callout_debug_mx1.s

QNX ADS BSP code for i.MX27 chips

/*
 * $QNXLicenseC: 
 * Copyright 2007, QNX Software Systems.  
 *  
 * Licensed under the Apache License, Version 2.0 (the "License"). You  
 * may not reproduce, modify or distribute this software except in  
 * compliance with the License. You may obtain a copy of the License  
 * at: http://www.apache.org/licenses/LICENSE-2.0  
 *  
 * Unless required by applicable law or agreed to in writing, software  
 * distributed under the License is distributed on an "AS IS" basis,  
 * WITHOUT WARRANTIES OF ANY KIND, either express or implied. 
 * 
 * This file may contain contributions from others, either as  
 * contributors under the License or as licensors under other terms.   
 * Please review this entire file for other proprietary rights or license  
 * notices, as well as the QNX Development Suite License Guide at  
 * http://licensing.qnx.com/license-guide/ for other information. 
 * $
 */

/*
 * MC9328MX1/MX9328MX21/MCIMX31 UART specific polled serial I/O
 */

#include "callout.ah"
#include <arm/mx1.h>


/*
 * -----------------------------------------------------------------------
 * Routine to patch callout code
 *
 * On entry:
 *	r0 - physical address of syspage
 *	r1 - virtual  address of syspage
 *	r2 - offset from start of syspage to start of the callout routine
 *	r3 - offset from start of syspage to read/write data used by callout
 *  [sp]   - data registered with callout via callout_register_data()
 *  [sp+4] - address of callout definition (CALLOUT_START)
 * -----------------------------------------------------------------------
 */

patch_debug:
	stmdb	sp!, {r4, lr}
	add		r4, r0, r2					// address of callout routine

	// Map registers
	ldr		r1, [sp, #8]				// debug_device[...]
	ldr		r1, [r1, #DDI_BASE]
	mov		r0, #MX1_UART_SIZE
	bl		callout_io_map

	/* Patch the callout routine */
	CALLOUT_PATCH	r4, r0, r1, r2, ip
	ldmia	sp!, {r4, pc}


/*
 * -----------------------------------------------------------------------
 * void	display_char_mx1(struct sypage_entry *, char)
 * -----------------------------------------------------------------------
 */
CALLOUT_START(display_char_mx1, 0, patch_debug)
	mov		ip,     #0x000000ff
	orr		ip, ip, #0x0000ff00
	orr		ip, ip, #0x00ff0000
	orr		ip, ip, #0xff000000
0:	
	ldr		r3, [ip, #MX1_UART_SR1]
	tst		r3, #MX1_USR1_TRDY
	beq		0b
	str 	r1, [ip, #MX1_UART_TXDATA]
	mov		pc, lr
CALLOUT_END(display_char_mx1)


/*
 * -----------------------------------------------------------------------
 * char	poll_key_mx1(struct sypage_entry *)
 * -----------------------------------------------------------------------
 */
CALLOUT_START(poll_key_mx1, 0, patch_debug)
	mov		ip,     #0x000000ff
	orr		ip, ip, #0x0000ff00
	orr		ip, ip, #0x00ff0000
	orr		ip, ip, #0xff000000

	mvn		r0, #1
	ldr		r3, [ip, #MX1_UART_SR2]
	tst		r3, #MX1_USR2_RDR
	beq		0f
	ldr     r3, [ip, #MX1_UART_RXDATA]
	and     r0, r3, #0xFF

0:
	mov		pc, lr
CALLOUT_END(poll_key_mx1)

/*
 * -----------------------------------------------------------------------
 * -----------------------------------------------------------------------
 */
CALLOUT_START(break_detect_mx1, 0, patch_debug)
	mov		ip,     #0x000000ff
	orr		ip, ip, #0x0000ff00
	orr		ip, ip, #0x00ff0000
	orr		ip, ip, #0xff000000

	ldr		r0, [ip, #MX1_UART_SR2]
	ands	r0, r0, #MX1_USR2_BRCD
	beq		0f
	str		r0, [ip, #MX1_UART_SR2]
	ldr     r0, [ip, #MX1_UART_RXDATA]
	mov		r0, #1
0:
	mov		pc, lr
CALLOUT_END(break_detect_mx1)