xref: /openbmc/u-boot/arch/m68k/cpu/mcf5445x/start.S (revision 83d290c56fab2d38cd1ab4c4cc7099559c1d5046)

/* SPDX-License-Identifier: GPL-2.0+ */
/*
 * Copyright (C) 2003	Josef Baumgartner <josef.baumgartner@telex.de>
 * Based on code from Bernhard Kuhn <bkuhn@metrowerks.com>
 *
 * Copyright 2010-2012 Freescale Semiconductor, Inc.
 * TsiChung Liew (Tsi-Chung.Liew@freescale.com)
 */

#include <common.h>
#include <asm-offsets.h>
#include <config.h>
#include <timestamp.h>
#include "version.h"
#include <asm/cache.h>

#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_SERIAL_BOOT)
#define ASM_DRAMINIT	(asm_dram_init - CONFIG_SYS_TEXT_BASE + \
	CONFIG_SYS_INIT_RAM_ADDR)
#define ASM_DRAMINIT_N	(asm_dram_init - CONFIG_SYS_TEXT_BASE)
#define ASM_SBF_IMG_HDR	(asm_sbf_img_hdr - CONFIG_SYS_TEXT_BASE + \
	CONFIG_SYS_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_SERIAL_BOOT)

INITSP:	.long	0			/* Initial SP	*/
#ifdef CONFIG_CF_SBF
INITPC:	.long	ASM_DRAMINIT		/* Initial PC 	*/
#endif
#ifdef CONFIG_SYS_NAND_BOOT
INITPC:	.long	ASM_DRAMINIT_N		/* Initial PC 	*/
#endif

#else

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

#endif

vector02_0F:
.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT
.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT

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

vector18_1F:
.long	_FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT, _FAULT

#if !defined(CONFIG_SERIAL_BOOT)

/* 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_SERIAL_BOOT)
	/* Image header: chksum 4 bytes, len 4 bytes, img dest 4 bytes */
asm_sbf_img_hdr:
	.long	0x00000000		/* checksum, not yet implemented */
	.long	0x00040000		/* image length */
	.long	CONFIG_SYS_TEXT_BASE	/* image to be relocated at */

asm_dram_init:
	move.w	#0x2700,%sr		/* Mask off Interrupt */

#ifdef CONFIG_SYS_NAND_BOOT
	/* for assembly stack */
	move.l	#(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_CTRL), %d0
	movec	%d0, %RAMBAR1

	move.l	#(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_SP_OFFSET), %sp
	clr.l	%sp@-
#endif

#ifdef CONFIG_CF_SBF
	move.l	#CONFIG_SYS_INIT_RAM_ADDR, %d0
	movec	%d0, %VBR

	move.l	#(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_CTRL), %d0
	movec	%d0, %RAMBAR1

	/* initialize general use internal ram */
	move.l	#0, %d0
	move.l	#(ICACHE_STATUS), %a1	/* icache */
	move.l	#(DCACHE_STATUS), %a2	/* dcache */
	move.l	%d0, (%a1)
	move.l	%d0, (%a2)

	/* invalidate and disable cache */
	move.l	#(CONFIG_SYS_ICACHE_INV + CONFIG_SYS_DCACHE_INV), %d0
	movec	%d0, %CACR		/* Invalidate cache */
	move.l	#0, %d0
	movec	%d0, %ACR0
	movec	%d0, %ACR1
	movec	%d0, %ACR2
	movec	%d0, %ACR3

	move.l	#(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_SP_OFFSET), %sp
	clr.l	%sp@-

#ifdef CONFIG_SYS_CS0_BASE
	/* Must disable global address */
	move.l	#0xFC008000, %a1
	move.l	#(CONFIG_SYS_CS0_BASE), (%a1)
	move.l	#0xFC008008, %a1
	move.l	#(CONFIG_SYS_CS0_CTRL), (%a1)
	move.l	#0xFC008004, %a1
	move.l	#(CONFIG_SYS_CS0_MASK), (%a1)
#endif
#endif /* CONFIG_CF_SBF */

#ifdef CONFIG_MCF5441x
	/* TC: enable all peripherals,
	in the future only enable certain peripherals */
	move.l	#0xFC04002D, %a1

#if defined(CONFIG_CF_SBF)
	move.b	#23, (%a1)		/* dspi */
#endif
#endif	/* CONFIG_MCF5441x */

	/* mandatory board level ddr-sdram init,
	 * for both 5441x and 5445x
	 */
	bsr	sbf_dram_init

