// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Driver for ESS Maestro3/Allegro (ES1988) soundcards.
 * Copyright (c) 2000 by Zach Brown <zab@zabbo.net>
 *                       Takashi Iwai <tiwai@suse.de>
 *
 * Most of the hardware init stuffs are based on maestro3 driver for
 * OSS/Free by Zach Brown.  Many thanks to Zach!
 *
 * ChangeLog:
 * Aug. 27, 2001
 *     - Fixed deadlock on capture
 *     - Added Canyon3D-2 support by Rob Riggs <rob@pangalactic.org>
 */
 
#define CARD_NAME "ESS Maestro3/Allegro/Canyon3D-2"
#define DRIVER_NAME "Maestro3"

#include <linux/io.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/dma-mapping.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/module.h>
#include <linux/firmware.h>
#include <linux/input.h>
#include <sound/core.h>
#include <sound/info.h>
#include <sound/control.h>
#include <sound/pcm.h>
#include <sound/mpu401.h>
#include <sound/ac97_codec.h>
#include <sound/initval.h>
#include <asm/byteorder.h>

MODULE_AUTHOR("Zach Brown <zab@zabbo.net>, Takashi Iwai <tiwai@suse.de>");
MODULE_DESCRIPTION("ESS Maestro3 PCI");
MODULE_LICENSE("GPL");
MODULE_FIRMWARE("ess/maestro3_assp_kernel.fw");
MODULE_FIRMWARE("ess/maestro3_assp_minisrc.fw");

static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;      /* Index 0-MAX */
static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;       /* ID for this card */
static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP; /* all enabled */
static bool external_amp[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};
static int amp_gpio[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = -1};

module_param_array(index, int, NULL, 0444);
MODULE_PARM_DESC(index, "Index value for " CARD_NAME " soundcard.");
module_param_array(id, charp, NULL, 0444);
MODULE_PARM_DESC(id, "ID string for " CARD_NAME " soundcard.");
module_param_array(enable, bool, NULL, 0444);
MODULE_PARM_DESC(enable, "Enable this soundcard.");
module_param_array(external_amp, bool, NULL, 0444);
MODULE_PARM_DESC(external_amp, "Enable external amp for " CARD_NAME " soundcard.");
module_param_array(amp_gpio, int, NULL, 0444);
MODULE_PARM_DESC(amp_gpio, "GPIO pin number for external amp. (default = -1)");

#define MAX_PLAYBACKS   2
#define MAX_CAPTURES    1
#define NR_DSPS         (MAX_PLAYBACKS + MAX_CAPTURES)


/*
 * maestro3 registers
 */

/* Allegro PCI configuration registers */
#define PCI_LEGACY_AUDIO_CTRL   0x40
#define SOUND_BLASTER_ENABLE    0x00000001
#define FM_SYNTHESIS_ENABLE     0x00000002
#define GAME_PORT_ENABLE        0x00000004
#define MPU401_IO_ENABLE        0x00000008
#define MPU401_IRQ_ENABLE       0x00000010
#define ALIAS_10BIT_IO          0x00000020
#define SB_DMA_MASK             0x000000C0
#define SB_DMA_0                0x00000040
#define SB_DMA_1                0x00000040
#define SB_DMA_R                0x00000080
#define SB_DMA_3                0x000000C0
#define SB_IRQ_MASK             0x00000700
#define SB_IRQ_5                0x00000000
#define SB_IRQ_7                0x00000100
#define SB_IRQ_9                0x00000200
#define SB_IRQ_10               0x00000300
#define MIDI_IRQ_MASK           0x00003800
#define SERIAL_IRQ_ENABLE       0x00004000
#define DISABLE_LEGACY          0x00008000

#define PCI_ALLEGRO_CONFIG      0x50
#define SB_ADDR_240             0x00000004
#define MPU_ADDR_MASK           0x00000018
#define MPU_ADDR_330            0x00000000
#define MPU_ADDR_300            0x00000008
#define MPU_ADDR_320            0x00000010
#define MPU_ADDR_340            0x00000018
#define USE_PCI_TIMING          0x00000040
#define POSTED_WRITE_ENABLE     0x00000080
#define DMA_POLICY_MASK         0x00000700
#define DMA_DDMA                0x00000000
#define DMA_TDMA                0x00000100
#define DMA_PCPCI               0x00000200
#define DMA_WBDMA16             0x00000400
#define DMA_WBDMA4              0x00000500
#define DMA_WBDMA2              0x00000600
#define DMA_WBDMA1              0x00000700
#define DMA_SAFE_GUARD          0x00000800
#define HI_PERF_GP_ENABLE       0x00001000
#define PIC_SNOOP_MODE_0        0x00002000
#define PIC_SNOOP_MODE_1        0x00004000
#define SOUNDBLASTER_IRQ_MASK   0x00008000
#define RING_IN_ENABLE          0x00010000
#define SPDIF_TEST_MODE         0x00020000
#define CLK_MULT_MODE_SELECT_2  0x00040000
#define EEPROM_WRITE_ENABLE     0x00080000
#define CODEC_DIR_IN            0x00100000
#define HV_BUTTON_FROM_GD       0x00200000
#define REDUCED_DEBOUNCE        0x00400000
#define HV_CTRL_ENABLE          0x00800000
#define SPDIF_ENABLE            0x01000000
#define CLK_DIV_SELECT          0x06000000
#define CLK_DIV_BY_48           0x00000000
#define CLK_DIV_BY_49           0x02000000
#define CLK_DIV_BY_50           0x04000000
#define CLK_DIV_RESERVED        0x06000000
#define PM_CTRL_ENABLE          0x08000000
#define CLK_MULT_MODE_SELECT    0x30000000
#define CLK_MULT_MODE_SHIFT     28
#define CLK_MULT_MODE_0         0x00000000
#define CLK_MULT_MODE_1         0x10000000
#define CLK_MULT_MODE_2         0x20000000
#define CLK_MULT_MODE_3         0x30000000
#define INT_CLK_SELECT          0x40000000
#define INT_CLK_MULT_RESET      0x80000000

/* M3 */
#define INT_CLK_SRC_NOT_PCI     0x00100000
#define INT_CLK_MULT_ENABLE     0x80000000

#define PCI_ACPI_CONTROL        0x54
#define PCI_ACPI_D0             0x00000000
#define PCI_ACPI_D1             0xB4F70000
#define PCI_ACPI_D2             0xB4F7B4F7

#define PCI_USER_CONFIG         0x58
#define EXT_PCI_MASTER_ENABLE   0x00000001
#define SPDIF_OUT_SELECT        0x00000002
#define TEST_PIN_DIR_CTRL       0x00000004
#define AC97_CODEC_TEST         0x00000020
#define TRI_STATE_BUFFER        0x00000080
#define IN_CLK_12MHZ_SELECT     0x00000100
#define MULTI_FUNC_DISABLE      0x00000200
#define EXT_MASTER_PAIR_SEL     0x00000400
#define PCI_MASTER_SUPPORT      0x00000800
#define STOP_CLOCK_ENABLE       0x00001000
#define EAPD_DRIVE_ENABLE       0x00002000
#define REQ_TRI_STATE_ENABLE    0x00004000
#define REQ_LOW_ENABLE          0x00008000
#define MIDI_1_ENABLE           0x00010000
#define MIDI_2_ENABLE           0x00020000
#define SB_AUDIO_SYNC           0x00040000
#define HV_CTRL_TEST            0x00100000
#define SOUNDBLASTER_TEST       0x00400000

#define PCI_USER_CONFIG_C       0x5C

#define PCI_DDMA_CTRL           0x60
#define DDMA_ENABLE             0x00000001


/* Allegro registers */
#define HOST_INT_CTRL           0x18
#define SB_INT_ENABLE           0x0001
#define MPU401_INT_ENABLE       0x0002
#define ASSP_INT_ENABLE         0x0010
#define RING_INT_ENABLE         0x0020
#define HV_INT_ENABLE           0x0040
#define CLKRUN_GEN_ENABLE       0x0100
#define HV_CTRL_TO_PME          0x0400
#define SOFTWARE_RESET_ENABLE   0x8000

/*
 * should be using the above defines, probably.
 */
#define REGB_ENABLE_RESET               0x01
#define REGB_STOP_CLOCK                 0x10

#define HOST_INT_STATUS         0x1A
#define SB_INT_PENDING          0x01
#define MPU401_INT_PENDING      0x02
#define ASSP_INT_PENDING        0x10
#define RING_INT_PENDING        0x20
#define HV_INT_PENDING          0x40

#define HARDWARE_VOL_CTRL       0x1B
#define SHADOW_MIX_REG_VOICE    0x1C
#define HW_VOL_COUNTER_VOICE    0x1D
#define SHADOW_MIX_REG_MASTER   0x1E
#define HW_VOL_COUNTER_MASTER   0x1F

#define CODEC_COMMAND           0x30
#define CODEC_READ_B            0x80

#define CODEC_STATUS            0x30
#define CODEC_BUSY_B            0x01

#define CODEC_DATA              0x32

#define RING_BUS_CTRL_A         0x36
#define RAC_PME_ENABLE          0x0100
#define RAC_SDFS_ENABLE         0x0200
#define LAC_PME_ENABLE          0x0400
#define LAC_SDFS_ENABLE         0x0800
#define SERIAL_AC_LINK_ENABLE   0x1000
#define IO_SRAM_ENABLE          0x2000
#define IIS_INPUT_ENABLE        0x8000

#define RING_BUS_CTRL_B         0x38
#define SECOND_CODEC_ID_MASK    0x0003
#define SPDIF_FUNC_ENABLE       0x0010
#define SECOND_AC_ENABLE        0x0020
#define SB_MODULE_INTF_ENABLE   0x0040
#define SSPE_ENABLE             0x0040
#define M3I_DOCK_ENABLE         0x0080

#define SDO_OUT_DEST_CTRL       0x3A
#define COMMAND_ADDR_OUT        0x0003
#define PCM_LR_OUT_LOCAL        0x0000
#define PCM_LR_OUT_REMOTE       0x0004
#define PCM_LR_OUT_MUTE         0x0008
#define PCM_LR_OUT_BOTH         0x000C
#define LINE1_DAC_OUT_LOCAL     0x0000
#define LINE1_DAC_OUT_REMOTE    0x0010
#define LINE1_DAC_OUT_MUTE      0x0020
#define LINE1_DAC_OUT_BOTH      0x0030
#define PCM_CLS_OUT_LOCAL       0x0000
#define PCM_CLS_OUT_REMOTE      0x0040
#define PCM_CLS_OUT_MUTE        0x0080
#define PCM_CLS_OUT_BOTH        0x00C0
#define PCM_RLF_OUT_LOCAL       0x0000
#define PCM_RLF_OUT_REMOTE      0x0100
#define PCM_RLF_OUT_MUTE        0x0200
#define PCM_RLF_OUT_BOTH        0x0300
#define LINE2_DAC_OUT_LOCAL     0x0000
#define LINE2_DAC_OUT_REMOTE    0x0400
#define LINE2_DAC_OUT_MUTE      0x0800
#define LINE2_DAC_OUT_BOTH      0x0C00
#define HANDSET_OUT_LOCAL       0x0000
#define HANDSET_OUT_REMOTE      0x1000
#define HANDSET_OUT_MUTE        0x2000
#define HANDSET_OUT_BOTH        0x3000
#define IO_CTRL_OUT_LOCAL       0x0000
#define IO_CTRL_OUT_REMOTE      0x4000
#define IO_CTRL_OUT_MUTE        0x8000
#define IO_CTRL_OUT_BOTH        0xC000

#define SDO_IN_DEST_CTRL        0x3C
#define STATUS_ADDR_IN          0x0003
#define PCM_LR_IN_LOCAL         0x0000
#define PCM_LR_IN_REMOTE        0x0004
#define PCM_LR_RESERVED         0x0008
#define PCM_LR_IN_BOTH          0x000C
#define LINE1_ADC_IN_LOCAL      0x0000
#define LINE1_ADC_IN_REMOTE     0x0010
#define LINE1_ADC_IN_MUTE       0x0020
#define MIC_ADC_IN_LOCAL        0x0000
#define MIC_ADC_IN_REMOTE       0x0040
#define MIC_ADC_IN_MUTE         0x0080
#define LINE2_DAC_IN_LOCAL      0x0000
#define LINE2_DAC_IN_REMOTE     0x0400
#define LINE2_DAC_IN_MUTE       0x0800
#define HANDSET_IN_LOCAL        0x0000
#define HANDSET_IN_REMOTE       0x1000
#define HANDSET_IN_MUTE         0x2000
#define IO_STATUS_IN_LOCAL      0x0000
#define IO_STATUS_IN_REMOTE     0x4000

#define SPDIF_IN_CTRL           0x3E
#define SPDIF_IN_ENABLE         0x0001

#define GPIO_DATA               0x60
#define GPIO_DATA_MASK          0x0FFF
#define GPIO_HV_STATUS          0x3000
#define GPIO_PME_STATUS         0x4000

#define GPIO_MASK               0x64
#define GPIO_DIRECTION          0x68
#define GPO_PRIMARY_AC97        0x0001
#define GPI_LINEOUT_SENSE       0x0004
#define GPO_SECONDARY_AC97      0x0008
#define GPI_VOL_DOWN            0x0010
#define GPI_VOL_UP              0x0020
#define GPI_IIS_CLK             0x0040
#define GPI_IIS_LRCLK           0x0080
#define GPI_IIS_DATA            0x0100
#define GPI_DOCKING_STATUS      0x0100
#define GPI_HEADPHONE_SENSE     0x0200
#define GPO_EXT_AMP_SHUTDOWN    0x1000

#define GPO_EXT_AMP_M3          1       /* default m3 amp */
#define GPO_EXT_AMP_ALLEGRO     8       /* default allegro amp */

/* M3 */
#define GPO_M3_EXT_AMP_SHUTDN   0x0002

#define ASSP_INDEX_PORT         0x80
#define ASSP_MEMORY_PORT        0x82
#define ASSP_DATA_PORT          0x84

#define MPU401_DATA_PORT        0x98
#define MPU401_STATUS_PORT      0x99

#define CLK_MULT_DATA_PORT      0x9C

#define ASSP_CONTROL_A          0xA2
#define ASSP_0_WS_ENABLE        0x01
#define ASSP_CTRL_A_RESERVED1   0x02
#define ASSP_CTRL_A_RESERVED2   0x04
#define ASSP_CLK_49MHZ_SELECT   0x08
#define FAST_PLU_ENABLE         0x10
#define ASSP_CTRL_A_RESERVED3   0x20
#define DSP_CLK_36MHZ_SELECT    0x40

