1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * (C) Copyright 2008 Texas Insturments
4  *
5  * (C) Copyright 2002
6  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
7  * Marius Groeger <mgroeger@sysgo.de>
8  *
9  * (C) Copyright 2002
10  * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
11  */
12 
13 /*
14  * CPU specific code
15  */
16 
17 #include <command.h>
18 #include <cpu_func.h>
19 #include <irq_func.h>
20 #include <asm/system.h>
21 #include <asm/cache.h>
22 #include <asm/armv7.h>
23 #include <linux/compiler.h>
24 
cpu_cache_initialization(void)25 void __weak cpu_cache_initialization(void){}
26 
cleanup_before_linux_select(int flags)27 int cleanup_before_linux_select(int flags)
28 {
29 	/*
30 	 * this function is called just before we call linux
31 	 * it prepares the processor for linux
32 	 *
33 	 * we turn off caches etc ...
34 	 */
35 #ifndef CONFIG_XPL_BUILD
36 	disable_interrupts();
37 #endif
38 
39 	if (flags & CBL_DISABLE_CACHES) {
40 		/*
41 		* turn off D-cache
42 		* dcache_disable() in turn flushes the d-cache and disables MMU
43 		*/
44 		dcache_disable();
45 		v7_outer_cache_disable();
46 
47 		/*
48 		* After D-cache is flushed and before it is disabled there may
49 		* be some new valid entries brought into the cache. We are
50 		* sure that these lines are not dirty and will not affect our
51 		* execution. (because unwinding the call-stack and setting a
52 		* bit in CP15 SCTRL is all we did during this. We have not
53 		* pushed anything on to the stack. Neither have we affected
54 		* any static data) So just invalidate the entire d-cache again
55 		* to avoid coherency problems for kernel
56 		*/
57 		invalidate_dcache_all();
58 
59 		icache_disable();
60 		invalidate_icache_all();
61 	} else {
62 		/*
63 		 * Turn off I-cache and invalidate it
64 		 */
65 		icache_disable();
66 		invalidate_icache_all();
67 
68 		flush_dcache_all();
69 		invalidate_icache_all();
70 		icache_enable();
71 	}
72 
73 	/*
74 	 * Some CPU need more cache attention before starting the kernel.
75 	 */
76 	cpu_cache_initialization();
77 
78 	return 0;
79 }
80 
cleanup_before_linux(void)81 int cleanup_before_linux(void)
82 {
83 	return cleanup_before_linux_select(CBL_ALL);
84 }
85 
allow_unaligned(void)86 void allow_unaligned(void)
87 {
88 	v7_arch_cp15_allow_unaligned();
89 }
90