[PATCH] hvc_console: Separate hvc_console and vio code 2

Remove all the vio device driver code from hvc_console.c

This will allow us to separate hvsi, hvc, and allow hvc_console to be used
without the ppc64 vio layer.

Signed-off-by: Milton Miller <miltonm@bga.com>
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

5 files changed, 145 insertions, 74 deletions

diff --git a/arch/ppc64/kernel/hvconsole.c b/arch/ppc64/kernel/hvconsole.c
index 94fb06198ea2..9d8876d92eb9 100644
--- a/arch/ppc64/kernel/hvconsole.c
+++ b/arch/ppc64/kernel/hvconsole.c
@@ -27,7 +27,6 @@
 #include <linux/module.h>
 #include <asm/hvcall.h>
 #include <asm/hvconsole.h>
-#include <asm/prom.h>
 
 /**
  * hvc_get_chars - retrieve characters from firmware for denoted vterm adatper
@@ -88,35 +87,3 @@ int hvc_put_chars(uint32_t vtermno, const char *buf, int count)
 }
 
 EXPORT_SYMBOL(hvc_put_chars);
-
-/*
- * We hope/assume that the first vty found corresponds to the first console
- * device.
- */
-static int hvc_find_vtys(void)
-{
-	struct device_node *vty;
-	int num_found = 0;
-
-	for (vty = of_find_node_by_name(NULL, "vty"); vty != NULL;
-			vty = of_find_node_by_name(vty, "vty")) {
-		uint32_t *vtermno;
-
-		/* We have statically defined space for only a certain number of
-		 * console adapters. */
-		if (num_found >= MAX_NR_HVC_CONSOLES)
-			break;
-
-		vtermno = (uint32_t *)get_property(vty, "reg", NULL);
-		if (!vtermno)
-			continue;
-
-		if (device_is_compatible(vty, "hvterm1")) {
-			hvc_instantiate(*vtermno, num_found);
-			++num_found;
-		}
-	}
-
-	return num_found;
-}
-console_initcall(hvc_find_vtys);
diff --git a/drivers/char/Makefile b/drivers/char/Makefile
index 1aff819f3832..08f69287ea36 100644
--- a/drivers/char/Makefile
+++ b/drivers/char/Makefile
@@ -40,7 +40,7 @@ obj-$(CONFIG_N_HDLC)		+= n_hdlc.o
 obj-$(CONFIG_AMIGA_BUILTIN_SERIAL) += amiserial.o
 obj-$(CONFIG_SX)		+= sx.o generic_serial.o
 obj-$(CONFIG_RIO)		+= rio/ generic_serial.o
-obj-$(CONFIG_HVC_CONSOLE)	+= hvc_console.o hvsi.o
+obj-$(CONFIG_HVC_CONSOLE)	+= hvc_console.o hvc_vio.o hvsi.o
 obj-$(CONFIG_RAW_DRIVER)	+= raw.o
 obj-$(CONFIG_SGI_SNSC)		+= snsc.o snsc_event.o
 obj-$(CONFIG_MMTIMER)		+= mmtimer.o
diff --git a/drivers/char/hvc_console.c b/drivers/char/hvc_console.c
index d59c642f9654..df282cc9a7ab 100644
--- a/drivers/char/hvc_console.c
+++ b/drivers/char/hvc_console.c
@@ -41,7 +41,6 @@
 #include <linux/delay.h>
 #include <asm/uaccess.h>
 #include <asm/hvconsole.h>
-#include <asm/vio.h>
 
 #define HVC_MAJOR	229
 #define HVC_MINOR	0
@@ -90,7 +89,6 @@ struct hvc_struct {
 	int irq;
 	struct list_head next;
 	struct kobject kobj; /* ref count & hvc_struct lifetime */
-	struct vio_dev *vdev;
 };
 
 /* dynamic list of hvc_struct instances */
@@ -279,6 +277,7 @@ int hvc_instantiate(uint32_t vtermno, int index)
 
 	return 0;
 }
+EXPORT_SYMBOL(hvc_instantiate);
 
 /* Wake the sleeping khvcd */
 static void hvc_kick(void)
@@ -738,26 +737,19 @@ static struct kobj_type hvc_kobj_type = {
 	.release = destroy_hvc_struct,
 };
 
