hda_intel.c

一个Linux下的软猫驱动

/*
 *
 *  hda_intel.c - Implementation of primary alsa driver code base for Intel HD Audio.
 *
 *  Copyright(c) 2004 Intel Corporation. All rights reserved.
 *
 *  Copyright (c) 2004 Takashi Iwai <[e-mail]>
 *                     PeiSen Hou <[e-mail]>
 *
 *  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.
 *
 *  CONTACTS:
 *
 *  Matt Jared		[e-mail]
 *  Andy Kopp		[e-mail]
 *  Dan Kogan		[e-mail]
 *
 *  CHANGES:
 *
 *  2004.12.01	Major rewrite by tiwai, merged the work of pshou
 * 
 */

#include <sound/driver.h>
#include <asm/io.h>
#include <linux/version.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <sound/core.h>
#include <sound/initval.h>
#include "hda_codec.h"


static int index = SNDRV_DEFAULT_IDX1;
static char *id = SNDRV_DEFAULT_STR1;
static char *model;
static int position_fix;

module_param(index, int, 0444);
MODULE_PARM_DESC(index, "Index value for Intel HD audio interface.");
module_param(id, charp, 0444);
MODULE_PARM_DESC(id, "ID string for Intel HD audio interface.");
module_param(model, charp, 0444);
MODULE_PARM_DESC(model, "Use the given board model.");
module_param(position_fix, int, 0444);
MODULE_PARM_DESC(position_fix, "Fix DMA pointer (0 = auto, 1 = none, 2 = POSBUF, 3 = FIFO size).");

/* just for backward compatibility */
static int enable;
module_param(enable, bool, 0444);

MODULE_LICENSE("GPL");
MODULE_SUPPORTED_DEVICE("{{Intel, ICH6},"
			 "{Intel, ICH6M},"
			 "{Intel, ICH7},"
			 "{Intel, ESB2},"
			 "{ATI, SB450},"
			 "{VIA, VT8251},"
			 "{VIA, VT8237A},"
			 "{SiS, SIS966},"
			 "{ULI, M5461}}");
MODULE_DESCRIPTION("Intel HDA driver");

#define SFX	"hda-intel: "

/*
 * registers
 */
#define ICH6_REG_GCAP			0x00
#define ICH6_REG_VMIN			0x02
#define ICH6_REG_VMAJ			0x03
#define ICH6_REG_OUTPAY			0x04
#define ICH6_REG_INPAY			0x06
#define ICH6_REG_GCTL			0x08
#define ICH6_REG_WAKEEN			0x0c
#define ICH6_REG_STATESTS		0x0e
#define ICH6_REG_GSTS			0x10
#define ICH6_REG_INTCTL			0x20
#define ICH6_REG_INTSTS			0x24
#define ICH6_REG_WALCLK			0x30
#define ICH6_REG_SYNC			0x34	
#define ICH6_REG_CORBLBASE		0x40
#define ICH6_REG_CORBUBASE		0x44
#define ICH6_REG_CORBWP			0x48
#define ICH6_REG_CORBRP			0x4A
#define ICH6_REG_CORBCTL		0x4c
#define ICH6_REG_CORBSTS		0x4d
#define ICH6_REG_CORBSIZE		0x4e

#define ICH6_REG_RIRBLBASE		0x50
#define ICH6_REG_RIRBUBASE		0x54
#define ICH6_REG_RIRBWP			0x58
#define ICH6_REG_RINTCNT		0x5a
#define ICH6_REG_RIRBCTL		0x5c
#define ICH6_REG_RIRBSTS		0x5d
#define ICH6_REG_RIRBSIZE		0x5e

#define ICH6_REG_IC			0x60
#define ICH6_REG_IR			0x64
#define ICH6_REG_IRS			0x68
#define   ICH6_IRS_VALID	(1<<1)
#define   ICH6_IRS_BUSY		(1<<0)

#define ICH6_REG_DPLBASE		0x70
#define ICH6_REG_DPUBASE		0x74
#define   ICH6_DPLBASE_ENABLE	0x1	/* Enable position buffer */

