srdivacky contig = 0; 10545720Speter } 106199104Srdivacky 107199104Srdivacky if (buf == NULL) { 108199104Srdivacky buf = contigmalloc(bouncebufsize, M_DEVBUF, flag, 0ul, 0xfffffful, 10945720Speter 1ul, chan & 4 ? 0x20000ul : 0x10000ul); 110199104Srdivacky contig = 1; 111199104Srdivacky } 112199104Srdivacky 11345720Speter if (buf == NULL) 114135262Sphk return (ENOMEM); 115199104Srdivacky 116199104Srdivacky mtx_lock(&isa_dma_lock); 117199104Srdivacky /* 118199104Srdivacky * If a DMA channel is shared, both drivers have to call isa_dma_init 119199104Srdivacky * since they don't know that the other driver will do it. 120199104Srdivacky * Just return if we're already set up good. 121199104Srdivacky * XXX: this only works if they agree on the bouncebuf size. This 122199104Srdivacky * XXX: is typically the case since they are multiple instances of 123199104Srdivacky * XXX: the same driver. 124199104Srdivacky */ 125199104Srdivacky if (dma_bouncebuf[chan] != NULL) { 126199104Srdivacky if (contig) 127199104Srdivacky contigfree(buf, bouncebufsize, M_DEVBUF); 128199104Srdivacky else 129199104Srdivacky free(buf, M_DEVBUF); 130199104Srdivacky mtx_unlock(&isa_dma_lock); 131199104Srdivacky return (0); 132199104Srdivacky } 133199104Srdivacky 134199104Srdivacky dma_bouncebufsize[chan] = bouncebufsize; 135135262Sphk dma_bouncebuf[chan] = buf; 136199104Srdivacky 137199104Srdivacky mtx_unlock(&isa_dma_lock); 138199104Srdivacky 139135262Sphk return (0); 14045720Speter} 14145720Speter 14245720Speter/* 14345720Speter * Register a DMA channel's usage. Usually called from a device driver 14445720Speter * in open() or during its initialization. 14545720Speter */ 14645720Speterint 14745720Speterisa_dma_acquire(chan) 14845720Speter int chan; 14945720Speter{ 15045720Speter#ifdef DIAGNOSTIC 15145720Speter if (chan & ~VALID_DMA_MASK) 15245720Speter panic("isa_dma_acquire: channel out of range"); 15345720Speter#endif 15445720Speter 155199104Srdivacky mtx_lock(&isa_dma_lock); 15645720Speter if (dma_inuse & (1 << chan)) { 15745720Speter printf("isa_dma_acquire: channel %d already in use\n", chan); 158199104Srdivacky mtx_unlock(&isa_dma_lock); 15945720Speter return (EBUSY); 16045720Speter } 16145720Speter dma_inuse |= (1 << chan); 16245720Speter dma_auto_mode &= ~(1 << chan); 163199104Srdivacky mtx_unlock(&isa_dma_lock); 16445720Speter 16545720Speter return (0); 16645720Speter} 16745720Speter 16845720Speter/* 16945720Speter * Unregister a DMA channel's usage. Usually called from a device driver 17045720Speter * during close() or during its shutdown. 17145720Speter */ 17245720Spetervoid 17345720Speterisa_dma_release(chan) 17445720Speter int chan; 17545720Speter{ 17645720Speter#ifdef DIAGNOSTIC 17745720Speter if (chan & ~VALID_DMA_MASK) 17845720Speter panic("isa_dma_release: channel out of range"); 17945720Speter 180199104Srdivacky mtx_lock(&isa_dma_lock); 18145720Speter if ((dma_inuse & (1 << chan)) == 0) 18245720Speter printf("isa_dma_release: channel %d not in use\n", chan); 183199104Srdivacky#else 184199104Srdivacky mtx_lock(&isa_dma_lock); 18545720Speter#endif 18645720Speter 18745720Speter if (dma_busy & (1 << chan)) { 18845720Speter dma_busy &= ~(1 << chan); 18945720Speter /* 19045720Speter * XXX We should also do "dma_bounced &= (1 << chan);" 19145720Speter * because we are acting on behalf of isa_dmadone() which 19245720Speter * was not called to end the last DMA operation. This does 19345720Speter * not matter now, but it may in the future. 