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rockbox/firmware/usb.c

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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2002 by Linus Nielsen Feltzing
*
* iPod driver based on code from the ipodlinux project - http://ipodlinux.org
* Adapted for Rockbox in January 2006
* Original file: podzilla/usb.c
* Copyright (C) 2005 Adam Johnston
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* 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 "storage.h"
#include "fat.h"
#include "disk.h"
#include "panic.h"
#include "lcd.h"
#include "usb-target.h"
#include "usb.h"
#include "button.h"
#include "sprintf.h"
#include "string.h"
#ifdef HAVE_USBSTACK
#include "usb_core.h"
#endif
#include "logf.h"
/* Conditions under which we want the entire driver */
#if !defined(BOOTLOADER) || (CONFIG_CPU == SH7034) || \
(defined(TOSHIBA_GIGABEAT_S) && defined(USE_ROCKBOX_USB) && defined(USB_STORAGE)) || \
(defined(HAVE_USBSTACK) && (defined(CREATIVE_ZVx) || \
defined(CPU_TCC77X) || defined(CPU_TCC780X))) || \
(CONFIG_USBOTG == USBOTG_JZ4740)
#define USB_FULL_INIT
#endif
#ifdef HAVE_LCD_BITMAP
bool do_screendump_instead_of_usb = false;
#if defined(USB_FULL_INIT) && defined(BOOTLOADER)
static void screen_dump(void) {}
#else
void screen_dump(void); /* Nasty again. Defined in apps/ too */
#endif
#endif
#if !defined(SIMULATOR) && !defined(USB_NONE)
static int usb_state;
#if (CONFIG_STORAGE & STORAGE_MMC) && defined(USB_FULL_INIT)
static int usb_mmc_countdown = 0;
#endif
/* FIXME: The extra 0x800 is consumed by fat_mount() when the fsinfo
needs updating */
#ifdef USB_FULL_INIT
static long usb_stack[(DEFAULT_STACK_SIZE + 0x800)/sizeof(long)];
static const char usb_thread_name[] = "usb";
static unsigned int usb_thread_entry = 0;
#ifndef USB_STATUS_BY_EVENT
#define NUM_POLL_READINGS (HZ/5)
static int countdown;
#endif /* USB_STATUS_BY_EVENT */
#endif /* USB_FULL_INIT */
static struct event_queue usb_queue;
static bool usb_monitor_enabled;
static int last_usb_status;
#ifdef HAVE_USBSTACK
static bool exclusive_storage_access;
#endif
#ifdef USB_FIREWIRE_HANDLING
static int firewire_countdown;
static bool last_firewire_status;
#endif
#ifdef USB_FULL_INIT
#if defined(USB_FIREWIRE_HANDLING) \
|| (defined(HAVE_USBSTACK) && !defined(USE_ROCKBOX_USB))
static void try_reboot(void)
{
#ifdef HAVE_DISK_STORAGE
storage_sleepnow(); /* Immediately spindown the disk. */
sleep(HZ*2);
#endif
#ifdef IPOD_ARCH /* The following code is based on ipodlinux */
#if CONFIG_CPU == PP5020
memcpy((void *)0x40017f00, "diskmode\0\0hotstuff\0\0\1", 21);
#elif CONFIG_CPU == PP5022
memcpy((void *)0x4001ff00, "diskmode\0\0hotstuff\0\0\1", 21);
#endif /* CONFIG_CPU */
#endif /* IPOD_ARCH */
system_reboot(); /* Reboot */
}
#endif /* USB_FIRWIRE_HANDLING || (HAVE_USBSTACK && !USE_ROCKBOX_USB) */
#ifdef HAVE_USBSTACK
/* inline since branch is chosen at compile time */
static inline void usb_slave_mode(bool on)
{
#ifdef USE_ROCKBOX_USB
int rc;
if (on)
{
trigger_cpu_boost();
#ifdef HAVE_PRIORITY_SCHEDULING
thread_set_priority(THREAD_ID_CURRENT, PRIORITY_REALTIME);
#endif
usb_attach();
}
else /* usb_state == USB_INSERTED (only!) */
{
#ifndef USB_DETECT_BY_DRV
usb_enable(false);
#endif
#ifdef HAVE_PRIORITY_SCHEDULING
thread_set_priority(THREAD_ID_CURRENT, PRIORITY_SYSTEM);
#endif
/* Entered exclusive mode */
rc = disk_mount_all();
if (rc <= 0) /* no partition */
panicf("mount: %d",rc);
