source: mainline/uspace/drv/bus/usb/uhci/uhci_batch.c

/*
 * Copyright (c) 2011 Jan Vesely
 * Copyright (c) 2018 Ondrej Hlavaty
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - 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.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup drvusbuhci
 * @{
 */
/** @file
 * @brief UHCI driver USB transfer structure
 */

#include <assert.h>
#include <errno.h>
#include <macros.h>
#include <mem.h>
#include <stdlib.h>

#include <usb/usb.h>
#include <usb/debug.h>
#include <usb/host/endpoint.h>
#include <usb/host/utils/malloc32.h>

#include "uhci_batch.h"
#include "hc.h"
#include "hw_struct/transfer_descriptor.h"

#define DEFAULT_ERROR_COUNT 3

/** Transfer batch setup table. */
static void (*const batch_setup[])(uhci_transfer_batch_t *);

/** Destroys uhci_transfer_batch_t structure.
 *
 * @param[in] uhci_batch Instance to destroy.
 */
void uhci_transfer_batch_destroy(uhci_transfer_batch_t *uhci_batch)
{
        assert(uhci_batch);
        dma_buffer_free(&uhci_batch->uhci_dma_buffer);
        free(uhci_batch);
}

/** Allocate memory and initialize internal data structure.
 *
 * @param[in] usb_batch Pointer to generic USB batch structure.
 * @return Valid pointer if all structures were successfully created,
 * NULL otherwise.
 */
uhci_transfer_batch_t *uhci_transfer_batch_create(endpoint_t *ep)
{
        uhci_transfer_batch_t *uhci_batch =
            calloc(1, sizeof(uhci_transfer_batch_t));
        if (!uhci_batch) {
                usb_log_error("Failed to allocate UHCI batch.");
                return NULL;
        }

        usb_transfer_batch_init(&uhci_batch->base, ep);

        link_initialize(&uhci_batch->link);
        return uhci_batch;
}

/*
 * Prepares batch for committing.
 *
 * Determines the number of needed transfer descriptors (TDs).
 * Prepares a transport buffer (that is accessible by the hardware).
 * Initializes parameters needed for the transfer and callback.
 */
int uhci_transfer_batch_prepare(uhci_transfer_batch_t *uhci_batch)
{
        static_assert((sizeof(td_t) % 16) == 0, "");

        usb_transfer_batch_t *usb_batch = &uhci_batch->base;

        uhci_batch->td_count = (usb_batch->size + usb_batch->ep->max_packet_size - 1) /
            usb_batch->ep->max_packet_size;

        if (usb_batch->ep->transfer_type == USB_TRANSFER_CONTROL) {
                uhci_batch->td_count += 2;
        }

        const size_t setup_size = (usb_batch->ep->transfer_type == USB_TRANSFER_CONTROL) ?
            USB_SETUP_PACKET_SIZE :
            0;

        const size_t total_size = (sizeof(td_t) * uhci_batch->td_count) +
            sizeof(qh_t) + setup_size;

        if (dma_buffer_alloc(&uhci_batch->uhci_dma_buffer, total_size)) {
                usb_log_error("Failed to allocate UHCI buffer.");
                return ENOMEM;
        }
        memset(uhci_batch->uhci_dma_buffer.virt, 0, total_size);

        uhci_batch->tds = uhci_batch->uhci_dma_buffer.virt;
        uhci_batch->qh = (qh_t *) &uhci_batch->tds[uhci_batch->td_count];

        qh_init(uhci_batch->qh);
        qh_set_element_td(uhci_batch->qh, &uhci_batch->tds[0]);

        void *setup_buffer = uhci_transfer_batch_setup_buffer(uhci_batch);
        assert(setup_buffer == (void *) (uhci_batch->qh + 1));
        /* Copy SETUP packet data to the device buffer */
        memcpy(setup_buffer, usb_batch->setup.buffer, setup_size);

