/*
 * Inline routines shareable across OS platforms.
 *
 * Copyright (c) 1994-2001 Justin T. Gibbs.
 * Copyright (c) 2000-2003 Adaptec Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR 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 DAMAGES.
 *
 * $Id: //depot/aic7xxx/aic7xxx/aic79xx_inline.h#59 $
 *
 * $FreeBSD$
 */

#ifndef _AIC79XX_INLINE_H_
#define _AIC79XX_INLINE_H_

/******************************** Debugging ***********************************/
static __inline char *ahd_name(struct ahd_softc *ahd);

static __inline char *
ahd_name(struct ahd_softc *ahd)
{
        return (ahd->name);
}

/************************ Sequencer Execution Control *************************/
static __inline void ahd_known_modes(struct ahd_softc *ahd,
                                     ahd_mode src, ahd_mode dst);
static __inline ahd_mode_state ahd_build_mode_state(struct ahd_softc *ahd,
                                                    ahd_mode src,
                                                    ahd_mode dst);
static __inline void ahd_extract_mode_state(struct ahd_softc *ahd,
                                            ahd_mode_state state,
                                            ahd_mode *src, ahd_mode *dst);
static __inline void ahd_set_modes(struct ahd_softc *ahd, ahd_mode src,
                                   ahd_mode dst);
static __inline void ahd_update_modes(struct ahd_softc *ahd);
static __inline void ahd_assert_modes(struct ahd_softc *ahd, ahd_mode srcmode,
                                      ahd_mode dstmode, const char *file,
                                      int line);
static __inline ahd_mode_state ahd_save_modes(struct ahd_softc *ahd);
static __inline void ahd_restore_modes(struct ahd_softc *ahd,
                                       ahd_mode_state state);
static __inline int  ahd_is_paused(struct ahd_softc *ahd);
static __inline void ahd_pause(struct ahd_softc *ahd);
static __inline void ahd_unpause(struct ahd_softc *ahd);

static __inline void
ahd_known_modes(struct ahd_softc *ahd, ahd_mode src, ahd_mode dst)
{
        ahd->src_mode = src;
        ahd->dst_mode = dst;
        ahd->saved_src_mode = src;
        ahd->saved_dst_mode = dst;
}

static __inline ahd_mode_state
ahd_build_mode_state(struct ahd_softc *ahd, ahd_mode src, ahd_mode dst)
{
        return ((src << SRC_MODE_SHIFT) | (dst << DST_MODE_SHIFT));
}

static __inline void
ahd_extract_mode_state(struct ahd_softc *ahd, ahd_mode_state state,
                       ahd_mode *src, ahd_mode *dst)
{
        *src = (state & SRC_MODE) >> SRC_MODE_SHIFT;
        *dst = (state & DST_MODE) >> DST_MODE_SHIFT;
}

static __inline void
ahd_set_modes(struct ahd_softc *ahd, ahd_mode src, ahd_mode dst)
{
        if (ahd->src_mode == src && ahd->dst_mode == dst)
                return;
#ifdef AHD_DEBUG
        if (ahd->src_mode == AHD_MODE_UNKNOWN
         || ahd->dst_mode == AHD_MODE_UNKNOWN)
                panic("Setting mode prior to saving it.\n");
        if ((ahd_debug & AHD_SHOW_MODEPTR) != 0)
                printf("%s: Setting mode 0x%x\n", ahd_name(ahd),
                       ahd_build_mode_state(ahd, src, dst));
#endif
        ahd_outb(ahd, MODE_PTR, ahd_build_mode_state(ahd, src, dst));
        ahd->src_mode = src;
        ahd->dst_mode = dst;
}

static __inline void
ahd_update_modes(struct ahd_softc *ahd)
{
        ahd_mode_state mode_ptr;
        ahd_mode src;
        ahd_mode dst;

        mode_ptr = ahd_inb(ahd, MODE_PTR);
#ifdef AHD_DEBUG
        if ((ahd_debug & AHD_SHOW_MODEPTR) != 0)
                printf("Reading mode 0x%x\n", mode_ptr);
#endif
        ahd_extract_mode_state(ahd, mode_ptr, &src, &dst);
        ahd_known_modes(ahd, src, dst);
}

static __inline void
ahd_assert_modes(struct ahd_softc *ahd, ahd_mode srcmode,
                 ahd_mode dstmode, const char *file, int line)
{
#ifdef AHD_DEBUG
        if ((srcmode & AHD_MK_MSK(ahd->src_mode)) == 0
         || (dstmode & AHD_MK_MSK(ahd->dst_mode)) == 0) {
                panic("%s:%s:%d: Mode assertion failed.\n",
                       ahd_name(ahd), file, line);
        }
#endif
}

static __inline ahd_mode_state
ahd_save_modes(struct ahd_softc *ahd)
{
        if (ahd->src_mode == AHD_MODE_UNKNOWN
         || ahd->dst_mode == AHD_MODE_UNKNOWN)
                ahd_update_modes(ahd);

        return (ahd_build_mode_state(ahd, ahd->src_mode, ahd->dst_mode));
}

static __inline void
ahd_restore_modes(struct ahd_softc *ahd, ahd_mode_state state)
{
        ahd_mode src;
        ahd_mode dst;

        ahd_extract_mode_state(ahd, state, &src, &dst);
        ahd_set_modes(ahd, src, dst);
}

