patch-2.3.42 linux/drivers/ap1000/plc.c

• Lines: 394
• Date: Wed Dec 31 16:00:00 1969
• Orig file: v2.3.41/linux/drivers/ap1000/plc.c
• Orig date: Sun Jan 26 02:07:10 1997

diff -u --recursive --new-file v2.3.41/linux/drivers/ap1000/plc.c linux/drivers/ap1000/plc.c
@@ -1,393 +0,0 @@
-  /*
-   * Copyright 1996 The Australian National University.
-   * Copyright 1996 Fujitsu Laboratories Limited
-   * 
-   * This software may be distributed under the terms of the Gnu
-   * Public License version 2 or later
-  */
-/*
- * Routines for controlling the Am79c864 physical layer controller.
- *
- * This chip implements some parts of the FDDI SMT standard
- * (PCM: physical connection management, LEM: link error monitor, etc.)
- * as well as the FDDI PHY standard.
- */
-#include <linux/types.h>
-#include <linux/string.h>
-#include <linux/kernel.h>
-#include "apfddi.h"
-#include "smt-types.h"
-#include "am79c864.h"
-#include "plc.h"
-#include "apfddi-reg.h"
-
-typedef enum {
-    off,
-    signalling,
-    doing_lct,
-    joining,
-    active
-} PlcPhase;
-    
-struct plc_state {
-    LoopbackType	loopback;
-    char		t_val[16];
-    char		r_val[16];
-    int			n;
-    PortType		peer_type;
-    PlcPhase		phase;
-};
-
-struct plc_info *this_plc_info;
-struct plc_state this_plc_state;
-
-void plc_init(struct plc_info *pip)
-{
-    int class, x;
-    struct plc_state *psp = &this_plc_state;
-
-    this_plc_info = pip;
-
-    /* first turn it off, clear registers */
-    class = pip->port_type == pt_s? CB_CLASS_S: 0;
-    plc->ctrl_b = CB_PC_STOP + class;
-    plc->intr_mask = IE_NP_ERROR;
-    x = plc->intr_event;	/* these register clear when read */
-    x = plc->viol_sym_ct;
-    x = plc->min_idle_ct;
-    x = plc->link_err_ct;
-
-    /* initialize registers */
-    plc->ctrl_a = 0;
-    plc->ctrl_b = class;
-    plc->c_min = pip->c_min >> 8;
-    plc->tl_min = pip->tl_min >> 8;
-    plc->tb_min = pip->tb_min >> 8;
-    plc->t_out = pip->t_out >> 8;
-    plc->t_scrub = pip->t_scrub >> 8;
-    plc->ns_max = pip->ns_max >> 2;
-
-    psp->phase = off;
-}
-
-int
-plc_inited(struct plc_info *pip)
-{
-    int class, x;
-    struct plc_state *psp = &this_plc_state;
-
-    class = pip->port_type == pt_s? CB_CLASS_S: 0;
-    if ((plc->ctrl_a & (CA_LOOPBACK|CA_FOT_OFF|CA_EB_LOOP|CA_LM_LOOP)) != 0)
-	return 1;
-    if ((plc->ctrl_b & (CB_CONFIG_CTRL|CB_CLASS_S|CB_PC_MAINT)) != class)
-	return 2;
-    if (plc->status_a & SA_SIG_DETECT)
-	return 3;
-    if ((plc->status_b & (SB_PCI_STATE|SB_PCM_STATE))
-	 != (SB_PCI_STATE_INSERTED|SB_PCM_STATE_ACTIVE))
-	return 4;
-
-    /* all seems OK, reset the timers and counters just to be sure */
-    plc->intr_mask = IE_NP_ERROR;
-    x = plc->intr_event;	/* these register clear when read */
-    x = plc->viol_sym_ct;
-    x = plc->min_idle_ct;
-    x = plc->link_err_ct;
-
-    plc->c_min = pip->c_min >> 8;
-    plc->tl_min = pip->tl_min >> 8;
-    plc->tb_min = pip->tb_min >> 8;
-    plc->t_out = pip->t_out >> 8;
-    plc->t_scrub = pip->t_scrub >> 8;
-    plc->ns_max = pip->ns_max >> 2;
-
-    psp->phase = active;
-    /* XXX should initialize other fields of this_plc_state */
-
-    return 0;
-}
-
-void plc_sleep(void)
-{
-}
-
-void pc_start(LoopbackType loopback)
-{
-    int x;
-    struct plc_info *pip = this_plc_info;
-    struct plc_state *psp = &this_plc_state;
-
-    /* make sure it's off */
-    plc->ctrl_b &= ~CB_PCM_CTRL;
-    plc->ctrl_b |= CB_PC_STOP;
-
-    /* set up loopback required */
-    psp->loopback = loopback;
-    x = 0;
-    switch (loopback) {
-    case loop_plc_lm:
-	x = CA_LM_LOOP;
