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-rw-r--r--arch/arm/include/debug/sa1100.S67
1 files changed, 67 insertions, 0 deletions
diff --git a/arch/arm/include/debug/sa1100.S b/arch/arm/include/debug/sa1100.S
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+/* 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