w6692.c

讲述linux的初始化过程

			if (v1 & W_CIR_SCC) {
				v1 = cs->readW6692(cs, W_SQR);
				debugl1(cs, "W6692 SCC SQR=0x%02X", v1);
			}
		}
		if (exval & W_D_EXI_WEXP) {
			debugl1(cs, "W6692 spurious WEXP interrupt!");
		}
		if (exval & W_D_EXI_TEXP) {
			debugl1(cs, "W6692 spurious TEXP interrupt!");
		}
	}
	if (val & W_INT_B1_EXI) {
		debugl1(cs, "W6692 B channel 1 interrupt");
		W6692B_interrupt(cs, 0);
	}
	if (val & W_INT_B2_EXI) {
		debugl1(cs, "W6692 B channel 2 interrupt");
		W6692B_interrupt(cs, 1);
	}
	val = cs->readW6692(cs, W_ISTA);
	if (val && icnt) {
		icnt--;
		goto StartW6692;
	}
	if (!icnt) {
		printk(KERN_WARNING "W6692 IRQ LOOP\n");
		cs->writeW6692(cs, W_IMASK, 0xff);
	}
}

static void
W6692_l1hw(struct PStack *st, int pr, void *arg)
{
	struct IsdnCardState *cs = (struct IsdnCardState *) st->l1.hardware;
	struct sk_buff *skb = arg;
	int val;

	switch (pr) {
		case (PH_DATA | REQUEST):
			if (cs->debug & DEB_DLOG_HEX)
				LogFrame(cs, skb->data, skb->len);
			if (cs->debug & DEB_DLOG_VERBOSE)
				dlogframe(cs, skb, 0);
			if (cs->tx_skb) {
				skb_queue_tail(&cs->sq, skb);
#ifdef L2FRAME_DEBUG		/* psa */
				if (cs->debug & L1_DEB_LAPD)
					Logl2Frame(cs, skb, "PH_DATA Queued", 0);
#endif
			} else {
				cs->tx_skb = skb;
				cs->tx_cnt = 0;
#ifdef L2FRAME_DEBUG		/* psa */
				if (cs->debug & L1_DEB_LAPD)
					Logl2Frame(cs, skb, "PH_DATA", 0);
#endif
				W6692_fill_fifo(cs);
			}
			break;
		case (PH_PULL | INDICATION):
			if (cs->tx_skb) {
				if (cs->debug & L1_DEB_WARN)
					debugl1(cs, " l2l1 tx_skb exist this shouldn't happen");
				skb_queue_tail(&cs->sq, skb);
				break;
			}
			if (cs->debug & DEB_DLOG_HEX)
				LogFrame(cs, skb->data, skb->len);
			if (cs->debug & DEB_DLOG_VERBOSE)
				dlogframe(cs, skb, 0);
			cs->tx_skb = skb;
			cs->tx_cnt = 0;
#ifdef L2FRAME_DEBUG		/* psa */
			if (cs->debug & L1_DEB_LAPD)
				Logl2Frame(cs, skb, "PH_DATA_PULLED", 0);
#endif
			W6692_fill_fifo(cs);
			break;
		case (PH_PULL | REQUEST):
#ifdef L2FRAME_DEBUG		/* psa */
			if (cs->debug & L1_DEB_LAPD)
				debugl1(cs, "-> PH_REQUEST_PULL");
#endif
			if (!cs->tx_skb) {
				test_and_clear_bit(FLG_L1_PULL_REQ, &st->l1.Flags);
				st->l1.l1l2(st, PH_PULL | CONFIRM, NULL);
			} else
				test_and_set_bit(FLG_L1_PULL_REQ, &st->l1.Flags);
			break;
		case (HW_RESET | REQUEST):
			if ((cs->dc.w6692.ph_state == W_L1IND_DRD))
				ph_command(cs, W_L1CMD_ECK);
			else {
				ph_command(cs, W_L1CMD_RST);
				cs->dc.w6692.ph_state = W_L1CMD_RST;
				W6692_new_ph(cs);
			}
			break;
		case (HW_ENABLE | REQUEST):
			ph_command(cs, W_L1CMD_ECK);
			break;
		case (HW_INFO3 | REQUEST):
			ph_command(cs, W_L1CMD_AR8);
			break;
		case (HW_TESTLOOP | REQUEST):
			val = 0;
			if (1 & (long) arg)
				val |= 0x0c;
			if (2 & (long) arg)
				val |= 0x3;
			/* !!! not implemented yet */
			break;
		case (HW_DEACTIVATE | RESPONSE):
			discard_queue(&cs->rq);
			discard_queue(&cs->sq);
			if (cs->tx_skb) {
				dev_kfree_skb_any(cs->tx_skb);
				cs->tx_skb = NULL;
			}
			if (test_and_clear_bit(FLG_DBUSY_TIMER, &cs->HW_Flags))
				del_timer(&cs->dbusytimer);
			if (test_and_clear_bit(FLG_L1_DBUSY, &cs->HW_Flags))
				W6692_sched_event(cs, D_CLEARBUSY);
			break;
		default:
			if (cs->debug & L1_DEB_WARN)
				debugl1(cs, "W6692_l1hw unknown %04x", pr);
			break;
	}
}

