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/* $Id: hscx_irq.c,v 1.1.4.1 2001/11/20 14:19:36 kai Exp $
*
* low level b-channel stuff for Siemens HSCX
*
* Author Karsten Keil
* Copyright by Karsten Keil <keil@isdn4linux.de>
*
* This software may be used and distributed according to the terms
* of the GNU General Public License, incorporated herein by reference.
*
* This is an include file for fast inline IRQ stuff
*
*/
static inline void
waitforCEC(struct IsdnCardState *cs, int hscx)
{
int to = 50;
while ((READHSCX(cs, hscx, HSCX_STAR) & 0x04) && to) {
udelay(1);
to--;
}
if (!to)
printk(KERN_WARNING "HiSax: waitforCEC timeout\n");
}
static inline void
waitforXFW(struct IsdnCardState *cs, int hscx)
{
int to = 50;
while ((!(READHSCX(cs, hscx, HSCX_STAR) & 0x44) == 0x40) && to) {
udelay(1);
to--;
}
if (!to)
printk(KERN_WARNING "HiSax: waitforXFW timeout\n");
}
static inline void
WriteHSCXCMDR(struct IsdnCardState *cs, int hscx, u_char data)
{
long flags;
save_flags(flags);
cli();
waitforCEC(cs, hscx);
WRITEHSCX(cs, hscx, HSCX_CMDR, data);
restore_flags(flags);
}
static void
hscx_empty_fifo(struct BCState *bcs, int count)
{
u_char *ptr;
struct IsdnCardState *cs = bcs->cs;
long flags;
if ((cs->debug & L1_DEB_HSCX) && !(cs->debug & L1_DEB_HSCX_FIFO))
debugl1(cs, "hscx_empty_fifo");
if (bcs->hw.hscx.rcvidx + count > HSCX_BUFMAX) {
if (cs->debug & L1_DEB_WARN)
debugl1(cs, "hscx_empty_fifo: incoming packet too large");
WriteHSCXCMDR(cs, bcs->hw.hscx.hscx, 0x80);
bcs->hw.hscx.rcvidx = 0;
return;
}
ptr = bcs->hw.hscx.rcvbuf + bcs->hw.hscx.rcvidx;
bcs->hw.hscx.rcvidx += count;
save_flags(flags);
cli();
READHSCXFIFO(cs, bcs->hw.hscx.hscx, ptr, count);
WriteHSCXCMDR(cs, bcs->hw.hscx.hscx, 0x80);
restore_flags(flags);
if (cs->debug & L1_DEB_HSCX_FIFO) {
char *t = bcs->blog;
t += sprintf(t, "hscx_empty_fifo %c cnt %d",
bcs->hw.hscx.hscx ? 'B' : 'A', count);
QuickHex(t, ptr, count);
debugl1(cs, bcs->blog);
}
}
static void
hscx_fill_fifo(struct BCState *bcs)
{
struct IsdnCardState *cs = bcs->cs;
int more, count;
int fifo_size = test_bit(HW_IPAC, &cs->HW_Flags)? 64: 32;
u_char *ptr;
long flags;
if ((cs->debug & L1_DEB_HSCX) && !(cs->debug & L1_DEB_HSCX_FIFO))
debugl1(cs, "hscx_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);
save_flags(flags);
cli();
ptr = bcs->tx_skb->data;
skb_pull(bcs->tx_skb, count);
bcs->tx_cnt -= count;
bcs->hw.hscx.count += count;
WRITEHSCXFIFO(cs, bcs->hw.hscx.hscx, ptr, count);
WriteHSCXCMDR(cs, bcs->hw.hscx.hscx, more ? 0x8 : 0xa);
restore_flags(flags);
if (cs->debug & L1_DEB_HSCX_FIFO) {
char *t = bcs->blog;
t += sprintf(t, "hscx_fill_fifo %c cnt %d",
bcs->hw.hscx.hscx ? 'B' : 'A', count);
QuickHex(t, ptr, count);
debugl1(cs, bcs->blog);
}
}
static inline void
hscx_interrupt(struct IsdnCardState *cs, u_char val, u_char hscx)
{
u_char r;
struct BCState *bcs = cs->bcs + hscx;
struct sk_buff *skb;
int fifo_size = test_bit(HW_IPAC, &cs->HW_Flags)? 64: 32;
int count;
