cmpci.c

linux和2410结合开发 用他可以生成2410所需的zImage文件

/*****************************************************************************/
/*
 *      cmpci.c  --  C-Media PCI audio driver.
 *
 *      Copyright (C) 1999  ChenLi Tien ([e-mail])
 *      		    C-media support ([e-mail])
 *
 *      Based on the PCI drivers by Thomas Sailer ([e-mail])
 *
 * 	For update, visit:
 * 		http://members.home.net/puresoft/cmedia.html
 * 		http://www.cmedia.com.tw
 * 	
 *      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.
 *
 * Special thanks to David C. Niemi, Jan Pfeifer
 *
 *
 * Module command line parameters:
 *   none so far
 *
 *
 *  Supported devices:
 *  /dev/dsp    standard /dev/dsp device, (mostly) OSS compatible
 *  /dev/mixer  standard /dev/mixer device, (mostly) OSS compatible
 *  /dev/midi   simple MIDI UART interface, no ioctl
 *
 *  The card has both an FM and a Wavetable synth, but I have to figure
 *  out first how to drive them...
 *
 *  Revision history
 *    06.05.98   0.1   Initial release
 *    10.05.98   0.2   Fixed many bugs, esp. ADC rate calculation
 *                     First stab at a simple midi interface (no bells&whistles)
 *    13.05.98   0.3   Fix stupid cut&paste error: set_adc_rate was called instead of
 *                     set_dac_rate in the FMODE_WRITE case in cm_open
 *                     Fix hwptr out of bounds (now mpg123 works)
 *    14.05.98   0.4   Don't allow excessive interrupt rates
 *    08.06.98   0.5   First release using Alan Cox' soundcore instead of miscdevice
 *    03.08.98   0.6   Do not include modversions.h
 *                     Now mixer behaviour can basically be selected between
 *                     "OSS documented" and "OSS actual" behaviour
 *    31.08.98   0.7   Fix realplayer problems - dac.count issues
 *    10.12.98   0.8   Fix drain_dac trying to wait on not yet initialized DMA
 *    16.12.98   0.9   Fix a few f_file & FMODE_ bugs
 *    06.01.99   0.10  remove the silly SA_INTERRUPT flag.
 *                     hopefully killed the egcs section type conflict
 *    12.03.99   0.11  cinfo.blocks should be reset after GETxPTR ioctl.
 *                     reported by Johan Maes <[e-mail]>
 *    22.03.99   0.12  return EAGAIN instead of EBUSY when O_NONBLOCK
 *                     read/write cannot be executed
 *    18.08.99   1.5   Only deallocate DMA buffer when unloading.
 *    02.09.99   1.6   Enable SPDIF LOOP
 *                     Change the mixer read back
 *    21.09.99   2.33  Use RCS version as driver version.
 *                     Add support for modem, S/PDIF loop and 4 channels.
 *                     (8738 only)
 *                     Fix bug cause x11amp cannot play.
 *
 *    Fixes:
 *    Arnaldo Carvalho de Melo <[e-mail]>
 *    18/05/2001 - .bss nitpicks, fix a bug in set_dac_channels where it
 *    		   was calling prog_dmabuf with s->lock held, call missing
 *    		   unlock_kernel in cm_midi_release
 *    08/10/2001 - use set_current_state in some more places
 *
 *	Carlos Eduardo Gorges <[e-mail]>
 *	Fri May 25 2001 
 *	- SMP support ( spin[un]lock* revision )
 *	- speaker mixer support 
 *	Mon Aug 13 2001
 *	- optimizations and cleanups
 *
 */
/*****************************************************************************/
      
#include <linux/version.h>
#include <linux/config.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/ioport.h>
#include <linux/sched.h>
#include <linux/delay.h>
#include <linux/sound.h>
#include <linux/slab.h>
#include <linux/soundcard.h>
#include <linux/pci.h>
#include <linux/wrapper.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <linux/init.h>
#include <linux/poll.h>
#include <linux/spinlock.h>
#include <linux/smp_lock.h>
#include <asm/uaccess.h>
#include <asm/hardirq.h>
#include <linux/bitops.h>

#include "dm.h"

/* --------------------------------------------------------------------- */
#undef OSS_DOCUMENTED_MIXER_SEMANTICS
#undef DMABYTEIO
/* --------------------------------------------------------------------- */

