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Annotation of tme/bus/multibus/sun-sc.c, revision 1.1

1.1     ! root        1: /* $Id: sun-sc.c,v 1.3 2003/08/07 21:56:37 fredette Exp $ */
        !             2: 
        !             3: /* bus/multibus/sun-sc.c - implementation of Sun `sc' SCSI Multibus board emulation: */
        !             4: 
        !             5: /*
        !             6:  * Copyright (c) 2003 Matt Fredette
        !             7:  * All rights reserved.
        !             8:  *
        !             9:  * Redistribution and use in source and binary forms, with or without
        !            10:  * modification, are permitted provided that the following conditions
        !            11:  * are met:
        !            12:  * 1. Redistributions of source code must retain the above copyright
        !            13:  *    notice, this list of conditions and the following disclaimer.
        !            14:  * 2. Redistributions in binary form must reproduce the above copyright
        !            15:  *    notice, this list of conditions and the following disclaimer in the
        !            16:  *    documentation and/or other materials provided with the distribution.
        !            17:  * 3. All advertising materials mentioning features or use of this software
        !            18:  *    must display the following acknowledgement:
        !            19:  *      This product includes software developed by Matt Fredette.
        !            20:  * 4. The name of the author may not be used to endorse or promote products
        !            21:  *    derived from this software without specific prior written permission.
        !            22:  *
        !            23:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
        !            24:  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
        !            25:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
        !            26:  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
        !            27:  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
        !            28:  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
        !            29:  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            30:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
        !            31:  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
        !            32:  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
        !            33:  * POSSIBILITY OF SUCH DAMAGE.
        !            34:  */
        !            35: 
        !            36: #include <tme/common.h>
        !            37: _TME_RCSID("$Id: sun-sc.c,v 1.3 2003/08/07 21:56:37 fredette Exp $");
        !            38: 
        !            39: /* includes: */
        !            40: #include <tme/generic/bus-device.h>
        !            41: #include <tme/generic/scsi.h>
        !            42: 
        !            43: /* macros: */
        !            44: 
        !            45: /* register offsets and sizes: */
        !            46: #define TME_SUN_SC_REG_DATA    (0)
        !            47: #define TME_SUN_SC_SIZ_DATA    (sizeof(tme_uint8_t))
        !            48: #define TME_SUN_SC_REG_CMD_STAT        (2)
        !            49: #define TME_SUN_SC_SIZ_CMD_STAT        (sizeof(tme_uint8_t))
        !            50: #define TME_SUN_SC_REG_ICR     (4)
        !            51: #define TME_SUN_SC_SIZ_ICR     (sizeof(tme_uint16_t))
        !            52: #define TME_SUN_SC_REG_DMA_H   (8)
        !            53: #define TME_SUN_SC_SIZ_DMA_H   (sizeof(tme_uint16_t))
        !            54: #define TME_SUN_SC_REG_DMA_L   (10)
        !            55: #define TME_SUN_SC_SIZ_DMA_L   (sizeof(tme_uint16_t))
        !            56: #define TME_SUN_SC_REG_DMA_LEN (12)
        !            57: #define TME_SUN_SC_SIZ_DMA_LEN (sizeof(tme_uint16_t))
        !            58: #define TME_SUN_SC_REG_INTVEC  (15)
        !            59: #define TME_SUN_SC_SIZ_INTVEC  (sizeof(tme_uint8_t))
        !            60: #define TME_SUN_SC_SIZ_CARD    (TME_SUN_SC_REG_INTVEC + TME_SUN_SC_SIZ_INTVEC)
        !            61: 
        !            62: /* the bits in the Interface Control Register.  bits greater than
        !            63:    or equal to SUNSCPAL_ICR_BUSY are read-only: */
        !            64: #define _TME_SUN_SC_ICR_RO_BITS                (~(TME_SUN_SC_ICR_BUSY - 1))
        !            65: #define TME_SUN_SC_ICR_PARITY_ERROR    (0x8000)  /* parity error */
        !            66: #define TME_SUN_SC_ICR_BUS_ERROR       (0x4000)  /* bus error */
        !            67: #define TME_SUN_SC_ICR_ODD_LENGTH      (0x2000)  /* odd length */
        !            68: #define TME_SUN_SC_ICR_INT_REQUEST     (0x1000)  /* interrupt request */
        !            69: #define TME_SUN_SC_ICR_REQUEST         (0x0800)  /* request */
        !            70: #define TME_SUN_SC_ICR_MESSAGE         (0x0400)  /* message */
        !            71: #define TME_SUN_SC_ICR_COMMAND_DATA    (0x0200)  /* 1=command, 0=data */
        !            72: #define TME_SUN_SC_ICR_INPUT_OUTPUT    (0x0100)  /* 1=input (initiator should read), 0=output */
        !            73: #define TME_SUN_SC_ICR_PARITY          (0x0080)  /* parity */
        !            74: #define TME_SUN_SC_ICR_BUSY            (0x0040)  /* busy */
        !            75: #define TME_SUN_SC_ICR_SELECT          (0x0020)  /* select */
        !            76: #define TME_SUN_SC_ICR_RESET           (0x0010)  /* reset */
        !            77: #define TME_SUN_SC_ICR_PARITY_ENABLE   (0x0008)  /* enable parity */
        !            78: #define TME_SUN_SC_ICR_WORD_MODE       (0x0004)  /* word mode */
        !            79: #define TME_SUN_SC_ICR_DMA_ENABLE      (0x0002)  /* enable DMA */
        !            80: #define TME_SUN_SC_ICR_INT_ENABLE      (0x0001)  /* enable interrupts */
        !            81: 
        !            82: /* this gets the current SCSI information transfer bus phase,
        !            83:    including BSY, from an ICR value: */
        !            84: #define TME_SUN_SC_BUS_PHASE(icr)      \
        !            85:   ((icr)                               \
        !            86:    & (TME_SUN_SC_ICR_BUSY              \
        !            87:       | TME_SUN_SC_ICR_MESSAGE         \
        !            88:       | TME_SUN_SC_ICR_COMMAND_DATA    \
        !            89:       | TME_SUN_SC_ICR_INPUT_OUTPUT))
        !            90: 
        !            91: /* these get and put a 16-bit register: */
        !            92: #define TME_SUN_SC_REG16_GET(sun_sc, reg)      \
        !            93:   tme_betoh_u16(*((tme_uint16_t *) &(sun_sc)->tme_sun_sc_card[reg]))
        !            94: #define TME_SUN_SC_REG16_PUT(sun_sc, reg, val) \
        !            95:   (*((tme_uint16_t *) &(sun_sc)->tme_sun_sc_card[reg]) = tme_htobe_u16(val))
        !            96: 
        !            97: /* these get and put the ICR: */
        !            98: #define TME_SUN_SC_ICR_GET(sun_sc)     \
        !            99:   TME_SUN_SC_REG16_GET(sun_sc, TME_SUN_SC_REG_ICR)
        !           100: #define TME_SUN_SC_ICR_PUT(sun_sc, icr)        \
        !           101:   TME_SUN_SC_REG16_PUT(sun_sc, TME_SUN_SC_REG_ICR, icr)
        !           102: 
        !           103: /* the size of the cycle callout ring buffer: */
        !           104: #define TME_SUN_SC_CYCLE_RING_SIZE     (4)
        !           105: 
        !           106: /* the callout flags: */
        !           107: #define TME_SUN_SC_CALLOUT_CHECK               (0)
        !           108: #define TME_SUN_SC_CALLOUT_RUNNING             TME_BIT(0)
        !           109: #define TME_SUN_SC_CALLOUTS_MASK               (-2)
        !           110: #define  TME_SUN_SC_CALLOUT_CYCLE              TME_BIT(1)
        !           111: #define  TME_SUN_SC_CALLOUT_TLB_FILL           TME_BIT(2)
        !           112: #define         TME_SUN_SC_CALLOUT_INT                 TME_BIT(3)
        !           113: 
        !           114: #if 1
        !           115: #define TME_SUN_SC_DEBUG
        !           116: #endif
        !           117: 
        !           118: /* structures: */
        !           119: 
        !           120: /* an entry in the cycle callout ring buffer: */
        !           121: struct tme_sun_sc_cycle {
        !           122: 
        !           123:   /* the SCSI control and data signals to assert: */
        !           124:   tme_scsi_control_t tme_sun_sc_cycle_control;
        !           125:   tme_scsi_data_t tme_sun_sc_cycle_data;
        !           126: 
        !           127:   /* the SCSI sequence to run: */
        !           128:   const struct tme_scsi_sequence *tme_sun_sc_cycle_sequence;
        !           129: 
        !           130:   /* a DMA structure needed: */
        !           131:   struct tme_scsi_dma tme_sun_sc_cycle_dma;
        !           132: 
        !           133:   /* for the cmd_stat DMA, the cmd_stat value: */
        !           134:   tme_uint8_t tme_sun_sc_cycle_cmd_stat;
        !           135: };
        !           136: 
        !           137: /* the card: */
        !           138: struct tme_sun_sc {
        !           139: 
        !           140:   /* our simple bus device header: */
        !           141:   struct tme_bus_device tme_sun_sc_device;
        !           142: #define tme_sun_sc_element tme_sun_sc_device.tme_bus_device_element
        !           143: 
        !           144:   /* the mutex protecting the card: */
        !           145:   tme_mutex_t tme_sun_sc_mutex;
        !           146: 
        !           147:   /* the rwlock protecting the card: */
        !           148:   tme_rwlock_t tme_sun_sc_rwlock;
        !           149: 
        !           150:   /* the SCSI bus connection: */
        !           151:   struct tme_scsi_connection *tme_sun_sc_scsi_connection;
        !           152: 
        !           153:   /* the callout flags: */
        !           154:   int tme_sun_sc_callout_flags;
        !           155: 
        !           156:   /* if our interrupt line is currently asserted: */
        !           157:   int tme_sun_sc_int_asserted;
        !           158: 
        !           159:   /* it's easiest to just model the card as a chunk of memory: */
        !           160:   tme_uint8_t tme_sun_sc_card[TME_SUN_SC_SIZ_CARD];
        !           161: 
        !           162:   /* the SCSI sequences: */
        !           163:   const struct tme_scsi_sequence *tme_sun_sc_sequence_info_dma_initiator;
        !           164:   const struct tme_scsi_sequence *tme_sun_sc_sequence_wait_change;
        !           165: 
        !           166:   /* the cycle ring buffer: */
        !           167:   struct tme_sun_sc_cycle tme_sun_sc_cycles[TME_SUN_SC_CYCLE_RING_SIZE];
        !           168:   int tme_sun_sc_cycle_head;
        !           169:   int tme_sun_sc_cycle_tail;
        !           170: 
        !           171:   /* our DMA TLB set: */
        !           172:   TME_ATOMIC(struct tme_bus_tlb *, tme_sun_sc_dma_tlb);
        !           173: 
        !           174:   /* the internal DMA buffer: */
        !           175:   tme_uint8_t tme_sun_sc_int_dma[2];
        !           176: 
        !           177: #ifndef TME_NO_LOG
        !           178:   tme_uint16_t tme_sun_sc_last_log_icr;
        !           179: #endif /* !TME_NO_LOG */
        !           180: };
        !           181: 
        !           182: /* globals: */
        !           183: 
        !           184: /* the Sun sc bus router: */
        !           185: static const tme_bus_lane_t tme_sun_sc_router[TME_BUS_ROUTER_SIZE(TME_BUS16_LOG2) * 2] = {
        !           186:   
        !           187:   /* [sc]   initiator cycle size: 8 bits
        !           188:      [gen]  responding port size: 8 bits
        !           189:      [gen]  responding port least lane: 0: */
        !           190:   /* D7-D0 */  TME_BUS_LANE_ROUTE(0),
