source: mainline/uspace/drv/bus/usb/ohci/ohci_rh.c

/*
 * Copyright (c) 2013 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 drvusbohci
 * @{
 */
/** @file
 * @brief OHCI driver
 */

#include <assert.h>
#include <errno.h>
#include <mem.h>
#include <stddef.h>
#include <stdint.h>

#include <usb/classes/hub.h>
#include <usb/debug.h>
#include <usb/descriptor.h>
#include <usb/request.h>
#include <usb/usb.h>

#include <usb/host/endpoint.h>
#include <usbvirt/device.h>

#include "ohci_rh.h"

enum {
        HUB_STATUS_CHANGE_PIPE = 1,
};

static usbvirt_device_ops_t ops;

/** Initialize internal USB HUB class descriptor.
 * @param instance OHCI root hub.
 * Use register based info to create accurate descriptor.
 */
static void ohci_rh_hub_desc_init(ohci_rh_t *instance)
{
        assert(instance);
        const unsigned dsize = sizeof(usb_hub_descriptor_header_t) +
            STATUS_BYTES(instance->port_count) * 2;
        assert(dsize <= sizeof(instance->hub_descriptor));
        const uint32_t hub_desc = OHCI_RD(instance->registers->rh_desc_a);
        const uint32_t port_desc = OHCI_RD(instance->registers->rh_desc_b);

        instance->hub_descriptor.header.length = dsize;
        instance->hub_descriptor.header.descriptor_type = USB_DESCTYPE_HUB;
        instance->hub_descriptor.header.port_count = instance->port_count;
        instance->hub_descriptor.header.characteristics = 0 |
            /* Bits 0,1 indicate power switching mode */
            ((hub_desc & RHDA_PSM_FLAG)  ? 0x01 : 0) |
            ((hub_desc & RHDA_NPS_FLAG)  ? 0x02 : 0) |
            /* Bit 2 indicates device type (compound device) */
            ((hub_desc & RHDA_DT_FLAG)   ? 0x04 : 0) |
            /* Bits 3,4 indicate over-current protection mode */
            ((hub_desc & RHDA_OCPM_FLAG) ? 0x08 : 0) |
            ((hub_desc & RHDA_NOCP_FLAG) ? 0x10 : 0);
        instance->hub_descriptor.header.power_good_time =
            hub_desc >> RHDA_POTPGT_SHIFT;
        /* bHubContrCurrent, root hubs don't need no power. */
        instance->hub_descriptor.header.max_current = 0;

        /* Device Removable and some legacy 1.0 stuff */
        instance->hub_descriptor.rempow[0] =
            (port_desc >> RHDB_DR_SHIFT) & 0xff;
        if (STATUS_BYTES(instance->port_count) == 1) {
                instance->hub_descriptor.rempow[1] = 0xff;
        } else {
                instance->hub_descriptor.rempow[1] =
                    ((port_desc >> RHDB_DR_SHIFT) >> 8) & 0xff;
        }

        instance->hub_descriptor.rempow[2] = 0xff;
        instance->hub_descriptor.rempow[3] = 0xff;

}
/** Initialize OHCI root hub.
 * @param instance Place to initialize.
 * @param regs OHCI device registers.
 * @param name Device name.
 * return Error code, EOK on success.
 *
 * Selects preconfigured port powering mode, sets up descriptor, and
 * initializes internal virtual hub.
 */
errno_t ohci_rh_init(ohci_rh_t *instance, ohci_regs_t *regs,
    fibril_mutex_t *guard, const char *name)
{
        assert(instance);
        instance->registers = regs;
        instance->port_count = OHCI_RD(regs->rh_desc_a) & RHDA_NDS_MASK;
        usb_log_debug2("rh_desc_a: %x.", OHCI_RD(regs->rh_desc_a));
        if (instance->port_count > OHCI_MAX_PORTS) {
                usb_log_warning("OHCI specification does not allow %d ports. "
                    "Max %d ports will be used.", instance->port_count,
                    OHCI_MAX_PORTS);
                instance->port_count = OHCI_MAX_PORTS;
        }
        usb_log_info("%s: Found %u ports.", name, instance->port_count);

