aboutsummaryrefslogtreecommitdiff
path: root/arch/arm/include/debug/8250.S
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm/include/debug/8250.S')
-rw-r--r--arch/arm/include/debug/8250.S36
1 files changed, 36 insertions, 0 deletions
diff --git a/arch/arm/include/debug/8250.S b/arch/arm/include/debug/8250.S
new file mode 100644
index 000000000000..92cab395677a
--- /dev/null
+++ b/arch/arm/include/debug/8250.S
@@ -0,0 +1,36 @@
+/*
+ * arch/arm/include/debug/8250.S
+ *
+ * Copyright (C) 1994-2013 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>
+
+ .macro addruart, rp, rv, tmp
+ ldr \rp, =CONFIG_DEBUG_UART_PHYS
+ ldr \rv, =CONFIG_DEBUG_UART_VIRT
+ .endm
+
+#define UART_SHIFT CONFIG_DEBUG_UART_8250_SHIFT
+
+ .macro senduart,rd,rx
+ strb \rd, [\rx, #UART_TX << UART_SHIFT]
+ .endm
+
+ .macro busyuart,rd,rx
+1002: ldrb \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
+#ifdef CONFIG_DEBUG_UART_8250_FLOW_CONTROL
+1001: ldrb \rd, [\rx, #UART_MSR << UART_SHIFT]
+ tst \rd, #UART_MSR_CTS
+ beq 1001b
+#endif
+ .endm