[ALSA] Add DBRI driver on Sparcs

Documentation,SPARC,/sparc/Makefile
Add the DBRI driver on Sparcs by Martin Habets <mhabets@users.sourceforge.net>
(moved from alsa-driver tree).

Signed-off-by: Takashi Iwai <tiwai@suse.de>

3 files changed, 2741 insertions, 4 deletions

diff --git a/sound/sparc/Kconfig b/sound/sparc/Kconfig
index f0fce1d..25a8a55 100644
--- a/sound/sparc/Kconfig
+++ b/sound/sparc/Kconfig
@@ -13,7 +13,6 @@ config SND_SUN_AMD7930
 	  To compile this driver as a module, choose M here: the module
 	  will be called snd-sun-amd7930.
 
-#  dep_tristate 'Sun DBRI' CONFIG_SND_SUN_DBRI $CONFIG_SND
 config SND_SUN_CS4231
 	tristate "Sun CS4231"
 	depends on SND
@@ -24,5 +23,14 @@ config SND_SUN_CS4231
 	  To compile this driver as a module, choose M here: the module
 	  will be called snd-sun-cs4231.
 
-endmenu
+config SND_SUN_DBRI
+	tristate "Sun DBRI"
+	depends on SND && SBUS
+	select SND_PCM
+	help
+	  Say Y here to include support for DBRI sound device on Sun.
 
+	  To compile this driver as a module, choose M here: the module
+	  will be called snd-sun-dbri.
+
+endmenu
diff --git a/sound/sparc/Makefile b/sound/sparc/Makefile
index 6809cc9..3cd89c6 100644
--- a/sound/sparc/Makefile
+++ b/sound/sparc/Makefile
@@ -4,9 +4,9 @@
 #
 
 snd-sun-amd7930-objs := amd7930.o
-#snd-sun-dbri-objs := dbri.o
 snd-sun-cs4231-objs := cs4231.o
+snd-sun-dbri-objs := dbri.o
 
 obj-$(CONFIG_SND_SUN_AMD7930) += snd-sun-amd7930.o
-#obj-$(CONFIG_SND_SUN_DBRI) += snd-sun-dbri.o
 obj-$(CONFIG_SND_SUN_CS4231) += snd-sun-cs4231.o
+obj-$(CONFIG_SND_SUN_DBRI) += snd-sun-dbri.o
diff --git a/sound/sparc/dbri.c b/sound/sparc/dbri.c
new file mode 100644
index 0000000..941c7b1
--- /dev/null
+++ b/sound/sparc/dbri.c
@@ -0,0 +1,2729 @@
+/*
+ * Driver for DBRI sound chip found on Sparcs.
+ * Copyright (C) 2004 Martin Habets (mhabets@users.sourceforge.net)
+ *
+ * Based entirely upon drivers/sbus/audio/dbri.c which is:
+ * Copyright (C) 1997 Rudolf Koenig (rfkoenig@immd4.informatik.uni-erlangen.de)
+ * Copyright (C) 1998, 1999 Brent Baccala (baccala@freesoft.org)
+ *
+ * This is the lowlevel driver for the DBRI & MMCODEC duo used for ISDN & AUDIO
+ * on Sun SPARCstation 10, 20, LX and Voyager models.
+ *
+ * - DBRI: AT&T T5900FX Dual Basic Rates ISDN Interface. It is a 32 channel
+ *   data time multiplexer with ISDN support (aka T7259)
+ *   Interfaces: SBus,ISDN NT & TE, CHI, 4 bits parallel.
+ *   CHI: (spelled ki) Concentration Highway Interface (AT&T or Intel bus ?).
+ *   Documentation:
+ *   - "STP 4000SBus Dual Basic Rate ISDN (DBRI) Tranceiver" from
+ *     Sparc Technology Business (courtesy of Sun Support)
+ *   - Data sheet of the T7903, a newer but very similar ISA bus equivalent
+ *     available from the Lucent (formarly AT&T microelectronics) home
+ *     page.
+ *   - http://www.freesoft.org/Linux/DBRI/
+ * - MMCODEC: Crystal Semiconductor CS4215 16 bit Multimedia Audio Codec
+ *   Interfaces: CHI, Audio In & Out, 2 bits parallel
+ *   Documentation: from the Crystal Semiconductor home page.
+ *
+ * The DBRI is a 32 pipe machine, each pipe can transfer some bits between
+ * memory and a serial device (long pipes, nr 0-15) or between two serial
+ * devices (short pipes, nr 16-31), or simply send a fixed data to a serial
+ * device (short pipes).
+ * A timeslot defines the bit-offset and nr of bits read from a serial device.
+ * The timeslots are linked to 6 circular lists, one for each direction for
+ * each serial device (NT,TE,CHI). A timeslot is associated to 1 or 2 pipes
+ * (the second one is a monitor/tee pipe, valid only for serial input).
+ *
+ * The mmcodec is connected via the CHI bus and needs the data & some
+ * parameters (volume, balance, output selection) timemultiplexed in 8 byte
+ * chunks. It also has a control mode, which serves for audio format setting.
+ *
+ * Looking at the CS4215 data sheet it is easy to set up 2 or 4 codecs on
+ * the same CHI bus, so I thought perhaps it is possible to use the onboard
+ * & the speakerbox codec simultanously, giving 2 (not very independent :-)
+ * audio devices. But the SUN HW group decided against it, at least on my
+ * LX the speakerbox connector has at least 1 pin missing and 1 wrongly
+ * connected.
+ */
+
+#include <sound/driver.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/info.h>
+#include <sound/control.h>
+#include <sound/initval.h>
+
+#include <asm/irq.h>
+#include <asm/io.h>
+#include <asm/sbus.h>
+#include <asm/atomic.h>
+
+MODULE_AUTHOR("Rudolf Koenig, Brent Baccala and Martin Habets");
+MODULE_DESCRIPTION("Sun DBRI");
+MODULE_LICENSE("GPL");
+MODULE_SUPPORTED_DEVICE("{{Sun,DBRI}}");
+
+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;	/* Enable this card */
+
+module_param_array(index, int, NULL, 0444);
+MODULE_PARM_DESC(index, "Index value for Sun DBRI soundcard.");
+module_param_array(id, charp, NULL, 0444);
+MODULE_PARM_DESC(id, "ID string for Sun DBRI soundcard.");
+module_param_array(enable, bool, NULL, 0444);
+MODULE_PARM_DESC(enable, "Enable Sun DBRI soundcard.");
+
+#define DBRI_DEBUG
+
+#define D_INT	(1<<0)
+#define D_GEN	(1<<1)
+#define D_CMD	(1<<2)
+#define D_MM	(1<<3)
+#define D_USR	(1<<4)
+#define D_DESC	(1<<5)
+
+static int dbri_debug = 0;
+module_param(dbri_debug, int, 0444);
+MODULE_PARM_DESC(dbri_debug, "Debug value for Sun DBRI soundcard.");
+
+#ifdef DBRI_DEBUG
+static char *cmds[] = {
+	"WAIT", "PAUSE", "JUMP", "IIQ", "REX", "SDP", "CDP", "DTS",
+	"SSP", "CHI", "NT", "TE", "CDEC", "TEST", "CDM", "RESRV"
+};
+
+#define dprintk(a, x...) if(dbri_debug & a) printk(KERN_DEBUG x)
+
+#define DBRI_CMD(cmd, intr, value) ((cmd << 28) |			\
+				    (1 << 27) | \
+				    value)
+#else
+#define dprintk(a, x...)
+
+#define DBRI_CMD(cmd, intr, value) ((cmd << 28) |			\
+				    (intr << 27) | \
+				    value)
+#endif				/* DBRI_DEBUG */
+
+/***************************************************************************
+	CS4215 specific definitions and structures
+****************************************************************************/
+
+struct cs4215 {
+	__u8 data[4];		/* Data mode: Time slots 5-8 */
+	__u8 ctrl[4];		/* Ctrl mode: Time slots 1-4 */
+	__u8 onboard;
+	__u8 offset;		/* Bit offset from frame sync to time slot 1 */
+	volatile __u32 status;
+	volatile __u32 version;
+	__u8 precision;		/* In bits, either 8 or 16 */
+	__u8 channels;		/* 1 or 2 */
+};
+
+/*
+ * Control mode first 
+ */
+
+/* Time Slot 1, Status register */
+#define CS4215_CLB	(1<<2)	/* Control Latch Bit */
+#define CS4215_OLB	(1<<3)	/* 1: line: 2.0V, speaker 4V */
+				/* 0: line: 2.8V, speaker 8V */
+#define CS4215_MLB	(1<<4)	/* 1: Microphone: 20dB gain disabled */
+#define CS4215_RSRVD_1  (1<<5)
+
+/* Time Slot 2, Data Format Register */
+#define CS4215_DFR_LINEAR16	0
+#define CS4215_DFR_ULAW		1
+#define CS4215_DFR_ALAW		2
+#define CS4215_DFR_LINEAR8	3
+#define CS4215_DFR_STEREO	(1<<2)
+static struct {
+	unsigned short freq;
+	unsigned char xtal;
+	unsigned char csval;
+} CS4215_FREQ[] = {
+	{  8000, (1 << 4), (0 << 3) },
+	{ 16000, (1 << 4), (1 << 3) },
+	{ 27429, (1 << 4), (2 << 3) },	/* Actually 24428.57 */
+	{ 32000, (1 << 4), (3 << 3) },
+     /* {    NA, (1 << 4), (4 << 3) }, */
+     /* {    NA, (1 << 4), (5 << 3) }, */
+	{ 48000, (1 << 4), (6 << 3) },
+	{  9600, (1 << 4), (7 << 3) },
+	{  5513, (2 << 4), (0 << 3) },	/* Actually 5512.5 */
+	{ 11025, (2 << 4), (1 << 3) },
+	{ 18900, (2 << 4), (2 << 3) },
+	{ 22050, (2 << 4), (3 << 3) },
+	{ 37800, (2 << 4), (4 << 3) },
+	{ 44100, (2 << 4), (5 << 3) },
+	{ 33075, (2 << 4), (6 << 3) },
+	{  6615, (2 << 4), (7 << 3) },
+	{ 0, 0, 0}
+};
+
+#define CS4215_HPF	(1<<7)	/* High Pass Filter, 1: Enabled */
+
+#define CS4215_12_MASK	0xfcbf	/* Mask off reserved bits in slot 1 & 2 */
+
+/* Time Slot 3, Serial Port Control register */
+#define CS4215_XEN	(1<<0)	/* 0: Enable serial output */
+#define CS4215_XCLK	(1<<1)	/* 1: Master mode: Generate SCLK */
+#define CS4215_BSEL_64	(0<<2)	/* Bitrate: 64 bits per frame */
+#define CS4215_BSEL_128	(1<<2)
+#define CS4215_BSEL_256	(2<<2)
+#define CS4215_MCK_MAST (0<<4)	/* Master clock */
+#define CS4215_MCK_XTL1 (1<<4)	/* 24.576 MHz clock source */
+#define CS4215_MCK_XTL2 (2<<4)	/* 16.9344 MHz clock source */
+#define CS4215_MCK_CLK1 (3<<4)	/* Clockin, 256 x Fs */
+#define CS4215_MCK_CLK2 (4<<4)	/* Clockin, see DFR */
+
+/* Time Slot 4, Test Register */
+#define CS4215_DAD	(1<<0)	/* 0:Digital-Dig loop, 1:Dig-Analog-Dig loop */
+#define CS4215_ENL	(1<<1)	/* Enable Loopback Testing */
+
+/* Time Slot 5, Parallel Port Register */
+/* Read only here and the same as the in data mode */
+
+/* Time Slot 6, Reserved  */
+
+/* Time Slot 7, Version Register  */
+#define CS4215_VERSION_MASK 0xf	/* Known versions 0/C, 1/D, 2/E */
+
+/* Time Slot 8, Reserved  */
+
+/*
+ * Data mode
+ */
+/* Time Slot 1-2: Left Channel Data, 2-3: Right Channel Data  */
+
+/* Time Slot 5, Output Setting  */
+#define CS4215_LO(v)	v	/* Left Output Attenuation 0x3f: -94.5 dB */
+#define CS4215_LE	(1<<6)	/* Line Out Enable */
+#define CS4215_HE	(1<<7)	/* Headphone Enable */
+
+/* Time Slot 6, Output Setting  */
+#define CS4215_RO(v)	v	/* Right Output Attenuation 0x3f: -94.5 dB */
+#define CS4215_SE	(1<<6)	/* Speaker Enable */
+#define CS4215_ADI	(1<<7)	/* A/D Data Invalid: Busy in calibration */
+
+/* Time Slot 7, Input Setting */
+#define CS4215_LG(v)	v	/* Left Gain Setting 0xf: 22.5 dB */
+#define CS4215_IS	(1<<4)	/* Input Select: 1=Microphone, 0=Line */
+#define CS4215_OVR	(1<<5)	/* 1: Overrange condition occurred */
+#define CS4215_PIO0	(1<<6)	/* Parallel I/O 0 */
+#define CS4215_PIO1	(1<<7)
+
+/* Time Slot 8, Input Setting */
+#define CS4215_RG(v)	v	/* Right Gain Setting 0xf: 22.5 dB */
+#define CS4215_MA(v)	(v<<4)	/* Monitor Path Attenuation 0xf: mute */
+
+/***************************************************************************
+		DBRI specific definitions and structures
+****************************************************************************/
+
+/* DBRI main registers */
+#define REG0	0x00UL		/* Status and Control */
+#define REG1	0x04UL		/* Mode and Interrupt */
+#define REG2	0x08UL		/* Parallel IO */
+#define REG3	0x0cUL		/* Test */
+#define REG8	0x20UL		/* Command Queue Pointer */
+#define REG9	0x24UL		/* Interrupt Queue Pointer */
+
+#define DBRI_NO_CMDS	64
+#define DBRI_NO_INTS	1	/* Note: the value of this define was
+				 * originally 2.  The ringbuffer to store
+				 * interrupts in dma is currently broken.
+				 * This is a temporary fix until the ringbuffer
+				 * is fixed.
