linux/sound/pci/cs5530.c
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   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * cs5530.c - Initialisation code for Cyrix/NatSemi VSA1 softaudio
   4 *
   5 *      (C) Copyright 2007 Ash Willis <ashwillis@programmer.net>
   6 *      (C) Copyright 2003 Red Hat Inc <alan@lxorguk.ukuu.org.uk>
   7 *
   8 * This driver was ported (shamelessly ripped ;) from oss/kahlua.c but I did
   9 * mess with it a bit. The chip seems to have to have trouble with full duplex
  10 * mode. If we're recording in 8bit 8000kHz, say, and we then attempt to
  11 * simultaneously play back audio at 16bit 44100kHz, the device actually plays
  12 * back in the same format in which it is capturing. By forcing the chip to
  13 * always play/capture in 16/44100, we can let alsa-lib convert the samples and
  14 * that way we can hack up some full duplex audio. 
  15 * 
  16 * XpressAudio(tm) is used on the Cyrix MediaGX (now NatSemi Geode) systems.
  17 * The older version (VSA1) provides fairly good soundblaster emulation
  18 * although there are a couple of bugs: large DMA buffers break record,
  19 * and the MPU event handling seems suspect. VSA2 allows the native driver
  20 * to control the AC97 audio engine directly and requires a different driver.
  21 *
  22 * Thanks to National Semiconductor for providing the needed information
  23 * on the XpressAudio(tm) internals.
  24 *
  25 * TO DO:
  26 *      Investigate whether we can portably support Cognac (5520) in the
  27 *      same manner.
  28 */
  29
  30#include <linux/delay.h>
  31#include <linux/module.h>
  32#include <linux/pci.h>
  33#include <linux/slab.h>
  34#include <sound/core.h>
  35#include <sound/sb.h>
  36#include <sound/initval.h>
  37
  38MODULE_AUTHOR("Ash Willis");
  39MODULE_DESCRIPTION("CS5530 Audio");
  40MODULE_LICENSE("GPL");
  41
  42static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
  43static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
  44static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;
  45
  46module_param_array(index, int, NULL, 0444);
  47MODULE_PARM_DESC(index, "Index value for CS5530 Audio driver.");
  48module_param_array(id, charp, NULL, 0444);
  49MODULE_PARM_DESC(id, "ID string for CS5530 Audio driver.");
  50module_param_array(enable, bool, NULL, 0444);
  51MODULE_PARM_DESC(enable, "Enable CS5530 Audio driver.");
  52
  53struct snd_cs5530 {
  54        struct snd_card *card;
  55        struct pci_dev *pci;
  56        struct snd_sb *sb;
  57        unsigned long pci_base;
  58};
  59
  60static const struct pci_device_id snd_cs5530_ids[] = {
  61        {PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5530_AUDIO, PCI_ANY_ID,
  62                                                        PCI_ANY_ID, 0, 0},
  63        {0,}
  64};
  65
  66MODULE_DEVICE_TABLE(pci, snd_cs5530_ids);
  67
  68static u8 snd_cs5530_mixer_read(unsigned long io, u8 reg)
  69{
  70        outb(reg, io + 4);
  71        udelay(20);
  72        reg = inb(io + 5);
  73        udelay(20);
  74        return reg;
  75}
  76
  77static int snd_cs5530_create(struct snd_card *card,
  78                             struct pci_dev *pci)
  79{
  80        struct snd_cs5530 *chip = card->private_data;
  81        unsigned long sb_base;
  82        u8 irq, dma8, dma16 = 0;
  83        u16 map;
  84        void __iomem *mem;
  85        int err;
  86
  87        err = pcim_enable_device(pci);
  88        if (err < 0)
  89                return err;
  90
  91        chip->card = card;
  92        chip->pci = pci;
  93
  94        err = pcim_iomap_regions(pci, 1 << 0, "CS5530");
  95        if (err < 0)
  96                return err;
  97        chip->pci_base = pci_resource_start(pci, 0);
  98        mem = pcim_iomap_table(pci)[0];
  99        map = readw(mem + 0x18);
 100
 101        /* Map bits
 102                0:1     * 0x20 + 0x200 = sb base
 103                2       sb enable
 104                3       adlib enable
 105                5       MPU enable 0x330
