/*
   *	Initialisation code for Cyrix/NatSemi VSA1 softaudio
   *

   *	(C) Copyright 2003 Red Hat Inc <alan@lxorguk.ukuu.org.uk>

   *
   * XpressAudio(tm) is used on the Cyrix MediaGX (now NatSemi Geode) systems.
   * The older version (VSA1) provides fairly good soundblaster emulation
   * although there are a couple of bugs: large DMA buffers break record,
   * and the MPU event handling seems suspect. VSA2 allows the native driver
   * to control the AC97 audio engine directly and requires a different driver.
   *
   * Thanks to National Semiconductor for providing the needed information
   * on the XpressAudio(tm) internals.
   *
   * 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, or (at your option) any
   * later version.
   *
   * This program is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * General Public License for more details.
   *
   * TO DO:
   *	Investigate whether we can portably support Cognac (5520) in the
   *	same manner.
   */

  #include <linux/delay.h>
  #include <linux/init.h>
  #include <linux/module.h>
  #include <linux/pci.h>

  #include <linux/slab.h>

  
  #include "sound_config.h"
  
  #include "sb.h"
  
  /*
   *	Read a soundblaster compatible mixer register.
   *	In this case we are actually reading an SMI trap
   *	not real hardware.
   */

  static u8 mixer_read(unsigned long io, u8 reg)

  {
  	outb(reg, io + 4);
  	udelay(20);
  	reg = inb(io + 5);
  	udelay(20);
  	return reg;
  }

  static int probe_one(struct pci_dev *pdev, const struct pci_device_id *ent)

  {
  	struct address_info *hw_config;
  	unsigned long base;
  	void __iomem *mem;
  	unsigned long io;
  	u16 map;
  	u8 irq, dma8, dma16;
  	int oldquiet;
  	extern int sb_be_quiet;
  		
  	base = pci_resource_start(pdev, 0);
  	if(base == 0UL)
  		return 1;
  	
  	mem = ioremap(base, 128);

  	if (!mem)

  		return 1;
  	map = readw(mem + 0x18);	/* Read the SMI enables */
  	iounmap(mem);
  	
  	/* Map bits
  		0:1	* 0x20 + 0x200 = sb base
  		2	sb enable
  		3	adlib enable
  		5	MPU enable 0x330
  		6	MPU enable 0x300
  		
  	   The other bits may be used internally so must be masked */
  
  	io = 0x220 + 0x20 * (map & 3);	   
  	
  	if(map & (1<<2))
  		printk(KERN_INFO "kahlua: XpressAudio at 0x%lx
  ", io);
  	else
  		return 1;
  		
  	if(map & (1<<5))
  		printk(KERN_INFO "kahlua: MPU at 0x300
  ");
  	else if(map & (1<<6))
  		printk(KERN_INFO "kahlua: MPU at 0x330
  ");
  	
  	irq = mixer_read(io, 0x80) & 0x0F;
  	dma8 = mixer_read(io, 0x81);
  
  	// printk("IRQ=%x MAP=%x DMA=%x
  ", irq, map, dma8);
  	
  	if(dma8 & 0x20)
  		dma16 = 5;
  	else if(dma8 & 0x40)
  		dma16 = 6;
  	else if(dma8 & 0x80)
  		dma16 = 7;
  	else
  	{
  		printk(KERN_ERR "kahlua: No 16bit DMA enabled.
  ");
  		return 1;
  	}
  		
  	if(dma8 & 0x01)
  		dma8 = 0;
  	else if(dma8 & 0x02)
  		dma8 = 1;
  	else if(dma8 & 0x08)
  		dma8 = 3;
  	else
  	{
  		printk(KERN_ERR "kahlua: No 8bit DMA enabled.
  ");
  		return 1;
  	}
  	
  	if(irq & 1)
  		irq = 9;
  	else if(irq & 2)
  		irq = 5;
  	else if(irq & 4)
  		irq = 7;
  	else if(irq & 8)
  		irq = 10;
  	else
  	{
  		printk(KERN_ERR "kahlua: SB IRQ not set.
  ");
  		return 1;
  	}
  	
  	printk(KERN_INFO "kahlua: XpressAudio on IRQ %d, DMA %d, %d
  ",
  		irq, dma8, dma16);
  	

  	hw_config = kzalloc(sizeof(struct address_info), GFP_KERNEL);

  	if(hw_config == NULL)
  	{
  		printk(KERN_ERR "kahlua: out of memory.
  ");
  		return 1;
  	}

  	
  	pci_set_drvdata(pdev, hw_config);
  	
  	hw_config->io_base = io;
  	hw_config->irq = irq;
  	hw_config->dma = dma8;
  	hw_config->dma2 = dma16;
  	hw_config->name = "Cyrix XpressAudio";
  	hw_config->driver_use_1 = SB_NO_MIDI | SB_PCI_IRQ;
  
  	if (!request_region(io, 16, "soundblaster"))
  		goto err_out_free;
  	
  	if(sb_dsp_detect(hw_config, 0, 0, NULL)==0)
  	{
  		printk(KERN_ERR "kahlua: audio not responding.
  ");
  		release_region(io, 16);
  		goto err_out_free;
  	}
  
  	oldquiet = sb_be_quiet;	
  	sb_be_quiet = 1;
  	if(sb_dsp_init(hw_config, THIS_MODULE))
  	{
  		sb_be_quiet = oldquiet;
  		goto err_out_free;
  	}
  	sb_be_quiet = oldquiet;
  	
  	return 0;
  
  err_out_free:

  	kfree(hw_config);
  	return 1;
  }

  static void remove_one(struct pci_dev *pdev)

  {
  	struct address_info *hw_config = pci_get_drvdata(pdev);
  	sb_dsp_unload(hw_config, 0);

  	kfree(hw_config);
  }
  
  MODULE_AUTHOR("Alan Cox");
  MODULE_DESCRIPTION("Kahlua VSA1 PCI Audio");
  MODULE_LICENSE("GPL");
  
  /*
   *	5530 only. The 5510/5520 decode is different.
   */

  static const struct pci_device_id id_tbl[] = {

  	{ PCI_VDEVICE(CYRIX, PCI_DEVICE_ID_CYRIX_5530_AUDIO), 0 },

  	{ }
  };
  
  MODULE_DEVICE_TABLE(pci, id_tbl);
  
  static struct pci_driver kahlua_driver = {
  	.name		= "kahlua",
  	.id_table	= id_tbl,
  	.probe		= probe_one,

  	.remove		= remove_one,

  };
  
  
  static int __init kahlua_init_module(void)
  {
  	printk(KERN_INFO "Cyrix Kahlua VSA1 XpressAudio support (c) Copyright 2003 Red Hat Inc
  ");

  	return pci_register_driver(&kahlua_driver);

  }

  static void kahlua_cleanup_module(void)

  {
  	pci_unregister_driver(&kahlua_driver);
  }
  
  
  module_init(kahlua_init_module);
  module_exit(kahlua_cleanup_module);