Add trace support to generic board

Add hooks for tracing to generic board, including:

- allow early tracing to start early as possible in U-Boot
- reserve memory for trace buffer
- copy early trace buffer to main trace buffer after relocation
- setup full tracing support after relocation

Signed-off-by: Simon Glass <sjg@chromium.org>

common/board_f.c

@@ -53,6 +53,7 @@
 #include <os.h>
 #include <post.h>
 #include <spi.h>
+#include <trace.h>
 #include <watchdog.h>
 #include <asm/errno.h>
 #include <asm/io.h>
@@ -500,6 +501,18 @@ static int reserve_lcd(void)
 }
 #endif /* CONFIG_LCD */
 
+static int reserve_trace(void)
+{
+#ifdef CONFIG_TRACE
+	gd->relocaddr -= CONFIG_TRACE_BUFFER_SIZE;
+	gd->trace_buff = map_sysmem(gd->relocaddr, CONFIG_TRACE_BUFFER_SIZE);
+	debug("Reserving %dk for trace data at: %08lx\n",
+	      CONFIG_TRACE_BUFFER_SIZE >> 10, gd->relocaddr);
+#endif
+
+	return 0;
+}
+
 #if defined(CONFIG_VIDEO) && (!defined(CONFIG_PPC) || defined(CONFIG_8xx)) \
 		&& !defined(CONFIG_ARM) && !defined(CONFIG_X86)
 static int reserve_video(void)
@@ -818,8 +831,9 @@ static init_fnc_t init_sequence_f[] = {
 #ifdef CONFIG_SANDBOX
 	setup_ram_buf,
 #endif
-	setup_fdt,
 	setup_mon_len,
+	setup_fdt,
+	trace_early_init,
 #if defined(CONFIG_MPC85xx) || defined(CONFIG_MPC86xx)
 	/* TODO: can this go into arch_cpu_init()? */
 	probecpu,
@@ -963,6 +977,7 @@ static init_fnc_t init_sequence_f[] = {
 #ifdef CONFIG_LCD
 	reserve_lcd,
 #endif
+	reserve_trace,
 	/* TODO: Why the dependency on CONFIG_8xx? */
 #if defined(CONFIG_VIDEO) && (!defined(CONFIG_PPC) || defined(CONFIG_8xx)) \
 		&& !defined(CONFIG_ARM) && !defined(CONFIG_X86)

common/board_r.c

@@ -58,6 +58,7 @@
 #include <serial.h>
 #include <spi.h>
 #include <stdio_dev.h>
+#include <trace.h>
 #include <watchdog.h>
 #ifdef CONFIG_ADDR_MAP
 #include <asm/mmu.h>
@@ -106,6 +107,15 @@ static int initr_secondary_cpu(void)
 	return 0;
 }
 
+static int initr_trace(void)
+{
+#ifdef CONFIG_TRACE
+	trace_init(gd->trace_buff, CONFIG_TRACE_BUFFER_SIZE);
+#endif
+
+	return 0;
+}
+
 static int initr_reloc(void)
 {
 	gd->flags |= GD_FLG_RELOC;	/* tell others: relocation done */
@@ -711,6 +721,7 @@ static int run_main_loop(void)
  * TODO: perhaps reset the watchdog in the initcall function after each call?
  */
 init_fnc_t init_sequence_r[] = {
+	initr_trace,
 	initr_reloc,
 	/* TODO: could x86/PPC have this also perhaps? */
 #ifdef CONFIG_ARM

include/asm-generic/global_data.h

@@ -82,6 +82,9 @@ typedef struct global_data {
 	unsigned long fdt_size;	/* Space reserved for relocated FDT */
 	void **jt;		/* jump table */
 	char env_buf[32];	/* buffer for getenv() before reloc. */
+#ifdef CONFIG_TRACE
+	void		*trace_buff;	/* The trace buffer */
+#endif
 	struct arch_global_data arch;	/* architecture-specific data */
 } gd_t;
 #endif