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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 "atadevice.h"
#include "atacmd.h"
#include "sim-config.h"
#include "atadevice_cmdi.h"
 
#include "debug.h"
 
DEFAULT_DEBUG_CHANNEL(ata);
 
/*
 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+"))) {
       ERR("ata_open_file, cannot open hd-file %s\n", filename);
       return NULL;
     } else {
       /* TODO create a file 'size' large */
       /* create a file 'size' large                                  */
       TRACE("ata_device; generating a new hard disk file.\n");
       TRACE("This may take a while, depending on the requested size.\n");
       for(n=0; n < *size; n++)
         fputc(0, fp);
     }
   else /* file already exist                                         */
     fprintf(stderr, "file %s already exists. Using existing file.\n", filename);
 
   TRACE("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);
 
   TRACE("actual filesize is: %d (MBytes).\n", *size >> 20);
 
   return fp;
}
 
 
/* Use a the local filesystem as a hard-disk                          */
static FILE *open_local(void)
{
  // TODO:
  FIXME("Device type LOCAL is not yet supported. Defaulting to device type NO_CONNECT.");
  return NULL;
}
 
static 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:
      TRACE("ata_device, using type NO_CONNECT.\n");
      device->stream = NULL;
      break;
 
    case TYPE_FILE:
      TRACE("ata_device, using device type FILE.\n");
      device->stream = open_file(&device->size, device->file);
      break;
 
    case TYPE_LOCAL:
      TRACE("ata_device, using device type LOCAL.\n");
      device->stream = open_local();
      break;
 
    default:
      ERR("Illegal device-type.  Defaulting to type NO_CONNECT.\n");
      device->stream = NULL;
      break;
  }
}
 
/*
  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);
}
 
/*
  D E V I C E S _ H W _ R E S E T
*/
static 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;
 
    /* set new state                                              */
    device->internals.state = ATA_STATE_HW_RST;
  }
}
 
/* power-on and hardware reset                                        */
void ata_devices_hw_reset(ata_devices *devices, int reset_signal)
{
  /* display debug information                                        */
  TRACE("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                                           */
    TRACE("ata_device_hw_reset, no devices connected.\n");
  }
}
 
 
/*
  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                                  */
        TRACE("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                                    */
      TRACE("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)
        WARN("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) )
        ERR("ata_devices_read, no ata devices connected.\n");
    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 :
          TRACE("alternate_status register read\n");
          if ( (device->regs.device_head & ATA_DHR_DEV) ==  device->internals.dev )
              return device -> regs.status;
          else
          {
              TRACE("device0 responds for device1, asr = 0x00\n");
              return 0; // return 0 when device0 responds for device1
          }
 
        case ATA_CHR :
          TRACE("cylinder_high register read, value = 0x%02X\n",
                device->regs.cylinder_high);
          return device -> regs.cylinder_high;
 
        case ATA_CLR :
          TRACE("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)
          {
             TRACE("data register read, while DRQ bit negated\n" );
             return 0;
          }
          else
          {
              TRACE("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 :
          TRACE("device_head register read, value = 0x%02X\n",
                 device->regs.device_head);
          return device -> regs.device_head;
 
        case ATA_ERR :
          TRACE("error register read, value = 0x%02X\n",
                 device->regs.error);
          return device -> regs.error;
 
        case ATA_SCR :
          TRACE("sectorcount register read, value = 0x%02X\n",
                 device->regs.sector_count);
          return device -> regs.sector_count;
 
        case ATA_SNR :
          TRACE("sectornumber register read, value = 0x%02X\n",
                 device->regs.sector_number);
          return device -> regs.sector_number;
 
        case ATA_SR  :
          TRACE("status register read\n");
          if ( (device->regs.device_head & ATA_DHR_DEV) ==  device->internals.dev)
              return device -> regs.status;
          else
          {
              TRACE("device0 responds for device1, sr = 0x00\n");
              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(ata_device *device, char adr, short value)
{
    switch (adr) {
        case ATA_CR  :
            /*display debug information                               */
            TRACE("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                               */
            TRACE("cylinder high register written, value = 0x%02X\n", value);
 
