1 files changed, 134 insertions, 7 deletions

diff --git a/arch/parisc/kernel/pdc_cons.c b/arch/parisc/kernel/pdc_cons.c
index 1ff366cb9685..66d1f17fdb94 100644
--- a/arch/parisc/kernel/pdc_cons.c
+++ b/arch/parisc/kernel/pdc_cons.c
@@ -12,6 +12,7 @@
  *    Copyright (C) 2001 Helge Deller <deller at parisc-linux.org>
  *    Copyright (C) 2001 Thomas Bogendoerfer <tsbogend at parisc-linux.org>
  *    Copyright (C) 2002 Randolph Chung <tausq with parisc-linux.org>
+ *    Copyright (C) 2010 Guy Martin <gmsoft at tuxicoman.be>
  *
  *
  *    This program is free software; you can redistribute it and/or modify
@@ -31,12 +32,11 @@
 
 /*
  *  The PDC console is a simple console, which can be used for debugging 
- *  boot related problems on HP PA-RISC machines.
+ *  boot related problems on HP PA-RISC machines. It is also useful when no
+ *  other console works.
  *
  *  This code uses the ROM (=PDC) based functions to read and write characters
  *  from and to PDC's boot path.
- *  Since all character read from that path must be polled, this code never
- *  can or will be a fully functional linux console.
  */
 
 /* Define EARLY_BOOTUP_DEBUG to debug kernel related boot problems. 
@@ -53,6 +53,7 @@
 #include <asm/pdc.h>            /* for iodc_call() proto and friends */
 
 static DEFINE_SPINLOCK(pdc_console_lock);
+static struct console pdc_cons;
 
 static void pdc_console_write(struct console *co, const char *s, unsigned count)
 {
@@ -85,12 +86,138 @@ static int pdc_console_setup(struct console *co, char *options)
 
 #if defined(CONFIG_PDC_CONSOLE)
 #include <linux/vt_kern.h>
+#include <linux/tty_flip.h>
+
+#define PDC_CONS_POLL_DELAY (30 * HZ / 1000)
+
+static struct timer_list pdc_console_timer;
+
+extern struct console * console_drivers;
+
+static int pdc_console_tty_open(struct tty_struct *tty, struct file *filp)
+{
+
+        mod_timer(&pdc_console_timer, jiffies + PDC_CONS_POLL_DELAY);
+
+        return 0;
+}
+
+static void pdc_console_tty_close(struct tty_struct *tty, struct file *filp)
+{
+        if (!tty->count)
+                del_timer(&pdc_console_timer);
+}
+
+static int pdc_console_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
+{
+        pdc_console_write(NULL, buf, count);
+        return count;
+}
+
+static int pdc_console_tty_write_room(struct tty_struct *tty)
+{
+        return 32768; /* no limit, no buffer used */
+}
+
+static int pdc_console_tty_chars_in_buffer(struct tty_struct *tty)
+{
+        return 0; /* no buffer */
+}
+
+static struct tty_driver *pdc_console_tty_driver;
+
+static const struct tty_operations pdc_console_tty_ops = {
+        .open = pdc_console_tty_open,
+        .close = pdc_console_tty_close,
+        .write = pdc_console_tty_write,
+        .write_room = pdc_console_tty_write_room,
+        .chars_in_buffer = pdc_console_tty_chars_in_buffer,
+};
+
+static void pdc_console_poll(unsigned long unused)
+{
+
+        int data, count = 0;
+
+        struct tty_struct *tty = pdc_console_tty_driver->ttys[0];
+
+        if (!tty)
+                return;
+
+        while (1) {
+                data = pdc_console_poll_key(NULL);
+                if (data == -1)
+                        break;
+                tty_insert_flip_char(tty, data & 0xFF, TTY_NORMAL);
+                count ++;
+        }
+
+        if (count)
+                tty_flip_buffer_push(tty);
+
+        if (tty->count && (pdc_cons.flags & CON_ENABLED))
+                mod_timer(&pdc_console_timer, jiffies + PDC_CONS_POLL_DELAY);
+}
+
+static int __init pdc_console_tty_driver_init(void)
+{
+
+        int err;
+        struct tty_driver *drv;
+
+        /* Check if the console driver is still registered.
+         * It is unregistered if the pdc console was not selected as the
+         * primary console. */
+
+        struct console *tmp = console_drivers;
+
+        for (tmp = console_drivers; tmp; tmp = tmp->next)
+                if (tmp == &pdc_cons)
+                        break;
+
+        if (!tmp) {
+                printk(KERN_INFO "PDC console driver not registered anymore, not creating %s\n", pdc_cons.name);
+                return -ENODEV;
+        }
+
+        printk(KERN_INFO "The PDC console driver is still registered, removing CON_BOOT flag\n");
+        pdc_cons.flags &= ~CON_BOOT;
+
+        drv = alloc_tty_driver(1);
+
+        if (!drv)
+                return -ENOMEM;
+
+        drv->driver_name = "pdc_cons";
+        drv->name = "ttyB";
+        drv->major = MUX_MAJOR;
+        drv->minor_start = 0;
+        drv->type = TTY_DRIVER_TYPE_SYSTEM;
+        drv->init_termios = tty_std_termios;
+        drv->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
+        tty_set_operations(drv, &pdc_console_tty_ops);
+
+        err = tty_register_driver(drv);
+        if (err) {
+                printk(KERN_ERR "Unable to register the PDC console TTY driver\n");
+                return err;
+        }
+
+        pdc_console_tty_driver = drv;
+
+        /* No need to initialize the pdc_console_timer if tty isn't allocated */
+        init_timer(&pdc_console_timer);
+        pdc_console_timer.function = pdc_console_poll;
+
+        return 0;
+}
+
+module_init(pdc_console_tty_driver_init);
 
 static struct tty_driver * pdc_console_device (struct console *c, int *index)
 {
-        extern struct tty_driver console_driver;
-        *index = c->index ? c->index-1 : fg_console;
-        return &console_driver;
+        *index = c->index;
+        return pdc_console_tty_driver;
 }
 #else
 #define pdc_console_device NULL
@@ -101,7 +228,7 @@ static struct console pdc_cons = {
         .write =        pdc_console_write,
         .device =       pdc_console_device,
         .setup =        pdc_console_setup,
-        .flags =        CON_BOOT | CON_PRINTBUFFER | CON_ENABLED,
+        .flags =        CON_BOOT | CON_PRINTBUFFER,
         .index =        -1,
 };