main.c

讲述linux的初始化过程

				    VTFT, 0xffff,
				    CVCF, 0xffff,
				    PTRX, 0,
				    CPF, 0,
				    CCR, 0,

				    PSST, 0,
				    DSL, 0x10,
				    CCCA, 0,
				    Z1, 0,
				    Z2, 0,
				    FXRT, 0xd01c0000,

				    ATKHLDM, 0,
				    DCYSUSM, 0,
				    IFATN, 0xffff,
				    PEFE, 0,
				    FMMOD, 0,
				    TREMFRQ, 24,	/* 1 Hz */
				    FM2FRQ2, 24,	/* 1 Hz */
				    TEMPENV, 0,

				    /*** These are last so OFF prevents writing ***/
				    LFOVAL2, 0,
				    LFOVAL1, 0,
				    ATKHLDV, 0,
				    ENVVOL, 0,
				    ENVVAL, 0,
                                    TAGLIST_END);
	}

	/*
	 ** Init to 0x02109204 :
	 ** Clock accuracy    = 0     (1000ppm)
	 ** Sample Rate       = 2     (48kHz)
	 ** Audio Channel     = 1     (Left of 2)
	 ** Source Number     = 0     (Unspecified)
	 ** Generation Status = 1     (Original for Cat Code 12)
	 ** Cat Code          = 12    (Digital Signal Mixer)
	 ** Mode              = 0     (Mode 0)
	 ** Emphasis          = 0     (None)
	 ** CP                = 1     (Copyright unasserted)
	 ** AN                = 0     (Digital audio)
	 ** P                 = 0     (Consumer)
	 */

	sblive_writeptr_tag(card, 0,

			    /* SPDIF0 */
			    SPCS0, (SPCS_CLKACCY_1000PPM | 0x002000000 |
				    SPCS_CHANNELNUM_LEFT | SPCS_SOURCENUM_UNSPEC | SPCS_GENERATIONSTATUS | 0x00001200 | SPCS_EMPHASIS_NONE | SPCS_COPYRIGHT),

			    /* SPDIF1 */
			    SPCS1, (SPCS_CLKACCY_1000PPM | 0x002000000 |
				    SPCS_CHANNELNUM_LEFT | SPCS_SOURCENUM_UNSPEC | SPCS_GENERATIONSTATUS | 0x00001200 | SPCS_EMPHASIS_NONE | SPCS_COPYRIGHT),

			    /* SPDIF2 & SPDIF3 */
			    SPCS2, (SPCS_CLKACCY_1000PPM | 0x002000000 |
				    SPCS_CHANNELNUM_LEFT | SPCS_SOURCENUM_UNSPEC | SPCS_GENERATIONSTATUS | 0x00001200 | SPCS_EMPHASIS_NONE | SPCS_COPYRIGHT),

			    TAGLIST_END);

	fx_init(card);		/* initialize effects engine */

	card->tankmem.size = 0;

	card->virtualpagetable.size = MAXPAGES * sizeof(u32);

	if ((card->virtualpagetable.addr = pci_alloc_consistent(card->pci_dev, card->virtualpagetable.size, &card->virtualpagetable.dma_handle)) ==
	    NULL) {
		ERROR();
		return -1;
	}

	card->silentpage.size = EMUPAGESIZE;

	if ((card->silentpage.addr = pci_alloc_consistent(card->pci_dev, card->silentpage.size, &card->silentpage.dma_handle)) == NULL) {
		ERROR();
		pci_free_consistent(card->pci_dev, card->virtualpagetable.size, card->virtualpagetable.addr, card->virtualpagetable.dma_handle);
		return -1;
	}

	for (pagecount = 0; pagecount < MAXPAGES; pagecount++)
		((u32 *) card->virtualpagetable.addr)[pagecount] = (card->silentpage.dma_handle * 2) | pagecount;

	/* Init page table & tank memory base register */
	sblive_writeptr_tag(card, 0,
			    PTB, card->virtualpagetable.dma_handle,
			    TCB, 0,
			    TCBS, 0,
			    TAGLIST_END);

	for (nCh = 0; nCh < NUM_G; nCh++) {
		sblive_writeptr_tag(card, nCh,
				    MAPA, MAP_PTI_MASK | (card->silentpage.dma_handle * 2),
				    MAPB, MAP_PTI_MASK | (card->silentpage.dma_handle * 2),
				    TAGLIST_END);
	}

