source: mainline/uspace/drv/bus/usb/xhci/bus.c@ 2cf28b9

/*
 * Copyright (c) 2017 Ondrej Hlavaty <aearsis@eideo.cz>
 * 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 libusbhost
 * @{
 */
/** @file
 * HC Endpoint management.
 */

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

#include <assert.h>
#include <errno.h>
#include <str_error.h>
#include <macros.h>
#include <stdbool.h>

#include "hc.h"
#include "bus.h"
#include "endpoint.h"
#include "transfers.h"


/* FIXME Are these really static? Older HCs fetch it from descriptor. */
/* FIXME Add USB3 options, if applicable. */
static const usb_endpoint_desc_t ep0_desc = {
        .endpoint_no = 0,
        .direction = USB_DIRECTION_BOTH,
        .transfer_type = USB_TRANSFER_CONTROL,
        .max_packet_size = CTRL_PIPE_MIN_PACKET_SIZE,
        .packets = 1,
};

static int prepare_endpoint(xhci_endpoint_t *ep, const usb_endpoint_desc_t *desc)
{
        /* Extract information from endpoint_desc */
        ep->base.endpoint = desc->endpoint_no;
        ep->base.direction = desc->direction;
        ep->base.transfer_type = desc->transfer_type;
        ep->base.max_packet_size = desc->max_packet_size;
        ep->base.packets = desc->packets;
        ep->max_streams = desc->usb3.max_streams;
        ep->max_burst = desc->usb3.max_burst;
        // TODO add this property to usb_endpoint_desc_t and fetch it from ss companion desc
        ep->mult = 0;

        return xhci_endpoint_alloc_transfer_ds(ep);
}

static endpoint_t *create_endpoint(bus_t *base);

static int address_device(xhci_hc_t *hc, xhci_device_t *dev)
{
        int err;

        /* Enable new slot. */
        if ((err = hc_enable_slot(hc, &dev->slot_id)) != EOK)
                return err;
        usb_log_debug2("Obtained slot ID: %u.\n", dev->slot_id);

        /* Create and configure control endpoint. */
        endpoint_t *ep0_base = create_endpoint(&hc->bus.base);
        if (!ep0_base)
                goto err_slot;

        /* Temporary reference */
        endpoint_add_ref(ep0_base);

        ep0_base->device = &dev->base;
        xhci_endpoint_t *ep0 = xhci_endpoint_get(ep0_base);

        if ((err = prepare_endpoint(ep0, &ep0_desc)))
                goto err_ep;

        /* Address device */
        if ((err = hc_address_device(hc, dev, ep0)))
                goto err_prepared_ep;

        /* Register EP0, passing Temporary reference */
        dev->endpoints[0] = ep0;

        return EOK;

err_prepared_ep:
        xhci_endpoint_free_transfer_ds(ep0);
err_ep:
        endpoint_del_ref(ep0_base);
err_slot:
        hc_disable_slot(hc, dev->slot_id);
        return err;
}

int xhci_bus_enumerate_device(xhci_bus_t *bus, xhci_hc_t *hc, device_t *dev)
{
        int err;
        xhci_device_t *xhci_dev = xhci_device_get(dev);

        /* Manage TT */
        if (dev->hub->speed == USB_SPEED_HIGH && usb_speed_is_11(dev->speed)) {
                /* For LS devices under HS hub */
                /* TODO: How about SS hubs? */
                dev->tt.address = dev->hub->address;
                dev->tt.port = dev->port;
        }
        else {
                /* Inherit hub's TT */
                dev->tt = dev->hub->tt;
        }

        /* Calculate route string */
        xhci_device_t *xhci_hub = xhci_device_get(dev->hub);
        xhci_dev->tier = xhci_hub->tier + 1;
        xhci_dev->route_str = xhci_hub->route_str;

        /* Roothub port is not part of the route string */
        if (xhci_dev->tier >= 2) {
                const unsigned offset = 4 * (xhci_dev->tier - 2);
                xhci_dev->route_str |= (dev->port & 0xf) << offset;
        }

        fibril_mutex_lock(&bus->base.guard);
        /* Assign an address to the device */
        if ((err = address_device(hc, xhci_dev))) {
                usb_log_error("Failed to setup address of the new device: %s", str_error(err));
                return err;
        }

