source: mainline/uspace/drv/bus/usb/xhci/transfers.c@ eaf5e86

/*
 * Copyright (c) 2017 Michal Staruch
 * 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 drvusbxhci
 * @{
 */
/** @file
 * @brief The host controller transfer ring management
 */

#include <usb/host/utils/malloc32.h>
#include <usb/debug.h>
#include "hc.h"
#include "hw_struct/trb.h"
#include "transfers.h"
#include "trb_ring.h"

static inline uint8_t get_transfer_type(xhci_trb_t* trb, uint8_t bmRequestType, uint16_t wLength)
{
        /* See Table 7 of xHCI specification */
        if (bmRequestType & 0x80) {
                /* Device-to-host transfer */
                if (wLength) {
                        /* IN data stage */
                        return 3;
                }
                else {
                        /* No data stage */
                        return 0;
                }
        }
        else {
                /* Host-to-device transfer */
                if (wLength) {
                        /* OUT data stage */
                        return 2;
                }
                else {
                        /* No data stage */
                        return 0;
                }
        }
}

static inline uint8_t get_data_direction(xhci_trb_t* trb, uint8_t bmRequestType, uint16_t wLength)
{
        /* See Table 7 of xHCI specification */
        if (bmRequestType & 0x80) {
                /* Device-to-host transfer */
                return 1;
        }
        else {
                /* Host-to-device transfer */
                return 0;
        }
}

static inline uint8_t get_status_direction(xhci_trb_t* trb, uint8_t bmRequestType, uint16_t wLength)
{
        /* See Table 7 of xHCI specification */
        if (bmRequestType & 0x80) {
                /* Device-to-host transfer */
                if (wLength) {
                        /* Out direction */
                        return 0;
                }
                else {
                        /* In direction */
                        return 1;
                }
        }
        else {
                /* Host-to-device transfer, always IN direction */
                return 1;
        }
}

int xhci_init_transfers(xhci_hc_t *hc)
{
        assert(hc);

        list_initialize(&hc->transfers);
        return EOK;
}

void xhci_fini_transfers(xhci_hc_t *hc)
{
        // Note: Untested.
        assert(hc);
}

xhci_transfer_t* xhci_transfer_alloc(usb_transfer_batch_t* batch) {
        xhci_transfer_t* transfer = malloc(sizeof(xhci_transfer_t));
        if (!transfer)
                return NULL;

        memset(transfer, 0, sizeof(xhci_transfer_t));
        transfer->batch = batch;
        link_initialize(&transfer->link);
        return transfer;
}

void xhci_transfer_fini(xhci_transfer_t* transfer) {
        if (transfer) {
                free(transfer);
        }
}

int xhci_schedule_control_transfer(xhci_hc_t* hc, usb_transfer_batch_t* batch)
{
        if (!batch->setup_size) {
                usb_log_error("Missing setup packet for the control transfer.");
                return EINVAL;
        }
        if (batch->ep->endpoint != 0 || batch->ep->transfer_type != USB_TRANSFER_CONTROL) {
                /* This method only works for control transfers. */
                usb_log_error("Attempted to schedule control transfer to non 0 endpoint.");
                return EINVAL;
        }

        uint8_t slot_id = batch->ep->hc_data.slot_id;
        xhci_trb_ring_t* ring = hc->dcbaa_virt[slot_id].trs[0];

        usb_device_request_setup_packet_t* setup =
                (usb_device_request_setup_packet_t*) batch->setup_buffer;

        /* For the TRB formats, see xHCI specification 6.4.1.2 */
        xhci_transfer_t *transfer = xhci_transfer_alloc(batch);

        xhci_trb_t trb_setup;
        memset(&trb_setup, 0, sizeof(xhci_trb_t));

        TRB_CTRL_SET_SETUP_WVALUE(trb_setup, setup->value);
        TRB_CTRL_SET_SETUP_WLENGTH(trb_setup, setup->length);
        TRB_CTRL_SET_SETUP_WINDEX(trb_setup, setup->index);
        TRB_CTRL_SET_SETUP_BREQ(trb_setup, setup->request);
        TRB_CTRL_SET_SETUP_BMREQTYPE(trb_setup, setup->request_type);

        /* Size of the setup packet is always 8 */
        TRB_CTRL_SET_XFER_LEN(trb_setup, 8);
        // if we want an interrupt after this td is done, use
        // TRB_CTRL_SET_IOC(trb_setup, 1);

        /* Immediate data */
        TRB_CTRL_SET_IDT(trb_setup, 1);
        TRB_CTRL_SET_TRB_TYPE(trb_setup, XHCI_TRB_TYPE_SETUP_STAGE);
        TRB_CTRL_SET_TRT(trb_setup, get_transfer_type(&trb_setup, setup->request_type, setup->length));

