Initial commit of work for port to the Tatung Elio TPJ-1022 - yet another PortalPlayer PP5020 target.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@10828 a1c6a512-1295-4272-9138-f99709370657

10 files changed, 654 insertions, 0 deletions

diff --git a/firmware/target/arm/tatung/tpj1022/adc-target.h b/firmware/target/arm/tatung/tpj1022/adc-target.h
new file mode 100644
index 0000000000..3aab373290
--- /dev/null
+++ b/firmware/target/arm/tatung/tpj1022/adc-target.h
@@ -0,0 +1,42 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2006 by Barry Wardell
+ *
+ * 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.
+ *
+ ****************************************************************************/
+#ifndef _ADC_TARGET_H_
+#define _ADC_TARGET_H_
+
+#define ADC_ENABLE_ADDR     (*(volatile unsigned long*)(0x70000010))
+#define ADC_ENABLE          0x1100
+
+#define ADC_ADDR            (*(volatile unsigned long*)(0x7000ad00))
+#define ADC_STATUS          (*(volatile unsigned long*)(0x7000ad04))
+#define ADC_DATA_1          (*(volatile unsigned long*)(0x7000ad20))
+#define ADC_DATA_2          (*(volatile unsigned long*)(0x7000ad24))
+#define ADC_INIT            (*(volatile unsigned long*)(0x7000ad2c))
+
+#define NUM_ADC_CHANNELS 4
+
+#define ADC_BATTERY     0
+#define ADC_UNKNOWN_1   1
+#define ADC_UNKNOWN_2   2
+#define ADC_SCROLLPAD   3
+#define ADC_UNREG_POWER ADC_BATTERY /* For compatibility */
+
+/* Force a scan now */
+unsigned short adc_scan(int channel);
+
+#endif
diff --git a/firmware/target/arm/tatung/tpj1022/adc-tpj1022.c b/firmware/target/arm/tatung/tpj1022/adc-tpj1022.c
new file mode 100644
index 0000000000..134b90b587
--- /dev/null
+++ b/firmware/target/arm/tatung/tpj1022/adc-tpj1022.c
@@ -0,0 +1,101 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2006 by Barry Wardell
+ *
+ * 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 "system.h"
+#include "kernel.h"
+#include "thread.h"
+#include "adc.h"
+
+static unsigned short adcdata[NUM_ADC_CHANNELS];
+
+/* Scan ADC so that adcdata[channel] gets updated */
+unsigned short adc_scan(int channel)
+{
+    unsigned int adc_data_1;
+    unsigned int adc_data_2;
+
+    /* Initialise */
+    ADC_ADDR=0x130;
+    ADC_STATUS=0;   /* 4 bytes, 1 per channel. Each byte is 0 if the channel is
+                       off, 0x40 if the channel is on */
+    
+    /* Enable Channel */
+    ADC_ADDR |= (0x1000000<<channel);
+    
+    /* Start? */
+    ADC_ADDR |= 0x20000000;
+    ADC_ADDR |= 0x80000000;
+    
+    /* ADC_DATA_1 and ADC_DATA_2 are both four bytes, one byte per channel.
+       For each channel, ADC_DATA_1 stores the 8-bit msb, ADC_DATA_2 stores the
+       2-bit lsb (in bits 0 and 1). Each channel is 10 bits total. */
+    adc_data_1 = ((ADC_DATA_1 >> (8*channel)) & 0xff);
+    adc_data_2 = ((ADC_DATA_2 >> (8*channel+6)) & 0x3);
+    
+    adcdata[channel] = (adc_data_1<<2 | adc_data_2);
+    
+    return adcdata[channel];
+}
+
+/* Read 10-bit channel data */
+unsigned short adc_read(int channel)
+{
+    return adcdata[channel];
+}
+
+static int adc_counter;
+
+static void adc_tick(void)
+{
+    if(++adc_counter == HZ)
+    {
+        adc_counter = 0;
+        adc_scan(ADC_BATTERY);
+        adc_scan(ADC_UNKNOWN_1);
+        adc_scan(ADC_UNKNOWN_2);
+        adc_scan(ADC_SCROLLPAD);
+    }
+}
+
+void adc_init(void)
+{
+    /* Enable ADC */
+    ADC_ENABLE_ADDR |= ADC_ENABLE;
+    
+    /* Initialise */
+    ADC_INIT=0;
+    ADC_ADDR=0x130;
+    ADC_STATUS=0;
+    
+    /* Enable Channels 1-4 */
+    ADC_ADDR |= 0x1000000;
+    ADC_ADDR |= 0x2000000;
+    ADC_ADDR |= 0x4000000;
+    ADC_ADDR |= 0x8000000;
+    
+    /* Start? */
+    ADC_ADDR |= 0x20000000;
+    ADC_ADDR |= 0x80000000;
+    
+    /* Wait 50ms for things to settle */
+    sleep(HZ/20);
+    
+    tick_add_task(adc_tick);
+}
diff --git a/firmware/target/arm/tatung/tpj1022/backlight-target.h b/firmware/target/arm/tatung/tpj1022/backlight-target.h
new file mode 100644
index 0000000000..b5fe2f7c5d
--- /dev/null
+++ b/firmware/target/arm/tatung/tpj1022/backlight-target.h
@@ -0,0 +1,28 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2006 by Barry Wardell
+ *
+ * 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.
