/* 
 *  os_linux.h
 * 
 * Home page of code is: http://www.smartmontools.org
 *
 * Copyright (C) 2003-8 Bruce Allen <smartmontools-support@lists.sourceforge.net>
 *
 * Derived from code that was
 *
 *  Written By: Adam Radford <linux@3ware.com>
 *  Modifications By: Joel Jacobson <linux@3ware.com>
 *                    Arnaldo Carvalho de Melo <acme@conectiva.com.br>
 *                    Brad Strand <linux@3ware.com>
 *
 *  Copyright (C) 1999-2003 3ware Inc.
 *
 *  Kernel compatablity By:     Andre Hedrick <andre@suse.com>
 *  Non-Copyright (C) 2000      Andre Hedrick <andre@suse.com>
 *
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * (for example COPYING); if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * This code was originally developed as a Senior Thesis by Michael Cornwell
 * at the Concurrent Systems Laboratory (now part of the Storage Systems
 * Research Center), Jack Baskin School of Engineering, University of
 * California, Santa Cruz. http://ssrc.soe.ucsc.edu/
 * 
 */


#ifndef OS_LINUX_H_
#define OS_LINUX_H_

#define OS_LINUX_H_CVSID "$Id: os_linux.h 4120 2015-08-27 16:12:21Z samm2 $\n"

/* 
   The following definitions/macros/prototypes are used for three
   different interfaces, referred to as "the three cases" below.
   CONTROLLER_3WARE_678K      -- 6000, 7000, and 8000 controllers via /dev/sd?
   CONTROLLER_3WARE_678K_CHAR -- 6000, 7000, and 8000 controllers via /dev/twe?
   CONTROLLER_3WARE_9000_CHAR -- 9000 controllers via /dev/twa?
*/

// USED FOR ALL THREE CASES

#define u32 unsigned int
#define TW_OP_ATA_PASSTHRU 0x11
#define MAX(x,y) ( (x)>(y)?(x):(y) )

#pragma pack(1)
/* Scatter gather list entry */
typedef struct TAG_TW_SG_Entry {
  unsigned int address;
  unsigned int length;
} TW_SG_Entry;

/* Command header for ATA pass-thru.  Note that for different
   drivers/interfaces the length of sg_list (here TW_ATA_PASS_SGL_MAX)
   is different.  But it can be taken as same for all three cases
   because it's never used to define any other structures, and we
   never use anything in the sg_list or beyond! */

#define TW_ATA_PASS_SGL_MAX      60

typedef struct TAG_TW_Passthru {
  struct {
    unsigned char opcode:5;
    unsigned char sgloff:3;
  } byte0;
  unsigned char size;
  unsigned char request_id;
  unsigned char unit;
  unsigned char status;  // On return, contains 3ware STATUS register
  unsigned char flags;
  unsigned short param;
  unsigned short features;  // On return, contains ATA ERROR register
  unsigned short sector_count;
  unsigned short sector_num;
  unsigned short cylinder_lo;
  unsigned short cylinder_hi;
  unsigned char drive_head;
  unsigned char command; // On return, contains ATA STATUS register
  TW_SG_Entry sg_list[TW_ATA_PASS_SGL_MAX];
  unsigned char padding[12];
} TW_Passthru;

// the following are for the SCSI interface only 

// Ioctl buffer: Note that this defn has changed in kernel tree...
// Total size is 1041 bytes -- this is really weird

#define TW_IOCTL                 0x80
#define TW_ATA_PASSTHRU          0x1e

// Adam -- should this be #pramga packed? Otherwise table_id gets
// moved for byte alignment.  Without packing, input passthru for SCSI
// ioctl is 31 bytes in.  With packing it is 30 bytes in.
typedef struct TAG_TW_Ioctl { 
  int input_length;
  int output_length;
  unsigned char cdb[16];
  unsigned char opcode;
  // This one byte of padding is missing from the typedefs in the
  // kernel code, but it is indeed present.  We put it explicitly
  // here, so that the structure can be packed.  Adam agrees with
  // this.
  unsigned char packing;
  unsigned short table_id;
  unsigned char parameter_id;
  unsigned char parameter_size_bytes;
  unsigned char unit_index;
  // Size up to here is 30 bytes + 1 padding!
  unsigned char input_data[499];
  // Reserve lots of extra space for commands that set Sector Count
  // register to large values
  unsigned char output_data[512]; // starts 530 bytes in!
  // two more padding bytes here if structure NOT packed.
} TW_Ioctl;

