/* $NetBSD: ad1848_isa.c,v 1.26 2004/07/09 03:15:01 mycroft Exp $ */ /*- * Copyright (c) 1999 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Ken Hornstein and John Kohl. * * 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 NetBSD * Foundation, Inc. and its contributors. * 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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. */ /* * Copyright (c) 1994 John Brezak * Copyright (c) 1991-1993 Regents of the University of California. * All rights reserved. * * 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 Computer Systems * Engineering Group at Lawrence Berkeley Laboratory. * 4. Neither the name of the University nor of the Laboratory 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. * */ /* * Copyright by Hannu Savolainen 1994 * * 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. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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. * */ /* * Portions of this code are from the VOXware support for the ad1848 * by Hannu Savolainen * * Portions also supplied from the SoundBlaster driver for NetBSD. */ #include __KERNEL_RCSID(0, "$NetBSD: ad1848_isa.c,v 1.26 2004/07/09 03:15:01 mycroft Exp $"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef AUDIO_DEBUG #define DPRINTF(x) if (ad1848debug) printf x extern int ad1848debug; #else #define DPRINTF(x) #endif static int ad1848_isa_read __P(( struct ad1848_softc *, int)); static void ad1848_isa_write __P(( struct ad1848_softc *, int, int)); int ad1848_isa_read(sc, index) struct ad1848_softc *sc; int index; { return (bus_space_read_1(sc->sc_iot, sc->sc_ioh, index)); } void ad1848_isa_write(sc, index, value) struct ad1848_softc *sc; int index; int value; { bus_space_write_1(sc->sc_iot, sc->sc_ioh, index, value); } /* * Map and probe for the ad1848 chip */ int ad1848_isa_mapprobe(isc, iobase) struct ad1848_isa_softc *isc; int iobase; { struct ad1848_softc *sc = &isc->sc_ad1848; if (!AD1848_BASE_VALID(iobase)) { #ifdef AUDIO_DEBUG printf("ad1848: configured iobase %04x invalid\n", iobase); #endif return 0; } /* Map the AD1848 ports */ if (bus_space_map(sc->sc_iot, iobase, AD1848_NPORT, 0, &sc->sc_ioh)) return 0; if (!ad1848_isa_probe(isc)) { bus_space_unmap(sc->sc_iot, sc->sc_ioh, AD1848_NPORT); return 0; } else return 1; } /* * Probe for the ad1848 chip */ int ad1848_isa_probe(isc) struct ad1848_isa_softc *isc; { struct ad1848_softc *sc = &isc->sc_ad1848; u_char tmp, tmp1 = 0xff, tmp2 = 0xff; int i, t; sc->sc_readreg = ad1848_isa_read; sc->sc_writereg = ad1848_isa_write; /* Is there an ad1848 chip ? */ sc->MCE_bit = MODE_CHANGE_ENABLE; sc->mode = 1; /* MODE 1 = original ad1848/ad1846/cs4248 */ /* * Check that the I/O address is in use. * * The SP_IN_INIT bit of the base I/O port is known to be 0 after the * chip has performed its power-on initialization. Just assume * this has happened before the OS is starting. * * If the I/O address is unused, inb() typically returns 0xff. */ tmp = ADREAD(sc, AD1848_IADDR); if (tmp & SP_IN_INIT) { /* Not a AD1848 */ DPRINTF(("ad_detect_A %x\n", tmp)); goto bad; } /* * Test if it's possible to change contents of the indirect registers. * Registers 0 and 1 are ADC volume registers. The bit 0x10 is read * only so try to avoid using it. The bit 0x20 is the mic preamp * enable; on some chips it is always the same in both registers, so * we avoid tests where they are different. */ ad_write(sc, 0, 0x8a); ad_write(sc, 1, 0x45); /* 0x55 with bit 0x10 clear */ tmp1 = ad_read(sc, 0); tmp2 = ad_read(sc, 1); if (tmp1 != 0x8a || tmp2 != 0x45) { DPRINTF(("ad_detect_B (%x/%x)\n", tmp1, tmp2)); goto bad; } ad_write(sc, 0, 0x65); ad_write(sc, 1, 0xaa); tmp1 = ad_read(sc, 0); tmp2 = ad_read(sc, 1); if (tmp1 != 0x65 || tmp2 != 0xaa) { DPRINTF(("ad_detect_C (%x/%x)\n", tmp1, tmp2)); goto bad; } /* * The indirect register I12 has some read only bits. Lets * try to change them. */ tmp = ad_read(sc, SP_MISC_INFO); ad_write(sc, SP_MISC_INFO, (~tmp) & 0x0f); /* Here, AD1845 may sometimes be busy. Wait til it becomes ready. */ for (t = 0; t < 100000 && ADREAD(sc, AD1848_IADDR) & SP_IN_INIT; t++) ; #ifdef AUDIO_DEBUG if (t) DPRINTF(("ad1848_isa_probe: t %d\n", t)); #endif if ((tmp & 0x0f) != ((tmp1 = ad_read(sc, SP_MISC_INFO)) & 0x0f)) { DPRINTF(("ad_detect_D (%x)\n", tmp1)); goto bad; } /* * MSB and 4 LSBs of the reg I12 tell the chip revision. * * A preliminary version of the AD1846 data sheet stated that it * used an ID field of 0x0B. The current version, however, * states that the AD1846 uses ID 0x0A, just like the AD1848K. * * this switch statement will need updating as newer clones arrive.... */ switch (tmp1 & 0x8f) { case 0x09: sc->chip_name = "AD1848J"; break; case 0x0A: sc->chip_name = "AD1848K"; break; #if 0 /* See above */ case 0x0B: sc->chip_name = "AD1846"; break; #endif case 0x81: sc->chip_name = "CS4248revB"; /* or CS4231 rev B; see below */ break; case 0x89: sc->chip_name = "CS4248"; break; case 0x8A: sc->chip_name = "broken"; /* CS4231/AD1845; see below */ break; default: sc->chip_name = "unknown"; DPRINTF(("ad1848: unknown codec version 0x%02x\n", tmp1 & 0x8f)); break; } /* * The original AD1848/CS4248 has just 16 indirect registers. This * means that I0 and I16 should return the same value (etc.). * Ensure that the Mode2 enable bit of I12 is 0. Otherwise this test * fails with CS4231, AD1845, etc. */ ad_write(sc, SP_MISC_INFO, 0); /* Mode2 = disabled */ for (i = 0; i < 16; i++) if ((tmp1 = ad_read(sc, i)) != (tmp2 = ad_read(sc, i + 16))) { if (i != SP_TEST_AND_INIT) { DPRINTF(("ad_detect_F(%d/%x/%x)\n", i, tmp1, tmp2)); goto bad; } } /* * Try to switch the chip to mode2 (CS4231) by setting the MODE2 bit * The bit 0x80 is always 1 in CS4248, CS4231, and AD1845. */ ad_write(sc, SP_MISC_INFO, MODE2); /* Set mode2, clear 0x80 */ tmp1 = ad_read(sc, SP_MISC_INFO); if ((tmp1 & 0xc0) == (0x80 | MODE2)) { /* * CS4231 or AD1845 detected - is it? * * Verify that setting I2 doesn't change I18. */ ad_write(sc, 18, 0x88); /* Set I18 to known value */ ad_write(sc, 2, 0x45); if ((tmp2 = ad_read(sc, 18)) != 0x45) { /* No change -> CS4231? */ ad_write(sc, 2, 0xaa); if ((tmp2 = ad_read(sc, 18)) == 