#define ASSP_CONTROL_B          0xA4
#define RESET_ASSP              0x00
#define RUN_ASSP                0x01
#define ENABLE_ASSP_CLOCK       0x00
#define STOP_ASSP_CLOCK         0x10
#define RESET_TOGGLE            0x40

#define ASSP_CONTROL_C          0xA6
#define ASSP_HOST_INT_ENABLE    0x01
#define FM_ADDR_REMAP_DISABLE   0x02
#define HOST_WRITE_PORT_ENABLE  0x08

#define ASSP_HOST_INT_STATUS    0xAC
#define DSP2HOST_REQ_PIORECORD  0x01
#define DSP2HOST_REQ_I2SRATE    0x02
#define DSP2HOST_REQ_TIMER      0x04

/*
 * ASSP control regs
 */
#define DSP_PORT_TIMER_COUNT    0x06

#define DSP_PORT_MEMORY_INDEX   0x80

#define DSP_PORT_MEMORY_TYPE    0x82
#define MEMTYPE_INTERNAL_CODE   0x0002
#define MEMTYPE_INTERNAL_DATA   0x0003
#define MEMTYPE_MASK            0x0003

#define DSP_PORT_MEMORY_DATA    0x84

#define DSP_PORT_CONTROL_REG_A  0xA2
#define DSP_PORT_CONTROL_REG_B  0xA4
#define DSP_PORT_CONTROL_REG_C  0xA6

#define REV_A_CODE_MEMORY_BEGIN         0x0000
#define REV_A_CODE_MEMORY_END           0x0FFF
#define REV_A_CODE_MEMORY_UNIT_LENGTH   0x0040
#define REV_A_CODE_MEMORY_LENGTH        (REV_A_CODE_MEMORY_END - REV_A_CODE_MEMORY_BEGIN + 1)

#define REV_B_CODE_MEMORY_BEGIN         0x0000
#define REV_B_CODE_MEMORY_END           0x0BFF
#define REV_B_CODE_MEMORY_UNIT_LENGTH   0x0040
#define REV_B_CODE_MEMORY_LENGTH        (REV_B_CODE_MEMORY_END - REV_B_CODE_MEMORY_BEGIN + 1)

#define REV_A_DATA_MEMORY_BEGIN         0x1000
#define REV_A_DATA_MEMORY_END           0x2FFF
#define REV_A_DATA_MEMORY_UNIT_LENGTH   0x0080
#define REV_A_DATA_MEMORY_LENGTH        (REV_A_DATA_MEMORY_END - REV_A_DATA_MEMORY_BEGIN + 1)

#define REV_B_DATA_MEMORY_BEGIN         0x1000
#define REV_B_DATA_MEMORY_END           0x2BFF
#define REV_B_DATA_MEMORY_UNIT_LENGTH   0x0080
#define REV_B_DATA_MEMORY_LENGTH        (REV_B_DATA_MEMORY_END - REV_B_DATA_MEMORY_BEGIN + 1)


#define NUM_UNITS_KERNEL_CODE          16
#define NUM_UNITS_KERNEL_DATA           2

#define NUM_UNITS_KERNEL_CODE_WITH_HSP 16
#define NUM_UNITS_KERNEL_DATA_WITH_HSP  5

/*
 * Kernel data layout
 */

#define DP_SHIFT_COUNT                  7

#define KDATA_BASE_ADDR                 0x1000
#define KDATA_BASE_ADDR2                0x1080

#define KDATA_TASK0                     (KDATA_BASE_ADDR + 0x0000)
#define KDATA_TASK1                     (KDATA_BASE_ADDR + 0x0001)
#define KDATA_TASK2                     (KDATA_BASE_ADDR + 0x0002)
#define KDATA_TASK3                     (KDATA_BASE_ADDR + 0x0003)
#define KDATA_TASK4                     (KDATA_BASE_ADDR + 0x0004)
#define KDATA_TASK5                     (KDATA_BASE_ADDR + 0x0005)
#define KDATA_TASK6                     (KDATA_BASE_ADDR + 0x0006)
#define KDATA_TASK7                     (KDATA_BASE_ADDR + 0x0007)
#define KDATA_TASK_ENDMARK              (KDATA_BASE_ADDR + 0x0008)

#define KDATA_CURRENT_TASK              (KDATA_BASE_ADDR + 0x0009)
#define KDATA_TASK_SWITCH               (KDATA_BASE_ADDR + 0x000A)

#define KDATA_INSTANCE0_POS3D           (KDATA_BASE_ADDR + 0x000B)
#define KDATA_INSTANCE1_POS3D           (KDATA_BASE_ADDR + 0x000C)
#define KDATA_INSTANCE2_POS3D           (KDATA_BASE_ADDR + 0x000D)
#define KDATA_INSTANCE3_POS3D           (KDATA_BASE_ADDR + 0x000E)
#define KDATA_INSTANCE4_POS3D           (KDATA_BASE_ADDR + 0x000F)
#define KDATA_INSTANCE5_POS3D           (KDATA_BASE_ADDR + 0x0010)
#define KDATA_INSTANCE6_POS3D           (KDATA_BASE_ADDR + 0x0011)
#define KDATA_INSTANCE7_POS3D           (KDATA_BASE_ADDR + 0x0012)
#define KDATA_INSTANCE8_POS3D           (KDATA_BASE_ADDR + 0x0013)
#define KDATA_INSTANCE_POS3D_ENDMARK    (KDATA_BASE_ADDR + 0x0014)

#define KDATA_INSTANCE0_SPKVIRT         (KDATA_BASE_ADDR + 0x0015)
#define KDATA_INSTANCE_SPKVIRT_ENDMARK  (KDATA_BASE_ADDR + 0x0016)

#define KDATA_INSTANCE0_SPDIF           (KDATA_BASE_ADDR + 0x0017)
#define KDATA_INSTANCE_SPDIF_ENDMARK    (KDATA_BASE_ADDR + 0x0018)

#define KDATA_INSTANCE0_MODEM           (KDATA_BASE_ADDR + 0x0019)
#define KDATA_INSTANCE_MODEM_ENDMARK    (KDATA_BASE_ADDR + 0x001A)

#define KDATA_INSTANCE0_SRC             (KDATA_BASE_ADDR + 0x001B)
#define KDATA_INSTANCE1_SRC             (KDATA_BASE_ADDR + 0x001C)
#define KDATA_INSTANCE_SRC_ENDMARK      (KDATA_BASE_ADDR + 0x001D)

#define KDATA_INSTANCE0_MINISRC         (KDATA_BASE_ADDR + 0x001E)
#define KDATA_INSTANCE1_MINISRC         (KDATA_BASE_ADDR + 0x001F)
#define KDATA_INSTANCE2_MINISRC         (KDATA_BASE_ADDR + 0x0020)
#define KDATA_INSTANCE3_MINISRC         (KDATA_BASE_ADDR + 0x0021)
#define KDATA_INSTANCE_MINISRC_ENDMARK  (KDATA_BASE_ADDR + 0x0022)

#define KDATA_INSTANCE0_CPYTHRU         (KDATA_BASE_ADDR + 0x0023)
#define KDATA_INSTANCE1_CPYTHRU         (KDATA_BASE_ADDR + 0x0024)
#define KDATA_INSTANCE_CPYTHRU_ENDMARK  (KDATA_BASE_ADDR + 0x0025)

#define KDATA_CURRENT_DMA               (KDATA_BASE_ADDR + 0x0026)
#define KDATA_DMA_SWITCH                (KDATA_BASE_ADDR + 0x0027)
#define KDATA_DMA_ACTIVE                (KDATA_BASE_ADDR + 0x0028)

#define KDATA_DMA_XFER0                 (KDATA_BASE_ADDR + 0x0029)
#define KDATA_DMA_XFER1                 (KDATA_BASE_ADDR + 0x002A)
#define KDATA_DMA_XFER2                 (KDATA_BASE_ADDR + 0x002B)
#define KDATA_DMA_XFER3                 (KDATA_BASE_ADDR + 0x002C)
#define KDATA_DMA_XFER4                 (KDATA_BASE_ADDR + 0x002D)
#define KDATA_DMA_XFER5                 (KDATA_BASE_ADDR + 0x002E)
#define KDATA_DMA_XFER6                 (KDATA_BASE_ADDR + 0x002F)
#define KDATA_DMA_XFER7                 (KDATA_BASE_ADDR + 0x0030)
#define KDATA_DMA_XFER8                 (KDATA_BASE_ADDR + 0x0031)
#define KDATA_DMA_XFER_ENDMARK          (KDATA_BASE_ADDR + 0x0032)

#define KDATA_I2S_SAMPLE_COUNT          (KDATA_BASE_ADDR + 0x0033)
#define KDATA_I2S_INT_METER             (KDATA_BASE_ADDR + 0x0034)
#define KDATA_I2S_ACTIVE                (KDATA_BASE_ADDR + 0x0035)

#define KDATA_TIMER_COUNT_RELOAD        (KDATA_BASE_ADDR + 0x0036)
#define KDATA_TIMER_COUNT_CURRENT       (KDATA_BASE_ADDR + 0x0037)

#define KDATA_HALT_SYNCH_CLIENT         (KDATA_BASE_ADDR + 0x0038)
#define KDATA_HALT_SYNCH_DMA            (KDATA_BASE_ADDR + 0x0039)
#define KDATA_HALT_ACKNOWLEDGE          (KDATA_BASE_ADDR + 0x003A)

#define KDATA_ADC1_XFER0                (KDATA_BASE_ADDR + 0x003B)
#define KDATA_ADC1_XFER_ENDMARK         (KDATA_BASE_ADDR + 0x003C)
#define KDATA_ADC1_LEFT_VOLUME                  (KDATA_BASE_ADDR + 0x003D)
#define KDATA_ADC1_RIGHT_VOLUME                 (KDATA_BASE_ADDR + 0x003E)
#define KDATA_ADC1_LEFT_SUR_VOL                 (KDATA_BASE_ADDR + 0x003F)
#define KDATA_ADC1_RIGHT_SUR_VOL                (KDATA_BASE_ADDR + 0x0040)

#define KDATA_ADC2_XFER0                (KDATA_BASE_ADDR + 0x0041)
#define KDATA_ADC2_XFER_ENDMARK         (KDATA_BASE_ADDR + 0x0042)
#define KDATA_ADC2_LEFT_VOLUME                  (KDATA_BASE_ADDR + 0x0043)
#define KDATA_ADC2_RIGHT_VOLUME                 (KDATA_BASE_ADDR + 0x0044)
#define KDATA_ADC2_LEFT_SUR_VOL                 (KDATA_BASE_ADDR + 0x0045)
#define KDATA_ADC2_RIGHT_SUR_VOL                (KDATA_BASE_ADDR + 0x0046)

#define KDATA_CD_XFER0                                  (KDATA_BASE_ADDR + 0x0047)                                      
#define KDATA_CD_XFER_ENDMARK                   (KDATA_BASE_ADDR + 0x0048)
#define KDATA_CD_LEFT_VOLUME                    (KDATA_BASE_ADDR + 0x0049)
#define KDATA_CD_RIGHT_VOLUME                   (KDATA_BASE_ADDR + 0x004A)
#define KDATA_CD_LEFT_SUR_VOL                   (KDATA_BASE_ADDR + 0x004B)
#define KDATA_CD_RIGHT_SUR_VOL                  (KDATA_BASE_ADDR + 0x004C)

#define KDATA_MIC_XFER0                                 (KDATA_BASE_ADDR + 0x004D)
#define KDATA_MIC_XFER_ENDMARK                  (KDATA_BASE_ADDR + 0x004E)
#define KDATA_MIC_VOLUME                                (KDATA_BASE_ADDR + 0x004F)
#define KDATA_MIC_SUR_VOL                               (KDATA_BASE_ADDR + 0x0050)

#define KDATA_I2S_XFER0                 (KDATA_BASE_ADDR + 0x0051)
#define KDATA_I2S_XFER_ENDMARK          (KDATA_BASE_ADDR + 0x0052)

#define KDATA_CHI_XFER0                 (KDATA_BASE_ADDR + 0x0053)
#define KDATA_CHI_XFER_ENDMARK          (KDATA_BASE_ADDR + 0x0054)

#define KDATA_SPDIF_XFER                (KDATA_BASE_ADDR + 0x0055)
#define KDATA_SPDIF_CURRENT_FRAME       (KDATA_BASE_ADDR + 0x0056)
#define KDATA_SPDIF_FRAME0              (KDATA_BASE_ADDR + 0x0057)
#define KDATA_SPDIF_FRAME1              (KDATA_BASE_ADDR + 0x0058)
#define KDATA_SPDIF_FRAME2              (KDATA_BASE_ADDR + 0x0059)

#define KDATA_SPDIF_REQUEST             (KDATA_BASE_ADDR + 0x005A)
#define KDATA_SPDIF_TEMP                (KDATA_BASE_ADDR + 0x005B)

#define KDATA_SPDIFIN_XFER0             (KDATA_BASE_ADDR + 0x005C)
#define KDATA_SPDIFIN_XFER_ENDMARK      (KDATA_BASE_ADDR + 0x005D)
#define KDATA_SPDIFIN_INT_METER         (KDATA_BASE_ADDR + 0x005E)

#define KDATA_DSP_RESET_COUNT           (KDATA_BASE_ADDR + 0x005F)
#define KDATA_DEBUG_OUTPUT              (KDATA_BASE_ADDR + 0x0060)

#define KDATA_KERNEL_ISR_LIST           (KDATA_BASE_ADDR + 0x0061)

#define KDATA_KERNEL_ISR_CBSR1          (KDATA_BASE_ADDR + 0x0062)
#define KDATA_KERNEL_ISR_CBER1          (KDATA_BASE_ADDR + 0x0063)
#define KDATA_KERNEL_ISR_CBCR           (KDATA_BASE_ADDR + 0x0064)
#define KDATA_KERNEL_ISR_AR0            (KDATA_BASE_ADDR + 0x0065)
#define KDATA_KERNEL_ISR_AR1            (KDATA_BASE_ADDR + 0x0066)
#define KDATA_KERNEL_ISR_AR2            (KDATA_BASE_ADDR + 0x0067)
#define KDATA_KERNEL_ISR_AR3            (KDATA_BASE_ADDR + 0x0068)
#define KDATA_KERNEL_ISR_AR4            (KDATA_BASE_ADDR + 0x0069)
#define KDATA_KERNEL_ISR_AR5            (KDATA_BASE_ADDR + 0x006A)
#define KDATA_KERNEL_ISR_BRCR           (KDATA_BASE_ADDR + 0x006B)
#define KDATA_KERNEL_ISR_PASR           (KDATA_BASE_ADDR + 0x006C)
#define KDATA_KERNEL_ISR_PAER           (KDATA_BASE_ADDR + 0x006D)

