hil_mlc.c

来自「linux 内核源代码」· C语言 代码 · 共 1,015 行 · 第 1/2 页

	EXPECT_LAST(HIL_CMD_ELB | HIL_ERR_INT,
		    20000,	HILSEN_REPOLL,	HILSEN_DSR,	HILSEN_NEXT)
	FUNC(hilse_dec_ddi, 0,	HILSEN_HEAL,	HILSEN_NEXT,	0)

	/* 21 HILSEN_ACF */
	FUNC(hilse_init_lcv, 0,	HILSEN_NEXT,	HILSEN_DOZE,	0)

	/* 22 HILSEN_ACF2 */
	FUNC(hilse_inc_lcv, 10,	HILSEN_NEXT,	HILSEN_START,	0)
	OUT(HIL_PKT_CMD | HIL_CMD_ACF | 1)
	IN(20000,		HILSEN_NEXT,	HILSEN_DSR,	HILSEN_NEXT)

	/* 25 HILSEN_DISC0 */
	OUT_DISC(HIL_PKT_CMD | HIL_CMD_ELB)
	EXPECT_DISC(HIL_PKT_CMD | HIL_CMD_ELB | HIL_ERR_INT,
	       20000,		HILSEN_NEXT,	HILSEN_DSR,	HILSEN_DSR)

	/* Only enter here if response just received */
	/* 27 HILSEN_DISC */
	OUT_DISC(HIL_PKT_CMD | HIL_CMD_IDD)
	EXPECT_DISC(HIL_PKT_CMD | HIL_CMD_IDD | HIL_ERR_INT,
	       20000,		HILSEN_NEXT,	HILSEN_DSR,	HILSEN_START)
	FUNC(hilse_inc_ddi,  0,	HILSEN_NEXT,	HILSEN_START,	0)
	FUNC(hilse_take_idd, 0,	HILSEN_MATCH,	HILSEN_IFCACF,	HILSEN_FOLLOW)
	OUT_LAST(HIL_PKT_CMD | HIL_CMD_RSC)
	EXPECT_LAST(HIL_PKT_CMD | HIL_CMD_RSC | HIL_ERR_INT,
	       30000,		HILSEN_NEXT,	HILSEN_DSR,	HILSEN_DSR)
	FUNC(hilse_take_rsc, 0,	HILSEN_MATCH,	0,		HILSEN_FOLLOW)
	OUT_LAST(HIL_PKT_CMD | HIL_CMD_EXD)
	EXPECT_LAST(HIL_PKT_CMD | HIL_CMD_EXD | HIL_ERR_INT,
	       30000,		HILSEN_NEXT,	HILSEN_DSR,	HILSEN_DSR)
	FUNC(hilse_take_exd, 0,	HILSEN_MATCH,	0,		HILSEN_FOLLOW)
	OUT_LAST(HIL_PKT_CMD | HIL_CMD_RNM)
	EXPECT_LAST(HIL_PKT_CMD | HIL_CMD_RNM | HIL_ERR_INT,
	       30000,		HILSEN_NEXT,	HILSEN_DSR,	HILSEN_DSR)
	FUNC(hilse_take_rnm, 0, HILSEN_MATCH,	0,		0)

	/* 40 HILSEN_MATCH */
	FUNC(hilse_match, 0,	HILSEN_NEXT,	HILSEN_NEXT,	/* TODO */ 0)

	/* 41 HILSEN_OPERATE */
	OUT(HIL_PKT_CMD | HIL_CMD_POL)
	EXPECT(HIL_PKT_CMD | HIL_CMD_POL | HIL_ERR_INT,
	       20000,		HILSEN_NEXT,	HILSEN_DSR,	HILSEN_NEXT)
	FUNC(hilse_operate, 0,	HILSEN_OPERATE,	HILSEN_IFC,	HILSEN_NEXT)

