/*- * 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. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 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 * $Id: isa.c,v 1.2 1997/08/21 04:51:00 smp Exp smp $ */ /* * 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 #include #include #include #include #include #ifdef APIC_IO #include #endif /* APIC_IO */ #include #include #include #include #include #include #include #include /* ** Register definitions for DMA controller 1 (channels 0..3): */ #define DMA1_CHN(c) (IO_DMA1 + 1*(2*(c))) /* addr reg for channel c */ #define DMA1_SMSK (IO_DMA1 + 1*10) /* single mask register */ #define DMA1_MODE (IO_DMA1 + 1*11) /* mode register */ #define DMA1_FFC (IO_DMA1 + 1*12) /* clear first/last FF */ /* ** Register definitions for DMA controller 2 (channels 4..7): */ #define DMA2_CHN(c) (IO_DMA2 + 2*(2*(c))) /* addr reg for channel c */ #define DMA2_SMSK (IO_DMA2 + 2*10) /* single mask register */ #define DMA2_MODE (IO_DMA2 + 2*11) /* mode register */ #define DMA2_FFC (IO_DMA2 + 2*12) /* clear first/last FF */ static void config_isadev __P((struct isa_device *isdp, u_int *mp)); static void config_isadev_c __P((struct isa_device *isdp, u_int *mp, int reconfig)); static void conflict __P((struct isa_device *dvp, struct isa_device *tmpdvp, int item, char const *whatnot, char const *reason, char const *format)); static int haveseen __P((struct isa_device *dvp, struct isa_device *tmpdvp, u_int checkbits)); static int isa_dmarangecheck __P((caddr_t va, u_int length, int chan)); /* * print a conflict message */ static void conflict(dvp, tmpdvp, item, whatnot, reason, format) struct isa_device *dvp; struct isa_device *tmpdvp; int item; char const *whatnot; char const *reason; char const *format; { printf("%s%d not %sed due to %s conflict with %s%d at ", dvp->id_driver->name, dvp->id_unit, whatnot, reason, tmpdvp->id_driver->name, tmpdvp->id_unit); printf(format, item); printf("\n"); } /* * Check to see if things are already in use, like IRQ's, I/O addresses * and Memory addresses. */ static int haveseen(dvp, tmpdvp, checkbits) struct isa_device *dvp; struct isa_device *tmpdvp; u_int checkbits; { /* * Only check against devices that have already been found and are not * unilaterally allowed to conflict anyway. */ if (tmpdvp->id_alive && !dvp->id_conflicts) { char const *whatnot; whatnot = checkbits & CC_ATTACH ? "attach" : "prob"; /* * Check for I/O address conflict. We can only check the * starting address of the device against the range of the * device that has already been probed since we do not * know how many I/O addresses this device uses. */ if (checkbits & CC_IOADDR && tmpdvp->id_alive != -1) { if ((dvp->id_iobase >= tmpdvp->id_iobase) && (dvp->id_iobase <= (tmpdvp->id_iobase + tmpdvp->id_alive - 1))) { conflict(dvp, tmpdvp, dvp->id_iobase, whatnot, "I/O address", "0x%x"); return 1; } } /* * Check for Memory address conflict. We can check for * range overlap, but it will not catch all cases since the * driver may adjust the msize paramater during probe, for * now we just check that the starting address does not * fall within any allocated region. * XXX could add a second check after the probe for overlap, * since at that time we would know the full range. * XXX KERNBASE is a hack, we should have vaddr in the table! */ if (checkbits & CC_MEMADDR && tmpdvp->id_maddr) { if ((KERNBASE + dvp->id_maddr >= tmpdvp->id_maddr) && (KERNBASE + dvp->id_maddr <= (tmpdvp->id_maddr + tmpdvp->id_msize - 1))) { conflict(dvp, tmpdvp, (int)dvp->id_maddr, whatnot, "maddr", "0x%x"); return 1; } } /* * Check for IRQ conflicts. */ if (checkbits & CC_IRQ && tmpdvp->id_irq) { if (tmpdvp->id_irq == dvp->id_irq) { conflict(dvp, tmpdvp, ffs(dvp->id_irq) - 