cancel_cpu_boost();
}
#else /* !USB_ROCKBOX_USB */
if (on)
{
/* until we have native mass-storage mode, we want to reboot on
usb host connect */
try_reboot();
}
#endif /* USE_ROCKBOX_USB */
}
void usb_signal_transfer_completion(
struct usb_transfer_completion_event_data* event_data)
{
queue_post(&usb_queue, USB_TRANSFER_COMPLETION, (intptr_t)event_data);
}
#else /* !HAVE_USBSTACK */
/* inline since branch is chosen at compile time */
static inline void usb_slave_mode(bool on)
{
int rc;
if(on)
{
DEBUGF("Entering USB slave mode\n");
storage_soft_reset();
storage_init();
storage_enable(false);
usb_enable(true);
cpu_idle_mode(true);
}
else
{
DEBUGF("Leaving USB slave mode\n");
cpu_idle_mode(false);
/* Let the ISDx00 settle */
sleep(HZ*1);
usb_enable(false);
rc = storage_init();
if(rc)
panicf("storage: %d",rc);
rc = disk_mount_all();
if (rc <= 0) /* no partition */
panicf("mount: %d",rc);
}
}
#endif /* HAVE_USBSTACK */
#ifdef HAVE_USB_POWER
static inline bool usb_power_button(void)
{
#if defined(IRIVER_H10) || defined (IRIVER_H10_5GB)
return (button_status() & ~USBPOWER_BTN_IGNORE) != USBPOWER_BUTTON;
#else
return (button_status() & ~USBPOWER_BTN_IGNORE) == USBPOWER_BUTTON;
#endif
}
#ifdef USB_FIREWIRE_HANDLING
static inline bool usb_reboot_button(void)
{
return (button_status() & ~USBPOWER_BTN_IGNORE) != USBPOWER_BUTTON;
}
#endif
#endif /* HAVE_USB_POWER */
static void usb_thread(void)
{
int num_acks_to_expect = 0;
struct queue_event ev;
while(1)
{
queue_wait(&usb_queue, &ev);
switch(ev.id)
{
#ifdef USB_DRIVER_CLOSE
case USB_QUIT:
return;
#endif
#ifdef HAVE_USBSTACK
case USB_TRANSFER_COMPLETION:
usb_core_handle_transfer_completion(
(struct usb_transfer_completion_event_data*)ev.data);
break;
#endif
#ifdef USB_DETECT_BY_DRV
/* In this case, these events the handle cable insertion USB
* driver determines INSERTED/EXTRACTED state. */
case USB_POWERED:
/* Set the state to USB_POWERED for now and enable the driver
* to detect a bus reset only. If a bus reset is detected,
* USB_INSERTED will be received. */
usb_state = USB_POWERED;
usb_enable(true);
break;
case USB_UNPOWERED:
usb_enable(false);
/* This part shouldn't be obligatory for anything that can
* reliably detect removal of the data lines. USB_EXTRACTED
* could be posted on that event while bus power remains
* available. */
queue_post(&usb_queue, USB_EXTRACTED, 0);
break;
#endif /* USB_DETECT_BY_DRV */
case USB_INSERTED:
#ifdef HAVE_LCD_BITMAP
if(do_screendump_instead_of_usb)
{
usb_state = USB_SCREENDUMP;
screen_dump();
break;
}
#endif
#ifdef HAVE_USB_POWER
if(usb_power_button())
{
/* Only charging is desired */
usb_state = USB_POWERED;
#ifdef HAVE_USBSTACK
usb_core_enable_driver(USB_DRIVER_MASS_STORAGE, false);
usb_core_enable_driver(USB_DRIVER_CHARGING_ONLY, true);
usb_attach();
#endif
break;
}
#endif /* HAVE_USB_POWER */
#ifdef HAVE_USBSTACK
#ifdef HAVE_USB_POWER
/* Set the state to USB_POWERED for now. If permission to connect
* by threads and storage is granted it will be changed to
* USB_CONNECTED. */
usb_state = USB_POWERED;
#endif
usb_core_enable_driver(USB_DRIVER_MASS_STORAGE, true);
usb_core_enable_driver(USB_DRIVER_CHARGING_ONLY, false);
/* Check any drivers enabled at this point for exclusive storage
* access requirements. */
exclusive_storage_access = usb_core_any_exclusive_storage();
if(!exclusive_storage_access)
{
usb_attach();
break;
}
#endif /* HAVE_USBSTACK */
/* Tell all threads that they have to back off the storage.
