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-rw-r--r--arch/arm/include/debug/meson.S35
1 files changed, 35 insertions, 0 deletions
diff --git a/arch/arm/include/debug/meson.S b/arch/arm/include/debug/meson.S
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+++ b/arch/arm/include/debug/meson.S
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+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2014 Carlo Caione
+ * Carlo Caione <carlo@caione.org>
+ */
+
+#define MESON_AO_UART_WFIFO 0x0
+#define MESON_AO_UART_STATUS 0xc
+
+#define MESON_AO_UART_TX_FIFO_EMPTY (1 << 22)
+#define MESON_AO_UART_TX_FIFO_FULL (1 << 21)
+
+ .macro addruart, rp, rv, tmp
+ ldr \rp, =(CONFIG_DEBUG_UART_PHYS) @ physical
+ ldr \rv, =(CONFIG_DEBUG_UART_VIRT) @ virtual
+ .endm
+
+ .macro senduart,rd,rx
+ str \rd, [\rx, #MESON_AO_UART_WFIFO]
+ .endm
+
+ .macro busyuart,rd,rx
+1002: ldr \rd, [\rx, #MESON_AO_UART_STATUS]
+ tst \rd, #MESON_AO_UART_TX_FIFO_EMPTY
+ beq 1002b
+ .endm
+
+ .macro waituartcts,rd,rx
+ .endm
+
+ .macro waituarttxrdy,rd,rx
+1001: ldr \rd, [\rx, #MESON_AO_UART_STATUS]
+ tst \rd, #MESON_AO_UART_TX_FIFO_FULL
+ bne 1001b
+ .endm