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-rw-r--r--sound/oss/nm256_audio.c1707
1 files changed, 1707 insertions, 0 deletions
diff --git a/sound/oss/nm256_audio.c b/sound/oss/nm256_audio.c
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index 00000000000..f9166e13519
--- /dev/null
+++ b/sound/oss/nm256_audio.c
@@ -0,0 +1,1707 @@
+/*
+ * Audio driver for the NeoMagic 256AV and 256ZX chipsets in native
+ * mode, with AC97 mixer support.
+ *
+ * Overall design and parts of this code stolen from vidc_*.c and
+ * skeleton.c.
+ *
+ * Yeah, there are a lot of magic constants in here. You tell ME what
+ * they are. I just get this stuff psychically, remember?
+ *
+ * This driver was written by someone who wishes to remain anonymous.
+ * It is in the public domain, so share and enjoy. Try to make a profit
+ * off of it; go on, I dare you.
+ *
+ * Changes:
+ * 11-10-2000 Bartlomiej Zolnierkiewicz <bkz@linux-ide.org>
+ * Added some __init
+ * 19-04-2001 Marcus Meissner <mm@caldera.de>
+ * Ported to 2.4 PCI API.
+ */
+
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pm.h>
+#include <linux/delay.h>
+#include <linux/spinlock.h>
+#include "sound_config.h"
+#include "nm256.h"
+#include "nm256_coeff.h"
+
+int nm256_debug;
+static int force_load;
+
+/*
+ * The size of the playback reserve. When the playback buffer has less
+ * than NM256_PLAY_WMARK_SIZE bytes to output, we request a new
+ * buffer.
+ */
+#define NM256_PLAY_WMARK_SIZE 512
+
+static struct audio_driver nm256_audio_driver;
+
+static int nm256_grabInterrupt (struct nm256_info *card);
+static int nm256_releaseInterrupt (struct nm256_info *card);
+static irqreturn_t nm256_interrupt (int irq, void *dev_id, struct pt_regs *dummy);
+static irqreturn_t nm256_interrupt_zx (int irq, void *dev_id, struct pt_regs *dummy);
+static int handle_pm_event (struct pm_dev *dev, pm_request_t rqst, void *data);
+
+/* These belong in linux/pci.h. */
+#define PCI_DEVICE_ID_NEOMAGIC_NM256AV_AUDIO 0x8005
+#define PCI_DEVICE_ID_NEOMAGIC_NM256ZX_AUDIO 0x8006
+#define PCI_DEVICE_ID_NEOMAGIC_NM256XL_PLUS_AUDIO 0x8016
+
+/* List of cards. */
+static struct nm256_info *nmcard_list;
+
+/* Release the mapped-in memory for CARD. */
+static void
+nm256_release_ports (struct nm256_info *card)
+{
+ int x;
+
+ for (x = 0; x < 2; x++) {
+ if (card->port[x].ptr != NULL) {
+ iounmap (card->port[x].ptr);
+ card->port[x].ptr = NULL;
+ }
+ }
+}
+
+/*
+ * Map in the memory ports for CARD, if they aren't already mapped in
+ * and have been configured. If successful, a zero value is returned;
+ * otherwise any previously mapped-in areas are released and a non-zero
+ * value is returned.
+ *
+ * This is invoked twice, once for each port. Ideally it would only be
+ * called once, but we now need to map in the second port in order to
+ * check how much memory the card has on the 256ZX.
+ */
+static int
+nm256_remap_ports (struct nm256_info *card)
+{
+ int x;
+
+ for (x = 0; x < 2; x++) {
+ if (card->port[x].ptr == NULL && card->port[x].end_offset > 0) {
+ u32 physaddr
+ = card->port[x].physaddr + card->port[x].start_offset;
+ u32 size
+ = card->port[x].end_offset - card->port[x].start_offset;
+
+ card->port[x].ptr = ioremap_nocache (physaddr, size);
+
+ if (card->port[x].ptr == NULL) {
+ printk (KERN_ERR "NM256: Unable to remap port %d\n", x + 1);
+ nm256_release_ports (card);
+ return -1;
+ }
+ }
+ }
+ return 0;
+}
+
+/* Locate the card in our list. */
+static struct nm256_info *
+nm256_find_card (int dev)
+{
+ struct nm256_info *card;
+
+ for (card = nmcard_list; card != NULL; card = card->next_card)
+ if (card->dev[0] == dev || card->dev[1] == dev)
+ return card;
+
+ return NULL;
+}
+
+/*
+ * Ditto, but find the card struct corresponding to the mixer device DEV
+ * instead.
+ */
+static struct nm256_info *
+nm256_find_card_for_mixer (int dev)
+{
+ struct nm256_info *card;
+
+ for (card = nmcard_list; card != NULL; card = card->next_card)
+ if (card->mixer_oss_dev == dev)
+ return card;
+
+ return NULL;
+}
+
+static int usecache;
+static int buffertop;
+
+/* Check to see if we're using the bank of cached coefficients. */
+int
+nm256_cachedCoefficients (struct nm256_info *card)
+{
+ return usecache;
+}
+
+/* The actual rates supported by the card. */
+static int samplerates[9] = {
+ 8000, 11025, 16000, 22050, 24000, 32000, 44100, 48000, 99999999
+};
+
+/*
+ * Set the card samplerate, word size and stereo mode to correspond to
+ * the settings in the CARD struct for the specified device in DEV.
