trident.c

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/*
 *
 *	Trident 4D-Wave/SiS 7018/ALi 5451 OSS driver for Linux 2.2.x
 *
 *	Driver: Alan Cox <[e-mail]>
 *
 *  Built from:
 *	Low level code: <[e-mail]> from ALSA
 *	Framework: Thomas Sailer <[e-mail]>
 *	Extended by: Zach Brown <[e-mail]>  
 *
 *  Hacked up by:
 *	Aaron Holtzman <[e-mail]>
 *	Ollie Lho <[e-mail]> SiS 7018 Audio Core Support
 *	Ching-Ling Lee <[e-mail]> ALi 5451 Audio Core Support 
 *
 *
 *	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., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *  History
 *  v0.14.6 
 *	Nov 1 2000 Ching-Ling Lee
 *	Fix the bug of memory leak when swithing 5.1-channels to 2 channels.
 *	Add lock protection into dynamic changing format of data.
 *	Oct 18 2000 Ching-Ling Lee
 *	5.1-channels support for ALi
 *	June 28 2000 Ching-Ling Lee
 *	S/PDIF out/in(playback/record) support for ALi 1535+, using /proc to be selected by user
 *	Simple Power Management support for ALi
 *  v0.14.5 May 23 2000 Ollie Lho
 *  	Misc bug fix from the Net
 *  v0.14.4 May 20 2000 Aaron Holtzman
 *  	Fix kfree'd memory access in release
 *  	Fix race in open while looking for a free virtual channel slot
 *  	remove open_wait wq (which appears to be unused)
 *  v0.14.3 May 10 2000 Ollie Lho
 *	fixed a small bug in trident_update_ptr, xmms 1.0.1 no longer uses 100% CPU
 *  v0.14.2 Mar 29 2000 Ching-Ling Lee
 *	Add clear to silence advance in trident_update_ptr 
 *	fix invalid data of the end of the sound
 *  v0.14.1 Mar 24 2000 Ching-Ling Lee
 *	ALi 5451 support added, playback and recording O.K.
 *	ALi 5451 originally developed and structured based on sonicvibes, and
 *	suggested to merge into this file by Alan Cox.
 *  v0.14 Mar 15 2000 Ollie Lho
 *	5.1 channel output support with channel binding. What's the Matrix ?
 *  v0.13.1 Mar 10 2000 Ollie Lho
 *	few minor bugs on dual codec support, needs more testing
 *  v0.13 Mar 03 2000 Ollie Lho
 *	new pci_* for 2.4 kernel, back ported to 2.2
 *  v0.12 Feb 23 2000 Ollie Lho
 *	Preliminary Recording support
 *  v0.11.2 Feb 19 2000 Ollie Lho
 *	removed incomplete full-dulplex support
 *  v0.11.1 Jan 28 2000 Ollie Lho
 *	small bug in setting sample rate for 4d-nx (reported by Aaron)
 *  v0.11 Jan 27 2000 Ollie Lho
 *	DMA bug, scheduler latency, second try
 *  v0.10 Jan 24 2000 Ollie Lho
 *	DMA bug fixed, found kernel scheduling problem
 *  v0.09 Jan 20 2000 Ollie Lho
 *	Clean up of channel register access routine (prepare for channel binding)
 *  v0.08 Jan 14 2000 Ollie Lho
 *	Isolation of AC97 codec code
 *  v0.07 Jan 13 2000 Ollie Lho
 *	Get rid of ugly old low level access routines (e.g. CHRegs.lp****)
 *  v0.06 Jan 11 2000 Ollie Lho
 *	Preliminary support for dual (more ?) AC97 codecs
 *  v0.05 Jan 08 2000 Luca Montecchiani <[e-mail]>
 *	adapt to 2.3.x new __setup/__init call
 *  v0.04 Dec 31 1999 Ollie Lho
 *	Multiple Open, using Middle Loop Interrupt to smooth playback
 *  v0.03 Dec 24 1999 Ollie Lho
 *	mem leak in prog_dmabuf and dealloc_dmabuf removed
 *  v0.02 Dec 15 1999 Ollie Lho
 *	SiS 7018 support added, playback O.K.
 *  v0.01 Alan Cox et. al.
 *	Initial Release in kernel 2.3.30, does not work
 * 
 *  ToDo
 *	Clean up of low level channel register access code. (done)
 *	Fix the bug on dma buffer management in update_ptr, read/write, drain_dac (done)
 *	Dual AC97 codecs support (done)
 *	Recording support (done)
 *	Mmap support
 *	"Channel Binding" ioctl extension (done)
 *	new pci device driver interface for 2.4 kernel (done)
 */