19445720Speter */ 19545720Speter } 19645720Speter 19745720Speter dma_inuse &= ~(1 << chan); 19845720Speter dma_auto_mode &= ~(1 << chan); 199199104Srdivacky 200199104Srdivacky mtx_unlock(&isa_dma_lock); 20145720Speter} 20245720Speter 20345720Speter/* 20445720Speter * isa_dmacascade(): program 8237 DMA controller channel to accept 20545720Speter * external dma control by a board. 20645720Speter */ 20745720Spetervoid 20845720Speterisa_dmacascade(chan) 20945720Speter int chan; 21045720Speter{ 21145720Speter#ifdef DIAGNOSTIC 21245720Speter if (chan & ~VALID_DMA_MASK) 21345720Speter panic("isa_dmacascade: channel out of range"); 21445720Speter#endif 21545720Speter 216199104Srdivacky mtx_lock(&isa_dma_lock); 21745720Speter /* set dma channel mode, and set dma channel mode */ 21845720Speter if ((chan & 4) == 0) { 21945720Speter outb(DMA1_MODE, DMA37MD_CASCADE | chan); 22045720Speter outb(DMA1_SMSK, chan); 22145720Speter } else { 22245720Speter outb(DMA2_MODE, DMA37MD_CASCADE | (chan & 3)); 22345720Speter outb(DMA2_SMSK, chan & 3); 22445720Speter } 225199104Srdivacky mtx_unlock(&isa_dma_lock); 22645720Speter} 22745720Speter 22845720Speter/* 22945720Speter * isa_dmastart(): program 8237 DMA controller channel, avoid page alignment 23045720Speter * problems by using a bounce buffer. 23145720Speter */ 23245720Spetervoid 23345720Speterisa_dmastart(int flags, caddr_t addr, u_int nbytes, int chan) 23445720Speter{ 235112569Sjake vm_paddr_t phys; 23645720Speter int waport; 23745720Speter caddr_t newaddr; 238199104Srdivacky int dma_range_checked; 23945720Speter 240199104Srdivacky dma_range_checked = isa_dmarangecheck(addr, nbytes, chan); 24179224Sdillon 24245720Speter#ifdef DIAGNOSTIC 24345720Speter if (chan & ~VALID_DMA_MASK) 24445720Speter panic("isa_dmastart: channel out of range"); 24545720Speter 24645720Speter if ((chan < 4 && nbytes > (1<<16)) 247204309Sattilio || (chan >= 4 && (nbytes > (1<<17) || (uintptr_t)addr & 1))) 24845720Speter panic("isa_dmastart: impossible request"); 24945720Speter 250199104Srdivacky mtx_lock(&isa_dma_lock); 25145720Speter if ((dma_inuse & (1 << chan)) == 0) 25245720Speter printf("isa_dmastart: channel %d not acquired\n", chan); 253199104Srdivacky#else 254199104Srdivacky mtx_lock(&isa_dma_lock); 25545720Speter#endif 25645720Speter 25745720Speter#if 0 25845720Speter /* 25945720Speter * XXX This should be checked, but drivers like ad1848 only call 26045720Speter * isa_dmastart() once because they use Auto DMA mode. If we 26145720Speter * leave this in, drivers that do this will print this continuously. 26245720Speter */ 26345720Speter if (dma_busy & (1 << chan)) 26445720Speter printf("isa_dmastart: channel %d busy\n", chan); 26545720Speter#endif 26645720Speter 26745720Speter dma_busy |= (1 << chan); 26845720Speter 269199104Srdivacky if (dma_range_checked) { 27045720Speter if (dma_bouncebuf[chan] == NULL 27145720Speter || dma_bouncebufsize[chan] < nbytes) 27245720Speter panic("isa_dmastart: bad bounce buffer"); 27345720Speter dma_bounced |= (1 << chan); 27445720Speter newaddr = dma_bouncebuf[chan]; 27545720Speter 27645720Speter /* copy bounce buffer on write */ 27757973Sphk if (!