/*- * Copyright (c) 1998, 1999 Nicolas Souchu * Copyright (c) 2001 Alcove - Nicolas Souchu * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $FreeBSD: src/sys/dev/ppbus/immio.c,v 1.10.2.3 2001/10/02 05:27:20 nsouch Exp $ */ /* * Iomega ZIP+ Matchmaker Parallel Port Interface driver * * Thanks to David Campbell work on the Linux driver and the Iomega specs * Thanks to Thiebault Moeglin for the drive */ #ifdef _KERNEL #include #include #include #include #include #endif /* _KERNEL */ #include "opt_vpo.h" #include #include #include #include "vpoio.h" #include #include "ppbus_if.h" #define VP0_SELTMO 5000 /* select timeout */ #define VP0_FAST_SPINTMO 500000 /* wait status timeout */ #define VP0_LOW_SPINTMO 5000000 /* wait status timeout */ #define VP0_SECTOR_SIZE 512 /* * Microcode to execute very fast I/O sequences at the lowest bus level. */ #define WAIT_RET MS_PARAM(7, 2, MS_TYP_PTR) #define WAIT_TMO MS_PARAM(1, 0, MS_TYP_INT) #define DECLARE_WAIT_MICROSEQUENCE \ struct ppb_microseq wait_microseq[] = { \ MS_CASS(0x0c), \ MS_SET(MS_UNKNOWN), \ /* loop */ \ MS_BRSET(nBUSY, 4 /* ready */), \ MS_DBRA(-2 /* loop */), \ MS_CASS(0x04), \ MS_RET(1), /* timed out */ \ /* ready */ \ MS_CASS(0x04), \ MS_RFETCH(MS_REG_STR, 0xb8, MS_UNKNOWN ), \ MS_RET(0) /* no error */ \ } #define SELECT_TARGET MS_PARAM(6, 1, MS_TYP_CHA) #define DECLARE_SELECT_MICROSEQUENCE \ struct ppb_microseq select_microseq[] = { \ MS_CASS(0xc), \ /* first, check there is nothing holding onto the bus */ \ MS_SET(VP0_SELTMO), \ /* _loop: */ \ MS_BRCLEAR(0x8, 2 /* _ready */), \ MS_DBRA(-2 /* _loop */), \ MS_RET(2), /* bus busy */ \ /* _ready: */ \ MS_CASS(0x4), \ MS_DASS(MS_UNKNOWN /* 0x80 | 1 << target */), \ MS_DELAY(1), \ MS_CASS(0xc), \ MS_CASS(0xd), \ /* now, wait until the drive is ready */ \ MS_SET(VP0_SELTMO), \ /* loop: */ \ MS_BRSET(0x8, 3 /* ready */), \ MS_DBRA(-2 /* loop */), \ /* error: */ \ MS_CASS(0xc), \ MS_RET(VP0_ESELECT_TIMEOUT), \ /* ready: */ \ MS_CASS(0xc), \ MS_RET(0) \ } static struct ppb_microseq transfer_epilog[] = { MS_CASS(0x4), MS_CASS(0xc), MS_CASS(0xe), MS_CASS(0x4), MS_RET(0) }; #define CPP_S1 MS_PARAM(10, 2, MS_TYP_PTR) #define CPP_S2 MS_PARAM(13, 2, MS_TYP_PTR) #define CPP_S3 MS_PARAM(16, 2, MS_TYP_PTR) #define CPP_PARAM MS_PARAM(17, 1, MS_TYP_CHA) #define DECLARE_CPP_MICROSEQ \ struct ppb_microseq cpp_microseq[] = { \ MS_CASS(0x0c), MS_DELAY(2), \ MS_DASS(0xaa), MS_DELAY(10), \ MS_DASS(0x55), MS_DELAY(10), \ MS_DASS(0x00), MS_DELAY(10), \ MS_DASS(0xff), MS_DELAY(10), \ MS_RFETCH(MS_REG_STR, 0xb8, MS_UNKNOWN /* &s1 */), \ MS_DASS(0x87), MS_DELAY(10), \ MS_RFETCH(MS_REG_STR, 0xb8, MS_UNKNOWN /* &s2 */), \ MS_DASS(0x78), MS_DELAY(10), \ MS_RFETCH(MS_REG_STR, 0x38, MS_UNKNOWN /* &s3 */), \ MS_DASS(MS_UNKNOWN /* param */), \ MS_DELAY(2), \ MS_CASS(0x0c), MS_DELAY(10), \ MS_CASS(0x0d), MS_DELAY(2), \ MS_CASS(0x0c), MS_DELAY(10), \ MS_DASS(0xff), MS_DELAY(10), \ MS_RET(0) \ } #define NEGOTIATED_MODE MS_PARAM(2, 1, MS_TYP_CHA) #define DECLARE_NEGOTIATE_MICROSEQ \ struct ppb_microseq negotiate_microseq[] = { \ MS_CASS(0x4), \ MS_DELAY(5), \ MS_DASS(MS_UNKNOWN /* mode */), \ MS_DELAY(100), \ MS_CASS(0x6), \ MS_DELAY(5), \ MS_BRSET(0x20, 5 /* continue */), \ MS_DELAY(5), \ MS_CASS(0x7), \ MS_DELAY(5), \ MS_CASS(0x6), \ MS_RET(VP0_ENEGOTIATE), \ /* continue: */ \ MS_DELAY(5), \ MS_CASS(0x7), \ MS_DELAY(5), \ MS_CASS(0x6), \ MS_RET(0) \ } #define INB_NIBBLE_L MS_PARAM(3, 2, MS_TYP_PTR) #define INB_NIBBLE_H MS_PARAM(6, 2, MS_TYP_PTR) #define INB_NIBBLE_F MS_PARAM(9, 0, MS_TYP_FUN) #define INB_NIBBLE_P MS_PARAM(9, 1, MS_TYP_PTR) /* * This is the sub-microseqence for MS_GET in NIBBLE mode * Retrieve the two nibbles and call the C function to generate the character * and store it in the buffer (see nibble_inbyte_hook()) */ #define DECLARE_NIBBLE_INBYTE_SUBMICROSEQ \ struct ppb_microseq nibble_inbyte_submicroseq[] = { \ MS_CASS(0x4), \ /* loop: */ \ MS_CASS(0x6), \ MS_DELAY(1), \ MS_RFETCH(MS_REG_STR, MS_FETCH_ALL, MS_UNKNOWN /* low nibble */),\ MS_CASS(0x5), \ MS_DELAY(1), \ MS_RFETCH(MS_REG_STR, MS_FETCH_ALL, MS_UNKNOWN /* high nibble */),\ MS_CASS(0x4), \ MS_DELAY(1), \ /* do a C call to format the received nibbles */ \ MS_C_CALL(MS_UNKNOWN /* C hook */, MS_UNKNOWN /* param */), \ MS_DBRA(-7 /* loop */), \ MS_RET(0) \ } static struct ppb_microseq reset_microseq[] = { MS_CASS(0x04), MS_DASS(0x40), MS_DELAY(1), MS_CASS(0x0c), MS_CASS(0x0d), MS_DELAY(50), MS_CASS(0x0c), MS_CASS(0x04), MS_RET(0) }; /* * nibble_inbyte_hook() * * Formats high and low nibble into a character */ static int nibble_inbyte_hook (void *p, char *ptr) { struct vpo_nibble *s = (struct vpo_nibble *)p; /* increment the buffer pointer */ *ptr = ((s->l >> 4) & 0x0f) + (s->h & 0xf0); return (0); } /* * This is the sub-microseqence for MS_GET in PS2 mode */ static struct ppb_microseq ps2_inbyte_submicroseq[] = { MS_CASS(0x4), /* loop: */ MS_CASS(PCD | 0x6), MS_RFETCH_P(1, MS_REG_DTR, MS_FETCH_ALL), MS_CASS(PCD | 0x5), MS_DBRA(-4 /* loop */), MS_RET(0) }; /* * This is the sub-microsequence for MS_PUT in both NIBBLE and PS2 modes */ static struct ppb_microseq spp_outbyte_submicroseq[] = { MS_CASS(0x4), /* loop: */ MS_RASSERT_P(1, MS_REG_DTR), MS_CASS(0x5), MS_DBRA(0), /* decrement counter */ MS_RASSERT_P(1, MS_REG_DTR), MS_CASS(0x0), MS_DBRA(-6 /* loop */), /* return from the put call */ MS_CASS(0x4), MS_RET(0) }; /* EPP 1.7 microsequences, ptr and len set at runtime */ static struct ppb_microseq epp17_outstr[] = { MS_CASS(0x4), MS_RASSERT_P(MS_ACCUM, MS_REG_EPP_D), MS_CASS(0xc), MS_RET(0), }; static