firmware/target/arm/usb-fw-pp502x.c

/***************************************************************************
 *             __________               __   ___.
 *   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
 *
 * 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 "system.h"
#include "usb.h"
#include "button.h"
#include "ata.h"
#include "string.h"
#include "arcotg_udc.h"

#ifdef HAVE_USBSTACK
#include "usbstack.h"
#endif

void usb_init_device(void)
{
    int r0;
    GPO32_ENABLE |= 0x200;  

    outl(inl(0x7000002C) | 0x3000000, 0x7000002C);  
    DEV_EN |= DEV_USB;

    DEV_RS |= DEV_USB; /* reset usb start */  
    DEV_RS &=~DEV_USB;/* reset usb end */  

    DEV_INIT2 |= INIT_USB;
    while ((inl(0x70000028) & 0x80) == 0);

    UDC_PORTSC1 |= PORTSCX_PORT_RESET;  
    while ((UDC_PORTSC1 & PORTSCX_PORT_RESET) != 0);

    UDC_OTGSC |= 0x5F000000;
    if( (UDC_OTGSC & 0x100) == 0) {  
        UDC_USBMODE &=~ USB_MODE_CTRL_MODE_HOST;
        UDC_USBMODE |= USB_MODE_CTRL_MODE_DEVICE;
        outl(inl(0x70000028) | 0x4000, 0x70000028);
        outl(inl(0x70000028) | 0x2, 0x70000028);
    } else {
        UDC_USBMODE |= USB_MODE_CTRL_MODE_DEVICE;
        outl(inl(0x70000028) &~0x4000, 0x70000028);
        outl(inl(0x70000028) | 0x2, 0x70000028);
    }


    UDC_USBCMD |= USB_CMD_CTRL_RESET;
    while((UDC_USBCMD & USB_CMD_CTRL_RESET) != 0);

    r0 = UDC_PORTSC1;

    /* Note from IPL source (referring to next 5 lines of code:  
       THIS NEEDS TO BE CHANGED ONCE THERE IS KERNEL USB */  
    DEV_INIT2 |= INIT_USB;
    DEV_EN |= DEV_USB;
    while ((inl(0x70000028) & 0x80) == 0);
    outl(inl(0x70000028) | 0x2, 0x70000028);

    udelay(0x186A0);

#ifndef HAVE_USBSTACK
    dr_controller_setup();
#endif

#if defined(IPOD_COLOR) || defined(IPOD_4G) \
 || defined(IPOD_MINI)  || defined(IPOD_MINI2G)
    /* GPIO C bit 1 is firewire detect */
    GPIOC_ENABLE    |=  0x02;
    GPIOC_OUTPUT_EN &= ~0x02;
#endif
}

void usb_enable(bool on)
{
#ifdef HAVE_USBSTACK
    if (!on) {
        usb_stack_stop();
    }
#else
    /* This device specific code will eventually give way to proper USB
       handling, which should be the same for all PP502x targets. */
    if (on)
    {
#if defined(IPOD_ARCH) || defined(IRIVER_H10) || defined (IRIVER_H10_5GB) ||\
    defined(SANSA_C200)
        /* For the H10 and iPod, we can only do one thing with USB mode - reboot
           into the flash-based disk-mode.  This does not return. */

#if defined(IRIVER_H10) || defined (IRIVER_H10_5GB)
        if(button_status()==BUTTON_RIGHT)
#endif /* defined(IRIVER_H10) || defined (IRIVER_H10_5GB) */
        {
#ifndef HAVE_FLASH_STORAGE
            ata_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 /*defined(IPOD_ARCH) || defined(IRIVER_H10) || defined (IRIVER_H10_5GB)*/
    }
#endif /* !HAVE_USBSTACK */
}

int usb_detect(void)
{
    static int countdown = 0;
    static int status = USB_EXTRACTED;
    static bool prev_usbstatus1 = false;
    bool usbstatus1, usbstatus2;

#if defined(IPOD_COLOR) || defined(IPOD_4G) \
 || defined(IPOD_MINI)  || defined(IPOD_MINI2G)
    /* GPIO C bit 1 is firewire detect */
    if (!(GPIOC_INPUT_VAL & 0x02))
        return USB_INSERTED;
#endif

    if (countdown > 0)
    {
        countdown--;

        usbstatus2 = (UDC_PORTSC1 & PORTSCX_CURRENT_CONNECT_STATUS) ? true : false;
        if ((countdown == 0) || usbstatus2)
        {
            countdown = 0;
            status = usbstatus2 ? USB_INSERTED : USB_POWERED;
#ifndef HAVE_USBSTACK
            dr_controller_stop();
#endif
        }
        return status;
    }

    /* UDC_ID should have the bit format:
        [31:24] = 0x0
        [23:16] = 0x22 (Revision number)
        [15:14] = 0x3 (Reserved)
        [13:8]  = 0x3a (NID - 1's compliment of ID)
        [7:6]   = 0x0 (Reserved)
        [5:0]   = 0x05 (ID) */
    if (UDC_ID != 0x22FA05) {
        /* This should never occur - do we even need to test? */
        return USB_EXTRACTED;
    }

    usbstatus1 = (UDC_OTGSC & 0x800) ? true : false;

    if (usbstatus1 == prev_usbstatus1)
    {
        /* Nothing has changed, so just return previous status */
        return status;
    }
    prev_usbstatus1 = usbstatus1;

    if (!usbstatus1)
    {   /* We have just been disconnected */
        status = USB_EXTRACTED;
        return status;
    }

    /* We now know that we have just been connected to either a charger
       or a computer */

    if((button_status() & ~USBPOWER_BTN_IGNORE) == USBPOWER_BUTTON)
    {   
        /* The user wants to charge, so it doesn't matter what we are
           connected to. */

        status = USB_POWERED;
        return status;
    }

    /* Run the USB controller for long enough to detect if we're connected
       to a computer, then stop it again. */

#ifndef HAVE_USBSTACK
    dr_controller_run();
#else
    usb_stack_start();
#endif

    /* Wait for 50 ticks (500ms) before deciding there is no computer
       attached.  The required value varied a lot between different users
       when this feature was being tested. */

    countdown = 50;

    return status;
}