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[/] [openrisc/] [trunk/] [or1ksim/] [peripheral/] [atadevice.c] - Blame information for rev 27

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/* atadevice.c -- ATA Device simulation. Simulates a harddisk, using a local
   streams.
 
   Copyright (C) 2002 Richard Herveille, rherveille@opencores.org
   Copyright (C) 2008 Embecosm Limited
 
   Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>
 
   This file is part of Or1ksim, the 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 3 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, see <http://www.gnu.org/licenses/>.  */
 
/* This program is commented throughout in a fashion suitable for processing
   with Doxygen. */
 
 
/* Autoconf and/or portability configuration */
#include "config.h"
#include "port.h"
 
/* System includes */
#include <byteswap.h>
 
/* Package includes */
#include "atadevice.h"
#include "atadevice-cmdi.h"
#include "atacmd.h"
#include "abstract.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
*/
 
 
/* Use a file to simulate a hard-disk                                 */
static FILE *
open_file (uint32_t * 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+")))
      {
        fprintf (stderr, "Warning: ata_open_file, cannot open hd-file %s\n",
                 filename);
        return NULL;
      }
    else
      {
        /* TODO create a file 'size' large */
        /* create a file 'size' large                                  */
        for (n = 0; n < *size; n++)
          fputc (0, fp);
      }
  else                          /* file already exist                                         */
    fprintf (stderr, "file %s already exists. Using existing file.\n",
             filename);
 
  /* get the size of the file. This is also the size of the harddisk */
  fseek (fp, 0, SEEK_END);
  *size = ftell (fp);
 
  return fp;
}
 
 
/* Use a the local filesystem as a hard-disk                          */
static FILE *
open_local (void)
{
  // TODO:
  fprintf (stderr, "Warning: Device type LOCAL is not yet supported: "
           "Defaulting to device type NO_CONNECT.");
  return NULL;
}
 
static void
ata_device_init (struct ata_device * device, int dev)
{
  /* set DeviceID                                                     */
  device->internals.dev = dev;
 
  /* generate stream for hd_simulation                                */
  switch (device->conf.type)
    {
    case TYPE_NO_CONNECT:
      device->conf.stream = NULL;
      break;
 
    case TYPE_FILE:
      device->conf.stream = open_file (&device->conf.size, device->conf.file);
      break;
 
    case TYPE_LOCAL:
      device->conf.stream = open_local ();
      break;
 
    default:
      fprintf (stderr, "Warning: Illegal device-type %d: "
               "Defaulting to type NO_CONNECT.\n", device->conf.type);
      device->conf.stream = NULL;
      break;
    }
 
  device->conf.size_sect = device->conf.size / BYTES_PER_SECTOR;
}
 
/*
  D E V I C E S _ I N I T
*/
void
ata_devices_init (struct ata_devices * devices)
{
  ata_device_init (&devices->device[0], 0);
 
  if (devices->device[0].conf.type)
    ata_device_init (&devices->device[1], ATA_DHR_DEV);
  else
    ata_device_init (&devices->device[1], 0);
}
 
/*
  D E V I C E S _ H W _ R E S E T
*/
static void
ata_device_hw_reset (struct 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 = device->conf.sectors;
          device->internals.heads_per_cylinder = device->conf.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->conf.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;
 
      /* set new state                                              */
      device->internals.state = ATA_STATE_HW_RST;
    }
}
 
/* power-on and hardware reset                                        */
void
ata_devices_hw_reset (struct ata_devices * devices, int reset_signal)
{
  /* find device 0                                                    */
  if ((devices->device[0].conf.stream) && (devices->device[1].conf.stream))
    {
      /* this one is simple, device0 is device0                         */
 
      /* 1) handle device1 first                                        */
      ata_device_hw_reset (&devices->device[1], 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->device[0], reset_signal,
                           0,
                           devices->device[1].sigs.pdiago,
                           devices->device[1].sigs.daspo);
    }
  else if (devices->device[0].conf.stream)
    {
      /* device0 is device0, there's no device1                         */
      ata_device_hw_reset (&devices->device[0], 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->device[1].conf.stream)
    {
      /* device1 is (logical) device0, there's no (physical) device0    */
      ata_device_hw_reset (&devices->device[1], reset_signal, 0, /* negate dasp, this is device0          */
                           0,    /* negate pdiag input, there's no device1 */
                           0);   /* negate dasp input, there's no device1 */
    }
}
 
