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/*
    atadevice.c -- ATA Device simulation
    Simulates a harddisk, using a local streams.
    Copyright (C) 2002 Richard Herveille, rherveille@opencores.org
 
    This file is part of OpenRISC 1000 Architectural Simulator
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
 
#include <string.h>
#include <stdarg.h>
 
#include "config.h"
 
#ifdef HAVE_INTTYPES_H
#include <inttypes.h>
#endif
 
#include "port.h"
#include "arch.h"
#include "abstract.h"
 
#include "messages.h"
#include "atadevice.h"
#include "atacmd.h"
#include "sim-config.h"
#include "atadevice_cmdi.h"
 
/*
 mandatory commands:
 - execute device diagnostics       (done)
 - flush cache
 - identify device                  (done)
 - initialize device parameters     (done)
 - read dma
 - read multiple
 - read sector(s)                   (done)
 - read verify sector(s)
 - seek
 - set features
 - set multiple mode
 - write dma
 - write multiple
 - write sector(s)
 
 
 optional commands:
 - download microcode
 - nop
 - read buffer
 - write buffer
 
 
 prohibited commands:
 - device reset
*/
 
 
/*
  D E V I C E S _ I N I T
*/
void ata_devices_init(ata_devices *devices)
{
  ata_device_init(&devices->device0, 0);
 
  if (devices->device0.type)
    ata_device_init(&devices->device1, ATA_DHR_DEV);
  else
    ata_device_init(&devices->device1,           0);
}
 
 
void ata_device_init(ata_device *device, int dev)
{
  /* set DeviceID                                                     */
  device->internals.dev = dev;
 
  /* generate stream for hd_simulation                                */
  switch(device->type)
  {
    case TYPE_NO_CONNECT:
      MSG_NOTE("ata_device, using type NO_CONNECT.");
      device->stream = NULL;
      break;
 
    case TYPE_FILE:
      MSG_NOTE("ata_device, using device type FILE.");
      device->stream = open_file(&device->size, device->file);
      break;
 
    case TYPE_LOCAL:
      MSG_NOTE("ata_device, using device type LOCAL.");
      device->stream = open_local();
      break;
 
    default:
      MSG_FATAL("ata_device, illegal device-type.");
      MSG_EMPTY("defaulting to type NO_CONNECT.");
      device->stream = NULL;
      break;
  }
}
 
/* Use a file to simulate a hard-disk                                 */
FILE *open_file(unsigned long *size, const char *filename)
{
   FILE *fp;
   unsigned long  n;
 
   // TODO:
 
   /* check if a file with name 'filename' already exists             */
   if ( !(fp = fopen(filename, "rb+")) )
     if ( !(fp = fopen(filename, "wb+")) )
     {
       MSG_FATAL( strcat("ata_open_file, cannot open hd-file ", filename) );
       return NULL;
     }
     else
     {
       /* TODO create a file 'size' large */
       /* create a file 'size' large                                  */
       MSG_NOTE("ata_device; generating a new hard disk file.");
       MSG_EMPTY("This may take a while, depending on the requested size.");
       for (n=0; n < (*size << 20); n++)
         fputc(0, fp);
     }
   else /* file already exist                                         */
     fprintf(stderr, "file %s already exists. Using existing file.\n", filename);
 
 
   ata_device_debug(1, "requested filesize was: %d (MBytes).\n", *size);
 
   /* get the size of the file. This is also the size of the harddisk*/
   fseek(fp, 0, SEEK_END);
   *size = ftell(fp);
 
   ata_device_debug(1, "actual filesize is: %d (MBytes).\n", *size >> 20);
 
   return fp;
}
 
 
/* Use a the local filesystem as a hard-disk                          */
FILE *open_local(void)
{
 // TODO:
 MSG_WARNING("ata_device; device type LOCAL is not supported yet.");
 MSG_EMPTY("defaulting to device type NO_CONNECT.");
 return NULL;
}
 
 
 
 
/*
  D E V I C E S _ H W _ R E S E T
*/
/* power-on and hardware reset                                        */
void ata_devices_hw_reset(ata_devices *devices, int reset_signal)
{
  /* display debug information                                        */
  ata_device_debug(2, "ata_devices_hw_reset.\n");
 
  /* find device 0                                                    */
  if ( (devices->device0.stream) && (devices->device1.stream) )
  {
    /* this one is simple, device0 is device0                         */
 
