NetBSD-5.0.2/sys/arch/landisk/landisk/bus_dma.c
/* $NetBSD: bus_dma.c,v 1.7 2008/06/04 12:41:41 ad Exp $ */
/*
* Copyright (c) 2005 NONAKA Kimihiro
* 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 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.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: bus_dma.c,v 1.7 2008/06/04 12:41:41 ad Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <uvm/uvm_extern.h>
#include <sh3/cache.h>
#include <machine/autoconf.h>
#define _LANDISK_BUS_DMA_PRIVATE
#include <machine/bus.h>
#if defined(DEBUG) && defined(BUSDMA_DEBUG)
int busdma_debug = 0;
#define DPRINTF(a) if (busdma_debug) printf a
#else
#define DPRINTF(a)
#endif
struct _bus_dma_tag landisk_bus_dma = {
._cookie = NULL,
._dmamap_create = _bus_dmamap_create,
._dmamap_destroy = _bus_dmamap_destroy,
._dmamap_load = _bus_dmamap_load,
._dmamap_load_mbuf = _bus_dmamap_load_mbuf,
._dmamap_load_uio = _bus_dmamap_load_uio,
._dmamap_load_raw = _bus_dmamap_load_raw,
._dmamap_unload = _bus_dmamap_unload,
._dmamap_sync = _bus_dmamap_sync,
._dmamem_alloc = _bus_dmamem_alloc,
._dmamem_free = _bus_dmamem_free,
._dmamem_map = _bus_dmamem_map,
._dmamem_unmap = _bus_dmamem_unmap,
._dmamem_mmap = _bus_dmamem_mmap,
};
/*
* Create a DMA map.
*/
int
_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)
{
bus_dmamap_t map;
void *mapstore;
size_t mapsize;
DPRINTF(("%s: t = %p, size = %ld, nsegments = %d, maxsegsz = %ld,"
" boundary = %ld, flags = %x\n",
__func__, t, size, nsegments, maxsegsz, boundary, flags));
/*
* Allocate and initialize the DMA map. The end of the map is
* a variable-sized array of segments, so we allocate enough
* room for them in one shot. bus_dmamap_t includes one
* bus_dma_segment_t already, hence the (nsegments - 1).
*
* Note that we don't preserve WAITOK and NOWAIT flags.
* Preservation of ALLOCNOW notifies others that we've
* reserved these resources, and they are not to be freed.
*/
mapsize = sizeof(struct _bus_dmamap)
+ (sizeof(bus_dma_segment_t) * (nsegments - 1));
mapstore = malloc(mapsize, M_DMAMAP, M_ZERO
| (flags & BUS_DMA_NOWAIT) ? M_NOWAIT : M_WAITOK);
if (mapstore == NULL)
return ENOMEM;
DPRINTF(("%s: dmamp = %p\n", __func__, mapstore));
map = (bus_dmamap_t)mapstore;
map->_dm_size = size;
map->_dm_segcnt = nsegments;
map->_dm_maxsegsz = maxsegsz;
map->_dm_boundary = boundary;
map->_dm_flags = flags & ~(BUS_DMA_WAITOK | BUS_DMA_NOWAIT);
map->dm_mapsize = 0; /* no valid mappings */
map->dm_nsegs = 0;
*dmamp = map;
return 0;
}
/*
* Destroy a DMA map.
*/
void
_bus_dmamap_destroy(bus_dma_tag_t t, bus_dmamap_t map)
{
DPRINTF(("%s: t = %p, map = %p\n", __func__, t, map));
free(map, M_DMAMAP);
}
static inline int
_bus_dmamap_load_paddr(bus_dma_tag_t t, bus_dmamap_t map,
paddr_t paddr, vaddr_t vaddr, int size, int *segp, paddr_t *lastaddrp,
int first)
{
bus_dma_segment_t * const segs = map->dm_segs;
bus_addr_t bmask = ~(map->_dm_boundary - 1);
bus_addr_t lastaddr;
int nseg;
int sgsize;
nseg = *segp;
lastaddr = *lastaddrp;
DPRINTF(("%s: t = %p, map = %p, paddr = 0x%08lx,"
" vaddr = 0x%08lx, size = %d\n",
__func__, t, map, paddr, vaddr, size));
DPRINTF(("%s: nseg = %d, bmask = 0x%08lx, lastaddr = 0x%08lx\n",
__func__, nseg, bmask, lastaddr));
do {
sgsize = size;
/*
* Make sure we don't cross any boundaries.