1, whatnot, "irq", "%d"); return 1; } } /* * Check for DRQ conflicts. */ if (checkbits & CC_DRQ && tmpdvp->id_drq != -1) { if (tmpdvp->id_drq == dvp->id_drq) { conflict(dvp, tmpdvp, dvp->id_drq, whatnot, "drq", "%d"); return 1; } } } return 0; } #ifdef RESOURCE_CHECK #include static int checkone (struct isa_device *dvp, int type, addr_t low, addr_t high, char *resname, char *resfmt, int attaching) { int result = 0; if (bootverbose) { if (low == high) printf("\tcheck %s: 0x%x\n", resname, low); else printf("\tcheck %s: 0x%x to 0x%x\n", resname, low, high); } if (resource_check(type, RESF_NONE, low, high) != NULL) { char *whatnot = attaching ? "attach" : "prob"; static struct isa_device dummydev; static struct isa_driver dummydrv; struct isa_device *tmpdvp = &dummydev; dummydev.id_driver = &dummydrv; dummydev.id_unit = 0; dummydrv.name = "pci"; conflict(dvp, tmpdvp, low, whatnot, resname, resfmt); result = 1; } else if (attaching) { if (low == high) printf("\tregister %s: 0x%x\n", resname, low); else printf("\tregister %s: 0x%x to 0x%x\n", resname, low, high); resource_claim(dvp, type, RESF_NONE, low, high); } return (result); } static int check_pciconflict(struct isa_device *dvp, int checkbits) { int result = 0; int attaching = (checkbits & CC_ATTACH) != 0; if (checkbits & CC_MEMADDR) { long maddr = dvp->id_maddr; long msize = dvp->id_msize; if (msize > 0) { if (checkone(dvp, REST_MEM, maddr, maddr + msize - 1, "maddr", "0x%x", attaching) != 0) { result = 1; attaching = 0; } } } if (checkbits & CC_IOADDR) { unsigned iobase = dvp->id_iobase; unsigned iosize = dvp->id_alive; if (iosize == -1) iosize = 1; /* XXX can't do much about this ... */ if (iosize > 0) { if (checkone(dvp, REST_PORT, iobase, iobase + iosize -1, "I/O address", "0x%x", attaching) != 0) { result = 1; attaching = 0; } } } if (checkbits & CC_IRQ) { int irq = ffs(dvp->id_irq) - 1; if (irq >= 0) { if (checkone(dvp, REST_INT, irq, irq, "irq", "%d", attaching) != 0) { result = 1; attaching = 0; } } } if (checkbits & CC_DRQ) { int drq = dvp->id_drq; if (drq >= 0) { if (checkone(dvp, REST_DMA, drq, drq, "drq", "%d", attaching) != 0) { result = 1; attaching = 0; } } } if (result != 0) resource_free (dvp); return (result); } #endif /* RESOURCE_CHECK */ /* * Search through all the isa_devtab_* tables looking for anything that * conflicts with the current device. */ int haveseen_isadev(dvp, checkbits) struct isa_device *dvp; u_int checkbits; { struct isa_device *tmpdvp; int status = 0; for (tmpdvp = isa_devtab_tty; tmpdvp->id_driver; tmpdvp++) { status |= haveseen(dvp, tmpdvp, checkbits); if (status) return status; } for (tmpdvp = isa_devtab_bio; tmpdvp->id_driver; tmpdvp++) { status |= haveseen(dvp, tmpdvp, checkbits); if (status) return status; } for (tmpdvp = isa_devtab_net; tmpdvp->id_driver; tmpdvp++) { status |= haveseen(dvp, tmpdvp, checkbits); if (status) return status; } for (tmpdvp = isa_devtab_null; tmpdvp->id_driver; tmpdvp++) { status |= haveseen(dvp, tmpdvp, checkbits); if (status) return status; } #ifdef RESOURCE_CHECK if (!dvp->id_conflicts) { status = check_pciconflict(dvp, checkbits); } else if (bootverbose) printf("\tnot checking for resource conflicts ...