    /* 1) handle device1 first                                        */
    ata_device_hw_reset(&devices->device1, reset_signal,
                        1,   /* assert dasp, this is device1          */
                        0,   /* negate pdiag input, no more devices   */
                        0);  /* negate dasp input, no more devices    */
 
    /* 2) Then handle device0                                         */
    ata_device_hw_reset(&devices->device0, reset_signal,
                        0,
                        devices->device1.sigs.pdiago,
                        devices->device1.sigs.daspo);
  }
  else if (devices->device0.stream)
  {
    /* device0 is device0, there's no device1                         */
    ata_device_hw_reset(&devices->device0, reset_signal,
                        0,   /* negate dasp, this is device0          */
                        0,   /* negate pdiag input, there's no device1*/
                        0);  /* negate dasp input, there's no device1 */
  }
  else if (devices->device1.stream)
  {
    /* device1 is (logical) device0, there's no (physical) device0    */
    ata_device_hw_reset(&devices->device1, reset_signal,
                        0,   /* negate dasp, this is device0          */
                        0,   /* negate pdiag input, there's no device1*/
                        0);  /* negate dasp input, there's no device1 */
  }
  else
  {
    /* no devices connected                                           */
    ata_device_debug(1, "ata_device_hw_reset, no devices connected.\n");
  }
}
 
void ata_device_hw_reset(ata_device *device, int reset_signal,
  int daspo, int pdiagi, int daspi)
{
    /* check ata-device state                                         */
    if (device->internals.state == ATA_STATE_HW_RST)
    {
      if (!reset_signal)
      {
        /* hardware reset finished                                    */
 
        /* set sectors_per_track & heads_per_cylinders                */
        device->internals.sectors_per_track = SECTORS;
        device->internals.heads_per_cylinder = HEADS;
 
        /* set device1 input signals                                  */
        device->sigs.pdiagi = pdiagi;
        device->sigs.daspi  = daspi;
 
        ata_execute_device_diagnostics_cmd(device);
 
        /* clear busy bit                                             */
        device->regs.status &= ~ATA_SR_BSY;
 
        /* set DRDY bit, when not a PACKET device                     */
        if (!device->packet)
            device->regs.status |= ATA_SR_DRDY;
 
        /* set new state                                              */
        device->internals.state = ATA_STATE_IDLE;
      }
    }
    else
      if (reset_signal)
      {
        /* hardware reset signal asserted, stop what we are doing     */
 
        /* negate bus signals                                         */
        device->sigs.iordy  = 0;
        device->sigs.intrq  = 0;
        device->sigs.dmarq  = 0;
        device->sigs.pdiago = 0;
        device->sigs.daspo  = daspo;
 
        /* set busy bit                                               */
        device->regs.status |= ATA_SR_BSY;
        PRINTF("setting status register BSY 0x%2X\n", device->regs.status);
 
        /* set new state                                              */
        device->internals.state = ATA_STATE_HW_RST;
      }
}
 
 
/*
  D E V I C E S _ D O _ C O N T R O L _ R E G I S T E R
 
  Handles - software reset
          - Interrupt enable bit
*/
void ata_device_do_control_register(ata_device *device)
{
    /* TODO respond to new values of nIEN */
    /* if device not selected, respond to new values of nIEN & SRST */
 
  /* check if SRST bit is set                                         */
  if (device->regs.device_control & ATA_DCR_RST)
  {
    if (device->internals.state == ATA_STATE_IDLE)
    {   /* start software reset                                       */
        /* negate bus signals                                         */
        device->sigs.pdiago = 0;
        device->sigs.intrq  = 0;
        device->sigs.iordy  = 0;
        device->sigs.dmarq  = 0;
 
        /* set busy bit                                               */
        device->regs.status |= ATA_SR_BSY;
 
        /* set new state                                              */
        device->internals.state = ATA_STATE_SW_RST;
 
        /* display debug information                                  */
        ata_device_debug(2, "ata_device_sw_reset initiated.\n");
    }
  }
  else if (device->internals.state == ATA_STATE_SW_RST)
  {   /* are we doing a software reset ??                             */
      /* SRST bit cleared, end of software reset                      */
 
      /*execute device diagnostics                                    */
      ata_execute_device_diagnostics_cmd(device);
 
      /* clear busy bit                                               */
      device->regs.status &= ~ATA_SR_BSY;
 
      /* set DRDY bit, when not a PACKET device                       */
      if (!device->packet)
        device->regs.status |= ATA_SR_DRDY;
 
      /* set new state                                                */
      device->internals.state = ATA_STATE_IDLE;
 