+ * We keep two separate sets of information, one for each device; the
+ * hardware is not actually configured until a read or write is
+ * attempted.
+ */
+
+static int
+nm256_setInfo (int dev, struct nm256_info *card)
+{
+ int x;
+ int w;
+ int targetrate;
+
+ if (card->dev[0] == dev)
+ w = 0;
+ else if (card->dev[1] == dev)
+ w = 1;
+ else
+ return -ENODEV;
+
+ targetrate = card->sinfo[w].samplerate;
+
+ if ((card->sinfo[w].bits != 8 && card->sinfo[w].bits != 16)
+ || targetrate < samplerates[0]
+ || targetrate > samplerates[7])
+ return -EINVAL;
+
+ for (x = 0; x < 8; x++)
+ if (targetrate < ((samplerates[x] + samplerates[x + 1]) / 2))
+ break;
+
+ if (x < 8) {
+ u8 ratebits = ((x << 4) & NM_RATE_MASK);
+ if (card->sinfo[w].bits == 16)
+ ratebits |= NM_RATE_BITS_16;
+ if (card->sinfo[w].stereo)
+ ratebits |= NM_RATE_STEREO;
+
+ card->sinfo[w].samplerate = samplerates[x];
+
+
+ if (card->dev_for_play == dev && card->playing) {
+ if (nm256_debug)
+ printk (KERN_DEBUG "Setting play ratebits to 0x%x\n",
+ ratebits);
+ nm256_loadCoefficient (card, 0, x);
+ nm256_writePort8 (card, 2,
+ NM_PLAYBACK_REG_OFFSET + NM_RATE_REG_OFFSET,
+ ratebits);
+ }
+
+ if (card->dev_for_record == dev && card->recording) {
+ if (nm256_debug)
+ printk (KERN_DEBUG "Setting record ratebits to 0x%x\n",
+ ratebits);
+ nm256_loadCoefficient (card, 1, x);
+ nm256_writePort8 (card, 2,
+ NM_RECORD_REG_OFFSET + NM_RATE_REG_OFFSET,
+ ratebits);
+ }
+ return 0;
+ }
+ else
+ return -EINVAL;
+}
+
+/* Start the play process going. */
+static void
+startPlay (struct nm256_info *card)
+{
+ if (! card->playing) {
+ card->playing = 1;
+ if (nm256_grabInterrupt (card) == 0) {
+ nm256_setInfo (card->dev_for_play, card);
+
+ /* Enable playback engine and interrupts. */
+ nm256_writePort8 (card, 2, NM_PLAYBACK_ENABLE_REG,
+ NM_PLAYBACK_ENABLE_FLAG | NM_PLAYBACK_FREERUN);
+
+ /* Enable both channels. */
+ nm256_writePort16 (card, 2, NM_AUDIO_MUTE_REG, 0x0);
+ }
+ }
+}
+
+/*
+ * Request one chunk of AMT bytes from the recording device. When the
+ * operation is complete, the data will be copied into BUFFER and the
+ * function DMAbuf_inputintr will be invoked.
+ */
+
+static void
+nm256_startRecording (struct nm256_info *card, char *buffer, u32 amt)
+{
+ u32 endpos;
+ int enableEngine = 0;
+ u32 ringsize = card->recordBufferSize;
+ unsigned long flags;
+
+ if (amt > (ringsize / 2)) {
+ /*
+ * Of course this won't actually work right, because the
+ * caller is going to assume we will give what we got asked
+ * for.
+ */
+ printk (KERN_ERR "NM256: Read request too large: %d\n", amt);
+ amt = ringsize / 2;
+ }
+
+ if (amt < 8) {
+ printk (KERN_ERR "NM256: Read request too small; %d\n", amt);
+ return;
+ }
+
+ spin_lock_irqsave(&card->lock,flags);
+ /*
+ * If we're not currently recording, set up the start and end registers
+ * for the recording engine.
+ */
+ if (! card->recording) {
+ card->recording = 1;
+ if (nm256_grabInterrupt (card) == 0) {
+ card->curRecPos = 0;
+ nm256_setInfo (card->dev_for_record, card);
+ nm256_writePort32 (card, 2, NM_RBUFFER_START, card->abuf2);
+ nm256_writePort32 (card, 2, NM_RBUFFER_END,
+ card->abuf2 + ringsize);
+
+ nm256_writePort32 (card, 2, NM_RBUFFER_CURRP,
+ card->abuf2 + card->curRecPos);
+ enableEngine = 1;
+ }
+ else {
+ /* Not sure what else to do here. */
+ spin_unlock_irqrestore(&card->lock,flags);
+ return;
+ }
+ }
+
+ /*
+ * If we happen to go past the end of the buffer a bit (due to a
+ * delayed interrupt) it's OK. So might as well set the watermark
+ * right at the end of the data we want.