#include <linux/config.h>
#include <linux/module.h>
#include <linux/version.h>
#include <linux/string.h>
#include <linux/ctype.h>
#include <linux/ioport.h>
#include <linux/sched.h>
#include <linux/delay.h>
#include <linux/sound.h>
#include <linux/malloc.h>
#include <linux/soundcard.h>
#include <linux/pci.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <linux/init.h>
#include <linux/poll.h>
#include <linux/spinlock.h>
#include <linux/smp_lock.h>
#include <linux/ac97_codec.h>
#include <linux/wrapper.h>
#include <asm/uaccess.h>
#include <asm/hardirq.h>
#include <linux/bitops.h>
#include <linux/proc_fs.h>

#include "trident.h"

#include <linux/pm.h>

#define DRIVER_VERSION "0.14.6"

/* magic numbers to protect our data structures */
#define TRIDENT_CARD_MAGIC	0x5072696E /* "Prin" */
#define TRIDENT_STATE_MAGIC	0x63657373 /* "cess" */

#define TRIDENT_DMA_MASK	0x3fffffff /* DMA buffer mask for pci_alloc_consist */

#define NR_HW_CH		32

/* maxinum nuber of AC97 codecs connected, AC97 2.0 defined 4, but 7018 and 4D-NX only
   have 2 SDATA_IN lines (currently) */
#define NR_AC97		2

/* minor number of /dev/swmodem (temporary, experimental) */
#define SND_DEV_SWMODEM	7

static const unsigned ali_multi_channels_5_1[] = { ALI_CENTER_CHANNEL, ALI_LEF_CHANNEL, ALI_SURR_LEFT_CHANNEL, ALI_SURR_RIGHT_CHANNEL};

static const unsigned sample_size[] = { 1, 2, 2, 4 };
static const unsigned sample_shift[] = { 0, 1, 1, 2 };

static const char invalid_magic[] = KERN_CRIT "trident: invalid magic value in %s\n";

enum {
	TRIDENT_4D_DX = 0,
	TRIDENT_4D_NX,
	SIS_7018,
	ALI_5451
};

static char * card_names[] = {
	"Trident 4DWave DX",
	"Trident 4DWave NX",
	"SiS 7018 PCI Audio",
	"ALi Audio Accelerator"
};

static struct pci_device_id trident_pci_tbl [] __devinitdata = {
	{PCI_VENDOR_ID_TRIDENT, PCI_DEVICE_ID_TRIDENT_4DWAVE_DX,
	 PCI_ANY_ID, PCI_ANY_ID, 0, 0, TRIDENT_4D_DX},
	{PCI_VENDOR_ID_TRIDENT, PCI_DEVICE_ID_TRIDENT_4DWAVE_NX,
	 PCI_ANY_ID, PCI_ANY_ID, 0, 0, TRIDENT_4D_NX},
	{PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_7018,
	 PCI_ANY_ID, PCI_ANY_ID, 0, 0, SIS_7018},
	{PCI_VENDOR_ID_ALI, PCI_DEVICE_ID_ALI_5451,
	 PCI_ANY_ID, PCI_ANY_ID, 0, 0, ALI_5451},
	{0,}
};

MODULE_DEVICE_TABLE (pci, trident_pci_tbl);

/* "software" or virtual channel, an instance of opened /dev/dsp */
struct trident_state {
	unsigned int magic;
	struct trident_card *card;	/* Card info */

	/* file mode */
	mode_t open_mode;

	/* virtual channel number */
	int virt;

	struct dmabuf {
		/* wave sample stuff */
		unsigned int rate;
		unsigned char fmt, enable;

		/* hardware channel */
		struct trident_channel *channel;

		/* OSS buffer management stuff */
		void *rawbuf;
		dma_addr_t dma_handle;
		unsigned buforder;
		unsigned numfrag;
		unsigned fragshift;

		/* our buffer acts like a circular ring */
		unsigned hwptr;		/* where dma last started, updated by update_ptr */
		unsigned swptr;		/* where driver last clear/filled, updated by read/write */
		int count;		/* bytes to be comsumed or been generated by dma machine */
		unsigned total_bytes;	/* total bytes dmaed by hardware */

		unsigned error;		/* number of over/underruns */
		wait_queue_head_t wait;	/* put process on wait queue when no more space in buffer */

