es1370.c

linux和2410结合开发 用他可以生成2410所需的zImage文件

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

/*
 *      es1370.c  --  Ensoniq ES1370/Asahi Kasei AK4531 audio driver.
 *
 *      Copyright (C) 1998-2001  Thomas Sailer ([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.
 *
 * Special thanks to David C. Niemi
 *
 *
 * Module command line parameters:
 *   joystick if 1 enables the joystick interface on the card; but it still
 *            needs a driver for joysticks connected to a standard IBM-PC
 *	      joyport. It is tested with the joy-analog driver. This 
 *	      module must be loaded before the joystick driver. Kmod will
 *	      not ensure that.
 *   lineout  if 1 the LINE jack is used as an output instead of an input.
 *            LINE then contains the unmixed dsp output. This can be used
 *            to make the card a four channel one: use dsp to output two
 *            channels to LINE and dac to output the other two channels to
 *            SPKR. Set the mixer to only output synth to SPKR.
 *   micbias  sets the +5V bias to the mic if using an electretmic.
 *            
 *
 *  Note: sync mode is not yet supported (i.e. running dsp and dac from the same
 *  clock source)
 *
 *  Supported devices:
 *  /dev/dsp    standard /dev/dsp device, (mostly) OSS compatible
 *  /dev/mixer  standard /dev/mixer device, (mostly) OSS compatible
 *  /dev/dsp1   additional DAC, like /dev/dsp, but output only,
 *              only 5512, 11025, 22050 and 44100 samples/s,
 *              outputs to mixer "SYNTH" setting
 *  /dev/midi   simple MIDI UART interface, no ioctl
 *
 *  NOTE: the card does not have any FM/Wavetable synthesizer, it is supposed
 *  to be done in software. That is what /dev/dac is for. By now (Q2 1998)
 *  there are several MIDI to PCM (WAV) packages, one of them is timidity.
 *
 *  Revision history
 *    26.03.1998   0.1   Initial release
 *    31.03.1998   0.2   Fix bug in GETOSPACE
 *    04.04.1998   0.3   Make it work (again) under 2.0.33
 *                       Fix mixer write operation not returning the actual
 *                       settings
 *    05.04.1998   0.4   First attempt at using the new PCI stuff
 *    29.04.1998   0.5   Fix hang when ^C is pressed on amp
 *    07.05.1998   0.6   Don't double lock around stop_*() in *_release()
 *    10.05.1998   0.7   First stab at a simple midi interface (no bells&whistles)
 *    14.05.1998   0.8   Don't allow excessive interrupt rates
 *    08.06.1998   0.9   First release using Alan Cox' soundcore instead of
 *                       miscdevice
 *    05.07.1998   0.10  Fixed the driver to correctly maintin OSS style volume
 *                       settings (not sure if this should be standard)
 *                       Fixed many references: f_flags should be f_mode
 *                       -- Gerald Britton <[e-mail]>
 *    03.08.1998   0.11  Now mixer behaviour can basically be selected between
 *                       "OSS documented" and "OSS actual" behaviour
 *                       Fixed mixer table thanks to [e-mail]
 *                       On module startup, set DAC2 to 11kSPS instead of 5.5kSPS,
 *                       as it produces an annoying ssssh in the lower sampling rate
 *                       Do not include modversions.h
 *    22.08.1998   0.12  Mixer registers actually have 5 instead of 4 bits
 *                       pointed out by Itai Nahshon
 *    31.08.1998   0.13  Fix realplayer problems - dac.count issues
 *    08.10.1998   0.14  Joystick support fixed
 *		         -- Oliver Neukum <[e-mail]>
 *    10.12.1998   0.15  Fix drain_dac trying to wait on not yet initialized DMA
 *    16.12.1998   0.16  Don't wake up app until there are fragsize bytes to read/write
 *    06.01.1999   0.17  remove the silly SA_INTERRUPT flag.
 *                       hopefully killed the egcs section type conflict
 *    12.03.1999   0.18  cinfo.blocks should be reset after GETxPTR ioctl.
 *                       reported by Johan Maes <[e-mail]>
 *    22.03.1999   0.19  return EAGAIN instead of EBUSY when O_NONBLOCK
 *                       read/write cannot be executed
 *    07.04.1999   0.20  implemented the following ioctl's: SOUND_PCM_READ_RATE, 
 *                       SOUND_PCM_READ_CHANNELS, SOUND_PCM_READ_BITS; 
 *                       Alpha fixes reported by Peter Jones <[e-mail]>
 *                       Note: joystick address handling might still be wrong on archs
 *                       other than i386
 *    10.05.1999   0.21  Added support for an electret mic for SB PCI64
 *                       to the Linux kernel sound driver. This mod also straighten
 *                       out the question marks around the mic impedance setting
 *                       (micz). From [e-mail]
 *    11.05.1999   0.22  Implemented the IMIX call to mute recording monitor.
 *                       Guenter Geiger <[e-mail]>
 *    15.06.1999   0.23  Fix bad allocation bug.
 *                       Thanks to Deti Fliegl <[e-mail]>
 *    28.06.1999   0.24  Add pci_set_master
 *    02.08.1999   0.25  Added workaround for the "phantom write" bug first
 *                       documented by Dave Sharpless from Anchor Games
 *    03.08.1999   0.26  adapt to Linus' new __setup/__initcall
 *                       added kernel command line option "es1370=joystick[,lineout[,micbias]]"
 *                       removed CONFIG_SOUND_ES1370_JOYPORT_BOOT kludge
 *    12.08.1999   0.27  module_init/__setup fixes
 *    19.08.1999   0.28  SOUND_MIXER_IMIX fixes, reported by Gianluca <[e-mail]>
 *    31.08.1999   0.29  add spin_lock_init
 *                       replaced current->state = x with set_current_state(x)
 *    03.09.1999   0.30  change read semantics for MIDI to match
 *                       OSS more closely; remove possible wakeup race
 *    28.10.1999   0.31  More waitqueue races fixed
 *    08.01.2000   0.32  Prevent some ioctl's from returning bad count values on underrun/overrun;
 *                       Tim Janik's BSE (Bedevilled Sound Engine) found this
 *    07.02.2000   0.33  Use pci_alloc_consistent and pci_register_driver
 *    21.11.2000   0.34  Initialize dma buffers in poll, otherwise poll may return a bogus mask
 *    12.12.2000   0.35  More dma buffer initializations, patch from
 *                       Tjeerd Mulder <[e-mail]>
 *    07.01.2001   0.36  Timeout change in wrcodec as requested by Frank Klemm <[e-mail]>
 *    31.01.2001   0.37  Register/Unregister gameport
 *                       Fix SETTRIGGER non OSS API conformity
 *
 * some important things missing in Ensoniq documentation:
 *
 * Experimental PCLKDIV results:  play the same waveforms on both DAC1 and DAC2
 * and vary PCLKDIV to obtain zero beat.
 *  5512sps:  254
 * 44100sps:   30
 * seems to be fs = 1411200/(PCLKDIV+2)
 *
 * should find out when curr_sample_ct is cleared and
 * where exactly the CCB fetches data
 *
 * The card uses a 22.5792 MHz crystal.
 * The LINEIN jack may be converted to an AOUT jack by
 * setting pin 47 (XCTL0) of the ES1370 to high.
 * Pin 48 (XCTL1) of the ES1370 sets the +5V bias for an electretmic
 * 
 *
 */

