Aren
/
NetBSD
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
NetBSD/sys/arch/x68k/dev/intio.c

975 lines
23 KiB
C
Raw Blame History

/* $NetBSD: intio.c,v 1.6 1999/05/05 13:41:44 minoura Exp $ */
/*
*
* Copyright (c) 1998 NetBSD Foundation, Inc.
* 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 Charles D. Cranor and
* Washington University.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
*/
/*
* NetBSD/x68k internal I/O virtual bus.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/extent.h>
#include <vm/vm.h>
#include <machine/bus.h>
#include <machine/cpu.h>
#include <machine/frame.h>
#include <arch/x68k/dev/intiovar.h>
#include <arch/x68k/dev/mfp.h>
/*
* bus_space(9) interface
*/
static int intio_bus_space_map __P((bus_space_tag_t, bus_addr_t, bus_size_t, int, bus_space_handle_t *));
static void intio_bus_space_unmap __P((bus_space_tag_t, bus_space_handle_t, bus_size_t));
static int intio_bus_space_subregion __P((bus_space_tag_t, bus_space_handle_t, bus_size_t, bus_size_t, bus_space_handle_t *));
static struct x68k_bus_space intio_bus = {
#if 0
X68K_INTIO_BUS,
#endif
intio_bus_space_map, intio_bus_space_unmap, intio_bus_space_subregion,
x68k_bus_space_alloc, x68k_bus_space_free,
#if 0
x68k_bus_space_barrier,
#endif
0
};
/*
* bus_dma(9) interface
*/
#define INTIO_DMA_BOUNCE_THRESHOLD (16 * 1024 * 1024)
int _intio_bus_dmamap_create __P((bus_dma_tag_t, bus_size_t, int,
bus_size_t, bus_size_t, int, bus_dmamap_t *));
void _intio_bus_dmamap_destroy __P((bus_dma_tag_t, bus_dmamap_t));
int _intio_bus_dmamap_load __P((bus_dma_tag_t, bus_dmamap_t, void *,
bus_size_t, struct proc *, int));
int _intio_bus_dmamap_load_mbuf __P((bus_dma_tag_t, bus_dmamap_t,
struct mbuf *, int));
int _intio_bus_dmamap_load_uio __P((bus_dma_tag_t, bus_dmamap_t,
struct uio *, int));
int _intio_bus_dmamap_load_raw __P((bus_dma_tag_t, bus_dmamap_t,
bus_dma_segment_t *, int, bus_size_t, int));
void _intio_bus_dmamap_unload __P((bus_dma_tag_t, bus_dmamap_t));
void _intio_bus_dmamap_sync __P((bus_dma_tag_t, bus_dmamap_t,
bus_addr_t, bus_size_t, int));
int _intio_bus_dmamem_alloc __P((bus_dma_tag_t, bus_size_t, bus_size_t,
bus_size_t, bus_dma_segment_t *, int, int *, int));
int _intio_dma_alloc_bouncebuf __P((bus_dma_tag_t, bus_dmamap_t,
bus_size_t, int));
void _intio_dma_free_bouncebuf __P((bus_dma_tag_t, bus_dmamap_t));
struct x68k_bus_dma intio_bus_dma = {
INTIO_DMA_BOUNCE_THRESHOLD,
_intio_bus_dmamap_create,
_intio_bus_dmamap_destroy,
_intio_bus_dmamap_load,
_intio_bus_dmamap_load_mbuf,
_intio_bus_dmamap_load_uio,
_intio_bus_dmamap_load_raw,
_intio_bus_dmamap_unload,
_intio_bus_dmamap_sync,
_intio_bus_dmamem_alloc,
x68k_bus_dmamem_free,
x68k_bus_dmamem_map,
x68k_bus_dmamem_unmap,
x68k_bus_dmamem_mmap,
};
/*
* autoconf stuff
*/
static int intio_match __P((struct device *, struct cfdata *, void *));
static void intio_attach __P((struct device *, struct device *, void *));
static int intio_search __P((struct device *, struct cfdata *cf, void *));
static int intio_print __P((void *, const char *));
static void intio_alloc_system_ports __P((struct intio_softc*));
struct cfattach intio_ca = {
