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freebsd-nq/sys/dev/usb/usb_transfer.c
Hans Petter Selasky 8b1ce3297a Optimise allocation of USB DMA structures. By default don't double map 
allocations if only one element should be allocated per page
cache. Make one allocation per element compile time configurable. Fix
a comment while at it.

Suggested by:	ian @
MFC after:	1 week
2015-02-02 11:32:15 +00:00

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/* $FreeBSD$ */
/*-
* 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.
*/
#ifdef USB_GLOBAL_INCLUDE_FILE
#include USB_GLOBAL_INCLUDE_FILE
#else
#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 <sys/proc.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_debug.h>
#include <dev/usb/usb_util.h>
#include <dev/usb/usb_controller.h>
#include <dev/usb/usb_bus.h>
#include <dev/usb/usb_pf.h>
#endif /* USB_GLOBAL_INCLUDE_FILE */
struct usb_std_packet_size {
struct {
uint16_t min; /* inclusive */
uint16_t max; /* inclusive */
} range;
uint16_t fixed[4];
};
static usb_callback_t usb_request_callback;
static const struct usb_config usb_control_ep_cfg[USB_CTRL_XFER_MAX] = {
/* This transfer is used for generic control endpoint transfers */
[0] = {
.type = UE_CONTROL,
.endpoint = 0x00, /* Control endpoint */
.direction = UE_DIR_ANY,
.bufsize = USB_EP0_BUFSIZE, /* bytes */
.flags = {.proxy_buffer = 1,},
.callback = &usb_request_callback,
.usb_mode = USB_MODE_DUAL, /* both modes */
},
/* This transfer is used for generic clear stall only */
[1] = {
.type = UE_CONTROL,
.endpoint = 0x00, /* Control pipe */
.direction = UE_DIR_ANY,
.bufsize = sizeof(struct usb_device_request),
.callback = &usb_do_clear_stall_callback,
.timeout = 1000, /* 1 second */
.interval = 50, /* 50ms */
.usb_mode = USB_MODE_HOST,
},
};
/* function prototypes */
static void usbd_update_max_frame_size(struct usb_xfer *);
static void usbd_transfer_unsetup_sub(struct usb_xfer_root *, uint8_t);
static void usbd_control_transfer_init(struct usb_xfer *);
static int usbd_setup_ctrl_transfer(struct usb_xfer *);
static void usb_callback_proc(struct usb_proc_msg *);
static void usbd_callback_ss_done_defer(struct usb_xfer *);
static void usbd_callback_wrapper(struct usb_xfer_queue *);
static void usbd_transfer_start_cb(void *);
static uint8_t usbd_callback_wrapper_sub(struct usb_xfer *);
static void usbd_get_std_packet_size(struct usb_std_packet_size *ptr,
uint8_t type, enum usb_dev_speed speed);
/*------------------------------------------------------------------------*
* usb_request_callback
*------------------------------------------------------------------------*/
static void
usb_request_callback(struct usb_xfer *xfer, usb_error_t error)
{
if (xfer->flags_int.usb_mode == USB_MODE_DEVICE)
usb_handle_request_callback(xfer, error);
else
usbd_do_request_callback(xfer, error);
}
/*------------------------------------------------------------------------*
* usbd_update_max_frame_size
*
* This function updates the maximum frame size, hence high speed USB
* can transfer multiple consecutive packets.
*------------------------------------------------------------------------*/
static void
usbd_update_max_frame_size(struct usb_xfer *xfer)
{
/* compute maximum frame size */
/* this computation should not overflow 16-bit */
/* max = 15 * 1024 */
xfer->max_frame_size = xfer->max_packet_size * xfer->max_packet_count;
}
/*------------------------------------------------------------------------*
* usbd_get_dma_delay
*
* The following function is called when we need to
* synchronize with DMA hardware.
*
* Returns:
* 0: no DMA delay required
* Else: milliseconds of DMA delay
*------------------------------------------------------------------------*/
usb_timeout_t
usbd_get_dma_delay(struct usb_device *udev)
{
const struct usb_bus_methods *mtod;
uint32_t temp;
mtod = udev->bus->methods;
temp = 0;
if (mtod->get_dma_delay) {
(mtod->get_dma_delay) (udev, &temp);
/*
* Round up and convert to milliseconds. Note that we use
* 1024 milliseconds per second. to save a division.
*/
temp += 0x3FF;
temp /= 0x400;
}
return (temp);
}
/*------------------------------------------------------------------------*
* usbd_transfer_setup_sub_malloc
*
* This function will allocate one or more DMA'able memory chunks
* according to "size", "align" and "count" arguments. "ppc" is
* pointed to a linear array of USB page caches afterwards.
*
* If the "align" argument is equal to "1" a non-contiguous allocation
* can happen. Else if the "align" argument is greater than "1", the
* allocation will always be contiguous in memory.
*
* Returns:
* 0: Success
* Else: Failure
*------------------------------------------------------------------------*/
#if USB_HAVE_BUSDMA
uint8_t
usbd_transfer_setup_sub_malloc(struct usb_setup_params *parm,
struct usb_page_cache **ppc, usb_size_t size, usb_size_t align,
usb_size_t count)
{
struct usb_page_cache *pc;
struct usb_page *pg;
void *buf;
usb_size_t n_dma_pc;
usb_size_t n_dma_pg;
usb_size_t n_obj;
usb_size_t x;
usb_size_t y;
usb_size_t r;
usb_size_t z;
USB_ASSERT(align > 0, ("Invalid alignment, 0x%08x\n",
align));
USB_ASSERT(size > 0, ("Invalid size = 0\n"));
if (count == 0) {
return (0); /* nothing to allocate */
}
/*
* Make sure that the size is aligned properly.
*/
size = -((-size) & (-align));
/*
* Try multi-allocation chunks to reduce the number of DMA
* allocations, hence DMA allocations are slow.
*/
if (align == 1) {
/* special case - non-cached multi page DMA memory */
n_dma_pc = count;
n_dma_pg = (2 + (size / USB_PAGE_SIZE));
n_obj = 1;
} else if (size >= USB_PAGE_SIZE) {
n_dma_pc = count;
n_dma_pg = 1;
n_obj = 1;
} else {
/* compute number of objects per page */
#ifdef USB_DMA_SINGLE_ALLOC
n_obj = 1;
#else
n_obj = (USB_PAGE_SIZE / size);
#endif
/*
* Compute number of DMA chunks, rounded up
* to nearest one:
*/
n_dma_pc = ((count + n_obj - 1) / n_obj);
n_dma_pg = 1;
}
/*
* DMA memory is allocated once, but mapped twice. That's why
* there is one list for auto-free and another list for
* non-auto-free which only holds the mapping and not the
* allocation.
*/
if (parm->buf == NULL) {
/* reserve memory (auto-free) */
parm->dma_page_ptr += n_dma_pc * n_dma_pg;
parm->dma_page_cache_ptr += n_dma_pc;
/* reserve memory (no-auto-free) */
parm->dma_page_ptr += count * n_dma_pg;
parm->xfer_page_cache_ptr += count;
return (0);
}
for (x = 0; x != n_dma_pc; x++) {
/* need to initialize the page cache */
parm->dma_page_cache_ptr[x].tag_parent =
&parm->curr_xfer->xroot->dma_parent_tag;
}
for (x = 0; x != count; x++) {
/* need to initialize the page cache */
parm->xfer_page_cache_ptr[x].tag_parent =
&parm->curr_xfer->xroot->dma_parent_tag;
}
if (ppc != NULL) {
if (n_obj != 1)
*ppc = parm->xfer_page_cache_ptr;
else
*ppc = parm->dma_page_cache_ptr;
}
r = count; /* set remainder count */
z = n_obj * size; /* set allocation size */
pc = parm->xfer_page_cache_ptr;
pg = parm->dma_page_ptr;
if (n_obj == 1) {
/*
* Avoid mapping memory twice if only a single object
* should be allocated per page cache:
*/
for (x = 0; x != n_dma_pc; x++) {
if (usb_pc_alloc_mem(parm->dma_page_cache_ptr,
pg, z, align)) {
return (1); /* failure */
}
/* Make room for one DMA page cache and "n_dma_pg" pages */
parm->dma_page_cache_ptr++;
pg += n_dma_pg;
}
} else {
for (x = 0; x != n_dma_pc; x++) {
if (r < n_obj) {
/* compute last remainder */
z = r * size;
n_obj = r;
}
if (usb_pc_alloc_mem(parm->dma_page_cache_ptr,
pg, z, align)) {
return (1); /* failure */
}
/* Set beginning of current buffer */
buf = parm->dma_page_cache_ptr->buffer;
/* Make room for one DMA page cache and "n_dma_pg" pages */
parm->dma_page_cache_ptr++;
pg += n_dma_pg;
for (y = 0; (y != n_obj); y++, r--, pc++, pg += n_dma_pg) {
/* Load sub-chunk into DMA */
if (usb_pc_dmamap_create(pc, size)) {
return (1); /* failure */
}
pc->buffer = USB_ADD_BYTES(buf, y * size);
pc->page_start = pg;
mtx_lock(pc->tag_parent->mtx);
if (usb_pc_load_mem(pc, size, 1 /* synchronous */ )) {
mtx_unlock(pc->tag_parent->mtx);
return (1); /* failure */
}
mtx_unlock(pc->tag_parent->mtx);
}
}
}
parm->xfer_page_cache_ptr = pc;
parm->dma_page_ptr = pg;
return (0);
}
#endif
/*------------------------------------------------------------------------*
* usbd_transfer_setup_sub - transfer setup subroutine
*
* This function must be called from the "xfer_setup" callback of the
* USB Host or Device controller driver when setting up an USB
* transfer. This function will setup correct packet sizes, buffer
* sizes, flags and more, that are stored in the "usb_xfer"
* structure.
*------------------------------------------------------------------------*/
void
usbd_transfer_setup_sub(struct usb_setup_params *parm)
{
enum {
REQ_SIZE = 8,
MIN_PKT = 8,
};
struct usb_xfer *xfer = parm->curr_xfer;
const struct usb_config *setup = parm->curr_setup;
struct usb_endpoint_ss_comp_descriptor *ecomp;
struct usb_endpoint_descriptor *edesc;
struct usb_std_packet_size std_size;
usb_frcount_t n_frlengths;
usb_frcount_t n_frbuffers;
usb_frcount_t x;
uint16_t maxp_old;
uint8_t type;
uint8_t zmps;
/*
* Sanity check. The following parameters must be initialized before
* calling this function.
