source: mainline/uspace/drv/uhci-hcd/hc.c@ e247d83

/*
 * 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 drvusbuhcihc
 * @{
 */
/** @file
 * @brief UHCI 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_iface.h>

#include "hc.h"

#define UHCI_INTR_ALLOW_INTERRUPTS \
    (UHCI_INTR_CRC | UHCI_INTR_COMPLETE | UHCI_INTR_SHORT_PACKET)
#define UHCI_STATUS_USED_INTERRUPTS \
    (UHCI_STATUS_INTERRUPT | UHCI_STATUS_ERROR_INTERRUPT)


static int hc_init_transfer_lists(hc_t *instance);
static int hc_init_mem_structures(hc_t *instance);
static void hc_init_hw(hc_t *instance);

static int hc_interrupt_emulator(void *arg);
static int hc_debug_checker(void *arg);
/*----------------------------------------------------------------------------*/
/** Initialize UHCI hc driver structure
 *
 * @param[in] instance Memory place to initialize.
 * @param[in] regs Address of I/O control registers.
 * @param[in] reg_size Size of I/O control registers.
 * @param[in] interrupts True if hw interrupts should be used.
 * @return Error code.
 * @note Should be called only once on any structure.
 *
 * Initializes memory structures, starts up hw, and launches debugger and
 * interrupt fibrils.
 */
int hc_init(hc_t *instance, void *regs, size_t reg_size, bool interrupts)
{
        assert(reg_size >= sizeof(regs_t));
        int ret;

#define CHECK_RET_RETURN(ret, message...) \
        if (ret != EOK) { \
                usb_log_error(message); \
                return ret; \
        } else (void) 0

        instance->hw_interrupts = interrupts;
        instance->hw_failures = 0;

        /* allow access to hc control registers */
        regs_t *io;
        ret = pio_enable(regs, reg_size, (void **)&io);
        CHECK_RET_RETURN(ret,
            "Failed(%d) to gain access to registers at %p: %s.\n",
            ret, io, str_error(ret));
        instance->registers = io;
        usb_log_debug("Device registers at %p (%zuB) accessible.\n",
            io, reg_size);

        ret = hc_init_mem_structures(instance);
        CHECK_RET_RETURN(ret,
            "Failed(%d) to initialize UHCI memory structures: %s.\n",
            ret, str_error(ret));

        hc_init_hw(instance);
        if (!interrupts) {
                instance->interrupt_emulator =
                    fibril_create(hc_interrupt_emulator, instance);
                fibril_add_ready(instance->interrupt_emulator);
        }
        (void)hc_debug_checker;

        return EOK;
#undef CHECK_RET_DEST_FUN_RETURN
}
/*----------------------------------------------------------------------------*/
/** Initialize UHCI hc hw resources.
 *
 * @param[in] instance UHCI structure to use.
 * For magic values see UHCI Design Guide
 */
void hc_init_hw(hc_t *instance)
{
        assert(instance);
        regs_t *registers = instance->registers;

        /* Reset everything, who knows what touched it before us */
        pio_write_16(&registers->usbcmd, UHCI_CMD_GLOBAL_RESET);
        async_usleep(10000); /* 10ms according to USB spec */
        pio_write_16(&registers->usbcmd, 0);

        /* Reset hc, all states and counters */
        pio_write_16(&registers->usbcmd, UHCI_CMD_HCRESET);
        do { async_usleep(10); }
        while ((pio_read_16(&registers->usbcmd) & UHCI_CMD_HCRESET) != 0);

        /* Set frame to exactly 1ms */
        pio_write_8(&registers->sofmod, 64);

        /* Set frame list pointer */
        const uint32_t pa = addr_to_phys(instance->frame_list);
        pio_write_32(&registers->flbaseadd, pa);

        if (instance->hw_interrupts) {
                /* Enable all interrupts, but resume interrupt */
                pio_write_16(&instance->registers->usbintr,
                    UHCI_INTR_ALLOW_INTERRUPTS);
        }

        const uint16_t status = pio_read_16(&registers->usbcmd);
        if (status != 0)
                usb_log_warning("Previous command value: %x.\n", status);

