/* $Id: jade_irq.c,v 1.7.2.4 2004/02/11 13:21:34 keil Exp $
*
* Low level JADE IRQ stuff (derived from original hscx_irq.c)
*
* Author Roland Klabunde
* Copyright by Roland Klabunde <R.Klabunde@Berkom.de>
*
* This software may be used and distributed according to the terms
* of the GNU General Public License, incorporated herein by reference.
*
*/
static inline void
waitforCEC(struct IsdnCardState *cs, int jade, int reg)
{
int to = 50;
int mask = (reg == jade_HDLC_XCMD ? jadeSTAR_XCEC : jadeSTAR_RCEC);
while ((READJADE(cs, jade, jade_HDLC_STAR) & mask) && to) {
udelay(1);
to--;
}
if (!to)
printk(KERN_WARNING "HiSax: waitforCEC (jade) timeout\n");
}
static inline void
waitforXFW(struct IsdnCardState *cs, int jade)
{
/* Does not work on older jade versions, don't care */
}
static inline void
WriteJADECMDR(struct IsdnCardState *cs, int jade, int reg, u_char data)
{
waitforCEC(cs, jade, reg);
WRITEJADE(cs, jade, reg, data);
}
static void
jade_empty_fifo(struct BCState *bcs, int count)
{
u_char *ptr;
struct IsdnCardState *cs = bcs->cs;
if ((cs->debug & L1_DEB_HSCX) && !(cs->debug & L1_DEB_HSCX_FIFO))
debugl1(cs, "jade_empty_fifo");
if (bcs->hw.hscx.rcvidx + count > HSCX_BUFMAX) {
if (cs->debug & L1_DEB_WARN)
debugl1(cs, "jade_empty_fifo: incoming packet too large");
WriteJADECMDR(cs, bcs->hw.hscx.hscx, jade_HDLC_RCMD, jadeRCMD_RMC);
bcs->hw.hscx.rcvidx = 0;
return;
}
ptr = bcs->hw.hscx.rcvbuf + bcs->hw.hscx.rcvidx;
bcs->hw.hscx.rcvidx += count;
READJADEFIFO(cs, bcs->hw.hscx.hscx, ptr, count);
WriteJADECMDR(cs, bcs->hw.hscx.hscx, jade_HDLC_RCMD, jadeRCMD_RMC);
if (cs->debug & L1_DEB_HSCX_FIFO) {
char *t = bcs->blog;
t += sprintf(t, "jade_empty_fifo %c cnt %d",
bcs->hw.hscx.hscx ? 'B' : 'A', count);
QuickHex(t, ptr, count);
debugl1(cs, bcs->blog);
}
}
static void
jade_fill_fifo(struct BCState *bcs)
{
struct IsdnCardState *cs = bcs->cs;
int more, count;
int fifo_size = 32;
u_char *ptr;
if ((cs->debug & L1_DEB_HSCX) && !(cs->debug & L1_DEB_HSCX_FIFO))
debugl1(cs, "jade_fill_fifo");
if (!bcs->tx_skb)
return;
if (bcs->tx_skb->len <= 0)
return;
more = (bcs->mode == L1_MODE_TRANS) ? 1 : 0;
if (bcs->tx_skb->len > fifo_size) {
more = !0;
count = fifo_size;
} else
count = bcs->tx_skb->len;
waitforXFW(cs, bcs->hw.hscx.hscx);
ptr = bcs->tx_skb->data;
skb_pull(bcs->tx_skb, count);
bcs->tx_cnt -= count;
bcs->hw.hscx.count += count;
WRITEJADEFIFO(cs, bcs->hw.hscx.hscx, ptr, count);
WriteJADECMDR(cs, bcs->hw.hscx.hscx, jade_HDLC_XCMD, more ? jadeXCMD_XF : (jadeXCMD_XF|jadeXCMD_XME));
if (cs->debug & L1_DEB_HSCX_FIFO) {
char *t = bcs->blog;
t += sprintf(t, "jade_fill_fifo %c cnt %d",
bcs->hw.hscx.hscx ? 'B' : 'A', count);
QuickHex(t, ptr, count);
debugl1(cs, bcs->blog);
}
}
static void
jade_interrupt(struct IsdnCardState *cs, u_char val, u_char jade)
{
u_char r;
struct BCState *bcs = cs->bcs + jade;
struct sk_buff *skb;
int fifo_size = 32;
int count;
int i_jade = (int) jade; /* To satisfy the compiler */