      /* display debug information                                    */
      ata_device_debug(2, "ata_device_sw_reset done.\n");
  }
  /*
  <else> We are doing a hardware reset (or similar)
         ignore command
  */
}
 
 
/*
  D E V I C E S _ D O _ C O M M A N D _ R E G I S T E R
*/
void ata_device_do_command_register(ata_device *device)
{
  /* check BSY & DRQ                                                  */
  if ( (device->regs.status & ATA_SR_BSY) || (device->regs.status & ATA_SR_DRQ) )
     if (device->regs.command != DEVICE_RESET)
        MSG_WARNING("ata_device_write, writing a command while BSY or DRQ asserted.");
 
  /* check if device selected                                         */
  if ( (device->regs.device_head & ATA_DHR_DEV) == device->internals.dev )
      ata_device_execute_cmd(device);
  else
  {
      /* if not selected, only respond to EXECUTE DEVICE DIAGNOSTICS  */
      if (device->regs.command == EXECUTE_DEVICE_DIAGNOSTICS)
          ata_device_execute_cmd(device);
  }
}
 
 
/*
  D E V I C E S _ R E A D
*/
/* Read from devices                                                  */
short ata_devices_read(ata_devices *devices, char adr)
{
    ata_device *device;
 
    /* check for no connected devices                                 */
    if ( (!devices->device0.stream) && (!devices->device1.stream) )
        MSG_ERROR("ata_devices_read, no ata devices connected.");
    else
    {
      /* check if both device0 and device1 are connected              */
      if ( (devices->device0.stream) && (devices->device1.stream) )
      {
          /* get the current active device                            */
          if (devices->device1.regs.device_head & ATA_DHR_DEV)
              device = &devices->device1;
          else
              device = &devices->device0;
      }
      else
      {
          /* only one device connected                                */
          if (devices->device1.stream)
              device = &devices->device1;
          else
              device = &devices->device0;
      }
 
      /* return data provided by selected device                      */
      switch (adr) {
        case ATA_ASR :
          ata_device_debug(4, "alternate_status register read\n");
          if ( (device->regs.device_head & ATA_DHR_DEV) ==  device->internals.dev )
              return device -> regs.status;
          else
          {
              ata_device_debug(2, "device0 responds for device1, asr = 0x00\n");
              return 0; // return 0 when device0 responds for device1
          }
 
        case ATA_CHR :
          ata_device_debug(4, "cylinder_high register read, value = 0x%02X\n",
                 device->regs.cylinder_high);
          return device -> regs.cylinder_high;
 
        case ATA_CLR :
          ata_device_debug(4, "cylinder_low register read, value = 0x%02X\n",
                 device->regs.cylinder_low);
          return device -> regs.cylinder_low;
 
        case ATA_DR  :
          if (!device->regs.status & ATA_SR_DRQ)
          {
             ata_device_debug(1, "data register read, while DRQ bit negated\n" );
             return 0;
          }
          else
          {
              ata_device_debug(4, "data register read, value = 0x%04X, cnt = %3d\n",
                     *device->internals.dbuf_ptr, device->internals.dbuf_cnt);
              if (!--device->internals.dbuf_cnt)
                   device->regs.status &= ~ATA_SR_DRQ;
              return *device -> internals.dbuf_ptr++;
          }
 
        case ATA_DHR :
          ata_device_debug(4, "device_head register read, value = 0x%02X\n",
                 device->regs.device_head);
          return device -> regs.device_head;
 
        case ATA_ERR :
          ata_device_debug(4, "error register read, value = 0x%02X\n",
                 device->regs.error);
          return device -> regs.error;
 
        case ATA_SCR :
          ata_device_debug(4, "sectorcount register read, value = 0x%02X\n",
                 device->regs.sector_count);
          return device -> regs.sector_count;
 
        case ATA_SNR :
          ata_device_debug(4, "sectornumber register read, value = 0x%02X\n",
                 device->regs.sector_number);
          return device -> regs.sector_number;
 
        case ATA_SR  :
          ata_device_debug(4, "status register read\n");
          if ( (device->regs.device_head & ATA_DHR_DEV) ==  device->internals.dev)
              return device -> regs.status;
          else
          {
              ata_device_debug(2, "device0 responds for device1, sr = 0x00\n");
              return 0; // return 0 when device0 responds for device1
          }
 
//        case ATA_DA   :
//          return device -> regs.status;
      }
    }
}
 
