isa_dma.c revision 61994
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 61994 2000-06-23 07:44:33Z msmith $ 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> 5561994Smsmith#include <sys/module.h> 5645720Speter#include <vm/vm.h> 5745720Speter#include <vm/vm_param.h> 5845720Speter#include <vm/pmap.h> 5945720Speter#include <i386/isa/isa.h> 6045720Speter#include <i386/isa/ic/i8237.h> 6161994Smsmith#include <isa/isavar.h> 6245720Speter 6345720Speter/* 6445720Speter** Register definitions for DMA controller 1 (channels 0..3): 6545720Speter*/ 6645720Speter#define DMA1_CHN(c) (IO_DMA1 + 1*(2*(c))) /* addr reg for channel c */ 6745720Speter#define DMA1_SMSK (IO_DMA1 + 1*10) /* single mask register */ 6845720Speter#define DMA1_MODE (IO_DMA1 + 1*11) /* mode register */ 6945720Speter#define DMA1_FFC (IO_DMA1 + 1*12) /* clear first/last FF */ 7045720Speter 7145720Speter/* 7245720Speter** Register definitions for DMA controller 2 (channels 4..7): 7345720Speter*/ 7445720Speter#define DMA2_CHN(c) (IO_DMA2 + 2*(2*(c))) /* addr reg for channel c */ 7545720Speter#define DMA2_SMSK (IO_DMA2 + 2*10) /* single mask register */ 7645720Speter#define DMA2_MODE (IO_DMA2 + 2*11) /* mode register */ 7745720Speter#define DMA2_FFC (IO_DMA2 + 2*12) /* clear first/last FF */ 7845720Speter 7945720Speterstatic int isa_dmarangecheck __P((caddr_t va, u_int length, int chan)); 8045720Speter 8145720Speterstatic caddr_t dma_bouncebuf[8]; 8245720Speterstatic u_int dma_bouncebufsize[8]; 8345720Speterstatic u_int8_t dma_bounced = 0; 8445720Speterstatic u_int8_t dma_busy = 0; /* Used in isa_dmastart() */ 8545720Speterstatic u_int8_t dma_inuse = 0; /* User for acquire/release */ 8645720Speterstatic u_int8_t dma_auto_mode = 0; 8745720Speter 8845720Speter#define VALID_DMA_MASK (7) 8945720Speter 9045720Speter/* high byte of address is stored in this port for i-th dma channel */ 9145720Speterstatic int dmapageport[8] = { 0x87, 0x83, 0x81, 0x82, 0x8f, 0x8b, 0x89, 0x8a }; 9245720Speter 9345720Speter/* 9445720Speter * Setup a DMA channel's bounce buffer. 9545720Speter */ 9645720Spetervoid 9745720Speterisa_dmainit(chan, bouncebufsize) 9845720Speter int chan; 9945720Speter u_int bouncebufsize; 10045720Speter{ 10145720Speter void *buf; 10245720Speter 10345720Speter#ifdef DIAGNOSTIC 10445720Speter if (chan & ~VALID_DMA_MASK) 10545720Speter panic("isa_dmainit: channel out of range"); 10645720Speter 10745720Speter if (dma_bouncebuf[chan] != NULL) 10845720Speter panic("isa_dmainit: impossible request"); 10945720Speter#endif 11045720Speter 11145720Speter dma_bouncebufsize[chan] = bouncebufsize; 11245720Speter 11345720Speter /* Try malloc() first. It works better if it works. */ 11445720Speter buf = malloc(bouncebufsize, M_DEVBUF, M_NOWAIT); 11545720Speter if (buf != NULL) { 11645720Speter if (isa_dmarangecheck(buf, bouncebufsize, chan) == 0) { 11745720Speter dma_bouncebuf[chan] = buf; 11845720Speter return; 11945720Speter } 12045720Speter free(buf, M_DEVBUF); 12145720Speter } 12245720Speter buf = contigmalloc(bouncebufsize, M_DEVBUF, M_NOWAIT, 0ul, 0xfffffful, 12345720Speter 1ul, chan & 4 ? 