/* Ioctl buffer output -- SCSI interface only! */
typedef struct TAG_TW_Output {
  int padding[2];
  char output_data[512];
} TW_Output; 

// What follows is needed for 9000 char interface only

#define TW_IOCTL_FIRMWARE_PASS_THROUGH 0x108
#define TW_MAX_SGL_LENGTH_9000 61

typedef struct TAG_TW_Ioctl_Driver_Command_9000 {
  unsigned int control_code;
  unsigned int status;
  unsigned int unique_id;
  unsigned int sequence_id;
  unsigned int os_specific;
  unsigned int buffer_length;
} TW_Ioctl_Driver_Command_9000;

/* Command Packet */
typedef struct TW_Command_9000 {
  /* First DWORD */
  struct {
    unsigned char opcode:5;
    unsigned char sgl_offset:3;
  } byte0;
  unsigned char size;
  unsigned char request_id;
  struct {
    unsigned char unit:4;
    unsigned char host_id:4;
  } byte3;
  /* Second DWORD */
  unsigned char status;
  unsigned char flags;
  union {
    unsigned short block_count;
    unsigned short parameter_count;
    unsigned short message_credits;
  } byte6;
  union {
    struct {
      u32 lba;
      TW_SG_Entry sgl[TW_MAX_SGL_LENGTH_9000];
      u32 padding;
    } io;
    struct {
      TW_SG_Entry sgl[TW_MAX_SGL_LENGTH_9000];
      u32 padding[2];
    } param;
    struct {
      u32 response_queue_pointer;
      u32 padding[125]; /* pad entire structure to 512 bytes */
    } init_connection;
    struct {
      char version[504];
    } ioctl_miniport_version;
  } byte8;
} TW_Command_9000;

/* Command Packet for 9000+ controllers */
typedef struct TAG_TW_Command_Apache {
  struct {
    unsigned char opcode:5;
    unsigned char reserved:3;
  } command;
  unsigned char   unit;
  unsigned short  request_id;
  unsigned char   sense_length;
  unsigned char   sgl_offset;
  unsigned short  sgl_entries;
  unsigned char   cdb[16];
  TW_SG_Entry     sg_list[TW_MAX_SGL_LENGTH_9000];
} TW_Command_Apache;

/* New command packet header */
typedef struct TAG_TW_Command_Apache_Header {
  unsigned char sense_data[18];
  struct {
    char reserved[4];
    unsigned short error;
    unsigned char status;
    struct {
      unsigned char severity:3;
      unsigned char reserved:5;
    } substatus_block;
  } status_block;
  unsigned char err_specific_desc[102];
} TW_Command_Apache_Header;

/* This struct is a union of the 2 command packets */
typedef struct TAG_TW_Command_Full_9000 {
  TW_Command_Apache_Header header;
  union {
    TW_Command_9000   oldcommand;
    TW_Command_Apache newcommand;
  } command;
  unsigned char padding[384]; /* Pad to 1024 bytes */
} TW_Command_Full_9000;

typedef struct TAG_TW_Ioctl_Apache {
  TW_Ioctl_Driver_Command_9000 driver_command;
  char                         padding[488];
  TW_Command_Full_9000         firmware_command;
  char                         data_buffer[1];
  // three bytes of padding here if structure not packed!
} TW_Ioctl_Buf_Apache;



// START OF DEFINITIONS FOR THE CHARACTER INTERFACE TO THE
// 6000/7000/8000 drivers

#define TW_MAX_SGL_LENGTH        62
#define TW_CMD_PACKET_WITH_DATA 0x1f

/* Command Packet */
typedef struct TW_Command {
  /* First DWORD */
  struct {
    unsigned char opcode:5;
    unsigned char sgl_offset:3;
  } byte0;
  unsigned char size;
  unsigned char request_id;
  struct {
    unsigned char unit:4;
    unsigned char host_id:4;
  } byte3;
  /* Second DWORD */
  unsigned char status;
  unsigned char flags;
  union {
    unsigned short block_count;
    unsigned short parameter_count;
    unsigned short message_credits;
  } byte6;
  union {
    struct {
      u32 lba;
      TW_SG_Entry sgl[TW_MAX_SGL_LENGTH];
      u32 padding;	/* pad to 512 bytes */
    } io;
    struct {
      TW_SG_Entry sgl[TW_MAX_SGL_LENGTH];
      u32 padding[2];
    } param;
    struct {
      u32 response_queue_pointer;
      u32 padding[125];
    } init_connection;
    struct {
      char version[504];
    } ioctl_miniport_version;
  } byte8;
} TW_Command;

typedef struct TAG_TW_New_Ioctl {
  unsigned int  data_buffer_length;
  unsigned char padding [508];
  TW_Command    firmware_command;
  char          data_buffer[1];
  // three bytes of padding here
} TW_New_Ioctl;
#pragma pack()

