hfc_2bds0.c

自己根据lkd和情境分析

/* $Id: hfc_2bds0.c,v 1.1.1.1 2004/02/04 12:56:17 laputa Exp $
 *
 * specific routines for CCD's HFC 2BDS0
 *
 * Author       Karsten Keil
 * Copyright    by Karsten Keil      <[e-mail]>
 * 
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 *
 */

#define __NO_VERSION__
#include <linux/init.h>
#include "hisax.h"
#include "hfc_2bds0.h"
#include "isdnl1.h"
#include <linux/interrupt.h>
/*
#define KDEBUG_DEF
#include "kdebug.h"
*/

#define byteout(addr,val) outb(val,addr)
#define bytein(addr) inb(addr)

static void
dummyf(struct IsdnCardState *cs, u_char * data, int size)
{
	printk(KERN_WARNING "HiSax: hfcd dummy fifo called\n");
}

static inline u_char
ReadReg(struct IsdnCardState *cs, int data, u_char reg)
{
	register u_char ret;

	if (data) {
		if (cs->hw.hfcD.cip != reg) { 
			cs->hw.hfcD.cip = reg;
			byteout(cs->hw.hfcD.addr | 1, reg);
		}
		ret = bytein(cs->hw.hfcD.addr);
#if HFC_REG_DEBUG
		if (cs->debug & L1_DEB_HSCX_FIFO && (data != 2))
			debugl1(cs, "t3c RD %02x %02x", reg, ret);
#endif
	} else
		ret = bytein(cs->hw.hfcD.addr | 1);
	return (ret);
}

static inline void
WriteReg(struct IsdnCardState *cs, int data, u_char reg, u_char value)
{
	if (cs->hw.hfcD.cip != reg) { 
		cs->hw.hfcD.cip = reg;
		byteout(cs->hw.hfcD.addr | 1, reg);
	}
	if (data)
		byteout(cs->hw.hfcD.addr, value);
#if HFC_REG_DEBUG
	if (cs->debug & L1_DEB_HSCX_FIFO && (data != HFCD_DATA_NODEB))
		debugl1(cs, "t3c W%c %02x %02x", data ? 'D' : 'C', reg, value);
#endif
}

/* Interface functions */

static u_char
readreghfcd(struct IsdnCardState *cs, u_char offset)
{
	return(ReadReg(cs, HFCD_DATA, offset));
}

static void
writereghfcd(struct IsdnCardState *cs, u_char offset, u_char value)
{
	WriteReg(cs, HFCD_DATA, offset, value);
}

void
set_cs_func(struct IsdnCardState *cs)
{
	cs->readisac = &readreghfcd;
	cs->writeisac = &writereghfcd;
	cs->readisacfifo = &dummyf;
	cs->writeisacfifo = &dummyf;
	cs->BC_Read_Reg = &ReadReg;
	cs->BC_Write_Reg = &WriteReg;
}

static inline int
WaitForBusy(struct IsdnCardState *cs)
{
	int to = 130;

	while (!(ReadReg(cs, HFCD_DATA, HFCD_STAT) & HFCD_BUSY) && to) {
		udelay(1);
		to--;
	}
	if (!to)
		printk(KERN_WARNING "HiSax: WaitForBusy timeout\n");
	return (to);
}

static inline int
WaitNoBusy(struct IsdnCardState *cs)
{
	long flags;
	int to = 130;

	while ((ReadReg(cs, HFCD_STATUS, HFCD_STATUS) & HFCD_BUSY) && to) {
		save_flags(flags);
		sti();
		udelay(1);
		to--;
		restore_flags(flags);
	}
	if (!to) 
		printk(KERN_WARNING "HiSax: WaitNoBusy timeout\n");
	return (to);
}

static int
SelFiFo(struct IsdnCardState *cs, u_char FiFo)
{
	u_char cip;
	long flags;