            device->regs.cylinder_high = value;
            break;
 
        case ATA_CLR :
            /*display debug information                               */
            TRACE("cylinder low register written, value = 0x%02X\n", value);
 
            device->regs.cylinder_low = value;
            break;
 
        case ATA_DR :
            /*display debug information                               */
            TRACE("data register written, value = 0x%04X\n", value);
 
            device->regs.dataport_i = value;
            break;
 
        case ATA_DCR :
            /*display debug information                               */
            TRACE("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                               */
            TRACE("device head register written, value = 0x%02X\n", value);
 
            device->regs.device_head = value;
            break;
 
        case ATA_FR  :
            /*display debug information                               */
            TRACE("features register written, value = 0x%02X\n", value);
 
            device->regs.features = value;
            break;
 
        case ATA_SCR :
            /*display debug information                               */
            TRACE("sectorcount register written, value = 0x%02X\n", value);
 
            device->regs.sector_count = value;
            break;
 
        case ATA_SNR :
            /*display debug information                               */
            TRACE("sectornumber register written, value = 0x%02X\n", value);
 
            device->regs.sector_number = value;
            break;
 
    } //endcase
}
 
/* 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)
    ERR("ata_devices_write, no ata devices connected.\n");
  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);
  }
}
 

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 "atadevice.h"`
37			`#include "atacmd.h"`
38			`#include "sim-config.h"`
39			`#include "atadevice_cmdi.h"`
40
41	1488	nogj	`#include "debug.h"`
42
43			`DEFAULT_DEBUG_CHANNEL(ata);`
44
45	876	rherveille	`/*`
46			`mandatory commands:`
47	919	rherveille	`- execute device diagnostics (done)`
48	876	rherveille	`- flush cache`
49	919	rherveille	`- identify device (done)`
50			`- initialize device parameters (done)`
51	876	rherveille	`- read dma`
52			`- read multiple`
53	919	rherveille	`- read sector(s) (done)`
54	876	rherveille	`- read verify sector(s)`
55			`- seek`
56			`- set features`
57			`- set multiple mode`
58			`- write dma`
59			`- write multiple`
60			`- write sector(s)`
61
62
63			`optional commands:`
64			`- download microcode`
65			`- nop`
66			`- read buffer`
67			`- write buffer`
68
69
70			`prohibited commands:`
71			`- device reset`
72			`*/`
73
74
75	1693	nogj	`/* Use a file to simulate a hard-disk */`
76			`static FILE open_file(uint32_t size, const char *filename)`
77	876	rherveille	`{`
78	1693	nogj	`FILE *fp;`
79			`unsigned long n;`
80	876	rherveille
81	1693	nogj	`// TODO:`
82
83			`/* check if a file with name 'filename' already exists */`
84			`if(!(fp = fopen(filename, "rb+")))`
85			`if(!(fp = fopen(filename, "wb+"))) {`
86			`ERR("ata_open_file, cannot open hd-file %s\n", filename);`
87			`return NULL;`
88			`} else {`
89			`/* TODO create a file 'size' large */`
90			`/* create a file 'size' large */`
91			`TRACE("ata_device; generating a new hard disk file.\n");`
92			`TRACE("This may take a while, depending on the requested size.\n");`