 
/*
  D E V I C E S _ W R I T E
*/
/* Write to devices                                                   */
void ata_devices_write(ata_devices *devices, char adr, short value)
{
    /* check for no connected devices                                 */
    if (!devices->device0.stream && !devices->device1.stream)
        MSG_ERROR("ata_devices_write, no ata devices connected.");
    else
    {
      /* first device                                                 */
      if (devices->device0.stream)
          ata_device_write(&devices->device0, adr, value);
 
      /* second device                                                */
      if (devices->device1.stream)
          ata_device_write(&devices->device1, adr, value);
    }
}
 
/* write to a single device                                           */
void ata_device_write(ata_device *device, char adr, short value)
{
    switch (adr) {
        case ATA_CR  :
            /*display debug information                               */
            ata_device_debug(4, "command register written, value = 0x%02X\n", value);
 
            device->regs.command = value;
 
            /* check command register settings and execute command    */
            ata_device_do_command_register(device);
            break;
 
 
        case ATA_CHR :
            /*display debug information                               */
            ata_device_debug(4, "cylinder high register written, value = 0x%02X\n", value);
 
            device->regs.cylinder_high = value;
            break;
 
        case ATA_CLR :
            /*display debug information                               */
            ata_device_debug(4, "cylinder low register written, value = 0x%02X\n", value);
 
            device->regs.cylinder_low = value;
            break;
 
        case ATA_DR :
            /*display debug information                               */
            ata_device_debug(4, "data register written, value = 0x%04X\n", value);
 
            device->regs.dataport_i = value;
            break;
 
        case ATA_DCR :
            /*display debug information                               */
            ata_device_debug(4, "device control register written, value = 0x%02X\n", value);
 
            device->regs.device_control = value;
            ata_device_do_control_register(device);
            break;
 
        case ATA_DHR :
            /*display debug information                               */
            ata_device_debug(4, "device head register written, value = 0x%02X\n", value);
 
            device->regs.device_head = value;
            break;
 
        case ATA_FR  :
            /*display debug information                               */
            ata_device_debug(4, "features register written, value = 0x%02X\n", value);
 
            device->regs.features = value;
            break;
 
        case ATA_SCR :
            /*display debug information                               */
            ata_device_debug(4, "sectorcount register written, value = 0x%02X\n", value);
 
            device->regs.sector_count = value;
            break;
 
        case ATA_SNR :
            /*display debug information                               */
            ata_device_debug(4, "sectornumber register written, value = 0x%02X\n", value);
 
            device->regs.sector_number = value;
            break;
 
    } //endcase
}
 
 
/* --------------------------                                         */
/* -- print debug messages --                                         */
/* --------------------------                                         */
int ata_device_debug(int lvl, char *format, ...)
{
  va_list ap;
 
  va_start(ap, format);
 
  if (ATA_DEVICE_DEBUG_LVL >= lvl)
  {
    fprintf(stderr, "ata_device_debug: ");
    vfprintf(stderr, format, ap);
  }
 