	if (cs->hw.hfcD.fifo == FiFo)
		return(1);
	save_flags(flags);
	cli();
	switch(FiFo) {
		case 0: cip = HFCB_FIFO | HFCB_Z1 | HFCB_SEND | HFCB_B1;
			break;
		case 1: cip = HFCB_FIFO | HFCB_Z1 | HFCB_REC | HFCB_B1;
			break;
		case 2: cip = HFCB_FIFO | HFCB_Z1 | HFCB_SEND | HFCB_B2;
			break;
		case 3: cip = HFCB_FIFO | HFCB_Z1 | HFCB_REC | HFCB_B2;
			break;
		case 4: cip = HFCD_FIFO | HFCD_Z1 | HFCD_SEND;
			break;
		case 5: cip = HFCD_FIFO | HFCD_Z1 | HFCD_REC;
			break;
		default:
			restore_flags(flags);
			debugl1(cs, "SelFiFo Error");
			return(0);
	}
	cs->hw.hfcD.fifo = FiFo;
	WaitNoBusy(cs);
	cs->BC_Write_Reg(cs, HFCD_DATA, cip, 0);
	sti();
	WaitForBusy(cs);
	restore_flags(flags);
	return(2);
}
static int
GetFreeFifoBytes_B(struct BCState *bcs)
{
	int s;

	if (bcs->hw.hfc.f1 == bcs->hw.hfc.f2)
		return (bcs->cs->hw.hfcD.bfifosize);
	s = bcs->hw.hfc.send[bcs->hw.hfc.f1] - bcs->hw.hfc.send[bcs->hw.hfc.f2];
	if (s <= 0)
		s += bcs->cs->hw.hfcD.bfifosize;
	s = bcs->cs->hw.hfcD.bfifosize - s;
	return (s);
}

static int
GetFreeFifoBytes_D(struct IsdnCardState *cs)
{
	int s;

	if (cs->hw.hfcD.f1 == cs->hw.hfcD.f2)
		return (cs->hw.hfcD.dfifosize);
	s = cs->hw.hfcD.send[cs->hw.hfcD.f1] - cs->hw.hfcD.send[cs->hw.hfcD.f2];
	if (s <= 0)
		s += cs->hw.hfcD.dfifosize;
	s = cs->hw.hfcD.dfifosize - s;
	return (s);
}

static int
ReadZReg(struct IsdnCardState *cs, u_char reg)
{
	int val;

	WaitNoBusy(cs);
	val = 256 * ReadReg(cs, HFCD_DATA, reg | HFCB_Z_HIGH);
	WaitNoBusy(cs);
	val += ReadReg(cs, HFCD_DATA, reg | HFCB_Z_LOW);
	return (val);
}

static void
hfc_sched_event(struct BCState *bcs, int event)
{
	bcs->event |= 1 << event;
	queue_task(&bcs->tqueue, &tq_immediate);
	mark_bh(IMMEDIATE_BH);
}

static struct sk_buff
*hfc_empty_fifo(struct BCState *bcs, int count)
{
	u_char *ptr;
	struct sk_buff *skb;
	struct IsdnCardState *cs = bcs->cs;
	int idx;
	int chksum;
	long flags;
	u_char stat, cip;
	
