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/* $FreeBSD: release/9.1.0/sys/dev/usb/usb_busdma.c 235000 2012-05-04 15:05:30Z hselasky $ */
/*-
* Copyright (c) 2008 Hans Petter Selasky. 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 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.
*/
#include <sys/stdint.h>
#include <sys/stddef.h>
#include <sys/param.h>
#include <sys/queue.h>
#include <sys/types.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/bus.h>
#include <sys/module.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/condvar.h>
#include <sys/sysctl.h>
#include <sys/sx.h>
#include <sys/unistd.h>
#include <sys/callout.h>
#include <sys/malloc.h>
#include <sys/priv.h>
#include <dev/usb/usb.h>
#include <dev/usb/usbdi.h>
#include <dev/usb/usbdi_util.h>
#define USB_DEBUG_VAR usb_debug
#include <dev/usb/usb_core.h>
#include <dev/usb/usb_busdma.h>
#include <dev/usb/usb_process.h>
#include <dev/usb/usb_transfer.h>
#include <dev/usb/usb_device.h>
#include <dev/usb/usb_util.h>
#include <dev/usb/usb_debug.h>
#include <dev/usb/usb_controller.h>
#include <dev/usb/usb_bus.h>
#if USB_HAVE_BUSDMA
static void usb_dma_tag_create(struct usb_dma_tag *, usb_size_t, usb_size_t);
static void usb_dma_tag_destroy(struct usb_dma_tag *);
static void usb_dma_lock_cb(void *, bus_dma_lock_op_t);
static void usb_pc_alloc_mem_cb(void *, bus_dma_segment_t *, int, int);
static void usb_pc_load_mem_cb(void *, bus_dma_segment_t *, int, int);
static void usb_pc_common_mem_cb(void *, bus_dma_segment_t *, int, int,
uint8_t);
#endif
/*------------------------------------------------------------------------*
* usbd_get_page - lookup DMA-able memory for the given offset
*
* NOTE: Only call this function when the "page_cache" structure has
* been properly initialized !
*------------------------------------------------------------------------*/
void
usbd_get_page(struct usb_page_cache *pc, usb_frlength_t offset,
struct usb_page_search *res)
{
#if USB_HAVE_BUSDMA
struct usb_page *page;
if (pc->page_start) {
/* Case 1 - something has been loaded into DMA */
if (pc->buffer) {
/* Case 1a - Kernel Virtual Address */
res->buffer = USB_ADD_BYTES(pc->buffer, offset);
}
offset += pc->page_offset_buf;
/* compute destination page */
page = pc->page_start;
if (pc->ismultiseg) {
page += (offset / USB_PAGE_SIZE);
offset %= USB_PAGE_SIZE;
res->length = USB_PAGE_SIZE - offset;
res->physaddr = page->physaddr + offset;
} else {
res->length = (usb_size_t)-1;
res->physaddr = page->physaddr + offset;
}
if (!pc->buffer) {
/* Case 1b - Non Kernel Virtual Address */
res->buffer = USB_ADD_BYTES(page->buffer, offset);
}
return;
}
#endif
/* Case 2 - Plain PIO */
res->buffer = USB_ADD_BYTES(pc->buffer, offset);
res->length = (usb_size_t)-1;
#if USB_HAVE_BUSDMA
res->physaddr = 0;
#endif
}
/*------------------------------------------------------------------------*
* usbd_copy_in - copy directly to DMA-able memory
*------------------------------------------------------------------------*/
void
usbd_copy_in(struct usb_page_cache *cache, usb_frlength_t offset,
const void *ptr, usb_frlength_t len)
{
struct usb_page_search buf_res;
while (len != 0) {
usbd_get_page(cache, offset, &buf_res);
if (buf_res.length > len) {
buf_res.length = len;
}
memcpy(buf_res.buffer, ptr, buf_res.length);
offset += buf_res.length;
len -= buf_res.length;
ptr = USB_ADD_BYTES(ptr, buf_res.length);
}
}
/*------------------------------------------------------------------------*
* usbd_copy_in_user - copy directly to DMA-able memory from userland
*
* Return values:
* 0: Success
* Else: Failure
*------------------------------------------------------------------------*/
#if USB_HAVE_USER_IO
int
usbd_copy_in_user(struct usb_page_cache *cache, usb_frlength_t offset,
const void *ptr, usb_frlength_t len)
{
struct usb_page_search buf_res;
int error;
while (len != 0) {
usbd_get_page(cache, offset, &buf_res);
if (buf_res.length > len) {
buf_res.length = len;
}
error = copyin(ptr, buf_res.buffer, buf_res.length);
if (error)