#define KDATA_CLIENT_SCRATCH0           (KDATA_BASE_ADDR + 0x006E)
#define KDATA_CLIENT_SCRATCH1           (KDATA_BASE_ADDR + 0x006F)
#define KDATA_KERNEL_SCRATCH            (KDATA_BASE_ADDR + 0x0070)
#define KDATA_KERNEL_ISR_SCRATCH        (KDATA_BASE_ADDR + 0x0071)

#define KDATA_OUEUE_LEFT                (KDATA_BASE_ADDR + 0x0072)
#define KDATA_QUEUE_RIGHT               (KDATA_BASE_ADDR + 0x0073)

#define KDATA_ADC1_REQUEST              (KDATA_BASE_ADDR + 0x0074)
#define KDATA_ADC2_REQUEST              (KDATA_BASE_ADDR + 0x0075)
#define KDATA_CD_REQUEST                                (KDATA_BASE_ADDR + 0x0076)
#define KDATA_MIC_REQUEST                               (KDATA_BASE_ADDR + 0x0077)

#define KDATA_ADC1_MIXER_REQUEST        (KDATA_BASE_ADDR + 0x0078)
#define KDATA_ADC2_MIXER_REQUEST        (KDATA_BASE_ADDR + 0x0079)
#define KDATA_CD_MIXER_REQUEST                  (KDATA_BASE_ADDR + 0x007A)
#define KDATA_MIC_MIXER_REQUEST                 (KDATA_BASE_ADDR + 0x007B)
#define KDATA_MIC_SYNC_COUNTER                  (KDATA_BASE_ADDR + 0x007C)

/*
 * second 'segment' (?) reserved for mixer
 * buffers..
 */

#define KDATA_MIXER_WORD0               (KDATA_BASE_ADDR2 + 0x0000)
#define KDATA_MIXER_WORD1               (KDATA_BASE_ADDR2 + 0x0001)
#define KDATA_MIXER_WORD2               (KDATA_BASE_ADDR2 + 0x0002)
#define KDATA_MIXER_WORD3               (KDATA_BASE_ADDR2 + 0x0003)
#define KDATA_MIXER_WORD4               (KDATA_BASE_ADDR2 + 0x0004)
#define KDATA_MIXER_WORD5               (KDATA_BASE_ADDR2 + 0x0005)
#define KDATA_MIXER_WORD6               (KDATA_BASE_ADDR2 + 0x0006)
#define KDATA_MIXER_WORD7               (KDATA_BASE_ADDR2 + 0x0007)
#define KDATA_MIXER_WORD8               (KDATA_BASE_ADDR2 + 0x0008)
#define KDATA_MIXER_WORD9               (KDATA_BASE_ADDR2 + 0x0009)
#define KDATA_MIXER_WORDA               (KDATA_BASE_ADDR2 + 0x000A)
#define KDATA_MIXER_WORDB               (KDATA_BASE_ADDR2 + 0x000B)
#define KDATA_MIXER_WORDC               (KDATA_BASE_ADDR2 + 0x000C)
#define KDATA_MIXER_WORDD               (KDATA_BASE_ADDR2 + 0x000D)
#define KDATA_MIXER_WORDE               (KDATA_BASE_ADDR2 + 0x000E)
#define KDATA_MIXER_WORDF               (KDATA_BASE_ADDR2 + 0x000F)

#define KDATA_MIXER_XFER0               (KDATA_BASE_ADDR2 + 0x0010)
#define KDATA_MIXER_XFER1               (KDATA_BASE_ADDR2 + 0x0011)
#define KDATA_MIXER_XFER2               (KDATA_BASE_ADDR2 + 0x0012)
#define KDATA_MIXER_XFER3               (KDATA_BASE_ADDR2 + 0x0013)
#define KDATA_MIXER_XFER4               (KDATA_BASE_ADDR2 + 0x0014)
#define KDATA_MIXER_XFER5               (KDATA_BASE_ADDR2 + 0x0015)
#define KDATA_MIXER_XFER6               (KDATA_BASE_ADDR2 + 0x0016)
#define KDATA_MIXER_XFER7               (KDATA_BASE_ADDR2 + 0x0017)
#define KDATA_MIXER_XFER8               (KDATA_BASE_ADDR2 + 0x0018)
#define KDATA_MIXER_XFER9               (KDATA_BASE_ADDR2 + 0x0019)
#define KDATA_MIXER_XFER_ENDMARK        (KDATA_BASE_ADDR2 + 0x001A)

#define KDATA_MIXER_TASK_NUMBER         (KDATA_BASE_ADDR2 + 0x001B)
#define KDATA_CURRENT_MIXER             (KDATA_BASE_ADDR2 + 0x001C)
#define KDATA_MIXER_ACTIVE              (KDATA_BASE_ADDR2 + 0x001D)
#define KDATA_MIXER_BANK_STATUS         (KDATA_BASE_ADDR2 + 0x001E)
#define KDATA_DAC_LEFT_VOLUME           (KDATA_BASE_ADDR2 + 0x001F)
#define KDATA_DAC_RIGHT_VOLUME          (KDATA_BASE_ADDR2 + 0x0020)

#define MAX_INSTANCE_MINISRC            (KDATA_INSTANCE_MINISRC_ENDMARK - KDATA_INSTANCE0_MINISRC)
#define MAX_VIRTUAL_DMA_CHANNELS        (KDATA_DMA_XFER_ENDMARK - KDATA_DMA_XFER0)
#define MAX_VIRTUAL_MIXER_CHANNELS      (KDATA_MIXER_XFER_ENDMARK - KDATA_MIXER_XFER0)
#define MAX_VIRTUAL_ADC1_CHANNELS       (KDATA_ADC1_XFER_ENDMARK - KDATA_ADC1_XFER0)

/*
 * client data area offsets
 */
#define CDATA_INSTANCE_READY            0x00

#define CDATA_HOST_SRC_ADDRL            0x01
#define CDATA_HOST_SRC_ADDRH            0x02
#define CDATA_HOST_SRC_END_PLUS_1L      0x03
#define CDATA_HOST_SRC_END_PLUS_1H      0x04
#define CDATA_HOST_SRC_CURRENTL         0x05
#define CDATA_HOST_SRC_CURRENTH         0x06

#define CDATA_IN_BUF_CONNECT            0x07
#define CDATA_OUT_BUF_CONNECT           0x08

#define CDATA_IN_BUF_BEGIN              0x09
#define CDATA_IN_BUF_END_PLUS_1         0x0A
#define CDATA_IN_BUF_HEAD               0x0B
#define CDATA_IN_BUF_TAIL               0x0C
#define CDATA_OUT_BUF_BEGIN             0x0D
#define CDATA_OUT_BUF_END_PLUS_1        0x0E
#define CDATA_OUT_BUF_HEAD              0x0F
#define CDATA_OUT_BUF_TAIL              0x10

#define CDATA_DMA_CONTROL               0x11
#define CDATA_RESERVED                  0x12

#define CDATA_FREQUENCY                 0x13
#define CDATA_LEFT_VOLUME               0x14
#define CDATA_RIGHT_VOLUME              0x15
#define CDATA_LEFT_SUR_VOL              0x16
#define CDATA_RIGHT_SUR_VOL             0x17

#define CDATA_HEADER_LEN                0x18

#define SRC3_DIRECTION_OFFSET           CDATA_HEADER_LEN
#define SRC3_MODE_OFFSET                (CDATA_HEADER_LEN + 1)
#define SRC3_WORD_LENGTH_OFFSET         (CDATA_HEADER_LEN + 2)
#define SRC3_PARAMETER_OFFSET           (CDATA_HEADER_LEN + 3)
#define SRC3_COEFF_ADDR_OFFSET          (CDATA_HEADER_LEN + 8)
#define SRC3_FILTAP_ADDR_OFFSET         (CDATA_HEADER_LEN + 10)
#define SRC3_TEMP_INBUF_ADDR_OFFSET     (CDATA_HEADER_LEN + 16)
#define SRC3_TEMP_OUTBUF_ADDR_OFFSET    (CDATA_HEADER_LEN + 17)

#define MINISRC_IN_BUFFER_SIZE   ( 0x50 * 2 )
#define MINISRC_OUT_BUFFER_SIZE  ( 0x50 * 2 * 2)
#define MINISRC_TMP_BUFFER_SIZE  ( 112 + ( MINISRC_BIQUAD_STAGE * 3 + 4 ) * 2 * 2 )
#define MINISRC_BIQUAD_STAGE    2
#define MINISRC_COEF_LOC          0x175

#define DMACONTROL_BLOCK_MASK           0x000F
#define  DMAC_BLOCK0_SELECTOR           0x0000
#define  DMAC_BLOCK1_SELECTOR           0x0001
#define  DMAC_BLOCK2_SELECTOR           0x0002
#define  DMAC_BLOCK3_SELECTOR           0x0003
#define  DMAC_BLOCK4_SELECTOR           0x0004
#define  DMAC_BLOCK5_SELECTOR           0x0005
#define  DMAC_BLOCK6_SELECTOR           0x0006
#define  DMAC_BLOCK7_SELECTOR           0x0007
#define  DMAC_BLOCK8_SELECTOR           0x0008
#define  DMAC_BLOCK9_SELECTOR           0x0009
#define  DMAC_BLOCKA_SELECTOR           0x000A
#define  DMAC_BLOCKB_SELECTOR           0x000B
#define  DMAC_BLOCKC_SELECTOR           0x000C
#define  DMAC_BLOCKD_SELECTOR           0x000D
#define  DMAC_BLOCKE_SELECTOR           0x000E
#define  DMAC_BLOCKF_SELECTOR           0x000F
#define DMACONTROL_PAGE_MASK            0x00F0
#define  DMAC_PAGE0_SELECTOR            0x0030
#define  DMAC_PAGE1_SELECTOR            0x0020
#define  DMAC_PAGE2_SELECTOR            0x0010
#define  DMAC_PAGE3_SELECTOR            0x0000
#define DMACONTROL_AUTOREPEAT           0x1000
#define DMACONTROL_STOPPED              0x2000
#define DMACONTROL_DIRECTION            0x0100

/*
 * an arbitrary volume we set the internal
 * volume settings to so that the ac97 volume
 * range is a little less insane.  0x7fff is 
 * max.
 */
#define ARB_VOLUME ( 0x6800 )

/*
 */

struct m3_list {
        int curlen;
        int mem_addr;
        int max;
};

struct m3_dma {

        int number;
        struct snd_pcm_substream *substream;

        struct assp_instance {
                unsigned short code, data;
        } inst;

        int running;
        int opened;

        unsigned long buffer_addr;
        int dma_size;
        int period_size;
        unsigned int hwptr;
        int count;

        int index[3];
        struct m3_list *index_list[3];

        int in_lists;
        
        struct list_head list;

};
    
struct snd_m3 {
        
        struct snd_card *card;

        unsigned long iobase;

        int irq;
        unsigned int allegro_flag : 1;

        struct snd_ac97 *ac97;

        struct snd_pcm *pcm;

        struct pci_dev *pci;

        int dacs_active;
        int timer_users;

        struct m3_list  msrc_list;
        struct m3_list  mixer_list;
        struct m3_list  adc1_list;
        struct m3_list  dma_list;

        /* for storing reset state..*/
        u8 reset_state;

        int external_amp;
        int amp_gpio;   /* gpio pin #  for external amp, -1 = default */
        unsigned int hv_config;         /* hardware-volume config bits */
        unsigned irda_workaround :1;    /* avoid to touch 0x10 on GPIO_DIRECTION
                                           (e.g. for IrDA on Dell Inspirons) */
        unsigned is_omnibook :1;        /* Do HP OmniBook GPIO magic? */

        /* midi */
        struct snd_rawmidi *rmidi;

        /* pcm streams */
        int num_substreams;
        struct m3_dma *substreams;

        spinlock_t reg_lock;

#ifdef CONFIG_SND_MAESTRO3_INPUT
        struct input_dev *input_dev;
        char phys[64];                  /* physical device path */
#else
        struct snd_kcontrol *master_switch;
        struct snd_kcontrol *master_volume;
#endif
        struct work_struct hwvol_work;

        unsigned int in_suspend;

#ifdef CONFIG_PM_SLEEP
        u16 *suspend_mem;
#endif

        const struct firmware *assp_kernel_image;
        const struct firmware *assp_minisrc_image;
};

/*
 * pci ids
 */
static const struct pci_device_id snd_m3_ids[] = {
        {PCI_VENDOR_ID_ESS, PCI_DEVICE_ID_ESS_ALLEGRO_1, PCI_ANY_ID, PCI_ANY_ID,
         PCI_CLASS_MULTIMEDIA_AUDIO << 8, 0xffff00, 0},
        {PCI_VENDOR_ID_ESS, PCI_DEVICE_ID_ESS_ALLEGRO, PCI_ANY_ID, PCI_ANY_ID,
         PCI_CLASS_MULTIMEDIA_AUDIO << 8, 0xffff00, 0},
        {PCI_VENDOR_ID_ESS, PCI_DEVICE_ID_ESS_CANYON3D_2LE, PCI_ANY_ID, PCI_ANY_ID,
         PCI_CLASS_MULTIMEDIA_AUDIO << 8, 0xffff00, 0},
        {PCI_VENDOR_ID_ESS, PCI_DEVICE_ID_ESS_CANYON3D_2, PCI_ANY_ID, PCI_ANY_ID,
         PCI_CLASS_MULTIMEDIA_AUDIO << 8, 0xffff00, 0},
        {PCI_VENDOR_ID_ESS, PCI_DEVICE_ID_ESS_MAESTRO3, PCI_ANY_ID, PCI_ANY_ID,
         PCI_CLASS_MULTIMEDIA_AUDIO << 8, 0xffff00, 0},
        {PCI_VENDOR_ID_ESS, PCI_DEVICE_ID_ESS_MAESTRO3_1, PCI_ANY_ID, PCI_ANY_ID,
         PCI_CLASS_MULTIMEDIA_AUDIO << 8, 0xffff00, 0},
        {PCI_VENDOR_ID_ESS, PCI_DEVICE_ID_ESS_MAESTRO3_HW, PCI_ANY_ID, PCI_ANY_ID,
         PCI_CLASS_MULTIMEDIA_AUDIO << 8, 0xffff00, 0},
        {PCI_VENDOR_ID_ESS, PCI_DEVICE_ID_ESS_MAESTRO3_2, PCI_ANY_ID, PCI_ANY_ID,
         PCI_CLASS_MULTIMEDIA_AUDIO << 8, 0xffff00, 0},
        {0,},
};

