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230 lines
5 KiB
C
230 lines
5 KiB
C
/*
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* Initialisation code for Cyrix/NatSemi VSA1 softaudio
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*
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* (C) Copyright 2003 Red Hat Inc <alan@lxorguk.ukuu.org.uk>
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*
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* XpressAudio(tm) is used on the Cyrix MediaGX (now NatSemi Geode) systems.
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* The older version (VSA1) provides fairly good soundblaster emulation
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* although there are a couple of bugs: large DMA buffers break record,
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* and the MPU event handling seems suspect. VSA2 allows the native driver
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* to control the AC97 audio engine directly and requires a different driver.
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*
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* Thanks to National Semiconductor for providing the needed information
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* on the XpressAudio(tm) internals.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* TO DO:
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* Investigate whether we can portably support Cognac (5520) in the
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* same manner.
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*/
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include "sound_config.h"
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#include "sb.h"
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/*
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* Read a soundblaster compatible mixer register.
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* In this case we are actually reading an SMI trap
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* not real hardware.
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*/
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static u8 __devinit mixer_read(unsigned long io, u8 reg)
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{
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outb(reg, io + 4);
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udelay(20);
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reg = inb(io + 5);
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udelay(20);
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return reg;
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}
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static int __devinit probe_one(struct pci_dev *pdev, const struct pci_device_id *ent)
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{
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struct address_info *hw_config;
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unsigned long base;
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void __iomem *mem;
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unsigned long io;
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u16 map;
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u8 irq, dma8, dma16;
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int oldquiet;
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extern int sb_be_quiet;
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base = pci_resource_start(pdev, 0);
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if(base == 0UL)
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return 1;
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mem = ioremap(base, 128);
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if (!mem)
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return 1;
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map = readw(mem + 0x18); /* Read the SMI enables */
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iounmap(mem);
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/* Map bits
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0:1 * 0x20 + 0x200 = sb base
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2 sb enable
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3 adlib enable
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5 MPU enable 0x330
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6 MPU enable 0x300
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The other bits may be used internally so must be masked */
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io = 0x220 + 0x20 * (map & 3);
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if(map & (1<<2))
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printk(KERN_INFO "kahlua: XpressAudio at 0x%lx\n", io);
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else
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return 1;
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if(map & (1<<5))
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printk(KERN_INFO "kahlua: MPU at 0x300\n");
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else if(map & (1<<6))
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printk(KERN_INFO "kahlua: MPU at 0x330\n");
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irq = mixer_read(io, 0x80) & 0x0F;
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dma8 = mixer_read(io, 0x81);
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// printk("IRQ=%x MAP=%x DMA=%x\n", irq, map, dma8);
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if(dma8 & 0x20)
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dma16 = 5;
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else if(dma8 & 0x40)
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dma16 = 6;
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else if(dma8 & 0x80)
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dma16 = 7;
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else
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{
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printk(KERN_ERR "kahlua: No 16bit DMA enabled.\n");
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return 1;
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}
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if(dma8 & 0x01)
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dma8 = 0;
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else if(dma8 & 0x02)
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dma8 = 1;
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else if(dma8 & 0x08)
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dma8 = 3;
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else
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{
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printk(KERN_ERR "kahlua: No 8bit DMA enabled.\n");
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return 1;
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}
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if(irq & 1)
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irq = 9;
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else if(irq & 2)
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irq = 5;
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else if(irq & 4)
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irq = 7;
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else if(irq & 8)
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irq = 10;
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else
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{
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printk(KERN_ERR "kahlua: SB IRQ not set.\n");
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return 1;
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}
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printk(KERN_INFO "kahlua: XpressAudio on IRQ %d, DMA %d, %d\n",
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irq, dma8, dma16);
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hw_config = kzalloc(sizeof(struct address_info), GFP_KERNEL);
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if(hw_config == NULL)
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{
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printk(KERN_ERR "kahlua: out of memory.\n");
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return 1;
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}
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pci_set_drvdata(pdev, hw_config);
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hw_config->io_base = io;
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hw_config->irq = irq;
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hw_config->dma = dma8;
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hw_config->dma2 = dma16;
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hw_config->name = "Cyrix XpressAudio";
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hw_config->driver_use_1 = SB_NO_MIDI | SB_PCI_IRQ;
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if (!request_region(io, 16, "soundblaster"))
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goto err_out_free;
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if(sb_dsp_detect(hw_config, 0, 0, NULL)==0)
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{
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printk(KERN_ERR "kahlua: audio not responding.\n");
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release_region(io, 16);
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goto err_out_free;
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}
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oldquiet = sb_be_quiet;
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sb_be_quiet = 1;
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if(sb_dsp_init(hw_config, THIS_MODULE))
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{
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sb_be_quiet = oldquiet;
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goto err_out_free;
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}
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sb_be_quiet = oldquiet;
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return 0;
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err_out_free:
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pci_set_drvdata(pdev, NULL);
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kfree(hw_config);
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return 1;
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}
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static void __devexit remove_one(struct pci_dev *pdev)
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{
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struct address_info *hw_config = pci_get_drvdata(pdev);
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sb_dsp_unload(hw_config, 0);
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pci_set_drvdata(pdev, NULL);
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kfree(hw_config);
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}
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MODULE_AUTHOR("Alan Cox");
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MODULE_DESCRIPTION("Kahlua VSA1 PCI Audio");
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MODULE_LICENSE("GPL");
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/*
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* 5530 only. The 5510/5520 decode is different.
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*/
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static struct pci_device_id id_tbl[] = {
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{ PCI_VDEVICE(CYRIX, PCI_DEVICE_ID_CYRIX_5530_AUDIO), 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(pci, id_tbl);
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static struct pci_driver kahlua_driver = {
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.name = "kahlua",
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.id_table = id_tbl,
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.probe = probe_one,
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.remove = __devexit_p(remove_one),
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};
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static int __init kahlua_init_module(void)
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{
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printk(KERN_INFO "Cyrix Kahlua VSA1 XpressAudio support (c) Copyright 2003 Red Hat Inc\n");
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return pci_register_driver(&kahlua_driver);
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}
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static void __devexit kahlua_cleanup_module(void)
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{
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pci_unregister_driver(&kahlua_driver);
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}
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module_init(kahlua_init_module);
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module_exit(kahlua_cleanup_module);
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