#ifdef CONFIG_CF_SBF
	/*
	 * 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 */
asm_dspi_init:
#ifdef CONFIG_MCF5441x
	move.l	#0xEC09404E, %a1
	move.l	#0xEC09404F, %a2
	move.b	#0xFF, (%a1)
	move.b	#0x80, (%a2)
#endif

#ifdef CONFIG_MCF5445x
	move.l	#0xFC0A4063, %a0
	move.b	#0x7F, (%a0)
#endif
	/* Configure DSPI module */
	move.l	#0xFC05C000, %a0
	move.l	#0x80FF0C00, (%a0)	/* Master, clear TX/RX FIFO */

	move.l	#0xFC05C00C, %a0
#ifdef CONFIG_MCF5441x
	move.l	#0x3E000016, (%a0)
#endif
#ifdef CONFIG_MCF5445x
	move.l	#0x3E000011, (%a0)
#endif

	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	#(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_SBFHDR_DATA_OFFSET), %a0
	move.l	#(CONFIG_SYS_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

	/* Transfer serial boot header to sram */
asm_dspi_rd_loop1:
	move.l	#0x80020000, %d2
	jsr	asm_dspi_wr_status
	jsr	asm_dspi_rd_status

	move.b	%d1, (%a0)		/* read, copy to dst */

	add.l	#1, %a0			/* inc dst by 1 */
	sub.l	#1, %d4			/* dec cnt by 1 */
	bne	asm_dspi_rd_loop1

	/* Transfer u-boot from serial flash to memory */
asm_dspi_rd_loop2:
	move.l	#0x80020000, %d2
	jsr	asm_dspi_wr_status
	jsr	asm_dspi_rd_status

	move.b	%d1, (%a4)		/* read, copy to dst */

	add.l	#1, %a4			/* inc dst by 1 */
	sub.l	#1, %d5			/* dec cnt by 1 */
	bne	asm_dspi_rd_loop2

	move.l	#0x00020000, %d2	/* Terminate */
	jsr	asm_dspi_wr_status
	jsr	asm_dspi_rd_status

	/* jump to memory and execute */
	move.l	#(CONFIG_SYS_TEXT_BASE + 0x400), %a0
	jmp	(%a0)

asm_dspi_wr_status:
	move.l	(%a1), %d0		/* status */
	and.l	#0x0000F000, %d0
	cmp.l	#0x00003000, %d0
	bgt	asm_dspi_wr_status

	move.l	%d2, (%a2)
	rts

asm_dspi_rd_status:
	move.l	(%a1), %d0		/* status */
	and.l	#0x000000F0, %d0
	lsr.l	#4, %d0
	cmp.l	#0, %d0
	beq	asm_dspi_rd_status

	move.b	(%a3), %d1
	rts
#endif /* CONFIG_CF_SBF */

#ifdef CONFIG_SYS_NAND_BOOT
	/* copy 4 boot pages to dram as soon as possible */
	/* each page is 996 bytes (1056 total with 60 ECC bytes */
	move.l  #0x00000000, %a1	/* src */
	move.l	#CONFIG_SYS_TEXT_BASE, %a2		/* dst */
	move.l	#0x3E0, %d0		/* sz in long */

asm_boot_nand_copy:
	move.l	(%a1)+, (%a2)+
	subq.l	#1, %d0
	bne	asm_boot_nand_copy

	/* jump to memory and execute */
	move.l	#(asm_nand_init), %a0
	jmp	(%a0)

asm_nand_init:
	/* exit nand boot-mode */
	move.l	#0xFC0FFF30, %a1
	or.l	#0x00000040, %d1
	move.l	%d1, (%a1)

	/* initialize general use internal ram */
	move.l	#0, %d0
	move.l	#(CACR_STATUS), %a1	/* CACR */
	move.l	#(ICACHE_STATUS), %a2	/* icache */
	move.l	#(DCACHE_STATUS), %a3	/* dcache */
	move.l	%d0, (%a1)
	move.l	%d0, (%a2)
	move.l	%d0, (%a3)

	/* invalidate and disable cache */
	move.l	#0x01004100, %d0	/* Invalidate cache cmd */
	movec	%d0, %CACR		/* Invalidate cache */
	move.l	#0, %d0
	movec	%d0, %ACR0
	movec	%d0, %ACR1
	movec	%d0, %ACR2
	movec	%d0, %ACR3

