1/* 2 * Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved. 3 * 4 * SPDX-License-Identifier: GPL-2.0+ 5 */ 6 7#include <asm-offsets.h> 8#include <config.h> 9#include <linux/linkage.h> 10#include <asm/arcregs.h> 11 12ENTRY(_start) 13 /* Setup interrupt vector base that matches "__text_start" */ 14 sr __ivt_start, [ARC_AUX_INTR_VEC_BASE] 15 16 ; Disable/enable I-cache according to configuration 17 lr r5, [ARC_BCR_IC_BUILD] 18 breq r5, 0, 1f ; I$ doesn't exist 19 lr r5, [ARC_AUX_IC_CTRL] 20#ifndef CONFIG_SYS_ICACHE_OFF 21 bclr r5, r5, 0 ; 0 - Enable, 1 is Disable 22#else 23 bset r5, r5, 0 ; I$ exists, but is not used 24#endif 25 sr r5, [ARC_AUX_IC_CTRL] 26 27 mov r5, 1 28 sr r5, [ARC_AUX_IC_IVIC] 29 ; As per ARC HS databook (see chapter 5.3.3.2) 30 ; it is required to add 3 NOPs after each write to IC_IVIC. 31 nop 32 nop 33 nop 34 351: 36 ; Disable/enable D-cache according to configuration 37 lr r5, [ARC_BCR_DC_BUILD] 38 breq r5, 0, 1f ; D$ doesn't exist 39 lr r5, [ARC_AUX_DC_CTRL] 40 bclr r5, r5, 6 ; Invalidate (discard w/o wback) 41#ifndef CONFIG_SYS_DCACHE_OFF 42 bclr r5, r5, 0 ; Enable (+Inv) 43#else 44 bset r5, r5, 0 ; Disable (+Inv) 45#endif 46 sr r5, [ARC_AUX_DC_CTRL] 47 48 mov r5, 1 49 sr r5, [ARC_AUX_DC_IVDC] 50 51 521: 53#ifdef CONFIG_ISA_ARCV2 54 ; Disable System-Level Cache (SLC) 55 lr r5, [ARC_BCR_SLC] 56 breq r5, 0, 1f ; SLC doesn't exist 57 lr r5, [ARC_AUX_SLC_CTRL] 58 bclr r5, r5, 6 ; Invalidate (discard w/o wback) 59 bclr r5, r5, 0 ; Enable (+Inv) 60 sr r5, [ARC_AUX_SLC_CTRL] 61 621: 63#endif 64 65 /* Establish C runtime stack and frame */ 66 mov %sp, CONFIG_SYS_INIT_SP_ADDR 67 mov %fp, %sp 68 69 /* Allocate reserved area from current top of stack */ 70 mov %r0, %sp 71 bl board_init_f_alloc_reserve 72 /* Set stack below reserved area, adjust frame pointer accordingly */ 73 mov %sp, %r0 74 mov %fp, %sp 75 76 /* Initialize reserved area - note: r0 already contains address */ 77 bl board_init_f_init_reserve 78 79 /* Zero the one and only argument of "board_init_f" */ 80 mov_s %r0, 0 81 bl board_init_f 82 83 /* We only get here if relocation is disabled by GD_FLG_SKIP_RELOC */ 84 /* Make sure we don't lose GD overwritten by zero new GD */ 85 mov %r0, %r25 86 mov %r1, 0 87 bl board_init_r 88ENDPROC(_start) 89 90/* 91 * void board_init_f_r_trampoline(stack-pointer address) 92 * 93 * This "function" does not return, instead it continues in RAM 94 * after relocating the monitor code. 95 * 96 * r0 = new stack-pointer 97 */ 98ENTRY(board_init_f_r_trampoline) 99 /* Set up the stack- and frame-pointers */ 100 mov %sp, %r0 101 mov %fp, %sp 102 103 /* Update position of intterupt vector table */ 104 lr %r0, [ARC_AUX_INTR_VEC_BASE] 105 ld %r1, [%r25, GD_RELOC_OFF] 106 add %r0, %r0, %r1 107 sr %r0, [ARC_AUX_INTR_VEC_BASE] 108 109 /* Re-enter U-Boot by calling board_init_f_r */ 110 j board_init_f_r 111ENDPROC(board_init_f_r_trampoline) 112