From 8cad489261c564d4ee1db4de4ac365af56807d8a Mon Sep 17 00:00:00 2001
From: Yoshinori Sato <ysato@users.sourceforge.jp>
Date: Sat, 21 Nov 2015 21:42:58 +0900
Subject: [PATCH] h8300: switch EARLYCON

earlyprintk is architecture specific option.
earlycon is generic and small footprint.

Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp>
---
 arch/h8300/configs/h8300h-sim_defconfig |  2 +-
 arch/h8300/kernel/setup.c               |  7 ---
 arch/h8300/kernel/sim-console.c         | 67 ++++---------------------
 3 files changed, 10 insertions(+), 66 deletions(-)

diff --git a/arch/h8300/configs/h8300h-sim_defconfig b/arch/h8300/configs/h8300h-sim_defconfig
index 067bfe9c49b3..80624f46b0ed 100644
--- a/arch/h8300/configs/h8300h-sim_defconfig
+++ b/arch/h8300/configs/h8300h-sim_defconfig
@@ -34,7 +34,7 @@ CONFIG_BINFMT_FLAT=y
 # CONFIG_LEGACY_PTYS is not set
 # CONFIG_DEVKMEM is not set
 CONFIG_SERIAL_SH_SCI=y
-CONFIG_SERIAL_SH_SCI_CONSOLE=y
+CONFIG_SERIAL_SH_SCI_EARLYCON=y
 # CONFIG_HW_RANDOM is not set
 # CONFIG_HWMON is not set
 # CONFIG_USB_SUPPORT is not set
diff --git a/arch/h8300/kernel/setup.c b/arch/h8300/kernel/setup.c
index e4985dfa91dc..c8c25a4e9e48 100644
--- a/arch/h8300/kernel/setup.c
+++ b/arch/h8300/kernel/setup.c
@@ -20,8 +20,6 @@
 #include <linux/bootmem.h>
 #include <linux/seq_file.h>
 #include <linux/init.h>
-#include <linux/platform_device.h>
-#include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_fdt.h>
 #include <linux/of_platform.h>
@@ -137,11 +135,6 @@ void __init setup_arch(char **cmdline_p)
 	parse_early_param();
 
 	bootmem_init();
-#if defined(CONFIG_H8300H_SIM) || defined(CONFIG_H8S_SIM)
-	sim_console_register();
-#endif
-
-	early_platform_driver_probe("earlyprintk", 1, 0);
 	/*
 	 * get kmalloc into gear
 	 */
diff --git a/arch/h8300/kernel/sim-console.c b/arch/h8300/kernel/sim-console.c
index a15edf0565d9..46138f55a9ea 100644
--- a/arch/h8300/kernel/sim-console.c
+++ b/arch/h8300/kernel/sim-console.c
@@ -1,79 +1,30 @@
 /*
- * arch/h8300/kernel/early_printk.c
+ * arch/h8300/kernel/sim-console.c
  *
- *  Copyright (C) 2009 Yoshinori Sato <ysato@users.sourceforge.jp>
+ *  Copyright (C) 2015 Yoshinori Sato <ysato@users.sourceforge.jp>
  *
  * This file is subject to the terms and conditions of the GNU General Public
  * License.  See the file "COPYING" in the main directory of this archive
  * for more details.
  */
 #include <linux/console.h>
-#include <linux/tty.h>
 #include <linux/init.h>
-#include <linux/io.h>
-#include <linux/platform_device.h>
+#include <linux/serial_core.h>
 
-static void sim_write(struct console *co, const char *ptr,
-				 unsigned len)
+static void sim_write(struct console *con, const char *s, unsigned n)
 {
 	register const int fd __asm__("er0") = 1; /* stdout */
-	register const char *_ptr __asm__("er1") = ptr;
-	register const unsigned _len __asm__("er2") = len;
+	register const char *_ptr __asm__("er1") = s;
+	register const unsigned _len __asm__("er2") = n;
 
 	__asm__(".byte 0x5e,0x00,0x00,0xc7\n\t" /* jsr @0xc7 (sys_write) */
 		: : "g"(fd), "g"(_ptr), "g"(_len));
 }
 
-static struct console sim_console = {
-	.name		= "sim_console",
-	.write		= sim_write,
-	.setup		= NULL,
-	.flags		= CON_PRINTBUFFER,
-	.index		= -1,
-};
-
-static char sim_console_buf[32];
-
-static int sim_probe(struct platform_device *pdev)
+static int __init sim_setup(struct earlycon_device *device, const char *opt)
 {
-	if (sim_console.data)
-		return -EEXIST;
-
-	if (!strstr(sim_console_buf, "keep"))
-		sim_console.flags |= CON_BOOT;
-
-	register_console(&sim_console);
+	device->con->write = sim_write;
 	return 0;
 }
 
-static int sim_remove(struct platform_device *pdev)
-{
-	return 0;
-}
-
-static struct platform_driver sim_driver = {
-	.probe		= sim_probe,
-	.remove		= sim_remove,
-	.driver		= {
-		.name	= "h8300-sim",
-		.owner	= THIS_MODULE,
-	},
-};
-
-early_platform_init_buffer("earlyprintk", &sim_driver,
-			   sim_console_buf, ARRAY_SIZE(sim_console_buf));
-
-static struct platform_device sim_console_device = {
-	.name		= "h8300-sim",
-	.id		= 0,
-};
-
-static struct platform_device *devices[] __initdata = {
-	&sim_console_device,
-};
-
-void __init sim_console_register(void)
-{
-	early_platform_add_devices(devices,
-				   ARRAY_SIZE(devices));
-}
+EARLYCON_DECLARE(h8sim, sim_setup);