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foxbox/firmware/drivers/ata.c

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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2002 by Alan Korr
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include <stdbool.h>
#include "ata.h"
#include "kernel.h"
#include "thread.h"
#include "led.h"
#include "sh7034.h"
#include "system.h"
#include "debug.h"
#include "panic.h"
#include "usb.h"
#include "power.h"
#include "string.h"
#include "hwcompat.h"
#define SECTOR_SIZE 512
#define ATA_DATA (*((volatile unsigned short*)0x06104100))
#define ATA_ERROR (*((volatile unsigned char*)0x06100101))
#define ATA_FEATURE ATA_ERROR
#define ATA_NSECTOR (*((volatile unsigned char*)0x06100102))
#define ATA_SECTOR (*((volatile unsigned char*)0x06100103))
#define ATA_LCYL (*((volatile unsigned char*)0x06100104))
#define ATA_HCYL (*((volatile unsigned char*)0x06100105))
#define ATA_SELECT (*((volatile unsigned char*)0x06100106))
#define ATA_COMMAND (*((volatile unsigned char*)0x06100107))
#define ATA_STATUS (*((volatile unsigned char*)0x06100107))
#define ATA_CONTROL1 ((volatile unsigned char*)0x06200206)
#define ATA_CONTROL2 ((volatile unsigned char*)0x06200306)
#define ATA_CONTROL (*ata_control)
#define ATA_ALT_STATUS ATA_CONTROL
#define SELECT_DEVICE1 0x10
#define SELECT_LBA 0x40
#define STATUS_BSY 0x80
#define STATUS_RDY 0x40
#define STATUS_DF 0x20
#define STATUS_DRQ 0x08
#define STATUS_ERR 0x01
#define CONTROL_nIEN 0x02
#define CONTROL_SRST 0x04
#define CMD_READ_SECTORS 0x20
#define CMD_WRITE_SECTORS 0x30
#define CMD_READ_MULTIPLE 0xC4
#define CMD_WRITE_MULTIPLE 0xC5
#define CMD_SET_MULTIPLE_MODE 0xC6
#define CMD_STANDBY_IMMEDIATE 0xE0
#define CMD_STANDBY 0xE2
#define CMD_IDENTIFY 0xEC
#define CMD_SLEEP 0xE6
#define CMD_SET_FEATURES 0xEF
#define CMD_SECURITY_FREEZE_LOCK 0xF5
#define Q_SLEEP 0
#define READ_TIMEOUT 5*HZ
static struct mutex ata_mtx;
char ata_device; /* device 0 (master) or 1 (slave) */
int ata_io_address; /* 0x300 or 0x200, only valid on recorder */
static volatile unsigned char* ata_control;
bool old_recorder = false;
int ata_spinup_time = 0;
static bool spinup = false;
static bool sleeping = true;
static int sleep_timeout = 5*HZ;
static bool poweroff = false;
#ifdef HAVE_ATA_POWER_OFF
static int poweroff_timeout = 2*HZ;
#endif
static char ata_stack[DEFAULT_STACK_SIZE];
static char ata_thread_name[] = "ata";
static struct event_queue ata_queue;
static bool initialized = false;
static bool delayed_write = false;
static unsigned char delayed_sector[SECTOR_SIZE];
static int delayed_sector_num;
static long last_user_activity = -1;
long last_disk_activity = -1;
static int multisectors; /* number of supported multisectors */
static unsigned short identify_info[SECTOR_SIZE];
static int ata_power_on(void);
static int perform_soft_reset(void);
static int set_multiple_mode(int sectors);
static int wait_for_bsy(void) __attribute__ ((section (".icode")));
static int wait_for_bsy(void)
{
int timeout = current_tick + HZ*10;
