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Improve interlocking for card removal. We now can remove the card in

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the ISR.  We keep track of the card state and don't call the IRS when
the card isn't inserted.  This helps quite a bit with card ejection
problems that Ian was seeing.

Submitted by: Ian Dowse
MFC upon: re approvel.
This commit is contained in:
Warner Losh 2001-08-19 05:01:18 +00:00
parent aad8d98833
commit 6ac061b532
3 changed files with 60 additions and 28 deletions
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82
sys/pccard/pcic_pci.c
View File

@ -438,25 +438,36 @@ pcic_pci_cardtype(u_int32_t stat)
return ("none (can't happen)");
}
/*
* Card insertion and removal code. The insertion events need to be
* debounced so that the noisy insertion/removal events don't result
* in the hardware being initialized many times, only to be torn down
* as well. This may also cause races with pccardd. Instead, we wait
* for the insertion signal to be stable for 0.5 seconds before we declare
* it to be a real insertion event. Removal is done right away.
*
* Note: We only handle the card detect change events. We don't handle
* power events and status change events.
*/
static void
pcic_cd_event(void *arg)
pcic_cd_insert(void *arg)
{
struct pcic_softc *sc = (struct pcic_softc *) arg;
struct pcic_slot *sp = &sc->slots[0];
u_int32_t stat;
sc->cd_pending = 0;
stat = bus_space_read_4(sp->bst, sp->bsh, CB_SOCKET_STATE);
device_printf(sc->dev, "debounced state is 0x%x\n", stat);
if ((stat & CB_SS_CD) == 0) {
if ((stat & CB_SS_16BIT) == 0)
device_printf(sp->sc->dev, "Unsupported card: %s\n",
pcic_pci_cardtype(stat));
else
pccard_event(sp->slt, card_inserted);
} else {
pccard_event(sp->slt, card_removed);
}
sc->cd_pending = 0;
/* Just return if the interrupt handler missed a remove transition. */
if ((stat & CB_SS_CD) != 0)
return;
sc->cd_present = 1;
if ((stat & CB_SS_16BIT) == 0)
device_printf(sp->sc->dev, "Card type %s is unsupported\n",
pcic_pci_cardtype(stat));
else
pccard_event(sp->slt, card_inserted);
}
static void
@ -466,20 +477,37 @@ pcic_pci_intr(void *arg)
struct pcic_slot *sp = &sc->slots[0];
u_int32_t event;
u_int32_t stat;
int present;
event = bus_space_read_4(sp->bst, sp->bsh, CB_SOCKET_EVENT);
if (event != 0) {
device_printf(sc->dev, "Event mask 0x%x\n", event);
if ((event & CB_SE_CD) != 0 && !sc->cd_pending) {
sc->cd_pending = 1;
timeout(pcic_cd_event, arg, hz/2);
stat = bus_space_read_4(sp->bst, sp->bsh, CB_SOCKET_STATE);
if (bootverbose)
device_printf(sc->dev, "Event mask 0x%x stat 0x%x\n",
event, stat);
present = (stat & CB_SS_CD) == 0;
if (present != sc->cd_present) {
if (sc->cd_pending) {
untimeout(pcic_cd_insert, arg, sc->cd_ch);
sc->cd_pending = 0;
}
/* Delay insert events to debounce noisy signals. */
if (present) {
sc->cd_ch = timeout(pcic_cd_insert, arg, hz/2);
sc->cd_pending = 1;
} else {
sc->cd_present = 0;
sp->intr = NULL;
pccard_event(sp->slt, card_removed);
}
}
/* Ack the interrupt, all of them to be safe */
bus_space_write_4(sp->bst, sp->bsh, 0, 0xffffffff);
/* Ack the interrupt */
bus_space_write_4(sp->bst, sp->bsh, 0, event);
}
/*
* TI chips also require us to read the old ExCA register for
* Some TI chips also require us to read the old ExCA register for
* card status change when we route CSC via PCI! So, we go ahead
* and read it to clear the bits. Maybe we should check the status
* ala the ISA interrupt handler, but those changes should be caught
@ -487,12 +515,14 @@ pcic_pci_intr(void *arg)
*/
sp->getb(sp, PCIC_STAT_CHG);
/* Now call children interrupts if any */
stat = bus_space_read_4(sp->bst, sp->bsh, CB_SOCKET_STATE);
if ((stat & CB_SS_CD) == 0) {
if (sp->intr != NULL)
sp->intr(sp->argp);
}
/*
* If we have a card in the slot with an interrupt handler, then
* call it. Note: This means that each card can have at most one
* interrupt handler for it. Since multifunction cards aren't
* supported, this shouldn't cause a problem in practice.
*/
if (sc->cd_present && sp->intr != NULL)
sp->intr(sp->argp);
}
/*

2
sys/pccard/pcic_pci.h
View File

@ -144,8 +144,8 @@
#define CB_SOCKET_POWER 0x14
#define CB_EXCA_OFFSET 0x800 /* Offset for ExCA registers */
#define CB_SM_CD 0x6 /* Socket MASK Card detect */
#define CB_SE_CD 0x6 /* Socket Event Card detect */
#define CB_SM_CD 0x6 /* Socket MASK Card detect */
#define CB_SS_CARDSTS 0x00000001 /* Card Status Change */
#define CB_SS_CD1 0x00000002 /* Card Detect 1 */

4
sys/pccard/pcicvar.h
View File

@ -67,7 +67,9 @@ struct pcic_softc
void (*slot_poll)(void *);
struct callout_handle timeout_ch;
struct pcic_slot slots[PCIC_MAX_SLOTS];
int cd_pending;
int cd_pending; /* debounce timeout active */
int cd_present; /* debounced card-present state */
struct callout_handle cd_ch; /* handle for pcic_cd_insert */
};
extern devclass_t pcic_devclass;