[MIPS] RM: Collected changes

- EISA support for non PCI RMs (RM200 and RM400-xxx). The major part
  is the splitting of the EISA and onboard ISA of the RM200, which
  makes the EISA bus on the RM200 look like on other RMs.
- 64bit kernel support
- system type detection is now common for big and little endian
- moved sniprom code to arch/mips/fw
- added call_o32 function to arch/mips/fw/lib, which uses a private
  stack for calling prom functions
- fix problem with ISA interrupts, which makes using PIT clockevent
  possible

Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/sni/eisa.c

@@ -0,0 +1,50 @@
+/*
+ * Virtual EISA root driver.
+ * Acts as a placeholder if we don't have a proper EISA bridge.
+ *
+ * (C) 2003 Marc Zyngier <maz@wild-wind.fr.eu.org>
+ * modified for SNI usage by Thomas Bogendoerfer
+ *
+ * This code is released under the GPL version 2.
+ */
+
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/eisa.h>
+#include <linux/init.h>
+
+/* The default EISA device parent (virtual root device).
+ * Now use a platform device, since that's the obvious choice. */
+
+static struct platform_device eisa_root_dev = {
+	.name = "eisa",
+	.id   = 0,
+};
+
+static struct eisa_root_device eisa_bus_root = {
+	.dev           = &eisa_root_dev.dev,
+	.bus_base_addr = 0,
+	.res	       = &ioport_resource,
+	.slots	       = EISA_MAX_SLOTS,
+	.dma_mask      = 0xffffffff,
+	.force_probe   = 1,
+};
+
+int __init sni_eisa_root_init(void)
+{
+	int r;
+
+	r = platform_device_register(&eisa_root_dev);
+	if (!r)
+		return r;
+
+	eisa_root_dev.dev.driver_data = &eisa_bus_root;
+
+	if (eisa_root_register(&eisa_bus_root)) {
+		/* A real bridge may have been registered before
+		 * us. So quietly unregister. */
+		platform_device_unregister(&eisa_root_dev);
+		return -1;
+	}
+	return 0;
+}