summaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-uniphier/headsmp.S
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm/mach-uniphier/headsmp.S')
-rw-r--r--arch/arm/mach-uniphier/headsmp.S43
1 files changed, 43 insertions, 0 deletions
diff --git a/arch/arm/mach-uniphier/headsmp.S b/arch/arm/mach-uniphier/headsmp.S
new file mode 100644
index 000000000000..c819dff84546
--- /dev/null
+++ b/arch/arm/mach-uniphier/headsmp.S
@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2015 Masahiro Yamada <yamada.masahiro@socionext.com>
+ *
+ * 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.
+ */
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+#include <asm/cp15.h>
+
+ENTRY(uniphier_smp_trampoline)
+ARM_BE8(setend be) @ ensure we are in BE8 mode
+ mrc p15, 0, r0, c0, c0, 5 @ MPIDR (Multiprocessor Affinity Reg)
+ and r2, r0, #0x3 @ CPU ID
+ ldr r1, uniphier_smp_trampoline_jump
+ ldr r3, uniphier_smp_trampoline_poll_addr
+ mrc p15, 0, r0, c1, c0, 0 @ SCTLR (System Control Register)
+ orr r0, r0, #CR_I @ Enable ICache
+ bic r0, r0, #(CR_C | CR_M) @ Disable MMU and Dcache
+ mcr p15, 0, r0, c1, c0, 0
+ b 1f @ cache the following 5 instructions
+0: wfe
+1: ldr r0, [r3]
+ cmp r0, r2
+ bxeq r1 @ branch to secondary_startup
+ b 0b
+ .globl uniphier_smp_trampoline_jump
+uniphier_smp_trampoline_jump:
+ .word 0 @ set virt_to_phys(secondary_startup)
+ .globl uniphier_smp_trampoline_poll_addr
+uniphier_smp_trampoline_poll_addr:
+ .word 0 @ set CPU ID to be kicked to this reg
+ .globl uniphier_smp_trampoline_end
+uniphier_smp_trampoline_end:
+ENDPROC(uniphier_smp_trampoline)