v4.19.13 snapshot.
diff --git a/arch/arm/include/debug/zynq.S b/arch/arm/include/debug/zynq.S
new file mode 100644
index 0000000..060cb5b
--- /dev/null
+++ b/arch/arm/include/debug/zynq.S
@@ -0,0 +1,56 @@
+/*
+ * Debugging macro include header
+ *
+ * Copyright (C) 2011 Xilinx
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+#define UART_CR_OFFSET 0x00 /* Control Register [8:0] */
+#define UART_SR_OFFSET 0x2C /* Channel Status [11:0] */
+#define UART_FIFO_OFFSET 0x30 /* FIFO [15:0] or [7:0] */
+
+#define UART_SR_TXFULL 0x00000010 /* TX FIFO full */
+#define UART_SR_TXEMPTY 0x00000008 /* TX FIFO empty */
+
+#define UART0_PHYS 0xE0000000
+#define UART0_VIRT 0xF0800000
+#define UART1_PHYS 0xE0001000
+#define UART1_VIRT 0xF0801000
+
+#if IS_ENABLED(CONFIG_DEBUG_ZYNQ_UART1)
+# define LL_UART_PADDR UART1_PHYS
+# define LL_UART_VADDR UART1_VIRT
+#else
+# define LL_UART_PADDR UART0_PHYS
+# define LL_UART_VADDR UART0_VIRT
+#endif
+
+ .macro addruart, rp, rv, tmp
+ ldr \rp, =LL_UART_PADDR @ physical
+ ldr \rv, =LL_UART_VADDR @ virtual
+ .endm
+
+ .macro senduart,rd,rx
+ strb \rd, [\rx, #UART_FIFO_OFFSET] @ TXDATA
+ .endm
+
+ .macro waituart,rd,rx
+1001: ldr \rd, [\rx, #UART_SR_OFFSET]
+ARM_BE8( rev \rd, \rd )
+ tst \rd, #UART_SR_TXEMPTY
+ beq 1001b
+ .endm
+
+ .macro busyuart,rd,rx
+1002: ldr \rd, [\rx, #UART_SR_OFFSET] @ get status register
+ARM_BE8( rev \rd, \rd )
+ tst \rd, #UART_SR_TXFULL @
+ bne 1002b @ wait if FIFO is full
+ .endm