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cs5530.c

/*
 * cs5530.c - Initialisation code for Cyrix/NatSemi VSA1 softaudio
 *
 *    (C) Copyright 2007 Ash Willis <ashwillis@programmer.net>
 *    (C) Copyright 2003 Red Hat Inc <alan@lxorguk.ukuu.org.uk>
 *
 * This driver was ported (shamelessly ripped ;) from oss/kahlua.c but I did
 * mess with it a bit. The chip seems to have to have trouble with full duplex
 * mode. If we're recording in 8bit 8000kHz, say, and we then attempt to
 * simultaneously play back audio at 16bit 44100kHz, the device actually plays
 * back in the same format in which it is capturing. By forcing the chip to
 * always play/capture in 16/44100, we can let alsa-lib convert the samples and
 * that way we can hack up some full duplex audio. 
 * 
 * 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/moduleparam.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/sb.h>
#include <sound/initval.h>

MODULE_AUTHOR("Ash Willis");
MODULE_DESCRIPTION("CS5530 Audio");
MODULE_LICENSE("GPL");

static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;

00055 struct snd_cs5530 {
      struct snd_card *card;
      struct pci_dev *pci;
      struct snd_sb *sb;
      unsigned long pci_base;
};

static DEFINE_PCI_DEVICE_TABLE(snd_cs5530_ids) = {
      {PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5530_AUDIO, PCI_ANY_ID,
                                          PCI_ANY_ID, 0, 0},
      {0,}
};

MODULE_DEVICE_TABLE(pci, snd_cs5530_ids);

static int snd_cs5530_free(struct snd_cs5530 *chip)
{
      pci_release_regions(chip->pci);
      pci_disable_device(chip->pci);
      kfree(chip);
      return 0;
}

static int snd_cs5530_dev_free(struct snd_device *device)
{
      struct snd_cs5530 *chip = device->device_data;
      return snd_cs5530_free(chip);
}

static void __devexit snd_cs5530_remove(struct pci_dev *pci)
{
      snd_card_free(pci_get_drvdata(pci));
      pci_set_drvdata(pci, NULL);
}

static u8 __devinit snd_cs5530_mixer_read(unsigned long io, u8 reg)
{
      outb(reg, io + 4);
      udelay(20);
      reg = inb(io + 5);
      udelay(20);
      return reg;
}

static int __devinit snd_cs5530_create(struct snd_card *card,
                               struct pci_dev *pci,
                               struct snd_cs5530 **rchip)
{
      struct snd_cs5530 *chip;
      unsigned long sb_base;
      u8 irq, dma8, dma16 = 0;
      u16 map;
      void __iomem *mem;
      int err;

      static struct snd_device_ops ops = {
            .dev_free = snd_cs5530_dev_free,
      };
      *rchip = NULL;

      err = pci_enable_device(pci);
      if (err < 0)
            return err;

      chip = kzalloc(sizeof(*chip), GFP_KERNEL);
      if (chip == NULL) {
            pci_disable_device(pci);
            return -ENOMEM;
      }

      chip->card = card;
      chip->pci = pci;

      err = pci_request_regions(pci, "CS5530");
      if (err < 0) {
            kfree(chip); 
            pci_disable_device(pci);
            return err;
      }
      chip->pci_base = pci_resource_start(pci, 0);

      mem = pci_ioremap_bar(pci, 0);
      if (mem == NULL) {
            kfree(chip);
            pci_disable_device(pci);
            return -EBUSY;
      }

      map = readw(mem + 0x18);
      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 */

      sb_base = 0x220 + 0x20 * (map & 3);

      if (map & (1<<2))
            printk(KERN_INFO "CS5530: XpressAudio at 0x%lx\n", sb_base);
      else {
            printk(KERN_ERR "Could not find XpressAudio!\n");
            snd_cs5530_free(chip);
            return -ENODEV;
      }