if (!test_bit(BC_FLG_INIT, &bcs->Flag))
return;
if (val & 0x80) { /* RME */
r = READJADE(cs, i_jade, jade_HDLC_RSTA);
if ((r & 0xf0) != 0xa0) {
if (!(r & 0x80))
if (cs->debug & L1_DEB_WARN)
debugl1(cs, "JADE %s invalid frame", (jade ? "B":"A"));
if ((r & 0x40) && bcs->mode)
if (cs->debug & L1_DEB_WARN)
debugl1(cs, "JADE %c RDO mode=%d", 'A'+jade, bcs->mode);
if (!(r & 0x20))
if (cs->debug & L1_DEB_WARN)
debugl1(cs, "JADE %c CRC error", 'A'+jade);
WriteJADECMDR(cs, jade, jade_HDLC_RCMD, jadeRCMD_RMC);
} else {
count = READJADE(cs, i_jade, jade_HDLC_RBCL) & 0x1F;
if (count == 0)
count = fifo_size;
jade_empty_fifo(bcs, count);
if ((count = bcs->hw.hscx.rcvidx - 1) > 0) {
if (cs->debug & L1_DEB_HSCX_FIFO)
debugl1(cs, "HX Frame %d", count);
if (!(skb = dev_alloc_skb(count)))
printk(KERN_WARNING "JADE %s receive out of memory\n", (jade ? "B":"A"));
else {
memcpy(skb_put(skb, count), bcs->hw.hscx.rcvbuf, count);
skb_queue_tail(&bcs->rqueue, skb);
}
}
}
bcs->hw.hscx.rcvidx = 0;
schedule_event(bcs, B_RCVBUFREADY);
}
if (val & 0x40) { /* RPF */
jade_empty_fifo(bcs, fifo_size);
if (bcs->mode == L1_MODE_TRANS) {
/* receive audio data */
if (!(skb = dev_alloc_skb(fifo_size)))
printk(KERN_WARNING "HiSax: receive out of memory\n");
else {
memcpy(skb_put(skb, fifo_size), bcs->hw.hscx.rcvbuf, fifo_size);
skb_queue_tail(&bcs->rqueue, skb);
}
bcs->hw.hscx.rcvidx = 0;
schedule_event(bcs, B_RCVBUFREADY);
}
}
if (val & 0x10) { /* XPR */
if (bcs->tx_skb) {
if (bcs->tx_skb->len) {
jade_fill_fifo(bcs);
return;
} else {
if (test_bit(FLG_LLI_L1WAKEUP,&bcs->st->lli.flag) &&
(PACKET_NOACK != bcs->tx_skb->pkt_type)) {
u_long flags;
spin_lock_irqsave(&bcs->aclock, flags);
bcs->ackcnt += bcs->hw.hscx.count;
spin_unlock_irqrestore(&bcs->aclock, flags);
schedule_event(bcs, B_ACKPENDING);
}
dev_kfree_skb_irq(bcs->tx_skb);
bcs->hw.hscx.count = 0;
bcs->tx_skb = NULL;
}
}
if ((bcs->tx_skb = skb_dequeue(&bcs->squeue))) {
bcs->hw.hscx.count = 0;
test_and_set_bit(BC_FLG_BUSY, &bcs->Flag);
jade_fill_fifo(bcs);
} else {
test_and_clear_bit(BC_FLG_BUSY, &bcs->Flag);
schedule_event(bcs, B_XMTBUFREADY);
}
}
}
static inline void
jade_int_main(struct IsdnCardState *cs, u_char val, int jade)
{
struct BCState *bcs;
bcs = cs->bcs + jade;
if (val & jadeISR_RFO) {
/* handled with RDO */
val &= ~jadeISR_RFO;
}
if (val & jadeISR_XDU) {
/* relevant in HDLC mode only */
/* don't reset XPR here */
if (bcs->mode == 1)
jade_fill_fifo(bcs);
else {
/* Here we lost an TX interrupt, so
* restart transmitting the whole frame.
*/
if (bcs->tx_skb) {
skb_push(bcs->tx_skb, bcs->hw.hscx.count);
bcs->tx_cnt += bcs->hw.hscx.count;
bcs->hw.hscx.count = 0;
}
WriteJADECMDR(cs, bcs->hw.hscx.hscx, jade_HDLC_XCMD, jadeXCMD_XRES);
if (cs->debug & L1_DEB_WARN)
debugl1(cs, "JADE %c EXIR %x Lost TX", 'A'+jade, val);
}
}
if (val & (jadeISR_RME|jadeISR_RPF|jadeISR_XPR)) {
if (cs->debug & L1_DEB_HSCX)
debugl1(cs, "JADE %c interrupt %x", 'A'+jade, val);
jade_interrupt(cs, val, jade);
}
}