ARM: shmobile: Move headsmp-sh73a0.S to headsmp-scu.S

Rename headsmp-sh73a0.S into headsmp-scu.S and
introduce shmobile_secondary_vector_scu().

The goal is to be able to share the function
above between all mach-shmobile SoCs that use
SCU for SMP. So far only sh73a0 use this.

At this time the SCU base address is still hard
coded in headsmp-scu.S to 0xf0000000, but this
will be changed in the future.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

1 files changed, 50 insertions, 0 deletions

diff --git a/arch/arm/mach-shmobile/headsmp-scu.S b/arch/arm/mach-shmobile/headsmp-scu.S
new file mode 100644
index 000000000000..4ee287d9c508
--- /dev/null
+++ b/arch/arm/mach-shmobile/headsmp-scu.S
@@ -0,0 +1,50 @@
+/*
+ * Shared SCU setup for mach-shmobile
+ *
+ * Copyright (C) 2012 Bastian Hecht
+ *
+ * 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
+ */
+
+#include <linux/linkage.h>
+#include <linux/init.h>
+#include <asm/memory.h>
+
+        __CPUINIT
+/*
+ * Reset vector for secondary CPUs.
+ *
+ * First we turn on L1 cache coherency for our CPU. Then we jump to
+ * shmobile_invalidate_start that invalidates the cache and hands over control
+ * to the common ARM startup code.
+ * This function will be mapped to address 0 by the SBAR register.
+ * A normal branch is out of range here so we need a long jump. We jump to
+ * the physical address as the MMU is still turned off.
+ */
+        .align  12
+ENTRY(shmobile_secondary_vector_scu)
+        mrc     p15, 0, r0, c0, c0, 5   @ read MIPDR
+        and     r0, r0, #3              @ mask out cpu ID
+        lsl     r0, r0, #3              @ we will shift by cpu_id * 8 bits
+        mov     r1, #0xf0000000         @ SCU base address
+        ldr     r2, [r1, #8]            @ SCU Power Status Register
+        mov     r3, #3
+        bic     r2, r2, r3, lsl r0      @ Clear bits of our CPU (Run Mode)
+        str     r2, [r1, #8]            @ write back
+
+        ldr     pc, 1f
+1:      .long shmobile_invalidate_start - PAGE_OFFSET + PLAT_PHYS_OFFSET
+ENDPROC(shmobile_secondary_vector_scu)