#define AHD_ASSERT_MODES(ahd, source, dest) \
        ahd_assert_modes(ahd, source, dest, __FILE__, __LINE__);

/*
 * Determine whether the sequencer has halted code execution.
 * Returns non-zero status if the sequencer is stopped.
 */
static __inline int
ahd_is_paused(struct ahd_softc *ahd)
{
        return ((ahd_inb(ahd, HCNTRL) & PAUSE) != 0);
}

/*
 * Request that the sequencer stop and wait, indefinitely, for it
 * to stop.  The sequencer will only acknowledge that it is paused
 * once it has reached an instruction boundary and PAUSEDIS is
 * cleared in the SEQCTL register.  The sequencer may use PAUSEDIS
 * for critical sections.
 */
static __inline void
ahd_pause(struct ahd_softc *ahd)
{
        ahd_outb(ahd, HCNTRL, ahd->pause);

        /*
         * Since the sequencer can disable pausing in a critical section, we
         * must loop until it actually stops.
         */
        while (ahd_is_paused(ahd) == 0)
                ;
}

/*
 * Allow the sequencer to continue program execution.
 * We check here to ensure that no additional interrupt
 * sources that would cause the sequencer to halt have been
 * asserted.  If, for example, a SCSI bus reset is detected
 * while we are fielding a different, pausing, interrupt type,
 * we don't want to release the sequencer before going back
 * into our interrupt handler and dealing with this new
 * condition.
 */
static __inline void
ahd_unpause(struct ahd_softc *ahd)
{
        /*
         * Automatically restore our modes to those saved
         * prior to the first change of the mode.
         */
        if (ahd->saved_src_mode != AHD_MODE_UNKNOWN
         && ahd->saved_dst_mode != AHD_MODE_UNKNOWN) {
                if ((ahd->flags & AHD_UPDATE_PEND_CMDS) != 0)
                        ahd_reset_cmds_pending(ahd);
                ahd_set_modes(ahd, ahd->saved_src_mode, ahd->saved_dst_mode);
        }

        if ((ahd_inb(ahd, INTSTAT) & ~CMDCMPLT) == 0)
                ahd_outb(ahd, HCNTRL, ahd->unpause);

        ahd_known_modes(ahd, AHD_MODE_UNKNOWN, AHD_MODE_UNKNOWN);
}

/*********************** Scatter Gather List Handling *************************/
static __inline void    *ahd_sg_setup(struct ahd_softc *ahd, struct scb *scb,
                                      void *sgptr, dma_addr_t addr,
                                      bus_size_t len, int last);
static __inline void     ahd_setup_scb_common(struct ahd_softc *ahd,
                                              struct scb *scb);
static __inline void     ahd_setup_data_scb(struct ahd_softc *ahd,
                                            struct scb *scb);
static __inline void     ahd_setup_noxfer_scb(struct ahd_softc *ahd,
                                              struct scb *scb);

static __inline void *
ahd_sg_setup(struct ahd_softc *ahd, struct scb *scb,
             void *sgptr, dma_addr_t addr, bus_size_t len, int last)
{
        scb->sg_count++;
        if (sizeof(dma_addr_t) > 4
         && (ahd->flags & AHD_64BIT_ADDRESSING) != 0) {
                struct ahd_dma64_seg *sg;

                sg = (struct ahd_dma64_seg *)sgptr;
                sg->addr = ahd_htole64(addr);
                sg->len = ahd_htole32(len | (last ? AHD_DMA_LAST_SEG : 0));
                return (sg + 1);
        } else {
                struct ahd_dma_seg *sg;

                sg = (struct ahd_dma_seg *)sgptr;
                sg->addr = ahd_htole32(addr & 0xFFFFFFFF);
                sg->len = ahd_htole32(len | ((addr >> 8) & 0x7F000000)
                                    | (last ? AHD_DMA_LAST_SEG : 0));
                return (sg + 1);
        }
}