	if ((cs->debug & L1_DEB_HSCX) && !(cs->debug & L1_DEB_HSCX_FIFO))
		debugl1(cs, "hfc_empty_fifo");
	idx = 0;
	save_flags(flags);
	if (count > HSCX_BUFMAX + 3) {
		if (cs->debug & L1_DEB_WARN)
			debugl1(cs, "hfc_empty_fifo: incoming packet too large");
		cip = HFCB_FIFO | HFCB_FIFO_OUT | HFCB_REC | HFCB_CHANNEL(bcs->channel);
		while (idx++ < count) {
			cli();
			WaitNoBusy(cs);
			ReadReg(cs, HFCD_DATA_NODEB, cip);
			sti();
		}
		skb = NULL;
	} else if (count < 4) {
		if (cs->debug & L1_DEB_WARN)
			debugl1(cs, "hfc_empty_fifo: incoming packet too small");
		cip = HFCB_FIFO | HFCB_FIFO_OUT | HFCB_REC | HFCB_CHANNEL(bcs->channel);
#ifdef ERROR_STATISTIC
		bcs->err_inv++;
#endif
		cli();
		while ((idx++ < count) && WaitNoBusy(cs))
			ReadReg(cs, HFCD_DATA_NODEB, cip);
		skb = NULL;
	} else if (!(skb = dev_alloc_skb(count - 3)))
		printk(KERN_WARNING "HFC: receive out of memory\n");
	else {
		ptr = skb_put(skb, count - 3);
		idx = 0;
		cip = HFCB_FIFO | HFCB_FIFO_OUT | HFCB_REC | HFCB_CHANNEL(bcs->channel);
		cli();
		while (idx < (count - 3)) {
			cli();
			if (!WaitNoBusy(cs))
				break;
			*ptr = ReadReg(cs,  HFCD_DATA_NODEB, cip);
			sti();
			ptr++;
			idx++;
		}
		if (idx != count - 3) {
			sti();
			debugl1(cs, "RFIFO BUSY error");
			printk(KERN_WARNING "HFC FIFO channel %d BUSY Error\n", bcs->channel);
			dev_kfree_skb_irq(skb);
			skb = NULL;
		} else {
			cli();
			WaitNoBusy(cs);
			chksum = (ReadReg(cs, HFCD_DATA, cip) << 8);
			WaitNoBusy(cs);
			chksum += ReadReg(cs, HFCD_DATA, cip);
			WaitNoBusy(cs);
			stat = ReadReg(cs, HFCD_DATA, cip);
			sti();
			if (cs->debug & L1_DEB_HSCX)
				debugl1(cs, "hfc_empty_fifo %d chksum %x stat %x",
					bcs->channel, chksum, stat);
			if (stat) {
				debugl1(cs, "FIFO CRC error");
				dev_kfree_skb_irq(skb);
				skb = NULL;
#ifdef ERROR_STATISTIC
				bcs->err_crc++;
#endif
			}
		}
	}
	sti();
	WaitForBusy(cs);
	cli();
	WaitNoBusy(cs);
	stat = ReadReg(cs, HFCD_DATA, HFCB_FIFO | HFCB_F2_INC |
		HFCB_REC | HFCB_CHANNEL(bcs->channel));
	sti();
	WaitForBusy(cs);
	restore_flags(flags);
	return (skb);
}

static void
hfc_fill_fifo(struct BCState *bcs)
{
	struct IsdnCardState *cs = bcs->cs;
	long flags;
	int idx, fcnt;
	int count;
	u_char cip;