#define CM_MAGIC  ((PCI_VENDOR_ID_CMEDIA<<16)|PCI_DEVICE_ID_CMEDIA_CM8338A)

/* CM8338 registers definition ****************/

#define CODEC_CMI_FUNCTRL0		(0x00)
#define CODEC_CMI_FUNCTRL1		(0x04)
#define CODEC_CMI_CHFORMAT		(0x08)
#define CODEC_CMI_INT_HLDCLR		(0x0C)
#define CODEC_CMI_INT_STATUS		(0x10)
#define CODEC_CMI_LEGACY_CTRL		(0x14)
#define CODEC_CMI_MISC_CTRL		(0x18)
#define CODEC_CMI_TDMA_POS		(0x1C)
#define CODEC_CMI_MIXER			(0x20)
#define CODEC_SB16_DATA			(0x22)
#define CODEC_SB16_ADDR			(0x23)
#define CODEC_CMI_MIXER1		(0x24)
#define CODEC_CMI_MIXER2		(0x25)
#define CODEC_CMI_AUX_VOL		(0x26)
#define CODEC_CMI_MISC			(0x27)
#define CODEC_CMI_AC97			(0x28)

#define CODEC_CMI_CH0_FRAME1		(0x80)
#define CODEC_CMI_CH0_FRAME2		(0x84)
#define CODEC_CMI_CH1_FRAME1		(0x88)
#define CODEC_CMI_CH1_FRAME2		(0x8C)

#define CODEC_CMI_EXT_REG		(0xF0)

/*  Mixer registers for SB16 ******************/

#define DSP_MIX_DATARESETIDX		((unsigned char)(0x00))

#define DSP_MIX_MASTERVOLIDX_L		((unsigned char)(0x30))
#define DSP_MIX_MASTERVOLIDX_R		((unsigned char)(0x31))
#define DSP_MIX_VOICEVOLIDX_L		((unsigned char)(0x32))
#define DSP_MIX_VOICEVOLIDX_R		((unsigned char)(0x33))
#define DSP_MIX_FMVOLIDX_L		((unsigned char)(0x34))
#define DSP_MIX_FMVOLIDX_R		((unsigned char)(0x35))
#define DSP_MIX_CDVOLIDX_L		((unsigned char)(0x36))
#define DSP_MIX_CDVOLIDX_R		((unsigned char)(0x37))
#define DSP_MIX_LINEVOLIDX_L		((unsigned char)(0x38))
#define DSP_MIX_LINEVOLIDX_R		((unsigned char)(0x39))

#define DSP_MIX_MICVOLIDX		((unsigned char)(0x3A))
#define DSP_MIX_SPKRVOLIDX		((unsigned char)(0x3B))

#define DSP_MIX_OUTMIXIDX		((unsigned char)(0x3C))

#define DSP_MIX_ADCMIXIDX_L		((unsigned char)(0x3D))
#define DSP_MIX_ADCMIXIDX_R		((unsigned char)(0x3E))

#define DSP_MIX_INGAINIDX_L		((unsigned char)(0x3F))
#define DSP_MIX_INGAINIDX_R		((unsigned char)(0x40))
#define DSP_MIX_OUTGAINIDX_L		((unsigned char)(0x41))
#define DSP_MIX_OUTGAINIDX_R		((unsigned char)(0x42))

#define DSP_MIX_AGCIDX			((unsigned char)(0x43))

#define DSP_MIX_TREBLEIDX_L		((unsigned char)(0x44))
#define DSP_MIX_TREBLEIDX_R		((unsigned char)(0x45))
#define DSP_MIX_BASSIDX_L		((unsigned char)(0x46))
#define DSP_MIX_BASSIDX_R		((unsigned char)(0x47))

#define CM_CH0_RESET			0x04
#define CM_CH1_RESET			0x08
#define CM_EXTENT_CODEC			0x100
#define CM_EXTENT_MIDI			0x2
#define CM_EXTENT_SYNTH			0x4
#define CM_INT_CH0			1
#define CM_INT_CH1			2

#define CM_CFMT_STEREO			0x01
#define CM_CFMT_16BIT			0x02
#define CM_CFMT_MASK			0x03
#define CM_CFMT_DACSHIFT		2
#define CM_CFMT_ADCSHIFT		0