+				 */
+#define DBRI_INT_BLK	64
+#define DBRI_NO_DESCS	64
+#define DBRI_NO_PIPES	32
+
+#define DBRI_MM_ONB	1
+#define DBRI_MM_SB	2
+
+#define DBRI_REC	0
+#define DBRI_PLAY	1
+#define DBRI_NO_STREAMS	2
+
+/* One transmit/receive descriptor */
+struct dbri_mem {
+	volatile __u32 word1;
+	volatile __u32 ba;	/* Transmit/Receive Buffer Address */
+	volatile __u32 nda;	/* Next Descriptor Address */
+	volatile __u32 word4;
+};
+
+/* This structure is in a DMA region where it can accessed by both
+ * the CPU and the DBRI
+ */
+struct dbri_dma {
+	volatile s32 cmd[DBRI_NO_CMDS];	/* Place for commands       */
+	volatile s32 intr[DBRI_NO_INTS * DBRI_INT_BLK];	/* Interrupt field  */
+	struct dbri_mem desc[DBRI_NO_DESCS];	/* Xmit/receive descriptors */
+};
+
+#define dbri_dma_off(member, elem)	\
+	((u32)(unsigned long)		\
+	 (&(((struct dbri_dma *)0)->member[elem])))
+
+enum in_or_out { PIPEinput, PIPEoutput };
+
+struct dbri_pipe {
+	u32 sdp;		/* SDP command word */
+	enum in_or_out direction;
+	int nextpipe;		/* Next pipe in linked list */
+	int prevpipe;
+	int cycle;		/* Offset of timeslot (bits) */
+	int length;		/* Length of timeslot (bits) */
+	int first_desc;		/* Index of first descriptor */
+	int desc;		/* Index of active descriptor */
+	volatile __u32 *recv_fixed_ptr;	/* Ptr to receive fixed data */
+};
+
+struct dbri_desc {
+	int inuse;		/* Boolean flag */
+	int next;		/* Index of next desc, or -1 */
+	unsigned int len;
+};
+
+/* Per stream (playback or record) information */
+typedef struct dbri_streaminfo {
+	snd_pcm_substream_t *substream;
+	u32 dvma_buffer;	/* Device view of Alsa DMA buffer */
+	int left;		/* # of bytes left in DMA buffer  */
+	int size;		/* Size of DMA buffer             */
+	size_t offset;		/* offset in user buffer          */
+	int pipe;		/* Data pipe used                 */
+	int left_gain;		/* mixer elements                 */
+	int right_gain;
+	int balance;
+} dbri_streaminfo_t;
+
+/* This structure holds the information for both chips (DBRI & CS4215) */
+typedef struct snd_dbri {
+	snd_card_t *card;	/* ALSA card */
+	snd_pcm_t *pcm;
+
+	int regs_size, irq;	/* Needed for unload */
+	struct sbus_dev *sdev;	/* SBUS device info */
+	spinlock_t lock;
+
+	volatile struct dbri_dma *dma;	/* Pointer to our DMA block */
+	u32 dma_dvma;		/* DBRI visible DMA address */
+
+	void __iomem *regs;	/* dbri HW regs */
+	int dbri_version;	/* 'e' and up is OK */
+	int dbri_irqp;		/* intr queue pointer */
+	int wait_seen;
+
+	struct dbri_pipe pipes[DBRI_NO_PIPES];	/* DBRI's 32 data pipes */
+	struct dbri_desc descs[DBRI_NO_DESCS];
+
+	int chi_in_pipe;
+	int chi_out_pipe;
+	int chi_bpf;
+
+	struct cs4215 mm;	/* mmcodec special info */
+				/* per stream (playback/record) info */
+	struct dbri_streaminfo stream_info[DBRI_NO_STREAMS];
+
+	struct snd_dbri *next;
+} snd_dbri_t;
+
+/* Needed for the ALSA macros to work */
+#define chip_t snd_dbri_t
+
+#define DBRI_MAX_VOLUME		63	/* Output volume */
+#define DBRI_MAX_GAIN		15	/* Input gain */
+#define DBRI_RIGHT_BALANCE	255
+#define DBRI_MID_BALANCE	(DBRI_RIGHT_BALANCE >> 1)
+
+/* DBRI Reg0 - Status Control Register - defines. (Page 17) */
+#define D_P		(1<<15)	/* Program command & queue pointer valid */
+#define D_G		(1<<14)	/* Allow 4-Word SBus Burst */
+#define D_S		(1<<13)	/* Allow 16-Word SBus Burst */
+#define D_E		(1<<12)	/* Allow 8-Word SBus Burst */
+#define D_X		(1<<7)	/* Sanity Timer Disable */
+#define D_T		(1<<6)	/* Permit activation of the TE interface */
+#define D_N		(1<<5)	/* Permit activation of the NT interface */
+#define D_C		(1<<4)	/* Permit activation of the CHI interface */
+#define D_F		(1<<3)	/* Force Sanity Timer Time-Out */
+#define D_D		(1<<2)	/* Disable Master Mode */
+#define D_H		(1<<1)	/* Halt for Analysis */
+#define D_R		(1<<0)	/* Soft Reset */
+
+/* DBRI Reg1 - Mode and Interrupt Register - defines. (Page 18) */
+#define D_LITTLE_END	(1<<8)	/* Byte Order */
+#define D_BIG_END	(0<<8)	/* Byte Order */
+#define D_MRR		(1<<4)	/* Multiple Error Ack on SBus (readonly) */
+#define D_MLE		(1<<3)	/* Multiple Late Error on SBus (readonly) */
+#define D_LBG		(1<<2)	/* Lost Bus Grant on SBus (readonly) */
+#define D_MBE		(1<<1)	/* Burst Error on SBus (readonly) */
+#define D_IR		(1<<0)	/* Interrupt Indicator (readonly) */
+
+/* DBRI Reg2 - Parallel IO Register - defines. (Page 18) */
+#define D_ENPIO3	(1<<7)	/* Enable Pin 3 */
+#define D_ENPIO2	(1<<6)	/* Enable Pin 2 */
+#define D_ENPIO1	(1<<5)	/* Enable Pin 1 */
+#define D_ENPIO0	(1<<4)	/* Enable Pin 0 */
+#define D_ENPIO		(0xf0)	/* Enable all the pins */
+#define D_PIO3		(1<<3)	/* Pin 3: 1: Data mode, 0: Ctrl mode */
+#define D_PIO2		(1<<2)	/* Pin 2: 1: Onboard PDN */
+#define D_PIO1		(1<<1)	/* Pin 1: 0: Reset */
+#define D_PIO0		(1<<0)	/* Pin 0: 1: Speakerbox PDN */
+
+/* DBRI Commands (Page 20) */
+#define D_WAIT		0x0	/* Stop execution */
+#define D_PAUSE		0x1	/* Flush long pipes */
+#define D_JUMP		0x2	/* New command queue */
+#define D_IIQ		0x3	/* Initialize Interrupt Queue */
+#define D_REX		0x4	/* Report command execution via interrupt */
+#define D_SDP		0x5	/* Setup Data Pipe */
+#define D_CDP		0x6	/* Continue Data Pipe (reread NULL Pointer) */
+#define D_DTS		0x7	/* Define Time Slot */
+#define D_SSP		0x8	/* Set short Data Pipe */
+#define D_CHI		0x9	/* Set CHI Global Mode */
+#define D_NT		0xa	/* NT Command */
+#define D_TE		0xb	/* TE Command */
+#define D_CDEC		0xc	/* Codec setup */
+#define D_TEST		0xd	/* No comment */
+#define D_CDM		0xe	/* CHI Data mode command */
+
+/* Special bits for some commands */
+#define D_PIPE(v)      ((v)<<0)	/* Pipe Nr: 0-15 long, 16-21 short */
+
+/* Setup Data Pipe */
+/* IRM */
+#define D_SDP_2SAME	(1<<18)	/* Report 2nd time in a row value rcvd */
+#define D_SDP_CHANGE	(2<<18)	/* Report any changes */
+#define D_SDP_EVERY	(3<<18)	/* Report any changes */
+#define D_SDP_EOL	(1<<17)	/* EOL interrupt enable */
+#define D_SDP_IDLE	(1<<16)	/* HDLC idle interrupt enable */
+
+/* Pipe data MODE */
+#define D_SDP_MEM	(0<<13)	/* To/from memory */
+#define D_SDP_HDLC	(2<<13)
+#define D_SDP_HDLC_D	(3<<13)	/* D Channel (prio control) */
+#define D_SDP_SER	(4<<13)	/* Serial to serial */
+#define D_SDP_FIXED	(6<<13)	/* Short only */
+#define D_SDP_MODE(v)	((v)&(7<<13))
+
+#define D_SDP_TO_SER	(1<<12)	/* Direction */
+#define D_SDP_FROM_SER	(0<<12)	/* Direction */
+#define D_SDP_MSB	(1<<11)	/* Bit order within Byte */
+#define D_SDP_LSB	(0<<11)	/* Bit order within Byte */
+#define D_SDP_P		(1<<10)	/* Pointer Valid */
+#define D_SDP_A		(1<<8)	/* Abort */
+#define D_SDP_C		(1<<7)	/* Clear */
+
+/* Define Time Slot */
+#define D_DTS_VI	(1<<17)	/* Valid Input Time-Slot Descriptor */
+#define D_DTS_VO	(1<<16)	/* Valid Output Time-Slot Descriptor */
+#define D_DTS_INS	(1<<15)	/* Insert Time Slot */
+#define D_DTS_DEL	(0<<15)	/* Delete Time Slot */
+#define D_DTS_PRVIN(v) ((v)<<10)	/* Previous In Pipe */
+#define D_DTS_PRVOUT(v)        ((v)<<5)	/* Previous Out Pipe */
+
+/* Time Slot defines */
+#define D_TS_LEN(v)	((v)<<24)	/* Number of bits in this time slot */
+#define D_TS_CYCLE(v)	((v)<<14)	/* Bit Count at start of TS */
+#define D_TS_DI		(1<<13)	/* Data Invert */
+#define D_TS_1CHANNEL	(0<<10)	/* Single Channel / Normal mode */
+#define D_TS_MONITOR	(2<<10)	/* Monitor pipe */
+#define D_TS_NONCONTIG	(3<<10)	/* Non contiguous mode */
+#define D_TS_ANCHOR	(7<<10)	/* Starting short pipes */
+#define D_TS_MON(v)    ((v)<<5)	/* Monitor Pipe */
+#define D_TS_NEXT(v)   ((v)<<0)	/* Pipe Nr: 0-15 long, 16-21 short */
+
+/* Concentration Highway Interface Modes */
+#define D_CHI_CHICM(v)	((v)<<16)	/* Clock mode */
+#define D_CHI_IR	(1<<15)	/* Immediate Interrupt Report */
+#define D_CHI_EN	(1<<14)	/* CHIL Interrupt enabled */
+#define D_CHI_OD	(1<<13)	/* Open Drain Enable */
+#define D_CHI_FE	(1<<12)	/* Sample CHIFS on Rising Frame Edge */
+#define D_CHI_FD	(1<<11)	/* Frame Drive */
+#define D_CHI_BPF(v)	((v)<<0)	/* Bits per Frame */
+
+/* NT: These are here for completeness */
+#define D_NT_FBIT	(1<<17)	/* Frame Bit */
+#define D_NT_NBF	(1<<16)	/* Number of bad frames to loose framing */
+#define D_NT_IRM_IMM	(1<<15)	/* Interrupt Report & Mask: Immediate */
+#define D_NT_IRM_EN	(1<<14)	/* Interrupt Report & Mask: Enable */
+#define D_NT_ISNT	(1<<13)	/* Configfure interface as NT */
+#define D_NT_FT		(1<<12)	/* Fixed Timing */
+#define D_NT_EZ		(1<<11)	/* Echo Channel is Zeros */
+#define D_NT_IFA	(1<<10)	/* Inhibit Final Activation */
+#define D_NT_ACT	(1<<9)	/* Activate Interface */
+#define D_NT_MFE	(1<<8)	/* Multiframe Enable */
+#define D_NT_RLB(v)	((v)<<5)	/* Remote Loopback */
+#define D_NT_LLB(v)	((v)<<2)	/* Local Loopback */
+#define D_NT_FACT	(1<<1)	/* Force Activation */
+#define D_NT_ABV	(1<<0)	/* Activate Bipolar Violation */
+
+/* Codec Setup */
+#define D_CDEC_CK(v)	((v)<<24)	/* Clock Select */
+#define D_CDEC_FED(v)	((v)<<12)	/* FSCOD Falling Edge Delay */
+#define D_CDEC_RED(v)	((v)<<0)	/* FSCOD Rising Edge Delay */
+
+/* Test */
+#define D_TEST_RAM(v)	((v)<<16)	/* RAM Pointer */
+#define D_TEST_SIZE(v)	((v)<<11)	/* */
+#define D_TEST_ROMONOFF	0x5	/* Toggle ROM opcode monitor on/off */
+#define D_TEST_PROC	0x6	/* MicroProcessor test */
+#define D_TEST_SER	0x7	/* Serial-Controller test */
+#define D_TEST_RAMREAD	0x8	/* Copy from Ram to system memory */
+#define D_TEST_RAMWRITE	0x9	/* Copy into Ram from system memory */
+#define D_TEST_RAMBIST	0xa	/* RAM Built-In Self Test */
+#define D_TEST_MCBIST	0xb	/* Microcontroller Built-In Self Test */
+#define D_TEST_DUMP	0xe	/* ROM Dump */
+
+/* CHI Data Mode */
+#define D_CDM_THI	(1<<8)	/* Transmit Data on CHIDR Pin */
+#define D_CDM_RHI	(1<<7)	/* Receive Data on CHIDX Pin */
+#define D_CDM_RCE	(1<<6)	/* Receive on Rising Edge of CHICK */
+#define D_CDM_XCE	(1<<2)	/* Transmit Data on Rising Edge of CHICK */
+#define D_CDM_XEN	(1<<1)	/* Transmit Highway Enable */
+#define D_CDM_REN	(1<<0)	/* Receive Highway Enable */
+
+/* The Interrupts */
+#define D_INTR_BRDY	1	/* Buffer Ready for processing */
+#define D_INTR_MINT	2	/* Marked Interrupt in RD/TD */
+#define D_INTR_IBEG	3	/* Flag to idle transition detected (HDLC) */
+#define D_INTR_IEND	4	/* Idle to flag transition detected (HDLC) */
+#define D_INTR_EOL	5	/* End of List */
+#define D_INTR_CMDI	6	/* Command has bean read */
+#define D_INTR_XCMP	8	/* Transmission of frame complete */
+#define D_INTR_SBRI	9	/* BRI status change info */
+#define D_INTR_FXDT	10	/* Fixed data change */
+#define D_INTR_CHIL	11	/* CHI lost frame sync (channel 36 only) */
+#define D_INTR_COLL	11	/* Unrecoverable D-Channel collision */
+#define D_INTR_DBYT	12	/* Dropped by frame slip */
+#define D_INTR_RBYT	13	/* Repeated by frame slip */
+#define D_INTR_LINT	14	/* Lost Interrupt */
+#define D_INTR_UNDR	15	/* DMA underrun */
+
+#define D_INTR_TE	32
+#define D_INTR_NT	34
+#define D_INTR_CHI	36
+#define D_INTR_CMD	38
+
+#define D_INTR_GETCHAN(v)	(((v)>>24) & 0x3f)
+#define D_INTR_GETCODE(v)	(((v)>>20) & 0xf)
+#define D_INTR_GETCMD(v)	(((v)>>16) & 0xf)
+#define D_INTR_GETVAL(v)	((v) & 0xffff)
+#define D_INTR_GETRVAL(v)	((v) & 0xfffff)
+
+#define D_P_0		0	/* TE receive anchor */
+#define D_P_1		1	/* TE transmit anchor */
+#define D_P_2		2	/* NT transmit anchor */
+#define D_P_3		3	/* NT receive anchor */
+#define D_P_4		4	/* CHI send data */
+#define D_P_5		5	/* CHI receive data */
+#define D_P_6		6	/* */
+#define D_P_7		7	/* */
+#define D_P_8		8	/* */
+#define D_P_9		9	/* */
+#define D_P_10		10	/* */
+#define D_P_11		11	/* */