-static int __devinit hvc_probe(
-		struct vio_dev *dev,
-		const struct vio_device_id *id)
+struct hvc_struct __devinit *hvc_alloc(uint32_t vtermno, int irq)
 {
 	struct hvc_struct *hp;
 	int i;
 
-	/* probed with invalid parameters. */
-	if (!dev || !id)
-		return -EPERM;
-
 	hp = kmalloc(sizeof(*hp), GFP_KERNEL);
 	if (!hp)
-		return -ENOMEM;
+		return ERR_PTR(-ENOMEM);
 
 	memset(hp, 0x00, sizeof(*hp));
-	hp->vtermno = dev->unit_address;
-	hp->vdev = dev;
-	hp->vdev->dev.driver_data = hp;
-	hp->irq = dev->irq;
+
+	hp->vtermno = vtermno;
+	hp->irq = irq;
 
 	kobject_init(&hp->kobj);
 	hp->kobj.ktype = &hvc_kobj_type;
@@ -782,12 +774,12 @@ static int __devinit hvc_probe(
 	list_add_tail(&(hp->next), &hvc_structs);
 	spin_unlock(&hvc_structs_lock);
 
-	return 0;
+	return hp;
 }
+EXPORT_SYMBOL(hvc_alloc);
 
-static int __devexit hvc_remove(struct vio_dev *dev)
+int __devexit hvc_remove(struct hvc_struct *hp)
 {
-	struct hvc_struct *hp = dev->dev.driver_data;
 	unsigned long flags;
 	struct kobject *kobjp;
 	struct tty_struct *tty;
@@ -820,28 +812,12 @@ static int __devexit hvc_remove(struct vio_dev *dev)
 		tty_hangup(tty);
 	return 0;
 }
-
-char hvc_driver_name[] = "hvc_console";
-
-static struct vio_device_id hvc_driver_table[] __devinitdata= {
-	{"serial", "hvterm1"},
-	{ NULL, }
-};
-MODULE_DEVICE_TABLE(vio, hvc_driver_table);
-
-static struct vio_driver hvc_vio_driver = {
-	.name		= hvc_driver_name,
-	.id_table	= hvc_driver_table,
-	.probe		= hvc_probe,
-	.remove		= hvc_remove,
-};
+EXPORT_SYMBOL(hvc_remove);
 
 /* Driver initialization.  Follow console initialization.  This is where the TTY
  * interfaces start to become available. */
 int __init hvc_init(void)
 {
-	int rc;
-
 	/* We need more than hvc_count adapters due to hotplug additions. */
 	hvc_driver = alloc_tty_driver(HVC_ALLOC_TTY_ADAPTERS);
 	if (!hvc_driver)
@@ -870,10 +846,7 @@ int __init hvc_init(void)
 		return -EIO;
 	}
 
-	/* Register as a vio device to receive callbacks */
-	rc = vio_register_driver(&hvc_vio_driver);
-
-	return rc;
+	return 0;
 }
 module_init(hvc_init);
 
@@ -884,7 +857,6 @@ static void __exit hvc_exit(void)
 {
 	kthread_stop(hvc_task);
 