	/* Hokay, now enable the AUD bit */
	/* Enable Audio = 1 */
	/* Mute Disable Audio = 0 */
	/* Lock Tank Memory = 1 */
	/* Lock Sound Memory = 0 */
	/* Auto Mute = 1 */

	sblive_rmwac97(card, AC97_MASTERVOLUME, 0x8000, 0x8000);

	sblive_writeac97(card, AC97_MASTERVOLUME, 0);
	sblive_writeac97(card, AC97_PCMOUTVOLUME, 0);

	if(card->model == 0x20 || card->model == 0xc400 ||
	  (card->model == 0x21 && card->chiprev < 6))
	        emu10k1_writefn0(card, HCFG, HCFG_AUDIOENABLE  | HCFG_LOCKTANKCACHE_MASK | HCFG_AUTOMUTE);
	else
		emu10k1_writefn0(card, HCFG, HCFG_AUDIOENABLE  | HCFG_LOCKTANKCACHE_MASK | HCFG_AUTOMUTE | HCFG_JOYENABLE);

	/* FIXME: TOSLink detection */
	card->has_toslink = 0;

/*	tmp = sblive_readfn0(card, HCFG);
	if (tmp & (HCFG_GPINPUT0 | HCFG_GPINPUT1)) {
		sblive_writefn0(card, HCFG, tmp | 0x800);

		udelay(512);

		if (tmp != (sblive_readfn0(card, HCFG) & ~0x800)) {
			card->has_toslink = 1;
			sblive_writefn0(card, HCFG, tmp);
		}
	}
*/
	return 0;
}

static int __devinit emu10k1_init(struct emu10k1_card *card)
{
	/* Init Card */
	if (hw_init(card) < 0)
		return -1;

	voice_init(card);
	timer_init(card);
	addxmgr_init(card);

	DPD(2, "  hw control register -> 0x%x\n", emu10k1_readfn0(card, HCFG));

	return 0;
}

static void __devexit midi_exit(struct emu10k1_card *card)
{
	tasklet_unlock_wait(&card->mpuout->tasklet);
	kfree(card->mpuout);

	tasklet_unlock_wait(&card->mpuin->tasklet);
	kfree(card->mpuin);

	return;
}

static void __devinit emu10k1_exit(struct emu10k1_card *card)
{
	int ch;

	emu10k1_writefn0(card, INTE, 0);

	/** Shutdown the chip **/
	for (ch = 0; ch < NUM_G; ch++)
		sblive_writeptr(card, DCYSUSV, ch, 0);

	for (ch = 0; ch < NUM_G; ch++) {
		sblive_writeptr_tag(card, ch,
				    VTFT, 0,
				    CVCF, 0,
				    PTRX, 0,
				    CPF, 0,
				    TAGLIST_END);
	}

	/* Disable audio and lock cache */
	emu10k1_writefn0(card, HCFG, HCFG_LOCKSOUNDCACHE | HCFG_LOCKTANKCACHE_MASK | HCFG_MUTEBUTTONENABLE);

	sblive_writeptr_tag(card, 0,
                            PTB, 0,

			    /* Reset recording buffers */
			    MICBS, ADCBS_BUFSIZE_NONE,
			    MICBA, 0,
			    FXBS, ADCBS_BUFSIZE_NONE,
			    FXBA, 0,
			    FXWC, 0,
			    ADCBS, ADCBS_BUFSIZE_NONE,
			    ADCBA, 0,
			    TCBS, 0,
			    TCB, 0,
			    DBG, 0x8000,

			    /* Disable channel interrupt */
			    CLIEL, 0,
			    CLIEH, 0,
			    SOLEL, 0,
			    SOLEH, 0,
			    TAGLIST_END);


	pci_free_consistent(card->pci_dev, card->virtualpagetable.size, card->virtualpagetable.addr, card->virtualpagetable.dma_handle);
	pci_free_consistent(card->pci_dev, card->silentpage.size, card->silentpage.addr, card->silentpage.dma_handle);
	
	if(card->tankmem.size != 0)
		pci_free_consistent(card->pci_dev, card->tankmem.size, card->tankmem.addr, card->tankmem.dma_handle);

	return;
}

/* Driver initialization routine */
static int __devinit emu10k1_probe(struct pci_dev *pci_dev, const struct pci_device_id *pci_id)
{
	struct emu10k1_card *card;
	u32 subsysvid;

	if ((card = kmalloc(sizeof(struct emu10k1_card), GFP_KERNEL)) == NULL) {
		printk(KERN_ERR "emu10k1: out of memory\n");
		return -ENOMEM;
	}
	memset(card, 0, sizeof(struct emu10k1_card));

	if (!pci_dma_supported(pci_dev, EMU10K1_DMA_MASK)) {
		printk(KERN_ERR "emu10k1: architecture does not support 32bit PCI busmaster DMA\n");
		kfree(card);
		return -ENODEV;
	}

	if (pci_enable_device(pci_dev)) {
		kfree(card);
		return -ENODEV;
	}

	pci_set_master(pci_dev);

	card->iobase = pci_resource_start(pci_dev, 0);
	card->length = pci_resource_len(pci_dev, 0); 

	if (request_region(card->iobase, card->length, card_names[pci_id->driver_data]) == NULL) {
		printk(KERN_ERR "emu10k1: IO space in use\n");
		kfree(card);
		return -ENODEV;
	}

	pci_set_drvdata(pci_dev, card);
	PCI_SET_DMA_MASK(pci_dev, EMU10K1_DMA_MASK);

	card->irq = pci_dev->irq;
	card->pci_dev = pci_dev;

