Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

3 files changed, 6273 insertions, 0 deletions

diff --git a/sound/pci/nm256/Makefile b/sound/pci/nm256/Makefile
new file mode 100644
index 00000000000..d91d8c51921
--- /dev/null
+++ b/sound/pci/nm256/Makefile
@@ -0,0 +1,9 @@
+#
+# Makefile for ALSA
+# Copyright (c) 2001 by Jaroslav Kysela <perex@suse.cz>
+#
+
+snd-nm256-objs := nm256.o
+
+# Toplevel Module Dependency
+obj-$(CONFIG_SND_NM256) += snd-nm256.o
diff --git a/sound/pci/nm256/nm256.c b/sound/pci/nm256/nm256.c
new file mode 100644
index 00000000000..356fbeac6f9
--- /dev/null
+++ b/sound/pci/nm256/nm256.c
@@ -0,0 +1,1657 @@
+/* 
+ * Driver for NeoMagic 256AV and 256ZX chipsets.
+ * Copyright (c) 2000 by Takashi Iwai <tiwai@suse.de>
+ *
+ * Based on nm256_audio.c OSS driver in linux kernel.
+ * The original author of OSS nm256 driver wishes to remain anonymous,
+ * so I just put my acknoledgment to him/her here.
+ * The original author's web page is found at
+ *	http://www.uglx.org/sony.html
+ *
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ */
+  
+#include <sound/driver.h>
+#include <asm/io.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/slab.h>
+#include <linux/moduleparam.h>
+#include <sound/core.h>
+#include <sound/info.h>
+#include <sound/control.h>
+#include <sound/pcm.h>
+#include <sound/ac97_codec.h>
+#include <sound/initval.h>
+
+#define CARD_NAME "NeoMagic 256AV/ZX"
+#define DRIVER_NAME "NM256"
+
+MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
+MODULE_DESCRIPTION("NeoMagic NM256AV/ZX");
+MODULE_LICENSE("GPL");
+MODULE_SUPPORTED_DEVICE("{{NeoMagic,NM256AV},"
+		"{NeoMagic,NM256ZX}}");
+
+/*
+ * some compile conditions.
+ */
+
+static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;	/* Index 0-MAX */
+static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;	/* ID for this card */
+static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;
+static int playback_bufsize[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 16};
+static int capture_bufsize[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 16};
+static int force_ac97[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 0}; /* disabled as default */
+static int buffer_top[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 0}; /* not specified */
+static int use_cache[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 0}; /* disabled */
+static int vaio_hack[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 0}; /* disabled */
+static int reset_workaround[SNDRV_CARDS];
+
+module_param_array(index, int, NULL, 0444);
+MODULE_PARM_DESC(index, "Index value for " CARD_NAME " soundcard.");
+module_param_array(id, charp, NULL, 0444);
+MODULE_PARM_DESC(id, "ID string for " CARD_NAME " soundcard.");
+module_param_array(enable, bool, NULL, 0444);
+MODULE_PARM_DESC(enable, "Enable this soundcard.");
+module_param_array(playback_bufsize, int, NULL, 0444);
+MODULE_PARM_DESC(playback_bufsize, "DAC frame size in kB for " CARD_NAME " soundcard.");
+module_param_array(capture_bufsize, int, NULL, 0444);
+MODULE_PARM_DESC(capture_bufsize, "ADC frame size in kB for " CARD_NAME " soundcard.");
+module_param_array(force_ac97, bool, NULL, 0444);
+MODULE_PARM_DESC(force_ac97, "Force to use AC97 codec for " CARD_NAME " soundcard.");
+module_param_array(buffer_top, int, NULL, 0444);
+MODULE_PARM_DESC(buffer_top, "Set the top address of audio buffer for " CARD_NAME " soundcard.");
+module_param_array(use_cache, bool, NULL, 0444);
+MODULE_PARM_DESC(use_cache, "Enable the cache for coefficient table access.");
+module_param_array(vaio_hack, bool, NULL, 0444);
+MODULE_PARM_DESC(vaio_hack, "Enable workaround for Sony VAIO notebooks.");
+module_param_array(reset_workaround, bool, NULL, 0444);
+MODULE_PARM_DESC(reset_workaround, "Enable AC97 RESET workaround for some laptops.");
+
+/*
+ * hw definitions
+ */
+
+/* The BIOS signature. */
+#define NM_SIGNATURE 0x4e4d0000
+/* Signature mask. */
+#define NM_SIG_MASK 0xffff0000
+
+/* Size of the second memory area. */
+#define NM_PORT2_SIZE 4096
+
+/* The base offset of the mixer in the second memory area. */
+#define NM_MIXER_OFFSET 0x600
+
+/* The maximum size of a coefficient entry. */
+#define NM_MAX_PLAYBACK_COEF_SIZE	0x5000
+#define NM_MAX_RECORD_COEF_SIZE		0x1260
+
+/* The interrupt register. */
+#define NM_INT_REG 0xa04
+/* And its bits. */
+#define NM_PLAYBACK_INT 0x40
+#define NM_RECORD_INT 0x100
+#define NM_MISC_INT_1 0x4000
+#define NM_MISC_INT_2 0x1
+#define NM_ACK_INT(chip, X) snd_nm256_writew(chip, NM_INT_REG, (X) << 1)
+
+/* The AV's "mixer ready" status bit and location. */
+#define NM_MIXER_STATUS_OFFSET 0xa04
+#define NM_MIXER_READY_MASK 0x0800
+#define NM_MIXER_PRESENCE 0xa06
+#define NM_PRESENCE_MASK 0x0050
+#define NM_PRESENCE_VALUE 0x0040
+
+/*
+ * For the ZX.  It uses the same interrupt register, but it holds 32
+ * bits instead of 16.
