ite8172.c

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/*
 *      ite8172.c  --  ITE IT8172G Sound Driver.
 *
 * Copyright 2001 MontaVista Software Inc.
 * Author: MontaVista Software, Inc.
 *         	[e-mail] or [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  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
 *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
 *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
 *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *  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.
 *
 *
 * Module command line parameters:
 *
 *  Supported devices:
 *  /dev/dsp    standard OSS /dev/dsp device
 *  /dev/mixer  standard OSS /dev/mixer device
 *
 * Notes:
 *
 *  1. Much of the OSS buffer allocation, ioctl's, and mmap'ing are
 *     taken, slightly modified or not at all, from the ES1371 driver,
 *     so refer to the credits in es1371.c for those. The rest of the
 *     code (probe, open, read, write, the ISR, etc.) is new.
 *  2. The following support is untested:
 *      * Memory mapping the audio buffers, and the ioctl controls that go
 *        with it.
 *      * S/PDIF output.
 *      * I2S support.
 *  3. The following is not supported:
 *      * legacy audio mode.
 *  4. Support for volume button interrupts is implemented but doesn't
 *     work yet.
 *
 *  Revision history
 *    02.08.2001  Initial release
 *    06.22.2001  Added I2S support
 *    07.30.2003  Removed initialisation to zero for static variables
 *		   (spdif[NR_DEVICE], i2s_fmt[NR_DEVICE], and devindex)
 */
#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/init.h>
#include <linux/poll.h>
#include <linux/bitops.h>
#include <linux/proc_fs.h>
#include <linux/spinlock.h>
#include <linux/smp_lock.h>
#include <linux/ac97_codec.h>
#include <linux/interrupt.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <asm/uaccess.h>
#include <asm/it8172/it8172.h>

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

#undef OSS_DOCUMENTED_MIXER_SEMANTICS
#define IT8172_DEBUG
#undef IT8172_VERBOSE_DEBUG
#define DBG(x) {}

#define IT8172_MODULE_NAME "IT8172 audio"
#define PFX IT8172_MODULE_NAME

#ifdef IT8172_DEBUG
#define dbg(format, arg...) printk(KERN_DEBUG PFX ": " format "\n" , ## arg)
#else
#define dbg(format, arg...) do {} while (0)
#endif
#define err(format, arg...) printk(KERN_ERR PFX ": " format "\n" , ## arg)
#define info(format, arg...) printk(KERN_INFO PFX ": " format "\n" , ## arg)
#define warn(format, arg...) printk(KERN_WARNING PFX ": " format "\n" , ## arg)


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


/*
 * Audio Controller register bit definitions follow. See
 * include/asm/it8172/it8172.h for register offsets.
 */

/* PCM Out Volume Reg */
#define PCMOV_PCMOM	(1<<15)	/* PCM Out Mute default 1: mute */
#define	PCMOV_PCMRCG_BIT 8	/* PCM Right channel Gain */
#define	PCMOV_PCMRCG_MASK (0x1f<<PCMOV_PCMRCG_BIT)
#define PCMOV_PCMLCG_BIT 0	/* PCM Left channel gain  */
#define PCMOV_PCMLCG_MASK 0x1f

/* FM Out Volume Reg */
#define FMOV_FMOM       (1<<15)	/* FM Out Mute default 1: mute */
#define	FMOV_FMRCG_BIT	8	/* FM Right channel Gain */
#define	FMOV_FMRCG_MASK (0x1f<<FMOV_FMRCG_BIT)
#define FMOV_FMLCG_BIT	0	/* FM Left channel gain  */
#define FMOV_FMLCG_MASK 0x1f

/* I2S Out Volume Reg */
#define I2SV_I2SOM	 (1<<15) /* I2S Out Mute default 1: mute */
#define	I2SV_I2SRCG_BIT	 8	 /* I2S Right channel Gain */
#define	I2SV_I2SRCG_MASK (0x1f<<I2SV_I2SRCG_BIT)
#define I2SV_I2SLCG_BIT	 0	 /* I2S Left channel gain  */
#define I2SV_I2SLCG_MASK 0x1f

/* Digital Recording Source Select Reg */
#define	DRSS_BIT   0
#define	DRSS_MASK  0x07
#define   DRSS_AC97_PRIM 0
#define   DRSS_FM        1
#define   DRSS_I2S       2
#define   DRSS_PCM       3
#define   DRSS_AC97_SEC  4