*/
if (map->_dm_boundary > 0) {
bus_addr_t baddr; /* next boundary address */
baddr = (paddr + map->_dm_boundary) & bmask;
if (sgsize > (baddr - paddr))
sgsize = (baddr - paddr);
}
DPRINTF(("%s: sgsize = %d\n", __func__, sgsize));
/*
* Insert chunk coalescing with previous segment if possible.
*/
if (first) {
DPRINTF(("%s: first\n", __func__));
first = 0;
segs[nseg].ds_addr = SH3_PHYS_TO_P2SEG(paddr);
segs[nseg].ds_len = sgsize;
segs[nseg]._ds_vaddr = vaddr;
}
else if ((paddr == lastaddr)
&& (segs[nseg].ds_len + sgsize <= map->_dm_maxsegsz)
&& (map->_dm_boundary == 0 ||
(segs[nseg].ds_addr & bmask) == (paddr & bmask)))
{
DPRINTF(("%s: coalesce\n", __func__));
segs[nseg].ds_len += sgsize;
}
else {
DPRINTF(("%s: new\n", __func__));
++nseg;
if (nseg >= map->_dm_segcnt)
break;
segs[nseg].ds_addr = SH3_PHYS_TO_P2SEG(paddr);
segs[nseg].ds_len = sgsize;
segs[nseg]._ds_vaddr = vaddr;
}
paddr += sgsize;
vaddr += sgsize;
size -= sgsize;
lastaddr = paddr;
DPRINTF(("%s: lastaddr = 0x%08lx, paddr = 0x%08lx,"
" vaddr = 0x%08lx, size = %d\n",
__func__, lastaddr, paddr, vaddr, size));
} while (size > 0);
DPRINTF(("%s: nseg = %d\n", __func__, nseg));
*segp = nseg;
*lastaddrp = lastaddr;
if (size != 0) {
/*
* It didn't fit. If there is a chained window, we
* will automatically fall back to it.
*/
return (EFBIG); /* XXX better return value here? */
}
return (0);
}
static inline int
_bus_bus_dmamap_load_buffer(bus_dma_tag_t t, bus_dmamap_t map, void *buf,
bus_size_t buflen, struct proc *p, int flags, int *segp)
{
bus_size_t sgsize;
bus_addr_t curaddr;
bus_size_t len;
paddr_t lastaddr;
vaddr_t vaddr = (vaddr_t)buf;
pmap_t pmap;
int first;
int error;
DPRINTF(("%s: t = %p, map = %p, buf = %p, buflen = %ld,"
" p = %p, flags = %x\n",
__func__, t, map, buf, buflen, p, flags));
if (p != NULL)
pmap = p->p_vmspace->vm_map.pmap;
else
pmap = pmap_kernel();
first = 1;
lastaddr = 0;
len = buflen;
while (len > 0) {
bool mapped;
mapped = pmap_extract(pmap, vaddr, &curaddr);
if (!mapped)
return EFAULT;
sgsize = PAGE_SIZE - (vaddr & PGOFSET);
if (len < sgsize)
sgsize = len;
error = _bus_dmamap_load_paddr(t, map, curaddr, vaddr, sgsize,
segp, &lastaddr, first);
if (error)
return error;
vaddr += sgsize;
len -= sgsize;
first = 0;
}
return 0;
}
/*
* Load a DMA map with a linear buffer.
