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u-boot/arch/m68k/cpu/mcf5227x/start.S
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style 
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

494 lines
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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright (C) 2003 Josef Baumgartner <josef.baumgartner@telex.de>
* Based on code from Bernhard Kuhn <bkuhn@metrowerks.com>
*/
#include <asm-offsets.h>
#include <config.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_CF_SBF)
#define ASM_DRAMINIT (asm_dram_init - CONFIG_SYS_TEXT_BASE + \
CONFIG_SYS_INIT_RAM_ADDR)
#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_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_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_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 0x00020000 /* image length */
.long CONFIG_SYS_TEXT_BASE /* image to be relocated at */
asm_dram_init:
move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_RAM_CTRL), %d0
movec %d0, %RAMBAR1 /* init Rambar */
move.l #(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_SP_OFFSET), %sp
clr.l %sp@-
/* 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)
/*
* Dram Initialization
* a1, a2, and d0
*/
move.l #0xFC0A4074, %a1
move.b #(CONFIG_SYS_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 #(CONFIG_SYS_SDRAM_SIZE), %d2
#ifdef CONFIG_SYS_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 #(CONFIG_SYS_SDRAM_BASE), (%a1)
or.l %d1, (%a1)
#ifdef CONFIG_SYS_SDRAM_BASE1
move.l #(CONFIG_SYS_SDRAM_BASE1), (%a2)
or.l %d1, (%a2)
#endif
nop
/* dram cfg1 and cfg2 */
move.l #0xFC0B8008, %a1
move.l #(CONFIG_SYS_SDRAM_CFG1), (%a1)
nop
move.l #0xFC0B800C, %a2
move.l #(CONFIG_SYS_SDRAM_CFG2), (%a2)
nop
move.l #0xFC0B8000, %a1 /* Mode */
move.l #0xFC0B8004, %a2 /* Ctrl */
/* Issue PALL */
move.l #(CONFIG_SYS_SDRAM_CTRL + 2), (%a2)
nop
/* Issue LEMR */
move.l #(CONFIG_SYS_SDRAM_MODE), (%a1)
nop
move.l #(CONFIG_SYS_SDRAM_EMOD), (%a1)
nop
move.l #1000, %d0
wait1000:
nop
subq.l #1, %d0
bne wait1000
/* Issue PALL */
move.l #(CONFIG_SYS_SDRAM_CTRL + 2), (%a2)
nop
/* Perform two refresh cycles */
move.l #(CONFIG_SYS_SDRAM_CTRL + 4), %d0
nop
move.l %d0, (%a2)
move.l %d0, (%a2)
nop
move.l #(CONFIG_SYS_SDRAM_CTRL), %d0
and.l #0x7FFFFFFF, %d0
or.l #0x10000c00, %d0
move.l %d0, (%a2)
nop
/*
* DSPI Initialization
* a0 - general, sram - 0x80008000 - 32, see M52277EVB.h
* a1 - dspi status
* a2 - dtfr
* a3 - drfr
* a4 - Dst addr
*/
/* Enable pins for DSPI mode - chip-selects are enabled later */
move.l #0xFC0A4036, %a0
move.b #0x3F, %d0
move.b %d0, (%a0)
/* DSPI CS */
#ifdef CONFIG_SYS_DSPI_CS0
move.b (%a0), %d0
or.l #0xC0, %d0
move.b %d0, (%a0)
#endif
#ifdef CONFIG_SYS_DSPI_CS2
move.l #0xFC0A4037, %a0
move.b (%a0), %d0
or.l #0x10, %d0
move.b %d0, (%a0)
#endif
nop
/* 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 #(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 #0x8004000B, %d2 /* Fast Read Cmd */
jsr asm_dspi_wr_status
jsr asm_dspi_rd_status
move.l #0x80040000, %d2 /* Address byte 2 */
jsr asm_dspi_wr_status
jsr asm_dspi_rd_status
move.l #0x80040000, %d2 /* Address byte 1 */
jsr asm_dspi_wr_status
jsr asm_dspi_rd_status
move.l #0x80040000, %d2 /* Address byte 0 */
jsr asm_dspi_wr_status
jsr asm_dspi_rd_status
move.l #0x80040000, %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 #0x80040000, %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 #0x80040000, %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 #0x00040000, %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
move.l %a0, (%a1)
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 */
.text
. = 0x400
.globl _start
_start:
nop
nop
move.w #0x2700,%sr /* Mask off Interrupt */
/* Set vector base register at the beginning of the Flash */
#if defined(CONFIG_CF_SBF)
move.l #CONFIG_SYS_TEXT_BASE, %d0
movec %d0, %VBR
#else
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
#endif
/* invalidate and disable cache */
move.l #CF_CACR_CINV, %d0 /* Invalidate cache cmd */
movec %d0, %CACR /* Invalidate cache */
move.l #0, %d0
movec %d0, %ACR0
movec %d0, %ACR1
/* initialize general use internal ram */
move.l #0, %d0
move.l #(ICACHE_STATUS), %a1 /* icache */
move.l #(DCACHE_STATUS), %a2 /* icache */
move.l %d0, (%a1)
move.l %d0, (%a2)
/* 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)
bsr board_init_f_alloc_reserve
/* update stack and frame-pointers */
move.l %d0, %sp
move.l %sp, %fp
/* initialize reserved area */
move.l %d0, -(%sp)
bsr board_init_f_init_reserve
/* run low-level CPU init code (from flash) */
bsr cpu_init_f
clr.l %sp@-
/* run low-level board init code (from flash) */
bsr board_init_f
/* 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
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