sizeof(struct intio_softc), intio_match, intio_attach
};
static struct intio_interrupt_vector {
intio_intr_handler_t iiv_handler;
void *iiv_arg;
int iiv_intrcntoff;
} iiv[256] = {{0,},};
extern struct cfdriver intio_cd;
/* used in console initialization */
extern int x68k_realconfig;
int x68k_config_found __P((struct cfdata *, struct device *,
void *, cfprint_t));
static struct cfdata *cfdata_intiobus = NULL;
/* other static functions */
static int scan_intrnames __P((const char *));
#ifdef DEBUG
int intio_debug = 0;
#endif
static int
intio_match(parent, cf, aux)
struct device *parent;
struct cfdata *cf;
void *aux; /* NULL */
{
if (strcmp(aux, intio_cd.cd_name) != 0)
return (0);
if (cf->cf_unit != 0)
return (0);
if (x68k_realconfig == 0)
cfdata_intiobus = cf; /* XXX */
return (1);
}
/* used in console initialization: configure only MFP */
static struct intio_attach_args initial_ia = {
&intio_bus,
0/*XXX*/,
"mfp", /* ia_name */
MFP_ADDR, /* ia_addr */
0x30, /* ia_size */
MFP_INTR, /* ia_intr */
-1 /* ia_dma */
-1, /* ia_dmaintr */
};
static void
intio_attach(parent, self, aux)
struct device *parent, *self;
void *aux; /* NULL */
{
struct intio_softc *sc = (struct intio_softc *)self;
struct intio_attach_args ia;
if (self == NULL) {
/* console only init */
x68k_config_found(cfdata_intiobus, NULL, &initial_ia, NULL);
return;
}
printf (" mapped at %8p\n", intiobase);
sc->sc_map = extent_create("intiomap",
PHYS_INTIODEV,
PHYS_INTIODEV + 0x400000,
M_DEVBUF, NULL, NULL, EX_NOWAIT);
intio_alloc_system_ports (sc);
sc->sc_bst = &intio_bus;
sc->sc_bst->x68k_bus_device = self;
sc->sc_dmat = &intio_bus_dma;
sc->sc_dmac = 0;
bzero(iiv, sizeof (struct intio_interrupt_vector) * 256);
ia.ia_bst = sc->sc_bst;
ia.ia_dmat = sc->sc_dmat;
config_search (intio_search, self, &ia);
}
static int
intio_search(parent, cf, aux)
struct device *parent;
struct cfdata *cf;
void *aux;
{
struct intio_attach_args *ia = aux;
struct intio_softc *sc = (struct intio_softc *)parent;
ia->ia_bst = sc->sc_bst;
ia->ia_dmat = sc->sc_dmat;
ia->ia_name = cf->cf_driver->cd_name;
ia->ia_addr = cf->cf_addr;
ia->ia_intr = cf->cf_intr;
ia->ia_dma = cf->cf_dma;
ia->ia_dmaintr = cf->cf_dmaintr;
if ((*cf->cf_attach->ca_match)(parent, cf, ia) > 0)
config_attach(parent, cf, ia, intio_print);
return (0);
}
static int
intio_print(aux, name)
void *aux;
const char *name;
{
struct intio_attach_args *ia = aux;
/* if (ia->ia_addr > 0) */
printf (" addr 0x%06x", ia->ia_addr);
if (ia->ia_intr > 0)
printf (" intr 0x%02x", ia->ia_intr);
if (ia->ia_dma >= 0) {
printf (" using DMA ch%d", ia->ia_dma);
if (ia->ia_dmaintr > 0)
printf (" intr 0x%02x and 0x%02x",
ia->ia_dmaintr, ia->ia_dmaintr+1);
}
return (QUIET);
}
/*
* intio memory map manager
*/
int
intio_map_allocate_region(parent, ia, flag)
struct device *parent;
struct intio_attach_args *ia;
enum intio_map_flag flag; /* INTIO_MAP_TESTONLY or INTIO_MAP_ALLOCATE */
{
struct intio_softc *sc = (struct intio_softc*) parent;
struct extent *map = sc->sc_map;
int r;
r = extent_alloc_region (map, ia->ia_addr, ia->ia_size, 0);
#ifdef DEBUG
if (intio_debug)
extent_print (map);
