source: mainline/uspace/drv/uhci-hcd/uhci_hc.c@ 17ceb72

/*
 * 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 "uhci_hc.h"

static irq_cmd_t uhci_cmds[] = {
        {
                .cmd = CMD_PIO_READ_16,
                .addr = NULL, /* patched for every instance */
                .dstarg = 1
        },
        {
                .cmd = CMD_PIO_WRITE_16,
                .addr = NULL, /* pathed for every instance */
                .value = 0x1f
        },
        {
                .cmd = CMD_ACCEPT
        }
};
/*----------------------------------------------------------------------------*/
static int uhci_hc_init_transfer_lists(uhci_hc_t *instance);
static int uhci_hc_init_mem_structures(uhci_hc_t *instance);
static void uhci_hc_init_hw(uhci_hc_t *instance);

static int uhci_hc_interrupt_emulator(void *arg);
static int uhci_hc_debug_checker(void *arg);

static bool allowed_usb_packet(
    bool low_speed, usb_transfer_type_t transfer, size_t size);
/*----------------------------------------------------------------------------*/
/** Initialize UHCI hcd driver structure
 *
 * @param[in] instance Memory place to initialize.
 * @param[in] fun DDF function.
 * @param[in] regs Address of I/O control registers.
 * @param[in] size Size of I/O control registers.
 * @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 uhci_hc_init(uhci_hc_t *instance, ddf_fun_t *fun, void *regs, size_t reg_size)
{
        assert(reg_size >= sizeof(regs_t));
        int ret;

#define CHECK_RET_DEST_FUN_RETURN(ret, message...) \
        if (ret != EOK) { \
                usb_log_error(message); \
                if (instance->ddf_instance) \
                        ddf_fun_destroy(instance->ddf_instance); \
                return ret; \
        } else (void) 0

        /* Setup UHCI function. */
        instance->ddf_instance = fun;

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

        ret = uhci_hc_init_mem_structures(instance);
        CHECK_RET_DEST_FUN_RETURN(ret,
            "Failed to initialize UHCI memory structures.\n");

        uhci_hc_init_hw(instance);
        instance->cleaner =
            fibril_create(uhci_hc_interrupt_emulator, instance);
        fibril_add_ready(instance->cleaner);

        instance->debug_checker = fibril_create(uhci_hc_debug_checker, instance);
        fibril_add_ready(instance->debug_checker);

        usb_log_info("Started UHCI driver.\n");
        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 uhci_hc_init_hw(uhci_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 framelist pointer */
        const uint32_t pa = addr_to_phys(instance->frame_list);
        pio_write_32(&registers->flbaseadd, pa);

        /* Enable all interrupts, but resume interrupt */
        pio_write_16(&instance->registers->usbintr,
            UHCI_INTR_CRC | UHCI_INTR_COMPLETE | UHCI_INTR_SHORT_PACKET);

        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 uhci_hc_init_mem_structures(uhci_hc_t *instance)
{
        assert(instance);
#define CHECK_RET_DEST_CMDS_RETURN(ret, message...) \
        if (ret != EOK) { \
                usb_log_error(message); \
                if (instance->interrupt_code.cmds != NULL) \
                        free(instance->interrupt_code.cmds); \
                return ret; \
        } else (void) 0

        /* Init interrupt code */
        instance->interrupt_code.cmds = malloc(sizeof(uhci_cmds));
        int ret = (instance->interrupt_code.cmds == NULL) ? ENOMEM : EOK;
        CHECK_RET_DEST_CMDS_RETURN(ret,
            "Failed to allocate interrupt cmds space.\n");

        {
                irq_cmd_t *interrupt_commands = instance->interrupt_code.cmds;
                memcpy(interrupt_commands, uhci_cmds, sizeof(uhci_cmds));
                interrupt_commands[0].addr =
                    (void*)&instance->registers->usbsts;
                interrupt_commands[1].addr =
                    (void*)&instance->registers->usbsts;
                instance->interrupt_code.cmdcount =
                    sizeof(uhci_cmds) / sizeof(irq_cmd_t);
        }

        /* Init transfer lists */
        ret = uhci_hc_init_transfer_lists(instance);
        CHECK_RET_DEST_CMDS_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 ? EOK : ENOMEM;
        CHECK_RET_DEST_CMDS_RETURN(ret, "Failed to get frame list page.\n");
        usb_log_debug("Initialized frame list.\n");

        /* Set all frames to point to the first queue head */
        const uint32_t queue =
          instance->transfers_interrupt.queue_head_pa
          | LINK_POINTER_QUEUE_HEAD_FLAG;

