Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / arm / include / debug / efm32.S

diff --git a/kernel/arch/arm/include/debug/efm32.S b/kernel/arch/arm/include/debug/efm32.S
new file mode 100644 (file)
index 0000000..2265a19
--- /dev/null
+++ b/kernel/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