/*
* vpoio_wait()
*
* H_SELIN must be low.
*
* XXX should be ported to microseq
*/
static char
vpoio_wait(struct vpoio_data *vpo, int tmo)
{
DECLARE_WAIT_MICROSEQUENCE;
device_t ppbus = device_get_parent(vpo->vpo_dev);
int ret, err;
#if 0 /* broken */
if (ppb_poll_device(ppbus, 150, nBUSY, nBUSY, PPB_INTR))
return (0);
return (ppb_rstr(ppbus) & 0xf0);
#endif
/*
* Return some status information.
* Semantics : 0xc0 = ZIP wants more data
* 0xd0 = ZIP wants to send more data
* 0xe0 = ZIP wants command
* 0xf0 = 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);
}
/*
* ppb_MS_loop()
*
* Execute a microseq loop
*
*/
int
ppb_MS_loop(device_t bus, device_t dev, struct ppb_microseq *prolog,
struct ppb_microseq *body, struct ppb_microseq *epilog,
int iter, int *ret)
{
struct ppb_microseq loop_microseq[] = {
MS_CALL(0), /* execute prolog */
MS_SET(MS_UNKNOWN), /* set size of transfer */
/* loop: */
MS_CALL(0), /* execute body */
MS_DBRA(-1 /* loop: */),
MS_CALL(0), /* execute epilog */
MS_RET(0)
};
/* initialize the structure */
loop_microseq[0].arg[0].p = (void *)prolog;
loop_microseq[1].arg[0].i = iter;
loop_microseq[2].arg[0].p = (void *)body;
loop_microseq[4].arg[0].p = (void *)epilog;
/* execute the loop */
return (ppb_MS_microseq(bus, dev, loop_microseq, ret));
}
static int
vpoio_disconnect(struct vpoio_data *vpo)
{
device_t ppbus = device_get_parent(vpo->vpo_dev);
int ret;
ppb_MS_microseq(ppbus, vpo->vpo_dev, disconnect_microseq, &ret);
return (ppb_release_bus(ppbus, vpo->vpo_dev));
}
/*
* vpoio_in_disk_mode()
*/
static int
vpoio_in_disk_mode(struct vpoio_data *vpo)
{
device_t ppbus = device_get_parent(vpo->vpo_dev);
int ret;
ppb_MS_microseq(ppbus, vpo->vpo_dev, in_disk_mode, &ret);
return (ret);
}
/*
* how : PPB_WAIT or PPB_DONTWAIT
*/
static int
vpoio_connect(struct vpoio_data *vpo, int how)
{
device_t ppbus = device_get_parent(vpo->vpo_dev);
int error;
int ret;
if ((error = ppb_request_bus(ppbus, vpo->vpo_dev, how))) {
#ifdef VP0_DEBUG
printf("%s: can't request bus!\n", __func__);
#endif
return (error);
}
if (PPB_IN_EPP_MODE(ppbus))
ppb_MS_microseq(ppbus, vpo->vpo_dev, connect_epp_microseq, &ret);
else
ppb_MS_microseq(ppbus, vpo->vpo_dev, connect_spp_microseq, &ret);
return (0);
}
/*
* ppb_MS_exec()
*
* Execute any microsequence opcode - expensive
*
*/
int
ppb_MS_exec(device_t bus, device_t dev, int opcode, union ppb_insarg param1,
union ppb_insarg param2, union ppb_insarg param3, int *ret)
{
struct ppb_microseq msq[] = {
{ MS_UNKNOWN, { { MS_UNKNOWN }, { MS_UNKNOWN }, { MS_UNKNOWN } } },
MS_RET(0)
};
/* initialize the corresponding microseq */
msq[0].opcode = opcode;
msq[0].arg[0] = param1;
msq[0].arg[1] = param2;
msq[0].arg[2] = param3;