/*****************************************************************************/
      
#include <linux/version.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/smp_lock.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 <asm/uaccess.h>
#include <asm/hardirq.h>
#include <linux/gameport.h>

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

#undef OSS_DOCUMENTED_MIXER_SEMANTICS
#define DBG(x) {}
/*#define DBG(x) {x}*/

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

#ifndef PCI_VENDOR_ID_ENSONIQ
#define PCI_VENDOR_ID_ENSONIQ        0x1274    
#endif

#ifndef PCI_DEVICE_ID_ENSONIQ_ES1370
#define PCI_DEVICE_ID_ENSONIQ_ES1370 0x5000
#endif

#define ES1370_MAGIC  ((PCI_VENDOR_ID_ENSONIQ<<16)|PCI_DEVICE_ID_ENSONIQ_ES1370)

#define ES1370_EXTENT             0x40
#define JOY_EXTENT                8

#define ES1370_REG_CONTROL        0x00
#define ES1370_REG_STATUS         0x04
#define ES1370_REG_UART_DATA      0x08
#define ES1370_REG_UART_STATUS    0x09
#define ES1370_REG_UART_CONTROL   0x09
#define ES1370_REG_UART_TEST      0x0a
#define ES1370_REG_MEMPAGE        0x0c
#define ES1370_REG_CODEC          0x10
#define ES1370_REG_SERIAL_CONTROL 0x20
#define ES1370_REG_DAC1_SCOUNT    0x24
#define ES1370_REG_DAC2_SCOUNT    0x28
#define ES1370_REG_ADC_SCOUNT     0x2c

