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authorFlorian Fainelli <f.fainelli@gmail.com>2014-01-08 09:19:50 -0800
committerFlorian Fainelli <f.fainelli@gmail.com>2014-09-17 10:56:06 -0700
commitb51312bebfa4452470c2bbf179200cb7c16d82d4 (patch)
tree9a4156a40cc948f39af584979607b6967b801ac4 /arch/arm/include/debug
parentdc6aec60e15fec86cdafc47d9fe3e2ca6c10958b (diff)
downloadblackbird-op-linux-b51312bebfa4452470c2bbf179200cb7c16d82d4.tar.gz
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ARM: BCM63XX: add low-level UART debug support
Broadcom BCM63xx DSL SoCs have a different UART implementation for which we need specially crafted low-level debug assembly code to support. Add support for this using the standard definitions provided in include/linux/serial_bcm63xx.h (shared with their MIPS counterparts). Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Diffstat (limited to 'arch/arm/include/debug')
-rw-r--r--arch/arm/include/debug/bcm63xx.S33
1 files changed, 33 insertions, 0 deletions
diff --git a/arch/arm/include/debug/bcm63xx.S b/arch/arm/include/debug/bcm63xx.S
new file mode 100644
index 000000000000..e7164d570f44
--- /dev/null
+++ b/arch/arm/include/debug/bcm63xx.S
@@ -0,0 +1,33 @@
+/*
+ * Broadcom BCM63xx low-level UART debug
+ *
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * 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_bcm63xx.h>
+
+ .macro addruart, rp, rv, tmp
+ ldr \rp, =CONFIG_DEBUG_UART_PHYS
+ ldr \rv, =CONFIG_DEBUG_UART_VIRT
+ .endm
+
+ .macro senduart, rd, rx
+ /* word access do not work */
+ strb \rd, [\rx, #UART_FIFO_REG]
+ .endm
+
+ .macro waituart, rd, rx
+1001: ldr \rd, [\rx, #UART_IR_REG]
+ tst \rd, #(1 << UART_IR_TXEMPTY)
+ beq 1001b
+ .endm
+
+ .macro busyuart, rd, rx
+1002: ldr \rd, [\rx, #UART_IR_REG]
+ tst \rd, #(1 << UART_IR_TXTRESH)
+ beq 1002b
+ .endm
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