m68k/atari: ARAnyM - Add support for console access

[geert: Cleanups and updates]

Signed-off-by: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Petr Stehlik <pstehlik@sophics.cz>

1 files changed, 162 insertions, 0 deletions

diff --git a/arch/m68k/emu/nfcon.c b/arch/m68k/emu/nfcon.c
new file mode 100644
index 00000000000..ab20dc0ff63
--- /dev/null
+++ b/arch/m68k/emu/nfcon.c
@@ -0,0 +1,162 @@
+/*
+ * ARAnyM console driver
+ *
+ * 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/module.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/tty.h>
+#include <linux/tty_driver.h>
+#include <linux/tty_flip.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/uaccess.h>
+
+#include <asm/natfeat.h>
+
+static int stderr_id;
+static struct tty_driver *nfcon_tty_driver;
+
+static void nfputs(const char *str, unsigned int count)
+{
+	char buf[68];
+
+	buf[64] = 0;
+	while (count > 64) {
+		memcpy(buf, str, 64);
+		nf_call(stderr_id, buf);
+		str += 64;
+		count -= 64;
+	}
+	memcpy(buf, str, count);
+	buf[count] = 0;
+	nf_call(stderr_id, buf);
+}
+
+static void nfcon_write(struct console *con, const char *str,
+			unsigned int count)
+{
+	nfputs(str, count);
+}
+
+static struct tty_driver *nfcon_device(struct console *con, int *index)
+{
+	*index = 0;
+	return (con->flags & CON_ENABLED) ? nfcon_tty_driver : NULL;
+}
+
+static struct console nf_console = {
+	.name	= "nfcon",
+	.write	= nfcon_write,
+	.device	= nfcon_device,
+	.flags	= CON_PRINTBUFFER,
+	.index	= -1,
+};
+
+
+static int nfcon_tty_open(struct tty_struct *tty, struct file *filp)
+{
+	return 0;
+}
+
+static void nfcon_tty_close(struct tty_struct *tty, struct file *filp)
+{
+}
+
+static int nfcon_tty_write(struct tty_struct *tty, const unsigned char *buf,
+			   int count)
+{
+	nfputs(buf, count);
+	return count;
+}
+
+static int nfcon_tty_put_char(struct tty_struct *tty, unsigned char ch)
+{
+	char temp[2] = { ch, 0 };
+
+	nf_call(stderr_id, temp);
+	return 1;
+}
+
+static int nfcon_tty_write_room(struct tty_struct *tty)
+{
+	return 64;
+}
+
+static const struct tty_operations nfcon_tty_ops = {
+	.open		= nfcon_tty_open,
+	.close		= nfcon_tty_close,
+	.write		= nfcon_tty_write,
+	.put_char	= nfcon_tty_put_char,
+	.write_room	= nfcon_tty_write_room,
+};
+
+#ifndef MODULE
+
+static int __init nf_debug_setup(char *arg)
+{
+	if (strcmp(arg, "nfcon"))
+		return 0;
+
+	stderr_id = nf_get_id("NF_STDERR");
+	if (stderr_id) {
+		nf_console.flags |= CON_ENABLED;
+		register_console(&nf_console);
+	}
+
+	return 0;
+}
+
+early_param("debug", nf_debug_setup);
+
+#endif /* !MODULE */
+
+static int __init nfcon_init(void)
+{
+	int res;
+
+	stderr_id = nf_get_id("NF_STDERR");
+	if (!stderr_id)
+		return -ENODEV;
+
+	nfcon_tty_driver = alloc_tty_driver(1);
+	if (!nfcon_tty_driver)
+		return -ENOMEM;
+
+	nfcon_tty_driver->owner = THIS_MODULE;
+	nfcon_tty_driver->driver_name = "nfcon";
+	nfcon_tty_driver->name = "nfcon";
+	nfcon_tty_driver->type = TTY_DRIVER_TYPE_SYSTEM;
+	nfcon_tty_driver->subtype = SYSTEM_TYPE_TTY;
+	nfcon_tty_driver->init_termios = tty_std_termios;
+	nfcon_tty_driver->flags = TTY_DRIVER_REAL_RAW;
+
+	tty_set_operations(nfcon_tty_driver, &nfcon_tty_ops);
+	res = tty_register_driver(nfcon_tty_driver);
+	if (res) {
+		pr_err("failed to register nfcon tty driver\n");
+		put_tty_driver(nfcon_tty_driver);
+		return res;
+	}
+
+	if (!(nf_console.flags & CON_ENABLED))
+		register_console(&nf_console);
+
+	return 0;
+}
+
+static void __exit nfcon_exit(void)
+{
+	unregister_console(&nf_console);
+	tty_unregister_driver(nfcon_tty_driver);
+	put_tty_driver(nfcon_tty_driver);
+}
+
+module_init(nfcon_init);
+module_exit(nfcon_exit);
+
+MODULE_LICENSE("GPL");