hscx_irq.c 7.1 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121
/* $Id: hscx_irq.c,v 1.18.2.3 2004/02/11 13:21:34 keil 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)
{
	waitforCEC(cs, hscx);
	WRITEHSCX(cs, hscx, HSCX_CMDR, data);
}



static void
hscx_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, "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;
	READHSCXFIFO(cs, bcs->hw.hscx.hscx, ptr, count);
	WriteHSCXCMDR(cs, bcs->hw.hscx.hscx, 0x80);
	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;

	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);
	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);
	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);
	}
}

122
static void
Linus Torvalds's avatar
Linus Torvalds committed
123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223
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;
		schedule_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;
			schedule_event(bcs, B_RCVBUFREADY);
		}
	}
	if (val & 0x10) {	/* XPR */
		if (bcs->tx_skb) {
			if (bcs->tx_skb->len) {
				hscx_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);
			hscx_fill_fifo(bcs);
		} else {
			test_and_clear_bit(BC_FLG_BUSY, &bcs->Flag);
			schedule_event(bcs, B_XMTBUFREADY);
		}
	}
}

224
static void
Linus Torvalds's avatar
Linus Torvalds committed
225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292
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);
	}
}