/*- * 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 1.5 1993/10/18 18:45:48 rgrimes Exp $ */ /* * 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 "param.h" #include "systm.h" #include "conf.h" #include "file.h" #include "buf.h" #include "uio.h" #include "syslog.h" #include "malloc.h" #include "rlist.h" #include "machine/segments.h" #include "vm/vm.h" #include "i386/isa/isa_device.h" #include "i386/isa/isa.h" #include "i386/isa/icu.h" #include "i386/isa/ic/i8237.h" #include "i386/isa/ic/i8042.h" /* ** 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 */ int config_isadev __P((struct isa_device *, u_int *)); /* * print a conflict message */ void conflict(dvp, tmpdvp, item, reason, format) struct isa_device *dvp, *tmpdvp; int item; char *reason; char *format; { printf("%s%d not probed due to %s conflict with %s%d at ", dvp->id_driver->name, dvp->id_unit, reason, tmpdvp->id_driver->name, tmpdvp->id_unit); printf(format, item); printf("\n"); } /* * Check to see if things are alread in use, like IRQ's, I/O addresses * and Memory addresses. */ int haveseen(dvp, tmpdvp) struct isa_device *dvp, *tmpdvp; { int status = 0; /* * Only check against devices that have already been found */ if (tmpdvp->id_alive) { /* * 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 (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, "I/O address", "0x%x"); status = 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(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, dvp->id_maddr, "maddr", "0x%x"); status = 1; } } /* * Check for IRQ conflicts. */ if(tmpdvp->id_irq) { if (tmpdvp->id_irq == dvp->id_irq) { conflict(dvp, tmpdvp, ffs(dvp->id_irq) - 1, "irq", "%d"); status = 1; } } /* * Check for DRQ conflicts. */ if(tmpdvp->id_drq != -1) { if (tmpdvp->id_drq == dvp->id_drq) { conflict(dvp, tmpdvp, dvp->id_drq, "drq", "%d"); status = 1; } } } return (status); } /* * Search through all the isa_devtab_* tables looking for anything that * conflicts with the current device. */ int haveseen_isadev(dvp) struct isa_device *dvp; { struct isa_device *tmpdvp; int status = 0; for (tmpdvp = isa_devtab_tty; tmpdvp->id_driver; tmpdvp++) { status |= haveseen(dvp, tmpdvp); } for (tmpdvp = isa_devtab_bio; tmpdvp->id_driver; tmpdvp++) { status |= haveseen(dvp, tmpdvp); } for (tmpdvp = isa_devtab_net; tmpdvp->id_driver; tmpdvp++) { status |= haveseen(dvp, tmpdvp); } for (tmpdvp = isa_devtab_null; tmpdvp->id_driver; tmpdvp++) { status |= haveseen(dvp, tmpdvp); } return(status); } /* * Configure all ISA devices */ void isa_configure() { struct isa_device *dvp; enable_intr(); splhigh(); INTREN(IRQ_SLAVE); printf("Probing for devices on the ISA bus:\n"); for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) { if (!haveseen_isadev(dvp)) config_isadev(dvp,&ttymask); } for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) { if (!haveseen_isadev(dvp)) config_isadev(dvp,&biomask); } for (dvp = isa_devtab_net; dvp->id_driver; dvp++) { if (!haveseen_isadev(dvp)) config_isadev(dvp,&netmask); } for (dvp = isa_devtab_null; dvp->id_driver; dvp++) { if (!haveseen_isadev(dvp)) config_isadev(dvp,(u_int *) NULL); } /* * XXX We should really add the tty device to netmask 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 splnet when only one * of them is running slip. */ #include "sl.h" #if NSL > 0 netmask |= ttymask; ttymask |= netmask; #endif /* biomask |= ttymask ; can some tty devices use buffers? */ printf("biomask %x