/* Playback/Capture Channel Control Registers */
#define	CC_SM	        (1<<15)	/* Stereo, Mone 0: mono 1: stereo */
#define	CC_DF	        (1<<14)	/* Data Format 0: 8 bit 1: 16 bit */
#define CC_FMT_BIT      14
#define CC_FMT_MASK     (0x03<<CC_FMT_BIT)
#define CC_CF_BIT       12      /* Channel format (Playback only) */
#define CC_CF_MASK      (0x03<<CC_CF_BIT)
#define	  CC_CF_2	0
#define   CC_CF_4	(1<<CC_CF_BIT)
#define   CC_CF_6	(2<<CC_CF_BIT)
#define CC_SR_BIT       8       /* sample Rate */
#define CC_SR_MASK      (0x0f<<CC_SR_BIT)
#define	  CC_SR_5500	0
#define	  CC_SR_8000	(1<<CC_SR_BIT)
#define	  CC_SR_9600	(2<<CC_SR_BIT)
#define	  CC_SR_11025	(3<<CC_SR_BIT)
#define	  CC_SR_16000	(4<<CC_SR_BIT)
#define	  CC_SR_19200	(5<<CC_SR_BIT)
#define	  CC_SR_22050	(6<<CC_SR_BIT)
#define	  CC_SR_32000	(7<<CC_SR_BIT)
#define	  CC_SR_38400	(8<<CC_SR_BIT)
#define	  CC_SR_44100	(9<<CC_SR_BIT)
#define	  CC_SR_48000	(10<<CC_SR_BIT)
#define	CC_CSP	        (1<<7)	/* Channel stop 
				 * 0: End of Current buffer
				 * 1: Immediately stop when rec stop */
#define CC_CP	        (1<<6)	/* Channel pause 0: normal, 1: pause */
#define	CC_CA	        (1<<5)	/* Channel Action 0: Stop , 1: start */
#define	CC_CB2L         (1<<2)	/* Cur. buf. 2 xfr is last 0: No, 1: Yes */
#define CC_CB1L         (1<<1)	/* Cur. buf. 1 xfr is last 0: No, 1: Yes */
#define CC_DE	        1	/* DFC/DFIFO Data Empty 1: empty, 0: not empty
				 * (Playback only)
				 */

/* Codec Control Reg */
#define CODECC_GME	(1<<9)	/* AC97 GPIO Mode enable */
#define	CODECC_ATM	(1<<8)	/* AC97 ATE test mode 0: test 1: normal */
#define	CODECC_WR	(1<<6)	/* AC97 Warn reset 1: warm reset , 0: Normal */
#define	CODECC_CR	(1<<5)	/* AC97 Cold reset 1: Cold reset , 0: Normal */


/* I2S Control Reg	*/
#define	I2SMC_SR_BIT	 6	/* I2S Sampling rate 
				 * 00: 48KHz, 01: 44.1 KHz, 10: 32 32 KHz */
#define	I2SMC_SR_MASK    (0x03<<I2SMC_SR_BIT)
#define	  I2SMC_SR_48000 0
#define	  I2SMC_SR_44100 (1<<I2SMC_SR_BIT)
#define	  I2SMC_SR_32000 (2<<I2SMC_SR_BIT)
#define	I2SMC_SRSS	 (1<<5)	/* Sample Rate Source Select 1:S/W, 0: H/W */
#define I2SMC_I2SF_BIT	 0	/* I2S Format */
#define I2SMC_I2SF_MASK  0x03
#define   I2SMC_I2SF_DAC 0
#define   I2SMC_I2SF_ADC 2
#define   I2SMC_I2SF_I2S 3


/* Volume up, Down, Mute */
#define	VS_VMP	(1<<2)	/* Volume mute 1: pushed, 0: not */
#define	VS_VDP	(1<<1)	/* Volume Down 1: pushed, 0: not */
#define VS_VUP	1	/* Volime Up 1: pushed, 0: not */

/* SRC, Mixer test control/DFC status reg */
#define SRCS_DPUSC      (1<<5)	/* DFC Playback underrun Status/clear */
#define	SRCS_DCOSC	(1<<4)	/* DFC Capture Overrun Status/clear */
#define SRCS_SIS	(1<<3)	/* SRC input select 1: Mixer, 0: Codec I/F */
#define SRCS_CDIS_BIT	0	/* Codec Data Input Select */
#define SRCS_CDIS_MASK  0x07
#define   SRCS_CDIS_MIXER 0
#define   SRCS_CDIS_PCM   1
#define   SRCS_CDIS_I2S   2
#define   SRCS_CDIS_FM    3
#define   SRCS_CDIS_DFC   4


/* Codec Index Reg command Port */
#define CIRCP_CID_BIT   10
#define CIRCP_CID_MASK  (0x03<<CIRCP_CID_BIT)
#define CIRCP_CPS	(1<<9)	/* Command Port Status 0: ready, 1: busy */
#define	CIRCP_DPVF	(1<<8)	/* Data Port Valid Flag 0: invalis, 1: valid */
#define CIRCP_RWC	(1<<7)	/* Read/write command */
#define CIRCP_CIA_BIT   0
#define CIRCP_CIA_MASK  0x007F	/* Codec Index Address */