		/* redundant, but makes calculations easier */
		unsigned fragsize;
		unsigned dmasize;
		unsigned fragsamples;

		/* OSS stuff */
		unsigned mapped:1;
		unsigned ready:1;
		unsigned endcleared:1;
		unsigned update_flag;
		unsigned ossfragshift;
		int ossmaxfrags;
		unsigned subdivision;
		
	} dmabuf;

	/* 5.1channels */	
	struct trident_state *other_states[4];
	int multi_channels_adjust_count;
	unsigned chans_num;
	unsigned fmt_flag:1;
};

/* hardware channels */
struct trident_channel {
	int  num;	/* channel number */
	u32 lba;	/* Loop Begine Address, where dma buffer starts */
	u32 eso;	/* End Sample Offset, wehre dma buffer ends (in the unit of samples) */
	u32 delta;	/* delta value, sample rate / 48k for playback, 48k/sample rate for recording */
	u16 attribute;	/* control where PCM data go and come  */
	u16 fm_vol;
	u32 control;	/* signed/unsigned, 8/16 bits, mono/stereo */
};

struct trident_pcm_bank_address {
	u32 start;
	u32 stop;
	u32 aint;
	u32 aint_en;
};
static struct trident_pcm_bank_address bank_a_addrs =
{
	T4D_START_A,
	T4D_STOP_A,
	T4D_AINT_A,
	T4D_AINTEN_A
};
static struct trident_pcm_bank_address bank_b_addrs =
{
	T4D_START_B,
	T4D_STOP_B,
	T4D_AINT_B,
	T4D_AINTEN_B
};
struct trident_pcm_bank {
	/* register addresses to control bank operations */
	struct trident_pcm_bank_address *addresses;
	/* each bank has 32 channels */
	u32 bitmap; /* channel allocation bitmap */
	struct trident_channel channels[32];
};

struct trident_card {
	unsigned int magic;

	/* We keep trident cards in a linked list */
	struct trident_card *next;

	/* single open lock mechanism, only used for recording */
	struct semaphore open_sem;

	/* The trident has a certain amount of cross channel interaction
	   so we use a single per card lock */
	spinlock_t lock;

	/* PCI device stuff */
	struct pci_dev * pci_dev;
	u16 pci_id;
	u8 revision;

	/* soundcore stuff */
	int dev_audio;

	/* structures for abstraction of hardware facilities, codecs, banks and channels*/
	struct ac97_codec *ac97_codec[NR_AC97];
	struct trident_pcm_bank banks[NR_BANKS];
	struct trident_state *states[NR_HW_CH];

	/* hardware resources */
	unsigned long iobase;
	u32 irq;
	
	/* Function support */
	struct trident_channel *(*alloc_pcm_channel)(struct trident_card *);
	struct trident_channel *(*alloc_rec_pcm_channel)(struct trident_card *);
	void (*free_pcm_channel)(struct trident_card *, unsigned int chan);
	void (*address_interrupt)(struct trident_card *);
};

/* table to map from CHANNELMASK to channel attribute for SiS 7018 */
static u16 mask2attr [] =
{
	PCM_LR, PCM_LR, SURR_LR, CENTER_LFE,
	HSET, MIC, MODEM_LINE1, MODEM_LINE2,
	I2S_LR, SPDIF_LR
};
/* table to map from channel attribute to CHANNELMASK for SiS 7018 */
static int attr2mask [] = {
	DSP_BIND_MODEM1, DSP_BIND_MODEM2, DSP_BIND_FRONT, DSP_BIND_HANDSET,
	DSP_BIND_I2S, DSP_BIND_CENTER_LFE, DSP_BIND_SURR, DSP_BIND_SPDIF
};

static struct trident_card *devs;

static void trident_ac97_set(struct ac97_codec *codec, u8 reg, u16 val);
static u16 trident_ac97_get(struct ac97_codec *codec, u8 reg);

static int trident_open_mixdev(struct inode *inode, struct file *file);
static int trident_ioctl_mixdev(struct inode *inode, struct file *file, unsigned int cmd,
				unsigned long arg);
static loff_t trident_llseek(struct file *file, loff_t offset, int origin);