struct ppb_microseq epp17_instr[] = { MS_CASS(PCD | 0x4), MS_RFETCH_P(MS_ACCUM, MS_REG_EPP_D, MS_FETCH_ALL), MS_CASS(PCD | 0xc), MS_RET(0), }; static int imm_disconnect(struct vpoio_data *vpo, int *connected, int release_bus) { DECLARE_CPP_MICROSEQ; device_t ppbus = device_get_parent(vpo->vpo_dev); char s1, s2, s3; int ret; /* all should be ok */ if (connected) *connected = 0; ppb_MS_init_msq(cpp_microseq, 4, CPP_S1, (void *)&s1, CPP_S2, (void *)&s2, CPP_S3, (void *)&s3, CPP_PARAM, 0x30); ppb_MS_microseq(ppbus, vpo->vpo_dev, cpp_microseq, &ret); if ((s1 != (char)0xb8 || s2 != (char)0x18 || s3 != (char)0x38)) { if (bootverbose) kprintf("imm%d: (disconnect) s1=0x%x s2=0x%x, s3=0x%x\n", vpo->vpo_unit, s1 & 0xff, s2 & 0xff, s3 & 0xff); if (connected) *connected = VP0_ECONNECT; } if (release_bus) return (ppb_release_bus(ppbus, vpo->vpo_dev)); else return (0); } /* * how : PPB_WAIT or PPB_DONTWAIT */ static int imm_connect(struct vpoio_data *vpo, int how, int *disconnected, int request_bus) { DECLARE_CPP_MICROSEQ; device_t ppbus = device_get_parent(vpo->vpo_dev); char s1, s2, s3; int error; int ret; /* all should be ok */ if (disconnected) *disconnected = 0; if (request_bus) if ((error = ppb_request_bus(ppbus, vpo->vpo_dev, how))) return (error); ppb_MS_init_msq(cpp_microseq, 3, CPP_S1, (void *)&s1, CPP_S2, (void *)&s2, CPP_S3, (void *)&s3); /* select device 0 in compatible mode */ ppb_MS_init_msq(cpp_microseq, 1, CPP_PARAM, 0xe0); ppb_MS_microseq(ppbus, vpo->vpo_dev, cpp_microseq, &ret); /* disconnect all devices */ ppb_MS_init_msq(cpp_microseq, 1, CPP_PARAM, 0x30); ppb_MS_microseq(ppbus, vpo->vpo_dev, cpp_microseq, &ret); if (PPB_IN_EPP_MODE(ppbus)) ppb_MS_init_msq(cpp_microseq, 1, CPP_PARAM, 0x28); else ppb_MS_init_msq(cpp_microseq, 1, CPP_PARAM, 0xe0); ppb_MS_microseq(ppbus, vpo->vpo_dev, cpp_microseq, &ret); if ((s1 != (char)0xb8 || s2 != (char)0x18 || s3 != (char)0x30)) { if (bootverbose) kprintf("imm%d: (connect) s1=0x%x s2=0x%x, s3=0x%x\n", vpo->vpo_unit, s1 & 0xff, s2 & 0xff, s3 & 0xff); if (disconnected) *disconnected = VP0_ECONNECT; } return (0); } /* * imm_detect() * * Detect and initialise the VP0 adapter. */ static int imm_detect(struct vpoio_data *vpo) { device_t ppbus = device_get_parent(vpo->vpo_dev); int error; if ((error = ppb_request_bus(ppbus, vpo->vpo_dev, PPB_DONTWAIT))) return (error); /* disconnect the drive, keep the bus */ imm_disconnect(vpo, NULL, 0); vpo->vpo_mode_found = VP0_MODE_UNDEFINED; error = 1; /* try to enter EPP mode since vpoio failure put the bus in NIBBLE */ if (ppb_set_mode(ppbus, PPB_EPP) != -1) { imm_connect(vpo, PPB_DONTWAIT, &error, 0); } /* if connection failed try PS/2 then NIBBLE modes */ if (error) { if (ppb_set_mode(ppbus, PPB_PS2) != -1) { imm_connect(vpo, PPB_DONTWAIT, &error, 0); } if (error) { if (ppb_set_mode(ppbus, PPB_NIBBLE) != -1) { imm_connect(vpo, PPB_DONTWAIT, &error, 0); if (error) goto error; vpo->vpo_mode_found = VP0_MODE_NIBBLE; } else { kprintf("imm%d: NIBBLE mode unavailable!