[PATCH 10/30] leon, apbuart: Inherit HW parameters on sysconsole

[Daniel Hellstrom]

From: Martin Aberg <maberg at gaisler.com>

The cons layer decides which of the registered console device is granted as
system console. When a device specific console driver performs its first_open,
it inherits UART parameters from boot loader only if it is the system console.
---
 c/src/lib/libbsp/sparc/shared/include/cons.h      |  8 +++++---
 c/src/lib/libbsp/sparc/shared/uart/apbuart_cons.c | 10 ++++++----
 c/src/lib/libbsp/sparc/shared/uart/cons.c         |  4 ++++
 3 files changed, 15 insertions(+), 7 deletions(-)

diff --git a/c/src/lib/libbsp/sparc/shared/include/cons.h b/c/src/lib/libbsp/sparc/shared/include/cons.h
index 9a26a26..c30e41c 100644
--- a/c/src/lib/libbsp/sparc/shared/include/cons.h
+++ b/c/src/lib/libbsp/sparc/shared/include/cons.h
@@ -20,12 +20,14 @@
 
 struct console_dev;
 
-#define CONSOLE_FLAG_SYSCON      0x01
+#define CONSOLE_FLAG_SYSCON             0x01
+#define CONSOLE_FLAG_SYSCON_GRANT       0x02
 
 struct console_dev {
 	rtems_termios_device_context base;
-	/* Set to CONSOLE_FLAG_SYSCON if this UART should be system console and/or
-	 * debug console.
+	/* Set CONSOLE_FLAG_SYSCON to request this device to be system console
+	 * and/or debug console. CONSOLE_FLAG_SYSCON_GRANT will be set on the
+	 * device which was selected as system console.
 	 */
 	int flags;
 	char *fsname; /* File system prefix */
diff --git a/c/src/lib/libbsp/sparc/shared/uart/apbuart_cons.c b/c/src/lib/libbsp/sparc/shared/uart/apbuart_cons.c
index 1547e78..379d9ff 100644
--- a/c/src/lib/libbsp/sparc/shared/uart/apbuart_cons.c
+++ b/c/src/lib/libbsp/sparc/shared/uart/apbuart_cons.c
@@ -440,10 +440,12 @@ static bool first_open(
 
 	uart->tty = tty;
 
-	/* Preserve values set by bootloader */
-	get_attributes(base, term);
-	term->c_oflag |= ONLCR;
-	set_attributes(base, term);
+	/* Inherit UART hardware parameters from bootloader on system console */
+	if (uart->condev.flags & CONSOLE_FLAG_SYSCON_GRANT) {
+		get_attributes(base, term);
+		term->c_oflag |= ONLCR;
+		set_attributes(base, term);
+	}
 
 	/* Enable TX/RX */
 	uart->regs->ctrl |= APBUART_CTRL_RE | APBUART_CTRL_TE;
diff --git a/c/src/lib/libbsp/sparc/shared/uart/cons.c b/c/src/lib/libbsp/sparc/shared/uart/cons.c
index 8426add..37f448c 100644
--- a/c/src/lib/libbsp/sparc/shared/uart/cons.c
+++ b/c/src/lib/libbsp/sparc/shared/uart/cons.c
@@ -89,6 +89,10 @@ void console_dev_register(struct console_dev *dev)
 		/* Not enough console structures */
 		return;
 	}
+	dev->flags &= ~CONSOLE_FLAG_SYSCON_GRANT;
+	if (con->flags & FLAG_SYSCON) {
+		dev->flags |= CONSOLE_FLAG_SYSCON_GRANT;
+	}
 
 	/* Assign Console */
 	con->dev = dev;
-- 
2.7.4