(flags & ISADMA_READ)) 27845720Speter bcopy(addr, newaddr, nbytes); 27945720Speter addr = newaddr; 28045720Speter } 28145720Speter 282233675Sjhb /* translate to physical */ 283233675Sjhb phys = pmap_extract(kernel_pmap, (vm_offset_t)addr); 284233675Sjhb 28557973Sphk if (flags & ISADMA_RAW) { 28645720Speter dma_auto_mode |= (1 << chan); 28745720Speter } else { 28845720Speter dma_auto_mode &= ~(1 << chan); 28945720Speter } 29045720Speter 29145720Speter if ((chan & 4) == 0) { 29245720Speter /* 29345720Speter * Program one of DMA channels 0..3. These are 29445720Speter * byte mode channels. 29545720Speter */ 29645720Speter /* set dma channel mode, and reset address ff */ 29745720Speter 29857973Sphk /* If ISADMA_RAW flag is set, then use autoinitialise mode */ 29957973Sphk if (flags & ISADMA_RAW) { 30057973Sphk if (flags & ISADMA_READ) 30145720Speter outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_WRITE|chan); 30245720Speter else 30345720Speter outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_READ|chan); 30445720Speter } 30545720Speter else 30657973Sphk if (flags & ISADMA_READ) 30745720Speter outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|chan); 30845720Speter else 30945720Speter outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_READ|chan); 31045720Speter outb(DMA1_FFC, 0); 31145720Speter 31245720Speter /* send start address */ 31345720Speter waport = DMA1_CHN(chan); 31445720Speter outb(waport, phys); 31545720Speter outb(waport, phys>>8); 31645720Speter outb(dmapageport[chan], phys>>16); 31745720Speter 31845720Speter /* send count */ 31945720Speter outb(waport + 1, --nbytes); 32045720Speter outb(waport + 1, nbytes>>8); 32145720Speter 32245720Speter /* unmask channel */ 32345720Speter outb(DMA1_SMSK, chan); 32445720Speter } else { 32545720Speter /* 32645720Speter * Program one of DMA channels 4..7. These are 32745720Speter * word mode channels. 32845720Speter */ 32945720Speter /* set dma channel mode, and reset address ff */ 33045720Speter 33157973Sphk /* If ISADMA_RAW flag is set, then use autoinitialise mode */ 33257973Sphk if (flags & ISADMA_RAW) { 33357973Sphk if (flags & ISADMA_READ) 33445720Speter outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_WRITE|(chan&3)); 33545720Speter else 33645720Speter outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_READ|(chan&3)); 33745720Speter } 33845720Speter else 33957973Sphk if (flags & ISADMA_READ) 34045720Speter outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|(chan&3)); 34145720Speter else 34245720Speter outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_READ|(chan&3)); 34345720Speter outb(DMA2_FFC, 0); 34445720Speter 34545720Speter /* send start address */ 34645720Speter waport = DMA2_CHN(chan - 4); 34745720Speter outb(waport, phys>>1); 34845720Speter outb(waport, phys>>9); 34945720Speter outb(dmapageport[chan], phys>>16); 35045720Speter 35145720Speter /* send count */ 35245720Speter nbytes >>= 1; 35345720Speter outb(waport + 2, --nbytes); 35445720Speter outb(waport + 2, nbytes>>8); 35545720Speter 