\n"); } #endif /* RESOURCE_CHECK */ return(status); } /* * Configure all ISA devices */ void isa_configure() { struct isa_device *dvp; splhigh(); printf("Probing for devices on the ISA bus:\n"); /* First probe all the sensitive probes */ for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) if (dvp->id_driver->sensitive_hw) config_isadev(dvp, &tty_imask); for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) if (dvp->id_driver->sensitive_hw) config_isadev(dvp, &bio_imask); for (dvp = isa_devtab_net; dvp->id_driver; dvp++) if (dvp->id_driver->sensitive_hw) config_isadev(dvp, &net_imask); for (dvp = isa_devtab_null; dvp->id_driver; dvp++) if (dvp->id_driver->sensitive_hw) config_isadev(dvp, (u_int *)NULL); /* Then all the bad ones */ for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) if (!dvp->id_driver->sensitive_hw) config_isadev(dvp, &tty_imask); for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) if (!dvp->id_driver->sensitive_hw) config_isadev(dvp, &bio_imask); for (dvp = isa_devtab_net; dvp->id_driver; dvp++) if (!dvp->id_driver->sensitive_hw) config_isadev(dvp, &net_imask); for (dvp = isa_devtab_null; dvp->id_driver; dvp++) if (!dvp->id_driver->sensitive_hw) config_isadev(dvp, (u_int *)NULL); bio_imask |= SWI_CLOCK_MASK; net_imask |= SWI_NET_MASK; tty_imask |= SWI_TTY_MASK; /* * XXX we should really add the tty device to net_imask when the line is * switched to SLIPDISC, and then remove it when it is switched away from * SLIPDISC. No need to block out ALL ttys during a splimp when only one * of them is running slip. * * XXX actually, blocking all ttys during a splimp doesn't matter so much * with sio because the serial interrupt layer doesn't use tty_imask. Only * non-serial ttys suffer. It's more stupid that ALL 'net's are blocked * during spltty. */ #include "sl.h" #if NSL > 0 net_imask |= tty_imask; tty_imask = net_imask; #endif /* bio_imask |= tty_imask ; can some tty devices use buffers? */ if (bootverbose) printf("imasks: bio %x, tty %x, net %x\n", bio_imask, tty_imask, net_imask); /* * Finish initializing intr_mask[]. Note that the partly * constructed masks aren't actually used since we're at splhigh. * For fully dynamic initialization, register_intr() and * icu_unset() will have to adjust the masks for _all_ * interrupts and for tty_imask, etc. */ for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) register_imask(dvp, tty_imask); for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) register_imask(dvp, bio_imask); for (dvp = isa_devtab_net; dvp->id_driver; dvp++) register_imask(dvp, net_imask); for (dvp = isa_devtab_null; dvp->id_driver; dvp++) register_imask(dvp, SWI_CLOCK_MASK); spl0(); } /* * Configure an ISA device. */ static void config_isadev(isdp, mp) struct isa_device *isdp; u_int *mp; { config_isadev_c(isdp, mp, 0); } void reconfig_isadev(isdp, mp) struct isa_device *isdp; u_int *mp; { config_isadev_c(isdp, mp, 1); } static void config_isadev_c(isdp, mp, reconfig) struct isa_device *isdp; u_int *mp; int reconfig; { u_int checkbits; int id_alive; int last_alive; struct isa_driver *dp = isdp->id_driver; if (!isdp->id_enabled) { printf("%s%d: disabled, not probed.\n", dp->name, isdp->id_unit); return; } checkbits = CC_DRQ | CC_IOADDR | CC_MEMADDR; if (!reconfig && haveseen_isadev(isdp, checkbits)) return; if (!reconfig && isdp->id_maddr) { isdp->id_maddr -= ISA_HOLE_START; isdp->id_maddr += atdevbase; } if (reconfig) { last_alive = isdp->id_alive; isdp->id_reconfig = 1; } else { last_alive = 0; isdp->id_reconfig = 0; } id_alive = (*dp->probe)(isdp); if (id_alive) { /* * Only print the I/O address range if id_alive != -1 * Right now this is a temporary fix just for the new * NPX code so that if it finds a 486 that can use trap * 16 it will not report I/O addresses. * Rod Grimes 04/26/94 */ if (!isdp->id_reconfig) { printf("%s%d", dp->name, isdp->id_unit); if (id_alive != -1) { if (isdp->id_iobase == -1) printf(" at ?"); else { printf(" at 0x%x", isdp->id_iobase); if (isdp->id_iobase + id_alive - 1 != isdp->id_iobase) { printf("-0x%x", isdp->id_iobase + id_alive - 1); } } } if (isdp->id_irq) printf(" irq %d", ffs(isdp->id_irq) - 1); if (isdp->id_drq != -1) printf(" drq %d", isdp->id_drq); if (isdp->id_maddr) printf(" maddr 0x%lx", kvtop(isdp->id_maddr)); if (isdp->id_msize) printf(" msize %d", isdp->id_msize); if (isdp->id_flags) printf(" flags 0x%x", isdp->id_flags); if (isdp->id_iobase && !