+ */
+#define NM2_PLAYBACK_INT 0x10000
+#define NM2_RECORD_INT 0x80000
+#define NM2_MISC_INT_1 0x8
+#define NM2_MISC_INT_2 0x2
+#define NM2_ACK_INT(chip, X) snd_nm256_writel(chip, NM_INT_REG, (X))
+
+/* The ZX's "mixer ready" status bit and location. */
+#define NM2_MIXER_STATUS_OFFSET 0xa06
+#define NM2_MIXER_READY_MASK 0x0800
+
+/* The playback registers start from here. */
+#define NM_PLAYBACK_REG_OFFSET 0x0
+/* The record registers start from here. */
+#define NM_RECORD_REG_OFFSET 0x200
+
+/* The rate register is located 2 bytes from the start of the register area. */
+#define NM_RATE_REG_OFFSET 2
+
+/* Mono/stereo flag, number of bits on playback, and rate mask. */
+#define NM_RATE_STEREO 1
+#define NM_RATE_BITS_16 2
+#define NM_RATE_MASK 0xf0
+
+/* Playback enable register. */
+#define NM_PLAYBACK_ENABLE_REG (NM_PLAYBACK_REG_OFFSET + 0x1)
+#define NM_PLAYBACK_ENABLE_FLAG 1
+#define NM_PLAYBACK_ONESHOT 2
+#define NM_PLAYBACK_FREERUN 4
+
+/* Mutes the audio output. */
+#define NM_AUDIO_MUTE_REG (NM_PLAYBACK_REG_OFFSET + 0x18)
+#define NM_AUDIO_MUTE_LEFT 0x8000
+#define NM_AUDIO_MUTE_RIGHT 0x0080
+
+/* Recording enable register. */
+#define NM_RECORD_ENABLE_REG (NM_RECORD_REG_OFFSET + 0)
+#define NM_RECORD_ENABLE_FLAG 1
+#define NM_RECORD_FREERUN 2
+
+/* coefficient buffer pointer */
+#define NM_COEFF_START_OFFSET	0x1c
+#define NM_COEFF_END_OFFSET	0x20
+
+/* DMA buffer offsets */
+#define NM_RBUFFER_START (NM_RECORD_REG_OFFSET + 0x4)
+#define NM_RBUFFER_END   (NM_RECORD_REG_OFFSET + 0x10)
+#define NM_RBUFFER_WMARK (NM_RECORD_REG_OFFSET + 0xc)
+#define NM_RBUFFER_CURRP (NM_RECORD_REG_OFFSET + 0x8)
+
+#define NM_PBUFFER_START (NM_PLAYBACK_REG_OFFSET + 0x4)
+#define NM_PBUFFER_END   (NM_PLAYBACK_REG_OFFSET + 0x14)
+#define NM_PBUFFER_WMARK (NM_PLAYBACK_REG_OFFSET + 0xc)
+#define NM_PBUFFER_CURRP (NM_PLAYBACK_REG_OFFSET + 0x8)
+
+/*
+ * type definitions
+ */
+
+typedef struct snd_nm256 nm256_t;
+typedef struct snd_nm256_stream nm256_stream_t;
+
+struct snd_nm256_stream {
+
+	nm256_t *chip;
+	snd_pcm_substream_t *substream;
+	int running;
+	
+	u32 buf;	/* offset from chip->buffer */
+	int bufsize;	/* buffer size in bytes */
+	void __iomem *bufptr;		/* mapped pointer */
+	unsigned long bufptr_addr;	/* physical address of the mapped pointer */
+
+	int dma_size;		/* buffer size of the substream in bytes */
+	int period_size;	/* period size in bytes */
+	int periods;		/* # of periods */
+	int shift;		/* bit shifts */
+	int cur_period;		/* current period # */
+
+};
+
+struct snd_nm256 {
+	
+	snd_card_t *card;
+
+	void __iomem *cport;		/* control port */
+	struct resource *res_cport;	/* its resource */
+	unsigned long cport_addr;	/* physical address */
+
+	void __iomem *buffer;		/* buffer */
+	struct resource *res_buffer;	/* its resource */
+	unsigned long buffer_addr;	/* buffer phyiscal address */
+
+	u32 buffer_start;		/* start offset from pci resource 0 */