*/
if ((parm->hc_max_packet_size == 0) ||
(parm->hc_max_packet_count == 0) ||
(parm->hc_max_frame_size == 0)) {
parm->err = USB_ERR_INVAL;
goto done;
}
edesc = xfer->endpoint->edesc;
ecomp = xfer->endpoint->ecomp;
type = (edesc->bmAttributes & UE_XFERTYPE);
xfer->flags = setup->flags;
xfer->nframes = setup->frames;
xfer->timeout = setup->timeout;
xfer->callback = setup->callback;
xfer->interval = setup->interval;
xfer->endpointno = edesc->bEndpointAddress;
xfer->max_packet_size = UGETW(edesc->wMaxPacketSize);
xfer->max_packet_count = 1;
/* make a shadow copy: */
xfer->flags_int.usb_mode = parm->udev->flags.usb_mode;
parm->bufsize = setup->bufsize;
switch (parm->speed) {
case USB_SPEED_HIGH:
switch (type) {
case UE_ISOCHRONOUS:
case UE_INTERRUPT:
xfer->max_packet_count +=
(xfer->max_packet_size >> 11) & 3;
/* check for invalid max packet count */
if (xfer->max_packet_count > 3)
xfer->max_packet_count = 3;
break;
default:
break;
}
xfer->max_packet_size &= 0x7FF;
break;
case USB_SPEED_SUPER:
xfer->max_packet_count += (xfer->max_packet_size >> 11) & 3;
if (ecomp != NULL)
xfer->max_packet_count += ecomp->bMaxBurst;
if ((xfer->max_packet_count == 0) ||
(xfer->max_packet_count > 16))
xfer->max_packet_count = 16;
switch (type) {
case UE_CONTROL:
xfer->max_packet_count = 1;
break;
case UE_ISOCHRONOUS:
if (ecomp != NULL) {
uint8_t mult;
mult = UE_GET_SS_ISO_MULT(
ecomp->bmAttributes) + 1;
if (mult > 3)
mult = 3;
xfer->max_packet_count *= mult;
}
break;
default:
break;
}
xfer->max_packet_size &= 0x7FF;
break;
default:
break;
}
/* range check "max_packet_count" */
if (xfer->max_packet_count > parm->hc_max_packet_count) {
xfer->max_packet_count = parm->hc_max_packet_count;
}
/* store max packet size value before filtering */
maxp_old = xfer->max_packet_size;
/* filter "wMaxPacketSize" according to HC capabilities */
if ((xfer->max_packet_size > parm->hc_max_packet_size) ||
(xfer->max_packet_size == 0)) {
xfer->max_packet_size = parm->hc_max_packet_size;
}
/* filter "wMaxPacketSize" according to standard sizes */
usbd_get_std_packet_size(&std_size, type, parm->speed);
if (std_size.range.min || std_size.range.max) {
if (xfer->max_packet_size < std_size.range.min) {
xfer->max_packet_size = std_size.range.min;
}
if (xfer->max_packet_size > std_size.range.max) {
xfer->max_packet_size = std_size.range.max;
}
} else {
if (xfer->max_packet_size >= std_size.fixed[3]) {
xfer->max_packet_size = std_size.fixed[3];
} else if (xfer->max_packet_size >= std_size.fixed[2]) {
xfer->max_packet_size = std_size.fixed[2];
} else if (xfer->max_packet_size >= std_size.fixed[1]) {
xfer->max_packet_size = std_size.fixed[1];
} else {
/* only one possibility left */
xfer->max_packet_size = std_size.fixed[0];
}
}
/*
* Check if the max packet size was outside its allowed range
* and clamped to a valid value:
*/
if (maxp_old != xfer->max_packet_size)
xfer->flags_int.maxp_was_clamped = 1;
/* compute "max_frame_size" */
usbd_update_max_frame_size(xfer);
/* check interrupt interval and transfer pre-delay */
if (type == UE_ISOCHRONOUS) {
uint16_t frame_limit;
xfer->interval = 0; /* not used, must be zero */
xfer->flags_int.isochronous_xfr = 1; /* set flag */
if (xfer->timeout == 0) {
/*
* set a default timeout in
* case something goes wrong!
*/
xfer->timeout = 1000 / 4;
}
switch (parm->speed) {
case USB_SPEED_LOW:
case USB_SPEED_FULL:
frame_limit = USB_MAX_FS_ISOC_FRAMES_PER_XFER;
xfer->fps_shift = 0;
break;
default:
frame_limit = USB_MAX_HS_ISOC_FRAMES_PER_XFER;
xfer->fps_shift = edesc->bInterval;
if (xfer->fps_shift > 0)
xfer->fps_shift--;
if (xfer->fps_shift > 3)
xfer->fps_shift = 3;
if (xfer->flags.pre_scale_frames != 0)
xfer->nframes <<= (3 - xfer->fps_shift);
break;
}
if (xfer->nframes > frame_limit) {
/*
* this is not going to work
* cross hardware
*/
parm->err = USB_ERR_INVAL;
goto done;
}
if (xfer->nframes == 0) {
/*
* this is not a valid value
*/
parm->err = USB_ERR_ZERO_NFRAMES;
goto done;
}
} else {
/*
* If a value is specified use that else check the
* endpoint descriptor!
*/
if (type == UE_INTERRUPT) {
uint32_t temp;
if (xfer->interval == 0) {
xfer->interval = edesc->bInterval;
switch (parm->speed) {
case USB_SPEED_LOW:
case USB_SPEED_FULL:
break;
default:
/* 125us -> 1ms */
if (xfer->interval < 4)
xfer->interval = 1;
else if (xfer->interval > 16)
xfer->interval = (1 << (16 - 4));
else
xfer->interval =
(1 << (xfer->interval - 4));
break;
}
}
if (xfer->interval == 0) {
/*
* One millisecond is the smallest
* interval we support:
*/
xfer->interval = 1;
}
xfer->fps_shift = 0;
temp = 1;
while ((temp != 0) && (temp < xfer->interval)) {
xfer->fps_shift++;
temp *= 2;
}
switch (parm->speed) {
case USB_SPEED_LOW:
case USB_SPEED_FULL:
break;
default:
xfer->fps_shift += 3;
break;
}
}
}
/*
* NOTE: we do not allow "max_packet_size" or "max_frame_size"
* to be equal to zero when setting up USB transfers, hence
* this leads to alot of extra code in the USB kernel.
*/
if ((xfer->max_frame_size == 0) ||
(xfer->max_packet_size == 0)) {
zmps = 1;
if ((parm->bufsize <= MIN_PKT) &&
(type != UE_CONTROL) &&
(type != UE_BULK)) {
/* workaround */
xfer->max_packet_size = MIN_PKT;
xfer->max_packet_count = 1;
parm->bufsize = 0; /* automatic setup length */
usbd_update_max_frame_size(xfer);
} else {
parm->err = USB_ERR_ZERO_MAXP;
goto done;
}
} else {
zmps = 0;
}
/*
* check if we should setup a default
* length:
*/
if (parm->bufsize == 0) {
parm->bufsize = xfer->max_frame_size;
if (type == UE_ISOCHRONOUS) {
parm->bufsize *= xfer->nframes;
}
}
/*
* check if we are about to setup a proxy
* type of buffer:
*/
if (xfer->flags.proxy_buffer) {
/* round bufsize up */
parm->bufsize += (xfer->max_frame_size - 1);
if (parm->bufsize < xfer->max_frame_size) {
/* length wrapped around */
parm->err = USB_ERR_INVAL;
goto done;
}
/* subtract remainder */
parm->bufsize -= (parm->bufsize % xfer->max_frame_size);
/* add length of USB device request structure, if any */
if (type == UE_CONTROL) {
parm->bufsize += REQ_SIZE; /* SETUP message */
}
}
xfer->max_data_length = parm->bufsize;
/* Setup "n_frlengths" and "n_frbuffers" */
if (type == UE_ISOCHRONOUS) {
n_frlengths = xfer->nframes;
n_frbuffers = 1;
} else {
if (type == UE_CONTROL) {
xfer->flags_int.control_xfr = 1;
if (xfer->nframes == 0) {
if (parm->bufsize <= REQ_SIZE) {
/*
* there will never be any data
* stage
*/
xfer->nframes = 1;
} else {
xfer->nframes = 2;
}
}
} else {
if (xfer->nframes == 0) {
xfer->nframes = 1;
}
}
n_frlengths = xfer->nframes;
n_frbuffers = xfer->nframes;
}
/*
* check if we have room for the
* USB device request structure:
*/
if (type == UE_CONTROL) {
if (xfer->max_data_length < REQ_SIZE) {
/* length wrapped around or too small bufsize */
parm->err = USB_ERR_INVAL;
goto done;
}
xfer->max_data_length -= REQ_SIZE;
}
/*
* Setup "frlengths" and shadow "frlengths" for keeping the
* initial frame lengths when a USB transfer is complete. This
* information is useful when computing isochronous offsets.
*/
xfer->frlengths = parm->xfer_length_ptr;
parm->xfer_length_ptr += 2 * n_frlengths;
/* setup "frbuffers" */
xfer->frbuffers = parm->xfer_page_cache_ptr;
parm->xfer_page_cache_ptr += n_frbuffers;
/* initialize max frame count */
xfer->max_frame_count = xfer->nframes;
/*
* check if we need to setup
* a local buffer:
*/
if (!xfer->flags.ext_buffer) {
#if USB_HAVE_BUSDMA
struct usb_page_search page_info;
struct usb_page_cache *pc;
if (usbd_transfer_setup_sub_malloc(parm,
&pc, parm->bufsize, 1, 1)) {
parm->err = USB_ERR_NOMEM;
} else if (parm->buf != NULL) {
usbd_get_page(pc, 0, &page_info);
xfer->local_buffer = page_info.buffer;
usbd_xfer_set_frame_offset(xfer, 0, 0);
if ((type == UE_CONTROL) && (n_frbuffers > 1)) {
usbd_xfer_set_frame_offset(xfer, REQ_SIZE, 1);
}
}
#else
/* align data */
parm->size[0] += ((-parm->size[0]) & (USB_HOST_ALIGN - 1));
if (parm->buf != NULL) {
xfer->local_buffer =
USB_ADD_BYTES(parm->buf, parm->size[0]);
usbd_xfer_set_frame_offset(xfer, 0, 0);
if ((type == UE_CONTROL) && (n_frbuffers > 1)) {
usbd_xfer_set_frame_offset(xfer, REQ_SIZE, 1);
}
}
parm->size[0] += parm->bufsize;
/* align data again */
parm->size[0] += ((-parm->size[0]) & (USB_HOST_ALIGN - 1));
#endif
}
/*
* Compute maximum buffer size
*/
if (parm->bufsize_max < parm->bufsize) {
parm->bufsize_max = parm->bufsize;
}
#if USB_HAVE_BUSDMA
if (xfer->flags_int.bdma_enable) {
/*
* Setup "dma_page_ptr".
*
* Proof for formula below:
*
* Assume there are three USB frames having length "a", "b" and
* "c". These USB frames will at maximum need "z"
* "usb_page" structures. "z" is given by:
*
* z = ((a / USB_PAGE_SIZE) + 2) + ((b / USB_PAGE_SIZE) + 2) +
* ((c / USB_PAGE_SIZE) + 2);
*
* Constraining "a", "b" and "c" like this:
*
* (a + b + c) <= parm->bufsize
*
* We know that:
*
* z <= ((parm->bufsize / USB_PAGE_SIZE) + (3*2));
*
* Here is the general formula:
*/
xfer->dma_page_ptr = parm->dma_page_ptr;
parm->dma_page_ptr += (2 * n_frbuffers);
parm->dma_page_ptr += (parm->bufsize / USB_PAGE_SIZE);
}
#endif
if (zmps) {
/* correct maximum data length */
xfer->max_data_length = 0;
}
/* subtract USB frame remainder from "hc_max_frame_size" */
xfer->max_hc_frame_size =
(parm->hc_max_frame_size -
(parm->hc_max_frame_size % xfer->max_frame_size));
if (xfer->max_hc_frame_size == 0) {
parm->err = USB_ERR_INVAL;
goto done;
}
/* initialize frame buffers */
if (parm->buf) {
for (x = 0; x != n_frbuffers; x++) {
xfer->frbuffers[x].tag_parent =
&xfer->xroot->dma_parent_tag;
#if USB_HAVE_BUSDMA
if (xfer->flags_int.bdma_enable &&
(parm->bufsize_max > 0)) {
if (usb_pc_dmamap_create(
xfer->frbuffers + x,
parm->bufsize_max)) {
parm->err = USB_ERR_NOMEM;
goto done;
}
}
#endif
}
}
done:
if (parm->err) {
/*
* Set some dummy values so that we avoid division by zero:
*/
xfer->max_hc_frame_size = 1;
xfer->max_frame_size = 1;
xfer->max_packet_size = 1;
xfer->max_data_length = 0;
xfer->nframes = 0;
xfer->max_frame_count = 0;
}
}
/*------------------------------------------------------------------------*
* usbd_transfer_setup - setup an array of USB transfers
*
* NOTE: You must always call "usbd_transfer_unsetup" after calling
* "usbd_transfer_setup" if success was returned.
*
* The idea is that the USB device driver should pre-allocate all its
* transfers by one call to this function.