+ */
+ endpos = card->abuf2 + ((card->curRecPos + amt) % ringsize);
+
+ card->recBuf = buffer;
+ card->requestedRecAmt = amt;
+ nm256_writePort32 (card, 2, NM_RBUFFER_WMARK, endpos);
+ /* Enable recording engine and interrupts. */
+ if (enableEngine)
+ nm256_writePort8 (card, 2, NM_RECORD_ENABLE_REG,
+ NM_RECORD_ENABLE_FLAG | NM_RECORD_FREERUN);
+
+ spin_unlock_irqrestore(&card->lock,flags);
+}
+
+/* Stop the play engine. */
+static void
+stopPlay (struct nm256_info *card)
+{
+ /* Shut off sound from both channels. */
+ nm256_writePort16 (card, 2, NM_AUDIO_MUTE_REG,
+ NM_AUDIO_MUTE_LEFT | NM_AUDIO_MUTE_RIGHT);
+ /* Disable play engine. */
+ nm256_writePort8 (card, 2, NM_PLAYBACK_ENABLE_REG, 0);
+ if (card->playing) {
+ nm256_releaseInterrupt (card);
+
+ /* Reset the relevant state bits. */
+ card->playing = 0;
+ card->curPlayPos = 0;
+ }
+}
+
+/* Stop recording. */
+static void
+stopRecord (struct nm256_info *card)
+{
+ /* Disable recording engine. */
+ nm256_writePort8 (card, 2, NM_RECORD_ENABLE_REG, 0);
+
+ if (card->recording) {
+ nm256_releaseInterrupt (card);
+
+ card->recording = 0;
+ card->curRecPos = 0;
+ }
+}
+
+/*
+ * Ring buffers, man. That's where the hip-hop, wild-n-wooly action's at.
+ * 1972? (Well, I suppose it was cheep-n-easy to implement.)
+ *
+ * Write AMT bytes of BUFFER to the playback ring buffer, and start the
+ * playback engine running. It will only accept up to 1/2 of the total
+ * size of the ring buffer. No check is made that we're about to overwrite
+ * the currently-playing sample.
+ */
+
+static void
+nm256_write_block (struct nm256_info *card, char *buffer, u32 amt)
+{
+ u32 ringsize = card->playbackBufferSize;
+ u32 endstop;
+ unsigned long flags;
+
+ if (amt > (ringsize / 2)) {
+ printk (KERN_ERR "NM256: Write request too large: %d\n", amt);
+ amt = (ringsize / 2);
+ }
+
+ if (amt < NM256_PLAY_WMARK_SIZE) {
+ printk (KERN_ERR "NM256: Write request too small: %d\n", amt);
+ return;
+ }
+
+ card->curPlayPos %= ringsize;
+
+ card->requested_amt = amt;
+
+ spin_lock_irqsave(&card->lock,flags);
+
+ if ((card->curPlayPos + amt) >= ringsize) {
+ u32 rem = ringsize - card->curPlayPos;
+
+ nm256_writeBuffer8 (card, buffer, 1,
+ card->abuf1 + card->curPlayPos,
+ rem);
+ if (amt > rem)
+ nm256_writeBuffer8 (card, buffer + rem, 1, card->abuf1,
+ amt - rem);
+ }
+ else
+ nm256_writeBuffer8 (card, buffer, 1,
+ card->abuf1 + card->curPlayPos,
+ amt);
+
+ /*
+ * Setup the start-n-stop-n-limit registers, and start that engine
+ * goin'.
+ *
+ * Normally we just let it wrap around to avoid the click-click
+ * action scene.
+ */
+ if (! card->playing) {
+ /* The PBUFFER_END register in this case points to one sample
+ before the end of the buffer. */
+ int w = (card->dev_for_play == card->dev[0] ? 0 : 1);
+ int sampsize = (card->sinfo[w].bits == 16 ? 2 : 1);
+
+ if (card->sinfo[w].stereo)
+ sampsize *= 2;
+
+ /* Need to set the not-normally-changing-registers up. */
+ nm256_writePort32 (card, 2, NM_PBUFFER_START,
+ card->abuf1 + card->curPlayPos);
+ nm256_writePort32 (card, 2, NM_PBUFFER_END,
+ card->abuf1 + ringsize - sampsize);
+ nm256_writePort32 (card, 2, NM_PBUFFER_CURRP,
+ card->abuf1 + card->curPlayPos);
+ }
+ endstop = (card->curPlayPos + amt - NM256_PLAY_WMARK_SIZE) % ringsize;
+ nm256_writePort32 (card, 2, NM_PBUFFER_WMARK, card->abuf1 + endstop);
+
+ if (! card->playing)
+ startPlay (card);
+
+ spin_unlock_irqrestore(&card->lock,flags);
+}
+
+/* We just got a card playback interrupt; process it. */
+static void
+nm256_get_new_block (struct nm256_info *card)
+{
+ /* Check to see how much got played so far. */
+ u32 amt = nm256_readPort32 (card, 2, NM_PBUFFER_CURRP) - card->abuf1;
+
+ if (amt >= card->playbackBufferSize) {
+ printk (KERN_ERR "NM256: Sound playback pointer invalid!\n");
+ amt = 0;
+ }
+
+ if (amt < card->curPlayPos)
+ amt = (card->playbackBufferSize - card->curPlayPos) + amt;
+ else
+ amt -= card->curPlayPos;
+
+ if (card->requested_amt > (amt + NM256_PLAY_WMARK_SIZE)) {
+ u32 endstop =
+ card->curPlayPos + card->requested_amt - NM256_PLAY_WMARK_SIZE;
+ nm256_writePort32 (card, 2, NM_PBUFFER_WMARK, card->abuf1 + endstop);
+ }
+ else {
+ card->curPlayPos += card->requested_amt;
+ /* Get a new block to write. This will eventually invoke
+ nm256_write_block () or stopPlay (). */
+ DMAbuf_outputintr (card->dev_for_play, 1);
+ }
+}
+
+/*
+ * Read the last-recorded block from the ring buffer, copy it into the
+ * saved buffer pointer, and invoke DMAuf_inputintr() with the recording
+ * device.
