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authorUwe Kleine-König <u.kleine-koenig@pengutronix.de>2013-10-08 16:44:17 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2013-10-29 11:06:04 +0000
commit494e492dd88d36cd201eae99873492450d1e9b4f (patch)
tree1137d16a179ef29ac5c001e97c2ce1b5f48fec4b /arch/arm/include
parent3159f372354e8e1f5dee714663d705dd2c7e0759 (diff)
ARM: 7850/1: DEBUG_LL on efm32 SoCs
This implements output of debug messages on efm32 SoCs. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/include')
-rw-r--r--arch/arm/include/debug/efm32.S45
1 files changed, 45 insertions, 0 deletions
diff --git a/arch/arm/include/debug/efm32.S b/arch/arm/include/debug/efm32.S
new file mode 100644
index 000000000000..2265a199280c
--- /dev/null
+++ b/arch/arm/include/debug/efm32.S
@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2013 Pengutronix
+ * Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>
+ *
+ * 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.
+ */
+
+#define UARTn_CMD 0x000c
+#define UARTn_CMD_TXEN 0x0004
+
+#define UARTn_STATUS 0x0010
+#define UARTn_STATUS_TXC 0x0020
+#define UARTn_STATUS_TXBL 0x0040
+
+#define UARTn_TXDATA 0x0034
+
+ .macro addruart, rx, tmp
+ ldr \rx, =(CONFIG_DEBUG_UART_PHYS)
+
+ /*
+ * enable TX. The driver might disable it to save energy. We
+ * don't care about disabling at the end as during debug power
+ * consumption isn't that important.
+ */
+ ldr \tmp, =(UARTn_CMD_TXEN)
+ str \tmp, [\rx, #UARTn_CMD]
+ .endm
+
+ .macro senduart,rd,rx
+ strb \rd, [\rx, #UARTn_TXDATA]
+ .endm
+
+ .macro waituart,rd,rx
+1001: ldr \rd, [\rx, #UARTn_STATUS]
+ tst \rd, #UARTn_STATUS_TXBL
+ beq 1001b
+ .endm
+
+ .macro busyuart,rd,rx
+1001: ldr \rd, [\rx, UARTn_STATUS]
+ tst \rd, #UARTn_STATUS_TXC
+ bne 1001b
+ .endm