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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 <byteswap.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->conf.type)
  {
    case TYPE_NO_CONNECT:
      TRACE("ata_device, using type NO_CONNECT.\n");
      device->conf.stream = NULL;
      break;
 
    case TYPE_FILE:
      TRACE("ata_device, using device type FILE.\n");
      device->conf.stream = open_file(&device->conf.size, device->conf.file);
      break;
 
    case TYPE_LOCAL:
      TRACE("ata_device, using device type LOCAL.\n");
      device->conf.stream = open_local();
      break;
 
    default:
      ERR("Illegal device-type.  Defaulting to type NO_CONNECT.\n");
      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(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(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(ata_devices *devices, int reset_signal)
{
  /* display debug information                                        */
  TRACE("ata_devices_hw_reset.\n");
 
  /* 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 */
  } 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->conf.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);
  }
}
 
 
/* Return contents of status register in pretty for */
static const char *ata_pretty_status(uint8_t status)
{
  static char str[50];
 
  str[0] = '\0';
  if(status & ATA_SR_BSY)
    strcat(str, "BUSY");
  if(status & ATA_SR_DRDY)
    strcat(str, "| READY");
  if(status & ATA_SR_DF)
    strcat(str, "| FAULT");
  if(status & ATA_SR_DSC)
    strcat(str, "| SEEKC");
  if(status & ATA_SR_DRQ)
    strcat(str, "| DRQ");
  if(status & ATA_SR_COR)
    strcat(str, "| COR");
  if(status & ATA_SR_IDX)
    strcat(str, "| IDX");
  if(status & ATA_SR_ERR)
    strcat(str, "| ERROR");
  return str;
}
 
/*
  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->device[0].conf.stream) && (!devices->device[1].conf.stream))
        ERR("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 :
          TRACE("read alternate status register: %s\n",
                ata_pretty_status(device->regs.status));
          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 {
              uint16_t val = le16_(*device->internals.dbuf_ptr++);
              TRACE("data register read, value = 0x%04X, cnt = %3d\n", val,
                    device->internals.dbuf_cnt);
              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 :
          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( "read status register: %s\n",
                 ata_pretty_status(device->regs.status) );
          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                               */
            if(!device->regs.status & ATA_SR_DRQ) {
               TRACE("data register write, while DRQ bit negated\n");
               break;
            } else {
                TRACE("data register write, value = 0x%04X, cnt = %3d\n",
                      value, device->internals.dbuf_cnt);
                *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 :
            /*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->device[0].conf.stream && !devices->device[1].conf.stream)
    ERR("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);
  }
}
 