+ *
+ ****************************************************************************/
+
+/* Taken from the x5's implementation */
+
+#ifndef BACKLIGHT_TARGET_H
+#define BACKLIGHT_TARGET_H
+
+void __backlight_on(void);
+void __backlight_off(void);
+
+#endif
diff --git a/firmware/target/arm/tatung/tpj1022/backlight-tpj1022.c b/firmware/target/arm/tatung/tpj1022/backlight-tpj1022.c
new file mode 100644
index 0000000000..51218e21be
--- /dev/null
+++ b/firmware/target/arm/tatung/tpj1022/backlight-tpj1022.c
@@ -0,0 +1,44 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2006 by Barry Wardell
+ *
+ * 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.
+ *
+ ****************************************************************************/
+
+/* The H10 display (and hence backlight) possibly identical to that of the X5,
+  so that code was used here but left #if 0'ed  out for the moment */
+   
+#include "config.h"
+#include "cpu.h"
+#include "system.h"
+#include "backlight.h"
+
+void __backlight_on(void)
+{
+#if 0    
+    int level = set_irq_level(HIGHEST_IRQ_LEVEL);
+    pcf50606_write(0x38, 0xb0); /* Backlight ON, GPO1INV=1, GPO1ACT=011 */
+    set_irq_level(level);
+#endif
+}
+
+void __backlight_off(void)
+{
+#if 0
+    int level = set_irq_level(HIGHEST_IRQ_LEVEL);
+    pcf50606_write(0x38, 0x80); /* Backlight OFF, GPO1INV=1, GPO1ACT=000 */
+    set_irq_level(level);
+#endif
+}
diff --git a/firmware/target/arm/tatung/tpj1022/button-target.h b/firmware/target/arm/tatung/tpj1022/button-target.h
new file mode 100644
index 0000000000..74bd61ed3d
--- /dev/null
+++ b/firmware/target/arm/tatung/tpj1022/button-target.h
@@ -0,0 +1,58 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2006 by Barry Wardell
+ *
+ * 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.
+ *
+ ****************************************************************************/
+
+#ifndef _BUTTON_TARGET_H_
+#define _BUTTON_TARGET_H_
+
+#include <stdbool.h>
+#include "config.h"
+
+#define HAS_BUTTON_HOLD
+
+bool button_hold(void);
+void button_init_device(void);
+int button_read_device(void);
+
+/* Tatung Elio TPJ-1022 button codes */
+
+/* Main unit's buttons */
+#define BUTTON_POWER        0x00000001
+
+#define BUTTON_LEFT         0x00000002
+#define BUTTON_RIGHT        0x00000004
+#define BUTTON_UP           0x00000008
+#define BUTTON_DOWN         0x00000010
+
+#define BUTTON_MENU         0x00000020
+#define BUTTON_FF           0x00000040
+#define BUTTON_REW          0x00000080
+#define BUTTON_REC          0x00000100
+#define BUTTON_AB           0x00000200
+#define BUTTON_PLUS         0x00000400
+#define BUTTON_MINUS        0x00000800
+
+#define BUTTON_MAIN         0x00000fff
+
+/* No Remote control */
+#define BUTTON_REMOTE 0
+
+#define POWEROFF_BUTTON BUTTON_POWER
+#define POWEROFF_COUNT 10
+
+#endif /* _BUTTON_TARGET_H_ */
diff --git a/firmware/target/arm/tatung/tpj1022/button-tpj1022.c b/firmware/target/arm/tatung/tpj1022/button-tpj1022.c
new file mode 100644
index 0000000000..f0b338c1c1
--- /dev/null
+++ b/firmware/target/arm/tatung/tpj1022/button-tpj1022.c
@@ -0,0 +1,83 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2006 by Barry Wardell
+ *
+ * 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.