+ */
+
+static void
+nm256_read_block (struct nm256_info *card)
+{
+ /* Grab the current position of the recording pointer. */
+ u32 currptr = nm256_readPort32 (card, 2, NM_RBUFFER_CURRP) - card->abuf2;
+ u32 amtToRead = card->requestedRecAmt;
+ u32 ringsize = card->recordBufferSize;
+
+ if (currptr >= card->recordBufferSize) {
+ printk (KERN_ERR "NM256: Sound buffer record pointer invalid!\n");
+ currptr = 0;
+ }
+
+ /*
+ * This test is probably redundant; we shouldn't be here unless
+ * it's true.
+ */
+ if (card->recording) {
+ /* If we wrapped around, copy everything from the start of our
+ recording buffer to the end of the buffer. */
+ if (currptr < card->curRecPos) {
+ u32 amt = min (ringsize - card->curRecPos, amtToRead);
+
+ nm256_readBuffer8 (card, card->recBuf, 1,
+ card->abuf2 + card->curRecPos,
+ amt);
+ amtToRead -= amt;
+ card->curRecPos += amt;
+ card->recBuf += amt;
+ if (card->curRecPos == ringsize)
+ card->curRecPos = 0;
+ }
+
+ if ((card->curRecPos < currptr) && (amtToRead > 0)) {
+ u32 amt = min (currptr - card->curRecPos, amtToRead);
+ nm256_readBuffer8 (card, card->recBuf, 1,
+ card->abuf2 + card->curRecPos, amt);
+ card->curRecPos = ((card->curRecPos + amt) % ringsize);
+ }
+ card->recBuf = NULL;
+ card->requestedRecAmt = 0;
+ DMAbuf_inputintr (card->dev_for_record);
+ }
+}
+
+/*
+ * Initialize the hardware.
+ */
+static void
+nm256_initHw (struct nm256_info *card)
+{
+ /* Reset everything. */
+ nm256_writePort8 (card, 2, 0x0, 0x11);
+ nm256_writePort16 (card, 2, 0x214, 0);
+
+ stopRecord (card);
+ stopPlay (card);
+}
+
+/*
+ * Handle a potential interrupt for the device referred to by DEV_ID.
+ *
+ * I don't like the cut-n-paste job here either between the two routines,
+ * but there are sufficient differences between the two interrupt handlers
+ * that parameterizing it isn't all that great either. (Could use a macro,
+ * I suppose...yucky bleah.)
+ */
+
+static irqreturn_t
+nm256_interrupt (int irq, void *dev_id, struct pt_regs *dummy)
+{
+ struct nm256_info *card = (struct nm256_info *)dev_id;
+ u16 status;
+ static int badintrcount;
+ int handled = 0;
+
+ if ((card == NULL) || (card->magsig != NM_MAGIC_SIG)) {
+ printk (KERN_ERR "NM256: Bad card pointer\n");
+ return IRQ_NONE;
+ }
+
+ status = nm256_readPort16 (card, 2, NM_INT_REG);
+
+ /* Not ours. */
+ if (status == 0) {
+ if (badintrcount++ > 1000) {
+ /*
+ * 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.