#endif
if (r == 0) {
if (flag != INTIO_MAP_ALLOCATE)
extent_free (map, ia->ia_addr, ia->ia_size, 0);
return 0;
}
return -1;
}
int
intio_map_free_region(parent, ia)
struct device *parent;
struct intio_attach_args *ia;
{
struct intio_softc *sc = (struct intio_softc*) parent;
struct extent *map = sc->sc_map;
extent_free (map, ia->ia_addr, ia->ia_size, 0);
#ifdef DEBUG
if (intio_debug)
extent_print (map);
#endif
return 0;
}
void
intio_alloc_system_ports(sc)
struct intio_softc *sc;
{
extent_alloc_region (sc->sc_map, INTIO_SYSPORT, 16, 0);
extent_alloc_region (sc->sc_map, INTIO_SICILIAN, 0x2000, 0);
}
/*
* intio bus space stuff.
*/
static int
intio_bus_space_map(t, bpa, size, flags, bshp)
bus_space_tag_t t;
bus_addr_t bpa;
bus_size_t size;
int flags;
bus_space_handle_t *bshp;
{
/*
* Intio bus is mapped permanently.
*/
*bshp = (bus_space_handle_t)
((u_int) bpa - PHYS_INTIODEV + intiobase);
/*
* Some devices are mapped on odd addresses only.
*/
if (flags & BUS_SPACE_MAP_SHIFTED)
*bshp += 0x80000001;
return (0);
}
static void
intio_bus_space_unmap(t, bsh, size)
bus_space_tag_t t;
bus_space_handle_t bsh;
bus_size_t size;
{
return;
}
static int
intio_bus_space_subregion(t, bsh, offset, size, nbshp)
bus_space_tag_t t;
bus_space_handle_t bsh;
bus_size_t offset, size;
bus_space_handle_t *nbshp;
{
*nbshp = bsh + offset;
return (0);
}
/*
* interrupt handler
*/
int
intio_intr_establish (vector, name, handler, arg)
int vector;
const char *name; /* XXX */
intio_intr_handler_t handler;
void *arg;
{
if (vector < 16)
panic ("Invalid interrupt vector");
if (iiv[vector].iiv_handler)
return EBUSY;
iiv[vector].iiv_handler = handler;
iiv[vector].iiv_arg = arg;
iiv[vector].iiv_intrcntoff = scan_intrnames(name);
return 0;
}
static int
scan_intrnames (name)
const char *name;
{
extern char intrnames[];
extern char eintrnames[];
int r = 0;
char *p = &intrnames[0];
for (;;) {
if (*p == 0) { /* new intr */
if (p + strlen(name) >= eintrnames)
panic ("Interrupt statics buffer overrun.");
strcpy (p, name);
break;
}
if (strcmp(p, name) == 0)
break;
r++;
while (*p++ != 0);
}
return r;
}
int
intio_intr_disestablish (vector, arg)
int vector;
void *arg;
{
if (iiv[vector].iiv_handler == 0 || iiv[vector].iiv_arg != arg)
return EINVAL;
iiv[vector].iiv_handler = 0;
iiv[vector].iiv_arg = 0;
return 0;
}
int
intio_intr (frame)
struct frame *frame;
{
int vector = frame->f_vector / 4;
extern int intrcnt[];
#if 0 /* this is not correct now */
/* CAUTION: HERE WE ARE IN SPLHIGH() */
/* LOWER TO APPROPRIATE IPL AT VERY FIRST IN THE HANDLER!! */
#endif
if (iiv[vector].iiv_handler == 0) {
printf ("Stray interrupt: %d type %x\n", vector, frame->f_format);
return 0;
}
intrcnt[iiv[vector].iiv_intrcntoff]++;
return (*(iiv[vector].iiv_handler)) (iiv[vector].iiv_arg);
}
/*
* Intio I/O controler interrupt
*/
static u_int8_t intio_ivec = 0;
void
intio_set_ivec (vec)
int vec;
{
vec &= 0xfc;
if (intio_ivec && intio_ivec != (vec & 0xfc))
panic ("Wrong interrupt vector for Sicilian.");
intio_ivec = vec;
intio_set_sicilian_ivec(vec);
}
/*
* intio bus dma stuff. stolen from arch/i386/isa/isa_machdep.c
*/
/*
* Create an INTIO DMA map.