	/* 44 HILSEN_PROBE */
	OUT_LAST(HIL_PKT_CMD | HIL_CMD_EPT)
	IN(10000,		HILSEN_DISC,	HILSEN_DSR,	HILSEN_NEXT)
	OUT_DISC(HIL_PKT_CMD | HIL_CMD_ELB)
	IN(10000,		HILSEN_DISC,	HILSEN_DSR,	HILSEN_NEXT)
	OUT(HIL_PKT_CMD | HIL_CMD_ACF | 1)
	IN(10000,		HILSEN_DISC0,	HILSEN_DSR,	HILSEN_NEXT)
	OUT_LAST(HIL_PKT_CMD | HIL_CMD_ELB)
	IN(10000,		HILSEN_OPERATE,	HILSEN_DSR,	HILSEN_DSR)

	/* 52 HILSEN_DSR */
	FUNC(hilse_set_ddi, -1,	HILSEN_NEXT,	0,		0)
	OUT(HIL_PKT_CMD | HIL_CMD_DSR)
	IN(20000,		HILSEN_DHR,	HILSEN_DHR,	HILSEN_IFC)

	/* 55 HILSEN_REPOLL */
	OUT(HIL_PKT_CMD | HIL_CMD_RPL)
	EXPECT(HIL_PKT_CMD | HIL_CMD_RPL | HIL_ERR_INT,
	       20000,		HILSEN_NEXT,	HILSEN_DSR,	HILSEN_NEXT)
	FUNC(hilse_operate, 1,	HILSEN_OPERATE,	HILSEN_IFC,	HILSEN_PROBE)

	/* 58 HILSEN_IFCACF */
	OUT(HIL_PKT_CMD | HIL_CMD_IFC)
	EXPECT(HIL_PKT_CMD | HIL_CMD_IFC | HIL_ERR_INT,
	       20000,		HILSEN_ACF2,	HILSEN_DHR2,	HILSEN_HEAL)

	/* 60 HILSEN_END */
};

static inline void hilse_setup_input(hil_mlc *mlc, const struct hilse_node *node)
{

	switch (node->act) {
	case HILSE_EXPECT_DISC:
		mlc->imatch = node->object.packet;
		mlc->imatch |= ((mlc->ddi + 2) << HIL_PKT_ADDR_SHIFT);
		break;
	case HILSE_EXPECT_LAST:
		mlc->imatch = node->object.packet;
		mlc->imatch |= ((mlc->ddi + 1) << HIL_PKT_ADDR_SHIFT);
		break;
	case HILSE_EXPECT:
		mlc->imatch = node->object.packet;
		break;
	case HILSE_IN:
		mlc->imatch = 0;
		break;
	default:
		BUG();
	}
	mlc->istarted = 1;
	mlc->intimeout = node->arg;
	do_gettimeofday(&(mlc->instart));
	mlc->icount = 15;
	memset(mlc->ipacket, 0, 16 * sizeof(hil_packet));
	BUG_ON(down_trylock(&mlc->isem));
}

#ifdef HIL_MLC_DEBUG
static int doze;
static int seidx; /* For debug */
#endif

static int hilse_donode(hil_mlc *mlc)
{
	const struct hilse_node *node;
	int nextidx = 0;
	int sched_long = 0;
	unsigned long flags;

#ifdef HIL_MLC_DEBUG
	if (mlc->seidx && mlc->seidx != seidx &&
	    mlc->seidx != 41 && mlc->seidx != 42 && mlc->seidx != 43) {
		printk(KERN_DEBUG PREFIX "z%i \n {%i}", doze, mlc->seidx);
		doze = 0;
	}

	seidx = mlc->seidx;
#endif
	node = hil_mlc_se + mlc->seidx;

	switch (node->act) {
		int rc;
		hil_packet pack;

	case HILSE_FUNC:
		BUG_ON(node->object.func == NULL);
		rc = node->object.func(mlc, node->arg);
		nextidx = (rc > 0) ? node->ugly :
			((rc < 0) ? node->bad : node->good);
		if (nextidx == HILSEN_FOLLOW)
			nextidx = rc;
		break;