+#define D_P_12		12	/* */
+#define D_P_13		13	/* */
+#define D_P_14		14	/* */
+#define D_P_15		15	/* */
+#define D_P_16		16	/* CHI anchor pipe */
+#define D_P_17		17	/* CHI send */
+#define D_P_18		18	/* CHI receive */
+#define D_P_19		19	/* CHI receive */
+#define D_P_20		20	/* CHI receive */
+#define D_P_21		21	/* */
+#define D_P_22		22	/* */
+#define D_P_23		23	/* */
+#define D_P_24		24	/* */
+#define D_P_25		25	/* */
+#define D_P_26		26	/* */
+#define D_P_27		27	/* */
+#define D_P_28		28	/* */
+#define D_P_29		29	/* */
+#define D_P_30		30	/* */
+#define D_P_31		31	/* */
+
+/* Transmit descriptor defines */
+#define DBRI_TD_F	(1<<31)	/* End of Frame */
+#define DBRI_TD_D	(1<<30)	/* Do not append CRC */
+#define DBRI_TD_CNT(v)	((v)<<16)	/* Number of valid bytes in the buffer */
+#define DBRI_TD_B	(1<<15)	/* Final interrupt */
+#define DBRI_TD_M	(1<<14)	/* Marker interrupt */
+#define DBRI_TD_I	(1<<13)	/* Transmit Idle Characters */
+#define DBRI_TD_FCNT(v)	(v)	/* Flag Count */
+#define DBRI_TD_UNR	(1<<3)	/* Underrun: transmitter is out of data */
+#define DBRI_TD_ABT	(1<<2)	/* Abort: frame aborted */
+#define DBRI_TD_TBC	(1<<0)	/* Transmit buffer Complete */
+#define DBRI_TD_STATUS(v)       ((v)&0xff)	/* Transmit status */
+			/* Maximum buffer size per TD: almost 8Kb */
+#define DBRI_TD_MAXCNT	((1 << 13) - 1)
+
+/* Receive descriptor defines */
+#define DBRI_RD_F	(1<<31)	/* End of Frame */
+#define DBRI_RD_C	(1<<30)	/* Completed buffer */
+#define DBRI_RD_B	(1<<15)	/* Final interrupt */
+#define DBRI_RD_M	(1<<14)	/* Marker interrupt */
+#define DBRI_RD_BCNT(v)	(v)	/* Buffer size */
+#define DBRI_RD_CRC	(1<<7)	/* 0: CRC is correct */
+#define DBRI_RD_BBC	(1<<6)	/* 1: Bad Byte received */
+#define DBRI_RD_ABT	(1<<5)	/* Abort: frame aborted */
+#define DBRI_RD_OVRN	(1<<3)	/* Overrun: data lost */
+#define DBRI_RD_STATUS(v)      ((v)&0xff)	/* Receive status */
+#define DBRI_RD_CNT(v) (((v)>>16)&0x1fff)	/* Valid bytes in the buffer */
+
+/* stream_info[] access */
+/* Translate the ALSA direction into the array index */
+#define DBRI_STREAMNO(substream)				\
+		(substream->stream == 				\
+		 SNDRV_PCM_STREAM_PLAYBACK? DBRI_PLAY: DBRI_REC)
+
+/* Return a pointer to dbri_streaminfo */
+#define DBRI_STREAM(dbri, substream)	&dbri->stream_info[DBRI_STREAMNO(substream)]
+
+static snd_dbri_t *dbri_list = NULL;	/* All DBRI devices */
+
+/*
+ * Short data pipes transmit LSB first. The CS4215 receives MSB first. Grrr.
+ * So we have to reverse the bits. Note: not all bit lengths are supported
+ */
+static __u32 reverse_bytes(__u32 b, int len)
+{
+	switch (len) {
+	case 32:
+		b = ((b & 0xffff0000) >> 16) | ((b & 0x0000ffff) << 16);
+	case 16:
+		b = ((b & 0xff00ff00) >> 8) | ((b & 0x00ff00ff) << 8);
+	case 8:
+		b = ((b & 0xf0f0f0f0) >> 4) | ((b & 0x0f0f0f0f) << 4);
+	case 4:
+		b = ((b & 0xcccccccc) >> 2) | ((b & 0x33333333) << 2);
+	case 2:
+		b = ((b & 0xaaaaaaaa) >> 1) | ((b & 0x55555555) << 1);
+	case 1:
+	case 0:
+		break;
+	default:
+		printk(KERN_ERR "DBRI reverse_bytes: unsupported length\n");
+	};
+
+	return b;
+}
+
+/*
+****************************************************************************
+************** DBRI initialization and command synchronization *************
+****************************************************************************
+
+Commands are sent to the DBRI by building a list of them in memory,
+then writing the address of the first list item to DBRI register 8.
+The list is terminated with a WAIT command, which can generate a
+CPU interrupt if required.
+
+Since the DBRI can run in parallel with the CPU, several means of
+synchronization present themselves.  The original scheme (Rudolf's)
+was to set a flag when we "cmdlock"ed the DBRI, clear the flag when
+an interrupt signaled completion, and wait on a wait_queue if a routine
+attempted to cmdlock while the flag was set.  The problems arose when
+we tried to cmdlock from inside an interrupt handler, which might
+cause scheduling in an interrupt (if we waited), etc, etc
+
+A more sophisticated scheme might involve a circular command buffer
+or an array of command buffers.  A routine could fill one with
+commands and link it onto a list.  When a interrupt signaled
+completion of the current command buffer, look on the list for
+the next one.
+
+I've decided to implement something much simpler - after each command,
+the CPU waits for the DBRI to finish the command by polling the P bit
+in DBRI register 0.  I've tried to implement this in such a way
+that might make implementing a more sophisticated scheme easier.
+
+Every time a routine wants to write commands to the DBRI, it must
+first call dbri_cmdlock() and get an initial pointer into dbri->dma->cmd
+in return.  After the commands have been writen, dbri_cmdsend() is
+called with the final pointer value.
+
+*/
+
+enum dbri_lock_t { NoGetLock, GetLock };
+
+static volatile s32 *dbri_cmdlock(snd_dbri_t * dbri, enum dbri_lock_t get)
+{
+#ifndef SMP
+	if ((get == GetLock) && spin_is_locked(&dbri->lock)) {
+		printk(KERN_ERR "DBRI: cmdlock called while in spinlock.");
+	}
+#endif
+
+	/*if (get == GetLock) spin_lock(&dbri->lock); */
+	return &dbri->dma->cmd[0];
+}
+
+static void dbri_process_interrupt_buffer(snd_dbri_t *);
+
+static void dbri_cmdsend(snd_dbri_t * dbri, volatile s32 * cmd)
+{
+	int MAXLOOPS = 1000000;
+	int maxloops = MAXLOOPS;
+	volatile s32 *ptr;
+
+	for (ptr = &dbri->dma->cmd[0]; ptr < cmd; ptr++) {
+		dprintk(D_CMD, "cmd: %lx:%08x\n", (unsigned long)ptr, *ptr);
+	}
+
+	if ((cmd - &dbri->dma->cmd[0]) >= DBRI_NO_CMDS - 1) {
+		printk("DBRI: Command buffer overflow! (bug in driver)\n");
+		/* Ignore the last part. */
+		cmd = &dbri->dma->cmd[DBRI_NO_CMDS - 3];
+	}
+
+	*(cmd++) = DBRI_CMD(D_PAUSE, 0, 0);
+	*(cmd++) = DBRI_CMD(D_WAIT, 1, 0);
+	dbri->wait_seen = 0;
+	sbus_writel(dbri->dma_dvma, dbri->regs + REG8);
+	while ((--maxloops) > 0 && (sbus_readl(dbri->regs + REG0) & D_P))
+		barrier();
+	if (maxloops == 0) {
+		printk(KERN_ERR "DBRI: Chip never completed command buffer\n");
+		dprintk(D_CMD, "DBRI: Chip never completed command buffer\n");
+	} else {
+		while ((--maxloops) > 0 && (!dbri->wait_seen))
+			dbri_process_interrupt_buffer(dbri);
+		if (maxloops == 0) {
+			printk(KERN_ERR "DBRI: Chip never acked WAIT\n");
+			dprintk(D_CMD, "DBRI: Chip never acked WAIT\n");
+		} else {
+			dprintk(D_CMD, "Chip completed command "
+				"buffer (%d)\n", MAXLOOPS - maxloops);
+		}
+	}
+
+	/*spin_unlock(&dbri->lock); */
+}
+
+/* Lock must be held when calling this */
+static void dbri_reset(snd_dbri_t * dbri)
+{
+	int i;
+
+	dprintk(D_GEN, "reset 0:%x 2:%x 8:%x 9:%x\n",
+		sbus_readl(dbri->regs + REG0),
+		sbus_readl(dbri->regs + REG2),
+		sbus_readl(dbri->regs + REG8), sbus_readl(dbri->regs + REG9));
+
+	sbus_writel(D_R, dbri->regs + REG0);	/* Soft Reset */
+	for (i = 0; (sbus_readl(dbri->regs + REG0) & D_R) && i < 64; i++)
+		udelay(10);
+}
+
+/* Lock must not be held before calling this */
+static void dbri_initialize(snd_dbri_t * dbri)
+{
+	volatile s32 *cmd;
+	u32 dma_addr, tmp;
+	unsigned long flags;
+	int n;
+
+	spin_lock_irqsave(&dbri->lock, flags);
+
+	dbri_reset(dbri);
+
+	cmd = dbri_cmdlock(dbri, NoGetLock);
+	dprintk(D_GEN, "init: cmd: %p, int: %p\n",
+		&dbri->dma->cmd[0], &dbri->dma->intr[0]);
+
+	/*
+	 * Initialize the interrupt ringbuffer.
+	 */
+	for (n = 0; n < DBRI_NO_INTS - 1; n++) {
+		dma_addr = dbri->dma_dvma;
+		dma_addr += dbri_dma_off(intr, ((n + 1) & DBRI_INT_BLK));
+		dbri->dma->intr[n * DBRI_INT_BLK] = dma_addr;
+	}
+	dma_addr = dbri->dma_dvma + dbri_dma_off(intr, 0);
+	dbri->dma->intr[n * DBRI_INT_BLK] = dma_addr;
+	dbri->dbri_irqp = 1;
+
+	/* Initialize pipes */
+	for (n = 0; n < DBRI_NO_PIPES; n++)
+		dbri->pipes[n].desc = dbri->pipes[n].first_desc = -1;
+
+	/* We should query the openprom to see what burst sizes this
+	 * SBus supports.  For now, just disable all SBus bursts */
+	tmp = sbus_readl(dbri->regs + REG0);
+	tmp &= ~(D_G | D_S | D_E);
+	sbus_writel(tmp, dbri->regs + REG0);
+
+	/*
+	 * Set up the interrupt queue
+	 */
+	dma_addr = dbri->dma_dvma + dbri_dma_off(intr, 0);
+	*(cmd++) = DBRI_CMD(D_IIQ, 0, 0);
+	*(cmd++) = dma_addr;
+
+	dbri_cmdsend(dbri, cmd);
+	spin_unlock_irqrestore(&dbri->lock, flags);
+}
+
+/*
+****************************************************************************
+************************** DBRI data pipe management ***********************
+****************************************************************************
+
+While DBRI control functions use the command and interrupt buffers, the
+main data path takes the form of data pipes, which can be short (command
+and interrupt driven), or long (attached to DMA buffers).  These functions
+provide a rudimentary means of setting up and managing the DBRI's pipes,
+but the calling functions have to make sure they respect the pipes' linked
+list ordering, among other things.  The transmit and receive functions
+here interface closely with the transmit and receive interrupt code.
+
+*/
+static int pipe_active(snd_dbri_t * dbri, int pipe)
+{
+	return ((pipe >= 0) && (dbri->pipes[pipe].desc != -1));
+}
+
+/* reset_pipe(dbri, pipe)
+ *
+ * Called on an in-use pipe to clear anything being transmitted or received
+ * Lock must be held before calling this.
+ */
+static void reset_pipe(snd_dbri_t * dbri, int pipe)
+{
+	int sdp;
+	int desc;
+	volatile int *cmd;
+
+	if (pipe < 0 || pipe > 31) {
+		printk("DBRI: reset_pipe called with illegal pipe number\n");
+		return;
+	}
+
+	sdp = dbri->pipes[pipe].sdp;
+	if (sdp == 0) {
+		printk("DBRI: reset_pipe called on uninitialized pipe\n");
+		return;
+	}
+
+	cmd = dbri_cmdlock(dbri, NoGetLock);
+	*(cmd++) = DBRI_CMD(D_SDP, 0, sdp | D_SDP_C | D_SDP_P);
+	*(cmd++) = 0;
+	dbri_cmdsend(dbri, cmd);
+
+	desc = dbri->pipes[pipe].first_desc;
+	while (desc != -1) {
+		dbri->descs[desc].inuse = 0;
+		desc = dbri->descs[desc].next;
+	}
+
+	dbri->pipes[pipe].desc = -1;
+	dbri->pipes[pipe].first_desc = -1;
+}
+
+/* FIXME: direction as an argument? */
+static void setup_pipe(snd_dbri_t * dbri, int pipe, int sdp)
+{
+	if (pipe < 0 || pipe > 31) {
+		printk("DBRI: setup_pipe called with illegal pipe number\n");
+		return;
+	}
+
+	if ((sdp & 0xf800) != sdp) {
+		printk("DBRI: setup_pipe called with strange SDP value\n");
+		/* sdp &= 0xf800; */
+	}
+
+	/* If this is a fixed receive pipe, arrange for an interrupt
+	 * every time its data changes
+	 */
+	if (D_SDP_MODE(sdp) == D_SDP_FIXED && !(sdp & D_SDP_TO_SER))
+		sdp |= D_SDP_CHANGE;
+
+	sdp |= D_PIPE(pipe);
+	dbri->pipes[pipe].sdp = sdp;
+	dbri->pipes[pipe].desc = -1;
+	dbri->pipes[pipe].first_desc = -1;
+	if (sdp & D_SDP_TO_SER)
+		dbri->pipes[pipe].direction = PIPEoutput;
+	else
+		dbri->pipes[pipe].direction = PIPEinput;
+
+	reset_pipe(dbri, pipe);
+}
+
+/* FIXME: direction not needed */
+static void link_time_slot(snd_dbri_t * dbri, int pipe,
+			   enum in_or_out direction, int basepipe,
+			   int length, int cycle)
+{
+	volatile s32 *cmd;
+	int val;
+	int prevpipe;
+	int nextpipe;
+
+	if (pipe < 0 || pipe > 31 || basepipe < 0 || basepipe > 31) {
+		printk
+		    ("DBRI: link_time_slot called with illegal pipe number\n");
+		return;
+	}
+
+	if (dbri->pipes[pipe].sdp == 0 || dbri->pipes[basepipe].sdp == 0) {
+		printk("DBRI: link_time_slot called on uninitialized pipe\n");
+		return;
+	}
+
+	/* Deal with CHI special case:
+	 * "If transmission on edges 0 or 1 is desired, then cycle n
+	 *  (where n = # of bit times per frame...) must be used."
