1 files changed, 67 insertions, 0 deletions
diff --git a/arch/arm/include/debug/sa1100.S b/arch/arm/include/debug/sa1100.S
new file mode 100644
index 0000000000..7968ea52df
--- /dev/null
+++ b/arch/arm/include/debug/sa1100.S
@@ -0,0 +1,67 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/* arch/arm/include/debug/sa1100.S
+ *
+ * Debugging macro include header
+ *
+ *  Copyright (C) 1994-1999 Russell King
+ *  Moved from linux/arch/arm/kernel/debug.S by Ben Dooks
+*/
+
+#define UTCR3		0x0c
+#define UTDR		0x14
+#define UTSR1		0x20
+#define UTCR3_TXE	0x00000002	/* Transmit Enable                 */
+#define UTSR1_TBY	0x00000001	/* Transmitter BusY (read)         */
+#define UTSR1_TNF	0x00000004	/* Transmit FIFO Not Full (read)   */
+
+		.macro	addruart, rp, rv, tmp
+		mrc	p15, 0, \rp, c1, c0
+		tst	\rp, #1			@ MMU enabled?
+		moveq	\rp, #0x80000000	@ physical base address
+		movne	\rp, #0xf8000000	@ virtual address
+
+		@ We probe for the active serial port here, coherently with
+		@ the comment in arch/arm/mach-sa1100/include/mach/uncompress.h.
+		@ We assume r1 can be clobbered.
+
+		@ see if Ser3 is active
+		add	\rp, \rp, #0x00050000
+		ldr	\rv, [\rp, #UTCR3]
+		tst	\rv, #UTCR3_TXE
+
+		@ if Ser3 is inactive, then try Ser1
+		addeq	\rp, \rp, #(0x00010000 - 0x00050000)
+		ldreq	\rv, [\rp, #UTCR3]
+		tsteq	\rv, #UTCR3_TXE
+
+		@ if Ser1 is inactive, then try Ser2
+		addeq	\rp, \rp, #(0x00030000 - 0x00010000)
+		ldreq	\rv, [\rp, #UTCR3]
+		tsteq	\rv, #UTCR3_TXE
+
+		@ clear top bits, and generate both phys and virt addresses
+		lsl	\rp, \rp, #8
+		lsr	\rp, \rp, #8
+		orr	\rv, \rp, #0xf8000000	@ virtual
+		orr	\rp, \rp, #0x80000000	@ physical
+
+		.endm
+
+		.macro	senduart,rd,rx
+		str	\rd, [\rx, #UTDR]
+		.endm
+
+		.macro	waituartcts,rd,rx
+		.endm
+
+		.macro	waituarttxrdy,rd,rx
+1001:		ldr	\rd, [\rx, #UTSR1]
+		tst	\rd, #UTSR1_TNF
+		beq	1001b
+		.endm
+
+		.macro	busyuart,rd,rx
+1001:		ldr	\rd, [\rx, #UTSR1]
+		tst	\rd, #UTSR1_TBY
+		bne	1001b
+		.endm