327 lines
6.8 KiB
C
327 lines
6.8 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2002 by Alan Korr
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include <stdbool.h>
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#include "ata.h"
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#include "kernel.h"
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#include "led.h"
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#include "sh7034.h"
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#include "system.h"
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#include "debug.h"
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#define ATA_DATA (*((volatile unsigned short*)0x06104100))
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#define ATA_ERROR (*((volatile unsigned char*)0x06100101))
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#define ATA_FEATURE ATA_ERROR
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#define ATA_NSECTOR (*((volatile unsigned char*)0x06100102))
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#define ATA_SECTOR (*((volatile unsigned char*)0x06100103))
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#define ATA_LCYL (*((volatile unsigned char*)0x06100104))
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#define ATA_HCYL (*((volatile unsigned char*)0x06100105))
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#define ATA_SELECT (*((volatile unsigned char*)0x06100106))
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#define ATA_COMMAND (*((volatile unsigned char*)0x06100107))
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#define ATA_STATUS (*((volatile unsigned char*)0x06100107))
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#define ATA_CONTROL (*((volatile unsigned char*)0x06200306))
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#define ATA_ALT_STATUS ATA_CONTROL
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#define SELECT_LBA 0x40
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#define STATUS_BSY 0x80
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#define STATUS_RDY 0x40
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#define STATUS_DRQ 0x08
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#define STATUS_ERR 0x01
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#define CONTROL_nIEN 0x02
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#define CONTROL_SRST 0x04
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#define CMD_READ_SECTORS 0x20
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#define CMD_WRITE_SECTORS 0x30
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#define CMD_STANDBY_IMMEDIATE 0xE0
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#define CMD_STANDBY 0xE2
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#define CMD_SLEEP 0xE6
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#define CMD_SECURITY_FREEZE_LOCK 0xF5
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struct mutex ata_mtx;
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static int wait_for_bsy(void)
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{
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int timeout = current_tick + HZ*4;
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while (TIME_BEFORE(current_tick, timeout) && (ATA_ALT_STATUS & STATUS_BSY))
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yield();
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if (TIME_BEFORE(current_tick, timeout))
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{
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return 1;
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}
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else
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{
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return 0; /* timeout */
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}
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}
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static int wait_for_rdy(void)
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{
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if (!wait_for_bsy())
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return 0;
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return ATA_ALT_STATUS & STATUS_RDY;
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}
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static int wait_for_start_of_transfer(void)
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{
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if (!wait_for_bsy())
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return 0;
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return (ATA_ALT_STATUS & (STATUS_BSY|STATUS_DRQ)) == STATUS_DRQ;
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}
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static int wait_for_end_of_transfer(void)
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{
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if (!wait_for_bsy())
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return 0;
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return (ATA_ALT_STATUS & (STATUS_RDY|STATUS_DRQ)) == STATUS_RDY;
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}
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int ata_read_sectors(unsigned long start,
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unsigned char count,
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void* buf)
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{
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int i;
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int ret = 0;
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mutex_lock(&ata_mtx);
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if (!wait_for_rdy())
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{
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mutex_unlock(&ata_mtx);
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return -1;
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}
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led(true);
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ATA_NSECTOR = count;
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ATA_SECTOR = start & 0xff;
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ATA_LCYL = (start >> 8) & 0xff;
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ATA_HCYL = (start >> 16) & 0xff;
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ATA_SELECT = ((start >> 24) & 0xf) | SELECT_LBA;
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ATA_COMMAND = CMD_READ_SECTORS;
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for (i=0; i<count; i++) {
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int j;
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if (!wait_for_start_of_transfer())
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{
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mutex_unlock(&ata_mtx);
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return -1;
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}
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for (j=0; j<256; j++)
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((unsigned short*)buf)[j] = SWAB16(ATA_DATA);
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#ifdef USE_INTERRUPT
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/* reading the status register clears the interrupt */
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j = ATA_STATUS;
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#endif
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}
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led(false);
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if(!wait_for_end_of_transfer())
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ret = -1;
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mutex_unlock(&ata_mtx);
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return ret;
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}
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#ifdef DISK_WRITE
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int ata_write_sectors(unsigned long start,
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unsigned char count,
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void* buf)
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{
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int i;
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mutex_lock(&ata_mtx);
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if (!wait_for_rdy())
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{
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mutex_unlock(&ata_mtx);
