GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

source/trusted-firmware/trusted-firmware-a-2.8/plat/imx/common/lpuart_console.S

@@ -0,0 +1,76 @@
+/*
+ * Copyright (c) 2015-2020, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arch.h>
+#include <asm_macros.S>
+#include <console_macros.S>
+#include <assert_macros.S>
+#include "imx8_lpuart.h"
+
+	.globl	console_lpuart_register
+	.globl	console_lpuart_init
+	.globl	console_lpuart_putc
+	.globl	console_lpuart_getc
+	.globl	console_lpuart_flush
+
+func console_lpuart_register
+	mov	x7, x30
+	mov	x6, x3
+	cbz	x6, register_fail
+	str	x0, [x6, #CONSOLE_T_BASE]
+
+	bl	console_lpuart_init
+	cbz	x0, register_fail
+
+	mov	x0, x6
+	mov	x30, x7
+	finish_console_register lpuart putc=1, getc=1, flush=1
+
+register_fail:
+	ret	x7
+endfunc console_lpuart_register
+
+func console_lpuart_init
+	mov	w0, #1
+	ret
+endfunc console_lpuart_init
+
+func console_lpuart_putc
+	ldr	x1, [x1, #CONSOLE_T_BASE]
+	cbz	x1, putc_error
+	/* Prepare '\r' to '\n' */
+	cmp	w0, #0xA
+	b.ne	2f
+1:
+	/* Check if the transmit FIFO is full */
+	ldr	w2, [x1, #STAT]
+	tbz	w2, #23, 1b
+	mov	w2, #0xD
+	str	w2, [x1, #DATA]
+2:
+	/* Check if the transmit FIFO is full */
+	ldr	w2, [x1, #STAT]
+	tbz	w2, #23, 2b
+	str	w0, [x1, #DATA]
+	ret
+putc_error:
+	mov	w0, #-1
+	ret
+endfunc console_lpuart_putc
+
+func console_lpuart_getc
+	ldr	x0, [x0, #CONSOLE_T_BASE]
+	cbz	x0, getc_error
+	/* Check if the receive FIFO state */
+	ret
+getc_error:
+	mov	w0, #-1
+	ret
+endfunc console_lpuart_getc
+
+func console_lpuart_flush
+	ret
+endfunc console_lpuart_flush