+	 *                  - DBRI data sheet, page 11
+	 */
+	if (basepipe == 16 && direction == PIPEoutput && cycle == 0)
+		cycle = dbri->chi_bpf;
+
+	if (basepipe == pipe) {
+		prevpipe = pipe;
+		nextpipe = pipe;
+	} else {
+		/* We're not initializing a new linked list (basepipe != pipe),
+		 * so run through the linked list and find where this pipe
+		 * should be sloted in, based on its cycle.  CHI confuses
+		 * things a bit, since it has a single anchor for both its
+		 * transmit and receive lists.
+		 */
+		if (basepipe == 16) {
+			if (direction == PIPEinput) {
+				prevpipe = dbri->chi_in_pipe;
+			} else {
+				prevpipe = dbri->chi_out_pipe;
+			}
+		} else {
+			prevpipe = basepipe;
+		}
+
+		nextpipe = dbri->pipes[prevpipe].nextpipe;
+
+		while (dbri->pipes[nextpipe].cycle < cycle
+		       && dbri->pipes[nextpipe].nextpipe != basepipe) {
+			prevpipe = nextpipe;
+			nextpipe = dbri->pipes[nextpipe].nextpipe;
+		}
+	}
+
+	if (prevpipe == 16) {
+		if (direction == PIPEinput) {
+			dbri->chi_in_pipe = pipe;
+		} else {
+			dbri->chi_out_pipe = pipe;
+		}
+	} else {
+		dbri->pipes[prevpipe].nextpipe = pipe;
+	}
+
+	dbri->pipes[pipe].nextpipe = nextpipe;
+	dbri->pipes[pipe].cycle = cycle;
+	dbri->pipes[pipe].length = length;
+
+	cmd = dbri_cmdlock(dbri, NoGetLock);
+
+	if (direction == PIPEinput) {
+		val = D_DTS_VI | D_DTS_INS | D_DTS_PRVIN(prevpipe) | pipe;
+		*(cmd++) = DBRI_CMD(D_DTS, 0, val);
+		*(cmd++) =
+		    D_TS_LEN(length) | D_TS_CYCLE(cycle) | D_TS_NEXT(nextpipe);
+		*(cmd++) = 0;
+	} else {
+		val = D_DTS_VO | D_DTS_INS | D_DTS_PRVOUT(prevpipe) | pipe;
+		*(cmd++) = DBRI_CMD(D_DTS, 0, val);
+		*(cmd++) = 0;
+		*(cmd++) =
+		    D_TS_LEN(length) | D_TS_CYCLE(cycle) | D_TS_NEXT(nextpipe);
+	}
+
+	dbri_cmdsend(dbri, cmd);
+}
+
+static void unlink_time_slot(snd_dbri_t * dbri, int pipe,
+			     enum in_or_out direction, int prevpipe,
+			     int nextpipe)
+{
+	volatile s32 *cmd;
+	int val;
+
+	if (pipe < 0 || pipe > 31 || prevpipe < 0 || prevpipe > 31) {
+		printk
+		    ("DBRI: unlink_time_slot called with illegal pipe number\n");
+		return;
+	}
+
+	cmd = dbri_cmdlock(dbri, NoGetLock);
+
+	if (direction == PIPEinput) {
+		val = D_DTS_VI | D_DTS_DEL | D_DTS_PRVIN(prevpipe) | pipe;
+		*(cmd++) = DBRI_CMD(D_DTS, 0, val);
+		*(cmd++) = D_TS_NEXT(nextpipe);
+		*(cmd++) = 0;
+	} else {
+		val = D_DTS_VO | D_DTS_DEL | D_DTS_PRVOUT(prevpipe) | pipe;
+		*(cmd++) = DBRI_CMD(D_DTS, 0, val);
+		*(cmd++) = 0;
+		*(cmd++) = D_TS_NEXT(nextpipe);
+	}
+
+	dbri_cmdsend(dbri, cmd);
+}
+
+/* xmit_fixed() / recv_fixed()
+ *
+ * Transmit/receive data on a "fixed" pipe - i.e, one whose contents are not
+ * expected to change much, and which we don't need to buffer.
+ * The DBRI only interrupts us when the data changes (receive pipes),
+ * or only changes the data when this function is called (transmit pipes).
+ * Only short pipes (numbers 16-31) can be used in fixed data mode.
+ *
+ * These function operate on a 32-bit field, no matter how large
+ * the actual time slot is.  The interrupt handler takes care of bit
+ * ordering and alignment.  An 8-bit time slot will always end up
+ * in the low-order 8 bits, filled either MSB-first or LSB-first,
+ * depending on the settings passed to setup_pipe()
+ */
+static void xmit_fixed(snd_dbri_t * dbri, int pipe, unsigned int data)
+{
+	volatile s32 *cmd;
+
+	if (pipe < 16 || pipe > 31) {
+		printk("DBRI: xmit_fixed: Illegal pipe number\n");
+		return;
+	}
+
+	if (D_SDP_MODE(dbri->pipes[pipe].sdp) == 0) {
+		printk("DBRI: xmit_fixed: Uninitialized pipe %d\n", pipe);
+		return;
+	}
+
+	if (D_SDP_MODE(dbri->pipes[pipe].sdp) != D_SDP_FIXED) {
+		printk("DBRI: xmit_fixed: Non-fixed pipe %d\n", pipe);
+		return;
+	}
+
+	if (!(dbri->pipes[pipe].sdp & D_SDP_TO_SER)) {
+		printk("DBRI: xmit_fixed: Called on receive pipe %d\n", pipe);
+		return;
+	}
+
+	/* DBRI short pipes always transmit LSB first */
+
+	if (dbri->pipes[pipe].sdp & D_SDP_MSB)
+		data = reverse_bytes(data, dbri->pipes[pipe].length);
+
+	cmd = dbri_cmdlock(dbri, GetLock);
+
+	*(cmd++) = DBRI_CMD(D_SSP, 0, pipe);
+	*(cmd++) = data;
+
+	dbri_cmdsend(dbri, cmd);
+}
+
+static void recv_fixed(snd_dbri_t * dbri, int pipe, volatile __u32 * ptr)
+{
+	if (pipe < 16 || pipe > 31) {
+		printk("DBRI: recv_fixed called with illegal pipe number\n");
+		return;
+	}
+
+	if (D_SDP_MODE(dbri->pipes[pipe].sdp) != D_SDP_FIXED) {
+		printk("DBRI: recv_fixed called on non-fixed pipe %d\n", pipe);
+		return;
+	}
+
+	if (dbri->pipes[pipe].sdp & D_SDP_TO_SER) {
+		printk("DBRI: recv_fixed called on transmit pipe %d\n", pipe);
+		return;
+	}
+
+	dbri->pipes[pipe].recv_fixed_ptr = ptr;
+}
+
+/* setup_descs()
+ *
+ * Setup transmit/receive data on a "long" pipe - i.e, one associated
+ * with a DMA buffer.
+ *
+ * Only pipe numbers 0-15 can be used in this mode.
+ *
+ * This function takes a stream number pointing to a data buffer,
+ * and work by building chains of descriptors which identify the
+ * data buffers.  Buffers too large for a single descriptor will
+ * be spread across multiple descriptors.
+ */
+static int setup_descs(snd_dbri_t * dbri, int streamno, unsigned int period)
+{
+	dbri_streaminfo_t *info = &dbri->stream_info[streamno];
+	__u32 dvma_buffer;
+	int desc = 0;
+	int len;
+	int first_desc = -1;
+	int last_desc = -1;
+
+	if (info->pipe < 0 || info->pipe > 15) {
+		printk("DBRI: setup_descs: Illegal pipe number\n");
+		return -2;
+	}
+
+	if (dbri->pipes[info->pipe].sdp == 0) {
+		printk("DBRI: setup_descs: Uninitialized pipe %d\n",
+		       info->pipe);
+		return -2;
+	}
+
+	dvma_buffer = info->dvma_buffer;
+	len = info->size;
+
+	if (streamno == DBRI_PLAY) {
+		if (!(dbri->pipes[info->pipe].sdp & D_SDP_TO_SER)) {
+			printk("DBRI: setup_descs: Called on receive pipe %d\n",
+			       info->pipe);
+			return -2;
+		}
+	} else {
+		if (dbri->pipes[info->pipe].sdp & D_SDP_TO_SER) {
+			printk
+			    ("DBRI: setup_descs: Called on transmit pipe %d\n",
+			     info->pipe);
+			return -2;
+		}
+		/* Should be able to queue multiple buffers to receive on a pipe */
+		if (pipe_active(dbri, info->pipe)) {
+			printk("DBRI: recv_on_pipe: Called on active pipe %d\n",
+			       info->pipe);
+			return -2;
+		}
+
+		/* Make sure buffer size is multiple of four */
+		len &= ~3;
+	}
+
+	while (len > 0) {
+		int mylen;
+
+		for (; desc < DBRI_NO_DESCS; desc++) {
+			if (!dbri->descs[desc].inuse)
+				break;
+		}
+		if (desc == DBRI_NO_DESCS) {
+			printk("DBRI: setup_descs: No descriptors\n");
+			return -1;
+		}
+
+		if (len > DBRI_TD_MAXCNT) {
+			mylen = DBRI_TD_MAXCNT;	/* 8KB - 1 */
+		} else {
+			mylen = len;
+		}
+		if (mylen > period) {
+			mylen = period;
+		}
+
+		dbri->descs[desc].inuse = 1;
+		dbri->descs[desc].next = -1;
+		dbri->dma->desc[desc].ba = dvma_buffer;
+		dbri->dma->desc[desc].nda = 0;
+
+		if (streamno == DBRI_PLAY) {
+			dbri->descs[desc].len = mylen;
+			dbri->dma->desc[desc].word1 = DBRI_TD_CNT(mylen);
+			dbri->dma->desc[desc].word4 = 0;
+			if (first_desc != -1)
+				dbri->dma->desc[desc].word1 |= DBRI_TD_M;
+		} else {
+			dbri->descs[desc].len = 0;
+			dbri->dma->desc[desc].word1 = 0;
+			dbri->dma->desc[desc].word4 =
+			    DBRI_RD_B | DBRI_RD_BCNT(mylen);
+		}
+
+		if (first_desc == -1) {
+			first_desc = desc;
+		} else {
+			dbri->descs[last_desc].next = desc;
+			dbri->dma->desc[last_desc].nda =
+			    dbri->dma_dvma + dbri_dma_off(desc, desc);
+		}
+
+		last_desc = desc;
+		dvma_buffer += mylen;
+		len -= mylen;
+	}
+
+	if (first_desc == -1 || last_desc == -1) {
+		printk("DBRI: setup_descs: Not enough descriptors available\n");
+		return -1;
+	}
+
+	dbri->dma->desc[last_desc].word1 &= ~DBRI_TD_M;
+	if (streamno == DBRI_PLAY) {
+		dbri->dma->desc[last_desc].word1 |=
+		    DBRI_TD_I | DBRI_TD_F | DBRI_TD_B;
+	}
+	dbri->pipes[info->pipe].first_desc = first_desc;
+	dbri->pipes[info->pipe].desc = first_desc;
+
+	for (desc = first_desc; desc != -1; desc = dbri->descs[desc].next) {
+		dprintk(D_DESC, "DESC %d: %08x %08x %08x %08x\n",
+			desc,
+			dbri->dma->desc[desc].word1,
+			dbri->dma->desc[desc].ba,
+			dbri->dma->desc[desc].nda, dbri->dma->desc[desc].word4);
+	}
+	return 0;
+}
+
+/*
+****************************************************************************
+************************** DBRI - CHI interface ****************************
+****************************************************************************
+
+The CHI is a four-wire (clock, frame sync, data in, data out) time-division
+multiplexed serial interface which the DBRI can operate in either master
+(give clock/frame sync) or slave (take clock/frame sync) mode.
