hc.c

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/*
 * 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.
 */
#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 "hc.h"
#include "hcd_endpoint.h"

#define OHCI_USED_INTERRUPTS \
    (I_SO | I_WDH | I_UE | I_RHSC)
static int interrupt_emulator(hc_t *instance);
static void hc_gain_control(hc_t *instance);
static int hc_init_transfer_lists(hc_t *instance);
static int hc_init_memory(hc_t *instance);
/*----------------------------------------------------------------------------*/
int hc_register_hub(hc_t *instance, ddf_fun_t *hub_fun)
{
        assert(instance);
        assert(hub_fun);

        const usb_address_t hub_address =
            device_keeper_get_free_address(&instance->manager, USB_SPEED_FULL);
        if (hub_address <= 0) {
                usb_log_error("Failed(%d) to get OHCI root hub address.\n",
                    hub_address);
                return hub_address;
        }
        instance->rh.address = hub_address;
        usb_device_keeper_bind(
            &instance->manager, hub_address, hub_fun->handle);

#define CHECK_RET_RELEASE(ret, message...) \
if (ret != EOK) { \
        usb_log_error(message); \
        hc_remove_endpoint(instance, hub_address, 0, USB_DIRECTION_BOTH); \
        usb_device_keeper_release(&instance->manager, hub_address); \
        return ret; \
} else (void)0

        int ret = hc_add_endpoint(instance, hub_address, 0, USB_SPEED_FULL,
            USB_TRANSFER_CONTROL, USB_DIRECTION_BOTH, 64, 0, 0);
        CHECK_RET_RELEASE(ret, "Failed(%d) to add OHCI rh endpoint 0.\n", ret);

        char *match_str = NULL;
        /* DDF needs heap allocated string */
        ret = asprintf(&match_str, "usb&class=hub");
        ret = ret > 0 ? 0 : ret;
        CHECK_RET_RELEASE(ret, "Failed(%d) to create match-id string.\n", ret);

        ret = ddf_fun_add_match_id(hub_fun, match_str, 100);
        CHECK_RET_RELEASE(ret, "Failed(%d) add root hub match-id.\n", ret);

        ret = ddf_fun_bind(hub_fun);
        CHECK_RET_RELEASE(ret, "Failed(%d) to bind root hub function.\n", ret);

        return EOK;
#undef CHECK_RET_RELEASE
}
/*----------------------------------------------------------------------------*/
int hc_init(hc_t *instance, 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));

        list_initialize(&instance->pending_batches);
        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",
            str_error(ret));

        ret = hc_init_memory(instance);
        CHECK_RET_RETURN(ret, "Failed to create OHCI memory structures: %s.\n",
            str_error(ret));
#undef CHECK_RET_RETURN

        fibril_mutex_initialize(&instance->guard);
        hc_gain_control(instance);

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

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

        return EOK;
}
/*----------------------------------------------------------------------------*/
int hc_add_endpoint(
    hc_t *instance, usb_address_t address, usb_endpoint_t endpoint,
    usb_speed_t speed, usb_transfer_type_t type, usb_direction_t direction,
    size_t mps, size_t size, unsigned interval)
{
        endpoint_t *ep = malloc(sizeof(endpoint_t));
        if (ep == NULL)
                return ENOMEM;
        int ret =
            endpoint_init(ep, address, endpoint, direction, type, speed, mps);
        if (ret != EOK) {
                free(ep);
                return ret;
        }

        hcd_endpoint_t *hcd_ep = hcd_endpoint_assign(ep);
        if (hcd_ep == NULL) {
                endpoint_destroy(ep);
                return ENOMEM;
        }

        ret = usb_endpoint_manager_register_ep(&instance->ep_manager, ep, size);
        if (ret != EOK) {
                hcd_endpoint_clear(ep);
                endpoint_destroy(ep);
                return ret;
        }

        /* Enqueue hcd_ep */
        switch (ep->transfer_type) {
        case USB_TRANSFER_CONTROL:
                instance->registers->control &= ~C_CLE;
                endpoint_list_add_ep(
                    &instance->lists[ep->transfer_type], hcd_ep);
                instance->registers->control_current = 0;
                instance->registers->control |= C_CLE;
                break;
        case USB_TRANSFER_BULK:
                instance->registers->control &= ~C_BLE;
                endpoint_list_add_ep(
                    &instance->lists[ep->transfer_type], hcd_ep);
                instance->registers->control |= C_BLE;
                break;
        case USB_TRANSFER_ISOCHRONOUS:
        case USB_TRANSFER_INTERRUPT:
                instance->registers->control &= (~C_PLE & ~C_IE);
                endpoint_list_add_ep(
                    &instance->lists[ep->transfer_type], hcd_ep);
                instance->registers->control |= C_PLE | C_IE;
                break;
        default:
                break;
        }

