NetBSD-5.0.2/sys/arch/x68k/dev/intio.c
/* $NetBSD: intio.c,v 1.37 2008/06/25 08:14:59 isaki Exp $ */
/*-
* Copyright (c) 1998 The 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.
*
* 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.
*/
/*
* NetBSD/x68k internal I/O virtual bus.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: intio.c,v 1.37 2008/06/25 08:14:59 isaki Exp $");
#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 <uvm/uvm_extern.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(bus_space_tag_t, bus_addr_t, bus_size_t, int, bus_space_handle_t *);
static void intio_bus_space_unmap(bus_space_tag_t, bus_space_handle_t, bus_size_t);
static int intio_bus_space_subregion(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(bus_dma_tag_t, bus_size_t, int,
bus_size_t, bus_size_t, int, bus_dmamap_t *);
void _intio_bus_dmamap_destroy(bus_dma_tag_t, bus_dmamap_t);
int _intio_bus_dmamap_load(bus_dma_tag_t, bus_dmamap_t, void *,
bus_size_t, struct proc *, int);
int _intio_bus_dmamap_load_mbuf(bus_dma_tag_t, bus_dmamap_t,
struct mbuf *, int);
int _intio_bus_dmamap_load_uio(bus_dma_tag_t, bus_dmamap_t,
struct uio *, int);
int _intio_bus_dmamap_load_raw(bus_dma_tag_t, bus_dmamap_t,
bus_dma_segment_t *, int, bus_size_t, int);
void _intio_bus_dmamap_unload(bus_dma_tag_t, bus_dmamap_t);
void _intio_bus_dmamap_sync(bus_dma_tag_t, bus_dmamap_t,
bus_addr_t, bus_size_t, int);
int _intio_bus_dmamem_alloc(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(bus_dma_tag_t, bus_dmamap_t,
bus_size_t, int);
void _intio_dma_free_bouncebuf(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(device_t, cfdata_t, void *);
static void intio_attach(device_t, device_t, void *);
static int intio_search(device_t, cfdata_t, const int *, void *);
static int intio_print(void *, const char *);
static void intio_alloc_system_ports(struct intio_softc*);
CFATTACH_DECL_NEW(intio, sizeof(struct intio_softc),
intio_match, intio_attach, NULL, NULL);
extern struct cfdriver intio_cd;
static int intio_attached;
static struct intio_interrupt_vector {
intio_intr_handler_t iiv_handler;
void *iiv_arg;
struct evcnt *iiv_evcnt;
} iiv[256] = {{0,},};
/* used in console initialization */
extern int x68k_realconfig;
int x68k_config_found(struct cfdata *, struct device *, void *, cfprint_t);
static cfdata_t cfdata_intiobus = NULL;
#ifdef DEBUG
int intio_debug = 0;
#endif
static int
intio_match(device_t parent, cfdata_t cf, void *aux)
{
if (strcmp(aux, intio_cd.cd_name) != 0)
return (0);
if (intio_attached)
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(device_t parent, device_t self, void *aux)
{
struct intio_softc *sc = device_private(self);
struct intio_attach_args ia;
if (self == NULL) {
/* console only init */
x68k_config_found(cfdata_intiobus, NULL, &initial_ia, NULL);
return;
}
intio_attached = 1;
aprint_normal(" mapped at %8p\n", intiobase);
sc->sc_map = extent_create("intiomap",
PHYS_INTIODEV,
PHYS_INTIODEV + 0x400000,
M_DEVBUF, NULL, 0, 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;
memset(iiv, 0, sizeof(struct intio_interrupt_vector) * 256);
ia.ia_bst = sc->sc_bst;
ia.ia_dmat = sc->sc_dmat;
config_search_ia(intio_search, self, "intio", &ia);
}
static int
intio_search(device_t parent, cfdata_t cf, const int *ldesc, void *aux)
{
struct intio_softc *sc = device_private(parent);
struct intio_attach_args *ia = aux;
ia->ia_bst = sc->sc_bst;
ia->ia_dmat = sc->sc_dmat;
ia->ia_name = cf->cf_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 (config_match(parent, cf, ia) > 0)
config_attach(parent, cf, ia, intio_print);
return (0);
}
static int
intio_print(void *aux, const char *name)