static __inline void
ahd_setup_scb_common(struct ahd_softc *ahd, struct scb *scb)
{
        /* XXX Handle target mode SCBs. */
        scb->crc_retry_count = 0;
        if ((scb->flags & SCB_PACKETIZED) != 0) {
                /* XXX what about ACA??  It is type 4, but TAG_TYPE == 0x3. */
                scb->hscb->task_attribute = scb->hscb->control & SCB_TAG_TYPE;
        } else {
                if (ahd_get_transfer_length(scb) & 0x01)
                        scb->hscb->task_attribute = SCB_XFERLEN_ODD;
                else
                        scb->hscb->task_attribute = 0;
        }

        if (scb->hscb->cdb_len <= MAX_CDB_LEN_WITH_SENSE_ADDR
         || (scb->hscb->cdb_len & SCB_CDB_LEN_PTR) != 0)
                scb->hscb->shared_data.idata.cdb_plus_saddr.sense_addr =
                    ahd_htole32(scb->sense_busaddr);
}

static __inline void
ahd_setup_data_scb(struct ahd_softc *ahd, struct scb *scb)
{
        /*
         * Copy the first SG into the "current" data ponter area.
         */
        if ((ahd->flags & AHD_64BIT_ADDRESSING) != 0) {
                struct ahd_dma64_seg *sg;

                sg = (struct ahd_dma64_seg *)scb->sg_list;
                scb->hscb->dataptr = sg->addr;
                scb->hscb->datacnt = sg->len;
        } else {
                struct ahd_dma_seg *sg;
                uint32_t *dataptr_words;

                sg = (struct ahd_dma_seg *)scb->sg_list;
                dataptr_words = (uint32_t*)&scb->hscb->dataptr;
                dataptr_words[0] = sg->addr;
                dataptr_words[1] = 0;
                if ((ahd->flags & AHD_39BIT_ADDRESSING) != 0) {
                        uint64_t high_addr;

                        high_addr = ahd_le32toh(sg->len) & 0x7F000000;
                        scb->hscb->dataptr |= ahd_htole64(high_addr << 8);
                }
                scb->hscb->datacnt = sg->len;
        }
        /*
         * Note where to find the SG entries in bus space.
         * We also set the full residual flag which the 
         * sequencer will clear as soon as a data transfer
         * occurs.
         */
        scb->hscb->sgptr = ahd_htole32(scb->sg_list_busaddr|SG_FULL_RESID);
}

static __inline void
ahd_setup_noxfer_scb(struct ahd_softc *ahd, struct scb *scb)
{
        scb->hscb->sgptr = ahd_htole32(SG_LIST_NULL);
        scb->hscb->dataptr = 0;
        scb->hscb->datacnt = 0;
}

/************************** Memory mapping routines ***************************/
static __inline size_t  ahd_sg_size(struct ahd_softc *ahd);
static __inline void *
                        ahd_sg_bus_to_virt(struct ahd_softc *ahd,
                                           struct scb *scb,
                                           uint32_t sg_busaddr);
static __inline uint32_t
                        ahd_sg_virt_to_bus(struct ahd_softc *ahd,
                                           struct scb *scb,
                                           void *sg);
static __inline void    ahd_sync_scb(struct ahd_softc *ahd,
                                     struct scb *scb, int op);
static __inline void    ahd_sync_sglist(struct ahd_softc *ahd,
                                        struct scb *scb, int op);
static __inline void    ahd_sync_sense(struct ahd_softc *ahd,
                                       struct scb *scb, int op);
static __inline uint32_t
                        ahd_targetcmd_offset(struct ahd_softc *ahd,
                                             u_int index);

static __inline size_t
ahd_sg_size(struct ahd_softc *ahd)
{
        if ((ahd->flags & AHD_64BIT_ADDRESSING) != 0)
                return (sizeof(struct ahd_dma64_seg));
        return (sizeof(struct ahd_dma_seg));
}

static __inline void *
ahd_sg_bus_to_virt(struct ahd_softc *ahd, struct scb *scb, uint32_t sg_busaddr)
{
        dma_addr_t sg_offset;

        /* sg_list_phys points to entry 1, not 0 */
        sg_offset = sg_busaddr - (scb->sg_list_busaddr - ahd_sg_size(ahd));
        return ((uint8_t *)scb->sg_list + sg_offset);
}

static __inline uint32_t
ahd_sg_virt_to_bus(struct ahd_softc *ahd, struct scb *scb, void *sg)
{
        dma_addr_t sg_offset;

