/*
 * sound/cs4232.c
 * 
 * The low level driver for Crystal CS4232 based cards. The CS4232 is a PnP
 * compatible chip which contains a CS4231A codec, SB emulation, a MPU401
 * compatible MIDI port, joystick and synthesizer and IDE CD-ROM interfaces.
 * This is just a temporary driver until full PnP support gets inplemented.
 * Just the WSS codec, FM synth and the MIDI ports are supported. Other
 * interfaces are left uninitialized.
 * 
 * Copyright by Hannu Savolainen 1995
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met: 1. Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer. 2.
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
 * 
 */

#include <i386/isa/sound/sound_config.h>

#if defined(CONFIG_CS4232)

#define KEY_PORT	0x279	/* Same as LPT1 status port */
#define CSN_NUM		0x99	/* Just a random number */

#define CS_OUT(a) 		outb( KEY_PORT,  a)
#define CS_OUT2(a, b)		{CS_OUT(a);CS_OUT(b);}
#define CS_OUT3(a, b, c)	{CS_OUT(a);CS_OUT(b);CS_OUT(c);}

static int      mpu_base = 0, mpu_irq = 0;
static int      mpu_detected = 0;

int
probe_cs4232_mpu(struct address_info * hw_config)
{
    /*
     * Just write down the config values.
     */

    mpu_base = hw_config->io_base;
    mpu_irq = hw_config->irq;
    return 0;
}

void
attach_cs4232_mpu(struct address_info * hw_config)
{
}

static unsigned char crystal_key[] =	/* A 32 byte magic key sequence */
{
    0x96, 0x35, 0x9a, 0xcd, 0xe6, 0xf3, 0x79, 0xbc,
    0x5e, 0xaf, 0x57, 0x2b, 0x15, 0x8a, 0xc5, 0xe2,
    0xf1, 0xf8, 0x7c, 0x3e, 0x9f, 0x4f, 0x27, 0x13,
    0x09, 0x84, 0x42, 0xa1, 0xd0, 0x68, 0x34, 0x1a
};

int
probe_cs4232(struct address_info * hw_config)
{
    int             i;
    int             base = hw_config->io_base, irq = hw_config->irq;
    int             dma1 = hw_config->dma, dma2 = hw_config->dma2;

    /*
     * Verify that the I/O port range is free.
     */

    if (0) {
	printf("cs4232.c: I/O port 0x%03x not free\n", base);
	return 0;
    }
    /*
     * This version of the driver doesn't use the PnP method when
     * configuring the card but a simplified method defined by Crystal.
     * This means that just one CS4232 compatible device can exist on the
     * system. Also this method conflicts with possible PnP support in
     * the OS. For this reason driver is just a temporary kludge.
     */

    /*
     * Wake up the card by sending a 32 byte Crystal key to the key port.
     */
    for (i = 0; i < 32; i++)
	CS_OUT(crystal_key[i]);

    /*
     * Now set the CSN (Card Select Number).
     */

    CS_OUT2(0x06, CSN_NUM);

    /*
     * Ensure that there is no other codec using the same address.
     */

    CS_OUT2(0x15, 0x00);	/* Select logical device 0 (WSS/SB/FM) */
    CS_OUT2(0x33, 0x00);	/* Inactivate logical dev 0 */

    /*
     * Then set some config bytes. First logical device 0
     */

    CS_OUT2(0x15, 0x00);	/* Select logical device 0 (WSS/SB/FM) */
    CS_OUT3(0x47, (base >> 8) & 0xff, base & 0xff);	/* WSSbase */

    if (0)			/* Not free */
	CS_OUT3(0x48, 0x00, 0x00)	/* FMbase off */
    else
	CS_OUT3(0x48, 0x03, 0x88);	/* FMbase 0x388 */

    CS_OUT3(0x42, 0x00, 0x00);	/* SBbase off */
    CS_OUT2(0x22, irq);	/* SB+WSS IRQ */
    CS_OUT2(0x2a, dma1);	/* SB+WSS DMA */

    if (dma2 != -1)
	CS_OUT2(0x25, dma2)	/* WSS DMA2 */
    else
	CS_OUT2(0x25, 4);	/* No WSS DMA2 */

    CS_OUT2(0x33, 0x01);	/* Activate logical dev 0 */

    /*
     * Initialize logical device 3 (MPU)
     */

#if (defined(CONFIG_MPU401) || defined(CONFIG_MPU_EMU)) && defined(CONFIG_MIDI)
    if (mpu_base != 0 && mpu_irq != 0) {
	CS_OUT2(0x15, 0x03);	/* Select logical device 3 (MPU) */
	CS_OUT3(0x47, (mpu_base >> 8) & 0xff, mpu_base & 0xff);	/* MPUbase */
	CS_OUT2(0x22, mpu_irq);	/* MPU IRQ */
	CS_OUT2(0x33, 0x01);	/* Activate logical dev 3 */
    }
#endif

    /*
     * Finally activate the chip
     */
    CS_OUT(0x79);

    /*
     * Then try to detect the codec part of the chip
     */

    return ad1848_detect(hw_config->io_base, NULL, hw_config->osp);
}

void
attach_cs4232(struct address_info * hw_config)
{
    int             base = hw_config->io_base, irq = hw_config->irq;
    int             dma1 = hw_config->dma, dma2 = hw_config->dma2;

    if (dma2 == -1)
	dma2 = dma1;

    ad1848_init("CS4232", base,
	irq,
	dma1,	/* Playback DMA */
	dma2,	/* Capture DMA */
	0,
	hw_config->osp);

#if (defined(CONFIG_MPU401) || defined(CONFIG_MPU_EMU)) && defined(CONFIG_MIDI)
    if (mpu_base != 0 && mpu_irq != 0) {
	static struct address_info hw_config2 =
	{0};		/* Ensure it's initialized */

	hw_config2.io_base = mpu_base;
	hw_config2.irq = mpu_irq;
	hw_config2.dma = -1;
	hw_config2.dma2 = -1;
	hw_config2.always_detect = 0;
	hw_config2.name = NULL;
	hw_config2.card_subtype = 0;
	hw_config2.osp = hw_config->osp;

	if (probe_mpu401(&hw_config2)) {
	    mpu_detected = 1;
	    attach_mpu401(&hw_config2);
	} else {
	    mpu_base = mpu_irq = 0;
	}
    }
#endif
}

#endif