1 files changed, 189 insertions, 0 deletions

diff --git a/arch/parisc/kernel/pdc_cons.c b/arch/parisc/kernel/pdc_cons.c
new file mode 100644
index 000000000000..01f676d1673b
--- /dev/null
+++ b/arch/parisc/kernel/pdc_cons.c
@@ -0,0 +1,189 @@
+/* 
+ *    PDC Console support - ie use firmware to dump text via boot console
+ *
+ *    Copyright (C) 1999-2003 Matthew Wilcox <willy at parisc-linux.org>
+ *    Copyright (C) 2000 Martin K Petersen <mkp at mkp.net>
+ *    Copyright (C) 2000 John Marvin <jsm at parisc-linux.org>
+ *    Copyright (C) 2000-2003 Paul Bame <bame at parisc-linux.org>
+ *    Copyright (C) 2000 Philipp Rumpf <prumpf with tux.org>
+ *    Copyright (C) 2000 Michael Ang <mang with subcarrier.org>
+ *    Copyright (C) 2000 Grant Grundler <grundler with parisc-linux.org>
+ *    Copyright (C) 2001-2002 Ryan Bradetich <rbrad at parisc-linux.org>
+ *    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>
+ *
+ *
+ *    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
+ */
+
+/*
+ *  The PDC console is a simple console, which can be used for debugging 
+ *  boot related problems on HP PA-RISC machines.
+ *
+ *  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. 
+ * On production kernels EARLY_BOOTUP_DEBUG should be undefined. */
+#undef EARLY_BOOTUP_DEBUG
+
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/console.h>
+#include <linux/string.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include <linux/major.h>
+#include <linux/tty.h>
+#include <asm/page.h>
+#include <asm/types.h>
+#include <asm/system.h>
+#include <asm/pdc.h>            /* for iodc_call() proto and friends */
+
+
+static void pdc_console_write(struct console *co, const char *s, unsigned count)
+{
+        while(count--)
+                pdc_iodc_putc(*s++);
+}
+
+void pdc_outc(unsigned char c)
+{
+        pdc_iodc_outc(c);
+}
+
+void pdc_printf(const char *fmt, ...)
+{
+        va_list args;
+        char buf[1024];
+        int i, len;
+
+        va_start(args, fmt);
+        len = vscnprintf(buf, sizeof(buf), fmt, args);
+        va_end(args);
+
+        for (i = 0; i < len; i++)
+                pdc_iodc_outc(buf[i]);
+}
+
+int pdc_console_poll_key(struct console *co)
+{
+        return pdc_iodc_getc();
+}
+
+static int pdc_console_setup(struct console *co, char *options)
+{
+        return 0;
+}
+
+#if defined(CONFIG_PDC_CONSOLE)
+#define PDC_CONSOLE_DEVICE pdc_console_device
+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;
+}
+#else
+#define PDC_CONSOLE_DEVICE NULL
+#endif
+
+static struct console pdc_cons = {
+        .name =         "ttyB",
+        .write =        pdc_console_write,
+        .device =       PDC_CONSOLE_DEVICE,
+        .setup =        pdc_console_setup,
+        .flags =        CON_BOOT|CON_PRINTBUFFER|CON_ENABLED,
+        .index =        -1,
+};
+
+static int pdc_console_initialized;
+extern unsigned long con_start; /* kernel/printk.c */
+extern unsigned long log_end;   /* kernel/printk.c */
+
+
+static void pdc_console_init_force(void)
+{
+        if (pdc_console_initialized)
+                return;
+        ++pdc_console_initialized;
+        
+        /* If the console is duplex then copy the COUT parameters to CIN. */
+        if (PAGE0->mem_cons.cl_class == CL_DUPLEX)
+                memcpy(&PAGE0->mem_kbd, &PAGE0->mem_cons, sizeof(PAGE0->mem_cons));
+
+        /* register the pdc console */
+        register_console(&pdc_cons);
+}
+
+void __init pdc_console_init(void)
+{
+#if defined(EARLY_BOOTUP_DEBUG) || defined(CONFIG_PDC_CONSOLE)
+        pdc_console_init_force();
+#endif
+#ifdef EARLY_BOOTUP_DEBUG
+        printk(KERN_INFO "Initialized PDC Console for debugging.\n");
+#endif
+}
+
+
+/* Unregister the pdc console with the printk console layer */
+void pdc_console_die(void)
+{
+        if (!pdc_console_initialized)
+                return;
+        --pdc_console_initialized;
+
+        printk(KERN_INFO "Switching from PDC console\n");
+
+        /* Don't repeat what we've already printed */
+        con_start = log_end;
+
+        unregister_console(&pdc_cons);
+}
+
+
+/*
+ * Used for emergencies. Currently only used if an HPMC occurs. If an
+ * HPMC occurs, it is possible that the current console may not be
+ * properly initialed after the PDC IO reset. This routine unregisters all
+ * of the current consoles, reinitializes the pdc console and
+ * registers it.
+ */
+
+void pdc_console_restart(void)
+{
+        struct console *console;
+
+        if (pdc_console_initialized)
+                return;
+
+        while ((console = console_drivers) != NULL)
+                unregister_console(console_drivers);
+
+        /* Don't repeat what we've already printed */
+        con_start = log_end;
+        
+        /* force registering the pdc console */
+        pdc_console_init_force();
+}
+