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| Current File : //sys/sparc64/sparc64/bus_machdep.c |
/*-
* Copyright (c) 1996, 1997, 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
* NASA Ames Research Center.
*
* 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.
*/
/*-
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This software was developed by the Computer Systems Engineering group
* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
* contributed to Berkeley.
*
* 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.
* 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.
*/
/*-
* Copyright (c) 1997, 1998 Justin T. Gibbs.
* All rights reserved.
* Copyright 2001 by Thomas Moestl <tmm@FreeBSD.org>. 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,
* without modification, immediately at the beginning of the file.
* 2. 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 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.
*
* from: @(#)machdep.c 8.6 (Berkeley) 1/14/94
* from: NetBSD: machdep.c,v 1.221 2008/04/28 20:23:37 martin Exp
* and
* from: FreeBSD: src/sys/i386/i386/busdma_machdep.c,v 1.24 2001/08/15
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/sparc64/sparc64/bus_machdep.c 230687 2012-01-28 23:53:06Z marius $");
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/rman.h>
#include <sys/smp.h>
#include <sys/systm.h>
#include <sys/uio.h>
#include <vm/vm.h>
#include <vm/vm_extern.h>
#include <vm/vm_kern.h>
#include <vm/vm_page.h>
#include <vm/vm_param.h>
#include <vm/vm_map.h>
#include <machine/asi.h>
#include <machine/atomic.h>
#include <machine/bus.h>
#include <machine/bus_private.h>
#include <machine/cache.h>
#include <machine/smp.h>
#include <machine/tlb.h>
static void nexus_bus_barrier(bus_space_tag_t, bus_space_handle_t,
bus_size_t, bus_size_t, int);
/* ASIs for bus access */
const int bus_type_asi[] = {
ASI_PHYS_BYPASS_EC_WITH_EBIT, /* nexus */
ASI_PHYS_BYPASS_EC_WITH_EBIT, /* SBus */
ASI_PHYS_BYPASS_EC_WITH_EBIT_L, /* PCI configuration space */
ASI_PHYS_BYPASS_EC_WITH_EBIT_L, /* PCI memory space */
ASI_PHYS_BYPASS_EC_WITH_EBIT_L, /* PCI I/O space */
0
};
const int bus_stream_asi[] = {
ASI_PHYS_BYPASS_EC_WITH_EBIT, /* nexus */
ASI_PHYS_BYPASS_EC_WITH_EBIT, /* SBus */
ASI_PHYS_BYPASS_EC_WITH_EBIT, /* PCI configuration space */
ASI_PHYS_BYPASS_EC_WITH_EBIT, /* PCI memory space */
ASI_PHYS_BYPASS_EC_WITH_EBIT, /* PCI I/O space */
0
};
/*
* Convenience function for manipulating driver locks from busdma (during
* busdma_swi, for example). Drivers that don't provide their own locks
* should specify &Giant to dmat->lockfuncarg. Drivers that use their own
* non-mutex locking scheme don't have to use this at all.
*/
void
busdma_lock_mutex(void *arg, bus_dma_lock_op_t op)
{
struct mtx *dmtx;
dmtx = (struct mtx *)arg;
switch (op) {
case BUS_DMA_LOCK:
mtx_lock(dmtx);
break;
case BUS_DMA_UNLOCK:
mtx_unlock(dmtx);
break;
default:
panic("Unknown operation 0x%x for busdma_lock_mutex!", op);
}
}
/*
* dflt_lock should never get called. It gets put into the dma tag when
* lockfunc == NULL, which is only valid if the maps that are associated
* with the tag are meant to never be defered.
* XXX Should have a way to identify which driver is responsible here.
*/
static void
dflt_lock(void *arg, bus_dma_lock_op_t op)
{
panic("driver error: busdma dflt_lock called");
}
/*
* Allocate a device specific dma_tag.