/* Test Mode Control/Test group Select Control */

/* General Control Reg */
#define GC_VDC_BIT	6	/* Volume Division Control */
#define GC_VDC_MASK     (0x03<<GC_VDC_BIT)
#define   GC_VDC_NONE   0
#define   GC_VDC_DIV2   (1<<GC_VDC_BIT)
#define   GC_VDC_DIV4   (2<<GC_VDC_BIT)
#define	GC_SOE	        (1<<2)	/* S/PDIF Output enable */
#define	GC_SWR	        1	/* Software warn reset */

/* Interrupt mask Control Reg */
#define	IMC_VCIM	(1<<6)	/* Volume CNTL interrupt mask */
#define	IMC_CCIM	(1<<1)	/* Capture Chan. iterrupt mask */
#define	IMC_PCIM	1	/* Playback Chan. interrupt mask */

/* Interrupt status/clear reg */
#define	ISC_VCI	        (1<<6)	/* Volume CNTL interrupt 1: clears */
#define	ISC_CCI	        (1<<1)	/* Capture Chan. interrupt 1: clears  */
#define	ISC_PCI	        1	/* Playback Chan. interrupt 1: clears */

/* misc stuff */
#define POLL_COUNT   0x5000


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

/*
 * Define DIGITAL1 as the I2S channel, since it is not listed in
 * soundcard.h.
 */
#define SOUND_MIXER_I2S        SOUND_MIXER_DIGITAL1
#define SOUND_MASK_I2S         SOUND_MASK_DIGITAL1
#define SOUND_MIXER_READ_I2S   MIXER_READ(SOUND_MIXER_I2S)
#define SOUND_MIXER_WRITE_I2S  MIXER_WRITE(SOUND_MIXER_I2S)

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

struct it8172_state {
	/* list of it8172 devices */
	struct list_head devs;

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

	/* soundcore stuff */
	int dev_audio;

	/* hardware resources */
	unsigned long io;
	unsigned int irq;

	/* PCI ID's */
	u16 vendor;
	u16 device;
	u8 rev; /* the chip revision */

	/* options */
	int spdif_volume; /* S/PDIF output is enabled if != -1 */
	int i2s_volume;   /* current I2S out volume, in OSS format */
	int i2s_recording;/* 1 = recording from I2S, 0 = not */
    
#ifdef IT8172_DEBUG
	/* debug /proc entry */
	struct proc_dir_entry *ps;
	struct proc_dir_entry *ac97_ps;
#endif /* IT8172_DEBUG */

	struct ac97_codec *codec;

	unsigned short pcc, capcc;
	unsigned dacrate, adcrate;

	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;
		void* nextIn;
		void* nextOut;
		int count;
		int curBufPtr;
		unsigned total_bytes;
		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 stopped:1;
		unsigned ossfragshift;
		int ossmaxfrags;
		unsigned subdivision;
	} dma_dac, dma_adc;
};

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

static LIST_HEAD(devs);

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

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;
		r += 4;
	}
	if (x >= 4) {
		x >>= 2;
		r += 2;
	}
	if (x >= 2)
		r++;
	return r;
}

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

static void it8172_delay(int msec)
{
	unsigned long tmo;
	signed long tmo2;

	if (in_interrupt())
		return;
    
	tmo = jiffies + (msec*HZ)/1000;
	for (;;) {
		tmo2 = tmo - jiffies;
		if (tmo2 <= 0)
			break;
		schedule_timeout(tmo2);
	}
}


static unsigned short
get_compat_rate(unsigned* rate)
{
	unsigned rate_out = *rate;
	unsigned short sr;
    
	if (rate_out >= 46050) {
		sr = CC_SR_48000; rate_out = 48000;
	} else if (rate_out >= 41250) {
		sr = CC_SR_44100; rate_out = 44100;
	} else if (rate_out >= 35200) {
		sr = CC_SR_38400; rate_out = 38400;
	} else if (rate_out >= 27025) {
		sr = CC_SR_32000; rate_out = 32000;
	} else if (rate_out >= 20625) {
		sr = CC_SR_22050; rate_out = 22050;
	} else if (rate_out >= 17600) {
		sr = CC_SR_19200; rate_out = 19200;
	} else if (rate_out >= 13513) {
		sr = CC_SR_16000; rate_out = 16000;
	} else if (rate_out >= 10313) {
		sr = CC_SR_11025; rate_out = 11025;
	} else if (rate_out >= 8800) {
		sr = CC_SR_9600; rate_out = 9600;
	} else if (rate_out >= 6750) {
		sr = CC_SR_8000; rate_out = 8000;
	} else {
		sr = CC_SR_5500; rate_out = 5500;
	}

