cs46xx.c

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/*
 *	Crystal SoundFusion CS46xx driver
 *
 *	Copyright 1998-2000 Cirrus Logic Corporation <[e-mail]>
 *	Copyright 1999-2000 Jaroslav Kysela <[e-mail]>
 *	Copyright 2000 Alan Cox <[e-mail]>
 *
 *	The core of this code is taken from the ALSA project driver by 
 *	Jaroslav. Please send Jaroslav the credit for the driver and 
 *	report bugs in this port to <[e-mail]>
 *
 *	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., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *	Current maintainers:
 *		Cirrus Logic Corporation, Thomas Woller (tw)
 *			<[e-mail]>
 *		Nils Faerber (nf)
 *			<[e-mail]>
 *		Thanks to David Pollard for testing.
 *
 *	Changes:
 *	20000909-nf	Changed cs_read, cs_write and drain_dac
 *	20001025-tw	Separate Playback/Capture structs and buffers.
 *			Added Scatter/Gather support for Playback.
 *			Added Capture.
 *	20001027-nf	Port to kernel 2.4.0-test9, some clean-ups
 *			Start of powermanagement support (CS46XX_PM).
 *	20001128-tw	Add module parm for default buffer order.
 *			added DMA_GFP flag to kmalloc dma buffer allocs.
 *			backfill silence to eliminate stuttering on
 *			underruns.
 *	20001201-tw	add resyncing of swptr on underruns.
 *	20001205-tw-nf	fixed GETOSPACE ioctl() after open()
 *
 *
 *	Status:
 *	Playback/Capture supported from 8k-48k.
 *	16Bit Signed LE & 8Bit Unsigned, with Mono or Stereo supported.
 */
 
#include <linux/module.h>
#include <linux/version.h>
#include <linux/string.h>
#include <linux/ctype.h>
#include <linux/ioport.h>
#include <linux/sched.h>
#include <linux/delay.h>
#include <linux/sound.h>
#include <linux/malloc.h>
#include <linux/soundcard.h>
#include <linux/pci.h>
#ifdef CS46XX_PM
#include <linux/pm.h>
#endif
#include <asm/io.h>
#include <asm/dma.h>
#include <linux/init.h>
#include <linux/poll.h>
#include <linux/spinlock.h>
#include <linux/ac97_codec.h>
#include <linux/wrapper.h>
#include <asm/uaccess.h>
#include <asm/hardirq.h>

#include "cs461x.h"


/* MIDI buffer sizes */
#define CS_MIDIINBUF  500
#define CS_MIDIOUTBUF 500

#define ADC_RUNNING	1
#define DAC_RUNNING	2

#define CS_FMT_16BIT	1		/* These are fixed in fact */
#define CS_FMT_STEREO	2
#define CS_FMT_MASK	3

#define CS_TYPE_ADC	1
#define CS_TYPE_DAC	2
/*
 *	CS461x definitions
 */
 
#define CS461X_BA0_SIZE		0x2000
#define CS461X_BA1_DATA0_SIZE	0x3000
#define CS461X_BA1_DATA1_SIZE	0x3800
#define CS461X_BA1_PRG_SIZE	0x7000
#define CS461X_BA1_REG_SIZE	0x0100

