start.s

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/*
 * Copyright (C) 2003	Josef Baumgartner <[e-mail]>
 * Based on code from Bernhard Kuhn <[e-mail]>
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <config.h>
#include "version.h"

#ifndef	 CONFIG_IDENT_STRING
#define	 CONFIG_IDENT_STRING ""
#endif

/* last three long word reserved for cache status */
#define CACR_STATUS	(CFG_INIT_RAM_ADDR+CFG_INIT_RAM_END-12)
#define ICACHE_STATUS	(CFG_INIT_RAM_ADDR+CFG_INIT_RAM_END- 8)
#define DCACHE_STATUS	(CFG_INIT_RAM_ADDR+CFG_INIT_RAM_END- 4)

#define _START	_start
#define _FAULT	_fault

#define SAVE_ALL						\
	move.w	#0x2700,%sr;		/* disable intrs */	\
	subl	#60,%sp;		/* space for 15 regs */ \
	moveml	%d0-%d7/%a0-%a6,%sp@;

#define RESTORE_ALL						\
	moveml	%sp@,%d0-%d7/%a0-%a6;				\
	addl	#60,%sp;		/* space for 15 regs */ \
	rte;

#if defined(CONFIG_CF_SBF)
#define ASM_DRAMINIT	(asm_dram_init - TEXT_BASE + CFG_INIT_RAM_ADDR)
#define ASM_SBF_IMG_HDR	(asm_sbf_img_hdr - TEXT_BASE + CFG_INIT_RAM_ADDR)
#endif

.text

/*
 *	Vector table. This is used for initial platform startup.
 *	These vectors are to catch any un-intended traps.
 */
_vectors:
#if defined(CONFIG_CF_SBF)

INITSP:	.long	0		/* Initial SP	*/
INITPC:	.long	ASM_DRAMINIT	/* Initial PC 	*/

#else

INITSP:		.long	0	/* Initial SP	*/
INITPC:		.long	_START	/* Initial PC 		*/

#endif

vector02:	.long	_FAULT	/* Access Error		*/
vector03:	.long	_FAULT	/* Address Error	*/
vector04:	.long	_FAULT	/* Illegal Instruction	*/
vector05:	.long	_FAULT	/* Reserved		*/
vector06:	.long	_FAULT	/* Reserved		*/
vector07:	.long	_FAULT	/* Reserved		*/
vector08:	.long	_FAULT	/* Privilege Violation	*/
vector09:	.long	_FAULT	/* Trace		*/
vector0A:	.long	_FAULT	/* Unimplemented A-Line	*/
vector0B:	.long	_FAULT	/* Unimplemented F-Line	*/
vector0C:	.long	_FAULT	/* Debug Interrupt	*/
vector0D:	.long	_FAULT	/* Reserved		*/
vector0E:	.long	_FAULT	/* Format Error		*/
vector0F:	.long	_FAULT	/* Unitialized Int.	*/

/* Reserved */
vector10_17:
.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT

vector18:	.long	_FAULT	/* Spurious Interrupt	*/
vector19:	.long	_FAULT	/* Autovector Level 1	*/
vector1A:	.long	_FAULT	/* Autovector Level 2	*/
vector1B:	.long	_FAULT	/* Autovector Level 3	*/
vector1C:	.long	_FAULT	/* Autovector Level 4	*/
vector1D:	.long	_FAULT	/* Autovector Level 5	*/
vector1E:	.long	_FAULT	/* Autovector Level 6	*/
vector1F:	.long	_FAULT	/* Autovector Level 7	*/

#if !defined(CONFIG_CF_SBF)

/* TRAP #0 - #15 */
vector20_2F:
.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT

/* Reserved	*/
vector30_3F:
.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT

vector64_127:
.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT

vector128_191:
.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT

vector192_255:
.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
#endif

#if defined(CONFIG_CF_SBF)
	/* Image header: chksum 4 bytes, len 4 bytes, img dest 4 bytes */
asm_sbf_img_hdr:
	.long	0x00000000	/* checksum, not yet implemented */
	.long	0x00030000	/* image length */
	.long	TEXT_BASE	/* image to be relocated at */

asm_dram_init:
	move.l	#(CFG_INIT_RAM_ADDR + CFG_INIT_RAM_CTRL), %d0
	movec	%d0, %RAMBAR1	/* init Rambar */
	move.l	#(CFG_INIT_RAM_ADDR + CFG_INIT_SP_OFFSET), %sp
	clr.l %sp@-

	/* Must disable global address */
	move.l	#0xFC008000, %a1
	move.l	#(CFG_CS0_BASE), (%a1)
	move.l	#0xFC008008, %a1
	move.l	#(CFG_CS0_CTRL), (%a1)
	move.l	#0xFC008004, %a1
	move.l	#(CFG_CS0_MASK), (%a1)

	/*
	 * Dram Initialization
	 * a1, a2, and d0
	 */
	/* mscr sdram */
	move.l	#0xFC0A4074, %a1
	move.b	#(CFG_SDRAM_DRV_STRENGTH), (%a1)
	nop

