/*
 * Adaptec AIC7xxx device driver for Linux.
 *
 * Copyright (c) 1994 John Aycock
 *   The University of Calgary Department of Computer Science.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; see the file COPYING.  If not, write to
 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 * 
 * Copyright (c) 2000-2003 Adaptec Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 *
 * $Id: //depot/aic7xxx/linux/drivers/scsi/aic7xxx/aic7xxx_osm.h#151 $
 *
 */
#ifndef _AIC7XXX_LINUX_H_
#define _AIC7XXX_LINUX_H_

#include <linux/types.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <asm/byteorder.h>
#include <asm/io.h>

#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_tcq.h>
#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_spi.h>

/* Core SCSI definitions */
#define AIC_LIB_PREFIX ahc

#include "cam.h"
#include "queue.h"
#include "scsi_message.h"
#include "aiclib.h"

/*********************************** Debugging ********************************/
#ifdef CONFIG_AIC7XXX_DEBUG_ENABLE
#ifdef CONFIG_AIC7XXX_DEBUG_MASK
#define AHC_DEBUG 1
#define AHC_DEBUG_OPTS CONFIG_AIC7XXX_DEBUG_MASK
#else
/*
 * Compile in debugging code, but do not enable any printfs.
 */
#define AHC_DEBUG 1
#endif
/* No debugging code. */
#endif

/************************* Forward Declarations *******************************/
struct ahc_softc;
typedef struct pci_dev *ahc_dev_softc_t;
typedef struct scsi_cmnd      *ahc_io_ctx_t;

/******************************* Byte Order ***********************************/
#define ahc_htobe16(x)  cpu_to_be16(x)
#define ahc_htobe32(x)  cpu_to_be32(x)
#define ahc_htobe64(x)  cpu_to_be64(x)
#define ahc_htole16(x)  cpu_to_le16(x)
#define ahc_htole32(x)  cpu_to_le32(x)
#define ahc_htole64(x)  cpu_to_le64(x)

#define ahc_be16toh(x)  be16_to_cpu(x)
#define ahc_be32toh(x)  be32_to_cpu(x)
#define ahc_be64toh(x)  be64_to_cpu(x)
#define ahc_le16toh(x)  le16_to_cpu(x)
#define ahc_le32toh(x)  le32_to_cpu(x)
#define ahc_le64toh(x)  le64_to_cpu(x)

/************************* Configuration Data *********************************/
extern u_int aic7xxx_no_probe;
extern u_int aic7xxx_allow_memio;
extern struct scsi_host_template aic7xxx_driver_template;

/***************************** Bus Space/DMA **********************************/

typedef uint32_t bus_size_t;

typedef enum {
        BUS_SPACE_MEMIO,
        BUS_SPACE_PIO
} bus_space_tag_t;

typedef union {
        u_long            ioport;
        volatile uint8_t __iomem *maddr;
} bus_space_handle_t;

typedef struct bus_dma_segment
{
        dma_addr_t      ds_addr;
        bus_size_t      ds_len;
} bus_dma_segment_t;

struct ahc_linux_dma_tag
{
        bus_size_t      alignment;
        bus_size_t      boundary;
        bus_size_t      maxsize;
};
typedef struct ahc_linux_dma_tag* bus_dma_tag_t;

typedef dma_addr_t bus_dmamap_t;

typedef int bus_dma_filter_t(void*, dma_addr_t);
typedef void bus_dmamap_callback_t(void *, bus_dma_segment_t *, int, int);

#define BUS_DMA_WAITOK          0x0
#define BUS_DMA_NOWAIT          0x1
#define BUS_DMA_ALLOCNOW        0x2
#define BUS_DMA_LOAD_SEGS       0x4     /*
                                         * Argument is an S/G list not
                                         * a single buffer.
                                         */