        !           191:   /* D15-D8 */ TME_BUS_LANE_UNDEF,
        !           192: 
        !           193:   /* [sc]   initiator cycle size: 8 bits
        !           194:      [gen]  responding port size: 8 bits
        !           195:      [gen]  responding port least lane: 1: */
        !           196:   /* D7-D0 */  TME_BUS_LANE_ROUTE(0),
        !           197:   /* D15-D8 */ TME_BUS_LANE_UNDEF | TME_BUS_LANE_WARN,
        !           198: 
        !           199:   /* [sc]   initiator cycle size: 8 bits
        !           200:      [gen]  responding port size: 16 bits
        !           201:      [gen]  responding port least lane: 0: */
        !           202:   /* D7-D0 */  TME_BUS_LANE_ROUTE(0),
        !           203:   /* D15-D8 */ TME_BUS_LANE_UNDEF | TME_BUS_LANE_WARN,
        !           204: 
        !           205:   /* [sc]   initiator cycle size: 8 bits
        !           206:      [gen]  responding port size: 16 bits
        !           207:      [gen]  responding port least lane: 1 - invalid, array placeholder: */
        !           208:   /* D7-D0 */  TME_BUS_LANE_ABORT,
        !           209:   /* D15-D8 */ TME_BUS_LANE_ABORT,
        !           210: 
        !           211:   /* [sc]   initiator cycle size: 16 bits
        !           212:      [gen]  responding port size: 8 bits
        !           213:      [gen]  responding port least lane: 0: */
        !           214:   /* D7-D0 */  TME_BUS_LANE_ROUTE(0),
        !           215:   /* D15-D8 */ TME_BUS_LANE_ROUTE(1) | TME_BUS_LANE_WARN,
        !           216: 
        !           217:   /* [sc]   initiator cycle size: 16 bits
        !           218:      [gen]  responding port size: 8 bits
        !           219:      [gen]  responding port least lane: 1: */
        !           220:   /* D7-D0 */  TME_BUS_LANE_ROUTE(0) | TME_BUS_LANE_WARN,
        !           221:   /* D15-D8 */ TME_BUS_LANE_ROUTE(1) | TME_BUS_LANE_WARN,
        !           222: 
        !           223:   /* [sc]   initiator cycle size: 16 bits
        !           224:      [gen]  responding port size: 16 bits
        !           225:      [gen]  responding port least lane: 0: */
        !           226:   /* D7-D0 */  TME_BUS_LANE_ROUTE(0),
        !           227:   /* D15-D8 */ TME_BUS_LANE_ROUTE(1),
        !           228: 
        !           229:   /* [sc]   initiator cycle size: 16 bits
        !           230:      [gen]  responding port size: 16 bits
        !           231:      [gen]  responding port least lane: 1 - invalid, array placeholder: */
        !           232:   /* D7-D0 */  TME_BUS_LANE_ABORT,
        !           233:   /* D15-D8 */ TME_BUS_LANE_ABORT,
        !           234: };
        !           235: 
        !           236: #ifdef TME_SUN_SC_DEBUG
        !           237: void
        !           238: _tme_sun_sc_reg16_put(struct tme_sun_sc *sun_sc,
        !           239:                      int reg,
        !           240:                      tme_uint16_t val_new)
        !           241: {
        !           242:   const char *reg_name;
        !           243:   tme_uint16_t val_old;
        !           244: 
        !           245:   val_old = TME_SUN_SC_REG16_GET(sun_sc, reg);
        !           246:   if (val_old == val_new) {
        !           247:     return;
        !           248:   }
        !           249:   TME_SUN_SC_REG16_PUT(sun_sc, reg, val_new);
        !           250: 
        !           251:   switch (reg) {
        !           252:   case TME_SUN_SC_REG_ICR:
        !           253:     reg_name = "icr";
        !           254:     break;
        !           255:   case TME_SUN_SC_REG_DMA_H:
        !           256:   case TME_SUN_SC_REG_DMA_L:
        !           257:     tme_log(&sun_sc->tme_sun_sc_element->tme_element_log_handle,
        !           258:            100, TME_OK,
        !           259:            (&sun_sc->tme_sun_sc_element->tme_element_log_handle,
        !           260:             "dvma now 0x%04x%04x (len 0x%04x)",
        !           261:             TME_SUN_SC_REG16_GET(sun_sc,
        !           262:                                  TME_SUN_SC_REG_DMA_H),
        !           263:             TME_SUN_SC_REG16_GET(sun_sc,
        !           264:                                  TME_SUN_SC_REG_DMA_L),
        !           265:             (TME_SUN_SC_REG16_GET(sun_sc,
        !           266:                                   TME_SUN_SC_REG_DMA_LEN)
        !           267:              ^ 0xffff)));
        !           268:     return;
        !           269:   case TME_SUN_SC_REG_DMA_LEN:
        !           270:     reg_name = "len";
        !           271:     val_new ^= 0xffff;
        !           272:     break;
        !           273:   default:
        !           274:     reg_name = "???";
        !           275:     break;
        !           276:   }
        !           277:   tme_log(&sun_sc->tme_sun_sc_element->tme_element_log_handle,
        !           278:            100, TME_OK,
        !           279:            (&sun_sc->tme_sun_sc_element->tme_element_log_handle,
        !           280:             "%s now 0x%04x",
        !           281:             reg_name,
        !           282:             val_new));
        !           283: }
        !           284: #undef TME_SUN_SC_REG16_PUT
        !           285: #define TME_SUN_SC_REG16_PUT _tme_sun_sc_reg16_put
        !           286: #endif /* TME_SUN_SC_DEBUG */
        !           287: 
        !           288: /* this allocates the next cycle in the ring buffer: */
        !           289: struct tme_sun_sc_cycle *
        !           290: _tme_sun_sc_cycle_new(struct tme_sun_sc *sun_sc,
        !           291:                      const struct tme_scsi_sequence *sequence)
        !           292: {
        !           293:   int old_head;
        !           294:   struct tme_sun_sc_cycle *sun_sc_cycle;
        !           295:   const struct tme_sun_sc_cycle *sun_sc_cycle_old;
        !           296: 
        !           297:   /* abort if the ring buffer overflows: */
        !           298:   old_head = sun_sc->tme_sun_sc_cycle_head;
        !           299:   sun_sc->tme_sun_sc_cycle_head
        !           300:     = ((old_head
        !           301:        + 1)
        !           302:        & (TME_SUN_SC_CYCLE_RING_SIZE
        !           303:          - 1));
        !           304:   if ((sun_sc->tme_sun_sc_cycle_head
        !           305:        == sun_sc->tme_sun_sc_cycle_tail)
        !           306:       && (sun_sc->tme_sun_sc_scsi_connection
        !           307:          != NULL)) {
        !           308:     abort();
        !           309:   }
        !           310: 
        !           311:   /* initialize and return the cycle.  we copy the previous cycle's
        !           312:      control signals, (and data signals too, unless the caller wants
        !           313:      the DMA sequence), so that callers only have to change the values
        !           314:      that they know are changing: */
        !           315:   sun_sc_cycle
        !           316:     = &sun_sc->tme_sun_sc_cycles[old_head];
        !           317:   memset(sun_sc_cycle, 0, sizeof(*sun_sc_cycle));
        !           318:   sun_sc_cycle_old
        !           319:     = &sun_sc->tme_sun_sc_cycles[((old_head
        !           320:                                   - 1)
        !           321:                                  & (TME_SUN_SC_CYCLE_RING_SIZE
        !           322:                                     - 1))];
        !           323:   sun_sc_cycle->tme_sun_sc_cycle_control
        !           324:     = sun_sc_cycle_old->tme_sun_sc_cycle_control;
        !           325:   sun_sc_cycle->tme_sun_sc_cycle_data
        !           326:     = ((sequence
        !           327:        == sun_sc->tme_sun_sc_sequence_info_dma_initiator)
        !           328:        ? 0
        !           329:        : sun_sc_cycle_old->tme_sun_sc_cycle_data);
        !           330:   sun_sc_cycle->tme_sun_sc_cycle_sequence
        !           331:     = sequence;
        !           332:   /* XXX parity? */
        !           333:   sun_sc_cycle->tme_sun_sc_cycle_dma.tme_scsi_dma_flags
        !           334:     = TME_SCSI_DMA_8BIT;
        !           335:   return (sun_sc_cycle);
        !           336: }
        !           337: 
        !           338: /* this does a bus cycle to read or write into our internal DMA
        !           339:    buffer: */
        !           340: static int
        !           341: _tme_sun_sc_bus_cycle_dma(struct tme_sun_sc *sun_sc,
        !           342:                          struct tme_bus_tlb *tlb,
        !           343:                          tme_uint8_t cycle_type,
        !           344:                          tme_bus_addr_t address,
        !           345:                          int word_mode)
        !           346: {
        !           347:   struct tme_bus_cycle cycle_init;
        !           348:   int rc;
        !           349: 
        !           350:   /* use our internal DMA buffer: */ 
        !           351:   cycle_init.tme_bus_cycle_buffer
        !           352:     = &sun_sc->tme_sun_sc_int_dma[0];
        !           353:   
        !           354:   /* if we're in word mode, use the 16-bit bus router
        !           355:      and a 16-bit cycle size: */
        !           356:   if (word_mode) {
        !           357:     cycle_init.tme_bus_cycle_lane_routing
        !           358:       = &tme_sun_sc_router[TME_BUS_ROUTER_SIZE(TME_BUS16_LOG2)];
        !           359:     cycle_init.tme_bus_cycle_size 
        !           360:       = sizeof(tme_uint16_t);
        !           361:   }
        !           362:   
        !           363:   /* otherwise, use the 8-bit bus router and an 8-bit
        !           364:      cycle size: */
        !           365:   else {
        !           366:     cycle_init.tme_bus_cycle_lane_routing
        !           367:       = &tme_sun_sc_router[0];
        !           368:     cycle_init.tme_bus_cycle_size 
        !           369:       = sizeof(tme_uint16_t);
        !           370:   }
        !           371:   
        !           372:   assert (tlb->tme_bus_tlb_addr_shift == 0);
        !           373:   cycle_init.tme_bus_cycle_address
        !           374:     = (address
        !           375:        + tlb->tme_bus_tlb_addr_offset);
        !           376:   
        !           377:   cycle_init.tme_bus_cycle_buffer_increment
        !           378:     = 1;
        !           379: 
        !           380:   cycle_init.tme_bus_cycle_type
        !           381:     = cycle_type;
        !           382: 
        !           383:   cycle_init.tme_bus_cycle_port = 
        !           384:     TME_BUS_CYCLE_PORT(0, TME_BUS16_LOG2);
        !           385:   
        !           386:   /* unlock the mutex: */
        !           387:   tme_mutex_unlock(&sun_sc->tme_sun_sc_mutex);
        !           388: 
        !           389:   /* run the bus cycle: */
        !           390:   rc = ((*tlb->tme_bus_tlb_cycle)
        !           391:        (tlb->tme_bus_tlb_cycle_private,
        !           392:         &cycle_init));
        !           393:        
        !           394:   /* lock the mutex: */
        !           395:   tme_mutex_lock(&sun_sc->tme_sun_sc_mutex);
        !           396: 
        !           397:   return (rc);
        !           398: }  
        !           399: 
        !           400: /* the Sun sc callout function.  it must be called with the mutex locked: */
        !           401: static void
        !           402: _tme_sun_sc_callout(struct tme_sun_sc *sun_sc, int new_callouts)
        !           403: {
        !           404:   struct tme_scsi_connection *conn_scsi;
        !           405:   struct tme_bus_connection *conn_bus;
        !           406:   struct tme_bus_tlb *tlb;
        !           407:   int old_tail;
        !           408:   struct tme_sun_sc_cycle *sun_sc_cycle;