#if defined OHCI_POWER_SWITCH_no
        usb_log_info("%s: Set power mode to no power switching.", name);
        /* Set port power mode to no power-switching. (always on) */
        OHCI_SET(regs->rh_desc_a, RHDA_NPS_FLAG);

        /* Set to no over-current reporting */
        OHCI_SET(regs->rh_desc_a, RHDA_NOCP_FLAG);

#elif defined OHCI_POWER_SWITCH_ganged
        usb_log_info("%s: Set power mode to ganged power switching.", name);
        /* Set port power mode to ganged power-switching. */
        OHCI_CLR(regs->rh_desc_a, RHDA_NPS_FLAG);
        OHCI_CLR(regs->rh_desc_a, RHDA_PSM_FLAG);

        /* Turn off power (hub driver will turn this back on) */
        OHCI_WR(regs->rh_status, RHS_CLEAR_GLOBAL_POWER);

        /* Set to global over-current */
        OHCI_CLR(regs->rh_desc_a, RHDA_NOCP_FLAG);
        OHCI_CLR(regs->rh_desc_a, RHDA_OCPM_FLAG);
#else
        usb_log_info("%s: Set power mode to per-port power switching.", name);
        /* Set port power mode to per port power-switching. */
        OHCI_CLR(regs->rh_desc_a, RHDA_NPS_FLAG);
        OHCI_SET(regs->rh_desc_a, RHDA_PSM_FLAG);

        /* Control all ports by global switch and turn them off */
        OHCI_CLR(regs->rh_desc_b, RHDB_PCC_MASK << RHDB_PCC_SHIFT);
        OHCI_WR(regs->rh_status, RHS_CLEAR_GLOBAL_POWER);

        /* Return control to per port state */
        OHCI_SET(regs->rh_desc_b, RHDB_PCC_MASK << RHDB_PCC_SHIFT);

        /* Set per port over-current */
        OHCI_CLR(regs->rh_desc_a, RHDA_NOCP_FLAG);
        OHCI_SET(regs->rh_desc_a, RHDA_OCPM_FLAG);
#endif

        ohci_rh_hub_desc_init(instance);
        instance->status_change_endpoint = NULL;
        instance->guard = guard;
        return virthub_base_init(&instance->base, name, &ops, instance,
            NULL, &instance->hub_descriptor.header, HUB_STATUS_CHANGE_PIPE);
}

/** Schedule USB request.
 * @param instance OCHI root hub instance.
 * @param batch USB requst batch to schedule.
 * @return Always EOK.
 * Most requests complete even before this function returns,
 * status change requests might be postponed until there is something to report.
 */
errno_t ohci_rh_schedule(ohci_rh_t *instance, usb_transfer_batch_t *batch)
{
        assert(instance);
        assert(batch);
        batch->error = virthub_base_request(&instance->base, batch->target,
            batch->dir, &batch->setup.packet,
            batch->dma_buffer.virt, batch->size, &batch->transferred_size);
        if (batch->error == ENAK) {
                /* Lock the HC guard */
                fibril_mutex_lock(instance->guard);
                const int err = endpoint_activate_locked(batch->ep, batch);
                if (err) {
                        fibril_mutex_unlock(batch->ep->guard);
                        return err;
                }

                /*
                 * Asserting that the HC do not run two instances of the status
                 * change endpoint - shall be true.
                 */
                assert(!instance->status_change_endpoint);

                endpoint_add_ref(batch->ep);
                instance->status_change_endpoint = batch->ep;
                fibril_mutex_unlock(instance->guard);
        } else {
                usb_transfer_batch_finish(batch);
        }
        return EOK;
}

/** Handle OHCI RHSC interrupt.
 * @param instance OHCI root hub isntance.
 * @return Always EOK.
 *
 * Interrupt means there is a change of status to report. It may trigger
 * processing of a postponed request.
 */
errno_t ohci_rh_interrupt(ohci_rh_t *instance)
{
        fibril_mutex_lock(instance->guard);
        endpoint_t *ep = instance->status_change_endpoint;
        if (!ep) {
                fibril_mutex_unlock(instance->guard);
                return EOK;
        }

        usb_transfer_batch_t *const batch = ep->active_batch;
        endpoint_deactivate_locked(ep);
        instance->status_change_endpoint = NULL;
        fibril_mutex_unlock(instance->guard);

        endpoint_del_ref(ep);

        if (batch) {
                batch->error = virthub_base_request(&instance->base, batch->target,
                    batch->dir, &batch->setup.packet,
                    batch->dma_buffer.virt, batch->size, &batch->transferred_size);
                usb_transfer_batch_finish(batch);
        }
        return EOK;
}