0x20000ul : 0x10000ul); 12445720Speter if (buf == NULL) 12545720Speter printf("isa_dmainit(%d, %d) failed\n", chan, bouncebufsize); 12645720Speter else 12745720Speter dma_bouncebuf[chan] = buf; 12845720Speter} 12945720Speter 13045720Speter/* 13145720Speter * Register a DMA channel's usage. Usually called from a device driver 13245720Speter * in open() or during its initialization. 13345720Speter */ 13445720Speterint 13545720Speterisa_dma_acquire(chan) 13645720Speter int chan; 13745720Speter{ 13845720Speter#ifdef DIAGNOSTIC 13945720Speter if (chan & ~VALID_DMA_MASK) 14045720Speter panic("isa_dma_acquire: channel out of range"); 14145720Speter#endif 14245720Speter 14345720Speter if (dma_inuse & (1 << chan)) { 14445720Speter printf("isa_dma_acquire: channel %d already in use\n", chan); 14545720Speter return (EBUSY); 14645720Speter } 14745720Speter dma_inuse |= (1 << chan); 14845720Speter dma_auto_mode &= ~(1 << chan); 14945720Speter 15045720Speter return (0); 15145720Speter} 15245720Speter 15345720Speter/* 15445720Speter * Unregister a DMA channel's usage. Usually called from a device driver 15545720Speter * during close() or during its shutdown. 15645720Speter */ 15745720Spetervoid 15845720Speterisa_dma_release(chan) 15945720Speter int chan; 16045720Speter{ 16145720Speter#ifdef DIAGNOSTIC 16245720Speter if (chan & ~VALID_DMA_MASK) 16345720Speter panic("isa_dma_release: channel out of range"); 16445720Speter 16545720Speter if ((dma_inuse & (1 << chan)) == 0) 16645720Speter printf("isa_dma_release: channel %d not in use\n", chan); 16745720Speter#endif 16845720Speter 16945720Speter if (dma_busy & (1 << chan)) { 17045720Speter dma_busy &= ~(1 << chan); 17145720Speter /* 17245720Speter * XXX We should also do "dma_bounced &= (1 << chan);" 17345720Speter * because we are acting on behalf of isa_dmadone() which 17445720Speter * was not called to end the last DMA operation. This does 17545720Speter * not matter now, but it may in the future. 17645720Speter */ 17745720Speter } 17845720Speter 17945720Speter dma_inuse &= ~(1 << chan); 18045720Speter dma_auto_mode &= ~(1 << chan); 18145720Speter} 18245720Speter 18345720Speter/* 18445720Speter * isa_dmacascade(): program 8237 DMA controller channel to accept 18545720Speter * external dma control by a board. 18645720Speter */ 18745720Spetervoid 18845720Speterisa_dmacascade(chan) 18945720Speter int chan; 19045720Speter{ 19145720Speter#ifdef DIAGNOSTIC 19245720Speter if (chan & ~VALID_DMA_MASK) 19345720Speter panic("isa_dmacascade: channel out of range"); 19445720Speter#endif 19545720Speter 19645720Speter /* set dma channel mode, and set dma channel mode */ 19745720Speter if ((chan & 4) == 0) { 19845720Speter outb(DMA1_MODE, DMA37MD_CASCADE | chan); 19945720Speter outb(DMA1_SMSK, chan); 20045720Speter } else { 20145720Speter outb(DMA2_MODE, DMA37MD_CASCADE | (chan & 3)); 20245720Speter outb(DMA2_SMSK, chan & 3); 20345720Speter } 20445720Speter} 20545720Speter 20645720Speter/* 20745720Speter * isa_dmastart(): program 8237 DMA controller channel, avoid page alignment 20845720Speter * problems by using a bounce buffer. 