sparc: prepare kernel/ for unification

o sparc32 files with identical names to sparc64 renamed to <name>_32.S
o introduced a few Kconfig helpers to simplify Makefile logic
o refactored Makefile to prepare for unification
  - use obj-$(CONFIG_SPARC32) for sparc32 specific files
  - use <name>_$(BITS) for files where sparc64 has a _64 variant
  - sparc64 directly include a few files where sparc32 builds them,
    refer to these files directly (no BITS)
  - sneaked in -Werror as used by sparc64
o modified sparc/Makefile to use the new names for head/init_task

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

arch/sparc/kernel/auxio_32.c

@@ -0,0 +1,139 @@
+/* auxio.c: Probing for the Sparc AUXIO register at boot time.
+ *
+ * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
+ */
+
+#include <linux/stddef.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <asm/oplib.h>
+#include <asm/io.h>
+#include <asm/auxio.h>
+#include <asm/string.h>		/* memset(), Linux has no bzero() */
+
+/* Probe and map in the Auxiliary I/O register */
+
+/* auxio_register is not static because it is referenced 
+ * in entry.S::floppy_tdone
+ */
+void __iomem *auxio_register = NULL;
+static DEFINE_SPINLOCK(auxio_lock);
+
+void __init auxio_probe(void)
+{
+	int node, auxio_nd;
+	struct linux_prom_registers auxregs[1];
+	struct resource r;
+
+	switch (sparc_cpu_model) {
+	case sun4d:
+	case sun4:
+		return;
+	default:
+		break;
+	}
+	node = prom_getchild(prom_root_node);
+	auxio_nd = prom_searchsiblings(node, "auxiliary-io");
+	if(!auxio_nd) {
+		node = prom_searchsiblings(node, "obio");
+		node = prom_getchild(node);
+		auxio_nd = prom_searchsiblings(node, "auxio");
+		if(!auxio_nd) {
+#ifdef CONFIG_PCI
+			/* There may be auxio on Ebus */
+			return;
+#else
+			if(prom_searchsiblings(node, "leds")) {
+				/* VME chassis sun4m machine, no auxio exists. */
+				return;
+			}
+			prom_printf("Cannot find auxio node, cannot continue...\n");
+			prom_halt();
+#endif
+		}
+	}
+	if(prom_getproperty(auxio_nd, "reg", (char *) auxregs, sizeof(auxregs)) <= 0)
+		return;
+	prom_apply_obio_ranges(auxregs, 0x1);
+	/* Map the register both read and write */
+	r.flags = auxregs[0].which_io & 0xF;
+	r.start = auxregs[0].phys_addr;
+	r.end = auxregs[0].phys_addr + auxregs[0].reg_size - 1;
+	auxio_register = of_ioremap(&r, 0, auxregs[0].reg_size, "auxio");
+	/* Fix the address on sun4m and sun4c. */
+	if((((unsigned long) auxregs[0].phys_addr) & 3) == 3 ||
+	   sparc_cpu_model == sun4c)
+		auxio_register += (3 - ((unsigned long)auxio_register & 3));
+
+	set_auxio(AUXIO_LED, 0);
+}
+
+unsigned char get_auxio(void)
+{
+	if(auxio_register) 
+		return sbus_readb(auxio_register);
+	return 0;
+}
+
+void set_auxio(unsigned char bits_on, unsigned char bits_off)
+{
+	unsigned char regval;
+	unsigned long flags;
+	spin_lock_irqsave(&auxio_lock, flags);
+	switch(sparc_cpu_model) {
+	case sun4c:
+		regval = sbus_readb(auxio_register);
+		sbus_writeb(((regval | bits_on) & ~bits_off) | AUXIO_ORMEIN,
+			auxio_register);
+		break;
+	case sun4m:
+		if(!auxio_register)
+			break;     /* VME chassis sun4m, no auxio. */
+		regval = sbus_readb(auxio_register);
+		sbus_writeb(((regval | bits_on) & ~bits_off) | AUXIO_ORMEIN4M,
+			auxio_register);
+		break;
+	case sun4d:
+		break;
+	default:
+		panic("Can't set AUXIO register on this machine.");
+	};
+	spin_unlock_irqrestore(&auxio_lock, flags);
+}
+
+
+/* sun4m power control register (AUXIO2) */
+
+volatile unsigned char * auxio_power_register = NULL;
+
+void __init auxio_power_probe(void)
+{
+	struct linux_prom_registers regs;
+	int node;
+	struct resource r;
+
+	/* Attempt to find the sun4m power control node. */
+	node = prom_getchild(prom_root_node);
+	node = prom_searchsiblings(node, "obio");
+	node = prom_getchild(node);
+	node = prom_searchsiblings(node, "power");
+	if (node == 0 || node == -1)
+		return;
+
+	/* Map the power control register. */
+	if (prom_getproperty(node, "reg", (char *)&regs, sizeof(regs)) <= 0)
+		return;
+	prom_apply_obio_ranges(&regs, 1);
+	memset(&r, 0, sizeof(r));
+	r.flags = regs.which_io & 0xF;
+	r.start = regs.phys_addr;
+	r.end = regs.phys_addr + regs.reg_size - 1;
+	auxio_power_register = (unsigned char *) of_ioremap(&r, 0,
+	    regs.reg_size, "auxpower");
+
+	/* Display a quick message on the console. */
+	if (auxio_power_register)
+		printk(KERN_INFO "Power off control detected.\n");
+}