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	1714	nogj	`#include <byteswap.h>`
26	1350	nogj
27			`#include "config.h"`
28
29			`#ifdef HAVE_INTTYPES_H`
30			`#include <inttypes.h>`
31			`#endif`
32
33			`#include "port.h"`
34			`#include "arch.h"`
35	876	rherveille	`#include "abstract.h"`
36
37			`#include "atadevice.h"`
38			`#include "atacmd.h"`
39			`#include "sim-config.h"`
40			`#include "atadevice_cmdi.h"`
41
42	1488	nogj	`#include "debug.h"`
43
44			`DEFAULT_DEBUG_CHANNEL(ata);`
45
46	876	rherveille	`/*`
47			`mandatory commands:`
48	919	rherveille	`- execute device diagnostics (done)`
49	876	rherveille	`- flush cache`
50	919	rherveille	`- identify device (done)`
51			`- initialize device parameters (done)`
52	876	rherveille	`- read dma`
53			`- read multiple`
54	919	rherveille	`- read sector(s) (done)`
55	876	rherveille	`- read verify sector(s)`
56			`- seek`
57			`- set features`
58			`- set multiple mode`
59			`- write dma`
60			`- write multiple`
61			`- write sector(s)`
62
63
64			`optional commands:`
65			`- download microcode`
66			`- nop`
67			`- read buffer`
68			`- write buffer`
69
70
71			`prohibited commands:`
72			`- device reset`
73			`*/`
74
75
76	1693	nogj	`/* Use a file to simulate a hard-disk */`
77			`static FILE open_file(uint32_t size, const char *filename)`
78	876	rherveille	`{`
79	1693	nogj	`FILE *fp;`
80			`unsigned long n;`
81	876	rherveille
82	1693	nogj	`// TODO:`
83
84			`/* check if a file with name 'filename' already exists */`
85			`if(!(fp = fopen(filename, "rb+")))`
86			`if(!(fp = fopen(filename, "wb+"))) {`
87			`ERR("ata_open_file, cannot open hd-file %s\n", filename);`
88			`return NULL;`
89			`} else {`
90			`/* TODO create a file 'size' large */`
91			`/* create a file 'size' large */`
92			`TRACE("ata_device; generating a new hard disk file.\n");`
93			`TRACE("This may take a while, depending on the requested size.\n");`
94			`for(n=0; n < *size; n++)`
95			`fputc(0, fp);`
96			`}`
97			`else /* file already exist */`
98			`fprintf(stderr, "file %s already exists. Using existing file.\n", filename);`
99
100			`TRACE("requested filesize was: %d (MBytes).\n", *size);`
101
102			`/* get the size of the file. This is also the size of the harddisk*/`
103			`fseek(fp, 0, SEEK_END);`
104			`*size = ftell(fp);`
105
106			`TRACE("actual filesize is: %d (MBytes).\n", *size >> 20);`
107
108			`return fp;`
109	876	rherveille	`}`
110
111
112	1693	nogj	`/* Use a the local filesystem as a hard-disk */`
113			`static FILE *open_local(void)`
114	876	rherveille	`{`
115	1693	nogj	`// TODO:`
116			`FIXME("Device type LOCAL is not yet supported. Defaulting to device type NO_CONNECT.");`
117			`return NULL;`
118			`}`
119
120			`static void ata_device_init(ata_device *device, int dev)`
121			`{`
122	876	rherveille	`/* set DeviceID */`
123	1065	rherveille	`device->internals.dev = dev;`
124	876	rherveille
125			`/* generate stream for hd_simulation */`
126	1695	nogj	`switch(device->conf.type)`
127	876	rherveille	`{`
128			`case TYPE_NO_CONNECT:`
129	1488	nogj	`TRACE("ata_device, using type NO_CONNECT.\n");`
130	1695	nogj	`device->conf.stream = NULL;`
131	876	rherveille	`break;`
132
133			`case TYPE_FILE:`
134	1488	nogj	`TRACE("ata_device, using device type FILE.\n");`
135	1695	nogj	`device->conf.stream = open_file(&device->conf.size, device->conf.file);`
136	876	rherveille	`break;`
137
138			`case TYPE_LOCAL:`
139	1488	nogj	`TRACE("ata_device, using device type LOCAL.\n");`
140	1695	nogj	`device->conf.stream = open_local();`
141	876	rherveille	`break;`
142
143			`default:`
144	1488	nogj	`ERR("Illegal device-type. Defaulting to type NO_CONNECT.\n");`
145	1695	nogj	`device->conf.stream = NULL;`
146	876	rherveille	`break;`
147			`}`
148	1708	nogj
149			`device->conf.size_sect = device->conf.size / BYTES_PER_SECTOR;`
150	876	rherveille	`}`
151
152	1693	nogj	`/*`
153			`D E V I C E S _ I N I T`
154			`*/`
155			`void ata_devices_init(ata_devices *devices)`
156	876	rherveille	`{`
157	1694	nogj	`ata_device_init(&devices->device[0], 0);`
158	876	rherveille
159	1695	nogj	`if(devices->device[0].conf.type)`
