1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * (C) Copyright 2010,2011 4 * Vladimir Khusainov, Emcraft Systems, vlad@emcraft.com 5 * 6 * (C) Copyright 2015 7 * Kamil Lulko, <kamil.lulko@gmail.com> 8 */ 9 10 #include <common.h> 11 #include <asm/io.h> 12 #include <asm/armv7m.h> 13 14 /* 15 * This is called right before passing control to 16 * the Linux kernel point. 17 */ 18 int cleanup_before_linux(void) 19 { 20 /* 21 * this function is called just before we call linux 22 * it prepares the processor for linux 23 * 24 * disable interrupt and turn off caches etc ... 25 */ 26 disable_interrupts(); 27 /* 28 * turn off D-cache 29 * dcache_disable() in turn flushes the d-cache 30 * MPU is still enabled & can't be disabled as the u-boot 31 * code might be running in sdram which by default is not 32 * executable area. 33 */ 34 dcache_disable(); 35 /* invalidate to make sure no cache line gets dirty between 36 * dcache flushing and disabling dcache */ 37 invalidate_dcache_all(); 38 39 icache_disable(); 40 invalidate_icache_all(); 41 42 return 0; 43 } 44 45 /* 46 * Perform the low-level reset. 47 */ 48 void reset_cpu(ulong addr) 49 { 50 /* 51 * Perform reset but keep priority group unchanged. 52 */ 53 writel((V7M_AIRCR_VECTKEY << V7M_AIRCR_VECTKEY_SHIFT) 54 | (V7M_SCB->aircr & V7M_AIRCR_PRIGROUP_MSK) 55 | V7M_AIRCR_SYSRESET, &V7M_SCB->aircr); 56 } 57