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

#define CM_ENABLE_CH1      0x2
#define CM_ENABLE_CH0      0x1

/* MIDI buffer sizes **************************/

#define MIDIINBUF  256
#define MIDIOUTBUF 256

#define FMODE_MIDI_SHIFT 2
#define FMODE_MIDI_READ  (FMODE_READ << FMODE_MIDI_SHIFT)
#define FMODE_MIDI_WRITE (FMODE_WRITE << FMODE_MIDI_SHIFT)

#define FMODE_DMFM 0x10

#define SND_DEV_DSP16   5 

#define NR_DEVICE 3		/* maximum number of devices */

/*********************************************/

struct cm_state {
	unsigned int magic;		/* magic */
	struct cm_state *next;		/* we keep cm cards in a linked list */

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

	unsigned int iosb, iobase, iosynth,
			 iomidi, iogame, irq;	/* hardware resources */
	unsigned short deviceid;		/* pci_id */

        struct {				/* mixer stuff */
                unsigned int modcnt;
		unsigned short vol[13];
        } mix;

	unsigned int rateadc, ratedac;		/* wave stuff */
	unsigned char fmt, enable;

	spinlock_t lock;
	struct semaphore open_sem;
	mode_t open_mode;
	wait_queue_head_t open_wait;

	struct dmabuf {
		void *rawbuf;
		unsigned rawphys;
		unsigned buforder;
		unsigned numfrag;
		unsigned fragshift;
		unsigned hwptr, swptr;
		unsigned total_bytes;
		int count;
		unsigned error;		/* over/underrun */
		wait_queue_head_t wait;
		
		unsigned fragsize;	/* redundant, but makes calculations easier */
		unsigned dmasize;
		unsigned fragsamples;
		unsigned dmasamples;
		
		unsigned mapped:1;	/* OSS stuff */
		unsigned ready:1;
		unsigned endcleared:1;
		unsigned ossfragshift;
		int ossmaxfrags;
		unsigned subdivision;
	} dma_dac, dma_adc;

	struct {			/* midi stuff */
		unsigned ird, iwr, icnt;
		unsigned ord, owr, ocnt;
		wait_queue_head_t iwait;
		wait_queue_head_t owait;
		struct timer_list timer;
		unsigned char ibuf[MIDIINBUF];
		unsigned char obuf[MIDIOUTBUF];
	} midi;
	
	int	chip_version;		
	int	max_channels;
	int	curr_channels;		
	int	speakers;		/* number of speakers */
	int	capability;		/* HW capability, various for chip versions */

	int	status;			/* HW or SW state */
	
	int	spdif_counter;		/* spdif frame counter */
};

/* flags used for capability */
#define	CAN_AC3_HW		0x00000001		/* 037 or later */
#define	CAN_AC3_SW		0x00000002		/* 033 or later */
#define	CAN_AC3			(CAN_AC3_HW | CAN_AC3_SW)
#define CAN_DUAL_DAC		0x00000004		/* 033 or later */
#define	CAN_MULTI_CH_HW		0x00000008		/* 039 or later */
#define	CAN_MULTI_CH		(CAN_MULTI_CH_HW | CAN_DUAL_DAC)
#define	CAN_LINE_AS_REAR	0x00000010		/* 033 or later */
#define	CAN_LINE_AS_BASS	0x00000020		/* 039 or later */
#define	CAN_MIC_AS_BASS		0x00000040		/* 039 or later */

/* flags used for status */
#define	DO_AC3_HW		0x00000001
#define	DO_AC3_SW		0x00000002
#define	DO_AC3			(DO_AC3_HW | DO_AC3_SW)
#define	DO_DUAL_DAC		0x00000004
#define	DO_MULTI_CH_HW		0x00000008
#define	DO_MULTI_CH		(DO_MULTI_CH_HW | DO_DUAL_DAC)
#define	DO_LINE_AS_REAR		0x00000010		/* 033 or later */
#define	DO_LINE_AS_BASS		0x00000020		/* 039 or later */
#define	DO_MIC_AS_BASS		0x00000040		/* 039 or later */
#define	DO_SPDIF_OUT		0x00000100
#define	DO_SPDIF_IN		0x00000200
#define	DO_SPDIF_LOOP		0x00000400

static struct cm_state *devs;
static unsigned long wavetable_mem;

/* --------------------------------------------------------------------- */

static inline unsigned ld2(unsigned int x)
{
	unsigned exp=16,l=5,r=0;
	static const unsigned num[]={0x2,0x4,0x10,0x100,0x10000};