*
* Return values:
* 0: Success
* Else: Failure
*------------------------------------------------------------------------*/
usb_error_t
usbd_transfer_setup(struct usb_device *udev,
const uint8_t *ifaces, struct usb_xfer **ppxfer,
const struct usb_config *setup_start, uint16_t n_setup,
void *priv_sc, struct mtx *xfer_mtx)
{
const struct usb_config *setup_end = setup_start + n_setup;
const struct usb_config *setup;
struct usb_setup_params *parm;
struct usb_endpoint *ep;
struct usb_xfer_root *info;
struct usb_xfer *xfer;
void *buf = NULL;
usb_error_t error = 0;
uint16_t n;
uint16_t refcount;
uint8_t do_unlock;
WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL,
"usbd_transfer_setup can sleep!");
/* do some checking first */
if (n_setup == 0) {
DPRINTFN(6, "setup array has zero length!\n");
return (USB_ERR_INVAL);
}
if (ifaces == 0) {
DPRINTFN(6, "ifaces array is NULL!\n");
return (USB_ERR_INVAL);
}
if (xfer_mtx == NULL) {
DPRINTFN(6, "using global lock\n");
xfer_mtx = &Giant;
}
/* more sanity checks */
for (setup = setup_start, n = 0;
setup != setup_end; setup++, n++) {
if (setup->bufsize == (usb_frlength_t)-1) {
error = USB_ERR_BAD_BUFSIZE;
DPRINTF("invalid bufsize\n");
}
if (setup->callback == NULL) {
error = USB_ERR_NO_CALLBACK;
DPRINTF("no callback\n");
}
ppxfer[n] = NULL;
}
if (error)
return (error);
/* Protect scratch area */
do_unlock = usbd_enum_lock(udev);
refcount = 0;
info = NULL;
parm = &udev->scratch.xfer_setup[0].parm;
memset(parm, 0, sizeof(*parm));
parm->udev = udev;
parm->speed = usbd_get_speed(udev);
parm->hc_max_packet_count = 1;
if (parm->speed >= USB_SPEED_MAX) {
parm->err = USB_ERR_INVAL;
goto done;
}
/* setup all transfers */
while (1) {
if (buf) {
/*
* Initialize the "usb_xfer_root" structure,
* which is common for all our USB transfers.
*/
info = USB_ADD_BYTES(buf, 0);
info->memory_base = buf;
info->memory_size = parm->size[0];
#if USB_HAVE_BUSDMA
info->dma_page_cache_start = USB_ADD_BYTES(buf, parm->size[4]);
info->dma_page_cache_end = USB_ADD_BYTES(buf, parm->size[5]);
#endif
info->xfer_page_cache_start = USB_ADD_BYTES(buf, parm->size[5]);
info->xfer_page_cache_end = USB_ADD_BYTES(buf, parm->size[2]);
cv_init(&info->cv_drain, "WDRAIN");
info->xfer_mtx = xfer_mtx;
#if USB_HAVE_BUSDMA
usb_dma_tag_setup(&info->dma_parent_tag,
parm->dma_tag_p, udev->bus->dma_parent_tag[0].tag,
xfer_mtx, &usb_bdma_done_event, udev->bus->dma_bits,
parm->dma_tag_max);
#endif
info->bus = udev->bus;
info->udev = udev;
TAILQ_INIT(&info->done_q.head);
info->done_q.command = &usbd_callback_wrapper;
#if USB_HAVE_BUSDMA
TAILQ_INIT(&info->dma_q.head);
info->dma_q.command = &usb_bdma_work_loop;
#endif
info->done_m[0].hdr.pm_callback = &usb_callback_proc;
info->done_m[0].xroot = info;
info->done_m[1].hdr.pm_callback = &usb_callback_proc;
info->done_m[1].xroot = info;
/*
* In device side mode control endpoint
* requests need to run from a separate
* context, else there is a chance of
* deadlock!
*/
if (setup_start == usb_control_ep_cfg)
info->done_p =
USB_BUS_CONTROL_XFER_PROC(udev->bus);
else if (xfer_mtx == &Giant)
info->done_p =
USB_BUS_GIANT_PROC(udev->bus);
else
info->done_p =
USB_BUS_NON_GIANT_PROC(udev->bus);
}
/* reset sizes */
parm->size[0] = 0;
parm->buf = buf;
parm->size[0] += sizeof(info[0]);
for (setup = setup_start, n = 0;
setup != setup_end; setup++, n++) {
/* skip USB transfers without callbacks: */
if (setup->callback == NULL) {
continue;
}
/* see if there is a matching endpoint */
ep = usbd_get_endpoint(udev,
ifaces[setup->if_index], setup);
/*
* Check that the USB PIPE is valid and that
* the endpoint mode is proper.
*
* Make sure we don't allocate a streams
* transfer when such a combination is not
* valid.
*/
if ((ep == NULL) || (ep->methods == NULL) ||
((ep->ep_mode != USB_EP_MODE_STREAMS) &&
(ep->ep_mode != USB_EP_MODE_DEFAULT)) ||
(setup->stream_id != 0 &&
(setup->stream_id >= USB_MAX_EP_STREAMS ||
(ep->ep_mode != USB_EP_MODE_STREAMS)))) {
if (setup->flags.no_pipe_ok)
continue;
if ((setup->usb_mode != USB_MODE_DUAL) &&
(setup->usb_mode != udev->flags.usb_mode))
continue;
parm->err = USB_ERR_NO_PIPE;
goto done;
}
/* align data properly */
parm->size[0] += ((-parm->size[0]) & (USB_HOST_ALIGN - 1));
/* store current setup pointer */
parm->curr_setup = setup;
if (buf) {
/*
* Common initialization of the
* "usb_xfer" structure.
*/
xfer = USB_ADD_BYTES(buf, parm->size[0]);
xfer->address = udev->address;
xfer->priv_sc = priv_sc;
xfer->xroot = info;
usb_callout_init_mtx(&xfer->timeout_handle,
&udev->bus->bus_mtx, 0);
} else {
/*
* Setup a dummy xfer, hence we are
* writing to the "usb_xfer"
* structure pointed to by "xfer"
* before we have allocated any
* memory:
*/
xfer = &udev->scratch.xfer_setup[0].dummy;
memset(xfer, 0, sizeof(*xfer));
refcount++;
}
/* set transfer endpoint pointer */
xfer->endpoint = ep;
/* set transfer stream ID */
xfer->stream_id = setup->stream_id;
parm->size[0] += sizeof(xfer[0]);
parm->methods = xfer->endpoint->methods;
parm->curr_xfer = xfer;
/*
* Call the Host or Device controller transfer
* setup routine:
*/
(udev->bus->methods->xfer_setup) (parm);
/* check for error */
if (parm->err)
goto done;
if (buf) {
/*
* Increment the endpoint refcount. This
* basically prevents setting a new
* configuration and alternate setting
* when USB transfers are in use on
* the given interface. Search the USB
* code for "endpoint->refcount_alloc" if you
* want more information.
*/
USB_BUS_LOCK(info->bus);
if (xfer->endpoint->refcount_alloc >= USB_EP_REF_MAX)
parm->err = USB_ERR_INVAL;
xfer->endpoint->refcount_alloc++;
if (xfer->endpoint->refcount_alloc == 0)
panic("usbd_transfer_setup(): Refcount wrapped to zero\n");
USB_BUS_UNLOCK(info->bus);
/*
* Whenever we set ppxfer[] then we
* also need to increment the
* "setup_refcount":
*/
info->setup_refcount++;
/*
* Transfer is successfully setup and
* can be used:
*/
ppxfer[n] = xfer;
}
/* check for error */
if (parm->err)
goto done;
}
if (buf != NULL || parm->err != 0)
goto done;
/* if no transfers, nothing to do */
if (refcount == 0)
goto done;
/* align data properly */
parm->size[0] += ((-parm->size[0]) & (USB_HOST_ALIGN - 1));
/* store offset temporarily */
parm->size[1] = parm->size[0];
/*
* The number of DMA tags required depends on
* the number of endpoints. The current estimate
* for maximum number of DMA tags per endpoint
* is three:
* 1) for loading memory
* 2) for allocating memory
* 3) for fixing memory [UHCI]
*/
parm->dma_tag_max += 3 * MIN(n_setup, USB_EP_MAX);
/*
* DMA tags for QH, TD, Data and more.
*/
parm->dma_tag_max += 8;
parm->dma_tag_p += parm->dma_tag_max;
parm->size[0] += ((uint8_t *)parm->dma_tag_p) -
((uint8_t *)0);
/* align data properly */
parm->size[0] += ((-parm->size[0]) & (USB_HOST_ALIGN - 1));
/* store offset temporarily */
parm->size[3] = parm->size[0];
parm->size[0] += ((uint8_t *)parm->dma_page_ptr) -
((uint8_t *)0);
/* align data properly */
parm->size[0] += ((-parm->size[0]) & (USB_HOST_ALIGN - 1));
/* store offset temporarily */
parm->size[4] = parm->size[0];
parm->size[0] += ((uint8_t *)parm->dma_page_cache_ptr) -
((uint8_t *)0);
/* store end offset temporarily */
parm->size[5] = parm->size[0];
parm->size[0] += ((uint8_t *)parm->xfer_page_cache_ptr) -
((uint8_t *)0);
/* store end offset temporarily */
parm->size[2] = parm->size[0];
/* align data properly */
parm->size[0] += ((-parm->size[0]) & (USB_HOST_ALIGN - 1));
parm->size[6] = parm->size[0];
parm->size[0] += ((uint8_t *)parm->xfer_length_ptr) -
((uint8_t *)0);
/* align data properly */
parm->size[0] += ((-parm->size[0]) & (USB_HOST_ALIGN - 1));
/* allocate zeroed memory */
buf = malloc(parm->size[0], M_USB, M_WAITOK | M_ZERO);
if (buf == NULL) {
parm->err = USB_ERR_NOMEM;
DPRINTFN(0, "cannot allocate memory block for "
"configuration (%d bytes)\n",
parm->size[0]);
goto done;
}
parm->dma_tag_p = USB_ADD_BYTES(buf, parm->size[1]);
parm->dma_page_ptr = USB_ADD_BYTES(buf, parm->size[3]);
parm->dma_page_cache_ptr = USB_ADD_BYTES(buf, parm->size[4]);
parm->xfer_page_cache_ptr = USB_ADD_BYTES(buf, parm->size[5]);
parm->xfer_length_ptr = USB_ADD_BYTES(buf, parm->size[6]);
}
done:
if (buf) {
if (info->setup_refcount == 0) {
/*
* "usbd_transfer_unsetup_sub" will unlock
* the bus mutex before returning !
*/
USB_BUS_LOCK(info->bus);
/* something went wrong */
usbd_transfer_unsetup_sub(info, 0);
}
}
/* check if any errors happened */
if (parm->err)
usbd_transfer_unsetup(ppxfer, n_setup);
error = parm->err;
if (do_unlock)
usbd_enum_unlock(udev);
return (error);
}
/*------------------------------------------------------------------------*
* usbd_transfer_unsetup_sub - factored out code
*------------------------------------------------------------------------*/
static void
usbd_transfer_unsetup_sub(struct usb_xfer_root *info, uint8_t needs_delay)
{
#if USB_HAVE_BUSDMA
struct usb_page_cache *pc;
#endif
USB_BUS_LOCK_ASSERT(info->bus, MA_OWNED);
/* wait for any outstanding DMA operations */
if (needs_delay) {
usb_timeout_t temp;
temp = usbd_get_dma_delay(info->udev);
if (temp != 0) {
usb_pause_mtx(&info->bus->bus_mtx,
USB_MS_TO_TICKS(temp));
}
}
/* make sure that our done messages are not queued anywhere */
usb_proc_mwait(info->done_p, &info->done_m[0], &info->done_m[1]);
USB_BUS_UNLOCK(info->bus);
#if USB_HAVE_BUSDMA
/* free DMA'able memory, if any */
pc = info->dma_page_cache_start;
while (pc != info->dma_page_cache_end) {
usb_pc_free_mem(pc);
pc++;
}
/* free DMA maps in all "xfer->frbuffers" */
pc = info->xfer_page_cache_start;
while (pc != info->xfer_page_cache_end) {
usb_pc_dmamap_destroy(pc);
pc++;
}
/* free all DMA tags */
usb_dma_tag_unsetup(&info->dma_parent_tag);
#endif
cv_destroy(&info->cv_drain);
/*
* free the "memory_base" last, hence the "info" structure is
* contained within the "memory_base"!
*/
free(info->memory_base, M_USB);
}
/*------------------------------------------------------------------------*
* usbd_transfer_unsetup - unsetup/free an array of USB transfers
*
* NOTE: All USB transfers in progress will get called back passing
* the error code "USB_ERR_CANCELLED" before this function
* returns.
