/*
 *   ALSA modem driver for Intel ICH (i8x0) chipsets
 *
 *	Copyright (c) 2000 Jaroslav Kysela <perex@perex.cz>
 *
 *   This is modified (by Sasha Khapyorsky <sashak@alsa-project.org>) version
 *   of ALSA ICH sound driver intel8x0.c .
 *
 *
 *   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 <asm/io.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/moduleparam.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/ac97_codec.h>
#include <sound/info.h>
#include <sound/initval.h>

MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
MODULE_DESCRIPTION("Intel 82801AA,82901AB,i810,i820,i830,i840,i845,MX440; "
		   "SiS 7013; NVidia MCP/2/2S/3 modems");
MODULE_LICENSE("GPL");
MODULE_SUPPORTED_DEVICE("{{Intel,82801AA-ICH},"
		"{Intel,82901AB-ICH0},"
		"{Intel,82801BA-ICH2},"
		"{Intel,82801CA-ICH3},"
		"{Intel,82801DB-ICH4},"
		"{Intel,ICH5},"
		"{Intel,ICH6},"
		"{Intel,ICH7},"
	        "{Intel,MX440},"
		"{SiS,7013},"
		"{NVidia,NForce Modem},"
		"{NVidia,NForce2 Modem},"
		"{NVidia,NForce2s Modem},"
		"{NVidia,NForce3 Modem},"
		"{AMD,AMD768}}");

static int index = -2; /* Exclude the first card */
static char *id = SNDRV_DEFAULT_STR1;	/* ID for this card */
static int ac97_clock;

module_param(index, int, 0444);
MODULE_PARM_DESC(index, "Index value for Intel i8x0 modemcard.");
module_param(id, charp, 0444);
MODULE_PARM_DESC(id, "ID string for Intel i8x0 modemcard.");
module_param(ac97_clock, int, 0444);
MODULE_PARM_DESC(ac97_clock, "AC'97 codec clock (0 = auto-detect).");

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

/*
 *  Direct registers
 */
enum { DEVICE_INTEL, DEVICE_SIS, DEVICE_ALI, DEVICE_NFORCE };

#define ICHREG(x) ICH_REG_##x

#define DEFINE_REGSET(name,base) \
enum { \
	ICH_REG_##name##_BDBAR	= base + 0x0,	/* dword - buffer descriptor list base address */ \
	ICH_REG_##name##_CIV	= base + 0x04,	/* byte - current index value */ \
	ICH_REG_##name##_LVI	= base + 0x05,	/* byte - last valid index */ \
	ICH_REG_##name##_SR	= base + 0x06,	/* byte - status register */ \
	ICH_REG_##name##_PICB	= base + 0x08,	/* word - position in current buffer */ \
	ICH_REG_##name##_PIV	= base + 0x0a,	/* byte - prefetched index value */ \
	ICH_REG_##name##_CR	= base + 0x0b,	/* byte - control register */ \
};

/* busmaster blocks */
DEFINE_REGSET(OFF, 0);		/* offset */

/* values for each busmaster block */

/* LVI */
#define ICH_REG_LVI_MASK		0x1f

/* SR */
#define ICH_FIFOE			0x10	/* FIFO error */
#define ICH_BCIS			0x08	/* buffer completion interrupt status */
#define ICH_LVBCI			0x04	/* last valid buffer completion interrupt */
#define ICH_CELV			0x02	/* current equals last valid */
#define ICH_DCH				0x01	/* DMA controller halted */

/* PIV */
#define ICH_REG_PIV_MASK		0x1f	/* mask */

/* CR */
#define ICH_IOCE			0x10	/* interrupt on completion enable */
#define ICH_FEIE			0x08	/* fifo error interrupt enable */
#define ICH_LVBIE			0x04	/* last valid buffer interrupt enable */
#define ICH_RESETREGS			0x02	/* reset busmaster registers */
#define ICH_STARTBM			0x01	/* start busmaster operation */


/* global block */
#define ICH_REG_GLOB_CNT		0x3c	/* dword - global control */
#define   ICH_TRIE		0x00000040	/* tertiary resume interrupt enable */
#define   ICH_SRIE		0x00000020	/* secondary resume interrupt enable */
#define   ICH_PRIE		0x00000010	/* primary resume interrupt enable */
#define   ICH_ACLINK		0x00000008	/* AClink shut off */
#define   ICH_AC97WARM		0x00000004	/* AC'97 warm reset */
#define   ICH_AC97COLD		0x00000002	/* AC'97 cold reset */
#define   ICH_GIE		0x00000001	/* GPI interrupt enable */
#define ICH_REG_GLOB_STA		0x40	/* dword - global status */
#define   ICH_TRI		0x20000000	/* ICH4: tertiary (AC_SDIN2) resume interrupt */
#define   ICH_TCR		0x10000000	/* ICH4: tertiary (AC_SDIN2) codec ready */
#define   ICH_BCS		0x08000000	/* ICH4: bit clock stopped */
#define   ICH_SPINT		0x04000000	/* ICH4: S/PDIF interrupt */
#define   ICH_P2INT		0x02000000	/* ICH4: PCM2-In interrupt */
#define   ICH_M2INT		0x01000000	/* ICH4: Mic2-In interrupt */
#define   ICH_SAMPLE_CAP	0x00c00000	/* ICH4: sample capability bits (RO) */
#define   ICH_MULTICHAN_CAP	0x00300000	/* ICH4: multi-channel capability bits (RO) */
#define   ICH_MD3		0x00020000	/* modem power down semaphore */
#define   ICH_AD3		0x00010000	/* audio power down semaphore */
#define   ICH_RCS		0x00008000	/* read completion status */
#define   ICH_BIT3		0x00004000	/* bit 3 slot 12 */
#define   ICH_BIT2		0x00002000	/* bit 2 slot 12 */
#define   ICH_BIT1		0x00001000	/* bit 1 slot 12 */
#define   ICH_SRI		0x00000800	/* secondary (AC_SDIN1) resume interrupt */
#define   ICH_PRI		0x00000400	/* primary (AC_SDIN0) resume interrupt */
#define   ICH_SCR		0x00000200	/* secondary (AC_SDIN1) codec ready */
#define   ICH_PCR		0x00000100	/* primary (AC_SDIN0) codec ready */
#define   ICH_MCINT		0x00000080	/* MIC capture interrupt */
#define   ICH_POINT		0x00000040	/* playback interrupt */
#define   ICH_PIINT		0x00000020	/* capture interrupt */
#define   ICH_NVSPINT		0x00000010	/* nforce spdif interrupt */
#define   ICH_MOINT		0x00000004	/* modem playback interrupt */
#define   ICH_MIINT		0x00000002	/* modem capture interrupt */
#define   ICH_GSCI		0x00000001	/* GPI status change interrupt */
#define ICH_REG_ACC_SEMA		0x44	/* byte - codec write semaphore */
#define   ICH_CAS		0x01		/* codec access semaphore */