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", filename);`
98
99			`TRACE("requested filesize was: %d (MBytes).\n", *size);`
100
101			`/* get the size of the file. This is also the size of the harddisk*/`
102			`fseek(fp, 0, SEEK_END);`
103			`*size = ftell(fp);`
104
105			`TRACE("actual filesize is: %d (MBytes).\n", *size >> 20);`
106
107			`return fp;`
108	876	rherveille	`}`
109
110
111	1693	nogj	`/* Use a the local filesystem as a hard-disk */`
112			`static FILE *open_local(void)`
113	876	rherveille	`{`
114	1693	nogj	`// TODO:`
115			`FIXME("Device type LOCAL is not yet supported. Defaulting to device type NO_CONNECT.");`
116			`return NULL;`
117			`}`
118
119			`static void ata_device_init(ata_device *device, int dev)`
120			`{`
121	876	rherveille	`/* set DeviceID */`
122	1065	rherveille	`device->internals.dev = dev;`
123	876	rherveille
124			`/* generate stream for hd_simulation */`
125			`switch(device->type)`
126			`{`
127			`case TYPE_NO_CONNECT:`
128	1488	nogj	`TRACE("ata_device, using type NO_CONNECT.\n");`
129	876	rherveille	`device->stream = NULL;`
130			`break;`
131
132			`case TYPE_FILE:`
133	1488	nogj	`TRACE("ata_device, using device type FILE.\n");`
134	1364	nogj	`device->stream = open_file(&device->size, device->file);`
135	876	rherveille	`break;`
136
137			`case TYPE_LOCAL:`
138	1488	nogj	`TRACE("ata_device, using device type LOCAL.\n");`
139	876	rherveille	`device->stream = open_local();`
140			`break;`
141
142			`default:`
143	1488	nogj	`ERR("Illegal device-type. Defaulting to type NO_CONNECT.\n");`
144	876	rherveille	`device->stream = NULL;`
145			`break;`
146			`}`
147			`}`
148
149	1693	nogj	`/*`
150			`D E V I C E S _ I N I T`
151			`*/`
152			`void ata_devices_init(ata_devices *devices)`
153	876	rherveille	`{`
154	1693	nogj	`ata_device_init(&devices->device0, 0);`
155	876	rherveille
156	1693	nogj	`if(devices->device0.type)`
157			`ata_device_init(&devices->device1, ATA_DHR_DEV);`
158			`else`
159			`ata_device_init(&devices->device1, 0);`
160			`}`
161	876	rherveille
162	1693	nogj	`/*`
163			`D E V I C E S _ H W _ R E S E T`
164			`*/`
165			`static void ata_device_hw_reset(ata_device *device, int reset_signal,`
166			`int daspo, int pdiagi, int daspi)`
167			`{`
168			`/* check ata-device state */`
169			`if(device->internals.state == ATA_STATE_HW_RST) {`
170			`if(!reset_signal) {`
171			`/* hardware reset finished */`
172	876	rherveille
173	1693	nogj	`/* set sectors_per_track & heads_per_cylinders */`
174			`device->internals.sectors_per_track = SECTORS;`
175			`device->internals.heads_per_cylinder = HEADS;`
176	876	rherveille
177	1693	nogj	`/* set device1 input signals */`
178			`device->sigs.pdiagi = pdiagi;`
179			`device->sigs.daspi = daspi;`
180	876	rherveille
181	1693	nogj	`ata_execute_device_diagnostics_cmd(device);`
182	876	rherveille
183	1693	nogj	`/* clear busy bit */`
184			`device->regs.status &= ~ATA_SR_BSY;`
185	876	rherveille
186	1693	nogj	`/* set DRDY bit, when not a PACKET device */`
187			`if(!device->packet)`
188			`device->regs.status \|= ATA_SR_DRDY;`
189	876	rherveille
190	1693	nogj	`/* set new state */`
191			`device->internals.state = ATA_STATE_IDLE;`
192			`}`
193			`} else if (reset_signal) {`
194			`/* hardware reset signal asserted, stop what we are doing */`
195	876	rherveille
196	1693	nogj	`/* negate bus signals */`
197			`device->sigs.iordy = 0;`
198			`device->sigs.intrq = 0;`
199			`device->sigs.dmarq = 0;`
