/*
 *   ALSA driver for Intel ICH (i8x0) chipsets
 *
 *      Copyright (c) 2000 Jaroslav Kysela <perex@perex.cz>
 *
 *
 *   This code also contains alpha support for SiS 735 chipsets provided
 *   by Mike Pieper <mptei@users.sourceforge.net>. We have no datasheet
 *   for SiS735, so the code is not fully functional.
 *
 *
 *   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 <linux/io.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/ac97_codec.h>
#include <sound/info.h>
#include <sound/initval.h>
/* for 440MX workaround */
#include <asm/pgtable.h>
#include <asm/cacheflush.h>

#ifdef CONFIG_KVM_GUEST
#include <linux/kvm_para.h>
#else
#define kvm_para_available() (0)
#endif

MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
MODULE_DESCRIPTION("Intel 82801AA,82901AB,i810,i820,i830,i840,i845,MX440; SiS 7012; Ali 5455");
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,6300ESB},"
                "{Intel,ESB2},"
                "{Intel,MX440},"
                "{SiS,SI7012},"
                "{NVidia,nForce Audio},"
                "{NVidia,nForce2 Audio},"
                "{NVidia,nForce3 Audio},"
                "{NVidia,MCP04},"
                "{NVidia,MCP501},"
                "{NVidia,CK804},"
                "{NVidia,CK8},"
                "{NVidia,CK8S},"
                "{AMD,AMD768},"
                "{AMD,AMD8111},"
                "{ALI,M5455}}");

static int index = SNDRV_DEFAULT_IDX1;  /* Index 0-MAX */
static char *id = SNDRV_DEFAULT_STR1;   /* ID for this card */
static int ac97_clock;
static char *ac97_quirk;
static bool buggy_semaphore;
static int buggy_irq = -1; /* auto-check */
static bool xbox;
static int spdif_aclink = -1;
static int inside_vm = -1;

module_param(index, int, 0444);
MODULE_PARM_DESC(index, "Index value for Intel i8x0 soundcard.");
module_param(id, charp, 0444);
MODULE_PARM_DESC(id, "ID string for Intel i8x0 soundcard.");
module_param(ac97_clock, int, 0444);
MODULE_PARM_DESC(ac97_clock, "AC'97 codec clock (0 = whitelist + auto-detect, 1 = force autodetect).");
module_param(ac97_quirk, charp, 0444);
MODULE_PARM_DESC(ac97_quirk, "AC'97 workaround for strange hardware.");
module_param(buggy_semaphore, bool, 0444);
MODULE_PARM_DESC(buggy_semaphore, "Enable workaround for hardwares with problematic codec semaphores.");
module_param(buggy_irq, bint, 0444);
MODULE_PARM_DESC(buggy_irq, "Enable workaround for buggy interrupts on some motherboards.");
module_param(xbox, bool, 0444);
MODULE_PARM_DESC(xbox, "Set to 1 for Xbox, if you have problems with the AC'97 codec detection.");
module_param(spdif_aclink, int, 0444);
MODULE_PARM_DESC(spdif_aclink, "S/PDIF over AC-link.");
module_param(inside_vm, bint, 0444);
MODULE_PARM_DESC(inside_vm, "KVM/Parallels optimization.");

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

/*
 *  Direct registers
 */
enum { DEVICE_INTEL, DEVICE_INTEL_ICH4, 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 */
DEFINE_REGSET(PI, 0x00);        /* PCM in */
DEFINE_REGSET(PO, 0x10);        /* PCM out */
DEFINE_REGSET(MC, 0x20);        /* Mic in */

/* ICH4 busmaster blocks */
DEFINE_REGSET(MC2, 0x40);       /* Mic in 2 */
DEFINE_REGSET(PI2, 0x50);       /* PCM in 2 */
DEFINE_REGSET(SP, 0x60);        /* SPDIF out */

/* 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                0x2c    /* dword - global control */
#define   ICH_PCM_SPDIF_MASK    0xc0000000      /* s/pdif pcm slot mask (ICH4) */
#define   ICH_PCM_SPDIF_NONE    0x00000000      /* reserved - undefined */
#define   ICH_PCM_SPDIF_78      0x40000000      /* s/pdif pcm on slots 7&8 */
#define   ICH_PCM_SPDIF_69      0x80000000      /* s/pdif pcm on slots 6&9 */
#define   ICH_PCM_SPDIF_1011    0xc0000000      /* s/pdif pcm on slots 10&11 */
#define   ICH_PCM_20BIT         0x00400000      /* 20-bit samples (ICH4) */
#define   ICH_PCM_246_MASK      0x00300000      /* chan mask (not all chips) */
#define   ICH_PCM_8             0x00300000      /* 8 channels (not all chips) */
#define   ICH_PCM_6             0x00200000      /* 6 channels (not all chips) */
#define   ICH_PCM_4             0x00100000      /* 4 channels (not all chips) */
#define   ICH_PCM_2             0x00000000      /* 2 channels (stereo) */
#define   ICH_SIS_PCM_246_MASK  0x000000c0      /* 6 channels (SIS7012) */
#define   ICH_SIS_PCM_6         0x00000080      /* 6 channels (SIS7012) */
#define   ICH_SIS_PCM_4         0x00000040      /* 4 channels (SIS7012) */
#define   ICH_SIS_PCM_2         0x00000000      /* 2 channels (SIS7012) */
#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                0x30    /* 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_SAMPLE_16_20      0x00400000      /* ICH4: 16- and 20-bit samples */
#define   ICH_MULTICHAN_CAP     0x00300000      /* ICH4: multi-channel capability bits (RO) */
#define   ICH_SIS_TRI           0x00080000      /* SIS: tertiary resume irq */
#define   ICH_SIS_TCR           0x00040000      /* SIS: tertiary codec ready */
#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                0x34    /* byte - codec write semaphore */
#define   ICH_CAS               0x01            /* codec access semaphore */
#define ICH_REG_SDM             0x80
#define   ICH_DI2L_MASK         0x000000c0      /* PCM In 2, Mic In 2 data in line */
#define   ICH_DI2L_SHIFT        6
#define   ICH_DI1L_MASK         0x00000030      /* PCM In 1, Mic In 1 data in line */
#define   ICH_DI1L_SHIFT        4
#define   ICH_SE                0x00000008      /* steer enable */
#define   ICH_LDI_MASK          0x00000003      /* last codec read data input */

#define ICH_MAX_FRAGS           32              /* max hw frags */


/*
 * registers for Ali5455
 */

/* ALi 5455 busmaster blocks */
DEFINE_REGSET(AL_PI, 0x40);     /* ALi PCM in */
DEFINE_REGSET(AL_PO, 0x50);     /* Ali PCM out */
DEFINE_REGSET(AL_MC, 0x60);     /* Ali Mic in */
DEFINE_REGSET(AL_CDC_SPO, 0x70);        /* Ali Codec SPDIF out */
DEFINE_REGSET(AL_CENTER, 0x80);         /* Ali center out */
DEFINE_REGSET(AL_LFE, 0x90);            /* Ali center out */
DEFINE_REGSET(AL_CLR_SPI, 0xa0);        /* Ali Controller SPDIF in */
DEFINE_REGSET(AL_CLR_SPO, 0xb0);        /* Ali Controller SPDIF out */
DEFINE_REGSET(AL_I2S, 0xc0);    /* Ali I2S in */
DEFINE_REGSET(AL_PI2, 0xd0);    /* Ali PCM2 in */
DEFINE_REGSET(AL_MC2, 0xe0);    /* Ali Mic2 in */

enum {
        ICH_REG_ALI_SCR = 0x00,         /* System Control Register */
        ICH_REG_ALI_SSR = 0x04,         /* System Status Register  */
        ICH_REG_ALI_DMACR = 0x08,       /* DMA Control Register    */
        ICH_REG_ALI_FIFOCR1 = 0x0c,     /* FIFO Control Register 1  */
        ICH_REG_ALI_INTERFACECR = 0x10, /* Interface Control Register */
        ICH_REG_ALI_INTERRUPTCR = 0x14, /* Interrupt control Register */
        ICH_REG_ALI_INTERRUPTSR = 0x18, /* Interrupt  Status Register */
        ICH_REG_ALI_FIFOCR2 = 0x1c,     /* FIFO Control Register 2   */
        ICH_REG_ALI_CPR = 0x20,         /* Command Port Register     */
        ICH_REG_ALI_CPR_ADDR = 0x22,    /* ac97 addr write */
        ICH_REG_ALI_SPR = 0x24,         /* Status Port Register      */
        ICH_REG_ALI_SPR_ADDR = 0x26,    /* ac97 addr read */
        ICH_REG_ALI_FIFOCR3 = 0x2c,     /* FIFO Control Register 3  */
        ICH_REG_ALI_TTSR = 0x30,        /* Transmit Tag Slot Register */
        ICH_REG_ALI_RTSR = 0x34,        /* Receive Tag Slot  Register */
        ICH_REG_ALI_CSPSR = 0x38,       /* Command/Status Port Status Register */
        ICH_REG_ALI_CAS = 0x3c,         /* Codec Write Semaphore Register */
        ICH_REG_ALI_HWVOL = 0xf0,       /* hardware volume control/status */
        ICH_REG_ALI_I2SCR = 0xf4,       /* I2S control/status */
        ICH_REG_ALI_SPDIFCSR = 0xf8,    /* spdif channel status register  */
        ICH_REG_ALI_SPDIFICS = 0xfc,    /* spdif interface control/status  */
};

#define ALI_CAS_SEM_BUSY        0x80000000
#define ALI_CPR_ADDR_SECONDARY  0x100
#define ALI_CPR_ADDR_READ       0x80
#define ALI_CSPSR_CODEC_READY   0x08
#define ALI_CSPSR_READ_OK       0x02
#define ALI_CSPSR_WRITE_OK      0x01

/* interrupts for the whole chip by interrupt status register finish */
 
#define ALI_INT_MICIN2          (1<<26)
#define ALI_INT_PCMIN2          (1<<25)
#define ALI_INT_I2SIN           (1<<24)
#define ALI_INT_SPDIFOUT        (1<<23) /* controller spdif out INTERRUPT */
#define ALI_INT_SPDIFIN         (1<<22)
#define ALI_INT_LFEOUT          (1<<21)
#define ALI_INT_CENTEROUT       (1<<20)
#define ALI_INT_CODECSPDIFOUT   (1<<19)
#define ALI_INT_MICIN           (1<<18)
#define ALI_INT_PCMOUT          (1<<17)
#define ALI_INT_PCMIN           (1<<16)
#define ALI_INT_CPRAIS          (1<<7)  /* command port available */
#define ALI_INT_SPRAIS          (1<<5)  /* status port available */
#define ALI_INT_GPIO            (1<<1)
#define ALI_INT_MASK            (ALI_INT_SPDIFOUT|ALI_INT_CODECSPDIFOUT|\
                                 ALI_INT_MICIN|ALI_INT_PCMOUT|ALI_INT_PCMIN)

#define ICH_ALI_SC_RESET        (1<<31) /* master reset */
#define ICH_ALI_SC_AC97_DBL     (1<<30)
#define ICH_ALI_SC_CODEC_SPDF   (3<<20) /* 1=7/8, 2=6/9, 3=10/11 */
#define ICH_ALI_SC_IN_BITS      (3<<18)
#define ICH_ALI_SC_OUT_BITS     (3<<16)
#define ICH_ALI_SC_6CH_CFG      (3<<14)
#define ICH_ALI_SC_PCM_4        (1<<8)
#define ICH_ALI_SC_PCM_6        (2<<8)
#define ICH_ALI_SC_PCM_246_MASK (3<<8)

#define ICH_ALI_SS_SEC_ID       (3<<5)
#define ICH_ALI_SS_PRI_ID       (3<<3)

#define ICH_ALI_IF_AC97SP       (1<<21)
#define ICH_ALI_IF_MC           (1<<20)
#define ICH_ALI_IF_PI           (1<<19)
#define ICH_ALI_IF_MC2          (1<<18)
#define ICH_ALI_IF_PI2          (1<<17)
#define ICH_ALI_IF_LINE_SRC     (1<<15) /* 0/1 = slot 3/6 */
#define ICH_ALI_IF_MIC_SRC      (1<<14) /* 0/1 = slot 3/6 */
#define ICH_ALI_IF_SPDF_SRC     (3<<12) /* 00 = PCM, 01 = AC97-in, 10 = spdif-in, 11 = i2s */
#define ICH_ALI_IF_AC97_OUT     (3<<8)  /* 00 = PCM, 10 = spdif-in, 11 = i2s */
#define ICH_ALI_IF_PO_SPDF      (1<<3)
#define ICH_ALI_IF_PO           (1<<1)

/*
 *  
 */

enum {
        ICHD_PCMIN,
        ICHD_PCMOUT,
        ICHD_MIC,
        ICHD_MIC2,
        ICHD_PCM2IN,
        ICHD_SPBAR,
        ICHD_LAST = ICHD_SPBAR
};
enum {
        NVD_PCMIN,
        NVD_PCMOUT,
        NVD_MIC,
        NVD_SPBAR,
        NVD_LAST = NVD_SPBAR
};
enum {
        ALID_PCMIN,
        ALID_PCMOUT,
        ALID_MIC,
        ALID_AC97SPDIFOUT,
        ALID_SPDIFIN,
        ALID_SPDIFOUT,
        ALID_LAST = ALID_SPDIFOUT
};

#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;
        unsigned int pos_shift;
        unsigned int last_pos;
        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 ac97_pcm *pcm;
        int pcm_open_flag;
        unsigned int page_attr_changed: 1;
        unsigned int suspended: 1;
};

struct intel8x0 {
        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[6];
        struct ichdev ichd[6];

        unsigned multi4: 1,
                 multi6: 1,
                 multi8 :1,
                 dra: 1,
                 smp20bit: 1;
        unsigned in_ac97_init: 1,
                 in_sdin_init: 1;
        unsigned in_measurement: 1;     /* during ac97 clock measurement */
        unsigned fix_nocache: 1;        /* workaround for 440MX */
        unsigned buggy_irq: 1;          /* workaround for buggy mobos */
        unsigned xbox: 1;               /* workaround for Xbox AC'97 detection */
        unsigned buggy_semaphore: 1;    /* workaround for buggy codec semaphore */
        unsigned inside_vm: 1;          /* enable VM optimization */

        int spdif_idx;  /* SPDIF BAR index; *_SPBAR or -1 if use PCMOUT */
        unsigned int sdm_saved; /* SDM reg value */

        struct snd_ac97_bus *ac97_bus;
        struct snd_ac97 *ac97[3];
        unsigned int ac97_sdin[3];
        unsigned int max_codecs, ncodecs;
        unsigned int *codec_bit;
        unsigned int codec_isr_bits;
        unsigned int codec_ready_bits;