#define GOF_PER_SEC	200

#define CSDEBUG_INTERFACE 1
#define CSDEBUG 1
/*
 * Turn on/off debugging compilation by using 1/0 respectively for CSDEBUG
 *
 *
 * CSDEBUG is usual mode is set to 1, then use the
 * cs_debuglevel and cs_debugmask to turn on or off debugging.
 * Debug level of 1 has been defined to be kernel errors and info
 * that should be printed on any released driver.
 */
#if CSDEBUG
#define CS_DBGOUT(mask,level,x) if((cs_debuglevel >= (level)) && ((mask) & cs_debugmask)) {x;} 
#else
#define CS_DBGOUT(mask,level,x) 
#endif
/*
 * cs_debugmask areas
 */
#define CS_INIT	 	0x00000001		/* initialization and probe functions */
#define CS_ERROR 	0x00000002		/* tmp debugging bit placeholder */
#define CS_INTERRUPT	0x00000004		/* interrupt handler (separate from all other) */
#define CS_FUNCTION 	0x00000008		/* enter/leave functions */
#define CS_WAVE_WRITE 	0x00000010		/* write information for wave */
#define CS_WAVE_READ 	0x00000020		/* read information for wave */
#define CS_MIDI_WRITE 	0x00000040		/* write information for midi */
#define CS_MIDI_READ 	0x00000080		/* read information for midi */
#define CS_MPU401_WRITE 0x00000100		/* write information for mpu401 */
#define CS_MPU401_READ 	0x00000200		/* read information for mpu401 */
#define CS_OPEN		0x00000400		/* all open functions in the driver */
#define CS_RELEASE	0x00000800		/* all release functions in the driver */
#define CS_PARMS	0x00001000		/* functional and operational parameters */
#define CS_IOCTL	0x00002000		/* ioctl (non-mixer) */
#define CS_TMP		0x10000000		/* tmp debug mask bit */

#if CSDEBUG
static unsigned long cs_debuglevel=1;			/* levels range from 1-9 */
static unsigned long cs_debugmask=CS_INIT | CS_ERROR;	/* use CS_DBGOUT with various mask values */
#endif
#define DMABUF_DEFAULTORDER 3
static unsigned long defaultorder=DMABUF_DEFAULTORDER;
#if MODULE
MODULE_PARM(defaultorder, "i");
MODULE_PARM(cs_debuglevel, "i");
MODULE_PARM(cs_debugmask, "i");
#endif

static int external_amp = 0;
static int thinkpad = 0;


/* An instance of the 4610 channel */

struct cs_channel 
{
	int used;
	int num;
	void *state;
};

#define DRIVER_VERSION "1.10"

/* magic numbers to protect our data structures */
#define CS_CARD_MAGIC		0x43525553 /* "CRUS" */
#define CS_STATE_MAGIC		0x4c4f4749 /* "LOGI" */
#define NR_HW_CH		3

/* maxinum number of AC97 codecs connected, AC97 2.0 defined 4 */
#define NR_AC97		2

static const unsigned sample_size[] = { 1, 2, 2, 4 };
static const unsigned sample_shift[] = { 0, 1, 1, 2 };

/* "software" or virtual channel, an instance of opened /dev/dsp */
struct cs_state {
	unsigned int magic;
	struct cs_card *card;	/* Card info */

	/* single open lock mechanism, only used for recording */
	struct semaphore open_sem;
	wait_queue_head_t open_wait;

	/* file mode */
	mode_t open_mode;

	/* virtual channel number */
	int virt;
	
	struct dmabuf {
		/* wave sample stuff */
		unsigned int rate;
		unsigned char fmt, enable;

		/* hardware channel */
		struct cs_channel *channel;
		int pringbuf;		/* Software ring slot */
		void *pbuf;		/* 4K hardware DMA buffer */

		/* OSS buffer management stuff */
		void *rawbuf;
		dma_addr_t dma_handle;
		unsigned buforder;
		unsigned numfrag;
		unsigned fragshift;
		unsigned divisor;
		unsigned type;
		void *tmpbuff;			/* tmp buffer for sample conversions */
		dma_addr_t dma_handle_tmpbuff;
		unsigned buforder_tmpbuff;	/* Log base 2 of size in bytes.. */

		/* our buffer acts like a circular ring */
		unsigned hwptr;		/* where dma last started, updated by update_ptr */
		unsigned swptr;		/* where driver last clear/filled, updated by read/write */
		int count;		/* bytes to be comsumed or been generated by dma machine */
		unsigned total_bytes;	/* total bytes dmaed by hardware */
		unsigned blocks;	/* total blocks */

		unsigned error;		/* number of over/underruns */
		unsigned underrun;	/* underrun pending before next write has occurred */
		wait_queue_head_t wait;	/* put process on wait queue when no more space in buffer */

