callout_reboot_ixp23xx.s

QNX ADS BSP code for i.MX27 chips

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/*
 * IXP23XX specific reboot. Triggering the OST watchdog reset to fire, as
 * described in the docs, seems to have no effect. However, the redboot
 * source provided by Intel uses the sequence below, which does work, 
 * although I can't find it documented anywhere...
 */

#include "callout.ah"
#include <arm/ixp23xx.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
 * -----------------------------------------------------------------------
 */
patch_reboot:
	stmdb	sp!,{r4,lr}
	add		r4, r0, r2					// address of callout routine

	/*
	 * Map interrupt controller registers
	 */
	mov		r0, #0x04						// size of magic reset register
	ldr		r1, Lreset_base
	bl		callout_io_map
	CALLOUT_PATCH	r4, r0, r1, r2, ip

	ldmia	sp!,{r4,pc}

Lreset_base:	.word	0x95024004			// magic reset register

CALLOUT_START(reboot_ixp23xx, 0, patch_reboot)
	mov		ip,     #0x000000ff		// reset controller base (patched)
	orr		ip, ip, #0x0000ff00
	orr		ip, ip, #0x00ff0000
	orr		ip, ip, #0xff000000


	mov		r1,		#0x00AA
	orr		r1, r1,	#0x5500
	mov		r2, 	#0x8000
	strh	r1, [ip]
	strh	r2, [ip]

0:	b		0b

CALLOUT_END(reboot_ixp23xx)