while (TIME_BEFORE(current_tick, timeout) && (ATA_STATUS & STATUS_BSY)) {
last_disk_activity = current_tick;
yield();
}
if (TIME_BEFORE(current_tick, timeout))
return 1;
else
return 0; /* timeout */
}
static int wait_for_rdy(void) __attribute__ ((section (".icode")));
static int wait_for_rdy(void)
{
int timeout;
if (!wait_for_bsy())
return 0;
timeout = current_tick + HZ*10;
while (TIME_BEFORE(current_tick, timeout) &&
!(ATA_ALT_STATUS & STATUS_RDY)) {
last_disk_activity = current_tick;
yield();
}
if (TIME_BEFORE(current_tick, timeout))
return STATUS_RDY;
else
return 0; /* timeout */
}
static int wait_for_start_of_transfer(void) __attribute__ ((section (".icode")));
static int wait_for_start_of_transfer(void)
{
if (!wait_for_bsy())
return 0;
return (ATA_ALT_STATUS & (STATUS_BSY|STATUS_DRQ)) == STATUS_DRQ;
}
static int wait_for_end_of_transfer(void) __attribute__ ((section (".icode")));
static int wait_for_end_of_transfer(void)
{
if (!wait_for_bsy())
return 0;
return (ATA_ALT_STATUS & (STATUS_RDY|STATUS_DRQ)) == STATUS_RDY;
}
/*
0x090156A8: 0x4F22 sts.l pr,@-r15
0x090156AA: 0x6243 mov r4,r2
0x090156AC: 0x6023 mov r2,r0
0x090156AE: 0xC901 and #0x01,r0
0x090156B0: 0x2008 tst r0,r0
0x090156B2: 0x8911 bt 0x090156D8
0x090156B4: 0x6153 mov r5,r1
0x090156B6: 0x311C add r1,r1
0x090156B8: 0x6523 mov r2,r5
0x090156BA: 0x351C add r1,r5
0x090156BC: 0xD30E mov.l @(0x03C,pc),r3 ; 0x090156F8 (0x06104100)
0x090156BE: 0x0009 nop
0x090156C0: 0x6131 mov.w @r3,r1
0x090156C2: 0x611D extu.w r1,r1
0x090156C4: 0x2210 mov.b r1,@r2
0x090156C6: 0x7201 add #0x01,r2
0x090156C8: 0x4119 shlr8 r1
0x090156CA: 0x2210 mov.b r1,@r2
0x090156CC: 0x7201 add #0x01,r2
0x090156CE: 0x3252 cmp/hs r5,r2
0x090156D0: 0x8BF6 bf 0x090156C0
0x090156D2: 0xA00F bra 0x090156F4
0x090156D4: 0x4F26 lds.l @r15+,pr
0x090156D6: 0x0009 nop
0x090156D8: 0x6423 mov r2,r4
0x090156DA: 0x6153 mov r5,r1
0x090156DC: 0x311C add r1,r1
0x090156DE: 0x6543 mov r4,r5
0x090156E0: 0x351C add r1,r5
0x090156E2: 0xD205 mov.l @(0x018,pc),r2 ; 0x090156F8 (0x06104100)
0x090156E4: 0x6121 mov.w @r2,r1
0x090156E6: 0x611F exts.w r1,r1
0x090156E8: 0x6118 swap.b r1,r1
0x090156EA: 0x2411 mov.w r1,@r4
0x090156EC: 0x7402 add #0x02,r4
0x090156EE: 0x3452 cmp/hs r5,r4
0x090156F0: 0x8BF8 bf 0x090156E4
0x090156F2: 0x4F26 lds.l @r15+,pr
0x090156F4: 0x000B rts
0x090156F6: 0x0009 nop
0x090156F8: 0x0610 .long 0x06104100 ; 0x090156E0
0x090156FA: 0x4100
*/
/* the tight loop of ata_read_sectors(), to avoid the whole in IRAM */
static void copy_read_sectors(unsigned char* buf,
int wordcount)
__attribute__ ((section (".icode")));
static void copy_read_sectors(unsigned char* buf, int wordcount)
{
unsigned short tmp = 0; /* have to init to prevent warning? */
if ( (unsigned int)buf & 1)
{ /* not 16-bit aligned, copy byte by byte */
unsigned char* bufend = buf + wordcount*2;
#ifdef PREFER_C
do
{ /* loop compiles to 9 assembler instructions */
tmp = ATA_DATA;
*buf++ = tmp & 0xff; /* I assume big endian */
*buf++ = tmp >> 8; /* and don't use the SWAB16 macro */