#define BUS_SPACE_MAXADDR       0xFFFFFFFF
#define BUS_SPACE_MAXADDR_32BIT 0xFFFFFFFF
#define BUS_SPACE_MAXSIZE_32BIT 0xFFFFFFFF

int     ahc_dma_tag_create(struct ahc_softc *, bus_dma_tag_t /*parent*/,
                           bus_size_t /*alignment*/, bus_size_t /*boundary*/,
                           dma_addr_t /*lowaddr*/, dma_addr_t /*highaddr*/,
                           bus_dma_filter_t*/*filter*/, void */*filterarg*/,
                           bus_size_t /*maxsize*/, int /*nsegments*/,
                           bus_size_t /*maxsegsz*/, int /*flags*/,
                           bus_dma_tag_t */*dma_tagp*/);

void    ahc_dma_tag_destroy(struct ahc_softc *, bus_dma_tag_t /*tag*/);

int     ahc_dmamem_alloc(struct ahc_softc *, bus_dma_tag_t /*dmat*/,
                         void** /*vaddr*/, int /*flags*/,
                         bus_dmamap_t* /*mapp*/);

void    ahc_dmamem_free(struct ahc_softc *, bus_dma_tag_t /*dmat*/,
                        void* /*vaddr*/, bus_dmamap_t /*map*/);

void    ahc_dmamap_destroy(struct ahc_softc *, bus_dma_tag_t /*tag*/,
                           bus_dmamap_t /*map*/);

int     ahc_dmamap_load(struct ahc_softc *ahc, bus_dma_tag_t /*dmat*/,
                        bus_dmamap_t /*map*/, void * /*buf*/,
                        bus_size_t /*buflen*/, bus_dmamap_callback_t *,
                        void */*callback_arg*/, int /*flags*/);

int     ahc_dmamap_unload(struct ahc_softc *, bus_dma_tag_t, bus_dmamap_t);

/*
 * Operations performed by ahc_dmamap_sync().
 */
#define BUS_DMASYNC_PREREAD     0x01    /* pre-read synchronization */
#define BUS_DMASYNC_POSTREAD    0x02    /* post-read synchronization */
#define BUS_DMASYNC_PREWRITE    0x04    /* pre-write synchronization */
#define BUS_DMASYNC_POSTWRITE   0x08    /* post-write synchronization */

/*
 * XXX
 * ahc_dmamap_sync is only used on buffers allocated with
 * the dma_alloc_coherent() API.  Although I'm not sure how
 * this works on architectures with a write buffer, Linux does
 * not have an API to sync "coherent" memory.  Perhaps we need
 * to do an mb()?
 */
#define ahc_dmamap_sync(ahc, dma_tag, dmamap, offset, len, op)

/********************************** Includes **********************************/
#ifdef CONFIG_AIC7XXX_REG_PRETTY_PRINT
#define AIC_DEBUG_REGISTERS 1
#else
#define AIC_DEBUG_REGISTERS 0
#endif
#include "aic7xxx.h"

/***************************** Timer Facilities *******************************/
static inline void
ahc_scb_timer_reset(struct scb *scb, u_int usec)
{
}

/***************************** SMP support ************************************/
#include <linux/spinlock.h>

#define AIC7XXX_DRIVER_VERSION "7.0"

/*************************** Device Data Structures ***************************/
/*
 * A per probed device structure used to deal with some error recovery
 * scenarios that the Linux mid-layer code just doesn't know how to
 * handle.  The structure allocated for a device only becomes persistent
 * after a successfully completed inquiry command to the target when
 * that inquiry data indicates a lun is present.
 */
typedef enum {
        AHC_DEV_FREEZE_TIL_EMPTY = 0x02, /* Freeze queue until active == 0 */
        AHC_DEV_Q_BASIC          = 0x10, /* Allow basic device queuing */
        AHC_DEV_Q_TAGGED         = 0x20, /* Allow full SCSI2 command queueing */
        AHC_DEV_PERIODIC_OTAG    = 0x40, /* Send OTAG to prevent starvation */
} ahc_linux_dev_flags;

struct ahc_linux_device {
        /*
         * The number of transactions currently
         * queued to the device.
         */
        int                     active;

        /*
         * The currently allowed number of
         * transactions that can be queued to
         * the device.  Must be signed for
         * conversion from tagged to untagged
         * mode where the device may have more
         * than one outstanding active transaction.
         */
        int                     openings;

        /*
         * A positive count indicates that this
         * device's queue is halted.
         */
        u_int                   qfrozen;

