als4000.c

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/*
 *  card-als4000.c - driver for Avance Logic ALS4000 based soundcards.
 *  Copyright (C) 2000 by Bart Hartgers <[e-mail]>,
 *			  Jaroslav Kysela <[e-mail]>
 *  Copyright (C) 2002 by Andreas Mohr <[e-mail]>
 *
 *  Framework borrowed from Massimo Piccioni's card-als100.c.
 *
 * NOTES
 *
 *  Since Avance does not provide any meaningful documentation, and I
 *  bought an ALS4000 based soundcard, I was forced to base this driver
 *  on reverse engineering.
 *
 *  Note: this is no longer true. Pretty verbose chip docu (ALS4000a.PDF)
 *  can be found on the ALSA web site.
 *
 *  The ALS4000 seems to be the PCI-cousin of the ALS100. It contains an
 *  ALS100-like SB DSP/mixer, an OPL3 synth, a MPU401 and a gameport 
 *  interface. These subsystems can be mapped into ISA io-port space, 
 *  using the PCI-interface. In addition, the PCI-bit provides DMA and IRQ 
 *  services to the subsystems.
 * 
 * While ALS4000 is very similar to a SoundBlaster, the differences in
 * DMA and capturing require more changes to the SoundBlaster than
 * desirable, so I made this separate driver.
 * 
 * The ALS4000 can do real full duplex playback/capture.
 *
 * FMDAC:
 * - 0x4f -> port 0x14
 * - port 0x15 |= 1
 *
 * Enable/disable 3D sound:
 * - 0x50 -> port 0x14
 * - change bit 6 (0x40) of port 0x15
 *
 * Set QSound:
 * - 0xdb -> port 0x14
 * - set port 0x15:
 *   0x3e (mode 3), 0x3c (mode 2), 0x3a (mode 1), 0x38 (mode 0)
 *
 * Set KSound:
 * - value -> some port 0x0c0d
 *
 *  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
 */

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

MODULE_AUTHOR("Bart Hartgers <[e-mail]>");
MODULE_DESCRIPTION("Avance Logic ALS4000");
MODULE_LICENSE("GPL");
MODULE_SUPPORTED_DEVICE("{{Avance Logic,ALS4000}}");

#if defined(CONFIG_GAMEPORT) || (defined(MODULE) && defined(CONFIG_GAMEPORT_MODULE))
#define SUPPORT_JOYSTICK 1
#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_port[SNDRV_CARDS];
#endif
static int boot_devs;

module_param_array(index, int, boot_devs, 0444);
MODULE_PARM_DESC(index, "Index value for ALS4000 soundcard.");
module_param_array(id, charp, boot_devs, 0444);
MODULE_PARM_DESC(id, "ID string for ALS4000 soundcard.");
module_param_array(enable, bool, boot_devs, 0444);
MODULE_PARM_DESC(enable, "Enable ALS4000 soundcard.");
#ifdef SUPPORT_JOYSTICK
module_param_array(joystick_port, int, boot_devs, 0444);
MODULE_PARM_DESC(joystick_port, "Joystick port address for ALS4000 soundcard. (0 = disabled)");
#endif

typedef struct {
	struct pci_dev *pci;
	unsigned long gcr;
#ifdef SUPPORT_JOYSTICK
	struct gameport gameport;
	struct resource *res_joystick;
#endif
} snd_card_als4000_t;

static struct pci_device_id snd_als4000_ids[] = {
	{ 0x4005, 0x4000, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, },   /* ALS4000 */
	{ 0, }
};