+	u32 buffer_end;			/* end offset */
+	u32 buffer_size;		/* total buffer size */
+
+	u32 all_coeff_buf;		/* coefficient buffer */
+	u32 coeff_buf[2];		/* coefficient buffer for each stream */
+
+	unsigned int coeffs_current: 1;	/* coeff. table is loaded? */
+	unsigned int use_cache: 1;	/* use one big coef. table */
+	unsigned int reset_workaround: 1; /* Workaround for some laptops to avoid freeze */
+
+	int mixer_base;			/* register offset of ac97 mixer */
+	int mixer_status_offset;	/* offset of mixer status reg. */
+	int mixer_status_mask;		/* bit mask to test the mixer status */
+
+	int irq;
+	irqreturn_t (*interrupt)(int, void *, struct pt_regs *);
+	int badintrcount;		/* counter to check bogus interrupts */
+
+	nm256_stream_t streams[2];
+
+	ac97_t *ac97;
+
+	snd_pcm_t *pcm;
+
+	struct pci_dev *pci;
+
+	spinlock_t reg_lock;
+
+};
+
+
+/*
+ * include coefficient table
+ */
+#include "nm256_coef.c"
+
+
+/*
+ * PCI ids
+ */
+
+#ifndef PCI_VENDOR_ID_NEOMAGIC
+#define PCI_VENDOR_ID_NEOMEGIC 0x10c8
+#endif
+#ifndef PCI_DEVICE_ID_NEOMAGIC_NM256AV_AUDIO
+#define PCI_DEVICE_ID_NEOMAGIC_NM256AV_AUDIO 0x8005
+#endif
+#ifndef PCI_DEVICE_ID_NEOMAGIC_NM256ZX_AUDIO
+#define PCI_DEVICE_ID_NEOMAGIC_NM256ZX_AUDIO 0x8006
+#endif
+#ifndef PCI_DEVICE_ID_NEOMAGIC_NM256XL_PLUS_AUDIO
+#define PCI_DEVICE_ID_NEOMAGIC_NM256XL_PLUS_AUDIO 0x8016
+#endif
+
+
+static struct pci_device_id snd_nm256_ids[] = {
+	{PCI_VENDOR_ID_NEOMAGIC, PCI_DEVICE_ID_NEOMAGIC_NM256AV_AUDIO, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
+	{PCI_VENDOR_ID_NEOMAGIC, PCI_DEVICE_ID_NEOMAGIC_NM256ZX_AUDIO, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
+	{PCI_VENDOR_ID_NEOMAGIC, PCI_DEVICE_ID_NEOMAGIC_NM256XL_PLUS_AUDIO, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
+	{0,},
+};
+
+MODULE_DEVICE_TABLE(pci, snd_nm256_ids);
+
+
+/*
+ * lowlvel stuffs
+ */
+
+inline static u8
+snd_nm256_readb(nm256_t *chip, int offset)
+{
+	return readb(chip->cport + offset);
+}
+
+inline static u16
+snd_nm256_readw(nm256_t *chip, int offset)
+{
+	return readw(chip->cport + offset);
+}
+
+inline static u32
+snd_nm256_readl(nm256_t *chip, int offset)
+{
+	return readl(chip->cport + offset);
+}
+
+inline static void
+snd_nm256_writeb(nm256_t *chip, int offset, u8 val)
+{
+	writeb(val, chip->cport + offset);
+}
+
+inline static void
+snd_nm256_writew(nm256_t *chip, int offset, u16 val)
+{
+	writew(val, chip->cport + offset);
+}
+
+inline static void
+snd_nm256_writel(nm256_t *chip, int offset, u32 val)
+{
+	writel(val, chip->cport + offset);
+}
+
+inline static void
+snd_nm256_write_buffer(nm256_t *chip, void *src, int offset, int size)
+{
+	offset -= chip->buffer_start;
+#ifdef SNDRV_CONFIG_DEBUG
+	if (offset < 0 || offset >= chip->buffer_size) {
+		snd_printk("write_buffer invalid offset = %d size = %d\n", offset, size);
+		return;
+	}
+#endif
+	memcpy_toio(chip->buffer + offset, src, size);
+}
+
+/*
+ * coefficient handlers -- what a magic!
