source: mainline/uspace/drv/uhci-hcd/uhci.c@ a39cfb8

/*
 * 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 drvusbuhci
 * @{
 */
/** @file
 * @brief UHCI driver
 */
#include <errno.h>
#include <str_error.h>
#include <ddf/interrupt.h>
#include <usb_iface.h>
#include <usb/ddfiface.h>
#include <usb/debug.h>

#include "uhci.h"
#include "iface.h"
#include "pci.h"

/** IRQ handling callback, forward status from call to diver structure.
 *
 * @param[in] dev DDF instance of the device to use.
 * @param[in] iid (Unused).
 * @param[in] call Pointer to the call from kernel.
 */
static void irq_handler(ddf_dev_t *dev, ipc_callid_t iid, ipc_call_t *call)
{
        assert(dev);
        hc_t *hc = &((uhci_t*)dev->driver_data)->hc;
        uint16_t status = IPC_GET_ARG1(*call);
        assert(hc);
        hc_interrupt(hc, status);
}
/*----------------------------------------------------------------------------*/
/** Get address of the device identified by handle.
 *
 * @param[in] fun DDF instance of the function to use.
 * @param[in] handle DDF handle of the driver seeking its USB address.
 * @param[out] address Found address.
 */
static int usb_iface_get_address(
    ddf_fun_t *fun, devman_handle_t handle, usb_address_t *address)
{
        assert(fun);
        usb_device_keeper_t *manager =
            &((uhci_t*)fun->dev->driver_data)->hc.manager;

        usb_address_t addr = usb_device_keeper_find(manager, handle);
        if (addr < 0) {
                return addr;
        }

        if (address != NULL) {
                *address = addr;
        }

        return EOK;
}
/*----------------------------------------------------------------------------*/
/** Gets handle of the respective hc.
 *
 * @param[in] fun DDF function of uhci device.
 * @param[out] handle Host cotnroller handle.
 * @return Error code.
 */
static int usb_iface_get_hc_handle(
    ddf_fun_t *fun, devman_handle_t *handle)
{
        assert(handle);
        ddf_fun_t *hc_fun = ((uhci_t*)fun->dev->driver_data)->hc_fun;
        assert(hc_fun != NULL);

        *handle = hc_fun->handle;
        return EOK;
}
/*----------------------------------------------------------------------------*/
/** USB interface implementation used by RH */
static usb_iface_t usb_iface = {
        .get_hc_handle = usb_iface_get_hc_handle,
        .get_address = usb_iface_get_address
};
/*----------------------------------------------------------------------------*/
/** Operations supported by the HC driver */
static ddf_dev_ops_t hc_ops = {
        .interfaces[USBHC_DEV_IFACE] = &hc_iface, /* see iface.h/c */
};
/*----------------------------------------------------------------------------*/
/** Get root hub hw resources (I/O registers).
 *
 * @param[in] fun Root hub function.
 * @return Pointer to the resource list used by the root hub.
 */
static hw_resource_list_t *get_resource_list(ddf_fun_t *fun)
{
        assert(fun);
        return &((rh_t*)fun->driver_data)->resource_list;
}
/*----------------------------------------------------------------------------*/
/** Interface to provide the root hub driver with hw info */
static hw_res_ops_t hw_res_iface = {
        .get_resource_list = get_resource_list,
        .enable_interrupt = NULL
};
/*----------------------------------------------------------------------------*/
/** RH function support for uhci-rhd */
static ddf_dev_ops_t rh_ops = {
        .interfaces[USB_DEV_IFACE] = &usb_iface,
        .interfaces[HW_RES_DEV_IFACE] = &hw_res_iface
};
/*----------------------------------------------------------------------------*/
/** Initialize hc and rh DDF structures and their respective drivers.
 *
 * @param[in] instance UHCI structure to use.
 * @param[in] device DDF instance of the device to use.
 *
 * This function does all the preparatory work for hc and rh drivers:
 *  - gets device's hw resources
 *  - disables UHCI legacy support (PCI config space)
 *  - asks for interrupt
 *  - registers interrupt handler
 */
int uhci_init(uhci_t *instance, ddf_dev_t *device)
{
        assert(instance);
        instance->hc_fun = NULL;
        instance->rh_fun = NULL;
#define CHECK_RET_DEST_FUN_RETURN(ret, message...) \
if (ret != EOK) { \
        usb_log_error(message); \
        if (instance->hc_fun) \
                ddf_fun_destroy(instance->hc_fun); \
        if (instance->rh_fun) \
                ddf_fun_destroy(instance->rh_fun); \
        return ret; \
}