35645720Speter /* unmask channel */ 35745720Speter outb(DMA2_SMSK, chan & 3); 35845720Speter } 359199104Srdivacky mtx_unlock(&isa_dma_lock); 36045720Speter} 36145720Speter 36245720Spetervoid 36345720Speterisa_dmadone(int flags, caddr_t addr, int nbytes, int chan) 36445720Speter{ 36545720Speter#ifdef DIAGNOSTIC 36645720Speter if (chan & ~VALID_DMA_MASK) 36745720Speter panic("isa_dmadone: channel out of range"); 36845720Speter 36945720Speter if ((dma_inuse & (1 << chan)) == 0) 37045720Speter printf("isa_dmadone: channel %d not acquired\n", chan); 37145720Speter#endif 37245720Speter 373199104Srdivacky mtx_lock(&isa_dma_lock); 37445720Speter if (((dma_busy & (1 << chan)) == 0) && 37545720Speter (dma_auto_mode & (1 << chan)) == 0 ) 37645720Speter printf("isa_dmadone: channel %d not busy\n", chan); 37745720Speter 37845720Speter if ((dma_auto_mode & (1 << chan)) == 0) 37945720Speter outb(chan & 4 ? DMA2_SMSK : DMA1_SMSK, (chan & 3) | 4); 38045720Speter 38145720Speter if (dma_bounced & (1 << chan)) { 38245720Speter /* copy bounce buffer on read */ 38357973Sphk if (flags & ISADMA_READ) 38445720Speter bcopy(dma_bouncebuf[chan], addr, nbytes); 38545720Speter 38645720Speter dma_bounced &= ~(1 << chan); 38745720Speter } 38845720Speter dma_busy &= ~(1 << chan); 389199104Srdivacky mtx_unlock(&isa_dma_lock); 39045720Speter} 39145720Speter 39245720Speter/* 39345720Speter * Check for problems with the address range of a DMA transfer 39445720Speter * (non-contiguous physical pages, outside of bus address space, 39545720Speter * crossing DMA page boundaries). 39645720Speter * Return true if special handling needed. 39745720Speter */ 39845720Speter 39945720Speterstatic int 40045720Speterisa_dmarangecheck(caddr_t va, u_int length, int chan) 40145720Speter{ 402112569Sjake vm_paddr_t phys, priorpage = 0; 403112569Sjake vm_offset_t endva; 40445720Speter u_int dma_pgmsk = (chan & 4) ? ~(128*1024-1) : ~(64*1024-1); 40545720Speter 40645720Speter endva = (vm_offset_t)round_page((vm_offset_t)va + length); 40745720Speter for (; va < (caddr_t) endva ; va += PAGE_SIZE) { 40895710Speter phys = trunc_page(pmap_extract(kernel_pmap, (vm_offset_t)va)); 40945720Speter if (phys == 0) 41045720Speter panic("isa_dmacheck: no physical page present"); 41145720Speter if (phys >= ISARAM_END) 41245720Speter return (1); 41345720Speter if (priorpage) { 41445720Speter if (priorpage + PAGE_SIZE != phys) 41545720Speter return (1); 41645720Speter /* check if crossing a DMA page boundary */ 41745720Speter if (((u_int)priorpage ^ (u_int)phys) & dma_pgmsk) 41845720Speter return (1); 41945720Speter } 42045720Speter priorpage = phys; 42145720Speter } 42245720Speter return (0); 42345720Speter} 42445720Speter 42545720Speter/* 42645720Speter * Query the progress of a transfer on a DMA channel. 42745720Speter * 42845720Speter * To avoid having to interrupt a transfer in progress, we sample 42945720Speter * each of the high and low databytes twice, and apply the following 43045720Speter * logic to determine the correct count. 43145720Speter * 43245720Speter * Reads are performed with interrupts disabled, thus it is to be 43345720Speter * expected that the time between reads is very small. At most 43445720Speter * one rollover in the low count byte can be expected within the 43545720Speter * four reads that are performed. 