nm256_audio.c

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		stopRecord (card);
	    badintrcount = 0;
	}
	return;
    }

    badintrcount = 0;

    /* Rather boring; check for individual interrupts and process them. */

    if (status & NM_PLAYBACK_INT) {
	status &= ~NM_PLAYBACK_INT;
	NM_ACK_INT (card, NM_PLAYBACK_INT);

	if (card->playing)
	    nm256_get_new_block (card);
    }

    if (status & NM_RECORD_INT) {
	status &= ~NM_RECORD_INT;
	NM_ACK_INT (card, NM_RECORD_INT);

	if (card->recording)
	    nm256_read_block (card);
    }

    if (status & NM_MISC_INT_1) {
	u8 cbyte;

	status &= ~NM_MISC_INT_1;
	printk (KERN_ERR "NM256: Got misc interrupt #1\n");
	NM_ACK_INT (card, NM_MISC_INT_1);
	nm256_writePort16 (card, 2, NM_INT_REG, 0x8000);
	cbyte = nm256_readPort8 (card, 2, 0x400);
	nm256_writePort8 (card, 2, 0x400, cbyte | 2);
    }

    if (status & NM_MISC_INT_2) {
	u8 cbyte;

	status &= ~NM_MISC_INT_2;
	printk (KERN_ERR "NM256: Got misc interrupt #2\n");
	NM_ACK_INT (card, NM_MISC_INT_2);
	cbyte = nm256_readPort8 (card, 2, 0x400);
	nm256_writePort8 (card, 2, 0x400, cbyte & ~2);
    }

    /* Unknown interrupt. */
    if (status) {
	printk (KERN_ERR "NM256: Fire in the hole! Unknown status 0x%x\n",
		status);
	/* Pray. */
	NM_ACK_INT (card, status);
    }
}

/*
 * Handle a potential interrupt for the device referred to by DEV_ID.
 * This handler is for the 256ZX, and is very similar to the non-ZX
 * routine.
 */

static void
nm256_interrupt_zx (int irq, void *dev_id, struct pt_regs *dummy)
{
    struct nm256_info *card = (struct nm256_info *)dev_id;
    u32 status;
    static int badintrcount = 0;

    if ((card == NULL) || (card->magsig != NM_MAGIC_SIG)) {
	printk (KERN_ERR "NM256: Bad card pointer\n");
	return;
    }

    status = nm256_readPort32 (card, 2, NM_INT_REG);

    /* Not ours. */
    if (status == 0) {
	if (badintrcount++ > 1000) {
	    printk (KERN_ERR "NM256: Releasing interrupt, over 1000 invalid interrupts\n");
	    /*
	     * I'm not sure if the best thing is to stop the card from
	     * playing or just release the interrupt (after all, we're in
	     * a bad situation, so doing fancy stuff may not be such a good
	     * idea).
	     *
	     * I worry about the card engine continuing to play noise
	     * over and over, however--that could become a very
	     * obnoxious problem.  And we know that when this usually
	     * happens things are fairly safe, it just means the user's
	     * inserted a PCMCIA card and someone's spamming us with 
	     * IRQ 9s.
	     */

	    if (card->playing)
		stopPlay (card);
	    if (card->recording)
		stopRecord (card);
	    badintrcount = 0;
	}
	return;
    }

    badintrcount = 0;

    /* Rather boring; check for individual interrupts and process them. */

    if (status & NM2_PLAYBACK_INT) {
	status &= ~NM2_PLAYBACK_INT;
	NM2_ACK_INT (card, NM2_PLAYBACK_INT);

	if (card->playing)
	    nm256_get_new_block (card);
    }

    if (status & NM2_RECORD_INT) {
	status &= ~NM2_RECORD_INT;
	NM2_ACK_INT (card, NM2_RECORD_INT);

	if (card->recording)
	    nm256_read_block (card);
    }

    if (status & NM2_MISC_INT_1) {
	u8 cbyte;

	status &= ~NM2_MISC_INT_1;
	printk (KERN_ERR "NM256: Got misc interrupt #1\n");
	NM2_ACK_INT (card, NM2_MISC_INT_1);
	cbyte = nm256_readPort8 (card, 2, 0x400);
	nm256_writePort8 (card, 2, 0x400, cbyte | 2);
    }

    if (status & NM2_MISC_INT_2) {
	u8 cbyte;

	status &= ~NM2_MISC_INT_2;
	printk (KERN_ERR "NM256: Got misc interrupt #2\n");
	NM2_ACK_INT (card, NM2_MISC_INT_2);
	cbyte = nm256_readPort8 (card, 2, 0x400);
	nm256_writePort8 (card, 2, 0x400, cbyte & ~2);
    }

