isa_dma.c revision 77081
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 * 3. All advertising materials mentioning features or use of this software 1745720Speter * must display the following acknowledgement: 1845720Speter * This product includes software developed by the University of 1945720Speter * California, Berkeley and its contributors. 2045720Speter * 4. Neither the name of the University nor the names of its contributors 2145720Speter * may be used to endorse or promote products derived from this software 2245720Speter * without specific prior written permission. 2345720Speter * 2445720Speter * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2545720Speter * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2645720Speter * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2745720Speter * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2845720Speter * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2945720Speter * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 3045720Speter * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 3145720Speter * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3245720Speter * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3345720Speter * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3445720Speter * SUCH DAMAGE. 3545720Speter * 3645720Speter * from: @(#)isa.c 7.2 (Berkeley) 5/13/91 3750477Speter * $FreeBSD: head/sys/i386/isa/isa_dma.c 77081 2001-05-23 22:13:58Z alfred $ 3845720Speter */ 3945720Speter 4045720Speter/* 4145720Speter * code to manage AT bus 4245720Speter * 4345720Speter * 92/08/18 Frank P. MacLachlan (fpm@crash.cts.com): 4445720Speter * Fixed uninitialized variable problem and added code to deal 4545720Speter * with DMA page boundaries in isa_dmarangecheck(). Fixed word 4645720Speter * mode DMA count compution and reorganized DMA setup code in 4745720Speter * isa_dmastart() 4845720Speter */ 4945720Speter 5045720Speter#include <sys/param.h> 5145720Speter#include <sys/systm.h> 5261994Smsmith#include <sys/bus.h> 5361994Smsmith#include <sys/kernel.h> 5445720Speter#include <sys/malloc.h> 5577081Salfred#include <sys/lock.h> 5677081Salfred#include <sys/mutex.h> 5761994Smsmith#include <sys/module.h> 5845720Speter#include <vm/vm.h> 5945720Speter#include <vm/vm_param.h> 6045720Speter#include <vm/pmap.h> 6145720Speter#include <i386/isa/isa.h> 6245720Speter#include <i386/isa/ic/i8237.h> 6361994Smsmith#include <isa/isavar.h> 6445720Speter 6545720Speter/* 6645720Speter** Register definitions for DMA controller 1 (channels 0..3): 6745720Speter*/ 6845720Speter#define DMA1_CHN(c) (IO_DMA1 + 1*(2*(c))) /* addr reg for channel c */ 6945720Speter#define DMA1_SMSK (IO_DMA1 + 1*10) /* single mask register */ 7045720Speter#define DMA1_MODE (IO_DMA1 + 1*11) /* mode register */ 7145720Speter#define DMA1_FFC (IO_DMA1 + 1*12) /* clear first/last FF */ 7245720Speter 7345720Speter/* 7445720Speter** Register definitions for DMA controller 2 (channels 4..7): 7545720Speter*/ 7645720Speter#define DMA2_CHN(c) (IO_DMA2 + 2*(2*(c))) /* addr reg for channel c */ 7745720Speter#define DMA2_SMSK (IO_DMA2 + 2*10) /* single mask register */ 7845720Speter#define DMA2_MODE (IO_DMA2 + 2*11) /* mode register */ 7945720Speter#define DMA2_FFC (IO_DMA2 + 2*12) /* clear first/last FF */ 8045720Speter 8145720Speterstatic int isa_dmarangecheck __P((caddr_t va, u_int length, int chan)); 8245720Speter 8345720Speterstatic caddr_t dma_bouncebuf[8]; 8445720Speterstatic u_int dma_bouncebufsize[8]; 8545720Speterstatic u_int8_t dma_bounced = 0; 8645720Speterstatic u_int8_t dma_busy = 0; /* Used in isa_dmastart() */ 8745720Speterstatic u_int8_t dma_inuse = 0; /* User for acquire/release */ 8845720Speterstatic u_int8_t dma_auto_mode = 0; 8945720Speter 9045720Speter#define VALID_DMA_MASK (7) 9145720Speter 9245720Speter/* high byte of address is stored in this port for i-th dma channel */ 9345720Speterstatic int dmapageport[8] = { 0x87, 0x83, 0x81, 0x82, 0x8f, 0x8b, 0x89, 0x8a }; 9445720Speter 9545720Speter/* 9645720Speter * Setup a DMA channel's bounce buffer. 