+
+*/
+
+enum master_or_slave { CHImaster, CHIslave };
+
+static void reset_chi(snd_dbri_t * dbri, enum master_or_slave master_or_slave,
+		      int bits_per_frame)
+{
+	volatile s32 *cmd;
+	int val;
+	static int chi_initialized = 0;	/* FIXME: mutex? */
+
+	if (!chi_initialized) {
+
+		cmd = dbri_cmdlock(dbri, GetLock);
+
+		/* Set CHI Anchor: Pipe 16 */
+
+		val = D_DTS_VI | D_DTS_INS | D_DTS_PRVIN(16) | D_PIPE(16);
+		*(cmd++) = DBRI_CMD(D_DTS, 0, val);
+		*(cmd++) = D_TS_ANCHOR | D_TS_NEXT(16);
+		*(cmd++) = 0;
+
+		val = D_DTS_VO | D_DTS_INS | D_DTS_PRVOUT(16) | D_PIPE(16);
+		*(cmd++) = DBRI_CMD(D_DTS, 0, val);
+		*(cmd++) = 0;
+		*(cmd++) = D_TS_ANCHOR | D_TS_NEXT(16);
+
+		dbri->pipes[16].sdp = 1;
+		dbri->pipes[16].nextpipe = 16;
+		dbri->chi_in_pipe = 16;
+		dbri->chi_out_pipe = 16;
+
+#if 0
+		chi_initialized++;
+#endif
+	} else {
+		int pipe;
+
+		for (pipe = dbri->chi_in_pipe;
+		     pipe != 16; pipe = dbri->pipes[pipe].nextpipe) {
+			unlink_time_slot(dbri, pipe, PIPEinput,
+					 16, dbri->pipes[pipe].nextpipe);
+		}
+		for (pipe = dbri->chi_out_pipe;
+		     pipe != 16; pipe = dbri->pipes[pipe].nextpipe) {
+			unlink_time_slot(dbri, pipe, PIPEoutput,
+					 16, dbri->pipes[pipe].nextpipe);
+		}
+
+		dbri->chi_in_pipe = 16;
+		dbri->chi_out_pipe = 16;
+
+		cmd = dbri_cmdlock(dbri, GetLock);
+	}
+
+	if (master_or_slave == CHIslave) {
+		/* Setup DBRI for CHI Slave - receive clock, frame sync (FS)
+		 *
+		 * CHICM  = 0 (slave mode, 8 kHz frame rate)
+		 * IR     = give immediate CHI status interrupt
+		 * EN     = give CHI status interrupt upon change
+		 */
+		*(cmd++) = DBRI_CMD(D_CHI, 0, D_CHI_CHICM(0));
+	} else {
+		/* Setup DBRI for CHI Master - generate clock, FS
+		 *
+		 * BPF                          =  bits per 8 kHz frame
+		 * 12.288 MHz / CHICM_divisor   = clock rate
+		 * FD  =  1 - drive CHIFS on rising edge of CHICK
+		 */
+		int clockrate = bits_per_frame * 8;
+		int divisor = 12288 / clockrate;
+
+		if (divisor > 255 || divisor * clockrate != 12288)
+			printk("DBRI: illegal bits_per_frame in setup_chi\n");
+
+		*(cmd++) = DBRI_CMD(D_CHI, 0, D_CHI_CHICM(divisor) | D_CHI_FD
+				    | D_CHI_BPF(bits_per_frame));
+	}
+
+	dbri->chi_bpf = bits_per_frame;
+
+	/* CHI Data Mode
+	 *
+	 * RCE   =  0 - receive on falling edge of CHICK
+	 * XCE   =  1 - transmit on rising edge of CHICK
+	 * XEN   =  1 - enable transmitter
+	 * REN   =  1 - enable receiver
+	 */
+
+	*(cmd++) = DBRI_CMD(D_PAUSE, 0, 0);
+	*(cmd++) = DBRI_CMD(D_CDM, 0, D_CDM_XCE | D_CDM_XEN | D_CDM_REN);
+
+	dbri_cmdsend(dbri, cmd);
+}
+
+/*
+****************************************************************************
+*********************** CS4215 audio codec management **********************
+****************************************************************************
+
+In the standard SPARC audio configuration, the CS4215 codec is attached
+to the DBRI via the CHI interface and few of the DBRI's PIO pins.
+
+*/
+static void cs4215_setup_pipes(snd_dbri_t * dbri)
+{
+	/*
+	 * Data mode:
+	 * Pipe  4: Send timeslots 1-4 (audio data)
+	 * Pipe 20: Send timeslots 5-8 (part of ctrl data)
+	 * Pipe  6: Receive timeslots 1-4 (audio data)
+	 * Pipe 21: Receive timeslots 6-7. We can only receive 20 bits via
+	 *          interrupt, and the rest of the data (slot 5 and 8) is
+	 *          not relevant for us (only for doublechecking).
+	 *
+	 * Control mode:
+	 * Pipe 17: Send timeslots 1-4 (slots 5-8 are readonly)
+	 * Pipe 18: Receive timeslot 1 (clb).
+	 * Pipe 19: Receive timeslot 7 (version). 
+	 */
+
+	setup_pipe(dbri, 4, D_SDP_MEM | D_SDP_TO_SER | D_SDP_MSB);
+	setup_pipe(dbri, 20, D_SDP_FIXED | D_SDP_TO_SER | D_SDP_MSB);
+	setup_pipe(dbri, 6, D_SDP_MEM | D_SDP_FROM_SER | D_SDP_MSB);
+	setup_pipe(dbri, 21, D_SDP_FIXED | D_SDP_FROM_SER | D_SDP_MSB);
+
+	setup_pipe(dbri, 17, D_SDP_FIXED | D_SDP_TO_SER | D_SDP_MSB);
+	setup_pipe(dbri, 18, D_SDP_FIXED | D_SDP_FROM_SER | D_SDP_MSB);
+	setup_pipe(dbri, 19, D_SDP_FIXED | D_SDP_FROM_SER | D_SDP_MSB);
+}
+
+static int cs4215_init_data(struct cs4215 *mm)
+{
+	/*
+	 * No action, memory resetting only.
+	 *
+	 * Data Time Slot 5-8
+	 * Speaker,Line and Headphone enable. Gain set to the half.
+	 * Input is mike.
+	 */
+	mm->data[0] = CS4215_LO(0x20) | CS4215_HE | CS4215_LE;
+	mm->data[1] = CS4215_RO(0x20) | CS4215_SE;
+	mm->data[2] = CS4215_LG(0x8) | CS4215_IS | CS4215_PIO0 | CS4215_PIO1;
+	mm->data[3] = CS4215_RG(0x8) | CS4215_MA(0xf);
+
+	/*
+	 * Control Time Slot 1-4
+	 * 0: Default I/O voltage scale
+	 * 1: 8 bit ulaw, 8kHz, mono, high pass filter disabled
+	 * 2: Serial enable, CHI master, 128 bits per frame, clock 1
+	 * 3: Tests disabled
+	 */
+	mm->ctrl[0] = CS4215_RSRVD_1 | CS4215_MLB;
+	mm->ctrl[1] = CS4215_DFR_ULAW | CS4215_FREQ[0].csval;
+	mm->ctrl[2] = CS4215_XCLK | CS4215_BSEL_128 | CS4215_FREQ[0].xtal;
+	mm->ctrl[3] = 0;
+
+	mm->status = 0;
+	mm->version = 0xff;
+	mm->precision = 8;	/* For ULAW */
+	mm->channels = 2;
+
+	return 0;
+}
+
+static void cs4215_setdata(snd_dbri_t * dbri, int muted)
+{
+	if (muted) {
+		dbri->mm.data[0] |= 63;
+		dbri->mm.data[1] |= 63;
+		dbri->mm.data[2] &= ~15;
+		dbri->mm.data[3] &= ~15;
+	} else {
+		/* Start by setting the playback attenuation. */
+		dbri_streaminfo_t *info = &dbri->stream_info[DBRI_PLAY];
+		int left_gain = info->left_gain % 64;
+		int right_gain = info->right_gain % 64;
+
+		if (info->balance < DBRI_MID_BALANCE) {
+			right_gain *= info->balance;
+			right_gain /= DBRI_MID_BALANCE;
+		} else {
+			left_gain *= DBRI_RIGHT_BALANCE - info->balance;
+			left_gain /= DBRI_MID_BALANCE;
+		}
+
+		dbri->mm.data[0] &= ~0x3f;	/* Reset the volume bits */
+		dbri->mm.data[1] &= ~0x3f;
+		dbri->mm.data[0] |= (DBRI_MAX_VOLUME - left_gain);
+		dbri->mm.data[1] |= (DBRI_MAX_VOLUME - right_gain);
+
+		/* Now set the recording gain. */
+		info = &dbri->stream_info[DBRI_REC];
+		left_gain = info->left_gain % 16;
+		right_gain = info->right_gain % 16;
+		dbri->mm.data[2] |= CS4215_LG(left_gain);
+		dbri->mm.data[3] |= CS4215_RG(right_gain);
+	}
+
+	xmit_fixed(dbri, 20, *(int *)dbri->mm.data);
+}
+
+/*
+ * Set the CS4215 to data mode.
+ */
+static void cs4215_open(snd_dbri_t * dbri)
+{
+	int data_width;
+	u32 tmp;
+
+	dprintk(D_MM, "cs4215_open: %d channels, %d bits\n",
+		dbri->mm.channels, dbri->mm.precision);
+
+	/* Temporarily mute outputs, and wait 1/8000 sec (125 us)
+	 * to make sure this takes.  This avoids clicking noises.
+	 */
+
+	cs4215_setdata(dbri, 1);
+	udelay(125);
+
+	/*
+	 * Data mode:
+	 * Pipe  4: Send timeslots 1-4 (audio data)
+	 * Pipe 20: Send timeslots 5-8 (part of ctrl data)
+	 * Pipe  6: Receive timeslots 1-4 (audio data)
+	 * Pipe 21: Receive timeslots 6-7. We can only receive 20 bits via
+	 *          interrupt, and the rest of the data (slot 5 and 8) is
+	 *          not relevant for us (only for doublechecking).
+	 *
+	 * Just like in control mode, the time slots are all offset by eight
+	 * bits.  The CS4215, it seems, observes TSIN (the delayed signal)
+	 * even if it's the CHI master.  Don't ask me...
+	 */
+	tmp = sbus_readl(dbri->regs + REG0);
+	tmp &= ~(D_C);		/* Disable CHI */
+	sbus_writel(tmp, dbri->regs + REG0);
+
+	/* Switch CS4215 to data mode - set PIO3 to 1 */
+	sbus_writel(D_ENPIO | D_PIO1 | D_PIO3 |
+		    (dbri->mm.onboard ? D_PIO0 : D_PIO2), dbri->regs + REG2);
+
+	reset_chi(dbri, CHIslave, 128);
+
+	/* Note: this next doesn't work for 8-bit stereo, because the two
+	 * channels would be on timeslots 1 and 3, with 2 and 4 idle.
+	 * (See CS4215 datasheet Fig 15)
+	 *
+	 * DBRI non-contiguous mode would be required to make this work.
+	 */
+	data_width = dbri->mm.channels * dbri->mm.precision;
+
+	link_time_slot(dbri, 20, PIPEoutput, 16, 32, dbri->mm.offset + 32);
+	link_time_slot(dbri, 4, PIPEoutput, 16, data_width, dbri->mm.offset);
+	link_time_slot(dbri, 6, PIPEinput, 16, data_width, dbri->mm.offset);
+	link_time_slot(dbri, 21, PIPEinput, 16, 16, dbri->mm.offset + 40);
+
+	/* FIXME: enable CHI after _setdata? */
+	tmp = sbus_readl(dbri->regs + REG0);
+	tmp |= D_C;		/* Enable CHI */
+	sbus_writel(tmp, dbri->regs + REG0);
+
+	cs4215_setdata(dbri, 0);
+}
+
+/*
+ * Send the control information (i.e. audio format)
+ */
+static int cs4215_setctrl(snd_dbri_t * dbri)
+{
+	int i, val;
+	u32 tmp;
+
+	/* FIXME - let the CPU do something useful during these delays */
+
+	/* Temporarily mute outputs, and wait 1/8000 sec (125 us)
+	 * to make sure this takes.  This avoids clicking noises.
+	 */
+
+	cs4215_setdata(dbri, 1);
+	udelay(125);
+
+	/*
+	 * Enable Control mode: Set DBRI's PIO3 (4215's D/~C) to 0, then wait
+	 * 12 cycles <= 12/(5512.5*64) sec = 34.01 usec
+	 */
+	val = D_ENPIO | D_PIO1 | (dbri->mm.onboard ? D_PIO0 : D_PIO2);
+	sbus_writel(val, dbri->regs + REG2);
+	dprintk(D_MM, "cs4215_setctrl: reg2=0x%x\n", val);
+	udelay(34);
+
+	/* In Control mode, the CS4215 is a slave device, so the DBRI must
+	 * operate as CHI master, supplying clocking and frame synchronization.
+	 *
+	 * In Data mode, however, the CS4215 must be CHI master to insure
+	 * that its data stream is synchronous with its codec.
+	 *
+	 * The upshot of all this?  We start by putting the DBRI into master
+	 * mode, program the CS4215 in Control mode, then switch the CS4215
+	 * into Data mode and put the DBRI into slave mode.  Various timing
+	 * requirements must be observed along the way.
+	 *
+	 * Oh, and one more thing, on a SPARCStation 20 (and maybe
+	 * others?), the addressing of the CS4215's time slots is
+	 * offset by eight bits, so we add eight to all the "cycle"
+	 * values in the Define Time Slot (DTS) commands.  This is
+	 * done in hardware by a TI 248 that delays the DBRI->4215
+	 * frame sync signal by eight clock cycles.  Anybody know why?
+	 */
+	tmp = sbus_readl(dbri->regs + REG0);
+	tmp &= ~D_C;		/* Disable CHI */
+	sbus_writel(tmp, dbri->regs + REG0);
+
+	reset_chi(dbri, CHImaster, 128);
+
+	/*
+	 * Control mode:
+	 * Pipe 17: Send timeslots 1-4 (slots 5-8 are readonly)
+	 * Pipe 18: Receive timeslot 1 (clb).
+	 * Pipe 19: Receive timeslot 7 (version). 
+	 */
+
+	link_time_slot(dbri, 17, PIPEoutput, 16, 32, dbri->mm.offset);
+	link_time_slot(dbri, 18, PIPEinput, 16, 8, dbri->mm.offset);
+	link_time_slot(dbri, 19, PIPEinput, 16, 8, dbri->mm.offset + 48);
+
+	/* Wait for the chip to echo back CLB (Control Latch Bit) as zero */
+	dbri->mm.ctrl[0] &= ~CS4215_CLB;
+	xmit_fixed(dbri, 17, *(int *)dbri->mm.ctrl);
+
+	tmp = sbus_readl(dbri->regs + REG0);
+	tmp |= D_C;		/* Enable CHI */
+	sbus_writel(tmp, dbri->regs + REG0);
+
+	for (i = 64; ((dbri->mm.status & 0xe4) != 0x20); --i) {
+		udelay(125);
+	}
+	if (i == 0) {
+		dprintk(D_MM, "CS4215 didn't respond to CLB (0x%02x)\n",
+			dbri->mm.status);
+		return -1;
+	}
+
+	/* Disable changes to our copy of the version number, as we are about
+	 * to leave control mode.
+	 */
+	recv_fixed(dbri, 19, NULL);
+
+	/* Terminate CS4215 control mode - data sheet says
+	 * "Set CLB=1 and send two more frames of valid control info"
+	 */
+	dbri->mm.ctrl[0] |= CS4215_CLB;
+	xmit_fixed(dbri, 17, *(int *)dbri->mm.ctrl);
+
+	/* Two frames of control info @ 8kHz frame rate = 250 us delay */
+	udelay(250);
+
+	cs4215_setdata(dbri, 0);
+
+	return 0;
+}
+
+/*
+ * Setup the codec with the sampling rate, audio format and number of
+ * channels.
+ * As part of the process we resend the settings for the data
+ * timeslots as well.