*------------------------------------------------------------------------*/
void
usbd_transfer_unsetup(struct usb_xfer **pxfer, uint16_t n_setup)
{
struct usb_xfer *xfer;
struct usb_xfer_root *info;
uint8_t needs_delay = 0;
WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL,
"usbd_transfer_unsetup can sleep!");
while (n_setup--) {
xfer = pxfer[n_setup];
if (xfer == NULL)
continue;
info = xfer->xroot;
USB_XFER_LOCK(xfer);
USB_BUS_LOCK(info->bus);
/*
* HINT: when you start/stop a transfer, it might be a
* good idea to directly use the "pxfer[]" structure:
*
* usbd_transfer_start(sc->pxfer[0]);
* usbd_transfer_stop(sc->pxfer[0]);
*
* That way, if your code has many parts that will not
* stop running under the same lock, in other words
* "xfer_mtx", the usbd_transfer_start and
* usbd_transfer_stop functions will simply return
* when they detect a NULL pointer argument.
*
* To avoid any races we clear the "pxfer[]" pointer
* while holding the private mutex of the driver:
*/
pxfer[n_setup] = NULL;
USB_BUS_UNLOCK(info->bus);
USB_XFER_UNLOCK(xfer);
usbd_transfer_drain(xfer);
#if USB_HAVE_BUSDMA
if (xfer->flags_int.bdma_enable)
needs_delay = 1;
#endif
/*
* NOTE: default endpoint does not have an
* interface, even if endpoint->iface_index == 0
*/
USB_BUS_LOCK(info->bus);
xfer->endpoint->refcount_alloc--;
USB_BUS_UNLOCK(info->bus);
usb_callout_drain(&xfer->timeout_handle);
USB_BUS_LOCK(info->bus);
USB_ASSERT(info->setup_refcount != 0, ("Invalid setup "
"reference count\n"));
info->setup_refcount--;
if (info->setup_refcount == 0) {
usbd_transfer_unsetup_sub(info,
needs_delay);
} else {
USB_BUS_UNLOCK(info->bus);
}
}
}
/*------------------------------------------------------------------------*
* usbd_control_transfer_init - factored out code
*
* In USB Device Mode we have to wait for the SETUP packet which
* containst the "struct usb_device_request" structure, before we can
* transfer any data. In USB Host Mode we already have the SETUP
* packet at the moment the USB transfer is started. This leads us to
* having to setup the USB transfer at two different places in
* time. This function just contains factored out control transfer
* initialisation code, so that we don't duplicate the code.
*------------------------------------------------------------------------*/
static void
usbd_control_transfer_init(struct usb_xfer *xfer)
{
struct usb_device_request req;
/* copy out the USB request header */
usbd_copy_out(xfer->frbuffers, 0, &req, sizeof(req));
/* setup remainder */
xfer->flags_int.control_rem = UGETW(req.wLength);
/* copy direction to endpoint variable */
xfer->endpointno &= ~(UE_DIR_IN | UE_DIR_OUT);
xfer->endpointno |=
(req.bmRequestType & UT_READ) ? UE_DIR_IN : UE_DIR_OUT;
}
/*------------------------------------------------------------------------*
* usbd_control_transfer_did_data
*
* This function returns non-zero if a control endpoint has
* transferred the first DATA packet after the SETUP packet.
* Else it returns zero.
*------------------------------------------------------------------------*/
static uint8_t
usbd_control_transfer_did_data(struct usb_xfer *xfer)
{
struct usb_device_request req;
/* SETUP packet is not yet sent */
if (xfer->flags_int.control_hdr != 0)
return (0);
/* copy out the USB request header */
usbd_copy_out(xfer->frbuffers, 0, &req, sizeof(req));
/* compare remainder to the initial value */
return (xfer->flags_int.control_rem != UGETW(req.wLength));
}
/*------------------------------------------------------------------------*
* usbd_setup_ctrl_transfer
*
* This function handles initialisation of control transfers. Control
* transfers are special in that regard that they can both transmit
* and receive data.
*
* Return values:
* 0: Success
* Else: Failure
*------------------------------------------------------------------------*/
static int
usbd_setup_ctrl_transfer(struct usb_xfer *xfer)
{
usb_frlength_t len;
/* Check for control endpoint stall */
if (xfer->flags.stall_pipe && xfer->flags_int.control_act) {
/* the control transfer is no longer active */
xfer->flags_int.control_stall = 1;
xfer->flags_int.control_act = 0;
} else {
/* don't stall control transfer by default */
xfer->flags_int.control_stall = 0;
}
/* Check for invalid number of frames */
if (xfer->nframes > 2) {
/*
* If you need to split a control transfer, you
* have to do one part at a time. Only with
* non-control transfers you can do multiple
* parts a time.
*/
DPRINTFN(0, "Too many frames: %u\n",
(unsigned int)xfer->nframes);
goto error;
}
/*
* Check if there is a control
* transfer in progress:
*/
if (xfer->flags_int.control_act) {
if (xfer->flags_int.control_hdr) {
/* clear send header flag */
xfer->flags_int.control_hdr = 0;
/* setup control transfer */
if (xfer->flags_int.usb_mode == USB_MODE_DEVICE) {
usbd_control_transfer_init(xfer);
}
}
/* get data length */
len = xfer->sumlen;
} else {
/* the size of the SETUP structure is hardcoded ! */
if (xfer->frlengths[0] != sizeof(struct usb_device_request)) {
DPRINTFN(0, "Wrong framelength %u != %zu\n",
xfer->frlengths[0], sizeof(struct
usb_device_request));
goto error;
}
/* check USB mode */
if (xfer->flags_int.usb_mode == USB_MODE_DEVICE) {
/* check number of frames */
if (xfer->nframes != 1) {
/*
* We need to receive the setup
* message first so that we know the
* data direction!
*/
DPRINTF("Misconfigured transfer\n");
goto error;
}
/*
* Set a dummy "control_rem" value. This
* variable will be overwritten later by a
* call to "usbd_control_transfer_init()" !
*/
xfer->flags_int.control_rem = 0xFFFF;
} else {
/* setup "endpoint" and "control_rem" */
usbd_control_transfer_init(xfer);
}
/* set transfer-header flag */
xfer->flags_int.control_hdr = 1;
/* get data length */
len = (xfer->sumlen - sizeof(struct usb_device_request));
}
/* update did data flag */
xfer->flags_int.control_did_data =
usbd_control_transfer_did_data(xfer);
/* check if there is a length mismatch */
if (len > xfer->flags_int.control_rem) {
DPRINTFN(0, "Length (%d) greater than "
"remaining length (%d)\n", len,
xfer->flags_int.control_rem);
goto error;
}
/* check if we are doing a short transfer */
if (xfer->flags.force_short_xfer) {
xfer->flags_int.control_rem = 0;
} else {
if ((len != xfer->max_data_length) &&
(len != xfer->flags_int.control_rem) &&
(xfer->nframes != 1)) {
DPRINTFN(0, "Short control transfer without "
"force_short_xfer set\n");
goto error;
}
xfer->flags_int.control_rem -= len;
}
/* the status part is executed when "control_act" is 0 */
if ((xfer->flags_int.control_rem > 0) ||
(xfer->flags.manual_status)) {
/* don't execute the STATUS stage yet */
xfer->flags_int.control_act = 1;
/* sanity check */
if ((!xfer->flags_int.control_hdr) &&
(xfer->nframes == 1)) {
/*
* This is not a valid operation!
*/
DPRINTFN(0, "Invalid parameter "
"combination\n");
goto error;
}
} else {
/* time to execute the STATUS stage */
xfer->flags_int.control_act = 0;
}
return (0); /* success */
error:
return (1); /* failure */
}
/*------------------------------------------------------------------------*
* usbd_transfer_submit - start USB hardware for the given transfer
*
* This function should only be called from the USB callback.
*------------------------------------------------------------------------*/
void
usbd_transfer_submit(struct usb_xfer *xfer)
{
struct usb_xfer_root *info;
struct usb_bus *bus;
usb_frcount_t x;
info = xfer->xroot;
bus = info->bus;
DPRINTF("xfer=%p, endpoint=%p, nframes=%d, dir=%s\n",
xfer, xfer->endpoint, xfer->nframes, USB_GET_DATA_ISREAD(xfer) ?
"read" : "write");
#ifdef USB_DEBUG
if (USB_DEBUG_VAR > 0) {
USB_BUS_LOCK(bus);
usb_dump_endpoint(xfer->endpoint);
USB_BUS_UNLOCK(bus);
}
#endif
USB_XFER_LOCK_ASSERT(xfer, MA_OWNED);
USB_BUS_LOCK_ASSERT(bus, MA_NOTOWNED);
/* Only open the USB transfer once! */
if (!xfer->flags_int.open) {
xfer->flags_int.open = 1;
DPRINTF("open\n");
USB_BUS_LOCK(bus);
(xfer->endpoint->methods->open) (xfer);
USB_BUS_UNLOCK(bus);
}
/* set "transferring" flag */
xfer->flags_int.transferring = 1;
#if USB_HAVE_POWERD
/* increment power reference */
usbd_transfer_power_ref(xfer, 1);
#endif
/*
* Check if the transfer is waiting on a queue, most
* frequently the "done_q":
*/
if (xfer->wait_queue) {
USB_BUS_LOCK(bus);
usbd_transfer_dequeue(xfer);
USB_BUS_UNLOCK(bus);
}
/* clear "did_dma_delay" flag */
xfer->flags_int.did_dma_delay = 0;
/* clear "did_close" flag */
xfer->flags_int.did_close = 0;
#if USB_HAVE_BUSDMA
/* clear "bdma_setup" flag */
xfer->flags_int.bdma_setup = 0;
#endif
/* by default we cannot cancel any USB transfer immediately */
xfer->flags_int.can_cancel_immed = 0;
/* clear lengths and frame counts by default */
xfer->sumlen = 0;
xfer->actlen = 0;
xfer->aframes = 0;
/* clear any previous errors */
xfer->error = 0;
/* Check if the device is still alive */
if (info->udev->state < USB_STATE_POWERED) {
USB_BUS_LOCK(bus);
/*
* Must return cancelled error code else
* device drivers can hang.
*/
usbd_transfer_done(xfer, USB_ERR_CANCELLED);
USB_BUS_UNLOCK(bus);
return;
}
/* sanity check */
if (xfer->nframes == 0) {
if (xfer->flags.stall_pipe) {
/*
* Special case - want to stall without transferring
* any data:
*/
DPRINTF("xfer=%p nframes=0: stall "
"or clear stall!\n", xfer);
USB_BUS_LOCK(bus);
xfer->flags_int.can_cancel_immed = 1;
/* start the transfer */
usb_command_wrapper(&xfer->endpoint->
endpoint_q[xfer->stream_id], xfer);
USB_BUS_UNLOCK(bus);
return;
}
USB_BUS_LOCK(bus);
usbd_transfer_done(xfer, USB_ERR_INVAL);
USB_BUS_UNLOCK(bus);
return;
}
/* compute some variables */
for (x = 0; x != xfer->nframes; x++) {
/* make a copy of the frlenghts[] */
xfer->frlengths[x + xfer->max_frame_count] = xfer->frlengths[x];
/* compute total transfer length */
xfer->sumlen += xfer->frlengths[x];
if (xfer->sumlen < xfer->frlengths[x]) {
/* length wrapped around */
USB_BUS_LOCK(bus);
usbd_transfer_done(xfer, USB_ERR_INVAL);
USB_BUS_UNLOCK(bus);
return;
}
}
/* clear some internal flags */
xfer->flags_int.short_xfer_ok = 0;
xfer->flags_int.short_frames_ok = 0;
/* check if this is a control transfer */
if (xfer->flags_int.control_xfr) {
if (usbd_setup_ctrl_transfer(xfer)) {
USB_BUS_LOCK(bus);
usbd_transfer_done(xfer, USB_ERR_STALLED);
USB_BUS_UNLOCK(bus);
return;
}
}
/*
* Setup filtered version of some transfer flags,
* in case of data read direction
*/
if (USB_GET_DATA_ISREAD(xfer)) {
if (xfer->flags.short_frames_ok) {
xfer->flags_int.short_xfer_ok = 1;
xfer->flags_int.short_frames_ok = 1;
} else if (xfer->flags.short_xfer_ok) {
xfer->flags_int.short_xfer_ok = 1;
/* check for control transfer */
if (xfer->flags_int.control_xfr) {
/*
* 1) Control transfers do not support
* reception of multiple short USB
* frames in host mode and device side
* mode, with exception of:
*
* 2) Due to sometimes buggy device
* side firmware we need to do a
* STATUS stage in case of short
* control transfers in USB host mode.
