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: stable/11/sys/x86/isa/isa_dma.c 332304 2018-04-08 20:52:09Z emaste $"); 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 64263379Simp#define ISARAM_END 0x1000000 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 147332304Semasteisa_dma_acquire(int chan) 14845720Speter{ 14945720Speter#ifdef DIAGNOSTIC 15045720Speter if (chan & ~VALID_DMA_MASK) 15145720Speter panic("isa_dma_acquire: channel out of range"); 15245720Speter#endif 15345720Speter 154199104Srdivacky mtx_lock(&isa_dma_lock); 15545720Speter if (dma_inuse & (1 << chan)) { 15645720Speter printf("isa_dma_acquire: channel %d already in use\n", chan); 157199104Srdivacky mtx_unlock(&isa_dma_lock); 15845720Speter return (EBUSY); 15945720Speter } 16045720Speter dma_inuse |= (1 << chan); 16145720Speter dma_auto_mode &= ~(1 << chan); 162199104Srdivacky mtx_unlock(&isa_dma_lock); 16345720Speter 16445720Speter return (0); 16545720Speter} 16645720Speter 16745720Speter/* 16845720Speter * Unregister a DMA channel's usage. Usually called from a device driver 16945720Speter * during close() or during its shutdown. 17045720Speter */ 17145720Spetervoid 172332304Semasteisa_dma_release(int chan) 17345720Speter{ 17445720Speter#ifdef DIAGNOSTIC 17545720Speter if (chan & ~VALID_DMA_MASK) 17645720Speter panic("isa_dma_release: channel out of range"); 17745720Speter 178199104Srdivacky mtx_lock(&isa_dma_lock); 17945720Speter if ((dma_inuse & (1 << chan)) == 0) 18045720Speter printf("isa_dma_release: channel %d not in use\n", chan); 181199104Srdivacky#else 182199104Srdivacky mtx_lock(&isa_dma_lock); 18345720Speter#endif 18445720Speter 18545720Speter if (dma_busy & (1 << chan)) { 18645720Speter dma_busy &= ~(1 << chan); 18745720Speter /* 18845720Speter * XXX We should also do "dma_bounced &= (1 << chan);" 18945720Speter * because we are acting on behalf of isa_dmadone() which 19045720Speter * was not called to end the last DMA operation. This does 19145720Speter * not matter now, but it may in the future. 19245720Speter */ 19345720Speter } 19445720Speter 19545720Speter dma_inuse &= ~(1 << chan); 19645720Speter dma_auto_mode &= ~(1 << chan); 197199104Srdivacky 198199104Srdivacky mtx_unlock(&isa_dma_lock); 19945720Speter} 20045720Speter 20145720Speter/* 20245720Speter * isa_dmacascade(): program 8237 DMA controller channel to accept 20345720Speter * external dma control by a board. 20445720Speter */ 20545720Spetervoid 206332304Semasteisa_dmacascade(int chan) 20745720Speter{ 20845720Speter#ifdef DIAGNOSTIC 20945720Speter if (chan & ~VALID_DMA_MASK) 21045720Speter panic("isa_dmacascade: channel out of range"); 21145720Speter#endif 21245720Speter 213199104Srdivacky mtx_lock(&isa_dma_lock); 21445720Speter /* set dma channel mode, and set dma channel mode */ 21545720Speter if ((chan & 4) == 0) { 21645720Speter outb(DMA1_MODE, DMA37MD_CASCADE | chan); 21745720Speter outb(DMA1_SMSK, chan); 21845720Speter } else { 21945720Speter outb(DMA2_MODE, DMA37MD_CASCADE | (chan & 3)); 22045720Speter outb(DMA2_SMSK, chan & 3); 22145720Speter } 222199104Srdivacky mtx_unlock(&isa_dma_lock); 22345720Speter} 22445720Speter 22545720Speter/* 22645720Speter * isa_dmastart(): program 8237 DMA controller channel, avoid page alignment 22745720Speter * problems by using a bounce buffer. 