    /* Unknown interrupt. */
    if (status) {
	printk (KERN_ERR "NM256: Fire in the hole! Unknown status 0x%x\n",
		status);
	/* Pray. */
	NM2_ACK_INT (card, status);
    }
}

/* 
 * Request our interrupt.
 */
static int
nm256_grabInterrupt (struct nm256_info *card)
{
    if (card->has_irq++ == 0) {
	if (request_irq (card->irq, card->introutine, SA_SHIRQ,
			 "NM256_audio", card) < 0) {
	    printk (KERN_ERR "NM256: can't obtain IRQ %d\n", card->irq);
	    return -1;
	}
    }
    return 0;
}

/* 
 * Release our interrupt. 
 */
static int
nm256_releaseInterrupt (struct nm256_info *card)
{
    if (card->has_irq <= 0) {
	printk (KERN_ERR "nm256: too many calls to releaseInterrupt\n");
	return -1;
    }
    card->has_irq--;
    if (card->has_irq == 0) {
	free_irq (card->irq, card);
    }
    return 0;
}

/*
 * Waits for the mixer to become ready to be written; returns a zero value
 * if it timed out.
 */

static int
nm256_isReady (struct ac97_hwint *dev)
{
    struct nm256_info *card = (struct nm256_info *)dev->driver_private;
    int t2 = 10;
    u32 testaddr;
    u16 testb;
    int done = 0;

    if (card->magsig != NM_MAGIC_SIG) {
	printk (KERN_ERR "NM256: Bad magic signature in isReady!\n");
	return 0;
    }

    testaddr = card->mixer_status_offset;
    testb = card->mixer_status_mask;

    /* 
     * Loop around waiting for the mixer to become ready. 
     */
    while (! done && t2-- > 0) {
	if ((nm256_readPort16 (card, 2, testaddr) & testb) == 0)
	    done = 1;
	else
	    udelay (100);
    }
    return done;
}

/*
 * Return the contents of the AC97 mixer register REG.  Returns a positive
 * value if successful, or a negative error code.
 */
static int
nm256_readAC97Reg (struct ac97_hwint *dev, u8 reg)
{
    struct nm256_info *card = (struct nm256_info *)dev->driver_private;

    if (card->magsig != NM_MAGIC_SIG) {
	printk (KERN_ERR "NM256: Bad magic signature in readAC97Reg!\n");
	return -EINVAL;
    }

    if (reg < 128) {
	int res;

	nm256_isReady (dev);
	res = nm256_readPort16 (card, 2, card->mixer + reg);
	/* Magic delay.  Bleah yucky.  */
        udelay (1000);
	return res;
    }
    else
	return -EINVAL;
}

/* 
 * Writes VALUE to AC97 mixer register REG.  Returns 0 if successful, or
 * a negative error code. 
 */
static int
nm256_writeAC97Reg (struct ac97_hwint *dev, u8 reg, u16 value)
{
    unsigned long flags;
    int tries = 2;
    int done = 0;
    u32 base;

    struct nm256_info *card = (struct nm256_info *)dev->driver_private;

    if (card->magsig != NM_MAGIC_SIG) {
	printk (KERN_ERR "NM256: Bad magic signature in writeAC97Reg!\n");
	return -EINVAL;
    }

    base = card->mixer;

    save_flags (flags);
    cli ();

    nm256_isReady (dev);

    /* Wait for the write to take, too. */
    while ((tries-- > 0) && !done) {
	nm256_writePort16 (card, 2, base + reg, value);
	if (nm256_isReady (dev)) {
	    done = 1;
	    break;
	}

    }

    restore_flags (flags);
    udelay (1000);

    return ! done;
}

/* 
 * Initial register values to be written to the AC97 mixer.
 * While most of these are identical to the reset values, we do this
 * so that we have most of the register contents cached--this avoids
 * reading from the mixer directly (which seems to be problematic,
 * probably due to ignorance).
 */
struct initialValues 
{
    unsigned short port;
    unsigned short value;
};