return (error);
offset += buf_res.length;
len -= buf_res.length;
ptr = USB_ADD_BYTES(ptr, buf_res.length);
}
return (0); /* success */
}
#endif
/*------------------------------------------------------------------------*
* usbd_m_copy_in - copy a mbuf chain directly into DMA-able memory
*------------------------------------------------------------------------*/
#if USB_HAVE_MBUF
struct usb_m_copy_in_arg {
struct usb_page_cache *cache;
usb_frlength_t dst_offset;
};
static int
usbd_m_copy_in_cb(void *arg, void *src, uint32_t count)
{
register struct usb_m_copy_in_arg *ua = arg;
usbd_copy_in(ua->cache, ua->dst_offset, src, count);
ua->dst_offset += count;
return (0);
}
void
usbd_m_copy_in(struct usb_page_cache *cache, usb_frlength_t dst_offset,
struct mbuf *m, usb_size_t src_offset, usb_frlength_t src_len)
{
struct usb_m_copy_in_arg arg = {cache, dst_offset};
int error;
error = m_apply(m, src_offset, src_len, &usbd_m_copy_in_cb, &arg);
}
#endif
/*------------------------------------------------------------------------*
* usb_uiomove - factored out code
*------------------------------------------------------------------------*/
#if USB_HAVE_USER_IO
int
usb_uiomove(struct usb_page_cache *pc, struct uio *uio,
usb_frlength_t pc_offset, usb_frlength_t len)
{
struct usb_page_search res;
int error = 0;
while (len != 0) {
usbd_get_page(pc, pc_offset, &res);
if (res.length > len) {
res.length = len;
}
/*
* "uiomove()" can sleep so one needs to make a wrapper,
* exiting the mutex and checking things
*/
error = uiomove(res.buffer, res.length, uio);
if (error) {
break;
}
pc_offset += res.length;
len -= res.length;
}
return (error);
}
#endif
/*------------------------------------------------------------------------*
* usbd_copy_out - copy directly from DMA-able memory
*------------------------------------------------------------------------*/
void
usbd_copy_out(struct usb_page_cache *cache, usb_frlength_t offset,
void *ptr, usb_frlength_t len)
{
struct usb_page_search res;
while (len != 0) {
usbd_get_page(cache, offset, &res);
if (res.length > len) {
res.length = len;
}
memcpy(ptr, res.buffer, res.length);
offset += res.length;
len -= res.length;
ptr = USB_ADD_BYTES(ptr, res.length);
}
}
/*------------------------------------------------------------------------*
* usbd_copy_out_user - copy directly from DMA-able memory to userland
*
* Return values:
* 0: Success
* Else: Failure
*------------------------------------------------------------------------*/
#if USB_HAVE_USER_IO
int
usbd_copy_out_user(struct usb_page_cache *cache, usb_frlength_t offset,
void *ptr, usb_frlength_t len)
{
struct usb_page_search res;
int error;
while (len != 0) {
usbd_get_page(cache, offset, &res);
if (res.length > len) {
res.length = len;
}
error = copyout(res.buffer, ptr, res.length);
if (error)
return (error);
offset += res.length;
len -= res.length;
ptr = USB_ADD_BYTES(ptr, res.length);
}
return (0); /* success */
}
#endif
/*------------------------------------------------------------------------*
* usbd_frame_zero - zero DMA-able memory
*------------------------------------------------------------------------*/
void
usbd_frame_zero(struct usb_page_cache *cache, usb_frlength_t offset,
usb_frlength_t len)
{
struct usb_page_search res;
while (len != 0) {
usbd_get_page(cache, offset, &res);
if (res.length > len) {
res.length = len;
}
memset(res.buffer, 0, res.length);
offset += res.length;
len -= res.length;
}
}
#if USB_HAVE_BUSDMA
/*------------------------------------------------------------------------*
* usb_dma_lock_cb - dummy callback
*------------------------------------------------------------------------*/
static void
usb_dma_lock_cb(void *arg, bus_dma_lock_op_t op)
{
/* we use "mtx_owned()" instead of this function */
}
/*------------------------------------------------------------------------*
* usb_dma_tag_create - allocate a DMA tag
*
* NOTE: If the "align" parameter has a value of 1 the DMA-tag will
* allow multi-segment mappings. Else all mappings are single-segment.