	/* Reserve IRQ Line */
	if (request_irq(card->irq, emu10k1_interrupt, SA_SHIRQ, card_names[pci_id->driver_data], card)) {
		printk(KERN_ERR "emu10k1: IRQ in use\n");
		goto err_irq;
	}

	pci_read_config_byte(pci_dev, PCI_REVISION_ID, &card->chiprev);
	pci_read_config_word(pci_dev, PCI_SUBSYSTEM_ID, &card->model);

	printk(KERN_INFO "emu10k1: %s rev %d model 0x%x found, IO at 0x%04lx-0x%04lx, IRQ %d\n",
		card_names[pci_id->driver_data], card->chiprev, card->model, card->iobase,
		card->iobase + card->length - 1, card->irq);

	pci_read_config_dword(pci_dev, PCI_SUBSYSTEM_VENDOR_ID, &subsysvid);
	card->isaps = (subsysvid == EMU_APS_SUBID);

	spin_lock_init(&card->lock);
	init_MUTEX(&card->open_sem);
	card->open_mode = 0;
	init_waitqueue_head(&card->open_wait);

	/* Register devices */
	if ((card->audio_num = register_sound_dsp(&emu10k1_audio_fops, -1)) < 0) {
		printk(KERN_ERR "emu10k1: cannot register first audio device!\n");
		goto err_dev0;
	}

	if ((card->audio1_num = register_sound_dsp(&emu10k1_audio_fops, -1)) < 0) {
		printk(KERN_ERR "emu10k1: cannot register second audio device!\n");
		goto err_dev1;
	}

	if ((card->mixer_num = register_sound_mixer(&emu10k1_mixer_fops, -1)) < 0) {
		printk(KERN_ERR "emu10k1: cannot register mixer device!\n");
		goto err_dev2;
	}

	if ((card->midi_num = register_sound_midi(&emu10k1_midi_fops, -1)) < 0) {
		printk(KERN_ERR "emu10k1: cannot register midi device!\n");
		goto err_dev3;
	}

	if (emu10k1_init(card) < 0) {
		printk(KERN_ERR "emu10k1: cannot initialize device!\n");
		goto err_emu10k1_init;
	}

	if (midi_init(card) < 0) {
		printk(KERN_ERR "emu10k1: cannot initialize midi!\n");
		goto err_midi_init;
	}

	audio_init(card);
	mixer_init(card);

	if (card->isaps)
		emu10k1_ecard_init(card);

	list_add(&card->list, &emu10k1_devs);

	return 0;

      err_midi_init:
	emu10k1_exit(card);

      err_emu10k1_init:
	unregister_sound_midi(card->midi_num);

      err_dev3:
	unregister_sound_mixer(card->mixer_num);

      err_dev2:
	unregister_sound_dsp(card->audio1_num);

      err_dev1:
	unregister_sound_dsp(card->audio_num);

      err_dev0:
	free_irq(card->irq, card);

      err_irq:
	release_region(card->iobase, card->length);
	kfree(card);

	return -ENODEV;
}

static void __devexit emu10k1_remove(struct pci_dev *pci_dev)
{
	struct emu10k1_card *card = pci_get_drvdata(pci_dev);

	midi_exit(card);
	emu10k1_exit(card);

	unregister_sound_midi(card->midi_num);
	
	unregister_sound_mixer(card->mixer_num);

	unregister_sound_dsp(card->audio1_num);
	unregister_sound_dsp(card->audio_num);

	free_irq(card->irq, card);
	release_region(card->iobase, card->length);

	list_del(&card->list);

	kfree(card);

	pci_set_drvdata(pci_dev, NULL);
}

MODULE_AUTHOR("Bertrand Lee, Cai Ying. (Email to: [e-mail])");
MODULE_DESCRIPTION("Creative EMU10K1 PCI Audio Driver v" DRIVER_VERSION "\nCopyright (C) 1999 Creative Technology Ltd.");

static struct pci_driver emu10k1_pci_driver = {
	name:"emu10k1",
	id_table:emu10k1_pci_tbl,
	probe:emu10k1_probe,
	remove:emu10k1_remove,
};

static int __init emu10k1_init_module(void)
{
	printk(KERN_INFO "Creative EMU10K1 PCI Audio Driver, version " DRIVER_VERSION ", " __TIME__ " " __DATE__ "\n");

	return pci_module_init(&emu10k1_pci_driver);
}

static void __exit emu10k1_cleanup_module(void)
{
	pci_unregister_driver(&emu10k1_pci_driver);

	return;
}

module_init(emu10k1_init_module);
module_exit(emu10k1_cleanup_module);