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-rw-r--r--arch/arm/cpu/armv7/uniphier/smp.S54
1 files changed, 54 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/uniphier/smp.S b/arch/arm/cpu/armv7/uniphier/smp.S
new file mode 100644
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--- /dev/null
+++ b/arch/arm/cpu/armv7/uniphier/smp.S
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2013 Panasonic Corporation
+ * Author: Masahiro Yamada <yamada.m@jp.panasonic.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <config.h>
+#include <linux/linkage.h>
+#include <asm/system.h>
+#include <asm/arch/led.h>
+#include <asm/arch/sbc-regs.h>
+
+/* Entry point of U-Boot main program for the secondary CPU */
+LENTRY(secondary_entry)
+ mrc p15, 0, r0, c1, c0, 0 @ SCTLR (System Contrl Register)
+ bic r0, r0, #(CR_C | CR_M) @ MMU and Dcache disable
+ mcr p15, 0, r0, c1, c0, 0
+ mcr p15, 0, r0, c8, c7, 0 @ invalidate TLBs
+ mcr p15, 0, r0, c7, c5, 0 @ invalidate icache
+ dsb
+ led_write(C,0,,)
+ ldr r1, =ROM_BOOT_ROMRSV2
+ mov r0, #0
+ str r0, [r1]
+0: wfe
+ ldr r4, [r1] @ r4: entry point for secondary CPUs
+ cmp r4, #0
+ beq 0b
+ led_write(C, P, U, 1)
+ bx r4 @ secondary CPUs jump to linux
+ENDPROC(secondary_entry)
+
+ENTRY(wakeup_secondary)
+ ldr r1, =ROM_BOOT_ROMRSV2
+0: ldr r0, [r1]
+ cmp r0, #0
+ bne 0b
+
+ /* set entry address and send event to the secondary CPU */
+ ldr r0, =secondary_entry
+ str r0, [r1]
+ ldr r0, [r1] @ make sure store is complete
+ mov r0, #0x100
+0: subs r0, r0, #1 @ I don't know the reason, but without this wait
+ bne 0b @ fails to wake up the secondary CPU
+ sev
+
+ /* wait until the secondary CPU reach to secondary_entry */
+0: ldr r0, [r1]
+ cmp r0, #0
+ bne 0b
+ bx lr
+ENDPROC(wakeup_secondary)