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/*  This file is part of the program psim.

    Copyright (C) 1996, Andrew Cagney <cagney@highland.com.au>

    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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

    */

#ifndef _HW_IDE_C_

#define _HW_IDE_C_

#include "device_table.h"

/* DEVICE

   ide - Integrated Disk Electronics

   DESCRIPTION

   This device models the primary/secondary <<ide>> controller

   described in the [CHRPIO] document.

   The controller has separate independant interrupt outputs for each

   <<ide>> bus.

   PROPERTIES

   reg = ...  (required)

   The <<reg>> property is described in the document [CHRPIO].

   ready-delay = <integer>  (optional)

   If present, this specifies the time that the <<ide>> device takes

   to complete an I/O operation.

   disk@?/ide-byte-count = <integer>  (optional)

   disk@?/ide-sector-count = <integer>  (optional)

   disk@?/ide-head-count = <integer>  (optional)

   The <<ide>> device checks each child (disk device) node to see if

   it has the above properties.  If present, these values will be used

   to compute the <<LBA>> address in <<CHS>> addressing mode.

   EXAMPLES

   Enable tracing:

   |  -t ide-device \

   Attach the <<ide>> device to the <<pci>> bus at slot one.  Specify

   legacy I/O addresses:

   |  -o '/phb/ide@1/assigned-addresses \

   |        ni0,0,10,1f0 8 \

   |        ni0,0,14,3f8 8 \

   |        ni0,0,18,170 8 \

   |        ni0,0,1c,378 8 \

   |        ni0,0,20,200 8' \

   |  -o '/phb@0x80000000/ide@1/reg \

   |        1 0 \

   |        i0,0,10,0 8 \

   |        i0,0,18,0 8 \

   |        i0,0,14,6 1 \

   |        i0,0,1c,6 1 \

   |        i0,0,20,0 8' \

   Note: the fouth and fifth reg entries specify that the register is

   at an offset into the address specified by the base register

   (<<assigned-addresses>>); Apart from restrictions placed by the

   <<pci>> specification, no restrictions are placed on the number of

   base registers specified by the <<assigned-addresses>> property.

   Attach a <<disk>> to the primary and a <<cdrom>> to the secondary

   <<ide>> controller.

   |  -o '/phb@0x80000000/ide@1/disk@0/file "zero' \

   |  -o '/phb@0x80000000/ide@1/cdrom@2/file "/dev/cdrom"' \

   Connect the two interrupt outputs (a and b) to a <<glue>> device to

   allow testing of the interrupt port. In a real simulation they

   would be wired to the interrupt controller.

   |  -o '/phb@0x80000000/glue@2/reg 2 0 ni0,0,0,0 8' \

   |  -o '/phb@0x80000000/ide@1 > a 0 /phb@0x80000000/glue@2' \

   |  -o '/phb@0x80000000/ide@1 > b 1 /phb@0x80000000/glue@2'

   BUGS

   While the DMA registers are present, DMA support has not yet been

   implemented.

   The number of supported commands is very limited.

   The standards documents appear to be vague on how to specify the

   <<unit-address>> of disk devices devices being attached to the

   <<ide>> controller.  I've chosen to use integers with devices zero

   and one going to the primary controller while two and three are

   connected to the secondary controller.

   REFERENCES

   [CHRPIO] PowerPC(tm) Microprocessor Common Hardware Reference

   Platform: I/O Device Reference.  http://chrp.apple.com/???.

   [SCHMIDT] The SCSI Bus and IDE Interface - Protocols, Applications

   and Programming.  Friedhelm Schmidt (translated by Michael

   Schultz).  ISBN 0-201-42284-0.  Addison-Wesley Publishing Company.