/* SD offset: SDI0=0x80, SDI1=0xa0, ... SDO3=0x160 */
enum { SDI0, SDI1, SDI2, SDI3, SDO0, SDO1, SDO2, SDO3 };

/* stream register offsets from stream base */
#define ICH6_REG_SD_CTL			0x00
#define ICH6_REG_SD_STS			0x03
#define ICH6_REG_SD_LPIB		0x04
#define ICH6_REG_SD_CBL			0x08
#define ICH6_REG_SD_LVI			0x0c
#define ICH6_REG_SD_FIFOW		0x0e
#define ICH6_REG_SD_FIFOSIZE		0x10
#define ICH6_REG_SD_FORMAT		0x12
#define ICH6_REG_SD_BDLPL		0x18
#define ICH6_REG_SD_BDLPU		0x1c

/* PCI space */
#define ICH6_PCIREG_TCSEL	0x44

/*
 * other constants
 */

/* max number of SDs */
/* ICH, ATI and VIA have 4 playback and 4 capture */
#define ICH6_CAPTURE_INDEX	0
#define ICH6_NUM_CAPTURE	4
#define ICH6_PLAYBACK_INDEX	4
#define ICH6_NUM_PLAYBACK	4

/* ULI has 6 playback and 5 capture */
#define ULI_CAPTURE_INDEX	0
#define ULI_NUM_CAPTURE		5
#define ULI_PLAYBACK_INDEX	5
#define ULI_NUM_PLAYBACK	6

/* this number is statically defined for simplicity */
#define MAX_AZX_DEV		16

/* max number of fragments - we may use more if allocating more pages for BDL */
#define BDL_SIZE		PAGE_ALIGN(8192)
#define AZX_MAX_FRAG		(BDL_SIZE / (MAX_AZX_DEV * 16))
/* max buffer size - no h/w limit, you can increase as you like */
#define AZX_MAX_BUF_SIZE	(1024*1024*1024)
/* max number of PCM devics per card */
#define AZX_MAX_AUDIO_PCMS	6
#define AZX_MAX_MODEM_PCMS	2
#define AZX_MAX_PCMS		(AZX_MAX_AUDIO_PCMS + AZX_MAX_MODEM_PCMS)

/* RIRB int mask: overrun[2], response[0] */
#define RIRB_INT_RESPONSE	0x01
#define RIRB_INT_OVERRUN	0x04
#define RIRB_INT_MASK		0x05

/* STATESTS int mask: SD2,SD1,SD0 */
#define STATESTS_INT_MASK	0x07
#define AZX_MAX_CODECS		4

/* SD_CTL bits */
#define SD_CTL_STREAM_RESET	0x01	/* stream reset bit */
#define SD_CTL_DMA_START	0x02	/* stream DMA start bit */
#define SD_CTL_STREAM_TAG_MASK	(0xf << 20)
#define SD_CTL_STREAM_TAG_SHIFT	20

/* SD_CTL and SD_STS */
#define SD_INT_DESC_ERR		0x10	/* descriptor error interrupt */
#define SD_INT_FIFO_ERR		0x08	/* FIFO error interrupt */
#define SD_INT_COMPLETE		0x04	/* completion interrupt */
#define SD_INT_MASK		(SD_INT_DESC_ERR|SD_INT_FIFO_ERR|SD_INT_COMPLETE)

/* SD_STS */
#define SD_STS_FIFO_READY	0x20	/* FIFO ready */

/* INTCTL and INTSTS */
#define ICH6_INT_ALL_STREAM	0xff		/* all stream interrupts */
#define ICH6_INT_CTRL_EN	0x40000000	/* controller interrupt enable bit */
#define ICH6_INT_GLOBAL_EN	0x80000000	/* global interrupt enable bit */

/* GCTL unsolicited response enable bit */
#define ICH6_GCTL_UREN		(1<<8)

/* GCTL reset bit */
#define ICH6_GCTL_RESET		(1<<0)