*/
int
_intio_bus_dmamap_create(t, size, nsegments, maxsegsz, boundary, flags, dmamp)
bus_dma_tag_t t;
bus_size_t size;
int nsegments;
bus_size_t maxsegsz;
bus_size_t boundary;
int flags;
bus_dmamap_t *dmamp;
{
struct intio_dma_cookie *cookie;
bus_dmamap_t map;
int error, cookieflags;
void *cookiestore;
size_t cookiesize;
extern paddr_t avail_end;
/* Call common function to create the basic map. */
error = x68k_bus_dmamap_create(t, size, nsegments, maxsegsz, boundary,
flags, dmamp);
if (error)
return (error);
map = *dmamp;
map->x68k_dm_cookie = NULL;
cookiesize = sizeof(struct intio_dma_cookie);
/*
* INTIO only has 24-bits of address space. This means
* we can't DMA to pages over 16M. In order to DMA to
* arbitrary buffers, we use "bounce buffers" - pages
* in memory below the 16M boundary. On DMA reads,
* DMA happens to the bounce buffers, and is copied into
* the caller's buffer. On writes, data is copied into
* but bounce buffer, and the DMA happens from those
* pages. To software using the DMA mapping interface,
* this looks simply like a data cache.
*
* If we have more than 16M of RAM in the system, we may
* need bounce buffers. We check and remember that here.
*
* ...or, there is an opposite case. The most segments
* a transfer will require is (maxxfer / NBPG) + 1. If
* the caller can't handle that many segments (e.g. the
* DMAC), we may have to bounce it as well.
*/
if (avail_end <= t->_bounce_thresh)
/* Bouncing not necessary due to memory size. */
map->x68k_dm_bounce_thresh = 0;
cookieflags = 0;
if (map->x68k_dm_bounce_thresh != 0 ||
((map->x68k_dm_size / NBPG) + 1) > map->x68k_dm_segcnt) {
cookieflags |= ID_MIGHT_NEED_BOUNCE;
cookiesize += (sizeof(bus_dma_segment_t) * map->x68k_dm_segcnt);
}
/*
* Allocate our cookie.
*/
if ((cookiestore = malloc(cookiesize, M_DMAMAP,
(flags & BUS_DMA_NOWAIT) ? M_NOWAIT : M_WAITOK)) == NULL) {
error = ENOMEM;
goto out;
}
memset(cookiestore, 0, cookiesize);
cookie = (struct intio_dma_cookie *)cookiestore;
cookie->id_flags = cookieflags;
map->x68k_dm_cookie = cookie;
if (cookieflags & ID_MIGHT_NEED_BOUNCE) {
/*
* Allocate the bounce pages now if the caller
* wishes us to do so.
*/
if ((flags & BUS_DMA_ALLOCNOW) == 0)
goto out;
error = _intio_dma_alloc_bouncebuf(t, map, size, flags);
}
out:
if (error) {
if (map->x68k_dm_cookie != NULL)
free(map->x68k_dm_cookie, M_DMAMAP);
x68k_bus_dmamap_destroy(t, map);
}
return (error);
}
/*
* Destroy an INTIO DMA map.
*/
void
_intio_bus_dmamap_destroy(t, map)
bus_dma_tag_t t;
bus_dmamap_t map;
{
struct intio_dma_cookie *cookie = map->x68k_dm_cookie;
/*
* Free any bounce pages this map might hold.