 
/*
  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
*/
static void
ata_device_do_control_register (struct 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;
        }
    }
  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->conf.packet)
        device->regs.status |= ATA_SR_DRDY;
 
      /* set new state                                                */
      device->internals.state = ATA_STATE_IDLE;
    }
  /*
     <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
*/
static void
ata_device_do_command_register (struct 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)
        {
          fprintf (stderr, "Warning: ata_device_write, writing a command "
                   "while BSY or DRQ asserted.\n");
        }
    }
 
  /* 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 (struct ata_devices * devices, char adr)
{
  struct ata_device *device;
 
  /* check for no connected devices                                 */
  if ((!devices->device[0].conf.stream) && (!devices->device[1].conf.stream))
    {
      fprintf (stderr, "Warning: ata_devices_read, no ata devices "
               "connected.\n");
    }
  else
    {
      /* check if both device0 and device1 are connected              */
      if ((devices->device[0].conf.stream)
          && (devices->device[1].conf.stream))
        {
          /* get the current active device                            */
          if (devices->device[1].regs.device_head & ATA_DHR_DEV)
            device = &devices->device[1];
          else
            device = &devices->device[0];
        }
      else
        {
          /* only one device connected                                */
          if (devices->device[1].conf.stream)
            device = &devices->device[1];
          else
            device = &devices->device[0];
        }
 
      /* return data provided by selected device                      */
      switch (adr)
        {
        case ATA_ASR:
          if ((device->regs.device_head & ATA_DHR_DEV) ==
              device->internals.dev)
            return device->regs.status;
          else
            {
              return 0;          // return 0 when device0 responds for device1
            }
 
        case ATA_CHR:
          return device->regs.cylinder_high;
 
        case ATA_CLR:
          return device->regs.cylinder_low;
 
        case ATA_DR:
          if (!device->regs.status & ATA_SR_DRQ)
            {
              return 0;
            }
          else
            {
              uint16_t val = LE16 (*device->internals.dbuf_ptr++);
              if (!--device->internals.dbuf_cnt)
                {
                  device->regs.status &= ~ATA_SR_DRQ;
                  if (device->internals.end_t_func)
                    device->internals.end_t_func (device);
                }
              return val;
            }
 
        case ATA_DHR:
          return device->regs.device_head;
 
        case ATA_ERR:
          return device->regs.error;
 
        case ATA_SCR:
          return device->regs.sector_count;
 
        case ATA_SNR:
          return device->regs.sector_number;
 
        case ATA_SR:
          if ((device->regs.device_head & ATA_DHR_DEV) ==
              device->internals.dev)
            {
              device->sigs.intrq = 0;
              return device->regs.status;
            }
 
          return 0;              // return 0 when device0 responds for device1
 
//        case ATA_DA   :
//          return device -> regs.status;
        }
    }
  return 0;
}
 
 
/*
  D E V I C E S _ W R I T E
*/
/* write to a single device                                           */
static void
ata_device_write (struct ata_device * device, char adr, short value)
{
  switch (adr)
    {
    case ATA_CR:
      device->regs.command = value;
 
      /* check command register settings and execute command    */
      ata_device_do_command_register (device);
      break;
 
 
    case ATA_CHR:
      device->regs.cylinder_high = value;
      break;
 
    case ATA_CLR:
      device->regs.cylinder_low = value;
      break;
 
    case ATA_DR:
      if (!device->regs.status & ATA_SR_DRQ)
        {
          break;
        }
      else
        {
          *device->internals.dbuf_ptr++ = LE16 (value);
          if (!--device->internals.dbuf_cnt)
            {
              device->regs.status &= ~ATA_SR_DRQ;
              if (device->internals.end_t_func)
                device->internals.end_t_func (device);
            }
        }
      device->regs.dataport_i = value;
      break;
 
    case ATA_DCR:
      device->regs.device_control = value;
      ata_device_do_control_register (device);
      break;
 
    case ATA_DHR:
      device->regs.device_head = value;
      break;
 
    case ATA_FR:
      device->regs.features = value;
      break;
 
    case ATA_SCR:
      device->regs.sector_count = value;
      break;
 
    case ATA_SNR:
      device->regs.sector_number = value;
      break;
 