      if (map & (1<<5))
            printk(KERN_INFO "CS5530: MPU at 0x300\n");
      else if (map & (1<<6))
            printk(KERN_INFO "CS5530: MPU at 0x330\n");

      irq = snd_cs5530_mixer_read(sb_base, 0x80) & 0x0F;
      dma8 = snd_cs5530_mixer_read(sb_base, 0x81);

      if (dma8 & 0x20)
            dma16 = 5;
      else if (dma8 & 0x40)
            dma16 = 6;
      else if (dma8 & 0x80)
            dma16 = 7;
      else {
            printk(KERN_ERR "CS5530: No 16bit DMA enabled\n");
            snd_cs5530_free(chip);
            return -ENODEV;
      }

      if (dma8 & 0x01)
            dma8 = 0;
      else if (dma8 & 02)
            dma8 = 1;
      else if (dma8 & 0x08)
            dma8 = 3;
      else {
            printk(KERN_ERR "CS5530: No 8bit DMA enabled\n");
            snd_cs5530_free(chip);
            return -ENODEV;
      }

      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 "CS5530: SoundBlaster IRQ not set\n");
            snd_cs5530_free(chip);
            return -ENODEV;
      }

      printk(KERN_INFO "CS5530: IRQ: %d DMA8: %d DMA16: %d\n", irq, dma8, 
                                                      dma16);

      err = snd_sbdsp_create(card, sb_base, irq, snd_sb16dsp_interrupt, dma8,
                                    dma16, SB_HW_CS5530, &chip->sb);
      if (err < 0) {
            printk(KERN_ERR "CS5530: Could not create SoundBlaster\n");
            snd_cs5530_free(chip);
            return err;
      }

      err = snd_sb16dsp_pcm(chip->sb, 0, &chip->sb->pcm);
      if (err < 0) {
            printk(KERN_ERR "CS5530: Could not create PCM\n");
            snd_cs5530_free(chip);
            return err;
      }

      err = snd_sbmixer_new(chip->sb);
      if (err < 0) {
            printk(KERN_ERR "CS5530: Could not create Mixer\n");
            snd_cs5530_free(chip);
            return err;
      }

      err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
      if (err < 0) {
            snd_cs5530_free(chip);
            return err;
      }

      snd_card_set_dev(card, &pci->dev);
      *rchip = chip;
      return 0;
}

static int __devinit snd_cs5530_probe(struct pci_dev *pci,
                              const struct pci_device_id *pci_id)
{
      static int dev;
      struct snd_card *card;
      struct snd_cs5530 *chip = NULL;
      int err;

      if (dev >= SNDRV_CARDS)
            return -ENODEV;
      if (!enable[dev]) {
            dev++;
            return -ENOENT;
      }

      err = snd_card_create(index[dev], id[dev], THIS_MODULE, 0, &card);

      if (err < 0)
            return err;

      err = snd_cs5530_create(card, pci, &chip);
      if (err < 0) {
            snd_card_free(card);
            return err;
      }

      strcpy(card->driver, "CS5530");
      strcpy(card->shortname, "CS5530 Audio");
      sprintf(card->longname, "%s at 0x%lx", card->shortname, chip->pci_base);

      err = snd_card_register(card);
      if (err < 0) {
            snd_card_free(card);
            return err;
      }
      pci_set_drvdata(pci, card);
      dev++;
      return 0;
}

static struct pci_driver driver = {
      .name = "CS5530_Audio",
      .id_table = snd_cs5530_ids,
      .probe = snd_cs5530_probe,
      .remove = __devexit_p(snd_cs5530_remove),
};

static int __init alsa_card_cs5530_init(void)
{
      return pci_register_driver(&driver);
}

static void __exit alsa_card_cs5530_exit(void)
{
      pci_unregister_driver(&driver);
}

module_init(alsa_card_cs5530_init)
module_exit(alsa_card_cs5530_exit)


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