  va_end(ap);
  return 0;
}

Line No.	Rev	Author	Line
1	876	rherveille	`/*`
2			`atadevice.c -- ATA Device simulation`
3			`Simulates a harddisk, using a local streams.`
4			`Copyright (C) 2002 Richard Herveille, rherveille@opencores.org`
5
6			`This file is part of OpenRISC 1000 Architectural Simulator`
7
8			`This program is free software; you can redistribute it and/or modify`
9			`it under the terms of the GNU General Public License as published by`
10			`the Free Software Foundation; either version 2 of the License, or`
11			`(at your option) any later version`
12
13			`This program is distributed in the hope that it will be useful,`
14			`but WITHOUT ANY WARRANTY; without even the implied warranty of`
15			`MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the`
16			`GNU General Public License for more details.`
17
18			`You should have received a copy of the GNU General Public License`
19			`along with this program; if not, write to the Free Software`
20			`Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.`
21			`*/`
22
23	1350	nogj	`#include <string.h>`
24			`#include <stdarg.h>`
25
26			`#include "config.h"`
27
28			`#ifdef HAVE_INTTYPES_H`
29			`#include <inttypes.h>`
30			`#endif`
31
32			`#include "port.h"`
33			`#include "arch.h"`
34	876	rherveille	`#include "abstract.h"`
35
36			`#include "messages.h"`
37			`#include "atadevice.h"`
38			`#include "atacmd.h"`
39			`#include "sim-config.h"`
40			`#include "atadevice_cmdi.h"`
41
42			`/*`
43			`mandatory commands:`
44	919	rherveille	`- execute device diagnostics (done)`
45	876	rherveille	`- flush cache`
46	919	rherveille	`- identify device (done)`
47			`- initialize device parameters (done)`
48	876	rherveille	`- read dma`
49			`- read multiple`
50	919	rherveille	`- read sector(s) (done)`
51	876	rherveille	`- read verify sector(s)`
52			`- seek`
53			`- set features`
54			`- set multiple mode`
55			`- write dma`
56			`- write multiple`
57			`- write sector(s)`
58
59
60			`optional commands:`
61			`- download microcode`
62			`- nop`
63			`- read buffer`
64			`- write buffer`
65
66
67			`prohibited commands:`
68			`- device reset`
69			`*/`
70
71
72			`/*`
73			`D E V I C E S _ I N I T`
74			`*/`
75	1364	nogj	`void ata_devices_init(ata_devices *devices)`
76	876	rherveille	`{`
77	1364	nogj	`ata_device_init(&devices->device0, 0);`
78	876	rherveille
79			`if (devices->device0.type)`
80	1364	nogj	`ata_device_init(&devices->device1, ATA_DHR_DEV);`
81	876	rherveille	`else`
82	1364	nogj	`ata_device_init(&devices->device1, 0);`
83	876	rherveille	`}`
84
85
86	1364	nogj	`void ata_device_init(ata_device *device, int dev)`
87	876	rherveille	`{`
88			`/* set DeviceID */`
89	1065	rherveille	`device->internals.dev = dev;`
90	876	rherveille
91			`/* generate stream for hd_simulation */`
92			`switch(device->type)`
93			`{`
94			`case TYPE_NO_CONNECT:`
95			`MSG_NOTE("ata_device, using type NO_CONNECT.");`
96			`device->stream = NULL;`
97			`break;`
98
99			`case TYPE_FILE:`
100			`MSG_NOTE("ata_device, using device type FILE.");`
101	1364	nogj	`device->stream = open_file(&device->size, device->file);`
102	876	rherveille	`break;`
103
104			`case TYPE_LOCAL:`
105			`MSG_NOTE("ata_device, using device type LOCAL.");`
106			`device->stream = open_local();`
107			`break;`
108
109			`default:`
110			`MSG_FATAL("ata_device, illegal device-type.");`
111			`MSG_EMPTY("defaulting to type NO_CONNECT.");`
112			`device->stream = NULL;`
113			`break;`
114			`}`
115			`}`
116
117			`/* Use a file to simulate a hard-disk */`
118			`FILE open_file(unsigned long size, const char *filename)`
119			`{`
120			`FILE *fp;`
121			`unsigned long n;`
122
123			`// TODO:`
124
125			`/* check if a file with name 'filename' already exists */`
126			`if ( !(fp = fopen(filename, "rb+")) )`
127			`if ( !(fp = fopen(filename, "wb+")) )`
128			`{`
129			`MSG_FATAL( strcat("ata_open_file, cannot open hd-file ", filename) );`
130			`return NULL;`
131			`}`
132			`else`
133			`{`
134			`/* TODO create a file 'size' large */`
135			`/* create a file 'size' large */`
136			`MSG_NOTE("ata_device; generating a new hard disk file.");`
