ad1848.c

iis s3c2410-uda1341语音系统的 开发

void ad1848_unload(int io_base, int irq, int dma_playback, int dma_capture, int share_dma)
{
	int i, mixer, dev = 0;
	ad1848_info *devc = NULL;

	for (i = 0; devc == NULL && i < nr_ad1848_devs; i++)
	{
		if (adev_info[i].base == io_base)
		{
			devc = &adev_info[i];
			dev = devc->dev_no;
		}
	}
		
	if (devc != NULL)
	{
		if(audio_devs[dev]->portc!=NULL)
			kfree(audio_devs[dev]->portc);
		release_region(devc->base, 4);

		if (!share_dma)
		{
			if (devc->irq > 0) /* There is no point in freeing irq, if it wasn't allocated */
				free_irq(devc->irq, (void *)devc->dev_no);

			sound_free_dma(dma_playback);

			if (dma_playback != dma_capture)
				sound_free_dma(dma_capture);

		}
		mixer = audio_devs[devc->dev_no]->mixer_dev;
		if(mixer>=0)
			sound_unload_mixerdev(mixer);

		if (devc->pmdev)
			pm_unregister(devc->pmdev);

		nr_ad1848_devs--;
		for ( ; i < nr_ad1848_devs ; i++)
			adev_info[i] = adev_info[i+1];
	}
	else
		printk(KERN_ERR "ad1848: Can't find device to be unloaded. Base=%x\n", io_base);
}

void adintr(int irq, void *dev_id, struct pt_regs *dummy)
{
	unsigned char status;
	ad1848_info *devc;
	int dev;
	int alt_stat = 0xff;
	unsigned char c930_stat = 0;
	int cnt = 0;

	dev = (int)dev_id;
	devc = (ad1848_info *) audio_devs[dev]->devc;

interrupt_again:		/* Jump back here if int status doesn't reset */

	status = inb(io_Status(devc));

	if (status == 0x80)
		printk(KERN_DEBUG "adintr: Why?\n");
	if (devc->model == MD_1848)
		outb((0), io_Status(devc));	/* Clear interrupt status */

	if (status & 0x01)
	{
		if (devc->model == MD_C930)
		{		/* 82C930 has interrupt status register in MAD16 register MC11 */
			unsigned long   flags;

			save_flags(flags);
			cli();

			/* 0xe0e is C930 address port
			 * 0xe0f is C930 data port
			 */
			outb(11, 0xe0e);
			c930_stat = inb(0xe0f);
			outb((~c930_stat), 0xe0f);

			restore_flags(flags);

			alt_stat = (c930_stat << 2) & 0x30;
		}
		else if (devc->model != MD_1848)
		{
			alt_stat = ad_read(devc, 24);
			ad_write(devc, 24, ad_read(devc, 24) & ~alt_stat);	/* Selective ack */
		}

		if ((devc->open_mode & OPEN_READ) && (devc->audio_mode & PCM_ENABLE_INPUT) && (alt_stat & 0x20))
		{
			DMAbuf_inputintr(devc->record_dev);
		}
		if ((devc->open_mode & OPEN_WRITE) && (devc->audio_mode & PCM_ENABLE_OUTPUT) &&
		      (alt_stat & 0x10))
		{
			DMAbuf_outputintr(devc->playback_dev, 1);
		}
		if (devc->model != MD_1848 && (alt_stat & 0x40))	/* Timer interrupt */
		{
			devc->timer_ticks++;
#ifndef EXCLUDE_TIMERS
			if (timer_installed == dev && devc->timer_running)
				sound_timer_interrupt();
#endif
		}
	}
/*
 * Sometimes playback or capture interrupts occur while a timer interrupt
 * is being handled. The interrupt will not be retriggered if we don't
 * handle it now. Check if an interrupt is still pending and restart
 * the handler in this case.
 */
	if (inb(io_Status(devc)) & 0x01 && cnt++ < 4)
	{
		  goto interrupt_again;
	}
}

