nm256.c

linux 内核源代码

}

/* 
 * See if the signature left by the NM256 BIOS is intact; if so, we use
 * the associated address as the end of our audio buffer in the video
 * RAM.
 */

static int __devinit
snd_nm256_peek_for_sig(struct nm256 *chip)
{
	/* The signature is located 1K below the end of video RAM.  */
	void __iomem *temp;
	/* Default buffer end is 5120 bytes below the top of RAM.  */
	unsigned long pointer_found = chip->buffer_end - 0x1400;
	u32 sig;

	temp = ioremap_nocache(chip->buffer_addr + chip->buffer_end - 0x400, 16);
	if (temp == NULL) {
		snd_printk(KERN_ERR "Unable to scan for card signature in video RAM\n");
		return -EBUSY;
	}

	sig = readl(temp);
	if ((sig & NM_SIG_MASK) == NM_SIGNATURE) {
		u32 pointer = readl(temp + 4);

		/*
		 * If it's obviously invalid, don't use it
		 */
		if (pointer == 0xffffffff ||
		    pointer < chip->buffer_size ||
		    pointer > chip->buffer_end) {
			snd_printk(KERN_ERR "invalid signature found: 0x%x\n", pointer);
			iounmap(temp);
			return -ENODEV;
		} else {
			pointer_found = pointer;
			printk(KERN_INFO "nm256: found card signature in video RAM: 0x%x\n",
			       pointer);
		}
	}

	iounmap(temp);
	chip->buffer_end = pointer_found;

	return 0;
}

#ifdef CONFIG_PM
/*
 * APM event handler, so the card is properly reinitialized after a power
 * event.
 */
static int nm256_suspend(struct pci_dev *pci, pm_message_t state)
{
	struct snd_card *card = pci_get_drvdata(pci);
	struct nm256 *chip = card->private_data;

	snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
	snd_pcm_suspend_all(chip->pcm);
	snd_ac97_suspend(chip->ac97);
	chip->coeffs_current = 0;
	pci_disable_device(pci);
	pci_save_state(pci);
	pci_set_power_state(pci, pci_choose_state(pci, state));
	return 0;
}

static int nm256_resume(struct pci_dev *pci)
{
	struct snd_card *card = pci_get_drvdata(pci);
	struct nm256 *chip = card->private_data;
	int i;

	/* Perform a full reset on the hardware */
	chip->in_resume = 1;

	pci_set_power_state(pci, PCI_D0);
	pci_restore_state(pci);
	if (pci_enable_device(pci) < 0) {
		printk(KERN_ERR "nm256: pci_enable_device failed, "
		       "disabling device\n");
		snd_card_disconnect(card);
		return -EIO;
	}
	pci_set_master(pci);

	snd_nm256_init_chip(chip);

	/* restore ac97 */
	snd_ac97_resume(chip->ac97);

	for (i = 0; i < 2; i++) {
		struct nm256_stream *s = &chip->streams[i];
		if (s->substream && s->suspended) {
			spin_lock_irq(&chip->reg_lock);
			snd_nm256_set_format(chip, s, s->substream);
			spin_unlock_irq(&chip->reg_lock);
		}
	}

	snd_power_change_state(card, SNDRV_CTL_POWER_D0);
	chip->in_resume = 0;
	return 0;
}
#endif /* CONFIG_PM */

static int snd_nm256_free(struct nm256 *chip)
{
	if (chip->streams[SNDRV_PCM_STREAM_PLAYBACK].running)
		snd_nm256_playback_stop(chip);
	if (chip->streams[SNDRV_PCM_STREAM_CAPTURE].running)
		snd_nm256_capture_stop(chip);

	if (chip->irq >= 0)
		synchronize_irq(chip->irq);

	if (chip->cport)
		iounmap(chip->cport);
	if (chip->buffer)
		iounmap(chip->buffer);
	release_and_free_resource(chip->res_cport);
	release_and_free_resource(chip->res_buffer);
	if (chip->irq >= 0)
		free_irq(chip->irq, chip);

