Sansa Connect: Working USB Mass Storage

Acknowledge SYS_USB_CONNECTED in all queues so USB task can gain
exclusive access to the storage.

Reduce CPPI requeue timeout to speed up disk access.

Change-Id: I322aae4cac679696bb8186ccacf838a18f0715e9

bootloader/sansaconnect.c

@@ -172,6 +172,49 @@ static void clear_recoverzap(void)
     }
 }
 
+static void handle_usb(int connect_timeout)
+{
+    long end_tick = 0;
+
+    if (usb_detect() != USB_INSERTED)
+    {
+        return;
+    }
+
+    usb_init();
+    usb_start_monitoring();
+
+    printf("USB: Connecting");
+
+    if (connect_timeout != TIMEOUT_BLOCK)
+    {
+        end_tick = current_tick + connect_timeout;
+    }
+
+    while (usb_detect() == USB_INSERTED)
+    {
+        if (button_get_w_tmo(HZ/2) == SYS_USB_CONNECTED)
+        {
+            printf("Bootloader USB mode");
+            usb_acknowledge(SYS_USB_CONNECTED_ACK);
+            while (button_get_w_tmo(HZ/2) != SYS_USB_DISCONNECTED)
+            {
+                storage_spin();
+            }
+            break;
+        }
+
+        if (connect_timeout != TIMEOUT_BLOCK &&
+            TIME_AFTER(current_tick, end_tick))
+        {
+            printf("USB: Timed out");
+            break;
+        }
+    }
+
+    usb_close();
+}
+
 extern void show_logo(void);
 
 void main(void)
@@ -203,12 +246,8 @@ void main(void)
     reset_screen();
     show_logo();
 
-    btn = button_read_device();
-
     printf("Rockbox boot loader");
     printf("Version %s", rbversion);
-    usb_init();
-    usb_start_monitoring();
 
     clear_recoverzap();
 
@@ -218,21 +257,14 @@ void main(void)
 
     filesystem_init();
 
-    if (usb_detect() == USB_INSERTED)
-    {
-        usb_enable(true);
-        while (usb_detect() == USB_INSERTED)
-        {
-            sleep(HZ);
-            storage_spin();
-        }
-        usb_enable(false);
-    }
+    handle_usb(2*HZ);
 
     ret = disk_mount_all();
     if (ret <= 0)
         error(EDISK, ret, true);
 
+    btn = button_read_device();
+
     if (btn & BUTTON_PREV)
     {
         printf("Loading OF firmware...");

firmware/export/config.h

@@ -902,6 +902,10 @@ Lyre prototype 1 */
 #define INCLUDE_TIMEOUT_API
 #define USB_DRIVER_CLOSE
 #endif
+#if defined(HAVE_USBSTACK) && CONFIG_USBOTG == USBOTG_TNETV105
+#define INCLUDE_TIMEOUT_API
+#define USB_DRIVER_CLOSE
+#endif
 #endif
 
 #else /* !BOOTLOADER */

firmware/target/arm/tms320dm320/sansa-connect/avr-sansaconnect.c

@@ -375,6 +375,12 @@ void btn_thread(void)
     {
         queue_wait(&btn_queue, &ev);
 
+        if (ev.id == SYS_USB_CONNECTED)
+        {
+            /* Allow USB to gain exclusive storage access */
+            usb_acknowledge(SYS_USB_CONNECTED_ACK);
+        }
+
         /* Ignore all messages except BTN_INTERRUPT */
         if (ev.id != BTN_INTERRUPT)
             continue;

firmware/target/arm/tms320dm320/sansa-connect/tnetv105_usb_drv.c

@@ -1034,7 +1034,7 @@ static int cppi_timeout_cb(struct timeout *tmo)
     int flags = disable_irq_save();
     bool requeue = tnetv_handle_cppi();
     restore_irq(flags);
-    return requeue ? HZ/10 : 0;
+    return requeue ? 1 : 0;
 }
 
 void VLYNQ(void) __attribute__ ((section(".icode")));
@@ -1205,7 +1205,7 @@ void VLYNQ(void)
 
         if (tnetv_handle_cppi())
         {
-            timeout_register(&cppi_timeout, cppi_timeout_cb, HZ/10, 0);
+            timeout_register(&cppi_timeout, cppi_timeout_cb, 1, 0);
         }
     }
 }

firmware/target/arm/tms320dm320/sdmmc-dm320.c

@@ -781,20 +781,10 @@ int sd_read_sectors(IF_MD(int card_no,) unsigned long start, int incount,
 int sd_write_sectors(IF_MD(int card_no,) unsigned long start, int count,
                       const void* outbuf)
 {
-#ifndef BOOTLOADER
 #ifndef HAVE_MULTIDRIVE
     const int card_no = 0;
 #endif
     return sd_transfer_sectors(card_no, start, count, (void*)outbuf, true);
-#else /* we don't need write support in bootloader */
-#ifdef HAVE_MULTIDRIVE
-    (void)card_no;
-#endif
-    (void)start;
-    (void)count;
-    (void)outbuf;
-    return 0;
-#endif
 }
 
 int sd_init(void)
@@ -809,9 +799,7 @@ int sd_init(void)
 
     mutex_lock(&sd_mtx);
 
-#ifndef BOOTLOADER
     enable_controller(false);
-#endif
 
     /* based on linux/drivers/mmc/dm320mmc.c
        Copyright (C) 2006 ZSI, All Rights Reserved.
@@ -859,8 +847,6 @@ int sd_init(void)
 #endif
 #endif
 
-    sd_select_device(1);
-
     /* Disable Memory Card CLK - it is enabled on demand by TMS320DM320 */
     bitclr16(&IO_MMC_MEM_CLK_CONTROL, (1 << 8));
     mutex_unlock(&sd_mtx);