2010-05-24 Joel Sherrill <joel.sherrill@oarcorp.com>

* Makefile.am, amba/amba.c, console/console.c, console/debugputs.c,
	startup/bspstart.c: Rework initialization order so AMBA bus is
	scanned earlier. This lets us look for UARTs earlier and support
	printk as early as bsp_start() returning.

c/src/lib/libbsp/sparc/leon3/ChangeLog

@@ -1,3 +1,10 @@
+2010-05-24	Joel Sherrill <joel.sherrill@oarcorp.com>
+
+	* Makefile.am, amba/amba.c, console/console.c, console/debugputs.c,
+	startup/bspstart.c: Rework initialization order so AMBA bus is
+	scanned earlier. This lets us look for UARTs earlier and support
+	printk as early as bsp_start() returning.
+
 2010-05-11	Sebastian Huber <sebastian.huber@embedded-brains.de>
 
 	* startup/linkcmds: Include basic linker command file and define only

c/src/lib/libbsp/sparc/leon3/Makefile.am

@@ -39,7 +39,7 @@ libbsp_a_SOURCES =
 # startup
 libbsp_a_SOURCES += ../../shared/bspclean.c ../../shared/bsplibc.c \
     ../../shared/bsppost.c ../../shared/bootcard.c startup/bspstart.c \
-    ../../sparc/shared/bsppretaskinghook.c \
+    ../../sparc/shared/bsppretaskinghook.c ../../shared/bsppredriverhook.c \
     ../../sparc/shared/bspgetworkarea.c ../../shared/sbrk.c startup/setvec.c \
     startup/spurious.c startup/bspidle.S
 # gnatsupp

c/src/lib/libbsp/sparc/leon3/amba/amba.c

@@ -24,9 +24,9 @@ volatile LEON3_IrqCtrl_Regs_Map *LEON3_IrqCtrl_Regs;
 int LEON3_Cpu_Index = 0;
 
 /*
- *  bsp_predriver_hook
+ *  amba_initialize
  *
- *  BSP predriver hook.  Called just before drivers are initialized.
+ *  Must be called just before drivers are initialized.
  *  Used to scan system bus. Probes for AHB masters, AHB slaves and
  *  APB slaves. Addresses to configuration areas of the AHB masters,
  *  AHB slaves, APB slaves and APB master are storeds in
@@ -43,8 +43,9 @@ asm(" .text  \n"
 
 
 extern rtems_configuration_table Configuration;
+extern int scan_uarts(void);
 
-void bsp_predriver_hook(void)
+void amba_initialize(void)
 {
   int i;
   amba_apb_device dev;
@@ -71,4 +72,6 @@ void bsp_predriver_hook(void)
     LEON3_Timer_Regs = (volatile LEON3_Timer_Regs_Map *) dev.start;
   }
 
+  /* find UARTS */
+  scan_uarts();
 }

c/src/lib/libbsp/sparc/leon3/console/console.c

@@ -76,27 +76,8 @@ ssize_t console_write_support (int minor, const char *buf, size_t len)
  *
  */
 int uarts = 0;
-static int isinit = 0;
 volatile LEON3_UART_Regs_Map *LEON3_Console_Uart[LEON3_APBUARTS];
 
-int scan_uarts(void) {
-  int i;
-  amba_apb_device apbuarts[LEON3_APBUARTS];
-
-  if (isinit == 0) {
-    i = 0;
-    uarts = 0;
-
-    uarts = amba_find_apbslvs(
-      &amba_conf, VENDOR_GAISLER, GAISLER_APBUART, apbuarts, LEON3_APBUARTS);
-    for(i=0; i<uarts; i++) {
-      LEON3_Console_Uart[i] = (volatile LEON3_UART_Regs_Map *)apbuarts[i].start;
-    }
-    isinit = 1;
-  }
-  return uarts;
-}
-
 rtems_device_driver console_initialize(
   rtems_device_major_number  major,
   rtems_device_minor_number  minor,
@@ -109,10 +90,7 @@ rtems_device_driver console_initialize(
 
   rtems_termios_initialize();
 
-  /* Find UARTs */
-  scan_uarts();
-
-  /* default to zero and override if multiprocessing */
+  /* default console to zero and override if multiprocessing */
   uart0 = 0;
   #if defined(RTEMS_MULTIPROCESSING)
     if (rtems_configuration_get_user_multiprocessing_table() != NULL)
@@ -120,22 +98,18 @@ rtems_device_driver console_initialize(
   #endif
 
   /*  Register Device Names */
-
-  if (uarts && (uart0 < uarts))
-  {
+  if (uarts && (uart0 < uarts)) {
     status = rtems_io_register_name( "/dev/console", major, 0 );
     if (status != RTEMS_SUCCESSFUL)
       rtems_fatal_error_occurred(status);
 
     strcpy(console_name,"/dev/console_a");
-    for (i = uart0+1; i < uarts; i++)
-    {
+    for (i = uart0+1; i < uarts; i++) {
       console_name[13]++;
       status = rtems_io_register_name( console_name, major, i);
     }
   }
 
-
   /*
    *  Initialize Hardware if ONLY CPU or first CPU in MP system
    */

c/src/lib/libbsp/sparc/leon3/console/debugputs.c

@@ -27,6 +27,38 @@
  */
 extern int uarts;
 
+static int isinit = 0;
+
+/*
+ *  Scan for UARTS in configuration
+ */
+int scan_uarts(void)
+{
+  int i;
+  amba_apb_device apbuarts[LEON3_APBUARTS];
+
+  if (isinit == 0) {
+    i = 0;
+    uarts = 0;
+
+    uarts = amba_find_apbslvs(
+      &amba_conf, VENDOR_GAISLER, GAISLER_APBUART, apbuarts, LEON3_APBUARTS);
+    for(i=0; i<uarts; i++) {
+      LEON3_Console_Uart[i] = (volatile LEON3_UART_Regs_Map *)apbuarts[i].start;
+    }
+
+    /* initialize uart 0 if present for printk */
+    if ( uarts ) {
+      LEON3_Console_Uart[0]->ctrl |=
+        LEON_REG_UART_CTRL_RE | LEON_REG_UART_CTRL_TE;
+      LEON3_Console_Uart[0]->status = 0;
+    }
+    isinit = 1;
+  }
+
+  return uarts;
+}
+
 /*
  *  console_outbyte_polled
  *

c/src/lib/libbsp/sparc/leon3/startup/bspstart.c

@@ -27,6 +27,8 @@
  */
 int CPU_SPARC_HAS_SNOOPING;
 
+extern void amba_initialize(void);
+
 /*
  * set_snooping
  *
@@ -54,4 +56,7 @@ static inline int set_snooping(void)
 void bsp_start( void )
 {
   CPU_SPARC_HAS_SNOOPING = set_snooping();
+
+  /* Find UARTs */
+  amba_initialize();
 }