*/
int
bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t alignment,
bus_size_t boundary, bus_addr_t lowaddr, bus_addr_t highaddr,
bus_dma_filter_t *filter, void *filterarg, bus_size_t maxsize,
int nsegments, bus_size_t maxsegsz, int flags, bus_dma_lock_t *lockfunc,
void *lockfuncarg, bus_dma_tag_t *dmat)
{
bus_dma_tag_t newtag;
/* Return a NULL tag on failure */
*dmat = NULL;
/* Enforce the usage of BUS_GET_DMA_TAG(). */
if (parent == NULL)
panic("%s: parent DMA tag NULL", __func__);
newtag = (bus_dma_tag_t)malloc(sizeof(*newtag), M_DEVBUF, M_NOWAIT);
if (newtag == NULL)
return (ENOMEM);
/*
* The method table pointer and the cookie need to be taken over from
* the parent.
*/
newtag->dt_cookie = parent->dt_cookie;
newtag->dt_mt = parent->dt_mt;
newtag->dt_parent = parent;
newtag->dt_alignment = alignment;
newtag->dt_boundary = boundary;
newtag->dt_lowaddr = trunc_page((vm_offset_t)lowaddr) + (PAGE_SIZE - 1);
newtag->dt_highaddr = trunc_page((vm_offset_t)highaddr) +
(PAGE_SIZE - 1);
newtag->dt_filter = filter;
newtag->dt_filterarg = filterarg;
newtag->dt_maxsize = maxsize;
newtag->dt_nsegments = nsegments;
newtag->dt_maxsegsz = maxsegsz;
newtag->dt_flags = flags;
newtag->dt_ref_count = 1; /* Count ourselves */
newtag->dt_map_count = 0;
if (lockfunc != NULL) {
newtag->dt_lockfunc = lockfunc;
newtag->dt_lockfuncarg = lockfuncarg;
} else {
newtag->dt_lockfunc = dflt_lock;
newtag->dt_lockfuncarg = NULL;
}
newtag->dt_segments = NULL;
/* Take into account any restrictions imposed by our parent tag. */
newtag->dt_lowaddr = ulmin(parent->dt_lowaddr, newtag->dt_lowaddr);
newtag->dt_highaddr = ulmax(parent->dt_highaddr, newtag->dt_highaddr);
if (newtag->dt_boundary == 0)
newtag->dt_boundary = parent->dt_boundary;
else if (parent->dt_boundary != 0)
newtag->dt_boundary = ulmin(parent->dt_boundary,
newtag->dt_boundary);
atomic_add_int(&parent->dt_ref_count, 1);
if (newtag->dt_boundary > 0)
newtag->dt_maxsegsz = ulmin(newtag->dt_maxsegsz,
newtag->dt_boundary);
*dmat = newtag;
return (0);
}
int
bus_dma_tag_destroy(bus_dma_tag_t dmat)
{
bus_dma_tag_t parent;
if (dmat != NULL) {
if (dmat->dt_map_count != 0)
return (EBUSY);
while (dmat != NULL) {
parent = dmat->dt_parent;
atomic_subtract_int(&dmat->dt_ref_count, 1);
if (dmat->dt_ref_count == 0) {
if (dmat->dt_segments != NULL)
free(dmat->dt_segments, M_DEVBUF);
free(dmat, M_DEVBUF);
/*
* Last reference count, so
* release our reference
* count on our parent.
*/
dmat = parent;
} else
dmat = NULL;
}
}
return (0);
}
/* Allocate/free a tag, and do the necessary management work. */
int
sparc64_dma_alloc_map(bus_dma_tag_t dmat, bus_dmamap_t *mapp)
{
if (dmat->dt_segments == NULL) {
dmat->dt_segments = (bus_dma_segment_t *)malloc(
sizeof(bus_dma_segment_t) * dmat->dt_nsegments, M_DEVBUF,
M_NOWAIT);
if (dmat->dt_segments == NULL)
return (ENOMEM);
}
*mapp = malloc(sizeof(**mapp), M_DEVBUF, M_NOWAIT | M_ZERO);
if (*mapp == NULL)
return (ENOMEM);
SLIST_INIT(&(*mapp)->dm_reslist);
dmat->dt_map_count++;
return (0);
}
void
sparc64_dma_free_map(bus_dma_tag_t dmat, bus_dmamap_t map)
{
free(map, M_DEVBUF);
dmat->dt_map_count--;
}
static int
nexus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp)
{
return (sparc64_dma_alloc_map(dmat, mapp));
}
static int
nexus_dmamap_destroy(bus_dma_tag_t dmat, bus_dmamap_t map)
{
sparc64_dma_free_map(dmat, map);
return (0);
}
/*
* Utility function to load a linear buffer. lastaddrp holds state
* between invocations (for multiple-buffer loads). segp contains
* the starting segment on entrace, and the ending segment on exit.