200			`device->sigs.pdiago = 0;`
201			`device->sigs.daspo = daspo;`
202	876	rherveille
203	1693	nogj	`/* set busy bit */`
204			`device->regs.status \|= ATA_SR_BSY;`
205	876	rherveille
206	1693	nogj	`/* set new state */`
207			`device->internals.state = ATA_STATE_HW_RST;`
208			`}`
209			`}`
210	876	rherveille
211			`/* power-on and hardware reset */`
212			`void ata_devices_hw_reset(ata_devices *devices, int reset_signal)`
213			`{`
214			`/* display debug information */`
215	1488	nogj	`TRACE("ata_devices_hw_reset.\n");`
216	876	rherveille
217			`/* find device 0 */`
218			`if ( (devices->device0.stream) && (devices->device1.stream) )`
219			`{`
220			`/* this one is simple, device0 is device0 */`
221
222			`/* 1) handle device1 first */`
223	1065	rherveille	`ata_device_hw_reset(&devices->device1, reset_signal,`
224			`1, /* assert dasp, this is device1 */`
225			`0, /* negate pdiag input, no more devices */`
226	876	rherveille	`0); /* negate dasp input, no more devices */`
227
228			`/* 2) Then handle device0 */`
229	1065	rherveille	`ata_device_hw_reset(&devices->device0, reset_signal,`
230			`0,`
231			`devices->device1.sigs.pdiago,`
232	876	rherveille	`devices->device1.sigs.daspo);`
233			`}`
234			`else if (devices->device0.stream)`
235			`{`
236			`/* device0 is device0, there's no device1 */`
237	1065	rherveille	`ata_device_hw_reset(&devices->device0, reset_signal,`
238			`0, /* negate dasp, this is device0 */`
239			`0, /* negate pdiag input, there's no device1*/`
240	876	rherveille	`0); /* negate dasp input, there's no device1 */`
241			`}`
242			`else if (devices->device1.stream)`
243			`{`
244			`/* device1 is (logical) device0, there's no (physical) device0 */`
245	1065	rherveille	`ata_device_hw_reset(&devices->device1, reset_signal,`
246			`0, /* negate dasp, this is device0 */`
247			`0, /* negate pdiag input, there's no device1*/`
248	876	rherveille	`0); /* negate dasp input, there's no device1 */`
249			`}`
250			`else`
251			`{`
252			`/* no devices connected */`
253	1488	nogj	`TRACE("ata_device_hw_reset, no devices connected.\n");`
254	876	rherveille	`}`
255			`}`
256
257	1065	rherveille
258	876	rherveille	`/*`
259			`D E V I C E S _ D O _ C O N T R O L _ R E G I S T E R`
260
261			`Handles - software reset`
262			`- Interrupt enable bit`
263			`*/`
264			`void ata_device_do_control_register(ata_device *device)`
265			`{`
266			`/* TODO respond to new values of nIEN */`
267			`/* if device not selected, respond to new values of nIEN & SRST */`
268
269			`/* check if SRST bit is set */`
270			`if (device->regs.device_control & ATA_DCR_RST)`
271			`{`
272	1065	rherveille	`if (device->internals.state == ATA_STATE_IDLE)`
273	876	rherveille	`{ /* start software reset */`
274			`/* negate bus signals */`
275			`device->sigs.pdiago = 0;`
276			`device->sigs.intrq = 0;`
277			`device->sigs.iordy = 0;`
278			`device->sigs.dmarq = 0;`
279
280			`/* set busy bit */`
281			`device->regs.status \|= ATA_SR_BSY;`
282
283			`/* set new state */`
284	1065	rherveille	`device->internals.state = ATA_STATE_SW_RST;`
285	876	rherveille
286			`/* display debug information */`
287	1488	nogj	`TRACE("ata_device_sw_reset initiated.\n");`
288	876	rherveille	`}`
289			`}`
290	1065	rherveille	`else if (device->internals.state == ATA_STATE_SW_RST)`
291	876	rherveille	`{ /* are we doing a software reset ?? */`
292			`/* SRST bit cleared, end of software reset */`
293
294			`/execute device diagnostics /`