        uintptr_t io_reg_base = 0;
        size_t io_reg_size = 0;
        int irq = 0;

        int ret =
            pci_get_my_registers(device, &io_reg_base, &io_reg_size, &irq);
        CHECK_RET_DEST_FUN_RETURN(ret,
            "Failed(%d) to get I/O addresses:.\n", ret, device->handle);
        usb_log_debug("I/O regs at 0x%X (size %zu), IRQ %d.\n",
            io_reg_base, io_reg_size, irq);

        ret = pci_disable_legacy(device);
        CHECK_RET_DEST_FUN_RETURN(ret,
            "Failed(%d) to disable legacy USB: %s.\n", ret, str_error(ret));

        bool interrupts = false;
#ifdef CONFIG_USBHC_NO_INTERRUPTS
        usb_log_warning("Interrupts disabled in OS config, " \
            "falling back to polling.\n");
#else
        ret = pci_enable_interrupts(device);
        if (ret != EOK) {
                usb_log_warning("Failed to enable interrupts: %s.\n",
                    str_error(ret));
                usb_log_info("HW interrupts not available, " \
                    "falling back to polling.\n");
        } else {
                usb_log_debug("Hw interrupts enabled.\n");
                interrupts = true;
        }
#endif

        instance->hc_fun = ddf_fun_create(device, fun_exposed, "uhci-hc");
        ret = (instance->hc_fun == NULL) ? ENOMEM : EOK;
        CHECK_RET_DEST_FUN_RETURN(ret,
            "Failed(%d) to create HC function: %s.\n", ret, str_error(ret));

        ret = hc_init(&instance->hc, instance->hc_fun,
            (void*)io_reg_base, io_reg_size, interrupts);
        CHECK_RET_DEST_FUN_RETURN(ret,
            "Failed(%d) to init uhci-hcd: %s.\n", ret, str_error(ret));

        instance->hc_fun->ops = &hc_ops;
        instance->hc_fun->driver_data = &instance->hc;
        ret = ddf_fun_bind(instance->hc_fun);
        CHECK_RET_DEST_FUN_RETURN(ret,
            "Failed(%d) to bind UHCI device function: %s.\n",
            ret, str_error(ret));
#undef CHECK_RET_HC_RETURN

#define CHECK_RET_FINI_RETURN(ret, message...) \
if (ret != EOK) { \
        usb_log_error(message); \
        if (instance->hc_fun) \
                ddf_fun_destroy(instance->hc_fun); \
        if (instance->rh_fun) \
                ddf_fun_destroy(instance->rh_fun); \
        hc_fini(&instance->hc); \
        return ret; \
}

        /* It does no harm if we register this on polling */
        ret = register_interrupt_handler(device, irq, irq_handler,
            &instance->hc.interrupt_code);
        CHECK_RET_FINI_RETURN(ret,
            "Failed(%d) to register interrupt handler: %s.\n",
            ret, str_error(ret));

        instance->rh_fun = ddf_fun_create(device, fun_inner, "uhci-rh");
        ret = (instance->rh_fun == NULL) ? ENOMEM : EOK;
        CHECK_RET_FINI_RETURN(ret,
            "Failed(%d) to create root hub function: %s.\n",
            ret, str_error(ret));

        ret = rh_init(&instance->rh, instance->rh_fun,
            (uintptr_t)instance->hc.registers + 0x10, 4);
        CHECK_RET_FINI_RETURN(ret,
            "Failed(%d) to setup UHCI root hub: %s.\n", ret, str_error(ret));

        instance->rh_fun->ops = &rh_ops;
        instance->rh_fun->driver_data = &instance->rh;
        ret = ddf_fun_bind(instance->rh_fun);
        CHECK_RET_FINI_RETURN(ret,
            "Failed(%d) to register UHCI root hub: %s.\n", ret, str_error(ret));

        return EOK;
#undef CHECK_RET_FINI_RETURN
}
/**
 * @}
 */