v4.19.13 snapshot.
diff --git a/arch/arm/include/debug/omap2plus.S b/arch/arm/include/debug/omap2plus.S
new file mode 100644
index 0000000..192a758
--- /dev/null
+++ b/arch/arm/include/debug/omap2plus.S
@@ -0,0 +1,83 @@
+/*
+ * Debugging macro include header
+ *
+ * Copyright (C) 1994-1999 Russell King
+ * Moved from linux/arch/arm/kernel/debug.S by Ben Dooks
+ *
+ * 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_reg.h>
+
+/* External port on Zoom2/3 */
+#define ZOOM_UART_BASE 0x10000000
+#define ZOOM_UART_VIRT 0xfa400000
+
+#define OMAP_PORT_SHIFT 2
+#define ZOOM_PORT_SHIFT 1
+
+#define UART_OFFSET(addr) ((addr) & 0x00ffffff)
+
+ .pushsection .data
+ .align 2
+omap_uart_phys: .word 0
+omap_uart_virt: .word 0
+omap_uart_lsr: .word 0
+ .popsection
+
+ .macro addruart, rp, rv, tmp
+
+ /* Use omap_uart_phys/virt if already configured */
+10: adr \rp, 99f @ get effective addr of 99f
+ ldr \rv, [\rp] @ get absolute addr of 99f
+ sub \rv, \rv, \rp @ offset between the two
+ ldr \rp, [\rp, #4] @ abs addr of omap_uart_phys
+ sub \tmp, \rp, \rv @ make it effective
+ ldr \rp, [\tmp, #0] @ omap_uart_phys
+ ldr \rv, [\tmp, #4] @ omap_uart_virt
+ cmp \rp, #0 @ is port configured?
+ cmpne \rv, #0
+ bne 100f @ already configured
+
+ /* Configure the UART offset from the phys/virt base */
+#ifdef CONFIG_DEBUG_ZOOM_UART
+ ldr \rp, =ZOOM_UART_BASE
+ str \rp, [\tmp, #0] @ omap_uart_phys
+ ldr \rp, =ZOOM_UART_VIRT
+ str \rp, [\tmp, #4] @ omap_uart_virt
+ mov \rp, #(UART_LSR << ZOOM_PORT_SHIFT)
+ str \rp, [\tmp, #8] @ omap_uart_lsr
+#endif
+ b 10b
+
+ .align
+99: .word .
+ .word omap_uart_phys
+ .ltorg
+
+100: /* Pass the UART_LSR reg address */
+ ldr \tmp, [\tmp, #8] @ omap_uart_lsr
+ add \rp, \rp, \tmp
+ add \rv, \rv, \tmp
+ .endm
+
+ .macro senduart,rd,rx
+ orr \rd, \rd, \rx, lsl #24 @ preserve LSR reg offset
+ bic \rx, \rx, #0xff @ get base (THR) reg address
+ strb \rd, [\rx] @ send lower byte of rd
+ orr \rx, \rx, \rd, lsr #24 @ restore original rx (LSR)
+ bic \rd, \rd, #(0xff << 24) @ restore original rd
+ .endm
+
+ .macro busyuart,rd,rx
+1001: ldrb \rd, [\rx] @ rx contains UART_LSR address
+ and \rd, \rd, #(UART_LSR_TEMT | UART_LSR_THRE)
+ teq \rd, #(UART_LSR_TEMT | UART_LSR_THRE)
+ bne 1001b
+ .endm
+
+ .macro waituart,rd,rx
+ .endm