        /* sg_list_phys points to entry 1, not 0 */
        sg_offset = ((uint8_t *)sg - (uint8_t *)scb->sg_list)
                  - ahd_sg_size(ahd);

        return (scb->sg_list_busaddr + sg_offset);
}

static __inline void
ahd_sync_scb(struct ahd_softc *ahd, struct scb *scb, int op)
{
        ahd_dmamap_sync(ahd, ahd->scb_data.hscb_dmat,
                        scb->hscb_map->dmamap,
                        /*offset*/(uint8_t*)scb->hscb - scb->hscb_map->vaddr,
                        /*len*/sizeof(*scb->hscb), op);
}

static __inline void
ahd_sync_sglist(struct ahd_softc *ahd, struct scb *scb, int op)
{
        if (scb->sg_count == 0)
                return;

        ahd_dmamap_sync(ahd, ahd->scb_data.sg_dmat,
                        scb->sg_map->dmamap,
                        /*offset*/scb->sg_list_busaddr - ahd_sg_size(ahd),
                        /*len*/ahd_sg_size(ahd) * scb->sg_count, op);
}

static __inline void
ahd_sync_sense(struct ahd_softc *ahd, struct scb *scb, int op)
{
        ahd_dmamap_sync(ahd, ahd->scb_data.sense_dmat,
                        scb->sense_map->dmamap,
                        /*offset*/scb->sense_busaddr,
                        /*len*/AHD_SENSE_BUFSIZE, op);
}

static __inline uint32_t
ahd_targetcmd_offset(struct ahd_softc *ahd, u_int index)
{
        return (((uint8_t *)&ahd->targetcmds[index])
               - (uint8_t *)ahd->qoutfifo);
}

/*********************** Miscelaneous Support Functions ***********************/
static __inline struct ahd_initiator_tinfo *
                        ahd_fetch_transinfo(struct ahd_softc *ahd,
                                            char channel, u_int our_id,
                                            u_int remote_id,
                                            struct ahd_tmode_tstate **tstate);
static __inline uint16_t
                        ahd_inw(struct ahd_softc *ahd, u_int port);
static __inline void    ahd_outw(struct ahd_softc *ahd, u_int port,
                                 u_int value);
static __inline uint32_t
                        ahd_inl(struct ahd_softc *ahd, u_int port);
static __inline void    ahd_outl(struct ahd_softc *ahd, u_int port,
                                 uint32_t value);
static __inline uint64_t
                        ahd_inq(struct ahd_softc *ahd, u_int port);
static __inline void    ahd_outq(struct ahd_softc *ahd, u_int port,
                                 uint64_t value);
static __inline u_int   ahd_get_scbptr(struct ahd_softc *ahd);
static __inline void    ahd_set_scbptr(struct ahd_softc *ahd, u_int scbptr);
static __inline u_int   ahd_get_hnscb_qoff(struct ahd_softc *ahd);
static __inline void    ahd_set_hnscb_qoff(struct ahd_softc *ahd, u_int value);
static __inline u_int   ahd_get_hescb_qoff(struct ahd_softc *ahd);
static __inline void    ahd_set_hescb_qoff(struct ahd_softc *ahd, u_int value);
static __inline u_int   ahd_get_snscb_qoff(struct ahd_softc *ahd);
static __inline void    ahd_set_snscb_qoff(struct ahd_softc *ahd, u_int value);
static __inline u_int   ahd_get_sescb_qoff(struct ahd_softc *ahd);
static __inline void    ahd_set_sescb_qoff(struct ahd_softc *ahd, u_int value);
static __inline u_int   ahd_get_sdscb_qoff(struct ahd_softc *ahd);
static __inline void    ahd_set_sdscb_qoff(struct ahd_softc *ahd, u_int value);
static __inline u_int   ahd_inb_scbram(struct ahd_softc *ahd, u_int offset);
static __inline u_int   ahd_inw_scbram(struct ahd_softc *ahd, u_int offset);
static __inline uint32_t
                        ahd_inl_scbram(struct ahd_softc *ahd, u_int offset);
static __inline uint64_t
                        ahd_inq_scbram(struct ahd_softc *ahd, u_int offset);
static __inline void    ahd_swap_with_next_hscb(struct ahd_softc *ahd,
                                                struct scb *scb);
static __inline void    ahd_queue_scb(struct ahd_softc *ahd, struct scb *scb);
static __inline uint8_t *
                        ahd_get_sense_buf(struct ahd_softc *ahd,
                                          struct scb *scb);
static __inline uint32_t
                        ahd_get_sense_bufaddr(struct ahd_softc *ahd,
                                              struct scb *scb);

/*
 * Return pointers to the transfer negotiation information
 * for the specified our_id/remote_id pair.
 */
static __inline struct ahd_initiator_tinfo *
ahd_fetch_transinfo(struct ahd_softc *ahd, char channel, u_int our_id,
                    u_int remote_id, struct ahd_tmode_tstate **tstate)
{
        /*
         * Transfer data structures are stored from the perspective
         * of the target role.  Since the parameters for a connection
         * in the initiator role to a given target are the same as
         * when the roles are reversed, we pretend we are the target.
         */
        if (channel == 'B')
                our_id += 8;
        *tstate = ahd->enabled_targets[our_id];
        return (&(*tstate)->transinfo[remote_id]);
}