static void
setstack_W6692(struct PStack *st, struct IsdnCardState *cs)
{
	st->l1.l1hw = W6692_l1hw;
}

static void
DC_Close_W6692(struct IsdnCardState *cs)
{
}

static void
dbusy_timer_handler(struct IsdnCardState *cs)
{
	struct PStack *stptr;
	int rbch, star;

	if (test_bit(FLG_DBUSY_TIMER, &cs->HW_Flags)) {
		rbch = cs->readW6692(cs, W_D_RBCH);
		star = cs->readW6692(cs, W_D_STAR);
		if (cs->debug)
			debugl1(cs, "D-Channel Busy D_RBCH %02x D_STAR %02x",
				rbch, star);
		if (star & W_D_STAR_XBZ) {	/* D-Channel Busy */
			test_and_set_bit(FLG_L1_DBUSY, &cs->HW_Flags);
			stptr = cs->stlist;
			while (stptr != NULL) {
				stptr->l1.l1l2(stptr, PH_PAUSE | INDICATION, NULL);
				stptr = stptr->next;
			}
		} else {
			/* discard frame; reset transceiver */
			test_and_clear_bit(FLG_DBUSY_TIMER, &cs->HW_Flags);
			if (cs->tx_skb) {
				dev_kfree_skb_any(cs->tx_skb);
				cs->tx_cnt = 0;
				cs->tx_skb = NULL;
			} else {
				printk(KERN_WARNING "HiSax: W6692 D-Channel Busy no skb\n");
				debugl1(cs, "D-Channel Busy no skb");
			}
			cs->writeW6692(cs, W_D_CMDR, W_D_CMDR_XRST);	/* Transmitter reset */
			cs->irq_func(cs->irq, cs, NULL);
		}
	}
}

static void
W6692Bmode(struct BCState *bcs, int mode, int bchan)
{
	struct IsdnCardState *cs = bcs->cs;

	if (cs->debug & L1_DEB_HSCX)
		debugl1(cs, "w6692 %c mode %d ichan %d",
			'1' + bchan, mode, bchan);
	bcs->mode = mode;
	bcs->channel = bchan;
	bcs->hw.w6692.bchan = bchan;

	switch (mode) {
		case (L1_MODE_NULL):
			cs->BC_Write_Reg(cs, bchan, W_B_MODE, 0);
			break;
		case (L1_MODE_TRANS):
			cs->BC_Write_Reg(cs, bchan, W_B_MODE, W_B_MODE_MMS);
			break;
		case (L1_MODE_HDLC):
			cs->BC_Write_Reg(cs, bchan, W_B_MODE, W_B_MODE_ITF);
			cs->BC_Write_Reg(cs, bchan, W_B_ADM1, 0xff);
			cs->BC_Write_Reg(cs, bchan, W_B_ADM2, 0xff);
			break;
	}
	if (mode)
		cs->BC_Write_Reg(cs, bchan, W_B_CMDR, W_B_CMDR_RRST |
				 W_B_CMDR_RACT | W_B_CMDR_XRST);
	cs->BC_Write_Reg(cs, bchan, W_B_EXIM, 0x00);
}

static void
W6692_l2l1(struct PStack *st, int pr, void *arg)
{
	struct sk_buff *skb = arg;
	long flags;