+ */
+
+static u16
+snd_nm256_get_start_offset(int which)
+{
+	u16 offset = 0;
+	while (which-- > 0)
+		offset += coefficient_sizes[which];
+	return offset;
+}
+
+static void
+snd_nm256_load_one_coefficient(nm256_t *chip, int stream, u32 port, int which)
+{
+	u32 coeff_buf = chip->coeff_buf[stream];
+	u16 offset = snd_nm256_get_start_offset(which);
+	u16 size = coefficient_sizes[which];
+
+	snd_nm256_write_buffer(chip, coefficients + offset, coeff_buf, size);
+	snd_nm256_writel(chip, port, coeff_buf);
+	/* ???  Record seems to behave differently than playback.  */
+	if (stream == SNDRV_PCM_STREAM_PLAYBACK)
+		size--;
+	snd_nm256_writel(chip, port + 4, coeff_buf + size);
+}
+
+static void
+snd_nm256_load_coefficient(nm256_t *chip, int stream, int number)
+{
+	/* The enable register for the specified engine.  */
+	u32 poffset = (stream == SNDRV_PCM_STREAM_CAPTURE ? NM_RECORD_ENABLE_REG : NM_PLAYBACK_ENABLE_REG);
+	u32 addr = NM_COEFF_START_OFFSET;
+
+	addr += (stream == SNDRV_PCM_STREAM_CAPTURE ? NM_RECORD_REG_OFFSET : NM_PLAYBACK_REG_OFFSET);
+
+	if (snd_nm256_readb(chip, poffset) & 1) {
+		snd_printd("NM256: Engine was enabled while loading coefficients!\n");
+		return;
+	}
+
+	/* The recording engine uses coefficient values 8-15.  */
+	number &= 7;
+	if (stream == SNDRV_PCM_STREAM_CAPTURE)
+		number += 8;
+
+	if (! chip->use_cache) {
+		snd_nm256_load_one_coefficient(chip, stream, addr, number);
+		return;
+	}
+	if (! chip->coeffs_current) {
+		snd_nm256_write_buffer(chip, coefficients, chip->all_coeff_buf,
+				       NM_TOTAL_COEFF_COUNT * 4);
+		chip->coeffs_current = 1;
+	} else {
+		u32 base = chip->all_coeff_buf;
+		u32 offset = snd_nm256_get_start_offset(number);
+		u32 end_offset = offset + coefficient_sizes[number];
+		snd_nm256_writel(chip, addr, base + offset);
+		if (stream == SNDRV_PCM_STREAM_PLAYBACK)
+			end_offset--;
+		snd_nm256_writel(chip, addr + 4, base + end_offset);
+	}
+}
+
+
+/* The actual rates supported by the card. */
+static unsigned int samplerates[8] = {
+	8000, 11025, 16000, 22050, 24000, 32000, 44100, 48000,
+};
+static snd_pcm_hw_constraint_list_t constraints_rates = {
+	.count = ARRAY_SIZE(samplerates), 
+	.list = samplerates,
+	.mask = 0,
+};
+
+/*
+ * return the index of the target rate
+ */
+static int
+snd_nm256_fixed_rate(unsigned int rate)
+{
+	unsigned int i;
+	for (i = 0; i < ARRAY_SIZE(samplerates); i++) {
+		if (rate == samplerates[i])
+			return i;
+	}
+	snd_BUG();
+	return 0;
+}
+
+/*
+ * set sample rate and format
+ */
+static void
+snd_nm256_set_format(nm256_t *chip, nm256_stream_t *s, snd_pcm_substream_t *substream)
+{
+	snd_pcm_runtime_t *runtime = substream->runtime;
+	int rate_index = snd_nm256_fixed_rate(runtime->rate);
+	unsigned char ratebits = (rate_index << 4) & NM_RATE_MASK;
+
+	s->shift = 0;
+	if (snd_pcm_format_width(runtime->format) == 16) {
+		ratebits |= NM_RATE_BITS_16;
+		s->shift++;
+	}
+	if (runtime->channels > 1) {
+		ratebits |= NM_RATE_STEREO;
+		s->shift++;
+	}
+
+	runtime->rate = samplerates[rate_index];
+
+	switch (substream->stream) {
+	case SNDRV_PCM_STREAM_PLAYBACK:
+		snd_nm256_load_coefficient(chip, 0, rate_index); /* 0 = playback */
+		snd_nm256_writeb(chip,
+				 NM_PLAYBACK_REG_OFFSET + NM_RATE_REG_OFFSET,
+				 ratebits);
+		break;
+	case SNDRV_PCM_STREAM_CAPTURE:
+		snd_nm256_load_coefficient(chip, 1, rate_index); /* 1 = record */
+		snd_nm256_writeb(chip,
+				 NM_RECORD_REG_OFFSET + NM_RATE_REG_OFFSET,
+				 ratebits);
+		break;
+	}
+}
+
+/*
+ * start / stop
+ */
+
+/* update the watermark (current period) */
+static void snd_nm256_pcm_mark(nm256_t *chip, nm256_stream_t *s, int reg)
+{
+	s->cur_period++;
+	s->cur_period %= s->periods;
+	snd_nm256_writel(chip, reg, s->buf + s->cur_period * s->period_size);
+}
+
+#define snd_nm256_playback_mark(chip, s) snd_nm256_pcm_mark(chip, s, NM_PBUFFER_WMARK)
+#define snd_nm256_capture_mark(chip, s)  snd_nm256_pcm_mark(chip, s, NM_RBUFFER_WMARK)