43645720Speter * 43745720Speter * There are three gaps in which a rollover can occur : 43845720Speter * 43945720Speter * - read low1 44045720Speter * gap1 44145720Speter * - read high1 44245720Speter * gap2 44345720Speter * - read low2 44445720Speter * gap3 44545720Speter * - read high2 44645720Speter * 44745720Speter * If a rollover occurs in gap1 or gap2, the low2 value will be 44845720Speter * greater than the low1 value. In this case, low2 and high2 are a 44945720Speter * corresponding pair. 45045720Speter * 45145720Speter * In any other case, low1 and high1 can be considered to be correct. 45245720Speter * 45345720Speter * The function returns the number of bytes remaining in the transfer, 45445720Speter * or -1 if the channel requested is not active. 45545720Speter * 45645720Speter */ 457199104Srdivackystatic int 458199104Srdivackyisa_dmastatus_locked(int chan) 45945720Speter{ 46045720Speter u_long cnt = 0; 46145720Speter int ffport, waport; 46245720Speter u_long low1, high1, low2, high2; 46345720Speter 464199104Srdivacky mtx_assert(&isa_dma_lock, MA_OWNED); 465199104Srdivacky 46645720Speter /* channel active? */ 46745720Speter if ((dma_inuse & (1 << chan)) == 0) { 46845720Speter printf("isa_dmastatus: channel %d not active\n", chan); 46945720Speter return(-1); 47045720Speter } 47145720Speter /* channel busy? */ 47245720Speter 47345720Speter if (((dma_busy & (1 << chan)) == 0) && 47445720Speter (dma_auto_mode & (1 << chan)) == 0 ) { 47545720Speter printf("chan %d not busy\n", chan); 47645720Speter return -2 ; 47745720Speter } 47845720Speter if (chan < 4) { /* low DMA controller */ 47945720Speter ffport = DMA1_FFC; 48045720Speter waport = DMA1_CHN(chan) + 1; 48145720Speter } else { /* high DMA controller */ 48245720Speter ffport = DMA2_FFC; 48345720Speter waport = DMA2_CHN(chan - 4) + 2; 48445720Speter } 48545720Speter 48645720Speter disable_intr(); /* no interrupts Mr Jones! */ 48745720Speter outb(ffport, 0); /* clear register LSB flipflop */ 48845720Speter low1 = inb(waport); 48945720Speter high1 = inb(waport); 49045720Speter outb(ffport, 0); /* clear again */ 49145720Speter low2 = inb(waport); 49245720Speter high2 = inb(waport); 49345720Speter enable_intr(); /* enable interrupts again */ 49445720Speter 49545720Speter /* 49645720Speter * Now decide if a wrap has tried to skew our results. 49745720Speter * Note that after TC, the count will read 0xffff, while we want 49845720Speter * to return zero, so we add and then mask to compensate. 49945720Speter */ 50045720Speter if (low1 >= low2) { 50145720Speter cnt = (low1 + (high1 << 8) + 1) & 0xffff; 50245720Speter } else { 50345720Speter cnt = (low2 + (high2 << 8) + 1) & 0xffff; 50445720Speter } 50545720Speter 50645720Speter if (chan >= 4) /* high channels move words */ 50745720Speter cnt *= 2; 50845720Speter return(cnt); 50945720Speter} 51045720Speter 511199104Srdivackyint 512199104Srdivackyisa_dmastatus(int chan) 513199104Srdivacky{ 514199104Srdivacky int status; 515199104Srdivacky 516199104Srdivacky mtx_lock(&isa_dma_lock); 517199104Srdivacky status = isa_dmastatus_locked(chan); 518199104Srdivacky mtx_unlock(&isa_dma_lock); 519199104Srdivacky 520199104Srdivacky return (status); 521199104Srdivacky} 522199104Srdivacky 52345720Speter/* 524141391Sphk * Reached terminal count yet ? 