137			`MSG_EMPTY("This may take a while, depending on the requested size.");`
138			`for (n=0; n < (*size << 20); n++)`
139			`fputc(0, fp);`
140			`}`
141			`else /* file already exist */`
142			`fprintf(stderr, "file %s already exists. Using existing file.\n", filename);`
143
144
145			`ata_device_debug(1, "requested filesize was: %d (MBytes).\n", *size);`
146
147			`/* get the size of the file. This is also the size of the harddisk*/`
148			`fseek(fp, 0, SEEK_END);`
149			`*size = ftell(fp);`
150
151			`ata_device_debug(1, "actual filesize is: %d (MBytes).\n", *size >> 20);`
152
153			`return fp;`
154			`}`
155
156
157			`/* Use a the local filesystem as a hard-disk */`
158			`FILE *open_local(void)`
159			`{`
160			`// TODO:`
161			`MSG_WARNING("ata_device; device type LOCAL is not supported yet.");`
162			`MSG_EMPTY("defaulting to device type NO_CONNECT.");`
163			`return NULL;`
164			`}`
165
166
167
168
169			`/*`
170			`D E V I C E S _ H W _ R E S E T`
171			`*/`
172			`/* power-on and hardware reset */`
173			`void ata_devices_hw_reset(ata_devices *devices, int reset_signal)`
174			`{`
175			`/* display debug information */`
176	919	rherveille	`ata_device_debug(2, "ata_devices_hw_reset.\n");`
177	876	rherveille
178			`/* find device 0 */`
179			`if ( (devices->device0.stream) && (devices->device1.stream) )`
180			`{`
181			`/* this one is simple, device0 is device0 */`
182
183			`/* 1) handle device1 first */`
184	1065	rherveille	`ata_device_hw_reset(&devices->device1, reset_signal,`
185			`1, /* assert dasp, this is device1 */`
186			`0, /* negate pdiag input, no more devices */`
187	876	rherveille	`0); /* negate dasp input, no more devices */`
188
189			`/* 2) Then handle device0 */`
190	1065	rherveille	`ata_device_hw_reset(&devices->device0, reset_signal,`
191			`0,`
192			`devices->device1.sigs.pdiago,`
193	876	rherveille	`devices->device1.sigs.daspo);`
194			`}`
195			`else if (devices->device0.stream)`
196			`{`
197			`/* device0 is device0, there's no device1 */`
198	1065	rherveille	`ata_device_hw_reset(&devices->device0, reset_signal,`
199			`0, /* negate dasp, this is device0 */`
200			`0, /* negate pdiag input, there's no device1*/`
201	876	rherveille	`0); /* negate dasp input, there's no device1 */`
202			`}`
203			`else if (devices->device1.stream)`
204			`{`
205			`/* device1 is (logical) device0, there's no (physical) device0 */`
206	1065	rherveille	`ata_device_hw_reset(&devices->device1, reset_signal,`
207			`0, /* negate dasp, this is device0 */`
208			`0, /* negate pdiag input, there's no device1*/`
209	876	rherveille	`0); /* negate dasp input, there's no device1 */`
210			`}`
211			`else`
212			`{`
213			`/* no devices connected */`
214			`ata_device_debug(1, "ata_device_hw_reset, no devices connected.\n");`
215			`}`
216			`}`
217
218	1065	rherveille	`void ata_device_hw_reset(ata_device *device, int reset_signal,`
219	876	rherveille	`int daspo, int pdiagi, int daspi)`
220			`{`
221			`/* check ata-device state */`
222	1065	rherveille	`if (device->internals.state == ATA_STATE_HW_RST)`
223	876	rherveille	`{`
224			`if (!reset_signal)`
225			`{`
226			`/* hardware reset finished */`
227	1065	rherveille
228	876	rherveille	`/* set sectors_per_track & heads_per_cylinders */`
229	1065	rherveille	`device->internals.sectors_per_track = SECTORS;`
230			`device->internals.heads_per_cylinder = HEADS;`
231	876	rherveille
232			`/* set device1 input signals */`
233			`device->sigs.pdiagi = pdiagi;`
234			`device->sigs.daspi = daspi;`
235
236			`ata_execute_device_diagnostics_cmd(device);`
237
238			`/* clear busy bit */`
239			`device->regs.status &= ~ATA_SR_BSY;`
240
241			`/* set DRDY bit, when not a PACKET device */`
242			`if (!device->packet)`
243			`device->regs.status \|= ATA_SR_DRDY;`
244
245			`/* set new state */`
246	1065	rherveille	`device->internals.state = ATA_STATE_IDLE;`
247	876	rherveille	`}`
248			`}`
249			`else`
250			`if (reset_signal)`
251			`{`
252			`/* hardware reset signal asserted, stop what we are doing */`
253
254			`/* negate bus signals */`
255			`device->sigs.iordy = 0;`
256			`device->sigs.intrq = 0;`
257			`device->sigs.dmarq = 0;`
258			`device->sigs.pdiago = 0;`