*/
if (cookie->id_flags & ID_HAS_BOUNCE)
_intio_dma_free_bouncebuf(t, map);
free(cookie, M_DMAMAP);
x68k_bus_dmamap_destroy(t, map);
}
/*
* Load an INTIO DMA map with a linear buffer.
*/
int
_intio_bus_dmamap_load(t, map, buf, buflen, p, flags)
bus_dma_tag_t t;
bus_dmamap_t map;
void *buf;
bus_size_t buflen;
struct proc *p;
int flags;
{
struct intio_dma_cookie *cookie = map->x68k_dm_cookie;
int error;
/*
* Make sure that on error condition we return "no valid mappings."
*/
map->dm_mapsize = 0;
map->dm_nsegs = 0;
/*
* Try to load the map the normal way. If this errors out,
* and we can bounce, we will.
*/
error = x68k_bus_dmamap_load(t, map, buf, buflen, p, flags);
if (error == 0 ||
(error != 0 && (cookie->id_flags & ID_MIGHT_NEED_BOUNCE) == 0))
return (error);
/*
* Allocate bounce pages, if necessary.
*/
if ((cookie->id_flags & ID_HAS_BOUNCE) == 0) {
error = _intio_dma_alloc_bouncebuf(t, map, buflen, flags);
if (error)
return (error);
}
/*
* Cache a pointer to the caller's buffer and load the DMA map
* with the bounce buffer.
*/
cookie->id_origbuf = buf;
cookie->id_origbuflen = buflen;
cookie->id_buftype = ID_BUFTYPE_LINEAR;
error = x68k_bus_dmamap_load(t, map, cookie->id_bouncebuf, buflen,
p, flags);
if (error) {
/*
* Free the bounce pages, unless our resources
* are reserved for our exclusive use.
*/
if ((map->x68k_dm_flags & BUS_DMA_ALLOCNOW) == 0)
_intio_dma_free_bouncebuf(t, map);
return (error);
}
/* ...so _intio_bus_dmamap_sync() knows we're bouncing */
cookie->id_flags |= ID_IS_BOUNCING;
return (0);
}
/*
* Like _intio_bus_dmamap_load(), but for mbufs.
*/
int
_intio_bus_dmamap_load_mbuf(t, map, m0, flags)
bus_dma_tag_t t;
bus_dmamap_t map;
struct mbuf *m0;
int flags;
{
struct intio_dma_cookie *cookie = map->x68k_dm_cookie;
int error;
/*
* Make sure on error condition we return "no valid mappings."
*/
map->dm_mapsize = 0;
map->dm_nsegs = 0;
#ifdef DIAGNOSTIC
if ((m0->m_flags & M_PKTHDR) == 0)
panic("_intio_bus_dmamap_load_mbuf: no packet header");
#endif
if (m0->m_pkthdr.len > map->x68k_dm_size)
return (EINVAL);
/*
* Try to load the map the normal way. If this errors out,
* and we can bounce, we will.
*/
error = x68k_bus_dmamap_load_mbuf(t, map, m0, flags);
if (error == 0 ||
(error != 0 && (cookie->id_flags & ID_MIGHT_NEED_BOUNCE) == 0))
return (error);
/*
* Allocate bounce pages, if necessary.
*/
if ((cookie->id_flags & ID_HAS_BOUNCE) == 0) {
error = _intio_dma_alloc_bouncebuf(t, map, m0->m_pkthdr.len,
flags);
if (error)
return (error);
}
/*
* Cache a pointer to the caller's buffer and load the DMA map
* with the bounce buffer.
*/
cookie->id_origbuf = m0;
cookie->id_origbuflen = m0->m_pkthdr.len; /* not really used */
cookie->id_buftype = ID_BUFTYPE_MBUF;
error = x68k_bus_dmamap_load(t, map, cookie->id_bouncebuf,
m0->m_pkthdr.len, NULL, flags);
if (error) {
/*
* Free the bounce pages, unless our resources
* are reserved for our exclusive use.