MODULE_DEVICE_TABLE(pci, snd_als4000_ids);

static inline void snd_als4000_gcr_write_addr(unsigned long port, u32 reg, u32 val)
{
	outb(reg, port+0x0c);
	outl(val, port+0x08);
}

static inline void snd_als4000_gcr_write(sb_t *sb, u32 reg, u32 val)
{
	snd_als4000_gcr_write_addr(sb->alt_port, reg, val);
}	

static inline u32 snd_als4000_gcr_read_addr(unsigned long port, u32 reg)
{
	outb(reg, port+0x0c);
	return inl(port+0x08);
}

static inline u32 snd_als4000_gcr_read(sb_t *sb, u32 reg)
{
	return snd_als4000_gcr_read_addr(sb->alt_port, reg);
}

static void snd_als4000_set_rate(sb_t *chip, unsigned int rate)
{
	if (!(chip->mode & SB_RATE_LOCK)) {
		snd_sbdsp_command(chip, SB_DSP_SAMPLE_RATE_OUT);
		snd_sbdsp_command(chip, rate>>8);
		snd_sbdsp_command(chip, rate);
	}
}

static void snd_als4000_set_capture_dma(sb_t *chip, dma_addr_t addr, unsigned size)
{
	snd_als4000_gcr_write(chip, 0xa2, addr);
	snd_als4000_gcr_write(chip, 0xa3, (size-1));
}

static void snd_als4000_set_playback_dma(sb_t *chip, dma_addr_t addr, unsigned size)
{
	snd_als4000_gcr_write(chip, 0x91, addr);
	snd_als4000_gcr_write(chip, 0x92, (size-1)|0x180000);
}

#define ALS4000_FORMAT_SIGNED	(1<<0)
#define ALS4000_FORMAT_16BIT	(1<<1)
#define ALS4000_FORMAT_STEREO	(1<<2)

static int snd_als4000_get_format(snd_pcm_runtime_t *runtime)
{
	int result;

	result = 0;
	if (snd_pcm_format_signed(runtime->format))
		result |= ALS4000_FORMAT_SIGNED;
	if (snd_pcm_format_physical_width(runtime->format) == 16)
		result |= ALS4000_FORMAT_16BIT;
	if (runtime->channels > 1)
		result |= ALS4000_FORMAT_STEREO;
	return result;
}

/* structure for setting up playback */
static struct {
	unsigned char dsp_cmd, dma_on, dma_off, format;
} playback_cmd_vals[]={
/* ALS4000_FORMAT_U8_MONO */
{ SB_DSP4_OUT8_AI, SB_DSP_DMA8_ON, SB_DSP_DMA8_OFF, SB_DSP4_MODE_UNS_MONO },
/* ALS4000_FORMAT_S8_MONO */	
{ SB_DSP4_OUT8_AI, SB_DSP_DMA8_ON, SB_DSP_DMA8_OFF, SB_DSP4_MODE_SIGN_MONO },
/* ALS4000_FORMAT_U16L_MONO */
{ SB_DSP4_OUT16_AI, SB_DSP_DMA16_ON, SB_DSP_DMA16_OFF, SB_DSP4_MODE_UNS_MONO },
/* ALS4000_FORMAT_S16L_MONO */
{ SB_DSP4_OUT16_AI, SB_DSP_DMA16_ON, SB_DSP_DMA16_OFF, SB_DSP4_MODE_SIGN_MONO },
/* ALS4000_FORMAT_U8_STEREO */
{ SB_DSP4_OUT8_AI, SB_DSP_DMA8_ON, SB_DSP_DMA8_OFF, SB_DSP4_MODE_UNS_STEREO },
/* ALS4000_FORMAT_S8_STEREO */	
{ SB_DSP4_OUT8_AI, SB_DSP_DMA8_ON, SB_DSP_DMA8_OFF, SB_DSP4_MODE_SIGN_STEREO },
/* ALS4000_FORMAT_U16L_STEREO */
{ SB_DSP4_OUT16_AI, SB_DSP_DMA16_ON, SB_DSP_DMA16_OFF, SB_DSP4_MODE_UNS_STEREO },
/* ALS4000_FORMAT_S16L_STEREO */
{ SB_DSP4_OUT16_AI, SB_DSP_DMA16_ON, SB_DSP_DMA16_OFF, SB_DSP4_MODE_SIGN_STEREO },
};
#define playback_cmd(chip) (playback_cmd_vals[(chip)->playback_format])