*/
int
_bus_dmamap_load(bus_dma_tag_t t, bus_dmamap_t map, void *buf,
bus_size_t buflen, struct proc *p, int flags)
{
bus_addr_t addr = (bus_addr_t)buf;
paddr_t lastaddr;
int seg;
int first;
int error;
DPRINTF(("%s: t = %p, map = %p, buf = %p, buflen = %ld,"
" p = %p, flags = %x\n",
__func__, t, map, buf, buflen, p, flags));
/* make sure that on error condition we return "no valid mappings" */
map->dm_mapsize = 0;
map->dm_nsegs = 0;
if (buflen > map->_dm_size)
return (EINVAL);
error = 0;
seg = 0;
if (SH3_P1SEG_BASE <= addr && addr + buflen <= SH3_P2SEG_END) {
bus_addr_t curaddr;
bus_size_t sgsize;
bus_size_t len = buflen;
DPRINTF(("%s: P[12]SEG (0x%08lx)\n", __func__, addr));
first = 1;
lastaddr = 0;
while (len > 0) {
curaddr = SH3_P1SEG_TO_PHYS(addr);
sgsize = PAGE_SIZE - ((u_long)addr & PGOFSET);
if (len < sgsize)
sgsize = len;
error = _bus_dmamap_load_paddr(t, map,
curaddr, addr, sgsize,
&seg, &lastaddr, first);
if (error)
break;
addr += sgsize;
len -= sgsize;
first = 0;
}
}
else {
error = _bus_bus_dmamap_load_buffer(t, map, buf, buflen,
p, flags, &seg);
}
if (error)
return (error);
map->dm_nsegs = seg + 1;
map->dm_mapsize = buflen;
return 0;
}
/*
* Like _bus_dmamap_load(), but for mbufs.
*/
int
_bus_dmamap_load_mbuf(bus_dma_tag_t t, bus_dmamap_t map, struct mbuf *m0,
int flags)
{
struct mbuf *m;
paddr_t lastaddr;
int seg;
int first;
int error;
DPRINTF(("%s: t = %p, map = %p, m0 = %p, flags = %x\n",
__func__, t, map, m0, flags));
/* make sure that on error condition we return "no valid mappings" */
map->dm_nsegs = 0;
map->dm_mapsize = 0;
#ifdef DIAGNOSTIC
if ((m0->m_flags & M_PKTHDR) == 0)
panic("_bus_dmamap_load_mbuf: no packet header");
#endif
if (m0->m_pkthdr.len > map->_dm_size)
return (EINVAL);
seg = 0;
first = 1;
lastaddr = 0;
for (m = m0; m != NULL; m = m->m_next) {
paddr_t paddr;
vaddr_t vaddr;
int size;
if (m->m_len == 0)
continue;
vaddr = (vaddr_t)m->m_data;
size = m->m_len;
if (SH3_P1SEG_BASE <= vaddr && vaddr < SH3_P3SEG_BASE) {
paddr = (paddr_t)(PMAP_UNMAP_POOLPAGE(vaddr));
error = _bus_dmamap_load_paddr(t, map,
paddr, vaddr, size,
&seg, &lastaddr, first);
if (error)
return error;
first = 0;
}
else {
/* XXX: stolen from load_buffer, need to refactor */
while (size > 0) {
bus_size_t sgsize;
bool mapped;
mapped = pmap_extract(pmap_kernel(), vaddr,
&paddr);
if (!mapped)
return EFAULT;
sgsize = PAGE_SIZE - (vaddr & PGOFSET);
if (size < sgsize)
sgsize = size;
error = _bus_dmamap_load_paddr(t, map,
paddr, vaddr, sgsize,
&seg, &lastaddr, first);
if (error)
return error;
vaddr += sgsize;
size -= sgsize;
first = 0;
}
}
}
map->dm_nsegs = seg + 1;
map->dm_mapsize = m0->m_pkthdr.len;
return 0;
}
/*
* Like _bus_dmamap_load(), but for uios.
*/
int
_bus_dmamap_load_uio(bus_dma_tag_t t, bus_dmamap_t map, struct uio *uio,
int flags)
{
panic("_bus_dmamap_load_uio: not implemented");
}
/*
* Like _bus_dmamap_load(), but for raw memory allocated with
* bus_dmamem_alloc().
*/
int
_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("_bus_dmamap_load_raw: not implemented");
}
/*
* Unload a DMA map.
*/
void
_bus_dmamap_unload(bus_dma_tag_t t, bus_dmamap_t map)
{
DPRINTF(("%s: t = %p, map = %p\n", __func__, t, map));
map->dm_nsegs = 0;
map->dm_mapsize = 0;
}
/*
* Synchronize a DMA map.
