azt3328.c

Linux Kernel 2.6.9 for OMAP1710

/*
 *  azt3328.c - driver for Aztech AZF3328 based soundcards (e.g. PCI168).
 *  Copyright (C) 2002 by Andreas Mohr <[e-mail]>
 *
 *  Framework borrowed from Bart Hartgers's als4000.c.
 *  Driver developed on PCI168 AP(W) version (PCI rev. 10, subsystem ID 1801),
 *  found in a Fujitsu-Siemens PC ("Cordant", aluminum case).
 *  Other versions are:
 *  PCI168 A(W), sub ID 1800
 *  PCI168 A/AP, sub ID 8000
 *  Please give me feedback in case you try my driver with one of these!!
 *
 * GPL LICENSE
 *  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 of the License, 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.

 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 * NOTES
 *  Since Aztech does not provide any chipset documentation,
 *  even on repeated request to various addresses,
 *  and the answer that was finally given was negative
 *  (and I was stupid enough to manage to get hold of a PCI168 soundcard
 *  in the first place >:-P}),
 *  I was forced to base this driver on reverse engineering
 *  (3 weeks' worth of evenings filled with driver work).
 *  (and no, I did NOT go the easy way: to pick up a PCI128 for 9 Euros)
 *
 *  The AZF3328 chip (note: AZF3328, *not* AZT3328, that's just the driver name
 *  for compatibility reasons) has the following features:
 *
 *  - builtin AC97 conformant codec (SNR over 80dB)
 *    (really AC97 compliant?? I really doubt it when looking
 *    at the mixer register layout)
 *  - builtin genuine OPL3
 *  - full duplex 16bit playback/record at independent sampling rate
 *  - MPU401 (+ legacy address support) FIXME: how to enable legacy addr??
 *  - game port (legacy address support)
 *  - built-in General DirectX timer having a 20 bits counter
 *    with 1us resolution (FIXME: where is it?)
 *  - I2S serial port for external DAC
 *  - supports 33MHz PCI spec 2.1, PCI power management 1.0, compliant with ACPI
 *  - supports hardware volume control
 *  - single chip low cost solution (128 pin QFP)
 *  - supports programmable Sub-vendor and Sub-system ID
 *    required for Microsoft's logo compliance (FIXME: where?)
 *  - PCI168 AP(W) card: power amplifier with 4 Watts/channel at 4 Ohms
 *
 *  Certain PCI versions of this card are susceptible to DMA traffic underruns
 *  in some systems (resulting in sound crackling/clicking/popping),
 *  probably because they don't have a DMA FIFO buffer or so.
 *  Overview (PCI ID/PCI subID/PCI rev.):
 *  - no DMA crackling on SiS735: 0x50DC/0x1801/16
 *  - unknown performance: 0x50DC/0x1801/10
 *  
 *  Crackling happens with VIA chipsets or, in my case, an SiS735, which is
 *  supposed to be very fast and supposed to get rid of crackling much
 *  better than a VIA, yet ironically I still get crackling, like many other
 *  people with the same chipset.
 *  Possible remedies:
 *  - plug card into a different PCI slot, preferrably one that isn't shared
 *    too much (this helps a lot, but not completely!)
 *  - get rid of PCI VGA card, use AGP instead
 *  - upgrade or downgrade BIOS
 *  - fiddle with PCI latency settings (setpci -v -s BUSID latency_timer=XX)
 *    Not too helpful.
 *  - Disable ACPI/power management/"Auto Detect RAM/PCI Clk" in BIOS
 * 
 * BUGS
 *  - when Ctrl-C'ing mpg321, the playback loops a bit
 *    (premature DMA playback reset?)
 *  - full-duplex sometimes breaks (IRQ management issues?).
 *    Once even a spontaneous REBOOT happened!!!
 * 
 * TODO
 *  - test MPU401 MIDI playback etc.
 *  - power management (CONFIG_PM). See e.g. intel8x0 or cs4281.
 *    This would be nice since the chip runs a bit hot, and it's *required*
 *    anyway for proper ACPI power management. In other words: rest
 *    assured that I *will* implement this very soon; as soon as Linux 2.5.x
 *    has power management that's bugfree enough to work properly on my desktop.
 *  - figure out what all unknown port bits are responsible for
 */

#include <sound/driver.h>
#include <asm/io.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/gameport.h>
#include <linux/moduleparam.h>
#include <sound/core.h>
#include <sound/control.h>
#include <sound/pcm.h>
#include <sound/rawmidi.h>
#include <sound/mpu401.h>
#include <sound/opl3.h>
#include <sound/initval.h>
#include "azt3328.h"

MODULE_AUTHOR("Andreas Mohr <[e-mail]>");
MODULE_DESCRIPTION("Aztech AZF3328 (PCI168)");
MODULE_LICENSE("GPL");
MODULE_SUPPORTED_DEVICE("{{Aztech,AZF3328}}");

