--- /dev/null
+/*
+ * 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\n", io);
+ else
+ return 1;
+
+ if(map & (1<<5))
+ printk(KERN_INFO "kahlua: MPU at 0x300\n");
+ else if(map & (1<<6))
+ printk(KERN_INFO "kahlua: MPU at 0x330\n");
+
+ irq = mixer_read(io, 0x80) & 0x0F;
+ dma8 = mixer_read(io, 0x81);
+
+ // printk("IRQ=%x MAP=%x DMA=%x\n", 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.\n");
+ 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.\n");
+ 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.\n");
+ return 1;
+ }
+
+ printk(KERN_INFO "kahlua: XpressAudio on IRQ %d, DMA %d, %d\n",
+ irq, dma8, dma16);
+
+ hw_config = kzalloc(sizeof(struct address_info), GFP_KERNEL);
+ if(hw_config == NULL)
+ {
+ printk(KERN_ERR "kahlua: out of memory.\n");
+ 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.\n");
+ 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\n");
+ 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);
+
Code Review / kvmfornfv.git / blobdiff