[PATCH] powerpc: Kill _machine and hard-coded platform numbers

This removes statically assigned platform numbers and reworks the
powerpc platform probe code to use a better mechanism.  With this,
board support files can simply declare a new machine type with a
macro, and implement a probe() function that uses the flattened
device-tree to detect if they apply for a given machine.

We now have a machine_is() macro that replaces the comparisons of
_machine with the various PLATFORM_* constants.  This commit also
changes various drivers to use the new macro instead of looking at
_machine.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/platforms/chrp/setup.c

@@ -292,6 +292,10 @@ void __init chrp_setup_arch(void)
 
 	pci_create_OF_bus_map();
 
+#ifdef CONFIG_SMP
+	smp_ops = &chrp_smp_ops;
+#endif /* CONFIG_SMP */
+
 	/*
 	 * Print the banner, then scroll down so boot progress
 	 * can be printed.  -- Cort
@@ -506,8 +510,15 @@ chrp_init2(void)
 		ppc_md.progress("  Have fun!    ", 0x7777);
 }
 
-void __init chrp_init(void)
+static int __init chrp_probe(void)
 {
+ 	char *dtype = of_get_flat_dt_prop(of_get_flat_dt_root(),
+ 					  "device_type", NULL);
+ 	if (dtype == NULL)
+ 		return 0;
+ 	if (strcmp(dtype, "chrp"))
+		return 0;
+
 	ISA_DMA_THRESHOLD = ~0L;
 	DMA_MODE_READ = 0x44;
 	DMA_MODE_WRITE = 0x48;