d/freebsd-dev
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
6e50170633
freebsd-dev/sys/dev/ppbus/immio.c
John Baldwin 2067d312d4 Add locking to ppc and ppbus and mark the whole lot MPSAFE: 
- To avoid having a bunch of locks that end up always getting acquired as
  a group, give each ppc(4) device a mutex which it shares with all the
  child devices including ppbus(4), lpt(4), plip(4), etc.  This mutex
  is then used for all the locking.
- Rework the interrupt handling stuff yet again.  Now ppbus drivers setup
  their interrupt handler during attach and tear it down during detach
  like most other drivers.  ppbus(4) only invokes the interrupt handler
  of the device that currently owns the bus (if any) when an interrupt
  occurs, however.  Also, interrupt handlers in general now accept their
  softc pointers as their argument rather than the device_t.  Another
  feature of the ppbus interrupt handlers is that they are called with
  the parent ppc device's lock already held.  This minimizes the number
  of lock operations during an interrupt.
- Mark plip(4), lpt(4), pcfclock(4), ppi(4), vpo(4) MPSAFE.
- lpbb(4) uses the ppc lock instead of Giant.
- Other plip(4) changes:
  - Add a mutex to protect the global tables in plip(4) and free them on
    module unload.
  - Add a detach routine.
  - Split out the init/stop code from the ioctl routine into separate
    functions.
- Other lpt(4) changes:
  - Use device_printf().
  - Use a dedicated callout for the lptout timer.
  - Allocate the I/O buffers at attach and detach rather than during
    open and close as this simplifies the locking at the cost of
    1024+32 bytes when the driver is attached.
- Other ppi(4) changes:
  - Use an sx lock to serialize open and close.
  - Remove unused HADBUS flag.
  - Add a detach routine.
  - Use a malloc'd buffer for each read and write to avoid races with
    concurrent read/write.
- Other pps(4) changes:
  - Use a callout rather than a callout handle with timeout().
  - Conform to the new ppbus requirements (regular mutex, non-filter
    interrupt handler).  pps(4) is probably going to have to become a
    standalone driver that doesn't use ppbus(4) to satisfy it's
    requirements for low latency as a result.
  - Use an sx lock to serialize open and close.
- Other vpo(4) changes:
  - Use the parent ppc device's lock to create the CAM sim instead of
    Giant.
- Other ppc(4) changes:
  - Fix ppc_isa's detach method to detach instead of calling attach.

Tested by:	  no one :-(
2009-01-21 23:10:06 +00:00

817 lines
19 KiB
C
Raw Blame History

/*-
* 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.
*
*
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* 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 <sys/param.h>
#include <sys/systm.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/malloc.h>
#endif /* _KERNEL */
#include "opt_vpo.h"
#include <dev/ppbus/ppbio.h>
#include <dev/ppbus/ppbconf.h>
#include <dev/ppbus/ppb_msq.h>
#include <dev/ppbus/vpoio.h>
#include <dev/ppbus/ppb_1284.h>
#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 NEGOCIATED_MODE MS_PARAM(2, 1, MS_TYP_CHA)
#define DECLARE_NEGOCIATE_MICROSEQ \
struct ppb_microseq negociate_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_ENEGOCIATE), \
/* 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)
device_printf(vpo->vpo_dev,
"(disconnect) s1=0x%x s2=0x%x, s3=0x%x\n",
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)
device_printf(vpo->vpo_dev,
"(connect) s1=0x%x s2=0x%x, s3=0x%x\n",
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 {
device_printf(vpo->vpo_dev,
"NIBBLE mode unavailable!\n");
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)
device_printf(vpo->vpo_dev,
"can't disconnect from the drive\n");
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)
{
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, (union ppb_insarg)buffer,
(union ppb_insarg)size, (union ppb_insarg)MS_UNKNOWN, &error);
return (error);
}
/*
* imm_instr()
*/
static int
imm_instr(struct vpoio_data *vpo, char *buffer, int size)
{
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, (union ppb_insarg)buffer,
(union ppb_insarg)size, (union ppb_insarg)MS_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_negociate(struct vpoio_data *vpo)
{
DECLARE_NEGOCIATE_MICROSEQ;
device_t ppbus = device_get_parent(vpo->vpo_dev);
int negociate_mode;
int ret;
if (PPB_IN_NIBBLE_MODE(ppbus))
negociate_mode = 0;
else if (PPB_IN_PS2_MODE(ppbus))
negociate_mode = 1;
else
return (0);
#if 0 /* XXX use standalone code not to depend on ppb_1284 code yet */
ret = ppb_1284_negociate(ppbus, negociate_mode);
if (ret)
return (VP0_ENEGOCIATE);
#endif
ppb_MS_init_msq(negociate_microseq, 1,
NEGOCIATED_MODE, negociate_mode);
ppb_MS_microseq(ppbus, vpo->vpo_dev, negociate_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 = (struct ppb_microseq *)malloc(
sizeof(nibble_inbyte_submicroseq), M_DEVBUF, M_NOWAIT);
if (!vpo->vpo_nibble_inbyte_msq)
return (ENXIO);
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
*/
ppb_lock(ppbus);
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);
device_printf(vpo->vpo_dev, "EPP mode\n");
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);
device_printf(vpo->vpo_dev, "PS2 mode\n");
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);
device_printf(vpo->vpo_dev, "NIBBLE mode\n");
break;
default:
panic("imm: unknown mode %d", vpo->vpo_mode_found);
}
ppb_release_bus(ppbus, vpo->vpo_dev);
error:
ppb_unlock(ppbus);
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);
register char r;
char l, h = 0;
int len, error = 0, not_connected = 0;
register int k;
int negociated = 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, &not_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_negociate(vpo)) {
*ret = VP0_ENEGOCIATE;
goto error;
} else
negociated = 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)) && negociated)
ppb_MS_microseq(ppbus, vpo->vpo_dev, transfer_epilog, NULL);
/*
* Retrieve status ...
*/
if (imm_negociate(vpo)) {
*ret = VP0_ENEGOCIATE;
goto error;
} else
negociated = 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 == (char) -1)
h = 0;
*result = ((int) h << 8) | ((int) l & 0xff);
error:
if ((PPB_IN_NIBBLE_MODE(ppbus) ||
PPB_IN_PS2_MODE(ppbus)) && negociated)
ppb_MS_microseq(ppbus, vpo->vpo_dev, transfer_epilog, NULL);
/* return to printer state, release the ppbus */
imm_disconnect(vpo, NULL, 1);
return (0);
}
Reference in New Issue View Git Blame Copy Permalink