*------------------------------------------------------------------------*/
static void
usb_dma_tag_create(struct usb_dma_tag *udt,
usb_size_t size, usb_size_t align)
{
bus_dma_tag_t tag;
if (bus_dma_tag_create
( /* parent */ udt->tag_parent->tag,
/* alignment */ align,
/* boundary */ (align == 1) ?
USB_PAGE_SIZE : 0,
/* lowaddr */ (2ULL << (udt->tag_parent->dma_bits - 1)) - 1,
/* highaddr */ BUS_SPACE_MAXADDR,
/* filter */ NULL,
/* filterarg */ NULL,
/* maxsize */ size,
/* nsegments */ (align == 1 && size > 1) ?
(2 + (size / USB_PAGE_SIZE)) : 1,
/* maxsegsz */ (align == 1 && size > USB_PAGE_SIZE) ?
USB_PAGE_SIZE : size,
/* flags */ BUS_DMA_KEEP_PG_OFFSET,
/* lockfn */ &usb_dma_lock_cb,
/* lockarg */ NULL,
&tag)) {
tag = NULL;
}
udt->tag = tag;
}
/*------------------------------------------------------------------------*
* usb_dma_tag_free - free a DMA tag
*------------------------------------------------------------------------*/
static void
usb_dma_tag_destroy(struct usb_dma_tag *udt)
{
bus_dma_tag_destroy(udt->tag);
}
/*------------------------------------------------------------------------*
* usb_pc_alloc_mem_cb - BUS-DMA callback function
*------------------------------------------------------------------------*/
static void
usb_pc_alloc_mem_cb(void *arg, bus_dma_segment_t *segs,
int nseg, int error)
{
usb_pc_common_mem_cb(arg, segs, nseg, error, 0);
}
/*------------------------------------------------------------------------*
* usb_pc_load_mem_cb - BUS-DMA callback function
*------------------------------------------------------------------------*/
static void
usb_pc_load_mem_cb(void *arg, bus_dma_segment_t *segs,
int nseg, int error)
{
usb_pc_common_mem_cb(arg, segs, nseg, error, 1);
}
/*------------------------------------------------------------------------*
* usb_pc_common_mem_cb - BUS-DMA callback function
*------------------------------------------------------------------------*/
static void
usb_pc_common_mem_cb(void *arg, bus_dma_segment_t *segs,
int nseg, int error, uint8_t isload)
{
struct usb_dma_parent_tag *uptag;
struct usb_page_cache *pc;
struct usb_page *pg;
usb_size_t rem;
uint8_t owned;
pc = arg;
uptag = pc->tag_parent;
/*
* XXX There is sometimes recursive locking here.
* XXX We should try to find a better solution.
* XXX Until further the "owned" variable does
* XXX the trick.