        return EOK;
}
/*----------------------------------------------------------------------------*/
int hc_remove_endpoint(hc_t *instance, usb_address_t address,
    usb_endpoint_t endpoint, usb_direction_t direction)
{
        assert(instance);
        fibril_mutex_lock(&instance->guard);
        endpoint_t *ep = usb_endpoint_manager_get_ep(&instance->ep_manager,
            address, endpoint, direction, NULL);
        if (ep == NULL) {
                usb_log_error("Endpoint unregister failed: No such EP.\n");
                fibril_mutex_unlock(&instance->guard);
                return ENOENT;
        }

        hcd_endpoint_t *hcd_ep = hcd_endpoint_get(ep);
        if (hcd_ep) {
                /* Dequeue hcd_ep */
                switch (ep->transfer_type) {
                case USB_TRANSFER_CONTROL:
                        instance->registers->control &= ~C_CLE;
                        endpoint_list_remove_ep(
                            &instance->lists[ep->transfer_type], hcd_ep);
                        instance->registers->control_current = 0;
                        instance->registers->control |= C_CLE;
                        break;
                case USB_TRANSFER_BULK:
                        instance->registers->control &= ~C_BLE;
                        endpoint_list_remove_ep(
                            &instance->lists[ep->transfer_type], hcd_ep);
                        instance->registers->control |= C_BLE;
                        break;
                case USB_TRANSFER_ISOCHRONOUS:
                case USB_TRANSFER_INTERRUPT:
                        instance->registers->control &= (~C_PLE & ~C_IE);
                        endpoint_list_remove_ep(
                            &instance->lists[ep->transfer_type], hcd_ep);
                        instance->registers->control |= C_PLE | C_IE;
                        break;
                default:
                        break;
                }
                hcd_endpoint_clear(ep);
        } else {
                usb_log_warning("Endpoint without hcd equivalent structure.\n");
        }
        int ret = usb_endpoint_manager_unregister_ep(&instance->ep_manager,
            address, endpoint, direction);
        fibril_mutex_unlock(&instance->guard);
        return ret;
}
/*----------------------------------------------------------------------------*/
endpoint_t * hc_get_endpoint(hc_t *instance, usb_address_t address,
    usb_endpoint_t endpoint, usb_direction_t direction, size_t *bw)
{
        assert(instance);
        fibril_mutex_lock(&instance->guard);
        endpoint_t *ep = usb_endpoint_manager_get_ep(&instance->ep_manager,
            address, endpoint, direction, bw);
        fibril_mutex_unlock(&instance->guard);
        return ep;
}
/*----------------------------------------------------------------------------*/
int hc_schedule(hc_t *instance, usb_transfer_batch_t *batch)
{
        assert(instance);
        assert(batch);
        assert(batch->ep);

        /* Check for root hub communication */
        if (batch->ep->address == instance->rh.address) {
                return rh_request(&instance->rh, batch);
        }

        fibril_mutex_lock(&instance->guard);
        list_append(&batch->link, &instance->pending_batches);
        batch_commit(batch);

        /* Control and bulk schedules need a kick to start working */
        switch (batch->ep->transfer_type)
        {
        case USB_TRANSFER_CONTROL:
                instance->registers->command_status |= CS_CLF;
                break;
        case USB_TRANSFER_BULK:
                instance->registers->command_status |= CS_BLF;
                break;
        default:
                break;
        }
        fibril_mutex_unlock(&instance->guard);
        return EOK;
}
/*----------------------------------------------------------------------------*/
void hc_interrupt(hc_t *instance, uint32_t status)
{
        assert(instance);
        if ((status & ~I_SF) == 0) /* ignore sof status */
                return;
        usb_log_debug2("OHCI(%p) interrupt: %x.\n", instance, status);
        if (status & I_RHSC)
                rh_interrupt(&instance->rh);

        if (status & I_WDH) {
                fibril_mutex_lock(&instance->guard);
                usb_log_debug2("HCCA: %p-%#" PRIx32 " (%p).\n", instance->hcca,
                    instance->registers->hcca,
                    (void *) addr_to_phys(instance->hcca));
                usb_log_debug2("Periodic current: %#" PRIx32 ".\n",
                    instance->registers->periodic_current);

                link_t *current = instance->pending_batches.next;
                while (current != &instance->pending_batches) {
                        link_t *next = current->next;
                        usb_transfer_batch_t *batch =
                            usb_transfer_batch_from_link(current);

