1 files changed, 173 insertions, 0 deletions

diff --git a/drivers/tty/hvc/hvc_vio.c b/drivers/tty/hvc/hvc_vio.c
new file mode 100644
index 000000000000..5e2f52b33327
--- /dev/null
+++ b/drivers/tty/hvc/hvc_vio.c
@@ -0,0 +1,173 @@
+/*
+ * 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>
+#include <asm/firmware.h>
+
+#include "hvc_console.h"
+
+static const char hvc_driver_name[] = "hvc_console";
+
+static struct vio_device_id hvc_driver_table[] __devinitdata = {
+        {"serial", "hvterm1"},
+        { "", "" }
+};
+MODULE_DEVICE_TABLE(vio, hvc_driver_table);
+
+static int filtered_get_chars(uint32_t vtermno, char *buf, int count)
+{
+        unsigned long got;
+        int i;
+
+        /*
+         * Vio firmware will read up to SIZE_VIO_GET_CHARS at its own discretion
+         * so we play safe and avoid the situation where got > count which could
+         * overload the flip buffer.
+         */
+        if (count < SIZE_VIO_GET_CHARS)
+                return -EAGAIN;
+
+        got = hvc_get_chars(vtermno, buf, count);
+
+        /*
+         * Work around a HV bug where it gives us a null
+         * after every \r.  -- paulus
+         */
+        for (i = 1; i < got; ++i) {
+                if (buf[i] == 0 && buf[i-1] == '\r') {
+                        --got;
+                        if (i < got)
+                                memmove(&buf[i], &buf[i+1],
+                                        got - i);
+                }
+        }
+        return got;
+}
+
+static const struct hv_ops hvc_get_put_ops = {
+        .get_chars = filtered_get_chars,
+        .put_chars = hvc_put_chars,
+        .notifier_add = notifier_add_irq,
+        .notifier_del = notifier_del_irq,
+        .notifier_hangup = notifier_hangup_irq,
+};
+
+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, &hvc_get_put_ops,
+                        MAX_VIO_PUT_CHARS);
+        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 = {
+        .id_table       = hvc_driver_table,
+        .probe          = hvc_vio_probe,
+        .remove         = __devexit_p(hvc_vio_remove),
+        .driver         = {
+                .name   = hvc_driver_name,
+                .owner  = THIS_MODULE,
+        }
+};
+
+static int __init hvc_vio_init(void)
+{
+        int rc;
+
+        if (firmware_has_feature(FW_FEATURE_ISERIES))
+                return -EIO;
+
+        /* 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 __exit 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")) {
+                const uint32_t *vtermno;
+
+                /* We have statically defined space for only a certain number
+                 * of console adapters.
+                 */
+                if (num_found >= MAX_NR_HVC_CONSOLES) {
+                        of_node_put(vty);
+                        break;
+                }
+
+                vtermno = of_get_property(vty, "reg", NULL);
+                if (!vtermno)
+                        continue;
+
+                if (of_device_is_compatible(vty, "hvterm1")) {
+                        hvc_instantiate(*vtermno, num_found, &hvc_get_put_ops);
+                        ++num_found;
+                }
+        }
+
+        return num_found;
+}
+console_initcall(hvc_find_vtys);