	case HILSE_EXPECT_LAST:
	case HILSE_EXPECT_DISC:
	case HILSE_EXPECT:
	case HILSE_IN:
		/* Already set up from previous HILSE_OUT_* */
		write_lock_irqsave(&mlc->lock, flags);
		rc = mlc->in(mlc, node->arg);
		if (rc == 2)  {
			nextidx = HILSEN_DOZE;
			sched_long = 1;
			write_unlock_irqrestore(&mlc->lock, flags);
			break;
		}
		if (rc == 1)
			nextidx = node->ugly;
		else if (rc == 0)
			nextidx = node->good;
		else
			nextidx = node->bad;
		mlc->istarted = 0;
		write_unlock_irqrestore(&mlc->lock, flags);
		break;

	case HILSE_OUT_LAST:
		write_lock_irqsave(&mlc->lock, flags);
		pack = node->object.packet;
		pack |= ((mlc->ddi + 1) << HIL_PKT_ADDR_SHIFT);
		goto out;

	case HILSE_OUT_DISC:
		write_lock_irqsave(&mlc->lock, flags);
		pack = node->object.packet;
		pack |= ((mlc->ddi + 2) << HIL_PKT_ADDR_SHIFT);
		goto out;

	case HILSE_OUT:
		write_lock_irqsave(&mlc->lock, flags);
		pack = node->object.packet;
	out:
		if (mlc->istarted)
			goto out2;
		/* Prepare to receive input */
		if ((node + 1)->act & HILSE_IN)
			hilse_setup_input(mlc, node + 1);

	out2:
		write_unlock_irqrestore(&mlc->lock, flags);

		if (down_trylock(&mlc->osem)) {
			nextidx = HILSEN_DOZE;
			break;
		}
		up(&mlc->osem);

		write_lock_irqsave(&mlc->lock, flags);
		if (!mlc->ostarted) {
			mlc->ostarted = 1;
			mlc->opacket = pack;
			mlc->out(mlc);
			nextidx = HILSEN_DOZE;
			write_unlock_irqrestore(&mlc->lock, flags);
			break;
		}
		mlc->ostarted = 0;
		do_gettimeofday(&(mlc->instart));
		write_unlock_irqrestore(&mlc->lock, flags);
		nextidx = HILSEN_NEXT;
		break;

	case HILSE_CTS:
		write_lock_irqsave(&mlc->lock, flags);
		nextidx = mlc->cts(mlc) ? node->bad : node->good;
		write_unlock_irqrestore(&mlc->lock, flags);
		break;

	default:
		BUG();
	}

#ifdef HIL_MLC_DEBUG
	if (nextidx == HILSEN_DOZE)
		doze++;
#endif

	while (nextidx & HILSEN_SCHED) {
		struct timeval tv;

		if (!sched_long)
			goto sched;

		do_gettimeofday(&tv);
		tv.tv_usec += USEC_PER_SEC * (tv.tv_sec - mlc->instart.tv_sec);
		tv.tv_usec -= mlc->instart.tv_usec;
		if (tv.tv_usec >= mlc->intimeout) goto sched;
		tv.tv_usec = (mlc->intimeout - tv.tv_usec) * HZ / USEC_PER_SEC;
		if (!tv.tv_usec) goto sched;
		mod_timer(&hil_mlcs_kicker, jiffies + tv.tv_usec);
		break;
	sched:
		tasklet_schedule(&hil_mlcs_tasklet);
		break;
	}

	if (nextidx & HILSEN_DOWN)
		mlc->seidx += nextidx & HILSEN_MASK;
	else if (nextidx & HILSEN_UP)
		mlc->seidx -= nextidx & HILSEN_MASK;
	else
		mlc->seidx = nextidx & HILSEN_MASK;

	if (nextidx & HILSEN_BREAK)
		return 1;

	return 0;
}

/******************** tasklet context functions **************************/
static void hil_mlcs_process(unsigned long unused)
{
	struct list_head *tmp;

	read_lock(&hil_mlcs_lock);
	list_for_each(tmp, &hil_mlcs) {
		struct hil_mlc *mlc = list_entry(tmp, hil_mlc, list);
		while (hilse_donode(mlc) == 0) {
#ifdef HIL_MLC_DEBUG
			if (mlc->seidx != 41 &&
			    mlc->seidx != 42 &&
			    mlc->seidx != 43)
				printk(KERN_DEBUG PREFIX " + ");
#endif
		}
	}
	read_unlock(&hil_mlcs_lock);
}