-	break;
-    case loop_plc_eb:
-	x = CA_EB_LOOP;
-	break;
-    case loop_pdx:
-	x = CA_LOOPBACK;
-	break;
-    default:
-	x = 0;
-    }
-    plc->ctrl_a = x;
-
-    /* set up bits to be exchanged */
-    psp->t_val[0] = 0;
-    psp->t_val[1] = ((int) pip->port_type >> 1) & 1;
-    psp->t_val[2] = (int) pip->port_type & 1;
-    psp->t_val[4] = 0;		/* XXX assume we want short LCT */
-    psp->t_val[5] = 0;
-    psp->t_val[6] = 0;		/* XXX too lazy to fire up my MAC for LCT */
-    psp->t_val[8] = 0;		/* XXX don't wanna local loop */
-    psp->t_val[9] = 1;		/* gotta MAC on port output */
-
-    pc_restart();
-}
-
-void pc_restart(void)
-{
-    struct plc_state *psp = &this_plc_state;
-
-    if (psp->phase != off)
-	printk("restarting pcm\n");
-    if (psp->phase == active)
-	set_cf_join(0);		/* we're down :-( */
-
-    psp->n = 0;
-    plc->vec_length = 3 - 1;
-    plc->xmit_vector = psp->t_val[0] + (psp->t_val[1] << 1)
-	+ (psp->t_val[2] << 2);
-
-    plc->intr_mask = IE_NP_ERROR | IE_PCM_BREAK | IE_PCM_CODE;
-    plc->ctrl_b &= ~CB_PCM_CTRL;
-    plc->ctrl_b |= CB_PC_START;	/* light blue paper and stand clear */
-
-    psp->phase = signalling;
-}
-
-void pc_stop(void)
-{
-    struct plc_state *psp = &this_plc_state;
-
-    if (psp->phase == active)
-	set_cf_join(0);
-    plc->ctrl_b &= ~CB_PCM_CTRL;
-    plc->ctrl_b |= CB_PC_STOP;
-    plc->intr_mask = IE_NP_ERROR;
-    psp->phase = off;
-}
-
-void plc_poll(void)
-{
-    struct plc_state *psp = &this_plc_state;
-    int events, i;
-
-    if ((*csr0 & CS0_PHY_IRQ) == 0)
-	return;
-    events = plc->intr_event & plc->intr_mask;
-    if (events & IE_NP_ERROR) {
-	printk("plc: NP error!\n");
-    }
-    if (events & IE_PCM_BREAK) {
-	i = plc->status_b & SB_BREAK_REASON;
-	if (i > SB_BREAK_REASON_START) {
-	    if (psp->phase == signalling || psp->phase == doing_lct)
-		pcm_dump_rtcodes();
-	    printk("pcm: break reason %d\n", i);
-	    if (psp->phase != off)
-		pc_restart();
-	    /* XXX need to check for trace? */
-	}
-    }
-    if (events & IE_PCM_CODE) {
-	if (psp->phase == signalling)
-	    pcm_pseudo_code();
-	else if (psp->phase == doing_lct)
-	    pcm_lct_done();
-	else
-	    printk("XXX pcm_code interrupt in phase %d?\n", psp->phase);
-    }
-    if (events & IE_PCM_ENABLED) {
-	if (psp->phase == joining)
-	    pcm_enabled();
-	else
-	    printk("XXX pcm_enabled interrupt in phase %d?\n", psp->phase);
-    }
-    if (events & IE_TRACE_PROP) {
-	if (psp->phase == active)
-	    pcm_trace_prop();
-	else
-	    printk("XXX trace_prop interrupt in phase %d\n", psp->phase);
-    }
-}
-
-void pcm_pseudo_code(void)
-{
-    struct plc_info *pip = this_plc_info;
-    struct plc_state *psp = &this_plc_state;
-    int i, nb, lct, hislct;
-
-    /* unpack the bits from the peer */
-    nb = plc->vec_length + 1;
-    i = plc->rcv_vector;
-    do {
-	psp->r_val[psp->n++] = i & 1;
-	i >>= 1;
-    } while (--nb > 0);
-
-    /* send some more, do LCT, whatever */
-    switch (psp->n) {
-    case 3:
-	/*
-	 * Got escape flag, port type; send compatibility,
-	 * LCT duration, MAC for LCT flag.
-	 */
-	if (psp->r_val[0]) {
-	    /* help! what do I do now? */
-	    pcm_dump_rtcodes();
-	    pc_restart();
-	    break;
-	}
-	psp->peer_type = (PortType) ((psp->r_val[1] << 1) + psp->r_val[2]);
-	/* XXX we're type S, we talk to anybody */
-	psp->t_val[3] = 1;
-
-	plc->vec_length = 4 - 1;
-	plc->xmit_vector = psp->t_val[3] + (psp->t_val[4] << 1)
-	    + (psp->t_val[5] << 2) + (psp->t_val[6] << 3);
-	break;
-
-    case 7:
-	/*
-	 * Got compatibility, LCT duration, MAC for LCT flag;
-	 * time to do the LCT.