        !           409:   int callouts, later_callouts;
        !           410:   tme_bus_addr_t address;
        !           411:   tme_uint16_t resid;
        !           412:   tme_uint8_t cycle_type;
        !           413:   tme_bus_addr_t avail;
        !           414:   tme_uint8_t *emulator_off;
        !           415:   tme_uint16_t icr;
        !           416:   int rc;
        !           417:   int int_asserted;
        !           418:   
        !           419:   /* add in any new callouts: */
        !           420:   sun_sc->tme_sun_sc_callout_flags |= new_callouts;
        !           421: 
        !           422:   /* if this function is already running in another thread, simply
        !           423:      return now.  the other thread will do our work: */
        !           424:   if (sun_sc->tme_sun_sc_callout_flags
        !           425:       & TME_SUN_SC_CALLOUT_RUNNING) {
        !           426:     return;
        !           427:   }
        !           428: 
        !           429:   /* callouts are now running: */
        !           430:   sun_sc->tme_sun_sc_callout_flags
        !           431:     |= TME_SUN_SC_CALLOUT_RUNNING;
        !           432: 
        !           433:   /* assume that we won't need any later callouts: */
        !           434:   later_callouts = 0;
        !           435: 
        !           436:   /* loop while callouts are needed: */
        !           437:   for (; ((callouts
        !           438:           = sun_sc->tme_sun_sc_callout_flags)
        !           439:          & TME_SUN_SC_CALLOUTS_MASK); ) {
        !           440: 
        !           441:     /* clear the needed callouts: */
        !           442:     sun_sc->tme_sun_sc_callout_flags
        !           443:       = (callouts
        !           444:         & ~TME_SUN_SC_CALLOUTS_MASK);
        !           445:     callouts
        !           446:       &= TME_SUN_SC_CALLOUTS_MASK;
        !           447: 
        !           448:     /* get this card's bus and SCSI connections: */
        !           449:     conn_scsi = sun_sc->tme_sun_sc_scsi_connection;
        !           450:     conn_bus = TME_ATOMIC_READ(struct tme_bus_connection *,
        !           451:                               sun_sc->tme_sun_sc_device.tme_bus_device_connection);
        !           452: 
        !           453:     /* if we need to call out a SCSI bus cycle: */
        !           454:     if (callouts & TME_SUN_SC_CALLOUT_CYCLE) {
        !           455: 
        !           456:       /* there must be a cycle to call out: */
        !           457:       old_tail = sun_sc->tme_sun_sc_cycle_tail;
        !           458:       assert (old_tail
        !           459:              != sun_sc->tme_sun_sc_cycle_head);
        !           460:       sun_sc_cycle
        !           461:        = &sun_sc->tme_sun_sc_cycles[old_tail];
        !           462: 
        !           463:       /* unlock the mutex: */
        !           464:       tme_mutex_unlock(&sun_sc->tme_sun_sc_mutex);
        !           465:       
        !           466:       /* do the callout: */
        !           467:       rc = (conn_scsi != NULL
        !           468:            ? ((*conn_scsi->tme_scsi_connection_cycle)
        !           469:               (conn_scsi,
        !           470:                sun_sc_cycle->tme_sun_sc_cycle_control,
        !           471:                sun_sc_cycle->tme_sun_sc_cycle_data,
        !           472:                sun_sc_cycle->tme_sun_sc_cycle_sequence,
        !           473:                ((sun_sc_cycle->tme_sun_sc_cycle_sequence
        !           474:                  == sun_sc->tme_sun_sc_sequence_info_dma_initiator)
        !           475:                 ? &sun_sc_cycle->tme_sun_sc_cycle_dma
        !           476:                 : NULL)))
        !           477:            : TME_OK);
        !           478:        
        !           479:       /* lock the mutex: */
        !           480:       tme_mutex_lock(&sun_sc->tme_sun_sc_mutex);
        !           481:       
        !           482:       /* if the callout was unsuccessful, remember that at some later
        !           483:         time this callout should be attempted again: */
        !           484:       if (rc != TME_OK) {
        !           485:        later_callouts |= TME_SUN_SC_CALLOUT_CYCLE;
        !           486:       }
        !           487: 
        !           488:       /* otherwise, this callout was successful.  if this cycle did
        !           489:         not use the DMA initiator sequence, it either used no
        !           490:         sequence or it used the wait_change sequence: */
        !           491:       else if (sun_sc_cycle->tme_sun_sc_cycle_sequence
        !           492:               != sun_sc->tme_sun_sc_sequence_info_dma_initiator) {
        !           493: 
        !           494:        /* advance the tail pointer if it hasn't been advanced
        !           495:           already: */
        !           496:        if (sun_sc->tme_sun_sc_cycle_tail
        !           497:            == old_tail) {
        !           498:          sun_sc->tme_sun_sc_cycle_tail
        !           499:            = ((sun_sc->tme_sun_sc_cycle_tail
        !           500:                + 1)
        !           501:               & (TME_SUN_SC_CYCLE_RING_SIZE
        !           502:                  - 1));
        !           503:        }
        !           504: 
        !           505:        /* if there are more cycles to run, run them now: */
        !           506:        if (sun_sc->tme_sun_sc_cycle_tail
        !           507:            != sun_sc->tme_sun_sc_cycle_head) {
        !           508:          sun_sc->tme_sun_sc_callout_flags
        !           509:            |= TME_SUN_SC_CALLOUT_CYCLE;
        !           510:        }
        !           511:       }
        !           512:     }
        !           513: 
        !           514:     /* if we need to call out a TLB fill: */
        !           515:     if (callouts & TME_SUN_SC_CALLOUT_TLB_FILL) {
        !           516: 
        !           517:       /* get the current ICR value: */
        !           518:       icr = TME_SUN_SC_ICR_GET(sun_sc);
        !           519: 
        !           520:       /* get the DMA address: */
        !           521:       address
        !           522:        = TME_SUN_SC_REG16_GET(sun_sc,
        !           523:                               TME_SUN_SC_REG_DMA_H);
        !           524:       address
        !           525:        = ((address
        !           526:            << 16)
        !           527:           | TME_SUN_SC_REG16_GET(sun_sc,
        !           528:                                  TME_SUN_SC_REG_DMA_L));
        !           529: 
        !           530:       /* get the cycle type: */
        !           531:       cycle_type
        !           532:        = ((icr
        !           533:            & TME_SUN_SC_ICR_INPUT_OUTPUT)
        !           534:           ? TME_BUS_CYCLE_WRITE
        !           535:           : TME_BUS_CYCLE_READ);
        !           536: 
        !           537:       /* get the resid: */
        !           538:       resid
        !           539:        = (TME_SUN_SC_REG16_GET(sun_sc,
        !           540:                                TME_SUN_SC_REG_DMA_LEN)
        !           541:           ^ 0xffff);
        !           542:       assert (resid
        !           543:              >= ((icr
        !           544:                   & TME_SUN_SC_ICR_WORD_MODE)
        !           545:                  ? sizeof(tme_uint16_t)
        !           546:                  : sizeof(tme_uint8_t)));
        !           547: 
        !           548:       /* get the TLB entry: */
        !           549:       tlb
        !           550:        = TME_ATOMIC_READ(struct tme_bus_tlb *,
        !           551:                          sun_sc->tme_sun_sc_dma_tlb);
        !           552: 
        !           553:       /* unlock the mutex: */
        !           554:       tme_mutex_unlock(&sun_sc->tme_sun_sc_mutex);
        !           555:       
        !           556:       /* do the callout: */
        !           557:       rc = (conn_bus != NULL
        !           558:            ? ((*conn_bus->tme_bus_tlb_fill)
        !           559:               (conn_bus,
        !           560:                tlb,
        !           561:                address,
        !           562:                cycle_type))
        !           563:            : TME_OK);
        !           564:        
        !           565:       /* lock the mutex: */
        !           566:       tme_mutex_lock(&sun_sc->tme_sun_sc_mutex);
        !           567:       
        !           568:       /* if the callout was unsuccessful, remember that at some later
        !           569:         time this callout should be attempted again: */
        !           570:       if (rc != TME_OK) {
        !           571:        later_callouts |= TME_SUN_SC_CALLOUT_TLB_FILL;
        !           572:       }
        !           573: 
        !           574:       /* otherwise, use the filled TLB entry to start a SCSI
        !           575:         DMA sequence: */
        !           576:       else {
        !           577: 
        !           578:        /* get the number of bytes available in this TLB entry: */
        !           579:        avail
        !           580:          = ((TME_ATOMIC_READ(tme_bus_addr_t,
        !           581:                              tlb->tme_bus_tlb_addr_last)
        !           582:              - address)
        !           583:             + 1);
        !           584:        if (avail == 0
        !           585:            || avail > resid) {
        !           586:          avail = resid;
        !           587:        }
        !           588:        assert (avail
        !           589:                >= ((icr
        !           590:                     & TME_SUN_SC_ICR_WORD_MODE)
        !           591:                    ? sizeof(tme_uint16_t)
        !           592:                    : sizeof(tme_uint8_t)));
        !           593: 
        !           594:        /* allocate the new SCSI bus cycle: */
        !           595:        sun_sc_cycle
        !           596:          = _tme_sun_sc_cycle_new(sun_sc,
        !           597:                                  sun_sc->tme_sun_sc_sequence_info_dma_initiator);
        !           598: 
        !           599:        /* if this TLB entry allows fast transfers: */
        !           600:        emulator_off
        !           601:          = ((cycle_type
        !           602:              == TME_BUS_CYCLE_READ)
        !           603:             ? tlb->tme_bus_tlb_emulator_off_read
        !           604:             : tlb->tme_bus_tlb_emulator_off_write);
        !           605:        if (emulator_off
        !           606:            != TME_EMULATOR_OFF_UNDEF) {
        !           607: 
        !           608:          /* do the SCSI DMA sequence with the TLB fast transfer
        !           609:              buffer: */
        !           610:          sun_sc_cycle->tme_sun_sc_cycle_dma.tme_scsi_dma_in
        !           611:            = emulator_off + address;
        !           612:        }
        !           613: 
        !           614:        /* otherwise, this TLB entry does not allow fast transfers: */
        !           615:        else {
        !           616: 
        !           617:          /* if this we need to read from this TLB, do a memory
        !           618:             read cycle into our internal DMA buffer: */
        !           619:          if (cycle_type == TME_BUS_CYCLE_READ) {
        !           620:            rc = _tme_sun_sc_bus_cycle_dma(sun_sc,
        !           621:                                           tlb,
        !           622:                                           TME_BUS_CYCLE_READ,