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return 0;
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}
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led(true);
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ATA_NSECTOR = count;
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ATA_SECTOR = start & 0xff;
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ATA_LCYL = (start >> 8) & 0xff;
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ATA_HCYL = (start >> 16) & 0xff;
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ATA_SELECT = ((start >> 24) & 0xf) | SELECT_LBA;
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ATA_COMMAND = CMD_WRITE_SECTORS;
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for (i=0; i<count; i++) {
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int j;
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if (!wait_for_start_of_transfer())
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{
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mutex_unlock(&ata_mtx);
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return 0;
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}
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for (j=0; j<256; j++)
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ATA_DATA = SWAB16(((unsigned short*)buf)[j]);
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#ifdef USE_INTERRUPT
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/* reading the status register clears the interrupt */
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j = ATA_STATUS;
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#endif
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}
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led(false);
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i = wait_for_end_of_transfer();
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mutex_unlock(&ata_mtx);
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return i;
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}
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#endif
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static int check_registers(void)
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{
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int ret = 0;
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mutex_lock(&ata_mtx);
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if ( ATA_STATUS & STATUS_BSY )
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{
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mutex_unlock(&ata_mtx);
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return 0;
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}
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ATA_NSECTOR = 0xa5;
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ATA_SECTOR = 0x5a;
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ATA_LCYL = 0xaa;
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ATA_HCYL = 0x55;
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if ((ATA_NSECTOR == 0xa5) &&
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(ATA_SECTOR == 0x5a) &&
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(ATA_LCYL == 0xaa) &&
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(ATA_HCYL == 0x55))
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ret = 1;
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mutex_unlock(&ata_mtx);
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return ret;
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}
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static int freeze_lock(void)
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{
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if (!wait_for_rdy())
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return -1;
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ATA_COMMAND = CMD_SECURITY_FREEZE_LOCK;
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if (!wait_for_rdy())
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return -1;
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return 0;
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}
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int ata_spindown(int time)
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{
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int ret = 0;
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mutex_lock(&ata_mtx);
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if(!wait_for_rdy())
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{
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mutex_unlock(&ata_mtx);
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return -1;
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}
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if ( time == -1 ) {
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ATA_COMMAND = CMD_STANDBY_IMMEDIATE;
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}
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else {
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if (time > 255)
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{
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mutex_unlock(&ata_mtx);
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return -1;
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}
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ATA_NSECTOR = time & 0xff;
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ATA_COMMAND = CMD_STANDBY;
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}
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if (!wait_for_rdy())
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ret = -1;
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mutex_unlock(&ata_mtx);
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return ret;
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}
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int ata_hard_reset(void)
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{
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int ret;
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mutex_lock(&ata_mtx);
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PADR &= ~0x0002;
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sleep(2);
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PADR |= 0x0002;
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ret = wait_for_rdy();
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mutex_unlock(&ata_mtx);
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return ret;
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}
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int ata_soft_reset(void)
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{
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int ret;
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mutex_lock(&ata_mtx);
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ATA_SELECT = SELECT_LBA;
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ATA_CONTROL = CONTROL_nIEN|CONTROL_SRST;
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sleep(HZ/20000); /* >= 5us */
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ATA_CONTROL = CONTROL_nIEN;
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sleep(HZ/400); /* >2ms */
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ret = wait_for_rdy();
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mutex_unlock(&ata_mtx);
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return ret;
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}
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int ata_init(void)
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{
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mutex_init(&ata_mtx);
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led(false);
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/* activate ATA */
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PADR &= ~0x80;
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if (!ata_hard_reset())
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return -1;
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if (!check_registers())
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return -2;
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if (freeze_lock() < 0)
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return -4;
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ATA_SELECT = SELECT_LBA;
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ATA_CONTROL = CONTROL_nIEN;
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return 0;
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}
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