MODULE_DEVICE_TABLE(pci, snd_m3_ids);

static const struct snd_pci_quirk m3_amp_quirk_list[] = {
        SND_PCI_QUIRK(0x0E11, 0x0094, "Compaq Evo N600c", 0x0c),
        SND_PCI_QUIRK(0x10f7, 0x833e, "Panasonic CF-28", 0x0d),
        SND_PCI_QUIRK(0x10f7, 0x833d, "Panasonic CF-72", 0x0d),
        SND_PCI_QUIRK(0x1033, 0x80f1, "NEC LM800J/7", 0x03),
        SND_PCI_QUIRK(0x1509, 0x1740, "LEGEND ZhaoYang 3100CF", 0x03),
        { } /* END */
};

static const struct snd_pci_quirk m3_irda_quirk_list[] = {
        SND_PCI_QUIRK(0x1028, 0x00b0, "Dell Inspiron 4000", 1),
        SND_PCI_QUIRK(0x1028, 0x00a4, "Dell Inspiron 8000", 1),
        SND_PCI_QUIRK(0x1028, 0x00e6, "Dell Inspiron 8100", 1),
        { } /* END */
};

/* hardware volume quirks */
static const struct snd_pci_quirk m3_hv_quirk_list[] = {
        /* Allegro chips */
        SND_PCI_QUIRK(0x0E11, 0x002E, NULL, HV_CTRL_ENABLE | HV_BUTTON_FROM_GD),
        SND_PCI_QUIRK(0x0E11, 0x0094, NULL, HV_CTRL_ENABLE | HV_BUTTON_FROM_GD),
        SND_PCI_QUIRK(0x0E11, 0xB112, NULL, HV_CTRL_ENABLE | HV_BUTTON_FROM_GD),
        SND_PCI_QUIRK(0x0E11, 0xB114, NULL, HV_CTRL_ENABLE | HV_BUTTON_FROM_GD),
        SND_PCI_QUIRK(0x103C, 0x0012, NULL, HV_CTRL_ENABLE | HV_BUTTON_FROM_GD),
        SND_PCI_QUIRK(0x103C, 0x0018, NULL, HV_CTRL_ENABLE | HV_BUTTON_FROM_GD),
        SND_PCI_QUIRK(0x103C, 0x001C, NULL, HV_CTRL_ENABLE | HV_BUTTON_FROM_GD),
        SND_PCI_QUIRK(0x103C, 0x001D, NULL, HV_CTRL_ENABLE | HV_BUTTON_FROM_GD),
        SND_PCI_QUIRK(0x103C, 0x001E, NULL, HV_CTRL_ENABLE | HV_BUTTON_FROM_GD),
        SND_PCI_QUIRK(0x107B, 0x3350, NULL, HV_CTRL_ENABLE | HV_BUTTON_FROM_GD),
        SND_PCI_QUIRK(0x10F7, 0x8338, NULL, HV_CTRL_ENABLE | HV_BUTTON_FROM_GD),
        SND_PCI_QUIRK(0x10F7, 0x833C, NULL, HV_CTRL_ENABLE | HV_BUTTON_FROM_GD),
        SND_PCI_QUIRK(0x10F7, 0x833D, NULL, HV_CTRL_ENABLE | HV_BUTTON_FROM_GD),
        SND_PCI_QUIRK(0x10F7, 0x833E, NULL, HV_CTRL_ENABLE | HV_BUTTON_FROM_GD),
        SND_PCI_QUIRK(0x10F7, 0x833F, NULL, HV_CTRL_ENABLE | HV_BUTTON_FROM_GD),
        SND_PCI_QUIRK(0x13BD, 0x1018, NULL, HV_CTRL_ENABLE | HV_BUTTON_FROM_GD),
        SND_PCI_QUIRK(0x13BD, 0x1019, NULL, HV_CTRL_ENABLE | HV_BUTTON_FROM_GD),
        SND_PCI_QUIRK(0x13BD, 0x101A, NULL, HV_CTRL_ENABLE | HV_BUTTON_FROM_GD),
        SND_PCI_QUIRK(0x14FF, 0x0F03, NULL, HV_CTRL_ENABLE | HV_BUTTON_FROM_GD),
        SND_PCI_QUIRK(0x14FF, 0x0F04, NULL, HV_CTRL_ENABLE | HV_BUTTON_FROM_GD),
        SND_PCI_QUIRK(0x14FF, 0x0F05, NULL, HV_CTRL_ENABLE | HV_BUTTON_FROM_GD),
        SND_PCI_QUIRK(0x156D, 0xB400, NULL, HV_CTRL_ENABLE | HV_BUTTON_FROM_GD),
        SND_PCI_QUIRK(0x156D, 0xB795, NULL, HV_CTRL_ENABLE | HV_BUTTON_FROM_GD),
        SND_PCI_QUIRK(0x156D, 0xB797, NULL, HV_CTRL_ENABLE | HV_BUTTON_FROM_GD),
        SND_PCI_QUIRK(0x156D, 0xC700, NULL, HV_CTRL_ENABLE | HV_BUTTON_FROM_GD),
        SND_PCI_QUIRK(0x1033, 0x80F1, NULL,
                      HV_CTRL_ENABLE | HV_BUTTON_FROM_GD | REDUCED_DEBOUNCE),
        SND_PCI_QUIRK(0x103C, 0x001A, NULL, /* HP OmniBook 6100 */
                      HV_CTRL_ENABLE | HV_BUTTON_FROM_GD | REDUCED_DEBOUNCE),
        SND_PCI_QUIRK(0x107B, 0x340A, NULL,
                      HV_CTRL_ENABLE | HV_BUTTON_FROM_GD | REDUCED_DEBOUNCE),
        SND_PCI_QUIRK(0x107B, 0x3450, NULL,
                      HV_CTRL_ENABLE | HV_BUTTON_FROM_GD | REDUCED_DEBOUNCE),
        SND_PCI_QUIRK(0x109F, 0x3134, NULL,
                      HV_CTRL_ENABLE | HV_BUTTON_FROM_GD | REDUCED_DEBOUNCE),
        SND_PCI_QUIRK(0x109F, 0x3161, NULL,
                      HV_CTRL_ENABLE | HV_BUTTON_FROM_GD | REDUCED_DEBOUNCE),
        SND_PCI_QUIRK(0x144D, 0x3280, NULL,
                      HV_CTRL_ENABLE | HV_BUTTON_FROM_GD | REDUCED_DEBOUNCE),
        SND_PCI_QUIRK(0x144D, 0x3281, NULL,
                      HV_CTRL_ENABLE | HV_BUTTON_FROM_GD | REDUCED_DEBOUNCE),
        SND_PCI_QUIRK(0x144D, 0xC002, NULL,
                      HV_CTRL_ENABLE | HV_BUTTON_FROM_GD | REDUCED_DEBOUNCE),
        SND_PCI_QUIRK(0x144D, 0xC003, NULL,
                      HV_CTRL_ENABLE | HV_BUTTON_FROM_GD | REDUCED_DEBOUNCE),
        SND_PCI_QUIRK(0x1509, 0x1740, NULL,
                      HV_CTRL_ENABLE | HV_BUTTON_FROM_GD | REDUCED_DEBOUNCE),
        SND_PCI_QUIRK(0x1610, 0x0010, NULL,
                      HV_CTRL_ENABLE | HV_BUTTON_FROM_GD | REDUCED_DEBOUNCE),
        SND_PCI_QUIRK(0x1042, 0x1042, NULL, HV_CTRL_ENABLE),
        SND_PCI_QUIRK(0x107B, 0x9500, NULL, HV_CTRL_ENABLE),
        SND_PCI_QUIRK(0x14FF, 0x0F06, NULL, HV_CTRL_ENABLE),
        SND_PCI_QUIRK(0x1558, 0x8586, NULL, HV_CTRL_ENABLE),
        SND_PCI_QUIRK(0x161F, 0x2011, NULL, HV_CTRL_ENABLE),
        /* Maestro3 chips */
        SND_PCI_QUIRK(0x103C, 0x000E, NULL, HV_CTRL_ENABLE),
        SND_PCI_QUIRK(0x103C, 0x0010, NULL, HV_CTRL_ENABLE),
        SND_PCI_QUIRK(0x103C, 0x0011, NULL, HV_CTRL_ENABLE),
        SND_PCI_QUIRK(0x103C, 0x001B, NULL, HV_CTRL_ENABLE),
        SND_PCI_QUIRK(0x104D, 0x80A6, NULL, HV_CTRL_ENABLE),
        SND_PCI_QUIRK(0x104D, 0x80AA, NULL, HV_CTRL_ENABLE),
        SND_PCI_QUIRK(0x107B, 0x5300, NULL, HV_CTRL_ENABLE),
        SND_PCI_QUIRK(0x110A, 0x1998, NULL, HV_CTRL_ENABLE),
        SND_PCI_QUIRK(0x13BD, 0x1015, NULL, HV_CTRL_ENABLE),
        SND_PCI_QUIRK(0x13BD, 0x101C, NULL, HV_CTRL_ENABLE),
        SND_PCI_QUIRK(0x13BD, 0x1802, NULL, HV_CTRL_ENABLE),
        SND_PCI_QUIRK(0x1599, 0x0715, NULL, HV_CTRL_ENABLE),
        SND_PCI_QUIRK(0x5643, 0x5643, NULL, HV_CTRL_ENABLE),
        SND_PCI_QUIRK(0x144D, 0x3260, NULL, HV_CTRL_ENABLE | REDUCED_DEBOUNCE),
        SND_PCI_QUIRK(0x144D, 0x3261, NULL, HV_CTRL_ENABLE | REDUCED_DEBOUNCE),
        SND_PCI_QUIRK(0x144D, 0xC000, NULL, HV_CTRL_ENABLE | REDUCED_DEBOUNCE),
        SND_PCI_QUIRK(0x144D, 0xC001, NULL, HV_CTRL_ENABLE | REDUCED_DEBOUNCE),
        { } /* END */
};

/* HP Omnibook quirks */
static const struct snd_pci_quirk m3_omnibook_quirk_list[] = {
        SND_PCI_QUIRK_ID(0x103c, 0x0010), /* HP OmniBook 6000 */
        SND_PCI_QUIRK_ID(0x103c, 0x0011), /* HP OmniBook 500 */
        { } /* END */
};

/*
 * lowlevel functions
 */

static inline void snd_m3_outw(struct snd_m3 *chip, u16 value, unsigned long reg)
{
        outw(value, chip->iobase + reg);
}

static inline u16 snd_m3_inw(struct snd_m3 *chip, unsigned long reg)
{
        return inw(chip->iobase + reg);
}

static inline void snd_m3_outb(struct snd_m3 *chip, u8 value, unsigned long reg)
{
        outb(value, chip->iobase + reg);
}

static inline u8 snd_m3_inb(struct snd_m3 *chip, unsigned long reg)
{
        return inb(chip->iobase + reg);
}

/*
 * access 16bit words to the code or data regions of the dsp's memory.
 * index addresses 16bit words.
 */
static u16 snd_m3_assp_read(struct snd_m3 *chip, u16 region, u16 index)
{
        snd_m3_outw(chip, region & MEMTYPE_MASK, DSP_PORT_MEMORY_TYPE);
        snd_m3_outw(chip, index, DSP_PORT_MEMORY_INDEX);
        return snd_m3_inw(chip, DSP_PORT_MEMORY_DATA);
}

static void snd_m3_assp_write(struct snd_m3 *chip, u16 region, u16 index, u16 data)
{
        snd_m3_outw(chip, region & MEMTYPE_MASK, DSP_PORT_MEMORY_TYPE);
        snd_m3_outw(chip, index, DSP_PORT_MEMORY_INDEX);
        snd_m3_outw(chip, data, DSP_PORT_MEMORY_DATA);
}

static void snd_m3_assp_halt(struct snd_m3 *chip)
{
        chip->reset_state = snd_m3_inb(chip, DSP_PORT_CONTROL_REG_B) & ~REGB_STOP_CLOCK;
        msleep(10);
        snd_m3_outb(chip, chip->reset_state & ~REGB_ENABLE_RESET, DSP_PORT_CONTROL_REG_B);
}

static void snd_m3_assp_continue(struct snd_m3 *chip)
{
        snd_m3_outb(chip, chip->reset_state | REGB_ENABLE_RESET, DSP_PORT_CONTROL_REG_B);
}


/*
 * This makes me sad. the maestro3 has lists
 * internally that must be packed.. 0 terminates,
 * apparently, or maybe all unused entries have
 * to be 0, the lists have static lengths set
 * by the binary code images.
 */

static int snd_m3_add_list(struct snd_m3 *chip, struct m3_list *list, u16 val)
{
        snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA,
                          list->mem_addr + list->curlen,
                          val);
        return list->curlen++;
}

static void snd_m3_remove_list(struct snd_m3 *chip, struct m3_list *list, int index)
{
        u16  val;
        int lastindex = list->curlen - 1;

        if (index != lastindex) {
                val = snd_m3_assp_read(chip, MEMTYPE_INTERNAL_DATA,
                                       list->mem_addr + lastindex);
                snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA,
                                  list->mem_addr + index,
                                  val);
        }

        snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA,
                          list->mem_addr + lastindex,
                          0);

        list->curlen--;
}

static void snd_m3_inc_timer_users(struct snd_m3 *chip)
{
        chip->timer_users++;
        if (chip->timer_users != 1) 

                return;

        snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA,
                          KDATA_TIMER_COUNT_RELOAD,
                          240);

        snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA,
                          KDATA_TIMER_COUNT_CURRENT,
                          240);

        snd_m3_outw(chip,
                    snd_m3_inw(chip, HOST_INT_CTRL) | CLKRUN_GEN_ENABLE,
                    HOST_INT_CTRL);
}

static void snd_m3_dec_timer_users(struct snd_m3 *chip)
{
        chip->timer_users--;
        if (chip->timer_users > 0)  
                return;

        snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA,
                          KDATA_TIMER_COUNT_RELOAD,
                          0);

        snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA,
                          KDATA_TIMER_COUNT_CURRENT,
                          0);

        snd_m3_outw(chip,
                    snd_m3_inw(chip, HOST_INT_CTRL) & ~CLKRUN_GEN_ENABLE,
                    HOST_INT_CTRL);
}

/*
 * start/stop
 */

/* spinlock held! */
static int snd_m3_pcm_start(struct snd_m3 *chip, struct m3_dma *s,
                            struct snd_pcm_substream *subs)
{
        if (! s || ! subs)
                return -EINVAL;

        snd_m3_inc_timer_users(chip);
        switch (subs->stream) {
        case SNDRV_PCM_STREAM_PLAYBACK:
                chip->dacs_active++;
                snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA,
                                  s->inst.data + CDATA_INSTANCE_READY, 1);
                snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA,
                                  KDATA_MIXER_TASK_NUMBER,
                                  chip->dacs_active);
                break;
        case SNDRV_PCM_STREAM_CAPTURE:
                snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA,
                                  KDATA_ADC1_REQUEST, 1);
                snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA,
                                  s->inst.data + CDATA_INSTANCE_READY, 1);
                break;
        }
        return 0;
}

