1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * armboot - Startup Code for ARM1176 CPU-core
5 * Copyright (c) 2007 Samsung Electronics
8 * Guennadi Liakhovetki, DENX Software Engineering, <lg@denx.de>
10 * 2007-09-21 - Restructured codes by jsgood (jsgood.yang@samsung.com)
11 * 2007-09-21 - Added MoviNAND and OneNAND boot codes by
12 * jsgood (jsgood.yang@samsung.com)
13 * Base codes by scsuh (sc.suh)
16 #include <asm-offsets.h>
18 #include <linux/linkage.h>
21 *************************************************************************
23 * Startup Code (reset vector)
25 * do important init only if we don't start from memory!
26 * setup Memory and board specific bits prior to relocation.
27 * relocate armboot to ram
30 *************************************************************************
36 /* Allow the board to save important registers */
38 .globl save_boot_params_ret
42 * set the cpu to SVC32 mode
50 *************************************************************************
52 * CPU_init_critical registers
54 * setup important registers
57 *************************************************************************
60 * we do sys-critical inits only at reboot,
61 * not when booting from ram!
65 * When booting from NAND - it has definitely been a reset, so, no need
66 * to flush caches and disable the MMU
68 #ifndef CONFIG_SPL_BUILD
73 mcr p15, 0, r0, c7, c7, 0 /* flush v3/v4 cache */
74 mcr p15, 0, r0, c8, c7, 0 /* flush v4 TLB */
77 * disable MMU stuff and caches
79 mrc p15, 0, r0, c1, c0, 0
80 bic r0, r0, #0x00002300 @ clear bits 13, 9:8 (--V- --RS)
81 bic r0, r0, #0x00000087 @ clear bits 7, 2:0 (B--- -CAM)
82 orr r0, r0, #0x00000002 @ set bit 1 (A) Align
83 orr r0, r0, #0x00001000 @ set bit 12 (I) I-Cache
85 /* Prepare to disable the MMU */
86 adr r2, mmu_disable_phys
87 sub r2, r2, #(CFG_SYS_UBOOT_BASE - CONFIG_TEXT_BASE)
91 /* Run in a single cache-line */
93 mcr p15, 0, r0, c1, c0, 0
102 * Go setup Memory and board specific bits prior to relocation.
104 bl lowlevel_init /* go setup pll,mux,memory */
108 /*------------------------------------------------------------------------------*/
110 .globl c_runtime_cpu_setup
115 WEAK(save_boot_params)
116 b save_boot_params_ret /* back to my caller */
117 ENDPROC(save_boot_params)