295			`ata_execute_device_diagnostics_cmd(device);`
296
297			`/* clear busy bit */`
298			`device->regs.status &= ~ATA_SR_BSY;`
299
300			`/* set DRDY bit, when not a PACKET device */`
301			`if (!device->packet)`
302			`device->regs.status \|= ATA_SR_DRDY;`
303
304			`/* set new state */`
305	1065	rherveille	`device->internals.state = ATA_STATE_IDLE;`
306	876	rherveille
307			`/* display debug information */`
308	1488	nogj	`TRACE("ata_device_sw_reset done.\n");`
309	876	rherveille	`}`
310			`/*`
311			`<else> We are doing a hardware reset (or similar)`
312			`ignore command`
313			`*/`
314			`}`
315
316
317			`/*`
318			`D E V I C E S _ D O _ C O M M A N D _ R E G I S T E R`
319			`*/`
320			`void ata_device_do_command_register(ata_device *device)`
321			`{`
322			`/* check BSY & DRQ */`
323			`if ( (device->regs.status & ATA_SR_BSY) \|\| (device->regs.status & ATA_SR_DRQ) )`
324			`if (device->regs.command != DEVICE_RESET)`
325	1488	nogj	`WARN("ata_device_write, writing a command while BSY or DRQ asserted.");`
326	876	rherveille
327			`/* check if device selected */`
328	1065	rherveille	`if ( (device->regs.device_head & ATA_DHR_DEV) == device->internals.dev )`
329	876	rherveille	`ata_device_execute_cmd(device);`
330			`else`
331			`{`
332			`/* if not selected, only respond to EXECUTE DEVICE DIAGNOSTICS */`
333			`if (device->regs.command == EXECUTE_DEVICE_DIAGNOSTICS)`
334			`ata_device_execute_cmd(device);`
335			`}`
336			`}`
337
338
339			`/*`
340			`D E V I C E S _ R E A D`
341			`*/`
342			`/* Read from devices */`
343			`short ata_devices_read(ata_devices *devices, char adr)`
344			`{`
345			`ata_device *device;`
346
347			`/* check for no connected devices */`
348			`if ( (!devices->device0.stream) && (!devices->device1.stream) )`
349	1488	nogj	`ERR("ata_devices_read, no ata devices connected.\n");`
350	876	rherveille	`else`
351			`{`
352			`/* check if both device0 and device1 are connected */`
353			`if ( (devices->device0.stream) && (devices->device1.stream) )`
354			`{`
355			`/* get the current active device */`
356			`if (devices->device1.regs.device_head & ATA_DHR_DEV)`
357			`device = &devices->device1;`
358			`else`
359			`device = &devices->device0;`
360			`}`
361			`else`
362			`{`
363			`/* only one device connected */`
364			`if (devices->device1.stream)`
365			`device = &devices->device1;`
366			`else`
367			`device = &devices->device0;`
368			`}`
369
370			`/* return data provided by selected device */`
371			`switch (adr) {`
372			`case ATA_ASR :`
373	1488	nogj	`TRACE("alternate_status register read\n");`
374	1065	rherveille	`if ( (device->regs.device_head & ATA_DHR_DEV) == device->internals.dev )`
375	876	rherveille	`return device -> regs.status;`
376			`else`
377			`{`
378	1488	nogj	`TRACE("device0 responds for device1, asr = 0x00\n");`
379	876	rherveille	`return 0; // return 0 when device0 responds for device1`
380			`}`
381
382			`case ATA_CHR :`
383	1488	nogj	`TRACE("cylinder_high register read, value = 0x%02X\n",`
384			`device->regs.cylinder_high);`
385	876	rherveille	`return device -> regs.cylinder_high;`
386
387			`case ATA_CLR :`
388	1488	nogj	`TRACE("cylinder_low register read, value = 0x%02X\n",`
389	876	rherveille	`device->regs.cylinder_low);`
390			`return device -> regs.cylinder_low;`
391
392			`case ATA_DR :`
393	1065	rherveille	`if (!device->regs.status & ATA_SR_DRQ)`
394			`{`
395	1488	nogj	`TRACE("data register read, while DRQ bit negated\n" );`
396	1065	rherveille	`return 0;`