+ *
+ ****************************************************************************/
+
+/* Custom written for the TPJ-1022 based on analysis of the GPIO data */
+
+#include <stdlib.h>
+#include "config.h"
+#include "cpu.h"
+#include "system.h"
+#include "button.h"
+#include "kernel.h"
+#include "backlight.h"
+#include "adc.h"
+#include "system.h"
+
+void button_init_device(void)
+{
+    /* No hardware initialisation required as it is done by the bootloader */
+}
+
+bool button_hold(void)
+{
+  return false;
+}
+
+/*
+ * Get button pressed from hardware
+ */
+int button_read_device(void)
+{
+    int btn = BUTTON_NONE;
+    unsigned char state;
+    static bool hold_button = false;
+
+#if 0
+    /* light handling */
+    if (hold_button && !button_hold())
+    {
+        backlight_on();
+    }
+#endif
+
+    hold_button = button_hold();
+    if (!hold_button)
+    {
+        /* Read normal buttons */
+        state = GPIOA_INPUT_VAL;
+        if ((state & 0x2) == 0) btn |= BUTTON_REW;
+        if ((state & 0x4) == 0) btn |= BUTTON_FF;
+        if ((state & 0x80) == 0) btn |= BUTTON_RIGHT;
+
+        /* Buttons left to figure out:
+           button_hold()
+           BUTTON_POWER
+           BUTTON_LEFT
+           BUTTON_UP
+           BUTTON_DOWN
+           BUTTON_MENU
+           BUTTON_REC  
+           BUTTON_AB
+           BUTTON_PLUS
+           BUTTON_MINUS
+        */
+    }
+    
+    return btn;
+}
diff --git a/firmware/target/arm/tatung/tpj1022/lcd-tpj1022.c b/firmware/target/arm/tatung/tpj1022/lcd-tpj1022.c
new file mode 100644
index 0000000000..53f32792c3
--- /dev/null
+++ b/firmware/target/arm/tatung/tpj1022/lcd-tpj1022.c
@@ -0,0 +1,97 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2006 by Barry Wardell
+ *
+ * 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 "lcd.h"
+#include "kernel.h"
+#include "system.h"
+
+/*** hardware configuration ***/
+
+void lcd_set_contrast(int val)
+{
+  /* TODO: Implement lcd_set_contrast() */
+  (void)val;
+}
+
+void lcd_set_invert_display(bool yesno)
+{
+  /* TODO: Implement lcd_set_invert_display() */
+  (void)yesno;
+}
+
+/* turn the display upside down (call lcd_update() afterwards) */
+void lcd_set_flip(bool yesno)
+{
+  /* TODO: Implement lcd_set_flip() */
+  (void)yesno;
+}
+
+/* LCD init */
+void lcd_init_device(void)
+{  
+
+}
+
+/*** update functions ***/
+
+/* Performance function that works with an external buffer
+   note that by and bheight are in 4-pixel units! */
+void lcd_blit(const fb_data* data, int x, int by, int width,
+              int bheight, int stride)
+{
+    /* TODO: Implement lcd_blit() */
+    (void)data;
+    (void)x;
+    (void)by;
+    (void)width;
+    (void)bheight;
+    (void)stride;
+}
+
+/* Performance function to blit a YUV bitmap directly to the LCD */
+void lcd_yuv_blit(unsigned char * const src[3],
+                  int src_x, int src_y, int stride,
+                  int x, int y, int width, int height)
+{
+    (void)src;
+    (void)src_x;
+    (void)src_y;
+    (void)stride;
+    (void)x;
+    (void)y;
+    (void)width;
+    (void)height;
+}
+
+/* Update a fraction of the display. */
+void lcd_update_rect(int x0, int y0, int width, int height)
+{
+    (void)x0;
+    (void)y0;
+    (void)width;
+    (void)height;
+}
+
+/* Update the display.
+   This must be called after all other LCD functions that change the display. */
+void lcd_update(void)
+{
+    lcd_update_rect(0, 0, LCD_WIDTH, LCD_HEIGHT);
+}
diff --git a/firmware/target/arm/tatung/tpj1022/power-tpj1022.c b/firmware/target/arm/tatung/tpj1022/power-tpj1022.c
new file mode 100644
index 0000000000..e8bc4e1fb0
--- /dev/null
+++ b/firmware/target/arm/tatung/tpj1022/power-tpj1022.c
@@ -0,0 +1,67 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2006 by Barry Wardell
+ *
+ * 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.