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

static const struct pci_device_id snd_intel8x0_ids[] = {
        { PCI_VDEVICE(INTEL, 0x2415), DEVICE_INTEL },   /* 82801AA */
        { PCI_VDEVICE(INTEL, 0x2425), DEVICE_INTEL },   /* 82901AB */
        { PCI_VDEVICE(INTEL, 0x2445), DEVICE_INTEL },   /* 82801BA */
        { PCI_VDEVICE(INTEL, 0x2485), DEVICE_INTEL },   /* ICH3 */
        { PCI_VDEVICE(INTEL, 0x24c5), DEVICE_INTEL_ICH4 }, /* ICH4 */
        { PCI_VDEVICE(INTEL, 0x24d5), DEVICE_INTEL_ICH4 }, /* ICH5 */
        { PCI_VDEVICE(INTEL, 0x25a6), DEVICE_INTEL_ICH4 }, /* ESB */
        { PCI_VDEVICE(INTEL, 0x266e), DEVICE_INTEL_ICH4 }, /* ICH6 */
        { PCI_VDEVICE(INTEL, 0x27de), DEVICE_INTEL_ICH4 }, /* ICH7 */
        { PCI_VDEVICE(INTEL, 0x2698), DEVICE_INTEL_ICH4 }, /* ESB2 */
        { PCI_VDEVICE(INTEL, 0x7195), DEVICE_INTEL },   /* 440MX */
        { PCI_VDEVICE(SI, 0x7012), DEVICE_SIS },        /* SI7012 */
        { PCI_VDEVICE(NVIDIA, 0x01b1), DEVICE_NFORCE }, /* NFORCE */
        { PCI_VDEVICE(NVIDIA, 0x003a), DEVICE_NFORCE }, /* MCP04 */
        { PCI_VDEVICE(NVIDIA, 0x006a), DEVICE_NFORCE }, /* NFORCE2 */
        { PCI_VDEVICE(NVIDIA, 0x0059), DEVICE_NFORCE }, /* CK804 */
        { PCI_VDEVICE(NVIDIA, 0x008a), DEVICE_NFORCE }, /* CK8 */
        { PCI_VDEVICE(NVIDIA, 0x00da), DEVICE_NFORCE }, /* NFORCE3 */
        { PCI_VDEVICE(NVIDIA, 0x00ea), DEVICE_NFORCE }, /* CK8S */
        { PCI_VDEVICE(NVIDIA, 0x026b), DEVICE_NFORCE }, /* MCP51 */
        { PCI_VDEVICE(AMD, 0x746d), DEVICE_INTEL },     /* AMD8111 */
        { PCI_VDEVICE(AMD, 0x7445), DEVICE_INTEL },     /* AMD768 */
        { PCI_VDEVICE(AL, 0x5455), DEVICE_ALI },   /* Ali5455 */
        { 0, }
};

MODULE_DEVICE_TABLE(pci, snd_intel8x0_ids);

/*
 *  Lowlevel I/O - busmaster
 */

static inline u8 igetbyte(struct intel8x0 *chip, u32 offset)
{
        return ioread8(chip->bmaddr + offset);
}

static inline u16 igetword(struct intel8x0 *chip, u32 offset)
{
        return ioread16(chip->bmaddr + offset);
}

static inline u32 igetdword(struct intel8x0 *chip, u32 offset)
{
        return ioread32(chip->bmaddr + offset);
}

static inline void iputbyte(struct intel8x0 *chip, u32 offset, u8 val)
{
        iowrite8(val, chip->bmaddr + offset);
}

static inline void iputword(struct intel8x0 *chip, u32 offset, u16 val)
{
        iowrite16(val, chip->bmaddr + offset);
}

static inline void iputdword(struct intel8x0 *chip, u32 offset, u32 val)
{
        iowrite32(val, chip->bmaddr + offset);
}

/*
 *  Lowlevel I/O - AC'97 registers
 */

static inline u16 iagetword(struct intel8x0 *chip, u32 offset)
{
        return ioread16(chip->addr + offset);
}

static inline void iaputword(struct intel8x0 *chip, u32 offset, u16 val)
{
        iowrite16(val, chip->addr + offset);
}

/*
 *  Basic I/O
 */

/*
 * access to AC97 codec via normal i/o (for ICH and SIS7012)
 */

static int snd_intel8x0_codec_semaphore(struct intel8x0 *chip, unsigned int codec)
{
        int time;
        
        if (codec > 2)
                return -EIO;
        if (chip->in_sdin_init) {
                /* we don't know the ready bit assignment at the moment */
                /* so we check any */
                codec = chip->codec_isr_bits;
        } else {
                codec = chip->codec_bit[chip->ac97_sdin[codec]];
        }

        /* codec ready ? */
        if ((igetdword(chip, ICHREG(GLOB_STA)) & codec) == 0)
                return -EIO;

        if (chip->buggy_semaphore)
                return 0; /* just ignore ... */

        /* Anyone holding a semaphore for 1 msec should be shot... */
        time = 100;
        do {
                if (!(igetbyte(chip, ICHREG(ACC_SEMA)) & ICH_CAS))
                        return 0;
                udelay(10);
        } while (time--);

        /* access to some forbidden (non existent) ac97 registers will not
         * reset the semaphore. So even if you don't get the semaphore, still
         * continue the access. We don't need the semaphore anyway. */
        dev_err(chip->card->dev,
                "codec_semaphore: semaphore is not ready [0x%x][0x%x]\n",
                        igetbyte(chip, ICHREG(ACC_SEMA)), igetdword(chip, ICHREG(GLOB_STA)));
        iagetword(chip, 0);     /* clear semaphore flag */
        /* I don't care about the semaphore */
        return -EBUSY;
}
 
static void snd_intel8x0_codec_write(struct snd_ac97 *ac97,
                                     unsigned short reg,
                                     unsigned short val)
{
        struct intel8x0 *chip = ac97->private_data;
        
        if (snd_intel8x0_codec_semaphore(chip, ac97->num) < 0) {
                if (! chip->in_ac97_init)
                        dev_err(chip->card->dev,
                                "codec_write %d: semaphore is not ready for register 0x%x\n",
                                ac97->num, reg);
        }
        iaputword(chip, reg + ac97->num * 0x80, val);
}

static unsigned short snd_intel8x0_codec_read(struct snd_ac97 *ac97,
                                              unsigned short reg)
{
        struct intel8x0 *chip = ac97->private_data;
        unsigned short res;
        unsigned int tmp;

        if (snd_intel8x0_codec_semaphore(chip, ac97->num) < 0) {
                if (! chip->in_ac97_init)
                        dev_err(chip->card->dev,
                                "codec_read %d: semaphore is not ready for register 0x%x\n",
                                ac97->num, reg);
                res = 0xffff;
        } else {
                res = iagetword(chip, reg + ac97->num * 0x80);
                if ((tmp = igetdword(chip, ICHREG(GLOB_STA))) & ICH_RCS) {
                        /* reset RCS and preserve other R/WC bits */
                        iputdword(chip, ICHREG(GLOB_STA), tmp &
                                  ~(chip->codec_ready_bits | ICH_GSCI));
                        if (! chip->in_ac97_init)
                                dev_err(chip->card->dev,
                                        "codec_read %d: read timeout for register 0x%x\n",
                                        ac97->num, reg);
                        res = 0xffff;
                }
        }
        return res;
}

static void snd_intel8x0_codec_read_test(struct intel8x0 *chip,
                                         unsigned int codec)
{
        unsigned int tmp;

        if (snd_intel8x0_codec_semaphore(chip, codec) >= 0) {
                iagetword(chip, codec * 0x80);
                if ((tmp = igetdword(chip, ICHREG(GLOB_STA))) & ICH_RCS) {
                        /* reset RCS and preserve other R/WC bits */
                        iputdword(chip, ICHREG(GLOB_STA), tmp &
                                  ~(chip->codec_ready_bits | ICH_GSCI));
                }
        }
}

/*
 * access to AC97 for Ali5455
 */
static int snd_intel8x0_ali_codec_ready(struct intel8x0 *chip, int mask)
{
        int count = 0;
        for (count = 0; count < 0x7f; count++) {
                int val = igetbyte(chip, ICHREG(ALI_CSPSR));
                if (val & mask)
                        return 0;
        }
        if (! chip->in_ac97_init)
                dev_warn(chip->card->dev, "AC97 codec ready timeout.\n");
        return -EBUSY;
}

static int snd_intel8x0_ali_codec_semaphore(struct intel8x0 *chip)
{
        int time = 100;
        if (chip->buggy_semaphore)
                return 0; /* just ignore ... */
        while (--time && (igetdword(chip, ICHREG(ALI_CAS)) & ALI_CAS_SEM_BUSY))
                udelay(1);
        if (! time && ! chip->in_ac97_init)
                dev_warn(chip->card->dev, "ali_codec_semaphore timeout\n");
        return snd_intel8x0_ali_codec_ready(chip, ALI_CSPSR_CODEC_READY);
}

static unsigned short snd_intel8x0_ali_codec_read(struct snd_ac97 *ac97, unsigned short reg)
{
        struct intel8x0 *chip = ac97->private_data;
        unsigned short data = 0xffff;

        if (snd_intel8x0_ali_codec_semaphore(chip))
                goto __err;
        reg |= ALI_CPR_ADDR_READ;
        if (ac97->num)
                reg |= ALI_CPR_ADDR_SECONDARY;
        iputword(chip, ICHREG(ALI_CPR_ADDR), reg);
        if (snd_intel8x0_ali_codec_ready(chip, ALI_CSPSR_READ_OK))
                goto __err;
        data = igetword(chip, ICHREG(ALI_SPR));
 __err:
        return data;
}

static void snd_intel8x0_ali_codec_write(struct snd_ac97 *ac97, unsigned short reg,
                                         unsigned short val)
{
        struct intel8x0 *chip = ac97->private_data;

        if (snd_intel8x0_ali_codec_semaphore(chip))
                return;
        iputword(chip, ICHREG(ALI_CPR), val);
        if (ac97->num)
                reg |= ALI_CPR_ADDR_SECONDARY;
        iputword(chip, ICHREG(ALI_CPR_ADDR), reg);
        snd_intel8x0_ali_codec_ready(chip, ALI_CSPSR_WRITE_OK);
}


/*
 * DMA I/O
 */
static void snd_intel8x0_setup_periods(struct intel8x0 *chip, struct ichdev *ichdev) 
{
        int idx;
        u32 *bdbar = ichdev->bdbar;
        unsigned long port = ichdev->reg_offset;

        iputdword(chip, port + ICH_REG_OFF_BDBAR, ichdev->bdbar_addr);
        if (ichdev->size == ichdev->fragsize) {
                ichdev->ack_reload = ichdev->ack = 2;
                ichdev->fragsize1 = ichdev->fragsize >> 1;
                for (idx = 0; idx < (ICH_REG_LVI_MASK + 1) * 2; idx += 4) {
                        bdbar[idx + 0] = cpu_to_le32(ichdev->physbuf);
                        bdbar[idx + 1] = cpu_to_le32(0x80000000 | /* interrupt on completion */
                                                     ichdev->fragsize1 >> ichdev->pos_shift);
                        bdbar[idx + 2] = cpu_to_le32(ichdev->physbuf + (ichdev->size >> 1));
                        bdbar[idx + 3] = cpu_to_le32(0x80000000 | /* interrupt on completion */
                                                     ichdev->fragsize1 >> ichdev->pos_shift);
                }
                ichdev->frags = 2;
        } else {
                ichdev->ack_reload = ichdev->ack = 1;
                ichdev->fragsize1 = ichdev->fragsize;
                for (idx = 0; idx < (ICH_REG_LVI_MASK + 1) * 2; idx += 2) {
                        bdbar[idx + 0] = cpu_to_le32(ichdev->physbuf +
                                                     (((idx >> 1) * ichdev->fragsize) %
                                                      ichdev->size));
                        bdbar[idx + 1] = cpu_to_le32(0x80000000 | /* interrupt on completion */
                                                     ichdev->fragsize >> ichdev->pos_shift);
#if 0
                        dev_dbg(chip->card->dev, "bdbar[%i] = 0x%x [0x%x]\n",
                               idx + 0, bdbar[idx + 0], bdbar[idx + 1]);
#endif
                }
                ichdev->frags = ichdev->size / ichdev->fragsize;
        }
        iputbyte(chip, port + ICH_REG_OFF_LVI, ichdev->lvi = ICH_REG_LVI_MASK);
        ichdev->civ = 0;
        iputbyte(chip, port + ICH_REG_OFF_CIV, 0);
        ichdev->lvi_frag = ICH_REG_LVI_MASK % ichdev->frags;
        ichdev->position = 0;
#if 0
        dev_dbg(chip->card->dev,
                "lvi_frag = %i, frags = %i, period_size = 0x%x, period_size1 = 0x%x\n",
               ichdev->lvi_frag, ichdev->frags, ichdev->fragsize,
               ichdev->fragsize1);
#endif
        /* clear interrupts */
        iputbyte(chip, port + ichdev->roff_sr, ICH_FIFOE | ICH_BCIS | ICH_LVBCI);
}

#ifdef __i386__
/*
 * Intel 82443MX running a 100MHz processor system bus has a hardware bug,
 * which aborts PCI busmaster for audio transfer.  A workaround is to set
 * the pages as non-cached.  For details, see the errata in
 *      http://download.intel.com/design/chipsets/specupdt/24505108.pdf
 */
static void fill_nocache(void *buf, int size, int nocache)
{
        size = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
        if (nocache)
                set_pages_uc(virt_to_page(buf), size);
        else
                set_pages_wb(virt_to_page(buf), size);
}
#else
#define fill_nocache(buf, size, nocache) do { ; } while (0)
#endif