*/
if ((map->x68k_dm_flags & BUS_DMA_ALLOCNOW) == 0)
_intio_dma_free_bouncebuf(t, map);
return (error);
}
/* ...so _intio_bus_dmamap_sync() knows we're bouncing */
cookie->id_flags |= ID_IS_BOUNCING;
return (0);
}
/*
* Like _intio_bus_dmamap_load(), but for uios.
*/
int
_intio_bus_dmamap_load_uio(t, map, uio, flags)
bus_dma_tag_t t;
bus_dmamap_t map;
struct uio *uio;
int flags;
{
panic("_intio_bus_dmamap_load_uio: not implemented");
}
/*
* Like _intio_bus_dmamap_load(), but for raw memory allocated with
* bus_dmamem_alloc().
*/
int
_intio_bus_dmamap_load_raw(t, map, segs, nsegs, size, flags)
bus_dma_tag_t t;
bus_dmamap_t map;
bus_dma_segment_t *segs;
int nsegs;
bus_size_t size;
int flags;
{
panic("_intio_bus_dmamap_load_raw: not implemented");
}
/*
* Unload an INTIO DMA map.
*/
void
_intio_bus_dmamap_unload(t, map)
bus_dma_tag_t t;
bus_dmamap_t map;
{
struct intio_dma_cookie *cookie = map->x68k_dm_cookie;
/*
* If we have bounce pages, free them, unless they're
* reserved for our exclusive use.
*/
if ((cookie->id_flags & ID_HAS_BOUNCE) &&
(map->x68k_dm_flags & BUS_DMA_ALLOCNOW) == 0)
_intio_dma_free_bouncebuf(t, map);
cookie->id_flags &= ~ID_IS_BOUNCING;
cookie->id_buftype = ID_BUFTYPE_INVALID;
/*
* Do the generic bits of the unload.
*/
x68k_bus_dmamap_unload(t, map);
}
/*
* Synchronize an INTIO DMA map.
*/
void
_intio_bus_dmamap_sync(t, map, offset, len, ops)
bus_dma_tag_t t;
bus_dmamap_t map;
bus_addr_t offset;
bus_size_t len;
int ops;
{
struct intio_dma_cookie *cookie = map->x68k_dm_cookie;
/*
* Mixing PRE and POST operations is not allowed.
*/
if ((ops & (BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE)) != 0 &&
(ops & (BUS_DMASYNC_POSTREAD|BUS_DMASYNC_POSTWRITE)) != 0)
panic("_intio_bus_dmamap_sync: mix PRE and POST");
#ifdef DIAGNOSTIC
if ((ops & (BUS_DMASYNC_PREWRITE|BUS_DMASYNC_POSTREAD)) != 0) {
if (offset >= map->dm_mapsize)
panic("_intio_bus_dmamap_sync: bad offset");
if (len == 0 || (offset + len) > map->dm_mapsize)
panic("_intio_bus_dmamap_sync: bad length");
}
#endif
/*
* If we're not bouncing, just return; nothing to do.
*/
if ((cookie->id_flags & ID_IS_BOUNCING) == 0)
return;
switch (cookie->id_buftype) {
case ID_BUFTYPE_LINEAR:
/*
* Nothing to do for pre-read.
*/
if (ops & BUS_DMASYNC_PREWRITE) {
/*
* Copy the caller's buffer to the bounce buffer.
*/
memcpy((char *)cookie->id_bouncebuf + offset,
(char *)cookie->id_origbuf + offset, len);
}
if (ops & BUS_DMASYNC_POSTREAD) {
/*
* Copy the bounce buffer to the caller's buffer.
*/
memcpy((char *)cookie->id_origbuf + offset,
(char *)cookie->id_bouncebuf + offset, len);
}
/*
* Nothing to do for post-write.
*/
break;
case ID_BUFTYPE_MBUF:
{
struct mbuf *m, *m0 = cookie->id_origbuf;
bus_size_t minlen, moff;
/*
* Nothing to do for pre-read.
*/
if (ops & BUS_DMASYNC_PREWRITE) {
/*
* Copy the caller's buffer to the bounce buffer.