+ */
+static int cs4215_prepare(snd_dbri_t * dbri, unsigned int rate,
+			  snd_pcm_format_t format, unsigned int channels)
+{
+	int freq_idx;
+	int ret = 0;
+
+	/* Lookup index for this rate */
+	for (freq_idx = 0; CS4215_FREQ[freq_idx].freq != 0; freq_idx++) {
+		if (CS4215_FREQ[freq_idx].freq == rate)
+			break;
+	}
+	if (CS4215_FREQ[freq_idx].freq != rate) {
+		printk(KERN_WARNING "DBRI: Unsupported rate %d Hz\n", rate);
+		return -1;
+	}
+
+	switch (format) {
+	case SNDRV_PCM_FORMAT_MU_LAW:
+		dbri->mm.ctrl[1] = CS4215_DFR_ULAW;
+		dbri->mm.precision = 8;
+		break;
+	case SNDRV_PCM_FORMAT_A_LAW:
+		dbri->mm.ctrl[1] = CS4215_DFR_ALAW;
+		dbri->mm.precision = 8;
+		break;
+	case SNDRV_PCM_FORMAT_U8:
+		dbri->mm.ctrl[1] = CS4215_DFR_LINEAR8;
+		dbri->mm.precision = 8;
+		break;
+	case SNDRV_PCM_FORMAT_S16_BE:
+		dbri->mm.ctrl[1] = CS4215_DFR_LINEAR16;
+		dbri->mm.precision = 16;
+		break;
+	default:
+		printk(KERN_WARNING "DBRI: Unsupported format %d\n", format);
+		return -1;
+	}
+
+	/* Add rate parameters */
+	dbri->mm.ctrl[1] |= CS4215_FREQ[freq_idx].csval;
+	dbri->mm.ctrl[2] = CS4215_XCLK |
+	    CS4215_BSEL_128 | CS4215_FREQ[freq_idx].xtal;
+
+	dbri->mm.channels = channels;
+	/* Stereo bit: 8 bit stereo not working yet. */
+	if ((channels > 1) && (dbri->mm.precision == 16))
+		dbri->mm.ctrl[1] |= CS4215_DFR_STEREO;
+
+	ret = cs4215_setctrl(dbri);
+	if (ret == 0)
+		cs4215_open(dbri);	/* set codec to data mode */
+
+	return ret;
+}
+
+/*
+ *
+ */
+static int cs4215_init(snd_dbri_t * dbri)
+{
+	u32 reg2 = sbus_readl(dbri->regs + REG2);
+	dprintk(D_MM, "cs4215_init: reg2=0x%x\n", reg2);
+
+	/* Look for the cs4215 chips */
+	if (reg2 & D_PIO2) {
+		dprintk(D_MM, "Onboard CS4215 detected\n");
+		dbri->mm.onboard = 1;
+	}
+	if (reg2 & D_PIO0) {
+		dprintk(D_MM, "Speakerbox detected\n");
+		dbri->mm.onboard = 0;
+
+		if (reg2 & D_PIO2) {
+			printk(KERN_INFO "DBRI: Using speakerbox / "
+			       "ignoring onboard mmcodec.\n");
+			sbus_writel(D_ENPIO2, dbri->regs + REG2);
+		}
+	}
+
+	if (!(reg2 & (D_PIO0 | D_PIO2))) {
+		printk(KERN_ERR "DBRI: no mmcodec found.\n");
+		return -EIO;
+	}
+
+	cs4215_setup_pipes(dbri);
+
+	cs4215_init_data(&dbri->mm);
+
+	/* Enable capture of the status & version timeslots. */
+	recv_fixed(dbri, 18, &dbri->mm.status);
+	recv_fixed(dbri, 19, &dbri->mm.version);
+
+	dbri->mm.offset = dbri->mm.onboard ? 0 : 8;
+	if (cs4215_setctrl(dbri) == -1 || dbri->mm.version == 0xff) {
+		dprintk(D_MM, "CS4215 failed probe at offset %d\n",
+			dbri->mm.offset);
+		return -EIO;
+	}
+	dprintk(D_MM, "Found CS4215 at offset %d\n", dbri->mm.offset);
+
+	return 0;
+}
+
+/*
+****************************************************************************
+*************************** DBRI interrupt handler *************************
+****************************************************************************
+
+The DBRI communicates with the CPU mainly via a circular interrupt
+buffer.  When an interrupt is signaled, the CPU walks through the
+buffer and calls dbri_process_one_interrupt() for each interrupt word.
+Complicated interrupts are handled by dedicated functions (which
+appear first in this file).  Any pending interrupts can be serviced by
+calling dbri_process_interrupt_buffer(), which works even if the CPU's
+interrupts are disabled.  This function is used by dbri_cmdsend()
+to make sure we're synced up with the chip after each command sequence,
+even if we're running cli'ed.
+
+*/
+
+/* xmit_descs()
+ *
+ * Transmit the current TD's for recording/playing, if needed.
+ * For playback, ALSA has filled the DMA memory with new data (we hope).
+ */
+static void xmit_descs(unsigned long data)
+{
+	snd_dbri_t *dbri = (snd_dbri_t *) data;
+	dbri_streaminfo_t *info;
+	volatile s32 *cmd;
+	unsigned long flags;
+	int first_td;
+
+	if (dbri == NULL)
+		return;		/* Disabled */
+
+	/* First check the recording stream for buffer overflow */
+	info = &dbri->stream_info[DBRI_REC];
+	spin_lock_irqsave(&dbri->lock, flags);
+
+	if ((info->left >= info->size) && (info->pipe >= 0)) {
+		first_td = dbri->pipes[info->pipe].first_desc;
+
+		dprintk(D_DESC, "xmit_descs rec @ TD %d\n", first_td);
+
+		/* Stream could be closed by the time we run. */
+		if (first_td < 0) {
+			goto play;
+		}
+
+		cmd = dbri_cmdlock(dbri, NoGetLock);
+		*(cmd++) = DBRI_CMD(D_SDP, 0,
+				    dbri->pipes[info->pipe].sdp
+				    | D_SDP_P | D_SDP_EVERY | D_SDP_C);
+		*(cmd++) = dbri->dma_dvma + dbri_dma_off(desc, first_td);
+		dbri_cmdsend(dbri, cmd);
+
+		/* Reset our admin of the pipe & bytes read. */
+		dbri->pipes[info->pipe].desc = first_td;
+		info->left = 0;
+	}
+
+play:
+	spin_unlock_irqrestore(&dbri->lock, flags);
+
+	/* Now check the playback stream for buffer underflow */
+	info = &dbri->stream_info[DBRI_PLAY];
+	spin_lock_irqsave(&dbri->lock, flags);
+
+	if ((info->left <= 0) && (info->pipe >= 0)) {
+		first_td = dbri->pipes[info->pipe].first_desc;
+
+		dprintk(D_DESC, "xmit_descs play @ TD %d\n", first_td);
+
+		/* Stream could be closed by the time we run. */
+		if (first_td < 0) {
+			spin_unlock_irqrestore(&dbri->lock, flags);
+			return;
+		}
+
+		cmd = dbri_cmdlock(dbri, NoGetLock);
+		*(cmd++) = DBRI_CMD(D_SDP, 0,
+				    dbri->pipes[info->pipe].sdp
+				    | D_SDP_P | D_SDP_EVERY | D_SDP_C);
+		*(cmd++) = dbri->dma_dvma + dbri_dma_off(desc, first_td);
+		dbri_cmdsend(dbri, cmd);
+
+		/* Reset our admin of the pipe & bytes written. */
+		dbri->pipes[info->pipe].desc = first_td;
+		info->left = info->size;
+	}
+	spin_unlock_irqrestore(&dbri->lock, flags);
+}
+
+DECLARE_TASKLET(xmit_descs_task, xmit_descs, 0);
+
+/* transmission_complete_intr()
+ *
+ * Called by main interrupt handler when DBRI signals transmission complete
+ * on a pipe (interrupt triggered by the B bit in a transmit descriptor).
+ *
+ * Walks through the pipe's list of transmit buffer descriptors, releasing
+ * each one's DMA buffer (if present), flagging the descriptor available,
+ * and signaling its callback routine (if present), before proceeding
+ * to the next one.  Stops when the first descriptor is found without
+ * TBC (Transmit Buffer Complete) set, or we've run through them all.
+ */
+
+static void transmission_complete_intr(snd_dbri_t * dbri, int pipe)
+{
+	dbri_streaminfo_t *info;
+	int td;
+	int status;
+
+	info = &dbri->stream_info[DBRI_PLAY];
+
+	td = dbri->pipes[pipe].desc;
+	while (td >= 0) {
+		if (td >= DBRI_NO_DESCS) {
+			printk(KERN_ERR "DBRI: invalid td on pipe %d\n", pipe);
+			return;
+		}
+
+		status = DBRI_TD_STATUS(dbri->dma->desc[td].word4);
+		if (!(status & DBRI_TD_TBC)) {
+			break;
+		}
+
+		dprintk(D_INT, "TD %d, status 0x%02x\n", td, status);
+
+		dbri->dma->desc[td].word4 = 0;	/* Reset it for next time. */
+		info->offset += dbri->descs[td].len;
+		info->left -= dbri->descs[td].len;
+
+		/* On the last TD, transmit them all again. */
+		if (dbri->descs[td].next == -1) {
+			if (info->left > 0) {
+				printk(KERN_WARNING
+				       "%d bytes left after last transfer.\n",
+				       info->left);
+				info->left = 0;
+			}
+			tasklet_schedule(&xmit_descs_task);
+		}
+
+		td = dbri->descs[td].next;
+		dbri->pipes[pipe].desc = td;
+	}
+
+	/* Notify ALSA */
+	if (spin_is_locked(&dbri->lock)) {
+		spin_unlock(&dbri->lock);
+		snd_pcm_period_elapsed(info->substream);
+		spin_lock(&dbri->lock);
+	} else
+		snd_pcm_period_elapsed(info->substream);
+}
+
+static void reception_complete_intr(snd_dbri_t * dbri, int pipe)
+{
+	dbri_streaminfo_t *info;
+	int rd = dbri->pipes[pipe].desc;
+	s32 status;
+
+	if (rd < 0 || rd >= DBRI_NO_DESCS) {
+		printk(KERN_ERR "DBRI: invalid rd on pipe %d\n", pipe);
+		return;
+	}
+
+	dbri->descs[rd].inuse = 0;
+	dbri->pipes[pipe].desc = dbri->descs[rd].next;
+	status = dbri->dma->desc[rd].word1;
+	dbri->dma->desc[rd].word1 = 0;	/* Reset it for next time. */
+
+	info = &dbri->stream_info[DBRI_REC];
+	info->offset += DBRI_RD_CNT(status);
+	info->left += DBRI_RD_CNT(status);
+
+	/* FIXME: Check status */
+
+	dprintk(D_INT, "Recv RD %d, status 0x%02x, len %d\n",
+		rd, DBRI_RD_STATUS(status), DBRI_RD_CNT(status));
+
+	/* On the last TD, transmit them all again. */
+	if (dbri->descs[rd].next == -1) {
+		if (info->left > info->size) {
+			printk(KERN_WARNING
+			       "%d bytes recorded in %d size buffer.\n",
+			       info->left, info->size);
+		}
+		tasklet_schedule(&xmit_descs_task);
+	}
+
+	/* Notify ALSA */
+	if (spin_is_locked(&dbri->lock)) {
+		spin_unlock(&dbri->lock);
+		snd_pcm_period_elapsed(info->substream);
+		spin_lock(&dbri->lock);
+	} else
+		snd_pcm_period_elapsed(info->substream);
+}
+
+static void dbri_process_one_interrupt(snd_dbri_t * dbri, int x)
+{
+	int val = D_INTR_GETVAL(x);
+	int channel = D_INTR_GETCHAN(x);
+	int command = D_INTR_GETCMD(x);
+	int code = D_INTR_GETCODE(x);
+#ifdef DBRI_DEBUG
+	int rval = D_INTR_GETRVAL(x);
+#endif
+
+	if (channel == D_INTR_CMD) {
+		dprintk(D_CMD, "INTR: Command: %-5s  Value:%d\n",
+			cmds[command], val);
+	} else {
+		dprintk(D_INT, "INTR: Chan:%d Code:%d Val:%#x\n",
+			channel, code, rval);
+	}
+
+	if (channel == D_INTR_CMD && command == D_WAIT) {
+		dbri->wait_seen++;
+		return;
+	}
+
+	switch (code) {
+	case D_INTR_BRDY:
+		reception_complete_intr(dbri, channel);
+		break;
+	case D_INTR_XCMP:
+	case D_INTR_MINT:
+		transmission_complete_intr(dbri, channel);
+		break;
+	case D_INTR_UNDR:
+		/* UNDR - Transmission underrun
+		 * resend SDP command with clear pipe bit (C) set
+		 */
+		{
+			volatile s32 *cmd;
+
+			int pipe = channel;
+			int td = dbri->pipes[pipe].desc;
+
+			dbri->dma->desc[td].word4 = 0;
+			cmd = dbri_cmdlock(dbri, NoGetLock);
+			*(cmd++) = DBRI_CMD(D_SDP, 0,
+					    dbri->pipes[pipe].sdp
+					    | D_SDP_P | D_SDP_C | D_SDP_2SAME);
+			*(cmd++) = dbri->dma_dvma + dbri_dma_off(desc, td);
+			dbri_cmdsend(dbri, cmd);
+		}
+		break;
+	case D_INTR_FXDT:
+		/* FXDT - Fixed data change */
+		if (dbri->pipes[channel].sdp & D_SDP_MSB)
+			val = reverse_bytes(val, dbri->pipes[channel].length);
+
+		if (dbri->pipes[channel].recv_fixed_ptr)
+			*(dbri->pipes[channel].recv_fixed_ptr) = val;
+		break;
+	default:
+		if (channel != D_INTR_CMD)
+			printk(KERN_WARNING
+			       "DBRI: Ignored Interrupt: %d (0x%x)\n", code, x);
+	}
+}
+
+/* dbri_process_interrupt_buffer advances through the DBRI's interrupt
+ * buffer until it finds a zero word (indicating nothing more to do
+ * right now).  Non-zero words require processing and are handed off
+ * to dbri_process_one_interrupt AFTER advancing the pointer.  This
+ * order is important since we might recurse back into this function
+ * and need to make sure the pointer has been advanced first.