-	vio_unregister_driver(&hvc_vio_driver);
 	tty_unregister_driver(hvc_driver);
 	/* return tty_struct instances allocated in hvc_init(). */
 	put_tty_driver(hvc_driver);
diff --git a/drivers/char/hvc_vio.c b/drivers/char/hvc_vio.c
new file mode 100644
index 000000000000..d2928f90ab51
--- /dev/null
+++ b/drivers/char/hvc_vio.c
@@ -0,0 +1,125 @@
+/*
+ * vio driver interface to hvc_console.c
+ *
+ * This code was moved here to allow the remaing code to be reused as a
+ * generic polling mode with semi-reliable transport driver core to the
+ * console and tty subsystems.
+ *
+ *
+ * Copyright (C) 2001 Anton Blanchard <anton@au.ibm.com>, IBM
+ * Copyright (C) 2001 Paul Mackerras <paulus@au.ibm.com>, IBM
+ * Copyright (C) 2004 Benjamin Herrenschmidt <benh@kernel.crashing.org>, IBM Corp.
+ * Copyright (C) 2004 IBM Corporation
+ *
+ * Additional Author(s):
+ *  Ryan S. Arnold <rsa@us.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ */
+
+#include <linux/types.h>
+#include <linux/init.h>
+#include <asm/hvconsole.h>
+#include <asm/vio.h>
+#include <asm/prom.h>
+
+char hvc_driver_name[] = "hvc_console";
+
+static struct vio_device_id hvc_driver_table[] __devinitdata = {
+	{"serial", "hvterm1"},
+	{ NULL, }
+};
+MODULE_DEVICE_TABLE(vio, hvc_driver_table);
+
+static int __devinit hvc_vio_probe(struct vio_dev *vdev,
+				const struct vio_device_id *id)
+{
+	struct hvc_struct *hp;
+
+	/* probed with invalid parameters. */
+	if (!vdev || !id)
+		return -EPERM;
+
+	hp = hvc_alloc(vdev->unit_address, vdev->irq);
+	if (IS_ERR(hp))
+		return PTR_ERR(hp);
+	dev_set_drvdata(&vdev->dev, hp);
+
+	return 0;
+}
+
+static int __devexit hvc_vio_remove(struct vio_dev *vdev)
+{
+	struct hvc_struct *hp = dev_get_drvdata(&vdev->dev);
+
+	return hvc_remove(hp);
+}
+
+static struct vio_driver hvc_vio_driver = {
+	.name		= hvc_driver_name,
+	.id_table	= hvc_driver_table,
+	.probe		= hvc_vio_probe,
+	.remove		= hvc_vio_remove,
+	.driver		= {
+		.owner	= THIS_MODULE,
+	}
+};
+
+static int hvc_vio_init(void)
+{
+	int rc;
+
+	/* Register as a vio device to receive callbacks */
+	rc = vio_register_driver(&hvc_vio_driver);
+
+	return rc;
+}
+module_init(hvc_vio_init); /* after drivers/char/hvc_console.c */
+
+static void hvc_vio_exit(void)
+{
+	vio_unregister_driver(&hvc_vio_driver);
+}
+module_exit(hvc_vio_exit);
+
+/* the device tree order defines our numbering */
+static int hvc_find_vtys(void)
+{
+	struct device_node *vty;
+	int num_found = 0;
+
+	for (vty = of_find_node_by_name(NULL, "vty"); vty != NULL;
+			vty = of_find_node_by_name(vty, "vty")) {
+		uint32_t *vtermno;
+
+		/* We have statically defined space for only a certain number
+		 * of console adapters.
+		 */
+		if (num_found >= MAX_NR_HVC_CONSOLES)
+			break;
+
+		vtermno = (uint32_t *)get_property(vty, "reg", NULL);
+		if (!vtermno)
+			continue;
+
+		if (device_is_compatible(vty, "hvterm1")) {
+			hvc_instantiate(*vtermno, num_found);
+			++num_found;
+		}
+	}
+
+	return num_found;
+}
+console_initcall(hvc_find_vtys);
diff --git a/include/asm-ppc64/hvconsole.h b/include/asm-ppc64/hvconsole.h
index 91c2414ac00b..14667a78716d 100644
--- a/include/asm-ppc64/hvconsole.h
+++ b/include/asm-ppc64/hvconsole.h
@@ -29,9 +29,16 @@
  */
 #define MAX_NR_HVC_CONSOLES	16
 
+/* implemented by a low level driver */
 extern int hvc_get_chars(uint32_t vtermno, char *buf, int count);
 extern int hvc_put_chars(uint32_t vtermno, const char *buf, int count);
 
-/* Register a vterm and a slot index for use as a console */
+struct hvc_struct;
+
+/* Register a vterm and a slot index for use as a console (console_init) */
 extern int hvc_instantiate(uint32_t vtermno, int index);
+/* register a vterm for hvc tty operation (module_init or hotplug add) */
+extern struct hvc_struct * __devinit hvc_alloc(uint32_t vtermno, int irq);
+/* remove a vterm from hvc tty operation (modele_exit or hotplug remove) */
+extern int __devexit hvc_remove(struct hvc_struct *hp);
 #endif /* _PPC64_HVCONSOLE_H */