160	1694	nogj	`ata_device_init(&devices->device[1], ATA_DHR_DEV);`
161	1693	nogj	`else`
162	1694	nogj	`ata_device_init(&devices->device[1], 0);`
163	1693	nogj	`}`
164	876	rherveille
165	1693	nogj	`/*`
166			`D E V I C E S _ H W _ R E S E T`
167			`*/`
168			`static void ata_device_hw_reset(ata_device *device, int reset_signal,`
169			`int daspo, int pdiagi, int daspi)`
170			`{`
171			`/* check ata-device state */`
172			`if(device->internals.state == ATA_STATE_HW_RST) {`
173			`if(!reset_signal) {`
174			`/* hardware reset finished */`
175	876	rherveille
176	1693	nogj	`/* set sectors_per_track & heads_per_cylinders */`
177	1712	nogj	`device->internals.sectors_per_track = device->conf.sectors;`
178			`device->internals.heads_per_cylinder = device->conf.heads;`
179	876	rherveille
180	1693	nogj	`/* set device1 input signals */`
181			`device->sigs.pdiagi = pdiagi;`
182			`device->sigs.daspi = daspi;`
183	876	rherveille
184	1693	nogj	`ata_execute_device_diagnostics_cmd(device);`
185	876	rherveille
186	1693	nogj	`/* clear busy bit */`
187			`device->regs.status &= ~ATA_SR_BSY;`
188	876	rherveille
189	1693	nogj	`/* set DRDY bit, when not a PACKET device */`
190	1695	nogj	`if(!device->conf.packet)`
191	1693	nogj	`device->regs.status \|= ATA_SR_DRDY;`
192	876	rherveille
193	1693	nogj	`/* set new state */`
194			`device->internals.state = ATA_STATE_IDLE;`
195			`}`
196			`} else if (reset_signal) {`
197			`/* hardware reset signal asserted, stop what we are doing */`
198	876	rherveille
199	1693	nogj	`/* negate bus signals */`
200			`device->sigs.iordy = 0;`
201			`device->sigs.intrq = 0;`
202			`device->sigs.dmarq = 0;`
203			`device->sigs.pdiago = 0;`
204			`device->sigs.daspo = daspo;`
205	876	rherveille
206	1693	nogj	`/* set busy bit */`
207			`device->regs.status \|= ATA_SR_BSY;`
208	876	rherveille
209	1693	nogj	`/* set new state */`
210			`device->internals.state = ATA_STATE_HW_RST;`
211			`}`
212			`}`
213	876	rherveille
214			`/* power-on and hardware reset */`
215			`void ata_devices_hw_reset(ata_devices *devices, int reset_signal)`
216			`{`
217			`/* display debug information */`
218	1488	nogj	`TRACE("ata_devices_hw_reset.\n");`
219	876	rherveille
220			`/* find device 0 */`
221	1695	nogj	`if((devices->device[0].conf.stream) && (devices->device[1].conf.stream)) {`
222	876	rherveille	`/* this one is simple, device0 is device0 */`
223
224			`/* 1) handle device1 first */`
225	1694	nogj	`ata_device_hw_reset(&devices->device[1], reset_signal,`
226	1065	rherveille	`1, /* assert dasp, this is device1 */`
227			`0, /* negate pdiag input, no more devices */`
228	876	rherveille	`0); /* negate dasp input, no more devices */`
229
230			`/* 2) Then handle device0 */`
231	1694	nogj	`ata_device_hw_reset(&devices->device[0], reset_signal,`
232	1065	rherveille	`0,`
233	1694	nogj	`devices->device[1].sigs.pdiago,`
234			`devices->device[1].sigs.daspo);`
235	1695	nogj	`} else if(devices->device[0].conf.stream) {`
236	876	rherveille	`/* device0 is device0, there's no device1 */`
237	1694	nogj	`ata_device_hw_reset(&devices->device[0], reset_signal,`
238	1065	rherveille	`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	1695	nogj	`} else if(devices->device[1].conf.stream) {`
242	876	rherveille	`/* device1 is (logical) device0, there's no (physical) device0 */`
243	1694	nogj	`ata_device_hw_reset(&devices->device[1], reset_signal,`
244	1065	rherveille	`0, /* negate dasp, this is device0 */`
245			`0, /* negate pdiag input, there's no device1*/`
246	876	rherveille	`0); /* negate dasp input, there's no device1 */`
247	1694	nogj	`} else {`
248	876	rherveille	`/* no devices connected */`
249	1488	nogj	`TRACE("ata_device_hw_reset, no devices connected.\n");`
250	876	rherveille	`}`
251			`}`
252
253	1065	rherveille
254	876	rherveille	`/*`
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			`void ata_device_do_control_register(ata_device *device)`
261			`{`
262			`/* TODO respond to new values of nIEN */`
263			`/* if device not selected, respond to new values of nIEN & SRST */`
264
265			`/* check if SRST bit is set */`
266			`if (device->regs.device_control & ATA_DCR_RST)`
