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.si...@xilinx.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