} while (buf < bufend); /* tail loop is faster */
#else
asm (
"mov #1, r0 \n"
"loop_b: \n"
"mov.w @%1,%0 \n"
"mov.b %0,@%2 \n"
"shlr8 %0 \n"
"mov.b %0,@(r0,%2) \n"
"add #0x02,%2 \n"
"cmp/hs %3,%2 \n"
"bf loop_b \n"
: /* outputs */
: /* inputs */
/* %0 */ "r"(tmp),
/* %1 */ "r"(&ATA_DATA),
/* %2 */ "r"(buf),
/* %3 */ "r"(bufend)
: /* trashed */
"r0"
);
#endif
}
else
{ /* 16-bit aligned, can do faster copy */
unsigned short* wbuf = (unsigned short*)buf;
unsigned short* wbufend = wbuf + wordcount;
#ifdef PREFER_C
do
{ /* loop compiles to 7 assembler instructions */
*wbuf = SWAB16(ATA_DATA);
} while (++wbuf < wbufend); /* tail loop is faster */
#else
asm (
"mov #2, r0 \n"
"loop_w: \n"
"mov.w @%1,%0 \n"
"swap.b %0,%0 \n"
"mov.w %0,@%2 \n"
"mov.w @%1,%0 \n" /* unrolled, do one more */
"swap.b %0,%0 \n"
"mov.w %0,@(r0,%2) \n"
"add #0x04,%2 \n"
"cmp/hs %3,%2 \n"
"bf loop_w \n"
: /* outputs */
: /* inputs */
/* %0 */ "r"(tmp),
/* %1 */ "r"(&ATA_DATA),
/* %2 */ "r"(wbuf),
/* %3 */ "r"(wbufend)
: /* trashed */
"r0"
);
#endif
}
}
int ata_read_sectors(unsigned long start,
int incount,
void* inbuf)
{
int ret = 0;
int timeout;
int count;
void* buf;
int spinup_start;
mutex_lock(&ata_mtx);
last_disk_activity = current_tick;
spinup_start = current_tick;
led(true);
if ( sleeping ) {
spinup = true;
if (poweroff) {
if (ata_power_on()) {
mutex_unlock(&ata_mtx);
led(false);
return -1;
}
}
else {
if (perform_soft_reset()) {
mutex_unlock(&ata_mtx);
led(false);
return -1;
}
}
}
timeout = current_tick + READ_TIMEOUT;
ATA_SELECT = ata_device;
if (!wait_for_rdy())
{
mutex_unlock(&ata_mtx);
led(false);
return -2;
}
retry:
buf = inbuf;
count = incount;
while (TIME_BEFORE(current_tick, timeout)) {
ret = 0;
last_disk_activity = current_tick;
if ( count == 256 )
ATA_NSECTOR = 0; /* 0 means 256 sectors */
else
ATA_NSECTOR = (unsigned char)count;
ATA_SECTOR = start & 0xff;
ATA_LCYL = (start >> 8) & 0xff;
ATA_HCYL = (start >> 16) & 0xff;
ATA_SELECT = ((start >> 24) & 0xf) | SELECT_LBA | ata_device;
ATA_COMMAND = CMD_READ_MULTIPLE;
/* wait at least 400ns between writing command and reading status */
asm volatile ("nop");
asm volatile ("nop");
asm volatile ("nop");
asm volatile ("nop");
asm volatile ("nop");
while (count) {
int sectors;
int wordcount;
int status;
if (!wait_for_start_of_transfer()) {
ret = -4;
goto retry;
}
if (spinup) {
ata_spinup_time = current_tick - spinup_start;
spinup = false;
sleeping = false;
poweroff = false;
}
/* read the status register exactly once per loop */
status = ATA_STATUS;
/* if destination address is odd, use byte copying,
otherwise use word copying */
if (count >= multisectors )
sectors = multisectors;
else
sectors = count;
wordcount = sectors * SECTOR_SIZE / 2;
copy_read_sectors(buf, wordcount);
/*
"Device errors encountered during READ MULTIPLE commands are
posted at the beginning of the block or partial block transfer,
but the DRQ bit is still set to one and the data transfer shall
take place, including transfer of corrupted data, if any."