/* spinlock held! */
static int snd_m3_pcm_stop(struct snd_m3 *chip, struct m3_dma *s,
                           struct snd_pcm_substream *subs)
{
        if (! s || ! subs)
                return -EINVAL;

        snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA,
                          s->inst.data + CDATA_INSTANCE_READY, 0);
        snd_m3_dec_timer_users(chip);
        switch (subs->stream) {
        case SNDRV_PCM_STREAM_PLAYBACK:
                chip->dacs_active--;
                snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA,
                                  KDATA_MIXER_TASK_NUMBER, 
                                  chip->dacs_active);
                break;
        case SNDRV_PCM_STREAM_CAPTURE:
                snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA,
                                  KDATA_ADC1_REQUEST, 0);
                break;
        }
        return 0;
}

static int
snd_m3_pcm_trigger(struct snd_pcm_substream *subs, int cmd)
{
        struct snd_m3 *chip = snd_pcm_substream_chip(subs);
        struct m3_dma *s = subs->runtime->private_data;
        int err = -EINVAL;

        if (snd_BUG_ON(!s))
                return -ENXIO;

        spin_lock(&chip->reg_lock);
        switch (cmd) {
        case SNDRV_PCM_TRIGGER_START:
        case SNDRV_PCM_TRIGGER_RESUME:
                if (s->running)
                        err = -EBUSY;
                else {
                        s->running = 1;
                        err = snd_m3_pcm_start(chip, s, subs);
                }
                break;
        case SNDRV_PCM_TRIGGER_STOP:
        case SNDRV_PCM_TRIGGER_SUSPEND:
                if (! s->running)
                        err = 0; /* should return error? */
                else {
                        s->running = 0;
                        err = snd_m3_pcm_stop(chip, s, subs);
                }
                break;
        }
        spin_unlock(&chip->reg_lock);
        return err;
}

/*
 * setup
 */
static void 
snd_m3_pcm_setup1(struct snd_m3 *chip, struct m3_dma *s, struct snd_pcm_substream *subs)
{
        int dsp_in_size, dsp_out_size, dsp_in_buffer, dsp_out_buffer;
        struct snd_pcm_runtime *runtime = subs->runtime;

        if (subs->stream == SNDRV_PCM_STREAM_PLAYBACK) {
                dsp_in_size = MINISRC_IN_BUFFER_SIZE - (0x20 * 2);
                dsp_out_size = MINISRC_OUT_BUFFER_SIZE - (0x20 * 2);
        } else {
                dsp_in_size = MINISRC_IN_BUFFER_SIZE - (0x10 * 2);
                dsp_out_size = MINISRC_OUT_BUFFER_SIZE - (0x10 * 2);
        }
        dsp_in_buffer = s->inst.data + (MINISRC_TMP_BUFFER_SIZE / 2);
        dsp_out_buffer = dsp_in_buffer + (dsp_in_size / 2) + 1;

        s->dma_size = frames_to_bytes(runtime, runtime->buffer_size);
        s->period_size = frames_to_bytes(runtime, runtime->period_size);
        s->hwptr = 0;
        s->count = 0;

#define LO(x) ((x) & 0xffff)
#define HI(x) LO((x) >> 16)

        /* host dma buffer pointers */
        snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA,
                          s->inst.data + CDATA_HOST_SRC_ADDRL,
                          LO(s->buffer_addr));

        snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA,
                          s->inst.data + CDATA_HOST_SRC_ADDRH,
                          HI(s->buffer_addr));

        snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA,
                          s->inst.data + CDATA_HOST_SRC_END_PLUS_1L,
                          LO(s->buffer_addr + s->dma_size));

        snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA,
                          s->inst.data + CDATA_HOST_SRC_END_PLUS_1H,
                          HI(s->buffer_addr + s->dma_size));

        snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA,
                          s->inst.data + CDATA_HOST_SRC_CURRENTL,
                          LO(s->buffer_addr));

        snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA,
                          s->inst.data + CDATA_HOST_SRC_CURRENTH,
                          HI(s->buffer_addr));
#undef LO
#undef HI

        /* dsp buffers */

        snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA,
                          s->inst.data + CDATA_IN_BUF_BEGIN,
                          dsp_in_buffer);

        snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA,
                          s->inst.data + CDATA_IN_BUF_END_PLUS_1,
                          dsp_in_buffer + (dsp_in_size / 2));

        snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA,
                          s->inst.data + CDATA_IN_BUF_HEAD,
                          dsp_in_buffer);
    
        snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA,
                          s->inst.data + CDATA_IN_BUF_TAIL,
                          dsp_in_buffer);

        snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA,
                          s->inst.data + CDATA_OUT_BUF_BEGIN,
                          dsp_out_buffer);

        snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA,
                          s->inst.data + CDATA_OUT_BUF_END_PLUS_1,
                          dsp_out_buffer + (dsp_out_size / 2));

        snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA,
                          s->inst.data + CDATA_OUT_BUF_HEAD,
                          dsp_out_buffer);

        snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA,
                          s->inst.data + CDATA_OUT_BUF_TAIL,
                          dsp_out_buffer);
}

static void snd_m3_pcm_setup2(struct snd_m3 *chip, struct m3_dma *s,
                              struct snd_pcm_runtime *runtime)
{
        u32 freq;

        /* 
         * put us in the lists if we're not already there
         */
        if (! s->in_lists) {
                s->index[0] = snd_m3_add_list(chip, s->index_list[0],
                                              s->inst.data >> DP_SHIFT_COUNT);
                s->index[1] = snd_m3_add_list(chip, s->index_list[1],
                                              s->inst.data >> DP_SHIFT_COUNT);
                s->index[2] = snd_m3_add_list(chip, s->index_list[2],
                                              s->inst.data >> DP_SHIFT_COUNT);
                s->in_lists = 1;
        }

        /* write to 'mono' word */
        snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA,
                          s->inst.data + SRC3_DIRECTION_OFFSET + 1, 
                          runtime->channels == 2 ? 0 : 1);
        /* write to '8bit' word */
        snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA,
                          s->inst.data + SRC3_DIRECTION_OFFSET + 2, 
                          snd_pcm_format_width(runtime->format) == 16 ? 0 : 1);

        /* set up dac/adc rate */
        freq = DIV_ROUND_CLOSEST(runtime->rate << 15, 48000);
        if (freq) 
                freq--;

        snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA,
                          s->inst.data + CDATA_FREQUENCY,
                          freq);
}


static const struct play_vals {
        u16 addr, val;
} pv[] = {
        {CDATA_LEFT_VOLUME, ARB_VOLUME},
        {CDATA_RIGHT_VOLUME, ARB_VOLUME},
        {SRC3_DIRECTION_OFFSET, 0} ,
        /* +1, +2 are stereo/16 bit */
        {SRC3_DIRECTION_OFFSET + 3, 0x0000}, /* fraction? */
        {SRC3_DIRECTION_OFFSET + 4, 0}, /* first l */
        {SRC3_DIRECTION_OFFSET + 5, 0}, /* first r */
        {SRC3_DIRECTION_OFFSET + 6, 0}, /* second l */
        {SRC3_DIRECTION_OFFSET + 7, 0}, /* second r */
        {SRC3_DIRECTION_OFFSET + 8, 0}, /* delta l */
        {SRC3_DIRECTION_OFFSET + 9, 0}, /* delta r */
        {SRC3_DIRECTION_OFFSET + 10, 0x8000}, /* round */
        {SRC3_DIRECTION_OFFSET + 11, 0xFF00}, /* higher bute mark */
        {SRC3_DIRECTION_OFFSET + 13, 0}, /* temp0 */
        {SRC3_DIRECTION_OFFSET + 14, 0}, /* c fraction */
        {SRC3_DIRECTION_OFFSET + 15, 0}, /* counter */
        {SRC3_DIRECTION_OFFSET + 16, 8}, /* numin */
        {SRC3_DIRECTION_OFFSET + 17, 50*2}, /* numout */
        {SRC3_DIRECTION_OFFSET + 18, MINISRC_BIQUAD_STAGE - 1}, /* numstage */
        {SRC3_DIRECTION_OFFSET + 20, 0}, /* filtertap */
        {SRC3_DIRECTION_OFFSET + 21, 0} /* booster */
};


/* the mode passed should be already shifted and masked */
static void
snd_m3_playback_setup(struct snd_m3 *chip, struct m3_dma *s,
                      struct snd_pcm_substream *subs)
{
        unsigned int i;

        /*
         * some per client initializers
         */

        snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA,
                          s->inst.data + SRC3_DIRECTION_OFFSET + 12,
                          s->inst.data + 40 + 8);

        snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA,
                          s->inst.data + SRC3_DIRECTION_OFFSET + 19,
                          s->inst.code + MINISRC_COEF_LOC);

        /* enable or disable low pass filter? */
        snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA,
                          s->inst.data + SRC3_DIRECTION_OFFSET + 22,
                          subs->runtime->rate > 45000 ? 0xff : 0);
    
        /* tell it which way dma is going? */
        snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA,
                          s->inst.data + CDATA_DMA_CONTROL,
                          DMACONTROL_AUTOREPEAT + DMAC_PAGE3_SELECTOR + DMAC_BLOCKF_SELECTOR);

        /*
         * set an armload of static initializers
         */
        for (i = 0; i < ARRAY_SIZE(pv); i++) 
                snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA,
                                  s->inst.data + pv[i].addr, pv[i].val);
}

/*
 *    Native record driver 
 */
static const struct rec_vals {
        u16 addr, val;
} rv[] = {
        {CDATA_LEFT_VOLUME, ARB_VOLUME},
        {CDATA_RIGHT_VOLUME, ARB_VOLUME},
        {SRC3_DIRECTION_OFFSET, 1} ,
        /* +1, +2 are stereo/16 bit */
        {SRC3_DIRECTION_OFFSET + 3, 0x0000}, /* fraction? */
        {SRC3_DIRECTION_OFFSET + 4, 0}, /* first l */
        {SRC3_DIRECTION_OFFSET + 5, 0}, /* first r */
        {SRC3_DIRECTION_OFFSET + 6, 0}, /* second l */
        {SRC3_DIRECTION_OFFSET + 7, 0}, /* second r */
        {SRC3_DIRECTION_OFFSET + 8, 0}, /* delta l */
        {SRC3_DIRECTION_OFFSET + 9, 0}, /* delta r */
        {SRC3_DIRECTION_OFFSET + 10, 0x8000}, /* round */
        {SRC3_DIRECTION_OFFSET + 11, 0xFF00}, /* higher bute mark */
        {SRC3_DIRECTION_OFFSET + 13, 0}, /* temp0 */
        {SRC3_DIRECTION_OFFSET + 14, 0}, /* c fraction */
        {SRC3_DIRECTION_OFFSET + 15, 0}, /* counter */
        {SRC3_DIRECTION_OFFSET + 16, 50},/* numin */
        {SRC3_DIRECTION_OFFSET + 17, 8}, /* numout */
        {SRC3_DIRECTION_OFFSET + 18, 0}, /* numstage */
        {SRC3_DIRECTION_OFFSET + 19, 0}, /* coef */
        {SRC3_DIRECTION_OFFSET + 20, 0}, /* filtertap */
        {SRC3_DIRECTION_OFFSET + 21, 0}, /* booster */
        {SRC3_DIRECTION_OFFSET + 22, 0xff} /* skip lpf */
};

static void
snd_m3_capture_setup(struct snd_m3 *chip, struct m3_dma *s, struct snd_pcm_substream *subs)
{
        unsigned int i;

        /*
         * some per client initializers
         */

        snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA,
                          s->inst.data + SRC3_DIRECTION_OFFSET + 12,
                          s->inst.data + 40 + 8);

        /* tell it which way dma is going? */
        snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA,
                          s->inst.data + CDATA_DMA_CONTROL,
                          DMACONTROL_DIRECTION + DMACONTROL_AUTOREPEAT + 
                          DMAC_PAGE3_SELECTOR + DMAC_BLOCKF_SELECTOR);

        /*
         * set an armload of static initializers
         */
        for (i = 0; i < ARRAY_SIZE(rv); i++) 
                snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA,
                                  s->inst.data + rv[i].addr, rv[i].val);
}

static int snd_m3_pcm_hw_params(struct snd_pcm_substream *substream,
                                struct snd_pcm_hw_params *hw_params)
{
        struct m3_dma *s = substream->runtime->private_data;

        /* set buffer address */
        s->buffer_addr = substream->runtime->dma_addr;
        if (s->buffer_addr & 0x3) {
                dev_err(substream->pcm->card->dev, "oh my, not aligned\n");
                s->buffer_addr = s->buffer_addr & ~0x3;
        }
        return 0;
}

static int snd_m3_pcm_hw_free(struct snd_pcm_substream *substream)
{
        struct m3_dma *s;
        
        if (substream->runtime->private_data == NULL)
                return 0;
        s = substream->runtime->private_data;
        s->buffer_addr = 0;
        return 0;
}

static int
snd_m3_pcm_prepare(struct snd_pcm_substream *subs)
{
        struct snd_m3 *chip = snd_pcm_substream_chip(subs);
        struct snd_pcm_runtime *runtime = subs->runtime;
        struct m3_dma *s = runtime->private_data;

        if (snd_BUG_ON(!s))
                return -ENXIO;

        if (runtime->format != SNDRV_PCM_FORMAT_U8 &&
            runtime->format != SNDRV_PCM_FORMAT_S16_LE)
                return -EINVAL;
        if (runtime->rate > 48000 ||
            runtime->rate < 8000)
                return -EINVAL;

        spin_lock_irq(&chip->reg_lock);

        snd_m3_pcm_setup1(chip, s, subs);

        if (subs->stream == SNDRV_PCM_STREAM_PLAYBACK)
                snd_m3_playback_setup(chip, s, subs);
        else
                snd_m3_capture_setup(chip, s, subs);

        snd_m3_pcm_setup2(chip, s, runtime);

        spin_unlock_irq(&chip->reg_lock);

        return 0;
}

/*
 * get current pointer
 */
static unsigned int
snd_m3_get_pointer(struct snd_m3 *chip, struct m3_dma *s, struct snd_pcm_substream *subs)
{
        u16 hi = 0, lo = 0;
        int retry = 10;
        u32 addr;