(isdp->id_iobase & 0xf300)) { printf(" on motherboard"); } else if (isdp->id_iobase >= 0x1000 && !(isdp->id_iobase & 0x300)) { printf (" on eisa slot %d", isdp->id_iobase >> 12); } else { printf (" on isa"); } printf("\n"); /* * Check for conflicts again. The driver may have * changed *dvp. We should weaken the early check * since the driver may have been able to change * *dvp to avoid conflicts if given a chance. We * already skip the early check for IRQs and force * a check for IRQs in the next group of checks. */ checkbits |= CC_IRQ; if (haveseen_isadev(isdp, checkbits)) { return; } isdp->id_alive = id_alive; } (*dp->attach)(isdp); if (isdp->id_irq) { #ifdef APIC_IO /* * Some motherboards use upper IRQs for traditional * ISA INTerrupt sources. In particular we have * seen the secondary IDE connected to IRQ20. * This code detects and fixes this situation. */ u_int apic_mask; int rirq; apic_mask = isa_apic_mask(isdp->id_irq); if (apic_mask != isdp->id_irq) { rirq = ffs(isdp->id_irq) - 1; isdp->id_irq = apic_mask; undirect_isa_irq(rirq); /* free for ISA */ } #endif /* APIC_IO */ register_intr(ffs(isdp->id_irq) - 1, isdp->id_id, isdp->id_ri_flags, isdp->id_intr, mp, isdp->id_unit); } } else { if (isdp->id_reconfig) { (*dp->attach)(isdp); /* reconfiguration attach */ } if (!last_alive) { if (!isdp->id_reconfig) { printf("%s%d not found", dp->name, isdp->id_unit); if (isdp->id_iobase != -1) printf(" at 0x%x", isdp->id_iobase); printf("\n"); } } else { #if 0 /* This code has not been tested.... */ if (isdp->id_irq) { icu_unset(ffs(isdp->id_irq) - 1, isdp->id_intr); if (mp) INTRUNMASK(*mp, isdp->id_irq); } #else printf ("icu_unset() not supported here ...\n"); #endif } } } static caddr_t dma_bouncebuf[8]; static u_int dma_bouncebufsize[8]; static u_int8_t dma_bounced = 0; static u_int8_t dma_busy = 0; /* Used in isa_dmastart() */ static u_int8_t dma_inuse = 0; /* User for acquire/release */ #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. */ void isa_dmainit(chan, bouncebufsize) int chan; u_int bouncebufsize; { void *buf; #ifdef DIAGNOSTIC if (chan & ~VALID_DMA_MASK) panic("isa_dmainit: channel out of range"); if (dma_bouncebuf[chan] != NULL) panic("isa_dmainit: impossible request"); #endif dma_bouncebufsize[chan] = bouncebufsize; /* Try malloc() first. It works better if it works. */ buf = malloc(bouncebufsize, M_DEVBUF, M_NOWAIT); if (buf != NULL) { if (isa_dmarangecheck(buf, bouncebufsize, chan) == 0) { dma_bouncebuf[chan] = buf; return; } free(buf, M_DEVBUF); } buf = contigmalloc(bouncebufsize, M_DEVBUF, M_NOWAIT, 0ul, 0xfffffful, 1ul, chan & 4 ? 0x20000ul : 0x10000ul); if (buf == NULL) printf("isa_dmainit(%d, %d) failed\n", chan, bouncebufsize); else dma_bouncebuf[chan] = buf; } /* * Register a DMA channel's usage. Usually called from a device driver * in open() or during it's 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); return (0); } /* * Unregister a DMA channel's usage. Usually called from a device driver * during close() or during it's 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); } /* * 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, avoid page alignment * problems by using a bounce buffer. */ void isa_dmastart(int flags, caddr_t addr, u_int nbytes, int chan) { vm_offset_t phys; int waport; caddr_t newaddr; #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) || (u_int)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 dma_busy |= (1 << chan); if (isa_dmarangecheck(addr, nbytes, chan)) { if (dma_bouncebuf[chan] == NULL || dma_bouncebufsize[chan] < nbytes) panic("isa_dmastart: bad bounce buffer"); dma_bounced |= (1 << chan); newaddr = dma_bouncebuf[chan]; /* copy bounce buffer on write */ if (!