   */

typedef enum _io_direction {

  is_read,

  is_write,

} io_direction;

enum {

  nr_ide_controllers = 2,

  nr_ide_drives_per_controller = 2,

  nr_fifo_entries = 8192,

};

enum {

  /* command register block - read */

  ide_data_reg,

  ide_error_reg, /*ide_feature_reg*/

  ide_sector_count_reg,

  ide_sector_number_reg,

  ide_cylinder_reg0,

  ide_cylinder_reg1,

  ide_drive_head_reg,

  ide_status_reg, /*ide_command_reg*/

  /* command register block - write */

  ide_feature_reg, /*ide_error_reg*/

  ide_command_reg, /*ide_status_reg*/

  /* control register block - read */

  ide_alternate_status_reg, /*ide_control_reg*/

  ide_control_reg, /*ide_alternate_status_reg*/

  /* dma register block */

  ide_dma_command_reg,

  ide_dma_unused_1_reg,

  ide_dma_status_reg,

  ide_dma_unused_3_reg,

  ide_dma_prd_table_address_reg0,

  ide_dma_prd_table_address_reg1,

  ide_dma_prd_table_address_reg2,

  ide_dma_prd_table_address_reg3,

  nr_ide_registers,

};

typedef enum _ide_states {

  idle_state,

  busy_loaded_state,

  busy_drained_state,

  busy_dma_state,

  busy_command_state,

  loading_state,

  draining_state,

} ide_states;

static const char *

ide_state_name(ide_states state)

{

  switch (state) {

  case idle_state: return "idle";

  case busy_loaded_state: return "busy_loaded_state";

  case busy_drained_state: return "busy_drained_state";

  case busy_dma_state: return "busy_dma_state";

  case busy_command_state: return "busy_command_state";

  case loading_state: return "loading_state";

  case draining_state: return "draining_state";

  default: return "illegal-state";

  }

}

typedef struct _ide_geometry {

  int head;

  int sector;

  int byte;

} ide_geometry;

typedef struct _ide_drive {

  int nr;

  device *device;

  ide_geometry geometry;

  ide_geometry default_geometry;

} ide_drive;

typedef struct _ide_controller {

  int nr;

  ide_states state;

  unsigned8 reg[nr_ide_registers];

  unsigned8 fifo[nr_fifo_entries];

  int fifo_pos;

  int fifo_size;

  ide_drive *current_drive;

  int current_byte;

  int current_transfer;

  ide_drive drive[nr_ide_drives_per_controller];

  device *me;

  event_entry_tag event_tag;

  int is_interrupting;

  signed64 ready_delay;

} ide_controller;

static void

set_interrupt(device *me,

              ide_controller *controller)

{

  if ((controller->reg[ide_control_reg] & 0x2) == 0) {

    DTRACE(ide, ("controller %d - interrupt set\n", controller->nr));

    device_interrupt_event(me, controller->nr, 1, NULL, 0);

    controller->is_interrupting = 1;

  }

}

static void

clear_interrupt(device *me,

                ide_controller *controller)

{

  if (controller->is_interrupting) {

    DTRACE(ide, ("controller %d - interrupt clear\n", controller->nr));

    device_interrupt_event(me, controller->nr, 0, NULL, 0);

    controller->is_interrupting = 0;

  }

}

static void

do_event(void *data)

{

  ide_controller *controller = data;

  device *me = controller->me;

  controller->event_tag = 0;

  switch (controller->state) {

  case busy_loaded_state:

  case busy_drained_state:

    if (controller->current_transfer > 0) {

      controller->state = (controller->state == busy_loaded_state

                           ? loading_state : draining_state);

    }

    else {

      controller->state = idle_state;

    }

    set_interrupt(me, controller);

    break;

  default:

    device_error(me, "controller %d - unexpected event", controller->nr);

    break;

  }

}

static void

schedule_ready_event(device *me,

                     ide_controller *controller)

{

  if (controller->event_tag != 0)

    device_error(me, "controller %d - attempting to schedule multiple events",

                 controller->nr);

  controller->event_tag =

    device_event_queue_schedule(me, controller->ready_delay,

                                do_event, controller);

}

static void

do_fifo_read(device *me,

             ide_controller *controller,

             void *dest,

             int nr_bytes)

