prepared Ondio USB passthrough (but doesn't work yet)

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@5066 a1c6a512-1295-4272-9138-f99709370657

firmware/drivers/ata.c

@@ -1174,4 +1174,4 @@ int ata_init(void)
     return 0;
 }
 
-#endif /* #ifndef HAVE_MMC */
+#endif /* #ifndef HAVE_MMC */

firmware/drivers/ata_mmc.c

@@ -29,6 +29,7 @@
 #include "power.h"
 #include "string.h"
 #include "hwcompat.h"
+#include "adc.h"
 
 /* use file for an MMC-based system, FIXME in makefile */
 #ifdef HAVE_MMC 
@@ -257,9 +258,23 @@ int ata_init(void)
 
     led(false);
 
-    /* ToDo: Port setup */
-    // PAIOR |= 0x1680;
+    /* Port setup */
+    PADR |= 0x1600; /* set all the selects high (=inactive) */
+    PAIOR |= 0x1600; /* make outputs for them */
+    PAIOR &= ~0x0008; /* input for card detect */
 
+    /* serial setup */
+    PBCR1 &= ~0x0CF0; /* use PB10, PB11, PB13 */
+    PBCR1 |=  0x08A0; /*  as RxD1, TxD1, SCK1 */
+
+    if(adc_read(ADC_MMC_SWITCH) < 0x200)
+    {   /* MMC inserted */
+        PADR |= 0x0200;
+    }
+    else
+    {   /* no MMC, use internal memory */
+        PADR |= 0x0400;
+    }
 
     sleeping = false;
     ata_enable(true);

firmware/export/adc.h

@@ -23,8 +23,7 @@
 
 #ifdef HAVE_ONDIO_ADC
 
-#define ADC_MMC_SWITCH          0 /* Battery voltage always reads 0x3FF due to
-                                     silly scaling */
+#define ADC_MMC_SWITCH          0 /* low values if MMC inserted */
 #define ADC_USB_POWER           1 /* USB, reads 0x000 when USB is inserted */
 #define ADC_BUTTON_OPTION       2 /* the option button, low value if pressed */
 #define ADC_BUTTON_ONOFF        3 /* the on/off button, high value if pressed */

firmware/usb.c

@@ -84,9 +84,9 @@ static void usb_enable(bool on)
     }
     else
     {
-        and_b(~0x20, &PADRL);
+        and_b(~0x20, &PADRL); /* disable USB */
     }
-    or_b(0x20, &PAIORL);
+    or_b(0x20, &PAIORL); /* output for USB enable */
 #else /* standard HD Jukebox */
     if(on)
     {