* The STATUS stage then becomes the
* "alt_next" to the DATA stage.
*/
xfer->flags_int.short_frames_ok = 1;
}
}
}
/*
* Check if BUS-DMA support is enabled and try to load virtual
* buffers into DMA, if any:
*/
#if USB_HAVE_BUSDMA
if (xfer->flags_int.bdma_enable) {
/* insert the USB transfer last in the BUS-DMA queue */
usb_command_wrapper(&xfer->xroot->dma_q, xfer);
return;
}
#endif
/*
* Enter the USB transfer into the Host Controller or
* Device Controller schedule:
*/
usbd_pipe_enter(xfer);
}
/*------------------------------------------------------------------------*
* usbd_pipe_enter - factored out code
*------------------------------------------------------------------------*/
void
usbd_pipe_enter(struct usb_xfer *xfer)
{
struct usb_endpoint *ep;
USB_XFER_LOCK_ASSERT(xfer, MA_OWNED);
USB_BUS_LOCK(xfer->xroot->bus);
ep = xfer->endpoint;
DPRINTF("enter\n");
/* the transfer can now be cancelled */
xfer->flags_int.can_cancel_immed = 1;
/* enter the transfer */
(ep->methods->enter) (xfer);
/* check for transfer error */
if (xfer->error) {
/* some error has happened */
usbd_transfer_done(xfer, 0);
USB_BUS_UNLOCK(xfer->xroot->bus);
return;
}
/* start the transfer */
usb_command_wrapper(&ep->endpoint_q[xfer->stream_id], xfer);
USB_BUS_UNLOCK(xfer->xroot->bus);
}
/*------------------------------------------------------------------------*
* usbd_transfer_start - start an USB transfer
*
* NOTE: Calling this function more than one time will only
* result in a single transfer start, until the USB transfer
* completes.
*------------------------------------------------------------------------*/
void
usbd_transfer_start(struct usb_xfer *xfer)
{
if (xfer == NULL) {
/* transfer is gone */
return;
}
USB_XFER_LOCK_ASSERT(xfer, MA_OWNED);
/* mark the USB transfer started */
if (!xfer->flags_int.started) {
/* lock the BUS lock to avoid races updating flags_int */
USB_BUS_LOCK(xfer->xroot->bus);
xfer->flags_int.started = 1;
USB_BUS_UNLOCK(xfer->xroot->bus);
}
/* check if the USB transfer callback is already transferring */
if (xfer->flags_int.transferring) {
return;
}
USB_BUS_LOCK(xfer->xroot->bus);
/* call the USB transfer callback */
usbd_callback_ss_done_defer(xfer);
USB_BUS_UNLOCK(xfer->xroot->bus);
}
/*------------------------------------------------------------------------*
* usbd_transfer_stop - stop an USB transfer
*
* NOTE: Calling this function more than one time will only
* result in a single transfer stop.
* NOTE: When this function returns it is not safe to free nor
* reuse any DMA buffers. See "usbd_transfer_drain()".
*------------------------------------------------------------------------*/
void
usbd_transfer_stop(struct usb_xfer *xfer)
{
struct usb_endpoint *ep;
if (xfer == NULL) {
/* transfer is gone */
return;
}
USB_XFER_LOCK_ASSERT(xfer, MA_OWNED);
/* check if the USB transfer was ever opened */
if (!xfer->flags_int.open) {
if (xfer->flags_int.started) {
/* nothing to do except clearing the "started" flag */
/* lock the BUS lock to avoid races updating flags_int */
USB_BUS_LOCK(xfer->xroot->bus);
xfer->flags_int.started = 0;
USB_BUS_UNLOCK(xfer->xroot->bus);
}
return;
}
/* try to stop the current USB transfer */
USB_BUS_LOCK(xfer->xroot->bus);
/* override any previous error */
xfer->error = USB_ERR_CANCELLED;
/*
* Clear "open" and "started" when both private and USB lock
* is locked so that we don't get a race updating "flags_int"
*/
xfer->flags_int.open = 0;
xfer->flags_int.started = 0;
/*
* Check if we can cancel the USB transfer immediately.
*/
if (xfer->flags_int.transferring) {
if (xfer->flags_int.can_cancel_immed &&
(!xfer->flags_int.did_close)) {
DPRINTF("close\n");
/*
* The following will lead to an USB_ERR_CANCELLED
* error code being passed to the USB callback.
*/
(xfer->endpoint->methods->close) (xfer);
/* only close once */
xfer->flags_int.did_close = 1;
} else {
/* need to wait for the next done callback */
}
} else {
DPRINTF("close\n");
/* close here and now */
(xfer->endpoint->methods->close) (xfer);
/*
* Any additional DMA delay is done by
* "usbd_transfer_unsetup()".
*/
/*
* Special case. Check if we need to restart a blocked
* endpoint.
*/
ep = xfer->endpoint;
/*
* If the current USB transfer is completing we need
* to start the next one:
*/
if (ep->endpoint_q[xfer->stream_id].curr == xfer) {
usb_command_wrapper(
&ep->endpoint_q[xfer->stream_id], NULL);
}
}
USB_BUS_UNLOCK(xfer->xroot->bus);
}
/*------------------------------------------------------------------------*
* usbd_transfer_pending
*
* This function will check if an USB transfer is pending which is a
* little bit complicated!
* Return values:
* 0: Not pending
* 1: Pending: The USB transfer will receive a callback in the future.
*------------------------------------------------------------------------*/
uint8_t
usbd_transfer_pending(struct usb_xfer *xfer)
{
struct usb_xfer_root *info;
struct usb_xfer_queue *pq;
if (xfer == NULL) {
/* transfer is gone */
return (0);
}
USB_XFER_LOCK_ASSERT(xfer, MA_OWNED);
if (xfer->flags_int.transferring) {
/* trivial case */
return (1);
}
USB_BUS_LOCK(xfer->xroot->bus);
if (xfer->wait_queue) {
/* we are waiting on a queue somewhere */
USB_BUS_UNLOCK(xfer->xroot->bus);
return (1);
}
info = xfer->xroot;
pq = &info->done_q;
if (pq->curr == xfer) {
/* we are currently scheduled for callback */
USB_BUS_UNLOCK(xfer->xroot->bus);
return (1);
}
/* we are not pending */
USB_BUS_UNLOCK(xfer->xroot->bus);
return (0);
}
/*------------------------------------------------------------------------*
* usbd_transfer_drain
*
* This function will stop the USB transfer and wait for any
* additional BUS-DMA and HW-DMA operations to complete. Buffers that
* are loaded into DMA can safely be freed or reused after that this
* function has returned.
*------------------------------------------------------------------------*/
void
usbd_transfer_drain(struct usb_xfer *xfer)
{
WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL,
"usbd_transfer_drain can sleep!");
if (xfer == NULL) {
/* transfer is gone */
return;
}
if (xfer->xroot->xfer_mtx != &Giant) {
USB_XFER_LOCK_ASSERT(xfer, MA_NOTOWNED);
}
USB_XFER_LOCK(xfer);
usbd_transfer_stop(xfer);
while (usbd_transfer_pending(xfer) ||
xfer->flags_int.doing_callback) {
/*
* It is allowed that the callback can drop its
* transfer mutex. In that case checking only
* "usbd_transfer_pending()" is not enough to tell if
* the USB transfer is fully drained. We also need to
* check the internal "doing_callback" flag.
*/
xfer->flags_int.draining = 1;
/*
* Wait until the current outstanding USB
* transfer is complete !
*/
cv_wait(&xfer->xroot->cv_drain, xfer->xroot->xfer_mtx);
}
USB_XFER_UNLOCK(xfer);
}
struct usb_page_cache *
usbd_xfer_get_frame(struct usb_xfer *xfer, usb_frcount_t frindex)
{
KASSERT(frindex < xfer->max_frame_count, ("frame index overflow"));
return (&xfer->frbuffers[frindex]);
}
void *
usbd_xfer_get_frame_buffer(struct usb_xfer *xfer, usb_frcount_t frindex)
{
struct usb_page_search page_info;
KASSERT(frindex < xfer->max_frame_count, ("frame index overflow"));
usbd_get_page(&xfer->frbuffers[frindex], 0, &page_info);
return (page_info.buffer);
}
/*------------------------------------------------------------------------*
* usbd_xfer_get_fps_shift
*
* The following function is only useful for isochronous transfers. It
* returns how many times the frame execution rate has been shifted
* down.
*
* Return value:
* Success: 0..3
* Failure: 0
*------------------------------------------------------------------------*/
uint8_t
usbd_xfer_get_fps_shift(struct usb_xfer *xfer)
{
return (xfer->fps_shift);
}
usb_frlength_t
usbd_xfer_frame_len(struct usb_xfer *xfer, usb_frcount_t frindex)
{
KASSERT(frindex < xfer->max_frame_count, ("frame index overflow"));
return (xfer->frlengths[frindex]);
}
/*------------------------------------------------------------------------*
* usbd_xfer_set_frame_data
*
* This function sets the pointer of the buffer that should
* loaded directly into DMA for the given USB frame. Passing "ptr"
* equal to NULL while the corresponding "frlength" is greater
* than zero gives undefined results!
*------------------------------------------------------------------------*/
void
usbd_xfer_set_frame_data(struct usb_xfer *xfer, usb_frcount_t frindex,
void *ptr, usb_frlength_t len)
{
KASSERT(frindex < xfer->max_frame_count, ("frame index overflow"));
/* set virtual address to load and length */
xfer->frbuffers[frindex].buffer = ptr;
usbd_xfer_set_frame_len(xfer, frindex, len);
}
void
usbd_xfer_frame_data(struct usb_xfer *xfer, usb_frcount_t frindex,
void **ptr, int *len)
{
KASSERT(frindex < xfer->max_frame_count, ("frame index overflow"));
if (ptr != NULL)
*ptr = xfer->frbuffers[frindex].buffer;
if (len != NULL)
*len = xfer->frlengths[frindex];
}
/*------------------------------------------------------------------------*
* usbd_xfer_old_frame_length
*
* This function returns the framelength of the given frame at the
* time the transfer was submitted. This function can be used to
* compute the starting data pointer of the next isochronous frame
* when an isochronous transfer has completed.
*------------------------------------------------------------------------*/
usb_frlength_t
usbd_xfer_old_frame_length(struct usb_xfer *xfer, usb_frcount_t frindex)
{
KASSERT(frindex < xfer->max_frame_count, ("frame index overflow"));
return (xfer->frlengths[frindex + xfer->max_frame_count]);
}
void
usbd_xfer_status(struct usb_xfer *xfer, int *actlen, int *sumlen, int *aframes,
int *nframes)
{
if (actlen != NULL)
*actlen = xfer->actlen;
if (sumlen != NULL)
*sumlen = xfer->sumlen;
if (aframes != NULL)
*aframes = xfer->aframes;
if (nframes != NULL)
*nframes = xfer->nframes;
}
/*------------------------------------------------------------------------*
* usbd_xfer_set_frame_offset
*
* This function sets the frame data buffer offset relative to the beginning
* of the USB DMA buffer allocated for this USB transfer.
*------------------------------------------------------------------------*/
void
usbd_xfer_set_frame_offset(struct usb_xfer *xfer, usb_frlength_t offset,
usb_frcount_t frindex)
{
KASSERT(!xfer->flags.ext_buffer, ("Cannot offset data frame "
"when the USB buffer is external\n"));
KASSERT(frindex < xfer->max_frame_count, ("frame index overflow"));
/* set virtual address to load */
xfer->frbuffers[frindex].buffer =
USB_ADD_BYTES(xfer->local_buffer, offset);
}
void
usbd_xfer_set_interval(struct usb_xfer *xfer, int i)
{
xfer->interval = i;
}
void
usbd_xfer_set_timeout(struct usb_xfer *xfer, int t)
{
xfer->timeout = t;
}
void
usbd_xfer_set_frames(struct usb_xfer *xfer, usb_frcount_t n)
{
xfer->nframes = n;
}
usb_frcount_t
usbd_xfer_max_frames(struct usb_xfer *xfer)
{
return (xfer->max_frame_count);
}
usb_frlength_t
usbd_xfer_max_len(struct usb_xfer *xfer)
{
return (xfer->max_data_length);
}
usb_frlength_t
usbd_xfer_max_framelen(struct usb_xfer *xfer)
{
return (xfer->max_frame_size);
}
void
usbd_xfer_set_frame_len(struct usb_xfer *xfer, usb_frcount_t frindex,
usb_frlength_t len)
{
KASSERT(frindex < xfer->max_frame_count, ("frame index overflow"));
xfer->frlengths[frindex] = len;
}
/*------------------------------------------------------------------------*
* usb_callback_proc - factored out code
*
* This function performs USB callbacks.
