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 int snd_cs5530_free(struct snd_cs5530 *chip)
  69{
  70        pci_release_regions(chip->pci);
  71        pci_disable_device(chip->pci);
  72        kfree(chip);
  73        return 0;
  74}
  75
  76static int snd_cs5530_dev_free(struct snd_device *device)
  77{
  78        struct snd_cs5530 *chip = device->device_data;
  79        return snd_cs5530_free(chip);
  80}
  81
  82static void snd_cs5530_remove(struct pci_dev *pci)
  83{
  84        snd_card_free(pci_get_drvdata(pci));
  85}
  86
  87static u8 snd_cs5530_mixer_read(unsigned long io, u8 reg)
  88{
  89        outb(reg, io + 4);
  90        udelay(20);
  91        reg = inb(io + 5);
  92        udelay(20);
  93        return reg;
  94}
  95
  96static int snd_cs5530_create(struct snd_card *card,
  97                             struct pci_dev *pci,
  98                             struct snd_cs5530 **rchip)
  99{
 100        struct snd_cs5530 *chip;
 101        unsigned long sb_base;
 102        u8 irq, dma8, dma16 = 0;
 103        u16 map;
 104        void __iomem *mem;
 105        int err;
 106
 107        static const struct snd_device_ops ops = {
 108                .dev_free = snd_cs5530_dev_free,
 109        };
 110        *rchip = NULL;
 111
 112        err = pci_enable_device(pci);
 113        if (err < 0)
 114                return err;
 115
 116        chip = kzalloc(sizeof(*chip), GFP_KERNEL);
 117        if (chip == NULL) {
 118                pci_disable_device(pci);
 119                return -ENOMEM;
 120        }
 121
 122        chip->card = card;
 123        chip->pci = pci;
 124
 125        err = pci_request_regions(pci, "CS5530");
 126        if (err < 0) {
 127                kfree(chip); 
 128                pci_disable_device(pci);
 129                return err;
 130        }
 131        chip->pci_base = pci_resource_start(pci, 0);
 132
 133        mem = pci_ioremap_bar(pci, 0);
 134        if (mem == NULL) {
 135                snd_cs5530_free(chip);
 136                return -EBUSY;
 137        }
 138
 139        map = readw(mem + 0x18);
 140        iounmap(mem);
 141
 142        /* Map bits
 143                0:1     * 0x20 + 0x200 = sb base
 144                2       sb enable
 145                3       adlib enable
 146                5       MPU enable 0x330
 147                6       MPU enable 0x300
 148
 149           The other bits may be used internally so must be masked */
 150
 151        sb_base = 0x220 + 0x20 * (map & 3);
 152
 153        if (map & (1<<2))
 154                dev_info(card->dev, "XpressAudio at 0x%lx\n", sb_base);
 155        else {
 156                dev_err(card->dev, "Could not find XpressAudio!\n");
 157                snd_cs5530_free(chip);
 158                return -ENODEV;
 159        }
 160
 161        if (map & (1<<5))
 162                dev_info(card->dev, "MPU at 0x300\n");
 163        else if (map & (1<<6))
 164                dev_info(card->dev, "MPU at 0x330\n");
 165
 166        irq = snd_cs5530_mixer_read(sb_base, 0x80) & 0x0F;
 167        dma8 = snd_cs5530_mixer_read(sb_base, 0x81);
 168
 169        if (dma8 & 0x20)
 170                dma16 = 5;
 171        else if (dma8 & 0x40)
 172                dma16 = 6;
 173        else if (dma8 & 0x80)
 174                dma16 = 7;
 175        else {
 176                dev_err(card->dev, "No 16bit DMA enabled\n");
 177                snd_cs5530_free(chip);
 178                return -ENODEV;
 179        }
 180
 181        if (dma8 & 0x01)
 182                dma8 = 0;
 183        else if (dma8 & 02)
 184                dma8 = 1;
 185        else if (dma8 & 0x08)
 186                dma8 = 3;
 187        else {
 188                dev_err(card->dev, "No 8bit DMA enabled\n");
 189                snd_cs5530_free(chip);
 190                return -ENODEV;
 191        }
 192
 193        if (irq & 1)
 194                irq = 9;
 195        else if (irq & 2)
 196                irq = 5;
 197        else if (irq & 4)
 198                irq = 7;
 199        else if (irq & 8)
 200                irq = 10;
 201        else {
 202                dev_err(card->dev, "SoundBlaster IRQ not set\n");
 203                snd_cs5530_free(chip);
 204                return -ENODEV;
 205        }
 206
 207        dev_info(card->dev, "IRQ: %d DMA8: %d DMA16: %d\n", irq, dma8, dma16);
 208
 209        err = snd_sbdsp_create(card, sb_base, irq, snd_sb16dsp_interrupt, dma8,
 210                                                dma16, SB_HW_CS5530, &chip->sb);
 211        if (err < 0) {
 212                dev_err(card->dev, "Could not create SoundBlaster\n");
 213                snd_cs5530_free(chip);
 214                return err;
 215        }
 216
 217        err = snd_sb16dsp_pcm(chip->sb, 0);
 218        if (err < 0) {
 219                dev_err(card->dev, "Could not create PCM\n");
 220                snd_cs5530_free(chip);
 221                return err;
 222        }
 223
 224        err = snd_sbmixer_new(chip->sb);
 225        if (err < 0) {
 226                dev_err(card->dev, "Could not create Mixer\n");
 227                snd_cs5530_free(chip);
 228                return err;
 229        }
 230
 231        err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
 232        if (err < 0) {
 233                snd_cs5530_free(chip);
 234                return err;
 235        }
 236
 237        *rchip = chip;
 238        return 0;
 239}
 240
 241static int snd_cs5530_probe(struct pci_dev *pci,
 242                            const struct pci_device_id *pci_id)
 243{
 244        static int dev;
 245        struct snd_card *card;
 246        struct snd_cs5530 *chip = NULL;
 247        int err;
 248
 249        if (dev >= SNDRV_CARDS)
 250                return -ENODEV;
 251        if (!enable[dev]) {
 252                dev++;
 253                return -ENOENT;
 254        }
 255
 256        err = snd_card_new(&pci->dev, index[dev], id[dev], THIS_MODULE,
 257                           0, &card);
 258
 259        if (err < 0)
 260                return err;
 261
 262        err = snd_cs5530_create(card, pci, &chip);
 263        if (err < 0) {
 264                snd_card_free(card);
 265                return err;
 266        }
 267
 268        strcpy(card->driver, "CS5530");
 269        strcpy(card->shortname, "CS5530 Audio");
 270        sprintf(card->longname, "%s at 0x%lx", card->shortname, chip->pci_base);
 271
 272        err = snd_card_register(card);
 273        if (err < 0) {
 274                snd_card_free(card);
 275                return err;
 276        }
 277        pci_set_drvdata(pci, card);
 278        dev++;
 279        return 0;
 280}
 281
 282static struct pci_driver cs5530_driver = {
 283        .name = KBUILD_MODNAME,
 284        .id_table = snd_cs5530_ids,
 285        .probe = snd_cs5530_probe,
 286        .remove = snd_cs5530_remove,
 287};
 288
 289module_pci_driver(cs5530_driver);
 290