22845720Speter */ 22945720Spetervoid 23045720Speterisa_dmastart(int flags, caddr_t addr, u_int nbytes, int chan) 23145720Speter{ 232112569Sjake vm_paddr_t phys; 23345720Speter int waport; 23445720Speter caddr_t newaddr; 235199104Srdivacky int dma_range_checked; 23645720Speter 237199104Srdivacky dma_range_checked = isa_dmarangecheck(addr, nbytes, chan); 23879224Sdillon 23945720Speter#ifdef DIAGNOSTIC 24045720Speter if (chan & ~VALID_DMA_MASK) 24145720Speter panic("isa_dmastart: channel out of range"); 24245720Speter 24345720Speter if ((chan < 4 && nbytes > (1<<16)) 244204309Sattilio || (chan >= 4 && (nbytes > (1<<17) || (uintptr_t)addr & 1))) 24545720Speter panic("isa_dmastart: impossible request"); 24645720Speter 247199104Srdivacky mtx_lock(&isa_dma_lock); 24845720Speter if ((dma_inuse & (1 << chan)) == 0) 24945720Speter printf("isa_dmastart: channel %d not acquired\n", chan); 250199104Srdivacky#else 251199104Srdivacky mtx_lock(&isa_dma_lock); 25245720Speter#endif 25345720Speter 25445720Speter#if 0 25545720Speter /* 25645720Speter * XXX This should be checked, but drivers like ad1848 only call 25745720Speter * isa_dmastart() once because they use Auto DMA mode. If we 25845720Speter * leave this in, drivers that do this will print this continuously. 25945720Speter */ 26045720Speter if (dma_busy & (1 << chan)) 26145720Speter printf("isa_dmastart: channel %d busy\n", chan); 26245720Speter#endif 26345720Speter 26445720Speter dma_busy |= (1 << chan); 26545720Speter 266199104Srdivacky if (dma_range_checked) { 26745720Speter if (dma_bouncebuf[chan] == NULL 26845720Speter || dma_bouncebufsize[chan] < nbytes) 26945720Speter panic("isa_dmastart: bad bounce buffer"); 27045720Speter dma_bounced |= (1 << chan); 27145720Speter newaddr = dma_bouncebuf[chan]; 27245720Speter 27345720Speter /* copy bounce buffer on write */ 27457973Sphk if (!(flags & ISADMA_READ)) 27545720Speter bcopy(addr, newaddr, nbytes); 27645720Speter addr = newaddr; 27745720Speter } 27845720Speter 279233675Sjhb /* translate to physical */ 280233675Sjhb phys = pmap_extract(kernel_pmap, (vm_offset_t)addr); 281233675Sjhb 28257973Sphk if (flags & ISADMA_RAW) { 28345720Speter dma_auto_mode |= (1 << chan); 28445720Speter } else { 28545720Speter dma_auto_mode &= ~(1 << chan); 28645720Speter } 28745720Speter 28845720Speter if ((chan & 4) == 0) { 28945720Speter /* 29045720Speter * Program one of DMA channels 0..3. These are 29145720Speter * byte mode channels. 29245720Speter */ 29345720Speter /* set dma channel mode, and reset address ff */ 29445720Speter 29557973Sphk /* If ISADMA_RAW flag is set, then use autoinitialise mode */ 29657973Sphk if (flags & ISADMA_RAW) { 29757973Sphk if (flags & ISADMA_READ) 29845720Speter outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_WRITE|chan); 29945720Speter else 30045720Speter outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_READ|chan); 30145720Speter } 30245720Speter else 30357973Sphk if (flags & ISADMA_READ) 30445720Speter outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|chan); 30545720Speter else 30645720Speter outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_READ|chan); 30745720Speter outb(DMA1_FFC, 0); 30845720Speter 30945720Speter /* send start address */ 31045720Speter waport = DMA1_CHN(chan); 31145720Speter outb(waport, phys); 31245720Speter outb(waport, phys>>8); 31345720Speter outb(dmapageport[chan], phys>>16); 31445720Speter 31545720Speter /* send count */ 31645720Speter outb(waport + 1, --nbytes); 31745720Speter outb(waport + 1, nbytes>>8); 31845720Speter 31945720Speter /* unmask channel */ 32045720Speter outb(DMA1_SMSK, chan); 32145720Speter } else { 32245720Speter /* 32345720Speter * Program one of DMA channels 4..7. These are 32445720Speter * word mode channels. 