                        if (batch_is_complete(batch)) {
                                list_remove(current);
                                usb_transfer_batch_finish(batch);
                        }
                        current = next;
                }
                fibril_mutex_unlock(&instance->guard);
        }

        if (status & I_UE) {
                hc_start_hw(instance);
        }

}
/*----------------------------------------------------------------------------*/
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(10000);
        }
        return EOK;
}
/*----------------------------------------------------------------------------*/
void hc_gain_control(hc_t *instance)
{
        assert(instance);
        usb_log_debug("Requesting OHCI control.\n");
        /* Turn off legacy emulation */
        volatile uint32_t *ohci_emulation_reg =
            (uint32_t*)((char*)instance->registers + 0x100);
        usb_log_debug("OHCI legacy register %p: %x.\n",
            ohci_emulation_reg, *ohci_emulation_reg);
        /* Do not change A20 state */
        *ohci_emulation_reg &= 0x100;
        usb_log_debug("OHCI legacy register %p: %x.\n",
            ohci_emulation_reg, *ohci_emulation_reg);

        /* Interrupt routing enabled => smm driver is active */
        if (instance->registers->control & C_IR) {
                usb_log_debug("SMM driver: request ownership change.\n");
                instance->registers->command_status |= CS_OCR;
                while (instance->registers->control & C_IR) {
                        async_usleep(1000);
                }
                usb_log_info("SMM driver: Ownership taken.\n");
                instance->registers->control &= (C_HCFS_RESET << C_HCFS_SHIFT);
                async_usleep(50000);
                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_debug("BIOS driver found.\n");
                if (hc_status == C_HCFS_OPERATIONAL) {
                        usb_log_info("BIOS driver: HC operational.\n");
                        return;
                }
                /* HC is suspended assert resume for 20ms */
                instance->registers->control &= (C_HCFS_RESUME << C_HCFS_SHIFT);
                async_usleep(20000);
                usb_log_info("BIOS driver: HC resumed.\n");
                return;
        }

        /* HC is in reset (hw startup) => no other driver
         * maintain reset for at least the time specified in USB spec (50 ms)*/
        usb_log_info("HC found in reset.\n");
        async_usleep(50000);
}
/*----------------------------------------------------------------------------*/
void hc_start_hw(hc_t *instance)
{
        /* OHCI guide page 42 */
        assert(instance);
        usb_log_debug2("Started hc initialization routine.\n");

        /* Save contents of fm_interval register */
        const uint32_t fm_interval = instance->registers->fm_interval;
        usb_log_debug2("Old value of HcFmInterval: %x.\n", fm_interval);

        /* Reset hc */
        usb_log_debug2("HC reset.\n");
        size_t time = 0;
        instance->registers->command_status = CS_HCR;
        while (instance->registers->command_status & CS_HCR) {
                async_usleep(10);
                time += 10;
        }
        usb_log_debug2("HC reset complete in %zu us.\n", time);

        /* Restore fm_interval */
        instance->registers->fm_interval = fm_interval;
        assert((instance->registers->command_status & CS_HCR) == 0);

        /* hc is now in suspend state */
        usb_log_debug2("HC should be in suspend state(%x).\n",
            instance->registers->control);

        /* Use HCCA */
        instance->registers->hcca = addr_to_phys(instance->hcca);

        /* Use queues */
        instance->registers->bulk_head =
            instance->lists[USB_TRANSFER_BULK].list_head_pa;
        usb_log_debug2("Bulk HEAD set to: %p (%#" PRIx32 ").\n",
            instance->lists[USB_TRANSFER_BULK].list_head,
            instance->lists[USB_TRANSFER_BULK].list_head_pa);

        instance->registers->control_head =
            instance->lists[USB_TRANSFER_CONTROL].list_head_pa;
        usb_log_debug2("Control HEAD set to: %p (%#" PRIx32 ").\n",
            instance->lists[USB_TRANSFER_CONTROL].list_head,
            instance->lists[USB_TRANSFER_CONTROL].list_head_pa);

        /* Enable queues */
        instance->registers->control |= (C_PLE | C_IE | C_CLE | C_BLE);
        usb_log_debug2("All queues enabled(%x).\n",
            instance->registers->control);

        /* Enable interrupts */
        instance->registers->interrupt_enable = OHCI_USED_INTERRUPTS;
        usb_log_debug2("Enabled interrupts: %x.\n",
            instance->registers->interrupt_enable);
        instance->registers->interrupt_enable = I_MI;