259			`device->sigs.daspo = daspo;`
260
261			`/* set busy bit */`
262			`device->regs.status \|= ATA_SR_BSY;`
263	997	markom	`PRINTF("setting status register BSY 0x%2X\n", device->regs.status);`
264	876	rherveille
265			`/* set new state */`
266	1065	rherveille	`device->internals.state = ATA_STATE_HW_RST;`
267	876	rherveille	`}`
268			`}`
269
270
271			`/*`
272			`D E V I C E S _ D O _ C O N T R O L _ R E G I S T E R`
273
274			`Handles - software reset`
275			`- Interrupt enable bit`
276			`*/`
277			`void ata_device_do_control_register(ata_device *device)`
278			`{`
279			`/* TODO respond to new values of nIEN */`
280			`/* if device not selected, respond to new values of nIEN & SRST */`
281
282			`/* check if SRST bit is set */`
283			`if (device->regs.device_control & ATA_DCR_RST)`
284			`{`
285	1065	rherveille	`if (device->internals.state == ATA_STATE_IDLE)`
286	876	rherveille	`{ /* start software reset */`
287			`/* negate bus signals */`
288			`device->sigs.pdiago = 0;`
289			`device->sigs.intrq = 0;`
290			`device->sigs.iordy = 0;`
291			`device->sigs.dmarq = 0;`
292
293			`/* set busy bit */`
294			`device->regs.status \|= ATA_SR_BSY;`
295
296			`/* set new state */`
297	1065	rherveille	`device->internals.state = ATA_STATE_SW_RST;`
298	876	rherveille
299			`/* display debug information */`
300			`ata_device_debug(2, "ata_device_sw_reset initiated.\n");`
301			`}`
302			`}`
303	1065	rherveille	`else if (device->internals.state == ATA_STATE_SW_RST)`
304	876	rherveille	`{ /* are we doing a software reset ?? */`
305			`/* SRST bit cleared, end of software reset */`
306
307			`/execute device diagnostics /`
308			`ata_execute_device_diagnostics_cmd(device);`
309
310			`/* clear busy bit */`
311			`device->regs.status &= ~ATA_SR_BSY;`
312
313			`/* set DRDY bit, when not a PACKET device */`
314			`if (!device->packet)`
315			`device->regs.status \|= ATA_SR_DRDY;`
316
317			`/* set new state */`
318	1065	rherveille	`device->internals.state = ATA_STATE_IDLE;`
319	876	rherveille
320			`/* display debug information */`
321			`ata_device_debug(2, "ata_device_sw_reset done.\n");`
322			`}`
323			`/*`
324			`<else> We are doing a hardware reset (or similar)`
325			`ignore command`
326			`*/`
327			`}`
328
329
330			`/*`
331			`D E V I C E S _ D O _ C O M M A N D _ R E G I S T E R`
332			`*/`
333			`void ata_device_do_command_register(ata_device *device)`
334			`{`
335			`/* check BSY & DRQ */`
336			`if ( (device->regs.status & ATA_SR_BSY) \|\| (device->regs.status & ATA_SR_DRQ) )`
337			`if (device->regs.command != DEVICE_RESET)`
338			`MSG_WARNING("ata_device_write, writing a command while BSY or DRQ asserted.");`
339
340			`/* check if device selected */`
341	1065	rherveille	`if ( (device->regs.device_head & ATA_DHR_DEV) == device->internals.dev )`
342	876	rherveille	`ata_device_execute_cmd(device);`
343			`else`
344			`{`
345			`/* if not selected, only respond to EXECUTE DEVICE DIAGNOSTICS */`
346			`if (device->regs.command == EXECUTE_DEVICE_DIAGNOSTICS)`
347			`ata_device_execute_cmd(device);`
348			`}`
349			`}`
350
351
352			`/*`
353			`D E V I C E S _ R E A D`
354			`*/`
355			`/* Read from devices */`
356			`short ata_devices_read(ata_devices *devices, char adr)`
357			`{`
358			`ata_device *device;`
359
360			`/* check for no connected devices */`
361			`if ( (!devices->device0.stream) && (!devices->device1.stream) )`
362	919	rherveille	`MSG_ERROR("ata_devices_read, no ata devices connected.");`
363	876	rherveille	`else`
364			`{`
365			`/* check if both device0 and device1 are connected */`
366			`if ( (devices->device0.stream) && (devices->device1.stream) )`
367			`{`
368			`/* get the current active device */`
369			`if (devices->device1.regs.device_head & ATA_DHR_DEV)`
370			`device = &devices->device1;`
371			`else`
372			`device = &devices->device0;`
373			`}`
374			`else`
375			`{`
376			`/* only one device connected */`
377			`if (devices->device1.stream)`
378			`device = &devices->device1;`
379			`else`
380			`device = &devices->device0;`
381			`}`
382
383			`/* return data provided by selected device */`
384			`switch (adr) {`
385			`case ATA_ASR :`