	pci_disable_device(chip->pci);
	kfree(chip->ac97_regs);
	kfree(chip);
	return 0;
}

static int snd_nm256_dev_free(struct snd_device *device)
{
	struct nm256 *chip = device->device_data;
	return snd_nm256_free(chip);
}

static int __devinit
snd_nm256_create(struct snd_card *card, struct pci_dev *pci,
		 struct nm256 **chip_ret)
{
	struct nm256 *chip;
	int err, pval;
	static struct snd_device_ops ops = {
		.dev_free =	snd_nm256_dev_free,
	};
	u32 addr;

	*chip_ret = NULL;

	if ((err = pci_enable_device(pci)) < 0)
		return err;

	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
	if (chip == NULL) {
		pci_disable_device(pci);
		return -ENOMEM;
	}

	chip->card = card;
	chip->pci = pci;
	chip->use_cache = use_cache;
	spin_lock_init(&chip->reg_lock);
	chip->irq = -1;
	mutex_init(&chip->irq_mutex);

	/* store buffer sizes in bytes */
	chip->streams[SNDRV_PCM_STREAM_PLAYBACK].bufsize = playback_bufsize * 1024;
	chip->streams[SNDRV_PCM_STREAM_CAPTURE].bufsize = capture_bufsize * 1024;

	/* 
	 * The NM256 has two memory ports.  The first port is nothing
	 * more than a chunk of video RAM, which is used as the I/O ring
	 * buffer.  The second port has the actual juicy stuff (like the
	 * mixer and the playback engine control registers).
	 */

	chip->buffer_addr = pci_resource_start(pci, 0);
	chip->cport_addr = pci_resource_start(pci, 1);

	/* Init the memory port info.  */
	/* remap control port (#2) */
	chip->res_cport = request_mem_region(chip->cport_addr, NM_PORT2_SIZE,
					     card->driver);
	if (chip->res_cport == NULL) {
		snd_printk(KERN_ERR "memory region 0x%lx (size 0x%x) busy\n",
			   chip->cport_addr, NM_PORT2_SIZE);
		err = -EBUSY;
		goto __error;
	}
	chip->cport = ioremap_nocache(chip->cport_addr, NM_PORT2_SIZE);
	if (chip->cport == NULL) {
		snd_printk(KERN_ERR "unable to map control port %lx\n", chip->cport_addr);
		err = -ENOMEM;
		goto __error;
	}

	if (!strcmp(card->driver, "NM256AV")) {
		/* Ok, try to see if this is a non-AC97 version of the hardware. */
		pval = snd_nm256_readw(chip, NM_MIXER_PRESENCE);
		if ((pval & NM_PRESENCE_MASK) != NM_PRESENCE_VALUE) {
			if (! force_ac97) {
				printk(KERN_ERR "nm256: no ac97 is found!\n");
				printk(KERN_ERR "  force the driver to load by "
				       "passing in the module parameter\n");
				printk(KERN_ERR "    force_ac97=1\n");
				printk(KERN_ERR "  or try sb16, opl3sa2, or "
				       "cs423x drivers instead.\n");
				err = -ENXIO;
				goto __error;
			}
		}
		chip->buffer_end = 2560 * 1024;
		chip->interrupt = snd_nm256_interrupt;
		chip->mixer_status_offset = NM_MIXER_STATUS_OFFSET;
		chip->mixer_status_mask = NM_MIXER_READY_MASK;
	} else {
		/* Not sure if there is any relevant detect for the ZX or not.  */
		if (snd_nm256_readb(chip, 0xa0b) != 0)
			chip->buffer_end = 6144 * 1024;
		else
			chip->buffer_end = 4096 * 1024;

