diff options
author | dfr <dfr@FreeBSD.org> | 1999-06-05 13:30:13 +0000 |
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committer | dfr <dfr@FreeBSD.org> | 1999-06-05 13:30:13 +0000 |
commit | 5d698a672d010c9c1953515f78b626af1f2b23c8 (patch) | |
tree | 2c54ebf6283cdabc63a25afd53742d93bbe5eba8 /sys/alpha/isa | |
parent | b5f25689234ab13b40ae7c1bfdd723ac8c3dc9d3 (diff) | |
download | FreeBSD-src-5d698a672d010c9c1953515f78b626af1f2b23c8.zip FreeBSD-src-5d698a672d010c9c1953515f78b626af1f2b23c8.tar.gz |
* Implement ISA dma (only for CIA now but more chipsets to follow).
* Port the fd driver to alpha.
Diffstat (limited to 'sys/alpha/isa')
-rw-r--r-- | sys/alpha/isa/isa.c | 36 | ||||
-rw-r--r-- | sys/alpha/isa/isa_dma.c | 487 |
2 files changed, 514 insertions, 9 deletions
diff --git a/sys/alpha/isa/isa.c b/sys/alpha/isa/isa.c index 3878e6a..920751f 100644 --- a/sys/alpha/isa/isa.c +++ b/sys/alpha/isa/isa.c @@ -23,7 +23,7 @@ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * - * $Id: isa.c,v 1.15 1999/05/18 20:43:49 dfr Exp $ + * $Id: isa.c,v 1.16 1999/05/22 15:18:15 dfr Exp $ */ #include <sys/param.h> @@ -44,6 +44,7 @@ #include <machine/resource.h> static struct rman isa_irq_rman; +static struct rman isa_drq_rman; static void isa_intr_enable(int irq) @@ -112,6 +113,14 @@ isa_init_intr(void) || rman_manage_region(&isa_irq_rman, 3, 15)) panic("isa_probe isa_irq_rman"); + isa_drq_rman.rm_start = 0; + isa_drq_rman.rm_end = 7; + isa_drq_rman.rm_type = RMAN_ARRAY; + isa_drq_rman.rm_descr = "ISA DMA request lines"; + if (rman_init(&isa_drq_rman) + || rman_manage_region(&isa_drq_rman, 0, 7)) + panic("isa_probe isa_drq_rman"); + /* mask all isa interrupts */ outb(IO_ICU1+1, 0xff); outb(IO_ICU2+1, 0xff); @@ -150,8 +159,8 @@ isa_alloc_resource(device_t bus, device_t child, int type, int *rid, { /* * Consider adding a resource definition. We allow rid 0-1 for - * irq, drq and memory and rid 0-7 for ports which is sufficient for - * isapnp. + * irq and drq, 0-3 for memory and 0-7 for ports which is + * sufficient for isapnp. */ int passthrough = (device_get_parent(child) != bus); int isdefault = (start == 0UL && end == ~0UL); @@ -165,7 +174,11 @@ isa_alloc_resource(device_t bus, device_t child, int type, int *rid, if (!rle) { if (*rid < 0) return 0; - if (type != SYS_RES_IOPORT && *rid > 1) + if (type == SYS_RES_IRQ && *rid > 1) + return 0; + if (type == SYS_RES_DRQ && *rid > 1) + return 0; + if (type != SYS_RES_MEMORY && *rid > 3) return 0; if (type == SYS_RES_IOPORT && *rid > 7) return 0; @@ -173,13 +186,13 @@ isa_alloc_resource(device_t bus, device_t child, int type, int *rid, } } - if (type != SYS_RES_IRQ) + if (type != SYS_RES_IRQ && type != SYS_RES_DRQ) return resource_list_alloc(bus, child, type, rid, start, end, count, flags); if (!passthrough) { rl = device_get_ivars(child); - rle = resource_list_find(rl, SYS_RES_IRQ, *rid); + rle = resource_list_find(rl, type, *rid); if (!rle) return 0; if (rle->res) @@ -190,11 +203,16 @@ isa_alloc_resource(device_t bus, device_t child, int type, int *rid, } } - res = isa_alloc_intr(bus, child, start); - + if (type == SYS_RES_IRQ) + res = rman_reserve_resource(&isa_irq_rman, start, start, 1, + 