        /* Start the hc with large(64B) packet FSBR */
        pio_write_16(&registers->usbcmd,
            UHCI_CMD_RUN_STOP | UHCI_CMD_MAX_PACKET | UHCI_CMD_CONFIGURE);
}
/*----------------------------------------------------------------------------*/
/** Initialize UHCI hc memory structures.
 *
 * @param[in] instance UHCI structure to use.
 * @return Error code
 * @note Should be called only once on any structure.
 *
 * Structures:
 *  - interrupt code (I/O addressses are customized per instance)
 *  - transfer lists (queue heads need to be accessible by the hw)
 *  - frame list page (needs to be one UHCI hw accessible 4K page)
 */
int hc_init_mem_structures(hc_t *instance)
{
        assert(instance);
#define CHECK_RET_RETURN(ret, message...) \
        if (ret != EOK) { \
                usb_log_error(message); \
                return ret; \
        } else (void) 0

        /* Init interrupt code */
        instance->interrupt_code.cmds = instance->interrupt_commands;
        {
                /* Read status register */
                instance->interrupt_commands[0].cmd = CMD_PIO_READ_16;
                instance->interrupt_commands[0].dstarg = 1;
                instance->interrupt_commands[0].addr =
                    &instance->registers->usbsts;

                /* Test whether we are the interrupt cause */
                instance->interrupt_commands[1].cmd = CMD_BTEST;
                instance->interrupt_commands[1].value =
                    UHCI_STATUS_USED_INTERRUPTS | UHCI_STATUS_NM_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_PIO_WRITE_A_16;
                instance->interrupt_commands[3].srcarg = 1;
                instance->interrupt_commands[3].addr =
                    &instance->registers->usbsts;

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

                instance->interrupt_code.cmdcount = UHCI_NEEDED_IRQ_COMMANDS;
        }

        /* Init transfer lists */
        int ret = hc_init_transfer_lists(instance);
        CHECK_RET_RETURN(ret, "Failed to init transfer lists.\n");
        usb_log_debug("Initialized transfer lists.\n");

        /* Init USB frame list page*/
        instance->frame_list = get_page();
        ret = instance->frame_list ? EOK : ENOMEM;
        CHECK_RET_RETURN(ret, "Failed to get frame list page.\n");
        usb_log_debug("Initialized frame list at %p.\n", instance->frame_list);

        /* Set all frames to point to the first queue head */
        const uint32_t queue = LINK_POINTER_QH(
                addr_to_phys(instance->transfers_interrupt.queue_head));

        unsigned i = 0;
        for(; i < UHCI_FRAME_LIST_COUNT; ++i) {
                instance->frame_list[i] = queue;
        }

        /* Init device keeper */
        usb_device_keeper_init(&instance->manager);
        usb_log_debug("Initialized device manager.\n");

        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));

        return EOK;
#undef CHECK_RET_RETURN
}
/*----------------------------------------------------------------------------*/
/** Initialize UHCI hc transfer lists.
 *
 * @param[in] instance UHCI structure to use.
 * @return Error code
 * @note Should be called only once on any structure.
 *
 * Initializes transfer lists and sets them in one chain to support proper
 * USB scheduling. Sets pointer table for quick access.
 */
int hc_init_transfer_lists(hc_t *instance)
{
        assert(instance);
#define SETUP_TRANSFER_LIST(type, name) \
do { \
        int ret = transfer_list_init(&instance->transfers_##type, name); \
        if (ret != EOK) { \
                usb_log_error("Failed(%d) to setup %s transfer list: %s.\n", \
                    ret, name, str_error(ret)); \
                transfer_list_fini(&instance->transfers_bulk_full); \
                transfer_list_fini(&instance->transfers_control_full); \
                transfer_list_fini(&instance->transfers_control_slow); \
                transfer_list_fini(&instance->transfers_interrupt); \
                return ret; \
        } \
} while (0)