if (!test_bit(BC_FLG_INIT, &bcs->Flag))
return;
if (val & 0x80) { /* RME */
r = READHSCX(cs, hscx, HSCX_RSTA);
if ((r & 0xf0) != 0xa0) {
if (!(r & 0x80)) {
if (cs->debug & L1_DEB_WARN)
debugl1(cs, "HSCX invalid frame");
#ifdef ERROR_STATISTIC
bcs->err_inv++;
#endif
}
if ((r & 0x40) && bcs->mode) {
if (cs->debug & L1_DEB_WARN)
debugl1(cs, "HSCX RDO mode=%d",
bcs->mode);
#ifdef ERROR_STATISTIC
bcs->err_rdo++;
#endif
}
if (!(r & 0x20)) {
if (cs->debug & L1_DEB_WARN)
debugl1(cs, "HSCX CRC error");
#ifdef ERROR_STATISTIC
bcs->err_crc++;
#endif
}
WriteHSCXCMDR(cs, hscx, 0x80);
} else {
count = READHSCX(cs, hscx, HSCX_RBCL) & (
test_bit(HW_IPAC, &cs->HW_Flags)? 0x3f: 0x1f);
if (count == 0)
count = fifo_size;
hscx_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 "HSCX: receive out of memory\n");
else {
memcpy(skb_put(skb, count), bcs->hw.hscx.rcvbuf, count);
skb_queue_tail(&bcs->rqueue, skb);
}
}
}
bcs->hw.hscx.rcvidx = 0;
hscx_sched_event(bcs, B_RCVBUFREADY);
}
if (val & 0x40) { /* RPF */
hscx_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;
hscx_sched_event(bcs, B_RCVBUFREADY);
}
}
if (val & 0x10) { /* XPR */
if (bcs->tx_skb) {
if (bcs->tx_skb->len) {
hscx_fill_fifo(bcs);
return;
} else {
if (bcs->st->lli.l1writewakeup &&
(PACKET_NOACK != bcs->tx_skb->pkt_type))
bcs->st->lli.l1writewakeup(bcs->st, bcs->hw.hscx.count);
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);
hscx_fill_fifo(bcs);
} else {
test_and_clear_bit(BC_FLG_BUSY, &bcs->Flag);
hscx_sched_event(bcs, B_XMTBUFREADY);
}
}
}
static inline void
hscx_int_main(struct IsdnCardState *cs, u_char val)
{
u_char exval;
struct BCState *bcs;
if (val & 0x01) {
bcs = cs->bcs + 1;
exval = READHSCX(cs, 1, HSCX_EXIR);
if (exval & 0x40) {
if (bcs->mode == 1)
hscx_fill_fifo(bcs);
else {
#ifdef ERROR_STATISTIC
bcs->err_tx++;
#endif
/* 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;
}
WriteHSCXCMDR(cs, bcs->hw.hscx.hscx, 0x01);
if (cs->debug & L1_DEB_WARN)
debugl1(cs, "HSCX B EXIR %x Lost TX", exval);
}
} else if (cs->debug & L1_DEB_HSCX)
debugl1(cs, "HSCX B EXIR %x", exval);
}
if (val & 0xf8) {
if (cs->debug & L1_DEB_HSCX)
debugl1(cs, "HSCX B interrupt %x", val);
hscx_interrupt(cs, val, 1);
}
if (val & 0x02) {
bcs = cs->bcs;
exval = READHSCX(cs, 0, HSCX_EXIR);
if (exval & 0x40) {
if (bcs->mode == L1_MODE_TRANS)
hscx_fill_fifo(bcs);
else {
/* Here we lost an TX interrupt, so
* restart transmitting the whole frame.
*/
#ifdef ERROR_STATISTIC
bcs->err_tx++;
#endif
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;
}
WriteHSCXCMDR(cs, bcs->hw.hscx.hscx, 0x01);
if (cs->debug & L1_DEB_WARN)
debugl1(cs, "HSCX A EXIR %x Lost TX", exval);
}
} else if (cs->debug & L1_DEB_HSCX)
debugl1(cs, "HSCX A EXIR %x", exval);
}
if (val & 0x04) {
exval = READHSCX(cs, 0, HSCX_ISTA);
if (cs->debug & L1_DEB_HSCX)
debugl1(cs, "HSCX A interrupt %x", exval);
hscx_interrupt(cs, exval, 0);
}
}
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