		/* redundant, but makes calculations easier */
		unsigned fragsize;
		unsigned dmasize;
		unsigned fragsamples;

		/* OSS stuff */
		unsigned mapped:1;
		unsigned ready:1;
		unsigned endcleared:1;
		unsigned SGok:1;
		unsigned update_flag;
		unsigned ossfragshift;
		int ossmaxfrags;
		unsigned subdivision;
	} dmabuf;
};


struct cs_card {
	struct cs_channel channel[2];
	unsigned int magic;

	/* We keep cs461x cards in a linked list */
	struct cs_card *next;

	/* The cs461x has a certain amount of cross channel interaction
	   so we use a single per card lock */
	spinlock_t lock;

	/* PCI device stuff */
	struct pci_dev * pci_dev;

	unsigned int pctl, cctl;	/* Hardware DMA flag sets */

	/* soundcore stuff */
	int dev_audio;
	int dev_midi;

	/* structures for abstraction of hardware facilities, codecs, banks and channels*/
	struct ac97_codec *ac97_codec[NR_AC97];
	struct cs_state *states[2];

	u16 ac97_features;
	
	int amplifier;			/* Amplifier control */
	void (*amplifier_ctrl)(struct cs_card *, int);
	
	int active;			/* Active clocking */
	void (*active_ctrl)(struct cs_card *, int);
	
	/* hardware resources */
	unsigned long ba0_addr;
	unsigned long ba1_addr;
	u32 irq;
	
	/* mappings */
	void *ba0;
	union
	{
		struct
		{
			u8 *data0;
			u8 *data1;
			u8 *pmem;
			u8 *reg;
		} name;
		u8 *idx[4];
	} ba1;
	
	/* Function support */
	struct cs_channel *(*alloc_pcm_channel)(struct cs_card *);
	struct cs_channel *(*alloc_rec_pcm_channel)(struct cs_card *);
	void (*free_pcm_channel)(struct cs_card *, int chan);

	/* /dev/midi stuff */
	struct {
		unsigned ird, iwr, icnt;
		unsigned ord, owr, ocnt;
		wait_queue_head_t open_wait;
		wait_queue_head_t iwait;
		wait_queue_head_t owait;
		spinlock_t lock;
		unsigned char ibuf[CS_MIDIINBUF];
		unsigned char obuf[CS_MIDIOUTBUF];
		mode_t open_mode;
		struct semaphore open_sem;
	} midi;
};

static struct cs_card *devs = NULL;

static int cs_open_mixdev(struct inode *inode, struct file *file);
static int cs_release_mixdev(struct inode *inode, struct file *file);
static int cs_ioctl_mixdev(struct inode *inode, struct file *file, unsigned int cmd,
				unsigned long arg);
static loff_t cs_llseek(struct file *file, loff_t offset, int origin);

extern __inline__ unsigned ld2(unsigned int x)
{
	unsigned r = 0;
	
	if (x >= 0x10000) {
		x >>= 16;
		r += 16;
	}
	if (x >= 0x100) {
		x >>= 8;
		r += 8;
	}
	if (x >= 0x10) {
		x >>= 4;
		r += 4;
	}
	if (x >= 4) {
		x >>= 2;
		r += 2;
	}
	if (x >= 2)
		r++;
	return r;
}

#if CSDEBUG

/* DEBUG ROUTINES */

#define SOUND_MIXER_CS_GETDBGLEVEL 	_SIOWR('M',120, int)
#define SOUND_MIXER_CS_SETDBGLEVEL 	_SIOWR('M',121, int)
#define SOUND_MIXER_CS_GETDBGMASK 	_SIOWR('M',122, int)
#define SOUND_MIXER_CS_SETDBGMASK 	_SIOWR('M',123, int)