\n", vpo->vpo_unit); goto error; } } else { vpo->vpo_mode_found = VP0_MODE_PS2; } } else { vpo->vpo_mode_found = VP0_MODE_EPP; } /* send SCSI reset signal */ ppb_MS_microseq(ppbus, vpo->vpo_dev, reset_microseq, NULL); /* release the bus now */ imm_disconnect(vpo, &error, 1); /* ensure we are disconnected or daisy chained peripheral * may cause serious problem to the disk */ if (error) { if (bootverbose) kprintf("imm%d: can't disconnect from the drive\n", vpo->vpo_unit); goto error; } return (0); error: ppb_release_bus(ppbus, vpo->vpo_dev); return (VP0_EINITFAILED); } /* * imm_outstr() */ static int imm_outstr(struct vpoio_data *vpo, char *_buffer, int _size) { union ppb_insarg buffer = { .c = _buffer }; union ppb_insarg size = { .i = _size }; union ppb_insarg unknown = { .i = MS_UNKNOWN }; device_t ppbus = device_get_parent(vpo->vpo_dev); int error = 0; if (PPB_IN_EPP_MODE(ppbus)) ppb_reset_epp_timeout(ppbus); ppb_MS_exec(ppbus, vpo->vpo_dev, MS_OP_PUT, buffer, size, unknown, &error); return (error); } /* * imm_instr() */ static int imm_instr(struct vpoio_data *vpo, char *_buffer, int _size) { union ppb_insarg buffer = { .c = _buffer }; union ppb_insarg size = { .i = _size }; union ppb_insarg unknown = { .i = MS_UNKNOWN }; device_t ppbus = device_get_parent(vpo->vpo_dev); int error = 0; if (PPB_IN_EPP_MODE(ppbus)) ppb_reset_epp_timeout(ppbus); ppb_MS_exec(ppbus, vpo->vpo_dev, MS_OP_GET, buffer, size, unknown, &error); return (error); } static char imm_select(struct vpoio_data *vpo, int initiator, int target) { DECLARE_SELECT_MICROSEQUENCE; device_t ppbus = device_get_parent(vpo->vpo_dev); int ret; /* initialize the select microsequence */ ppb_MS_init_msq(select_microseq, 1, SELECT_TARGET, 1 << initiator | 1 << target); ppb_MS_microseq(ppbus, vpo->vpo_dev, select_microseq, &ret); return (ret); } /* * imm_wait() * * H_SELIN must be low. * */ static char imm_wait(struct vpoio_data *vpo, int tmo) { DECLARE_WAIT_MICROSEQUENCE; device_t ppbus = device_get_parent(vpo->vpo_dev); int ret, err; /* * Return some status information. * Semantics : 0x88 = ZIP+ wants more data * 0x98 = ZIP+ wants to send more data * 0xa8 = ZIP+ wants command * 0xb8 = end of transfer, ZIP+ is sending status */ ppb_MS_init_msq(wait_microseq, 2, WAIT_RET, (void *)&ret, WAIT_TMO, tmo); ppb_MS_microseq(ppbus, vpo->vpo_dev, wait_microseq, &err); if (err) return (0); /* command timed out */ return(ret); } static int imm_negotiate(struct vpoio_data *vpo) { DECLARE_NEGOTIATE_MICROSEQ; device_t ppbus = device_get_parent(vpo->vpo_dev); int negotiate_mode; int ret; if (PPB_IN_NIBBLE_MODE(ppbus)) negotiate_mode = 0; else if (PPB_IN_PS2_MODE(ppbus)) negotiate_mode = 1; else return (0); #if 0 /* XXX use standalone code not to depend on ppb_1284 code yet */ ret = ppb_1284_negotiate(ppbus, negotiate_mode); if (ret) return (VP0_ENEGOTIATE); #endif ppb_MS_init_msq(negotiate_microseq, 1, NEGOTIATED_MODE, negotiate_mode); ppb_MS_microseq(ppbus, vpo->vpo_dev, negotiate_microseq, &ret); return (ret); } /* * imm_probe() * * Low level probe of vpo device * */ int imm_probe(device_t dev, struct vpoio_data *vpo) { int error; /* ppbus dependent initialisation */ vpo->vpo_dev = dev; /* now, try to initialise the drive */ if ((error = imm_detect(vpo))) { return (error); } return (0); } /* * imm_attach() * * Low level attachment of vpo device * */ int imm_attach(struct vpoio_data *vpo) { DECLARE_NIBBLE_INBYTE_SUBMICROSEQ; device_t ppbus = device_get_parent(vpo->vpo_dev); int error = 0; /* * Initialize microsequence code */ vpo->vpo_nibble_inbyte_msq = kmalloc(sizeof(nibble_inbyte_submicroseq), M_DEVBUF, M_WAITOK); bcopy((void *)nibble_inbyte_submicroseq, (void *)vpo->vpo_nibble_inbyte_msq, sizeof(nibble_inbyte_submicroseq)); ppb_MS_init_msq(vpo->vpo_nibble_inbyte_msq, 4, INB_NIBBLE_H, (void *)&(vpo)->vpo_nibble.h, INB_NIBBLE_L, (void *)&(vpo)->vpo_nibble.l, INB_NIBBLE_F, nibble_inbyte_hook, INB_NIBBLE_P, (void *)&(vpo)->vpo_nibble); /* * Initialize mode dependent in/out microsequences */ if ((error = ppb_request_bus(ppbus, vpo->vpo_dev, PPB_WAIT))) goto error; /* ppbus automatically restore the last mode entered during detection */ switch (vpo->vpo_mode_found) { case VP0_MODE_EPP: ppb_MS_GET_init(ppbus, vpo->vpo_dev, epp17_instr); ppb_MS_PUT_init(ppbus, vpo->vpo_dev, epp17_outstr); kprintf("imm%d: EPP mode\n", vpo->vpo_unit); break; case VP0_MODE_PS2: ppb_MS_GET_init(ppbus, vpo->vpo_dev, ps2_inbyte_submicroseq); ppb_MS_PUT_init(ppbus, vpo->vpo_dev, spp_outbyte_submicroseq); kprintf("imm%d: PS2 mode\n", vpo->vpo_unit); break; case VP0_MODE_NIBBLE: ppb_MS_GET_init(ppbus, vpo->vpo_dev, vpo->vpo_nibble_inbyte_msq); ppb_MS_PUT_init(ppbus, vpo->vpo_dev, spp_outbyte_submicroseq); kprintf("imm%d: NIBBLE mode\n", vpo->vpo_unit); break; default: panic("imm: unknown mode %d", vpo->vpo_mode_found); } ppb_release_bus(ppbus, vpo->vpo_dev); error: return (error); } /* * imm_reset_bus() * */ int imm_reset_bus(struct vpoio_data *vpo) { device_t ppbus = device_get_parent(vpo->vpo_dev); int disconnected; /* first, connect to the drive and request the bus */ imm_connect(vpo, PPB_WAIT|PPB_INTR, &disconnected, 1); if (!disconnected) { /* reset the SCSI bus */ ppb_MS_microseq(ppbus, vpo->vpo_dev, reset_microseq, NULL); /* then