/* HUB ROUTINES IMPLEMENTATION */
#define TEST_SIZE_INIT(size, port, hub) \
do { \
        hub = virthub_get_data(device); \
        assert(hub);\
        if (uint16_usb2host(setup_packet->length) != size) \
                return ESTALL; \
        port = uint16_usb2host(setup_packet->index) - 1; \
        if (port > hub->port_count) \
                return EINVAL; \
} while (0)

/** Hub status request handler.
 * @param device Virtual hub device
 * @param setup_packet USB setup stage data.
 * @param[out] data destination data buffer, size must be at least
 *             setup_packet->length bytes
 * @param[out] act_size Sized of the valid response part of the buffer.
 * @return Error code.
 */
static errno_t req_get_status(usbvirt_device_t *device,
    const usb_device_request_setup_packet_t *setup_packet,
    uint8_t *data, size_t *act_size)
{
        ohci_rh_t *hub = virthub_get_data(device);
        assert(hub);
        if (uint16_usb2host(setup_packet->length) != 4)
                return ESTALL;
        const uint32_t val = OHCI_RD(hub->registers->rh_status) &
            (RHS_LPS_FLAG | RHS_LPSC_FLAG | RHS_OCI_FLAG | RHS_OCIC_FLAG);
        memcpy(data, &val, sizeof(val));
        *act_size = sizeof(val);
        return EOK;
}

/** Hub set feature request handler.
 * @param device Virtual hub device
 * @param setup_packet USB setup stage data.
 * @param[out] data destination data buffer, size must be at least
 *             setup_packet->length bytes
 * @param[out] act_size Sized of the valid response part of the buffer.
 * @return Error code.
 */
static errno_t req_clear_hub_feature(usbvirt_device_t *device,
    const usb_device_request_setup_packet_t *setup_packet,
    uint8_t *data, size_t *act_size)
{
        ohci_rh_t *hub = virthub_get_data(device);
        assert(hub);

        /*
         * Chapter 11.16.2 specifies that only C_HUB_LOCAL_POWER and
         * C_HUB_OVER_CURRENT are supported.
         * C_HUB_LOCAL_POWER is not supported
         * because root hubs do not support local power status feature.
         * C_HUB_OVER_CURRENT is represented by OHCI RHS_OCIC_FLAG.
         * (OHCI pg. 127)
         */
        const unsigned feature = uint16_usb2host(setup_packet->value);
        if (feature == USB_HUB_FEATURE_C_HUB_OVER_CURRENT) {
                OHCI_WR(hub->registers->rh_status, RHS_OCIC_FLAG);
        }
        return EOK;
}

/** Port status request handler.
 * @param device Virtual hub device
 * @param setup_packet USB setup stage data.
 * @param[out] data destination data buffer, size must be at least
 *             setup_packet->length bytes
 * @param[out] act_size Sized of the valid response part of the buffer.
 * @return Error code.
 */
static errno_t req_get_port_status(usbvirt_device_t *device,
    const usb_device_request_setup_packet_t *setup_packet,
    uint8_t *data, size_t *act_size)
{
        ohci_rh_t *hub;
        unsigned port;
        TEST_SIZE_INIT(4, port, hub);
        if (setup_packet->value != 0)
                return EINVAL;

        const uint32_t status = OHCI_RD(hub->registers->rh_port_status[port]);
        memcpy(data, &status, sizeof(status));
        *act_size = sizeof(status);
        return EOK;
}