static struct initialValues nm256_ac97_initial_values[] = 
{
    { AC97_MASTER_VOL_STEREO, 0x8000 },
    { AC97_HEADPHONE_VOL,     0x8000 },
    { AC97_MASTER_VOL_MONO,   0x0000 },
    { AC97_PCBEEP_VOL,        0x0000 },
    { AC97_PHONE_VOL,         0x0008 },
    { AC97_MIC_VOL,           0x8000 },
    { AC97_LINEIN_VOL,        0x8808 },
    { AC97_CD_VOL,            0x8808 },
    { AC97_VIDEO_VOL,         0x8808 },
    { AC97_AUX_VOL,           0x8808 },
    { AC97_PCMOUT_VOL,        0x0808 },
    { AC97_RECORD_SELECT,     0x0000 },
    { AC97_RECORD_GAIN,       0x0B0B },
    { AC97_GENERAL_PURPOSE,   0x0000 },
    { 0xffff, 0xffff }
};

/* Initialize the AC97 into a known state.  */
static int
nm256_resetAC97 (struct ac97_hwint *dev)
{
    struct nm256_info *card = (struct nm256_info *)dev->driver_private;
    int x;

    if (card->magsig != NM_MAGIC_SIG) {
	printk (KERN_ERR "NM256: Bad magic signature in resetAC97!\n");
	return -EINVAL;
    }

    /* Reset the mixer.  'Tis magic!  */
    nm256_writePort8 (card, 2, 0x6c0, 1);
    nm256_writePort8 (card, 2, 0x6cc, 0x87);
    nm256_writePort8 (card, 2, 0x6cc, 0x80);
    nm256_writePort8 (card, 2, 0x6cc, 0x0);

    if (! card->mixer_values_init) {
	for (x = 0; nm256_ac97_initial_values[x].port != 0xffff; x++) {
	    ac97_put_register (dev,
			       nm256_ac97_initial_values[x].port,
			       nm256_ac97_initial_values[x].value);
	    card->mixer_values_init = 1;
	}
    }

    return 0;
}

/*
 * We don't do anything particularly special here; it just passes the
 * mixer ioctl to the AC97 driver.
 */
static int
nm256_default_mixer_ioctl (int dev, unsigned int cmd, caddr_t arg)
{
    struct nm256_info *card = nm256_find_card_for_mixer (dev);
    if (card != NULL)
	return ac97_mixer_ioctl (&(card->mdev), cmd, arg);
    else
	return -ENODEV;
}

static struct mixer_operations nm256_mixer_operations = {
    owner:	THIS_MODULE,
    id:		"NeoMagic",
    name:	"NM256AC97Mixer",
    ioctl:	nm256_default_mixer_ioctl
};

/*
 * Default settings for the OSS mixer.  These are set last, after the
 * mixer is initialized.
 *
 * I "love" C sometimes.  Got braces?
 */
static struct ac97_mixer_value_list mixer_defaults[] = {
    { SOUND_MIXER_VOLUME,  { { 85, 85 } } },
    { SOUND_MIXER_SPEAKER, { { 100 } } },
    { SOUND_MIXER_PCM,     { { 65, 65 } } },
    { SOUND_MIXER_CD,      { { 65, 65 } } },
    { -1,                  {  { 0,  0 } } }
};


/* Installs the AC97 mixer into CARD.  */
static int __init
nm256_install_mixer (struct nm256_info *card)
{
    int mixer;

    card->mdev.reset_device = nm256_resetAC97;
    card->mdev.read_reg = nm256_readAC97Reg;
    card->mdev.write_reg = nm256_writeAC97Reg;
    card->mdev.driver_private = (void *)card;

    if (ac97_init (&(card->mdev)))
	return -1;

    mixer = sound_alloc_mixerdev();
    if (num_mixers >= MAX_MIXER_DEV) {
	printk ("NM256 mixer: Unable to alloc mixerdev\n");
	return -1;
    }

    mixer_devs[mixer] = &nm256_mixer_operations;
    card->mixer_oss_dev = mixer;

    /* Some reasonable default values.  */
    ac97_set_values (&(card->mdev), mixer_defaults);

    printk(KERN_INFO "Initialized AC97 mixer\n");
    return 0;
}

/* Perform a full reset on the hardware; this is invoked when an APM
   resume event occurs.  */
static void
nm256_full_reset (struct nm256_info *card)
{
    nm256_initHw (card);
    ac97_reset (&(card->mdev));
}

/* 
 * 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 void __init
nm256_peek_for_sig (struct nm256_info *card)
{
    u32 port1offset 
	= card->port[0].physaddr + card->port[0].end_offset - 0x0400;
    /* The signature is located 1K below the end of video RAM.  */
    char *temp = ioremap_nocache (port1offset, 16);
    /* Default buffer end is 5120 bytes below the top of RAM.  */
    u32 default_value = card->port[0].end_offset - 0x1400;
    u32 sig;