+ *
+ ****************************************************************************/
+
+/* Created from power.c using some iPod code, and some custom stuff based on 
+   GPIO analysis 
+*/
+
+#include "config.h"
+#include "cpu.h"
+#include <stdbool.h>
+#include "adc.h"
+#include "kernel.h"
+#include "system.h"
+#include "power.h"
+#include "hwcompat.h"
+#include "logf.h"
+#include "usb.h"
+
+#if CONFIG_CHARGING == CHARGING_CONTROL
+bool charger_enabled;
+#endif
+
+void power_init(void)
+{
+}
+
+bool charger_inserted(void)
+{     
+    return false;
+}
+
+void ide_power_enable(bool on)
+{
+    (void)on;
+    /* We do nothing on the iPod */
+}
+
+
+bool ide_powered(void)
+{
+    /* pretend we are always powered - we don't turn it off on the ipod */
+    return true;
+}
+
+void power_off(void)
+{
+    /* Give things a second to settle before cutting power */
+    sleep(HZ);
+    
+    //GPIOF_OUTPUT_VAL &=~ 0x20;
+}
diff --git a/firmware/target/arm/tatung/tpj1022/usb-target.h b/firmware/target/arm/tatung/tpj1022/usb-target.h
new file mode 100644
index 0000000000..7a17f7bacf
--- /dev/null
+++ b/firmware/target/arm/tatung/tpj1022/usb-target.h
@@ -0,0 +1,27 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2006 by Barry Wardelll
+ *
+ * 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.
+ *
+ ****************************************************************************/
+
+/* Based off x5 version */
+
+#ifndef USB_TARGET_H
+#define USB_TARGET_H
+
+bool usb_init_device(void);
+
+#endif
diff --git a/firmware/target/arm/tatung/tpj1022/usb-tpj1022.c b/firmware/target/arm/tatung/tpj1022/usb-tpj1022.c
new file mode 100644
index 0000000000..b238de4369
--- /dev/null
+++ b/firmware/target/arm/tatung/tpj1022/usb-tpj1022.c
@@ -0,0 +1,107 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2006 by Barry Wardell
+ *
+ * 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.
+ *
+ ****************************************************************************/
+
+/* Code from the iPod port but commented out. USB detection custom made based
+   on GPIO analysis */
+
+#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 "string.h"
+#include "hwcompat.h"
+#ifdef HAVE_MMC
+#include "ata_mmc.h"
+#endif
+
+void usb_init_device(void)
+{
+#if 0
+    int r0;
+    outl(inl(0x70000084) | 0x200, 0x70000084);
+
+    outl(inl(0x7000002C) | 0x3000000, 0x7000002C);
+    outl(inl(0x6000600C) | 0x400000, 0x6000600C);
+
+    outl(inl(0x60006004) | 0x400000, 0x60006004);   /* reset usb start */
+    outl(inl(0x60006004) & ~0x400000, 0x60006004);  /* reset usb end */
+
+    outl(inl(0x70000020) | 0x80000000, 0x70000020);
+    while ((inl(0x70000028) & 0x80) == 0);
+
+    outl(inl(0xc5000184) | 0x100, 0xc5000184);
+    while ((inl(0xc5000184) & 0x100) != 0);
+
+    outl(inl(0xc50001A4) | 0x5F000000, 0xc50001A4);
+    if ((inl(0xc50001A4) & 0x100) == 0) {
+        outl(inl(0xc50001A8) & ~0x3, 0xc50001A8);
+        outl(inl(0xc50001A8) | 0x2, 0xc50001A8);
+        outl(inl(0x70000028) | 0x4000, 0x70000028);
+        outl(inl(0x70000028) | 0x2, 0x70000028);
+    } else {
+        outl(inl(0xc50001A8) | 0x3, 0xc50001A8);
+        outl(inl(0x70000028) &~0x4000, 0x70000028);
+        outl(inl(0x70000028) | 0x2, 0x70000028);
+    }
+    outl(inl(0xc5000140) | 0x2, 0xc5000140);
+    while((inl(0xc5000140) & 0x2) != 0);
+    r0 = inl(0xc5000184);
+
+    /* Note from IPL source (referring to next 5 lines of code: 
+       THIS NEEDS TO BE CHANGED ONCE THERE IS KERNEL USB */
+    outl(inl(0x70000020) | 0x80000000, 0x70000020);
+    outl(inl(0x6000600C) | 0x400000, 0x6000600C);
+    while ((inl(0x70000028) & 0x80) == 0);
+    outl(inl(0x70000028) | 0x2, 0x70000028);
+
+    udelay(0x186A0);
+#endif
+}
+
+bool usb_detect(void)
+{
+    return false;
+}
+
+void usb_enable(bool on)
+{
+    (void)on;
+#if 0
+    /* For the ipod, we can only do one thing with USB mode - reboot
+       into Apple's flash-based disk-mode.  This does not return. */
+    if (on)
+    {
+      /* The following code is copied from ipodlinux */
+        unsigned char* storage_ptr = (unsigned char *)0x40017F00;
+        memcpy(storage_ptr, "diskmode\0\0hotstuff\0\0\1", 21);
+        DEV_RS |= 4; /* Reboot */
+    }
+#endif
+}