linux-kernel - [PATCH] hvc: dcc: Add earlycon support

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Message-Id: <41e2920a6348e65b2e986b0e65b66531e87cd756.1570543923.git.michal.simek@xilinx.com>
Date:   Tue,  8 Oct 2019 16:12:06 +0200
From:   Michal Simek <michal.simek@...inx.com>
To:     linux-kernel@...r.kernel.org, monstr@...str.eu,
        michal.simek@...inx.com, git@...inx.com
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH] hvc: dcc: Add earlycon support

Add DCC earlycon support for early printks. The patch is useful for SoC
bringup where HW serial console is broken.

Signed-off-by: Michal Simek <michal.simek@...inx.com>
---

I have this patch in Xilinx tree for quite a long time and it was develop
as preparation work for SoC bringup where jtag is functional and get
information from kernel what's going on.

There is one checkpatch warning
WARNING: Prefer 'unsigned int' to bare use of 'unsigned'
+static void dcc_early_write(struct console *con, const char *s, unsigned n)
but
console write is defined like that.
include/linux/console.h  +145
void    (*write)(struct console *, const char *, unsigned);
---
 drivers/tty/hvc/hvc_dcc.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/drivers/tty/hvc/hvc_dcc.c b/drivers/tty/hvc/hvc_dcc.c
index 02629a1f193d..8e0edb7d93fd 100644
--- a/drivers/tty/hvc/hvc_dcc.c
+++ b/drivers/tty/hvc/hvc_dcc.c
@@ -1,7 +1,10 @@
 // SPDX-License-Identifier: GPL-2.0
 /* Copyright (c) 2010, 2014 The Linux Foundation. All rights reserved.  */
 
+#include <linux/console.h>
 #include <linux/init.h>
+#include <linux/serial.h>
+#include <linux/serial_core.h>
 
 #include <asm/dcc.h>
 #include <asm/processor.h>
@@ -12,6 +15,31 @@
 #define DCC_STATUS_RX		(1 << 30)
 #define DCC_STATUS_TX		(1 << 29)
 
+static void dcc_uart_console_putchar(struct uart_port *port, int ch)
+{
+	while (__dcc_getstatus() & DCC_STATUS_TX)
+		cpu_relax();
+
+	__dcc_putchar(ch);
+}
+
+static void dcc_early_write(struct console *con, const char *s, unsigned n)
+{
+	struct earlycon_device *dev = con->data;
+
+	uart_console_write(&dev->port, s, n, dcc_uart_console_putchar);
+}
+
+static int __init dcc_early_console_setup(struct earlycon_device *device,
+					  const char *opt)
+{
+	device->con->write = dcc_early_write;
+
+	return 0;
+}
+
+EARLYCON_DECLARE(dcc, dcc_early_console_setup);
+
 static int hvc_dcc_put_chars(uint32_t vt, const char *buf, int count)
 {
 	int i;
-- 
2.17.1