ttymask %x netmask %x\n", biomask, ttymask, netmask); splnone(); } /* * Configure an ISA device. */ config_isadev(isdp, mp) struct isa_device *isdp; u_int *mp; { struct isa_driver *dp = isdp->id_driver; if (isdp->id_maddr) { extern u_int atdevbase; isdp->id_maddr -= 0xa0000; /* XXX should be a define */ isdp->id_maddr += atdevbase; } isdp->id_alive = (*dp->probe)(isdp); if (isdp->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 */ printf("%s%d", dp->name, isdp->id_unit); if (isdp->id_alive != -1) { printf(" at 0x%x", isdp->id_iobase); if ((isdp->id_iobase + isdp->id_alive - 1) != isdp->id_iobase) { printf("-0x%x", isdp->id_iobase + isdp->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%x", 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 < 0x100) printf(" on motherboard\n"); else printf(" on isa\n"); (*dp->attach)(isdp); if(isdp->id_irq) { int intrno; intrno = ffs(isdp->id_irq)-1; setidt(ICU_OFFSET+intrno, isdp->id_intr, SDT_SYS386IGT, SEL_KPL); if(mp) { INTRMASK(*mp,isdp->id_irq); } INTREN(isdp->id_irq); } } else { printf("%s%d not found", dp->name, isdp->id_unit); if (isdp->id_iobase) { printf(" at 0x%x", isdp->id_iobase); } printf("\n"); } } #define IDTVEC(name) __CONCAT(X,name) /* default interrupt vector table entries */ extern IDTVEC(intr0), IDTVEC(intr1), IDTVEC(intr2), IDTVEC(intr3), IDTVEC(intr4), IDTVEC(intr5), IDTVEC(intr6), IDTVEC(intr7), IDTVEC(intr8), IDTVEC(intr9), IDTVEC(intr10), IDTVEC(intr11), IDTVEC(intr12), IDTVEC(intr13), IDTVEC(intr14), IDTVEC(intr15); static *defvec[16] = { &IDTVEC(intr0), &IDTVEC(intr1), &IDTVEC(intr2), &IDTVEC(intr3), &IDTVEC(intr4), &IDTVEC(intr5), &IDTVEC(intr6), &IDTVEC(intr7), &IDTVEC(intr8), &IDTVEC(intr9), &IDTVEC(intr10), &IDTVEC(intr11), &IDTVEC(intr12), &IDTVEC(intr13), &IDTVEC(intr14), &IDTVEC(intr15) }; /* out of range default interrupt vector gate entry */ extern IDTVEC(intrdefault); /* * Fill in default interrupt table (in case of spuruious interrupt * during configuration of kernel, setup interrupt control unit */ isa_defaultirq() { int i; /* icu vectors */ for (i = NRSVIDT ; i < NRSVIDT+ICU_LEN ; i++) setidt(i, defvec[i], SDT_SYS386IGT, SEL_KPL); /* out of range vectors */ for (i = NRSVIDT; i < NIDT; i++) setidt(i, &IDTVEC(intrdefault), SDT_SYS386IGT, SEL_KPL); /* initialize 8259's */ outb(IO_ICU1, 0x11); /* reset; program device, four bytes */ outb(IO_ICU1+1, NRSVIDT); /* starting at this vector index */ outb(IO_ICU1+1, 1<<2); /* slave on line 2 */ #ifdef AUTO_EOI_1 outb(IO_ICU1+1, 2 | 1); /* auto EOI, 8086 mode */ #else outb(IO_ICU1+1, 1); /* 8086 mode */ #endif outb(IO_ICU1+1, 0xff); /* leave interrupts masked */ outb(IO_ICU1, 0x0a); /* default to IRR on read */ outb(IO_ICU1, 0xc0 | (3 - 1)); /* pri order 3-7, 0-2 (com2 first) */ outb(IO_ICU2, 0x11); /* reset; program device, four bytes */ outb(IO_ICU2+1, NRSVIDT+8); /* staring at this vector index */ outb(IO_ICU2+1,2); /* my slave id is 2 */ #ifdef AUTO_EOI_2 outb(IO_ICU2+1, 2 | 1); /* auto EOI, 8086 mode */ #else outb(IO_ICU2+1,1); /* 8086 mode */ #endif outb(IO_ICU2+1, 0xff); /* leave interrupts masked */ outb(IO_ICU2, 0x0a); /* default to IRR on read */ } /* region of physical memory known to be contiguous */ vm_offset_t isaphysmem; static caddr_t dma_bounce[8]; /* XXX */ static char bounced[8]; /* XXX */ #define MAXDMASZ 512 /* XXX */ /* high byte of address is stored in this port for i-th dma channel */ static short dmapageport[8] = { 0x87, 0x83, 0x81, 0x82, 0x8f, 