/**
* hub_set_piomode - set pio mode for a given hub
*
* @nasid: physical node ID for the hub in question
*
* Put the hub into either "PIO conveyor belt" mode or "fire-and-forget" mode.
* To do this, we have to make absolutely sure that no PIOs are in progress
* so we turn off access to all widgets for the duration of the function.
*
* XXX - This code should really check what kind of widget we're talking
* to. Bridges can only handle three requests, but XG will do more.
* How many can crossbow handle to widget 0? We're assuming 1.
*
* XXX - There is a bug in the crossbow that link reset PIOs do not
* return write responses. The easiest solution to this problem is to
* leave widget 0 (xbow) in fire-and-forget mode at all times. This
* only affects pio's to xbow registers, which should be rare.
**/
static void hub_set_piomode(nasid_t nasid)
{
hubreg_t ii_iowa;
hubii_wcr_t ii_wcr;
unsigned i;
ii_iowa = REMOTE_HUB_L(nasid, IIO_OUTWIDGET_ACCESS);
REMOTE_HUB_S(nasid, IIO_OUTWIDGET_ACCESS, 0);
ii_wcr.wcr_reg_value = REMOTE_HUB_L(nasid, IIO_WCR);
if (ii_wcr.iwcr_dir_con) {
/*
* Assume a bridge here.
*/
hub_setup_prb(nasid, 0, 3);
} else {
/*
* Assume a crossbow here.
*/
hub_setup_prb(nasid, 0, 1);
}
/*
* XXX - Here's where we should take the widget type into
* when account assigning credits.
*/
for (i = HUB_WIDGET_ID_MIN; i <= HUB_WIDGET_ID_MAX; i++)
hub_setup_prb(nasid, i, 3);
REMOTE_HUB_S(nasid, IIO_OUTWIDGET_ACCESS, ii_iowa);
}
/*
* hub_set_piomode()
*
* Put the hub into either "PIO conveyor belt" mode or "fire-and-forget"
* mode. To do this, we have to make absolutely sure that no PIOs
* are in progress so we turn off access to all widgets for the duration
* of the function.
*
* XXX - This code should really check what kind of widget we're talking
* to. Bridges can only handle three requests, but XG will do more.
* How many can crossbow handle to widget 0? We're assuming 1.
*
* XXX - There is a bug in the crossbow that link reset PIOs do not
* return write responses. The easiest solution to this problem is to
* leave widget 0 (xbow) in fire-and-forget mode at all times. This
* only affects pio's to xbow registers, which should be rare.
*/
void
hub_set_piomode(nasid_t nasid, int conveyor)
{
hubreg_t ii_iowa;
int direct_connect;
hubii_wcr_t ii_wcr;
int prbnum;
int s, cons_lock = 0;
ASSERT(NASID_TO_COMPACT_NODEID(nasid) != INVALID_CNODEID);
if (nasid == get_console_nasid()) {
PUTBUF_LOCK(s);
cons_lock = 1;
}
ii_iowa = REMOTE_HUB_L(nasid, IIO_OUTWIDGET_ACCESS);
REMOTE_HUB_S(nasid, IIO_OUTWIDGET_ACCESS, 0);
ii_wcr.wcr_reg_value = REMOTE_HUB_L(nasid, IIO_WCR);
direct_connect = ii_wcr.iwcr_dir_con;
if (direct_connect) {
/*
* Assume a bridge here.
*/
hub_setup_prb(nasid, 0, 3, conveyor);
} else {
/*
* Assume a crossbow here.
*/
hub_setup_prb(nasid, 0, 1, conveyor);
}
for (prbnum = HUB_WIDGET_ID_MIN; prbnum <= HUB_WIDGET_ID_MAX; prbnum++) {
/*
* XXX - Here's where we should take the widget type into
* when account assigning credits.
*/
/* Always set the PRBs in fire-and-forget mode */
hub_setup_prb(nasid, prbnum, 3, conveyor);
}
#ifdef IRIX
/*
* In direct connect mode, disable access to all widgets but 0.
* Later, the prom will do this for us.
*/
if (direct_connect)
ii_iowa = 1;
#endif
REMOTE_HUB_S(nasid, IIO_OUTWIDGET_ACCESS, ii_iowa);
if (cons_lock)
PUTBUF_UNLOCK(s);
}
/* Interface to allow special drivers to set hub specific
* device flags.
* Return 0 on failure , 1 on success
*/
int
hub_widget_flags_set(nasid_t nasid,
xwidgetnum_t widget_num,
hub_widget_flags_t flags)
{
ASSERT((flags & HUB_WIDGET_FLAGS) == flags);
if (flags & HUB_PIO_CONVEYOR) {
hub_setup_prb(nasid,widget_num,
3,HUB_PIO_CONVEYOR); /* set the PRB in conveyor
* belt mode with 3 credits
*/
} else if (flags & HUB_PIO_FIRE_N_FORGET) {
hub_setup_prb(nasid,widget_num,
3,HUB_PIO_FIRE_N_FORGET); /* set the PRB in fire
* and forget mode
*/
}
return 1;
}
