t1isa.c

讲述linux的初始化过程

			printk(KERN_ERR "%s: card reseted ?\n", card->name);
			return;
		default:
			printk(KERN_ERR "%s: b1_interrupt: 0x%x ???\n",
					card->name, b1cmd);
			return;
		}
	}
}

/* ------------------------------------------------------------- */

static void t1isa_interrupt(int interrupt, void *devptr, struct pt_regs *regs)
{
	avmcard *card;

	card = (avmcard *) devptr;

	if (!card) {
		printk(KERN_WARNING "t1isa: interrupt: wrong device\n");
		return;
	}
	if (card->interrupt) {
		printk(KERN_ERR "%s: reentering interrupt hander.\n",
				 card->name);
		return;
	}

	card->interrupt = 1;

	t1_handle_interrupt(card);

	card->interrupt = 0;
}
/* ------------------------------------------------------------- */

static int t1isa_load_firmware(struct capi_ctr *ctrl, capiloaddata *data)
{
	avmctrl_info *cinfo = (avmctrl_info *)(ctrl->driverdata);
	avmcard *card = cinfo->card;
	unsigned int port = card->port;
	unsigned long flags;
	int retval;

	t1_disable_irq(port);
	b1_reset(port);

	if ((retval = b1_load_t4file(card, &data->firmware))) {
		b1_reset(port);
		printk(KERN_ERR "%s: failed to load t4file!!\n",
					card->name);
		return retval;
	}

	if (data->configuration.len > 0 && data->configuration.data) {
		if ((retval = b1_load_config(card, &data->configuration))) {
			b1_reset(port);
			printk(KERN_ERR "%s: failed to load config!!\n",
					card->name);
			return retval;
		}
	}

	if (!b1_loaded(card)) {
		printk(KERN_ERR "%s: failed to load t4file.\n", card->name);
		return -EIO;
	}

	save_flags(flags);
	cli();
	b1_setinterrupt(port, card->irq, card->cardtype);
	b1_put_byte(port, SEND_INIT);
	b1_put_word(port, AVM_NAPPS);
	b1_put_word(port, AVM_NCCI_PER_CHANNEL*30);
	b1_put_word(port, ctrl->cnr - 1);
	restore_flags(flags);

	return 0;
}

void t1isa_reset_ctr(struct capi_ctr *ctrl)
{
	avmctrl_info *cinfo = (avmctrl_info *)(ctrl->driverdata);
	avmcard *card = cinfo->card;
	unsigned int port = card->port;

	t1_disable_irq(port);
	b1_reset(port);
	b1_reset(port);

	memset(cinfo->version, 0, sizeof(cinfo->version));
	ctrl->reseted(ctrl);
}

static void t1isa_remove_ctr(struct capi_ctr *ctrl)
{
	avmctrl_info *cinfo = (avmctrl_info *)(ctrl->driverdata);
	avmcard *card = cinfo->card;
	unsigned int port = card->port;

	t1_disable_irq(port);
	b1_reset(port);
	b1_reset(port);
	t1_reset(port);

	di->detach_ctr(ctrl);
	free_irq(card->irq, card);
	release_region(card->port, AVMB1_PORTLEN);
	kfree(card->ctrlinfo);
	kfree(card);

	MOD_DEC_USE_COUNT;
}

/* ------------------------------------------------------------- */

static int t1isa_add_card(struct capi_driver *driver, struct capicardparams *p)
{
	struct capi_ctr *ctrl;
	avmctrl_info *cinfo;
	avmcard *card;
	int retval;

	MOD_INC_USE_COUNT;

	card = (avmcard *) kmalloc(sizeof(avmcard), GFP_ATOMIC);

	if (!card) {
		printk(KERN_WARNING "%s: no memory.\n", driver->name);
	        MOD_DEC_USE_COUNT;
		return -ENOMEM;
	}
	memset(card, 0, sizeof(avmcard));
        cinfo = (avmctrl_info *) kmalloc(sizeof(avmctrl_info), GFP_ATOMIC);
	if (!cinfo) {
		printk(KERN_WARNING "%s: no memory.\n", driver->name);
		kfree(card);
	        MOD_DEC_USE_COUNT;
		return -ENOMEM;
	}
	memset(cinfo, 0, sizeof(avmctrl_info));
	card->ctrlinfo = cinfo;
	cinfo->card = card;
	sprintf(card->name, "t1isa-%x", p->port);
	card->port = p->port;
	card->irq = p->irq;
	card->cardtype = avm_t1isa;
	card->cardnr = p->cardnr;

	if (!(((card->port & 0x7) == 0) && ((card->port & 0x30) != 0x30))) {
		printk(KERN_WARNING "%s: illegal port 0x%x.\n",
				driver->name, card->port);
	        kfree(card->ctrlinfo);
		kfree(card);
	        MOD_DEC_USE_COUNT;
		return -EINVAL;
        }

