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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id:$
*
* Copyright (C) 2010 Marcin Bukat
*
* 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 <stdbool.h>
#include "cpu.h"
#include "system.h"
#include "kernel.h"
#include "usb.h"
void usb_init_device(void)
{
/* GPIO42 is USB detect input
* but it also serves as MCLK2 for DAC
*/
and_l(~(1<<4), &GPIO1_OUT); /* GPIO36 low */
or_l((1<<4), &GPIO1_ENABLE); /* GPIO36 */
or_l((1<<4)|(1<<5), &GPIO1_FUNCTION); /* GPIO36 GPIO37 */
/* GPIO22 GPIO30 high */
or_l((1<<22)|(1<<30), &GPIO_OUT);
or_l((1<<22)|(1<<30), &GPIO_ENABLE);
or_l((1<<22)|(1<<30), &GPIO_FUNCTION);
}
int usb_detect(void)
{
/* GPIO42 active low*/
return (GPIO1_READ & (1<<10)) ? USB_EXTRACTED : USB_INSERTED;
}
void usb_enable(bool on)
{
if(on)
{
and_l(~(1<<30),&GPIO_OUT); /* GPIO30 low */
/* GPIO36 low delay GPIO36 high delay */
and_l(~(1<<4),&GPIO1_OUT);
or_l((1<<4),&GPIO1_OUT);
sleep(HZ/5); /* delay 200 ms */
and_l(~(1<<22),&GPIO_OUT); /* GPIO22 low */
}
else
{
/* GPIO36 low delay GPIO36 high delay */
and_l(~(1<<4),&GPIO1_OUT);
sleep(HZ/100);
or_l((1<<4),&GPIO1_OUT);
sleep(HZ/100);
or_l((1<<22),&GPIO_OUT); /* GPIO22 high */
or_l((1<<30),&GPIO_OUT); /* GPIO30 high */
and_l(~(1<<4),&GPIO1_OUT); /* GPIO36 low */
while ( !(GPIO1_READ & (1<<5)) ) {}
sleep(HZ);
}
}
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