source: mainline/uspace/drv/bus/usb/uhci/pci.c@ f58ef61

/*
 * Copyright (c) 2011 Vojtech Horky
 * 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 drvusbuhcihc
 * @{
 */
/**
 * @file
 * PCI related functions needed by the UHCI driver.
 */

#include <errno.h>
#include <assert.h>
#include <devman.h>
#include <device/hw_res.h>

#include <usb/debug.h>
#include <pci_dev_iface.h>

#include "pci.h"

/** Get I/O address of registers and IRQ for given device.
 *
 * @param[in] dev Device asking for the addresses.
 * @param[out] io_reg_address Base address of the I/O range.
 * @param[out] io_reg_size Size of the I/O range.
 * @param[out] irq_no IRQ assigned to the device.
 * @return Error code.
 */
int pci_get_my_registers(const ddf_dev_t *dev,
    uintptr_t *io_reg_address, size_t *io_reg_size, int *irq_no)
{
        assert(dev);
        assert(io_reg_address);
        assert(io_reg_size);
        assert(irq_no);

        async_sess_t *parent_sess =
            devman_parent_device_connect(EXCHANGE_SERIALIZE, dev->handle,
            IPC_FLAG_BLOCKING);
        if (!parent_sess)
                return ENOMEM;

        hw_resource_list_t hw_resources;
        int rc = hw_res_get_resource_list(parent_sess, &hw_resources);
        if (rc != EOK) {
                async_hangup(parent_sess);
                return rc;
        }

        uintptr_t io_address = 0;
        size_t io_size = 0;
        bool io_found = false;
        
        int irq = 0;
        bool irq_found = false;
        
        size_t i;
        for (i = 0; i < hw_resources.count; i++) {
                const hw_resource_t *res = &hw_resources.resources[i];
                switch (res->type) {
                case INTERRUPT:
                        irq = res->res.interrupt.irq;
                        irq_found = true;
                        usb_log_debug2("Found interrupt: %d.\n", irq);
                        break;
                case IO_RANGE:
                        io_address = res->res.io_range.address;
                        io_size = res->res.io_range.size;
                        usb_log_debug2("Found io: %" PRIx64" %zu.\n",
                            res->res.io_range.address, res->res.io_range.size);
                        io_found = true;
                        break;
                default:
                        break;
                }
        }

        async_hangup(parent_sess);

        if (!io_found || !irq_found)
                return ENOENT;

        *io_reg_address = io_address;
        *io_reg_size = io_size;
        *irq_no = irq;

        return EOK;
}
/*----------------------------------------------------------------------------*/
/** Call the PCI driver with a request to enable interrupts
 *
 * @param[in] device Device asking for interrupts
 * @return Error code.
 */
int pci_enable_interrupts(const ddf_dev_t *device)
{
        async_sess_t *parent_sess =
            devman_parent_device_connect(EXCHANGE_SERIALIZE, device->handle,
            IPC_FLAG_BLOCKING);
        if (!parent_sess)
                return ENOMEM;

        const bool enabled = hw_res_enable_interrupt(parent_sess);
        async_hangup(parent_sess);

        return enabled ? EOK : EIO;
}
/*----------------------------------------------------------------------------*/
/** Call the PCI driver with a request to clear legacy support register
 *
 * @param[in] device Device asking to disable interrupts
 * @return Error code.
 */
int pci_disable_legacy(const ddf_dev_t *device)
{
        assert(device);

        async_sess_t *parent_sess =
            devman_parent_device_connect(EXCHANGE_SERIALIZE, device->handle,
            IPC_FLAG_BLOCKING);
        if (!parent_sess)
                return ENOMEM;

        /* See UHCI design guide for these values p.45,
         * write all WC bits in USB legacy register */
        const sysarg_t address = 0xc0;
        const sysarg_t value = 0xaf00;

        async_exch_t *exch = async_exchange_begin(parent_sess);

        const int rc = async_req_3_0(exch, DEV_IFACE_ID(PCI_DEV_IFACE),
            IPC_M_CONFIG_SPACE_WRITE_16, address, value);

        async_exchange_end(exch);
        async_hangup(parent_sess);

        return rc;
}

/**
 * @}
 */