386	919	rherveille	`ata_device_debug(4, "alternate_status register read\n");`
387	1065	rherveille	`if ( (device->regs.device_head & ATA_DHR_DEV) == device->internals.dev )`
388	876	rherveille	`return device -> regs.status;`
389			`else`
390			`{`
391			`ata_device_debug(2, "device0 responds for device1, asr = 0x00\n");`
392			`return 0; // return 0 when device0 responds for device1`
393			`}`
394
395			`case ATA_CHR :`
396	1065	rherveille	`ata_device_debug(4, "cylinder_high register read, value = 0x%02X\n",`
397	876	rherveille	`device->regs.cylinder_high);`
398			`return device -> regs.cylinder_high;`
399
400			`case ATA_CLR :`
401	1065	rherveille	`ata_device_debug(4, "cylinder_low register read, value = 0x%02X\n",`
402	876	rherveille	`device->regs.cylinder_low);`
403			`return device -> regs.cylinder_low;`
404
405			`case ATA_DR :`
406	1065	rherveille	`if (!device->regs.status & ATA_SR_DRQ)`
407			`{`
408			`ata_device_debug(1, "data register read, while DRQ bit negated\n" );`
409			`return 0;`
410			`}`
411			`else`
412			`{`
413			`ata_device_debug(4, "data register read, value = 0x%04X, cnt = %3d\n",`
414			`*device->internals.dbuf_ptr, device->internals.dbuf_cnt);`
415			`if (!--device->internals.dbuf_cnt)`
416			`device->regs.status &= ~ATA_SR_DRQ;`
417			`return *device -> internals.dbuf_ptr++;`
418			`}`
419	876	rherveille
420			`case ATA_DHR :`
421	1065	rherveille	`ata_device_debug(4, "device_head register read, value = 0x%02X\n",`
422	876	rherveille	`device->regs.device_head);`
423			`return device -> regs.device_head;`
424
425			`case ATA_ERR :`
426	1065	rherveille	`ata_device_debug(4, "error register read, value = 0x%02X\n",`
427	876	rherveille	`device->regs.error);`
428			`return device -> regs.error;`
429
430			`case ATA_SCR :`
431	1065	rherveille	`ata_device_debug(4, "sectorcount register read, value = 0x%02X\n",`
432	876	rherveille	`device->regs.sector_count);`
433			`return device -> regs.sector_count;`
434
435			`case ATA_SNR :`
436	1065	rherveille	`ata_device_debug(4, "sectornumber register read, value = 0x%02X\n",`
437	876	rherveille	`device->regs.sector_number);`
438			`return device -> regs.sector_number;`
439
440			`case ATA_SR :`
441	919	rherveille	`ata_device_debug(4, "status register read\n");`
442	1065	rherveille	`if ( (device->regs.device_head & ATA_DHR_DEV) == device->internals.dev)`
443	876	rherveille	`return device -> regs.status;`
444			`else`
445			`{`
446			`ata_device_debug(2, "device0 responds for device1, sr = 0x00\n");`
447			`return 0; // return 0 when device0 responds for device1`
448			`}`
449
450			`// case ATA_DA :`
451			`// return device -> regs.status;`
452			`}`
453			`}`
454			`}`
455
456
457			`/*`
458			`D E V I C E S _ W R I T E`
459			`*/`
460			`/* Write to devices */`
461			`void ata_devices_write(ata_devices *devices, char adr, short value)`
462			`{`
463			`/* check for no connected devices */`
464			`if (!devices->device0.stream && !devices->device1.stream)`
465	919	rherveille	`MSG_ERROR("ata_devices_write, no ata devices connected.");`
466	876	rherveille	`else`
467			`{`
468			`/* first device */`
469			`if (devices->device0.stream)`
470			`ata_device_write(&devices->device0, adr, value);`
471
472			`/* second device */`
473			`if (devices->device1.stream)`
474			`ata_device_write(&devices->device1, adr, value);`
475			`}`
476			`}`
477
478			`/* write to a single device */`
479			`void ata_device_write(ata_device *device, char adr, short value)`
480			`{`
481			`switch (adr) {`
482			`case ATA_CR :`
483			`/display debug information /`
484	919	rherveille	`ata_device_debug(4, "command register written, value = 0x%02X\n", value);`
485	876	rherveille
486			`device->regs.command = value;`
487
488			`/* check command register settings and execute command */`
489			`ata_device_do_command_register(device);`
490			`break;`
491
492
493			`case ATA_CHR :`
494			`/display debug information /`
495	919	rherveille	`ata_device_debug(4, "cylinder high register written, value = 0x%02X\n", value);`
496	876	rherveille
497			`device->regs.cylinder_high = value;`
498			`break;`
499
500			`case ATA_CLR :`

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