*/
if (error) {
goto done;
}
pg = pc->page_start;
pg->physaddr = segs->ds_addr & ~(USB_PAGE_SIZE - 1);
rem = segs->ds_addr & (USB_PAGE_SIZE - 1);
pc->page_offset_buf = rem;
pc->page_offset_end += rem;
nseg--;
#ifdef USB_DEBUG
if (rem != (USB_P2U(pc->buffer) & (USB_PAGE_SIZE - 1))) {
/*
* This check verifies that the physical address is correct:
*/
DPRINTFN(0, "Page offset was not preserved\n");
error = 1;
goto done;
}
#endif
while (nseg > 0) {
nseg--;
segs++;
pg++;
pg->physaddr = segs->ds_addr & ~(USB_PAGE_SIZE - 1);
}
done:
owned = mtx_owned(uptag->mtx);
if (!owned)
mtx_lock(uptag->mtx);
uptag->dma_error = (error ? 1 : 0);
if (isload) {
(uptag->func) (uptag);
} else {
cv_broadcast(uptag->cv);
}
if (!owned)
mtx_unlock(uptag->mtx);
}
/*------------------------------------------------------------------------*
* usb_pc_alloc_mem - allocate DMA'able memory
*
* Returns:
* 0: Success
* Else: Failure
*------------------------------------------------------------------------*/
uint8_t
usb_pc_alloc_mem(struct usb_page_cache *pc, struct usb_page *pg,
usb_size_t size, usb_size_t align)
{
struct usb_dma_parent_tag *uptag;
struct usb_dma_tag *utag;
bus_dmamap_t map;
void *ptr;
int err;
uptag = pc->tag_parent;
if (align != 1) {
/*
* The alignment must be greater or equal to the
* "size" else the object can be split between two
* memory pages and we get a problem!
*/
while (align < size) {
align *= 2;
if (align == 0) {
goto error;
}
}
#if 1
/*
* XXX BUS-DMA workaround - FIXME later:
*
* We assume that that the aligment at this point of
* the code is greater than or equal to the size and
* less than two times the size, so that if we double
* the size, the size will be greater than the
* alignment.
*
* The bus-dma system has a check for "alignment"
* being less than "size". If that check fails we end
* up using contigmalloc which is page based even for
* small allocations. Try to avoid that to save
* memory, hence we sometimes to a large number of
* small allocations!
*/
if (size <= (USB_PAGE_SIZE / 2)) {
size *= 2;
}
#endif
}
/* get the correct DMA tag */
utag = usb_dma_tag_find(uptag, size, align);
if (utag == NULL) {
goto error;
}
/* allocate memory */
if (bus_dmamem_alloc(
utag->tag, &ptr, (BUS_DMA_WAITOK | BUS_DMA_COHERENT), &map)) {
goto error;
}
/* setup page cache */
pc->buffer = ptr;
pc->page_start = pg;
pc->page_offset_buf = 0;
pc->page_offset_end = size;
pc->map = map;
pc->tag = utag->tag;
pc->ismultiseg = (align == 1);
mtx_lock(uptag->mtx);
/* load memory into DMA */
err = bus_dmamap_load(
utag->tag, map, ptr, size, &usb_pc_alloc_mem_cb,
pc, (BUS_DMA_WAITOK | BUS_DMA_COHERENT));
if (err == EINPROGRESS) {
cv_wait(uptag->cv, uptag->mtx);
err = 0;
}
mtx_unlock(uptag->mtx);
if (err || uptag->dma_error) {
bus_dmamem_free(utag->tag, ptr, map);
goto error;
}
memset(ptr, 0, size);
usb_pc_cpu_flush(pc);
return (0);
error:
/* reset most of the page cache */
pc->buffer = NULL;
pc->page_start = NULL;
pc->page_offset_buf = 0;
pc->page_offset_end = 0;
pc->map = NULL;
pc->tag = NULL;
return (1);
}
/*------------------------------------------------------------------------*
* usb_pc_free_mem - free DMA memory
*
* This function is NULL safe.
*------------------------------------------------------------------------*/
void
usb_pc_free_mem(struct usb_page_cache *pc)
{
if (pc && pc->buffer) {
bus_dmamap_unload(pc->tag, pc->map);
bus_dmamem_free(pc->tag, pc->buffer, pc->map);
pc->buffer = NULL;
}
}
/*------------------------------------------------------------------------*
* usb_pc_load_mem - load virtual memory into DMA
*
* Return values:
* 0: Success
* Else: Error
*------------------------------------------------------------------------*/
uint8_t
usb_pc_load_mem(struct usb_page_cache *pc, usb_size_t size, uint8_t sync)
{
/* setup page cache */
pc->page_offset_buf = 0;
pc->page_offset_end = size;
pc->ismultiseg = 1;
mtx_assert(pc->tag_parent->mtx, MA_OWNED);
if (size > 0) {
if (sync) {
struct usb_dma_parent_tag *uptag;
int err;
uptag = pc->tag_parent;
/*
* We have to unload the previous loaded DMA
* pages before trying to load a new one!
