[U-Boot] [PATCH 02/22] spl: Add support for logging in SPL and TPL

[Simon Glass]

It is sometimes useful to log information in SPL and TPL. Add support for
this.

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

 common/Kconfig   | 36 ++++++++++++++++++++++++++++++++++--
 common/Makefile  |  4 ++--
 common/spl/spl.c |  7 +++++++
 include/log.h    |  7 ++++++-
 4 files changed, 49 insertions(+), 5 deletions(-)

diff --git a/common/Kconfig b/common/Kconfig
index 3030da4fc99..5c59f66f95e 100644
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -285,6 +285,10 @@ config SPL_LOGLEVEL
 	int
 	default LOGLEVEL
 
+config TPL_LOGLEVEL
+	int
+	default LOGLEVEL
+
 config SILENT_CONSOLE
 	bool "Support a silent console"
 	help
@@ -481,6 +485,24 @@ config SPL_LOG_MAX_LEVEL
 	    6 - detail
 	    7 - debug
 
+config TPL_LOG_MAX_LEVEL
+	int "Maximum log level to record in TPL"
+	depends on TPL_LOG
+	default 3
+	help
+	  This selects the maximum log level that will be recorded. Any value
+	  higher than this will be ignored. If possible log statements below
+	  this level will be discarded at build time. Levels:
+
+	    0 - panic
+	    1 - critical
+	    2 - error
+	    3 - warning
+	    4 - note
+	    5 - info
+	    6 - detail
+	    7 - debug
+
 config LOG_CONSOLE
 	bool "Allow log output to the console"
 	depends on LOG
@@ -491,9 +513,19 @@ config LOG_CONSOLE
 	  log message is shown - other details like level, category, file and
 	  line number are omitted.
 
-config LOG_SPL_CONSOLE
+config SPL_LOG_CONSOLE
+	bool "Allow log output to the console in SPL"
+	depends on SPL_LOG
+	default y
+	help
+	  Enables a log driver which writes log records to the console.
+	  Generally the console is the serial port or LCD display. Only the
+	  log message is shown - other details like level, category, file and
+	  line number are omitted.
+
+config TPL_LOG_CONSOLE
 	bool "Allow log output to the console in SPL"
-	depends on LOG_SPL
+	depends on TPL_LOG
 	default y
 	help
 	  Enables a log driver which writes log records to the console.
diff --git a/common/Makefile b/common/Makefile
index 7473b850115..cbca4ff2da6 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -118,8 +118,8 @@ obj-y += cli.o
 obj-$(CONFIG_FSL_DDR_INTERACTIVE) += cli_simple.o cli_readline.o
 obj-$(CONFIG_DFU_OVER_USB) += dfu.o
 obj-y += command.o
-obj-$(CONFIG_$(SPL_)LOG) += log.o
-obj-$(CONFIG_$(SPL_)LOG_CONSOLE) += log_console.o
+obj-$(CONFIG_$(SPL_TPL_)LOG) += log.o
+obj-$(CONFIG_$(SPL_TPL_)LOG_CONSOLE) += log_console.o
 obj-y += s_record.o
 obj-y += xyzModem.o
 
diff --git a/common/spl/spl.c b/common/spl/spl.c
index 19508c71685..933d290c87e 100644
--- a/common/spl/spl.c
+++ b/common/spl/spl.c
@@ -333,6 +333,13 @@ static int spl_common_init(bool setup_malloc)
 		return ret;
 	}
 	bootstage_mark_name(BOOTSTAGE_ID_START_SPL, "spl");
+#if CONFIG_IS_ENABLED(LOG)
+	ret = log_init();
+	if (ret) {
+		debug("%s: Failed to set up logging\n", __func__);
+		return ret;
+	}
+#endif
 	if (CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)) {
 		ret = fdtdec_setup();
 		if (ret) {
diff --git a/include/log.h b/include/log.h
index 75ff1e1160c..1146f423a7a 100644
--- a/include/log.h
+++ b/include/log.h
@@ -92,6 +92,8 @@ int _log(enum log_category_t cat, enum log_level_t level, const char *file,
 #define _LOG_MAX_LEVEL LOGL_INFO
 #endif
 
+#if CONFIG_IS_ENABLED(LOG)
+
 /* Emit a log record if the level is less that the maximum */
 #define log(_cat, _level, _fmt, _args...) ({ \
 	int _l = _level; \
@@ -100,6 +102,9 @@ int _log(enum log_category_t cat, enum log_level_t level, const char *file,
 		      __func__, \
 		      pr_fmt(_fmt), ##_args); \
 	})
+#else
+#define log(_cat, _level, _fmt, _args...)
+#endif
 
 #ifdef DEBUG
 #define _DEBUG	1
@@ -159,7 +164,7 @@ void __assert_fail(const char *assertion, const char *file, unsigned int line,
 	({ if (!(x) && _DEBUG) \
 		__assert_fail(#x, __FILE__, __LINE__, __func__); })
 
-#ifdef CONFIG_LOG_ERROR_RETURN
+#if CONFIG_IS_ENABLED(LOG) && defined(CONFIG_LOG_ERROR_RETURN)
 #define log_ret(_ret) ({ \
 	int __ret = (_ret); \
 	if (__ret < 0) \
-- 
2.19.0.605.g01d371f741-goog