        /*
         * try and get a valid answer
         */
        while (retry--) {
                hi =  snd_m3_assp_read(chip, MEMTYPE_INTERNAL_DATA,
                                       s->inst.data + CDATA_HOST_SRC_CURRENTH);

                lo = snd_m3_assp_read(chip, MEMTYPE_INTERNAL_DATA,
                                      s->inst.data + CDATA_HOST_SRC_CURRENTL);

                if (hi == snd_m3_assp_read(chip, MEMTYPE_INTERNAL_DATA,
                                           s->inst.data + CDATA_HOST_SRC_CURRENTH))
                        break;
        }
        addr = lo | ((u32)hi<<16);
        return (unsigned int)(addr - s->buffer_addr);
}

static snd_pcm_uframes_t
snd_m3_pcm_pointer(struct snd_pcm_substream *subs)
{
        struct snd_m3 *chip = snd_pcm_substream_chip(subs);
        unsigned int ptr;
        struct m3_dma *s = subs->runtime->private_data;

        if (snd_BUG_ON(!s))
                return 0;

        spin_lock(&chip->reg_lock);
        ptr = snd_m3_get_pointer(chip, s, subs);
        spin_unlock(&chip->reg_lock);
        return bytes_to_frames(subs->runtime, ptr);
}


/* update pointer */
/* spinlock held! */
static void snd_m3_update_ptr(struct snd_m3 *chip, struct m3_dma *s)
{
        struct snd_pcm_substream *subs = s->substream;
        unsigned int hwptr;
        int diff;

        if (! s->running)
                return;

        hwptr = snd_m3_get_pointer(chip, s, subs);

        /* try to avoid expensive modulo divisions */
        if (hwptr >= s->dma_size)
                hwptr %= s->dma_size;

        diff = s->dma_size + hwptr - s->hwptr;
        if (diff >= s->dma_size)
                diff %= s->dma_size;

        s->hwptr = hwptr;
        s->count += diff;

        if (s->count >= (signed)s->period_size) {

                if (s->count < 2 * (signed)s->period_size)
                        s->count -= (signed)s->period_size;
                else
                        s->count %= s->period_size;

                spin_unlock(&chip->reg_lock);
                snd_pcm_period_elapsed(subs);
                spin_lock(&chip->reg_lock);
        }
}

/* The m3's hardware volume works by incrementing / decrementing 2 counters
   (without wrap around) in response to volume button presses and then
   generating an interrupt. The pair of counters is stored in bits 1-3 and 5-7
   of a byte wide register. The meaning of bits 0 and 4 is unknown. */
static void snd_m3_update_hw_volume(struct work_struct *work)
{
        struct snd_m3 *chip = container_of(work, struct snd_m3, hwvol_work);
        int x, val;

        /* Figure out which volume control button was pushed,
           based on differences from the default register
           values. */
        x = inb(chip->iobase + SHADOW_MIX_REG_VOICE) & 0xee;

        /* Reset the volume counters to 4. Tests on the allegro integrated
           into a Compaq N600C laptop, have revealed that:
           1) Writing any value will result in the 2 counters being reset to
              4 so writing 0x88 is not strictly necessary
           2) Writing to any of the 4 involved registers will reset all 4
              of them (and reading them always returns the same value for all
              of them)
           It could be that a maestro deviates from this, so leave the code
           as is. */
        outb(0x88, chip->iobase + SHADOW_MIX_REG_VOICE);
        outb(0x88, chip->iobase + HW_VOL_COUNTER_VOICE);
        outb(0x88, chip->iobase + SHADOW_MIX_REG_MASTER);
        outb(0x88, chip->iobase + HW_VOL_COUNTER_MASTER);

        /* Ignore spurious HV interrupts during suspend / resume, this avoids
           mistaking them for a mute button press. */
        if (chip->in_suspend)
                return;

#ifndef CONFIG_SND_MAESTRO3_INPUT
        if (!chip->master_switch || !chip->master_volume)
                return;

        val = snd_ac97_read(chip->ac97, AC97_MASTER);
        switch (x) {
        case 0x88:
                /* The counters have not changed, yet we've received a HV
                   interrupt. According to tests run by various people this
                   happens when pressing the mute button. */
                val ^= 0x8000;
                break;
        case 0xaa:
                /* counters increased by 1 -> volume up */
                if ((val & 0x7f) > 0)
                        val--;
                if ((val & 0x7f00) > 0)
                        val -= 0x0100;
                break;
        case 0x66:
                /* counters decreased by 1 -> volume down */
                if ((val & 0x7f) < 0x1f)
                        val++;
                if ((val & 0x7f00) < 0x1f00)
                        val += 0x0100;
                break;
        }
        if (snd_ac97_update(chip->ac97, AC97_MASTER, val))
                snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
                               &chip->master_switch->id);
#else
        if (!chip->input_dev)
                return;

        val = 0;
        switch (x) {
        case 0x88:
                /* The counters have not changed, yet we've received a HV
                   interrupt. According to tests run by various people this
                   happens when pressing the mute button. */
                val = KEY_MUTE;
                break;
        case 0xaa:
                /* counters increased by 1 -> volume up */
                val = KEY_VOLUMEUP;
                break;
        case 0x66:
                /* counters decreased by 1 -> volume down */
                val = KEY_VOLUMEDOWN;
                break;
        }

        if (val) {
                input_report_key(chip->input_dev, val, 1);
                input_sync(chip->input_dev);
                input_report_key(chip->input_dev, val, 0);
                input_sync(chip->input_dev);
        }
#endif
}

static irqreturn_t snd_m3_interrupt(int irq, void *dev_id)
{
        struct snd_m3 *chip = dev_id;
        u8 status;
        int i;

        status = inb(chip->iobase + HOST_INT_STATUS);

        if (status == 0xff)
                return IRQ_NONE;

        if (status & HV_INT_PENDING)
                schedule_work(&chip->hwvol_work);

        /*
         * ack an assp int if its running
         * and has an int pending
         */
        if (status & ASSP_INT_PENDING) {
                u8 ctl = inb(chip->iobase + ASSP_CONTROL_B);
                if (!(ctl & STOP_ASSP_CLOCK)) {
                        ctl = inb(chip->iobase + ASSP_HOST_INT_STATUS);
                        if (ctl & DSP2HOST_REQ_TIMER) {
                                outb(DSP2HOST_REQ_TIMER, chip->iobase + ASSP_HOST_INT_STATUS);
                                /* update adc/dac info if it was a timer int */
                                spin_lock(&chip->reg_lock);
                                for (i = 0; i < chip->num_substreams; i++) {
                                        struct m3_dma *s = &chip->substreams[i];
                                        if (s->running)
                                                snd_m3_update_ptr(chip, s);
                                }
                                spin_unlock(&chip->reg_lock);
                        }
                }
        }

#if 0 /* TODO: not supported yet */
        if ((status & MPU401_INT_PENDING) && chip->rmidi)
                snd_mpu401_uart_interrupt(irq, chip->rmidi->private_data, regs);
#endif

        /* ack ints */
        outb(status, chip->iobase + HOST_INT_STATUS);

        return IRQ_HANDLED;
}


/*
 */

static const struct snd_pcm_hardware snd_m3_playback =
{
        .info =                 (SNDRV_PCM_INFO_MMAP |
                                 SNDRV_PCM_INFO_INTERLEAVED |
                                 SNDRV_PCM_INFO_MMAP_VALID |
                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
                                 /*SNDRV_PCM_INFO_PAUSE |*/
                                 SNDRV_PCM_INFO_RESUME),
        .formats =              SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE,
        .rates =                SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
        .rate_min =             8000,
        .rate_max =             48000,
        .channels_min =         1,
        .channels_max =         2,
        .buffer_bytes_max =     (512*1024),
        .period_bytes_min =     64,
        .period_bytes_max =     (512*1024),
        .periods_min =          1,
        .periods_max =          1024,
};

static const struct snd_pcm_hardware snd_m3_capture =
{
        .info =                 (SNDRV_PCM_INFO_MMAP |
                                 SNDRV_PCM_INFO_INTERLEAVED |
                                 SNDRV_PCM_INFO_MMAP_VALID |
                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
                                 /*SNDRV_PCM_INFO_PAUSE |*/
                                 SNDRV_PCM_INFO_RESUME),
        .formats =              SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE,
        .rates =                SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
        .rate_min =             8000,
        .rate_max =             48000,
        .channels_min =         1,
        .channels_max =         2,
        .buffer_bytes_max =     (512*1024),
        .period_bytes_min =     64,
        .period_bytes_max =     (512*1024),
        .periods_min =          1,
        .periods_max =          1024,
};


/*
 */

static int
snd_m3_substream_open(struct snd_m3 *chip, struct snd_pcm_substream *subs)
{
        int i;
        struct m3_dma *s;

        spin_lock_irq(&chip->reg_lock);
        for (i = 0; i < chip->num_substreams; i++) {
                s = &chip->substreams[i];
                if (! s->opened)
                        goto __found;
        }
        spin_unlock_irq(&chip->reg_lock);
        return -ENOMEM;
__found:
        s->opened = 1;
        s->running = 0;
        spin_unlock_irq(&chip->reg_lock);

        subs->runtime->private_data = s;
        s->substream = subs;

        /* set list owners */
        if (subs->stream == SNDRV_PCM_STREAM_PLAYBACK) {
                s->index_list[0] = &chip->mixer_list;
        } else
                s->index_list[0] = &chip->adc1_list;
        s->index_list[1] = &chip->msrc_list;
        s->index_list[2] = &chip->dma_list;

        return 0;
}

static void
snd_m3_substream_close(struct snd_m3 *chip, struct snd_pcm_substream *subs)
{
        struct m3_dma *s = subs->runtime->private_data;

        if (s == NULL)
                return; /* not opened properly */

        spin_lock_irq(&chip->reg_lock);
        if (s->substream && s->running)
                snd_m3_pcm_stop(chip, s, s->substream); /* does this happen? */
        if (s->in_lists) {
                snd_m3_remove_list(chip, s->index_list[0], s->index[0]);
                snd_m3_remove_list(chip, s->index_list[1], s->index[1]);
                snd_m3_remove_list(chip, s->index_list[2], s->index[2]);
                s->in_lists = 0;
        }
        s->running = 0;
        s->opened = 0;
        spin_unlock_irq(&chip->reg_lock);
}

static int
snd_m3_playback_open(struct snd_pcm_substream *subs)
{
        struct snd_m3 *chip = snd_pcm_substream_chip(subs);
        struct snd_pcm_runtime *runtime = subs->runtime;
        int err;

        err = snd_m3_substream_open(chip, subs);
        if (err < 0)
                return err;

        runtime->hw = snd_m3_playback;

        return 0;
}

static int
snd_m3_playback_close(struct snd_pcm_substream *subs)
{
        struct snd_m3 *chip = snd_pcm_substream_chip(subs);

        snd_m3_substream_close(chip, subs);
        return 0;
}

static int
snd_m3_capture_open(struct snd_pcm_substream *subs)
{
        struct snd_m3 *chip = snd_pcm_substream_chip(subs);
        struct snd_pcm_runtime *runtime = subs->runtime;
        int err;

        err = snd_m3_substream_open(chip, subs);
        if (err < 0)
                return err;

        runtime->hw = snd_m3_capture;

        return 0;
}

static int
snd_m3_capture_close(struct snd_pcm_substream *subs)
{
        struct snd_m3 *chip = snd_pcm_substream_chip(subs);

        snd_m3_substream_close(chip, subs);
        return 0;
}

/*
 * create pcm instance
 */

static const struct snd_pcm_ops snd_m3_playback_ops = {
        .open =         snd_m3_playback_open,
        .close =        snd_m3_playback_close,
        .hw_params =    snd_m3_pcm_hw_params,
        .hw_free =      snd_m3_pcm_hw_free,
        .prepare =      snd_m3_pcm_prepare,
        .trigger =      snd_m3_pcm_trigger,
        .pointer =      snd_m3_pcm_pointer,
};

static const struct snd_pcm_ops snd_m3_capture_ops = {
        .open =         snd_m3_capture_open,
        .close =        snd_m3_capture_close,
        .hw_params =    snd_m3_pcm_hw_params,
        .hw_free =      snd_m3_pcm_hw_free,
        .prepare =      snd_m3_pcm_prepare,
        .trigger =      snd_m3_pcm_trigger,
        .pointer =      snd_m3_pcm_pointer,
};

static int
snd_m3_pcm(struct snd_m3 * chip, int device)
{
        struct snd_pcm *pcm;
        int err;

        err = snd_pcm_new(chip->card, chip->card->driver, device,
                          MAX_PLAYBACKS, MAX_CAPTURES, &pcm);
        if (err < 0)
                return err;

        snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_m3_playback_ops);
        snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_m3_capture_ops);

        pcm->private_data = chip;
        pcm->info_flags = 0;
        strcpy(pcm->name, chip->card->driver);
        chip->pcm = pcm;
        
        snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV,
                                       &chip->pci->dev, 64*1024, 64*1024);

        return 0;
}


/*
 * ac97 interface
 */

/*
 * Wait for the ac97 serial bus to be free.
 * return nonzero if the bus is still busy.
 */
static int snd_m3_ac97_wait(struct snd_m3 *chip)
{
        int i = 10000;

        do {
                if (! (snd_m3_inb(chip, 0x30) & 1))
                        return 0;
                cpu_relax();
        } while (i-- > 0);

        dev_err(chip->card->dev, "ac97 serial bus busy\n");
        return 1;
}

static unsigned short
snd_m3_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
{
        struct snd_m3 *chip = ac97->private_data;
        unsigned short data = 0xffff;

        if (snd_m3_ac97_wait(chip))
                goto fail;
        snd_m3_outb(chip, 0x80 | (reg & 0x7f), CODEC_COMMAND);
        if (snd_m3_ac97_wait(chip))
                goto fail;
        data = snd_m3_inw(chip, CODEC_DATA);
fail:
        return data;
}

static void
snd_m3_ac97_write(struct snd_ac97 *ac97, unsigned short reg, unsigned short val)
{
        struct snd_m3 *chip = ac97->private_data;

        if (snd_m3_ac97_wait(chip))
                return;
        snd_m3_outw(chip, val, CODEC_DATA);
        snd_m3_outb(chip, reg & 0x7f, CODEC_COMMAND);
        /*
         * Workaround for buggy ES1988 integrated AC'97 codec. It remains silent
         * until the MASTER volume or mute is touched (alsactl restore does not
         * work).
         */
        if (ac97->id == 0x45838308 && reg == AC97_MASTER) {
                snd_m3_ac97_wait(chip);
                snd_m3_outw(chip, val, CODEC_DATA);
                snd_m3_outb(chip, reg & 0x7f, CODEC_COMMAND);
        }
}


static void snd_m3_remote_codec_config(struct snd_m3 *chip, int isremote)
{
        int io = chip->iobase;
        u16 tmp;

        isremote = isremote ? 1 : 0;

        tmp = inw(io + RING_BUS_CTRL_B) & ~SECOND_CODEC_ID_MASK;
        /* enable dock on Dell Latitude C810 */
        if (chip->pci->subsystem_vendor == 0x1028 &&
            chip->pci->subsystem_device == 0x00e5)
                tmp |= M3I_DOCK_ENABLE;
        outw(tmp | isremote, io + RING_BUS_CTRL_B);
        outw((inw(io + SDO_OUT_DEST_CTRL) & ~COMMAND_ADDR_OUT) | isremote,
             io + SDO_OUT_DEST_CTRL);
        outw((inw(io + SDO_IN_DEST_CTRL) & ~STATUS_ADDR_IN) | isremote,
             io + SDO_IN_DEST_CTRL);
}