We subtract one for our own thread. */
num_acks_to_expect = queue_broadcast(SYS_USB_CONNECTED, 0) - 1;
DEBUGF("USB inserted. Waiting for ack from %d threads...\n",
num_acks_for_connect);
break;
case SYS_USB_CONNECTED_ACK:
if(num_acks_to_expect > 0 && --num_acks_to_expect == 0)
{
DEBUGF("All threads have acknowledged the connect.\n");
usb_slave_mode(true);
usb_state = USB_INSERTED;
}
else
{
DEBUGF("usb: got ack, %d to go...\n",
num_acks_to_expect);
}
break;
case USB_EXTRACTED:
#ifdef HAVE_LCD_BITMAP
if(usb_state == USB_SCREENDUMP)
{
usb_state = USB_EXTRACTED;
break; /* Connected for screendump only */
}
#endif
#ifndef HAVE_USBSTACK /* Stack must undo this if POWERED state was transitional */
#ifdef HAVE_USB_POWER
if(usb_state == USB_POWERED)
{
usb_state = USB_EXTRACTED;
break;
}
#endif
#endif /* HAVE_USBSTACK */
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;
#ifdef HAVE_USBSTACK
if(!exclusive_storage_access)
{
#ifndef USB_DETECT_BY_DRV /* Disabled handling USB_UNPOWERED */
usb_enable(false);
#endif
break;
}
exclusive_storage_access = false;
#endif /* HAVE_USBSTACK */
/* Tell all threads that we are back in business */
num_acks_to_expect =
queue_broadcast(SYS_USB_DISCONNECTED, 0) - 1;
DEBUGF("USB extracted. Waiting for ack from %d threads...\n",
num_acks_to_expect);
break;
case SYS_USB_DISCONNECTED_ACK:
if(num_acks_to_expect > 0 && --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_HOTSWAP
case SYS_HOTSWAP_INSERTED:
case SYS_HOTSWAP_EXTRACTED:
#ifdef HAVE_USBSTACK
usb_core_hotswap_event(1,ev.id == SYS_HOTSWAP_INSERTED);
#else /* !HAVE_USBSTACK */
if(usb_state == USB_INSERTED)
{
usb_enable(false);
#if (CONFIG_STORAGE & STORAGE_MMC)
usb_mmc_countdown = HZ/2; /* re-enable after 0.5 sec */
#endif /* STORAGE_MMC */
}
#endif /* HAVE_USBSTACK */
break;
#if (CONFIG_STORAGE & STORAGE_MMC)
case USB_REENABLE:
if(usb_state == USB_INSERTED)
usb_enable(true); /* reenable only if still inserted */
break;
#endif /* STORAGE_MMC */
#endif /* HAVE_HOTSWAP */
#ifdef USB_FIREWIRE_HANDLING
case USB_REQUEST_REBOOT:
#ifdef HAVE_USB_POWER
if (usb_reboot_button())
#endif
try_reboot();
break;
#endif /* USB_FIREWIRE_HANDLING */
}
}
}
#ifdef USB_STATUS_BY_EVENT
void usb_status_event(int current_status)
{
/* Status should be USB_POWERED, USB_UNPOWERED, USB_INSERTED or
* USB_EXTRACTED.
