Improved RoLo support for PortalPlayer - handles the COP correctly

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@12511 a1c6a512-1295-4272-9138-f99709370657

apps/main.c

@@ -549,10 +549,15 @@ void cop_main(void)
    so it should not be assumed that the coprocessor be usable even on
    platforms which support it.
 
-   At present all we do is send the COP to sleep if anything wakes it. */
-    while(1) {
+   At present the COP sleeps unless it receives a message from the CPU telling
+   it that we are loading a new kernel, so must reboot */
+
+    extern volatile unsigned char cpu_message;
+
+    while(cpu_message != COP_REBOOT) {
         COP_CTL = PROC_SLEEP;
     }
+    rolo_restart_cop();
 }
 #endif
 

firmware/export/config.h

@@ -280,6 +280,8 @@
 
 #define NUM_CORES 1
 #define CURRENT_CORE 0
+
+#define COP_REBOOT 0x00000001
 #else
 #define NUM_CORES 1
 #define CURRENT_CORE 0

firmware/export/rolo.h

@@ -21,4 +21,8 @@
 
 void rolo_load(char* file);
 
+#ifdef CPU_PP
+void rolo_restart_cop(void);
+#endif
+
 #endif

firmware/rolo.c

@@ -36,6 +36,38 @@
 
 #define IRQ0_EDGE_TRIGGER 0x80
 
+#ifdef CPU_PP
+/* Handle the COP properly - it needs to jump to a function outside SDRAM while
+ * the new firmware is being loaded, and then jump to the start of SDRAM
+ * TODO: Use the mailboxes built into the PP processor for this
+ */
+
+volatile unsigned char IDATA_ATTR cpu_message = 0;
+volatile unsigned char IDATA_ATTR cpu_reply = 0;
+
+void rolo_restart_cop(void) ICODE_ATTR;
+void rolo_restart_cop(void)
+{
+    /* Invalidate cache */
+    outl(inl(0xf000f044) | 0x6, 0xf000f044);
+    while ((inl(0x6000c000) & 0x8000) != 0) {}
+    
+    /* Disable cache */
+    outl(0x0, 0x6000C000);
+
+    /* Wait while RoLo loads the image into SDRAM */
+    /* TODO: Accept checksum failure gracefully */
+    while(cpu_message == 1) {}
+
+    cpu_reply = 1;
+
+    asm volatile(
+        "mov   r0, #0x10000000   \n"
+        "mov   pc, r0            \n"
+    );
+}
+#endif
+
 static void rolo_error(const char *text)
 {
     lcd_clear_display();
@@ -78,6 +110,9 @@ void rolo_restart(const unsigned char* source, unsigned char* dest,
         : : "a"(dest)
     );
 #elif (CONFIG_CPU==PP5020) || (CONFIG_CPU==PP5024)
+
+    cpu_message = 0;
+
     /* Flush cache */
     outl(inl(0xf000f044) | 0x2, 0xf000f044);
     while ((inl(0x6000c000) & 0x8000) != 0) {}
@@ -89,6 +124,8 @@ void rolo_restart(const unsigned char* source, unsigned char* dest,
     for (i=0;i<8;i++)
         memmapregs[i]=0;
 
+    while(cpu_reply != 1) {}
+
     asm volatile(
         "mov   r0, #0x10000000   \n"
         "mov   pc, r0            \n"
@@ -150,6 +187,10 @@ int rolo_load(const char* filename)
 
     /* Rockbox checksums are big-endian */
     file_checksum = betoh32(file_checksum);
+#ifdef CPU_PP
+    cpu_message = COP_REBOOT;
+    COP_CTL = PROC_WAKE;
+#endif
 
     lseek(fd, FIRMWARE_OFFSET_FILE_DATA, SEEK_SET);