*------------------------------------------------------------------------*/
static void
usb_callback_proc(struct usb_proc_msg *_pm)
{
struct usb_done_msg *pm = (void *)_pm;
struct usb_xfer_root *info = pm->xroot;
/* Change locking order */
USB_BUS_UNLOCK(info->bus);
/*
* We exploit the fact that the mutex is the same for all
* callbacks that will be called from this thread:
*/
mtx_lock(info->xfer_mtx);
USB_BUS_LOCK(info->bus);
/* Continue where we lost track */
usb_command_wrapper(&info->done_q,
info->done_q.curr);
mtx_unlock(info->xfer_mtx);
}
/*------------------------------------------------------------------------*
* usbd_callback_ss_done_defer
*
* This function will defer the start, stop and done callback to the
* correct thread.
*------------------------------------------------------------------------*/
static void
usbd_callback_ss_done_defer(struct usb_xfer *xfer)
{
struct usb_xfer_root *info = xfer->xroot;
struct usb_xfer_queue *pq = &info->done_q;
USB_BUS_LOCK_ASSERT(xfer->xroot->bus, MA_OWNED);
if (pq->curr != xfer) {
usbd_transfer_enqueue(pq, xfer);
}
if (!pq->recurse_1) {
/*
* We have to postpone the callback due to the fact we
* will have a Lock Order Reversal, LOR, if we try to
* proceed !
*/
if (usb_proc_msignal(info->done_p,
&info->done_m[0], &info->done_m[1])) {
/* ignore */
}
} else {
/* clear second recurse flag */
pq->recurse_2 = 0;
}
return;
}
/*------------------------------------------------------------------------*
* usbd_callback_wrapper
*
* This is a wrapper for USB callbacks. This wrapper does some
* auto-magic things like figuring out if we can call the callback
* directly from the current context or if we need to wakeup the
* interrupt process.
*------------------------------------------------------------------------*/
static void
usbd_callback_wrapper(struct usb_xfer_queue *pq)
{
struct usb_xfer *xfer = pq->curr;
struct usb_xfer_root *info = xfer->xroot;
USB_BUS_LOCK_ASSERT(info->bus, MA_OWNED);
if (!mtx_owned(info->xfer_mtx) && !SCHEDULER_STOPPED()) {
/*
* Cases that end up here:
*
* 5) HW interrupt done callback or other source.
*/
DPRINTFN(3, "case 5\n");
/*
* We have to postpone the callback due to the fact we
* will have a Lock Order Reversal, LOR, if we try to
* proceed !
*/
if (usb_proc_msignal(info->done_p,
&info->done_m[0], &info->done_m[1])) {
/* ignore */
}
return;
}
/*
* Cases that end up here:
*
* 1) We are starting a transfer
* 2) We are prematurely calling back a transfer
* 3) We are stopping a transfer
* 4) We are doing an ordinary callback
*/
DPRINTFN(3, "case 1-4\n");
/* get next USB transfer in the queue */
info->done_q.curr = NULL;
/* set flag in case of drain */
xfer->flags_int.doing_callback = 1;
USB_BUS_UNLOCK(info->bus);
USB_BUS_LOCK_ASSERT(info->bus, MA_NOTOWNED);
/* set correct USB state for callback */
if (!xfer->flags_int.transferring) {
xfer->usb_state = USB_ST_SETUP;
if (!xfer->flags_int.started) {
/* we got stopped before we even got started */
USB_BUS_LOCK(info->bus);
goto done;
}
} else {
if (usbd_callback_wrapper_sub(xfer)) {
/* the callback has been deferred */
USB_BUS_LOCK(info->bus);
goto done;
}
#if USB_HAVE_POWERD
/* decrement power reference */
usbd_transfer_power_ref(xfer, -1);
#endif
xfer->flags_int.transferring = 0;
if (xfer->error) {
xfer->usb_state = USB_ST_ERROR;
} else {
/* set transferred state */
xfer->usb_state = USB_ST_TRANSFERRED;
#if USB_HAVE_BUSDMA
/* sync DMA memory, if any */
if (xfer->flags_int.bdma_enable &&
(!xfer->flags_int.bdma_no_post_sync)) {
usb_bdma_post_sync(xfer);
}
#endif
}
}
#if USB_HAVE_PF
if (xfer->usb_state != USB_ST_SETUP)
usbpf_xfertap(xfer, USBPF_XFERTAP_DONE);
#endif
/* call processing routine */
(xfer->callback) (xfer, xfer->error);
/* pickup the USB mutex again */
USB_BUS_LOCK(info->bus);
/*
* Check if we got started after that we got cancelled, but
* before we managed to do the callback.
*/
if ((!xfer->flags_int.open) &&
(xfer->flags_int.started) &&
(xfer->usb_state == USB_ST_ERROR)) {
/* clear flag in case of drain */
xfer->flags_int.doing_callback = 0;
/* try to loop, but not recursivly */
usb_command_wrapper(&info->done_q, xfer);
return;
}
done:
/* clear flag in case of drain */
xfer->flags_int.doing_callback = 0;
/*
* Check if we are draining.
*/
if (xfer->flags_int.draining &&
(!xfer->flags_int.transferring)) {
/* "usbd_transfer_drain()" is waiting for end of transfer */
xfer->flags_int.draining = 0;
cv_broadcast(&info->cv_drain);
}
/* do the next callback, if any */
usb_command_wrapper(&info->done_q,
info->done_q.curr);
}
/*------------------------------------------------------------------------*
* usb_dma_delay_done_cb
*
* This function is called when the DMA delay has been exectuded, and
* will make sure that the callback is called to complete the USB
* transfer. This code path is ususally only used when there is an USB
* error like USB_ERR_CANCELLED.
*------------------------------------------------------------------------*/
void
usb_dma_delay_done_cb(struct usb_xfer *xfer)
{
USB_BUS_LOCK_ASSERT(xfer->xroot->bus, MA_OWNED);
DPRINTFN(3, "Completed %p\n", xfer);
/* queue callback for execution, again */
usbd_transfer_done(xfer, 0);
}
/*------------------------------------------------------------------------*
* usbd_transfer_dequeue
*
* - This function is used to remove an USB transfer from a USB
* transfer queue.
*
* - This function can be called multiple times in a row.
*------------------------------------------------------------------------*/
void
usbd_transfer_dequeue(struct usb_xfer *xfer)
{
struct usb_xfer_queue *pq;
pq = xfer->wait_queue;
if (pq) {
TAILQ_REMOVE(&pq->head, xfer, wait_entry);
xfer->wait_queue = NULL;
}
}
/*------------------------------------------------------------------------*
* usbd_transfer_enqueue
*
* - This function is used to insert an USB transfer into a USB *
* transfer queue.
*
* - This function can be called multiple times in a row.
*------------------------------------------------------------------------*/
void
usbd_transfer_enqueue(struct usb_xfer_queue *pq, struct usb_xfer *xfer)
{
/*
* Insert the USB transfer into the queue, if it is not
* already on a USB transfer queue:
*/
if (xfer->wait_queue == NULL) {
xfer->wait_queue = pq;
TAILQ_INSERT_TAIL(&pq->head, xfer, wait_entry);
}
}
/*------------------------------------------------------------------------*
* usbd_transfer_done
*
* - This function is used to remove an USB transfer from the busdma,
* pipe or interrupt queue.
*
* - This function is used to queue the USB transfer on the done
* queue.
*
* - This function is used to stop any USB transfer timeouts.
*------------------------------------------------------------------------*/
void
usbd_transfer_done(struct usb_xfer *xfer, usb_error_t error)
{
struct usb_xfer_root *info = xfer->xroot;
USB_BUS_LOCK_ASSERT(info->bus, MA_OWNED);
DPRINTF("err=%s\n", usbd_errstr(error));
/*
* If we are not transferring then just return.
* This can happen during transfer cancel.
*/
if (!xfer->flags_int.transferring) {
DPRINTF("not transferring\n");
/* end of control transfer, if any */
xfer->flags_int.control_act = 0;
return;
}
/* only set transfer error, if not already set */
if (xfer->error == USB_ERR_NORMAL_COMPLETION)
xfer->error = error;
/* stop any callouts */
usb_callout_stop(&xfer->timeout_handle);
/*
* If we are waiting on a queue, just remove the USB transfer
* from the queue, if any. We should have the required locks
* locked to do the remove when this function is called.
*/
usbd_transfer_dequeue(xfer);
#if USB_HAVE_BUSDMA
if (mtx_owned(info->xfer_mtx)) {
struct usb_xfer_queue *pq;
/*
* If the private USB lock is not locked, then we assume
* that the BUS-DMA load stage has been passed:
*/
pq = &info->dma_q;
if (pq->curr == xfer) {
/* start the next BUS-DMA load, if any */
usb_command_wrapper(pq, NULL);
}
}
#endif
/* keep some statistics */
if (xfer->error) {
info->bus->stats_err.uds_requests
[xfer->endpoint->edesc->bmAttributes & UE_XFERTYPE]++;
} else {
info->bus->stats_ok.uds_requests
[xfer->endpoint->edesc->bmAttributes & UE_XFERTYPE]++;
}
/* call the USB transfer callback */
usbd_callback_ss_done_defer(xfer);
}
/*------------------------------------------------------------------------*
* usbd_transfer_start_cb
*
* This function is called to start the USB transfer when
* "xfer->interval" is greater than zero, and and the endpoint type is
* BULK or CONTROL.
*------------------------------------------------------------------------*/
static void
usbd_transfer_start_cb(void *arg)
{
struct usb_xfer *xfer = arg;
struct usb_endpoint *ep = xfer->endpoint;
USB_BUS_LOCK_ASSERT(xfer->xroot->bus, MA_OWNED);
DPRINTF("start\n");
#if USB_HAVE_PF
usbpf_xfertap(xfer, USBPF_XFERTAP_SUBMIT);
#endif
/* the transfer can now be cancelled */
xfer->flags_int.can_cancel_immed = 1;
/* start USB transfer, if no error */
if (xfer->error == 0)
(ep->methods->start) (xfer);
/* check for transfer error */
if (xfer->error) {
/* some error has happened */
usbd_transfer_done(xfer, 0);
}
}
/*------------------------------------------------------------------------*
* usbd_xfer_set_stall
*
* This function is used to set the stall flag outside the
* callback. This function is NULL safe.
*------------------------------------------------------------------------*/
void
usbd_xfer_set_stall(struct usb_xfer *xfer)
{
if (xfer == NULL) {
/* tearing down */
return;
}
USB_XFER_LOCK_ASSERT(xfer, MA_OWNED);
/* avoid any races by locking the USB mutex */
USB_BUS_LOCK(xfer->xroot->bus);
xfer->flags.stall_pipe = 1;
USB_BUS_UNLOCK(xfer->xroot->bus);
}
int
usbd_xfer_is_stalled(struct usb_xfer *xfer)
{
return (xfer->endpoint->is_stalled);
}
/*------------------------------------------------------------------------*
* usbd_transfer_clear_stall
*
* This function is used to clear the stall flag outside the
* callback. This function is NULL safe.
*------------------------------------------------------------------------*/
void
usbd_transfer_clear_stall(struct usb_xfer *xfer)
{
if (xfer == NULL) {
/* tearing down */
return;
}
USB_XFER_LOCK_ASSERT(xfer, MA_OWNED);
/* avoid any races by locking the USB mutex */
USB_BUS_LOCK(xfer->xroot->bus);
xfer->flags.stall_pipe = 0;
USB_BUS_UNLOCK(xfer->xroot->bus);
}
/*------------------------------------------------------------------------*
* usbd_pipe_start
*
* This function is used to add an USB transfer to the pipe transfer list.