    }                           //endcase
}
 
/* Write to devices                                                   */
void
ata_devices_write (struct ata_devices * devices, char adr, short value)
{
  /* check for no connected devices                                 */
  if (!devices->device[0].conf.stream && !devices->device[1].conf.stream)
    {
      fprintf (stderr, "Warning: ata_devices_write, no ata devices "
               "connected.\n");
    }
  else
    {
      /* first device                                                 */
      if (devices->device[0].conf.stream)
        ata_device_write (&devices->device[0], adr, value);
 
      /* second device                                                */
      if (devices->device[1].conf.stream)
        ata_device_write (&devices->device[1], adr, value);
    }
}

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[/] [openrisc/] [trunk/] [or1ksim/] [peripheral/] [atadevice.c] - Blame information for rev 27

Line No.	Rev	Author	Line
1	19	jeremybenn	`/* atadevice.c -- ATA Device simulation. Simulates a harddisk, using a local`
2			`streams.`
3
4			`Copyright (C) 2002 Richard Herveille, rherveille@opencores.org`
5			`Copyright (C) 2008 Embecosm Limited`
6
7			`Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>`
8
9			`This file is part of Or1ksim, the OpenRISC 1000 Architectural Simulator.`
10
11			`This program is free software; you can redistribute it and/or modify it`
12			`under the terms of the GNU General Public License as published by the Free`
13			`Software Foundation; either version 3 of the License, or (at your option)`
14			`any later version.`
15
16			`This program is distributed in the hope that it will be useful, but WITHOUT`
17			`ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or`
18			`FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for`
19			`more details.`
20
21			`You should have received a copy of the GNU General Public License along`
22			`with this program. If not, see <http://www.gnu.org/licenses/>. */`
23
24			`/* This program is commented throughout in a fashion suitable for processing`
25			`with Doxygen. */`
26
27
28			`/* Autoconf and/or portability configuration */`
29			`#include "config.h"`
30			`#include "port.h"`
31
32			`/* System includes */`
33			`#include <byteswap.h>`
34
35			`/* Package includes */`
36			`#include "atadevice.h"`
37			`#include "atadevice-cmdi.h"`
38			`#include "atacmd.h"`
39			`#include "abstract.h"`
40
41
42			`/*`
43			`mandatory commands:`
44			`- execute device diagnostics (done)`
45			`- flush cache`
46			`- identify device (done)`
47			`- initialize device parameters (done)`
48			`- read dma`
49			`- read multiple`
50			`- read sector(s) (done)`
51			`- 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			`/* Use a file to simulate a hard-disk */`
73			`static FILE *`
74			`open_file (uint32_t * size, const char *filename)`
75			`{`
76			`FILE *fp;`
77			`unsigned long n;`
78
79			`// TODO:`
80
81			`/* check if a file with name 'filename' already exists */`
82			`if (!(fp = fopen (filename, "rb+")))`
83			`if (!(fp = fopen (filename, "wb+")))`
84			`{`
85			`fprintf (stderr, "Warning: ata_open_file, cannot open hd-file %s\n",`
86			`filename);`
87			`return NULL;`
88			`}`
89			`else`
90			`{`
91			`/* TODO create a file 'size' large */`
92			`/* create a file 'size' large */`
93			`for (n = 0; n < *size; n++)`
94			`fputc (0, fp);`
95			`}`
96			`else /* file already exist */`
97			`fprintf (stderr, "file %s already exists. Using existing file.\n",`
98			`filename);`
99
100			`/* get the size of the file. This is also the size of the harddisk */`
101			`fseek (fp, 0, SEEK_END);`
102			`*size = ftell (fp);`
103
104			`return fp;`
105			`}`
106
107
108			`/* Use a the local filesystem as a hard-disk */`
109			`static FILE *`
110			`open_local (void)`
111			`{`
112			`// TODO:`