32545720Speter */ 32645720Speter /* set dma channel mode, and reset address ff */ 32745720Speter 32857973Sphk /* If ISADMA_RAW flag is set, then use autoinitialise mode */ 32957973Sphk if (flags & ISADMA_RAW) { 33057973Sphk if (flags & ISADMA_READ) 33145720Speter outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_WRITE|(chan&3)); 33245720Speter else 33345720Speter outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_READ|(chan&3)); 33445720Speter } 33545720Speter else 33657973Sphk if (flags & ISADMA_READ) 33745720Speter outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|(chan&3)); 33845720Speter else 33945720Speter outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_READ|(chan&3)); 34045720Speter outb(DMA2_FFC, 0); 34145720Speter 34245720Speter /* send start address */ 34345720Speter waport = DMA2_CHN(chan - 4); 34445720Speter outb(waport, phys>>1); 34545720Speter outb(waport, phys>>9); 34645720Speter outb(dmapageport[chan], phys>>16); 34745720Speter 34845720Speter /* send count */ 34945720Speter nbytes >>= 1; 35045720Speter outb(waport + 2, --nbytes); 35145720Speter outb(waport + 2, nbytes>>8); 35245720Speter 35345720Speter /* unmask channel */ 35445720Speter outb(DMA2_SMSK, chan & 3); 35545720Speter } 356199104Srdivacky mtx_unlock(&isa_dma_lock); 35745720Speter} 35845720Speter 35945720Spetervoid 36045720Speterisa_dmadone(int flags, caddr_t addr, int nbytes, int chan) 36145720Speter{ 36245720Speter#ifdef DIAGNOSTIC 36345720Speter if (chan & ~VALID_DMA_MASK) 36445720Speter panic("isa_dmadone: channel out of range"); 36545720Speter 36645720Speter if ((dma_inuse & (1 << chan)) == 0) 36745720Speter printf("isa_dmadone: channel %d not acquired\n", chan); 36845720Speter#endif 36945720Speter 370199104Srdivacky mtx_lock(&isa_dma_lock); 37145720Speter if (((dma_busy & (1 << chan)) == 0) && 37245720Speter (dma_auto_mode & (1 << chan)) == 0 ) 37345720Speter printf("isa_dmadone: channel %d not busy\n", chan); 37445720Speter 37545720Speter if ((dma_auto_mode & (1 << chan)) == 0) 37645720Speter outb(chan & 4 ? DMA2_SMSK : DMA1_SMSK, (chan & 3) | 4); 37745720Speter 37845720Speter if (dma_bounced & (1 << chan)) { 37945720Speter /* copy bounce buffer on read */ 38057973Sphk if (flags & ISADMA_READ) 38145720Speter bcopy(dma_bouncebuf[chan], addr, nbytes); 38245720Speter 38345720Speter dma_bounced &= ~(1 << chan); 38445720Speter } 38545720Speter dma_busy &= ~(1 << chan); 386199104Srdivacky mtx_unlock(&isa_dma_lock); 38745720Speter} 38845720Speter 38945720Speter/* 39045720Speter * Check for problems with the address range of a DMA transfer 39145720Speter * (non-contiguous physical pages, outside of bus address space, 39245720Speter * crossing DMA page boundaries). 39345720Speter * Return true if special handling needed. 39445720Speter */ 39545720Speter 39645720Speterstatic int 39745720Speterisa_dmarangecheck(caddr_t va, u_int length, int chan) 39845720Speter{ 399112569Sjake vm_paddr_t phys, priorpage = 0; 400112569Sjake vm_offset_t endva; 40145720Speter u_int dma_pgmsk = (chan & 4) ? ~(128*1024-1) : ~(64*1024-1); 40245720Speter 40345720Speter endva = (vm_offset_t)round_page((vm_offset_t)va + length); 40445720Speter for (; va < (caddr_t) endva ; va += PAGE_SIZE) { 40595710Speter phys = trunc_page(pmap_extract(kernel_pmap, (vm_offset_t)va)); 40645720Speter if (phys == 0) 40745720Speter panic("isa_dmacheck: no physical page present"); 40845720Speter if (phys >= ISARAM_END) 40945720Speter return (1); 41045720Speter if (priorpage) { 41145720Speter if (priorpage + PAGE_SIZE != phys) 41245720Speter return (1); 41345720Speter /* check if crossing a DMA page boundary */ 41445720Speter if (((u_int)priorpage ^ (u_int)phys) & dma_pgmsk) 41545720Speter return (1); 41645720Speter } 41745720Speter priorpage = phys; 41845720Speter } 41945720Speter return (0); 42045720Speter} 42145720Speter 42245720Speter/* 42345720Speter * Query the progress of a transfer on a DMA channel. 