	if (!bcs->tx_skb)
		return;
	if (bcs->tx_skb->len <= 0)
		return;
	save_flags(flags);
	cli();
	SelFiFo(cs, HFCB_SEND | HFCB_CHANNEL(bcs->channel)); 
	cip = HFCB_FIFO | HFCB_F1 | HFCB_SEND | HFCB_CHANNEL(bcs->channel);
	WaitNoBusy(cs);
	bcs->hw.hfc.f1 = ReadReg(cs, HFCD_DATA, cip);
	WaitNoBusy(cs);
	cip = HFCB_FIFO | HFCB_F2 | HFCB_SEND | HFCB_CHANNEL(bcs->channel);
	WaitNoBusy(cs);
	bcs->hw.hfc.f2 = ReadReg(cs, HFCD_DATA, cip);
	bcs->hw.hfc.send[bcs->hw.hfc.f1] = ReadZReg(cs, HFCB_FIFO | HFCB_Z1 | HFCB_SEND | HFCB_CHANNEL(bcs->channel));
	sti();
 	if (cs->debug & L1_DEB_HSCX)
		debugl1(cs, "hfc_fill_fifo %d f1(%d) f2(%d) z1(%x)",
			bcs->channel, bcs->hw.hfc.f1, bcs->hw.hfc.f2,
			bcs->hw.hfc.send[bcs->hw.hfc.f1]);
	fcnt = bcs->hw.hfc.f1 - bcs->hw.hfc.f2;
	if (fcnt < 0)
		fcnt += 32;
	if (fcnt > 30) {
		if (cs->debug & L1_DEB_HSCX)
			debugl1(cs, "hfc_fill_fifo more as 30 frames");
		restore_flags(flags);
		return;
	}
	count = GetFreeFifoBytes_B(bcs);
	if (cs->debug & L1_DEB_HSCX)
		debugl1(cs, "hfc_fill_fifo %d count(%ld/%d),%lx",
			bcs->channel, bcs->tx_skb->len,
			count, current->state);
	if (count < bcs->tx_skb->len) {
		if (cs->debug & L1_DEB_HSCX)
			debugl1(cs, "hfc_fill_fifo no fifo mem");
		restore_flags(flags);
		return;
	}
	cip = HFCB_FIFO | HFCB_FIFO_IN | HFCB_SEND | HFCB_CHANNEL(bcs->channel);
	idx = 0;
	cli();
	WaitForBusy(cs);
	WaitNoBusy(cs);
	WriteReg(cs, HFCD_DATA_NODEB, cip, bcs->tx_skb->data[idx++]);
	while (idx < bcs->tx_skb->len) {
		cli();
		if (!WaitNoBusy(cs))
			break;
		WriteReg(cs, HFCD_DATA_NODEB, cip, bcs->tx_skb->data[idx]);
		sti();
		idx++;
	}
	if (idx != bcs->tx_skb->len) {
		sti();
		debugl1(cs, "FIFO Send BUSY error");
		printk(KERN_WARNING "HFC S FIFO channel %d BUSY Error\n", bcs->channel);
	} else {
		bcs->tx_cnt -= bcs->tx_skb->len;
		if (bcs->st->lli.l1writewakeup &&
			(PACKET_NOACK != bcs->tx_skb->pkt_type))
			bcs->st->lli.l1writewakeup(bcs->st, bcs->tx_skb->len);
		dev_kfree_skb_any(bcs->tx_skb);
		bcs->tx_skb = NULL;
	}
	WaitForBusy(cs);
	cli();
	WaitNoBusy(cs);
	ReadReg(cs, HFCD_DATA, HFCB_FIFO | HFCB_F1_INC | HFCB_SEND | HFCB_CHANNEL(bcs->channel));
	sti();
	WaitForBusy(cs);
	test_and_clear_bit(BC_FLG_BUSY, &bcs->Flag);
	restore_flags(flags);
	return;
}

static void
hfc_send_data(struct BCState *bcs)
{
	struct IsdnCardState *cs = bcs->cs;
	
	if (!test_and_set_bit(FLG_LOCK_ATOMIC, &cs->HW_Flags)) {
		hfc_fill_fifo(bcs);
		test_and_clear_bit(FLG_LOCK_ATOMIC, &cs->HW_Flags);
	} else
		debugl1(cs,"send_data %d blocked", bcs->channel);
}

void
main_rec_2bds0(struct BCState *bcs)
{
	long flags;
	struct IsdnCardState *cs = bcs->cs;
	int z1, z2, rcnt;
	u_char f1, f2, cip;
	int receive, count = 5;
	struct sk_buff *skb;

	save_flags(flags);
    Begin:
	count--;
	cli();
	if (test_and_set_bit(FLG_LOCK_ATOMIC, &cs->HW_Flags)) {
		debugl1(cs,"rec_data %d blocked", bcs->channel);
		restore_flags(flags);
		return;
	}
	SelFiFo(cs, HFCB_REC | HFCB_CHANNEL(bcs->channel));
	cip = HFCB_FIFO | HFCB_F1 | HFCB_REC | HFCB_CHANNEL(bcs->channel);
	WaitNoBusy(cs);
	f1 = ReadReg(cs, HFCD_DATA, cip);
	cip = HFCB_FIFO | HFCB_F2 | HFCB_REC | HFCB_CHANNEL(bcs->channel);
	WaitNoBusy(cs);
	f2 = ReadReg(cs, HFCD_DATA, cip);
	sti();
	if (f1 != f2) {
		if (cs->debug & L1_DEB_HSCX)
			debugl1(cs, "hfc rec %d f1(%d) f2(%d)",
				bcs->channel, f1, f2);
		cli();
		z1 = ReadZReg(cs, HFCB_FIFO | HFCB_Z1 | HFCB_REC | HFCB_CHANNEL(bcs->channel));
		z2 = ReadZReg(cs, HFCB_FIFO | HFCB_Z2 | HFCB_REC | HFCB_CHANNEL(bcs->channel));
		sti();
		rcnt = z1 - z2;
		if (rcnt < 0)
			rcnt += cs->hw.hfcD.bfifosize;
		rcnt++;
		if (cs->debug & L1_DEB_HSCX)
			debugl1(cs, "hfc rec %d z1(%x) z2(%x) cnt(%d)",
				bcs->channel, z1, z2, rcnt);
		if ((skb = hfc_empty_fifo(bcs, rcnt))) {
			cli();
			skb_queue_tail(&bcs->rqueue, skb);
			sti();
			hfc_sched_event(bcs, B_RCVBUFREADY);
		}
		rcnt = f1 -f2;
		if (rcnt<0)
			rcnt += 32;
		if (rcnt>1)
			receive = 1;
		else
			receive = 0;
	} else
		receive = 0;
	test_and_clear_bit(FLG_LOCK_ATOMIC, &cs->HW_Flags);
	if (count && receive)
		goto Begin;	
	restore_flags(flags);
	return;
}