/*
 *  Interrupt handler
 */

static inline void snd_intel8x0_update(struct intel8x0 *chip, struct ichdev *ichdev)
{
        unsigned long port = ichdev->reg_offset;
        unsigned long flags;
        int status, civ, i, step;
        int ack = 0;

        spin_lock_irqsave(&chip->reg_lock, flags);
        status = igetbyte(chip, port + ichdev->roff_sr);
        civ = igetbyte(chip, port + ICH_REG_OFF_CIV);
        if (!(status & ICH_BCIS)) {
                step = 0;
        } else if (civ == ichdev->civ) {
                // snd_printd("civ same %d\n", civ);
                step = 1;
                ichdev->civ++;
                ichdev->civ &= ICH_REG_LVI_MASK;
        } else {
                step = civ - ichdev->civ;
                if (step < 0)
                        step += ICH_REG_LVI_MASK + 1;
                // if (step != 1)
                //      snd_printd("step = %d, %d -> %d\n", step, ichdev->civ, civ);
                ichdev->civ = civ;
        }

        ichdev->position += step * ichdev->fragsize1;
        if (! chip->in_measurement)
                ichdev->position %= ichdev->size;
        ichdev->lvi += step;
        ichdev->lvi &= ICH_REG_LVI_MASK;
        iputbyte(chip, port + ICH_REG_OFF_LVI, ichdev->lvi);
        for (i = 0; i < step; i++) {
                ichdev->lvi_frag++;
                ichdev->lvi_frag %= ichdev->frags;
                ichdev->bdbar[ichdev->lvi * 2] = cpu_to_le32(ichdev->physbuf + ichdev->lvi_frag * ichdev->fragsize1);
#if 0
        dev_dbg(chip->card->dev,
                "new: bdbar[%i] = 0x%x [0x%x], prefetch = %i, all = 0x%x, 0x%x\n",
               ichdev->lvi * 2, ichdev->bdbar[ichdev->lvi * 2],
               ichdev->bdbar[ichdev->lvi * 2 + 1], inb(ICH_REG_OFF_PIV + port),
               inl(port + 4), inb(port + ICH_REG_OFF_CR));
#endif
                if (--ichdev->ack == 0) {
                        ichdev->ack = ichdev->ack_reload;
                        ack = 1;
                }
        }
        spin_unlock_irqrestore(&chip->reg_lock, flags);
        if (ack && ichdev->substream) {
                snd_pcm_period_elapsed(ichdev->substream);
        }
        iputbyte(chip, port + ichdev->roff_sr,
                 status & (ICH_FIFOE | ICH_BCIS | ICH_LVBCI));
}

static irqreturn_t snd_intel8x0_interrupt(int irq, void *dev_id)
{
        struct intel8x0 *chip = dev_id;
        struct ichdev *ichdev;
        unsigned int status;
        unsigned int i;

        status = igetdword(chip, chip->int_sta_reg);
        if (status == 0xffffffff)       /* we are not yet resumed */
                return IRQ_NONE;

        if ((status & chip->int_sta_mask) == 0) {
                if (status) {
                        /* ack */
                        iputdword(chip, chip->int_sta_reg, status);
                        if (! chip->buggy_irq)
                                status = 0;
                }
                return IRQ_RETVAL(status);
        }

        for (i = 0; i < chip->bdbars_count; i++) {
                ichdev = &chip->ichd[i];
                if (status & ichdev->int_sta_mask)
                        snd_intel8x0_update(chip, ichdev);
        }

        /* ack them */
        iputdword(chip, chip->int_sta_reg, status & chip->int_sta_mask);
        
        return IRQ_HANDLED;
}

/*
 *  PCM part
 */

static int snd_intel8x0_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
        struct intel8x0 *chip = snd_pcm_substream_chip(substream);
        struct ichdev *ichdev = get_ichdev(substream);
        unsigned char val = 0;
        unsigned long port = ichdev->reg_offset;

        switch (cmd) {
        case SNDRV_PCM_TRIGGER_RESUME:
                ichdev->suspended = 0;
                /* fallthru */
        case SNDRV_PCM_TRIGGER_START:
        case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
                val = ICH_IOCE | ICH_STARTBM;
                ichdev->last_pos = ichdev->position;
                break;
        case SNDRV_PCM_TRIGGER_SUSPEND:
                ichdev->suspended = 1;
                /* fallthru */
        case SNDRV_PCM_TRIGGER_STOP:
                val = 0;
                break;
        case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
                val = ICH_IOCE;
                break;
        default:
                return -EINVAL;
        }
        iputbyte(chip, port + ICH_REG_OFF_CR, val);
        if (cmd == SNDRV_PCM_TRIGGER_STOP) {
                /* wait until DMA stopped */
                while (!(igetbyte(chip, port + ichdev->roff_sr) & ICH_DCH)) ;
                /* reset whole DMA things */
                iputbyte(chip, port + ICH_REG_OFF_CR, ICH_RESETREGS);
        }
        return 0;
}

static int snd_intel8x0_ali_trigger(struct snd_pcm_substream *substream, int cmd)
{
        struct intel8x0 *chip = snd_pcm_substream_chip(substream);
        struct ichdev *ichdev = get_ichdev(substream);
        unsigned long port = ichdev->reg_offset;
        static int fiforeg[] = {
                ICHREG(ALI_FIFOCR1), ICHREG(ALI_FIFOCR2), ICHREG(ALI_FIFOCR3)
        };
        unsigned int val, fifo;

        val = igetdword(chip, ICHREG(ALI_DMACR));
        switch (cmd) {
        case SNDRV_PCM_TRIGGER_RESUME:
                ichdev->suspended = 0;
                /* fallthru */
        case SNDRV_PCM_TRIGGER_START:
        case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
                if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
                        /* clear FIFO for synchronization of channels */
                        fifo = igetdword(chip, fiforeg[ichdev->ali_slot / 4]);
                        fifo &= ~(0xff << (ichdev->ali_slot % 4));  
                        fifo |= 0x83 << (ichdev->ali_slot % 4); 
                        iputdword(chip, fiforeg[ichdev->ali_slot / 4], fifo);
                }
                iputbyte(chip, port + ICH_REG_OFF_CR, ICH_IOCE);
                val &= ~(1 << (ichdev->ali_slot + 16)); /* clear PAUSE flag */
                /* start DMA */
                iputdword(chip, ICHREG(ALI_DMACR), val | (1 << ichdev->ali_slot));
                break;
        case SNDRV_PCM_TRIGGER_SUSPEND:
                ichdev->suspended = 1;
                /* fallthru */
        case SNDRV_PCM_TRIGGER_STOP:
        case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
                /* pause */
                iputdword(chip, ICHREG(ALI_DMACR), val | (1 << (ichdev->ali_slot + 16)));
                iputbyte(chip, port + ICH_REG_OFF_CR, 0);
                while (igetbyte(chip, port + ICH_REG_OFF_CR))
                        ;
                if (cmd == SNDRV_PCM_TRIGGER_PAUSE_PUSH)
                        break;
                /* reset whole DMA things */
                iputbyte(chip, port + ICH_REG_OFF_CR, ICH_RESETREGS);
                /* clear interrupts */
                iputbyte(chip, port + ICH_REG_OFF_SR,
                         igetbyte(chip, port + ICH_REG_OFF_SR) | 0x1e);
                iputdword(chip, ICHREG(ALI_INTERRUPTSR),
                          igetdword(chip, ICHREG(ALI_INTERRUPTSR)) & ichdev->int_sta_mask);
                break;
        default:
                return -EINVAL;
        }
        return 0;
}

static int snd_intel8x0_hw_params(struct snd_pcm_substream *substream,
                                  struct snd_pcm_hw_params *hw_params)
{
        struct intel8x0 *chip = snd_pcm_substream_chip(substream);
        struct ichdev *ichdev = get_ichdev(substream);
        struct snd_pcm_runtime *runtime = substream->runtime;
        int dbl = params_rate(hw_params) > 48000;
        int err;

        if (chip->fix_nocache && ichdev->page_attr_changed) {
                fill_nocache(runtime->dma_area, runtime->dma_bytes, 0); /* clear */
                ichdev->page_attr_changed = 0;
        }
        err = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
        if (err < 0)
                return err;
        if (chip->fix_nocache) {
                if (runtime->dma_area && ! ichdev->page_attr_changed) {
                        fill_nocache(runtime->dma_area, runtime->dma_bytes, 1);
                        ichdev->page_attr_changed = 1;
                }
        }
        if (ichdev->pcm_open_flag) {
                snd_ac97_pcm_close(ichdev->pcm);
                ichdev->pcm_open_flag = 0;
        }
        err = snd_ac97_pcm_open(ichdev->pcm, params_rate(hw_params),
                                params_channels(hw_params),
                                ichdev->pcm->r[dbl].slots);
        if (err >= 0) {
                ichdev->pcm_open_flag = 1;
                /* Force SPDIF setting */
                if (ichdev->ichd == ICHD_PCMOUT && chip->spdif_idx < 0)
                        snd_ac97_set_rate(ichdev->pcm->r[0].codec[0], AC97_SPDIF,
                                          params_rate(hw_params));
        }
        return err;
}

static int snd_intel8x0_hw_free(struct snd_pcm_substream *substream)
{
        struct intel8x0 *chip = snd_pcm_substream_chip(substream);
        struct ichdev *ichdev = get_ichdev(substream);

        if (ichdev->pcm_open_flag) {
                snd_ac97_pcm_close(ichdev->pcm);
                ichdev->pcm_open_flag = 0;
        }
        if (chip->fix_nocache && ichdev->page_attr_changed) {
                fill_nocache(substream->runtime->dma_area, substream->runtime->dma_bytes, 0);
                ichdev->page_attr_changed = 0;
        }
        return snd_pcm_lib_free_pages(substream);
}

static void snd_intel8x0_setup_pcm_out(struct intel8x0 *chip,
                                       struct snd_pcm_runtime *runtime)
{
        unsigned int cnt;
        int dbl = runtime->rate > 48000;

        spin_lock_irq(&chip->reg_lock);
        switch (chip->device_type) {
        case DEVICE_ALI:
                cnt = igetdword(chip, ICHREG(ALI_SCR));
                cnt &= ~ICH_ALI_SC_PCM_246_MASK;
                if (runtime->channels == 4 || dbl)
                        cnt |= ICH_ALI_SC_PCM_4;
                else if (runtime->channels == 6)
                        cnt |= ICH_ALI_SC_PCM_6;
                iputdword(chip, ICHREG(ALI_SCR), cnt);
                break;
        case DEVICE_SIS:
                cnt = igetdword(chip, ICHREG(GLOB_CNT));
                cnt &= ~ICH_SIS_PCM_246_MASK;
                if (runtime->channels == 4 || dbl)
                        cnt |= ICH_SIS_PCM_4;
                else if (runtime->channels == 6)
                        cnt |= ICH_SIS_PCM_6;
                iputdword(chip, ICHREG(GLOB_CNT), cnt);
                break;
        default:
                cnt = igetdword(chip, ICHREG(GLOB_CNT));
                cnt &= ~(ICH_PCM_246_MASK | ICH_PCM_20BIT);
                if (runtime->channels == 4 || dbl)
                        cnt |= ICH_PCM_4;
                else if (runtime->channels == 6)
                        cnt |= ICH_PCM_6;
                else if (runtime->channels == 8)
                        cnt |= ICH_PCM_8;
                if (chip->device_type == DEVICE_NFORCE) {
                        /* reset to 2ch once to keep the 6 channel data in alignment,
                         * to start from Front Left always
                         */
                        if (cnt & ICH_PCM_246_MASK) {
                                iputdword(chip, ICHREG(GLOB_CNT), cnt & ~ICH_PCM_246_MASK);
                                spin_unlock_irq(&chip->reg_lock);
                                msleep(50); /* grrr... */
                                spin_lock_irq(&chip->reg_lock);
                        }
                } else if (chip->device_type == DEVICE_INTEL_ICH4) {
                        if (runtime->sample_bits > 16)
                                cnt |= ICH_PCM_20BIT;
                }
                iputdword(chip, ICHREG(GLOB_CNT), cnt);
                break;
        }
        spin_unlock_irq(&chip->reg_lock);
}

static int snd_intel8x0_pcm_prepare(struct snd_pcm_substream *substream)
{
        struct intel8x0 *chip = snd_pcm_substream_chip(substream);
        struct snd_pcm_runtime *runtime = substream->runtime;
        struct ichdev *ichdev = get_ichdev(substream);

        ichdev->physbuf = runtime->dma_addr;
        ichdev->size = snd_pcm_lib_buffer_bytes(substream);
        ichdev->fragsize = snd_pcm_lib_period_bytes(substream);
        if (ichdev->ichd == ICHD_PCMOUT) {
                snd_intel8x0_setup_pcm_out(chip, runtime);
                if (chip->device_type == DEVICE_INTEL_ICH4)
                        ichdev->pos_shift = (runtime->sample_bits > 16) ? 2 : 1;
        }
        snd_intel8x0_setup_periods(chip, ichdev);
        return 0;
}

static snd_pcm_uframes_t snd_intel8x0_pcm_pointer(struct snd_pcm_substream *substream)
{
        struct intel8x0 *chip = snd_pcm_substream_chip(substream);
        struct ichdev *ichdev = get_ichdev(substream);
        size_t ptr1, ptr;
        int civ, timeout = 10;
        unsigned int position;

        spin_lock(&chip->reg_lock);
        do {
                civ = igetbyte(chip, ichdev->reg_offset + ICH_REG_OFF_CIV);
                ptr1 = igetword(chip, ichdev->reg_offset + ichdev->roff_picb);
                position = ichdev->position;
                if (ptr1 == 0) {
                        udelay(10);
                        continue;
                }
                if (civ != igetbyte(chip, ichdev->reg_offset + ICH_REG_OFF_CIV))
                        continue;