42445720Speter * 42545720Speter * To avoid having to interrupt a transfer in progress, we sample 42645720Speter * each of the high and low databytes twice, and apply the following 42745720Speter * logic to determine the correct count. 42845720Speter * 42945720Speter * Reads are performed with interrupts disabled, thus it is to be 43045720Speter * expected that the time between reads is very small. At most 43145720Speter * one rollover in the low count byte can be expected within the 43245720Speter * four reads that are performed. 43345720Speter * 43445720Speter * There are three gaps in which a rollover can occur : 43545720Speter * 43645720Speter * - read low1 43745720Speter * gap1 43845720Speter * - read high1 43945720Speter * gap2 44045720Speter * - read low2 44145720Speter * gap3 44245720Speter * - read high2 44345720Speter * 44445720Speter * If a rollover occurs in gap1 or gap2, the low2 value will be 44545720Speter * greater than the low1 value. In this case, low2 and high2 are a 44645720Speter * corresponding pair. 44745720Speter * 44845720Speter * In any other case, low1 and high1 can be considered to be correct. 44945720Speter * 45045720Speter * The function returns the number of bytes remaining in the transfer, 45145720Speter * or -1 if the channel requested is not active. 45245720Speter * 45345720Speter */ 454199104Srdivackystatic int 455199104Srdivackyisa_dmastatus_locked(int chan) 45645720Speter{ 45745720Speter u_long cnt = 0; 45845720Speter int ffport, waport; 45945720Speter u_long low1, high1, low2, high2; 46045720Speter 461199104Srdivacky mtx_assert(&isa_dma_lock, MA_OWNED); 462199104Srdivacky 46345720Speter /* channel active? */ 46445720Speter if ((dma_inuse & (1 << chan)) == 0) { 46545720Speter printf("isa_dmastatus: channel %d not active\n", chan); 46645720Speter return(-1); 46745720Speter } 46845720Speter /* channel busy? */ 46945720Speter 47045720Speter if (((dma_busy & (1 << chan)) == 0) && 47145720Speter (dma_auto_mode & (1 << chan)) == 0 ) { 47245720Speter printf("chan %d not busy\n", chan); 47345720Speter return -2 ; 47445720Speter } 47545720Speter if (chan < 4) { /* low DMA controller */ 47645720Speter ffport = DMA1_FFC; 47745720Speter waport = DMA1_CHN(chan) + 1; 47845720Speter } else { /* high DMA controller */ 47945720Speter ffport = DMA2_FFC; 48045720Speter waport = DMA2_CHN(chan - 4) + 2; 48145720Speter } 48245720Speter 48345720Speter disable_intr(); /* no interrupts Mr Jones! */ 48445720Speter outb(ffport, 0); /* clear register LSB flipflop */ 48545720Speter low1 = inb(waport); 48645720Speter high1 = inb(waport); 48745720Speter outb(ffport, 0); /* clear again */ 48845720Speter low2 = inb(waport); 48945720Speter high2 = inb(waport); 49045720Speter enable_intr(); /* enable interrupts again */ 49145720Speter 49245720Speter /* 49345720Speter * Now decide if a wrap has tried to skew our results. 49445720Speter * Note that after TC, the count will read 0xffff, while we want 49545720Speter * to return zero, so we add and then mask to compensate. 