/* structure for setting up capture */
enum { CMD_WIDTH8=0x04, CMD_SIGNED=0x10, CMD_MONO=0x80, CMD_STEREO=0xA0 };
static unsigned char capture_cmd_vals[]=
{
CMD_WIDTH8|CMD_MONO,			/* ALS4000_FORMAT_U8_MONO */
CMD_WIDTH8|CMD_SIGNED|CMD_MONO,		/* ALS4000_FORMAT_S8_MONO */	
CMD_MONO,				/* ALS4000_FORMAT_U16L_MONO */
CMD_SIGNED|CMD_MONO,			/* ALS4000_FORMAT_S16L_MONO */
CMD_WIDTH8|CMD_STEREO,			/* ALS4000_FORMAT_U8_STEREO */
CMD_WIDTH8|CMD_SIGNED|CMD_STEREO,	/* ALS4000_FORMAT_S8_STEREO */	
CMD_STEREO,				/* ALS4000_FORMAT_U16L_STEREO */
CMD_SIGNED|CMD_STEREO,			/* ALS4000_FORMAT_S16L_STEREO */
};	
#define capture_cmd(chip) (capture_cmd_vals[(chip)->capture_format])

static int snd_als4000_hw_params(snd_pcm_substream_t * substream,
				 snd_pcm_hw_params_t * hw_params)
{
	return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
}

static int snd_als4000_hw_free(snd_pcm_substream_t * substream)
{
	snd_pcm_lib_free_pages(substream);
	return 0;
}

static int snd_als4000_capture_prepare(snd_pcm_substream_t * substream)
{
	unsigned long flags;
	sb_t *chip = snd_pcm_substream_chip(substream);
	snd_pcm_runtime_t *runtime = substream->runtime;
	unsigned long size;
	unsigned count;

	chip->capture_format = snd_als4000_get_format(runtime);
		
	size = snd_pcm_lib_buffer_bytes(substream);
	count = snd_pcm_lib_period_bytes(substream);
	
	if (chip->capture_format & ALS4000_FORMAT_16BIT)
		count >>=1;
	count--;

	spin_lock_irqsave(&chip->reg_lock, flags);
	snd_als4000_set_rate(chip, runtime->rate);
	snd_als4000_set_capture_dma(chip, runtime->dma_addr, size);
	spin_unlock_irqrestore(&chip->reg_lock, flags);
	spin_lock_irqsave(&chip->mixer_lock, flags );
	snd_sbmixer_write(chip, 0xdc, count);
	snd_sbmixer_write(chip, 0xdd, count>>8);
	spin_unlock_irqrestore(&chip->mixer_lock, flags );
	return 0;
}

static int snd_als4000_playback_prepare(snd_pcm_substream_t *substream)
{
	unsigned long flags;
	sb_t *chip = snd_pcm_substream_chip(substream);
	snd_pcm_runtime_t *runtime = substream->runtime;
	unsigned long size;
	unsigned count;

	chip->playback_format = snd_als4000_get_format(runtime);
	
	size = snd_pcm_lib_buffer_bytes(substream);
	count = snd_pcm_lib_period_bytes(substream);
	
	if (chip->playback_format & ALS4000_FORMAT_16BIT)
		count >>=1;
	count--;
	
	/* FIXME: from second playback on, there's a lot more clicks and pops
	 * involved here than on first playback. Fiddling with
	 * tons of different settings didn't help (DMA, speaker on/off,
	 * reordering, ...). Something seems to get enabled on playback
	 * that I haven't found out how to disable again, which then causes
	 * the switching pops to reach the speakers the next time here. */
	spin_lock_irqsave(&chip->reg_lock, flags);
	snd_als4000_set_rate(chip, runtime->rate);
	snd_als4000_set_playback_dma(chip, runtime->dma_addr, size);
	