    /* Install the default value first, so we don't have to repeatedly
       do it if there is a problem.  */
    card->port[0].end_offset = default_value;

    if (temp == NULL) {
	printk (KERN_ERR "NM256: Unable to scan for card signature in video RAM\n");
	return;
    }
    sig = readl (temp);
    if ((sig & NM_SIG_MASK) == NM_SIGNATURE) {
	u32 pointer = readl (temp + 4);

	/*
	 * If it's obviously invalid, don't use it (the port already has a
	 * suitable default value set).
	 */
	if (pointer != 0xffffffff)
	    card->port[0].end_offset = pointer;

	printk (KERN_INFO "NM256: Found card signature in video RAM: 0x%x\n",
		pointer);
    }

    iounmap (temp);
}

/* 
 * Install a driver for the PCI device referenced by PCIDEV.
 * VERSTR is a human-readable version string.
 */

static int __init
nm256_install(struct pci_dev *pcidev, enum nm256rev rev, char *verstr)
{
    struct nm256_info *card;
    struct pm_dev *pmdev;
    int x;

    if (pci_enable_device(pcidev))
	    return 0;

    card = kmalloc (sizeof (struct nm256_info), GFP_KERNEL);
    if (card == NULL) {
	printk (KERN_ERR "NM256: out of memory!\n");
	return 0;
    }

    card->magsig = NM_MAGIC_SIG;
    card->playing  = 0;
    card->recording = 0;
    card->rev = rev;

    /* Init the memory port info.  */
    for (x = 0; x < 2; x++) {
	card->port[x].physaddr = pci_resource_start (pcidev, x);
	card->port[x].ptr = NULL;
	card->port[x].start_offset = 0;
	card->port[x].end_offset = 0;
    }

    /* Port 2 is easy.  */
    card->port[1].start_offset = 0;
    card->port[1].end_offset = NM_PORT2_SIZE;

    /* Yuck.  But we have to map in port 2 so we can check how much RAM the
       card has.  */
    if (nm256_remap_ports (card)) {
	kfree (card);
	return 0;
    }

    /* 
     * 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).
     */

    if (card->rev == REV_NM256AV) {
	/* Ok, try to see if this is a non-AC97 version of the hardware. */
	int pval = nm256_readPort16 (card, 2, NM_MIXER_PRESENCE);
	if ((pval & NM_PRESENCE_MASK) != NM_PRESENCE_VALUE) {
	    if (! force_load) {
		printk (KERN_ERR "NM256: This doesn't look to me like the AC97-compatible version.\n");
		printk (KERN_ERR "       You can force the driver to load by passing in the module\n");
		printk (KERN_ERR "       parameter:\n");
		printk (KERN_ERR "              force_ac97 = 1\n");
		printk (KERN_ERR "\n");
		printk (KERN_ERR "       More likely, you should be using the appropriate SB-16 or\n");
		printk (KERN_ERR "       CS4232 driver instead.  (If your BIOS has settings for\n");
		printk (KERN_ERR "       IRQ and/or DMA for the sound card, this is *not* the correct\n");
		printk (KERN_ERR "       driver to use.)\n");
		nm256_release_ports (card);
		kfree (card);
		return 0;
	    }
	    else {
		printk (KERN_INFO "NM256: Forcing driver load as per user request.\n");
	    }
	}
	else {
	 /*   printk (KERN_INFO "NM256: Congratulations. You're not running Eunice.\n")*/;
	}
	card->port[0].end_offset = 2560 * 1024;
	card->introutine = nm256_interrupt;
	card->mixer_status_offset = NM_MIXER_STATUS_OFFSET;
	card->mixer_status_mask = NM_MIXER_READY_MASK;
    } 
    else {
	/* Not sure if there is any relevant detect for the ZX or not.  */
	if (nm256_readPort8 (card, 2, 0xa0b) != 0)
	    card->port[0].end_offset = 6144 * 1024;
	else
	    card->port[0].end_offset = 4096 * 1024;

	card->introutine = nm256_interrupt_zx;
	card->mixer_status_offset = NM2_MIXER_STATUS_OFFSET;
	card->mixer_status_mask = NM2_MIXER_READY_MASK;
    }

    if (buffertop >= 98304 && buffertop < card->port[0].end_offset)
	card->port[0].end_offset = buffertop;