source: mainline/uspace/drv/ohci/hc.c@ 9a7e5b4

/*
 * Copyright (c) 2011 Jan Vesely
 * 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 drvusbohcihc
 * @{
 */
/** @file
 * @brief OHCI Host controller driver routines
 */
#include <errno.h>
#include <str_error.h>
#include <adt/list.h>
#include <libarch/ddi.h>

#include <usb/debug.h>
#include <usb/usb.h>
#include <usb/ddfiface.h>
#include <usb/usbdevice.h>

#include "hc.h"

static int interrupt_emulator(hc_t *instance);
static void hc_gain_control(hc_t *instance);
static void hc_init_hw(hc_t *instance);
/*----------------------------------------------------------------------------*/
int hc_register_hub(hc_t *instance, ddf_fun_t *hub_fun)
{
        assert(instance);
        assert(hub_fun);

        usb_address_t hub_address =
            device_keeper_get_free_address(&instance->manager, USB_SPEED_FULL);
        instance->rh.address = hub_address;
        usb_device_keeper_bind(
            &instance->manager, hub_address, hub_fun->handle);

        char *match_str = NULL;
        int ret = asprintf(&match_str, "usb&class=hub");
        ret = (match_str == NULL) ? ret : EOK;
        if (ret < 0) {
                usb_log_error("Failed to create root hub match-id string.\n");
                return ret;
        }

        ret = ddf_fun_add_match_id(hub_fun, match_str, 100);
        if (ret != EOK) {
                usb_log_error("Failed add create root hub match-id.\n");
        }
        return ret;
}
/*----------------------------------------------------------------------------*/
int hc_init(hc_t *instance, ddf_fun_t *fun, ddf_dev_t *dev,
    uintptr_t regs, size_t reg_size, bool interrupts)
{
        assert(instance);
        int ret = EOK;
#define CHECK_RET_RETURN(ret, message...) \
if (ret != EOK) { \
        usb_log_error(message); \
        return ret; \
} else (void)0

        ret = pio_enable((void*)regs, reg_size, (void**)&instance->registers);
        CHECK_RET_RETURN(ret,
            "Failed(%d) to gain access to device registers: %s.\n",
            ret, str_error(ret));

        instance->ddf_instance = fun;
        usb_device_keeper_init(&instance->manager);
        ret = usb_endpoint_manager_init(&instance->ep_manager,
            BANDWIDTH_AVAILABLE_USB11);
        CHECK_RET_RETURN(ret, "Failed to initialize endpoint manager: %s.\n",
            ret, str_error(ret));

        if (!interrupts) {
                instance->interrupt_emulator =
                    fibril_create((int(*)(void*))interrupt_emulator, instance);
                fibril_add_ready(instance->interrupt_emulator);
        }

        hc_gain_control(instance);

        rh_init(&instance->rh, dev, instance->registers);

        hc_init_hw(instance);

        /* TODO: implement */
        return EOK;
}
/*----------------------------------------------------------------------------*/
int hc_schedule(hc_t *instance, usb_transfer_batch_t *batch)
{
        assert(instance);
        assert(batch);
        if (batch->target.address == instance->rh.address) {
                return rh_request(&instance->rh, batch);
        }
        /* TODO: implement */
        return ENOTSUP;
}
/*----------------------------------------------------------------------------*/
void hc_interrupt(hc_t *instance, uint32_t status)
{
        assert(instance);
        if (status == 0)
                return;
        if (status & IS_RHSC)
                rh_interrupt(&instance->rh);

        usb_log_info("OHCI interrupt: %x.\n", status);

        /* TODO: Check for further interrupt causes */
        /* TODO: implement */
}
/*----------------------------------------------------------------------------*/
int interrupt_emulator(hc_t *instance)
{
        assert(instance);
        usb_log_info("Started interrupt emulator.\n");
        while (1) {
                const uint32_t status = instance->registers->interrupt_status;
                instance->registers->interrupt_status = status;
                hc_interrupt(instance, status);
                async_usleep(1000);
        }
        return EOK;
}
/*----------------------------------------------------------------------------*/
void hc_gain_control(hc_t *instance)
{
        assert(instance);
        /* Interrupt routing enabled => smm driver is active */
        if (instance->registers->control & C_IR) {
                usb_log_info("Found SMM driver requesting ownership change.\n");
                instance->registers->command_status |= CS_OCR;
                while (instance->registers->control & C_IR) {
                        async_usleep(1000);
                }
                usb_log_info("Ownership taken from SMM driver.\n");
                return;
        }

        const unsigned hc_status =
            (instance->registers->control >> C_HCFS_SHIFT) & C_HCFS_MASK;
        /* Interrupt routing disabled && status != USB_RESET => BIOS active */
        if (hc_status != C_HCFS_RESET) {
                usb_log_info("Found BIOS driver.\n");
                if (hc_status == C_HCFS_OPERATIONAL) {
                        usb_log_info("HC operational(BIOS).\n");
                        return;
                }
                /* HC is suspended assert resume for 20ms */
                instance->registers->control &= (C_HCFS_RESUME << C_HCFS_SHIFT);
                async_usleep(20000);
                return;
        }

        /* HC is in reset (hw startup) => no other driver
         * maintain reset for at least the time specified in USB spec (50 ms)*/
        async_usleep(50000);
}
/*----------------------------------------------------------------------------*/
void hc_init_hw(hc_t *instance)
{
        assert(instance);
        const uint32_t fm_interval = instance->registers->fm_interval;
        instance->registers->command_status = CS_HCR;
        async_usleep(10);
        instance->registers->fm_interval = fm_interval;
        assert((instance->registers->command_status & CS_HCR) == 0);
        /* hc is now in suspend state */
        /* TODO: init HCCA block */
        /* TODO: init queues */
        /* TODO: enable queues */
        /* TODO: enable interrupts */
        /* TODO: set periodic start to 90% */

        instance->registers->control &= (C_HCFS_OPERATIONAL << C_HCFS_SHIFT);
        usb_log_info("OHCI HC up and running.\n");
}
/**
 * @}
 */