267			`{`
268	1065	rherveille	`if (device->internals.state == ATA_STATE_IDLE)`
269	876	rherveille	`{ /* start software reset */`
270			`/* negate bus signals */`
271			`device->sigs.pdiago = 0;`
272			`device->sigs.intrq = 0;`
273			`device->sigs.iordy = 0;`
274			`device->sigs.dmarq = 0;`
275
276			`/* set busy bit */`
277			`device->regs.status \|= ATA_SR_BSY;`
278
279			`/* set new state */`
280	1065	rherveille	`device->internals.state = ATA_STATE_SW_RST;`
281	876	rherveille
282			`/* display debug information */`
283	1488	nogj	`TRACE("ata_device_sw_reset initiated.\n");`
284	876	rherveille	`}`
285			`}`
286	1065	rherveille	`else if (device->internals.state == ATA_STATE_SW_RST)`
287	876	rherveille	`{ /* are we doing a software reset ?? */`
288			`/* SRST bit cleared, end of software reset */`
289
290			`/execute device diagnostics /`
291			`ata_execute_device_diagnostics_cmd(device);`
292
293			`/* clear busy bit */`
294			`device->regs.status &= ~ATA_SR_BSY;`
295
296			`/* set DRDY bit, when not a PACKET device */`
297	1695	nogj	`if(!device->conf.packet)`
298	876	rherveille	`device->regs.status \|= ATA_SR_DRDY;`
299
300			`/* set new state */`
301	1065	rherveille	`device->internals.state = ATA_STATE_IDLE;`
302	876	rherveille
303			`/* display debug information */`
304	1488	nogj	`TRACE("ata_device_sw_reset done.\n");`
305	876	rherveille	`}`
306			`/*`
307			`<else> We are doing a hardware reset (or similar)`
308			`ignore command`
309			`*/`
310			`}`
311
312
313			`/*`
314			`D E V I C E S _ D O _ C O M M A N D _ R E G I S T E R`
315			`*/`
316			`void ata_device_do_command_register(ata_device *device)`
317			`{`
318			`/* check BSY & DRQ */`
319			`if ( (device->regs.status & ATA_SR_BSY) \|\| (device->regs.status & ATA_SR_DRQ) )`
320			`if (device->regs.command != DEVICE_RESET)`
321	1488	nogj	`WARN("ata_device_write, writing a command while BSY or DRQ asserted.");`
322	876	rherveille
323			`/* check if device selected */`
324	1065	rherveille	`if ( (device->regs.device_head & ATA_DHR_DEV) == device->internals.dev )`
325	876	rherveille	`ata_device_execute_cmd(device);`
326			`else`
327			`{`
328			`/* if not selected, only respond to EXECUTE DEVICE DIAGNOSTICS */`
329			`if (device->regs.command == EXECUTE_DEVICE_DIAGNOSTICS)`
330			`ata_device_execute_cmd(device);`
331			`}`
332			`}`
333
334
335	1696	nogj	`/* Return contents of status register in pretty for */`
336			`static const char *ata_pretty_status(uint8_t status)`
337			`{`
338			`static char str[50];`
339
340			`str[0] = '\0';`
341			`if(status & ATA_SR_BSY)`
342			`strcat(str, "BUSY");`
343			`if(status & ATA_SR_DRDY)`
344			`strcat(str, "\| READY");`
345			`if(status & ATA_SR_DF)`
346			`strcat(str, "\| FAULT");`
347			`if(status & ATA_SR_DSC)`
348			`strcat(str, "\| SEEKC");`
349			`if(status & ATA_SR_DRQ)`
350			`strcat(str, "\| DRQ");`
351			`if(status & ATA_SR_COR)`
352			`strcat(str, "\| COR");`
353			`if(status & ATA_SR_IDX)`
354			`strcat(str, "\| IDX");`
355			`if(status & ATA_SR_ERR)`
356			`strcat(str, "\| ERROR");`
357			`return str;`
358			`}`
359
360	876	rherveille	`/*`
361			`D E V I C E S _ R E A D`
362			`*/`
363			`/* Read from devices */`
364			`short ata_devices_read(ata_devices *devices, char adr)`
365			`{`
366			`ata_device *device;`
367
368			`/* check for no connected devices */`
369	1695	nogj	`if((!devices->device[0].conf.stream) && (!devices->device[1].conf.stream))`
370	1488	nogj	`ERR("ata_devices_read, no ata devices connected.\n");`
371	876	rherveille	`else`
372			`{`
373			`/* check if both device0 and device1 are connected */`
374	1695	nogj	`if((devices->device[0].conf.stream) && (devices->device[1].conf.stream)) {`
375	876	rherveille	`/* get the current active device */`
376	1694	nogj	`if (devices->device[1].regs.device_head & ATA_DHR_DEV)`
377			`device = &devices->device[1];`
378	876	rherveille	`else`
379	1694	nogj	`device = &devices->device[0];`
380	876	rherveille	`}`
381			`else`
382			`{`
383			`/* only one device connected */`
384	1695	nogj	`if(devices->device[1].conf.stream)`
385	1694	nogj	`device = &devices->device[1];`
