sb_ess.c

iis s3c2410-uda1341语音系统的 开发

/*
 *	Set IRQ configuration register for all ESS models
 */
static int ess_common_set_irq_hw (sb_devc * devc)
{
	int irq_bits;

	if ((irq_bits = ess_irq_bits (devc->irq)) == -1) return 0;

	if (!ess_write (devc, 0xb1, 0x50 | (irq_bits << 2))) {
		printk(KERN_ERR "ES1688: Failed to write to IRQ config register\n");
		return 0;
	}
	return 1;
}

/*
 * I wanna use modern ES1887 mixer irq handling. Funny is the
 * fact that my BIOS wants the same. But suppose someone's BIOS
 * doesn't do this!
 * This is independent of duplex. If there's a 1887 this will
 * prevent it from going into 1888 mode.
 */
static void ess_es1887_set_irq_hw (sb_devc * devc)
{
	int irq_bits;

	if ((irq_bits = ess_irq_bits (devc->irq)) == -1) return;

	ess_chgmixer (devc, 0x7f, 0x0f, 0x01 | ((irq_bits + 1) << 1));
}

static int ess_set_irq_hw (sb_devc * devc)
{
	if (devc->submodel == SUBMDL_ES1887) ess_es1887_set_irq_hw (devc);

	return ess_common_set_irq_hw (devc);
}

#ifdef FKS_TEST

/*
 * FKS_test:
 *	for ES1887: 00, 18, non wr bits: 0001 1000
 *	for ES1868: 00, b8, non wr bits: 1011 1000
 *	for ES1888: 00, f8, non wr bits: 1111 1000
 *	for ES1688: 00, f8, non wr bits: 1111 1000
 *	+   ES968
 */

static void FKS_test (sb_devc * devc)
{
	int val1, val2;
	val1 = ess_getmixer (devc, 0x64);
	ess_setmixer (devc, 0x64, ~val1);
	val2 = ess_getmixer (devc, 0x64) ^ ~val1;
	ess_setmixer (devc, 0x64, val1);
	val1 ^= ess_getmixer (devc, 0x64);
printk (KERN_INFO "FKS: FKS_test %02x, %02x\n", (val1 & 0x0ff), (val2 & 0x0ff));
};
#endif

static unsigned int ess_identify (sb_devc * devc)
{
	unsigned int val;
	unsigned long flags;

	spin_lock_irqsave(&devc->lock, flags);
	outb(((unsigned char) (0x40 & 0xff)), MIXER_ADDR);

	udelay(20);
	val  = inb(MIXER_DATA) << 8;
	udelay(20);
	val |= inb(MIXER_DATA);
	udelay(20);
	spin_unlock_irqrestore(&devc->lock, flags);

	return val;
}

/*
 * ESS technology describes a detection scheme in their docs. It involves
 * fiddling with the bits in certain mixer registers. ess_probe is supposed
 * to help.
 *
 * FKS: tracing shows ess_probe writes wrong value to 0x64. Bit 3 reads 1, but
 * should be written 0 only. Check this.
 */
static int ess_probe (sb_devc * devc, int reg, int xorval)
{
	int  val1, val2, val3;

	val1 = ess_getmixer (devc, reg);
	val2 = val1 ^ xorval;
	ess_setmixer (devc, reg, val2);
	val3 = ess_getmixer (devc, reg);
	ess_setmixer (devc, reg, val1);

	return (val2 == val3);
}

int ess_init(sb_devc * devc, struct address_info *hw_config)
{
	unsigned char cfg;
	int ess_major = 0, ess_minor = 0;
	int i;
	static char name[100], modelname[10];

	/*
	 * Try to detect ESS chips.
	 */

	sb_dsp_command(devc, 0xe7); /* Return identification */

	for (i = 1000; i; i--) {
		if (inb(DSP_DATA_AVAIL) & 0x80) {
			if (ess_major == 0) {
				ess_major = inb(DSP_READ);
			} else {
				ess_minor = inb(DSP_READ);
				break;
			}
		}
	}

	if (ess_major == 0) return 0;

	if (ess_major == 0x48 && (ess_minor & 0xf0) == 0x80) {
		sprintf(name, "ESS ES488 AudioDrive (rev %d)",
			ess_minor & 0x0f);
		hw_config->name = name;
		devc->model = MDL_SBPRO;
		return 1;
	}

