2 * Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved.
4 * SPDX-License-Identifier: GPL-2.0+
7 #include <asm-offsets.h>
9 #include <linux/linkage.h>
10 #include <asm/arcregs.h>
13 /* Setup interrupt vector base that matches "__text_start" */
14 sr __ivt_start, [ARC_AUX_INTR_VEC_BASE]
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
23 bset r5, r5, 0 ; I$ exists, but is not used
25 sr r5, [ARC_AUX_IC_CTRL]
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.
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)
44 bset r5, r5, 0 ; Disable (+Inv)
46 sr r5, [ARC_AUX_DC_CTRL]
49 sr r5, [ARC_AUX_DC_IVDC]
53 #ifdef CONFIG_ISA_ARCV2
54 ; Disable System-Level Cache (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]
65 /* Establish C runtime stack and frame */
66 mov %sp, CONFIG_SYS_INIT_SP_ADDR
69 /* Allocate reserved area from current top of stack */
71 bl board_init_f_alloc_reserve
72 /* Set stack below reserved area, adjust frame pointer accordingly */
76 /* Initialize reserved area - note: r0 already contains address */
77 bl board_init_f_init_reserve
79 /* Zero the one and only argument of "board_init_f" */
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 */
91 * void board_init_f_r_trampoline(stack-pointer address)
93 * This "function" does not return, instead it continues in RAM
94 * after relocating the monitor code.
96 * r0 = new stack-pointer
98 ENTRY(board_init_f_r_trampoline)
99 /* Set up the stack- and frame-pointers */
103 /* Update position of intterupt vector table */
104 lr %r0, [ARC_AUX_INTR_VEC_BASE]
105 ld %r1, [%r25, GD_RELOC_OFF]
107 sr %r0, [ARC_AUX_INTR_VEC_BASE]
109 /* Re-enter U-Boot by calling board_init_f_r */
111 ENDPROC(board_init_f_r_trampoline)