/************************* Keepalive timer task *********************/

void hil_mlcs_timer(unsigned long data)
{
	hil_mlcs_probe = 1;
	tasklet_schedule(&hil_mlcs_tasklet);
	/* Re-insert the periodic task. */
	if (!timer_pending(&hil_mlcs_kicker))
		mod_timer(&hil_mlcs_kicker, jiffies + HZ);
}

/******************** user/kernel context functions **********************/

static int hil_mlc_serio_write(struct serio *serio, unsigned char c)
{
	struct hil_mlc_serio_map *map;
	struct hil_mlc *mlc;
	struct serio_driver *drv;
	uint8_t *idx, *last;

	map = serio->port_data;
	BUG_ON(map == NULL);

	mlc = map->mlc;
	BUG_ON(mlc == NULL);

	mlc->serio_opacket[map->didx] |=
		((hil_packet)c) << (8 * (3 - mlc->serio_oidx[map->didx]));

	if (mlc->serio_oidx[map->didx] >= 3) {
		/* for now only commands */
		if (!(mlc->serio_opacket[map->didx] & HIL_PKT_CMD))
			return -EIO;
		switch (mlc->serio_opacket[map->didx] & HIL_PKT_DATA_MASK) {
		case HIL_CMD_IDD:
			idx = mlc->di[map->didx].idd;
			goto emu;
		case HIL_CMD_RSC:
			idx = mlc->di[map->didx].rsc;
			goto emu;
		case HIL_CMD_EXD:
			idx = mlc->di[map->didx].exd;
			goto emu;
		case HIL_CMD_RNM:
			idx = mlc->di[map->didx].rnm;
			goto emu;
		default:
			break;
		}
		mlc->serio_oidx[map->didx] = 0;
		mlc->serio_opacket[map->didx] = 0;
	}

	mlc->serio_oidx[map->didx]++;
	return -EIO;
 emu:
	drv = serio->drv;
	BUG_ON(drv == NULL);

	last = idx + 15;
	while ((last != idx) && (*last == 0))
		last--;

	while (idx != last) {
		drv->interrupt(serio, 0, 0);
		drv->interrupt(serio, HIL_ERR_INT >> 16, 0);
		drv->interrupt(serio, 0, 0);
		drv->interrupt(serio, *idx, 0);
		idx++;
	}
	drv->interrupt(serio, 0, 0);
	drv->interrupt(serio, HIL_ERR_INT >> 16, 0);
	drv->interrupt(serio, HIL_PKT_CMD >> 8, 0);
	drv->interrupt(serio, *idx, 0);

	mlc->serio_oidx[map->didx] = 0;
	mlc->serio_opacket[map->didx] = 0;

	return 0;
}

static int hil_mlc_serio_open(struct serio *serio)
{
	struct hil_mlc_serio_map *map;
	struct hil_mlc *mlc;

	if (serio_get_drvdata(serio) != NULL)
		return -EBUSY;

	map = serio->port_data;
	BUG_ON(map == NULL);

	mlc = map->mlc;
	BUG_ON(mlc == NULL);

	return 0;
}

static void hil_mlc_serio_close(struct serio *serio)
{
	struct hil_mlc_serio_map *map;
	struct hil_mlc *mlc;

	map = serio->port_data;
	BUG_ON(map == NULL);

	mlc = map->mlc;
	BUG_ON(mlc == NULL);

	serio_set_drvdata(serio, NULL);
	serio->drv = NULL;
	/* TODO wake up interruptable */
}

static const struct serio_device_id hil_mlc_serio_id = {
	.type = SERIO_HIL_MLC,
	.proto = SERIO_HIL,
	.extra = SERIO_ANY,
	.id = SERIO_ANY,
};

int hil_mlc_register(hil_mlc *mlc)
{
	int i;
	unsigned long flags;