9745720Speter */ 9845720Spetervoid 9945720Speterisa_dmainit(chan, bouncebufsize) 10045720Speter int chan; 10145720Speter u_int bouncebufsize; 10245720Speter{ 10345720Speter void *buf; 10445720Speter 10545720Speter#ifdef DIAGNOSTIC 10645720Speter if (chan & ~VALID_DMA_MASK) 10745720Speter panic("isa_dmainit: channel out of range"); 10845720Speter 10945720Speter if (dma_bouncebuf[chan] != NULL) 11045720Speter panic("isa_dmainit: impossible request"); 11145720Speter#endif 11245720Speter 11345720Speter dma_bouncebufsize[chan] = bouncebufsize; 11445720Speter 11545720Speter /* Try malloc() first. It works better if it works. */ 11645720Speter buf = malloc(bouncebufsize, M_DEVBUF, M_NOWAIT); 11745720Speter if (buf != NULL) { 11845720Speter if (isa_dmarangecheck(buf, bouncebufsize, chan) == 0) { 11945720Speter dma_bouncebuf[chan] = buf; 12045720Speter return; 12145720Speter } 12245720Speter free(buf, M_DEVBUF); 12345720Speter } 12445720Speter buf = contigmalloc(bouncebufsize, M_DEVBUF, M_NOWAIT, 0ul, 0xfffffful, 12545720Speter 1ul, chan & 4 ? 0x20000ul : 0x10000ul); 12645720Speter if (buf == NULL) 12745720Speter printf("isa_dmainit(%d, %d) failed\n", chan, bouncebufsize); 12845720Speter else 12945720Speter dma_bouncebuf[chan] = buf; 13045720Speter} 13145720Speter 13245720Speter/* 13345720Speter * Register a DMA channel's usage. Usually called from a device driver 13445720Speter * in open() or during its initialization. 13545720Speter */ 13645720Speterint 13745720Speterisa_dma_acquire(chan) 13845720Speter int chan; 13945720Speter{ 14045720Speter#ifdef DIAGNOSTIC 14145720Speter if (chan & ~VALID_DMA_MASK) 14245720Speter panic("isa_dma_acquire: channel out of range"); 14345720Speter#endif 14445720Speter 14545720Speter if (dma_inuse & (1 << chan)) { 14645720Speter printf("isa_dma_acquire: channel %d already in use\n", chan); 14745720Speter return (EBUSY); 14845720Speter } 14945720Speter dma_inuse |= (1 << chan); 15045720Speter dma_auto_mode &= ~(1 << chan); 15145720Speter 15245720Speter return (0); 15345720Speter} 15445720Speter 15545720Speter/* 15645720Speter * Unregister a DMA channel's usage. Usually called from a device driver 15745720Speter * during close() or during its shutdown. 15845720Speter */ 15945720Spetervoid 16045720Speterisa_dma_release(chan) 16145720Speter int chan; 16245720Speter{ 16345720Speter#ifdef DIAGNOSTIC 16445720Speter if (chan & ~VALID_DMA_MASK) 16545720Speter panic("isa_dma_release: channel out of range"); 16645720Speter 16745720Speter if ((dma_inuse & (1 << chan)) == 0) 16845720Speter printf("isa_dma_release: channel %d not in use\n", chan); 16945720Speter#endif 17045720Speter 17145720Speter if (dma_busy & (1 << chan)) { 17245720Speter dma_busy &= ~(1 << chan); 17345720Speter /* 17445720Speter * XXX We should also do "dma_bounced &= (1 << chan);" 17545720Speter * because we are acting on behalf of isa_dmadone() which 17645720Speter * was not called to end the last DMA operation. This does 17745720Speter * not matter now, but it may in the future. 