static void ali_ac97_set(struct ac97_codec *codec, u8 reg, u16 val);
static u16 ali_ac97_get(struct ac97_codec *codec, u8 reg);
static void ali_set_spdif_out_rate(struct trident_card *card, unsigned int rate);
static void ali_enable_special_channel(struct trident_state *stat);
static struct trident_channel *ali_alloc_rec_pcm_channel(struct trident_card *card);
static struct trident_channel *ali_alloc_pcm_channel(struct trident_card *card);
static int ali_pm_callback(struct pm_dev *dev, pm_request_t rqst, void *data);
static void ali_restore_regs(struct trident_card *card);
static void ali_save_regs(struct trident_card *card);
static void ali_free_pcm_channel(struct trident_card *card, unsigned int channel);
static int ali_setup_multi_channels(struct trident_card *card, int chan_nums);
static unsigned int ali_get_spdif_in_rate(struct trident_card *card);
static void ali_setup_spdif_in(struct trident_card *card);
static void ali_disable_spdif_in(struct trident_card *card);
static void ali_disable_special_channel(struct trident_card *card, int ch);
static void ali_setup_spdif_out(struct trident_card *card, int flag);
static int ali_write_5_1(struct trident_state *state, const char *buffer,int cnt_for_multi_channel, unsigned int *copy_count, unsigned int *state_cnt);
static int ali_allocate_other_states_resources(struct trident_state *state, int chan_nums);
static void ali_free_other_states_resources(struct trident_state *state);


/* save registers for ALi Power Management */
static struct ali_saved_registers {
	unsigned long global_regs[ALI_GLOBAL_REGS];
	unsigned long channel_regs[ALI_CHANNELS][ALI_CHANNEL_REGS];
	unsigned mixer_regs[ALI_MIXER_REGS];
} ali_registers;

#define seek_offset(dma_ptr, buffer, cnt, offset, copy_count)	(dma_ptr) += (offset);	\
							(buffer) += (offset);	\
							(cnt) -= (offset);	\
							(copy_count) += (offset);

#define lock_set_fmt(state)	{spin_lock_irqsave(&state->card->lock, flags);			\
				if (state->fmt_flag) {						\
					spin_unlock_irqrestore(&state->card->lock, flags);	\
					return -EFAULT;						\
				}								\
				state->fmt_flag = 1;						\
				spin_unlock_irqrestore(&state->card->lock, flags);}
				
#define unlock_set_fmt(state)	{spin_lock_irqsave(&state->card->lock, flags);		\
				state->fmt_flag = 0;					\
				spin_unlock_irqrestore(&state->card->lock, flags);}

static int trident_enable_loop_interrupts(struct trident_card * card)
{
	u32 global_control;

	global_control = inl(TRID_REG(card, T4D_LFO_GC_CIR));

	switch (card->pci_id)
	{
	case PCI_DEVICE_ID_SI_7018:
		global_control |= (ENDLP_IE | MIDLP_IE| BANK_B_EN);
		break;
	case PCI_DEVICE_ID_ALI_5451:
	case PCI_DEVICE_ID_TRIDENT_4DWAVE_DX:
	case PCI_DEVICE_ID_TRIDENT_4DWAVE_NX:
		global_control |= (ENDLP_IE | MIDLP_IE);
		break;
	default:
		return FALSE;
	}

	outl(global_control, TRID_REG(card, T4D_LFO_GC_CIR));

#ifdef DEBUG
	printk("trident: Enable Loop Interrupts, globctl = 0x%08X\n",
	       global_control);
#endif
	return (TRUE);
}

static int trident_disable_loop_interrupts(struct trident_card * card)
{
	u32 global_control;

	global_control = inl(TRID_REG(card, T4D_LFO_GC_CIR));
	global_control &= ~(ENDLP_IE | MIDLP_IE);
	outl(global_control, TRID_REG(card, T4D_LFO_GC_CIR));

#ifdef DEBUG
	printk("trident: Disabled Loop Interrupts, globctl = 0x%08X\n",
	       global_control);
#endif
	return (TRUE);
}

static void trident_enable_voice_irq(struct trident_card * card, unsigned int channel)
{
	unsigned int mask = 1 << (channel & 0x1f);
	struct trident_pcm_bank *bank = &card->banks[channel >> 5];
	u32 reg, addr = bank->addresses->aint_en;

	reg = inl(TRID_REG(card, addr));
	reg |= mask;
	outl(reg, TRID_REG(card, addr));

#ifdef DEBUG
	reg = inl(TRID_REG(card, T4D_AINTEN_B));
	printk("trident: enabled IRQ on channel %d, AINTEN_B = 0x%08x\n",
	       channel, reg);
#endif
}