0xaa) { /* Rotten bits? */ DPRINTF(("ad_detect_H(%x)\n", tmp2)); goto bad; } sc->mode = 2; /* * It's a CS4231, or another clone with 32 registers. * Let's find out which by checking I25. */ if ((tmp1 & 0x8f) == 0x8a) { tmp1 = ad_read(sc, CS_VERSION_ID); switch (tmp1 & 0xe7) { case 0xA0: sc->chip_name = "CS4231A"; break; case 0x80: /* XXX I25 no good, AD1845 same as CS4231 */ /* * XXX * This test is correct only after reset */ if (ad_read(sc, 17) & 0xf0) { sc->chip_name = "AD1845"; sc->is_ad1845 = 1; } else sc->chip_name = "CS4231"; break; case 0x82: sc->chip_name = "CS4232"; break; case 0x03: case 0x83: sc->chip_name = "CS4236"; /* * Try to switch to mode3 (CS4236B or * CS4237B) by setting CMS to 3. A * plain CS4236 will not react to * LLBM settings. */ ad_write(sc, SP_MISC_INFO, MODE3); tmp1 = ad_read(sc, CS_LEFT_LINE_CONTROL); ad_write(sc, CS_LEFT_LINE_CONTROL, 0xe0); tmp2 = ad_read(sc, CS_LEFT_LINE_CONTROL); if (tmp2 == 0xe0) { /* * it's a CS4237B or another * clone supporting mode 3. * Let's determine which by * enabling extended registers * and checking X25. */ tmp2 = ad_xread(sc, CS_X_CHIP_VERSION); switch (tmp2 & X_CHIP_VERSIONF_CID) { case X_CHIP_CID_CS4236BB: sc->chip_name = "CS4236BrevB"; break; case X_CHIP_CID_CS4236B: sc->chip_name = "CS4236B"; break; case X_CHIP_CID_CS4237B: sc->chip_name = "CS4237B"; break; default: sc->chip_name = "CS4236B compatible"; DPRINTF(("cs4236: unknown mode 3 compatible codec, version 0x%02x\n", tmp2)); break; } sc->mode = 3; } /* restore volume control information */ ad_write(sc, CS_LEFT_LINE_CONTROL, tmp1); break; } } } } /* Wait for 1848 to init */ while(ADREAD(sc, AD1848_IADDR) & SP_IN_INIT) ; /* Wait for 1848 to autocal */ ADWRITE(sc, AD1848_IADDR, SP_TEST_AND_INIT); while(ADREAD(sc, AD1848_IDATA) & AUTO_CAL_IN_PROG) ; return 1; bad: return 0; } /* Unmap the I/O ports */ void ad1848_isa_unmap(isc) struct ad1848_isa_softc *isc; { struct ad1848_softc *sc = &isc->sc_ad1848; bus_space_unmap(sc->sc_iot, sc->sc_ioh, AD1848_NPORT); } /* * Attach hardware to driver, attach hardware driver to audio * pseudo-device driver . */ void ad1848_isa_attach(isc) struct ad1848_isa_softc *isc; { struct ad1848_softc *sc = &isc->sc_ad1848; int error; sc->sc_readreg = ad1848_isa_read; sc->sc_writereg = ad1848_isa_write; if (isc->sc_playdrq != -1) { isc->sc_play_maxsize = isa_dmamaxsize(isc->sc_ic, isc->sc_playdrq); error = isa_dmamap_create(isc->sc_ic, isc->sc_playdrq, isc->sc_play_maxsize, BUS_DMA_NOWAIT|BUS_DMA_ALLOCNOW); if (error) { printf("%s: can't create map for drq %d\n", sc->sc_dev.dv_xname, isc->sc_playdrq); return; } } if (isc->sc_recdrq != -1 && isc->sc_recdrq != isc->sc_playdrq) { isc->sc_rec_maxsize = isa_dmamaxsize(isc->sc_ic, isc->sc_recdrq); error = isa_dmamap_create(isc->sc_ic, isc->sc_recdrq, isc->sc_rec_maxsize, BUS_DMA_NOWAIT|BUS_DMA_ALLOCNOW); if (error) { printf("%s: can't create map for drq %d\n", sc->sc_dev.dv_xname, isc->sc_recdrq); isa_dmamap_destroy(isc->sc_ic, isc->sc_playdrq); return; } } ad1848_attach(sc); } int ad1848_isa_open(addr, flags) void *addr; int flags; { struct ad1848_isa_softc *isc = addr; struct ad1848_softc *sc = &isc->sc_ad1848; int error, state; DPRINTF(("ad1848_isa_open: sc=%p\n", isc)); state = 0; if (isc->sc_playdrq != -1) { error = isa_drq_alloc(isc->sc_ic, isc->sc_playdrq); if (error != 0) return EBUSY; state |= 1; } if (isc->sc_recdrq != -1 && isc->sc_recdrq != isc->sc_playdrq) { error = isa_drq_alloc(isc->sc_ic, isc->sc_recdrq); if (error != 0) goto bad; state |= 2; } #ifndef AUDIO_NO_POWER_CTL /* Power-up chip */ if (isc->powerctl) isc->powerctl(isc->powerarg, flags); #endif /* Init and mute wave output */ ad1848_mute_wave_output(sc, WAVE_MUTE2_INIT, 1); error = ad1848_open(sc, flags); if (error) { #ifndef AUDIO_NO_POWER_CTL if (isc->powerctl) isc->powerctl(isc->powerarg, 0); #endif goto bad; } DPRINTF(("ad1848_isa_open: opened\n")); return (0); bad: if (state & 1) isa_drq_free(isc->sc_ic, isc->sc_playdrq); if (state & 2) isa_drq_free(isc->sc_ic, isc->sc_recdrq); return (error); } /* * Close function is called at splaudio(). */ void ad1848_isa_close(addr) void *addr; { struct ad1848_isa_softc *isc = addr; struct ad1848_softc *sc = &isc->sc_ad1848; DPRINTF(("ad1848_isa_close: stop DMA\n")); ad1848_close(sc); #ifndef AUDIO_NO_POWER_CTL /* Power-down chip */ if (isc->powerctl) isc->powerctl(isc->powerarg, 0); #endif if (isc->sc_playdrq != -1) isa_drq_free(isc->sc_ic, isc->sc_playdrq); if (isc->sc_recdrq != -1 && isc->sc_recdrq != isc->sc_playdrq) isa_drq_free(isc->sc_ic, isc->sc_recdrq); } int ad1848_isa_trigger_input(addr, start, end, blksize, intr, arg, param) void *addr; void *start, *end; int blksize; void (*intr) __P((void *)); void *arg; struct audio_params *param; { struct ad1848_isa_softc *isc = addr; struct ad1848_softc *sc = &isc->sc_ad1848; u_int8_t reg; isa_dmastart(isc->sc_ic, isc->sc_recdrq, start, (char *)end - (char *)start, NULL, DMAMODE_READ | DMAMODE_LOOPDEMAND, BUS_DMA_NOWAIT); isc->sc_recrun = 1; if (sc->mode == 2 && isc->sc_playdrq != isc->sc_recdrq) { isc->sc_rintr = intr; isc->sc_rarg = arg; } else { isc->sc_pintr = intr; isc->sc_parg = arg; } /* * Calculate number of transfers. * Note that ADPCM is always transferred 4 bytes at at a time. */ blksize = (param->encoding == AUDIO_ENCODING_ADPCM) ? blksize / 4 - 1 : (blksize * 8) / (param->precision * param->factor * param->channels) - 1; if (sc->mode >= 2) { ad_write(sc, CS_LOWER_REC_CNT, blksize & 0xff); ad_write(sc, CS_UPPER_REC_CNT, blksize >> 8); } else { ad_write(sc, SP_LOWER_BASE_COUNT, blksize & 0xff); ad_write(sc, SP_UPPER_BASE_COUNT, blksize >> 8); } reg = ad_read(sc, SP_INTERFACE_CONFIG); ad_write(sc, SP_INTERFACE_CONFIG, CAPTURE_ENABLE|reg); return (0); } int ad1848_isa_trigger_output(addr, start, end, blksize, intr, arg, param) void *addr; void *start, *end; int blksize; void (*intr) __P((void *)); void *arg; struct audio_params *param; { struct ad1848_isa_softc *isc = addr; struct ad1848_softc *sc = &isc->sc_ad1848; u_int8_t reg; isa_dmastart(isc->sc_ic, isc->sc_playdrq, start, (char *)end - (char *)start, NULL, DMAMODE_WRITE | DMAMODE_LOOPDEMAND, BUS_DMA_NOWAIT); isc->sc_playrun = 1; isc->sc_pintr = intr; isc->sc_parg = arg; /* * Calculate number of transfers. * Note that ADPCM is always transferred 4 bytes at at a time. */ blksize = (param->encoding == AUDIO_ENCODING_ADPCM) ? blksize / 4 - 1 : (blksize * 8) / (param->precision * param->factor * param->channels) - 1; ad_write(sc, SP_LOWER_BASE_COUNT, blksize & 0xff); ad_write(sc, SP_UPPER_BASE_COUNT, blksize >> 8); /* Unmute wave output */ ad1848_mute_wave_output(sc, WAVE_MUTE2, 0); reg = ad_read(sc, SP_INTERFACE_CONFIG); ad_write(sc, SP_INTERFACE_CONFIG, PLAYBACK_ENABLE|reg); return (0); } int ad1848_isa_halt_input(addr) void *addr; { struct ad1848_isa_softc *isc = addr; struct ad1848_softc *sc = &isc->sc_ad1848; if (isc->sc_recrun) { ad1848_halt_input(sc); isa_dmaabort(isc->sc_ic, isc->sc_recdrq); isc->sc_recrun = 0; } return (0); } int ad1848_isa_halt_output(addr) void *addr; { struct ad1848_isa_softc *isc = addr; struct ad1848_softc *sc = &isc->sc_ad1848; if (isc->sc_playrun) { /* Mute wave output */ ad1848_mute_wave_output(sc, WAVE_MUTE2, 1); ad1848_halt_output(sc); isa_dmaabort(isc->sc_ic, isc->sc_playdrq); isc->sc_playrun = 0; } return (0); } int ad1848_isa_intr(arg) void *arg; { struct ad1848_isa_softc *isc = arg; struct ad1848_softc *sc = &isc->sc_ad1848; int retval = 0; u_char status; /* Get intr status */ status = ADREAD(sc, AD1848_STATUS); #ifdef AUDIO_DEBUG if (ad1848debug > 1) printf("ad1848_isa_intr: pintr=%p rintr=%p status=%x\n", isc->sc_pintr, isc->sc_rintr, status); #endif isc->sc_interrupts++; /* Handle interrupt */ if ((status & INTERRUPT_STATUS) != 0) { if (sc->mode == 2 && isc->sc_playdrq != isc->sc_recdrq) { status = ad_read(sc, CS_IRQ_STATUS); if ((status & CS_IRQ_PI) && isc->sc_playrun) { (*isc->sc_pintr)(isc->sc_parg); retval = 1; } if ((status & CS_IRQ_CI) && isc->sc_recrun) { (*isc->sc_rintr)(isc->sc_rarg); retval = 1; } } else { if (isc->sc_playrun) { (*isc->sc_pintr)(isc->sc_parg); retval = 1; } } /* Clear interrupt */ ADWRITE(sc, AD1848_STATUS, 0); } return(retval); } void * ad1848_isa_malloc(addr, direction, size, pool, flags) void *addr; int direction; size_t size; struct malloc_type *pool; int flags; { struct ad1848_isa_softc *isc = addr; int drq; if (direction == AUMODE_PLAY) drq = isc->sc_playdrq; else drq = isc->sc_recdrq; return (isa_malloc(isc->sc_ic, drq, size, pool, flags)); } void ad1848_isa_free(addr, ptr, pool) void *addr; void *ptr; struct malloc_type *pool; { isa_free(ptr, pool); } size_t ad1848_isa_round_buffersize(addr, direction, size) void *addr; int direction; size_t size; { struct ad1848_isa_softc *isc = addr; bus_size_t maxsize; if (direction == AUMODE_PLAY) maxsize = isc->sc_play_maxsize; else if (isc->sc_recdrq == isc->sc_playdrq) maxsize = isc->sc_play_maxsize; else maxsize = isc->sc_rec_maxsize; if (size > maxsize) size = maxsize; return (size); } paddr_t ad1848_isa_mappage(addr, mem, off, prot) void *addr; void *mem; off_t off; int prot; { return isa_mappage(mem, off, prot); } int ad1848_isa_get_props(addr) void *addr; { struct ad1848_isa_softc *isc = addr; return (AUDIO_PROP_MMAP | (isc->sc_playdrq != isc->sc_recdrq ? AUDIO_PROP_FULLDUPLEX : 0)); }