-	 */
-	lct = (psp->t_val[4] << 1) + psp->t_val[5];
-	hislct = (psp->r_val[4] << 1) + psp->r_val[5];
-	if (hislct > lct)
-	    lct = hislct;
-
-	/* set LCT duration */
-	switch (lct) {
-	case 0:
-	    plc->lc_length = pip->lc_short >> 8;
-	    plc->ctrl_b &= ~CB_LONG_LCT;
-	    break;
-	case 1:
-	    plc->lc_length = pip->lc_medium >> 8;
-	    plc->ctrl_b &= ~CB_LONG_LCT;
-	    break;
-	case 2:
-	    plc->ctrl_b |= CB_LONG_LCT;
-	    /* XXX set up a timeout for pip->lc_long */
-	    break;
-	case 3:
-	    plc->ctrl_b |= CB_LONG_LCT;
-	    /* XXX set up a timeout for pip->lc_extended */
-	    break;
-	}
-
-	/* start the LCT */
-	i = plc->link_err_ct;	/* clear the register */
-	plc->ctrl_b &= ~CB_PC_LCT;
-	/* XXX assume we're not using the MAC for LCT;
-	   if he's got a MAC, loop his stuff back, otherwise send idle. */
-	if (psp->r_val[6])
-	    plc->ctrl_b |= CB_PC_LCT_LOOP;
-	else
-	    plc->ctrl_b |= CB_PC_LCT_IDLE;
-	psp->phase = doing_lct;
-	break;
-
-    case 8:
-	/*
-	 * Got LCT result, send MAC for local loop and MAC on port
-	 * output flags.
-	 */
-	if (psp->t_val[7] || psp->r_val[7]) {
-	    printk("LCT failed, restarting.\n");
-	    /* LCT failed - do at least a medium length test next time. */
-	    if (psp->t_val[4] == 0 && psp->t_val[5] == 0)
-		psp->t_val[5] = 1;
-	    pcm_dump_rtcodes();
-	    pc_restart();
-	    break;
-	}
-	plc->vec_length = 2 - 1;
-	plc->xmit_vector = psp->t_val[8] + (psp->t_val[9] << 1);
-	break;
-
-    case 10:
-	/*
-	 * Got MAC for local loop and MAC on port output flags.
-	 * Let's join.
-	 */
-	plc->intr_mask = IE_NP_ERROR | IE_PCM_BREAK | IE_PCM_ENABLED;
-	plc->ctrl_b |= CB_PC_JOIN;
-	psp->phase = joining;
-	/* printk("pcm: joining\n"); */
-	break;
-
-    default:
-	printk("pcm_pseudo_code bug: n = %d\n", psp->n);
-    }
-}
-
-void pcm_lct_done(void)
-{
-    struct plc_state *psp = &this_plc_state;
-    int i;
-
-    i = plc->link_err_ct;
-    psp->t_val[7] = i > 0;
-    printk("pcm: lct %s (%d errors)\n", psp->t_val[7]? "failed": "passed", i);
-    plc->ctrl_b &= ~(CB_PC_LCT | CB_LONG_LCT);
-    plc->vec_length = 1 - 1;
-    plc->xmit_vector = psp->t_val[7];
-    psp->phase = signalling;
-}
-
-void pcm_dump_rtcodes(void)
-{
-    struct plc_state *psp = &this_plc_state;
-    int i;
-
-    if (psp->n > 0) {
-	printk("pcm signalling interrupted after %d bits:\nt_val:", psp->n);
-	for (i = 0; i < psp->n; ++i)
-	    printk(" %d", psp->t_val[i]);
-	printk("\nr_val:");
-	for (i = 0; i < psp->n; ++i)
-	    printk(" %d", psp->r_val[i]);
-	printk("\n");
-    }
-}
-
-void pcm_enabled(void)
-{
-    struct plc_state *psp = &this_plc_state;
-    int i;
-
-    printk("pcm: enabled\n");
-    psp->phase = active;
-    i = plc->link_err_ct;	/* clear the register */
-    /* XXX should set up LEM here */
-    /* XXX do we want to count violation symbols, minimum idle gaps,
-       or elasticity buffer errors? */
-    plc->intr_mask = IE_NP_ERROR | IE_PCM_BREAK | IE_TRACE_PROP;
-    set_cf_join(1);		/* we're up :-) */
-}
-
-void pcm_trace_prop(void)
-{
-    /* XXX help! what do I do now? */
-    pc_stop();
-}