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rockbox/firmware/usb.c
Linus Nielsen Feltzing 01530ac5c8 Proper USB detection for iRiver 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@5377 a1c6a512-1295-4272-9138-f99709370657
2004-11-02 22:57:51 +00:00

453 lines
11 KiB
C
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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2002 by Linus Nielsen Feltzing
*
* 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 "config.h"
#include "cpu.h"
#include "kernel.h"
#include "thread.h"
#include "system.h"
#include "debug.h"
#include "ata.h"
#include "fat.h"
#include "disk.h"
#include "panic.h"
#include "lcd.h"
#include "adc.h"
#include "usb.h"
#include "button.h"
#include "sprintf.h"
#include "hwcompat.h"
#ifdef HAVE_MMC
#include "ata_mmc.h"
#endif
extern void dbg_ports(void); /* NASTY! defined in apps/ */
#ifdef HAVE_LCD_BITMAP
bool do_screendump_instead_of_usb = false;
void screen_dump(void); /* Nasty again. Defined in apps/ too */
#endif
#define USB_REALLY_BRAVE
#if !defined(SIMULATOR) && !defined(USB_NONE)
/* Messages from usb_tick */
#define USB_INSERTED 1
#define USB_EXTRACTED 2
#ifdef HAVE_MMC
#define USB_REENABLE 3
#endif
/* Thread states */
#define EXTRACTING 1
#define EXTRACTED 2
#define INSERTED 3
#define INSERTING 4
/* The ADC tick reads one channel per tick, and we want to check 3 successive
readings on the USB voltage channel. This doesn't apply to the Player, but
debouncing the USB detection port won't hurt us either. */
#define NUM_POLL_READINGS (NUM_ADC_CHANNELS * 3)
static int countdown;
static int usb_state;
#ifdef HAVE_MMC
static int usb_mmc_countdown = 0;
#endif
/* FIXME: The extra 0x400 is consumed by fat_mount() when the fsinfo
needs updating */
static char usb_stack[DEFAULT_STACK_SIZE + 0x400];
static const char usb_thread_name[] = "usb";
static struct event_queue usb_queue;
static bool last_usb_status;
static bool usb_monitor_enabled;
static void usb_enable(bool on)
{
#ifdef USB_ENABLE_ONDIOSTYLE
PACR2 &= ~0x04C0; /* use PA3, PA5 as GPIO */
if(on)
{
#ifdef HAVE_MMC
mmc_select_clock(mmc_detect() ? 1 : 0);
#endif
or_b(0x20, &PADRL); /* enable USB */
and_b(~0x08, &PADRL); /* assert card detect */
}
else
{
and_b(~0x20, &PADRL); /* disable USB */
or_b(0x08, &PADRL); /* deassert card detect */
}
or_b(0x28, &PAIORL); /* output for USB enable and card detect */
#else /* standard HD Jukebox */
#ifdef HAVE_LCD_BITMAP
if(read_hw_mask() & USB_ACTIVE_HIGH)
on = !on;
#endif
if(on)
{
and_b(~0x04, &PADRH); /* enable USB */
}
else
{
or_b(0x04, &PADRH);
}
or_b(0x04, &PAIORH);
#endif
}
static void usb_slave_mode(bool on)
{
int rc;
struct partinfo* pinfo;
if(on)
{
DEBUGF("Entering USB slave mode\n");
ata_soft_reset();
ata_init();
ata_standby(15);
ata_enable(false);
usb_enable(true);
}
else
{
int i;
DEBUGF("Leaving USB slave mode\n");
/* Let the ISDx00 settle */
sleep(HZ*1);
usb_enable(false);
rc = ata_init();
if(rc)
{
char str[32];
lcd_clear_display();
snprintf(str, 31, "ATA error: %d", rc);
lcd_puts(0, 0, str);
lcd_puts(0, 1, "Press ON to debug");
lcd_update();
while(!(button_get(true) & BUTTON_REL)) {};
dbg_ports();
panicf("ata: %d",rc);
}
pinfo = disk_init();
if (!pinfo)
panicf("disk: NULL");
for ( i=0; i<4; i++ ) {
rc = fat_mount(pinfo[i].start);
if (!rc)
break;
}
if (i==4)
panicf("mount: %d",rc);
}
}
static void usb_thread(void)
{
int num_acks_to_expect = -1;
bool waiting_for_ack;
struct event ev;
waiting_for_ack = false;
while(1)
{
queue_wait(&usb_queue, &ev);
switch(ev.id)
{
case USB_INSERTED:
#ifdef HAVE_LCD_BITMAP
if(do_screendump_instead_of_usb)
{
screen_dump();
}
else
{
#endif
/* Tell all threads that they have to back off the ATA.