#define ES1370_REG_DAC1_FRAMEADR    0xc30
#define ES1370_REG_DAC1_FRAMECNT    0xc34
#define ES1370_REG_DAC2_FRAMEADR    0xc38
#define ES1370_REG_DAC2_FRAMECNT    0xc3c
#define ES1370_REG_ADC_FRAMEADR     0xd30
#define ES1370_REG_ADC_FRAMECNT     0xd34
#define ES1370_REG_PHANTOM_FRAMEADR 0xd38
#define ES1370_REG_PHANTOM_FRAMECNT 0xd3c

#define ES1370_FMT_U8_MONO     0
#define ES1370_FMT_U8_STEREO   1
#define ES1370_FMT_S16_MONO    2
#define ES1370_FMT_S16_STEREO  3
#define ES1370_FMT_STEREO      1
#define ES1370_FMT_S16         2
#define ES1370_FMT_MASK        3

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

static const unsigned dac1_samplerate[] = { 5512, 11025, 22050, 44100 };

#define DAC2_SRTODIV(x) (((1411200+(x)/2)/(x))-2)
#define DAC2_DIVTOSR(x) (1411200/((x)+2))

#define CTRL_ADC_STOP   0x80000000  /* 1 = ADC stopped */
#define CTRL_XCTL1      0x40000000  /* electret mic bias */
#define CTRL_OPEN       0x20000000  /* no function, can be read and written */
#define CTRL_PCLKDIV    0x1fff0000  /* ADC/DAC2 clock divider */
#define CTRL_SH_PCLKDIV 16
#define CTRL_MSFMTSEL   0x00008000  /* MPEG serial data fmt: 0 = Sony, 1 = I2S */
#define CTRL_M_SBB      0x00004000  /* DAC2 clock: 0 = PCLKDIV, 1 = MPEG */
#define CTRL_WTSRSEL    0x00003000  /* DAC1 clock freq: 0=5512, 1=11025, 2=22050, 3=44100 */
#define CTRL_SH_WTSRSEL 12
#define CTRL_DAC_SYNC   0x00000800  /* 1 = DAC2 runs off DAC1 clock */
#define CTRL_CCB_INTRM  0x00000400  /* 1 = CCB "voice" ints enabled */
#define CTRL_M_CB       0x00000200  /* recording source: 0 = ADC, 1 = MPEG */
#define CTRL_XCTL0      0x00000100  /* 0 = Line in, 1 = Line out */
#define CTRL_BREQ       0x00000080  /* 1 = test mode (internal mem test) */
#define CTRL_DAC1_EN    0x00000040  /* enable DAC1 */
#define CTRL_DAC2_EN    0x00000020  /* enable DAC2 */
#define CTRL_ADC_EN     0x00000010  /* enable ADC */
#define CTRL_UART_EN    0x00000008  /* enable MIDI uart */
#define CTRL_JYSTK_EN   0x00000004  /* enable Joystick port (presumably at address 0x200) */
#define CTRL_CDC_EN     0x00000002  /* enable serial (CODEC) interface */
#define CTRL_SERR_DIS   0x00000001  /* 1 = disable PCI SERR signal */

#define STAT_INTR       0x80000000  /* wired or of all interrupt bits */
#define STAT_CSTAT      0x00000400  /* 1 = codec busy or codec write in progress */
#define STAT_CBUSY      0x00000200  /* 1 = codec busy */
#define STAT_CWRIP      0x00000100  /* 1 = codec write in progress */
#define STAT_VC         0x00000060  /* CCB int source, 0=DAC1, 1=DAC2, 2=ADC, 3=undef */
#define STAT_SH_VC      5
#define STAT_MCCB       0x00000010  /* CCB int pending */
#define STAT_UART       0x00000008  /* UART int pending */
#define STAT_DAC1       0x00000004  /* DAC1 int pending */
#define STAT_DAC2       0x00000002  /* DAC2 int pending */
#define STAT_ADC        0x00000001  /* ADC int pending */

#define USTAT_RXINT     0x80        /* UART rx int pending */
#define USTAT_TXINT     0x04        /* UART tx int pending */
#define USTAT_TXRDY     0x02        /* UART tx ready */
#define USTAT_RXRDY     0x01        /* UART rx ready */

#define UCTRL_RXINTEN   0x80        /* 1 = enable RX ints */
#define UCTRL_TXINTEN   0x60        /* TX int enable field mask */
#define UCTRL_ENA_TXINT 0x20        /* enable TX int */
#define UCTRL_CNTRL     0x03        /* control field */
#define UCTRL_CNTRL_SWR 0x03        /* software reset command */