20945720Speter */ 21045720Spetervoid 21145720Speterisa_dmastart(int flags, caddr_t addr, u_int nbytes, int chan) 21245720Speter{ 21345720Speter vm_offset_t phys; 21445720Speter int waport; 21545720Speter caddr_t newaddr; 21645720Speter 21745720Speter#ifdef DIAGNOSTIC 21845720Speter if (chan & ~VALID_DMA_MASK) 21945720Speter panic("isa_dmastart: channel out of range"); 22045720Speter 22145720Speter if ((chan < 4 && nbytes > (1<<16)) 22245720Speter || (chan >= 4 && (nbytes > (1<<17) || (u_int)addr & 1))) 22345720Speter panic("isa_dmastart: impossible request"); 22445720Speter 22545720Speter if ((dma_inuse & (1 << chan)) == 0) 22645720Speter printf("isa_dmastart: channel %d not acquired\n", chan); 22745720Speter#endif 22845720Speter 22945720Speter#if 0 23045720Speter /* 23145720Speter * XXX This should be checked, but drivers like ad1848 only call 23245720Speter * isa_dmastart() once because they use Auto DMA mode. If we 23345720Speter * leave this in, drivers that do this will print this continuously. 23445720Speter */ 23545720Speter if (dma_busy & (1 << chan)) 23645720Speter printf("isa_dmastart: channel %d busy\n", chan); 23745720Speter#endif 23845720Speter 23945720Speter dma_busy |= (1 << chan); 24045720Speter 24145720Speter if (isa_dmarangecheck(addr, nbytes, chan)) { 24245720Speter if (dma_bouncebuf[chan] == NULL 24345720Speter || dma_bouncebufsize[chan] < nbytes) 24445720Speter panic("isa_dmastart: bad bounce buffer"); 24545720Speter dma_bounced |= (1 << chan); 24645720Speter newaddr = dma_bouncebuf[chan]; 24745720Speter 24845720Speter /* copy bounce buffer on write */ 24957973Sphk if (!(flags & ISADMA_READ)) 25045720Speter bcopy(addr, newaddr, nbytes); 25145720Speter addr = newaddr; 25245720Speter } 25345720Speter 25445720Speter /* translate to physical */ 25545720Speter phys = pmap_extract(pmap_kernel(), (vm_offset_t)addr); 25645720Speter 25757973Sphk if (flags & ISADMA_RAW) { 25845720Speter dma_auto_mode |= (1 << chan); 25945720Speter } else { 26045720Speter dma_auto_mode &= ~(1 << chan); 26145720Speter } 26245720Speter 26345720Speter if ((chan & 4) == 0) { 26445720Speter /* 26545720Speter * Program one of DMA channels 0..3. These are 26645720Speter * byte mode channels. 26745720Speter */ 26845720Speter /* set dma channel mode, and reset address ff */ 26945720Speter 27057973Sphk /* If ISADMA_RAW flag is set, then use autoinitialise mode */ 27157973Sphk if (flags & ISADMA_RAW) { 27257973Sphk if (flags & ISADMA_READ) 27345720Speter outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_WRITE|chan); 27445720Speter else 27545720Speter outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_READ|chan); 27645720Speter } 27745720Speter else 27857973Sphk if (flags & ISADMA_READ) 27945720Speter outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|chan); 28045720Speter else 28145720Speter outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_READ|chan); 28245720Speter outb(DMA1_FFC, 0); 28345720Speter 28445720Speter /* send start address */ 28545720Speter waport = DMA1_CHN(chan); 28645720Speter outb(waport, phys); 28745720Speter outb(waport, phys>>8); 28845720Speter outb(dmapageport[chan], phys>>16); 28945720Speter 29045720Speter /* send count */ 29145720Speter outb(waport + 1, --nbytes); 29245720Speter outb(waport + 1, nbytes>>8); 29345720Speter 29445720Speter /* unmask channel */ 29545720Speter outb(DMA1_SMSK, chan); 29645720Speter } else { 29745720Speter /* 29845720Speter * Program one of DMA channels 4..7. These are 29945720Speter * word mode channels. 