#ifdef CONFIG_SYS_CS0_BASE
	/* Must disable global address */
	move.l	#0xFC008000, %a1
	move.l	#(CONFIG_SYS_CS0_BASE), (%a1)
	move.l	#0xFC008008, %a1
	move.l	#(CONFIG_SYS_CS0_CTRL), (%a1)
	move.l	#0xFC008004, %a1
	move.l	#(CONFIG_SYS_CS0_MASK), (%a1)
#endif

	/* NAND port configuration */
	move.l	#0xEC094048, %a1
	move.b	#0xFD, (%a1)+
	move.b	#0x5F, (%a1)+
	move.b	#0x04, (%a1)+

	/* reset nand */
	move.l  #0xFC0FFF38, %a1	/* isr */
	move.l  #0x000e0000, (%a1)
	move.l	#0xFC0FFF08, %a2
	move.l	#0x00000000, (%a2)+	/* car */
	move.l	#0x11000000, (%a2)+	/* rar */
	move.l	#0x00000000, (%a2)+	/* rpt */
	move.l	#0x00000000, (%a2)+	/* rai */
	move.l  #0xFC0FFF2c, %a2	/* cfg */
	move.l  #0x00000000, (%a2)+	/* secsz */
	move.l  #0x000e0681, (%a2)+
	move.l  #0xFC0FFF04, %a2	/* cmd2 */
	move.l  #0xFF404001, (%a2)
	move.l  #0x000e0000, (%a1)

	move.l	#0x2000, %d1
	bsr	asm_delay

	/* setup nand */
	move.l  #0xFC0FFF00, %a1
	move.l  #0x30700000, (%a1)+	/* cmd1 */
	move.l  #0x007EF000, (%a1)+	/* cmd2 */

	move.l  #0xFC0FFF2C, %a1
	move.l  #0x00000841, (%a1)+	/* secsz */
	move.l  #0x000e0681, (%a1)+	/* cfg */

	move.l	#100, %d4		/* 100 pages ~200KB */
	move.l	#4, %d2			/* start at 4 */
	move.l  #0xFC0FFF04, %a0	/* cmd2 */
	move.l  #0xFC0FFF0C, %a1	/* rar */
	move.l	#(CONFIG_SYS_TEXT_BASE + 0xF80), %a2

asm_nand_read:
	move.l	#0x11000000, %d0	/* rar */
	or.l	%d2, %d0
	move.l	%d0, (%a1)
	add.l	#1, %d2

	move.l	(%a0), %d0		/* cmd2 */
	or.l	#1, %d0
	move.l	%d0, (%a0)

	move.l	#0x200, %d1
	bsr	asm_delay

asm_nand_chk_status:
	move.l  #0xFC0FFF38, %a4	/* isr */
	move.l	(%a4), %d0
	and.l	#0x40000000, %d0
	tst.l	%d0
	beq	asm_nand_chk_status

	move.l  #0xFC0FFF38, %a4	/* isr */
	move.l	(%a4), %d0
	or.l	#0x000E0000, %d0
	move.l	%d0, (%a4)

	move.l	#0x200, %d3
	move.l	#0xFC0FC000, %a3	/* buf 1 */
asm_nand_copy:
	move.l	(%a3)+, (%a2)+
	subq.l	#1, %d3
	bgt	asm_nand_copy

	subq.l	#1, %d4
	bgt	asm_nand_read

	/* jump to memory and execute */
	move.l	#(CONFIG_SYS_TEXT_BASE + 0x400), %a0
	jmp	(%a0)

#endif			/* CONFIG_SYS_NAND_BOOT */

.globl asm_delay
asm_delay:
	nop
	subq.l	#1, %d1
	bne	asm_delay
	rts
#endif			/* CONFIG_CF_SBF || CONFIG_NAND_U_BOOT */

.text
	. = 0x400
.globl _start
_start:
#if !defined(CONFIG_SERIAL_BOOT)
	nop
	nop
	move.w	#0x2700,%sr		/* Mask off Interrupt */

	/* Set vector base register at the beginning of the Flash */
	move.l	#CONFIG_SYS_FLASH_BASE, %d0
	movec	%d0, %VBR

	move.l	#(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_CTRL), %d0
	movec	%d0, %RAMBAR1

	/* initialize general use internal ram */
	move.l	#0, %d0
	move.l	#(ICACHE_STATUS), %a1	/* icache */
	move.l	#(DCACHE_STATUS), %a2	/* dcache */
	move.l	%d0, (%a1)
	move.l	%d0, (%a2)