        SETUP_TRANSFER_LIST(bulk_full, "BULK FULL");
        SETUP_TRANSFER_LIST(control_full, "CONTROL FULL");
        SETUP_TRANSFER_LIST(control_slow, "CONTROL LOW");
        SETUP_TRANSFER_LIST(interrupt, "INTERRUPT");
#undef SETUP_TRANSFER_LIST
        /* Connect lists into one schedule */
        transfer_list_set_next(&instance->transfers_control_full,
                &instance->transfers_bulk_full);
        transfer_list_set_next(&instance->transfers_control_slow,
                &instance->transfers_control_full);
        transfer_list_set_next(&instance->transfers_interrupt,
                &instance->transfers_control_slow);

        /*FSBR, This feature is not needed (adds no benefit) and is supposedly
         * buggy on certain hw, enable at your own risk. */
#ifdef FSBR
        transfer_list_set_next(&instance->transfers_bulk_full,
            &instance->transfers_control_full);
#endif

        /* Assign pointers to be used during scheduling */
        instance->transfers[USB_SPEED_FULL][USB_TRANSFER_INTERRUPT] =
          &instance->transfers_interrupt;
        instance->transfers[USB_SPEED_LOW][USB_TRANSFER_INTERRUPT] =
          &instance->transfers_interrupt;
        instance->transfers[USB_SPEED_FULL][USB_TRANSFER_CONTROL] =
          &instance->transfers_control_full;
        instance->transfers[USB_SPEED_LOW][USB_TRANSFER_CONTROL] =
          &instance->transfers_control_slow;
        instance->transfers[USB_SPEED_FULL][USB_TRANSFER_BULK] =
          &instance->transfers_bulk_full;

        return EOK;
#undef CHECK_RET_CLEAR_RETURN
}
/*----------------------------------------------------------------------------*/
/** Schedule batch for execution.
 *
 * @param[in] instance UHCI structure to use.
 * @param[in] batch Transfer batch to schedule.
 * @return Error code
 *
 * Checks for bandwidth availability and appends the batch to the proper queue.
 */
int hc_schedule(hc_t *instance, usb_transfer_batch_t *batch)
{
        assert(instance);
        assert(batch);

        transfer_list_t *list =
            instance->transfers[batch->ep->speed][batch->ep->transfer_type];
        assert(list);
        transfer_list_add_batch(list, batch);

        return EOK;
}
/*----------------------------------------------------------------------------*/
/** Take action based on the interrupt cause.
 *
 * @param[in] instance UHCI structure to use.
 * @param[in] status Value of the status register at the time of interrupt.
 *
 * Interrupt might indicate:
 * - transaction completed, either by triggering IOC, SPD, or an error
 * - some kind of device error
 * - resume from suspend state (not implemented)
 */
void hc_interrupt(hc_t *instance, uint16_t status)
{
        assert(instance);
        /* Lower 2 bits are transaction error and transaction complete */
        if (status & (UHCI_STATUS_INTERRUPT | UHCI_STATUS_ERROR_INTERRUPT)) {
                LIST_INITIALIZE(done);
                transfer_list_remove_finished(
                    &instance->transfers_interrupt, &done);
                transfer_list_remove_finished(
                    &instance->transfers_control_slow, &done);
                transfer_list_remove_finished(
                    &instance->transfers_control_full, &done);
                transfer_list_remove_finished(
                    &instance->transfers_bulk_full, &done);

                while (!list_empty(&done)) {
                        link_t *item = done.next;
                        list_remove(item);
                        usb_transfer_batch_t *batch =
                            list_get_instance(item, usb_transfer_batch_t, link);
                        usb_transfer_batch_finish(batch);
                }
        }
        /* Resume interrupts are not supported */
        if (status & UHCI_STATUS_RESUME) {
                usb_log_error("Resume interrupt!\n");
        }

