cs5530.c

  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	mem = pcim_iomap_region(pci, 0, "CS5530");
 95	if (IS_ERR(mem))
 96		return PTR_ERR(mem);
 97	chip->pci_base = pci_resource_start(pci, 0);
 98	map = readw(mem + 0x18);
 99
100	/* Map bits
101		0:1	* 0x20 + 0x200 = sb base
102		2	sb enable
103		3	adlib enable
104		5	MPU enable 0x330
105		6	MPU enable 0x300
106
107	   The other bits may be used internally so must be masked */
108
109	sb_base = 0x220 + 0x20 * (map & 3);
110
111	if (map & (1<<2))
112		dev_info(card->dev, "XpressAudio at 0x%lx\n", sb_base);
113	else {
114		dev_err(card->dev, "Could not find XpressAudio!\n");
115		return -ENODEV;
116	}
117
118	if (map & (1<<5))
119		dev_info(card->dev, "MPU at 0x300\n");
120	else if (map & (1<<6))
121		dev_info(card->dev, "MPU at 0x330\n");
122
123	irq = snd_cs5530_mixer_read(sb_base, 0x80) & 0x0F;
124	dma8 = snd_cs5530_mixer_read(sb_base, 0x81);
125
126	if (dma8 & 0x20)
127		dma16 = 5;
128	else if (dma8 & 0x40)
129		dma16 = 6;
130	else if (dma8 & 0x80)
131		dma16 = 7;
132	else {
133		dev_err(card->dev, "No 16bit DMA enabled\n");
134		return -ENODEV;
135	}
136
137	if (dma8 & 0x01)
138		dma8 = 0;
139	else if (dma8 & 02)
140		dma8 = 1;
141	else if (dma8 & 0x08)
142		dma8 = 3;
143	else {
144		dev_err(card->dev, "No 8bit DMA enabled\n");
145		return -ENODEV;
146	}
147
148	if (irq & 1)
149		irq = 9;
150	else if (irq & 2)
151		irq = 5;
152	else if (irq & 4)
153		irq = 7;
154	else if (irq & 8)
155		irq = 10;
156	else {
157		dev_err(card->dev, "SoundBlaster IRQ not set\n");
158		return -ENODEV;
159	}
160
161	dev_info(card->dev, "IRQ: %d DMA8: %d DMA16: %d\n", irq, dma8, dma16);
162
163	err = snd_sbdsp_create(card, sb_base, irq, snd_sb16dsp_interrupt, dma8,
164						dma16, SB_HW_CS5530, &chip->sb);
165	if (err < 0) {
166		dev_err(card->dev, "Could not create SoundBlaster\n");
167		return err;
168	}
169
170	err = snd_sb16dsp_pcm(chip->sb, 0);
171	if (err < 0) {
172		dev_err(card->dev, "Could not create PCM\n");
173		return err;
174	}
175
176	err = snd_sbmixer_new(chip->sb);
177	if (err < 0) {
178		dev_err(card->dev, "Could not create Mixer\n");
179		return err;
180	}
181
182	return 0;
183}
184
185static int snd_cs5530_probe(struct pci_dev *pci,
186			    const struct pci_device_id *pci_id)
187{
188	static int dev;
189	struct snd_card *card;
190	struct snd_cs5530 *chip;
191	int err;
192
193	if (dev >= SNDRV_CARDS)
194		return -ENODEV;
195	if (!enable[dev]) {
196		dev++;
197		return -ENOENT;
198	}
199
200	err = snd_devm_card_new(&pci->dev, index[dev], id[dev], THIS_MODULE,
201				sizeof(*chip), &card);
202	if (err < 0)
203		return err;
204	chip = card->private_data;
205
206	err = snd_cs5530_create(card, pci);
207	if (err < 0)
208		return err;
209
210	strscpy(card->driver, "CS5530");
211	strscpy(card->shortname, "CS5530 Audio");
212	sprintf(card->longname, "%s at 0x%lx", card->shortname, chip->pci_base);
213
214	err = snd_card_register(card);
215	if (err < 0)
216		return err;
217	pci_set_drvdata(pci, card);
218	dev++;
219	return 0;
220}
221
222static struct pci_driver cs5530_driver = {
223	.name = KBUILD_MODNAME,
224	.id_table = snd_cs5530_ids,
225	.probe = snd_cs5530_probe,
226};
227
228module_pci_driver(cs5530_driver);