void
mode_2bs0(struct BCState *bcs, int mode, int bc)
{
	struct IsdnCardState *cs = bcs->cs;

	if (cs->debug & L1_DEB_HSCX)
		debugl1(cs, "HFCD bchannel mode %d bchan %d/%d",
			mode, bc, bcs->channel);
	bcs->mode = mode;
	bcs->channel = bc;
	switch (mode) {
		case (L1_MODE_NULL):
			if (bc) {
				cs->hw.hfcD.conn |= 0x18;
				cs->hw.hfcD.sctrl &= ~SCTRL_B2_ENA;
			} else {
				cs->hw.hfcD.conn |= 0x3;
				cs->hw.hfcD.sctrl &= ~SCTRL_B1_ENA;
			}
			break;
		case (L1_MODE_TRANS):
			if (bc) {
				cs->hw.hfcD.ctmt |= 2;
				cs->hw.hfcD.conn &= ~0x18;
				cs->hw.hfcD.sctrl |= SCTRL_B2_ENA;
			} else {
				cs->hw.hfcD.ctmt |= 1;
				cs->hw.hfcD.conn &= ~0x3;
				cs->hw.hfcD.sctrl |= SCTRL_B1_ENA;
			}
			break;
		case (L1_MODE_HDLC):
			if (bc) {
				cs->hw.hfcD.ctmt &= ~2;
				cs->hw.hfcD.conn &= ~0x18;
				cs->hw.hfcD.sctrl |= SCTRL_B2_ENA;
			} else {
				cs->hw.hfcD.ctmt &= ~1;
				cs->hw.hfcD.conn &= ~0x3;
				cs->hw.hfcD.sctrl |= SCTRL_B1_ENA;
			}
			break;
	}
	WriteReg(cs, HFCD_DATA, HFCD_SCTRL, cs->hw.hfcD.sctrl);
	WriteReg(cs, HFCD_DATA, HFCD_CTMT, cs->hw.hfcD.ctmt);
	WriteReg(cs, HFCD_DATA, HFCD_CONN, cs->hw.hfcD.conn);
}

static void
hfc_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->cs->BC_Send_Data(st->l1.bcs);
				restore_flags(flags);
			}
			break;
		case (PH_PULL | INDICATION):
			if (st->l1.bcs->tx_skb) {
				printk(KERN_WARNING "hfc_l2l1: this shouldn't happen\n");
				break;
			}
			save_flags(flags);
			cli();
/*			test_and_set_bit(BC_FLG_BUSY, &st->l1.bcs->Flag);
*/			st->l1.bcs->tx_skb = skb;
			st->l1.bcs->cs->BC_Send_Data(st->l1.bcs);
			restore_flags(flags);
			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);
			mode_2bs0(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);
			mode_2bs0(st->l1.bcs, 0, st->l1.bc);
			st->l1.l1l2(st, PH_DEACTIVATE | CONFIRM, NULL);
			break;
	}
}

void
close_2bs0(struct BCState *bcs)
{
	mode_2bs0(bcs, 0, bcs->channel);
	if (test_and_clear_bit(BC_FLG_INIT, &bcs->Flag)) {
		skb_queue_purge(&bcs->rqueue);
		skb_queue_purge(&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);
		}
	}
}