Tom Rini | 10e4779 | 2018-05-06 17:58:06 -0400 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0+ |
rev13@wp.pl | b3b57e8 | 2015-03-01 12:44:39 +0100 | [diff] [blame] | 2 | /* |
| 3 | * (C) Copyright 2010,2011 |
| 4 | * Vladimir Khusainov, Emcraft Systems, vlad@emcraft.com |
| 5 | * |
| 6 | * (C) Copyright 2015 |
Kamil Lulko | decd33b | 2015-11-29 11:50:53 +0100 | [diff] [blame] | 7 | * Kamil Lulko, <kamil.lulko@gmail.com> |
rev13@wp.pl | b3b57e8 | 2015-03-01 12:44:39 +0100 | [diff] [blame] | 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 | { |
Vikas Manocha | cd9b3bd | 2017-05-03 15:48:26 -0700 | [diff] [blame] | 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 | |
Patrice Chotard | bedc158 | 2018-03-30 09:22:40 +0200 | [diff] [blame] | 39 | icache_disable(); |
| 40 | invalidate_icache_all(); |
| 41 | |
rev13@wp.pl | b3b57e8 | 2015-03-01 12:44:39 +0100 | [diff] [blame] | 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 | } |