113			`fprintf (stderr, "Warning: Device type LOCAL is not yet supported: "`
114			`"Defaulting to device type NO_CONNECT.");`
115			`return NULL;`
116			`}`
117
118			`static void`
119			`ata_device_init (struct ata_device * device, int dev)`
120			`{`
121			`/* set DeviceID */`
122			`device->internals.dev = dev;`
123
124			`/* generate stream for hd_simulation */`
125			`switch (device->conf.type)`
126			`{`
127			`case TYPE_NO_CONNECT:`
128			`device->conf.stream = NULL;`
129			`break;`
130
131			`case TYPE_FILE:`
132			`device->conf.stream = open_file (&device->conf.size, device->conf.file);`
133			`break;`
134
135			`case TYPE_LOCAL:`
136			`device->conf.stream = open_local ();`
137			`break;`
138
139			`default:`
140			`fprintf (stderr, "Warning: Illegal device-type %d: "`
141			`"Defaulting to type NO_CONNECT.\n", device->conf.type);`
142			`device->conf.stream = NULL;`
143			`break;`
144			`}`
145
146			`device->conf.size_sect = device->conf.size / BYTES_PER_SECTOR;`
147			`}`
148
149			`/*`
150			`D E V I C E S _ I N I T`
151			`*/`
152			`void`
153			`ata_devices_init (struct ata_devices * devices)`
154			`{`
155			`ata_device_init (&devices->device[0], 0);`
156
157			`if (devices->device[0].conf.type)`
158			`ata_device_init (&devices->device[1], ATA_DHR_DEV);`
159			`else`
160			`ata_device_init (&devices->device[1], 0);`
161			`}`
162
163			`/*`
164			`D E V I C E S _ H W _ R E S E T`
165			`*/`
166			`static void`
167			`ata_device_hw_reset (struct ata_device * device, int reset_signal,`
168			`int daspo, int pdiagi, int daspi)`
169			`{`
170			`/* check ata-device state */`
171			`if (device->internals.state == ATA_STATE_HW_RST)`
172			`{`
173			`if (!reset_signal)`
174			`{`
175			`/* hardware reset finished */`
176
177			`/* set sectors_per_track & heads_per_cylinders */`
178			`device->internals.sectors_per_track = device->conf.sectors;`
179			`device->internals.heads_per_cylinder = device->conf.heads;`
180
181			`/* set device1 input signals */`
182			`device->sigs.pdiagi = pdiagi;`
183			`device->sigs.daspi = daspi;`
184
185			`ata_execute_device_diagnostics_cmd (device);`
186
187			`/* clear busy bit */`
188			`device->regs.status &= ~ATA_SR_BSY;`
189
190			`/* set DRDY bit, when not a PACKET device */`
191			`if (!device->conf.packet)`
192			`device->regs.status \|= ATA_SR_DRDY;`
193
194			`/* set new state */`
195			`device->internals.state = ATA_STATE_IDLE;`
196			`}`
197			`}`
198			`else if (reset_signal)`
199			`{`
200			`/* hardware reset signal asserted, stop what we are doing */`
201
202			`/* negate bus signals */`
203			`device->sigs.iordy = 0;`
204			`device->sigs.intrq = 0;`
205			`device->sigs.dmarq = 0;`
206			`device->sigs.pdiago = 0;`
207			`device->sigs.daspo = daspo;`
208
209			`/* set busy bit */`
210			`device->regs.status \|= ATA_SR_BSY;`
211
212			`/* set new state */`
213			`device->internals.state = ATA_STATE_HW_RST;`
214			`}`
215			`}`
216
217			`/* power-on and hardware reset */`
218			`void`
219			`ata_devices_hw_reset (struct ata_devices * devices, int reset_signal)`
220			`{`
221			`/* find device 0 */`
222			`if ((devices->device[0].conf.stream) && (devices->device[1].conf.stream))`
223			`{`
224			`/* this one is simple, device0 is device0 */`
225
226			`/* 1) handle device1 first */`
227			`ata_device_hw_reset (&devices->device[1], reset_signal, 1, /* assert dasp, this is device1 */`
228			`0, /* negate pdiag input, no more devices */`
229			`0); /* negate dasp input, no more devices */`
230
231			`/* 2) Then handle device0 */`
232			`ata_device_hw_reset (&devices->device[0], reset_signal,`
233			`0,`
234			`devices->device[1].sigs.pdiago,`
235			`devices->device[1].sigs.daspo);`
236			`}`
237			`else if (devices->device[0].conf.stream)`
238			`{`
239			`/* device0 is device0, there's no device1 */`
240			`ata_device_hw_reset (&devices->device[0], reset_signal, 0, /* negate dasp, this is device0 */`