        /*
         * Cumulative command counter.
         */
        u_long                  commands_issued;

        /*
         * The number of tagged transactions when
         * running at our current opening level
         * that have been successfully received by
         * this device since the last QUEUE FULL.
         */
        u_int                   tag_success_count;
#define AHC_TAG_SUCCESS_INTERVAL 50

        ahc_linux_dev_flags     flags;

        /*
         * The high limit for the tags variable.
         */
        u_int                   maxtags;

        /*
         * The computed number of tags outstanding
         * at the time of the last QUEUE FULL event.
         */
        u_int                   tags_on_last_queuefull;

        /*
         * How many times we have seen a queue full
         * with the same number of tags.  This is used
         * to stop our adaptive queue depth algorithm
         * on devices with a fixed number of tags.
         */
        u_int                   last_queuefull_same_count;
#define AHC_LOCK_TAGS_COUNT 50

        /*
         * How many transactions have been queued
         * without the device going idle.  We use
         * this statistic to determine when to issue
         * an ordered tag to prevent transaction
         * starvation.  This statistic is only updated
         * if the AHC_DEV_PERIODIC_OTAG flag is set
         * on this device.
         */
        u_int                   commands_since_idle_or_otag;
#define AHC_OTAG_THRESH 500
};

/********************* Definitions Required by the Core ***********************/
/*
 * Number of SG segments we require.  So long as the S/G segments for
 * a particular transaction are allocated in a physically contiguous
 * manner and are allocated below 4GB, the number of S/G segments is
 * unrestricted.
 */
#define AHC_NSEG 128

/*
 * Per-SCB OSM storage.
 */
struct scb_platform_data {
        struct ahc_linux_device *dev;
        dma_addr_t               buf_busaddr;
        uint32_t                 xfer_len;
        uint32_t                 sense_resid;   /* Auto-Sense residual */
};

/*
 * Define a structure used for each host adapter.  All members are
 * aligned on a boundary >= the size of the member to honor the
 * alignment restrictions of the various platforms supported by
 * this driver.
 */
struct ahc_platform_data {
        /*
         * Fields accessed from interrupt context.
         */
        struct scsi_target *starget[AHC_NUM_TARGETS];

        spinlock_t               spin_lock;
        u_int                    qfrozen;
        struct completion       *eh_done;
        struct Scsi_Host        *host;          /* pointer to scsi host */
#define AHC_LINUX_NOIRQ ((uint32_t)~0)
        uint32_t                 irq;           /* IRQ for this adapter */
        uint32_t                 bios_address;
        resource_size_t          mem_busaddr;   /* Mem Base Addr */
};

void ahc_delay(long);


/***************************** Low Level I/O **********************************/
uint8_t ahc_inb(struct ahc_softc * ahc, long port);
void ahc_outb(struct ahc_softc * ahc, long port, uint8_t val);
void ahc_outsb(struct ahc_softc * ahc, long port,
               uint8_t *, int count);
void ahc_insb(struct ahc_softc * ahc, long port,
               uint8_t *, int count);

/**************************** Initialization **********************************/
int             ahc_linux_register_host(struct ahc_softc *,
                                        struct scsi_host_template *);

/******************************** Locking *************************************/
/* Lock protecting internal data structures */

static inline void
ahc_lockinit(struct ahc_softc *ahc)
{
        spin_lock_init(&ahc->platform_data->spin_lock);
}

static inline void
ahc_lock(struct ahc_softc *ahc, unsigned long *flags)
{
        spin_lock_irqsave(&ahc->platform_data->spin_lock, *flags);
}

static inline void
ahc_unlock(struct ahc_softc *ahc, unsigned long *flags)
{
        spin_unlock_irqrestore(&ahc->platform_data->spin_lock, *flags);
}