	BUG_ON(mlc == NULL);

	mlc->istarted = 0;
	mlc->ostarted = 0;

	rwlock_init(&mlc->lock);
	init_MUTEX(&mlc->osem);

	init_MUTEX(&mlc->isem);
	mlc->icount = -1;
	mlc->imatch = 0;

	mlc->opercnt = 0;

	init_MUTEX_LOCKED(&(mlc->csem));

	hil_mlc_clear_di_scratch(mlc);
	hil_mlc_clear_di_map(mlc, 0);
	for (i = 0; i < HIL_MLC_DEVMEM; i++) {
		struct serio *mlc_serio;
		hil_mlc_copy_di_scratch(mlc, i);
		mlc_serio = kzalloc(sizeof(*mlc_serio), GFP_KERNEL);
		mlc->serio[i] = mlc_serio;
		snprintf(mlc_serio->name, sizeof(mlc_serio->name)-1, "HIL_SERIO%d", i);
		snprintf(mlc_serio->phys, sizeof(mlc_serio->phys)-1, "HIL%d", i);
		mlc_serio->id			= hil_mlc_serio_id;
		mlc_serio->write		= hil_mlc_serio_write;
		mlc_serio->open			= hil_mlc_serio_open;
		mlc_serio->close		= hil_mlc_serio_close;
		mlc_serio->port_data		= &(mlc->serio_map[i]);
		mlc->serio_map[i].mlc		= mlc;
		mlc->serio_map[i].didx		= i;
		mlc->serio_map[i].di_revmap	= -1;
		mlc->serio_opacket[i]		= 0;
		mlc->serio_oidx[i]		= 0;
		serio_register_port(mlc_serio);
	}

	mlc->tasklet = &hil_mlcs_tasklet;

	write_lock_irqsave(&hil_mlcs_lock, flags);
	list_add_tail(&mlc->list, &hil_mlcs);
	mlc->seidx = HILSEN_START;
	write_unlock_irqrestore(&hil_mlcs_lock, flags);

	tasklet_schedule(&hil_mlcs_tasklet);
	return 0;
}

int hil_mlc_unregister(hil_mlc *mlc)
{
	struct list_head *tmp;
	unsigned long flags;
	int i;

	BUG_ON(mlc == NULL);

	write_lock_irqsave(&hil_mlcs_lock, flags);
	list_for_each(tmp, &hil_mlcs)
		if (list_entry(tmp, hil_mlc, list) == mlc)
			goto found;

	/* not found in list */
	write_unlock_irqrestore(&hil_mlcs_lock, flags);
	tasklet_schedule(&hil_mlcs_tasklet);
	return -ENODEV;

 found:
	list_del(tmp);
	write_unlock_irqrestore(&hil_mlcs_lock, flags);

	for (i = 0; i < HIL_MLC_DEVMEM; i++) {
		serio_unregister_port(mlc->serio[i]);
		mlc->serio[i] = NULL;
	}

	tasklet_schedule(&hil_mlcs_tasklet);
	return 0;
}

/**************************** Module interface *************************/

static int __init hil_mlc_init(void)
{
	init_timer(&hil_mlcs_kicker);
	hil_mlcs_kicker.expires = jiffies + HZ;
	hil_mlcs_kicker.function = &hil_mlcs_timer;
	add_timer(&hil_mlcs_kicker);

	tasklet_enable(&hil_mlcs_tasklet);

	return 0;
}

static void __exit hil_mlc_exit(void)
{
	del_timer(&hil_mlcs_kicker);

	tasklet_disable(&hil_mlcs_tasklet);
	tasklet_kill(&hil_mlcs_tasklet);
}

module_init(hil_mlc_init);
module_exit(hil_mlc_exit);