(flags & B_READ)) bcopy(addr, newaddr, nbytes); addr = newaddr; } /* translate to physical */ phys = pmap_extract(pmap_kernel(), (vm_offset_t)addr); 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 B_RAW flag is set, then use autoinitialise mode */ if (flags & B_RAW) { if (flags & B_READ) outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_WRITE|chan); else outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_READ|chan); } else if (flags & B_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 B_RAW flag is set, then use autoinitialise mode */ if (flags & B_RAW) { if (flags & B_READ) outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_WRITE|(chan&3)); else outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_READ|(chan&3)); } else if (flags & B_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_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 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)) == 0) printf("isa_dmadone: channel %d not busy\n", chan); #endif if (dma_bounced & (1 << chan)) { /* copy bounce buffer on read */ if (flags & B_READ) bcopy(dma_bouncebuf[chan], addr, nbytes); dma_bounced &= ~(1 << chan); } dma_busy &= ~(1 << chan); } /* * Check for problems with the address range of a DMA transfer * (non-contiguous physical pages, outside of bus address space, * crossing DMA page boundaries). * Return true if special handling needed. */ static int isa_dmarangecheck(caddr_t va, u_int length, int chan) { vm_offset_t phys, priorpage = 0, endva; u_int dma_pgmsk = (chan & 4) ? ~(128*1024-1) : ~(64*1024-1); endva = (vm_offset_t)round_page(va + length); for (; va < (caddr_t) endva ; va += PAGE_SIZE) { phys = trunc_page(pmap_extract(pmap_kernel(), (vm_offset_t)va)); #define ISARAM_END RAM_END if (phys == 0) panic("isa_dmacheck: no physical page present"); if (phys >= ISARAM_END) return (1); if (priorpage) { if (priorpage + PAGE_SIZE != phys) return (1); /* check if crossing a DMA page boundary */ if (((u_int)priorpage ^ (u_int)phys) & dma_pgmsk) return (1); } priorpage = phys; } return (0); } /* * 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; u_long ef; /* channel active? */ if ((dma_inuse & (1 << chan)) == 0) { printf("isa_dmastatus: channel %d not active\n", chan); return(-1); } /* still busy? */ if ((dma_busy & (1 << chan)) == 0) { return(0); } 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; } disable_intr(); /* 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); enable_intr(); /* 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); } /* * Find the highest priority enabled display device. Since we can't * distinguish display devices from ttys, depend on display devices * being sensitive and before sensitive non-display devices (if any) * in isa_devtab_tty. * * XXX we should add capability flags IAMDISPLAY and ISUPPORTCONSOLES. */ struct isa_device * find_display() { struct isa_device *dvp; for (dvp = isa_devtab_tty; dvp->id_driver != NULL; dvp++) if (dvp->id_driver->sensitive_hw && dvp->id_enabled) return (dvp); return (NULL); } /* * find an ISA device in a given isa_devtab_* table, given * the table to search, the expected id_driver entry, and the unit number. * * this function is defined in isa_device.h, and this location is debatable; * i put it there because it's useless w/o, and directly operates on * the other stuff in that file. * */ struct isa_device *find_isadev(table, driverp, unit) struct isa_device *table; struct isa_driver *driverp; int unit; { if (driverp == NULL) /* sanity check */ return (NULL); while ((table->id_driver != driverp) || (table->id_unit != unit)) { if (table->id_driver == 0) return NULL; table++; } return (table); }