-- ATA specification
*/
if ( status & (STATUS_BSY | STATUS_ERR | STATUS_DF) ) {
ret = -5;
goto retry;
}
buf += sectors * SECTOR_SIZE; /* Advance one chunk of sectors */
count -= sectors;
last_disk_activity = current_tick;
}
if(!ret && !wait_for_end_of_transfer()) {
ret = -3;
goto retry;
}
break;
}
led(false);
mutex_unlock(&ata_mtx);
/* only flush if reading went ok */
if ( (ret == 0) && delayed_write )
ata_flush();
return ret;
}
int ata_write_sectors(unsigned long start,
int count,
void* buf)
{
int i;
int ret = 0;
int spinup_start;
if (start == 0)
panicf("Writing on sector 0\n");
mutex_lock(&ata_mtx);
last_disk_activity = current_tick;
spinup_start = current_tick;
led(true);
if ( sleeping ) {
spinup = true;
if (poweroff) {
if (ata_power_on()) {
mutex_unlock(&ata_mtx);
led(false);
return -1;
}
}
else {
if (perform_soft_reset()) {
mutex_unlock(&ata_mtx);
led(false);
return -1;
}
}
}
ATA_SELECT = ata_device;
if (!wait_for_rdy())
{
mutex_unlock(&ata_mtx);
led(false);
return -2;
}
if ( count == 256 )
ATA_NSECTOR = 0; /* 0 means 256 sectors */
else
ATA_NSECTOR = (unsigned char)count;
ATA_SECTOR = start & 0xff;
ATA_LCYL = (start >> 8) & 0xff;
ATA_HCYL = (start >> 16) & 0xff;
ATA_SELECT = ((start >> 24) & 0xf) | SELECT_LBA | ata_device;
ATA_COMMAND = CMD_WRITE_SECTORS;
for (i=0; i<count; i++) {
int j;
if (!wait_for_start_of_transfer()) {
ret = -3;
break;
}
if (spinup) {
ata_spinup_time = current_tick - spinup_start;
spinup = false;
sleeping = false;
poweroff = false;
}
for (j=0; j<SECTOR_SIZE/2; j++) {
ATA_DATA = (unsigned short)
(((unsigned char *)buf)[j*2+1] << 8) |
((unsigned char *)buf)[j*2];
}
#ifdef USE_INTERRUPT
/* reading the status register clears the interrupt */
j = ATA_STATUS;
#endif
buf += SECTOR_SIZE;
last_disk_activity = current_tick;
}
if(!ret && !wait_for_end_of_transfer())
ret = -4;
led(false);
mutex_unlock(&ata_mtx);
/* only flush if writing went ok */
if ( (ret == 0) && delayed_write )
ata_flush();
return ret;
}
extern void ata_delayed_write(unsigned long sector, void* buf)
{
memcpy(delayed_sector, buf, SECTOR_SIZE);
delayed_sector_num = sector;
delayed_write = true;
}
extern void ata_flush(void)
{
if ( delayed_write ) {
DEBUGF("ata_flush()\n");
delayed_write = false;
ata_write_sectors(delayed_sector_num, 1, delayed_sector);
}
}
static int check_registers(void)
{
if ( ATA_STATUS & STATUS_BSY )
return -1;
ATA_NSECTOR = 0xa5;
ATA_SECTOR = 0x5a;
ATA_LCYL = 0xaa;
ATA_HCYL = 0x55;
if ((ATA_NSECTOR == 0xa5) &&
(ATA_SECTOR == 0x5a) &&
(ATA_LCYL == 0xaa) &&
(ATA_HCYL == 0x55))
return 0;
return -2;
}
static int freeze_lock(void)
{
ATA_SELECT = ata_device;
if (!wait_for_rdy())
return -1;
ATA_COMMAND = CMD_SECURITY_FREEZE_LOCK;
if (!wait_for_rdy())
return -2;
return 0;
}
void ata_spindown(int seconds)
{
sleep_timeout = seconds * HZ;
}
#ifdef HAVE_ATA_POWER_OFF
void ata_poweroff(bool enable)
{
if (enable)
poweroff_timeout = 2*HZ;
else
poweroff_timeout = 0;
}
#endif
bool ata_disk_is_active(void)
{
return !sleeping;
}
static int ata_perform_sleep(void)
{
int ret = 0;
mutex_lock(&ata_mtx);
ATA_SELECT = ata_device;
if(!wait_for_rdy()) {
DEBUGF("ata_perform_sleep() - not RDY\n");
mutex_unlock(&ata_mtx);
return -1;
}
ATA_COMMAND = CMD_SLEEP;
if (!wait_for_rdy())
{
DEBUGF("ata_perform_sleep() - CMD failed\n");
ret = -2;
}
sleeping = true;
mutex_unlock(&ata_mtx);
return ret;
}
int ata_standby(int time)