	/* num: 2, 4, 16, 256, 65536 */
	/* exp: 1, 2,  4,   8,    16 */
	
	while(l--) {
		if( x >= num[l] ) {
			if(num[l]>2) x >>= exp;
			r+=exp;
		}
		exp>>=1;
	}

	return r;
}

/* --------------------------------------------------------------------- */

static void maskb(unsigned int addr, unsigned int mask, unsigned int value)
{
	outb((inb(addr) & mask) | value, addr);
}

static void maskw(unsigned int addr, unsigned int mask, unsigned int value)
{
	outw((inw(addr) & mask) | value, addr);
}

static void maskl(unsigned int addr, unsigned int mask, unsigned int value)
{
	outl((inl(addr) & mask) | value, addr);
}

static void set_dmadac1(struct cm_state *s, unsigned int addr, unsigned int count)
{
	if (addr)
	    outl(addr, s->iobase + CODEC_CMI_CH0_FRAME1);
	outw(count - 1, s->iobase + CODEC_CMI_CH0_FRAME2);
	maskb(s->iobase + CODEC_CMI_FUNCTRL0, ~1, 0);
}

static void set_dmaadc(struct cm_state *s, unsigned int addr, unsigned int count)
{
	outl(addr, s->iobase + CODEC_CMI_CH0_FRAME1);
	outw(count - 1, s->iobase + CODEC_CMI_CH0_FRAME2);
	maskb(s->iobase + CODEC_CMI_FUNCTRL0, ~0, 1);
}

static void set_dmadac(struct cm_state *s, unsigned int addr, unsigned int count)
{
	outl(addr, s->iobase + CODEC_CMI_CH1_FRAME1);
	outw(count - 1, s->iobase + CODEC_CMI_CH1_FRAME2);
	maskb(s->iobase + CODEC_CMI_FUNCTRL0, ~2, 0);
	if (s->status & DO_DUAL_DAC)
		set_dmadac1(s, 0, count);
}

static void set_countadc(struct cm_state *s, unsigned count)
{
	outw(count - 1, s->iobase + CODEC_CMI_CH0_FRAME2 + 2);
}

static void set_countdac(struct cm_state *s, unsigned count)
{
	outw(count - 1, s->iobase + CODEC_CMI_CH1_FRAME2 + 2);
	if (s->status & DO_DUAL_DAC)
	    set_countadc(s, count);
}

static inline unsigned get_dmadac(struct cm_state *s)
{
	unsigned int curr_addr;

	curr_addr = inw(s->iobase + CODEC_CMI_CH1_FRAME2) + 1;
	curr_addr <<= sample_shift[(s->fmt >> CM_CFMT_DACSHIFT) & CM_CFMT_MASK];
	curr_addr = s->dma_dac.dmasize - curr_addr;

	return curr_addr;
}

static inline unsigned get_dmaadc(struct cm_state *s)
{
	unsigned int curr_addr;

	curr_addr = inw(s->iobase + CODEC_CMI_CH0_FRAME2) + 1;
	curr_addr <<= sample_shift[(s->fmt >> CM_CFMT_ADCSHIFT) & CM_CFMT_MASK];
	curr_addr = s->dma_adc.dmasize - curr_addr;

	return curr_addr;
}

static void wrmixer(struct cm_state *s, unsigned char idx, unsigned char data)
{
	outb(idx, s->iobase + CODEC_SB16_ADDR);
	udelay(10);
	outb(data, s->iobase + CODEC_SB16_DATA);
	udelay(10);
}

static unsigned char rdmixer(struct cm_state *s, unsigned char idx)
{
	unsigned char v;
	unsigned long flags;
	
	spin_lock_irqsave(&s->lock, flags);
	outb(idx, s->iobase + CODEC_SB16_ADDR);
	udelay(10);
	v = inb(s->iobase + CODEC_SB16_DATA);
	udelay(10);
	spin_unlock_irqrestore(&s->lock, flags);
	return v;
}

static void set_fmt_unlocked(struct cm_state *s, unsigned char mask, unsigned char data)
{
	if (mask)
	{
		s->fmt = inb(s->iobase + CODEC_CMI_CHFORMAT);
		udelay(10);
	}
	s->fmt = (s->fmt & mask) | data;
	outb(s->fmt, s->iobase + CODEC_CMI_CHFORMAT);
	udelay(10);
}