        /* Bits 4 and 5 indicate hc error */
        if (status & (UHCI_STATUS_PROCESS_ERROR | UHCI_STATUS_SYSTEM_ERROR)) {
                usb_log_error("UHCI hardware failure!.\n");
                ++instance->hw_failures;
                transfer_list_abort_all(&instance->transfers_interrupt);
                transfer_list_abort_all(&instance->transfers_control_slow);
                transfer_list_abort_all(&instance->transfers_control_full);
                transfer_list_abort_all(&instance->transfers_bulk_full);

                if (instance->hw_failures < UHCI_ALLOWED_HW_FAIL) {
                        /* reinitialize hw, this triggers virtual disconnect*/
                        hc_init_hw(instance);
                } else {
                        usb_log_fatal("Too many UHCI hardware failures!.\n");
                        hc_fini(instance);
                }
        }
}
/*----------------------------------------------------------------------------*/
/** Polling function, emulates interrupts.
 *
 * @param[in] arg UHCI hc structure to use.
 * @return EOK (should never return)
 */
int hc_interrupt_emulator(void* arg)
{
        usb_log_debug("Started interrupt emulator.\n");
        hc_t *instance = arg;
        assert(instance);

        while (1) {
                /* Read and clear status register */
                uint16_t status = pio_read_16(&instance->registers->usbsts);
                pio_write_16(&instance->registers->usbsts, status);
                if (status != 0)
                        usb_log_debug2("UHCI status: %x.\n", status);
// Qemu fails to report stalled communication
// see https://bugs.launchpad.net/qemu/+bug/757654
// This is a simple workaround to force queue processing every time
        //      status |= 1;
                hc_interrupt(instance, status);
                async_usleep(UHCI_INT_EMULATOR_TIMEOUT);
        }
        return EOK;
}
/*---------------------------------------------------------------------------*/
/** Debug function, checks consistency of memory structures.
 *
 * @param[in] arg UHCI structure to use.
 * @return EOK (should never return)
 */
int hc_debug_checker(void *arg)
{
        hc_t *instance = arg;
        assert(instance);

#define QH(queue) \
        instance->transfers_##queue.queue_head

        while (1) {
                const uint16_t cmd = pio_read_16(&instance->registers->usbcmd);
                const uint16_t sts = pio_read_16(&instance->registers->usbsts);
                const uint16_t intr =
                    pio_read_16(&instance->registers->usbintr);

                if (((cmd & UHCI_CMD_RUN_STOP) != 1) || (sts != 0)) {
                        usb_log_debug2("Command: %X Status: %X Intr: %x\n",
                            cmd, sts, intr);
                }

                const uintptr_t frame_list =
                    pio_read_32(&instance->registers->flbaseadd) & ~0xfff;
                if (frame_list != addr_to_phys(instance->frame_list)) {
                        usb_log_debug("Framelist address: %p vs. %p.\n",
                            (void *) frame_list,
                            (void *) addr_to_phys(instance->frame_list));
                }

                int frnum = pio_read_16(&instance->registers->frnum) & 0x3ff;

                uintptr_t expected_pa = instance->frame_list[frnum]
                    & LINK_POINTER_ADDRESS_MASK;
                uintptr_t real_pa = addr_to_phys(QH(interrupt));
                if (expected_pa != real_pa) {
                        usb_log_debug("Interrupt QH: %p (frame %d) vs. %p.\n",
                            (void *) expected_pa, frnum, (void *) real_pa);
                }

                expected_pa = QH(interrupt)->next & LINK_POINTER_ADDRESS_MASK;
                real_pa = addr_to_phys(QH(control_slow));
                if (expected_pa != real_pa) {
                        usb_log_debug("Control Slow QH: %p vs. %p.\n",
                            (void *) expected_pa, (void *) real_pa);
                }

                expected_pa = QH(control_slow)->next & LINK_POINTER_ADDRESS_MASK;
                real_pa = addr_to_phys(QH(control_full));
                if (expected_pa != real_pa) {
                        usb_log_debug("Control Full QH: %p vs. %p.\n",
                            (void *) expected_pa, (void *) real_pa);
                }

                expected_pa = QH(control_full)->next & LINK_POINTER_ADDRESS_MASK;
                real_pa = addr_to_phys(QH(bulk_full));
                if (expected_pa != real_pa ) {
                        usb_log_debug("Bulk QH: %p vs. %p.\n",
                            (void *) expected_pa, (void *) real_pa);
                }
                async_usleep(UHCI_DEBUGER_TIMEOUT);
        }
        return EOK;
#undef QH
}
/**
 * @}
 */