/* execute the microseq */
return (ppb_MS_microseq(bus, dev, msq, ret));
}
static char
vpoio_select(struct vpoio_data *vpo, int initiator, int target)
{
device_t ppbus = device_get_parent(vpo->vpo_dev);
int ret;
struct ppb_microseq select_microseq[] = {
/* parameter list
*/
#define SELECT_TARGET MS_PARAM(0, 1, MS_TYP_INT)
#define SELECT_INITIATOR MS_PARAM(3, 1, MS_TYP_INT)
/* send the select command to the drive */
MS_DASS(MS_UNKNOWN),
MS_CASS(H_nAUTO | H_nSELIN | H_INIT | H_STROBE),
MS_CASS( H_AUTO | H_nSELIN | H_INIT | H_STROBE),
MS_DASS(MS_UNKNOWN),
MS_CASS( H_AUTO | H_nSELIN | H_nINIT | H_STROBE),
/* now, wait until the drive is ready */
MS_SET(VP0_SELTMO),
/* loop: */ MS_BRSET(H_ACK, 2 /* ready */),
MS_DBRA(-2 /* loop */),
/* error: */ MS_RET(1),
/* ready: */ MS_RET(0)
};
/* initialize the select microsequence */
ppb_MS_init_msq(select_microseq, 2,
SELECT_TARGET, 1 << target,
SELECT_INITIATOR, 1 << initiator);
ppb_MS_microseq(ppbus, vpo->vpo_dev, select_microseq, &ret);
if (ret)
return (VP0_ESELECT_TIMEOUT);
return (0);
}
/*
* vpoio_reset()
*
* SCSI reset signal, the drive must be in disk mode
*/
static void
vpoio_reset(struct vpoio_data *vpo)
{
device_t ppbus = device_get_parent(vpo->vpo_dev);
int ret;
struct ppb_microseq reset_microseq[] = {
#define INITIATOR MS_PARAM(0, 1, MS_TYP_INT)
MS_DASS(MS_UNKNOWN),
MS_CASS(H_AUTO | H_nSELIN | H_nINIT | H_STROBE),
MS_DELAY(25),
MS_CASS(H_AUTO | H_nSELIN | H_INIT | H_STROBE),
MS_RET(0)
};
ppb_MS_init_msq(reset_microseq, 1, INITIATOR, 1 << VP0_INITIATOR);
ppb_MS_microseq(ppbus, vpo->vpo_dev, reset_microseq, &ret);
return;
}
/*
* vpoio_detect()
*
* Detect and initialise the VP0 adapter.
*/
static int
vpoio_detect(struct vpoio_data *vpo)
{
device_t ppbus = device_get_parent(vpo->vpo_dev);
int error, ret;
/* allocate the bus, then apply microsequences */
if ((error = ppb_request_bus(ppbus, vpo->vpo_dev, PPB_DONTWAIT)))
return (error);
/* Force disconnection */
ppb_MS_microseq(ppbus, vpo->vpo_dev, disconnect_microseq, &ret);
/* Try to enter EPP mode, then connect to the drive in EPP mode */
if (ppb_set_mode(ppbus, PPB_EPP) != -1) {
/* call manually the microseq instead of using the appropriate function
* since we already requested the ppbus */
ppb_MS_microseq(ppbus, vpo->vpo_dev, connect_epp_microseq, &ret);
}
/* If EPP mode switch failed or ZIP connection in EPP mode failed,
* try to connect in NIBBLE mode */
if (!vpoio_in_disk_mode(vpo)) {
/* The interface must be at least PS/2 or NIBBLE capable.
* There is no way to know if the ZIP will work with
* PS/2 mode since PS/2 and SPP both use the same connect
* sequence. One must supress PS/2 with boot flags if
* PS/2 mode fails (see ppc(4)).