*/
void
_bus_dmamap_sync(bus_dma_tag_t t, bus_dmamap_t map, bus_addr_t offset,
bus_size_t len, int ops)
{
bus_size_t minlen;
bus_addr_t addr, naddr;
int i;
DPRINTF(("%s: t = %p, map = %p, offset = %ld, len = %ld, ops = %x\n",
__func__, t, map, offset, len, ops));
#ifdef DIAGNOSTIC
if ((ops & (BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE)) != 0 &&
(ops & (BUS_DMASYNC_POSTREAD|BUS_DMASYNC_POSTWRITE)) != 0)
panic("_bus_dmamap_sync: mix PRE and POST");
if (offset >= map->dm_mapsize)
panic("_bus_dmamap_sync: bad offset");
if ((offset + len) > map->dm_mapsize)
panic("_bus_dmamap_sync: bad length");
#endif
if (!sh_cache_enable_dcache) {
/* Nothing to do */
DPRINTF(("%s: disabled D-Cache\n", __func__));
return;
}
for (i = 0; i < map->dm_nsegs && len != 0; i++) {
/* Find the beginning segment. */
if (offset >= map->dm_segs[i].ds_len) {
offset -= map->dm_segs[i].ds_len;
continue;
}
/*
* Now at the first segment to sync; nail
* each segment until we have exhausted the
* length.
*/
minlen = len < map->dm_segs[i].ds_len - offset ?
len : map->dm_segs[i].ds_len - offset;
addr = map->dm_segs[i]._ds_vaddr;
naddr = addr + offset;
if ((naddr >= SH3_P2SEG_BASE)
&& (naddr + minlen <= SH3_P2SEG_END)) {
DPRINTF(("%s: P2SEG (0x%08lx)\n", __func__, naddr));
offset = 0;
len -= minlen;
continue;
}
DPRINTF(("%s: flushing segment %d "
"(0x%lx+%lx, 0x%lx+0x%lx) (remain = %ld)\n",
__func__, i,
addr, offset, addr, offset + minlen - 1, len));
switch (ops) {
case BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE:
sh_dcache_wbinv_range(naddr, minlen);
break;
case BUS_DMASYNC_PREREAD:
if (((naddr | minlen) & (~(sh_cache_line_size - 1))) == 0) {
sh_dcache_inv_range(naddr, minlen);
} else {
sh_dcache_wbinv_range(naddr, minlen);
}
break;
case BUS_DMASYNC_PREWRITE:
if (SH_HAS_WRITEBACK_CACHE) {
sh_dcache_wb_range(naddr, minlen);
}
break;
}
offset = 0;
len -= minlen;
}
}
/*
* Allocate memory safe for DMA.
*/
int
_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)
{
extern paddr_t avail_start, avail_end; /* from pmap.c */
struct pglist mlist;
paddr_t curaddr, lastaddr;
struct vm_page *m;
int curseg, error;
DPRINTF(("%s: t = %p, size = %ld, alignment = %ld, boundary = %ld,"
" segs = %p, nsegs = %d, rsegs = %p, flags = %x\n",
__func__, t, size, alignment, boundary,
segs, nsegs, rsegs, flags));
DPRINTF(("%s: avail_start = 0x%08lx, avail_end = 0x%08lx\n",
__func__, avail_start, avail_end));
/* Always round the size. */
size = round_page(size);
/*
* Allocate the pages from the VM system.
*/
error = uvm_pglistalloc(size, avail_start, avail_end - PAGE_SIZE,
alignment, boundary, &mlist, nsegs, (flags & BUS_DMA_NOWAIT) == 0);
if (error)
return (error);
/*
* Compute the location, size, and number of segments actually
* returned by the VM code.
*/
m = mlist.tqh_first;
curseg = 0;
lastaddr = segs[curseg].ds_addr = VM_PAGE_TO_PHYS(m);
segs[curseg].ds_len = PAGE_SIZE;
DPRINTF(("%s: m = %p, lastaddr = 0x%08lx\n", __func__, m, lastaddr));
while ((m = TAILQ_NEXT(m, pageq.queue)) != NULL) {
curaddr = VM_PAGE_TO_PHYS(m);
DPRINTF(("%s: m = %p, curaddr = 0x%08lx, lastaddr = 0x%08lx\n",
__func__, m, curaddr, lastaddr));
if (curaddr == (lastaddr + PAGE_SIZE)) {
segs[curseg].ds_len += PAGE_SIZE;
} else {
DPRINTF(("%s: new segment\n", __func__));
curseg++;
segs[curseg].ds_addr = curaddr;
segs[curseg].ds_len = PAGE_SIZE;
}
lastaddr = curaddr;
}
*rsegs = curseg + 1;
DPRINTF(("%s: curseg = %d, *rsegs = %d\n", __func__, curseg, *rsegs));
return (0);
}
/*
* Common function for freeing DMA-safe memory. May be called by
* bus-specific DMA memory free functions.