                /* IO read operation is very expensive inside virtual machine
                 * as it is emulated. The probability that subsequent PICB read
                 * will return different result is high enough to loop till
                 * timeout here.
                 * Same CIV is strict enough condition to be sure that PICB
                 * is valid inside VM on emulated card. */
                if (chip->inside_vm)
                        break;
                if (ptr1 == igetword(chip, ichdev->reg_offset + ichdev->roff_picb))
                        break;
        } while (timeout--);
        ptr = ichdev->last_pos;
        if (ptr1 != 0) {
                ptr1 <<= ichdev->pos_shift;
                ptr = ichdev->fragsize1 - ptr1;
                ptr += position;
                if (ptr < ichdev->last_pos) {
                        unsigned int pos_base, last_base;
                        pos_base = position / ichdev->fragsize1;
                        last_base = ichdev->last_pos / ichdev->fragsize1;
                        /* another sanity check; ptr1 can go back to full
                         * before the base position is updated
                         */
                        if (pos_base == last_base)
                                ptr = ichdev->last_pos;
                }
        }
        ichdev->last_pos = ptr;
        spin_unlock(&chip->reg_lock);
        if (ptr >= ichdev->size)
                return 0;
        return bytes_to_frames(substream->runtime, ptr);
}

static struct snd_pcm_hardware snd_intel8x0_stream =
{
        .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
                                 SNDRV_PCM_INFO_MMAP_VALID |
                                 SNDRV_PCM_INFO_PAUSE |
                                 SNDRV_PCM_INFO_RESUME),
        .formats =              SNDRV_PCM_FMTBIT_S16_LE,
        .rates =                SNDRV_PCM_RATE_48000,
        .rate_min =             48000,
        .rate_max =             48000,
        .channels_min =         2,
        .channels_max =         2,
        .buffer_bytes_max =     128 * 1024,
        .period_bytes_min =     32,
        .period_bytes_max =     128 * 1024,
        .periods_min =          1,
        .periods_max =          1024,
        .fifo_size =            0,
};

static unsigned int channels4[] = {
        2, 4,
};

static struct snd_pcm_hw_constraint_list hw_constraints_channels4 = {
        .count = ARRAY_SIZE(channels4),
        .list = channels4,
        .mask = 0,
};

static unsigned int channels6[] = {
        2, 4, 6,
};

static struct snd_pcm_hw_constraint_list hw_constraints_channels6 = {
        .count = ARRAY_SIZE(channels6),
        .list = channels6,
        .mask = 0,
};

static unsigned int channels8[] = {
        2, 4, 6, 8,
};

static struct snd_pcm_hw_constraint_list hw_constraints_channels8 = {
        .count = ARRAY_SIZE(channels8),
        .list = channels8,
        .mask = 0,
};

static int snd_intel8x0_pcm_open(struct snd_pcm_substream *substream, struct ichdev *ichdev)
{
        struct intel8x0 *chip = snd_pcm_substream_chip(substream);
        struct snd_pcm_runtime *runtime = substream->runtime;
        int err;

        ichdev->substream = substream;
        runtime->hw = snd_intel8x0_stream;
        runtime->hw.rates = ichdev->pcm->rates;
        snd_pcm_limit_hw_rates(runtime);
        if (chip->device_type == DEVICE_SIS) {
                runtime->hw.buffer_bytes_max = 64*1024;
                runtime->hw.period_bytes_max = 64*1024;
        }
        if ((err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS)) < 0)
                return err;
        runtime->private_data = ichdev;
        return 0;
}

static int snd_intel8x0_playback_open(struct snd_pcm_substream *substream)
{
        struct intel8x0 *chip = snd_pcm_substream_chip(substream);
        struct snd_pcm_runtime *runtime = substream->runtime;
        int err;

        err = snd_intel8x0_pcm_open(substream, &chip->ichd[ICHD_PCMOUT]);
        if (err < 0)
                return err;

        if (chip->multi8) {
                runtime->hw.channels_max = 8;
                snd_pcm_hw_constraint_list(runtime, 0,
                                                SNDRV_PCM_HW_PARAM_CHANNELS,
                                                &hw_constraints_channels8);
        } else if (chip->multi6) {
                runtime->hw.channels_max = 6;
                snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
                                           &hw_constraints_channels6);
        } else if (chip->multi4) {
                runtime->hw.channels_max = 4;
                snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
                                           &hw_constraints_channels4);
        }
        if (chip->dra) {
                snd_ac97_pcm_double_rate_rules(runtime);
        }
        if (chip->smp20bit) {
                runtime->hw.formats |= SNDRV_PCM_FMTBIT_S32_LE;
                snd_pcm_hw_constraint_msbits(runtime, 0, 32, 20);
        }
        return 0;
}

static int snd_intel8x0_playback_close(struct snd_pcm_substream *substream)
{
        struct intel8x0 *chip = snd_pcm_substream_chip(substream);

        chip->ichd[ICHD_PCMOUT].substream = NULL;
        return 0;
}

static int snd_intel8x0_capture_open(struct snd_pcm_substream *substream)
{
        struct intel8x0 *chip = snd_pcm_substream_chip(substream);

        return snd_intel8x0_pcm_open(substream, &chip->ichd[ICHD_PCMIN]);
}

static int snd_intel8x0_capture_close(struct snd_pcm_substream *substream)
{
        struct intel8x0 *chip = snd_pcm_substream_chip(substream);

        chip->ichd[ICHD_PCMIN].substream = NULL;
        return 0;
}

static int snd_intel8x0_mic_open(struct snd_pcm_substream *substream)
{
        struct intel8x0 *chip = snd_pcm_substream_chip(substream);

        return snd_intel8x0_pcm_open(substream, &chip->ichd[ICHD_MIC]);
}

static int snd_intel8x0_mic_close(struct snd_pcm_substream *substream)
{
        struct intel8x0 *chip = snd_pcm_substream_chip(substream);

        chip->ichd[ICHD_MIC].substream = NULL;
        return 0;
}

static int snd_intel8x0_mic2_open(struct snd_pcm_substream *substream)
{
        struct intel8x0 *chip = snd_pcm_substream_chip(substream);

        return snd_intel8x0_pcm_open(substream, &chip->ichd[ICHD_MIC2]);
}

static int snd_intel8x0_mic2_close(struct snd_pcm_substream *substream)
{
        struct intel8x0 *chip = snd_pcm_substream_chip(substream);

        chip->ichd[ICHD_MIC2].substream = NULL;
        return 0;
}

static int snd_intel8x0_capture2_open(struct snd_pcm_substream *substream)
{
        struct intel8x0 *chip = snd_pcm_substream_chip(substream);

        return snd_intel8x0_pcm_open(substream, &chip->ichd[ICHD_PCM2IN]);
}

static int snd_intel8x0_capture2_close(struct snd_pcm_substream *substream)
{
        struct intel8x0 *chip = snd_pcm_substream_chip(substream);

        chip->ichd[ICHD_PCM2IN].substream = NULL;
        return 0;
}

static int snd_intel8x0_spdif_open(struct snd_pcm_substream *substream)
{
        struct intel8x0 *chip = snd_pcm_substream_chip(substream);
        int idx = chip->device_type == DEVICE_NFORCE ? NVD_SPBAR : ICHD_SPBAR;

        return snd_intel8x0_pcm_open(substream, &chip->ichd[idx]);
}

static int snd_intel8x0_spdif_close(struct snd_pcm_substream *substream)
{
        struct intel8x0 *chip = snd_pcm_substream_chip(substream);
        int idx = chip->device_type == DEVICE_NFORCE ? NVD_SPBAR : ICHD_SPBAR;

        chip->ichd[idx].substream = NULL;
        return 0;
}

static int snd_intel8x0_ali_ac97spdifout_open(struct snd_pcm_substream *substream)
{
        struct intel8x0 *chip = snd_pcm_substream_chip(substream);
        unsigned int val;

        spin_lock_irq(&chip->reg_lock);
        val = igetdword(chip, ICHREG(ALI_INTERFACECR));
        val |= ICH_ALI_IF_AC97SP;
        iputdword(chip, ICHREG(ALI_INTERFACECR), val);
        /* also needs to set ALI_SC_CODEC_SPDF correctly */
        spin_unlock_irq(&chip->reg_lock);

        return snd_intel8x0_pcm_open(substream, &chip->ichd[ALID_AC97SPDIFOUT]);
}

static int snd_intel8x0_ali_ac97spdifout_close(struct snd_pcm_substream *substream)
{
        struct intel8x0 *chip = snd_pcm_substream_chip(substream);
        unsigned int val;

        chip->ichd[ALID_AC97SPDIFOUT].substream = NULL;
        spin_lock_irq(&chip->reg_lock);
        val = igetdword(chip, ICHREG(ALI_INTERFACECR));
        val &= ~ICH_ALI_IF_AC97SP;
        iputdword(chip, ICHREG(ALI_INTERFACECR), val);
        spin_unlock_irq(&chip->reg_lock);

        return 0;
}

#if 0 // NYI
static int snd_intel8x0_ali_spdifin_open(struct snd_pcm_substream *substream)
{
        struct intel8x0 *chip = snd_pcm_substream_chip(substream);

        return snd_intel8x0_pcm_open(substream, &chip->ichd[ALID_SPDIFIN]);
}

static int snd_intel8x0_ali_spdifin_close(struct snd_pcm_substream *substream)
{
        struct intel8x0 *chip = snd_pcm_substream_chip(substream);

        chip->ichd[ALID_SPDIFIN].substream = NULL;
        return 0;
}

static int snd_intel8x0_ali_spdifout_open(struct snd_pcm_substream *substream)
{
        struct intel8x0 *chip = snd_pcm_substream_chip(substream);

        return snd_intel8x0_pcm_open(substream, &chip->ichd[ALID_SPDIFOUT]);
}

static int snd_intel8x0_ali_spdifout_close(struct snd_pcm_substream *substream)
{
        struct intel8x0 *chip = snd_pcm_substream_chip(substream);

        chip->ichd[ALID_SPDIFOUT].substream = NULL;
        return 0;
}
#endif

static struct snd_pcm_ops snd_intel8x0_playback_ops = {
        .open =         snd_intel8x0_playback_open,
        .close =        snd_intel8x0_playback_close,
        .ioctl =        snd_pcm_lib_ioctl,
        .hw_params =    snd_intel8x0_hw_params,
        .hw_free =      snd_intel8x0_hw_free,
        .prepare =      snd_intel8x0_pcm_prepare,
        .trigger =      snd_intel8x0_pcm_trigger,
        .pointer =      snd_intel8x0_pcm_pointer,
};

static struct snd_pcm_ops snd_intel8x0_capture_ops = {
        .open =         snd_intel8x0_capture_open,
        .close =        snd_intel8x0_capture_close,
        .ioctl =        snd_pcm_lib_ioctl,
        .hw_params =    snd_intel8x0_hw_params,
        .hw_free =      snd_intel8x0_hw_free,
        .prepare =      snd_intel8x0_pcm_prepare,
        .trigger =      snd_intel8x0_pcm_trigger,
        .pointer =      snd_intel8x0_pcm_pointer,
};

static struct snd_pcm_ops snd_intel8x0_capture_mic_ops = {
        .open =         snd_intel8x0_mic_open,
        .close =        snd_intel8x0_mic_close,
        .ioctl =        snd_pcm_lib_ioctl,
        .hw_params =    snd_intel8x0_hw_params,
        .hw_free =      snd_intel8x0_hw_free,
        .prepare =      snd_intel8x0_pcm_prepare,
        .trigger =      snd_intel8x0_pcm_trigger,
        .pointer =      snd_intel8x0_pcm_pointer,
};

static struct snd_pcm_ops snd_intel8x0_capture_mic2_ops = {
        .open =         snd_intel8x0_mic2_open,
        .close =        snd_intel8x0_mic2_close,
        .ioctl =        snd_pcm_lib_ioctl,
        .hw_params =    snd_intel8x0_hw_params,
        .hw_free =      snd_intel8x0_hw_free,
        .prepare =      snd_intel8x0_pcm_prepare,
        .trigger =      snd_intel8x0_pcm_trigger,
        .pointer =      snd_intel8x0_pcm_pointer,
};

static struct snd_pcm_ops snd_intel8x0_capture2_ops = {
        .open =         snd_intel8x0_capture2_open,
        .close =        snd_intel8x0_capture2_close,
        .ioctl =        snd_pcm_lib_ioctl,
        .hw_params =    snd_intel8x0_hw_params,
        .hw_free =      snd_intel8x0_hw_free,
        .prepare =      snd_intel8x0_pcm_prepare,
        .trigger =      snd_intel8x0_pcm_trigger,
        .pointer =      snd_intel8x0_pcm_pointer,
};

static struct snd_pcm_ops snd_intel8x0_spdif_ops = {
        .open =         snd_intel8x0_spdif_open,
        .close =        snd_intel8x0_spdif_close,
        .ioctl =        snd_pcm_lib_ioctl,
        .hw_params =    snd_intel8x0_hw_params,
        .hw_free =      snd_intel8x0_hw_free,
        .prepare =      snd_intel8x0_pcm_prepare,
        .trigger =      snd_intel8x0_pcm_trigger,
        .pointer =      snd_intel8x0_pcm_pointer,
};

static struct snd_pcm_ops snd_intel8x0_ali_playback_ops = {
        .open =         snd_intel8x0_playback_open,
        .close =        snd_intel8x0_playback_close,
        .ioctl =        snd_pcm_lib_ioctl,
        .hw_params =    snd_intel8x0_hw_params,
        .hw_free =      snd_intel8x0_hw_free,
        .prepare =      snd_intel8x0_pcm_prepare,
        .trigger =      snd_intel8x0_ali_trigger,
        .pointer =      snd_intel8x0_pcm_pointer,
};

static struct snd_pcm_ops snd_intel8x0_ali_capture_ops = {
        .open =         snd_intel8x0_capture_open,
        .close =        snd_intel8x0_capture_close,
        .ioctl =        snd_pcm_lib_ioctl,
        .hw_params =    snd_intel8x0_hw_params,
        .hw_free =      snd_intel8x0_hw_free,
        .prepare =      snd_intel8x0_pcm_prepare,
        .trigger =      snd_intel8x0_ali_trigger,
        .pointer =      snd_intel8x0_pcm_pointer,
};

static struct snd_pcm_ops snd_intel8x0_ali_capture_mic_ops = {
        .open =         snd_intel8x0_mic_open,
        .close =        snd_intel8x0_mic_close,
        .ioctl =        snd_pcm_lib_ioctl,
        .hw_params =    snd_intel8x0_hw_params,
        .hw_free =      snd_intel8x0_hw_free,
        .prepare =      snd_intel8x0_pcm_prepare,
        .trigger =      snd_intel8x0_ali_trigger,
        .pointer =      snd_intel8x0_pcm_pointer,
};

static struct snd_pcm_ops snd_intel8x0_ali_ac97spdifout_ops = {
        .open =         snd_intel8x0_ali_ac97spdifout_open,
        .close =        snd_intel8x0_ali_ac97spdifout_close,
        .ioctl =        snd_pcm_lib_ioctl,
        .hw_params =    snd_intel8x0_hw_params,
        .hw_free =      snd_intel8x0_hw_free,
        .prepare =      snd_intel8x0_pcm_prepare,
        .trigger =      snd_intel8x0_ali_trigger,
        .pointer =      snd_intel8x0_pcm_pointer,
};

