FreeCalypso > hg > freecalypso-citrine

diff lldbg/serio.S @ 0:75a11d740a02

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initial import of gsm-fw from freecalypso-sw rev 1033:5ab737ac3ad7
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 09 Jun 2016 00:02:41 +0000
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lldbg/serio.S	Thu Jun 09 00:02:41 2016 +0000
@@ -0,0 +1,34 @@
+#include "../include/config.h"
+#include "ns16550.h"
+
+/* this module implements the elementary serial I/O operations */
+
+	.text
+	.code	32
+	.globl	lldbg_serial_out
+lldbg_serial_out:
+	ldr	r2, =CONFIG_LLDBG_UART_BASE
+1:	ldrb	r3, [r2, #NS16550_LSR]
+	tst	r3, #NS16550_LSR_THRE
+	beq	1b
+	strb	r0, [r2, #NS16550_THR]
+	bx	lr
+
+	.globl	lldbg_serial_in_poll
+lldbg_serial_in_poll:
+	ldr	r2, =CONFIG_LLDBG_UART_BASE
+	ldrb	r3, [r2, #NS16550_LSR]
+	tst	r3, #NS16550_LSR_DR
+	ldrneb	r0, [r2, #NS16550_RBR]
+	mvneq	r0, #0
+	bx	lr
+
+#if 0	// not needed currently
+	.globl	lldbg_serial_flush
+lldbg_serial_flush:
+	ldr	r2, =CONFIG_LLDBG_UART_BASE
+1:	ldrb	r3, [r2, #NS16550_LSR]
+	tst	r3, #NS16550_LSR_TEMP
+	beq	1b
+	bx	lr
+#endif