+ */
+
+ handled = 1;
+ if (card->playing)
+ stopPlay (card);
+ if (card->recording)
+ stopRecord (card);
+ badintrcount = 0;
+ }
+ return IRQ_RETVAL(handled);
+ }
+
+ badintrcount = 0;
+
+ /* Rather boring; check for individual interrupts and process them. */
+
+ if (status & NM_PLAYBACK_INT) {
+ handled = 1;
+ status &= ~NM_PLAYBACK_INT;
+ NM_ACK_INT (card, NM_PLAYBACK_INT);
+
+ if (card->playing)
+ nm256_get_new_block (card);
+ }
+
+ if (status & NM_RECORD_INT) {
+ handled = 1;
+ 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;
+
+ handled = 1;
+ 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;
+
+ handled = 1;
+ 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) {
+ handled = 1;
+ printk (KERN_ERR "NM256: Fire in the hole! Unknown status 0x%x\n",
+ status);
+ /* Pray. */
+ NM_ACK_INT (card, status);
+ }
+ return IRQ_RETVAL(handled);
+}
+
+/*
+ * 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 irqreturn_t
+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;
+ int handled = 0;
+
+ if ((card == NULL) || (card->magsig != NM_MAGIC_SIG)) {
+ printk (KERN_ERR "NM256: Bad card pointer\n");
+ return IRQ_NONE;
+ }
+
+ 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.
+ */
+
+ handled = 1;
+ if (card->playing)
+ stopPlay (card);
+ if (card->recording)
+ stopRecord (card);
+ badintrcount = 0;
+ }
+ return IRQ_RETVAL(handled);
+ }
+
+ badintrcount = 0;
+
+ /* Rather boring; check for individual interrupts and process them. */
+
+ if (status & NM2_PLAYBACK_INT) {
+ handled = 1;
+ status &= ~NM2_PLAYBACK_INT;
+ NM2_ACK_INT (card, NM2_PLAYBACK_INT);
+
+ if (card->playing)
+ nm256_get_new_block (card);
+ }
+
+ if (status & NM2_RECORD_INT) {
+ handled = 1;
+ 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;
+
+ handled = 1;
+ 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;
+
+ handled = 1;
+ 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) {
+ handled = 1;
+ printk (KERN_ERR "NM256: Fire in the hole! Unknown status 0x%x\n",
+ status);
+ /* Pray. */
+ NM2_ACK_INT (card, status);
+ }
+ return IRQ_RETVAL(handled);
+}
+
+/*
+ * 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;
+
+ spin_lock_irqsave(&card->lock,flags);
+
+ 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;
+ }
+
+ }
+
+ spin_unlock_irqrestore(&card->lock,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); /* This crashes Dell latitudes */
+ 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, void __user *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 __iomem *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 __devinit
+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;
+ spin_lock_init(&card->lock);
+
+ /* 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_load = 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;
+ else
+ nm256_peek_for_sig (card);
+
+ card->port[0].start_offset = card->port[0].end_offset - 98304;
+
+ printk (KERN_INFO "NM256: Mapping port 1 from 0x%x - 0x%x\n",
+ card->port[0].start_offset, card->port[0].end_offset);
+
+ if (nm256_remap_ports (card)) {
+ kfree (card);
+ return 0;
+ }
+
+ /* See if we can get the interrupt. */
+
+ card->irq = pcidev->irq;
+ card->has_irq = 0;
+
+ if (nm256_grabInterrupt (card) != 0) {
+ nm256_release_ports (card);
+ kfree (card);
+ return 0;
+ }
+
+ nm256_releaseInterrupt (card);
+
+ /*
+ * Init the board.
+ */
+
+ card->playbackBufferSize = 16384;
+ card->recordBufferSize = 16384;
+
+ card->coeffBuf = card->port[0].end_offset - NM_MAX_COEFFICIENT;
+ card->abuf2 = card->coeffBuf - card->recordBufferSize;
+ card->abuf1 = card->abuf2 - card->playbackBufferSize;
+ card->allCoeffBuf = card->abuf2 - (NM_TOTAL_COEFF_COUNT * 4);
+
+ /* Fixed setting. */
+ card->mixer = NM_MIXER_OFFSET;
+ card->mixer_values_init = 0;
+
+ card->is_open_play = 0;
+ card->is_open_record = 0;
+
+ card->coeffsCurrent = 0;
+
+ card->opencnt[0] = 0; card->opencnt[1] = 0;
+
+ /* Reasonable default settings, but largely unnecessary. */
+ for (x = 0; x < 2; x++) {
+ card->sinfo[x].bits = 8;
+ card->sinfo[x].stereo = 0;
+ card->sinfo[x].samplerate = 8000;
+ }
+
+ nm256_initHw (card);
+
+ for (x = 0; x < 2; x++) {
+ if ((card->dev[x] =
+ sound_install_audiodrv(AUDIO_DRIVER_VERSION,
+ "NM256", &nm256_audio_driver,
+ sizeof(struct audio_driver),
+ DMA_NODMA, AFMT_U8 | AFMT_S16_LE,
+ NULL, -1, -1)) >= 0) {
+ /* 1K minimum buffer size. */
+ audio_devs[card->dev[x]]->min_fragment = 10;
+ /* Maximum of 8K buffer size. */
+ audio_devs[card->dev[x]]->max_fragment = 13;
+ }
+ else {
+ printk(KERN_ERR "NM256: Too many PCM devices available\n");
+ nm256_release_ports (card);
+ kfree (card);
+ return 0;
+ }
+ }
+
+ pci_set_drvdata(pcidev,card);
+
+ /* Insert the card in the list. */
+ card->next_card = nmcard_list;
+ nmcard_list = card;
+
+ printk(KERN_INFO "Initialized NeoMagic %s audio in PCI native mode\n",
+ verstr);
+
+ /*
+ * And our mixer. (We should allow support for other mixers, maybe.)