*/
void
_bus_dmamem_free(bus_dma_tag_t t, bus_dma_segment_t *segs, int nsegs)
{
struct vm_page *m;
bus_addr_t addr;
struct pglist mlist;
int curseg;
DPRINTF(("%s: t = %p, segs = %p, nsegs = %d\n",
__func__, t, segs, nsegs));
/*
* Build a list of pages to free back to the VM system.
*/
TAILQ_INIT(&mlist);
for (curseg = 0; curseg < nsegs; curseg++) {
DPRINTF(("%s: segs[%d]: ds_addr = 0x%08lx, ds_len = %ld\n",
__func__, curseg,
segs[curseg].ds_addr, segs[curseg].ds_len));
for (addr = segs[curseg].ds_addr;
addr < (segs[curseg].ds_addr + segs[curseg].ds_len);
addr += PAGE_SIZE)
{
m = PHYS_TO_VM_PAGE(addr);
DPRINTF(("%s: m = %p\n", __func__, m));
TAILQ_INSERT_TAIL(&mlist, m, pageq.queue);
}
}
uvm_pglistfree(&mlist);
}
int
_bus_dmamem_map(bus_dma_tag_t t, bus_dma_segment_t *segs, int nsegs,
size_t size, void **kvap, int flags)
{
vaddr_t va;
bus_addr_t addr;
int curseg;
DPRINTF(("%s: t = %p, segs = %p, nsegs = %d, size = %d,"
" kvap = %p, flags = %x\n",
__func__, t, segs, nsegs, size, kvap, flags));
/*
* If we're mapping only a single segment, use direct-mapped
* va, to avoid thrashing the TLB.
*/
if (nsegs == 1) {
if (flags & BUS_DMA_COHERENT)
*kvap = (void *)SH3_PHYS_TO_P2SEG(segs[0].ds_addr);
else
*kvap = (void *)SH3_PHYS_TO_P1SEG(segs[0].ds_addr);
DPRINTF(("%s: addr = 0x%08lx, kva = %p\n",
__func__, segs[0].ds_addr, *kvap));
return 0;
}
/* Always round the size. */
size = round_page(size);
va = uvm_km_alloc(kernel_map, size, 0, UVM_KMF_VAONLY
| (flags & BUS_DMA_NOWAIT) ? UVM_KMF_NOWAIT : 0);
if (va == 0)
return (ENOMEM);
for (curseg = 0; curseg < nsegs; curseg++) {
DPRINTF(("%s: segs[%d]: ds_addr = 0x%08lx, ds_len = %ld\n",
__func__, curseg,
segs[curseg].ds_addr, segs[curseg].ds_len));
for (addr = segs[curseg].ds_addr;
addr < segs[curseg].ds_addr + segs[curseg].ds_len;
addr += PAGE_SIZE, va += PAGE_SIZE, size -= PAGE_SIZE)
{
if (__predict_false(size == 0))
panic("_bus_dmamem_map: size botch");
pmap_kenter_pa(va, addr,
VM_PROT_READ | VM_PROT_WRITE);
}
}
pmap_update(pmap_kernel());
*kvap = (void *)va;
return (0);
}
void
_bus_dmamem_unmap(bus_dma_tag_t t, void *kva, size_t size)
{
vaddr_t vaddr = (vaddr_t)kva;
DPRINTF(("%s: t = %p, kva = %p, size = %d\n",
__func__, t, kva, size));
#ifdef DIAGNOSTIC
if (vaddr & PAGE_MASK)
panic("_bus_dmamem_unmap");
#endif
/* nothing to do if we mapped it via P1SEG or P2SEG */
if (SH3_P1SEG_BASE <= vaddr && vaddr <= SH3_P2SEG_END)
return;
size = round_page(size);
pmap_kremove(vaddr, size);
pmap_update(pmap_kernel());
uvm_km_free(kernel_map, vaddr, size, UVM_KMF_VAONLY);
}
paddr_t
_bus_dmamem_mmap(bus_dma_tag_t t, bus_dma_segment_t *segs, int nsegs,
off_t off, int prot, int flags)
{
/* Not implemented. */
return (paddr_t)(-1);
}