        /* Data stage */
        xhci_trb_t trb_data;
        memset(&trb_data, 0, sizeof(xhci_trb_t));

        if (setup->length > 0) {
                trb_data.parameter = (uintptr_t) addr_to_phys(batch->buffer);

                // data size (sent for OUT, or buffer size)
                TRB_CTRL_SET_XFER_LEN(trb_data, batch->buffer_size);
                // FIXME: TD size 4.11.2.4
                TRB_CTRL_SET_TD_SIZE(trb_data, 1);

                // if we want an interrupt after this td is done, use
                // TRB_CTRL_SET_IOC(trb_data, 1);

                // Some more fields here, no idea what they mean
                TRB_CTRL_SET_TRB_TYPE(trb_data, XHCI_TRB_TYPE_DATA_STAGE);

                transfer->direction = get_data_direction(&trb_setup, setup->request_type, setup->length);
                TRB_CTRL_SET_DIR(trb_data, transfer->direction);
        }

        /* Status stage */
        xhci_trb_t trb_status;
        memset(&trb_status, 0, sizeof(xhci_trb_t));

        // FIXME: Evaluate next TRB? 4.12.3
        // TRB_CTRL_SET_ENT(trb_status, 1);

        // if we want an interrupt after this td is done, use
        TRB_CTRL_SET_IOC(trb_status, 1);

        TRB_CTRL_SET_TRB_TYPE(trb_status, XHCI_TRB_TYPE_STATUS_STAGE);
        TRB_CTRL_SET_DIR(trb_status, get_status_direction(&trb_setup, setup->request_type, setup->length));

        uintptr_t dummy = 0;
        xhci_trb_ring_enqueue(ring, &trb_setup, &dummy);
        if (setup->length > 0) {
                xhci_trb_ring_enqueue(ring, &trb_data, &dummy);
        }
        xhci_trb_ring_enqueue(ring, &trb_status, &transfer->interrupt_trb_phys);

        list_append(&transfer->link, &hc->transfers);

        /* For control transfers, the target is always 1. */
        hc_ring_doorbell(hc, slot_id, 1);
        return EOK;
}

int xhci_schedule_bulk_transfer(xhci_hc_t* hc, usb_transfer_batch_t* batch) {
        if (batch->setup_size) {
                usb_log_warning("Setup packet present for a bulk transfer.");
        }

        uint8_t slot_id = batch->ep->hc_data.slot_id;
        xhci_trb_ring_t* ring = hc->dcbaa_virt[slot_id].trs[batch->ep->endpoint];

        xhci_transfer_t *transfer = xhci_transfer_alloc(batch);

        xhci_trb_t trb;
        memset(&trb, 0, sizeof(xhci_trb_t));
        trb.parameter = (uintptr_t) addr_to_phys(batch->buffer);

        // data size (sent for OUT, or buffer size)
        TRB_CTRL_SET_XFER_LEN(trb, batch->buffer_size);
        // FIXME: TD size 4.11.2.4
        TRB_CTRL_SET_TD_SIZE(trb, 1);

        // we want an interrupt after this td is done
        TRB_CTRL_SET_IOC(trb, 1);

        TRB_CTRL_SET_TRB_TYPE(trb, XHCI_TRB_TYPE_NORMAL);

        xhci_trb_ring_enqueue(ring, &trb, &transfer->interrupt_trb_phys);
        list_append(&transfer->link, &hc->transfers);

        /* For control transfers, the target is always 1. */
        hc_ring_doorbell(hc, slot_id, 1);
        return EOK;
}

int xhci_handle_transfer_event(xhci_hc_t* hc, xhci_trb_t* trb)
{
        uintptr_t addr = trb->parameter;
        xhci_transfer_t *transfer = NULL;

        link_t *transfer_link = list_first(&hc->transfers);
        while (transfer_link) {
                transfer = list_get_instance(transfer_link, xhci_transfer_t, link);

                if (transfer->interrupt_trb_phys == addr)
                        break;

                transfer_link = list_next(transfer_link, &hc->transfers);
        }

        if (!transfer_link) {
                usb_log_warning("Transfer not found.");
                return ENOENT;
        }

        list_remove(transfer_link);
        usb_transfer_batch_t *batch = transfer->batch;

        batch->error = (TRB_COMPLETION_CODE(*trb) == XHCI_TRBC_SUCCESS) ? EOK : ENAK;
        batch->transfered_size = batch->buffer_size - TRB_TRANSFER_LENGTH(*trb);
        if (transfer->direction) {
                /* Device-to-host, IN */
                if (batch->callback_in)
                        batch->callback_in(batch->error, batch->transfered_size, batch->arg);
        }
        else {
                /* Host-to-device, OUT */
                if (batch->callback_out)
                        batch->callback_out(batch->error, batch->arg);
        }

        xhci_transfer_fini(transfer);
        return EOK;
}