/*
 *	Experimental initialization sequence for the integrated sound system
 *	of the Compaq Deskpro M.
 */

static int init_deskpro_m(struct address_info *hw_config)
{
	unsigned char   tmp;

	if ((tmp = inb(0xc44)) == 0xff)
	{
		DDB(printk("init_deskpro_m: Dead port 0xc44\n"));
		return 0;
	}

	outb(0x10, 0xc44);
	outb(0x40, 0xc45);
	outb(0x00, 0xc46);
	outb(0xe8, 0xc47);
	outb(0x14, 0xc44);
	outb(0x40, 0xc45);
	outb(0x00, 0xc46);
	outb(0xe8, 0xc47);
	outb(0x10, 0xc44);

	return 1;
}

/*
 *	Experimental initialization sequence for the integrated sound system
 *	of Compaq Deskpro XL.
 */

static int init_deskpro(struct address_info *hw_config)
{
	unsigned char   tmp;

	if ((tmp = inb(0xc44)) == 0xff)
	{
		DDB(printk("init_deskpro: Dead port 0xc44\n"));
		return 0;
	}
	outb((tmp | 0x04), 0xc44);	/* Select bank 1 */
	if (inb(0xc44) != 0x04)
	{
		DDB(printk("init_deskpro: Invalid bank1 signature in port 0xc44\n"));
		return 0;
	}
	/*
	 * OK. It looks like a Deskpro so let's proceed.
	 */

	/*
	 * I/O port 0xc44 Audio configuration register.
	 *
	 * bits 0xc0:   Audio revision bits
	 *              0x00 = Compaq Business Audio
	 *              0x40 = MS Sound System Compatible (reset default)
	 *              0x80 = Reserved
	 *              0xc0 = Reserved
	 * bit 0x20:    No Wait State Enable
	 *              0x00 = Disabled (reset default, DMA mode)
	 *              0x20 = Enabled (programmed I/O mode)
	 * bit 0x10:    MS Sound System Decode Enable
	 *              0x00 = Decoding disabled (reset default)
	 *              0x10 = Decoding enabled
	 * bit 0x08:    FM Synthesis Decode Enable
	 *              0x00 = Decoding Disabled (reset default)
	 *              0x08 = Decoding enabled
	 * bit 0x04     Bank select
	 *              0x00 = Bank 0
	 *              0x04 = Bank 1
	 * bits 0x03    MSS Base address
	 *              0x00 = 0x530 (reset default)
	 *              0x01 = 0x604
	 *              0x02 = 0xf40
	 *              0x03 = 0xe80
	 */

#ifdef DEBUGXL
	/* Debug printing */
	printk("Port 0xc44 (before): ");
	outb((tmp & ~0x04), 0xc44);
	printk("%02x ", inb(0xc44));
	outb((tmp | 0x04), 0xc44);
	printk("%02x\n", inb(0xc44));
#endif

	/* Set bank 1 of the register */
	tmp = 0x58;		/* MSS Mode, MSS&FM decode enabled */

	switch (hw_config->io_base)
	{
		case 0x530:
			tmp |= 0x00;
			break;
		case 0x604:
			tmp |= 0x01;
			break;
		case 0xf40:
			tmp |= 0x02;
			break;
		case 0xe80:
			tmp |= 0x03;
			break;
		default:
			DDB(printk("init_deskpro: Invalid MSS port %x\n", hw_config->io_base));
			return 0;
	}
	outb((tmp & ~0x04), 0xc44);	/* Write to bank=0 */

#ifdef DEBUGXL
	/* Debug printing */
	printk("Port 0xc44 (after): ");
	outb((tmp & ~0x04), 0xc44);	/* Select bank=0 */
	printk("%02x ", inb(0xc44));
	outb((tmp | 0x04), 0xc44);	/* Select bank=1 */
	printk("%02x\n", inb(0xc44));
#endif

	/*
	 * I/O port 0xc45 FM Address Decode/MSS ID Register.
	 *
	 * bank=0, bits 0xfe:   FM synthesis Decode Compare bits 7:1 (default=0x88)
	 * bank=0, bit 0x01:    SBIC Power Control Bit
	 *                      0x00 = Powered up
	 *                      0x01 = Powered down
	 * bank=1, bits 0xfc:   MSS ID (default=0x40)
	 */

#ifdef DEBUGXL
	/* Debug printing */
	printk("Port 0xc45 (before): ");
	outb((tmp & ~0x04), 0xc44);	/* Select bank=0 */
	printk("%02x ", inb(0xc45));
	outb((tmp | 0x04), 0xc44);	/* Select bank=1 */
	printk("%02x\n", inb(0xc45));
#endif

	outb((tmp & ~0x04), 0xc44);	/* Select bank=0 */
	outb((0x88), 0xc45);	/* FM base 7:0 = 0x88 */
	outb((tmp | 0x04), 0xc44);	/* Select bank=1 */
	outb((0x10), 0xc45);	/* MSS ID = 0x10 (MSS port returns 0x04) */

#ifdef DEBUGXL
	/* Debug printing */
	printk("Port 0xc45 (after): ");
	outb((tmp & ~0x04), 0xc44);	/* Select bank=0 */
	printk("%02x ", inb(0xc45));
	outb((tmp | 0x04), 0xc44);	/* Select bank=1 */
	printk("%02x\n", inb(0xc45));
#endif