#define AHD_COPY_COL_IDX(dst, src)                              \
do {                                                            \
        dst->hscb->scsiid = src->hscb->scsiid;                  \
        dst->hscb->lun = src->hscb->lun;                        \
} while (0)

static __inline uint16_t
ahd_inw(struct ahd_softc *ahd, u_int port)
{
        /*
         * Read high byte first as some registers increment
         * or have other side effects when the low byte is
         * read.
         */
        uint16_t r = ahd_inb(ahd, port+1) << 8;
        return r | ahd_inb(ahd, port);
}

static __inline void
ahd_outw(struct ahd_softc *ahd, u_int port, u_int value)
{
        /*
         * Write low byte first to accomodate registers
         * such as PRGMCNT where the order maters.
         */
        ahd_outb(ahd, port, value & 0xFF);
        ahd_outb(ahd, port+1, (value >> 8) & 0xFF);
}

static __inline uint32_t
ahd_inl(struct ahd_softc *ahd, u_int port)
{
        return ((ahd_inb(ahd, port))
              | (ahd_inb(ahd, port+1) << 8)
              | (ahd_inb(ahd, port+2) << 16)
              | (ahd_inb(ahd, port+3) << 24));
}

static __inline void
ahd_outl(struct ahd_softc *ahd, u_int port, uint32_t value)
{
        ahd_outb(ahd, port, (value) & 0xFF);
        ahd_outb(ahd, port+1, ((value) >> 8) & 0xFF);
        ahd_outb(ahd, port+2, ((value) >> 16) & 0xFF);
        ahd_outb(ahd, port+3, ((value) >> 24) & 0xFF);
}

static __inline uint64_t
ahd_inq(struct ahd_softc *ahd, u_int port)
{
        return ((ahd_inb(ahd, port))
              | (ahd_inb(ahd, port+1) << 8)
              | (ahd_inb(ahd, port+2) << 16)
              | (ahd_inb(ahd, port+3) << 24)
              | (((uint64_t)ahd_inb(ahd, port+4)) << 32)
              | (((uint64_t)ahd_inb(ahd, port+5)) << 40)
              | (((uint64_t)ahd_inb(ahd, port+6)) << 48)
              | (((uint64_t)ahd_inb(ahd, port+7)) << 56));
}

static __inline void
ahd_outq(struct ahd_softc *ahd, u_int port, uint64_t value)
{
        ahd_outb(ahd, port, value & 0xFF);
        ahd_outb(ahd, port+1, (value >> 8) & 0xFF);
        ahd_outb(ahd, port+2, (value >> 16) & 0xFF);
        ahd_outb(ahd, port+3, (value >> 24) & 0xFF);
        ahd_outb(ahd, port+4, (value >> 32) & 0xFF);
        ahd_outb(ahd, port+5, (value >> 40) & 0xFF);
        ahd_outb(ahd, port+6, (value >> 48) & 0xFF);
        ahd_outb(ahd, port+7, (value >> 56) & 0xFF);
}

static __inline u_int
ahd_get_scbptr(struct ahd_softc *ahd)
{
        AHD_ASSERT_MODES(ahd, ~(AHD_MODE_UNKNOWN_MSK|AHD_MODE_CFG_MSK),
                         ~(AHD_MODE_UNKNOWN_MSK|AHD_MODE_CFG_MSK));
        return (ahd_inb(ahd, SCBPTR) | (ahd_inb(ahd, SCBPTR + 1) << 8));
}

static __inline void
ahd_set_scbptr(struct ahd_softc *ahd, u_int scbptr)
{
        AHD_ASSERT_MODES(ahd, ~(AHD_MODE_UNKNOWN_MSK|AHD_MODE_CFG_MSK),
                         ~(AHD_MODE_UNKNOWN_MSK|AHD_MODE_CFG_MSK));
        ahd_outb(ahd, SCBPTR, scbptr & 0xFF);
        ahd_outb(ahd, SCBPTR+1, (scbptr >> 8) & 0xFF);
}

static __inline u_int
ahd_get_hnscb_qoff(struct ahd_softc *ahd)
{
        return (ahd_inw_atomic(ahd, HNSCB_QOFF));
}

static __inline void
ahd_set_hnscb_qoff(struct ahd_softc *ahd, u_int value)
{
        ahd_outw_atomic(ahd, HNSCB_QOFF, value);
}

static __inline u_int
ahd_get_hescb_qoff(struct ahd_softc *ahd)
{
        return (ahd_inb(ahd, HESCB_QOFF));
}

static __inline void
ahd_set_hescb_qoff(struct ahd_softc *ahd, u_int value)
{
        ahd_outb(ahd, HESCB_QOFF, value);
}

static __inline u_int
ahd_get_snscb_qoff(struct ahd_softc *ahd)
{
        u_int oldvalue;