	switch (pr) {
		case (PH_DATA | REQUEST):
			save_flags(flags);
			cli();
			if (st->l1.bcs->tx_skb) {
				skb_queue_tail(&st->l1.bcs->squeue, skb);
				restore_flags(flags);
			} else {
				st->l1.bcs->tx_skb = skb;
				test_and_set_bit(BC_FLG_BUSY, &st->l1.bcs->Flag);
				st->l1.bcs->hw.w6692.count = 0;
				restore_flags(flags);
				st->l1.bcs->cs->BC_Send_Data(st->l1.bcs);
			}
			break;
		case (PH_PULL | INDICATION):
			if (st->l1.bcs->tx_skb) {
				printk(KERN_WARNING "W6692_l2l1: this shouldn't happen\n");
				break;
			}
			test_and_set_bit(BC_FLG_BUSY, &st->l1.bcs->Flag);
			st->l1.bcs->tx_skb = skb;
			st->l1.bcs->hw.w6692.count = 0;
			st->l1.bcs->cs->BC_Send_Data(st->l1.bcs);
			break;
		case (PH_PULL | REQUEST):
			if (!st->l1.bcs->tx_skb) {
				test_and_clear_bit(FLG_L1_PULL_REQ, &st->l1.Flags);
				st->l1.l1l2(st, PH_PULL | CONFIRM, NULL);
			} else
				test_and_set_bit(FLG_L1_PULL_REQ, &st->l1.Flags);
			break;
		case (PH_ACTIVATE | REQUEST):
			test_and_set_bit(BC_FLG_ACTIV, &st->l1.bcs->Flag);
			W6692Bmode(st->l1.bcs, st->l1.mode, st->l1.bc);
			l1_msg_b(st, pr, arg);
			break;
		case (PH_DEACTIVATE | REQUEST):
			l1_msg_b(st, pr, arg);
			break;
		case (PH_DEACTIVATE | CONFIRM):
			test_and_clear_bit(BC_FLG_ACTIV, &st->l1.bcs->Flag);
			test_and_clear_bit(BC_FLG_BUSY, &st->l1.bcs->Flag);
			W6692Bmode(st->l1.bcs, 0, st->l1.bc);
			st->l1.l1l2(st, PH_DEACTIVATE | CONFIRM, NULL);
			break;
	}
}

static void
close_w6692state(struct BCState *bcs)
{
	W6692Bmode(bcs, 0, bcs->channel);
	if (test_and_clear_bit(BC_FLG_INIT, &bcs->Flag)) {
		if (bcs->hw.w6692.rcvbuf) {
			kfree(bcs->hw.w6692.rcvbuf);
			bcs->hw.w6692.rcvbuf = NULL;
		}
		if (bcs->blog) {
			kfree(bcs->blog);
			bcs->blog = NULL;
		}
		discard_queue(&bcs->rqueue);
		discard_queue(&bcs->squeue);
		if (bcs->tx_skb) {
			dev_kfree_skb_any(bcs->tx_skb);
			bcs->tx_skb = NULL;
			test_and_clear_bit(BC_FLG_BUSY, &bcs->Flag);
		}
	}
}

static int
open_w6692state(struct IsdnCardState *cs, struct BCState *bcs)
{
	if (!test_and_set_bit(BC_FLG_INIT, &bcs->Flag)) {
		if (!(bcs->hw.w6692.rcvbuf = kmalloc(HSCX_BUFMAX, GFP_ATOMIC))) {
			printk(KERN_WARNING
			       "HiSax: No memory for w6692.rcvbuf\n");
			test_and_clear_bit(BC_FLG_INIT, &bcs->Flag);
			return (1);
		}
		if (!(bcs->blog = kmalloc(MAX_BLOG_SPACE, GFP_ATOMIC))) {
			printk(KERN_WARNING
			       "HiSax: No memory for bcs->blog\n");
			test_and_clear_bit(BC_FLG_INIT, &bcs->Flag);
			kfree(bcs->hw.w6692.rcvbuf);
			bcs->hw.w6692.rcvbuf = NULL;
			return (2);
		}
		skb_queue_head_init(&bcs->rqueue);
		skb_queue_head_init(&bcs->squeue);
	}
	bcs->tx_skb = NULL;
	test_and_clear_bit(BC_FLG_BUSY, &bcs->Flag);
	bcs->event = 0;
	bcs->hw.w6692.rcvidx = 0;
	bcs->tx_cnt = 0;
	return (0);
}