        // TODO: Fetch descriptor of EP0 and reconfigure it accordingly
        assert(xhci_dev->endpoints[0]);

        assert(bus->devices_by_slot[xhci_dev->slot_id] == NULL);
        bus->devices_by_slot[xhci_dev->slot_id] = xhci_dev;
        fibril_mutex_unlock(&bus->base.guard);

        /* Read the device descriptor, derive the match ids */
        if ((err = hcd_ddf_device_explore(hc->hcd, dev))) {
                usb_log_error("Device(%d): Failed to explore device: %s", dev->address, str_error(err));
                goto err_address;
        }

        return EOK;

err_address:
        bus_release_address(&bus->base, dev->address);
        return err;
}

static int unregister_endpoint(bus_t *, endpoint_t *);

int xhci_bus_remove_device(xhci_bus_t *bus, xhci_hc_t *hc, device_t *dev)
{
        xhci_device_t *xhci_dev = xhci_device_get(dev);

        /* Unregister remaining endpoints. */
        for (unsigned i = 0; i < ARRAY_SIZE(xhci_dev->endpoints); ++i) {
                if (!xhci_dev->endpoints[i])
                        continue;

                const int err = unregister_endpoint(&bus->base, &xhci_dev->endpoints[i]->base);
                if (err)
                        usb_log_warning("Failed to unregister EP (%u:%u): %s", dev->address, i, str_error(err));
        }

        // XXX: Ugly here. Move to device_destroy at endpoint.c?
        free32(xhci_dev->dev_ctx);
        hc->dcbaa[xhci_dev->slot_id] = 0;
        return EOK;
}

/** Ops receive generic bus_t pointer. */
static inline xhci_bus_t *bus_to_xhci_bus(bus_t *bus_base)
{
        assert(bus_base);
        return (xhci_bus_t *) bus_base;
}

static int enumerate_device(bus_t *bus_base, hcd_t *hcd, device_t *dev)
{
        xhci_hc_t *hc = hcd_get_driver_data(hcd);
        assert(hc);

        xhci_bus_t *bus = bus_to_xhci_bus(bus_base);
        assert(bus);

        return xhci_bus_enumerate_device(bus, hc, dev);
}

static int remove_device(bus_t *bus_base, hcd_t *hcd, device_t *dev)
{
        xhci_hc_t *hc = hcd_get_driver_data(hcd);
        assert(hc);

        xhci_bus_t *bus = bus_to_xhci_bus(bus_base);
        assert(bus);

        return xhci_bus_remove_device(bus, hc, dev);
}

static endpoint_t *create_endpoint(bus_t *base)
{
        xhci_bus_t *bus = bus_to_xhci_bus(base);

        xhci_endpoint_t *ep = calloc(1, sizeof(xhci_endpoint_t));
        if (!ep)
                return NULL;

        if (xhci_endpoint_init(ep, bus)) {
                free(ep);
                return NULL;
        }

        return &ep->base;
}

static void destroy_endpoint(endpoint_t *ep)
{
        xhci_endpoint_t *xhci_ep = xhci_endpoint_get(ep);

        xhci_endpoint_fini(xhci_ep);
        free(xhci_ep);
}

static int register_endpoint(bus_t *bus_base, endpoint_t *ep, const usb_endpoint_desc_t *desc)
{
        int err;
        xhci_bus_t *bus = bus_to_xhci_bus(bus_base);
        assert(bus);

        assert(ep->device);

        xhci_device_t *xhci_dev = xhci_device_get(ep->device);
        xhci_endpoint_t *xhci_ep = xhci_endpoint_get(ep);

        if ((err = prepare_endpoint(xhci_ep, desc)))
                return err;

        usb_log_info("Endpoint(%d:%d) registered to XHCI bus.", ep->device->address, ep->endpoint);
        return xhci_device_add_endpoint(xhci_dev, xhci_ep);
}