        AHD_ASSERT_MODES(ahd, AHD_MODE_CCHAN_MSK, AHD_MODE_CCHAN_MSK);
        oldvalue = ahd_inw(ahd, SNSCB_QOFF);
        ahd_outw(ahd, SNSCB_QOFF, oldvalue);
        return (oldvalue);
}

static __inline void
ahd_set_snscb_qoff(struct ahd_softc *ahd, u_int value)
{
        AHD_ASSERT_MODES(ahd, AHD_MODE_CCHAN_MSK, AHD_MODE_CCHAN_MSK);
        ahd_outw(ahd, SNSCB_QOFF, value);
}

static __inline u_int
ahd_get_sescb_qoff(struct ahd_softc *ahd)
{
        AHD_ASSERT_MODES(ahd, AHD_MODE_CCHAN_MSK, AHD_MODE_CCHAN_MSK);
        return (ahd_inb(ahd, SESCB_QOFF));
}

static __inline void
ahd_set_sescb_qoff(struct ahd_softc *ahd, u_int value)
{
        AHD_ASSERT_MODES(ahd, AHD_MODE_CCHAN_MSK, AHD_MODE_CCHAN_MSK);
        ahd_outb(ahd, SESCB_QOFF, value);
}

static __inline u_int
ahd_get_sdscb_qoff(struct ahd_softc *ahd)
{
        AHD_ASSERT_MODES(ahd, AHD_MODE_CCHAN_MSK, AHD_MODE_CCHAN_MSK);
        return (ahd_inb(ahd, SDSCB_QOFF) | (ahd_inb(ahd, SDSCB_QOFF + 1) << 8));
}

static __inline void
ahd_set_sdscb_qoff(struct ahd_softc *ahd, u_int value)
{
        AHD_ASSERT_MODES(ahd, AHD_MODE_CCHAN_MSK, AHD_MODE_CCHAN_MSK);
        ahd_outb(ahd, SDSCB_QOFF, value & 0xFF);
        ahd_outb(ahd, SDSCB_QOFF+1, (value >> 8) & 0xFF);
}

static __inline u_int
ahd_inb_scbram(struct ahd_softc *ahd, u_int offset)
{
        u_int value;

        /*
         * Workaround PCI-X Rev A. hardware bug.
         * After a host read of SCB memory, the chip
         * may become confused into thinking prefetch
         * was required.  This starts the discard timer
         * running and can cause an unexpected discard
         * timer interrupt.  The work around is to read
         * a normal register prior to the exhaustion of
         * the discard timer.  The mode pointer register
         * has no side effects and so serves well for
         * this purpose.
         *
         * Razor #528
         */
        value = ahd_inb(ahd, offset);
        if ((ahd->bugs & AHD_PCIX_SCBRAM_RD_BUG) != 0)
                ahd_inb(ahd, MODE_PTR);
        return (value);
}

static __inline u_int
ahd_inw_scbram(struct ahd_softc *ahd, u_int offset)
{
        return (ahd_inb_scbram(ahd, offset)
              | (ahd_inb_scbram(ahd, offset+1) << 8));
}

static __inline uint32_t
ahd_inl_scbram(struct ahd_softc *ahd, u_int offset)
{
        return (ahd_inw_scbram(ahd, offset)
              | (ahd_inw_scbram(ahd, offset+2) << 16));
}

static __inline uint64_t
ahd_inq_scbram(struct ahd_softc *ahd, u_int offset)
{
        return (ahd_inl_scbram(ahd, offset)
              | ((uint64_t)ahd_inl_scbram(ahd, offset+4)) << 32);
}

static __inline struct scb *
ahd_lookup_scb(struct ahd_softc *ahd, u_int tag)
{
        struct scb* scb;

        if (tag >= AHD_SCB_MAX)
                return (NULL);
        scb = ahd->scb_data.scbindex[tag];
        if (scb != NULL)
                ahd_sync_scb(ahd, scb,
                             BUS_DMASYNC_POSTREAD|BUS_DMASYNC_POSTWRITE);
        return (scb);
}

static __inline void
ahd_swap_with_next_hscb(struct ahd_softc *ahd, struct scb *scb)
{
        struct   hardware_scb *q_hscb;
        struct   map_node *q_hscb_map;
        uint32_t saved_hscb_busaddr;