        !           623:                                           address,
        !           624:                                           (icr
        !           625:                                            & TME_SUN_SC_ICR_WORD_MODE));
        !           626:            assert (rc == TME_OK);
        !           627:          }
        !           628: 
        !           629:          /* do the SCSI DMA sequence with our internal DMA buffer: */
        !           630:          sun_sc_cycle->tme_sun_sc_cycle_dma.tme_scsi_dma_in
        !           631:            = emulator_off + address;
        !           632:          avail
        !           633:            = ((icr
        !           634:                & TME_SUN_SC_ICR_WORD_MODE)
        !           635:               ? sizeof(tme_uint16_t)
        !           636:               : sizeof(tme_uint8_t));
        !           637:        }
        !           638: 
        !           639:        /* finish the SCSI cycle: */
        !           640:        sun_sc_cycle->tme_sun_sc_cycle_dma.tme_scsi_dma_out
        !           641:          = sun_sc_cycle->tme_sun_sc_cycle_dma.tme_scsi_dma_in;
        !           642:        sun_sc_cycle->tme_sun_sc_cycle_dma.tme_scsi_dma_resid
        !           643:          = avail;
        !           644: 
        !           645:        /* we now need to call out a SCSI cycle: */
        !           646:        sun_sc->tme_sun_sc_callout_flags
        !           647:          |= TME_SUN_SC_CALLOUT_CYCLE;
        !           648:       }
        !           649:     }
        !           650: 
        !           651:     /* if we need to call out a possible change to our interrupt
        !           652:        signal: */
        !           653:     if (callouts & TME_SUN_SC_CALLOUT_INT) {
        !           654: 
        !           655:       /* get the current ICR value: */
        !           656:       icr = TME_SUN_SC_ICR_GET(sun_sc);
        !           657: 
        !           658:       /* see if the interrupt signal should be asserted or negated: */
        !           659:       int_asserted = ((icr
        !           660:                       & TME_SUN_SC_ICR_INT_REQUEST)
        !           661:                      && (icr
        !           662:                          & TME_SUN_SC_ICR_INT_ENABLE));
        !           663: 
        !           664:       /* if the interrupt signal doesn't already have the right state: */
        !           665:       if (!int_asserted
        !           666:          != !sun_sc->tme_sun_sc_int_asserted) {
        !           667: 
        !           668:        /* unlock our mutex: */
        !           669:        tme_mutex_unlock(&sun_sc->tme_sun_sc_mutex);
        !           670:        
        !           671:        /* call out the bus interrupt signal edge: */
        !           672:        rc = (*conn_bus->tme_bus_signal)
        !           673:          (conn_bus,
        !           674:           TME_BUS_SIGNAL_INT_UNSPEC
        !           675:           | (int_asserted
        !           676:              ? TME_BUS_SIGNAL_LEVEL_ASSERTED
        !           677:              : TME_BUS_SIGNAL_LEVEL_NEGATED)
        !           678:           | TME_BUS_SIGNAL_EDGE);
        !           679: 
        !           680:        /* lock our mutex: */
        !           681:        tme_mutex_lock(&sun_sc->tme_sun_sc_mutex);
        !           682:        
        !           683:        /* if this callout was successful, note the new state of the
        !           684:           interrupt signal: */
        !           685:        if (rc == TME_OK) {
        !           686:          sun_sc->tme_sun_sc_int_asserted = int_asserted;
        !           687:        }
        !           688: 
        !           689:        /* otherwise, remember that at some later time this callout
        !           690:           should be attempted again: */
        !           691:        else {
        !           692:          later_callouts |= TME_SUN_SC_CALLOUT_INT;
        !           693:        }
        !           694:       }
        !           695:     }
        !           696:   }
        !           697:   
        !           698:   /* put in any later callouts, and clear that callouts are running: */
        !           699:   sun_sc->tme_sun_sc_callout_flags = later_callouts;
        !           700: }
        !           701: 
        !           702: /* the Sun sc bus cycle handler for the data and cmd_stat registers.
        !           703:    these registers are connected directly to the SCSI data signals.
        !           704: 
        !           705:    a read of one of these registers samples the SCSI data bus, and a
        !           706:    write to one of these registers changes the SCSI data bus signals
        !           707:    asserted by the card.
        !           708: 
        !           709:    additionally, depending on context, a read or write of one of these
        !           710:    registers will cause the card to execute the initiator's side of a
        !           711:    REQ/ACK handshake to transfer a byte.
        !           712: 
        !           713:    a read or write of the cmd_stat register always causes the
        !           714:    handshake.  a read or write of the data register when the SCSI bus
        !           715:    is in the DATA IN or DATA OUT phase with REQ asserted also causes
        !           716:    the handshake: */
        !           717: static int
        !           718: _tme_sun_sc_bus_cycle_data_reg(struct tme_sun_sc *sun_sc,
        !           719:                               struct tme_bus_cycle *cycle_init,
        !           720:                               int is_cmd_stat)
        !           721: {
        !           722:   tme_uint16_t icr;
        !           723:   tme_scsi_data_t data_old, data_new;
        !           724:   struct tme_sun_sc_cycle *sun_sc_cycle;
        !           725:   int new_callouts;
        !           726: 
        !           727:   /* assume we won't need any new callouts: */
        !           728:   new_callouts = 0;
        !           729: 
        !           730:   /* lock the mutex: */
        !           731:   tme_mutex_lock(&sun_sc->tme_sun_sc_mutex);
        !           732: 
        !           733:   /* get the current ICR value: */
        !           734:   icr = TME_SUN_SC_ICR_GET(sun_sc);
        !           735: 
        !           736:   /* save the old data register (really, the current
        !           737:      signals asserted on the data bus), and, in case
        !           738:      this is a read of the cmd_stat register, save
        !           739:      it in that register: */
        !           740:   data_old = sun_sc->tme_sun_sc_card[TME_SUN_SC_REG_DATA];
        !           741:   sun_sc->tme_sun_sc_card[TME_SUN_SC_REG_CMD_STAT] = data_old;
        !           742: 
        !           743:   /* run the cycle: */
        !           744:   tme_bus_cycle_xfer_memory(cycle_init, 
        !           745:                            sun_sc->tme_sun_sc_card,
        !           746:                            sun_sc->tme_sun_sc_device.tme_bus_device_address_last);
        !           747: 
        !           748:   /* put back the old data register, but get any value that
        !           749:      may have been written: */
        !           750:   data_new
        !           751:     = (is_cmd_stat
        !           752:        ? sun_sc->tme_sun_sc_card[TME_SUN_SC_REG_CMD_STAT]
        !           753:        : sun_sc->tme_sun_sc_card[TME_SUN_SC_REG_DATA]);
        !           754:   sun_sc->tme_sun_sc_card[TME_SUN_SC_REG_DATA] = data_old;
        !           755: 
        !           756:   /* if this was a read or write of the cmd_stat register, or a read
        !           757:      or write of the data register while the bus is in the DATA IN or
        !           758:      DATA OUT phase with REQ asserted, do the initiator's side of the
        !           759:      REQ/ACK handshake: */
        !           760:   if (is_cmd_stat
        !           761:       || ((icr
        !           762:           & (TME_SUN_SC_ICR_BUSY
        !           763:              | TME_SUN_SC_ICR_MESSAGE
        !           764:              | TME_SUN_SC_ICR_COMMAND_DATA
        !           765:              | TME_SUN_SC_ICR_REQUEST))
        !           766:          == (TME_SUN_SC_ICR_BUSY
        !           767:              | TME_SUN_SC_ICR_REQUEST))) {
        !           768:     
        !           769:     /* make a new SCSI bus cycle: */
        !           770:     /* XXX parity? */
        !           771:     sun_sc_cycle
        !           772:       = _tme_sun_sc_cycle_new(sun_sc,
        !           773:                              sun_sc->tme_sun_sc_sequence_info_dma_initiator);
        !           774:     sun_sc_cycle->tme_sun_sc_cycle_dma.tme_scsi_dma_resid
        !           775:       = sizeof(sun_sc_cycle->tme_sun_sc_cycle_cmd_stat);
        !           776:     sun_sc_cycle->tme_sun_sc_cycle_dma.tme_scsi_dma_in
        !           777:       = &sun_sc_cycle->tme_sun_sc_cycle_cmd_stat;
        !           778:     sun_sc_cycle->tme_sun_sc_cycle_dma.tme_scsi_dma_out
        !           779:       = &sun_sc_cycle->tme_sun_sc_cycle_cmd_stat;
        !           780:     sun_sc_cycle->tme_sun_sc_cycle_cmd_stat
        !           781:       = data_new;
        !           782: 
        !           783:     tme_log(&sun_sc->tme_sun_sc_element->tme_element_log_handle,
        !           784:            100, TME_OK,
        !           785:            (&sun_sc->tme_sun_sc_element->tme_element_log_handle,
        !           786:             ((cycle_init->tme_bus_cycle_type
        !           787:               == TME_BUS_CYCLE_WRITE)
        !           788:              ? (is_cmd_stat
        !           789:                 ? "0x%02x -> cmd_stat"
        !           790:                 : "0x%02x -> data (handshake)")
        !           791:              : (is_cmd_stat
        !           792:                 ? "cmd_stat-> 0x%02x"
        !           793:                 : "data -> 0x%02x (handshake)")),
        !           794:             sun_sc_cycle->tme_sun_sc_cycle_cmd_stat));
        !           795:     
        !           796:     new_callouts |= TME_SUN_SC_CALLOUT_CYCLE;
        !           797: 
        !           798:     /* since this SCSI DMA sequence won't be run right away, it's
        !           799:        important that we clear REQ now - otherwise if the sc device
        !           800:        driver happens to see REQ still set, it will think that the SCSI
        !           801:        handshake *did* happen, and that this REQ is now requesting the
        !           802:        next byte.  when the DMA sequence ends we'll get a cycle call
        !           803:        that will bring us up-to-date: */
        !           804:     TME_SUN_SC_ICR_PUT(sun_sc,
        !           805:                       (icr
        !           806:                        & ~TME_SUN_SC_ICR_REQUEST));
        !           807:   }
        !           808: 
        !           809:   /* otherwise, if this was a write of the data register in a 
        !           810:      non-handshake bus phase: */
        !           811:   else if (cycle_init->tme_bus_cycle_type
        !           812:           == TME_BUS_CYCLE_WRITE) {
        !           813: 
        !           814:     /* if the data signals that we are asserting have changed, call
        !           815:        out a cycle, then wait: */
        !           816:     sun_sc_cycle
        !           817:       = &sun_sc->tme_sun_sc_cycles[((sun_sc->tme_sun_sc_cycle_head
        !           818:                                     - 1)
        !           819:                                    & (TME_SUN_SC_CYCLE_RING_SIZE
        !           820:                                       - 1))];