#define SNDCTL_DSP_CS_GETDBGLEVEL 	_SIOWR('P', 50, int)
#define SNDCTL_DSP_CS_SETDBGLEVEL 	_SIOWR('P', 51, int)
#define SNDCTL_DSP_CS_GETDBGMASK 	_SIOWR('P', 52, int)
#define SNDCTL_DSP_CS_SETDBGMASK 	_SIOWR('P', 53, int)

static void printioctl(unsigned int x)
{
    unsigned int i;
    unsigned char vidx;
	/* these values are incorrect for the ac97 driver, fix.
         * Index of mixtable1[] member is Device ID 
         * and must be <= SOUND_MIXER_NRDEVICES.
         * Value of array member is index into s->mix.vol[]
         */
        static const unsigned char mixtable1[SOUND_MIXER_NRDEVICES] = {
                [SOUND_MIXER_PCM]     = 1,   /* voice */
                [SOUND_MIXER_LINE1]   = 2,   /* AUX */
                [SOUND_MIXER_CD]      = 3,   /* CD */
                [SOUND_MIXER_LINE]    = 4,   /* Line */
                [SOUND_MIXER_SYNTH]   = 5,   /* FM */
                [SOUND_MIXER_MIC]     = 6,   /* Mic */
                [SOUND_MIXER_SPEAKER] = 7,   /* Speaker */
                [SOUND_MIXER_RECLEV]  = 8,   /* Recording level */
                [SOUND_MIXER_VOLUME]  = 9    /* Master Volume */
        };
        
    switch(x) 
    {
	case SOUND_MIXER_CS_GETDBGMASK:
		CS_DBGOUT(CS_IOCTL, 4, printk("SOUND_MIXER_CS_GETDBGMASK: ") );
		break;
	case SOUND_MIXER_CS_GETDBGLEVEL:
		CS_DBGOUT(CS_IOCTL, 4, printk("SOUND_MIXER_CS_GETDBGLEVEL: ") );
		break;
	case SOUND_MIXER_CS_SETDBGMASK:
		CS_DBGOUT(CS_IOCTL, 4, printk("SOUND_MIXER_CS_SETDBGMASK: ") );
		break;
	case SOUND_MIXER_CS_SETDBGLEVEL:
		CS_DBGOUT(CS_IOCTL, 4, printk("SOUND_MIXER_CS_SETDBGLEVEL: ") );
		break;
        case OSS_GETVERSION:
		CS_DBGOUT(CS_IOCTL, 4, printk("OSS_GETVERSION: ") );
		break;
        case SNDCTL_DSP_SYNC:
		CS_DBGOUT(CS_IOCTL, 4, printk("SNDCTL_DSP_SYNC: ") );
		break;
        case SNDCTL_DSP_SETDUPLEX:
		CS_DBGOUT(CS_IOCTL, 4, printk("SNDCTL_DSP_SETDUPLEX: ") );
		break;
        case SNDCTL_DSP_GETCAPS:
		CS_DBGOUT(CS_IOCTL, 4, printk("SNDCTL_DSP_GETCAPS: ") );
		break;
        case SNDCTL_DSP_RESET:
		CS_DBGOUT(CS_IOCTL, 4, printk("SNDCTL_DSP_RESET: ") );
		break;
        case SNDCTL_DSP_SPEED:
		CS_DBGOUT(CS_IOCTL, 4, printk("SNDCTL_DSP_SPEED: ") );
		break;
        case SNDCTL_DSP_STEREO:
		CS_DBGOUT(CS_IOCTL, 4, printk("SNDCTL_DSP_STEREO: ") );
		break;
        case SNDCTL_DSP_CHANNELS:
		CS_DBGOUT(CS_IOCTL, 4, printk("SNDCTL_DSP_CHANNELS: ") );
		break;