*/
bus_dmamap_unload(pc->tag, pc->map);
/*
* Try to load memory into DMA.
*/
err = bus_dmamap_load(
pc->tag, pc->map, pc->buffer, size,
&usb_pc_alloc_mem_cb, pc, BUS_DMA_WAITOK);
if (err == EINPROGRESS) {
cv_wait(uptag->cv, uptag->mtx);
err = 0;
}
if (err || uptag->dma_error) {
return (1);
}
} else {
/*
* We have to unload the previous loaded DMA
* pages before trying to load a new one!
*/
bus_dmamap_unload(pc->tag, pc->map);
/*
* Try to load memory into DMA. The callback
* will be called in all cases:
*/
if (bus_dmamap_load(
pc->tag, pc->map, pc->buffer, size,
&usb_pc_load_mem_cb, pc, BUS_DMA_WAITOK)) {
}
}
} else {
if (!sync) {
/*
* Call callback so that refcount is decremented
* properly:
*/
pc->tag_parent->dma_error = 0;
(pc->tag_parent->func) (pc->tag_parent);
}
}
return (0);
}
/*------------------------------------------------------------------------*
* usb_pc_cpu_invalidate - invalidate CPU cache
*------------------------------------------------------------------------*/
void
usb_pc_cpu_invalidate(struct usb_page_cache *pc)
{
if (pc->page_offset_end == pc->page_offset_buf) {
/* nothing has been loaded into this page cache! */
return;
}
/*
* TODO: We currently do XXX_POSTREAD and XXX_PREREAD at the
* same time, but in the future we should try to isolate the
* different cases to optimise the code. --HPS
*/
bus_dmamap_sync(pc->tag, pc->map, BUS_DMASYNC_POSTREAD);
bus_dmamap_sync(pc->tag, pc->map, BUS_DMASYNC_PREREAD);
}
/*------------------------------------------------------------------------*
* usb_pc_cpu_flush - flush CPU cache
*------------------------------------------------------------------------*/
void
usb_pc_cpu_flush(struct usb_page_cache *pc)
{
if (pc->page_offset_end == pc->page_offset_buf) {
/* nothing has been loaded into this page cache! */
return;
}
bus_dmamap_sync(pc->tag, pc->map, BUS_DMASYNC_PREWRITE);
}
/*------------------------------------------------------------------------*
* usb_pc_dmamap_create - create a DMA map
*
* Returns:
* 0: Success
* Else: Failure
*------------------------------------------------------------------------*/
uint8_t
usb_pc_dmamap_create(struct usb_page_cache *pc, usb_size_t size)
{
struct usb_xfer_root *info;
struct usb_dma_tag *utag;
/* get info */
info = USB_DMATAG_TO_XROOT(pc->tag_parent);
/* sanity check */
if (info == NULL) {
goto error;
}
utag = usb_dma_tag_find(pc->tag_parent, size, 1);
if (utag == NULL) {
goto error;
}
/* create DMA map */
if (bus_dmamap_create(utag->tag, 0, &pc->map)) {
goto error;
}
pc->tag = utag->tag;
return 0; /* success */
error:
pc->map = NULL;
pc->tag = NULL;
return 1; /* failure */
}
/*------------------------------------------------------------------------*
* usb_pc_dmamap_destroy
*
* This function is NULL safe.
