linux-kernel - [RFC PATCH 1/8] cris: Add support for early console

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Date:	Sun, 21 Sep 2014 09:27:11 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	linux-kernel@...r.kernel.org
Cc:	Waldemar Brodkorb <mail@...demar-brodkorb.de>,
	Jesper Nilsson <jespern@...s.com>,
	Mikael Starvik <starvik@...s.com>, linux-cris-kernel@...s.com,
	Guenter Roeck <linux@...ck-us.net>
Subject: [RFC PATCH 1/8] cris: Add support for early console

Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
 arch/cris/arch-v32/kernel/debugport.c | 41 +++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/arch/cris/arch-v32/kernel/debugport.c b/arch/cris/arch-v32/kernel/debugport.c
index 610909b..7e46d87 100644
--- a/arch/cris/arch-v32/kernel/debugport.c
+++ b/arch/cris/arch-v32/kernel/debugport.c
@@ -4,6 +4,7 @@
 
 #include <linux/console.h>
 #include <linux/init.h>
+
 #include <hwregs/reg_rdwr.h>
 #include <hwregs/reg_map.h>
 #include <hwregs/ser_defs.h>
@@ -190,12 +191,52 @@ putDebugChar(int val)
 }
 #endif /* CONFIG_ETRAX_KGDB */
 
+static void __init early_putch(int c)
+{
+	reg_ser_r_stat_din stat;
+	/* Wait until transmitter is ready and send. */
+	do
+		stat = REG_RD(ser, port->instance, r_stat_din);
+	while (!stat.tr_rdy);
+	REG_WR_INT(ser, port->instance, rw_dout, c);
+}
+
+static void __init
+early_console_write(struct console *con, const char *s, unsigned n)
+{
+	extern void reset_watchdog(void);
+	int i;
+
+	/* Send data. */
+	for (i = 0; i < n; i++) {
+		/*
+		 * TODO: the '\n' -> '\n\r' translation should be done at the
+		 * receiver. Remove it when the serial driver removes it.
+		 */
+		if (s[i] == '\n')
+			early_putch('\r');
+		early_putch(s[i]);
+		reset_watchdog();
+	}
+}
+
+static struct console early_console_dev __initdata = {
+	.name	= "early",
+	.write	= early_console_write,
+	.flags	= CON_PRINTBUFFER | CON_BOOT,
+	.index	= -1
+};
+
 /* Register console for printk's, etc. */
 int __init
 init_etrax_debug(void)
 {
         start_port(port);
 
+	/* Register an early console if a debug port was chosen */
+	if (port)
+		register_console(&early_console_dev);
+
 #ifdef CONFIG_ETRAX_KGDB
 	start_port(kgdb_port);
 #endif /* CONFIG_ETRAX_KGDB */
-- 
1.9.1

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