* Caller isn't expected to filter for changes in status. */
if(usb_monitor_enabled)
{
int oldstatus = disable_irq_save(); /* Dual-use function */
if(last_usb_status != current_status)
{
last_usb_status = current_status;
queue_post(&usb_queue, current_status, 0);
}
restore_irq(oldstatus);
}
}
void usb_start_monitoring(void)
{
int status = usb_detect();
#ifdef USB_DETECT_BY_DRV
/* USB detection begins by USB_POWERED, not USB_INSERTED. If it is
* USB_EXTRACTED, then nothing changes and post will be skipped. */
if(USB_INSERTED == status)
status = USB_POWERED;
#endif
usb_monitor_enabled = true;
usb_status_event(status);
}
#else /* !USB_STATUS_BY_EVENT */
static void usb_tick(void)
{
int current_status;
if(usb_monitor_enabled)
{
#ifdef USB_FIREWIRE_HANDLING
int current_firewire_status = firewire_detect();
if(current_firewire_status != last_firewire_status)
{
last_firewire_status = current_firewire_status;
firewire_countdown = NUM_POLL_READINGS;
}
else
{
/* Count down until it gets negative */
if(firewire_countdown >= 0)
firewire_countdown--;
/* Report to the thread if we have had 3 identical status
readings in a row */
if(firewire_countdown == 0)
{
queue_post(&usb_queue, USB_REQUEST_REBOOT, 0);
}
}
#endif /* USB_FIREWIRE_HANDLING */
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)
{
queue_post(&usb_queue, current_status, 0);
}
}
}
#if (CONFIG_STORAGE & STORAGE_MMC)
if(usb_mmc_countdown > 0)
{
usb_mmc_countdown--;
if (usb_mmc_countdown == 0)
queue_post(&usb_queue, USB_REENABLE, 0);
}
#endif
}
void usb_start_monitoring(void)
{
usb_monitor_enabled = true;
}
#endif /* USB_STATUS_BY_EVENT */
#endif /* USB_FULL_INIT */
void usb_acknowledge(long id)
{
queue_post(&usb_queue, id, 0);
}
void usb_init(void)
{
/* We assume that the USB cable is extracted */
usb_state = USB_EXTRACTED;
last_usb_status = USB_EXTRACTED;
usb_monitor_enabled = false;
#ifdef HAVE_USBSTACK
exclusive_storage_access = false;
#endif
#ifdef USB_FIREWIRE_HANDLING
firewire_countdown = -1;
last_firewire_status = false;
#endif
usb_init_device();
#ifdef USB_FULL_INIT
usb_enable(false);
queue_init(&usb_queue, true);
usb_thread_entry = create_thread(usb_thread, usb_stack,
sizeof(usb_stack), 0, usb_thread_name
IF_PRIO(, PRIORITY_SYSTEM) IF_COP(, CPU));
#ifndef USB_STATUS_BY_EVENT
countdown = -1;
tick_add_task(usb_tick);
#endif
#endif /* USB_FULL_INIT */
}
void usb_wait_for_disconnect(struct event_queue *q)
{
#ifdef USB_FULL_INIT
struct queue_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;
}
}
#else
(void)q;
#endif /* USB_FULL_INIT */
}
int usb_wait_for_disconnect_w_tmo(struct event_queue *q, int ticks)
{
#ifdef USB_FULL_INIT
struct queue_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;
case SYS_TIMEOUT:
return 1;
}
}
#else
(void)q; (void)ticks;
return 0;
#endif /* USB_FULL_INIT */
}
#ifdef USB_DRIVER_CLOSE
void usb_close(void)
{
unsigned int thread = usb_thread_entry;
usb_thread_entry = 0;
if (thread == 0)
return;
#ifndef USB_STATUS_BY_EVENT
tick_remove_task(usb_tick);
#endif
usb_monitor_enabled = false;
queue_post(&usb_queue, USB_QUIT, 0);
thread_wait(thread);
}
#endif /* USB_DRIVER_CLOSE */
bool usb_inserted(void)
{
#ifdef HAVE_USB_POWER
return usb_state == USB_INSERTED || usb_state == USB_POWERED;
#else
return usb_state == USB_INSERTED;
#endif
}
#ifdef HAVE_USBSTACK
bool usb_exclusive_storage(void)
{
return exclusive_storage_access;
}
#endif
#ifdef HAVE_USB_POWER
bool usb_powered(void)
{
return usb_state == USB_POWERED;
}
#endif
#else
#ifdef USB_NONE
bool usb_inserted(void)
{
return false;
}
#endif
/* Dummy simulator functions */
void usb_acknowledge(long id)
{
id = id;
}
void usb_init(void)
{
}
void usb_start_monitoring(void)
{
}
int usb_detect(void)
{
return USB_EXTRACTED;
}
void usb_wait_for_disconnect(struct event_queue *q)
{
(void)q;
}
#endif /* USB_NONE or SIMULATOR */
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