0x8b, 0x89, 0x8a }; /* * isa_dmacascade(): program 8237 DMA controller channel to accept * external dma control by a board. */ void isa_dmacascade(unsigned chan) { if (chan > 7) panic("isa_dmacascade: impossible request"); /* 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, unsigned nbytes, unsigned chan) { vm_offset_t phys; int waport; caddr_t newaddr; if ( chan > 7 || (chan < 4 && nbytes > (1<<16)) || (chan >= 4 && (nbytes > (1<<17) || (u_int)addr & 1))) panic("isa_dmastart: impossible request"); if (isa_dmarangecheck(addr, nbytes, chan)) { if (dma_bounce[chan] == 0) dma_bounce[chan] = /*(caddr_t)malloc(MAXDMASZ, M_TEMP, M_WAITOK);*/ (caddr_t) isaphysmem + NBPG*chan; bounced[chan] = 1; newaddr = dma_bounce[chan]; *(int *) newaddr = 0; /* XXX */ /* 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 (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 (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) { /* copy bounce buffer on read */ /*if ((flags & (B_PHYS|B_READ)) == (B_PHYS|B_READ))*/ if (bounced[chan]) { bcopy(dma_bounce[chan], addr, nbytes); bounced[chan] = 0; } } /* * 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. */ isa_dmarangecheck(caddr_t va, unsigned length, unsigned 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 += NBPG) { 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 + NBPG != 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); } /* head of queue waiting for physmem to become available */ struct buf isa_physmemq; /* blocked waiting for resource to become free for exclusive use */ static isaphysmemflag; /* if waited for and call requested when free (B_CALL) */ static void (*isaphysmemunblock)(); /* needs to be a list */ /* * Allocate contiguous physical memory for transfer, returning * a *virtual* address to region. May block waiting for resource. * (assumed to be called at splbio()) */ caddr_t isa_allocphysmem(caddr_t va, unsigned length, void (*func)()) { isaphysmemunblock = func; while (isaphysmemflag & B_BUSY) { isaphysmemflag |= B_WANTED; sleep(&isaphysmemflag, PRIBIO); } isaphysmemflag |= B_BUSY; return((caddr_t)isaphysmem); } /* * Free contiguous physical memory used for transfer. * (assumed to be called at splbio()) */ void isa_freephysmem(caddr_t va, unsigned length) { isaphysmemflag &= ~B_BUSY; if (isaphysmemflag & B_WANTED) { isaphysmemflag &= B_WANTED; wakeup(&isaphysmemflag); if (isaphysmemunblock) (*isaphysmemunblock)(); } } /* * Handle a NMI, possibly a machine check. * return true to panic system, false to ignore. */ isa_nmi(cd) { log(LOG_CRIT, "\nNMI port 61 %x, port 70 %x\n", inb(0x61), inb(0x70)); return(0); } /* * Caught a stray interrupt, notify */ isa_strayintr(d) { /* DON'T BOTHER FOR NOW! */ /* for some reason, we get bursts of intr #7, even if not enabled! */ /* * Well the reason you got bursts of intr #7 is because someone * raised an interrupt line and dropped it before the 8259 could * prioritize it. This is documented in the intel data book. This * means you have BAD hardware! I have changed this so that only * the first 5 get logged, then it quits logging them, and puts * out a special message. rgrimes 3/25/1993 */ extern u_long intrcnt_stray; intrcnt_stray++; if (intrcnt_stray <= 5) log(LOG_ERR,"ISA strayintr %x\n", d); if (intrcnt_stray == 5) log(LOG_CRIT,"Too many ISA strayintr not logging any more\n"); } /* * Wait "n" microseconds. * Relies on timer 1 counting down from (TIMER_FREQ / hz) at * (1 * TIMER_FREQ) Hz. * Note: