20000317 sourceware import

libgloss/mips/jmr3904-io.c

@@ -0,0 +1,104 @@
+
+
+#define READ_UINT8( _register_, _value_ ) \
+        ((_value_) = *((volatile unsigned char *)(_register_)))
+
+#define WRITE_UINT8( _register_, _value_ ) \
+        (*((volatile unsigned char *)(_register_)) = (_value_))
+
+ /* - Board specific addresses for serial chip */
+#define DIAG_BASE       0xfffff300
+#define DIAG_SLCR       (DIAG_BASE+0x00)
+#define DIAG_SLSR       (DIAG_BASE+0x04)
+#define DIAG_SLDICR     (DIAG_BASE+0x08)
+#define DIAG_SLDISR     (DIAG_BASE+0x0C)
+#define DIAG_SFCR       (DIAG_BASE+0x10)
+#define DIAG_SBRG       (DIAG_BASE+0x14)
+#define DIAG_TFIFO      (DIAG_BASE+0x20)
+#define DIAG_RFIFO      (DIAG_BASE+0x30)
+
+#define BRG_T0          0x0000
+#define BRG_T2          0x0100
+#define BRG_T4          0x0200
+#define BRG_T5          0x0300
+
+
+#define READ_UINT16( _register_, _value_ ) \
+     ((_value_) = *((volatile unsigned short *)(_register_)))
+
+#define WRITE_UINT16( _register_, _value_ ) \
+     (*((volatile unsigned short *)(_register_)) = (_value_))
+
+unsigned char
+inbyte (void)
+{
+  unsigned char c;
+  unsigned short disr;
+  
+  for (;;)
+    {
+      READ_UINT16 (DIAG_SLDISR, disr);
+      if (disr & 0x0001)
+	break;
+    }
+  disr = disr & ~0x0001;
+  READ_UINT8 (DIAG_RFIFO, c);
+  WRITE_UINT16 (DIAG_SLDISR, disr);
+  return c;
+}
+
+void
+outbyte (unsigned char c)
+{
+  unsigned short disr;
+  
+  for (;;)
+    {
+      READ_UINT16 (DIAG_SLDISR, disr);
+      if (disr & 0x0002)
+	break;
+    }
+  disr = disr & ~0x0002;
+  WRITE_UINT8 (DIAG_TFIFO, c);
+  WRITE_UINT16 (DIAG_SLDISR, disr);
+}
+
+/* Stuff required to setup IO on this board */
+void board_serial_init (void)
+{
+  WRITE_UINT16 (DIAG_SLCR, 0x0020);
+  WRITE_UINT16 (DIAG_SLDICR, 0x0000);
+  WRITE_UINT16 (DIAG_SFCR, 0x0000);
+  WRITE_UINT16 (DIAG_SBRG, BRG_T2 | 5);
+}
+
+/* If you want this to be initialized as part of the stuff which gets called
+   by crt0, it should be named 'hardware_init_hook'.
+   Local implementations may want to move or add to this function OR
+   do the initializations after main() is entered.
+*/
+void hardware_init_hook(void)
+{
+  board_serial_init() ;
+}
+     
+/* Structure filled in by get_mem_info.  Only the size field is
+   actually used (by sbrk), so the others aren't even filled in.  */
+
+struct s_mem
+{
+  unsigned int size;
+  unsigned int icsize;
+  unsigned int dcsize;
+};
+
+/* mem_size is provided in the linker script so that we don't have to
+   define it here. */
+extern char _mem_size[];
+
+void
+get_mem_info (mem)
+     struct s_mem *mem;
+{
+  mem->size = (unsigned int)_mem_size;
+}