	/* invalidate and disable cache */
	move.l	#(CONFIG_SYS_ICACHE_INV + CONFIG_SYS_DCACHE_INV), %d0
	movec	%d0, %CACR		/* Invalidate cache */
	move.l	#0, %d0
	movec	%d0, %ACR0
	movec	%d0, %ACR1
	movec	%d0, %ACR2
	movec	%d0, %ACR3
#else
	move.l	#(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_CTRL), %d0
	movec	%d0, %RAMBAR1
#endif

	/* put relocation table address to a5 */
	move.l	#__got_start, %a5

	/* setup stack initially on top of internal static ram  */
	move.l	#(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_SIZE), %sp

	/*
	 * if configured, malloc_f arena will be reserved first,
	 * then (and always) gd struct space will be reserved
	 */
	move.l	%sp, -(%sp)
	move.l	#board_init_f_alloc_reserve, %a1
	jsr	(%a1)

	/* update stack and frame-pointers */
	move.l	%d0, %sp
	move.l	%sp, %fp

	/* initialize reserved area */
	move.l	%d0, -(%sp)
	move.l	#board_init_f_init_reserve, %a1
	jsr	(%a1)

	/* run low-level CPU init code (from flash) */
	move.l	#cpu_init_f, %a1
	jsr	(%a1)

	/* run low-level board init code (from flash) */
	clr.l   %sp@-
	move.l	#board_init_f, %a1
	jsr	(%a1)

	/* board_init_f() does not return */

/******************************************************************************/

/*
 * void relocate_code (addr_sp, gd, addr_moni)
 *
 * This "function" does not return, instead it continues in RAM
 * after relocating the monitor code.
 *
 * r3 = dest
 * r4 = src
 * r5 = length in bytes
 * r6 = cachelinesize
 */
.globl relocate_code
relocate_code:
	link.w	%a6,#0
	move.l	8(%a6), %sp		/* set new stack pointer */

	move.l	12(%a6), %d0		/* Save copy of Global Data pointer */
	move.l	16(%a6), %a0		/* Save copy of Destination Address */

	move.l	#CONFIG_SYS_MONITOR_BASE, %a1
	move.l	#__init_end, %a2
	move.l	%a0, %a3

	/* copy the code to RAM */
1:
	move.l	(%a1)+, (%a3)+
	cmp.l	%a1,%a2
	bgt.s	1b

/*
 * We are done. Do not return, instead branch to second part of board
 * initialization, now running from RAM.
 */
	move.l	%a0, %a1
	add.l	#(in_ram - CONFIG_SYS_MONITOR_BASE), %a1
	jmp	(%a1)

in_ram:

clear_bss:
	/*
	 * Now clear BSS segment
	 */
	move.l	%a0, %a1
	add.l	#(_sbss - CONFIG_SYS_MONITOR_BASE),%a1
	move.l	%a0, %d1
	add.l	#(_ebss - CONFIG_SYS_MONITOR_BASE),%d1
6:
	clr.l	(%a1)+
	cmp.l	%a1,%d1
	bgt.s	6b

	/*
	 * fix got table in RAM
	 */
	move.l	%a0, %a1
	add.l	#(__got_start - CONFIG_SYS_MONITOR_BASE),%a1
	move.l	%a1,%a5			/* fix got pointer register a5 */

	move.l	%a0, %a2
	add.l	#(__got_end - CONFIG_SYS_MONITOR_BASE),%a2

7:
	move.l	(%a1),%d1
	sub.l	#_start,%d1
	add.l	%a0,%d1
	move.l	%d1,(%a1)+
	cmp.l	%a2, %a1
	bne	7b

	/* calculate relative jump to board_init_r in ram */
	move.l	%a0, %a1
	add.l	#(board_init_r - CONFIG_SYS_MONITOR_BASE), %a1

	/* set parameters for board_init_r */
	move.l	%a0,-(%sp)		/* dest_addr */
	move.l	%d0,-(%sp)		/* gd */
	jsr	(%a1)

/******************************************************************************/

/* exception code */
.globl _fault
_fault:
	bra	_fault

.globl _exc_handler
_exc_handler:
	SAVE_ALL
	movel	%sp,%sp@-
	bsr	exc_handler
	addql	#4,%sp
	RESTORE_ALL

.globl _int_handler
_int_handler:
	SAVE_ALL
	movel	%sp,%sp@-
	bsr	int_handler
	addql	#4,%sp
	RESTORE_ALL

/******************************************************************************/

.globl version_string
version_string:
.ascii U_BOOT_VERSION_STRING, "\0"
.align 4