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rockbox/firmware/drivers/ata.c
Björn Stenberg bb6e51aa0d Moved read code around a bit to more strictly obey the ATA specification. 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@3444 a1c6a512-1295-4272-9138-f99709370657
2003-03-14 16:06:09 +00:00

787 lines
19 KiB
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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"
#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_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 = false;
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_ALT_STATUS & STATUS_BSY))
sleep_thread();
wake_up_thread();
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))
sleep_thread();
wake_up_thread();
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;
}
int ata_read_sectors(unsigned long start,
int count,
void* buf) __attribute__ ((section (".icode")));
int ata_read_sectors(unsigned long start,
int incount,
void* inbuf)
{
int ret = 0;
int timeout;
int count;
void* buf;
mutex_lock(&ata_mtx);
last_disk_activity = current_tick;
led(true);
if ( sleeping ) {
spinup = true;
if (poweroff) {
if (ata_power_on()) {
mutex_unlock(&ata_mtx);
return -1;
}
}
else {
if (perform_soft_reset()) {
mutex_unlock(&ata_mtx);
return -1;
}
}
}
timeout = current_tick + READ_TIMEOUT;
retry:
ATA_SELECT = ata_device;
if (!wait_for_rdy())
{
mutex_unlock(&ata_mtx);
return -2;
}
buf = inbuf;
count = incount;
while (TIME_BEFORE(current_tick, timeout)) {
ret = 0;
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;
while (count) {
int j;
int sectors;
int wordcount;
int status;
if (!wait_for_start_of_transfer()) {
ret = -4;
goto retry;
}
if (spinup) {
ata_spinup_time = current_tick - last_disk_activity;
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;
if ( (unsigned int)buf & 1 ) {
for (j=0; j < wordcount; j++) {
unsigned short tmp = SWAB16(ATA_DATA);
((unsigned char*)buf)[j*2] = tmp >> 8;
((unsigned char*)buf)[j*2+1] = tmp & 0xff;
}
}
else {
for (j=0; j < wordcount; j++)
((unsigned short*)buf)[j] = SWAB16(ATA_DATA);
}
/*
"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(!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;
if (start == 0)
panicf("Writing on sector 0\n");
mutex_lock(&ata_mtx);
last_disk_activity = current_tick;
if ( sleeping ) {
spinup = true;
if (poweroff) {
if (ata_power_on()) {
mutex_unlock(&ata_mtx);
return -1;
}
}
else {
if (perform_soft_reset()) {
mutex_unlock(&ata_mtx);
return -1;
}
}
}
ATA_SELECT = ata_device;
if (!wait_for_rdy())
{
mutex_unlock(&ata_mtx);
return -2;
}
led(true);
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())
{
mutex_unlock(&ata_mtx);
return 0;
}
if (spinup) {
ata_spinup_time = current_tick - last_disk_activity;
spinup = false;
sleeping = false;
poweroff = false;
}
for (j=0; j<SECTOR_SIZE/2; j++)
ATA_DATA = SWAB16(((unsigned short*)buf)[j]);
#ifdef USE_INTERRUPT
/* reading the status register clears the interrupt */
j = ATA_STATUS;
#endif
buf += SECTOR_SIZE;
last_disk_activity = current_tick;
}
if(!wait_for_end_of_transfer())
ret = -3;
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_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 ) {
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;
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 */
PADR &= ~0x0200; /* assert _RESET */
sleep(1); /* > 25us */
/* state HRR1 */
PADR |= 0x0200; /* 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(HZ/20000); /* >= 5us */
ATA_CONTROL = CONTROL_nIEN;
sleep(HZ/400); /* >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 ) {
ata_device = 0;
DEBUGF("Found master harddisk\n");
}
else {
/* slave? */
ATA_SELECT = SELECT_DEVICE1;
if ( ATA_STATUS & STATUS_RDY ) {
ata_device = SELECT_DEVICE1;
DEBUGF("Found slave harddisk\n");
}
else
return -1;
}
return 0;
}
static int io_address_detect(void)
{
unsigned char tmp = ATA_STATUS & 0xf9; /* Mask the IDX and CORR bits */
unsigned char dummy;
/* We compare the STATUS register with the ALT_STATUS register, which
is located at the same address as CONTROL. If they are the same, we
assume that we have the correct address.
We can't read the ATA_STATUS directly, since the read data will stay
on the data bus if the following read does not assert the Chip Select
to the ATA controller. We read a register that we know exists to make
sure that the data on the bus isn't identical to the STATUS register
contents. */
ATA_SECTOR = 0;
dummy = ATA_SECTOR;
if(tmp == ((*ATA_CONTROL2) & 0xf9))
{
DEBUGF("CONTROL is at 0x306\n");
ata_io_address = 0x300; /* For debug purposes only */
old_recorder = true;
ata_control = ATA_CONTROL2;
}
else
{
DEBUGF("CONTROL is at 0x206\n");
ata_io_address = 0x200; /* For debug purposes only */
old_recorder = false;
ata_control = ATA_CONTROL1;
}
/* Let's check again, to be sure */
if(tmp != ATA_CONTROL)
{
DEBUGF("ATA I/O address detection failed\n");
return -1;
}
return 0;
}
void ata_enable(bool on)
{
if(on)
PADR &= ~0x80; /* enable ATA */
else
PADR |= 0x80; /* disable ATA */
PAIOR |= 0x80;
}
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;
}
unsigned short* ata_get_identify(void)
{
return identify_info;
}
int ata_init(void)
{
mutex_init(&ata_mtx);
led(false);
ata_enable(true);
if ( !initialized ) {
if (master_slave_detect())
return -1;
if (io_address_detect())
return -2;
if (check_registers())
return -3;
if (freeze_lock())
return -4;
if (identify())
return -5;
multisectors = identify_info[47] & 0xff;
DEBUGF("ata: %d sectors per ata request\n",multisectors);
queue_init(&ata_queue);
create_thread(ata_thread, ata_stack,
sizeof(ata_stack), ata_thread_name);
initialized = true;
}
if (set_multiple_mode(multisectors))
return -6;
return 0;
}
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