0, child); + else + res = rman_reserve_resource(&isa_drq_rman, start, start, 1, + 0, child); + if (res && !passthrough) { rl = device_get_ivars(child); - rle = resource_list_find(rl, SYS_RES_IRQ, *rid); + rle = resource_list_find(rl, type, *rid); rle->start = rman_get_start(res); rle->end = rman_get_end(res); rle->count = 1; diff --git a/sys/alpha/isa/isa_dma.c b/sys/alpha/isa/isa_dma.c new file mode 100644 index 0000000..2cb3e2c --- /dev/null +++ b/sys/alpha/isa/isa_dma.c @@ -0,0 +1,487 @@ +/*- + * 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 + * from: isa_dma.c,v 1.3 1999/05/09 23:56:00 peter Exp $ + * $Id$ + */ + +/* + * code to manage AT bus + * + * 92/08/18 Frank P. MacLachlan (fpm@crash.cts.com): + * Fixed uninitialized variable problem and added code to deal + * with DMA page boundaries in isa_dmarangecheck(). Fixed word + * mode DMA count compution and reorganized DMA setup code in + * isa_dmastart() + */ + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/buf.h> /* B_READ and B_RAW */ +#include <sys/malloc.h> +#include <sys/bus.h> +#include <vm/vm.h> +#include <vm/vm_param.h> +#include <vm/pmap.h> +#include <isa/isareg.h> +#include <isa/isavar.h> +#include <i386/isa/ic/i8237.h> +#include <machine/bus.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 */ +#define DMA1_RESET (IO_DMA1 + 1*13) /* reset */ + +/* +** 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 */ +#define DMA2_RESET (IO_DMA2 + 2*13) /* reset */ + +static bus_dma_tag_t dma_tag[8]; +static bus_dmamap_t dma_map[8]; +static u_int8_t dma_busy = 0; /* Used in isa_dmastart() */ +static u_int8_t dma_inuse = 0; /* User for acquire/release */ +static u_int8_t dma_auto_mode = 0; + +#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; +{ + static int initted = 0; + bus_addr_t boundary = chan >= 4 ? 0x20000 : 0x10000; + + if (!initted) { + /* + * Reset the DMA hardware. + */ + outb(DMA1_RESET, 0); + outb(DMA2_RESET, 0); + isa_dmacascade(4); + + initted = 1; + } + +#ifdef DIAGNOSTIC + if (chan & ~VALID_DMA_MASK) + panic("isa_dmainit: channel out of range"); + + if (dma_tag[chan] || dma_map[chan]) + panic("isa_dmainit: impossible request"); +#endif + + if (bus_dma_tag_create(/*parent*/NULL, + /*alignment*/2, + /*boundary*/boundary, + /*lowaddr*/BUS_SPACE_MAXADDR_32BIT, + /*highaddr*/BUS_SPACE_MAXADDR, + /*filter*/NULL, /*filterarg*/NULL, + /*maxsize*/bouncebufsize, + /*nsegments*/1, /*maxsegz*/0x3ffff, + /*flags*/BUS_DMA_ISA, + &dma_tag[chan]) != 0) { + panic("isa_dmainit: unable to create dma tag\n"); + } + + if (bus_dmamap_create(dma_tag[chan], 0, &dma_map[chan])) { + panic("isa_dmainit: unable to create dma map\n"); + } + +} + +/* + * Register a DMA channel's usage. Usually called from a device driver + * in open() or during its initialization. + */ +int +isa_dma_acquire(chan) + int chan; +{ +#ifdef DIAGNOSTIC + if (chan & ~VALID_DMA_MASK) + panic("isa_dma_acquire: channel out of range"); +#endif + + if (dma_inuse & (1 << chan)) { + printf("isa_dma_acquire: channel %d already in use\n", chan); + return (EBUSY); + } + dma_inuse |= (1 << chan); + dma_auto_mode &= ~(1 << chan); + + return (0); +} + +/* + * Unregister a DMA channel's usage. Usually