	/* SPEAKER_ON not needed, since dma_on seems to also enable speaker */
	/* snd_sbdsp_command(chip, SB_DSP_SPEAKER_ON); */
	snd_sbdsp_command(chip, playback_cmd(chip).dsp_cmd);
	snd_sbdsp_command(chip, playback_cmd(chip).format);
	snd_sbdsp_command(chip, count);
	snd_sbdsp_command(chip, count>>8);
	snd_sbdsp_command(chip, playback_cmd(chip).dma_off);	
	spin_unlock_irqrestore(&chip->reg_lock, flags);
	
	return 0;
}

static int snd_als4000_capture_trigger(snd_pcm_substream_t * substream, int cmd)
{
	sb_t *chip = snd_pcm_substream_chip(substream);
	int result = 0;
	
	spin_lock(&chip->mixer_lock);
	if (cmd == SNDRV_PCM_TRIGGER_START) {
		chip->mode |= SB_RATE_LOCK_CAPTURE;
		snd_sbmixer_write(chip, 0xde, capture_cmd(chip));
	} else if (cmd == SNDRV_PCM_TRIGGER_STOP) {
		chip->mode &= ~SB_RATE_LOCK_CAPTURE;
		snd_sbmixer_write(chip, 0xde, 0);
	} else {
		result = -EINVAL;
	}
	spin_unlock(&chip->mixer_lock);
	return result;
}

static int snd_als4000_playback_trigger(snd_pcm_substream_t * substream, int cmd)
{
	sb_t *chip = snd_pcm_substream_chip(substream);
	int result = 0;

	spin_lock(&chip->reg_lock);
	if (cmd == SNDRV_PCM_TRIGGER_START) {
		chip->mode |= SB_RATE_LOCK_PLAYBACK;
		snd_sbdsp_command(chip, playback_cmd(chip).dma_on);
	} else if (cmd == SNDRV_PCM_TRIGGER_STOP) {
		snd_sbdsp_command(chip, playback_cmd(chip).dma_off);
		chip->mode &= ~SB_RATE_LOCK_PLAYBACK;
	} else {
		result = -EINVAL;
	}
	spin_unlock(&chip->reg_lock);
	return result;
}

static snd_pcm_uframes_t snd_als4000_capture_pointer(snd_pcm_substream_t * substream)
{
	sb_t *chip = snd_pcm_substream_chip(substream);
	unsigned int result;

	spin_lock(&chip->reg_lock);	
	result = snd_als4000_gcr_read(chip, 0xa4) & 0xffff;
	spin_unlock(&chip->reg_lock);
	return bytes_to_frames( substream->runtime, result );
}

static snd_pcm_uframes_t snd_als4000_playback_pointer(snd_pcm_substream_t * substream)
{
	sb_t *chip = snd_pcm_substream_chip(substream);
	unsigned result;

	spin_lock(&chip->reg_lock);	
	result = snd_als4000_gcr_read(chip, 0xa0) & 0xffff;
	spin_unlock(&chip->reg_lock);
	return bytes_to_frames( substream->runtime, result );
}

static irqreturn_t snd_als4000_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
	sb_t *chip = dev_id;
	unsigned gcr_status;
	unsigned sb_status;

	/* find out which bit of the ALS4000 produced the interrupt */
	gcr_status = inb(chip->alt_port + 0xe);

	if ((gcr_status & 0x80) && (chip->playback_substream)) /* playback */
		snd_pcm_period_elapsed(chip->playback_substream);
	if ((gcr_status & 0x40) && (chip->capture_substream)) /* capturing */
		snd_pcm_period_elapsed(chip->capture_substream);
	if ((gcr_status & 0x10) && (chip->rmidi)) /* MPU401 interrupt */
		snd_mpu401_uart_interrupt(irq, chip->rmidi, regs);
	/* release the gcr */
	outb(gcr_status, chip->alt_port + 0xe);
	
	spin_lock(&chip->mixer_lock);