	/*
	 * I/O port 0xc46 FM Address Decode/Address ASIC Revision Register.
	 *
	 * bank=0, bits 0xff:   FM synthesis Decode Compare bits 15:8 (default=0x03)
	 * bank=1, bits 0xff:   Audio addressing ASIC id
	 */

#ifdef DEBUGXL
	/* Debug printing */
	printk("Port 0xc46 (before): ");
	outb((tmp & ~0x04), 0xc44);	/* Select bank=0 */
	printk("%02x ", inb(0xc46));
	outb((tmp | 0x04), 0xc44);	/* Select bank=1 */
	printk("%02x\n", inb(0xc46));
#endif

	outb((tmp & ~0x04), 0xc44);	/* Select bank=0 */
	outb((0x03), 0xc46);	/* FM base 15:8 = 0x03 */
	outb((tmp | 0x04), 0xc44);	/* Select bank=1 */
	outb((0x11), 0xc46);	/* ASIC ID = 0x11 */

#ifdef DEBUGXL
	/* Debug printing */
	printk("Port 0xc46 (after): ");
	outb((tmp & ~0x04), 0xc44);	/* Select bank=0 */
	printk("%02x ", inb(0xc46));
	outb((tmp | 0x04), 0xc44);	/* Select bank=1 */
	printk("%02x\n", inb(0xc46));
#endif

	/*
	 * I/O port 0xc47 FM Address Decode Register.
	 *
	 * bank=0, bits 0xff:   Decode enable selection for various FM address bits
	 * bank=1, bits 0xff:   Reserved
	 */

#ifdef DEBUGXL
	/* Debug printing */
	printk("Port 0xc47 (before): ");
	outb((tmp & ~0x04), 0xc44);	/* Select bank=0 */
	printk("%02x ", inb(0xc47));
	outb((tmp | 0x04), 0xc44);	/* Select bank=1 */
	printk("%02x\n", inb(0xc47));
#endif

	outb((tmp & ~0x04), 0xc44);	/* Select bank=0 */
	outb((0x7c), 0xc47);	/* FM decode enable bits = 0x7c */
	outb((tmp | 0x04), 0xc44);	/* Select bank=1 */
	outb((0x00), 0xc47);	/* Reserved bank1 = 0x00 */

#ifdef DEBUGXL
	/* Debug printing */
	printk("Port 0xc47 (after): ");
	outb((tmp & ~0x04), 0xc44);	/* Select bank=0 */
	printk("%02x ", inb(0xc47));
	outb((tmp | 0x04), 0xc44);	/* Select bank=1 */
	printk("%02x\n", inb(0xc47));
#endif

	/*
	 * I/O port 0xc6f = Audio Disable Function Register
	 */

#ifdef DEBUGXL
	printk("Port 0xc6f (before) = %02x\n", inb(0xc6f));
#endif

	outb((0x80), 0xc6f);

#ifdef DEBUGXL
	printk("Port 0xc6f (after) = %02x\n", inb(0xc6f));
#endif

	return 1;
}

int probe_ms_sound(struct address_info *hw_config)
{
	unsigned char   tmp;

	DDB(printk("Entered probe_ms_sound(%x, %d)\n", hw_config->io_base, hw_config->card_subtype));

	if (check_region(hw_config->io_base, 8))
	{
		printk(KERN_ERR "MSS: I/O port conflict\n");
		return 0;
	}
	if (hw_config->card_subtype == 1)	/* Has no IRQ/DMA registers */
	{
		/* check_opl3(0x388, hw_config); */
		return ad1848_detect(hw_config->io_base + 4, NULL, hw_config->osp);
	}

	if (deskpro_xl && hw_config->card_subtype == 2)	/* Compaq Deskpro XL */
	{
		if (!init_deskpro(hw_config))
			return 0;
	}

	if (deskpro_m)	/* Compaq Deskpro M */
	{
		if (!init_deskpro_m(hw_config))
			return 0;
	}

	/*
	   * Check if the IO port returns valid signature. The original MS Sound
	   * system returns 0x04 while some cards (AudioTrix Pro for example)
	   * return 0x00 or 0x0f.
	 */

	if ((tmp = inb(hw_config->io_base + 3)) == 0xff)	/* Bus float */
	{
		  int             ret;

		  DDB(printk("I/O address is inactive (%x)\n", tmp));
		  if (!(ret = ad1848_detect(hw_config->io_base + 4, NULL, hw_config->osp)))
			  return 0;
		  return 1;
	}
	DDB(printk("MSS signature = %x\n", tmp & 0x3f));
	if ((tmp & 0x3f) != 0x04 &&
	    (tmp & 0x3f) != 0x0f &&
	    (tmp & 0x3f) != 0x00)
	{
		int ret;