+
+static void
+snd_nm256_playback_start(nm256_t *chip, nm256_stream_t *s, snd_pcm_substream_t *substream)
+{
+	/* program buffer pointers */
+	snd_nm256_writel(chip, NM_PBUFFER_START, s->buf);
+	snd_nm256_writel(chip, NM_PBUFFER_END, s->buf + s->dma_size - (1 << s->shift));
+	snd_nm256_writel(chip, NM_PBUFFER_CURRP, s->buf);
+	snd_nm256_playback_mark(chip, s);
+
+	/* Enable playback engine and interrupts. */
+	snd_nm256_writeb(chip, NM_PLAYBACK_ENABLE_REG,
+			 NM_PLAYBACK_ENABLE_FLAG | NM_PLAYBACK_FREERUN);
+	/* Enable both channels. */
+	snd_nm256_writew(chip, NM_AUDIO_MUTE_REG, 0x0);
+}
+
+static void
+snd_nm256_capture_start(nm256_t *chip, nm256_stream_t *s, snd_pcm_substream_t *substream)
+{
+	/* program buffer pointers */
+	snd_nm256_writel(chip, NM_RBUFFER_START, s->buf);
+	snd_nm256_writel(chip, NM_RBUFFER_END, s->buf + s->dma_size);
+	snd_nm256_writel(chip, NM_RBUFFER_CURRP, s->buf);
+	snd_nm256_capture_mark(chip, s);
+
+	/* Enable playback engine and interrupts. */
+	snd_nm256_writeb(chip, NM_RECORD_ENABLE_REG,
+			 NM_RECORD_ENABLE_FLAG | NM_RECORD_FREERUN);
+}
+
+/* Stop the play engine. */
+static void
+snd_nm256_playback_stop(nm256_t *chip)
+{
+	/* Shut off sound from both channels. */
+	snd_nm256_writew(chip, NM_AUDIO_MUTE_REG,
+			 NM_AUDIO_MUTE_LEFT | NM_AUDIO_MUTE_RIGHT);
+	/* Disable play engine. */
+	snd_nm256_writeb(chip, NM_PLAYBACK_ENABLE_REG, 0);
+}
+
+static void
+snd_nm256_capture_stop(nm256_t *chip)
+{
+	/* Disable recording engine. */
+	snd_nm256_writeb(chip, NM_RECORD_ENABLE_REG, 0);
+}
+
+static int
+snd_nm256_playback_trigger(snd_pcm_substream_t *substream, int cmd)
+{
+	nm256_t *chip = snd_pcm_substream_chip(substream);
+	nm256_stream_t *s = (nm256_stream_t*)substream->runtime->private_data;
+	int err = 0;
+
+	snd_assert(s != NULL, return -ENXIO);
+
+	spin_lock(&chip->reg_lock);
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+		if (! s->running) {
+			snd_nm256_playback_start(chip, s, substream);
+			s->running = 1;
+		}
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+		if (s->running) {
+			snd_nm256_playback_stop(chip);
+			s->running = 0;
+		}
+		break;
+	default:
+		err = -EINVAL;
+		break;
+	}
+	spin_unlock(&chip->reg_lock);
+	return err;
+}
+
+static int
+snd_nm256_capture_trigger(snd_pcm_substream_t *substream, int cmd)
+{
+	nm256_t *chip = snd_pcm_substream_chip(substream);
+	nm256_stream_t *s = (nm256_stream_t*)substream->runtime->private_data;
+	int err = 0;
+
+	snd_assert(s != NULL, return -ENXIO);
+
+	spin_lock(&chip->reg_lock);
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+		if (! s->running) {
+			snd_nm256_capture_start(chip, s, substream);
+			s->running = 1;
+		}
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+		if (s->running) {
+			snd_nm256_capture_stop(chip);
+			s->running = 0;
+		}
+		break;
+	default:
+		err = -EINVAL;
+		break;
+	}
+	spin_unlock(&chip->reg_lock);
+	return err;
+}
+
+
+/*
+ * prepare playback/capture channel
+ */
+static int snd_nm256_pcm_prepare(snd_pcm_substream_t *substream)
+{
+	nm256_t *chip = snd_pcm_substream_chip(substream);
+	snd_pcm_runtime_t *runtime = substream->runtime;
+	nm256_stream_t *s = (nm256_stream_t*)runtime->private_data;
+
+	snd_assert(s, return -ENXIO);
+	s->dma_size = frames_to_bytes(runtime, substream->runtime->buffer_size);
+	s->period_size = frames_to_bytes(runtime, substream->runtime->period_size);
+	s->periods = substream->runtime->periods;
+	s->cur_period = 0;
+
+	spin_lock_irq(&chip->reg_lock);
+	s->running = 0;
+	snd_nm256_set_format(chip, s, substream);
+	spin_unlock_irq(&chip->reg_lock);
+
+	return 0;
+}
+
+
+/*
+ * get the current pointer
+ */
+static snd_pcm_uframes_t
+snd_nm256_playback_pointer(snd_pcm_substream_t * substream)
+{
+	nm256_t *chip = snd_pcm_substream_chip(substream);
+	nm256_stream_t *s = (nm256_stream_t*)substream->runtime->private_data;
+	unsigned long curp;
+
+	snd_assert(s, return 0);