        /* Set periodic start to 90% */
        uint32_t frame_length = ((fm_interval >> FMI_FI_SHIFT) & FMI_FI_MASK);
        instance->registers->periodic_start = (frame_length / 10) * 9;
        usb_log_debug2("All periodic start set to: %x(%u - 90%% of %d).\n",
            instance->registers->periodic_start,
            instance->registers->periodic_start, frame_length);

        instance->registers->control &= (C_HCFS_OPERATIONAL << C_HCFS_SHIFT);
        usb_log_info("OHCI HC up and running(%x).\n",
            instance->registers->control);
}
/*----------------------------------------------------------------------------*/
int hc_init_transfer_lists(hc_t *instance)
{
        assert(instance);
#define SETUP_ENDPOINT_LIST(type) \
do { \
        const char *name = usb_str_transfer_type(type); \
        int ret = endpoint_list_init(&instance->lists[type], name); \
        if (ret != EOK) { \
                usb_log_error("Failed(%d) to setup %s endpoint list.\n", \
                    ret, name); \
                endpoint_list_fini(&instance->lists[USB_TRANSFER_ISOCHRONOUS]);\
                endpoint_list_fini(&instance->lists[USB_TRANSFER_INTERRUPT]); \
                endpoint_list_fini(&instance->lists[USB_TRANSFER_CONTROL]); \
                endpoint_list_fini(&instance->lists[USB_TRANSFER_BULK]); \
                return ret; \
        } \
} while (0)

        SETUP_ENDPOINT_LIST(USB_TRANSFER_ISOCHRONOUS);
        SETUP_ENDPOINT_LIST(USB_TRANSFER_INTERRUPT);
        SETUP_ENDPOINT_LIST(USB_TRANSFER_CONTROL);
        SETUP_ENDPOINT_LIST(USB_TRANSFER_BULK);
#undef SETUP_ENDPOINT_LIST
        endpoint_list_set_next(&instance->lists[USB_TRANSFER_INTERRUPT],
            &instance->lists[USB_TRANSFER_ISOCHRONOUS]);

        return EOK;
}
/*----------------------------------------------------------------------------*/
int hc_init_memory(hc_t *instance)
{
        assert(instance);

        bzero(&instance->rh, sizeof(instance->rh));
        /* Init queues */
        const int ret = hc_init_transfer_lists(instance);
        if (ret != EOK) {
                return ret;
        }

        /*Init HCCA */
        instance->hcca = malloc32(sizeof(hcca_t));
        if (instance->hcca == NULL)
                return ENOMEM;
        bzero(instance->hcca, sizeof(hcca_t));
        usb_log_debug2("OHCI HCCA initialized at %p.\n", instance->hcca);

        unsigned i = 0;
        for (; i < 32; ++i) {
                instance->hcca->int_ep[i] =
                    instance->lists[USB_TRANSFER_INTERRUPT].list_head_pa;
        }
        usb_log_debug2("Interrupt HEADs set to: %p (%#" PRIx32 ").\n",
            instance->lists[USB_TRANSFER_INTERRUPT].list_head,
            instance->lists[USB_TRANSFER_INTERRUPT].list_head_pa);

        /* Init interrupt code */
        instance->interrupt_code.cmds = instance->interrupt_commands;
        instance->interrupt_code.cmdcount = OHCI_NEEDED_IRQ_COMMANDS;
        {
                /* Read status register */
                instance->interrupt_commands[0].cmd = CMD_MEM_READ_32;
                instance->interrupt_commands[0].dstarg = 1;
                instance->interrupt_commands[0].addr =
                    (void*)&instance->registers->interrupt_status;

                /* Test whether we are the interrupt cause */
                instance->interrupt_commands[1].cmd = CMD_BTEST;
                instance->interrupt_commands[1].value =
                    OHCI_USED_INTERRUPTS;
                instance->interrupt_commands[1].srcarg = 1;
                instance->interrupt_commands[1].dstarg = 2;

                /* Predicate cleaning and accepting */
                instance->interrupt_commands[2].cmd = CMD_PREDICATE;
                instance->interrupt_commands[2].value = 2;
                instance->interrupt_commands[2].srcarg = 2;

                /* Write-clean status register */
                instance->interrupt_commands[3].cmd = CMD_MEM_WRITE_A_32;
                instance->interrupt_commands[3].srcarg = 1;
                instance->interrupt_commands[3].addr =
                    (void*)&instance->registers->interrupt_status;

                /* Accept interrupt */
                instance->interrupt_commands[4].cmd = CMD_ACCEPT;
        }

        return EOK;
}

---