17845720Speter */ 17945720Speter } 18045720Speter 18145720Speter dma_inuse &= ~(1 << chan); 18245720Speter dma_auto_mode &= ~(1 << chan); 18345720Speter} 18445720Speter 18545720Speter/* 18645720Speter * isa_dmacascade(): program 8237 DMA controller channel to accept 18745720Speter * external dma control by a board. 18845720Speter */ 18945720Spetervoid 19045720Speterisa_dmacascade(chan) 19145720Speter int chan; 19245720Speter{ 19345720Speter#ifdef DIAGNOSTIC 19445720Speter if (chan & ~VALID_DMA_MASK) 19545720Speter panic("isa_dmacascade: channel out of range"); 19645720Speter#endif 19745720Speter 19845720Speter /* set dma channel mode, and set dma channel mode */ 19945720Speter if ((chan & 4) == 0) { 20045720Speter outb(DMA1_MODE, DMA37MD_CASCADE | chan); 20145720Speter outb(DMA1_SMSK, chan); 20245720Speter } else { 20345720Speter outb(DMA2_MODE, DMA37MD_CASCADE | (chan & 3)); 20445720Speter outb(DMA2_SMSK, chan & 3); 20545720Speter } 20645720Speter} 20745720Speter 20845720Speter/* 20945720Speter * isa_dmastart(): program 8237 DMA controller channel, avoid page alignment 21045720Speter * problems by using a bounce buffer. 21145720Speter */ 21245720Spetervoid 21345720Speterisa_dmastart(int flags, caddr_t addr, u_int nbytes, int chan) 21445720Speter{ 21545720Speter vm_offset_t phys; 21645720Speter int waport; 21745720Speter caddr_t newaddr; 21845720Speter 21945720Speter#ifdef DIAGNOSTIC 22045720Speter if (chan & ~VALID_DMA_MASK) 22145720Speter panic("isa_dmastart: channel out of range"); 22245720Speter 22345720Speter if ((chan < 4 && nbytes > (1<<16)) 22445720Speter || (chan >= 4 && (nbytes > (1<<17) || (u_int)addr & 1))) 22545720Speter panic("isa_dmastart: impossible request"); 22645720Speter 22745720Speter if ((dma_inuse & (1 << chan)) == 0) 22845720Speter printf("isa_dmastart: channel %d not acquired\n", chan); 22945720Speter#endif 23045720Speter 23145720Speter#if 0 23245720Speter /* 23345720Speter * XXX This should be checked, but drivers like ad1848 only call 23445720Speter * isa_dmastart() once because they use Auto DMA mode. If we 23545720Speter * leave this in, drivers that do this will print this continuously. 23645720Speter */ 23745720Speter if (dma_busy & (1 << chan)) 23845720Speter printf("isa_dmastart: channel %d busy\n", chan); 23945720Speter#endif 24045720Speter 24145720Speter dma_busy |= (1 << chan); 24245720Speter 24345720Speter if (isa_dmarangecheck(addr, nbytes, chan)) { 24445720Speter if (dma_bouncebuf[chan] == NULL 24545720Speter || dma_bouncebufsize[chan] < nbytes) 24645720Speter panic("isa_dmastart: bad bounce buffer"); 24745720Speter dma_bounced |= (1 << chan); 24845720Speter newaddr = dma_bouncebuf[chan]; 24945720Speter 25045720Speter /* copy bounce buffer on write */ 25157973Sphk if (!(flags & ISADMA_READ)) 25245720Speter bcopy(addr, newaddr, nbytes); 25345720Speter addr = newaddr; 25445720Speter } 25545720Speter 25645720Speter /* translate to physical */ 25777081Salfred mtx_lock(&vm_mtx); /* 25877081Salfred * XXX: need to hold for longer period to 25977081Salfred * ensure that mappings don't change 26077081Salfred */ 26145720Speter phys = pmap_extract(pmap_kernel(), (vm_offset_t)addr); 26277081Salfred mtx_unlock(&vm_mtx); 26345720Speter 26457973Sphk if (flags & ISADMA_RAW) { 26545720Speter dma_auto_mode |= (1 << chan); 26645720Speter } else { 26745720Speter dma_auto_mode &= ~(1 << chan); 26845720Speter } 26945720Speter 27045720Speter if ((chan & 4) == 0) { 27145720Speter /* 27245720Speter * Program one of DMA channels 0..3. These are 27345720Speter * byte mode channels. 