/******************************* PCI Definitions ******************************/
/*
 * PCIM_xxx: mask to locate subfield in register
 * PCIR_xxx: config register offset
 * PCIC_xxx: device class
 * PCIS_xxx: device subclass
 * PCIP_xxx: device programming interface
 * PCIV_xxx: PCI vendor ID (only required to fixup ancient devices)
 * PCID_xxx: device ID
 */
#define PCIR_DEVVENDOR          0x00
#define PCIR_VENDOR             0x00
#define PCIR_DEVICE             0x02
#define PCIR_COMMAND            0x04
#define PCIM_CMD_PORTEN         0x0001
#define PCIM_CMD_MEMEN          0x0002
#define PCIM_CMD_BUSMASTEREN    0x0004
#define PCIM_CMD_MWRICEN        0x0010
#define PCIM_CMD_PERRESPEN      0x0040
#define PCIM_CMD_SERRESPEN      0x0100
#define PCIR_STATUS             0x06
#define PCIR_REVID              0x08
#define PCIR_PROGIF             0x09
#define PCIR_SUBCLASS           0x0a
#define PCIR_CLASS              0x0b
#define PCIR_CACHELNSZ          0x0c
#define PCIR_LATTIMER           0x0d
#define PCIR_HEADERTYPE         0x0e
#define PCIM_MFDEV              0x80
#define PCIR_BIST               0x0f
#define PCIR_CAP_PTR            0x34

/* config registers for header type 0 devices */
#define PCIR_MAPS       0x10

typedef enum
{
        AHC_POWER_STATE_D0,
        AHC_POWER_STATE_D1,
        AHC_POWER_STATE_D2,
        AHC_POWER_STATE_D3
} ahc_power_state;

/**************************** VL/EISA Routines ********************************/
#ifdef CONFIG_EISA
int                      ahc_linux_eisa_init(void);
void                     ahc_linux_eisa_exit(void);
int                      aic7770_map_registers(struct ahc_softc *ahc,
                                               u_int port);
int                      aic7770_map_int(struct ahc_softc *ahc, u_int irq);
#else
static inline int       ahc_linux_eisa_init(void) {
        return -ENODEV;
}
static inline void      ahc_linux_eisa_exit(void) {
}
#endif

/******************************* PCI Routines *********************************/
#ifdef CONFIG_PCI
int                      ahc_linux_pci_init(void);
void                     ahc_linux_pci_exit(void);
int                      ahc_pci_map_registers(struct ahc_softc *ahc);
int                      ahc_pci_map_int(struct ahc_softc *ahc);

uint32_t                 ahc_pci_read_config(ahc_dev_softc_t pci,
                                             int reg, int width);

void                     ahc_pci_write_config(ahc_dev_softc_t pci,
                                              int reg, uint32_t value,
                                              int width);

static inline int ahc_get_pci_function(ahc_dev_softc_t);
static inline int
ahc_get_pci_function(ahc_dev_softc_t pci)
{
        return (PCI_FUNC(pci->devfn));
}

static inline int ahc_get_pci_slot(ahc_dev_softc_t);
static inline int
ahc_get_pci_slot(ahc_dev_softc_t pci)
{
        return (PCI_SLOT(pci->devfn));
}

static inline int ahc_get_pci_bus(ahc_dev_softc_t);
static inline int
ahc_get_pci_bus(ahc_dev_softc_t pci)
{
        return (pci->bus->number);
}
#else
static inline int ahc_linux_pci_init(void) {
        return 0;
}
static inline void ahc_linux_pci_exit(void) {
}
#endif

static inline void ahc_flush_device_writes(struct ahc_softc *);
static inline void
ahc_flush_device_writes(struct ahc_softc *ahc)
{
        /* XXX Is this sufficient for all architectures??? */
        ahc_inb(ahc, INTSTAT);
}

/**************************** Proc FS Support *********************************/
int     ahc_proc_write_seeprom(struct Scsi_Host *, char *, int);
int     ahc_linux_show_info(struct seq_file *, struct Scsi_Host *);