+	curp = snd_nm256_readl(chip, NM_PBUFFER_CURRP) - (unsigned long)s->buf;
+	curp %= s->dma_size;
+	return bytes_to_frames(substream->runtime, curp);
+}
+
+static snd_pcm_uframes_t
+snd_nm256_capture_pointer(snd_pcm_substream_t * substream)
+{
+	nm256_t *chip = snd_pcm_substream_chip(substream);
+	nm256_stream_t *s = (nm256_stream_t*)substream->runtime->private_data;
+	unsigned long curp;
+
+	snd_assert(s != NULL, return 0);
+	curp = snd_nm256_readl(chip, NM_RBUFFER_CURRP) - (unsigned long)s->buf;
+	curp %= s->dma_size;	
+	return bytes_to_frames(substream->runtime, curp);
+}
+
+/* Remapped I/O space can be accessible as pointer on i386 */
+/* This might be changed in the future */
+#ifndef __i386__
+/*
+ * silence / copy for playback
+ */
+static int
+snd_nm256_playback_silence(snd_pcm_substream_t *substream,
+			   int channel, /* not used (interleaved data) */
+			   snd_pcm_uframes_t pos,
+			   snd_pcm_uframes_t count)
+{
+	snd_pcm_runtime_t *runtime = substream->runtime;
+	nm256_stream_t *s = (nm256_stream_t*)runtime->private_data;
+	count = frames_to_bytes(runtime, count);
+	pos = frames_to_bytes(runtime, pos);
+	memset_io(s->bufptr + pos, 0, count);
+	return 0;
+}
+
+static int
+snd_nm256_playback_copy(snd_pcm_substream_t *substream,
+			int channel, /* not used (interleaved data) */
+			snd_pcm_uframes_t pos,
+			void __user *src,
+			snd_pcm_uframes_t count)
+{
+	snd_pcm_runtime_t *runtime = substream->runtime;
+	nm256_stream_t *s = (nm256_stream_t*)runtime->private_data;
+	count = frames_to_bytes(runtime, count);
+	pos = frames_to_bytes(runtime, pos);
+	if (copy_from_user_toio(s->bufptr + pos, src, count))
+		return -EFAULT;
+	return 0;
+}
+
+/*
+ * copy to user
+ */
+static int
+snd_nm256_capture_copy(snd_pcm_substream_t *substream,
+		       int channel, /* not used (interleaved data) */
+		       snd_pcm_uframes_t pos,
+		       void __user *dst,
+		       snd_pcm_uframes_t count)
+{
+	snd_pcm_runtime_t *runtime = substream->runtime;
+	nm256_stream_t *s = (nm256_stream_t*)runtime->private_data;
+	count = frames_to_bytes(runtime, count);
+	pos = frames_to_bytes(runtime, pos);
+	if (copy_to_user_fromio(dst, s->bufptr + pos, count))
+		return -EFAULT;
+	return 0;
+}
+
+#endif /* !__i386__ */
+
+
+/*
+ * update playback/capture watermarks
+ */
+
+/* spinlock held! */
+static void
+snd_nm256_playback_update(nm256_t *chip)
+{
+	nm256_stream_t *s;
+
+	s = &chip->streams[SNDRV_PCM_STREAM_PLAYBACK];
+	if (s->running && s->substream) {
+		spin_unlock(&chip->reg_lock);
+		snd_pcm_period_elapsed(s->substream);
+		spin_lock(&chip->reg_lock);
+		snd_nm256_playback_mark(chip, s);
+	}
+}
+
+/* spinlock held! */
+static void
+snd_nm256_capture_update(nm256_t *chip)
+{
+	nm256_stream_t *s;
+
+	s = &chip->streams[SNDRV_PCM_STREAM_CAPTURE];
+	if (s->running && s->substream) {
+		spin_unlock(&chip->reg_lock);
+		snd_pcm_period_elapsed(s->substream);
+		spin_lock(&chip->reg_lock);
+		snd_nm256_capture_mark(chip, s);
+	}
+}
+
+/*
+ * hardware info
+ */
+static snd_pcm_hardware_t snd_nm256_playback =
+{
+	.info =			SNDRV_PCM_INFO_MMAP_IOMEM |SNDRV_PCM_INFO_MMAP_VALID |
+				SNDRV_PCM_INFO_INTERLEAVED |
+				/*SNDRV_PCM_INFO_PAUSE |*/
+				SNDRV_PCM_INFO_RESUME,
+	.formats =		SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE,
+	.rates =		SNDRV_PCM_RATE_KNOT/*24k*/ | SNDRV_PCM_RATE_8000_48000,
+	.rate_min =		8000,
+	.rate_max =		48000,
+	.channels_min =		1,
+	.channels_max =		2,
+	.periods_min =		2,
+	.periods_max =		1024,
+	.buffer_bytes_max =	128 * 1024,
+	.period_bytes_min =	256,
+	.period_bytes_max =	128 * 1024,
+};
+
+static snd_pcm_hardware_t snd_nm256_capture =
+{
+	.info =			SNDRV_PCM_INFO_MMAP_IOMEM | SNDRV_PCM_INFO_MMAP_VALID |
+				SNDRV_PCM_INFO_INTERLEAVED |
+				/*SNDRV_PCM_INFO_PAUSE |*/
+				SNDRV_PCM_INFO_RESUME,
+	.formats =		SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE,
+	.rates =		SNDRV_PCM_RATE_KNOT/*24k*/ | SNDRV_PCM_RATE_8000_48000,
+	.rate_min =		8000,