#if defined(CONFIG_GAMEPORT) || (defined(MODULE) && defined(CONFIG_GAMEPORT_MODULE))
#define SUPPORT_JOYSTICK 1
#endif

#define DEBUG_MISC	0
#define DEBUG_CALLS	0
#define DEBUG_MIXER	0
#define DEBUG_PLAY_REC	0
#define DEBUG_IO	0
#define MIXER_TESTING	0

#if DEBUG_MISC
#define snd_azf3328_dbgmisc(format, args...) printk(KERN_ERR format, ##args)
#else
#define snd_azf3328_dbgmisc(format, args...)
#endif		

#if DEBUG_CALLS
#define snd_azf3328_dbgcalls(format, args...) printk(format, ##args)
#define snd_azf3328_dbgcallenter() printk(KERN_ERR "entering %s\n", __FUNCTION__)
#define snd_azf3328_dbgcallleave() printk(KERN_ERR "leaving %s\n", __FUNCTION__)
#else
#define snd_azf3328_dbgcalls(format, args...)
#define snd_azf3328_dbgcallenter()
#define snd_azf3328_dbgcallleave()
#endif		

#if DEBUG_MIXER
#define snd_azf3328_dbgmixer(format, args...) printk(format, ##args)
#else
#define snd_azf3328_dbgmixer(format, args...)
#endif		

#if DEBUG_PLAY_REC
#define snd_azf3328_dbgplay(format, args...) printk(KERN_ERR format, ##args)
#else
#define snd_azf3328_dbgplay(format, args...)
#endif		

#if DEBUG_IO
#define snd_azf3328_dbgio(chip, where) \
	    printk(KERN_ERR "%s: IDX_IO_PLAY_FLAGS %04x, IDX_IO_PLAY_IRQMASK %04x, IDX_IO_IRQSTATUS %04x\n", where, inw(chip->codec_port+IDX_IO_PLAY_FLAGS), inw(chip->codec_port+IDX_IO_PLAY_IRQMASK), inw(chip->codec_port+IDX_IO_IRQSTATUS))
#else
#define snd_azf3328_dbgio(chip, where)
#endif
	    
static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;	/* Index 0-MAX */
static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;	/* ID for this card */
static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;	/* Enable this card */
#ifdef SUPPORT_JOYSTICK
static int joystick[SNDRV_CARDS];
#endif
static int boot_devs;

module_param_array(index, int, boot_devs, 0444);
MODULE_PARM_DESC(index, "Index value for AZF3328 soundcard.");
module_param_array(id, charp, boot_devs, 0444);
MODULE_PARM_DESC(id, "ID string for AZF3328 soundcard.");
module_param_array(enable, bool, boot_devs, 0444);
MODULE_PARM_DESC(enable, "Enable AZF3328 soundcard.");
#ifdef SUPPORT_JOYSTICK
module_param_array(joystick, bool, boot_devs, 0444);
MODULE_PARM_DESC(joystick, "Enable joystick for AZF3328 soundcard.");
#endif

typedef struct _snd_azf3328 azf3328_t;

struct _snd_azf3328 {
	int irq;

	unsigned long codec_port;
	unsigned long io2_port;
	unsigned long mpu_port;
	unsigned long synth_port;
	unsigned long mixer_port;

#ifdef SUPPORT_JOYSTICK
	struct gameport gameport;
	struct resource *res_joystick;
#endif

	struct pci_dev *pci;
	snd_card_t *card;

	snd_pcm_t *pcm;
	snd_rawmidi_t *rmidi;
	snd_pcm_substream_t *playback_substream;
	snd_pcm_substream_t *capture_substream;
	unsigned int is_playing;
	unsigned int is_recording;

	spinlock_t reg_lock;
};

static struct pci_device_id snd_azf3328_ids[] = {
	{ 0x122D, 0x50DC, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },   /* PCI168/3328 */
	{ 0x122D, 0x80DA, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },   /* 3328 */
	{ 0, }
};

MODULE_DEVICE_TABLE(pci, snd_azf3328_ids);

void snd_azf3328_io2_write(azf3328_t *chip, int reg, unsigned char value)
{
	outb(value, chip->io2_port + reg);
}

unsigned char snd_azf3328_io2_read(azf3328_t *chip, int reg)
{
	return inb(chip->io2_port + reg);
}

void snd_azf3328_mixer_write(azf3328_t *chip, int reg, unsigned long value, int type)
{
	switch(type) {
	case WORD_VALUE:
		outw(value, chip->mixer_port + reg);
		break;
	case DWORD_VALUE:
		outl(value, chip->mixer_port + reg);
		break;
	case BYTE_VALUE:
		outb(value, chip->mixer_port + reg);
		break;
	}
}

unsigned long snd_azf3328_mixer_read(azf3328_t *chip, int reg, int type)
{
	unsigned long res = 0;

	switch(type) {
	case WORD_VALUE:
		res = (unsigned long)inw(chip->mixer_port + reg);
		break;
	case DWORD_VALUE:
		res = (unsigned long)inl(chip->mixer_port + reg);
		break;
	case BYTE_VALUE:
		res = (unsigned long)inb(chip->mixer_port + reg);
		break;
	}

	return res;
}

void snd_azf3328_mixer_set_mute(azf3328_t *chip, int reg, int do_mute)
{
	unsigned char oldval;