/* 
 * hack, returns non zero on err 
 */
static int snd_m3_try_read_vendor(struct snd_m3 *chip)
{
        u16 ret;

        if (snd_m3_ac97_wait(chip))
                return 1;

        snd_m3_outb(chip, 0x80 | (AC97_VENDOR_ID1 & 0x7f), 0x30);

        if (snd_m3_ac97_wait(chip))
                return 1;

        ret = snd_m3_inw(chip, 0x32);

        return (ret == 0) || (ret == 0xffff);
}

static void snd_m3_ac97_reset(struct snd_m3 *chip)
{
        u16 dir;
        int delay1 = 0, delay2 = 0, i;
        int io = chip->iobase;

        if (chip->allegro_flag) {
                /*
                 * the onboard codec on the allegro seems 
                 * to want to wait a very long time before
                 * coming back to life 
                 */
                delay1 = 50;
                delay2 = 800;
        } else {
                /* maestro3 */
                delay1 = 20;
                delay2 = 500;
        }

        for (i = 0; i < 5; i++) {
                dir = inw(io + GPIO_DIRECTION);
                if (!chip->irda_workaround)
                        dir |= 0x10; /* assuming pci bus master? */

                snd_m3_remote_codec_config(chip, 0);

                outw(IO_SRAM_ENABLE, io + RING_BUS_CTRL_A);
                udelay(20);

                outw(dir & ~GPO_PRIMARY_AC97 , io + GPIO_DIRECTION);
                outw(~GPO_PRIMARY_AC97 , io + GPIO_MASK);
                outw(0, io + GPIO_DATA);
                outw(dir | GPO_PRIMARY_AC97, io + GPIO_DIRECTION);

                schedule_timeout_uninterruptible(msecs_to_jiffies(delay1));

                outw(GPO_PRIMARY_AC97, io + GPIO_DATA);
                udelay(5);
                /* ok, bring back the ac-link */
                outw(IO_SRAM_ENABLE | SERIAL_AC_LINK_ENABLE, io + RING_BUS_CTRL_A);

                outw(~0, io + GPIO_MASK);

                schedule_timeout_uninterruptible(msecs_to_jiffies(delay2));

                if (! snd_m3_try_read_vendor(chip))
                        break;

                delay1 += 10;
                delay2 += 100;

                dev_dbg(chip->card->dev,
                        "retrying codec reset with delays of %d and %d ms\n",
                           delay1, delay2);
        }

#if 0
        /* more gung-ho reset that doesn't
         * seem to work anywhere :)
         */
        tmp = inw(io + RING_BUS_CTRL_A);
        outw(RAC_SDFS_ENABLE|LAC_SDFS_ENABLE, io + RING_BUS_CTRL_A);
        msleep(20);
        outw(tmp, io + RING_BUS_CTRL_A);
        msleep(50);
#endif
}

static int snd_m3_mixer(struct snd_m3 *chip)
{
        struct snd_ac97_bus *pbus;
        struct snd_ac97_template ac97;
#ifndef CONFIG_SND_MAESTRO3_INPUT
        struct snd_ctl_elem_id elem_id;
#endif
        int err;
        static const struct snd_ac97_bus_ops ops = {
                .write = snd_m3_ac97_write,
                .read = snd_m3_ac97_read,
        };

        err = snd_ac97_bus(chip->card, 0, &ops, NULL, &pbus);
        if (err < 0)
                return err;
        
        memset(&ac97, 0, sizeof(ac97));
        ac97.private_data = chip;
        err = snd_ac97_mixer(pbus, &ac97, &chip->ac97);
        if (err < 0)
                return err;

        /* seems ac97 PCM needs initialization.. hack hack.. */
        snd_ac97_write(chip->ac97, AC97_PCM, 0x8000 | (15 << 8) | 15);
        schedule_timeout_uninterruptible(msecs_to_jiffies(100));
        snd_ac97_write(chip->ac97, AC97_PCM, 0);

#ifndef CONFIG_SND_MAESTRO3_INPUT
        memset(&elem_id, 0, sizeof(elem_id));
        elem_id.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
        strcpy(elem_id.name, "Master Playback Switch");
        chip->master_switch = snd_ctl_find_id(chip->card, &elem_id);
        memset(&elem_id, 0, sizeof(elem_id));
        elem_id.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
        strcpy(elem_id.name, "Master Playback Volume");
        chip->master_volume = snd_ctl_find_id(chip->card, &elem_id);
#endif

        return 0;
}


/*
 * initialize ASSP
 */

#define MINISRC_LPF_LEN 10
static const u16 minisrc_lpf[MINISRC_LPF_LEN] = {
        0X0743, 0X1104, 0X0A4C, 0XF88D, 0X242C,
        0X1023, 0X1AA9, 0X0B60, 0XEFDD, 0X186F
};

static void snd_m3_assp_init(struct snd_m3 *chip)
{
        unsigned int i;
        const __le16 *data;

        /* zero kernel data */
        for (i = 0; i < (REV_B_DATA_MEMORY_UNIT_LENGTH * NUM_UNITS_KERNEL_DATA) / 2; i++)
                snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA, 
                                  KDATA_BASE_ADDR + i, 0);

        /* zero mixer data? */
        for (i = 0; i < (REV_B_DATA_MEMORY_UNIT_LENGTH * NUM_UNITS_KERNEL_DATA) / 2; i++)
                snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA,
                                  KDATA_BASE_ADDR2 + i, 0);

        /* init dma pointer */
        snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA,
                          KDATA_CURRENT_DMA,
                          KDATA_DMA_XFER0);

        /* write kernel into code memory.. */
        data = (const __le16 *)chip->assp_kernel_image->data;
        for (i = 0 ; i * 2 < chip->assp_kernel_image->size; i++) {
                snd_m3_assp_write(chip, MEMTYPE_INTERNAL_CODE, 
                                  REV_B_CODE_MEMORY_BEGIN + i,
                                  le16_to_cpu(data[i]));
        }

        /*
         * We only have this one client and we know that 0x400
         * is free in our kernel's mem map, so lets just
         * drop it there.  It seems that the minisrc doesn't
         * need vectors, so we won't bother with them..
         */
        data = (const __le16 *)chip->assp_minisrc_image->data;
        for (i = 0; i * 2 < chip->assp_minisrc_image->size; i++) {
                snd_m3_assp_write(chip, MEMTYPE_INTERNAL_CODE, 
                                  0x400 + i, le16_to_cpu(data[i]));
        }

        /*
         * write the coefficients for the low pass filter?
         */
        for (i = 0; i < MINISRC_LPF_LEN ; i++) {
                snd_m3_assp_write(chip, MEMTYPE_INTERNAL_CODE,
                                  0x400 + MINISRC_COEF_LOC + i,
                                  minisrc_lpf[i]);
        }

        snd_m3_assp_write(chip, MEMTYPE_INTERNAL_CODE,
                          0x400 + MINISRC_COEF_LOC + MINISRC_LPF_LEN,
                          0x8000);

        /*
         * the minisrc is the only thing on
         * our task list..
         */
        snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA, 
                          KDATA_TASK0,
                          0x400);

        /*
         * init the mixer number..
         */

        snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA,
                          KDATA_MIXER_TASK_NUMBER,0);

        /*
         * EXTREME KERNEL MASTER VOLUME
         */
        snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA,
                          KDATA_DAC_LEFT_VOLUME, ARB_VOLUME);
        snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA,
                          KDATA_DAC_RIGHT_VOLUME, ARB_VOLUME);

        chip->mixer_list.curlen = 0;
        chip->mixer_list.mem_addr = KDATA_MIXER_XFER0;
        chip->mixer_list.max = MAX_VIRTUAL_MIXER_CHANNELS;
        chip->adc1_list.curlen = 0;
        chip->adc1_list.mem_addr = KDATA_ADC1_XFER0;
        chip->adc1_list.max = MAX_VIRTUAL_ADC1_CHANNELS;
        chip->dma_list.curlen = 0;
        chip->dma_list.mem_addr = KDATA_DMA_XFER0;
        chip->dma_list.max = MAX_VIRTUAL_DMA_CHANNELS;
        chip->msrc_list.curlen = 0;
        chip->msrc_list.mem_addr = KDATA_INSTANCE0_MINISRC;
        chip->msrc_list.max = MAX_INSTANCE_MINISRC;
}


static int snd_m3_assp_client_init(struct snd_m3 *chip, struct m3_dma *s, int index)
{
        int data_bytes = 2 * ( MINISRC_TMP_BUFFER_SIZE / 2 + 
                               MINISRC_IN_BUFFER_SIZE / 2 +
                               1 + MINISRC_OUT_BUFFER_SIZE / 2 + 1 );
        int address, i;

        /*
         * the revb memory map has 0x1100 through 0x1c00
         * free.  
         */

        /*
         * align instance address to 256 bytes so that its
         * shifted list address is aligned.
         * list address = (mem address >> 1) >> 7;
         */
        data_bytes = ALIGN(data_bytes, 256);
        address = 0x1100 + ((data_bytes/2) * index);

        if ((address + (data_bytes/2)) >= 0x1c00) {
                dev_err(chip->card->dev,
                        "no memory for %d bytes at ind %d (addr 0x%x)\n",
                           data_bytes, index, address);
                return -ENOMEM;
        }

        s->number = index;
        s->inst.code = 0x400;
        s->inst.data = address;

        for (i = data_bytes / 2; i > 0; address++, i--) {
                snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA,
                                  address, 0);
        }

        return 0;
}


/* 
 * this works for the reference board, have to find
 * out about others
 *
 * this needs more magic for 4 speaker, but..
 */
static void
snd_m3_amp_enable(struct snd_m3 *chip, int enable)
{
        int io = chip->iobase;
        u16 gpo, polarity;

        if (! chip->external_amp)
                return;

        polarity = enable ? 0 : 1;
        polarity = polarity << chip->amp_gpio;
        gpo = 1 << chip->amp_gpio;

        outw(~gpo, io + GPIO_MASK);

        outw(inw(io + GPIO_DIRECTION) | gpo,
             io + GPIO_DIRECTION);

        outw((GPO_SECONDARY_AC97 | GPO_PRIMARY_AC97 | polarity),
             io + GPIO_DATA);

        outw(0xffff, io + GPIO_MASK);
}

static void
snd_m3_hv_init(struct snd_m3 *chip)
{
        unsigned long io = chip->iobase;
        u16 val = GPI_VOL_DOWN | GPI_VOL_UP;

        if (!chip->is_omnibook)
                return;

        /*
         * Volume buttons on some HP OmniBook laptops
         * require some GPIO magic to work correctly.
         */
        outw(0xffff, io + GPIO_MASK);
        outw(0x0000, io + GPIO_DATA);

        outw(~val, io + GPIO_MASK);
        outw(inw(io + GPIO_DIRECTION) & ~val, io + GPIO_DIRECTION);
        outw(val, io + GPIO_MASK);

        outw(0xffff, io + GPIO_MASK);
}

static int
snd_m3_chip_init(struct snd_m3 *chip)
{
        struct pci_dev *pcidev = chip->pci;
        unsigned long io = chip->iobase;
        u32 n;
        u16 w;
        u8 t; /* makes as much sense as 'n', no? */

        pci_read_config_word(pcidev, PCI_LEGACY_AUDIO_CTRL, &w);
        w &= ~(SOUND_BLASTER_ENABLE|FM_SYNTHESIS_ENABLE|
               MPU401_IO_ENABLE|MPU401_IRQ_ENABLE|ALIAS_10BIT_IO|
               DISABLE_LEGACY);
        pci_write_config_word(pcidev, PCI_LEGACY_AUDIO_CTRL, w);

        pci_read_config_dword(pcidev, PCI_ALLEGRO_CONFIG, &n);
        n &= ~(HV_CTRL_ENABLE | REDUCED_DEBOUNCE | HV_BUTTON_FROM_GD);
        n |= chip->hv_config;
        /* For some reason we must always use reduced debounce. */
        n |= REDUCED_DEBOUNCE;
        n |= PM_CTRL_ENABLE | CLK_DIV_BY_49 | USE_PCI_TIMING;
        pci_write_config_dword(pcidev, PCI_ALLEGRO_CONFIG, n);

        outb(RESET_ASSP, chip->iobase + ASSP_CONTROL_B);
        pci_read_config_dword(pcidev, PCI_ALLEGRO_CONFIG, &n);
        n &= ~INT_CLK_SELECT;
        if (!chip->allegro_flag) {
                n &= ~INT_CLK_MULT_ENABLE; 
                n |= INT_CLK_SRC_NOT_PCI;
        }
        n &=  ~( CLK_MULT_MODE_SELECT | CLK_MULT_MODE_SELECT_2 );
        pci_write_config_dword(pcidev, PCI_ALLEGRO_CONFIG, n);

        if (chip->allegro_flag) {
                pci_read_config_dword(pcidev, PCI_USER_CONFIG, &n);
                n |= IN_CLK_12MHZ_SELECT;
                pci_write_config_dword(pcidev, PCI_USER_CONFIG, n);
        }

        t = inb(chip->iobase + ASSP_CONTROL_A);
        t &= ~( DSP_CLK_36MHZ_SELECT  | ASSP_CLK_49MHZ_SELECT);
        t |= ASSP_CLK_49MHZ_SELECT;
        t |= ASSP_0_WS_ENABLE; 
        outb(t, chip->iobase + ASSP_CONTROL_A);

        snd_m3_assp_init(chip); /* download DSP code before starting ASSP below */
        outb(RUN_ASSP, chip->iobase + ASSP_CONTROL_B); 

        outb(0x00, io + HARDWARE_VOL_CTRL);
        outb(0x88, io + SHADOW_MIX_REG_VOICE);
        outb(0x88, io + HW_VOL_COUNTER_VOICE);
        outb(0x88, io + SHADOW_MIX_REG_MASTER);
        outb(0x88, io + HW_VOL_COUNTER_MASTER);

        return 0;
} 

static void
snd_m3_enable_ints(struct snd_m3 *chip)
{
        unsigned long io = chip->iobase;
        unsigned short val;