	/* SDRAM Chip 0 and 1 */
	move.l	#0xFC0B8110, %a1
	move.l	#0xFC0B8114, %a2

	/* calculate the size */
	move.l	#0x13, %d1
	move.l	#(CFG_SDRAM_SIZE), %d2
#ifdef CFG_SDRAM_BASE1
	lsr.l	#1, %d2
#endif

dramsz_loop:
	lsr.l	#1, %d2
	add.l	#1, %d1
	cmp.l	#1, %d2
	bne	dramsz_loop

	/* SDRAM Chip 0 and 1 */
	move.l	#(CFG_SDRAM_BASE), (%a1)
	or.l	%d1, (%a1)
#ifdef CFG_SDRAM_BASE1
	move.l	#(CFG_SDRAM_BASE1), (%a2)
	or.l	%d1, (%a2)
#endif
	nop

	/* dram cfg1 and cfg2 */
	move.l	#0xFC0B8008, %a1
	move.l	#(CFG_SDRAM_CFG1), (%a1)
	nop
	move.l	#0xFC0B800C, %a2
	move.l	#(CFG_SDRAM_CFG2), (%a2)
	nop

	move.l	#0xFC0B8000, %a1	/* Mode */
	move.l	#0xFC0B8004, %a2	/* Ctrl */

#ifdef CONFIG_M54455EVB
	/* Issue PALL */
	move.l	#(CFG_SDRAM_CTRL + 2), (%a2)
	nop

	/* Issue LEMR */
	move.l	#(CFG_SDRAM_EMOD + 0x408), (%a1)
	nop
	move.l	#(CFG_SDRAM_MODE + 0x300), (%a1)
	nop

	move.l	#1000, %d0
wait1000:
	nop
	subq.l	#1, %d0
	bne	wait1000
#endif

	/* Issue PALL */
	move.l	#(CFG_SDRAM_CTRL + 2), (%a2)
	nop

	/* Perform two refresh cycles */
	move.l	#(CFG_SDRAM_CTRL + 4), %d0
	nop
	move.l	%d0, (%a2)
	move.l	%d0, (%a2)
	nop

#ifdef CONFIG_M54455EVB
	move.l	#(CFG_SDRAM_MODE + 0x200), (%a1)
	nop
#elif defined(CONFIG_M54451EVB)
	/* Issue LEMR */
	move.l	#(CFG_SDRAM_MODE), (%a2)
	nop
	move.l	#(CFG_SDRAM_EMOD), (%a2)
	nop
#endif

	move.l	#500, %d0
wait500:
	nop
	subq.l	#1, %d0
	bne	wait500

	move.l	#(CFG_SDRAM_CTRL), %d0
	and.l	#0x7FFFFFFF, %d0
#ifdef CONFIG_M54455EVB
	or.l	#0x10000c00, %d0
#elif defined(CONFIG_M54451EVB)
	or.l	#0x10000000, %d0
#endif
	move.l	%d0, (%a2)
	nop

	/*
	 * DSPI Initialization
	 * a0 - general, sram - 0x80008000 - 32, see M54455EVB.h
	 * a1 - dspi status
	 * a2 - dtfr
	 * a3 - drfr
	 * a4 - Dst addr
	 */
	/* Enable pins for DSPI mode - chip-selects are enabled later */
	move.l	#0xFC0A4063, %a0
	move.b	#0x7F, (%a0)

	/* Configure DSPI module */
	move.l	#0xFC05C000, %a0
	move.l	#0x80FF0C00, (%a0)	/* Master, clear TX/RX FIFO */

	move.l	#0xFC05C00C, %a0
	move.l	#0x3E000011, (%a0)

	move.l	#0xFC05C034, %a2	/* dtfr */
	move.l	#0xFC05C03B, %a3	/* drfr */

	move.l	#(ASM_SBF_IMG_HDR + 4), %a1
	move.l	(%a1)+, %d5
	move.l	(%a1), %a4

	move.l	#(CFG_INIT_RAM_ADDR + CFG_SBFHDR_DATA_OFFSET), %a0
	move.l	#(CFG_SBFHDR_SIZE), %d4

	move.l	#0xFC05C02C, %a1	/* dspi status */

	/* Issue commands and address */
	move.l	#0x8002000B, %d2	/* Fast Read Cmd */
	jsr	asm_dspi_wr_status
	jsr	asm_dspi_rd_status

	move.l	#0x80020000, %d2	/* Address byte 2 */
	jsr	asm_dspi_wr_status
	jsr	asm_dspi_rd_status

	move.l	#0x80020000, %d2	/* Address byte 1 */
	jsr	asm_dspi_wr_status
	jsr	asm_dspi_rd_status

	move.l	#0x80020000, %d2	/* Address byte 0 */
	jsr	asm_dspi_wr_status
	jsr	asm_dspi_rd_status

	move.l	#0x80020000, %d2	/* Dummy Wr and Rd */
	jsr	asm_dspi_wr_status
	jsr	asm_dspi_rd_status