/** Port clear feature request handler.
 * @param device Virtual hub device
 * @param setup_packet USB setup stage data.
 * @param[out] data destination data buffer, size must be at least
 *             setup_packet->length bytes
 * @param[out] act_size Sized of the valid response part of the buffer.
 * @return Error code.
 */
static errno_t req_clear_port_feature(usbvirt_device_t *device,
    const usb_device_request_setup_packet_t *setup_packet,
    uint8_t *data, size_t *act_size)
{
        ohci_rh_t *hub;
        unsigned port;
        uint32_t rhda;
        TEST_SIZE_INIT(0, port, hub);
        const unsigned feature = uint16_usb2host(setup_packet->value);
        /* Enabled features to clear: see page 269 of USB specs */
        switch (feature) {
        case USB_HUB_FEATURE_PORT_POWER:          /* 8 */
                rhda = OHCI_RD(hub->registers->rh_desc_a);
                /* No power switching */
                if (rhda & RHDA_NPS_FLAG)
                        return ENOTSUP;
                /* Ganged power switching, one port powers all */
                if (!(rhda & RHDA_PSM_FLAG)) {
                        OHCI_WR(hub->registers->rh_status,
                            RHS_CLEAR_GLOBAL_POWER);
                        return EOK;
                }
                OHCI_WR(hub->registers->rh_port_status[port],
                    RHPS_CLEAR_PORT_POWER);
                return EOK;
        case USB2_HUB_FEATURE_PORT_ENABLE:         /* 1 */
                OHCI_WR(hub->registers->rh_port_status[port],
                    RHPS_CLEAR_PORT_ENABLE);
                return EOK;

        case USB2_HUB_FEATURE_PORT_SUSPEND:        /* 2 */
                OHCI_WR(hub->registers->rh_port_status[port],
                    RHPS_CLEAR_PORT_SUSPEND);
                return EOK;

        case USB_HUB_FEATURE_C_PORT_CONNECTION:   /* 16 */
        case USB2_HUB_FEATURE_C_PORT_ENABLE:       /* 17 */
        case USB2_HUB_FEATURE_C_PORT_SUSPEND:      /* 18 */
        case USB_HUB_FEATURE_C_PORT_OVER_CURRENT: /* 19 */
        case USB_HUB_FEATURE_C_PORT_RESET:        /* 20 */
                usb_log_debug2("Clearing port C_CONNECTION, C_ENABLE, "
                    "C_SUSPEND, C_OC or C_RESET on port %u.", port);
                /* Bit offsets correspond to the feature number */
                OHCI_WR(hub->registers->rh_port_status[port],
                    1 << feature);
                return EOK;

        default:
                return ENOTSUP;
        }
}

/** Port set feature request handler.
 * @param device Virtual hub device
 * @param setup_packet USB setup stage data.
 * @param[out] data destination data buffer, size must be at least
 *             setup_packet->length bytes
 * @param[out] act_size Sized of the valid response part of the buffer.
 * @return Error code.
 */
static errno_t req_set_port_feature(usbvirt_device_t *device,
    const usb_device_request_setup_packet_t *setup_packet,
    uint8_t *data, size_t *act_size)
{
        ohci_rh_t *hub;
        unsigned port;
        uint32_t rhda;
        TEST_SIZE_INIT(0, port, hub);
        const unsigned feature = uint16_usb2host(setup_packet->value);

        switch (feature) {
        case USB_HUB_FEATURE_PORT_POWER:   /* 8 */
                rhda = OHCI_RD(hub->registers->rh_desc_a);

                /* No power switching */
                if (rhda & RHDA_NPS_FLAG)
                        return EOK;

                /* Ganged power switching, one port powers all */
                if (!(rhda & RHDA_PSM_FLAG)) {
                        OHCI_WR(hub->registers->rh_status, RHS_SET_GLOBAL_POWER);
                        return EOK;
                }
                /* Fall through, for per port power */
                /* Fallthrough */
        case USB2_HUB_FEATURE_PORT_ENABLE:  /* 1 */
        case USB2_HUB_FEATURE_PORT_SUSPEND: /* 2 */
        case USB_HUB_FEATURE_PORT_RESET:   /* 4 */
                usb_log_debug2("Setting port POWER, ENABLE, SUSPEND or RESET "
                    "on port %u.", port);
                /* Bit offsets correspond to the feature number */
                OHCI_WR(hub->registers->rh_port_status[port], 1 << feature);
                return EOK;
        default:
                return ENOTSUP;
        }
}