        /* TODO: MPU401 not supported yet */
        val = ASSP_INT_ENABLE /*| MPU401_INT_ENABLE*/;
        if (chip->hv_config & HV_CTRL_ENABLE)
                val |= HV_INT_ENABLE;
        outb(val, chip->iobase + HOST_INT_STATUS);
        outw(val, io + HOST_INT_CTRL);
        outb(inb(io + ASSP_CONTROL_C) | ASSP_HOST_INT_ENABLE,
             io + ASSP_CONTROL_C);
}


/*
 */

static int snd_m3_free(struct snd_m3 *chip)
{
        struct m3_dma *s;
        int i;

        cancel_work_sync(&chip->hwvol_work);
#ifdef CONFIG_SND_MAESTRO3_INPUT
        if (chip->input_dev)
                input_unregister_device(chip->input_dev);
#endif

        if (chip->substreams) {
                spin_lock_irq(&chip->reg_lock);
                for (i = 0; i < chip->num_substreams; i++) {
                        s = &chip->substreams[i];
                        /* check surviving pcms; this should not happen though.. */
                        if (s->substream && s->running)
                                snd_m3_pcm_stop(chip, s, s->substream);
                }
                spin_unlock_irq(&chip->reg_lock);
                kfree(chip->substreams);
        }
        if (chip->iobase) {
                outw(0, chip->iobase + HOST_INT_CTRL); /* disable ints */
        }

#ifdef CONFIG_PM_SLEEP
        vfree(chip->suspend_mem);
#endif

        if (chip->irq >= 0)
                free_irq(chip->irq, chip);

        if (chip->iobase)
                pci_release_regions(chip->pci);

        release_firmware(chip->assp_kernel_image);
        release_firmware(chip->assp_minisrc_image);

        pci_disable_device(chip->pci);
        kfree(chip);
        return 0;
}


/*
 * APM support
 */
#ifdef CONFIG_PM_SLEEP
static int m3_suspend(struct device *dev)
{
        struct snd_card *card = dev_get_drvdata(dev);
        struct snd_m3 *chip = card->private_data;
        int i, dsp_index;

        if (chip->suspend_mem == NULL)
                return 0;

        chip->in_suspend = 1;
        cancel_work_sync(&chip->hwvol_work);
        snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
        snd_ac97_suspend(chip->ac97);

        msleep(10); /* give the assp a chance to idle.. */

        snd_m3_assp_halt(chip);

        /* save dsp image */
        dsp_index = 0;
        for (i = REV_B_CODE_MEMORY_BEGIN; i <= REV_B_CODE_MEMORY_END; i++)
                chip->suspend_mem[dsp_index++] =
                        snd_m3_assp_read(chip, MEMTYPE_INTERNAL_CODE, i);
        for (i = REV_B_DATA_MEMORY_BEGIN ; i <= REV_B_DATA_MEMORY_END; i++)
                chip->suspend_mem[dsp_index++] =
                        snd_m3_assp_read(chip, MEMTYPE_INTERNAL_DATA, i);
        return 0;
}

static int m3_resume(struct device *dev)
{
        struct snd_card *card = dev_get_drvdata(dev);
        struct snd_m3 *chip = card->private_data;
        int i, dsp_index;

        if (chip->suspend_mem == NULL)
                return 0;

        /* first lets just bring everything back. .*/
        snd_m3_outw(chip, 0, 0x54);
        snd_m3_outw(chip, 0, 0x56);

        snd_m3_chip_init(chip);
        snd_m3_assp_halt(chip);
        snd_m3_ac97_reset(chip);

        /* restore dsp image */
        dsp_index = 0;
        for (i = REV_B_CODE_MEMORY_BEGIN; i <= REV_B_CODE_MEMORY_END; i++)
                snd_m3_assp_write(chip, MEMTYPE_INTERNAL_CODE, i, 
                                  chip->suspend_mem[dsp_index++]);
        for (i = REV_B_DATA_MEMORY_BEGIN ; i <= REV_B_DATA_MEMORY_END; i++)
                snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA, i, 
                                  chip->suspend_mem[dsp_index++]);

        /* tell the dma engine to restart itself */
        snd_m3_assp_write(chip, MEMTYPE_INTERNAL_DATA, 
                          KDATA_DMA_ACTIVE, 0);

        /* restore ac97 registers */
        snd_ac97_resume(chip->ac97);

        snd_m3_assp_continue(chip);
        snd_m3_enable_ints(chip);
        snd_m3_amp_enable(chip, 1);

        snd_m3_hv_init(chip);

        snd_power_change_state(card, SNDRV_CTL_POWER_D0);
        chip->in_suspend = 0;
        return 0;
}

static SIMPLE_DEV_PM_OPS(m3_pm, m3_suspend, m3_resume);
#define M3_PM_OPS       &m3_pm
#else
#define M3_PM_OPS       NULL
#endif /* CONFIG_PM_SLEEP */

#ifdef CONFIG_SND_MAESTRO3_INPUT
static int snd_m3_input_register(struct snd_m3 *chip)
{
        struct input_dev *input_dev;
        int err;

        input_dev = input_allocate_device();
        if (!input_dev)
                return -ENOMEM;

        snprintf(chip->phys, sizeof(chip->phys), "pci-%s/input0",
                 pci_name(chip->pci));

        input_dev->name = chip->card->driver;
        input_dev->phys = chip->phys;
        input_dev->id.bustype = BUS_PCI;
        input_dev->id.vendor  = chip->pci->vendor;
        input_dev->id.product = chip->pci->device;
        input_dev->dev.parent = &chip->pci->dev;

        __set_bit(EV_KEY, input_dev->evbit);
        __set_bit(KEY_MUTE, input_dev->keybit);
        __set_bit(KEY_VOLUMEDOWN, input_dev->keybit);
        __set_bit(KEY_VOLUMEUP, input_dev->keybit);

        err = input_register_device(input_dev);
        if (err) {
                input_free_device(input_dev);
                return err;
        }

        chip->input_dev = input_dev;
        return 0;
}
#endif /* CONFIG_INPUT */

/*
 */

static int snd_m3_dev_free(struct snd_device *device)
{
        struct snd_m3 *chip = device->device_data;
        return snd_m3_free(chip);
}

static int
snd_m3_create(struct snd_card *card, struct pci_dev *pci,
              int enable_amp,
              int amp_gpio,
              struct snd_m3 **chip_ret)
{
        struct snd_m3 *chip;
        int i, err;
        const struct snd_pci_quirk *quirk;
        static const struct snd_device_ops ops = {
                .dev_free =     snd_m3_dev_free,
        };

        *chip_ret = NULL;

        if (pci_enable_device(pci))
                return -EIO;

        /* check, if we can restrict PCI DMA transfers to 28 bits */
        if (dma_set_mask_and_coherent(&pci->dev, DMA_BIT_MASK(28))) {
                dev_err(card->dev,
                        "architecture does not support 28bit PCI busmaster DMA\n");
                pci_disable_device(pci);
                return -ENXIO;
        }

        chip = kzalloc(sizeof(*chip), GFP_KERNEL);
        if (chip == NULL) {
                pci_disable_device(pci);
                return -ENOMEM;
        }

        spin_lock_init(&chip->reg_lock);

        switch (pci->device) {
        case PCI_DEVICE_ID_ESS_ALLEGRO:
        case PCI_DEVICE_ID_ESS_ALLEGRO_1:
        case PCI_DEVICE_ID_ESS_CANYON3D_2LE:
        case PCI_DEVICE_ID_ESS_CANYON3D_2:
                chip->allegro_flag = 1;
                break;
        }

        chip->card = card;
        chip->pci = pci;
        chip->irq = -1;
        INIT_WORK(&chip->hwvol_work, snd_m3_update_hw_volume);

        chip->external_amp = enable_amp;
        if (amp_gpio >= 0 && amp_gpio <= 0x0f)
                chip->amp_gpio = amp_gpio;
        else {
                quirk = snd_pci_quirk_lookup(pci, m3_amp_quirk_list);
                if (quirk) {
                        dev_info(card->dev, "set amp-gpio for '%s'\n",
                                 snd_pci_quirk_name(quirk));
                        chip->amp_gpio = quirk->value;
                } else if (chip->allegro_flag)
                        chip->amp_gpio = GPO_EXT_AMP_ALLEGRO;
                else /* presumably this is for all 'maestro3's.. */
                        chip->amp_gpio = GPO_EXT_AMP_M3;
        }

        quirk = snd_pci_quirk_lookup(pci, m3_irda_quirk_list);
        if (quirk) {
                dev_info(card->dev, "enabled irda workaround for '%s'\n",
                         snd_pci_quirk_name(quirk));
                chip->irda_workaround = 1;
        }
        quirk = snd_pci_quirk_lookup(pci, m3_hv_quirk_list);
        if (quirk)
                chip->hv_config = quirk->value;
        if (snd_pci_quirk_lookup(pci, m3_omnibook_quirk_list))
                chip->is_omnibook = 1;

        chip->num_substreams = NR_DSPS;
        chip->substreams = kcalloc(chip->num_substreams, sizeof(struct m3_dma),
                                   GFP_KERNEL);
        if (chip->substreams == NULL) {
                kfree(chip);
                pci_disable_device(pci);
                return -ENOMEM;
        }

        err = request_firmware(&chip->assp_kernel_image,
                               "ess/maestro3_assp_kernel.fw", &pci->dev);
        if (err < 0)
                goto free_chip;

        err = request_firmware(&chip->assp_minisrc_image,
                               "ess/maestro3_assp_minisrc.fw", &pci->dev);
        if (err < 0)
                goto free_chip;

        err = pci_request_regions(pci, card->driver);
        if (err < 0)
                goto free_chip;

        chip->iobase = pci_resource_start(pci, 0);
        
        /* just to be sure */
        pci_set_master(pci);

        snd_m3_chip_init(chip);
        snd_m3_assp_halt(chip);

        snd_m3_ac97_reset(chip);

        snd_m3_amp_enable(chip, 1);

        snd_m3_hv_init(chip);

        if (request_irq(pci->irq, snd_m3_interrupt, IRQF_SHARED,
                        KBUILD_MODNAME, chip)) {
                dev_err(card->dev, "unable to grab IRQ %d\n", pci->irq);
                err = -ENOMEM;
                goto free_chip;
        }
        chip->irq = pci->irq;
        card->sync_irq = chip->irq;

#ifdef CONFIG_PM_SLEEP
        chip->suspend_mem =
                vmalloc(array_size(sizeof(u16),
                                   REV_B_CODE_MEMORY_LENGTH +
                                        REV_B_DATA_MEMORY_LENGTH));
        if (chip->suspend_mem == NULL)
                dev_warn(card->dev, "can't allocate apm buffer\n");
#endif

        err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
        if (err < 0)
                goto free_chip;

        err = snd_m3_mixer(chip);
        if (err < 0)
                return err;

        for (i = 0; i < chip->num_substreams; i++) {
                struct m3_dma *s = &chip->substreams[i];
                err = snd_m3_assp_client_init(chip, s, i);
                if (err < 0)
                        return err;
        }

        err = snd_m3_pcm(chip, 0);
        if (err < 0)
                return err;

#ifdef CONFIG_SND_MAESTRO3_INPUT
        if (chip->hv_config & HV_CTRL_ENABLE) {
                err = snd_m3_input_register(chip);
                if (err)
                        dev_warn(card->dev,
                                 "Input device registration failed with error %i",
                                 err);
        }
#endif

        snd_m3_enable_ints(chip);
        snd_m3_assp_continue(chip);

        *chip_ret = chip;

        return 0; 

free_chip:
        snd_m3_free(chip);
        return err;
}

/*
 */
static int
snd_m3_probe(struct pci_dev *pci, const struct pci_device_id *pci_id)
{
        static int dev;
        struct snd_card *card;
        struct snd_m3 *chip;
        int err;

        /* don't pick up modems */
        if (((pci->class >> 8) & 0xffff) != PCI_CLASS_MULTIMEDIA_AUDIO)
                return -ENODEV;

        if (dev >= SNDRV_CARDS)
                return -ENODEV;
        if (!enable[dev]) {
                dev++;
                return -ENOENT;
        }

        err = snd_card_new(&pci->dev, index[dev], id[dev], THIS_MODULE,
                           0, &card);
        if (err < 0)
                return err;

        switch (pci->device) {
        case PCI_DEVICE_ID_ESS_ALLEGRO:
        case PCI_DEVICE_ID_ESS_ALLEGRO_1:
                strcpy(card->driver, "Allegro");
                break;
        case PCI_DEVICE_ID_ESS_CANYON3D_2LE:
        case PCI_DEVICE_ID_ESS_CANYON3D_2:
                strcpy(card->driver, "Canyon3D-2");
                break;
        default:
                strcpy(card->driver, "Maestro3");
                break;
        }

        err = snd_m3_create(card, pci, external_amp[dev], amp_gpio[dev], &chip);
        if (err < 0)
                goto free_card;

        card->private_data = chip;

        sprintf(card->shortname, "ESS %s PCI", card->driver);
        sprintf(card->longname, "%s at 0x%lx, irq %d",
                card->shortname, chip->iobase, chip->irq);

        err = snd_card_register(card);
        if (err < 0)
                goto free_card;

#if 0 /* TODO: not supported yet */
        /* TODO enable MIDI IRQ and I/O */
        err = snd_mpu401_uart_new(chip->card, 0, MPU401_HW_MPU401,
                                  chip->iobase + MPU401_DATA_PORT,
                                  MPU401_INFO_INTEGRATED | MPU401_INFO_IRQ_HOOK,
                                  -1, &chip->rmidi);
        if (err < 0)
                dev_warn(card->dev, "no MIDI support.\n");
#endif

        pci_set_drvdata(pci, card);
        dev++;
        return 0;

free_card:
        snd_card_free(card);
        return err;
}

static void snd_m3_remove(struct pci_dev *pci)
{
        snd_card_free(pci_get_drvdata(pci));
}

static struct pci_driver m3_driver = {
        .name = KBUILD_MODNAME,
        .id_table = snd_m3_ids,
        .probe = snd_m3_probe,
        .remove = snd_m3_remove,
        .driver = {
                .pm = M3_PM_OPS,
        },
};
        
module_pci_driver(m3_driver);