241			`0, /* negate pdiag input, there's no device1 */`
242			`0); /* negate dasp input, there's no device1 */`
243			`}`
244			`else if (devices->device[1].conf.stream)`
245			`{`
246			`/* device1 is (logical) device0, there's no (physical) device0 */`
247			`ata_device_hw_reset (&devices->device[1], reset_signal, 0, /* negate dasp, this is device0 */`
248			`0, /* negate pdiag input, there's no device1 */`
249			`0); /* negate dasp input, there's no device1 */`
250			`}`
251			`}`
252
253
254			`/*`
255			`D E V I C E S _ D O _ C O N T R O L _ R E G I S T E R`
256
257			`Handles - software reset`
258			`- Interrupt enable bit`
259			`*/`
260			`static void`
261			`ata_device_do_control_register (struct ata_device * device)`
262			`{`
263			`/* TODO respond to new values of nIEN */`
264			`/* if device not selected, respond to new values of nIEN & SRST */`
265
266			`/* check if SRST bit is set */`
267			`if (device->regs.device_control & ATA_DCR_RST)`
268			`{`
269			`if (device->internals.state == ATA_STATE_IDLE)`
270			`{ /* start software reset */`
271			`/* negate bus signals */`
272			`device->sigs.pdiago = 0;`
273			`device->sigs.intrq = 0;`
274			`device->sigs.iordy = 0;`
275			`device->sigs.dmarq = 0;`
276
277			`/* set busy bit */`
278			`device->regs.status \|= ATA_SR_BSY;`
279
280			`/* set new state */`
281			`device->internals.state = ATA_STATE_SW_RST;`
282			`}`
283			`}`
284			`else if (device->internals.state == ATA_STATE_SW_RST)`
285			`{ /* are we doing a software reset ?? */`
286			`/* SRST bit cleared, end of software reset */`
287
288			`/execute device diagnostics /`
289			`ata_execute_device_diagnostics_cmd (device);`
290
291			`/* clear busy bit */`
292			`device->regs.status &= ~ATA_SR_BSY;`
293
294			`/* set DRDY bit, when not a PACKET device */`
295			`if (!device->conf.packet)`
296			`device->regs.status \|= ATA_SR_DRDY;`
297
298			`/* set new state */`
299			`device->internals.state = ATA_STATE_IDLE;`
300			`}`
301			`/*`
302			`<else> We are doing a hardware reset (or similar)`
303			`ignore command`
304			`*/`
305			`}`
306
307
308			`/*`
309			`D E V I C E S _ D O _ C O M M A N D _ R E G I S T E R`
310			`*/`
311			`static void`
312			`ata_device_do_command_register (struct ata_device * device)`
313			`{`
314			`/* check BSY & DRQ */`
315			`if ((device->regs.status & ATA_SR_BSY)`
316			`\|\| (device->regs.status & ATA_SR_DRQ))`
317			`{`
318			`if (device->regs.command != DEVICE_RESET)`
319			`{`
320			`fprintf (stderr, "Warning: ata_device_write, writing a command "`
321			`"while BSY or DRQ asserted.\n");`
322			`}`
323			`}`
324
325			`/* check if device selected */`
326			`if ((device->regs.device_head & ATA_DHR_DEV) == device->internals.dev)`
327			`ata_device_execute_cmd (device);`
328			`else`
329			`{`
330			`/* if not selected, only respond to EXECUTE DEVICE DIAGNOSTICS */`
331			`if (device->regs.command == EXECUTE_DEVICE_DIAGNOSTICS)`
332			`ata_device_execute_cmd (device);`
333			`}`
334			`}`
335
336
337			`/*`
338			`D E V I C E S _ R E A D`
339			`*/`
340			`/* Read from devices */`
341			`short`
342			`ata_devices_read (struct ata_devices * devices, char adr)`
343			`{`
344			`struct ata_device *device;`
345
346			`/* check for no connected devices */`
347			`if ((!devices->device[0].conf.stream) && (!devices->device[1].conf.stream))`
348			`{`
349			`fprintf (stderr, "Warning: ata_devices_read, no ata devices "`
350			`"connected.\n");`
351			`}`
352			`else`
353			`{`
354			`/* check if both device0 and device1 are connected */`
355			`if ((devices->device[0].conf.stream)`
356			`&& (devices->device[1].conf.stream))`
357			`{`
358			`/* get the current active device */`
359			`if (devices->device[1].regs.device_head & ATA_DHR_DEV)`
360			`device = &devices->device[1];`
361			`else`
362			`device = &devices->device[0];`
363			`}`
364			`else`
365			`{`
366			`/* only one device connected */`