#define SCTRL_P2ENDINC    0x00380000  /*  */
#define SCTRL_SH_P2ENDINC 19
#define SCTRL_P2STINC     0x00070000  /*  */
#define SCTRL_SH_P2STINC  16
#define SCTRL_R1LOOPSEL   0x00008000  /* 0 = loop mode */
#define SCTRL_P2LOOPSEL   0x00004000  /* 0 = loop mode */
#define SCTRL_P1LOOPSEL   0x00002000  /* 0 = loop mode */
#define SCTRL_P2PAUSE     0x00001000  /* 1 = pause mode */
#define SCTRL_P1PAUSE     0x00000800  /* 1 = pause mode */
#define SCTRL_R1INTEN     0x00000400  /* enable interrupt */
#define SCTRL_P2INTEN     0x00000200  /* enable interrupt */
#define SCTRL_P1INTEN     0x00000100  /* enable interrupt */
#define SCTRL_P1SCTRLD    0x00000080  /* reload sample count register for DAC1 */
#define SCTRL_P2DACSEN    0x00000040  /* 1 = DAC2 play back last sample when disabled */
#define SCTRL_R1SEB       0x00000020  /* 1 = 16bit */
#define SCTRL_R1SMB       0x00000010  /* 1 = stereo */
#define SCTRL_R1FMT       0x00000030  /* format mask */
#define SCTRL_SH_R1FMT    4
#define SCTRL_P2SEB       0x00000008  /* 1 = 16bit */
#define SCTRL_P2SMB       0x00000004  /* 1 = stereo */
#define SCTRL_P2FMT       0x0000000c  /* format mask */
#define SCTRL_SH_P2FMT    2
#define SCTRL_P1SEB       0x00000002  /* 1 = 16bit */
#define SCTRL_P1SMB       0x00000001  /* 1 = stereo */
#define SCTRL_P1FMT       0x00000003  /* format mask */
#define SCTRL_SH_P1FMT    0

/* misc stuff */

#define FMODE_DAC         4           /* slight misuse of mode_t */

/* MIDI buffer sizes */

#define MIDIINBUF  256
#define MIDIOUTBUF 256

#define FMODE_MIDI_SHIFT 3
#define FMODE_MIDI_READ  (FMODE_READ << FMODE_MIDI_SHIFT)
#define FMODE_MIDI_WRITE (FMODE_WRITE << FMODE_MIDI_SHIFT)

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

struct es1370_state {
	/* magic */
	unsigned int magic;

	/* list of es1370 devices */
	struct list_head devs;

	/* the corresponding pci_dev structure */
	struct pci_dev *dev;

	/* soundcore stuff */
	int dev_audio;
	int dev_mixer;
	int dev_dac;
	int dev_midi;
	
	/* hardware resources */
	unsigned long io; /* long for SPARC */
	unsigned int irq;

	/* mixer registers; there is no HW readback */
	struct {
		unsigned short vol[10];
		unsigned int recsrc;
		unsigned int modcnt;
		unsigned short micpreamp;
	        unsigned int imix;
	} mix;

	/* wave stuff */
	unsigned ctrl;
	unsigned sctrl;

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

	struct dmabuf {
		void *rawbuf;
		dma_addr_t dmaaddr;
		unsigned buforder;
		unsigned numfrag;
		unsigned fragshift;
		unsigned hwptr, swptr;
		unsigned total_bytes;
		int count;
		unsigned error; /* over/underrun */
		wait_queue_head_t wait;
		/* redundant, but makes calculations easier */
		unsigned fragsize;
		unsigned dmasize;
		unsigned fragsamples;
		/* OSS stuff */
		unsigned mapped:1;
		unsigned ready:1;
		unsigned endcleared:1;
		unsigned enabled:1;
		unsigned ossfragshift;
		int ossmaxfrags;
		unsigned subdivision;
	} dma_dac1, dma_dac2, dma_adc;

	/* midi stuff */
	struct {
		unsigned ird, iwr, icnt;
		unsigned ord, owr, ocnt;
		wait_queue_head_t iwait;
		wait_queue_head_t owait;
		unsigned char ibuf[MIDIINBUF];
		unsigned char obuf[MIDIOUTBUF];
	} midi;

	struct gameport gameport;
	struct semaphore sem;
};

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

static LIST_HEAD(devs);

/*
 * The following buffer is used to point the phantom write channel to,
 * so that it cannot wreak havoc. The attribute makes sure it doesn't
 * cross a page boundary and ensures dword alignment for the DMA engine
 */
static unsigned char bugbuf[16] __attribute__ ((aligned (16)));

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

static 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;