powerpc/e6500: Add support for hardware threads

The general idea is that each core will release all of its
threads into the secondary thread startup code, which will
eventually wait in the secondary core holding area, for the
appropriate bit in the PACA to be set. The kick_cpu function
pointer will set that bit in the PACA, and thus "release"
the core/thread to boot. We also need to do a few things that
U-Boot normally does for CPUs (like enable branch prediction).

Signed-off-by: Andy Fleming <afleming@freescale.com>
[scottwood@freescale.com: various changes, including only enabling
 threads if Linux wants to kick them]
Signed-off-by: Scott Wood <scottwood@freescale.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/arch/powerpc/kernel/setup-common.c b/arch/powerpc/kernel/setup-common.c
index e239df3768ac..1bb4dcde0dcc 100644
--- a/arch/powerpc/kernel/setup-common.c
+++ b/arch/powerpc/kernel/setup-common.c
@@ -456,18 +456,20 @@ void __init smp_setup_cpu_maps(void)
                 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s",
                                 &len);
                 if (intserv) {
-                        nthreads = len / sizeof(int);
                         DBG("    ibm,ppc-interrupt-server#s -> %d threads\n",
                             nthreads);
                 } else {
                         DBG("    no ibm,ppc-interrupt-server#s -> 1 thread\n");
-                        intserv = of_get_property(dn, "reg", NULL);
+                        intserv = of_get_property(dn, "reg", &len);
                         if (!intserv) {
                                 cpu_be = cpu_to_be32(cpu);
                                 intserv = &cpu_be;      /* assume logical == phys */
+                                len = 4;
                         }
                 }
 
+                nthreads = len / sizeof(int);
+
                 for (j = 0; j < nthreads && cpu < nr_cpu_ids; j++) {
                         DBG("    thread %d -> cpu %d (hard id %d)\n",
                             j, cpu, be32_to_cpu(intserv[j]));