{

  if (controller->state != draining_state)

    device_error(me, "controller %d - reading fifo when not ready (%s)",

                 controller->nr,

                 ide_state_name(controller->state));

  if (controller->fifo_pos + nr_bytes > controller->fifo_size)

    device_error(me, "controller %d - fifo underflow", controller->nr);

  if (nr_bytes > 0) {

    memcpy(dest, &controller->fifo[controller->fifo_pos], nr_bytes);

    controller->fifo_pos += nr_bytes;

  }

  if (controller->fifo_pos == controller->fifo_size) {

    controller->current_transfer -= 1;

    if (controller->current_transfer > 0

        && controller->current_drive != NULL) {

      DTRACE(ide, ("controller %d:%d - reading %d byte block at 0x%x\n",

                   controller->nr,

                   controller->current_drive->nr,

                   controller->fifo_size,

                   controller->current_byte));

      if (device_io_read_buffer(controller->current_drive->device,

                                controller->fifo,

                                0, controller->current_byte,

                                controller->fifo_size,

                                NULL, 0)

          != controller->fifo_size)

        device_error(me, "controller %d - disk %s io read error",

                     controller->nr,

                     device_path(controller->current_drive->device));

    }

    controller->state = busy_drained_state;

    controller->fifo_pos = 0;

    controller->current_byte += controller->fifo_size;

    schedule_ready_event(me, controller);

  }

}

static void

do_fifo_write(device *me,

              ide_controller *controller,

              const void *source,

              int nr_bytes)

{

  if (controller->state != loading_state)

    device_error(me, "controller %d - writing fifo when not ready (%s)",

                 controller->nr,

                 ide_state_name(controller->state));

  if (controller->fifo_pos + nr_bytes > controller->fifo_size)

    device_error(me, "controller %d - fifo overflow", controller->nr);

  if (nr_bytes > 0) {

    memcpy(&controller->fifo[controller->fifo_pos], source, nr_bytes);

    controller->fifo_pos += nr_bytes;

  }

  if (controller->fifo_pos == controller->fifo_size) {

    if (controller->current_transfer > 0

        && controller->current_drive != NULL) {

      DTRACE(ide, ("controller %d:%d - writing %d byte block at 0x%x\n",

                   controller->nr,

                   controller->current_drive->nr,

                   controller->fifo_size,

                   controller->current_byte));

      if (device_io_write_buffer(controller->current_drive->device,

                                 controller->fifo,

                                 0, controller->current_byte,

                                 controller->fifo_size,

                                 NULL, 0)

          != controller->fifo_size)

        device_error(me, "controller %d - disk %s io write error",

                     controller->nr,

                     device_path(controller->current_drive->device));

    }

    controller->current_transfer -= 1;

    controller->fifo_pos = 0;

    controller->current_byte += controller->fifo_size;

    controller->state = busy_loaded_state;

    schedule_ready_event(me, controller);

  }

}

static void

setup_fifo(device *me,

           ide_controller *controller,

           int is_simple,

           int is_with_disk,

           io_direction direction)

{

  /* find the disk */

  if (is_with_disk) {

    int drive_nr = (controller->reg[ide_drive_head_reg] & 0x10) != 0;

    controller->current_drive = &controller->drive[drive_nr];

  }

  else {

    controller->current_drive = NULL;

  }

  /* number of transfers */

  if (is_simple)

    controller->current_transfer = 1;

  else {

    int sector_count = controller->reg[ide_sector_count_reg];

    if (sector_count == 0)

      controller->current_transfer = 256;

    else

      controller->current_transfer = sector_count;

  }

  /* the transfer size */

  if (controller->current_drive == NULL)

    controller->fifo_size = 512;

  else

    controller->fifo_size = controller->current_drive->geometry.byte;

  /* empty the fifo */

  controller->fifo_pos = 0;

  /* the starting address */

  if (controller->current_drive == NULL)

    controller->current_byte = 0;

  else if (controller->reg[ide_drive_head_reg] & 0x40) {

    /* LBA addressing mode */

    controller->current_byte = controller->fifo_size

      * (((controller->reg[ide_drive_head_reg] & 0xf) << 24)

         | (controller->reg[ide_cylinder_reg1] << 16)

         | (controller->reg[ide_cylinder_reg0] << 8)

         | (controller->reg[ide_sector_number_reg]));