#define ICH_MAX_FRAGS		32		/* max hw frags */


/*
 *  
 */

enum { ICHD_MDMIN, ICHD_MDMOUT, ICHD_MDMLAST = ICHD_MDMOUT };
enum { ALID_MDMIN, ALID_MDMOUT, ALID_MDMLAST = ALID_MDMOUT };

#define get_ichdev(substream) (substream->runtime->private_data)

struct ichdev {
	unsigned int ichd;			/* ich device number */
	unsigned long reg_offset;		/* offset to bmaddr */
	u32 *bdbar;				/* CPU address (32bit) */
	unsigned int bdbar_addr;		/* PCI bus address (32bit) */
	struct snd_pcm_substream *substream;
	unsigned int physbuf;			/* physical address (32bit) */
        unsigned int size;
        unsigned int fragsize;
        unsigned int fragsize1;
        unsigned int position;
        int frags;
        int lvi;
        int lvi_frag;
	int civ;
	int ack;
	int ack_reload;
	unsigned int ack_bit;
	unsigned int roff_sr;
	unsigned int roff_picb;
	unsigned int int_sta_mask;		/* interrupt status mask */
	unsigned int ali_slot;			/* ALI DMA slot */
	struct snd_ac97 *ac97;
};

struct intel8x0m {
	unsigned int device_type;

	int irq;

	void __iomem *addr;
	void __iomem *bmaddr;

	struct pci_dev *pci;
	struct snd_card *card;

	int pcm_devs;
	struct snd_pcm *pcm[2];
	struct ichdev ichd[2];

	unsigned int in_ac97_init: 1;

	struct snd_ac97_bus *ac97_bus;
	struct snd_ac97 *ac97;

	spinlock_t reg_lock;
	
	struct snd_dma_buffer bdbars;
	u32 bdbars_count;
	u32 int_sta_reg;		/* interrupt status register */
	u32 int_sta_mask;		/* interrupt status mask */
	unsigned int pcm_pos_shift;
};

static struct pci_device_id snd_intel8x0m_ids[] = {
	{ PCI_VDEVICE(INTEL, 0x2416), DEVICE_INTEL },	/* 82801AA */
	{ PCI_VDEVICE(INTEL, 0x2426), DEVICE_INTEL },	/* 82901AB */
	{ PCI_VDEVICE(INTEL, 0x2446), DEVICE_INTEL },	/* 82801BA */
	{ PCI_VDEVICE(INTEL, 0x2486), DEVICE_INTEL },	/* ICH3 */
	{ PCI_VDEVICE(INTEL, 0x24c6), DEVICE_INTEL }, /* ICH4 */
	{ PCI_VDEVICE(INTEL, 0x24d6), DEVICE_INTEL }, /* ICH5 */
	{ PCI_VDEVICE(INTEL, 0x266d), DEVICE_INTEL },	/* ICH6 */
	{ PCI_VDEVICE(INTEL, 0x27dd), DEVICE_INTEL },	/* ICH7 */
	{ PCI_VDEVICE(INTEL, 0x7196), DEVICE_INTEL },	/* 440MX */
	{ PCI_VDEVICE(AMD, 0x7446), DEVICE_INTEL },	/* AMD768 */
	{ PCI_VDEVICE(SI, 0x7013), DEVICE_SIS },	/* SI7013 */
	{ PCI_VDEVICE(NVIDIA, 0x01c1), DEVICE_NFORCE }, /* NFORCE */
	{ PCI_VDEVICE(NVIDIA, 0x0069), DEVICE_NFORCE }, /* NFORCE2 */
	{ PCI_VDEVICE(NVIDIA, 0x0089), DEVICE_NFORCE }, /* NFORCE2s */
	{ PCI_VDEVICE(NVIDIA, 0x00d9), DEVICE_NFORCE }, /* NFORCE3 */
#if 0
	{ PCI_VDEVICE(AMD, 0x746d), DEVICE_INTEL },	/* AMD8111 */
	{ PCI_VDEVICE(AL, 0x5455), DEVICE_ALI },   /* Ali5455 */
#endif
	{ 0, }
};

MODULE_DEVICE_TABLE(pci, snd_intel8x0m_ids);

/*
 *  Lowlevel I/O - busmaster
 */