        /*
         * Our queuing method is a bit tricky.  The card
         * knows in advance which HSCB (by address) to download,
         * and we can't disappoint it.  To achieve this, the next
         * HSCB to download is saved off in ahd->next_queued_hscb.
         * When we are called to queue "an arbitrary scb",
         * we copy the contents of the incoming HSCB to the one
         * the sequencer knows about, swap HSCB pointers and
         * finally assign the SCB to the tag indexed location
         * in the scb_array.  This makes sure that we can still
         * locate the correct SCB by SCB_TAG.
         */
        q_hscb = ahd->next_queued_hscb;
        q_hscb_map = ahd->next_queued_hscb_map;
        saved_hscb_busaddr = q_hscb->hscb_busaddr;
        memcpy(q_hscb, scb->hscb, sizeof(*scb->hscb));
        q_hscb->hscb_busaddr = saved_hscb_busaddr;
        q_hscb->next_hscb_busaddr = scb->hscb->hscb_busaddr;

        /* Now swap HSCB pointers. */
        ahd->next_queued_hscb = scb->hscb;
        ahd->next_queued_hscb_map = scb->hscb_map;
        scb->hscb = q_hscb;
        scb->hscb_map = q_hscb_map;

        /* Now define the mapping from tag to SCB in the scbindex */
        ahd->scb_data.scbindex[SCB_GET_TAG(scb)] = scb;
}

/*
 * Tell the sequencer about a new transaction to execute.
 */
static __inline void
ahd_queue_scb(struct ahd_softc *ahd, struct scb *scb)
{
        ahd_swap_with_next_hscb(ahd, scb);

        if (SCBID_IS_NULL(SCB_GET_TAG(scb)))
                panic("Attempt to queue invalid SCB tag %x\n",
                      SCB_GET_TAG(scb));

        /*
         * Keep a history of SCBs we've downloaded in the qinfifo.
         */
        ahd->qinfifo[AHD_QIN_WRAP(ahd->qinfifonext)] = SCB_GET_TAG(scb);
        ahd->qinfifonext++;

        if (scb->sg_count != 0)
                ahd_setup_data_scb(ahd, scb);
        else
                ahd_setup_noxfer_scb(ahd, scb);
        ahd_setup_scb_common(ahd, scb);

        /*
         * Make sure our data is consistent from the
         * perspective of the adapter.
         */
        ahd_sync_scb(ahd, scb, BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE);

#ifdef AHD_DEBUG
        if ((ahd_debug & AHD_SHOW_QUEUE) != 0) {
                uint64_t host_dataptr;

                host_dataptr = ahd_le64toh(scb->hscb->dataptr);
                printf("%s: Queueing SCB %d:0x%x bus addr 0x%x - 0x%x%x/0x%x\n",
                       ahd_name(ahd),
                       SCB_GET_TAG(scb), scb->hscb->scsiid,
                       ahd_le32toh(scb->hscb->hscb_busaddr),
                       (u_int)((host_dataptr >> 32) & 0xFFFFFFFF),
                       (u_int)(host_dataptr & 0xFFFFFFFF),
                       ahd_le32toh(scb->hscb->datacnt));
        }
#endif
        /* Tell the adapter about the newly queued SCB */
        ahd_set_hnscb_qoff(ahd, ahd->qinfifonext);
}

static __inline uint8_t *
ahd_get_sense_buf(struct ahd_softc *ahd, struct scb *scb)
{
        return (scb->sense_data);
}

static __inline uint32_t
ahd_get_sense_bufaddr(struct ahd_softc *ahd, struct scb *scb)
{
        return (scb->sense_busaddr);
}

/************************** Interrupt Processing ******************************/
static __inline void    ahd_sync_qoutfifo(struct ahd_softc *ahd, int op);
static __inline void    ahd_sync_tqinfifo(struct ahd_softc *ahd, int op);
static __inline u_int   ahd_check_cmdcmpltqueues(struct ahd_softc *ahd);
static __inline int     ahd_intr(struct ahd_softc *ahd);

static __inline void
ahd_sync_qoutfifo(struct ahd_softc *ahd, int op)
{
        ahd_dmamap_sync(ahd, ahd->shared_data_dmat, ahd->shared_data_map.dmamap,
                        /*offset*/0,
                        /*len*/AHD_SCB_MAX * sizeof(struct ahd_completion), op);
}

static __inline void
ahd_sync_tqinfifo(struct ahd_softc *ahd, int op)
{
#ifdef AHD_TARGET_MODE
        if ((ahd->flags & AHD_TARGETROLE) != 0) {
                ahd_dmamap_sync(ahd, ahd->shared_data_dmat,
                                ahd->shared_data_map.dmamap,
                                ahd_targetcmd_offset(ahd, 0),
                                sizeof(struct target_cmd) * AHD_TMODE_CMDS,
                                op);
        }
#endif
}

