iPod Classic: use PMU interrupts to detect USB and FW

Change-Id: I9be733e1a943ddeb99335d362f81f74879eeb94b

firmware/target/arm/s5l8700/usb-nano2g-6g.c

@@ -27,7 +27,6 @@
 #ifdef HAVE_USBSTACK
 #include "usb_core.h"
 #include "usb_drv.h"
-#include "power.h"
 
 void usb_enable(bool on)
 {
@@ -35,6 +34,9 @@ void usb_enable(bool on)
     else usb_core_exit();
 }
 
+#if CONFIG_CPU==S5L8701
+#include "power.h"
+
 int usb_detect(void)
 {
     if (power_input_status() & POWER_INPUT_USB)
@@ -42,6 +44,31 @@ int usb_detect(void)
     return USB_EXTRACTED;
 }
 
+#elif CONFIG_CPU==S5L8702
+static int usb_status = USB_EXTRACTED;
+
+int usb_detect(void)
+{
+    return usb_status;
+}
+
+void usb_insert_int(void)
+{
+    usb_status = USB_INSERTED;
+#ifdef USB_STATUS_BY_EVENT
+    usb_status_event(USB_INSERTED);
+#endif
+}
+
+void usb_remove_int(void)
+{
+    usb_status = USB_EXTRACTED;
+#ifdef USB_STATUS_BY_EVENT
+    usb_status_event(USB_EXTRACTED);
+#endif
+}
+#endif /* S5L8702 */
+
 void usb_init_device(void)
 {
     /* Power up the core clocks to allow writing
@@ -59,7 +86,8 @@ void usb_init_device(void)
 
     usb_drv_exit();
 }
-#else
+
+#else /* !HAVE_STACK */
 void usb_enable(bool on)
 {
     (void)on;

firmware/target/arm/s5l8702/debug-s5l8702.c

@@ -122,7 +122,7 @@ bool dbg_hw_info(void)
             _DEBUG_PRINTF("brightness value: %d", pmu_read(0x28));
             line++;
             _DEBUG_PRINTF("USB present: %s",
-                            pmu_usb_present() ? "true" : "false");
+                    (power_input_status() & POWER_INPUT_USB) ? "true" : "false");
 #if CONFIG_CHARGING
             _DEBUG_PRINTF("FW present: %s",
                             pmu_firewire_present() ? "true" : "false");

firmware/target/arm/s5l8702/ipod6g/pmu-ipod6g.c

@@ -161,18 +161,12 @@ static struct eint_handler pmu_eint = {
 };
 
 static int pmu_input_holdswitch;
-static int pmu_input_usb;
 
 int pmu_holdswitch_locked(void)
 {
    return pmu_input_holdswitch;
 }
 
-int pmu_usb_present(void)
-{
-   return pmu_input_usb;
-}
-
 #ifdef IPOD_ACCESSORY_PROTOCOL
 static int pmu_input_accessory;
 
@@ -206,7 +200,10 @@ static void pmu_read_inputs_gpio(void)
 static void pmu_read_inputs_ooc(void)
 {
     unsigned char oocstat = pmu_read(PCF5063X_REG_OOCSTAT);
-    pmu_input_usb = !!(oocstat & PCF5063X_OOCSTAT_EXTON2);
+    if (oocstat & PCF5063X_OOCSTAT_EXTON2)
+        usb_insert_int();
+    else
+        usb_remove_int();
 #ifdef IPOD_ACCESSORY_PROTOCOL
     pmu_input_accessory = !(oocstat & PCF5063X_OOCSTAT_EXTON3);
 #endif

firmware/target/arm/s5l8702/ipod6g/pmu-target.h

@@ -92,7 +92,6 @@ void pmu_write_rtc(unsigned char* buffer);
 void pmu_hdd_power(bool on);
 
 int pmu_holdswitch_locked(void);
-int pmu_usb_present(void);
 #if CONFIG_CHARGING
 int pmu_firewire_present(void);
 #endif

firmware/target/arm/s5l8702/ipod6g/power-ipod6g.c

@@ -119,17 +119,12 @@ void usb_charging_maxcurrent_change(int maxcurrent)
 
 unsigned int power_input_status(void)
 {
-    /* This checks if USB Vbus is present. */
-    if (!(PDAT(12) & 0x8)) return POWER_INPUT_USB_CHARGER;
-
-    /* If USB Vbus is not present, check if we have a positive power balance
-       regardless. This would indicate FireWire charging. Note that this will
-       drop to POWER_INPUT_NONE if FireWire isn't able to supply enough current
-       for device operation, e.g. during disk spinup. */
-    if (PDAT(11) & 0x20) return POWER_INPUT_NONE;
-
-    /* Looks like we have FireWire power. */
-    return POWER_INPUT_MAIN_CHARGER;
+    unsigned int status = POWER_INPUT_NONE;
+    if (usb_detect() == USB_INSERTED)
+        status |= POWER_INPUT_USB_CHARGER;
+    if (pmu_firewire_present())
+        status |= POWER_INPUT_MAIN_CHARGER;
+    return status;
 }
 
 bool charging_state(void)

firmware/target/arm/s5l8702/system-target.h

@@ -47,6 +47,9 @@ static inline void udelay(unsigned usecs)
     while (TIME_BEFORE(USEC_TIMER, stop));
 }
 
+void usb_insert_int(void);
+void usb_remove_int(void);
+
 #ifdef BOOTLOADER
 void system_preinit(void);
 #endif