        usb_log_debug2("Batch %p " USB_TRANSFER_BATCH_FMT
            " memory structures ready.", usb_batch,
            USB_TRANSFER_BATCH_ARGS(*usb_batch));

        assert(batch_setup[usb_batch->ep->transfer_type]);
        batch_setup[usb_batch->ep->transfer_type](uhci_batch);

        return EOK;
}

/** Check batch TDs for activity.
 *
 * @param[in] uhci_batch Batch structure to use.
 * @return False, if there is an active TD, true otherwise.
 *
 * Walk all TDs. Stop with false if there is an active one (it is to be
 * processed). Stop with true if an error is found. Return true if the last TD
 * is reached.
 */
bool uhci_transfer_batch_check_completed(uhci_transfer_batch_t *uhci_batch)
{
        assert(uhci_batch);
        usb_transfer_batch_t *batch = &uhci_batch->base;

        usb_log_debug2("Batch %p " USB_TRANSFER_BATCH_FMT
            " checking %zu transfer(s) for completion.",
            uhci_batch, USB_TRANSFER_BATCH_ARGS(*batch),
            uhci_batch->td_count);
        batch->transferred_size = 0;

        uhci_endpoint_t *uhci_ep = (uhci_endpoint_t *) batch->ep;

        for (size_t i = 0; i < uhci_batch->td_count; ++i) {
                if (td_is_active(&uhci_batch->tds[i])) {
                        return false;
                }

                batch->error = td_status(&uhci_batch->tds[i]);
                if (batch->error != EOK) {
                        assert(batch->ep != NULL);

                        usb_log_debug("Batch %p found error TD(%zu->%p):%"
                            PRIx32 ".", uhci_batch, i,
                            &uhci_batch->tds[i], uhci_batch->tds[i].status);
                        td_print_status(&uhci_batch->tds[i]);

                        uhci_ep->toggle = td_toggle(&uhci_batch->tds[i]);
                        goto substract_ret;
                }

                batch->transferred_size +=
                    td_act_size(&uhci_batch->tds[i]);
                if (td_is_short(&uhci_batch->tds[i]))
                        goto substract_ret;
        }
substract_ret:
        if (batch->transferred_size > 0 && batch->ep->transfer_type == USB_TRANSFER_CONTROL) {
                assert(batch->transferred_size >= USB_SETUP_PACKET_SIZE);
                batch->transferred_size -= USB_SETUP_PACKET_SIZE;
        }

        assert(batch->transferred_size <= batch->size);

        return true;
}

/** Direction to pid conversion table */
static const usb_packet_id direction_pids[] = {
        [USB_DIRECTION_IN] = USB_PID_IN,
        [USB_DIRECTION_OUT] = USB_PID_OUT,
};

/** Prepare generic data transfer
 *
 * @param[in] uhci_batch Batch structure to use.
 * @param[in] dir Communication direction.
 *
 * Transactions with alternating toggle bit and supplied pid value.
 * The last transfer is marked with IOC flag.
 */
static void batch_data(uhci_transfer_batch_t *uhci_batch)
{
        assert(uhci_batch);

        usb_direction_t dir = uhci_batch->base.dir;
        assert(dir == USB_DIRECTION_OUT || dir == USB_DIRECTION_IN);

        const usb_packet_id pid = direction_pids[dir];
        const bool low_speed =
            uhci_batch->base.ep->device->speed == USB_SPEED_LOW;
        const size_t mps = uhci_batch->base.ep->max_packet_size;

        uhci_endpoint_t *uhci_ep = (uhci_endpoint_t *) uhci_batch->base.ep;

        int toggle = uhci_ep->toggle;
        assert(toggle == 0 || toggle == 1);

        size_t td = 0;
        size_t remain_size = uhci_batch->base.size;
        char *buffer = uhci_transfer_batch_data_buffer(uhci_batch);

        while (remain_size > 0) {
                const size_t packet_size = min(remain_size, mps);

                const td_t *next_td = (td + 1 < uhci_batch->td_count) ?
                    &uhci_batch->tds[td + 1] : NULL;

                assert(td < uhci_batch->td_count);
                td_init(
                    &uhci_batch->tds[td], DEFAULT_ERROR_COUNT, packet_size,
                    toggle, false, low_speed, uhci_batch->base.target, pid, buffer, next_td);