 106                6       MPU enable 0x300
 107
 108           The other bits may be used internally so must be masked */
 109
 110        sb_base = 0x220 + 0x20 * (map & 3);
 111
 112        if (map & (1<<2))
 113                dev_info(card->dev, "XpressAudio at 0x%lx\n", sb_base);
 114        else {
 115                dev_err(card->dev, "Could not find XpressAudio!\n");
 116                return -ENODEV;
 117        }
 118
 119        if (map & (1<<5))
 120                dev_info(card->dev, "MPU at 0x300\n");
 121        else if (map & (1<<6))
 122                dev_info(card->dev, "MPU at 0x330\n");
 123
 124        irq = snd_cs5530_mixer_read(sb_base, 0x80) & 0x0F;
 125        dma8 = snd_cs5530_mixer_read(sb_base, 0x81);
 126
 127        if (dma8 & 0x20)
 128                dma16 = 5;
 129        else if (dma8 & 0x40)
 130                dma16 = 6;
 131        else if (dma8 & 0x80)
 132                dma16 = 7;
 133        else {
 134                dev_err(card->dev, "No 16bit DMA enabled\n");
 135                return -ENODEV;
 136        }
 137
 138        if (dma8 & 0x01)
 139                dma8 = 0;
 140        else if (dma8 & 02)
 141                dma8 = 1;
 142        else if (dma8 & 0x08)
 143                dma8 = 3;
 144        else {
 145                dev_err(card->dev, "No 8bit DMA enabled\n");
 146                return -ENODEV;
 147        }
 148
 149        if (irq & 1)
 150                irq = 9;
 151        else if (irq & 2)
 152                irq = 5;
 153        else if (irq & 4)
 154                irq = 7;
 155        else if (irq & 8)
 156                irq = 10;
 157        else {
 158                dev_err(card->dev, "SoundBlaster IRQ not set\n");
 159                return -ENODEV;
 160        }
 161
 162        dev_info(card->dev, "IRQ: %d DMA8: %d DMA16: %d\n", irq, dma8, dma16);
 163
 164        err = snd_sbdsp_create(card, sb_base, irq, snd_sb16dsp_interrupt, dma8,
 165                                                dma16, SB_HW_CS5530, &chip->sb);
 166        if (err < 0) {
 167                dev_err(card->dev, "Could not create SoundBlaster\n");
 168                return err;
 169        }
 170
 171        err = snd_sb16dsp_pcm(chip->sb, 0);
 172        if (err < 0) {
 173                dev_err(card->dev, "Could not create PCM\n");
 174                return err;
 175        }
 176
 177        err = snd_sbmixer_new(chip->sb);
 178        if (err < 0) {
 179                dev_err(card->dev, "Could not create Mixer\n");
 180                return err;
 181        }
 182
 183        return 0;
 184}
 185
 186static int snd_cs5530_probe(struct pci_dev *pci,
 187                            const struct pci_device_id *pci_id)
 188{
 189        static int dev;
 190        struct snd_card *card;
 191        struct snd_cs5530 *chip;
 192        int err;
 193
 194        if (dev >= SNDRV_CARDS)
 195                return -ENODEV;
 196        if (!enable[dev]) {
 197                dev++;
 198                return -ENOENT;
 199        }
 200
 201        err = snd_devm_card_new(&pci->dev, index[dev], id[dev], THIS_MODULE,
 202                                sizeof(*chip), &card);
 203        if (err < 0)
 204                return err;
 205        chip = card->private_data;
 206
 207        err = snd_cs5530_create(card, pci);
 208        if (err < 0)
 209                return err;
 210
 211        strcpy(card->driver, "CS5530");
 212        strcpy(card->shortname, "CS5530 Audio");
 213        sprintf(card->longname, "%s at 0x%lx", card->shortname, chip->pci_base);
 214
 215        err = snd_card_register(card);
 216        if (err < 0)
 217                return err;
 218        pci_set_drvdata(pci, card);
 219        dev++;
 220        return 0;
 221}
 222
 223static struct pci_driver cs5530_driver = {
 224        .name = KBUILD_MODNAME,
 225        .id_table = snd_cs5530_ids,
 226        .probe = snd_cs5530_probe,
 227};
 228
 229module_pci_driver(cs5530_driver);
 230
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