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-rw-r--r--kernel/arch/arm/include/debug/at91.S52
1 files changed, 52 insertions, 0 deletions
diff --git a/kernel/arch/arm/include/debug/at91.S b/kernel/arch/arm/include/debug/at91.S
new file mode 100644
index 000000000..c3c45e628
--- /dev/null
+++ b/kernel/arch/arm/include/debug/at91.S
@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2003-2005 SAN People
+ *
+ * Debugging macro include header
+ *
+ * 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.
+ *
+*/
+
+#if defined(CONFIG_AT91_DEBUG_LL_DBGU0)
+#define AT91_DBGU 0xfffff200 /* AT91_BASE_DBGU0 */
+#elif defined(CONFIG_AT91_DEBUG_LL_DBGU1)
+#define AT91_DBGU 0xffffee00 /* AT91_BASE_DBGU1 */
+#else
+/* On sama5d4, use USART3 as low level serial console */
+#define AT91_DBGU 0xfc00c000 /* SAMA5D4_BASE_USART3 */
+#endif
+
+#ifdef CONFIG_MMU
+#define AT91_IO_P2V(x) ((x) - 0x01000000)
+#else
+#define AT91_IO_P2V(x) (x)
+#endif
+
+#define AT91_DBGU_SR (0x14) /* Status Register */
+#define AT91_DBGU_THR (0x1c) /* Transmitter Holding Register */
+#define AT91_DBGU_TXRDY (1 << 1) /* Transmitter Ready */
+#define AT91_DBGU_TXEMPTY (1 << 9) /* Transmitter Empty */
+
+ .macro addruart, rp, rv, tmp
+ ldr \rp, =AT91_DBGU @ System peripherals (phys address)
+ ldr \rv, =AT91_IO_P2V(AT91_DBGU) @ System peripherals (virt address)
+ .endm
+
+ .macro senduart,rd,rx
+ strb \rd, [\rx, #(AT91_DBGU_THR)] @ Write to Transmitter Holding Register
+ .endm
+
+ .macro waituart,rd,rx
+1001: ldr \rd, [\rx, #(AT91_DBGU_SR)] @ Read Status Register
+ tst \rd, #AT91_DBGU_TXRDY @ DBGU_TXRDY = 1 when ready to transmit
+ beq 1001b
+ .endm
+
+ .macro busyuart,rd,rx
+1001: ldr \rd, [\rx, #(AT91_DBGU_SR)] @ Read Status Register
+ tst \rd, #AT91_DBGU_TXEMPTY @ DBGU_TXEMPTY = 1 when transmission complete
+ beq 1001b
+ .endm
+