        !           821:     if (data_new != sun_sc_cycle->tme_sun_sc_cycle_data) {
        !           822:       tme_log(&sun_sc->tme_sun_sc_element->tme_element_log_handle,
        !           823:              100, TME_OK,
        !           824:              (&sun_sc->tme_sun_sc_element->tme_element_log_handle,
        !           825:               "0x%02x -> data (no handshake)",
        !           826:               data_new));
        !           827:       sun_sc_cycle
        !           828:        = _tme_sun_sc_cycle_new(sun_sc,
        !           829:                                sun_sc->tme_sun_sc_sequence_wait_change);
        !           830:       sun_sc_cycle->tme_sun_sc_cycle_data
        !           831:        = data_new;
        !           832:       new_callouts
        !           833:        |= TME_SUN_SC_CALLOUT_CYCLE;
        !           834:     }
        !           835:   }
        !           836: 
        !           837:   /* otherwise, this was a read of the data register in a
        !           838:      non-handshake bus phase: */
        !           839:   else {
        !           840:     tme_log(&sun_sc->tme_sun_sc_element->tme_element_log_handle,
        !           841:            100, TME_OK,
        !           842:            (&sun_sc->tme_sun_sc_element->tme_element_log_handle,
        !           843:             "data -> 0x%02x (no handshake)",
        !           844:             data_old));
        !           845:   }
        !           846:     
        !           847:   /* make any new callouts: */
        !           848:   _tme_sun_sc_callout(sun_sc, new_callouts);
        !           849: 
        !           850:   /* unlock the mutex: */
        !           851:   tme_mutex_unlock(&sun_sc->tme_sun_sc_mutex);
        !           852: 
        !           853:   /* no faults: */
        !           854:   return (TME_OK);
        !           855: }
        !           856: 
        !           857: /* the Sun sc bus cycle handler for the data register.  this register
        !           858:    is connected directly to the SCSI data signals: */
        !           859: static int
        !           860: _tme_sun_sc_bus_cycle_data(void *_sun_sc,
        !           861:                           struct tme_bus_cycle *cycle_init)
        !           862: {
        !           863:   return (_tme_sun_sc_bus_cycle_data_reg((struct tme_sun_sc *) _sun_sc,
        !           864:                                         cycle_init,
        !           865:                                         FALSE));
        !           866: }
        !           867: 
        !           868: /* the Sun sc bus cycle handler for the command/status register.  this
        !           869:    register is also connected directly to the SCSI data signals, but
        !           870:    reading or writing it additionally causes the card to execute the
        !           871:    initiator's side of a REQ/ACK handshake to transfer a byte: */
        !           872: static int
        !           873: _tme_sun_sc_bus_cycle_cmd_stat(void *_sun_sc,
        !           874:                               struct tme_bus_cycle *cycle_init)
        !           875: {
        !           876:   return (_tme_sun_sc_bus_cycle_data_reg((struct tme_sun_sc *) _sun_sc,
        !           877:                                         cycle_init,
        !           878:                                         TRUE));
        !           879: }
        !           880: 
        !           881: /* this tries to start or continue a DMA transfer: */
        !           882: static int
        !           883: _tme_sun_sc_dma_start(struct tme_sun_sc *sun_sc,
        !           884:                      tme_uint16_t *_icr)
        !           885: {
        !           886:   tme_uint16_t icr;
        !           887:   tme_uint16_t resid;
        !           888: 
        !           889:   /* get the current ICR value: */
        !           890:   icr = *_icr;
        !           891: 
        !           892:   /* get the resid: */
        !           893:   resid
        !           894:     = (TME_SUN_SC_REG16_GET(sun_sc,
        !           895:                            TME_SUN_SC_REG_DMA_LEN)
        !           896:        ^ 0xffff);
        !           897:   
        !           898:   tme_log(&sun_sc->tme_sun_sc_element->tme_element_log_handle,
        !           899:          100, TME_OK,
        !           900:          (&sun_sc->tme_sun_sc_element->tme_element_log_handle,
        !           901:           "dma_start: icr=0x%04x dvma=0x%04x%04x len=0x%04x",
        !           902:           icr,
        !           903:           TME_SUN_SC_REG16_GET(sun_sc,
        !           904:                                TME_SUN_SC_REG_DMA_H),
        !           905:           TME_SUN_SC_REG16_GET(sun_sc,
        !           906:                                TME_SUN_SC_REG_DMA_L),
        !           907:           resid));
        !           908: 
        !           909:   /* if we're not in the DATA IN or DATA OUT phases, do nothing.  the
        !           910:      sun2 PROMs seem to set DMA_ENABLE when DMA is impossible: */
        !           911:   if ((icr
        !           912:        & (TME_SUN_SC_ICR_DMA_ENABLE
        !           913:          | TME_SUN_SC_ICR_BUSY
        !           914:          | TME_SUN_SC_ICR_MESSAGE
        !           915:          | TME_SUN_SC_ICR_COMMAND_DATA
        !           916:          | TME_SUN_SC_ICR_REQUEST))
        !           917:       != (TME_SUN_SC_ICR_DMA_ENABLE
        !           918:          | TME_SUN_SC_ICR_BUSY
        !           919:          | TME_SUN_SC_ICR_REQUEST)) {
        !           920:     return (TME_SUN_SC_CALLOUT_CHECK);
        !           921:   }
        !           922:   
        !           923:   /* if there are no more bytes left to transfer, we need
        !           924:      an interrupt: */
        !           925:   if (resid == 0) {
        !           926:     *_icr
        !           927:       = ((icr
        !           928:          & ~TME_SUN_SC_ICR_ODD_LENGTH) 
        !           929:         | TME_SUN_SC_ICR_INT_REQUEST);
        !           930:     return (TME_SUN_SC_CALLOUT_INT);
        !           931:   }
        !           932: 
        !           933:   /* if there is only one byte left to transfer, and we're in word
        !           934:      mode, note the odd byte, and we need an interrupt: */
        !           935:   else if (resid == 1
        !           936:           && (icr
        !           937:               & TME_SUN_SC_ICR_WORD_MODE)) {
        !           938:     *_icr
        !           939:       = (icr
        !           940:         | TME_SUN_SC_ICR_ODD_LENGTH
        !           941:         | TME_SUN_SC_ICR_INT_REQUEST);
        !           942:     return (TME_SUN_SC_CALLOUT_INT);
        !           943:   }
        !           944: 
        !           945:   /* otherwise, start the DMA transfer with a TLB fill callout: */
        !           946:   return (TME_SUN_SC_CALLOUT_TLB_FILL);
        !           947: }
        !           948: 
        !           949: /* the Sun sc bus cycle handler for the ICR.  parts of this register
        !           950:    are connected directly to the SCSI control signals: */
        !           951: static int
        !           952: _tme_sun_sc_bus_cycle_icr(void *_sun_sc,
        !           953:                          struct tme_bus_cycle *cycle_init)
        !           954: {
        !           955:   struct tme_sun_sc *sun_sc;
        !           956:   struct tme_sun_sc_cycle *sun_sc_cycle;
        !           957:   tme_uint16_t icr_old, icr_new, icr_diff;
        !           958:   int new_callouts;
        !           959: 
        !           960:   /* recover our data structure: */
        !           961:   sun_sc = (struct tme_sun_sc *) _sun_sc;
        !           962: 
        !           963:   /* assume we won't need any new callouts: */
        !           964:   new_callouts = 0;
        !           965: 
        !           966:   /* lock the mutex: */
        !           967:   tme_mutex_lock(&sun_sc->tme_sun_sc_mutex);
        !           968: 
        !           969:   /* save the old ICR value: */
        !           970:   icr_old = TME_SUN_SC_ICR_GET(sun_sc);
        !           971:   icr_new = icr_old;
        !           972: 
        !           973:   /* if we were requesting an interrupt, clear it now and call out an
        !           974:      interrupt change: */
        !           975:   if (icr_new & TME_SUN_SC_ICR_INT_REQUEST) {
        !           976:     icr_new &= ~TME_SUN_SC_ICR_INT_REQUEST;
        !           977:     new_callouts |= TME_SUN_SC_CALLOUT_INT;
        !           978:   }
        !           979: 
        !           980:   /* run the bus cycle: */
        !           981:   tme_bus_cycle_xfer_memory(cycle_init, 
        !           982:                            sun_sc->tme_sun_sc_card,
        !           983:                            sun_sc->tme_sun_sc_device.tme_bus_device_address_last);
        !           984: 
        !           985: 
        !           986:   /* if this was a write: */
        !           987:   if (cycle_init->tme_bus_cycle_type
        !           988:       == TME_BUS_CYCLE_WRITE) {
        !           989: 
        !           990:     /* put back the read-only bits: */
        !           991:     icr_new = TME_SUN_SC_ICR_GET(sun_sc);
        !           992:     icr_new = ((icr_old
        !           993:                & _TME_SUN_SC_ICR_RO_BITS)
        !           994:               | (icr_new
        !           995:                  & ~_TME_SUN_SC_ICR_RO_BITS));
        !           996:     
        !           997:     /* get the set of changed bits: */
        !           998:     icr_diff = icr_old ^ icr_new;
        !           999:     
        !          1000:     /* a change in RESET: */
        !          1001:     if (icr_diff & TME_SUN_SC_ICR_RESET) {
        !          1002:       
        !          1003:       /* make a new cycle that asserts no data or control signals,
        !          1004:         except possibly for RST: */
        !          1005:       sun_sc_cycle
        !          1006:        = _tme_sun_sc_cycle_new(sun_sc,
        !          1007:                                sun_sc->tme_sun_sc_sequence_wait_change);
        !          1008:       sun_sc_cycle->tme_sun_sc_cycle_control
        !          1009:        = ((icr_new
        !          1010:            & TME_SUN_SC_ICR_RESET)
        !          1011:           ? TME_SCSI_SIGNAL_RST
        !          1012:           : 0);
        !          1013:       sun_sc_cycle->tme_sun_sc_cycle_data
        !          1014:        = 0;
        !          1015:       new_callouts
        !          1016:        |= TME_SUN_SC_CALLOUT_CYCLE;
        !          1017:     }
        !          1018:     
        !          1019:     /* a change in SELECT: */
        !          1020:     else if (icr_diff & TME_SUN_SC_ICR_SELECT) {
        !          1021:       
        !          1022:       /* make a new cycle that sets the new state of SEL: */
        !          1023:       sun_sc_cycle
        !          1024:        = _tme_sun_sc_cycle_new(sun_sc,
        !          1025:                                sun_sc->tme_sun_sc_sequence_wait_change);
        !          1026:       sun_sc_cycle->tme_sun_sc_cycle_control
        !          1027:        = ((sun_sc_cycle->tme_sun_sc_cycle_control
        !          1028:            & ~TME_SCSI_SIGNAL_SEL)
        !          1029:           | ((icr_new
        !          1030:               & TME_SUN_SC_ICR_SELECT)
        !          1031:              ? TME_SCSI_SIGNAL_SEL
        !          1032:              : 0));
        !          1033:       new_callouts
        !          1034:        |= TME_SUN_SC_CALLOUT_CYCLE;
        !          1035:     }
        !          1036:     