		chip->interrupt = snd_nm256_interrupt_zx;
		chip->mixer_status_offset = NM2_MIXER_STATUS_OFFSET;
		chip->mixer_status_mask = NM2_MIXER_READY_MASK;
	}
	
	chip->buffer_size = chip->streams[SNDRV_PCM_STREAM_PLAYBACK].bufsize +
		chip->streams[SNDRV_PCM_STREAM_CAPTURE].bufsize;
	if (chip->use_cache)
		chip->buffer_size += NM_TOTAL_COEFF_COUNT * 4;
	else
		chip->buffer_size += NM_MAX_PLAYBACK_COEF_SIZE + NM_MAX_RECORD_COEF_SIZE;

	if (buffer_top >= chip->buffer_size && buffer_top < chip->buffer_end)
		chip->buffer_end = buffer_top;
	else {
		/* get buffer end pointer from signature */
		if ((err = snd_nm256_peek_for_sig(chip)) < 0)
			goto __error;
	}

	chip->buffer_start = chip->buffer_end - chip->buffer_size;
	chip->buffer_addr += chip->buffer_start;

	printk(KERN_INFO "nm256: Mapping port 1 from 0x%x - 0x%x\n",
	       chip->buffer_start, chip->buffer_end);

	chip->res_buffer = request_mem_region(chip->buffer_addr,
					      chip->buffer_size,
					      card->driver);
	if (chip->res_buffer == NULL) {
		snd_printk(KERN_ERR "nm256: buffer 0x%lx (size 0x%x) busy\n",
			   chip->buffer_addr, chip->buffer_size);
		err = -EBUSY;
		goto __error;
	}
	chip->buffer = ioremap_nocache(chip->buffer_addr, chip->buffer_size);
	if (chip->buffer == NULL) {
		err = -ENOMEM;
		snd_printk(KERN_ERR "unable to map ring buffer at %lx\n", chip->buffer_addr);
		goto __error;
	}

	/* set offsets */
	addr = chip->buffer_start;
	chip->streams[SNDRV_PCM_STREAM_PLAYBACK].buf = addr;
	addr += chip->streams[SNDRV_PCM_STREAM_PLAYBACK].bufsize;
	chip->streams[SNDRV_PCM_STREAM_CAPTURE].buf = addr;
	addr += chip->streams[SNDRV_PCM_STREAM_CAPTURE].bufsize;
	if (chip->use_cache) {
		chip->all_coeff_buf = addr;
	} else {
		chip->coeff_buf[SNDRV_PCM_STREAM_PLAYBACK] = addr;
		addr += NM_MAX_PLAYBACK_COEF_SIZE;
		chip->coeff_buf[SNDRV_PCM_STREAM_CAPTURE] = addr;
	}

	/* Fixed setting. */
	chip->mixer_base = NM_MIXER_OFFSET;

	chip->coeffs_current = 0;

	snd_nm256_init_chip(chip);

	// pci_set_master(pci); /* needed? */
	
	if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0)
		goto __error;

	snd_card_set_dev(card, &pci->dev);

	*chip_ret = chip;
	return 0;

__error:
	snd_nm256_free(chip);
	return err;
}


enum { NM_BLACKLISTED, NM_RESET_WORKAROUND, NM_RESET_WORKAROUND_2 };

static struct snd_pci_quirk nm256_quirks[] __devinitdata = {
	/* HP omnibook 4150 has cs4232 codec internally */
	SND_PCI_QUIRK(0x103c, 0x0007, "HP omnibook 4150", NM_BLACKLISTED),
	/* Reset workarounds to avoid lock-ups */
	SND_PCI_QUIRK(0x104d, 0x8041, "Sony PCG-F305", NM_RESET_WORKAROUND),
	SND_PCI_QUIRK(0x1028, 0x0080, "Dell Latitude LS", NM_RESET_WORKAROUND),
	SND_PCI_QUIRK(0x1028, 0x0091, "Dell Latitude CSx", NM_RESET_WORKAROUND_2),
	{ } /* terminator */
};