timer had better have been programmed before this is first used! * (The standard programming causes the timer to generate a square wave and * the counter is decremented twice every cycle.) */ #define CF (1 * TIMER_FREQ) #define TIMER_FREQ 1193182 /* XXX - should be elsewhere */ extern int hz; /* XXX - should be elsewhere */ int DELAY(n) int n; { int counter_limit; int prev_tick; int tick; int ticks_left; int sec; int usec; #ifdef DELAYDEBUG int getit_calls = 1; int n1; static int state = 0; if (state == 0) { state = 1; for (n1 = 1; n1 <= 10000000; n1 *= 10) DELAY(n1); state = 2; } if (state == 1) printf("DELAY(%d)...", n); #endif /* * Read the counter first, so that the rest of the setup overhead is * counted. Guess the initial overhead is 20 usec (on most systems it * takes about 1.5 usec for each of the i/o's in getit(). The loop * takes about 6 usec on a 486/33 and 13 usec on a 386/20. The * multiplications and divisions to scale the count take a while). */ prev_tick = getit(0, 0); n -= 20; /* * Calculate (n * (CF / 1e6)) without using floating point and without * any avoidable overflows. */ sec = n / 1000000; usec = n - sec * 1000000; ticks_left = sec * CF + usec * (CF / 1000000) + usec * ((CF % 1000000) / 1000) / 1000 + usec * (CF % 1000) / 1000000; counter_limit = TIMER_FREQ / hz; while (ticks_left > 0) { tick = getit(0, 0); #ifdef DELAYDEBUG ++getit_calls; #endif if (tick > prev_tick) ticks_left -= prev_tick - (tick - counter_limit); else ticks_left -= prev_tick - tick; prev_tick = tick; } #ifdef DELAYDEBUG if (state == 1) printf(" %d calls to getit() at %d usec each\n", getit_calls, (n + 5) / getit_calls); #endif } getit(unit, timer) { int high; int low; /* * XXX - isa.h defines bogus timers. There's no such timer as * IO_TIMER_2 = 0x48. There's a timer in the CMOS RAM chip but * its interface is quite different. Neither timer is an 8252. * We actually only call this with unit = 0 and timer = 0. It * could be static... */ /* * Protect ourself against interrupts. * XXX - sysbeep() and sysbeepstop() need protection. */ disable_intr(); /* * Latch the count for 'timer' (cc00xxxx, c = counter, x = any). */ outb(IO_TIMER1 + 3, timer << 6); low = inb(IO_TIMER1 + timer); high = inb(IO_TIMER1 + timer); enable_intr(); return ((high << 8) | low); } static beeping; static sysbeepstop(f) { /* disable counter 2 */ outb(0x61, inb(0x61) & 0xFC); if (f) timeout(sysbeepstop, 0, f); else beeping = 0; } void sysbeep(int pitch, int period) { outb(0x61, inb(0x61) | 3); /* enable counter 2 */ /* * XXX - move timer stuff to clock.c. * Program counter 2: * ccaammmb, c counter, a = access, m = mode, b = BCD * 1011x110, 11 for aa = LSB then MSB, x11 for mmm = square wave. */ outb(0x43, 0xb6); /* set command for counter 2, 2 byte write */ outb(0x42, pitch); outb(0x42, (pitch>>8)); if (!beeping) { beeping = period; timeout(sysbeepstop, period/2, period); } } /* * Pass command to keyboard controller (8042) */ unsigned kbc_8042cmd(val) { while (inb(KBSTATP)&KBS_IBF); if (val) outb(KBCMDP, val); while (inb(KBSTATP)&KBS_IBF); return (inb(KBDATAP)); } /* * 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; } /* * Return nonzero if a (masked) irq is pending for a given device. */ int isa_irq_pending(dvp) struct isa_device *dvp; { unsigned id_irq; id_irq = (unsigned short) dvp->id_irq; /* XXX silly type in struct */ if (id_irq & 0xff) return (inb(IO_ICU1) & id_irq); return (inb(IO_ICU2) & (id_irq >> 8)); }