        !          1037:     /* if DMA_ENABLE is now set: */
        !          1038:     if (icr_diff
        !          1039:        & icr_new
        !          1040:        & TME_SUN_SC_ICR_DMA_ENABLE) {
        !          1041:       
        !          1042:       /* try to start DMA: */
        !          1043:       new_callouts
        !          1044:        |= _tme_sun_sc_dma_start(sun_sc,
        !          1045:                                 &icr_new);
        !          1046:     }
        !          1047:     
        !          1048:     /* a change in INT_ENABLE: */
        !          1049:     if (icr_diff
        !          1050:        & icr_new
        !          1051:        & TME_SUN_SC_ICR_INT_ENABLE) {
        !          1052:       
        !          1053:       /* our interrupt signal may be changing: */
        !          1054:       new_callouts |= TME_SUN_SC_CALLOUT_INT;
        !          1055:     }
        !          1056:   }
        !          1057: 
        !          1058:   /* if the ICR changed, save and log the new value: */
        !          1059:   if (icr_new != icr_old) {
        !          1060:     TME_SUN_SC_ICR_PUT(sun_sc, icr_new);
        !          1061:   }
        !          1062: 
        !          1063:   /* make any new callouts: */
        !          1064:   _tme_sun_sc_callout(sun_sc, new_callouts);
        !          1065: 
        !          1066:   /* unlock the mutex: */
        !          1067:   tme_mutex_unlock(&sun_sc->tme_sun_sc_mutex);
        !          1068: 
        !          1069:   /* no faults: */
        !          1070:   return (TME_OK);
        !          1071: }
        !          1072: 
        !          1073: /* the Sun sc bus cycle handler for other card registers: */
        !          1074: static int
        !          1075: _tme_sun_sc_bus_cycle_other(void *_sun_sc,
        !          1076:                            struct tme_bus_cycle *cycle_init)
        !          1077: {
        !          1078:   struct tme_sun_sc *sun_sc;
        !          1079: 
        !          1080:   /* recover our data structure: */
        !          1081:   sun_sc = (struct tme_sun_sc *) _sun_sc;
        !          1082: 
        !          1083:   /* lock the mutex: */
        !          1084:   tme_mutex_lock(&sun_sc->tme_sun_sc_mutex);
        !          1085: 
        !          1086:   /* run the bus cycle: */
        !          1087:   tme_bus_cycle_xfer_memory(cycle_init, 
        !          1088:                            sun_sc->tme_sun_sc_card,
        !          1089:                            sun_sc->tme_sun_sc_device.tme_bus_device_address_last);
        !          1090: 
        !          1091:   /* if this was a write, dump out the other registers: */
        !          1092:   if (cycle_init->tme_bus_cycle_type
        !          1093:       == TME_BUS_CYCLE_WRITE) {
        !          1094:     tme_log(&sun_sc->tme_sun_sc_element->tme_element_log_handle,
        !          1095:            100, TME_OK,
        !          1096:            (&sun_sc->tme_sun_sc_element->tme_element_log_handle,
        !          1097:             "dvma=0x%04x%04x len=0x%04x",
        !          1098:             TME_SUN_SC_REG16_GET(sun_sc,
        !          1099:                                  TME_SUN_SC_REG_DMA_H),
        !          1100:             TME_SUN_SC_REG16_GET(sun_sc,
        !          1101:                                  TME_SUN_SC_REG_DMA_L),
        !          1102:             (TME_SUN_SC_REG16_GET(sun_sc,
        !          1103:                                   TME_SUN_SC_REG_DMA_LEN)
        !          1104:              ^ 0xffff)));
        !          1105:   }
        !          1106: 
        !          1107:   /* unlock the mutex: */
        !          1108:   tme_mutex_unlock(&sun_sc->tme_sun_sc_mutex);
        !          1109: 
        !          1110:   /* no faults: */
        !          1111:   return (TME_OK);
        !          1112: }
        !          1113: 
        !          1114: /* the Sun sc TLB filler: */
        !          1115: static int
        !          1116: _tme_sun_sc_tlb_fill(void *_sun_sc, 
        !          1117:                     struct tme_bus_tlb *tlb, 
        !          1118:                     tme_bus_addr_t address,
        !          1119:                     unsigned int cycles)
        !          1120: {
        !          1121:   struct tme_sun_sc *sun_sc;
        !          1122: 
        !          1123:   /* recover our data structure: */
        !          1124:   sun_sc = (struct tme_sun_sc *) _sun_sc;
        !          1125: 
        !          1126:   /* the address must be within range: */
        !          1127:   assert(address < TME_SUN_SC_SIZ_CARD);
        !          1128: 
        !          1129:   /* initialize the TLB entry: */
        !          1130:   tme_bus_tlb_initialize(tlb);
        !          1131: 
        !          1132: #define TME_SUN_SC_TLB_REG(reg, siz, handler, rd)\
        !          1133: do {                                           \
        !          1134:                                                \
        !          1135:   /* if this address falls in this register: */        \
        !          1136:   if (((reg)                                   \
        !          1137:        <= address)                             \
        !          1138:       && (address                              \
        !          1139:          < ((reg)                              \
        !          1140:             + (siz)))) {                       \
        !          1141:                                                \
        !          1142:     /* this TLB entry covers this register: */ \
        !          1143:     TME_ATOMIC_WRITE(tme_bus_addr_t,           \
        !          1144:                     tlb->tme_bus_tlb_addr_first,\
        !          1145:                     (reg));                    \
        !          1146:     TME_ATOMIC_WRITE(tme_bus_addr_t,           \
        !          1147:                     tlb->tme_bus_tlb_addr_last,\
        !          1148:                     ((reg)                     \
        !          1149:                      + (siz)                   \
        !          1150:                      - 1));                    \
        !          1151:                                                \
        !          1152:     /* our bus cycle handler: */               \
        !          1153:     tlb->tme_bus_tlb_cycle = (handler);                \
        !          1154:                                                \
        !          1155:     /* if this TLB entry allows fast reading: */\
        !          1156:     if (rd) {                                  \
        !          1157:       tlb->tme_bus_tlb_emulator_off_read       \
        !          1158:          = &sun_sc->tme_sun_sc_card[0];                \
        !          1159:     }                                          \
        !          1160:   }                                            \
        !          1161: } while (/* CONSTCOND */ 0)
        !          1162: 
        !          1163:   TME_SUN_SC_TLB_REG(TME_SUN_SC_REG_DATA,
        !          1164:                     TME_SUN_SC_SIZ_DATA,
        !          1165:                     _tme_sun_sc_bus_cycle_data,
        !          1166:                     FALSE);
        !          1167:   TME_SUN_SC_TLB_REG(TME_SUN_SC_REG_CMD_STAT,
        !          1168:                     TME_SUN_SC_SIZ_CMD_STAT,
        !          1169:                     _tme_sun_sc_bus_cycle_cmd_stat,
        !          1170:                     FALSE);
        !          1171:   TME_SUN_SC_TLB_REG(TME_SUN_SC_REG_ICR,
        !          1172:                     TME_SUN_SC_SIZ_ICR,
        !          1173:                     _tme_sun_sc_bus_cycle_icr,
        !          1174:                     TRUE);
        !          1175: #undef TME_SUN_SC_TLB_REG
        !          1176: 
        !          1177:   /* anything else is some other register: */
        !          1178:   if (tlb->tme_bus_tlb_cycle == NULL) {
        !          1179: 
        !          1180:     /* if this address is past the ICR, this TLB entry covers from
        !          1181:        past the ICR to the end of the card, else this TLB entry covers
        !          1182:        the byte at this address only: */
        !          1183:     if (address
        !          1184:        >= (TME_SUN_SC_REG_ICR
        !          1185:            + TME_SUN_SC_SIZ_ICR)) {
        !          1186:       TME_ATOMIC_WRITE(tme_bus_addr_t,
        !          1187:                       tlb->tme_bus_tlb_addr_first,
        !          1188:                       (TME_SUN_SC_REG_ICR
        !          1189:                        + TME_SUN_SC_SIZ_ICR));
        !          1190:       TME_ATOMIC_WRITE(tme_bus_addr_t,
        !          1191:                       tlb->tme_bus_tlb_addr_last,
        !          1192:                       TME_SUN_SC_SIZ_CARD - 1);
        !          1193:     }
        !          1194:     else {
        !          1195:       TME_ATOMIC_WRITE(tme_bus_addr_t,
        !          1196:                       tlb->tme_bus_tlb_addr_first,
        !          1197:                       address);
        !          1198:       TME_ATOMIC_WRITE(tme_bus_addr_t,
        !          1199:                       tlb->tme_bus_tlb_addr_last,
        !          1200:                       address);
        !          1201:     }
        !          1202: 
        !          1203:     /* this TLB entry allows fast reading and writing: */
        !          1204:     tlb->tme_bus_tlb_emulator_off_read
        !          1205:       = &sun_sc->tme_sun_sc_card[0];
        !          1206:     tlb->tme_bus_tlb_emulator_off_write
        !          1207:       = &sun_sc->tme_sun_sc_card[0];
        !          1208: 
        !          1209:     /* bus cycles are handled by the other handler: */
        !          1210:     tlb->tme_bus_tlb_cycle = _tme_sun_sc_bus_cycle_other;
        !          1211:   }
        !          1212: 
        !          1213: #ifdef TME_SUN_SC_DEBUG
        !          1214:   /* XXX when debugging, nothing is fast readable or writable: */
        !          1215:   tlb->tme_bus_tlb_emulator_off_read
        !          1216:     = TME_EMULATOR_OFF_UNDEF;
        !          1217:   tlb->tme_bus_tlb_emulator_off_write
        !          1218:     = TME_EMULATOR_OFF_UNDEF;
        !          1219: #endif /* TME_SUN_SC_DEBUG */
        !          1220: 
        !          1221:   /* in case this TLB entry allows fast access: */
        !          1222:   tlb->tme_bus_tlb_rwlock = &sun_sc->tme_sun_sc_rwlock;
        !          1223: 
        !          1224:   /* allow reading and writing: */
        !          1225:   tlb->tme_bus_tlb_cycles_ok = TME_BUS_CYCLE_READ | TME_BUS_CYCLE_WRITE;
        !          1226: 
        !          1227:   /* our bus cycle handler private data: */
        !          1228:   tlb->tme_bus_tlb_cycle_private = sun_sc;
        !          1229: 
        !          1230:   return (TME_OK);
        !          1231: }
        !          1232: 
        !          1233: /* this is called for an event on the SCSI bus: */
        !          1234: static int
        !          1235: _tme_sun_sc_scsi_cycle(struct tme_scsi_connection *conn_scsi,
        !          1236:                       tme_scsi_control_t control,
        !          1237:                       tme_scsi_data_t data,
        !          1238:                       _tme_const struct tme_scsi_sequence *sequence,
        !          1239:                       struct tme_scsi_dma *dma)
        !          1240: {
        !          1241:   struct tme_sun_sc *sun_sc;
        !          1242:   struct tme_sun_sc_cycle *sun_sc_cycle;
        !          1243:   unsigned long count;
        !          1244:   struct tme_bus_tlb *tlb;
        !          1245:   tme_uint32_t address;
        !          1246:   tme_uint16_t resid;