49645720Speter */ 49745720Speter if (low1 >= low2) { 49845720Speter cnt = (low1 + (high1 << 8) + 1) & 0xffff; 49945720Speter } else { 50045720Speter cnt = (low2 + (high2 << 8) + 1) & 0xffff; 50145720Speter } 50245720Speter 50345720Speter if (chan >= 4) /* high channels move words */ 50445720Speter cnt *= 2; 50545720Speter return(cnt); 50645720Speter} 50745720Speter 508199104Srdivackyint 509199104Srdivackyisa_dmastatus(int chan) 510199104Srdivacky{ 511199104Srdivacky int status; 512199104Srdivacky 513199104Srdivacky mtx_lock(&isa_dma_lock); 514199104Srdivacky status = isa_dmastatus_locked(chan); 515199104Srdivacky mtx_unlock(&isa_dma_lock); 516199104Srdivacky 517199104Srdivacky return (status); 518199104Srdivacky} 519199104Srdivacky 52045720Speter/* 521141391Sphk * Reached terminal count yet ? 522141391Sphk */ 523141391Sphkint 524141391Sphkisa_dmatc(int chan) 525141391Sphk{ 526141391Sphk 527141391Sphk if (chan < 4) 528141391Sphk return(inb(DMA1_STATUS) & (1 << chan)); 529141391Sphk else 530141391Sphk return(inb(DMA2_STATUS) & (1 << (chan & 3))); 531141391Sphk} 532141391Sphk 533141391Sphk/* 53445720Speter * Stop a DMA transfer currently in progress. 53545720Speter */ 53645720Speterint 53745720Speterisa_dmastop(int chan) 53845720Speter{ 539199104Srdivacky int status; 540199104Srdivacky 541199104Srdivacky mtx_lock(&isa_dma_lock); 54245720Speter if ((dma_inuse & (1 << chan)) == 0) 54345720Speter printf("isa_dmastop: channel %d not acquired\n", chan); 54445720Speter 54545720Speter if (((dma_busy & (1 << chan)) == 0) && 54645720Speter ((dma_auto_mode & (1 << chan)) == 0)) { 54745720Speter printf("chan %d not busy\n", chan); 548199104Srdivacky mtx_unlock(&isa_dma_lock); 54945720Speter return -2 ; 55045720Speter } 55145720Speter 55245720Speter if ((chan & 4) == 0) { 55345720Speter outb(DMA1_SMSK, (chan & 3) | 4 /* disable mask */); 55445720Speter } else { 55545720Speter outb(DMA2_SMSK, (chan & 3) | 4 /* disable mask */); 55645720Speter } 557199104Srdivacky 558199104Srdivacky status = isa_dmastatus_locked(chan); 559199104Srdivacky 560199104Srdivacky mtx_unlock(&isa_dma_lock); 561199104Srdivacky 562199104Srdivacky return (status); 56345720Speter} 56461994Smsmith 56561994Smsmith/* 56661994Smsmith * Attach to the ISA PnP descriptor for the AT DMA controller 56761994Smsmith */ 56861994Smsmithstatic struct isa_pnp_id atdma_ids[] = { 56961994Smsmith { 0x0002d041 /* PNP0200 */, "AT DMA controller" }, 57061994Smsmith { 0 } 57161994Smsmith}; 57261994Smsmith 57361994Smsmithstatic int 57461994Smsmithatdma_probe(device_t dev) 57561994Smsmith{ 57661994Smsmith int result; 57761994Smsmith 57861994Smsmith if ((result = ISA_PNP_PROBE(device_get_parent(dev), dev, atdma_ids)) <= 0) 57961994Smsmith device_quiet(dev); 58061994Smsmith return(result); 58161994Smsmith} 58261994Smsmith 58361994Smsmithstatic int 58461994Smsmithatdma_attach(device_t dev) 58561994Smsmith{ 58661994Smsmith return(0); 58761994Smsmith} 58861994Smsmith 58961994Smsmithstatic device_method_t atdma_methods[] = { 59061994Smsmith /* Device interface */ 59161994Smsmith DEVMETHOD(device_probe, atdma_probe), 59261994Smsmith DEVMETHOD(device_attach, atdma_attach), 59361994Smsmith DEVMETHOD(device_detach, bus_generic_detach), 59461994Smsmith DEVMETHOD(device_shutdown, bus_generic_shutdown), 59561994Smsmith DEVMETHOD(device_suspend, bus_generic_suspend), 59661994Smsmith DEVMETHOD(device_resume, bus_generic_resume), 59761994Smsmith { 0, 0 } 59861994Smsmith}; 59961994Smsmith 60061994Smsmithstatic driver_t atdma_driver = { 60161994Smsmith "atdma", 60261994Smsmith atdma_methods, 60361994Smsmith 1, /* no softc */ 60461994Smsmith}; 60561994Smsmith 60661994Smsmithstatic devclass_t atdma_devclass; 60761994Smsmith 60861994SmsmithDRIVER_MODULE(atdma, isa, atdma_driver, atdma_devclass, 0, 0); 60982555SmsmithDRIVER_MODULE(atdma, acpi, atdma_driver, atdma_devclass, 0, 0); 610