30045720Speter */ 30145720Speter /* set dma channel mode, and reset address ff */ 30245720Speter 30357973Sphk /* If ISADMA_RAW flag is set, then use autoinitialise mode */ 30457973Sphk if (flags & ISADMA_RAW) { 30557973Sphk if (flags & ISADMA_READ) 30645720Speter outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_WRITE|(chan&3)); 30745720Speter else 30845720Speter outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_READ|(chan&3)); 30945720Speter } 31045720Speter else 31157973Sphk if (flags & ISADMA_READ) 31245720Speter outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|(chan&3)); 31345720Speter else 31445720Speter outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_READ|(chan&3)); 31545720Speter outb(DMA2_FFC, 0); 31645720Speter 31745720Speter /* send start address */ 31845720Speter waport = DMA2_CHN(chan - 4); 31945720Speter outb(waport, phys>>1); 32045720Speter outb(waport, phys>>9); 32145720Speter outb(dmapageport[chan], phys>>16); 32245720Speter 32345720Speter /* send count */ 32445720Speter nbytes >>= 1; 32545720Speter outb(waport + 2, --nbytes); 32645720Speter outb(waport + 2, nbytes>>8); 32745720Speter 32845720Speter /* unmask channel */ 32945720Speter outb(DMA2_SMSK, chan & 3); 33045720Speter } 33145720Speter} 33245720Speter 33345720Spetervoid 33445720Speterisa_dmadone(int flags, caddr_t addr, int nbytes, int chan) 33545720Speter{ 33645720Speter#ifdef DIAGNOSTIC 33745720Speter if (chan & ~VALID_DMA_MASK) 33845720Speter panic("isa_dmadone: channel out of range"); 33945720Speter 34045720Speter if ((dma_inuse & (1 << chan)) == 0) 34145720Speter printf("isa_dmadone: channel %d not acquired\n", chan); 34245720Speter#endif 34345720Speter 34445720Speter if (((dma_busy & (1 << chan)) == 0) && 34545720Speter (dma_auto_mode & (1 << chan)) == 0 ) 34645720Speter printf("isa_dmadone: channel %d not busy\n", chan); 34745720Speter 34845720Speter if ((dma_auto_mode & (1 << chan)) == 0) 34945720Speter outb(chan & 4 ? DMA2_SMSK : DMA1_SMSK, (chan & 3) | 4); 35045720Speter 35145720Speter if (dma_bounced & (1 << chan)) { 35245720Speter /* copy bounce buffer on read */ 35357973Sphk if (flags & ISADMA_READ) 35445720Speter bcopy(dma_bouncebuf[chan], addr, nbytes); 35545720Speter 35645720Speter dma_bounced &= ~(1 << chan); 35745720Speter } 35845720Speter dma_busy &= ~(1 << chan); 35945720Speter} 36045720Speter 36145720Speter/* 36245720Speter * Check for problems with the address range of a DMA transfer 36345720Speter * (non-contiguous physical pages, outside of bus address space, 36445720Speter * crossing DMA page boundaries). 36545720Speter * Return true if special handling needed. 