525141391Sphk */ 526141391Sphkint 527141391Sphkisa_dmatc(int chan) 528141391Sphk{ 529141391Sphk 530141391Sphk if (chan < 4) 531141391Sphk return(inb(DMA1_STATUS) & (1 << chan)); 532141391Sphk else 533141391Sphk return(inb(DMA2_STATUS) & (1 << (chan & 3))); 534141391Sphk} 535141391Sphk 536141391Sphk/* 53745720Speter * Stop a DMA transfer currently in progress. 53845720Speter */ 53945720Speterint 54045720Speterisa_dmastop(int chan) 54145720Speter{ 542199104Srdivacky int status; 543199104Srdivacky 544199104Srdivacky mtx_lock(&isa_dma_lock); 54545720Speter if ((dma_inuse & (1 << chan)) == 0) 54645720Speter printf("isa_dmastop: channel %d not acquired\n", chan); 54745720Speter 54845720Speter if (((dma_busy & (1 << chan)) == 0) && 54945720Speter ((dma_auto_mode & (1 << chan)) == 0)) { 55045720Speter printf("chan %d not busy\n", chan); 551199104Srdivacky mtx_unlock(&isa_dma_lock); 55245720Speter return -2 ; 55345720Speter } 55445720Speter 55545720Speter if ((chan & 4) == 0) { 55645720Speter outb(DMA1_SMSK, (chan & 3) | 4 /* disable mask */); 55745720Speter } else { 55845720Speter outb(DMA2_SMSK, (chan & 3) | 4 /* disable mask */); 55945720Speter } 560199104Srdivacky 561199104Srdivacky status = isa_dmastatus_locked(chan); 562199104Srdivacky 563199104Srdivacky mtx_unlock(&isa_dma_lock); 564199104Srdivacky 565199104Srdivacky return (status); 56645720Speter} 56761994Smsmith 56861994Smsmith/* 56961994Smsmith * Attach to the ISA PnP descriptor for the AT DMA controller 57061994Smsmith */ 57161994Smsmithstatic struct isa_pnp_id atdma_ids[] = { 57261994Smsmith { 0x0002d041 /* PNP0200 */, "AT DMA controller" }, 57361994Smsmith { 0 } 57461994Smsmith}; 57561994Smsmith 57661994Smsmithstatic int 57761994Smsmithatdma_probe(device_t dev) 57861994Smsmith{ 57961994Smsmith int result; 58061994Smsmith 58161994Smsmith if ((result = ISA_PNP_PROBE(device_get_parent(dev), dev, atdma_ids)) <= 0) 58261994Smsmith device_quiet(dev); 58361994Smsmith return(result); 58461994Smsmith} 58561994Smsmith 58661994Smsmithstatic int 58761994Smsmithatdma_attach(device_t dev) 58861994Smsmith{ 58961994Smsmith return(0); 59061994Smsmith} 59161994Smsmith 59261994Smsmithstatic device_method_t atdma_methods[] = { 59361994Smsmith /* Device interface */ 59461994Smsmith DEVMETHOD(device_probe, atdma_probe), 59561994Smsmith DEVMETHOD(device_attach, atdma_attach), 59661994Smsmith DEVMETHOD(device_detach, bus_generic_detach), 59761994Smsmith DEVMETHOD(device_shutdown, bus_generic_shutdown), 59861994Smsmith DEVMETHOD(device_suspend, bus_generic_suspend), 59961994Smsmith DEVMETHOD(device_resume, bus_generic_resume), 60061994Smsmith { 0, 0 } 60161994Smsmith}; 60261994Smsmith 60361994Smsmithstatic driver_t atdma_driver = { 60461994Smsmith "atdma", 60561994Smsmith atdma_methods, 60661994Smsmith 1, /* no softc */ 60761994Smsmith}; 60861994Smsmith 60961994Smsmithstatic devclass_t atdma_devclass; 61061994Smsmith 61161994SmsmithDRIVER_MODULE(atdma, isa, atdma_driver, atdma_devclass, 0, 0); 61282555SmsmithDRIVER_MODULE(atdma, acpi, atdma_driver, atdma_devclass, 0, 0); 613