/* CORB/RIRB control, read/write pointer */
#define ICH6_RBCTL_DMA_EN	0x02	/* enable DMA */
#define ICH6_RBCTL_IRQ_EN	0x01	/* enable IRQ */
#define ICH6_RBRWP_CLR		0x8000	/* read/write pointer clear */
/* below are so far hardcoded - should read registers in future */
#define ICH6_MAX_CORB_ENTRIES	256
#define ICH6_MAX_RIRB_ENTRIES	256

/* position fix mode */
enum {
	POS_FIX_AUTO,
	POS_FIX_NONE,
	POS_FIX_POSBUF,
	POS_FIX_FIFO,
};

/* Defines for ATI HD Audio support in SB450 south bridge */
#define ATI_SB450_HDAUDIO_MISC_CNTR2_ADDR   0x42
#define ATI_SB450_HDAUDIO_ENABLE_SNOOP      0x02

/* Defines for Nvidia HDA support */
#define NVIDIA_HDA_TRANSREG_ADDR      0x4e
#define NVIDIA_HDA_ENABLE_COHBITS     0x0f

/*
 * Use CORB/RIRB for communication from/to codecs.
 * This is the way recommended by Intel (see below).
 */
#define USE_CORB_RIRB

/*
 */

typedef struct snd_azx azx_t;
typedef struct snd_azx_rb azx_rb_t;
typedef struct snd_azx_dev azx_dev_t;

struct snd_azx_dev {
	u32 *bdl;			/* virtual address of the BDL */
	dma_addr_t bdl_addr;		/* physical address of the BDL */
	volatile u32 *posbuf;			/* position buffer pointer */

	unsigned int bufsize;		/* size of the play buffer in bytes */
	unsigned int fragsize;		/* size of each period in bytes */
	unsigned int frags;		/* number for period in the play buffer */
	unsigned int fifo_size;		/* FIFO size */
	unsigned int last_pos;		/* last updated period position */

	void __iomem *sd_addr;		/* stream descriptor pointer */

	u32 sd_int_sta_mask;		/* stream int status mask */

	/* pcm support */
	snd_pcm_substream_t *substream;	/* assigned substream, set in PCM open */
	unsigned int format_val;	/* format value to be set in the controller and the codec */
	unsigned char stream_tag;	/* assigned stream */
	unsigned char index;		/* stream index */

	unsigned int opened: 1;
	unsigned int running: 1;
	unsigned int period_updating: 1;
};

/* CORB/RIRB */
struct snd_azx_rb {
	u32 *buf;		/* CORB/RIRB buffer
				 * Each CORB entry is 4byte, RIRB is 8byte
				 */
	dma_addr_t addr;	/* physical address of CORB/RIRB buffer */
	/* for RIRB */
	unsigned short rp, wp;	/* read/write pointers */
	int cmds;		/* number of pending requests */
	u32 res;		/* last read value */
};

#ifndef SND_PCI_PM_CALLBACKS
#define snd_card_t struct snd_card
#endif

struct snd_azx {
	snd_card_t *card;
	struct pci_dev *pci;

	/* chip type specific */
	int driver_type;
	int playback_streams;
	int playback_index_offset;
	int capture_streams;
	int capture_index_offset;
	int num_streams;

	/* pci resources */
	unsigned long addr;
	void __iomem *remap_addr;
	int irq;

	/* locks */
	spinlock_t reg_lock;
	struct semaphore open_mutex;

	/* streams (x num_streams) */
	azx_dev_t *azx_dev;

	/* PCM */
	unsigned int pcm_devs;
	snd_pcm_t *pcm[AZX_MAX_PCMS];

	/* HD codec */
	unsigned short codec_mask;
	struct hda_bus *bus;

	/* CORB/RIRB */
	azx_rb_t corb;
	azx_rb_t rirb;

	/* BDL, CORB/RIRB and position buffers */
	struct snd_dma_buffer bdl;
	struct snd_dma_buffer rb;
	struct snd_dma_buffer posbuf;

	/* flags */
	int position_fix;
	unsigned int initialized: 1;
};