        !          1247:   tme_uint16_t icr_old, icr_new;
        !          1248:   int new_callouts;
        !          1249:   int new_callouts_dma;
        !          1250:   int rc;
        !          1251:   
        !          1252:   /* recover our data structure: */
        !          1253:   sun_sc = conn_scsi->tme_scsi_connection.tme_connection_element->tme_element_private;
        !          1254: 
        !          1255:   /* assume we won't need any new callouts: */
        !          1256:   new_callouts = 0;
        !          1257: 
        !          1258:   /* lock the mutex: */
        !          1259:   tme_mutex_lock(&sun_sc->tme_sun_sc_mutex);
        !          1260: 
        !          1261:   /* get the old ICR value: */
        !          1262:   icr_old = TME_SUN_SC_ICR_GET(sun_sc);
        !          1263:   
        !          1264:   /* update the ICR to reflect the current SCSI control signals: */
        !          1265:   icr_new = icr_old;
        !          1266: #define _TME_SUN_SC_ICR_CONTROL(_icr, _control) \
        !          1267: do {                                           \
        !          1268:   if (control & _control) {                    \
        !          1269:     icr_new |= _icr;                           \
        !          1270:   }                                            \
        !          1271:   else {                                       \
        !          1272:     icr_new &= ~_icr;                          \
        !          1273:   }                                            \
        !          1274: } while (/* CONSTCOND */ 0)
        !          1275:   _TME_SUN_SC_ICR_CONTROL(TME_SUN_SC_ICR_REQUEST,
        !          1276:                          TME_SCSI_SIGNAL_REQ);
        !          1277:   _TME_SUN_SC_ICR_CONTROL(TME_SUN_SC_ICR_MESSAGE,
        !          1278:                          TME_SCSI_SIGNAL_MSG);
        !          1279:   _TME_SUN_SC_ICR_CONTROL(TME_SUN_SC_ICR_COMMAND_DATA,
        !          1280:                          TME_SCSI_SIGNAL_C_D);
        !          1281:   _TME_SUN_SC_ICR_CONTROL(TME_SUN_SC_ICR_INPUT_OUTPUT,
        !          1282:                          TME_SCSI_SIGNAL_I_O);
        !          1283:   _TME_SUN_SC_ICR_CONTROL(TME_SUN_SC_ICR_PARITY,
        !          1284:                          TME_SCSI_SIGNAL_DBP);
        !          1285:   _TME_SUN_SC_ICR_CONTROL(TME_SUN_SC_ICR_BUSY,
        !          1286:                          TME_SCSI_SIGNAL_BSY);
        !          1287: #undef _TME_SUN_SC_ICR_CONTROL
        !          1288: 
        !          1289:   /* if the bus phase has changed to the STATUS phase, call out an
        !          1290:      interrupt: */
        !          1291:   /* XXX is this really how the board behaves? the sun2 PROM seems to
        !          1292:      rely on this behavior: */
        !          1293:   if ((TME_SUN_SC_BUS_PHASE(icr_new)
        !          1294:        != TME_SUN_SC_BUS_PHASE(icr_old))
        !          1295:       && (TME_SUN_SC_BUS_PHASE(icr_new)
        !          1296:          == (TME_SUN_SC_ICR_BUSY
        !          1297:              | TME_SUN_SC_ICR_COMMAND_DATA
        !          1298:              | TME_SUN_SC_ICR_INPUT_OUTPUT))) {
        !          1299:     icr_new
        !          1300:       |= TME_SUN_SC_ICR_INT_REQUEST;
        !          1301:     new_callouts
        !          1302:       |= TME_SUN_SC_CALLOUT_INT;
        !          1303:   }
        !          1304: 
        !          1305:   /* get the last SCSI cycle that we called out: */
        !          1306:   sun_sc_cycle
        !          1307:     = &sun_sc->tme_sun_sc_cycles[sun_sc->tme_sun_sc_cycle_tail];
        !          1308: 
        !          1309:   /* if the last SCSI cycle was for a DMA sequence: */
        !          1310:   if (sun_sc_cycle->tme_sun_sc_cycle_sequence
        !          1311:       == sun_sc->tme_sun_sc_sequence_info_dma_initiator) {
        !          1312: 
        !          1313:     /* if the last SCSI cycle was for a genuine DMA sequence (as opposed
        !          1314:        to a DMA sequence to transfer the cmd_stat register), update the
        !          1315:        card's DMA engine registers: */
        !          1316:     if ((sun_sc_cycle->tme_sun_sc_cycle_dma.tme_scsi_dma_out
        !          1317:         != &sun_sc_cycle->tme_sun_sc_cycle_cmd_stat)
        !          1318:        && (sun_sc_cycle->tme_sun_sc_cycle_dma.tme_scsi_dma_in
        !          1319:            != &sun_sc_cycle->tme_sun_sc_cycle_cmd_stat)) {
        !          1320: 
        !          1321:       /* get the number of bytes that were transferred: */
        !          1322:       count
        !          1323:        = ((sun_sc_cycle->tme_sun_sc_cycle_dma.tme_scsi_dma_out
        !          1324:            > sun_sc_cycle->tme_sun_sc_cycle_dma.tme_scsi_dma_in)
        !          1325:           ? (sun_sc_cycle->tme_sun_sc_cycle_dma.tme_scsi_dma_out
        !          1326:              - sun_sc_cycle->tme_sun_sc_cycle_dma.tme_scsi_dma_in)
        !          1327:           : (sun_sc_cycle->tme_sun_sc_cycle_dma.tme_scsi_dma_in
        !          1328:              - sun_sc_cycle->tme_sun_sc_cycle_dma.tme_scsi_dma_out));
        !          1329:       
        !          1330:       /* get the TLB entry: */
        !          1331:       tlb
        !          1332:        = TME_ATOMIC_READ(struct tme_bus_tlb *,
        !          1333:                          sun_sc->tme_sun_sc_dma_tlb);
        !          1334:       
        !          1335:       /* get the DMA address: */
        !          1336:       address
        !          1337:        = TME_SUN_SC_REG16_GET(sun_sc,
        !          1338:                               TME_SUN_SC_REG_DMA_H);
        !          1339:       address
        !          1340:        = ((address
        !          1341:            << 16)
        !          1342:           | TME_SUN_SC_REG16_GET(sun_sc,
        !          1343:                                  TME_SUN_SC_REG_DMA_L));
        !          1344: 
        !          1345:       /* if we were doing a DMA write, but the TLB entry we filled
        !          1346:         doesn't allow fast writing, we need to do a memory write
        !          1347:         cycle to transfer the bytes from our internal DMA buffer into
        !          1348:         memory: */
        !          1349:       if ((icr_old
        !          1350:           & TME_SUN_SC_ICR_INPUT_OUTPUT)
        !          1351:          && (tlb->tme_bus_tlb_emulator_off_write
        !          1352:              == TME_EMULATOR_OFF_UNDEF)) {
        !          1353:        rc = _tme_sun_sc_bus_cycle_dma(sun_sc,
        !          1354:                                       tlb,
        !          1355:                                       TME_BUS_CYCLE_WRITE,
        !          1356:                                       address,
        !          1357:                                       (icr_old
        !          1358:                                        & TME_SUN_SC_ICR_WORD_MODE));
        !          1359:        assert (rc == TME_OK);
        !          1360:       }
        !          1361:       
        !          1362:       /* update the DMA address: */
        !          1363:       address += count;
        !          1364:       TME_SUN_SC_REG16_PUT(sun_sc,
        !          1365:                           TME_SUN_SC_REG_DMA_H,
        !          1366:                           address >> 16);
        !          1367:       TME_SUN_SC_REG16_PUT(sun_sc,
        !          1368:                           TME_SUN_SC_REG_DMA_L,
        !          1369:                           address & 0xffff);
        !          1370:       
        !          1371:       /* update the DMA length: */
        !          1372:       resid
        !          1373:        = (TME_SUN_SC_REG16_GET(sun_sc,
        !          1374:                                TME_SUN_SC_REG_DMA_LEN)
        !          1375:           ^ 0xffff);
        !          1376:       assert (resid >= count);
        !          1377:       TME_SUN_SC_REG16_PUT(sun_sc,
        !          1378:                           TME_SUN_SC_REG_DMA_LEN,
        !          1379:                           ((resid
        !          1380:                             - count)
        !          1381:                            ^ 0xffff));
        !          1382:       
        !          1383:       /* XXX this idea doesn't work because the initiator can't know
        !          1384:         the amount of data returned by some commands, like REQUEST
        !          1385:         SENSE.  when does this card signal BUS_ERROR, then? */
        !          1386: #if 0
        !          1387:       /* if the DMA sequence didn't transfer all of the DMA bytes that
        !          1388:         we had made available, that usually means that the SCSI bus
        !          1389:         phase changed in the middle of the transfer, which is a bus
        !          1390:         error: */
        !          1391:       if (sun_sc_cycle->tme_sun_sc_cycle_dma.tme_scsi_dma_resid
        !          1392:          > 0) {
        !          1393:        
        !          1394:        /* note the bus error and request an interrupt: */
        !          1395:        icr_new
        !          1396:          |= (TME_SUN_SC_ICR_BUS_ERROR
        !          1397:              | TME_SUN_SC_ICR_INT_REQUEST);
        !          1398:        new_callouts |= TME_SUN_SC_CALLOUT_INT;
        !          1399:       }
        !          1400: #endif
        !          1401:     }
        !          1402: 
        !          1403:     /* advance the tail pointer: */
        !          1404:     sun_sc->tme_sun_sc_cycle_tail
        !          1405:       = ((sun_sc->tme_sun_sc_cycle_tail
        !          1406:          + 1)
        !          1407:         & (TME_SUN_SC_CYCLE_RING_SIZE
        !          1408:            - 1));
        !          1409:   }
        !          1410: 
        !          1411:   /* always try to start or continue a DMA transfer.  if one
        !          1412:      can't be started, just wait for another SCSI bus change: */
        !          1413:   new_callouts_dma
        !          1414:     = _tme_sun_sc_dma_start(sun_sc,
        !          1415:                            &icr_new);
        !          1416:   if (new_callouts_dma != 0) {
        !          1417:     new_callouts |= new_callouts_dma;
        !          1418:   }
        !          1419:   else {
        !          1420:     sun_sc_cycle
        !          1421:       = _tme_sun_sc_cycle_new(sun_sc,
        !          1422:                              sun_sc->tme_sun_sc_sequence_wait_change);
        !          1423:     new_callouts
        !          1424:       |= TME_SUN_SC_CALLOUT_CYCLE;
        !          1425:   }
        !          1426:   
        !          1427:   /* update the ICR and data registers: */
        !          1428:   TME_SUN_SC_ICR_PUT(sun_sc, icr_new);
        !          1429:   sun_sc->tme_sun_sc_card[TME_SUN_SC_REG_DATA] = data;
        !          1430: 
        !          1431:   /* make any new callouts: */
        !          1432:   _tme_sun_sc_callout(sun_sc, new_callouts);
        !          1433: 
        !          1434:   /* unlock the mutex: */
        !          1435:   tme_mutex_unlock(&sun_sc->tme_sun_sc_mutex);
        !          1436: 
        !          1437:   return (TME_OK);
        !          1438: }
        !          1439: 
        !          1440: /* this makes a new bus connection: */
        !          1441: static int
        !          1442: _tme_sun_sc_connection_make_bus(struct tme_connection *conn,
        !          1443:                                unsigned int state)
        !          1444: {
        !          1445:   struct tme_sun_sc *sun_sc;
        !          1446:   struct tme_bus_connection *conn_bus;
        !          1447:   int rc;
        !          1448: 