*------------------------------------------------------------------------*/
void
usbd_pipe_start(struct usb_xfer_queue *pq)
{
struct usb_endpoint *ep;
struct usb_xfer *xfer;
uint8_t type;
xfer = pq->curr;
ep = xfer->endpoint;
USB_BUS_LOCK_ASSERT(xfer->xroot->bus, MA_OWNED);
/*
* If the endpoint is already stalled we do nothing !
*/
if (ep->is_stalled) {
return;
}
/*
* Check if we are supposed to stall the endpoint:
*/
if (xfer->flags.stall_pipe) {
struct usb_device *udev;
struct usb_xfer_root *info;
/* clear stall command */
xfer->flags.stall_pipe = 0;
/* get pointer to USB device */
info = xfer->xroot;
udev = info->udev;
/*
* Only stall BULK and INTERRUPT endpoints.
*/
type = (ep->edesc->bmAttributes & UE_XFERTYPE);
if ((type == UE_BULK) ||
(type == UE_INTERRUPT)) {
uint8_t did_stall;
did_stall = 1;
if (udev->flags.usb_mode == USB_MODE_DEVICE) {
(udev->bus->methods->set_stall) (
udev, ep, &did_stall);
} else if (udev->ctrl_xfer[1]) {
info = udev->ctrl_xfer[1]->xroot;
usb_proc_msignal(
USB_BUS_NON_GIANT_PROC(info->bus),
&udev->cs_msg[0], &udev->cs_msg[1]);
} else {
/* should not happen */
DPRINTFN(0, "No stall handler\n");
}
/*
* Check if we should stall. Some USB hardware
* handles set- and clear-stall in hardware.
*/
if (did_stall) {
/*
* The transfer will be continued when
* the clear-stall control endpoint
* message is received.
*/
ep->is_stalled = 1;
return;
}
} else if (type == UE_ISOCHRONOUS) {
/*
* Make sure any FIFO overflow or other FIFO
* error conditions go away by resetting the
* endpoint FIFO through the clear stall
* method.
*/
if (udev->flags.usb_mode == USB_MODE_DEVICE) {
(udev->bus->methods->clear_stall) (udev, ep);
}
}
}
/* Set or clear stall complete - special case */
if (xfer->nframes == 0) {
/* we are complete */
xfer->aframes = 0;
usbd_transfer_done(xfer, 0);
return;
}
/*
* Handled cases:
*
* 1) Start the first transfer queued.
*
* 2) Re-start the current USB transfer.
*/
/*
* Check if there should be any
* pre transfer start delay:
*/
if (xfer->interval > 0) {
type = (ep->edesc->bmAttributes & UE_XFERTYPE);
if ((type == UE_BULK) ||
(type == UE_CONTROL)) {
usbd_transfer_timeout_ms(xfer,
&usbd_transfer_start_cb,
xfer->interval);
return;
}
}
DPRINTF("start\n");
#if USB_HAVE_PF
usbpf_xfertap(xfer, USBPF_XFERTAP_SUBMIT);
#endif
/* the transfer can now be cancelled */
xfer->flags_int.can_cancel_immed = 1;
/* start USB transfer, if no error */
if (xfer->error == 0)
(ep->methods->start) (xfer);
/* check for transfer error */
if (xfer->error) {
/* some error has happened */
usbd_transfer_done(xfer, 0);
}
}
/*------------------------------------------------------------------------*
* usbd_transfer_timeout_ms
*
* This function is used to setup a timeout on the given USB
* transfer. If the timeout has been deferred the callback given by
* "cb" will get called after "ms" milliseconds.
*------------------------------------------------------------------------*/
void
usbd_transfer_timeout_ms(struct usb_xfer *xfer,
void (*cb) (void *arg), usb_timeout_t ms)
{
USB_BUS_LOCK_ASSERT(xfer->xroot->bus, MA_OWNED);
/* defer delay */
usb_callout_reset(&xfer->timeout_handle,
USB_MS_TO_TICKS(ms) + USB_CALLOUT_ZERO_TICKS, cb, xfer);
}
/*------------------------------------------------------------------------*
* usbd_callback_wrapper_sub
*
* - This function will update variables in an USB transfer after
* that the USB transfer is complete.
*
* - This function is used to start the next USB transfer on the
* ep transfer queue, if any.
*
* NOTE: In some special cases the USB transfer will not be removed from
* the pipe queue, but remain first. To enforce USB transfer removal call
* this function passing the error code "USB_ERR_CANCELLED".
*
* Return values:
* 0: Success.
* Else: The callback has been deferred.
*------------------------------------------------------------------------*/
static uint8_t
usbd_callback_wrapper_sub(struct usb_xfer *xfer)
{
struct usb_endpoint *ep;
struct usb_bus *bus;
usb_frcount_t x;
bus = xfer->xroot->bus;
if ((!xfer->flags_int.open) &&
(!xfer->flags_int.did_close)) {
DPRINTF("close\n");
USB_BUS_LOCK(bus);
(xfer->endpoint->methods->close) (xfer);
USB_BUS_UNLOCK(bus);
/* only close once */
xfer->flags_int.did_close = 1;
return (1); /* wait for new callback */
}
/*
* If we have a non-hardware induced error we
* need to do the DMA delay!
*/
if (xfer->error != 0 && !xfer->flags_int.did_dma_delay &&
(xfer->error == USB_ERR_CANCELLED ||
xfer->error == USB_ERR_TIMEOUT ||
bus->methods->start_dma_delay != NULL)) {
usb_timeout_t temp;
/* only delay once */
xfer->flags_int.did_dma_delay = 1;
/* we can not cancel this delay */
xfer->flags_int.can_cancel_immed = 0;
temp = usbd_get_dma_delay(xfer->xroot->udev);
DPRINTFN(3, "DMA delay, %u ms, "
"on %p\n", temp, xfer);
if (temp != 0) {
USB_BUS_LOCK(bus);
/*
* Some hardware solutions have dedicated
* events when it is safe to free DMA'ed
* memory. For the other hardware platforms we
* use a static delay.
*/
if (bus->methods->start_dma_delay != NULL) {
(bus->methods->start_dma_delay) (xfer);
} else {
usbd_transfer_timeout_ms(xfer,
(void (*)(void *))&usb_dma_delay_done_cb,
temp);
}
USB_BUS_UNLOCK(bus);
return (1); /* wait for new callback */
}
}
/* check actual number of frames */
if (xfer->aframes > xfer->nframes) {
if (xfer->error == 0) {
panic("%s: actual number of frames, %d, is "
"greater than initial number of frames, %d\n",
__FUNCTION__, xfer->aframes, xfer->nframes);
} else {
/* just set some valid value */
xfer->aframes = xfer->nframes;
}
}
/* compute actual length */
xfer->actlen = 0;
for (x = 0; x != xfer->aframes; x++) {
xfer->actlen += xfer->frlengths[x];
}
/*
* Frames that were not transferred get zero actual length in
* case the USB device driver does not check the actual number
* of frames transferred, "xfer->aframes":
*/
for (; x < xfer->nframes; x++) {
usbd_xfer_set_frame_len(xfer, x, 0);
}
/* check actual length */
if (xfer->actlen > xfer->sumlen) {
if (xfer->error == 0) {
panic("%s: actual length, %d, is greater than "
"initial length, %d\n",
__FUNCTION__, xfer->actlen, xfer->sumlen);
} else {
/* just set some valid value */
xfer->actlen = xfer->sumlen;
}
}
DPRINTFN(1, "xfer=%p endpoint=%p sts=%d alen=%d, slen=%d, afrm=%d, nfrm=%d\n",
xfer, xfer->endpoint, xfer->error, xfer->actlen, xfer->sumlen,
xfer->aframes, xfer->nframes);
if (xfer->error) {
/* end of control transfer, if any */
xfer->flags_int.control_act = 0;
#if USB_HAVE_TT_SUPPORT
switch (xfer->error) {
case USB_ERR_NORMAL_COMPLETION:
case USB_ERR_SHORT_XFER:
case USB_ERR_STALLED:
case USB_ERR_CANCELLED:
/* nothing to do */
break;
default:
/* try to reset the TT, if any */
USB_BUS_LOCK(bus);
uhub_tt_buffer_reset_async_locked(xfer->xroot->udev, xfer->endpoint);
USB_BUS_UNLOCK(bus);
break;
}
#endif
/* check if we should block the execution queue */
if ((xfer->error != USB_ERR_CANCELLED) &&
(xfer->flags.pipe_bof)) {
DPRINTFN(2, "xfer=%p: Block On Failure "
"on endpoint=%p\n", xfer, xfer->endpoint);
goto done;
}
} else {
/* check for short transfers */
if (xfer->actlen < xfer->sumlen) {
/* end of control transfer, if any */
xfer->flags_int.control_act = 0;
if (!xfer->flags_int.short_xfer_ok) {
xfer->error = USB_ERR_SHORT_XFER;
if (xfer->flags.pipe_bof) {
DPRINTFN(2, "xfer=%p: Block On Failure on "
"Short Transfer on endpoint %p.\n",
xfer, xfer->endpoint);
goto done;
}
}
} else {
/*
* Check if we are in the middle of a
* control transfer:
*/
if (xfer->flags_int.control_act) {
DPRINTFN(5, "xfer=%p: Control transfer "
"active on endpoint=%p\n", xfer, xfer->endpoint);
goto done;
}
}
}
ep = xfer->endpoint;
/*
* If the current USB transfer is completing we need to start the
* next one:
*/
USB_BUS_LOCK(bus);
if (ep->endpoint_q[xfer->stream_id].curr == xfer) {
usb_command_wrapper(&ep->endpoint_q[xfer->stream_id], NULL);
if (ep->endpoint_q[xfer->stream_id].curr != NULL ||
TAILQ_FIRST(&ep->endpoint_q[xfer->stream_id].head) != NULL) {
/* there is another USB transfer waiting */
} else {
/* this is the last USB transfer */
/* clear isochronous sync flag */
xfer->endpoint->is_synced = 0;
}
}
USB_BUS_UNLOCK(bus);
done:
return (0);
}
/*------------------------------------------------------------------------*
* usb_command_wrapper
*
* This function is used to execute commands non-recursivly on an USB
* transfer.
*------------------------------------------------------------------------*/
void
usb_command_wrapper(struct usb_xfer_queue *pq, struct usb_xfer *xfer)
{
if (xfer) {
/*
* If the transfer is not already processing,
* queue it!
*/
if (pq->curr != xfer) {
usbd_transfer_enqueue(pq, xfer);
if (pq->curr != NULL) {
/* something is already processing */
DPRINTFN(6, "busy %p\n", pq->curr);
return;
}
}
} else {
/* Get next element in queue */
pq->curr = NULL;
}
if (!pq->recurse_1) {
do {
/* set both recurse flags */
pq->recurse_1 = 1;
pq->recurse_2 = 1;
if (pq->curr == NULL) {
xfer = TAILQ_FIRST(&pq->head);
if (xfer) {
TAILQ_REMOVE(&pq->head, xfer,
wait_entry);
xfer->wait_queue = NULL;
pq->curr = xfer;
} else {
break;
}
}
DPRINTFN(6, "cb %p (enter)\n", pq->curr);
(pq->command) (pq);
DPRINTFN(6, "cb %p (leave)\n", pq->curr);
} while (!pq->recurse_2);
/* clear first recurse flag */
pq->recurse_1 = 0;
} else {
/* clear second recurse flag */
pq->recurse_2 = 0;
}
}
/*------------------------------------------------------------------------*
* usbd_ctrl_transfer_setup
*
* This function is used to setup the default USB control endpoint
* transfer.
*------------------------------------------------------------------------*/
void
usbd_ctrl_transfer_setup(struct usb_device *udev)
{
struct usb_xfer *xfer;
uint8_t no_resetup;
uint8_t iface_index;
/* check for root HUB */
if (udev->parent_hub == NULL)
return;
repeat:
xfer = udev->ctrl_xfer[0];
if (xfer) {
USB_XFER_LOCK(xfer);
no_resetup =
((xfer->address == udev->address) &&
(udev->ctrl_ep_desc.wMaxPacketSize[0] ==
udev->ddesc.bMaxPacketSize));
if (udev->flags.usb_mode == USB_MODE_DEVICE) {
if (no_resetup) {
/*
* NOTE: checking "xfer->address" and
* starting the USB transfer must be
* atomic!
