1 /* SPDX-License-Identifier: GPL-2.0+ */ 2 /* 3 * Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved. 4 */ 5 6 #include <asm-offsets.h> 7 #include <config.h> 8 #include <linux/linkage.h> 9 #include <asm/arcregs.h> 10 11 ENTRY(_start) 12 /* Setup interrupt vector base that matches "__text_start" */ 13 sr __ivt_start, [ARC_AUX_INTR_VEC_BASE] 14 15 ; Disable/enable I-cache according to configuration 16 lr r5, [ARC_BCR_IC_BUILD] 17 breq r5, 0, 1f ; I$ doesn't exist 18 lr r5, [ARC_AUX_IC_CTRL] 19 #ifndef CONFIG_SYS_ICACHE_OFF 20 bclr r5, r5, 0 ; 0 - Enable, 1 is Disable 21 #else 22 bset r5, r5, 0 ; I$ exists, but is not used 23 #endif 24 sr r5, [ARC_AUX_IC_CTRL] 25 26 mov r5, 1 27 sr r5, [ARC_AUX_IC_IVIC] 28 ; As per ARC HS databook (see chapter 5.3.3.2) 29 ; it is required to add 3 NOPs after each write to IC_IVIC. 30 nop 31 nop 32 nop 33 34 1: 35 ; Disable/enable D-cache according to configuration 36 lr r5, [ARC_BCR_DC_BUILD] 37 breq r5, 0, 1f ; D$ doesn't exist 38 lr r5, [ARC_AUX_DC_CTRL] 39 bclr r5, r5, 6 ; Invalidate (discard w/o wback) 40 #ifndef CONFIG_SYS_DCACHE_OFF 41 bclr r5, r5, 0 ; Enable (+Inv) 42 #else 43 bset r5, r5, 0 ; Disable (+Inv) 44 #endif 45 sr r5, [ARC_AUX_DC_CTRL] 46 47 mov r5, 1 48 sr r5, [ARC_AUX_DC_IVDC] 49 50 51 1: 52 #ifdef CONFIG_ISA_ARCV2 53 ; Disable System-Level Cache (SLC) 54 lr r5, [ARC_BCR_SLC] 55 breq r5, 0, 1f ; SLC doesn't exist 56 lr r5, [ARC_AUX_SLC_CTRL] 57 bclr r5, r5, 6 ; Invalidate (discard w/o wback) 58 bclr r5, r5, 0 ; Enable (+Inv) 59 sr r5, [ARC_AUX_SLC_CTRL] 60 61 1: 62 #endif 63 64 /* Establish C runtime stack and frame */ 65 mov %sp, CONFIG_SYS_INIT_SP_ADDR 66 mov %fp, %sp 67 68 /* Allocate reserved area from current top of stack */ 69 mov %r0, %sp 70 bl board_init_f_alloc_reserve 71 /* Set stack below reserved area, adjust frame pointer accordingly */ 72 mov %sp, %r0 73 mov %fp, %sp 74 75 /* Initialize reserved area - note: r0 already contains address */ 76 bl board_init_f_init_reserve 77 78 #ifdef CONFIG_DEBUG_UART 79 /* Earliest point to set up early debug uart */ 80 bl debug_uart_init 81 #endif 82 83 /* Zero the one and only argument of "board_init_f" */ 84 mov_s %r0, 0 85 bl board_init_f 86 87 /* We only get here if relocation is disabled by GD_FLG_SKIP_RELOC */ 88 /* Make sure we don't lose GD overwritten by zero new GD */ 89 mov %r0, %r25 90 mov %r1, 0 91 bl board_init_r 92 ENDPROC(_start) 93 94 /* 95 * void board_init_f_r_trampoline(stack-pointer address) 96 * 97 * This "function" does not return, instead it continues in RAM 98 * after relocating the monitor code. 99 * 100 * r0 = new stack-pointer 101 */ 102 ENTRY(board_init_f_r_trampoline) 103 /* Set up the stack- and frame-pointers */ 104 mov %sp, %r0 105 mov %fp, %sp 106 107 /* Update position of intterupt vector table */ 108 lr %r0, [ARC_AUX_INTR_VEC_BASE] 109 ld %r1, [%r25, GD_RELOC_OFF] 110 add %r0, %r0, %r1 111 sr %r0, [ARC_AUX_INTR_VEC_BASE] 112 113 /* Re-enter U-Boot by calling board_init_f_r */ 114 j board_init_f_r 115 ENDPROC(board_init_f_r_trampoline) 116