+ */
+static void dbri_process_interrupt_buffer(snd_dbri_t * dbri)
+{
+	s32 x;
+
+	while ((x = dbri->dma->intr[dbri->dbri_irqp]) != 0) {
+		dbri->dma->intr[dbri->dbri_irqp] = 0;
+		dbri->dbri_irqp++;
+		if (dbri->dbri_irqp == (DBRI_NO_INTS * DBRI_INT_BLK))
+			dbri->dbri_irqp = 1;
+		else if ((dbri->dbri_irqp & (DBRI_INT_BLK - 1)) == 0)
+			dbri->dbri_irqp++;
+
+		dbri_process_one_interrupt(dbri, x);
+	}
+}
+
+static irqreturn_t snd_dbri_interrupt(int irq, void *dev_id,
+				      struct pt_regs *regs)
+{
+	snd_dbri_t *dbri = dev_id;
+	static int errcnt = 0;
+	int x;
+
+	if (dbri == NULL)
+		return IRQ_NONE;
+	spin_lock(&dbri->lock);
+
+	/*
+	 * Read it, so the interrupt goes away.
+	 */
+	x = sbus_readl(dbri->regs + REG1);
+
+	if (x & (D_MRR | D_MLE | D_LBG | D_MBE)) {
+		u32 tmp;
+
+		if (x & D_MRR)
+			printk(KERN_ERR
+			       "DBRI: Multiple Error Ack on SBus reg1=0x%x\n",
+			       x);
+		if (x & D_MLE)
+			printk(KERN_ERR
+			       "DBRI: Multiple Late Error on SBus reg1=0x%x\n",
+			       x);
+		if (x & D_LBG)
+			printk(KERN_ERR
+			       "DBRI: Lost Bus Grant on SBus reg1=0x%x\n", x);
+		if (x & D_MBE)
+			printk(KERN_ERR
+			       "DBRI: Burst Error on SBus reg1=0x%x\n", x);
+
+		/* Some of these SBus errors cause the chip's SBus circuitry
+		 * to be disabled, so just re-enable and try to keep going.
+		 *
+		 * The only one I've seen is MRR, which will be triggered
+		 * if you let a transmit pipe underrun, then try to CDP it.
+		 *
+		 * If these things persist, we should probably reset
+		 * and re-init the chip.
+		 */
+		if ((++errcnt) % 10 == 0) {
+			dprintk(D_INT, "Interrupt errors exceeded.\n");
+			dbri_reset(dbri);
+		} else {
+			tmp = sbus_readl(dbri->regs + REG0);
+			tmp &= ~(D_D);
+			sbus_writel(tmp, dbri->regs + REG0);
+		}
+	}
+
+	dbri_process_interrupt_buffer(dbri);
+
+	/* FIXME: Write 0 into regs to ACK interrupt */
+
+	spin_unlock(&dbri->lock);
+
+	return IRQ_HANDLED;
+}
+
+/****************************************************************************
+		PCM Interface
+****************************************************************************/
+static snd_pcm_hardware_t snd_dbri_pcm_hw = {
+	.info			= (SNDRV_PCM_INFO_MMAP |
+				   SNDRV_PCM_INFO_INTERLEAVED |
+				   SNDRV_PCM_INFO_BLOCK_TRANSFER |
+				   SNDRV_PCM_INFO_MMAP_VALID),
+	.formats		= SNDRV_PCM_FMTBIT_MU_LAW |
+				  SNDRV_PCM_FMTBIT_A_LAW |
+				  SNDRV_PCM_FMTBIT_U8 |
+				  SNDRV_PCM_FMTBIT_S16_BE,
+	.rates			= SNDRV_PCM_RATE_8000_48000,
+	.rate_min		= 8000,
+	.rate_max		= 48000,
+	.channels_min		= 1,
+	.channels_max		= 2,
+	.buffer_bytes_max	= (64 * 1024),
+	.period_bytes_min	= 1,
+	.period_bytes_max	= DBRI_TD_MAXCNT,
+	.periods_min		= 1,
+	.periods_max		= 1024,
+};
+
+static int snd_dbri_open(snd_pcm_substream_t * substream)
+{
+	snd_dbri_t *dbri = snd_pcm_substream_chip(substream);
+	snd_pcm_runtime_t *runtime = substream->runtime;
+	dbri_streaminfo_t *info = DBRI_STREAM(dbri, substream);
+	unsigned long flags;
+
+	dprintk(D_USR, "open audio output.\n");
+	runtime->hw = snd_dbri_pcm_hw;
+
+	spin_lock_irqsave(&dbri->lock, flags);
+	info->substream = substream;
+	info->left = 0;
+	info->offset = 0;
+	info->dvma_buffer = 0;
+	info->pipe = -1;
+	spin_unlock_irqrestore(&dbri->lock, flags);
+
+	cs4215_open(dbri);
+
+	return 0;
+}
+
+static int snd_dbri_close(snd_pcm_substream_t * substream)
+{
+	snd_dbri_t *dbri = snd_pcm_substream_chip(substream);
+	dbri_streaminfo_t *info = DBRI_STREAM(dbri, substream);
+
+	dprintk(D_USR, "close audio output.\n");
+	info->substream = NULL;
+	info->left = 0;
+	info->offset = 0;
+
+	return 0;
+}
+
+static int snd_dbri_hw_params(snd_pcm_substream_t * substream,
+			      snd_pcm_hw_params_t * hw_params)
+{
+	snd_pcm_runtime_t *runtime = substream->runtime;
+	snd_dbri_t *dbri = snd_pcm_substream_chip(substream);
+	dbri_streaminfo_t *info = DBRI_STREAM(dbri, substream);
+	int direction;
+	int ret;
+
+	/* set sampling rate, audio format and number of channels */
+	ret = cs4215_prepare(dbri, params_rate(hw_params),
+			     params_format(hw_params),
+			     params_channels(hw_params));
+	if (ret != 0)
+		return ret;
+
+	if ((ret = snd_pcm_lib_malloc_pages(substream,
+				params_buffer_bytes(hw_params))) < 0) {
+		snd_printk(KERN_ERR "malloc_pages failed with %d\n", ret);
+		return ret;
+	}
+
+	/* hw_params can get called multiple times. Only map the DMA once.
+	 */
+	if (info->dvma_buffer == 0) {
+		if (DBRI_STREAMNO(substream) == DBRI_PLAY)
+			direction = SBUS_DMA_TODEVICE;
+		else
+			direction = SBUS_DMA_FROMDEVICE;
+
+		info->dvma_buffer = sbus_map_single(dbri->sdev,
+					runtime->dma_area,
+					params_buffer_bytes(hw_params),
+					direction);
+	}
+
+	direction = params_buffer_bytes(hw_params);
+	dprintk(D_USR, "hw_params: %d bytes, dvma=%x\n",
+		direction, info->dvma_buffer);
+	return 0;
+}
+
+static int snd_dbri_hw_free(snd_pcm_substream_t * substream)
+{
+	snd_dbri_t *dbri = snd_pcm_substream_chip(substream);
+	dbri_streaminfo_t *info = DBRI_STREAM(dbri, substream);
+	int direction;
+	dprintk(D_USR, "hw_free.\n");
+
+	/* hw_free can get called multiple times. Only unmap the DMA once.
+	 */
+	if (info->dvma_buffer) {
+		if (DBRI_STREAMNO(substream) == DBRI_PLAY)
+			direction = SBUS_DMA_TODEVICE;
+		else
+			direction = SBUS_DMA_FROMDEVICE;
+
+		sbus_unmap_single(dbri->sdev, info->dvma_buffer,
+				  substream->runtime->buffer_size, direction);
+		info->dvma_buffer = 0;
+	}
+	info->pipe = -1;
+
+	return snd_pcm_lib_free_pages(substream);
+}
+
+static int snd_dbri_prepare(snd_pcm_substream_t * substream)
+{
+	snd_dbri_t *dbri = snd_pcm_substream_chip(substream);
+	dbri_streaminfo_t *info = DBRI_STREAM(dbri, substream);
+	snd_pcm_runtime_t *runtime = substream->runtime;
+	int ret;
+
+	info->size = snd_pcm_lib_buffer_bytes(substream);
+	if (DBRI_STREAMNO(substream) == DBRI_PLAY)
+		info->pipe = 4;	/* Send pipe */
+	else {
+		info->pipe = 6;	/* Receive pipe */
+		info->left = info->size;	/* To trigger submittal */
+	}
+
+	spin_lock_irq(&dbri->lock);
+
+	/* Setup the all the transmit/receive desciptors to cover the
+	 * whole DMA buffer.
+	 */
+	ret = setup_descs(dbri, DBRI_STREAMNO(substream),
+			  snd_pcm_lib_period_bytes(substream));
+
+	runtime->stop_threshold = DBRI_TD_MAXCNT / runtime->channels;
+
+	spin_unlock_irq(&dbri->lock);
+
+	dprintk(D_USR, "prepare audio output. %d bytes\n", info->size);
+	return ret;
+}
+
+static int snd_dbri_trigger(snd_pcm_substream_t * substream, int cmd)
+{
+	snd_dbri_t *dbri = snd_pcm_substream_chip(substream);
+	dbri_streaminfo_t *info = DBRI_STREAM(dbri, substream);
+	int ret = 0;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+		dprintk(D_USR, "start audio, period is %d bytes\n",
+			(int)snd_pcm_lib_period_bytes(substream));
+		/* Enable & schedule the tasklet that re-submits the TDs. */
+		xmit_descs_task.data = (unsigned long)dbri;
+		tasklet_schedule(&xmit_descs_task);
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+		dprintk(D_USR, "stop audio.\n");
+		/* Make the tasklet bail out immediately. */
+		xmit_descs_task.data = 0;
+		reset_pipe(dbri, info->pipe);
+		break;
+	default:
+		ret = -EINVAL;
+	}
+
+	return ret;
+}
+
+static snd_pcm_uframes_t snd_dbri_pointer(snd_pcm_substream_t * substream)
+{
+	snd_dbri_t *dbri = snd_pcm_substream_chip(substream);
+	dbri_streaminfo_t *info = DBRI_STREAM(dbri, substream);
+	snd_pcm_uframes_t ret;
+
+	ret = bytes_to_frames(substream->runtime, info->offset)
+		% substream->runtime->buffer_size;
+	dprintk(D_USR, "I/O pointer: %ld frames, %d bytes left.\n",
+		ret, info->left);
+	return ret;
+}
+
+static snd_pcm_ops_t snd_dbri_ops = {
+	.open = snd_dbri_open,
+	.close = snd_dbri_close,
+	.ioctl = snd_pcm_lib_ioctl,
+	.hw_params = snd_dbri_hw_params,
+	.hw_free = snd_dbri_hw_free,
+	.prepare = snd_dbri_prepare,
+	.trigger = snd_dbri_trigger,
+	.pointer = snd_dbri_pointer,
+};
+
+static int __devinit snd_dbri_pcm(snd_dbri_t * dbri)
+{
+	snd_pcm_t *pcm;
+	int err;
+
+	if ((err = snd_pcm_new(dbri->card,
+			       /* ID */		    "sun_dbri",
+			       /* device */	    0,
+			       /* playback count */ 1,
+			       /* capture count */  1, &pcm)) < 0)
+		return err;
+	snd_assert(pcm != NULL, return -EINVAL);
+
+	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_dbri_ops);
+	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_dbri_ops);
+
+	pcm->private_data = dbri;
+	pcm->info_flags = 0;
+	strcpy(pcm->name, dbri->card->shortname);
+	dbri->pcm = pcm;
+
+	if ((err = snd_pcm_lib_preallocate_pages_for_all(pcm,
+			SNDRV_DMA_TYPE_CONTINUOUS,
+			snd_dma_continuous_data(GFP_KERNEL),
+			64 * 1024, 64 * 1024)) < 0) {
+		return err;
+	}
+
+	return 0;
+}
+
+/*****************************************************************************
+			Mixer interface
+*****************************************************************************/
+
+static int snd_cs4215_info_volume(snd_kcontrol_t * kcontrol,
+				  snd_ctl_elem_info_t * uinfo)
+{
+	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
+	uinfo->count = 2;
+	uinfo->value.integer.min = 0;
+	if (kcontrol->private_value == DBRI_PLAY) {
+		uinfo->value.integer.max = DBRI_MAX_VOLUME;
+	} else {
+		uinfo->value.integer.max = DBRI_MAX_GAIN;
+	}
+	return 0;
+}
+
+static int snd_cs4215_get_volume(snd_kcontrol_t * kcontrol,
+				 snd_ctl_elem_value_t * ucontrol)
+{
+	snd_dbri_t *dbri = snd_kcontrol_chip(kcontrol);
+	dbri_streaminfo_t *info;
+	snd_assert(dbri != NULL, return -EINVAL);
+	info = &dbri->stream_info[kcontrol->private_value];
+	snd_assert(info != NULL, return -EINVAL);
+
+	ucontrol->value.integer.value[0] = info->left_gain;
+	ucontrol->value.integer.value[1] = info->right_gain;
+	return 0;
+}
+
+static int snd_cs4215_put_volume(snd_kcontrol_t * kcontrol,
+				 snd_ctl_elem_value_t * ucontrol)
+{
+	snd_dbri_t *dbri = snd_kcontrol_chip(kcontrol);
+	dbri_streaminfo_t *info = &dbri->stream_info[kcontrol->private_value];
+	unsigned long flags;
+	int changed = 0;
+
+	if (info->left_gain != ucontrol->value.integer.value[0]) {
+		info->left_gain = ucontrol->value.integer.value[0];
+		changed = 1;
+	}
+	if (info->right_gain != ucontrol->value.integer.value[1]) {
+		info->right_gain = ucontrol->value.integer.value[1];
+		changed = 1;
+	}
+	if (changed == 1) {
+		/* First mute outputs, and wait 1/8000 sec (125 us)
+		 * to make sure this takes.  This avoids clicking noises.
+		 */
+		spin_lock_irqsave(&dbri->lock, flags);
+
+		cs4215_setdata(dbri, 1);
+		udelay(125);
+		cs4215_setdata(dbri, 0);
+
+		spin_unlock_irqrestore(&dbri->lock, flags);
+	}
+	return changed;
+}
+
+static int snd_cs4215_info_single(snd_kcontrol_t * kcontrol,
+				  snd_ctl_elem_info_t * uinfo)
+{
+	int mask = (kcontrol->private_value >> 16) & 0xff;
+
+	uinfo->type = (mask == 1) ?
