[ALSA] Add support for Cyrix/NatSemi Geode CS5530 (VSA1)

Add support for Cyrix/NatSemi Geode SC5530 (VSA1).
The driver is snd-cs5530.
Signed-off-by Ash Willis <ashwillis@programmer.net>

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

3 files changed, 318 insertions, 0 deletions

diff --git a/sound/pci/Kconfig b/sound/pci/Kconfig
index 61e35ecc57b8..fa17786e1587 100644
--- a/sound/pci/Kconfig
+++ b/sound/pci/Kconfig
@@ -215,6 +215,16 @@ config SND_CS46XX_NEW_DSP
 
           This works better than the old code, so say Y.
 
+config SND_CS5530
+        tristate "CS5530 Audio"
+        depends on SND && ISA_DMA_API
+        select SND_SB16
+        help
+          Say Y here to include support for audio on Cyrix/NatSemi CS5530 chips.
+
+          To compile this driver as a module, choose M here: the module
+          will be called snd-cs5530.
+
 config SND_CS5535AUDIO
         tristate "CS5535/CS5536 Audio"
         depends on SND && X86 && !X86_64
diff --git a/sound/pci/Makefile b/sound/pci/Makefile
index e06736da9ef1..cd76e0293d06 100644
--- a/sound/pci/Makefile
+++ b/sound/pci/Makefile
@@ -12,6 +12,7 @@ snd-azt3328-objs := azt3328.o
 snd-bt87x-objs := bt87x.o
 snd-cmipci-objs := cmipci.o
 snd-cs4281-objs := cs4281.o
+snd-cs5530-objs := cs5530.o
 snd-ens1370-objs := ens1370.o
 snd-ens1371-objs := ens1371.o
 snd-es1938-objs := es1938.o
@@ -36,6 +37,7 @@ obj-$(CONFIG_SND_AZT3328) += snd-azt3328.o
 obj-$(CONFIG_SND_BT87X) += snd-bt87x.o
 obj-$(CONFIG_SND_CMIPCI) += snd-cmipci.o
 obj-$(CONFIG_SND_CS4281) += snd-cs4281.o
+obj-$(CONFIG_SND_CS5530) += snd-cs5530.o
 obj-$(CONFIG_SND_ENS1370) += snd-ens1370.o
 obj-$(CONFIG_SND_ENS1371) += snd-ens1371.o
 obj-$(CONFIG_SND_ES1938) += snd-es1938.o
diff --git a/sound/pci/cs5530.c b/sound/pci/cs5530.c
new file mode 100644
index 000000000000..240a0a462209
--- /dev/null
+++ b/sound/pci/cs5530.c
@@ -0,0 +1,306 @@
+/*
+ * cs5530.c - Initialisation code for Cyrix/NatSemi VSA1 softaudio
+ *
+ *      (C) Copyright 2007 Ash Willis <ashwillis@programmer.net>
+ *      (C) Copyright 2003 Red Hat Inc <alan@redhat.com>
+ *
+ * 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 <sound/driver.h>
+#include <linux/delay.h>
+#include <linux/moduleparam.h>
+#include <linux/pci.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;
+
+struct snd_cs5530 {
+        struct snd_card *card;
+        struct pci_dev *pci;
+        struct snd_sb *sb;
+        unsigned long pci_base;
+};
+
+static struct pci_device_id 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 = ioremap_nocache(chip->pci_base, pci_resource_len(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;
+        }
+
+        card = snd_card_new(index[dev], id[dev], THIS_MODULE, 0);
+
+        if (card == NULL)
+                return -ENOMEM;
+
+        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)
+