  }

  else if (controller->current_drive->geometry.head != 0

           && controller->current_drive->geometry.sector != 0) {

    /* CHS addressing mode */

    int head_nr = controller->reg[ide_drive_head_reg] & 0xf;

    int cylinder_nr = ((controller->reg[ide_cylinder_reg1] << 8)

                    | controller->reg[ide_cylinder_reg0]);

    int sector_nr = controller->reg[ide_sector_number_reg];

    controller->current_byte = controller->fifo_size

      * ((cylinder_nr * controller->current_drive->geometry.head + head_nr)

         * controller->current_drive->geometry.sector + sector_nr - 1);

  }

  else

    device_error(me, "controller %d:%d - CHS addressing disabled",

                 controller->nr, controller->current_drive->nr);

  DTRACE(ide, ("controller %ld:%ld - transfer (%s) %ld blocks of %ld bytes from 0x%lx\n",

               (long)controller->nr,

               controller->current_drive == NULL ? -1L : (long)controller->current_drive->nr,

               direction == is_read ? "read" : "write",

               (long)controller->current_transfer,

               (long)controller->fifo_size,

               (unsigned long)controller->current_byte));

  switch (direction) {

  case is_read:

    /* force a primeing read */

    controller->current_transfer += 1;

    controller->state = draining_state;

    controller->fifo_pos = controller->fifo_size;

    do_fifo_read(me, controller, NULL, 0);

    break;

  case is_write:

    controller->state = loading_state;

    break;

  }

}

static void

do_command(device *me,

           ide_controller *controller,

           int command)

{

  if (controller->state != idle_state)

    device_error(me, "controller %d - command when not idle", controller->nr);

  switch (command) {

  case 0x20: case 0x21: /* read-sectors */

    setup_fifo(me, controller, 0/*is_simple*/, 1/*is_with_disk*/, is_read);

    break;

  case 0x30: case 0x31: /* write */

    setup_fifo(me, controller, 0/*is_simple*/, 1/*is_with_disk*/, is_write);

    break;

  }

}

static unsigned8

get_status(device *me,

           ide_controller *controller)

{

  switch (controller->state) {

  case loading_state:

  case draining_state:

    return 0x08; /* data req */

  case busy_loaded_state:

  case busy_drained_state:

    return 0x80; /* busy */

  case idle_state:

    return 0x40; /* drive ready */

  default:

    device_error(me, "internal error");

    return 0;

  }

}

/* The address presented to the IDE controler is decoded and then

   mapped onto a controller:reg pair */

enum {

  nr_address_blocks = 6,

};

typedef struct _address_block {

  int space;

  unsigned_word base_addr;

  unsigned_word bound_addr;

  int controller;

  int base_reg;

} address_block;

typedef struct _address_decoder {

  address_block block[nr_address_blocks];

} address_decoder;

static void

decode_address(device *me,

               address_decoder *decoder,

               int space,

               unsigned_word address,

               int *controller,

               int *reg,

               io_direction direction)

{

  int i;

  for (i = 0; i < nr_address_blocks; i++) {

    if (space == decoder->block[i].space

        && address >= decoder->block[i].base_addr

        && address <= decoder->block[i].bound_addr) {

      *controller = decoder->block[i].controller;

      *reg = (address

              - decoder->block[i].base_addr

              + decoder->block[i].base_reg);

      if (direction == is_write) {

        switch (*reg) {

        case ide_error_reg: *reg = ide_feature_reg; break;

        case ide_status_reg: *reg = ide_command_reg; break;

        case ide_alternate_status_reg: *reg = ide_control_reg; break;

        default: break;

        }

      }

      return;

    }

  }

  device_error(me, "address %d:0x%lx invalid",

               space, (unsigned long)address);

}

static void

build_address_decoder(device *me,

                      address_decoder *decoder)

{

  int reg;

  for (reg = 1; reg < 6; reg++) {

    reg_property_spec unit;

    int space;

    unsigned_word address;

    unsigned size;