/** Status change handler.
 * @param device Virtual hub device
 * @param endpoint Endpoint number
 * @param tr_type Transfer type
 * @param buffer Response destination
 * @param buffer_size Bytes available in buffer
 * @param actual_size Size us the used part of the dest buffer.
 *
 * Produces status mask. Bit 0 indicates hub status change the other bits
 * represent port status change. Endian does not matter as UHCI root hubs
 * only need 1 byte.
 */
static errno_t req_status_change_handler(usbvirt_device_t *device,
    usb_endpoint_t endpoint, usb_transfer_type_t tr_type,
    void *buffer, size_t buffer_size, size_t *actual_size)
{
        ohci_rh_t *hub = virthub_get_data(device);
        assert(hub);

        if (buffer_size < STATUS_BYTES(hub->port_count))
                return ESTALL;

        uint16_t mask = 0;

        /* Only local power source change and over-current change can happen */
        if (OHCI_RD(hub->registers->rh_status) & (RHS_LPSC_FLAG | RHS_OCIC_FLAG)) {
                mask |= 1;
        }

        for (unsigned port = 1; port <= hub->port_count; ++port) {
                /* Write-clean bits are those that indicate change */
                if (OHCI_RD(hub->registers->rh_port_status[port - 1]) &
                    RHPS_CHANGE_WC_MASK) {
                        mask |= (1 << port);
                }
        }

        usb_log_debug2("OHCI root hub interrupt mask: %hx.", mask);

        if (mask == 0)
                return ENAK;
        mask = uint16_host2usb(mask);
        memcpy(buffer, &mask, STATUS_BYTES(hub->port_count));
        *actual_size = STATUS_BYTES(hub->port_count);
        return EOK;
}

/** OHCI root hub request handlers */
static const usbvirt_control_request_handler_t control_transfer_handlers[] = {
        {
                STD_REQ_IN(USB_REQUEST_RECIPIENT_DEVICE, USB_DEVREQ_GET_DESCRIPTOR),
                .name = "GetDescriptor",
                .callback = virthub_base_get_hub_descriptor,
        },
        {
                CLASS_REQ_IN(USB_REQUEST_RECIPIENT_DEVICE, USB_DEVREQ_GET_DESCRIPTOR),
                .name = "GetDescriptor",
                .callback = virthub_base_get_hub_descriptor,
        },
        {
                CLASS_REQ_IN(USB_REQUEST_RECIPIENT_DEVICE, USB_HUB_REQUEST_GET_DESCRIPTOR),
                .name = "GetHubDescriptor",
                .callback = virthub_base_get_hub_descriptor,
        },
        {
                CLASS_REQ_IN(USB_REQUEST_RECIPIENT_OTHER, USB_HUB_REQUEST_GET_STATUS),
                .name = "GetPortStatus",
                .callback = req_get_port_status,
        },
        {
                CLASS_REQ_OUT(USB_REQUEST_RECIPIENT_DEVICE, USB_HUB_REQUEST_CLEAR_FEATURE),
                .name = "ClearHubFeature",
                .callback = req_clear_hub_feature,
        },
        {
                CLASS_REQ_OUT(USB_REQUEST_RECIPIENT_OTHER, USB_HUB_REQUEST_CLEAR_FEATURE),
                .name = "ClearPortFeature",
                .callback = req_clear_port_feature,
        },
        {
                CLASS_REQ_IN(USB_REQUEST_RECIPIENT_DEVICE, USB_HUB_REQUEST_GET_STATUS),
                .name = "GetHubStatus",
                .callback = req_get_status,
        },
        {
                CLASS_REQ_IN(USB_REQUEST_RECIPIENT_OTHER, USB_HUB_REQUEST_GET_STATUS),
                .name = "GetPortStatus",
                .callback = req_get_port_status,
        },
        {
                CLASS_REQ_OUT(USB_REQUEST_RECIPIENT_DEVICE, USB_HUB_REQUEST_SET_FEATURE),
                .name = "SetHubFeature",
                .callback = req_nop,
        },
        {
                CLASS_REQ_OUT(USB_REQUEST_RECIPIENT_OTHER, USB_HUB_REQUEST_SET_FEATURE),
                .name = "SetPortFeature",
                .callback = req_set_port_feature,
        },
        {
                .callback = NULL
        }
};

/** Virtual OHCI root hub ops */
static usbvirt_device_ops_t ops = {
        .control = control_transfer_handlers,
        .data_in[HUB_STATUS_CHANGE_PIPE] = req_status_change_handler,
};