*/
if (ppb_set_mode(ppbus, PPB_PS2) != -1) {
vpo->vpo_mode_found = VP0_MODE_PS2;
} else {
if (ppb_set_mode(ppbus, PPB_NIBBLE) == -1)
goto error;
vpo->vpo_mode_found = VP0_MODE_NIBBLE;
}
/* Can't know if the interface is capable of PS/2 yet */
ppb_MS_microseq(ppbus, vpo->vpo_dev, connect_spp_microseq, &ret);
if (!vpoio_in_disk_mode(vpo)) {
vpo->vpo_mode_found = VP0_MODE_UNDEFINED;
if (bootverbose)
device_printf(vpo->vpo_dev,
"can't connect to the drive\n");
/* disconnect and release the bus */
ppb_MS_microseq(ppbus, vpo->vpo_dev, disconnect_microseq,
&ret);
goto error;
}
} else {
vpo->vpo_mode_found = VP0_MODE_EPP;
}
/* send SCSI reset signal */
vpoio_reset(vpo);
ppb_MS_microseq(ppbus, vpo->vpo_dev, disconnect_microseq, &ret);
/* ensure we are disconnected or daisy chained peripheral
* may cause serious problem to the disk */
if (vpoio_in_disk_mode(vpo)) {
if (bootverbose)
device_printf(vpo->vpo_dev,
"can't disconnect from the drive\n");
goto error;
}
ppb_release_bus(ppbus, vpo->vpo_dev);
return (0);
error:
ppb_release_bus(ppbus, vpo->vpo_dev);
return (VP0_EINITFAILED);
}
/*
* ppb_MS_microseq()
*
* Interprete a microsequence. Some microinstructions are executed at adapter
* level to avoid function call overhead between ppbus and the adapter
*/
int
ppb_MS_microseq(device_t bus, device_t dev, struct ppb_microseq *msq, int *ret)
{
struct ppb_data *ppb = (struct ppb_data *)device_get_softc(bus);
struct ppb_device *ppbdev = (struct ppb_device *)device_get_ivars(dev);
struct ppb_microseq *mi; /* current microinstruction */
int error;
struct ppb_xfer *xfer;
/* microsequence executed to initialize the transfer */
struct ppb_microseq initxfer[] = {
MS_PTR(MS_UNKNOWN), /* set ptr to buffer */
MS_SET(MS_UNKNOWN), /* set transfer size */
MS_RET(0)
};
if (ppb->ppb_owner != dev)
return (EACCES);
#define INCR_PC (mi ++)
mi = msq;
for (;;) {
switch (mi->opcode) {
case MS_OP_PUT:
case MS_OP_GET:
/* attempt to choose the best mode for the device */
xfer = mode2xfer(bus, ppbdev, mi->opcode);
/* figure out if we should use ieee1284 code */
if (!xfer->loop) {
if (mi->opcode == MS_OP_PUT) {
if ((error = PPBUS_WRITE(
device_get_parent(bus),
(char *)mi->arg[0].p,
mi->arg[1].i, 0)))
goto error;
INCR_PC;
goto next;
} else
panic("%s: IEEE1284 read not supported", __func__);
}
/* XXX should use ppb_MS_init_msq() */
initxfer[0].arg[0].p = mi->arg[0].p;
initxfer[1].arg[0].i = mi->arg[1].i;
/* initialize transfer */
ppb_MS_microseq(bus, dev, initxfer, &error);
if (error)
goto error;
/* the xfer microsequence should not contain any
* MS_OP_PUT or MS_OP_GET!
*/
ppb_MS_microseq(bus, dev, xfer->loop, &error);
if (error)
goto error;
INCR_PC;
break;
case MS_OP_RET:
if (ret)
*ret = mi->arg[0].i; /* return code */
return (0);
break;
default:
/* executing microinstructions at ppc level is
* faster. This is the default if the microinstr
* is unknown here
*/
if ((error = PPBUS_EXEC_MICROSEQ(
device_get_parent(bus), &mi)))
goto error;
break;
}
next:
continue;
}
error:
return (error);
}