* first indicates if this is the first invocation of this function.
*/
static int
_nexus_dmamap_load_buffer(bus_dma_tag_t dmat, void *buf, bus_size_t buflen,
struct thread *td, int flags, bus_addr_t *lastaddrp,
bus_dma_segment_t *segs, int *segp, int first)
{
bus_size_t sgsize;
bus_addr_t curaddr, lastaddr, baddr, bmask;
vm_offset_t vaddr = (vm_offset_t)buf;
int seg;
pmap_t pmap;
if (td != NULL)
pmap = vmspace_pmap(td->td_proc->p_vmspace);
else
pmap = NULL;
lastaddr = *lastaddrp;
bmask = ~(dmat->dt_boundary - 1);
for (seg = *segp; buflen > 0 ; ) {
/*
* Get the physical address for this segment.
*/
if (pmap)
curaddr = pmap_extract(pmap, vaddr);
else
curaddr = pmap_kextract(vaddr);
/*
* Compute the segment size, and adjust counts.
*/
sgsize = PAGE_SIZE - ((u_long)curaddr & PAGE_MASK);
if (sgsize > dmat->dt_maxsegsz)
sgsize = dmat->dt_maxsegsz;
if (buflen < sgsize)
sgsize = buflen;
/*
* Make sure we don't cross any boundaries.
*/
if (dmat->dt_boundary > 0) {
baddr = (curaddr + dmat->dt_boundary) & bmask;
if (sgsize > (baddr - curaddr))
sgsize = (baddr - curaddr);
}
/*
* Insert chunk into a segment, coalescing with
* previous segment if possible.
*/
if (first) {
segs[seg].ds_addr = curaddr;
segs[seg].ds_len = sgsize;
first = 0;
} else {
if (curaddr == lastaddr &&
(segs[seg].ds_len + sgsize) <= dmat->dt_maxsegsz &&
(dmat->dt_boundary == 0 ||
(segs[seg].ds_addr & bmask) == (curaddr & bmask)))
segs[seg].ds_len += sgsize;
else {
if (++seg >= dmat->dt_nsegments)
break;
segs[seg].ds_addr = curaddr;
segs[seg].ds_len = sgsize;
}
}
lastaddr = curaddr + sgsize;
vaddr += sgsize;
buflen -= sgsize;
}
*segp = seg;
*lastaddrp = lastaddr;
/*
* Did we fit?
*/
return (buflen != 0 ? EFBIG : 0); /* XXX better return value here? */
}
/*
* Common function for loading a DMA map with a linear buffer. May
* be called by bus-specific DMA map load functions.
*
* Most SPARCs have IOMMUs in the bus controllers. In those cases
* they only need one segment and will use virtual addresses for DVMA.
* Those bus controllers should intercept these vectors and should
* *NEVER* call nexus_dmamap_load() which is used only by devices that
* bypass DVMA.
*/
static int
nexus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf,
bus_size_t buflen, bus_dmamap_callback_t *callback, void *callback_arg,
int flags)
{
bus_addr_t lastaddr;
int error, nsegs;
error = _nexus_dmamap_load_buffer(dmat, buf, buflen, NULL, flags,
&lastaddr, dmat->dt_segments, &nsegs, 1);
if (error == 0) {
(*callback)(callback_arg, dmat->dt_segments, nsegs + 1, 0);
map->dm_flags |= DMF_LOADED;
} else
(*callback)(callback_arg, NULL, 0, error);
return (0);
}
/*
* Like nexus_dmamap_load(), but for mbufs.