static int
setstack_w6692(struct PStack *st, struct BCState *bcs)
{
	bcs->channel = st->l1.bc;
	if (open_w6692state(st->l1.hardware, bcs))
		return (-1);
	st->l1.bcs = bcs;
	st->l2.l2l1 = W6692_l2l1;
	setstack_manager(st);
	bcs->st = st;
	setstack_l1_B(st);
	return (0);
}

void __init initW6692(struct IsdnCardState *cs, int part)
{
	if (part & 1) {
		cs->tqueue.routine = (void *) (void *) W6692_bh;
		cs->setstack_d = setstack_W6692;
		cs->DC_Close = DC_Close_W6692;
		cs->dbusytimer.function = (void *) dbusy_timer_handler;
		cs->dbusytimer.data = (long) cs;
		init_timer(&cs->dbusytimer);

		cs->writeW6692(cs, W_D_CTL, W_D_CTL_SRST);
		cs->writeW6692(cs, W_D_CTL, 0x00);
		cs->writeW6692(cs, W_IMASK, 0xff);
		cs->writeW6692(cs, W_D_SAM, 0xff);
		cs->writeW6692(cs, W_D_TAM, 0xff);
		cs->writeW6692(cs, W_D_EXIM, 0x00);
		cs->writeW6692(cs, W_D_MODE, W_D_MODE_RACT);
		cs->writeW6692(cs, W_IMASK, 0x18);
		ph_command(cs, W_L1CMD_RST);
		cs->dc.w6692.ph_state = W_L1CMD_RST;
		W6692_new_ph(cs);
		ph_command(cs, W_L1CMD_ECK);

		cs->bcs[0].BC_SetStack = setstack_w6692;
		cs->bcs[1].BC_SetStack = setstack_w6692;
		cs->bcs[0].BC_Close = close_w6692state;
		cs->bcs[1].BC_Close = close_w6692state;
		W6692Bmode(cs->bcs, 0, 0);
		W6692Bmode(cs->bcs + 1, 0, 0);
	}
	if (part & 2) {
		/* Reenable all IRQ */
		cs->writeW6692(cs, W_IMASK, 0x18);
		cs->writeW6692(cs, W_D_EXIM, 0x00);
		cs->BC_Write_Reg(cs, 0, W_B_EXIM, 0x00);
		cs->BC_Write_Reg(cs, 1, W_B_EXIM, 0x00);
		/* Reset D-chan receiver and transmitter */
		cs->writeW6692(cs, W_D_CMDR, W_D_CMDR_RRST | W_D_CMDR_XRST);
	}
}

/* Interface functions */

static u_char
ReadW6692(struct IsdnCardState *cs, u_char offset)
{
	return (inb(cs->hw.w6692.iobase + offset));
}

static void
WriteW6692(struct IsdnCardState *cs, u_char offset, u_char value)
{
	outb(value, cs->hw.w6692.iobase + offset);
}

static void
ReadISACfifo(struct IsdnCardState *cs, u_char * data, int size)
{
	insb(cs->hw.w6692.iobase + W_D_RFIFO, data, size);
}

static void
WriteISACfifo(struct IsdnCardState *cs, u_char * data, int size)
{
	outsb(cs->hw.w6692.iobase + W_D_XFIFO, data, size);
}

static u_char
ReadW6692B(struct IsdnCardState *cs, int bchan, u_char offset)
{
	return (inb(cs->hw.w6692.iobase + (bchan ? 0x40 : 0) + offset));
}

static void
WriteW6692B(struct IsdnCardState *cs, int bchan, u_char offset, u_char value)
{
	outb(value, cs->hw.w6692.iobase + (bchan ? 0x40 : 0) + offset);
}

static int
w6692_card_msg(struct IsdnCardState *cs, int mt, void *arg)
{
	switch (mt) {
		case CARD_RESET:
			return (0);
		case CARD_RELEASE:
			release_region(cs->hw.w6692.iobase, 256);
			return (0);
		case CARD_INIT:
			initW6692(cs, 3);
			return (0);
		case CARD_TEST:
			return (0);
	}
	return (0);
}

static int id_idx ;

static struct pci_dev *dev_w6692 __initdata = NULL;

int __init 
setup_w6692(struct IsdnCard *card)
{
	struct IsdnCardState *cs = card->cs;
	char tmp[64];
	u_char found = 0;
	u_char pci_irq = 0;
	u_int pci_ioaddr = 0;

