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jeremybenn |
/* atadevice.h -- ATA Device code simulation
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Copyright (C) 2002 Richard Herveille, rherveille@opencores.org
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Copyright (C) 2008 Embecosm Limited
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Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>
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This file is part of Or1ksim, the OpenRISC 1000 Architectural Simulator.
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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You should have received a copy of the GNU General Public License along
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with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* This program is commented throughout in a fashion suitable for processing
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with Doxygen. */
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/*
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* Definitions for the Opencores ATA Controller Core, Device model
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*/
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#ifndef ATADEVICE__H
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#define ATADEVICE__H
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/* Autoconf and/or portability configuration */
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#include "port.h"
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/* System includes */
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#include <stdio.h>
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/* --- Register definitions --- */
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/* ----- ATA Registers */
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/* These are actually the memory locations where the ATA registers */
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/* can be found in the host system; i.e. as seen from the CPU. */
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/* However, this doesn't matter for the simulator. */
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#define ATA_ASR 0x78 /* Alternate Status Register (R) */
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#define ATA_CR 0x5c /* Command Register (W) */
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#define ATA_CHR 0x54 /* Cylinder High Register (R/W) */
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#define ATA_CLR 0x50 /* Cylinder Low Register (R/W) */
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#define ATA_DR 0x40 /* Data Register */
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#define ATA_DCR 0x78 /* Device Control Register (W) */
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#define ATA_DHR 0x58 /* Device/Head Register (R/W) */
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#define ATA_ERR 0x44 /* Error Register (R) */
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#define ATA_FR 0x44 /* Features Register (W) */
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#define ATA_SCR 0x48 /* Sector Count Register (R/W) */
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#define ATA_SNR 0x4c /* Sector Number Register (R/W) */
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#define ATA_SR 0x5c /* Status Register (R) */
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#define ATA_DA 0x7c /* Device Address Register (R) */
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/* ATA/ATAPI-5 does not describe Device Status Register */
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/* -------------------------------------- */
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/* ----- ATA Device bit defenitions ----- */
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/* -------------------------------------- */
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/* ----- ATA (Alternate) Status Register */
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#define ATA_SR_BSY 0x80 /* Busy */
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#define ATA_SR_DRDY 0x40 /* Device Ready */
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#define ATA_SR_DF 0x20 /* Device Fault */
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#define ATA_SR_DSC 0x10 /* Device Seek Complete */
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#define ATA_SR_DRQ 0x08 /* Data Request */
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#define ATA_SR_COR 0x04 /* Corrected data (obsolete) */
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#define ATA_SR_IDX 0x02 /* (obsolete) */
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#define ATA_SR_ERR 0x01 /* Error */
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/* ----- ATA Device Control Register */
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/* bits 7-3 are reserved */
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#define ATA_DCR_RST 0x04 /* Software reset (RST=1, reset) */
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#define ATA_DCR_IEN 0x02 /* Interrupt Enable (IEN=0, enabled) */
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/* always write a '0' to bit0 */
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/* ----- ATA Device Address Register */
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/* All values in this register are one's complement (i.e. inverted) */
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#define ATA_DAR_WTG 0x40 /* Write Gate */
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#define ATA_DAR_H 0x3c /* Head Select */
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#define ATA_DAR_DS1 0x02 /* Drive select 1 */
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#define ATA_DAR_DS0 0x01 /* Drive select 0 */
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/* ----- Device/Head Register */
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#define ATA_DHR_LBA 0x40 /* LBA/CHS mode ('1'=LBA mode) */
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#define ATA_DHR_DEV 0x10 /* Device ('0'=dev0, '1'=dev1) */
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#define ATA_DHR_H 0x0f /* Head Select */
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/* ----- Error Register */
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#define ATA_ERR_BBK 0x80 /* Bad Block */
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#define ATA_ERR_UNC 0x40 /* Uncorrectable Data Error */
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#define ATA_ERR_IDNF 0x10 /* ID Not Found */
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#define ATA_ERR_ABT 0x04 /* Aborted Command */
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#define ATA_ERR_TON 0x02 /* Track0 Not Found */
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#define ATA_ERR_AMN 0x01 /* Address Mark Not Found */
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/* -------------------------- */
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/* ----- Device Defines ----- */
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/* -------------------------- */
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/* types for hard disk simulation */
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#define TYPE_NO_CONNECT 0
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#define TYPE_FILE 1
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#define TYPE_LOCAL 2
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/* ----------------------------- */
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/* ----- Statemachine defines -- */
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/* ----------------------------- */
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#define ATA_STATE_IDLE 0x00
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#define ATA_STATE_SW_RST 0x01
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#define ATA_STATE_HW_RST 0x02
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/* ---------------------------- */
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/* ----- Structs ----- */
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/* ---------------------------- */
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struct ata_device
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{
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/******* Housekeeping *****************************************/
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struct
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{
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/* Pointer to host that device is attached to */
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void *host;
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/* device number */
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int dev;
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/* current PIO mode */
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int pio_mode;
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/* current DMA mode */
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int dma_mode;
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/* databuffer */
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uint16_t dbuf[4096];
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uint16_t *dbuf_ptr;
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uint16_t dbuf_cnt;
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/* current statemachine state */
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int state;
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/* current CHS translation settings */
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unsigned int heads_per_cylinder;
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unsigned int sectors_per_track;
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/* Current byte being read */
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uint32_t lba;
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/* Number of sectors still needing to be read */
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int nr_sect;
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/* function to call when block of data has been transfered */
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void (*end_t_func) (struct ata_device *);
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} internals;
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/******* ATA Device Registers *********************************/
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struct
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{
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uint8_t command;
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uint8_t cylinder_low;
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uint8_t cylinder_high;
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uint8_t device_control;
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uint8_t device_head;
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uint8_t error;
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uint8_t features;
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uint8_t sector_count;
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uint8_t sector_number;
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uint8_t status;
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uint16_t dataport_i;
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} regs;
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/******** ata device output signals **************************/
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struct
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{
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int iordy;
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int intrq;
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int dmarq;
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int pdiagi, pdiago;
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int daspi, daspo;
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} sigs;
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/******** simulator settings **********************************/
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struct
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{
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char *file; /* Filename (if type == FILE) */
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FILE *stream; /* stream where the simulated device connects to */
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int type; /* Simulate device using */
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/* NO_CONNECT: no device connected (dummy) */
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/* FILE : a file */
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/* LOCAL : a local stream, e.g./dev/hda1 */
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uint32_t size; /* size in bytes of the simulated device */
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uint32_t size_sect; /* size in sectors of the simulated device */
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int packet; /* device implements PACKET command set */
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unsigned int heads;
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unsigned int sectors;
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char *firmware;
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unsigned int mwdma;
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unsigned int pio;
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} conf;
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};
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struct ata_devices
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{
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struct ata_device device[2];
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};
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/* all devices */
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void ata_devices_init (struct ata_devices *devices);
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void ata_devices_hw_reset (struct ata_devices *devices, int reset_signal);
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short ata_devices_read (struct ata_devices *devices, char adr);
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void ata_devices_write (struct ata_devices *devices, char adr, short value);
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#endif /* ATADEVICE__H */
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