36645720Speter */ 36745720Speter 36845720Speterstatic int 36945720Speterisa_dmarangecheck(caddr_t va, u_int length, int chan) 37045720Speter{ 37145720Speter vm_offset_t phys, priorpage = 0, endva; 37245720Speter u_int dma_pgmsk = (chan & 4) ? ~(128*1024-1) : ~(64*1024-1); 37345720Speter 37445720Speter endva = (vm_offset_t)round_page((vm_offset_t)va + length); 37545720Speter for (; va < (caddr_t) endva ; va += PAGE_SIZE) { 37645720Speter phys = trunc_page(pmap_extract(pmap_kernel(), (vm_offset_t)va)); 37745720Speter#define ISARAM_END RAM_END 37845720Speter if (phys == 0) 37945720Speter panic("isa_dmacheck: no physical page present"); 38045720Speter if (phys >= ISARAM_END) 38145720Speter return (1); 38245720Speter if (priorpage) { 38345720Speter if (priorpage + PAGE_SIZE != phys) 38445720Speter return (1); 38545720Speter /* check if crossing a DMA page boundary */ 38645720Speter if (((u_int)priorpage ^ (u_int)phys) & dma_pgmsk) 38745720Speter return (1); 38845720Speter } 38945720Speter priorpage = phys; 39045720Speter } 39145720Speter return (0); 39245720Speter} 39345720Speter 39445720Speter/* 39545720Speter * Query the progress of a transfer on a DMA channel. 39645720Speter * 39745720Speter * To avoid having to interrupt a transfer in progress, we sample 39845720Speter * each of the high and low databytes twice, and apply the following 39945720Speter * logic to determine the correct count. 40045720Speter * 40145720Speter * Reads are performed with interrupts disabled, thus it is to be 40245720Speter * expected that the time between reads is very small. At most 40345720Speter * one rollover in the low count byte can be expected within the 40445720Speter * four reads that are performed. 40545720Speter * 40645720Speter * There are three gaps in which a rollover can occur : 40745720Speter * 40845720Speter * - read low1 40945720Speter * gap1 41045720Speter * - read high1 41145720Speter * gap2 41245720Speter * - read low2 41345720Speter * gap3 41445720Speter * - read high2 41545720Speter * 41645720Speter * If a rollover occurs in gap1 or gap2, the low2 value will be 41745720Speter * greater than the low1 value. In this case, low2 and high2 are a 41845720Speter * corresponding pair. 41945720Speter * 42045720Speter * In any other case, low1 and high1 can be considered to be correct. 42145720Speter * 42245720Speter * The function returns the number of bytes remaining in the transfer, 42345720Speter * or -1 if the channel requested is not active. 42445720Speter * 42545720Speter */ 42645720Speterint 42745720Speterisa_dmastatus(int chan) 42845720Speter{ 42945720Speter u_long cnt = 0; 43045720Speter int ffport, waport; 43145720Speter u_long low1, high1, low2, high2; 43245720Speter 43345720Speter /* channel active? */ 43445720Speter if ((dma_inuse & (1 << chan)) == 0) { 43545720Speter printf("isa_dmastatus: channel %d not active\n", chan); 43645720Speter return(-1); 43745720Speter } 43845720Speter /* channel busy? */ 43945720Speter 44045720Speter if (((dma_busy & (1 << chan)) == 0) && 44145720Speter (dma_auto_mode & (1 << chan)) == 0 ) { 44245720Speter printf("chan %d not busy\n", chan); 44345720Speter return -2 ; 44445720Speter } 44545720Speter if (chan < 4) { /* low DMA controller */ 44645720Speter ffport = DMA1_FFC; 44745720Speter waport = DMA1_CHN(chan) + 1; 44845720Speter } else { /* high DMA controller */ 44945720Speter ffport = DMA2_FFC; 45045720Speter waport = DMA2_CHN(chan - 4) + 2; 45145720Speter } 45245720Speter 45345720Speter disable_intr(); /* no interrupts Mr Jones! */ 45445720Speter outb(ffport, 0); /* clear register LSB flipflop */ 45545720Speter low1 = inb(waport); 45645720Speter high1 = inb(waport); 45745720Speter outb(ffport, 0); /* clear again */ 45845720Speter low2 = inb(waport); 45945720Speter high2 = inb(waport); 46045720Speter enable_intr(); /* enable interrupts again */ 46145720Speter 46245720Speter /* 46345720Speter * Now decide if a wrap has tried to skew our results. 