{
struct intio_attach_args *ia = aux;
/* if (ia->ia_addr > 0) */
aprint_normal(" addr 0x%06x", ia->ia_addr);
if (ia->ia_intr > 0)
aprint_normal(" intr 0x%02x", ia->ia_intr);
if (ia->ia_dma >= 0) {
aprint_normal(" using DMA ch%d", ia->ia_dma);
if (ia->ia_dmaintr > 0)
aprint_normal(" intr 0x%02x and 0x%02x",
ia->ia_dmaintr, ia->ia_dmaintr+1);
}
return (QUIET);
}
/*
* intio memory map manager
*/
int
intio_map_allocate_region(device_t parent, struct intio_attach_args *ia,
enum intio_map_flag flag)
{
struct intio_softc *sc = device_private(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(device_t parent, struct intio_attach_args *ia)
{
struct intio_softc *sc = device_private(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(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(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 or even addresses only.
*/
if ((flags & BUS_SPACE_MAP_SHIFTED_MASK) == BUS_SPACE_MAP_SHIFTED_ODD)
*bshp += 0x80000001;
if ((flags & BUS_SPACE_MAP_SHIFTED_MASK) == BUS_SPACE_MAP_SHIFTED_EVEN)
*bshp += 0x80000000;
return (0);
}
static void
intio_bus_space_unmap(bus_space_tag_t t, bus_space_handle_t bsh,
bus_size_t size)
{
return;
}
static int
intio_bus_space_subregion(bus_space_tag_t t, bus_space_handle_t bsh,
bus_size_t offset, bus_size_t size, bus_space_handle_t *nbshp)
{
*nbshp = bsh + offset;
return (0);
}
/*
* interrupt handler
*/
int
intio_intr_establish(int vector, const char *name, intio_intr_handler_t handler,
void *arg)
{
return intio_intr_establish_ext(vector, name, "intr", handler, arg);
}
int
intio_intr_establish_ext(int vector, const char *name1, const char *name2,
intio_intr_handler_t handler, void *arg)
{
struct evcnt *evcnt;
if (vector < 16)
panic("Invalid interrupt vector");
if (iiv[vector].iiv_handler)
return EBUSY;
evcnt = malloc(sizeof(*evcnt), M_DEVBUF, M_NOWAIT);
if (evcnt == NULL)
return ENOMEM;
evcnt_attach_dynamic(evcnt, EVCNT_TYPE_INTR, NULL, name1, name2);
iiv[vector].iiv_handler = handler;
iiv[vector].iiv_arg = arg;
iiv[vector].iiv_evcnt = evcnt;
return 0;
}
int
intio_intr_disestablish(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;
evcnt_detach(iiv[vector].iiv_evcnt);
free(iiv[vector].iiv_evcnt, M_DEVBUF);
return 0;
}
int
intio_intr(struct frame *frame)
{
int vector = frame->f_vector / 4;
#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, pc %x\n",
vector, frame->f_format, frame->f_pc);
return 0;
}
iiv[vector].iiv_evcnt->ev_count++;
return (*(iiv[vector].iiv_handler))(iiv[vector].iiv_arg);
}
/*
* Intio I/O controller interrupt
*/
static u_int8_t intio_ivec = 0;
void
intio_set_ivec(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(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 / PAGE_SIZE) + 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 / PAGE_SIZE) + 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(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(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(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(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(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(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(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, char *) + 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(bus_dma_tag_t t, bus_size_t size, bus_size_t alignment,
bus_size_t 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(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,
PAGE_SIZE, 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,
(void **)&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(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;
}