path: root/sound/oss/mad16.c

/*
 * Copyright (C) by Hannu Savolainen 1993-1997
 *
 * mad16.c
 *
 * Initialization code for OPTi MAD16 compatible audio chips. Including
 *
 *      OPTi 82C928     MAD16           (replaced by C929)
 *      OAK OTI-601D    Mozart
 *      OAK OTI-605	Mozart		(later version with MPU401 Midi)
 *      OPTi 82C929     MAD16 Pro
 *      OPTi 82C930
 *      OPTi 82C924
 *
 * These audio interface chips don't produce sound themselves. They just
 * connect some other components (OPL-[234] and a WSS compatible codec)
 * to the PC bus and perform I/O, DMA and IRQ address decoding. There is
 * also a UART for the MPU-401 mode (not 82C928/Mozart).
 * The Mozart chip appears to be compatible with the 82C928, although later
 * issues of the card, using the OTI-605 chip, have an MPU-401 compatible Midi
 * port. This port is configured differently to that of the OPTi audio chips.
 *
 *	Changes
 *	
 *	Alan Cox		Clean up, added module selections.
 *
 *	A. Wik			Added support for Opti924 PnP.
 *				Improved debugging support.	16-May-1998
 *				Fixed bug.			16-Jun-1998
 *
 *      Torsten Duwe            Made Opti924 PnP support non-destructive
 *                                                             	23-Dec-1998
 *
 *	Paul Grayson		Added support for Midi on later Mozart cards.
 *								25-Nov-1999
 *	Christoph Hellwig	Adapted to module_init/module_exit.
 *	Arnaldo C. de Melo	got rid of attach_uart401       21-Sep-2000
 *
 *	Pavel Rabel		Clean up                           Nov-2000
 */

#include <linux/config.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/gameport.h>
#include <linux/spinlock.h>
#include "sound_config.h"

#include "ad1848.h"
#include "sb.h"
#include "mpu401.h"

#if defined(CONFIG_GAMEPORT) || (defined(MODULE) && defined(CONFIG_GAMEPORT_MODULE))
#define SUPPORT_JOYSTICK 1
#endif

static int      mad16_conf;
static int      mad16_cdsel;
static DEFINE_SPINLOCK(lock);

#define C928	1
#define MOZART	2
#define C929	3
#define C930	4
#define C924    5

/*
 *    Registers
 *
 *      The MAD16 occupies I/O ports 0xf8d to 0xf93 (fixed locations).
 *      All ports are inactive by default. They can be activated by
 *      writing 0xE2 or 0xE3 to the password register. The password is valid
 *      only until the next I/O read or write.
 *
 *      82C930 uses 0xE4 as the password and indirect addressing to access
 *      the config registers.
 */

#define MC0_PORT	0xf8c	/* Dummy port */
#define MC1_PORT	0xf8d	/* SB address, CD-ROM interface type, joystick */
#define MC2_PORT	0xf8e	/* CD-ROM address, IRQ, DMA, plus OPL4 bit */
#define MC3_PORT	0xf8f
#define PASSWD_REG	0xf8f
#define MC4_PORT	0xf90
#define MC5_PORT	0xf91
#define MC6_PORT	0xf92
#define MC7_PORT	0xf93
#define MC8_PORT	0xf94
#define MC9_PORT	0xf95
#define MC10_PORT	0xf96
#define MC11_PORT	0xf97
#define MC12_PORT	0xf98

static int      board_type = C928;

static int     *mad16_osp;
static int	c931_detected;	/* minor differences from C930 */
static char	c924pnp;	/* "     "           "    C924 */
static int	debug;  	/* debugging output */

#ifdef DDB
#undef DDB
#endif
#define DDB(x) do {if (debug) x;} while (0)

static unsigned char mad_read(int port)
{
	unsigned long flags;
	unsigned char tmp;

	spin_lock_irqsave(&lock,flags);

	switch (board_type)	/* Output password */
	{
		case C928:
		case MOZART:
			outb((0xE2), PASSWD_REG);
			break;

		case C929:
			outb((0xE3), PASSWD_REG);
			break;

		case C930:
			/* outb(( 0xE4),  PASSWD_REG); */
			break;

		case C924:
			/* the c924 has its ports relocated by -128 if
			   PnP is enabled  -aw */
			if (!c924pnp)
				outb((0xE5), PASSWD_REG); else
				outb((0xE5), PASSWD_REG - 0x80);
			break;
	}

	if (board_type == C930)
	{
		outb((port - MC0_PORT), 0xe0e);	/* Write to index reg */
		tmp = inb(0xe0f);	/* Read from data reg */
	}
	else
		if (!c924pnp)
			tmp = inb(port); else
			tmp = inb(port-0x80);
	spin_unlock_irqrestore(&lock,flags);

	return tmp;
}

static void mad_write(int port, int value)
{
	unsigned long   flags;

	spin_lock_irqsave(&lock,flags);

	switch (board_type)	/* Output password */
	{
		case C928:
		case MOZART:
			outb((0xE2), PASSWD_REG);
			break;

		case C929:
			outb((0xE3), PASSWD_REG);
			break;

		case C930:
			/* outb(( 0xE4),  PASSWD_REG); */
			break;

		case C924:
			if (!c924pnp)
				outb((0xE5), PASSWD_REG); else
				outb((0xE5), PASSWD_REG - 0x80);
			break;
	}

	if (board_type == C930)
	{
		outb((port - MC0_PORT), 0xe0e);	/* Write to index reg */
		outb(((unsigned char) (value & 0xff)), 0xe0f);
	}
	else
		if (!c924pnp)
			outb(((unsigned char) (value & 0xff)), port); else
			outb(((unsigned char) (value & 0xff)), port-0x80);
	spin_unlock_irqrestore(&lock,flags);
}

static<