diff options
| -rw-r--r-- | sys/pc98/pc98/pc98.c | 1144 |
1 files changed, 0 insertions, 1144 deletions
diff --git a/sys/pc98/pc98/pc98.c b/sys/pc98/pc98/pc98.c deleted file mode 100644 index 8517f97..0000000 --- a/sys/pc98/pc98/pc98.c +++ /dev/null @@ -1,1144 +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. - * 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 - * $FreeBSD$ - */ - -/* - * 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() - */ - -/* - * modified for PC9801 by A.Kojima F.Ukai M.Ishii - * Kyoto University Microcomputer Club (KMC) - */ -#ifdef PC98 -#include "opt_pc98.h" -#endif - -#include <sys/param.h> -#include <sys/systm.h> -#include <sys/buf.h> -#include <sys/malloc.h> -#include <machine/ipl.h> -#include <machine/md_var.h> -#ifdef APIC_IO -#include <machine/smp.h> -#endif /* APIC_IO */ -#include <vm/vm.h> -#include <vm/vm_param.h> -#include <vm/pmap.h> -#include <i386/isa/isa_device.h> -#include <i386/isa/intr_machdep.h> -#ifdef PC98 -#include <machine/cpufunc.h> -#include <pc98/pc98/pc98.h> -#include <pc98/pc98/pc98_machdep.h> -#include <pc98/pc98/epsonio.h> -#else -#include <i386/isa/isa.h> -#endif -#include <i386/isa/ic/i8237.h> - -#include <sys/interrupt.h> - -#include "pnp.h" -#if NPNP > 0 -#include <i386/isa/pnp.h> -#endif - -/* -** Register definitions for DMA controller 1 (channels 0..3): -*/ -#ifdef PC98 -#define DMA1_CHN(c) (IO_DMA + (chan<<2)) /* addr reg for channel c */ -#define DMA1_SMSK (IO_DMA + 0x14) /* single mask register */ -#define DMA1_MODE (IO_DMA + 0x16) /* mode register */ -#define DMA1_FFC (IO_DMA + 0x18) /* clear first/last FF */ -#else -#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 */ -#endif - -/* -** 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; -{ - /* - * Ignore all conflicts except IRQ ones if conflicts are allowed. - */ - if (dvp->id_conflicts) - checkbits &= ~(CC_DRQ | CC_IOADDR | CC_MEMADDR); - /* - * Only check against devices that have already been found. - */ - if (tmpdvp->id_alive) { - char const *whatnot; - - /* - * Check for device driver & unit conflict; just drop probing - * a device which has already probed true. This is usually - * not strictly a conflict, but rather the case of somebody - * having specified several mutually exclusive configurations - * for a single device. - */ - if (tmpdvp->id_driver == dvp->id_driver && - tmpdvp->id_unit == dvp->id_unit) { - return 1; - } - - 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))) { - if (!(checkbits & CC_QUIET)) - 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))) { - if (!(checkbits & CC_QUIET)) - 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) { - if (!(checkbits & CC_QUIET)) - 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) { - if (!(checkbits & CC_QUIET)) - conflict(dvp, tmpdvp, dvp->id_drq, - whatnot, "drq", "%d"); - return 1; - } - } - } - return 0; -} - -#ifdef RESOURCE_CHECK -#include <sys/drvresource.h> - -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; -{ -#if NPNP > 0 - struct pnp_dlist_node *nod; -#endif - 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_cam; 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; - } -#if NPNP > 0 - for (nod = pnp_device_list; nod != NULL; nod = nod->next) - if (status |= haveseen(dvp, &(nod->dev), checkbits)) - return status; -#endif -#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; - - 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_cam; dvp->id_driver; dvp++) - if (dvp->id_driver->sensitive_hw) - config_isadev(dvp, &cam_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_cam; dvp->id_driver; dvp++) - if (!dvp->id_driver->sensitive_hw) - config_isadev(dvp, &cam_imask); - for (dvp = isa_devtab_null; dvp->id_driver; dvp++) - if (!dvp->id_driver->sensitive_hw) - config_isadev(dvp, (u_int *)NULL); - -/* - * 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 - - 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_cam; dvp->id_driver; dvp++) - register_imask(dvp, cam_imask); - for (dvp = isa_devtab_null; dvp->id_driver; dvp++) - register_imask(dvp, SWI_CLOCK_MASK); -} - -/* - * 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) { - if (bootverbose) - 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); -#ifdef PC98 - printf (" on isa"); -#else - 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"); - } -#endif - 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_ATTACH | CC_IRQ; - if (haveseen_isadev(isdp, checkbits)) - return; - isdp->id_alive = id_alive; - } - (*dp->attach)(isdp); - if (isdp->id_irq != 0 && isdp->id_intr == NULL) - printf("%s%d: irq with no handler\n", - dp->name, isdp->id_unit); - if (isdp->id_irq != 0 && isdp->id_intr != NULL) { -#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 != 0 && isdp->id_intr != NULL) { - 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 - } - } -} - -#ifdef PC98 -static caddr_t dma_bouncebuf[4]; -static u_int dma_bouncebufsize[4]; -#else -static caddr_t dma_bouncebuf[8]; -static u_int dma_bouncebufsize[8]; -#endif -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 */ -static u_int8_t dma_auto_mode = 0; - -#ifdef PC98 -#define VALID_DMA_MASK (3) -#else -#define VALID_DMA_MASK (7) -#endif - -/* high byte of address is stored in this port for i-th dma channel */ -#ifdef PC98 -static int dmapageport[4] = { 0x27, 0x21, 0x23, 0x25 }; -#else /* IBM-PC */ -static int dmapageport[8] = { 0x87, 0x83, 0x81, 0x82, 0x8f, 0x8b, 0x89, 0x8a }; -#endif - -/* - * 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 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); -} - -#ifndef PC98 -/* - * 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); - } -} -#endif - -/* - * 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 (flags & B_RAW) { - dma_auto_mode |= (1 << chan); - } else { - dma_auto_mode &= ~(1 << chan); - } - - if (need_pre_dma_flush) - wbinvd(); /* wbinvd (WB cache flush) */ - - -#ifndef PC98 - if ((chan & 4) == 0) { - /* - * Program one of DMA channels 0..3. These are - * byte mode channels. - */ -#endif - /* 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 + 2, --nbytes); - outb(waport + 2, nbytes>>8); - - /* unmask channel */ - outb(DMA1_SMSK, chan); -#ifndef PC98 - } 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); - } -#endif -} - -void -isa_dmadone(int flags, caddr_t addr, int nbytes, int chan) -{ - if (flags & B_READ) { - /* cache flush only after reading 92/12/9 by A.Kojima */ - if (need_post_dma_flush) - invd(); - } - -#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); - -#ifdef PC98 - if ((dma_auto_mode & (1 << chan)) == 0) - outb(DMA1_SMSK, (chan & 3) | 4); -#else - if ((dma_auto_mode & (1 << chan)) == 0) - outb(chan & 4 ? DMA2_SMSK : DMA1_SMSK, (chan & 3) | 4); -#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((vm_offset_t)va + length); - for (; va < (caddr_t) endva ; va += PAGE_SIZE) { - phys = trunc_page(pmap_extract(pmap_kernel(), (vm_offset_t)va)); -#ifdef EPSON_BOUNCEDMA -#define ISARAM_END 0xf00000 -#else -#define ISARAM_END RAM_END -#endif - 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; - - /* 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 ; - } - -#ifdef PC98 - ffport = DMA1_FFC; - waport = DMA1_CHN(chan) + 2; -#else - 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; - } -#endif - 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); -} - -/* - * 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 { -#ifndef PC98 - outb(DMA2_SMSK, (chan & 3) | 4 /* disable mask */); -#endif - } - return(isa_dmastatus(chan)); -} - -/* - * 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); -} |