+ */
+
+ nm256_install_mixer (card);
+
+ pmdev = pm_register(PM_PCI_DEV, PM_PCI_ID(pcidev), handle_pm_event);
+ if (pmdev)
+ pmdev->data = card;
+
+ return 1;
+}
+
+
+/*
+ * PM event handler, so the card is properly reinitialized after a power
+ * event.
+ */
+static int
+handle_pm_event (struct pm_dev *dev, pm_request_t rqst, void *data)
+{
+ struct nm256_info *crd = (struct nm256_info*) dev->data;
+ if (crd) {
+ switch (rqst) {
+ case PM_SUSPEND:
+ break;
+ case PM_RESUME:
+ {
+ int playing = crd->playing;
+ nm256_full_reset (crd);
+ /*
+ * A little ugly, but that's ok; pretend the
+ * block we were playing is done.
+ */
+ if (playing)
+ DMAbuf_outputintr (crd->dev_for_play, 1);
+ }
+ break;
+ }
+ }
+ return 0;
+}
+
+static int __devinit
+nm256_probe(struct pci_dev *pcidev,const struct pci_device_id *pciid)
+{
+ if (pcidev->device == PCI_DEVICE_ID_NEOMAGIC_NM256AV_AUDIO)
+ return nm256_install(pcidev, REV_NM256AV, "256AV");
+ if (pcidev->device == PCI_DEVICE_ID_NEOMAGIC_NM256ZX_AUDIO)
+ return nm256_install(pcidev, REV_NM256ZX, "256ZX");
+ if (pcidev->device == PCI_DEVICE_ID_NEOMAGIC_NM256XL_PLUS_AUDIO)
+ return nm256_install(pcidev, REV_NM256ZX, "256XL+");
+ return -1; /* should not come here ... */
+}
+
+static void __devinit
+nm256_remove(struct pci_dev *pcidev) {
+ struct nm256_info *xcard = pci_get_drvdata(pcidev);
+ struct nm256_info *card,*next_card = NULL;
+
+ for (card = nmcard_list; card != NULL; card = next_card) {
+ next_card = card->next_card;
+ if (card == xcard) {
+ stopPlay (card);
+ stopRecord (card);
+ if (card->has_irq)
+ free_irq (card->irq, card);
+ nm256_release_ports (card);
+ sound_unload_mixerdev (card->mixer_oss_dev);
+ sound_unload_audiodev (card->dev[0]);
+ sound_unload_audiodev (card->dev[1]);
+ kfree (card);
+ break;
+ }
+ }
+ if (nmcard_list == card)
+ nmcard_list = next_card;
+}
+
+/*
+ * Open the device
+ *
+ * DEV - device
+ * MODE - mode to open device (logical OR of OPEN_READ and OPEN_WRITE)
+ *
+ * Called when opening the DMAbuf (dmabuf.c:259)
+ */
+static int
+nm256_audio_open(int dev, int mode)
+{
+ struct nm256_info *card = nm256_find_card (dev);
+ int w;
+
+ if (card == NULL)
+ return -ENODEV;
+
+ if (card->dev[0] == dev)
+ w = 0;
+ else if (card->dev[1] == dev)
+ w = 1;
+ else
+ return -ENODEV;
+
+ if (card->opencnt[w] > 0)
+ return -EBUSY;
+
+ /* No bits set? Huh? */
+ if (! ((mode & OPEN_READ) || (mode & OPEN_WRITE)))
+ return -EIO;
+
+ /*
+ * If it's open for both read and write, and the card's currently
+ * being read or written to, then do the opposite of what has
+ * already been done. Otherwise, don't specify any mode until the
+ * user actually tries to do I/O. (Some programs open the device
+ * for both read and write, but only actually do reading or writing.)