*/
static int
nexus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map, struct mbuf *m0,
bus_dmamap_callback2_t *callback, void *callback_arg, int flags)
{
int nsegs, error;
M_ASSERTPKTHDR(m0);
nsegs = 0;
error = 0;
if (m0->m_pkthdr.len <= dmat->dt_maxsize) {
int first = 1;
bus_addr_t lastaddr = 0;
struct mbuf *m;
for (m = m0; m != NULL && error == 0; m = m->m_next) {
if (m->m_len > 0) {
error = _nexus_dmamap_load_buffer(dmat,
m->m_data, m->m_len,NULL, flags, &lastaddr,
dmat->dt_segments, &nsegs, first);
first = 0;
}
}
} else {
error = EINVAL;
}
if (error) {
/* force "no valid mappings" in callback */
(*callback)(callback_arg, dmat->dt_segments, 0, 0, error);
} else {
map->dm_flags |= DMF_LOADED;
(*callback)(callback_arg, dmat->dt_segments, nsegs + 1,
m0->m_pkthdr.len, error);
}
return (error);
}
static int
nexus_dmamap_load_mbuf_sg(bus_dma_tag_t dmat, bus_dmamap_t map, struct mbuf *m0,
bus_dma_segment_t *segs, int *nsegs, int flags)
{
int error;
M_ASSERTPKTHDR(m0);
*nsegs = 0;
error = 0;
if (m0->m_pkthdr.len <= dmat->dt_maxsize) {
int first = 1;
bus_addr_t lastaddr = 0;
struct mbuf *m;
for (m = m0; m != NULL && error == 0; m = m->m_next) {
if (m->m_len > 0) {
error = _nexus_dmamap_load_buffer(dmat,
m->m_data, m->m_len,NULL, flags, &lastaddr,
segs, nsegs, first);
first = 0;
}
}
} else {
error = EINVAL;
}
++*nsegs;
return (error);
}
/*
* Like nexus_dmamap_load(), but for uios.
*/
static int
nexus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map, struct uio *uio,
bus_dmamap_callback2_t *callback, void *callback_arg, int flags)
{
bus_addr_t lastaddr;
int nsegs, error, first, i;
bus_size_t resid;
struct iovec *iov;
struct thread *td = NULL;
resid = uio->uio_resid;
iov = uio->uio_iov;
if (uio->uio_segflg == UIO_USERSPACE) {
td = uio->uio_td;
KASSERT(td != NULL, ("%s: USERSPACE but no proc", __func__));
}
nsegs = 0;
error = 0;
first = 1;
for (i = 0; i < uio->uio_iovcnt && resid != 0 && !error; i++) {
/*
* Now at the first iovec to load. Load each iovec
* until we have exhausted the residual count.
*/
bus_size_t minlen =
resid < iov[i].iov_len ? resid : iov[i].iov_len;
caddr_t addr = (caddr_t) iov[i].iov_base;
if (minlen > 0) {
error = _nexus_dmamap_load_buffer(dmat, addr, minlen,
td, flags, &lastaddr, dmat->dt_segments, &nsegs,
first);
first = 0;
resid -= minlen;
}
}
if (error) {
/* force "no valid mappings" in callback */
(*callback)(callback_arg, dmat->dt_segments, 0, 0, error);
} else {
map->dm_flags |= DMF_LOADED;
(*callback)(callback_arg, dmat->dt_segments, nsegs + 1,
uio->uio_resid, error);
}
return (error);
}
/*
* Common function for unloading a DMA map. May be called by
* bus-specific DMA map unload functions.
*/
static void
nexus_dmamap_unload(bus_dma_tag_t dmat, bus_dmamap_t map)
{
map->dm_flags &= ~DMF_LOADED;
}
/*
* Common function for DMA map synchronization. May be called
* by bus-specific DMA map synchronization functions.
*/
static void
nexus_dmamap_sync(bus_dma_tag_t dmat, bus_dmamap_t map, bus_dmasync_op_t op)
{
/*
* We sync out our caches, but the bus must do the same.
*
* Actually a #Sync is expensive. We should optimize.