+	.rate_max =		48000,
+	.channels_min =		1,
+	.channels_max =		2,
+	.periods_min =		2,
+	.periods_max =		1024,
+	.buffer_bytes_max =	128 * 1024,
+	.period_bytes_min =	256,
+	.period_bytes_max =	128 * 1024,
+};
+
+
+/* set dma transfer size */
+static int snd_nm256_pcm_hw_params(snd_pcm_substream_t *substream, snd_pcm_hw_params_t *hw_params)
+{
+	/* area and addr are already set and unchanged */
+	substream->runtime->dma_bytes = params_buffer_bytes(hw_params);
+	return 0;
+}
+
+/*
+ * open
+ */
+static void snd_nm256_setup_stream(nm256_t *chip, nm256_stream_t *s,
+				   snd_pcm_substream_t *substream,
+				   snd_pcm_hardware_t *hw_ptr)
+{
+	snd_pcm_runtime_t *runtime = substream->runtime;
+
+	s->running = 0;
+	runtime->hw = *hw_ptr;
+	runtime->hw.buffer_bytes_max = s->bufsize;
+	runtime->hw.period_bytes_max = s->bufsize / 2;
+	runtime->dma_area = (void*) s->bufptr;
+	runtime->dma_addr = s->bufptr_addr;
+	runtime->dma_bytes = s->bufsize;
+	runtime->private_data = s;
+	s->substream = substream;
+
+	snd_pcm_set_sync(substream);
+	snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
+				   &constraints_rates);
+}
+
+static int
+snd_nm256_playback_open(snd_pcm_substream_t *substream)
+{
+	nm256_t *chip = snd_pcm_substream_chip(substream);
+
+	snd_nm256_setup_stream(chip, &chip->streams[SNDRV_PCM_STREAM_PLAYBACK],
+			       substream, &snd_nm256_playback);
+	return 0;
+}
+
+static int
+snd_nm256_capture_open(snd_pcm_substream_t *substream)
+{
+	nm256_t *chip = snd_pcm_substream_chip(substream);
+
+	snd_nm256_setup_stream(chip, &chip->streams[SNDRV_PCM_STREAM_CAPTURE],
+			       substream, &snd_nm256_capture);
+	return 0;
+}
+
+/*
+ * close - we don't have to do special..
+ */
+static int
+snd_nm256_playback_close(snd_pcm_substream_t *substream)
+{
+	return 0;
+}
+
+
+static int
+snd_nm256_capture_close(snd_pcm_substream_t *substream)
+{
+	return 0;
+}
+
+/*
+ * create a pcm instance
+ */
+static snd_pcm_ops_t snd_nm256_playback_ops = {
+	.open =		snd_nm256_playback_open,
+	.close =	snd_nm256_playback_close,
+	.ioctl =	snd_pcm_lib_ioctl,
+	.hw_params =	snd_nm256_pcm_hw_params,
+	.prepare =	snd_nm256_pcm_prepare,
+	.trigger =	snd_nm256_playback_trigger,
+	.pointer =	snd_nm256_playback_pointer,
+#ifndef __i386__
+	.copy =		snd_nm256_playback_copy,
+	.silence =	snd_nm256_playback_silence,
+#endif
+	.mmap =		snd_pcm_lib_mmap_iomem,
+};
+
+static snd_pcm_ops_t snd_nm256_capture_ops = {
+	.open =		snd_nm256_capture_open,
+	.close =	snd_nm256_capture_close,
+	.ioctl =	snd_pcm_lib_ioctl,
+	.hw_params =	snd_nm256_pcm_hw_params,
+	.prepare =	snd_nm256_pcm_prepare,
+	.trigger =	snd_nm256_capture_trigger,
+	.pointer =	snd_nm256_capture_pointer,
+#ifndef __i386__
+	.copy =		snd_nm256_capture_copy,
+#endif
+	.mmap =		snd_pcm_lib_mmap_iomem,
+};
+
+static int __devinit
+snd_nm256_pcm(nm256_t *chip, int device)
+{
+	snd_pcm_t *pcm;
+	int i, err;
+
+	for (i = 0; i < 2; i++) {
+		nm256_stream_t *s = &chip->streams[i];
+		s->bufptr = chip->buffer + (s->buf - chip->buffer_start);
+		s->bufptr_addr = chip->buffer_addr + (s->buf - chip->buffer_start);
+	}
+
+	err = snd_pcm_new(chip->card, chip->card->driver, device,
+			  1, 1, &pcm);
+	if (err < 0)
+		return err;
+
+	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_nm256_playback_ops);
+	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_nm256_capture_ops);
+
+	pcm->private_data = chip;
+	pcm->info_flags = 0;
+	chip->pcm = pcm;
+
+	return 0;
+}
+
+
+/* 
+ * Initialize the hardware. 
+ */
+static void
+snd_nm256_init_chip(nm256_t *chip)
+{
+	spin_lock_irq(&chip->reg_lock);
+	/* Reset everything. */
+	snd_nm256_writeb(chip, 0x0, 0x11);
+	snd_nm256_writew(chip, 0x214, 0);
+	/* stop sounds.. */
+	//snd_nm256_playback_stop(chip);
+	//snd_nm256_capture_stop(chip);
+	spin_unlock_irq(&chip->reg_lock);
+}
+
+
+inline static void
+snd_nm256_intr_check(nm256_t *chip)
+{
+	if (chip->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.