        !          1449:   /* recover our data structure: */
        !          1450:   sun_sc = conn->tme_connection_element->tme_element_private;
        !          1451: 
        !          1452:   /* call the bus device connection maker: */
        !          1453:   rc = tme_bus_device_connection_make(conn, state);
        !          1454: 
        !          1455:   /* if the full connection was successful, and we don't have a TLB
        !          1456:      set yet, allocate it: */
        !          1457:   if (rc == TME_OK
        !          1458:       && state == TME_CONNECTION_FULL
        !          1459:       && TME_ATOMIC_READ(struct tme_bus_tlb *,
        !          1460:                         sun_sc->tme_sun_sc_dma_tlb) == NULL) {
        !          1461: 
        !          1462:     /* get our bus connection: */
        !          1463:     conn_bus
        !          1464:       = TME_ATOMIC_READ(struct tme_bus_connection *,
        !          1465:                        sun_sc->tme_sun_sc_device.tme_bus_device_connection);
        !          1466: 
        !          1467:     /* allocate the TLB set: */
        !          1468:     rc = ((*conn_bus->tme_bus_tlb_set_allocate)
        !          1469:          (conn_bus,
        !          1470:           1, 
        !          1471:           sizeof(struct tme_bus_tlb),
        !          1472:           TME_ATOMIC_POINTER(&sun_sc->tme_sun_sc_dma_tlb)));
        !          1473:     assert (rc == TME_OK);
        !          1474:   }
        !          1475: 
        !          1476:   return (rc);
        !          1477: }
        !          1478: 
        !          1479: /* this makes a new SCSI connection: */
        !          1480: static int
        !          1481: _tme_sun_sc_connection_make_scsi(struct tme_connection *conn,
        !          1482:                                 unsigned int state)
        !          1483: {
        !          1484:   struct tme_sun_sc *sun_sc;
        !          1485:   struct tme_sun_sc_cycle *sun_sc_cycle;
        !          1486:   struct tme_scsi_connection *conn_scsi;
        !          1487:   struct tme_scsi_connection *conn_scsi_other;
        !          1488: 
        !          1489:   /* recover our data structures: */
        !          1490:   sun_sc = conn->tme_connection_element->tme_element_private;
        !          1491:   conn_scsi = (struct tme_scsi_connection *) conn;
        !          1492:   conn_scsi_other = (struct tme_scsi_connection *) conn->tme_connection_other;
        !          1493: 
        !          1494:   /* both sides must be SCSI connections: */
        !          1495:   assert(conn->tme_connection_type == TME_CONNECTION_SCSI);
        !          1496:   assert(conn->tme_connection_other->tme_connection_type == TME_CONNECTION_SCSI);
        !          1497: 
        !          1498:   /* we're always set up to answer calls across the connection, so we
        !          1499:      only have to do work when the connection has gone full, namely
        !          1500:      taking the other side of the connection: */
        !          1501:   if (state == TME_CONNECTION_FULL) {
        !          1502: 
        !          1503:     /* lock our mutex: */
        !          1504:     tme_mutex_lock(&sun_sc->tme_sun_sc_mutex);
        !          1505: 
        !          1506:     /* save our connection: */
        !          1507:     sun_sc->tme_sun_sc_scsi_connection = conn_scsi_other;
        !          1508: 
        !          1509:     /* get the sequences that we need: */
        !          1510:     sun_sc->tme_sun_sc_sequence_info_dma_initiator
        !          1511:       = ((*conn_scsi_other->tme_scsi_connection_sequence_get)
        !          1512:         (conn_scsi_other,
        !          1513:          TME_SCSI_SEQUENCE_INFO_DMA_INITIATOR));
        !          1514:     sun_sc->tme_sun_sc_sequence_wait_change
        !          1515:       = ((*conn_scsi_other->tme_scsi_connection_sequence_get)
        !          1516:         (conn_scsi_other,
        !          1517:          TME_SCSI_SEQUENCE_WAIT_CHANGE));
        !          1518: 
        !          1519:     /* call out a cycle that asserts no signals and runs the
        !          1520:        wait-change sequence.  this also fully-initializes
        !          1521:        this cycle - _tme_sun_sc_cycle_new copies the previous
        !          1522:        cycle into a newly allocated cycle, so this hopefully
        !          1523:        starts the chain of well-initialized cycles: */       
        !          1524:     sun_sc_cycle
        !          1525:       = _tme_sun_sc_cycle_new(sun_sc,
        !          1526:                              sun_sc->tme_sun_sc_sequence_wait_change);
        !          1527:     sun_sc_cycle->tme_sun_sc_cycle_control
        !          1528:       = 0;
        !          1529:     sun_sc_cycle->tme_sun_sc_cycle_data
        !          1530:       = 0;
        !          1531:     _tme_sun_sc_callout(sun_sc, TME_SUN_SC_CALLOUT_CYCLE);
        !          1532: 
        !          1533:     /* unlock our mutex: */
        !          1534:     tme_mutex_unlock(&sun_sc->tme_sun_sc_mutex);
        !          1535:   }
        !          1536: 
        !          1537:   return (TME_OK);
        !          1538: }
        !          1539: 
        !          1540: /* this breaks a connection: */
        !          1541: static int
        !          1542: _tme_sun_sc_connection_break(struct tme_connection *conn, unsigned int state)
        !          1543: {
        !          1544:   abort();
        !          1545: }
        !          1546: 
        !          1547: /* this makes a new connection side for a Sun sc: */
        !          1548: static int
        !          1549: _tme_sun_sc_connections_new(struct tme_element *element,
        !          1550:                            const char * const *args,
        !          1551:                            struct tme_connection **_conns,
        !          1552:                            char **_output)
        !          1553: {
        !          1554:   struct tme_sun_sc *sun_sc;
        !          1555:   struct tme_scsi_connection *conn_scsi;
        !          1556:   struct tme_connection *conn;
        !          1557:   int rc;
        !          1558: 
        !          1559:   /* recover our data structure: */
        !          1560:   sun_sc = (struct tme_sun_sc *) element->tme_element_private;
        !          1561: 
        !          1562:   /* make the generic bus device connection side: */
        !          1563:   rc = tme_bus_device_connections_new(element, args, _conns, _output);
        !          1564:   if (rc != TME_OK) {
        !          1565:     return (rc);
        !          1566:   }
        !          1567: 
        !          1568:   /* since we need to allocate a TLB set when we make our bus
        !          1569:      connection, make sure any generic bus device connection sides
        !          1570:      use our connection maker: */
        !          1571:   for (conn = *_conns;
        !          1572:        conn != NULL;
        !          1573:        conn = conn->tme_connection_next) {
        !          1574:     if ((conn->tme_connection_type
        !          1575:         == TME_CONNECTION_BUS_GENERIC)
        !          1576:        && (conn->tme_connection_make
        !          1577:            == tme_bus_device_connection_make)) {
        !          1578:       conn->tme_connection_make
        !          1579:        = _tme_sun_sc_connection_make_bus;
        !          1580:     }
        !          1581:   }
        !          1582: 
        !          1583:   /* if we don't have a SCSI connection, make one: */
        !          1584:   if (sun_sc->tme_sun_sc_scsi_connection == NULL) {
        !          1585: 
        !          1586:     /* allocate the new SCSI connection: */
        !          1587:     conn_scsi = tme_new0(struct tme_scsi_connection, 1);
        !          1588:     conn = &conn_scsi->tme_scsi_connection;
        !          1589:     
        !          1590:     /* fill in the generic connection: */
        !          1591:     conn->tme_connection_next = *_conns;
        !          1592:     conn->tme_connection_type = TME_CONNECTION_SCSI;
        !          1593:     conn->tme_connection_score = tme_scsi_connection_score;
        !          1594:     conn->tme_connection_make = _tme_sun_sc_connection_make_scsi;
        !          1595:     conn->tme_connection_break = _tme_sun_sc_connection_break;
        !          1596: 
        !          1597:     /* fill in the SCSI connection: */
        !          1598:     conn_scsi->tme_scsi_connection_cycle = _tme_sun_sc_scsi_cycle;
        !          1599:     conn_scsi->tme_scsi_connection_sequence_get = NULL;
        !          1600: 
        !          1601:     /* return the connection side possibility: */
        !          1602:     *_conns = conn;
        !          1603:   }
        !          1604: 
        !          1605:   /* done: */
        !          1606:   return (TME_OK);
        !          1607: }
        !          1608: 
        !          1609: /* the new Sun sc function: */
        !          1610: TME_ELEMENT_SUB_NEW_DECL(tme_bus_multibus,sun_sc) {
        !          1611:   struct tme_sun_sc *sun_sc;
        !          1612:   int arg_i;
        !          1613:   int usage;
        !          1614: 
        !          1615:   /* check our arguments: */
        !          1616:   usage = 0;
        !          1617:   arg_i = 1;
        !          1618:   for (;;) {
        !          1619: 
        !          1620:     if (0) {
        !          1621:     }
        !          1622: 
        !          1623:     /* if we ran out of arguments: */
        !          1624:     else if (args[arg_i] == NULL) {
        !          1625: 
        !          1626:       break;
        !          1627:     }
        !          1628: 
        !          1629:     /* otherwise this is a bad argument: */
        !          1630:     else {
        !          1631:       tme_output_append_error(_output,
        !          1632:                              "%s %s, ",
        !          1633:                              args[arg_i],
        !          1634:                              _("unexpected"));
        !          1635:       usage = TRUE;
        !          1636:       break;
        !          1637:     }
        !          1638:   }
        !          1639: 
        !          1640:   if (usage) {
        !          1641:     tme_output_append_error(_output, 
        !          1642:                            "%s %s",
        !          1643:                            _("usage:"),
        !          1644:                            args[0]);
        !          1645:     return (EINVAL);
        !          1646:   }
        !          1647: 
        !          1648:   /* start the Sun sc structure: */
        !          1649:   sun_sc = tme_new0(struct tme_sun_sc, 1);
        !          1650:   sun_sc->tme_sun_sc_element = element;
        !          1651:   tme_mutex_init(&sun_sc->tme_sun_sc_mutex);
        !          1652:   tme_rwlock_init(&sun_sc->tme_sun_sc_rwlock);
        !          1653: 
        !          1654:   /* initialize our simple bus device descriptor: */
        !          1655:   sun_sc->tme_sun_sc_device.tme_bus_device_element = element;
        !          1656:   sun_sc->tme_sun_sc_device.tme_bus_device_tlb_fill = _tme_sun_sc_tlb_fill;
        !          1657:   sun_sc->tme_sun_sc_device.tme_bus_device_address_last = TME_SUN_SC_SIZ_CARD - 1;
        !          1658: 
        !          1659:   /* fill the element: */
        !          1660:   element->tme_element_private = sun_sc;
        !          1661:   element->tme_element_connections_new = _tme_sun_sc_connections_new;
        !          1662: 
        !          1663:   return (TME_OK);
        !          1664: }

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