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-rw-r--r--arch/arm/mach-s3c/sleep-s3c24xx.S69
1 files changed, 69 insertions, 0 deletions
diff --git a/arch/arm/mach-s3c/sleep-s3c24xx.S b/arch/arm/mach-s3c/sleep-s3c24xx.S
new file mode 100644
index 000000000..4b2af91f3
--- /dev/null
+++ b/arch/arm/mach-s3c/sleep-s3c24xx.S
@@ -0,0 +1,69 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (c) 2004 Simtec Electronics
+ * Ben Dooks <ben@simtec.co.uk>
+ *
+ * S3C2410 Power Manager (Suspend-To-RAM) support
+ *
+ * Based on PXA/SA1100 sleep code by:
+ * Nicolas Pitre, (c) 2002 Monta Vista Software Inc
+ * Cliff Brake, (c) 2001
+ */
+
+#include <linux/linkage.h>
+#include <linux/serial_s3c.h>
+#include <asm/assembler.h>
+#include "map.h"
+
+#include "regs-gpio.h"
+#include "regs-clock.h"
+
+/*
+ * S3C24XX_DEBUG_RESUME is dangerous if your bootloader does not
+ * reset the UART configuration, only enable if you really need this!
+ */
+//#define S3C24XX_DEBUG_RESUME
+
+ .text
+
+ /* sleep magic, to allow the bootloader to check for an valid
+ * image to resume to. Must be the first word before the
+ * s3c_cpu_resume entry.
+ */
+
+ .word 0x2bedf00d
+
+ /* s3c_cpu_resume
+ *
+ * resume code entry for bootloader to call
+ */
+
+ENTRY(s3c_cpu_resume)
+ mov r0, #PSR_I_BIT | PSR_F_BIT | SVC_MODE
+ msr cpsr_c, r0
+
+ @@ load UART to allow us to print the two characters for
+ @@ resume debug
+
+ mov r2, #S3C24XX_PA_UART & 0xff000000
+ orr r2, r2, #S3C24XX_PA_UART & 0xff000
+
+#if 0
+ /* SMDK2440 LED set */
+ mov r14, #S3C24XX_PA_GPIO
+ ldr r12, [ r14, #0x54 ]
+ bic r12, r12, #3<<4
+ orr r12, r12, #1<<7
+ str r12, [ r14, #0x54 ]
+#endif
+
+#ifdef S3C24XX_DEBUG_RESUME
+ mov r3, #'L'
+ strb r3, [ r2, #S3C2410_UTXH ]
+1001:
+ ldrb r14, [ r3, #S3C2410_UTRSTAT ]
+ tst r14, #S3C2410_UTRSTAT_TXE
+ beq 1001b
+#endif /* S3C24XX_DEBUG_RESUME */
+
+ b cpu_resume