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

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

        return EOK;
#undef CHECK_RET_DEST_CMDS_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 uhci_hc_init_transfer_lists(uhci_hc_t *instance)
{
        assert(instance);
#define CHECK_RET_CLEAR_RETURN(ret, message...) \
        if (ret != EOK) { \
                usb_log_error(message); \
                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; \
        } else (void) 0

        /* initialize TODO: check errors */
        int ret;
        ret = transfer_list_init(&instance->transfers_bulk_full, "BULK_FULL");
        CHECK_RET_CLEAR_RETURN(ret, "Failed to init BULK list.");

        ret = transfer_list_init(
            &instance->transfers_control_full, "CONTROL_FULL");
        CHECK_RET_CLEAR_RETURN(ret, "Failed to init CONTROL FULL list.");

        ret = transfer_list_init(
            &instance->transfers_control_slow, "CONTROL_SLOW");
        CHECK_RET_CLEAR_RETURN(ret, "Failed to init CONTROL SLOW list.");

        ret = transfer_list_init(&instance->transfers_interrupt, "INTERRUPT");
        CHECK_RET_CLEAR_RETURN(ret, "Failed to init INTERRUPT list.");

        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*/
#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 uhci_hc_schedule(uhci_hc_t *instance, batch_t *batch)
{
        assert(instance);
        assert(batch);
        const int low_speed = (batch->speed == USB_SPEED_LOW);
        if (!allowed_usb_packet(
            low_speed, batch->transfer_type, batch->max_packet_size)) {
                usb_log_warning(
                    "Invalid USB packet specified %s SPEED %d %zu.\n",
                    low_speed ? "LOW" : "FULL" , batch->transfer_type,
                    batch->max_packet_size);
                return ENOTSUP;
        }
        /* TODO: check available bandwidth here */

        transfer_list_t *list =
            instance->transfers[batch->speed][batch->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 uhci_hc_interrupt(uhci_hc_t *instance, uint16_t status)
{
        assert(instance);
        /* TODO: Check interrupt cause here */
        /* Lower 2 bits are transaction error and transaction complete */
        if (status & 0x3) {
                transfer_list_remove_finished(&instance->transfers_interrupt);
                transfer_list_remove_finished(&instance->transfers_control_slow);
                transfer_list_remove_finished(&instance->transfers_control_full);
                transfer_list_remove_finished(&instance->transfers_bulk_full);
        }
}
/*----------------------------------------------------------------------------*/
/** Polling function, emulates interrupts.
 *
 * @param[in] arg UHCI hc structure to use.
 * @return EOK (should never return)
 */
int uhci_hc_interrupt_emulator(void* arg)
{
        usb_log_debug("Started interrupt emulator.\n");
        uhci_hc_t *instance = (uhci_hc_t*)arg;
        assert(instance);

        while (1) {
                /* read and ack interrupts */
                uint16_t status = pio_read_16(&instance->registers->usbsts);
                pio_write_16(&instance->registers->usbsts, 0x1f);
                if (status != 0)
                        usb_log_debug2("UHCI status: %x.\n", status);
                uhci_hc_interrupt(instance, status);
                async_usleep(UHCI_CLEANER_TIMEOUT);
        }
        return EOK;
}
/*---------------------------------------------------------------------------*/
/** Debug function, checks consistency of memory structures.
 *
 * @param[in] arg UHCI structure to use.
 * @return EOK (should never return)
 */
int uhci_hc_debug_checker(void *arg)
{
        uhci_hc_t *instance = (uhci_hc_t*)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);
                }

                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",
                            frame_list, 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",
                            expected_pa, frnum, 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",
                            expected_pa, 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",
                            expected_pa, 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",
                            expected_pa, real_pa);
                }
                async_usleep(UHCI_DEBUGER_TIMEOUT);
        }
        return EOK;
#undef QH
}
/*----------------------------------------------------------------------------*/
/** Check transfer packets, for USB validity
 *
 * @param[in] low_speed Transfer speed.
 * @param[in] transfer Transer type
 * @param[in] size Maximum size of used packets
 * @return True if transaction is allowed by USB specs, false otherwise
 */
bool allowed_usb_packet(
    bool low_speed, usb_transfer_type_t transfer, size_t size)
{
        /* see USB specification chapter 5.5-5.8 for magic numbers used here */
        switch(transfer)
        {
        case USB_TRANSFER_ISOCHRONOUS:
                return (!low_speed && size < 1024);
        case USB_TRANSFER_INTERRUPT:
                return size <= (low_speed ? 8 : 64);
        case USB_TRANSFER_CONTROL: /* device specifies its own max size */
                return (size <= (low_speed ? 8 : 64));
        case USB_TRANSFER_BULK: /* device specifies its own max size */
                return (!low_speed && size <= 64);
        }
        return false;
}
/**
 * @}
 */