called from a device driver + * during close() or during its shutdown. + */ +void +isa_dma_release(chan) + int chan; +{ +#ifdef DIAGNOSTIC + if (chan & ~VALID_DMA_MASK) + panic("isa_dma_release: channel out of range"); + + if ((dma_inuse & (1 << chan)) == 0) + printf("isa_dma_release: channel %d not in use\n", chan); +#endif + + if (dma_busy & (1 << chan)) { + dma_busy &= ~(1 << chan); + /* + * XXX We should also do "dma_bounced &= (1 << chan);" + * because we are acting on behalf of isa_dmadone() which + * was not called to end the last DMA operation. This does + * not matter now, but it may in the future. + */ + } + + dma_inuse &= ~(1 << chan); + dma_auto_mode &= ~(1 << chan); +} + +/* + * isa_dmacascade(): program 8237 DMA controller channel to accept + * external dma control by a board. + */ +void +isa_dmacascade(chan) + int chan; +{ +#ifdef DIAGNOSTIC + if (chan & ~VALID_DMA_MASK) + panic("isa_dmacascade: channel out of range"); +#endif + + /* set dma channel mode, and set dma channel mode */ + if ((chan & 4) == 0) { + outb(DMA1_MODE, DMA37MD_CASCADE | chan); + outb(DMA1_SMSK, chan); + } else { + outb(DMA2_MODE, DMA37MD_CASCADE | (chan & 3)); + outb(DMA2_SMSK, chan & 3); + } +} + +/* + * isa_dmastart(): program 8237 DMA controller channel. + */ + +struct isa_dmastart_arg { + int chan; + int flags; +}; + +static void isa_dmastart_cb(void *arg, bus_dma_segment_t *segs, int nseg, + int error) +{ + int chan = ((struct isa_dmastart_arg *) arg)->chan; + int flags = ((struct isa_dmastart_arg *) arg)->flags; + bus_addr_t phys = segs->ds_addr; + int nbytes = segs->ds_len; + int waport; + + if (nseg != 1) + panic("isa_dmastart: transfer mapping not contiguous"); + + if ((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_dmastart(int flags, caddr_t addr, u_int nbytes, int chan) +{ + struct isa_dmastart_arg args; + +#ifdef DIAGNOSTIC + if (chan & ~VALID_DMA_MASK) + panic("isa_dmastart: channel out of range"); + + if ((chan < 4 && nbytes > (1<<16)) + || (chan >= 4 && (nbytes > (1<<17) || (uintptr_t)addr & 1))) + panic("isa_dmastart: impossible request"); + + if ((dma_inuse & (1 << chan)) == 0) + printf("isa_dmastart: channel %d not acquired\n", chan); +#endif + +#if 0 + /* + * XXX This should be checked, but drivers like ad1848 only call + * isa_dmastart() once because they use Auto DMA mode. If we + * leave this in, drivers that do this will print this continuously. + */ + if (dma_busy & (1 << chan)) + printf("isa_dmastart: channel %d busy\n", chan); +#endif + + if (!dma_tag || !dma_map[chan]) + panic("isa_dmastart: called without isa_dmainit"); + + dma_busy |= (1 << chan); + + if (flags & B_RAW) { + dma_auto_mode |= (1 << chan); + } else { + dma_auto_mode &= ~(1 << chan); + } + + /* + * Freeze dma while updating registers. + */ + outb(chan & 4 ? DMA2_SMSK : DMA1_SMSK, (chan & 3) | 4); + + args.chan = chan; + args.flags = flags; + bus_dmamap_load(dma_tag[chan], dma_map[chan], addr, nbytes, + isa_dmastart_cb, &args, 0); +} + +void +isa_dmadone(int flags, caddr_t addr, int nbytes, int chan) +{ +#ifdef DIAGNOSTIC + if (chan & ~VALID_DMA_MASK) + panic("isa_dmadone: channel out of range"); + + if ((dma_inuse & (1 << chan)) == 