	/*
	 * This the detection heuristic of ESS technology, though somewhat
	 * changed to actually make it work.
	 * This results in the following detection steps:
	 * - distinct between ES688 and ES1688+ (as always done in this driver)
	 *   if ES688 we're ready
	 * - try to detect ES1868, ES1869 or ES1878 (ess_identify)
	 *   if successful we're ready
	 * - try to detect ES1888, ES1887 or ES1788 (aim: detect ES1887)
	 *   if successful we're ready
	 * - Dunno. Must be 1688. Will do in general
	 *
	 * This is the most BETA part of the software: Will the detection
	 * always work?
	 */
	devc->model = MDL_ESS;
	devc->submodel = ess_minor & 0x0f;

	if (ess_major == 0x68 && (ess_minor & 0xf0) == 0x80) {
		char *chip = NULL;
		int submodel = -1;

		switch (devc->sbmo.esstype) {
		case ESSTYPE_DETECT:
		case ESSTYPE_LIKE20:
			break;
		case 688:
			submodel = 0x00;
			break;
		case 1688:
			submodel = 0x08;
			break;
		case 1868:
			submodel = SUBMDL_ES1868;
			break;
		case 1869:
			submodel = SUBMDL_ES1869;
			break;
		case 1788:
			submodel = SUBMDL_ES1788;
			break;
		case 1878:
			submodel = SUBMDL_ES1878;
			break;
		case 1879:
			submodel = SUBMDL_ES1879;
			break;
		case 1887:
			submodel = SUBMDL_ES1887;
			break;
		case 1888:
			submodel = SUBMDL_ES1888;
			break;
		default:
			printk (KERN_ERR "Invalid esstype=%d specified\n", devc->sbmo.esstype);
			return 0;
		};
		if (submodel != -1) {
			devc->submodel = submodel;
			sprintf (modelname, "ES%d", devc->sbmo.esstype);
			chip = modelname;
		};
		if (chip == NULL && (ess_minor & 0x0f) < 8) {
			chip = "ES688";
		};
#ifdef FKS_TEST
FKS_test (devc);
#endif
		/*
		 * If Nothing detected yet, and we want 2.0 behaviour...
		 * Then let's assume it's ES1688.
		 */
		if (chip == NULL && devc->sbmo.esstype == ESSTYPE_LIKE20) {
			chip = "ES1688";
		};

		if (chip == NULL) {
			int type;

			type = ess_identify (devc);

			switch (type) {
			case 0x1868:
				chip = "ES1868";
				devc->submodel = SUBMDL_ES1868;
				break;
			case 0x1869:
				chip = "ES1869";
				devc->submodel = SUBMDL_ES1869;
				break;
			case 0x1878:
				chip = "ES1878";
				devc->submodel = SUBMDL_ES1878;
				break;
			case 0x1879:
				chip = "ES1879";
				devc->submodel = SUBMDL_ES1879;
				break;
			default:
				if ((type & 0x00ff) != ((type >> 8) & 0x00ff)) {
					printk ("ess_init: Unrecognized %04x\n", type);
				}
			};
		};
#if 0
		/*
		 * this one failed:
		 * the probing of bit 4 is another thought: from ES1788 and up, all
		 * chips seem to have hardware volume control. Bit 4 is readonly to
		 * check if a hardware volume interrupt has fired.
		 * Cause ES688/ES1688 don't have this feature, bit 4 might be writeable
		 * for these chips.
		 */
		if (chip == NULL && !ess_probe(devc, 0x64, (1 << 4))) {
#endif
		/*
		 * the probing of bit 2 is my idea. The ES1887 docs want me to probe
		 * bit 3. This results in ES1688 being detected as ES1788.
		 * Bit 2 is for "Enable HWV IRQE", but as ES(1)688 chips don't have
		 * HardWare Volume, I think they don't have this IRQE.
		 */
		if (chip == NULL && ess_probe(devc, 0x64, (1 << 2))) {
			if (ess_probe (devc, 0x70, 0x7f)) {
				if (ess_probe (devc, 0x64, (1 << 5))) {
					chip = "ES1887";
					devc->submodel = SUBMDL_ES1887;
				} else {
					chip = "ES1888";
					devc->submodel = SUBMDL_ES1888;
				}
			} else {
				chip = "ES1788";
				devc->submodel = SUBMDL_ES1788;
			}
		};
		if (chip == NULL) {
			chip = "ES1688";
		};

	    printk ( KERN_INFO "ESS chip %s %s%s\n"
               , chip
               , ( devc->sbmo.esstype == ESSTYPE_DETECT || devc->sbmo.esstype == ESSTYPE_LIKE20
                 ? "detected"
                 : "specified"
                 )
               , ( devc->sbmo.esstype == ESSTYPE_LIKE20
                 ? " (kernel 2.0 compatible)"
                 : ""
                 )
               );

		sprintf(name,"ESS %s AudioDrive (rev %d)", chip, ess_minor & 0x0f);
	} else {
		strcpy(name, "Jazz16");
	}

	/* AAS: info stolen from ALSA: these boards have different clocks */
	switch(devc->submodel) {
/* APPARENTLY NOT 1869 AND 1887
		case SUBMDL_ES1869:
		case SUBMDL_ES1887:
*/		
		case SUBMDL_ES1888:
			devc->caps |= SB_CAP_ES18XX_RATE;
			break;
	}

	hw_config->name = name;
	/* FKS: sb_dsp_reset to enable extended mode???? */
	sb_dsp_reset(devc); /* Turn on extended mode */