{
int ret = 0;
mutex_lock(&ata_mtx);
ATA_SELECT = ata_device;
if(!wait_for_rdy()) {
DEBUGF("ata_standby() - not RDY\n");
mutex_unlock(&ata_mtx);
return -1;
}
ATA_NSECTOR = ((time + 5) / 5) & 0xff; /* Round up to nearest 5 secs */
ATA_COMMAND = CMD_STANDBY;
if (!wait_for_rdy())
{
DEBUGF("ata_standby() - CMD failed\n");
ret = -2;
}
mutex_unlock(&ata_mtx);
return ret;
}
int ata_sleep(void)
{
queue_post(&ata_queue, Q_SLEEP, NULL);
return 0;
}
void ata_spin(void)
{
last_user_activity = current_tick;
}
static void ata_thread(void)
{
static long last_sleep = 0;
struct event ev;
while (1) {
while ( queue_empty( &ata_queue ) ) {
if ( !spinup && sleep_timeout && !sleeping &&
TIME_AFTER( current_tick,
last_user_activity + sleep_timeout ) &&
TIME_AFTER( current_tick,
last_disk_activity + sleep_timeout ) )
{
ata_perform_sleep();
last_sleep = current_tick;
}
#ifdef HAVE_ATA_POWER_OFF
if ( !spinup && sleeping && poweroff_timeout && !poweroff &&
TIME_AFTER( current_tick, last_sleep + poweroff_timeout ))
{
mutex_lock(&ata_mtx);
ide_power_enable(false);
mutex_unlock(&ata_mtx);
poweroff = true;
}
#endif
sleep(HZ/4);
}
queue_wait(&ata_queue, &ev);
switch ( ev.id ) {
#ifndef USB_NONE
case SYS_USB_CONNECTED:
if (poweroff) {
mutex_lock(&ata_mtx);
led(true);
ata_power_on();
led(false);
mutex_unlock(&ata_mtx);
}
/* Tell the USB thread that we are safe */
DEBUGF("ata_thread got SYS_USB_CONNECTED\n");
usb_acknowledge(SYS_USB_CONNECTED_ACK);
/* Wait until the USB cable is extracted again */
usb_wait_for_disconnect(&ata_queue);
break;
#endif
case Q_SLEEP:
last_disk_activity = current_tick - sleep_timeout + (HZ/2);
break;
}
}
}
/* Hardware reset protocol as specified in chapter 9.1, ATA spec draft v5 */
int ata_hard_reset(void)
{
int ret;
/* state HRR0 */
and_b(~0x02, &PADRH); /* assert _RESET */
sleep(1); /* > 25us */
/* state HRR1 */
or_b(0x02, &PADRH); /* negate _RESET */
sleep(1); /* > 2ms */
/* state HRR2 */
ATA_SELECT = ata_device; /* select the right device */
ret = wait_for_bsy();
/* Massage the return code so it is 0 on success and -1 on failure */
ret = ret?0:-1;
return ret;
}
static int perform_soft_reset(void)
{
int ret;
int retry_count;
ATA_SELECT = SELECT_LBA | ata_device;
ATA_CONTROL = CONTROL_nIEN|CONTROL_SRST;
sleep(1); /* >= 5us */
ATA_CONTROL = CONTROL_nIEN;
sleep(1); /* >2ms */
/* This little sucker can take up to 30 seconds */
retry_count = 8;
do
{
ret = wait_for_rdy();
} while(!ret && retry_count--);
/* Massage the return code so it is 0 on success and -1 on failure */
ret = ret?0:-1;
return ret;
}
int ata_soft_reset(void)
{
int ret;
mutex_lock(&ata_mtx);
ret = perform_soft_reset();
mutex_unlock(&ata_mtx);
return ret;
}
static int ata_power_on(void)
{
ide_power_enable(true);
if( ata_hard_reset() )
return -1;
if (set_multiple_mode(multisectors))
return -2;
if (freeze_lock())
return -3;
return 0;
}
static int master_slave_detect(void)
{
/* master? */
ATA_SELECT = 0;
if ( ATA_STATUS & (STATUS_RDY|STATUS_BSY) ) {
ata_device = 0;
DEBUGF("Found master harddisk\n");
}
else {
/* slave? */
ATA_SELECT = SELECT_DEVICE1;
if ( ATA_STATUS & (STATUS_RDY|STATUS_BSY) ) {
ata_device = SELECT_DEVICE1;
DEBUGF("Found slave harddisk\n");
}
else
return -1;
}
return 0;
}
static int io_address_detect(void)
{ /* now, use the HW mask instead of probing */
if (read_hw_mask() & ATA_ADDRESS_200)
{