#if 0 // NYI
static struct snd_pcm_ops snd_intel8x0_ali_spdifin_ops = {
        .open =         snd_intel8x0_ali_spdifin_open,
        .close =        snd_intel8x0_ali_spdifin_close,
        .ioctl =        snd_pcm_lib_ioctl,
        .hw_params =    snd_intel8x0_hw_params,
        .hw_free =      snd_intel8x0_hw_free,
        .prepare =      snd_intel8x0_pcm_prepare,
        .trigger =      snd_intel8x0_pcm_trigger,
        .pointer =      snd_intel8x0_pcm_pointer,
};

static struct snd_pcm_ops snd_intel8x0_ali_spdifout_ops = {
        .open =         snd_intel8x0_ali_spdifout_open,
        .close =        snd_intel8x0_ali_spdifout_close,
        .ioctl =        snd_pcm_lib_ioctl,
        .hw_params =    snd_intel8x0_hw_params,
        .hw_free =      snd_intel8x0_hw_free,
        .prepare =      snd_intel8x0_pcm_prepare,
        .trigger =      snd_intel8x0_pcm_trigger,
        .pointer =      snd_intel8x0_pcm_pointer,
};
#endif // NYI

struct ich_pcm_table {
        char *suffix;
        struct snd_pcm_ops *playback_ops;
        struct snd_pcm_ops *capture_ops;
        size_t prealloc_size;
        size_t prealloc_max_size;
        int ac97_idx;
};

static int snd_intel8x0_pcm1(struct intel8x0 *chip, int device,
                             struct ich_pcm_table *rec)
{
        struct snd_pcm *pcm;
        int err;
        char name[32];

        if (rec->suffix)
                sprintf(name, "Intel ICH - %s", rec->suffix);
        else
                strcpy(name, "Intel ICH");
        err = snd_pcm_new(chip->card, name, device,
                          rec->playback_ops ? 1 : 0,
                          rec->capture_ops ? 1 : 0, &pcm);
        if (err < 0)
                return err;

        if (rec->playback_ops)
                snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, rec->playback_ops);
        if (rec->capture_ops)
                snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, rec->capture_ops);

        pcm->private_data = chip;
        pcm->info_flags = 0;
        if (rec->suffix)
                sprintf(pcm->name, "%s - %s", chip->card->shortname, rec->suffix);
        else
                strcpy(pcm->name, chip->card->shortname);
        chip->pcm[device] = pcm;

        snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
                                              snd_dma_pci_data(chip->pci),
                                              rec->prealloc_size, rec->prealloc_max_size);

        if (rec->playback_ops &&
            rec->playback_ops->open == snd_intel8x0_playback_open) {
                struct snd_pcm_chmap *chmap;
                int chs = 2;
                if (chip->multi8)
                        chs = 8;
                else if (chip->multi6)
                        chs = 6;
                else if (chip->multi4)
                        chs = 4;
                err = snd_pcm_add_chmap_ctls(pcm, SNDRV_PCM_STREAM_PLAYBACK,
                                             snd_pcm_alt_chmaps, chs, 0,
                                             &chmap);
                if (err < 0)
                        return err;
                chmap->channel_mask = SND_PCM_CHMAP_MASK_2468;
                chip->ac97[0]->chmaps[SNDRV_PCM_STREAM_PLAYBACK] = chmap;
        }

        return 0;
}

static struct ich_pcm_table intel_pcms[] = {
        {
                .playback_ops = &snd_intel8x0_playback_ops,
                .capture_ops = &snd_intel8x0_capture_ops,
                .prealloc_size = 64 * 1024,
                .prealloc_max_size = 128 * 1024,
        },
        {
                .suffix = "MIC ADC",
                .capture_ops = &snd_intel8x0_capture_mic_ops,
                .prealloc_size = 0,
                .prealloc_max_size = 128 * 1024,
                .ac97_idx = ICHD_MIC,
        },
        {
                .suffix = "MIC2 ADC",
                .capture_ops = &snd_intel8x0_capture_mic2_ops,
                .prealloc_size = 0,
                .prealloc_max_size = 128 * 1024,
                .ac97_idx = ICHD_MIC2,
        },
        {
                .suffix = "ADC2",
                .capture_ops = &snd_intel8x0_capture2_ops,
                .prealloc_size = 0,
                .prealloc_max_size = 128 * 1024,
                .ac97_idx = ICHD_PCM2IN,
        },
        {
                .suffix = "IEC958",
                .playback_ops = &snd_intel8x0_spdif_ops,
                .prealloc_size = 64 * 1024,
                .prealloc_max_size = 128 * 1024,
                .ac97_idx = ICHD_SPBAR,
        },
};

static struct ich_pcm_table nforce_pcms[] = {
        {
                .playback_ops = &snd_intel8x0_playback_ops,
                .capture_ops = &snd_intel8x0_capture_ops,
                .prealloc_size = 64 * 1024,
                .prealloc_max_size = 128 * 1024,
        },
        {
                .suffix = "MIC ADC",
                .capture_ops = &snd_intel8x0_capture_mic_ops,
                .prealloc_size = 0,
                .prealloc_max_size = 128 * 1024,
                .ac97_idx = NVD_MIC,
        },
        {
                .suffix = "IEC958",
                .playback_ops = &snd_intel8x0_spdif_ops,
                .prealloc_size = 64 * 1024,
                .prealloc_max_size = 128 * 1024,
                .ac97_idx = NVD_SPBAR,
        },
};

static struct ich_pcm_table ali_pcms[] = {
        {
                .playback_ops = &snd_intel8x0_ali_playback_ops,
                .capture_ops = &snd_intel8x0_ali_capture_ops,
                .prealloc_size = 64 * 1024,
                .prealloc_max_size = 128 * 1024,
        },
        {
                .suffix = "MIC ADC",
                .capture_ops = &snd_intel8x0_ali_capture_mic_ops,
                .prealloc_size = 0,
                .prealloc_max_size = 128 * 1024,
                .ac97_idx = ALID_MIC,
        },
        {
                .suffix = "IEC958",
                .playback_ops = &snd_intel8x0_ali_ac97spdifout_ops,
                /* .capture_ops = &snd_intel8x0_ali_spdifin_ops, */
                .prealloc_size = 64 * 1024,
                .prealloc_max_size = 128 * 1024,
                .ac97_idx = ALID_AC97SPDIFOUT,
        },
#if 0 // NYI
        {
                .suffix = "HW IEC958",
                .playback_ops = &snd_intel8x0_ali_spdifout_ops,
                .prealloc_size = 64 * 1024,
                .prealloc_max_size = 128 * 1024,
        },
#endif
};

static int snd_intel8x0_pcm(struct intel8x0 *chip)
{
        int i, tblsize, device, err;
        struct ich_pcm_table *tbl, *rec;

        switch (chip->device_type) {
        case DEVICE_INTEL_ICH4:
                tbl = intel_pcms;
                tblsize = ARRAY_SIZE(intel_pcms);
                if (spdif_aclink)
                        tblsize--;
                break;
        case DEVICE_NFORCE:
                tbl = nforce_pcms;
                tblsize = ARRAY_SIZE(nforce_pcms);
                if (spdif_aclink)
                        tblsize--;
                break;
        case DEVICE_ALI:
                tbl = ali_pcms;
                tblsize = ARRAY_SIZE(ali_pcms);
                break;
        default:
                tbl = intel_pcms;
                tblsize = 2;
                break;
        }

        device = 0;
        for (i = 0; i < tblsize; i++) {
                rec = tbl + i;
                if (i > 0 && rec->ac97_idx) {
                        /* activate PCM only when associated AC'97 codec */
                        if (! chip->ichd[rec->ac97_idx].pcm)
                                continue;
                }
                err = snd_intel8x0_pcm1(chip, device, rec);
                if (err < 0)
                        return err;
                device++;
        }

        chip->pcm_devs = device;
        return 0;
}
        

/*
 *  Mixer part
 */

static void snd_intel8x0_mixer_free_ac97_bus(struct snd_ac97_bus *bus)
{
        struct intel8x0 *chip = bus->private_data;
        chip->ac97_bus = NULL;
}

static void snd_intel8x0_mixer_free_ac97(struct snd_ac97 *ac97)
{
        struct intel8x0 *chip = ac97->private_data;
        chip->ac97[ac97->num] = NULL;
}

static struct ac97_pcm ac97_pcm_defs[] = {
        /* front PCM */
        {
                .exclusive = 1,
                .r = {  {
                                .slots = (1 << AC97_SLOT_PCM_LEFT) |
                                         (1 << AC97_SLOT_PCM_RIGHT) |
                                         (1 << AC97_SLOT_PCM_CENTER) |
                                         (1 << AC97_SLOT_PCM_SLEFT) |
                                         (1 << AC97_SLOT_PCM_SRIGHT) |
                                         (1 << AC97_SLOT_LFE)
                        },
                        {
                                .slots = (1 << AC97_SLOT_PCM_LEFT) |
                                         (1 << AC97_SLOT_PCM_RIGHT) |
                                         (1 << AC97_SLOT_PCM_LEFT_0) |
                                         (1 << AC97_SLOT_PCM_RIGHT_0)
                        }
                }
        },
        /* PCM IN #1 */
        {
                .stream = 1,
                .exclusive = 1,
                .r = {  {
                                .slots = (1 << AC97_SLOT_PCM_LEFT) |
                                         (1 << AC97_SLOT_PCM_RIGHT)
                        }
                }
        },
        /* MIC IN #1 */
        {
                .stream = 1,
                .exclusive = 1,
                .r = {  {
                                .slots = (1 << AC97_SLOT_MIC)
                        }
                }
        },
        /* S/PDIF PCM */
        {
                .exclusive = 1,
                .spdif = 1,
                .r = {  {
                                .slots = (1 << AC97_SLOT_SPDIF_LEFT2) |
                                         (1 << AC97_SLOT_SPDIF_RIGHT2)
                        }
                }
        },
        /* PCM IN #2 */
        {
                .stream = 1,
                .exclusive = 1,
                .r = {  {
                                .slots = (1 << AC97_SLOT_PCM_LEFT) |
                                         (1 << AC97_SLOT_PCM_RIGHT)
                        }
                }
        },
        /* MIC IN #2 */
        {
                .stream = 1,
                .exclusive = 1,
                .r = {  {
                                .slots = (1 << AC97_SLOT_MIC)
                        }
                }
        },
};