*/
usbd_transfer_start(xfer);
}
}
USB_XFER_UNLOCK(xfer);
} else {
no_resetup = 0;
}
if (no_resetup) {
/*
* All parameters are exactly the same like before.
* Just return.
*/
return;
}
/*
* Update wMaxPacketSize for the default control endpoint:
*/
udev->ctrl_ep_desc.wMaxPacketSize[0] =
udev->ddesc.bMaxPacketSize;
/*
* Unsetup any existing USB transfer:
*/
usbd_transfer_unsetup(udev->ctrl_xfer, USB_CTRL_XFER_MAX);
/*
* Reset clear stall error counter.
*/
udev->clear_stall_errors = 0;
/*
* Try to setup a new USB transfer for the
* default control endpoint:
*/
iface_index = 0;
if (usbd_transfer_setup(udev, &iface_index,
udev->ctrl_xfer, usb_control_ep_cfg, USB_CTRL_XFER_MAX, NULL,
&udev->device_mtx)) {
DPRINTFN(0, "could not setup default "
"USB transfer\n");
} else {
goto repeat;
}
}
/*------------------------------------------------------------------------*
* usbd_clear_data_toggle - factored out code
*
* NOTE: the intention of this function is not to reset the hardware
* data toggle.
*------------------------------------------------------------------------*/
void
usbd_clear_stall_locked(struct usb_device *udev, struct usb_endpoint *ep)
{
USB_BUS_LOCK_ASSERT(udev->bus, MA_OWNED);
/* check that we have a valid case */
if (udev->flags.usb_mode == USB_MODE_HOST &&
udev->parent_hub != NULL &&
udev->bus->methods->clear_stall != NULL &&
ep->methods != NULL) {
(udev->bus->methods->clear_stall) (udev, ep);
}
}
/*------------------------------------------------------------------------*
* usbd_clear_data_toggle - factored out code
*
* NOTE: the intention of this function is not to reset the hardware
* data toggle on the USB device side.
*------------------------------------------------------------------------*/
void
usbd_clear_data_toggle(struct usb_device *udev, struct usb_endpoint *ep)
{
DPRINTFN(5, "udev=%p endpoint=%p\n", udev, ep);
USB_BUS_LOCK(udev->bus);
ep->toggle_next = 0;
/* some hardware needs a callback to clear the data toggle */
usbd_clear_stall_locked(udev, ep);
USB_BUS_UNLOCK(udev->bus);
}
/*------------------------------------------------------------------------*
* usbd_clear_stall_callback - factored out clear stall callback
*
* Input parameters:
* xfer1: Clear Stall Control Transfer
* xfer2: Stalled USB Transfer
*
* This function is NULL safe.
*
* Return values:
* 0: In progress
* Else: Finished
*
* Clear stall config example:
*
* static const struct usb_config my_clearstall = {
* .type = UE_CONTROL,
* .endpoint = 0,
* .direction = UE_DIR_ANY,
* .interval = 50, //50 milliseconds
* .bufsize = sizeof(struct usb_device_request),
* .timeout = 1000, //1.000 seconds
* .callback = &my_clear_stall_callback, // **
* .usb_mode = USB_MODE_HOST,
* };
*
* ** "my_clear_stall_callback" calls "usbd_clear_stall_callback"
* passing the correct parameters.
*------------------------------------------------------------------------*/
uint8_t
usbd_clear_stall_callback(struct usb_xfer *xfer1,
struct usb_xfer *xfer2)
{
struct usb_device_request req;
if (xfer2 == NULL) {
/* looks like we are tearing down */
DPRINTF("NULL input parameter\n");
return (0);
}
USB_XFER_LOCK_ASSERT(xfer1, MA_OWNED);
USB_XFER_LOCK_ASSERT(xfer2, MA_OWNED);
switch (USB_GET_STATE(xfer1)) {
case USB_ST_SETUP:
/*
* pre-clear the data toggle to DATA0 ("umass.c" and
* "ata-usb.c" depends on this)
*/
usbd_clear_data_toggle(xfer2->xroot->udev, xfer2->endpoint);
/* setup a clear-stall packet */
req.bmRequestType = UT_WRITE_ENDPOINT;
req.bRequest = UR_CLEAR_FEATURE;
USETW(req.wValue, UF_ENDPOINT_HALT);
req.wIndex[0] = xfer2->endpoint->edesc->bEndpointAddress;
req.wIndex[1] = 0;
USETW(req.wLength, 0);
/*
* "usbd_transfer_setup_sub()" will ensure that
* we have sufficient room in the buffer for
* the request structure!
*/
/* copy in the transfer */
usbd_copy_in(xfer1->frbuffers, 0, &req, sizeof(req));
/* set length */
xfer1->frlengths[0] = sizeof(req);
xfer1->nframes = 1;
usbd_transfer_submit(xfer1);
return (0);
case USB_ST_TRANSFERRED:
break;
default: /* Error */
if (xfer1->error == USB_ERR_CANCELLED) {
return (0);
}
break;
}
return (1); /* Clear Stall Finished */
}
/*------------------------------------------------------------------------*
* usbd_transfer_poll
*
* The following function gets called from the USB keyboard driver and
* UMASS when the system has paniced.
*
* NOTE: It is currently not possible to resume normal operation on
* the USB controller which has been polled, due to clearing of the
* "up_dsleep" and "up_msleep" flags.
*------------------------------------------------------------------------*/
void
usbd_transfer_poll(struct usb_xfer **ppxfer, uint16_t max)
{
struct usb_xfer *xfer;
struct usb_xfer_root *xroot;
struct usb_device *udev;
struct usb_proc_msg *pm;
uint16_t n;
uint16_t drop_bus;
uint16_t drop_xfer;
for (n = 0; n != max; n++) {
/* Extra checks to avoid panic */
xfer = ppxfer[n];
if (xfer == NULL)
continue; /* no USB transfer */
xroot = xfer->xroot;
if (xroot == NULL)
continue; /* no USB root */
udev = xroot->udev;
if (udev == NULL)
continue; /* no USB device */
if (udev->bus == NULL)
continue; /* no BUS structure */
if (udev->bus->methods == NULL)
continue; /* no BUS methods */
if (udev->bus->methods->xfer_poll == NULL)
continue; /* no poll method */
/* make sure that the BUS mutex is not locked */
drop_bus = 0;
while (mtx_owned(&xroot->udev->bus->bus_mtx) && !SCHEDULER_STOPPED()) {
mtx_unlock(&xroot->udev->bus->bus_mtx);
drop_bus++;
}
/* make sure that the transfer mutex is not locked */
drop_xfer = 0;
while (mtx_owned(xroot->xfer_mtx) && !SCHEDULER_STOPPED()) {
mtx_unlock(xroot->xfer_mtx);
drop_xfer++;
}
/* Make sure cv_signal() and cv_broadcast() is not called */
USB_BUS_CONTROL_XFER_PROC(udev->bus)->up_msleep = 0;
USB_BUS_EXPLORE_PROC(udev->bus)->up_msleep = 0;
USB_BUS_GIANT_PROC(udev->bus)->up_msleep = 0;
USB_BUS_NON_GIANT_PROC(udev->bus)->up_msleep = 0;
/* poll USB hardware */
(udev->bus->methods->xfer_poll) (udev->bus);
USB_BUS_LOCK(xroot->bus);
/* check for clear stall */
if (udev->ctrl_xfer[1] != NULL) {
/* poll clear stall start */
pm = &udev->cs_msg[0].hdr;
(pm->pm_callback) (pm);
/* poll clear stall done thread */
pm = &udev->ctrl_xfer[1]->
xroot->done_m[0].hdr;
(pm->pm_callback) (pm);
}
/* poll done thread */
pm = &xroot->done_m[0].hdr;
(pm->pm_callback) (pm);
USB_BUS_UNLOCK(xroot->bus);
/* restore transfer mutex */
while (drop_xfer--)
mtx_lock(xroot->xfer_mtx);
/* restore BUS mutex */
while (drop_bus--)
mtx_lock(&xroot->udev->bus->bus_mtx);
}
}
static void
usbd_get_std_packet_size(struct usb_std_packet_size *ptr,
uint8_t type, enum usb_dev_speed speed)
{
static const uint16_t intr_range_max[USB_SPEED_MAX] = {
[USB_SPEED_LOW] = 8,
[USB_SPEED_FULL] = 64,
[USB_SPEED_HIGH] = 1024,
[USB_SPEED_VARIABLE] = 1024,
[USB_SPEED_SUPER] = 1024,
};
static const uint16_t isoc_range_max[USB_SPEED_MAX] = {
[USB_SPEED_LOW] = 0, /* invalid */
[USB_SPEED_FULL] = 1023,
[USB_SPEED_HIGH] = 1024,
[USB_SPEED_VARIABLE] = 3584,
[USB_SPEED_SUPER] = 1024,
};
static const uint16_t control_min[USB_SPEED_MAX] = {
[USB_SPEED_LOW] = 8,
[USB_SPEED_FULL] = 8,
[USB_SPEED_HIGH] = 64,
[USB_SPEED_VARIABLE] = 512,
[USB_SPEED_SUPER] = 512,
};
static const uint16_t bulk_min[USB_SPEED_MAX] = {
[USB_SPEED_LOW] = 8,
[USB_SPEED_FULL] = 8,
[USB_SPEED_HIGH] = 512,
[USB_SPEED_VARIABLE] = 512,
[USB_SPEED_SUPER] = 1024,
};
uint16_t temp;
memset(ptr, 0, sizeof(*ptr));
switch (type) {
case UE_INTERRUPT:
ptr->range.max = intr_range_max[speed];
break;
case UE_ISOCHRONOUS:
ptr->range.max = isoc_range_max[speed];
break;
default:
if (type == UE_BULK)
temp = bulk_min[speed];
else /* UE_CONTROL */
temp = control_min[speed];
/* default is fixed */
ptr->fixed[0] = temp;
ptr->fixed[1] = temp;
ptr->fixed[2] = temp;
ptr->fixed[3] = temp;
if (speed == USB_SPEED_FULL) {
/* multiple sizes */
ptr->fixed[1] = 16;
ptr->fixed[2] = 32;
ptr->fixed[3] = 64;
}
if ((speed == USB_SPEED_VARIABLE) &&
(type == UE_BULK)) {
/* multiple sizes */
ptr->fixed[2] = 1024;
ptr->fixed[3] = 1536;
}
break;
}
}
void *
usbd_xfer_softc(struct usb_xfer *xfer)
{
return (xfer->priv_sc);
}
void *
usbd_xfer_get_priv(struct usb_xfer *xfer)
{
return (xfer->priv_fifo);
}
void
usbd_xfer_set_priv(struct usb_xfer *xfer, void *ptr)
{
xfer->priv_fifo = ptr;
}
uint8_t
usbd_xfer_state(struct usb_xfer *xfer)
{
return (xfer->usb_state);
}
void
usbd_xfer_set_flag(struct usb_xfer *xfer, int flag)
{
switch (flag) {
case USB_FORCE_SHORT_XFER:
xfer->flags.force_short_xfer = 1;
break;
case USB_SHORT_XFER_OK:
xfer->flags.short_xfer_ok = 1;
break;
case USB_MULTI_SHORT_OK:
xfer->flags.short_frames_ok = 1;
break;
case USB_MANUAL_STATUS:
xfer->flags.manual_status = 1;
break;
}
}
void
usbd_xfer_clr_flag(struct usb_xfer *xfer, int flag)
{
switch (flag) {
case USB_FORCE_SHORT_XFER:
xfer->flags.force_short_xfer = 0;
break;
case USB_SHORT_XFER_OK:
xfer->flags.short_xfer_ok = 0;
break;
case USB_MULTI_SHORT_OK:
xfer->flags.short_frames_ok = 0;
break;
case USB_MANUAL_STATUS:
xfer->flags.manual_status = 0;
break;
}
}
/*
* The following function returns in milliseconds when the isochronous
* transfer was completed by the hardware. The returned value wraps
* around 65536 milliseconds.
*/
uint16_t
usbd_xfer_get_timestamp(struct usb_xfer *xfer)
{
return (xfer->isoc_time_complete);
}
/*
* The following function returns non-zero if the max packet size
* field was clamped to a valid value. Else it returns zero.
*/
uint8_t
usbd_xfer_maxp_was_clamped(struct usb_xfer *xfer)
{
return (xfer->flags_int.maxp_was_clamped);
}
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