diff options
Diffstat (limited to 'sys/ia64/isa/isa_dma.c')
| -rw-r--r-- | sys/ia64/isa/isa_dma.c | 508 |
1 files changed, 0 insertions, 508 deletions
diff --git a/sys/ia64/isa/isa_dma.c b/sys/ia64/isa/isa_dma.c deleted file mode 100644 index 1b093e5..0000000 --- a/sys/ia64/isa/isa_dma.c +++ /dev/null @@ -1,508 +0,0 @@ -/*- - * Copyright (c) 1991 The Regents of the University of California. - * All rights reserved. - * - * This code is derived from software contributed to Berkeley by - * William Jolitz. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 4. Neither the name of the University nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - * - * from: @(#)isa.c 7.2 (Berkeley) 5/13/91 - * from: isa_dma.c,v 1.3 1999/05/09 23:56:00 peter Exp $ - * $FreeBSD$ - */ - -/* - * code to manage AT bus - * - * 92/08/18 Frank P. MacLachlan (fpm@crash.cts.com): - * Fixed uninitialized variable problem and added code to deal - * with DMA page boundaries in isa_dmarangecheck(). Fixed word - * mode DMA count compution and reorganized DMA setup code in - * isa_dmastart() - */ - -#include <sys/param.h> -#include <sys/systm.h> -#include <sys/malloc.h> -#include <sys/lock.h> -#include <sys/mutex.h> -#include <sys/bus.h> -#include <vm/vm.h> -#include <vm/vm_param.h> -#include <vm/pmap.h> -#include <isa/isareg.h> -#include <isa/isavar.h> -#include <isa/isa_dmareg.h> -#include <machine/bus.h> - -static bus_dma_tag_t dma_tag[8]; -static bus_dmamap_t dma_map[8]; -static u_int8_t dma_busy = 0; /* Used in isa_dmastart() */ -static u_int8_t dma_inuse = 0; /* User for acquire/release */ -static u_int8_t dma_auto_mode = 0; -static u_int8_t dma_bounced = 0; - -#define VALID_DMA_MASK (7) - -/* high byte of address is stored in this port for i-th dma channel */ -static int dmapageport[8] = { 0x87, 0x83, 0x81, 0x82, 0x8f, 0x8b, 0x89, 0x8a }; - -/* - * Setup a DMA channel's bounce buffer. - */ -int -isa_dma_init(int chan, u_int bouncebufsize, int flag __unused) -{ - static int initted = 0; - bus_addr_t boundary = chan >= 4 ? 0x20000 : 0x10000; - - if (!initted) { - /* - * Reset the DMA hardware. - */ - outb(DMA1_RESET, 0); - outb(DMA2_RESET, 0); - isa_dmacascade(4); - - initted = 1; - } - -#ifdef DIAGNOSTIC - if (chan & ~VALID_DMA_MASK) - panic("isa_dma_init: channel out of range"); - - if (dma_tag[chan] || dma_map[chan]) - panic("isa_dma_init: impossible request"); -#endif - - if (bus_dma_tag_create(/*parent*/NULL, - /*alignment*/2, - /*boundary*/boundary, - /*lowaddr*/BUS_SPACE_MAXADDR_24BIT, - /*highaddr*/BUS_SPACE_MAXADDR, - /*filter*/NULL, /*filterarg*/NULL, - /*maxsize*/bouncebufsize, - /*nsegments*/1, /*maxsegz*/0x3ffff, - /*flags*/0, - /*lockfunc*/busdma_lock_mutex, - /*lockarg*/&Giant, - &dma_tag[chan]) != 0) { - panic("isa_dma_init: unable to create dma tag\n"); - } - - if (bus_dmamap_create(dma_tag[chan], 0, &dma_map[chan])) { - panic("isa_dma_init: unable to create dma map\n"); - } - - return (0); -} - -/* - * Register a DMA channel's usage. Usually called from a device driver - * in open() or during its initialization. - */ -int -isa_dma_acquire(chan) - int chan; -{ -#ifdef DIAGNOSTIC - if (chan & ~VALID_DMA_MASK) - panic("isa_dma_acquire: channel out of range"); -#endif - - if (dma_inuse & (1 << chan)) { - printf("isa_dma_acquire: channel %d already in use\n", chan); - return (EBUSY); - } - dma_inuse |= (1 << chan); - dma_auto_mode &= ~(1 << chan); - - return (0); -} - -/* - * Unregister a DMA channel's usage. Usually called from a device driver - * during close() or during its shutdown. - */ -void -isa_dma_release(chan) - int chan; -{ -#ifdef DIAGNOSTIC - if (chan & ~VALID_DMA_MASK) - panic("isa_dma_release: channel out of range"); - - if ((dma_inuse & (1 << chan)) == 0) - printf("isa_dma_release: channel %d not in use\n", chan); -#endif - - if (dma_busy & (1 << chan)) { - dma_busy &= ~(1 << chan); - /* - * XXX We should also do "dma_bounced &= (1 << chan);" - * because we are acting on behalf of isa_dmadone() which - * was not called to end the last DMA operation. This does - * not matter now, but it may in the future. - */ - } - - dma_inuse &= ~(1 << chan); - dma_auto_mode &= ~(1 << chan); -} - -/* - * isa_dmacascade(): program 8237 DMA controller channel to accept - * external dma control by a board. - */ -void -isa_dmacascade(chan) - int chan; -{ -#ifdef DIAGNOSTIC - if (chan & ~VALID_DMA_MASK) - panic("isa_dmacascade: channel out of range"); -#endif - - /* set dma channel mode, and set dma channel mode */ - if ((chan & 4) == 0) { - outb(DMA1_MODE, DMA37MD_CASCADE | chan); - outb(DMA1_SMSK, chan); - } else { - outb(DMA2_MODE, DMA37MD_CASCADE | (chan & 3)); - outb(DMA2_SMSK, chan & 3); - } -} - -/* - * isa_dmastart(): program 8237 DMA controller channel. - */ - -struct isa_dmastart_arg { - caddr_t addr; - int chan; - int flags; -}; - -static void isa_dmastart_cb(void *arg, bus_dma_segment_t *segs, int nseg, - int error) -{ -#if 0 - caddr_t addr = ((struct isa_dmastart_arg *) arg)->addr; -#endif - int chan = ((struct isa_dmastart_arg *) arg)->chan; - int flags = ((struct isa_dmastart_arg *) arg)->flags; - bus_addr_t phys = segs->ds_addr; - int nbytes = segs->ds_len; - int waport; - - if (nseg != 1) - panic("isa_dmastart: transfer mapping not contiguous"); - -#if 0 - if ((chipset.sgmap == NULL) && - (pmap_extract(kernel_pmap, (vm_offset_t)addr) - > BUS_SPACE_MAXADDR_24BIT)) { - /* we bounced */ - dma_bounced |= (1 << chan); - /* copy bounce buffer on write */ - if (!(flags & ISADMA_READ)) - bus_dmamap_sync(dma_tag[chan], dma_map[chan], - BUS_DMASYNC_PREWRITE); - } -#endif - - if ((chan & 4) == 0) { - /* - * Program one of DMA channels 0..3. These are - * byte mode channels. - */ - /* set dma channel mode, and reset address ff */ - - /* If ISADMA_RAW flag is set, then use autoinitialise mode */ - if (flags & ISADMA_RAW) { - if (flags & ISADMA_READ) - outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_WRITE|chan); - else - outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_READ|chan); - } - else - if (flags & ISADMA_READ) - outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|chan); - else - outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_READ|chan); - outb(DMA1_FFC, 0); - - /* send start address */ - waport = DMA1_CHN(chan); - outb(waport, phys); - outb(waport, phys>>8); - outb(dmapageport[chan], phys>>16); - - /* send count */ - outb(waport + 1, --nbytes); - outb(waport + 1, nbytes>>8); - - /* unmask channel */ - outb(DMA1_SMSK, chan); - } else { - /* - * Program one of DMA channels 4..7. These are - * word mode channels. - */ - /* set dma channel mode, and reset address ff */ - - /* If ISADMA_RAW flag is set, then use autoinitialise mode */ - if (flags & ISADMA_RAW) { - if (flags & ISADMA_READ) - outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_WRITE|(chan&3)); - else - outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_READ|(chan&3)); - } - else - if (flags & ISADMA_READ) - outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|(chan&3)); - else - outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_READ|(chan&3)); - outb(DMA2_FFC, 0); - - /* send start address */ - waport = DMA2_CHN(chan - 4); - outb(waport, phys>>1); - outb(waport, phys>>9); - outb(dmapageport[chan], phys>>16); - - /* send count */ - nbytes >>= 1; - outb(waport + 2, --nbytes); - outb(waport + 2, nbytes>>8); - - /* unmask channel */ - outb(DMA2_SMSK, chan & 3); - } -} - -void -isa_dmastart(int flags, caddr_t addr, u_int nbytes, int chan) -{ - struct isa_dmastart_arg args; - -#ifdef DIAGNOSTIC - if (chan & ~VALID_DMA_MASK) - panic("isa_dmastart: channel out of range"); - - if ((chan < 4 && nbytes > (1<<16)) - || (chan >= 4 && (nbytes > (1<<17) || (uintptr_t)addr & 1))) - panic("isa_dmastart: impossible request"); - - if ((dma_inuse & (1 << chan)) == 0) - printf("isa_dmastart: channel %d not acquired\n", chan); -#endif - -#if 0 - /* - * XXX This should be checked, but drivers like ad1848 only call - * isa_dmastart() once because they use Auto DMA mode. If we - * leave this in, drivers that do this will print this continuously. - */ - if (dma_busy & (1 << chan)) - printf("isa_dmastart: channel %d busy\n", chan); -#endif - - if (!dma_tag[chan] || !dma_map[chan]) - panic("isa_dmastart: called without isa_dma_init"); - - dma_busy |= (1 << chan); - - if (flags & ISADMA_RAW) { - dma_auto_mode |= (1 << chan); - } else { - dma_auto_mode &= ~(1 << chan); - } - - /* - * Freeze dma while updating registers. - */ - outb(chan & 4 ? DMA2_SMSK : DMA1_SMSK, (chan & 3) | 4); - - args.addr = addr; - args.chan = chan; - args.flags = flags; - bus_dmamap_load(dma_tag[chan], dma_map[chan], addr, nbytes, - isa_dmastart_cb, &args, 0); -} - -void -isa_dmadone(int flags, caddr_t addr, int nbytes, int chan) -{ -#ifdef DIAGNOSTIC - if (chan & ~VALID_DMA_MASK) - panic("isa_dmadone: channel out of range"); - - if ((dma_inuse & (1 << chan)) == 0) - printf("isa_dmadone: channel %d not acquired\n", chan); -#endif - - if (((dma_busy & (1 << chan)) == 0) && - (dma_auto_mode & (1 << chan)) == 0 ) - printf("isa_dmadone: channel %d not busy\n", chan); - - if (dma_bounced & (1 << chan)) { - /* copy bounce buffer on read */ - if (flags & ISADMA_READ) { - bus_dmamap_sync(dma_tag[chan], dma_map[chan], - BUS_DMASYNC_POSTREAD); - } - dma_bounced &= ~(1 << chan); - } - - if ((dma_auto_mode & (1 << chan)) == 0) { - outb(chan & 4 ? DMA2_SMSK : DMA1_SMSK, (chan & 3) | 4); - bus_dmamap_unload(dma_tag[chan], dma_map[chan]); - } - - dma_busy &= ~(1 << chan); -} - -/* - * Query the progress of a transfer on a DMA channel. - * - * To avoid having to interrupt a transfer in progress, we sample - * each of the high and low databytes twice, and apply the following - * logic to determine the correct count. - * - * Reads are performed with interrupts disabled, thus it is to be - * expected that the time between reads is very small. At most - * one rollover in the low count byte can be expected within the - * four reads that are performed. - * - * There are three gaps in which a rollover can occur : - * - * - read low1 - * gap1 - * - read high1 - * gap2 - * - read low2 - * gap3 - * - read high2 - * - * If a rollover occurs in gap1 or gap2, the low2 value will be - * greater than the low1 value. In this case, low2 and high2 are a - * corresponding pair. - * - * In any other case, low1 and high1 can be considered to be correct. - * - * The function returns the number of bytes remaining in the transfer, - * or -1 if the channel requested is not active. - * - */ -int -isa_dmastatus(int chan) -{ - u_long cnt = 0; - int ffport, waport; - u_long low1, high1, low2, high2; - int s; - - /* channel active? */ - if ((dma_inuse & (1 << chan)) == 0) { - printf("isa_dmastatus: channel %d not active\n", chan); - return(-1); - } - /* channel busy? */ - - if (((dma_busy & (1 << chan)) == 0) && - (dma_auto_mode & (1 << chan)) == 0 ) { - printf("chan %d not busy\n", chan); - return -2 ; - } - if (chan < 4) { /* low DMA controller */ - ffport = DMA1_FFC; - waport = DMA1_CHN(chan) + 1; - } else { /* high DMA controller */ - ffport = DMA2_FFC; - waport = DMA2_CHN(chan - 4) + 2; - } - - s = splhigh(); /* no interrupts Mr Jones! */ - outb(ffport, 0); /* clear register LSB flipflop */ - low1 = inb(waport); - high1 = inb(waport); - outb(ffport, 0); /* clear again */ - low2 = inb(waport); - high2 = inb(waport); - splx(s); /* enable interrupts again */ - - /* - * Now decide if a wrap has tried to skew our results. - * Note that after TC, the count will read 0xffff, while we want - * to return zero, so we add and then mask to compensate. - */ - if (low1 >= low2) { - cnt = (low1 + (high1 << 8) + 1) & 0xffff; - } else { - cnt = (low2 + (high2 << 8) + 1) & 0xffff; - } - - if (chan >= 4) /* high channels move words */ - cnt *= 2; - return(cnt); -} - -/* - * Reached terminal count yet ? - */ -int -isa_dmatc(int chan) -{ - - if (chan < 4) - return(inb(DMA1_STATUS) & (1 << chan)); - else - return(inb(DMA2_STATUS) & (1 << (chan & 3))); -} - -/* - * Stop a DMA transfer currently in progress. - */ -int -isa_dmastop(int chan) -{ - if ((dma_inuse & (1 << chan)) == 0) - printf("isa_dmastop: channel %d not acquired\n", chan); - - if (((dma_busy & (1 << chan)) == 0) && - ((dma_auto_mode & (1 << chan)) == 0)) { - printf("chan %d not busy\n", chan); - return -2 ; - } - - if ((chan & 4) == 0) { - outb(DMA1_SMSK, (chan & 3) | 4 /* disable mask */); - } else { - outb(DMA2_SMSK, (chan & 3) | 4 /* disable mask */); - } - return(isa_dmastatus(chan)); -} |