	*rate = rate_out;
	return sr;
}

static void set_adc_rate(struct it8172_state *s, unsigned rate)
{
	unsigned long flags;
	unsigned short sr;
    
	sr = get_compat_rate(&rate);

	spin_lock_irqsave(&s->lock, flags);
	s->capcc &= ~CC_SR_MASK;
	s->capcc |= sr;
	outw(s->capcc, s->io+IT_AC_CAPCC);
	spin_unlock_irqrestore(&s->lock, flags);

	s->adcrate = rate;
}


static void set_dac_rate(struct it8172_state *s, unsigned rate)
{
	unsigned long flags;
	unsigned short sr;
    
	sr = get_compat_rate(&rate);

	spin_lock_irqsave(&s->lock, flags);
	s->pcc &= ~CC_SR_MASK;
	s->pcc |= sr;
	outw(s->pcc, s->io+IT_AC_PCC);
	spin_unlock_irqrestore(&s->lock, flags);

	s->dacrate = rate;
}


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

static u16 rdcodec(struct ac97_codec *codec, u8 addr)
{
	struct it8172_state *s = (struct it8172_state *)codec->private_data;
	unsigned long flags;
	unsigned short circp, data;
	int i;
    
	spin_lock_irqsave(&s->lock, flags);

	for (i = 0; i < POLL_COUNT; i++)
		if (!(inw(s->io+IT_AC_CIRCP) & CIRCP_CPS))
			break;
	if (i == POLL_COUNT)
		err("rdcodec: codec ready poll expired!");

	circp = addr & CIRCP_CIA_MASK;
	circp |= (codec->id << CIRCP_CID_BIT);
	circp |= CIRCP_RWC; // read command
	outw(circp, s->io+IT_AC_CIRCP);

	/* now wait for the data */
	for (i = 0; i < POLL_COUNT; i++)
		if (inw(s->io+IT_AC_CIRCP) & CIRCP_DPVF)
			break;
	if (i == POLL_COUNT)
		err("rdcodec: read poll expired!");

	data = inw(s->io+IT_AC_CIRDP);
	spin_unlock_irqrestore(&s->lock, flags);

	return data;
}


static void wrcodec(struct ac97_codec *codec, u8 addr, u16 data)
{
	struct it8172_state *s = (struct it8172_state *)codec->private_data;
	unsigned long flags;
	unsigned short circp;
	int i;
    
	spin_lock_irqsave(&s->lock, flags);

	for (i = 0; i < POLL_COUNT; i++)
		if (!(inw(s->io+IT_AC_CIRCP) & CIRCP_CPS))
			break;
	if (i == POLL_COUNT)
		err("wrcodec: codec ready poll expired!");

	circp = addr & CIRCP_CIA_MASK;
	circp |= (codec->id << CIRCP_CID_BIT);
	circp &= ~CIRCP_RWC; // write command

	outw(data,  s->io+IT_AC_CIRDP);  // send data first
	outw(circp, s->io+IT_AC_CIRCP);

	spin_unlock_irqrestore(&s->lock, flags);
}


static void waitcodec(struct ac97_codec *codec)
{
	unsigned short temp;

	/* codec_wait is used to wait for a ready state after
	   an AC97_RESET. */
	it8172_delay(10);

	temp = rdcodec(codec, 0x26);

	// If power down, power up
	if (temp & 0x3f00) {
		// Power on
		wrcodec(codec, 0x26, 0);
		it8172_delay(100);
		// Reread
		temp = rdcodec(codec, 0x26);
	}
    
	// Check if Codec REF,ANL,DAC,ADC ready***/
	if ((temp & 0x3f0f) != 0x000f) {
		err("codec reg 26 status (0x%x) not ready!!", temp);
		return;
	}
}


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

static inline void stop_adc(struct it8172_state *s)
{
	struct dmabuf* db = &s->dma_adc;
	unsigned long flags;
	unsigned char imc;
    
	if (db->stopped)
		return;

	spin_lock_irqsave(&s->lock, flags);

	s->capcc &= ~(CC_CA | CC_CP | CC_CB2L | CC_CB1L);
	s->capcc |= CC_CSP;
	outw(s->capcc, s->io+IT_AC_CAPCC);
    
	// disable capture interrupt
	imc = inb(s->io+IT_AC_IMC);
	outb(imc | IMC_CCIM, s->io+IT_AC_IMC);

	db->stopped = 1;

	spin_unlock_irqrestore(&s->lock, flags);
}	

static inline void stop_dac(struct it8172_state *s)
{
	struct dmabuf* db = &s->dma_dac;
	unsigned long flags;
	unsigned char imc;
    
	if (db->stopped)