+		 */
+		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);
+		chip->badintrcount = 0;
+	}
+}
+
+/* 
+ * 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
+snd_nm256_interrupt(int irq, void *dev_id, struct pt_regs *dummy)
+{
+	nm256_t *chip = dev_id;
+	u16 status;
+	u8 cbyte;
+
+	status = snd_nm256_readw(chip, NM_INT_REG);
+
+	/* Not ours. */
+	if (status == 0) {
+		snd_nm256_intr_check(chip);
+		return IRQ_NONE;
+	}
+
+	chip->badintrcount = 0;
+
+	/* Rather boring; check for individual interrupts and process them. */
+
+	spin_lock(&chip->reg_lock);
+	if (status & NM_PLAYBACK_INT) {
+		status &= ~NM_PLAYBACK_INT;
+		NM_ACK_INT(chip, NM_PLAYBACK_INT);
+		snd_nm256_playback_update(chip);
+	}
+
+	if (status & NM_RECORD_INT) {
+		status &= ~NM_RECORD_INT;
+		NM_ACK_INT(chip, NM_RECORD_INT);
+		snd_nm256_capture_update(chip);
+	}
+
+	if (status & NM_MISC_INT_1) {
+		status &= ~NM_MISC_INT_1;
+		NM_ACK_INT(chip, NM_MISC_INT_1);
+		snd_printd("NM256: Got misc interrupt #1\n");
+		snd_nm256_writew(chip, NM_INT_REG, 0x8000);
+		cbyte = snd_nm256_readb(chip, 0x400);
+		snd_nm256_writeb(chip, 0x400, cbyte | 2);
+	}
+
+	if (status & NM_MISC_INT_2) {
+		status &= ~NM_MISC_INT_2;
+		NM_ACK_INT(chip, NM_MISC_INT_2);
+		snd_printd("NM256: Got misc interrupt #2\n");
+		cbyte = snd_nm256_readb(chip, 0x400);
+		snd_nm256_writeb(chip, 0x400, cbyte & ~2);
+	}
+
+	/* Unknown interrupt. */
+	if (status) {
+		snd_printd("NM256: Fire in the hole! Unknown status 0x%x\n",
+			   status);
+		/* Pray. */
+		NM_ACK_INT(chip, status);
+	}
+
+	spin_unlock(&chip->reg_lock);
+	return IRQ_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
+snd_nm256_interrupt_zx(int irq, void *dev_id, struct pt_regs *dummy)
+{
+	nm256_t *chip = dev_id;
+	u32 status;
+	u8 cbyte;
+
+	status = snd_nm256_readl(chip, NM_INT_REG);
+
+	/* Not ours. */
+	if (status == 0) {
+		snd_nm256_intr_check(chip);
+		return IRQ_NONE;
+	}
+
+	chip->badintrcount = 0;
+
+	/* Rather boring; check for individual interrupts and process them. */
+
+	spin_lock(&chip->reg_lock);
+	if (status & NM2_PLAYBACK_INT) {
+		status &= ~NM2_PLAYBACK_INT;
+		NM2_ACK_INT(chip, NM2_PLAYBACK_INT);
+		snd_nm256_playback_update(chip);
+	}
+
+	if (status & NM2_RECORD_INT) {
+		status &= ~NM2_RECORD_INT;
+		NM2_ACK_INT(chip, NM2_RECORD_INT);
+		snd_nm256_capture_update(chip);
+	}
+
+	if (status & NM2_MISC_INT_1) {
+		status &= ~NM2_MISC_INT_1;
+		NM2_ACK_INT(chip, NM2_MISC_INT_1);
+		snd_printd("NM256: Got misc interrupt #1\n");
+		cbyte = snd_nm256_readb(chip, 0x400);
+		snd_nm256_writeb(chip, 0x400, cbyte | 2);
+	}
+
+	if (status & NM2_MISC_INT_2) {
+		status &= ~NM2_MISC_INT_2;
+		NM2_ACK_INT(chip, NM2_MISC_INT_2);
+		snd_printd("NM256: Got misc interrupt #2\n");
+		cbyte = snd_nm256_readb(chip, 0x400);
+		snd_nm256_writeb(chip, 0x400, cbyte & ~2);
+	}
+
+	/* Unknown interrupt. */
+	if (status) {
+		snd_printd("NM256: Fire in the hole! Unknown status 0x%x\n",
+			   status);
+		/* Pray. */
+		NM2_ACK_INT(chip, status);
+	}
+
+	spin_unlock(&chip->reg_lock);
+	return IRQ_HANDLED;
+}
+
+/*
+ * AC97 interface
+ */
+
+/*
+ * Waits for the mixer to become ready to be written; returns a zero value
+ * if it timed out.
+ */
+static int
+snd_nm256_ac97_ready(nm256_t *chip)
+{
+	int timeout = 10;
+	u32 testaddr;
+	u16 testb;
+
+	testaddr = chip->mixer_status_offset;
+	testb = chip->mixer_status_mask;
+
+	/* 
+	 * Loop around waiting for the mixer to become ready. 
+	 */
+	while (timeout-- > 0) {
+		if ((snd_nm256_readw(chip, testaddr) & testb) == 0)
+			return 1;
+		udelay(100);
+	}
+	return 0;
+}
+
+/*
+ */
+static unsigned short
+snd_nm256_ac97_read(ac97_t *ac97, unsigned short reg)
+{
+	nm256_t *chip = ac97->private_data;
+	int res;
+
+	if (reg >= 128)
+		return 0;