	/* the mute bit is on the *second* (i.e. right) register of a
	 * left/right channel setting */
	oldval = inb(chip->mixer_port + reg + 1);
	if (do_mute)
		oldval |= 0x80;
	else
		oldval &= ~0x80;
	outb(oldval, chip->mixer_port + reg + 1);
}

void snd_azf3328_mixer_write_volume_gradually(azf3328_t *chip, int reg, unsigned char dst_vol_left, unsigned char dst_vol_right, int chan_sel, int delay)
{
	unsigned char curr_vol_left = 0, curr_vol_right = 0;
	int left_done = 0, right_done = 0;
	
	snd_azf3328_dbgcallenter();
	if (chan_sel & SET_CHAN_LEFT)
		curr_vol_left  = inb(chip->mixer_port + reg + 1);
	else
		left_done = 1;
	if (chan_sel & SET_CHAN_RIGHT)
		curr_vol_right = inb(chip->mixer_port + reg + 0);
	else
		right_done = 1;
	
	/* take care of muting flag (0x80) contained in left channel */
	if (curr_vol_left & 0x80)
		dst_vol_left |= 0x80;
	else
		dst_vol_left &= ~0x80;

	do
	{
		if (!left_done)
		{
			if (curr_vol_left > dst_vol_left)
				curr_vol_left--;
			else
			if (curr_vol_left < dst_vol_left)
				curr_vol_left++;
			else
			    left_done = 1;
			outb(curr_vol_left, chip->mixer_port + reg + 1);
		}
		if (!right_done)
		{
			if (curr_vol_right > dst_vol_right)
				curr_vol_right--;
			else
			if (curr_vol_right < dst_vol_right)
				curr_vol_right++;
			else
			    right_done = 1;
			/* during volume change, the right channel is crackling
			 * somewhat more than the left channel, unfortunately.
			 * This seems to be a hardware issue. */
			outb(curr_vol_right, chip->mixer_port + reg + 0);
		}
		if (delay)
			mdelay(delay);
	}
	while ((!left_done) || (!right_done));
	snd_azf3328_dbgcallleave();
}

/*
 * general mixer element
 */
typedef struct azf3328_mixer_reg {
	unsigned int reg;
	unsigned int lchan_shift, rchan_shift;
	unsigned int mask;
	unsigned int invert: 1;
	unsigned int stereo: 1;
	unsigned int enum_c: 4;
} azf3328_mixer_reg_t;

#define COMPOSE_MIXER_REG(reg,lchan_shift,rchan_shift,mask,invert,stereo,enum_c) \
 ((reg) | (lchan_shift << 8) | (rchan_shift << 12) | (mask << 16) | (invert << 24) | (stereo << 25) | (enum_c << 26))

static void snd_azf3328_mixer_reg_decode(azf3328_mixer_reg_t *r, unsigned long val)
{
	r->reg = val & 0xff;
	r->lchan_shift = (val >> 8) & 0x0f;
	r->rchan_shift = (val >> 12) & 0x0f;
	r->mask = (val >> 16) & 0xff;
	r->invert = (val >> 24) & 1;
	r->stereo = (val >> 25) & 1;
	r->enum_c = (val >> 26) & 0x0f;
}

/*
 * mixer switches/volumes
 */

#define AZF3328_MIXER_SWITCH(xname, reg, shift, invert) \
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \
  .info = snd_azf3328_info_mixer, \
  .get = snd_azf3328_get_mixer, .put = snd_azf3328_put_mixer, \
  .private_value = COMPOSE_MIXER_REG(reg, shift, 0, 0x1, invert, 0, 0), \
}

#define AZF3328_MIXER_VOL_STEREO(xname, reg, mask, invert) \
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \
  .info = snd_azf3328_info_mixer, \
  .get = snd_azf3328_get_mixer, .put = snd_azf3328_put_mixer, \
  .private_value = COMPOSE_MIXER_REG(reg, 8, 0, mask, invert, 1, 0), \
}

#define AZF3328_MIXER_VOL_MONO(xname, reg, mask, is_right_chan) \
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \
  .info = snd_azf3328_info_mixer, \
  .get = snd_azf3328_get_mixer, .put = snd_azf3328_put_mixer, \
  .private_value = COMPOSE_MIXER_REG(reg, is_right_chan ? 0 : 8, 0, mask, 1, 0, 0), \
}

#define AZF3328_MIXER_VOL_SPECIAL(xname, reg, mask, shift, invert) \