367			`if (devices->device[1].conf.stream)`
368			`device = &devices->device[1];`
369			`else`
370			`device = &devices->device[0];`
371			`}`
372
373			`/* return data provided by selected device */`
374			`switch (adr)`
375			`{`
376			`case ATA_ASR:`
377			`if ((device->regs.device_head & ATA_DHR_DEV) ==`
378			`device->internals.dev)`
379			`return device->regs.status;`
380			`else`
381			`{`
382			`return 0; // return 0 when device0 responds for device1`
383			`}`
384
385			`case ATA_CHR:`
386			`return device->regs.cylinder_high;`
387
388			`case ATA_CLR:`
389			`return device->regs.cylinder_low;`
390
391			`case ATA_DR:`
392			`if (!device->regs.status & ATA_SR_DRQ)`
393			`{`
394			`return 0;`
395			`}`
396			`else`
397			`{`
398			`uint16_t val = LE16 (*device->internals.dbuf_ptr++);`
399			`if (!--device->internals.dbuf_cnt)`
400			`{`
401			`device->regs.status &= ~ATA_SR_DRQ;`
402			`if (device->internals.end_t_func)`
403			`device->internals.end_t_func (device);`
404			`}`
405			`return val;`
406			`}`
407
408			`case ATA_DHR:`
409			`return device->regs.device_head;`
410
411			`case ATA_ERR:`
412			`return device->regs.error;`
413
414			`case ATA_SCR:`
415			`return device->regs.sector_count;`
416
417			`case ATA_SNR:`
418			`return device->regs.sector_number;`
419
420			`case ATA_SR:`
421			`if ((device->regs.device_head & ATA_DHR_DEV) ==`
422			`device->internals.dev)`
423			`{`
424			`device->sigs.intrq = 0;`
425			`return device->regs.status;`
426			`}`
427
428			`return 0; // return 0 when device0 responds for device1`
429
430			`// case ATA_DA :`
431			`// return device -> regs.status;`
432			`}`
433			`}`
434			`return 0;`
435			`}`
436
437
438			`/*`
439			`D E V I C E S _ W R I T E`
440			`*/`
441			`/* write to a single device */`
442			`static void`
443			`ata_device_write (struct ata_device * device, char adr, short value)`
444			`{`
445			`switch (adr)`
446			`{`
447			`case ATA_CR:`
448			`device->regs.command = value;`
449
450			`/* check command register settings and execute command */`
451			`ata_device_do_command_register (device);`
452			`break;`
453
454
455			`case ATA_CHR:`
456			`device->regs.cylinder_high = value;`
457			`break;`
458
459			`case ATA_CLR:`
460			`device->regs.cylinder_low = value;`
461			`break;`
462
463			`case ATA_DR:`
464			`if (!device->regs.status & ATA_SR_DRQ)`
465			`{`
466			`break;`
467			`}`
468			`else`
469			`{`
470			`*device->internals.dbuf_ptr++ = LE16 (value);`
471			`if (!--device->internals.dbuf_cnt)`
472			`{`
473			`device->regs.status &= ~ATA_SR_DRQ;`
474			`if (device->internals.end_t_func)`
475			`device->internals.end_t_func (device);`
476			`}`
477			`}`
478			`device->regs.dataport_i = value;`
479			`break;`
480
481			`case ATA_DCR:`
482			`device->regs.device_control = value;`
483			`ata_device_do_control_register (device);`
484			`break;`
485
486			`case ATA_DHR:`
487			`device->regs.device_head = value;`
488			`break;`
489
490			`case ATA_FR:`
491			`device->regs.features = value;`
492			`break;`
493
494			`case ATA_SCR:`
495			`device->regs.sector_count = value;`
496			`break;`
497
498			`case ATA_SNR:`
499			`device->regs.sector_number = value;`
500			`break;`
501
502			`} //endcase`
503			`}`
504
505			`/* Write to devices */`
506			`void`
507			`ata_devices_write (struct ata_devices * devices, char adr, short value)`
508			`{`
509			`/* check for no connected devices */`
510			`if (!devices->device[0].conf.stream && !devices->device[1].conf.stream)`
511			`{`
512			`fprintf (stderr, "Warning: ata_devices_write, no ata devices "`
513			`"connected.\n");`
514			`}`
515			`else`
516			`{`
517			`/* first device */`
518			`if (devices->device[0].conf.stream)`
519			`ata_device_write (&devices->device[0], adr, value);`
520
521			`/* second device */`
522			`if (devices->device[1].conf.stream)`
523			`ata_device_write (&devices->device[1], adr, value);`
524			`}`
525			`}`