0) + printf("isa_dmadone: channel %d not acquired\n", chan); +#endif + + if (((dma_busy & (1 << chan)) == 0) && + (dma_auto_mode & (1 << chan)) == 0 ) + printf("isa_dmadone: channel %d not busy\n", chan); + + if ((dma_auto_mode & (1 << chan)) == 0) { + outb(chan & 4 ? DMA2_SMSK : DMA1_SMSK, (chan & 3) | 4); + bus_dmamap_unload(dma_tag[chan], dma_map[chan]); + } + + dma_busy &= ~(1 << chan); +} + +/* + * Query the progress of a transfer on a DMA channel. + * + * To avoid having to interrupt a transfer in progress, we sample + * each of the high and low databytes twice, and apply the following + * logic to determine the correct count. + * + * Reads are performed with interrupts disabled, thus it is to be + * expected that the time between reads is very small. At most + * one rollover in the low count byte can be expected within the + * four reads that are performed. + * + * There are three gaps in which a rollover can occur : + * + * - read low1 + * gap1 + * - read high1 + * gap2 + * - read low2 + * gap3 + * - read high2 + * + * If a rollover occurs in gap1 or gap2, the low2 value will be + * greater than the low1 value. In this case, low2 and high2 are a + * corresponding pair. + * + * In any other case, low1 and high1 can be considered to be correct. + * + * The function returns the number of bytes remaining in the transfer, + * or -1 if the channel requested is not active. + * + */ +int +isa_dmastatus(int chan) +{ + u_long cnt = 0; + int ffport, waport; + u_long low1, high1, low2, high2; + int s; + + /* channel active? */ + if ((dma_inuse & (1 << chan)) == 0) { + printf("isa_dmastatus: channel %d not active\n", chan); + return(-1); + } + /* channel busy? */ + + if (((dma_busy & (1 << chan)) == 0) && + (dma_auto_mode & (1 << chan)) == 0 ) { + printf("chan %d not busy\n", chan); + return -2 ; + } + if (chan < 4) { /* low DMA controller */ + ffport = DMA1_FFC; + waport = DMA1_CHN(chan) + 1; + } else { /* high DMA controller */ + ffport = DMA2_FFC; + waport = DMA2_CHN(chan - 4) + 2; + } + + s = splhigh(); /* no interrupts Mr Jones! */ + outb(ffport, 0); /* clear register LSB flipflop */ + low1 = inb(waport); + high1 = inb(waport); + outb(ffport, 0); /* clear again */ + low2 = inb(waport); + high2 = inb(waport); + splx(s); /* enable interrupts again */ + + /* + * Now decide if a wrap has tried to skew our results. + * Note that after TC, the count will read 0xffff, while we want + * to return zero, so we add and then mask to compensate. + */ + if (low1 >= low2) { + cnt = (low1 + (high1 << 8) + 1) & 0xffff; + } else { + cnt = (low2 + (high2 << 8) + 1) & 0xffff; + } + + if (chan >= 4) /* high channels move words */ + cnt *= 2; + return(cnt); +} + +/* + * Stop a DMA transfer currently in progress. + */ +int +isa_dmastop(int chan) +{ + if ((dma_inuse & (1 << chan)) == 0) + printf("isa_dmastop: channel %d not acquired\n", chan); + + if (((dma_busy & (1 << chan)) == 0) && + ((dma_auto_mode & (1 << chan)) == 0)) { + printf("chan %d not busy\n", chan); + return -2 ; + } + + if ((chan & 4) == 0) { + outb(DMA1_SMSK, (chan & 3) | 4 /* disable mask */); + } else { + outb(DMA2_SMSK, (chan & 3) | 4 /* disable mask */); + } + return(isa_dmastatus(chan)); +} |