static const struct ac97_quirk ac97_quirks[] = {
        {
                .subvendor = 0x0e11,
                .subdevice = 0x000e,
                .name = "Compaq Deskpro EN",    /* AD1885 */
                .type = AC97_TUNE_HP_ONLY
        },
        {
                .subvendor = 0x0e11,
                .subdevice = 0x008a,
                .name = "Compaq Evo W4000",     /* AD1885 */
                .type = AC97_TUNE_HP_ONLY
        },
        {
                .subvendor = 0x0e11,
                .subdevice = 0x00b8,
                .name = "Compaq Evo D510C",
                .type = AC97_TUNE_HP_ONLY
        },
        {
                .subvendor = 0x0e11,
                .subdevice = 0x0860,
                .name = "HP/Compaq nx7010",
                .type = AC97_TUNE_MUTE_LED
        },
        {
                .subvendor = 0x1014,
                .subdevice = 0x0534,
                .name = "ThinkPad X31",
                .type = AC97_TUNE_INV_EAPD
        },
        {
                .subvendor = 0x1014,
                .subdevice = 0x1f00,
                .name = "MS-9128",
                .type = AC97_TUNE_ALC_JACK
        },
        {
                .subvendor = 0x1014,
                .subdevice = 0x0267,
                .name = "IBM NetVista A30p",    /* AD1981B */
                .type = AC97_TUNE_HP_ONLY
        },
        {
                .subvendor = 0x1025,
                .subdevice = 0x0082,
                .name = "Acer Travelmate 2310",
                .type = AC97_TUNE_HP_ONLY
        },
        {
                .subvendor = 0x1025,
                .subdevice = 0x0083,
                .name = "Acer Aspire 3003LCi",
                .type = AC97_TUNE_HP_ONLY
        },
        {
                .subvendor = 0x1028,
                .subdevice = 0x00d8,
                .name = "Dell Precision 530",   /* AD1885 */
                .type = AC97_TUNE_HP_ONLY
        },
        {
                .subvendor = 0x1028,
                .subdevice = 0x010d,
                .name = "Dell", /* which model?  AD1885 */
                .type = AC97_TUNE_HP_ONLY
        },
        {
                .subvendor = 0x1028,
                .subdevice = 0x0126,
                .name = "Dell Optiplex GX260",  /* AD1981A */
                .type = AC97_TUNE_HP_ONLY
        },
        {
                .subvendor = 0x1028,
                .subdevice = 0x012c,
                .name = "Dell Precision 650",   /* AD1981A */
                .type = AC97_TUNE_HP_ONLY
        },
        {
                .subvendor = 0x1028,
                .subdevice = 0x012d,
                .name = "Dell Precision 450",   /* AD1981B*/
                .type = AC97_TUNE_HP_ONLY
        },
        {
                .subvendor = 0x1028,
                .subdevice = 0x0147,
                .name = "Dell", /* which model?  AD1981B*/
                .type = AC97_TUNE_HP_ONLY
        },
        {
                .subvendor = 0x1028,
                .subdevice = 0x0151,
                .name = "Dell Optiplex GX270",  /* AD1981B */
                .type = AC97_TUNE_HP_ONLY
        },
        {
                .subvendor = 0x1028,
                .subdevice = 0x014e,
                .name = "Dell D800", /* STAC9750/51 */
                .type = AC97_TUNE_HP_ONLY
        },
        {
                .subvendor = 0x1028,
                .subdevice = 0x0163,
                .name = "Dell Unknown", /* STAC9750/51 */
                .type = AC97_TUNE_HP_ONLY
        },
        {
                .subvendor = 0x1028,
                .subdevice = 0x016a,
                .name = "Dell Inspiron 8600",   /* STAC9750/51 */
                .type = AC97_TUNE_HP_ONLY
        },
        {
                .subvendor = 0x1028,
                .subdevice = 0x0182,
                .name = "Dell Latitude D610",   /* STAC9750/51 */
                .type = AC97_TUNE_HP_ONLY
        },
        {
                .subvendor = 0x1028,
                .subdevice = 0x0186,
                .name = "Dell Latitude D810", /* cf. Malone #41015 */
                .type = AC97_TUNE_HP_MUTE_LED
        },
        {
                .subvendor = 0x1028,
                .subdevice = 0x0188,
                .name = "Dell Inspiron 6000",
                .type = AC97_TUNE_HP_MUTE_LED /* cf. Malone #41015 */
        },
        {
                .subvendor = 0x1028,
                .subdevice = 0x0189,
                .name = "Dell Inspiron 9300",
                .type = AC97_TUNE_HP_MUTE_LED
        },
        {
                .subvendor = 0x1028,
                .subdevice = 0x0191,
                .name = "Dell Inspiron 8600",
                .type = AC97_TUNE_HP_ONLY
        },
        {
                .subvendor = 0x103c,
                .subdevice = 0x006d,
                .name = "HP zv5000",
                .type = AC97_TUNE_MUTE_LED      /*AD1981B*/
        },
        {       /* FIXME: which codec? */
                .subvendor = 0x103c,
                .subdevice = 0x00c3,
                .name = "HP xw6000",
                .type = AC97_TUNE_HP_ONLY
        },
        {
                .subvendor = 0x103c,
                .subdevice = 0x088c,
                .name = "HP nc8000",
                .type = AC97_TUNE_HP_MUTE_LED
        },
        {
                .subvendor = 0x103c,
                .subdevice = 0x0890,
                .name = "HP nc6000",
                .type = AC97_TUNE_MUTE_LED
        },
        {
                .subvendor = 0x103c,
                .subdevice = 0x129d,
                .name = "HP xw8000",
                .type = AC97_TUNE_HP_ONLY
        },
        {
                .subvendor = 0x103c,
                .subdevice = 0x0938,
                .name = "HP nc4200",
                .type = AC97_TUNE_HP_MUTE_LED
        },
        {
                .subvendor = 0x103c,
                .subdevice = 0x099c,
                .name = "HP nx6110/nc6120",
                .type = AC97_TUNE_HP_MUTE_LED
        },
        {
                .subvendor = 0x103c,
                .subdevice = 0x0944,
                .name = "HP nc6220",
                .type = AC97_TUNE_HP_MUTE_LED
        },
        {
                .subvendor = 0x103c,
                .subdevice = 0x0934,
                .name = "HP nc8220",
                .type = AC97_TUNE_HP_MUTE_LED
        },
        {
                .subvendor = 0x103c,
                .subdevice = 0x12f1,
                .name = "HP xw8200",    /* AD1981B*/

                .type = AC97_TUNE_HP_ONLY
        },
        {
                .subvendor = 0x103c,
                .subdevice = 0x12f2,
                .name = "HP xw6200",
                .type = AC97_TUNE_HP_ONLY
        },
        {
                .subvendor = 0x103c,
                .subdevice = 0x3008,
                .name = "HP xw4200",    /* AD1981B*/
                .type = AC97_TUNE_HP_ONLY
        },
        {
                .subvendor = 0x104d,
                .subdevice = 0x8144,
                .name = "Sony",
                .type = AC97_TUNE_INV_EAPD
        },
        {
                .subvendor = 0x104d,
                .subdevice = 0x8197,
                .name = "Sony S1XP",
                .type = AC97_TUNE_INV_EAPD
        },
        {
                .subvendor = 0x104d,
                .subdevice = 0x81c0,
                .name = "Sony VAIO VGN-T350P", /*AD1981B*/
                .type = AC97_TUNE_INV_EAPD
        },
        {
                .subvendor = 0x104d,
                .subdevice = 0x81c5,
                .name = "Sony VAIO VGN-B1VP", /*AD1981B*/
                .type = AC97_TUNE_INV_EAPD
        },
        {
                .subvendor = 0x1043,
                .subdevice = 0x80f3,
                .name = "ASUS ICH5/AD1985",
                .type = AC97_TUNE_AD_SHARING
        },
        {
                .subvendor = 0x10cf,
                .subdevice = 0x11c3,
                .name = "Fujitsu-Siemens E4010",
                .type = AC97_TUNE_HP_ONLY
        },
        {
                .subvendor = 0x10cf,
                .subdevice = 0x1225,
                .name = "Fujitsu-Siemens T3010",
                .type = AC97_TUNE_HP_ONLY
        },
        {
                .subvendor = 0x10cf,
                .subdevice = 0x1253,
                .name = "Fujitsu S6210",        /* STAC9750/51 */
                .type = AC97_TUNE_HP_ONLY
        },
        {
                .subvendor = 0x10cf,
                .subdevice = 0x127d,
                .name = "Fujitsu Lifebook P7010",
                .type = AC97_TUNE_HP_ONLY
        },
        {
                .subvendor = 0x10cf,
                .subdevice = 0x127e,
                .name = "Fujitsu Lifebook C1211D",
                .type = AC97_TUNE_HP_ONLY
        },
        {
                .subvendor = 0x10cf,
                .subdevice = 0x12ec,
                .name = "Fujitsu-Siemens 4010",
                .type = AC97_TUNE_HP_ONLY
        },
        {
                .subvendor = 0x10cf,
                .subdevice = 0x12f2,
                .name = "Fujitsu-Siemens Celsius H320",
                .type = AC97_TUNE_SWAP_HP
        },
        {
                .subvendor = 0x10f1,
                .subdevice = 0x2665,
                .name = "Fujitsu-Siemens Celsius",      /* AD1981? */
                .type = AC97_TUNE_HP_ONLY
        },
        {
                .subvendor = 0x10f1,
                .subdevice = 0x2885,
                .name = "AMD64 Mobo",   /* ALC650 */
                .type = AC97_TUNE_HP_ONLY
        },
        {
                .subvendor = 0x10f1,
                .subdevice = 0x2895,
                .name = "Tyan Thunder K8WE",
                .type = AC97_TUNE_HP_ONLY
        },
        {
                .subvendor = 0x10f7,
                .subdevice = 0x834c,
                .name = "Panasonic CF-R4",
                .type = AC97_TUNE_HP_ONLY,
        },
        {
                .subvendor = 0x110a,
                .subdevice = 0x0056,
                .name = "Fujitsu-Siemens Scenic",       /* AD1981? */
                .type = AC97_TUNE_HP_ONLY
        },
        {
                .subvendor = 0x11d4,
                .subdevice = 0x5375,
                .name = "ADI AD1985 (discrete)",
                .type = AC97_TUNE_HP_ONLY
        },
        {
                .subvendor = 0x1462,
                .subdevice = 0x5470,
                .name = "MSI P4 ATX 645 Ultra",
                .type = AC97_TUNE_HP_ONLY
        },
        {
                .subvendor = 0x161f,
                .subdevice = 0x202f,
                .name = "Gateway M520",
                .type = AC97_TUNE_INV_EAPD
        },
        {
                .subvendor = 0x161f,
                .subdevice = 0x203a,
                .name = "Gateway 4525GZ",               /* AD1981B */
                .type = AC97_TUNE_INV_EAPD
        },
        {
                .subvendor = 0x1734,
                .subdevice = 0x0088,
                .name = "Fujitsu-Siemens D1522",        /* AD1981 */
                .type = AC97_TUNE_HP_ONLY
        },
        {
                .subvendor = 0x8086,
                .subdevice = 0x2000,
                .mask = 0xfff0,
                .name = "Intel ICH5/AD1985",
                .type = AC97_TUNE_AD_SHARING
        },
        {
                .subvendor = 0x8086,
                .subdevice = 0x4000,
                .mask = 0xfff0,
                .name = "Intel ICH5/AD1985",
                .type = AC97_TUNE_AD_SHARING
        },
        {
                .subvendor = 0x8086,
                .subdevice = 0x4856,
                .name = "Intel D845WN (82801BA)",
                .type = AC97_TUNE_SWAP_HP
        },
        {
                .subvendor = 0x8086,
                .subdevice = 0x4d44,
                .name = "Intel D850EMV2",       /* AD1885 */
                .type = AC97_TUNE_HP_ONLY
        },
        {
                .subvendor = 0x8086,
                .subdevice = 0x4d56,
                .name = "Intel ICH/AD1885",
                .type = AC97_TUNE_HP_ONLY
        },
        {
                .subvendor = 0x8086,
                .subdevice = 0x6000,
                .mask = 0xfff0,
                .name = "Intel ICH5/AD1985",
                .type = AC97_TUNE_AD_SHARING
        },
        {
                .subvendor = 0x8086,
                .subdevice = 0xe000,
                .mask = 0xfff0,
                .name = "Intel ICH5/AD1985",
                .type = AC97_TUNE_AD_SHARING
        },
#if 0 /* FIXME: this seems wrong on most boards */
        {
                .subvendor = 0x8086,
                .subdevice = 0xa000,
                .mask = 0xfff0,
                .name = "Intel ICH5/AD1985",
                .type = AC97_TUNE_HP_ONLY
        },
#endif
        { } /* terminator */
};

static int snd_intel8x0_mixer(struct intel8x0 *chip, int ac97_clock,
                              const char *quirk_override)
{
        struct snd_ac97_bus *pbus;
        struct snd_ac97_template ac97;
        int err;
        unsigned int i, codecs;
        unsigned int glob_sta = 0;
        struct snd_ac97_bus_ops *ops;
        static struct snd_ac97_bus_ops standard_bus_ops = {
                .write = snd_intel8x0_codec_write,
                .read = snd_intel8x0_codec_read,
        };
        static struct snd_ac97_bus_ops ali_bus_ops = {
                .write = snd_intel8x0_ali_codec_write,
                .read = snd_intel8x0_ali_codec_read,
        };

        chip->spdif_idx = -1; /* use PCMOUT (or disabled) */
        if (!spdif_aclink) {
                switch (chip->device_type) {
                case DEVICE_NFORCE:
                        chip->spdif_idx = NVD_SPBAR;
                        break;
                case DEVICE_ALI:
                        chip->spdif_idx = ALID_AC97SPDIFOUT;
                        break;
                case DEVICE_INTEL_ICH4:
                        chip->spdif_idx = ICHD_SPBAR;
                        break;
                }
        }

        chip->in_ac97_init = 1;
        
        memset(&ac97, 0, sizeof(ac97));
        ac97.private_data = chip;
        ac97.private_free = snd_intel8x0_mixer_free_ac97;
        ac97.scaps = AC97_SCAP_SKIP_MODEM | AC97_SCAP_POWER_SAVE;
        if (chip->xbox)
                ac97.scaps |= AC97_SCAP_DETECT_BY_VENDOR;
        if (chip->device_type != DEVICE_ALI) {
                glob_sta = igetdword(chip, ICHREG(GLOB_STA));
                ops = &standard_bus_ops;
                chip->in_sdin_init = 1;
                codecs = 0;
                for (i = 0; i < chip->max_codecs; i++) {
                        if (! (glob_sta & chip->codec_bit[i]))
                                continue;
                        if (chip->device_type == DEVICE_INTEL_ICH4) {
                                snd_intel8x0_codec_read_test(chip, codecs);
                                chip->ac97_sdin[codecs] =
                                        igetbyte(chip, ICHREG(SDM)) & ICH_LDI_MASK;
                                if (snd_BUG_ON(chip->ac97_sdin[codecs] >= 3))
                                        chip->ac97_sdin[codecs] = 0;
                        } else
                                chip->ac97_sdin[codecs] = i;
                        codecs++;
                }
                chip->in_sdin_init = 0;
                if (! codecs)
                        codecs = 1;
        } else {
                ops = &ali_bus_ops;
                codecs = 1;
                /* detect the secondary codec */
                for (i = 0; i < 100; i++) {
                        unsigned int reg = igetdword(chip, ICHREG(ALI_RTSR));
                        if (reg & 0x40) {
                                codecs = 2;
                                break;
                        }
                        iputdword(chip, ICHREG(ALI_RTSR), reg | 0x40);
                        udelay(1);
                }
        }
        if ((err = snd_ac97_bus(chip->card, 0, ops, chip, &pbus)) < 0)
                goto __err;
        pbus->private_free = snd_intel8x0_mixer_free_ac97_bus;
        if (ac97_clock >= 8000 && ac97_clock <= 48000)
                pbus->clock = ac97_clock;
        /* FIXME: my test board doesn't work well with VRA... */
        if (chip->device_type == DEVICE_ALI)
                pbus->no_vra = 1;
        else
                pbus->dra = 1;
        chip->ac97_bus = pbus;
        chip->ncodecs = codecs;

