1 files changed, 43 insertions, 0 deletions

diff --git a/arch/arm/include/debug/keystone.S b/arch/arm/include/debug/keystone.S
new file mode 100644
index 000000000000..9aef9ba3f4f0
--- /dev/null
+++ b/arch/arm/include/debug/keystone.S
@@ -0,0 +1,43 @@
+/*
+ * Early serial debug output macro for Keystone SOCs
+ *
+ * Copyright 2013 Texas Instruments, Inc.
+ *      Santosh Shilimkar <santosh.shilimkar@ti.com>
+ *
+ * Based on RMKs low level debug code.
+ *  Copyright (C) 1994-1999 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/serial_reg.h>
+
+#define UART_SHIFT 2
+#if defined(CONFIG_DEBUG_KEYSTONE_UART0)
+#define UART_PHYS               0x02530c00
+#define UART_VIRT               0xfeb30c00
+#elif defined(CONFIG_DEBUG_KEYSTONE_UART1)
+#define UART_PHYS               0x02531000
+#define UART_VIRT               0xfeb31000
+#endif
+
+        .macro  addruart, rp, rv, tmp
+        ldr     \rv, =UART_VIRT                 @ physical base address
+        ldr     \rp, =UART_PHYS                 @ virtual base address
+        .endm
+
+        .macro  senduart,rd,rx
+        str     \rd, [\rx, #UART_TX << UART_SHIFT]
+        .endm
+
+        .macro  busyuart,rd,rx
+1002:   ldr     \rd, [\rx, #UART_LSR << UART_SHIFT]
+        and     \rd, \rd, #UART_LSR_TEMT | UART_LSR_THRE
+        teq     \rd, #UART_LSR_TEMT | UART_LSR_THRE
+        bne     1002b
+        .endm
+
+        .macro  waituart,rd,rx
+        .endm