		MDB(printk(KERN_ERR "No MSS signature detected on port 0x%x (0x%x)\n", hw_config->io_base, (int) inb(hw_config->io_base + 3)));
		DDB(printk("Trying to detect codec anyway but IRQ/DMA may not work\n"));
		if (!(ret = ad1848_detect(hw_config->io_base + 4, NULL, hw_config->osp)))
			return 0;

		hw_config->card_subtype = 1;
		return 1;
	}
	if ((hw_config->irq != 5)  &&
	    (hw_config->irq != 7)  &&
	    (hw_config->irq != 9)  &&
	    (hw_config->irq != 10) &&
	    (hw_config->irq != 11) &&
	    (hw_config->irq != 12))
	{
		printk(KERN_ERR "MSS: Bad IRQ %d\n", hw_config->irq);
		return 0;
	}
	if (hw_config->dma != 0 && hw_config->dma != 1 && hw_config->dma != 3)
	{
		  printk(KERN_ERR "MSS: Bad DMA %d\n", hw_config->dma);
		  return 0;
	}
	/*
	 * Check that DMA0 is not in use with a 8 bit board.
	 */

	if (hw_config->dma == 0 && inb(hw_config->io_base + 3) & 0x80)
	{
		printk(KERN_ERR "MSS: Can't use DMA0 with a 8 bit card/slot\n");
		return 0;
	}
	if (hw_config->irq > 7 && hw_config->irq != 9 && inb(hw_config->io_base + 3) & 0x80)
	{
		printk(KERN_ERR "MSS: Can't use IRQ%d with a 8 bit card/slot\n", hw_config->irq);
		return 0;
	}
	return ad1848_detect(hw_config->io_base + 4, NULL, hw_config->osp);
}

void attach_ms_sound(struct address_info *hw_config, struct module *owner)
{
	static signed char interrupt_bits[12] =
	{
		-1, -1, -1, -1, -1, 0x00, -1, 0x08, -1, 0x10, 0x18, 0x20
	};
	signed char     bits;
	char            dma2_bit = 0;

	static char     dma_bits[4] =
	{
		1, 2, 0, 3
	};

	int config_port = hw_config->io_base + 0;
	int version_port = hw_config->io_base + 3;
	int dma = hw_config->dma;
	int dma2 = hw_config->dma2;

	if (hw_config->card_subtype == 1)	/* Has no IRQ/DMA registers */
	{
		hw_config->slots[0] = ad1848_init("MS Sound System", hw_config->io_base + 4,
						    hw_config->irq,
						    hw_config->dma,
						    hw_config->dma2, 0, 
						    hw_config->osp,
						    owner);
		request_region(hw_config->io_base, 4, "WSS config");
		return;
	}
	/*
	 * Set the IRQ and DMA addresses.
	 */

	bits = interrupt_bits[hw_config->irq];
	if (bits == -1)
	{
		printk(KERN_ERR "MSS: Bad IRQ %d\n", hw_config->irq);
		return;
	}
	outb((bits | 0x40), config_port);
	if ((inb(version_port) & 0x40) == 0)
		printk(KERN_ERR "[MSS: IRQ Conflict?]\n");

/*
 * Handle the capture DMA channel
 */

	if (dma2 != -1 && dma2 != dma)
	{
		if (!((dma == 0 && dma2 == 1) ||
			(dma == 1 && dma2 == 0) ||
			(dma == 3 && dma2 == 0)))
		{	/* Unsupported combination. Try to swap channels */
			int tmp = dma;

			dma = dma2;
			dma2 = tmp;
		}
		if ((dma == 0 && dma2 == 1) ||
			(dma == 1 && dma2 == 0) ||
			(dma == 3 && dma2 == 0))
		{
			dma2_bit = 0x04;	/* Enable capture DMA */
		}
		else
		{
			printk(KERN_WARNING "MSS: Invalid capture DMA\n");
			dma2 = dma;
		}
	}
	else
	{
		dma2 = dma;
	}

	hw_config->dma = dma;
	hw_config->dma2 = dma2;

	outb((bits | dma_bits[dma] | dma2_bit), config_port);	/* Write IRQ+DMA setup */

	hw_config->slots[0] = ad1848_init("MS Sound System", hw_config->io_base + 4,
					  hw_config->irq,
					  dma, dma2, 0,
					  hw_config->osp,
					  THIS_MODULE);
	request_region(hw_config->io_base, 4, "WSS config");
}

void unload_ms_sound(struct address_info *hw_config)
{
	ad1848_unload(hw_config->io_base + 4,