#if 0
// Useful for checking/understanding packing of 3ware data structures
// above.
void my(int x, char *y){
  printf("The size of %30s is: %5d\n",y, x);
  return;
}

int main() {
  TW_Ioctl tmp;
  my(sizeof(TW_SG_Entry),"TW_SG_Entry");
  my(sizeof(TW_Passthru),"TW_Passthru");
  my(sizeof(TW_Ioctl),"TW_Ioctl");
  my(sizeof(TW_Output),"TW_Output");
  my(sizeof(TW_Ioctl_Driver_Command_9000),"TW_Ioctl_Driver_Command_9000");
  my(sizeof(TW_Command_9000),"TW_Command_9000");
  my(sizeof(TW_Command_Apache),"TW_Command_Apache");
  my(sizeof(TW_Command_Apache_Header),"TW_Command_Apache_Header");
  my(sizeof(TW_Command_Full_9000),"TW_Command_Full_9000");
  my(sizeof(TW_Ioctl_Buf_Apache),"TW_Ioctl_Buf_Apache");
  my(sizeof(TW_Command),"TW_Command");
  my(sizeof(TW_New_Ioctl),"TW_New_Ioctl");                                                                
  printf("TW_Ioctl.table_id - start = %d (irrelevant)\n",
         (void *)&tmp.table_id - (void *)&tmp);
  printf("TW_Ioctl.input_data - start = %d (input passthru location)\n",
         (void *)&tmp.input_data - (void *)&tmp);
  printf("TW_Ioctl.output_data - start = %d (irrelevant)\n",
         (void *)&tmp.output_data - (void *)&tmp);
  return 0;
}
#endif

// The following definitions are from hdreg.h in the kernel source
// tree.  They don't carry any Copyright statements, but I think they
// are primarily from Mark Lord and Andre Hedrick.
typedef unsigned char task_ioreg_t;

typedef struct hd_drive_task_hdr {
  task_ioreg_t data;
  task_ioreg_t feature;
  task_ioreg_t sector_count;
  task_ioreg_t sector_number;
  task_ioreg_t low_cylinder;
  task_ioreg_t high_cylinder;
  task_ioreg_t device_head;
  task_ioreg_t command;
} task_struct_t;

typedef union ide_reg_valid_s {
  unsigned all			: 16;
  struct {
    unsigned data		: 1;
    unsigned error_feature	: 1;
    unsigned sector		: 1;
    unsigned nsector		: 1;
    unsigned lcyl		: 1;
    unsigned hcyl		: 1;
    unsigned select		: 1;
    unsigned status_command	: 1;
    unsigned data_hob		: 1;
    unsigned error_feature_hob	: 1;
    unsigned sector_hob		: 1;
    unsigned nsector_hob	: 1;
    unsigned lcyl_hob		: 1;
    unsigned hcyl_hob		: 1;
    unsigned select_hob		: 1;
    unsigned control_hob	: 1;
  } b;
} ide_reg_valid_t;

typedef struct ide_task_request_s {
  task_ioreg_t	   io_ports[8];
  task_ioreg_t	   hob_ports[8];
  ide_reg_valid_t  out_flags;
  ide_reg_valid_t  in_flags;
  int		   data_phase;
  int		   req_cmd;
  unsigned long	   out_size;
  unsigned long	   in_size;
} ide_task_request_t;

#define TASKFILE_NO_DATA	  0x0000
#define TASKFILE_IN		  0x0001
#define TASKFILE_OUT		  0x0004
#define HDIO_DRIVE_TASK_HDR_SIZE  8*sizeof(task_ioreg_t)
#define IDE_DRIVE_TASK_NO_DATA	       0
#define IDE_DRIVE_TASK_IN	       2
#define IDE_DRIVE_TASK_OUT	       3
#define HDIO_DRIVE_CMD            0x031f
#define HDIO_DRIVE_TASK           0x031e
#define HDIO_DRIVE_TASKFILE       0x031d
#define HDIO_GET_IDENTITY         0x030d

#define HPTIO_CTL                       0x03ff // ioctl interface for HighPoint raid device

#endif /* OS_LINUX_H_ */