+	    SNDRV_CTL_ELEM_TYPE_BOOLEAN : SNDRV_CTL_ELEM_TYPE_INTEGER;
+	uinfo->count = 1;
+	uinfo->value.integer.min = 0;
+	uinfo->value.integer.max = mask;
+	return 0;
+}
+
+static int snd_cs4215_get_single(snd_kcontrol_t * kcontrol,
+				 snd_ctl_elem_value_t * ucontrol)
+{
+	snd_dbri_t *dbri = snd_kcontrol_chip(kcontrol);
+	int elem = kcontrol->private_value & 0xff;
+	int shift = (kcontrol->private_value >> 8) & 0xff;
+	int mask = (kcontrol->private_value >> 16) & 0xff;
+	int invert = (kcontrol->private_value >> 24) & 1;
+	snd_assert(dbri != NULL, return -EINVAL);
+
+	if (elem < 4) {
+		ucontrol->value.integer.value[0] =
+		    (dbri->mm.data[elem] >> shift) & mask;
+	} else {
+		ucontrol->value.integer.value[0] =
+		    (dbri->mm.ctrl[elem - 4] >> shift) & mask;
+	}
+
+	if (invert == 1) {
+		ucontrol->value.integer.value[0] =
+		    mask - ucontrol->value.integer.value[0];
+	}
+	return 0;
+}
+
+static int snd_cs4215_put_single(snd_kcontrol_t * kcontrol,
+				 snd_ctl_elem_value_t * ucontrol)
+{
+	snd_dbri_t *dbri = snd_kcontrol_chip(kcontrol);
+	unsigned long flags;
+	int elem = kcontrol->private_value & 0xff;
+	int shift = (kcontrol->private_value >> 8) & 0xff;
+	int mask = (kcontrol->private_value >> 16) & 0xff;
+	int invert = (kcontrol->private_value >> 24) & 1;
+	int changed = 0;
+	unsigned short val;
+	snd_assert(dbri != NULL, return -EINVAL);
+
+	val = (ucontrol->value.integer.value[0] & mask);
+	if (invert == 1)
+		val = mask - val;
+	val <<= shift;
+
+	if (elem < 4) {
+		dbri->mm.data[elem] = (dbri->mm.data[elem] &
+				       ~(mask << shift)) | val;
+		changed = (val != dbri->mm.data[elem]);
+	} else {
+		dbri->mm.ctrl[elem - 4] = (dbri->mm.ctrl[elem - 4] &
+					   ~(mask << shift)) | val;
+		changed = (val != dbri->mm.ctrl[elem - 4]);
+	}
+
+	dprintk(D_GEN, "put_single: mask=0x%x, changed=%d, "
+		"mixer-value=%ld, mm-value=0x%x\n",
+		mask, changed, ucontrol->value.integer.value[0],
+		dbri->mm.data[elem & 3]);
+
+	if (changed) {
+		/* First mute outputs, and wait 1/8000 sec (125 us)
+		 * to make sure this takes.  This avoids clicking noises.
+		 */
+		spin_lock_irqsave(&dbri->lock, flags);
+
+		cs4215_setdata(dbri, 1);
+		udelay(125);
+		cs4215_setdata(dbri, 0);
+
+		spin_unlock_irqrestore(&dbri->lock, flags);
+	}
+	return changed;
+}
+
+/* Entries 0-3 map to the 4 data timeslots, entries 4-7 map to the 4 control
+   timeslots. Shift is the bit offset in the timeslot, mask defines the
+   number of bits. invert is a boolean for use with attenuation.
+ */
+#define CS4215_SINGLE(xname, entry, shift, mask, invert) \
+{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \
+  .info = snd_cs4215_info_single, \
+  .get = snd_cs4215_get_single, .put = snd_cs4215_put_single, \
+  .private_value = entry | (shift << 8) | (mask << 16) | (invert << 24) },
+
+static snd_kcontrol_new_t dbri_controls[] __devinitdata = {
+	{
+	 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+	 .name  = "Playback Volume",
+	 .info  = snd_cs4215_info_volume,
+	 .get   = snd_cs4215_get_volume,
+	 .put   = snd_cs4215_put_volume,
+	 .private_value = DBRI_PLAY,
+	 },
+	CS4215_SINGLE("Headphone switch", 0, 7, 1, 0)
+	CS4215_SINGLE("Line out switch", 0, 6, 1, 0)
+	CS4215_SINGLE("Speaker switch", 1, 6, 1, 0)
+	{
+	 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+	 .name  = "Capture Volume",
+	 .info  = snd_cs4215_info_volume,
+	 .get   = snd_cs4215_get_volume,
+	 .put   = snd_cs4215_put_volume,
+	 .private_value = DBRI_REC,
+	 },
+	/* FIXME: mic/line switch */
+	CS4215_SINGLE("Line in switch", 2, 4, 1, 0)
+	CS4215_SINGLE("High Pass Filter switch", 5, 7, 1, 0)
+	CS4215_SINGLE("Monitor Volume", 3, 4, 0xf, 1)
+	CS4215_SINGLE("Mic boost", 4, 4, 1, 1)
+};
+
+#define NUM_CS4215_CONTROLS (sizeof(dbri_controls)/sizeof(snd_kcontrol_new_t))
+
+static int __init snd_dbri_mixer(snd_dbri_t * dbri)
+{
+	snd_card_t *card;
+	int idx, err;
+
+	snd_assert(dbri != NULL && dbri->card != NULL, return -EINVAL);
+
+	card = dbri->card;
+	strcpy(card->mixername, card->shortname);
+
+	for (idx = 0; idx < NUM_CS4215_CONTROLS; idx++) {
+		if ((err = snd_ctl_add(card,
+				       snd_ctl_new1(&dbri_controls[idx],
+						    dbri))) < 0)
+			return err;
+	}
+
+	for (idx = DBRI_REC; idx < DBRI_NO_STREAMS; idx++) {
+		dbri->stream_info[idx].left_gain = 0;
+		dbri->stream_info[idx].right_gain = 0;
+		dbri->stream_info[idx].balance = DBRI_MID_BALANCE;
+	}
+
+	return 0;
+}
+
+/****************************************************************************
+			/proc interface
+****************************************************************************/
+static void dbri_regs_read(snd_info_entry_t * entry, snd_info_buffer_t * buffer)
+{
+	snd_dbri_t *dbri = entry->private_data;
+
+	snd_iprintf(buffer, "REG0: 0x%x\n", sbus_readl(dbri->regs + REG0));
+	snd_iprintf(buffer, "REG2: 0x%x\n", sbus_readl(dbri->regs + REG2));
+	snd_iprintf(buffer, "REG8: 0x%x\n", sbus_readl(dbri->regs + REG8));
+	snd_iprintf(buffer, "REG9: 0x%x\n", sbus_readl(dbri->regs + REG9));
+}
+
+#ifdef DBRI_DEBUG
+static void dbri_debug_read(snd_info_entry_t * entry,
+			    snd_info_buffer_t * buffer)
+{
+	snd_dbri_t *dbri = entry->private_data;
+	int pipe;
+	snd_iprintf(buffer, "debug=%d\n", dbri_debug);
+
+	snd_iprintf(buffer, "CHI pipe in=%d, out=%d\n",
+		    dbri->chi_in_pipe, dbri->chi_out_pipe);
+	for (pipe = 0; pipe < 32; pipe++) {
+		if (pipe_active(dbri, pipe)) {
+			struct dbri_pipe *pptr = &dbri->pipes[pipe];
+			snd_iprintf(buffer,
+				    "Pipe %d: %s SDP=0x%x desc=%d, "
+				    "len=%d @ %d prev: %d next %d\n",
+				    pipe,
+				    (pptr->direction ==
+				     PIPEinput ? "input" : "output"), pptr->sdp,
+				    pptr->desc, pptr->length, pptr->cycle,
+				    pptr->prevpipe, pptr->nextpipe);
+		}
+	}
+}
+
+static void dbri_debug_write(snd_info_entry_t * entry,
+			     snd_info_buffer_t * buffer)
+{
+	char line[80];
+	int i;
+
+	if (snd_info_get_line(buffer, line, 80) == 0) {
+		sscanf(line, "%d\n", &i);
+		dbri_debug = i & 0x3f;
+	}
+}
+#endif
+
+void snd_dbri_proc(snd_dbri_t * dbri)
+{
+	snd_info_entry_t *entry;
+	int err;
+
+	err = snd_card_proc_new(dbri->card, "regs", &entry);
+	snd_info_set_text_ops(entry, dbri, 1024, dbri_regs_read);
+
+#ifdef DBRI_DEBUG
+	err = snd_card_proc_new(dbri->card, "debug", &entry);
+	snd_info_set_text_ops(entry, dbri, 4096, dbri_debug_read);
+	entry->mode = S_IFREG | S_IRUGO | S_IWUSR; /* Writable for root */
+	entry->c.text.write_size = 256;
+	entry->c.text.write = dbri_debug_write;
+#endif
+}
+
+/*
+****************************************************************************
+**************************** Initialization ********************************
+****************************************************************************
+*/
+static void snd_dbri_free(snd_dbri_t * dbri);
+
+static int __init snd_dbri_create(snd_card_t * card,
+				  struct sbus_dev *sdev,
+				  struct linux_prom_irqs *irq, int dev)
+{
+	snd_dbri_t *dbri = card->private_data;
+	int err;
+
+	spin_lock_init(&dbri->lock);
+	dbri->card = card;
+	dbri->sdev = sdev;
+	dbri->irq = irq->pri;
+	dbri->dbri_version = sdev->prom_name[9];
+
+	dbri->dma = sbus_alloc_consistent(sdev, sizeof(struct dbri_dma),
+					  &dbri->dma_dvma);
+	memset((void *)dbri->dma, 0, sizeof(struct dbri_dma));
+
+	dprintk(D_GEN, "DMA Cmd Block 0x%p (0x%08x)\n",
+		dbri->dma, dbri->dma_dvma);
+
+	/* Map the registers into memory. */
+	dbri->regs_size = sdev->reg_addrs[0].reg_size;
+	dbri->regs = sbus_ioremap(&sdev->resource[0], 0,
+				  dbri->regs_size, "DBRI Registers");
+	if (!dbri->regs) {
+		printk(KERN_ERR "DBRI: could not allocate registers\n");
+		sbus_free_consistent(sdev, sizeof(struct dbri_dma),
+				     (void *)dbri->dma, dbri->dma_dvma);
+		return -EIO;
+	}
+
+	err = request_irq(dbri->irq, snd_dbri_interrupt, SA_SHIRQ,
+			  "DBRI audio", dbri);
+	if (err) {
+		printk(KERN_ERR "DBRI: Can't get irq %d\n", dbri->irq);
+		sbus_iounmap(dbri->regs, dbri->regs_size);
+		sbus_free_consistent(sdev, sizeof(struct dbri_dma),
+				     (void *)dbri->dma, dbri->dma_dvma);
+		return err;
+	}
+
+	/* Do low level initialization of the DBRI and CS4215 chips */
+	dbri_initialize(dbri);
+	err = cs4215_init(dbri);
+	if (err) {
+		snd_dbri_free(dbri);
+		return err;
+	}
+
+	dbri->next = dbri_list;
+	dbri_list = dbri;
+
+	return 0;
+}
+
+static void snd_dbri_free(snd_dbri_t * dbri)
+{
+	dprintk(D_GEN, "snd_dbri_free\n");
+	dbri_reset(dbri);
+
+	if (dbri->irq)
+		free_irq(dbri->irq, dbri);
+
+	if (dbri->regs)
+		sbus_iounmap(dbri->regs, dbri->regs_size);
+
+	if (dbri->dma)
+		sbus_free_consistent(dbri->sdev, sizeof(struct dbri_dma),
+				     (void *)dbri->dma, dbri->dma_dvma);
+}
+
+static int __init dbri_attach(int prom_node, struct sbus_dev *sdev)
+{
+	snd_dbri_t *dbri;
+	struct linux_prom_irqs irq;
+	struct resource *rp;
+	snd_card_t *card;
+	static int dev = 0;
+	int err;
+
+	if (sdev->prom_name[9] < 'e') {
+		printk(KERN_ERR "DBRI: unsupported chip version %c found.\n",
+		       sdev->prom_name[9]);
+		return -EIO;
+	}
+
+	if (dev >= SNDRV_CARDS)
+		return -ENODEV;
+	if (!enable[dev]) {
+		dev++;
+		return -ENOENT;
+	}
+
+	prom_getproperty(prom_node, "intr", (char *)&irq, sizeof(irq));
+
+	card = snd_card_new(index[dev], id[dev], THIS_MODULE,
+			    sizeof(snd_dbri_t));
+	if (card == NULL)
+		return -ENOMEM;
+
+	strcpy(card->driver, "DBRI");
+	strcpy(card->shortname, "Sun DBRI");
+	rp = &sdev->resource[0];
+	sprintf(card->longname, "%s at 0x%02lx:0x%08lx, irq %s",
+		card->shortname,
+		rp->flags & 0xffL, rp->start, __irq_itoa(irq.pri));
+
+	if ((err = snd_dbri_create(card, sdev, &irq, dev)) < 0) {
+		snd_card_free(card);
+		return err;
+	}
+
+	dbri = (snd_dbri_t *) card->private_data;
+	if ((err = snd_dbri_pcm(dbri)) < 0) {
+		snd_dbri_free(dbri);
+		snd_card_free(card);
+		return err;
+	}
+
+	if ((err = snd_dbri_mixer(dbri)) < 0) {
+		snd_dbri_free(dbri);
+		snd_card_free(card);
+		return err;
+	}
+
+	/* /proc file handling */
+	snd_dbri_proc(dbri);
+
+	if ((err = snd_card_register(card)) < 0) {
+		snd_dbri_free(dbri);
+		snd_card_free(card);
+		return err;
+	}
+
+	printk(KERN_INFO "audio%d at %p (irq %d) is DBRI(%c)+CS4215(%d)\n",
+	       dev, dbri->regs,
+	       dbri->irq, dbri->dbri_version, dbri->mm.version);
+	dev++;
+
+	return 0;
+}
+
+/* Probe for the dbri chip and then attach the driver. */
+static int __init dbri_init(void)
+{
+	struct sbus_bus *sbus;
+	struct sbus_dev *sdev;
+	int found = 0;
+
+	/* Probe each SBUS for the DBRI chip(s). */
+	for_all_sbusdev(sdev, sbus) {
+		/*
+		 * The version is coded in the last character
+		 */
+		if (!strncmp(sdev->prom_name, "SUNW,DBRI", 9)) {
+			dprintk(D_GEN, "DBRI: Found %s in SBUS slot %d\n",
+				sdev->prom_name, sdev->slot);
+
+			if (dbri_attach(sdev->prom_node, sdev) == 0)
+				found++;
+		}
+	}
+
+	return (found > 0) ? 0 : -EIO;
+}
+
+static void __exit dbri_exit(void)
+{
+	snd_dbri_t *this = dbri_list;
+
+	while (this != NULL) {
+		snd_dbri_t *next = this->next;
+		snd_card_t *card = this->card;
+
+		snd_dbri_free(this);
+		snd_card_free(card);
+		this = next;
+	}
+	dbri_list = NULL;
+}
+
+module_init(dbri_init);
+module_exit(dbri_exit);