static int unregister_endpoint(bus_t *bus_base, endpoint_t *ep)
{
        xhci_bus_t *bus = bus_to_xhci_bus(bus_base);
        assert(bus);

        usb_log_info("Endpoint(%d:%d) unregistered from XHCI bus.", ep->device->address, ep->endpoint);

        xhci_device_t *xhci_dev = xhci_device_get(ep->device);
        xhci_endpoint_t *xhci_ep = xhci_endpoint_get(ep);
        const int res = xhci_device_remove_endpoint(xhci_dev, xhci_ep);
        if (res != EOK)
                return res;

        return EOK;
}

static endpoint_t* find_endpoint(bus_t *bus_base, device_t *dev_base, usb_target_t target, usb_direction_t direction)
{
        xhci_device_t *dev = xhci_device_get(dev_base);

        xhci_endpoint_t *ep = xhci_device_get_endpoint(dev, target.endpoint);
        if (!ep)
                return NULL;

        return &ep->base;
}

static int reset_toggle(bus_t *bus_base, usb_target_t target, bool all)
{
        // TODO: Implement me!
        return ENOTSUP;
}

static size_t count_bw(endpoint_t *ep, size_t size)
{
        // TODO: Implement me!
        return 0;
}

/* Endpoint ops, optional (have generic fallback) */
static bool endpoint_get_toggle(endpoint_t *ep)
{
        // TODO: Implement me!
        return ENOTSUP;
}

static void endpoint_set_toggle(endpoint_t *ep, bool toggle)
{
        // TODO: Implement me!
}

static int request_address(bus_t *bus_base, usb_address_t *addr, bool strict, usb_speed_t speed)
{
        assert(addr);

        if (*addr != USB_ADDRESS_DEFAULT)
                /* xHCI does not allow software to assign addresses. */
                return ENOTSUP;

        assert(strict);

        xhci_bus_t *xhci_bus = bus_to_xhci_bus(bus_base);

        if (xhci_bus->default_address_speed != USB_SPEED_MAX)
                /* Already allocated */
                return ENOENT;

        xhci_bus->default_address_speed = speed;
        return EOK;
}

static int release_address(bus_t *bus_base, usb_address_t addr)
{
        if (addr != USB_ADDRESS_DEFAULT)
                return ENOTSUP;

        xhci_bus_t *xhci_bus = bus_to_xhci_bus(bus_base);

        xhci_bus->default_address_speed = USB_SPEED_MAX;
        return EOK;
}

static usb_transfer_batch_t *create_batch(bus_t *bus, endpoint_t *ep)
{
        xhci_transfer_t *transfer = xhci_transfer_create(ep);
        return &transfer->batch;
}

static void destroy_batch(usb_transfer_batch_t *batch)
{
        xhci_transfer_destroy(xhci_transfer_from_batch(batch));
}

static const bus_ops_t xhci_bus_ops = {
        .enumerate_device = enumerate_device,
        .remove_device = remove_device,

        .create_endpoint = create_endpoint,
        .destroy_endpoint = destroy_endpoint,

        .register_endpoint = register_endpoint,
        .unregister_endpoint = unregister_endpoint,
        .find_endpoint = find_endpoint,

        .request_address = request_address,
        .release_address = release_address,
        .reset_toggle = reset_toggle,

        .count_bw = count_bw,

        .endpoint_get_toggle = endpoint_get_toggle,
        .endpoint_set_toggle = endpoint_set_toggle,

        .create_batch = create_batch,
        .destroy_batch = destroy_batch,
};

int xhci_bus_init(xhci_bus_t *bus, xhci_hc_t *hc)
{
        assert(bus);

        bus_init(&bus->base, sizeof(xhci_device_t));

        bus->devices_by_slot = calloc(hc->max_slots, sizeof(xhci_device_t *));
        if (!bus->devices_by_slot)
                return ENOMEM;

        bus->base.ops = xhci_bus_ops;
        bus->default_address_speed = USB_SPEED_MAX;
        return EOK;
}

void xhci_bus_fini(xhci_bus_t *bus)
{

}

/**
 * @}
 */