We subtract one for our own thread. */
num_acks_to_expect =
queue_broadcast(SYS_USB_CONNECTED, NULL) - 1;
waiting_for_ack = true;
DEBUGF("USB inserted. Waiting for ack from %d threads...\n",
num_acks_to_expect);
#ifdef HAVE_LCD_BITMAP
}
#endif
break;
case SYS_USB_CONNECTED_ACK:
if(waiting_for_ack)
{
num_acks_to_expect--;
if(num_acks_to_expect == 0)
{
DEBUGF("All threads have acknowledged the connect.\n");
#ifdef USB_REALLY_BRAVE
usb_slave_mode(true);
usb_state = USB_INSERTED;
#else
system_reboot();
#endif
}
else
{
DEBUGF("usb: got ack, %d to go...\n",
num_acks_to_expect);
}
}
break;
case USB_EXTRACTED:
#ifdef HAVE_LCD_BITMAP
if(!do_screendump_instead_of_usb)
{
#endif
if(usb_state == USB_INSERTED)
{
/* Only disable the USB mode if we really have enabled it
some threads might not have acknowledged the
insertion */
usb_slave_mode(false);
}
usb_state = USB_EXTRACTED;
/* Tell all threads that we are back in business */
num_acks_to_expect =
queue_broadcast(SYS_USB_DISCONNECTED, NULL) - 1;
waiting_for_ack = true;
DEBUGF("USB extracted. Waiting for ack from %d threads...\n",
num_acks_to_expect);
#ifdef HAVE_LCD_CHARCELLS
lcd_icon(ICON_USB, false);
#endif
#ifdef HAVE_LCD_BITMAP
}
#endif
break;
case SYS_USB_DISCONNECTED_ACK:
if(waiting_for_ack)
{
num_acks_to_expect--;
if(num_acks_to_expect == 0)
{
DEBUGF("All threads have acknowledged. "
"We're in business.\n");
}
else
{
DEBUGF("usb: got ack, %d to go...\n",
num_acks_to_expect);
}
}
break;
#ifdef HAVE_MMC
case SYS_MMC_INSERTED:
case SYS_MMC_EXTRACTED:
if(usb_state == USB_INSERTED)
{
usb_enable(false);
usb_mmc_countdown = HZ/2; /* re-enable after 0.5 sec */
}
break;
case USB_REENABLE:
if(usb_state == USB_INSERTED)
usb_enable(true); /* reenable only if still inserted */
break;
#endif
}
}
}
bool usb_detect(void)
{
bool current_status;
#ifdef USB_RECORDERSTYLE
current_status = (adc_read(ADC_USB_POWER) > 500)?true:false;
#endif
#ifdef USB_FMRECORDERSTYLE
current_status = (adc_read(ADC_USB_POWER) <= 512)?true:false;
#endif
#ifdef USB_PLAYERSTYLE
current_status = (PADR & 0x8000)?false:true;
#endif
#ifdef IRIVER_H100
current_status = (GPIO1_READ & 0x80)?true:false;
#endif
return current_status;
}
static void usb_tick(void)
{
bool current_status;
if(usb_monitor_enabled)
{
current_status = usb_detect();
/* Only report when the status has changed */
if(current_status != last_usb_status)
{
last_usb_status = current_status;
countdown = NUM_POLL_READINGS;
}
else
{
/* Count down until it gets negative */
if(countdown >= 0)
countdown--;
/* Report to the thread if we have had 3 identical status
readings in a row */
if(countdown == 0)
{
if(current_status)
queue_post(&usb_queue, USB_INSERTED, NULL);
else
queue_post(&usb_queue, USB_EXTRACTED, NULL);
}
}
}
#ifdef HAVE_MMC
if(usb_mmc_countdown > 0)
{
usb_mmc_countdown--;
if (usb_mmc_countdown == 0)
queue_post(&usb_queue, USB_REENABLE, NULL);
}
#endif
}
void usb_acknowledge(int id)
{
queue_post(&usb_queue, id, NULL);
}
void usb_init(void)
{
usb_state = USB_EXTRACTED;
usb_monitor_enabled = false;
countdown = -1;
#ifdef IRIVER_H100
GPIO1_FUNCTION |= 0x80; /* GPIO39 is the USB detect input */
#endif
usb_enable(false);
/* We assume that the USB cable is extracted */
last_usb_status = false;
queue_init(&usb_queue);
create_thread(usb_thread, usb_stack, sizeof(usb_stack), usb_thread_name);
tick_add_task(usb_tick);
}
void usb_wait_for_disconnect(struct event_queue *q)
{
struct event ev;
/* Don't return until we get SYS_USB_DISCONNECTED */
while(1)
{
queue_wait(q, &ev);
if(ev.id == SYS_USB_DISCONNECTED)
{
usb_acknowledge(SYS_USB_DISCONNECTED_ACK);
return;
}
}
}
int usb_wait_for_disconnect_w_tmo(struct event_queue *q, int ticks)
{
struct event ev;
/* Don't return until we get SYS_USB_DISCONNECTED or SYS_TIMEOUT */
while(1)
{
queue_wait_w_tmo(q, &ev, ticks);
switch(ev.id)
{
case SYS_USB_DISCONNECTED:
usb_acknowledge(SYS_USB_DISCONNECTED_ACK);
return 0;
break;
case SYS_TIMEOUT:
return 1;
break;
}
}
}
void usb_start_monitoring(void)
{
usb_monitor_enabled = true;
}
bool usb_inserted(void)
{
return usb_state == USB_INSERTED;
}
#else
#ifdef USB_NONE
bool usb_inserted(void)
{
return false;
}
#endif
/* Dummy simulator functions */
void usb_acknowledge(int id)
{
id = id;
}
void usb_init(void)
{
}
void usb_start_monitoring(void)
{
}
bool usb_detect(void)
{
return false;
}
#endif /* USB_NONE or SIMULATOR */
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