+ */
+
+ if ((mode & OPEN_WRITE) && (mode & OPEN_READ)) {
+ if (card->is_open_play)
+ mode = OPEN_WRITE;
+ else if (card->is_open_record)
+ mode = OPEN_READ;
+ else mode = 0;
+ }
+
+ if (mode & OPEN_WRITE) {
+ if (card->is_open_play == 0) {
+ card->dev_for_play = dev;
+ card->is_open_play = 1;
+ }
+ else
+ return -EBUSY;
+ }
+
+ if (mode & OPEN_READ) {
+ if (card->is_open_record == 0) {
+ card->dev_for_record = dev;
+ card->is_open_record = 1;
+ }
+ else
+ return -EBUSY;
+ }
+
+ card->opencnt[w]++;
+ return 0;
+}
+
+/*
+ * Close the device
+ *
+ * DEV - device
+ *
+ * Called when closing the DMAbuf (dmabuf.c:477)
+ * after halt_xfer
+ */
+static void
+nm256_audio_close(int dev)
+{
+ struct nm256_info *card = nm256_find_card (dev);
+
+ if (card != NULL) {
+ int w;
+
+ if (card->dev[0] == dev)
+ w = 0;
+ else if (card->dev[1] == dev)
+ w = 1;
+ else
+ return;
+
+ card->opencnt[w]--;
+ if (card->opencnt[w] <= 0) {
+ card->opencnt[w] = 0;
+
+ if (card->dev_for_play == dev) {
+ stopPlay (card);
+ card->is_open_play = 0;
+ card->dev_for_play = -1;
+ }
+
+ if (card->dev_for_record == dev) {
+ stopRecord (card);
+ card->is_open_record = 0;
+ card->dev_for_record = -1;
+ }
+ }
+ }
+}
+
+/* Standard ioctl handler. */
+static int
+nm256_audio_ioctl(int dev, unsigned int cmd, void __user *arg)
+{
+ int ret;
+ u32 oldinfo;
+ int w;
+
+ struct nm256_info *card = nm256_find_card (dev);
+
+ if (card == NULL)
+ return -ENODEV;
+
+ if (dev == card->dev[0])
+ w = 0;
+ else
+ w = 1;
+
+ /*
+ * The code here is messy. There are probably better ways to do
+ * it. (It should be possible to handle it the same way the AC97 mixer
+ * is done.)
+ */
+ switch (cmd)
+ {
+ case SOUND_PCM_WRITE_RATE:
+ if (get_user(ret, (int __user *) arg))
+ return -EFAULT;
+
+ if (ret != 0) {
+ oldinfo = card->sinfo[w].samplerate;
+ card->sinfo[w].samplerate = ret;
+ ret = nm256_setInfo(dev, card);
+ if (ret != 0)
+ card->sinfo[w].samplerate = oldinfo;
+ }
+ if (ret == 0)
+ ret = card->sinfo[w].samplerate;
+ break;
+
+ case SOUND_PCM_READ_RATE:
+ ret = card->sinfo[w].samplerate;
+ break;
+
+ case SNDCTL_DSP_STEREO:
+ if (get_user(ret, (int __user *) arg))
+ return -EFAULT;
+
+ card->sinfo[w].stereo = ret ? 1 : 0;
+ ret = nm256_setInfo (dev, card);
+ if (ret == 0)
+ ret = card->sinfo[w].stereo;
+
+ break;
+
+ case SOUND_PCM_WRITE_CHANNELS:
+ if (get_user(ret, (int __user *) arg))
+ return -EFAULT;
+
+ if (ret < 1 || ret > 3)
+ ret = card->sinfo[w].stereo + 1;
+ else {
+ card->sinfo[w].stereo = ret - 1;
+ ret = nm256_setInfo (dev, card);
+ if (ret == 0)
+ ret = card->sinfo[w].stereo + 1;
+ }
+ break;
+
+ case SOUND_PCM_READ_CHANNELS:
+ ret = card->sinfo[w].stereo + 1;
+ break;
+
+ case SNDCTL_DSP_SETFMT:
+ if (get_user(ret, (int __user *) arg))
+ return -EFAULT;
+
+ if (ret != 0) {
+ oldinfo = card->sinfo[w].bits;
+ card->sinfo[w].bits = ret;
+ ret = nm256_setInfo (dev, card);
+ if (ret != 0)
+ card->sinfo[w].bits = oldinfo;
+ }
+ if (ret == 0)
+ ret = card->sinfo[w].bits;
+ break;
+
+ case SOUND_PCM_READ_BITS:
+ ret = card->sinfo[w].bits;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+ return put_user(ret, (int __user *) arg);
+}
+
+/*
+ * Given the sound device DEV and an associated physical buffer PHYSBUF,
+ * return a pointer to the actual buffer in kernel space.
+ *
+ * This routine should exist as part of the soundcore routines.
+ */
+
+static char *
+nm256_getDMAbuffer (int dev, unsigned long physbuf)
+{
+ struct audio_operations *adev = audio_devs[dev];
+ struct dma_buffparms *dmap = adev->dmap_out;
+ char *dma_start =
+ (char *)(physbuf - (unsigned long)dmap->raw_buf_phys
+ + (unsigned long)dmap->raw_buf);
+
+ return dma_start;
+}
+
+
+/*
+ * Output a block to sound device
+ *
+ * dev - device number
+ * buf - physical address of buffer
+ * total_count - total byte count in buffer
+ * intrflag - set if this has been called from an interrupt
+ * (via DMAbuf_outputintr)
+ * restart_dma - set if engine needs to be re-initialised
+ *
+ * Called when:
+ * 1. Starting output (dmabuf.c:1327)
+ * 2. (dmabuf.c:1504)
+ * 3. A new buffer needs to be sent to the device (dmabuf.c:1579)
+ */
+static void
+nm256_audio_output_block(int dev, unsigned long physbuf,
+ int total_count, int intrflag)
+{
+ struct nm256_info *card = nm256_find_card (dev);
+
+ if (card != NULL) {
+ char *dma_buf = nm256_getDMAbuffer (dev, physbuf);
+ card->is_open_play = 1;
+ card->dev_for_play = dev;
+ nm256_write_block (card, dma_buf, total_count);
+ }
+}
+
+/* Ditto, but do recording instead. */
+static void
+nm256_audio_start_input(int dev, unsigned long physbuf, int count,
+ int intrflag)
+{
+ struct nm256_info *card = nm256_find_card (dev);
+
+ if (card != NULL) {
+ char *dma_buf = nm256_getDMAbuffer (dev, physbuf);
+ card->is_open_record = 1;
+ card->dev_for_record = dev;
+ nm256_startRecording (card, dma_buf, count);
+ }
+}
+
+/*
+ * Prepare for inputting samples to DEV.