static int __devinit snd_nm256_probe(struct pci_dev *pci,
				     const struct pci_device_id *pci_id)
{
	struct snd_card *card;
	struct nm256 *chip;
	int err;
	const struct snd_pci_quirk *q;

	q = snd_pci_quirk_lookup(pci, nm256_quirks);
	if (q) {
		snd_printdd(KERN_INFO "nm256: Enabled quirk for %s.\n", q->name);
		switch (q->value) {
		case NM_BLACKLISTED:
			printk(KERN_INFO "nm256: The device is blacklisted. "
			       "Loading stopped\n");
			return -ENODEV;
		case NM_RESET_WORKAROUND_2:
			reset_workaround_2 = 1;
			/* Fall-through */
		case NM_RESET_WORKAROUND:
			reset_workaround = 1;
			break;
		}
	}

	card = snd_card_new(index, id, THIS_MODULE, 0);
	if (card == NULL)
		return -ENOMEM;

	switch (pci->device) {
	case PCI_DEVICE_ID_NEOMAGIC_NM256AV_AUDIO:
		strcpy(card->driver, "NM256AV");
		break;
	case PCI_DEVICE_ID_NEOMAGIC_NM256ZX_AUDIO:
		strcpy(card->driver, "NM256ZX");
		break;
	case PCI_DEVICE_ID_NEOMAGIC_NM256XL_PLUS_AUDIO:
		strcpy(card->driver, "NM256XL+");
		break;
	default:
		snd_printk(KERN_ERR "invalid device id 0x%x\n", pci->device);
		snd_card_free(card);
		return -EINVAL;
	}

	if (vaio_hack)
		buffer_top = 0x25a800;	/* this avoids conflicts with XFree86 server */

	if (playback_bufsize < 4)
		playback_bufsize = 4;
	if (playback_bufsize > 128)
		playback_bufsize = 128;
	if (capture_bufsize < 4)
		capture_bufsize = 4;
	if (capture_bufsize > 128)
		capture_bufsize = 128;
	if ((err = snd_nm256_create(card, pci, &chip)) < 0) {
		snd_card_free(card);
		return err;
	}
	card->private_data = chip;

	if (reset_workaround) {
		snd_printdd(KERN_INFO "nm256: reset_workaround activated\n");
		chip->reset_workaround = 1;
	}

	if (reset_workaround_2) {
		snd_printdd(KERN_INFO "nm256: reset_workaround_2 activated\n");
		chip->reset_workaround_2 = 1;
	}

	if ((err = snd_nm256_pcm(chip, 0)) < 0 ||
	    (err = snd_nm256_mixer(chip)) < 0) {
		snd_card_free(card);
		return err;
	}

	sprintf(card->shortname, "NeoMagic %s", card->driver);
	sprintf(card->longname, "%s at 0x%lx & 0x%lx, irq %d",
		card->shortname,
		chip->buffer_addr, chip->cport_addr, chip->irq);

	if ((err = snd_card_register(card)) < 0) {
		snd_card_free(card);
		return err;
	}

	pci_set_drvdata(pci, card);
	return 0;
}

static void __devexit snd_nm256_remove(struct pci_dev *pci)
{
	snd_card_free(pci_get_drvdata(pci));
	pci_set_drvdata(pci, NULL);
}


static struct pci_driver driver = {
	.name = "NeoMagic 256",
	.id_table = snd_nm256_ids,
	.probe = snd_nm256_probe,
	.remove = __devexit_p(snd_nm256_remove),
#ifdef CONFIG_PM
	.suspend = nm256_suspend,
	.resume = nm256_resume,
#endif
};


static int __init alsa_card_nm256_init(void)
{
	return pci_register_driver(&driver);
}

static void __exit alsa_card_nm256_exit(void)
{
	pci_unregister_driver(&driver);
}

module_init(alsa_card_nm256_init)
module_exit(alsa_card_nm256_exit)