*------------------------------------------------------------------------*/
void
usb_pc_dmamap_destroy(struct usb_page_cache *pc)
{
if (pc && pc->tag) {
bus_dmamap_destroy(pc->tag, pc->map);
pc->tag = NULL;
pc->map = NULL;
}
}
/*------------------------------------------------------------------------*
* usb_dma_tag_find - factored out code
*------------------------------------------------------------------------*/
struct usb_dma_tag *
usb_dma_tag_find(struct usb_dma_parent_tag *udpt,
usb_size_t size, usb_size_t align)
{
struct usb_dma_tag *udt;
uint8_t nudt;
USB_ASSERT(align > 0, ("Invalid parameter align = 0\n"));
USB_ASSERT(size > 0, ("Invalid parameter size = 0\n"));
udt = udpt->utag_first;
nudt = udpt->utag_max;
while (nudt--) {
if (udt->align == 0) {
usb_dma_tag_create(udt, size, align);
if (udt->tag == NULL) {
return (NULL);
}
udt->align = align;
udt->size = size;
return (udt);
}
if ((udt->align == align) && (udt->size == size)) {
return (udt);
}
udt++;
}
return (NULL);
}
/*------------------------------------------------------------------------*
* usb_dma_tag_setup - initialise USB DMA tags
*------------------------------------------------------------------------*/
void
usb_dma_tag_setup(struct usb_dma_parent_tag *udpt,
struct usb_dma_tag *udt, bus_dma_tag_t dmat,
struct mtx *mtx, usb_dma_callback_t *func,
uint8_t ndmabits, uint8_t nudt)
{
memset(udpt, 0, sizeof(*udpt));
/* sanity checking */
if ((nudt == 0) ||
(ndmabits == 0) ||
(mtx == NULL)) {
/* something is corrupt */
return;
}
/* initialise condition variable */
cv_init(udpt->cv, "USB DMA CV");
/* store some information */
udpt->mtx = mtx;
udpt->func = func;
udpt->tag = dmat;
udpt->utag_first = udt;
udpt->utag_max = nudt;
udpt->dma_bits = ndmabits;
while (nudt--) {
memset(udt, 0, sizeof(*udt));
udt->tag_parent = udpt;
udt++;
}
}
/*------------------------------------------------------------------------*
* usb_bus_tag_unsetup - factored out code
*------------------------------------------------------------------------*/
void
usb_dma_tag_unsetup(struct usb_dma_parent_tag *udpt)
{
struct usb_dma_tag *udt;
uint8_t nudt;
udt = udpt->utag_first;
nudt = udpt->utag_max;
while (nudt--) {
if (udt->align) {
/* destroy the USB DMA tag */
usb_dma_tag_destroy(udt);
udt->align = 0;
}
udt++;
}
if (udpt->utag_max) {
/* destroy the condition variable */
cv_destroy(udpt->cv);
}
}
/*------------------------------------------------------------------------*
* usb_bdma_work_loop
*
* This function handles loading of virtual buffers into DMA and is
* only called when "dma_refcount" is zero.
*------------------------------------------------------------------------*/
void
usb_bdma_work_loop(struct usb_xfer_queue *pq)
{
struct usb_xfer_root *info;
struct usb_xfer *xfer;
usb_frcount_t nframes;
xfer = pq->curr;
info = xfer->xroot;
mtx_assert(info->xfer_mtx, MA_OWNED);
if (xfer->error) {
/* some error happened */
USB_BUS_LOCK(info->bus);
usbd_transfer_done(xfer, 0);
USB_BUS_UNLOCK(info->bus);
return;
}
if (!xfer->flags_int.bdma_setup) {
struct usb_page *pg;
usb_frlength_t frlength_0;
uint8_t isread;
xfer->flags_int.bdma_setup = 1;
/* reset BUS-DMA load state */
info->dma_error = 0;
if (xfer->flags_int.isochronous_xfr) {
/* only one frame buffer */
nframes = 1;
frlength_0 = xfer->sumlen;
} else {
/* can be multiple frame buffers */
nframes = xfer->nframes;
frlength_0 = xfer->frlengths[0];
}
/*
* Set DMA direction first. This is needed to
* select the correct cache invalidate and cache
* flush operations.