ata_io_address = 0x200; /* For debug purposes only */
old_recorder = false;
ata_control = ATA_CONTROL1;
}
else
{
ata_io_address = 0x300; /* For debug purposes only */
old_recorder = true;
ata_control = ATA_CONTROL2;
}
return 0;
}
void ata_enable(bool on)
{
if(on)
and_b(~0x80, &PADRL); /* enable ATA */
else
or_b(0x80, &PADRL); /* disable ATA */
or_b(0x80, &PAIORL);
}
static int identify(void)
{
int i;
ATA_SELECT = ata_device;
if(!wait_for_rdy()) {
DEBUGF("identify() - not RDY\n");
return -1;
}
ATA_COMMAND = CMD_IDENTIFY;
if (!wait_for_start_of_transfer())
{
DEBUGF("identify() - CMD failed\n");
return -2;
}
for (i=0; i<SECTOR_SIZE/2; i++)
/* the IDENTIFY words are already swapped */
identify_info[i] = ATA_DATA;
return 0;
}
static int set_multiple_mode(int sectors)
{
ATA_SELECT = ata_device;
if(!wait_for_rdy()) {
DEBUGF("set_multiple_mode() - not RDY\n");
return -1;
}
ATA_NSECTOR = sectors;
ATA_COMMAND = CMD_SET_MULTIPLE_MODE;
if (!wait_for_rdy())
{
DEBUGF("set_multiple_mode() - CMD failed\n");
return -2;
}
return 0;
}
static int set_features(void)
{
struct {
unsigned char id_word;
unsigned char id_bit;
unsigned char subcommand;
unsigned char parameter;
} features[] = {
{ 83, 3, 0x05, 1 }, /* power management: lowest power */
{ 83, 9, 0x42, 0x80 }, /* acoustic management: lowest noise */
{ 82, 6, 0xaa, 0 }, /* enable read look-ahead */
{ 0, 0, 0, 0 } /* <end of list> */
};
int i;
ATA_SELECT = ata_device;
if (!wait_for_rdy()) {
DEBUGF("set_features() - not RDY\n");
return -1;
}
for (i=0; features[i].id_word; i++) {
if (identify_info[features[i].id_word] & (1 << features[i].id_bit)) {
ATA_FEATURE = features[i].subcommand;
ATA_NSECTOR = features[i].parameter;
ATA_COMMAND = CMD_SET_FEATURES;
if (!wait_for_rdy()) {
DEBUGF("set_features() - CMD failed\n");
return -2 - i;
}
}
}
return 0;
}
unsigned short* ata_get_identify(void)
{
return identify_info;
}
int ata_init(void)
{
int rc;
bool coldstart = (PACR2 & 0x4000) != 0;
mutex_init(&ata_mtx);
led(false);
/* Port A setup */
or_b(0x02, &PAIORH); /* output for ATA reset */
or_b(0x02, &PADRH); /* release ATA reset */
PACR2 &= 0xBFFF; /* GPIO function for PA7 (IDE enable) */
sleeping = false;
ata_enable(true);
if ( !initialized ) {
if (!ide_powered()) /* somebody has switched it off */
{
ide_power_enable(true);
sleep(HZ); /* allow voltage to build up */
}
if (coldstart)
{
/* Reset both master and slave, we don't yet know what's in */
/* this is safe because non-present devices don't report busy */
ata_device = 0;
if (ata_hard_reset())
return -1;
ata_device = SELECT_DEVICE1;
if (ata_hard_reset())
return -2;
}
rc = master_slave_detect();
if (rc)
return -10 + rc;
rc = io_address_detect();
if (rc)
return -20 + rc;
/* symptom fix: else check_registers() below may fail */
if (coldstart && !wait_for_bsy())
{
return -29;
}
rc = check_registers();
if (rc)
return -30 + rc;
rc = freeze_lock();
if (rc)
return -40 + rc;
rc = identify();
if (rc)
return -50 + rc;
multisectors = identify_info[47] & 0xff;
DEBUGF("ata: %d sectors per ata request\n",multisectors);
rc = set_features();
if (rc)
return -60 + rc;
queue_init(&ata_queue);
last_disk_activity = current_tick;
create_thread(ata_thread, ata_stack,
sizeof(ata_stack), ata_thread_name);
initialized = true;
}
rc = set_multiple_mode(multisectors);
if (rc)
return -70 + rc;
return 0;
}
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