test: serial: Add test for putc/puts

This adds a test to ensure that puts is equivalent to putc called in a
loop. We don't verify the contents of the message to avoid having to
record console output a second time (though that could be added in the
future). The globals are initialized to non-zero values to avoid a
warning; in particular, the character count is off-by-one (but we always
make relative measurements).

Signed-off-by: Sean Anderson <sean.anderson@seco.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

1 files changed, 22 insertions, 0 deletions

diff --git a/arch/sandbox/include/asm/serial.h b/arch/sandbox/include/asm/serial.h
index bc82aebd0e..16589a1b21 100644
--- a/arch/sandbox/include/asm/serial.h
+++ b/arch/sandbox/include/asm/serial.h
@@ -17,6 +17,28 @@ struct sandbox_serial_plat {
 };
 
 /**
+ * sandbox_serial_written() - Get the total number of characters written
+ *
+ * This returns the number of characters written by the sandbox serial
+ * device. It is intended for performing tests of the serial subsystem
+ * where a console buffer cannot be used. The absolute number should not be
+ * relied upon; call this function twice and compare the difference.
+ *
+ * Return: The number of characters written
+ */
+size_t sandbox_serial_written(void);
+
+/**
+ * sandbox_serial_endisable() - Enable or disable serial output
+ * @enabled: Whether serial output should be enabled or not
+ *
+ * This allows tests to enable or disable the sandbox serial output. All
+ * processes relating to writing output (except the actual writing) will be
+ * performed.
+ */
+void sandbox_serial_endisable(bool enabled);
+
+/**
  * struct sandbox_serial_priv - Private data for this driver
  *
  * @buf: holds input characters available to be read by this driver