*/
isread = USB_GET_DATA_ISREAD(xfer);
pg = xfer->dma_page_ptr;
if (xfer->flags_int.control_xfr &&
xfer->flags_int.control_hdr) {
/* special case */
if (xfer->flags_int.usb_mode == USB_MODE_DEVICE) {
/* The device controller writes to memory */
xfer->frbuffers[0].isread = 1;
} else {
/* The host controller reads from memory */
xfer->frbuffers[0].isread = 0;
}
} else {
/* default case */
xfer->frbuffers[0].isread = isread;
}
/*
* Setup the "page_start" pointer which points to an array of
* USB pages where information about the physical address of a
* page will be stored. Also initialise the "isread" field of
* the USB page caches.
*/
xfer->frbuffers[0].page_start = pg;
info->dma_nframes = nframes;
info->dma_currframe = 0;
info->dma_frlength_0 = frlength_0;
pg += (frlength_0 / USB_PAGE_SIZE);
pg += 2;
while (--nframes > 0) {
xfer->frbuffers[nframes].isread = isread;
xfer->frbuffers[nframes].page_start = pg;
pg += (xfer->frlengths[nframes] / USB_PAGE_SIZE);
pg += 2;
}
}
if (info->dma_error) {
USB_BUS_LOCK(info->bus);
usbd_transfer_done(xfer, USB_ERR_DMA_LOAD_FAILED);
USB_BUS_UNLOCK(info->bus);
return;
}
if (info->dma_currframe != info->dma_nframes) {
if (info->dma_currframe == 0) {
/* special case */
usb_pc_load_mem(xfer->frbuffers,
info->dma_frlength_0, 0);
} else {
/* default case */
nframes = info->dma_currframe;
usb_pc_load_mem(xfer->frbuffers + nframes,
xfer->frlengths[nframes], 0);
}
/* advance frame index */
info->dma_currframe++;
return;
}
/* go ahead */
usb_bdma_pre_sync(xfer);
/* start loading next USB transfer, if any */
usb_command_wrapper(pq, NULL);
/* finally start the hardware */
usbd_pipe_enter(xfer);
}
/*------------------------------------------------------------------------*
* usb_bdma_done_event
*
* This function is called when the BUS-DMA has loaded virtual memory
* into DMA, if any.
*------------------------------------------------------------------------*/
void
usb_bdma_done_event(struct usb_dma_parent_tag *udpt)
{
struct usb_xfer_root *info;
info = USB_DMATAG_TO_XROOT(udpt);
mtx_assert(info->xfer_mtx, MA_OWNED);
/* copy error */
info->dma_error = udpt->dma_error;
/* enter workloop again */
usb_command_wrapper(&info->dma_q,
info->dma_q.curr);
}
/*------------------------------------------------------------------------*
* usb_bdma_pre_sync
*
* This function handles DMA synchronisation that must be done before
* an USB transfer is started.
*------------------------------------------------------------------------*/
void
usb_bdma_pre_sync(struct usb_xfer *xfer)
{
struct usb_page_cache *pc;
usb_frcount_t nframes;
if (xfer->flags_int.isochronous_xfr) {
/* only one frame buffer */
nframes = 1;
} else {
/* can be multiple frame buffers */
nframes = xfer->nframes;
}
pc = xfer->frbuffers;
while (nframes--) {
if (pc->isread) {
usb_pc_cpu_invalidate(pc);
} else {
usb_pc_cpu_flush(pc);
}
pc++;
}
}
/*------------------------------------------------------------------------*
* usb_bdma_post_sync
*
* This function handles DMA synchronisation that must be done after
* an USB transfer is complete.
*------------------------------------------------------------------------*/
void
usb_bdma_post_sync(struct usb_xfer *xfer)
{
struct usb_page_cache *pc;
usb_frcount_t nframes;
if (xfer->flags_int.isochronous_xfr) {
/* only one frame buffer */
nframes = 1;
} else {
/* can be multiple frame buffers */
nframes = xfer->nframes;
}
pc = xfer->frbuffers;
while (nframes--) {
if (pc->isread) {
usb_pc_cpu_invalidate(pc);
}
pc++;
}
}
#endif