/* driver types */
enum {
	AZX_DRIVER_ICH,
	AZX_DRIVER_ATI,
	AZX_DRIVER_VIA,
	AZX_DRIVER_SIS,
	AZX_DRIVER_ULI,
	AZX_DRIVER_NVIDIA,
};

static char *driver_short_names[] __devinitdata = {
	[AZX_DRIVER_ICH] = "HDA Intel",
	[AZX_DRIVER_ATI] = "HDA ATI SB",
	[AZX_DRIVER_VIA] = "HDA VIA VT82xx",
	[AZX_DRIVER_SIS] = "HDA SIS966",
	[AZX_DRIVER_ULI] = "HDA ULI M5461",
	[AZX_DRIVER_NVIDIA] = "HDA NVidia",
};

/*
 * macros for easy use
 */
#define azx_writel(chip,reg,value) \
	writel(value, (chip)->remap_addr + ICH6_REG_##reg)
#define azx_readl(chip,reg) \
	readl((chip)->remap_addr + ICH6_REG_##reg)
#define azx_writew(chip,reg,value) \
	writew(value, (chip)->remap_addr + ICH6_REG_##reg)
#define azx_readw(chip,reg) \
	readw((chip)->remap_addr + ICH6_REG_##reg)
#define azx_writeb(chip,reg,value) \
	writeb(value, (chip)->remap_addr + ICH6_REG_##reg)
#define azx_readb(chip,reg) \
	readb((chip)->remap_addr + ICH6_REG_##reg)

#define azx_sd_writel(dev,reg,value) \
	writel(value, (dev)->sd_addr + ICH6_REG_##reg)
#define azx_sd_readl(dev,reg) \
	readl((dev)->sd_addr + ICH6_REG_##reg)
#define azx_sd_writew(dev,reg,value) \
	writew(value, (dev)->sd_addr + ICH6_REG_##reg)
#define azx_sd_readw(dev,reg) \
	readw((dev)->sd_addr + ICH6_REG_##reg)
#define azx_sd_writeb(dev,reg,value) \
	writeb(value, (dev)->sd_addr + ICH6_REG_##reg)
#define azx_sd_readb(dev,reg) \
	readb((dev)->sd_addr + ICH6_REG_##reg)

/* for pcm support */
#define get_azx_dev(substream) (azx_dev_t*)(substream->runtime->private_data)

/* Get the upper 32bit of the given dma_addr_t
 * Compiler should optimize and eliminate the code if dma_addr_t is 32bit
 */
#define upper_32bit(addr) (sizeof(addr) > 4 ? (u32)((addr) >> 32) : (u32)0)


/*
 * Interface for HD codec
 */

static u32 azx_get_wallclock(struct hda_codec *codec)
{
	azx_t *chip = codec->bus->private_data;

	return azx_readl(chip, WALCLK);
}

static u32 azx_get_linkpos(snd_pcm_substream_t *substream)
{
	azx_dev_t *azx_dev = get_azx_dev(substream);

	return azx_sd_readl(azx_dev, SD_LPIB);
}

#ifdef USE_CORB_RIRB
/*
 * CORB / RIRB interface
 */
static int azx_alloc_cmd_io(azx_t *chip)
{
	int err;

	/* single page (at least 4096 bytes) must suffice for both ringbuffes */
	err = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, snd_dma_pci_data(chip->pci),
				  PAGE_SIZE, &chip->rb);
	if (err < 0) {
		snd_printk(KERN_ERR SFX "cannot allocate CORB/RIRB\n");
		return err;
	}
	return 0;
}

static void azx_init_cmd_io(azx_t *chip)
{
	/* CORB set up */
	chip->corb.addr = chip->rb.addr;
	chip->corb.buf = (u32 *)chip->rb.area;
	azx_writel(chip, CORBLBASE, (u32)chip->corb.addr);
	azx_writel(chip, CORBUBASE, upper_32bit(chip->corb.addr));

	/* set the corb size to 256 entries (ULI requires explicitly) */