+ * Each requested buffer will be BSIZE byes long, with a total of
+ * BCOUNT buffers.
+ */
+
+static int
+nm256_audio_prepare_for_input(int dev, int bsize, int bcount)
+{
+ struct nm256_info *card = nm256_find_card (dev);
+
+ if (card == NULL)
+ return -ENODEV;
+
+ if (card->is_open_record && card->dev_for_record != dev)
+ return -EBUSY;
+
+ audio_devs[dev]->dmap_in->flags |= DMA_NODMA;
+ return 0;
+}
+
+/*
+ * Prepare for outputting samples to `dev'
+ *
+ * Each buffer that will be passed will be `bsize' bytes long,
+ * with a total of `bcount' buffers.
+ *
+ * Called when:
+ * 1. A trigger enables audio output (dmabuf.c:978)
+ * 2. We get a write buffer without dma_mode setup (dmabuf.c:1152)
+ * 3. We restart a transfer (dmabuf.c:1324)
+ */
+
+static int
+nm256_audio_prepare_for_output(int dev, int bsize, int bcount)
+{
+ struct nm256_info *card = nm256_find_card (dev);
+
+ if (card == NULL)
+ return -ENODEV;
+
+ if (card->is_open_play && card->dev_for_play != dev)
+ return -EBUSY;
+
+ audio_devs[dev]->dmap_out->flags |= DMA_NODMA;
+ return 0;
+}
+
+/* Stop the current operations associated with DEV. */
+static void
+nm256_audio_reset(int dev)
+{
+ struct nm256_info *card = nm256_find_card (dev);
+
+ if (card != NULL) {
+ if (card->dev_for_play == dev)
+ stopPlay (card);
+ if (card->dev_for_record == dev)
+ stopRecord (card);
+ }
+}
+
+static int
+nm256_audio_local_qlen(int dev)
+{
+ return 0;
+}
+
+static struct audio_driver nm256_audio_driver =
+{
+ .owner = THIS_MODULE,
+ .open = nm256_audio_open,
+ .close = nm256_audio_close,
+ .output_block = nm256_audio_output_block,
+ .start_input = nm256_audio_start_input,
+ .ioctl = nm256_audio_ioctl,
+ .prepare_for_input = nm256_audio_prepare_for_input,
+ .prepare_for_output = nm256_audio_prepare_for_output,
+ .halt_io = nm256_audio_reset,
+ .local_qlen = nm256_audio_local_qlen,
+};
+
+static struct pci_device_id nm256_pci_tbl[] = {
+ {PCI_VENDOR_ID_NEOMAGIC, PCI_DEVICE_ID_NEOMAGIC_NM256AV_AUDIO,
+ PCI_ANY_ID, PCI_ANY_ID, 0, 0},
+ {PCI_VENDOR_ID_NEOMAGIC, PCI_DEVICE_ID_NEOMAGIC_NM256ZX_AUDIO,
+ PCI_ANY_ID, PCI_ANY_ID, 0, 0},
+ {PCI_VENDOR_ID_NEOMAGIC, PCI_DEVICE_ID_NEOMAGIC_NM256XL_PLUS_AUDIO,
+ PCI_ANY_ID, PCI_ANY_ID, 0, 0},
+ {0,}
+};
+MODULE_DEVICE_TABLE(pci, nm256_pci_tbl);
+MODULE_LICENSE("GPL");
+
+
+static struct pci_driver nm256_pci_driver = {
+ .name = "nm256_audio",
+ .id_table = nm256_pci_tbl,
+ .probe = nm256_probe,
+ .remove = nm256_remove,
+};
+
+module_param(usecache, bool, 0);
+module_param(buffertop, int, 0);
+module_param(nm256_debug, bool, 0644);
+module_param(force_load, bool, 0);
+
+static int __init do_init_nm256(void)
+{
+ printk (KERN_INFO "NeoMagic 256AV/256ZX audio driver, version 1.1p\n");
+ return pci_module_init(&nm256_pci_driver);
+}
+
+static void __exit cleanup_nm256 (void)
+{
+ pci_unregister_driver(&nm256_pci_driver);
+ pm_unregister_all (&handle_pm_event);
+}
+
+module_init(do_init_nm256);
+module_exit(cleanup_nm256);
+
+/*
+ * Local variables:
+ * c-basic-offset: 4
+ * End:
+ */