	/*
	 *  Enable joystick and OPL3
	 */
	cfg = ess_getmixer (devc, 0x40);
	ess_setmixer (devc, 0x40, cfg | 0x03);
	if (devc->submodel >= 8) {		/* ES1688 */
		devc->caps |= SB_NO_MIDI;   /* ES1688 uses MPU401 MIDI mode */
	}
	sb_dsp_reset (devc);

	/*
	 * This is important! If it's not done, the IRQ probe in sb_dsp_init
	 * may fail.
	 */
	return ess_set_irq_hw (devc);
}

static int ess_set_dma_hw(sb_devc * devc)
{
	unsigned char cfg, dma_bits = 0, dma16_bits;
	int dma;

#ifdef FKS_LOGGING
printk(KERN_INFO "ess_set_dma_hw: dma8=%d,dma16=%d,dup=%d\n"
, devc->dma8, devc->dma16, devc->duplex);
#endif

	/*
	 * FKS: It seems as if this duplex flag isn't set yet. Check it.
	 */
	dma = devc->dma8;

	if (dma > 3 || dma < 0 || dma == 2) {
		dma_bits = 0;
		printk(KERN_ERR "ESS1688: Invalid DMA8 %d\n", dma);
		return 0;
	} else {
		/* Extended mode DMA enable */
		cfg = 0x50;

		if (dma == 3) {
			dma_bits = 3;
		} else {
			dma_bits = dma + 1;
		}
	}

	if (!ess_write (devc, 0xb2, cfg | (dma_bits << 2))) {
		printk(KERN_ERR "ESS1688: Failed to write to DMA config register\n");
		return 0;
	}

	if (devc->duplex) {
		dma = devc->dma16;
		dma16_bits = 0;

		if (dma >= 0) {
			switch (dma) {
			case 0:
				dma_bits = 0x04;
				break;
			case 1:
				dma_bits = 0x05;
				break;
			case 3:
				dma_bits = 0x06;
				break;
			case 5:
				dma_bits   = 0x07;
				dma16_bits = 0x20;
				break;
			default:
				printk(KERN_ERR "ESS1887: Invalid DMA16 %d\n", dma);
				return 0;
			};
			ess_chgmixer (devc, 0x78, 0x20, dma16_bits);
			ess_chgmixer (devc, 0x7d, 0x07, dma_bits);
		}
	}
	return 1;
}

/*
 * This one is called from sb_dsp_init.
 *
 * Return values:
 *  0: Failed
 *  1: Succeeded or doesn't apply (not SUBMDL_ES1887)
 */
int ess_dsp_init (sb_devc *devc, struct address_info *hw_config)
{
	/*
	 * Caller also checks this, but anyway
	 */
	if (devc->model != MDL_ESS) {
		printk (KERN_INFO "ess_dsp_init for non ESS chip\n");
		return 1;
	}
	/*
	 * This for ES1887 to run Full Duplex. Actually ES1888
	 * is allowed to do so too. I have no idea yet if this
	 * will work for ES1888 however.
	 *
	 * For SB16 having both dma8 and dma16 means enable
	 * Full Duplex. Let's try this for ES1887 too
	 *
	 */
	if (devc->submodel == SUBMDL_ES1887) {
		if (hw_config->dma2 != -1) {
			devc->dma16 = hw_config->dma2;
		}
		/*
		 * devc->duplex initialization is put here, cause
		 * ess_set_dma_hw needs it.
		 */
		if (devc->dma8 != devc->dma16 && devc->dma16 != -1) {
			devc->duplex = 1;
		}
	}
	if (!ess_set_dma_hw (devc)) {
		free_irq(devc->irq, devc);
		return 0;
	}
	return 1;
}

/****************************************************************************
 *																			*
 *									ESS mixer								*
 *																			*
 ****************************************************************************/

#define ES688_RECORDING_DEVICES	\
			( SOUND_MASK_LINE	| SOUND_MASK_MIC	| SOUND_MASK_CD		)
#define ES688_MIXER_DEVICES		\
			( SOUND_MASK_SYNTH	| SOUND_MASK_PCM	| SOUND_MASK_LINE	\
			| SOUND_MASK_MIC	| SOUND_MASK_CD		| SOUND_MASK_VOLUME	\
			| SOUND_MASK_LINE2	| SOUND_MASK_SPEAKER					)

#define ES1688_RECORDING_DEVICES	\
			( ES688_RECORDING_DEVICES					)
#define ES1688_MIXER_DEVICES		\
			( ES688_MIXER_DEVICES | SOUND_MASK_RECLEV	)

#define ES1887_RECORDING_DEVICES	\
			( ES1688_RECORDING_DEVICES | SOUND_MASK_LINE2 | SOUND_MASK_SYNTH)
#define ES1887_MIXER_DEVICES		\
			( ES1688_MIXER_DEVICES											)

/*
 * Mixer registers of ES1887