/*************************** Domain Validation ********************************/
/*********************** Transaction Access Wrappers *************************/

static inline
void ahc_cmd_set_transaction_status(struct scsi_cmnd *cmd, uint32_t status)
{
        cmd->result &= ~(CAM_STATUS_MASK << 16);
        cmd->result |= status << 16;
}

static inline
void ahc_set_transaction_status(struct scb *scb, uint32_t status)
{
        ahc_cmd_set_transaction_status(scb->io_ctx,status);
}

static inline
void ahc_cmd_set_scsi_status(struct scsi_cmnd *cmd, uint32_t status)
{
        cmd->result &= ~0xFFFF;
        cmd->result |= status;
}

static inline
void ahc_set_scsi_status(struct scb *scb, uint32_t status)
{
        ahc_cmd_set_scsi_status(scb->io_ctx, status);
}

static inline
uint32_t ahc_cmd_get_transaction_status(struct scsi_cmnd *cmd)
{
        return ((cmd->result >> 16) & CAM_STATUS_MASK);
}

static inline
uint32_t ahc_get_transaction_status(struct scb *scb)
{
        return (ahc_cmd_get_transaction_status(scb->io_ctx));
}

static inline
uint32_t ahc_cmd_get_scsi_status(struct scsi_cmnd *cmd)
{
        return (cmd->result & 0xFFFF);
}

static inline
uint32_t ahc_get_scsi_status(struct scb *scb)
{
        return (ahc_cmd_get_scsi_status(scb->io_ctx));
}

static inline
void ahc_set_transaction_tag(struct scb *scb, int enabled, u_int type)
{
        /*
         * Nothing to do for linux as the incoming transaction
         * has no concept of tag/non tagged, etc.
         */
}

static inline
u_long ahc_get_transfer_length(struct scb *scb)
{
        return (scb->platform_data->xfer_len);
}

static inline
int ahc_get_transfer_dir(struct scb *scb)
{
        return (scb->io_ctx->sc_data_direction);
}

static inline
void ahc_set_residual(struct scb *scb, u_long resid)
{
        scsi_set_resid(scb->io_ctx, resid);
}

static inline
void ahc_set_sense_residual(struct scb *scb, u_long resid)
{
        scb->platform_data->sense_resid = resid;
}

static inline
u_long ahc_get_residual(struct scb *scb)
{
        return scsi_get_resid(scb->io_ctx);
}

static inline
u_long ahc_get_sense_residual(struct scb *scb)
{
        return (scb->platform_data->sense_resid);
}

static inline
int ahc_perform_autosense(struct scb *scb)
{
        /*
         * We always perform autosense in Linux.
         * On other platforms this is set on a
         * per-transaction basis.
         */
        return (1);
}

static inline uint32_t
ahc_get_sense_bufsize(struct ahc_softc *ahc, struct scb *scb)
{
        return (sizeof(struct scsi_sense_data));
}

static inline void
ahc_notify_xfer_settings_change(struct ahc_softc *ahc,
                                struct ahc_devinfo *devinfo)
{
        /* Nothing to do here for linux */
}

static inline void
ahc_platform_scb_free(struct ahc_softc *ahc, struct scb *scb)
{
}

int     ahc_platform_alloc(struct ahc_softc *ahc, void *platform_arg);
void    ahc_platform_free(struct ahc_softc *ahc);
void    ahc_platform_freeze_devq(struct ahc_softc *ahc, struct scb *scb);

static inline void
ahc_freeze_scb(struct scb *scb)
{
        if ((scb->io_ctx->result & (CAM_DEV_QFRZN << 16)) == 0) {
                scb->io_ctx->result |= CAM_DEV_QFRZN << 16;
                scb->platform_data->dev->qfrozen++;
        }
}

void    ahc_platform_set_tags(struct ahc_softc *ahc, struct scsi_device *sdev,
                              struct ahc_devinfo *devinfo, ahc_queue_alg);
int     ahc_platform_abort_scbs(struct ahc_softc *ahc, int target,
                                char channel, int lun, u_int tag,
                                role_t role, uint32_t status);
irqreturn_t
        ahc_linux_isr(int irq, void *dev_id);
void    ahc_platform_flushwork(struct ahc_softc *ahc);
void    ahc_done(struct ahc_softc*, struct scb*);
void    ahc_send_async(struct ahc_softc *, char channel,
                       u_int target, u_int lun, ac_code);
void    ahc_print_path(struct ahc_softc *, struct scb *);

#ifdef CONFIG_PCI
#define AHC_PCI_CONFIG 1
#else
#define AHC_PCI_CONFIG 0
#endif
#define bootverbose aic7xxx_verbose
extern u_int aic7xxx_verbose;
#endif /* _AIC7XXX_LINUX_H_ */