*/
if ((op & BUS_DMASYNC_PREREAD) || (op & BUS_DMASYNC_PREWRITE)) {
/*
* Don't really need to do anything, but flush any pending
* writes anyway.
*/
membar(Sync);
}
if (op & BUS_DMASYNC_POSTWRITE) {
/* Nothing to do. Handled by the bus controller. */
}
}
/*
* Common function for DMA-safe memory allocation. May be called
* by bus-specific DMA memory allocation functions.
*/
static int
nexus_dmamem_alloc(bus_dma_tag_t dmat, void **vaddr, int flags,
bus_dmamap_t *mapp)
{
int mflags;
if (flags & BUS_DMA_NOWAIT)
mflags = M_NOWAIT;
else
mflags = M_WAITOK;
if (flags & BUS_DMA_ZERO)
mflags |= M_ZERO;
/*
* XXX:
* (dmat->dt_alignment < dmat->dt_maxsize) is just a quick hack; the
* exact alignment guarantees of malloc need to be nailed down, and
* the code below should be rewritten to take that into account.
*
* In the meantime, we'll warn the user if malloc gets it wrong.
*/
if (dmat->dt_maxsize <= PAGE_SIZE &&
dmat->dt_alignment < dmat->dt_maxsize)
*vaddr = malloc(dmat->dt_maxsize, M_DEVBUF, mflags);
else {
/*
* XXX use contigmalloc until it is merged into this
* facility and handles multi-seg allocations. Nobody
* is doing multi-seg allocations yet though.
*/
*vaddr = contigmalloc(dmat->dt_maxsize, M_DEVBUF, mflags,
0ul, dmat->dt_lowaddr,
dmat->dt_alignment ? dmat->dt_alignment : 1UL,
dmat->dt_boundary);
}
if (*vaddr == NULL)
return (ENOMEM);
if (vtophys(*vaddr) % dmat->dt_alignment)
printf("%s: failed to align memory properly.\n", __func__);
return (0);
}
/*
* Common function for freeing DMA-safe memory. May be called by
* bus-specific DMA memory free functions.
*/
static void
nexus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map)
{
if (dmat->dt_maxsize <= PAGE_SIZE &&
dmat->dt_alignment < dmat->dt_maxsize)
free(vaddr, M_DEVBUF);
else
contigfree(vaddr, dmat->dt_maxsize, M_DEVBUF);
}
static struct bus_dma_methods nexus_dma_methods = {
nexus_dmamap_create,
nexus_dmamap_destroy,
nexus_dmamap_load,
nexus_dmamap_load_mbuf,
nexus_dmamap_load_mbuf_sg,
nexus_dmamap_load_uio,
nexus_dmamap_unload,
nexus_dmamap_sync,
nexus_dmamem_alloc,
nexus_dmamem_free,
};
struct bus_dma_tag nexus_dmatag = {
NULL,
NULL,
1,
0,
~0,
~0,
NULL, /* XXX */
NULL,
~0,
~0,
~0,
0,
0,
0,
NULL,
NULL,
NULL,
&nexus_dma_methods,
};
/*
* Helpers to map/unmap bus memory
*/
int
bus_space_map(bus_space_tag_t tag, bus_addr_t address, bus_size_t size,
int flags, bus_space_handle_t *handlep)
{
return (sparc64_bus_mem_map(tag, address, size, flags, 0, handlep));
}
int
sparc64_bus_mem_map(bus_space_tag_t tag, bus_addr_t addr, bus_size_t size,
int flags, vm_offset_t vaddr, bus_space_handle_t *hp)
{
vm_offset_t sva;
vm_offset_t va;
vm_paddr_t pa;
vm_size_t vsz;
u_long pm_flags;
/*
* Given that we use physical access for bus_space(9) there's no need
* need to map anything in unless BUS_SPACE_MAP_LINEAR is requested.