27445720Speter */ 27545720Speter /* set dma channel mode, and reset address ff */ 27645720Speter 27757973Sphk /* If ISADMA_RAW flag is set, then use autoinitialise mode */ 27857973Sphk if (flags & ISADMA_RAW) { 27957973Sphk if (flags & ISADMA_READ) 28045720Speter outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_WRITE|chan); 28145720Speter else 28245720Speter outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_READ|chan); 28345720Speter } 28445720Speter else 28557973Sphk if (flags & ISADMA_READ) 28645720Speter outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|chan); 28745720Speter else 28845720Speter outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_READ|chan); 28945720Speter outb(DMA1_FFC, 0); 29045720Speter 29145720Speter /* send start address */ 29245720Speter waport = DMA1_CHN(chan); 29345720Speter outb(waport, phys); 29445720Speter outb(waport, phys>>8); 29545720Speter outb(dmapageport[chan], phys>>16); 29645720Speter 29745720Speter /* send count */ 29845720Speter outb(waport + 1, --nbytes); 29945720Speter outb(waport + 1, nbytes>>8); 30045720Speter 30145720Speter /* unmask channel */ 30245720Speter outb(DMA1_SMSK, chan); 30345720Speter } else { 30445720Speter /* 30545720Speter * Program one of DMA channels 4..7. These are 30645720Speter * word mode channels. 30745720Speter */ 30845720Speter /* set dma channel mode, and reset address ff */ 30945720Speter 31057973Sphk /* If ISADMA_RAW flag is set, then use autoinitialise mode */ 31157973Sphk if (flags & ISADMA_RAW) { 31257973Sphk if (flags & ISADMA_READ) 31345720Speter outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_WRITE|(chan&3)); 31445720Speter else 31545720Speter outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_READ|(chan&3)); 31645720Speter } 31745720Speter else 31857973Sphk if (flags & ISADMA_READ) 31945720Speter outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|(chan&3)); 32045720Speter else 32145720Speter outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_READ|(chan&3)); 32245720Speter outb(DMA2_FFC, 0); 32345720Speter 32445720Speter /* send start address */ 32545720Speter waport = DMA2_CHN(chan - 4); 32645720Speter outb(waport, phys>>1); 32745720Speter outb(waport, phys>>9); 32845720Speter outb(dmapageport[chan], phys>>16); 32945720Speter 33045720Speter /* send count */ 33145720Speter nbytes >>= 1; 33245720Speter outb(waport + 2, --nbytes); 33345720Speter outb(waport + 2, nbytes>>8); 33445720Speter 33545720Speter /* unmask channel */ 33645720Speter outb(DMA2_SMSK, chan & 3); 33745720Speter } 33845720Speter} 33945720Speter 34045720Spetervoid 34145720Speterisa_dmadone(int flags, caddr_t addr, int nbytes, int chan) 34245720Speter{ 34345720Speter#ifdef DIAGNOSTIC 34445720Speter if (chan & ~VALID_DMA_MASK) 34545720Speter panic("isa_dmadone: channel out of range"); 34645720Speter 34745720Speter if ((dma_inuse & (1 << chan)) == 0) 34845720Speter printf("isa_dmadone: channel %d not acquired\n", chan); 34945720Speter#endif 35045720Speter 35145720Speter if (((dma_busy & (1 << chan)) == 0) && 35245720Speter (dma_auto_mode & (1 << chan)) == 0 ) 35345720Speter printf("isa_dmadone: channel %d not busy\n", chan); 35445720Speter 35545720Speter if ((dma_auto_mode & (1 << chan)) == 0) 35645720Speter outb(chan & 4 ? DMA2_SMSK : DMA1_SMSK, (chan & 3) | 4); 35745720Speter 35845720Speter if (dma_bounced & (1 << chan)) { 35945720Speter /* copy bounce buffer on read */ 36057973Sphk if (flags & ISADMA_READ) 36145720Speter bcopy(dma_bouncebuf[chan], addr, nbytes); 36245720Speter 36345720Speter dma_bounced &= ~(1 << chan); 36445720Speter } 36545720Speter dma_busy &= ~(1 << chan); 36645720Speter} 36745720Speter 36845720Speter/* 36945720Speter * Check for problems with the address range of a DMA transfer 37045720Speter * (non-contiguous physical pages, outside of bus address space, 37145720Speter * crossing DMA page boundaries). 