/*
 * See if the firmware has posted any completed commands
 * into our in-core command complete fifos.
 */
#define AHD_RUN_QOUTFIFO 0x1
#define AHD_RUN_TQINFIFO 0x2
static __inline u_int
ahd_check_cmdcmpltqueues(struct ahd_softc *ahd)
{
        u_int retval;

        retval = 0;
        ahd_dmamap_sync(ahd, ahd->shared_data_dmat, ahd->shared_data_map.dmamap,
                        /*offset*/ahd->qoutfifonext * sizeof(*ahd->qoutfifo),
                        /*len*/sizeof(*ahd->qoutfifo), BUS_DMASYNC_POSTREAD);
        if (ahd->qoutfifo[ahd->qoutfifonext].valid_tag
          == ahd->qoutfifonext_valid_tag)
                retval |= AHD_RUN_QOUTFIFO;
#ifdef AHD_TARGET_MODE
        if ((ahd->flags & AHD_TARGETROLE) != 0
         && (ahd->flags & AHD_TQINFIFO_BLOCKED) == 0) {
                ahd_dmamap_sync(ahd, ahd->shared_data_dmat,
                                ahd->shared_data_map.dmamap,
                                ahd_targetcmd_offset(ahd, ahd->tqinfifofnext),
                                /*len*/sizeof(struct target_cmd),
                                BUS_DMASYNC_POSTREAD);
                if (ahd->targetcmds[ahd->tqinfifonext].cmd_valid != 0)
                        retval |= AHD_RUN_TQINFIFO;
        }
#endif
        return (retval);
}

/*
 * Catch an interrupt from the adapter
 */
static __inline int
ahd_intr(struct ahd_softc *ahd)
{
        u_int   intstat;

        if ((ahd->pause & INTEN) == 0) {
                /*
                 * Our interrupt is not enabled on the chip
                 * and may be disabled for re-entrancy reasons,
                 * so just return.  This is likely just a shared
                 * interrupt.
                 */
                return (0);
        }

        /*
         * Instead of directly reading the interrupt status register,
         * infer the cause of the interrupt by checking our in-core
         * completion queues.  This avoids a costly PCI bus read in
         * most cases.
         */
        if ((ahd->flags & AHD_ALL_INTERRUPTS) == 0
         && (ahd_check_cmdcmpltqueues(ahd) != 0))
                intstat = CMDCMPLT;
        else
                intstat = ahd_inb(ahd, INTSTAT);

        if ((intstat & INT_PEND) == 0)
                return (0);

        if (intstat & CMDCMPLT) {
                ahd_outb(ahd, CLRINT, CLRCMDINT);

                /*
                 * Ensure that the chip sees that we've cleared
                 * this interrupt before we walk the output fifo.
                 * Otherwise, we may, due to posted bus writes,
                 * clear the interrupt after we finish the scan,
                 * and after the sequencer has added new entries
                 * and asserted the interrupt again.
                 */
                if ((ahd->bugs & AHD_INTCOLLISION_BUG) != 0) {
                        if (ahd_is_paused(ahd)) {
                                /*
                                 * Potentially lost SEQINT.
                                 * If SEQINTCODE is non-zero,
                                 * simulate the SEQINT.
                                 */
                                if (ahd_inb(ahd, SEQINTCODE) != NO_SEQINT)
                                        intstat |= SEQINT;
                        }
                } else {
                        ahd_flush_device_writes(ahd);
                }
                ahd_run_qoutfifo(ahd);
                ahd->cmdcmplt_counts[ahd->cmdcmplt_bucket]++;
                ahd->cmdcmplt_total++;
#ifdef AHD_TARGET_MODE
                if ((ahd->flags & AHD_TARGETROLE) != 0)
                        ahd_run_tqinfifo(ahd, /*paused*/FALSE);
#endif
        }

        /*
         * Handle statuses that may invalidate our cached
         * copy of INTSTAT separately.
         */
        if (intstat == 0xFF && (ahd->features & AHD_REMOVABLE) != 0) {
                /* Hot eject.  Do nothing */
        } else if (intstat & HWERRINT) {
                ahd_handle_hwerrint(ahd);
        } else if ((intstat & (PCIINT|SPLTINT)) != 0) {
                ahd->bus_intr(ahd);
        } else {

                if ((intstat & SEQINT) != 0)
                        ahd_handle_seqint(ahd, intstat);

                if ((intstat & SCSIINT) != 0)
                        ahd_handle_scsiint(ahd, intstat);
        }
        return (1);
}

#endif  /* _AIC79XX_INLINE_H_ */