*/
if ((flags & BUS_SPACE_MAP_LINEAR) == 0) {
*hp = addr;
return (0);
}
if (tag->bst_cookie == NULL) {
printf("%s: resource cookie not set\n", __func__);
return (EINVAL);
}
size = round_page(size);
if (size == 0) {
printf("%s: zero size\n", __func__);
return (EINVAL);
}
switch (tag->bst_type) {
case PCI_CONFIG_BUS_SPACE:
case PCI_IO_BUS_SPACE:
case PCI_MEMORY_BUS_SPACE:
pm_flags = TD_IE;
break;
default:
pm_flags = 0;
break;
}
if ((flags & BUS_SPACE_MAP_CACHEABLE) == 0)
pm_flags |= TD_E;
if (vaddr != 0L)
sva = trunc_page(vaddr);
else {
if ((sva = kmem_alloc_nofault(kernel_map, size)) == 0)
panic("%s: cannot allocate virtual memory", __func__);
}
pa = trunc_page(addr);
if ((flags & BUS_SPACE_MAP_READONLY) == 0)
pm_flags |= TD_W;
va = sva;
vsz = size;
do {
pmap_kenter_flags(va, pa, pm_flags);
va += PAGE_SIZE;
pa += PAGE_SIZE;
} while ((vsz -= PAGE_SIZE) > 0);
tlb_range_demap(kernel_pmap, sva, sva + size - 1);
/* Note: we preserve the page offset. */
rman_set_virtual(tag->bst_cookie, (void *)(sva | (addr & PAGE_MASK)));
return (0);
}
void
bus_space_unmap(bus_space_tag_t tag, bus_space_handle_t handle,
bus_size_t size)
{
sparc64_bus_mem_unmap(tag, handle, size);
}
int
sparc64_bus_mem_unmap(bus_space_tag_t tag, bus_space_handle_t handle,
bus_size_t size)
{
vm_offset_t sva;
vm_offset_t va;
vm_offset_t endva;
if (tag->bst_cookie == NULL ||
(sva = (vm_offset_t)rman_get_virtual(tag->bst_cookie)) == 0)
return (0);
sva = trunc_page(sva);
endva = sva + round_page(size);
for (va = sva; va < endva; va += PAGE_SIZE)
pmap_kremove_flags(va);
tlb_range_demap(kernel_pmap, sva, sva + size - 1);
kmem_free(kernel_map, sva, size);
return (0);
}
/*
* Fake up a bus tag, for use by console drivers in early boot when the
* regular means to allocate resources are not yet available.
* Addr is the physical address of the desired start of the handle.
*/
bus_space_handle_t
sparc64_fake_bustag(int space, bus_addr_t addr, struct bus_space_tag *ptag)
{
ptag->bst_cookie = NULL;
ptag->bst_parent = NULL;
ptag->bst_type = space;
ptag->bst_bus_barrier = nexus_bus_barrier;
return (addr);
}
/*
* Allocate a bus tag.
*/
bus_space_tag_t
sparc64_alloc_bus_tag(void *cookie, struct bus_space_tag *ptag, int type,
void *barrier)
{
bus_space_tag_t bt;
bt = malloc(sizeof(struct bus_space_tag), M_DEVBUF, M_NOWAIT);
if (bt == NULL)
return (NULL);
bt->bst_cookie = cookie;
bt->bst_parent = ptag;
bt->bst_type = type;
bt->bst_bus_barrier = barrier;
return (bt);
}
/*
* Base bus space handlers.
*/
static void
nexus_bus_barrier(bus_space_tag_t t, bus_space_handle_t h, bus_size_t offset,
bus_size_t size, int flags)
{
/*
* We have lots of alternatives depending on whether we're
* synchronizing loads with loads, loads with stores, stores
* with loads, or stores with stores. The only ones that seem
* generic are #Sync and #MemIssue. I'll use #Sync for safety.
*/
switch(flags) {
case BUS_SPACE_BARRIER_READ | BUS_SPACE_BARRIER_WRITE:
case BUS_SPACE_BARRIER_READ:
case BUS_SPACE_BARRIER_WRITE:
membar(Sync);
break;
default:
panic("%s: unknown flags", __func__);
}
return;
}
struct bus_space_tag nexus_bustag = {
NULL, /* cookie */
NULL, /* parent bus tag */
NEXUS_BUS_SPACE, /* type */
nexus_bus_barrier, /* bus_space_barrier */
};