                ++td;
                toggle = 1 - toggle;
                buffer += packet_size;
                remain_size -= packet_size;
        }
        td_set_ioc(&uhci_batch->tds[td - 1]);
        uhci_ep->toggle = toggle;
        usb_log_debug2(
            "Batch %p %s %s " USB_TRANSFER_BATCH_FMT " initialized.",
            uhci_batch,
            usb_str_transfer_type(uhci_batch->base.ep->transfer_type),
            usb_str_direction(uhci_batch->base.ep->direction),
            USB_TRANSFER_BATCH_ARGS(uhci_batch->base));
}

/** Prepare generic control transfer
 *
 * @param[in] uhci_batch Batch structure to use.
 * @param[in] dir Communication direction.
 *
 * Setup stage with toggle 0 and USB_PID_SETUP.
 * Data stage with alternating toggle and pid determined by the communication
 * direction.
 * Status stage with toggle 1 and pid determined by the communication direction.
 * The last transfer is marked with IOC.
 */
static void batch_control(uhci_transfer_batch_t *uhci_batch)
{
        assert(uhci_batch);

        usb_direction_t dir = uhci_batch->base.dir;
        assert(dir == USB_DIRECTION_OUT || dir == USB_DIRECTION_IN);
        assert(uhci_batch->td_count >= 2);
        static const usb_packet_id status_stage_pids[] = {
                [USB_DIRECTION_IN] = USB_PID_OUT,
                [USB_DIRECTION_OUT] = USB_PID_IN,
        };

        const usb_packet_id data_stage_pid = direction_pids[dir];
        const usb_packet_id status_stage_pid = status_stage_pids[dir];
        const bool low_speed =
            uhci_batch->base.ep->device->speed == USB_SPEED_LOW;
        const size_t mps = uhci_batch->base.ep->max_packet_size;
        const usb_target_t target = uhci_batch->base.target;

        /* setup stage */
        td_init(
            &uhci_batch->tds[0], DEFAULT_ERROR_COUNT,
            USB_SETUP_PACKET_SIZE, 0, false,
            low_speed, target, USB_PID_SETUP,
            uhci_transfer_batch_setup_buffer(uhci_batch), &uhci_batch->tds[1]);

        /* data stage */
        size_t td = 1;
        unsigned toggle = 1;
        size_t remain_size = uhci_batch->base.size;
        char *buffer = uhci_transfer_batch_data_buffer(uhci_batch);

        while (remain_size > 0) {
                const size_t packet_size = min(remain_size, mps);

                td_init(
                    &uhci_batch->tds[td], DEFAULT_ERROR_COUNT, packet_size,
                    toggle, false, low_speed, target, data_stage_pid,
                    buffer, &uhci_batch->tds[td + 1]);

                ++td;
                toggle = 1 - toggle;
                buffer += packet_size;
                remain_size -= packet_size;
                assert(td < uhci_batch->td_count);
        }

        /* status stage */
        assert(td == uhci_batch->td_count - 1);

        td_init(
            &uhci_batch->tds[td], DEFAULT_ERROR_COUNT, 0, 1, false, low_speed,
            target, status_stage_pid, NULL, NULL);
        td_set_ioc(&uhci_batch->tds[td]);

        usb_log_debug2("Control last TD status: %x.",
            uhci_batch->tds[td].status);
}

static void (*const batch_setup[])(uhci_transfer_batch_t *) =
    {
        [USB_TRANSFER_CONTROL] = batch_control,
        [USB_TRANSFER_BULK] = batch_data,
        [USB_TRANSFER_INTERRUPT] = batch_data,
        [USB_TRANSFER_ISOCHRONOUS] = NULL,
};
/**
 * @}
 */