46445720Speter * Note that after TC, the count will read 0xffff, while we want 46545720Speter * to return zero, so we add and then mask to compensate. 46645720Speter */ 46745720Speter if (low1 >= low2) { 46845720Speter cnt = (low1 + (high1 << 8) + 1) & 0xffff; 46945720Speter } else { 47045720Speter cnt = (low2 + (high2 << 8) + 1) & 0xffff; 47145720Speter } 47245720Speter 47345720Speter if (chan >= 4) /* high channels move words */ 47445720Speter cnt *= 2; 47545720Speter return(cnt); 47645720Speter} 47745720Speter 47845720Speter/* 47945720Speter * Stop a DMA transfer currently in progress. 48045720Speter */ 48145720Speterint 48245720Speterisa_dmastop(int chan) 48345720Speter{ 48445720Speter if ((dma_inuse & (1 << chan)) == 0) 48545720Speter printf("isa_dmastop: channel %d not acquired\n", chan); 48645720Speter 48745720Speter if (((dma_busy & (1 << chan)) == 0) && 48845720Speter ((dma_auto_mode & (1 << chan)) == 0)) { 48945720Speter printf("chan %d not busy\n", chan); 49045720Speter return -2 ; 49145720Speter } 49245720Speter 49345720Speter if ((chan & 4) == 0) { 49445720Speter outb(DMA1_SMSK, (chan & 3) | 4 /* disable mask */); 49545720Speter } else { 49645720Speter outb(DMA2_SMSK, (chan & 3) | 4 /* disable mask */); 49745720Speter } 49845720Speter return(isa_dmastatus(chan)); 49945720Speter} 50061994Smsmith 50161994Smsmith/* 50261994Smsmith * Attach to the ISA PnP descriptor for the AT DMA controller 50361994Smsmith */ 50461994Smsmithstatic struct isa_pnp_id atdma_ids[] = { 50561994Smsmith { 0x0002d041 /* PNP0200 */, "AT DMA controller" }, 50661994Smsmith { 0 } 50761994Smsmith}; 50861994Smsmith 50961994Smsmithstatic int 51061994Smsmithatdma_probe(device_t dev) 51161994Smsmith{ 51261994Smsmith int result; 51361994Smsmith 51461994Smsmith if ((result = ISA_PNP_PROBE(device_get_parent(dev), dev, atdma_ids)) <= 0) 51561994Smsmith device_quiet(dev); 51661994Smsmith return(result); 51761994Smsmith} 51861994Smsmith 51961994Smsmithstatic int 52061994Smsmithatdma_attach(device_t dev) 52161994Smsmith{ 52261994Smsmith return(0); 52361994Smsmith} 52461994Smsmith 52561994Smsmithstatic device_method_t atdma_methods[] = { 52661994Smsmith /* Device interface */ 52761994Smsmith DEVMETHOD(device_probe, atdma_probe), 52861994Smsmith DEVMETHOD(device_attach, atdma_attach), 52961994Smsmith DEVMETHOD(device_detach, bus_generic_detach), 53061994Smsmith DEVMETHOD(device_shutdown, bus_generic_shutdown), 53161994Smsmith DEVMETHOD(device_suspend, bus_generic_suspend), 53261994Smsmith DEVMETHOD(device_resume, bus_generic_resume), 53361994Smsmith { 0, 0 } 53461994Smsmith}; 53561994Smsmith 53661994Smsmithstatic driver_t atdma_driver = { 53761994Smsmith "atdma", 53861994Smsmith atdma_methods, 53961994Smsmith 1, /* no softc */ 54061994Smsmith}; 54161994Smsmith 54261994Smsmithstatic devclass_t atdma_devclass; 54361994Smsmith 54461994SmsmithDRIVER_MODULE(atdma, isa, atdma_driver, atdma_devclass, 0, 0); 545