397			`}`
398			`else`
399			`{`
400	1488	nogj	`TRACE("data register read, value = 0x%04X, cnt = %3d\n",`
401			`*device->internals.dbuf_ptr, device->internals.dbuf_cnt);`
402	1065	rherveille	`if (!--device->internals.dbuf_cnt)`
403			`device->regs.status &= ~ATA_SR_DRQ;`
404			`return *device -> internals.dbuf_ptr++;`
405			`}`
406	876	rherveille
407			`case ATA_DHR :`
408	1488	nogj	`TRACE("device_head register read, value = 0x%02X\n",`
409	876	rherveille	`device->regs.device_head);`
410			`return device -> regs.device_head;`
411
412			`case ATA_ERR :`
413	1488	nogj	`TRACE("error register read, value = 0x%02X\n",`
414	876	rherveille	`device->regs.error);`
415			`return device -> regs.error;`
416
417			`case ATA_SCR :`
418	1488	nogj	`TRACE("sectorcount register read, value = 0x%02X\n",`
419	876	rherveille	`device->regs.sector_count);`
420			`return device -> regs.sector_count;`
421
422			`case ATA_SNR :`
423	1488	nogj	`TRACE("sectornumber register read, value = 0x%02X\n",`
424	876	rherveille	`device->regs.sector_number);`
425			`return device -> regs.sector_number;`
426
427			`case ATA_SR :`
428	1488	nogj	`TRACE("status register read\n");`
429	1065	rherveille	`if ( (device->regs.device_head & ATA_DHR_DEV) == device->internals.dev)`
430	876	rherveille	`return device -> regs.status;`
431			`else`
432			`{`
433	1488	nogj	`TRACE("device0 responds for device1, sr = 0x00\n");`
434	876	rherveille	`return 0; // return 0 when device0 responds for device1`
435			`}`
436
437			`// case ATA_DA :`
438			`// return device -> regs.status;`
439			`}`
440			`}`
441	1557	nogj	`return 0;`
442	876	rherveille	`}`
443
444
445			`/*`
446			`D E V I C E S _ W R I T E`
447			`*/`
448			`/* write to a single device */`
449	1693	nogj	`static void ata_device_write(ata_device *device, char adr, short value)`
450	876	rherveille	`{`
451			`switch (adr) {`
452			`case ATA_CR :`
453			`/display debug information /`
454	1488	nogj	`TRACE("command register written, value = 0x%02X\n", value);`
455	876	rherveille
456			`device->regs.command = value;`
457
458			`/* check command register settings and execute command */`
459			`ata_device_do_command_register(device);`
460			`break;`
461
462
463			`case ATA_CHR :`
464			`/display debug information /`
465	1488	nogj	`TRACE("cylinder high register written, value = 0x%02X\n", value);`
466	876	rherveille
467			`device->regs.cylinder_high = value;`
468			`break;`
469
470			`case ATA_CLR :`
471			`/display debug information /`
472	1488	nogj	`TRACE("cylinder low register written, value = 0x%02X\n", value);`
473	876	rherveille
474			`device->regs.cylinder_low = value;`
475			`break;`
476
477			`case ATA_DR :`
478			`/display debug information /`
479	1488	nogj	`TRACE("data register written, value = 0x%04X\n", value);`
480	876	rherveille
481			`device->regs.dataport_i = value;`
482			`break;`
483
484			`case ATA_DCR :`
485			`/display debug information /`
486	1488	nogj	`TRACE("device control register written, value = 0x%02X\n", value);`
487	876	rherveille
488			`device->regs.device_control = value;`
489			`ata_device_do_control_register(device);`
490			`break;`
491
492			`case ATA_DHR :`
493			`/display debug information /`
494	1488	nogj	`TRACE("device head register written, value = 0x%02X\n", value);`
495	876	rherveille
496			`device->regs.device_head = value;`
497			`break;`
498
499			`case ATA_FR :`
500			`/display debug information /`

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