#ifdef __BIG_ENDIAN
#error "not running on big endian machines now"
#endif
	strcpy(tmp, w6692_revision);
	printk(KERN_INFO "HiSax: W6692 driver Rev. %s\n", HiSax_getrev(tmp));
	if (cs->typ != ISDN_CTYPE_W6692)
		return (0);
#if CONFIG_PCI
	if (!pci_present()) {
		printk(KERN_ERR "W6692: no PCI bus present\n");
		return (0);
	}
	while (id_list[id_idx].vendor_id) {
		dev_w6692 = pci_find_device(id_list[id_idx].vendor_id,
					    id_list[id_idx].device_id,
					    dev_w6692);
		if (dev_w6692) {
			if (pci_enable_device(dev_w6692))
				continue;
			break;
		}
		id_idx++;
	}
	if (dev_w6692) {
		found = 1;
		pci_irq = dev_w6692->irq;
		/* I think address 0 is allways the configuration area */
		/* and address 1 is the real IO space KKe 03.09.99 */
		pci_ioaddr = pci_resource_start(dev_w6692, 1);
	}
	if (!found) {
		printk(KERN_WARNING "W6692: No PCI card found\n");
		return (0);
	}
	cs->irq = pci_irq;
	if (!cs->irq) {
		printk(KERN_WARNING "W6692: No IRQ for PCI card found\n");
		return (0);
	}
	if (!pci_ioaddr) {
		printk(KERN_WARNING "W6692: NO I/O Base Address found\n");
		return (0);
	}
	cs->hw.w6692.iobase = pci_ioaddr;
	printk(KERN_INFO "Found: %s %s, I/O base: 0x%x, irq: %d\n",
	       id_list[id_idx].vendor_name, id_list[id_idx].card_name,
	       pci_ioaddr, dev_w6692->irq);
	if (check_region((cs->hw.w6692.iobase), 256)) {
		printk(KERN_WARNING
		       "HiSax: %s I/O ports %x-%x already in use\n",
		       id_list[id_idx].card_name,
		       cs->hw.w6692.iobase,
		       cs->hw.w6692.iobase + 255);
		return (0);
	} else {
		request_region(cs->hw.w6692.iobase, 256,
			       id_list[id_idx].card_name);
	}
#else
	printk(KERN_WARNING "HiSax: W6692 and NO_PCI_BIOS\n");
	printk(KERN_WARNING "HiSax: W6692 unable to config\n");
	return (0);
#endif				/* CONFIG_PCI */

	printk(KERN_INFO
	       "HiSax: %s config irq:%d I/O:%x\n",
	       id_list[id_idx].card_name, cs->irq,
	       cs->hw.w6692.iobase);

	cs->readW6692 = &ReadW6692;
	cs->writeW6692 = &WriteW6692;
	cs->readisacfifo = &ReadISACfifo;
	cs->writeisacfifo = &WriteISACfifo;
	cs->BC_Read_Reg = &ReadW6692B;
	cs->BC_Write_Reg = &WriteW6692B;
	cs->BC_Send_Data = &W6692B_fill_fifo;
	cs->cardmsg = &w6692_card_msg;
	cs->irq_func = &W6692_interrupt;
	cs->irq_flags |= SA_SHIRQ;
	W6692Version(cs, "W6692:");
	printk(KERN_INFO "W6692 ISTA=0x%X\n", ReadW6692(cs, W_ISTA));
	printk(KERN_INFO "W6692 IMASK=0x%X\n", ReadW6692(cs, W_IMASK));
	printk(KERN_INFO "W6692 D_EXIR=0x%X\n", ReadW6692(cs, W_D_EXIR));
	printk(KERN_INFO "W6692 D_EXIM=0x%X\n", ReadW6692(cs, W_D_EXIM));
	printk(KERN_INFO "W6692 D_RSTA=0x%X\n", ReadW6692(cs, W_D_RSTA));
	return (1);
}