disconnect */ imm_disconnect(vpo, NULL, 1); } return (0); } /* * imm_do_scsi() * * Send an SCSI command * */ int imm_do_scsi(struct vpoio_data *vpo, int host, int target, char *command, int clen, char *buffer, int blen, int *result, int *count, int *ret) { device_t ppbus = device_get_parent(vpo->vpo_dev); char r; char l, h = 0; int len, error = 0, not_connected = 0; int k; int negotiated = 0; /* * enter disk state, allocate the ppbus * * XXX * Should we allow this call to be interruptible? * The only way to report the interruption is to return * EIO to upper SCSI code :^( */ if ((error = imm_connect(vpo, PPB_WAIT|PPB_INTR, ¬_connected, 1))) return (error); if (not_connected) { *ret = VP0_ECONNECT; goto error; } /* * Select the drive ... */ if ((*ret = imm_select(vpo,host,target))) goto error; /* * Send the command ... */ for (k = 0; k < clen; k+=2) { if (imm_wait(vpo, VP0_FAST_SPINTMO) != (char)0xa8) { *ret = VP0_ECMD_TIMEOUT; goto error; } if (imm_outstr(vpo, &command[k], 2)) { *ret = VP0_EPPDATA_TIMEOUT; goto error; } } if (!(r = imm_wait(vpo, VP0_LOW_SPINTMO))) { *ret = VP0_ESTATUS_TIMEOUT; goto error; } if ((r & 0x30) == 0x10) { if (imm_negotiate(vpo)) { *ret = VP0_ENEGOTIATE; goto error; } else negotiated = 1; } /* * Complete transfer ... */ *count = 0; for (;;) { if (!(r = imm_wait(vpo, VP0_LOW_SPINTMO))) { *ret = VP0_ESTATUS_TIMEOUT; goto error; } /* stop when the ZIP+ wants to send status */ if (r == (char)0xb8) break; if (*count >= blen) { *ret = VP0_EDATA_OVERFLOW; goto error; } /* ZIP+ wants to send data? */ if (r == (char)0x88) { len = (((blen - *count) >= VP0_SECTOR_SIZE)) ? VP0_SECTOR_SIZE : 2; error = imm_outstr(vpo, &buffer[*count], len); } else { if (!PPB_IN_EPP_MODE(ppbus)) len = 1; else len = (((blen - *count) >= VP0_SECTOR_SIZE)) ? VP0_SECTOR_SIZE : 1; error = imm_instr(vpo, &buffer[*count], len); } if (error) { *ret = error; goto error; } *count += len; } if ((PPB_IN_NIBBLE_MODE(ppbus) || PPB_IN_PS2_MODE(ppbus)) && negotiated) ppb_MS_microseq(ppbus, vpo->vpo_dev, transfer_epilog, NULL); /* * Retrieve status ... */ if (imm_negotiate(vpo)) { *ret = VP0_ENEGOTIATE; goto error; } else negotiated = 1; if (imm_instr(vpo, &l, 1)) { *ret = VP0_EOTHER; goto error; } /* check if the ZIP+ wants to send more status */ if (imm_wait(vpo, VP0_FAST_SPINTMO) == (char)0xb8) if (imm_instr(vpo, &h, 1)) { *ret = VP0_EOTHER+2; goto error; } /* Experience showed that we should discard this */ if (h == -1) h = 0; *result = ((int) h << 8) | ((int) l & 0xff); error: if ((PPB_IN_NIBBLE_MODE(ppbus) || PPB_IN_PS2_MODE(ppbus)) && negotiated) ppb_MS_microseq(ppbus, vpo->vpo_dev, transfer_epilog, NULL); /* return to printer state, release the ppbus */ imm_disconnect(vpo, NULL, 1); return (0); }