        ac97.pci = chip->pci;
        for (i = 0; i < codecs; i++) {
                ac97.num = i;
                if ((err = snd_ac97_mixer(pbus, &ac97, &chip->ac97[i])) < 0) {
                        if (err != -EACCES)
                                dev_err(chip->card->dev,
                                        "Unable to initialize codec #%d\n", i);
                        if (i == 0)
                                goto __err;
                }
        }
        /* tune up the primary codec */
        snd_ac97_tune_hardware(chip->ac97[0], ac97_quirks, quirk_override);
        /* enable separate SDINs for ICH4 */
        if (chip->device_type == DEVICE_INTEL_ICH4)
                pbus->isdin = 1;
        /* find the available PCM streams */
        i = ARRAY_SIZE(ac97_pcm_defs);
        if (chip->device_type != DEVICE_INTEL_ICH4)
                i -= 2;         /* do not allocate PCM2IN and MIC2 */
        if (chip->spdif_idx < 0)
                i--;            /* do not allocate S/PDIF */
        err = snd_ac97_pcm_assign(pbus, i, ac97_pcm_defs);
        if (err < 0)
                goto __err;
        chip->ichd[ICHD_PCMOUT].pcm = &pbus->pcms[0];
        chip->ichd[ICHD_PCMIN].pcm = &pbus->pcms[1];
        chip->ichd[ICHD_MIC].pcm = &pbus->pcms[2];
        if (chip->spdif_idx >= 0)
                chip->ichd[chip->spdif_idx].pcm = &pbus->pcms[3];
        if (chip->device_type == DEVICE_INTEL_ICH4) {
                chip->ichd[ICHD_PCM2IN].pcm = &pbus->pcms[4];
                chip->ichd[ICHD_MIC2].pcm = &pbus->pcms[5];
        }
        /* enable separate SDINs for ICH4 */
        if (chip->device_type == DEVICE_INTEL_ICH4) {
                struct ac97_pcm *pcm = chip->ichd[ICHD_PCM2IN].pcm;
                u8 tmp = igetbyte(chip, ICHREG(SDM));
                tmp &= ~(ICH_DI2L_MASK|ICH_DI1L_MASK);
                if (pcm) {
                        tmp |= ICH_SE;  /* steer enable for multiple SDINs */
                        tmp |= chip->ac97_sdin[0] << ICH_DI1L_SHIFT;
                        for (i = 1; i < 4; i++) {
                                if (pcm->r[0].codec[i]) {
                                        tmp |= chip->ac97_sdin[pcm->r[0].codec[1]->num] << ICH_DI2L_SHIFT;
                                        break;
                                }
                        }
                } else {
                        tmp &= ~ICH_SE; /* steer disable */
                }
                iputbyte(chip, ICHREG(SDM), tmp);
        }
        if (pbus->pcms[0].r[0].slots & (1 << AC97_SLOT_PCM_SLEFT)) {
                chip->multi4 = 1;
                if (pbus->pcms[0].r[0].slots & (1 << AC97_SLOT_LFE)) {
                        chip->multi6 = 1;
                        if (chip->ac97[0]->flags & AC97_HAS_8CH)
                                chip->multi8 = 1;
                }
        }
        if (pbus->pcms[0].r[1].rslots[0]) {
                chip->dra = 1;
        }
        if (chip->device_type == DEVICE_INTEL_ICH4) {
                if ((igetdword(chip, ICHREG(GLOB_STA)) & ICH_SAMPLE_CAP) == ICH_SAMPLE_16_20)
                        chip->smp20bit = 1;
        }
        if (chip->device_type == DEVICE_NFORCE && !spdif_aclink) {
                /* 48kHz only */
                chip->ichd[chip->spdif_idx].pcm->rates = SNDRV_PCM_RATE_48000;
        }
        if (chip->device_type == DEVICE_INTEL_ICH4 && !spdif_aclink) {
                /* use slot 10/11 for SPDIF */
                u32 val;
                val = igetdword(chip, ICHREG(GLOB_CNT)) & ~ICH_PCM_SPDIF_MASK;
                val |= ICH_PCM_SPDIF_1011;
                iputdword(chip, ICHREG(GLOB_CNT), val);
                snd_ac97_update_bits(chip->ac97[0], AC97_EXTENDED_STATUS, 0x03 << 4, 0x03 << 4);
        }
        chip->in_ac97_init = 0;
        return 0;

 __err:
        /* clear the cold-reset bit for the next chance */
        if (chip->device_type != DEVICE_ALI)
                iputdword(chip, ICHREG(GLOB_CNT),
                          igetdword(chip, ICHREG(GLOB_CNT)) & ~ICH_AC97COLD);
        return err;
}


/*
 *
 */

static void do_ali_reset(struct intel8x0 *chip)
{
        iputdword(chip, ICHREG(ALI_SCR), ICH_ALI_SC_RESET);
        iputdword(chip, ICHREG(ALI_FIFOCR1), 0x83838383);
        iputdword(chip, ICHREG(ALI_FIFOCR2), 0x83838383);
        iputdword(chip, ICHREG(ALI_FIFOCR3), 0x83838383);
        iputdword(chip, ICHREG(ALI_INTERFACECR),
                  ICH_ALI_IF_PI|ICH_ALI_IF_PO);
        iputdword(chip, ICHREG(ALI_INTERRUPTCR), 0x00000000);
        iputdword(chip, ICHREG(ALI_INTERRUPTSR), 0x00000000);
}

#ifdef CONFIG_SND_AC97_POWER_SAVE
static struct snd_pci_quirk ich_chip_reset_mode[] = {
        SND_PCI_QUIRK(0x1014, 0x051f, "Thinkpad R32", 1),
        { } /* end */
};

static int snd_intel8x0_ich_chip_cold_reset(struct intel8x0 *chip)
{
        unsigned int cnt;
        /* ACLink on, 2 channels */

        if (snd_pci_quirk_lookup(chip->pci, ich_chip_reset_mode))
                return -EIO;

        cnt = igetdword(chip, ICHREG(GLOB_CNT));
        cnt &= ~(ICH_ACLINK | ICH_PCM_246_MASK);

        /* do cold reset - the full ac97 powerdown may leave the controller
         * in a warm state but actually it cannot communicate with the codec.
         */
        iputdword(chip, ICHREG(GLOB_CNT), cnt & ~ICH_AC97COLD);
        cnt = igetdword(chip, ICHREG(GLOB_CNT));
        udelay(10);
        iputdword(chip, ICHREG(GLOB_CNT), cnt | ICH_AC97COLD);
        msleep(1);
        return 0;
}
#define snd_intel8x0_ich_chip_can_cold_reset(chip) \
        (!snd_pci_quirk_lookup(chip->pci, ich_chip_reset_mode))
#else
#define snd_intel8x0_ich_chip_cold_reset(chip)  0
#define snd_intel8x0_ich_chip_can_cold_reset(chip) (0)
#endif

static int snd_intel8x0_ich_chip_reset(struct intel8x0 *chip)
{
        unsigned long end_time;
        unsigned int cnt;
        /* ACLink on, 2 channels */
        cnt = igetdword(chip, ICHREG(GLOB_CNT));
        cnt &= ~(ICH_ACLINK | ICH_PCM_246_MASK);
        /* finish cold or do warm reset */
        cnt |= (cnt & ICH_AC97COLD) == 0 ? ICH_AC97COLD : ICH_AC97WARM;
        iputdword(chip, ICHREG(GLOB_CNT), cnt);
        end_time = (jiffies + (HZ / 4)) + 1;
        do {
                if ((igetdword(chip, ICHREG(GLOB_CNT)) & ICH_AC97WARM) == 0)
                        return 0;
                schedule_timeout_uninterruptible(1);
        } while (time_after_eq(end_time, jiffies));
        dev_err(chip->card->dev, "AC'97 warm reset still in progress? [0x%x]\n",
                   igetdword(chip, ICHREG(GLOB_CNT)));
        return -EIO;
}

static int snd_intel8x0_ich_chip_init(struct intel8x0 *chip, int probing)
{
        unsigned long end_time;
        unsigned int status, nstatus;
        unsigned int cnt;
        int err;

        /* put logic to right state */
        /* first clear status bits */
        status = ICH_RCS | ICH_MCINT | ICH_POINT | ICH_PIINT;
        if (chip->device_type == DEVICE_NFORCE)
                status |= ICH_NVSPINT;
        cnt = igetdword(chip, ICHREG(GLOB_STA));
        iputdword(chip, ICHREG(GLOB_STA), cnt & status);

        if (snd_intel8x0_ich_chip_can_cold_reset(chip))
                err = snd_intel8x0_ich_chip_cold_reset(chip);
        else
                err = snd_intel8x0_ich_chip_reset(chip);
        if (err < 0)
                return err;

        if (probing) {
                /* wait for any codec ready status.
                 * Once it becomes ready it should remain ready
                 * as long as we do not disable the ac97 link.
                 */
                end_time = jiffies + HZ;
                do {
                        status = igetdword(chip, ICHREG(GLOB_STA)) &
                                chip->codec_isr_bits;
                        if (status)
                                break;
                        schedule_timeout_uninterruptible(1);
                } while (time_after_eq(end_time, jiffies));
                if (! status) {
                        /* no codec is found */
                        dev_err(chip->card->dev,
                                "codec_ready: codec is not ready [0x%x]\n",
                                   igetdword(chip, ICHREG(GLOB_STA)));
                        return -EIO;
                }

                /* wait for other codecs ready status. */
                end_time = jiffies + HZ / 4;
                while (status != chip->codec_isr_bits &&
                       time_after_eq(end_time, jiffies)) {
                        schedule_timeout_uninterruptible(1);
                        status |= igetdword(chip, ICHREG(GLOB_STA)) &
                                chip->codec_isr_bits;
                }

        } else {
                /* resume phase */
                int i;
                status = 0;
                for (i = 0; i < chip->ncodecs; i++)
                        if (chip->ac97[i])
                                status |= chip->codec_bit[chip->ac97_sdin[i]];
                /* wait until all the probed codecs are ready */
                end_time = jiffies + HZ;
                do {
                        nstatus = igetdword(chip, ICHREG(GLOB_STA)) &
                                chip->codec_isr_bits;
                        if (status == nstatus)
                                break;
                        schedule_timeout_uninterruptible(1);
                } while (time_after_eq(end_time, jiffies));
        }

        if (chip->device_type == DEVICE_SIS) {
                /* unmute the output on SIS7012 */
                iputword(chip, 0x4c, igetword(chip, 0x4c) | 1);
        }
        if (chip->device_type == DEVICE_NFORCE && !spdif_aclink) {
                /* enable SPDIF interrupt */
                unsigned int val;
                pci_read_config_dword(chip->pci, 0x4c, &val);
                val |= 0x1000000;
                pci_write_config_dword(chip->pci, 0x4c, val);
        }
        return 0;
}

static int snd_intel8x0_ali_chip_init(struct intel8x0 *chip, int probing)
{
        u32 reg;
        int i = 0;

        reg = igetdword(chip, ICHREG(ALI_SCR));
        if ((reg & 2) == 0)     /* Cold required */
                reg |= 2;
        else
                reg |= 1;       /* Warm */
        reg &= ~0x80000000;     /* ACLink on */
        iputdword(chip, ICHREG(ALI_SCR), reg);

        for (i = 0; i < HZ / 2; i++) {
                if (! (igetdword(chip, ICHREG(ALI_INTERRUPTSR)) & ALI_INT_GPIO))
                        goto __ok;
                schedule_timeout_uninterruptible(1);
        }
        dev_err(chip->card->dev, "AC'97 reset failed.\n");
        if (probing)
                return -EIO;

 __ok:
        for (i = 0; i < HZ / 2; i++) {
                reg = igetdword(chip, ICHREG(ALI_RTSR));
                if (reg & 0x80) /* primary codec */
                        break;
                iputdword(chip, ICHREG(ALI_RTSR), reg | 0x80);
                schedule_timeout_uninterruptible(1);
        }

        do_ali_reset(chip);
        return 0;
}

static int snd_intel8x0_chip_init(struct intel8x0 *chip, int probing)
{
        unsigned int i, timeout;
        int err;
        
        if (chip->device_type != DEVICE_ALI) {
                if ((err = snd_intel8x0_ich_chip_init(chip, probing)) < 0)
                        return err;
                iagetword(chip, 0);     /* clear semaphore flag */
        } else {
                if ((err = snd_intel8x0_ali_chip_init(chip, probing)) < 0)
                        return err;
        }

        /* disable interrupts */
        for (i = 0; i < chip->bdbars_count; i++)
                iputbyte(chip, ICH_REG_OFF_CR + chip->ichd[i].reg_offset, 0x00);
        /* reset channels */
        for (i = 0; i < chip->bdbars_count; i++)
                iputbyte(chip, ICH_REG_OFF_CR + chip->ichd[i].reg_offset, ICH_RESETREGS);
        for (i = 0; i < chip->bdbars_count; i++) {
                timeout = 100000;
                while (--timeout != 0) {
                        if ((igetbyte(chip, ICH_REG_OFF_CR + chip->ichd[i].reg_offset) & ICH_RESETREGS) == 0)
                                break;
                }
                if (timeout == 0)
                        dev_err(chip->card->dev, "reset of registers failed?\n");
        }
        /* initialize Buffer Descriptor Lists */
        for (i = 0; i < chip->bdbars_count; i++)
                iputdword(chip, ICH_REG_OFF_BDBAR + chip->ichd[i].reg_offset,
                          chip->ichd[i].bdbar_addr);
        return 0;
}

static int snd_intel8x0_free(struct intel8x0 *chip)
{
        unsigned int i;

        if (chip->irq < 0)
                goto __hw_end;
        /* disable interrupts */
        for (i = 0; i < chip->bdbars_count; i++)
                iputbyte(chip, ICH_REG_OFF_CR + chip->ichd[i].reg_offset, 0x00);
        /* reset channels */
        for (i = 0; i < chip->bdbars_count; i++)
                iputbyte(chip, ICH_REG_OFF_CR + chip->ichd[i].reg_offset, ICH_RESETREGS);
        if (chip->device_type == DEVICE_NFORCE && !spdif_aclink) {
                /* stop the spdif interrupt */
                unsigned int val;
                pci_read_config_dword(chip->pci, 0x4c, &val);
                val &= ~0x1000000;
                pci_write_config_dword(chip->pci, 0x4c, val);
        }
        /* --- */

      __hw_end:
        if (chip->irq >= 0)
                free_irq(chip->irq, chip);
        if (chip->bdbars.area) {
                if (chip->fix_nocache)
                        fill_nocache(chip->bdbars.area, chip->bdbars.bytes, 0);
                snd_dma_free_pages(&chip->bdbars);
        }
        if (chip->addr)
                pci_iounmap(chip->pci, chip->addr);
        if (chip->bmaddr)
                pci_iounmap(chip->pci, chip->bmaddr);
        pci_release_regions(chip->pci);
        pci_disable_device(chip->pci);
        kfree(chip);
        return 0;
}