	if (check_region(card->port, AVMB1_PORTLEN)) {
		printk(KERN_WARNING
		       "%s: ports 0x%03x-0x%03x in use.\n",
		       driver->name, card->port, card->port + AVMB1_PORTLEN);
	        kfree(card->ctrlinfo);
		kfree(card);
	        MOD_DEC_USE_COUNT;
		return -EBUSY;
	}
	if (hema_irq_table[card->irq & 0xf] == 0) {
		printk(KERN_WARNING "%s: irq %d not valid.\n",
				driver->name, card->irq);
	        kfree(card->ctrlinfo);
		kfree(card);
	        MOD_DEC_USE_COUNT;
		return -EINVAL;
	}
	for (ctrl = driver->controller; ctrl; ctrl = ctrl->next) {
	        avmcard *cardp = ((avmctrl_info *)(ctrl->driverdata))->card;
		if (cardp->cardnr == card->cardnr) {
			printk(KERN_WARNING "%s: card with number %d already installed at 0x%x.\n",
					driver->name, card->cardnr, cardp->port);
	                kfree(card->ctrlinfo);
			kfree(card);
	        	MOD_DEC_USE_COUNT;
			return -EBUSY;
		}
	}
        if ((retval = t1_detectandinit(card->port, card->irq, card->cardnr)) != 0) {
		printk(KERN_NOTICE "%s: NO card at 0x%x (%d)\n",
					driver->name, card->port, retval);
	        kfree(card->ctrlinfo);
		kfree(card);
		MOD_DEC_USE_COUNT;
		return -EIO;
	}
	t1_disable_irq(card->port);
	b1_reset(card->port);

	request_region(p->port, AVMB1_PORTLEN, card->name);

	retval = request_irq(card->irq, t1isa_interrupt, 0, card->name, card);
	if (retval) {
		printk(KERN_ERR "%s: unable to get IRQ %d.\n",
				driver->name, card->irq);
		release_region(card->port, AVMB1_PORTLEN);
	        kfree(card->ctrlinfo);
		kfree(card);
		MOD_DEC_USE_COUNT;
		return -EBUSY;
	}

	cinfo->capi_ctrl = di->attach_ctr(driver, card->name, cinfo);
	if (!cinfo->capi_ctrl) {
		printk(KERN_ERR "%s: attach controller failed.\n",
				driver->name);
		free_irq(card->irq, card);
		release_region(card->port, AVMB1_PORTLEN);
	        kfree(card->ctrlinfo);
		kfree(card);
		MOD_DEC_USE_COUNT;
		return -EBUSY;
	}

	printk(KERN_INFO
		"%s: AVM T1 ISA at i/o %#x, irq %d, card %d\n",
		driver->name, card->port, card->irq, card->cardnr);

	return 0;
}

static void t1isa_send_message(struct capi_ctr *ctrl, struct sk_buff *skb)
{
	avmctrl_info *cinfo = (avmctrl_info *)(ctrl->driverdata);
	avmcard *card = cinfo->card;
	unsigned int port = card->port;
	unsigned long flags;
	__u16 len = CAPIMSG_LEN(skb->data);
	__u8 cmd = CAPIMSG_COMMAND(skb->data);
	__u8 subcmd = CAPIMSG_SUBCOMMAND(skb->data);

	save_flags(flags);
	cli();
	if (CAPICMD(cmd, subcmd) == CAPI_DATA_B3_REQ) {
		__u16 dlen = CAPIMSG_DATALEN(skb->data);
		b1_put_byte(port, SEND_DATA_B3_REQ);
		t1_put_slice(port, skb->data, len);
		t1_put_slice(port, skb->data + len, dlen);
	} else {
		b1_put_byte(port, SEND_MESSAGE);
		t1_put_slice(port, skb->data, len);
	}
	restore_flags(flags);
	dev_kfree_skb(skb);
}
/* ------------------------------------------------------------- */

static char *t1isa_procinfo(struct capi_ctr *ctrl)
{
	avmctrl_info *cinfo = (avmctrl_info *)(ctrl->driverdata);

	if (!cinfo)
		return "";
	sprintf(cinfo->infobuf, "%s %s 0x%x %d %d",
		cinfo->cardname[0] ? cinfo->cardname : "-",
		cinfo->version[VER_DRIVER] ? cinfo->version[VER_DRIVER] : "-",
		cinfo->card ? cinfo->card->port : 0x0,
		cinfo->card ? cinfo->card->irq : 0,
		cinfo->card ? cinfo->card->cardnr : 0
		);
	return cinfo->infobuf;
}


/* ------------------------------------------------------------- */

static struct capi_driver t1isa_driver = {
    name: "t1isa",
    revision: "0.0",
    load_firmware: t1isa_load_firmware,
    reset_ctr: t1isa_reset_ctr,
    remove_ctr: t1isa_remove_ctr,
    register_appl: b1_register_appl,
    release_appl: b1_release_appl,
    send_message: t1isa_send_message,

    procinfo: t1isa_procinfo,
    ctr_read_proc: b1ctl_read_proc,
    driver_read_proc: 0,	/* use standard driver_read_proc */

    add_card: t1isa_add_card,
};

static int __init t1isa_init(void)
{
	struct capi_driver *driver = &t1isa_driver;
	char *p;
	int retval = 0;

	MOD_INC_USE_COUNT;

	if ((p = strchr(revision, ':'))) {
		strncpy(driver->revision, p + 1, sizeof(driver->revision));
		p = strchr(driver->revision, '$');
		*p = 0;
	}

	printk(KERN_INFO "%s: revision %s\n", driver->name, driver->revision);

        di = attach_capi_driver(driver);

	if (!di) {
		printk(KERN_ERR "%s: failed to attach capi_driver\n",
				driver->name);
		retval = -EIO;
	}

	MOD_DEC_USE_COUNT;
	return retval;
}

static void __exit t1isa_exit(void)
{
    detach_capi_driver(&t1isa_driver);
}

module_init(t1isa_init);
module_exit(t1isa_exit);