From 207131c53b15e7b5956177e90932b7445ff5b4ce Mon Sep 17 00:00:00 2001
From: Michael Sevakis <jethead71@rockbox.org>
Date: Wed, 14 Sep 2011 14:05:07 +0000
Subject: Convert ARC USB driver code to always use setup packet detection and
 remove the bus-reset-based detection method for it. This prevents false USB
 detection from chargers or other accesories that aren't actually a host but
 can trigger the bus reset condition.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30546 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/target/arm/usb-drv-arc.c | 93 +++++++++++++--------------------------
 1 file changed, 31 insertions(+), 62 deletions(-)

(limited to 'firmware/target')

diff --git a/firmware/target/arm/usb-drv-arc.c b/firmware/target/arm/usb-drv-arc.c
index f252f11f3e..855f67e4c3 100644
--- a/firmware/target/arm/usb-drv-arc.c
+++ b/firmware/target/arm/usb-drv-arc.c
@@ -428,9 +428,31 @@ void usb_drv_startup(void)
     }
 }
 
+#ifdef LOGF_ENABLE
+#define XFER_DIR_STR(dir) ((dir) ? "IN" : "OUT")
+#define XFER_TYPE_STR(type) \
+    ((type) == USB_ENDPOINT_XFER_CONTROL ? "CTRL" : \
+     ((type) == USB_ENDPOINT_XFER_ISOC ? "ISOC" : \
+      ((type) == USB_ENDPOINT_XFER_BULK ? "BULK" : \
+       ((type) == USB_ENDPOINT_XFER_INT ? "INTR" : "INVL"))))
+
+static void log_ep(int ep_num, int ep_dir, char* prefix)
+{
+    usb_endpoint_t* endpoint = &endpoints[ep_num];
+
+    logf("%s: ep%d %s %s %d", prefix, ep_num, XFER_DIR_STR(ep_dir),
+            XFER_TYPE_STR(endpoint->type[ep_dir]),
+            endpoint->max_pkt_size[ep_dir]);
+}
+#else
+#undef log_ep
+#define log_ep(...)
+#endif
+
 /* manual: 32.14.1 Device Controller Initialization */
-static void _usb_drv_init(bool attach)
+void usb_drv_init(void)
 {
+    /* USB core decides */
     usb_drv_reset();
 
     REG_USBMODE = USBMODE_CTRL_MODE_DEVICE;
@@ -447,19 +469,12 @@ static void _usb_drv_init(bool attach)
     REG_ENDPOINTLISTADDR = (unsigned int)qh_array;
     REG_DEVICEADDR = 0;
 
-    if (!attach) {
-        /* enable RESET interrupt */
-        REG_USBINTR = USBINTR_RESET_EN;
-    }
-    else
-    {
-        /* enable USB interrupts */
-        REG_USBINTR =
-            USBINTR_INT_EN |
-            USBINTR_ERR_INT_EN |
-            USBINTR_PTC_DETECT_EN |
-            USBINTR_RESET_EN;
-    }
+    /* enable USB interrupts */
+    REG_USBINTR =
+        USBINTR_INT_EN |
+        USBINTR_ERR_INT_EN |
+        USBINTR_PTC_DETECT_EN |
+        USBINTR_RESET_EN;
 
     usb_drv_int_enable(true);
 
@@ -472,49 +487,12 @@ static void _usb_drv_init(bool attach)
     logf("usb dccparams %x", REG_DCCPARAMS);
 
     /* now a bus reset will occur. see bus_reset() */
-    (void)attach;
-}
-
-#ifdef LOGF_ENABLE
-#define XFER_DIR_STR(dir) ((dir) ? "IN" : "OUT")
-#define XFER_TYPE_STR(type) \
-    ((type) == USB_ENDPOINT_XFER_CONTROL ? "CTRL" : \
-     ((type) == USB_ENDPOINT_XFER_ISOC ? "ISOC" : \
-      ((type) == USB_ENDPOINT_XFER_BULK ? "BULK" : \
-       ((type) == USB_ENDPOINT_XFER_INT ? "INTR" : "INVL"))))
-
-static void log_ep(int ep_num, int ep_dir, char* prefix)
-{
-    usb_endpoint_t* endpoint = &endpoints[ep_num];
-
-    logf("%s: ep%d %s %s %d", prefix, ep_num, XFER_DIR_STR(ep_dir),
-            XFER_TYPE_STR(endpoint->type[ep_dir]),
-            endpoint->max_pkt_size[ep_dir]);
-}
-#else
-#undef log_ep
-#define log_ep(...)
-#endif
-
-void usb_drv_init(void)
-{
-#ifdef USB_DETECT_BY_CORE
-    /* USB core decides */
-    _usb_drv_init(true);
-#else
-    /* Use bus reset condition */
-    _usb_drv_init(false);
-#endif
 }
 
 /* fully enable driver */
 void usb_drv_attach(void)
 {
     logf("usb_drv_attach");
-#ifndef USB_DETECT_BY_CORE
-    sleep(HZ/10);
-    _usb_drv_init(true);
-#endif
 }
 
 void usb_drv_exit(void)
@@ -563,17 +541,8 @@ void usb_drv_int(void)
     /* reset interrupt */
     if (status & USBSTS_RESET) {
         REG_USBSTS = USBSTS_RESET;
-
-        if (UNLIKELY(usbintr == USBINTR_RESET_EN)) {
-            /* USB detected - detach and inform */
-            usb_drv_stop();
-            usb_drv_usb_detect_event();
-        }
-        else
-        {
-            bus_reset();
-            usb_core_bus_reset(); /* tell mom */
-        }
+        bus_reset();
+        usb_core_bus_reset(); /* tell mom */
     }
 
     /* port change */
-- 
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