path: root/drivers/isdn/hisax/ipacx.c

/* 
 *
 * IPACX specific routines
 *
 * Author       Joerg Petersohn
 * Derived from hisax_isac.c, isac.c, hscx.c and others
 * 
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 *
 */
#include <linux/kernel.h>
#include <linux/init.h>
#include "hisax_if.h"
#include "hisax.h"
#include "isdnl1.h"
#include "ipacx.h"

#define DBUSY_TIMER_VALUE 80
#define TIMER3_VALUE      7000
#define MAX_DFRAME_LEN_L1 300
#define B_FIFO_SIZE       64
#define D_FIFO_SIZE       32


// ipacx interrupt mask values    
#define _MASK_IMASK     0x2E  // global mask
#define _MASKB_IMASK    0x0B
#define _MASKD_IMASK    0x03  // all on

//----------------------------------------------------------
// local function declarations
//----------------------------------------------------------
static void ph_command(struct IsdnCardState *cs, unsigned int command);
static inline void cic_int(struct IsdnCardState *cs);
static void dch_l2l1(struct PStack *st, int pr, void *arg);
static void dbusy_timer_handler(struct IsdnCardState *cs);
static void dch_empty_fifo(struct IsdnCardState *cs, int count);
static void dch_fill_fifo(struct IsdnCardState *cs);
static inline void dch_int(struct IsdnCardState *cs);
static void dch_setstack(struct PStack *st, struct IsdnCardState *cs);
static void dch_init(struct IsdnCardState *cs);
static void bch_l2l1(struct PStack *st, int pr, void *arg);
static void bch_empty_fifo(struct BCState *bcs, int count);
static void bch_fill_fifo(struct BCState *bcs);
static void bch_int(struct IsdnCardState *cs, u_char hscx);
static void bch_mode(struct BCState *bcs, int mode, int bc);
static void bch_close_state(struct BCState *bcs);
static int bch_open_state(struct IsdnCardState *cs, struct BCState *bcs);
static int bch_setstack(struct PStack *st, struct BCState *bcs);
static void bch_init(struct IsdnCardState *cs, int hscx);
static void clear_pending_ints(struct IsdnCardState *cs);

//----------------------------------------------------------
// Issue Layer 1 command to chip
//----------------------------------------------------------
static void 
ph_command(struct IsdnCardState *cs, unsigned int command)
{
	if (cs->debug &L1_DEB_ISAC)
		debugl1(cs, "ph_command (%#x) in (%#x)", command,
			cs->dc.isac.ph_state);
//###################################  
//	printk(KERN_INFO "ph_command (%#x)\n", command);
//###################################  
	cs->writeisac(cs, IPACX_CIX0, (command << 4) | 0x0E);
}

//----------------------------------------------------------
// Transceiver interrupt handler
//----------------------------------------------------------
static inline void 
cic_int(struct IsdnCardState *cs)
{
	u_char event;

	event = cs->readisac(cs, IPACX_CIR0) >> 4;
	if (cs->debug &L1_DEB_ISAC) debugl1(cs, "cic_int(event=%#x)", event);
//#########################################  
//	printk(KERN_INFO "cic_int(%x)\n", event);
//#########################################  
  cs->dc.isac.ph_state = event;
  schedule_event(cs, D_L1STATECHANGE);
}

//==========================================================
// D channel functions
//==========================================================

//----------------------------------------------------------
// Command entry point
//----------------------------------------------------------
static void
dch_l2l1(struct PStack *st, int pr, void *arg)
{
	struct IsdnCardState *cs = (struct IsdnCardState *) st->l1.hardware;
	struct sk_buff *skb = arg;
  u_char cda1_cr, cda2_cr;

	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
				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
				if (cs->debug &L1_DEB_LAPD) Logl2Frame(cs, skb, "PH_DATA", 0);
#endif
				dch_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