    /* find and decode the reg property */

    if (!device_find_reg_array_property(me, "reg", reg, &unit))

      device_error(me, "missing or invalid reg entry %d", reg);

    device_address_to_attach_address(device_parent(me), &unit.address,

                                     &space, &address, me);

    device_size_to_attach_size(device_parent(me), &unit.size, &size, me);

    /* insert it into the address decoder */

    switch (reg) {

    case 1:

    case 2:

      /* command register block */

      if (size != 8)

        device_error(me, "reg entry %d must have a size of 8", reg);

      decoder->block[reg-1].space = space;

      decoder->block[reg-1].base_addr = address;

      decoder->block[reg-1].bound_addr = address + size - 1;

      decoder->block[reg-1].controller = (reg + 1) % nr_ide_controllers;

      decoder->block[reg-1].base_reg = ide_data_reg;

      DTRACE(ide, ("controller %d command register block at %d:0x%lx..0x%lx\n",

                   decoder->block[reg-1].controller,

                   decoder->block[reg-1].space,

                   (unsigned long)decoder->block[reg-1].base_addr,

                   (unsigned long)decoder->block[reg-1].bound_addr));

      break;

    case 3:

    case 4:

      /* control register block */

      if (size != 1)

        device_error(me, "reg entry %d must have a size of 1", reg);

      decoder->block[reg-1].space = space;

      decoder->block[reg-1].base_addr = address;

      decoder->block[reg-1].bound_addr = address + size - 1;

      decoder->block[reg-1].controller = (reg + 1) % nr_ide_controllers;

      decoder->block[reg-1].base_reg = ide_alternate_status_reg;

      DTRACE(ide, ("controller %d control register block at %d:0x%lx..0x%lx\n",

                   decoder->block[reg-1].controller,

                   decoder->block[reg-1].space,

                   (unsigned long)decoder->block[reg-1].base_addr,

                   (unsigned long)decoder->block[reg-1].bound_addr));

      break;

    case 5:

      /* dma register block */

      if (size != 8)

        device_error(me, "reg entry %d must have a size of 8", reg);

      decoder->block[reg-1].space = space;

      decoder->block[reg-1].base_addr = address;

      decoder->block[reg-1].bound_addr = address + 4 - 1;

      decoder->block[reg-1].base_reg = ide_dma_command_reg;

      decoder->block[reg-1].controller = 0;

      DTRACE(ide, ("controller %d dma register block at %d:0x%lx..0x%lx\n",

                   decoder->block[reg-1].controller,

                   decoder->block[reg-1].space,

                   (unsigned long)decoder->block[reg-1].base_addr,

                   (unsigned long)decoder->block[reg-1].bound_addr));

      decoder->block[reg].space = space;

      decoder->block[reg].base_addr = address + 4;

      decoder->block[reg].bound_addr = address + 8 - 1;

      decoder->block[reg].controller = 1;

      decoder->block[reg].base_reg = ide_dma_command_reg;

      DTRACE(ide, ("controller %d dma register block at %d:0x%lx..0x%lx\n",

                   decoder->block[reg].controller,

                   decoder->block[reg-1].space,

                   (unsigned long)decoder->block[reg].base_addr,

                   (unsigned long)decoder->block[reg].bound_addr));

      break;

    default:

      device_error(me, "internal error - bad switch");

      break;

    }

  }

}

typedef struct _hw_ide_device {

  ide_controller controller[nr_ide_controllers];

  address_decoder decoder;

} hw_ide_device;

static void

hw_ide_init_address(device *me)

{

  hw_ide_device *ide = device_data(me);

  int controller;

  int drive;

  /* zero some things */

  for (controller = 0; controller < nr_ide_controllers; controller++) {

    memset(&ide->controller[controller], 0, sizeof(ide_controller));

    for (drive = 0; drive < nr_ide_drives_per_controller; drive++) {

      ide->controller[controller].drive[drive].nr = drive;

    }

    ide->controller[controller].me = me;

    if (device_find_property(me, "ready-delay") != NULL)

      ide->controller[controller].ready_delay =

        device_find_integer_property(me, "ready-delay");

  }

  /* attach this device to its parent */