37245720Speter * Return true if special handling needed. 37345720Speter */ 37445720Speter 37545720Speterstatic int 37645720Speterisa_dmarangecheck(caddr_t va, u_int length, int chan) 37745720Speter{ 37845720Speter vm_offset_t phys, priorpage = 0, endva; 37945720Speter u_int dma_pgmsk = (chan & 4) ? ~(128*1024-1) : ~(64*1024-1); 38045720Speter 38145720Speter endva = (vm_offset_t)round_page((vm_offset_t)va + length); 38245720Speter for (; va < (caddr_t) endva ; va += PAGE_SIZE) { 38377081Salfred mtx_lock(&vm_mtx); 38445720Speter phys = trunc_page(pmap_extract(pmap_kernel(), (vm_offset_t)va)); 38577081Salfred mtx_unlock(&vm_mtx); 38645720Speter#define ISARAM_END RAM_END 38745720Speter if (phys == 0) 38845720Speter panic("isa_dmacheck: no physical page present"); 38945720Speter if (phys >= ISARAM_END) 39045720Speter return (1); 39145720Speter if (priorpage) { 39245720Speter if (priorpage + PAGE_SIZE != phys) 39345720Speter return (1); 39445720Speter /* check if crossing a DMA page boundary */ 39545720Speter if (((u_int)priorpage ^ (u_int)phys) & dma_pgmsk) 39645720Speter return (1); 39745720Speter } 39845720Speter priorpage = phys; 39945720Speter } 40045720Speter return (0); 40145720Speter} 40245720Speter 40345720Speter/* 40445720Speter * Query the progress of a transfer on a DMA channel. 40545720Speter * 40645720Speter * To avoid having to interrupt a transfer in progress, we sample 40745720Speter * each of the high and low databytes twice, and apply the following 40845720Speter * logic to determine the correct count. 40945720Speter * 41045720Speter * Reads are performed with interrupts disabled, thus it is to be 41145720Speter * expected that the time between reads is very small. At most 41245720Speter * one rollover in the low count byte can be expected within the 41345720Speter * four reads that are performed. 41445720Speter * 41545720Speter * There are three gaps in which a rollover can occur : 41645720Speter * 41745720Speter * - read low1 41845720Speter * gap1 41945720Speter * - read high1 42045720Speter * gap2 42145720Speter * - read low2 42245720Speter * gap3 42345720Speter * - read high2 42445720Speter * 42545720Speter * If a rollover occurs in gap1 or gap2, the low2 value will be 42645720Speter * greater than the low1 value. In this case, low2 and high2 are a 42745720Speter * corresponding pair. 42845720Speter * 42945720Speter * In any other case, low1 and high1 can be considered to be correct. 43045720Speter * 43145720Speter * The function returns the number of bytes remaining in the transfer, 43245720Speter * or -1 if the channel requested is not active. 43345720Speter * 43445720Speter */ 43545720Speterint 43645720Speterisa_dmastatus(int chan) 43745720Speter{ 43845720Speter u_long cnt = 0; 43945720Speter int ffport, waport; 44045720Speter u_long low1, high1, low2, high2; 44145720Speter 44245720Speter /* channel active? */ 44345720Speter if ((dma_inuse & (1 << chan)) == 0) { 44445720Speter printf("isa_dmastatus: channel %d not active\n", chan); 44545720Speter return(-1); 44645720Speter } 44745720Speter /* channel busy? */ 44845720Speter 44945720Speter if (((dma_busy & (1 << chan)) == 0) && 45045720Speter (dma_auto_mode & (1 << chan)) == 0 ) { 45145720Speter printf("chan %d not busy\n", chan); 45245720Speter return -2 ; 45345720Speter } 45445720Speter if (chan < 4) { /* low DMA controller */ 45545720Speter ffport = DMA1_FFC; 45645720Speter waport = DMA1_CHN(chan) + 1; 45745720Speter } else { /* high DMA controller */ 45845720Speter ffport = DMA2_FFC; 45945720Speter waport = DMA2_CHN(chan - 4) + 2; 46045720Speter } 46145720Speter 46245720Speter disable_intr(); /* no interrupts Mr Jones! */ 46345720Speter outb(ffport, 0); /* clear register LSB flipflop */ 46445720Speter low1 = inb(waport); 46545720Speter high1 = inb(waport); 46645720Speter outb(ffport, 0); /* clear again */ 46745720Speter low2 = inb(waport); 46845720Speter high2 = inb(waport); 46945720Speter enable_intr(); /* enable interrupts again */ 47045720Speter 47145720Speter /* 47245720Speter * Now decide if a wrap has tried to skew our results. 47345720Speter * Note that after TC, the count will read 0xffff, while we want 47445720Speter * to return zero, so we add and then mask to compensate. 47545720Speter */ 47645720Speter if (low1 >= low2) { 47745720Speter cnt = (low1 + (high1 << 8) + 1) & 0xffff; 47845720Speter } else { 47945720Speter cnt = (low2 + (high2 << 8) + 1) & 0xffff; 48045720Speter } 48145720Speter 48245720Speter if (chan >= 4) /* high channels move words */ 48345720Speter cnt *= 2; 48445720Speter return(cnt); 48545720Speter} 48645720Speter 48745720Speter/* 48845720Speter * Stop a DMA transfer currently in progress. 48945720Speter */ 49045720Speterint 49145720Speterisa_dmastop(int chan) 49245720Speter{ 49345720Speter if ((dma_inuse & (1 << chan)) == 0) 49445720Speter printf("isa_dmastop: channel %d not acquired\n", chan); 49545720Speter 49645720Speter if (((dma_busy & (1 << chan)) == 0) && 49745720Speter ((dma_auto_mode & (1 << chan)) == 0)) { 49845720Speter printf("chan %d not busy\n", chan); 49945720Speter return -2 ; 50045720Speter } 50145720Speter 50245720Speter if ((chan & 4) == 0) { 50345720Speter outb(DMA1_SMSK, (chan & 3) | 4 /* disable mask */); 50445720Speter } else { 50545720Speter outb(DMA2_SMSK, (chan & 3) | 4 /* disable mask */); 50645720Speter } 50745720Speter return(isa_dmastatus(chan)); 50845720Speter} 50961994Smsmith 51061994Smsmith/* 51161994Smsmith * Attach to the ISA PnP descriptor for the AT DMA controller 51261994Smsmith */ 51361994Smsmithstatic struct isa_pnp_id atdma_ids[] = { 51461994Smsmith { 0x0002d041 /* PNP0200 */, "AT DMA controller" }, 51561994Smsmith { 0 } 51661994Smsmith}; 51761994Smsmith 51861994Smsmithstatic int 51961994Smsmithatdma_probe(device_t dev) 52061994Smsmith{ 52161994Smsmith int result; 52261994Smsmith 52361994Smsmith if ((result = ISA_PNP_PROBE(device_get_parent(dev), dev, atdma_ids)) <= 0) 52461994Smsmith device_quiet(dev); 52561994Smsmith return(result); 52661994Smsmith} 52761994Smsmith 52861994Smsmithstatic int 52961994Smsmithatdma_attach(device_t dev) 53061994Smsmith{ 53161994Smsmith return(0); 53261994Smsmith} 53361994Smsmith 53461994Smsmithstatic device_method_t atdma_methods[] = { 53561994Smsmith /* Device interface */ 53661994Smsmith DEVMETHOD(device_probe, atdma_probe), 53761994Smsmith DEVMETHOD(device_attach, atdma_attach), 53861994Smsmith DEVMETHOD(device_detach, bus_generic_detach), 53961994Smsmith DEVMETHOD(device_shutdown, bus_generic_shutdown), 54061994Smsmith DEVMETHOD(device_suspend, bus_generic_suspend), 54161994Smsmith DEVMETHOD(device_resume, bus_generic_resume), 54261994Smsmith { 0, 0 } 54361994Smsmith}; 54461994Smsmith 54561994Smsmithstatic driver_t atdma_driver = { 54661994Smsmith "atdma", 54761994Smsmith atdma_methods, 54861994Smsmith 1, /* no softc */ 54961994Smsmith}; 55061994Smsmith 55161994Smsmithstatic devclass_t atdma_devclass; 55261994Smsmith 55361994SmsmithDRIVER_MODULE(atdma, isa, atdma_driver, atdma_devclass, 0, 0); 554