*/
m_copydata(m0, offset, len,
(char *)cookie->id_bouncebuf + offset);
}
if (ops & BUS_DMASYNC_POSTREAD) {
/*
* Copy the bounce buffer to the caller's buffer.
*/
for (moff = offset, m = m0; m != NULL && len != 0;
m = m->m_next) {
/* Find the beginning mbuf. */
if (moff >= m->m_len) {
moff -= m->m_len;
continue;
}
/*
* Now at the first mbuf to sync; nail
* each one until we have exhausted the
* length.
*/
minlen = len < m->m_len - moff ?
len : m->m_len - moff;
memcpy(mtod(m, caddr_t) + moff,
(char *)cookie->id_bouncebuf + offset,
minlen);
moff = 0;
len -= minlen;
offset += minlen;
}
}
/*
* Nothing to do for post-write.
*/
break;
}
case ID_BUFTYPE_UIO:
panic("_intio_bus_dmamap_sync: ID_BUFTYPE_UIO");
break;
case ID_BUFTYPE_RAW:
panic("_intio_bus_dmamap_sync: ID_BUFTYPE_RAW");
break;
case ID_BUFTYPE_INVALID:
panic("_intio_bus_dmamap_sync: ID_BUFTYPE_INVALID");
break;
default:
printf("unknown buffer type %d\n", cookie->id_buftype);
panic("_intio_bus_dmamap_sync");
}
}
/*
* Allocate memory safe for INTIO DMA.
*/
int
_intio_bus_dmamem_alloc(t, size, alignment, boundary, segs, nsegs, rsegs, flags)
bus_dma_tag_t t;
bus_size_t size, alignment, boundary;
bus_dma_segment_t *segs;
int nsegs;
int *rsegs;
int flags;
{
paddr_t high;
extern paddr_t avail_end;
if (avail_end > INTIO_DMA_BOUNCE_THRESHOLD)
high = trunc_page(INTIO_DMA_BOUNCE_THRESHOLD);
else
high = trunc_page(avail_end);
return (x68k_bus_dmamem_alloc_range(t, size, alignment, boundary,
segs, nsegs, rsegs, flags, 0, high));
}
/**********************************************************************
* INTIO DMA utility functions
**********************************************************************/
int
_intio_dma_alloc_bouncebuf(t, map, size, flags)
bus_dma_tag_t t;
bus_dmamap_t map;
bus_size_t size;
int flags;
{
struct intio_dma_cookie *cookie = map->x68k_dm_cookie;
int error = 0;
cookie->id_bouncebuflen = round_page(size);
error = _intio_bus_dmamem_alloc(t, cookie->id_bouncebuflen,
NBPG, map->x68k_dm_boundary, cookie->id_bouncesegs,
map->x68k_dm_segcnt, &cookie->id_nbouncesegs, flags);
if (error)
goto out;
error = x68k_bus_dmamem_map(t, cookie->id_bouncesegs,
cookie->id_nbouncesegs, cookie->id_bouncebuflen,
(caddr_t *)&cookie->id_bouncebuf, flags);
out:
if (error) {
x68k_bus_dmamem_free(t, cookie->id_bouncesegs,
cookie->id_nbouncesegs);
cookie->id_bouncebuflen = 0;
cookie->id_nbouncesegs = 0;
} else {
cookie->id_flags |= ID_HAS_BOUNCE;
}
return (error);
}
void
_intio_dma_free_bouncebuf(t, map)
bus_dma_tag_t t;
bus_dmamap_t map;
{
struct intio_dma_cookie *cookie = map->x68k_dm_cookie;
x68k_bus_dmamem_unmap(t, cookie->id_bouncebuf,
cookie->id_bouncebuflen);
x68k_bus_dmamem_free(t, cookie->id_bouncesegs,
cookie->id_nbouncesegs);
cookie->id_bouncebuflen = 0;
cookie->id_nbouncesegs = 0;
cookie->id_flags &= ~ID_HAS_BOUNCE;
}
Reference in New Issue View Git Blame Copy Permalink