#ifdef CONFIG_PM_SLEEP
/*
 * power management
 */
static int intel8x0_suspend(struct device *dev)
{
        struct snd_card *card = dev_get_drvdata(dev);
        struct intel8x0 *chip = card->private_data;
        int i;

        snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
        for (i = 0; i < chip->pcm_devs; i++)
                snd_pcm_suspend_all(chip->pcm[i]);
        /* clear nocache */
        if (chip->fix_nocache) {
                for (i = 0; i < chip->bdbars_count; i++) {
                        struct ichdev *ichdev = &chip->ichd[i];
                        if (ichdev->substream && ichdev->page_attr_changed) {
                                struct snd_pcm_runtime *runtime = ichdev->substream->runtime;
                                if (runtime->dma_area)
                                        fill_nocache(runtime->dma_area, runtime->dma_bytes, 0);
                        }
                }
        }
        for (i = 0; i < chip->ncodecs; i++)
                snd_ac97_suspend(chip->ac97[i]);
        if (chip->device_type == DEVICE_INTEL_ICH4)
                chip->sdm_saved = igetbyte(chip, ICHREG(SDM));

        if (chip->irq >= 0) {
                free_irq(chip->irq, chip);
                chip->irq = -1;
        }
        return 0;
}

static int intel8x0_resume(struct device *dev)
{
        struct pci_dev *pci = to_pci_dev(dev);
        struct snd_card *card = dev_get_drvdata(dev);
        struct intel8x0 *chip = card->private_data;
        int i;

        snd_intel8x0_chip_init(chip, 0);
        if (request_irq(pci->irq, snd_intel8x0_interrupt,
                        IRQF_SHARED, KBUILD_MODNAME, chip)) {
                dev_err(dev, "unable to grab IRQ %d, disabling device\n",
                        pci->irq);
                snd_card_disconnect(card);
                return -EIO;
        }
        chip->irq = pci->irq;
        synchronize_irq(chip->irq);

        /* re-initialize mixer stuff */
        if (chip->device_type == DEVICE_INTEL_ICH4 && !spdif_aclink) {
                /* enable separate SDINs for ICH4 */
                iputbyte(chip, ICHREG(SDM), chip->sdm_saved);
                /* use slot 10/11 for SPDIF */
                iputdword(chip, ICHREG(GLOB_CNT),
                          (igetdword(chip, ICHREG(GLOB_CNT)) & ~ICH_PCM_SPDIF_MASK) |
                          ICH_PCM_SPDIF_1011);
        }

        /* refill nocache */
        if (chip->fix_nocache)
                fill_nocache(chip->bdbars.area, chip->bdbars.bytes, 1);

        for (i = 0; i < chip->ncodecs; i++)
                snd_ac97_resume(chip->ac97[i]);

        /* refill nocache */
        if (chip->fix_nocache) {
                for (i = 0; i < chip->bdbars_count; i++) {
                        struct ichdev *ichdev = &chip->ichd[i];
                        if (ichdev->substream && ichdev->page_attr_changed) {
                                struct snd_pcm_runtime *runtime = ichdev->substream->runtime;
                                if (runtime->dma_area)
                                        fill_nocache(runtime->dma_area, runtime->dma_bytes, 1);
                        }
                }
        }

        /* resume status */
        for (i = 0; i < chip->bdbars_count; i++) {
                struct ichdev *ichdev = &chip->ichd[i];
                unsigned long port = ichdev->reg_offset;
                if (! ichdev->substream || ! ichdev->suspended)
                        continue;
                if (ichdev->ichd == ICHD_PCMOUT)
                        snd_intel8x0_setup_pcm_out(chip, ichdev->substream->runtime);
                iputdword(chip, port + ICH_REG_OFF_BDBAR, ichdev->bdbar_addr);
                iputbyte(chip, port + ICH_REG_OFF_LVI, ichdev->lvi);
                iputbyte(chip, port + ICH_REG_OFF_CIV, ichdev->civ);
                iputbyte(chip, port + ichdev->roff_sr, ICH_FIFOE | ICH_BCIS | ICH_LVBCI);
        }

        snd_power_change_state(card, SNDRV_CTL_POWER_D0);
        return 0;
}

static SIMPLE_DEV_PM_OPS(intel8x0_pm, intel8x0_suspend, intel8x0_resume);
#define INTEL8X0_PM_OPS &intel8x0_pm
#else
#define INTEL8X0_PM_OPS NULL
#endif /* CONFIG_PM_SLEEP */

#define INTEL8X0_TESTBUF_SIZE   32768   /* enough large for one shot */

static void intel8x0_measure_ac97_clock(struct intel8x0 *chip)
{
        struct snd_pcm_substream *subs;
        struct ichdev *ichdev;
        unsigned long port;
        unsigned long pos, pos1, t;
        int civ, timeout = 1000, attempt = 1;
        ktime_t start_time, stop_time;

        if (chip->ac97_bus->clock != 48000)
                return; /* specified in module option */

      __again:
        subs = chip->pcm[0]->streams[0].substream;
        if (! subs || subs->dma_buffer.bytes < INTEL8X0_TESTBUF_SIZE) {
                dev_warn(chip->card->dev,
                         "no playback buffer allocated - aborting measure ac97 clock\n");
                return;
        }
        ichdev = &chip->ichd[ICHD_PCMOUT];
        ichdev->physbuf = subs->dma_buffer.addr;
        ichdev->size = ichdev->fragsize = INTEL8X0_TESTBUF_SIZE;
        ichdev->substream = NULL; /* don't process interrupts */

        /* set rate */
        if (snd_ac97_set_rate(chip->ac97[0], AC97_PCM_FRONT_DAC_RATE, 48000) < 0) {
                dev_err(chip->card->dev, "cannot set ac97 rate: clock = %d\n",
                        chip->ac97_bus->clock);
                return;
        }
        snd_intel8x0_setup_periods(chip, ichdev);
        port = ichdev->reg_offset;
        spin_lock_irq(&chip->reg_lock);
        chip->in_measurement = 1;
        /* trigger */
        if (chip->device_type != DEVICE_ALI)
                iputbyte(chip, port + ICH_REG_OFF_CR, ICH_IOCE | ICH_STARTBM);
        else {
                iputbyte(chip, port + ICH_REG_OFF_CR, ICH_IOCE);
                iputdword(chip, ICHREG(ALI_DMACR), 1 << ichdev->ali_slot);
        }
        start_time = ktime_get();
        spin_unlock_irq(&chip->reg_lock);
        msleep(50);
        spin_lock_irq(&chip->reg_lock);
        /* check the position */
        do {
                civ = igetbyte(chip, ichdev->reg_offset + ICH_REG_OFF_CIV);
                pos1 = igetword(chip, ichdev->reg_offset + ichdev->roff_picb);
                if (pos1 == 0) {
                        udelay(10);
                        continue;
                }
                if (civ == igetbyte(chip, ichdev->reg_offset + ICH_REG_OFF_CIV) &&
                    pos1 == igetword(chip, ichdev->reg_offset + ichdev->roff_picb))
                        break;
        } while (timeout--);
        if (pos1 == 0) {        /* oops, this value is not reliable */
                pos = 0;
        } else {
                pos = ichdev->fragsize1;
                pos -= pos1 << ichdev->pos_shift;
                pos += ichdev->position;
        }
        chip->in_measurement = 0;
        stop_time = ktime_get();
        /* stop */
        if (chip->device_type == DEVICE_ALI) {
                iputdword(chip, ICHREG(ALI_DMACR), 1 << (ichdev->ali_slot + 16));
                iputbyte(chip, port + ICH_REG_OFF_CR, 0);
                while (igetbyte(chip, port + ICH_REG_OFF_CR))
                        ;
        } else {
                iputbyte(chip, port + ICH_REG_OFF_CR, 0);
                while (!(igetbyte(chip, port + ichdev->roff_sr) & ICH_DCH))
                        ;
        }
        iputbyte(chip, port + ICH_REG_OFF_CR, ICH_RESETREGS);
        spin_unlock_irq(&chip->reg_lock);

        if (pos == 0) {
                dev_err(chip->card->dev,
                        "measure - unreliable DMA position..\n");
              __retry:
                if (attempt < 3) {
                        msleep(300);
                        attempt++;
                        goto __again;
                }
                goto __end;
        }

        pos /= 4;
        t = ktime_us_delta(stop_time, start_time);
        dev_info(chip->card->dev,
                 "%s: measured %lu usecs (%lu samples)\n", __func__, t, pos);
        if (t == 0) {
                dev_err(chip->card->dev, "?? calculation error..\n");
                goto __retry;
        }
        pos *= 1000;
        pos = (pos / t) * 1000 + ((pos % t) * 1000) / t;
        if (pos < 40000 || pos >= 60000) {
                /* abnormal value. hw problem? */
                dev_info(chip->card->dev, "measured clock %ld rejected\n", pos);
                goto __retry;
        } else if (pos > 40500 && pos < 41500)
                /* first exception - 41000Hz reference clock */
                chip->ac97_bus->clock = 41000;
        else if (pos > 43600 && pos < 44600)
                /* second exception - 44100HZ reference clock */
                chip->ac97_bus->clock = 44100;
        else if (pos < 47500 || pos > 48500)
                /* not 48000Hz, tuning the clock.. */
                chip->ac97_bus->clock = (chip->ac97_bus->clock * 48000) / pos;
      __end:
        dev_info(chip->card->dev, "clocking to %d\n", chip->ac97_bus->clock);
        snd_ac97_update_power(chip->ac97[0], AC97_PCM_FRONT_DAC_RATE, 0);
}

static struct snd_pci_quirk intel8x0_clock_list[] = {
        SND_PCI_QUIRK(0x0e11, 0x008a, "AD1885", 41000),
        SND_PCI_QUIRK(0x1014, 0x0581, "AD1981B", 48000),
        SND_PCI_QUIRK(0x1028, 0x00be, "AD1885", 44100),
        SND_PCI_QUIRK(0x1028, 0x0177, "AD1980", 48000),
        SND_PCI_QUIRK(0x1028, 0x01ad, "AD1981B", 48000),
        SND_PCI_QUIRK(0x1043, 0x80f3, "AD1985", 48000),
        { }     /* terminator */
};

static int intel8x0_in_clock_list(struct intel8x0 *chip)
{
        struct pci_dev *pci = chip->pci;
        const struct snd_pci_quirk *wl;

        wl = snd_pci_quirk_lookup(pci, intel8x0_clock_list);
        if (!wl)
                return 0;
        dev_info(chip->card->dev, "white list rate for %04x:%04x is %i\n",
               pci->subsystem_vendor, pci->subsystem_device, wl->value);
        chip->ac97_bus->clock = wl->value;
        return 1;
}

static void snd_intel8x0_proc_read(struct snd_info_entry * entry,
                                   struct snd_info_buffer *buffer)
{
        struct intel8x0 *chip = entry->private_data;
        unsigned int tmp;

        snd_iprintf(buffer, "Intel8x0\n\n");
        if (chip->device_type == DEVICE_ALI)
                return;
        tmp = igetdword(chip, ICHREG(GLOB_STA));
        snd_iprintf(buffer, "Global control        : 0x%08x\n", igetdword(chip, ICHREG(GLOB_CNT)));
        snd_iprintf(buffer, "Global status         : 0x%08x\n", tmp);
        if (chip->device_type == DEVICE_INTEL_ICH4)
                snd_iprintf(buffer, "SDM                   : 0x%08x\n", igetdword(chip, ICHREG(SDM)));
        snd_iprintf(buffer, "AC'97 codecs ready    :");
        if (tmp & chip->codec_isr_bits) {
                int i;
                static const char *codecs[3] = {
                        "primary", "secondary", "tertiary"
                };
                for (i = 0; i < chip->max_codecs; i++)
                        if (tmp & chip->codec_bit[i])
                                snd_iprintf(buffer, " %s", codecs[i]);
        } else
                snd_iprintf(buffer, " none");
        snd_iprintf(buffer, "\n");
        if (chip->device_type == DEVICE_INTEL_ICH4 ||
            chip->device_type == DEVICE_SIS)
                snd_iprintf(buffer, "AC'97 codecs SDIN     : %i %i %i\n",
                        chip->ac97_sdin[0],
                        chip->ac97_sdin[1],
                        chip->ac97_sdin[2]);
}

static void snd_intel8x0_proc_init(struct intel8x0 *chip)
{
        struct snd_info_entry *entry;

        if (! snd_card_proc_new(chip->card, "intel8x0", &entry))
                snd_info_set_text_ops(entry, chip, snd_intel8x0_proc_read);
}

static int snd_intel8x0_dev_free(struct snd_device *device)
{
        struct intel8x0 *chip = device->device_data;
        return snd_intel8x0_free(chip);
}

struct ich_reg_info {
        unsigned int int_sta_mask;
        unsigned int offset;
};

static unsigned int ich_codec_bits[3] = {
        ICH_PCR, ICH_SCR, ICH_TCR
};
static unsigned int sis_codec_bits[3] = {
        ICH_PCR, ICH_SCR, ICH_SIS_TCR
};

static int snd_intel8x0_inside_vm(struct pci_dev *pci)
{
        int result  = inside_vm;
        char *msg   = NULL;

        /* check module parameter first (override detection) */
        if (result >= 0) {
                msg = result ? "enable (forced) VM" : "disable (forced) VM";
                goto fini;
        }

        /* detect KVM and Parallels virtual environments */
        result = kvm_para_available();
#ifdef X86_FEATURE_HYPERVISOR
        result = result || boot_cpu_has(X86_FEATURE_HYPERVISOR);
#endif
        if (!result)
                goto fini;

        /* check for known (emulated) devices */
        if (pci->subsystem_vendor == PCI_SUBVENDOR_ID_REDHAT_QUMRANET &&
            pci->subsystem_device == PCI_SUBDEVICE_ID_QEMU) {
                /* KVM emulated sound, PCI SSID: 1af4:1100 */
                msg = "enable KVM";
        } else if (pci->subsystem_vendor == 0x1ab8) {
                /* Parallels VM emulated sound, PCI SSID: 1ab8:xxxx */
                msg = "enable Parallels VM";
        } else {
                msg = "disable (unknown or VT-d) VM";
                result = 0;
        }

fini:
        if (msg != NULL)
                dev_info(&pci->dev, "%s optimization\n", msg);

        return result;