386	876	rherveille	`else`
387	1694	nogj	`device = &devices->device[0];`
388	876	rherveille	`}`
389
390			`/* return data provided by selected device */`
391			`switch (adr) {`
392			`case ATA_ASR :`
393	1696	nogj	`TRACE("read alternate status register: %s\n",`
394			`ata_pretty_status(device->regs.status));`
395	1065	rherveille	`if ( (device->regs.device_head & ATA_DHR_DEV) == device->internals.dev )`
396	876	rherveille	`return device -> regs.status;`
397			`else`
398			`{`
399	1488	nogj	`TRACE("device0 responds for device1, asr = 0x00\n");`
400	876	rherveille	`return 0; // return 0 when device0 responds for device1`
401			`}`
402
403			`case ATA_CHR :`
404	1488	nogj	`TRACE("cylinder_high register read, value = 0x%02X\n",`
405			`device->regs.cylinder_high);`
406	876	rherveille	`return device -> regs.cylinder_high;`
407
408			`case ATA_CLR :`
409	1488	nogj	`TRACE("cylinder_low register read, value = 0x%02X\n",`
410	876	rherveille	`device->regs.cylinder_low);`
411			`return device -> regs.cylinder_low;`
412
413			`case ATA_DR :`
414	1705	nogj	`if(!device->regs.status & ATA_SR_DRQ) {`
415	1488	nogj	`TRACE("data register read, while DRQ bit negated\n" );`
416	1065	rherveille	`return 0;`
417	1705	nogj	`} else {`
418	1714	nogj	`uint16_t val = le16_(*device->internals.dbuf_ptr++);`
419	1705	nogj	`TRACE("data register read, value = 0x%04X, cnt = %3d\n", val,`
420			`device->internals.dbuf_cnt);`
421			`if(!--device->internals.dbuf_cnt) {`
422	1065	rherveille	`device->regs.status &= ~ATA_SR_DRQ;`
423	1705	nogj	`if(device->internals.end_t_func)`
424			`device->internals.end_t_func(device);`
425			`}`
426			`return val;`
427	1065	rherveille	`}`
428	876	rherveille
429			`case ATA_DHR :`
430	1488	nogj	`TRACE("device_head register read, value = 0x%02X\n",`
431	876	rherveille	`device->regs.device_head);`
432			`return device -> regs.device_head;`
433
434			`case ATA_ERR :`
435	1488	nogj	`TRACE("error register read, value = 0x%02X\n",`
436	876	rherveille	`device->regs.error);`
437			`return device -> regs.error;`
438
439			`case ATA_SCR :`
440	1488	nogj	`TRACE("sectorcount register read, value = 0x%02X\n",`
441	876	rherveille	`device->regs.sector_count);`
442			`return device -> regs.sector_count;`
443
444			`case ATA_SNR :`
445	1488	nogj	`TRACE("sectornumber register read, value = 0x%02X\n",`
446	876	rherveille	`device->regs.sector_number);`
447			`return device -> regs.sector_number;`
448
449	1696	nogj	`case ATA_SR:`
450			`TRACE( "read status register: %s\n",`
451			`ata_pretty_status(device->regs.status) );`
452	1065	rherveille	`if ( (device->regs.device_head & ATA_DHR_DEV) == device->internals.dev)`
453	876	rherveille	`return device -> regs.status;`
454			`else`
455			`{`
456	1488	nogj	`TRACE("device0 responds for device1, sr = 0x00\n");`
457	876	rherveille	`return 0; // return 0 when device0 responds for device1`
458			`}`
459
460			`// case ATA_DA :`
461			`// return device -> regs.status;`
462			`}`
463			`}`
464	1557	nogj	`return 0;`
465	876	rherveille	`}`
466
467
468			`/*`
469			`D E V I C E S _ W R I T E`
470			`*/`
471			`/* write to a single device */`
472	1693	nogj	`static void ata_device_write(ata_device *device, char adr, short value)`
473	876	rherveille	`{`
474			`switch (adr) {`
475			`case ATA_CR :`
476			`/display debug information /`
477	1488	nogj	`TRACE("command register written, value = 0x%02X\n", value);`
478	876	rherveille
479			`device->regs.command = value;`
480
481			`/* check command register settings and execute command */`
482			`ata_device_do_command_register(device);`
483			`break;`
484
485
486			`case ATA_CHR :`
487			`/display debug information /`
488	1488	nogj	`TRACE("cylinder high register written, value = 0x%02X\n", value);`
489	876	rherveille
490			`device->regs.cylinder_high = value;`
491			`break;`
492
493			`case ATA_CLR :`
494			`/display debug information /`
495	1488	nogj	`TRACE("cylinder low register written, value = 0x%02X\n", value);`
496	876	rherveille
497			`device->regs.cylinder_low = value;`
498			`break;`
499
500			`case ATA_DR :`

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